Lighting fixture employing a partially reflective partially...

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

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F21V 7/22 (2006.01) C08J 9/04 (2006.01)

Patent

CA 2398776

In brief, a lighting fixture (100) is provided. The lighting fixture (100) has both a transmitted and reflected light component employing a polymeric material (114) which has an appearance, in varying degrees, of white. The material (114) has internal elements which can be varied to be either highly reflective or permit efficient diffuse transmission of incident light rays. The ratio of reflected to transmitted light and the degree of diffusion are tailored to the application, light source and desired appearance. The material (114) is adapted for providing a selected diffuse transmission component of a total fixture output. The material (114) provides a set diffuse transmission component of greater than 1% and less than 25% where the material is formed by pigmenting a transparent material with a white pigment. The material provides a set diffuse transmission component of greater than 1% and less than 99% where the material is formed by a foamed polymeric material, by an expanded bead material, by blending transparent materials having different refractive indices, or by adding a filter to a polymeric material.

L'invention concerne un appareil d'éclairage (100). Cet appareil d'éclairage (100) comporte un composant d'émission de lumière et de réflexion de lumière utilisant une matière polymère (114) qui présente un aspect blanc à des degrés divers. Cette matière (114) comprend des éléments intérieurs qui peuvent être modifiés afin d'être hautement réfléchissants ou afin de permettre une transmission diffuse efficace des rayons de lumière incidents. Le rapport entre la lumière réfléchie et la lumière émise et le degré de diffusion sont fonction de l'application, la source de lumière et l'aspect recherché. Cette matière (114) est conçue pour constituer un composant choisi de transmission diffuse d'une sortie totale de l'appareil. En outre, cette matière (114) constitue un composant de transmission diffuse fixé supérieur à 1 % et inférieur à 25 %, cette matière étant constituée par pigmentation d'une matière transparente avec un pigment blanc. Cette matière constitue également un composant de transmission diffuse fixé supérieur à 1 % et inférieur à 99 %, cette matière étant constituée d'une matière polymère en mousse, d'une matière expansée sous forme de perles, par mélange de matières transparentes présentant des indices de réfraction différents ou par ajout d'un filtre à une matière polymère.

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