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:
Jul. 19, 1983
Filed:
Jun. 23, 1981
Yoshiyuki Takematsu, Tokyo, JP;
Fuji Koeki Kabushiki Kaisha, Tokyo, JP;
Abstract
A photographic flash control device for enabling the firing of a flash light when the luminance level of an object to be photographed is less than a predetermined level and for inhibiting the firing of the flash light when the luminance of an object to be photographed is brighter than a predetermined level. A DC-DC converter generates an oscillating signal for charging a main discharge capacitor. A photoconductive device inhibits the generation of the oscillating DC signal when the luminance level of the object to be photographed exceeds a predetermined level. If the main discharge capacitor is charged to a predetermined firing level, firing of the flash light by a triggering circuit will be inhibited if a sudden change in illumination causes the luminance of the object to be photographed to exceed the level where a flash light is necessary.