Optical disc mold having diamond-like carbonaceous layer and a molding method using the same
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United States of America Patent
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Issued Date -
Jun 30, 2005
app pub date -
Oct 25, 2004
filing date -
Dec 26, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
In order to shorten the cycle time of the molding operation, the present invention provides a mold for molding optical discs wherein irregularity having a controlled surface roughness is formed on a stamper-holding surface in a molding cavity of a mold in such degree that said irregularity is not transferred to the stamper surface, and a diamond-like carbonaceous layer is integrally formed on said surface. A method for molding optical discs comprising steps of mounting a stamper having an information pattern surface onto a stamper holding surface in a molding cavity of a mold according to the present invention and injecting a molten resin material into the cavity.
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