Apparatus for optically reading a record carrier by means of an

Details Apparatus for optically reading a record carrier by means of an Apparatus for optically reading a record carrier by means of an

1974-11-26

1976-11-16

Konick, Bernard

Telegraphy

Systems

Simplex-reversing periodic

178 67A, 1791003V, 250201, H04N 576, G11B 712

Patent

active

039925757

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.

REFERENCES:
patent: 3495893 (1970-02-01), Geusic
patent: 3622797 (1971-11-01), Bragg
patent: 3833769 (1974-09-01), Compaan
patent: 3876841 (1975-04-01), Kramer
patent: 3876842 (1975-04-01), Bouwhuis

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