Metal Frame Surface Texture via Alkali Etching
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Solution Overview
Problem
Existing electronic device housings struggle to achieve a soft and matte surface texture while maintaining aesthetic appeal and protective properties.
Innovation Solution
A method involving forming curves on a metal frame surface and immersing it in an alkali etching solution containing phosphate, which results in a surface with a gloss value of 1 to 10 gloss units, irregularities of 0.1 μm to 2.3 μm in height, and 90 to 200 irregularities per unit area, providing a soft and matte texture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If conventional surface treatments (blasting, polishing, anodizing) are used on metal frames, then glossy or rough surfaces and patterned textures are achieved, but a soft and matte exterior texture similar to microfiber cloth cannot be obtained
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition of the etching solution, specifically incorporating phosphoric acid along with hydrofluoric acid and hydrogen peroxide. This chemical parameter modification enables the transformation of the metal frame surface into a soft and matte texture that resembles microfiber cloth, achieving a texture type that was previously inaccessible through conventional physical treatments alone.
Solution Approach 2:
The invention uses a composite chemical etching solution comprising multiple components: hydrofluoric acid, phosphoric acid, and hydrogen peroxide. This composite formulation works synergistically to create the desired soft matte texture, where each component contributes specific chemical reactions that collectively transform the metal surface properties in a way that single-component solutions cannot achieve.
2Shape
If metal frames are subjected to aggressive surface treatments to achieve desired textures, then aesthetic appearance is improved, but the protective properties and structural integrity may be compromised
Solution Approach 1:
The patent modifies the chemical parameters of the etching solution by introducing phosphoric acid at specific concentrations, which enables the creation of the desired surface texture through controlled chemical etching rather than aggressive mechanical processing. This parameter change allows for texture formation that preserves the underlying metal's structural integrity and protective properties.
Solution Approach 2:
The invention replaces aggressive mechanical surface treatment methods (such as blasting or extensive polishing) with a chemical etching process. This substitution achieves the desired surface texture through chemical reactions rather than mechanical force, thereby maintaining the metal frame's structural integrity and protective properties while still achieving the aesthetic appearance.
3Shape
If multiple surface treatment steps are applied to achieve both texture and protection, then aesthetic and protective properties are improved, but manufacturing complexity and time increase
Solution Approach 1:
The patent merges multiple surface treatment functions into a single chemical etching process. By incorporating phosphoric acid, hydrofluoric acid, and hydrogen peroxide together in one solution, the process simultaneously achieves texture formation, surface cleaning, and protective oxide layer creation that would traditionally require separate treatment steps, thereby reducing manufacturing complexity.
Solution Approach 2:
The invention changes the chemical parameters of a single etching solution to perform multiple functions: phosphoric acid provides controlled etching for texture, hydrofluoric acid modifies surface morphology, and hydrogen peroxide acts as a cleaning agent and oxide layer former. This parameter optimization allows one process step to replace multiple traditional steps.
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 solution effectively creates a housing with a soft and matte surface texture, similar to a microfiber cloth, while maintaining the protective and aesthetic qualities required for electronic devices.
Implementation Method 1
immersing the metal frame in an alkali etching solution including a phosphate
Implementation Method 2
an alkali etching solution including a phosphate
Data Source
AI summary
According to an embodiment, a housing of an electronic device comprises: a metal frame, wherein a surface of the metal frame has: a gloss value of 1 gloss unit (Gu) to 10 Gu, and a maximum height of a plurality of irregularities disposed on the surface in a range between 0.1 μm to 2.3 μm, and a maximum depth of valleys between the plurality of irregularities in a range between 0.1 μm to 1.8 μm, and a number of the plurality of irregularities per unit area of 1 cm2 in a range between 90 to 200.