Patent ID: 7158313
Filing Date: 2007-01-02
Classification: G02B

Abstract:
1. A zoom lens, comprising: a first lens group with positive power, fixed at a forefront of the zoom lens to face an object side for receiving light; a second lens group with negative power, movably positioned behind the first lens group for zooming, and comprising a first lens, a second lens with negative power, a third lens with positive power, wherein the first lens is a biconcave lens, at least one of the lenses of the second lens group comprising one aspherical lens; a third lens group with positive power, fixedly positioned behind the second lens group; a fourth lens group with positive power, movably positioned behind the third lens group, and comprising at least one aspherical lens; and a fifth lens group with positive power, movably positioned behind the fourth lens group for focusing, wherein when the zoom lens is zoomed from a wide status to a telephoto status, an interval between the first lens group and the second lens group is increased, an interval between the third lens group and the fourth lens group is decreased.