Substrate Transfer Footprint Reduction via Asymmetric Gate Valve Extraction
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Solution Overview
Problem
Conventional substrate transfer apparatuses with multiple vacuum transfer chambers connected through an intermediate chamber have a large footprint, increasing the overall size of the processing system due to the need for gate valves at both ends of the intermediate chamber, which hinders efficient wafer transfer and scalability.
Innovation Solution
A substrate transfer apparatus with multiple vacuum transfer chambers connected through an intermediate chamber, where only one gate valve is provided for the second substrate loading/unloading port between the first and second ports, and the ports have different height positions, allowing for reduced footprint by eliminating unnecessary gate valves and optimizing chamber arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gate valves are provided at both ends of the intermediate chamber, then vacuum isolation between chambers is ensured, but the footprint of the substrate transfer apparatus increases
Solution Approach 1:
The patent extracts one gate valve from the intermediate chamber configuration, providing gate valves only at the first substrate loading/unloading port while the second port operates without a gate valve. This selective removal reduces the footprint while maintaining vacuum isolation where most critical.
Solution Approach 2:
The patent introduces asymmetry in the gate valve arrangement by placing gate valves at different positions (only at the first port) rather than symmetrically at both ends of the intermediate chamber. This asymmetric configuration optimizes space utilization while preserving essential vacuum isolation functions.
2Reliability
If multiple gate valves are installed in the intermediate chamber, then chamber isolation is improved, but the complexity of the apparatus increases
Solution Approach 1:
The patent extracts unnecessary gate valves from the intermediate chamber, retaining only the essential gate valve at the first substrate loading/unloading port. This reduction eliminates redundant components while maintaining sufficient chamber isolation for reliable operation.
3Productivity
If the substrate transfer apparatus is scaled down, then productivity is improved, but vacuum isolation may be compromised
Solution Approach 1:
The patent removes redundant gate valves to scale down the apparatus footprint, achieving more compact wafer transfer. The remaining gate valve configuration maintains sufficient vacuum isolation for reliable operation while enabling better space utilization and productivity.
Data Source
AI summary
A substrate transfer apparatus for transferring a substrate includes a plurality of vacuum transfer chambers, each having therein a substrate transfer mechanism for holding and transferring the substrate, and an intermediate chamber disposed between the vacuum transfer chambers adjacent to each other. When one of the vacuum transfer chambers adjacent to each other is set as a first vacuum transfer chamber and the other is set as a second vacuum transfer chamber, a first substrate loading/unloading port is disposed between the intermediate chamber and the first vacuum transfer chamber and a second substrate loading/unloading port is disposed between the intermediate chamber and the second vacuum transfer chamber. A gate valve is provided only for the second substrate loading/unloading port. Further, the first and the second substrate loading/unloading port have different height positions.