Optical sheet manufacture method and optical sheet
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United States of America Patent
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May 13, 2014
Grant Date -
Sep 18, 2008
app pub date -
Mar 12, 2008
filing date -
Mar 16, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
A manufacture method of an optical sheet made of a transparent thermoplastic resin sheet on whose surface a regular geometric design working is performed, the optical sheet manufacture method comprising steps of performing a geometric design working on the resin sheet at a temperature not lower than a glass transition temperature of the resin sheet, by using a metal endless working belt formed with a geometric design on a surface thereof, rapidly cooling the resin sheet on which the geometric design working is performed to a temperature lower than the glass transition temperature, and detaching the rapidly cooled resin sheet from the metal endless working belt.
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