Metal Casing Surface Treatment for Mirror and Frosted Effects
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Solution Overview
Problem
Existing methods for surface treatment of electronic devices with multiple intersecting surfaces, such as notebook computers, often result in product defects like wavy edges, blurred border lines, and corner sags due to high temperatures during rough polishing, failing to meet quality requirements.
Innovation Solution
A fabrication method involving an integrally formed metal casing with intersecting parts, where a first surface presents a frosted or etched pattern and a second surface achieves a mirror effect, using CNC precision machining and polishing treatments to maintain a smooth intersection line and protect the first surface from damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high temperature rough polishing is used to achieve a mirror effect on metal surfaces, then the mirror effect is improved, but the first surface suffers damage and produces defects like wavy edges and blurred border lines
Solution Approach 1:
The metal casing is divided into multiple surfaces with different visual effects. The first surface undergoes only fine polishing to maintain its frosted/etched appearance, while the second surface undergoes both rough and fine polishing to achieve mirror effect. This segmentation allows different processing treatments for different surfaces, preventing damage to the first surface while achieving the desired mirror effect on the second surface.
Solution Approach 2:
Different surface treatments are applied to different regions of the metal casing based on their required visual effects. The first surface receives a first fabrication process (fine polishing only) to preserve its frosted or etched pattern appearance, while the second surface receives a second fabrication process (rough polishing followed by fine polishing) to achieve mirror effect. This local quality approach ensures each surface has the appropriate finish for its intended aesthetic function.
2Illumination intensity
If multiple surfaces with different visual effects are created on intersecting metal surfaces, then aesthetic appeal is improved, but the complexity of surface treatment increases
Solution Approach 1:
A protective film is applied to the first surface before the rough polishing process. This preliminary protective action prevents the first surface from being damaged during subsequent processing steps. After fine polishing of both surfaces, the protective film is removed from the first surface, revealing its intended frosted or etched pattern appearance while the second surface maintains its mirror effect.
Solution Approach 2:
A protective film serves as an intermediary layer between the first surface and the rough polishing process. This film acts as a barrier that protects the first surface from the harsh rough polishing conditions while allowing the second surface to be properly treated. The protective film is selectively removed after processing to reveal the different visual effects on different surfaces.
Data Source
AI summary
An electronic device includes an integrally formed metal casing including a first part and a second part that are intersecting with each other. An outer surface of the first part is a first surface presenting a first visual effect. An outer surface of the second part is a second surface presenting a second visual effect. The second visual effect is different from the first visual effect, and the second visual effect is a mirror effect. A boundary line between the second visual effect and the first visual effect is used to distinguish the first surface and the second surface.