Abstract
We developed a lens actuator suitable for high-speed seek and thin-type CD-ROM drives. The actuator is supported by 4 suspensions which are put in order in a plane and radiated to outer fixed ends arroud the center pin. Each suspension has a flexible part that adjusts the lowest-main natural frequencies in the auto-focus and tracking direction. The main natural requencies are determined taking into consideration for controllability. Dynamics design of the actuator at the frequency around 1 kHz is important for keeping the servo system stable. We investigated the phase-delay phenomina at the frequency in our prototype actuator. The phenomina are modeled by a vibration system which consists of a contact stiffness between lens holder and center pin and the moment of inertia of the actuator. The normalized imbalance of the actuator is to be within 2% to achieve the stable condition in auto-focus servo system.
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