Plasma Chamber Electrode Parallelism Control via Thermal Resistance
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Solution Overview
Problem
Plasma processing systems face challenges in maintaining precise electrode-to-electrode parallelism due to temperature variations and differing thermal properties of components, leading to costly manufacturing tolerances and time-consuming adjustment processes that are vulnerable to shifts over time.
Innovation Solution
A plasma processing system with thermally resistive coupling mechanisms and insulation to control temperature variations, allowing for precise adjustment of electrode-to-electrode parallelism using low-cost parts and minimizing the need for tight manufacturing tolerances, while enabling adjustments under vacuum or in-situ without frequent disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If tight manufacturing tolerances are used to maintain electrode parallelism, then parallelism precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent introduces adjustable spacing mechanisms that allow the distance between electrodes to be modified after manufacturing, replacing the need for tight manufacturing tolerances with post-manufacturing parameter adjustment. This enables parallelism control through mechanical adjustment rather than precision manufacturing.
Solution Approach 2:
The patent employs dynamic adjustment mechanisms including threaded rods, cams, and movable support structures that allow electrode spacing to be adjusted during assembly and maintenance. This transforms a static precision manufacturing problem into a dynamic adjustment problem, achieving parallelism without tight manufacturing tolerances.
2Manufacturing precision
If adjustment mechanisms are added to control electrode parallelism, then parallelism precision is improved, but device complexity increases
Solution Approach 1:
The patent divides the electrode support structure into separate adjustable modules, where each electrode can be independently positioned and adjusted. This segmentation allows parallelism control without requiring complex integrated adjustment mechanisms across the entire assembly.
Solution Approach 2:
The patent introduces intermediary adjustment components such as threaded rods, cams, and lever mechanisms that mediate between simple user inputs and the precise electrode positioning required. These intermediaries translate simple rotational or linear motions into precise electrode spacing adjustments.
3Ease of operation
If adjustments are performed at room temperature, then ease of operation is improved, but parallelism accuracy deteriorates due to thermal expansion
Solution Approach 1:
The patent incorporates temperature compensation features and pre-adjustment mechanisms that account for thermal expansion before the system operates at high temperature. Adjustments are made with thermal compensation in mind, or the system is pre-heated to operating temperature before final parallelism adjustments are made.
Solution Approach 2:
The patent designs adjustment mechanisms that operate correctly across temperature ranges, using materials and mechanical designs that compensate for thermal expansion. The adjustment parameters are selected to maintain parallelism despite temperature-induced dimensional changes in the electrode and support structures.
4Manufacturing precision
If iterative adjustment processes are used to achieve parallelism, then parallelism precision is improved, but time consumption increases
Solution Approach 1:
The patent incorporates feedback mechanisms such as alignment marks, indicators, and measurement references that provide immediate visual or mechanical feedback during adjustment. This allows operators to achieve parallelism in fewer iterations by knowing the current state and the direction of adjustment needed.
Solution Approach 2:
The patent includes pre-positioning features, alignment guides, and preset adjustment ranges that narrow down the adjustment space before fine-tuning is required. This preliminary action reduces the number of iterative adjustments needed to achieve final parallelism.
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 system achieves accurate and long-lasting electrode-to-electrode parallelism adjustments with reduced costs and operational complexity, protecting components from thermal issues and maintaining optimal process performance.
Implementation Method 1
thermally resistive coupling mechanisms for mechanically coupling the lift plate with the support plate
Data Source
AI summary
A plasma processing system with improved component temperature control is disclosed. The system may include a plasma processing chamber having a chamber wall. The system may also include an electrode disposed inside the plasma processing chamber. The system may also include a support member disposed inside the plasma processing chamber for supporting the electrode. The system may also include a support plate disposed outside the chamber wall. The system may also include a cantilever disposed through the chamber wall for coupling the support member with the support plate. The system may also include a lift plate disposed between the chamber wall and the support plate. The system may also include thermally resistive coupling mechanisms for mechanically coupling the lift plate with the support plate.