Patent ID: 7167324

Claim:
An imaging lens system used for forming an image of an object on an image taking surface of a solid image sensor element, comprising: in order from an object side towards an image surface side, a diaphragm, a first lens which is a meniscus lens having positive power whose convex surface facing said object side, and a second lens which is a lens having a positive power whose convex surface facing said image surface side, wherein conditions expressed by each of following expressions (1)–(7) are to be satisfied; 1.25 ≧L/fl≧ 0.8 (1) 1 ≧f 1 /f 2 >0.55 (2) 1.8 ≧f 1 /fl≧ 1 (3) 4 ≧f 2 /fl≧ 1.5 (4) 1 ≧d 2 /d 1 ≧0.5 (5) 0.27 ≧d 1 /fl≧ 0.1 (6) 0.27 ≧d 3 /fl≧ 0.1 (7) where, L: entire length of said lens system fl: focal distance of entire lens system f 1 : focal distance of said first lens f 2 : focal distance of said second lens d 1 : center thickness of said first lens d 2 : distance between said first lens and second lens on an optical axis d 3 : center thickness of said second lens.