Optical disc player with phase shift dependent on disk rotation

Details Optical disc player with phase shift dependent on disk rotation Optical disc player with phase shift dependent on disk rotation

1988-06-02

1990-01-23

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 46, 369 48, 369195, 369199, 369 60, G11B 700

Patent

active

048963097

ABSTRACT:
A signal reproducing system for use in an optical disc player comprises a photodetector including at least first and second photodetecting elements which are so disposed that a beam spot is formed on the first and second photodetecting elements by a light beam caused to impinge upon and reflected at an optical record disc and are aligned along a direction of movement of a diffraction pattern appearing in the beam spot in accordance with a record track on the optical record disc, a phase shifter for varying at least a phase of one of first and second output signals obtained respectively based on detection outputs of the first and second photodetecting elements, a switch for causing the first and second output signals selectively to pass through the phase shifter in response to a direction of movement of the record track in relation to the light beam incident upon the optical record disc, and a mixer operative to add one of the first and second output signals derived from the phase shifter to the other of the first and second output signals so as to produce a reproduced information signal.

REFERENCES:
patent: 4455632 (1984-06-01), Braat
patent: 4787074 (1988-11-01), Deck et al.

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