Laminated Glazing with Variable Interlayer Thickness
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Solution Overview
Problem
Automotive glazing, particularly panoramic windshields with complex shapes and inclined orientations, experiences significant issues with double horizontal image formation due to multiple reflections at air/glass interfaces, which affects driver vision clarity and safety.
Innovation Solution
Laminated glazing with a non-constant interlayer adhesive layer of varying thickness, specifically increasing and decreasing in certain zones, is used to attenuate the double image problem, where the thickness variation is at least 0.1 mm and forms an angle of 0.05 to 2 mrad, matching the complex geometry of the windshield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the windshield adopts complex shapes with pronounced curvatures and lateral returns to meet aesthetic and functional requirements, then the field of vision is widened and the design is improved, but the horizontal double image problem is significantly exacerbated
Solution Approach 1:
The patent applies local quality by varying the interlayer thickness specifically in the lateral return zones where double image problems occur, while maintaining constant thickness in other areas. The interlayer thickness is increased in the direction perpendicular to the lateral return to locally compensate for the harmful optical effects in these specific zones.
Solution Approach 2:
The patent changes the physical parameter of interlayer thickness from a constant value to a variable value in specific zones. By modifying the thickness parameter of the interlayer in lateral return areas, the optical path difference is adjusted to reduce the double image effect while maintaining the complex windshield geometry.
2Object-affected harmful factors
If the interlayer thickness is increased uniformly across the entire windshield to reduce double image, then the double image level is reduced, but the manufacturing complexity and material consumption increase
Solution Approach 1:
Instead of uniformly increasing interlayer thickness across the entire windshield, the patent applies thickness variation only in specific lateral return zones where double image problems occur. This localized approach reduces material consumption and manufacturing complexity compared to a uniform increase.
Solution Approach 2:
The patent applies partial action by addressing the double image problem only in the specific zones where it occurs most severely (lateral returns), rather than applying a uniform solution across the entire windshield. This targeted approach optimizes the balance between effectiveness and complexity.
3Object-affected harmful factors
If the interlayer thickness varies to compensate for complex windshield geometry, then the double image is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent localizes the thickness variation to specific zones (lateral returns) rather than the entire windshield, which concentrates the manufacturing precision requirements to manageable areas. The variable thickness is applied only where needed to compensate for the complex geometry.
Solution Approach 2:
The patent modifies the interlayer thickness parameter in a controlled manner with specific variation ranges (0.1-10mm) and angles (0.05-2 mrad). These defined parameter changes provide clear manufacturing specifications while achieving the desired optical compensation.
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 solution effectively reduces the double image phenomenon, improving driver vision clarity and safety by minimizing parasitic image intensity, especially in areas with pronounced curvatures and lateral returns, while maintaining aesthetic and functional requirements.
Implementation Method 1
The multiplication of the image seen by the driver through the windshield is a known phenomenon resulting from multiple reflections at the air/glass interfaces
Data Source
AI summary
The present invention relates to: a laminated glass panel including two sheets of glass connected by an intermediate adhesive layer, characterised in that in at least one direction, the thickness of the intermediate adhesive layer sequentially increases and decreases or decreases and increases; a transport vehicle, building or any other structure including said laminated glass panel; two methods for manufacturing said laminated glass panel including the preparation, by means of extrusion and thermoforming respectively, of an intermediate adhesive layer having a non-constant thickness; and the use of same for a land, air or water transport vehicle, in particular as a windscreen, rear window, side window or roof of an automobile, and for construction, street furniture, interior design, electrical goods, and electronics.