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Long Life, Finger Acutated Elastic Diaphragm Switch Assembly

IP.com Disclosure Number: IPCOM000052648D
Original Publication Date: 1981-Jun-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Sebrosky, RA: AUTHOR [+2]

Abstract

This article relates to deformable electrical switches and, more partic relates to finger-actuated elastic diaphragm switch (EDS) assemblies. Present finger-actuated EDS assemblies cannot be designed for extremely long fatigue life and/or reliable operation because it is possible to kink or overstress a circuit line when it is deflected by a finger through a hole in the separator panel, causing intermittent and unreliable operation.

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Long Life, Finger Acutated Elastic Diaphragm Switch Assembly

This article relates to deformable electrical switches and, more partic relates to finger-actuated elastic diaphragm switch (EDS) assemblies. Present finger- actuated EDS assemblies cannot be designed for extremely long fatigue life and/or reliable operation because it is possible to kink or overstress a circuit line when it is deflected by a finger through a hole in the separator panel, causing intermittent and unreliable operation.

To overcome fatigue and reliability problems, a specially designed large hole separator plate along with a specially designed small hole finger-actuated plate are utilized with known conductor carrying flexible substrates. Fig. 1 shows an EDS assembly 1 which includes bottom and top flexible substrates 2 and 3, respectively, which carry conductors 4 and 5, respectively. A separator plate 6 disposed between substrates 2 and 3 contains a large hole 7 through which conductor 5 is moved to touch conductor 4 when a finger-actuated septum 8 in the plate engages conductor 5 and moves it until it touches conductor 4. Fig. 2, a cross sectional view of Fig. 1, shows the juxtaposition of the various elements when finger actuated septum 8 is depressed. This specially designed configuration prevents kinking, and insures long life at the fixed ends of circuit line 4 in top substrate 3 by deflecting the ends through a small angle.

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