Curved Cover Window Design for Injection Molding Transparency
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Solution Overview
Problem
The injection molding method for manufacturing cover windows with curved parts often results in convection phenomena due to temperature differences, leading to reduced fluidity and abnormal elements that hinder transparency and appearance quality.
Innovation Solution
A cover window design with curved parts having outer and inner surfaces with specific curvature radii ratios (r1≦r2≦2r1) and made of materials like polycarbonate, cyclo olefin polymer, or polymethylmethacrylate, with a thickness of 0.4 mm to 1.0 mm, to minimize temperature differences and ensure high fluidity during resin filling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the injection molding method is used to manufacture cover windows with curved parts, then the cover window can be produced with curved surfaces, but temperature differences occur causing convection phenomena that deteriorate fluidity and create abnormal elements
Solution Approach 1:
The patent applies parameter changes by optimizing the curvature radius ratio between the outer and inner surfaces of the curved part. By controlling this geometric parameter within a specific range (r1/r2), the temperature distribution during injection molding is improved, reducing convection phenomena and preventing abnormal element formation while maintaining the curved shape and transparency.
2Ease of manufacture
If the curvature radius ratio is not controlled properly, then the curved part can be formed, but convection phenomena occur reducing fluidity and creating abnormal elements
Solution Approach 1:
The patent changes the geometric parameter of the curved part by establishing a specific curvature radius ratio range (r1/r2). This parameter optimization ensures proper temperature distribution during injection molding, maintaining resin fluidity and preventing convection-related defects while enabling successful curved part formation.
3Shape
If abnormal elements are formed in the curved part, then the curved shape is achieved, but transparency and appearance quality deteriorate
Solution Approach 1:
The patent prevents abnormal element formation by optimizing the curvature radius ratio parameter. By controlling the ratio between outer and inner surface curvature radii within the specified range, temperature differences during injection molding are minimized, eliminating convection phenomena that would otherwise create abnormal elements and compromising transparency and appearance quality.
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 convection phenomena, enhancing transparency and appearance quality by maintaining high fluidity and preventing abnormal elements in the curved parts, thus improving visibility and product quality.
Implementation Method 1
a temperature difference partially occurs, and thus a convection phenomenon occurs, such that fluidity deteriorates
Data Source
AI summary
In a display device, a cover window is capable of increasing transparency of a curved part to improve visibility of a screen and appearance quality of a product. The cover window for the display device includes at least one curved part. In addition, the curved part includes an outer surface formed in an arc having a curvature radius of r1 and an inner surface formed in an arc having a curvature radius of r2, where r1≦r2≦2r1.