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:
Jun. 14, 1988
Filed:
Nov. 18, 1986
Takanori Kodaira, Tokyo, JP;
Akira Egawa, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A control signal generator for a camera arranged to control the aperture of a stop by the opening degree of at least two shutter blades; to detect the opening degree of the shutter by detecting, with a photo interrupter, openings provided in one of the shutter blades; and to form a control signal based on to the opening degree of the shutter thus detected. When the shutter is closed, a shutter blade other than the blade having the openings confronts the light emitting and receiving elements of the photo interrupter to block an optical path thereby. When the shutter begins to open, the optical path is opened and the photo interrupter generates a signal indicating commencement of the opening action of the shutter.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile