Patent ID: 7605990

Claim:
An lens system comprising a first lens and a second lens arranged in turn from an object side to an image side, whereby, the first lens includes a first surface facing toward the object side and a second surface facing toward the image side, the second lens includes a third surface facing toward the object side and a fourth surface facing toward the image side, the first, second, third and fourth surface are all aspherical, and the lens system satisfies the following conditions: 0.08≦ D 2/ D≦ 0.14 4≦ h 2/ z 2≦12 wherein, D 2 is the distance along an optical axis of the lens system from the second surface of the first lens to the third surface of the second lens, D is the distance along the optical axis of the lens system from the first surface of the first lens to the fourth surface of the second lens, h 2 is the distance from the optical axis of the lens system to the outermost optically effective portion of the second lens surface of the first lens, and z 2 is the distance along the optical axis of the lens system from the vertex of the second surface of the first lens to the point of the optical axis from where h 2 is measured.