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:
Nov. 05, 1985
Filed:
Nov. 16, 1984
Kohichi Nishi, Yokohama, JP;
Akira Takahashi, Kawasaki, JP;
Ricoh Company, Ltd., , JP;
Abstract
An automatic exposure control circuit of a photographing camera having a shutter blade associated with an electromagnet driven by a driving circuit is disclosed, which is featured by having a film sensitivity information detector for detecting the film sensitivity electrically to provide an output signal, means responsive to the output signal for changing a reference voltage to be applied to the driving circuit and a .gamma. value correcting means for correcting the reference voltage according to the .gamma. value of a light receiving element of the camera.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile