Intermediate screen for a signal light

Details Intermediate screen for a signal light Intermediate screen for a signal light

1991-03-28

1992-11-10

Husar, Stephen F.

Illumination

Light modifier

Refractor

362 61, 362309, 362333, 362339, F21V 500

Patent

active

051618850

ABSTRACT:
The invention provides an intermediate screen for a signal light, the screen being of the type constituted by a plate for passing a flux of light, and including a set of light-deflecting grooves on at least one of its faces, the grooves being essentially concentric and each being defined by two faces of essentially rectilinear profile and of given angles of inclination relative to the normal to the plate. For at least one subset of adjacent grooves, the angles of inclination of the faces defining each groove vary from one groove to another and are such that the sum of said angles is constant.

REFERENCES:
patent: 1787443 (1931-01-01), Falge
patent: 3798444 (1974-03-01), Brudy
patent: 4823246 (1989-04-01), Dilouya
patent: 4972302 (1990-11-01), Masuyama et al.

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