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:
Oct. 13, 1981
Filed:
Apr. 23, 1980
Applicant:
Inventor:
Tadashi Nakagawa, Shikawatashi, JP;
Assignee:
Seiko Koki Kabushiki Kaisha, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
354246 ;
Abstract
In a focal plane shutter for a single lens reflex camera having, on the side of the shutter aperture, two blade groups each consisting of a plurality of separate blades adapted to operate sequentially in exposure operation, a shutter blade device includes said two blade groups having at least some of blades formed of thin synthetic resin plates. A shielding member is provided between a reflex mirror and said blade groups and adapted to retract from an aperture shielding position during the exposure operation of said two blade groups and return to an aperture shielding position before and after the exposure operation.