Patent Publication Number: US-2021191082-A1

Title: Optical imaging lens

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims priority to P.R.C. Patent Application No. 201911326278.7 titled “Optical Imaging Lens,” filed on Dec. 20, 2019, with the State Intellectual Property Office of the People&#39;s Republic of China (SIPO). 
     TECHNICAL FIELD 
     The present disclosure relates to an optical imaging lens, and particularly, to an optical imaging lens for capturing image and video. 
     BACKGROUND 
     In recent years, optical imaging lenses have continuously evolved, and their scope of application has become more extensive. In addition to the requirements for light, thin and short lenses, the design of a small F-number (Fno) is conducive to improving the luminous flux, and a large field of view has gradually become a trend. Besides, in order to improve the pixel and resolution, the image height of the lens must be increased. By using a larger image sensor to accept the imaging rays to meet the needs of high pixels 
     Therefore, how to design an optical imaging lens with a small F-number value, a large field of view and a high image height in addition to the thin and short lens is also the focus of research and development. 
     SUMMARY 
     In light of the abovementioned problems, in addition to the optical imaging lens having higher pixel and imaging quality, reducing the system length of the optical imaging lens, and enlarging the aperture, the field of view and image height of the optical imaging lens are the point of improvement. 
     The present disclosure provides an optical imaging lens for capturing image and video such as the optical imaging lens of cell phones, cameras, tablets and personal digital assistants. By controlling the convex or concave shape of the surfaces of lens elements, the system length of the optical imaging lens can be reduced, and the aperture, the field of view and the image height of the optical imaging lens can be enlarged while improving imaging quality or assembly yield. 
     In the specification, parameters used herein may include: 
     
       
         
           
               
               
             
               
                   
               
               
                 Parameter 
                 Definition 
               
               
                   
               
             
            
               
                 T1 
                 A thickness of the first lens element along the optical axis 
               
               
                 G12 
                 A distance from the image-side surface of the first lens element to the object-side 
               
               
                   
                 surface of the second lens element along the optical axis, i.e., an air gap between 
               
               
                   
                 the first lens element and the second lens element along the optical axis 
               
               
                 T2 
                 A thickness of the second lens element along the optical axis 
               
               
                 G23 
                 A distance from the image-side surface of the second lens element to the object- 
               
               
                   
                 side surface of the third lens element along the optical axis, i.e., an air gap between 
               
               
                   
                 the second lens element and the third lens element along the optical axis 
               
               
                 T3 
                 A thickness of the third lens element along the optical axis 
               
               
                 G34 
                 A distance from the image-side surface of the third lens element to the object-side 
               
               
                   
                 surface of the fourth lens element along the optical axis, i.e., an air gap between the 
               
               
                   
                 third lens element and the fourth lens element along the optical axis 
               
               
                 T4 
                 A thickness of the fourth lens element along the optical axis 
               
               
                 G45 
                 A distance from the image-side surface of the fourth lens element to the object-side 
               
               
                   
                 surface of the fifth lens element along the optical axis, i.e., an air gap between the 
               
               
                   
                 fourth lens element and the fifth lens element along the optical axis 
               
               
                 T5 
                 A thickness of the fifth lens element along the optical axis 
               
               
                 G56 
                 A distance from the image-side surface of the fifth lens element to the object-side 
               
               
                   
                 surface of the sixth lens element along the optical axis, i.e., an air gap between the 
               
               
                   
                 fifth lens element and the sixth lens element along the optical axis 
               
               
                 T6 
                 A thickness of the sixth lens element along the optical axis 
               
               
                 G67 
                 A distance from the image-side surface of the sixth lens element to the object-side 
               
               
                   
                 surface of the seventh lens element along the optical axis, i.e., an air gap between 
               
               
                   
                 the sixth lens element and the seventh lens element along the optical axis 
               
               
                 T7 
                 A thickness of the seventh lens element along the optical axis 
               
               
                 G78 
                 A distance from the image-side surface of the seventh lens element to the object- 
               
               
                   
                 side surface of the eighth lens element along the optical axis, i.e., an air gap between 
               
               
                   
                 the seventh lens element and the eighth lens element along the optical axis 
               
               
                 T8 
                 A thickness of the eighth lens element along the optical axis 
               
               
                 G8F 
                 A distance from the image-side surface of the eighth lens element to the object-side 
               
               
                   
                 surface of the filtering unit along the optical axis 
               
               
                 TTF 
                 A thickness of the filtering unit along the optical axis 
               
               
                 GFP 
                 A distance from the image-side surface of the filtering unit to the image plane along 
               
               
                   
                 the optical axis 
               
               
                 f1 
                 A focal length of the first lens element 
               
               
                 f2 
                 A focal length of the second lens element 
               
               
                 f3 
                 A focal length of the third lens element 
               
               
                 f4 
                 A focal length of the fourth lens element 
               
               
                 f5 
                 A focal length of the fifth lens element 
               
               
                 f6 
                 A focal length of the sixth lens element 
               
               
                 f7 
                 A focal length of the seventh lens element 
               
               
                 f8 
                 A focal length of the eighth lens element 
               
               
                 n1 
                 A refractive index of the first lens element 
               
               
                 n2 
                 A refractive index of the second lens element 
               
               
                 n3 
                 A refractive index of the third lens element 
               
               
                 n4 
                 A refractive index of the fourth lens element 
               
               
                 n5 
                 A refractive index of the fifth lens element 
               
               
                 n6 
                 A refractive index of the sixth lens element 
               
               
                 n7 
                 A refractive index of the seventh lens element 
               
               
                 n8 
                 A refractive index of the eighth lens element 
               
               
                 V1 
                 An Abbe number of the first lens element 
               
               
                 V2 
                 An Abbe number of the second lens element 
               
               
                 V3 
                 An Abbe number of the third lens element 
               
               
                 V4 
                 An Abbe number of the fourth lens element 
               
               
                 V5 
                 An Abbe number of the fifth lens element 
               
               
                 V6 
                 An Abbe number of the sixth lens element 
               
               
                 V7 
                 An Abbe number of the seventh lens element 
               
               
                 V8 
                 An Abbe number of the eighth lens element 
               
               
                 HFOV 
                 A half field of view of the optical imaging lens 
               
               
                 Fno 
                 A F-number of the optical imaging lens 
               
               
                 EFL 
                 A system focal length of the optical imaging lens 
               
               
                 TTL 
                 A distance from the object-side surface of the first lens element to the image plane 
               
               
                   
                 along the optical axis, i.e., a system length of the optical imaging lens 
               
               
                 ALT 
                 A sum of the thicknesses of eight lens elements from the first lens element to the 
               
               
                   
                 eighth lens element along the optical axis, i.e., a sum of T1, T2, T3, T4, T5, T6, 
               
               
                   
                 T7, and T8 
               
               
                 AAG 
                 A sum of seven air gaps from the first lens element to the eighth lens element along 
               
               
                   
                 the optical axis, i.e., a sum of G12, G23, G34, G45, G56, G67, and G78 
               
               
                 BFL 
                 A distance from the image-side surface of the eighth lens element to the image 
               
               
                   
                 plane along the optical axis, i.e., a sum of G8F, TTF and GFP 
               
               
                 TL 
                 A distance from the object-side surface of the first lens element to the image-side 
               
               
                   
                 surface of the eighth lens element along the optical axis 
               
               
                 ImgH 
                 An image height of the optical imaging lens 
               
               
                   
               
            
           
         
       
     
     According to an embodiment of the optical imaging lens of the present disclosure, an optical imaging lens may comprise a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, and an eighth lens element sequentially from an object side to an image side along an optical axis. Each of the first, second, third, fourth, fifth, sixth, seventh, and eighth lens element may have an object-side surface facing toward the object side and allowing imaging rays to pass through as well as an image-side surface facing toward the image side and allowing the imaging rays to pass through. The second lens element has negative refracting power. A periphery region of the image-side surface of the fourth lens element is convex. The fifth lens element has negative refracting power. A periphery region of the image-side surface of the fifth lens element is convex. An optical axis region of the object-side surface of the sixth lens element is concave. The seventh lens element has negative refracting power. Lens elements of the optical imaging lens having refracting power may be composed of the eight lens elements described above. 
     According to another embodiment of the optical imaging lens of the present disclosure, an optical imaging lens may comprise a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, and an eighth lens element sequentially from an object side to an image side along an optical axis. Each of the first, second, third, fourth, fifth, sixth, seventh, and eighth lens element may have an object-side surface facing toward the object side and allowing imaging rays to pass through as well as an image-side surface facing toward the image side and allowing the imaging rays to pass through. The second lens element has negative refracting power. A periphery region of the object-side surface of the third lens element is concave. A periphery region of the image-side surface of the fourth lens element is convex. The fifth lens element has negative refracting power. A periphery region of the image-side surface of the fifth lens element is convex. An optical axis region of the object-side surface of the sixth lens element is concave. Lens elements of the optical imaging lens having refracting power may be composed of the eight lens elements described above. The optical imaging lens may satisfy inequality (1): TTL/ImgH≤1.500. 
     According to another embodiment of the optical imaging lens of the present disclosure, an optical imaging lens may comprise a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, and an eighth lens element sequentially from an object side to an image side along an optical axis. Each of the first, second, third, fourth, fifth, sixth, seventh, and eighth lens element may have an object-side surface facing toward the object side and allowing imaging rays to pass through as well as an image-side surface facing toward the image side and allowing the imaging rays to pass through. An optical axis region of the image-side surface of the first lens element is concave. The second lens element has negative refracting power. A periphery region of the object-side surface of the third lens element is concave. A periphery region of the image-side surface of the fourth lens element is convex. A periphery region of the object-side surface of the fifth lens element is concave. A periphery region of the image-side surface of the fifth lens element is convex. An optical axis region of the object-side surface of the sixth lens element is concave. The seventh lens element has negative refracting power. Lens elements of the optical imaging lens having refracting power may be composed of the eight lens elements described above. 
     In abovementioned exemplary embodiments, some Inequalities could be further selectively taken into consideration as follows: 
         V 1+ V 2+ V 4+ V 6+ V 7≤230.000  Inequality (2);
 
       ( ALT+EFL )/ AAG≤ 4.800  Inequality (3);
 
         ALT /( G 56+ G 78)≤3.500  Inequality (4);
 
         TL /( T 6+ G 67)≤10.000  Inequality (5);
 
       ( T 1+ T 6+ G 78)/( BFL+T 7)≥1.000  Inequality (6);
 
       ( T 1+ G 12+ T 2)/ BFL≥ 1.400  Inequality (7);
 
         AAG /( G 34+ T 4+ G 45)≥2.600  Inequality (8);
 
         AAG/T 6≤3.100  Inequality (9);
 
       ( T 4+ T 8)/( G 12+ T 2)≤2.500  Inequality (10);
 
       ( T 2+ T 4+ T 6)/( G 23+ T 3)≥1.400  Inequality (11);
 
         EFL /( T 5+ T 8)≥5.000  Inequality (12);
 
       ( TL+BFL )/( T 4+ T 7)≥7.300  Inequality (13);
 
         ALT /( T 6+ G 78)≤3.400  Inequality (14);
 
         AAG /( T 1+ T 7+ T 8)≥1.000  Inequality (15);
 
       ( T 3+ T 4+ T 5)/( T 2+ BFL )≥1.000  Inequality (16);
 
       ( G 67+ G 78)/( G 12+ G 23)≥1.600  Inequality (17);
 
       ( G 23+ G 34+ G 45+ G 56)/ G 78≥2.400  Inequality (18);
 
       ( T 1+ T 3+ T 5)/( G 67+ G 78)≥2.400  Inequality (19).
 
     The exemplary limited inequalities listed above can also be combined in any number of different amounts and applied to the embodiments of the present invention, and are not limited to this. In some example embodiments, more details about the convex or concave surface structure, refracting power or chosen material etc. could be incorporated for one specific lens element or broadly for a plurality of lens elements to improve the control for the system performance and/or resolution. It is noted that the details listed herein could be incorporated into the example embodiments if no inconsistency occurs. 
     Through controlling the convex or concave shape of the surfaces and at least one inequality, the optical imaging lens in the example embodiments may maintain good imaging quality, and the system length of the optical imaging lens may be reduced, the aperture may be enlarged, the field of view may be broaden and the image height may be increased. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Exemplary embodiments will be more readily understood from the following detailed description when read in conjunction with the appended drawings, in which: 
         FIG. 1  depicts a cross-sectional view of one single lens element according to one embodiment of the present disclosure; 
         FIG. 2  depicts a schematic view of a relation between a surface shape and an optical focus of a lens element; 
         FIG. 3  depicts a schematic view of a first example of a surface shape and an effective radius of a lens element; 
         FIG. 4  depicts a schematic view of a second example of a surface shape and an effective radius of a lens element; 
         FIG. 5  depicts a schematic view of a third example of a surface shape and an effective radius of a lens element; 
         FIG. 6  depicts a cross-sectional view of the optical imaging lens according to the first embodiment of the present disclosure; 
         FIG. 7  depicts a chart of a longitudinal spherical aberration and other kinds of optical aberrations of the optical imaging lens according to the first embodiment of the present disclosure; 
         FIG. 8  depicts a table of optical data for each lens element of an optical imaging lens according to the first embodiment of the present disclosure; 
         FIG. 9  depicts a table of aspherical data of the optical imaging lens according to the first embodiment of the present disclosure; 
         FIG. 10  depicts a cross-sectional view of the optical imaging lens according to the second embodiment of the present disclosure; 
         FIG. 11  depicts a chart of a longitudinal spherical aberration and other kinds of optical aberrations of the optical imaging lens according to the second embodiment of the present disclosure; 
         FIG. 12  depicts a table of optical data for each lens element of the optical imaging lens according to the second embodiment of the present disclosure; 
         FIG. 13  depicts a table of aspherical data of the optical imaging lens according to the second embodiment of the present disclosure; 
         FIG. 14  depicts a cross-sectional view of the optical imaging lens according to the third embodiment of the present disclosure; 
         FIG. 15  depicts a chart of a longitudinal spherical aberration and other kinds of optical aberrations the optical imaging lens according to the third embodiment of the present disclosure; 
         FIG. 16  depicts a table of optical data for each lens element of the optical imaging lens according to the third embodiment of the present disclosure; 
         FIG. 17  depicts a table of aspherical data of the optical imaging lens according to the third embodiment of the present disclosure; 
         FIG. 18  depicts a cross-sectional view of the optical imaging lens according to the fourth embodiment of the present disclosure; 
         FIG. 19  depicts a chart of a longitudinal spherical aberration and other kinds of optical aberrations of the optical imaging lens according to the fourth embodiment of the present disclosure; 
         FIG. 20  depicts a table of optical data for each lens element of the optical imaging lens according to the fourth embodiment of the present disclosure; 
         FIG. 21  depicts a table of aspherical data of the optical imaging lens according to the fourth embodiment of the present disclosure; 
         FIG. 22  depicts a cross-sectional view of the optical imaging lens according to the fifth embodiment of the present disclosure; 
         FIG. 23  depicts a chart of a longitudinal spherical aberration and other kinds of optical aberrations of the optical imaging lens according to the fifth embodiment of the present disclosure; 
         FIG. 24  depicts a table of optical data for each lens element of the optical imaging lens according to the fifth embodiment of the present disclosure; 
         FIG. 25  depicts a table of aspherical data of the optical imaging lens according to the fifth embodiment of the present disclosure; 
         FIG. 26  depicts a cross-sectional view of the optical imaging lens according to the sixth embodiment of the present disclosure; 
         FIG. 27  depicts a chart of a longitudinal spherical aberration and other kinds of optical aberrations of the optical imaging lens according to the sixth embodiment of the present disclosure; 
         FIG. 28  depicts a table of optical data for each lens element of the optical imaging lens according to the sixth embodiment of the present disclosure; 
         FIG. 29  depicts a table of aspherical data of the optical imaging lens according to the sixth embodiment of the present disclosure; 
         FIG. 30  depicts a cross-sectional view of the optical imaging lens according to the seventh embodiment of the present disclosure; 
         FIG. 31  depicts a chart of a longitudinal spherical aberration and other kinds of optical aberrations of the optical imaging lens according to the seventh embodiment of the present disclosure; 
         FIG. 32  depicts a table of optical data for each lens element of the optical imaging lens according to the seventh embodiment of the present disclosure; 
         FIG. 33  depicts a table of aspherical data of the optical imaging lens according to the seventh embodiment of the present disclosure; 
         FIG. 34  depicts a cross-sectional view of the optical imaging lens according to the eighth embodiment of the present disclosure; 
         FIG. 35  depicts a chart of a longitudinal spherical aberration and other kinds of optical aberrations of the optical imaging lens according to the eighth embodiment of the present disclosure; 
         FIG. 36  depicts a table of optical data for each lens element of the optical imaging lens according to the eighth embodiment of the present disclosure; 
         FIG. 37  depicts a table of aspherical data of the optical imaging lens according to the eighth embodiment of the present disclosure; 
         FIG. 38  depicts a cross-sectional view of the optical imaging lens according to the ninth embodiment of the present disclosure; 
         FIG. 39  depicts a chart of a longitudinal spherical aberration and other kinds of optical aberrations of the optical imaging lens according to the ninth embodiment of the present disclosure; 
         FIG. 40  depicts a table of optical data for each lens element of the optical imaging lens according to the ninth embodiment of the present disclosure; 
         FIG. 41  depicts a table of aspherical data of the optical imaging lens according to the ninth embodiment of the present disclosure; 
         FIG. 42  depicts a cross-sectional view of the optical imaging lens according to the tenth embodiment of the present disclosure; 
         FIG. 43  depicts a chart of a longitudinal spherical aberration and other kinds of optical aberrations of the optical imaging lens according to the tenth embodiment of the present disclosure; 
         FIG. 44  depicts a table of optical data for each lens element of the optical imaging lens according to the tenth embodiment of the present disclosure; 
         FIG. 45  depicts a table of aspherical data of the optical imaging lens according to the ninth embodiment of the present disclosure; 
         FIGS. 46A and 46B  are tables for the values of TTL/ImgH, (ALT+EFL)/AAG, ALT/(G56+G78), TL/(T6+G67), (T1+T6+G78)/(BFL+T7), (T1+G12+T2)/BFL, AAG/(G34+T4+G45), AAG/T6, (T4+T8)/(G12+T2), V1+V2+V4+V6+V7, (T2+T4+T6)/(G23+T3), EFL/(T5+T8), (TL+BFL)/(T4+T7), ALT/(T6+G78), AAG/(T1+T7+T8), (T3+T4+T5)/(T2+BFL), (G67+G78)/(G12+G23), (G23+G34+G45+G56)/G78, and (T1+T3+T5)/(G67+G78) as determined in the first to fifth embodiments. 
     
    
    
     DETAILED DESCRIPTION 
     The terms “optical axis region”, “periphery region”, “concave”, and “convex” used in this specification and claims should be interpreted based on the definition listed in the specification by the principle of lexicographer. 
     In the present disclosure, the optical system may comprise at least one lens element to receive imaging rays that are incident on the optical system over a set of angles ranging from parallel to an optical axis to a half field of view (HFOV) angle with respect to the optical axis. The imaging rays pass through the optical system to produce an image on an image plane. The term “a lens element having positive refracting power (or negative refracting power)” means that the paraxial refracting power of the lens element in Gaussian optics is positive (or negative). The term “an object-side (or image-side) surface of a lens element” refers to a specific region of that surface of the lens element at which imaging rays can pass through that specific region. Imaging rays include at least two types of rays: a chief ray Lc and a marginal ray Lm (as shown in  FIG. 1 ). An object-side (or image-side) surface of a lens element can be characterized as having several regions, including an optical axis region, a periphery region, and, in some cases, one or more intermediate regions, as discussed more fully below. 
       FIG. 1  is a radial cross-sectional view of a lens element  100 . Two referential points for the surfaces of the lens element  100  can be defined: a central point, and a transition point. The central point of a surface of a lens element is a point of intersection of that surface and the optical axis I. As illustrated in  FIG. 1 , a first central point CP 1  may be present on the object-side surface  110  of lens element  100  and a second central point CP 2  may be present on the image-side surface  120  of the lens element  100 . The transition point is a point on a surface of a lens element, at which the line tangent to that point is perpendicular to the optical axis I. The optical boundary OB of a surface of the lens element is defined as a point at which the radially outermost marginal ray Lm passing through the surface of the lens element intersects the surface of the lens element. All transition points lie between the optical axis I and the optical boundary OB of the surface of the lens element. If multiple transition points are present on a single surface, then these transition points are sequentially named along the radial direction of the surface with reference numerals starting from the first transition point. For example, the first transition point, e.g., TP 1 , (closest to the optical axis I), the second transition point, e.g., TP 2 , (as shown in  FIG. 4 ), and the Nth transition point (farthest from the optical axis I). 
     The region of a surface of the lens element from the central point to the first transition point TP 1  is defined as the optical axis region, which includes the central point. The region located radially outside of the farthest Nth transition point from the optical axis I to the optical boundary OB of the surface of the lens element is defined as the periphery region. In some embodiments, there may be intermediate regions present between the optical axis region and the periphery region, with the number of intermediate regions depending on the number of the transition points. 
     The shape of a region is convex if a collimated ray being parallel to the optical axis I and passing through the region is bent toward the optical axis I such that the ray intersects the optical axis Ion the image side A 2  of the lens element. The shape of a region is concave if the extension line of a collimated ray being parallel to the optical axis I and passing through the region intersects the optical axis I on the object side A 1  of the lens element. 
     Additionally, referring to  FIG. 1 , the lens element  100  may also have a mounting portion  130  extending radially outward from the optical boundary OB. The mounting portion  130  is typically used to physically secure the lens element to a corresponding element of the optical system (not shown). Imaging rays do not reach the mounting portion  130 . The structure and shape of the mounting portion  130  are only examples to explain the technologies, and should not be taken as limiting the scope of the present disclosure. The mounting portion  130  of the lens elements discussed below may be partially or completely omitted in the following drawings. 
     Referring to  FIG. 2 , optical axis region Z 1  is defined between central point CP and first transition point TP 1 . Periphery region Z 2  is defined between TP 1  and the optical boundary OB of the surface of the lens element. Collimated ray  211  intersects the optical axis I on the image side A 2  of lens element  200  after passing through optical axis region Z 1 , i.e., the focal point of collimated ray  211  after passing through optical axis region Z 1  is on the image side A 2  of the lens element  200  at point R in  FIG. 2 . Accordingly, since the ray itself intersects the optical axis I on the image side A 2  of the lens element  200 , optical axis region Z 1  is convex. On the contrary, collimated ray  212  diverges after passing through periphery region Z 2 . The extension line EL of collimated ray  212  after passing through periphery region Z 2  intersects the optical axis I on the object side A 1  of lens element  200 , i.e., the focal point of collimated ray  212  after passing through periphery region Z 2  is on the object side A 1  at point M in  FIG. 2 . Accordingly, since the extension line EL of the ray intersects the optical axis I on the object side A 1  of the lens element  200 , periphery region Z 2  is concave. In the lens element  200  illustrated in  FIG. 2 , the first transition point TP 1  is the border of the optical axis region and the periphery region, i.e., TP 1  is the point at which the shape changes from convex to concave. 
     Alternatively, there is another way for a person having ordinary skill in the art to determine whether an optical axis region is convex or concave by referring to the sign of “Radius” (the “R” value), which is the paraxial radius of shape of a lens surface in the optical axis region. The R value is commonly used in conventional optical design software such as Zemax and CodeV. The R value usually appears in the lens data sheet in the software. For an object-side surface, a positive R value defines that the optical axis region of the object-side surface is convex, and a negative R value defines that the optical axis region of the object-side surface is concave. Conversely, for an image-side surface, a positive R value defines that the optical axis region of the image-side surface is concave, and a negative R value defines that the optical axis region of the image-side surface is convex. The result found by using this method should be consistent with the method utilizing intersection of the optical axis by rays/extension lines mentioned above, which determines surface shape by referring to whether the focal point of a collimated ray being parallel to the optical axis I is on the object-side or the image-side of a lens element. As used herein, the terms “a shape of a region is convex (concave),” “a region is convex (concave),” and “a convex- (concave-) region,” can be used alternatively. 
       FIG. 3 ,  FIG. 4  and  FIG. 5  illustrate examples of determining the shape of lens element regions and the boundaries of regions under various circumstances, including the optical axis region, the periphery region, and intermediate regions as set forth in the present specification. 
       FIG. 3  is a radial cross-sectional view of a lens element  300 . As illustrated in  FIG. 3 , only one transition point TP 1  appears within the optical boundary OB of the image-side surface  320  of the lens element  300 . Optical axis region Z 1  and periphery region Z 2  of the image-side surface  320  of lens element  300  are illustrated. The R value of the image-side surface  320  is positive (i.e., R&gt;0). Accordingly, the optical axis region Z 1  is concave. 
     In general, the shape of each region demarcated by the transition point will have an opposite shape to the shape of the adjacent region(s). Accordingly, the transition point will define a transition in shape, changing from concave to convex at the transition point or changing from convex to concave. In  FIG. 3 , since the shape of the optical axis region Z 1  is concave, the shape of the periphery region Z 2  will be convex as the shape changes at the transition point TP 1 . 
       FIG. 4  is a radial cross-sectional view of a lens element  400 . Referring to  FIG. 4 , a first transition point TP 1  and a second transition point TP 2  are present on the object-side surface  410  of lens element  400 . The optical axis region Z 1  of the object-side surface  410  is defined between the optical axis I and the first transition point TP 1 . The R value of the object-side surface  410  is positive (i.e., R&gt;0). Accordingly, the optical axis region Z 1  is convex. 
     The periphery region Z 2  of the object-side surface  410 , which is also convex, is defined between the second transition point TP 2  and the optical boundary OB of the object-side surface  410  of the lens element  400 . Further, intermediate region Z 3  of the object-side surface  410 , which is concave, is defined between the first transition point TP 1  and the second transition point TP 2 . Referring once again to  FIG. 4 , the object-side surface  410  includes an optical axis region Z 1  located between the optical axis I and the first transition point TP 1 , an intermediate region Z 3  located between the first transition point TP 1  and the second transition point TP 2 , and a periphery region Z 2  located between the second transition point TP 2  and the optical boundary OB of the object-side surface  410 . Since the shape of the optical axis region Z 1  is designed to be convex, the shape of the intermediate region Z 3  is concave as the shape of the intermediate region Z 3  changes at the first transition point TP 1 , and the shape of the periphery region Z 2  is convex as the shape of the periphery region Z 2  changes at the second transition point TP 2 . 
       FIG. 5  is a radial cross-sectional view of a lens element  500 . Lens element  500  has no transition point on the object-side surface  510  of the lens element  500 . For a surface of a lens element with no transition point, for example, the object-side surface  510  the lens element  500 , the optical axis region Z 1  is defined as the region between 0-50% of the distance between the optical axis I and the optical boundary OB of the surface of the lens element and the periphery region is defined as the region between 50%-100% of the distance between the optical axis I and the optical boundary OB of the surface of the lens element. Referring to lens element  500  illustrated in  FIG. 5 , the optical axis region Z 1  of the object-side surface  510  is defined between the optical axis I and 50% of the distance between the optical axis I and the optical boundary OB. The R value of the object-side surface  510  is positive (i.e., R&gt;0). Accordingly, the optical axis region Z 1  is convex. For the object-side surface  510  of the lens element  500 , because there is no transition point, the periphery region Z 2  of the object-side surface  510  is also convex. It should be noted that lens element  500  may have a mounting portion (not shown) extending radially outward from the periphery region Z 2 . 
     According to an embodiment of the optical imaging lens of the present disclosure, an optical imaging lens may comprise a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, and an eighth lens element sequentially from an object side to an image side along an optical axis. Each of the first, second, third, fourth, fifth, sixth, seventh, and eighth lens element may have an object-side surface facing toward the object side and allowing imaging rays to pass through as well as an image-side surface facing toward the image side and allowing the imaging rays to pass through. The second lens element has negative refracting power. A periphery region of the image-side surface of the fourth lens element is convex. The fifth lens element has negative refracting power. A periphery region of the image-side surface of the fifth lens element is convex. An optical axis region of the object-side surface of the sixth lens element is concave. The seventh lens element has negative refracting power. Lens elements of the optical imaging lens having refracting power may be composed of the eight lens elements described above. Accordingly, this embodiment can effectively make the entire optical imaging lens system have good imaging quality while increasing the luminous flux and the field of view. 
     According to another embodiment of the optical imaging lens of the present disclosure, an optical imaging lens may comprise a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, and an eighth lens element sequentially from an object side to an image side along an optical axis. Each of the first, second, third, fourth, fifth, sixth, seventh, and eighth lens element may have an object-side surface facing toward the object side and allowing imaging rays to pass through as well as an image-side surface facing toward the image side and allowing the imaging rays to pass through. The second lens element has negative refracting power. A periphery region of the object-side surface of the third lens element is concave. A periphery region of the image-side surface of the fourth lens element is convex. The fifth lens element has negative refracting power. A periphery region of the image-side surface of the fifth lens element is convex. An optical axis region of the object-side surface of the sixth lens element is concave. Lens elements of the optical imaging lens having refracting power may be composed of the eight lens elements described above. The optical imaging lens may satisfy inequality (1): TTL/ImgH≤1.500. Accordingly, this embodiment can effectively shorten the system length of the optical imaging lens, and make the optical imaging lens have a larger image height, so that the image sensor can receive more imaging rays, so as to appropriately increase the optical imaging quality. The further restriction for TTL/ImgH defined below may constitute better configuration: 1.000≤TTL/ImgH≤1.500. 
     According to another embodiment of the optical imaging lens of the present disclosure, an optical imaging lens may comprise a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, and an eighth lens element sequentially from an object side to an image side along an optical axis. Each of the first, second, third, fourth, fifth, sixth, seventh, and eighth lens element may have an object-side surface facing toward the object side and allowing imaging rays to pass through as well as an image-side surface facing toward the image side and allowing the imaging rays to pass through. An optical axis region of the image-side surface of the first lens element is concave. The second lens element has negative refracting power. A periphery region of the object-side surface of the third lens element is concave. A periphery region of the image-side surface of the fourth lens element is convex. A periphery region of the object-side surface of the fifth lens element is concave. A periphery region of the image-side surface of the fifth lens element is convex. An optical axis region of the object-side surface of the sixth lens element is concave. The seventh lens element has negative refracting power. Lens elements of the optical imaging lens having refracting power may be composed of the eight lens elements described above. Accordingly, this embodiment can achieve the objectives of correcting aberrations of the optical system and reducing distortion 
     In some embodiments, the optical imaging lens of the present disclosure may be produced with appropriate material configuration and satisfy inequality (2): V1+V2+V4+V6+V7≤230.000, such that the optical imaging lens can effectively improve the chromatic aberration. The further restriction for V1+V2+V4+V6+V7 defined below may constitute better configuration: 165.000≤V1+V2+V4+V6+V7230.000. 
     In some embodiments of the optical imaging lens of the present disclosure, to shorten the system length of optical imaging lens and ensure imaging quality, reducing the air gap between lens elements or moderately reducing the thickness of lens elements can be as a means; however, the difficulty of manufacture should be considered. Accordingly, the optical imaging lens satisfies the below Inequalities may constitute better configuration: 
     The further restriction for Inequality (3), (ALT+EFL)/AAG≤4.800, defined below may constitute better configuration: 2.800≤(ALT+EFL)/AAG≤4.800. 
     The further restriction for Inequality (4), ALT/(G56+G78)≤3.500, defined below may constitute better configuration: 2.200≤ALT/(G56+G78)≤3.500. 
     The further restriction for Inequality (5), TL/(T6+G67)≤10.000, defined below may constitute better configuration: 3.300≤TL/(T6+G67)≤10.000. 
     The further restriction for Inequality (6), (T1+T6+G78)/(BFL+T7)≥1.000, defined below may constitute better configuration: 1.000≤(T1+T6+G78)/(BFL+T7)≤3.000. 
     The further restriction for Inequality (7), (T1+G12+T2)/BFL≥1.400, defined below may constitute better configuration: 1.400≤(T1+G12+T2)/BFL≤2.300. 
     The further restriction for Inequality (8), AAG/(G34+T4+G45)≥2.600, defined below may constitute better configuration: 2.600≤AAG/(G34+T4+G45)≤3.500. 
     The further restriction for Inequality (9), AAG/T6≤3.100, defined below may constitute better configuration: 1.700≤AAG/T6≤3.100. 
     The further restriction for Inequality (10), (T4+T8)/(G12+T2)≤2.500, defined below may constitute better configuration: 0.800≤(T4+T8)/(G12+T2)≤2.500. 
     The further restriction for Inequality (11), (T2+T4+T6)/(G23+T3)≥1.400, defined below may constitute better configuration: 1.400≤(T2+T4+T6)/(G23+T3)≤2.400. 
     The further restriction for Inequality (12), EFL/(T5+T8)≥5.000, defined below may constitute better configuration: 5.000≤EFL/(T5+T8)≤12.000. 
     The further restriction for Inequality (13), (TL+BFL)/(T4+T7)≥7.300, defined below may constitute better configuration: 7.300≤(TL+BFL)/(T4+T7)≤13.500. 
     The further restriction for Inequality (14), ALT/(T6+G78)≤3.400, defined below may constitute better configuration: 1.700≤ALT/(T6+G78)≤3.400. 
     The further restriction for Inequality (15), AAG/(T1+T7+T8)≤1.000, defined below may constitute better configuration: 1.000≤AAG/(T1+T7+T8)≤3.000. 
     The further restriction for Inequality (16), (T3+T4+T5)/(T2+BFL)≥1.000, defined below may constitute better configuration: 1.000≤(T3+T4+T5)/(T2+BFL)≤1.900. 
     The further restriction for Inequality (17), (G67+G78)/(G12+G23)≥1.600, defined below may constitute better configuration: 1.600≤(G67+G78)/(G12+G23)≤5.200. 
     The further restriction for Inequality (18), (G23+G34+G45+G56)/G78≤2.400, defined below may constitute better configuration: 0.500≤(G23+G34+G45+G56)/G78≤2.400. 
     The further restriction for Inequality (19), (T1+T3+T5)/(G67+G78)≤2.400, defined below may constitute better configuration: 0.900≤(T1+T3+T5)/(G67+G78)≤2.400. 
     In addition, any combination of the parameters of the embodiment may be selected to increase the optical imaging lens limitation to facilitate the optical imaging lens design of the same architecture of the present invention. 
     In consideration of the non-predictability of design for the optical system, while the optical imaging lens may satisfy any one of inequalities described above, the optical imaging lens according to the disclosure herein may achieve a shortened system length of the optical imaging lens and an enlarged aperture, improve an imaging quality or assembly yield, and effectively improve drawbacks of a typical optical imaging lens. 
     The range of values within the maximum and minimum values derived from the combined ratios of the optical parameters can be implemented according to the following embodiments. 
     Reference is now made to  FIGS. 6-9 .  FIG. 6  illustrates an example cross-sectional view of an optical imaging lens  1  according to a first example embodiment.  FIG. 7  shows example charts of a longitudinal spherical aberration and other kinds of optical aberrations of the optical imaging lens  1  according to the first example embodiment.  FIG. 8  illustrates an example table of optical data of each lens element of the optical imaging lens  1  according to the first example embodiment.  FIG. 9  depicts an example table of aspherical data of the optical imaging lens  1  according to the first example embodiment. 
     As shown in  FIG. 6 , the optical imaging lens  1  of the present embodiment, in an order from an object side A 1  to an image side A 2  along an optical axis, may comprise an aperture stop STO, a first lens element L 1 , a second lens element L 2 , a third lens element L 3 , a fourth lens element L 4 , a fifth lens element L 5 , a sixth lens element L 6 , a seventh lens element L 7 , and an eighth lens element L 8 . A filtering unit TF and an image plane IMA of an image sensor (not shown) may be positioned at the image side A 2  of the optical imaging lens  1 . Each of the first, second, third, fourth, fifth, sixth, seventh, and eighth lens elements L 1 , L 2 , L 3 , L 4 , L 5 , L 6 , L 7 , L 8  and the filtering unit TF may comprise an object-side surface L 1 A 1 /L 2 A 1 /L 3 A 1 /L 4 A 1 /L 5 A 1 /L 6 A 1 /L 7 A 1 /L 8 A 1 /TFA 1  facing toward the object side A 1  and an image-side surface L 1 A 2 /L 2 A 2 /L 3 A 2 /L 4 A 2 /L 5 A 2 /L 6 A 2 /L 7 A 2 /L 8 A 2 /TFA 2  facing toward the image side A 2 . The example embodiment of the illustrated filtering unit TF may be positioned between the eighth lens element L 8  and the image plane IMA. The filtering unit TF may be a filter for preventing light with certain wavelength from reaching the mage plane IMA and affecting imaging quality. 
     Exemplary embodiments of each lens element of the optical imaging lens  1  will now be described with reference to the drawings. The lens elements L 1 , L 2 , L 3 , L 4 , L 5 , L 6 , L 7 , and L 8  of the optical imaging lens  1  may be constructed using plastic materials in this embodiment, which can reduce the weight of the lens elements and save costs, but not limited to this. 
     An example embodiment of the first lens element L 1  may have positive refracting power. Both of the optical axis region L 1 A 1 C and the periphery region L 1 A 1 P of the object-side surface L 1 A 1  of the first lens element L 1  may be convex. Both of the optical axis region L 1 A 2 C and the periphery region L 1 A 2 P of the image-side surface L 1 A 2  of the first lens element L 1  may be concave. 
     An example embodiment of the second lens element L 2  may have negative refracting power. Both of the optical axis region L 2 A 1 C and the periphery region L 2 A 1 P of the object-side surface L 2 A 1  of the second lens element L 2  may be convex. Both of the optical axis region L 2 A 2 C and the periphery region L 2 A 2 P of the image-side surface L 2 A 2  of the second lens element L 2  may be concave. 
     An example embodiment of the third lens element L 3  may have positive refracting power. The optical axis region L 3 A 1 C of the object-side surface L 3 A 1  of the third lens element L 3  may be convex. The periphery region L 3 A 1 P of the object-side surface L 3 A 1  of the third lens element L 3  may be concave. Both of the optical axis region L 3 A 2 C and the periphery region L 3 A 2 P of the image-side surface L 3 A 2  of the third lens element L 3  may be convex. 
     An example embodiment of the fourth lens element L 4  may have positive refracting power. The optical axis region L 4 A 1 C of the object-side surface L 4 A 1  of the fourth lens element L 4  may be convex. The periphery region L 4 A 1 P of the object-side surface L 4 A 1  of the fourth lens element L 4  may be concave. Both of the optical axis region L 4 A 2 C and the periphery region L 4 A 2 P of the image-side surface L 4 A 2  of the fourth lens element L 4  may be convex. 
     An example embodiment of the fifth lens element L 5  may have negative refracting power. Both of the optical axis region L 5 A 1 C and the periphery region L 5 A 1 P of the object-side surface L 5 A 1  of the fifth lens element L 5  may be concave. Both of the optical axis region L 5 A 2 C and the periphery region L 5 A 2 P of the image-side surface L 5 A 2  of the fifth lens element L 5  may be convex. 
     An example embodiment of the sixth lens element L 6  may have positive refracting power. Both of the optical axis region L 6 A 1 C and the periphery region L 6 A 1 P of the object-side surface L 6 A 1  of the sixth lens element L 6  may be concave. Both of the optical axis region L 6 A 2 C and the periphery region L 6 A 2 P of the image-side surface L 6 A 2  of the sixth lens element L 6  may be convex. 
     An example embodiment of the seventh lens element L 7  may have negative refracting power. The optical axis region L 7 A 1 C of the object-side surface L 7 A 1  of the seventh lens element L 7  may be convex. The periphery region L 7 A 1 P of the object-side surface L 7 A 1  of the seventh lens element L 7  may be concave. The optical axis region L 7 A 2 C of the image-side surface L 7 A 2  of the seventh lens element L 7  may be concave. The periphery region L 7 A 2 P of the image-side surface L 7 A 2  of the seventh lens element L 7  may be convex. 
     An example embodiment of the eighth lens element L 8  may have negative refracting power. Both of the optical axis region L 8 A 1 C and the periphery region L 8 A 1 P of the object-side surface L 8 A 1  of the eighth lens element L 8  may be concave. The optical axis region L 8 A 2 C of the image-side surface L 8 A 2  of the eighth lens element L 8  may be concave. The periphery region L 8 A 2 P of the image-side surface L 8 A 2  of the eighth lens element L 8  may be convex. 
     Lens elements of the optical imaging lens having refracting power may be composed of the first lens element L 1 , the second lens element L 2 , the third lens element L 3 , the fourth lens element L 4 , the fifth lens element L 5 , the sixth lens element L 6 , the seventh lens element L 7 , and the eighth lens element L 8 . 
     The total 16 aspherical surfaces including the object-side surface L 1 A 1  and the image-side surface L 1 A 2  of the first lens element L 1 , the object-side surface L 2 A 1  and the image-side surface L 2 A 2  of the second lens element L 2 , the object-side surface L 3 A 1  and the image-side surface L 3 A 2  of the third lens element L 3 , the object-side surface L 4 A 1  and the image-side surface L 4 A 2  of the fourth lens element L 4 , the object-side surface L 5 A 1  and the image-side surface L 5 A 2  of the fifth lens element L 5 , the object-side surface L 6 A 1  and the image-side surface L 6 A 2  of the sixth lens element L 6 , the object-side surface L 7 A 1  and the image-side surface L 7 A 2  of the seventh lens element L 7 , and the object-side surface L 8 A 1  and the image-side surface L 8 A 2  of the eighth lens element L 8  may all be defined by the following aspherical formula: 
     
       
         
           
             
               Z 
                
               
                 ( 
                 Y 
                 ) 
               
             
             = 
             
               
                 
                   
                     Y 
                     2 
                   
                   R 
                 
                 / 
                 
                   ( 
                   
                     1 
                     + 
                     
                       
                         1 
                         - 
                         
                           
                             ( 
                             
                               1 
                               + 
                               K 
                             
                             ) 
                           
                            
                           
                             
                               Y 
                               2 
                             
                             
                               R 
                               2 
                             
                           
                         
                       
                     
                   
                   ) 
                 
               
               + 
               
                 
                   ∑ 
                   
                     i 
                     = 
                     1 
                   
                   n 
                 
                  
                 
                   
                     a 
                     
                       2 
                        
                       i 
                     
                   
                   × 
                   
                     Y 
                     
                       2 
                        
                       i 
                     
                   
                 
               
             
           
         
       
         
         
           
             wherein, 
             R represents the radius of curvature of the surface of the lens element; 
             Z represents the depth of the aspherical surface (the perpendicular distance between the point of the aspherical surface at a distance Y from the optical axis and the tangent plane of the vertex on the optical axis of the aspherical surface); 
             Y represents the perpendicular distance between the point of the aspherical surface and the optical axis; 
             K represents a conic constant; and 
             a 2i  represents an aspherical coefficient of 2i th  level. 
           
         
       
    
     The values of each aspherical parameter are shown in  FIG. 9 . 
       FIG. 7( a )  shows a longitudinal spherical aberration for three representative wavelengths (470 nm, 555 nm and 650 nm), wherein the vertical axis of  FIG. 7( a )  defines the field of view.  FIG. 7( b )  shows the field curvature aberration in the sagittal direction for three representative wavelengths (470 nm, 555 nm and 650 nm), wherein the vertical axis of  FIG. 7( b )  defines the image height.  FIG. 7( c )  shows the field curvature aberration in the tangential direction for three representative wavelengths (470 nm, 555 nm and 650 nm), wherein the vertical axis of  FIG. 7( c )  defines the image height.  FIG. 7( d )  shows a variation of the distortion aberration, wherein the vertical axis of  FIG. 7( d )  defines the image height. The three curves with different wavelengths (470 nm, 555 nm and 650 nm) may represent that off-axis light with respect to these wavelengths may be focused around an image point. From the vertical deviation of each curve shown in  FIG. 7( a ) , the offset of the off-axis light relative to the image point may be within ±0.025 mm. Therefore, the first embodiment may improve the longitudinal spherical aberration with respect to different wavelengths. Referring to  FIG. 7( b ) , the focus variation with respect to the three different wavelengths (470 nm, 555 nm and 650 nm) in the whole field may fall within ±0.03 mm. Referring to  FIG. 7( c ) , the focus variation with respect to the three different wavelengths (470 nm, 555 nm and 650 nm) in the whole field may fall within ±0.04 mm. Referring to  FIG. 7( d ) , and more specifically the horizontal axis of  FIG. 7( d ) , the variation of the distortion aberration may be within ±5%. 
     As shown in  FIG. 8 , the distance from the object-side surface L 1 A 1  of the first lens element L 1  to the image plane IMA along the optical axis (TTL), the system length, may be about 5.201 mm, F-number (Fno) may be about 1.599, the half field of view (HFOV) may be about 46.216 degrees, the system focal length (EFL) of the optical imaging lens  1  may be about 3.719 mm, and the image height of the optical imaging lens  1  (ImgH) may be about 3.728 mm. In accordance with these values, the present embodiment may provide an optical imaging lens  1  having a shortened system length of the optical imaging lens and an increased field of view while improving assembly yield. 
     Please refer to  FIG. 46A  for the values of TTL/ImgH, (ALT+EFL)/AAG, ALT/(G56+G78), TL/(T6+G67), (T1+T6+G78)/(BFL+T7), (T1+G12+T2)/BFL, AAG/(G34+T4+G45), AAG/T6, (T4+T8)/(G12+T2), V1+V2+V4+V6+V7, (T2+T4+T6)/(G23+T3), EFL/(T5+T8), (TL+BFL)/(T4+T7), ALT/(T6+G78), AAG/(T1+T7+T8), (T3+T4+T5)/(T2+BFL), (G67+G78)/(G12+G23), (G23+G34+G45+G56)/G78, and (T1+T3+T5)/(G67+G78) of the present embodiment. 
     Reference is now made to  FIGS. 10-13 .  FIG. 10  illustrates an example cross-sectional view of an optical imaging lens  2  according to a second example embodiment.  FIG. 11  shows example charts of a longitudinal spherical aberration and other kinds of optical aberrations of the optical imaging lens  2  according to the second example embodiment.  FIG. 12  shows an example table of optical data of each lens element of the optical imaging lens  2  according to the second example embodiment.  FIG. 13  shows an example table of aspherical data of the optical imaging lens  2  according to the second example embodiment. 
     As shown in  FIG. 10 , the optical imaging lens  2  of the present embodiment, in an order from an object side A 1  to an image side A 2  along an optical axis, may comprise an aperture stop STO, a first lens element L 1 , a second lens element L 2 , a third lens element L 3 , a fourth lens element L 4 , a fifth lens element L 5 , a sixth lens element L 6 , a seventh lens element L 7 , and an eighth lens element L 8 . 
     The arrangement of the convex or concave surface structures, including the object-side surfaces L 1 A 1 , L 2 A 1 , L 3 A 1 , L 4 A 1 , L 5 A 1 , L 6 A 1 , L 7 A 1 , L 8 A 1  and the image-side surfaces L 1 A 2 , L 2 A 2 , L 3 A 2 , L 5 A 2 , L 6 A 2 , L 7 A 2 , L 8 A 2  may be generally similar to the optical imaging lens  1 , but the differences between the optical imaging lens  1  and the optical imaging lens  2  may include the refracting power of the fourth lens element L 4 , the concave or convex surface structure of the image-side surface L 4 A 2 , a radius of curvature, a thickness, aspherical data, and/or an system focal length of each lens element. More specifically, the fourth lens element L 4  may have negative refracting power, and the optical axis region L 4 A 2 C of the image-side surface L 4 A 2  of the fourth lens element L 4  may be concave in the second embodiment. 
     Here, in the interest of clearly showing the drawings of the present embodiment, only the surface shapes which are different from that in the first embodiment may be labeled. Please refer to  FIG. 12  for the optical characteristics of each lens element in the optical imaging lens  2  of the present embodiment. 
     From the vertical deviation of each curve shown in  FIG. 11( a ) , the offset of the off-axis light relative to the image point may be within ±0.03 mm. Referring to  FIG. 11( b ) , the focus variation with respect to the three different wavelengths (470 nm, 555 nm and 650 nm) in the whole field may fall within ±0.03 mm. Referring to  FIG. 11( c ) , the focus variation with respect to the three different wavelengths (470 nm, 555 nm and 650 nm) in the whole field may fall within ±0.06 mm. Referring to  FIG. 11( d ) , the variation of the distortion aberration of the optical imaging lens  2  may be within ±4.5%. 
     In comparison with the first embodiment, the distortion aberration may be smaller, the system length may be shorter, and the half field of view and the image height may be larger in the second embodiment as shown in  FIG. 11  and  FIG. 12 . 
     Please refer to  42 A for the values of TTL/ImgH, (ALT+EFL)/AAG, ALT/(G56+G78), TL/(T6+G67), (T1+T6+G78)/(BFL+T7), (T1+G12+T2)/BFL, AAG/(G34+T4+G45), AAG/T6, (T4+T8)/(G12+T2), V1+V2+V4+V6+V7, (T2+T4+T6)/(G23+T3), EFL/(T5+T8), (TL+BFL)/(T4+T7), ALT/(T6+G78), AAG/(T1+T7+T8), (T3+T4+T5)/(T2+BFL), (G67+G78)/(G12+G23), (G23+G34+G45+G56)/G78, and (T1+T3+T5)/(G67+G78) of the present embodiment. 
     Reference is now made to  FIGS. 14-17 .  FIG. 14  illustrates an example cross-sectional view of an optical imaging lens  3  according to a third example embodiment.  FIG. 15  shows example charts of a longitudinal spherical aberration and other kinds of optical aberrations of the optical imaging lens  3  according to the third example embodiment.  FIG. 16  shows an example table of optical data of each lens element of the optical imaging lens  3  according to the third example embodiment.  FIG. 17  shows an example table of aspherical data of the optical imaging lens  3  according to the third example embodiment. 
     As shown in  FIG. 14 , the optical imaging lens  3  of the present embodiment, in an order from an object side A 1  to an image side A 2  along an optical axis, may comprise an aperture stop STO, a first lens element L 1 , a second lens element L 2 , a third lens element L 3 , a fourth lens element L 4 , a fifth lens element L 5 , a sixth lens element L 6 , a seventh lens element L 7 , and an eighth lens element L 8 . 
     The arrangement of the convex or concave surface structures, including the object-side surfaces L 1 A 1 , L 2 A 1 , L 3 A 1 , L 4 A 1 , L 5 A 1 , L 6 A 1 , L 7 A 1 , L 8 A 1  and the image-side surfaces L 1 A 2 , L 2 A 2 , L 3 A 2 , L 5 A 2 , L 6 A 2 , L 7 A 2 , L 8 A 2  may be generally similar to the optical imaging lens  1 , but the differences between the optical imaging lens  1  and the optical imaging lens  3  may include the refracting power of the fourth lens element L 4 , the concave or convex surface structures of the image-side surface L 4 A 2 , a thickness, aspherical data, and/or an system focal length of each lens element. More specifically, the fourth lens element L 4  may have negative refracting power, and the optical axis region L 4 A 2 C of the image-side surface L 4 A 2  of the fourth lens element L 4  may be concave in the third embodiment. 
     Here, in the interest of clearly showing the drawings of the present embodiment, only the surface shapes which are different from that in the first embodiment may be labeled. Please refer to  FIG. 16  for the optical characteristics of each lens element in the optical imaging lens  3  of the present embodiment. 
     From the vertical deviation of each curve shown in  FIG. 15( a ) , the offset of the off-axis light relative to the image point may be within ±0.08 mm. Referring to  FIG. 15( b ) , the focus variation with respect to the three different wavelengths (470 nm, 555 nm and 650 nm) in the whole field may fall within ±0.08 mm. Referring to  FIG. 15( c ) , the focus variation with respect to the three different wavelengths (470 nm, 555 nm and 650 nm) in the whole field may fall within ±0.18 mm. Referring to  FIG. 15( d ) , the variation of the distortion aberration of the optical imaging lens  3  may be within ±10%. 
     In comparison with the first embodiment, the half field of view and the image height may be larger in the third embodiment as shown in  FIG. 15  and  FIG. 16 . 
     Please refer to  FIG. 42A  for the values of TTL/ImgH, (ALT+EFL)/AAG, ALT/(G56+G78), TL/(T6+G67), (T1+T6+G78)/(BFL+T7), (T1+G12+T2)/BFL, AAG/(G34+T4+G45), AAG/T6, (T4+T8)/(G12+T2), V1+V2+V4+V6+V7, (T2+T4+T6)/(G23+T3), EFL/(T5+T8), (TL+BFL)/(T4+T7), ALT/(T6+G78), AAG/(T1+T7+T8), (T3+T4+T5)/(T2+BFL), (G67+G78)/(G12+G23), (G23+G34+G45+G56)/G78, and (T1+T3+T5)/(G67+G78) of the present embodiment. 
     Reference is now made to  FIGS. 18-21 .  FIG. 18  illustrates an example cross-sectional view of an optical imaging lens  4  according to a fourth example embodiment.  FIG. 19  shows example charts of a longitudinal spherical aberration and other kinds of optical aberrations of the optical imaging lens  4  according to the fourth example embodiment.  FIG. 20  shows an example table of optical data of each lens element of the optical imaging lens  4  according to the fourth example embodiment.  FIG. 21  shows an example table of aspherical data of the optical imaging lens  4  according to the fourth example embodiment. 
     As shown in  FIG. 18 , the optical imaging lens  4  of the present embodiment, in an order from an object side A 1  to an image side A 2  along an optical axis, may comprise an aperture stop STO, a first lens element L 1 , a second lens element L 2 , a third lens element L 3 , a fourth lens element L 4 , a fifth lens element L 5 , a sixth lens element L 6 , a seventh lens element L 7 , and an eighth lens element L 8 . 
     The arrangement of the convex or concave surface structures, including the object-side surfaces L 1 A 1 , L 2 A 1 , L 4 A 1 , L 5 A 1 , L 6 A 1 , L 7 A 1 , and the image-side surfaces L 1 A 2 , L 2 A 2 , L 3 A 2 , L 5 A 2 , L 6 A 2 , L 7 A 2 , L 8 A 2  may be generally similar to the optical imaging lens  1 , but the differences between the optical imaging lens  1  and the optical imaging lens  4  may include the refracting power of the fourth lens element L 4 , the concave or convex surface structures of the object-side surfaces L 3 A 1 , L 8 A 1  and the image-side surface L 4 A 2 , a radius of curvature, a thickness, aspherical data, and/or an system focal length of each lens element. More specifically, the fourth lens element L 4  may have negative refracting power, the optical image region L 3 A 1 C of the object-side surface L 3 A 1  of the third lens element L 3  may be concave, the optical axis region L 4 A 2 C of the image-side surface L 4 A 2  of the fourth lens element L 4  may be concave, and the periphery region L 8 A 1 P of the object-side surface L 8 A 1  of the eighth lens element L 8  may be convex in the fourth embodiment. 
     Here, in the interest of clearly showing the drawings of the present embodiment, only the surface shapes which are different from that in the first embodiment may be labeled. Please refer to  FIG. 20  for the optical characteristics of each lens element in the optical imaging lens  4  of the present embodiment. 
     From the vertical deviation of each curve shown in  FIG. 19( a ) , the offset of the off-axis light relative to the image point may be within ±0.025 mm. Referring to  FIG. 19( b ) , the focus variation with respect to the three different wavelengths (470 nm, 555 nm and 650 nm) in the whole field may fall within ±0.03 mm. Referring to  FIG. 19( c ) , the focus variation with respect to the three different wavelengths (470 nm, 555 nm and 650 nm) in the whole field may fall within ±0.04 mm. Referring to  FIG. 19( d ) , the variation of the distortion aberration of the optical imaging lens  4  may be within ±8%. 
     In comparison with the first embodiment, the image height may be larger, and the system length may be shorter in the fourth embodiment as shown in  FIG. 19  and  FIG. 20 . 
     Please refer to  FIG. 42A  for the values of TTL/ImgH, (ALT+EFL)/AAG, ALT/(G56+G78), TL/(T6+G67), (T1+T6+G78)/(BFL+T7), (T1+G12+T2)/BFL, AAG/(G34+T4+G45), AAG/T6, (T4+T8)/(G12+T2), V1+V2+V4+V6+V7, (T2+T4+T6)/(G23+T3), EFL/(T5+T8), (TL+BFL)/(T4+T7), ALT/(T6+G78), AAG/(T1+T7+T8), (T3+T4+T5)/(T2+BFL), (G67+G78)/(G12+G23), (G23+G34+G45+G56)/G78, and (T1+T3+T5)/(G67+G78) of the present embodiment. 
     Reference is now made to  FIGS. 22-25 .  FIG. 22  illustrates an example cross-sectional view of an optical imaging lens  5  according to a fifth example embodiment.  FIG. 23  shows example charts of a longitudinal spherical aberration and other kinds of optical aberrations of the optical imaging lens  5  according to the fifth example embodiment.  FIG. 24  shows an example table of optical data of each lens element of the optical imaging lens  5  according to the fifth example embodiment.  FIG. 25  shows an example table of aspherical data of the optical imaging lens  5  according to the fifth example embodiment. 
     As shown in  FIG. 22 , the optical imaging lens  5  of the present embodiment, in an order from an object side A 1  to an image side A 2  along an optical axis, may comprise an aperture stop STO, a first lens element L 1 , a second lens element L 2 , a third lens element L 3 , a fourth lens element L 4 , a fifth lens element L 5 , a sixth lens element L 6 , and a seventh lens element L 7 . 
     The arrangement of the convex or concave surface structures, including the object-side surfaces L 1 A 1 , L 2 A 1 , L 3 A 1 , L 5 A 1 , L 6 A 1 , L 7 A 1 , L 8 A 1  and the image-side surfaces L 1 A 2 , L 2 A 2 , L 3 A 2 , L 4 A 2 , L 5 A 2 , L 6 A 2 , L 7 A 2 , L 8 A 2  may be generally similar to the optical imaging lens  1 , but the differences between the optical imaging lens  1  and the optical imaging lens  5  may include the refracting power of the sixth lens element L 6 , the concave or convex surface structure of the object-side surface L 4 A 1 , a radius of curvature, a thickness, aspherical data, and/or an system focal length of each lens element. More specifically, the sixth lens element L 6  may have negative refracting power, and the optical axis region L 4 A 1 C of the object-side surface L 4 A 1  of the fourth lens element L 4  may be concave in the fifth embodiment. 
     Here, in the interest of clearly showing the drawings of the present embodiment, only the surface shapes which are different from that in the first embodiment may be labeled. Please refer to  FIG. 24  for the optical characteristics of each lens element in the optical imaging lens  5  of the present embodiment. 
     From the vertical deviation of each curve shown in  FIG. 23( a ) , the offset of the off-axis light relative to the image point may be within ±0.05 mm. Referring to  FIG. 23( b ) , the focus variation with respect to the three different wavelengths (470 nm, 555 nm and 650 nm) in the whole field may fall within ±0.05 mm. Referring to  FIG. 23( c ) , the focus variation with respect to the three different wavelengths (470 nm, 555 nm and 650 nm) in the whole field may fall within ±0.05 mm. Referring to  FIG. 23( d ) , the variation of the distortion aberration of the optical imaging lens  5  may be within ±8%. 
     In comparison with the first embodiment, the optical imaging lens  5  may be easier to be manufactured, such that yield thereof may be higher. 
     Please refer to  FIG. 46A  for the values of TTL/ImgH, (ALT+EFL)/AAG, ALT/(G56+G78), TL/(T6+G67), (T1+T6+G78)/(BFL+T7), (T1+G12+T2)/BFL, AAG/(G34+T4+G45), AAG/T6, (T4+T8)/(G12+T2), V1+V2+V4+V6+V7, (T2+T4+T6)/(G23+T3), EFL/(T5+T8), (TL+BFL)/(T4+T7), ALT/(T6+G78), AAG/(T1+T7+T8), (T3+T4+T5)/(T2+BFL), (G67+G78)/(G12+G23), (G23+G34+G45+G56)/G78, and (T1+T3+T5)/(G67+G78) the present embodiment. 
     Reference is now made to  FIGS. 26-29 .  FIG. 26  illustrates an example cross-sectional view of an optical imaging lens  6  according to a sixth example embodiment.  FIG. 27  shows example charts of a longitudinal spherical aberration and other kinds of optical aberrations of the optical imaging lens  6  according to the sixth example embodiment.  FIG. 28  shows an example table of optical data of each lens element of the optical imaging lens  6  according to the sixth example embodiment.  FIG. 29  shows an example table of aspherical data of the optical imaging lens  6  according to the sixth example embodiment. 
     As shown in  FIG. 26 , the optical imaging lens  6  of the present embodiment, in an order from an object side A 1  to an image side A 2  along an optical axis, may comprise an aperture stop STO, a first lens element L 1 , a second lens element L 2 , a third lens element L 3 , a fourth lens element L 4 , a fifth lens element L 5 , a sixth lens element L 6 , a seventh lens element L 7 , and an eighth lens element L 8 . 
     The arrangement of the convex or concave surface structures, including the object-side surfaces L 1 A 1 , L 2 A 1 , L 4 A 1 , L 5 A 1 , L 6 A 1 , L 7 A 1 , L 8 A 1  and the image-side surfaces L 1 A 2 , L 2 A 2 , L 3 A 2 , L 5 A 2 , L 6 A 2 , L 7 A 2  may be generally similar to the optical imaging lens  1 , but the differences between the optical imaging lens  1  and the optical imaging lens  6  may include the refracting power of the fourth lens element L 4  and the eighth lens element L 8 , the concave or convex surface structures of the object-side surface L 3 A 1  and the image-side surfaces L 4 A 2 , L 8 A 2 , a radius of curvature, a thickness, aspherical data, and/or an system focal length of each lens element. More specifically, the fourth lens element L 4  may have negative refracting power, the eighth lens element L 8  may have positive refracting power, the optical axis region L 3 A 1 C of the object-side surface L 3 A 1  of the third lens element L 3  may be concave, the optical axis region L 4 A 2 C of the image-side surface L 4 A 2  of the fourth lens element L 4  may be concave, and the optical axis region L 8 A 2 C of the image-side surface L 8 A 2  of the eighth lens element L 8  may be convex. 
     Here, in the interest of clearly showing the drawings of the present embodiment, only the surface shapes which are different from that in the first embodiment may be labeled. Please refer to  FIG. 28  for the optical characteristics of each lens element in the optical imaging lens  6  of the present embodiment. 
     From the vertical deviation of each curve shown in  FIG. 27( a ) , the offset of the off-axis light relative to the image point may be within ±0.06 mm. Referring to  FIG. 27( b ) , the focus variation with respect to the three different wavelengths (470 nm, 555 nm and 650 nm) in the whole field may fall within ±0.06 mm. Referring to  FIG. 27( c ) , the focus variation with respect to the three different wavelengths (470 nm, 555 nm and 650 nm) in the whole field may fall within ±0.20 mm. Referring to  FIG. 27( d ) , the variation of the distortion aberration of the optical imaging lens  6  may be within ±12%. 
     In comparison with the first embodiment, the optical imaging lens  6  may be easier to be manufactured, such that yield thereof may be higher. 
     Please refer to  FIG. 46B  for the values of TTL/ImgH, (ALT+EFL)/AAG, ALT/(G56+G78), TL/(T6+G67), (T1+T6+G78)/(BFL+T7), (T1+G12+T2)/BFL, AAG/(G34+T4+G45), AAG/T6, (T4+T8)/(G12+T2), V1+V2+V4+V6+V7, (T2+T4+T6)/(G23+T3), EFL/(T5+T8), (TL+BFL)/(T4+T7), ALT/(T6+G78), AAG/(T1+T7+T8), (T3+T4+T5)/(T2+BFL), (G67+G78)/(G12+G23), (G23+G34+G45+G56)/G78, and (T1+T3+T5)/(G67+G78) of the present embodiment. 
     Reference is now made to  FIGS. 30-33 .  FIG. 30  illustrates an example cross-sectional view of an optical imaging lens  7  according to a seventh example embodiment.  FIG. 31  shows example charts of a longitudinal spherical aberration and other kinds of optical aberrations of the optical imaging lens  7  according to the seventh example embodiment.  FIG. 32  shows an example table of optical data of each lens element of the optical imaging lens  7  according to the seventh example embodiment.  FIG. 33  shows an example table of aspherical data of the optical imaging lens  7  according to the seventh example embodiment. 
     As shown in  FIG. 30 , the optical imaging lens  7  of the present embodiment, in an order from an object side A 1  to an image side A 2  along an optical axis, may comprise an aperture stop STO, a first lens element L 1 , a second lens element L 2 , a third lens element L 3 , a fourth lens element L 4 , a fifth lens element L 5 , a sixth lens element L 6 , a seventh lens element L 7 , and an eighth lens element L 8 . 
     The arrangement of the convex or concave surface structures, including the object-side surfaces L 1 A 1 , L 2 A 1 , L 3 A 1 , L 5 A 1 , L 6 A 1 , L 7 A 1 , L 8 A 1  and the image-side surfaces L 1 A 2 , L 2 A 2 , L 3 A 2 , L 4 A 2 , L 5 A 2 , L 6 A 2 , L 7 A 2 , L 8 A 2  may be generally similar to the optical imaging lens  1 , but the differences between the optical imaging lens  1  and the optical imaging lens  7  may include the concave or convex surface structure of the object-side surface L 4 A 1 , a radius of curvature, a thickness, aspherical data, and/or an system focal length of each lens element. More specifically, the optical axis region L 4 A 1 C of the object-side surface L 4 A 1  of the fourth lens element L 4  may be concave in the seventh embodiment. 
     Here, in the interest of clearly showing the drawings of the present embodiment, only the surface shapes which are different from that in the first embodiment may be labeled. Please refer to  FIG. 32  for the optical characteristics of each lens element in the optical imaging lens  7  of the present embodiment. 
     From the vertical deviation of each curve shown in  FIG. 31( a ) , the offset of the off-axis light relative to the image point may be within ±0.09 mm. Referring to  FIG. 31( b ) , the focus variation with respect to the three different wavelengths (470 nm, 555 nm and 650 nm) in the whole field may fall within ±0.09 mm. Referring to  FIG. 31( c ) , the focus variation with respect to the three different wavelengths (470 nm, 555 nm and 650 nm) in the whole field may fall within ±0.09 mm. Referring to  FIG. 31( d ) , the variation of the distortion aberration of the optical imaging lens  7  may be within ±35%. 
     In comparison with the first embodiment, the image height may be larger in the seventh embodiment as shown in  FIG. 31  and  FIG. 32 . 
     Please refer to  FIG. 46B  for the values of TTL/ImgH, (ALT+EFL)/AAG, ALT/(G56+G78), TL/(T6+G67), (T1+T6+G78)/(BFL+T7), (T1+G12+T2)/BFL, AAG/(G34+T4+G45), AAG/T6, (T4+T8)/(G12+T2), V1+V2+V4+V6+V7, (T2+T4+T6)/(G23+T3), EFL/(T5+T8), (TL+BFL)/(T4+T7), ALT/(T6+G78), AAG/(T1+T7+T8), (T3+T4+T5)/(T2+BFL), (G67+G78)/(G12+G23), (G23+G34+G45+G56)/G78, and (T1+T3+T5)/(G67+G78) of the present embodiment. 
     Reference is now made to  FIGS. 34-37 .  FIG. 34  illustrates an example cross-sectional view of an optical imaging lens  8  according to an eighth example embodiment.  FIG. 35  shows example charts of a longitudinal spherical aberration and other kinds of optical aberrations of the optical imaging lens  8  according to the eighth example embodiment.  FIG. 36  shows an example table of optical data of each lens element of the optical imaging lens  8  according to the eighth example embodiment.  FIG. 37  shows an example table of aspherical data of the optical imaging lens  8  according to the eighth example embodiment. 
     As shown in  FIG. 34 , the optical imaging lens  8  of the present embodiment, in an order from an object side A 1  to an image side A 2  along an optical axis, may comprise an aperture stop STO, a first lens element L 1 , a second lens element L 2 , a third lens element L 3 , a fourth lens element L 4 , a fifth lens element L 5 , a sixth lens element L 6 , a seventh lens element L 7 , and an eighth lens element L 8 . 
     The arrangement of the convex or concave surface structures, including the object-side surfaces L 1 A 1 , L 2 A 1 , L 4 A 1 , L 5 A 1 , L 6 A 1 , L 7 A 1 , L 8 A 1  and the image-side surfaces L 1 A 2 , L 2 A 2 , L 3 A 2 , L 5 A 2 , L 6 A 2 , L 7 A 2 , L 8 A 2  may be generally similar to the optical imaging lens  1 , but the differences between the optical imaging lens  1  and the optical imaging lens  8  may include the concave or convex surface structures of the object-side surface L 3 A 1  and the image-side surface L 4 A 2 , a radius of curvature, a thickness, aspherical data, and/or an system focal length of each lens element. More specifically, the periphery region L 3 A 1 P of the object-side surface L 3 A 1  of the third lens element L 3  may be convex and the optical axis region L 4 A 2 C of the image-side surface L 4 A 2  of the fourth lens element L 4  may be concave. 
     Here, in the interest of clearly showing the drawings of the present embodiment, only the surface shapes which are different from that in the first embodiment may be labeled. Please refer to  FIG. 36  for the optical characteristics of each lens element in the optical imaging lens  8  of the present embodiment. 
     From the vertical deviation of each curve shown in  FIG. 35( a ) , the offset of the off-axis light relative to the image point may be within ±0.05 mm. Referring to  FIG. 35( b ) , the focus variation with respect to the three different wavelengths (470 nm, 555 nm and 650 nm) in the whole field may fall within ±0.06 mm. Referring to  FIG. 35( c ) , the focus variation with respect to the three different wavelengths (470 nm, 555 nm and 650 nm) in the whole field may fall within ±0.12 mm. Referring to  FIG. 35( d ) , the variation of the distortion aberration of the optical imaging lens  8  may be within ±25%. 
     In comparison with the first embodiment, the half field of view and the image height may be larger, and the system length may be shorter in the eighth embodiment as shown in  FIG. 35  and  FIG. 36 . 
     Please refer to  FIG. 46B  for the values of TTL/ImgH, (ALT+EFL)/AAG, ALT/(G56+G78), TL/(T6+G67), (T1+T6+G78)/(BFL+T7), (T1+G12+T2)/BFL, AAG/(G34+T4+G45), AAG/T6, (T4+T8)/(G12+T2), V1+V2+V4+V6+V7, (T2+T4+T6)/(G23+T3), EFL/(T5+T8), (TL+BFL)/(T4+T7), ALT/(T6+G78), AAG/(T1+T7+T8), (T3+T4+T5)/(T2+BFL), (G67+G78)/(G12+G23), (G23+G34+G45+G56)/G78, and (T1+T3+T5)/(G67+G78) of the present embodiment. 
     Reference is now made to  FIGS. 38-41 .  FIG. 38  illustrates an example cross-sectional view of an optical imaging lens  9  according to a ninth example embodiment.  FIG. 39  shows example charts of a longitudinal spherical aberration and other kinds of optical aberrations of the optical imaging lens  9  according to the ninth example embodiment.  FIG. 40  shows an example table of optical data of each lens element of the optical imaging lens  9  according to the ninth example embodiment.  FIG. 41  shows an example table of aspherical data of the optical imaging lens  9  according to the ninth example embodiment. 
     As shown in  FIG. 38 , the optical imaging lens  9  of the present embodiment, in an order from an object side A 1  to an image side A 2  along an optical axis, may comprise an aperture stop STO, a first lens element L 1 , a second lens element L 2 , a third lens element L 3 , a fourth lens element L 4 , a fifth lens element L 5 , a sixth lens element L 6 , a seventh lens element L 7 , and an eighth lens element L 8 . 
     The arrangement of the convex or concave surface structures, including the object-side surfaces L 1 A 1 , L 2 A 1 , L 3 A 1 , L 4 A 1 , L 5 A 1 , L 6 A 1 , L 7 A 1 , L 8 A 1  and the image-side surfaces L 1 A 2 , L 2 A 2 , L 5 A 2 , L 6 A 2 , L 7 A 2 , L 8 A 2  may be generally similar to the optical imaging lens  1 , but the differences between the optical imaging lens  1  and the optical imaging lens  9  may include the refracting power of the third lens element L 3 , the concave or convex surface structures of the image-side surfaces L 3 A 2 , L 4 A 2 , a radius of curvature, a thickness, aspherical data, and/or an system focal length of each lens element. More specifically, the third lens element L 3  may have negative refracting power, the optical axis region L 3 A 2 C of the image-side surface L 3 A 2  of the third lens element L 3  may be concave, and the optical axis region L 4 A 2 C of the image-side surface L 4 A 2  of the fourth lens element L 4  may be concave in the ninth embodiment. 
     Here, in the interest of clearly showing the drawings of the present embodiment, only the surface shapes which are different from that in the first embodiment may be labeled. Please refer to  FIG. 40  for the optical characteristics of each lens element in the optical imaging lens  9  of the present embodiment. 
     From the vertical deviation of each curve shown in  FIG. 39( a ) , the offset of the off-axis light relative to the image point may be within ±0.05 mm. Referring to  FIG. 39( b ) , the focus variation with respect to the three different wavelengths (470 nm, 555 nm and 650 nm) in the whole field may fall within ±0.05 mm. Referring to  FIG. 39( c ) , the focus variation with respect to the three different wavelengths (470 nm, 555 nm and 650 nm) in the whole field may fall within ±0.05 mm. Referring to  FIG. 39( d ) , the variation of the distortion aberration of the optical imaging lens  9  may be within ±30%. 
     In comparison with the first embodiment, the image height may be larger in the ninth embodiment as shown in  FIG. 39  and  FIG. 40 . 
     Please refer to  FIG. 46B  for the values of TTL/ImgH, (ALT+EFL)/AAG, ALT/(G56+G78), TL/(T6+G67), (T1+T6+G78)/(BFL+T7), (T1+G12+T2)/BFL, AAG/(G34+T4+G45), AAG/T6, (T4+T8)/(G12+T2), V1+V2+V4+V6+V7, (T2+T4+T6)/(G23+T3), EFL/(T5+T8), (TL+BFL)/(T4+T7), ALT/(T6+G78), AAG/(T1+T7+T8), (T3+T4+T5)/(T2+BFL), (G67+G78)/(G12+G23), (G23+G34+G45+G56)/G78, and (T1+T3+T5)/(G67+G78) of the present embodiment. 
     Reference is now made to  FIGS. 42-45 .  FIG. 42  illustrates an example cross-sectional view of an optical imaging lens  10  according to a tenth example embodiment.  FIG. 43  shows example charts of a longitudinal spherical aberration and other kinds of optical aberrations of the optical imaging lens  10  according to the tenth example embodiment.  FIG. 44  shows an example table of optical data of each lens element of the optical imaging lens  10  according to the tenth example embodiment.  FIG. 45  shows an example table of aspherical data of the optical imaging lens  10  according to the tenth example embodiment. 
     As shown in  FIG. 42 , the optical imaging lens  10  of the present embodiment, in an order from an object side A 1  to an image side A 2  along an optical axis, may comprise an aperture stop STO, a first lens element L 1 , a second lens element L 2 , a third lens element L 3 , a fourth lens element L 4 , a fifth lens element L 5 , a sixth lens element L 6 , a seventh lens element L 7 , and an eighth lens element L 8 . 
     The arrangement of the convex or concave surface structures, including the object-side surfaces L 1 A 1 , L 2 A 1 , L 3 A 1 , L 4 A 1 , L 5 A 1 , L 6 A 1 , L 7 A 1 , L 8 A 1  and the image-side surfaces L 1 A 2 , L 2 A 2 , L 3 A 2 , L 5 A 2 , L 6 A 2 , L 7 A 2 , L 8 A 2  may be generally similar to the optical imaging lens  1 , but the differences between the optical imaging lens  1  and the optical imaging lens  10  may include the refracting power of the fourth lens element L 4 , the concave or convex surface structure of the image-side surface L 4 A 2 , a radius of curvature, a thickness, aspherical data, and/or an system focal length of each lens element. More specifically, the fourth lens element L 4  may have negative refracting power, and the optical axis region L 4 A 2 C of the image-side surface L 4 A 2  of the fourth lens element L 4  may be concave in the tenth embodiment. 
     Here, in the interest of clearly showing the drawings of the present embodiment, only the surface shapes which are different from that in the first embodiment may be labeled. Please refer to  FIG. 44  for the optical characteristics of each lens element in the optical imaging lens  10  of the present embodiment. 
     From the vertical deviation of each curve shown in  FIG. 43( a ) , the offset of the off-axis light relative to the image point may be within ±0.08 mm. Referring to  FIG. 43( b ) , the focus variation with respect to the three different wavelengths (470 nm, 555 nm and 650 nm) in the whole field may fall within ±0.08 mm. Referring to  FIG. 43( c ) , the focus variation with respect to the three different wavelengths (470 nm, 555 nm and 650 nm) in the whole field may fall within ±0.16 mm. Referring to  FIG. 43( d ) , the variation of the distortion aberration of the optical imaging lens  10  may be within ±6%. 
     In comparison with the first embodiment, the image height may be larger in the tenth embodiment as shown in  FIG. 43  and  FIG. 44 . 
     Please refer to  FIG. 46B  for the values of TTL/ImgH, (ALT+EFL)/AAG, ALT/(G56+G78), TL/(T6+G67), (T1+T6+G78)/(BFL+T7), (T1+G12+T2)/BFL, AAG/(G34+T4+G45), AAG/T6, (T4+T8)/(G12+T2), V1+V2+V4+V6+V7, (T2+T4+T6)/(G23+T3), EFL/(T5+T8), (TL+BFL)/(T4+T7), ALT/(T6+G78), AAG/(T1+T7+T8), (T3+T4+T5)/(T2+BFL), (G67+G78)/(G12+G23), (G23+G34+G45+G56)/G78, and (T1+T3+T5)/(G67+G78) of the present embodiment. 
       FIGS. 46A and 46B  show the values of optical parameters of all embodiments, and it may be clear that the optical imaging lens of any one of the ten embodiments may satisfy the Inequalities (1)-(19). 
     According to above disclosure, the longitudinal spherical aberration, the field curvature aberration and the variation of the distortion aberration of each embodiment may meet the use requirements of various electronic products which implement an optical imaging lens. Moreover, the off-axis light with respect to 470 nm, 555 nm and 650 nm wavelengths may be focused around an image point, and the offset of the off-axis light for each curve relative to the image point may be controlled to effectively inhibit the longitudinal spherical aberration, the field curvature aberration and/or the variation of the distortion aberration. Further, as shown by the imaging quality data provided for each embodiment, the distance between the 470 nm, 555 nm and 650 nm wavelengths may indicate that focusing ability and inhibiting ability for dispersion may be provided for different wavelengths. 
     In consideration of the non-predictability of design for the optical system, while the optical imaging lens may satisfy any one of inequalities described above, the optical imaging lens according to the disclosure herein may achieve a shortened length of the lens, reduced spherical aberration, field curvature aberration, and distortion aberration of the optical system, and an increased field of view and image height of the optical imaging system, improve an imaging quality or assembly yield, and effectively improve drawbacks of a typical optical imaging lens. 
     While various embodiments in accordance with the disclosed principles are described above, it should be understood that they are presented by way of example only, and are not limiting. Thus, the breadth and scope of exemplary embodiment(s) should not be limited by any of the above-described embodiments, but should be defined only in accordance with the claims and their equivalents issuing from this disclosure. Furthermore, the above advantages and features are provided in described embodiments, but shall not limit the application of such issued claims to processes and structures accomplishing any or all of the above advantages. 
     Additionally, the section headings herein are provided for consistency with the suggestions under 37 C.F.R. 1.77 or otherwise to provide organizational cues. These headings shall not limit or characterize the invention(s) set out in any claims that may issue from this disclosure. Specifically, a description of a technology in the “Background” is not to be construed as an admission that technology is prior art to any invention(s) in this disclosure. Furthermore, any reference in this disclosure to “invention” in the singular should not be used to argue that there is only a single point of novelty in this disclosure. Multiple inventions may be set forth according to the limitations of the multiple claims issuing from this disclosure, and such claims accordingly define the invention(s), and their equivalents, that are protected thereby. In all instances, the scope of such claims shall be considered on their own merits in light of this disclosure, but should not be constrained by the headings herein.