H - Electricity – 01 – H
Patent
H - Electricity
01
H
340/124, 340/187
H01H 13/52 (2006.01) H01H 13/702 (2006.01)
Patent
CA 1065260
ABSTRACT OF THE DISCLOSURE Membrane keyboard apparatus is disclosed including an insulator having a conductive sheet thereon providing a plurality of first electrode members in the form of an array of apertures, and a plurality of second electrode members located concentrically within and spaced from the periphery of the apertures of the first electrodes to form an array of individual switching units. The height of the conductive sheet is greater than the height of the second electrode members whereby the level of the top sur- faces of the plurality of first electrode members is vertically spaced above the level of the top surfaces of the second electrode members. A flexible, conductive member is disposed in a spaced relation above and adjacent to the level of the top surfaces of the pluralities of first and second electrode members. An identification member having an array of indicia corresponding to the array of individual switching units is disposed in a spaced relation above and adjacent to the flexible conductor. A threshold member is included in the form of an array of elastic bubble mem- bers corresponding to the array of individual switching units and including air escape means for the bubble members to avoid problems with trapped air. The bubble members are actuable by the touch which causes the selected bubble member to be deflected into the flexible conductive member to provide a conductive path between the associated first and second electrode members of the underlying switching units.
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