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:
May. 16, 1978
Filed:
Sep. 28, 1976
Nobuhiko Shinoda, Tokyo, JA;
Tadashi Ito, Yokohama, JA;
Soichi Nakamoto, Machida, JA;
Fumio Ito, Yokohama, JA;
Canon Kabushiki Kaisha, Tokyo, JA;
Abstract
In the camera exposure control apparatus disclosed, a light sensor produces a first analog signal corresponding to the brightness of an object to be photographed. This signal is compared to a gradually varying second analog signal. The variation of the second analog signal is discontinued when the first and second signals reach a predetermined relationship and the second analog signal is stored. As the aperture of the camera's diaphragm is varied, the stored signal is compared with an analog signal corresponding to the diaphragm opening to produce a control signal that inhibits aperture variation when the latter compared signals reach a predetermined relationship.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile