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

1975-01-22

1976-07-13

Cardillo, Jr., Raymond F.

Telegraphy

Systems

Simplex-reversing periodic

178 66DD, 178 67A, 1791003V, 250201, H04N 576, G11B 712, G11B 1700

Patent

active

039695760

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: 3829622 (1974-08-01), Elliot
patent: 3876841 (1975-04-01), Kramer et al.
patent: 3876842 (1975-04-01), Bouwhuis

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