Apparatus for optically reading a radiation-reflecting record ca

Details Apparatus for optically reading a radiation-reflecting record ca Apparatus for optically reading a radiation-reflecting record ca

1975-02-11

1976-11-09

Canney, Vincent P.

Telegraphy

Systems

Simplex-reversing periodic

1791003V, 178 67A, 250566, 178 66DD, H04N 576, G11B 1100

Patent

active

039912752

ABSTRACT:
An apparatus is described for reading a radiation-reflecting record carrier on which information is stored in an optically readable structure. For separating the modulated and the unmodulated read beam, the radiation path from the radiation source to the record carrier includes a beam-splitting element with such a reflection coefficient that only a small part of the modulated read beam returns to the radiation source, while a sufficiently large part of said beam reaches a radiation-sensitive detector.

REFERENCES:
patent: 3876842 (1975-04-01), Bouwhuis
patent: 3919698 (1975-11-01), Bricot
"The Philips `VLP` System"; by K. Compaan and P. Kramer; Philips Tech. Rev. 33, No. 7, Oct., 1973, pp. 178-180.
"An Experimental Optical Videodisc Playback System", by G. W. Hrbek, July, 1974, Journal of the SMPTE, vol. 83.

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