Brightness equalizing light filter system

Details Brightness equalizing light filter system Brightness equalizing light filter system

1988-06-15

1989-05-23

Lazarus, Ira S.

Illumination

Elongated source light unit or support

With or including transparent or translucent member

362260, 362307, 362308, 362327, F21S 302, F21V 500

Patent

active

048335754

ABSTRACT:
The present invention provides a brightness equalizing light filter system which can be utilized as the bottom panel or as one of a set of bottom panels in an indirect fluorescent light fixture to evenly illuminate the fixture to approximately the same degree of brightness as the surrounding area which it lights. The brightness equalizing light filter system comprises a translucent diffuser panel with an opaque, electrically-connected pattern of thin metal film deposited thereon, wherein the density of the opaque pattern for each point on the panel is proportional to (or the linear function of) the intensity of light impinging on that point from the light source. The metal film serves both as the required electrical ground to act as a starting aid for the lamps and as a reflecting surface to increase the photometric efficiency of the fixture.

REFERENCES:
patent: 3230360 (1966-01-01), Short
patent: 3231663 (1966-01-01), Schwartz
patent: 3351753 (1967-11-01), Beroer
patent: 4568860 (1986-02-01), Feinberg et al.

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