Cube corner articles exhibiting improved entrance angularity...

G - Physics – 02 – B

Patent

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Details

G02B 5/124 (2006.01)

Patent

CA 2221189

The present invention provides cube corner retroreflective articles that have improved retroreflective performance in at least one plane, and preferably in two or more planes. A preferred article is a retroreflective sheeting that includes a structured surface having at least one array of cube comer elements oriented at a predetermined angle relative to the edge of the article. The angle is selected to align one broad plane of entrance angularity approximately parallel with the edge of the sheeting and another broad plane of entrance angularity approximately perpendicular to the edge of the sheeting. Individual cube corner elements on the structured surface are canted to yield an isosceles base triangle or a scalene base triangle. Additionally, the structured surface may include a plurality of cube corner element arrays arranged in a tiled fashion to yield greater than two planes of broad entrance angularity.

La présente invention concerne des articles rétroréfléchissants en forme de trièdre trirectangle dont la qualité de rétroréflexion est améliorée sur au moins un plan et, de préférence, sur deux plans, voire plus. On utilisera de préférence un revêtement rétroréfléchissant composé d'une surface structurée ayant au moins une rangée d'éléments en forme de trièdre trirectangle orientés selon un angle donné par rapport à l'arête de l'article. L'angle choisi permet d'aligner un large plan d'angles de projection, plus ou moins parallèle au bord du revêtement, avec un autre large plan d'angles de projection, plus ou moins perpendiculaire au bord du revêtement. Des éléments individuels en forme de trièdre trirectangle de la surface structurée sont biseautés de façon à former un triangle de base isocèle ou scalène. De plus, la surface structurée peut comprendre une pluralité de rangées d'éléments en forme de trièdre trirectangle alignés comme des tuiles, ce qui permet d'obtenir plus de deux plans d'angles de projection.

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