Ultra-Thin Chemically Strengthened Glass Warpage Control
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Solution Overview
Problem
Ultra-thin glass sheets for chemical strengthening, particularly those with a thickness of 0.1 mm or less, experience significant warpage and deflection during manufacturing, leading to increased breakage due to non-uniform thickness distribution and warpage at the ends, making handling and conveyance difficult.
Innovation Solution
A glass sheet design with warpage peaks positioned inward from the peripheral edge, defined by specific height and thickness relationships, minimizing breakage during manufacturing by ensuring warpage is contained within controlled dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the glass sheet thickness is reduced to 0.1 mm or less to achieve thinner cover glass, then the portability and bendability are improved, but the deflection and warpage increase significantly making handling difficult
Solution Approach 1:
The patent applies local quality by creating a thickness gradient in the glass sheet where the central effective portion has uniform thin thickness (0.1mm or less) while the peripheral edge portions have gradually increased thickness. This local variation in thickness provides different mechanical properties to different regions: the thin center allows portability while the thicker edges provide structural support and reduced warpage for stable handling.
Solution Approach 2:
The patent resolves the thickness contradiction by transitioning from a one-dimensional uniform thickness to a two-dimensional thickness distribution. The thickness is no longer a single value but varies spatially across the glass sheet, with the effective portion having different thickness characteristics than the peripheral portions, thereby solving both portability and handling requirements simultaneously.
2Manufacturing precision
If the glass sheet thickness is reduced to achieve uniform thickness over the effective portion, then the portability is improved, but wave-like discontinuous warpage occurs at the ends making the glass sheet prone to breakage
Solution Approach 1:
The patent eliminates warpage-induced breakage by applying local quality through a thickness gradient design. The peripheral edge portions have gradually increased thickness compared to the central effective portion, which suppresses warpage formation at the edges while maintaining uniform thin thickness in the center. This local thickness variation prevents the wave-like discontinuous warpage that would otherwise occur during forming.
3Length of moving object
If the glass sheet is made ultra-thin to meet product requirements, then the device portability is improved, but the glass sheet becomes prone to breakage during manufacturing steps such as cutting and conveyance
Solution Approach 1:
The patent resolves the strength-thickness contradiction by applying local quality: the central effective portion maintains ultra-thin dimensions (0.1mm or less) for portability, while the peripheral edge portions have gradually increased thickness providing enhanced structural strength and breakage resistance during handling and manufacturing processes.
Data Source
AI summary
In a glass sheet 12 for chemical strengthening having a thickness of 0.1 mm or less, the glass sheet 12 has a warped shape as a whole or includes a warped part in a portion thereof. When the glass sheet 12 is placed on a horizontal surface with one main surface 12a facing upward, a first peak position D1 is present in a part inside a peripheral edge portion 12e of the glass sheet 12, where the first peak position D1 is a position having the highest height from the horizontal surface in the glass sheet 12, and the peripheral edge portion 12e is a part having a width of 10 mm along a peripheral edge of the glass sheet 12.