Patent ID: 9612419
Date: 2017-04-04
CPC Classifications: G02B,G03B

Claim:
1. A lens assembly comprising a first lens group, a stop and a second lens group, all of which are arranged in order from an object side to an image side along an optical axis, wherein: the first lens group consists of a first lens, wherein the first lens is with negative refractive power; the second lens group comprises a second lens, a third lens, a fourth lens and a fifth lens, all of which are arranged in order from the object side to the image side along the optical axis, wherein the second lens is with negative refractive power and comprises a concave surface facing the object side, the third lens is with positive refractive power, the fourth lens is with negative refractive power and the fifth lens is with positive refractive power; and the lens assembly satisfies: wherein f is an effective focal length of the lens assembly, f