Retro-reflecting element and method

Details Retro-reflecting element and method Retro-reflecting element and method

1974-03-19

1976-06-22

Corbin, John K.

350105, G02B 5126

Patent

active

039648206

ABSTRACT:
There is described a retro-reflecting element of generally globular configuration adapted to retro-reflect a ray of light back along its own incident path, when impinged by grazing light on a part-spherical portion of its surface, bulging above the surface of a support layer wherein such element is partially embedded. The new element comprises an essentially optically homogeneous body forming said part-spherical portion and provided, on its remaining surface, with a plurality of closely spaced inwardly concave and reflective part-spherical small bowls capable of sending back, by multiple reflections totalling 180.degree., light rays impinging on said bulging part-spherical portion and refracted therethrough within said body towards any of said bowls. There is also described a method for making said element.

REFERENCES:
patent: 2294930 (1942-09-01), Palmquist
patent: 2951419 (1960-09-01), Lemelson
patent: 3556637 (1971-01-01), Palmquist
patent: 3781083 (1973-12-01), Eigenmann

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