Videodisc with undulating nested tracks

Details Videodisc with undulating nested tracks Videodisc with undulating nested tracks

1974-02-14

1980-09-16

Moffitt, James W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

1791003V, 1791003D, 360 77, 346108, 250202, 274 46R, A04N 576

Patent

active

042233470

ABSTRACT:
A record carrier is described on which information is stored in an optically readable structure of trackwise arranged areas and intermediate areas. By giving the information tracks periodic excursions towards and away from adjacent tracks, in a direction transverse to the direction of reading, the period of the excursions being substantially greater than the average period of the areas and the amplitude of the excursions being smaller than the width of the tracks, a control signal for centering the read beam of radiation on an information track can be obtained without the use of additional optical means. The excursions of the tracks have such relative phase that the tracks are in nested concentric relation and one component of the stored information represents the phase of the undulations.

REFERENCES:
patent: 3126535 (1964-03-01), Streeter
patent: 3501586 (1970-03-01), Russell
patent: 3534166 (1970-10-01), Korpel
patent: 3663764 (1972-05-01), Trost
patent: 3673412 (1972-06-01), Olson
patent: 3701846 (1972-10-01), Zenzefilis
patent: 3796825 (1974-03-01), Redlich
patent: 3798388 (1974-03-01), Dickopp
patent: 3829605 (1974-08-01), Dickopp
patent: 3833769 (1974-09-01), Compaan
patent: 3860766 (1975-01-01), Mori
patent: 3931460 (1976-01-01), Watson
"Philips On Printing Motion", by Kramer and Compaan, Eduology, vol. 4, issue 1, 1973.

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