Developing device and image forming apparatus and process cartridge incorporating same

摘要

A developing device includes a developer bearer to carry, by rotation, developer including toner and magnetic carrier to a development range facing a latent image bearer, and the developer bearer includes a magnetic field generator having multiple magnetic poles and a cylindrical developing sleeve to rotate and bear developer on an outer circumferential face thereof with magnetic force of the magnetic field generator provided inside the developing sleeve. The developing sleeve receives developing bias voltage including an AC component, and includes a base to maintain a cylindrical shape of the developing sleeve and a low friction surface layer including a material lower in friction coefficient with toner than a material of the base.

主权项

1. A developing device comprising:
a developer bearer to carry, by rotation, developer including toner and magnetic carrier to a development range facing a latent image bearer to bear a latent image, the developer bearer including: a magnetic field generator having multiple magnetic poles; and a cylindrical developing sleeve to rotate and bear developer on an outer circumferential face thereof with magnetic force of the magnetic field generator provided inside the developing sleeve, the developing sleeve to receive developing bias voltage including an AC component, the developing sleeve including:
a base to maintain a cylindrical shape of the developing sleeve, anda low friction surface layer including a material lower in friction coefficient with toner than a material of the base,wherein the low friction surface layer comprises tetrahedral amorphous carbon.