DEVELOPING DEVICE, AND PROCESS CARTRIDGE AND IMAGE FORMING DEVICE EQUIPPED WITH DEVELOPING DEVICE

摘要

PROBLEM TO BE SOLVED: To obtain an image having excellent gradation in a contact single- component developing method in which developing processing is performed in a state where a developer carrier is made to oppositely abut on or come in press-contact with a latent image carrier. SOLUTION: A developing roller 5 carrying the developer in a state where the roller 5 oppositely abuts on or comes in press-contact with a photoreceptor drum 1 is set so that electric resistance per 1 mm length in the axial direction of the roller 5 is >=0.9 and <=1.1 times -7.83×104|Q|+7.05×106Ω/mm when the electrostatic charge amount per 1 g of developer to be carried on the roller 5 is Q [μC/g].