Patent ID: 8861096

Claim:
An imaging lens 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, a surface closest to the image side in the first lens group is a second aspheric surface, and the first lens group comprising a first transparent plate positioned between the first aspheric surface and the 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, a surface closest to the image side in the second lens group is a fourth aspheric surface, and the second lens group comprises a second transparent plate positioned between the third aspheric surface and the fourth aspheric surface, wherein the imaging lens satisfies: −8<f 2 /f<−4, where f is an effective focal length (EFL) of the imaging lens, and f 2 is an EFL of the second lens group.