Trapezoidal Pane Heating Region with Segmented Conductive Coating
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Solution Overview
Problem
Existing motor vehicle windshield panes with electrical heating regions exhibit inhomogeneous heating power distribution, leading to inefficient deicing and defogging, particularly in the region of the longer base, where heating power and temperature are lower.
Innovation Solution
A trapezoidal pane with an electrical heating region divided by thin separating lines, where the ratio of the lengths of the bases is optimized to achieve a more uniform current path and heating distribution, using an electrically conductive coating and collecting conductors connected to a voltage source to form a current path for heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the electrical heating region covers the entire surface of the pane, then the heating area is maximized, but the heating power distribution becomes inhomogeneous with lower power in the region of the longer base
Solution Approach 1:
The electrical heating region is segmented by introducing separating lines that divide the coating into distinct zones. These separating lines create electrically isolated regions that allow independent control of current paths, enabling more uniform heating power distribution across the entire pane surface while maintaining maximum heating area.
Solution Approach 2:
The separating lines are strategically positioned to create locally optimized current paths. By adjusting the density and position of separating lines in different regions of the pane, the heating power distribution is locally adjusted to compensate for the geometric differences between the longer and shorter bases, achieving uniform overall distribution.
2Manufacturing precision
If separating lines are introduced to improve heating uniformity, then heating power distribution becomes more homogeneous, but the visual appearance is impaired
Solution Approach 1:
The separating lines are implemented as extremely thin film structures that are electrically effective but optically minimal. By using thin-film technology for the separating lines, electrical isolation is achieved while minimizing visual impairment, allowing the lines to be barely visible or invisible to the human eye.
Solution Approach 2:
The width, material composition, and optical properties of the separating lines are optimized to change parameters such that they provide sufficient electrical isolation while minimizing optical impact. The separating lines are designed with specific thickness and material properties that create high electrical resistance but low optical absorption and scattering.
3Manufacturing precision
If the ratio of base lengths is optimized for uniform heating, then heating uniformity improves, but the design flexibility is reduced
Solution Approach 1:
The separating line configuration is made adaptable rather than fixed. The position, density, and pattern of separating lines can be dynamically adjusted based on the specific pane geometry and heating requirements. This allows the same basic design approach to be applied to various pane shapes and sizes while maintaining optimal heating uniformity.
Solution Approach 2:
Multiple geometric parameters of the heating region and separating lines are optimized simultaneously, including the ratio of base lengths, the spacing and width of separating lines, and the position of collecting conductors. This multi-parameter optimization approach allows adaptation to different pane configurations while achieving uniform heating distribution.
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 a more homogeneous heating power and temperature distribution across the pane, enhancing deicing and defogging performance while minimizing visual impairment and maintaining economic production costs.
Implementation Method 1
By means of an external voltage source, an electrical current, which heats the coating and, hence, the pane, can be guided through the electrically conductive coating
Data Source
AI summary
A pane with an electrical heating region is presented. The pane has a substantially trapezoidal first pane, an electrically conductive coating applied on part of a surface of the first pane, a substantially trapezoidal electrical heating region that is electrically divided from the electrically conductive coating by a separating line, and two collecting conductors connected to the electrically conductive coating in the electrical heating region.