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US 4,400,758 AGranted
Capacitance switch arrangement
AssigneeW. H. Brady Co.
InventorNorman J. Frame
Life of this patent
Estimating the term…
Abstract
A capacitance-type membrane switch in which ordinarily spaced-apart contacts are positioned other than directly over an associated capacitance spacing element with an inner insulating layer and outer conductive portions.
Claims8
A capacitance switch comprising
- a substrate,
- a first conductive contact carried by said substrate,
- a flexible sheet extending over said substrate,
- a second conductive contact carried by said flexible sheet and aligned with and ordinarily spaced from said first contact,
- a capacitance spacing element carried by one of said substrate and said flexible sheet, located other than directly under or above said contacts,
- said capacitance spacing element comprising
- an inner insulating layer and
- outer conductive portions, one said conductive portion being electrically connected to one said contact, and
- first means for connection of the other said contact and the other said conductive portion to external circuitry,
- whereby said flexible sheet may be flexed to vary the spacing between said contacts to increase the capacitance of said switch.
7 more elements
Dependencies are inferred from the claim text.