Patent ID: 7894141

Claim:
An imaging lens, comprising a first lens L 1 , an aperture stop S, a second lens L 2 , and a third lens L 3 , wherein said first lens L 1 , said aperture stop S, said second lens L 2 and said third lens L 3 are arranged in this sequence from an object side to an image side, said first lens L 1 comprises a meniscus lens having a positive refractive power, of which convex surface faces the object side, said second lens L 2 comprises a meniscus lens having a positive or negative refractive power, of which convex surface faces the image side, said third lens L 3 comprises a meniscus lens having a negative refractive power, of which convex surface faces the object side, both surfaces of said first lens L 1 are aspherical, both surfaces of said second lens L 2 are aspherical, and both surfaces of said third lens L 3 are aspherical, and the following conditions are satisfied: 0.90 <D/f< 1.20 (1) 0.20 <r 1 /f< 0.35 (2) 0.80 <f 1 /f< 1.00 (3) −9.00 <f 3 /f< 3.20 (4) 50.0<ν<60.0 (5) where, f: composite focal length of the imaging lens generated by said first lens L 1 , said second lens L 2 and said third lens L 3 ; D: distance from the object side surface of said first lens L 1 to an image formation surface; r 1 : radius of curvature of the object side surface of said first lens L 1 in the vicinity of an optical axis of the first lens; f 1 : focal length of said first lens L 1 ; f 3 : focal length of said third lens L 3 ; ν: Abbe number of said second lens L 2 .