Compact PTC resistance heater
AssigneeGTE Products Corporation
InventorDonald R. Hawkins
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Abstract
A compact resistor heater device is disclosed comprising a resistor body of ceramic material having a positive temperature coefficient of resistance and having electrically conductive elements disposed upon the resistor body for conducting current from one side of a power supply to one side of the resistor body. The resistor device is encapsulated with a coating of thermally conductive material. In an alternate embodiment of the resistor heater device, a thermally conductive member is disposed in thermally conductive relationship to said resistor body and serves as a heat sink to dissipate the heat generated by the resistor body substantially uniformly over a greater area.
Claims4
A compact resistor heater device having a particular operating temperature comprising:
- a resistor body of ceramic material having a positive temperature coefficient of resistance;
- electrically conductive means disposed upon said resistor body for conducting current from opposite sides of a power supply to opposite sides of said resistor body;
- a thermally conductive member formed of a sheet of metal disposed in thermally conductive relationship to said resistor body;
- and
- a coating of thermally conductive material substantially free of voids entirely covering said resistor body and thermally conductive member.
Dependencies are inferred from the claim text.