Patent Publication Number: US-11042007-B2

Title: Imaging lens assembly, image capturing unit and electronic device

Description:
RELATED APPLICATIONS 
     This application is a continuation patent application of U.S. application Ser. No. 15/666,274, filed on Aug. 1, 2017, which is a continuation patent application of U.S. application Ser. No. 14/952,234, filed on Nov. 25, 2015, which claims priority to Taiwan Application 104134906, filed on Oct. 23, 2015, which is incorporated by reference herein in its entirety. 
    
    
     BACKGROUND 
     Technical Field 
     The present disclosure relates to an imaging lens assembly, an image capturing unit and an electronic device, more particularly to an imaging lens assembly and an image capturing unit applicable to an electronic device. 
     Description of Related Art 
     With increasing widespread use of camera modules, camera modules adopted in electronic devices with intelligent applications, such as smart automobile devices, and smart home devices has fast becoming a trend of future technology development. 
     Through the recognition capability of lens assemblies installed in these camera modules, smart devices with these camera modules are now able to accomplish tasks which were only possible by humans in the past, such as image recognition, driving assistance systems, and autonomous vehicles, etc. 
     Additionally, by adjusting the various parameters and configurations in lens designs, these specialized lens assemblies can adapt to different environmental settings in order to provide a wider variety of unique applications. Therefore, there is a need for imaging lens assemblies capable of satisfying the requirements for camera modules with a wide variety of applications. 
     SUMMARY 
     According to one aspect of the present disclosure, an imaging 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 has negative refractive power. The second lens element has positive refractive power. The third lens element has positive refractive power. The fourth lens element has positive refractive power. The fifth lens element has positive refractive power. The sixth lens element has negative refractive power. The imaging lens assembly has a total of six lens elements. When a ratio of a focal length of the imaging lens assembly to a focal length of the first lens element is P1, a ratio of the focal length of the imaging lens assembly to a focal length of the second lens element is P2, a ratio of the focal length of the imaging lens assembly to a focal length of the fifth lens element is P5, a ratio of the focal length of the imaging lens assembly to a focal length of the sixth lens element is P6, the following condition is satisfied:
 
(| P 1|+| P 2|)/(| P 5|+| P 6|)&lt;0.60
 
     According to another aspect of the present disclosure, an imaging 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 has negative refractive power. The second lens element has positive refractive power. The third lens element with positive refractive power has a concave image-side surface. The fourth lens element has positive refractive power. The fifth lens element with positive refractive power has a convex object-side surface and a convex image-side surface. The sixth lens element with negative refractive power has a concave image-side surface. The imaging lens assembly has a total of six lens elements. When a focal length of the imaging lens assembly is f, a curvature radius of the image-side surface of the sixth lens element is R12, the following condition is satisfied:
 
0&lt; f/R 12&lt;3.0.
 
     According to still another aspect of the present disclosure, an image capturing unit includes the aforementioned imaging lens assembly and an image sensor, wherein the image sensor is disposed on the image side of the imaging lens assembly. 
     According to yet still another aspect of the present disclosure, an electronic device includes the aforementioned image capturing unit. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The disclosure can be more 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 image capturing unit according to the 1st embodiment of the present disclosure; 
         FIG. 2  shows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 1st embodiment; 
         FIG. 3  is a schematic view of an image capturing unit according to the 2nd embodiment of the present disclosure; 
         FIG. 4  shows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 2nd embodiment; 
         FIG. 5  is a schematic view of an image capturing unit according to the 3rd embodiment of the present disclosure; 
         FIG. 6  shows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 3rd embodiment; 
         FIG. 7  is a schematic view of an image capturing unit according to the 4th embodiment of the present disclosure; 
         FIG. 8  shows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 4th embodiment; 
         FIG. 9  is a schematic view of an image capturing unit according to the 5th embodiment of the present disclosure; 
         FIG. 10  shows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 5th embodiment; 
         FIG. 11  is a schematic view of an image capturing unit according to the 6th embodiment of the present disclosure; 
         FIG. 12  shows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 6th embodiment; 
         FIG. 13  is a schematic view of an image capturing unit according to the 7th embodiment of the present disclosure; 
         FIG. 14  shows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 7th embodiment; 
         FIG. 15  is a schematic view of an image capturing unit according to the 8th embodiment of the present disclosure; 
         FIG. 16  shows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 8th embodiment; 
         FIG. 17  is a schematic view of an image capturing unit according to the 9th embodiment of the present disclosure; 
         FIG. 18  shows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 9th embodiment; 
         FIG. 19  is a schematic view of an image capturing unit according to the 10th embodiment of the present disclosure; 
         FIG. 20  shows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 10th embodiment; 
         FIG. 21  is a schematic view of an image capturing unit according to the 11th embodiment of the present disclosure; 
         FIG. 22  shows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 11th embodiment; 
         FIG. 23  is a schematic view of an image capturing unit according to the 12th embodiment of the present disclosure; 
         FIG. 24  shows spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 12th embodiment; 
         FIG. 25  shows an electronic device according to one embodiment; 
         FIG. 26  shows an electronic device according to another embodiment; and 
         FIG. 27  shows an electronic device according to still another embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     An imaging 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, the second lens element, the third lens element and the fourth lens element can be single and non-cemented lens elements. The fifth lens element and the sixth lens element can be cemented lens elements. The non-cemented lens element has the advantage of a simpler manufacturing process, and the cemented lens element is favorable for correcting aberrations. 
     The first lens element has negative refractive power. Therefore, it is favorable for enlarging the scope of the incident light beams so as to increase the aperture, and thereby providing sufficient amount of incident light. 
     The second lens element has positive refractive power. Therefore, it is favorable for balancing the divergence capability of the first lens element so as to correct aberrations generated from the first lens element. 
     The third lens element with positive refractive power can have a concave image-side surface. Therefore, it is favorable for reducing a total track length of the imaging lens assembly. 
     The fourth lens element has positive refractive power. Therefore, the arrangement of the refractive power of the third lens element and the fourth lens element is favorable for improving the convergence capability of the imaging lens assembly and balancing the refractive power distribution between the object side and the image side so as to correct aberrations of the imaging lens assembly. Furthermore, the fourth lens element can have a concave object-side surface and a convex image-side surface. Therefore, it is favorable for correcting aberrations of the off-axial region so as to reduce the difference of the focus positions due to different curvatures of the tangential plane and the sagittal plane. 
     The fifth lens element with positive refractive power can have a convex object-side surface and a convex image-side surface. Therefore, the arrangement of the second lens element and the fifth lens element, which is symmetrical within the structure of the imaging lens assembly, is favorable for enhancing the image quality. 
     The sixth lens element with negative refractive power can have a concave image-side surface. Therefore, it is favorable for correcting chromatic aberration so as to reduce the difference of the positions where different wavelengths of light are focused. 
     When a ratio of a focal length of the imaging lens assembly to a focal length of the first lens element is P1, a ratio of the focal length of the imaging lens assembly to a focal length of the second lens element is P2, a ratio of the focal length of the imaging lens assembly to a focal length of the fifth lens element is P5, a ratio of the focal length of the imaging lens assembly to a focal length of the sixth lens element is P6, the following condition is satisfied: (|P1|+|P2|)/(|P5|+|P6|)&lt;0.60. Therefore, it is favorable for enlarging the aperture so as to increase the amount of incident light. Moreover, it is favorable for reducing a back focal length of the imaging lens assembly so as to maintain a compact size thereof. According to the disclosure, a ratio of the focal length of the imaging lens assembly to a focal length of a lens element is the refractive power of the lens element. 
     When the focal length of the imaging lens assembly is f, a curvature radius of the image-side surface of the sixth lens element is R12, the following condition is satisfied: 0&lt;f/R12&lt;3.0. Therefore, it is favorable for further reducing the back focal length so as to keep the imaging lens assembly compact. 
     When an Abbe number of the sixth lens element is V6, the following condition can be satisfied: V6&lt;30. Therefore, it is favorable for the imaging lens assembly having sufficient chromatic aberration correction capability at the image side so as to provide proper imaging range, and thereby the imaging lens assembly is favorably applicable to image recognition applications. 
     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, an 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 i-th lens element is Vi, the following condition can be satisfied: 30&lt;Vi, wherein i=1, 2, 3, 4, 5. Therefore, it is favorable for arranging the distribution of the refractive indices of the lens elements in the imaging lens assembly so as to prevent undesirable aberrations. 
     When the focal length of the imaging lens assembly is f, the following condition can be satisfied: 5.0 millimeters&lt;f&lt;15.0 millimeters. Therefore, it is favorable for keeping the imaging lens assembly compact. 
     According to the disclosure, the imaging lens assembly further includes an aperture stop, and the lens elements of the imaging lens assembly can include a front lens group and a rear lens group. The front lens group is located between an imaged object and the aperture stop, and the rear lens group is located between the aperture stop and an image surface. When a focal length of the front lens group is ff, a focal length of the rear lens group is fr, the following condition can be satisfied: −0.50&lt;fr/ff&lt;0.50. Therefore, it is favorable for balancing the refractive power distribution of the imaging lens assembly so as to reduce the total track length. According to the disclosure, both the front lens group and the rear lens group may include only one lens element or plural lens elements. When the front/rear lens group includes only one lens element, the focal length of the front/rear lens group is equal to a focal length of the lens element. When the front/rear lens group includes plural lens elements, the focal length of the front/rear lens group is equal to a composite focal length of the lens elements. 
     When the focal length of the imaging lens assembly is f, an entrance pupil diameter of the imaging lens assembly is EPD, the following condition can be satisfied: f/EPD&lt;1.85. Therefore, it is favorable for arranging the aperture so as to provide sufficient amount of incident light, and thereby improving the image quality. 
     When an axial distance between an object-side surface of the first lens element and the image-side surface of the sixth lens element is Td, a maximum image height of the imaging lens assembly (half of a diagonal length of an effective photosensitive area of the image sensor) is ImgH, the following condition can be satisfied: 4.0&lt;Td/ImgH&lt;8.0. Therefore, it is favorable for tightly arranging the lens elements of the imaging lens assembly so as to maintain a compact size thereof. 
     When a curvature radius of an object-side surface of the third lens element is R5, a curvature radius of the image-side surface of the third lens element is R6, the following condition can be satisfied: −0.80&lt;(R5−R6)/(R5+R6)&lt;0.10. Therefore, it is favorable for correcting spherical aberration so as to improve the image quality. 
     When a curvature radius of the object-side surface of the fifth lens element is R9, a curvature radius of the image-side surface of the fifth lens element is R10, a curvature radius of an object-side surface of the sixth lens element is R11, the curvature radius of the image-side surface of the sixth lens element is R12, the following condition can be satisfied: −0.50&lt;((R9+R10)/(R9−R10))+((R11+R12)/(R11−R12))&lt;0.50. Therefore, the shapes of the lens elements at the image side of the imaging lens assembly are symmetric so that it is favorable for correcting coma and astigmatism. 
     When an axial distance between the first lens element and the second lens element is T12, an axial distance between the third lens element and the fourth lens element is T34, the following condition can be satisfied: 0.10&lt;T12/T34&lt;1.5. Therefore, the axial distances between adjacent lens elements are properly arranged so that it is favorable for obtaining compactness and assembling the image lens assembly. 
     When the entrance pupil diameter of the imaging lens assembly is EPD, the maximum image height of the imaging lens assembly is ImgH, the following condition can be satisfied: 0.65&lt;EPD/ImgH&lt;3.0. Therefore, when the imaging lens assembly has a sufficient photosensitive area, it is favorable for per unit of the photosensitive area receiving more light so as to increase the image illumination and resolution. 
     When half of a maximal field of view of the imaging lens assembly is HFOV, the following condition can be satisfied: 0.40&lt;tan(2*HFOV)&lt;1.0. Therefore, it is favorable for obtaining a proper field of view so that the imaging lens assembly is applicable to image recognition functionality on various devices. 
     When a sum of central thicknesses of all the lens elements of the imaging lens assembly (That is, a sum of the 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, the axial distance between the object-side surface of the first lens element and the image-side surface of the sixth lens element is Td, the following condition can be satisfied: 0.60&lt;ΣCT/Td&lt;1.0. Therefore, it is favorable for assembling the lens elements with a proper arrangement so as to increase the manufacturing yield rate and keep the imaging lens assembly compact. 
     When a refractive index of the first lens element is N1, a refractive index of the second lens element is N2, a maximum refractive index among all the lens elements of the imaging lens assembly (That is, a maximum refractive index among 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 Nmax, the following conditions can be satisfied: N1&lt;N2 and 1.7&lt;Nmax. Therefore, it is favorable for properly distributing the refractive indices of the lens elements while choosing a proper material for each lens element. 
     When a maximum effective radius of the object-side surface of the first lens element is Y11, a maximum effective radius of the image-side surface of the sixth lens element is Y62, the following condition can be satisfied: 0.80&lt;Y11/Y62&lt;1.55. Therefore, it is favorable for controlling the size difference between an entrance opening and an exit opening of the imaging lens assembly so as to increase the amount of incident light and provide the proper image size. 
     When an axial distance between the object-side surface of the first lens element and the image surface is TL, the focal length of the imaging lens assembly is f, the following condition can be satisfied: 1.8&lt;TL/f&lt;7.0. Therefore, it is favorable for balancing the configuration of the imaging lens assembly with a sufficient imaging range and incident light so as to obtain higher image quality. 
     When the central thickness of the first lens element is CT1, the central thickness of the second lens element is CT2, the central thickness of the third lens element is CT3, the central thickness of the fourth lens element is CT4, the central thickness of the fifth lens element is CT5, the central thickness of the sixth lens element is CT6, the following condition can be satisfied: 0.65&lt;(CT5+CT6)/(CT1+CT2+CT3+CT4). Therefore, it is favorable for properly arranging the thicknesses of the fifth lens element and the sixth lens element so as to correct high-order aberrations, and thereby improving the image quality. 
     According to 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 produce a telecentric effect by providing a longer distance between an exit pupil and the image surface, thereby improving the image-sensing efficiency of an image sensor (for example, CCD or CMOS). A middle stop disposed between the first lens element and the image surface is favorable for enlarging the view angle and thereby provides a wider field of view. 
     According to the present disclosure, the lens elements of the imaging lens assembly can be made of glass or plastic material. When the lens elements are made of glass material, the refractive power distribution of the imaging lens assembly may be more flexible to design. When the lens elements are made of plastic material, manufacturing costs can be effectively reduced. Furthermore, surfaces of each lens element can be arranged to be aspheric, since the aspheric surface of the lens element is easy to form a shape other than a spherical surface so as to have more controllable variables for eliminating aberrations thereof and to further decrease the required number of the lens elements. Therefore, the total track length of the imaging lens assembly can also be reduced. 
     According to the present disclosure, each of an object-side surface and an image-side surface has a paraxial region and an off-axial region. The paraxial region refers to the region of the surface where light rays travel close to the optical axis, and the off-axial region refers to the region of the surface away from the paraxial region. Particularly unless otherwise stated, when the lens element has a convex surface, it indicates that the surface can be convex in the paraxial region thereof; when the lens element has a concave surface, it indicates that the surface can be concave in the paraxial region thereof. Moreover, when a region of refractive power or focus of a lens element is not defined, it indicates that the region of refractive power or focus of the lens element can be in the paraxial region thereof. 
     According to the present disclosure, an image surface of the imaging lens assembly, based on the corresponding image sensor, can be flat or curved, particularly a concave curved surface facing towards the object side of the imaging lens assembly. 
     According to the present disclosure, the imaging lens assembly can include at least one stop, such as an aperture stop, a glare stop or a field stop. Said glare stop or said field stop is allocated for eliminating the stray light and thereby improving the image quality thereof. 
     According to the present disclosure, an image capturing unit is provided. The image capturing unit includes the imaging lens assembly according to the aforementioned imaging lens assembly of the present disclosure, and an image sensor, wherein the image sensor is disposed on the image side of the aforementioned imaging lens assembly, that is, the image sensor can be disposed on or near an image surface of the aforementioned imaging lens assembly. In some embodiments, the image capturing unit can further include a barrel member, a holding member or a combination thereof. 
     In  FIG. 25 ,  FIG. 26 , and  FIG. 27 , an image capturing unit  10  may be installed in, but not limited to, an electronic device, including a vehicle backup camera ( FIG. 25 ), a dashboard camera ( FIG. 26 ) or a surveillance device ( FIG. 27 ). The electronic devices shown in the figures are only exemplary for showing the image capturing unit of the present disclosure installed in an electronic device and are not limited thereto. In some embodiments, the electronic device can further include, but not limited to, a display unit, a control unit, a storage unit, a random access memory unit (RAM), a read only memory unit (ROM) or a combination thereof. 
     According to the present disclosure, the imaging lens assembly can be optionally applied to optical systems with a movable focus. Furthermore, the imaging lens assembly is featured with good capability in aberration corrections 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, wearable devices, smart televisions, network surveillance devices, motion sensing input devices, dashboard cameras, vehicle backup cameras and other electronic imaging devices. Moreover, the imaging lens assembly also can be applied to driving assistance, in products such as lane departure warning system (LDWS), autonomous vehicle and other image recognition devices. According to the above description of the present disclosure, the following specific embodiments are provided for further explanation. 
     1st Embodiment 
       FIG. 1  is a schematic view of an image capturing unit 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 image capturing unit according to the 1st embodiment. In  FIG. 1 , the image capturing unit includes the imaging lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor  190 . The imaging lens assembly includes, in order from an object side to an image side, a first lens element  110 , a second lens element  120 , an aperture stop  100 , 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 , a cover glass  175  and an image surface  180 , wherein the imaging lens assembly has a total of six lens elements ( 110 - 160 ). The first lens element  110 , the second lens element  120 , the third lens element  130  and the fourth lens element  140  are single and non-cemented lens elements. The fifth lens element  150  and the sixth lens element  160  are cemented lens elements. 
     The first lens element  110  with negative refractive power has a convex object-side surface  111  and a concave image-side surface  112 . The first lens element  110  is made of glass material and has the object-side surface  111  and the image-side surface  112  being both aspheric. 
     The second lens element  120  with positive refractive power has a convex object-side surface  121  and a concave image-side surface  122 . The second lens element  120  is made of glass material and has the object-side surface  121  and the image-side surface  122  being both spherical. 
     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 glass material and has the object-side surface  131  and the image-side surface  132  being both spherical. 
     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 glass material and has the object-side surface  141  and the image-side surface  142  being both spherical. 
     The fifth lens element  150  with positive refractive power has a convex object-side surface  151  and a convex image-side surface  152 . The fifth lens element  150  is made of glass material and has the object-side surface  151  and the image-side surface  152  being both spherical. 
     The sixth lens element  160  with negative refractive power has a concave object-side surface  161  and a concave image-side surface  162 . The sixth lens element  160  is made of glass material and has the object-side surface  161  and the image-side surface  162  being both spherical. 
     The IR-cut filter  170  and the cover glass  175  are 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 lens assembly. The image sensor  190  is disposed on or near the image surface  180  of the imaging 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   +     sqrt   ⁡     (     1   -       (     1   +   k     )     ×       (     Y   /   R     )     2         )         )       +       ∑   i     ⁢       (   Ai   )     ×     (     Y   i     )             ,         
where,
 
     X is the relative distance between a point on the aspheric surface spaced at a distance Y from an 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, and in the embodiments, i may be, but is not limited to, 4, 6, 8, 10, 12, 14 and 16. 
     In the imaging lens assembly of the image capturing unit according to the 1st embodiment, when a focal length of the imaging lens assembly is f, an f-number of the imaging lens assembly is Fno, and half of a maximal field of view of the imaging lens assembly is HFOV, these parameters have the following values: f=8.74 millimeters (mm); Fno=1.50; and HFOV=19.7 degrees (deg.). 
     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, an Abbe number of the fourth lens element  140  is V4, an Abbe number of the fifth lens element  150  is V5, an Abbe number of the sixth lens element  160  is V6, the following conditions are satisfied: V1=38.0; V2=42.2; V3=46.6; V4=52.3; V5=40.9; and V6=23.8. 
     When a maximum refractive index among all the lens elements ( 110 - 160 ) of the imaging lens assembly is Nmax, the following condition is satisfied: Nmax=1.847. In this embodiment, the refractive index of the sixth lens element  160  is the largest among the refractive indices of the lens elements ( 110 - 160 ) of the imaging lens assembly, and therefore is equal to Nmax. 
     When an axial distance between the first lens element  110  and the second lens element  120  is T12, an axial distance between the third lens element  130  and the fourth lens element  140  is T34, the following condition is satisfied: T12/T34=0.34. 
     When a central thickness of the first lens element  110  is CT1, a central thickness of the second lens element  120  is CT2, a central thickness of the third lens element  130  is CT3, a central thickness of the fourth lens element  140  is CT4, a central thickness of the fifth lens element  150  is CT5, a central thickness of the sixth lens element  160  is CT6, the following condition is satisfied: (CT5+CT6)/(CT1+CT2+CT3+CT4)=1.18. 
     When a curvature radius of the object-side surface  131  of the third lens element  130  is R5, a curvature radius of the image-side surface  132  of the third lens element  130  is R6, the following condition is satisfied: (R5−R6)/(R5+R6)=0.02. 
     When the focal length of the imaging lens assembly is f, a curvature radius of the image-side surface  162  of the sixth lens element  160  is R12, the following condition is satisfied: f/R12=0.94. 
     When a curvature radius of the object-side surface  151  of the fifth lens element  150  is R9, a curvature radius of the image-side surface  152  of the fifth lens element  150  is R10, a curvature radius of the object-side surface  161  of the sixth lens element  160  is R11, the curvature radius of the image-side surface  162  of the sixth lens element  160  is R12, the following condition is satisfied: ((R9+R10)/(R9−R10))+((R11+R12)/(R11−R12))=0.06. 
     When a ratio of the focal length of the imaging lens assembly to a focal length of the first lens element  110  (the refractive power of the first lens element  110 ) is P1, a ratio of the focal length of the imaging lens assembly to a focal length of the second lens element  120  (the refractive power of the second lens element  120 ) is P2, a ratio of the focal length of the imaging lens assembly to a focal length of the fifth lens element  150  (the refractive power of the fifth lens element  150 ) is P5, a ratio of the focal length of the imaging lens assembly to a focal length of the sixth lens element  160  (the refractive power of the sixth lens element  160 ) is P6, the following condition is satisfied: (|P1|+|P2|)/(|P5|+|P6|)=0.32. 
     When a maximum effective radius of the object-side surface  111  of the first lens element  110  is Y11, a maximum effective radius of the image-side surface  162  of the sixth lens element  160  is Y62, the following condition is satisfied: Y11/Y62=1.38. 
     When the focal length of the imaging lens assembly is f, an entrance pupil diameter of the imaging lens assembly is EPD, the following condition is satisfied: f/EPD=1.50. 
     The first lens element  110  and the second lens element  120  which are located between an imaged object and the aperture stop  100  are a front lens group of the imaging lens assembly. The third lens element  130 , the fourth lens element  140 , the fifth lens element  150  and the sixth lens element  160  which are located between the aperture stop  100  and the image surface  180  are a rear lens group of the imaging lens assembly. When a focal length of front lens group is ff, a focal length of the rear lens group is fr, the following condition is satisfied: fr/ff=−0.16. In this embodiment, ff is equal to a composite focal length of the first lens element  110  and the second lens element  120 , and fr is equal to 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 . 
     When an axial distance between the object-side surface  111  of the first lens element  110  and the image surface  180  is TL, the focal length of the imaging lens assembly is f, the following condition is satisfied: TL/f=2.40. 
     When a sum of the central thicknesses of all the lens elements ( 110 - 160 ) of the imaging lens assembly is ΣCT, an axial distance between the object-side surface  111  of the first lens element  110  and the image-side surface  162  of the sixth lens element  160  is Td, the following condition is satisfied: ΣCT/Td=0.83. 
     When the axial distance between the object-side surface  111  of the first lens element  110  and the image-side surface  162  of the sixth lens element  160  is Td, a maximum image height of the imaging lens assembly is ImgH, the following condition is satisfied: Td/ImgH=6.01. 
     When the entrance pupil diameter of the imaging lens assembly is EPD, the maximum image height of the imaging lens assembly is ImgH, the following condition is satisfied: EPD/ImgH=1.94. 
     When half of the maximal field of view of the imaging lens assembly is HFOV, the following condition is satisfied: tan(2*HFOV)=0.82. 
     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 = 8.74 mm, Fno = 1.50, HFOV = 19.7 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Sur- 
                   
                   
                   
                   
                   
                   
                   
               
               
                 face  
                   
                 Curvature  
                 Thick- 
                 Mate- 
                   
                 Abbe  
                 Focal  
               
               
                 #  
                   
                 Radius  
                 ness  
                 rial  
                 Index  
                 #  
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 1 
                 Lens 1 
                 163.934 
                 (ASP) 
                 0.750 
                 Glass 
                 1.603 
                 38.0 
                 −11.88 
               
               
                 2 
                   
                 6.857 
                 (ASP) 
                 0.379 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 3 
                 Lens 2 
                 8.582 
                 1.843 
                 Glass 
                 1.800 
                 42.2 
                 15.55 
               
               
                 4 
                   
                 25.051 
                 1.895 
                   
                   
                   
                   
               
               
                 5 
                 Ape.  
                 Plano 
                 −0.392 
                   
                   
                   
                   
               
               
                   
                 Stop  
                   
                   
                   
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 7.635 
                 2.346 
                 Glass 
                 1.816 
                 46.6 
                 91.00 
               
               
                 7 
                   
                 7.335 
                 1.115 
                   
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 −87.675 
                 1.899 
                 Glass 
                 1.755 
                 52.3 
                 11.08 
               
               
                 9 
                   
                 −7.707 
                 0.100 
                   
                   
                   
                   
               
               
                 10 
                 Lens 5 
                 10.574 
                 4.279 
                 Glass 
                 1.806 
                 40.9 
                 5.09 
               
               
                 11 
                   
                 −5.501 
                 0.010 
                 Cement 
                 1.514 
                 38.8 
                   
               
               
                 12 
                 Lens 6 
                 −5.499 
                 3.800 
                 Glass 
                 1.847 
                 23.8 
                 −3.65 
               
               
                 13 
                   
                 9.274 
                 1.000 
                   
                   
                   
                   
               
               
                 14 
                 IR-cut 
                 Plano 
                 0.300 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                   
                 filter 
                   
                   
                   
                   
                   
                   
               
               
                 15 
                   
                 Plano 
                 0.300 
                   
                   
                   
                   
               
               
                 16 
                 Cover 
                 Plano 
                 0.400 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                   
                 glass 
                   
                   
                   
                   
                   
                   
               
               
                 17 
                   
                 Plano 
                 0.979 
                   
                   
                   
                   
               
               
                 18 
                 Image 
                 Plano 
                 — 
                   
                   
                   
                   
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 2 
               
             
            
               
                   
               
               
                 Aspheric Coefficients 
               
            
           
           
               
               
               
               
            
               
                   
                 Surface # 
                 1 
                 2 
               
               
                   
               
               
                   
                 k = 
                  2.5000E+01 
                 3.7464E−01 
               
               
                   
                 A4 = 
                 −9.6626E−05 
                 3.2339E−04 
               
               
                   
                 A6 = 
                 −2.1707E−05 
                 −1.9065E−05  
               
               
                   
               
            
           
         
       
     
     In Table 1, the curvature radius, the thickness and the focal length are shown in millimeters (mm). Surface numbers 0-18 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-A6 represent the aspheric coefficients ranging from the 4th order to the 6th 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 image capturing unit 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 image capturing unit according to the 2nd embodiment. In  FIG. 3 , the image capturing unit includes the imaging lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor  290 . The imaging lens assembly includes, in order from an object side to an image side, a first lens element  210 , a second lens element  220 , an aperture stop  200 , a third lens element  230 , a fourth lens element  240 , a fifth lens element  250 , a sixth lens element  260 , an IR-cut filter  270 , a cover glass  275  and an image surface  280 , wherein the imaging lens assembly has a total of six lens elements ( 210 - 260 ). The first lens element  210 , the second lens element  220 , the third lens element  230  and the fourth lens element  240  are single and non-cemented lens elements. The fifth lens element  250  and the sixth lens element  260  are cemented lens elements. 
     The first lens element  210  with negative refractive power has a concave object-side surface  211  and a convex image-side surface  212 . The first lens element  210  is made of glass material and has the object-side surface  211  and the image-side surface  212  being both spherical. 
     The second lens element  220  with positive refractive power has a convex object-side surface  221  and a convex image-side surface  222 . The second lens element  220  is made of glass material and has the object-side surface  221  and the image-side surface  222  being both spherical. 
     The third lens element  230  with positive refractive power has a concave object-side surface  231  and a convex image-side surface  232 . The third lens element  230  is made of glass material and has the object-side surface  231  and the image-side surface  232  being both aspheric. 
     The fourth lens element  240  with positive refractive power has a convex object-side surface  241  and a convex image-side surface  242 . The fourth lens element  240  is made of glass material and has the object-side surface  241  and the image-side surface  242  being both spherical. 
     The fifth lens element  250  with positive refractive power has a convex object-side surface  251  and a convex image-side surface  252 . The fifth lens element  250  is made of glass material and has the object-side surface  251  and the image-side surface  252  being both spherical. 
     The sixth lens element  260  with negative refractive power has a concave object-side surface  261  and a concave image-side surface  262 . The sixth lens element  260  is made of glass material and has the object-side surface  261  and the image-side surface  262  being both spherical. 
     The IR-cut filter  270  and the cover glass  275  are 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 lens assembly. The image sensor  290  is disposed on or near the image surface  280  of the imaging lens assembly. 
     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 = 8.58 mm, Fno = 1.70, HFOV = 20.2 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Sur- 
                   
                   
                   
                   
                   
                   
                   
               
               
                 face  
                   
                 Curvature  
                 Thick- 
                 Mate- 
                   
                 Abbe  
                 Focal  
               
               
                 #  
                   
                 Radius  
                 ness  
                 rial  
                 Index  
                 #  
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 Lens 1 
                 −6.842 
                 0.750 
                 Glass 
                 1.603 
                 38.0 
                 −17.65 
               
               
                 2 
                   
                 −19.922 
                 0.100 
                   
                   
                   
                   
               
               
                 3 
                 Lens 2 
                 13.634 
                 1.429 
                 Glass 
                 1.800 
                 42.2 
                 12.77 
               
               
                 4 
                   
                 −38.766 
                 0.198 
                   
                   
                   
                   
               
               
                 5 
                 Ape.  
                 Plano 
                 0.615 
                   
                   
                   
                   
               
               
                   
                 Stop  
                   
                   
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 6 
                 Lens 3 
                 −12.943 
                 (ASP) 
                 5.000 
                 Glass 
                 1.847 
                 23.8 
                 56.94 
               
               
                 7 
                   
                 −12.011 
                 (ASP) 
                 0.200 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 8 
                 Lens 4 
                 21.398 
                 1.653 
                 Glass 
                 1.741 
                 52.6 
                 18.34 
               
               
                 9 
                   
                 −36.036 
                 0.100 
                   
                   
                   
                   
               
               
                 10 
                 Lens 5 
                 12.976 
                 3.529 
                 Glass 
                 1.806 
                 40.9 
                 5.24 
               
               
                 11 
                   
                 −5.501 
                 0.010 
                 Cement 
                 1.514 
                 38.8 
                   
               
               
                 12 
                 Lens 6 
                 −5.499 
                 3.800 
                 Glass 
                 1.847 
                 23.8 
                 −3.36 
               
               
                 13 
                   
                 7.779 
                 1.000 
                   
                   
                   
                   
               
               
                 14 
                 IR-cut 
                 Plano 
                 0.300 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                   
                 filter 
                   
                   
                   
                   
                   
                   
               
               
                 15 
                   
                 Plano 
                 0.300 
                   
                   
                   
                   
               
               
                 16 
                 Cover 
                 Plano 
                 0.400 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                   
                 glass 
                   
                   
                   
                   
                   
                   
               
               
                 17 
                   
                 Plano 
                 1.579 
                   
                   
                   
                   
               
               
                 18 
                 Image 
                 Plano 
                 — 
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 4 
               
             
            
               
                   
               
               
                 Aspheric Coefficients 
               
            
           
           
               
               
               
               
            
               
                   
                 Surface # 
                 6 
                 7 
               
               
                   
               
               
                   
                 k = 
                 1.0004E+00 
                 −1.7157E+00 
               
               
                   
               
            
           
         
       
     
     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] 
                 8.58 
                 (CT5 + CT6)/(CT1 + CT2 + CT3 + CT4) 
                 0.83 
               
               
                 Fno 
                 1.70 
                 (R5 − R6)/(R5 + R6) 
                 0.04 
               
               
                 HFOV 
                 20.2 
                 ((R9 + R10)/(R9 − R10)) + ((R11 + R12)/ 
                 0.23 
               
               
                 [deg.] 
                   
                 (R11 − R12)) 
                   
               
               
                 V1 
                 38.0 
                 (|P1| + |P2|)/(|P5| + |P6|) 
                 0.28 
               
               
                 V2 
                 42.2 
                 Y11/Y62 
                 1.08 
               
               
                 V3 
                 23.8 
                 f/EPD 
                 1.70 
               
               
                 V4 
                 52.6 
                 fr/ff 
                 0.30 
               
               
                 V5 
                 40.9 
                 TL/f 
                 2.44 
               
               
                 V6 
                 23.8 
                 ΣCT/Td 
                 0.93 
               
               
                 Nmax 
                 1.847 
                 Td/ImgH 
                 5.79 
               
               
                 T12/T34 
                 0.50 
                 EPD/ImgH 
                 1.68 
               
               
                 f/R12 
                 1.10 
                 tan(2*HFOV) 
                 0.85 
               
               
                   
               
            
           
         
       
     
     3rd Embodiment 
       FIG. 5  is a schematic view of an image capturing unit 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 image capturing unit according to the 3rd embodiment. In  FIG. 5 , the image capturing unit includes the imaging lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor  390 . The imaging lens assembly includes, in order from an object side to an image side, a first lens element  310 , a second lens element  320 , an aperture stop  300 , 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 , a cover glass  375  and an image surface  380 , wherein the imaging lens assembly has a total of six lens elements ( 310 - 360 ). The first lens element  310 , the second lens element  320 , the third lens element  330  and the fourth lens element  340  are single and non-cemented lens elements. The fifth lens element  350  and the sixth lens element  360  are cemented lens elements. 
     The first lens element  310  with negative refractive power has a convex object-side surface  311  and a concave image-side surface  312 . The first lens element  310  is made of glass material and has the object-side surface  311  and the image-side surface  312  being both spherical. 
     The second lens element  320  with positive refractive power has a convex object-side surface  321  and a concave image-side surface  322 . The second lens element  320  is made of glass material and has the object-side surface  321  and the image-side surface  322  being both spherical. 
     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 glass material and has the object-side surface  331  and the image-side surface  332  being both aspheric. 
     The fourth lens element  340  with positive refractive power has a concave object-side surface  341  and a convex image-side surface  342 . The fourth lens element  340  is made of glass material and has the object-side surface  341  and the image-side surface  342  being both spherical. 
     The fifth lens element  350  with positive refractive power has a convex object-side surface  351  and a convex image-side surface  352 . The fifth lens element  350  is made of glass material and has the object-side surface  351  and the image-side surface  352  being both spherical. 
     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 glass material and has the object-side surface  361  and the image-side surface  362  being both spherical. 
     The IR-cut filter  370  and the cover glass  375  are 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 lens assembly. The image sensor  390  is disposed on or near the image surface  380  of the imaging lens assembly. 
     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 = 8.59 mm, Fno = 1.65, HFOV = 19.8 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Sur- 
                   
                   
                   
                   
                   
                   
                   
               
               
                 face  
                   
                 Curvature  
                 Thick- 
                 Mate- 
                   
                 Abbe  
                 Focal  
               
               
                 #  
                   
                 Radius  
                 ness  
                 rial  
                 Index  
                 #  
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 Lens 1 
                 9.862 
                 2.799 
                 Glass 
                 1.603 
                 38.0 
                 −19.79 
               
               
                 2 
                   
                 4.824 
                 0.495 
                   
                   
                   
                   
               
               
                 3 
                 Lens 2 
                 7.481 
                 2.042 
                 Glass 
                 1.804 
                 46.6 
                 16.03 
               
               
                 4 
                   
                 15.665 
                 0.481 
                   
                   
                   
                   
               
               
                 5 
                 Ape.  
                 Plano 
                 −0.216 
                   
                   
                   
                   
               
               
                   
                 Stop  
                   
                   
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 6 
                 Lens 3 
                 8.548 
                 (ASP) 
                 1.823 
                 Glass 
                 1.804 
                 46.6 
                 163.00 
               
               
                 7 
                   
                 8.276 
                 (ASP) 
                 0.816 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 8 
                 Lens 4 
                 −9.085 
                 2.994 
                 Glass 
                 1.741 
                 52.6 
                 12.47 
               
               
                 9 
                   
                 −5.223 
                 0.100 
                   
                   
                   
                   
               
               
                 10 
                 Lens 5 
                 8.829 
                 2.866 
                 Glass 
                 1.804 
                 46.6 
                 5.88 
               
               
                 11 
                   
                 −8.718 
                 0.100 
                 Cement 
                 1.514 
                 38.8 
                   
               
               
                 12 
                 Lens 6 
                 −7.971 
                 3.800 
                 Glass 
                 1.847 
                 23.8 
                 −5.04 
               
               
                 13 
                   
                 11.205 
                 1.000 
                   
                   
                   
                   
               
               
                 14 
                 IR-cut 
                 Plano 
                 0.300 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                   
                 filter 
                   
                   
                   
                   
                   
                   
               
               
                 15 
                   
                 Plano 
                 0.300 
                   
                   
                   
                   
               
               
                 16 
                 Cover 
                 Plano 
                 0.400 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                   
                 glass 
                   
                   
                   
                   
                   
                   
               
               
                 17 
                   
                 Plano 
                 0.906 
                   
                   
                   
                   
               
               
                 18 
                 Image 
                 Plano 
                 — 
                   
                   
                   
                   
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 6 
               
             
            
               
                   
               
               
                 Aspheric Coefficients 
               
            
           
           
               
               
               
               
            
               
                   
                 Surface # 
                 6 
                 7 
               
               
                   
               
               
                   
                 k = 
                 −1.7591E+00 
                 −1.2811E+00 
               
               
                   
                 A4 = 
                 −3.1055E−04 
                  5.8563E−05 
               
               
                   
                 A6 = 
                 −1.3925E−04 
                 −1.3857E−04 
               
               
                   
               
            
           
         
       
     
     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] 
                 8.58 
                 (CT5 + CT6)/(CT1 + CT2 + CT3 + CT4) 
                 0.69 
               
               
                 Fno 
                 1.65 
                 (R5 − R6)/(R5 + R6) 
                 0.02 
               
               
                 HFOV 
                 19.8 
                 ((R9 + R10)/(R9 − R10)) + ((R11 + R12)/ 
                 −0.16 
               
               
                 [deg.] 
                   
                 (R11 − R12)) 
                   
               
               
                 V1 
                 38.0 
                 (|P1| + |P2|)/(|P5| + |P6|) 
                 0.31 
               
               
                 V2 
                 46.6 
                 Y11/Y62 
                 1.40 
               
               
                 V3 
                 46.6 
                 f/EPD 
                 1.65 
               
               
                 V4 
                 52.6 
                 fr/ff 
                 0.03 
               
               
                 V5 
                 46.6 
                 TL/f 
                 2.45 
               
               
                 V6 
                 23.8 
                 ΣCT/Td 
                 0.90 
               
               
                 Nmax 
                 1.847 
                 Td/ImgH 
                 6.03 
               
               
                 T12/T34 
                 0.61 
                 EPD/ImgH 
                 1.73 
               
               
                 f/R12 
                 0.77 
                 tan(2*HFOV) 
                 0.83 
               
               
                   
               
            
           
         
       
     
     4th Embodiment 
       FIG. 7  is a schematic view of an image capturing unit 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 image capturing unit according to the 4th embodiment. In  FIG. 7 , the image capturing unit includes the imaging lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor  490 . The imaging lens assembly includes, in order from an object side to an image side, a first lens element  410 , a second lens element  420 , an aperture stop  400 , 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 , a cover glass  475  and an image surface  480 , wherein the imaging lens assembly has a total of six single and non-cemented lens elements ( 410 - 460 ). 
     The first lens element  410  with negative refractive power has a convex object-side surface  411  and a concave image-side surface  412 . The first lens element  410  is made of glass material and has the object-side surface  411  and the image-side surface  412  being both spherical. 
     The second lens element  420  with positive refractive power has a convex object-side surface  421  and a concave image-side surface  422 . The second lens element  420  is made of glass material and has the object-side surface  421  and the image-side surface  422  being both spherical. 
     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 glass material and has the object-side surface  431  and the image-side surface  432  being both aspheric. 
     The fourth lens element  440  with positive refractive power has a concave object-side surface  441  and a convex image-side surface  442 . The fourth lens element  440  is made of glass material and has the object-side surface  441  and the image-side surface  442  being both spherical. 
     The fifth lens element  450  with positive refractive power has a convex object-side surface  451  and a convex image-side surface  452 . The fifth lens element  450  is made of glass material and has the object-side surface  451  and the image-side surface  452  being both aspheric. 
     The sixth lens element  460  with negative refractive power has 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 the object-side surface  461  and the image-side surface  462  being both aspheric. 
     The IR-cut filter  470  and the cover glass  475  are 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 lens assembly. The image sensor  490  is disposed on or near the image surface  480  of the imaging lens assembly. 
     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 = 8.21 mm, Fno = 1.65, HFOV = 20.3 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Sur- 
                   
                   
                   
                   
                   
                   
                   
               
               
                 face  
                   
                 Curvature  
                 Thick- 
                 Mate- 
                   
                 Abbe  
                 Focal  
               
               
                 #  
                   
                 Radius  
                 ness  
                 rial  
                 Index  
                 #  
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 Lens 1 
                 8.900 
                 2.580 
                 Glass 
                 1.603 
                 38.0 
                 −18.98 
               
               
                 2 
                   
                 4.461 
                 0.552 
                   
                   
                   
                   
               
               
                 3 
                 Lens 2 
                 6.795 
                 2.231 
                 Glass 
                 1.804 
                 46.6 
                 15.85 
               
               
                 4 
                   
                 12.428 
                 0.611 
                   
                   
                   
                   
               
               
                 5 
                 Ape.  
                 Plano 
                 −0.461 
                   
                   
                   
                   
               
               
                   
                 Stop  
                   
                   
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 6 
                 Lens 3 
                 5.080 
                 (ASP) 
                 0.820 
                 Glass 
                 1.804 
                 46.6 
                 113.83 
               
               
                 7 
                   
                 4.991 
                 (ASP) 
                 1.175 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 8 
                 Lens 4 
                 −4.656 
                 2.600 
                 Glass 
                 1.741 
                 52.6 
                 40.66 
               
               
                 9 
                   
                 −4.991 
                 0.100 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 10 
                 Lens 5 
                 7.255 
                 (ASP) 
                 3.278 
                 Glass 
                 1.804 
                 46.6 
                 4.87 
               
               
                 11 
                   
                 −6.801 
                 (ASP) 
                 0.253 
                   
                   
                   
                   
               
               
                 12 
                 Lens 6 
                 −4.309 
                 (ASP) 
                 3.800 
                 Plastic 
                 1.660 
                 20.4 
                 −7.81 
               
               
                 13 
                   
                 −35.466 
                 (ASP) 
                 1.000 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 14 
                 IR-cut 
                 Plano 
                 0.300 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                   
                 filter 
                   
                   
                   
                   
                   
                   
               
               
                 15 
                   
                 Plano 
                 0.300 
                   
                   
                   
                   
               
               
                 16 
                 Cover 
                 Plano 
                 0.400 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                   
                 glass 
                   
                   
                   
                   
                   
                   
               
               
                 17 
                   
                 Plano 
                 1.465 
                   
                   
                   
                   
               
               
                 18 
                 Image 
                 Plano 
                 — 
                 — 
                   
                   
                   
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 8 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 Surface # 
                 6 
                 7 
                 10 
               
               
                   
               
               
                 k = 
                 −4.6982E−01  
                 4.9412E−01 
                 −1.1841E+00 
               
               
                 A4 = 
                 8.6744E−04 
                 −2.0451E−04  
                 −2.3287E−05 
               
               
                 A6 = 
                 1.5344E−04 
                 2.2357E−04 
                 −1.2097E−05 
               
               
                   
               
               
                 Surface # 
                 11 
                 12 
                 13 
               
               
                   
               
               
                 k = 
                 −2.7054E+00 
                 −3.0583E+00 
                 1.7345E+00 
               
               
                 A4 = 
                  2.4485E−04 
                  1.4356E−03 
                 3.5885E−03 
               
               
                 A6 = 
                 −1.9518E−05 
                 −4.0032E−05 
                 −4.1211E−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] 
                 8.21 
                 (CT5 + CT6)/(CT1 + CT2 + CT3 + CT4) 
                 0.86 
               
               
                 Fno 
                 1.65 
                 (R5 − R6)/(R5 + R6) 
                 0.01 
               
               
                 HFOV 
                 20.3 
                 ((R9 + R10)/(R9 − R10)) + ((R11 + R12)/ 
                 −1.24 
               
               
                 [deg.] 
                   
                 (R11 − R12)) 
                   
               
               
                 V1 
                 38.0 
                 (|P1| + |P2|)/(|P5| + |P6|) 
                 0.35 
               
               
                 V2 
                 46.6 
                 Y11/Y62 
                 1.31 
               
               
                 V3 
                 46.6 
                 f/EPD 
                 1.65 
               
               
                 V4 
                 52.6 
                 fr/ff 
                 0.01 
               
               
                 V5 
                 46.6 
                 TL/f 
                 2.56 
               
               
                 V6 
                 20.4 
                 ΣCT/Td 
                 0.87 
               
               
                 Nmax 
                 1.804 
                 Td/ImgH 
                 5.85 
               
               
                 T12/T34 
                 0.47 
                 EPD/ImgH 
                 1.66 
               
               
                 f/R12 
                 −0.23 
                 tan(2*HFOV) 
                 0.86 
               
               
                   
               
            
           
         
       
     
     5th Embodiment 
       FIG. 9  is a schematic view of an image capturing unit 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 image capturing unit according to the 5th embodiment. In  FIG. 9 , the image capturing unit includes the imaging lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor  590 . The imaging lens assembly includes, in order from an object side to an image side, a first lens element  510 , a second lens element  520 , a third lens element  530 , an aperture stop  500 , a fourth lens element  540 , a fifth lens element  550 , a sixth lens element  560 , an IR-cut filter  570 , a cover glass  575  and an image surface  580 , wherein the imaging lens assembly has a total of six single and non-cemented lens elements ( 510 - 560 ). 
     The first lens element  510  with negative refractive power has a convex object-side surface  511  and a concave image-side surface  512 . The first lens element  510  is made of glass material and has the object-side surface  511  and the image-side surface  512  being both spherical. 
     The second lens element  520  with positive refractive power has a convex object-side surface  521  and a concave image-side surface  522 . The second lens element  520  is made of glass material and has the object-side surface  521  and the image-side surface  522  being both spherical. 
     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 the object-side surface  531  and the image-side surface  532  being both aspheric. 
     The fourth lens element  540  with positive refractive power has a concave object-side surface  541  and a convex image-side surface  542 . The fourth lens element  540  is made of glass material and has the object-side surface  541  and the image-side surface  542  being both aspheric. 
     The fifth lens element  550  with positive refractive power has a convex object-side surface  551  and a convex image-side surface  552 . The fifth lens element  550  is made of plastic material and has the object-side surface  551  and the image-side surface  552  being both aspheric. 
     The sixth lens element  560  with negative refractive power has a concave object-side surface  561  and a concave image-side surface  562 . The sixth lens element  560  is made of plastic material and has the object-side surface  561  and the image-side surface  562  being both aspheric. 
     The IR-cut filter  570  and the cover glass  575  are 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 lens assembly. The image sensor  590  is disposed on or near the image surface  580  of the imaging lens assembly. 
     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 = 8.87 mm, Fno = 1.65, HFOV = 19.8 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Sur- 
                   
                   
                   
                   
                   
                   
                   
               
               
                 face  
                   
                 Curvature  
                 Thick- 
                 Mate- 
                   
                 Abbe  
                 Focal  
               
               
                 #  
                   
                 Radius  
                 ness  
                 rial  
                 Index  
                 #  
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 Lens 1 
                 32.990 
                 0.750 
                 Glass 
                 1.603 
                 38.0 
                 −15.14 
               
               
                 2 
                   
                 7.094 
                 1.095 
                   
                   
                   
                   
               
               
                 3 
                 Lens 2 
                 11.015 
                 1.913 
                 Glass 
                 1.804 
                 46.6 
                 17.87 
               
               
                 4 
                   
                 43.579 
                 5.616 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 5 
                 Lens 3 
                 6.137 
                 (ASP) 
                 1.267 
                 Plastic 
                 1.544 
                 56.0 
                 83.60 
               
               
                 6 
                   
                 6.578 
                 (ASP) 
                 0.683 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 7 
                 Ape.  
                 Plano 
                 0.592 
                   
                   
                   
                   
               
               
                   
                 Stop  
                   
                   
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 8 
                 Lens 4 
                 −8.932 
                 (ASP) 
                 3.372 
                 Glass 
                 1.741 
                 52.6 
                 30.48 
               
               
                 9 
                   
                 −7.429 
                 (ASP) 
                 0.100 
                   
                   
                   
                   
               
               
                 10 
                 Lens 5 
                 5.624 
                 (ASP) 
                 3.924 
                 Plastic 
                 1.544 
                 56.0 
                 7.18 
               
               
                 11 
                   
                 −9.662 
                 (ASP) 
                 0.146 
                   
                   
                   
                   
               
               
                 12 
                 Lens 6 
                 −12.333 
                 (ASP) 
                 3.322 
                 Plastic 
                 1.660 
                 20.4 
                 −6.47 
               
               
                 13 
                   
                 7.231 
                 (ASP) 
                 1.000 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 14 
                 IR-cut 
                 Plano 
                 0.300 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                   
                 filter 
                   
                   
                   
                   
                   
                   
               
               
                 15 
                   
                 Plano 
                 0.300 
                   
                   
                   
                   
               
               
                 16 
                 Cover 
                 Plano 
                 0.400 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                   
                 glass 
                   
                   
                   
                   
                   
                   
               
               
                 17 
                   
                 Plano 
                 2.224 
                   
                   
                   
                   
               
               
                 18 
                 Image 
                 Plano 
                 — 
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 10 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
            
               
                 Surface # 
                 5 
                 6 
                 8 
                 9 
               
               
                   
               
               
                 k = 
                 −1.6343E+00  
                 −1.4237E+00 
                 2.0673E−01 
                 −1.6948E−01 
               
               
                 A4 = 
                 3.1621E−05 
                 −9.2043E−04 
                 — 
                 — 
               
               
                 A6 = 
                 4.1758E−05 
                  8.8975E−05 
                 — 
                 — 
               
               
                   
               
            
           
           
               
               
               
               
               
            
               
                 Surface # 
                 10 
                 11 
                 12 
                 13 
               
               
                   
               
               
                 k = 
                 −7.5953E−01 
                 −7.5026E+00 
                 8.2804E−02 
                 2.8098E−01 
               
               
                 A4 = 
                 −1.4529E−04 
                 −5.9395E−05 
                 1.2932E−03 
                 1.9761E−03 
               
               
                 A6 = 
                 −6.2186E−06 
                 −1.1683E−05 
                 −3.4402E−05  
                 4.5590E−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] 
                 8.87 
                 (CT5 + CT6)/(CT1 + CT2 + CT3 + CT4) 
                 0.99 
               
               
                 Fno 
                 1.65 
                 (R5 − R6)/(R5 + R6) 
                 −0.03 
               
               
                 HFOV 
                 19.8 
                 ((R9 + R10)/(R9 − R10)) + ((R11 + R12)/ 
                 −0.003 
               
               
                 [deg.] 
                   
                 (R11 − R12)) 
                   
               
               
                 V1 
                 38.0 
                 (|P1| + |P2|)/(|P5| + |P6|) 
                 0.42 
               
               
                 V2 
                 46.6 
                 Y11/Y62 
                 1.93 
               
               
                 V3 
                 56.0 
                 f/EPD 
                 1.65 
               
               
                 V4 
                 52.6 
                 fr/ff 
                 0.05 
               
               
                 V5 
                 56.0 
                 TL/f 
                 3.04 
               
               
                 V6 
                 20.4 
                 ΣCT/Td 
                 0.64 
               
               
                 Nmax 
                 1.804 
                 Td/ImgH 
                 7.12 
               
               
                 T12/T34 
                 0.86 
                 EPD/ImgH 
                 1.68 
               
               
                 f/R12 
                 1.23 
                 tan(2*HFOV) 
                 0.83 
               
               
                   
               
            
           
         
       
     
     6th Embodiment 
       FIG. 11  is a schematic view of an image capturing unit 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 image capturing unit according to the 6th embodiment. In  FIG. 11 , the image capturing unit includes the imaging lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor  690 . The imaging lens assembly includes, in order from an object side to an image side, a first lens element  610 , a second lens element  620 , an aperture stop  600 , 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 , a cover glass  675  and an image surface  680 , wherein the imaging lens assembly has a total of six single and non-cemented lens elements ( 610 - 660 ). 
     The first lens element  610  with negative refractive power has a concave object-side surface  611  and a concave image-side surface  612 . The first lens element  610  is made of plastic material and has the object-side surface  611  and the image-side surface  612  being both aspheric. 
     The second lens element  620  with positive refractive power has a convex object-side surface  621  and a convex image-side surface  622 . The second lens element  620  is made of plastic material and has the object-side surface  621  and the image-side surface  622  being both aspheric. 
     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 the object-side surface  631  and the image-side surface  632  being both aspheric. 
     The fourth lens element  640  with positive 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 the object-side surface  641  and the image-side surface  642  being both aspheric. 
     The fifth lens element  650  with positive refractive power has a convex object-side surface  651  and a convex image-side surface  652 . The fifth lens element  650  is made of plastic material and has the object-side surface  651  and the image-side surface  652  being both aspheric. 
     The sixth lens element  660  with negative refractive power has a concave object-side surface  661  and a concave image-side surface  662 . The sixth lens element  660  is made of plastic material and has the object-side surface  661  and the image-side surface  662  being both aspheric. 
     The IR-cut filter  670  and the cover glass  675  are 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 lens assembly. The image sensor  690  is disposed on or near the image surface  680  of the imaging lens assembly. 
     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 = 6.08 mm, Fno = 1.80, HFOV = 30.5 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Sur- 
                   
                   
                   
                   
                   
                   
                   
               
               
                 face  
                   
                 Curvature  
                 Thick- 
                 Mate- 
                   
                 Abbe  
                 Focal  
               
               
                 #  
                   
                 Radius  
                 ness  
                 rial  
                 Index  
                 #  
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 1 
                 Lens 1 
                 −9.329 
                 (ASP) 
                 0.750 
                 Plastic 
                 1.544 
                 56.0 
                 −7.73 
               
               
                 2 
                   
                 7.877 
                 (ASP) 
                 0.821 
                   
                   
                   
                   
               
               
                 3 
                 Lens 2 
                 22.675 
                 (ASP) 
                 1.312 
                 Plastic 
                 1.544 
                 56.0 
                 15.35 
               
               
                 4 
                   
                 −12.950 
                 (ASP) 
                 3.566 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 5 
                 Ape.  
                 Plano 
                 −0.245 
                   
                   
                   
                   
               
               
                   
                 Stop  
                   
                   
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 6 
                 Lens 3 
                 6.865 
                 (ASP) 
                 1.125 
                 Plastic 
                 1.544 
                 56.0 
                 84.12 
               
               
                 7 
                   
                 7.610 
                 (ASP) 
                 0.583 
                   
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 −7.047 
                 (ASP) 
                 1.381 
                 Plastic 
                 1.544 
                 56.0 
                 50.71 
               
               
                 9 
                   
                 −6.001 
                 (ASP) 
                 0.100 
                   
                   
                   
                   
               
               
                 10 
                 Lens 5 
                 3.989 
                 (ASP) 
                 3.424 
                 Plastic 
                 1.544 
                 56.0 
                 5.08 
               
               
                 11 
                   
                 −6.281 
                 (ASP) 
                 0.112 
                   
                   
                   
                   
               
               
                 12 
                 Lens 6 
                 −10.436 
                 (ASP) 
                 3.295 
                 Plastic 
                 1.660 
                 20.4 
                 −5.61 
               
               
                 13 
                   
                 6.451 
                 (ASP) 
                 1.000 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 14 
                 IR-cut 
                 Plano 
                 0.300 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                   
                 filter 
                   
                   
                   
                   
                   
                   
               
               
                 15 
                   
                 Plano 
                 0.300 
                   
                   
                   
                   
               
               
                 16 
                 Cover 
                 Plano 
                 0.400 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                   
                 glass 
                   
                   
                   
                   
                   
                   
               
               
                 17 
                   
                 Plano 
                 1.779 
                   
                   
                   
                   
               
               
                 18 
                 Image 
                 Plano 
                 — 
                   
                   
                   
                   
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 12 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 Surface #  
                 1 
                 2 
                 3 
                 4 
                 6 
                 7 
               
               
                   
               
               
                 k =  
                 −8.5655E+00 
                   3.2778E+00 
                 −8.0537E+01 
                 −7.7148E+00 
                 −1.6370E+01 
                 −2.6193E+01 
               
               
                 A4 =  
                   6.5569E−04 
                 −6.3077E−04 
                 −2.5523E−04 
                   7.6516E−04 
                   4.8739E−08 
                 −4.2134E−03 
               
               
                 A6 =  
                   1.6317E−05 
                 −4.4270E−05 
                 −1.0758E−05 
                   1.0685E−04 
                 −2.2634E−04 
                   2.4983E−04 
               
               
                 A8 =  
                 — 
                 — 
                 — 
                 — 
                   1.1611E−05 
                 — 
               
               
                   
               
               
                 Surface #  
                 8 
                 9 
                 10 
                 11 
                 12 
                 13 
               
               
                   
               
               
                 k =  
                 −9.0000E+00 
                 −3.3132E+00 
                 −2.2285E+00 
                 −3.9928E+00 
                   4.5646E+00 
                   7.7587E−02 
               
               
                 A4 =  
                   2.8678E−03 
                   8.5783E−04 
                 −7.9640E−04 
                 −4.2599E−04 
                   1.2534E−03 
                   2.0069E−03 
               
               
                 A6 =  
                   9.2159E−05 
                   4.5560E−06 
                   1.1818E−06 
                   3.6594E−06 
                   1.0063E−05 
                   9.7782E−05 
               
               
                 A8 =  
                 — 
                 — 
                 — 
                 — 
                 — 
                 −2.3197E−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] 
                 6.08 
                 (CT5 + CT6)/(CT1 + CT2 + CT3 + CT4) 
                 1.47 
               
               
                 Fno 
                 1.80 
                 (R5 − R6)/(R5 + R6) 
                 −0.05 
               
               
                 HFOV 
                 30.5 
                 ((R9 + R10)/(R9 − R10)) + ((R11 + R12)/ 
                 0.01 
               
               
                 [deg.] 
                   
                 (R11 − R12)) 
                   
               
               
                 V1 
                 56.0 
                 (|P1| + |P2|)/(|P5| + |P6|) 
                 0.52 
               
               
                 V2 
                 56.0 
                 Y11/Y62 
                 1.52 
               
               
                 V3 
                 56.0 
                 f/EPD 
                 1.80 
               
               
                 V4 
                 56.0 
                 fr/ff 
                 −0.33 
               
               
                 V5 
                 56.0 
                 TL/f 
                 3.29 
               
               
                 V6 
                 20.4 
                 ΣCT/Td 
                 0.70 
               
               
                 Nmax 
                 1.660 
                 Td/ImgH 
                 4.77 
               
               
                 T12/T34 
                 1.41 
                 EPD/ImgH 
                 0.99 
               
               
                 f/R12 
                 0.94 
                 tan(2*HFOV) 
                 1.80 
               
               
                   
               
            
           
         
       
     
     7th Embodiment 
       FIG. 13  is a schematic view of an image capturing unit 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 image capturing unit according to the 7th embodiment. In  FIG. 13 , the image capturing unit includes the imaging lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor  790 . The imaging lens assembly includes, in order from an object side to an image side, a first lens element  710 , a second lens element  720 , an aperture stop  700 , 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 , a cover glass  775  and an image surface  780 , wherein the imaging lens assembly has a total of six single and non-cemented lens elements ( 710 - 760 ). 
     The first lens element  710  with negative refractive power has a concave object-side surface  711  and a concave image-side surface  712 . The first lens element  710  is made of plastic material and has the object-side surface  711  and the image-side surface  712  being both aspheric. 
     The second lens element  720  with positive refractive power has a convex object-side surface  721  and a convex image-side surface  722 . The second lens element  720  is made of plastic material and has the object-side surface  721  and the image-side surface  722  being both aspheric. 
     The third lens element  730  with positive 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 the object-side surface  731  and the image-side surface  732  being both aspheric. 
     The fourth lens element  740  with positive refractive power has a concave object-side surface  741  and a convex image-side surface  742 . The fourth lens element  740  is made of plastic material and has the object-side surface  741  and the image-side surface  742  being both aspheric. 
     The fifth lens element  750  with positive refractive power has a convex object-side surface  751  and a convex image-side surface  752 . The fifth lens element  750  is made of plastic material and has the object-side surface  751  and the image-side surface  752  being both aspheric. 
     The sixth lens element  760  with negative refractive power has a convex object-side surface  761  and a concave image-side surface  762 . The sixth lens element  760  is made of plastic material and has the object-side surface  761  and the image-side surface  762  being both aspheric. 
     The IR-cut filter  770  and the cover glass  775  are 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 lens assembly. The image sensor  790  is disposed on or near the image surface  780  of the imaging lens assembly. 
     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 = 5.68 mm, Fno = 2.10, HFOV = 31.7 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Sur- 
                   
                   
                   
                   
                   
                   
                   
               
               
                 face  
                   
                 Curvature  
                 Thick- 
                 Mate- 
                   
                 Abbe  
                 Focal  
               
               
                 #  
                   
                 Radius  
                 ness  
                 rial  
                 Index  
                 #  
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 1 
                 Lens 1 
                 −10.521 
                 (ASP) 
                 0.750 
                 Plastic 
                 1.544 
                 56.0 
                 −8.60 
               
               
                 2 
                   
                 8.632 
                 (ASP) 
                 0.943 
                   
                   
                   
                   
               
               
                 3 
                 Lens 2 
                 166.405 
                 (ASP) 
                 1.158 
                 Plastic 
                 1.544 
                 56.0 
                 20.62 
               
               
                 4 
                   
                 −11.997 
                 (ASP) 
                 5.298 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 5 
                 Ape.  
                 Plano 
                 −0.154 
                   
                   
                   
                   
               
               
                   
                 Stop  
                   
                   
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 6 
                 Lens 3 
                 7.654 
                 (ASP) 
                 1.196 
                 Plastic 
                 1.544 
                 56.0 
                 37.31 
               
               
                 7 
                   
                 11.610 
                 (ASP) 
                 0.281 
                   
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 −9.999 
                 (ASP) 
                 1.252 
                 Plastic 
                 1.544 
                 56.0 
                 40.00 
               
               
                 9 
                   
                 −7.153 
                 (ASP) 
                 0.100 
                   
                   
                   
                   
               
               
                 10 
                 Lens 5 
                 4.176 
                 (ASP) 
                 2.307 
                 Plastic 
                 1.544 
                 56.0 
                 5.12 
               
               
                 11 
                   
                 −6.732 
                 (ASP) 
                 0.112 
                   
                   
                   
                   
               
               
                 12 
                 Lens 6 
                 46.790 
                 (ASP) 
                 1.519 
                 Plastic 
                 1.660 
                 20.4 
                 −5.95 
               
               
                 13 
                   
                 3.578 
                 (ASP) 
                 1.000 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 14 
                 IR-cut 
                 Plano 
                 0.300 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                   
                 filter 
                   
                   
                   
                   
                   
                   
               
               
                 15 
                   
                 Plano 
                 0.300 
                   
                   
                   
                   
               
               
                 16 
                 Cover 
                 Plano 
                 0.400 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                   
                 glass 
                   
                   
                   
                   
                   
                   
               
               
                 17 
                   
                 Plano 
                 3.242 
                   
                   
                   
                   
               
               
                 18 
                 Image 
                 Plano 
                 — 
                   
                   
                   
                   
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 14 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                 Surface #  
                 1 
                 2 
                 3 
                 4 
                 6 
                 7 
               
               
                   
               
               
                 k =  
                 −1.4760E+01 
                   2.5840E+00 
                 −1.6000E+01 
                 −6.6098E+00 
                 −1.3243E+01 
                 −6.4729E+01 
               
               
                 A4 =  
                   9.8043E−04 
                 −2.1692E−04 
                 −2.1145E−04 
                   2.1628E−03 
                 −3.2873E−04 
                 −4.8061E−03 
               
               
                 A6 =  
                   1.3990E−06 
                 −5.1302E−05 
                   1.9655E−05 
                   5.1845E−05 
                 −3.2844E−04 
                   6.3460E−05 
               
               
                 A8 =  
                 — 
                 — 
                 — 
                   4.7575E−06 
                 −2.1862E−05 
                 −6.6460E−06 
               
               
                   
               
               
                 Surface #  
                 8 
                 9 
                 10 
                 11 
                 12 
                 13 
               
               
                   
               
               
                 k =  
                 −1.4914E+01 
                 −4.1609E+00 
                 −3.6384E+00 
                 −6.0449E−01 
                 −5.8000E+01 
                   1.4469E−01 
               
               
                 A4 =  
                   2.5760E−03 
                   9.9053E−04 
                 −9.1707E−04 
                 −7.6337E−04 
                 −1.8617E−03 
                 −1.8759E−03 
               
               
                 A6 =  
                   2.4844E−04 
                   1.2523E−04 
                 −2.2201E−04 
                 −5.7438E−05 
                   2.2887E−05 
                 −2.1376E−04 
               
               
                 A8 =  
                 — 
                 — 
                 — 
                 — 
                 — 
                 −2.1452E−05 
               
               
                   
               
            
           
         
       
     
     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] 
                 5.68 
                 (CT5 + CT6)/(CT1 + CT2 + CT3 + CT4) 
                 0.88 
               
               
                 Fno 
                 2.10 
                 (R5 − R6)/(R5 + R6) 
                 −0.21 
               
               
                 HFOV 
                 31.7 
                 ((R9 + R10)/(R9 − R10)) + ((R11 + R12)/ 
                 0.93 
               
               
                 [deg.] 
                   
                 (R11 − R12)) 
                   
               
               
                 V1 
                 56.0 
                 (|P1| + |P2|)/(|P5| + |P6|) 
                 0.45 
               
               
                 V2 
                 56.0 
                 Y11/Y62 
                 1.89 
               
               
                 V3 
                 56.0 
                 f/EPD 
                 2.10 
               
               
                 V4 
                 56.0 
                 fr/ff 
                 −0.37 
               
               
                 V5 
                 56.0 
                 TL/f 
                 3.52 
               
               
                 V6 
                 20.4 
                 ΣCT/Td 
                 0.55 
               
               
                 Nmax 
                 1.660 
                 Td/ImgH 
                 4.34 
               
               
                 T12/T34 
                 3.36 
                 EPD/ImgH 
                 0.80 
               
               
                 f/R12 
                 1.59 
                 tan(2*HFOV) 
                 2.00 
               
               
                   
               
            
           
         
       
     
     8th Embodiment 
       FIG. 15  is a schematic view of an image capturing unit 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 image capturing unit according to the 8th embodiment. In  FIG. 15 , the image capturing unit includes the imaging lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor  890 . The imaging lens assembly includes, in order from an object side to an image side, a first lens element  810 , a second lens element  820 , an aperture stop  800 , 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 , a cover glass  875  and an image surface  880 , wherein the imaging lens assembly has a total of six lens elements ( 810 - 860 ). The first lens element  810 , the second lens element  820 , the third lens element  830  and the fourth lens element  840  are single and non-cemented lens elements. The fifth lens element  850  and the sixth lens element  860  are cemented lens elements. 
     The first lens element  810  with negative refractive power has a concave object-side surface  811  and a concave image-side surface  812 . The first lens element  810  is made of glass material and has the object-side surface  811  and the image-side surface  812  being both spherical. 
     The second lens element  820  with positive refractive power has a convex object-side surface  821  and a convex image-side surface  822 . The second lens element  820  is made of glass material and has the object-side surface  821  and the image-side surface  822  being both spherical. 
     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 glass material and has the object-side surface  831  and the image-side surface  832  being both spherical. 
     The fourth lens element  840  with positive refractive power has a concave object-side surface  841  and a convex image-side surface  842 . The fourth lens element  840  is made of glass material and has the object-side surface  841  and the image-side surface  842  being both spherical. 
     The fifth lens element  850  with positive refractive power has a convex object-side surface  851  and a convex image-side surface  852 . The fifth lens element  850  is made of glass material and has the object-side surface  851  and the image-side surface  852  being both spherical. 
     The sixth lens element  860  with negative refractive power has a concave object-side surface  861  and a concave image-side surface  862 . The sixth lens element  860  is made of glass material and has the object-side surface  861  and the image-side surface  862  being both spherical. 
     The IR-cut filter  870  and the cover glass  875  are 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 lens assembly. The image sensor  890  is disposed on or near the image surface  880  of the imaging lens assembly. 
     The detailed optical data of the 8th embodiment are shown in Table 15 below. 
     
       
         
           
               
             
               
                 TABLE 15 
               
             
            
               
                   
               
               
                 8th Embodiment  
               
               
                 f = 8.20 mm, Fno = 1.65, HFOV = 21.1 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Sur- 
                   
                   
                   
                   
                   
                   
                   
               
               
                 face  
                   
                 Curvature  
                 Thick- 
                 Mate- 
                   
                 Abbe  
                 Focal  
               
               
                 #  
                   
                 Radius  
                 ness  
                 rial  
                 Index  
                 #  
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 Lens 1 
                 −17.936 
                 0.750 
                 Glass 
                 1.606 
                 43.7 
                 −8.40 
               
               
                 2 
                   
                 7.213 
                 0.655 
                   
                   
                   
                   
               
               
                 3 
                 Lens 2 
                 17.920 
                 1.682 
                 Glass 
                 1.804 
                 46.6 
                 11.39 
               
               
                 4 
                   
                 −17.945 
                 1.671 
                   
                   
                   
                   
               
               
                 5 
                 Ape.  
                 Plano 
                 −0.500 
                   
                   
                   
                   
               
               
                   
                 Stop  
                   
                   
                   
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 8.492 
                 5.000 
                 Glass 
                 1.804 
                 46.6 
                 44.15 
               
               
                 7 
                   
                 8.233 
                 0.975 
                   
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 −18.974 
                 1.887 
                 Glass 
                 1.741 
                 52.6 
                 14.16 
               
               
                 9 
                   
                 −7.041 
                 0.100 
                   
                   
                   
                   
               
               
                 10 
                 Lens 5 
                 9.621 
                 4.282 
                 Glass 
                 1.804 
                 46.6 
                 4.98 
               
               
                 11 
                   
                 −5.501 
                 0.010 
                 Cement 
                 1.514 
                 38.8 
                   
               
               
                 12 
                 Lens 6 
                 −5.499 
                 3.800 
                 Glass 
                 1.847 
                 23.8 
                 −4.11 
               
               
                 13 
                   
                 12.446 
                 1.000 
                   
                   
                   
                   
               
               
                 14 
                 IR-cut 
                 Plano 
                 0.300 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                   
                 filter 
                   
                   
                   
                   
                   
                   
               
               
                 15 
                   
                 Plano 
                 0.300 
                   
                   
                   
                   
               
               
                 16 
                 Cover 
                 Plano 
                 0.400 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                   
                 glass 
                   
                   
                   
                   
                   
                   
               
               
                 17 
                   
                 Plano 
                 0.696 
                   
                   
                   
                   
               
               
                 18 
                 Image 
                 Plano 
                 — 
                   
                   
                   
                   
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
            
           
         
       
     
     In the 8th embodiment, 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 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 8th Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 8.20 
                 (CT5 + CT6)/(CT1 + CT2 + CT3 + CT4) 
                 0.87 
               
               
                 Fno 
                 1.65 
                 (R5 − R6)/(R5 + R6) 
                 0.02 
               
               
                 HFOV 
                 21.1 
                 ((R9 + R10)/(R9 − R10)) + ((R11 + R12)/ 
                 −0.11 
               
               
                 [deg.] 
                   
                 (R11 − R12)) 
                   
               
               
                 V1 
                 43.7 
                 (|P1| + |P2|)/(|P5| + |P6|) 
                 0.47 
               
               
                 V2 
                 46.6 
                 Y11/Y62 
                 1.28 
               
               
                 V3 
                 46.6 
                 f/EPD 
                 1.65 
               
               
                 V4 
                 52.6 
                 fr/ff 
                 −0.15 
               
               
                 V5 
                 46.6 
                 TL/f 
                 2.81 
               
               
                 V6 
                 23.8 
                 ΣCT/Td 
                 0.86 
               
               
                 Nmax 
                 1.847 
                 Td/ImgH 
                 6.77 
               
               
                 T12/T34 
                 0.67 
                 EPD/ImgH 
                 1.66 
               
               
                 f/R12 
                 0.66 
                 tan(2*HFOV) 
                 0.91 
               
               
                   
               
            
           
         
       
     
     9th Embodiment 
       FIG. 17  is a schematic view of an image capturing unit 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 image capturing unit according to the 9th embodiment. In  FIG. 17 , the image capturing unit includes the imaging lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor  990 . The imaging lens assembly includes, in order from an object side to an image side, a first lens element  910 , a second lens element  920 , an aperture stop  900 , 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 , a cover glass  975  and an image surface  980 , wherein the imaging lens assembly has a total of six lens elements ( 910 - 960 ). The first lens element  910 , the second lens element  920 , the third lens element  930  and the fourth lens element  940  are single and non-cemented lens elements. The fifth lens element  950  and the sixth lens element  960  are cemented lens elements. 
     The first lens element  910  with negative refractive power has a concave object-side surface  911  and a convex image-side surface  912 . The first lens element  910  is made of glass material and has the object-side surface  911  and the image-side surface  912  being both spherical. 
     The second lens element  920  with positive refractive power has a concave object-side surface  921  and a convex image-side surface  922 . The second lens element  920  is made of glass material and has the object-side surface  921  and the image-side surface  922  being both spherical. 
     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 glass material and has the object-side surface  931  and the image-side surface  932  being both spherical. 
     The fourth lens element  940  with positive refractive power has a convex object-side surface  941  and a convex image-side surface  942 . The fourth lens element  940  is made of glass material and has the object-side surface  941  and the image-side surface  942  being both aspheric. 
     The fifth lens element  950  with positive refractive power has a convex object-side surface  951  and a convex image-side surface  952 . The fifth lens element  950  is made of glass material and has the object-side surface  951  and the image-side surface  952  being both spherical. 
     The sixth lens element  960  with negative refractive power has a concave object-side surface  961  and a concave image-side surface  962 . The sixth lens element  960  is made of glass material and has the object-side surface  961  and the image-side surface  962  being both spherical. 
     The IR-cut filter  970  and the cover glass  975  are 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 lens assembly. The image sensor  990  is disposed on or near the image surface  980  of the imaging lens assembly. 
     The detailed optical data of the 9th embodiment are shown in Table 16 and the aspheric surface data are shown in Table 17 below. 
     
       
         
           
               
             
               
                 TABLE 16 
               
             
            
               
                   
               
               
                 9th Embodiment  
               
               
                 f = 9.44 mm, Fno = 1.65, HFOV = 18.5 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Sur- 
                   
                   
                   
                   
                   
                   
                   
               
               
                 face  
                   
                 Curvature  
                 Thick- 
                 Mate- 
                   
                 Abbe  
                 Focal  
               
               
                 #  
                   
                 Radius  
                 ness  
                 rial  
                 Index  
                 #  
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 Lens 1 
                 −6.612 
                 0.750 
                 Glass 
                 1.606 
                 43.7 
                 −15.50 
               
               
                 2 
                   
                 −23.335 
                 0.972 
                   
                   
                   
                   
               
               
                 3 
                 Lens 2 
                 −6.640 
                 1.238 
                 Glass 
                 1.804 
                 46.6 
                 75.82 
               
               
                 4 
                   
                 −6.486 
                 1.013 
                   
                   
                   
                   
               
               
                 5 
                 Ape.  
                 Plano 
                 −0.863 
                   
                   
                   
                   
               
               
                   
                 Stop  
                   
                   
                   
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 8.299 
                 1.419 
                 Glass 
                 1.804 
                 46.6 
                 25.64 
               
               
                 7 
                   
                 12.832 
                 2.717 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
               
            
               
                 8 
                 Lens 4 
                 10.063 
                 (ASP) 
                 2.170 
                 Glass 
                 1.741 
                 52.6 
                 9.83 
               
               
                 9 
                   
                 −23.938 
                 (ASP) 
                 0.100 
                   
                   
                   
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 10 
                 Lens 5 
                 26.302 
                 2.083 
                 Glass 
                 1.804 
                 46.6 
                 9.75 
               
               
                 11 
                   
                 −10.773 
                 0.010 
                 Cement 
                 1.514 
                 38.8 
                   
               
               
                 12 
                 Lens 6 
                 −10.773 
                 3.800 
                 Glass 
                 1.847 
                 23.8 
                 −5.85 
               
               
                 13 
                   
                 10.636 
                 1.000 
                   
                   
                   
                   
               
               
                 14 
                 IR-cut 
                 Plano 
                 0.300 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                   
                 filter 
                   
                   
                   
                   
                   
                   
               
               
                 15 
                   
                 Plano 
                 0.300 
                   
                   
                   
                   
               
               
                 16 
                 Cover 
                 Plano 
                 0.400 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                   
                 glass 
                   
                   
                   
                   
                   
                   
               
               
                 17 
                   
                 Plano 
                 3.594 
                   
                   
                   
                   
               
               
                 18 
                 Image 
                 Plano 
                 — 
                   
                   
                   
                   
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
            
           
         
       
     
     
       
         
           
               
             
               
                 TABLE 17 
               
             
            
               
                   
               
               
                 Aspheric Coefficients 
               
            
           
           
               
               
               
               
            
               
                   
                 Surface # 
                 8 
                 9 
               
               
                   
               
               
                   
                 k = 
                 −1.3805E+00 
                 2.2395E+00 
               
               
                   
                 A4 = 
                 −8.0081E−05 
                 2.9676E−04 
               
               
                   
                 A6 = 
                 — 
                 1.8142E−06 
               
               
                   
               
            
           
         
       
     
     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 16 and Table 17 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 9th Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 9.44 
                 (CT5 + CT6)/(CT1 + CT2 + CT3 + CT4) 
                 1.05 
               
               
                 Fno 
                 1.65 
                 (R5 − R6)/(R5 + R6) 
                 −0.21 
               
               
                 HFOV 
                 18.5 
                 ((R9 + R10)/(R9 − R10)) + ((R11 + R12)/ 
                 0.43 
               
               
                 [deg.] 
                   
                 (R11 − R12)) 
                   
               
               
                 V1 
                 43.7 
                 (|P1| + |P2|)/(|P5| + |P6|) 
                 0.28 
               
               
                 V2 
                 46.6 
                 Y11/Y62 
                 1.14 
               
               
                 V3 
                 46.6 
                 f/EPD 
                 1.65 
               
               
                 V4 
                 52.6 
                 fr/ff 
                 −0.37 
               
               
                 V5 
                 46.6 
                 TL/f 
                 2.23 
               
               
                 V6 
                 23.8 
                 ΣCT/Td 
                 0.74 
               
               
                 Nmax 
                 1.847 
                 Td/ImgH 
                 5.14 
               
               
                 T12/T34 
                 0.36 
                 EPD/ImgH 
                 1.91 
               
               
                 f/R12 
                 0.89 
                 tan(2*HFOV) 
                 0.75 
               
               
                   
               
            
           
         
       
     
     10th Embodiment 
       FIG. 19  is a schematic view of an image capturing unit 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 image capturing unit according to the 10th embodiment. In  FIG. 19 , the image capturing unit includes the imaging lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor  1090 . The imaging lens assembly includes, in order from an object side to an image side, a first lens element  1010 , a second lens element  1020 , an aperture stop  1000 , 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 , a cover glass  1075  and an image surface  1080 , wherein the imaging lens assembly has a total of six lens elements ( 1010 - 1060 ). The first lens element  1010 , the second lens element  1020 , the third lens element  1030  and the fourth lens element  1040  are single and non-cemented lens elements. The fifth lens element  1050  and the sixth lens element  1060  are cemented lens elements. 
     The first lens element  1010  with negative refractive power has a convex object-side surface  1011  and a concave image-side surface  1012 . The first lens element  1010  is made of glass material and has the object-side surface  1011  and the image-side surface  1012  being both spherical. 
     The second lens element  1020  with positive refractive power has a convex object-side surface  1021  and a concave image-side surface  1022 . The second lens element  1020  is made of glass material and has the object-side surface  1021  and the image-side surface  1022  being both spherical. 
     The third lens element  1030  with positive refractive power has a convex object-side surface  1031  and a concave image-side surface  1032 . The third lens element  1030  is made of glass material and has the object-side surface  1031  and the image-side surface  1032  being both spherical. 
     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 glass material and has the object-side surface  1041  and the image-side surface  1042  being both spherical. 
     The fifth lens element  1050  with positive refractive power has a convex object-side surface  1051  and a convex image-side surface  1052 . The fifth lens element  1050  is made of glass material and has the object-side surface  1051  and the image-side surface  1052  being both spherical. 
     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 glass material and has the object-side surface  1061  and the image-side surface  1062  being both spherical. 
     The IR-cut filter  1070  and the cover glass  1075  are 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 lens assembly. The image sensor  1090  is disposed on or near the image surface  1080  of the imaging lens assembly. 
     The detailed optical data of the 10th embodiment are shown in Table 18 below. 
     
       
         
           
               
             
               
                 TABLE 18 
               
             
            
               
                   
               
               
                 10th Embodiment  
               
               
                 f = 8.04 mm, Fno = 1.65, HFOV = 21.7 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Sur- 
                   
                   
                   
                   
                   
                   
                   
               
               
                 face  
                   
                 Curvature  
                 Thick- 
                 Mate- 
                   
                 Abbe  
                 Focal  
               
               
                 #  
                   
                 Radius  
                 ness  
                 rial  
                 Index  
                 #  
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 Lens 1 
                 8.608 
                 0.750 
                 Glass 
                 1.656 
                 29.8 
                 −14.40 
               
               
                 2 
                   
                 4.348 
                 0.942 
                   
                   
                   
                   
               
               
                 3 
                 Lens 2 
                 4.976 
                 3.327 
                 Glass 
                 1.826 
                 35.8 
                 36.70 
               
               
                 4 
                   
                 4.153 
                 0.837 
                   
                   
                   
                   
               
               
                 5 
                 Ape.  
                 Plano 
                 −0.353 
                   
                   
                   
                   
               
               
                   
                 Stop  
                   
                   
                   
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 6.117 
                 1.813 
                 Glass 
                 1.804 
                 46.6 
                 12.95 
               
               
                 7 
                   
                 12.865 
                 2.659 
                   
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 −31.902 
                 2.018 
                 Glass 
                 1.804 
                 46.6 
                 10.63 
               
               
                 9 
                   
                 −6.932 
                 0.100 
                   
                   
                   
                   
               
               
                 10 
                 Lens 5 
                 8.299 
                 3.349 
                 Glass 
                 1.805 
                 46.2 
                 5.19 
               
               
                 11 
                   
                 −6.893 
                 0.010 
                 Cement 
                 1.514 
                 38.8 
                   
               
               
                 12 
                 Lens 6 
                 −6.893 
                 2.534 
                 Glass 
                 1.851 
                 22.3 
                 −4.38 
               
               
                 13 
                   
                 9.509 
                 1.000 
                   
                   
                   
                   
               
               
                 14 
                 IR-cut 
                 Plano 
                 0.300 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                   
                 filter 
                   
                   
                   
                   
                   
                   
               
               
                 15 
                   
                 Plano 
                 0.300 
                   
                   
                   
                   
               
               
                 16 
                 Cover 
                 Plano 
                 0.400 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                   
                 glass 
                   
                   
                   
                   
                   
                   
               
               
                 17 
                   
                 Plano 
                 1.016 
                   
                   
                   
                   
               
               
                 18 
                 Image 
                 Plano 
                 — 
                   
                   
                   
                   
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
            
           
         
       
     
     In the 10th embodiment, 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 18 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 10th Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 8.04 
                 (CT5 + CT6)/(CT1 + CT2 + CT3 + CT4) 
                 0.74 
               
               
                 Fno 
                 1.65 
                 (R5 − R6)/(R5 + R6) 
                 −0.36 
               
               
                 HFOV 
                 21.7 
                 ((R9 + R10)/(R9 − R10)) + ((R11 + R12)/ 
                 −0.07 
               
               
                 [deg.] 
                   
                 (R11 − R12)) 
                   
               
               
                 V1 
                 29.8 
                 (|P1| + |P2|)/(|P5| + |P6|) 
                 0.23 
               
               
                 V2 
                 35.8 
                 Y11/Y62 
                 1.29 
               
               
                 V3 
                 46.6 
                 f/EPD 
                 1.65 
               
               
                 V4 
                 46.6 
                 fr/ff 
                 −0.36 
               
               
                 V5 
                 46.2 
                 TL/f 
                 2.61 
               
               
                 V6 
                 22.3 
                 ΣCT/Td 
                 0.77 
               
               
                 Nmax 
                 1.851 
                 Td/ImgH 
                 6.00 
               
               
                 T12/T34 
                 0.35 
                 EPD/ImgH 
                 1.62 
               
               
                 f/R12 
                 0.85 
                 tan(2*HFOV) 
                 0.95 
               
               
                   
               
            
           
         
       
     
     11th Embodiment 
       FIG. 21  is a schematic view of an image capturing unit according to the 11th embodiment of the present disclosure.  FIG. 22  shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 11th embodiment. In  FIG. 21 , the image capturing unit includes the imaging lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor  1190 . The imaging lens assembly includes, in order from an object side to an image side, a first lens element  1110 , a second lens element  1120 , an aperture stop  1100 , a third lens element  1130 , a fourth lens element  1140 , a fifth lens element  1150 , a sixth lens element  1160 , an IR-cut filter  1170 , a cover glass  1175  and an image surface  1180 , wherein the imaging lens assembly has a total of six lens elements ( 1110 - 1160 ). The first lens element  1110 , the second lens element  1120 , the third lens element  1130  and the fourth lens element  1140  are single and non-cemented lens elements. The fifth lens element  1150  and the sixth lens element  1160  are cemented lens elements. 
     The first lens element  1110  with negative refractive power has a convex object-side surface  1111  and a concave image-side surface  1112 . The first lens element  1110  is made of glass material and has the object-side surface  1111  and the image-side surface  1112  being both spherical. 
     The second lens element  1120  with positive refractive power has a convex object-side surface  1121  and a convex image-side surface  1122 . The second lens element  1120  is made of glass material and has the object-side surface  1121  and the image-side surface  1122  being both spherical. 
     The third lens element  1130  with positive refractive power has a convex object-side surface  1131  and a concave image-side surface  1132 . The third lens element  1130  is made of glass material and has the object-side surface  1131  and the image-side surface  1132  being both spherical. 
     The fourth lens element  1140  with positive refractive power has a concave object-side surface  1141  and a convex image-side surface  1142 . The fourth lens element  1140  is made of glass material and has the object-side surface  1141  and the image-side surface  1142  being both spherical. 
     The fifth lens element  1150  with positive refractive power has a convex object-side surface  1151  and a convex image-side surface  1152 . The fifth lens element  1150  is made of glass material and has the object-side surface  1151  and the image-side surface  1152  being both spherical. 
     The sixth lens element  1160  with negative refractive power has a concave object-side surface  1161  and a concave image-side surface  1162 . The sixth lens element  1160  is made of glass material and has the object-side surface  1161  and the image-side surface  1162  being both spherical. 
     The IR-cut filter  1170  and the cover glass  1175  are made of glass material and located between the sixth lens element  1160  and the image surface  1180 , and will not affect the focal length of the imaging lens assembly. The image sensor  1190  is disposed on or near the image surface  1180  of the imaging lens assembly. 
     The detailed optical data of the 11th embodiment are shown in Table 19 below. 
     
       
         
           
               
             
               
                 TABLE 19 
               
             
            
               
                   
               
               
                 11th Embodiment  
               
               
                 f = 7.91 mm, Fno = 1.65, HFOV = 21.4 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Sur- 
                   
                   
                   
                   
                   
                   
                   
               
               
                 face  
                   
                 Curvature  
                 Thick- 
                 Mate- 
                   
                 Abbe  
                 Focal  
               
               
                 #  
                   
                 Radius  
                 ness  
                 rial  
                 Index  
                 #  
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 Lens 1 
                 7.838 
                 1.880 
                 Glass 
                 1.689 
                 31.1 
                 −15.16 
               
               
                 2 
                   
                 4.039 
                 1.349 
                   
                   
                   
                   
               
               
                 3 
                 Lens 2 
                 21.717 
                 1.386 
                 Glass 
                 1.804 
                 46.6 
                 16.53 
               
               
                 4 
                   
                 −33.263 
                 0.901 
                   
                   
                   
                   
               
               
                 5 
                 Ape.  
                 Plano 
                 −0.632 
                   
                   
                   
                   
               
               
                   
                 Stop  
                   
                   
                   
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 4.816 
                 1.806 
                 Glass 
                 1.835 
                 42.7 
                 68.79 
               
               
                 7 
                   
                 4.360 
                 1.283 
                   
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 −10.279 
                 2.766 
                 Glass 
                 1.772 
                 49.6 
                 12.28 
               
               
                 9 
                   
                 −5.511 
                 0.100 
                   
                   
                   
                   
               
               
                 10 
                 Lens 5 
                 10.374 
                 3.700 
                 Glass 
                 1.804 
                 46.6 
                 4.98 
               
               
                 11 
                   
                 −5.480 
                 0.010 
                 Cement 
                 1.514 
                 38.8 
                   
               
               
                 12 
                 Lens 6 
                 −5.480 
                 3.304 
                 Glass 
                 1.847 
                 23.8 
                 −4.84 
               
               
                 13 
                   
                 20.794 
                 1.000 
                   
                   
                   
                   
               
               
                 14 
                 IR-cut 
                 Plano 
                 0.300 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                   
                 filter 
                   
                   
                   
                   
                   
                   
               
               
                 15 
                   
                 Plano 
                 0.300 
                   
                   
                   
                   
               
               
                 16 
                 Cover 
                 Plano 
                 0.400 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                   
                 glass 
                   
                   
                   
                   
                   
                   
               
               
                 17 
                   
                 Plano 
                 1.065 
                   
                   
                   
                   
               
               
                 18 
                 Image 
                 Plano 
                 — 
                   
                   
                   
                   
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
            
           
         
       
     
     In the 11th embodiment, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 11th embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from Table 19 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 11th Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 7.91 
                 (CT5 + CT6)/(CT1 + CT2 + CT3 + CT4) 
                 0.89 
               
               
                 Fno 
                 1.65 
                 (R5 − R6)/(R5 + R6) 
                 0.05 
               
               
                 HFOV 
                 21.4 
                 ((R9 + R10)/(R9 − R10)) + ((R11 + R12)/ 
                 −0.27 
               
               
                 [deg.] 
                   
                 (R11 − R12)) 
                   
               
               
                 V1 
                 31.1 
                 (|P1| + |P2|)/(|P5| + |P6|) 
                 0.31 
               
               
                 V2 
                 46.6 
                 Y11/Y62 
                 1.35 
               
               
                 V3 
                 42.7 
                 f/EPD 
                 1.65 
               
               
                 V4 
                 49.6 
                 fr/ff 
                 −0.04 
               
               
                 V5 
                 46.6 
                 TL/f 
                 2.64 
               
               
                 V6 
                 23.8 
                 ΣCT/Td 
                 0.83 
               
               
                 Nmax 
                 1.847 
                 Td/ImgH 
                 5.95 
               
               
                 T12/T34 
                 1.05 
                 EPD/ImgH 
                 1.60 
               
               
                 f/R12 
                 0.38 
                 tan(2*HFOV) 
                 0.93 
               
               
                   
               
            
           
         
       
     
     12th Embodiment 
       FIG. 23  is a schematic view of an image capturing unit according to the 12th embodiment of the present disclosure.  FIG. 24  shows, in order from left to right, spherical aberration curves, astigmatic field curves and a distortion curve of the image capturing unit according to the 12th embodiment. In  FIG. 23 , the image capturing unit includes the imaging lens assembly (its reference numeral is omitted) of the present disclosure and an image sensor  1290 . The imaging lens assembly includes, in order from an object side to an image side, a first lens element  1210 , a second lens element  1220 , an aperture stop  1200 , a third lens element  1230 , a fourth lens element  1240 , a fifth lens element  1250 , a sixth lens element  1260 , an IR-cut filter  1270 , a cover glass  1275  and an image surface  1280 , wherein the imaging lens assembly has a total of six lens elements ( 1210 - 1260 ). The first lens element  1210 , the second lens element  1220 , the third lens element  1230  and the fourth lens element  1240  are single and non-cemented lens elements. The fifth lens element  1250  and the sixth lens element  1260  are cemented lens elements. 
     The first lens element  1210  with negative refractive power has a convex object-side surface  1211  and a concave image-side surface  1212 . The first lens element  1210  is made of glass material and has the object-side surface  1211  and the image-side surface  1212  being both spherical. 
     The second lens element  1220  with positive refractive power has a convex object-side surface  1221  and a convex image-side surface  1222 . The second lens element  1220  is made of glass material and has the object-side surface  1221  and the image-side surface  1222  being both spherical. 
     The third lens element  1230  with positive refractive power has a convex object-side surface  1231  and a concave image-side surface  1232 . The third lens element  1230  is made of glass material and has the object-side surface  1231  and the image-side surface  1232  being both spherical. 
     The fourth lens element  1240  with positive refractive power has a concave object-side surface  1241  and a convex image-side surface  1242 . The fourth lens element  1240  is made of glass material and has the object-side surface  1241  and the image-side surface  1242  being both spherical. 
     The fifth lens element  1250  with positive refractive power has a convex object-side surface  1251  and a convex image-side surface  1252 . The fifth lens element  1250  is made of glass material and has the object-side surface  1251  and the image-side surface  1252  being both spherical. 
     The sixth lens element  1260  with negative refractive power has a concave to object-side surface  1261  and a concave image-side surface  1262 . The sixth lens element  1260  is made of glass material and has the object-side surface  1261  and the image-side surface  1262  being both spherical. 
     The IR-cut filter  1270  and the cover glass  1275  are made of glass material and located between the sixth lens element  1260  and the image surface  1280 , and will not affect the focal length of the imaging lens assembly. The image sensor  1290  is disposed on or near the image surface  1280  of the imaging lens assembly. 
     The detailed optical data of the 12th embodiment are shown in Table 20 below. 
     
       
         
           
               
             
               
                 TABLE 20 
               
             
            
               
                   
               
               
                 11th Embodiment  
               
               
                 f = 7.91 mm, Fno = 1.65, HFOV = 21.4 deg. 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 Sur- 
                   
                   
                   
                   
                   
                   
                   
               
               
                 face  
                   
                 Curvature  
                 Thick- 
                 Mate- 
                   
                 Abbe  
                 Focal  
               
               
                 #  
                   
                 Radius  
                 ness  
                 rial  
                 Index  
                 #  
                 Length 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 0 
                 Object 
                 Plano 
                 Infinity 
                   
                   
                   
                   
               
               
                 1 
                 Lens 1 
                 18.008 
                 0.750 
                 Glass 
                 1.606 
                 43.7 
                 −10.45 
               
               
                 2 
                   
                 4.609 
                 1.085 
                   
                   
                   
                   
               
               
                 3 
                 Lens 2 
                 24.811 
                 1.330 
                 Glass 
                 1.804 
                 46.6 
                 16.04 
               
               
                 4 
                   
                 −26.226 
                 0.700 
                   
                   
                   
                   
               
               
                 5 
                 Ape.  
                 Plano 
                 −0.605 
                   
                   
                   
                   
               
               
                   
                 Stop  
                   
                   
                   
                   
                   
                   
               
               
                 6 
                 Lens 3 
                 6.227 
                 3.420 
                 Glass 
                 1.804 
                 46.6 
                 37.95 
               
               
                 7 
                   
                 5.909 
                 1.045 
                   
                   
                   
                   
               
               
                 8 
                 Lens 4 
                 −13.187 
                 2.550 
                 Glass 
                 1.741 
                 52.6 
                 10.92 
               
               
                 9 
                   
                 −5.426 
                 0.100 
                   
                   
                   
                   
               
               
                 10 
                 Lens 5 
                 11.388 
                 3.580 
                 Glass 
                 1.804 
                 46.6 
                 5.10 
               
               
                 11 
                   
                 −5.501 
                 0.010 
                 Cement 
                 1.514 
                 38.8 
                   
               
               
                 12 
                 Lens 6 
                 −5.499 
                 3.800 
                 Glass 
                 1.847 
                 23.8 
                 −4.57 
               
               
                 13 
                   
                 17.246 
                 1.000 
                   
                   
                   
                   
               
               
                 14 
                 IR-cut 
                 Plano 
                 0.300 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                   
                 filter 
                   
                   
                   
                   
                   
                   
               
               
                 15 
                   
                 Plano 
                 0.300 
                   
                   
                   
                   
               
               
                 16 
                 Cover 
                 Plano 
                 0.400 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                   
                 glass 
                   
                   
                   
                   
                   
                   
               
               
                 17 
                   
                 Plano 
                 1.220 
                   
                   
                   
                   
               
               
                 18 
                 Image 
                 Plano 
                 — 
                   
                   
                   
                   
               
               
                   
               
               
                 Note: 
               
               
                 Reference wavelength is 587.6 nm (d-line). 
               
            
           
         
       
     
     In the 12th embodiment, the definitions of these parameters shown in the following table are the same as those stated in the 1st embodiment with corresponding values for the 12th embodiment, so an explanation in this regard will not be provided again. 
     Moreover, these parameters can be calculated from Table 20 as the following values and satisfy the following conditions: 
     
       
         
           
               
             
               
                   
               
               
                 12th Embodiment 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 f [mm] 
                 7.91 
                 (CT5 + CT6)/(CT1 + CT2 + CT3 + CT4) 
                 0.92 
               
               
                 Fno 
                 1.65 
                 (R5 − R6)/(R5 + R6) 
                 0.03 
               
               
                 HFOV 
                 21.4 
                 ((R9 + R10)/(R9 − R10)) + ((R11 + R12)/ 
                 −0.17 
               
               
                 [deg.] 
                   
                 (R11 − R12)) 
                   
               
               
                 V1 
                 43.7 
                 (|P1| + |P2|)/(|P5| + |P6|) 
                 0.38 
               
               
                 V2 
                 46.6 
                 Y11/Y62 
                 1.19 
               
               
                 V3 
                 46.6 
                 f/EPD 
                 1.65 
               
               
                 V4 
                 52.6 
                 fr/ff 
                 −0.20 
               
               
                 V5 
                 46.6 
                 TL/f 
                 2.65 
               
               
                 V6 
                 23.8 
                 ΣCT/Td 
                 0.87 
               
               
                 Nmax 
                 1.847 
                 Td/ImgH 
                 5.92 
               
               
                 T12/T34 
                 1.04 
                 EPD/ImgH 
                 1.60 
               
               
                 f/R12 
                 0.46 
                 tan(2*HFOV) 
                 0.93 
               
               
                   
               
            
           
         
       
     
     The foregoing description, for the 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.