Selectable Bottom Purge for FOUP Contamination Control
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Solution Overview
Problem
Existing electronic device manufacturing systems face challenges in controlling environmental factors such as humidity, oxygen, and chemical contaminants/particles within substrate carriers at load port assemblies of equipment front end modules (EFEMs), which can adversely affect substrate processing.
Innovation Solution
A purge apparatus is introduced for load port assemblies of EFEMs, featuring an exhaust gas line and a delivery gas line with parallel branches and flow control meters, allowing for selectable gas flow rates controlled by a graphical user interface (GUI) and a controller, to replace the gaseous atmosphere in substrate carriers and reduce contaminants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single fixed gas flow rate is used in the purge apparatus, then the system structure remains simple, but the adaptability to different environmental control requirements is poor
Solution Approach 1:
The patent implements dynamic gas flow rate control by providing multiple selectable flow rates (first, second, and third flow rates) that can be changed during operation. The controller switches between different flow rates based on real-time environmental conditions, transforming a static system into a dynamic one that adapts to varying purification requirements without requiring complete system redesign.
Solution Approach 2:
The patent changes the gas flow rate parameter to achieve different purification效果的. By providing multiple predefined flow rate options and allowing dynamic switching between them, the system can adjust the gas flow parameter to match different environmental control requirements, thereby improving adaptability without significantly increasing structural complexity.
2Adaptability or versatility
If multiple gas flow rates are provided with parallel branches and flow control meters, then the adaptability to different environmental requirements is improved, but the device complexity increases
Solution Approach 1:
The gas delivery system is segmented into multiple parallel branches, with each branch equipped with its own flow control meter and valve. This segmentation allows independent control of gas flow rates through different branches, enabling the system to provide multiple selectable flow rates simultaneously and switch between them by controlling which branches are active.
Solution Approach 2:
The parallel branch structure with flow control meters serves multiple functions: it provides different gas flow rates, enables selective gas delivery to different regions, and allows flexible combination of flow rates. This multi-functional design improves adaptability while keeping the added complexity manageable through standardized components.
3Productivity
If real-time switching between different gas flow rates is implemented, then the environmental control responsiveness is improved, but the control system complexity increases
Solution Approach 1:
The controller receives real-time feedback about environmental conditions (humidity, oxygen, contaminants levels) and automatically switches between different gas flow rates to maintain optimal purification. This feedback mechanism enables responsive environmental control without requiring complex manual intervention, as the system self-adjusts based on sensor data.
Solution Approach 2:
The system provides self-service through automated flow rate selection and switching. The controller manages the complexity of coordinating multiple valves and flow control meters, automatically selecting appropriate flow rates based on environmental conditions without requiring operator intervention, thereby simplifying operation despite increased internal complexity.
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 purge apparatus effectively reduces harmful levels of humidity, oxygen, and contaminants, providing improved environmental control for substrate processing by allowing real-time selection of gas flow rates, enhancing the cleanliness and quality of the substrate carrier environment.
Implementation Method 1
a delivery gas line having at least one delivery outlet connected to a second nozzle of the plurality of gas nozzles
Implementation Method 2
The first branch includes a first valve and a first flow control meter, the second branch includes a second valve and a second flow control meter
Implementation Method 3
The purge apparatus effectively reduces harmful levels of humidity, oxygen, and contaminants
Data Source
AI summary
Electronic device manufacturing systems may include an equipment front end module (EFEM) having a load port assembly configured to receiving a substrate carrier, which may be a front opening unified pod (FOUP). The load port assembly may have a receiving plate upon which the substrate carrier may be received. The receiving plate may have a plurality of gas nozzles that can be coupled to purge ports in a bottom of the substrate carrier and to a purge apparatus of the load port assembly. The purge apparatus is configured to provide a gas to the substrate carrier at a selectable gas flow rate and, in some embodiments, to provide a gas to different portions of the substrate carrier each at a selectable gas flow rate. Methods of providing selectable gas flow rates for purging a substrate carrier coupled to a load port assembly are also provided, as are other aspects.