Pane having an electric heating layer

Abstract

A pane having an electric heating layer is described, including at least: a first pane having a first surface; at least one electric heating layer that is applied to at least part of the surface and has an uncoated zone; at least two busbars, provided for connection to a voltage source, which are connected to the electric heating layer such that a current path for a heating current is formed between the busbars; and at least one separating line which electrically subdivides the electric layer into at least two segments. At least one segment is arranged in the form of a strip around the uncoated zone such that the current path for the heating current is at least partially guided around the uncoated zone.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application is a continuation of U.S. patent application Ser. No. 14 / 653,843 filed on Jun. 18, 2015 which is the U.S. national stage of International Patent Application PCT / EP2013 / 073219 filed internationally on Nov. 7, 2013 which, in turn, claims priority to European Patent Application No. 12198362.1 filed on Dec. 20, 2012, the contents of each which are incorporated herein by reference in their entirety.FIELD[0002]The invention relates to a pane having an electric heating layer, a method for its production, and its use.BACKGROUND[0003]The field of vision of a motor vehicle window, in particular a windshield, must be kept free of ice and condensation. In the case of motor vehicles with an internal combustion engine, a stream of air heated by engine heat can, for example, be directed to the windows.[0004]Alternatively, the window can have an electrical heating function. Thus, composite glass panes that have a transparent, elec...

AI Technical Summary

Benefits of technology

[0007]Panes having an electric heating layer shield relatively strongly against electromagnetic radiation such that, in particular in motor vehicles with a heatable windshield, radio data traffic can be significantly impaired. Heatable windshields are, consequently, frequently provided with uncoated and thus coating-free zones (“communication windows”). The uncoated zones are readily permeable at least for specific ranges of the electromagnetic spectrum and, in this manner, enable trouble-free data traffic through the pane. The uncoated zones, on which electronic devices, such as sensors, cameras, and the like, are situated, are often arranged in the vicinity of the upper edge of the pane where they can be readily concealed by the upper masking strip.

Problems solved by technology

Panes having an electric heating layer shield relatively strongly against electromagnetic radiation such that, in particular in motor vehicles with a heatable windshield, radio data traffic can be significantly impaired.

However, uncoated zones negatively affect the electrical properties of the heating layer, which at least locally affects the current density distribution of the heating current flowing through the heating layer.

As a consequence, very high local pane temperatures which constitute a risk of burns can occur and impose high thermal stresses on the panes.

In addition, this can cause loosening of bonding sites of attachments.

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