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:
Jul. 06, 1982
Filed:
May. 28, 1980
Applicant:
Inventors:
Syozo Yoshida, Machida, JP;
Yoichi Tosaka, Shakujii, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
354234 ;
Abstract
In the disclosed electromagnetically driven shutter, a leading shutter member and a trailing shutter member are driven by respective electromagnetic drive sources through an exposure operation and a return operation. Selector switches supply drive current from a battery to electromagnetic coils of the drive sources and control the direction of the drive current. After an exposure operation, a relay sets the switches for a return operation and resets the switches for exposure. Preferably, the relay is controlled by signals delayed by different delay times from the termination of the exposure operation so as to set the switches correctly.