Patent ID: 7643220
Filing Date: 2010-01-05
Classification: G02B

Abstract:
1. A zoom lens, comprising: a first lens group, having a negative refractive power, and comprising a first lens, a second lens, and a third lens arranged from an object side to an image side in sequence, wherein the first lens is a convex-concave lens having a convex surface facing the object side, the second lens is a concave lens having a concave surface facing the image side, and the third lens is a convex lens having a convex surface facing the object side; and a second lens group, having a positive refractive power and disposed between the first lens group and the image side, and the second lens group comprising a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged from the object side to the image side in sequence, wherein refractive powers of the fourth lens, fifth lens, sixth lens, and seventh lens are positive, positive, negative, and positive sequentially, and the first lens group and the second lens group are capable of moving between the object side and the image side; wherein the first, second, third, fourth, fifth, sixth, and seventh lenses are all spherical lenses.