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. 11, 1983
Filed:
Aug. 21, 1981
Applicant:
Inventors:
Syozo Yoshida, Machida, JP;
Syuichiro Saito, Yokohama, JP;
Assignee:
Canon Kabushiki Kaisha, , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
354234 ;
Abstract
An electromagnetically driven shutter for use in a photographic camera has blades driven by an electromagnetic drive source to move in vertical directions. The electrical power supply control means for the electromagnetic drive source is provided with means for detecting the photographic posture of the camera, whereby the output torque of the electromagnetic drive source is changed as the camera posture changes. This is done in order to insure that the speed of movement of the shutter blades is maintained constant regardless of whether or not the camera is positioned normally, or upside down.