Surface light source device

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

Patent

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Details

F21V 29/00 (2006.01) F21S 8/00 (2006.01) F21V 29/02 (2006.01) G02F 1/13357 (2006.01) G09F 9/00 (2006.01) G02F 1/133 (2006.01)

Patent

CA 2216509

As regards a surface light source device for use with back-light or the like of a transmissive display panel, the efficiency of the cooling structure for the device will be improved and dust and dirt will be prevented from adhering. The surface light source device has a housing, a diffuser panel, a reflective plate, lamps, and an electric circuit portion. The housing has a window portion located ahead, a base portion located behind and side portions forming a flat space by connecting the two. The diffuser panel is mounted to the window portion of the housing. The reflective plate is supported by the side portions and partitions the flat space into a closed space ahead and an open space behind to be interposed therebetween. The lamps are housed in the closed space, and are positioned right above the reflective plate and right under the diffuser panel to radiate light toward the diffuser panel. The electric circuit portion is housed in the open space, and is electrically connected to the lamps to light them up. On the side portions of the housing, there are formed openings, through which cooling air supplied from outside is introduced into the open space to diffuse heat accumulated within the housing.

Cette invention concerne un source lumineuse pour afficheur transmissif à éclairage par l'arrière caractérisée par une dissipation de chaleur améliorée et une propreté accrue du fait que la poussière et les saletés ne peuvent y adhérer. La source lumineuse comporte un boîtier, un panneau diffuseur, une plaque réflectorisée, des lampes et un circuit électrique. Le boîtier comporte une fenêtre à l'avant, un fond à l'arrière et des parois latérales plates raccordant les deux autres éléments. Le panneau diffuseur est monté sur la partie avant à fenêtre du boîtier. La plaque réflectorisée est fixée aux parois latérales et divise le boîtier en deux parties, une fermée à l'avant, et une ouverte à l'arrière. Les lampes sont logées dans la partie fermée, immédiatement au-dessus de la plaque réflectorisée et immédiatement sous la panneau diffuseur pour éclairer en direction du diffuseur. Le circuit électrique est logé dans la partie ouverte et raccordé aux lampes pour les alimenter. Les parois latérales du boîtier comportent des ouvertures pour la circulation d'air de refroidissement servant à dissiper la chaleur accumulée.

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