Apparatus for reading a record carrier with an optical informati

Details Apparatus for reading a record carrier with an optical informati Apparatus for reading a record carrier with an optical informati

1977-07-05

1979-04-17

Cardillo, Jr., Raymond F.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

1791003V, H04N 576, G11B 712

Patent

active

041503996

ABSTRACT:
In an apparatus for reading a record carrier on which information is stored in an optically readable structure, the radiation which is supplied by the radiation source is split into a read beam and an auxiliary beam for determining the focussing of the read beam on the record carrier. Said auxiliary beam is intercepted by two radiation-sensitive detectors. By disposing a radiation-absorbing knife between the radiation source and the Wollaston prism a part of the auxiliary beam is blocked. Thus, an accurate indication can be obtained of the magnitude and the direction of a focussing error.

REFERENCES:
patent: T953002 (1976-12-01), Firester
patent: 3829622 (1974-08-01), Elliot
patent: 3876841 (1975-04-01), Kramer et al.
patent: 3876842 (1975-04-01), Bouwhuis
patent: 3969576 (1976-07-01), Boonstra et al.

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