Patent ID: 8842381

Claim:
A micro-lens module, adapted for an image processing device, the micro-lens module comprising: a first lens group disposed between an object side and an image side, wherein a surface closest to the object side in the first lens group is a first aspheric surface, and a surface closest to the image side in the first lens group is a second aspheric surface; and a second lens group disposed between the first lens group and the image side, wherein a surface closest to the first lens group in the second lens group is a third aspheric surface, and a surface closest to the image side in the second lens group is a fourth aspheric surface, wherein an overall length of the micro-lens module is L, an effective focal length (EFL) of the micro-lens module is f, an EFL of the second lens group is f 2 , and the micro-lens module satisfies following conditions: 1.5>L/f>0.6, and −7>f 2 /f>−14, and a radius of curvature of the first aspheric surface is r 1 , a radius of curvature of the second aspheric surface is r 2 , a radius of curvature of the third aspheric surface is r 3 , a radius of curvature of the fourth aspheric surface is r 4 , and the micro-lens module satisfies following conditions: r 1 >0, r 2 >0, r 3 >0, and r 4 >0.