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:
Jan. 19, 1993
Filed:
Jun. 24, 1991
Applicant:
Inventors:
Shigeru Tagami, Chiba, JP;
Kazuo Akimoto, Chiba, JP;
Kanji Ito, Chiba, JP;
Katsuhiko Matsushita, Chiba, JP;
Assignee:
Seikosha Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
354435 ; 354437 ; 354439 ;
Abstract
A camera shutter system has a motor driven sector for opening and closing a shutter opening. A photo-interruptor is positioned to intercept a light beam, to effect the generation of a photo-interruptor signal. A timer has a counter that is set to a first count in response to the photo-interruptor signal, and is reset when a given count is reached. A shutter malfunction signal is generated when the level of the photo-interruptor signal has not changed by the time the given count is reached.