| 摘要 |
PROBLEM TO BE SOLVED: To provide a dynamic damper reducing not only external vibration but also internal vibration, showing a steady effect from a low speed to a high speed, and manufactured in low cost with a simple construction, and an optical disk device provided with the same. SOLUTION: An elastic part made of polymer elastic body having a loss factor tanδunder 0.3 at a room temperature and a balance plate part are integrated in this dynamic damper.
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