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:
Nov. 22, 2011
Filed:
Feb. 26, 2009
Shuhji Fujii, Kizukawa, JP;
Yuji Okamoto, Kyoto, JP;
Yuji Nakagawa, Kyoto, JP;
Takashi Nakagawa, Nara, JP;
Shinji Kato, Osaka, JP;
Kaoru Ishikura, Kyoto, JP;
Nobuyuki Ueda, Nara, JP;
Atsushi Ogo, Kizukawa, JP;
Shuhji Fujii, Kizukawa, JP;
Yuji Okamoto, Kyoto, JP;
Yuji Nakagawa, Kyoto, JP;
Takashi Nakagawa, Nara, JP;
Shinji Kato, Osaka, JP;
Kaoru Ishikura, Kyoto, JP;
Nobuyuki Ueda, Nara, JP;
Atsushi Ogo, Kizukawa, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A fixing device according to this invention includes a heating roller, a heater driver, a thermistor, and a CPU. The heating roller has a heater and heats a recording sheet. The heater driver drives the heater. The thermistor detects a surface temperature of the heating roller. The CPU stops an operation of the heater driver when the surface temperature of the heating roller becomes higher than a predetermined temperature and, thereafter, causes the thermistor to perform detection of the surface temperature of the heating roller for a predetermined time period and issues an alarm about occurrence of a first abnormality when the surface temperature of the heating roller fails to drop in the predetermined time period.