Patent ID: 6355894
Filing Date: 2002-03-12
Classification: H01H

Abstract:
A keyboard comprising:a membrane switch sheet on which there are switch portions arranged in matrix form; tactile-response collapsible domes each provided with a dome part having therein a press part for driving a corresponding one of said switch portions and a flange part formed around a lower end portion of said dome part, said tactile-response collapsible domes being formed of an elastic rubber material and disposed on the membrane switch sheet in correspondence to said switch portions; an embossed sheet in which there are formed embossed cylindrical protrusions each for receiving said flange part of a corresponding one of the tactile-response collapsible domes, a top end portion of each of said embossed cylindrical protrusions being reduced in diameter for engagement with a top end portion of the corresponding flange part and said embossed sheet being placed on said membrane switch sheet; pantographic support frames each disposed on said embossed sheet astride a corresponding one of the tactile-response collapsible domes; and keytops each mounted on one of said pantographic support frames and elastically biased upward by a top of the corresponding one of the tactile-response collapsible domes.