Optical disk drive focus servo control system with focus servo b

Details Optical disk drive focus servo control system with focus servo b Optical disk drive focus servo control system with focus servo b

1994-01-27

1994-10-18

Young, W. R.

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With servo positioning of transducer assembly over track...

Optical servo system

369 4432, 369 4435, 369 54, G11B 7095

Patent

active

053574966

ABSTRACT:
A focus servo control system for use in optical disk drive units prevents a large current from continuously flowing through a focus actuator coil FC when a focus error signal FES in the focus servo loop increases while a track servo loop is in an "off" state, thereby preventing deterioration of the coil FC. The focus servo control further includes a controller for detecting a length of time during which an "off" state of the track servo loop in a servo controller continues, and for turning off the focus servo loop or, alternatively, reducing the gain of the focus servo loop when the detected length of time exceeds a predetermined value.

REFERENCES:
patent: 4613963 (1986-09-01), Hirano
patent: 5103439 (1992-04-01), Bierhoff et al.
patent: 5146443 (1992-09-01), Iwase et al.

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