Recording/reproducing system using wavelength/depth selective optical storage medium
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United States of America Patent
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Jan 11, 1994
Issued Date -
N/A
app pub date -
Nov 16, 1990
filing date -
Sep 22, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Apparatus and method for encoding information and recording same as sets of variably spaced related marks stored in wavelength (color) and/or depth selective layers on the optical record wherein the encoded information is read by illuminating each set of such recorded marks selected by wavelength (color) or focal depth with a coherent read light to cause an optical interference pattern consisting of a varying distribution of amplitude maxima separated by amplitude nulls (or minimas) that change in accordance with the encoded information. This read interference pat-tern is detected by photosensing diode arrays and after decoding, the system outputs an information signal representing the original information.
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