Optical data storage apparatus and method
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United States of America Patent
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Aug 10, 1993
Issued Date -
N/A
app pub date -
Mar 27, 1991
filing date -
Sep 29, 1989
priority date (Note) -
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Abstract
An optical data storage apparatus and disc in which information is stored in the form of multiple submicron depths at information-storage sites on the disc surface. The depth information is read by directing a focused laser beam onto the storage sites, back reflecting a portion of the reflected beam into the laser cavity, and converting power fluctuations in the laser beam to submicron distance measurements.
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