Directly machined raised structure retroreflective cube corner article and method of manufacture
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United States of America Patent
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Jun 22, 1999
Issued Date -
N/A
app pub date -
Aug 8, 1997
filing date -
Oct 20, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A cube corner article and method of manufacturing the article from a series of directly machinable unitary substrates. The method of manufacture comprises the first step of providing an initial unitary directly machinable substrate of material suitable for forming retroreflective surfaces. Then, a first cube corner element array zone is formed having a plurality of geometric structures including cube corner elements. The zone is created by directly machining at least two sets of parallel grooves in the substrate. A replica of the cube corner element array zone is formed as an additional unitary substrate suitable for forming retroreflective surfaces. Portions of the replica substrate material are removed. The removal of these portions forms at least two intersecting cavities bounded by side walls in the replica at a depth at least that of the cube corner elements formed by the groove sets. Each cavity comprises at least one side wall which extends to a depth into the replica substantially equal to the deepest depth of any other intersecting cavity.
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