Patent ID: 7911712
Filing Date: 2011-03-22
Classification: G02B

Abstract:
1. An imaging lens comprising: a first lens that has a negative power and includes a concave surface facing an image side; a second lens having a positive power; a stop; a third negative lens that is a biconcave lens; a fourth lens having a positive power; and a fifth lens that has a positive power and includes a convex surface facing the image side, wherein the first to fifth lenses are arranged in this order from the object side, and the imaging lens satisfies the following conditional expressions: where f denotes a focal length of an entire lens system, D 1 denotes a thickness of a center of the first lens, D 4 denotes a distance from an image-side surface of the second lens to the stop on an optical axis, and D 5 denotes a distance from the stop to an object-side surface of the third lens on the optical axis.