Multi-sided retroreflector

Details Multi-sided retroreflector Multi-sided retroreflector

1976-01-26

1978-02-28

Corbin, John K.

Road structure, process, or apparatus

Apparatus

Rotating drum, roller or tire

350 97, 404 14, G02B 5124

Patent

active

040763838

ABSTRACT:
A multi-sided retroreflective body is disclosed having at least two retroreflective faces adapted to intercept light. Each reflective face is tilted in the same general direction about a lower portion angularly away from a vertical plane and is angularly related in a horizontal plane with respect to another vertical plane disposed substantially at right angles to the direction of such light. All four angles are so interrelated as to make the faces substantially optically equivalent, such that light retroreflected by the faces is directed in return paths substantially parallel to that of the intercepted light. Preferably, the reflective faces have light-reflecting units formed from three mutually perpendicular surfaces. In this case, a related advantage results in that all of the faces of the retroreflective body may be formed with the same forming tool without affecting their optical equivalence.

REFERENCES:
patent: 3332327 (1967-07-01), Heenan
patent: 3450459 (1969-06-01), Haggerty
patent: 3762825 (1973-10-01), Reusser
patent: 3799646 (1974-03-01), Footchkar
patent: 3883224 (1975-05-01), Tanaka
patent: 3954324 (1977-03-01), Arnott et al.

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