| 摘要 |
PURPOSE:To prevent torsional resonance, by using a counterweight provided to a holding member and setting the center of gravity of the holding member at a driving point. CONSTITUTION:The holding member 8 is fitted with the counterweight 29 for center-of-gravity adjustment. When the center of gravity of the holding member 8 fitted with the counterweight 29 coincides with the driving point, there is no abnormal resonance and extremely excellent characteristics are obtained. In general, this kind of driving device has an objective lens with short focal length close to a disk and the adjustment of the center of gravity of the holding member 8 using the counterweight 29 is effective to an electromagnetic driving device which generates specific driving force. |
