Patent ID: 6585435
Filing Date: 2003-07-01
Classification: H01H

Abstract:
An improved membrane keyboard, comprising:a bottom layer; a first conductive membrane layer having a first conductive circuit formed thereon; a second conductive membrane layer located above the bottom layer and having a second conductive circuit formed thereon and an output section extended from one end thereof at a selected location linked to an interrupt device configured for outputting interrupt commands; an insulation layer located above the second conductive membrane layer having a plurality of through openings formed therein; the first conductive membrane layer is located above the insulation layer; a top layer located above the first conductive membrane layer, said top layer having a plurality of jutting stubs located thereunder and a jutting section extended from one end thereof, the top layer being bonded to the bottom layer and forming an opening end at the jutting section; a button key layer located between the first conductive membrane layer and the top layer, said top layer having flat button key clusters corresponding to the jutting stubs of the top layer configured for entering input commands; and wherein the membrane keyboard is light weight and is allowed to wind in a roll to become a compact size for carrying, the button key layer being insertable through the opening end between the top layer and the first conductive membrane layer, and the button key clusters on the button key layer being durable for depressive operation under an external force for a long period of time without loosening.