Transparent Heating Element with Non-Heat Emission Lines
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Solution Overview
Problem
Existing heat-emitting glass technologies face challenges in achieving uniform heat emission and maintaining an unobstructed field of vision, particularly in vehicle applications, due to non-uniform hot wire patterns and varying distances between bus bars, which affect resistance and current distribution.
Innovation Solution
A heating element comprising a transparent substrate with bus bars, a heat-emitting pattern line electrically connected to the bus bars, and a non-heat-emitting pattern line not connected to the bus bars, arranged such that the non-heat-emitting lines are placed between the heat-emitting lines to ensure uniform heat distribution and visibility, with the bus bars not parallel to each other, allowing for intentional partitioning of heat-emitting areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If hot wires are arranged in a constant pattern according to the form of glass, then the structure is simple and easy to manufacture, but the distance between bus bars changes causing non-uniform resistance and non-uniform heat emission
Solution Approach 1:
The patent applies local quality by varying the thickness of hot wires in different regions. Specifically, the hot wire thickness is increased in areas where the distance between bus bars is larger, and decreased where the distance is smaller. This local adjustment compensates for the varying resistance caused by different bus bar distances, achieving uniform heat emission across the entire glass surface while maintaining the simple constant pattern arrangement.
2Temperature
If hot wire thickness is controlled to ensure uniform heat emission, then heat uniformity is improved, but the pattern distribution becomes non-uniform causing obstruction of field of vision
Solution Approach 1:
The patent changes the physical parameter of hot wire thickness to resolve the contradiction. By adjusting the thickness parameter locally across different regions, the patent achieves uniform heat emission (compensating for varying bus bar distances) while maintaining a visually uniform pattern distribution that does not obstruct the field of vision.
3Illumination intensity
If ITO sputtering is used to manufacture heat emitting glass, then transparency is improved, but sufficient heat emission is not achieved
Solution Approach 1:
The patent uses composite materials by combining transparent ITO (Indium Tin Oxide) layers with metallic hot wire patterns. The ITO layer provides the necessary transparency and baseline heat emission, while the overlaid hot wire patterns provide enhanced heating capability. This composite structure achieves both high transparency and sufficient heat emission capability that neither material could achieve alone.
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 enables uniform heat emission with minimal obstruction of the field of vision by maintaining a standard deviation of surface temperature at 20% or less, effectively addressing the issues of non-uniform heat distribution and pattern recognition.
Implementation Method 1
heat is generated by applying electricity, thereby increasing a temperature of the surface of glass
Data Source
Figure 1~2
Figure 3(a)~3(B)
Figure 4(a)~4(b)
AI summary
The present invention relates to a heating element including a transparent substrate, a bus bar, a power supply connected to the bus bar, a heat emitting pattern line provided on the transparent substrate and electrically connected to the bus bar, and a non-heat emitting pattern line provided on the transparent substrate and not electrically connected to the bus bar, and a method for manufacturing the same.