Apparatus for optically reading a record carrier and correcting

Details Apparatus for optically reading a record carrier and correcting Apparatus for optically reading a record carrier and correcting

1976-08-27

1978-02-14

Konick, Bernard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

1791003V, 350194, 250201, H04N 576, G11B 712

Patent

active

040743144

ABSTRACT:
An apparatus is described for reading a record carrier on which information is stored in an optically readable reflecting structure. By projecting two radiation spots one before and one behind the plane of the information structure, it is possible to ascertain whether a read beam is properly focussed on the information structure. An optical wedge-field lens combination extends the range of operation of the focus correction device.

REFERENCES:
patent: 2759393 (1956-08-01), McLeod
patent: 3833769 (1974-09-01), Compaan
patent: 3876841 (1975-04-01), Kramer
patent: 3876842 (1975-04-01), Bouwhuis
patent: 3969575 (1976-07-01), Gerritsen
patent: 3992574 (1976-11-01), Bouwhuis
patent: 3992575 (1976-11-01), Velzel

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