Patent ID: 6388219
Filing Date: 2002-05-14
Classification: H01H

Abstract:
A key device comprising:a rigid printed circuit board comprising a first conductive end formed on an upper surface of the rigid printed circuit board; a flexible printed circuit board fixed over the rigid printed circuit board, the flexible printed circuit board comprising a second conductive end formed on a bottom surface of the flexible printed circuit board and positioned above the first conductive end; a decoder formed on the rigid printed circuit board, the decoder electrically connected to the first conductive end and to the second conductive end, the decoder producing a corresponding key signal when it detects the first conductive end touching the second conductive end, an isolation layer disposed between the rigid printed circuit board and the flexible printed circuit board, the isolation layer defining a gap between the first conductive end and the second conductive end; and a key structure fixed over the flexible printed circuit board, the key structure being moveable in an up and down manner for selectively pressing the second conductive end downwardly; wherein when the key structure is pushed downwardly, the key structure forces the second conductive end move downwardly to touch the first conductive end.