Methods of making a master and replicas thereof

Details Methods of making a master and replicas thereof Methods of making a master and replicas thereof

2005-01-18

2005-01-18

Chang, Audrey (Department: 2872)

Optical: systems and elements

Signal reflector

3-corner retroreflective

C359S529000, C359S546000

Reexamination Certificate

active

06843571

ABSTRACT:
The invention relates to methods of making a master and replicas thereof including tooling and retroreflective sheeting. The invention further relates to the corresponding master, tooling and in particular retroreflective sheeting. The method comprises forming V-shaped grooves in a substrate (e.g. metal plate) wherein the intersections of three grooves form cube-corner elements. The cube-corner elements are substantially the same size throughout the array. The master as well as corresponding tooling and sheeting preferably have an average groove spacing within the range of about 0.0005 inches (0.0127 mm) to about 0.007 inches (0.1778 mm) throughout the array and more preferably an average groove spacing of less than about 0.004 inches (0.1016 mm).

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