Side scattering polymer light guide and method of manufacture

G - Physics – 02 – B

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G02B 6/02 (2006.01) A47F 11/10 (2006.01) B29D 11/00 (2006.01) F21V 8/00 (2006.01) F25D 27/00 (2006.01) G02B 6/10 (2006.01) G09F 13/18 (2006.01)

Patent

CA 2486643

A side scattering light guide (10) for emitting light comprises a substantially transparent polymer core (12) surrounded by a transparent or translucent polymer cladding (14). The core (12) includes a light scattering additive (20) arranged to scatter light within the core so that at least some of the light passes through the cladding (14) to be emitted from the light guide (10). The light scattering additive (20) yields a high ratio of forward to backward scattering and is preferably in the form of diffuser particles. The type, density, concentration and/or refractive index of the light scattering additive may be selected to achieve the desired side scattering characteristics. A method of manufacturing the side scattering light guide (10) is also disclosed.

La présente invention concerne un guide de lumière (10) à dispersion latérale permettant d'émettre de la lumière. Ledit guide comprend une âme polymère (12) sensiblement transparente entourée d'une gaine polymère (14) transparente ou translucide. L'âme (12) comprend un additif (20) de dispersion de lumière conçu pour disperser la lumière dans l'âme de sorte qu'au moins une partie de la lumière passe à travers la gaine (14) pour être émise à partir du guide de lumière (10). L'additif de dispersion de lumière (20) permet d'obtenir un rapport élevé de dispersion de l'avant vers l'arrière et se présente de préférence sous la forme de particules diffusantes. Le type, la densité, la concentration et/ou l'indice de réfraction de l'additif de dispersion de lumière peuvent être sélectionnés pour obtenir les caractéristiques de dispersion latérales souhaitées. L'invention concerne également un procédé de fabrication du guide de lumière (10) à dispersion latérale.

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