Dual layer optical medium having partially reflecting thin film layer
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United States of America Patent
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Jul 30, 1996
Grant Date -
N/A
app pub date -
Aug 5, 1994
filing date -
Aug 5, 1994
priority date (Note) -
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Abstract
A dual layer pre-recorded optical disc includes a transparent substrate, a partially reflective layer, a transparent spacer layer, and a highly reflective layer. One pattern of data pits is provided on the substrate, adjacent the partially reflective layer, and another pattern of data pits is provided on the spacer layer, adjacent the highly reflective layer. The partially reflective layer may be made of silicon carbide. A substrate-incident beam can be used to read data encoded in either data pit pattern depending on which layer the laser is focused upon. The dual layer disc has twice the data storage capacity of conventional single layer discs.
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