Positive temperature coefficient heater

Details Positive temperature coefficient heater Positive temperature coefficient heater

1988-08-16

1989-08-15

Pellinen, A. D.

Electric heating

Heating devices

With heating unit structure

219203, 219219, H05B 100

Patent

active

048577111

ABSTRACT:
A self regulating heating device for a mirror is disclosed including a substrate having an electrical buss system deposited on one surface including a plurality of interdigitated electrodes and two buss bars. Stripes of positive temperature coefficient resistive material are printed perpendicularly over the buss system to form a plurality of heater areas and exposed substrate areas. A first adhesive layer is deposited over the resistive layer and adheres to the exposed areas of the substrate. An electrical barrier layer is secured to the first adhesive layer and a removable protective covering is secured by the second adhesive layer. The buss bars are tapered such that the power density at any point along their length is substantially equal to the average power density of the heater areas.

REFERENCES:
patent: 3790748 (1974-02-01), VanLaethem
patent: 3887788 (1975-06-01), Seibel
patent: 4037286 (1977-07-01), Medearis

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