Tracking servo apparatus for use in an optical disk player

Details Tracking servo apparatus for use in an optical disk player Tracking servo apparatus for use in an optical disk player

1994-11-07

1995-11-28

Psitos, Aristotelis

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4428, 369 4434, G11B 7095

Patent

active

054714486

ABSTRACT:
A tracking servo apparatus for an optical disk player enables a braking operation to rapidly draw into tracking servo control even in case of a double density track. The tracking servo apparatus generates an odd/even discrimination signal indicating on which of an odd number track or an even number track a position for reading information by a pick is currently present, samples a tracking error signal according to an edge position of the odd/even discrimination signal, selectively outputs either a positive or a negative section of the tracking error signal according a polarity of the sampled tracking error signal as a brake signal to a driving means for a tracking actuator, and thus draws the position for reading information by a pick-up onto a track which can be put under tracking servo control.

REFERENCES:
patent: 4980877 (1990-12-01), Sugiyama et al.
patent: 5012460 (1991-04-01), Popovich et al.
patent: 5295131 (1994-03-01), Ishibashi et al.

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