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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
Document File: 2 page(s) / 59K

Publishing Venue

IBM

Related People

Miles, AW: AUTHOR [+2]

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.

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Single-Piece Molded Programming Switch

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. This is provided by conductive molded actuators 3 that are supported on an integrally molded "living hinge" of plastic material affixed firmly to the base of the molding 7. Integral snap tabs 5 on the actuator 3 can be press fitted into the grooves 6 within the channel area for each actuator 3. One of the actuators is shown in an unactuated position, and the other is shown in the off position. If, instead of capacitive pads 2, diaphragm switches with electrical contacts were used, the actuator 3 would have a projection for actuating the contacts 2 when cover 8 is closed. Cover 8 is also affixed by integrally molded living hinges to the base 7. Cover 8 may in...