Tri-level cube corner ruling

G - Physics – 02 – B

Patent

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G02B 5/124 (2006.01)

Patent

CA 2504627

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.

L'invention concerne un choix de répartition de coins cubiques définis par trois ensembles de cannelures en V, parallèles, équidistantes, et symétriques. Les directions des trois ensembles de cannelure V font trois angles, deux de ces angles n'étant pas égaux entre eux. Lorsque le réseau est vu en plan, les lignes le long des racines des cannelures déterminent une structure de triangles dans lesquels les apex des coins cubiques se trouvent à des distances du centroïde respectif de leur triangle qui sont sensiblement inférieures à la distance entre l'orthocentre du triangle et son centroïde. Dans un parement de rétroréflecteur prismatique non métallisé, le réseau de coins cubiques presque triangulaires possède les avantages angulaires d'entrée de biseau composé avec presque l'efficacité des coins cubiques triangulaires non biseautés à de petits angles.

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