Multilevel recording and reproduction method and phase change multilevel recording medium
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United States of America Patent
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May 20, 2003
Grant Date -
Nov 1, 2001
app pub date -
Apr 26, 2001
filing date -
Oct 26, 1998
priority date (Note) -
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Abstract
A multilevel recording method based on a principle utilizing a phase change medium. The method radiates a recording energy beam against an information recording medium having a recording layer to locally melt the recording layer. The recording layer is adapted to produce a phase change between a crystalline state and an amorphous state upon being radiated with an energy beam. An amorphous mark is formed by cooling during a solidifying process to record information in the medium. The size of the amorphous mark is controlled mainly by a competition between a recrystallization process and an amorphization process during the solidifying process. An intensity of reflected light from a reproducing light beam radiated region is controlled in three or more multiple recording levels according to an optical characteristic difference between a crystalline region and an amorphous region and their areas.
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