Patent Publication Number: US-11656441-B2

Title: Imaging optical lens assembly, imaging apparatus and electronic device

Description:
RELATED APPLICATIONS 
     The present application is a continuation of the application Ser. No. 16/788,476, filed Feb. 12, 2020, which is a continuation of the application Ser. No. 16/282,434, filed Feb. 22, 2019, U.S. Pat. No. 10,598,904 issued on Mar. 24, 2020, which is a continuation of the application Ser. No. 15/822,582, filed Nov. 27, 2017, U.S. Pat. No. 10,254,513 issued on Apr. 9, 2019, which is a continuation of the application Ser. No. 14/684,516, filed Apr. 13, 2015, U.S. Pat. No. 9,857,559 issued on Jan. 2, 2018, which claims priority to Taiwan Application Serial Number 103146323, filed Dec. 30, 2014, the entire contents of which are hereby incorporated herein by reference. 
    
    
     BACKGROUND 
     Technical Field 
     The present disclosure relates to an imaging optical lens assembly and an imaging apparatus. More particularly, the present disclosure relates to a compact imaging optical lens assembly and an imaging apparatus which is applicable to electronic devices. 
     Description of Related Art 
     In recent years, with the popularity of mobile terminals having camera functionalities, the demand of miniaturized optical systems has been increasing. The sensor of a conventional optical system is typically a CCD (Charge-Coupled Device) or a CMOS (Complementary Metal-Oxide-Semiconductor) sensor. As the advanced semiconductor manufacturing technologies have allowed the pixel size of sensors to be reduced and compact optical systems have gradually evolved toward the field of higher megapixels, there Is an Increasing demand for compact optical systems featuring better image quality. 
     Conventional constructions of telephoto optical systems are mainly equipped with multiple spherical glass lens elements. The lens size of these systems becomes too large to carry, and the costs of manufacturing these systems become too high. Hence, the conventional optical systems cannot satisfy these photographic requirements of convenience and multi-functions. 
     SUMMARY 
     According to one aspect of the present disclosure, an imaging optical lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The first lens element with positive refractive power has a convex object-side surface. The second lens element has negative refractive power. The third lens element with refractive power has both an object-side surface and an image-side surface being aspheric. The fourth lens element with refractive power has both an object-side surface and an image-side surface being aspheric. The fifth lens element with refractive power has both an object-side surface and an image-side surface being aspheric. The sixth lens element with refractive power has both an object-side surface and an image-side surface being aspheric. The imaging optical lens assembly has a total of six lens elements with refractive power. There is an air gap between any two of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element that are adjacent to each other. There is no relative movement among the lens elements with refractive power thereof. The imaging optical lens assembly further comprises an aperture stop with no lens element having refractive power between the aperture stop and the first lens element. When a focal length of the Imaging optical lens assembly is f, a maximum image height of the imaging optical lens assembly is ImgH, a sum of central thicknesses of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element is ΣCT, a sum of axial distances between every two of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element that are adjacent to each other is ΣAT, and an axial distance between the aperture stop and the image-side surface of the sixth lens element is SD, the following conditions are satisfied:
 
2.0&lt; f /Img H;  
 
0.90&lt;(Σ CT+ΣAT )/ SD&lt; 1.30; and
 
1.55&lt;(Σ CT+ΣAT )/Σ CT.  
 
     According to another aspect of the present disclosure, an imaging apparatus includes the imaging optical lens assembly according to the aforementioned aspect and an image sensor, wherein the image sensor is disposed on an image surface of the imaging optical lens assembly. 
     According to still another aspect of the present disclosure, an electronic device includes the imaging apparatus according to the foregoing aspect. 
     According to yet another aspect of the present disclosure, an imaging optical lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The first lens element with positive refractive power has a convex object-side surface. The second lens element has negative refractive power. The third lens element with refractive power has both an object-side surface and an image-side surface being aspheric. The fourth lens element with refractive power has both an object-side surface and an image-side surface being aspheric. The fifth lens element with refractive power has both an object-side surface and an image-side surface being aspheric. The sixth lens element with refractive power has both an object-side surface and an image-side surface being aspheric. The imaging optical lens assembly has a total of six lens elements with refractive power. There is an air gap between any two of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element that are adjacent to each other. There is no relative movement among the lens elements with refractive power thereof. The imaging optical lens assembly further comprises an aperture stop with no lens element having refractive power between the aperture stop and an object. When a focal length of the imaging optical lens assembly is f, a maximum image height of the imaging optical lens assembly is ImgH, a sum of central thicknesses of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element Is ΣCT, a sum of axial distances between every two of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element that are adjacent to each other is ΣAT, and an axial distance between the aperture stop and the image-side surface of the sixth lens element is SD, the following conditions are satisfied:
 
2.0&lt; f /Img H ; and
 
0.90&lt;(Σ CT+ΣAT )/ SD&lt; 1.20.
 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The disclosure can be more fully understood by reading the following detailed description of the embodiments, with reference made to the accompanying drawings as follows: 
         FIG.  1    is a schematic view of an imaging apparatus according to the 1st embodiment of the present disclosure; 
         FIG.  2    shows spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 1st embodiment; 
         FIG.  3    is a schematic view of an imaging apparatus according to the 2nd embodiment of the present disclosure; 
         FIG.  4    shows spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 2nd embodiment; 
         FIG.  5    is a schematic view of an imaging apparatus according to the 3rd embodiment of the present disclosure; 
         FIG.  6    shows spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 3rd embodiment; 
         FIG.  7    is a schematic view of an imaging apparatus according to the 4th embodiment of the present disclosure; 
         FIG.  8    shows spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 4th embodiment; 
         FIG.  9    is a schematic view of an imaging apparatus according to the 5th embodiment of the present disclosure; 
         FIG.  10    shows spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 5th embodiment; 
         FIG.  11    is a schematic view of an imaging apparatus according to the 6th embodiment of the present disclosure; 
         FIG.  12    shows spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 6th embodiment; 
         FIG.  13    is a schematic view of an imaging apparatus according to the 7th embodiment of the present disclosure; 
         FIG.  14    shows spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 7th embodiment; 
         FIG.  15    is a schematic view of an imaging apparatus according to the 8th embodiment of the present disclosure; 
         FIG.  16    shows spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 8th embodiment; 
         FIG.  17    is a schematic view of an imaging apparatus according to the 9th embodiment of the present disclosure; 
         FIG.  18    shows spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 9th embodiment; 
         FIG.  19    is a schematic view of an imaging apparatus according to the 10th embodiment of the present disclosure; 
         FIG.  20    shows spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 10th embodiment; 
         FIG.  21    shows a schematic view of the parameter SAG 62  of the Imaging optical lens assembly of the imaging apparatus according to  FIG.  1   ; 
         FIG.  22    shows an electronic device according to the 11th embodiment of the present disclosure; 
         FIG.  23    shows an electronic device according to the 12th embodiment of the present disclosure; and 
         FIG.  24    shows an electronic device according to the 13th embodiment of the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     An imaging optical lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The imaging optical lens assembly has a total of six lens elements with refractive power. 
     According to the imaging optical lens assembly of the present disclosure, there is an air gap between any two of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element that are adjacent to each other, that is, each of the first through sixth lens elements of the imaging optical lens assembly is a single and non-cemented lens element. Moreover, the manufacturing process of the cemented lenses is more complex than the non-cemented lenses. In particular, an image-side surface of one lens element and an object-side surface of the following lens element need to have accurate curvature to ensure these two lens elements will be highly cemented. However, during the cementing process, those two lens elements might not be highly cemented due to displacement and it is thereby not favorable for the image quality of the Imaging optical lens assembly. Therefore, there is an air gap between any two of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element that are adjacent to each other in the present disclosure for resolving the problem generated by the cemented lens elements. 
     There is no relative movement among the lens elements with refractive power of the imaging optical lens assembly. Therefore, it is favorable for reducing the misalignment with the optical axis of each lens element caused by the relative movement among the lens elements. 
     The first lens element with positive refractive power has a convex object-side surface and can have a concave image-side surface. Therefore, it is favorable for having the light gathering of the imaging optical lens assembly on the object side so as to reduce a back focal length, maintain the compact size and reduce the astigmatism. 
     The second lens element with negative refractive power can have a concave image-side surface. Therefore, it Is favorable for adjusting the light path of different bands so as to further focus the image point and correct the aberration of the imaging optical lens assembly. 
     The third lens element can have positive refractive power and have a concave image-side surface. Therefore, it is favorable for effectively reducing the sensitivity of refractive power distribution. 
     The fourth lens element can have positive refractive power, and can have a concave object-side surface and a convex image-side surface. Therefore, it is favorable for effectively correcting the astigmatism and reducing the sensitivity of refractive power distribution. 
     The fifth lens element can have negative refractive power and have a concave image-side surface. Therefore, it is favorable for effectively correcting the astigmatism. Furthermore, the fifth lens element can have an object-side surface changing from a convex shape to a concave shape from a paraxial region thereof to an off-axis region thereof. Therefore, it is favorable for effectively correcting the off-axis aberration. 
     The sixth lens element can have negative refractive power, and can have a concave object-side surface and a convex image-side surface. Therefore, the principal point of the imaging optical lens assembly can be positioned away from the image surface, and the back focal length can be reduced so as to maintain the compact size of the imaging optical lens assembly. 
     Furthermore, at least one surface of at least one of the fifth lens element and the sixth lens element has at least one inflection point. Therefore, it is favorable for effectively reducing the incident angle of off-axis so as to correct the off-axis aberration. 
     The imaging optical lens assembly further includes a stop, such as an aperture stop, and there is no lens element with refractive power between the stop and the first lens element. Thus, the stop can be disposed between the object and the first lens element, or between the first lens element and the second lens element. Therefore, it Is favorable for obtaining a longer distance between an exit pupil of the imaging optical lens assembly and the image surface so as to enhance the telecentric effect and improve the image-sensing efficiency of an image sensor. 
     When a focal length of the imaging optical lens assembly is f, and a maximum Image height of the imaging optical lens assembly is ImgH, the following condition is satisfied: 2.0&lt;f/ImgH. Therefore, it is favorable for enhancing the image capturing ability on a far specific region and obtaining the high resolution image while focusing on the far specific region. 
     When a sum of central thicknesses of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element is ΣCT, a sum of axial distances between every two of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element that are adjacent to each other is ΣAT, and an axial distance between the stop and the Image-side surface of the sixth lens element is SD, the following condition is satisfied: 0.90&lt;(ΣCT+ΣAT)/SD&lt;1.30. Therefore, it is favorable for balancing the telephoto image quality and the space arrangement. Preferably, the following condition is satisfied: 0.90&lt;(ΣCT+ΣAT)/SD&lt;1.20. 
     When the sum of central thicknesses of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element is ΣCT, and the sum of axial distances between every two of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element that are adjacent to each other is ΣAT, the following condition is satisfied: 1.55&lt;(ΣCT+ΣAT)/ΣCT. Therefore, it is favorable for assembling the lens elements and maintaining the compact size of the imaging optical lens assembly. 
     When an axial distance between the object-side surface of the first lens element and the image surface is TL, and the focal length of the imaging optical lens assembly is f, the following condition is satisfied: 0.50&lt;TL/f&lt;1.15. Therefore, it is favorable for maintaining the compact size of the imaging optical lens assembly. Preferably, the following condition is satisfied: 0.70&lt;TL/f&lt;1.05. More preferably, the following condition is satisfied: 0.70&lt;Tf&lt;1.0. 
     When an Abbe number of the fourth lens element is V4, the following condition is satisfied: V4&lt;30. Therefore, it is favorable for correcting the chromatic aberration of the imaging optical lens assembly. 
     When the focal length of the imaging optical lens assembly is f, and a curvature radius of the object-side surface of the first lens element is R 1 , the following condition is satisfied: 3.0&lt;f/R 1 . Therefore, it is favorable for strengthening refractive power of the object side of the imaging optical lens assembly so as to enhance the resolution and details of a distant image. 
     When an axial distance between the fifth lens element and the sixth lens element is T 56 , a central thickness of the first lens element is CT 1 , a central thickness of the second lens element is CT 2 , a central thickness of the third lens element is CT 3 , a central thickness of the fourth lens element is CT 4 , a central thickness of the fifth lens element is CT 5 , a central thickness of the sixth lens element is CT 6 , and a maximum value among CT 1 , CT 2 , CT 3 , CT 4 , CT 5  and CT 6  is CTmax, the following condition is satisfied: 0.70&lt;T 56 /CTmax. Therefore, it is favorable for properly adjusting the axial distance and central thicknesses of the lens elements so as to obtain sufficient space for adjusting light beams and correct the high-order aberration and image bending. 
     When a half of a maximal field of view of the imaging optical lens assembly is HFOV, the following condition is satisfied: 7.5 degrees&lt;HFOV&lt;23.5 degrees. Therefore, it is favorable for obtaining a proper field of view and an imaging scene. 
     When a distance in parallel with an optical axis from an axial vertex on the image-side surface of the sixth lens element to a maximum effective radius position on the image-side surface of the sixth lens element is SAG 62 , and the central thickness of the sixth lens element is CT 6 , the following condition is satisfied: SAG 62 +CT 6 &lt;0 mm. Therefore, it is favorable for effectively controlling the incident angle of off-axis onto the image surface so as to improve the photosensitivity of the image sensor and reduce the image vignetting. 
     When a refractive index of the first lens element is N 1 , a refractive index of the second lens element is N 2 , a refractive index of the third lens element is N 3 , a refractive index of the fourth lens element is N 4 , a refractive index of the fifth lens element Is N 5 , a refractive index of the sixth lens element is N 6 , and a maximum value among N 1 , N 2 , N 3 , N 4 , N 5  and N 6  is Nmax, the following condition is satisfied: Nmax&lt;1.70. Therefore, it is favorable for correcting the aberration. 
     When the axial distance between the object-side surface of the first lens element and the image surface is TL, and the maximum image height of the imaging optical lens assembly is ImgH, the following condition is satisfied: 2.0&lt;TL/ImgH&lt;3.0. Therefore, it is favorable for controlling the field of view and effectively reducing the total track length of the imaging optical lens assembly so as to maintain the compact size thereof. 
     When the central thickness of the sixth lens element is CT 6 , and an axial distance between the first lens element and the second lens element is T 12 , the following condition is satisfied: 2&lt;CT 6 /T 12 &lt;30. Therefore, it is favorable for manufacturing and assembling the lens elements so as to increase the manufacturing yield rate. 
     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 third lens element is V3, the Abbe number of the fourth lens element is V4, an Abbe number of the fifth lens element is V5, and an Abbe number of the sixth lens element is V6, at least two of V1, V2, V3, V4, V5 and V6 are smaller than 27. Therefore, it is favorable for correcting the chromatic aberration of the imaging optical lens assembly and maintaining the image quality. 
     When a composite focal length of the first lens element and the second lens element is f12, and a composite focal length of the third lens element, the fourth lens element, the fifth lens element and the sixth lens element is f3456, the following condition is satisfied: f12/f3456&lt;0.30. Therefore, it is favorable for properly distributing refractive power of the object side and image side of the imaging optical lens assembly so as to satisfy the requirements of the resolution of telephoto and the compact size thereof. 
     When a maximum effective radius of the object-side surface of the first lens element is Y 11 , and a maximum effective radius of the image-side surface of the sixth lens element is Y 62 , the following condition is satisfied: 0.50&lt;Y 11 /Y 62 &lt;0.80. Therefore, it is favorable for reducing the total track length of the imaging optical lens assembly and obtaining the efficient exposure so as to improve the image quality. 
     When the axial distance between the first lens element and the second lens element is T 12 , an axial distance between the second lens element and the third lens element is T 23 , an axial distance between the third lens element and the fourth lens element is T 34 , an axial distance between the fourth lens element and the fifth lens element is T 45 , and the axial distance between the fifth lens element and the sixth lens element is T 56 , the following conditions are satisfied: 0&lt;T 12 &lt;T 23 &lt;T 56 ; 0&lt;T 12 &lt;T 34 &lt;T 56 ; 0&lt;T 45 &lt;T 23 &lt;T 56 ; and 0&lt;T 45 &lt;T 34 &lt;T 56 . Therefore, it is favorable for arranging the lens elements so as to improve the manufacturing efficiency. 
     According to the Imaging optical lens assembly of the present disclosure, the lens elements thereof can be made of plastic or glass material. When the lens elements are made of plastic material, the manufacturing cost can be effectively reduced. When the lens elements are made of glass material, the arrangement of the refractive power of the imaging optical lens assembly may be more flexible to design. Furthermore, surfaces of each lens element can be arranged to be aspheric, since the aspheric surface of the lens element is easy to form a shape other than spherical surface so as to have more controllable variables for eliminating the aberration thereof, and to further decrease the required number of the lens elements. Therefore, the total track length of the imaging optical lens assembly can also be reduced. 
     According to the imaging optical lens assembly of the present disclosure, each of an object-side surface and an Image-side surface has a paraxial region and an off-axis region. The paraxial region refers to the region of the surface where light rays travel close to the optical axis, and the off-axis region refers to the region of the surface away from the paraxial region. Particularly, when the lens element has a convex surface, it indicates that the surface is convex in the paraxial region thereof; when the lens element has a concave surface, it indicates that the surface is concave in the paraxial region thereof. 
     Furthermore, when the lens element has positive refractive power or negative refractive power, it Indicates that the lens element has refractive power in the paraxial region thereof. When the lens element has a focal length, it indicates that the lens element has a focal length in the paraxial region thereof. 
     According to the imaging optical lens assembly of the present disclosure, the image surface, depending on the corresponding image sensor, can be a plane surface or a curved surface with any curvature. When the image surface is a curved surface, it is particularly indicates a concave surface toward the object side. 
     According to the imaging optical lens assembly of the present disclosure, an aperture 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 optical lens assembly and the image surface and thereby Improves the image-sensing efficiency of an image 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 optical lens assembly and thereby provides a widerfield of view for the same. 
     According to the imaging optical lens assembly of the present disclosure, the imaging optical lens assembly can include at least one stop, such as an aperture stop, a glare stop or a field stop. The glare stop or the field stop is for eliminating the stray light and thereby improving the image resolution thereof. 
     According to the imaging optical lens assembly of the present disclosure, the imaging optical lens assembly is featured with good correction ability and high image quality, and can be applied to 3D (three-dimensional) image capturing applications, in products such as digital cameras, mobile devices, digital tablets, smart TVs, network monitoring devices, motion sensing input devices, driving recorders, rear view camera systems, wearable devices and other electronic imaging products. 
     According to the present disclosure, an imaging apparatus is provided. The imaging apparatus includes the aforementioned imaging optical lens assembly according to the present disclosure and an image sensor, wherein the image sensor is disposed on or near an image surface of the aforementioned imaging optical lens assembly. In the imaging optical lens assembly of the imaging apparatus, it is favorable for properly adjusting the distribution of refractive power of the first lens element and the second lens element so as to prevent having excessively large size of the imaging optical lens assembly and provide a better focus of the telephoto image. Moreover, it is favorable for arranging the stop and the first lens element so as to increase the distance between an exit pupil of the imaging optical lens assembly and the image surface, thereby enhancing the telecentric effect and the image-sensing efficiency of the image sensor. Preferably, the imaging apparatus can further include a barrel member, a holder member or a combination thereof. 
     According to the present disclosure, an electronic device is provided, wherein the electronic device includes the aforementioned imaging apparatus. Therefore, it is favorable for telephoto shooting, arrangement of the lens elements and designs of the surface shapes so as to satisfy the requirements of resolution of telephoto and the compact size thereof. Preferably, the electronic device can further include but not limited to a control unit, a display, a storage unit, a random access memory unit (RAM) or a combination thereof. 
     According to the above description of the present disclosure, the following 1st-13th specific embodiments are provided for further explanation. 
     1st Embodiment 
       FIG.  1    is a schematic view of an imaging apparatus according to the 1st embodiment of the present disclosure.  FIG.  2    shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the Imaging apparatus according to the 1st embodiment. 
     In  FIG.  1   , the imaging apparatus includes the imaging optical lens assembly (its reference numeral is omitted) and an image sensor  190 . The imaging optical lens assembly includes, in order from an object side to an image side, an aperture stop  100 , a first lens element  110 , a second lens element  120 , a third lens element  130 , a fourth lens element  140 , a fifth lens element  150 , a sixth lens element  160 , an IR-cut filter  170  and an image surface  180 . The image sensor  190  is disposed on the image surface  180  of the imaging optical lens assembly. The imaging optical lens assembly has a total of six lens elements ( 110 - 160 ) with refractive power. Moreover, there is an air gap between any two of the first lens element  110 , the second lens element  120 , the third lens element  130 , the fourth lens element  140 , the fifth lens element  150 , and the sixth lens element  160  that are adjacent to each other and there is no relative movement among the lens elements ( 110 - 160 ) with refractive power. 
     The first lens element  110  with positive refractive power has a convex object-side surface  111  and a concave image-side surface  112 . The first lens element  110  is made of plastic material and has both the object-side surface  111  and the image-side surface  112  being aspheric. 
     The second lens element  120  with negative refractive power has a convex object-side surface  121  and a concave image-side surface  122 . The second lens element  120  is made of plastic material and has both the object-side surface  121  and the image-side surface  122  being aspheric. 
     The third lens element  130  with positive refractive power has a convex object-side surface  131  and a concave image-side surface  132 . The third lens element  130  is made of plastic material and has both the object-side surface  131  and the image-side surface  132  being aspheric. 
     The fourth lens element  140  with positive refractive power has a concave object-side surface  141  and a convex image-side surface  142 . The fourth lens element  140  is made of plastic material and has both the object-side surface  141  and the image-side surface  142  being aspheric. 
     The fifth lens element  150  with negative refractive power has a convex object-side surface  151  and a concave image-side surface  152 . The fifth lens element  150  is made of plastic material and has both the object-side surface  151  and the image-side surface  152  being aspheric. Furthermore, the object-side surface  151  of the fifth lens element  150  has at least one inflection point. The object-side surface  151  of the fifth lens element  150  changes from a convex shape to a concave shape from a paraxial region thereof to an off-axis region thereof. 
     The sixth lens element  160  with negative refractive power has a concave object-side surface  161  and a convex image-side surface  162 . The sixth lens element  160  is made of plastic material and has both the object-side surface  161  and the image-side surface  162  being aspheric. Furthermore, the object-side surface  161  of the sixth lens element  160  has at least one inflection point. 
     The IR-cut filter  170  is made of glass material and located between the sixth lens element  160  and the image surface  180 , and will not affect the focal length of the imaging optical lens assembly. 
     The equation of the aspheric surface profiles of the aforementioned lens elements of the 1st embodiment is expressed as follows: 
                 X   ⁡     (   Y   )       =         (       Y   2     ⁢     /     ⁢   R     )     ⁢     /     ⁢     (     1   +     s   ⁢   q   ⁢   r   ⁢     t   ⁡     (     1   -       (     1   +   k     )     ×       (     Y   ⁢     /     ⁢   R     )     2         )           )       +       ∑   i     ⁢       (     A   ⁢   i     )     ×     (     Y   i     )             ,         
where,
 
     X is the relative distance between a point on the aspheric surface spaced at a distance Y from the optical axis and the tangential plane at the aspheric surface vertex on the optical axis; 
     Y is the vertical distance from the point on the aspheric surface to the optical axis; 
     R is the curvature radius; 
     k is the conic coefficient; and 
     Ai is the i-th aspheric coefficient. 
     in the imaging optical lens assembly of the imaging apparatus according to the 1st embodiment, when a focal length of the imaging optical lens assembly is f, an f-number of the imaging optical lens assembly is Fno, and half of a maximal field of view of the imaging optical lens assembly is HFOV, these parameters have the following values: f=5.96 mm; Fno  2 . 60 ; and HFOV=20.0 degrees. 
     In the imaging optical lens assembly of the imaging apparatus according to the 1st embodiment, when an Abbe number of the fourth lens element  140  is V4, the following condition is satisfied: V4=23.3. 
     In the imaging optical lens assembly of the imaging apparatus according to the 1st embodiment, when a refractive index of the first lens element  110  is N 1 , a refractive index of the second lens element  120  is N 2 , a refractive index of the third lens element  130  is N 3 , a refractive index of the fourth lens element  140  is N 4 , a refractive index of the fifth lens element  150  is N 5 , a refractive index of the sixth lens element  160  is N 6 , and a maximum value among N 1 , N 2 , N 3 , N 4 , N 6  and N 6  is Nmax, the following condition is satisfied: Nmax  1 . 640 . 
     In the imaging optical lens assembly of the imaging apparatus according to the 1st embodiment, when a central thickness of the sixth lens element  160  is CT 6 , and an axial distance between the first lens element  110  and the second lens element  120  is T 12 , the following condition is satisfied: CT 6 /T 12 =14.10. 
     In the imaging optical lens assembly of the imaging apparatus according to the 1st embodiment, when an axial distance between the fifth lens element  150  and the sixth lens element  160  is T 56 , a central thickness of the first lens element  110  is CT 1 , a central thickness of the second lens element  120  is CT 2 , a central thickness of the third lens element  130  is CT 3 , a central thickness of the fourth lens element  140  is CT 4 , a central thickness of the fifth lens element  150  is CT 5 , the central thickness of the sixth lens element  160  is CT 6 , and a maximum value among CT 1 , CT 2 , CT 3 , CT 4 , CT 5  and CT 6  is CTmax, the following condition is satisfied: T 56 /CTmax=2.03. 
     In the imaging optical lens assembly of the imaging apparatus according to the 1st embodiment, when the focal length of the imaging optical lens assembly is f, and a curvature radius of the object-side surface  111  of the first lens element  110  is R 1 , the following condition is satisfied: f/R1=4.05. 
     In the imaging optical lens assembly of the imaging apparatus according to the 1st embodiment, when the focal length of the imaging optical lens assembly is f, and a maximum image height of the imaging optical lens assembly is ImgH (half of a diagonal length of an effective photosensitive area of the image sensor  190 ), the following conditions is satisfied: f/ImgH=2.67. 
     In the imaging optical lens assembly of the imaging apparatus according to the 1st embodiment, when a composite focal length of the first lens element  110  and the second lens element  120  is f12, and a composite focal length of the third lens element  130 , the fourth lens element  140 , the fifth lens element  150  and the sixth lens element  160  is f3456, the following condition is satisfied: f12/f3456=−0.41. 
     In the imaging optical lens assembly of the imaging apparatus according to the 1st embodiment, when a maximum effective radius of the object-side surface  111  of the first lens element  110  is Y 11 , and a maximum effective radius of the image-side surface  162  of the sixth lens element  160  is Y 62 , the following condition is satisfied: Y 11 /Y 62 =0.66. 
       FIG.  21    shows a schematic view of the parameter SAG 62  of the imaging optical lens assembly of the imaging apparatus according to  FIG.  1   . In  FIG.  21   , when a distance in parallel with the optical axis from an axial vertex on the image-side surface  162  of the sixth lens element  160  to a maximum effective radius position on the image-side surface  162  of the sixth lens element  160  is SAG 62  (SAG 62  is a negative value with the distance in parallel with the optical axis towards the object side; SAG 62  is a positive value with the distance in parallel with the optical axis towards the image side.), and the central thickness of the sixth lens element  160  is CT 6 , the following condition is satisfied: SAG 62 +CT 6 =−0.34 mm. 
     In the imaging optical lens assembly of the imaging apparatus according to the 1st embodiment, when a sum of central thicknesses of the first lens element  110 , the second lens element  120 , the third lens element  130 , the fourth lens element  140 , the fifth lens element  150  and the sixth lens element  160  is ΣCT, a sum of axial distances between every two of the first lens element  110 , the second lens element  120 , the third lens element  130 , the fourth lens element  140 , the fifth lens element  150  and the sixth lens element  160  that are adjacent to each other is ΣAT, and an axial distance between the aperture stop  100  and the image-side surface  162  of the sixth lens element  160  is SD, the following conditions is satisfied: (ΣCT+ΣAT)/SD=1.13. 
     In the imaging optical lens assembly of the imaging apparatus according to the 1st embodiment, when the sum of central thicknesses of the first lens element  110 , the second lens element  120 , the third lens element  130 , the fourth lens element  140 , the fifth lens element  150  and the sixth lens element  160  is ΣCT, and the sum of axial distances between every two of the first lens element  110 , the second lens element  120 , the third lens element  130 , the fourth lens element  140 , the fifth lens element  150  and the sixth lens element  160  that are adjacent to each other is ΣAT, the following conditions is satisfied: (ΣCT+ΣAT)/ΣCT=1.92. 
     In the imaging optical lens assembly of the imaging apparatus according to the 1st embodiment, when an axial distance between the object-side surface  111  of the first lens element  110  and the image surface  180  is TL, and the focal length of the imaging optical lens assembly is f, the following condition is satisfied: TL/f=0.89. 
     in the imaging optical lens assembly of the imaging apparatus according to the 1st embodiment, when the axial distance between the object-side surface  111  of the first lens element  110  and the image surface  180  is TL, and the maximum image height of the Imaging optical lens assembly Is ImgH, the following condition is satisfied: TL/ImgH=2.39. 
     In the imaging optical lens assembly of the imaging apparatus according to the 1st embodiment, when 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 third lens element  130  is V3, the Abbe number of the fourth lens element  140  is V4, an Abbe number of the fifth lens element  150  is V5, and an Abbe number of the sixth lens element  160  is V6, two (V2=23.3 and V4=23.3) of V1, V2, V3, V4, V5 and V6 are smaller than 27. 
     In the imaging optical lens assembly of the imaging apparatus according to the 1st embodiment, when the axial distance between the first lens element  110  and the second lens element  120  is T 12 , an axial distance between the second lens element  120  and the third lens element  130  is T 23 , an axial distance between the third lens element  130  and the fourth lens element  140  is T 34 , an axial distance between the fourth lens element  140  and the fifth lens element  150  is T 45 , and the axial distance between the fifth lens element  150  and the sixth lens element  160  is T 56 , the following conditions are satisfied: 0&lt;ST 12 &lt;T 23 &lt;T 56 ; 0&lt;T 12 &lt;T 34 &lt;T 56 ; 0&lt;T 45 &lt;T 23 &lt;T 56 ; and 0&lt;T 45 &lt;T 34 &lt;T 56 . 
     The detailed optical data of the 1st embodiment are shown in TABLE 1 and the aspheric surface data are shown in TABLE 2 below. 
     
       
         
           
               
             
               
                 TABLE 1 
               
             
            
               
                   
               
               
                 1st Embodiment 
               
               
                 f = 5.96 mm, Fno = 2.60, HFOV = 20.0 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Focal length 
               
               
                   
               
               
                  0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                  1 
                 Ape. Stop 
                 Plano 
                 −0.520 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                  2 
                 Lens 1 
                 1.470 
                 ASP 
                 0.724 
                 Plastic 
                 1.544 
                 55.9 
                 3.06 
               
               
                  3 
                   
                 10.314 
                 ASP 
                 0.040 
                   
                   
                   
                   
               
               
                  4 
                 Lens 2 
                 13.861 
                 ASP 
                 0.230 
                 Plastic 
                 1.640 
                 23.3 
                 −4.18 
               
               
                  5 
                   
                 2.225 
                 ASP 
                 0.213 
                   
                   
                   
                   
               
               
                  6 
                 Lens 3 
                 2.184 
                 ASP 
                 0.367 
                 Plastic 
                 1.544 
                 55.9 
                 8.71 
               
               
                  7 
                   
                 3.808 
                 ASP 
                 0.416 
                   
                   
                   
                   
               
               
                  8 
                 Lens 4 
                 −5.078 
                 ASP 
                 0.282 
                 Plastic 
                 1.640 
                 23.3 
                 9.04 
               
               
                  9 
                   
                 −2.763 
                 ASP 
                 0.082 
                   
                   
                   
                   
               
               
                 10 
                 Lens 5 
                 2.661 
                 ASP 
                 0.250 
                 Plastic 
                 1.544 
                 55.9 
                 −4.39 
               
               
                 11 
                   
                 1.218 
                 ASP 
                 1.469 
                   
                   
                   
                   
               
               
                 12 
                 Lens 6 
                 −2.550 
                 ASP 
                 0.564 
                 Plastic 
                 1.544 
                 55.9 
                 −9.39 
               
               
                 13 
                   
                 −5.490 
                 ASP 
                 0.200 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 14 
                 IR-cut filter 
                 Plano 
                 0.248 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 15 
                   
                 Plano 
                 0.247 
                   
                   
                   
                   
               
               
                 16 
                 Image 
                 Plano 
                 — 
                   
                   
                   
                   
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 2 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
            
               
                 Surface # 
                 2 
                 3 
                 4 
                 5 
               
               
                   
               
               
                 k = 
                   1.9460E−01 
                   5.0000E+01 
                 −1.6068E+01 
                 −1.3294E+01 
               
               
                 A4 = 
                 −7.1745E−03 
                 −8.4996E−02 
                 −1.7160E−01 
                 −5.6189E−02 
               
               
                 A6 = 
                 −1.3657E−02 
                   1.3690E−01 
                   3.6558E−01 
                   2.4124E−01 
               
               
                 A8 = 
                   4.2785E−02 
                 −4.7390E−02 
                 −2.9545E−01 
                 −1.9055E−01 
               
               
                 A10 = 
                 −8.9690E−02 
                 −1.5905E−01 
                 −3.5146E−03 
                   5.9696E−02 
               
               
                 A12 = 
                   7.9306E−02 
                   1.9358E−01 
                   1.6061E−01 
                   3.7867E−02 
               
               
                 A14 = 
                 −2.9319E−02 
                 −6.5167E−02 
                 −6.4322E−02 
                   3.3392E−02 
               
               
                   
               
               
                 Surface # 
                 6 
                 7 
                 8 
                 9 
               
               
                   
               
               
                 k = 
                 −9.1291E+00 
                 −1.8655E+00 
                   1.2565E+01 
                   1.3525E+00 
               
               
                 A4 = 
                 −8.5960E−02 
                 −6.9795E−02 
                   1.4312E−01 
                   1.2711E−01 
               
               
                 A6 = 
                   6.8717E−03 
                 −7.8050E−02 
                 −4.1327E−01 
                 −2.5818E−01 
               
               
                 A8 = 
                 −9.9892E−03 
                   4.9883E−02 
                   4.0174E−01 
                   1.0637E−01 
               
               
                 A10 = 
                   6.7751E−02 
                   6.0343E−03 
                 −4.5780E−01 
                 −8.4257E−02 
               
               
                 A12 = 
                 −3.6768E−02 
                 −2.8121E−02 
                   1.0455E−01 
                   2.5202E−02 
               
               
                 A14 = 
                   3.3756E−02 
                   6.8361E−03 
                   4.1473E−02 
                   1.9252E−02 
               
               
                   
               
               
                 Surface # 
                 10 
                 11 
                 12 
                 13 
               
               
                   
               
               
                 k = 
                 −5.0000E+01 
                 −8.6049E+00 
                 −1.0000E+00 
                   3.1952E+00 
               
               
                 A4 = 
                 −2.5156E−01 
                 −5.9708E−02 
                 −8.3429E−02 
                 −1.4058E−01 
               
               
                 A6 = 
                   1.1497E−01 
                   6.3295E−02 
                   2.6635E−02 
                   4.6297E−02 
               
               
                 A8 = 
                 −5.8806E−02 
                   2.6270E−02 
                 −8.8252E−04 
                 −7.5781E−03 
               
               
                 A10 = 
                   1.4106E−02 
                 −3.5400E−02 
                   6.0690E−04 
                 −1.3933E−04 
               
               
                 A12 = 
                   2.0375E−02 
                   1.0639E−03 
                   1.0922E−04 
                   1.0766E−04 
               
               
                 A14 = 
                 −2.2911E−02 
                   4.0078E−03 
                 −8.3472E−05 
                 −3.3106E−07 
               
               
                   
               
            
           
         
       
     
     In TABLE 1, the curvature radius, the thickness and the focal length are shown in millimeters (mm). Surface numbers 0-16 represent the surfaces sequentially arranged from the object-side to the image-side along the optical axis. In TABLE 2, k represents the conic coefficient of the equation of the aspheric surface profiles. A4-A14 represent the aspheric coefficients ranging from the 4th order to the 14th order. The tables presented below for each embodiment are the corresponding schematic parameter and aberration curves, and the definitions of the tables are the same as TABLE 1 and TABLE 2 of the 1st embodiment. Therefore, an explanation in this regard will not be provided again. 
     2nd Embodiment 
       FIG.  3    is a schematic view of an imaging apparatus according to the 2nd embodiment of the present disclosure.  FIG.  4    shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 2nd embodiment. 
     In  FIG.  3   , the Imaging apparatus includes the imaging optical lens assembly (its reference numeral is omitted) and an image sensor  290 . The imaging optical lens assembly includes, in order from an object side to an image side, an aperture stop  200 , a first lens element  210 , a second lens element  220 , a third lens element  230 , a fourth lens element  240 , a fifth lens element  250 , a sixth lens element  260 , an JR-cut filter  270  and an image surface  280 . The image sensor  290  is disposed on the image surface  280  of the imaging optical lens assembly. The imaging optical lens assembly has a total of six lens elements ( 210 - 260 ) with refractive power. Moreover, there is an air gap between any two of the first lens element  210 , the second lens element  220 , the third lens element  230 , the fourth lens element  240 , the fifth lens element  250 , and the sixth lens element  260  that are adjacent to each other and there is no relative movement among the lens elements ( 210 - 260 ) with refractive power. 
     The first lens element  210  with positive refractive power has a convex object-side surface  211  and a concave image-side surface  212 . The first lens element  210  is made of plastic material and has both the object-side surface  211  and the image-side surface  212  being aspheric. 
     The second lens element  220  with negative refractive power has a convex object-side surface  221  and a concave image-side surface  222 . The second lens element  220  is made of plastic material and has both the object-side surface  221  and the image-side surface  222  being aspheric. 
     The third lens element  230  with positive refractive power has a convex object-side surface  231  and a concave image-side surface  232 . The third lens element  230  is made of plastic material and has both the object-side surface  231  and the image-side surface  232  being aspheric. 
     The fourth lens element  240  with positive refractive power has a concave object-side surface  241  and a convex image-side surface  242 . The fourth lens element  240  is made of plastic material and has both the object-side surface  241  and the image-side surface  242  being aspheric. 
     The fifth lens element  250  with negative refractive power has a convex object-side surface  251  and a concave image-side surface  252 . The fifth lens element  250  is made of plastic material and has both the object-side surface  251  and the image-side surface  252  being aspheric. Furthermore, the object-side surface  251  of the fifth lens element  250  has at least one inflection point. The object-side surface  251  of the fifth lens element  250  changes from a convex shape to a concave shape from a paraxial region thereof to an off-axis region thereof. 
     The sixth lens element  260  with negative refractive power has a concave object-side surface  261  and a convex image-side surface  262 . The sixth lens element  260  is made of plastic material and has both the object-side surface  261  and the image-side surface  262  being aspheric. Furthermore, the object-side surface  261  of the sixth lens element  260  has at least one inflection point. 
     The IR-cut filter  270  is made of glass material and located between the sixth lens element  260  and the image surface  280 , and will not affect the focal length of the imaging optical lens assembly. 
     Furthermore, in the imaging optical lens assembly of the imaging apparatus according to the 2nd embodiment, when an Abbe number of the first lens element  210  is V1, an Abbe number of the second lens element  220  is V2, an Abbe number of the third lens element  230  is V3, an Abbe number of the fourth lens element  240  is V4, an Abbe number of the fifth lens element  250  is V5, and an Abbe number of the sixth lens element  260  is V6, two (V2=23.3 and V4=23.3) of V1, V2, V3, V4, V5 and V6 are smaller than 27. 
     The detailed optical data of the 2nd embodiment are shown in TABLE 3 and the aspheric surface data are shown in TABLE 4 below. 
     
       
         
           
               
             
               
                 TABLE 3 
               
             
            
               
                   
               
               
                 2nd Embodiment 
               
               
                 f = 6.07 mm, Fno = 2.40, HFOV = 22.0 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Focal length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                  0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                  1 
                 Ape. Stop 
                 Plano 
                 −0.469 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                  2 
                 Lens 1 
                 1.856 
                 ASP 
                 0.694 
                 Plastic 
                 1.544 
                 55.9 
                 3.99 
               
               
                  3 
                   
                 11.180 
                 ASP 
                 0.077 
                   
                   
                   
                   
               
               
                  4 
                 Lens 2 
                 18.112 
                 ASP 
                 0.230 
                 Plastic 
                 1.640 
                 23.3 
                 −6.58 
               
               
                  5 
                   
                 3.398 
                 ASP 
                 0.368 
                   
                   
                   
                   
               
               
                  6 
                 Lens 3 
                 4.073 
                 ASP 
                 0.592 
                 Plastic 
                 1.544 
                 55.9 
                 11.43 
               
               
                  7 
                   
                 11.198 
                 ASP 
                 0.901 
                   
                   
                   
                   
               
               
                  8 
                 Lens 4 
                 −2.540 
                 ASP 
                 0.338 
                 Plastic 
                 1.640 
                 23.3 
                 58.81 
               
               
                  9 
                   
                 −2.503 
                 ASP 
                 0.030 
                   
                   
                   
                   
               
               
                 10 
                 Lens 5 
                 2.595 
                 ASP 
                 0.435 
                 Plastic 
                 1.544 
                 55.9 
                 −33.25 
               
               
                 11 
                   
                 2.136 
                 ASP 
                 0.706 
                   
                   
                   
                   
               
               
                 12 
                 Lens 6 
                 −3.863 
                 ASP 
                 0.431 
                 Plastic 
                 1.544 
                 55.9 
                 −8.71 
               
               
                 13 
                   
                 −21.734 
                 ASP 
                 0.475 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 14 
                 IR-cut filter 
                 Plano 
                 0.285 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 15 
                   
                 Plano 
                 0.609 
                   
                   
                   
                   
               
               
                 16 
                 Image 
                 Plano 
                 — 
                   
                   
                   
                   
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 4 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 Surface # 
                 2 
                 3 
                 4 
                 5 
                 6 
                 7 
               
               
                   
               
               
                 k= 
                   1.7378E−01 
                 −1.0000E+00  
                   5.0000E+01 
                 −1.7648E+01 
                 −1.0073E+00  
                 −3.5173E+00 
               
               
                 A4= 
                 −2.2843E−03 
                 −5.1227E−02  
                 −1.1750E−01  
                 −4.9402E−02 
                 −8.0771E−02 
                 −4.3747E−02 
               
               
                 A6= 
                 −5.4466E−03  
                   6.7566E−02 
                   1.8145E−01 
                   1.1190E−01 
                 −2.1948E−03  
                 −2.8477E−02 
               
               
                 A8= 
                   1.6515E−02 
                 −1.8551E−02  
                 −1.1029E−01  
                 −6.9735E−02 
                 −3.9664E−03 
                   1.0613E−02 
               
               
                 A10= 
                 −2.5082E−02 
                 −4.5702E−02  
                 −3.2424E−04 
                   2.0478E−02 
                   1.5094E−02 
                   1.4782E−03 
               
               
                 A12= 
                   1.6995E−02 
                   4.1245E−02 
                   3.4657E−02 
                   7.3267E−03 
                 −1.2059E−02  
                 −2.8401E−03 
               
               
                 A14= 
                 −5.0445E−03 
                 −1.0730E−02  
                 −1.0908E−02 
                 −1.4475E−04 
                   5.7860E−03 
                   1.1588E−03 
               
               
                   
               
               
                 Surface # 
                 8 
                 9 
                 10 
                 11 
                 12 
                 13 
               
               
                   
               
               
                 k= 
                 −1.2659E+00 
                   1.8214E−01 
                 −1.2613E+01  
                 −9.4963E+00  
                 −8.5912E+00 
                 −1.2603E+01 
               
               
                 A4= 
                   1.5739E−01 
                   8.3586E−02 
                 −1.4953E−01  
                 −5.3190E−02 
                 −3.4194E−02 
                 −3.7245E−02 
               
               
                 A6= 
                 −2.2709E−01 
                 −8.8761E−02  
                   4.0819E−02 
                   6.1885E−03 
                   1.0457E−02 
                   5.8712E−03 
               
               
                 A8= 
                   1.6973E−01 
                   4.8741E−02 
                 −1.6126E−02 
                   1.1721E−02 
                 −7.3614E−04 
                 −1.3906E−03 
               
               
                 A10= 
                 −1.0303E−01 
                 −2.4788E−02  
                   5.1557E−03 
                 −5.6278E−03 
                   8.7954E−05  
                   5.6291E−05 
               
               
                 A12= 
                   2.9620E−02 
                   6.0066E−03 
                 −8.0000E−04  
                   9.2690E−04 
                   1.5610E−05 
                 −1.9796E−06 
               
               
                 A14= 
                 −2.0459E−03 
                 −5.2468E−05 
                 −4.9155E−04 
                 −3.6645E−05  
                 −2.3279E−06  
                 −1.0960E−07 
               
               
                   
               
            
           
         
       
     
     In the 2nd embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 2nd embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from TABLE 3 and TABLE 4 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 2nd Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f (mm) 
                 6.07 
                 f/ImgH 
                 2.43 
               
               
                 Fno 
                 2.40 
                 f12/f3456 
                 −0.08 
               
               
                 HFOV (deg.) 
                 22.0 
                 Y11/Y62 
                 0.67 
               
               
                 V4 
                 23.3 
                 SAG62 + CT6 (mm) 
                 −0.08 
               
               
                 Nmax 
                 1.640 
                 (ΣCT + ΣAT)/SD 
                 1.11 
               
               
                 CT6/T12 
                 5.60 
                 (ΣCT + ΣAT)/ΣCT 
                 1.77 
               
               
                 T56/CTmax 
                 1.02 
                 TL/f 
                 1.02 
               
               
                 f/R1 
                 3.27 
                 TL/ImgH 
                 2.47 
               
               
                   
               
            
           
         
       
     
     3rd Embodiment 
       FIG.  5    is a schematic view of an imaging apparatus according to the 3rd embodiment of the present disclosure.  FIG.  6    shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 3rd embodiment. 
     In  FIG.  5   , the Imaging apparatus includes the imaging optical lens assembly (its reference numeral is omitted) and an image sensor  390 . The imaging optical lens assembly includes, in order from an object side to an image side, an aperture stop  300 , a first lens element  310 , a second lens element  320 , a third lens element  330 , a fourth lens element  340 , a fifth lens element  350 , a sixth lens element  360 , an IR-cut filter  370  and an image surface  380 . The image sensor  390  is disposed on the image surface  380  of the imaging optical lens assembly. The imaging optical lens assembly has a total of six lens elements ( 310 - 360 ) with refractive power. Moreover, there is an air gap between any two of the first lens element  310 , the second lens element  320 , the third lens element  330 , the fourth lens element  340 , the fifth lens element  350 , and the sixth lens element  360  that are adjacent to each other and there is no relative movement among the lens elements ( 310 - 360 ) with refractive power. 
     The first lens element  310  with positive refractive power has a convex object-side surface  311  and a concave image-side surface  312 . The first lens element  310  is made of plastic material and has both the object-side surface  311  and the image-side surface  312  being aspheric. 
     The second lens element  320  with negative refractive power has a convex object-side surface  321  and a concave Image-side surface  322 . The second lens element  320  is made of plastic material and has both the object-side surface  321  and the image-side surface  322  being aspheric. 
     The third lens element  330  with positive refractive power has a convex object-side surface  331  and a concave image-side surface  332 . The third lens element  330  is made of plastic material and has both the object-side surface  331  and the image-side surface  332  being aspheric. 
     The fourth lens element  340  with positive refractive power has a convex object-side surface  341  and a convex image-side surface  342 . The fourth lens element  340  is made of plastic material and has both the object-side surface  341  and the image-side surface  342  being aspheric. 
     The fifth lens element  350  with negative refractive power has a convex object-side surface  351  and a concave image-side surface  352 . The fifth lens element  350  is made of plastic material and has both the object-side surface  361  and the image-side surface  352  being aspheric. Furthermore, both of the object-side surface  351  and the image-side surface  352  of the fifth lens element  350  have at least one inflection point. The object-side surface  351  of the fifth lens element  350  changes from a convex shape to a concave shape from a paraxial region thereof to an off-axis region thereof. 
     The sixth lens element  360  with negative refractive power has a concave object-side surface  361  and a concave image-side surface  362 . The sixth lens element  360  is made of plastic material and has both the object-side surface  361  and the image-side surface  362  being aspheric. Furthermore, the image-side surface  362  of the sixth lens element  360  has at least one inflection point. 
     The IR-cut filter  370  is made of glass material and located between the sixth lens element  360  and the image surface  380 , and will not affect the focal length of the imaging optical lens assembly. 
     Furthermore, in the imaging optical lens assembly of the imaging apparatus according to the 3rd embodiment, when an Abbe number of the first lens element  310  is V1, an Abbe number of the second lens element  320  is V2, an Abbe number of the third lens element  330  is V3, an Abbe number of the fourth lens element  340  is V4, an Abbe number of the fifth lens element  350  is V5, and an Abbe number of the sixth lens element  360  is V6, two (V2=23.3 and V4=23.3) of V1, V2, V3, V4, V5 and V6 are smaller than 27. 
     In the imaging optical lens assembly of the imaging apparatus according to the 3rd embodiment, when an axial distance between the first lens element  310  and the second lens element  320  is T 12 , an axial distance between the second lens element  320  and the third lens element  330  is T 23 , an axial distance between the third lens element  330  and the fourth lens element  340  is T 34 , an axial distance between the fourth lens element  340  and a fifth lens element  350  is T 45 , and the axial distance between the fifth lens element  350  and the sixth lens element  360  is T 56 , the following conditions are satisfied: 0&lt;T 12 &lt;T 23 &lt;T 56 ; 0&lt;T 12 &lt;T 34 &lt;T 66 ; 0&lt;T 45 &lt;T 23 &lt;T 56 ; and 0&lt;T 45 &lt;T 34 &lt;T 56 . 
     The detailed optical data of the 3rd embodiment are shown in TABLE 5 and the aspheric surface data are shown in TABLE 6 below. 
     
       
         
           
               
             
               
                 TABLE 5 
               
             
            
               
                   
               
               
                 3rd Embodiment 
               
               
                 f = 6.07 mm, Fno = 2.40, HFOV = 22.0 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 Surface  
                   
                   
                   
                   
                   
                   
                 Abbe 
                 Focal 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 # 
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 Ape. Stop 
                 Plano 
                 −0.481 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 2 
                 Lens 1 
                 1.861 
                 ASP 
                 0.704 
                 Plastic 
                 1.544 
                 55.9 
                 4.13 
               
               
                 3 
                   
                 9.374 
                 ASP 
                 0.062 
                   
                   
                   
                   
               
               
                 4 
                 Lens 2 
                 9.904 
                 ASP 
                 0.230 
                 Plastic 
                 1.640 
                 23.3 
                 −6.10 
               
               
                 5 
                   
                 2.773 
                 ASP 
                 0.405 
                   
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 2.924 
                 ASP 
                 0.606 
                 Plastic 
                 1.544 
                 56.9 
                 17.68 
               
               
                 7 
                   
                 3.893 
                 ASP 
                 0.690 
                   
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 662.205 
                 ASP 
                 0.256 
                 Plastic 
                 1.640 
                 23.3 
                 68.06 
               
               
                 9 
                   
                 −39.348 
                 ASP 
                 0.110 
                   
                   
                   
                   
               
               
                 10 
                 Lens 6 
                 1.535 
                 ASP 
                 0.342 
                 Plastic 
                 1.644 
                 66.9 
                 −117.41 
               
               
                 11 
                   
                 1.381 
                 ASP 
                 1.376 
                   
                   
                   
                   
               
               
                 12 
                 Lens 6 
                 −10.997 
                 ASP 
                 0.449 
                 Plastic 
                 1.544 
                 55.9 
                 −11.68 
               
               
                 13 
                   
                 15.281 
                 ASP 
                 0.300 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 14 
                 IR-cut filter 
                 Plano 
                 0.285 
                 Glass 
                 1.617 
                 64.2 
                 — 
               
               
                 15 
                   
                 Plano 
                 0.356 
                   
                   
                   
                   
               
               
                 16  
                 Image 
                 Plano 
                 — 
                   
                   
                   
                   
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 6 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 Surface # 
                 2 
                 3 
                 4 
                 5 
                 6 
                 7 
               
               
                   
               
               
                 k= 
                   2.2333E−01 
                 −1.0000E+00 
                   4.9704E+01 
                 −1.1690E+01 
                 −2.9767E−02 
                 −5.3252E+00 
               
               
                 A4= 
                 −4.4841E−04 
                 −4.0080E−02 
                 −1.1481E−01 
                 −3.2068E−02 
                 −7.6879E−02 
                   4.3387E−02 
               
               
                 A6= 
                 −7.8204E−03 
                   7.0544E−02 
                   1.8160E−01 
                   1.1619E−01 
                   1.2464E−02 
                 −2.2171E−02 
               
               
                 A8= 
                   1.9163E−02 
                 −2.0424E−02  
                 −1.1074E−01 
                 −7.0774E−02 
                 −4.2649E−03 
                   1.6203E−02 
               
               
                 A10= 
                 −2.5934E−02 
                 −4.6911E−02 
                 −2.2582E−03 
                   2.0078E−02 
                   1.1291E−02  
                 −4.9124E−04 
               
               
                 A12= 
                   1.6056E−02 
                   4.1157E−02 
                   3.3399E−02 
                   7.0100E−03 
                 −1.2367E−02 
                 −5.6099E−03 
               
               
                 A14= 
                 −4.4260E−03 
                 −1.0396E−02 
                 −1.0292E−02 
                 −9.8895E−04 
                   5.0173E−03 
                   2.4788E−03 
               
               
                   
               
               
                 Surface # 
                 8 
                 9 
                 10 
                 11 
                 12 
                 13 
               
               
                   
               
               
                 k= 
                 −5.0000E+01 
                 −1.4079E+01 
                 −4.3881E+00  
                 −3.3508E+00  
                 −1.0000E+00  
                 −5.0000E+01 
               
               
                 A4= 
                   1.4352E−01 
                   7.6047E−02 
                 −1.4369E−01  
                 −9.8487E−02 
                 −6.7196E−02 
                 −7.1444E−02 
               
               
                 A6= 
                 −2.0305E−01  
                 −9.8651E−02 
                   1.3565E−02 
                   7.7099E−03 
                   1.3477E−02 
                   1.0519E−02 
               
               
                 A8= 
                   1.0955E−01 
                   5.8988E−02  
                 −1.3276E−02 
                   1.1459E−02  
                 −1.4277E−03 
                 −1.4535E−03 
               
               
                 A10= 
                 −1.0000E−01 
                 −2.2166E−02 
                   8.0197E−03 
                 −5.3996E−03 
                   1.7355E−05 
                   1.1041E−04 
               
               
                 A12= 
                   3.4502E−02 
                   4.3706E−03 
                 −1.8793E−03 
                   9.5782E−04 
                   3.9541E−05 
                   6.5097E−08 
               
               
                 A14= 
                 −4.5652E−03 
                   3.3138E−04  
                 −2.6672E−04  
                 −4.3261E−05  
                 −3.7683E−06 
                 −1.4126E−06 
               
               
                   
               
            
           
         
       
     
     In the 3rd embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 3rd embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from TABLE 5 and TABLE 6 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 3rd Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f (mm) 
                 6.07 
                 f/ImgH 
                 2.43 
               
               
                 Fno 
                 2.40 
                 f12/f3456 
                 0.11 
               
               
                 HFOV (deg.) 
                 22.0 
                 Y11/Y62 
                 0.62 
               
               
                 V4 
                 23.3 
                 SAG62 + CT6 (mm) 
                 −0.25 
               
               
                 Nmax 
                 1.640 
                 (ΣCT + ΣAT)/SD 
                 1.10 
               
               
                 CT6/T12 
                 7.24 
                 (ΣCT + ΣAT)/ΣCT 
                 2.02 
               
               
                 T56/CTmax 
                 1.95 
                 TL/f 
                 1.02 
               
               
                 f/R1 
                 3.26 
                 TL/ImgH 
                 2.47 
               
               
                   
               
            
           
         
       
     
     4th Embodiment 
       FIG.  7    is a schematic view of an imaging apparatus according to the 4th embodiment of the present disclosure.  FIG.  8    shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 4th embodiment. 
     In  FIG.  7   , the imaging apparatus includes the imaging optical lens assembly (its reference numeral is omitted) and an image sensor  490 . The imaging optical lens assembly includes, in order from an object side to an image side, an aperture stop  400 , a first lens element  410 , a second lens element  420 , a third lens element  430 , a fourth lens element  440 , a fifth lens element  450 , a sixth lens element  460 , an IR-cut filter  470  and an image surface  480 . The image sensor  490  is disposed on the image surface  480  of the imaging optical lens assembly. The imaging optical lens assembly has a total of six lens elements ( 410 - 460 ) with refractive power. Moreover, there is an air gap between any two of the first lens element  410 , the second lens element  420 , the third lens element  430 , the fourth lens element  440 , the fifth lens element  450 , and the sixth lens element  460  that are adjacent to each other and there is no relative movement among the lens elements ( 410 - 460 ) with refractive power. 
     The first lens element  410  with positive refractive power has a convex object-side surface  411  and a concave image-side surface  412 . The first lens element  410  is made of plastic material and has both the object-side surface  411  and the image-side surface  412  being aspheric. 
     The second lens element  420  with negative refractive power has a convex object-side surface  421  and a concave image-side surface  422 . The second lens element  420  is made of plastic material and has both the object-side surface  421  and the image-side surface  422  being aspheric. 
     The third lens element  430  with positive refractive power has a convex object-side surface  431  and a concave image-side surface  432 . The third lens element  430  is made of plastic material and has both the object-side surface  431  and the image-side surface  432  being aspheric. 
     The fourth lens element  440  with positive refractive power has a concave object-side surface  441  and a convex image-side surface  442 . The fourth lens element  440  is made of plastic material and has both the object-side surface  441  and the image-side surface  442  being aspheric. 
     The fifth lens element  450  with negative refractive power has a convex object-side surface  451  and a concave image-side surface  452 . The fifth lens element  450  is made of plastic material and has both the object-side surface  451  and the image-side surface  452  being aspheric. Furthermore, both of the object-side surface  451  and the image-side surface  452  of the fifth lens element  450  have at least one inflection point. The object-side surface  451  of the fifth lens element  450  changes from a convex shape to a concave shape from a paraxial region thereof to an off-axis region thereof. 
     The sixth lens element  460  with negative refractive power has a concave object-side surface  461  and a convex image-side surface  462 . The sixth lens element  460  is made of plastic material and has both the object-side surface  461  and the image-side surface  462  being aspheric. Furthermore, the object-side surface  461  of the sixth lens element  460  has at least one inflection point. 
     The IR-cut filter  470  is made of glass material and located between the sixth lens element  460  and the image surface  480 , and will not affect the focal length of the imaging optical lens assembly. 
     Furthermore, in the imaging optical lens assembly of the imaging apparatus according to the 4th embodiment, when an Abbe number of the first lens element  410  is V1, an Abbe number of the second lens element  420  is V2, an Abbe number of the third lens element  430  is V3, an Abbe number of the fourth lens element  440  is V4, an Abbe number of the fifth lens element  450  is V5, and an Abbe number of the sixth lens element  460  is V6, three (V2=23.3, V4=21.4 and V6=21.4) of V1, V2, V3, V4, V5 and V6 are smaller than 27. 
     In the imaging optical lens assembly of the imaging apparatus according to the 4th embodiment, when an axial distance between the first lens element  410  and the second lens element  420  is T 12 , an axial distance between the second lens element  420  and the third lens element  430  is T 23 , an axial distance between the third lens element  430  and the fourth lens element  440  is T 34 , an axial distance between the fourth lens element  440  and a fifth lens element  450  is T 45 , and the axial distance between the fifth lens element  450  and the sixth lens element  460  is T 56 , the following conditions are satisfied: 0&lt;T 12 &lt;T 23 &lt;T 56 ; 0&lt;T 12 &lt;T 34 &lt;T 56 ; 0&lt;T 45 &lt;T 23 &lt;T 56 ; and 0&lt;T 45 &lt;T 34 &lt;T 56 . 
     The detailed optical data of the 4th embodiment are shown in TABLE 7 and the aspheric surface data are shown in TABLE 8 below. 
     
       
         
           
               
             
               
                 TABLE 7 
               
             
            
               
                   
               
               
                 4th Embodiment 
               
               
                 f = 6.75 mm, Fno = 2.60, HFOV = 20.0 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                   
                 Curvature  
                   
                   
                   
                   
                 Focal 
               
               
                 Surface # 
                   
                 Radius 
                 Thickness 
                 Material 
                 Index 
                 Abbe # 
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 0 
                 Object 
                 Plano 
                   
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 Ape. Stop 
                 Plano 
                   
                 −0.507 
                   
                   
                   
                   
               
               
                 2 
                 Lens 1 
                 1.835 
                 ASP 
                 0.734 
                 Plastic 
                 1.544 
                 55.9 
                 3.49 
               
               
                 3 
                   
                 45.643 
                 ASP 
                 0.051 
                   
                   
                   
                   
               
               
                 4 
                 Lens 2 
                 12.513 
                 ASP 
                 0.230 
                 Plastic 
                 1.639 
                 23.5 
                 −5.39 
               
               
                 6 
                   
                 2.682 
                 ASP 
                 0.379 
                   
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 6.769 
                 ASP 
                 0.491 
                 Plastic 
                 1.535 
                 55.7 
                 21.98 
               
               
                 7 
                   
                 15.548 
                 ASP 
                 0.318 
                   
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 −18.982 
                 ASP 
                 0.304 
                 Plastic 
                 1.650 
                 21.4 
                 14.40 
               
               
                 9 
                   
                 −6.307 
                 ASP 
                 0.200 
                   
                   
                   
                   
               
               
                 10 
                 Lens 5 
                 1.671 
                 ASP 
                 0.230 
                 Plastic 
                 1.535 
                 55.7 
                 −8.67 
               
               
                 11 
                   
                 1.169 
                 ASP 
                 2.224 
                   
                   
                   
                   
               
               
                 12 
                 Lens 6 
                 −2.533 
                 ASP 
                 0.299 
                 Plastic 
                 1.650 
                 21.4 
                 −9.96 
               
               
                 13 
                   
                 4.355 
                 ASP 
                 0.300 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 14 
                 IR-cut filter 
                 Plano 
                 0.285 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 15 
                   
                 Plano 
                 0.203 
                   
                   
                   
                   
               
               
                 16 
                 Image 
                 Plano 
                 — 
                   
                   
                   
                   
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 8 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 Surface # 
                 2 
                 3 
                 4 
                 5 
                 6 
                 7 
               
               
                   
               
               
                 k= 
                   1.2596E−01 
                 −1.0000E+00 
                   5.0000E+01 
                 −6.7314E+00 
                   9.2963E+00  
                 −4.0457E+01 
               
               
                 A4= 
                 −2.8799E−04  
                 −3.3261E−02 
                 −9.9567E−02 
                 −2.5714E−02  
                 −1.6535E−02  
                 −2.6025E−02 
               
               
                 A6= 
                 −1.3309E−02  
                   8.4736E−02 
                   1.8198E−01 
                   1.1508E−01 
                   3.1761E−02 
                 −2.1431E−02 
               
               
                 A8= 
                   2.4365E−02 
                 −1.9405E−02  
                 −1.0901E−01 
                 −7.4308E−02 
                 −1.4777E−03 
                   3.0201E−02 
               
               
                 A10= 
                 −2.5891E−02 
                 −5.0215E−02 
                 −3.6966E−03  
                   2.0047E−02 
                   6.7774E−03 
                 −4.4171E−03 
               
               
                 A12= 
                   1.3832E−02 
                   4.0309E−02 
                   3.1215E−02 
                   1.0601E−02 
                 −7.0068E−03  
                 −1.4514E−02 
               
               
                 A14= 
                 −3.4429E−03 
                 −9.4700E−03  
                 −8.9112E−03  
                 −3.9518E−03 
                   1.4524E−03  
                   4.9649E−03 
               
               
                   
               
               
                 Surface # 
                 8 
                 9 
                 10 
                 11 
                 12 
                 13 
               
               
                   
               
               
                 k= 
                   4.0451E+01 
                   1.4098E+01 
                 −7.5169E+00 
                 −4.6130E+00  
                 −2.8151E+00 
                   3.0008E+00 
               
               
                 A4= 
                   6.4209E−02 
                   6.0062E−02 
                 −2.4726E−01 
                 −1.6188E−01 
                 −8.0876E−02 
                 −8.5266E−02 
               
               
                 A6= 
                 −1.9999E−01  
                 −1.3610E−01 
                   4.5228E−02 
                   4.6699E−02 
                   1.7365E−02 
                   2.3127E−02 
               
               
                 A8= 
                   1.5497E−01 
                   5.8528E−02 
                 −2.6939E−02 
                   1.3031E−02 
                 −1.3021E−03 
                 −3.3035E−03 
               
               
                 A10= 
                 −9.9971E−02 
                 −1.5917E−02 
                   5.0002E−04 
                 −1.3123E−02 
                   1.9333E−04 
                   4.9053E−04 
               
               
                 A12= 
                   3.3689E−02 
                   5.6644E−03 
                   1.3810E−02 
                   2.8642E−03 
                   1.2486E−04  
                 −2.6989E−05 
               
               
                 A14= 
                 −2.4741E−03 
                 −6.1617E−04 
                 −8.9917E−03 
                   4.0047E−05 
                 −2.5616E−05  
                   5.3533E−06 
               
               
                   
               
            
           
         
       
     
     In the 4th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 4th embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from TABLE 7 and TABLE 8 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 4th Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f (mm) 
                 6.75 
                 f/ImgH 
                 2.70 
               
               
                 Fno 
                 2.60 
                 f12/f3456 
                 −0.54 
               
               
                 HFOV (deg.) 
                 20.0 
                 Y11/Y62 
                 0.67 
               
               
                 V4 
                 21.4 
                 SAG62 + CT6 (mm) 
                 −0.59 
               
               
                 Nmax 
                 1.650 
                 (ΣCT + ΣAT)/SD 
                 1.10 
               
               
                 CT6/T12 
                 5.86 
                 (ΣCT + ΣAT)/ΣCT 
                 2.39 
               
               
                 T56/CTmax 
                 3.03 
                 TL/f 
                 0.93 
               
               
                 f/R1 
                 3.68 
                 TL/ImgH 
                 2.50 
               
               
                   
               
            
           
         
       
     
     5th Embodiment 
       FIG.  9    is a schematic view of an imaging apparatus according to the 5th embodiment of the present disclosure.  FIG.  10    shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 5th embodiment. 
     In  FIG.  9   , the imaging apparatus includes the imaging optical lens assembly (its reference numeral is omitted) and an image sensor  590 . The imaging optical lens assembly includes, in order from an object side to an image side, an aperture stop  500 , a first lens element  510 , a second lens element  520 , a third lens element  530 , a fourth lens element  540 , a fifth lens element  550 , a sixth lens element  560 , an IR-cut filter  570  and an image surface  580 . The image sensor  590  is disposed on the image surface  580  of the imaging optical lens assembly. The imaging optical lens assembly has a total of six lens elements ( 510 - 560 ) with refractive power. Moreover, there is an air gap between any two of the first lens element  510 , the second lens element  520 , the third lens element  530 , the fourth lens element  540 , the fifth lens element  550 , and the sixth lens element  560  that are adjacent to each other and there Is no relative movement among the lens elements ( 510 - 560 ) with refractive power. 
     The first lens element  510  with positive refractive power has a convex object-side surface  511  and a concave image-side surface  512 . The first lens element  510  is made of plastic material and has both the object-side surface  511  and the image-side surface  512  being aspheric. 
     The second lens element  520  with negative refractive power has a convex object-side surface  521  and a concave image-side surface  522 . The second lens element  520  is made of plastic material and has both the object-side surface  521  and the image-side surface  522  being aspheric. 
     The third lens element  530  with positive refractive power has a convex object-side surface  531  and a concave image-side surface  532 . The third lens element  530  is made of plastic material and has both the object-side surface  531  and the image-side surface  532  being aspheric. 
     The fourth lens element  540  with negative refractive power has a concave object-side surface  541  and a convex image-side surface  542 . The fourth lens element  540  is made of plastic material and has both the object-side surface  541  and the image-side surface  542  being aspheric. 
     The fifth lens element  550  with positive refractive power has a convex object-side surface  551  and a concave image-side surface  552 . The fifth lens element  550  is made of plastic material and has both the object-side surface  551  and the image-side surface  552  being aspheric. Furthermore, both of the object-side surface  551  and the image-side surface  552  of the fifth lens element  550  have at least one inflection point. The object-side surface  551  of the fifth lens element  550  changes from a convex shape to a concave shape from a paraxial region thereof to an off-axis region thereof. 
     The sixth lens element  560  with negative refractive power has a concave object-side surface  561  and a convex image-side surface  562 . The sixth lens element  560  is made of plastic material and has both the object-side surface  561  and the image-side surface  562  being aspheric. Furthermore, the object-side surface  561  of the sixth lens element  560  has at least one inflection point. 
     The IR-cut filter  570  is made of glass material and located between the sixth lens element  560  and the image surface  580 , and will not affect the focal length of the imaging optical lens assembly. 
     In the imaging optical lens assembly of the imaging apparatus according to the 5th embodiment, when an axial distance between the first lens element  510  and the second lens element  520  is T 12 , an axial distance between the second lens element  520  and the third lens element  530  is T 23 , an axial distance between the third lens element  530  and the fourth lens element  540  is T 34 , an axial distance between the fourth lens element  540  and a fifth lens element  550  is T 45 , and the axial distance between the fifth lens element  550  and the sixth lens element  560  is T 56 , the following conditions are satisfied: 0&lt;T 12 &lt;T 23 &lt;T 56 ; 0&lt;T 12 &lt;T 34 &lt;T 56 ; 0&lt;T 45 &lt;T 23 &lt;T 56 ; and 0&lt;T 45 &lt;T 34 &lt;T 56 . 
     The detailed optical data of the 5th embodiment are shown in TABLE 9 and the aspheric surface data are shown in TABLE 10 below. 
     
       
         
           
               
             
               
                 TABLE 9 
               
             
            
               
                   
               
               
                 5th Embodiment 
               
               
                 f = 5.42 mm, Fno = 2.40, HFOV = 22.0 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 Surface  
                   
                   
                   
                   
                   
                   
                 Abbe 
                 Focal 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 # 
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 Ape. Stop 
                 Plano 
                 −0.418 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 2 
                 Lens 1 
                 1.655 
                 ASP 
                 0.601 
                 Plastic 
                 1.535 
                 55.7 
                 3.94 
               
               
                 3 
                   
                 6.736 
                 ASP 
                 0.071 
                   
                   
                   
                   
               
               
                 4 
                 Lens 2 
                 10.246 
                 ASP 
                 0.230 
                 Plastic 
                 1.650 
                 21.4 
                 −6.84 
               
               
                 5 
                   
                 3.071 
                 ASP 
                 0.598 
                   
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 1.631 
                 ASP 
                 0.551 
                 Plastic 
                 1.544 
                 56.9 
                 7.15 
               
               
                 7 
                   
                 2.473 
                 ASP 
                 0.549 
                   
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 −2.305 
                 ASP 
                 0.200 
                 Plastic 
                 1.644 
                 66.9 
                 −33.76 
               
               
                 9 
                   
                 −2.717 
                 ASP 
                 0.200 
                   
                   
                   
                   
               
               
                 10 
                 Lens 5 
                 3.315 
                 ASP 
                 0.238 
                 Plastic 
                 1.544 
                 55.9 
                 1006.78 
               
               
                 11 
                   
                 3.251 
                 ASP 
                 0.632 
                   
                   
                   
                   
               
               
                 12 
                 Lens 6 
                 −1.804 
                 ASP 
                 0.806 
                 Plastic 
                 1.535 
                 55.7 
                 −4.90 
               
               
                 13 
                   
                 −6.679 
                 ASP 
                 0.300 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 14 
                 IR-cut filter 
                 Plano 
                 0.210 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 15 
                   
                 Plano 
                 0.147 
                   
                   
                   
                   
               
               
                 16 
                 Image 
                 Plano 
                 — 
                   
                   
                   
                   
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 687.6 nm (d-line). 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 10 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 Surface # 
                 2 
                 3 
                 4 
                 5 
                 6 
                 7 
               
               
                   
               
               
                 k= 
                   4.3616E−01 
                 −1.0000E+00 
                   1.3577E+01 
                 −1.2145E+01 
                 −2.9240E+00 
                 −1.0000E+00 
               
               
                 A4= 
                 −1.2220E−02 
                 −8.8410E−02  
                 −1.7082E−01 
                 −8.0685E−02 
                 −1.5974E−02 
                 −7.4788E−02 
               
               
                 A6= 
                 −2.3220E−02 
                   1.5973E−01 
                   3.5830E−01 
                   2.5427E−01 
                   1.8284E−02 
                 −5.3216E−02 
               
               
                 A8= 
                   5.7066E−02 
                 −6.1857E−02 
                 −2.7622E−01 
                 −2.0426E−01 
                 −2.7264E−02 
                   2.6338E−02 
               
               
                 A10= 
                 −9.6752E−02 
                 −1.6488E−01 
                 −7.0033E−03 
                   5.3188E−02 
                   5.5564E−02 
                 −4.0540E−05 
               
               
                 A12= 
                   6.7099E−02 
                   2.0231E−01 
                   1.3979E−01 
                   5.1809E−02 
                 −4.6149E−02 
                 −2.0941E−02 
               
               
                 A14= 
                 −1.9418E−02 
                 −6.8664E−02  
                 −5.8961E−02 
                 −3.1468E−02 
                   1.6014E−02 
                   1.3043E−02 
               
               
                   
               
               
                 Surface # 
                 8 
                 9 
                 10 
                 11 
                 12 
                 13 
               
               
                   
               
               
                 k= 
                   1.4461E+00 
                   1.8665E+00 
                 −5.0000E+01 
                 −4.7148E+01 
                 −1.2183E+00 
                   4.0930E+00 
               
               
                 A4= 
                   1.6807E−01 
                   9.3275E−02  
                 −3.5624E−01 
                 −2.9584E−01 
                 −1.2495E−01 
                 −1.3358E−01 
               
               
                 A6= 
                 −3.9083E−01 
                 −1.5366E−01 
                   4.4013E−02 
                   5.6045E−02 
                   1.5797E−02 
                   4.5014E−02 
               
               
                 A8= 
                   4.5244E−01 
                   1.8712E−01 
                 −3.2451E−02 
                   1.1562E−02 
                   1.5745E−03 
                 −8.0235E−03 
               
               
                 A10= 
                 −3.5241E−01 
                 −7.7037E−02 
                   3.9325E−02 
                 −1.4446E−02 
                   5.8587E−03 
                 −5.7257E−04 
               
               
                 A12= 
                   1.4616E−01 
                   1.3536E−02 
                   2.9391E−03 
                   1.5624E−02 
                 −1.5646E−02 
                   3.8901E−05 
               
               
                 A14= 
                 −3.5575E−02 
                 −1.3044E−02  
                 −7.4786E−03 
                 −1.7771E−03 
                   7.3600E−03 
                   7.0481E−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 the following table are the same as those stated in the 1st embodiment with corresponding values for the 5th embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from TABLE 9 and TABLE 10 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 5th Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f (mm) 
                 5.42 
                 f/ImgH 
                 2.43 
               
               
                 Fno 
                 2.40 
                 f12/f3456 
                 −0.20 
               
               
                 HFOV (deg.) 
                 22.0 
                 Y11/Y62 
                 0.65 
               
               
                 V4 
                 55.9 
                 SAG62 + CT6 (mm) 
                 −0.06 
               
               
                 Nmax 
                 1.650 
                 (ΣCT + ΣAT)/SD 
                 1.10 
               
               
                 CT6/T12 
                 11.35 
                 (ΣCT + ΣAT)/ΣCT 
                 1.78 
               
               
                 T56/CTmax 
                 0.78 
                 TL/f 
                 0.98 
               
               
                 f/R1 
                 3.27 
                 TL/ImgH 
                 2.39 
               
               
                   
               
            
           
         
       
     
     6th Embodiment 
       FIG.  11    is a schematic view of an imaging apparatus according to the 6th embodiment of the present disclosure.  FIG.  12    shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 6th embodiment. 
     In  FIG.  11   , the imaging apparatus includes the imaging optical lens assembly (its reference numeral is omitted) and an image sensor  690 . The imaging optical lens assembly includes, in order from an object side to an image side, an aperture stop  600 , a first lens element  610 , a second lens element  620 , a third lens element  630 , a fourth lens element  640 , a fifth lens element  650 , a sixth lens element  660 , an IR-cut filter  670  and an image surface  680 . The image sensor  690  is disposed on the image surface  180  of the imaging optical lens assembly. The imaging optical lens assembly has a total of six lens elements ( 610 - 660 ) with refractive power. Moreover, there is an air gap between any two of the first lens element  610 , the second lens element  620 , the third lens element  630 , the fourth lens element  640 , the fifth lens element  660 , and the sixth lens element  660  that are adjacent to each other and there is no relative movement among the lens elements ( 610 - 660 ) with refractive power. 
     The first lens element  610  with positive refractive power has a convex object-side surface  611  and a convex image-side surface  612 . The first lens element  610  is made of plastic material and has both the object-side surface  611  and the image-side surface  612  being aspheric. 
     The second lens element  620  with negative refractive power has a concave object-side surface  621  and a concave image-side surface  622 . The second lens element  620  is made of plastic material and has both the object-side surface  621  and the image-side surface  622  being aspheric. 
     The third lens element  630  with positive refractive power has a convex object-side surface  631  and a concave image-side surface  632 . The third lens element  630  is made of plastic material and has both the object-side surface  631  and the image-side surface  632  being aspheric. 
     The fourth lens element  640  with negative refractive power has a concave object-side surface  641  and a convex image-side surface  642 . The fourth lens element  640  is made of plastic material and has both the object-side surface  641  and the image-side surface  642  being aspheric. 
     The fifth lens element  650  with positive refractive power has a convex object-side surface  651  and a concave Image-side surface  652 . The fifth lens element  650  is made of plastic material and has both the object-side surface  651  and the image-side surface  652  being aspheric. Furthermore, both of the object-side surface  651  and the image-side surface  652  of the fifth lens element  650  have at least one inflection point. The object-side surface  651  of the fifth lens element  650  changes from a convex shape to a concave shape from a paraxlal region thereof to an off-axis region thereof. 
     The sixth lens element  660  with negative refractive power has a concave object-side surface  661  and a convex image-side surface  662 . The sixth lens element  660  is made of plastic material and has both the object-side surface  661  and the image-side surface  662  being aspheric. Furthermore, the object-side surface  661  of the sixth lens element  660  has at least one inflection point. 
     The IR-cut filter  670  is made of glass material and located between the sixth lens element  660  and the image surface  680 , and will not affect the focal length of the imaging optical lens assembly. 
     Furthermore, in the imaging optical lens assembly of the imaging apparatus according to the 6th embodiment, when an Abbe number of the first lens element  610  is V1, an Abbe number of the second lens element  620  is V2, an Abbe number of the third lens element  630  is V3, an Abbe number of the fourth lens element  640  is V4, an Abbe number of the fifth lens element  650  is V5, and an Abbe number of the sixth lens element  660  is V6, two (V2=25.6 and V4=21.4) of V1, V2, V3, V4, V5 and V6 are smaller than 27. 
     In the imaging optical lens assembly of the imaging apparatus according to the 6th embodiment, when an axial distance between the first lens element  610  and the second lens element  620  is T 12 , an axial distance between the second lens element  620  and the third lens element  630  is T 23 , an axial distance between the third lens element  630  and the fourth lens element  640  is T 34 , an axial distance between the fourth lens element  640  and a fifth lens element  650  is T 45 , and the axial distance between the fifth lens element  650  and the sixth lens element  660  is T 56 , the following conditions are satisfied: 0&lt;T 12 &lt;T 23 &lt;T 56 ; 0&lt;T 12 &lt;T 34 &lt;T 56 ; 0&lt;T 45 &lt;T 23 &lt;T 56 ; and 0&lt;T 45 &lt;T 34 &lt;T 56 . 
     The detailed optical data of the 6th embodiment are shown in TABLE 11 and the aspheric surface data are shown in TABLE 12 below. 
     
       
         
           
               
             
               
                 TABLE 11 
               
             
            
               
                   
               
               
                 6th Embodiment 
               
               
                 f = 5.16 mm, Fno = 2.60, HFOV = 23.0 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 Surface  
                   
                   
                   
                   
                   
                   
                 Abbe  
                 Focal 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 # 
                   
                 Curvature Radius 
                 Thickness  
                 Material 
                 Index 
                 # 
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 Ape. Stop 
                 Plano 
                 −0.336 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 2 
                 Lens 1 
                 1.644 
                 ASP 
                 0.634 
                 Plastic 
                 1.530 
                 55.8 
                 2.98 
               
               
                 3 
                   
                 −34.117 
                 ASP 
                 0.067 
                   
                   
                   
                   
               
               
                 4 
                 Lens 2 
                 −64.185 
                 ASP 
                 0.230 
                 Plastic 
                 1.614 
                 25.6 
                 −4.94 
               
               
                 6 
                   
                 3.188 
                 ASP 
                 0.315 
                   
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 4.626 
                 ASP 
                 0.503 
                 Plastic 
                 1.530 
                 55.8 
                 15.80 
               
               
                 7 
                   
                 10.109 
                 ASP 
                 0.703 
                   
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 −2.203 
                 ASP 
                 0.352 
                 Plastic 
                 1.650 
                 21.4 
                 −146.24 
               
               
                 9 
                   
                 −2.397 
                 ASP 
                 0.020 
                   
                   
                   
                   
               
               
                 10 
                 Lens 5 
                 1.806 
                 ASP 
                 0.391 
                 Plastic 
                 1.530 
                 55.8 
                 139.42 
               
               
                 11 
                   
                 1.712 
                 ASP 
                 0.891 
                   
                   
                   
                   
               
               
                 12 
                 Lens 6 
                 −1.837 
                 ASP 
                 0.330 
                 Plastic 
                 1.530 
                 55.8 
                 −7.02 
               
               
                 13 
                   
                 −3.854 
                 ASP 
                 0.300 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 14 
                 IR-cut filter 
                 Plano 
                 0.260 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 15 
                   
                 Plano 
                 0.315 
                   
                   
                   
                   
               
               
                 16 
                 Image 
                 Plano 
                 — 
                   
                   
                   
                   
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 12 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 Surface # 
                 2 
                 3 
                 4 
                 5 
                 6 
                 7 
               
               
                   
               
               
                 k= 
                   1.2654E−01 
                 −1.0000E+00 
                 −5.0000E+01 
                 −1.9659E+01 
                 −1.0000E+01 
                 −2.8463E+01 
               
               
                 A4= 
                 −2.4927E−03 
                 −8.6248E−02 
                 −1.7159E−01 
                 −6.9235E−02 
                 −1.1697E−01 
                 −7.1597E−02 
               
               
                 A6= 
                 −1.8464E−02 
                   1.3957E−01 
                   3.6160E−01 
                   2.2052E−01 
                   1.1107E−02 
                 −4.8755E−02 
               
               
                 A8= 
                   4.5709E−02 
                 −4.7487E−02 
                 −2.9257E−01 
                 −1.9288E−01 
                 −6.7357E−03 
                   2.4864E−02 
               
               
                 A10= 
                 −8.7140E−02 
                 −1.6203E−01 
                   2.7957E−04 
                   7.5139E−02 
                   4.2751E−02 
                   1.5568E−03 
               
               
                 A12= 
                   7.6571E−02 
                   1.8948E−01  
                   1.6079E−01 
                   3.7867E−02 
                 −5.9113E−02 
                 −1.6567E−02 
               
               
                 A14= 
                 −3.3550E−02 
                 −6.6977E−02  
                 −6.8773E−02 
                 −9.7848E−03 
                   4.2349E−02 
                   9.6223E−03 
               
               
                   
               
               
                 Surface # 
                 8 
                 9 
                 10 
                 11 
                 12 
                 13 
               
               
                   
               
               
                 k= 
                 −7.0155E−01 
                   5.1647E−01 
                 −6.7710E+00 
                 −7.6443E+00 
                 −2.9201E+00 
                   3.3329E−01 
               
               
                 A4= 
                   2.2368E−01 
                   1.0506E−01 
                 −2.1298E−01 
                 −8.8842E−02 
                 −6.0816E−02 
                 −4.1518E−02 
               
               
                 A6= 
                 −4.6445E−01 
                 −1.7474E−01 
                   8.5405E−02 
                   9.3693E−03 
                   2.2988E−02 
                   1.4491E−02 
               
               
                 A8= 
                   4.6149E−01 
                   1.3238E−01 
                 −4.0498E−02 
                   3.1194E−02 
                 −1.5438E−03 
                 −4.0663E−03 
               
               
                 A10= 
                 −3.6106E−01 
                 −8.6280E−02 
                   1.5625E−02 
                 −1.9359E−02 
                   2.2878E−04 
                   1.0786E−04 
               
               
                 A12= 
                   1.3584E−01 
                   2.9434E−02 
                 −5.4203E−03 
                   4.4252E−03 
                   4.4273E−05 
                 −1.6217E−05 
               
               
                 A14= 
                 −1.7714E−02 
                 −2.7244E−03  
                 −7.2865E−04 
                 −2.9371E−04 
                   4.4629E−07 
                   7.5068E−06 
               
               
                   
               
            
           
         
       
     
     In the 6th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 6th embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from TABLE 11 and TABLE 12 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 6th Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f (mm) 
                 5.15 
                 f/ImgH 
                 2.31 
               
               
                 Fno 
                 2.50 
                 f12/f3456 
                 −0.30 
               
               
                 HFOV (deg.) 
                 23.0 
                 Y11/Y62 
                 0.60 
               
               
                 V4 
                 21.4 
                 SAG62 + CT6 (mm) 
                 −0.35 
               
               
                 Nmax 
                 1.650 
                 (ΣCT + ΣAT)/SD 
                 1.08 
               
               
                 CT6/T12 
                 5.79 
                 (ΣCT + ΣAT)/ΣCT 
                 1.81 
               
               
                 T56/CTmax 
                 1.41 
                 TL/f 
                 1.03 
               
               
                 f/R1 
                 3.14 
                 TL/ImgH 
                 2.38 
               
               
                   
               
            
           
         
       
     
     7th Embodiment 
       FIG.  13    is a schematic view of an imaging apparatus according to the 7th embodiment of the present disclosure.  FIG.  14    shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 7th embodiment. 
     In  FIG.  13   , the imaging apparatus includes the imaging optical lens assembly (its reference numeral is omitted) and an Image sensor  790 . The imaging optical lens assembly includes, in order from an object side to an image side, a first lens element  710 , an aperture stop  700 , a second lens element  720 , a third lens element  730 , a fourth lens element  740 , a fifth lens element  750 , a sixth lens element  760 , an IR-cut filter  770  and an image surface  780 . The image sensor  790  is disposed on the image surface  780  of the imaging optical lens assembly. The imaging optical lens assembly has a total of six lens elements ( 710 - 760 ) with refractive power. Moreover, there is an air gap between any two of the first lens element  710 , the second lens element  720 , the third lens element  730 , the fourth lens element  740 , the fifth lens element  750 , and the sixth lens element  760  that are adjacent to each other and there is no relative movement among the lens elements ( 710 - 760 ) with refractive power. 
     The first lens element  710  with positive refractive power has a convex object-side surface  711  and a convex image-side surface  712 . The first lens element  710  is made of plastic material and has both the object-side surface  711  and the image-side surface  712  being aspheric. 
     The second lens element  720  with negative refractive power has a concave object-side surface  721  and a concave image-side surface  722 . The second lens element  720  is made of plastic material and has both the object-side surface  721  and the image-side surface  722  being aspheric. 
     The third lens element  730  with negative refractive power has a convex object-side surface  731  and a concave image-side surface  732 . The third lens element  730  is made of plastic material and has both the object-side surface  731  and the image-side surface  732  being aspheric. 
     The fourth lens element  740  with positive refractive power has a convex object-side surface  741  and a convex image-side surface  742 . The fourth lens element  740  is made of plastic material and has both the object-side surface  741  and the image-side surface  742  being aspheric. 
     The fifth lens element  750  with negative refractive power has a convex object-side surface  751  and a concave image-side surface  752 . The fifth lens element  750  is made of plastic material and has both the object-side surface  751  and the image-side surface  752  being aspheric. Furthermore, both of the object-side surface  751  and the image-side surface  752  of the fifth lens element  750  have at least one inflection point. The object-side surface  751  of the fifth lens element  750  changes from a convex shape to a concave shape from a paraxial region thereof to an off-axis region thereof. 
     The sixth lens element  760  with negative refractive power has a concave object-side surface  761  and a convex image-side surface  762 . The sixth lens element  760  is made of plastic material and has both the object-side surface  761  and the image-side surface  762  being aspheric. Furthermore, the object-side surface  761  of the sixth lens element  760  has at least one inflection point. 
     The IR-cut filter  770  is made of glass material and located between the sixth lens element  760  and the image surface  780 , and will not affect the focal length of the imaging optical lens assembly. 
     Furthermore, in the imaging optical lens assembly of the imaging apparatus according to the 7th embodiment, when an Abbe number of the first lens element  710  is V1, an Abbe number of the second lens element  720  is V2, an Abbe number of the third lens element  730  is V3, an Abbe number of the fourth lens element  740  is V4, an Abbe number of the fifth lens element  750  is V5, and an Abbe number of the sixth lens element  760  is V6, two (V2=25.6 and V4=25.7) of V1, V2, V3, V4, V5 and V6 are smaller than 27. 
     In the imaging optical lens assembly of the imaging apparatus according to the 7th embodiment, when an axial distance between the first lens element  710  and the second lens element  720  is T 12 , an axial distance between the second lens element  720  and the third lens element  730  is T 23 , an axial distance between the third lens element  730  and the fourth lens element  740  is T 34 , an axial distance between the fourth lens element  740  and a fifth lens element  750  is T 45 , and the axial distance between the fifth lens element  750  and the sixth lens element  760  is T 56 , the following conditions are satisfied: 0&lt;T 12 &lt;T 23 &lt;T 56 ; 0&lt;T 12 &lt;T 34 &lt;T 56 ; 0&lt;T 45 &lt;T 23 &lt;T 56 ; and 0&lt;T 45 &lt;T 34 &lt;T 56 . 
     The detailed optical data of the 7th embodiment are shown in TABLE 13 and the aspheric surface data are shown in TABLE 14 below. 
     
       
         
           
               
             
               
                 TABLE 13 
               
             
            
               
                   
               
               
                 7th Embodiment 
               
               
                 f = 7.34 mm, Fno = 2.65, HFOV = 18.5 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 Surface 
                   
                   
                   
                   
                   
                   
                 Abbe  
                 Focal 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 # 
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 1 
                 Lens 1 
                 1.894 
                 ASP 
                 0.872 
                 Plastic 
                 1.535 
                 56.3 
                 3.12 
               
               
                 2 
                   
                 −11.754 
                 ASP 
                 0.030 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 3 
                 Ape. Stop 
                 Plano 
                 0.024 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 4 
                 Lens 2 
                 −77.648 
                 ASP 
                 0.230 
                 Plastic 
                 1.614 
                 25.6 
                 −3.92 
               
               
                 5 
                   
                 2.487 
                 ASP 
                 0.317 
                   
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 5.500 
                 ASP 
                 0.340 
                 Plastic 
                 1.535 
                 66.3 
                 −60.34 
               
               
                 7 
                   
                 4.597 
                 ASP 
                 0.241 
                   
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 11.705 
                 ASP 
                 0.468 
                 Plastic 
                 1.608 
                 26.7 
                 8.25 
               
               
                 9 
                   
                 −8.638 
                 ASP 
                 0.179 
                   
                   
                   
                   
               
               
                 10 
                 Lens 6 
                 1.714 
                 ASP 
                 0.230 
                 Plastic 
                 1.644 
                 65.9 
                 −10.62 
               
               
                 11 
                   
                 1.259 
                 ASP 
                 2.748 
                   
                   
                   
                   
               
               
                 12 
                 Lens 6 
                 −2.638 
                 ASP 
                 0.304 
                 Plastic 
                 1.635 
                 66.3 
                 −15.40 
               
               
                 13 
                   
                 −4.037 
                 ASP 
                 0.300 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 14 
                 IR-cut filter 
                 Plano 
                 0.300 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 15 
                   
                 Plano 
                 0.248 
                   
                   
                   
                   
               
               
                 16 
                 Image 
                 Plano 
                 — 
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 14 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 Surface # 
                 1 
                 2 
                 4 
                 5 
                 6 
                 7 
               
               
                   
               
               
                 k= 
                   1.3548E−01 
                 −1.0000E+00 
                 −5.0000E+01 
                 −4.7830E+00 
                 −1.0000E+00 
                 −1.4447E+01 
               
               
                 A4= 
                 −1.3365E−03 
                 −1.5478E−02 
                 −6.7159E−02 
                 −7.5782E−03  
                 −4.3870E−02 
                 −4.3815E−02 
               
               
                 A6= 
                 −7.3293E−03 
                   5.0418E−02 
                   1.2146E−01 
                   7.4770E−02 
                   2.9576E−02  
                 −1.9454E−02 
               
               
                 A8= 
                   1.1371E−02 
                 −9.7175E−03  
                 −6.3978E−02  
                 −4.2395E−02 
                 −2.9239E−03 
                   2.3640E−02 
               
               
                 A10= 
                 −1.1736E−02 
                 −2.2992E−02  
                 −1.8916E−03 
                   1.1770E−02 
                   5.8726E−03 
                   2.3400E−03 
               
               
                 A12= 
                   6.1517E−03 
                   1.5264E−02 
                   1.3861E−02 
                   3.9561E−03  
                 −1.3121E−03 
                 −6.7124E−03 
               
               
                 A14= 
                 −1.5286E−03 
                 −2.9579E−03 
                 −3.2776E−03 
                   7.1360E−04  
                 −5.4848E−04  
                 −5.8719E−04 
               
               
                   
               
               
                 Surface # 
                 8 
                 9 
                 10 
                 11 
                 12 
                 13 
               
               
                   
               
               
                 k= 
                 −3.4725E+01  
                   2.0000E+01 
                 −5.0891E+00  
                 −3.9429E+00  
                 −5.6805E+00 
                 −3.3676E+00 
               
               
                 A4= 
                   6.9614E−02 
                   5.5000E−02 
                 −2.3314E−01 
                 −1.6325E−01  
                 −5.1096E−02 
                 −3.6467E−02 
               
               
                 A6= 
                 −1.3617E−01 
                 −9.3344E−02  
                   3.0438E−02 
                   5.0934E−02 
                   1.1668E−02 
                   5.9971E−03 
               
               
                 A8= 
                   8.6542E−02 
                   2.5083E−02 
                   4.7505E−04 
                   1.4832E−02  
                 −2.2538E−03  
                 −1.7044E−03 
               
               
                 A10= 
                 −4.7114E−02 
                 −2.5731E−03 
                 −1.3566E−03  
                 −7.2769E−03 
                   2.8861E−05 
                   3.7451E−04 
               
               
                 A12= 
                   1.8130E−02 
                   2.8081E−03 
                   9.2896E−03 
                 −8.1351E−04 
                   1.3986E−04  
                 −4.8938E−05 
               
               
                 A14= 
                 −4.6189E−03 
                 −1.3237E−03  
                 −4.6847E−03 
                   4.9716E−04 
                 −1.6635E−05 
                   5.0114E−06 
               
               
                   
               
            
           
         
       
     
     In the 7th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 7th embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from TABLE 13 and TABLE 14 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 7th Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f (mm) 
                 7.34 
                 f/ImgH 
                 2.94 
               
               
                 Fno 
                 2.65 
                 f12/f3456 
                 −0.29 
               
               
                 HFOV (deg.) 
                 18.5 
                 Y11/Y62 
                 0.69 
               
               
                 V4 
                 25.7 
                 SAG62 + CT6 (mm) 
                 −0.55 
               
               
                 Nmax 
                 1.614 
                 (ΣCT + ΣAT)/SD 
                 1.18 
               
               
                 CT6/T12 
                 5.63 
                 (ΣCT + ΣAT)/ΣCT 
                 2.45 
               
               
                 T56/CTmax 
                 3.15 
                 TL/f 
                 0.93 
               
               
                 f/R1 
                 3.88 
                 TL/ImgH 
                 2.73 
               
               
                   
               
            
           
         
       
     
     8th Embodiment 
       FIG.  15    is a schematic view of an imaging apparatus according to the 8th embodiment of the present disclosure.  FIG.  16    shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 8th embodiment. 
     In  FIG.  15   , the imaging apparatus includes the imaging optical lens assembly (its reference numeral is omitted) and an image sensor  890 . The Imaging optical lens assembly includes, in order from an object side to an image side, an aperture stop  800 , a first lens element  810 , a second lens element  820 , a third lens element  830 , a fourth lens element  840 , a fifth lens element  850 , a sixth lens element  860 , an IR-cut filter  870  and an image surface  880 . The image sensor  890  is disposed on the image surface  880  of the imaging optical lens assembly. The imaging optical lens assembly has a total of six lens elements ( 810 - 860 ) with refractive power. Moreover, there is an air gap between any two of the first lens element  810 , the second lens element  820 , the third lens element  830 , the fourth lens element  840 , the fifth lens element  850 , and the sixth lens element  860  that are adjacent to each other and there is no relative movement among the lens elements ( 810 - 860 ) with refractive power. 
     The first lens element  810  with positive refractive power has a convex object-side surface  811  and a concave Image-side surface  812 . The first lens element  810  is made of plastic material and has both the object-side surface  811  and the image-side surface  812  being aspheric. 
     The second lens element  820  with negative refractive power has a convex object-side surface  821  and a concave image-side surface  822 . The second lens element  820  is made of plastic material and has both the object-side surface  821  and the image-side surface  822  being aspheric. 
     The third lens element  830  with positive refractive power has a convex object-side surface  831  and a concave image-side surface  832 . The third lens element  830  is made of plastic material and has both the object-side surface  831  and the image-side surface  832  being aspheric. 
     The fourth lens element  840  with negative refractive power has a concave object-side surface  841  and a convex image-side surface  842 . The fourth lens element  840  is made of plastic material and has both the object-side surface  841  and the image-side-surface  842  being aspheric. 
     The fifth lens element  850  with negative refractive power has a convex object-side surface  851  and a concave image-side surface  852 . The fifth lens element  850  is made of plastic material and has both the object-side surface  851  and the image-side surface  852  being aspheric. Furthermore, both of the object-side surface  851  and the image-side surface  852  of the fifth lens element  850  have at least one inflection point. The object-side surface  851  of the fifth lens element  850  changes from a convex shape to a concave shape from a paraxial region thereof to an off-axis region thereof. 
     The sixth lens element  860  with positive refractive power has a convex object-side surface  861  and a convex image-side surface  862 . The sixth lens element  860  is made of plastic material and has both the object-side surface  861  and the image-side surface  862  being aspheric. Furthermore, the object-side surface  861  of the sixth lens element  860  has at least one inflection point. 
     The IR-cut filter  870  is made of glass material and located between the sixth lens element  860  and the image surface  880 , and will not affect the focal length of the imaging optical lens assembly. 
     Furthermore, in the imaging optical lens assembly of the imaging apparatus according to the 8th embodiment, when an Abbe number of the first lens element  810  is V1, an Abbe number of the second lens element  820  is V2, an Abbe number of the third lens element  830  is V3, an Abbe number of the fourth lens element  840  is V4, an Abbe number of the fifth lens element  850  is V5, and an Abbe number of the sixth lens element  860  is V6, three (V2=23.3, V4=23.3 and V6=23.3) of V1, V2, V3, V4, V5 and V6 are smaller than 27. 
     The detailed optical data of the 8th embodiment are shown in TABLE 15 and the aspheric surface data are shown in TABLE 16 below. 
     
       
         
           
               
             
               
                 TABLE 15 
               
             
            
               
                   
               
               
                 8th Embodiment 
               
               
                 f = 6.37 mm, Fno = 2.80, HFOV = 17.0 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 Surface  
                   
                   
                   
                   
                   
                   
                 Abbe 
                 Focal 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 # 
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 Ape. Stop 
                 Plano 
                 −0.514 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 2 
                 Lens 1 
                 1.457 
                 ASP 
                 0.716 
                 Plastic 
                 1.544 
                 55.9 
                 2.96 
               
               
                 3 
                   
                 12.474 
                 ASP 
                 0.064 
                   
                   
                   
                   
               
               
                 4 
                 Lens 2 
                 14.903 
                 ASP 
                 0.230 
                 Plastic 
                 1.640 
                 23.3 
                 −5.36 
               
               
                 5 
                   
                 2.770 
                 ASP 
                 0.110 
                   
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 2.626 
                 ASP 
                 0.364 
                 Plastic 
                 1.544 
                 55.9 
                 12.88 
               
               
                 7 
                   
                 3.993 
                 ASP 
                 0.494 
                   
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 −2.426 
                 ASP 
                 0.220 
                 Plastic 
                 1.640 
                 23.3 
                 −86.25 
               
               
                 9 
                   
                 −2.627 
                 ASP 
                 0.450 
                   
                   
                   
                   
               
               
                 10 
                 Lens 5 
                 2.969 
                 ASP 
                 0.230 
                 Plastic 
                 1.644 
                 55.9 
                 −3.52 
               
               
                 11 
                   
                 1.132 
                 ASP 
                 1.162 
                   
                   
                   
                   
               
               
                 12 
                 Lens 6 
                 31.423 
                 ASP 
                 0.732 
                 Plastic 
                 1.640 
                 23.3 
                 35.12 
               
               
                 13 
                   
                 −78.128 
                 ASP 
                 0.300 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 14 
                 IR-cut filter 
                 Plano 
                 0.248 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 15 
                   
                 Plano 
                 0.143 
                   
                   
                   
                   
               
               
                 16 
                 Image 
                 Plano 
                 — 
                   
                   
                   
                   
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 16 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 Surface # 
                 2 
                 3 
                 4 
                 5 
                 6 
                 7 
               
               
                   
               
               
                 k= 
                   1.9802E−01 
                 −1.0000E+00 
                   5.0000E+01 
                 −1.9639E+01 
                 −1.0000E+00 
                   2.1192E+00 
               
               
                 A4= 
                 −8.0099E−03 
                 −7.6883E−02 
                 −1.7868E−01 
                 −8.8066E−02  
                 −1.3207E−01  
                   4.9263E−02 
               
               
                 A6= 
                 −1.6001E−02  
                   1.4821E−01 
                   3.5910E−01 
                   2.1239E−01 
                   3.5258E−02 
                 −1.1283E−01 
               
               
                 A8= 
                   4.4456E−02 
                 −4.6828E−02 
                 −2.9209E−01  
                 −1.8604E−01  
                 −1.1265E−02  
                   6.4287E−02 
               
               
                 A10= 
                 −8.9641E−02  
                 −1.6173E−01  
                   2.2248E−03 
                   8.4454E−02 
                   6.8727E−02 
                   5.4697E−03 
               
               
                 A12= 
                   7.8626E−02 
                   1.9180E−01 
                   1.6403E−01 
                   4.8885E−02 
                 −2.3754E−02 
                 −5.2041E−02 
               
               
                 A14= 
                 −2.9994E−02  
                 −6.3300E−02  
                 −6.7745E−02 
                   7.2581E−03 
                   2.0157E−02 
                   1.8733E−02 
               
               
                   
               
               
                 Surface # 
                 8 
                 9 
                 10 
                 11 
                 12 
                 13 
               
               
                   
               
               
                 k= 
                   3.0982E+00 
                   2.5114E−01 
                 −5.0000E+01  
                 −6.8815E+00  
                 −9.0000E+01  
                 −5.0000E+01 
               
               
                 A4= 
                   9.8721E−02 
                   1.6646E−01 
                 −3.2465E−01 
                 −1.5612E−01 
                 −5.5455E−02 
                 −1.2931E−01 
               
               
                 A6= 
                 −4.2039E−01 
                 −3.1764E−01 
                   7.4450E−02 
                   4.9819E−02 
                   3.9917E−02 
                   5.2352E−02 
               
               
                 A8= 
                   3.3086E−01 
                   1.2945E−01 
                 −1.0440E−01 
                   3.1516E−03 
                 −8.0167E−03 
                 −7.8884E−03 
               
               
                 A10= 
                 −4.5116E−01 
                 −2.0511E−02  
                 −2.2109E−02 
                 −2.4433E−02  
                 −1.9292E−04 
                   6.8734E−04 
               
               
                 A12= 
                   2.6965E−01 
                   2.7247E−02 
                   2.2105E−03 
                   1.6808E−02 
                   3.0708E−04 
                 −8.9048E−05 
               
               
                 A14= 
                   5.2062E−02 
                   2.2749E−02 
                 −4.6883E−03  
                 −3.6805E−03 
                 −3.6479E−05 
                   4.0997E−06 
               
               
                   
               
            
           
         
       
     
     In the 8th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 8th embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from TABLE 15 and TABLE 16 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 8th Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f (mm) 
                 6.37 
                 f/ImgH 
                 3.18 
               
               
                 Fno 
                 2.80 
                 f12/f3456 
                 −0.79 
               
               
                 HFOV (deg.) 
                 17.0 
                 Y11/Y62 
                 0.62 
               
               
                 V4 
                 23.3 
                 SAG62 + CT6 (mm) 
                 0.42 
               
               
                 Nmax 
                 1.640 
                 (ΣCT + ΣAT)/SD 
                 1.12 
               
               
                 CT6/T12 
                 11.44 
                 (ΣCT + ΣAT)/ΣCT 
                 1.91 
               
               
                 T56/CTmax 
                 1.59 
                 TL/f 
                 0.86 
               
               
                 f/R1 
                 4.37 
                 TL/ImgH 
                 2.73 
               
               
                   
               
            
           
         
       
     
     9th Embodiment 
       FIG.  17    is a schematic view of an imaging apparatus according to the 9th embodiment of the present disclosure.  FIG.  18    shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 9th embodiment. 
     In  FIG.  17   , the imaging apparatus includes the imaging optical lens assembly (its reference numeral is omitted) and an image sensor  990 . The imaging optical lens assembly includes, in order from an object side to an image side, a first lens element  910 , an aperture stop  900 , a second lens element  920 , a third lens element  930 , a fourth lens element  940 , a fifth lens element  950 , a sixth lens element  960 , an IR-cut filter  970  and an image surface  980 . The image sensor  990  is disposed on the image surface  980  of the imaging optical lens assembly. The imaging optical lens assembly has a total of six lens elements ( 910 - 960 ) with refractive power. Moreover, there is an air gap between any two of the first lens element  910 , the second lens element  920 , the third lens element  930 , the fourth lens element  940 , the fifth lens element  950 , and the sixth lens element  960  that are adjacent to each other and there is no relative movement among the lens elements ( 910 - 960 ) with refractive power. 
     The first lens element  910  with positive refractive power has a convex object-side surface  911  and a concave image-side surface  912 . The first lens element  910  is made of plastic material and has both the object-side surface  911  and the image-side surface  912  being aspheric. 
     The second lens element  920  with negative refractive power has a convex object-side surface  921  and a concave image-side surface  922 . The second lens element  920  is made of plastic material and has both the object-side surface  921  and the image-side surface  922  being aspheric. 
     The third lens element  930  with positive refractive power has a convex object-side surface  931  and a concave image-side surface  932 . The third lens element  930  is made of plastic material and has both the object-side surface  931  and the image-side surface  932  being aspheric. 
     The fourth lens element  940  with positive refractive power has a concave object-side surface  941  and a convex image-side surface  942 . The fourth lens element  940  is made of plastic material and has both the object-side surface  941  and the image-side surface  942  being aspheric. 
     The fifth lens element  950  with negative refractive power has a convex object-side surface  951  and a concave image-side surface  952 , The fifth lens element  950  is made of plastic material and has both the object-side surface  951  and the image-side surface  952  being aspheric. Furthermore, both of the object-side surface  951  and the image-side surface  952  of the fifth lens element  950  have at least one inflection point. The object-side surface  951  of the fifth lens element  950  changes from a convex shape to a concave shape from a paraxial region thereof to an off-axis region thereof. 
     The sixth lens element  960  with negative refractive power has a concave object-side surface  961  and a convex image-side surface  962 . The sixth lens element  960  is made of plastic material and has both the object-side surface  961  and the image-side surface  962  being aspheric. 
     The IR-cut filter  970  is made of glass material and located between the sixth lens element  960  and the image surface  980 , and will not affect the focal length of the imaging optical lens assembly. 
     Furthermore, in the imaging optical lens assembly of the imaging apparatus according to the 9th embodiment, when an Abbe number of the first lens element  910  is V1, an Abbe number of the second lens element  920  is V2, an Abbe number of the third lens element  930  is V3, an Abbe number of the fourth lens element  940  is V4, an Abbe number of the fifth lens element  950  is V5, and an Abbe number of the sixth lens element  960  is V6, two (V2=23.3 and V4=23.3) of V1, V2, V3, V4, V5 and V6 are smaller than 27. 
     In the imaging optical lens assembly of the imaging apparatus according to the 9th embodiment, when an axial distance between the first lens element  910  and the second lens element  920  is T 12 , an axial distance between the second lens element  920  and the third lens element  930  is T 23 , an axial distance between the third lens element  930  and the fourth lens element  940  is T 34 , an axial distance between the fourth lens element  940  and a fifth lens element  950  is T 45 , and the axial distance between the fifth lens element  950  and the sixth lens element  960  is T 56 , the following conditions are satisfied: 0&lt;T 12 &lt;T 23 &lt;T 56 ; 0&lt;T 12 &lt;T 34 &lt;T 56 ; 0&lt;T 45 &lt;T 23 &lt;T 56 ; and 0&lt;T 45 &lt;T 34 &lt;T 56 . 
     The detailed optical data of the 9th embodiment are shown in TABLE 17 and the aspheric surface data are shown in TABLE 18 below. 
     
       
         
           
               
             
               
                 TABLE 17 
               
             
            
               
                   
               
               
                 9th Embodiment 
               
               
                 f = 5.39 mm, Fno = 2.40, HFOV = 20.0 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 Surface  
                   
                   
                   
                   
                   
                   
                 Abbe  
                 Focal 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 # 
                   
                 Curvature Radius 
                 Thickness 
                 Material  
                 Index 
                 # 
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 1 
                 Lens 1 
                 1.573 
                 ASP 
                 0.701 
                 Plastic 
                 1.544 
                 55.9 
                 3.18 
               
               
                 2 
                   
                 14.442 
                 ASP 
                 0.030 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 3 
                 Ape. Stop 
                 Plano 
                 0.035 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 4 
                 Lens 2 
                 20.523 
                 ASP 
                 0.230 
                 Plastic 
                 1.640 
                 23.3 
                 −5.10 
               
               
                 5 
                   
                 2.801 
                 ASP 
                 0.205 
                   
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 4.656 
                 ASP 
                 0.627 
                 Plastic 
                 1.544 
                 55.9 
                 15.14 
               
               
                 7 
                   
                 10.200 
                 ASP 
                 0.369 
                   
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 −2.203 
                 ASP 
                 0.312 
                 Plastic 
                 1.640 
                 23.3 
                 26.29 
               
               
                 9 
                   
                 −2.056 
                 ASP 
                 0.020 
                   
                   
                   
                   
               
               
                 10 
                 Lens 5 
                 3.015 
                 ASP 
                 0.423 
                 Plastic 
                 1.544 
                 55.9 
                 −18.06 
               
               
                 11 
                   
                 2.193 
                 ASP 
                 1.342 
                   
                   
                   
                   
               
               
                 12 
                 Lens 6 
                 −3.362 
                 ASP 
                 0.335 
                 Plastic 
                 1.544 
                 55.9 
                 −8.36 
               
               
                 13 
                   
                 −13.323 
                 ASP 
                 0.300 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 14 
                 IR-cut filter 
                 Plano 
                 0.248 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 15 
                   
                 Plano 
                 0.284 
                   
                   
                   
                   
               
               
                 16 
                 Image 
                 Plano 
                 — 
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 18 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 Surface # 
                 1 
                 2 
                 4 
                 5 
                 6 
                 7 
               
               
                   
               
               
                 k= 
                   1.5938E−01 
                 −1.0000E+00  
                   5.0000E+01 
                 −1.7368E+01 
                 −1.0000E+00 
                 −1.7905E+01 
               
               
                 A4= 
                 −3.0064E−03 
                 −8.5161E−02  
                 −1.8340E−01 
                 −8.1730E−02 
                 −1.3796E−01 
                 −5.6314E−02 
               
               
                 A6= 
                 −1.1847E−02 
                   1.3785E−01 
                   3.5461E−01 
                   2.0355E−01 
                   2.2564E−02 
                 −5.6031E−02 
               
               
                 A8= 
                   4.3493E−02 
                 −5.1007E−02  
                 −2.9619E−01 
                 −2.0253E−01 
                 −3.6063E−02  
                   2.5376E−02 
               
               
                 A10= 
                 −8.7587E−02 
                 −1.6474E−01  
                 −3.0832E−03 
                   7.5013E−02 
                   3.9396E−02  
                   6.8390E−03 
               
               
                 A12= 
                   7.9586E−02 
                   1.8818E−01 
                   1.6181E−01 
                   4.1353E−02 
                 −1.5963E−02 
                 −1.9731E−02 
               
               
                 A14= 
                 −3.1141E−02 
                 −6.0328E−02  
                 −6.3255E−02 
                   4.8036E−03 
                   2.3924E−02  
                   7.9007E−03 
               
               
                   
               
               
                 Surface # 
                 8 
                 9 
                 10 
                 11 
                 12 
                 13 
               
               
                   
               
               
                 k= 
                 −5.7047E−02 
                   2.2861E−01 
                 −2.9176E+01 
                 −1.6780E+01 
                 −2.1700E+00 
                   4.7066E+01 
               
               
                 A4= 
                   2.0650E−01 
                   1.2002E−01 
                 −2.0159E−01 
                 −9.6619E−02 
                 −8.6852E−02  
                 −6.9360E−02 
               
               
                 A6= 
                 −4.3862E−01 
                 −1.7839E−01  
                   7.2189E−02 
                   1.5125E−02 
                   7.0946E−03 
                   6.9570E−03 
               
               
                 A8= 
                   4.4203E−01 
                   1.3955E−01 
                 −3.5580E−02 
                   2.5022E−02 
                 −5.4877E−03 
                 −2.7817E−03 
               
               
                 A10= 
                 −3.7871E−01 
                 −9.1401E−02 
                   2.6949E−02 
                 −1.5739E−02 
                   2.8245E−04 
                   4.0376E−04 
               
               
                 A12= 
                   1.2956E−01 
                   2.1203E−02 
                 −1.7776E−03 
                   6.5065E−03 
                   4.5206E−04  
                   6.1874E−05 
               
               
                 A14= 
                 −1.6345E−02 
                   4.2147E−04 
                 −8.0824E−03 
                 −1.4646E−03 
                   4.2584E−05  
                 −3.0979E−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 the following table are the same as those stated in the 1st embodiment with corresponding values for the 9th embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from TABLE 17 and TABLE 18 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 9th Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f (mm) 
                 5.39 
                 f/ImgH 
                 2.69 
               
               
                 Fno 
                 2.40 
                 f12/f3456 
                 −0.30 
               
               
                 HFOV (deg.) 
                 20.0 
                 Y11/Y62 
                 0.72 
               
               
                 V4 
                 23.3 
                 SAG62 + CT6 (mm) 
                 −0.24 
               
               
                 Nmax 
                 1.640 
                 (ΣCT + ΣAT)/SD 
                 1.19 
               
               
                 CT6/T12 
                 5.15 
                 (ΣCT + ΣAT)/ΣCT 
                 1.76 
               
               
                 T56/CTmax 
                 1.91 
                 TL/f 
                 1.01 
               
               
                 f/R1 
                 3.42 
                 TL/ImgH 
                 2.73 
               
               
                   
               
            
           
         
       
     
     10th Embodiment 
       FIG.  19    is a schematic view of an imaging apparatus according to the 10th embodiment of the present disclosure.  FIG.  20    shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the imaging apparatus according to the 10th embodiment. 
     In  FIG.  19   , the imaging apparatus includes the imaging optical lens assembly (its reference numeral is omitted) and an image sensor  1090 . The imaging optical lens assembly includes, in order from an object side to an Image side, an aperture stop  1000 , a first lens element  1010 , a second lens element  1020 , a third lens element  1030 , a fourth lens element  1040 , a fifth lens element  1050 , a sixth lens element  1060 , an IR-cut filter  1070  and an image surface  1080 . The image sensor  1090  is disposed on the image surface  1080  of the imaging optical lens assembly. The imaging optical lens assembly has a total of six lens elements ( 1010 - 1060 ) with refractive power. Moreover, there is an air gap between any two of the first lens element  1010 , the second lens element  1020 , the third lens element  1030 , the fourth lens element  1040 , the fifth lens element  1050 , and the sixth lens element  1060  that are adjacent to each other and there is no relative movement among the lens elements ( 1010 - 1060 ) with refractive power. 
     The first lens element  1010  with positive refractive power has a convex object-side surface  1011  and a convex image-side surface  1012 . The first lens element  1010  is made of plastic material and has both the object-side surface  1011  and the image-side surface  1012  being aspheric. 
     The second lens element  1020  with negative refractive power has a concave object-side surface  1021  and a concave image-side surface  1022 . The second lens element  1020  is made of plastic material and has both the object-side surface  1021  and the image-side surface  1022  being aspheric. 
     The third lens element  1030  with negative refractive power has a concave object-side surface  1031  and a convex image-side surface  1032 . The third lens element  1030  is made of plastic material and has both the object-side surface  1031  and the image-side surface  1032  being aspheric. 
     The fourth lens element  1040  with positive refractive power has a concave object-side surface  1041  and a convex image-side surface  1042 . The fourth lens element  1040  is made of plastic material and has both the object-side surface  1041  and the image-side surface  1042  being aspheric. 
     The fifth lens element  1050  with positive refractive power has a convex object-side surface  1051  and a concave image-side surface  1052 . The fifth lens element  1050  is made of plastic material and has both the object-side surface  1051  and the image-side surface  1052  being aspheric. Furthermore, both of the object-side surface  1051  and the image-side surface  1052  of the fifth lens element  1060  have at least one inflection point. The object-side surface  1051  of the fifth lens element  1050  changes from a convex shape to a concave shape from a paraxial region thereof to an off-axis region thereof. 
     The sixth lens element  1060  with negative refractive power has a concave object-side surface  1061  and a concave image-side surface  1062 . The sixth lens element  1060  is made of plastic material and has both the object-side surface  1061  and the image-side surface  1062  being aspheric. Furthermore, the image-side surface  1062  of the sixth lens element  1060  has at least one inflection point. 
     The IR-cut filter  1070  is made of glass material and located between the sixth lens element  1060  and the image surface  1080 , and will not affect the focal length of the imaging optical lens assembly. 
     Furthermore, in the imaging optical lens assembly of the imaging apparatus according to the 10th embodiment, when an Abbe number of the first lens element  1010  is V1, an Abbe number of the second lens element  1020  is V2, an Abbe number of the third lens element  1030  is V3, the Abbe number of the fourth lens element  1040  is V4, an Abbe number of the fifth lens element  1050  is V5, and an Abbe number of the sixth lens element  1060  is V6, three (V2=23.3, V4=23.3 and V6=23.3) of V1, V2, V3, V4, V5 and V6 are smaller than 27. 
     In the imaging optical lens assembly of the imaging apparatus according to the 10th embodiment, when an axial distance between the first lens element  1010  and the second lens element  1020  is T 12 , an axial distance between the second lens element  1020  and the third lens element  1030  is T 23 , an axial distance between the third lens element  1030  and the fourth lens element  1040  is T 34 , an axial distance between the fourth lens element  1040  and a fifth lens element  1050  is T 45 , and the axial distance between the fifth lens element  1050  and the sixth lens element  1060  is T 56 , the following conditions are satisfied: 0&lt;T 12 &lt;T 23 &lt;T 56 ; 0&lt;T 12 &lt;T 34 &lt;T 56 ; 0&lt;T 45 &lt;T 23 &lt;T 56 ; and 0&lt;T 45 &lt;T 34 &lt;T 56 . 
     The detailed optical data of the 10th embodiment are shown in TABLE 19 and the aspheric surface data are shown in TABLE 20 below. 
     
       
         
           
               
             
               
                 TABLE 19 
               
             
            
               
                   
               
               
                 10th Embodiment 
               
               
                 f = 4.85 mm, Fno = 2.40, HFOV = 22.0 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 Surface 
                   
                   
                   
                   
                   
                   
                 Abbe 
                 Focal 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 Index 
                 # 
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 Ape. Stop 
                 Plano 
                 −0.310 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 2 
                 Lens 1 
                 1.741 
                 ASP 
                 0.616 
                 Plastic 
                 1.544 
                 55.9 
                 2.99 
               
               
                 3 
                   
                 −22.162 
                 ASP 
                 0.094 
                   
                   
                   
                   
               
               
                 4 
                 Lens 2 
                 −30.338 
                 ASP 
                 0.245 
                 Plastic 
                 1.640 
                 23.3 
                 −6.25 
               
               
                 5 
                   
                 4.620 
                 ASP 
                 0.489 
                   
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 −9.153 
                 ASP 
                 0.470 
                 Plastic 
                 1.544 
                 55.9 
                 −89.68 
               
               
                 7 
                   
                 −11.470 
                 ASP 
                 0.701 
                   
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 −1.429 
                 ASP 
                 0.261 
                 Plastic 
                 1.640 
                 23.3 
                 134.16 
               
               
                 9 
                   
                 −1.506 
                 ASP 
                 0.020 
                   
                   
                   
                   
               
               
                 10 
                 Lens 5 
                 2.507 
                 ASP 
                 0.608 
                 Plastic 
                 1.544 
                 55.9 
                 10.39 
               
               
                 11 
                   
                 4.119 
                 ASP 
                 0.919 
                   
                   
                   
                   
               
               
                 12 
                 Lens 6 
                 −2.966 
                 ASP 
                 0.349 
                 Plastic 
                 1.640 
                 23.3 
                 −4.30 
               
               
                 13 
                   
                 40.023 
                 ASP 
                 0.250 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 14 
                 IR-cut filter 
                 Plano 
                 0.248 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 15 
                   
                 Plano 
                 0.196 
                   
                   
                   
                   
               
               
                 16 
                 Image 
                 Plano 
                 — 
                   
                   
                   
                   
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 20 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 Surface # 
                 2 
                 3 
                 4 
                 5 
                 6 
                 7 
               
               
                   
               
               
                 k= 
                   1.9874E−01 
                 −1.0000E+00  
                 −5.0000E+01 
                 −3.0729E+01  
                 −1.0000E+00  
                 −2.6703E+01 
               
               
                 A4= 
                   1.6992E−03 
                 −8.6921E−02 
                 −1.8580E−01  
                 −8.2305E−02  
                 −1.1346E−01 
                 −5.7516E−02 
               
               
                 A6= 
                 −8.6575E−03 
                   1.4011E−01 
                   3.6387E−01 
                   2.2441E−01  
                 −2.4580E−02 
                 −4.6890E−02 
               
               
                 A8= 
                   3.9198E−02 
                 −4.3001E−02  
                 −2.8759E−01  
                 −1.8975E−01  
                 −3.7457E−03 
                   9.3117E−03 
               
               
                 A10= 
                 −8.4097E−02 
                 −1.5868E−01 
                   5.5728E−03 
                   6.8894E−02 
                   3.7163E−02 
                   3.1640E−03 
               
               
                 A12= 
                   8.1967E−02 
                   1.9121E−01 
                   1.6116E−01 
                   3.7131E−02 
                 −7.5224E−02 
                 −4.5081E−03 
               
               
                 A14= 
                 −3.6456E−02 
                 −7.1793E−02  
                 −7.3135E−02 
                 −6.0985E−03 
                   5.3857E−02 
                   3.0069E−03 
               
               
                   
               
               
                 Surface # 
                 8 
                 9 
                 10 
                 11 
                 12 
                 13 
               
               
                   
               
               
                 k= 
                 −2.9843E+00  
                 −1.8604E−01  
                 −1.1315E+01 
                 −3.5618E+01 
                 −1.2753E+01 
                   5.0000E+01 
               
               
                 A4= 
                   2.4193E−01 
                   1.4465E−01 
                 −1.6690E−01 
                 −4.7542E−02  
                 −5.9500E−02 
                 −3.5320E−02 
               
               
                 A6= 
                 −4.8839E−01 
                   1.6127E−01 
                   1.1230E−01  
                 −2.4636E−03 
                   2.5898E−02 
                   9.7534E−03 
               
               
                 A8= 
                   4.7021E−01 
                   1.3110E−01 
                 −5.1886E−02 
                   2.8646E−02 
                 −2.4445E−03  
                 −1.9535E−03 
               
               
                 A10= 
                 −3.3811E−01  
                 −8.3386E−02 
                   1.1427E−02 
                 −1.9560E−02 
                 −3.5334E−04 
                   3.1454E−04 
               
               
                 A12= 
                   1.3801E−01 
                   3.1585E−02 
                 −1.8534E−03 
                   4.4047E−03 
                   9.1457E−05 
                 −7.1451E−05 
               
               
                 A14= 
                 −2.2905E−02 
                 −4.7021E−03  
                 −5.0761E−04 
                 −3.4496E−04 
                 −1.9867E−05 
                   4.4475E−06 
               
               
                   
               
            
           
         
       
     
     In the 10th embodiment, the equation of the aspheric surface profiles of the aforementioned lens elements is the same as the equation of the 1st embodiment. Also, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 10th embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from TABLE 19 and TABLE 20 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 10th Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f (mm) 
                 4.85 
                 f/ImgH 
                 2.43 
               
               
                 Fno 
                 2.40 
                 f12/f3456 
                 −0.53 
               
               
                 HFOV (deg.) 
                 22.0 
                 Y11/Y62 
                 0.58 
               
               
                 V4 
                 23.3 
                 SAG62 + CT6 (mm) 
                 0.20 
               
               
                 Nmax 
                 1.640 
                 (ΣCT + ΣAT)/SD 
                 1.07 
               
               
                 CT6/T12 
                 3.71 
                 (ΣCT + ΣAT)/ΣCT 
                 1.87 
               
               
                 T56/CTmax 
                 1.49 
                 TL/f 
                 1.13 
               
               
                 f/R1 
                 2.79 
                 TL/ImgH 
                 2.73 
               
               
                   
               
            
           
         
       
     
     11th Embodiment 
       FIG.  22    is a schematic view of an electronic device  10  according to the 11th embodiment of the present disclosure. The electronic device  10  of the 11th embodiment is a smart phone, wherein the electronic device  10  includes an imaging apparatus  11 . The imaging apparatus  11  includes an imaging optical lens assembly (its reference numeral is omitted) according to the present disclosure and an image sensor (its reference numeral is omitted), wherein the image sensor is disposed on an image surface of the imaging optical lens assembly. 
     12th Embodiment 
       FIG.  23    is a schematic view of an electronic device  20  according to the 12th embodiment of the present disclosure. The electronic device  20  of the 12th embodiment is a tablet personal computer, wherein the electronic device  20  includes an imaging apparatus  21 . The Imaging apparatus  21  includes an imaging optical lens assembly (its reference numeral is omitted) according to the present disclosure and an image sensor (its reference numeral is omitted), wherein the image sensor is disposed on an image surface of the imaging optical lens assembly. 
     13th Embodiment 
       FIG.  24    is a schematic view of an electronic device  30  according to the 13th embodiment of the present disclosure. The electronic device  30  of the 13th embodiment is a head-mounted display, wherein the electronic device  30  includes an imaging apparatus  31 . The imaging apparatus  31  includes an imaging optical lens assembly (its reference numeral is omitted) according to the present disclosure and an image sensor (its reference numeral is omitted), wherein the image sensor is disposed on an image surface of the imaging optical lens assembly. 
     The foregoing description, for purpose of explanation, has been described with reference to specific embodiments. It Is to be noted that TABLES 1-20 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.