Patent ID: 7619835
Filing Date: 2009-11-17
Classification: G02B

Abstract:
1. An image-forming lens set comprising a first lens with positive power, a second lens with negative power, an aperture stop, and a third lens with positive power, 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 concave surface facing the object side and a convex surface facing the image 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 non-spherical opposite surfaces including a concave surface facing the image side; wherein the third lens has two non-spherical opposite convex surfaces facing the object side and image side respectively; wherein at least one of the first, second and third lenses is coated with a layer of optical film for filtering light; wherein Equation 1 is satisfied as follows: wherein Equation 3 is satisfied as follows: Equation 5 is satisfied as follows: