Reading device for multi-layered optical information carrier
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United States of America Patent
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Oct 5, 1993
Grant Date -
N/A
app pub date -
May 29, 1992
filing date -
May 29, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A device for reading data stored in a high density multi-layered optical information carrier. Data which is stored in a carrier having a plurality of partially reflective data layers is read by wavefront shearing interferometry with low interlayer crosstalk. This allows data layers to be more closely spaced than previously possible thereby reducing spherical aberration and increasing the data density.
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