Fresnel lens angular segment manufacturing apparatus and method
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United States of America Patent
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Sep 7, 2010
Grant Date -
Jun 26, 2008
app pub date -
Dec 24, 2007
filing date -
Dec 22, 2006
priority date (Note) -
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Abstract
A roller extruder for manufacturing Fresnel lens angular segments from raw plastic, the roller extruder having a blank roller and a die roller positioned a desired roller clearance from the blank roller, the die roller having two peripheral lens dies with an angular displacement between the lens dies increasing linearly from a die junction at the inside roller edge to approximately three hundred sixty degrees at the outside roller edge, and the die roller having peripheral Fresnel facet dies.
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