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:
Mar. 09, 1982
Filed:
Feb. 05, 1981
Toshihide Miyake, Kashihara, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
An electronic shutter control circuit comprises a photo-conductive material producing a signal to be applied to the first transistor, a second transistor having a base connected to its collector, the second transistor being serially connected to the first transistor, a third having a base transistor connected to the collector of the first transistor having a base, a fourth transistor connected to its collector, the fourth transistor being serially coupled to the third transistor, a current supplier circuit connected to the fourth transistor, a capacitor serially coupled to the third transistor, and a comparison circuit connected to the capacitor for detecting a charge amount condensed by the capacitor and for providing shutter operation signals used for operation of a shutter mechanism.