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:
Jun. 24, 2003
Filed:
Jun. 07, 2001
Applicant:
Inventors:
Yukio Odaka, Kanagawa, JP;
Shoji Ichimasa, Kanagawa, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03B 1/505 ;
U.S. Cl.
CPC ...
G03B 1/505 ;
Abstract
The present invention provides an electronic flash device, and in particular, an electronic flash device including forward and flyback type booster circuits. The two booster circuits are appropriately switched depending on the charged state of a capacitor of the electronic flash device or the operative state of the camera, thereby achieving proper charging time and charging efficiency.