Multi-End-Effector Wafer Handling for Parallel Station Loading
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Solution Overview
Problem
Existing wafer processing systems face inefficiencies in throughput and resource utilization due to the need for multiple robotic arms or complex mechanisms for handling multiple wafers, leading to increased complexity and potential failure points.
Innovation Solution
A system utilizing a single robotic arm with multiple end effectors to simultaneously transfer and process multiple wafers across multiple stations, enabling resource sharing and simplified construction by reducing moving parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single robotic arm with multiple end effectors is used to transfer multiple wafers simultaneously, then throughput increases and system complexity reduces, but the robotic arm must perform more complex coordinated movements to handle multiple wafers at once
Solution Approach 1:
The robotic arm is divided into multiple independent end effectors (first, second, and third end effectors) that can be controlled independently. Each end effector can pick up and transfer wafers separately, allowing parallel operations while maintaining individual control simplicity. This segmentation enables the system to handle multiple wafers simultaneously without requiring the entire robotic arm to perform complex coordinated movements as a single unit.
Solution Approach 2:
The robotic arm is designed with multi-functionality to perform multiple wafer transfer operations simultaneously using different end effectors. The same robotic arm structure serves multiple purposes by accommodating several end effectors that can operate in parallel, transferring wafers from the storage unit to different processing stations at the same time, thereby increasing throughput without adding multiple separate robotic arms.
2Productivity
If multiple robotic arms are used to handle multiple wafers, then throughput increases, but the number of moving parts increases leading to more failure points and higher system complexity
Solution Approach 1:
Multiple robotic arm functions are merged into a single robotic arm by integrating multiple end effectors onto one arm structure. This consolidation allows the system to maintain the throughput benefits of having multiple wafer handling capabilities while reducing the total number of robotic arms and their associated moving parts. The single robotic arm with multiple end effectors eliminates the need for multiple independent robotic arms, thereby reducing failure points and improving reliability.
Solution Approach 2:
The single robotic arm is designed with universal multi-functionality to perform multiple wafer transfer operations that would traditionally require multiple separate robotic arms. By making the robotic arm multi-functional through the addition of multiple end effectors, the system achieves high throughput while maintaining a reduced component count, which directly improves reliability by eliminating redundant moving parts.
3Ease of manufacture
If a single robotic arm with multiple end effectors is used, then resource sharing is improved and construction is simplified, but each end effector must be precisely positioned to avoid interference during wafer transfer
Solution Approach 1:
The end effectors are segmented and positioned at different locations along the robotic arm, with each end effector assigned to specific processing stations. This spatial segmentation reduces interference between end effectors during wafer transfer operations. The first end effector can transfer wafers to the first processing station while the second and third end effectors simultaneously transfer wafers to other stations, eliminating the need for complex real-time coordination and reducing positioning precision requirements.
Solution Approach 2:
The end effectors are arranged in a spatial distribution along the robotic arm, utilizing the dimensional space available on the arm structure. By distributing end effectors across different positions and orientations in three-dimensional space, the system allows simultaneous wafer transfers to multiple processing stations without interference. This spatial arrangement simplifies construction by avoiding complex mechanical interference mechanisms while maintaining operational independence.
Data Source
AI summary
A system for processing wafer-shaped articles, the system comprising: three or more processing stations; and a robotic arm comprising a first set of end effectors including three or more end effectors; wherein the robotic arm is configured to pick up, from a storage unit configured to store a plurality of wafer-shaped articles, a respective wafer-shaped article with each of the three or more end effectors, and load one of the respective wafer-shaped articles into each of the three or more processing stations.