Tri-level cube corner ruling

Details Tri-level cube corner ruling Tri-level cube corner ruling

2005-06-07

2005-06-07

Phan, James (Department: 2872)

Optical: systems and elements

Signal reflector

3-corner retroreflective

C359S529000, C428S167000

Reexamination Certificate

active

06902280

ABSTRACT:
A rulable array of cube corners defined by three sets of parallel, equidistant, symmetrical vee-grooves is provided. The directions of the three vee-groove sets make three angles, no two of which are equal. When the array in viewed in plan, lines along the roots of the grooves determine a pattern of triangles in which the apices of the cube corners lie at distances from their respective triangle's centroid that are substantially less than the distance between the triangle's orthocenter and its centroid. In an unmetallized prismatic retroreflective sheeting, the array of quasi-triangular cube corners has the entrance angularity advantages of compound cant with nearly the efficiency of uncanted triangular cube corners at small entrance angles.

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