Compressively Stressed Laminated Glass via Photosensitive Cladding
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Solution Overview
Problem
Glass articles used in electronic devices require enhanced strength to withstand regular contact and incidental impacts during use and transport, as they are susceptible to damage from touch functionality and handling.
Innovation Solution
A laminated glass article is formed using a fusion lamination process with a glass core and photosensitive glass cladding layers, where the cladding layers are exposed to UV light to induce nucleation and crystallization, resulting in compressively stressed layers that strengthen the glass structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If glass articles are made robust to endure regular contact, then strength is improved, but weight and complexity increase
Solution Approach 1:
The patent applies composite materials by combining glass core layers with photosensitive glass cladding layers to form a laminated structure. The photosensitive glass contains silver nuclei that, when exposed to UV light, crystallize to form compressively stressed layers. This composite structure provides enhanced strength and durability while maintaining the overall glass article form, resolving the contradiction between strength improvement and complexity increase.
Solution Approach 2:
The patent utilizes parameter changes by exposing the photosensitive glass cladding layers to UV light, which induces crystallization and transforms the physical state of the glass. This phase change creates compressively stressed layers within the cladding, significantly enhancing the strength of the glass article without requiring additional structural complexity. The parameter change from amorphous glass to crystalline structure with compressive stress is the key mechanism.
2Strength
If photosensitive glass cladding layers are added to enhance strength, then glass strength is improved, but manufacturing process complexity increases
Solution Approach 1:
The patent applies preliminary action by incorporating silver nuclei within the photosensitive glass cladding layers during the glass manufacturing process, before the strengthening treatment. These pre-formed nuclei are positioned to become crystallization centers when the glass is later exposed to UV light. This preliminary preparation simplifies the subsequent strengthening process, as the crystallization occurs automatically upon UV exposure without requiring additional complex manufacturing steps.
3Reliability
If compressively stressed layers are formed through UV exposure, then glass durability is improved, but production time increases
Solution Approach 1:
The patent utilizes parameter changes by exposing the photosensitive glass cladding layers to UV light, which induces crystallization and transforms the physical state of the glass. This phase change creates compressively stressed layers within the cladding, significantly enhancing the strength and durability of the glass article. The UV exposure process, while adding time, enables a direct phase transformation that would otherwise require more complex and time-consuming mechanical strengthening processes.
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 method enhances the strength and durability of the glass articles, enabling them to withstand routine contact and impacts without damage, making them suitable for use in electronic devices such as mobile phones and displays.
Implementation Method 1
the laminate structure is then exposed to UV light, sufficient to cause nucleation within the photosensitive composition, thereby growing a secondary crystal phase within that cladding layer
Implementation Method 2
growing a secondary crystal phase within that cladding layer which results in compressively stressing the clad layer
Implementation Method 3
growing a secondary crystal phase within that cladding layer which results in compressively stressing the clad layer, and strengthening the laminated glass structure
Data Source
Figure 1~2
AI summary
Laminated articles comprised of glass core and clad layers, more specifically, to compressively stressed laminated articles comprising a glass core sandwiched between first and second clad layers, the clad layers being formed from photosensitive glass.