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. 16, 2009
Filed:
Jan. 20, 2006
Osamu Nagasaki, Numazu, JP;
Atsuhiko Yamaguchi, Izu, JP;
Tomohiro Nakamori, Yokohama, JP;
Takehiro Uchiyama, Shizuoka-ken, JP;
Kouji Yasukawa, Susono, JP;
Teruhiko Namiki, Mishima, JP;
Hiroki Murata, Shizuoka-ken, JP;
Osamu Nagasaki, Numazu, JP;
Atsuhiko Yamaguchi, Izu, JP;
Tomohiro Nakamori, Yokohama, JP;
Takehiro Uchiyama, Shizuoka-ken, JP;
Kouji Yasukawa, Susono, JP;
Teruhiko Namiki, Mishima, JP;
Hiroki Murata, Shizuoka-ken, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A power supply unit in an image forming apparatus is provided. The power supply unit includes a piezoelectric transformer, an output voltage detecting circuit which detects the output voltage of the piezoelectric transformer, an output voltage control circuit which controls an output voltage from the piezoelectric transformer, and includes a comparator which receives an output voltage setting signal, together with an output voltage detecting signal fed back from the output voltage detecting circuit, to compare the output voltage setting signal and the output voltage detecting signal. The power supply unit also includes a driving frequency supplying circuit which generates a driving frequency signal of the piezoelectric transformer in accordance with a comparison result by the comparator, and supplies the driving frequency signal to the piezoelectric transformer. The time constant of the output voltage control circuit is longer than the time constant of the output voltage detecting circuit.