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. 03, 1983
Filed:
Nov. 07, 1980
Yoshiyuki Takematsu, Tokyo, JP;
Fuji Koeki Corporation, Tokyo, JP;
Abstract
An electronic flash device having a battery, means for converting the battery voltage to alternating current voltage, means for rectifying the alternating current voltage to direct current voltage, a main storage capacitor charged by the direct current voltage, a flash tube in parallel with the storage capacitor, a trigger circuit for firing the flash tube and a control circuit for stopping the flash operation of the flash tube when a predetermined amount of light has been reflected from an object to be photographed. The control circuit is actuated by a light measuring circuit which senses the reflected light. A switch element connects the light measuring circuit to the battery during activation of the flash tube.