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:
Oct. 14, 2025
Filed:
Mar. 02, 2023
Naohiro Kumagai, Kanagawa, JP;
Yuusuke Furuichi, Kanagawa, JP;
Daisuke Hirano, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An image forming apparatus includes a fixing device, a power supply, and a transfer device. The fixing device includes a fixing belt grounded via a protective resistor, a heater contacting the fixing belt, and a pressure rotator grounded and facing the fixing belt to form a nip. The power supply applies an alternating current voltage to the heater. The transfer device includes a transferor grounded and an opposed rotator facing the transferor to form a nip. The transferor has a transfer resistance Rt satisfying a following expression, where Rf is a resistance value of the protective resistor, Rp is a resistance value of a recording medium, jXs is an impedance of the fixing belt, and jXh is an impedance of the heater.