Electrode Orientation Adjustment Mechanism for Plasma Reactors
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Solution Overview
Problem
Capacitively coupled RF plasma reactors face challenges in maintaining precise parallelism between electrodes due to increased complexity, leading to high costs and time-consuming adjustment processes that are vulnerable to shifting over time.
Innovation Solution
A mechanism for adjusting electrode orientation in a plasma processing chamber using a support plate and adjustment screw system that allows for precise rotation of the lower electrode in pitch and roll directions, enabling accurate parallelism adjustment without disassembly and providing calibrated feedback for precise locking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If tight manufacturing tolerances are used to maintain parallelism, then manufacturing precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent applies the dynamics principle by providing a mechanism that allows the lower electrode assembly to be dynamically adjusted for parallelism. The support plate can be rotated about the substrate insertion axis, and the electrode position can be adjusted relative to the support plate, transforming a static fixed-tolerance design into a dynamic adjustable system that achieves precision without requiring tight manufacturing tolerances on all components.
2Ease of operation
If adjustment mechanisms are added to enable parallelism adjustment, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the parallelism adjustment into two independent segments: (1) rotation of the support plate about the substrate insertion axis to adjust electrode orientation, and (2) adjustment of the electrode position relative to the support plate. This segmentation allows each adjustment function to be controlled independently through simple mechanical means, improving ease of operation while keeping the overall mechanism relatively simple.
3Ease of operation
If slots or clearance holes are used for adjustment, then ease of operation is improved, but manufacturing precision decreases due to free play
Solution Approach 1:
The patent applies feedback by incorporating calibrated index marks on the support plate that provide visual feedback to the operator during adjustment. The index marks allow the operator to see the exact amount of rotation and positioning being applied, enabling precise control of the electrode orientation and position without relying on free play in slots or clearance holes. This feedback mechanism ensures manufacturing precision while maintaining ease of operation.
4Manufacturing precision
If iterative adjustment processes are used, then manufacturing precision is improved, but loss of time increases
Solution Approach 1:
The patent applies preliminary action by pre-calibrating the index marks on the support plate to correspond to specific rotation angles and electrode positions. This preliminary calibration allows the operator to achieve the correct parallelism specification in a single adjustment action rather than requiring iterative trial-and-error adjustments. The pre-marked positions guide the operator directly to the correct setting, significantly reducing adjustment time while maintaining precision.
5Adaptability or versatility
If adjustment mechanisms are added, then adaptability is improved, but reliability decreases due to vulnerability to vibration-induced shifting
Solution Approach 1:
The patent applies beforehand cushioning by incorporating a locking mechanism that secures the support plate and electrode assembly in their adjusted positions. This locking mechanism prevents vibration-induced shifting by mechanically constraining the adjustable components, providing beforehand protection against the reliability issue of adjustment drift. The cushioning effect is achieved through the mechanical lock that absorbs and resists vibrational forces that might otherwise cause the adjustment to shift.
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
Enables precise electrode parallelism adjustment with minimal system downtime, reducing the need for tight manufacturing tolerances and maintaining settings through vibrations and shipping loads, thus optimizing process performance cost-effectively.
Implementation Method 1
The support plate may have a first thread. The mechanism may also include an adjustment screw having a second thread that engages the first thread. Turning the adjustment screw may cause translation of a portion of the support plate relative to the adjustment screw.
Data Source
AI summary
A mechanism for adjusting an orientation of an electrode in a plasma processing chamber is disclosed. The plasma processing chamber may be utilized to process at least a substrate, which may be inserted into the plasma processing chamber in an insertion direction. The mechanism may include a support plate disposed outside a chamber wall of the plasma processing chamber and pivoted relative to the chamber wall. The support plate may have a first thread. The mechanism may also include an adjustment screw having a second thread that engages the first thread. Turning the adjustment screw may cause translation of a portion of the support plate relative to the adjustment screw. The translation of the portion of the support plate may cause rotation of the support plate relative to the chamber wall, thereby rotating the electrode with respect to an axis that is orthogonal to the insertion direction.