FOUP Laser Sensor Positioning for Twist-Free Loadport Alignment
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Solution Overview
Problem
In semiconductor manufacturing, FOUPs mounted twistedly onto EFEMs can cause wafer damage due to improper alignment, leading to scratches during transfer operations, and existing systems lack effective means to accurately determine the orientation and alignment of FOUPs on loadports.
Innovation Solution
A position determination apparatus for a robot detection laser sensor system in FOUPs, incorporating T-axis sensors, Z-axis sensors, and horizontal sensors to detect the transfer path and orientation of the end-effector, which transmits data to a controller for integration management and ensures accurate mounting and operation of wafers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If FOUPs are mounted onto EFEMs without position determination, then mounting operation is simple and fast, but the FOUPs may be mounted twistedly causing wafer damage
Solution Approach 1:
The patent applies preliminary action by determining the position and orientation of the FOUP before the wafer transfer operation begins. The detection laser sensors measure the FOUP's position on the EFEM loadport in advance, allowing the system to verify proper mounting orientation before any wafer handling occurs, thus preventing potential damage while maintaining operational simplicity
Solution Approach 2:
The patent replaces mechanical alignment methods with optical detection using laser sensors. Instead of relying on mechanical guides or physical alignment features, the system uses detection laser sensors to optically measure the FOUP's position and orientation, reducing mechanical complexity while improving mounting accuracy
2Measurement precision
If detection laser sensors are installed to determine FOUP position, then mounting accuracy is improved, but device complexity and installation time increase
Solution Approach 1:
The patent applies segmentation by dividing the detection function into multiple independent laser sensors positioned at different locations. Each sensor independently measures specific position parameters, and their data is integrated to determine overall FOUP orientation. This modular approach improves measurement precision while keeping individual sensor units simple and manageable
Solution Approach 2:
The detection laser sensor system is designed to perform multiple functions: determining FOUP position, verifying mounting orientation, and enabling continuous operation during maintenance. The same sensor infrastructure supports both precision measurement and system diagnostics, reducing overall device complexity despite the added measurement capability
3Productivity
If multiple sensors are installed for continuous operation capability, then productivity is maintained, but device complexity increases
Solution Approach 1:
The patent applies self-service by enabling the sensor system to perform self-diagnosis and status monitoring. The detection laser sensors continuously verify FOUP positioning and can detect mounting errors automatically, allowing the system to maintain productivity by identifying and alerting to issues without external intervention, thus managing complexity through automated self-monitoring
Data Source
AI summary
The present invention relates to a position determination apparatus for a robot detection laser sensor system in front-opening unified pods (FOUPs), including: an external server; and a wafer processing device for performing processing for wafers and transmitting integration management data to the external server, wherein the wafer processing device may include: the FOUPs configured to accommodate the wafers therein; loadports to which the FOUPs are detachably coupled; processing chambers in which the processing for the wafers are performed; and an equipment front end module (EFEM) disposed between the processing chambers and the loadports and having an end-effector adapted to get the wafers out of the FOUPs into the processing chambers or put the wafers finished in processing in the processing chambers into the FOUPs.