Method and apparatus for optically reproducing a rotatable recor

Details Method and apparatus for optically reproducing a rotatable recor Method and apparatus for optically reproducing a rotatable recor

1977-11-28

1979-06-05

Konick, Bernard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

1791003V, 1791004C, G11B 718

Patent

active

041575687

ABSTRACT:
A rotatable record carrier upon which reproducible information is recorded in the form of spaced apart pits in substantially concentric circular tracks on a surface of the carrier. The pits may represent frequency-modulated information signals, and the lengths of the pits are independent of the frequency of the information signals. A method and apparatus for reproducing information from this record carrier is disclosed, wherein a light beam is used to scan the tracks of the record medium, and the size of the scanning light beam is changed as a function of the radius of the track which then is being scanned so as to increase the size of the beam when a track of larger radius is scanned. This control over the size of the scanning beam establishes a constant relationship between the size of the beam and the length of the pits despite changes in the pit length due to the different radii of the tracks.

REFERENCES:
patent: 3423524 (1969-01-01), Bradford
patent: 3646259 (1972-02-01), Schuller
patent: 3906152 (1975-09-01), Hoogendijk
patent: 4038679 (1977-07-01), Bouwhuis et al.
patent: 4118734 (1978-10-01), Bouwhuis et al.

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