Optical disk arrangement with diffractive tracks allowing positional control
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United States of America Patent
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Jan 26, 1993
Issued Date -
N/A
app pub date -
Nov 19, 1991
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 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 system for projecting a concentrated light spot onto the carrier along a track wherein the diffraction is such that the light emerging from the diffractive track has a spatial distribution representing an amount of track misregistration between the spot and the axis of the track.
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