Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
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.
Matsui Fumio
Tanaka Satoru
Yangisawa Shuichi
Pioneer Electronic Corporation
Young W. R.
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