| 摘要 |
PROBLEM TO BE SOLVED: To securely prevent external vibration to a disk driving mechanism from being amplified and the elasticity of vibration-proof rubber from deteriorating early without making it difficult to select the raw material of the vibration- proof rubber nor increasing the cost due to an increase in the number of components. SOLUTION: When a slider 6 moves to the position shown in Fig. 5(C), a driving pin 1a of a disk driving mechanism 1 moves from the upper part 6ab to the narrow part 6ac of a positive motion cam 6a of the slider 6. The vertical width of the cam narrow part 6ac is nearly equal to the external diameter of the driving pin 1a and the disk driving mechanism 1 is supported directly by the positive motion cam 6a of the slider 6, so that the vertical movement with respect to a frame 4 is completely restricted. Consequently, the disk driving mechanism 1 is not supported in a floating state by the vibration-proof rubber 5 and the external vibration affecting the device is not amplified and propagated to the disk driving mechanism 1, which never deforms. The mass of the disk driving mechanism 1 does not affect the vibration-proof rubber 5, whose elasticity never deteriorates early.
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