Patent ID: 7295386
Filing Date: 2007-11-13
Classification: G02B

Abstract:
1. An imaging lens comprising: in order from an object side of the imaging lens, a first lens having a convex surface on the object side and having a positive power; a second lens having a concave surface on the object side and having a negative power; a third lens having a positive power; and a fourth lens having a convex surface on the object side near a paraxial axis and having a meniscus shape, wherein the imaging lens satisfies conditional expressions (1) to (5): wherein f1 designates a focal length of the first lens; f designates a total focal length; n1 designates a refractive index of the first lens at the d-line; ν1 designates an Abbe number of the first lens at the d-line; f2 designates a focal length of the second lens; and f3 designates a focal length of the third lens.