| 摘要 |
PURPOSE:To prevent noise due to mechanical vibration from being introduced to a reproduced output, by coupling a driving shaft with a shaft of a motor directly or indirectly via in bellows-state or a bellows type viscoelastic coupling. CONSTITUTION:The viscoelastic coupling 13 is formed into bellows-state or bellows type with rubber of plate spring, and the torque of the motor 7 is delivered to a drive shaft 5 via the coupling 13. Thus, the vibration of the motor 7 is shut and absorbed in the coupling 13 and not delivered to the driving shaft 5. Even if there is a play between a screw 12 of the shaft 5 and internal screws of a bearing 6, the play is eliminated since the tensile strength or compressing force toward axial direction is exerted with the coupling 13. Thus, the invasion of the mechanical vibration to a linear tracking arm 3 is blocked and the introduction of noise to the reproducing sound is prevented. |
