Stock material or miscellaneous articles – Circular sheet or circular blank
Patent
1998-01-16
2000-02-08
Evans, Elizabeth
Stock material or miscellaneous articles
Circular sheet or circular blank
428 642, 428412, 428913, 43027011, 4304951, 430945, B32B 300
Patent
active
060226048
ABSTRACT:
The invention discloses a method and an apparatus for creating an elementary optical disc master with but a single layer to be applied to a disc substrate to form pits having ideal shapes and without berm buildup. These ideally shaped pits are improvements in the technology of disc mastering, due to the manufacturing and data playback advantages that are inherent in the ideally shaped pits. An optically active lamina consisting of a dye polymer solution of nitrocellulose and a increased dye additive is spin coated directly to a pregrooved polycarbonate substrate to enable the recording of data on the disc by laser means in the form of pits. The pits are created by having a data modulated laser focusing on the optically active lamina which reacts to the irradiation causing a pit to be formed. The resulting pit more often than not possesses a residual raised berm area surrounding the pit, in what is considered to be a less than ideal shape for a pit. The residual berm, however, is eliminated by an additional process and step of passing the recently recorded disc under a UV illumination source before application of a final conductive layer to the disc.
REFERENCES:
patent: 5099469 (1992-03-01), Dobbin et al.
patent: 5283159 (1994-02-01), Norton et al.
patent: 5304455 (1994-04-01), Van Liempd
patent: 5741627 (1998-04-01), Cubit et al.
Cubit Robert L.
Del Mar Bruce E.
English W. D.
Evans Elizabeth
ODME
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