Patent ID: 7586694

Claim:
A lens assembly, in an order from an object side toward an image side along an optical axis thereof: a first lens with positive refractive power having two surfaces, at least one of said two surfaces being a spherical surface; and a second lens having two aspheric surfaces; and said lens assembly satisfying the following conditions: 0<|f 1 /f 2 |<2 and 0<|f 2 /f|<7, wherein f is an effective focal length of the lens assembly, f 1 is an effective focal length of the first lens, and f 2 is an effective focal length of the second lens, wherein said first lens is a meniscus-shaped converging lens, the two surfaces of said first lens include a convex surface facing the object side and a concave surface facing the image side, wherein said second lens is a wave-shaped converging lens having positive refractive power, one of the two aspheric surfaces of said second lens has a centered convex portion facing the object side, and the other of the two aspheric surface has a centered concave portion facing the image side.