Patent Publication Number: US-2023134267-A1

Title: Optical imaging lens

Description:
BACKGROUND OF THE INVENTION 
     Technical Field 
     The present invention generally relates to an optical image capturing system, and more particularly to an optical imaging lens, which provides a better optical performance of high image quality and low distortion. 
     Description of Related Art 
     In recent years, with advancements in portable electronic devices having camera functionalities, the demand for an optical image capturing system is raised gradually. The image sensing device of the ordinary photographing camera is commonly selected from a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor sensor (CMOS Sensor). Besides, as advanced semiconductor manufacturing technology enables the minimization of the pixel size of the image sensing device, the development of the optical image capturing system towards the field of high pixels. Moreover, with the advancement in drones and driverless autonomous vehicles, Advanced Driver Assistance System (ADAS) plays an important role, collecting environmental information through various lenses and sensors to ensure the driving safety of the driver. Furthermore, as the image quality of the automotive lens changes with the temperature of an external application environment, the temperature requirements of the automotive lens also increase. Therefore, the requirement for high imaging quality is rapidly raised. 
     Good imaging lenses generally have the advantages of low distortion, high resolution, etc. In practice, small size and cost must be considered. Therefore, it is a big problem for designers to design a lens with good imaging quality under various constraints. 
     BRIEF SUMMARY OF THE INVENTION 
     In view of the reasons mentioned above, the primary objective of the present invention is to provide an optical imaging lens that provides a better optical performance of high image quality and low distortion. 
     The present invention provides an optical imaging lens, in order from an object side to an image side along an optical axis, including a first lens assembly, an aperture, and a second lens assembly, wherein the first lens assembly has negative refractive power and includes in order along the optical axis from the object side to the image side, a first lens, a second lens, and a third lens. The first lens has negative refractive power. The second lens has negative refractive power. An object-side surface, an image-side surface, or both of the object-side surface and the image-side surface of the second lens are aspheric surfaces. The third lens has positive refractive power. An object-side surface, an image-side surface, or both of the object-side surface and the image-side surface of the third lens are aspheric surfaces. The second lens assembly has positive refractive power and includes, in order along the optical axis from the object side to the image side, a fourth lens, a fifth lens, and a sixth lens, wherein the fourth lens has positive refractive power. The fifth lens has negative refractive power. An object-side surface, an image-side surface, or both of the object-side surface and the image-side surface of the fifth lens are aspheric surfaces. The sixth lens has positive refractive power. An object-side surface, an image-side surface, or both of the object-side surface and the image-side surface of the sixth lens are aspheric surfaces. The optical imaging lens satisfies: −0.6≤F/fg1≤−0.3; F is a focal length of the optical imaging lens and fg1 is a focal length of the first lens assembly. 
     The present invention further provides an optical imaging lens, in order from an object side to an image side along an optical axis, includes a first lens assembly, an aperture, and a second lens assembly, wherein the first lens assembly has negative refractive power and includes, in order along the optical axis from the object side to the image side, a first lens, a second lens, and a third lens. The first lens has negative refractive power. The second lens has negative refractive power. An object-side surface, an image-side surface, or both of the object-side surface and the image-side surface of the second lens are aspheric surfaces. The third lens has positive refractive power. An object-side surface, an image-side surface, or both of the object-side surface and the image-side surface of the third lens are aspheric surfaces. The second lens assembly has positive refractive power and includes, in order along the optical axis from the object side to the image side, a fourth lens, a fifth lens, and a sixth lens, wherein the fourth lens has positive refractive power; the fifth lens has negative refractive power. An object-side surface, an image-side surface, or both of the object-side surface and the image-side surface of the fifth lens are aspheric surfaces. The sixth lens has positive refractive power. An object-side surface, an image-side surface, or both of the object-side surface and the image-side surface of the sixth lens are aspheric surfaces. The optical imaging lens satisfies: 0.25≤F/fg2≤0.57; F is a focal length of the optical imaging lens and fg2 is a focal length of the second lens assembly. 
     With the aforementioned design, the optical imaging lens has a total of six lenses to form five groups of optical assemblies, and defines the first lens assembly and the second lens assembly. In addition, since the optical imaging lens satisfies −0.6≤F/fg1≤−0.3 and 0.25≤F/fg2≤0.57, which could effectively improve a chromatic aberration of the optical imaging lens and achieve the effect of high image quality. 
    
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
       The present invention will be best understood by referring to the following detailed description of some illustrative embodiments in conjunction with the accompanying drawings, in which 
         FIG.  1 A  is a schematic view of the optical imaging lens according to a first embodiment of the present invention; 
         FIG.  1 B  is a diagram showing the astigmatic field curvature of the optical imaging lens according to the first embodiment of the present invention; 
         FIG.  1 C  is a diagram showing the distortion of the optical imaging lens according to the first embodiment of the present invention; 
         FIG.  2 A  is a schematic view of the optical imaging lens according to a second embodiment of the present invention; 
         FIG.  2 B  is a diagram showing the astigmatic field curvature of the optical imaging lens according to the second embodiment of the present invention; 
         FIG.  2 C  is a diagram showing the distortion of the optical imaging lens according to the second embodiment of the present invention; 
         FIG.  3 A  is a schematic view of the optical imaging lens according to a third embodiment of the present invention; 
         FIG.  3 B  is a diagram showing the astigmatic field curvature of the optical imaging lens according to the third embodiment of the present invention; and 
         FIG.  3 C  is a diagram showing the distortion of the optical imaging lens according to the third embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     An optical imaging lens  100  according to a first embodiment of the present invention is illustrated in  FIG.  1 A , which includes, in order along an optical axis Z from an object side to an image side, a first lens assembly G 1 , an aperture ST, and a second lens assembly G 2 . In the current embodiment, the first lens assembly G 1  has negative refractive power and includes, in order along an optical axis Z from an object side to an image side, a first lens L 1 , a second lens L 2 , and a third lens L 3 ; the second lens assembly G 2  has positive refractive power and includes, in order along an optical axis Z from an object side to an image side, a fourth lens L 4 , a fifth lens L 5 , and a sixth lens L 6 . 
     The first lens L 1  is a negative meniscus with negative refractive power, wherein an object-side surface S 1  of the first lens L 1  is a convex surface toward the object side, and an image-side surface S 2  of the first lens L 1  is a concave surface toward the image side. As shown in  FIG.  1 A , both of the object-side surface S 1  and the image-side surface S 2  of the first lens L 1  are spherical surfaces; a surface of the first lens L 1  toward the object side is convex to form the object-side surface S 1 , and a part of a surface of the first lens L 1  toward the image side is recessed to form the image-side surface S 2 , and the optical axis Z passes through the object-side surface S 1  and the image-side surface S 2  of the first lens L 1 . 
     The second lens L 2  is a negative meniscus with negative refractive power, wherein an object-side surface S 3  of the second lens L 2  is a convex surface toward the object side, and an image-side surface S 4  of the second lens L 2  is a concave surface toward the image side; the object-side surface S 3 , the image-side surface S 4 , or both of the object-side surface S 3  and the image-side surface S 4  of the second lens L 2  are aspheric surfaces. As shown in  FIG.  1 A , both of the object-side surface S 3  and the image-side surface S 4  of the second lens L 2  are aspheric surfaces; a surface of the second lens L 2  toward the object side is convex to form the object-side surface S 3 , and a part of a surface of the second lens L 2  toward the image side is recessed to form the image-side surface S 4 , and the optical axis Z passes through the object-side surface S 3  and the image-side surface S 4  of the second lens L 2 . 
     The third lens L 3  is a positive meniscus with positive refractive power, wherein an object-side surface S 5  of the third lens L 3  is a convex surface toward the object side, and an image-side surface S 6  of the third lens L 3  is a concave surface toward the image side; the object-side surface S 5 , the image-side surface S 6 , or both of the object-side surface S 5  and the image-side surface S 6  of the third lens L 3  are aspheric surfaces. As shown in  FIG.  1 A , both of the object-side surface S 5  and the image-side surface S 6  of the third lens L 3  are aspheric surfaces; a surface of the third lens L 3  toward the object side is convex to form the object-side surface S 5 , and a part of a surface of the third lens L 3  toward the image side is recessed to form the image-side surface S 6 , and the optical axis Z passes through the object-side surface S 5  and the image-side surface S 6  of the third lens L 3 . 
     The fourth lens L 4  is a biconvex lens (i.e., both of an object-side surface S 7  of the fourth lens L 4  and an image-side surface S 8  of the fourth lens L 4  are convex surfaces) with positive refractive power. As shown in  FIG.  1 A , a part of a surface of the fourth lens L 4  toward the object side is convex to form the object-side surface S 7 , and a surface of the fourth lens L 4  toward the image side is convex to form the image-side surface S 8 , and the optical axis Z passes through the object-side surface S 7  and the image-side surface S 8  of the fourth lens L 4 . 
     The fifth lens L 5  is a biconcave lens (i.e., both of an object-side surface S 9  of the fifth lens L 5  and an image-side surface S 10  of the fifth lens L 5  are concave surfaces) with negative refractive power; the object-side surface S 9 , the image-side surface S 10 , or both of the object-side surface S 9  and the image-side surface S 10  of the fifth lens L 5  are aspheric surfaces. As shown in  FIG.  1 A , both of the object-side surface S 9  and the image-side surface S 10  of the fifth lens L 5  are aspheric surfaces; a part of a surface of the fifth lens L 5  toward the object side is recessed to form the object-side surface S 9 , and a part of a surface of the fifth lens L 5  toward the image side is recessed to form the image-side surface S 10 , and the optical axis Z passes through the object-side surface S 9  and the image-side surface S 10  of the fifth lens L 5 . 
     The sixth lens L 6  is a biconvex lens (i.e., both of an object-side surface S 11  of the sixth lens L 6  and an image-side surface S 12  of the sixth lens L 6  are convex surfaces) with positive refractive power; the object-side surface S11, the image-side surface S 12 , or both of the object-side surface S 11  and the image-side surface S 12  of the sixth lens L 6  are aspheric surfaces. As shown in  FIG.  1 A , both of the object-side surface S 11  and the image-side surface S 12  of the sixth lens L 6  are aspheric surfaces; a part of a surface of the sixth lens L 6  toward the object side is convex to form the object-side surface S 11 , and a part of a surface of the sixth lens L 6  toward the image side is convex to form the image-side surface S 12  with two inflection points, and the optical axis Z passes through the object-side surface S 11  and the image-side surface S 12  of the sixth lens L 6 . 
     Additionally, the optical imaging lens  100  further includes an infrared filter L 7  disposed between the sixth lens L 6  and an image plane Im of the optical imaging lens  100  and is closer to the image plane Im than the image-side surface S 12  of the sixth lens L 6 , thereby filtering out excess infrared rays in an image light passing through the optical imaging lens  100  to improve imaging quality. 
     In order to keep the optical imaging lens  100  in good optical performance and high imaging quality, the optical imaging lens  100  further satisfies: 
       −0.25≤ F/f 1≤−0.09; −0.65≤ F/f 2≤−0.3; 0.1≤ F/f 3≤0.35;   (1)
 
       −0.6≤ F/fg 1≤−0.3;   (2)
 
       0.1≤ fg 1/ f 1≤0.5; 0.5≤ fg 1/ f 2≤1.5; −0.7≤ fg 1/ f 3≤−0.2;   (3)
 
       0.3≤ F/f 4≤0.65; −0.56≤ F/f 5≤−0.25; 0.3≤ F/f 6≤0.7;   (4)
 
       0.25≤ F/fg 2≤0.57;   (5)
 
       0.5≤ fg 2/ f 4≤1.2; −1.4≤ fg 2/ f 5≤−0.5; 0.7≤ fg 2/ f 6≤1.3;   (6)
 
       0.5≤ |fg 2/ fg 1|≤2.5;   (7)
 
         nd 4≤1.65; | V 4 −V 5|≤60; 0.9≤ |f 4/ L 4 R 2|≤2;   (8)
 
       −27≤ HFoV/fg 1≤−12; 10 &lt;HFoV/fg 2≤17;   (9)
 
     wherein F is a focal length of the optical imaging lens  100 ; f1 is a focal length of the first lens L 1 ; f2 is a focal length of the second lens L 2 ; f3 is a focal length of the third lens L 3 ; f4 is a focal length of the fourth lens L 4 ; f5 is a focal length of the fifth lens L 5 ; f6 is a focal length of the sixth lens L 6 ; fg1 is a focal length of the first lens assembly G 1 ; fg2 is a focal length of the second lens assembly G 2 ; nd4 is a refractive index of the fourth lens L 4 ; V4 is an Abbe number of the fourth lens L 4 ; V5 is an Abbe number of the fifth lens L 5 ; L 4 R 2  is a radius of curvature of the image-side surface S 8  of the fourth lens L 4 . 
     Parameters of the optical imaging lens  100  of the first embodiment of the present invention are listed in following Table 1, including the focal length F of the optical imaging lens  100  (also called an effective focal length (EFL)), a F-number (Fno), a maximal field of view (HFOV), a radius of curvature (R) of each lens, a distance (D) between each surface and the next surface on the optical axis Z, a refractive index (Nd) of each lens, an Abbe number (Vd) of each lens, the focal length of each lens, wherein a unit of the focal length, the radius of curvature, and the distance is millimeter (mm). 
     
       
         
           
               
             
               
                 TABLE 1 
               
             
            
               
                   
               
               
                 F = 1.72 mm; Fno = 2.0; HFOV = 65 deg 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                   
                   
                   
                   
                   
                 Cemented 
                   
               
               
                   
                   
                   
                   
                   
                 Focal 
                 focal 
               
               
                 Surface 
                 R(mm) 
                 D(mm) 
                 Nd 
                 Vd 
                 length 
                 length 
                 Note 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 S1 
                 21.51 
                 1.50 
                 1.62 
                 60.29 
                 −12.02 
                 21.51 
                 L1 
               
               
                 S2 
                 5.40 
                 3.14 
                   
                   
                   
                 5.40 
               
               
                 S3 
                 13.63 
                 1.50 
                 1.52 
                 56.46 
                 −4.12 
                 13.63 
                 L2 
               
               
                 S4 
                 1.80 
                 2.50 
                   
                   
                   
                 1.80 
               
               
                 S5 
                 3.88 
                 4.42 
                 1.64 
                 23.53 
                 8.93 
                 3.88 
                 L3 
               
               
                 S6 
                 6.61 
                 1.44 
                   
                   
                   
                 6.61 
               
               
                 ST 
                   
                 0.10 
                   
                   
                   
                   
                 ST 
               
               
                 S7 
                 5.50 
                 2.50 
                 1.50 
                 81.55 
                 4.41 
                 5.50 
                 L4 
               
               
                 S8 
                 −3.10 
                 0.15 
                   
                   
                   
                 −3.10 
               
               
                 S9 
                 −18.91 
                 1.30 
                 1.64 
                 23.53 
                 −4.93 
                 −18.91 
                 L5 
               
               
                 S10 
                 3.92 
                 0.30 
                   
                   
                   
                 3.92 
               
               
                 S11 
                 3.04 
                 3.16 
                 1.52 
                 56.46 
                 3.94 
                 3.04 
                 L6 
               
               
                 S12 
                 −4.19 
                 2.70 
                   
                   
                   
                 −4.19 
               
               
                 S13 
                 Infinity 
                 0.30 
                 1.52 
                 64.17 
                   
                 Infinity 
                 Infrared 
               
               
                   
                   
                   
                   
                   
                   
                   
                 filter L7 
               
               
                 S14 
                 Infinity 
                 0.00 
                   
                   
                   
                 Infinity 
               
               
                 Im 
                 Infinity 
                   
                   
                   
                   
                 Infinity 
                 Im 
               
               
                   
               
            
           
         
       
     
     It can be seen from Table 1 that, in the current embodiment, the focal length F of the optical imaging lens  100  is 1.72 mm, and the Fno is 2.0, and the HFOV is 65 degrees, wherein f1=−12.02 mm; f2=−4.12 mm; f3=8.93 mm; f4=4.41 mm; L4R2=−3.10 mm; nd4=1.50; V4=81.55; f5=−4.93 mm; V5=23.53; f6=3.94 mm; fg1=−3.88 mm; fg2=4.40 mm. 
     Additionally, based on the above detailed parameters, detailed values of the aforementioned conditional formula in the first embodiment are as follows: 
         F/f 1=−0.14;  F/f 2=−0.42;  F/f 3=0.19;   (1)
 
         F/fg 1=−0.44;   (2)
 
         fg 1 /f 1=0.32;  fg 1 /f 2=0.94;  fg 1 /f 3=−0.44;   (3)
 
         F/f 4=0.39;  F/f 5=−0.35;  F/f 6=0.44;   (4)
 
         F/fg 2=0.39;   (5)
 
         fg 2/ f 4=1;  fg 2/ f 5=−0.89;  fg 2/ f 6=1.12;   (6)
 
       | fg 2/ fg 1|=1.13;   (7)
 
         nd 4=1.5; | V 4 −V 5|=58.02; | f 4/ L 4 R 2|=1.42;   (8)
 
         HFoV/fg 1=−16.74;  HFoV/fg 2=14.78.   (9)
 
     With the aforementioned design, the first lens assembly G 1  and the second lens assembly G 2  satisfy the aforementioned conditions (1) to (9) of the optical imaging lens  100 . 
     Moreover, an aspheric surface contour shape Z of each of the object-side surface S 3  of the second lens L 2 , and the image-side surface S 4  of the second lens L 2 , and the object-side surface S 9  of the fifth lens L 5 , and the image-side surface S 10  of the fifth lens L 5  of the optical imaging lens  100  according to the first embodiment could be obtained by following formula: 
     
       
         
           
             Z 
             = 
             
               
                 
                   ch 
                   2 
                 
                 
                   1 
                   + 
                   
                     
                       1 
                       - 
                       
                         
                           ( 
                           
                             1 
                             + 
                             k 
                           
                           ) 
                         
                         ⁢ 
                         
                           c 
                           2 
                         
                         ⁢ 
                         
                           h 
                           2 
                         
                       
                     
                   
                 
               
               + 
               
                 
                   A 
                   4 
                 
                 ⁢ 
                 
                   h 
                   4 
                 
               
               + 
               
                 
                   A 
                   6 
                 
                 ⁢ 
                 
                   h 
                   6 
                 
               
               + 
               
                 
                   A 
                   8 
                 
                 ⁢ 
                 
                   h 
                   8 
                 
               
               + 
               
                 
                   A 
                   10 
                 
                 ⁢ 
                 
                   h 
                   10 
                 
               
               + 
               
                 
                   A 
                   12 
                 
                 ⁢ 
                 
                   h 
                   12 
                 
               
               + 
               
                 
                   A 
                   14 
                 
                 ⁢ 
                 
                   h 
                   14 
                 
               
               + 
               
                 
                   A 
                   16 
                 
                 ⁢ 
                 
                   h 
                   16 
                 
               
             
           
         
       
     
     wherein Z is aspheric surface contour shape; c is reciprocal of radius of curvature; h is half the off-axis height of the surface; k is conic constant; A 4 , A 6 , A 8 , A 10 , A 12 , A 14 , and A 16  respectively represents different order coefficient of h. 
     The conic constant k of each of the object-side surface S 3  of the second lens L 2 , and the image-side surface S 4  of the second lens L 2 , and the object-side surface S 9  of the fifth lens L 5 , and the image-side surface S 10  of the fifth lens L 5  of the optical imaging lens  100  according to the first embodiment and the different order coefficient of A 4 , A 6 , A 8 , A 10 , A 12 , A 14 , and A 16  are listed in following Table 2 and Table 3: 
     
       
         
           
               
               
               
               
               
             
               
                 TABLE 2 
               
               
                   
               
               
                 Surface 
                 S3 
                 S4 
                 S5 
                 S6 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
            
               
                 k 
                 −9.00E+01 
                 −1.41E+00 
                 −7.06E−01 
                 1.17E+01 
               
               
                 A4 
                 5.19E−03 
                 6.56E−03 
                 −4.35E−04 
                 1.69E−03 
               
               
                 A6 
                 −4.68E−04 
                 1.56E−03 
                 7.07E−04 
                 2.09E−05 
               
               
                 A8 
                 2.30E−05 
                 −5.75E−04 
                 −1.33E−04 
                 1.29E−03 
               
               
                 A10 
                 −6.64E−07 
                 7.35E−05 
                 1.72E−05 
                 −1.12E−03 
               
               
                 A12 
                 1.07E−08 
                 −4.35E−06 
                 −1.06E−06 
                 4.24E−04 
               
               
                 A14 
                 −7.84E−11 
                 9.79E−08 
                 2.64E−08 
                 −6.23E−05 
               
               
                 A16 
                 0 
                 0 
                 0 
                 0 
               
               
                   
               
            
           
         
       
     
     
       
         
           
               
               
               
               
               
             
               
                 TABLE 3 
               
               
                   
               
               
                 Surface 
                 S9 
                 S10 
                 S11 
                 S12 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
            
               
                 k 
                 7.17E+01 
                 −1.68E+01 
                 −8.39E+00 
                 −2.70E+00 
               
               
                 A4 
                 −1.13E−02 
                 −2.36E−03 
                 3.44E−03 
                 1.35E−03 
               
               
                 A6 
                 1.88E−03 
                 −8.26E−04 
                 −1.33E−03 
                 −2.95E−04 
               
               
                 A8 
                 −7.31E−04 
                 5.08E−04 
                 3.90E−04 
                 3.71E−05 
               
               
                 A10 
                 1.72E−04 
                 −1.06E−04 
                 −4.76E−05 
                 −3.57E−06 
               
               
                 A12 
                 −3.28E−05 
                 9.16E−06 
                 2.89E−06 
                 9.49E−07 
               
               
                 A14 
                 2.68E−06 
                 −3.09E−07 
                 −7.04E−08 
                 −4.12E−08 
               
               
                 A16 
                 0 
                 0 
                 0 
                 0 
               
               
                   
               
            
           
         
       
     
     Taking optical simulation data to verify the imaging quality of the optical imaging lens  100 , wherein  FIG.  1 B  is a diagram showing the astigmatic field curves according to the first embodiment;  FIG.  1 C  is a diagram showing the distortion according to the first embodiment. The graphics shown in  FIG.  1 B  and  FIG.  1 C  are within a standard range. In this way, the optical imaging lens  100  of the first embodiment could effectively enhance image quality and lower a distortion thereof 
     An optical imaging lens  200  according to a second embodiment of the present invention is illustrated in  FIG.  2 A , which includes, in order along an optical axis Z from an object side to an image side, a first lens assembly G 1 , an aperture ST, and a second lens assembly G 2 . In the current embodiment, the first lens assembly G 1  has negative refractive power and includes, in order along an optical axis Z from an object side to an image side, a first lens L 1 , a second lens L 2 , and a third lens L 3 ; the second lens assembly G 2  has positive refractive power and includes, in order along an optical axis Z from an object side to an image side, a fourth lens L 4 , a fifth lens L 5 , and a sixth lens L 6 . 
     The first lens L 1  is a negative meniscus with negative refractive power, wherein an object-side surface S 1  of the first lens L 1  is a convex surface toward the object side, and an image-side surface S 2  of the first lens L 1  is a concave surface toward the image side. As shown in  FIG.  2 A , both of the object-side surface S 1  and the image-side surface S 2  of the first lens L 1  are spherical surfaces; a surface of the first lens L 1  toward the object side is entirely convex to form the object-side surface S 1 , and a part of a surface of the first lens L 1  toward the image side is recessed to form the image-side surface S 2 , and the optical axis Z passes through the object-side surface S 1  and the image-side surface S 2  of the first lens L 1 . 
     The second lens L 2  is a negative meniscus with negative refractive power, wherein an object-side surface S 3  of the second lens L 2  is a convex surface toward the object side, and an image-side surface S 4  of the second lens L 2  is a concave surface toward the image side; the object-side surface S 3 , the image-side surface S 4 , or both of the object-side surface S 3  and the image-side surface S 4  of the second lens L 2  are aspheric surfaces. As shown in  FIG.  2 A , both of the object-side surface S 3  and the image-side surface S 4  of the second lens L 2  are aspheric surfaces; a surface of the second lens L 2  toward the object side is entirely convex to form the object-side surface S 3 , and a part of a surface of the second lens L 2  toward the image side is recessed to form the image-side surface S 4 , and the optical axis Z passes through the object-side surface S 3  and the image-side surface S 4  of the second lens L 2 . 
     The third lens L 3  is a positive meniscus with positive refractive power, wherein an object-side surface S 5  of the third lens L 3  is a convex surface toward the object side, and an image-side surface S 6  of the third lens L 3  is a concave surface toward the image side; the object-side surface S 5 , the image-side surface S 6 , or both of the object-side surface S 5  and the image-side surface S 6  of the third lens L 3  are aspheric surfaces. As shown in  FIG.  2 A , both of the object-side surface S 5  and the image-side surface S 6  of the third lens L 3  are aspheric surfaces; a surface of the third lens L 3  toward the object side is entirely convex to form the object-side surface S 5 , and a part of a surface of the third lens L 3  toward the image side is recessed to form the image-side surface S 6 , and the optical axis Z passes through the object-side surface S 5  and the image-side surface S 6  of the third lens L 3 . 
     The fourth lens L 4  is a biconvex lens (i.e., both of an object-side surface S 7  of the fourth lens L 4  and an image-side surface S 8  of the fourth lens L 4  are convex surfaces). As shown in  FIG.  2 A , a part of a surface of the fourth lens L 4  toward the object side is convex to form the object-side surface S 7 , and a surface of the fourth lens L 4  toward the image side is entirely convex to form the image-side surface S 8 , and the optical axis Z passes through the object-side surface S 7  and the image-side surface S 8  of the fourth lens L 4 . 
     The fifth lens L 5  is a biconcave lens (i.e., both of an object-side surface S 9  of the fifth lens L 5  and an image-side surface S 10  of the fifth lens L 5  are concave surfaces) with negative refractive power; the object-side surface S 9 , the image-side surface S 10 , or both of the object-side surface S 9  and the image-side surface S 10  of the fifth lens L 5  are aspheric surfaces. As shown in  FIG.  2 A , both of the object-side surface S 9  and the image-side surface S 10  of the fifth lens L 5  are aspheric surfaces; a part of a surface of the fifth lens L 5  toward the object side is recessed to form the object-side surface S 9 , and a part of a surface of the fifth lens L 5  toward the image side is recessed to form the image-side surface S 10 , and the optical axis Z passes through the object-side surface S 9  and the image-side surface S 10  of the fifth lens L 5 . 
     The sixth lens L 6  is a biconvex lens (i.e., both of an object-side surface S 11  of the sixth lens L 6  and an image-side surface S 12  of the sixth lens L 6  are convex surfaces) with positive refractive power; the object-side surface S 11 , the image-side surface S 12 , or both of the object-side surface S 11  and the image-side surface S 12  of the sixth lens L 6  are aspheric surfaces. As shown in  FIG.  2 A , both of the object-side surface S 11  and the image-side surface S 12  of the sixth lens L 6  are aspheric surfaces; a part of a surface of the sixth lens L 6  toward the object side is convex to form the object-side surface S 11 , and a part of a surface of the sixth lens L 6  toward the image side is convex to form the image-side surface S 12  with two inflection points, and the optical axis Z passes through the object-side surface S 11  and the image-side surface S 12  of the sixth lens L 6 . 
     Additionally, the optical imaging lens  200  further includes an infrared filter L 7  disposed between the sixth lens L 6  and an image plane Im of the optical imaging lens  200  and is closer to the image plane Im than the image-side surface S 12  of the sixth lens L 6 , thereby filtering out excess infrared rays in an image light passing through the optical imaging lens  200  to improve imaging quality. 
     In order to keep the optical imaging lens  200  in good optical performance and high imaging quality, the optical imaging lens  200  further satisfies: 
       −0.25≤ F/f 1≤−0.09; −0.65&lt; F/f 2≤−0.3; 0.1≤ F/f 3≤0.35;   (1)
 
       −0.6≤ F/fg 1≤−0.3;   (2)
 
       0.1≤ fg 1/ f 1≤0.5; 0.5≤ fg 1/ f 2≤1.5; −0.7≤ fg 1/ f 3≤−0.2;   (3)
 
       0.3≤ F/f 4≤0.65; −0.56≤ F/f 5≤−0.25; 0.3≤ F/f 6≤3.7;   (4)
 
       0.25≤ F/fg 2≤0.57;   (5)
 
       0.5≤ fg 2/ f 4≤1.2; −1.4≤ fg 2/ f 5≤−0.5; 0.7≤ fg 2/ f 6≤1.3;   (6)
 
       0.5≤| fg 2/ fg 1|≤2.5;   (7)
 
         nd 4≤1.65; | V 4 −V 5|≥60; 0.9≥| f 4/ L 4 R 2|≤2;   (8)
 
       −27≤ HFoV/fg 1≤−12; 10 ≤HFoV/fg 2≤17;   (9)
 
     wherein F is a focal length of the optical imaging lens  100 ; f1 is a focal length of the first lens L1; f2 is a focal length of the second lens L 2 ; f3 is a focal length of the third lens L 3 ; f4 is a focal length of the fourth lens L 4 ; f5 is a focal length of the fifth lens L 5 ; f6 is a focal length of the sixth lens L 6 ; fg1 is a focal length of the first lens assembly G 1 ; fg2 is a focal length of the second lens assembly G 2 ; nd4 is a refractive index of the fourth lens L 4 ; V 4  is an Abbe number of the fourth lens L 4 ; V 5  is an Abbe number of the fifth lens L 5 ; L 4 R 2  is a radius of curvature of the image-side surface S 8  of the fourth lens L 4 . 
     Parameters of the optical imaging lens  200  of the second embodiment of the present invention are listed in following Table 4, including the focal length F of the optical imaging lens  200  (also called an effective focal length (EFL)), a F-number (Fno), a maximal field of view (HFOV), a radius of curvature (R) of each lens, a distance (D) between each surface and the next surface on the optical axis Z, a refractive index (Nd) of each lens, an Abbe number (Vd) of each lens, the focal length of each lens, wherein a unit of the focal length, the radius of curvature, and the distance is millimeter (mm). 
     
       
         
           
               
             
               
                 TABLE 4 
               
             
            
               
                   
               
               
                 F = 2.1 mm; Fno = 2.05; HFOV = 60 deg 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                   
                   
                   
                   
                   
                 Cemented 
                   
               
               
                   
                   
                   
                   
                   
                 Focal 
                 focal 
               
               
                 Surface 
                 R(mm) 
                 D(mm) 
                 Nd 
                 Vd 
                 length 
                 length 
                 Note 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 S1 
                 18.77 
                 1.72 
                 1.63 
                 59.18 
                 −12.70 
                 18.77 
                 L1 
               
               
                 S2 
                 5.40 
                 2.76 
                   
                   
                   
                 5.40 
               
               
                 S3 
                 8.98 
                 1.50 
                 1.53 
                 56.28 
                 −4.61 
                 8.98 
                 L2 
               
               
                 S4 
                 1.80 
                 2.24 
                   
                   
                   
                 1.80 
               
               
                 S5 
                 4.10 
                 4.92 
                 1.64 
                 23.53 
                 9.62 
                 4.10 
                 L3 
               
               
                 S6 
                 6.41 
                 1.01 
                   
                   
                   
                 6.41 
               
               
                 ST 
                   
                 −0.05 
                   
                   
                   
                   
                 ST 
               
               
                 S7 
                 5.71 
                 2.77 
                 1.59 
                 61.85 
                 3.88 
                 5.71 
                 L4 
               
               
                 S8 
                 −3.17 
                 0.15 
                   
                   
                   
                 −3.17 
               
               
                 S9 
                 −19.92 
                 1.30 
                 1.64 
                 23.53 
                 −4.73 
                 −19.92 
                 L5 
               
               
                 S10 
                 3.69 
                 0.37 
                   
                   
                   
                 3.69 
               
               
                 S11 
                 3.42 
                 3.39 
                 1.53 
                 56.28 
                 4.33 
                 3.42 
                 L6 
               
               
                 S12 
                 −4.51 
                 2.60 
                   
                   
                   
                 −4.51 
               
               
                 S13 
                 Infinity 
                 0.30 
                 1.52 
                 64.17 
                   
                 Infinity 
                 Infrared 
               
               
                   
                   
                   
                   
                   
                   
                   
                 filter L7 
               
               
                 S14 
                 Infinity 
                 0.00 
                   
                   
                   
                 Infinity 
               
               
                 Im 
                 Infinity 
                   
                   
                   
                   
                 Infinity 
                 Im 
               
               
                   
               
            
           
         
       
     
     It can be seen from Table 4 that, in the second embodiment, the focal length (F) of the optical imaging lens  200  is 2.1 mm, and the Fno is 2.05, and the HFOV is 60 degrees, wherein f1=−12.70 mm; f2=−4.61 mm; f3=9.62 mm; f4=3.88 mm; L4R2=−3.17 mm; nd4=1.59; V4=61.85; f5=−4.73 mm; V5=23.53; f6=4.33 mm; fg1=−3.87 mm; fg2=4.51 mm. 
     Additionally, based on the above detailed parameters, detailed values of the aforementioned conditional formula in the second embodiment are as follows: 
         F/f 1=−0.17;  F/f 2=−0.46;  F/f 3=0.22;   (1)
 
         F/fg 1=−0.54;   (2)
 
         fg 1 /f 1=0.3;  fg 1 /f 2=0.84;  fg 1 /f 3=−0.4;   (3)
 
         F/f 4=0.54;  F/f 5=−0.44;  F/f 6=0.48;   (4)
 
         F/fg 2=0.47;   (5)
 
         fg 2/ f 4=1.16;  fg 2/ f 5=−0.95;  fg 2/ f 6=1.04;   (6)
 
       | fg 2/ fg 1|=0.87;   (7)
 
         nd 4=1.59; | V 4− V 5|=38.32; | f 4/ L 4 R 2|=1.22;   (8)
 
         HFoV/fg 1=−15.51;  HFoV/fg 2=13.3.   (9)
 
     With the aforementioned design, the first lens assembly G 1  and the second lens assembly G 2  satisfy the aforementioned conditions (1) to (9) of the optical imaging lens  200 . 
     Moreover, an aspheric surface contour shape Z of each of the object-side surface S 3  of the second lens L 2 , and the image-side surface S 4  of the second lens L 2 , and the object-side surface S 5  of the third lens L 3 , and the image-side surface S 6  of the third lens L 3 , and the object-side surface S 9  of the fifth lens L 5 , and the image-side surface S 10  of the fifth lens L 5 , and the object-side surface  11  of the sixth lens L 6 , and the image-side surface S 12  of the sixth lens L 6  of the optical imaging lens  200  according to the second embodiment could be obtained by following formula: 
     
       
         
           
             Z 
             = 
             
               
                 
                   ch 
                   2 
                 
                 
                   1 
                   + 
                   
                     
                       1 
                       - 
                       
                         
                           ( 
                           
                             1 
                             + 
                             k 
                           
                           ) 
                         
                         ⁢ 
                         
                           c 
                           2 
                         
                         ⁢ 
                         
                           h 
                           2 
                         
                       
                     
                   
                 
               
               + 
               
                 
                   A 
                   4 
                 
                 ⁢ 
                 
                   h 
                   4 
                 
               
               + 
               
                 
                   A 
                   6 
                 
                 ⁢ 
                 
                   h 
                   6 
                 
               
               + 
               
                 
                   A 
                   8 
                 
                 ⁢ 
                 
                   h 
                   8 
                 
               
               + 
               
                 
                   A 
                   10 
                 
                 ⁢ 
                 
                   h 
                   10 
                 
               
               + 
               
                 
                   A 
                   12 
                 
                 ⁢ 
                 
                   h 
                   12 
                 
               
               + 
               
                 
                   A 
                   14 
                 
                 ⁢ 
                 
                   h 
                   14 
                 
               
               + 
               
                 
                   A 
                   16 
                 
                 ⁢ 
                 
                   h 
                   16 
                 
               
             
           
         
       
     
     wherein Z is aspheric surface contour shape; c is reciprocal of radius of curvature; h is half the off-axis height of the surface; k is conic constant; A 4 , A 6 , A 8 , A 10 , A 12 , A 14 , and A 16  respectively represents different order coefficient of h. 
     The conic constant k of each of the object-side surface S 3  of the second lens L 2 , and the image-side surface S 4  of the second lens L 2 , and the object-side surface S 5  of the third lens L 3 , and the image-side surface S 6  of the third lens L 3 , and the object-side surface S 9  of the fifth lens L 5 , and the image-side surface S 10  of the fifth lens L 5 , and the object-side surface S 11  of the sixth lens L 6 , and the image-side surface S 12  of the sixth lens L 6  of the optical imaging lens  200  according to the second embodiment and the different order coefficient of A 4 , A 6 , A 8 , A 10 , A 12 , A 14 , and A 16  are listed in following Table 5 and Table 6: 
     
       
         
           
               
               
               
               
               
             
               
                 TABLE 5 
               
               
                   
               
               
                 Surface 
                 S3 
                 S4 
                 S5 
                 S6 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
            
               
                 k 
                 −3.68E+01 
                 −1.38E+00 
                 −8.58E−01 
                 1.13E+01 
               
               
                 A4 
                 5.36E−03 
                 6.34E−03 
                 −4.20E−04 
                 2.61E−04 
               
               
                 A6 
                 −4.60E−04 
                 1.57E−03 
                 5.76E−04 
                 −3.31E−04 
               
               
                 A8 
                 2.29E−05 
                 −5.73E−04 
                 −1.30E−04 
                 1.27E−03 
               
               
                 A10 
                 −6.67E−07 
                 7.36E−05 
                 1.76E−05 
                 −1.12E−03 
               
               
                 A12 
                 1.07E−08 
                 −4.37E−06 
                 −1.09E−06 
                 4.24E−04 
               
               
                 A14 
                 −7.98E−11 
                 9.79E−08 
                 2.64E−08 
                 −6.23E−05 
               
               
                 A16 
                 0 
                 0 
                 0 
                 0 
               
               
                   
               
            
           
         
       
     
     
       
         
           
               
               
               
               
               
             
               
                 TABLE 6 
               
               
                   
               
               
                 Surface 
                 S9 
                 S10 
                 S11 
                 S12 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
            
               
                 k 
                 7.86E+01 
                 −1.30E+01 
                 −9.68E+00 
                 −1.02E+00 
               
               
                 A4 
                 −1.27E−02 
                 −1.30E−03 
                 2.65E−03 
                 1.23E−03 
               
               
                 A6 
                 1.77E−03 
                 −8.36E−04 
                 −1.35E−03 
                 −1.66E−04 
               
               
                 A8 
                 −6.22E−04 
                 5.07E−04 
                 3.88E−04 
                 2.94E−05 
               
               
                 A10 
                 1.56E−04 
                 −1.05E−04 
                 −4.78E−05 
                 −6.01E−06 
               
               
                 A12 
                 −3.28E−05 
                 9.16E−06 
                 2.88E−06 
                 9.49E−07 
               
               
                 A14 
                 2.68E−06 
                 −3.09E−07 
                 −7.04E−08 
                 −4.12E−08 
               
               
                 A16 
                 0 
                 0 
                 0 
                 0 
               
               
                   
               
            
           
         
       
     
     Taking optical simulation data to verify the imaging quality of the optical imaging lens  200 , wherein  FIG.  2 B  is a diagram showing the astigmatic field curves according to the second embodiment;  FIG.  2 C  is a diagram showing the distortion according to the second embodiment. The graphics shown in  FIG.  2 B  and  FIG.  2 C  are within a standard range. In this way, the optical imaging lens  200  of the second embodiment could effectively enhance image quality and lower a distortion thereof. 
     An optical imaging lens  300  according to a third embodiment of the present invention is illustrated in  FIG.  3 A , which includes, in order along an optical axis Z from an object side to an image side, a first lens assembly G 1 , an aperture ST, and a second lens assembly G 2 . In the current embodiment, the first lens assembly G 1  has negative refractive power and includes, in order along an optical axis Z from an object side to an image side, a first lens L 1 , a second lens L 2 , and a third lens L 3 ; the second lens assembly G 2  has positive refractive power and includes, in order along an optical axis Z from an object side to an image side, a fourth lens L 4 , a fifth lens L 5 , and a sixth lens L 6 . 
     The first lens L 1  is a negative meniscus with negative refractive power, wherein an object-side surface S 1  of the first lens L 1  is a convex surface toward the object side, and an image-side surface S 2  of the first lens L 1  is a concave surface toward the image side. As shown in  FIG.  3 A , both of the object-side surface Si and the image-side surface S 2  of the first lens L 1  are spherical surfaces; a surface of the first lens L 1  toward the object side is entirely convex to form the object-side surface S 1 , and a part of a surface of the first lens L 1  toward the image side is recessed to form the image-side surface S 2 , and the optical axis Z passes through the object-side surface S 1  and the image-side surface S 2  of the first lens L 1 . 
     The second lens L 2  is a negative meniscus with negative refractive power, wherein an object-side surface S 3  of the second lens L 2  is a convex surface toward the object side, and an image-side surface S 4  of the second lens L 2  is a concave surface toward the image side; the object-side surface S 3 , the image-side surface S 4 , or both of the object-side surface S 3  and the image-side surface S 4  of the second lens L 2  are aspheric surfaces. As shown in  FIG.  3 A , both of the object-side surface S 3  and the image-side surface S 4  of the second lens L 2  are aspheric surfaces; a surface of the second lens L 2  toward the object side is entirely convex to form the object-side surface S 3 , and a part of a surface of the second lens L 2  toward the image side is recessed to form the image-side surface S 4 , and the optical axis Z passes through the object-side surface S 3  and the image-side surface S 4  of the second lens L 2 . 
     The third lens L 3  is a positive meniscus with positive refractive power, wherein an object-side surface S 5  of the third lens L 3  is a convex surface toward the object side, and an image-side surface S 6  of the third lens L 3  is a concave surface toward the image side; the object-side surface S 5 , the image-side surface S 6 , or both of the object-side surface S 5  and the image-side surface S 6  of the third lens L 3  are aspheric surfaces. As shown in  FIG.  3 A , both of the object-side surface S 5  and the image-side surface S 6  of the third lens L 3  are aspheric surfaces; a surface of the third lens L 3  toward the object side is entirely convex to form the object-side surface S 5 , and a part of a surface of the third lens L 3  toward the image side is recessed to form the image-side surface S 6 , and the optical axis Z passes through the object-side surface S 5  and the image-side surface S 6  of the third lens L 3 . 
     The fourth lens L 4  is a biconvex lens (i.e., both of an object-side surface S 7  of the fourth lens L 4  and an image-side surface S 8  of the fourth lens L 4  are convex surfaces) with positive refractive power. As shown in  FIG.  3 A , a part of a surface of the fourth lens L 4  toward the object side is convex to form the object-side surface S 7 , and a surface of the fourth lens L 4  toward the image side is entirely convex to form the image-side surface S 8 , and the optical axis Z passes through the object-side surface S 7  and the image-side surface S 8  of the fourth lens L 4 . 
     The fifth lens L 5  is a biconcave lens (i.e., both of an object-side surface S 9  of the fifth lens L 5  and an image-side surface S 10  of the fifth lens L 5  are concave surfaces) with negative refractive power; the object-side surface S 9 , the image-side surface S 10 , or both of the object-side surface S 9  and the image-side surface S 10  of the fifth lens L 5  are aspheric surfaces. As shown in  FIG.  3 A , both of the object-side surface S 9  and the image-side surface S 10  of the fifth lens L 5  are aspheric surfaces; a part of a surface of the fifth lens L 5  toward the object side is recessed to form the object-side surface S 9 , and a part of a surface of the fifth lens L 5  toward the image side is recessed to form the image-side surface S 10 , and the optical axis Z passes through the object-side surface S 9  and the image-side surface S 10  of the fifth lens L 5 . 
     The sixth lens L 6  is a biconvex lens (i.e., both of an object-side surface S 11  of the sixth lens L 6  and an image-side surface S 12  of the sixth lens L 6  are convex surfaces) with positive refractive power; the object-side surface S 11 , the image-side surface S 12 , or both of the object-side surface S 11  and the image-side surface S 12  of the sixth lens L 6  are aspheric surfaces. As shown in  FIG.  3 A , both of the object-side surface S 11  and the image-side surface S 12  of the sixth lens L 6  are aspheric surfaces; a part of a surface of the sixth lens L 6  toward the object side is convex to form the object-side surface S 11 , and a part of a surface of the sixth lens L 6  toward the image side is convex to form the image-side surface S 12  with two inflection points, and the optical axis Z passes through the object-side surface S 11  and the image-side surface S 12  of the sixth lens L 6 . 
     Additionally, the optical imaging lens  300  further includes an infrared filter L 7  disposed between the sixth lens L 6  and an image plane Im of the optical imaging lens  300  and is closer to the image plane Im than the image-side surface S 12  of the sixth lens L 6 , thereby filtering out excess infrared rays in an image light passing through the optical imaging lens  300  to improve imaging quality. 
     In order to keep the optical imaging lens  300  in good optical performance and high imaging quality, the optical imaging lens  300  further satisfies: 
       −0.25≤ F/f 1≤−0.09; −0.65≤ F/f 2≤−0.3; 0.1≤ F/f 3≤0.35;   (1)
 
       −0.6≤ F/fg 1≤−0.3;   (2)
 
       0.1≤ fg 1 /f 1≤0.5; 0.5≤ fg 1 /f 2≤1.5; −0.7≤ fg 1 /f 3≤−0.2;   (3)
 
       0.3≤ F/f 4&lt;0.65; −0.56≤ F/f 5≤−0.25; 0.3≤ F/f 6≤0.7;   (4)
 
       0.25≤ F/fg 2≤0.57;   (5)
 
       0.5≤ fg 2/ f 4≤1.2; −1.4≤ fg 2/ f 5≤−0.5; 0.7≤ fg 2/ f 6≤1.3;   (6)
 
       0.5 ≤fg 2/ fg 1|≤2.5;   (7)
 
         nd 4≤1.65; | V 4− V 5|≤60; 0.9≤| f 4/ L 4 R 2|≤2;   (8)
 
       −27≤ HFoV/fg 1≤−12; 10≤ HFoV/fg 2≤17;   (9)
 
     wherein F is a focal length of the optical imaging lens  300 ; f1 is a focal length of the first lens L 1 ; f2 is a focal length of the second lens L 2 ; f3 is a focal length of the third lens L 3 ; f4 is a focal length of the fourth lens L 4 ; f5 is a focal length of the fifth lens L 5 ; f6 is a focal length of the sixth lens L 6 ; l fg1 is a focal length of the first lens assembly G 1 ; fg2 is a focal length of the second lens assembly G 2 ; nd4 is a refractive index of the fourth lens L 4 ; V 4  is an Abbe number of the fourth lens L 4 ; V 5  is an Abbe number of the fifth lens L 5 ; L 4 R 2  is a radius of curvature of the image-side surface S 8  of the fourth lens L 4 . 
     Parameters of the optical imaging lens  300  of the third embodiment of the present invention are listed in following Table 7, including the focal length F of the optical imaging lens  300  (also called an effective focal length (EFL)), a F-number (Fno), a maximal field of view (HFOV), a radius of curvature (R) of each lens, a distance (D) between each surface and the next surface on the optical axis Z, a refractive index (Nd) of each lens, an Abbe number (Vd) of each lens, the focal length of each lens, wherein a unit of the focal length, the radius of curvature, and the distance is millimeter (mm). 
     
       
         
           
               
             
               
                 TABLE 7 
               
             
            
               
                   
               
               
                 F = 1.59 mm; Fno = 1.9; HFOV = 65 deg 
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                   
                   
                   
                   
                   
                   
                 Cemented 
                   
               
               
                   
                   
                   
                   
                   
                 Focal 
                 focal 
               
               
                 Surface 
                 R(mm) 
                 D(mm) 
                 Nd 
                 Vd 
                 length 
                 length 
                 Note 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
               
            
               
                 S1 
                 21.50 
                 2.35 
                 1.62 
                 60.32 
                 −12.27 
                 21.50 
                 L1 
               
               
                 S2 
                 5.40 
                 3.26 
                   
                   
                   
                 5.40 
               
               
                 S3 
                 14.00 
                 1.50 
                 1.53 
                 56.46 
                 −4.09 
                 14.00 
                 L2 
               
               
                 S4 
                 1.80 
                 2.76 
                   
                   
                   
                 1.80 
               
               
                 S5 
                 4.34 
                 5.00 
                 1.64 
                 23.52 
                 9.95 
                 4.34 
                 L3 
               
               
                 S6 
                 7.36 
                 1.25 
                   
                   
                   
                 7.36 
               
               
                 ST 
                 Infinity 
                 0.06 
                   
                   
                   
                 Infinity 
                 ST 
               
               
                 S7 
                 5.50 
                 2.45 
                 1.57 
                 63.04 
                 3.85 
                 5.50 
                 L4 
               
               
                 S8 
                 −3.10 
                 0.15 
                   
                   
                   
                 −3.10 
               
               
                 S9 
                 −16.76 
                 1.30 
                 1.64 
                 23.52 
                 −4.21 
                 −16.76 
                 L5 
               
               
                 S10 
                 3.33 
                 0.30 
                   
                   
                   
                 3.33 
               
               
                 S11 
                 2.92 
                 3.01 
                 1.53 
                 56.46 
                 3.76 
                 2.92 
                 L6 
               
               
                 S12 
                 −3.97 
                 0.30 
                   
                   
                   
                 −3.97 
               
               
                 S13 
                 Infinity 
                 0.30 
                 1.52 
                 64.17 
                   
                 Infinity 
                 Infrared 
               
               
                   
                   
                   
                   
                   
                   
                   
                 filter L7 
               
               
                 S14 
                 Infinity 
                 2.02 
                   
                   
                   
                 Infinity 
               
               
                 Im 
                 Infinity 
                   
                   
                   
                   
                 Infinity 
                 Im 
               
               
                   
               
            
           
         
       
     
     It can be seen from Table 7 that, in the current embodiment, the focal length F of the optical imaging lens  300  is 1.59 mm, and the Fno is 1.9, and the HFOV is 65 degrees, wherein f1=−12.27 mm; f2=−4.09 mm; f3=9.95 mm; f4=3.85 mm; L4R2=−3.10 mm; nd4=1.57; V4=63.04; f5=−4.21 mm; V5=23.52; f6=3.76 mm; fg1=−3.67 mm; fg2=4.23 mm. 
     Additionally, based on the above detailed parameters, detailed values of the aforementioned conditional formula in the third embodiment are as follows: 
         F/f 1=−0.13; F/f2=−0.39; F/f3=0.16;   (1)
 
         F/fg 1=−0.43;   (2)
 
         fg 1 /f 1=0.3;  fg 1 /f 2=0.9;  fg 1 /f 3=−0.37;   (3)
 
         F/f 4=0.41;  F/f 5=−0.38;  F/f 6=0.42;   (4)
 
         F/fg 2=0.38;   (5)
 
         fg 2/ f 4=1.1;  fg 2/ f 5=−1;  fg 2/ f 6=1.13;   (6)
 
       | fg 2/ fg 1|=1.15;   (7)
 
         nd 4=1.57; | V 4 −V 5|=39.52; | f 4/ L 4 R 2|=1.24;   (8)
 
         HFoV/fg 1=−17.72;  HFoV/fg 2=15.36.   (9)
 
     With the aforementioned design, the first lens assembly G 1  and the second lens assembly G 2  satisfy the aforementioned conditions (1) to (9) of the optical imaging lens  300 . 
     Moreover, an aspheric surface contour shape Z of each of the object-side surface S 3  of the second lens L 2 , and the image-side surface S 4  of the second lens L 2 , and the object-side surface S 5  of the third lens L 3 , and the image-side surface S 6  of the third lens L 3 , and the object-side surface S 9  of the fifth lens L 5 , and the image-side surface S 10  of the fifth lens L 5 , and the object-side surface S 11  of the sixth lens L 6 , and the image-side surface S 12  of the sixth lens L 6  of the optical imaging lens  300  according to the third embodiment could be obtained by following formula: 
     
       
         
           
             Z 
             = 
             
               
                 
                   ch 
                   2 
                 
                 
                   1 
                   + 
                   
                     
                       1 
                       - 
                       
                         
                           ( 
                           
                             1 
                             + 
                             k 
                           
                           ) 
                         
                         ⁢ 
                         
                           c 
                           2 
                         
                         ⁢ 
                         
                           h 
                           2 
                         
                       
                     
                   
                 
               
               + 
               
                 
                   A 
                   4 
                 
                 ⁢ 
                 
                   h 
                   4 
                 
               
               + 
               
                 
                   A 
                   6 
                 
                 ⁢ 
                 
                   h 
                   6 
                 
               
               + 
               
                 
                   A 
                   8 
                 
                 ⁢ 
                 
                   h 
                   8 
                 
               
               + 
               
                 
                   A 
                   10 
                 
                 ⁢ 
                 
                   h 
                   10 
                 
               
               + 
               
                 
                   A 
                   12 
                 
                 ⁢ 
                 
                   h 
                   12 
                 
               
               + 
               
                 
                   A 
                   14 
                 
                 ⁢ 
                 
                   h 
                   14 
                 
               
               + 
               
                 
                   A 
                   16 
                 
                 ⁢ 
                 
                   h 
                   16 
                 
               
             
           
         
       
     
     wherein Z is aspheric surface contour shape; c is reciprocal of radius of curvature; h is half the off-axis height of the surface; k is conic constant; A 4 , A 6 , A 8 , A 10 , A 12 , A 14 , and A 16  respectively represents different order coefficient of h. 
     The conic constant k of each of the object-side surface S 3  of the second lens L 2 , and the image-side surface S 4  of the second lens L 2 , and the object-side surface S 5  of the third lens L 3 , and the image-side surface S 6  of the third lens L 3 , and the object-side surface S 9  of the fifth lens L 5 , and the image-side surface S 10  of the fifth lens L 5 , and the object-side surface S 11  of the sixth lens L 6 , and the image-side surface S 12  of the sixth lens L 6  of the optical imaging lens  300  according to the third embodiment and the different order coefficient of A 4 , A 6 , A 8 , A 10 , A 12 , A 14 , and A 16  are listed in following Table 8 and Table 9: 
     
       
         
           
               
               
               
               
               
             
               
                 TABLE 8 
               
               
                   
               
               
                 Surface 
                 S3 
                 S4 
                 S5 
                 S6 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
            
               
                 k 
                 −9.00E+01 
                 −1.33E+00 
                 −7.59E−01 
                 1.55E+01 
               
               
                 A4 
                 5.11E−03 
                 6.11E−03 
                 −3.27E−04 
                 1.90E−03 
               
               
                 A6 
                 −4.72E−04 
                 1.52E−03 
                 6.46E−04 
                 −2.95E−04 
               
               
                 A8 
                 2.30E−05 
                 −5.77E−04 
                 −1.31E−04 
                 1.51E−03 
               
               
                 A10 
                 −6.62E−07 
                 7.35E−05 
                 1.71E−05 
                 −1.16E−03 
               
               
                 A12 
                 1.07E−08 
                 −4.34E−06 
                 −1.08E−06 
                 4.24E−04 
               
               
                 A14 
                 −7.74E−11 
                 9.79E−08 
                 2.64E−08 
                 −6.23E−05 
               
               
                 A16 
                 0 
                 0 
                 0 
                 0 
               
               
                   
               
            
           
         
       
     
     
       
         
           
               
               
               
               
               
             
               
                 TABBLE 9 
               
               
                   
               
               
                 Surface 
                 S9 
                 S10 
                 S11 
                 S12 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
               
            
               
                 k 
                 5.74E+01 
                 −1.10E+01 
                 −7.22E+00 
                 −2.59E+00 
               
               
                 A4 
                 −1.36E−02 
                 −1.24E−03 
                 3.74E−03 
                 1.65E−03 
               
               
                 A6 
                 1.67E−03 
                 −1.04E−03 
                 −1.28E−03 
                 −3.17E−04 
               
               
                 A8 
                 −7.32E−04 
                 4.88E−04 
                 3.88E−04 
                 3.82E−05 
               
               
                 A10 
                 1.65E−04 
                 −1.04E−04 
                 −4.75E−05 
                 −3.27E−07 
               
               
                 A12 
                 −3.28E−05 
                 9.16E−06 
                 2.89E−06 
                 9.49E−07 
               
               
                 A14 
                 2.68E−06 
                 −3.09E−07 
                 −7.04E−08 
                 −4.12E−08 
               
               
                 A16 
                 0 
                 0 
                 0 
                 0 
               
               
                   
               
            
           
         
       
     
     Taking optical simulation data to verify the imaging quality of the optical imaging lens  300 , wherein  FIG.  3 B  is a diagram showing the astigmatic field curves according to the third embodiment;  FIG.  3 C  is a diagram showing the distortion according to the third embodiment. The graphics shown in  FIG.  3 B  and  FIG.  3 C  are within a standard range. In this way, the optical imaging lens  300  of the third embodiment could effectively enhance image quality and lower a distortion thereof. 
     It must be pointed out that the embodiments described above are only some preferred embodiments of the present invention. It is noted that, the parameters listed in Tables are not a limitation of the present invention. All equivalent structures which employ the concepts disclosed in this specification and the appended claims should fall within the scope of the present invention.