Patent Number: 6,169,635

Title: Zoom lens system

Abstract: A zoom lens system includes a negative first lens group, an aperture stop, and a positive second lens group, arranged in this order from an object side. The first and second lens groups are movable along an optical axis for zooming, while the aperture stop, which is disposed between the lens groups, stays unmoved during zooming. The zoom lens system satisfies conditions (1), (2) and (3): and where f.sub.i is a focal length of the entire system when the total length of the entire system becomes shortest, f.sub.w is the shortest focal length of the entire system, f.sub.t is the longest focal length of the entire system, d.sub.i is air gap between the first lens group and the aperture stop when the total length is the shortest and f.sub.2 is a focal length of the second lens group.

Inventors: Ozaki; Hiroyasu (Tokyo, JP), Ito; Takayuki (Saitama-ken, JP)

Assignee: Asahi Kogaku Kogyo Kabushiki Kaisha

International Classification: G02B 15/177 (20060101); G02B 015/14 ()

Expiration Date: 01/02/2018