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:
Apr. 09, 1985
Filed:
Aug. 24, 1983
Yoshiyuki Takematsu, Tokyo, JP;
Fuji Koeki Kabushiki Kaisha, Tokyo, JP;
Abstract
An improved photographic flash device of the type in which a photometric circuit exposed to light reflected from a subject being photographed generates a photometric signal which controls the amount of light emitted by the flash discharge tube of the device. A synchronizing switch closed by opening the shutter of the camera with which the device is employed activates a starting circuit to generate a starting signal, which in turn starts a timer powered by the low tension circuit of a DC--DC converter utilized in the flash device. The timer applies a constant voltage to the photometric circuit for a predetermined period of time. Both the starting circuit and timer are capable of reduction to integrated circuit form.