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. 02, 1981
Filed:
Jun. 19, 1979
Applicant:
Inventors:
Yuzuru Takazawa, Yotsukaido, JP;
Shinji Nagaoka, Yotsukaido, JP;
Assignee:
Seiko Koki Kabushiki Kaisha, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
354 21 ; 354 51 ;
Abstract
In an electric shutter control circuit capable of properly controlling exposure in response to information concerning exposure parameters, such as subject brightness, the trigger level of the switching circuit controlling the exposure operation is automatically set in proportion to the sensitivity of the film being used by using a specific conductive part provided on the outer surface of the film holder so that the exposure is properly controlled according to the sensitivity of the film loaded in the camera.