| 摘要 |
PURPOSE:To enable the number of parts and assembly man-hour to be reduced by using a back yoke as a dynamic damper for moving or attenuating a resonant point of a rotary axis. CONSTITUTION:A back yoke 11 is supported to a boss 7 through an elastic material layer 14 such as rubber for achieving degree of freedom which is different from a back plate 9 which is fixed by a rigid member. Therefore, an upper drum 5 and a motor part 2 move and attenuate a resonant point as a vibration model of a system of two degrees of freedom for preventing inferior influence such as jitter, thus eliminating the need for providing a dynamic damper and enabling the number of parts and assembly man-hour to be reduced. |
