Recorders – Light or beam recording
Reexamination Certificate
2006-05-09
2006-05-09
Psitos, A M (Department: 2656)
Recorders
Light or beam recording
C369S275400
Reexamination Certificate
active
07042475
ABSTRACT:
A method and apparatus for manufacturing hybrid disc whose recordable-band grooves are wider and shallower than the pre-recorded ROM data pits. The ROM pits may be pre-recorded in ROM grooves that are at least as wide, but shallower than, the ROM pits. The ROM lands intervene between consecutive ROM pits, whether or not a ROM groove is provided. In the preferred embodiment, one beam of a dual beam apparatus records the ROM pits, while the other beam records the pre-grooves, and also records the ROM groove, if present. In most embodiments a thermal mastering process provides smooth feature surfaces to facilitate replication of the hybrid disc masters. The berms normally forming at the radial extremities of the pits and grooves in the masters, by thermal expulsion processes, may be reduced or eliminated by methods taught.
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Eberly Carlyle J.
Rilum John H.
Fallow Charles W.
Koundahjian Stephen J.
Optical Disc Corporation
Psitos A M
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