Light-guide body and process for its production

Details Light-guide body and process for its production Light-guide body and process for its production

G - Physics

02

B

G02B 1/04 (2006.01) C08K 3/30 (2006.01) C08L 33/12 (2006.01) F21V 8/00 (2006.01)

Patent

CA 2466699

The present invention relates to a light-guide body, which has at least one light-entry surface and at least one light-exit surface, the ratio of the light-exit surface area to the light-entry surface area being at least 4, comprising at least one light-guiding layer with a thickness of at least 2 mm, characterized in that the light-guiding layer comprises at least 60% by weight, expressed in terms of the weight of the light-guiding layer, of polymethyl methacrylate and from 0.001 to 0.08% by weight, expressed in terms of the weight of the light- guiding layer, of spherical barium sulphate particles with an average diameter in the range of from 0.3 to 20 µm.

L'invention concerne un élément de guidage de lumière comportant au moins une surface d'entrée de lumière et au moins une surface de sortie de lumière, le rapport entre les surfaces d'entrée et de sortie de lumière étant d'au moins 4. Cet élément de guidage de lumière comprend au moins une couche de guidage de lumière d'au moins 2 mm d'épaisseur. L'invention est caractérisée en ce que la couche de guidage de lumière compte, relativement à son propre poids, au moins 60 % en poids de polyméthylméthacrylate et 0,001 à 0,08 % en poids de particules sphériques de sulfate de baryum, lesquelles ont un diamètre moyen entre 0,3 et 20 µm.

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