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:
Aug. 25, 2009
Filed:
Jul. 06, 2006
Hiroki Murata, Sunto-gun, JP;
Teruhiko Namiki, Mishima, JP;
Osamu Nagasaki, Numazu, JP;
Atsuhiko Yamaguchi, Izu, JP;
Tomohiro Nakamori, Yokohama, JP;
Takehiro Uchiyama, Sunto-gun, JP;
Kouji Yasukawa, Susono, JP;
Hiroki Murata, Sunto-gun, JP;
Teruhiko Namiki, Mishima, JP;
Osamu Nagasaki, Numazu, JP;
Atsuhiko Yamaguchi, Izu, JP;
Tomohiro Nakamori, Yokohama, JP;
Takehiro Uchiyama, Sunto-gun, JP;
Kouji Yasukawa, Susono, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A power supply device generates an output voltage by driving a piezoelectric transformer using a frequency signal. The power supply device includes a comparison unit configured to compare an output voltage and a voltage setting signal that sets the output voltage, and a voltage control oscillation unit configured to generate the frequency signal to drive the piezoelectric transformer based on comparison results of the comparison unit. The voltage control oscillation unit generates the frequency signal within a range between the resonant frequency and a spurious resonant frequency closest to the resonant frequency.