Patent ID: 9219478
Filing Date: 2015-12-22
Classification: H03K

Abstract:
1. A circuit switch for keys of a keyboard, comprising: a first plate, on a surface of which a first sensitive portion and a second sensitive portion are mounted and superposed on each other, a first insulated portion being mounted between the first and second sensitive portions for electrically insulating the first and second sensitive portions against each other, a first conductive wire being located at the first plate and electrically connected with the first sensitive portion; a second plate, on a surface of which a conductive portion is mounted, the first and second plates being arranged in parallel, the conductive portion corresponding to the second sensitive portion in a way that they are spaced from each other, a second conductive wire being located at the second plate and electrically connected with the conductive portion; a grounded circuit mounted between the first and second plates and spaced from the second sensitive portion, the grounded circuit partially overlapping or crossing the first or second conductive wire; and a second insulated portion mounted to a top side of the second sensitive portion, the second insulated portion having a hollow portion for exposing a part of the second sensitive portion.