Anode Chamber Liquid Level Control for Bubble-Free Plating
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Solution Overview
Problem
Existing plating apparatuses require precise control to maintain the anode solution level below the cathode solution level to prevent depletion and ensure stable plating, as the barrier membrane can separate due to pressure differences, leading to bubble accumulation and inefficiencies.
Innovation Solution
A method of liquid management in the anode chamber involves using a barrier membrane to maintain a lower anode solution level than the cathode, with an exhaust path for bubble discharge and sensors to monitor and replenish the anode solution when necessary, ensuring the anode solution does not mix with the cathode solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the barrier membrane is placed below a frame fixed in the plating tank to separate the anode and cathode chambers, then the plating solution can flow along the substrate surface, but when the cathode chamber pressure becomes higher than the anode chamber pressure, the barrier membrane separates from the frame to form pockets that trap bubbles
Solution Approach 1:
The system uses a liquid level sensor to detect the liquid level in the anode chamber and provides feedback to the control unit, which automatically adjusts the liquid level by controlling the inflow of plating solution or outflow through the overflow path, ensuring the barrier membrane remains in contact with the frame and preventing bubble accumulation
Solution Approach 2:
The system automatically maintains the liquid level in the anode chamber through self-regulating mechanisms where the control unit adjusts the liquid level based on sensor feedback without manual intervention, and the overflow path automatically discharges excess liquid to maintain proper pressure balance
2Reliability
If the liquid level of the anode solution is kept lower than the cathode solution level to prevent barrier membrane separation, then bubble trapping is reduced, but the anode solution may become depleted
Solution Approach 1:
The liquid level sensor continuously monitors the anode solution level and provides feedback to the control unit, which automatically replenishes the solution by controlling the inflow from the plating solution supply, preventing depletion while maintaining the lower liquid level condition
Solution Approach 2:
The system proactively replenishes the anode solution before complete depletion occurs by monitoring the liquid level and initiating inflow when the level drops below a predetermined threshold, ensuring continuous operation without interruption
3Reliability
If precise control is implemented to maintain anode solution level below cathode solution level, then barrier membrane separation is prevented, but the system complexity increases
Solution Approach 1:
The system implements automatic feedback control where the liquid level sensor and control unit work together to maintain the anode solution level below the cathode solution level, eliminating the need for complex manual control procedures while ensuring reliable operation
Solution Approach 2:
The control unit acts as an intermediary between the liquid level sensor and the plating solution supply/overflow systems, automatically coordinating the inflow and outflow to maintain proper liquid level differential without requiring complex external control mechanisms
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 approach stabilizes the plating process by preventing bubble accumulation and maintaining solution integrity, enhancing the uniformity and efficiency of the plating film thickness.
Implementation Method 1
a pressure difference between a cathode chamber and an anode chamber
Implementation Method 2
an exhaust path provided to communicate with the anode chamber and configured to discharge bubbles from the anode chamber to outside of the plating tank
Implementation Method 3
an output of a liquid level sensor placed in the exhaust path
Data Source
AI summary
There is provided a method of liquid management in an anode chamber. The method comprises providing a plating tank that comprises an anode; a barrier membrane placed to come into contact with or to be brought into close contact with an upper face of the anode; a cathode chamber on an upper side and an anode chamber on a lower side parted by the barrier membrane; and an exhaust path provided to communicate with the anode chamber and configured to discharge bubbles from the anode chamber to outside of the plating tank; storing a plating solution in the anode chamber and in the cathode chamber, such that a liquid level of the plating solution in the exhaust path that is a liquid level of the plating solution in the anode chamber is lower than a liquid level of the plating solution in the cathode chamber; determining whether the liquid level of the plating solution in the exhaust path is lower than a predetermined height, based on an output of a liquid level sensor placed in the exhaust path; and supplying pure water or an electrolytic solution to the anode chamber, when it is determined that the liquid level of the plating solution in the exhaust path is lower than the predetermined height.