Vehicle Glazing Busbar Crossover for Uniform Heating
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Solution Overview
Problem
Existing glazings for electric heating in vehicles suffer from uneven heat distribution due to insulating layers covering most of the busbar length, leading to hotspots and inefficient defrosting or demisting.
Innovation Solution
A glazing design featuring a crossover of first and second busbars adjacent to a deletion line, allowing current flow along most of the busbar length for uniform heating, and using deletion lines and zone boundaries to control heat distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulating layer covers most of the busbar length, then electrical isolation is improved, but heat distribution deteriorates causing hotspots
Solution Approach 1:
The busbar is segmented into multiple heating zones by deletion lines that divide the conductive coating into separate segments. Each segment can be independently controlled, allowing different temperature distributions across the glazing surface while maintaining electrical isolation through the insulating layer.
Solution Approach 2:
The insulating layer is applied selectively only where electrical isolation is needed (between adjacent busbars and at crossover points) rather than covering the entire busbar length. This localized insulation approach maintains uniform heat distribution in areas where the busbar should conduct heat while providing electrical isolation where required.
2Reliability
If current flows only through contact windows, then electrical isolation is improved, but defrosting speed deteriorates
Solution Approach 1:
The conductive coating is segmented into multiple heating zones by deletion lines, creating independent current paths. This segmentation allows current to flow through multiple parallel paths across the glazing surface, increasing the overall heating efficiency and defrosting speed while maintaining electrical isolation between zones.
Solution Approach 2:
The busbar is designed to provide continuous heating along its length by allowing current flow through the conductive coating in multiple zones simultaneously, rather than relying on discrete contact windows. This continuous heating action significantly improves defrosting speed while the insulating layer maintains electrical isolation where needed.
3Temperature
If deletion lines divide the conductive coating, then heat distribution is improved, but manufacturing complexity increases
Solution Approach 1:
The deletion lines are created using laser processing or chemical etching methods that directly modify the conductive coating material, replacing complex mechanical masking and removal processes. This substitution simplifies manufacturing while achieving precise heat zone segmentation for improved heat distribution.
Solution Approach 2:
The conductive coating properties are modified through controlled deletion processes that change the material parameters (conductivity, thickness) in specific patterns. By adjusting the deletion line dimensions, spacing, and depth, optimal heat distribution is achieved while maintaining a relatively simple manufacturing process.
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 glazing achieves improved heat distribution and faster defrosting or demisting compared to conventional designs, while reducing the number of components needed and meeting industrial test requirements.
Implementation Method 1
a conductive coating (2) arranged on a major surface of the glass sheet (1)... first and second busbars (5, 6) arranged spaced from each other and in electrical contact with at least part of the heating area (2')... current flows in a heated coating from the first busbar to the second busbar
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention concerns a glazing (10) for electric heating, comprising a glass sheet (1), a conductive coating (2) arranged on the glass sheet (1), a first deletion line (3) in the conductive coating (2) forming a heating area (2'), a second deletion line (4) having a contact with the first deletion line (3) and extending in the heating area (20, first and second busbars (5, 6) at least partly on the heating area (2') adjacent the first deletion line (3), and a crossover (7) of first and second busbars (5, 6) at the contact between first and second deletion lines (3, 4). The invention also concerns a method for manufacturing the glazing and use of the glazing, for example as a window of a vehicle.