Patent ID: 9046639
Filing Date: 2015-06-02
Classification: G02B

Abstract:
1. A slim lens assembly comprising a first lens, a second lens, a third lens, a fourth lens and a fifth lens, all of which are arranged in sequence from an object side to an image side along an optical axis, wherein: the first lens is a convex-concave lens with negative refractive power and comprises a convex surface facing the object side and a concave surface facing the image side; the second lens is with positive refractive power; the third lens is a biconcave lens with negative refractive power; the fourth lens is a biconvex lens with positive refractive power; the fifth lens is a convex-concave lens with negative refractive power and comprises a convex surface facing the object side and a concave surface facing the image side; and the slim lens assembly satisfies: wherein BFL is a back focal length of the slim lens assembly, and TT is a distance from the convex surface of the first lens to an image plane along the optical axis.