Patent ID: 7371985

Claim:
A watertight key switch assembly comprising: a flexible top layer made out of a polymeric material, said flexible top layer having at least one key cap and a conducting member respectively fixedly mounted on an inside wall of each of said at least one key cap; a flexible bottom layer made out of a polymeric material fastened to said flexible top layer and defining with said flexible top layer an accommodation space; a thin film circuit board set in the accommodation space between said flexible top layer and said flexible bottom layer and sealed to said flexible top layer and said flexible bottom layer with an adhesive, said thin film circuit board having at least one printed switch contact means corresponding to the conducting member in each of said at least one key cap for the contact of the associating conducting member to output a corresponding electric signal, and a cable electrically connected to said at least one printed switch contact means and extended out of one side of said flexible top layer and the corresponding side of said flexible bottom layer for connection to an external electronic device, wherein the watertight key switch assembly is configured to be stitched to fabric and to remain functional after being subjected to washing, drying, and folding.