Seek control circuit for suppressing vibration of objective lens in optical head during seek operation

Abstract

The seek control circuit for an optical disk device disclosed includes an optical head movement speed detector, e.g., a linear encoder which detects a movement speed of an optical head and outputs an optical head movement speed signal; an objective lens movement speed detector, e.g., a frequency/voltage converter which provides a movement speed of the objective lens based on a tracking error signal during an optical head movement operation and outputs an objective lens movement speed signal; a relative movement speed calculator, e.g., a differential operator which provides a relative speed of the objective lens with respect to the optical head from a difference between the optical head movement speed and the objective lens movement speed and outputs an objective lens relative speed signal; and a vibration controller, e.g., a tracking actuator which controls vibration of the objective lens during the optical head movement operation in accordance with the calculated relative speed. The device thus configured is capable of making a stable seek operation at a high speed and making access to a data at a high speed without requiring a mechanism that adds to the weight of the optical head.

Dependencies are inferred from the claim text.