Positive temperature coefficient heater with distributed heating

Details Positive temperature coefficient heater with distributed heating Positive temperature coefficient heater with distributed heating

1989-07-13

1990-06-05

Reynolds, Bruce A.

Electric heating

Heating devices

With heating unit structure

219203, 219219, 219543, 219553, H05B 100

Patent

active

049316273

ABSTRACT:
A heating device for a mirror includes a substrate having an electrical buss system deposited on one surface thereof including a plurality of interdigitated electrodes and two buss bars. There is provided a plurality of heater-lets formed of an electrically resistive layer of material having a positive temperature coefficient. The plurality of heater-lets have varying sizes and shapes and are deposited over the electrical buss system between the adjacent electrodes of the interdigitated electrodes. Each of the plurality of heater-lets are separated from its neighbor by spaces of varying sizes and shapes so as to form a plurality of individual heating areas of variable intensity. 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 second adhesive layer is disposed on the electrical insulated barrier layer. A removable protective covering is secured to the second adhesive layer. The power distribution over the entire substrate is selectively regulated by varying the density of the heater-lets.

REFERENCES:
patent: 3790748 (1974-02-01), Van Laethem
patent: 3887788 (1975-06-01), Seibel
patent: 4037286 (1977-07-01), Medearis
patent: 4628187 (1986-12-01), Sekiguchi
patent: 4631391 (1986-12-01), Tiepke

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