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Single-Piece Molded Programming Switch

IP.com Disclosure Number: IPCOM000061512D
Original Publication Date: 1986-Aug-01
Included in the Prior Art Database: 2005-Mar-09

Publishing Venue

IBM

Related People

Authors:
Miles, AW Whittle, DJ [+details]

Abstract

Many machine designs utilize dual-in-line programmed rocker or selection switches available from a variety of sources. For capacitive keyboard technology, a single-piece molded programming switch has been designed that is of considerably lower cost and requires no assembly. Fig. 1 illustrates a partially cut-away pictorial view of several switch positions in the programming switch structure. A flexible circuit 1 containing capacitive circuit pads or, in the alternative, a flexible membrane switch containing contacts has contact areas 2 embedded within it, as shown. Assuming the contact areas are capacitive pads, it is necessary to bring a conductive surface into close proximity with both pads 2 to provide capacitive coupling that can be sensed via a normal keyboard scan.