Abstract
We have developed an objective lens actuator for high-speed CD-ROM drives. It has high acceleration sensitivity and good vibration characteristics so that it can follow a rapidly rotating disc. We produced a novel actuator structure which contains an inner yoke with four planes. This increases the acceleration sensitivity and stiffness of the actuator. We measured the acceleration sensitivity to be 140 m/s2/V in the AF (auto focus) direction and 90 m/s2/V in the TR (tracking) direction. The higher-order resonant frequency is over 30 kHz in both directions. These values are high enough for 40 X or faster CD-ROM drives.
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