Planar Heating Structure for Vehicle Windshields
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Solution Overview
Problem
Existing defogging/defrosting technologies for vehicle windshields, such as those using metal wires, suffer from non-uniform heating, transparency issues, and slow heating times, leading to reliability and safety concerns due to incomplete attachment, temperature differentials, and high replacement costs.
Innovation Solution
A planar heating structure comprising a glass substrate layer, a nanometallic transparent conductive layer, and a passivation layer, which allows for uniform heating and rapid temperature increase, ensuring transparency and reliability by using silver nano materials and anti-UV layers to prevent corrosion and enhance optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If metal wires are distributed on window surfaces for heating, then the window glass temperature rises to resolve fog, but the metal wires block light and reduce visibility through the windows
Solution Approach 1:
The patent changes the physical parameters of the heating material from macro-scale metal wires to nano-scale transparent conductive particles. This parameter change allows the material to maintain electrical conductivity for heating while becoming transparent to visible light, thus resolving the contradiction between temperature rise and visibility.
Solution Approach 2:
The patent substitutes the traditional metal wire heating system with a transparent conductive coating system. This replacement eliminates the mechanical obstruction caused by visible metal wires while preserving the electrical heating function, thereby maintaining both defogging capability and window transparency.
2Power
If metal wires are attached to glass surfaces, then heating function is provided, but incomplete attachment causes non-uniform heating and reliability issues
Solution Approach 1:
The patent changes the form factor of the heating element from discrete wires to a continuous thin-film coating. This parameter change eliminates contact and attachment issues entirely, as the coating is deposited directly onto the glass surface, ensuring uniform coverage and reliable adhesion without mechanical fastening problems.
Solution Approach 2:
The patent extracts the problematic metal wire component from the system and replaces it with a transparent conductive coating applied directly to the glass. This extraction eliminates the need for mechanical attachment mechanisms that cause non-uniform heating and reliability issues.
3Temperature
If metal wires are used for defogging, then heating is achieved, but the wires must be spaced apart to maintain visibility, resulting in temperature differentials and incomplete defogging in dead corners
Solution Approach 1:
The patent changes the spatial distribution parameter of the heating material from discrete spaced wires to a continuous uniform coating. This allows the heating function to cover the entire window surface uniformly without the need for spacing, eliminating temperature differentials and dead corners while maintaining full visibility.
Solution Approach 2:
The patent merges multiple discrete heating wire elements into a single continuous transparent conductive coating layer. This merging eliminates the gaps and spacing requirements between wires, providing uniform heating coverage across the entire window surface without compromising visibility.
4Power
If metal heating wires are embedded between glass layers, then defogging function is provided, but break points cause complete failure and require expensive windshield replacement
Solution Approach 1:
The patent changes the structural form of the heating element from discrete wire segments that can break to a continuous thin-film coating that is inherently more resistant to complete failure. Even if局部 damage occurs, the surrounding areas remain functional, eliminating the need for complete windshield replacement.
Solution Approach 2:
The patent applies a transparent conductive coating that is integrated into the glass structure during manufacturing, providing inherent resistance to breakage and failure. This beforehand cushioning approach ensures that even if damage occurs, the heating function is not completely lost, avoiding the need for expensive complete replacements.
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 planar heating structure achieves rapid and uniform heating of vehicle windshields, maintaining high transparency and reducing the risk of break points, thus enhancing safety and reducing maintenance costs by ensuring efficient defogging/defrosting without the need for complete windshield replacement.
Implementation Method 1
The nanometallic transparent conductive layer is disposed on the glass substrate layer and receives a voltage to generate heat energy
Implementation Method 2
The first passivation layer is disposed on the nanometallic transparent conductive layer and completely covers the nanometallic transparent conductive layer
Data Source
AI summary
A planar heating structure is disclosed. The planar heating structure includes a glass substrate layer, a nanometallic transparent conductive layer, and a first passivation layer. The nanometallic transparent conductive layer is disposed on the glass substrate layer and receives a voltage to generate heat energy. The first passivation layer is disposed on the nanometallic transparent conductive layer and completely covers the nanometallic transparent conductive layer.