Patent ID: 8258984

Claim:
A thin film keyboard comprising: a circuit unit including a circuit board, and a light-emitting component disposed on said circuit board; a light guide disposed on said circuit board and including a main body that has a top face, a bottom face facing said circuit board, and a light incident lateral face facing said light-emitting component, said main body further having a curved groove disposed between said top face and said bottom face of said main body; said curved groove extends through said top face of said main body of said light guide, said curved groove having a first curved refracting face that defines a convex-side zone and a concave-side zone in said main body; said bottom face of said main body is formed with a cavity that is in spatial communication with said curved groove, said cavity has an inner wall face, a portion of said inner wall face is a sunken curved face and defines a second curved refracting face connected to said first curved refracting face; a keyboard surface layer disposed on said top face of said main body of said light guide and having an upper surface provided with a plurality of press parts for pressing, wherein one of said press parts is disposed proximate to said concave-side zone; and said one of said press parts proximate to said curved groove is disposed above said cavity.