The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 09, 2002
Filed:
Mar. 23, 2000
Takashi Enomoto, Chiba, JP;
Hiroshi Nomura, Saitama, JP;
Takayuki Ito, Saitama, JP;
Shinichiro Ishii, Saitama, JP;
Asahi Kogaku Kogyo Kabushiki Kaisha, Toyko, JP;
Abstract
A zoom lens system includes a plurality of lens groups being relatively moveable in order to vary the focal length, and at least one lens group is arranged to be a switching lens group which includes two or more sub-lens groups, and in which one sub-lens group is made moveable, along the optical axis, with respect to the other sub-lens group. In the first focal-length range of the zooming range of the zoom lens system, the moveable sub-lens group and the other sub-lens group maintain the first distance; and in the second focal-length range which covers the first focal-length range and a range different therefrom, the moveable sub-lens group and the other sub-lens group maintain the second distance which is different from the first one.