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:
Jul. 17, 1990
Filed:
Dec. 12, 1988
Applicant:
Inventor:
Kazuo Ikawa, Kanagawa, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H05B / ;
U.S. Cl.
CPC ...
3152 / ; 3152 / ; 315D / ; 315D / ; 315291 ;
Abstract
In the oscillating booster circuit of an electronic flash device for a camera arranged to boost the output of a DC low voltage source by a blocking oscillator circuit and to make it into a DC high voltage through a high voltage rectifier diode before a main capacitor of the flash device is charged therewith, a booster circuit operation display arrangement is operated solely by the spike voltage of the booster circuit to stably display the operating state of the booster circuit.