Patent ID: 7388721
Filing Date: 2008-06-17
Classification: G02B

Abstract:
1. An imaging lens comprising a first lens, a second lens, and a third lens arranged in sequence from an object side, wherein the first lens is a meniscus lens having a positive power, whose convex surface faces the object side; the second lens is a meniscus lens having a positive or negative power, whose concave surface faces the object side; the third lens is a lens having a positive power; and a shape of at least one of the lens surfaces of the first, second, and third lenses is determined by an aspherical shape in which an inflection point does not appear within an effective lens surface region thereof, and wherein the following two conditions are satisfied when a curvature of the lens surface of the third lens on the object side is Ra, a radius of curvature of the lens surface thereof on the image side is Rb, a total focal distance of the imaging lens is f and a focal distance of the first lens is f1: