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. 12, 2007
Filed:
Dec. 14, 2004
Chikara Hiraoka, Hitachi, JP;
Toru Hanashima, Hitachi, JP;
Tetsuji Takegoshi, Hitachi, JP;
Goro Sato, Tsuchiura, JP;
Shogo Matsumoto, Hitachi, JP;
Chikara Hiraoka, Hitachi, JP;
Toru Hanashima, Hitachi, JP;
Tetsuji Takegoshi, Hitachi, JP;
Goro Sato, Tsuchiura, JP;
Shogo Matsumoto, Hitachi, JP;
Ricoh Printing Systems, Ltd., Tokyo, JP;
Abstract
An image forming apparatus includes a fixing device having a pressure roller. The surface of the pressure roller is coated with a PFA resin and has an average surface roughness Ra of 0.05 to 0.13 μm. A thermister is provided to detect the surface temperature of the pressure roller. The thermister includes a metal plate, a resister element attached to the metal plate, and a pair of fluorocarbon-resin films sandwiching the metal plate and the resister element. The fluorocarbon-resin film has a thickness of 15 μm to 80 μm.