Patent Publication Number: US-2023138624-A1

Title: Image capturing optical system, imaging apparatus and electronic device

Description:
RELATED APPLICATIONS 
     This application is a continuation of U.S. application Ser. No. 17/572,950, filed Jan. 11, 2022, which is a continuation of U.S. application Ser. No. 16/731,212, filed Dec. 31, 2019, U.S. Pat. No. 11,256,069 issued on Feb. 22, 2022, which is a continuation of U.S. application Ser. No. 16/384,036, filed Apr. 15, 2019, U.S. Pat. No. 10,564,403 issued on Feb. 18, 2020, which is a continuation of U.S. application Ser. No. 15/691,928, filed Aug. 31, 2017, U.S. Pat. No. 10,310,227 issued on Jun. 4, 2019, which claims priority to Taiwan Application Serial Number 106105479, filed Feb. 18, 2017, which are herein incorporated by reference. 
    
    
     BACKGROUND 
     Technical Field 
     The present disclosure relates to an image capturing optical system and an imaging apparatus. More particularly, the present disclosure relates to an image capturing optical system and an imaging apparatus with a compact size applicable to electronic devices. 
     Description of Related Art 
     With the wider application of photographing modules, installing photographing modules in various smart electronic devices, portables, mobile devices, recognition devices, entertainment systems, sporting devices and smart home assisting systems is becoming a major trend in developments for future technology, especially portables with high image quality by popular demand. In order to obtain more extensive experiences in utilizations, smart devices with one, two or more than three lens assemblies are becoming the market mainstream, and various photographing modules with different features are developed in response to different demands. 
     In order to obtain high resolution, the lens design of conventional compact lens assemblies often has a limited range of the light entry into the lens assemblies, so that the image would be too dark to identify in night or low light indoor settings due to overly short exposure time, or the image would be blurred due to overly long exposure time as well as lens shakes. Most photographing lens assemblies with higher amount of incident light on the market are for digital single-lens reflex cameras (DSLR), which have a higher price tag, excessive size and are difficult to carry, so that conventional optical systems cannot satisfy the current trend of the technological developments. 
     SUMMARY 
     According to one aspect of the present disclosure, an image capturing optical system includes seven lens elements, the seven lens elements being, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element. Each of the seven lens elements has an object-side surface towards the object side and an image-side surface towards the image side. An image-side surface of the fifth lens element is convex in a paraxial region thereof. An image-side surface of the sixth lens element is concave in a paraxial region thereof. The seventh lens element has negative refractive power. Each of at least three of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element has at least one surface being aspheric, and at least one surface of at least one of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element includes at least one inflection point. When an axial distance between an object-side surface of the first lens element and an image surface is TL, an entrance pupil diameter of the image capturing optical system is EPD, a focal length of the first lens element is f1, a focal length of the third lens element is f3, a curvature radius of an object-side surface of the third lens element is R5, a curvature radius of an image-side surface of the third lens element is R6, a curvature radius of an object-side surface of the seventh lens element is R13, and a curvature radius of an image-side surface of the seventh lens element is R14, the following conditions are satisfied: 
       1.05&lt; TL/EPD&lt; 2.38; 
       −1.50&lt; f 3/ f 1&lt;1.55;
 
       −0.70&lt; R 14/ R 13&lt;1.40; and
 
       | R 5/ R 6|&lt;4.50. 
     According to one aspect of the present disclosure, an image capturing optical system includes seven lens elements, the seven lens elements being, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element. Each of the seven lens elements has an object-side surface towards the object side and an image-side surface towards the image side. The second lens element has negative refractive power. The fifth lens element has positive refractive power. An image-side surface of the sixth lens element is concave in a paraxial region thereof. The seventh lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof. Each of at least three of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element has at least one surface being aspheric, and at least one surface of at least one of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element includes at least one inflection point. When an axial distance between an object-side surface of the first lens element and an image surface is TL, an entrance pupil diameter of the image capturing optical system is EPD, a focal length of the first lens element is f1, and a focal length of the third lens element is f3, the following conditions are satisfied: 
       1.05&lt; TL/EPD&lt; 2.38; and 
       −7.0&lt; f 3/ f 1&lt;1.55.
 
     According to another aspect of the present disclosure, an imaging apparatus includes the image capturing optical system of the aforementioned aspect, a driving apparatus and an image sensor, wherein the driving apparatus is connected to the image capturing optical system, the image sensor is disposed on an image surface of the image capturing optical system. 
     According to another aspect of the present disclosure, an electronic device includes the imaging apparatus of the aforementioned aspect. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The present disclosure can be more fully understood by reading the following detailed description of the embodiment, with reference made to the accompanying drawings as follows: 
         FIG.  1    is a schematic view of an imaging apparatus according to the 1st embodiment of the present disclosure; 
         FIG.  2    shows spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 1st embodiment; 
         FIG.  3    is a schematic view of an imaging apparatus according to the 2nd embodiment of the present disclosure; 
         FIG.  4    shows spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 2nd embodiment; 
         FIG.  5    is a schematic view of an imaging apparatus according to the 3rd embodiment of the present disclosure; 
         FIG.  6    shows spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 3rd embodiment; 
         FIG.  7    is a schematic view of an imaging apparatus according to the 4th embodiment of the present disclosure; 
         FIG.  8    shows spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 4th embodiment; 
         FIG.  9    is a schematic view of an imaging apparatus according to the 5th embodiment of the present disclosure; 
         FIG.  10    shows spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 5th embodiment; 
         FIG.  11    is a schematic view of an imaging apparatus according to the 6th embodiment of the present disclosure; 
         FIG.  12    shows spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 6th embodiment; 
         FIG.  13    is a schematic view of an imaging apparatus according to the 7th embodiment of the present disclosure; 
         FIG.  14    shows spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 7th embodiment; 
         FIG.  15    is a schematic view of an imaging apparatus according to the 8th embodiment of the present disclosure; 
         FIG.  16    shows spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 8th embodiment; 
         FIG.  17    is a schematic view of an imaging apparatus according to the 9th embodiment of the present disclosure; 
         FIG.  18    shows spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 9th embodiment; 
         FIG.  19    is a schematic view of an imaging apparatus according to the 10th embodiment of the present disclosure; 
         FIG.  20    shows spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 10th embodiment; 
         FIG.  21    is a schematic view of an imaging apparatus according to the 11th embodiment of the present disclosure; 
         FIG.  22    shows spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 11th embodiment; 
         FIG.  23    is a schematic view of an imaging apparatus according to the 12th embodiment of the present disclosure; 
         FIG.  24    shows spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 12th embodiment; 
         FIG.  25    is a schematic view of a parameter Yc62 of the image capturing optical system of  FIG.  1   ; 
         FIG.  26    is a schematic view of a parameter Yc72 of the image capturing optical system of  FIG.  1   ; 
         FIG.  27    is a three-dimensional schematic view of an imaging apparatus according to the 13th embodiment of the present disclosure; 
         FIG.  28 A  is a schematic view of one side of an electronic device according to the 14th embodiment of the present disclosure; 
         FIG.  28 B  is a schematic view of another side of the electronic device of  FIG.  28 A ; 
         FIG.  28 C  is a system schematic view of the electronic device of  FIG.  28 A ; 
         FIG.  29    is a schematic view of an electronic device according to the 15th embodiment of the present disclosure; and 
         FIG.  30    is a schematic view of an electronic device according to the 16th embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     An image capturing optical system includes seven lens elements, the seven lens elements being, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element, wherein each of the seven lens elements has an object-side surface towards the object side and an image-side surface towards the image side. 
     One surface of the first lens element can be concave in a paraxial region thereof, and the other surface of the first lens element can be convex in a paraxial region thereof; that is, the first lens element can be meniscus in a paraxial region thereof. Therefore, it is favorable for the light convergence in tangential and sagittal directions by controlling the shape and strength of the refractive power of the first lens element, so that the astigmatism of the image capturing optical system can be corrected. 
     The second lens element can have negative refractive power, so that aberrations generated from the first lens element can be balanced, and chromatic aberration of the image capturing optical system can be corrected, so as to avoid the image overlapping caused by different image locations of different color lights captured by the electronic device. 
     The third lens element can have positive refractive power, so that it is favorable for providing the light converging ability on the object side of the image capturing optical system so as to reduce the total track length and stay compact. 
     The fifth lens element can have positive refractive power, so that it is favorable for providing the converging ability on the image side of the image capturing optical system so as to allow enlarged field of view for expanding utilizations. The fifth lens element can have an image-side surface being convex in a paraxial region thereof, so that the symmetry of the image capturing optical system can be enhanced for avoiding excessive aberrations. 
     The sixth lens element has an image-side surface being concave in a paraxial region thereof. Therefore, it is favorable for controlling the back focal length along with the seventh lens element, so to avoid the size of the image capturing optical system being too large and hard to reduce. 
     The seventh lens element with negative refractive power can have an image-side surface being concave in a paraxial region thereof, so that the back focal length of the image capturing optical system can be controlled effectively so as to allow installation in a compact electronic device. Furthermore, the image-side surface of the seventh lens element can include at least one convex shape, so that it is favorable for correcting the Petzval field, moderating distortion, avoiding vignetting in an off-axial region of the image and correcting off-axial aberrations. 
     Each of at least three of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element has at least one surface being aspheric. Therefore, it is favorable for the configuration of the lens elements of the entire image capturing optical system so as to satisfy the demands of better balance between aberrations and shorter total track length. 
     At least one surface of at least one of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element includes at least one inflection point. Therefore, it is favorable for correcting off-axial aberrations and reducing the total track length so as to satisfy the demand for compact devices. 
     When an axial distance between an object-side surface of the first lens element and an image surface is TL, and an entrance pupil diameter of the image capturing optical system is EPD, the following condition is satisfied: 1.05&lt;TL/EPD&lt;2.38. Therefore, it is favorable for controlling the ratio of the incident light range and the total track length of the image capturing optical system so as to allow sufficient light on the image sensor while obtaining high image brightness and a compact optical system. Preferably, the following condition can be satisfied: 1.10&lt;TL/EPD&lt;2.20. More preferably, the following condition can be satisfied: 1.15&lt;TL/EPD&lt;2.0. Further, the following condition can be satisfied: 1.20&lt;TL/EPD&lt;1.90. 
     When a focal length of the first lens element is f1, and a focal length of the third lens element is f3, the following condition is satisfied: −7.0&lt;f3/f1&lt;1.55. Therefore, it is favorable for correcting the refractive powers of the first lens element and the third lens element so as to enhance the system controlling ability of the third lens element for a wider adaptation in different applications. Preferably, the following condition can be satisfied: −1.50&lt;f3/f1&lt;1.55. More preferably, the following condition can be satisfied: −0.80&lt;f3/f1&lt;1.55. Further, the following condition can be satisfied: 0&lt;f3/f1&lt;1.45. Moreover, the following condition can be satisfied: 0.50&lt;f3/f1&lt;1.35. 
     When a curvature radius of an object-side surface of the seventh lens element is R13, and a curvature radius of the image-side surface of the seventh lens element is R14, the following condition is satisfied: −0.70&lt;R14/R13&lt;1.40. Therefore, it is favorable for obtaining sufficient curvature of the image-side surface of the seventh lens element so as to obtain the compact size of the image capturing optical system by controlling the back focal length thereof. Preferably, the following condition can be satisfied: −0.50&lt;R14/R13&lt;1.0. 
     When a curvature radius of an object-side surface of the third lens element is R5, and a curvature radius of an image-side surface of the third lens element is R6, the following condition is satisfied: |R5/R6|&lt;4.50. Therefore, it is favorable for enhancing the controlling ability of the object-side surface of the third lens element and the ability of aberration correction of the image-side surface of the third lens element so as to obtain better image quality. Preferably, the following condition can be satisfied: |R5/R6|&lt;2.50. 
     When a focal length of the image capturing optical system is f, and the entrance pupil diameter of the image capturing optical system is EPD, the following condition is satisfied: 0.75&lt;f/EPD&lt;1.65. Therefore, it is favorable for improving the light absorption of the image capturing optical system so as to obtain a clearer captured image. Preferably, the following condition can be satisfied: 0.85&lt;f/EPD&lt;1.55. More preferably, the following condition can be satisfied: 0.90&lt;f/EPD&lt;1.50. Further, the following condition can be satisfied: 0.95&lt;f/EPD&lt;1.45. Moreover, the following condition can be satisfied: 0.95&lt;f/EPD&lt;1.35. Furthermore, the following condition can be satisfied: 0.95&lt;f/EPD &lt;1.30. Furthermore, the following condition can be satisfied: 0.95&lt;f/EPD &lt;1.25. 
     When a curvature radius of the object-side surface of the first lens element is R1, and the curvature radius of the image-side surface of the third lens element is R6, the following condition is satisfied: R1/R6&lt;0.25. Therefore, it is favorable for enhancing the surface curvature strength of the object-side surface of the first lens element and moderating the curvature of the image-side surface of the third lens element so as to improve aberration corrections and reduce the generation of the stray light. Preferably, the following condition can be satisfied: −8.0&lt;R1/R6&lt;0.25. More preferably, the following condition can be satisfied: −0.50&lt;R1/R6&lt;0.25. 
     When the axial distance between the object-side surface of the first lens element and the image surface is TL, a focal length of the image capturing optical system is f, the entrance pupil diameter of the image capturing optical system is EPD, and a maximum image height of the image capturing optical system is ImgH, the following condition is satisfied: (TL×f)/(EPD×ImgH)&lt;2.50. Therefore, it is favorable for effectively balancing optical properties of the image capturing optical system so as to obtain compactness and a sufficient light absorbing area, thus the image can be brighter and clearer. Preferably, the following condition can be satisfied: (TL×f)/(EPD×ImgH)&lt;2.35. 
     Each of at least two of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element, the sixth lens element and the seventh lens element has an Abbe number which is smaller than 25.0. Therefore, chromatic aberration of the image capturing optical system can be corrected, and the material characteristics of the lens elements can be controlled effectively, so that the density difference between each lens element and air can be increased so as to enhance the refractive power of the lens element. Thus, the effect of the light deflection can be maintained in smaller space with more moderate curvature of lens elements so as to reduce the total track length. 
     When the focal length of the image capturing optical system is f, and a focal length of the second lens element is f2, the following condition is satisfied: 0.40&lt;|f/f2|&lt;1.20. Therefore, it is favorable for configuring the strength of the refractive power of the second lens element so as to avoid insufficient light path control ability caused by refractive power of the second lens element being too small or the stray light from excessive refractive power. 
     When a maximum of chief ray angles of the image capturing optical system is CRAmax, the following condition is satisfied: 35.0 degrees&lt;CRAmax&lt;50.0 degrees. Therefore, it is favorable for increasing the image brightness by enlarging light absorbing areas of the image in limited space. 
     When a vertical distance between a non-axial critical point on the image-side surface of the sixth lens element and an optical axis is Yc62, and a vertical distance between a non-axial critical point on the image-side surface of the seventh lens element and the optical axis is Yc72, the following condition is satisfied: 0.50&lt;Yc72/Yc62&lt;1.85. Therefore, it is favorable for improving aberration corrections in the off-axial region of the image capturing optical system so as to avoid the deformation or insufficient brightness of the off-axial image. 
     When the curvature radius of the object-side surface of the first lens element is R1, and a curvature radius of an image-side surface of the second lens element is R4, the following condition is satisfied: −1.50&lt;R4/R1&lt;3.0. Therefore, it is favorable for controlling the surface shape of the lens elements on the object side of the image capturing optical system, so that the combined configuration of the first lens element and the second lens element can be enhanced which is complementary, thus aberrations can be corrected and the image quality can be improved. 
     When a curvature radius of an object-side surface of the second lens element is R3, and an axial distance between the object-side surface of the first lens element and the image-side surface of the seventh lens element is TD, the following condition is satisfied: −0.70&lt;R3/TD&lt;0.80. Therefore, it is favorable for arranging the light path of the image capturing optical system by improving the shape variation of the object-side surface of the second lens element. 
     When an axial distance between the first lens element and the second lens element is T12, an axial distance between the second lens element and the third lens element is T23, an axial distance between the third lens element and the fourth lens element is T34, an axial distance between the fourth lens element and the fifth lens element is T45, an axial distance between the fifth lens element and the sixth lens element is T56, and an axial distance between the sixth lens element and the seventh lens element is T67, the following condition is satisfied: 7.50&lt;(T23+T34+T45+T67)/(T12+T56)&lt;45.0. Therefore, it is favorable for effectively balancing the space arrangement so as to obtain preferable space utilization efficiency. 
     The image capturing optical system can further include an aperture stop located on an object side of the second lens element, wherein when an axial distance between the aperture stop and the image-side surface of the seventh lens element is SD, and the axial distance between the object-side surface of the first lens element and the image-side surface of the seventh lens element is TD, the following condition is satisfied: 0.80&lt;SD/TD&lt;0.98. Therefore, it is favorable for balancing the field of view and the total track length by controlling the position of the aperture stop so as to obtain compactness of the electronic device and improved utility. 
     When the curvature radius of the image-side surface of the seventh lens element is R14, and the entrance pupil diameter of the image capturing optical system is EPD, the following condition is satisfied: 0.10&lt;R14/EPD&lt;1.0. Therefore, it is favorable for reducing the total track length of the image capturing optical system by effectively controlling the back focal length thereof and avoiding vignetting by obtaining sufficient light in to the image capturing optical system so as to enhance image quality. 
     When the axial distance between the object-side surface of the first lens element and the image surface is TL, the following condition is satisfied: TL&lt;7.5 mm. Therefore, it is favorable for the compactness of the image capturing optical system by effectively controlling the total track length thereof. 
     When a vertical distance between a non-axial critical point on the image-side surface of the seventh lens element and the optical axis is Yc72, and the focal length of the image capturing optical system is f, the following condition is satisfied: 0.10&lt;Yc72/f&lt;0.85. Therefore, it is favorable for controlling the angle of the off-axial light, correcting off-axial aberrations, and maintaining sufficient image height and image capturing range. 
     When the focal length of the first lens element is f1, and a focal length of the fourth lens element is f4, the following condition is satisfied: −0.30&lt;f1/f4&lt;0.30. Therefore, it is favorable for controlling refractive power of the first lens element in the image capturing optical system and optimizing aberration corrections of the fourth lens element so as to reduce the total track length and enhance the image quality. 
     When the axial distance between the second lens element and the third lens element is T23, and a central thickness of the second lens element is CT2, the following condition is satisfied: 0.40&lt;T23/CT2&lt;1.60. Therefore, the spacing between the second lens element and the third lens element is favorable for lens assembling, and it is also favorable for avoiding the second lens element being too thin, which may affect lens assembly strength and yield rate of the product, and for avoiding the second lens element being too thick, which may affect the molding uniformity of the lens element. 
     When the axial distance between the sixth lens element and the seventh lens element is T67, and a central thickness of the sixth lens element is CT6, the following condition is satisfied: 0.70&lt;T67/CT6&lt;5.50. Therefore, it is favorable for balancing the thickness of the sixth lens element and obtaining sufficient space between the sixth lens element and the seventh lens element which is for moderating the light path, so that excessive aberrations can be avoided with enhanced stability. 
     When the axial distance between the object-side surface of the first lens element and the image surface is TL, and a maximum image height of the image capturing optical system is ImgH, the following condition is satisfied: TL/ImgH&lt;2.0. Therefore, it is favorable for obtaining the compactness and sufficient light absorbing range so as to enhance the image brightness and the image quality. 
     When the half of a maximum field of view of the image capturing optical system is HFOV, the following condition is satisfied: 0.70&lt;tan(HFOV)&lt;1.20. Therefore, it is favorable for controlling the image capturing range of the image capturing optical system so as to satisfy wider application demands. 
     Moreover, the image capturing optical system of the present disclosure can include the aforementioned seven lens elements while optionally including other elements, such as cover glasses, filters, fixing elements, light blocking sheets, image sensors, etc., and will not be limited thereto. 
     Each of the aforementioned features of the image capturing optical system can be utilized in numerous combinations, so as to achieve the corresponding effects. 
     According to the image capturing optical system of the present disclosure, the lens elements thereof can be made of glass or plastic materials. When the lens elements are made of plastic materials, manufacturing costs can be effectively reduced. When the lens elements are made of glass materials, the distribution of the refractive power of the image capturing optical system may be more flexible to design. Furthermore, surfaces of each lens element can be arranged to be aspheric, since the aspheric surface of the lens element is easy to form a shape other than a spherical surface so as to have more controllable variables for eliminating aberrations thereof, and to further decrease the required amount of lens elements in the image capturing lens system. Therefore, the total track length of the image capturing optical system can also be reduced. 
     According to the image capturing optical system of the present disclosure, each of an object-side surface and an image-side surface has a paraxial region and an off-axial region. The paraxial region refers to the region of the surface where light rays travel close to an optical axis, and the off-axial region refers to the region of the surface away from the paraxial region. Particularly unless otherwise stated, when the lens element has a convex surface, it indicates that the surface can be convex in the paraxial region thereof; when the lens element has a concave surface, it indicates that the surface can be concave in the paraxial region thereof. According to the image capturing optical system of the present disclosure, the refractive power or the focal length of a lens element being positive or negative may refer to the refractive power or the focal length in a paraxial region of the lens element. 
     According to the image capturing optical system of the present disclosure, the image capturing optical system can include at least one stop, such as an aperture stop, a glare stop or a field stop. Said glare stop or said field stop is for eliminating the stray light and thereby improving the image resolution thereof. 
     According to the image capturing optical system of the present disclosure, the image surface of the image capturing optical system, based on the corresponding image sensor, can be flat or curved. In particular, the image surface can be a concave curved surface facing towards the object side. 
     According to the image capturing optical system of the present disclosure, an aperture stop can be configured as a front stop or a middle stop. A front stop disposed between an object and the first lens element can provide a longer distance between an exit pupil of the image capturing optical system and the image surface, and thereby obtains a telecentric effect and improves the image-sensing efficiency of the image sensor, such as CCD or CMOS. A middle stop disposed between the first lens element and the image surface is favorable for enlarging the field of view of the image capturing optical system and thereby provides a wider field of view for the same. 
     According to the image capturing optical system of the present disclosure, a critical point is a non-axial point of the lens surface where its tangent is perpendicular to the optical axis, wherein a convex critical point is a critical point located on a convex shape of the lens surface, and the shape of the critical point (convex or concave) is determined by the positive or negative sign of the curvature at the critical point. 
     According to the image capturing optical system of the present disclosure, the image capturing lens system can be applied to 3D (three-dimensional) image capturing applications, in products such as digital cameras, mobile devices, digital tablets, smart TVs, surveillance systems, motion sensing input devices, driving recording systems, rearview camera systems, and wearable devices. 
     According to the present disclosure, an imaging apparatus is provided. The imaging apparatus includes the aforementioned image capturing optical system, a driving apparatus and an image sensor, wherein the driving apparatus is connected to the image capturing optical system, and the image sensor is disposed on the image side of the aforementioned image capturing optical system, that is, the image sensor can be disposed on or near the image surface of the aforementioned image capturing optical system. It is favorable for effectively reducing the back focal length of the image capturing optical system by the surface shapes of the sixth lens element and the seventh lens element, and the refractive power of the seventh lens element. Preferably, the imaging apparatus can further include a barrel member, a holder member or a combination thereof. 
     According to the present disclosure, an electronic device is provided, which includes the aforementioned image capturing apparatus. Preferably, the electronic device can further include but not limited to a control unit, a display, a storage unit, a random access memory unit (RAM) or a combination thereof. 
     According to the above description of the present disclosure, the following 1st-16th specific embodiments are provided for further explanation. 
     1st Embodiment 
       FIG.  1    is a schematic view of an imaging apparatus according to the 1st embodiment of the present disclosure.  FIG.  2    shows spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 1st embodiment. In  FIG.  1   , the imaging apparatus includes an image capturing optical system (its reference numeral is omitted) and an image sensor  195 . The image capturing optical system includes, in order from an object side to an image side, an aperture stop  100 , a first lens element  110 , a second lens element  120 , a third lens element  130 , a stop  101 , a fourth lens element  140 , a fifth lens element  150 , a sixth lens element  160 , a seventh lens element  170 , a filter  180  and an image surface  190 , wherein the image sensor  195  is disposed on the image surface  190  of the image capturing optical system. The image capturing optical system includes seven lens elements ( 110 ,  120 ,  130 ,  140 ,  150 ,  160  and  170 ) without additional one or more lens elements inserted between the first lens element  110  and the seventh lens element  170 , and each of the seven lens elements has an object-side surface towards the object side and an image-side surface towards the image side. 
     The first lens element  110  with positive refractive power has an object-side surface  111  being convex in a paraxial region thereof and an image-side surface  112  being concave in a paraxial region thereof. The first lens element  110  is made of a plastic material, and has the object-side surface  111  and the image-side surface  112  being both aspheric. Furthermore, the image-side surface  112  of the first lens element  110  includes at least one inflection point. 
     The second lens element  120  with negative refractive power has an object-side surface  121  being convex in a paraxial region thereof and an image-side surface  122  being concave in a paraxial region thereof. The second lens element  120  is made of plastic material, and has the object-side surface  121  and the image-side surface  122  being both aspheric. Furthermore, each of the object-side surface  121  and the image-side surface  122  of the second lens element  120  includes at least one inflection point. 
     The third lens element  130  with positive refractive power has an object-side surface  131  being convex in a paraxial region thereof and an image-side surface  132  being convex in a paraxial region thereof. The third lens element  130  is made of plastic material, and has the object-side surface  131  and the image-side surface  132  being both aspheric. 
     The fourth lens element  140  with negative refractive power has an object-side surface  141  being concave in a paraxial region thereof and an image-side surface  142  being convex in a paraxial region thereof. The fourth lens element  140  is made of plastic material, and has the object-side surface  141  and the image-side surface  142  being both aspheric. 
     The fifth lens element  150  with positive refractive power has an object-side surface  151  being convex in a paraxial region thereof and an image-side surface  152  being convex in a paraxial region thereof. The fifth lens element  150  is made of plastic material, and has the object-side surface  151  and the image-side surface  152  being both aspheric. Furthermore, each of the object-side surface  151  and the image-side surface  152  of the fifth lens element  150  includes at least one inflection point. 
     The sixth lens element  160  with negative refractive power has an object-side surface  161  being concave in a paraxial region thereof and an image-side surface  162  being concave in a paraxial region thereof. The sixth lens element  160  is made of plastic material, and has the object-side surface  161  and the image-side surface  162  being both aspheric. Furthermore, each of the object-side surface  161  and the image-side surface  162  of the sixth lens element  160  includes at least one inflection point. 
     The seventh lens element  170  with negative refractive power has an object-side surface  171  being concave in a paraxial region thereof and an image-side surface  172  being concave in a paraxial region thereof. The seventh lens element  170  is made of plastic material, and has the object-side surface  171  and the image-side surface  172  being both aspheric. Furthermore, each of the object-side surface  171  and the image-side surface  172  of the seventh lens element  170  includes at least one inflection point. 
     The filter  180  is made of a glass material and located between the seventh lens element  170  and the image surface  190 , and will not affect the focal length of the image capturing optical system. 
     The equation of the aspheric surface profiles of the aforementioned lens elements of the 1st embodiment is expressed as follows: 
     
       
         
           
             
               
                 X 
                 ⁡ 
                 ( 
                 Y 
                 ) 
               
               = 
               
                 
                   
                     ( 
                     
                       
                         Y 
                         2 
                       
                       / 
                       R 
                     
                     ) 
                   
                   / 
                   
                     ( 
                     
                       1 
                       + 
                       
                         sqrt 
                         ⁡ 
                         ( 
                         
                           1 
                           - 
                           
                             
                               ( 
                               
                                 1 
                                 + 
                                 k 
                               
                               ) 
                             
                             × 
                             
                               
                                 ( 
                                 
                                   Y 
                                   / 
                                   R 
                                 
                                 ) 
                               
                               2 
                             
                           
                         
                         ) 
                       
                     
                     ) 
                   
                 
                 + 
                 
                   
                     ∑ 
                     i 
                   
                   
                     
                       ( 
                       Ai 
                       ) 
                     
                     × 
                     
                       ( 
                       
                         Y 
                         i 
                       
                       ) 
                     
                   
                 
               
             
             , 
           
         
       
     
     where, 
     X is the relative distance between a point on the aspheric surface spaced at a distance Y from the optical axis and the tangential plane at the aspheric surface vertex on the optical axis; 
     Y is the vertical distance from the point on the aspheric surface to the optical axis; 
     R is the curvature radius; 
     k is the conic coefficient; and 
     Ai is the i-th aspheric coefficient. 
     In the image capturing optical system according to the 1st embodiment, when a focal length of the image capturing optical system is f, an f-number of the image capturing optical system is Fno, and half of a maximum field of view of the image capturing optical system is HFOV, these parameters have the following values: f=3.91 mm; Fno=1.45; and HFOV=40.1 degrees. 
     In the image capturing optical system according to the 1st embodiment, when an axial distance between the first lens element  110  and the second lens element  120  is T12, an axial distance between the second lens element  120  and the third lens element  130  is T23, an axial distance between the third lens element  130  and the fourth lens element  140  is T34, an axial distance between the fourth lens element  140  and the fifth lens element  150  is T45, an axial distance between the fifth lens element  150  and the sixth lens element  160  is T56, an axial distance between the sixth lens element  160  and the seventh lens element  170  is T67, a central thickness of the second lens element  120  is CT2, and a central thickness of the sixth lens element  160  is CT6, the following conditions are satisfied: T23/CT2=0.98; T67/CT6=1.87; and (T23+T34+T45+T67)/(T12+T56)=11.14. 
     In the image capturing optical system according to the 1st embodiment, when a curvature radius of the object-side surface  111  of the first lens element  110  is R1, a curvature radius of the image-side surface  122  of the second lens element  120  is R4, a curvature radius of the object-side surface  131  of the third lens element  130  is R5, a curvature radius of the image-side surface  132  of the third lens element  130  is R6, a curvature radius of the object-side surface  171  of the seventh lens element  170  is R13, a curvature radius of the image-side surface  172  of the seventh lens element  170  is R14, and an entrance pupil diameter of the image capturing optical system is EPD, the following conditions are satisfied: R1/R6=−0.11; R4/R1=0.62; |R5/R6|=0.16; R14/R13=−0.32; and R14/EPD=0.77. 
     In the image capturing optical system according to the 1st embodiment, when a curvature radius of the object-side surface  121  of the second lens element  120  is R3, and an axial distance between the object-side surface  111  of the first lens element  110  and the image-side surface  172  of the seventh lens element  170  is TD, the following condition is satisfied: R3/TD=0.47. 
     In the image capturing optical system according to the 1st embodiment, when the focal length of the image capturing optical system is f, a focal length of the first lens element  110  is f1, a focal length of the second lens element  120  is f2, a focal length of the third lens element  130  is f3, and a focal length of the fourth lens element  140  is f4, the following conditions are satisfied: If/f21=0.49; f1/f4=−0.01; and f3/f1=0.95. 
     In the image capturing optical system according to the 1st embodiment, when half of a maximum field of view of the image capturing optical system is HFOV, the following condition is satisfied: tan(HFOV)=0.84. 
     In the image capturing optical system according to the 1st embodiment, when the focal length of the image capturing optical system is f, the entrance pupil diameter of the image capturing optical system is EPD, an axial distance between the object-side surface  111  of the first lens element  110  and the image surface  190  is TL, a maximum image height of the image capturing optical system is ImgH (half of a diagonal length of an effective photosensitive area of the image sensor  195 ), the following conditions are satisfied: f/EPD=1.45; TL/EPD=1.87; TL/ImgH=1.48; and TL=5.04 mm. 
     In the image capturing optical system according to the 1st embodiment, when an axial distance between the aperture stop  100  and the image-side surface  172  of the seventh lens element  170  is SD, and an axial distance between the object-side surface  111  of the first lens element  110  and the image-side surface  172  of the seventh lens element  170  is TD, the following condition is satisfied: SD/TD=0.90. 
     In the image capturing optical system according to the 1st embodiment, when a maximum of chief ray angles of the image capturing optical system is CRAmax (that is, a maximum incident angle of a chief ray into the image surface  190 ), the following condition is satisfied: CRAmax=37.39 degrees. 
     In the image capturing optical system according to the 1st embodiment, when the axial distance between the object-side surface  111  of the first lens element  110  and the image surface  190  is TL, the focal length of the image capturing optical system is f, the entrance pupil diameter of the image capturing optical system is EPD, and the maximum image height of the image capturing optical system is ImgH, the following condition is satisfied: (TL×f)/(EPD×ImgH)=2.15. 
       FIG.  25    is a schematic view of a parameter Yc62 of the image capturing optical system of  FIG.  1   .  FIG.  26    is a schematic view of a parameter Yc72 of the image capturing optical system of  FIG.  1   . In  FIG.  25    and  FIG.  26   , when a vertical distance between a non-axial critical point on the image-side surface  162  of the sixth lens element  160  and an optical axis is Yc62, a vertical distance between a non-axial critical point on the image-side surface  172  of the seventh lens element  170  and the optical axis is Yc72, the focal length of the image capturing optical system is f, and the following conditions are satisfied: Yc72/Yc62=1.41; and Yc72/f=0.25. 
     The detailed optical data of the 1st embodiment are shown in Table 1 and the aspheric surface data are shown in Table 2 below. 
     
       
         
           
               
             
               
                 TABLE 1 
               
             
            
               
                   
               
               
                 1st Embodiment 
               
               
                 f = 3.91 mm, Fno = 1.45, HFOV = 40.1 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                   
                 Curvature  
                   
                   
                   
                   
                 Focal  
               
               
                 Surface 
                   
                 Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Length 
               
               
                   
               
               
                  0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                  1 
                 Ape, Stop 
                 Plano 
                 −0.425 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                  2 
                 Lens 1 
                 2.292 
                 ASP 
                 0.518 
                 Plastic 
                 1.545 
                 56.0 
                 5.52 
               
               
                  3 
                   
                 8.900 
                 ASP 
                 0.038 
                   
                   
                   
                   
               
               
                  4 
                 Lens 2 
                 2.043 
                 ASP 
                 0.200 
                 Plastic 
                 1.660 
                 20.4 
                 −8.03 
               
               
                  5 
                   
                 1.417 
                 ASP 
                 0.197 
                   
                   
                   
                   
               
               
                  6 
                 Lens 3 
                 3.273 
                 ASP 
                 0.577 
                 Plastic 
                 1.544 
                 55.9 
                 5.25 
               
               
                  7 
                   
                 −21.010 
                 ASP 
                 0.000 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                  8 
                 Stop 
                 Plano 
                 0.342 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                  9 
                 Lens 4 
                 −11.674 
                 ASP 
                 0.234 
                 Plastic 
                 1.639 
                 23.5 
                 −400.68 
               
               
                 10 
                   
                 −12.328 
                 ASP 
                 0.411 
                   
                   
                   
                   
               
               
                 11 
                 Lens 6 
                 79.917 
                 ASP 
                 0.738 
                 Plastic 
                 1.544 
                 55.9 
                 4.44 
               
               
                 12 
                   
                 −2.481 
                 ASP 
                 0.096 
                   
                   
                   
                   
               
               
                 13 
                 Lens 6 
                 −931.104 
                 ASP 
                 0.286 
                 Plastic 
                 1.660 
                 20.4 
                 −14.43 
               
               
                 14 
                   
                 9.622 
                 ASP 
                 0.535 
                   
                   
                   
                   
               
               
                 15 
                 Lens 7 
                 −6.551 
                 ASP 
                 0.200 
                 Plastic 
                 1.544 
                 55.9 
                 −2.89 
               
               
                 16 
                   
                 2.087 
                 ASP 
                 0.200 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 17 
                 Filter 
                 Plano 
                 0.210 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 18 
                   
                 Plano 
                 0.257 
                   
                   
                   
                   
               
               
                 19 
                 Image 
                 Plano 
                 — 
                   
                   
                   
                   
               
               
                   
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
               
                 Effective radius of Stop on Surface 8 is 1.130 mm. 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 2 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
            
               
                   
                 Surface # 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                 2 
                 3 
                 4 
                 5 
                 6 
                 7 
                 9 
               
               
                   
               
               
                 k = 
                 −3.5854E−01 
                 −5.5110E+00 
                 −4.0650E−01 
                 −6.0886E−01 
                 −6.6255E+00 
                 −5.7411E+01 
                 −6.0793E+00 
               
               
                 A4 = 
                  5.1575E−03 
                  2.1508E−02 
                 −1.2988E−01 
                 −1.5370E−01 
                  2.7520E−02  
                 −3.6842E−02 
                 −1.7133E−01 
               
               
                 A6 = 
                  6.4871E−03 
                  3.6297E−02 
                  1.4636E−01 
                  1.5165E−01 
                  3.1630E−02 
                 −3.8725E−03 
                  4.0713E−02 
               
               
                 A8 = 
                 −1.8683E−02 
                 −1.0640E−01  
                 −2.6864E−01 
                 −2.2093E−01  
                 −6.1695E−02 
                  2.6461E−02 
                 −5.4218E−02 
               
               
                 A10 = 
                  2.5124E−02 
                  1.4610E−01 
                  3.0583E−01 
                  2.4133E−01 
                  8.6184E−02  
                 −4.5138E−02 
                  2.4187E−02 
               
               
                 A12 =  
                 −1.7631E−02  
                 −1.0465E−01  
                 −2.1250E−01 
                 −1.6513E−01 
                 −6.8464E−02 
                  3.8545E−02 
                  3.5417E−02 
               
               
                 A14 = 
                  7.2913E−03 
                  4.1241E−02 
                  7.7923E−02 
                  5.7886E−02 
                  2.8728E−02  
                 −1.4377E−02 
                 −4.2770E−02 
               
               
                 A16 = 
                 −1.3189E−03  
                 −7.4846E−03  
                 −1.2090E−02 
                 −7.6230E−03  
                 −5.0267E−03 
                  1.3712E−03 
                  1.2647E−02 
               
               
                   
               
            
           
           
               
               
            
               
                   
                 Surface # 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                 10 
                 11 
                 12 
                 13 
                 14 
                 15 
                 16 
               
               
                   
               
               
                 k = 
                  6.8287E−16  
                 −4.6232E+01 
                 −1.0249E+01 
                 −3.6614E+01 
                 −5.5111E+00 
                 −8.9973E+01 
                 −1.9377E+01 
               
               
                 A4 = 
                 −1.5923E−01  
                 −5.4638E−02 
                  3.6768E−02 
                  3.2198E−02 
                 −1.3264E−02 
                 −3.1622E−01 
                 −9.7877E−02 
               
               
                 A6 = 
                  3.0777E−02 
                  2.2268E−01 
                 −9.9855E−02 
                 −1.3552E−01  
                 −5.5699E−02 
                  2.8626E−01 
                  4.4170E−02 
               
               
                 A8 = 
                 −3.9133E−02 
                 −9.4218E−01 
                  1.0511E−01 
                  6.1593E−02 
                 −6.6244E−03  
                 −2.6580E−01 
                 −1.3858E−02 
               
               
                 A10 = 
                  2.9677E−02 
                  2.0805E+00 
                 −1.8564E−01 
                 −3.9506E−02 
                  3.3592E−02 
                  1.6749E−01 
                  3.1863E−03 
               
               
                 A12 =  
                  1.1181E−02  
                 −2.9275E+00 
                  2.3025E−01 
                  4.6467E−02 
                 −1.8867E−02 
                 −7.0867E−02 
                 −5.7622E−04 
               
               
                 A14 = 
                 −2.5737E−02 
                  2.6262E+00 
                 −1.6963E−01 
                 −2.9860E−02 
                  4.9872E−03 
                  1.8942E−02 
                  7.6899E−05 
               
               
                 A16 = 
                  1.1199E−02  
                 −1.4550E+00 
                  7.3047E−02 
                  9.3440E−03 
                 −6.9497E−04  
                 −3.0816E−03 
                 −6.7410E−06 
               
               
                 A18 = 
                 −1.3546E−03 
                  4.5350E−01 
                 −1.7228E−02 
                 −1.3890E−03 
                  4.8771E−05 
                  2.7755E−04 
                  3.4469E−07 
               
               
                 A20 = 
                   
                 −6.1259E−02 
                  1.7214E−03 
                  7.8685E−05 
                 −1.3448E−06  
                 −1.0581E−05 
                 −8.2312E−09 
               
               
                   
               
            
           
         
       
     
     In Table 1, the curvature radius, the thickness and the focal length are shown in millimeters (mm). Surface numbers 0-19 represent the surfaces sequentially arranged from the object side to the image side along the optical axis. In Table 2, k represents the conic coefficient of the equation of the aspheric surface profiles. A4-A20 represent the aspheric coefficients ranging from the 4th order to the 20th order. The tables presented below for each embodiment correspond to schematic parameter and aberration curves of each embodiment, and term definitions of the tables are the same as those in Table 1 and Table 2 of the 1st embodiment. Therefore, an explanation in this regard will not be provided again. 
     Furthermore, according to the 1st embodiment, each of at least two of the first lens element  110 , the second lens element  120 , the third lens element  130 , the fourth lens element  140 , the fifth lens element  150 , the sixth lens element  160  and the seventh lens element  170  has an Abbe number smaller than 25.0; in detail, the Abbe numbers of the second lens element  120 , the fourth lens element  140  and the sixth lens element  160  are smaller than 25.0. 
     According to the 1st embodiment, a number of inflection points on each of object-side surfaces and image-side surfaces of the first lens element  110 , the second lens element  120 , the third lens element  130 , the fourth lens element  140 , the fifth lens element  150 , the sixth lens element  160  and the seventh lens element  170  is listed as follows. 
     
       
         
           
               
            
               
                   
               
               
                 1st Embodiment-Numbers of Inflection points 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                 110 
                 120 
                 130 
                 140 
                 150 
                 160 
                 170 
               
               
                   
               
               
                 Object-side surface 
                 0 
                 1 
                 0 
                 0 
                 1 
                 3 
                 1 
               
               
                 Image-side surface 
                 1 
                 1 
                 0 
                 0 
                 1 
                 2 
                 1 
               
               
                   
               
            
           
         
       
     
     2nd Embodiment 
       FIG.  3    is a schematic view of an imaging apparatus according to the 2nd embodiment of the present disclosure.  FIG.  4    shows spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 2nd embodiment. In  FIG.  3   , the imaging apparatus includes an image capturing optical system (its reference numeral is omitted) and an image sensor  295 . The image capturing optical system includes, in order from an object side to an image side, a first lens element  210 , an aperture stop  200 , a second lens element  220 , a third lens element  230 , a stop  201 , a fourth lens element  240 , a fifth lens element  250 , a sixth lens element  260 , a seventh lens element  270 , a filter  280  and an image surface  290 , wherein the image sensor  295  is disposed on the image surface  290  of the image capturing optical system. The image capturing optical system includes seven lens elements ( 210 ,  220 ,  230 ,  240 ,  250 ,  260  and  270 ) without additional one or more lens elements inserted between the first lens element  210  and the seventh lens element  270 , and each of the seven lens elements has an object-side surface towards the object side and an image-side surface towards the image side. 
     The first lens element  210  with positive refractive power has an object-side surface  211  being convex in a paraxial region thereof and an image-side surface  212  being convex in a paraxial region thereof. The first lens element  210  is made of a plastic material, and has the object-side surface  211  and the image-side surface  212  being both aspheric. Furthermore, each of the object-side surface  211  and the image-side surface  212  of the first lens element  210  includes at least one inflection point. 
     The second lens element  220  with negative refractive power has an object-side surface  221  being convex in a paraxial region thereof and an image-side surface  222  being concave in a paraxial region thereof. The second lens element  220  is made of plastic material, and has the object-side surface  221  and the image-side surface  222  being both aspheric. Furthermore, the object-side surface  221  of the second lens element  220  includes at least one inflection point. 
     The third lens element  230  with positive refractive power has an object-side surface  231  being convex in a paraxial region thereof and an image-side surface  232  being convex in a paraxial region thereof. The third lens element  230  is made of plastic material, and has the object-side surface  231  and the image-side surface  232  being both aspheric. Furthermore, the object-side surface  231  of the third lens element  230  includes at least one inflection point. 
     The fourth lens element  240  with positive refractive power has an object-side surface  241  being concave in a paraxial region thereof and an image-side surface  242  being convex in a paraxial region thereof. The fourth lens element  240  is made of plastic material, and has the object-side surface  241  and the image-side surface  242  being both aspheric. 
     The fifth lens element  250  with positive refractive power has an object-side surface  251  being concave in a paraxial region thereof and an image-side surface  252  being convex in a paraxial region thereof. The fifth lens element  250  is made of plastic material, and has the object-side surface  251  and the image-side surface  252  being both aspheric. Furthermore, the image-side surface  252  of the fifth lens element  250  includes at least one inflection point. 
     The sixth lens element  260  with negative refractive power has an object-side surface  261  being convex in a paraxial region thereof and an image-side surface  262  being concave in a paraxial region thereof. The sixth lens element  260  is made of plastic material, and has the object-side surface  261  and the image-side surface  262  being both aspheric. Furthermore, each of the object-side surface  261  and the image-side surface  262  of the sixth lens element  260  includes at least one inflection point. 
     The seventh lens element  270  with negative refractive power has an object-side surface  271  being concave in a paraxial region thereof and an image-side surface  272  being concave in a paraxial region thereof. The seventh lens element  270  is made of plastic material, and has the object-side surface  271  and the image-side surface  272  being both aspheric. Furthermore, each of the object-side surface  271  and the image-side surface  272  of the seventh lens element  270  includes at least one inflection point. 
     The filter  280  is made of a glass material and located between the seventh lens element  270  and the image surface  290 , and will not affect the focal length of the image capturing optical system. 
     The detailed optical data of the 2nd embodiment are shown in Table 3 and the aspheric surface data are shown in Table 4 below. 
     
       
         
           
               
             
               
                 TABLE 3 
               
             
            
               
                   
               
               
                 2nd Embodiment 
               
               
                 f = 3.88 mm, Fno = 1.47, HFOV = 40.1 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                   
                 Curvature  
                   
                   
                   
                   
                 Focal  
               
               
                 Surface # 
                   
                 Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe #  
                 Length 
               
               
                   
               
               
                  0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                  1 
                 Lens 1 
                 2.663 
                 ASP 
                 0.529 
                 Plastic 
                 1.545 
                 56.0 
                 4.71 
               
               
                  2 
                   
                 −66.131 
                 ASP 
                 0.090 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                  3 
                 Ape. Stop 
                 Plano 
                 −0.060 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                  4 
                 Lens 2 
                 2.084 
                 ASP 
                 0.200 
                 Plastic 
                 1.660 
                 20.4 
                 −6.91 
               
               
                  5 
                   
                 1.376 
                 ASP 
                 0.242 
                   
                   
                   
                   
               
               
                  6 
                 Lens 3 
                 3.869 
                 ASP 
                 0.563 
                 Plastic 
                 1.544 
                 55.9 
                 5.77 
               
               
                  7 
                   
                 −15.764 
                 ASP 
                 −0.020 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                  8 
                 Stop 
                 Plano 
                 0.288 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                  9 
                 Lens 4 
                 −49.354 
                 ASP 
                 0.214 
                 Plastic 
                 1.639 
                 23.5 
                 54.16 
               
               
                 10 
                   
                 −20.370 
                 ASP 
                 0.443 
                   
                   
                   
                   
               
               
                 11 
                 Lens 5 
                 −10.833 
                 ASP 
                 0.689 
                 Plastic 
                 1.544 
                 55.9 
                 4.41 
               
               
                 12 
                   
                 −2.006 
                 ASP 
                 0.050 
                   
                   
                   
                   
               
               
                 13 
                 Lens 6 
                 9.514 
                 ASP 
                 0.282 
                 Plastic 
                 1.660 
                 20.4 
                 −10.05 
               
               
                 14 
                   
                 3.862 
                 ASP 
                 0.631 
                   
                   
                   
                   
               
               
                 16 
                 Lens 7 
                 −5.939 
                 ASP 
                 0.200 
                 Plastic 
                 1.544 
                 55.9 
                 −3.00 
               
               
                 16 
                   
                 2.278 
                 ASP 
                 0.150 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 17 
                 Filter 
                 Plano 
                 0.210 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 18 
                   
                 Plano 
                 0.313 
                   
                   
                   
                   
               
               
                 19 
                 Image 
                 Plano 
                 — 
                   
                   
                   
                   
               
               
                   
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 4 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
            
               
                   
                 Surface # 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                 1 
                 2 
                 4 
                 5 
                 6 
                 7 
                 9 
               
               
                   
               
               
                 k = 
                 −9.6159E−01  
                 −5.5110E+00 
                 −4.0000E−01  
                 −6.2328E−01 
                 −6.5882E+00 
                 −5.7411E+01 
                 −6.0793E+00 
               
               
                 A4 = 
                  1.8340E−03 
                  7.7153E−02 
                 −9.1919E−02  
                 −1.6251E−01  
                  2.9884E−02 
                 −4.0991E−02 
                 −1.6246E−01 
               
               
                 A6 = 
                  8.8693E−03 
                 −1.1440E−01 
                  2.3727E−02 
                  1.4421E−01 
                  5.3652E−02 
                 −2.0782E−02 
                  2.2903E−02 
               
               
                 A8 = 
                 −2.8170E−02 
                  1.6655E−01 
                  6.8011E−03 
                 −1.4706E−01 
                 −1.2983E−01 
                  9.0965E−02 
                 −6.9392E−02 
               
               
                 A10 = 
                  4.0939E−02  
                 −1.6166E−01 
                 −4.0637E−02  
                  8.8538E−02 
                  2.2033E−01 
                 −1.5651E−01 
                  1.1604E−01 
               
               
                 A12 = 
                 −3.0138E−02 
                  9.8451E−02 
                  3.6691E−02 
                 −2.8292E−02  
                 −2.1914E−01 
                  1.4645E−01 
                 −7.4473E−02 
               
               
                 A14 = 
                  1.1666E−02  
                 −3.3405E−02 
                 −1.5085E−02  
                  1.8700E−03 
                  1.1466E−01 
                 −7.0915E−02 
                  1.4366E−02 
               
               
                 A16 = 
                 −1.9079E−03 
                  4.5478E−03 
                  2.3794E−03 
                  1.2944E−03 
                 −2.5099E−02 
                  1.3196E−02 
                  2.4529E−03 
               
               
                   
               
            
           
           
               
               
            
               
                   
                 Surface # 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                 10 
                 11 
                 12 
                 13 
                 14 
                 15 
                 16 
               
               
                   
               
               
                 k = 
                  8.2604E−30  
                 −4.6232E+01 
                 −1.0316E+01 
                 −3.6614E+01 
                 −5.5111E+00 
                 −8.9973E+01 
                 −1.9377E+01 
               
               
                 A4 = 
                 −1.3828E−01  
                 −1.4429E−02 
                  1.6315E−01 
                  1.6430E−01 
                 −3.7474E−02 
                 −3.5966E−01 
                 −1.5053E−01 
               
               
                 A6 = 
                 −1.4042E−02 
                  7.6852E−02 
                 −7.3583E−01 
                 −7.6726E−01 
                 −1.1991E−01 
                  2.9494E−01 
                  9.9434E−02 
               
               
                 A8 = 
                  1.6066E−02 
                 −4.9690E−01 
                  1.5715E+00 
                  1.3774E+00 
                  1.1759E−01 
                 −2.3382E−01 
                 −5.3908E−02 
               
               
                 A10 = 
                 −3.5655E−02 
                  1.0983E+00 
                 −2.2872E+00 
                 −1.7436E+00 
                 −5.7717E−02 
                  1.3599E−01 
                  2.2071E−02 
               
               
                 A12 = 
                  9.5200E−02  
                 −1.5180E+00 
                  2.2249E+00 
                  1.5305E+00 
                  1.0877E−02 
                 −4.7345E−02 
                 −6.2353E−03 
               
               
                 A14 = 
                 −1.0104E−01 
                  1.3360E+00 
                 −1.4257E+00 
                 −9.0246E−01  
                  3.3624E−03 
                  8.8603E−03 
                  1.1422E−03 
               
               
                 A16 = 
                  4.7440E−02  
                 −7.3429E−01 
                  5.7559E−01 
                  3.3789E−01 
                 −2.3242E−03  
                 −6.5127E−04 
                 −1.2893E−04 
               
               
                 A18 = 
                 −8.1877E−03 
                  2.3172E−01 
                 −1.3231E−01  
                 −7.2100E−02 
                  4.7756E−04 
                 −2.8236E−05 
                  8.1634E−06 
               
               
                 A20 = 
                   
                 −3.2936E−02 
                  1.3154E−02 
                  6.6327E−03 
                 −3.4650E−05 
                  5.0525E−06 
                 −2.2243E−07 
               
               
                   
               
            
           
         
       
     
     In the 2nd embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 2nd embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from Table 3 and Table 4 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 2nd Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 3.88 
                 f1/f4 
                 0.09 
               
               
                 Fno 
                 1.47 
                 f3/f1 
                 1.22 
               
               
                 HFOV [deg.] 
                 40.1 
                 tan(HFOV) 
                 0.84 
               
               
                 T23/CT2 
                 1.21 
                 f/EPD 
                 1.47 
               
               
                 T67/CT6 
                 2.24 
                 TL/EPD 
                 1.90 
               
               
                 (T23 + T34 + T45 +  
                 19.81 
                 TL/ImgH 
                 1.48 
               
               
                 T67)/(T12 + T56) 
                   
                   
                   
               
               
                 R1/R6 
                 −0.17 
                 TL [mm] 
                 5.01 
               
               
                 R4/R1 
                 0.52 
                 SD/TD 
                 0.86 
               
               
                 |R5/R6| 
                 0.25 
                 CRAmax [deg.] 
                 38.23 
               
               
                 R14/R13 
                 −0.38 
                 (TL × f)/(EPD × ImgH) 
                 2.18 
               
               
                 R14/EPD 
                 0.86 
                 Yc72/Yc62 
                 1.02 
               
               
                 R3/TD 
                 0.48 
                 Yc72/f 
                 0.22 
               
               
                 |f/f2| 
                 0.56 
               
               
                   
               
            
           
         
       
     
     Furthermore, according to the 2nd embodiment, each of at least two of the first lens element  210 , the second lens element  220 , the third lens element  230 , the fourth lens element  240 , the fifth lens element  250 , the sixth lens element  260  and the seventh lens element  270  has an Abbe number which is smaller than 25.0; in detail, the Abbe numbers of the second lens element  220 , the fourth lens element  240  and the sixth lens element  260  are smaller than 25.0. 
     According to the 2nd embodiment, a number of inflection points on each of object-side surfaces and image-side surfaces of the first lens element  210 , the second lens element  220 , the third lens element  230 , the fourth lens element  240 , the fifth lens element  250 , the sixth lens element  260  and the seventh lens element  270  is listed as follows. 
     
       
         
           
               
            
               
                   
               
               
                 2nd Embodiment-Numbers of inflection points 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                 210 
                 220 
                 230 
                 240 
                 250 
                 260 
                 270 
               
               
                   
               
               
                 Object-side surface 
                 1 
                 1 
                 1 
                 0 
                 0 
                 2 
                 1 
               
               
                 Image-side surface 
                 2 
                 0 
                 0 
                 0 
                 1 
                 2 
                 1 
               
               
                   
               
            
           
         
       
     
     3rd Embodiment 
       FIG.  5    is a schematic view of an imaging apparatus according to the 3rd embodiment of the present disclosure.  FIG.  6    shows spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 3rd embodiment. In  FIG.  5   , the imaging apparatus includes an image capturing optical system (its reference numeral is omitted) and an image sensor  395 . The image capturing optical system includes, in order from an object side to an image side, a first lens element  310 , an aperture stop  300 , a second lens element  320 , a third lens element  330 , a stop  301 , a fourth lens element  340 , a fifth lens element  350 , a sixth lens element  360 , a seventh lens element  370 , a filter  380  and an image surface  390 , wherein the image sensor  395  is disposed on the image surface  390  of the image capturing optical system. The image capturing optical system includes seven lens elements ( 310 ,  320 ,  330 ,  340 ,  350 ,  360  and  370 ) without additional one or more lens elements inserted between the first lens element  310  and the seventh lens element  370 , and each of the seven lens elements has an object-side surface towards the object side and an image-side surface towards the image side. 
     The first lens element  310  with positive refractive power has an object-side surface  311  being convex in a paraxial region thereof and an image-side surface  312  being concave in a paraxial region thereof. The first lens element  310  is made of a plastic material, and has the object-side surface  311  and the image-side surface  312  being both aspheric. Furthermore, each of the object-side surface  311  and the image-side surface  312  of the first lens element  310  includes at least one inflection point. 
     The second lens element  320  with negative refractive power has an object-side surface  321  being convex in a paraxial region thereof and an image-side surface  322  being concave in a paraxial region thereof. The second lens element  320  is made of plastic material, and has the object-side surface  321  and the image-side surface  322  being both aspheric. Furthermore, each of the object-side surface  321  and the image-side surface  322  of the second lens element  320  includes at least one inflection point. 
     The third lens element  330  with positive refractive power has an object-side surface  331  being convex in a paraxial region thereof and an image-side surface  332  being concave in a paraxial region thereof. The third lens element  330  is made of plastic material, and has the object-side surface  331  and the image-side surface  332  being both aspheric. Furthermore, the image-side surface  332  of the third lens element  330  includes at least one inflection point. 
     The fourth lens element  340  with positive refractive power has an object-side surface  341  being convex in a paraxial region thereof and an image-side surface  342  being concave in a paraxial region thereof. The fourth lens element  340  is made of plastic material, and has the object-side surface  341  and the image-side surface  342  being both aspheric. Furthermore, each of the object-side surface  341  and the image-side surface  342  of the fourth lens element  340  includes at least one inflection point. 
     The fifth lens element  350  with positive refractive power has an object-side surface  351  being concave in a paraxial region thereof and an image-side surface  352  being convex in a paraxial region thereof. The fifth lens element  350  is made of plastic material, and has the object-side surface  351  and the image-side surface  352  being both aspheric. Furthermore, the image-side surface  352  of the fifth lens element  350  includes at least one inflection point. 
     The sixth lens element  360  with negative refractive power has an object-side surface  361  being convex in a paraxial region thereof and an image-side surface  362  being concave in a paraxial region thereof. The sixth lens element  360  is made of plastic material, and has the object-side surface  361  and the image-side surface  362  being both aspheric. Furthermore, each of the object-side surface  361  and the image-side surface  362  of the sixth lens element  360  includes at least one inflection point. 
     The seventh lens element  370  with negative refractive power has an object-side surface  371  being concave in a paraxial region thereof and an image-side surface  372  being concave in a paraxial region thereof. The seventh lens element  370  is made of plastic material, and has the object-side surface  371  and the image-side surface  372  being both aspheric. Furthermore, each of the object-side surface  371  and the image-side surface  372  of the seventh lens element  370  includes at least one inflection point. 
     The filter  380  is made of a glass material and located between the seventh lens element  370  and the image surface  390 , and will not affect the focal length of the image capturing optical system. 
     The detailed optical data of the 3rd embodiment are shown in Table 5 and the aspheric surface data are shown in Table 6 below. 
     
       
         
           
               
             
               
                 TABLE 5 
               
             
            
               
                   
               
               
                 3rd Embodiment  
               
               
                 f = 3.85 mm, Fno = 1.47, HFOV = 40.0 deg.  
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Sur-  
                   
                   
                   
                   
                   
                   
                   
               
               
                 face  
                   
                 Curvature  
                 Thick-  
                   
                   
                 Abbe  
                 Focal  
               
               
                 # 
                   
                 Radius  
                 ness  
                 Material  
                 Index  
                 # 
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0  
                 Object  
                 Plano  
                 Infinity  
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 1  
                 Lens  
                 2.466  
                 ASP  
                 0.485  
                 Plastic  
                 1.545  
                 56.0  
                 5.63  
               
               
                   
                 1  
                   
                   
                   
                   
                   
                   
                   
               
               
                 2  
                   
                 11.739  
                 ASP  
                 0.055  
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 3  
                 Ape.  
                 Plano  
                 0.035  
                   
                   
                   
                   
               
               
                   
                 Stop  
                   
                   
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 4  
                 Lens  
                 2.463  
                 ASP  
                 0.200  
                 Plastic  
                 1.660  
                 20.4  
                 −7.19  
               
               
                   
                 2  
                   
                   
                   
                   
                   
                   
                   
               
               
                 5  
                   
                 1.569  
                 ASP  
                 0.165  
                   
                   
                   
                   
               
               
                 6  
                 Lens  
                 2.585  
                 ASP  
                 0.570  
                 Plastic  
                 1.544  
                 55.9  
                 5.16  
               
               
                   
                 3  
                   
                   
                   
                   
                   
                   
                   
               
               
                 7  
                   
                 30.477  
                 ASP  
                 0.000  
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 8  
                 Stop  
                 Plano  
                 0.348  
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 9  
                 Lens  
                 19.215  
                 ASP  
                 0.213  
                 Plastic  
                 1.639  
                 23.5  
                 165.73  
               
               
                   
                 4  
                   
                   
                   
                   
                   
                   
                   
               
               
                 10  
                   
                 23.376  
                 ASP  
                 0.387  
                   
                   
                   
                   
               
               
                 11  
                 Lens  
                 −22.622  
                 ASP  
                 0.639  
                 Plastic  
                 1.544  
                 55.9  
                 4.36  
               
               
                   
                 5  
                   
                   
                   
                   
                   
                   
                   
               
               
                 12  
                   
                 −2.167  
                 ASP  
                 0.050  
                   
                   
                   
                   
               
               
                 13  
                 Lens  
                 3.212  
                 ASP  
                 0.200  
                 Plastic  
                 1.660  
                 20.4  
                 −10.60  
               
               
                   
                 6  
                   
                   
                   
                   
                   
                   
                   
               
               
                 14  
                   
                 2.150  
                 ASP  
                 0.731  
                   
                   
                   
                   
               
               
                 15  
                 Lens  
                 −15.396  
                 ASP  
                 0.205  
                 Plastic  
                 1.544  
                 55.0  
                 −3.24  
               
               
                   
                 7  
                   
                   
                   
                   
                   
                   
                   
               
               
                 16  
                   
                 1.996  
                 ASP  
                 0.200  
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 17  
                 Filter  
                 Plano  
                 0.210  
                 Glass  
                 1.517  
                 64.2  
                 — 
               
               
                 18  
                   
                 Plano  
                 0.236  
                   
                   
                   
                   
               
               
                 19  
                 Image  
                 Plano  
                 — 
               
               
                   
               
               
                 Reference wavelength is 587.6 nm (d-line) 
               
               
                 Effective radius of Stop on Surface 8 is 1.150 mm. 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 6 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Surface # 
                 1  
                 2  
                 4  
                 5  
                 6  
                 7  
                 9 
               
               
                   
               
               
                 k =  
                 −2.1299E+00  
                 −5.5110E+00  
                 −4.0000E−01  
                 −6.0000E−01  
                 −5.8380E+00  
                 −5.7411E+01  
                 −6.0793E+00  
               
               
                 A4 =   
                  5.4344E−03  
                  2.3927E−02  
                 −7.7535E−02  
                 −1.2341E−01  
                  2.8566E−02  
                 −3.1449E−02  
                 −1.5608E−01  
               
               
                 A6 =   
                 6.1128E−03  
                 −4.3516E−02  
                  6.7989E−02  
                  1.2897E−01  
                  5.5760E−02  
                 −4.8100E−03  
                  2.2789E−02  
               
               
                 A8 =   
                 −3.0929E−02  
                  9.2719E−03  
                 −1.4777E−01  
                 −2.3812E−01  
                 −1.3179E−01  
                  4.6571E−02  
                 −4.2540E−02  
               
               
                 A10 =  
                  3.2673E−02  
                  2.4263E−02  
                 2.2598E−01  
                  3.2952E−01  
                  1.9867E−01  
                 −8.7226E−02  
                  3.9499E−02  
               
               
                 A12 =  
                 −1.9719E−02  
                 −2.6670E−02  
                 −1.8513E−01  
                 −2.7793E−01  
                 −1.6962E−01  
                  8.6513E−02  
                  1.5062E−02  
               
               
                 A14 =  
                  6.3181E−03  
                 1.0658E−02  
                 7.6346E−02  
                  1.2367E−01  
                  7.6681E−02  
                 −4.2651E−02  
                 −2.8113E−02  
               
               
                 A16 =  
                 −9.0269E−04  
                 −1.6122E−03  
                 −1.2605E−02  
                 −2.2311E−02  
                 −1.4424E−02  
                  7.9044E−03  
                  8.6023E−03 
               
               
                   
               
               
                 Surface # 
                 10  
                 11  
                 12  
                 13  
                 14  
                 15  
                 16 
               
               
                   
               
               
                 k =  
                 −2.0529E−12  
                 −4.6232E+01  
                 −1.0316E+01  
                 −3.6614E+01  
                 −5.5111E+00  
                 −8.9973E+01  
                 −1.9377E+01  
               
               
                 A4 =   
                 −1.3799E−01  
                 −6.3955E−03  
                  2.0224E−01  
                  2.5065E−01  
                 −4.8249E−02  
                 −4.0660E−01  
                 −1.6006E−01  
               
               
                 A6 =   
                 −9.3425E−03  
                  1.0541E−01  
                 −7.2957E−01  
                 −8.1289E−01  
                 −2.3317E−02  
                  4.1443E−01  
                  1.0136E−01  
               
               
                 A8 =   
                  1.7057E−02  
                 −5.9101E−01  
                  1.4956E+00  
                  1.3205E+00  
                 −1.0534E−01  
                 −4.3158E−01  
                 −6.4703E−02  
               
               
                 A10 =  
                 −6.0815E−02  
                  1.2384E+00  
                 −2.1872E+00  
                 −1.6015E+00  
                  2.1694E−01  
                  3.1081E−01  
                  2.8867E−02  
               
               
                 A12 =  
                  1.3627E−01  
                 −1.6894E+00  
                  2.1560E+00  
                  1.3859E+00  
                 −1.9799E−01  
                 −1.3927E−01  
                 −7.7727E−03  
               
               
                 A14 =  
                 −1.2328E−01  
                  1.5129E+00  
                 −1.4073E+00  
                 −8.2054E−01  
                  1.0104E−01  
                  3.9067E−02  
                  1.1819E−03  
               
               
                 A16 =  
                  5.1666E−02  
                 −8.6815E−01  
                  5.8133E−01  
                  3.1090E−01  
                 −2.9316E−02  
                 −6.7218E−03  
                 −8.9858E−05  
               
               
                 A18 =  
                 −8.4412E−03  
                  2.9226E−01  
                 −1.3707E−01  
                 −6.6944E−02  
                  4.4960E−03  
                  6.5045E−04  
                  2.0444E−06  
               
               
                 A20 =  
                   
                 −4.4842E−02  
                  1.3984E−02  
                  6.1546E−03  
                 −2.8227E−04  
                 −2.7146E−05  
                  6.3719E−08 
               
               
                   
               
            
           
         
       
     
     In the 3rd embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 3rd embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from Table 5 and Table 6 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 3rd Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 3.85 
                 f1/f4 
                 0.03 
               
               
                 Fno 
                 1.47 
                 f3/f1 
                 0.92 
               
               
                 HFOV [deg.] 
                 40.0 
                 tan(HFOV) 
                 0.84 
               
               
                 T23/CT2 
                 0.82 
                 f/EPD 
                 1.47 
               
               
                 T67/CT6 
                 3.66 
                 TL/EPD 
                 1.88 
               
               
                 (T23 + T34 + T45 +  
                 11.61 
                 TL/ImgH 
                 1.47 
               
               
                 T67)/(T12 + T56) 
                   
                   
                   
               
               
                 R1/R6 
                 0.08 
                 TL [mm] 
                 4.93 
               
               
                 R4/R1 
                 0.64 
                 SD/TD 
                 0.87 
               
               
                 |R5/R6| 
                 0.08 
                 CRAmax [deg.] 
                 37.38 
               
               
                 R14/R13 
                 −0.13 
                 (TL × f)/(EPD × ImgH) 
                 2.16 
               
               
                 R14/EPD 
                 0.76 
                 Yc72/Yc62 
                 0.87 
               
               
                 R3/TD 
                 0.57 
                 Yc72/f 
                 0.22 
               
               
                 |f/f2| 
                 0.54 
               
               
                   
               
            
           
         
       
     
     Furthermore, according to the 3rd embodiment, each of at least two of the first lens element  310 , the second lens element  320 , the third lens element  330 , the fourth lens element  340 , the fifth lens element  350 , the sixth lens element  360  and the seventh lens element  370  has an Abbe number which is smaller than 25.0; in detail, the Abbe numbers of the second lens element  320 , the fourth lens element  340  and the sixth lens element  360  are smaller than 25.0. 
     According to the 3rd embodiment, a number of inflection points on each of object-side surfaces and image-side surfaces of the first lens element  310 , the second lens element  320 , the third lens element  330 , the fourth lens element  340 , the fifth lens element  350 , the sixth lens element  360  and the seventh lens element  370  is listed as follows. 
     
       
         
           
               
            
               
                   
               
               
                 3rd Embodiment-Numbers of inflection points  
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                 310  
                 320  
                 330  
                 340  
                 350  
                 360  
                 370 
               
               
                   
               
               
                 Object-side surface  
                 1  
                 1  
                 0  
                 1  
                 0  
                 2  
                 2  
               
               
                 Image-side surface  
                 1  
                 I  
                 1  
                 1  
                 1  
                 3  
                 2 
               
               
                   
               
            
           
         
       
     
     4th Embodiment 
       FIG.  7    is a schematic view of an imaging apparatus according to the 4th embodiment of the present disclosure.  FIG.  8    shows spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 4th embodiment. In  FIG.  7   , the imaging apparatus includes an image capturing optical system (its reference numeral is omitted) and an image sensor  495 . The image capturing optical system includes, in order from an object side to an image side, an aperture stop  400 , a first lens element  410 , a second lens element  420 , a third lens element  430 , a stop  401 , a fourth lens element  440 , a fifth lens element  450 , a sixth lens element  460 , a seventh lens element  470 , a filter  480  and an image surface  490 , wherein the image sensor  495  is disposed on the image surface  490  of the image capturing optical system. The image capturing optical system includes seven lens elements ( 410 ,  420 ,  430 ,  440 ,  450 ,  460  and  470 ) without additional one or more lens elements inserted between the first lens element  410  and the seventh lens element  470 , and each of the seven lens elements has an object-side surface towards the object side and an image-side surface towards the image side. 
     The first lens element  410  with positive refractive power has an object-side surface  411  being convex in a paraxial region thereof and an image-side surface  412  being concave in a paraxial region thereof. The first lens element  410  is made of a plastic material, and has the object-side surface  411  and the image-side surface  412  being both aspheric. Furthermore, the image-side surface  412  of the first lens element  410  includes at least one inflection point. 
     The second lens element  420  with negative refractive power has an object-side surface  421  being convex in a paraxial region thereof and an image-side surface  422  being concave in a paraxial region thereof. The second lens element  420  is made of plastic material, and has the object-side surface  421  and the image-side surface  422  being both aspheric. Furthermore, each of the object-side surface  421  and the image-side surface  422  of the second lens element  420  includes at least one inflection point. 
     The third lens element  430  with positive refractive power has an object-side surface  431  being convex in a paraxial region thereof and an image-side surface  432  being convex in a paraxial region thereof. The third lens element  430  is made of plastic material, and has the object-side surface  431  and the image-side surface  432  being both aspheric. 
     The fourth lens element  440  with positive refractive power has an object-side surface  441  being concave in a paraxial region thereof and an image-side surface  442  being convex in a paraxial region thereof. The fourth lens element  440  is made of plastic material, and has the object-side surface  441  and the image-side surface  442  being both aspheric. 
     The fifth lens element  450  with positive refractive power has an object-side surface  451  being concave in a paraxial region thereof and an image-side surface  452  being convex in a paraxial region thereof. The fifth lens element  450  is made of plastic material, and has the object-side surface  451  and the image-side surface  452  being both aspheric. 
     The sixth lens element  460  with negative refractive power has an object-side surface  461  being concave in a paraxial region thereof and an image-side surface  462  being concave in a paraxial region thereof. The sixth lens element  460  is made of plastic material, and has the object-side surface  461  and the image-side surface  462  being both aspheric. Furthermore, the image-side surface  462  of the sixth lens element  460  includes at least one inflection point. 
     The seventh lens element  470  with negative refractive power has an object-side surface  471  being concave in a paraxial region thereof and an image-side surface  472  being concave in a paraxial region thereof. The seventh lens element  470  is made of plastic material, and has the object-side surface  471  and the image-side surface  472  being both aspheric. Furthermore, each of the object-side surface  471  and the image-side surface  472  of the seventh lens element  470  includes at least one inflection point. 
     The filter  480  is made of a glass material and located between the seventh lens element  470  and the image surface  490 , and will not affect the focal length of the image capturing optical system. 
     The detailed optical data of the 4th embodiment are shown in Table 7 and the aspheric surface data are shown in Table 8 below. 
     
       
         
           
               
             
               
                 TABLE 7 
               
             
            
               
                   
               
               
                 4th Embodiment  
               
               
                 f = 3.91 mm, Fno = 1.45, HFOV = 40.0 deg.  
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Sur-  
                   
                   
                   
                   
                   
                   
                   
               
               
                 face  
                   
                 Curvature  
                 Thick-  
                 Ma-  
                   
                 Abbe  
                 Focal  
               
               
                 # 
                   
                 Radius  
                 ness  
                 terial  
                 Index  
                 # 
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0  
                 Object  
                 Plano  
                 Infinity  
                   
                   
                   
                   
               
               
                 1  
                 Ape.  
                 Plano  
                 −0.480  
                   
                   
                   
                   
               
               
                   
                 Stop  
                   
                   
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 2  
                 Lens  
                 2.112  
                 ASP  
                 0.583  
                 Plas-  
                 1.534  
                 55.9  
                 4.89  
               
               
                   
                 1  
                   
                   
                   
                 tic  
                   
                   
                   
               
               
                 3  
                   
                 10.002  
                 ASP  
                 0.050  
                   
                   
                   
                   
               
               
                 4  
                 Lens  
                 2.287  
                 ASP  
                 0.200  
                 Plas-  
                 1.671  
                 19.3  
                 −6.56  
               
               
                   
                 2  
                   
                   
                   
                 tic  
                   
                   
                   
               
               
                 5  
                   
                 1.452  
                 ASP  
                 0.210  
                   
                   
                   
                   
               
               
                 6  
                 Lens  
                 3.157  
                 ASP  
                 0.599  
                 Plas-  
                 1.559  
                 40.4  
                 5.19  
               
               
                   
                 3  
                   
                   
                   
                 tic  
                   
                   
                   
               
               
                 7  
                   
                 −32.834  
                 ASP  
                 −0.015  
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 8  
                 Stop  
                 Plano  
                 0.286  
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 9  
                 Lens  
                 −122.839  
                 ASP  
                 0.257  
                 Plas-  
                 1.634  
                 23.8  
                 134.70  
               
               
                   
                 4  
                   
                   
                   
                 tic  
                   
                   
                   
               
               
                 10  
                   
                 −50.417  
                 ASP  
                 0.327  
                   
                   
                   
                   
               
               
                 11  
                 Lens  
                 −16.808  
                 ASP  
                 0.685  
                 Plas-  
                 1.534  
                 55.9  
                 4.43  
               
               
                   
                 5  
                   
                   
                   
                 tic  
                   
                   
                   
               
               
                 12  
                   
                 −2.101  
                 ASP  
                 0.035  
                   
                   
                   
                   
               
               
                 13  
                 Lens  
                 −33.626  
                 ASP  
                 0.296  
                 Plas-  
                 1.660  
                 20.4  
                 −12.69  
               
               
                   
                 6  
                   
                   
                   
                 tic  
                   
                   
                   
               
               
                 14  
                   
                 11.190  
                 ASP  
                 0.656  
                   
                   
                   
                   
               
               
                 15  
                 Lens  
                 −6.110  
                 ASP  
                 0.200  
                 Plas-  
                 1.534  
                 55.9  
                 −2.87  
               
               
                   
                 7  
                   
                   
                   
                 tic  
                   
                   
                   
               
               
                 16  
                   
                 2.067  
                 ASP  
                 0.200  
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 17  
                 Filter  
                 Plano  
                 0.210  
                 Glass  
                 1.517  
                 64.2  
                 — 
               
               
                 18  
                   
                 Plano  
                 0.265  
                   
                   
                   
                   
               
               
                 19  
                 Image  
                 Plano  
                 — 
                   
                   
                   
                   
               
               
                   
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
               
                 Effective radius of Stop on Surface 8 is 1.126 mm. 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 8 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Surface # 
                 2  
                 3 
                 4  
                 6  
                 6  
                 7  
                 9 
               
               
                   
               
               
                 k =  
                 −3.7763E−01  
                 −5.5110E+00  
                 −4.1219E−01  
                 −6.0000E−01  
                 −6.6975E+00  
                 −5.7411E+01  
                 −6.0793E+00  
               
               
                 A4 =   
                 −2.5340E−03  
                  7.6871E−03  
                 −1.5424E−01  
                 −1.6548E−01  
                  2.3682E−02  
                 −4.2734E−02  
                 −1.6317E−01  
               
               
                 A6 =   
                  3.6742E−02  
                  9.5136E−02  
                  2.4293E−01  
                  1.9826E−01  
                  6.6881E−02  
                 −4.0771E−04  
                  3.0305E−02  
               
               
                 A8 =   
                 −7.6956E−02  
                 −2.3206E−01  
                 −4.3265E−01  
                 −2.8199E−01  
                 −1.4905E−01  
                  1.4678E−02  
                 −7.7842E−02  
               
               
                 A10 =  
                  9.0550E−02  
                  2.9296E−01  
                  4.8652E−01  
                  2.7837E−01  
                  2.0530E−01  
                 −1.3192E−02  
                  1.0999E−01  
               
               
                 A12 =  
                 −5.9800E−02  
                 −2.1025E−01  
                 −3.2724E−01  
                 −1.7472E−01  
                 −1.6735E−01  
                 −1.0195E−03  
                 −6.6574E−02  
               
               
                 A14 =  
                  2.1121E−02  
                  8.2506E−02  
                  1.2119E−01  
                  6.2827E−02  
                  7.4315E−02  
                  7.2571E−03  
                  1.7393E−02  
               
               
                 A16 =  
                 −3.0590E−03  
                 −1.3823E−02  
                 −1.9271E−02  
                 −1.0048E−02  
                 −1.3743E−02  
                 −2.8515E−03  
                 −1.2172E−03 
               
               
                   
               
               
                 Surface # 
                 10  
                 11  
                 12  
                 13  
                 14  
                 15  
                 16 
               
               
                   
               
               
                 k =  
                 −8.6679E−10  
                 −4.6232E+01  
                 −1.0249E+01  
                 −3.6614E+01  
                 −5.5111E+00  
                 −8.9979E+01  
                 −1.9377E+01  
               
               
                 A4 =   
                 −1.3454E−01  
                 −3.9448E−02  
                  6.2631E−02  
                  8.7782E−02  
                 −2.0100E−02  
                 −3.7075E−01  
                 −1.2272E−01  
               
               
                 A6 =   
                 −2.6405E−02  
                  1.8391E−01  
                 −3.1111E−01  
                 −3.9141E−01  
                 −6.4115E−02  
                  3.7699E−01  
                  8.1707E−02  
               
               
                 A8 =   
                  5.9541E−02  
                 −7.8957E−01  
                  4.9110E−01  
                  4.5546E−01  
                 −5.0287E−02  
                 −3.7385E−01  
                 −4.8625E−02  
               
               
                 A10 =  
                 −1.1223E−01  
                  1.6291E+00  
                 −6.4627E−01  
                 −4.9653E−01  
                  1.4763E−01  
                  2.5574E−01  
                  2.2014E−02  
               
               
                 A12 =  
                  1.6764E−01  
                 −2.1482E+00  
                  6.7540E−01  
                  5.3443E−01  
                 −1.2296E−01  
                 −1.0888E−01  
                 −6.9698E−03  
               
               
                 A14 =  
                 −1.3323E−01  
                  1.8432E+00  
                 −4.9233E−01  
                 −4.1162E−01  
                  5.3714E−02  
                  2.8759E−02  
                  1.4615E−03  
               
               
                 A16 =  
                  5.2472E−02  
                 −9.9772E−01  
                  2.2199E−01  
                  1.8766E−01  
                 −1.3272E−02  
                 −4.6619E−03  
                 −1.9262E−04  
               
               
                 A18 =  
                 −8.1428E−03  
                  3.0952E−01  
                 −5.4824E−02  
                 −4.5125E−02  
                  1.7537E−03  
                  4.3677E−04  
                  1.4386E−05  
               
               
                 A20 =  
                   
                 −4.2382E−02  
                  5.6208E−03  
                  4.4068E−03  
                 −9.6247E−05  
                 −1.8688E−05  
                 −4.6183E−07 
               
               
                   
               
            
           
         
       
     
     In the 4th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 4th embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from Table 7 and Table 8 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 4th Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 3.91 
                 f1/f4 
                 0.04 
               
               
                 Fno 
                 1.45 
                 f3/f1 
                 1.06 
               
               
                 HFOV [deg.] 
                 40.0 
                 tan(HFOV) 
                 0.84 
               
               
                 T23/CT2 
                 1.05 
                 f/EPD 
                 1.45 
               
               
                 T67/CT6 
                 2.21 
                 TL/EPD 
                 1.87 
               
               
                 (T23 + T34 + T45 +  
                 17.23 
                 TL/ImgH 
                 1.51 
               
               
                 T67)/(T12 + T56) 
                   
                   
                   
               
               
                 R1/R6 
                 −0.06 
                 TL [mm] 
                 5.04 
               
               
                 R4/R1 
                 0.69 
                 SD/TD 
                 0.89 
               
               
                 |R5/R6| 
                 0.10 
                 CRAmax [deg.] 
                 36.88 
               
               
                 R14/R13 
                 −0.34 
                 (TL × f)/(EPD × ImgH) 
                 2.20 
               
               
                 R14/EPD 
                 0.77 
                 Yc72/Yc62 
                 1.50 
               
               
                 R3/TD 
                 0.52 
                 Yc72/f 
                 0.24 
               
               
                 |f/f2| 
                 0.60 
               
               
                   
               
            
           
         
       
     
     Furthermore, according to the 4th embodiment, each of at least two of the first lens element  410 , the second lens element  420 , the third lens element  430 , the fourth lens element  440 , the fifth lens element  450 , the sixth lens element  460  and the seventh lens element  470  has an Abbe number which is smaller than 25.0; in detail, the Abbe numbers of the second lens element  420 , the fourth lens element  440  and the sixth lens element  460  are smaller than 25.0. 
     According to the 4th embodiment, a number of inflection points on each of object-side surfaces and image-side surfaces of the first lens element  410 , the second lens element  420 , the third lens element  430 , the fourth lens element  440 , the fifth lens element  450 , the sixth lens element  460  and the seventh lens element  470  is listed as follows. 
     
       
         
           
               
            
               
                   
               
               
                 4th Embodiment-Numbers of inflection points  
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                 410  
                 420  
                 430  
                 440  
                 450  
                 460  
                 470 
               
               
                   
               
               
                 Object-side surface  
                 0  
                 1  
                 0  
                 0  
                 0  
                 0  
                 1  
               
               
                 Image-side surface  
                 1  
                 1  
                 0  
                 0  
                 0  
                 2  
                 1 
               
               
                   
               
            
           
         
       
     
     5th Embodiment 
       FIG.  9    is a schematic view of an imaging apparatus according to the 5th embodiment of the present disclosure.  FIG.  10    shows spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 5th embodiment. In  FIG.  9   , the imaging apparatus includes an image capturing optical system (its reference numeral is omitted) and an image sensor  595 . The image capturing optical system includes, in order from an object side to an image side, an aperture stop  500 , a first lens element  510 , a second lens element  520 , a third lens element  530 , a stop  501 , a fourth lens element  540 , a fifth lens element  550 , a sixth lens element  560 , a seventh lens element  570 , a filter  580  and an image surface  590 , wherein the image sensor  595  is disposed on the image surface  590  of the image capturing optical system. The image capturing optical system includes seven lens elements ( 510 ,  520 ,  530 ,  540 ,  550 ,  560  and  570 ) without additional one or more lens elements inserted between the first lens element  510  and the seventh lens element  570 , and each of the seven lens elements has an object-side surface towards the object side and an image-side surface towards the image side. 
     The first lens element  510  with positive refractive power has an object-side surface  511  being convex in a paraxial region thereof and an image-side surface  512  being concave in a paraxial region thereof. The first lens element  510  is made of a plastic material, and has the object-side surface  511  and the image-side surface  512  being both aspheric. 
     The second lens element  520  with negative refractive power has an object-side surface  521  being convex in a paraxial region thereof and an image-side surface  522  being concave in a paraxial region thereof. The second lens element  520  is made of plastic material, and has the object-side surface  521  and the image-side surface  522  being both aspheric. Furthermore, each of the object-side surface  521  and the image-side surface  522  of the second lens element  520  includes at least one inflection point. 
     The third lens element  530  with positive refractive power has an object-side surface  531  being convex in a paraxial region thereof and an image-side surface  532  being concave in a paraxial region thereof. The third lens element  530  is made of plastic material, and has the object-side surface  531  and the image-side surface  532  being both aspheric. Furthermore, the image-side surface  532  of the third lens element  530  includes at least one inflection point. 
     The fourth lens element  540  with negative refractive power has an object-side surface  541  being convex in a paraxial region thereof and an image-side surface  542  being concave in a paraxial region thereof. The fourth lens element  540  is made of plastic material, and has the object-side surface  541  and the image-side surface  542  being both aspheric. Furthermore, each of the object-side surface  541  and the image-side surface  542  of the fourth lens element  540  includes at least one inflection point. 
     The fifth lens element  550  with positive refractive power has an object-side surface  551  being concave in a paraxial region thereof and an image-side surface  552  being convex in a paraxial region thereof. The fifth lens element  550  is made of plastic material, and has the object-side surface  551  and the image-side surface  552  being both aspheric. 
     The sixth lens element  560  with positive refractive power has an object-side surface  561  being convex in a paraxial region thereof and an image-side surface  562  being concave in a paraxial region thereof. The sixth lens element  560  is made of plastic material, and has the object-side surface  561  and the image-side surface  562  being both aspheric. Furthermore, each of the object-side surface  561  and the image-side surface  562  of the sixth lens element  560  includes at least one inflection point. 
     The seventh lens element  570  with negative refractive power has an object-side surface  571  being convex in a paraxial region thereof and an image-side surface  572  being concave in a paraxial region thereof. The seventh lens element  570  is made of plastic material, and has the object-side surface  571  and the image-side surface  572  being both aspheric. Furthermore, each of the object-side surface  571  and the image-side surface  572  of the seventh lens element  570  includes at least one inflection point. 
     The filter  580  is made of a glass material and located between the seventh lens element  570  and the image surface  590 , and will not affect the focal length of the image capturing optical system. 
     The detailed optical data of the 5th embodiment are shown in Table 9 and the aspheric surface data are shown in Table 10 below. 
     
       
         
           
               
             
               
                 TABLE 9 
               
             
            
               
                   
               
               
                 5th Embodiment  
               
               
                 f = 4.11 mm, Fno = 1.46, HFOV = 37.1 deg.  
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Sur-  
                   
                   
                   
                   
                   
                   
                   
               
               
                 face  
                   
                 Curvature  
                 Thick-  
                   
                   
                 Abbe  
                 Focal  
               
               
                 # 
                   
                 Radius  
                 ness  
                 Material  
                 Index  
                 # 
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0  
                 Object  
                 Plano  
                 Infinity  
                   
                   
                   
                   
               
               
                 1  
                 Ape.  
                 Plano  
                 −0.580  
                   
                   
                   
                   
               
               
                   
                 Stop  
                   
                   
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 2  
                 Lens 1  
                 2.040  
                 ASP  
                 0.710  
                 Plastic  
                 1.534  
                 55.9  
                 4.82  
               
               
                 3  
                   
                 8.647  
                 ASP  
                 0.208  
                   
                   
                   
                   
               
               
                 4  
                 Lens 2  
                 3.135  
                 ASP  
                 0.200  
                 Plastic  
                 1.671  
                 19.3  
                 −6.16  
               
               
                 5  
                   
                 1.737  
                 ASP  
                 0.066  
                   
                   
                   
                   
               
               
                 6  
                 Lens 3  
                 2.921  
                 ASP  
                 0.524  
                 Plastic  
                 1.559  
                 40.4  
                 5.71  
               
               
                 7  
                   
                 32.258  
                 ASP  
                 0.000  
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 8  
                 Stop  
                 Plano  
                 0.274  
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 9  
                 Lens 4  
                 28.236  
                 ASP  
                 0.200  
                 Plastic  
                 1.634  
                 23.8  
                 −70.05  
               
               
                 10  
                   
                 17.214  
                 ASP  
                 0.298  
                   
                   
                   
                   
               
               
                 11  
                 Lens 5  
                 −19.846  
                 ASP  
                 0.671  
                 Plastic  
                 1.534  
                 55.9  
                 7.12  
               
               
                 12  
                   
                 −3.227  
                 ASP  
                 0.074  
                   
                   
                   
                   
               
               
                 13  
                 Lens 6  
                 8.162  
                 ASP  
                 0.466  
                 Plastic  
                 1.534  
                 55.9  
                 46.80  
               
               
                 14  
                   
                 11.882  
                 ASP  
                 0.634  
                   
                   
                   
                   
               
               
                 15  
                 Lens 7  
                 168.979  
                 ASP  
                 0.238  
                 Plastic  
                 1.534  
                 55.9  
                 −3.00  
               
               
                 16  
                   
                 1.583  
                 ASP  
                 0.200  
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 17  
                 Filter  
                 Plano  
                 0.210  
                 Glass  
                 1.517  
                 64.2  
                 — 
               
               
                 18  
                   
                 Plano  
                 0.198  
                   
                   
                   
                   
               
               
                 19  
                 Image  
                 Plano  
                 — 
                   
                   
                   
                   
               
               
                   
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
               
                 Effective radius of Stop on Surface 8 is 1.142 mm. 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 10 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Surface # 
                 2  
                 3  
                 4  
                 5  
                 6  
                 7  
                 9 
               
               
                   
               
               
                 k =  
                 −3.4676E−01  
                 −5.5111E+00  
                 −4.0000E−01  
                 −6.0517E−01  
                 −6.8499E+00  
                 −5.7411E+01  
                 −6.0793E+00  
               
               
                 A4 =   
                  3.3401E−03  
                 −1.0873E−02  
                 −1.5294E−01  
                 −1.7869E−01  
                  2.8887E−03  
                 −4.0137E−02  
                 −1.7788E−01  
               
               
                 A6 =   
                  4.0881E−04  
                  4.3770E−02  
                  2.0546E−01  
                  3.0680E−01  
                  1.2962E−01  
                  2.6369E−02  
                 −5.0725E−02  
               
               
                 A8 =   
                  1.0440E−02  
                 −7.7076E−02  
                 −3.2025E−01  
                 −4.9409E−01  
                 −2.1508E−01  
                 −3.0396E−02  
                  1.9410E−01  
               
               
                 A10 =  
                 −1.9707E−02  
                  9.1328E−02  
                  3.6043E−01  
                  4.7116E−01  
                  1.2929E−01  
                  3.7709E−02  
                 −2.7272E−01  
               
               
                 A12 =  
                  1.7883E−02  
                 −6.2509E−02  
                 −2.4853E−01  
                 −2.4683E−01  
                  1.6257E−02  
                 −4.7128E−02  
                  2.2408E−01  
               
               
                 A14 =  
                 −7.6123E−03  
                  2.3306E−02  
                  9.2065E−02  
                  6.2472E−02  
                 −4.1725E−02  
                  3.6547E−02  
                 −9.3723E−02  
               
               
                 A16 =  
                  1.3232E−03  
                 −3.6057E−03  
                 −1.4278E−02  
                 −5.7622E−03  
                  1.1374E−02  
                 −1.0118E−02  
                  1.5845E−02 
               
               
                   
               
               
                 Surface # 
                 10  
                 11  
                 12  
                 13  
                 14  
                 15  
                 16 
               
               
                   
               
               
                 k =  
                 −7.1763E−05  
                 −4.6232E+01  
                 −1.0807E+01  
                 −3.6614E+01  
                 −5.5110E+00  
                 −8.9979E+01  
                 −1.9379E+01  
               
               
                 A4 =   
                 −1.5303E−01  
                  2.1835E−02  
                  1.8490E−01  
                  2.3691E−01  
                  7.1008E−02  
                 −4.6763E−01  
                 −8.9838E−02  
               
               
                 A6 =   
                 −3.2481E−02  
                 −9.0723E−02  
                 −7.9611E−01  
                 −8.8495E−01  
                 −1.5853E−01  
                  7.0728E−01  
                  6.1981E−02  
               
               
                 A8 =   
                  2.8750E−02  
                 −7.4738E−02  
                  1.2594E+00  
                  1.2383E+00  
                  3.9023E−03  
                 −9.1531E−01  
                 −5.2482E−02  
               
               
                 A10 =  
                  1.3676E−01  
                  3.5803E−01  
                 −1.2730E+00  
                 −1.2056E+00  
                  1.1870E−01  
                  7.4519E−01  
                  3.2048E−02  
               
               
                 A12 =  
                 −2.7587E−01  
                 −5.6580E−01  
                  8.9190E−01  
                  8.9657E−01  
                 −9.6135E−02  
                 −3.6584E−01  
                 −1.1927E−02  
               
               
                 A14 =  
                  2.4746E−01  
                  5.0794E−01  
                 −4.3954E−01  
                 −4.8090E−01  
                  3.6153E−02  
                  1.0904E−01  
                  2.6633E−03  
               
               
                 A16 =  
                 −1.1060E−01  
                 −2.7305E−01  
                  1.4434E−01  
                  1.6580E−01  
                 −7.4099E−03  
                 −1.9339E−02  
                 −3.5034E−04  
               
               
                 A18 =  
                  2.0418E−02  
                  8.0609E−02  
                 −2.8021E−02  
                 −3.2032E−02  
                  8.0913E−04  
                  1.8806E−03  
                  2.5067E−05  
               
               
                 A20 =  
                   
                 −1.0144E−02  
                 2.3925E−03  
                  2.6105E−03  
                 −3.7411E−06  
                 −7.7381E−05  
                 −7.5281E−07 
               
               
                   
               
            
           
         
       
     
     In the 5th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 5th embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from Table 9 and Table 10 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 5th Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 4.11 
                 f1/f4 
                 −0.07 
               
               
                 Fno 
                 1.46 
                 f3/f1 
                 1.18 
               
               
                 HFOV [deg.] 
                 37.1 
                 tan(HFOV) 
                 0.76 
               
               
                 T23/CT2 
                 0.33 
                 f/EPD 
                 1.46 
               
               
                 T67/CT6 
                 1.36 
                 TL/EPD 
                 1.84 
               
               
                 (T23 + T34 + T45 +  
                 4.52 
                 TL/ImgH 
                 1.62 
               
               
                 T67)/(T12 + T56) 
                   
                   
                   
               
               
                 R1/R6 
                 0.06 
                 TL [mm] 
                 5.17 
               
               
                 R4/R1 
                 0.85 
                 SD/TD 
                 0.87 
               
               
                 |R5/R6| 
                 0.09 
                 CRAmax [deg.] 
                 35.89 
               
               
                 R14/R13 
                 0.01 
                 (TL × f)/(EPD × ImgH) 
                 2.36 
               
               
                 R14/EPD 
                 0.56 
                 Yc72/Yc62 
                 1.35 
               
               
                 R3/TD 
                 0.69 
                 Yc72/f 
                 0.25 
               
               
                 |f/f2| 
                 0.67 
               
               
                   
               
            
           
         
       
     
     Furthermore, according to the 5th embodiment, each of at least two of the first lens element  510 , the second lens element  520 , the third lens element  530 , the fourth lens element  540 , the fifth lens element  550 , the sixth lens element  560  and the seventh lens element  570  has an Abbe number which is smaller than 25.0; in detail, the Abbe numbers of the second lens element  520  and the fourth lens element  540  are smaller than 25.0. 
     According to the 5th embodiment, a number of inflection points on each of object-side surfaces and image-side surfaces of the first lens element  510 , the second lens element  520 , the third lens element  530 , the fourth lens element  540 , the fifth lens element  550 , the sixth lens element  560  and the seventh lens element  570  is listed as follows. 
     
       
         
           
               
            
               
                   
               
               
                 5th Embodiment-Numbers of inflection points  
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                 510  
                 520  
                 530  
                 540  
                 550  
                 560  
                 570 
               
               
                   
               
               
                 Object-side surface  
                 0  
                 1  
                 0  
                 1  
                 0  
                 1  
                 3  
               
               
                 Image-side surface  
                 0  
                 1  
                 2  
                 2  
                 0  
                 3  
                 3 
               
               
                   
               
            
           
         
       
     
     6th Embodiment 
       FIG.  11    is a schematic view of an imaging apparatus according to the 6th embodiment of the present disclosure.  FIG.  12    shows spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 6th embodiment. In  FIG.  11   , the imaging apparatus includes an image capturing optical system (its reference numeral is omitted) and an image sensor  695 . The image capturing optical system includes, in order from an object side to an image side, an aperture stop  600 , a first lens element  610 , a second lens element  620 , a third lens element  630 , a stop  601 , a fourth lens element  640 , a fifth lens element  650 , a sixth lens element  660 , a seventh lens element  670 , a filter  680  and an image surface  690 , wherein the image sensor  695  is disposed on the image surface  690  of the image capturing optical system. The image capturing optical system includes seven lens elements ( 610 ,  620 ,  630 ,  640 ,  650 ,  660  and  670 ) without additional one or more lens elements inserted between the first lens element  610  and the seventh lens element  670 , and each of the seven lens elements has an object-side surface towards the object side and an image-side surface towards the image side. 
     The first lens element  610  with positive refractive power has an object-side surface  611  being convex in a paraxial region thereof and an image-side surface  612  being concave in a paraxial region thereof. The first lens element  610  is made of a plastic material, and has the object-side surface  611  and the image-side surface  612  being both aspheric. 
     The second lens element  620  with negative refractive power has an object-side surface  621  being convex in a paraxial region thereof and an image-side surface  622  being concave in a paraxial region thereof. The second lens element  620  is made of plastic material, and has the object-side surface  621  and the image-side surface  622  being both aspheric. Furthermore, each of the object-side surface  621  and the image-side surface  622  of the second lens element  620  includes at least one inflection point. 
     The third lens element  630  with positive refractive power has an object-side surface  631  being convex in a paraxial region thereof and an image-side surface  632  being concave in a paraxial region thereof. The third lens element  630  is made of plastic material, and has the object-side surface  631  and the image-side surface  632  being both aspheric. Furthermore, the image-side surface  632  of the third lens element  630  includes at least one inflection point. 
     The fourth lens element  640  with negative refractive power has an object-side surface  641  being convex in a paraxial region thereof and an image-side surface  642  being concave in a paraxial region thereof. The fourth lens element  640  is made of plastic material, and has the object-side surface  641  and the image-side surface  642  being both aspheric. Furthermore, each of the object-side surface  641  and the image-side surface  642  of the fourth lens element  640  includes at least one inflection point. 
     The fifth lens element  650  with positive refractive power has an object-side surface  651  being convex in a paraxial region thereof and an image-side surface  652  being convex in a paraxial region thereof. The fifth lens element  650  is made of plastic material, and has the object-side surface  651  and the image-side surface  652  being both aspheric. Furthermore, the object-side surface  651  of the fifth lens element  650  includes at least one inflection point. 
     The sixth lens element  660  with positive refractive power has an object-side surface  661  being convex in a paraxial region thereof and an image-side surface  662  being concave in a paraxial region thereof. The sixth lens element  660  is made of plastic material, and has the object-side surface  661  and the image-side surface  662  being both aspheric. Furthermore, each of the object-side surface  661  and the image-side surface  662  of the sixth lens element  660  includes at least one inflection point. 
     The seventh lens element  670  with negative refractive power has an object-side surface  671  being concave in a paraxial region thereof and an image-side surface  672  being concave in a paraxial region thereof. The seventh lens element  670  is made of plastic material, and has the object-side surface  671  and the image-side surface  672  being both aspheric. Furthermore, each of the object-side surface  671  and the image-side surface  672  of the seventh lens element  670  includes at least one inflection point. 
     The filter  680  is made of a glass material and located between the seventh lens element  670  and the image surface  690 , and will not affect the focal length of the image capturing optical system. 
     The detailed optical data of the 6th embodiment are shown in Table 11 and the aspheric surface data are shown in Table 12 below. 
     
       
         
           
               
             
               
                 TABLE 11 
               
             
            
               
                   
               
               
                 6th Embodiment  
               
               
                 f = 4.17 mm, Fno = 1.42, HFOV = 36.6 deg.  
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Sur-  
                   
                   
                   
                   
                   
                   
                   
               
               
                 face  
                   
                 Curvature  
                 Thick-  
                   
                   
                 Abbe  
                 Focal  
               
               
                 # 
                   
                 Radius  
                 ness  
                 Material  
                 Index  
                 # 
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0  
                 Object  
                 Plano  
                 Infinity  
                   
                   
                   
                   
               
               
                 1  
                 Ape.  
                 Plano  
                 −0.600  
                   
                   
                   
                   
               
               
                   
                 Stop  
                   
                   
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 2  
                 Lens 1  
                 2.087  
                 ASP  
                 0.668  
                 Plastic  
                 1.534  
                 55.9  
                 5.19  
               
               
                 3  
                   
                 7.491  
                 ASP  
                 0.076  
                   
                   
                   
                   
               
               
                 4  
                 Lens 2  
                 2.291  
                 ASP  
                 0.200  
                 Plastic  
                 1.671  
                 19.3  
                 −7.67  
               
               
                 5  
                   
                 1.530  
                 ASP  
                 0.102  
                   
                   
                   
                   
               
               
                 6  
                 Lens 3  
                 2.776  
                 ASP  
                 0.664  
                 Plastic  
                 1.534  
                 55.9  
                 6.38  
               
               
                 7  
                   
                 13.899  
                 ASP  
                 0.060  
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 8  
                 Stop  
                 Plano  
                 0.271  
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 9  
                 Lens 4  
                 739.602  
                 ASP  
                 0.200  
                 Plastic  
                 1.559  
                 40.4  
                 −24.92  
               
               
                 10  
                   
                 13.667  
                 ASP  
                 0.201  
                   
                   
                   
                   
               
               
                 11  
                 Lens 5  
                 85.531  
                 ASP  
                 0.586  
                 Plastic  
                 1.534  
                 55.9  
                 37.09  
               
               
                 12  
                   
                 −25.706  
                 ASP  
                 0.200  
                   
                   
                   
                   
               
               
                 13  
                 Lens 6  
                 3.037  
                 ASP  
                 0.730  
                 Plastic  
                 1.534  
                 55.9  
                 6.83  
               
               
                 14  
                   
                 18.607  
                 ASP  
                 0.585  
                   
                   
                   
                   
               
               
                 15  
                 Lens 7  
                 −9.197  
                 ASP  
                 0.318  
                 Plastic  
                 1.534  
                 55.9  
                 −3.20  
               
               
                 16  
                   
                 2.119  
                 ASP  
                 0.200  
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 17  
                 Filter  
                 Plano  
                 0.210  
                 Glass  
                 1.517  
                 64.2  
                 — 
               
               
                 18  
                   
                 Plano  
                 0.139  
                   
                   
                   
                   
               
               
                 19  
                 Image  
                 Plano  
                 — 
                   
                   
                   
                   
               
               
                   
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
               
                 Effective radius of Stop on Surface 8 is 1.169 mm. 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 12 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Surface # 
                 2  
                 3  
                 4  
                 5  
                 6  
                 7  
                 9 
               
               
                   
               
               
                 k =  
                 −5.2123E−01  
                 −5.5111E+00  
                 −4.0000E−01  
                 −6.0000E−01  
                 −5.5492E+00  
                 −5.7411E+01  
                 −6.0793E+00  
               
               
                 A4 =   
                  6.7501E−03  
                 −3.0211E−02  
                 −1.8195E−01  
                 −2.0470E−01  
                 −6.6854E−03  
                 −2.4778E−02  
                 −1.7342E−01  
               
               
                 A6 =   
                  3.8466E−03  
                  1.2727E−01  
                  3.3178E−01  
                  3.3073E−01  
                  5.3820E−02  
                  7.0201E−04  
                  1.7991E−02  
               
               
                 A8 =   
                 −6.3514E−03  
                 −2.1244E−01  
                 −4.9878E−01  
                 −4.2105E−01  
                  4.1072E−02  
                  1.5467E−02  
                 −4.3519E−02  
               
               
                 A10 =  
                  6.4908E−03  
                  2.0248E−01  
                  4.6362E−01  
                  2.9918E−01  
                 −1.9181E−01  
                 −1.9584E−02  
                  1.3125E−01  
               
               
                 A12 =  
                 −3.4514E−03  
                 −1.1131E−01  
                 −2.5469E−01  
                 −9.8687E−02  
                  2.1894E−01  
                  1.0199E−02  
                 −1.3975E−01  
               
               
                 A14 =  
                  9.5256E−04  
                  3.3287E−02  
                  7.6548E−02  
                  7.1490E−03  
                 −1.0547E−01  
                 −1.4796E−03  
                  7.3883E−02  
               
               
                 A16 =  
                 −8.7889E−05  
                 −4.1665E−03  
                 −9.7702E−03  
                  1.7140E−03  
                  1.8945E−02  
                 −2.1400E−04  
                 −1.5389E−02 
               
               
                   
               
               
                 Surface # 
                 10  
                 11  
                 12  
                 13  
                 14  
                 15  
                 16 
               
               
                   
               
               
                 k =  
                 −7.1763E−05  
                 −4.6232E+01  
                 −1.0807E+01  
                 −3.6614E+01  
                 −5.5110E+00  
                 −8.9979E+01  
                 −1.9379E+01  
               
               
                 A4 =   
                 −1.4188E−01  
                 −2.1015E−02  
                 −1.3780E−01  
                  1.3398E−02  
                 −1.1324E−02  
                 −3.0902E−01  
                 −1.0372E−01  
               
               
                 A6 =   
                 −3.0183E−02  
                 −2.9224E−02  
                  1.3369E−01  
                 −1.4464E−01  
                 −4.1586E−03  
                  3.3468E−01  
                  9.2664E−02  
               
               
                 A8 =   
                  4.4309E−02  
                 −1.1476E−02  
                 −1.9136E−01  
                  2.0567E−01  
                 −3.2995E−02  
                 −3.1558E−01  
                 −6.1913E−02  
               
               
                 A10 =  
                  3.2749E−03  
                 −5.0416E−02  
                  1.8850E−01  
                 −2.4699E−01  
                  2.5862E−02  
                  1.9497E−01  
                  2.5352E−02  
               
               
                 A12 =  
                 −6.3614E−03  
                  1.8155E−01  
                 −1.3292E−01  
                  2.0499E−01  
                 −9.8116E−03  
                 −8.2045E−02  
                 −6.4034E−03  
               
               
                 A14 =  
                 −1.3962E−03  
                 −2.3872E−01  
                  6.4713E−02  
                 −1.1107E−01  
                  1.4895E−03  
                  2.3861E−02  
                  1.0147E−03  
               
               
                 A16 =  
                  1.3427E−03  
                  1.6046E−01  
                 −2.1610E−02  
                  3.7223E−02  
                  1.4898E−04  
                 −4.4893E−03  
                 −9.9114E−05  
               
               
                 A18 =  
                  4.7351E−04  
                 −5.6255E−02  
                  4.5813E−03  
                 −7.0397E−03  
                 −6.8028E−05  
                  4.8117E−04  
                  5.4834E−06  
               
               
                 A20 =  
                   
                  8.0341E−03  
                 −4.8235E−04  
                  5.7791E−04  
                  5.1332E−06  
                 −2.2093E−05  
                 −1.3182E−07 
               
               
                   
               
            
           
         
       
     
     In the 6th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 6th embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from Table 11 and Table 12 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 6th Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 4.17 
                 f1/f4 
                 −0.21 
               
               
                 Fno 
                 1.42 
                 f3/f1 
                 1.23 
               
               
                 HFOV [deg.] 
                 36.6 
                 tan(HFOV) 
                 0.74 
               
               
                 T23/CT2 
                 0.51 
                 f/EPD 
                 1.42 
               
               
                 T67/CT6 
                 0.80 
                 TL/EPD 
                 1.81 
               
               
                 (T23 + T34 + T45 +  
                 4.43 
                 TL/ImgH 
                 1.66 
               
               
                 T67)/(T12 + T56) 
                   
                   
                   
               
               
                 R1/R6 
                 0.15 
                 TL [mm] 
                 5.31 
               
               
                 R4/R1 
                 0.73 
                 SD/TD 
                 0.87 
               
               
                 |R5/R6| 
                 0.20 
                 CRAmax [deg.] 
                 36.45 
               
               
                 R14/R13 
                 −0.23 
                 (TL × f)/(EPD × ImgH) 
                 2.36 
               
               
                 R14/EPD 
                 0.72 
                 Yc72/Yc62 
                 1.52 
               
               
                 R3/TD 
                 0.48 
                 Yc72/f 
                 0.27 
               
               
                 |f/f2| 
                 0.54 
               
               
                   
               
            
           
         
       
     
     According to the 6th embodiment, a number of inflection points on each of object-side surfaces and image-side surfaces of the first lens element  610 , the second lens element  620 , the third lens element  630 , the fourth lens element  640 , the fifth lens element  650 , the sixth lens element  660  and the seventh lens element  670  is listed as follows. 
     
       
         
           
               
            
               
                   
               
               
                 6th Embodiment-Numbers of inflection points  
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                 610  
                 620  
                 630  
                 640  
                 650  
                 660  
                 670 
               
               
                   
               
               
                 Object-side surface  
                 0  
                 1  
                 0  
                 1  
                 1  
                 2  
                 2  
               
               
                 Image-side surface  
                 0  
                 1  
                 1  
                 2  
                 0  
                 3  
                 1 
               
               
                   
               
            
           
         
       
     
     7th Embodiment 
       FIG.  13    is a schematic view of an imaging apparatus according to the 7th embodiment of the present disclosure.  FIG.  14    shows spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 7th embodiment. In  FIG.  13   , the imaging apparatus includes an image capturing optical system (its reference numeral is omitted) and an image sensor  795 . The image capturing optical system includes, in order from an object side to an image side, an aperture stop  700 , a first lens element  710 , a second lens element  720 , a third lens element  730 , a fourth lens element  740 , a stop  701 , a fifth lens element  750 , a sixth lens element  760 , a seventh lens element  770 , a filter  780  and an image surface  790 , wherein the image sensor  795  is disposed on the image surface  790  of the image capturing optical system. The image capturing optical system includes seven lens elements ( 710 ,  720 ,  730 ,  740 ,  750 ,  760  and  770 ) without additional one or more lens elements inserted between the first lens element  710  and the seventh lens element  770 , and each of the seven lens elements has an object-side surface towards the object side and an image-side surface towards the image side. 
     The first lens element  710  with positive refractive power has an object-side surface  711  being convex in a paraxial region thereof and an image-side surface  712  being concave in a paraxial region thereof. The first lens element  710  is made of a plastic material, and has the object-side surface  711  and the image-side surface  712  being both aspheric. Furthermore, each of the object-side surface  711  and the image-side surface  712  of the first lens element  710  includes at least one inflection point. 
     The second lens element  720  with negative refractive power has an object-side surface  721  being convex in a paraxial region thereof and an image-side surface  722  being concave in a paraxial region thereof. The second lens element  720  is made of plastic material, and has the object-side surface  721  and the image-side surface  722  being both aspheric. Furthermore, the object-side surface  721  of the second lens element  720  includes at least one inflection point. 
     The third lens element  730  with positive refractive power has an object-side surface  731  being convex in a paraxial region thereof and an image-side surface  732  being concave in a paraxial region thereof. The third lens element  730  is made of plastic material, and has the object-side surface  731  and the image-side surface  732  being both aspheric. Furthermore, the image-side surface  732  of the third lens element  730  includes at least one inflection point. 
     The fourth lens element  740  with positive refractive power has an object-side surface  741  being convex in a paraxial region thereof and an image-side surface  742  being concave in a paraxial region thereof. The fourth lens element  740  is made of plastic material, and has the object-side surface  741  and the image-side surface  742  being both aspheric. Furthermore, each of the object-side surface  741  and the image-side surface  742  of the fourth lens element  740  includes at least one inflection point. 
     The fifth lens element  750  with positive refractive power has an object-side surface  751  being concave in a paraxial region thereof and an image-side surface  752  being convex in a paraxial region thereof. The fifth lens element  750  is made of plastic material, and has the object-side surface  751  and the image-side surface  752  being both aspheric. Furthermore, the image-side surface  752  of the fifth lens element  750  includes at least one inflection point. 
     The sixth lens element  760  with negative refractive power has an object-side surface  761  being convex in a paraxial region thereof and an image-side surface  762  being concave in a paraxial region thereof. The sixth lens element  760  is made of plastic material, and has the object-side surface  761  and the image-side surface  762  being both aspheric. Furthermore, each of the object-side surface  761  and the image-side surface  762  of the sixth lens element  760  includes at least one inflection point. 
     The seventh lens element  770  with negative refractive power has an object-side surface  771  being convex in a paraxial region thereof and an image-side surface  772  being concave in a paraxial region thereof. The seventh lens element  770  is made of plastic material, and has the object-side surface  771  and the image-side surface  772  being both aspheric. Furthermore, each of the object-side surface  771  and the image-side surface  772  of the seventh lens element  770  includes at least one inflection point. 
     The filter  780  is made of a glass material and located between the seventh lens element  770  and the image surface  790 , and will not affect the focal length of the image capturing optical system. 
     The detailed optical data of the 7th embodiment are shown in Table 13 and the aspheric surface data are shown in Table 14 below. 
     
       
         
           
               
             
               
                 TABLE 13 
               
             
            
               
                   
               
               
                 7th Embodiment  
               
               
                 f = 4.22 mm, Fno = 1.45, HFOV = 38.5 deg.  
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Sur-  
                   
                   
                   
                   
                   
                   
                   
               
               
                 face  
                   
                 Curvature  
                 Thick-  
                   
                   
                 Abbe  
                 Focal  
               
               
                 # 
                   
                 Radius  
                 ness  
                 Material  
                 Index  
                 # 
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0  
                 Object  
                 Plano  
                 Infinity  
                   
                   
                   
                   
               
               
                 1  
                 Ape.  
                 Plano  
                 −0.400  
                   
                   
                   
                   
               
               
                   
                 Stop  
                   
                   
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 2  
                 Lens 1  
                 2.123  
                 ASP  
                 0.598  
                 Plastic  
                 1.545  
                 56.0  
                 6.23  
               
               
                 3  
                   
                 5.106  
                 ASP  
                 0.030  
                   
                   
                   
                   
               
               
                 4  
                 Lens 2  
                 2.597  
                 ASP  
                 0.230  
                 Plastic  
                 1.660  
                 20.4  
                 −7.95  
               
               
                 5  
                   
                 1.676  
                 ASP  
                 0.160  
                   
                   
                   
                   
               
               
                 6  
                 Lens 3  
                 2.529  
                 ASP  
                 0.597  
                 Plastic  
                 1.544  
                 55.9  
                 5.15  
               
               
                 7  
                   
                 23.939  
                 ASP  
                 0.359  
                   
                   
                   
                   
               
               
                 8  
                 Lens 4  
                 19.422  
                 ASP  
                 0.280  
                 Plastic  
                 1.660  
                 20.4  
                 88.83  
               
               
                 9  
                   
                 28.878  
                 ASP  
                 −0.150  
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 10  
                 Stop  
                 Plano  
                 0.532  
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 11  
                 Lens 5  
                 −4.310  
                 ASP  
                 0.458  
                 Plastic  
                 1.544  
                 55.9  
                 5.92  
               
               
                 12  
                   
                 −1.911  
                 ASP  
                 0.050  
                   
                   
                   
                   
               
               
                 13  
                 Lens 6  
                 5.677  
                 ASP  
                 0.398  
                 Plastic  
                 1.660  
                 20.4  
                 −15.22  
               
               
                 14  
                   
                 3.526  
                 ASP  
                 0.397  
                   
                   
                   
                   
               
               
                 15  
                 Lens 7  
                 4.166  
                 ASP  
                 0.320  
                 Plastic  
                 1.544  
                 55.9  
                 −4.23  
               
               
                 16  
                   
                 1.442  
                 ASP  
                 0.150  
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 17  
                 Filter  
                 Plano  
                 0.210  
                 Glass  
                 1.517  
                 64.2  
                 — 
               
               
                 18  
                   
                 Plano  
                 0.624  
                   
                   
                   
                   
               
               
                 19  
                 Image  
                 Plano  
                 — 
                   
                   
                   
                   
               
               
                   
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
               
                 Effective radius of Stop on Surface 10 is 1.291 mm. 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 14 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Surface # 
                 2  
                 3  
                 4  
                 5  
                 6  
                 7  
                 8 
               
               
                   
               
               
                 k =  
                 −3.9375E−03  
                 −4.6348E+01  
                 −9.3756E−01  
                 −7.2043E−01  
                 −1.5599E+01  
                 −1.4893E+00  
                 −9.0000E+01  
               
               
                 A4 =   
                 −5.1106E−04  
                  5.6094E−02  
                 −8.5483E−02  
                 −1.3489E−01  
                  7.9114E−02  
                 −3.1653E−02  
                 −1.1296E−01  
               
               
                 A6 =   
                 −9.4003E−03  
                 −8.0936E−02  
                  5.0256E−02  
                  1.1764E−01  
                 −8.1557E−02  
                  1.5753E−03  
                  2.4740E−02  
               
               
                 A8 =   
                  1.6369E−03  
                  4.8519E−02  
                  4.6751E−02  
                 −8.8916E−02  
                  9.1603E−02  
                 −2.9039E−03  
                 −1.0206E−01  
               
               
                 A10 =  
                 −2.1212E−03  
                 −1.6473E−02  
                  3.9952E−02  
                  4.4177E−02  
                 −8.0845E−02  
                 −2.4411E−04  
                  1.3480E−01  
               
               
                 A12 =  
                  3.0256E−05  
                  1.9837E−03  
                 −1.6662E−02  
                 −1.0770E−02  
                  3.9663E−02  
                 −1.8758E−04  
                 −8.3328E−02  
               
               
                 A14 =  
                   
                   
                  2.5021E−03  
                  9.9730E−04  
                 −7.4806E−03  
                  1.0607E−04  
                  2.3937E−02  
               
               
                 A16 =  
                   
                   
                   
                   
                   
                   
                 −2.3326E−03 
               
               
                   
               
               
                 Surface # 
                 9  
                 11  
                 12  
                 13  
                 14  
                 15  
                 16 
               
               
                   
               
               
                 k =  
                 −9.0000E+01  
                 −1.9979E+01  
                 −1.2059E+01  
                 −1.3565E+01  
                 −1.1541E+01  
                 −9.0000E+01  
                 −8.7835E+00  
               
               
                 A4 =   
                 −9.4351E−02  
                 −4.4753E−02  
                 −3.1100E−02  
                  8.0352E−02  
                 −1.5578E−02  
                 −2.9342E−01  
                 −1.7616E−01  
               
               
                 A6 =   
                  3.6894E−02  
                  3.7501E−01  
                  7.4869E−02  
                 −2.8453E−01  
                 −6.0648E−02  
                  1.1975E−01  
                  9.3325E−02  
               
               
                 A8 =   
                 −1.2805E−01  
                 −1.0974E+00  
                 −2.3430E−01  
                  3.1158E−01  
                  3.9206E−02  
                 −1.1313E−02  
                 −3.3245E−02  
               
               
                 A10 =  
                  1.4056E−01  
                  1.6973E+00  
                  3.2495E−01  
                 −2.5525E−01  
                 −1.1695E−02  
                 −6.1699E−03  
                  8.7078E−03  
               
               
                 A12 = 
                 −6.8158E−02  
                 −1.6601E+00  
                 −2.5975E−01  
                  1.5370E−01  
                  1.9127E−04  
                  2.7665E−03  
                 −1.6517E−03  
               
               
                 A14 =  
                  1.0638E−02  
                  1.0190E+00  
                  1.1990E−01  
                 −6.5995E−02  
                  8.7239E−04  
                 −5.5689E−04  
                  2.1258E−04  
               
               
                 A16 =  
                  2.1380E−03  
                 −3.7678E−01  
                 −3.0798E−02  
                  1.7961E−02  
                 −2.3116E−04  
                  6.3637E−05  
                 −1.7117E−05  
               
               
                 A18 =  
                 −6.3511E−04  
                  7.5603E−02  
                  4.0405E−03  
                 −2.6368E−03  
                  2.4083E−05  
                 −3.9570E−06  
                  7.6341E−07  
               
               
                 A20 =  
                   
                 −6.2369E−03  
                 −2.0967E−04  
                  1.5578E−04  
                 −9.1403E−07  
                  1.0311E−07  
                 −1.4211E−08 
               
               
                   
               
            
           
         
       
     
     In the 7th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 7th embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from Table 13 and Table 14 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 7th Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 4.22 
                 f1/f4 
                 0.07 
               
               
                 Fno 
                 1.45 
                 f3/f1 
                 0.83 
               
               
                 HFOV [deg.] 
                 38.5 
                 tan(HFOV) 
                 0.79 
               
               
                 T23/CT2 
                 0.70 
                 f/EPD 
                 1.45 
               
               
                 T67/CT6 
                 1.00 
                 TL/EPD 
                 1.80 
               
               
                 (T23 + T34 + T45 +  
                 16.23 
                 TL/ImgH 
                 1.53 
               
               
                 T67)/(T12 + T56) 
                   
                   
                   
               
               
                 R1/R6 
                 0.09 
                 TL [mm] 
                 5.24 
               
               
                 R4/R1 
                 0.79 
                 SD/TD 
                 0.91 
               
               
                 |R5/R6| 
                 0.11 
                 CRAmax [deg.] 
                 37.35 
               
               
                 R14/R13 
                 0.35 
                 (TL × f)/(EPD × ImgH) 
                 2.22 
               
               
                 R14/EPD 
                 0.50 
                 Yc72/Yc62 
                 0.97 
               
               
                 R3/TD 
                 0.61 
                 Yc72/f 
                 0.23 
               
               
                 |f/f2| 
                 0.53 
               
               
                   
               
            
           
         
       
     
     Furthermore, according to the 7th embodiment, each of at least two of the first lens element  710 , the second lens element  720 , the third lens element  730 , the fourth lens element  740 , the fifth lens element  750 , the sixth lens element  760  and the seventh lens element  770  has an Abbe number which is smaller than 25.0; in detail, the Abbe numbers of the second lens element  720 , the fourth lens element  740  and the sixth lens element  760  are smaller than 25.0. 
     According to the 7th embodiment, a number of inflection points on each of object-side surfaces and image-side surfaces of the first lens element  710 , the second lens element  720 , the third lens element  730 , the fourth lens element  740 , the fifth lens element  750 , the sixth lens element  760  and the seventh lens element  770  is listed as follows. 
     
       
         
           
               
            
               
                   
               
               
                 7th Embodiment-Numbers of inflection points  
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                 710  
                 720  
                 730  
                 740  
                 750  
                 760  
                 770 
               
               
                   
               
               
                 Object-side surface  
                 1  
                 1  
                 0  
                 1  
                 0  
                 2  
                 2  
               
               
                 Image-side surface  
                 1  
                 0  
                 1  
                 1  
                 1  
                 2  
                 1 
               
               
                   
               
            
           
         
       
     
     8th Embodiment 
       FIG.  15    is a schematic view of an imaging apparatus according to the 8th embodiment of the present disclosure.  FIG.  16    shows spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 8th embodiment. In  FIG.  15   , the imaging apparatus includes an image capturing optical system (its reference numeral is omitted) and an image sensor  895 . The image capturing optical system includes, in order from an object side to an image side, an aperture stop  800 , a first lens element  810 , a second lens element  820 , a third lens element  830 , a stop  801 , a fourth lens element  840 , a fifth lens element  850 , a sixth lens element  860 , a seventh lens element  870 , a filter  880  and an image surface  890 , wherein the image sensor  895  is disposed on the image surface  890  of the image capturing optical system. The image capturing optical system includes seven lens elements ( 810 ,  820 ,  830 ,  840 ,  850 ,  860  and  870 ) without additional one or more lens elements inserted between the first lens element  810  and the seventh lens element  870 , and each of the seven lens elements has an object-side surface towards the object side and an image-side surface towards the image side. 
     The first lens element  810  with positive refractive power has an object-side surface  811  being convex in a paraxial region thereof and an image-side surface  812  being concave in a paraxial region thereof. The first lens element  810  is made of a plastic material, and has the object-side surface  811  and the image-side surface  812  being both aspheric. Furthermore, each of the object-side surface  811  and the image-side surface  812  of the first lens element  810  includes at least one inflection point. 
     The second lens element  820  with negative refractive power has an object-side surface  821  being convex in a paraxial region thereof and an image-side surface  822  being concave in a paraxial region thereof. The second lens element  820  is made of plastic material, and has the object-side surface  821  and the image-side surface  822  being both aspheric. Furthermore, each of the object-side surface  821  and the image-side surface  822  of the second lens element  820  includes at least one inflection point. 
     The third lens element  830  with positive refractive power has an object-side surface  831  being convex in a paraxial region thereof and an image-side surface  832  being convex in a paraxial region thereof. The third lens element  830  is made of plastic material, and has the object-side surface  831  and the image-side surface  832  being both aspheric. 
     The fourth lens element  840  with negative refractive power has an object-side surface  841  being convex in a paraxial region thereof and an image-side surface  842  being concave in a paraxial region thereof. The fourth lens element  840  is made of plastic material, and has the object-side surface  841  and the image-side surface  842  being both aspheric. Furthermore, each of the object-side surface  841  and the image-side surface  842  of the fourth lens element  840  includes at least one inflection point. 
     The fifth lens element  850  with positive refractive power has an object-side surface  851  being concave in a paraxial region thereof and an image-side surface  852  being convex in a paraxial region thereof. The fifth lens element  850  is made of plastic material, and has the object-side surface  851  and the image-side surface  852  being both aspheric. Furthermore, the image-side surface  852  of the fifth lens element  850  includes at least one inflection point. 
     The sixth lens element  860  with negative refractive power has an object-side surface  861  being convex in a paraxial region thereof and an image-side surface  862  being concave in a paraxial region thereof. The sixth lens element  860  is made of plastic material, and has the object-side surface  861  and the image-side surface  862  being both aspheric. Furthermore, each of the object-side surface  861  and the image-side surface  862  of the sixth lens element  860  includes at least one inflection point. 
     The seventh lens element  870  with negative refractive power has an object-side surface  871  being convex in a paraxial region thereof and an image-side surface  872  being concave in a paraxial region thereof. The seventh lens element  870  is made of plastic material, and has the object-side surface  871  and the image-side surface  872  being both aspheric. Furthermore, each of the object-side surface  871  and the image-side surface  872  of the seventh lens element  870  includes at least one inflection point. 
     The filter  880  is made of a glass material and located between the seventh lens element  870  and the image surface  890 , and will not affect the focal length of the image capturing optical system. 
     The detailed optical data of the 8th embodiment are shown in Table 15 and the aspheric surface data are shown in Table 16 below. 
     
       
         
           
               
             
               
                 TABLE 15 
               
             
            
               
                   
               
               
                 8th Embodiment 
               
               
                 f = 4.21 mm, Fno = 1.49, HFOV = 38.3 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 Surface 
                   
                   
                   
                   
                   
                   
                   
                 Focal 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 Ape. Stop 
                 Plano 
                 −0.392 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 2 
                 Lens 1 
                 2.248 
                 ASP 
                 0.551 
                 Plastic 
                 1.545 
                 56.0 
                 5.44 
               
               
                 3 
                   
                 8.518 
                 ASP 
                 0.030 
                   
                   
                   
                   
               
               
                 4 
                 Lens 2 
                 2.739 
                 ASP 
                 0.230 
                 Plastic 
                 1.639 
                 23.5 
                 −6.39 
               
               
                 5 
                   
                 1.586 
                 ASP 
                 0.190 
                   
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 2.985 
                 ASP 
                 0.731 
                 Plastic 
                 1.544 
                 55.9 
                 4.28 
               
               
                 7 
                   
                 −9.601 
                 ASP 
                 0.150 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 8 
                 Stop 
                 Plano 
                 0.253 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 9 
                 Lens 4 
                 27.984 
                 ASP 
                 0.280 
                 Plastic 
                 1.639 
                 23.5 
                 −169.37 
               
               
                 10 
                   
                 22.145 
                 ASP 
                 0.360 
                   
                   
                   
                   
               
               
                 11 
                 Lens 5 
                 −2.584 
                 ASP 
                 0.401 
                 Plastic 
                 1.544 
                 55.9 
                 6.14 
               
               
                 12 
                   
                 −1.536 
                 ASP 
                 0.030 
                   
                   
                   
                   
               
               
                 13 
                 Lens 6 
                 5.274 
                 ASP 
                 0.332 
                 Plastic 
                 1.639 
                 23.5 
                 −23.69 
               
               
                 14 
                   
                 3.815 
                 ASP 
                 0.403 
                   
                   
                   
                   
               
               
                 16 
                 Lens 7 
                 29.487 
                 ASP 
                 0.320 
                 Plastic 
                 1.544 
                 55.9 
                 −3.52 
               
               
                 16 
                   
                 1.790 
                 ASP 
                 0.250 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 17 
                 Filter 
                 Plano 
                 0.210 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 18 
                   
                 Plano 
                 0.519 
                   
                   
                   
                   
               
               
                 19 
                 Image 
                 Piano 
                 — 
                   
                   
                   
                   
               
               
                   
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
               
                 Effective radius of Stop on Surface 8 is 1.150 mm 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 16 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Surface # 
                 2 
                 3 
                 4 
                 5 
                 6 
                 7 
                 9 
               
               
                   
               
               
                   k = 
                  4.2275E−03 
                 −2.3940E+00 
                 −2.0676E+00 
                 −8.4062E−01 
                 −1.9798E+01 
                 −1.0000E+00 
                 −9.0000E+01 
               
               
                  A4 = 
                  3.9014E−03 
                  1.7500E−02 
                 −1.2221E−01 
                 −1.6701E−01 
                  7.2314E−02 
                 −3.8904E−02 
                 −1.3447E−01 
               
               
                  A6 = 
                 −1.8376E−02 
                  1.0087E−02 
                  1.4533E−01 
                  1.7783E−01 
                 −4.0161E−02 
                 −3.6532E−04 
                  1.5698E−02 
               
               
                  A8 = 
                  1.4705E−02 
                 −3.5213E−02 
                 −1.5503E−01 
                 −1.7608E−01 
                  2.8964E−02 
                  1.8137E−02 
                 −7.8385E−02 
               
               
                 A10 = 
                 −9.9585E−03 
                  1.6673E−02 
                  8.8993E−02 
                  1.0435E−01 
                 −2.1502E−02 
                 −2.2703E−02 
                  1.5053E−01 
               
               
                 A12 = 
                  1.8463E−03 
                 −2.2315E−03 
                 −2.4448E−02 
                 −3.1058E−02 
                  1.2026E−02 
                  1.5083E−02 
                 −1.1727E−01 
               
               
                 A14 = 
                   
                   
                  2.5490E−03 
                  3.2878E−03 
                 −2.6646E−03 
                 −4.7948E−03 
                  4.2299E−02 
               
               
                 A16 = 
                   
                   
                   
                   
                   
                  5.9091E−04  
                 −5.7556E−03 
               
               
                   
               
               
                 Surface # 
                 10 
                 11 
                 12 
                 13 
                 14 
                 15 
                 16 
               
               
                   
               
               
                   k = 
                 −6.6764E+01 
                 −4.6428E+00 
                 −1.2020E+01 
                 −1.9856E+01 
                 −1.0912E+00 
                 −2.0737E+01 
                 −1.1024E+01 
               
               
                  A4 = 
                 −9.8906E−02 
                  1.3999E−02 
                 −1.1315E−01 
                  7.9398E−02 
                 −7.1374E−02 
                 −2.8812E−01 
                 −1.3611E−01 
               
               
                  A6 = 
                  9.7399E−04 
                  2.8659E−01 
                  2.7411E−01 
                 −3.3442E−01 
                 −2.1044E−02 
                  1.7796E−01 
                  7.9569E−02 
               
               
                  A8 =  
                 −4.6454E−02 
                 −9.1227E−01 
                 −5.2673E−01 
                  3.9646E−01 
                 −9.1022E−03 
                 −9.6184E−02  
                 −3.1575E−02 
               
               
                 A10 = 
                  6.5391E−02 
                  1.3621E+00 
                  6.2338E−01 
                 −3.3007E−01 
                  3.4655E−02 
                  4.3464E−02 
                  8.6731E−03 
               
               
                 A12 = 
                 −2.4554E−02 
                 −1.2549E+00 
                 −4.5025E−01 
                  2.0252E−01 
                  4.5364E−02 
                 −1.2917E−02 
                 −1.6670E−03 
               
               
                 A14 = 
                 −6.8052E−03 
                  7.2913E−01 
                  1.9330E−01 
                 −8.7936E−02 
                  8.9214E−03 
                  2.3453E−03 
                  2.1916E−04 
               
               
                 A16 = 
                  6.3810E−03 
                 −2.6057E−01 
                 −4.7333E−02 
                  2.3858E−02 
                 −1.6623E−03 
                 −2.4970E−04 
                 −1.8738E−05 
               
               
                 A18 = 
                 −1.0612E−03 
                  5.1617E−02 
                  6.0343E−03 
                 −3.4706E−03 
                  1.5711E−04 
                  1.4205E−05 
                  9.3416E−07 
               
               
                 A20 = 
                   
                 −4.2624E−03 
                 −3.0826E−04 
                  2.0321E−04 
                 −5.9203E−06 
                 −3.3095E−07 
                 −2.0408E−08 
               
               
                   
               
            
           
         
       
     
     In the 8th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 8th embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from Table 15 and Table 16 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 8th Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 4.21 
                 f1/f4 
                 −0.03 
               
               
                 Fno 
                 1.49 
                 f3/f1 
                 0.79 
               
               
                 HFOV [deg.] 
                 38.3 
                 tan(HFOV) 
                 0.79 
               
               
                 T23/CT2 
                 0.83 
                 f/EPD 
                 1.49 
               
               
                 T67/CT6 
                 1.21 
                 TL/EPD 
                 1.86 
               
               
                 (T23 + T34 + T45 +  
                 22.60 
                 TL/ImgH 
                 1.53 
               
               
                 T67)/(T12 + T56) 
                   
                   
                   
               
               
                 R1/R6 
                 −0.23 
                 TL [mm] 
                 5.24 
               
               
                 R4/R1 
                 0.71 
                 SD/TD 
                 0.91 
               
               
                 |R5/R6| 
                 0.31 
                 CRAmax [deg.] 
                 39.90 
               
               
                 R14/R13 
                 0.06 
                 (TL × f)/(EPD × ImgH) 
                 2.28 
               
               
                 R14/EPD 
                 0.63 
                 Yc72/Yc62 
                 1.24 
               
               
                 R3/TD 
                 0.64 
                 Yc72/f 
                 0.26 
               
               
                 |f/f2| 
                 0.66 
               
               
                   
               
            
           
         
       
     
     Furthermore, according to the 8th embodiment, each of at least two of the first lens element  810 , the second lens element  820 , the third lens element  830 , the fourth lens element  840 , the fifth lens element  850 , the sixth lens element  860  and the seventh lens element  870  has an Abbe number which is smaller than 25.0; in detail, the Abbe numbers of the second lens element  820 , the fourth lens element  840  and the sixth lens element  860  are smaller than 25.0. 
     According to the 8th embodiment, a number of inflection points on each of object-side surfaces and image-side surfaces of the first lens element  810 , the second lens element  820 , the third lens element  830 , the fourth lens element  840 , the fifth lens element  850 , the sixth lens element  860  and the seventh lens element  870  is listed as follows. 
     
       
         
           
               
            
               
                   
               
               
                 8th Embodiment-Numbers of inflection points 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                 810 
                 820 
                 830 
                 840 
                 850 
                 860 
                 870 
               
               
                   
               
               
                 Object-side surface 
                 1 
                 1 
                 0 
                 1 
                 0 
                 1 
                 2 
               
               
                 Image-side surface 
                 2 
                 1 
                 0 
                 1 
                 1 
                 2 
                 1 
               
               
                   
               
            
           
         
       
     
     9th Embodiment 
       FIG.  17    is a schematic view of an imaging apparatus according to the 9th embodiment of the present disclosure.  FIG.  18    shows spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 9th embodiment. In  FIG.  17   , the imaging apparatus includes an image capturing optical system (its reference numeral is omitted) and an image sensor  995 . The image capturing optical system includes, in order from an object side to an image side, an aperture stop  900 , a first lens element  910 , a second lens element  920 , a third lens element  930 , a stop  901 , a fourth lens element  940 , a fifth lens element  950 , a sixth lens element  960 , a seventh lens element  970 , a filter  980  and an image surface  990 , wherein the image sensor  995  is disposed on the image surface  990  of the image capturing optical system. The image capturing optical system includes seven lens elements ( 910 ,  920 ,  930 ,  940 ,  950 ,  960  and  970 ) without additional one or more lens elements inserted between the first lens element  910  and the seventh lens element  970 , and each of the seven lens elements has an object-side surface towards the object side and an image-side surface towards the image side. 
     The first lens element  910  with positive refractive power has an object-side surface  911  being convex in a paraxial region thereof and an image-side surface  912  being concave in a paraxial region thereof. The first lens element  910  is made of a plastic material, and has the object-side surface  911  and the image-side surface  912  being both aspheric. Furthermore, each of the object-side surface  911  and the image-side surface  912  of the first lens element  910  includes at least one inflection point. 
     The second lens element  920  with negative refractive power has an object-side surface  921  being convex in a paraxial region thereof and an image-side surface  922  being concave in a paraxial region thereof. The second lens element  920  is made of plastic material, and has the object-side surface  921  and the image-side surface  922  being both aspheric. Furthermore, each of the object-side surface  921  and the image-side surface  922  of the second lens element  920  includes at least one inflection point. 
     The third lens element  930  with positive refractive power has an object-side surface  931  being convex in a paraxial region thereof and an image-side surface  932  being convex in a paraxial region thereof. The third lens element  930  is made of plastic material, and has the object-side surface  931  and the image-side surface  932  being both aspheric. 
     The fourth lens element  940  with positive refractive power has an object-side surface  941  being convex in a paraxial region thereof and an image-side surface  942  being concave in a paraxial region thereof. The fourth lens element  940  is made of plastic material, and has the object-side surface  941  and the image-side surface  942  being both aspheric. Furthermore, each of the object-side surface  941  and the image-side surface  942  of the fourth lens element  940  includes at least one inflection point. 
     The fifth lens element  950  with positive refractive power has an object-side surface  951  being concave in a paraxial region thereof and an image-side surface  952  being convex in a paraxial region thereof. The fifth lens element  950  is made of plastic material, and has the object-side surface  951  and the image-side surface  952  being both aspheric. Furthermore, the image-side surface  952  of the fifth lens element  950  includes at least one inflection point. 
     The sixth lens element  960  with negative refractive power has an object-side surface  961  being convex in a paraxial region thereof and an image-side surface  962  being concave in a paraxial region thereof. The sixth lens element  960  is made of plastic material, and has the object-side surface  961  and the image-side surface  962  being both aspheric. Furthermore, each of the object-side surface  961  and the image-side surface  962  of the sixth lens element  960  includes at least one inflection point. 
     The seventh lens element  970  with negative refractive power has an object-side surface  971  being convex in a paraxial region thereof and an image-side surface  972  being concave in a paraxial region thereof. The seventh lens element  970  is made of plastic material, and has the object-side surface  971  and the image-side surface  972  being both aspheric. Furthermore, each of the object-side surface  971  and the image-side surface  972  of the seventh lens element  970  includes at least one inflection point. 
     The filter  980  is made of a glass material and located between the seventh lens element  970  and the image surface  990 , and will not affect the focal length of the image capturing optical system. 
     The detailed optical data of the 9th embodiment are shown in Table 17 and the aspheric surface data are shown in Table 18 below. 
     
       
         
           
               
             
               
                 TABLE 17 
               
             
            
               
                   
               
               
                 9th Embodiment 
               
               
                 f = 4.14 mm, Fno = 1.49, HFOV = 38.7 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                   
                   
                   
                   
                   
                   
                   
                   
                 Focal 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 Ape. Stop 
                 Plano 
                 −0.295 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 2 
                 Lens 1 
                 2.429 
                 ASP 
                 0.560 
                 Plastic 
                 1.545 
                 56.1 
                 5.58 
               
               
                 3 
                   
                 11.071 
                 ASP 
                 0.030 
                   
                   
                   
                   
               
               
                 4 
                 Lens 2 
                 2.965 
                 ASP 
                 0.230 
                 Plastic 
                 1.639 
                 23.5 
                 −5.98 
               
               
                 5 
                   
                 1.619 
                 ASP 
                 0.196 
                   
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 2.798 
                 ASP 
                 0.697 
                 Plastic 
                 1.544 
                 56.0 
                 4.41 
               
               
                 7 
                   
                 −15.412 
                 ASP 
                 −0.039 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 8 
                 Stop 
                 Plano 
                 0.324 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 9 
                 Lens 4 
                 12.989 
                 ASP 
                 0.280 
                 Plastic 
                 1.544 
                 56.0 
                 52.13 
               
               
                 10 
                   
                 23.784 
                 ASP 
                 0.439 
                   
                   
                   
                   
               
               
                 11 
                 Lens 5 
                 −2.727 
                 ASP 
                 0.400 
                 Plastic 
                 1.544 
                 56.0 
                 5.54 
               
               
                 12 
                   
                 −1.506 
                 ASP 
                 0.030 
                   
                   
                   
                   
               
               
                 13 
                 Lens 6 
                 3.849 
                 ASP 
                 0.332 
                 Plastic 
                 1.584 
                 28.2 
                 −13.67 
               
               
                 14 
                   
                 2.515 
                 ASP 
                 0.455 
                   
                   
                   
                   
               
               
                 15 
                 Lens 7 
                 20.511 
                 ASP 
                 0.320 
                 Plastic 
                 1.544 
                 56.0 
                 −3.79 
               
               
                 16 
                   
                 1.862 
                 ASP 
                 0.250 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 17 
                 Filter 
                 Plano 
                 0.210 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 18 
                   
                 Piano 
                 0.529 
                   
                   
                   
                   
               
               
                 19 
                 Image 
                 Plano 
                 — 
                   
                   
                   
                   
               
               
                   
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
               
                 Effective radius of Stop on Surface 8 is 1.210 mm. 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 18 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Surface # 
                 2 
                 3 
                 4 
                 5 
                 6 
                 7 
                 9 
               
               
                   
               
               
                  k = 
                  2.1828E−01 
                  5.3927E+00 
                 −2.0017E+00 
                 −9.2918E−01 
                 −2.4042E+01 
                 −1.0000E+00 
                 −1.0000E+00 
               
               
                  A4 = 
                 −8.9524E−03 
                  1.9654E−02 
                 −9.5379E−02 
                 −1.3836E−01 
                  1.1906E−01 
                 −5.4278E−02 
                 −1.4624E−01 
               
               
                  A6 = 
                 −9.1973E−03 
                 −3.6634E−02 
                  7.4028E−02 
                  1.2391E−01 
                 −1.2593E−01 
                  9.5432E−03 
                  9.1912E−03 
               
               
                  A8 = 
                 −3.8614E−04 
                  6.8633E−03 
                 −8.2103E−02 
                 −1.0356E−01 
                  1.3607E−01 
                  2.5667E−03 
                 −5.8210E−02 
               
               
                 A10 = 
                 −1.5507E−03 
                 −4.3058E−04 
                  5.1979E−02 
                  4.9401E−02 
                 −9.8156E−02 
                 −4.5939E−04 
                  1.0314E−01 
               
               
                 A12 = 
                  9.0707E−05 
                 −1.3236E−06  
                 −1.7515E−02 
                 −1.2619E−02 
                  3.9663E−02 
                   
                 −6.5780E−02 
               
               
                 A14 = 
                   
                   
                  2.5636E−03 
                  1.2775E−03 
                 −6.6583E−03 
                   
                  1.7688E−02 
               
               
                 A16 = 
                   
                   
                   
                   
                   
                   
                 −1.7556E−03 
               
               
                   
               
               
                 Surface # 
                 10 
                 11 
                 12 
                 13 
                 14 
                 15 
                 16 
               
               
                   
               
               
                   k = 
                 −1.5781E+01 
                 −1.4951E+00 
                 −7.4329E+00 
                 −1.0000E+00 
                 −1.0000E+00 
                 −1.0000E+00 
                 −7.1070E+00 
               
               
                  A4 = 
                 −1.0062E−01 
                  2.3163E−02 
                  1.2638E−02 
                  7.2307E−02 
                 −8.7292E−02 
                 −2.1019E−01 
                 −1.4429E−01 
               
               
                  A6 = 
                  1.4504E−02 
                  3.2225E−01 
                  1.8181E−02 
                 −3.6102E−01 
                 −4.5665E−02 
                  4.5449E−02 
                  7.0553E−02 
               
               
                  A8 = 
                 −9.7165E−02 
                 −9.5439E−01 
                 −1.0613E−01 
                  4.5258E−01 
                  4.1596E−02 
                 −1.5448E−03 
                 −2.3702E−02 
               
               
                 A10 = 
                  1.3446E−01 
                  1.3986E+00 
                  1.6758E−01 
                 −3.8085E−01 
                 −1.3924E−02 
                  5.4936E−03 
                  6.5482E−03 
               
               
                 A12 = 
                 −8.4405E−02 
                 −1.2975E+00 
                 −1.5322E−01 
                  2.2048E−01 
                 −7.2240E−04 
                 −3.7705E−03 
                 −1.4792E−03 
               
               
                 A14 = 
                  2.6910E−02 
                  7.5981E−01 
                  7.8887E−02 
                 −8.8092E−02 
                  1.8322E−03 
                  1.0167E−03 
                  2.3933E−04 
               
               
                 A16 = 
                 −4.2991E−03 
                 −2.6944E−01 
                 −2.1924E−02 
                  2.2368E−02 
                 −4.8890E−04 
                 −1.3743E−04 
                 −2.4631E−05 
               
               
                 A18 = 
                  2.6305E−04 
                  5.2078E−02 
                  3.0410E−03 
                 −3.1153E−03 
                  5.2834E−05 
                  9.1862E−06 
                  1.4170E−06 
               
               
                 A20 = 
                   
                 −4.1529E−03 
                 −1.6414E−04 
                  1.7720E−04 
                 −2.0793E−06 
                 −2.4020E−07 
                 −3.4362E−08 
               
               
                   
               
            
           
         
       
     
     In the 9th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 9th embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from Table 17 and Table 18 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 9th Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 4.14 
                 f1/f4 
                 0.11 
               
               
                 Fno 
                 1.49 
                 f3/f1 
                 0.79 
               
               
                 HFOV [deg.] 
                 38.7 
                 tan(HFOV) 
                 0.80 
               
               
                 T23/CT2 
                 0.85 
                 f/EPD 
                 1.49 
               
               
                 T67/CT6 
                 1.37 
                 TL/EPD 
                 1.89 
               
               
                 (T23 + T34 + T45 +  
                 22.92 
                 TL/ImgH 
                 1.53 
               
               
                 T67)/(T12 + T56) 
                   
                   
                   
               
               
                 R1/R6 
                 −0.16 
                 TL [mm] 
                 5.24 
               
               
                 R4/R1 
                 0.67 
                 SD/TD 
                 0.93 
               
               
                 |R5/R6| 
                 0.18 
                 CRAmax [deg.] 
                 41.07 
               
               
                 R14/R13 
                 0.09 
                 (TL × f)/(EPD × ImgH) 
                 2.28 
               
               
                 R14/EPD 
                 0.67 
                 Yc72/Yc62 
                 1.10 
               
               
                 R3/TD 
                 0.70 
                 Yc72/f 
                 0.26 
               
               
                 |f/f2| 
                 0.69 
               
               
                   
               
            
           
         
       
     
     According to the 9th embodiment, a number or inflection points on each or object-side surfaces and image-side surfaces of the first lens element  910 , the second lens element  920 , the third lens element  930 , the fourth lens element  940 , the fifth lens element  950 , the sixth lens element  960  and the seventh lens element  970  is listed as follows. 
     
       
         
           
               
            
               
                   
               
               
                 9th Embodiment-Numbers of inflection points 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                 910 
                 920 
                 930 
                 940 
                 960 
                 960 
                 970 
               
               
                   
               
               
                 Object-side surface 
                 1 
                 1 
                 0 
                 1 
                 0 
                 2 
                 2 
               
               
                 Image-side surface 
                 1 
                 1 
                 0 
                 1 
                 1 
                 2 
                 1 
               
               
                   
               
            
           
         
       
     
     10th Embodiment 
       FIG.  19    is a schematic view of an imaging apparatus according to the 10th embodiment of the present disclosure.  FIG.  20    shows spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 10th embodiment. In  FIG.  19   , the imaging apparatus includes an image capturing optical system (its reference numeral is omitted) and an image sensor  1095 . The image capturing optical system includes, in order from an object side to an image side, an aperture stop  1000 , a first lens element  1010 , a second lens element  1020 , a third lens element  1030 , a stop  1001 , a fourth lens element  1040 , a fifth lens element  1050 , a sixth lens element  1060 , a seventh lens element  1070 , a filter  1080  and an image surface  1090 , wherein the image sensor  1095  is disposed on the image surface  1090  of the image capturing optical system. The image capturing optical system includes seven lens elements ( 1010 ,  1020 ,  1030 ,  1040 ,  1050 ,  1060  and  1070 ) without additional one or more lens elements inserted between the first lens element  1010  and the seventh lens element  1070 , and each of the seven lens elements has an object-side surface towards the object side and an image-side surface towards the image side. 
     The first lens element  1010  with positive refractive power has an object-side surface  1011  being convex in a paraxial region thereof and an image-side surface  1012  being concave in a paraxial region thereof. The first lens element  1010  is made of a plastic material, and has the object-side surface  1011  and the image-side surface  1012  being both aspheric. Furthermore, each of the object-side surface  1011  and the image-side surface  1012  of the first lens element  1010  includes at least one inflection point. 
     The second lens element  1020  with negative refractive power has an object-side surface  1021  being convex in a paraxial region thereof and an image-side surface  1022  being concave in a paraxial region thereof. The second lens element  1020  is made of plastic material, and has the object-side surface  1021  and the image-side surface  1022  being both aspheric. Furthermore, each of the object-side surface  1021  and the image-side surface  1022  of the second lens element  1020  includes at least one inflection point. 
     The third lens element  1030  with positive refractive power has an object-side surface  1031  being convex in a paraxial region thereof and an image-side surface  1032  being convex in a paraxial region thereof. The third lens element  1030  is made of plastic material, and has the object-side surface  1031  and the image-side surface  1032  being both aspheric. Furthermore, the image-side surface  1032  of the third lens element  1030  includes at least one inflection point. 
     The fourth lens element  1040  with negative refractive power has an object-side surface  1041  being concave in a paraxial region thereof and an image-side surface  1042  being concave in a paraxial region thereof. The fourth lens element  1040  is made of plastic material, and has the object-side surface  1041  and the image-side surface  1042  being both aspheric. Furthermore, the image-side surface  1042  of the fourth lens element  1040  includes at least one inflection point. 
     The fifth lens element  1050  with negative refractive power has an object-side surface  1051  being concave in a paraxial region thereof and an image-side surface  1052  being convex in a paraxial region thereof. The fifth lens element  1050  is made of plastic material, and has the object-side surface  1051  and the image-side surface  1052  being both aspheric. Furthermore, the image-side surface  1052  of the fifth lens element  1050  includes at least one inflection point. 
     The sixth lens element  1060  with positive refractive power has an object-side surface  1061  being convex in a paraxial region thereof and an image-side surface  1062  being concave in a paraxial region thereof. The sixth lens element  1060  is made of plastic material, and has the object-side surface  1061  and the image-side surface  1062  being both aspheric. Furthermore, each of the object-side surface  1061  and the image-side surface  1062  of the sixth lens element  1060  includes at least one inflection point. 
     The seventh lens element  1070  with negative refractive power has an object-side surface  1071  being convex in a paraxial region thereof and an image-side surface  1072  being concave in a paraxial region thereof. The seventh lens element  1070  is made of plastic material, and has the object-side surface  1071  and the image-side surface  1072  being both aspheric. Furthermore, each of the object-side surface  1071  and the image-side surface  1072  of the seventh lens element  1070  includes at least one inflection point. 
     The filter  1080  is made of a glass material and located between the seventh lens element  1070  and the image surface  1090 , and will not affect the focal length of the image capturing optical system. 
     The detailed optical data of the 10th embodiment are shown in Table 19 and the aspheric surface data are shown in Table 20 below. 
     
       
         
           
               
             
               
                 TABLE 19 
               
             
            
               
                   
               
               
                 10th Embodiment 
               
               
                 f = 4.16 mm, Fno = 1.49, HFOV = 36.4 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                   
                   
                   
                   
                   
                   
                 Focal 
               
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 Ape. Stop 
                 Plano 
                 −0.572 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 2 
                 Lens 1 
                 1.872 
                 ASP 
                 0.618 
                 Plastic 
                 1.545 
                 56.1 
                 4.94 
               
               
                 3 
                   
                 5.434 
                 ASP 
                 0.030 
                   
                   
                   
                   
               
               
                 4 
                 Lens 2 
                 2.145 
                 ASP 
                 0.230 
                 Plastic 
                 1.639 
                 23.5 
                 −7.15 
               
               
                 5 
                   
                 1.398 
                 ASP 
                 0.177 
                   
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 2.898 
                 ASP 
                 0.617 
                 Plastic 
                 1.544 
                 56.0 
                 4.93 
               
               
                 7 
                   
                 −33.635 
                 ASP 
                 0.027 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 8 
                 Stop 
                 Plano 
                 0.345 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 9 
                 Lens 4 
                 −149.822 
                 ASP 
                 0.280 
                 Plastic 
                 1.660 
                 20.4 
                 −84.42 
               
               
                 10 
                   
                 88.767 
                 ASP 
                 0.184 
                   
                   
                   
                   
               
               
                 11 
                 Lens 5 
                 −2.416 
                 ASP 
                 0.350 
                 Plastic 
                 1.639 
                 23.5 
                 −18.18 
               
               
                 12 
                   
                 −3.223 
                 ASP 
                 0.046 
                   
                   
                   
                   
               
               
                 13 
                 Lens 6 
                 1.775 
                 ASP 
                 0.320 
                 Plastic 
                 1.544 
                 56.0 
                 9.11 
               
               
                 14 
                   
                 2.590 
                 ASP 
                 0.460 
                   
                   
                   
                   
               
               
                 15 
                 Lens 7 
                 2.809 
                 ASP 
                 0.320 
                 Plastic 
                 1.544 
                 56.0 
                 −5.64 
               
               
                 16 
                   
                 1.408 
                 ASP 
                 0.300 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 17 
                 Filter 
                 Plano 
                 0.210 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 18 
                   
                 Plano 
                 0.488 
                   
                   
                   
                   
               
               
                 19 
                 Image 
                 Plano 
                 — 
                   
                   
                   
                   
               
               
                   
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
               
                 Effective radius of Stop on Surface 8 is 1.090 mm. 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 20 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Surface # 
                 2 
                 3 
                 4 
                 5 
                 6 
                 7 
                 9 
               
               
                   
               
               
                   k = 
                 −3.9699E−17 
                 −1.0000E+00 
                 −1.1221E+00 
                 −7.9815E−01 
                 −3.2291E+01 
                 −1.0000E+00 
                 −1.0000E+00 
               
               
                  A4 = 
                  3.2023E−03 
                  1.0870E−02 
                 −9.6081E−02 
                 −1.0433E−01 
                  1.6101E−01 
                 −3.3463E−02 
                 −1.3684E−01 
               
               
                  A6 = 
                 −5.8603E−03 
                  1.3768E−02 
                  2.9833E−02 
                  2.7343E−02 
                 −1.8095E−01 
                 −7.0869E−03 
                 −1.9627E−02 
               
               
                  A8 = 
                  9.9123E−03 
                 −3.8938E−02 
                 −2.6583E−03 
                  3.5560E−02 
                  1.9010E−01 
                  1.3400E−02 
                 −5.0533E−02 
               
               
                 A10 = 
                 −1.4182E−02 
                  4.6011E−02 
                  1.4324E−02 
                 −3.2237E−02 
                 −1.2024E−01 
                 −1.1376E−02 
                  1.2639E−01 
               
               
                 A12 = 
                  8.7406E−03 
                 −2.1121E−02 
                 −1.2738E−02 
                 7.2837E−03 
                  4.1860E−02 
                  5.3028E−03 
                 −8.4128E−02 
               
               
                 A14 = 
                 −2.1594E−03 
                  3.0071E−03 
                  2.8778E−03 
                 −3.7778E−04 
                 −5.7201E−03 
                 −2.4906E−04 
                  1.6556E−02 
               
               
                   
               
               
                 Surface # 
                 10 
                 11 
                 12 
                 13 
                 14 
                 15 
                 16 
               
               
                   
               
               
                   k = 
                  3.3068E−10 
                 −1.0342E+01 
                 −6.3993E+01 
                 −3.8685E+00 
                 −3.1193E+00 
                 −2.2279E+01 
                 −7.6328E+00 
               
               
                  A4 = 
                 −6.6010E−02 
                  1.3547E−01 
                 −2.2973E−01 
                 −1.2403E−01 
                  3.0041E−02 
                 −3.1421E−01 
                 −1.9036E−01 
               
               
                  A6 = 
                 −6.5929E−02 
                 −3.2418E−01 
                  3.7105E−01 
                  5.9350E−02 
                 −1.2412E−01 
                  2.4494E−01 
                  1.3186E−01 
               
               
                  A8 = 
                  3.8348E−03 
                  6.8507E−01 
                 −3.8078E−01  
                 −8.2861E−02 
                  9.0547E−02 
                 −1.3944E−01 
                 −7.0957E−02 
               
               
                 A10 = 
                  2.3859E−02 
                 −1.1145E+00 
                  3.2452E−01 
                  6.0664E−02 
                 −3.9182E−02 
                  5.9963E−02 
                  2.6103E−02 
               
               
                 A12 = 
                 −1.4997E−02 
                  1.1103E+00 
                 −2.2360E−01 
                 −2.3610E−02 
                  1.1073E−02 
                 −1.7983E−02 
                 −6.4425E−03 
               
               
                 A14 = 
                 2.7128E−03 
                 −6.8393E−01 
                  1.0184E−01 
                  4.2513E−03 
                 −2.0419E−03 
                  3.4995E−03 
                  1.0284E−03 
               
               
                 A16 = 
                   
                  2.4355E−01 
                 −2.6846E−02 
                 −1.6125E−04 
                  2.3056E−04 
                 −4.1314E−04 
                 −1.0085E−04 
               
               
                 A18 = 
                   
                 −4.4862E−02 
                  3.6486E−03 
                 −3.9980E−05 
                 −1.4166E−05 
                  2.6617E−05 
                  5.5541E−06 
               
               
                 A20 = 
                   
                  3.2762E−03 
                 −1.9625E−04 
                  3.4595E−06 
                  3.5695E−07 
                 −7.1395E−07 
                 −1.3328E−07 
               
               
                   
               
            
           
         
       
     
     In the 10th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 10th embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from Table 19 and Table 20 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 10th Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 4.15 
                 f1/f4 
                 −0.06 
               
               
                 Fno 
                 1.49 
                 f3/f1 
                 1.00 
               
               
                 HFOV [deg.] 
                 36.4 
                 tan(HFOV) 
                 0.74 
               
               
                 T23/CT2 
                 0.77 
                 f/EPD 
                 1.49 
               
               
                 T67/CT6 
                 1.44 
                 TL/EPD 
                 1.79 
               
               
                 (T23 + T34 + T45 +  
                 15.70 
                 TL/ImgH 
                 1.55 
               
               
                 T67)/(T12 + T56) 
                   
                   
                   
               
               
                 R1/R6 
                 −0.06 
                 TL [mm] 
                 5.00 
               
               
                 R4/R1 
                 0.75 
                 SD/TD 
                 0.86 
               
               
                 |R5/R6| 
                 0.09 
                 CRAmax [deg.] 
                 38.00 
               
               
                 R14/R13 
                 0.50 
                 (TL × f)/(EPD × ImgH) 
                 2.31 
               
               
                 R14/EPD 
                 0.51 
                 Yc72/Yc62 
                 0.79 
               
               
                 R3/TD 
                 0.54 
                 Yc72/f 
                 0.24 
               
               
                 |f/f2| 
                 0.58 
               
               
                   
               
            
           
         
       
     
     Furthermore, according to the 10th embodiment, each of at least two of the first lens element  1010 , the second lens element  1020 , the third lens element  1030 , the fourth lens element  1040 , the fifth lens element  1050 , the sixth lens element  1060  and the seventh lens element  1070  has an Abbe number which is smaller than 25.0; in detail, the Abbe numbers of the second lens element  1020 , the fourth lens element  1040  and the fifth lens element  1050  are smaller than 25.0. 
     According to the 10th embodiment, a number of inflection points on each of object-side surfaces and image-side surfaces of the first lens element  1010 , the second lens element  1020 , the third lens element  1030 , the fourth lens element  1040 , the fifth lens element  1050 , the sixth lens element  1060  and the seventh lens element  1070  is listed as follows. 
     
       
         
           
               
            
               
                   
               
               
                 10th Embodiment-Numbers of inflection points 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                 1010 
                 1020 
                 1030 
                 1040 
                 1050 
                 1060 
                 1070 
               
               
                   
               
               
                 Object-side surface 
                 1 
                 1 
                 0 
                 0 
                 0 
                 1 
                 2 
               
               
                 Image-side surface 
                 1 
                 1 
                 1 
                 1 
                 1 
                 1 
                 2 
               
               
                   
               
            
           
         
       
     
     11th Embodiment 
       FIG.  21    is a schematic view of an imaging apparatus according to the 11th embodiment of the present disclosure.  FIG.  22    shows spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 11th embodiment. In  FIG.  21   , the imaging apparatus includes an image capturing optical system (its reference numeral is omitted) and an image sensor  1195 . The image capturing optical system includes, in order from an object side to an image side, a first lens element  1110 , a second lens element  1120 , an aperture stop  1100 , a third lens element  1130 , a stop  1101 , a fourth lens element  1140 , a fifth lens element  1150 , a sixth lens element  1160 , a seventh lens element  1170 , a filter  1180  and an image surface  1190 , wherein the image sensor  1195  is disposed on the image surface  1190  of the image capturing optical system. The image capturing optical system includes seven lens elements ( 1110 ,  1120 ,  1130 ,  1140 ,  1150 ,  1160  and  1170 ) without additional one or more lens elements inserted between the first lens element  1110  and the seventh lens element  1170 , and each of the seven lens elements has an object-side surface towards the object side and an image-side surface towards the image side. 
     The first lens element  1110  with positive refractive power has an object-side surface  1111  being concave in a paraxial region thereof and an image-side surface  1112  being convex in a paraxial region thereof. The first lens element  1110  is made of a plastic material, and has the object-side surface  1111  and the image-side surface  1112  being both aspheric. Furthermore, each of the object-side surface  1111  and the image-side surface  1112  of the first lens element  1110  includes at least one inflection point. 
     The second lens element  1120  with positive refractive power has an object-side surface  1121  being convex in a paraxial region thereof and an image-side surface  1122  being concave in a paraxial region thereof. The second lens element  1120  is made of plastic material, and has the object-side surface  1121  and the image-side surface  1122  being both aspheric. Furthermore, the image-side surface  1122  of the second lens element  1120  includes at least one inflection point. 
     The third lens element  1130  with negative refractive power has an object-side surface  1131  being convex in a paraxial region thereof and an image-side surface  1132  being concave in a paraxial region thereof. The third lens element  1130  is made of plastic material, and has the object-side surface  1131  and the image-side surface  1132  being both aspheric. Furthermore, the object-side surface  1131  of the third lens element  1130  includes at least one inflection point. 
     The fourth lens element  1140  with positive refractive power has an object-side surface  1141  being convex in a paraxial region thereof and an image-side surface  1142  being convex in a paraxial region thereof. The fourth lens element  1140  is made of plastic material, and has the object-side surface  1141  and the image-side surface  1142  being both aspheric. Furthermore, the object-side surface  1141  of the fourth lens element  1140  includes at least one inflection point. 
     The fifth lens element  1150  with negative refractive power has an object-side surface  1151  being concave in a paraxial region thereof and an image-side surface  1152  being convex in a paraxial region thereof. The fifth lens element  1150  is made of plastic material, and has the object-side surface  1151  and the image-side surface  1152  being both aspheric. Furthermore, each of the object-side surface  1151  and the image-side surface  1152  of the fifth lens element  1150  includes at least one inflection point. 
     The sixth lens element  1160  with positive refractive power has an object-side surface  1161  being convex in a paraxial region thereof and an image-side surface  1162  being concave in a paraxial region thereof. The sixth lens element  1160  is made of plastic material, and has the object-side surface  1161  and the image-side surface  1162  being both aspheric. Furthermore, each of the object-side surface  1161  and the image-side surface  1162  of the sixth lens element  1160  includes at least one inflection point. 
     The seventh lens element  1170  with negative refractive power has an object-side surface  1171  being convex in a paraxial region thereof and an image-side surface  1172  being concave in a paraxial region thereof. The seventh lens element  1170  is made of plastic material, and has the object-side surface  1171  and the image-side surface  1172  being both aspheric. Furthermore, each of the object-side surface  1171  and the image-side surface  1172  of the seventh lens element  1170  includes at least one inflection point. 
     The filter  1180  is made of a glass material and located between the seventh lens element  1170  and the image surface  1190 , and will not affect the focal length of the image capturing optical system. 
     The detailed optical data of the 11th embodiment are shown in Table 21 and the aspheric surface data are shown in Table 22 below. 
     
       
         
           
               
             
               
                 TABLE 21 
               
             
            
               
                   
               
               
                 11th Embodiment 
               
               
                 f = 4.09 mm, Fno = 1.12, HFOV = 37.9 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                   
                   
                   
                   
                   
                   
                   
                   
                 Focal 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 1 
                 Lens 1 
                 −4.785 
                 ASP 
                 1.640 
                 Plastic 
                 1.544 
                 55.9 
                 975.08 
               
               
                 2 
                   
                 −5.315 
                 ASP 
                 0.118 
                   
                   
                   
                   
               
               
                 3 
                 Lens 2 
                 2.609 
                 ASP 
                 1.218 
                 Plastic 
                 1.544 
                 55.9 
                 4.90 
               
               
                 4 
                   
                 102.380 
                 ASP 
                 −0.060 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 5 
                 Ape. Stop 
                 Plano 
                 0.132 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 6 
                 Lens 3 
                 2.944 
                 ASP 
                 0.266 
                 Plastic 
                 1.650 
                 21.4 
                 −9.07 
               
               
                 7 
                   
                 1.893 
                 ASP 
                 0.700 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 8 
                 Stop 
                 Plano 
                 0.100 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 9 
                 Lens 4 
                 7.190 
                 ASP 
                 1.215 
                 Plastic 
                 1.544 
                 55.9 
                 7.12 
               
               
                 10 
                   
                 −7.905 
                 ASP 
                 0.198 
                   
                   
                   
                   
               
               
                 11 
                 Lens 5 
                 −3.012 
                 ASP 
                 0.292 
                 Plastic 
                 1.660 
                 20.4 
                 −7.56 
               
               
                 12 
                   
                 −7.904 
                 ASP 
                 0.070 
                   
                   
                   
                   
               
               
                 13 
                 Lens 6 
                 2.226 
                 ASP 
                 0.526 
                 Plastic 
                 1.535 
                 55.8 
                 6.33 
               
               
                 14 
                   
                 5.963 
                 ASP 
                 0.387 
                   
                   
                   
                   
               
               
                 15 
                 Lens 7 
                 1.535 
                 ASP 
                 0.344 
                 Plastic 
                 1.515 
                 56.5 
                 −10.71 
               
               
                 16 
                   
                 1.109 
                 ASP 
                 0.604 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 17 
                 Filter 
                 Plano 
                 0.300 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 18 
                   
                 Plano 
                 0.152 
                   
                   
                   
                   
               
               
                 19 
                 Image 
                 Plano 
                 — 
                   
                   
                   
                   
               
               
                   
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
               
                 Effective radius of Stop on Surface 8 is 1.763 mm. 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 22 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Surface # 
                 1 
                 2 
                 3 
                 4 
                 5 
                 7 
                 9 
               
               
                   
               
               
                   k = 
                 −9.0562E+00 
                 −4.6828E+00 
                  8.7405E−02 
                 −8.9160E+01 
                 −1.8526E+01 
                 −8.4824E+00 
                 −1.1163E+01 
               
               
                  A3 = 
                 −8.6248E−04 
                  1.4391E−04 
                   
                   
                   
                   
                   
               
               
                  A4 = 
                 −3.9326E−03 
                 −1.0429E−03 
                 −6.7713E−03 
                 −8.4732E−03 
                  2.6788E−02 
                  7.4099E−02 
                 −6.8304E−03 
               
               
                  A5 = 
                  1.8944E−03 
                 −1.8145E−03 
                   
                   
                   
                   
                   
               
               
                  A6 = 
                 −1.2377E−03 
                  3.3890E−03 
                 −6.7049E−04 
                 −6.4840E−03 
                 −5.7500E−02 
                 −8.8577E−02 
                  3.0264E−03 
               
               
                  A7 = 
                  1.0417E−03 
                  6.5406E−04 
                   
                   
                   
                   
                   
               
               
                  A8 = 
                 −3.0819E−04 
                 −1.3946E−03 
                  1.4114E−03 
                  8.6484E−03 
                  5.2807E−02 
                  7.4679E−02 
                 −6.3994E−03 
               
               
                  A9 = 
                  4.3531E−05 
                  2.5913E−04 
                   
                   
                   
                   
                   
               
               
                 A10 = 
                 −2.4024E−05 
                  9.4821E−05 
                 −1.0767E−03 
                 −4.6388E−03 
                 −2.6729E−02 
                 −3.7055E−02 
                  4.5420E−03 
               
               
                 A11 = 
                  1.1651E−05 
                 −8.2252E−06 
                   
                   
                   
                   
                   
               
               
                 A12 = 
                 −2.2147E−06 
                 −1.5379E−05 
                  3.7447E−04 
                  1.3421E−03 
                  7.7134E−03 
                  1.0535E−02 
                 −22192E−03 
               
               
                 A13 = 
                  1.4418E−07 
                  4.5189E−06 
                   
                   
                   
                   
                   
               
               
                 A14 = 
                   
                 −4.4546E−07 
                 −6.6263E−05 
                 −2.0356E−04 
                 −1.1731E−03 
                 −1.4880E−03 
                  5.5156E−04 
               
               
                 A15 = 
                   
                 −2.9800E−08 
                   
                   
                   
                   
                   
               
               
                 A16 = 
                   
                  1.5030E−08 
                  4.7067E−06 
                  1.2757E−05 
                  7.1153E−05 
                  7.2791E−05 
                 −4.9777E−05 
               
               
                   
               
               
                 Surface # 
                 10 
                 11 
                 12 
                 13 
                 14 
                 15 
                 16 
               
               
                   
               
               
                   k = 
                 −5.0356E+01 
                  1.2682E−01 
                 −5.8572E−01 
                 −9.8567E−01 
                 −5.1719E+01 
                 −1.0103E+00 
                 −3.1850E+00 
               
               
                  A3 = 
                   
                   
                   
                   
                   
                 −4.5296E−02 
                 −2.1214E−03 
               
               
                  A4 = 
                 −5.8484E−02 
                 −4.9804E−02 
                 −1.4361E−01 
                 −6.4281E−02 
                  1.1283E−01 
                 −2.5334E−01 
                 −1.5165E−01 
               
               
                  A5 = 
                   
                   
                   
                   
                   
                 −3.0848E−04 
                  2.9316E−03 
               
               
                  A6 = 
                  8.5721E−03 
                  4.3426E−02 
                  1.1426E−01 
                  2.0426E−02 
                 −9.8732E−02 
                  9.3517E−02 
                  6.8228E−02 
               
               
                  A7 = 
                   
                   
                   
                   
                   
                 −6.4006E−05 
                 −4.2874E−05 
               
               
                  A8 = 
                 −8.0382E−03 
                 −2.1892E−02 
                 −5.3551E−02 
                 −2.0452E−02 
                  4.2128E−02 
                 −1.9317E−02 
                 −2.2818E−02 
               
               
                  A9 = 
                   
                   
                   
                   
                   
                  5.7297E−06 
                 −1.3716E−05 
               
               
                 A10 = 
                  7.5305E−03 
                  1.3023E−02 
                  1.9335E−02 
                  9.2781E−03 
                 −1.1660E−02 
                  2.6526E−03 
                  5.1509E−03 
               
               
                 A11 = 
                   
                   
                   
                   
                   
                  5.4323E−07 
                  1.3162E−07 
               
               
                 A12 = 
                 −3.0725E−03 
                 −4.8794E−03 
                 −4.8637E−03 
                 −2.3388E−03 
                  1.9621E−03 
                 −2.4048E−04 
                 −7.2807E−04 
               
               
                 A13 = 
                   
                   
                   
                   
                   
                 8.5096E−09 
                  1.2847E−08 
               
               
                 A14 = 
                  5.7538E−04 
                  9.4158E−04 
                  7.3101E−04 
                  2.3959E−04 
                 −1.7614E−04 
                  1.2951E−05 
                  6.0294E−05 
               
               
                 A15 = 
                   
                   
                   
                   
                   
                 −6.4340E−09 
                  1.9760E−10 
               
               
                 A16 = 
                 −4.2163E−05 
                 −7.3580E−05 
                 −4.7561E−05 
                 −2.6062E−07 
                  6.3958E−06  
                 −3.1259E−07 
                 −2.6297E−06 
               
               
                 A17 = 
                   
                   
                   
                   
                   
                   
                  1.5564E−08 
               
               
                 A18 = 
                   
                   
                   
                   
                   
                   
                  4.0877E−08 
               
               
                   
               
            
           
         
       
     
     In the 11th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment, wherein k represents the conic coefficient of the equation of the aspheric surface profiles, and A3-A18 represent the aspheric coefficients ranging from the 3th order to the 18th order. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 11th embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from Table 21 and Table 22 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 11th Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 4.09 
                 f1/f4 
                 136.92 
               
               
                 Fno 
                 1.12 
                 f3/f1 
                 −0.01 
               
               
                 HFOV [deg.] 
                 37.9 
                 tan(HFOV) 
                 0.78 
               
               
                 T23/CT2 
                 0.06 
                 f/EPD 
                 1.12 
               
               
                 T67/CT6 
                 0.74 
                 TL/EPD 
                 2.25 
               
               
                 (T23 + T34 + T45 +  
                 7.75 
                 TL/ImgH 
                 2.55 
               
               
                 T67)/(T12 + T56) 
                   
                   
                   
               
               
                 R1/R6 
                 −2.53 
                 TL [mm] 
                 8.20 
               
               
                 R4/R1 
                 −21.40 
                 SD/TD 
                 0.59 
               
               
                 |R5/R6| 
                 1.55 
                 CRAmax [deg.] 
                 31.82 
               
               
                 R14/R13 
                 0.72 
                 (TL × f)/(EPD × ImgH) 
                 2.87 
               
               
                 R14/EPD 
                 0.30 
                 Yc72/Yc62 
                 0.94 
               
               
                 R3/TD 
                 0.37 
                 Yc72/f 
                 0.35 
               
               
                 |f/f2| 
                 0.84 
               
               
                   
               
            
           
         
       
     
     Furthermore, according to the 11th embodiment, each of at least two of the first lens element  1110 , the second lens element  1120 , the third lens element  1130 , the fourth lens element  1140 , the fifth lens element  1150 , the sixth lens element  1160  and the seventh lens element  1170  has an Abbe number which is smaller than 25.0; in detail, the Abbe numbers of the third lens element  1130  and the fifth lens element  1150  are smaller than 25.0. 
     According to the 11th embodiment, a number of inflection points on each of object-side surfaces and image-side surfaces of the first lens element  1110 , the second lens element  1120 , the third lens element  1130 , the fourth lens element  1140 , the fifth lens element  1150 , the sixth lens element  1160  and the seventh lens element  1170  is listed as follows. 
     
       
         
           
               
            
               
                   
               
               
                 11th Embodiment-Numbers of inflection points 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                 1110 
                 1120 
                 1130 
                 1140 
                 1150 
                 1160 
                 1170 
               
               
                   
               
               
                 Object-side surface 
                 1 
                 0 
                 1 
                 2 
                 2 
                 2 
                 2 
               
               
                 Image-side surface 
                 1 
                 2 
                 0 
                 0 
                 1 
                 3 
                 1 
               
               
                   
               
            
           
         
       
     
     12th Embodiment 
       FIG.  23    is a schematic view of an imaging apparatus according to the 12th embodiment of the present disclosure.  FIG.  24    shows spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 12th embodiment. In  FIG.  23   , the imaging apparatus includes an image capturing optical system (its reference numeral is omitted) and an image sensor  1295 . The image capturing optical system includes, in order from an object side to an image side, a first lens element  1210 , a second lens element  1220 , an aperture stop  1200 , a third lens element  1230 , a stop  1201 , a fourth lens element  1240 , a fifth lens element  1250 , a sixth lens element  1260 , a seventh lens element  1270 , a filter  1280  and an image surface  1290 , wherein the image sensor  1295  is disposed on the image surface  1290  of the image capturing optical system. The image capturing optical system includes seven lens elements ( 1210 ,  1220 ,  1230 ,  1240 ,  1250 ,  1260  and  1270 ) without additional one or more lens elements inserted between the first lens element  1210  and the seventh lens element  1270 , and each of the seven lens elements has an object-side surface towards the object side and an image-side surface towards the image side. 
     The first lens element  1210  with negative refractive power has an object-side surface  1211  being concave in a paraxial region thereof and an image-side surface  1212  being convex in a paraxial region thereof. The first lens element  1210  is made of a plastic material, and has the object-side surface  1211  and the image-side surface  1212  being both aspheric. Furthermore, each of the object-side surface  1211  and the image-side surface  1212  of the first lens element  1210  includes at least one inflection point. 
     The second lens element  1220  with positive refractive power has an object-side surface  1221  being convex in a paraxial region thereof and an image-side surface  1222  being concave in a paraxial region thereof. The second lens element  1220  is made of plastic material, and has the object-side surface  1221  and the image-side surface  1222  being both aspheric. Furthermore, the image-side surface  1222  of the second lens element  1220  includes at least one inflection point. 
     The third lens element  1230  with negative refractive power has an object-side surface  1231  being convex in a paraxial region thereof and an image-side surface  1232  being concave in a paraxial region thereof. The third lens element  1230  is made of plastic material, and has the object-side surface  1231  and the image-side surface  1232  being both aspheric. Furthermore, the object-side surface  1231  of the third lens element  1230  includes at least one inflection point. 
     The fourth lens element  1240  with positive refractive power has an object-side surface  1241  being convex in a paraxial region thereof and an image-side surface  1242  being convex in a paraxial region thereof. The fourth lens element  1240  is made of plastic material, and has the object-side surface  1241  and the image-side surface  1242  being both aspheric. Furthermore, the object-side surface  1241  of the fourth lens element  1240  includes at least one inflection point. 
     The fifth lens element  1250  with negative refractive power has an object-side surface  1251  being concave in a paraxial region thereof and an image-side surface  1252  being convex in a paraxial region thereof. The fifth lens element  1250  is made of plastic material, and has the object-side surface  1251  and the image-side surface  1252  being both aspheric. Furthermore, each of the object-side surface  1251  and the image-side surface  1252  of the fifth lens element  1250  includes at least one inflection point. 
     The sixth lens element  1260  with positive refractive power has an object-side surface  1261  being convex in a paraxial region thereof and an image-side surface  1262  being concave in a paraxial region thereof. The sixth lens element  1260  is made of plastic material, and has the object-side surface  1261  and the image-side surface  1262  being both aspheric. Furthermore, each of the object-side surface  1261  and the image-side surface  1262  of the sixth lens element  1260  includes at least one inflection point. 
     The seventh lens element  1270  with negative refractive power has an object-side surface  1271  being convex in a paraxial region thereof and an image-side surface  1272  being concave in a paraxial region thereof. The seventh lens element  1270  is made of plastic material, and has the object-side surface  1271  and the image-side surface  1272  being both aspheric. Furthermore, each of the object-side surface  1271  and the image-side surface  1272  of the seventh lens element  1270  includes at least one inflection point. 
     The filter  1280  is made of a glass material and located between the seventh lens element  1270  and the image surface  1290 , and will not affect the focal length of the image capturing optical system. 
     The detailed optical data of the 12th embodiment are shown in Table 23 and the aspheric surface data are shown in Table 24 below. 
     
       
         
           
               
             
               
                 TABLE 23 
               
             
            
               
                   
               
               
                 12th Embodiment 
               
               
                 f = 3.40 mm, Fno = 1.17, HFOV = 38.7 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                   
                   
                   
                   
                   
                   
                   
                   
                 Focal 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 1 
                 Lens 1 
                 −4.276 
                 ASP 
                 1.408 
                 Plastic 
                 1.544 
                 55.9 
                 −1511.84 
               
               
                 2 
                   
                 −4.797 
                 ASP 
                 0.100 
                   
                   
                   
                   
               
               
                 3 
                 Lens 2 
                 2.123 
                 ASP 
                 0.998 
                 Plastic 
                 1.544 
                 55.9 
                 3.99 
               
               
                 4 
                   
                 78.298 
                 ASP 
                 −0.045 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 5 
                 Ape. Stop 
                 Plano 
                 0.105 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 6 
                 Lens 3 
                 2.568 
                 ASP 
                 0.220 
                 Plastic 
                 1.650 
                 21.4 
                 −7.57 
               
               
                 7 
                   
                 1.630 
                 ASP 
                 0.579 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 8 
                 Stop 
                 Plano 
                 0.100 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 9 
                 Lens 4 
                 6.012 
                 ASP 
                 0.964 
                 Plastic 
                 1.544 
                 55.9 
                 6.00 
               
               
                 10 
                   
                 −6.735 
                 ASP 
                 0.159 
                   
                   
                   
                   
               
               
                 11 
                 Lens 5 
                 −2.511 
                 ASP 
                 0.239 
                 Plastic 
                 1.660 
                 20.4 
                 −6.49 
               
               
                 12 
                   
                 −6.296 
                 ASP 
                 0.077 
                   
                   
                   
                   
               
               
                 13 
                 Lens 6 
                 1.967 
                 ASP 
                 0.491 
                 Plastic 
                 1.535 
                 55.8 
                 4.90 
               
               
                 14 
                   
                 7.209 
                 ASP 
                 0.259 
                   
                   
                   
                   
               
               
                 15 
                 Lens 7 
                 1.345 
                 ASP 
                 0.296 
                 Plastic 
                 1.514 
                 56.8 
                 −6.88 
               
               
                 16 
                   
                 0.902 
                 ASP 
                 0.500 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 17 
                 Filter 
                 Plano 
                 0.300 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 18 
                   
                 Piano 
                 0.102 
                   
                   
                   
                   
               
               
                 19 
                 Image 
                 Plano 
                 — 
                   
                   
                   
                   
               
               
                   
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
               
                 Effective radius of Stop on Surface 8 is 1.429 mm. 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 24 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Surface # 
                 1 
                 2 
                 3 
                 4 
                 6 
                 7 
                 9 
               
               
                   
               
               
                   k = 
                 −1.0336E+01 
                 −4.8911E+00 
                  7.5182E−02 
                 −8.9163E+01 
                 −1.8836E+01 
                 −8.3693E+00 
                 −1.3965E+01 
               
               
                  A4 = 
                 −6.1168E−03 
                 −4.1378E−03 
                 −1.6214E−02 
                 −2.5152E−02 
                  2.8691E−02 
                  1.1666E−01 
                 −1.3971E−02 
               
               
                  A6 = 
                  2.2705E−03 
                  8.0834E−03 
                  3.3299E−03 
                  1.1885E−03 
                 −1.0962E−01 
                 −2.0328E−01 
                  2.2231E−03 
               
               
                  A8 = 
                 −3.3810E−04 
                 −3.3598E−03 
                  1.2189E−04 
                  1.4917E−02 
                  1.6781E−01 
                  2.8203E−01 
                 −9.7267E−03 
               
               
                 A10 = 
                  3.6591E−05 
                  9.3720E−04 
                 −2.9601E−03 
                 −1.5655E−02 
                 −1.3755E−01 
                 −2.3466E−01 
                  6.2497E−03 
               
               
                 A12 = 
                 −2.4815E−06 
                 −1.4074E−04 
                  2.1243E−03 
                  7.8294E−03 
                  6.3950E−02 
                  1.1545E−01 
                 −5.7454E−03 
               
               
                 A14 = 
                  7.5194E−08 
                  9.2973E−06 
                 −6.7329E−04 
                 −1.9759E−03 
                 −1.5691E−02 
                 −2.9794E−02 
                  2.8747E−03 
               
               
                 A16 = 
                   
                   
                  8.3676E−05 
                  2.0347E−04 
                  1.5220E−03 
                  2.9933E−03  
                 −4.5591E−04 
               
               
                   
               
               
                 Surface # 
                 10 
                 11 
                 12 
                 13 
                 14 
                 15 
                 16 
               
               
                   
               
               
                   k = 
                 −3.6640E+01 
                  1.4660E−01 
                 −3.2016E+00 
                 −9.8537E−01 
                 −7.5094E+01 
                 −1.0504E+00 
                 −3.2084E+00 
               
               
                  A3 = 
                   
                   
                   
                   
                   
                 −5.4324E−02 
                 −8.0092E−03 
               
               
                  A4 = 
                 −1.0230E−01 
                 −9.9460E−02 
                 −2.5508E−01 
                 −1.0658E−01 
                  2.0337E−01 
                 −4.4762E−01 
                 −2.6934E−01 
               
               
                  A5 = 
                   
                   
                   
                   
                   
                  9.3715E−05 
                  5.1347E−03 
               
               
                  A6 = 
                  1.7852E−02 
                  1.4157E−01 
                  3.0897E−01 
                  5.2130E−02 
                 −2.4862E−01 
                  2.4081E−01 
                  1.7496E−01 
               
               
                  A7 = 
                   
                   
                   
                   
                   
                 −1.8195E−04 
                 −7.5449E−05 
               
               
                  A8 = 
                 −3.2106E−02 
                 −1.1147E−01 
                 −2.1989E−01 
                 −7.7200E−02 
                  1.5320E−01 
                 −7.2523E−02 
                 −8.5645E−02 
               
               
                  A9 = 
                   
                   
                   
                   
                   
                  1.8592E−05 
                 −6.2764E−05 
               
               
                 A10 = 
                  4.6440E−02 
                  8.6512E−02 
                  1.1809E−01 
                  5.0769E−02 
                 −6.1761E−02 
                  1.4527E−02 
                  2.8214E−02 
               
               
                 A11 = 
                   
                   
                   
                   
                   
                  2.2374E−06 
                  1.9051E−07 
               
               
                 A12 = 
                 −2.8027E−02 
                 −4.3259E−02 
                 −4.3563E−02 
                 −1.8679E−02 
                  1.5190E−02 
                 −1.9227E−03 
                 −5.8200E−03 
               
               
                 A13 = 
                   
                   
                   
                   
                   
                 −1.7478E−08 
                  5.4506E−08 
               
               
                 A14 = 
                  7.7524E−03 
                  1.1563E−02 
                  9.5340E−03 
                  2.8080E−03 
                 −1.9942E−03 
                  1.5107E−04 
                  7.0330E−04 
               
               
                 A15 = 
                   
                   
                   
                   
                   
                 −7.1949E−08 
                  1.2170E−10 
               
               
                 A16 = 
                 −8.4493E−04 
                 −1.2801E−03 
                 −9.0280E−04 
                 −5.2037E−06 
                  1.0596E−04 
                 −5.3059E−06 
                 −4.4355E−05 
               
               
                 A17 = 
                   
                   
                   
                   
                   
                   
                 −5.0357E−09 
               
               
                 A18 = 
                   
                   
                   
                   
                   
                   
                  1.0820E−06 
               
               
                   
               
            
           
         
       
     
     In the 12th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment, wherein k represents the conic coefficient of the equation of the aspheric surface profiles, and A3-A18 represent the aspheric coefficients ranging from the 3th order to the 18th order. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 12th embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from Table 23 and Table 24 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 12th Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 3.40 
                 f1/f4 
                 −252.09 
               
               
                 Fno 
                 1.17 
                 f3/f1 
                 0.01 
               
               
                 HFOV [deg.] 
                 38.7 
                 tan(HFOV) 
                 0.80 
               
               
                 T23/CT2 
                 0.06 
                 f/EPD 
                 1.17 
               
               
                 T67/CT6 
                 0.53 
                 TL/EPD 
                 2.36 
               
               
                 (T23 + T34 + T45 +  
                 6.54 
                 TL/ImgH 
                 2.45 
               
               
                 T67)/(T12 + T56) 
                   
                   
                   
               
               
                 R1/R6 
                 −2.62 
                 TL [mm] 
                 6.85 
               
               
                 R4/R1 
                 −18.31 
                 SD/TD 
                 0.59 
               
               
                 |R5/R6| 
                 1.58 
                 CRAmax [deg.] 
                 33.45 
               
               
                 R14/R13 
                 0.67 
                 (TL × f)/(EPD × ImgH) 
                 2.86 
               
               
                 R14/EPD 
                 0.31 
                 Yc72/Yc62 
                 0.95 
               
               
                 R3/TD 
                 0.36 
                 Yc72/f 
                 0.36 
               
               
                 |f/f2| 
                 0.85 
               
               
                   
               
            
           
         
       
     
     Furthermore, according to the 12th embodiment, each of at least two of the first lens element  1210 , the second lens element  1220 , the third lens element  1230 , the fourth lens element  1240 , the fifth lens element  1250 , the sixth lens element  1260  and the seventh lens element  1270  has an Abbe number which is smaller than 25.0; in detail, the Abbe numbers of the third lens element  1230  and the fifth lens element  1250  are smaller than 25.0. 
     According to the 12th embodiment, a number of inflection points on each of object-side surfaces and image-side surfaces of the first lens element  1210 , the second lens element  1220 , the third lens element  1230 , the fourth lens element  1240 , the fifth lens element  1250 , the sixth lens element  1260  and the seventh lens element  1270  is listed as follows. 
     
       
         
           
               
            
               
                   
               
               
                 12th Embodiment-Numbers of inflection points 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                 1210 
                 1220 
                 1230 
                 1240 
                 1250 
                 1260 
                 1270 
               
               
                   
               
               
                 Object-side surface 
                 1 
                 0 
                 1 
                 2 
                 2 
                 2 
                 3 
               
               
                 Image-side surface 
                 1 
                 2 
                 0 
                 0 
                 1 
                 3 
                 1 
               
               
                   
               
            
           
         
       
     
     13th Embodiment 
       FIG.  27    is a three-dimensional schematic view of an imaging apparatus  10  according to the 13th embodiment of the present disclosure. In  FIG.  27   , the imaging apparatus  10  of the 13th embodiment is a camera module, the imaging apparatus  10  includes an imaging lens assembly  11 , a driving apparatus  12  and an image sensor  13 , wherein the imaging lens assembly  11  includes the image capturing optical system of the 1st embodiment and a lens barrel (not shown in drawings) for carrying the image capturing optical system. The imaging apparatus  10  can focus light from an imaged object via the imaging lens assembly  11 , perform image focusing by the driving apparatus  12 , and generate an image on the image sensor  13 , and the imaging information can be transmitted. 
     The driving apparatus  12  can be an auto-focus module, which can be driven by driving systems, such as voice coil motors (VCM), micro electro-mechanical systems (MEMS), piezoelectric systems, and shape memory alloys etc. The image capturing optical system can obtain a favorable imaging position by the driving apparatus  12  so as to capture clear images when the imaged object is disposed at different object distances. 
     The imaging apparatus  10  can include the image sensor  13  disposed on the image surface of the image capturing optical system, such as CMOS and CCD, which has superior photosensitivity and low noise, thus it is favorable for providing realistic images with high definition image quality thereof. 
     Moreover, the imaging apparatus  10  can further include an image stabilization module  14 , which can be a kinetic energy sensor, such as an accelerometer, a gyroscope, and a Hall effect sensor. In the 13th embodiment, the image stabilization module  14  is a gyroscope, but is not limited thereto. Therefore, the variation of different axial directions of the image capturing optical system can adjusted so as to compensate the image blur generated by motion at the moment of exposure, and it is further favorable for enhancing the image quality while photographing in motion and low light situation. Furthermore, advanced image compensation functions, such as optical image stabilizations (OIS) and electronic image stabilizations (EIS) etc., can be provided. 
     14th Embodiment 
       FIG.  28 A  is a schematic view of one side of an electronic device  20  according to the 14th embodiment of the present disclosure.  FIG.  28 B  is a schematic view of another side of the electronic device  20  of  FIG.  28 A .  FIG.  28 C  is a system schematic view of the electronic device  20  of  FIG.  28 A . In  FIGS.  28 A,  28 B and  28 C , the electronic device  20  according to the 14th embodiment is a smartphone; the electronic device  20  includes the imaging apparatus  10 , a flash module  21 , a focusing assisting module  22 , an image signal processor  23 , a user interface  24  and an image software processor  25 . When the user captures images of an imaged object  26  via the user interface  24 , the electronic device  20  focuses and generates an image via the imaging apparatus  10  while compensating for low illumination via the flash module  21 . Then, the electronic device  20  quickly focuses on the imaged object according to its object distance information provided by the focusing assisting module  22 , and optimizes the image via the image signal processor  23  (ISP) and the image software processor  25 . Thus, the image quality can be further enhanced. The focusing assisting module  22  can adopt infrared or laser for obtaining quick focusing, and the user interface  24  can utilize a touch screen or a physical button for capturing and processing the image with various functions of the image processing software. 
     The imaging apparatus  10  according to the 14th embodiment is the same as the imaging apparatus  10  according to the 13th embodiment, and will not describe again herein. 
     15th Embodiment 
       FIG.  29    is a schematic view of an electronic device  30  according to the 15th embodiment of the present disclosure. The electronic device  30  of the 15th embodiment is a tablet personal computer, wherein the electronic device  30  includes an imaging apparatus  31 , wherein the imaging apparatus  31  is the same as stated in the 13th embodiment, and will not describe again herein. 
     16th Embodiment 
       FIG.  30    is a schematic view of an electronic device  40  according to the 16th embodiment of the present disclosure. The electronic device  40  of the 16th embodiment is a wearable device, wherein the electronic device  40  includes an imaging apparatus  41 , wherein the imaging apparatus  41  is the same as stated in the 13th embodiment, and will not describe again herein. 
     The foregoing description, for purpose of explanation, has been described with reference to specific embodiments. It is to be noted that Tables 1-24 show different data of the different embodiments; however, the data of the different embodiments are obtained from experiments. The embodiments were chosen and described in order to best explain the principles of the disclosure and its practical applications, to thereby enable others skilled in the art to best utilize the disclosure and various embodiments with various modifications as are suited to the particular use contemplated. The embodiments depicted above and the appended drawings are exemplary and are not intended to be exhaustive or to limit the scope of the present disclosure to the precise forms disclosed. Many modifications and variations are possible in view of the above teachings.