Vehicle Windshield Glass with Cutout for Mirror Mounting
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Solution Overview
Problem
Conventional laminated glass structures for vehicle windshields with an inner mirror face issues of reduced rigidity and increased risk of breakage when a thinner glass plate is used for the vehicle inside glass plate, leading to potential breakage under external forces like adjusting the mirror angle.
Innovation Solution
A laminated glass design featuring a vehicle outside glass plate and a thinner vehicle inside glass plate bonded via an intermediate film, with the mirror base mounted to the vehicle outside glass plate through a cutout portion, reducing the thickness of the inside glass plate to 1.3 mm or less and enhancing the rigidity of the windshield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the vehicle inside glass plate is made thinner to reduce weight, then the weight of the laminated glass is reduced, but the rigidity of the vehicle inside glass plate decreases and it becomes more prone to breakage under external forces
Solution Approach 1:
The patent introduces a cutout portion in the vehicle inside glass plate at the upper edge, creating a segmented structure that redirects mounting forces away from the thin glass plate to the vehicle outside glass plate, thereby maintaining weight reduction while preventing breakage
Solution Approach 2:
The mirror base is positioned as an intermediary element that mounts to the vehicle outside glass plate rather than directly to the thin inside glass plate, transferring the load path through the intermediate structure to avoid stressing the thin glass plate
2Weight of moving object
If the vehicle inside glass plate is made thinner to reduce weight, then the weight of the vehicle is reduced, but the likelihood of breakage when external force is applied increases
Solution Approach 1:
The cutout portion segments the upper edge region of the vehicle inside glass plate, creating a structural discontinuity that prevents stress concentration and crack propagation in the thin glass plate when external forces are applied to the mirror
Solution Approach 2:
The vehicle outside glass plate serves as an intermediary mounting surface that absorbs and distributes external forces applied to the mirror, protecting the thin vehicle inside glass plate from direct stress and improving its reliability
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 reduces the likelihood of the vehicle inside glass plate breaking under external forces and minimizes weight while maintaining the required flexural rigidity, ensuring the laminated glass is less prone to breakage and weight reduction.
Implementation Method 1
a laminated glass including a vehicle outside glass plate, and a vehicle inside glass plate bonded to the vehicle outside glass plate via an intermediate film
Data Source
AI summary
A laminated glass for vehicle with an inner mirror mounted to an opening of a vehicle body includes a laminated glass including a vehicle outside glass plate, and a vehicle inside glass plate bonded to the vehicle outside glass plate via an intermediate film; and an inner mirror mounted to the laminated glass via a mirror base. A plate thickness of the vehicle inside glass plate is less than a plate thickness of the vehicle outside glass plate, and is 1.3 mm or less. The vehicle inside glass plate has a cutout portion in at least a part of an upper edge. The mirror base is mounted to a vehicle interior surface of the vehicle outside glass plate through the cutout portion of the vehicle inside glass plate.