Back to results
US 5,097,246 AGranted
Low amperage microfuse
AssigneeCooper Industries, Inc.
InventorsJames W. Cook, Terence J. Evans
Life of this patent
Estimating the term…
Abstract
A subminiature fuse includes a ceramic substrate with a glass coating disposed over a portion thereof. A fusing link is disposed on the glass coating, and weld pads for receiving fuse leads are disposed on opposite sides of the glass coating. The substrate, with leads attached, is encapsulated in plastic.
Claims16
A fuse subassembly comprising:
- an insulative substrate having a central portion disposed between opposed end portions;
- an insulating coating disposed on said central portion only terminating in opposed edges;
- a fuse element disposed on said insulating coating;
- a metallized lead attachment pad disposed on each of said opposed end portions and extending over the edge of said insulating coating and contacting said fuse element;
- an insulating coating with an average surface roughness limited to 25% of the thickness of the fuse element disposed on said insulating coating, and surface dislocations limited to 10% of the thickness of the fuse element.
2 more elements
A fuse comprising;
- a tube of insulating material;
- an insulative substrate disposed within said tube and having a central portion disposed between opposed end portions;
- an insulating coating disposed on said central portion only and having opposed edges;
- a fuse element having a thickness of less than 100 micro-inches disposed on said insulating coating;
- a metallized lead attachment pad disposed on each of said opposed end portions and extending over the edge of said insulating coating and contacting said fuse element;
- and
- end caps that mate with the tube and make electrical contact to said lead attachment pads.
4 more elements
A fuse subassembly comprising:
- an insulative substrate having a central portion disposed between opposed end
- an insulating coating disposed on said insulative substrate;
- a thin film fuse element disposed on said insulating coating;
- at least one metallized lead attachment pad disposed on said substrate and in contact with said fuse element, a portion thereof in direct contact with said substrate;
- wherein said insulating coating has an average surface roughness equal to or less than twenty five percent of the thickness of said fuse element.
2 more elements
A fuse subassembly comprising:
- an insulative substrate having a central portion disposed between opposed end portions;
- an insulating coating disposed on said insulative substrate;
- a thin film fuse element disposed on said insulating coating;
- at least one metallized lead attachment pad disposed on said substrate and in contact with said fuse element, a portion thereof in direct contact with said substrate;
- wherein the surface dislocations on said insulating coating are limited to ten percent of the thickness of said fuse element.
2 more elements
A fuse subassembly comprising:
- an insulative substrate having a central portion disposed between opposed end portions;
- an insulating coating disposed on said insulative substrate;
- a fuse element having a thickness of less than one hundred micro inches disposed on said insulating coating;
- at least one metallized lead attachment pad disposed on said substrate and in contact with said fuse element, a portion thereof in direct contact with said substrate;
- wherein said insulating coating has an average surface roughness equal to or less than twenty five percent of the thickness of said fuse element.
2 more elements
A fuse subassembly comprising:
- an insulative substrate having a central portion disposed between opposed end portions;
- an insulating coating disposed on said insulative substrate;
- a fuse element having a thickness of less than one hundred micro inches disposed on said insulating coating;
- at least one metallized lead attachment pad disposed on said substrate and in contact with said fuse element, a portion thereof in direct contact with said substrate;
- wherein the surface dislocations on said insulating coating are limited to ten percent of the thickness of said fuse element.
2 more elements
A fuse subassembly comprising:
- an insulative substrate having a central portion disposed between opposed end portions;
- an insulating coating disposed on said insulative substrate;
- a fuse element having a thickness of less than one hundred micro inches disposed on said insulating coating;
- at least one metallized lead attachment pad disposed on said substrate and in contact with said fuse element, a portion thereof in direct contact with said substrate;
- wherein said substrate is ceramic.
2 more elements
Dependencies are inferred from the claim text.