Apparatus for reading an optically recorded record carrier provi

Details Apparatus for reading an optically recorded record carrier provi Apparatus for reading an optically recorded record carrier provi

1975-10-29

1977-07-26

Cardillo, Jr., Raymond F.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

1791003V, 358128, H04N 576

Patent

active

040386791

ABSTRACT:
An apparatus for reading a record carrier on which information is stored in an optically readable structure of trackwise arranged areas and intermediate areas where at least one of the surfaces of the record carrier body has periodic surface undulations along the track direction. A focussing error signal is derived by reflecting a focussed light beam on the record surface and by measuring the amplitude and phase of the portion of the reflected beam that corresponds to the surface undulations.

REFERENCES:
patent: 3673412 (1972-06-01), Olson
patent: 3829605 (1974-08-01), Dickopp
patent: 3848095 (1974-11-01), Wohlmut et al.
patent: 3860766 (1975-01-01), Mori
patent: 3893163 (1975-07-01), Wessels et al.
patent: 3931460 (1976-01-01), Watson
patent: 3932700 (1976-01-01), Snopko

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