Injection mold for an optical disk
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United States of America Patent
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-
May 3, 1988
Grant Date -
N/A
app pub date -
Oct 30, 1986
filing date -
Nov 1, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An injection mold for injection molding a plastic substrate for high-density information recording medium. An annular sliding member is axially slidably supported in the circumference of a disk-shaped cavity of a mold half. The annular sliding member is biased toward the surface of a disk-shaped cavity provided in another mold half so as to form the molding cavity and maintain contact with said surface during molding of said plastic substrate.
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