Transparent pane with heatable coating

Abstract

A transparent pane having an electrically heatable coating and at least one coating-free zone that can be used, for example, as a communication window, is disclosed. The electrically heatable coating is connected to two collecting electrodes, such that a supply voltage applied to the electrodes generates a heating current that flows via a heating field formed between the collecting electrodes, the heating field containing the coating-free zone whose zone-edge is formed, at least in sections, by the heatable coating. Other implementation details include subdivision of one of the two collecting electrodes into separated subregions, each connected, via an electrical supply line, to an additional electrode. In one case, the electrical supply line runs, at least in sections, in the coating-free zone, in a coating-free edge strip, in a subregion of the coating outside the heating field, and/or in the zone-edge. Methods for producing the transparent pane are also disclosed.

1 .- 2 . (canceled) 
     
     
         3 . A transparent pane, comprising:
 at least one electrically heatable coating connected to at least two collecting electrodes configured to establish an electrical connection to two poles of a voltage source, so that an applied supply voltage of the voltage source causes a heating current to flow via a heating field formed between the two collecting electrodes,   wherein the heating field contains at least one coating-free zone bordered by a zone edge of the coating-free zone, the zone edge being formed, at least in sections, by the heatable coating,   wherein at least one of the two collecting electrodes is subdivided into at least two subregions separated from one another, and   wherein at least one electrical supply line, of at least two electrical supply lines, is guided from each of the at least two subregions to at least one additional electrode.   
     
     
         4 . The transparent pane according to  claim 3 , wherein the at least one additional electrode is subdivided into at least two subregions separated from one another, and wherein each of the at least two subregions is electrically connected to one end of a respective electrical supply line of the at least two electrical supply lines as well as to the heating field section of the heating field between the two collecting electrodes. 
     
     
         5 . The transparent pane according to  claim 3 , wherein the at least one additional electrode is electrically connected to ends of the at least two electrical supply lines and to a heating field section of the heating field between the two collecting electrodes. 
     
     
         6 . The transparent pane according to  claim 3 , wherein the at least one electrical supply line runs, at least in sections,
 i) in the at least one coating-free zone, and/or   ii) in a coating-free edge strip of the transparent pane, and/or   iii) in at least one subregion of the heatable coating outside the heating field, and/or   iv) at and/or in the zone edge of the at least one coating-free zone formed by the heatable coating.   
     
     
         7 . The transparent pane according to  claim 3 , wherein each of the at least two subregions of the at least one of the two collecting electrodes is electrically connected via at least one flat conductor to a voltage source. 
     
     
         8 . The transparent pane according to  claim 4 , wherein each of the at least two subregions of the at least one additional electrode is connected via at least one flat conductor to a common voltage source. 
     
     
         9 . The transparent pane according to  claim 3 , wherein the at least one additional electrode has at least two connection sections which extend into the heating field section of the heating field, between the at least one additional electrode and at least one collecting electrode of the two collecting electrodes. 
     
     
         10 . The transparent pane according to  claim 3 , wherein the at least one electrical supply line is arranged predominantly or entirely in a coating-free edge strip and/or a coating-free zone of the transparent pane. 
     
     
         11 . The transparent pane according to  claim 3 , wherein the at least two electrical supply lines are guided in sections through a respective one of at least two subregions of the heatable coating outside the heating field. 
     
     
         12 . The transparent pane according to  claim 3 , wherein the at least two electrical supply lines are guided in sections through an upper region of the coating-free zone in an installed state of the transparent pane. 
     
     
         13 . The transparent pane according to  claim 3 , wherein the at least two electrical supply lines extend in sections along lateral zone edges of the at least one coating-free zone in an installed state of the transparent pane. 
     
     
         14 . The transparent pane according to  claim 3 , wherein the at least one additional electrode extends along a lower zone edge in an installed state of the transparent pane. 
     
     
         15 . The transparent pane according to  claim 3 , wherein the at least two subregions are electrically conductively connected via at least one connecting part to at least one flat conductor adapted for connection to a voltage source, and wherein the at least one flat conductor and the at least one connecting part are electrically isolated from the at least two electrical supply lines. 
     
     
         16 . The transparent pane according to  claim 15 , wherein the at least two subregions are electrically conductively connected via a common connecting part to the flat conductor. 
     
     
         17 . The transparent pane according to  claim 15 , wherein electrical isolation between, the at least one flat conductor and the at least one connecting part, and the at least two electrical supply lines is accomplished by means of an electrically insulating layer. 
     
     
         18 . A method for producing a transparent pane, the method comprising:
 A) producing an electrically heatable coating;   B) producing at least one coating-free zone in the electrically heatable coating;   C) forming at least two collecting electrodes provided for connection to two terminals of a voltage source, the at least two collecting electrodes being electrically connected to the electrically heatable coating, wherein at least one of the two collecting electrodes is subdivided into at least two subregions separated from one another;   D) producing at least one additional electrode provided for electrically connecting to the at least two subregions separated from one another; and   E) producing at least two electrical supply lines which electrically connect the at least one additional electrode respectively to the at least two subregions separated from one another.   
     
     
         19 . The method according to  claim 18 , wherein the process steps C), D), and E) can be performed simultaneously using a screen printing method. 
     
     
         20 . The method according to  claim 18 , further comprising applying the transparent pane to a functional and/or decorative individual piece and as a built-in component in furniture, devices, buildings, and means of transportation. 
     
     
         21 . The method according to  claim 18 , wherein the process step D) further comprises subdividing the a least one additional electrode into at least two subregions separated from one another, wherein each of the at least two subregions is electrically connected to one end of a respective electrical supply line of the at least two electrical supply lines as well as to a heating field section of a heating field between the two collecting electrodes. 
     
     
         22 . The method according to  claim 18 , wherein at least one of the two electrical supply lines is produced running, at least in sections,
 in the at least one coating-free zone, and/or   in a coating-free edge strip of the transparent pane, and/or   in at least one subregion of the heatable coating outside a heating field, and/or at and/or in the zone edge of the at least one coating-free zone formed by the heatable coating.