Lamp shade with improved optical efficiency

Details Lamp shade with improved optical efficiency Lamp shade with improved optical efficiency

1988-10-17

1991-01-22

Husar, Stephen F.

Illumination

Light modifier

Translucent or opaque

362356, 362361, F21V 1100

Patent

active

049875248

ABSTRACT:
A lamp shade is provided in the form of a translucent material in a generally tubular shape disposed about the vertical axis of a light source. The shade has an optical transmittance in the horizontal plane passing through the centroid of the light source, and a greater optical transmittance through the portion of the shade extending below the horizontal plane. A preferred embodiment controls the optical transmittance providing variable reflectance on the inner surface of the shade, and includes a generally reflective upper end closure having a means for supporting the shade, and a generally reflective convex cone below the light source.

REFERENCES:
patent: 589489 (1897-09-01), Wolff
patent: 2714155 (1955-07-01), Johnson
patent: 3308290 (1967-03-01), Brown
patent: 4410932 (1983-10-01), Oster
patent: 4463410 (1984-07-01), Mori

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