COVERED DEVELOPER ROLL AND DEVELOPING DEVICE

摘要

PROBLEM TO BE SOLVED: To improve the uniformity of conductivity by the molecular dispersion of a conductive induced component in coating so as to be able to control for the attainment of a desired charge relaxation time constant. SOLUTION: A device for developing a latent image recorded on the surface includes a housing 44 partitioning a chamber 76 stored with a supply source of developer material containing a carrier and toner, a toner doner member 42 coated (70) and arranged with a fixed space from the surface so as to transport toner to an area opposed to the surface as well as positioned near the surface of a dielectric core roll, and a means 98 for advancing the developer material in the chamber 76 of the housing 44. The means 98 for advancing the developer material, and the doner member 42 cooperate with each other to partition an area where a fixed quantity of toner with fixed frictional electric charge is accumulated at the doner member 42.