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:
Jun. 15, 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:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
354435 ;
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 outputting by the photo-interruptor of a signal pulse corresponding to the speed of the shutter. A memory storing exposure data, such as a matrix memory, is accessible as a function of the speed signal and an exposure quantity that is a function of the brightness of the brightness of an object to be photographed. The accessed exposure data is modified as a function of an observed exposure quantity.