| 摘要 |
PURPOSE:To enhance the quality of image by decreasing speed variation of the rotor of an electrophotographic image output apparatus. CONSTITUTION:A sensitive drum 2 is coupled with the drive shaft 13 on the farther side of a driving gear 11, and an inertial member 8 is installed inside of the drum 2, and a rotary member 18, in which an oil having a high viscosity resistance is encapsulated, is contacted with the drum 2 in its position not related to image formation. Thereby the inertia moment of the driving system is increased and the natural frequency is sunk to prevent resonance of the sensitive drum 2 which is a rotor, and also the damping coefficient ratio zetaof the drum 2 is raised to allow quick damping of momentary speed variation, and the rotating speed is kept constant and speed variation is decreased which should lead to producing of an enhanced image quality. |
