Dual layer optical medium having multilayered spacer layer betwe

Details Dual layer optical medium having multilayered spacer layer betwe Dual layer optical medium having multilayered spacer layer betwe

1998-08-21

1999-11-30

Evans, Elizabeth

Stock material or miscellaneous articles

Circular sheet or circular blank

428 642, 428 644, 428 647, 428913, 43027013, 4304951, 430945, 3692753, 369283, 369288, B32B 300

Patent

active

059939303

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 transparent spacer layer comprises at least two sublayers. 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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