Abstract:
An optical lens system having a small F number, a wide angle of view, a short total length and a low manufacturing cost, includes, in order from an object side to an image side: a stop; a first lens element with a positive refractive power; a meniscus second lens element with a negative refractive power; a third lens element with a positive refractive power; a fourth lens element with a positive refractive power; a fifth lens element with a negative refractive power, the optical lens system has a focal length of f, the first lens element has a focal length f1, the third lens element has a focal length f3, the fourth lens element has a focal length f4, the fifth lens element has a focal length f5, and they satisfy the conditions: 0.4&lt;f4/f&lt;1.0; −0.8&lt;f5/f&lt;−0.4; and f1/f&lt;1.2&lt;f3/f.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to an optical lens system, and more particularly to a five-piece optical lens system applicable to electronic products. 
     2. Description of the Prior Art 
     With the consumer electronic industry continuously growing, the current market demand for small imaging lens system is also increasing. Especially for the imaging lens application in mobile phone, tablet computer and notebook, optical lens system has almost become mainstream in the market. Optical lens has been developed into multiple-piece lens system from the early two-piece lens system, in order to enhance resolution and image quality. Moreover, as electronic products are becoming thinner, lighter and easier to carry, the imaging lens system also needs to be further reduced in size in order to fit in the increasingly miniaturized carrier, meanwhile, it would be better to have a smaller F number, so that the imaging lens system is still able to take clear pictures even when the light is dim. For example, the optical lens systems disclosed in U.S. Pat. No. 8,310,768, 8,395,851 or 8,456,757 are all provided with multiple pieces of lens elements in order to improve resolution, however, their lengths are too long and F numbers are big. For another example, the optical lens systems disclosed in U.S. Pat. Nos. 8,284,291, 8,390,941 and 8,488,259 all have a smaller F number, but is provided with more than two lens elements which are made of high refractive material, and the use of high refractive material will increase the manufacturing cost. Yet, for another example, the optical lens system as disclosed in U.S. Pat. No. 8,456,758, only uses a single high refractive material piece and provides a smaller F number. However, the chief ray angle at the edge of the image is too large, which adversely affects the brightness and color at the peripheral of the image, namely, resulting in a poor image edge quality. 
     The present invention has been made in order to solve the above-mentioned problems. 
     SUMMARY OF THE INVENTION 
     The primary objective of the present invention is to provide an optical lens system applicable to electronic products which require the use of micro camera, such as mobile phone, notebook, and tablet computer, etc. The optical lens system of the present invention is compact and has a wide angle of view, a small F number with high image quality and low sensitivity to assembly tolerance, and a low material cost. 
     To achieve the above objective, an optical lens system in accordance with the present invention comprises, in order from an object side to an image side: 
     a stop; 
     a first lens element with a positive refractive power having an aspheric convex object-side surface and an aspheric convex image-side surface; 
     a second lens element with a negative refractive power having a meniscus shape, and a concave image-side surface, at least one of an object-side surface or the image-side surface of the second lens element being aspheric; 
     a third lens element with a positive refractive power having a convex object-side surface, and the image-side surface being convex or flat near the optical axis, both of the object-side surface and the image-side surface thereof being aspheric; 
     a fourth lens element with a positive refractive power having concave object-side surface and a convex image-side surface, at least one of the object-side surface or the image-side surface of the fourth lens element being aspheric; 
     a fifth lens element with a negative refractive power having an aspheric object-side surface and an aspheric image-side surface, the image-side surface being concave near the optical axis, and at least one inflection point being formed on the image-side surface of the fifth lens element; 
     a focal length of the optical lens system is f, a focal length of the first lens element is f1, a focal length of the third lens element is f3, a focal length of the fourth lens element is f4, a focal length of the fifth lens element is f5, and they satisfy the condition s:
 
0.4 &lt;f 4 /f&lt; 1.0;
 
−0.8 &lt;f 5 /f&lt;− 0.4;
 
 f 1 /f&lt; 1.2 &lt;f 3 /f.  
 
     When the condition 0.4&lt;f4/f&lt;1.0 is satisfied, the distribution of the refractive power of the forth lens can be controlled, so that the total length of the optical lens system would be reduced to facilitate miniaturization of optical lens system. Besides, the sensitivity of the optical lens system assembly tolerance can also be reduced. 
     When the condition −0.8&lt;f5/f&lt;−0.4 is satisfied, the total length of the optical lens system can be further reduced, and the higher order aberrations caused by other lens elements of the optical lens system can be balanced, moreover, the back focal length can also be lengthened for placing other components, such as Infrared filter plate and sensor protection glass. 
     When the condition f1/f&lt;1.2&lt;f3/f is satisfied, the refractive power of the optical lens system is mainly provided by the first lens element, thus the view angle of the optical lens system can be increased. Furthermore, the refractive power of the first and second lens elements can be appropriately distributed, and high order aberrations of the optical lens system can also be prevented from becoming too large, thus obtaining a relatively high image quality. 
     Preferably, a distance between the object-side surface and the image-side surface of the fifth lens element along an optical axis is D9, a distance between the object-side surface and the image-side surface of the fourth lens element along the optical axis is D7, the focal length of the optical lens system is f, and they satisfy the condition:
 
0.1&lt;( D 9 −D 7)×10 /f&lt; 1.0,
 
When the above condition is satisfied, the length of the optical lens system can be effectively reduced and a smaller distortion can be maintained.
 
     Preferably, a radius of curvature of the object-side surface of the fourth lens element is R7, a radius of curvature of the image-side surface of the fourth lens element is R8, and they satisfy the condition:
 
0.2&lt;( R 7 −R 8)/( R 7 +R 8)&lt;0.7,
 
When the above condition is satisfied, the field curvature and astigmatism of the optical lens system can have a better correction. Moreover, the lens elements can be ensured to have an easy-to-make shape, so as to reduce manufacturing difficulties, thereby reducing the manufacture cost.
 
     Preferably, a radius of curvature of the object-side surface of the fifth lens element is R9, the focal length of the optical lens system is f, and they satisfy the condition:
 
| R 9 |/f&gt; 4,
 
     When the above condition is satisfied, the field curvature and spherical aberration of the optical lens system can be effectively corrected. 
     Preferably, a focal length of the second lens element is f2, the focal length of the optical lens system is f, and they satisfy the condition:
 
−1.4 &lt;f 2 /f&lt;− 0.85,
 
     When the above condition is satisfied, the refractive power of the second lens element is proper, so that even the optical lens system has small F number, the assembly sensitivity of the second lens element won&#39;t increase. Besides, the aberrations generated by the first positive lens element can also be appropriately corrected. 
     Preferably, a refraction index of the second lens element is Nd2, and an Abbe number of the second lens element is Vd2, and they satisfy the condition:
 
 Nd 2&gt;1.57 and  Vd 2&lt;28,
 
     When the above condition is satisfied, the chromatic aberration of the optical lens system can be corrected. 
     Preferably, a refraction index of the third lens element is Nd3, and an Abbe number of the third lens element is Vd3, and they satisfy the condition:
 
 Nd 3&lt;1.6 and  Vd 3&gt;30,
 
     When the above condition is satisfied, the third lens element can be made of a plastic material with low dispersion and refractive power, so that the cost of the optical lens system can be reduced, while a good image quality can still be maintained. 
     Preferably, a distance from the object-side surface of the first lens element to the image plane along the optical axis is TL, a half of the maximum image height of the present optical lens system is ImgH, and they satisfy the condition:
 
 TL/ImgH&lt; 1.7,
 
     When the above condition is satisfied, the optical lens system can maintain a compact form, so that it can be installed in compact electronic product. 
     Preferably, a maximum angle of field of view of the optical lens system is FOV, and it satisfies the condition:
 
 FOV&gt; 73 degrees,
 
     Therefore, the optical lens system can catch a wider range of object. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1A  shows an optical lens system in accordance with a first embodiment of the present invention; 
         FIG. 1B  shows the longitudinal spherical aberration curve, the astigmatic field curves and the distortion curve of the first embodiment of the present invention; 
         FIG. 2A  shows an optical lens system in accordance with a second embodiment of the present invention; 
         FIG. 2B  shows the longitudinal spherical aberration curve, the astigmatic field curves and the distortion curve of the second embodiment of the present invention; 
         FIG. 3A  shows an optical lens system in accordance with a third embodiment of the present invention; 
         FIG. 3B  shows the longitudinal spherical aberration curve, the astigmatic field curves and the distortion curve of the third embodiment of the present invention; 
         FIG. 4A  shows an optical lens system in accordance with a fourth embodiment of the present invention; 
         FIG. 4B  shows the longitudinal spherical aberration curve, the astigmatic field curves and the distortion curve of the fourth embodiment of the present invention; 
         FIG. 5A  shows an optical lens system in accordance with a fifth embodiment of the present invention; 
         FIG. 5B  shows the longitudinal spherical aberration curve, the astigmatic field curves and the distortion curve of the fifth embodiment of the present invention; 
         FIG. 6A  shows an optical lens system in accordance with a sixth embodiment of the present invention; 
         FIG. 6B  shows the longitudinal spherical aberration curve, the astigmatic field curves and the distortion curve of the sixth embodiment of the present invention; 
         FIG. 7A  shows an optical lens system in accordance with a seventh embodiment of the present invention; and 
         FIG. 7B  shows the longitudinal spherical aberration curve, the astigmatic field curves and the distortion curve of the seventh embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Referring to  FIG. 1A , which shows an optical lens system in accordance with a first embodiment of the present invention, and  FIG. 1B  shows the longitudinal spherical aberration curves, the astigmatic field curves, and the distortion curve of the first embodiment of the present invention. An optical lens system in accordance with the first embodiment of the present invention comprises, in order from the object side to the image side: 
     A stop  100 . 
     A first lens element  110  with a positive refractive power made of plastic has a convex object-side surface  111  and a convex image-side surface  112 , and the object-side surface  111  and the image-side surface  112  of the first lens element  110  are aspheric. 
     A second lens element  120  with a negative refractive power made of plastic has an aspheric convex object-side surface  121 , and an aspheric concave image-side surface  122 . 
     A third lens element  130  with a positive refractive power made of plastic has an aspheric convex object-side surface  131 , and an aspheric convex image-side surface  132 . 
     A fourth lens element  140  with a positive refractive power made of plastic has aspheric concave object-side surface  141 , and an aspheric convex image-side surface  142 . 
     A fifth lens element  150  with a negative refractive power made of plastic has a concave object-side surface  151  and an image-side surface  152 , and the image-side surface  152  is concave near the optical axis, both of the object-side surface  151  and the image-side surface  152  are aspheric, and at least one inflection point is formed on the image-side surface  152 . 
     An IR filter  160  made of glass is located between the image-side surface  152  of the fifth lens element  150  and an image plane  190  and has no influence on the focal length of the optical lens system. 
     The equation for the aspheric surface profiles of the first embodiment is expressed as follows: 
     
       
         
           
             
               z 
               ⁡ 
               
                 ( 
                 h 
                 ) 
               
             
             = 
             
               
                 
                   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 
                 
               
               + 
               
                   
               
               ⁢ 
               ⋯ 
             
           
         
       
     
     z represents the distance of a point on the aspheric surface at a height h from the optical axis relative to a plane perpendicular to the optical axis at the vertex of the aspheric surface; 
     c is a paraxial curvature equal to 1/R (R: a paraxial radius of curvature); 
     h represents a vertical distance from the point on the curve of the aspheric surface to the optical axis; 
     k represents the conic constant;
         A 4 , A 6 , A g , A 10 , A 12 , A 14  . . . : represent the high-order aspheric coefficients.       

     In the first embodiment of the present optical lens system, the focal length of the optical lens system is f, the f-number of the optical lens system is Fno, half of the maximum angle of field of view of the present optical lens system is HFOV, the maximum angle of field of view of the present optical lens system is FOV, and they satisfy the conditions: f=3.54 (mm); Fno=2.05, HFOV=39 degrees, and FOV=78 degrees. 
     In the first embodiment of the present optical lens system, the focal length of the optical lens system is f, a focal length of the fourth lens element  140  is f4, and they satisfy the condition: f4/f=0.62. 
     In the first embodiment of the present optical lens system, the focal length of the optical lens system is f, a focal length of the fifth lens element  150  is f5, and they satisfy the condition: f5/f=−0.53. 
     In the first embodiment of the present optical lens system, a focal length of the first lens element  110  is f1, the focal length of the optical lens system is f, and they satisfy the condition: f1/f=0.82. 
     In the first embodiment of the present optical lens system, a focal length of the third lens element  130  is f3, the focal length of the optical lens system is f, and they satisfy the condition: f3/f=1.93. 
     In the first embodiment of the present optical lens system, a distance between the object-side surface  151  and the image-side surface  152  of the fifth lens element  150  along an optical axis  191  is D9, a distance between the object-side surface  141  and the image-side surface  142  of the fourth lens element  140  along the optical axis  191  is D7, the focal length of the optical lens system is f, and they satisfy the condition: (D9−D7)×10/f=0.41. 
     In the first embodiment of the present optical lens system, a radius of curvature of the object-side surface  141  of the fourth lens element  140  is R7, a radius of curvature of the image-side surface  142  of the fourth lens element  140  is R8, and they satisfy the condition: (R7−R8)/(R7+R8)=0.45. 
     In the first embodiment of the present optical lens system, a radius of curvature of the object-side surface  151  of the fifth lens element  150  is R9, the focal length of the optical lens system is f, and they satisfy the condition: |R9|/f=11.30. 
     In the first embodiment of the present optical lens system, a focal length of the second lens element  120  is f2, the focal length of the optical lens system is f, and they satisfy the condition: f2/f=−1.09. 
     In the first embodiment of the present optical lens system, a refraction index of the second lens element  120  is Nd2, and an Abbe number of the second lens element  120  is Vd2, and they satisfy the conditions: Nd2=1.632; Vd2=23.40. 
     In the first embodiment of the present optical lens system, a refraction index of the third lens element  130  is Nd3, and an Abbe number of the third lens element  130  is Vd3, and they satisfy the conditions: Nd3=1.544; Vd3=55.90. 
     In the first embodiment of the present optical lens system, a distance from the object-side surface  111  of the first lens element  110  to the image plane  190  along the optical axis  191  is TL, and a half of the maximum image height of the present optical lens system is ImgH, and they satisfy the condition: TL/ImgH=1.58. 
     The detailed optical data of the first embodiment is shown in table 1, and the aspheric surface data is shown in table 2, wherein the units of the radius of curvature, the thickness and the focal length in table 1 are expressed in mm, and in table 2, k represents the conic constant, and A 4 , A 6 , A g , A 10 , A 12 , A 14  . . . : represent the high-order aspheric coefficients. In the tables 1 and 2, the surfaces 1 and 2 represent the object-side surface  111  and the image-side surface  112  of the first lens element  110 , respectively, the surfaces 3 and 4 represent the object-side surface  121  and the image-side surface  122  of the second lens element  120 , respectively, the surfaces 5 and 6 represent the object-side surface  131  and the image-side surface  132  of the third lens element  130 , respectively, the surfaces 7 and 8 represent the object-side surface  141  and the image-side surface  142  of the fourth lens element  140 , respectively, and the surfaces 9 and 10 represent the object-side surface  151  and the image side surface  152  of the fifth lens element  150 , respectively. 
     
       
         
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
           
               
                 TABLE 1 
               
             
             
               
                   
               
               
                 (Embodiment 1) 
               
               
                 f(focal length) = 3.54 mm, Fno = 2.05, HFOV = 39 deg. 
               
             
          
           
               
                 Sur- 
                   
                 Curvature  
                 Thick- 
                 Ma- 
                   
                   
                 Focal 
               
               
                 face # 
                   
                 Radius 
                 ness 
                 terial 
                 index 
                 Abbe 
                 length 
               
               
                   
               
             
          
           
               
                 0 
                 Object 
                 Infinity 
                 In- 
                   
                   
                   
                   
               
               
                   
                   
                   
                 finity 
                   
                   
                   
                   
               
             
          
           
               
                 1 
                 Lens 1 
                 1.95 
                 (ASP) 
                 0.50 
                 Plastic 
                 1.544 
                 55.9 
                 2.91 
               
               
                 (stop) 
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 2 
                   
                 −7.71 
                 (ASP) 
                 0.09 
                   
                   
                   
                   
               
               
                 3 
                 Lens 2 
                 5.37 
                 (ASP) 
                 0.25 
                 Plastic 
                 1.632 
                 23.4 
                 −3.85 
               
               
                 4 
                   
                 1.64 
                 (ASP) 
                 0.26 
                   
                   
                   
                   
               
               
                 5 
                 Lens 3 
                 4.42 
                 (ASP) 
                 0.50 
                 Plastic 
                 1.544 
                 55.9 
                 6.81 
               
               
                 6 
                   
                 −22.05 
                 (ASP) 
                 0.46 
                   
                   
                   
                   
               
               
                 7 
                 Lens 4 
                 −2.20 
                 (ASP) 
                 0.56 
                 Plastic 
                 1.535 
                 55.5 
                 2.19 
               
               
                 8 
                   
                 −0.83 
                 (ASP) 
                 0.03 
                   
                   
                   
                   
               
               
                 9 
                 Lens 5 
                 −40.00 
                 (ASP) 
                 0.71 
                 Plastic 
                 1.535 
                 55.5 
                 −1.88 
               
               
                 10  
                   
                 1.04 
                 (ASP) 
                 0.29 
                   
                   
                   
                   
               
             
          
           
               
                 11  
                 IR- 
                 Infinity 
                 0.21 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 12  
                 filter 
                 Infinity 
                 0.69 
                   
                   
                   
                   
               
               
                 13  
                 Image 
                 Infinity 
                 — 
               
               
                   
               
             
          
         
       
     
     
       
         
               
             
               
               
               
               
               
               
             
           
               
                 TABLE 2 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Surface # 
                 1 
                 2 
                 3 
                 4 
                 5 
               
               
                   
               
               
                 k = 
                 −3.14E+00 
                 −4.00E+01 
                 −1.19E+01 
                 −7.30E+00 
                  6.89E+00 
               
               
                 A4 = 
                  3.85E−02 
                  5.39E−02 
                 −4.18E−02 
                  2.32E−02 
                 −8.06E−02 
               
               
                 A6 = 
                  1.23E−02 
                 −3.93E−02 
                  1.10E−01 
                  6.40E−02 
                  1.78E−02 
               
               
                 A8 = 
                 −6.28E−02 
                 −1.35E−02 
                 −1.04E−01 
                 −6.00E−02 
                 −3.33E−02 
               
               
                 A10 = 
                  6.21E−02 
                 −4.49E−03 
                 −3.17E−02 
                 −1.25E−03 
                  5.14E−02 
               
               
                 A12 = 
                 −3.16E−02 
                  1.65E−03 
                  5.81E−02 
                  1.58E−02 
                  1.06E−02 
               
               
                 A14 = 
                  2.47E−03 
                  4.12E−03 
                 −3.87E−03 
                 −2.65E−04 
                 −1.33E−02 
               
               
                 A16 = 
                   
                   
                   
                   
                   
               
               
                 A18 = 
               
               
                   
               
               
                 Surface # 
                 6 
                 7 
                 8 
                 9 
                 10 
               
               
                   
               
               
                 k =  
                 −4.00E+01 
                  2.09E+00 
                 −3.27E+00 
                  4.93E+01 
                 −7.46E+00 
               
               
                 A4 
                 −3.66E−02 
                  5.01E−02 
                 −8.99E−02 
                 −5.79E−02 
                 −6.99E−02 
               
               
                 A6 = 
                 −1.16E−02 
                  4.26E−02 
                  8.46E−02 
                 −6.50E−03 
                  2.60E−02 
               
               
                 A8 = 
                 −2.28E−02 
                 −2.05E−02 
                 −1.17E−02 
                  7.20E−03 
                 −8.62E−03 
               
               
                 A10 = 
                 −1.20E−02 
                 −1.51E−03 
                 −6.23E−04 
                  3.69E−04 
                  1.51E−03 
               
               
                 A12 = 
                  2.64E−02 
                  3.37E−03 
                  2.53E−04 
                 −1.19E−03 
                 −7.64E−05 
               
               
                 A14 = 
                  1.06E−03 
                 −3.34E−03 
                 −3.44E−04  
                  5.18E−05 
                 −2.66E−05 
               
               
                 A16 = 
                   
                  3.43E−03 
                 −8.79E−05 
                  1.51E−04 
                  5.79E−06 
               
               
                 A18 = 
                   
                   
                  4.89E−05  
                 −2.83E−05 
                 −4.00E−07 
               
               
                   
               
             
          
         
       
     
     Referring to  FIG. 2A , which shows an optical lens system in accordance with a second embodiment of the present invention, and  FIG. 2B  shows the longitudinal spherical aberration curves, the astigmatic field curves, and the distortion curve of the second embodiment of the present invention. An optical lens system in accordance with the second embodiment of the present invention comprises, in order from the object side to the image side: 
     A stop  200 . 
     A first lens element  210  with a positive refractive power made of plastic has a convex object-side surface  211  and a convex image-side surface  212 , and the object-side surface  211  and the image-side surface  212  of the first lens element  210  are aspheric. 
     A second lens element  220  with a negative refractive power made of plastic has an aspheric convex object-side surface  221 , and an aspheric concave image-side surface  222 . 
     A third lens element  230  with a positive refractive power made of plastic has an aspheric convex object-side surface  231 , and an aspheric convex image-side surface  232 . 
     A fourth lens element  240  with a positive refractive power made of plastic has aspheric concave object-side surface  241 , and an aspheric convex image-side surface  242 . 
     A fifth lens element  250  has a negative refractive power made of plastic, the object-side surface  251  is convex near the optical axis and an image-side surface  252 , and the image-side surface  252  is concave near the optical axis, both of the object-side surface  251  and the image-side surface  252  are aspheric, and at least one inflection point is formed on each of the image-side surface  252  and the object-side surface  251 . 
     An IR filter  260  made of glass is located between the image-side surface  252  of the fifth lens element  250  and an image plane  290  and has no influence on the focal length of the optical lens system. 
     The equation for the aspheric surface profiles of the second embodiment is expressed as follows: 
     
       
         
           
             
               z 
               ⁡ 
               
                 ( 
                 h 
                 ) 
               
             
             = 
             
               
                 
                   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 
                 
               
               + 
               
                   
               
               ⁢ 
               ⋯ 
             
           
         
       
     
     z represents the distance of a point on the aspheric surface at a height h from the optical axis relative to a plane perpendicular to the optical axis at the vertex of the aspheric surface; 
     c is a paraxial curvature equal to 1/R (R: a paraxial radius of curvature); 
     h represents a vertical distance from the point on the curve of the aspheric surface to the optical axis; 
     k represents the conic constant;
         A 4 , A 6 , A g , A 10 , A 12 , A 14  . . . : represent the high-order aspheric coefficients.       

     In the second embodiment of the present optical lens system, the focal length of the optical lens system is f, the f-number of the optical lens system is Fno, half of the maximum angle of field of view of the present optical lens system is HFOV, the maximum angle of field of view of the present optical lens system is FOV, and they satisfy the conditions: f=3.63 (mm); Fno=2.4, HFOV=39.4 degrees, and FOV=78.8 degrees. 
     In the second embodiment of the present optical lens system, the focal length of the optical lens system is f, a focal length of the fourth lens element  240  is f4, and they satisfy the condition: f4/f=0.61. 
     In the second embodiment of the present optical lens system, the focal length of the optical lens system is f, a focal length of the fifth lens element  250  is f5, and they satisfy the condition: f5/f=−0.54. 
     In the second embodiment of the present optical lens system, a focal length of the first lens element  210  is f1, the focal length of the optical lens system is f, and they satisfy the condition: f1/f=0.85. 
     In the second embodiment of the present optical lens system, a focal length of the third lens element  230  is f3, the focal length of the optical lens system is f, and they satisfy the condition: f3/f=2.41. 
     In the second embodiment of the present optical lens system, a distance between the object-side surface  251  and the image-side surface  252  of the fifth lens element  250  along an optical axis  291  is D9, a distance between the object-side surface  241  and the image-side surface  242  of the fourth lens element  240  along the optical axis  291  is D7, the focal length of the optical lens system is f, and they satisfy the condition: (D9−D7)×10/f=0.43. 
     In the second embodiment of the present optical lens system, a radius of curvature of the object-side surface  241  of the fourth lens element  240  is R7, a radius of curvature of the image-side surface  242  of the fourth lens element  240  is R8, and they satisfy the condition: (R7−R8)/(R7+R8)=0.39. 
     In the second embodiment of the present optical lens system, a radius of curvature of the object-side surface  251  of the fifth lens element  250  is R9, the focal length of the optical lens system is f, and they satisfy the condition: |R9|/f=4.32. 
     In the second embodiment of the present optical lens system, a focal length of the second lens element  220  is f2, the focal length of the optical lens system is f, and they satisfy the condition: f2/f=−1.27. 
     In the second embodiment of the present optical lens system, a refraction index of the second lens element  220  is Nd2, and an Abbe number of the second lens element  220  is Vd2, and they satisfy the relations: Nd2=1.632; Vd2=23.40. 
     In the second embodiment of the present optical lens system, a refraction index of the third lens element  230  is Nd3, and an Abbe number of the third lens element  230  is Vd3, and they satisfy the conditions: Nd3=1.515; Vd3=57.20. 
     In the second embodiment of the present optical lens system, a distance from the object-side surface  211  of the first lens element  210  to the image plane  290  along the optical axis  291  is TL, and a half of the maximum image height of the present optical lens system is ImgH, and they satisfy the condition: TL/ImgH=1.57. 
     The detailed optical data of the second embodiment is shown in table 3, and the aspheric surface data is shown in table 4, wherein the units of the radius of curvature, the thickness and the focal length in table 3 are expressed in mm, and in table 4, k represents the conic constant, and A 4 , A 6 , A g , A 10 , A 12 , A 14  . . . : represent the high-order aspheric coefficients. In the tables 3 and 4, the surfaces 1 and 2 represent the object-side surface  211  and the image-side surface  212  of the first lens element  210 , respectively, the surfaces 3 and 4 represent the object-side surface  221  and the image-side surface  222  of the second lens element  220 , respectively, the surfaces 5 and 6 represent the object-side surface  231  and the image-side surface  232  of the third lens element  230 , respectively, the surfaces 7 and 8 represent the object-side surface  241  and the image-side surface  242  of the fourth lens element  240 , respectively, and the surfaces 9 and 10 represent the object-side surface  251  and the image-side surface  252  of the fifth lens element  250 , respectively. 
     
       
         
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
           
               
                 TABLE 3 
               
             
             
               
                   
               
               
                 (Embodiment 2) 
               
               
                 f(focal length) = 3.63 mm, Fno = 2.4, HFOV = 39.4 deg. 
               
             
          
           
               
                 Sur- 
                   
                 Curvature 
                 Thick- 
                 Ma- 
                   
                   
                 Focal 
               
               
                 face # 
                   
                 Radius 
                 ness 
                 terial 
                 index 
                 Abbe 
                 length 
               
               
                   
               
             
          
           
               
                 0 
                 Object 
                 Infinity 
                 In- 
                   
                   
                   
                   
               
             
          
           
               
                   
                   
                   
                   
                 finity 
                   
                   
                   
                   
               
               
                 1 
                 Lens 1 
                 2.15 
                 (ASP) 
                 0.46 
                 Plastic 
                 1.535 
                 55.5 
                 3.09 
               
               
                 (stop) 
                   
                   
                   
                   
                   
                   
                   
                   
               
               
                 2 
                   
                 −6.65 
                 (ASP) 
                 0.14 
                   
                   
                   
                   
               
               
                 3 
                 Lens 2 
                 6.20 
                 (ASP) 
                 0.25 
                 Plastic 
                 1.632 
                 23.4 
                 −4.61 
               
               
                 4 
                   
                 1.95 
                 (ASP) 
                 0.31 
                   
                   
                   
                   
               
               
                 5 
                 Lens 3 
                 6.24 
                 (ASP) 
                 0.49 
                 Plastic 
                 1.515 
                 57.2 
                 8.76 
               
               
                 6 
                   
                 −15.74 
                 (ASP) 
                 0.39 
                   
                   
                   
                   
               
               
                 7 
                 Lens 4 
                 −1.85 
                 (ASP) 
                 0.58 
                 Plastic 
                 1.544 
                 55.9 
                 2.22 
               
               
                 8 
                   
                 −0.81 
                 (ASP) 
                 0.03 
                   
                   
                   
                   
               
               
                 9 
                 Lens 5 
                 15.67 
                 (ASP) 
                 0.73 
                 Plastic 
                 1.535 
                 55.5 
                 −1.95 
               
               
                 10  
                   
                 0.96 
                 (ASP) 
                 0.30 
                   
                   
                   
                   
               
             
          
           
               
                 11  
                 IR- 
                 Infinity 
                 0.21 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 12  
                 filter 
                 Infinity 
                 0.80 
                   
                   
                   
                   
               
               
                 13  
                 Image 
                 Infinity 
                 — 
               
               
                   
               
             
          
         
       
     
     
       
         
               
             
               
               
               
               
               
               
             
           
               
                 TABLE 4 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Surface # 
                 1 
                 2 
                 3 
                 4 
                 5 
               
               
                   
               
               
                 k =  
                 −4.17E+00 
                  3.00E+00 
                  1.65E+01 
                 −1.09E+01 
                 −2.56E+00 
               
               
                 A4 =  
                  1.79E−02 
                 −2.16E−02 
                 −1.00E−01 
                  4.05E−02  
                 −1.03E−01 
               
               
                 A6 =  
                 −3.38E−02 
                 −3.47E−02 
                  1.48E−01 
                  4.24E−02 
                  3.29E−02 
               
               
                 A8 =  
                 −8.90E−02 
                 −1.70E−02 
                 −1.41E−01 
                 −4.64E−02 
                 −5.21E−02 
               
               
                 A10 =  
                  7.02E−02 
                 −5.21E−02 
                  3.93E−03 
                  3.04E−02 
                  3.65E−02 
               
               
                 A12 =  
                 −7.47E−02 
                  1.74E−02 
                  1.29E−01 
                  4.78E−03 
                  1.45E−02 
               
               
                 A14 =  
                 −7.79E−03 
                  1.51E−02 
                 −6.62E−02 
                 −6.23E−03 
                 −4.72E−03 
               
               
                 A16 = 
                   
                   
                   
                   
                   
               
               
                 A18 = 
               
               
                   
               
               
                 Surface # 
                 6 
                 7 
                 8 
                 9 
                 10 
               
               
                   
               
               
                 k =  
                  2.57E+01 
                  1.08E+00  
                 −2.92E+00 
                 −3.00E+01 
                 −6.53E+00 
               
               
                 A4 =  
                 −7.35E−02 
                  3.55E−02 
                 −1.17E−01 
                 −9.42E−02 
                 −7.71E−02 
               
               
                 A6 =  
                  2.38E−02  
                  7.07E−02  
                  8.95E−02 
                  2.09E−02 
                  2.94E−02 
               
               
                 A8 =  
                 −4.87E−02 
                 −1.82E−02 
                 −1.94E−02 
                 −6.27E−03 
                 −9.05E−03 
               
               
                 A10 =  
                 −1.54E−02 
                 −2.65E−02 
                 −8.53E−04 
                 −6.03E−04 
                  1.37E−03 
               
               
                 A12 =  
                  3.12E−02  
                  8.74E−03  
                  9.29E−04 
                  3.09E−04 
                 −8.75E−05 
               
               
                 A14 =  
                 −8.02E−03 
                  9.14E−03 
                 −8.93E−05 
                   
                   
               
               
                 A16 =  
                   
                 −3.20E−03 
               
               
                   
               
             
          
         
       
     
     Referring to  FIG. 3A , which shows an optical lens system in accordance with a third embodiment of the present invention, and  FIG. 3B  shows the longitudinal spherical aberration curves, the astigmatic field curves, and the distortion curve of the third embodiment of the present invention. An optical lens system in accordance with the third embodiment of the present invention comprises, in order from the object side to the image side: 
     A stop  300 . 
     A first lens element  310  with a positive refractive power made of plastic has a convex object-side surface  311  and a convex image-side surface  312 , and the object-side surface  311  and the image-side surface  312  of the first lens element  310  are aspheric. 
     A second lens element  320  with a negative refractive power made of plastic has an aspheric convex object-side surface  321 , and an aspheric concave image-side surface  322 . 
     A third lens element  330  with a positive refractive power made of plastic has an aspheric convex object-side surface  331 , and an aspheric convex image-side surface  332 . 
     A fourth lens element  340  with a positive refractive power made of plastic has aspheric concave object-side surface  341 , and an aspheric convex image-side surface  342 . 
     A fifth lens element  350  with a negative refractive power made of plastic has concave object-side surface  351  and an image-side surface  352 , and the image-side surface  352  is concave near the optical axis, both of the object-side surface  351  and the image-side surface  352  are aspheric, and at least one inflection point is formed on the image-side surface  352 . 
     An IR filter  360  made of glass is located between the image-side surface  352  of the fifth lens element  350  and an image plane  390  and has no influence on the focal length of the optical lens system. 
     The equation for the aspheric surface profiles of the third embodiment is expressed as follows: 
     
       
         
           
             
               z 
               ⁡ 
               
                 ( 
                 h 
                 ) 
               
             
             = 
             
               
                 
                   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 
                 
               
               + 
               
                   
               
               ⁢ 
               ⋯ 
             
           
         
       
     
     z represents the distance of a point on the aspheric surface at a height h from the optical axis relative to a plane perpendicular to the optical axis at the vertex of the aspheric surface; 
     c is a paraxial curvature equal to 1/R (R: a paraxial radius of curvature); 
     h represents a vertical distance from the point on the curve of the aspheric surface to the optical axis; 
     k represents the conic constant;
         A 4 , A 6 , A g , A 10 , A 12 , A 14  . . . : represent the high-order aspheric coefficients.       

     In the third embodiment of the present optical lens system, the focal length of the optical lens system is f, the f-number of the optical lens system is Fno, half of the maximum angle of field of view of the present optical lens system is HFOV, the maximum angle of field of view of the present optical lens system is FOV, and they satisfy the relations: f=3.56 (mm); Fno=2.05, HFOV=39.6 degrees, and FOV=79.2 degrees. 
     In the third embodiment of the present optical lens system, the focal length of the optical lens system is f, a focal length of the fourth lens element  340  is f4, and they satisfy the condition: f4/f=0.65. 
     In the third embodiment of the present optical lens system, the focal length of the optical lens system is f, a focal length of the fifth lens element  350  is f5, and they satisfy the condition: f5/f=−0.55. 
     In the third embodiment of the present optical lens system, a focal length of the first lens element  310  is f1, the focal length of the optical lens system is f, and they satisfy the condition: f1/f=0.82. 
     In the third embodiment of the present optical lens system, a focal length of the third lens element  330  is f3, the focal length of the optical lens system is f, and they satisfy the condition: f3/f=1.91. 
     In the third embodiment of the present optical lens system, a distance between the object-side surface  351  and the image-side surface  352  of the fifth lens element  350  along an optical axis  391  is D9, a distance between the object-side surface  341  and the image-side surface  342  of the fourth lens element  340  along the optical axis  391  is D7, the focal length of the optical lens system is f, and they satisfy the condition: (D9−D7)×10/f=0.20. 
     In the third embodiment of the present optical lens system, a radius of curvature of the object-side surface  341  of the fourth lens element  340  is R7, a radius of curvature of the image-side surface  342  of the fourth lens element  340  is R8, and they satisfy the condition: (R7−R8)/(R7+R8)=0.43. 
     In the third embodiment of the present optical lens system, a radius of curvature of the object-side surface  351  of the fifth lens element  350  is R9, the focal length of the optical lens system is f, and they satisfy the condition: |R9|/f=11.24. 
     In the third embodiment of the present optical lens system, a focal length of the second lens element  320  is f2, the focal length of the optical lens system is f, and they satisfy the condition: f2/f=−1.08. 
     In the third embodiment of the present optical lens system, a refraction index of the second lens element  320  is Nd2, and an Abbe number of the second lens element  320  is Vd2, and they satisfy the conditions: Nd2=1.632; Vd2=23.40. 
     In the third embodiment of the present optical lens system, a refraction index of the third lens element  330  is Nd3, and an Abbe number of the third lens element  330  is Vd3, and they satisfy the conditions: Nd3=1.544; Vd3=55.90. 
     In the third embodiment of the present optical lens system, a distance from the object-side surface  311  of the first lens element  310  to the image plane  390  along the optical axis  391  is TL, and a half of the maximum image height of the present optical lens system is ImgH, and they satisfy the condition: TL/ImgH=1.52. 
     The detailed optical data of the third embodiment is shown in table 5, and the aspheric surface data is shown in table 6, wherein the units of the radius of curvature, the thickness and the focal length in table 5 are expressed in mm, and in table 6, k represents the conic constant, and A 4 , A 6 , A g , A 10 , A 12 , A 14  . . . : represent the high-order aspheric coefficients. In the tables 5 and 6, the surfaces 1 and 2 represent the object-side surface  311  and the image-side surface  312  of the first lens element  310 , respectively, the surfaces 3 and 4 represent the object-side surface  321  and the image-side surface  322  of the second lens element  320 , respectively, the surfaces 5 and 6 represent the object-side surface  331  and the image-side surface  332  of the third lens element  330 , respectively, the surfaces 7 and 8 represent the object-side surface  341  and the image-side surface  342  of the fourth lens element  340 , respectively, and the surfaces 9 and 10 represent the object-side surface  351  and the image-side surface  352  of the fifth lens element  350 , respectively. 
     
       
         
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
           
               
                 TABLE 5 
               
             
             
               
                   
               
               
                 (Embodiment 3) 
               
               
                 f (focal length) = 3.56 mm, Fno = 2.05, HFOV = 39.6 deg. 
               
             
          
           
               
                   
                   
                   
                   
                   
                   
                   
                 Focal 
               
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 index 
                 Abbe 
                 length 
               
               
                   
               
             
          
           
               
                 0 
                 Object 
                 Infinity 
                 Infinity 
                   
                   
                   
                   
               
               
                 1(stop) 
                 Lens 1 
                   1.96 (ASP) 
                 0.49 
                 Plastic 
                 1.544 
                 55.9 
                 2.92 
               
               
                 2 
                   
                  −7.71 (ASP) 
                 0.11 
                   
                   
                   
                   
               
               
                 3 
                 Lens 2  
                   6.02 (ASP) 
                 0.23 
                 Plastic 
                 1.632 
                 23.4 
                 −3.84 
               
               
                 4 
                   
                   1.17 (ASP) 
                 0.27 
                   
                   
                   
                   
               
               
                 5 
                 Lens 3 
                   4.42 (ASP) 
                 0.48 
                 Plastic 
                 1.544 
                 55.9 
                 6.81 
               
               
                 6 
                   
                 −22.05 (ASP) 
                 0.50 
                   
                   
                   
                   
               
               
                 7 
                 Lens 4 
                  −2.16 (ASP) 
                 0.56 
                 Plastic 
                 1.535 
                 55.5 
                 2.32 
               
               
                 8 
                   
                  −0.86 (ASP) 
                 0.12 
                   
                   
                   
                   
               
               
                 9 
                 Lens 5 
                 −40.00 (ASP) 
                 0.63 
                 Plastic 
                 1.535 
                 55.5 
                 −1.98 
               
               
                 10 
                   
                  1.09 (ASP) 
                 0.28 
                   
                   
                   
                   
               
               
                 11 
                 IR−filter 
                 Infinity 
                 0.21 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 12 
                   
                 Infinity 
                 0.69 
                   
                   
                   
                   
               
               
                 13 
                 Image 
                 Infinity 
                 — 
               
               
                   
               
             
          
         
       
     
     
       
         
               
             
               
               
               
               
               
               
             
           
               
                 TABLE 6 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Surface # 
                 1 
                 2 
                 3 
                 4 
                 5 
               
               
                   
               
               
                 k =  
                 −3.28E+00 
                 −4.00E+01 
                  2.20E+00 
                 −7.60E+00 
                  6.89E+00 
               
               
                 A4 =  
                  3.75E−02 
                  5.39E−02  
                 −3.54E−02 
                  3.12E−02 
                 −8.06E−02 
               
               
                 A6 =  
                  1.19E−02 
                 −3.93E−02 
                  1.01E−01 
                  6.21E−02 
                  1.78E−02 
               
               
                 A8 =  
                 −6.38E−02  
                 −1.35E−02 
                 −9.84E−02 
                 −6.10E−02 
                 −3.33E−02 
               
               
                 A10 =  
                  6.32E−02 
                 −4.49E−03  
                 −3.21E−02  
                 −7.41E−04 
                  5.14E−02 
               
               
                 A12 =  
                 −3.25E−02 
                  1.65E−03 
                  5.55E−02 
                  1.57E−02 
                  1.06E−02 
               
               
                 A14 =  
                 −2.47E−03 
                  4.12E−03 
                 −2.30E−03 
                 −2.65E−04 
                 −1.33E−02 
               
               
                 A16 =  
                   
                   
                   
                   
                   
               
               
                 A18 =  
               
               
                   
               
               
                 Surface # 
                 6 
                 7 
                 8 
                 9 
                 10 
               
               
                   
               
               
                 k =  
                 −4.00E+01 
                  1.97E+00 
                 −3.17E+00  
                 −5.00E+00 
                 −7.62E+00 
               
               
                 A4 =  
                 −3.66E−02 
                  4.07E−02 
                 −8.95E−02 
                 −6.08E−02 
                 −6.85E−02 
               
               
                 A6 =  
                 −1.16E−02  
                  3.04E−02 
                  6.69E−02 
                 −8.78E−04  
                  2.43E−02 
               
               
                 A8 =  
                 −2.28E−02  
                 −1.94E−02 
                 −1.08E−02  
                  6.23E−03 
                 −7.63E−03 
               
               
                 A10 =  
                 −1.20E−02 
                  1.38E−03 
                  1.03E−03 
                  1.72E−04  
                  1.35E−03 
               
               
                 A12 =  
                  2.64E−02 
                  3.90E−03 
                  8.59E−04 
                 −1.23E−03  
                 −7.98E−05 
               
               
                 A14 =  
                  1.06E−03 
                 −3.92E−03  
                 −1.81E−04 
                  4.11E−05 
                 −2.49E−05 
               
               
                 A16 =  
                   
                  3.75E−03 
                 −1.27E−04 
                  1.49E−04 
                  5.95E−06 
               
               
                 A18 =  
                   
                   
                   
                 −2.58E−05  
                 −4.18E−07 
               
               
                   
               
             
          
         
       
     
     Referring to  FIG. 4A , which shows an optical lens system in accordance with a fourth embodiment of the present invention, and  FIG. 4B  shows the longitudinal spherical aberration curves, the astigmatic field curves, and the distortion curve of the fourth embodiment of the present invention. An optical lens system in accordance with the fourth embodiment of the present invention comprises, in order from the object side to the image side: 
     A stop  400 . 
     A first lens element  410  with a positive refractive power made of plastic has a convex object-side surface  411  and a convex image-side surface  412 , and the object-side surface  411  and the image-side surface  412  of the first lens element  410  are aspheric. 
     A second lens element  420  with a negative refractive power made of plastic has an aspheric convex object-side surface  421 , and an aspheric concave image-side surface  422 . 
     A third lens element  430  with a positive refractive power made of plastic has an aspheric convex object-side surface  431 , and an aspheric convex image-side surface  432 . 
     A fourth lens element  440  with a positive refractive power made of plastic has an aspheric concave object-side surface  441 , and an aspheric convex image-side surface  442 . 
     A fifth lens element  450  with a negative refractive power made of plastic has a concave object-side surface  451  and an image-side surface  452 , and the image-side surface  452  is concave near the optical axis, both of the object-side surface  451  and the image-side surface  452  are aspheric, and at least one inflection point is formed on the image-side surface  452 . 
     An IR filter  460  made of glass is located between the image-side surface  452  of the fifth lens element  450  and an image plane  490  and has no influence on the focal length of the optical lens system. 
     The equation for the aspheric surface profiles of the fourth embodiment is expressed as follows: 
     
       
         
           
             
               z 
               ⁡ 
               
                 ( 
                 h 
                 ) 
               
             
             = 
             
               
                 
                   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 
                 
               
               + 
               
                   
               
               ⁢ 
               ⋯ 
             
           
         
       
     
     z represents the distance of a point on the aspheric surface at a height h from the optical axis relative to a plane perpendicular to the optical axis at the vertex of the aspheric surface; 
     c is a paraxial curvature equal to 1/R (R: a paraxial radius of curvature); 
     h represents a vertical distance from the point on the curve of the aspheric surface to the optical axis; 
     k represents the conic constant;
         A 4 , A 6 , A g , A 10 , A 12 , A 14  . . . : represent the high-order aspheric coefficients.       

     In the fourth embodiment of the present optical lens system, the focal length of the optical lens system is f, the f-number of the optical lens system is Fno, half of the maximum angle of field of view of the present optical lens system is HFOV, the maximum angle of field of view of the present optical lens system is FOV, and they satisfy the conditions: f=3.70 (mm); Fno=2.05, HFOV=38.6 degrees, and FOV=77.2 degrees. 
     In the fourth embodiment of the present optical lens system, the focal length of the optical lens system is f, a focal length of the fourth lens element  440  is f4, and they satisfy the condition: f4/f=0.82. 
     In the fourth embodiment of the present optical lens system, the focal length of the optical lens system is f, a focal length of the fifth lens element  450  is f5, and they satisfy the condition: f5/f=−0.63. 
     In the fourth embodiment of the present optical lens system, a focal length of the first lens element  410  is f1, the focal length of the optical lens system is f, and they satisfy the condition: f1/f=0.77. 
     In the fourth embodiment of the present optical lens system, a focal length of the third lens element  430  is f3, the focal length of the optical lens system is f, and they satisfy the condition: f3/f=1.90. 
     In the fourth embodiment of the present optical lens system, a distance between the object-side surface  451  and the image-side surface  452  of the fifth lens element  450  along an optical axis  491  is D9, a distance between the object-side surface  441  and the image-side surface  442  of the fourth lens element  440  along the optical axis  491  is D7, the focal length of the optical lens system is f, and they satisfy the condition: (D9−D7)×10/f=0.20. 
     In the fourth embodiment of the present optical lens system, a radius of curvature of the object-side surface  441  of the fourth lens element  440  is R7, a radius of curvature of the image-side surface  442  of the fourth lens element  440  is R8, and they satisfy the condition: (R7−R8)/(R7+R8)=0.36. 
     In the fourth embodiment of the present optical lens system, a radius of curvature of the object-side surface  451  of the fifth lens element  450  is R9, the focal length of the optical lens system is f, and they satisfy the condition: |R9|/f=7.37. 
     In the fourth embodiment of the present optical lens system, a focal length of the second lens element  420  is f2, the focal length of the optical lens system is f, and they satisfy the condition: f2/f=−1.01. 
     In the fourth embodiment of the present optical lens system, a refraction index of the second lens element  420  is Nd2, and an Abbe number of the second lens element  420  is Vd2, and they satisfy the conditions: Nd2=1.632; Vd2=23.40. 
     In the fourth embodiment of the present optical lens system, a refraction index of the third lens element  430  is Nd3, and an Abbe number of the third lens element  430  is Vd3, and they satisfy the conditions: Nd3=1.544; Vd3=55.90. 
     In the fourth embodiment of the present optical lens system, a distance from the object-side surface  411  of the first lens element  410  to the image plane  490  along the optical axis  491  is TL, and a half of the maximum image height of the present optical lens system is ImgH, and they satisfy the condition: TL/ImgH=1.52. 
     The detailed optical data of the fourth embodiment is shown in table 7, and the aspheric surface data is shown in table 8, wherein the units of the radius of curvature, the thickness and the focal length in table 7 are expressed in mm, and in table 8, k represents the conic constant, and A 4 , A 6 , A g , A 10 , A 12 , A 14  . . . : represent the high-order aspheric coefficients. In the tables 7 and 8, the surfaces 1 and 2 represent the object-side surface  411  and the image-side surface  412  of the first lens element  410 , respectively, the surfaces 3 and 4 represent the object-side surface  421  and the image-side surface  422  of the second lens element  420 , respectively, the surfaces 5 and 6 represent the object-side surface  431  and the image-side surface  432  of the third lens element  430 , respectively, the surfaces 7 and 8 represent the object-side surface  441  and the image-side surface  442  of the fourth lens element  440 , respectively, and the surfaces 9 and 10 represent the object-side surface  451  and the imag-eside surface  452  of the fifth lens element  450 , respectively. 
     
       
         
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
           
               
                 TABLE 7 
               
             
             
               
                   
               
               
                 (Embodiment 4) 
               
               
                 f (focal length) = 3.70 mm, Fno = 2.05, HFOV = 38.6 deg. 
               
             
          
           
               
                   
                   
                   
                   
                   
                   
                   
                 Focal 
               
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 index 
                 Abbe 
                 length 
               
               
                   
               
             
          
           
               
                 0 
                 Object 
                 Infinity 
                 Infinity 
                   
                   
                   
                   
               
               
                 1(stop) 
                 Lens 1 
                   1.90 (ASP) 
                 0.50 
                 Plastic 
                 1.544 
                 55.9 
                 2.84 
               
               
                 2 
                   
                  −7.41 (ASP) 
                 0.10 
                   
                   
                   
                   
               
               
                 3 
                 Lens 2  
                   6.95 (ASP) 
                 0.25 
                 Plastic 
                 1.632 
                 23.4 
                 −3.74 
               
               
                 4 
                   
                   1.74 (ASP) 
                 0.29 
                   
                   
                   
                   
               
               
                 5 
                 Lens 3 
                   4.50 (ASP) 
                 0.49 
                 Plastic 
                 1.544 
                 55.9 
                 7.04 
               
               
                 6 
                   
                 −24.67 (ASP) 
                 0.49 
                   
                   
                   
                   
               
               
                 7 
                 Lens 4 
                  −2.13 (ASP) 
                 0.50 
                 Plastic 
                 1.535 
                 55.5 
                 3.02 
               
               
                 8 
                   
                  −0.99 (ASP) 
                 0.29 
                   
                   
                   
                   
               
               
                 9 
                 Lens 5 
                 −27.28 (ASP) 
                 0.57 
                 Plastic 
                 1.515 
                 57.2 
                 −2.33 
               
               
                 10 
                   
                  1.26 (ASP) 
                 0.26 
                   
                   
                   
                   
               
               
                 11 
                 IR−filter 
                 Infinity 
                 0.21 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 12 
                   
                 Infinity 
                 0.62 
                   
                   
                   
                   
               
               
                 13 
                 Image 
                 Infinity 
                 — 
               
               
                   
               
             
          
         
       
     
     
       
         
               
             
               
               
               
               
               
               
             
           
               
                 TABLE 8 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Surface # 
                 1 
                 2 
                 3 
                 4 
                 5 
               
               
                   
               
               
                 k =  
                 −3.20E+00 
                 −3.62E+01 
                  1.45E+01 
                 −7.72E+00 
                  5.44E+00 
               
               
                 A4 =  
                  4.04E−02 
                  5.58E−02  
                 −2.88E−02 
                  3.53E−02 
                 −8.01E−02 
               
               
                 A6 =  
                  1.59E−02 
                 −2.51E−02 
                  1.05E−01  
                  6.75E−02  
                  1.77E−02 
               
               
                 A8 =  
                 −6.61E−02 
                 −1.37E−02 
                 −9.19E−02 
                 −5.67E−02 
                 −3.32E−02 
               
               
                 A10 =  
                  6.56E−02 
                 −1.06E−02 
                 −3.60E−02 
                 −2.52E−03 
                  4.88E−02 
               
               
                 A12 =  
                 −2.71E−02 
                  5.12E−03  
                  4.94E−02  
                  1.17E−02  
                  1.19E−02 
               
               
                 A14 =  
                 −4.97E−03 
                  3.52E−03  
                 −4.78E−04 
                  2.22E−03  
                 −1.28E−02 
               
               
                 A16 = 
                   
                   
                   
                   
                   
               
               
                 A18 = 
               
               
                   
               
               
                 Surface # 
                 6 
                 7 
                 8 
                 9 
                 10 
               
               
                   
               
               
                 k =  
                  4.00E+01 
                  1.87E+00 
                 −3.13E+00 
                  5.00E+01 
                 −7.51E+00 
               
               
                 A4 =  
                 −3.95E−02 
                  6.37E−02 
                 −6.02E−02 
                 −7.50E−02 
                 −6.75E−02 
               
               
                 A6 =  
                 −1.39E−02 
                  1.99E−02 
                  6.03E−02 
                  2.82E−03 
                  2.17E−02 
               
               
                 A8 =  
                 −2.24E−02 
                 −2.27E−02 
                 −1.27E−02 
                  6.34E−03  
                 −6.58E−03 
               
               
                 A10 =  
                 −1.22E−02 
                  1.94E−03 
                  9.20E−04 
                  1.19E−04  
                  1.19E−03 
               
               
                 A12 =  
                  2.59E−02 
                  5.01E−03 
                  9.71E−04 
                 −1.24E−03 
                 −8.15E−05 
               
               
                 A14 =  
                  5.80E−04  
                 −3.65E−03 
                 −1.22E−04 
                  3.84E−05 
                 −2.35E−05 
               
               
                 A16 =  
                   
                  3.29E−03 
                 −1.28E−04 
                  1.49E−04  
                  6.13E−06 
               
               
                 A18 =  
                   
                   
                   
                 −2.54E−05 
                 −4.50E−07 
               
               
                   
               
             
          
         
       
     
     Referring to  FIG. 5A , which shows an optical lens system in accordance with a fifth embodiment of the present invention, and  FIG. 5B  shows the longitudinal spherical aberration curves, the astigmatic field curves, and the distortion curve of the fifth embodiment of the present invention. An optical lens system in accordance with the fifth embodiment of the present invention comprises, in order from the object side to the image side: 
     A stop  500 . 
     A first lens element  510  with a positive refractive power made of plastic has a convex object-side surface  511  and a convex image-side surface  512 , and the object-side surface  511  and the image-side surface  512  of the first lens element  510  are aspheric. 
     A second lens element  520  with a negative refractive power made of plastic has an aspheric convex object-side surface  521 , and an aspheric concave image-side surface  522 . 
     A third lens element  530  with a positive refractive power made of plastic has an aspheric convex object-side surface  531 , and an aspheric convex image-side surface  532 . 
     A fourth lens element  540  with a positive refractive power made of plastic has aspheric concave object-side surface  541 , and an aspheric convex image-side surface  542 . 
     A fifth lens element  550  with a negative refractive power made of plastic has a concave object-side surface  551  and an image-side surface  552 , and the image-side surface  552  is concave near the optical axis, both of the object-side surface  551  and the image-side surface  552  are aspheric, and at least one inflection point is formed on the image-side surface  552 . 
     An IR filter  560  made of glass is located between the image-side surface  552  of the fifth lens element  550  and an image plane  590  and has no influence on the focal length of the optical lens system. 
     The equation for the aspheric surface profiles of the fifth embodiment is expressed as follows: 
     
       
         
           
             
               z 
               ⁡ 
               
                 ( 
                 h 
                 ) 
               
             
             = 
             
               
                 
                   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 
                 
               
               + 
               
                   
               
               ⁢ 
               ⋯ 
             
           
         
       
     
     z represents the distance of a point on the aspheric surface at a height h from the optical axis relative to a plane perpendicular to the optical axis at the vertex of the aspheric surface; 
     c is a paraxial curvature equal to 1/R (R: a paraxial radius of curvature); 
     h represents a vertical distance from the point on the curve of the aspheric surface to the optical axis; 
     k represents the conic constant;
         A 4 , A 6 , A g , A 10 , A 12 , A 14  . . . : represent the high-order aspheric coefficients.       

     In the fifth embodiment of the present optical lens system, the focal length of the optical lens system is f, the f-number of the optical lens system is Fno, half of the maximum angle of field of view of the present optical lens system is HFOV, the maximum angle of field of view of the present optical lens system is FOV, and they satisfy the conditions: f=3.70 (mm); Fno=2.0, HFOV=38.4 degrees, and FOV=76.8 degrees. 
     In the fifth embodiment of the present optical lens system, the focal length of the optical lens system is f, a focal length of the fourth lens element  540  is f4, and they satisfy the condition: f4/f=0.75. 
     In the fifth embodiment of the present optical lens system, the focal length of the optical lens system is f, a focal length of the fifth lens element  550  is f5, and they satisfy the condition: f5/f=−0.61. 
     In the fifth embodiment of the present optical lens system, a focal length of the first lens element  510  is f1, the focal length of the optical lens system is f, and they satisfy the condition: f1/f=0.71. 
     In the fifth embodiment of the present optical lens system, a focal length of the third lens element  530  is f3, the focal length of the optical lens system is f, and they satisfy the condition: f3/f=3.23. 
     In the fifth embodiment of the present optical lens system, a distance between the object-side surface  551  and the image-side surface  552  of the fifth lens element  550  along an optical axis  591  is D9, a distance between the object-side surface  541  and the image-side surface  542  of the fourth lens element  540  along the optical axis  591  is D7, the focal length of the optical lens system is f, and they satisfy the condition: (D9−D7)×10/f=0.42. 
     In the fifth embodiment of the present optical lens system, a radius of curvature of the object-side surface  541  of the fourth lens element  540  is R7, a radius of curvature of the image-side surface  542  of the fourth lens element  540  is R8, and they satisfy the condition: (R7−R8)/(R7+R8)=0.38. 
     In the fifth embodiment of the present optical lens system, a radius of curvature of the object-side surface  551  of the fifth lens element  550  is R9, the focal length of the optical lens system is f, and they satisfy the condition: |R9|/f=13.51. 
     In the fifth embodiment of the present optical lens system, a focal length of the second lens element  520  is f2, the focal length of the optical lens system is f, and they satisfy the condition: f2/f=−1.09. 
     In the fifth embodiment of the present optical lens system, a refraction index of the second lens element  520  is Nd2, and an Abbe number of the second lens element  520  is Vd2, and they satisfy the conditions: Nd2=1.632; Vd2=23.40. 
     In the fifth embodiment of the present optical lens system, a refraction index of the third lens element  530  is Nd3, and an Abbe number of the third lens element  530  is Vd3, and they satisfy the conditions: Nd3=1.544; Vd3=55.90. 
     In the fifth embodiment of the present optical lens system, a distance from the object-side surface  511  of the first lens element  510  to the image plane  590  along the optical axis  591  is TL, and a half of the maximum image height of the present optical lens system is ImgH, and they satisfy the condition: TL/ImgH=1.52. 
     The detailed optical data of the fifth embodiment is shown in table 9, and the aspheric surface data is shown in table 10, wherein the units of the radius of curvature, the thickness and the focal length in table 9 are expressed in mm, and in table 10, k represents the conic constant, and A 4 , A 6 , A g , A 10 , A 12 , A 14  . . . : represent the high-order aspheric coefficients. In the tables 9 and 10, the surfaces 1 and 2 represent the object-side surface  511  and the image-side surface  512  of the first lens element  510 , respectively, the surfaces 3 and 4 represent the object-side surface  521  and the image-side surface  522  of the second lens element  520 , respectively, the surfaces 5 and 6 represent the object-side surface  531  and the image-side surface  532  of the third lens element  530 , respectively, the surfaces 7 and 8 represent the object-side surface  541  and the image-side surface  542  of the fourth lens element  540 , respectively, and the surfaces 9 and 10 represent the object-side surface  551  and the image-side surface  552  of the fifth lens element  550 , respectively. 
     
       
         
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
           
               
                 TABLE 9 
               
             
             
               
                   
               
               
                 (Embodiment 5) 
               
               
                 f (focal length) = 3.70 mm, Fno = 2.0, HFOV = 38.4 deg. 
               
             
          
           
               
                   
                   
                   
                   
                   
                   
                   
                 Focal 
               
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 index 
                 Abbe 
                 length 
               
               
                   
               
             
          
           
               
                 0 
                 Object 
                 Infinity 
                 Infinity 
                   
                   
                   
                   
               
               
                 1(stop) 
                 Lens 1 
                   1.71 (ASP) 
                 0.58 
                 Plastic 
                 1.544 
                 55.9 
                 2.64 
               
               
                 2 
                   
                  −8.03 (ASP) 
                 0.07 
                   
                   
                   
                   
               
               
                 3 
                 Lens 2  
                   7.45 (ASP) 
                 0.25 
                 Plastic 
                 1.632 
                 23.4 
                 −4.03 
               
               
                 4 
                   
                   1.88 (ASP) 
                 0.36 
                   
                   
                   
                   
               
               
                 5 
                 Lens 3 
                   7.95 (ASP) 
                 0.48 
                 Plastic 
                 1.544 
                 55.9 
                 11.95 
               
               
                 6 
                   
                 −35.00 (ASP) 
                 0.36 
                   
                   
                   
                   
               
               
                 7 
                 Lens 4 
                  −2.13 (ASP) 
                 0.53 
                 Plastic 
                 1.535 
                 55.5 
                 2.78 
               
               
                 8 
                   
                  −0.95 (ASP) 
                 0.15 
                   
                   
                   
                   
               
               
                 9 
                 Lens 5 
                 −50.00 (ASP) 
                 0.69 
                 Plastic 
                 1.515 
                 57.2 
                 −2.26 
               
               
                 10 
                   
                  1.19 (ASP) 
                 0.28 
                   
                   
                   
                   
               
               
                 11 
                 IR−filter 
                 Infinity 
                 0.21 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 12 
                   
                 Infinity 
                 0.62 
                   
                   
                   
                   
               
               
                 13 
                 Image 
                 Infinity 
                 — 
               
               
                   
               
             
          
         
       
     
     
       
         
               
             
               
               
               
               
               
               
             
           
               
                 TABLE 10 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Surface # 
                 1 
                 2 
                 3 
                 4 
                 5 
               
               
                   
               
               
                 k =  
                 −2.25E+00 
                  2.03E+01 
                  2.57E+00 
                 −7.86E+00 
                  2.02E+00 
               
               
                 A4 =  
                  4.69E−02 
                  5.36E−02  
                 −3.09E−02 
                  4.61E−02 
                 −8.05E−02 
               
               
                 A6 =  
                  1.06E−02  
                 −3.69E−02 
                  9.45E−02 
                  7.52E−02 
                  2.27E−02 
               
               
                 A8 =  
                 −6.85E−02 
                 −3.36E−02 
                 −1.01E−01 
                 −5.34E−02 
                 −3.03E−02 
               
               
                 A10 =  
                  7.13E−02 
                 −1.97E−02 
                 −4.47E−02 
                 −3.12E−04 
                  5.08E−02 
               
               
                 A12 =  
                 −2.65E−02 
                  5.37E−03 
                  5.11E−02  
                  1.40E−02 
                  1.28E−02 
               
               
                 A14 =  
                 −3.07E−02 
                 −4.90E−04 
                  1.49E−02 
                  6.20E−03 
                 −1.42E−02 
               
               
                 A16 = 
                   
                   
                   
                   
                   
               
               
                 A18 = 
               
               
                   
               
               
                 Surface # 
                 6 
                 7 
                 8 
                 9 
                 10 
               
               
                   
               
               
                 k =  
                 −4.00E+01 
                  1.95E+00 
                 −3.16E+00 
                  7.26E+00 
                 −7.56E+00 
               
               
                 A4 =  
                 −5.25E−02 
                  6.43E−02 
                 −6.98E−02 
                 −7.56E−02 
                 −6.30E−02 
               
               
                 A6 =  
                 −8.14E−04 
                  1.59E−02 
                  5.79E−02 
                  3.50E−03 
                  1.98E−02 
               
               
                 A8 =  
                 −2.25E−02 
                 −2.66E−02 
                 −1.34E−02 
                  6.01E−03 
                 −5.72E−03 
               
               
                 A10 =  
                 −1.35E−02 
                  1.34E−03 
                  8.55E−04 
                  1.38E−04  
                  8.41E−04 
               
               
                 A12 =  
                  2.53E−02  
                  5.33E−03 
                  9.27E−04  
                 −1.24E−03 
                 −2.32E−05 
               
               
                 A14 =  
                  1.50E−05  
                 −3.39E−03 
                 −1.19E−04 
                  3.95E−05 
                 −2.24E−05 
               
               
                 A16 =  
                   
                  3.73E−03 
                 −1.25E−04 
                  1.50E−04 
                  4.72E−06 
               
               
                 A18 =  
                   
                   
                   
                 −2.57E−05 
                 −3.34E−07 
               
               
                   
               
             
          
         
       
     
     Referring to  FIG. 6A , which shows an optical lens system in accordance with a sixth embodiment of the present invention, and  FIG. 6B  shows the longitudinal spherical aberration curves, the astigmatic field curves, and the distortion curve of the sixth embodiment of the present invention. An optical lens system in accordance with the sixth embodiment of the present invention comprises, in order from the object side to the image side: 
     A stop  600 . 
     A first lens element  610  with a positive refractive power made of plastic has a convex object-side surface  611  and a convex image-side surface  612 , and the object-side surface  611  and the image-side surface  612  of the first lens element  610  are aspheric. 
     A second lens element  620  with a negative refractive power made of plastic has an aspheric convex object-side surface  621 , and an aspheric concave image-side surface  622 . 
     A third lens element  630  with a positive refractive power made of plastic has an aspheric convex object-side surface  631 , and an aspheric convex image-side surface  632 . 
     A fourth lens element  640  with a positive refractive power made of plastic has aspheric concave object-side surface  641 , and an aspheric convex image-side surface  642 . 
     A fifth lens element  650  with a negative refractive power made of plastic has a concave object-side surface  651  and an image-side surface  652 , and the image-side surface  652  is concave near the optical axis, both of the object-side surface  651  and the image-side surface  652  are aspheric, and at least one inflection point is formed on the image-side surface  652 . 
     An IR filter  660  made of glass is located between the image-side surface  652  of the fifth lens element  650  and an image plane  690  and has no influence on the focal length of the optical lens system. 
     The equation for the aspheric surface profiles of the sixth embodiment is expressed as follows: 
     
       
         
           
             
               z 
               ⁡ 
               
                 ( 
                 h 
                 ) 
               
             
             = 
             
               
                 
                   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 
                 
               
               + 
               
                   
               
               ⁢ 
               ⋯ 
             
           
         
       
     
     z represents the distance of a point on the aspheric surface at a height h from the optical axis relative to a plane perpendicular to the optical axis at the vertex of the aspheric surface; 
     c is a paraxial curvature equal to 1/R (R: a paraxial radius of curvature); 
     h represents a vertical distance from the point on the curve of the aspheric surface to the optical axis; 
     k represents the conic constant;
         A 4 , A 6 , A g , A 10 , A 12 , A 14  . . . : represent the high-order aspheric coefficients.       

     In the sixth embodiment of the present optical lens system, the focal length of the optical lens system is f, the f-number of the optical lens system is Fno, half of the maximum angle of field of view of the present optical lens system is HFOV, the maximum angle of field of view of the present optical lens system is FOV, and they satisfy the conditions: f=3.57 (mm); Fno=2.2, HFOV=39.6 degrees, and FOV=79.2 degrees. 
     In the sixth embodiment of the present optical lens system, the focal length of the optical lens system is f, a focal length of the fourth lens element  640  is f4, and they satisfy the condition: f4/f=0.79. 
     In the sixth embodiment of the present optical lens system, the focal length of the optical lens system is f, a focal length of the fifth lens element  650  is f5, and they satisfy the condition: f5/f=−0.61. 
     In the sixth embodiment of the present optical lens system, a focal length of the first lens element  610  is f1, the focal length of the optical lens system is f, and they satisfy the condition: f1/f=0.78. 
     In the sixth embodiment of the present optical lens system, a focal length of the third lens element  630  is f3, the focal length of the optical lens system is f, and they satisfy the condition: f3/f=1.89. 
     In the sixth embodiment of the present optical lens system, a distance between the object-side surface  651  and the image-side surface  652  of the fifth lens element  650  along an optical axis  691  is D9, a distance between the object-side surface  641  and the image-side surface  642  of the fourth lens element  640  along the optical axis  691  is D7, the focal length of the optical lens system is f, and they satisfy the condition: (D9−D7)×10/f=0.85. 
     In the sixth embodiment of the present optical lens system, a radius of curvature of the object-side surface  641  of the fourth lens element  640  is R7, a radius of curvature of the image-side surface  642  of the fourth lens element  640  is R8, and they satisfy the condition: (R7−R8)/(R7+R8)=0.35. 
     In the sixth embodiment of the present optical lens system, a radius of curvature of the object-side surface  651  of the fifth lens element  650  is R9, the focal length of the optical lens system is f, and they satisfy the condition: |R9|/f=14.01. 
     In the sixth embodiment of the present optical lens system, a focal length of the second lens element  620  is f2, the focal length of the optical lens system is f, and they satisfy the condition: f2/f=−1.08. 
     In the sixth embodiment of the present optical lens system, a refraction index of the second lens element  620  is Nd2, and an Abbe number of the second lens element  620  is Vd2, and they satisfy the conditions: Nd2=1.632; Vd2=23.40. 
     In the sixth embodiment of the present optical lens system, a refraction index of the third lens element  630  is Nd3, and an Abbe number of the third lens element  630  is Vd3, and they satisfy the conditions: Nd3=1.544; Vd3=55.90. 
     In the sixth embodiment of the present optical lens system, a distance from the object-side surface  611  of the first lens element  610  to the image plane  690  along the optical axis  691  is TL, and a half of the maximum image height of the present optical lens system is ImgH, and they satisfy the condition: TL/ImgH=1.49. 
     The detailed optical data of the sixth embodiment is shown in table 11, and the aspheric surface data is shown in table 12, wherein the units of the radius of curvature, the thickness and the focal length in table 11 are expressed in mm, and in table 12, k represents the conic constant, and A 4 , A 6 , A 8 , A 10 , A 12 , A 14  . . . : represent the high-order aspheric coefficients. In the tables 11 and 12, the surfaces 1 and 2 represent the object-side surface  611  and the image-side surface  612  of the first lens element  610 , respectively, the surfaces 3 and 4 represent the object-side surface  621  and the image-side surface  622  of the second lens element  620 , respectively, the surfaces 5 and 6 represent the object-side surface  631  and the image-side surface  632  of the third lens element  630 , respectively, the surfaces 7 and 8 represent the object-side surface  641  and the image-side surface  642  of the fourth lens element  640 , respectively, and the surfaces 9 and 10 represent the object-side surface  651  and the image-side surface  652  of the fifth lens element  650 , respectively. 
     
       
         
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
           
               
                 TABLE 11 
               
             
             
               
                   
               
               
                 (Embodiment 6) 
               
               
                 f (focal length) = 3.57 mm, Fno = 2.2, HFOV = 39.6 deg. 
               
             
          
           
               
                   
                   
                   
                   
                   
                   
                   
                 Focal 
               
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 index 
                 Abbe 
                 length 
               
               
                   
               
             
          
           
               
                 0 
                 Object 
                 Infinity 
                 Infinity 
                   
                   
                   
                   
               
               
                 1(stop) 
                 Lens 1 
                  1.75 (ASP) 
                 0.51 
                 Plastic 
                 1.544 
                 55.9 
                 2.79 
               
               
                 2 
                   
                 −10.20 (ASP) 
                 0.09 
                   
                   
                   
                   
               
               
                 3 
                 Lens 2  
                  11.69 (ASP) 
                 0.24 
                 Plastic 
                 1.632 
                 23.4 
                 −3.86 
               
               
                 4 
                   
                   2.00 (ASP) 
                 0.23 
                   
                   
                   
                   
               
               
                 5 
                 Lens 3 
                   4.17 (ASP) 
                 0.46 
                 Plastic 
                 1.544 
                 55.9 
                 6.76 
               
               
                 6 
                   
                 −30.00 (ASP) 
                 0.45 
                   
                   
                   
                   
               
               
                 7 
                 Lens 4 
                  −1.93 (ASP) 
                 0.50 
                 Plastic 
                 1.535 
                 55.5 
                 2.83 
               
               
                 8 
                   
                  −0.92 (ASP) 
                 0.07 
                   
                   
                   
                   
               
               
                 9 
                 Lens 5 
                 −50.00 (ASP) 
                 0.80 
                 Plastic 
                 1.515 
                 55.2 
                 −2.17 
               
               
                 10 
                   
                  1.19 (ASP) 
                 0.29 
                   
                   
                   
                   
               
               
                 11 
                 IR−filter 
                 Infinity 
                 0.21 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 12 
                   
                 Infinity 
                 0.61 
                   
                   
                   
                   
               
               
                 13 
                 Image 
                 Infinity 
                 — 
               
               
                   
               
             
          
         
       
     
     
       
         
               
             
               
               
               
               
               
               
             
           
               
                 TABLE 12 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Surface # 
                 1 
                 2 
                 3 
                 4 
                 5 
               
               
                   
               
               
                 k = 
                 −2.26+00  
                  1.80E+01 
                  4.00E+01 
                 −1.12E+01 
                  2.00E−01 
               
               
                 A4 = 
                  4.34E−02 
                  5.10E−02 
                 −3.23E−02 
                  4.62E−02 
                 −8.47E−02 
               
               
                 A6 = 
                  1.73E−03 
                 −4.41E−02 
                  9.65E−02 
                  5.42E−02 
                  2.19E−02 
               
               
                 A8 = 
                 −5.68E−02 
                 −6.13E−02 
                 −1.70E−01 
                 −8.65E−02 
                 −2.44E−02 
               
               
                 A10 = 
                  8.13E−02 
                 −6.13E−02 
                 −7.95E−02 
                  9.85E−03 
                  4.60E−02 
               
               
                 A12 = 
                 −9.29E−02 
                  2.54E−02 
                  9.96E−02 
                  1.72E−02 
                  8.37E−03 
               
               
                 A14 = 
                 −7.79E−03 
                  2.43E−02 
                  5.61E−02 
                  1.29E−02 
                 −9.02E−03 
               
               
                 A16 = 
                   
                   
                   
                   
                   
               
               
                 A18 = 
               
               
                   
               
               
                 Surface # 
                 6 
                 7 
                 8 
                 9 
                 10 
               
               
                   
               
               
                 k = 
                  4.00E+01 
                  1.80E+00 
                 −3.21E+00 
                 −4.00E+01 
                 −7.46E+00 
               
               
                 A4 = 
                 −4.52E−02 
                  1.10E−01 
                 −8.26E−02 
                 −9.18E−02 
                 −7.18E−02 
               
               
                 A6 = 
                  2.69E−03 
                 −9.06E−03 
                  9.89E−02 
                  1.85E−03 
                  2.74E−02 
               
               
                 A8 = 
                 −8.29E−02 
                  1.28E−02 
                 −2.28E−02 
                  9.98E−03 
                 −9.46E−03 
               
               
                 A10 = 
                  1.97E−02 
                 −6.83E−03 
                 −6.96E−04 
                  9.33E−04 
                  1.77E−03 
               
               
                 A12 = 
                  4.53E−02 
                 −1.49E−02 
                  1.13E−03 
                 −2.36E−03 
                 −6.12E−05 
               
               
                 A14 = 
                 −1.06E−02 
                 −5.90E−03 
                 −1.38E−04 
                  8.82E−05 
                 −5.27E−05 
               
               
                 A16 = 
                   
                  1.58E−02 
                 −9.59E−05 
                  3.32E−04 
                  1.10E−05 
               
               
                 A18 = 
                   
                   
                   
                 −6.61E−05 
                 −7.28E−07 
               
               
                   
               
             
          
         
       
     
     Referring to  FIG. 7A , which shows an optical lens system in accordance with a seventh embodiment of the present invention, and  FIG. 7B  shows the longitudinal spherical aberration curves, the astigmatic field curves, and the distortion curve of the seventh embodiment of the present invention. An optical lens system in accordance with the seventh embodiment of the present invention comprises, in order from the object side to the image side: 
     A stop  700 . 
     A first lens element  710  with a positive refractive power made of plastic has a convex object-side surface  711  and a convex image-side surface  712 , and the object-side surface  711  and the image-side surface  712  of the first lens element  710  are aspheric. 
     A second lens element  720  with a negative refractive power made of plastic has an aspheric convex object-side surface  721 , and an aspheric concave image-side surface  722 . 
     A third lens element  730  with a positive refractive power made of plastic has a convex object-side surface  731  and an image-side surface  732 , and the image-side surface  732  is flat near the optical axis, both of object-side surface  731  and image-side surface  732  thereof being aspheric. 
     A fourth lens element  740  with a positive refractive power made of plastic has aspheric concave object-side surface  741 , and an aspheric convex image-side surface  742 . 
     A fifth lens element  750  with a negative refractive power made of plastic has a concave object-side surface  751  and an image-side surface  752 , and the image-side surface  752  is concave near the optical axis, both of the object-side surface  751  and the image-side surface  752  are aspheric, and at least one inflection point is formed on the image-side surface  752 . 
     An IR filter  760  made of glass is located between the image-side surface  752  of the fifth lens element  750  and an image plane  790  and has no influence on the focal length of the optical lens system. 
     The equation for the aspheric surface profiles of the seventh embodiment is expressed as follows: 
     
       
         
           
             
               z 
               ⁡ 
               
                 ( 
                 h 
                 ) 
               
             
             = 
             
               
                 
                   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 
                 
               
               + 
               
                   
               
               ⁢ 
               ⋯ 
             
           
         
       
     
     z represents the distance of a point on the aspheric surface at a height h from the optical axis relative to a plane perpendicular to the optical axis at the vertex of the aspheric surface; 
     c is a paraxial curvature equal to 1/R (R: a paraxial radius of curvature); 
     h represents a vertical distance from the point on the curve of the aspheric surface to the optical axis; 
     k represents the conic constant;
         A 4 , A 6 , A g , A 10 , A 12 , A 14  . . . : represent the high-order aspheric coefficients.       

     In the seventh embodiment of the present optical lens system, the focal length of the optical lens system is f, the f-number of the optical lens system is Fno, half of the maximum angle of field of view of the present optical lens system is HFOV, the maximum angle of field of view of the present optical lens system is FOV, and they satisfy the conditions: f=3.53 (mm); Fno=2.05, HFOV=39.9 degrees, and FOV=79.8 degrees. 
     In the seventh embodiment of the present optical lens system, the focal length of the optical lens system is f, a focal length of the fourth lens element  740  is f4, and they satisfy the condition: f4/f=0.63. 
     In the seventh embodiment of the present optical lens system, the focal length of the optical lens system is f, a focal length of the fifth lens element  750  is f5, and they satisfy the condition: f5/f=−0.56. 
     In the seventh embodiment of the present optical lens system, a focal length of the first lens element  710  is f1, the focal length of the optical lens system is f, and they satisfy the condition: f1/f=0.8. 
     In the seventh embodiment of the present optical lens system, a focal length of the third lens element  730  is f3, the focal length of the optical lens system is f, and they satisfy the condition: f3/f=2.30. 
     In the seventh embodiment of the present optical lens system, a distance between the object-side surface  751  and the image-side surface  752  of the fifth lens element  750  along an optical axis  791  is D9, a distance between the object-side surface  741  and the image-side surface  742  of the fourth lens element  740  along the optical axis  791  is D7, the focal length of the optical lens system is f, and they satisfy the condition: (D9−D7)×10/f=0.53. 
     In the seventh embodiment of the present optical lens system, a radius of curvature of the object-side surface  741  of the fourth lens element  740  is R7, a radius of curvature of the image-side surface  742  of the fourth lens element  740  is R8, and they satisfy the condition: (R7−R8)/(R7+R8)=0.44. 
     In the seventh embodiment of the present optical lens system, a radius of curvature of the object-side surface  751  of the fifth lens element  750  is R9, the focal length of the optical lens system is f, and they satisfy the condition: |R9|/f=11.33. 
     In the seventh embodiment of the present optical lens system, a focal length of the second lens element  720  is f2, the focal length of the optical lens system is f, and they satisfy the condition: f2/f=−1.10. 
     In the seventh embodiment of the present optical lens system, a refraction index of the second lens element  720  is Nd2, and an Abbe number of the second lens element  720  is Vd2, and they satisfy the conditions: Nd2=1.632; Vd2=23.40. 
     In the seventh embodiment of the present optical lens system, a refraction index of the third lens element  730  is Nd3, and an Abbe number of the third lens element  730  is Vd3, and they satisfy the conditions: Nd3=1.544; Vd3=55.90. 
     In the seventh embodiment of the present optical lens system, a distance from the object-side surface  711  of the first lens element  710  to the image plane  790  along the optical axis  791  is TL, and a half of the maximum image height of the present optical lens system is ImgH, and they satisfy the condition: TL/ImgH=1.52. 
     The detailed optical data of the seventh embodiment is shown in table 13, and the aspheric surface data is shown in table 14, wherein the units of the radius of curvature, the thickness and the focal length in table 13 are expressed in mm, and in table 14, k represents the conic constant, and A 4 , A 6 , A 8 , A 10 , A 12 , A 14  . . . : represent the high-order aspheric coefficients. In the tables 13 and 14, the surfaces 1 and 2 represent the object-side surface  711  and the image-side surface  712  of the first lens element  710 , respectively, the surfaces 3 and 4 represent the object-side surface  721  and the image-side surface  722  of the second lens element  720 , respectively, the surfaces 5 and 6 represent the object-side surface  731  and the image-side surface  732  of the third lens element  730 , respectively, the surfaces 7 and 8 represent the object-side surface  741  and the image-side surface  742  of the fourth lens element  740 , respectively, and the surfaces 9 and 10 represent the object-side surface  751  and the image-side surface  752  of the fifth lens element  750 , respectively. 
     
       
         
               
             
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
           
               
                 TABLE 13 
               
             
             
               
                   
               
               
                 (Embodiment 7) 
               
               
                 f (focal length) = 2.05 mm, Fno = 2.0, HFOV = 39.9 deg. 
               
             
          
           
               
                   
                   
                   
                   
                   
                   
                   
                 Focal 
               
               
                 Surface # 
                   
                 Curvature Radius 
                 Thickness 
                 Material 
                 index 
                 Abbe 
                 length 
               
               
                   
               
             
          
           
               
                 0 
                 Object 
                 Infinity 
                 Infinity 
                   
                   
                   
                   
               
               
                 1(stop) 
                 Lens 1 
                  1.89 (ASP) 
                 0.51 
                 Plastic 
                 1.544 
                 55.9 
                 2.84 
               
               
                 2 
                   
                  −7.71 (ASP) 
                 0.08 
                   
                   
                   
                   
               
               
                 3 
                 Lens 2  
                  6.47 (ASP) 
                 0.25 
                 Plastic 
                 1.632 
                 23.4 
                 −3.90 
               
               
                 4 
                   
                  1.76 (ASP) 
                 0.29 
                   
                   
                   
                   
               
               
                 5 
                 Lens 3 
                  4.42 (ASP) 
                 0.45 
                 Plastic 
                 1.544 
                 55.9 
                 8.12 
               
               
                 6 
                   
                 Infinity 
                 0.45 
                   
                   
                   
                   
               
               
                 7 
                 Lens 4 
                  −2.19 (ASP) 
                 0.56 
                 Plastic 
                 1.535 
                 55.5 
                 2.24 
               
               
                 8 
                   
                  −0.84 (ASP) 
                 0.03 
                   
                   
                   
                   
               
               
                 9 
                 Lens 5 
                 −40.00 (ASP) 
                 0.75 
                 Plastic 
                 1.515 
                 55.5 
                 −1.98 
               
               
                 10 
                   
                  1.09 (ASP) 
                 0.29 
                   
                   
                   
                   
               
               
                 11 
                 IR−filter 
                 Infinity 
                 0.21 
                 Glass 
                 1.517 
                 64.2 
                 — 
               
               
                 12 
                   
                 Infinity 
                 0.69 
                   
                   
                   
                   
               
               
                 13 
                 Image 
                 Infinity 
                 — 
               
               
                   
               
             
          
         
       
     
     
       
         
               
             
               
               
               
               
               
               
             
           
               
                 TABLE 14 
               
               
                   
               
               
                 Aspheric Coefficients 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Surface # 
                 1 
                 2 
                 3 
                 4 
                 5 
               
               
                   
               
               
                 k =  
                 −3.05E+00 
                 −4.00E+01 
                  8.38E+00 
                 −7.66E+00 
                  6.89E+00 
               
               
                 A4 =  
                  4.08E−02 
                  5.39E−02 
                 −3.40E−02 
                  3.14E−02 
                 −8.06E−02 
               
               
                 A6 =  
                   1.2E−02 
                 −3.93E−02 
                  1.03E−01 
                  6.96E−02 
                  1.78E−02 
               
               
                 A8 =  
                 −6.61E−02 
                 −1.35E−02 
                 −9.86E−02 
                 −5.75E−02 
                 −3.33E−02 
               
               
                 A10 =  
                  6.53E−02 
                 −4.49E−03 
                 −2.84E−02 
                 −1.01E−03 
                  5.14E−02 
               
               
                 A12 =  
                 −3.11E−02 
                  1.65E−03 
                  5.81E−02 
                  1.46E−02 
                  1.06E−02 
               
               
                 A14 =  
                 −4.25E−03 
                  4.12E−03  
                 −5.47E−03 
                 −2.65E−04 
                 −1.33E−02 
               
               
                 A16 =  
                   
                   
                   
                   
                   
               
               
                 A18 =  
               
               
                   
               
               
                 Surface # 
                 6 
                 7 
                 8 
                 9 
                 10 
               
               
                   
               
               
                 k =  
                  0.00E+00 
                  2.16E+00 
                 −3.11E+00 
                 −3.41E+01 
                 −7.64E+00 
               
               
                 A4 =  
                 −3.66E−02 
                  3.89E−02 
                 −9.39E−02 
                 −4.88E−02 
                 −6.44E−02 
               
               
                 A6 =  
                 −1.16E−02 
                  4.08E−02 
                  7.46E−02 
                 −5.01E−03 
                  2.40E−02 
               
               
                 A8 =  
                 −2.28E−02 
                 −1.94E−02 
                 −1.04E−02 
                  6.36E−03 
                 −7.99E−03 
               
               
                 A10 =  
                 −1.20E−02 
                 −1.72E−03 
                  4.06E−04 
                  2.52E−04 
                  1.47E−03 
               
               
                 A12 =  
                   2.64−02 
                  2.26E−03 
                  5.09E−04 
                 −1.19E−03 
                 −8.83E−05 
               
               
                 A14 =  
                  1.06E−03 
                 −3.62E−03 
                 −2.80E−04 
                  5.18E−05 
                 −2.59E−05 
               
               
                 A16 =  
                   
                  4.74E−03 
                 −7.95E−05 
                  1.49E−04 
                  5.92E−06 
               
               
                 A18 =  
                   
                   
                   
                 −2.74E−05 
                 −3.88E−07 
               
               
                   
               
             
          
         
       
     
     It is to be noted that the tables 1-14 show different data from the different embodiments, however, the data of the different embodiments are obtained from experiments. Therefore, any product of the same structure is deemed to be within the scope of the present invention even if it uses different data. Table 15 lists the relevant data for the various embodiments of the present invention. 
     
       
         
               
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
               
             
           
               
                   
               
               
                   
                 Embodiment 1 
                 Embodiment 2 
                 Embodiment 3 
                 Embodiment 4 
                 Embodiment 5 
                 Embodiment 6 
                 Embodiment 7 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 f 
                 3.54 
                 3.63 
                 3.56 
                 3.70 
                 3.70 
                 3.57 
                 3.53 
               
               
                 Fno 
                 2.05 
                 2.4 
                 2.05 
                 2.05 
                 2.0 
                 2.2 
                 2.05 
               
               
                 HFOV 
                 39 
                 39.4 
                 39.06 
                 38.6 
                 38.4 
                 39.6 
                 39.9 
               
               
                 FOV 
                 78 
                 78.8 
                 79.2 
                 77.2 
                 76.8 
                 79.2 
                 79.8 
               
               
                 f4/f 
                 0.62 
                 0.61 
                 0.65 
                 0.82 
                 0.75 
                 0.79 
                 0.63 
               
               
                 f5/f 
                 −0.53 
                 −0.54 
                 −0.55 
                 −0.63 
                 −0.61 
                 −0.61 
                 −0.56 
               
               
                 f1/f 
                 0.82 
                 0.85 
                 0.82 
                 0.77 
                 0.71 
                 0.78 
                 0.80 
               
               
                 f2/f 
                 −1.09 
                 −1.27 
                 −1.08 
                 −1.01 
                 −1.09 
                 −1.08 
                 −1.10 
               
               
                 f3/f 
                 1.93 
                 2.41 
                 1.91 
                 1.90 
                 3.23 
                 1.89 
                 2.30 
               
               
                 (D9 − 
                 0.41 
                 0.43 
                 0.20 
                 0.20 
                 0.42 
                 0.85 
                 0.53 
               
               
                 D7) × 10/ 
                   
                   
                   
                   
                   
                   
                   
               
               
                 f 
                   
                   
                   
                   
                   
                   
                   
               
               
                 (R7 − 
                 0.45 
                 0.39 
                 0.43 
                 0.36 
                 0.38 
                 0.35 
                 0.44 
               
               
                 R8)/(R7 + 
                   
                   
                   
                   
                   
                   
                   
               
               
                 R8) 
                   
                   
                   
                   
                   
                   
                   
               
               
                 |R9|/f 
                 11.30 
                 4.32 
                 11.24 
                 7.37 
                 13.51 
                 14.01 
                 11.33 
               
               
                 Nd2 
                 1.632 
                 1.632 
                 1.632 
                 1.632 
                 1.632 
                 1.632 
                 1.632 
               
               
                 Vd2 
                 23.40 
                 23.40 
                 23.40 
                 23.40 
                 23.40 
                 23.40 
                 23.40 
               
               
                 Nd3 
                 1.544 
                 1.515 
                 1.544 
                 1.544 
                 1.544 
                 1.544 
                 1.544 
               
               
                 Vd3 
                 55.90 
                 57.20 
                 55.90 
                 55.90 
                 55.90 
                 55.90 
                 55.90 
               
               
                 TL/ImgH 
                 1.58 
                 1.57 
                 1.52 
                 1.52 
                 1.52 
                 1.49 
                 1.52 
               
               
                   
               
             
          
         
       
     
     In the present optical lens system, the respective lens elements can be made of glass or plastic. It can effectively reduce manufacturing cost if the lens elements are made of plastic. 
     While we have shown and described various embodiments in accordance with the present invention, it is clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.