Patent ID: 7684129

Claim:
An imaging lens system, in order from the object side to the image side, comprising a first lens with positive refractive power, a second lens with positive refractive power, an infrared filter and a glass cover, the imaging lens system satisfying the following formulas: 1.2≦TTL/f≦2.0, where image TTL is the distance along an optical axis of the imaging lens system from the object-side lens surface of the first lens to an imaging plane, f is the focal length of the whole image lens system; the infrared filter and the glass cover satisfying the following parameters: Lens surfaces D Nd Vd S5 0.145 1.5168 64.167 S6 0.2 S7 0.35 1.5168 64.167 D: distance between two adjacent lens surfaces along the optical axis of the imaging lens system; Nd: refractive index of lens with respect to the d light; and Vd: Abbe constant; S 5 : object surface of the infrared filter; S 6 : image surface of the infrared filter; S 7 : object surface of the glass cover.