| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an objective lens actuator which is hardly affected by higher vibration mode and increases gain crossover frequency, with respect to an objective lens actuator of a type in which the objective lens is disposed at the end of a lens holder. Ž<P>SOLUTION: A notch 20 as a discontinuous portion having discontinuous stiffness in parallel with a focusing direction is provided on top end side from an optical axis of the objective lens 11 in the lens holder 12 for holding the objective lens 11. In such configuration, the position of the node of a tertiary vibration mode exhibiting unstable control characteristics is made close to the position of the objective lens 11 to avoid the influence of the higher vibration mode. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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