Patent ID: 8586887

Claim:
A luminous keyboard, comprising: at least one light-emitting element for providing light beams to illuminate said luminous keyboard; a membrane circuit board comprising: an upper wiring board comprising a first film layer and a first circuit pattern formed on a bottom surface of said first film layer, wherein said first circuit pattern has a plurality of upper contacts; and a lower wiring board comprising a second film layer, a second circuit pattern and a light reflective element arranged on said second film layer, wherein said second film layer comprises a light-guiding film layer and said second circuit pattern is formed on said light reflective element and has a plurality of lower contacts corresponding to respective upper contacts, wherein each of said upper contacts and said corresponding lower contacts are separated from each other by a spacing interval, and each of said upper contacts and said corresponding lower contacts are collectively defined as a membrane switch, wherein said light-emitting element is located beside said membrane circuit board for emitting said light beams toward said membrane circuit board and a refractive index of said light reflective element is lower than a refractive index of said second film layer such that a great portion of the light beams are subject to total internal reflection in the light-guiding film layer; and a plurality of keys, wherein when said keys are triggered, respective membrane switches are conducted.