Patent ID: 8218244

Claim:
A miniature zoom lens, comprising: a first lens group with negative refractive power fixed at a predetermined position; a second lens group with positive refractive power being movable along an optical axis of the zoom lens in accordance with the change of the magnification of the zoom lens; and a third lens group with positive refractive power being movable along the optical axis in order to keep an image plane generated by the zoom lens to project accurately onto an image sensor; wherein the first, the second and the third lens groups are arranged along the optical axis and from an object side of the zoom lens to an image side of the zoom lens in sequence, and the first lens group and the second lens group conform to the following conditions: condition ⁢ ⁢ ( 1 ) ⁢ : ⁢ ⁢ 1.2 < F 2 F W · F T < 1.5 ; and condition ⁢ ⁢ ( 2 ) ⁢ : ⁢ ⁢ 1.1 ≤  F ⁢ ⁢ 1 F ⁢ ⁢ 2  ≤ 1.25 ; wherein F1 is the focal length of the first lens group, F2 is the focal length of the second lens group, F W is the total focal length at wide-configuration of the zoom lens, and F T is the total focal length at tele-configuration of the zoom lens.