| 摘要 |
PROBLEM TO BE SOLVED: To uniformly electrify an image carrier even by a contact electrifying means at the time of forming an image consecutively by disposing a brush electrifying means electrifying the image carrier the same as a specified polarity in contact with the image carrier on the upstream side of a discharging means in the turning direction of the image carrier. SOLUTION: An electrifying brush 7 on which -500V voltage is impressed is disposed in contact with a photoreceptor 1 on the upstream side of a discharging lamp 8 on the upstream side in the rotating direction of the photoreceptor 1. The brush 7 is obtained by arranging plural conductive fibers 21 made of polyphenylenesulfide whose resistance value is 1×10<5>Ω.cm and interposing them in a holder 20 made of aluminum or conductive resin, and the voltage is impressed on the holder 20 by a power source. Therefore, the part of the surface of the photoreceptor 1 electrified to be positive is all temporarily electrified to be negative and the surface of the photoreceptor 1 on which the action of the lamp 8 works is set to uniform negative low potential. Then, the surface of the photoreceptor 1 on which the action of an electrifying roller 2 works in order to form the image for next time is uniformly electrified. |
