Plasma Gas Supply Layout for Fast Switching With Fewer Flow Controllers
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Solution Overview
Problem
Existing gas supply apparatuses for plasma processing require multiple flow rate control valves, which are expensive and increase production costs, while reducing their number compromises high-speed processing gas switching capabilities.
Innovation Solution
A gas supply apparatus with a reduced number of flow rate controllers in upstream pipes, utilizing branching pipes and switching sections near the chamber for high-speed processing gas switching, allowing for efficient flow rate control through upstream controllers and minimizing pressure fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple flow rate control valves are provided in each gas supply pipe, then flow rate control precision is improved, but device cost increases
Solution Approach 1:
The gas supply system is segmented into multiple independent gas supply pipes, each capable of supplying different processing gases to different regions of the chamber. By providing flow rate control valves at strategic points in each pipe rather than at every branching point, the system achieves precise flow control while reducing the total number of valves required.
Solution Approach 2:
Each gas supply pipe is designed to serve multiple functions: supplying different processing gases to different chamber regions and supporting different plasma processing modes (central part processing, outer peripheral part processing, and combined processing). This multi-functionality reduces the need for separate control valves at each potential gas supply point.
2Ease of manufacture
If the number of flow rate control valves is reduced, then device cost decreases, but gas switching speed deteriorates
Solution Approach 1:
The system prepares multiple gas supply paths in advance, with each pipe pre-configured for specific gas types and flow rates. Flow rate control valves are positioned upstream to pre-regulate gas flow before distribution, enabling rapid switching between different gas configurations without requiring multiple valves at each downstream point.
Solution Approach 2:
The gas supply system is designed with dynamic switching capability through strategically placed flow rate control valves that can rapidly adjust flow rates. The pipe configuration allows dynamic reconfiguration of gas supply paths, enabling high-speed switching between different processing gas modes while maintaining cost-effectiveness.
3Manufacturing precision
If flow rate control valves are placed at every gas supply point, then flow rate control precision is improved, but device complexity increases
Solution Approach 1:
The system segments the gas supply network into distinct pipes for different processing gas types and chamber regions. Flow rate control is implemented at key segmentation points rather than at every individual supply point, reducing component count while maintaining precise control over each segment's gas flow.
Solution Approach 2:
Multiple gas supply functions are merged into integrated pipe systems where a single flow rate control valve manages flow for multiple downstream points. The pipe network design allows one valve to effectively control gas distribution across several regions by leveraging the physical layout and pressure dynamics of the system.
Data Source
AI summary
A gas supply apparatus includes: supply source pipes; upstream pipes branched from the supply source pipes and corresponding to supply points in a chamber; flow rate controllers provided in the respective upstream pipes, midstream pipes branched from the upstream pipes and corresponding to processing steps performed in the chamber; valves provided in the respective midstream pipes; downstream pipes into which midstream pipes corresponding to the same supply point and the same processing step merge; outflow pipes which are connected to downstream pipes corresponding to the same supply point through a switching section, and each of which is connected to one of the supply points; and a control unit that controls the switching section so that the downstream pipes in fluid communication with the outflow pipes are switched according to the processing steps.