Heatable Pane Switch Region for Clear Vision and Uniform Heating
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Solution Overview
Problem
Existing electrically heatable vehicle windows struggle to integrate a switch region that is both economically viable and non-intrusive to vision, while maintaining uniform heating power distribution.
Innovation Solution
An electrically heatable pane with a switch region, featuring a transparent substrate, an electrically conductive layer divided by a separating line into heating and switch regions, with busbars connected for a heating current path, and a capacitive switch region integrated into the pane to minimize visual interference and ensure precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a switch region is integrated into the electrically heatable pane, then the control function is built-in and economical, but the switching function interferes with vision through the pane
Solution Approach 1:
The electrically conductive layer is divided into functionally separate regions: a heating region with busbars for thermal control and a switch region with contact areas for capacitive switching. The separating line electrically isolates these regions while maintaining visual continuity, allowing each zone to perform its specific function without interfering with the other or with vision through the pane.
2Manufacturing precision
If the electrically conductive layer is divided into heating and switch regions, then the heating power distribution remains uniform, but the separating line may interfere with vision
Solution Approach 1:
The separating line is designed with specific local characteristics: it has sufficient electrical resistance to isolate the heating and switch regions, but its optical properties (transparency, width, material composition) are optimized to minimize visual interference. This allows the line to perform its electrical function while remaining尽可能 invisible to maintain uniform heating appearance and vision quality.
3Ease of operation
If the feed line region is positioned perpendicular to the current path, then the contact region is accessible, but the heating power distribution becomes non-uniform
Solution Approach 1:
The feed line region is oriented along the longitudinal direction of the pane (parallel to the current path between busbars) rather than perpendicular to it. This dimensional arrangement allows the contact region to remain accessible at the edge of the pane while the separating line maintains a configuration that minimizes disruption to the uniform current distribution across the heating region, preserving both operability and heating uniformity.
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 allows for an economically integrated switch region that does not obstruct vision, provides uniform heating, and enables precise control of the heating function, preventing unintended activation from external sources.
Implementation Method 1
an electric current that heats the coating and, with it, the pane can be conducted through the electrically conductive coating
Implementation Method 2
When an object approaches the switch surface, the capacitance of the surface electrode changes against ground or the capacitance of the capacitor formed by the two coupled electrodes changes
Data Source
AI summary
An electrically heatable pane with a switch region is presented. The pane has a transparent substrate, with at least one transparent electrically conductive layer that is, at least partially, arranged on a surface of the pane. At least one separating line electrically divides the layer into a heating region and a switch region. At least two busbars are provided for connection to a voltage source. The busbars being connected to the heating region, form a current path between the busbars. A heating current can therefore flow through the current path. Furthermore, the switch region has at least one contact region, a feed line region, and a connection region, where the connection region can be connected to sensor electronics.