Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1980-09-22
1982-12-07
Cardillo, Raymond F.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
369 18, 369109, 369 54, 250562, 250572, 356355, 356237, G11B 2736, G01N 2132
Patent
active
043631185
ABSTRACT:
Apparatus provides an incident light beam which illuminates the surface of a grooved disc, having signal elements recorded therein in the form of a succession of spaced apart depressions, with a light spot that spans a plurality of convolutions of the groove. The structure of the groove convolutions and signal elements forms a two-dimensional diffraction grating which reflects light into a plurality of diffraction order beams. Photodetectors, respectively positioned to intercept several of the reflected beams provide outputs corresponding to the light power in the respective reflected beams. Estimations of signal element depth in the region illuminated by the light spot may be made from the measured light powers.
REFERENCES:
patent: Re30723 (1981-08-01), Heine
patent: 1916973 (1933-07-01), Friebus
patent: 3842194 (1974-10-01), Clemens
patent: 3919465 (1975-11-01), Adler et al.
patent: 4044379 (1977-08-01), Halter
patent: 4155098 (1979-05-01), Roach et al.
patent: 4180830 (1979-12-01), Roach
Roach et al., "Diffraction Spectrometry for VideoDisc Quality Control," RCA Review, vol. 39, Sep. 1978, pp. 472-511.
Gorog Istvan
Roach William R.
Cardillo Raymond F.
McElheny Jr. Donald
RCA Corporation
Roehling J. E.
Tripoli J. S.
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