Patent ID: 8098443

Claim:
A miniature zoom lens system, comprising, arranged sequentially along an optical axis from an object side to an imaging plane: a first lens group having a negative refractive power and fixed in position; a second lens group having a positive refractive power, wherein an aperture stop is provided on a side of the second lens group that faces the first lens group and is movable with the second lens group; and a third lens group having a positive refractive power; wherein the second lens group and the third lens group are relatively movable along the optical axis at least between a wide-angle position and a telephoto position, and the miniature zoom lens system satisfies conditions of: 11.5 <Dw 1-2/ Dw 2-3<18.5; and Dt 1-2/ Dt 2-3<0.2; where: Dw 1 - 2 is an air spacing between the first lens group and the second lens group when the second lens group and the third lens group are in the wide-angle position; Dw 2 - 3 is an air spacing between the second lens group and the third lens group when the second lens group and the third lens group are in the wide-angle position; Dt 1 - 2 is an air spacing between the first lens group and the second lens group when the second lens group and the third lens group are in the telephoto position; and Dt 2 - 3 is an air spacing between the second lens group and the third lens group when the second lens group and the third lens group are in the telephoto position.