Record carrier on which information is stored in an optically re

Details Record carrier on which information is stored in an optically re Record carrier on which information is stored in an optically re

1974-04-29

1976-12-21

Cardillo, Jr., Raymond F.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

1791003V, 274 41R, H04N 576, G11B 724

Patent

active

039990087

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 at least one of the surfaces of the record carrier body excursions which are periodically variable in the track direction, it is possible in a simple manner to obtain an indication of the focussing of the read beam on the information structure during reading of the record carrier.

REFERENCES:
patent: 3126535 (1964-03-01), Streeter
patent: 3663764 (1972-05-01), Trost
patent: 3673412 (1972-06-01), Olson
patent: 3800100 (1974-03-01), Runge
patent: 3829605 (1974-08-01), Pickopp
patent: 3833769 (1974-09-01), Compaan et al.
patent: 3848095 (1974-11-01), Wohlmut et al.
patent: 3931460 (1976-01-01), Watson
Frosch et al., IBM Tech. Disc. Bulletin, vol. 15, No. 2, July, 1972, pp. 504-505.

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