Substrate Exhaust System Segmentation for Gas Contamination Control
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Solution Overview
Problem
Existing substrate processing systems face challenges in effectively managing and separating exhaust gases from different processing liquids, leading to potential air pollution and contamination risks due to the mixing of volatile organic compounds and other gases.
Innovation Solution
A substrate processing apparatus with a sophisticated exhaust unit that includes multiple individual exhaust pipes and a switching mechanism to selectively direct exhaust gases, utilizing a main exhaust pipe with separate portions and switching mechanisms to block or allow flows based on the type of exhaust gas, and introducing outside air to suppress incorrect gas flows, ensuring efficient gas separation and minimization of contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single exhaust pipe is used for all processing liquids, then the device complexity is reduced, but exhaust gases from different processing liquids mix together causing contamination and air pollution
Solution Approach 1:
The exhaust system is divided into multiple individual exhaust pipes, each dedicated to a specific processing liquid type. The main exhaust pipe is segmented into multiple portions with switching mechanisms that can selectively connect to individual exhaust pipes, preventing mixing of exhaust gases from different processing liquids while maintaining manageable system complexity.
Solution Approach 2:
Switching mechanisms act as intermediaries between the main exhaust pipe and individual exhaust pipes. These switching mechanisms selectively connect or disconnect specific exhaust pipes based on the processing liquid being used, ensuring that exhaust gases are directed to the appropriate pipe without mixing with gases from other processing liquids.
2Manufacturing precision
If switching mechanisms are added to separate exhaust pipes, then exhaust gas separation precision is improved, but the device complexity increases
Solution Approach 1:
The switching mechanisms are designed to dynamically change the flow path configuration based on the processing liquid being used. The switching mechanisms can be opened or closed to connect or disconnect individual exhaust pipes from the main exhaust pipe, providing adaptive exhaust gas separation that matches the processing requirements without requiring a completely separate exhaust system for each liquid type.
3Object-generated harmful factors
If the exhaust system is designed for complete gas separation, then contamination risk is reduced, but the ease of operation decreases due to complex switching control
Solution Approach 1:
The switching mechanisms are configured to automatically switch between different exhaust pipe connections based on the processing liquid being supplied to the substrate. The system can self-regulate the exhaust flow paths without requiring manual intervention, reducing operational complexity while maintaining effective gas separation and minimizing contamination risk.
Data Source
AI summary
A substrate processing apparatus includes a liquid processing unit configured to supply, onto a front surface of a substrate, individual multiple processing liquids different from each other; an exhaust unit configured to exhaust an exhaust gas exhausted from the liquid processing unit to an outside. The exhaust unit includes a main exhaust pipe including a first portion and a second portion, a first individual exhaust pipe, a second individual exhaust pipe, a switching unit and an outside air introduction pipe. The switching unit includes a first switching mechanism, a second switching mechanism, a third switching mechanism provided between the first portion and the second portion of the main exhaust pipe, an outside air introduction pipe connected to the second portion to allow outside air to be introduced into the second portion, and a fourth switching mechanism provided in the outside air introduction pipe.