Patent ID: 9201349
Filing Date: 2015-12-01
Classification: G03G

Abstract:
1. A developing device comprising: a developing roller disposed to face, without contact, an outer circumferential surface of an image carrier, and including an aluminum oxide thin film and a resin coat layer, the aluminum oxide thin film being formed on an outer circumferential surface of a base body that is made of a metal including aluminum, the resin coat layer being formed on a surface of the aluminum oxide thin film, the resin coat layer being made of a resin material having electric conductivity; a magnetic roller disposed to face, without contact, an outer circumferential surface of the developing roller, and including an aluminum oxide thin film formed on an outer circumferential surface of a base body that is made of a metal including aluminum, the magnetic roller forming a toner layer on a surface of the developing roller via a magnetic brush composed of toner and magnetic carrier, wherein an AC impedance Z a ratio Z