Importance

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Abstract

Localized heating of a window, such as a vehicle windshield or sidelight, is provided by dividing an optical coating that is electrically conductive into high and low heating zones. While the conductive coating covers substantially the entirety of the window, the coating is patterned to establish a preselected heating power density pattern. In one application, bus-to-bus dimensions are kept short and opposite polarity high heating zones are placed in a side-by-side relationship, so that the major portion of the window is left unheated and the bus connections may be placed along the same window edge. In another application, the bus-to-bus dimensions are significantly larger, but power concentration is provided by a pattern of isolation lines that narrow the dimensions of current flow through a zone in which heating is desired.

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First Claim