Optical disk arrangement with closed contours whose entire extent represents information
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United States of America Patent
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Oct 2, 1990
Issued Date -
N/A
app pub date -
May 23, 1989
filing date -
Aug 25, 1972
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention relates to systems for reproducing signals, from a record whose engraved surface contains a recorded track in the form of an embossed print made of diffractive elements, representing the time variation of a pulse time modulated waveform. In accordance with the invention, there is provided a record and an optical read-out device wherein the relief elements carried by the record have a width in the order of the wavelength of the concentrated read-out radiation for determining a spatial variation in the diffracted energy emerging from the illuminated portion of the record, this variation being detected with photo-electric elements.
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