Lens Plate Anti-Transmission Features for Rain Sensor Uniformity
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Solution Overview
Problem
Existing rain sensor lens plates have non-uniform light distribution on windshields, making it difficult to detect wetting at the edges due to lower light intensity, resulting in a smaller effective measurement surface.
Innovation Solution
Incorporating anti-transmission features on the transmitter-side lens structure to attenuate light in high-intensity regions, ensuring a more uniform light distribution across the windshield by preventing or scattering light in specific areas, allowing for a larger surface to be utilized for wetting detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the light intensity decreases towards the edge, then the effective measurement surface is limited, but the actual illuminated surface is larger
Solution Approach 1:
The patent resolves this contradiction by applying local quality through strategic placement of anti-transmission features. These features are positioned to attenuate light specifically in regions where intensity is naturally high (middle region), while allowing light to pass through regions where intensity is already low (edge regions). This selective attenuation equalizes the light distribution, enabling the entire illuminated surface including edges to contribute effectively to wetting detection, thus maximizing the effective measurement surface area.
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
Achieves a homogeneous light intensity on the windshield, enabling a larger area to be used for wetting detection, improving the sensitivity and accuracy of rain sensor measurements.
Implementation Method 1
anti-transmission features which in individual regions of the lens plate partially or completely prevent the passage of the light emitted by a light transmitter
Implementation Method 2
The transmitter-side light output structure deflects the light bundle by about 45°
Implementation Method 3
After traversing the coupling layer and the glass it reaches the outer surface thereof. There, the light bundle is totally reflected
Implementation Method 4
before it is focused onto the surface of the light receiver by the receiver-side light output structure
Data Source
AI summary
In a lens plate (18) for an optical sensor device in a vehicle, in particular for a rain sensor, with a transmitter-side lens structure (26) and a receiver-side lens structure (32), the transmitter-side lens structure (26) partially is provided with anti-transmission features which in individual regions of the lens plate (18) partially or completely prevent the passage of the light emitted by a light transmitter (14).