Patent ID: 8810438

Claim:
A keyboard, comprising: a keycap comprising at least one light-pervious pattern; an emitting layer outputting lights towards the keycap; an elastic element arranged between the keycap and the emitting layer, and coupling to the keycap; and a membrane circuit board arranged between the elastic element and the emitting layer, and having a pressing region and at least one light-pervious region thereon, wherein the pressing region is aligned with the elastic element, and the light-pervious region is at least located at a vertical projection zone vertically projected on the membrane circuit board by the light-pervious pattern, and the membrane circuit board comprises: a plurality of light-pervious membranes stacked with each other; and at least one light-pervious adhesive layer sandwiched between every two neighboring light-pervious membranes, and fully filled in the light-pervious region.