Patent ID: 7385770

Claim:
An imaging lens system, comprising, in order from an object side to an imaging surface side: a first lens having a main positive power with its convex surface facing the object side; a second lens in a meniscus shape with its concave surface facing the object side; and a third lens functioning as a correction lens, wherein a diaphragm is provided between said first lens and said second lens; and said imaging lens system satisfies each of following conditional expressions (1), (2): 0.25 <r 1 /f <0.50 (1) −0.27 <r 3 /f <−0.19 (2) where, r 1 : a radius of center curvature of a surface (first face) of said first lens on the object sides, r 3 : a radius of center curvature of a surface (first face) of said second lens on the object side, and f: a focal distance of an entire lens system.