Patent ID: 7206144

Claim:
An imaging lens system, comprising: a first lens having a meniscus profile with a convex surface facing an object side an aperture diaphragm; and a second lens having a meniscus profile with a convex surface facing an image side wherein the first lens, the aperture diaphragm, and the second lens are arranged in this order from the object side; and the imaging lens satisfies conditional expressions (1), (2), and (3): 0.2< f/f 1<1.0; (1) 1.05< L/f< 1.38; and (2) n ( ave )>1.7, (3) where, f represents the total focal distance of the total imaging lens system; f 1 represents a focal distance of the first lens; and L represents a distance on the optical axis from the surface on the object side of the first lens to an image plane; and n(ave) represents an average value of refractive indexes at d-lines of the first and second lenses, and further satisfying conditional expressions (4) and (5): 0.05≦ d 1/ f≦ 0.09; and (4) 0.10≦ d 2/ f≦ 0.18, (5) where, f represents the focal distance of the total lens system; d 1 represents a distance from a surface on the image side of the first lens to the aperture diaphragm; and d 2 represents a distance from the aperture diaphragm to a surface on the object side of the second lens.