Radar-Transparent Grille Plate With Ultra-Thin Metallization
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Solution Overview
Problem
Current solutions for radar-transparent decorative plates for motor vehicle front grilles are complex, costly, and lack high production volume efficiency due to multi-layer configurations, precise masking requirements, and inadequate weather resistance, especially when using PVD metallization on PMMA and ABS-PC materials.
Innovation Solution
A monobloc decorative plate with a transparent PMMA first layer and an opaque ABS-PC second layer, featuring an ultra-thin PVD metallization layer and a shadowing layer for enhanced adhesion and aesthetic quality, ensuring radar transparency and durability while simplifying production processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a multi-layer configuration with PVD metallization is used for decorative plates, then aesthetic quality is improved, but production cost and complexity increase
Solution Approach 1:
The patent combines the decorative metallization function and the radar transparency function into a single integrated layer structure. The PVD metallization is applied directly on the PMMA layer without requiring separate masking operations for different zones, merging multiple production steps into one continuous process that reduces complexity while maintaining aesthetic quality.
Solution Approach 2:
The patent optimizes the thickness parameter of the PVD metallization layer to be ultra-thin (less than 0.05 micrometres), which allows the layer to be aesthetically pleasing while simultaneously being transparent to radar waves. This parameter optimization resolves the contradiction by finding a thickness value that satisfies both aesthetic and functional requirements.
2Strength
If PVD metallization is applied on PMMA and ABS-PC materials, then adhesion is improved, but weather resistance deteriorates
Solution Approach 1:
The patent uses a composite structure where PMMA (polymethylmethacrylate) serves as the outer decorative layer with PVD metallization, while ABS-PC (acrylonitrile butadiene styrene-poly carbonate) provides the inner structural layer. This composite configuration leverages the excellent adhesion properties of PMMA for metallization while the ABS-PC layer provides enhanced weather resistance and structural stability.
Solution Approach 2:
The patent applies different material properties to different layers: the outer PMMA layer is optimized for aesthetic quality and metallization adhesion, while the inner ABS-PC layer is optimized for weather resistance and mechanical strength. Each layer performs its specific function locally, resolving the contradiction between adhesion and weather resistance.
3Manufacturing precision
If precise masking requirements are implemented for PVD metallization, then decorative precision is improved, but production time and cost increase
Solution Approach 1:
The patent incorporates the masking pattern directly into the PMMA layer geometry before PVD metallization is applied. The PMMA layer is pre-shaped with the exact decorative contours needed, eliminating the need for separate masking operations during metallization. This preliminary preparation of the substrate geometry ensures decorative precision while significantly reducing production time.
4Reliability
If ultra-thin PVD metallization layer is used, then radar transparency is improved, but adhesion and durability worsen
Solution Approach 1:
The patent optimizes the PVD metallization layer thickness to an ultra-thin range (less than 0.05 micrometres), which creates a balance where the layer is thin enough to allow radar wave transmission while still providing sufficient adhesion and durability. This precise parameter control resolves the contradiction between radar transparency and adhesion strength.
Solution Approach 2:
The ultra-thin metallization layer is applied on the PMMA substrate, which provides excellent adhesion properties. The PMMA material itself acts as an adhesion promoter, ensuring that even the ultra-thin metallization layer maintains strong bonding and durability while preserving radar transparency.
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 cost-effective, high-quality, radar-transparent decorative plate with integrated fastening elements and three-dimensional appearance, maintaining radar system functionality and aesthetic appeal, while reducing production costs and equipment maintenance.
Implementation Method 1
a metallized effect obtained by means of a PVD deposition technique
Implementation Method 2
transparent to the emission waves of a radar system
Data Source
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AI summary
Radar transparent decorative plate (10) for the front grille (20) of a motor vehicle, of the monobloc type with a first layer (110) of PMMA transparent to light, like a smooth lens with decorative elements (111a, 111b, 111c) in relief on the back, and an overmoulded second layer (120) of opaque ABS- PC or opaque ABS that compensates for the height thereof simultaneously realizing a support with integrated fastening elements and a masking background. The invention provides on the back a particular decorative treatment (130) comprising an ultra-thin metallization layer (132), having a thickness of less than 0.05 micrometres, on which a shadowing layer (133) with an anti-transparency effect is superimposed. Embodiment variants are provided in which said decorative elements have a three-dimensional appearance obtained from a mould by means of cavities (111b, 117) in the head or with a shading optical effect (111c, 140).