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:
Sep. 08, 1987
Filed:
Sep. 18, 1985
Applicant:
Inventors:
Assignee:
Canon Kabushiki Kaisha, , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
354246 ;
Abstract
The present invention relates to a braking device for a focal plane shutter in a camera. In the early stage of a braking operation on a shutter curtain, a relatively weak braking force is applied, and in the closing stage of the braking operation, a strong braking force is applied to insure that without causing the shutter curtain to bounce or to be damaged by shock, the shutter curtain is stopped. The device is constructed from two brake members arranged so that in the early stage the first brake member takes action, and in the closing stage, the second brake member takes action to add a braking force to that of the first brake member.