Optical recording medium with a diffraction grating layer
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United States of America Patent
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Aug 12, 1997
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N/A
app pub date -
Aug 3, 1995
filing date -
Aug 30, 1994
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Abstract
A system for the optical writing/reading of a recording medium, the system including at least one light source emitting three beams that focus at three distinct points on the recording medium and a diffraction device creating three orders of diffraction, -1, 0 and +1, for each beam, the focusing points of the three beams being aligned in the direction of diffraction of the diffraction device and being at a distance from one another so that, at the focusing point of the 0 order diffraction of the central beam, there is focused the -1 order diffraction of one lateral beam and the +1 order diffraction of the other lateral beam.
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