Glazing Heating Wire Waviness for Uniform Power Distribution
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Solution Overview
Problem
Existing electrically heatable glazings for vehicles, such as windshields, suffer from inhomogeneous heating power distribution due to communication windows, leading to thermal stresses and potential detachment of add-on parts.
Innovation Solution
The glazing features an electric heating field formed by heating wires with varying waviness, where the first heating wires in one region have greater waviness than the second heating wires in another region, ensuring a homogeneous heating power distribution across the heating field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If communication windows are introduced to improve electromagnetic radiation permeability, then data communication is enabled, but heating power distribution becomes inhomogeneous
Solution Approach 1:
The heating wires are designed with different waviness characteristics in different regions: in the communication window area, the heating wires have reduced waviness or are discontinuous to allow electromagnetic radiation passage, while in non-communication areas, the heating wires maintain normal waviness for effective heating. This local differentiation resolves the contradiction by allowing each region to have the quality it needs.
Solution Approach 2:
The heating field is segmented into communication window regions and non-communication regions, with each region having independently optimized heating wire configurations. This segmentation allows the system to simultaneously satisfy both electromagnetic radiation permeability requirements in communication zones and heating uniformity requirements in other zones.
2Ease of manufacture
If heating wires are made straight to reduce manufacturing complexity, then manufacturing is simplified, but heating power distribution becomes inhomogeneous
Solution Approach 1:
The waviness parameter of the heating wires is systematically varied across different regions of the glazing. By controlling the degree and pattern of waviness, the patent achieves homogeneous heating power distribution while maintaining relatively simple manufacturing processes. The waviness can be controlled during the wire laying process without requiring complex manufacturing steps.
3Power
If heating power is increased to compensate for communication window areas, then heating effectiveness is improved, but thermal stresses increase
Solution Approach 1:
Rather than uniformly increasing heating power across the entire glazing, the patent applies localized heating adjustments. In communication window areas where electromagnetic radiation permeability is needed, the heating wires are configured to provide just enough heating to prevent excessive temperature differences, while avoiding the high heating powers that would cause thermal stress. This local quality approach maintains heating effectiveness without generating harmful thermal stresses.
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
This approach achieves a uniform heating power per area across the entire heating field, reducing thermal stresses and allowing for the design of communication windows without thermal inhomogeneities.
Implementation Method 1
The electrical heating wires (7) are arranged on the at least one pane... The first heating wires (7.1) in the first heating field region (H1) and the second heating wires (7.2) in the second heating field region (H2) differ from one another in their waviness... such that a heating power per area in the first heating field region (H1) corresponds to a heating power per area in the second heating field region (H2)
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The present invention relates to a glazing (1) with an electric heating field (H1, H2), which comprises: - at least one pane (2, 3), - a first collecting conductor (5) and a second collecting conductor (6) provided for connection to a voltage source, which are connected to each other by electric heating wires (7) in such a way that an electric heating field (H1, H2) is formed between the two collecting conductors (5, 6), - at least one heating-wire-free zone (8) outside the heating field (H1, H2), wherein a first collecting conductor section (5.1) of the first collecting conductor (5) is guided around the heating-wire-free zone (8) in such a way that a shortest distance between the first collecting conductor section (5.1) and the second collecting conductor (6) is smaller than a shortest distance between at least one second collecting conductor section (5.2) of the first collecting conductor (5) and the second collecting conductor (6), first heating wires (7.1) extending from the first collecting conductor section (5.1) to the second collecting conductor (6) in a first heating field region (H1) and second heating wires (7.2) extending from the at least one second collecting conductor section (5.2) to the second collecting conductor (6) in a second heating field region (H2), wherein the heating wires (7.1, 7.2) have the following features i), ii) and/or iii): i) an electrical resistance of the first heating wires (7.1) is greater than an electrical resistance of the second heating wires (7.2), ii) a distance between immediately adjacent first heating wires (7.1) is greater than a distance between immediately adjacent second heating wires (7.2), iii) a waviness of the first heating wires (7.1) is greater than a waviness of the second heating wires (7.2), wherein features i), ii) and/or iii) are configured such that a heating power per area in the first heating field region (H1) corresponds to a heating power per area in the at least one second heating field region (H2).