Dual layer optical medium having partially reflecting thin film

Details Dual layer optical medium having partially reflecting thin film Dual layer optical medium having partially reflecting thin film

1994-08-05

1996-07-30

Edwards, N.

Stock material or miscellaneous articles

Circular sheet or circular blank

428 642, 428 644, 428 647, 428913, 4304951, 430945, 4302721, 3692751, 3692753, 369283, 369288, B32B 300

Patent

active

055409660

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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