Track servo pull-in method and apparatus for an optical disc

Details Track servo pull-in method and apparatus for an optical disc Track servo pull-in method and apparatus for an optical disc

1991-09-12

1994-04-26

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 44250, 369 44340, 369 44360, G11B 7085

Patent

active

053073339

ABSTRACT:
An optical information memory apparatus in which after a coarse seeking operation to position an optical head to a position near a seeking target address at a high speed has been executed, only at a time point when a light spot has reached a predetermined region from the center of a track near a seeking target address, the pull-in control of the light spot to the track center is executed. The optical information memory apparatus has: a zero-cross pulse generator for receiving a tracking error signal and for producing tracking error zero-cross pulses; and a window comparator for receiving the tracking error signal and for producing tracking error window pulses which are obtained by slicing the tracking error signal by predetermined binary slice levels of an upper limit and a lower limit. Further, at a time point when a period of time of the low level of the tracking error zero-cross pulse is equal to or larger than a predetermined time interval T.sub.0 and the tracking error window pulse has been set to the low level, the tracking control to pull the light spot into the track near the desired seeking target address is executed.

REFERENCES:
patent: 4785439 (1988-11-01), Okada et al.
patent: 5056074 (1991-10-01), Toteishi et al.

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