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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 posit

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.

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A heating device comprising: a planar electrically insulated substrate; an electrical buss system on one surface of said substrate, including a pair of buss bars and two electrode patterns having a plurality of spaced apart parallel interdigitated electrodes, adjacent electrodes of said plurality of

A heating device comprising: a planar electrically insulated substrate; an electrical buss system on one surface of said substrate, including a pair of buss bars and two electrode patterns having a plurality of spaced apart parallel interdigitated electrodes, adjacent electrodes of said plurality of interdigitated electrodes connected to different ones of said pair of buss bars, each buss bar extending from one of a pair of terminal connection points along generally opposite portions of a peripheral edge of said substrate; a plurality of heater-lets formed of an electrically resistive layer of material having a positive temperature coefficient, said plurality of heater-lets having varying sizes and shapes being deposited over said electrical buss system between adjacent electrodes of said interdigitated electrodes. each of said plurality of heater-lets being separated from its neighbor by spaces of varying sizes and shapes so as to form a plurality of individual heating areas of variable intensity; and at least one adhesive layer being deposited over said electrically resistive layer including the spaces between said heater-lets, said adhesive layer contacting and bonding directly to said substrate in areas of said substrate between said heater-lets, whereby the power distribution over the entire substrate is selectively regulated by varying the density of the heater-lets.