Master disk for making dies for pressing in particular optical disks
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United States of America Patent
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Jun 23, 1998
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N/A
app pub date -
Apr 2, 1996
filing date -
Feb 3, 1993
priority date (Note) -
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Abstract
Master disks for providing dies in particular for pressing optical disks, methods of manufacturing same, pressing dies obtained from such master disks and optical disks obtained from the latter and such pressing dies, the master disks consisting of a support carrying at its surface a succession of microcups representative of the information to be duplicated and consisting of a hard, conducting material reflecting in the near infrared range and selected from a zirconium, hafnium or titanium nitride or carbonitride, a hard ceramic reflecting in the near infrared range and conducting at the surface only and a hard glass reflecting in the near infrared range and conducting at the surface only.
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