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:
Mar. 20, 2001
Filed:
Sep. 08, 1999
Kazuyuki Iwasa, Hino, JP;
Olympus Optical Co., Ltd., , JP;
Abstract
A lens barrel has a photographing lens, first and second cam frames, drive systems, respectively driving the first and second cam frames, and a group frame intervening between the drive systems. The advancing and retreating of the second cam are determined by the group frame driven by the first cam frame. When the first cam is moved in the direction of an optical axis of the lens while rotating, the group frame moves rectilinearly along the optical axis with a cam follower engaging with a cam groove. The second cam rotates together with the first cam in the same direction and is largely moved in a slanting direction by the cam follower engaging with the cam groove of the group frame. Thus, the advancing and retreating of a plurality of advanceable and retreatable frame members are increased. Consequently, the local length of the lens barrel is increased.