| 摘要 |
PURPOSE:To surely remove high-frequency abnormal noises uncomfortable to the ears so that a silent operation can be made by inserting a vibration damping member such as foamed urethane into a photosensitive drum in contact with wit the inside wall surface of the photosensitive drum. CONSTITUTION:The vibration damping member 11 such as foamed polyurethane is provided on the photosensitive drum 1 in contact with the inside wall surface of the drum 1. The abnormal noises uncomfortable to the ears are generated when the friction force acting between the drum 1 and a cleaning blade is negative attenuation. If, however, the vibration damping member such as foamed polyurethane is inserted into the photosensitive drum in contact with the inside wall surface thereof, the member 11 oscillates with the inside wall of the drum 1 tending to oscillate and imparts positive attenuation to the drum 1 and, therefore, the oscillation beginning to be generated in the drum is sharply attenuated. The self-excitated oscillation is eventually not generated and the abnormal noises are thoroughly prevented. |
