Laminated Vehicle Pane Coating for Angle-Stable Reflection Color
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Solution Overview
Problem
Panoramic vehicle laminated panes with sun protection coatings exhibit varying reflection colors due to different viewing angles, leading to an inhomogeneous aesthetic impression.
Innovation Solution
A vehicle laminated pane with a sun protection coating comprising a specific layer structure, including alternating silver and dielectric layers, applied to the interior-side surface of the outer pane, and a tinted thermoplastic intermediate layer, ensuring a neutral blue/greenish reflection color that minimizes angle-dependent changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a sun protection coating is applied to panoramic vehicle panes, then thermal radiation reflection is improved, but reflection color homogeneity deteriorates due to viewing angle dependence
Solution Approach 1:
The patent applies a multi-layer coating structure with specific thickness ratios (silver layers Ag1, Ag2, Ag3 with thicknesses in ratio 0.41/Ag32/Ag33 and dielectric modules M1, M2, M3, M4 with optical thickness ratios M2/M1≥1.9, M2/M3≥0.8, M2/M4≥1.6) to control the optical properties. By precisely controlling the thickness parameters of each layer, the coating achieves consistent reflection color (negative a* and b* coordinates in CIE color space) across different viewing angles while maintaining high thermal radiation reflection
Solution Approach 2:
The patent uses a composite multi-layer structure combining silver layers (metallic material) with dielectric modules (insulating materials) to create a sun protection coating that simultaneously achieves high thermal radiation reflection and angle-independent reflection color. The combination of different material types with complementary properties enables both energy efficiency and aesthetic homogeneity
2Loss of energy
If a multi-layer sun protection coating is applied, then thermal radiation reflection is improved, but manufacturing complexity increases
Solution Approach 1:
The sun protection coating is segmented into distinct functional layers: silver layers (Ag1, Ag2, Ag3) for thermal radiation reflection and dielectric modules (M1, M2, M3, M4) for optical control. This segmentation allows each layer to be optimized independently for its specific function while maintaining overall system performance and enabling standardized manufacturing processes
3Stability of the object's composition
If the thermoplastic intermediate layer is tinted, then reflection color consistency is improved, but visible light transmission is reduced
Solution Approach 1:
The tinting is applied locally to the thermoplastic intermediate layer in specific regions (particularly in the third region A3 starting from the upper edge) rather than uniformly across the entire pane. This localized tinting approach enhances reflection color consistency in areas where it is most needed while minimizing the overall impact on visible light transmission through the complete laminated pane structure
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 visually pleasing and consistent reflection color across viewing angles, enhancing aesthetic appeal and energy efficiency by reducing thermal radiation penetration.
Implementation Method 1
panes of the vehicle can be provided with a coating which reflects parts of the solar radiation, in particular infrared radiation
Implementation Method 2
a sun protection coating... which substantially reflects or absorbs rays outside the visible spectrum of the solar radiation, in particular infrared rays
Implementation Method 3
a further, transparent coating which is spatially separated from the sun protection layer and which is substantially reflective of heat rays (also referred to as a Low-E layer)
Implementation Method 4
a sun protection coating... which substantially reflects or absorbs rays outside the visible spectrum of the solar radiation, in particular infrared rays
Data Source
AI summary
A vehicle laminated pane, designed as a combined front and roof pane, has a lower and upper edges and two lateral pane edges includes an outer pane with an outer-side surface and an interior-side surface, an inner pane with an outer-side surface and an interior-side surface, and a thermoplastic intermediate layer which connects the outer pane to the inner pane. The vehicle laminated pane has a first region starting from the lower edge, a third region starting from the upper edge, and a second region which connects the first region and the third region, the interior-side surface of the outer pane has an opaque cover print at least in a peripheral edge region of the vehicle laminated pane, and a sun protection coating is applied to the interior-side surface of the outer pane.