Windshield Laminated Glass Structure to Suppress Bubbles
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Solution Overview
Problem
The challenge is to prevent the deterioration of the appearance of laminated glass due to the formation of bubbles caused by thickness differences between the sheet member and the shade region in the interlayer film.
Innovation Solution
The laminated glass design includes an outer and inner glass plate with an interlayer film, a mask layer with openings, and a transparent sheet member fitted into through holes. The mask layer has openings that correspond to the sheet member, allowing light from information acquisition devices to pass through. The design ensures that the distance between the inner edge of the opening and the outer edge of the sheet member, and the distance between the outer edge of the sheet member and the intersection with the mask layer, are optimized to minimize visible gaps and air accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a transparent sheet member is fitted into a through hole in the shade region to allow light passage for information acquisition devices, then the device can be properly positioned and function, but thickness differences between the sheet member and shade region cause level differences that lead to air accumulation and bubble formation, deteriorating the appearance
Solution Approach 1:
The patent applies local quality by creating a recessed portion in the interlayer film at the sheet member attachment position. This local structural modification allows the sheet member to be fitted without creating a level difference with the surrounding shade region, preventing air accumulation and bubble formation while maintaining appearance quality. The recessed portion is specifically formed only where needed, rather than uniformly across the entire interlayer film.
Solution Approach 2:
The patent implements preliminary action by forming the recessed portion in the interlayer film before fitting the sheet member. This pre-prepared recessed structure ensures that when the sheet member is attached, it sits flush with the shade region surface, preventing level differences and air trapping. The recessed portion is created in advance during the manufacturing process, so the sheet member simply needs to be fitted into the pre-formed recess.
2Manufacturing precision
If the sheet member thickness is made exactly the same as the shade region thickness, then level differences and air accumulation are prevented, but it becomes very difficult to achieve exact thickness matching between different components
Solution Approach 1:
Instead of requiring the sheet member to match the shade region thickness exactly, the patent applies local quality by forming a recessed portion in the interlayer film at the specific attachment location. This allows the sheet member to have its own thickness while the recessed portion compensates for any thickness difference, achieving flush surface alignment without difficult precision matching of the sheet member itself to the shade region.
3Object-affected harmful factors
If the glass plates are made to bend along the sheet member to flatten level differences, then air accumulation is prevented, but the glass plates do not come into contact with the interlayer film, creating gaps that may still trap air
Solution Approach 1:
The patent implements preliminary action by forming the recessed portion in the interlayer film before assembling the laminated glass structure. This pre-formed recess ensures that when the glass plates are pressed during lamination, they make proper contact with the interlayer film at the sheet member location, preventing gaps and air accumulation. The recessed portion is created in advance to guide the glass plates into proper contact positions.
Data Source
AI summary
The present invention is a windshield on which an information acquisition device that acquires information from outside of a vehicle by emitting and/or receiving light can be arranged, the windshield including: an outer glass plate; an inner glass plate; an interlayer film arranged between the outer glass plate and the inner glass plate; and a mask layer laminated on at least one of a surface on a vehicle interior side of the outer glass plate and a surface on a vehicle exterior side of the inner glass plate, in which the interlayer film includes a colored shade region, a transparent non-shade region, and a transparent sheet member that is fitted into at least one through hole formed over the shade region and the non-shade region.