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:
Nov. 14, 2000
Filed:
May. 25, 1999
Applicant:
Inventor:
Yoshiro Ichihara, Yokohama, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B / ;
U.S. Cl.
CPC ...
3152 / ; 396205 ; 315219 ;
Abstract
In a power supply device for a flash apparatus having the primary winding side of a transformer and an oscillation-controlling switching element connected in parallel to a power supply and the secondary winding side of the transformer connected to a main capacitor through a rectifier element, a current-to-voltage conversion circuit is arranged to output a voltage signal according to a current flowing from the secondary winding side of the transformer to the main capacitor, and the main capacitor is charged by on-off controlling the switching element according to the voltage signal outputted from the current-to-voltage conversion circuit.