Patent ID: 6456807
Filing Date: 2002-09-24
Classification: F16F,G03G,Y10T

Abstract:
An image forming apparatus comprising:(a) a body of rotation comprising an image carrier, which carries an image formed by an image forming means, and a first disc portion connected to the image carrier through a shaft; and (b) a body of vibration comprising a second disc portion attached on the first disc portion of the body of rotation through a body of attenuation having viscosity and elasticity; wherein fluctuation of rotating speed of the body of rotation is deterred by vibration of the body of vibration, and the body of attenuation deforms in accordance with vibration of the body of vibration; and wherein torsional natural frequency F1 obtained from a spring constant of the body of attenuation and from the moment of inertia of the second disc portion, and torsional natural frequency F2 obtained from a compound spring constant of the shaft connecting the driving system for driving the body of rotation with the first disc portion and from the moment of inertia of the body of rotation, satisfy the following expression â€ƒ0.5Ã—F2&lE;F1&lE;2Ã—F2.