Retroreflective articles having moire-like pattern
First Claim
1. Retroreflective sheeting comprising a polymeric sheet having an array of cube corner elements wherein light reflected from the array of cube corner elements comprises a moiré
- -like pattern.
1 Assignment
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Accused Products
Abstract
The invention relates to articles comprising a sheeting having a microstructured surface that reflects light in a moiré-like pattern. The invention further relates to methods of making a master and replicas thereof including tooling that results in sheeting having such pattern. A preferred 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 formed in such a manner that adjacent parallel grooves have substantially the same groove spacing and groove depth throughout the array. The master as well as corresponding tooling and sheeting preferably have a 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 a groove spacing of less than about 0.004 inches (0.1016 mm).
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Citations
28 Claims
- 1. Retroreflective sheeting comprising a polymeric sheet having an array of cube corner elements wherein light reflected from the array of cube corner elements comprises a moiré
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14. A method of making a master by forming three sets of V-shaped grooves in a substrate such that the intersections form an array of cube-corner elements;
- wherein the grooves in each set are formed with a groove position precision that is at least as precise as +/−
800 nm and the grooves have substantially identical groove spacing and groove depth and the groove spacing is in the range from 0.0005 inches (0.0127 mm) to 0.0070 inches (0.1778 mm). - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
- wherein the grooves in each set are formed with a groove position precision that is at least as precise as +/−
Specification