Road structure – process – or apparatus – Apparatus – Rotating drum – roller or tire
Patent
1975-05-19
1977-03-15
Corbin, John K.
Road structure, process, or apparatus
Apparatus
Rotating drum, roller or tire
350105, 350175GN, 404 14, G20B 522
Patent
active
040121143
ABSTRACT:
There is described an optical system suitable for use on highway pavements or marking indicia for ensuring nighttime visibility, and consisting of a transparent sphere, a transparent layer of a binding medium having a refractive index different from that of the sphere, and partially surrounding said sphere, and a plurality of reflective part-spherical surfaces about such medium. The system has an optical transition zone between said sphere and said binding medium, consisting of a transparent layer of finite thickness wherein the index of refraction progressively varies from a value equal to that of the sphere, at locations adjacent to the sphere, to a value equal to that of said medium, at locations adjacent to the layer of said medium, whereby the refractive deviation of the light rays from the media (sphere and binding medium) having different refractive indexes occurs through said intermediate layer in form of a progressively curved path.
REFERENCES:
patent: 2713286 (1955-07-01), Taylor
patent: 3284722 (1966-11-01), Gray
patent: 3637285 (1972-01-01), Stewart
patent: 3781083 (1973-12-01), Eigenmann
Corbin John K.
DE LOS Reyes B. Wm.
Striker Michael J.
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