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. 23, 1999
Filed:
Sep. 25, 1996
Hiroaki Miyazaki, Kanagawa, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
A movement detection and control device has a lens frame holding a lens. The lens frame is movable in a direction of an optical axis of the lens. A revolving cam moves the lens frame in the direction of the optical axis. A driving source drives the cam. A pattern-rotating member having patterns for pulse generation, is rotated by the driving source. A detector detects the patterns, and generates pulse signals in response to driving by the driving source. A control circuit counts the pulse signals, and drives the driving source in a controlled manner to move the lens frame by a predetermined amount. The revolving cam is provided with a light-sealing member for intercepting the detector from generating pulse signals in an area where the cam starts or finishes its movement.