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. 13, 1990
Filed:
Dec. 09, 1988
Toshiyuki Kumakura, Kanagawa, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
This invention concerns with an electronic flash unit in which, as two capacitors of large and small capacitances are charged, even when a trigger operation is actuated before the capacitor of large capacitance is fully charged, it is made possible with the help of the charge from the capacitor of small capacitance to fire the flash tube. Particularly in application of the invention to the above-described type of electronic flash unit, as the battery for use in charging the capacitors also serves to drive another load for a time which can fall in coincidence with the period of charging the capacitors, when the driving of the load is started, the charging of the capacitor of large capacitance is inhibited while the charging of the capacitor of small capacitance is permitted to go on, thereby it being made possible to carry out the driving of the load with high reliability so that the correct flash exposure is made while still maintaining the quickness of snap shots.