Grid of lamellae for a lamp

Details Grid of lamellae for a lamp Grid of lamellae for a lamp

1987-12-24

1989-11-21

Lazarus, Ira S.

Illumination

Light source and modifier

Louvered or grid type modifier

362291, 362354, 362342, F21V 1106

Patent

active

048826626

ABSTRACT:
Interior lighting fixtures having specific shielding conditions. For lighting fixtures having a center-symmetrical light exit area, a structural pattern for a grid inserted into the light exit opening of the lighting fixture is provided which meets the specific shielding conditions of the BAP picture screen workstation condition and the like and which masks the light from the lighting fixture as little as possible. This structural pattern is based on a subdivision of the grid into segments of identical size having self-contained framing cells whose diagonal or whose largest, straight side or, respectively, a chord of the largest, arcuate side does not exceed a value 2 Ro of the diameter of the center grid cell. The size of the center grid cell thereby results from the height of lamellae exhibiting a double-parabolic cross-section while preserving the desired shielding condition for this center grid cell.

REFERENCES:
patent: 1894583 (1933-11-01), Ferree et al.
patent: 2143149 (1939-01-01), Guth
patent: 2166646 (1939-07-01), Sibbert
patent: 2398624 (1946-04-01), Decker
patent: 2572825 (1951-10-01), Guth
patent: 3076892 (1963-02-01), Stiffel
patent: 3508042 (1970-04-01), MacCoy
patent: 4222094 (1980-09-01), Wolar
patent: 4780800 (1988-10-01), Mullins
"Beleuchtung von Raumen mit Bildschirmarbeitsplatzen", Electrodienst22, 1980.

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