Patent Publication Number: US-9411133-B1

Title: Imaging lens system, image capturing device and electronic device

Description:
RELATED APPLICATIONS 
     This application claims priority to Taiwan Application Serial Number 104103389, filed Feb. 2, 2015, which is incorporated by reference herein in its entirety. 
     BACKGROUND 
     1. Technical Field 
     The present disclosure relates to an imaging lens system and an image capturing device, and more particularly, to an imaging lens system and an image capturing device applicable to electronic devices. 
     2. Description of Related Art 
     As personal electronic products have been becoming more and more compact, the internal components of the electronic products are also required to be smaller in size than before, resulting in an increasing demand for compact imaging lens systems. In addition to the demand of miniaturization, the reduction of the pixel size of sensors in the advancement of semiconductor manufacturing technologies has enabled imaging lens systems to evolve toward the field of higher megapixels. Meanwhile, the popularity of smart phones and tablet computers greatly boosts the need for compact imaging lens systems featuring high image quality. 
     A conventional telephoto optical system generally adopts a multi-element structure and comprises glass lens elements with spherical surfaces. Such a configuration not only results in a bulky optical system with low portability, but the arrangement of refractive power causes problems such as poor convergent performance of the light beam, aberrations and chromatic aberrations. Moreover, the improper configuration of the spacing between and thicknesses of the lens elements may lead to the problem of insufficient space for the light beam to travel therebetween, thereby causing aberrations and high order aberrations. 
     Therefore, a need exists in the art for an imaging lens system that features a compact size and high image quality. 
     SUMMARY 
     According to one aspect of the present disclosure, an imaging lens system includes, in order from an object side to an image side: a first lens element with positive refractive power having an object-side surface being convex in a paraxial region thereof; a second lens element with negative refractive power; a third lens element with refractive power; a fourth lens element with refractive power, an object-side surface and an image-side surface thereof being aspheric; and a fifth lens element with refractive power having an object-side surface being convex in a paraxial region thereof, the object-side surface and an image-side surface thereof being aspheric and at least one of which being provided with at least one inflection point; wherein the imaging lens system is further provided with a stop, and no lens element with refractive power is disposed between the stop and the first lens element; wherein the imaging lens system has a total of five lens elements with refractive power; wherein 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, a central thickness of the second lens element is CT2, a central thickness of the third lens element is CT3, a central thickness of the fourth lens element is CT4, a central thickness of the fifth lens element is CT5, a focal length of the imaging lens system is f, a focal length of the first lens element is f1, a focal length of the second lens element is f2, a focal length of the fourth lens element is f4, a focal length of the fifth lens element is f5, an axial distance between the stop and the image-side surface of the fifth lens element is SD, an axial distance between the object-side surface of the first lens element and the image-side surface of the fifth lens element is TD, and the following conditions are satisfied:
 
0.90&lt;( T 23+ T 34)/(CT3+CT4+CT5);
 
(| f/f 4|+| f/f 5|)/(| f/f 1|+| f/f 2|)&lt;0.60;
 
0.7&lt; SD/TD&lt; 1.1; and
 
1.0&lt;(CT2+CT4)/(CT2−CT4).
 
     According to another aspect of the present disclosure, an image capturing device includes the aforementioned imaging lens system and an image sensor. 
     According to another aspect of the present disclosure, an electronic device includes the aforementioned image capturing device. 
     According to another aspect of the present disclosure, an imaging lens system includes, in order from an object side to an image side: a first lens element with positive refractive power having an object-side surface being convex in a paraxial region thereof; a second lens element with negative refractive power having an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof; a third lens element with refractive power; a fourth lens element with negative refractive power, an object-side surface and an image-side surface thereof being aspheric; and a fifth lens element with refractive power having an image-side surface being concave in a paraxial region thereof, an object-side surface and the image-side surface thereof being aspheric and at least one of which being provided with at least one inflection point; wherein the imaging lens system is further provided with a stop, and no lens element with refractive power is disposed between the stop and the first lens element; wherein the imaging lens system has a total of five lens elements with refractive power; wherein 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, a central thickness of the third lens element is CT3, a central thickness of the fourth lens element is CT4, a central thickness of the fifth lens element is CT5, a focal length of the imaging lens system is f, a focal length of the first lens element is f1, a focal length of the second lens element is f2, a focal length of the fourth lens element is f4, a focal length of the fifth lens element is f5, an axial distance between the stop and the image-side surface of the fifth lens element is SD, an axial distance between the object-side surface of the first lens element and the image-side surface of the fifth lens element is TD, and the following conditions are satisfied:
 
0.90&lt;( T 23+ T 34)/(CT3+CT4+CT5);
 
(| f/f 4|+| f/f 5|)/(| f/f 1|+| f/f 2|)&lt;1.0;
 
0.7&lt; SD/TD&lt; 1.1; and
 
0.3&lt;CT4/CT3&lt;2.5.
 
     According to another aspect of the present disclosure, an imaging lens system includes, in order from an object side to an image side: a first lens element with positive refractive power having an object-side surface being convex in a paraxial region thereof; a second lens element with negative refractive power; a third lens element with refractive power; a fourth lens element with negative refractive power having an object-side surface being concave in a paraxial region thereof, the object-side surface and an image-side surface thereof being aspheric; and a fifth lens element with refractive power having an image-side surface being concave in a paraxial region thereof, an object-side surface and the image-side surface thereof being aspheric and at least one of which being provided with at least one inflection point; wherein the imaging lens system is further provided with a stop, and no lens element with refractive power is disposed between the stop and the first lens element; wherein the imaging lens system has a total of five lens elements with refractive power; wherein 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, a central thickness of the third lens element is CT3, a central thickness of the fourth lens element is CT4, a central thickness of the fifth lens element is CT5, a focal length of the imaging lens system is f, a focal length of the first lens element is f1, a focal length of the second lens element is f2, a focal length of the fourth lens element is f4, a focal length of the fifth lens element is f5, an axial distance between the stop and the image-side surface of the fifth lens element is SD, an axial distance between the object-side surface of the first lens element and the image-side surface of the fifth lens element is TD, and the following conditions are satisfied:
 
0.90&lt;( T 23+ T 34)/(CT3+CT4+CT5);
 
(| f/f 4|+| f/f 5|)/(| f/f 1|+| f/f 2|)&lt;1.0;
 
0.7&lt; SD/TD&lt; 1.1; and
 
0.3&lt;CT4/CT3&lt;2.5.
 
     In any of the aforementioned imaging lens systems of the present disclosure, the first lens element is configured to have positive refractive power so as to enhance the convergent performance of the light beam and to effectively control the total track length of the imaging lens system, and the second lens element has negative refractive power so as to favorably correct the aberration created by the first lens element and the chromatic aberration at the same time. Moreover, the arrangement of the first lens element with positive refractive power and the second lens element with negative refractive power is favorable for forming a telephoto structure so that certain area has a higher resolution. 
     When (T23+T34)/(CT3+CT4+CT5) satisfies the above condition, the adjustment of the spacings between lens elements in the middle of the imaging lens system and the thickness(es) of the lens element(s) close to the image-side end provides a sufficient space for the light beam and thereby to correct the aberration created due to constricted space. 
     When SD/TD satisfies the above condition, the total track length of the imaging lens system can be effectively reduced to prevent the imaging lens system from being too bulky while the incident angle of the light is controlled. 
     When (|f/f4|+|f/f5|)/(|f/f1|+|f/f2|) satisfies the above condition, the imaging lens system&#39;s control capability at the region close to the object-side end can be reinforced, and the lens element at the image-side end has an enhanced performance in correcting high order aberrations. 
     When (CT2+CT4)/(CT2−CT4) satisfies the above condition, the effective optical path length of the second lens element can be enhanced, and it is favorable for mitigating the distribution of the refractive power of the fourth lens element to correct the aberration at the periphery of the imaging lens system, thereby obtaining a better image quality of a distant view image. 
     When CT4/CT3 satisfies the above condition, the thicknesses of the lens elements can be effectively controlled to improve the manufacturability of the product and reduce the sensitivity. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1A  is a schematic view of an image capturing device according to the first embodiment of the present disclosure; 
         FIG. 1B  shows longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing device according to the first embodiment; 
         FIG. 2A  is a schematic view of an image capturing device according to the second embodiment of the present disclosure; 
         FIG. 2B  shows longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing device according to the second embodiment; 
         FIG. 3A  is a schematic view of an image capturing device according to the third embodiment of the present disclosure; 
         FIG. 3B  shows longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing device according to the third embodiment; 
         FIG. 4A  is a schematic view of an image capturing device according to the fourth embodiment of the present disclosure; 
         FIG. 4B  shows longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing device according to the fourth embodiment; 
         FIG. 5A  is a schematic view of an image capturing device according to the fifth embodiment of the present disclosure; 
         FIG. 5B  shows longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing device according to the fifth embodiment; 
         FIG. 6A  is a schematic view of an image capturing device according to the sixth embodiment of the present disclosure; 
         FIG. 6B  shows longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing device according to the sixth embodiment; 
         FIG. 7A  is a schematic view of an image capturing device according to the seventh embodiment of the present disclosure; 
         FIG. 7B  shows longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing device according to the seventh embodiment; 
         FIG. 8A  is a schematic view of an image capturing device according to the eighth embodiment of the present disclosure; 
         FIG. 8B  shows longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing device according to the eighth embodiment; 
         FIG. 9A  is a schematic view of an image capturing device according to the ninth embodiment of the present disclosure; 
         FIG. 9B  shows longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing device according to the ninth embodiment; 
         FIG. 10A  is a schematic view of an image capturing device according to the tenth embodiment of the present disclosure; 
         FIG. 10B  shows longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing device according to the tenth embodiment; 
         FIG. 11A  shows a smart phone with an image capturing device of the present disclosure installed therein; 
         FIG. 11B  shows a tablet personal computer with an image capturing device of the present disclosure installed therein; and 
         FIG. 11C  shows a wearable device with an image capturing device of the present disclosure installed therein. 
         FIG. 12  shows the critical point according to the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     The present disclosure provides an imaging lens system including, 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, and a fifth lens element, wherein the imaging lens system has a total of five lens elements with refractive power. The imaging lens system is further provided with a stop, and no lens element with refractive power is disposed between the stop and the first lens element. 
     The first lens element has positive refractive power so that it provides the imaging lens system with part of positive refractive power as it needs to be to favorably enhance the convergent performance of the light beam, thereby effectively controlling the total track length of the imaging lens system. The object-side surface of the first lens element is convex in a paraxial region thereof so that the distribution of the positive refractive power can be adjusted and thereby to shorten the total track length. 
     The second lens element has negative refractive power, so that it is favorable for correcting the aberration created by the first lens element and the chromatic aberration at the same time. The object-side surface of the second lens element may be convex in a paraxial region thereof and the image-side surface of the second lens element may be concave in a paraxial region thereof so as to favorably correct the astigmatism. The arrangement of the first lens element with positive refractive power and the second lens element with negative refractive power is more favorable for forming a telephoto structure so that certain area has a higher resolution. 
     The third lens element may have positive refractive power, so that it is favorable for balancing the distribution of the refractive power of the imaging lens system and thereby to reduce the sensitivity of the imaging lens system. At least one of the object-side surface and the image-side surface of the third lens element may be provided with at least one inflection point so as to favorably correct the aberration of the off-axis field and to suppress the incident angle of the light projecting onto an image sensor from the off-axis field to increase the receiving efficiency of the image sensor. The curvature radiuses of the object-side surface and the image-side surface of the third lens element are both either positive or negative so as to enhance the capability of correcting the astigmatism. 
     The fourth lens element may have negative refractive power. The object-side surface of the fourth lens element may be concave in a paraxial region thereof and the image-side surface of the fourth lens element may be convex in a paraxial region thereof so as to favorably correct the astigmatism and thereby to improve the image quality. 
     The fifth lens element may have negative refractive power so that the back focal length of the imaging lens system can be favorably reduced to keep the imaging lens system compact. The object-side surface of the fifth lens element may be convex in a paraxial region thereof and the image-side surface of the fifth lens element may be concave in a paraxial region thereof so as to facilitate further correction of the aberration. At least one of the object-side surface and the image-side surface of the fifth lens element is provided with at least one inflection point so as to effectively correct the aberration of the off-axis field. 
     When 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, a central thickness of the third lens element is CT3, a central thickness of the fourth lens element is CT4, a central thickness of the fifth lens element is CT5, and the following condition is satisfied: 0.90&lt;(T23+T34)/(CT3+CT4+CT5), the adjustment of the spacings between lens elements in the middle of the imaging lens system and the thickness(es) of the lens element(s) close to the image-side end provides a sufficient space for the light beam and thereby to correct the aberration created due to constricted space. Preferably, the following condition is satisfied: 1.0&lt;(T23+T34)/(CT3+CT4+CT5), and most preferably, the following condition is satisfied: 1.15&lt;(T23+T34)/(CT3+CT4+CT5). 
     When a focal length of the imaging lens system is f, a focal length of the first lens element is f1, a focal length of the second lens element is f2, a focal length of the fourth lens element is f4, a focal length of the fifth lens element is f5, and the following condition is satisfied: (|f/f4|+|f/f5|)/(|f/f1|+|f/f2|)&lt;1.0, the imaging lens system&#39;s control capability at the region close to the object-side end can be reinforced, and the lens element at the image-side end has an enhanced performance in correcting high order aberrations. Preferably, the following condition is satisfied: (|f/f4|+|f/f5|)/(|f/f1|+|f/f2|)&lt;0.60. 
     When an axial distance between the stop and the image-side surface of the fifth lens element is SD, an axial distance between the object-side surface of the first lens element and the image-side surface of the fifth lens element is TD, and the following condition is satisfied: 0.7&lt;SD/TD&lt;1.1, the total track length of the imaging lens system can be effectively reduced to prevent the imaging lens system from being too bulky while the incident angle of the light is controlled. 
     When a central thickness of the second lens element is CT2, the central thickness of the fourth lens element is CT4, and the following condition is satisfied: 1.0&lt;(CT2+CT4)/(CT2−CT4), the effective optical path length of the second lens element can be enhanced, and it is favorable for mitigating the distribution of the refractive power of the fourth lens element to correct the aberration at the periphery of the system, thereby obtaining a better image quality of a distant view image. Preferably, the following condition is satisfied: 2.0&lt;(CT2+CT4)/(CT2−CT4)&lt;50. 
     When the central thickness of the third lens element is CT3, the central thickness of the fourth lens element is CT4, and the following condition is satisfied: 0.3&lt;CT4/CT3&lt;2.5, the thicknesses of the lens elements can be effectively controlled to improve the manufacturability of the product and reduce the sensitivity. 
     When the focal length of the first lens element is f1, the focal length of the fourth lens element is f4, and the following condition is satisfied: −1.0&lt;f1/f4&lt;0, the distribution of the refractive power of the first lens element and the fourth lens element is more balanced and thereby to reduce the sensitivity and the aberration of the imaging lens system. Preferably, the following condition is satisfied: −0.5&lt;f1/f4&lt;0. 
     When an Abbe number of the first lens element is V1, an Abbe number of the second lens element is V2, an Abbe number of the fourth lens element is V4, and the following condition is satisfied: 0.5&lt;(V2+V4)/V1&lt;1.0, the chromatic aberration of the imaging lens system can be effectively corrected to improve the image quality. 
     When the focal length of the imaging lens system is f, a maximum image height of the imaging lens system is ImgH (i.e. half of a diagonal length of an effective photosensitive area of the image sensor), and the following condition is satisfied: 1.9&lt;f/ImgH&lt;5.0, it is favorable for keeping the imaging lens system compact and obtaining good image quality. 
     When a curvature radius of the object-side surface of the fourth lens element is R7, a curvature radius of the image-side surface of the fourth lens element is R8, and the following condition is satisfied: −35&lt;(R7+R8)/(R7−R8)&lt;−1.0, it is favorable for reducing the astigmatism so as to maintain good image quality. 
     When the maximum image height of the imaging lens system is ImgH, the axial distance between the second lens element and the third lens element is T23, the axial distance between the third lens element and the fourth lens element is T34, and the following condition is satisfied: 1.0&lt;ImgH/(T23+T34)&lt;2.2, the distances between the lens elements are more appropriate and favorable for keeping the imaging lens system compact. 
     When the focal length of the imaging lens system is f, the focal length of the first lens element is f1, the focal length of the second lens element is f2, and the following condition is satisfied: 2.5&lt;|f/f1|+|f/f2|, it is favorable for forming a telephoto structure so that certain area has a higher resolution. 
     When the focal length of the imaging lens system is f, a vertical distance between a critical point on the image-side surface of the fifth lens element and the optical axis is Yc52, and the following condition is satisfied: 3.0&lt;f/Yc52&lt;20, the aberration of the off-axis field can be favorably corrected to improve the image quality at the off-axis field. 
     When half of a maximal field of view of the imaging lens system is HFOV, and the following condition is satisfied: 10.0 [deg.]&lt;HFOV&lt;30.0 [deg.], an appropriate image capturing range is available for the imaging lens system under the telephoto structure. 
     When a maximum effective radius of the object-side surface of the first lens element is SD11, an entrance pupil diameter of the imaging lens system is EPD, and the following condition is satisfied: 0.95&lt;EPD/(SD11*2)&lt;1.1, it is favorable for forming a telephoto structure and providing a sufficient amount of incident light, thereby increasing the response speed of the image sensor. 
     When the maximum image height of the imaging lens system is ImgH, the entrance pupil diameter of the imaging lens system is EPD, and the following condition is satisfied: 0.85&lt;EPD/ImgH&lt;2.0, a sufficient amount of incident light can be provided, and it is favorable for keeping the imaging lens system compact so that it can be equipped in a compact portable electronic product. 
     According to the imaging lens system of the present disclosure, the lens elements thereof can be made of glass or plastic material. When the lens elements are made of glass material, the distribution of the refractive power of the imaging lens system may be more flexible to design. When the lens elements are made of plastic material, the manufacturing cost can be effectively reduced. Furthermore, surfaces of each lens element can be arranged to be aspheric (ASP). Since the aspheric surface of the lens element is easy to form a shape other than spherical surfaces so as to have more controllable variables for eliminating the aberration thereof and to further decrease the required number of the lens elements, the total track length of the imaging lens system can be effectively reduced. 
     The imaging lens system of the present disclosure can include at least one stop, such as an aperture stop, a glare stop or a field stop. 
     According to the imaging lens system of the present disclosure, a stop can be configured as a front stop or a middle stop. A front stop disposed between an imaged object and the first lens element can provide a longer distance between an exit pupil of the imaging lens system and the image surface, thereby the generated telecentric effect improves the image-sensing efficiency of an image sensor, such as a CCD or CMOS sensor. A middle stop disposed between the first lens element and the image surface is favorable for enlarging the field of view of the imaging lens system and thereby to provide a wider field of view for the same. 
     According to the imaging lens system of the present disclosure, when the lens element has a convex surface and the region of convex shape is not defined, it indicates that the surface is convex in the paraxial region thereof; when the lens element has a concave surface and the region of concave shape is not defined, it indicates that the surface is concave in the paraxial region thereof. Likewise, when the region of refractive power or focal length of a lens element is not defined, it indicates that the region of refractive power or focal length of the lens element is in the paraxial region thereof. 
     According to the imaging lens system of the present disclosure, an image surface of the imaging lens system, based on the corresponding image sensor, can be a plane or a curved surface with any curvature, especially a curved surface being concave facing towards the object side. 
     A critical point on a lens surface is a tangential point where the tangential plane, which is perpendicular to the optical axis, is tangent to the lens surface. It is to be noted that the critical point is an extremum point closest to (but not located at) the optical axis.  FIG. 12  is a schematic view showing a critical point  153  on an image-side surface  152  of a fifth lens element  150  of an imaging lens system shown in  FIG. 1A . A vertical distance between the critical point  153  on the image-side surface  152  of the fifth lens element  150  and an optical axis  101  is Yc52. 
     The imaging lens system of the present disclosure can be optionally applied to moving focus optical systems. According to the imaging lens system of the present disclosure, the imaging lens system features good aberration correction performance and high image quality, and can be applied to electronic devices, such as 3D (three-dimensional) image capturing applications digital cameras, mobile devices, digital tablets, smart TV, monitoring device over network, motion sensing input device, driving recording system, rear view camera system, and wearable devices. 
     According to the present disclosure, an image capturing device includes the aforementioned imaging lens system and an image sensor, wherein the image sensor is disposed on or near an image surface of the imaging lens system. Therefore, the design of the imaging lens system enables the image capturing device to achieve the best image quality. Preferably, the image capturing device can further include a barrel member, a holder member or a combination thereof. 
     Referring to  FIG. 11A ,  FIG. 11B  and  FIG. 11C , an image capturing device  1101  may be installed in a variety of electronic devices, including, but not limited to, a smart phone  1110 , a tablet personal computer  1120  and a wearable device  1130 . The three exemplary figures of different kinds of electronic devices are only exemplary for showing the image capturing device of present disclosure installed in an electronic device and are not limited thereto. Preferably, the electronic device can further include a control unit, a display unit, 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-10th specific embodiments are provided for further explanation. 
     1st Embodiment 
       FIG. 1A  is a schematic view of an image capturing device according to the 1st embodiment of the present disclosure.  FIG. 1B  shows, in order from left to right, longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing device according to the 1st embodiment. 
     In  FIG. 1A , the image capturing device includes an imaging lens system (not otherwise herein labeled) of the present disclosure and an image sensor  180 . The imaging lens system includes, in order from an object side to an image side, a first lens element  110 , a second lens element  120 , a third lens element  130 , a fourth lens element  140 , and a fifth lens element  150 , wherein the imaging lens system has a total of five lens elements ( 110 - 150 ) with refractive power. 
     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 convex in a paraxial region thereof, which are both aspheric, and the first lens element  110  is made of plastic material. 
     The second lens element  120  with negative refractive power has an object-side surface  121  being concave in a paraxial region thereof and an image-side surface  122  being concave in a paraxial region thereof, which are both aspheric, and the second lens element  120  is made of plastic material. 
     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 concave in a paraxial region thereof, which are both aspheric, and the third lens element  130  is made of plastic material. Furthermore, each of the object-side surface  131  and the image-side surface  132  of the third lens element  130  has at least one inflection point. 
     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, which are both aspheric, and the fourth lens element  140  is made of plastic material. 
     The fifth lens element  150  with negative refractive power has an object-side surface  151  being convex in a paraxial region thereof and an image-side surface  152  being concave in a paraxial region thereof, which are both aspheric, and the fifth lens element  150  is made of plastic material. Furthermore, each of the object-side surface  151  and the image-side surface  152  of the fifth lens element  150  has at least one inflection point. 
     The imaging lens system is further provided with a stop  100  disposed between an imaged object and the first lens element  110 , and no lens element with refractive power is disposed between the stop  100  and the first lens element  110 . The imaging lens system further includes an IR-cut filter  160  placed between the fifth lens element  150  and an image surface  170 . The IR-cut filter  160  is made of glass and will not affect the focal length of the imaging lens system. The image sensor  180  is disposed on or near the image surface  170  of the imaging lens system. 
     The equation of the aspheric surface profiles is expressed as follows: 
     
       
         
           
             
               
                 X 
                 ⁡ 
                 
                   ( 
                   Y 
                   ) 
                 
               
               = 
               
                 
                   
                     ( 
                     
                       
                         Y 
                         2 
                       
                       / 
                       R 
                     
                     ) 
                   
                   / 
                   
                     ( 
                     
                       1 
                       + 
                       
                         sqrt 
                         ⁡ 
                         
                           ( 
                           
                             1 
                             - 
                             
                               
                                 ( 
                                 
                                   1 
                                   + 
                                   k 
                                 
                                 ) 
                               
                               * 
                               
                                 
                                   ( 
                                   
                                     Y 
                                     / 
                                     R 
                                   
                                   ) 
                                 
                                 2 
                               
                             
                           
                           ) 
                         
                       
                     
                     ) 
                   
                 
                 + 
                 
                   
                     ∑ 
                     i 
                   
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                       ( 
                       Ai 
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             , 
             
               
 
             
             ⁢ 
             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 first embodiment, a focal length of the imaging lens system is f, an f-number of the imaging lens system is Fno, half of a maximal field of view of the imaging lens system is HFOV, and these parameters have the following values: f=5.27 mm; Fno=2.40; HFOV=22.7 degrees. 
     In the first embodiment, an Abbe number of the first lens element  110  is V1, an Abbe number of the second lens element  120  is V2, an Abbe number of the fourth lens element  140  is V4, and they satisfy the condition: (V2+V4)/V1=0.84. 
     In the first embodiment, 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, a central thickness of the third lens element  130  is CT3, a central thickness of the fourth lens element  140  is CT4, a central thickness of the fifth lens element  150  is CT5, and they satisfy the condition: (T23+T34)/(CT3+CT4+CT5)=1.32. 
     In the first embodiment, a central thickness of the second lens element  120  is CT2, the central thickness of the fourth lens element  140  is CT4, and they satisfy the condition: (CT2+CT4)/(CT2−CT4)=3.17. 
     In the first embodiment, the central thickness of the fourth lens element  140  is CT4, the central thickness of the third lens element  130  is CT3, and they satisfy the condition: CT4/CT3=1.06. 
     In the first embodiment, a curvature radius of the object-side surface of the fourth lens element  140  is R7, a curvature radius of the image-side surface of the fourth lens element  140  is R8, and they satisfy the condition: (R7+R8)/(R7−R8)=−7.26. 
     In the first embodiment, the focal length of the imaging lens 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, and they satisfy the condition: |f/f1|+|f/f2|=4.40. 
     In the first embodiment, the focal length of the first lens element  110  is f1, a focal length of the fourth lens element  140  is f4, and they satisfy the condition: f1/f4=−0.12. 
     In the first embodiment, the focal length of the imaging lens system is f, the focal length of the first lens element  110  is f1, the focal length of the second lens element  120  is f2, the focal length of the fourth lens element  140  is f4, a focal length of the fifth lens element  150  is f5, and they satisfy the condition: (|f/f4|+|f/f5|)/(|f/f1|+|f/f2|)=0.13. 
     In the first embodiment, the axial distance between the second lens element  120  and the third lens element  130  is T23, the axial distance between the third lens element  130  and the fourth lens element  140  is T34, a maximum image height of the imaging lens system is ImgH (i.e. half of a diagonal length of an effective photosensitive area of the image sensor), and they satisfy the condition: ImgH/(T23+T34)=1.81. 
     In the first embodiment, the focal length of the imaging lens system is f, the maximum image height of the imaging lens system is ImgH, and they satisfy the condition: f/ImgH=2.29. 
     In the first embodiment, an entrance pupil diameter of the imaging lens system is EPD, the maximum image height of the imaging lens system is ImgH, and they satisfy the condition: EPD/ImgH=0.95. 
     In the first embodiment, an axial distance between the stop  100  and the image-side surface of the fifth lens element  150  is SD, an axial distance between the object-side surface of the first lens element  110  and the image-side surface of the fifth lens element  150  is TD, and they satisfy the condition: SD/TD=0.90. 
     In the first embodiment, the focal length of the imaging lens system is f, a vertical distance between a critical point on the image-side surface of the fifth lens element  150  and the optical axis is Yc52, and they satisfy the condition: f/Yc52=6.71. 
     In the first embodiment, the entrance pupil diameter of the imaging lens system is EPD, a maximum effective radius of the object-side surface  111  of the first lens element  110  is SD11, and they satisfy the condition: EPD/(SD11*2)=0.99. 
     The detailed optical data of the first embodiment are shown in TABLE 1, and the aspheric surface data are shown in TABLE 2, wherein the units of the curvature radius, the thickness and the focal length are expressed in mm, and HFOV is half of the maximal field of view. 
     
       
         
           
               
             
               
                 TABLE 1 
               
             
            
               
                   
               
               
                 (Embodiment 1) 
               
               
                 f = 5.27 mm, Fno = 2.40, HFOV = 22.7 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                   
                   
                   
                   
                   
                   
                 Focal 
               
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Length 
               
               
                   
               
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 Stop 
                 Plano 
                 −0.360  
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 2 
                 Lens 1 
                 1.611 
                 ASP 
                 0.787  
                 Plastic 
                 1.544 
                 55.9 
                  2.21 
               
               
                 3 
                   
                 −3.934  
                 ASP 
                 0.036 
                   
                   
                   
                   
               
               
                 4 
                 Lens 2 
                 −11.749  
                 ASP 
                 0.550 
                 Plastic 
                 1.639 
                 23.5 
                 −2.61 
               
               
                 5 
                   
                 1.978 
                 ASP 
                 0.450 
                   
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 5.630 
                 ASP 
                 0.270 
                 Plastic 
                 1.544 
                 55.9 
                 23.22 
               
               
                 7 
                   
                 9.982 
                 ASP 
                 0.824 
                   
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 −2.474  
                 ASP 
                 0.286 
                 Plastic 
                 1.639 
                 23.5 
                 −18.61  
               
               
                 9 
                   
                 −3.266  
                 ASP 
                 0.108 
                   
                   
                   
                   
               
               
                 10  
                 Lens 5 
                 2.061 
                 ASP 
                 0.410 
                 Plastic 
                 1.544 
                 55.9 
                 −18.23  
               
               
                 11  
                   
                 1.587 
                 ASP 
                 0.700 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 12  
                 IR-cut filter 
                 Plano 
                 0.300 
                 Glass 
                 1.517 
                 64.2 
                   
               
               
                 13  
                   
                 Plano 
                 0.476 
                   
                   
                   
                   
               
               
                 14  
                 Image Surface 
                 Plano 
                 — 
               
               
                   
               
               
                 Note: 
               
               
                 Reference Wavelength is d-line 587.6 nm 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 2 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
            
               
                   
                 Surface # 
               
            
           
           
               
               
               
               
               
               
            
               
                   
                 2 
                 3 
                 4 
                 5 
                 6 
               
               
                   
               
               
                 k = 
                 −1.0636E−01 
                 −2.0368E+01 
                 −9.0000E+01 
                 −8.7888E+00 
                 −9.0000E+01 
               
               
                 A4 = 
                 −8.2211E−03 
                 −5.3840E−02 
                 −1.1365E−01 
                 −6.4197E−02 
                 −2.8280E−01 
               
               
                 A6 = 
                  2.9345E−02 
                  1.4397E−01 
                  2.0677E−01 
                  2.0498E−01 
                  5.7291E−01 
               
               
                 A8 = 
                 −4.5207E−02 
                 −8.6767E−02 
                  3.3919E−02 
                 −2.5349E−01 
                 −1.7844E+00 
               
               
                 A10 = 
                 −3.5354E−02 
                 −2.1093E−02 
                 −2.5367E−01 
                  5.8293E−01 
                  4.8988E+00 
               
               
                 A12 = 
                  8.6537E−02 
                  4.1858E−02 
                  1.9572E−01 
                 −6.3840E−01 
                 −6.5905E+00 
               
               
                 A14 = 
                 −4.1233E−02 
                 −1.9393E−02 
                 −5.3417E−02 
                  2.5250E−01 
                  4.2515E+00 
               
               
                 A16 = 
                   
                   
                   
                   
                 −1.0803E+00 
               
               
                   
               
            
           
           
               
               
            
               
                   
                 Surface # 
               
            
           
           
               
               
               
               
               
               
            
               
                   
                 7 
                 8 
                 9 
                 10 
                 11 
               
               
                   
               
               
                 k = 
                  2.0000E+01 
                 −5.8523E+01 
                  1.6502E−02 
                 −1.5701E+01 
                 −5.8505E+00 
               
               
                 A4 = 
                 −1.6857E−01 
                 −1.1095E−01 
                  3.1501E−02 
                 −3.3843E−01 
                 −2.7939E−01 
               
               
                 A6 = 
                  2.1729E−01 
                  1.4323E−01 
                 −1.5481E−01 
                  9.6254E−02 
                  1.5941E−01 
               
               
                 A8 = 
                 −1.4077E−01 
                 −7.2109E−02 
                  2.8497E−01 
                  4.0344E−02 
                 −6.5206E−02 
               
               
                 A10 = 
                  6.0583E−01 
                  3.5677E−02 
                 −2.0155E−01 
                 −2.4756E−02 
                  1.9056E−02 
               
               
                 A12 = 
                 −6.2811E−01 
                 −2.5259E−02 
                  6.9548E−02 
                  4.6145E−03 
                 −4.4807E−03 
               
               
                 A14 = 
                  1.7957E−01 
                  1.0199E−02 
                 −1.1628E−02 
                 −3.7203E−04 
                  8.3789E−04 
               
               
                 A16 = 
                   
                 −1.4712E−03 
                  7.3542E−04 
                  1.1138E−05 
                 −7.6310E−05 
               
               
                   
               
            
           
         
       
     
     2nd Embodiment 
       FIG. 2A  is a schematic view of an image capturing device according to the 2nd embodiment of the present disclosure.  FIG. 2B  shows, in order from left to right, longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing device according to the 2nd embodiment. 
     In  FIG. 2A , the image capturing device includes an imaging lens system (not otherwise herein labeled) of the present disclosure and an image sensor  280 . The imaging lens system includes, in order from an object side to an image side, a first lens element  210 , a second lens element  220 , a third lens element  230 , a fourth lens element  240 , and a fifth lens element  250 , wherein the imaging lens system has a total of five lens elements ( 210 - 250 ) with refractive power. 
     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 concave in a paraxial region thereof, which are both aspheric, and the first lens element  210  is made of plastic material. 
     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, which are both aspheric, and the second lens element  220  is made of plastic material. 
     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 concave in a paraxial region thereof, which are both aspheric, and the third lens element  230  is made of plastic material. Furthermore, each of the object-side surface  231  and the image-side surface  232  of the third lens element  230  has at least one inflection point. 
     The fourth lens element  240  with negative 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, which are both aspheric, and the fourth lens element  240  is made of plastic material. 
     The fifth lens element  250  with negative refractive power has an object-side surface  251  being convex in a paraxial region thereof and an image-side surface  252  being concave in a paraxial region thereof, which are both aspheric, and the fifth lens element  250  is made of plastic material. Furthermore, each of the object-side surface  251  and the image-side surface  252  of the fifth lens element  250  has at least one inflection point. 
     The imaging lens system is further provided with a stop  200  disposed between an imaged object and the first lens element  210 , and no lens element with refractive power is disposed between the stop  200  and the first lens element  210 . The imaging lens system further includes an IR-cut filter  260  placed between the fifth lens element  250  and an image surface  270 . The IR-cut filter  260  is made of glass and will not affect the focal length of the imaging lens system. The image sensor  280  is disposed on or near the image surface  270  of the imaging lens system. 
     The detailed optical data of the second embodiment are shown in TABLE 3, and the aspheric surface data are shown in TABLE 4, wherein the units of the curvature radius, the thickness and the focal length are expressed in mm, and HFOV is half of the maximal field of view. 
     
       
         
           
               
             
               
                 TABLE 3 
               
             
            
               
                   
               
               
                 (Embodiment 2) 
               
               
                 f = 5.31 mm, Fno = 2.50, HFOV = 22.3 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                   
                   
                   
                   
                   
                   
                 Focal 
               
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Length 
               
               
                   
               
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 Stop 
                 Plano 
                 −0.360  
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 2 
                 Lens 1 
                 1.504 
                 ASP 
                 0.663 
                 Plastic 
                 1.544 
                 55.9 
                  3.11 
               
               
                 3 
                   
                 11.436  
                 ASP 
                 0.040 
                   
                   
                   
                   
               
               
                 4 
                 Lens 2 
                 4.998 
                 ASP 
                 0.400 
                 Plastic 
                 1.640 
                 23.3 
                 −4.60 
               
               
                 5 
                   
                 1.794 
                 ASP 
                 0.325 
                   
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 3.982 
                 ASP 
                 0.285 
                 Plastic 
                 1.544 
                 55.9 
                 14.84 
               
               
                 7 
                   
                 7.661 
                 ASP 
                 0.928 
                   
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 −2.642  
                 ASP 
                 0.306 
                 Plastic 
                 1.640 
                 23.3 
                 −151.40  
               
               
                 9 
                   
                 −2.839  
                 ASP 
                 0.194 
                   
                   
                   
                   
               
               
                 10  
                 Lens 5 
                 2.212 
                 ASP 
                 0.281 
                 Plastic 
                 1.640 
                 23.3 
                 −12.17  
               
               
                 11  
                   
                 1.637 
                 ASP 
                 0.700 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 12  
                 IR-cut filter 
                 Plano 
                 0.300 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 13  
                   
                 Plano 
                 0.879 
                   
                   
                   
                   
               
               
                 14  
                 Image Surface 
                 Plano 
                 — 
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is d-line 587.6 nm 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 4 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
            
               
                   
                 Surface # 
               
            
           
           
               
               
               
               
               
               
            
               
                   
                 2 
                 3 
                 4 
                 5 
                 6 
               
               
                   
               
               
                 k = 
                 −8.7952E−02 
                 −9.0000E+01 
                 −6.1786E+01 
                 −8.3476E+00 
                 −5.1785E+01 
               
               
                 A4 = 
                 −3.5796E−03 
                 −5.8184E−02 
                 −1.1111E−01 
                 −7.8177E−02 
                 −2.8541E−01 
               
               
                 A6 = 
                  3.3779E−02 
                  1.4351E−01 
                  2.0541E−01 
                  2.1726E−01 
                  5.8023E−01 
               
               
                 A8 = 
                 −4.6115E−02 
                 −8.6916E−02 
                  3.3553E−02 
                 −2.4354E−01 
                 −1.7820E+00 
               
               
                 A10 = 
                 −3.6305E−02 
                 −2.1469E−02 
                 −2.5285E−01 
                  5.8371E−01 
                  4.9010E+00 
               
               
                 A12 = 
                  8.6358E−02 
                  4.1507E−02 
                  1.9676E−01 
                 −6.4121E−01 
                 −6.5897E+00 
               
               
                 A14 = 
                 −4.0893E−02 
                 −1.9618E−02 
                 −5.2619E−02 
                  2.4943E−01 
                  4.2504E+00 
               
               
                 A16 = 
                   
                   
                   
                   
                 −1.0830E+00 
               
               
                   
               
            
           
           
               
               
            
               
                   
                 Surface # 
               
            
           
           
               
               
               
               
               
               
            
               
                   
                 7 
                 8 
                 9 
                 10 
                 11 
               
               
                   
               
               
                 k = 
                 −1.3288E+01 
                 −5.0821E+01 
                  4.5189E−01 
                 −4.6915E+01 
                 −1.8811E+01 
               
               
                 A4 = 
                 −1.6287E−01 
                 −1.5250E−01 
                  2.8305E−02 
                 −3.4961E−01 
                 −2.8562E−01 
               
               
                 A6 = 
                  2.2402E−01 
                  1.4511E−01 
                 −1.5401E−01 
                  9.6316E−02 
                  1.5556E−01 
               
               
                 A8 = 
                 −1.2876E−01 
                 −6.9160E−02 
                  2.8518E−01 
                  4.0510E−02 
                 −6.4374E−02 
               
               
                 A10 = 
                  6.1274E−01 
                  3.6751E−02 
                 −2.0157E−01 
                 −2.4634E−02 
                  1.9424E−02 
               
               
                 A12 = 
                 −6.2490E−01 
                 −2.5089E−02 
                  6.9513E−02 
                  4.6643E−03 
                 −4.4068E−03 
               
               
                 A14 = 
                  1.8064E−01 
                  1.0057E−02 
                 −1.1654E−02 
                 −3.5050E−04 
                  8.4527E−04 
               
               
                 A16 = 
                   
                 −1.6723E−03 
                  7.1842E−04 
                  1.1138E−05 
                 −7.7575E−05 
               
               
                   
               
            
           
         
       
     
     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 Table 5 below 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 and satisfy the conditions stated in Table 5. 
     
       
         
           
               
             
               
                 TABLE 5 
               
               
                   
               
               
                 2 nd  Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 5.31 
                 f1/f4 
                 −0.02 
               
               
                 Fno 
                 2.50 
                 (|f/f4| + |f/f5|)/(|f/f1| + |f/f2|) 
                 0.16 
               
               
                 HFOV [deg.] 
                 22.3 
                 ImgH/(T23 + T34) 
                 1.84 
               
               
                 (V2 + V4)/V1 
                 0.83 
                 f/ImgH 
                 2.31 
               
               
                 (T23 + T34)/ 
                 1.44 
                 EPD/ImgH 
                 0.92 
               
               
                 (CT3 + CT4 + CT5) 
                   
                 SD/TD 
                 0.89 
               
               
                 (CT2 + CT4)/(CT2 − CT4) 
                 7.51 
                 f/Yc52 
                 8.63 
               
               
                 CT4/CT3 
                 1.07 
                 EPD/(SD11*2) 
                 0.97 
               
               
                 (R7 + R8)/(R7 − R8) 
                 −27.85 
                   
                   
               
               
                 |f/f1| + |f/f2| 
                 2.86 
               
               
                   
               
            
           
         
       
     
     3rd Embodiment 
       FIG. 3A  is a schematic view of an image capturing device according to the 3rd embodiment of the present disclosure.  FIG. 3B  shows, in order from left to right, longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing device according to the 3rd embodiment. 
     In  FIG. 3A , the image capturing device includes an imaging lens system (not otherwise herein labeled) of the present disclosure and an image sensor  380 . The imaging lens system includes, in order from an object side to an image side, a first lens element  310 , a second lens element  320 , a third lens element  330 , a fourth lens element  340 , and a fifth lens element  350 , wherein the imaging lens system has a total of five lens elements ( 310 - 350 ) with refractive power. 
     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, which are both aspheric, and the first lens element  310  is made of plastic material. 
     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, which are both aspheric, and the second lens element  320  is made of plastic material. 
     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, which are both aspheric, and the third lens element  330  is made of plastic material. Furthermore, the object-side surface  331  of the third lens element  330  has at least one inflection point. 
     The fourth lens element  340  with negative refractive power has an object-side surface  341  being concave in a paraxial region thereof and an image-side surface  342  being convex in a paraxial region thereof, which are both aspheric, and the fourth lens element  340  is made of plastic material. 
     The fifth lens element  350  with negative refractive power has an object-side surface  351  being convex in a paraxial region thereof and an image-side surface  352  being concave in a paraxial region thereof, which are both aspheric, and the fifth lens element  350  is made of plastic material. Furthermore, each of the object-side surface  351  and the image-side surface  352  of the fifth lens element  350  has at least one inflection point. 
     The imaging lens system is further provided with a stop  300  disposed between an imaged object and the first lens element  310 , and no lens element with refractive power is disposed between the stop  300  and the first lens element  310 . The imaging lens system further includes an IR-cut filter  360  placed between the fifth lens element  350  and an image surface  370 . The IR-cut filter  360  is made of glass and will not affect the focal length of the imaging lens system. The image sensor  380  is disposed on or near the image surface  370  of the imaging lens system. 
     The detailed optical data of the third embodiment are shown in TABLE 6, and the aspheric surface data are shown in TABLE 7, wherein the units of the curvature radius, the thickness and the focal length are expressed in mm, and HFOV is half of the maximal field of view. 
     
       
         
           
               
             
               
                 TABLE 6 
               
             
            
               
                   
               
               
                 (Embodiment 3) 
               
               
                 f = 5.22 mm, Fno = 2.40, HFOV = 20.8 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                   
                   
                   
                   
                   
                   
                 Focal 
               
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Length 
               
               
                   
               
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 Stop 
                 Plano 
                 −0.360  
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 2 
                 Lens 1 
                 1.520 
                 ASP 
                 0.680 
                 Plastic 
                 1.544 
                 55.9 
                  3.34 
               
               
                 3 
                   
                 7.859 
                 ASP 
                 0.060 
                   
                   
                   
                   
               
               
                 4 
                 Lens 2 
                 3.032 
                 ASP 
                 0.321 
                 Plastic 
                 1.650 
                 21.4 
                 −5.43 
               
               
                 5 
                   
                 1.563 
                 ASP 
                 0.369 
                   
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 3.623 
                 ASP 
                 0.297 
                 Plastic 
                 1.544 
                 55.9 
                 12.17 
               
               
                 7 
                   
                 7.766 
                 ASP 
                 1.205 
                   
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 −4.351  
                 ASP 
                 0.270 
                 Plastic 
                 1.544 
                 55.9 
                 −31.45  
               
               
                 9 
                   
                 −5.962  
                 ASP 
                 0.315 
                   
                   
                   
                   
               
               
                 10  
                 Lens 5 
                 2.975 
                 ASP 
                 0.261 
                 Plastic 
                 1.544 
                 55.9 
                 −6.59 
               
               
                 11  
                   
                 1.575 
                 ASP 
                 0.700 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 12  
                 IR-cut filter 
                 Plano 
                 0.300 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 13  
                   
                 Plano 
                 0.591 
                   
                   
                   
                   
               
               
                 14  
                 Image Surface 
                 Plano 
                 — 
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is d-line 587.6 nm 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 7 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
            
               
                   
                 Surface # 
               
            
           
           
               
               
               
               
               
               
            
               
                   
                 2 
                 3 
                 4 
                 5 
                 6 
               
               
                   
               
               
                 k = 
                 −7.0358E−02 
                 −9.0000E+01 
                 −9.0000E+01 
                 −1.2783E+01 
                 −7.9246E+01 
               
               
                 A4 = 
                 −1.8442E−03 
                 −5.9923E−02 
                 −1.1242E−01 
                 −8.5300E−02 
                 −2.3414E−01 
               
               
                 A6 = 
                  3.5121E−02 
                  1.4357E−01 
                  2.0490E−01 
                  2.3676E−01 
                  5.8001E−01 
               
               
                 A8 = 
                 −4.6779E−02 
                 −8.6956E−02 
                  3.4241E−02 
                 −2.3792E−01 
                 −1.7756E+00 
               
               
                 A10 = 
                 −3.6365E−02 
                 −2.1416E−02 
                 −2.5211E−01 
                  5.8160E−01 
                  4.9068E+00 
               
               
                 A12 = 
                  8.6856E−02 
                  4.1759E−02 
                  1.9701E−01 
                 −6.4324E−01 
                 −6.5886E+00 
               
               
                 A14 = 
                 −4.0210E−02 
                 −1.9235E−02 
                 −5.2795E−02 
                  2.5063E−01 
                  4.2473E+00 
               
               
                 A16 = 
                   
                   
                   
                   
                 −1.0888E+00 
               
               
                   
               
            
           
           
               
               
            
               
                   
                 Surface # 
               
            
           
           
               
               
               
               
               
               
            
               
                   
                 7 
                 8 
                 9 
                 10 
                 11 
               
               
                   
               
               
                 k = 
                  2.0000E+01 
                 −9.0000E+01 
                  4.0663E+00 
                 −5.8140E+01 
                 −1.7800E+01 
               
               
                 A4 = 
                 −1.5304E−01 
                 −1.8581E−01 
                 −1.5258E−02 
                 −3.4872E−01 
                 −2.9295E−01 
               
               
                 A6 = 
                  2.5628E−01 
                  1.5368E−01 
                 −1.5172E−01 
                  9.6873E−02 
                  1.5700E−01 
               
               
                 A8 = 
                 −1.2098E−01 
                 −6.8329E−02 
                  2.8669E−01 
                  4.0671E−02 
                 −6.3746E−02 
               
               
                 A10 = 
                  6.0780E−01 
                  3.6729E−02 
                 −2.0132E−01 
                 −2.4583E−02 
                  1.9533E−02 
               
               
                 A12 = 
                 −6.3322E−01 
                 −2.5129E−02 
                  6.9497E−02 
                  4.6706E−03 
                 −4.3963E−03 
               
               
                 A14 = 
                  1.7225E−01 
                  1.0033E−02 
                 −1.1683E−02 
                 −3.5771E−04 
                  8.4607E−04 
               
               
                 A16 = 
                   
                 −1.6927E−03 
                  7.0435E−04 
                  1.1138E−05 
                 −7.7249E−05 
               
               
                   
               
            
           
         
       
     
     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 Table 8 below 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 6 and Table 7 and satisfy the conditions stated in Table 8. 
     
       
         
           
               
             
               
                 TABLE 8 
               
               
                   
               
               
                 3 rd  Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 5.22 
                 f1/f4 
                 −0.11 
               
               
                 Fno 
                 2.40 
                 (|f/f4| + |f/f5|)/ 
                 0.38 
               
               
                 HFOV [deg.] 
                 20.8 
                 (|f/f1| + |f/f2|) 
                   
               
               
                 (V2 + V4)/V1 
                 1.38 
                 ImgH/(T23 + T34) 
                 1.46 
               
               
                 (T23 + T34)/(CT3 + CT4 + CT5) 
                 1.90 
                 f/ImgH 
                 2.27 
               
               
                 (CT2 + CT4)/(CT2 − CT4) 
                 11.59 
                 EPD/ImgH 
                 0.95 
               
               
                 CT4/CT3 
                 0.91 
                 SD/TD 
                 0.90 
               
               
                 (R7 + R8)/(R7 − R8) 
                 −6.40 
                 f/Yc52 
                 8.50 
               
               
                 |f/f1| + |f/f2| 
                 2.53 
                 EPD/(SD11 * 2) 
                 0.96 
               
               
                   
               
            
           
         
       
     
     4th Embodiment 
       FIG. 4A  is a schematic view of an image capturing device according to the 4th embodiment of the present disclosure.  FIG. 4B  shows, in order from left to right, longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing device according to the 4th embodiment. 
     In  FIG. 4A , the image capturing device includes an imaging lens system (not otherwise herein labeled) of the present disclosure and an image sensor  480 . The imaging lens system includes, in order from an object side to an image side, a first lens element  410 , a second lens element  420 , a third lens element  430 , a fourth lens element  440 , and a fifth lens element  450 , wherein the imaging lens system has a total of five lens elements ( 410 - 450 ) with refractive power. 
     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, which are both aspheric, and the first lens element  410  is made of plastic material. 
     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, which are both aspheric, and the second lens element  420  is made of plastic material. 
     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 concave in a paraxial region thereof, which are both aspheric, and the third lens element  430  is made of plastic material. Furthermore, the object-side surface  431  of the third lens element  430  has at least one inflection point. 
     The fourth lens element  440  with negative 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, which are both aspheric, and the fourth lens element  440  is made of plastic material. 
     The fifth lens element  450  with positive refractive power has an object-side surface  451  being convex in a paraxial region thereof and an image-side surface  452  being concave in a paraxial region thereof, which are both aspheric, and the fifth lens element  450  is made of plastic material. Furthermore, each of the object-side surface  451  and the image-side surface  452  of the fifth lens element  450  has at least one inflection point. 
     The imaging lens system is further provided with a stop  400  disposed between an imaged object and the first lens element  410 , and no lens element with refractive power is disposed between the stop  400  and the first lens element  410 . The imaging lens system further includes an IR-cut filter  460  placed between the fifth lens element  450  and an image surface  470 . The IR-cut filter  460  is made of glass and will not affect the focal length of the imaging lens system. The image sensor  480  is disposed on or near the image surface  470  of the imaging lens system. 
     The detailed optical data of the fourth embodiment are shown in TABLE 9, and the aspheric surface data are shown in TABLE 10, wherein the units of the curvature radius, the thickness and the focal length are expressed in mm, and HFOV is half of the maximal field of view. 
     
       
         
           
               
             
               
                 TABLE 9 
               
             
            
               
                   
               
               
                 (Embodiment 4) 
               
               
                 f = 5.20 mm, Fno = 2.40, HFOV = 20.8 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                   
                   
                   
                   
                   
                   
                 Focal  
               
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Length 
               
               
                   
               
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 Stop 
                 Plano 
                 −0.360  
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 2 
                 Lens 1 
                 1.492 
                 ASP 
                 0.654 
                 Plastic 
                 1.544 
                 55.9 
                  3.74 
               
               
                 3 
                   
                 4.712 
                 ASP 
                 0.079 
                   
                   
                   
                   
               
               
                 4 
                 Lens 2 
                 2.387 
                 ASP 
                 0.312 
                 Plastic 
                 1.650 
                 21.4 
                 −5.14 
               
               
                 5 
                   
                 1.320  
                 ASP 
                 0.227 
                   
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 3.179  
                 ASP 
                 0.285  
                 Plastic 
                 1.544 
                 55.9 
                  7.61 
               
               
                 7 
                   
                 13.282  
                 ASP 
                 1.401 
                   
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 −2.056  
                 ASP 
                 0.297  
                 Plastic 
                 1.650 
                 21.4 
                 −5.70 
               
               
                 9 
                   
                 −4.887  
                 ASP 
                 0.050 
                   
                   
                   
                   
               
               
                 10  
                 Lens 5 
                 1.144  
                 ASP 
                 0.284 
                 Plastic 
                 1.544 
                 55.9 
                 16.22 
               
               
                 11  
                   
                 1.200  
                 ASP 
                 0.700 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 12  
                 IR-cut filter 
                 Plano 
                 0.300  
                 Glass 
                 1.517 
                 64.2 
                   
               
               
                 13  
                   
                 Plano 
                 0.906 
                   
                   
                   
                   
               
               
                 14  
                 Image Surface 
                 Plano 
                 — 
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is d-line 587.6 nm 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 10 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
            
               
                 Surface # 
                 2 
                 3 
                 4 
                 5 
                 6 
               
               
                   
               
               
                 k = 
                 −8.3911E−02 
                 −8.7787E+01 
                 −8.3262E+01 
                 −1.3827E+01 
                 −6.5265E+01 
               
               
                 A4 = 
                 −6.1789E−03 
                 −5.9424E−02  
                 −1.1527E−01 
                 −9.4107E−02  
                 −2.2298E−01 
               
               
                 A6 = 
                   3.6432E−02 
                   1.4478E−01 
                   2.0475E−01 
                   2.4428E−01 
                   6.2532E−01 
               
               
                 A8 = 
                 −4.7938E−02 
                 −8.6875E−02  
                   3.6476E−02 
                 −2.3364E−01  
                 −1.7790E+00 
               
               
                 A10 = 
                 −3.7276E−02 
                 −2.1384E−02 
                 −2.5037E−01 
                   5.8532E−01 
                   4.8948E+00 
               
               
                 A12 = 
                   8.6554E−02 
                   4.1936E−02 
                   1.9799E−01 
                 −6.4047E−01  
                 −6.5954E+00 
               
               
                 A14 = 
                 −4.0111E−02 
                 −1.8959E−02  
                 −5.2343E−02 
                   2.5172E−01 
                   4.2473E+00 
               
               
                 A16 = 
                   
                   
                   
                   
                 −1.0837E+00 
               
               
                   
               
               
                 Surface # 
                 7 
                 8 
                 9 
                 10 
                 11 
               
               
                   
               
               
                 k = 
                   1.5252E+01 
                 −9.0000E+01 
                   5.2074E+00 
                 −1.4207E+01 
                 −9.3213E+00 
               
               
                 A4 = 
                 −4.2058E−02 
                 −1.4185E−01 
                 −3.1417E−02 
                 −3.6006E−01 
                 −2.6217E−01 
               
               
                 A6 = 
                   2.3473E−01 
                   1.4770E−01 
                 −1.4835E−01 
                   1.0035E−01 
                   1.5495E−01 
               
               
                 A8 = 
                 −1.2220E−01 
                 −7.1222E−02 
                   2.8899E−01 
                   4.1388E−02 
                 −6.3224E−02 
               
               
                 A10 = 
                   6.0987E−01 
                   3.6518E−02 
                 −2.0081E−01 
                 −2.4515E−02 
                   1.9655E−02 
               
               
                 A12 = 
                 −6.3790E−01 
                 −2.4836E−02 
                   6.9587E−02 
                   4.6319E−03 
                 −4.4262E−03 
               
               
                 A14 = 
                   1.5873E−01 
                   1.0243E−02 
                 −1.1663E−02 
                 −3.9559E−04 
                   8.1555E−04 
               
               
                 A16 = 
                   
                 −1.5936E−03 
                   7.1571E−04 
                   1.1138E−05 
                 −9.1603E−05 
               
               
                   
               
            
           
         
       
     
     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 Table 11 below 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 9 and Table 10 and satisfy the conditions stated in Table 11. 
     
       
         
           
               
             
               
                 TABLE 11 
               
               
                   
               
               
                 4 th  Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 5.20 
                 f1/f4 
                 −0.66 
               
               
                 Fno 
                 2.40 
                 (|f/f4| + |f/f5|)/ 
                 0.51 
               
               
                 HFOV [deg.] 
                 20.8 
                 (|f/f1| + |f/f2|) 
                   
               
               
                 (V2 + V4)/V1 
                 0.77 
                 ImgH/(T23 + T34) 
                 1.41 
               
               
                 (T23 + T34)/(CT3 + CT4 + CT5) 
                 1.88 
                 f/ImgH 
                 2.26 
               
               
                 (CT2 + CT4)/(CT2 − CT4) 
                 40.60 
                 EPD/ImgH 
                 0.94 
               
               
                 CT4/CT3 
                 1.04 
                 SD/TD 
                 0.90 
               
               
                 (R7 + R8)/(R7 − R8) 
                 −2.45 
                 f/Yc52 
                 6.63 
               
               
                 |f/f1| + |f/f2| 
                 2.40 
                 EPD/(SD11 * 2) 
                 0.96 
               
               
                   
               
            
           
         
       
     
     5th Embodiment 
       FIG. 5A  is a schematic view of an image capturing device according to the 5th embodiment of the present disclosure.  FIG. 5B  shows, in order from left to right, longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing device according to the 5th embodiment. 
     In  FIG. 5A , the image capturing device includes an imaging lens system (not otherwise herein labeled) of the present disclosure and an image sensor  580 . The imaging lens system includes, in order from an object side to an image side, a first lens element  510 , a second lens element  520 , a third lens element  530 , a fourth lens element  540 , and a fifth lens element  550 , wherein the imaging lens system has a total of five lens elements ( 510 - 550 ) with refractive power. 
     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 convex in a paraxial region thereof, which are both aspheric, and the first lens element  510  is made of plastic material. 
     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, which are both aspheric, and the second lens element  520  is made of plastic material. 
     The third lens element  530  with negative 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, which are both aspheric, and the third lens element  530  is made of plastic material. Furthermore, each of the object-side surface  531  and the image-side surface  532  of the third lens element  530  has at least one inflection point. 
     The fourth lens element  540  with negative refractive power has an object-side surface  541  being concave in a paraxial region thereof and an image-side surface  542  being convex in a paraxial region thereof, which are both aspheric, and the fourth lens element  540  is made of plastic material. 
     The fifth lens element  550  with positive refractive power has an object-side surface  551  being convex in a paraxial region thereof and an image-side surface  552  being concave in a paraxial region thereof, which are both aspheric, and the fifth lens element  550  is made of plastic material. Furthermore, each of the object-side surface  551  and the image-side surface  552  of the fifth lens element  550  has at least one inflection point. 
     The imaging lens system is further provided with a stop  500  disposed between the first lens element  510  and the second lens element  520 , and no lens element with refractive power is disposed between the stop  500  and the first lens element  510 . The imaging lens system further includes an IR-cut filter  560  placed between the fifth lens element  550  and an image surface  570 . The IR-cut filter  560  is made of glass and will not affect the focal length of the imaging lens system. The image sensor  580  is disposed on or near the image surface  570  of the imaging lens system. 
     The detailed optical data of the fifth embodiment are shown in TABLE 12, and the aspheric surface data are shown in TABLE 13, wherein the units of the curvature radius, the thickness and the focal length are expressed in mm, and HFOV is half of the maximal field of view. 
     
       
         
           
               
             
               
                 TABLE 12 
               
             
            
               
                   
               
               
                 (Embodiment 5) 
               
               
                 f = 5.45 mm, Fno = 2.60, HFOV = 22.2 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                   
                   
                   
                   
                   
                   
                 Focal 
               
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Length 
               
               
                   
               
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 1 
                 Lens 1 
                 1.555 
                 ASP 
                 0.691 
                 Plastic 
                 1.544 
                 55.9 
                  2.58 
               
               
                 2 
                   
                 −12.292  
                 ASP 
                 0.030 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 3 
                 Stop 
                 Plano 
                 0.038 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 4 
                 Lens 2 
                 25.602  
                 ASP 
                 0.453 
                 Plastic 
                 1.640 
                 23.3 
                  −3.99 
               
               
                 5 
                   
                 2.303 
                 ASP 
                 0.464 
                   
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 10.423  
                 ASP 
                 0.285 
                 Plastic 
                 1.640 
                 23.3 
                 −40.69 
               
               
                 7 
                   
                 7.364 
                 ASP 
                 0.697 
                   
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 −2.296  
                 ASP 
                 0.397 
                 Plastic 
                 1.640 
                 55.8 
                 −18.41 
               
               
                 9 
                   
                 −3.045  
                 ASP 
                 0.035 
                   
                   
                   
                   
               
               
                 10  
                 Lens 5 
                 1.143 
                 ASP 
                 0.277 
                 Plastic 
                 1.530 
                 64.2 
                 419.32 
               
               
                 11  
                   
                 1.052 
                 ASP 
                 0.700 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 12  
                 IR-cut filter 
                 Plano 
                 0.300 
                 Plastic 
                 1.517 
                 — 
                   
               
               
                 13  
                   
                 Plano 
                 0.930 
                   
                   
                   
                   
               
               
                 14  
                 Image Surface 
                 Plano 
                 — 
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is d-line 587.6 nm 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 13 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
            
               
                 Surface # 
                 1 
                 2 
                 4 
                 5 
                 6 
               
               
                   
               
               
                 k = 
                 −7.0607E−02 
                 −9.0000E+01 
                 −9.0000E+01 
                 −9.5894E+00 
                 −1.6168E+01 
               
               
                 A4 = 
                 −1.8074E−02 
                 −4.4797E−02 
                 −1.1297E−01 
                 −9.8813E−02 
                 −3.3120E−01 
               
               
                 A6 = 
                   4.5793E−02 
                   1.4916E−01 
                   2.0929E−01 
                   2.0368E−01 
                   5.6082E−01 
               
               
                 A8 = 
                 −4.3725E−02 
                 −8.3454E−02 
                   3.6529E−02 
                 −2.5154E−01  
                 −1.7866E+00 
               
               
                 A10 = 
                 −3.9741E−02  
                 −2.1656E−02 
                 −2.5008E−01 
                   5.8187E−01 
                   4.9038E+00 
               
               
                 A12 = 
                   8.3236E−02 
                   3.9725E−02 
                   1.9812E−01 
                 −6.3252E−01 
                 −6.5868E+00 
               
               
                 A14 = 
                 −3.9467E−02 
                 −2.0521E−02 
                 −5.3635E−02 
                   2.7378E−01 
                   4.2475E+00 
               
               
                 A16 = 
                   
                   
                   
                   
                 −1.0962E+00 
               
               
                   
               
               
                 Surface # 
                 7 
                 8 
                 9 
                 10 
                 11 
               
               
                   
               
               
                 k = 
                   9.1633E+00 
                 −9.0000E+01 
                   7.6147E−01 
                 −9.7891E+00 
                 −6.0318E+00 
               
               
                 A4 = 
                 −1.6747E−01  
                 −1.0782E−01 
                   2.2250E−02 
                 −3.5220E−01  
                 −2.7516E−01 
               
               
                 A6 = 
                   2.1723E−01 
                   1.4456E−01 
                 −1.4888E−01 
                   9.7831E−02 
                   1.5583E−01 
               
               
                 A8 = 
                 −1.4581E−01  
                 −7.1287E−02 
                   2.8522E−01 
                   4.0737E−02 
                 −6.5002E−02 
               
               
                 A10 = 
                   5.9995E−01 
                   3.5977E−02  
                 −2.0153E−01  
                 −2.4635E−02 
                   1.9346E−02 
               
               
                 A12 = 
                 −6.3156E−01  
                 −2.5216E−02 
                   6.9552E−02 
                   4.6343E−03 
                 −4.4485E−03 
               
               
                 A14 = 
                   1.7956E−01 
                   1.0184E−02  
                 −1.1625E−02 
                 −3.6803E−04 
                   8.4115E−04 
               
               
                 A16 = 
                   
                 −1.4878E−03 
                   7.3728E−04 
                   1.1138E−05  
                 −7.4558E−05 
               
               
                   
               
            
           
         
       
     
     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 Table 14 below 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 12 and Table 13 and satisfy the conditions stated in Table 14. 
     
       
         
           
               
             
               
                 TABLE 14 
               
               
                   
               
               
                 5 th  Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 5.45 
                 f1/f4 
                 −0.14 
               
               
                 Fno 
                 2.60 
                 (|f/f4| + |f/f5|)/ 
                 1.98 
               
               
                 HFOV [deg.] 
                 22.2 
                 (|f/f1| + |f/f2|) 
                   
               
               
                 (V2 + V4)/V1 
                 0.83 
                 ImgH/(T23 + T34) 
                 2.37 
               
               
                 (T23 + T34)/(CT3 + CT4 + CT5) 
                 1.21 
                 f/ImgH 
                 0.91 
               
               
                 (CT2 + CT4)/(CT2 − CT4) 
                 15.18 
                 EPD/ImgH 
                 0.79 
               
               
                 CT4/CT3 
                 1.39 
                 SD/TD 
                 6.45 
               
               
                 (R7 + R8)/(R7 − R8) 
                 −7.13 
                 f/Yc52 
                 0.94 
               
               
                 |f/f1| + |f/f2| 
                 3.48 
                 EPD/(SD11 * 2) 
               
               
                   
               
            
           
         
       
     
     6th Embodiment 
       FIG. 6A  is a schematic view of an image capturing device according to the 6th embodiment of the present disclosure.  FIG. 6B  shows, in order from left to right, longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing device according to the 6th embodiment. 
     In  FIG. 6A , the image capturing device includes an imaging lens system (not otherwise herein labeled) of the present disclosure and an image sensor  680 . The imaging lens system includes, in order from an object side to an image side, a first lens element  610 , a second lens element  620 , a third lens element  630 , a fourth lens element  640 , and a fifth lens element  650 , wherein the imaging lens system has a total of five lens elements ( 610 - 650 ) with refractive power. 
     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 convex in a paraxial region thereof, which are both aspheric, and the first lens element  610  is made of plastic material. 
     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, which are both aspheric, and the second lens element  620  is made of plastic material. 
     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, which are both aspheric, and the third lens element  630  is made of plastic material. Furthermore, the object-side surface  631  of the third lens element  630  has at least one inflection point. 
     The fourth lens element  640  with negative refractive power has an object-side surface  641  being concave in a paraxial region thereof and an image-side surface  642  being convex in a paraxial region thereof, which are both aspheric, and the fourth lens element  640  is made of plastic material. 
     The fifth lens element  650  with negative refractive power has an object-side surface  651  being convex in a paraxial region thereof and an image-side surface  652  being concave in a paraxial region thereof, which are both aspheric, and the fifth lens element  650  is made of plastic material. Furthermore, each of the object-side surface  651  and the image-side surface  652  of the fifth lens element  650  has at least one inflection point. 
     The imaging lens system is further provided with a stop  600  disposed between the first lens element  610  and the second lens element  620 , and no lens element with refractive power is disposed between the stop  600  and the first lens element  610 . The imaging lens system further includes an IR-cut filter  660  placed between the fifth lens element  650  and an image surface  670 . The IR-cut filter  660  is made of glass and will not affect the focal length of the imaging lens system. The image sensor  680  is disposed on or near the image surface  670  of the imaging lens system. 
     The detailed optical data of the sixth embodiment are shown in TABLE 15, and the aspheric surface data are shown in TABLE 16, wherein the units of the curvature radius, the thickness and the focal length are expressed in mm, and HFOV is half of the maximal field of view. 
     
       
         
           
               
             
               
                 TABLE 15 
               
             
            
               
                   
               
               
                 (Embodiment 6) 
               
               
                 f = 7.58 mm, Fno = 2.40, HFOV = 21.3 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                   
                   
                   
                   
                   
                   
                 Focal 
               
               
                 Surface #  
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Length 
               
               
                   
               
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 1 
                 Lens 1 
                 2.108 
                 ASP 
                 0.956 
                 Plastic 
                 1.535 
                 55.7 
                  3.75 
               
               
                 2 
                   
                 −34.635  
                 ASP 
                 0.030 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 3 
                 Stop 
                 Plano 
                 0.030 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 4 
                 Lens 2 
                 5.884 
                 ASP 
                 0.539 
                 Plastic 
                 1.640 
                 23.3 
                 −4.73 
               
               
                 5 
                   
                 1.927 
                 ASP 
                 0.565 
                   
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 5.501 
                 ASP 
                 0.285 
                 Plastic 
                 1.535 
                 55.7 
                 31.34 
               
               
                 7 
                   
                 8.040 
                 ASP 
                 1.472 
                   
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 −3.297  
                 ASP 
                 0.403 
                 Plastic 
                 1.640 
                 23.3 
                 −44.84  
               
               
                 9 
                   
                 −3.903  
                 ASP 
                 0.059 
                   
                   
                   
                   
               
               
                 10  
                 Lens 5 
                 2.083 
                 ASP 
                 0.353 
                 Plastic 
                 1.535 
                 55.7 
                 −70.77  
               
               
                 11  
                   
                 1.858 
                 ASP 
                 0.980 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 12  
                 IR-cut filter 
                 Plano 
                 0.420 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 13  
                   
                 Plano 
                 1.458 
                   
                   
                   
                   
               
               
                 14  
                 Image Surface 
                 Plano 
                 — 
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is d-line 587.6 nm 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 16 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
            
               
                 Surface # 
                 1 
                 2 
                 4 
                 5 
                 6 
               
               
                   
               
               
                 k = 
                 −4.0994E−02 
                 −2.1565E+01 
                 −9.0000E+01 
                 −5.2674E+00 
                   8.0236E+00 
               
               
                 A4 = 
                 −4.6811E−03  
                 −1.6299E−02  
                 −4.0707E−02 
                 −3.0939E−02 
                 −1.2569E−01 
               
               
                 A6 = 
                   8.5275E−03 
                   2.8255E−02 
                   3.8704E−02 
                   4.0946E−02 
                   1.0357E−01 
               
               
                 A8 = 
                 −4.2634E−03  
                 −7.7794E−03 
                   3.5062E−03 
                 −2.2620E−02 
                 −1.6938E−01 
               
               
                 A10 = 
                 −1.9255E−03 
                 −1.0220E−03 
                 −1.2037E−02 
                   2.8417E−02 
                   2.3769E−01 
               
               
                 A12 = 
                   2.0855E−03 
                   1.0064E−03 
                   4.9111E−03 
                 −1.5533E−02  
                 −1.6243E−01 
               
               
                 A14 = 
                 −4.6972E−04 
                 −2.2863E−04 
                 −6.8378E−04 
                   3.5441E−03 
                   5.3596E−02 
               
               
                 A16 = 
                   
                   
                   
                   
                 −7.0428E−03 
               
               
                   
               
               
                 Surface # 
                 7 
                 8 
                 9 
                 10 
                 11 
               
               
                   
               
               
                 k = 
                   1.9244E+01 
                 −6.0379E+01 
                   8.0424E−01 
                 −1.5981E+01 
                 −8.5873E+00 
               
               
                 A4 = 
                 −6.0801E−02 
                 −4.4151E−02 
                   8.7878E−03 
                 −1.3034E−01 
                 −1.0389E−01 
               
               
                 A6 = 
                   4.1353E−02 
                   2.6590E−02 
                 −2.7771E−02 
                   1.8108E−02 
                   2.9122E−02 
               
               
                 A8 = 
                 −1.3744E−02 
                 −6.7969E−03  
                   2.6995E−02 
                   3.8575E−03 
                 −6.1082E−03 
               
               
                 A10 = 
                   2.8977E−02 
                   1.7432E−03 
                 −9.7559E−03 
                 −1.1921E−03 
                   9.4627E−04 
               
               
                 A12 = 
                 −1.5618E−02 
                 −6.2242E−04 
                   1.7176E−03 
                   1.1470E−04 
                 −1.0938E−04 
               
               
                 A14 = 
                   2.2697E−03 
                   1.2829E−04 
                 −1.4637E−04 
                 −4.5534E−06 
                   1.0332E−05 
               
               
                 A16 = 
                   
                 −9.5697E−06 
                   4.7594E−06 
                   7.1598E−08 
                 −5.1432E−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 Table 17 below 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 15 and Table 16 and satisfy the conditions stated in Table 17. 
     
       
         
           
               
             
               
                 TABLE 17 
               
               
                   
               
               
                 6 th  Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 7.58 
                 f1/f4 
                 −0.08 
               
               
                 Fno 
                 2.40 
                 (|f/f4| + |f/f5|)/ 
                 0.08 
               
               
                 HFOV [deg.] 
                 21.3 
                 (|f/f1| + |f/f2|) 
                   
               
               
                 (V2 + V4)/V1 
                 0.83 
                 ImgH/(T23 + T34) 
                 1.57 
               
               
                 (T23 + T34)/(CT3 + CT4 + CT5) 
                 1.96 
                 f/ImgH 
                 2.37 
               
               
                 (CT2 + CT4)/(CT2 − CT4) 
                 6.93 
                 EPD/ImgH 
                 0.99 
               
               
                 CT4/CT3 
                 1.41 
                 SD/TD 
                 0.79 
               
               
                 (R7 + R8)/(R7 − R8) 
                 −11.89 
                 f/Yc52 
                 7.32 
               
               
                 |f/f1| + |f/f2| 
                 3.62 
                 EPD/(SD11 * 2) 
                 0.97 
               
               
                   
               
            
           
         
       
     
     7th Embodiment 
       FIG. 7A  is a schematic view of an image capturing device according to the 7th embodiment of the present disclosure.  FIG. 7B  shows, in order from left to right, longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing device according to the 7th embodiment. 
     In  FIG. 7A , the image capturing device includes an imaging lens system (not otherwise herein labeled) of the present disclosure and an image sensor  780 . The imaging lens system includes, in order from an object side to an image side, a first lens element  710 , a second lens element  720 , a third lens element  730 , a fourth lens element  740 , and a fifth lens element  750 , wherein the imaging lens system has a total of five lens elements ( 710 - 750 ) with refractive power. 
     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 convex in a paraxial region thereof, which are both aspheric, and the first lens element  710  is made of glass. 
     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, which are both aspheric, and the second lens element  720  is made of plastic material. 
     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, which are both aspheric, and the third lens element  730  is made of plastic material. Furthermore, the object-side surface  731  of the third lens element  730  has at least one inflection point. 
     The fourth lens element  740  with negative refractive power has an object-side surface  741  being concave in a paraxial region thereof and an image-side surface  742  being convex in a paraxial region thereof, which are both aspheric, and the fourth lens element  740  is made of plastic material. 
     The fifth lens element  750  with positive refractive power has an object-side surface  751  being convex in a paraxial region thereof and an image-side surface  752  being concave in a paraxial region thereof, which are both aspheric, and the fifth lens element  750  is made of plastic material. Furthermore, each of the object-side surface  751  and the image-side surface  752  of the fifth lens element  750  has at least one inflection point. 
     The imaging lens system is further provided with a stop  700  disposed between an imaged object and the first lens element  710 , and no lens element with refractive power is disposed between the stop  700  and the first lens element  710 . The imaging lens system further includes an IR-cut filter  760  placed between the fifth lens element  750  and an image surface  770 . The IR-cut filter  760  is made of glass and will not affect the focal length of the imaging lens system. The image sensor  780  is disposed on or near the image surface  770  of the imaging lens system. 
     The detailed optical data of the seventh embodiment are shown in TABLE 18, and the aspheric surface data are shown in TABLE 19, wherein the units of the curvature radius, the thickness and the focal length are expressed in mm, and HFOV is half of the maximal field of view. 
     
       
         
           
               
             
               
                 TABLE 18 
               
             
            
               
                   
               
               
                 (Embodiment 7) 
               
               
                 f = 8.51 mm, Fno = 2.70, HFOV = 19.5 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                   
                   
                   
                   
                   
                   
                 Focal 
               
               
                 Surface #  
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Length 
               
               
                   
               
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 Stop 
                 Plano 
                 −0.630  
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 2 
                 Lens 1 
                 2.109 
                 ASP 
                 0.996 
                 Glass 
                 1.540 
                 59.7 
                  3.84 
               
               
                 3 
                   
                 −103.049   
                 ASP 
                 0.071 
                   
                   
                   
                   
               
               
                 4 
                 Lens 2 
                 5.821 
                 ASP 
                 0.513 
                 Plastic  
                 1.640 
                 23.3 
                 −5.37 
               
               
                 5 
                   
                 2.086 
                 ASP 
                 0.492 
                   
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 5.986 
                 ASP 
                 0.301 
                 Plastic 
                 1.530 
                 55.8 
                 1357.35  
               
               
                 7 
                   
                 5.932 
                 ASP 
                 1.687 
                   
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 −3.393  
                 ASP 
                 0.414 
                 Plastic 
                 1.640 
                 23.3 
                 −11.01  
               
               
                 9 
                   
                 −6.859  
                 ASP 
                 0.320 
                   
                   
                   
                   
               
               
                 10  
                 Lens 5 
                 1.628 
                 ASP 
                 0.457 
                 Plastic 
                 1.535 
                 55.7 
                 38.81 
               
               
                 11  
                   
                 1.594 
                 ASP 
                 0.980 
                   
                   
                   
                 — 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 12  
                 IR-cut filter 
                 Plano 
                 0.420 
                 Glass 
                 1.517 
                 64.2 
                   
               
               
                 13  
                   
                 Plano 
                 1.188 
                   
                   
                   
                   
               
               
                 14  
                 Image Surface 
                 Plano 
                 — 
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is d-line 587.6 nm 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 19 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
            
               
                 Surface # 
                 2 
                 3 
                 4 
                 5 
                 6 
               
               
                   
               
               
                 k = 
                 −3.4144E−02 
                 −4.3275E+01 
                 −6.0449E+01 
                 −6.2195E+00 
                 7.8926E+00 
               
               
                 A4 = 
                 −5.3880E−03  
                 −1.6981E−02 
                 −4.2064E−02 
                 −3.8937E−02  
                 −1.2756E−01 
               
               
                 A6 = 
                   8.8986E−03 
                   2.7806E−02 
                   3.9066E−02 
                   4.2143E−02 
                   1.0593E−01 
               
               
                 A8 = 
                 −4.2494E−03  
                 −7.9366E−03 
                   3.6437E−03 
                 −2.2376E−02 
                 −1.6945E−01 
               
               
                 A10 = 
                 −1.9306E−03 
                 −1.0533E−03 
                 −1.2032E−02 
                   2.8573E−02 
                   2.3771E−01 
               
               
                 A12 = 
                   2.0850E−03 
                   1.0057E−03  
                   4.8922E−03 
                 −1.5207E−02  
                 −1.6244E−01 
               
               
                 A14 = 
                 −4.6613E−04 
                 −2.2688E−04 
                 −6.9478E−04 
                   3.8011E−03 
                   5.3586E−02 
               
               
                 A16 = 
                   
                   
                   
                   
                 −7.0337E−03 
               
               
                   
               
               
                 Surface # 
                 7 
                 8 
                 9 
                 10 
                 11 
               
               
                   
               
               
                 k = 
                   1.6310E+01 
                 −9.0000E+01 
                   1.8497E+00 
                 −1.4689E+01 
                 −1.3814E+01 
               
               
                 A4 = 
                 −4.8105E−02 
                 −3.8958E−02 
                   5.1462E−03 
                 −1.2940E−01 
                 −1.0435E−01 
               
               
                 A6 = 
                   3.8256E−02 
                   2.6473E−02  
                 −2.7854E−02 
                   1.8326E−02 
                   2.9377E−02 
               
               
                 A8 = 
                 −1.4672E−02 
                 −6.9046E−03 
                   2.6987E−02 
                   3.8856E−03 
                 −6.0490E−03 
               
               
                 A10 = 
                   2.8493E−02 
                   1.7517E−03  
                 −9.7577E−03  
                 −1.1885E−03  
                   9.5392E−04 
               
               
                 A12 = 
                 −1.6010E−02 
                 −6.1827E−04 
                   1.7171E−03 
                   1.1511E−04 
                 −1.0860E−04 
               
               
                 A14 = 
                   2.0586E−03 
                   1.2833E−04  
                 −1.4637E−04  
                 −4.5274E−06  
                   1.0394E−05 
               
               
                 A16 = 
                   
                 −9.5735E−06 
                   4.8790E−06 
                   7.1598E−08 
                 −5.1082E−07 
               
               
                   
               
            
           
         
       
     
     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 Table 20 below 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 18 and Table 19 and satisfy the conditions stated in Table 20. 
     
       
         
           
               
             
               
                 TABLE 20 
               
               
                   
               
               
                 7 th  Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 8.51 
                 f1/f4 
                 −0.35 
               
               
                 Fno 
                 2.70 
                 (|f/f4| + |f/f5|)/ 
                 0.26 
               
               
                 HFOV [deg.] 
                 19.5 
                 (|f/f1| + |f/f2|) 
                   
               
               
                 (V2 + V4)/V1 
                 0.78 
                 ImgH/(T23 + T34) 
                 1.47 
               
               
                 (T23 + T34)/(CT3 + CT4 + CT5) 
                 1.86 
                 f/ImgH 
                 2.66 
               
               
                 (CT2 + CT4)/(CT2 − CT4) 
                 9.36 
                 EPD/ImgH 
                 0.99 
               
               
                 CT4/CT3 
                 1.38 
                 SD/TD 
                 0.88 
               
               
                 (R7 + R8)/(R7 − R8) 
                 −2.96 
                 f/Yc52 
                 8.91 
               
               
                 |f/f1| + |f/f2| 
                 3.80 
                 EPD/(SD11 * 2) 
                 0.98 
               
               
                   
               
            
           
         
       
     
     8th Embodiment 
       FIG. 8A  is a schematic view of an image capturing device according to the 8th embodiment of the present disclosure.  FIG. 8B  shows, in order from left to right, longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing device according to the 8th embodiment. 
     In  FIG. 8A , the image capturing device includes an imaging lens system (not otherwise herein labeled) of the present disclosure and an image sensor  880 . The imaging lens system includes, in order from an object side to an image side, a first lens element  810 , a second lens element  820 , a third lens element  830 , a fourth lens element  840 , and a fifth lens element  850 , wherein the imaging lens system has a total of five lens elements ( 810 - 850 ) with refractive power. 
     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 convex in a paraxial region thereof, which are both aspheric, and the first lens element  810  is made of plastic material. 
     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, which are both aspheric, and the second lens element  820  is made of plastic material. 
     The third lens element  830  with positive refractive power has an object-side surface  831  being concave in a paraxial region thereof and an image-side surface  832  being convex in a paraxial region thereof, which are both aspheric, and the third lens element  830  is made of plastic material. Furthermore, each of the object-side surface  831  and the image-side surface  832  of the third lens element  830  has at least one inflection point. 
     The fourth lens element  840  with negative refractive power has an object-side surface  841  being concave in a paraxial region thereof and an image-side surface  842  being convex in a paraxial region thereof, which are both aspheric, and the fourth lens element  840  is made of plastic material. 
     The fifth lens element  850  with positive refractive power has an object-side surface  851  being convex in a paraxial region thereof and an image-side surface  852  being concave in a paraxial region thereof, which are both aspheric, and the fifth lens element  850  is made of plastic material. Furthermore, each of the object-side surface  851  and the image-side surface  852  of the fifth lens element  850  has at least one inflection point. 
     The imaging lens system is further provided with a stop  800  disposed between an imaged object and the first lens element  810 , and no lens element with refractive power is disposed between the stop  800  and the first lens element  810 . The imaging lens system further includes an IR-cut filter  860  placed between the fifth lens element  850  and an image surface  870 . The IR-cut filter  860  is made of glass and will not affect the focal length of the imaging lens system. The image sensor  880  is disposed on or near the image surface  870  of the imaging lens system. 
     The detailed optical data of the eighth embodiment are shown in TABLE 21, and the aspheric surface data are shown in TABLE 22, wherein the units of the curvature radius, the thickness and the focal length are expressed in mm, and HFOV is half of the maximal field of view. 
     
       
         
           
               
             
               
                 TABLE 21 
               
             
            
               
                   
               
               
                 (Embodiment 8) 
               
               
                 f = 4.92 mm, Fno = 2.25, HFOV = 24.5 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                   
                   
                   
                   
                   
                   
                 Focal 
               
               
                 Surface #  
                   
                 Curvature Radius  
                 Thickness 
                 Material  
                 Index 
                 Abbe # 
                 Length 
               
               
                   
               
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 Stop 
                 Plano 
                 −0.360  
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 2 
                 Lens 1 
                 1.603 
                 ASP 
                 0.695 
                 Plastic 
                 1.544 
                 55.9 
                  2.60 
               
               
                 3 
                   
                 −10.368  
                 ASP 
                 0.035 
                   
                   
                   
                   
               
               
                 4 
                 Lens 2 
                 7.128 
                 ASP 
                 0.527 
                 Plastic 
                 1.639 
                 23.5 
                 −3.49 
               
               
                 5 
                   
                 1.648 
                 ASP 
                 0.491 
                   
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 −100.000   
                 ASP 
                 0.250 
                 Plastic 
                 1.544 
                 55.9 
                 16.32 
               
               
                 7 
                   
                 −8.162  
                 ASP 
                 0.856 
                   
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 −1.809  
                 ASP 
                 0.301 
                 Plastic 
                 1.639 
                 23.5 
                 −9.54 
               
               
                 9 
                   
                 −2.740  
                 ASP 
                 0.045 
                   
                   
                   
                   
               
               
                 10  
                 Lens 5 
                 1.236 
                 ASP 
                 0.400 
                 Plastic 
                 1.544 
                 55.9 
                 167.93  
               
               
                 11  
                   
                 1.110 
                 ASP 
                 0.700 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 12  
                 IR-cut filter 
                 Plano 
                 0.300 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 13  
                   
                 Plano 
                 0.380 
                   
                   
                   
                   
               
               
                 14  
                 Image Surface 
                 Plano 
                 — 
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is d-line 587.6 nm 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 22 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
            
               
                 Surface # 
                 2 
                 3 
                 4 
                 5 
                 6 
               
               
                   
               
               
                 k = 
                 −1.0253E−01 
                 −7.2599E+01 
                   1.1072E+01 
                 −4.1405E+00 
                   1.0000E+00 
               
               
                 A4 = 
                 −7.1393E−03  
                 −5.0447E−02  
                 −1.2313E−01  
                 −3.6384E−02  
                 −2.4235E−01 
               
               
                 A6 = 
                   2.8398E−02 
                   1.4433E−01 
                   2.0471E−01 
                   2.1781E−01 
                   5.7736E−01 
               
               
                 A8 = 
                 −4.4376E−02  
                 −8.6861E−02 
                   3.3569E−02 
                 −2.4767E−01 
                 −1.7628E+00 
               
               
                 A10 = 
                 −3.4746E−02 
                 −2.1151E−02  
                 −2.5376E−01  
                   5.8509E−01 
                   4.8940E+00 
               
               
                 A12 = 
                   8.6725E−02 
                   4.1788E−02 
                   1.9582E−01 
                 −6.4001E−01 
                 −6.5984E+00 
               
               
                 A14 = 
                 −4.1331E−02 
                 −1.9505E−02  
                 −5.3158E−02  
                   2.4702E−01 
                   4.2486E+00 
               
               
                 A16 = 
                   
                   
                   
                   
                 −1.0814E+00 
               
               
                   
               
               
                 Surface # 
                 7 
                 8 
                 9 
                 10 
                 11 
               
               
                   
               
               
                 k = 
                 −8.5266E+01 
                 −5.5479E+01 
                 −4.5864E−01 
                 −1.8517E+01 
                 −8.7647E+00 
               
               
                 A4 = 
                 −1.4402E−01 
                 −1.0539E−01 
                   3.4370E−02 
                 −3.3564E−01  
                 −2.1543E−01 
               
               
                 A6 = 
                   2.1785E−01 
                   1.4362E−01 
                 −1.5383E−01 
                   9.5699E−02 
                   1.1507E−01 
               
               
                 A8 = 
                 −1.4243E−01 
                 −7.2195E−02  
                   2.8531E−01 
                   3.9945E−02 
                 −5.4818E−02 
               
               
                 A10 = 
                   6.0477E−01 
                   3.5487E−02 
                 −2.0132E−01 
                 −2.4753E−02 
                   2.1410E−02 
               
               
                 A12 = 
                 −6.2859E−01 
                 −2.5351E−02  
                   6.9493E−02 
                   4.6732E−03 
                 −5.6664E−03 
               
               
                 A14 = 
                   1.7921E−01  
                   1.0178E−02 
                 −1.1651E−02 
                 −3.7053E−04  
                   8.3340E−04 
               
               
                 A16 = 
                   
                 −1.4649E−03 
                   7.3788E−04  
                   1.1138E−05 
                 −4.7748E−05 
               
               
                   
               
            
           
         
       
     
     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 Table 23 below 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 21 and Table 22 and satisfy the conditions stated in Table 23. 
     
       
         
           
               
             
               
                 TABLE 23 
               
               
                   
               
               
                 8 th  Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 4.92 
                 f1/f4 
                 −0.27 
               
               
                 Fno 
                 2.25 
                 (|f/f4| + |f/f5|)/ 
                 0.17 
               
               
                 HFOV [deg.] 
                 24.5 
                 (|f/f1| + |f/f2|) 
                   
               
               
                 (V2 + V4)/V1 
                 0.84 
                 ImgH/(T23 + T34) 
                 1.71 
               
               
                 (T23 + T34)/(CT3 + CT4 + CT5) 
                 1.42 
                 f/ImgH 
                 2.14 
               
               
                 (CT2 + CT4)/(CT2 − CT4) 
                 3.66 
                 EPD/ImgH 
                 0.95 
               
               
                 CT4/CT3 
                 1.20 
                 SD/TD 
                 0.90 
               
               
                 (R7 + R8)/(R7 − R8) 
                 −4.89 
                 f/Yc52 
                 5.75 
               
               
                 |f/f1| + |f/f2| 
                 3.30 
                 EPD/(SD11 * 2) 
                 0.98 
               
               
                   
               
            
           
         
       
     
     9th Embodiment 
       FIG. 9A  is a schematic view of an image capturing device according to the 9th embodiment of the present disclosure.  FIG. 9B  shows, in order from left to right, longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing device according to the 9th embodiment. 
     In  FIG. 9A , the image capturing device includes an imaging lens system (not otherwise herein labeled) of the present disclosure and an image sensor  980 . The imaging lens system includes, in order from an object side to an image side, a first lens element  910 , a second lens element  920 , a third lens element  930 , a fourth lens element  940 , and a fifth lens element  950 , wherein the imaging lens system has a total of five lens elements ( 910 - 950 ) with refractive power. 
     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, which are both aspheric, and the first lens element  910  is made of plastic material. 
     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, which are both aspheric, and the second lens element  920  is made of plastic material. 
     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, which are both aspheric, and the third lens element  930  is made of plastic material. Furthermore, the object-side surface  931  of the third lens element  930  has at least one inflection point. 
     The fourth lens element  940  with negative refractive power has an object-side surface  941  being concave in a paraxial region thereof and an image-side surface  942  being convex in a paraxial region thereof, which are both aspheric, and the fourth lens element  940  is made of plastic material. 
     The fifth lens element  950  with negative refractive power has an object-side surface  951  being convex in a paraxial region thereof and an image-side surface  952  being concave in a paraxial region thereof, which are both aspheric, and the fifth lens element  950  is made of plastic material. Furthermore, each of the object-side surface  951  and the image-side surface  952  of the fifth lens element  950  has at least one inflection point. 
     The imaging lens system is further provided with a stop  900  disposed between an imaged object and the first lens element  910 , and no lens element with refractive power is disposed between the stop  900  and the first lens element  910 . The imaging lens system further includes an IR-cut filter  960  placed between the fifth lens element  950  and an image surface  970 . The IR-cut filter  960  is made of glass and will not affect the focal length of the imaging lens system. The image sensor  980  is disposed on or near the image surface  970  of the imaging lens system. 
     The detailed optical data of the ninth embodiment are shown in TABLE 24, and the aspheric surface data are shown in TABLE 25, wherein the units of the curvature radius, the thickness and the focal length are expressed in mm, and HFOV is half of the maximal field of view. 
     
       
         
           
               
             
               
                 TABLE 24 
               
             
            
               
                   
               
               
                 (Embodiment 9) 
               
               
                 f = 4.60 mm, Fno = 2.25, HFOV = 26.1 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                   
                   
                   
                   
                   
                   
                 Focal 
               
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index  
                 Abbe # 
                 Length 
               
               
                   
               
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 Stop 
                 Plano 
                 −0.360  
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 2 
                 Lens 1 
                 1.494 
                 ASP 
                 0.646 
                 Plastic 
                 1.544 
                 55.9 
                  2.79 
               
               
                 3 
                   
                 82.713  
                 ASP 
                 0.055 
                   
                   
                   
                   
               
               
                 4 
                 Lens 2 
                 2.938 
                 ASP 
                 0.288 
                 Plastic 
                 1.639 
                 23.5 
                  −4.26 
               
               
                 5 
                   
                 1.359 
                 ASP 
                 0.882 
                   
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 100.000  
                 ASP 
                 0.307 
                 Plastic 
                 1.544 
                 55.9 
                  8.79 
               
               
                 7 
                   
                 −5.016  
                 ASP 
                 0.170 
                   
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 −1.114  
                 ASP 
                 0.300 
                 Plastic 
                 1.639 
                 23.5 
                 −70.51 
               
               
                 9 
                   
                 −1.262  
                 ASP 
                 0.288 
                   
                   
                   
                   
               
               
                 10  
                 Lens 5 
                 1.963 
                 ASP 
                 0.490 
                 Plastic 
                 1.544 
                 55.9 
                 −12.44 
               
               
                 11  
                   
                 1.388 
                 ASP 
                 0.700 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 12  
                 IR-cut filter 
                 Plano 
                 0.300 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 13  
                   
                 Plano 
                 0.548 
                   
                   
                   
                   
               
               
                 14  
                 Image Surface 
                 Plano 
                 — 
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is d-line 587.6 nm 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 25 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
            
               
                 Surface # 
                 2 
                 3 
                 4 
                 5 
                 6 
               
               
                   
               
               
                 k = 
                 −9.3626E−02 
                   2.0000E+01 
                 −2.1714E+01 
                 −3.6218E+00 
                   1.0000E+00 
               
               
                 A4 = 
                   7.8555E−04 
                 −8.3642E−02 
                 −1.1013E−01  
                   2.8869E−02 
                 −8.1038E−02 
               
               
                 A6 = 
                   2.0832E−02 
                   1.3573E−01  
                   1.3978E−01 
                   6.4898E−02 
                 −7.9840E−02 
               
               
                 A8 = 
                 −3.4772E−02  
                 −8.6292E−02 
                 2.5141E−02 
                   1.4436E−01 
                 −2.3333E−01 
               
               
                 A10 =  
                 −2.6585E−02 
                 −1.9624E−02 
                 −1.6020E−01  
                 −2.2024E−01  
                   6.9395E−01 
               
               
                 A12 = 
                   8.4710E−02  
                   4.1441E−02 
                   1.0144E−01  
                   1.1647E−01 
                 −8.7228E−01 
               
               
                 A14 = 
                 −5.1340E−02 
                 −2.0803E−02 
                 −1.1777E−02 
                   3.5447E−02 
                   5.0337E−01 
               
               
                 A16 = 
                   
                   
                   
                   
                 −1.1288E−01 
               
               
                   
               
               
                 Surface # 
                 7 
                 8 
                 9 
                 10 
                 11 
               
               
                   
               
               
                 k = 
                   1.0098E+01 
                 −7.3671E+00 
                 −7.2330E−01 
                 −2.1120E+01 
                 −8.2277E+00 
               
               
                 A4 = 
                   3.6441E−02 
                 −2.3904E−01  
                   4.4522E−02  
                 −1.7965E−01  
                 −1.3070E−01 
               
               
                 A6 = 
                 −1.1569E−01 
                   7.7734E−01 
                   2.1960E−01  
                   1.0024E−01 
                   6.6308E−02 
               
               
                 A8 = 
                   4.6691E−02  
                 −1.2095E+00 
                 −3.4449E−01 
                 −5.4730E−02  
                 −3.1237E−02 
               
               
                 A10 = 
                 −1.6742E−02 
                   1.1413E+00 
                   2.8848E−01 
                   2.6630E−02 
                   1.0794E−02 
               
               
                 A12 = 
                   1.2441E−03 
                 −6.1794E−01 
                 −1.1085E−01 
                 −7.3097E−03 
                 −2.4103E−03 
               
               
                 A14 = 
                   2.4424E−03  
                   1.7823E−01 
                   1.6437E−02  
                   9.7659E−04 
                   3.0722E−04 
               
               
                 A16 = 
                   
                 −2.1565E−02 
                 −3.8674E−04 
                 −4.9765E−05 
                 −1.6070E−05 
               
               
                   
               
            
           
         
       
     
     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 Table 26 below 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 24 and Table 25 and satisfy the conditions stated in Table 26. 
     
       
         
           
               
             
               
                 TABLE 26 
               
               
                   
               
               
                 9 th  Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 4.60 
                 f1/f4 
                 −0.04 
               
               
                 Fno 
                 2.25 
                 (|f/f4| + |f/f5|)/ 
                 0.16 
               
               
                 HFOV [deg.] 
                 26.1 
                 (|f/f1| + |f/f2|) 
                   
               
               
                 (V2 + V4)/V1 
                 0.84 
                 ImgH/(T23 + T34) 
                 2.19 
               
               
                 (T23 + T34)/(CT3 + CT4 + CT5) 
                 0.96 
                 f/ImgH 
                 2.00 
               
               
                 (CT2 + CT4)/(CT2 − CT4) 
                 −49.00 
                 EPD/ImgH 
                 0.89 
               
               
                 CT4/CT3 
                 0.98 
                 SD/TD 
                 0.89 
               
               
                 (R7 + R8)/(R7 − R8) 
                 −16.04 
                 f/Yc52 
                 4.32 
               
               
                 |f/f1| + |f/f2| 
                 2.73 
                 EPD/(SD11 * 2) 
                 0.98 
               
               
                   
               
            
           
         
       
     
     10th Embodiment 
       FIG. 10A  is a schematic view of an image capturing device according to the 10th embodiment of the present disclosure.  FIG. 10B  shows, in order from left to right, longitudinal spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing device according to the 10th embodiment. 
     In  FIG. 10A , the image capturing device includes an imaging lens system (not otherwise herein labeled) of the present disclosure and an image sensor  1080 . The imaging lens system includes, in order from an object side to an image side, a first lens element  1010 , a second lens element  1020 , a third lens element  1030 , a fourth lens element  1040 , and a fifth lens element  1050 , wherein the imaging lens system has a total of five lens elements ( 1010 - 1050 ) with refractive power. 
     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, which are both aspheric, and the first lens element  1010  is made of plastic material. 
     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, which are both aspheric, and the second lens element  1020  is made of plastic material. 
     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, which are both aspheric, and the third lens element  1030  is made of plastic material. Furthermore, each of the object-side surface  1031  and the image-side surface  1032  of the third lens element  1030  has at least one inflection point. 
     The fourth lens element  1040  with positive refractive power has an object-side surface  1041  being concave in a paraxial region thereof and an image-side surface  1042  being convex in a paraxial region thereof, which are both aspheric, and the fourth lens element  1040  is made of plastic material. 
     The fifth lens element  1050  with negative refractive power has an object-side surface  1051  being convex in a paraxial region thereof and an image-side surface  1052  being concave in a paraxial region thereof, which are both aspheric, and the fifth lens element  1050  is made of plastic material. Furthermore, each of the object-side surface  1051  and the image-side surface  1052  of the fifth lens element  1050  has at least one inflection point. 
     The imaging lens system is further provided with a stop  1000  disposed between an imaged object and the first lens element  1010 , and no lens element with refractive power is disposed between the stop  1000  and the first lens element  1010 . The imaging lens system further includes an IR-cut filter  1060  placed between the fifth lens element  1050  and an image surface  1070 . The IR-cut filter  1060  is made of glass and will not affect the focal length of the imaging lens system. The image sensor  1080  is disposed on or near the image surface  1070  of the imaging lens system. 
     The detailed optical data of the tenth embodiment are shown in TABLE 27, and the aspheric surface data are shown in TABLE 28, wherein the units of the curvature radius, the thickness and the focal length are expressed in mm, and HFOV is half of the maximal field of view. 
     
       
         
           
               
             
               
                 TABLE 27 
               
             
            
               
                   
               
               
                 (Embodiment 10) 
               
               
                 f = 5.38 mm, Fno = 2.50, HFOV = 21.8 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                   
                   
                   
                   
                   
                   
                 Focal 
               
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Length 
               
               
                   
               
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 Stop 
                 Plano 
                 −0.360  
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 2 
                 Lens 1 
                 1.559 
                 ASP 
                 0.683 
                 Plastic 
                 1.544 
                 55.9 
                  2.94 
               
               
                 3 
                   
                 51.241  
                 ASP 
                 0.040 
                   
                   
                   
                   
               
               
                 4 
                 Lens 2 
                 3.732 
                 ASP 
                 0.438 
                 Plastic 
                 1.634 
                 23.8 
                 −4.25 
               
               
                 5 
                   
                 1.493 
                 ASP 
                 0.402 
                   
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 9.507 
                 ASP 
                 0.319 
                 Plastic 
                 1.544 
                 55.9 
                 15.68 
               
               
                 7 
                   
                 −82.417  
                 ASP 
                 0.880 
                   
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 −2.158  
                 ASP 
                 0.415 
                 Plastic 
                 1.544 
                 55.9 
                 48.21 
               
               
                 9 
                   
                 −2.129  
                 ASP 
                 0.240 
                   
                   
                   
                   
               
               
                 10  
                 Lens 5 
                 10.480  
                 ASP 
                 0.364 
                 Plastic 
                 1.634 
                 23.8 
                 −7.84 
               
               
                 11  
                   
                 3.325 
                 ASP 
                 0.700 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 12  
                 IR-cut filter 
                 Plano 
                 0.210 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 13  
                   
                 Plano 
                 0.703 
                   
                   
                   
                   
               
               
                 14  
                 Image Surface 
                 Plano 
                 — 
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is d-line 587.6 nm 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 28 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
            
               
                 Surface # 
                 2 
                 3 
                 4 
                 5 
                 6 
               
               
                   
               
               
                 k = 
                 −7.3860E−02 
                 −9.0000E+01 
                 −4.6096E+01 
                 −5.9010E+00 
                 −9.0000E+01 
               
               
                 A4 = 
                 −3.1740E−03 
                 −6.0369E−02 
                 −1.1147E−01 
                 −6.3352E−02 
                 −2.9902E−01 
               
               
                 A6 = 
                   3.5648E−02 
                   1.4360E−01 
                   2.0409E−01 
                   2.2776E−01 
                   5.9401E−01 
               
               
                 A8 = 
                 −4.5503E−02 
                 −8.6641E−02 
                   3.2756E−02 
                 −2.3686E−01 
                 −1.7728E+00 
               
               
                 A10 = 
                 −3.6188E−02 
                 −2.1269E−02 
                 −2.5326E−01 
                   5.8897E−01 
                   4.9037E+00 
               
               
                 A12 = 
                   8.6312E−02 
                   4.1585E−02 
                   1.9645E−01 
                 −6.3571E−01 
                 −6.5923E+00 
               
               
                 A14 = 
                 −4.0934E−02 
                 −1.9558E−02 
                 −5.2856E−02 
                   2.5615E−01 
                   4.2448E+00 
               
               
                 A16 = 
                   
                   
                   
                   
                 −1.0781E+00 
               
               
                   
               
               
                 Surface # 
                 7 
                 8 
                 9 
                 10 
                 11 
               
               
                   
               
               
                 k = 
                   2.0000E+01 
                 −1.1650E+01 
                   3.5889E−01 
                 −3.7416E+01 
                 −2.8637E+01 
               
               
                 A4 = 
                 −1.4325E−01 
                 −1.4294E−01  
                   4.1185E−02  
                 −3.4929E−01  
                 −2.9034E−01 
               
               
                 A6 = 
                   2.0750E−01  
                   1.3965E−01 
                 −1.5228E−01 
                   9.6210E−02 
                   1.5588E−01 
               
               
                 A8 = 
                 −1.3892E−01 
                 −7.0446E−02  
                   2.8529E−01 
                   4.0474E−02 
                 −6.4132E−02 
               
               
                 A10 = 
                   6.0949E−01  
                   3.6697E−02 
                 −2.0162E−01 
                 −2.4638E−02 
                   1.9477E−02 
               
               
                 A12 = 
                 −6.2432E−01 
                 −2.4991E−02 
                   6.9491E−02  
                   4.6654E−03 
                 −4.3998E−03 
               
               
                 A14 = 
                   1.8408E−01  
                   1.0121E−02 
                 −1.1659E−02 
                 −3.4958E−04 
                   8.4542E−04 
               
               
                 A16 = 
                   
                 −1.7097E−03 
                   7.1893E−04 
                   1.1138E−05  
                 −7.7827E−05 
               
               
                   
               
            
           
         
       
     
     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 Table 29 below 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 27 and Table 28 and satisfy the conditions stated in Table 29. 
     
       
         
           
               
             
               
                 TABLE 29 
               
               
                   
               
               
                 10 th  Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 5.38 
                 f1/f4 
                 0.06 
               
               
                 Fno 
                 2.50 
                 (|f/f4| + |f/f5|)/ 
                 0.26 
               
               
                 HFOV [deg.] 
                 21.8 
                 (|f/f1| + |f/f2|) 
                   
               
               
                 (V2 + V4)/V1 
                 1.43 
                 ImgH/(T23 + T34) 
                 1.79 
               
               
                 (T23 + T34)/(CT3 + CT4 + CT5) 
                 1.17 
                 f/ImgH 
                 2.34 
               
               
                 (CT2 + CT4)/(CT2 − CT4) 
                 37.09 
                 EPD/ImgH 
                 0.94 
               
               
                 CT4/CT3 
                 1.30 
                 SD/TD 
                 0.90 
               
               
                 (R7 + R8)/(R7 − R8) 
                 148.39 
                 f/Yc52 
                 10.86 
               
               
                 |f/f1| + |f/f2| 
                 3.10 
                 EPD/(SD11 * 2) 
                 0.97 
               
               
                   
               
            
           
         
       
     
     The foregoing description, for purpose of explanation, has been described with reference to specific embodiments. It is to be noted that TABLES 1-29 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.