Optical disk arrangement with closed contours whose entire extent represents information
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United States of America Patent
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-
Dec 29, 1992
Issued Date -
N/A
app pub date -
Jun 28, 1990
filing date -
Aug 25, 1972
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention concerns an arrangement for reading an optically readable light reflective carrier on which data is stored in the form of diffractive elements which are deviations from a reference surface. The data elements each have a plurality of adjacent tracks located on the carrier with data elements being positioned on adjacent tracks. The system utilizes an illumination device for projecting a concentrated light spot onto the carrier in order to obtain diffraction of light along the entire length of each of the data elements with an optical arrangement collecting light reflected from a carrier in such a way that the light energy which is received when a projected light spot impinges on the reference surface is greater than the light energy received when the projected light spot impinges on a data element.
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