Patent ID: 9523840
Filing Date: 2016-12-20
CPC Classification: G02B

Claim Text:
1. A lens assembly comprising a first lens, a second lens, a stop, a third lens and a fourth 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 biconcave lens with negative refractive power and comprises an object side surface and an image side surface, wherein at least one of the object side surface and the image side surface is an aspheric surface; the second lens is a biconvex lens with positive refractive power; the third lens is a biconvex lens with positive refractive power and comprises an object side surface and an image side surface, wherein at least one of the object side surface and the image side surface is an aspheric surface; the fourth lens is with negative refractive power and comprises an object side surface and an image side surface, wherein at least one of the object side surface and the image side surface is an aspheric surface; and the lens assembly satisfies:  wherein f