Optical disc players

Details Optical disc players Optical disc players

1984-02-23

1986-12-30

Faber, Alan

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 45, G11B 7095

Patent

active

046334530

ABSTRACT:
An optical disc player for reproducing an information signal from an optical disc on which the information signal is recorded in the form of pits arranged in a record track comprises an optical arrangement for directing a light beam to the optical disc to be modulated by the record track and reflected thereat, a photodetecting assembly for receiving a reflected light beam from the optical disc to produce in response to the received light beam an output from which a reproduced information signal can be obtained, and a control circuit portion including a tracking error signal producing circuit for generating a tracking error signal from the output of the photodetecting assembly when a beam spot formed by the light beam on the optical disc is positioned on the pit and a focus error signal producing circuit for generating a focus error signal from the output of the photodetecting assembly when the beam spot formed by the light beam on the optical disc is positioned on a plane portion of the optical disc between the pits.

REFERENCES:
patent: 4502134 (1985-02-01), Kondo
patent: 4503324 (1985-03-01), Yokota

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