Apparatus and method for reading optical discs

Details Apparatus and method for reading optical discs Apparatus and method for reading optical discs

1980-06-20

1982-09-14

Konick, Bernard

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

356354, 369 46, 369109, 369116, G11B 700

Patent

active

043499015

ABSTRACT:
Apparatus and method for reading optical discs containing information in the form of tracks of high-spacial-frequency, phase-modulating marks (e.g., depressions or pits) includes means for directing the zero and one first diffraction order of read light returned from the scanned track into superimposed relation on a photodetector and means for predeterminedly masking a portion of the zero diffraction order light so that its magnitude is more equal to that of the first diffraction order light.

REFERENCES:
patent: 3838401 (1974-09-01), Graf et al.
patent: 3919465 (1975-11-01), Adler et al.
patent: 3956582 (1976-05-01), Bouwhuis
patent: 4006293 (1977-02-01), Bouwhuis et al.
patent: 4010317 (1977-03-01), Bouwhuis
patent: 4065786 (1977-12-01), Stewart
patent: 4171879 (1979-10-01), Bricot et al.

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