Circular Substrate Transfer Layout for High-Throughput Load Locks
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Solution Overview
Problem
Semiconductor and display manufacturing processes face challenges in increasing throughput due to limited space constraints, making it difficult to expand facilities and optimize substrate processing efficiency.
Innovation Solution
A substrate transfer apparatus with a moving plate that allows for circular motion of robot arms, reducing the lateral width and enabling efficient substrate transfer between processing chambers and load lock chambers, thereby maximizing throughput in a compact setup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of apparatuses is increased to improve throughput, then productivity is improved, but the area occupied increases
Solution Approach 1:
The patent transitions from linear arrangement to circular arrangement of processing chambers around a central load lock chamber. The robot arm moves along a circular path instead of a linear path, changing the spatial dimension of substrate transfer. This circular configuration allows multiple processing chambers (first, second, third, and fourth chambers) to be accessed from a single load lock chamber, effectively increasing throughput without proportionally increasing the area occupied.
Solution Approach 2:
The single load lock chamber serves multiple functions by being able to transfer substrates to and from all four processing chambers. The robot arm with multiple degrees of freedom can perform multiple transfer operations (first chamber to load lock, second chamber to load lock, third chamber to load lock, fourth chamber to load lock) using the same load lock chamber and robot arm mechanism, making the system more compact while maintaining high throughput.
2Area of stationary object
If the lateral width of the moving plate is reduced to minimize area, then the area occupied is reduced, but the complexity of arm motion paths increases
Solution Approach 1:
The patent employs a circular motion path for the robot arm instead of a linear or rectangular path. The moving plate provides a circular path along which the robot arm transfers substrates between processing chambers and the load lock chamber. This curved/circular trajectory allows the robot arm to access all four processing chambers arranged around the load lock chamber within a compact lateral width, reducing the overall footprint while managing the complexity of motion through geometric optimization.
3Productivity
If multiple processing chambers are disposed in a limited space to improve throughput, then productivity is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple processing chambers (first, second, third, and fourth chambers) around a single central load lock chamber in a circular arrangement. Instead of having separate load lock chambers for each processing chamber, the system merges the substrate transfer function into one centralized load lock chamber. The robot arm integrates the function of transferring substrates to and from all four chambers, reducing the overall number of components and simplifying the apparatus configuration while maintaining high throughput capability.
Data Source
AI summary
A substrate transfer apparatus includes a moving plate, a load lock chamber disposed at one end of the moving plate, a plurality of processing chambers disposed in a longitudinal direction at opposite ends of the moving plate, and a first arm that is connected with the moving plate and that transfers a substrate between one processing chamber among the plurality of processing chambers and the load lock chamber. The moving plate provides a first path along which a first pivot axis of the first arm performs a circular motion on the moving plate.