Seek control circuit for suppressing vibration of objective lens

Details Seek control circuit for suppressing vibration of objective lens Seek control circuit for suppressing vibration of objective lens

1996-03-18

1997-09-30

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4432, G11B 7085

Patent

active

056732406

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.

REFERENCES:
patent: 4837757 (1989-06-01), Okada et al.
patent: 5572494 (1996-11-01), Nakane et al.

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