Retroreflector units with three mutually perpendicular surfaces

Details Retroreflector units with three mutually perpendicular surfaces Retroreflector units with three mutually perpendicular surfaces

1975-11-26

1978-02-14

Corbin, John K.

350102, G02B 5124

Patent

active

040735680

ABSTRACT:
A retroreflector of improved efficiency is disclosed comprising, in one form, a light-transmitting sheet adapted in use to be disposed in an angled position such that a normal to the sheet is at an angle of about 5.degree. to about 85.degree. from an incident beam of light. The sheet has front and back opposed, substantially parallel faces. The front face is substantially smooth and defines a light-refracting surface. The back face has a plurality of light-reflecting units. Each unit comprises three mutually perpendicular surfaces defining a trihedral angle of a rectangular parallelepiped and positioned with respect to the front face that the body diagonal of the rectangular parallelepiped is within an angle of 15.degree. of incident light refracted by the front face.

REFERENCES:
patent: 3332327 (1967-07-01), Heenan
patent: 3684348 (1972-08-01), Rowland
patent: 3758191 (1973-09-01), Hedgewick
Specification of Stimsonsite Product #88, Elastic Stop Nut Co. Eley, N.J., Nov. 11, 1964.

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