Patent CA-2955702-A1 (CA)
Title: Transparent pane having an electrical heating layer, method for its production, and its use
Inventor: SCHALL GUNTHER
IPC: H05B3/84
Filed: 2015-06-26
Abstract: The invention relates to a transparent pane (1), comprising at least one heatable, electrically conductive coating (8), which is connected to at least two collection electrodes (11, 11'), which are provided for electrically connecting to the two poles of a voltage source, in such a way that, by applying a supply voltage, a heating current flows across a heating field (12) formed between the at least two collection electrodes, the heating field (12) having at least one communication window (14) free from the heatable, electrically conductive coating (8), the heatable, electrically conductive coating (8) being bounded by a peripheral coating edge (10) and a peripheral edge strip (9), which is free from the electrically conductive coating (8) and extends to the peripheral pane edge (5), characterized in that the transparent pane (1) has, outside of the heating field (12) and spatially separated therefrom by a collection electrode (11 or 11') and along a first side (6 or 6') of the pane edge (5), at least one heatable, electrically conductive coating (8' or 8'''), at least one additional electrode (18, 18') being arranged in the region of each of the two sides (7, 7') of the pane edge (5), which at least one additional electrode is connected to a collection electrode (11 or 11') by means of at least one current supply line (15, 15') in each case, which at least one current supply line extends along the associated coating edge (10) and along the two second sides (7, 7') of the pane edge (5) at least in some segments in the associated edge strip (9), on the associated partial piece of the peripheral coating edge (10), electrically decoupled from the heating field (12) by at least one associated coating-free line (16 or 16') in each case, and/or in and/or on the associated electrically conductive coating (8'') outside of the heating field (12), electrically decoupled from the heating field (12) by at least one associated coating-free line (16 or 16') in each case, and the transparent pane contains in the electrically conductive coating (8' or 8''') at least one connecting conductor (19), which is electrically associated with the at least one additional electrode (18) and (18') and which is electrically connected to the collection electrode (11) or (11') of opposite polarity by means of the electrically conductive coating (8' or 8'''), and at least two systems (16") of at least four coating-free lines each, said systems lying opposite each other as a mirror image of each other with respect to the vertical center line and the mirror axis (M) of the transparent pane (1), said lines being arranged in such a way that said lines direct the heating current, which flows from at least two additional electrodes (18, 18') when a supply voltage is applied, over at least two current paths (a1, a2 to an) and via the at least two connecting conductors (19) associated therewith to the at least one collection electrode (11) or (11') of opposite polarity, equation I: VH1 = h1: bn = 0.5 to 2.0 (I) applying to the current paths (a1, a2 to an) in a system (16"), n standing for an integer from 2 to 30, (a1) designating the length of the current path from the additional electrode (18) to the closest opposite segment of the connecting conductor (19), (h1) standing for the height of the current path a1, (a2 an) designating the length of the further current paths, bn standing for the width of a further current path an, and (VH1) standing for the mathematical relationship (h1:bn).