Laminated Glass Thickness Ratio for Sensor Clarity
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Solution Overview
Problem
Laminated glass windshields with wedge-shaped sections face challenges in maintaining sensor information acquisition performance and preventing visual distortion, particularly when a colored ceramic shielding layer is used, which can cause transmitted distortion due to heat absorption differences.
Innovation Solution
A laminated glass design with an interlayer between vehicle-exterior and interior glass plates, featuring an information acquisition area with a shielding layer and a test area, where the information acquisition area is positioned higher than the test area, and the ratio of thickness differences between the glass plates is greater than or equal to 1.01, ensuring improved sensor performance and reduced visual distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shielding layer made of colored ceramic layer is formed around the information acquisition area, then the sensor can obtain information, but transmitted distortion occurs due to difference in heat absorption between the colored ceramic and the glass
Solution Approach 1:
The patent applies parameter changes by carefully controlling the thickness ratio of the two glass plates (making one plate thicker than the other with a specific ratio) to compensate for the thermal distortion caused by the colored ceramic shielding layer. This parameter adjustment balances the thermal expansion differences and reduces transmitted distortion while maintaining the shielding function.
Solution Approach 2:
The patent employs asymmetry by making one glass plate thicker than the other in the laminated glass structure. This asymmetric thickness configuration creates a compensatory effect that counteracts the thermal distortion introduced by the colored ceramic shielding layer, thereby reducing transmitted distortion while preserving sensor functionality.
2Loss of information
If a laminated glass including a part having a wedge shape in cross section is adopted, then double images are reduced, but it is difficult to control transmitted distortion in the information acquisition area
Solution Approach 1:
The patent applies local quality by differentiating the thickness characteristics in different regions of the glass plates. The information acquisition area has specific thickness ratios (α) that differ from other areas (β), with α/β ≥ 1.01. This localized thickness variation optimizes both double image reduction and transmitted distortion control in the sensor region.
Solution Approach 2:
The patent uses parameter changes by establishing specific thickness ratio parameters (α and β) for different areas of the glass plates. By controlling the ratio α/β to be greater than or equal to 1.01, the patent simultaneously achieves wedge-shaped double image reduction and transmitted distortion control in the information acquisition area.
3Reliability
If the information acquisition area is provided on the laminated glass, then the sensor can recognize outside state, but visual distortion occurs when shaping the windshield
Solution Approach 1:
The patent applies parameter changes by optimizing the thickness ratio parameters (α and β) of the glass plates in the information acquisition area. By setting α/β ≥ 1.01, the patent reduces visual distortion during windshield shaping while maintaining the information acquisition functionality for sensor-based outside state recognition.
Solution Approach 2:
The patent employs preliminary action by pre-configuring the asymmetric thickness ratio of the glass plates before the windshield shaping process. This preliminary thickness configuration compensates for anticipated thermal and mechanical distortions that will occur during shaping, thereby reducing visual distortion while preserving sensor functionality.
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 design enhances sensor information acquisition and reduces visual distortion, allowing clear recognition of external scenery and HUD information while controlling double images and transmitted distortions effectively.
Implementation Method 1
the transmitted distortion is likely to occur when shaping the windshield due to the difference in heat absorption between the colored ceramic and the glass
Implementation Method 2
a laminated glass that includes a part having a wedge shape in cross section is adopted as the windshield in order to solve the problem of double images
Data Source
AI summary
A laminated glass includes an interlayer between an exterior glass plate and an interior glass plate; an information acquisition area; and a test area A specified in JIS R3212. The information acquisition area is positioned above the test area A. At least a part of a periphery of the information acquisition area is surrounded by a shielding layer formed of a colored ceramic layer. One of the exterior and interior glass plates is thicker at an upper end than at a lower end. Denoting a degree of thickness difference of the information acquisition area by α and a degree of thickness difference of the test area A by β, a ratio α/β is greater than or equal to 1.01, where α or β is the ratio of thicknesses of the exterior and interior glass plates at the center of gravity of the corresponding area.