G - Physics – 02 – B
Patent
G - Physics
02
B
G02B 5/124 (2006.01) B29D 11/00 (2006.01)
Patent
CA 2312363
Retroreflective sheeting (10) for forming orientation free cones of reflected light encompassing a 0.5 degree angle of observation is formed of small metal backed cube corner prisms (14) in an array in which the size (P) of the prisms are in a range between 0.0005 to 0.003 inches (0.0127-0.0762 mm) on center. The array is formed by casting transparent plastic prisms in a mold formed by ruling three sets of grooves (24, 26, 28) which intersect at an angle. The grooves are spaced apart in the range of 0.0005 to 0.003 inches (0.0127-0.0762 mm) on center. Before or after formation, the prisms are coated with a reflective material (26) such as a metal.
La présente invention concerne un revêtement rétroréfléchissant (10) permettant de former des cônes de lumière réfléchie dépourvus d'orientation englobant un angle d'observation de 0,5 degrés. Ledit revêtement est formé de petits prismes en coins de cube garnis de métal (14) formant un champ dans lequel la taille (P) des prismes varie entre 0,0127 et 0,0762 mm de centre à centre. On constitue le champ en coulant des prismes en plastique transparent dans un moule que l'on forme en réglant trois ensembles de rainures (24, 26, 28) qui se croisent selon un angle. Les rainures sont éloignées d'une distance de 0,0127 à 0,0762 mm de centre à centre. Avant ou après leur formation, on revêt les prismes d'un matériau réfléchissant (26) tel que du métal.
Nilsen Robert B.
Rowland William P.
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
Reflexite Corporation
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