Patent Publication Number: US-2021181466-A1

Title: Wide-Angle Lens Assembly

Description:
BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The invention relates to a wide-angle lens assembly. 
     Description of the Related Art 
     The current development trend of a wide-angle lens assembly is toward large field of view. Additionally, the wide-angle lens assembly is developed to have high resolution and resistance to environmental temperature change in accordance with different application requirements. However, the known wide-angle lens assembly can&#39;t satisfy such requirements. Therefore, the wide-angle lens assembly needs a new structure in order to meet the requirements of large field of view, high resolution, and resistance to environmental temperature change at the same time. 
     BRIEF SUMMARY OF THE INVENTION 
     The invention provides a wide-angle lens assembly to solve the above problems. The wide-angle lens assembly of the invention is provided with characteristics of an increased field of view, an increased resolution, a resisted environmental temperature change, and still has a good optical performance. 
     The wide-angle lens assembly in accordance with an exemplary embodiment of the invention includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens, all of which are arranged in order from an object side to an image side along an optical axis. The first lens is a meniscus lens with negative refractive power. The second lens is a meniscus lens with negative refractive power. The third lens is with negative refractive power. The fourth lens is with refractive power and includes a concave surface facing the object side. The fifth lens is with positive refractive power. The sixth lens is with positive refractive power. The seventh lens is with refractive power and includes a concave surface facing the object side. The eighth lens is with positive refractive power. The ninth lens is with negative refractive power. The tenth lens is with refractive power and includes a concave surface facing the image side. The wide-angle lens assembly satisfies: 6&lt;f 5 /f&lt;8.5; wherein f 5  is an effective focal length in mm of the fifth lens and f is an effective focal length in mm of the wide-angle lens assembly. 
     In another exemplary embodiment, the first lens includes a convex surface facing the object side and a concave surface facing the image side, the second lens includes a convex surface facing the object side and a concave surface facing the image side, the third lens includes a concave surface facing the object side and a convex surface facing the image side, the fourth lens is with positive refractive power and further includes a convex surface facing the image side, the fifth lens includes a convex surface facing the object side and another convex surface facing the image side, the sixth lens includes a convex surface facing the object side and another convex surface facing the image side, the seventh lens is with positive refractive power and further includes a convex surface facing the image side, the eighth lens includes a convex surface facing the object side and another convex surface facing the image side, the ninth lens includes a concave surface facing the object side and a convex surface or a plane surface facing the image side, and the tenth lens is with positive refractive power and further includes a convex surface facing the object side. 
     In yet another exemplary embodiment, the third lens and the fourth lens are cemented and the eighth lens and the ninth lens are cemented. 
     In another exemplary embodiment, the wide-angle lens assembly satisfies at least one of the following conditions: 0.7&lt;TTL/θ&lt;0.82; 11&lt;TTL/f&lt;14; 12.03&lt;TTL/f&lt;12.93; 0.74&lt;TTL/θ&lt;0.79; 6.31&lt;f 5 /f&lt;7.98; wherein TTL is an interval in mm from an object side surface of the first lens to an image plane along the optical axis, θ is a half field of view in degree for the wide-angle lens assembly, f 5  is the effective focal length in mm of the fifth lens, and f is the effective focal length in mm of the wide-angle lens assembly. 
     The wide-angle lens assembly in accordance with another exemplary embodiment of the invention includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens, all of which are arranged in order from an object side to an image side along an optical axis. The first lens is a meniscus lens with negative refractive power. The second lens is a meniscus lens with negative refractive power. The third lens is with refractive power. The fourth lens is with refractive power. The fifth lens is with positive refractive power. The sixth lens is with positive refractive power. The seventh lens is with refractive power and includes a concave surface facing the object side. The eighth lens is with refractive power. The ninth lens is with refractive power. The tenth lens is with refractive power and includes a concave surface facing the image side. The wide-angle lens assembly satisfies: 0.7&lt;TTL/θ&lt;0.82; wherein TTL is an interval in mm from an object side surface of the first lens to an image plane along the optical axis and θ is a half field of view in degree for the wide-angle lens assembly. 
     In another exemplary embodiment, the third lens is with negative refractive power, the fourth lens is with positive refractive power and includes a concave surface facing the object side and a convex surface facing the image side, the seventh lens is with positive refractive power and further includes a convex surface facing the image side, the eighth lens which is with positive refractive power, the ninth lens which is with negative refractive power, the tenth lens is with positive refractive power and further includes a convex surface facing the object side. 
     In yet another exemplary embodiment, the first lens includes a convex surface facing the object side and a concave surface facing the image side, the second lens includes a convex surface facing the object side and a concave surface facing the image side, the third lens includes a concave surface facing the object side and a convex surface facing the image side, the fifth lens includes a convex surface facing the object side and another convex surface facing the image side, the sixth lens includes a convex surface facing the object side and another convex surface facing the image side, the eighth lens includes a convex surface facing the object side and another convex surface facing the image side, the ninth lens includes a concave surface facing the object side. 
     In another exemplary embodiment, the ninth lens includes a convex surface or a plane surface facing the image side. 
     In yet another exemplary embodiment, the third lens and the fourth lens are cemented to form a lens with negative refractive power. 
     In another exemplary embodiment, the eighth lens and the ninth lens are cemented to form a lens with negative refractive power. 
     In yet another exemplary embodiment, the wide-angle lens assembly satisfies at least one of the following conditions: 11&lt;TTL/f&lt;14; 6&lt;f 5 /f&lt;8.5; wherein TTL is the interval in mm from the object side surface of the first lens to the image plane along the optical axis, f 5  is an effective focal length in mm of the fifth lens, and f is an effective focal length in mm of the wide-angle lens assembly. 
     In another exemplary embodiment, the wide-angle lens assembly satisfies at least one of the following conditions: 12.03&lt;TTL/f&lt;12.93; 0.74&lt;TTL/θ&lt;0.79; 6.31&lt;f 5 /f&lt;7.98; wherein TTL is the interval in mm from the object side surface of the first lens to the image plane along the optical axis, θ is the half field of view in degree for the wide-angle lens assembly, f 5  is the effective focal length in mm of the fifth lens, and f is the effective focal length in mm of the wide-angle lens assembly. 
     The wide-angle lens assembly in accordance with yet another exemplary embodiment of the invention includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens, all of which are arranged in order from an object side to an image side along an optical axis. The first lens is a meniscus lens with negative refractive power. The second lens is a meniscus lens with negative refractive power. The third lens is with refractive power. The fourth lens is with refractive power. The fifth lens is with positive refractive power. The sixth lens is with positive refractive power. The seventh lens is with refractive power and includes a concave surface facing the object side. The eighth lens is with refractive power. The ninth lens is with refractive power. The tenth lens is with refractive power and includes a concave surface facing the image side. The wide-angle lens assembly satisfies: 11&lt;TTL/f&lt;14; wherein TTL is an interval in mm from an object side surface of the first lens to an image plane along the optical axis and f is an effective focal length in mm of the wide-angle lens assembly. 
     In another exemplary embodiment, the fourth lens is with positive refractive power and includes a convex surface facing the image side, the seventh lens is with positive refractive power and further includes a convex surface facing the image side, the tenth lens is with positive refractive power and further includes a convex surface facing the object side. 
     In yet another exemplary embodiment, the first lens includes a convex surface facing the object side and a concave surface facing the image side, the second lens includes a convex surface facing the object side and a concave surface facing the image side, the third lens includes a concave surface facing the object side and a convex surface facing the image side, the fifth lens includes a convex surface facing the object side and another convex surface facing the image side, the sixth lens includes a convex surface facing the object side and another convex surface facing the image side, the eighth lens includes a convex surface facing the object side and another convex surface facing the image side, the ninth lens includes a concave surface facing the object side. 
     In another exemplary embodiment, the ninth lens includes a convex surface or a plane surface facing the image side. 
     In yet another exemplary embodiment, the third lens is with negative refractive power, the fourth lens includes a concave surface facing the object side, the eighth lens which is with positive refractive power, the ninth lens which is with negative refractive power. 
     In another exemplary embodiment, the wide-angle lens assembly satisfies at least one of the following conditions: 6&lt;f 5 /f&lt;8.5; 0.7&lt;TTL/θ&lt;0.82; wherein TTL is the interval in mm from the object side surface of the first lens to the image plane along the optical axis, θ is a half field of view in degree for the wide-angle lens assembly, f 5  is an effective focal length in mm of the fifth lens, and f is the effective focal length in mm of the wide-angle lens assembly. 
     A detailed description is given in the following embodiments with reference to the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention can be more fully understood by reading the subsequent detailed description and examples with references made to the accompanying drawings, wherein: 
         FIG. 1  is a lens layout and optical path diagram of a wide-angle lens assembly in accordance with a first embodiment of the invention; 
         FIG. 2A  depicts a field curvature diagram of the wide-angle lens assembly in accordance with the first embodiment of the invention; 
         FIG. 2B  is a distortion diagram of the wide-angle lens assembly in accordance with the first embodiment of the invention; 
         FIGS. 2C-2E  are spot diagrams of the wide-angle lens assembly in accordance with the first embodiment of the invention; 
         FIG. 2F  is a through focus modulation transfer function diagram of the wide-angle lens assembly in accordance with the first embodiment of the invention; 
         FIG. 3  is a lens layout and optical path diagram of a wide-angle lens assembly in accordance with a second embodiment of the invention; 
         FIG. 4A  depicts a field curvature diagram of the wide-angle lens assembly in accordance with the second embodiment of the invention; 
         FIG. 4B  is a distortion diagram of the wide-angle lens assembly in accordance with the second embodiment of the invention; 
         FIGS. 4C-4E  are spot diagrams of the wide-angle lens assembly in accordance with the second embodiment of the invention; 
         FIG. 4F  is a through focus modulation transfer function diagram of the wide-angle lens assembly in accordance with the second embodiment of the invention. 
         FIG. 5  is a lens layout and optical path diagram of a wide-angle lens assembly in accordance with a third embodiment of the invention; 
         FIG. 6A  depicts a field curvature diagram of the wide-angle lens assembly in accordance with the third embodiment of the invention; 
         FIG. 6B  is a distortion diagram of the wide-angle lens assembly in accordance with the third embodiment of the invention; 
         FIGS. 6C-6E  are spot diagrams of the wide-angle lens assembly in accordance with the third embodiment of the invention; and 
         FIG. 6F  is a through focus modulation transfer function diagram of the wide-angle lens assembly in accordance with the third embodiment of the invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The following description is made for the purpose of illustrating the general principles of the invention and should not be taken in a limiting sense. The scope of the invention is best determined by reference to the appended claims. 
     The present invention provides a wide-angle lens assembly including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens. The first lens is a meniscus lens with negative refractive power. The second lens is a meniscus lens with negative refractive power. The third lens is with negative refractive power. The fourth lens is with refractive power and includes a concave surface facing an object side. The fifth lens is with positive refractive power. The sixth lens is with positive refractive power. The seventh lens is with refractive power and includes a concave surface facing the object side. The eighth lens is with positive refractive power. The ninth lens is with negative refractive power. The tenth lens is with refractive power and includes a concave surface an image side. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, and the tenth lens are arranged in order from the object side to the image side along an optical axis. The wide-angle lens assembly satisfies: 6&lt;f 5 /f&lt;8.5; wherein f 5  is an effective focal length of the fifth lens and f is an effective focal length of the wide-angle lens assembly. 
     The present invention provides another wide-angle lens assembly including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens. The first lens is a meniscus lens with negative refractive power. The second lens is a meniscus lens with negative refractive power. The third lens is with refractive power. The fourth lens is with refractive power. The fifth lens is with positive refractive power. The sixth lens is with positive refractive power. The seventh lens is with refractive power and includes a concave surface facing an object side. The eighth lens is with refractive power. The ninth lens is with refractive power. The tenth lens is with refractive power and includes a concave surface an image side. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, and the tenth lens are arranged in order from the object side to the image side along an optical axis. The wide-angle lens assembly satisfies: 0.7&lt;TTL/θ&lt;0.82; wherein TTL is an interval in mm from an object side surface of the first lens to an image plane along the optical axis and θ is a half field of view in degree for the wide-angle lens assembly. 
     The present invention provides yet another wide-angle lens assembly including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens. The first lens is a meniscus lens with negative refractive power. The second lens is a meniscus lens with negative refractive power. The third lens is with refractive power. The fourth lens is with refractive power. The fifth lens is with positive refractive power. The sixth lens is with positive refractive power. The seventh lens is with refractive power and includes a concave surface facing an object side. The eighth lens is with refractive power. The ninth lens is with refractive power. The third lens and the fourth lens are cemented. The eighth lens and the ninth lens are cemented. The tenth lens is with refractive power and includes a concave surface an image side. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, and the tenth lens are arranged in order from the object side to the image side along an optical axis. The wide-angle lens assembly satisfies: 11&lt;TTL/f&lt;14; wherein TTL is an interval in mm from an object side surface of the first lens to an image plane along the optical axis and f is an effective focal length in mm of the wide-angle lens assembly. 
     Referring to Table 1, Table 2, Table 4, Table 5, Table 7, and Table 8, wherein Table 1, Table 4, and Table 7 show optical specification in accordance with a first, second, and third embodiments of the invention respectively and Table 2, Table 5, and Table 8 show aspheric coefficient of each aspheric lens in Table 1, Table 4, and Table 7 respectively. 
       FIG. 1 ,  FIG. 3 , and  FIG. 5  are lens layout and optical path diagrams of the wide-angle lens assembly in accordance with the first, second, and third embodiments of the invention respectively. 
     The first lens L 11 , L 21 , L 31  are meniscus lenses with negative refractive power and made of glass material, wherein the object side surfaces S 11 , S 21 , S 31  are convex surfaces, the image side surfaces S 12 , S 22 , S 32  are concave surfaces, and the object side surfaces S 11 , S 21 , S 31  and the image side surfaces S 12 , S 22 , S 32  are spherical surfaces. 
     The second lens L 12 , L 22 , L 32  are meniscus lenses with negative refractive power and made of glass material, wherein the object side surfaces S 13 , S 23 , S 33  are convex surfaces, the image side surfaces S 14 , S 24 , S 34  are concave surfaces, and the object side surfaces S 13 , S 23 , S 33  and the image side surfaces S 14 , S 24 , S 34  are spherical surfaces. 
     The third lens L 13 , L 23 , L 33  are meniscus lenses with negative refractive power and made of glass material, wherein the object side surfaces S 15 , S 25 , S 35  are concave surfaces, the image side surfaces S 16 , S 26 , S 36  are convex surfaces, and the object side surfaces S 15 , S 25 , S 35  and the image side surfaces S 16 , S 26 , S 36  are spherical surfaces. 
     The fourth lens L 14 , L 24 , L 34  are meniscus lenses with positive refractive power and made of glass material, wherein the object side surfaces S 16 , S 26 , S 36  are concave surfaces, the image side surfaces S 17 , S 27 , S 37  are convex surfaces, and the object side surfaces S 16 , S 26 , S 36  and the image side surfaces S 17 , S 27 , S 37  are spherical surfaces. 
     The fifth lens L 15 , L 25 , L 35  are biconvex lenses with positive refractive power and made of glass material, wherein the object side surfaces S 18 , S 28 , S 38  are convex surfaces, the image side surfaces S 19 , S 29 , S 39  are convex surfaces, and the object side surfaces S 18 , S 28 , S 38  and the image side surfaces S 19 , S 29 , S 39  are spherical surfaces. 
     The sixth lens L 16 , L 26 , L 36  are biconvex lenses with positive refractive power and made of glass material, wherein the object side surfaces S 111 , S 211 , S 311  are convex surfaces, the image side surfaces S 112 , S 212 , S 312  are convex surfaces, and the object side surfaces S 111 , S 211 , S 311  and the image side surfaces S 112 , S 212 , S 312  are spherical surfaces. 
     The seventh lens L 17 , L 27 , L 37  are meniscus lenses with positive refractive power and made of glass material, wherein the object side surfaces S 113 , S 213 , S 313  are concave surfaces, the image side surfaces S 114 , S 214 , S 314  are convex surfaces, and the object side surfaces S 113 , S 213 , S 313  and the image side surfaces S 114 , S 214 , S 314  are spherical surfaces. 
     The eighth lens L 18 , L 28 , L 38  are biconvex lenses with positive refractive power and made of glass material, wherein the object side surfaces S 115 , S 215 , S 315  are convex surfaces, the image side surfaces S 116 , S 216 , S 316  are convex surfaces, and the object side surfaces S 115 , S 215 , S 315  and the image side surfaces S 116 , S 216 , S 316  are spherical surfaces. 
     The ninth lens L 19 , L 29 , L 39  are with negative refractive power and made of glass material, wherein the object side surfaces S 116 , S 216 , S 316  are concave surfaces and the object side surfaces S 116 , S 216 , S 316  are spherical surfaces. 
     The tenth lens L 110 , L 210 , L 310  are meniscus lenses with positive refractive power and made of glass material, wherein the object side surfaces S 118 , S 218 , S 318  are convex surfaces, the image side surfaces S 119 , S 219 , S 319  are concave surfaces, and the object side surfaces S 118 , S 218 , S 318  and the image side surfaces S 119 , S 219 , S 319  are aspheric surfaces. 
     The third lenses L 13 , L 23 , L 33  and the fourth lenses L 14 , L 24 , L 34  are cemented to form a lens with negative refractive power respectively. 
     The eighth lenses L 18 , L 28 , L 38  and the ninth lenses L 19 , L 29 , L 39  are cemented to form a lens with negative refractive power respectively. 
     In addition, the wide-angle lens assembly  1 ,  2 ,  3  satisfy at least one of the following conditions: 
       11&lt; TTL/f&lt; 14;  (1)
 
       0.7&lt; TTL/θ&lt; 0.82;  (2)
 
       6&lt; f   5   /f&lt; 8.5;  (3)
 
       12.03&lt; TTL/f&lt; 12.93;  (4)
 
       0.74&lt; TTL/θ&lt; 0.79;  (5)
 
       6.31&lt; f   5   /f&lt; 7.98;  (6)
 
     wherein f is an effective focal length of the wide-angle lens assemblies  1 ,  2 ,  3  for the first to third embodiments, f 5  is an effective focal length of the fifth lenses L 15 , L 25 , L 35  for the first to third embodiments, TTL is an interval in mm from the object side surfaces S 11 , S 21 , S 31  of the first lenses L 11 , L 21 , L 31  to the image planes IMA 1 , IMA 2 , IMA 3  along the optical axes OA 1 , OA 2 , OA 3  respectively for the first to third embodiments, and θ is a half field of view in degree of the wide-angle lens assemblies  1 ,  2 ,  3  for the first to third embodiments. With the wide-angle lens assemblies  1 ,  2 ,  3  satisfying at least one of the above conditions (1)-(6), the field of view can be effectively increased, the resolution can be effectively increased, the environmental temperature change can be effectively resisted, the aberration can be effectively corrected, and the chromatic aberration can be effectively corrected. 
     The best condition of miniaturization for the wide-angle lens assemblies  1 ,  2 , and  3  is as the condition (1): 11&lt;TTL/f&lt;14 is satisfied. 
     A detailed description of a wide-angle lens assembly in accordance with a first embodiment of the invention is as follows. Referring to  FIG. 1 , the wide-angle lens assembly  1  includes a first lens L 11 , a second lens L 12 , a third lens L 13 , a fourth lens L 14 , a fifth lens L 15 , a stop ST 1 , a sixth lens L 16 , a seventh lens L 17 , an eighth lens L 18 , a ninth lens L 19 , a tenth lens L 110 , an optical filter OF 1 , and a cover glass CG 1 , all of which are arranged in order from an object side to an image side along an optical axis OA 1 . In operation, an image of light rays from the object side is formed at an image plane IMA 1 . 
     According to paragraphs [0029]-[0044], wherein: the ninth lens L 19  is a plane-concave lens, wherein the image side surface S 17  is a plane surface; both of the object side surface S 120  and image side surface S 121  of the optical filter OF 1  are plane surfaces; and both of the object side surface S 122  and image side surface S 23  of the cover glass CG 1  are plane surfaces. 
     With the above design of the lenses and stop ST 1  and at least any one of the conditions (1)-(6) satisfied, the wide-angle lens assembly  1  can have an effective increased field of view, an effective increased resolution, an effective resisted environmental temperature change, an effective corrected aberration, and is capable of an effective corrected chromatic aberration. 
     Table 1 shows the optical specification of the wide-angle lens assembly  1  in  FIG. 1 . 
     
       
         
           
               
               
             
               
                 TABLE 1 
               
               
                   
               
             
            
               
                 Effective Focal Length = 5.47 mm 
                 F-number = 2.8 
               
               
                 Total Lens Length = 67.96 mm 
                 Field of View = 178.2 degrees 
               
            
           
           
               
            
               
                 Effective Focal Length of A Combination of The Third Lens and The Fourth Lens = −128.29 mm 
               
               
                 Effective Focal Length of A Combination of The Eighth Lens and The Ninth Lens = −107.7 mm 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                   
                 Radius of 
                   
                   
                   
                 Effective 
                   
               
               
                 Surface 
                 Curvature 
                 Thickness 
                   
                   
                 Focal Length 
               
               
                 Number 
                 (mm) 
                 (mm) 
                 Nd 
                 Vd 
                 (mm) 
                 Remark 
               
               
                   
               
               
                 S11 
                 46.78 
                 3.23 
                 1.5935 
                 67.3266 
                 −33.14 
                 The First Lens L11 
               
               
                 S12 
                 13.51 
                 7.63 
               
               
                 S13 
                 57.79 
                 3.08 
                 1.5168 
                 64.2124 
                 −18.16 
                 The Second Lens L12 
               
               
                 S14 
                 7.95 
                 7.37 
               
               
                 S15 
                 −11.37 
                 5.82 
                 1.8467 
                 23.7848 
                 −17.51 
                 The Third Lens L13 
               
               
                 S16 
                 −58.97 
                 2.45 
                 1.8042 
                 46.5025 
                 27.18 
                 The Fourth Lens L14 
               
               
                 S17 
                 −16.28 
                 0.21 
               
               
                 S18 
                 47.28 
                 1.99 
                 1.8467 
                 23.7848 
                 34.54 
                 The Fifth Lens L15 
               
               
                 S19 
                 −76.54 
                 5.20 
               
               
                 S110 
                 ∞ 
                 2.14 
                   
                   
                   
                 Stop ST1 
               
               
                 S111 
                 20.02 
                 2.31 
                 1.497 
                 81.6084 
                 22.27 
                 The Sixth Lens L16 
               
               
                 S112 
                 −23.92 
                 1.26 
               
               
                 S113 
                 −12.48 
                 4.83 
                 1.497 
                 81.6084 
                 137.07 
                 The Seventh Lens L17 
               
               
                 S114 
                 −11.91 
                 0.23 
               
               
                 S115 
                 23.99 
                 4.13 
                 1.497 
                 81.6084 
                 15.88 
                 The Eighth Lens L18 
               
               
                 S116 
                 −11.12 
                 1.14 
                 1.8467 
                 23.7848 
                 −13.05 
                 The Ninth Lens L19 
               
               
                 S117 
                 ∞ 
                 5.21 
               
               
                 S118 
                 11.83 
                 4.23 
                 1.5163 
                 64.0485 
                 29.83 
                 The Tenth Lens L110 
               
               
                 S119 
                 44.33 
                 2.60 
               
               
                 S120 
                 ∞ 
                 0.84 
                 1.5168 
                 64.1673 
                   
                 Optical Filter OF1 
               
               
                 S121 
                 ∞ 
                 0.30 
               
               
                 S122 
                 ∞ 
                 0.50 
                 1.5168 
                 64.1673 
                   
                 Cover Glass CG1 
               
               
                 S123 
                 ∞ 
                 1.27 
               
               
                   
               
            
           
         
       
     
     The aspheric surface sag z of each aspheric lens in table 1 can be calculated by the following formula: 
         z=ch   2 /{1+[1−( k+ 1) c   2   h   2 ] 1/2   }+Ah   4   +Bh   6   +Ch   8   +Dh   10   +Eh   12   +Fh   14   +Gh   16  
 
     where c is curvature, h is the vertical distance from the lens surface to the optical axis, k is conic constant and A, B, C, D, E, F, and G are aspheric coefficients. 
     In the first embodiment, the conic constant k and the aspheric coefficients A, B, C, D, E, F, G of each aspheric surface are shown in Table 2. 
     
       
         
           
               
               
               
               
               
               
             
               
                 TABLE 2 
               
               
                   
               
             
            
               
                 Surface 
                   
                 A 
                 B 
                 C 
                 D 
               
               
                 Number 
                 k 
                 E 
                 F 
                 G 
               
               
                   
               
               
                 S118 
                 0.653887 
                 −0.00025480529 
                 4.6062791e−006 
                 −1.5533633e−007  
                 1.8626694e−009 
               
               
                   
                   
                 −1.0205332e−011 
                 0 
                 0 
               
               
                 S119 
                 26.11172 
                 −0.0003478338  
                 1.3563294e−005 
                 −5.088771e−007 
                 1.1451564e−008 
               
               
                   
                   
                 −1.6955825e−010 
                 1.5315513e−012 
                 −6.272345e−015 
               
               
                   
               
            
           
         
       
     
     Table 3 shows the parameters and condition values for conditions (1)-(6) in accordance with the first embodiment of the invention. It can be seen from Table 3 that the wide-angle lens assembly  1  of the first embodiment satisfies the conditions (1)-(6). 
     
       
         
           
               
               
               
               
               
               
               
             
               
                   
                 TABLE 3 
               
               
                   
                   
               
             
            
               
                   
                 θ 
                 89.08 degrees 
                   
                   
                   
                   
               
               
                   
                 TTL/f 
                 12.425 
                 TTL/θ 
                 0.763 
                 f 5 /f 
                 6.314 
               
               
                   
                   
               
            
           
         
       
     
     By the above arrangements of the lenses and stop ST 1 , the wide-angle lens assembly  1  of the first embodiment can meet the requirements of optical performance as seen in  FIGS. 2A-2F . 
     It can be seen from  FIG. 2A  that the field curvature of tangential direction and sagittal direction in the wide-angle lens assembly  1  of the first embodiment ranges from −0.02 mm to 0.06 mm. It can be seen from  FIG. 2B  that the distortion in the wide-angle lens assembly  1  of the first embodiment ranges from −7% to 0%. It can be seen from  FIGS. 2C-2E  that the root mean square spot radius is equal to 0.861 μm and geometrical spot radius is equal to 1.892 μm as image height is equal to 0.000 mm, the root mean square spot radius is equal to 1.460 μm and geometrical spot radius is equal to 4.518 μm as image height is equal to 3.965 mm, and the root mean square spot radius is equal to 6.095 μm and geometrical spot radius is equal to 22.194 μm as image height is equal to 7.930 mm for the lens assembly  1  of the first embodiment. It can be seen from  FIG. 2F  that the through focus modulation transfer function of tangential direction and sagittal direction in the lens assembly  1  of the first embodiment ranges from 0.0 to 0.78 as focus shift ranges from −0.05 mm to 0.05 mm. 
     It is obvious that the field curvature and the distortion of the wide-angle lens assembly  1  of the first embodiment can be corrected effectively, and the resolution and the depth of focus of the wide-angle lens assembly  1  of the first embodiment can meet the requirement. Therefore, the wide-angle lens assembly  1  of the first embodiment is capable of good optical performance. 
     Referring to  FIG. 3 ,  FIG. 3  is a lens layout and optical path diagram of a wide-angle lens assembly in accordance with a second embodiment of the invention. the wide-angle lens assembly  2  includes a first lens L 21 , a second lens L 22 , a third lens L 23 , a fourth lens L 24 , a fifth lens L 25 , a stop ST 2 , a sixth lens L 26 , a seventh lens L 27 , an eighth lens L 28 , a ninth lens L 29 , a tenth lens L 210 , an optical filter OF 2 , and a cover glass CG 2 , all of which are arranged in order from an object side to an image side along an optical axis OA 2 . In operation, an image of light rays from the object side is formed at an image plane IMA 2 . 
     According to paragraphs [0029]-[0044], wherein: the ninth lens L 29  is a meniscus lens, wherein the image side surface S 217  is a convex surface and the object side surface S 216  and the image side surface S 217  are spherical surfaces; both of the object side surface S 220  and image side surface S 221  of the optical filter OF 2  are plane surfaces; and both of the object side surface S 222  and image side surface S 223  of the cover glass CG 2  are plane surfaces. 
     With the above design of the lenses and stop ST 2  and at least any one of the conditions (1)-(6) satisfied, the wide-angle lens assembly  2  can have an effective increased field of view, an effective increased resolution, an effective resisted environmental temperature change, an effective corrected aberration, and is capable of an effective corrected chromatic aberration. 
     Table 4 shows the optical specification of the wide-angle lens assembly  2  in  FIG. 3 . 
     
       
         
           
               
               
             
               
                 TABLE 4 
               
               
                   
               
             
            
               
                 Effective Focal Length = 5.49 mm 
                 F-number = 2.8 
               
               
                 Total Lens Length = 66.07 mm 
                 Field of View = 178 degrees 
               
            
           
           
               
            
               
                 Effective Focal Length of A Combination of The Third Lens and The Fourth Lens = −229.24 mm 
               
               
                 Effective Focal Length of A Combination of The Eighth Lens and The Ninth Lens = −165.49 mm 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                   
                 Radius of 
                   
                   
                   
                 Effective 
                   
               
               
                 Surface 
                 Curvature 
                 Thickness 
                   
                   
                 Focal Length 
               
               
                 Number 
                 (mm) 
                 (mm) 
                 Nd 
                 Vd 
                 (mm) 
                 Remark 
               
               
                   
               
               
                 S21 
                 47.79 
                 2.67 
                 1.497 
                 81.6084 
                 −29.79 
                 The First Lens L21 
               
               
                 S22 
                 11.11 
                 7.38 
               
               
                 S23 
                 38.88 
                 1.50 
                 1.5168 
                 64.1673 
                 −18.58 
                 The Second Lens L22 
               
               
                 S24 
                 7.58 
                 6.31 
               
               
                 S25 
                 −10.62 
                 3.88 
                 1.8467 
                 23.7848 
                 −16.58 
                 The Third Lens L23 
               
               
                 S26 
                 −49.92 
                 3.08 
                 1.8042 
                 46.5025 
                 23.35 
                 The Fourth Lens L24 
               
               
                 S27 
                 −14.06 
                 0.15 
               
               
                 S28 
                 80.84 
                 5.83 
                 1.8467 
                 23.7848 
                 37.95 
                 The Fifth Lens L25 
               
               
                 S29 
                 −52.13 
                 3.18 
               
               
                 S210 
                 ∞ 
                 2.04 
                   
                   
                   
                 Stop ST2 
               
               
                 S211 
                 17.14 
                 1.72 
                 1.497 
                 81.6084 
                 28.25 
                 The Sixth Lens L26 
               
               
                 S212 
                 −75.90 
                 1.68 
               
               
                 S213 
                 −23.33 
                 7.17 
                 1.497 
                 81.6084 
                 62.52 
                 The Seventh Lens L27 
               
               
                 S214 
                 −14.70 
                 0.15 
               
               
                 S215 
                 20.89 
                 4.80 
                 1.497 
                 81.6084 
                 15.07 
                 The Eighth Lens L28 
               
               
                 S216 
                 −10.82 
                 1.19 
                 1.8467 
                 23.7848 
                 −12.76 
                 The Ninth Lens L29 
               
               
                 S217 
                 −2169.95 
                 3.29 
               
               
                 S218 
                 11.83 
                 4.54 
                 1.5168 
                 64.1673 
                 30.25 
                 The Tenth Lens L210 
               
               
                 S219 
                 42.76 
                 2.60 
               
               
                 S220 
                 ∞ 
                 0.84 
                 1.5168 
                 64.1673 
                   
                 Optical Filter OF2 
               
               
                 S221 
                 ∞ 
                 0.30 
               
               
                 S222 
                 ∞ 
                 0.50 
                 1.5168 
                 64.1673 
                   
                 Cover Glass CG2 
               
               
                 S223 
                 ∞ 
                 1.26 
               
               
                   
               
            
           
         
       
     
     The definition of aspheric surface sag z of each aspheric lens in table 4 is the same as that of in Table 1, and is not described here again. 
     In the second embodiment, the conic constant k and the aspheric coefficients A, B, C, D, E, F, G of each aspheric surface are shown in Table 5. 
     
       
         
           
               
               
               
               
               
               
             
               
                 TABLE 5 
               
               
                   
               
             
            
               
                 Surface 
                   
                 A 
                 B 
                 C 
                 D 
               
               
                 Number 
                 k 
                 E 
                 F 
                 G 
               
               
                   
               
               
                 S218 
                 0.64063 
                 −0.00025533841 
                 4.7168952e−006 
                 −1.6906538e−007 
                 2.1543293e−009 
               
               
                   
                   
                 −1.0706626e−011 
                 0 
                 0 
               
               
                 S219 
                 25.08218 
                 −0.00038550801 
                 1.3490884e−005 
                 −5.1745427e−007 
                 1.1831998e−008 
               
               
                   
                   
                  −1.751061e−010 
                 1.6330922e−012 
                 −6.9227179e−015 
               
               
                   
               
            
           
         
       
     
     Table 6 shows the parameters and condition values for conditions (1)-(6) in accordance with the second embodiment of the invention. It can be seen from Table 6 that the wide-angle lens assembly  2  of the second embodiment satisfies the conditions (1)-(6). 
     
       
         
           
               
               
               
               
               
               
               
             
               
                   
                 TABLE 6 
               
               
                   
                   
               
             
            
               
                   
                 θ 
                 89 degrees 
                   
                   
                   
                   
               
               
                   
                 TTL/f 
                 12.034 
                 TTL/θ 
                 0.742 
                 f 5 /f 
                 6.913 
               
               
                   
                   
               
            
           
         
       
     
     By the above arrangements of the lenses and stop ST 2 , the wide-angle lens assembly  2  of the second embodiment can meet the requirements of optical performance as seen in  FIGS. 4A-4F . 
     It can be seen from  FIG. 4A  that the field curvature of tangential direction and sagittal direction in the wide-angle lens assembly  2  of the second embodiment ranges from −0.02 mm to 0.08 mm. It can be seen from  FIG. 4B  that the distortion in the wide-angle lens assembly  2  of the second embodiment ranges from −7% to 0%. It can be seen from  FIGS. 4C-4E  that the root mean square spot radius is equal to 0.747 μm and geometrical spot radius is equal to 1.592 μm as image height is equal to 0.000 mm, the root mean square spot radius is equal to 1.414 μm and geometrical spot radius is equal to 3.569 μm as image height is equal to 3.965 mm, and the root mean square spot radius is equal to 3.428 μm and geometrical spot radius is equal to 13.198 μm as image height is equal to 7.930 mm for the lens assembly  2  of the second embodiment. It can be seen from  FIG. 4F  that the through focus modulation transfer function of tangential direction and sagittal direction in the lens assembly  2  of the second embodiment ranges from 0.0 to 0.78 as focus shift ranges from −0.05 mm to 0.05 mm. 
     It is obvious that the field curvature and the distortion of the wide-angle lens assembly  2  of the second embodiment can be corrected effectively, and the resolution and the depth of focus of the wide-angle lens assembly  2  of the second embodiment can meet the requirement. Therefore, the wide-angle lens assembly  2  of the second embodiment is capable of good optical performance. 
     Referring to  FIG. 5 ,  FIG. 5  is a lens layout and optical path diagram of a wide-angle lens assembly in accordance with a third embodiment of the invention. the wide-angle lens assembly  3  includes a first lens L 31 , a second lens L 32 , a third lens L 33 , a fourth lens L 34 , a fifth lens L 35 , a stop ST 3 , a sixth lens L 36 , a seventh lens L 37 , an eighth lens L 38 , a ninth lens L 39 , a tenth lens L 310 , an optical filter OF 3 , and a cover glass CG 3 , all of which are arranged in order from an object side to an image side along an optical axis OA 3 . In operation, an image of light rays from the object side is formed at an image plane IMA 3 . 
     According to paragraphs [0029]-[0044], wherein: the ninth lens L 39  is a plane-concave lens, wherein the image side surface S 317  is a plane surface; both of the object side surface S 320  and image side surface S 321  of the optical filter OF 3  are plane surfaces; and both of the object side surface S 322  and image side surface S 323  of the cover glass CG 3  are plane surfaces. 
     With the above design of the lenses and stop ST 3  and at least any one of the conditions (1)-(6) satisfied, the wide-angle lens assembly  3  can have an effective increased field of view, an effective increased resolution, an effective resisted environmental temperature change, an effective corrected aberration, and is capable of an effective corrected chromatic aberration. 
     Table 7 shows the optical specification of the wide-angle lens assembly  3  in  FIG. 5 . 
     
       
         
           
               
               
             
               
                 TABLE 7 
               
               
                   
               
             
            
               
                 Effective Focal Length = 5.41 mm 
                 F-number = 2.8 
               
               
                 Total Lens Length = 69.98 mm 
                 Field of View = 178.1 degrees 
               
            
           
           
               
            
               
                 Effective Focal Length of A Combination of The Third Lens and The Fourth Lens = −255.38 mm 
               
               
                 Effective Focal Length of A Combination of The Eighth Lens and The Ninth Lens = −124.71 mm 
               
               
                   
               
            
           
           
               
               
               
               
               
               
               
            
               
                   
                 Radius of 
                   
                   
                   
                 Effective 
                   
               
               
                 Surface 
                 Curvature 
                 Thickness 
                   
                   
                 Focal Length 
               
               
                 Number 
                 (mm) 
                 (mm) 
                 Nd 
                 Vd 
                 (mm) 
                 Remark 
               
               
                   
               
               
                 S31 
                 41.90 
                 2.91 
                 1.5935 
                 67.3266 
                 −30.62 
                 The First Lens L31 
               
               
                 S32 
                 12.37 
                 7.99 
               
               
                 S33 
                 58.38 
                 1.72 
                 1.5168 
                 64.2124 
                 −19.87 
                 The Second Lens L32 
               
               
                 S34 
                 8.66 
                 7.42 
               
               
                 S35 
                 −11.71 
                 6.92 
                 1.8467 
                 23.7848 
                 −18.03 
                 The Third Lens L33 
               
               
                 S36 
                 −62.59 
                 2.85 
                 1.8042 
                 46.5025 
                 26.91 
                 The Fourth Lens L34 
               
               
                 S37 
                 −16.45 
                 0.20 
               
               
                 S38 
                 52.25 
                 2.02 
                 1.8467 
                 23.7848 
                 43.16 
                 The Fifth Lens L35 
               
               
                 S39 
                 −122.08 
                 6.63 
               
               
                 S310 
                 ∞ 
                 0.29 
                   
                   
                   
                 Stop ST3 
               
               
                 S311 
                 16.48 
                 1.86 
                 1.4875 
                 70.4196 
                 28.01 
                 The Sixth Lens L36 
               
               
                 S312 
                 −77.74 
                 1.49 
               
               
                 S313 
                 −21.16 
                 7.33 
                 1.497 
                 81.6084 
                 70.03 
                 The Seventh Lens L37 
               
               
                 S314 
                 −14.69 
                 0.20 
               
               
                 S315 
                 22.76 
                 3.84 
                 1.497 
                 81.6084 
                 15.65 
                 The Eighth Lens L38 
               
               
                 S316 
                 −11.19 
                 1.03 
                 1.8467 
                 23.7848 
                 −13.13 
                 The Ninth Lens L39 
               
               
                 S317 
                 ∞ 
                 5.48 
               
               
                 S318 
                 11.54 
                 4.30 
                 1.5142 
                 64.1005 
                 28.77 
                 The Tenth Lens L310 
               
               
                 S319 
                 45.36 
                 2.60 
               
               
                 S320 
                 ∞ 
                 0.70 
                 1.5168 
                 64.1673 
                   
                 Optical Filter OF3 
               
               
                 S321 
                 ∞ 
                 0.30 
               
               
                 S322 
                 ∞ 
                 0.50 
                 1.5168 
                 64.1673 
                   
                 Cover Glass CG3 
               
               
                 S323 
                 ∞ 
                 1.41 
               
               
                   
               
            
           
         
       
     
     The definition of aspheric surface sag z of each aspheric lens in table 7 is the same as that of in Table 1, and is not described here again. 
     In the third embodiment, the conic constant k and the aspheric coefficients A, B, C, D, E, F, G of each aspheric surface are shown in Table 8. 
     
       
         
           
               
               
               
               
               
               
             
               
                 TABLE 8 
               
               
                   
               
             
            
               
                 Surface 
                   
                 A 
                 B 
                 C 
                 D 
               
               
                 Number 
                 k 
                 E 
                 F 
                 G 
               
               
                   
               
               
                 S318 
                 0.372693 
                 −0.0001845831 
                 4.1484162e−006 
                 −1.3600336e−007 
                  1.722083e−009 
               
               
                   
                   
                 −9.5514934e−012 
                 0 
                 0 
               
               
                 S319 
                 25.26336 
                 −0.0002430391 
                 1.1625706e−005 
                 −4.6073021e−007 
                 1.0781008e−008 
               
               
                   
                   
                  −1.622046e−010 
                 1.4491859e−012 
                 −5.8755947e−015 
               
               
                   
               
            
           
         
       
     
     Table 9 shows the parameters and condition values for conditions (1)-(6) in accordance with the third embodiment of the invention. It can be seen from Table 9 that the wide-angle lens assembly  3  of the third embodiment satisfies the conditions (1)-(6). 
     
       
         
           
               
               
               
               
               
               
               
             
               
                   
                 TABLE 9 
               
               
                   
                   
               
             
            
               
                   
                 θ 
                 89.05 degrees 
                   
                   
                   
                   
               
               
                   
                 TTL/f 
                 12.935 
                 TTL/θ 
                 0.786 
                 f 5 /f 
                 7.978 
               
               
                   
                   
               
            
           
         
       
     
     By the above arrangements of the lenses and stop ST 3 , the wide-angle lens assembly  3  of the third embodiment can meet the requirements of optical performance as seen in  FIGS. 6A-6F . 
     It can be seen from  FIG. 6A  that the field curvature of tangential direction and sagittal direction in the wide-angle lens assembly  3  of the third embodiment ranges from −0.05 mm to 0.05 mm. It can be seen from  FIG. 6B  that the distortion in the wide-angle lens assembly  3  of the third embodiment ranges from −6% to 0%. It can be seen from  FIGS. 6C-6E  that the root mean square spot radius is equal to 1.144 μm and geometrical spot radius is equal to 2.570 μm as image height is equal to 0.000 mm, the root mean square spot radius is equal to 1.396 μm and geometrical spot radius is equal to 3.661 μm as image height is equal to 3.965 mm, and the root mean square spot radius is equal to 5.516 μm and geometrical spot radius is equal to 19.388 μm as image height is equal to 7.930 mm for the lens assembly  3  of the third embodiment. It can be seen from  FIG. 6F  that the through focus modulation transfer function of tangential direction and sagittal direction in the lens assembly  3  of the third embodiment ranges from 0.0 to 0.75 as focus shift ranges from −0.05 mm to 0.05 mm. 
     It is obvious that the field curvature and the distortion of the wide-angle lens assembly  3  of the third embodiment can be corrected effectively, and the resolution and the depth of focus of the wide-angle lens assembly  3  of the third embodiment can meet the requirement. Therefore, the wide-angle lens assembly  3  of the third embodiment is capable of good optical performance. 
     While the invention has been described by way of example and in terms of the preferred embodiment(s), it is to be understood that the invention is not limited thereto. On the contrary, it is intended to cover various modifications and similar arrangements and procedures, and the scope of the appended claims therefore should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements and procedures.