Rotatable record carrier and method and apparatus for producing

Details Rotatable record carrier and method and apparatus for producing Rotatable record carrier and method and apparatus for producing

1977-11-14

1979-02-27

Cook, Daryl W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

1791003V, 346 76L, 346137, 365215, G11B 700

Patent

active

041422104

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. A method of producing this record carrier is disclosed wherein, although the linear velocity of each track is dependent upon the radius of the track, the length of the pits in the respective tracks does not vary as a function of the change in the radius from one track to the next. A light beam is modulated with a rectangular pulse information signal, the duration of each pulse being controlled as a function of the radius of the track which is being scanned by the modulated light beam. For tracks having a smaller radius, the pulse duration is made larger than for tracks having a larger radius. When the record carrier of this invention is used for optically reproducing the recorded information signals, a proper relationship between the size of the scanning beam spot and the length of the recorded pits can be maintained merely by retaining a substantially constant beam spot.

REFERENCES:
patent: 3423524 (1969-01-01), Bradford
patent: 3646259 (1972-02-01), Schuller
patent: 3906152 (1975-09-01), Hoogendijk

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