Vehicle Lamp Housing With Radar Wave Absorption for Ghost Suppression
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Solution Overview
Problem
Radar waves reflected by vehicle components cause ghost reflections and multiple reflections, degrading the detection function of radar devices in vehicle lamps.
Innovation Solution
A lamp device with a housing containing a radio wave absorption section that absorbs radar waves reflected by vehicle components, and a light-transmissive cover that allows radar waves to pass through, reducing ghost and multiple reflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light-transmissive cover is used to allow radar waves to pass through, then radar detection function is improved, but radar wave reflection and multiple reflection occur causing ghost signals
Solution Approach 1:
A radio wave absorption member is introduced as an intermediary component between the light-transmissive cover and the radar device. This member selectively absorbs reflected radar waves while allowing transmitted radar waves to pass through, thereby eliminating ghost signals caused by reflections without compromising the radar detection function. The absorption member acts as a mediator that filters out harmful reflected waves while preserving useful transmitted waves.
Solution Approach 2:
The radio wave absorption member is positioned specifically at locations where reflected radar waves are generated or where they would cause interference. By applying absorption properties locally at critical reflection points rather than uniformly across the entire structure, the system effectively suppresses ghost signals while maintaining radar wave transmission in other areas, thus resolving the contradiction between transmission and reflection.
2Measurement precision
If radar waves are reflected by vehicle components, then detection accuracy is degraded due to ghost signals, but adding absorption members increases device complexity
Solution Approach 1:
The radio wave absorption member is integrated with existing lamp device components such as the light-transmissive cover or housing structure. By merging the absorption function with existing structural elements rather than adding completely separate components, the system reduces detection accuracy degradation from reflections while minimizing the increase in device complexity. The absorption properties are combined with structural components that already exist in the lamp assembly.
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 lamp device effectively suppresses radar wave reflections, enabling high-precision radar functions with low noise and wide dynamic range, allowing accurate object detection even at short distances.
Implementation Method 1
a radio wave absorption section provided on a surface of the housing that faces the light-transmissive cover or on a surface on the opposite side therefrom
Implementation Method 2
a light-transmissive cover which is attached to cover a front surface of the housing in such a manner as to accommodate therein the lamp unit and the radar unit, and through which the radar wave passes
Data Source
AI summary
Provided is a lamp device including: a housing, which is a part to be attached to a vehicle; a lamp unit; a radar unit having an antenna which transmits a radar wave and receives a reflection wave from an object; a light-transmissive cover which is attached to cover a front surface of the housing so as to accommodate therein the lamp unit and the radar unit, and through which the radar wave passes; and a radio wave absorption section provided on a surface of the housing that faces the light-transmissive cover or on a surface on the opposite side therefrom.