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2010-12-01T14:35:12+01:00
2010-10-25T00:17:15+01:00
2010-12-01T14:35:12+01:00
Jouve S.A., EPO - Publication - KB, TaggedPDF v1.27
EP-0490279-A2-19920617
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EP-0490279-A2-19920617
The light box (10) is provided with a case (12) having arranged therein a reflector (22) directed to the front wall (20) to be illuminated from the rear. The reflector surf ace (24) has a concave curvature. An elongated light source (26) is arranged in the center of the case (12). The reflector (22), in the central area thereof, is covered by an optical film (28) having a structured surface directed to the light source (26). This structure consists of immediately adjacent V-shaped grooves, being parallel to each other and running transverse to the extension of the light source (26). By total reflection on the structured surface of the transparent optical film (28) as well as by reflection on the reflector surface (24) of the reflector (22), the light of the light source (26) incident on the reflector (22) is reflected in the direction of the back-lit front side (21) of the light box (10). This arrangement provides for improved and more-uniform light distribution.
The light box (10) is provided with a case (12) having arranged therein a reflector (22) directed to the front wall (20) to be illuminated from the rear. The reflector surf ace (24) has a concave curvature. An elongated light source (26) is arranged in the center of the case (12). The reflector (22), in the central area thereof, is covered by an optical film (28) having a structured surface directed to the light source (26). This structure consists of immediately adjacent V-shaped grooves, being parallel to each other and running transverse to the extension of the light source (26). By total reflection on the structured surface of the transparent optical film (28) as well as by reflection on the reflector surface (24) of the reflector (22), the light of the light source (26) incident on the reflector (22) is reflected in the direction of the back-lit front side (21) of the light box (10). This arrangement provides for improved and more-uniform light distribution.
en
European Patent Office
EP0490279
EP 0490279
F21V 07/00
G09F 13/14
Light box
Light box - European Patent Office - EP 0490279 A2
Light box - European Patent Office - EP 0490279 A2
Adobe PDF Library 8.0
"EP0490279"; "EP 0490279"; "F21V 07/00"; "G09F 13/14"; "Light box"
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EP
0490279
A2
1992-06-17
91120925
1991-12-06
DE
4039291
1990-12-08
F21V 07/00
G09F 13/14
MINNESOTA MINING AND MANUFACTURING COMPANY
Simmons, Adrian
Carcia, Alberto de la Cruz
Casalone, Roberto
Hilleringmann, Jochen, Dipl.-Ing. et al
Light box
Leuchtkasten
Light box
Caisson lumineux
The light box (10) is provided with a case (12) having arranged therein a reflector (22) directed to the front wall (20) to be illuminated from the rear. The reflector surf ace (24) has a concave curvature. An elongated light source (26) is arranged in the center of the case (12). The reflector (22), in the central area thereof, is covered by an optical film (28) having a structured surface directed to the light source (26). This structure consists of immediately adjacent V-shaped grooves, being parallel to each other and running transverse to the extension of the light source (26). By total reflection on the structured surface of the transparent optical film (28) as well as by reflection on the reflector surface (24) of the reflector (22), the light of the light source (26) incident on the reflector (22) is reflected in the direction of the back-lit front side (21) of the light box (10). This arrangement provides for improved and more-uniform light distribution.
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