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. 16, 2005
Filed:
Jun. 19, 2003
Applicant:
Norikazu Okada, Kanagawa, JP;
Inventor:
Norikazu Okada, Kanagawa, JP;
Assignee:
Ricoh Company, Limited, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G03G015/00 ;
U.S. Cl.
CPC ...
Abstract
An AC power source supplies power to a switching power source and a fixing heater. A power source waveform detecting circuit obtains a voltage waveform of the AC power source at a predetermined timing after the main power switch is turned on. A processor derives zero crossing information concerning zero crossing such as a zero crossing point based on the obtained voltage waveform. The processor controls power supply to the fixing heater based on the derived zero crossing information.