Machining techniques for retroreflective cube corner article and method of manufacture
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United States of America Patent
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Feb 4, 1997
Grant Date -
N/A
app pub date -
Oct 20, 1993
filing date -
Oct 20, 1993
priority date (Note) -
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Abstract
A method of machining a substrate to produce a cube corner element optical array. The method includes steps of directly machining a plurality of groove sets into a directly machinable substrate to form an array having a plurality of geometric structures including cube corner elements, and machining at least two of the groove sets along the same path in the substrate but at different depths of groove to produce a geometric structure side surface having both an optical portion and a non-optical portion.
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