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:
Apr. 27, 1976
Filed:
Nov. 12, 1974
Applicant:
Inventor:
Kunio Matsumoto, Ageo, JA;
Assignee:
Copal Company Limited, Tokyo, JA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
354 29 ; 354 38 ; 354 43 ; 354 51 ; 354 / ; 354230 ;
Abstract
An electric shutter comprising a diaphragm-aperture controlling cam plate which is started by shutter release operation, an electro-magnet capable of stopping the movement of said cam plate, and an RC delay circuit capable of controlling the energizing time of said electromagnet, in order (1) that the diaphragm aperture can be automatically set according to brightness of the object to be photographed and (2) that exposure can be carried out at a proper shutter speed taking the setting of the diaphragm aperture into consideration.