Anodized Layer Recess Variation Control
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Solution Overview
Problem
Anodization processes often result in variations in the recessed portions of anodized layers, particularly when forming large-area layers, which can lead to inconsistent reflection characteristics in antireflection elements.
Innovation Solution
A method involving a controlled voltage increase and decrease pattern, including peak values and a target value, with specific time change rates for forming a porous alumina layer, and an etching step to reduce variations in the anodized layer's recessed portions, forming an anodized layer with reduced variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If voltage is continuously increased to the target value during anodization, then the anodized layer formation efficiency is improved, but the variation in recessed portions increases
Solution Approach 1:
The patent applies periodic voltage changes during anodization, specifically increasing voltage to a peak value and then decreasing it to a valley value before reaching the final target value. This periodic voltage modulation creates controlled formation and dissolution cycles that reduce variation in recessed portions while maintaining efficient anodized layer formation.
Solution Approach 2:
The patent changes the voltage parameter dynamically during the anodization process rather than applying a continuous monotonic increase. By modulating voltage between peak and valley values, the process optimizes both formation efficiency and uniformity of recessed portions through controlled parameter variation.
2Manufacturing precision
If voltage is increased slowly to control recessed portion formation, then the uniformity of recessed portions is improved, but the anodization time increases
Solution Approach 1:
The periodic voltage modulation allows the process to achieve uniform recessed portions through controlled formation and dissolution cycles, rather than relying on slow continuous voltage increase. This reduces the overall anodization time while maintaining uniformity.
Solution Approach 2:
The anodization process continues efficiently with periodic voltage changes rather than pausing or increasing voltage slowly. The continuous modulation between peak and valley values maintains productive action throughout the process while ensuring uniform recessed portion formation.
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 method effectively reduces the variation in recessed portions, leading to more consistent antireflection characteristics and improved performance in antireflection elements.
Implementation Method 1
A base is immersed in an acidic electrolytic solution of sulfuric acid, oxalic acid, phosphoric acid, or the like, or an alkaline electrolytic solution, and this is used as an anode in application of a voltage, which causes oxidation and dissolution.
Implementation Method 2
A base is immersed in an acidic electrolytic solution of sulfuric acid, oxalic acid, phosphoric acid, or the like, or an alkaline electrolytic solution, and this is used as an anode in application of a voltage, which causes oxidation and dissolution.
Implementation Method 3
When anodization is performed, bubbles of hydrogen are generated at a cathode immersed in an electrolytic solution.
Data Source
AI summary
An anodized layer formation method includes: providing an aluminum film provided on a support or an aluminum base; and forming a porous alumina layer which has minute recessed portions by applying a voltage between an anode which is electrically coupled to a surface of the aluminum film or the aluminum base and a cathode which is provided in an electrolytic solution with the surface of the aluminum film or the aluminum base being in contact with the electrolytic solution. The forming of the porous alumina layer includes increasing the voltage to a target value and, before the voltage is increased to the target value, increasing the voltage to a first peak value which is lower than the target value and thereafter decreasing the voltage to a value which is lower than the first peak value. As such, an anodized layer with reduced variation of recessed portions can be formed.