Load Port Corrosive Gas Detection Sensor Placement
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Solution Overview
Problem
In semiconductor manufacturing, load port apparatuses face challenges in preventing damage to housed objects and peripheral devices from corrosive gases such as chlorine, bromine, and ammonia, which can accumulate in pods and flow out, affecting the quality of the objects and components.
Innovation Solution
A load port apparatus equipped with a mounting unit, a frame opening, a door mechanism, an inner gas exhaust unit, and a corrosive gas detection sensor to detect and manage corrosive gas concentrations, allowing for targeted cleaning processes to prevent gas accumulation and leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cleaning gas is introduced from the load port apparatus to prevent oxidation in the pod, then the housed object is protected from oxidation, but corrosive gases cannot be removed efficiently and may accumulate and damage the housed object or peripheral devices
Solution Approach 1:
A corrosive gas detection sensor is introduced as an intermediary device between the pod interior and the external environment. The sensor detects corrosive gases (chlorine, bromine, fluorine, ammonia, or their ions) that may accumulate in the pod, providing early warning before these gases can damage the housed object or peripheral devices. This mediator enables monitoring and intervention without directly interfering with the cleaning gas function.
Solution Approach 2:
The detection sensor provides feedback about the corrosive gas concentration in the pod to the control system. Based on this feedback, the system can adjust the cleaning gas flow rate or activate exhaust mechanisms to remove corrosive gases when their concentration exceeds safe thresholds, while maintaining protective atmosphere when concentrations are low. This feedback loop resolves the contradiction by enabling dynamic adjustment of gas management.
2Object-affected harmful factors
If the door is kept closed to prevent corrosive gas leakage from the pod, then peripheral devices are protected from gas damage, but the housed object cannot be transferred to or from the processing chamber
Solution Approach 1:
The detection sensor continuously monitors corrosive gas levels and provides feedback to the control system. When corrosive gases are detected above threshold levels, the system automatically closes the door to prevent leakage to peripheral devices. When gas levels are safe, the door can remain open or be opened for transfer operations. This feedback-based control enables automatic door management that balances protection and productivity.
Solution Approach 2:
The system performs preliminary detection of corrosive gases before they reach dangerous concentrations. By detecting gases early and taking preventive action (closing the door, activating exhaust), the system prevents the need for frequent door closures due to gas accumulation, thereby maintaining higher transfer efficiency while still protecting peripheral devices when necessary.
3Measurement precision
If the corrosive gas detection sensor is arranged close to the frame opening to detect pod gas concentration, then accurate detection is achieved, but the door movement may interfere with the sensor operation
Solution Approach 1:
The detection sensor is mounted on the door itself rather than on a fixed structure. As the door moves between open and closed positions, the sensor moves with it, maintaining its optimal detection position relative to the pod opening. This dynamic mounting ensures continuous accurate detection of corrosive gases while eliminating interference from door movement, as the sensor and door move together as a unified system.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The apparatus effectively prevents damage by accurately detecting corrosive gas concentrations and performing cleaning processes, ensuring the safety of housed objects and peripheral devices by controlling gas flow and concentration within the pod.
Implementation Method 1
a corrosive gas detection sensor arranged between the frame opening and the inner gas exhaust unit or in an exhaust flow path of the inner gas exhaust unit
Implementation Method 2
an inner gas exhaust unit provided below an inner side of the frame opening to exhaust a gas from an inside of a mini environment connected to the pod through the main opening and the frame opening
Data Source
AI summary
Provided is a load port apparatus including: a mounting unit on which a pod housing a housed object is mounted; a frame portion provided to stand adjacent to the mounting unit and having a frame opening to which a main opening of the pod is connected; a door engageable with a lid for the main opening of the pod for opening and closing the frame opening and the main opening; a door drive mechanism which drives the door; an inner gas exhaust unit provided below an inner side of the frame opening to exhaust a gas from an inside of a mini environment connected to the pod through the main opening and the frame opening; and a corrosive gas detection sensor arranged between the frame opening and the inner gas exhaust unit or in an exhaust flow path of the inner gas exhaust unit.