CPC H05B 3/0004 (2013.01) [H05B 3/03 (2013.01); H05B 3/10 (2013.01); H05B 3/34 (2013.01); H05B 2203/007 (2013.01); H05B 2203/013 (2013.01); H05B 2203/016 (2013.01); H05B 2203/037 (2013.01)] | 20 Claims |
1. A spot heater, comprising:
a sheet of resistive heating material that comprises an area or areas of reduced cross-sectional area which are adapted to constrict current flow through the sheet of resistive heating material;
and an actuator for providing electrical current through the sheet; and
wherein the area or areas of reduced cross-sectional areas are formed by opposing notches in the resistive heating material wherein each of the opposing notches has a feature angle of between 5 and 60 degrees.
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