Seek control method in optical storage device

Details Seek control method in optical storage device Seek control method in optical storage device

1996-02-28

1997-10-07

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 32, 369 4434, G11B 7085

Patent

active

056755627

ABSTRACT:
Disclosed is a seek control method in an optical storage device, of seek-moving a light beam of an optical head from a certain track on an optical storage medium to a desired track. This seek control method comprises a step of calculating a target position, a step of detecting a present position from a track error signal indicating a relative position between the light beam and the track, a step of calculating such a feedback control quantity as to zeroize an error between the target position and the present position and a step of controlling a moving mechanism for moving the light beam in accordance with the feedback control quantity. The present position detecting step includes a first present position detecting step of detecting the present position from a signal into which the track error signal is A/D-converted when a velocity of the light beam is low and a second present position detecting step of detecting the present position from a count value obtained by counting track zero-cross signals acquired by slicing the track error signal at a zero level when the velocity of the light beam is high.

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