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:
May. 13, 2003
Filed:
Oct. 29, 2001
Katsuyuki Ishikawa, Tokyo, JP;
Takeshi Fujimura, Tokyo, JP;
Toshiyuki Terada, Tokyo, JP;
Tatsuya Goto, Sagamihara, JP;
Other;
Abstract
In an electronic flash device, a driving circuit ( ) drives a piezoelectric transformer ( ) in response to an oscillation signal of a predetermined frequency, which is output from an oscillation circuit ( ). A switch ( ) is provided in series in a line that connects the output of the piezoelectric transformer ( ) and a capacitor ( ). When the switch ( ) is ON, the output voltage from the piezoelectric transformer ( ) is rectified by a rectifier circuit, and charges the discharge capacitor ( ) as electric energy for discharging a discharge tube ( ). When the switch ( ) is turned off, and the output voltage from the piezoelectric transformer ( ) is applied to the discharge tube ( ), the discharge tube ( ) emits flash light by the electric energy stored in the discharge capacitor ( ) in response to that applied voltage as a trigger.