Method for making a resistor using resistive foil
AssigneeVishay Intertechnology, Inc.
InventorsGeorge V. Gerber, Anthony E. Troianello, Haim Goldberger
Life of this patent
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Abstract
A fast heat rise resistor comprising a substrate, a foil bridge on the surface of the substrate, the foil bridge having an elevated portion and a contact portion, the elevated portion above the substrate, the contact portion in contact with the substrate, a conductive layer attached to the contact portion of said foil bridge. The activation energy and/or response time is reduced as the foil bridge is suspended over the substrate. Another aspect of the invention include a method of manufacturing the foil bridge and application to autoignition vehicle airbags.
Claims6
A method of manufacturing a fast heat rise resistor comprising, taking a substrate having an upper surface,
- affixing a layer of film over a first portion of the upper surface of the substrate;
- leaving a second portion of the upper surface of the substrate exposed;
- applying a double layer of material over both the layer of film and the exposed second portion of the upper surface of substrate, the double layer of material comprising a lower layer of resistive foil in contact with the layer of film and the second portion of the upper surface of the substrate, and an upper layer of conductive material
- selectively etching away a first portion of the upper layer of conductive material and leaving a second portion of the upper layer of conductive material in place;
- selectively etching away a portion of the lower layer of resistive foil so as to leave a resistive foil trace of a certain width overlying the layer of film and exposed upwardly through the first etched away portion of the upper layer of conductive material.
Dependencies are inferred from the claim text.