Motor Vehicle Sensor Cover With Dichroic Radar-Transparent Coating
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Solution Overview
Problem
Metallic materials used in sensor covers for motor vehicles negatively affect radar performance and efficiency, and their lighting is poor due to low transmission.
Innovation Solution
A sensor cover with a dichroic, nonmetallic, and reflective layer composed of dielectric materials that allows radar waves to pass through while reflecting certain visible light wavelengths, enhancing radar performance and lighting efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a metallic layer is applied to the cover for aesthetic appearance, then the reflective property is improved, but the radar performance deteriorates due to negative effect on radar waves
Solution Approach 1:
The patent replaces the metallic layer with a dichroic layer that has optical properties similar to metal but does not interfere with radar waves. The dichroic layer is composed of dielectric materials arranged in specific thicknesses to achieve the desired reflective appearance while being transparent to radar frequencies.
Solution Approach 2:
The patent uses a composite structure with multiple dielectric layers of different materials and thicknesses to create the dichroic effect. This composite approach allows tuning of optical properties to match metallic appearance while maintaining radar wave transmission.
2Illumination intensity
If a metallic layer is applied to the cover, then the reflective appearance is improved, but the lighting efficiency deteriorates due to low transmission
Solution Approach 1:
The patent replaces the metallic layer with a dichroic layer that allows light transmission while maintaining reflective appearance. The dichroic layer's dielectric structure enables light to pass through more efficiently than metal, improving lighting efficiency while preserving the desired aesthetic appearance.
3Reliability
If a dichroic layer is used instead of metallic layer, then the radar performance is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent optimizes the thickness and material composition of each dielectric layer to achieve the desired dichroic effect. By carefully selecting parameters such as layer thickness and refractive index, the patent creates a manufacturable solution that balances performance requirements with manufacturing feasibility.
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 dichroic layer minimizes interference with radar beams and improves lighting efficiency, allowing for clear illumination and attractive appearance without apparent lighting, while maintaining radar functionality.
Implementation Method 1
The functioning of the dichroic layer is based on light wave interference
Implementation Method 2
a dichroic, nonmetallic, and reflective layer is placed on at least part of the mount
Implementation Method 3
The dichroic layer is nonmetallic and is composed of numerous thin layers of dielectric material, which have a significantly lower effect on radar beams
Implementation Method 4
an absorbing layer can be placed on the mount adjacent to the dichroic layer, which absorbs visible light exiting the mount
Data Source
AI summary
The invention relates to a sensor device with a sensor that is concealed by a cover for a motor vehicle and detects incoming electromagnetic waves, wherein the cover has a mount through which the incoming electromagnetic waves can pass, on at least part of which a layer is placed, characterized in that the layer is dichroic, nonmetallic, and reflective.