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US 5,604,477 AGranted
Surface mount resistor and method for making same
AssigneeDale Electronics, Inc.
InventorsWalter Rainer, Joel J. Smejkal, Steve E. Hendricks, Gary E. Bougger
Life of this patent
Estimating the term…
Abstract
A surface mount resistor is formed by joining three strips of material together in edge to edge relation. The upper and lower strips are formed from copper and the center strip is formed from an electrically resistive material. The resistive material is coated with epoxy, and the upper and lower strips are coated with tin or solder. The strips may be moved in a continuous path and cut, calibrated, and separated for forming a plurality of electrical resistors.
Claims12
A method for making a surface mount resistor comprising:
- taking a first strip of electrically resistive material having an upper edge, a lower edge and first and second opposite faces, said first and second opposite faces being spaced apart a first thickness from one another;
- attaching a second strip of conductive metal to said upper edge of said first strip of resistive material;
- attaching a third strip of conductive metal to said lower edge of said first strip of resistive material;
- said second and third strips of conductive metal each having a thickness greater than said first thickness of said first strip of electrically resistive material;
- adjusting the resistance value of said first strip of resistive material by cutting a plurality of slots through said first strip of resistive material to form a serpentine current path;
- applying an electrically insulative encapsulating material only to said first strip of electrically resistive material so as to encapsulate said first strip of electrically resistive material within said encapsulating material;
- and
- coating said second and third strips of conductive material with solder.
5 more elements
A method for making a plurality of surface mount resistors comprising:
- taking an elongated first strip of electrically resistive material having first and second opposite ends, an upper edge, a lower edge, and first and second opposite faces spaced apart a first thickness from one another;
- attaching an elongated second strip of conductive metal to said upper edge of said strip of resistive material;
- attaching an elongated third strip of conductive metal to said lower edges of said strip of resistive material;
- sectioning said elongated first, second, and third strips into a plurality of separate body members after said second and third strips have been attached to said upper and lower edges respectively of said first strip;
- adjusting the resistance value of said resistive material in each of said plurality of body members by cutting a plurality of slots through said resistive material to create a serpentine current path in said resistive material of each of said body members;
- encapsulating said resistive material of each of said body members in a coating of electrically insulative material;
- and
- coating said second and third strips of conductive metal with solder.
5 more elements
A surface mount resistor comprising:
- an elongated first piece of electrically resistive material having first and second end edges, opposite side edges, a front face and a rear face, said piece of resistive material having a thickness between said front and rear faces and having a plurality of slots formed therein which create a serpentine current path for current moving between said first and second end edges;
- second and third pieces of conductive metal each having a front face, a rear face, an edge and a thickness between said front and rear faces thereof;
- a portion of each of the edges of said second and third pieces being attached to said first and second end edges respectively of said first piece;
- said thickness of said second and third pieces being greater than said thickness of said first piece;
- a dielectric material surrounding and encapsulating only said first piece;
- a coating of solder surrounding and coating said second and third pieces.
3 more elements
Dependencies are inferred from the claim text.