Patent ID: 7742242
Filing Date: 2010-06-22
Classification: G02B

Abstract:
1. A lens system comprising, in order from the object side: a positive refractive power first lens; a positive refractive power second lens; and a negative refractive power third lens, wherein the lens system satisfies the following conditions: wherein, G 1 R 1 is the radius of curvature of a surface of the first lens facing the object side of the lens system, G 1 R 2 is the radius of curvature of the surface of the first lens facing the image side of the lens system, F is a focal length of the lens system, F 1 is a focal length of the first lens, G 3 R 2 is the radius of curvature of a surface of the third lens facing the image side of the lens system, D 3 is the effective lens radius of the third lens, and h is the distance from the optical axis to a point on the image-side surface of the third lens farthest from the first lens.