Reflex reflecting system for road surface marking

Details Reflex reflecting system for road surface marking Reflex reflecting system for road surface marking

1976-05-19

1977-09-20

Corbin, John K.

Road structure, process, or apparatus

Apparatus

Rotating drum, roller or tire

404 9, G02B 5128

Patent

active

040493377

ABSTRACT:
The disclosure describes, in the upwardly facing surface of a layer of material forming a traffic-regulating indicium on a road pavement, a reflective system consisting of a plurality of reflex-reflective aggregates consisting each of a main element of polymeric transparent material, partially embedded in said layer and having a convex portion projecting upwardly of said surface and having an index of refraction such that rays impinging said exposed portion at large angles of incidence are at least partially refracted into said element, said each aggregate further comprising a transparent binder substance contacting other portions of said element, said each aggregate still further comprising a monolayer of transparent beads contacting the and partially embedded into said transparent binder, having part-spherical surfaces facing away from said other portions of said element and a reflective coating provided over said part-spherical surfaces, the index of refraction n.sub.1 of said main element being from 1.45 and 1.68, the index of refraction n.sub.3 of said beads being from 1.60 and 1.95, and the ratio n.sub.3
.sub.2 of the index of refraction of said beads and of said binder being from 1.135 to 1.385, the total transparency efficiency of the system being greater than 0.1 when said exposed portion are impinged by light rays not less than 80.degree. .

REFERENCES:
patent: 3964821 (1976-06-01), Eigenmann

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