Patent ID: 7608792

Claim:
A membrane keyboard for a notebook computer, comprising: a frame board comprising a plurality of units each having a central aperture; a plurality of transparent keys each comprising a bottom press portion; a plurality of resilient bridge structures disposed on the frame board, each of the bridge structures being secured to the bottom of the corresponding key and comprising a central opening; a plurality of resilient insulative elastic members each comprising a downward stem and a top cup-shaped member; a film circuit board comprising a plurality of LEDs; a light guide film plate formed of transparent elastomeric material, the light guide film plate being fastened on the film circuit board and comprising a plurality of light diffusing areas on the bottom, each light diffusing area being disposed a predetermined distance under the corresponding key and having a plurality of cavities and a conductive member raised downward from a center of the cavities wherein the cavities are different in terms of depth, size, and density corresponding to different distances from the LEDs; and a base board with the film circuit board fastened thereon, wherein the elastic members are secured onto the light diffusing areas respectively and are inserted through the apertures and the openings with the cup-shaped members being securely put on the press portions so that the keys are adapted to light uniformly when the notebook computer is activated.