Tracking apparatus for optical disk and tracking method of the s

Details Tracking apparatus for optical disk and tracking method of the s Tracking apparatus for optical disk and tracking method of the s

1993-11-29

1994-11-08

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4434, 369 58, G11B 7095

Patent

active

053633563

ABSTRACT:
A tracking apparatus for an optical disk, which has a pit array along a predetermined track, is provided with: an optical pickup for irradiating a light beam to the optical disk, and receiving a light modulated and reflected by the optical disk; a tracking error signal generating circuit for generating a tracking error signal on the basis of an output signal of the optical pickup; a tracking servo circuit for making the light beam follow the pit array when a polarity of the tracking error signal changes; a comparing circuit for comparing an amplitude of a first RF signal, which is output from the optical pickup when the polarity of the tracking error signal changes from a first polarity to a second polarity which is reverse to the first polarity, and an amplitude of a second RF signal, which is output from the optical pickup when the polarity of the tracking error signal changes from the second polarity to the first polarity, with each other; and a tracking polarity inverting circuit for selectively inverting a tracking polarity of the tracking servo circuit on the basis of a comparison result of the comparing circuit.

REFERENCES:
patent: 5042020 (1991-08-01), Endo
patent: 5056075 (1991-10-01), Maruta et al.

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