Means and method for controlling the uplighting properties of a

Details Means and method for controlling the uplighting properties of a Means and method for controlling the uplighting properties of a

1990-02-20

1991-07-30

Lazarus, Ira S.

Illumination

Light modifier

Reflector

362296, 362337, 362376, 428325, F21V 722, F21V 502

Patent

active

050364456

ABSTRACT:
This luminaire has a reflector of substantially transparent material that is adapted to surround a light source. The reflector has many double-reflector right-angle prisms on its outer surface, each characterized by having two reflecting surfaces disposed to effect total internal reflection of a large percentage of the light from the source entering the prism. For controlling the amount of light passing from the source through the prismatic outer surfaces of the reflector, an additive in particle form is dispersed within the transparent reflector material and serves to divert some of the light rays entering the prisms into paths that intersect the reflecting surfaces at angles less than the critical angle of incidence, thereby causing said diverted rays to pass through the prismatic outer surface.

REFERENCES:
patent: 1259493 (1918-03-01), Dorey
patent: 1758977 (1930-05-01), Rolph
patent: 2354048 (1944-07-01), Palmquist
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patent: 3705303 (1972-12-01), Willis et al.
patent: 4118763 (1978-10-01), Osteen
patent: 4432045 (1984-02-01), Merritt
patent: 4460945 (1984-07-01), Chan et al.
patent: 4808471 (1989-02-01), Grunzinger
patent: 4904525 (1990-02-01), Taniguchi et al.
patent: 4933227 (1990-06-01), Stewart

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