Patent ID: 8888305

Claim:
An illuminated keyboard, comprising: a light source for emitting a light beam; a key structure, wherein when said key structure is depressed, a key signal is correspondingly triggered; and a backlight membrane switch module disposed under said key structure for generating said key signal and transferring said light beam to said key structure, wherein said backlight membrane switch module comprises: a light guide plate located at a side of said light source for guiding said light beam, and comprising a first circuit layer; and a membrane switch circuit board disposed over said light guide plate, and comprising a light-shading part and a second circuit layer, wherein said light-shading part is extended downwardly to a position under said light guide plate so as to prevent said light beam from being leaked out through a lateral surface of said light guide plate, wherein when said key structure is depressed, said second circuit layer of said membrane switch circuit board and said first circuit layer of said light guide plate are contacted with each other, thereby generating said key signal.