Patent ID: 7164545

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) 0.55≧ f 1 /f 2 ≧0.2 (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.