Load Port Opening Control for FOUP Lid Separation Stability
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Solution Overview
Problem
The high-speed operation of load ports in semiconductor manufacturing leads to friction and sticking issues between the FOUP body and seal member, causing the lid to float up, resulting in misalignment and collision of wafers, and potentially halting the entire transfer device due to sensor errors.
Innovation Solution
A load port control unit executes multiple operation procedures to ensure reliable separation of the FOUP body and lid, including slower speeds, intermittent movements, and up-down operations, preventing floating and collisions, and integrating sensors to detect abnormal placements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the load port operates at high speed to improve productivity, then the processing efficiency is improved, but friction and sticking occur between the FOUP body and seal member causing the lid to float up
Solution Approach 1:
The patent applies dynamics by making the stage movement speed variable rather than constant. The stage drive mechanism adjusts speed dynamically during the opening operation - moving quickly during normal operation but slowing down when separation is detected or when abnormality is detected, allowing the system to adapt to different operational states and prevent floating up
Solution Approach 2:
The patent changes the operational parameters by introducing multiple operation procedures with different speed profiles. The load port control unit switches between normal operation mode (higher speed) and abnormality handling mode (lower speed with intermittent movements), changing the physical parameters of motion to prevent sticking and floating up
2Productivity
If the lid and FOUP body are separated quickly to maintain high-speed operation, then productivity is improved, but wafer misalignment and collision occur due to lid floating up
Solution Approach 1:
The patent applies beforehand cushioning by detecting placement abnormalities before they cause wafer misalignment or collision. The sensor detects when the FOUP body floats up, and the control unit responds by slowing down or reversing the stage movement, preventing the harmful effect of wafer collision before it occurs
Solution Approach 2:
The patent implements feedback through sensors that detect the placement state of the FOUP body on the stage. This feedback information is used by the load port control unit to adjust the stage drive mechanism's operation in real-time, ensuring wafer alignment is maintained by preventing floating up that would cause misalignment
3Productivity
If the stage moves rapidly to undock position to maintain efficiency, then productivity is improved, but sensor errors occur causing device stoppages
Solution Approach 1:
The patent applies dynamics by making the stage movement speed variable rather than constant. The stage drive mechanism adjusts speed dynamically during the opening operation - moving quickly during normal operation but slowing down when separation is detected or when abnormality is detected, allowing the system to adapt to different operational states and prevent floating up
Data Source
AI summary
A load port control unit performs an opening operation of a sealable container according to a first operation procedure when a sensor has detected a normal placement of the sealable container, and retries the opening operation according to a second operation procedure for being able to more reliably perform the opening operation of the sealable container, to prevent a transfer device from stopping, when the sensor has detected a placement abnormality of the sealable container.