Electronic keyboard with luminous keys

Details Electronic keyboard with luminous keys Electronic keyboard with luminous keys

H - Electricity

01

H

H01H 13/70 (2006.01)

Patent

CA 2354160

The invention concerns electronic keyboards, in particular those used in dark surroundings and which therefore require that the keys are illuminated. The keyboard comprises a rigid printed circuit (10) whereon are soldered switches (20) capable of being indirectly actuated by the user's finger, each switch being topped with a key (30) at least partly transparent and illuminating means being provided for lighting up the key from the rear. The invention is characterised in that a pliable printed circuit (50), bearing conductors powering the electroluminescent diodes, is interposed between the keys (30) and the rigid printed circuit (10) bearing the switches; the pliable printed circuit comprises a rigid part (54) between a key and the corresponding switch, and the electroluminescent diode (60) which is to illuminate each key from the rear is soldered on the pliable printed circuit rigid part, between the key and the switch. The key preferably comprises a cavity wherein is housed the diode. The key presses on the switch via the rigid part (54) without pressing on the diode.

L'invention concerne les claviers électroniques, notamment ceux qui doivent être utilisés en environnement sombre et qui nécessitent de ce fait un éclairage des touches. Le clavier comporte un circuit imprimé rigide (10) sur lequel sont soudés des interrupteurs (20) pouvant être actionnés indirectement par le doigt de l'utilisateur, chaque interrupteur étant surmonté d'une touche (30) au moins en partie transparente et un moyen d'éclairage étant prévu pour éclairer la touche par l'arrière de celle-ci. Selon l'invention, un circuit imprimé souple (50), portant des conducteurs d'alimentation de diodes électroluminescentes, est intercalé entre les touches (30) et le circuit imprimé rigide (10) portant les interrupteurs; le circuit imprimé souple comporte une partie rigide (54) entre une touche et l'interrupteur correspondant, et la diode électroluminescente (60) qui doit éclairer chaque touche par l'arrière est soudée sur la partie rigide du circuit imprimé souple, entre la touche et l'interrupteur. La touche comporte de préférence une cavité dans laquelle vient se loger la diode. La touche appuie sur l'interrupteur par l'intermédiaire de la partie rigide (54) sans appuyer sur la diode.

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