Load-Lock Consumable Transfer for Vacuum Chamber Uptime
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Solution Overview
Problem
Existing plasma processing systems face inefficiencies due to the need for frequent replacement of consumables like focus rings, which requires downtime and disrupts the operation of the vacuum processing chamber.
Innovation Solution
A system is implemented with an atmospheric-pressure transfer chamber, vacuum processing chambers, load-lock modules, and transfer mechanisms to concurrently replace used and unused consumables in a vacuum environment, minimizing downtime by transferring them through separate atmospheric and vacuum transfer paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If consumables are replaced by loading and unloading them without exposing the processing chamber to atmosphere, then the vacuum environment is maintained, but the replacement process takes time and reduces operation rate
Solution Approach 1:
The system divides the transfer process into two independent paths: a vacuum transfer path for removing used consumables, and an atmospheric transfer path for introducing new consumables. This segmentation allows both operations to occur simultaneously without interfering with each other, resolving the contradiction between maintaining vacuum environment and improving operation rate.
Solution Approach 2:
New consumables are prepared and transferred to the processing chamber in advance through the atmospheric transfer path before the vacuum chamber needs them. This preliminary action ensures that consumable replacement does not require stopping the vacuum processing, thereby maintaining high operation rate while preserving the vacuum environment.
2Device complexity
If consumable replacement is performed sequentially (one at a time), then the process is simple, but the outage time increases
Solution Approach 1:
The transfer system is segmented into parallel vacuum and atmospheric transfer paths, enabling concurrent operation. Multiple consumables can be transferred simultaneously through different paths, dramatically reducing total replacement time while the modular design keeps each individual transfer mechanism relatively simple.
Solution Approach 2:
The system maintains continuous operation by performing consumable replacement activities concurrently with ongoing vacuum processing. The atmospheric transfer path operates independently and continuously, ensuring that consumable replacement does not interrupt the productive vacuum processing, thereby minimizing loss of time.
3Loss of time
If multiple consumables are transferred concurrently through separate paths, then the replacement time is reduced, but the system complexity increases
Solution Approach 1:
The system uses segmented transfer paths (vacuum and atmospheric) that operate independently. Each path has its own transfer mechanism, allowing concurrent operations without complex coordination. This segmentation reduces the complexity of controlling simultaneous transfers compared to a single integrated system.
Solution Approach 2:
The atmospheric transfer chamber serves as an intermediary that buffers and prepares consumables before they are transferred to the vacuum chamber. This intermediary structure simplifies the overall system by decoupling the atmospheric and vacuum environments, allowing independent optimization of each transfer path while reducing total replacement time.
Data Source
AI summary
A system of processing a substrate includes an atmospheric-pressure transfer chamber, at least one vacuum processing chamber, at least two load-lock modules, a vacuum transfer chamber, a plurality of load ports, and a first transfer mechanism and a second transfer mechanism. The load ports are attached to the atmospheric-pressure transfer chamber and detachable containers are mounted on the load ports, respectively. A controller controls the first transfer mechanism and the second transfer mechanism to concurrently transfer a used consumable from the containers to the vacuum processing chamber through the atmospheric-pressure transfer chamber and one of the load-lock modules and to transfer a used consumable from the vacuum processing chamber through the vacuum transfer chamber and another one of the load-lock modules.