Transparent Panel Heatable Coating Uniform Heat Distribution
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Solution Overview
Problem
Heated windshields with electrically heated coatings often experience inhomogeneous heat output distribution due to coating-free zones, leading to hot spots and potential thermal stresses, which can impair radio data traffic and pose safety risks.
Innovation Solution
A transparent pane with an electrically heatable coating that includes a coating-free zone with a second electrode arranged within it, allowing for a more uniform current density distribution by adjusting the potential difference between the second electrode and the first electrode, thereby homogenizing the heating power distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a coating-free zone is created to enable electromagnetic transparency for radio data traffic, then electromagnetic signal transmission is improved, but the heat output distribution becomes inhomogeneous with hot spots and reduced heating efficiency
Solution Approach 1:
The patent applies different properties to different parts of the windshield: the coating-free zone maintains electromagnetic transparency while the surrounding heated zones provide thermal heating. The second electrode is specifically positioned within the coating-free zone to provide localized electrical connection, creating spatially varying functionality that addresses both communication and heating requirements simultaneously.
Solution Approach 2:
The second electrode acts as an intermediary element that bridges the coating-free zone and the heating layer. It provides electrical connection to the heating layer through the coating-free zone without compromising electromagnetic transparency, thereby mediating between the conflicting requirements of signal transmission and heat generation in that region.
2Object-affected harmful factors
If the heating layer is made opaque to block electromagnetic radiation, then shielding against electromagnetic radiation is improved, but radio data traffic is significantly impaired
Solution Approach 1:
The heating layer is designed with spatially varying properties: it is opaque in the heated zones to provide electromagnetic shielding while being transparent in the coating-free zone to allow radio signal transmission. This local differentiation of optical properties resolves the contradiction between shielding effectiveness and communication capability.
3Power
If the collecting electrodes are placed at the top and bottom edges to reduce current path length, then heating efficiency is improved, but the heat output distribution becomes inhomogeneous near coating-free zones
Solution Approach 1:
The patent divides the electrode system into multiple segments: first electrodes at the top and bottom edges for efficient current introduction, and a second electrode within the coating-free zone to segment and redistribute the current path. This segmentation breaks the inhomogeneous current flow into more uniform segments, addressing the distribution uniformity problem while maintaining overall heating efficiency.
Solution Approach 2:
The second electrode changes the electrical parameters (potential distribution, current density) in the coating-free zone region. By adjusting the electrical potential through the second electrode, the current density distribution is modified to achieve more uniform heating despite the presence of the coating-free zone and the edge-placed collecting electrodes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves a more uniform heat output distribution, reducing the risk of hot spots and thermal stresses while maintaining electromagnetic transparency, thus enhancing safety and functionality.
Implementation Method 1
The heat generated by the heating layer can remove condensed moisture, ice and snow in a short time
Implementation Method 2
Windshields with an electric heating layer provide a relatively strong shield against electromagnetic radiation
Data Source
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AI summary
The invention relates to a transparent panel having an electrically heatable coating, which is electrically connected to at least two first electrodes for electric connection to both poles of a voltage source such that, by applying a supply voltage, a heating current flows over a heating field formed between the two first electrodes. The heating field contains at least one coating-free zone which is delimited by a zone edge formed in at least some sections by the heatable coating. According to the invention, at least one second electrode for electric connection to the one pole of the voltage source is provided, which comprises at least one supply section disposed at least in some areas of the coating-free zone and one or several connection sections connected to the supply section, wherein the connection sections, starting from the coating-free zone, extend in each case beyond an edge section of the zone edge, wherein the edge section is formed by a section of the heating field which is located between the coating-free zone and the first electrode provided for connection to the other pole of the voltage source. The invention further relates to a method for producing such a panel.