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US 4,598,181 AGranted
Laminate switch assembly having improved tactile feel and improved reliability of operation
AssigneeGTE Communication Systems Corporation
InventorSteve F. Selby
Life of this patent
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Abstract
A laminate switch assembly comprising dual dome switchplates providing improved tactile sensation good balance characteristics and able to maintain a low dynamic resistance throughout its life expectancy. Both tensioned domes are aligned with electrical contact areas part of which is formed on the underside of one dome and the other on a printed circuit board or backplate, which in response to depression are placed in contact with each other to provide a switch closure to a connected or associated electrical device.
Claims1
A laminate switch assembly comprising:
- a printed circuit board including a recessed portion and having at least one electrical contact area formed thereon;
- a first switch plate having a tensioned dome aligned with said electrical contact area on said circuit board;
- a second switch plate having a tensioned tactile dome positioned over said tensioned dome of said first dome switch plate;
- said first and said second switch plates formed of a thermal plastic material;
- said domes on said first and second switch plates both arched in an upward direction;
- said tensioned tactile dome arched substantially higher than said tensioned dome;
- said tactile dome contacting said tensioned dome when depressed;
- and contact means comprising an electrically conductive coating on the interior surface of said tensioned dome, interposed between said circuit board and said first switch plate for providing an electrical connection to said contact area responsive to depression of said tactile dome.
5 more elements
Dependencies are inferred from the claim text.