| 摘要 |
PROBLEM TO BE SOLVED: To provide a developing roller which substantially prevents image failure, such as spots, density unevenness, and white image fogging, as far as possible, satisfactorily deals with a color image as well, and securely obtains a high quality image. SOLUTION: The developing roller has at least one resin coating layer 3a on the peripheral face of an elastic layer 3. The resin coating layer 3a comprises an ultraviolet curing type resin or an electron beam curing type resin. A voltage of 8 kV is applied to a corona discharger disposed 1 mm away from the surface of the resin coating layer 3a. Thereby corona discharge is generated to electrify the surface of the layer 3a. In this case, the maximum value of the surface potential after 0.35 sec is equal to or lower than 90 V. COPYRIGHT: (C)2005,JPO&NCIPI |
