Patent ID: 7206144
Filing Date: 2007-04-17
Classification: G02B

Abstract:
1. 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): where, f represents the total focal distance of the total imaging lens system; f 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): where, f represents the focal distance of the total lens system; d d