Raised zone retroreflective cube corner article and method of manufacture
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United States of America Patent
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Jun 2, 1998
Issued Date -
N/A
app pub date -
Oct 3, 1996
filing date -
Oct 20, 1993
priority date (Note) -
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status (Latency Note)
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Abstract
A cube corner article and method of manufacturing the article from a series of unitary substrates. A plurality of pins are assembled to form a mold having an array of cube corner elements on a surface. Then, a replica of the cube corner element array is produced in a substrate suitable for forming retroreflective surfaces. Portions of the replica substrate material are removed. The removal of these portions forms at least one cavity bounded by side walls in the replica at a depth at least that of the cube cube corner elements. The replica is replicated to produce an additional directly machinable substrate suitable for forming retroreflective surfaces having at least one raised section having sidewalls at a height at least that of the cube corner elements. At least one raised section is directly machined to form an array of cube corner elements.
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