Inclined Sensor Cover Anti-Reflective Coating
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Solution Overview
Problem
The existing sensor modules on vehicles, with aerodynamically-shaped covers, suffer from reduced infrared ray transmittivity due to the diagonal arrangement of the cover relative to the transmission direction, leading to increased reflection and decreased detection accuracy of infrared sensors.
Innovation Solution
An electromagnetic wave transmissive cover with an anti-reflective portion on at least one surface, inclined with respect to the transmission direction, is used to reduce reflection and maintain high transmittivity, while also improving the aesthetic appeal and aerodynamics of the vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the cover is arranged diagonally relative to the transmission direction to improve aerodynamics and aesthetics, then air resistance is reduced and aesthetic appeal is improved, but the angle of incidence increases and transmittivity decreases
Solution Approach 1:
The patent applies an anti-reflective coating specifically on the surface of the cover that is exposed to electromagnetic waves. This local treatment reduces reflection at the critical interface where waves enter the cover, thereby improving transmittivity without changing the overall diagonal arrangement of the cover for aerodynamic and aesthetic purposes.
Solution Approach 2:
The patent changes the optical parameters of the cover surface by applying an anti-reflective coating with specific refractive index properties. This coating reduces the reflection coefficient at the air-cover interface, allowing more electromagnetic waves to transmit through the cover even at increased angles of incidence caused by the diagonal arrangement.
2Shape
If the cover is arranged diagonally relative to the transmission direction to improve aerodynamics and aesthetics, then air resistance is reduced and aesthetic appeal is improved, but the amount of reflection increases
Solution Approach 1:
The anti-reflective coating is applied locally on the surface of the cover that interfaces with electromagnetic waves. This targeted treatment reduces reflection at the specific location where wave transmission occurs, while maintaining the overall diagonal shape of the cover for aerodynamic and aesthetic purposes.
Solution Approach 2:
The patent converts the harmful reflection effect into a beneficial outcome by applying an anti-reflective coating that transforms the high-reflection diagonal surface into a low-reflection surface. The diagonal arrangement that initially causes harmful reflection is retained for aerodynamic and aesthetic benefits, while the coating converts the reflection harm into improved wave transmission.
3Ease of operation
If the cover is arranged diagonally relative to the transmission direction to improve aerodynamics and aesthetics, then air resistance is reduced and aesthetic appeal is improved, but transmittivity of electromagnetic waves decreases
Solution Approach 1:
The anti-reflective coating is applied to the specific surface of the cover that interfaces with electromagnetic waves. This local modification improves transmittivity at the wave-entry interface without altering the diagonal arrangement of the cover that provides aesthetic appeal and aerodynamic benefits.
Solution Approach 2:
The cover becomes a composite structure combining the base cover material with an anti-reflective coating layer. This composite structure maintains the diagonal shape for aesthetic and aerodynamic purposes while the coating layer provides enhanced electromagnetic wave transmission properties.
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 anti-reflective layer ensures a transmittance of 80% or greater for near-infrared rays at angles between 30 and 60 degrees, enhancing detection accuracy and maintaining the vehicle's aesthetic appeal without increasing air resistance.
Implementation Method 1
The anti-reflective portion reduces reflection of the electromagnetic wave
Implementation Method 2
an anti-reflective portion arranged on at least one of two surfaces of the cover body in the transmission direction
Data Source
AI summary
An electromagnetic wave transmissive cover is configured to be employed in a vehicle equipped with a sensor device. The sensor device is configured to transmit an electromagnetic wave in a transmission direction. The sensor device is arranged in a front end or a rear end of a roof of the vehicle. One of the front end and the rear end in which the sensor device is arranged includes an inclined surface. The inclined surface includes an opening. The electromagnetic wave transmissive cover includes a cover body arranged to close the opening of the inclined surface. The cover body extends along the inclined surface and is inclined with respect to the transmission direction. An anti-reflective portion is arranged on at least one of two surfaces of the cover body in the transmission direction to reduce reflection of the electromagnetic wave.