Heatable Laminated Side Pane Busbar Positioning
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Solution Overview
Problem
Heatable laminated side panes in motor vehicles face aesthetic issues due to visible busbars, require complex insulating measures to prevent short circuits, and suffer from uneven heating and potential hotspots with meandering wire routing along the lower edge.
Innovation Solution
Arranging busbars along the front or rear edges of the side pane, where they remain hidden from view, and routing heating wires without sharp bends to ensure aesthetic appeal and even heat distribution, with insulating measures to prevent short circuits and air penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If busbars are arranged along the lower edge of the side pane, then the electrical contacting remains hidden, but the busbars become visible when the side window is opened, creating aesthetic issues
Solution Approach 1:
The busbars are relocated from the lower edge to the side edges (front or rear edges) of the side pane, changing their positional dimension. This allows them to remain hidden when the window is opened while still maintaining electrical functionality, resolving the contradiction between aesthetic appearance and reliability of electrical contacting.
2Illumination intensity
If busbars are arranged along the front or rear edges, then aesthetic appearance is improved, but insulating measures become more complex to prevent short circuits
Solution Approach 1:
The patent applies different insulating measures at different locations: the thermoplastic intermediate layer provides insulation where heating wires contact the busbars, while additional insulating layers are applied only in regions where short circuit risks exist. This localized approach maintains aesthetic appearance while managing insulating complexity efficiently.
3Temperature
If heating wires are routed meanderingly from the lower edge, then the entire pane surface is heated, but sharp local bends create hotspots and aesthetic issues
Solution Approach 1:
Instead of routing heating wires from the lower edge (conventional approach), the patent inverts the routing strategy by starting from the side edges where busbars are located. The heating wires extend horizontally across the pane from side to side, eliminating sharp bends and hotspots while maintaining even heat distribution across the entire pane surface.
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 provides an aesthetically pleasing, efficiently heated side pane with reduced risk of hotspots and improved heat distribution, while maintaining the busbars' functionality and preventing air penetration.
Implementation Method 1
The heating wires run between the busbars such that a current can flow through the heating wires, by which means the heating action is obtained
Data Source
AI summary
A heatable laminated side pane for an openable side window of a vehicle is described. The side pane has an upper edge, a lower edge, a front edge, and a rear edge. The side pane also includes an outer pane and an inner pane, which are bonded to one another via a thermoplastic intermediate layer. The side pane also has at least one heating wire embedded in the intermediate layer. The heating wire runs between a first busbar and a second busbar and is electrically connected to the busbars, which are arranged along the front edge or the rear edge.