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:
Nov. 29, 1983
Filed:
Dec. 22, 1981
Applicant:
Inventor:
Michio Senuma, Tokyo, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
354234 ; 354246 ;
Abstract
In the disclosed focal plane shutter, desired travelling characteristics of shutter curtains are obtained by adjusting the distribution of magnetic flux density between the permanent magnet and the coil which constitute an electromagnetic drive source. Preferably, the flux density is arranged to be a maximum closer to the start position than the end position.