Browse Prior Art Database

Elastic Diaphragm Switch

IP.com Disclosure Number: IPCOM000073422D
Original Publication Date: 1970-Dec-01
Included in the Prior Art Database: 2005-Feb-22
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Geil, DS: AUTHOR [+2]

Abstract

Diaphragm type switches in general have been satisfactory but are subject to rupture of the elastic diaphragm and in the case of multiple pole switches, sometimes fail to close one of the contact sets. The switch shown gives substantially improved performance in these areas. The switch comprises a rigid substrate 1 on which is a layer of copper contacts 2. Above this is a separator sheet 3 having openings at each location where contacts are to be made. The next sheet 4 is a continuous diaphragm of a flexible plastic with a lower surface having a layer 5 of copper etched into contact surfaces and connecting leads. Above this is a relatively thick layer 6 of rubber and all of the layers are held in place by a rigid cover plate 7.

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Elastic Diaphragm Switch

Diaphragm type switches in general have been satisfactory but are subject to rupture of the elastic diaphragm and in the case of multiple pole switches, sometimes fail to close one of the contact sets. The switch shown gives substantially improved performance in these areas. The switch comprises a rigid substrate 1 on which is a layer of copper contacts 2. Above this is a separator sheet 3 having openings at each location where contacts are to be made. The next sheet 4 is a continuous diaphragm of a flexible plastic with a lower surface having a layer 5 of copper etched into contact surfaces and connecting leads. Above this is a relatively thick layer 6 of rubber and all of the layers are held in place by a rigid cover plate 7.

Cover plate 7 has an opening for each switch position and an actuator 8 is depressable through each opening to operate the switch.

The contact layer 2 is etched to provide contacts at each switch with connecting leads and is formed with an opening at each contact position. Similarly the contact layer 5 has a corresponding hole and also has the contact surface around each hole subdivided into four or more sectors to provide flexibility. The actuator 8 is formed with a rounded contacting surface and is smaller in diameter than the holes in contact layers 2 and 5. These holes are substantially smaller than the openings in the separator 3.

In operation, the rounded face 9 of actuator 8 prevents concentration of force a...