Patent ID: 7295383

Claim:
An imaging lens used for forming an image of an object on an image taking surface of a solid-state image sensor element, comprising: in order from an object side towards an image surface side, a first lens which is a meniscus lens having a positive power whose convex surface faces the object side, a diaphragm, a second lens which is a meniscus lens having a positive power whose convex surface faces the image surface side, and a third lens which is a biconcave lens having a negative power, wherein conditions expressed by each of following expressions (1)–(4) are to be satisfied; 1.3 ≧L/fl≧ 1 (1) 0.8 ≧f 1 /fl≧ 0.6 (2) 0.12 ≧f 1 /f 2 ≧0 (3) −0.1 ≧f 1 /f 3 ≧−0.25 (4) where, L: entire length of the lens system (distance from the surface of the object side of the first lens to the image taking surface [air reduced length]) fl: focal distance of the entire lens system f 1 : focal distance of the first lens f 2 : focal distance of the second lens f 3 : focal distance of the third lens.