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:
Feb. 05, 2019
Filed:
May. 03, 2018
Ippei Fujimoto, Kanagawa, JP;
Kazunari Sawada, Shizuoka, JP;
Kenji Ishii, Kanagawa, JP;
Hiroshi Yoshinaga, Chiba, JP;
Takayuki Seki, Kanagawa, JP;
Ryohei Matsuda, Kanagawa, JP;
Ippei Fujimoto, Kanagawa, JP;
Kazunari Sawada, Shizuoka, JP;
Kenji Ishii, Kanagawa, JP;
Hiroshi Yoshinaga, Chiba, JP;
Takayuki Seki, Kanagawa, JP;
Ryohei Matsuda, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A fixing device includes a fixing rotator, a plurality of heat sources having different heat distributions to heat the fixing rotator, a pressing member to press the fixing rotator and form a nip to fix the unfixed toner image on the recording material, a shield disposed between the plurality of heat sources, a plurality of temperature sensors each disposed opposite to the heat source, a processor to control the plurality of heat sources so that a temperature detected by the temperature sensor becomes a predetermined target temperature. The processor controls the heaters so that a temperature difference ΔT=T2−T1 becomes greater than zero, wherein T1 is the target temperature for the temperature sensor close to an entrance of the nip, and T2 is the target temperature for the temperature sensor far from the entrance of the nip.