Optical recording method having two degrees of reflectivity and a diffraction grating or hologram formed integrally thereon and process for making it
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United States of America Patent
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Aug 11, 1992
Grant Date -
N/A
app pub date -
Dec 7, 1989
filing date -
Apr 12, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optical recording medium of the present invention has on a substrate information recording patterns (2) and (3) distinguishable by a difference in light reflectivity, and is characterized in that said information recording pattern (2) is comprised of a portion (2a) of high reflectivity and a portion (2b) of low reflectivity and at least a part of said information recording patterns is formed by a diffraction grating or hologram (3). Since such plural types of information can be formed at the same time and at high density, the present invention has a merit of its having excellent fake-proofness and its manufacturing process being simplified.
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