Patent ID: 8625210
Filing Date: 2014-01-07
Classification: G02B

Abstract:
1. A micro-lens module, comprising: a first lens group disposed between an object side and an image side, having a positive refractive power, and comprising a first lens, a first transparent flat lens and a second lens arranged in sequence from the object side to the image side, wherein the second lens is closest to the image side in the first lens group, and a surface of the second lens facing the image side is an aspheric surface; and a second lens group disposed between the first lens group and the image side, having a negative refractive power, and comprising a third lens, a second transparent flat lens and a fourth lens arranged in sequence from the object side to the image side, wherein the first lens group is composed of a first complex lens, the first complex lens comprises a plurality of lenses adhered to each other, and a refractive index of at least one lens in the lenses is different from refractive indexes of the other lenses, wherein the first lens is a plano-convex lens, a convex surface of the first lens faces to the object side, and a plano-surface of the first lens faces to the image side, and the second lens is a plano-convex lens, a plano-surface of the second lens faces to the object side, and a convex surface of the second lens faces to the image side, wherein the third lens is a plano-concave lens, a concave surface of the third lens faces to the object side, and a plano-surface of the third lens faces to the image side, and the fourth lens is a plano-convex lens, a plano-surface of the fourth lens faces to the object side, and a convex surface of the fourth lens faces to the image side.