Vehicle Pane Coating Reducing Interior Reflections
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Solution Overview
Problem
Vehicle windows with thermal radiation-reflecting coatings often suffer from high interior reflections, disrupting the occupants' view and comfort, especially when the reflection exceeds transmission, due to the lack of optical coordination between thermal radiation and anti-reflection coatings.
Innovation Solution
A pane with a thermal radiation-reflecting coating comprising an adhesive layer, a transparent conductive oxide functional layer, an optically high-refractive layer, and an optically low-refractive layer, applied on the interior surface, which reduces interior reflections and enhances the transmittance-to-reflectance ratio, thereby improving thermal comfort and visual perception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a heat-radiation reflective coating is applied to the interior surface of a low-light-transmission pane, then thermal radiation reflection is improved, but interior reflection increases disrupting the occupants' view
Solution Approach 1:
The coating is divided into multiple functional layers, each with specific thickness and optical properties. The first layer (closest to substrate) has different refractive index and thickness parameters than the second and third layers, allowing independent optimization of thermal reflection and visual reflection reduction
Solution Approach 2:
The patent specifies precise parameter ranges for each layer: refractive indices between 1.5-2.5, thicknesses from 10-200 nm for the first layer and 20-300 nm for subsequent layers. By adjusting these parameters, the coating achieves both high thermal radiation reflection (>50%) and reduced interior reflection (<10% at 550 nm wavelength)
2Object-affected harmful factors
If the pane has reduced light transmission for privacy, then privacy is improved, but interior reflectance increases impairing visual perception
Solution Approach 1:
The patent describes how the multi-layer coating modifies the optical appearance of the pane by controlling reflection and transmission of different wavelengths. The specific layer structure and materials create an optical effect where the pane appears reflective from the exterior while maintaining good transmission from the interior, effectively managing visual perception and privacy
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 coating effectively reduces heat radiation emission into the vehicle interior, minimizes interior reflections, and enhances the transmittance-to-reflectance ratio, providing improved thermal comfort and a clearer view of the external environment.
Implementation Method 1
reflects a significant portion of solar radiation, particularly in the infrared range... reflects the heat radiation emitted by the entire pane towards the interior... reflects the heat radiation emitted from the interior
Implementation Method 2
an adhesive layer containing at least one material with a refractive index of less than 1.8, a functional layer containing at least one transparent electrically conductive oxide (TCO), an optically high refractive index layer containing at least one material with a refractive index greater than or equal to 1.8, and an optically low refractive index layer containing at least one material with a refractive index of less than 1.8
Data Source
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AI summary
The invention relates to a panel with a coating which reflects thermal radiation, comprising at least one substrate (1) and at least one thermal radiation-reflecting coating (2) at least on the interior-side surface of the substrate (1), wherein - the panel has a transmission in the visible spectrum range of less than 5%, and - starting from the substrate (1), the coating (2) at least comprises: - an adhesive layer (3) which contains at least one material with a refractive index of less than 1.8, - a functional layer (4) which contains at least one transparent electrically conductive oxide, - an optically high-refractive-index layer (5) which contains at least one material with a refractive index greater than or equal to 1.8, and - an optically low-refractive-index layer (6) which contains at least one material with a refractive index of less than 1.8.