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:
Dec. 01, 2015
Filed:
Dec. 15, 2014
Kyocera Document Solutions Inc., Osaka-shi, Osaka, JP;
Tamotsu Shimizu, Osaka, JP;
Shizuka Okada, Osaka, JP;
Yuji Kamiyama, Osaka, JP;
Sakae Saito, Osaka, JP;
Yasuhiro Oishi, Osaka, JP;
Masashi Fujishima, Osaka, JP;
Chikara Ishihara, Osaka, JP;
KYOCERA Document Solutions Inc., Osaka-shi, JP;
Abstract
Developing device includes developing roller and magnetic roller. Developing roller includes aluminum oxide thin film and resin coat layer. Magnetic roller is disposed to face, without contact, outer circumferential surface of developing roller, and includes aluminum oxide thin film formed on outer circumferential surface of base body that is made of metal including aluminum. Magnetic roller forms toner layer on surface of developing roller via magnetic brush composed of toner and magnetic carrier. AC impedance Z1 is in range from 1.0×10Ω to 1.0×10Ω and surface roughness Ra of resin coat layer is in range from 0.057 μm to 0.280 μm, AC impedance Z1 being obtained when AC voltage at predetermined frequency is applied to between base body of magnetic roller and base body of developing roller in a state where the magnetic brush is formed on magnetic roller.