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:
Aug. 04, 1981
Filed:
Jan. 23, 1980
Applicant:
Inventors:
Nobuo Tezuka, Tokyo, JP;
Teiji Hashimoto, Kawasaki, JP;
Mitio Senuma, Tokyo, JP;
Yutaka Iwata, Chichibu, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
354244 ;
Abstract
Rollers having attached thereto ribbons of a shutter screen of a focal plane shutter are arranged to have either another roller or a shutter screen take-up shaft fitted therein with a frictional force provided between them. The rollers are provided with an engaging part for engagement with an external member. The degree of parallelism between the slit forming ends of the front and rear screens of the shutter forming a slit for exposure is adjustable by operating the external member to rotate the rollers with a force greater than the frictional force.