Apparatus for playing back data read out of data tracks on a rec

Details Apparatus for playing back data read out of data tracks on a rec Apparatus for playing back data read out of data tracks on a rec

1988-09-28

1991-09-17

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 44320, 369 44340, G11B 7095

Patent

active

050501518

ABSTRACT:
An arrangement for playing back data read out of data tracks on a recorded medium, in which a tracking circuit positions a beam of light on data tracks of the recorded medium. From a photodetector with a plurality of photodiodes, there are generated a data signal, a focusing-error signal, and a tracking-error signal. These signals result from the beam of light that is reflected by the recorded medium onto the photodetector. An offset-compensation voltage is applied to one input of a tracking control amplifier in the tracking circuit. The tracking error signal is generated from photovoltages of predetermined ones of photodiodes. The offset-compensation voltage is varied until one of the photovoltages is equal to the sum of the offset-compensation voltage and of another one of the photovoltages to maintain the operating point of the tracking circuit at an optimal midpoint.

REFERENCES:
patent: 4190859 (1980-02-01), Kinjo
patent: 4589103 (1986-05-01), Tajima
patent: 4663751 (1987-05-01), Kaku et al.
patent: 4691308 (1987-09-01), Takagi et al.
patent: 4794244 (1988-12-01), Kimura
patent: 4807207 (1989-02-01), Konno

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