Substrate Transfer Arm Layout for Narrower Wafer Handling Footprints
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Solution Overview
Problem
Current semiconductor and display processing equipment has limitations in maximizing throughput due to constraints in the movement and positioning of robot arms within the substrate transfer apparatus, particularly in minimizing the lateral width to increase the number of wafers processed per unit time.
Innovation Solution
The substrate transfer apparatus is designed to enable the arm to move in various directions, including lateral, longitudinal, and oblique paths, with pivot axes positioned based on the target processing chamber, allowing for efficient substrate transfer and minimizing the footprint of the moving plate to increase throughput in limited spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the robot arm is constrained to move only in fixed directions, then the structural design is simpler, but the lateral width cannot be minimized and throughput is limited
Solution Approach 1:
The patent applies the dynamics principle by making the pivot axis of the robot arm movable along a lateral path instead of being fixed. This allows the arm to dynamically adjust its rotation point to optimally position substrates between processing chambers, enabling more compact lateral arrangement of chambers and improving throughput without excessive complexity
Solution Approach 2:
The movement mechanism is segmented into independent functional components: the movable pivot axis that travels laterally, the robot arm that rotates and extends, and the substrate holder. This segmentation allows each component to perform its specific function efficiently while maintaining overall system simplicity
2Productivity
If the moving plate occupies more lateral space, then more processing chambers can be accommodated, but the apparatus footprint increases and space utilization decreases
Solution Approach 1:
The patent transitions from a static, two-dimensional arrangement of processing chambers to a dynamic three-dimensional configuration by adding lateral movement of the pivot axis. This enables the system to access more processing chambers within a reduced lateral footprint by utilizing the additional degree of freedom in the lateral direction
Solution Approach 2:
The system changes the positional parameter of the pivot axis dynamically to optimize substrate transfer efficiency. By varying the lateral position of the pivot axis, the system can accommodate different chamber configurations and minimize the required lateral width while maintaining high throughput
3Productivity
If the arm uses complex multi-directional movement paths, then substrate transfer efficiency is improved, but the mechanism becomes more complex and harder to control
Solution Approach 1:
The robot arm mechanism is designed with multi-functionality, where the combination of the laterally movable pivot axis and the arm's rotation/extension capabilities enables the same mechanism to perform multiple substrate transfer tasks between different processing chambers, achieving high transfer efficiency without requiring separate mechanisms for each task
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 an 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 arm linearly moves in a lateral direction on the moving plate.