Laminated Glazing Sensor Window With Balanced Obscuration Distortion
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Solution Overview
Problem
Laminated glazings, particularly those used in automotive applications, face significant optical distortion issues near obscuration bands, which can limit the effectiveness of Advanced Driver Assistance Systems (ADAS) camera views and other sensors due to uneven heating and enamel application methods, leading to high costs and cosmetic issues.
Innovation Solution
A laminated glazing design with balanced optical distortion across two glass plies by using distinct obscuration layers on each ply, with controlled infrared reflectance and sensor window portions to compensate for each other's optical distortions, reducing overall optical power and distortion across the glazing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If enamel obscuration bands are applied to glass plies and the glass is heated to shape it, then the obscuration band provides UV protection and durability, but optical distortion and burnline appear at the boundary between printed and non-printed areas
Solution Approach 1:
The patent divides the obscuration band into multiple segments: a first obscuration band on the first glass ply and a second obscuration band on the second glass ply. Each band is independently controlled with different infrared reflectance properties, allowing separate optimization of optical distortion compensation while maintaining the overall obscuration function and UV protection durability.
2Manufacturing precision
If shields are added to glass bending tools to reduce burnline, then optical distortion is reduced, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent changes the infrared reflectance parameter of the obscuration bands themselves rather than modifying the bending tools. By controlling the infrared reflectance of the first and second obscuration bands to different values, the patent achieves burnline reduction through material property optimization instead of adding complex shielding devices to the manufacturing equipment.
3Object-affected harmful factors
If enamel ink is screen-printed on glass to create obscuration bands, then UV protection and component hiding are achieved, but optical distortion occurs during subsequent heating and shaping
Solution Approach 1:
The patent uses composite obscuration bands comprising enamel ink combined with infrared-reflective particles or specialized glass compositions. The first and second obscuration bands employ different composite formulations with tailored infrared reflectance, allowing them to maintain UV protection while differentially managing thermal behavior during heating to minimize optical distortion.
4Object-affected harmful factors
If the obscuration band is made opaque to visible light for UV protection, then component hiding and adhesive protection are improved, but optical clarity for sensor windows is reduced
Solution Approach 1:
The patent applies different optical properties to different regions within the obscuration bands. The first and second obscuration bands are configured with specific infrared reflectance values that allow them to be opaque to visible light for UV protection in most areas, while sensor window portions within these bands are optimized to transmit infrared radiation, creating localized optical quality variations that satisfy both protection and sensor functionality requirements.
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
This approach significantly reduces optical distortion and power in sensor windows, enhancing the clarity and functionality of ADAS camera systems and other sensors by balancing optical distortions between the two glass plies, achieving results comparable to unprinted glass without the need for additional ceramic layers.
Implementation Method 1
the first obscuration layer having a first infrared reflectance, the second obscuration layer having a second infrared reflectance, the first infrared reflectance being different from the second infrared reflectance
Data Source
AI summary
A laminated glazing has a first glass ply having first and second surfaces, a second glass ply having third and fourth surfaces, an obscuration band around at least a portion of the glazing periphery, the obscuration band having a sensor window and comprising first and second obscuration layers, the first obscuration layer adhered to at least a portion of the periphery of the first/second surface and comprising a first sensor window portion having a first sensor window portion optical distortion, the second obscuration layer adhered to at least a portion of the periphery of the third/fourth surface and comprising a second sensor window portion having a second sensor window portion optical distortion. first and second sensor window portion optical distortions are each controlled so the absolute magnitude of the optical distortion of the sensor window is lower than the absolute magnitude of the first and second sensor window optical distortions.