Ion-Exchanged Window with Gradient Compressive Stress
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Solution Overview
Problem
Existing windows used in electronic devices lack sufficient compressive stress and impact strength, particularly in thinner and lighter designs, which makes them vulnerable to external impacts.
Innovation Solution
A window with a compressive stress region that includes Li+, Na+, and K+ ions, featuring a first compressive stress portion with a specific ion concentration gradient and a second compressive stress portion with a different ion concentration gradient, enhancing the compressive stress and impact strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the window is made thinner and lighter to meet slimming demands, then the weight and thickness are reduced, but the structural strength and impact resistance deteriorate
Solution Approach 1:
The patent applies chemical tempering to change the physical-chemical parameters of the window surface by controlling ion exchange processes. Different ion concentrations (K+, Na+, Li+) are introduced at different depths to create compressive stress patterns that enhance strength without increasing thickness or weight
Solution Approach 2:
The window surface is transformed into a composite structure with multiple ion layers having different compositions and properties. The first compressive stress portion contains K+, Na+, and Li+ ions, while the second portion contains primarily Li+ ions, creating a multi-layer composite that provides enhanced mechanical properties
2Strength
If chemical tempering is applied to increase compressive stress, then the impact strength is improved, but the manufacturing process complexity increases
Solution Approach 1:
The chemical tempering process is divided into multiple stages, each creating a distinct ion concentration layer. The first stage creates the first compressive stress portion with specific ion ratios, and the second stage creates the second compressive stress portion, allowing precise control over the stress profile
Solution Approach 2:
The patent controls manufacturing parameters including ion concentration ratios, treatment temperatures, and immersion times to optimize the tempering process. By adjusting these parameters, the desired compressive stress pattern is achieved while managing process complexity
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 window achieves increased compressive stress and impact strength, providing improved protection against external impacts while maintaining a slim and lightweight design.
Implementation Method 1
The compressive stress region includes Li+, Na+, and K+ ions
Data Source
AI summary
A window includes a base region and a compressive stress region disposed on the base region. The compressive stress region includes Li+, Na+, and K+ ions. The compressive stress region includes a first compressive stress portion in which a concentration of the K+ ions decreases, a concentration of Na+ ions increases, and a concentration of the Li+ ions increases, from a surface of the window toward the base region. A second compressive stress portion is adjacent to the first compressive stress portion. In the second compressive stress portion, the concentration of the Na+ ion decreases and the concentration of the Li+ ion increases, from the first compressive stress portion toward the base region. The window thereby has a high surface compressive stress value and impact resistance.