Metal working – Method of mechanical manufacture – Electrical device making
Patent
1982-09-20
1983-08-09
Hall, Carl E.
Metal working
Method of mechanical manufacture
Electrical device making
H01H 1100
Patent
active
043970826
ABSTRACT:
A membrane switch having a first flexible substrate segment with a pattern of conductive elements thereon at discrete coordinate locations and overlaying this substrate is a spacer layer having a plurality of apertures arranged on the same center-to-center spacing as the conductive elements on the spacer substrate. This spacer layer has the same general shape as the substrate but is of a smaller size so that when superposed on the substrate with the hole pattern aligned with the conductive elements, a border of the first substrate is exposed beyond the edges of the spacer member. Disposed atop the apertured spacer member is a further segment of flexible material also having a pattern of conductive elements at discrete coordinate locations corresponding to the coordinate locations of the conductive elements on the first substrate. When this further segment is superimposed upon the spacer layer, its conductive elements are aligned with the apertures in the spacer layer and face those on the first substrate. Again, the upper flexible layer has the same shape configuration as the bottom substrate and of the spacer member except that, again, the upper layer is of a lesser area than the other layers so that a border of the spacer layer extends outwardly beyond the edges of the uppermost layer. Completing the assembly is a sheet of flexible, non-conductive material on which is printed a pattern of desired graphic information. This graphics sheet has a pressure sensitive adhesive on its undersurface and when pressed against the exposed top layer, the adhesive serves to bond all three of the lower layers, one to the other to yield a generally impervious seal around the perimeter of the composite membrane switch assembly so as to preclude dust or moisture from entering the assembly.
REFERENCES:
patent: 3886012 (1975-05-01), Slater
patent: 3982081 (1976-09-01), Demler, Jr.
patent: 4085302 (1978-04-01), Zenk et al.
patent: 4096577 (1978-06-01), Ferber et al.
Echols P. W.
Hall Carl E.
Haugen Orrin M.
Nikolai Thomas J.
Sheldahl Inc.
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