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. 19, 2014
Filed:
Dec. 21, 2010
Takamasa Hase, Kanagawa Prefecture, JP;
Masanao Ehara, Kanagawa Prefecture, JP;
Kenji Ishii, Kanagawa Prefecture, JP;
Tadashi Ogawa, Tokyo, JP;
Satoshi Ueno, Tokyo, JP;
Hiroshi Seo, Kanagawa Prefecture, JP;
Takahiro Imada, Kanagawa Prefecture, JP;
Shuutaroh Yuasa, Kanagawa Prefecture, JP;
Takamasa Hase, Kanagawa Prefecture, JP;
Masanao Ehara, Kanagawa Prefecture, JP;
Kenji Ishii, Kanagawa Prefecture, JP;
Tadashi Ogawa, Tokyo, JP;
Satoshi Ueno, Tokyo, JP;
Hiroshi Seo, Kanagawa Prefecture, JP;
Takahiro Imada, Kanagawa Prefecture, JP;
Shuutaroh Yuasa, Kanagawa Prefecture, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
The fixing device using an electromagnetic induction heating (IH) method includes a fixing sleeve having a heating layer, a pressure roller to form a nip while contacting the fixing roller and rotate to drive the fixing sleeve, a temperature detector to detect a temperature on a circumference of the fixing sleeve, and an excitation coil provided near the fixing sleeve and configured to perform induction heating of the heating layer of the fixing sleeve based on the detection result from the temperature detector. The fixing device is configured to change a rotation speed of the fixing sleeve in a standby time during which the fixing sleeve, while rotating, is controlled to be heated so as to maintain a target temperature when a periodic temperature difference occurs on a circumference of the fixing rotary member and having a fluctuation amplitude larger than a predetermined value compared to the target temperature.