Patent ID: 8922913

Claim:
A lens system, comprising: a first substrate having an outside surface; a first lens having a concave aspheric surface and a focal length F1; a second lens having a convex aspheric surface facing the first lens and a focal length F2; and a third lens having a concave aspheric surface and a focal length F3; wherein the lens system satisfies the following conditions: 0.2 <EFFL/TTL< 0.5; −0.75 <EFFL/F 1<−0.35; 1 <EFFL/F 2<1.4; −0.65 <EFFL/F 3<−0.15; V 2 >V 3 and V 3<35; wherein: (i) EFFL is an effective focal lens of the lens system; (ii) TTL is a distance from the outside surface of the first substrate to an image plane; and (iii) V2 is an Abbe number of the second lens, and V3 is an Abbe number of the third lens.