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:
Dec. 24, 1991
Filed:
Feb. 06, 1991
Nobuyoshi Hagiuda, Kawasaki, JP;
Hideki Matsui, Yokohama, JP;
Norikazu Yokonuma, Tokyo, JP;
Yoshikazu Iida, Chigasaki, JP;
Hiroshi Sakamoto, Kawasaki, JP;
Nikon Corporation, Tokyo, JP;
Abstract
An electronic flash apparatus uses a voltage-controlled switching device, such as an insulated gate bipolar transistor, for controlling the start and termination of flash emission from a flash discharge tube. A peak voltage of an oscillation generated in a resonant circuit, produced in response to a flash emission start command, is clamped by a clamping circuit and is used to turn on the voltage-controlled switching device. Another resonant circuit may be used for doubling the voltage between the anode and cathode of the flash discharge tube when the flash discharge tube is triggered.