A lighting fixture including two reflectors

F - Mech Eng,Light,Heat,Weapons – 21 – V

Patent

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Details

F21V 7/09 (2006.01) F21V 7/00 (2006.01)

Patent

CA 2479471

A luminaire optical system (10) for an indirect light source including a tubular lamp (12) having a longitudinal axis (22), a first reflector assembly (14) extending parallel to and radially spaced directly above said lamp and a second reflector assembly (16) parallel to and radially spaced from said lamp directly below the lamp. Each of the assemblies includes symmetrical reflectors (22; 24; 30; 32) joining in an apex (26; 34) directly below and above the lamp. The bottom reflector (16) further may include two segments (30a; 30b; 32a; 32b) on each reflecting surface, the segments marking a sharp change in reflecting angle. Most such luminaires will typically also include perforations to maintain useful light profiles. The luminaire according to the present configuration increases the lighting efficiency by minimising any reflections passing back into the tube and ensuring an even spread of light throughout an area being illuminated.

L'invention concerne un système optique de luminaire (10) destiné à une source de lumière indirecte et comprenant une lampe tubulaire (12) présentant un axe longitudinal (22), un premier ensemble de réflecteurs (14) se prolongeant de manière parallèle et radialement espacée par rapport à ladite lampe directement au-dessus de celle-ci, ainsi qu'un second ensemble de réflecteurs (16) se prolongeant de manière parallèle et radialement espacée par rapport à ladite lampe directement au-dessous de celle-ci. Chacun de ces ensembles comprend des réflecteurs symétriques (22, 24, 30, 32) se joignant au niveau d'un sommet (26, 34) directement au-dessous et au-dessus de la lampe. En outre, le réflecteur inférieur (16) peut comprendre deux segments (30a, 30b, 32a, 32b) sur chaque surface de réflexion, ces segments marquant un changement abrupt de l'angle de réflexion. Par ailleurs, la plupart de ces luminaires comprennent habituellement des perforations permettant de conserver des profils de lumière utile. Le luminaire de la présente invention permet d'augmenter l'efficacité d'éclairage par réduction des réflexions repassant dans le tube et par maintien d'une diffusion uniforme de la lumière à travers une zone éclairée.

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