Patent ID: 7372643
Filing Date: 2008-05-13
Classification: G02B

Abstract:
1. An image-forming lens set comprising an aperture stop, a first lens with positive power, a second lens with negative power and a third lens, which are arranged along an optical axis from an object side toward an image side in order; wherein the first lens has two opposite surfaces including a convex surface facing the object side, and at least one of the two opposite surfaces is a non-spherical surface; wherein the second lens is a convex-concave lens having two opposite surfaces including a concave surface facing the object side, and at least one of the two opposite surfaces of the second lens is a non-spherical surface; wherein the third lens has negative refractive power becoming greater from a center to a periphery of positive refractive power; the third lens has two non-spherical opposite surfaces including a convex surface facing the object side; and wherein at least one of the first, second and third lenses is coated with a layer of optical film for filtering light.