Substrate Holder Biasing Mechanism for Plating Seal Integrity
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Solution Overview
Problem
The increasing size of substrates in plating apparatuses leads to pressure differences that cause variations in the compressed substrate sealing member, resulting in potential leakage and quality issues with the plating process, which existing configurations fail to address effectively.
Innovation Solution
A substrate holder design featuring a first holding member with a support base and a movable base, and a biasing mechanism that applies varying biasing forces to different regions of the movable base to counteract fluid pressure differences, ensuring consistent seal compression and preventing substrate inclination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the substrate holder size is increased to accommodate larger substrates, then the substrate treatment capacity is improved, but a pressure difference is generated between upper and lower portions due to fluid pressure, causing variation in seal compression and potential leakage
Solution Approach 1:
The biasing mechanism applies different biasing forces to different regions of the movable base according to their respective positions. Specifically, regions experiencing greater fluid pressure (typically lower portions) receive stronger biasing forces, while regions experiencing lesser pressure receive weaker biasing forces. This local differentiation compensates for the pressure difference and maintains uniform seal compression across the entire substrate holder.
Solution Approach 2:
The invention changes the biasing force parameter spatially across the movable base. By adjusting the magnitude of biasing force applied to different regions based on their position, the system compensates for variations in fluid pressure. This parameter modification ensures that the net force on the seal remains consistent throughout, preventing leakage and maintaining reliability despite the increased holder size.
2Area of stationary object
If the substrate holder size is increased to accommodate larger substrates, then the substrate treatment capacity is improved, but substrate inclination occurs due to pressure difference, affecting plating quality
Solution Approach 1:
The biasing mechanism implements local quality by applying position-dependent biasing forces to different regions of the movable base. Regions that would experience greater fluid pressure and thus greater tendency toward inclination receive stronger compensating biasing forces. This localized force adjustment prevents substrate inclination and ensures uniform plating quality across the entire large substrate surface.
Solution Approach 2:
The biasing mechanism performs preliminary anti-action by applying counteracting forces before the fluid pressure can cause significant substrate inclination. The biasing forces are pre-configured to oppose the expected pressure distribution, preventing the harmful effect of inclination from occurring in the first place, thereby maintaining high manufacturing precision in the plating process.
3Device complexity
If a uniform biasing force is applied to the movable base, then the structure is simple, but it cannot compensate for the pressure difference in large substrate holders, leading to seal leakage
Solution Approach 1:
The biasing mechanism transitions from a simple uniform force application to a localized differentiated force application. Each region of the movable base receives a biasing force tailored to its specific position and pressure conditions. This local quality approach maintains reliability by ensuring consistent seal compression across all regions, justifying the increased structural complexity through improved performance.
Solution Approach 2:
The biasing mechanism is segmented into multiple independent force application points or regions, each capable of providing customized biasing forces. This segmentation allows the system to address the spatially varying pressure distribution effectively, with each segment contributing to the overall compensation strategy, thereby maintaining seal integrity across the entire substrate holder.
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 prevents leakage and ensures uniform plating by maintaining consistent seal compression and substrate alignment, even with large-sized substrates, thereby enhancing the quality and reliability of the plating process.
Implementation Method 1
a biasing mechanism disposed between the support base and the movable base, and configured to bias the movable base in a direction along which the movable base is separated from the support base
Data Source
AI summary
Provided is a substrate holder where an effect of a pressure of a plating solution can be suppressed. A substrate holder includes first and second holding members for sandwiching a substrate. The first holding member includes: a support base; a movable base for supporting the substrate; and a biasing mechanism disposed between the support base and the movable base, and biasing the movable base in a direction along which the movable base is separated from the support base. The second holding member includes a protruding portion brought into contact with the substrate so as to seal the substrate. A biasing force of the biasing mechanism which is applied to a region or a position of the movable base differs from a biasing force of the biasing mechanism which is applied to another region or at another position of the movable base.