Windshield Wedge Patch for ADAS Camera Image Clarity
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Solution Overview
Problem
Conventional automotive windshields cause optical distortions such as double imaging and ghosting, which impair the functionality of vehicle cameras used in advanced driver-assistance systems (ADAS) due to total internal reflection and curvature-related issues.
Innovation Solution
An automotive glazing assembly incorporating a wedge patch with a wedge-shaped polymer layer and a flat glass element is introduced, which reduces total internal reflection and corrects optical distortions by aligning with the windshield's curvature and thickness, using materials like Polyvinyl Butyral (PVB) and Thermoplastic Polyurethane (TPU) for improved clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If standard automotive windshield glass with curvature and thickness is used, then structural strength and aerodynamic compatibility are improved, but optical distortion and total internal reflection occur degrading sensor image quality
Solution Approach 1:
The windshield is segmented into multiple glass layers (first glass layer, second glass layer) with a polymer layer in between, allowing each layer to be optimized for different functions - structural strength and optical clarity
Solution Approach 2:
A polymer layer is introduced as an intermediary between the first and second glass layers. This polymer layer acts as an optical mediator that reduces total internal reflection and minimizes distortion while maintaining the structural integrity provided by the glass layers
2Adaptability or versatility
If curved glass panels are used to match vehicle design, then aerodynamic performance and aesthetic integration are improved, but light refraction and distortion increase affecting camera accuracy
Solution Approach 1:
Different regions of the windshield have different optical properties. The first and second glass layers have specific curvature and thickness characteristics optimized for the sensor field of view, while other regions maintain the overall aerodynamic shape. The polymer layer provides localized optical correction where needed
3Strength
If thicker glass panels are used to reduce curvature effects, then structural durability is improved, but weight increases and aerodynamic performance may be compromised
Solution Approach 1:
The windshield uses a composite structure combining glass layers with a polymer layer. This composite material approach provides the necessary structural strength and durability while keeping the overall weight lower than using a single thick glass panel, as the polymer material has favorable strength-to-weight 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 wedge patch enhances image clarity for vehicle sensors by minimizing distortions, ensuring accurate data interpretation for ADAS features like lane departure warnings and emergency braking.
Implementation Method 1
This effect is caused by multiple reflections within the windshield's glass layers, leading to total internal reflection
Implementation Method 2
Another issue arises from the curvature and thickness of conventional windshields, which can cause distortion and refraction of light as it passes through the glass
Data Source
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AI summary
An automotive glazing assembly designed to enhance the functionality of vehicular sensor devices, particularly cameras. The assembly includes an outer glass layer with a uniform thickness, an inner glass layer also with a uniform thickness, and a polymer layer situated between the two glass layers, bonding them together. A unique feature of this assembly is a localized area where the inner glass and polymer layers are removed and replaced with a wedge patch. This patch consists of a wedge-shaped polymer layer with a non-uniform thickness that increases in one direction, and a flat glass element attached to it. The wedge patch is specifically designed to reduce total internal reflection and double imaging, thereby improving the optical clarity for cameras positioned behind the windshield.