Laminated glass for automobile window and automobile
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Solution Overview
Problem
Laminated glass for automobile windows fails to effectively reduce impact on pedestrians during collisions while maintaining visibility for occupants, as existing solutions do not adequately control cracking patterns to absorb impact without obstructing external views.
Innovation Solution
A laminated glass design featuring a first glass plate, an intermediate film, and a second glass plate with heterogeneous regions formed by laser irradiation on the surfaces facing the inside of the vehicle, spaced apart in a plane direction, to facilitate controlled cracking and absorb impact, maintaining visibility and reducing injury.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the laminated glass is made stronger to maintain structural integrity, then the visibility is improved, but the impact reduction capability deteriorates
Solution Approach 1:
Heterogeneous regions are formed in advance within the glass plate using laser irradiation, creating predetermined weak points that will initiate cracking upon impact. This preliminary action allows the glass to have high overall strength while containing specific zones designed to fail first, thereby reducing impact forces on pedestrians during collisions.
Solution Approach 2:
The glass plate has non-uniform structure with heterogeneous regions having different properties from the surrounding homogeneous glass. These localized regions with altered density and refractive index serve as controlled weakness points that initiate cracking, while the rest of the glass maintains high strength for structural integrity and visibility.
2Object-affected harmful factors
If heterogeneous regions are formed to enable controlled cracking, then the impact reduction capability is improved, but the visibility may be obstructed
Solution Approach 1:
The heterogeneous regions are created with localized changes in density and refractive index that are sufficient to initiate cracking under impact but minimal enough to maintain overall optical transparency. The laser irradiation parameters are controlled to create subtle structural variations rather than visible defects, preserving visibility while enabling controlled failure modes.
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 allows for controlled cracking of the laminated glass upon impact, reducing the force exerted on pedestrians while ensuring visibility for vehicle occupants by strategically weakening the glass without compromising its structural integrity during normal use.
Implementation Method 1
a plurality of heterogeneous regions formed by a laser are provided in a vicinity of a surface of a first glass plate
Implementation Method 2
heterogeneous regions formed by a laser are provided in a vicinity of a surface of the first glass plate
Data Source
AI summary
A laminated glass for an automobile window, the laminated glass including a first glass plate, an intermediate film, and a second glass plate in this order from outside of a vehicle to inside of the vehicle, wherein a plurality of heterogeneous regions formed by a laser are provided in a vicinity of a surface of the first glass plate, a surface of the second glass plate, or the surfaces of the first glass plate and the second glass plate, the surfaces facing the inside of the vehicle, being spaced apart in a plane direction, a ratio of a length in a thickness direction to a circle equivalent diameter in plan view of the heterogeneous regions is 2 or more and 1,000 or less.