Optical disk recording and reproducing apparatus with data recor

Details Optical disk recording and reproducing apparatus with data recor Optical disk recording and reproducing apparatus with data recor

1996-03-28

1997-03-25

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4429, 369 47, G11B 7095

Patent

active

056151853

ABSTRACT:
An optical disk recording/reproducing apparatus for recording data to and reproducing data from an optical disk engraved with a groove having a wobble waveform corresponding to a signal obtained by FM modulating a carrier serving as a rotation synchronizing signal by address information where the width of the groove may be a half of a track pitch and the depth thereof may be 1/6 to 1/8 of a recording/reproducing laser beam wavelength. Circuitry may be provided for obtaining a push-pull signal from a main spot of a recording/reproducing laser beam and for using the push-pull signal as a tracking error signal. Further circuitry is provided for changing the polarity of the push-pull signal to perform a tracking control at the groove center or at the land center. Circuitry is also provided for recording or reading, while the main spot is controlled to be at the groove center, data on or from the groove center and reading the address information from the push-pull signal of the main spot. Circuitry is also provided for recording or reading, while the main spot is controlled to be at the land center, data on or from the land center and reading the address information from an output of one of divided light receiving elements of the main spot.

REFERENCES:
patent: 4067044 (1978-01-01), Maeda et al.
patent: 4232201 (1980-11-01), Canino
patent: 5023856 (1991-06-01), Raaymakers et al.
patent: 5339302 (1994-08-01), Takahashi et al.

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