Vacuum Chamber Pumping Segmentation for Impurity Control
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Solution Overview
Problem
Existing vacuum chamber methods using roughing and main pumps often contaminate the chamber with impurities, which can degrade the quality of processes like thin film formation and organic light-emitting layer manufacturing.
Innovation Solution
A method involving a mechanical roughing pump to reduce internal pressure below 15 Pa, followed by a non-mechanical main pump, with a controlled transition from rough pumping to main pumping to minimize impurity contamination, using a controller to manage the process and potentially introducing inert gases for precise pressure control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a mechanical roughing pump is used to reduce internal pressure, then the internal pressure can be reduced to below 15 Pa, but impurity contamination occurs in the vacuum chamber
Solution Approach 1:
The evacuation process is divided into two distinct stages: rough pumping stage (using mechanical roughing pump from atmospheric pressure to 15 Pa) and high vacuum pumping stage (using non-mechanical main pump from 15 Pa to final vacuum level). This segmentation allows each pump type to operate in its optimal pressure range, preventing mechanical pump impurities from contaminating the chamber during high vacuum operation
Solution Approach 2:
The rough pumping stage is performed as a preliminary action before activating the main pump. By预先 removing the bulk gas and reducing pressure to 15 Pa first, the conditions are prepared for the main pump to operate effectively without being overwhelmed by atmospheric pressure, and impurity generation is minimized before the sensitive high vacuum phase begins
2Stress or pressure
If a non-mechanical main pump is used for high vacuum, then ultra-high vacuum can be achieved, but the pump cannot operate effectively at atmospheric pressure
Solution Approach 1:
The vacuum system is segmented into two operational phases with distinct pump assignments: the roughing pump handles the atmospheric to 15 Pa range, while the main pump handles the 15 Pa to ultra-high vacuum range. This segmentation allows each pump to operate within its optimal pressure range, with the main pump never exposed to atmospheric pressure conditions where it would be ineffective
Solution Approach 2:
The roughing pump serves as an intermediary device that bridges atmospheric pressure and the high vacuum regime. It prepares the system by reducing pressure to 15 Pa, creating suitable operating conditions for the main pump to then achieve ultra-high vacuum levels without being subjected to atmospheric pressure
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
This approach significantly reduces impurity contamination within the vacuum chamber, maintaining the integrity of the chamber environment and enhancing the performance of processes such as organic light-emitting layer formation by minimizing the impact of impurities from the roughing pump.
Implementation Method 1
rough pumping reducing the internal pressure of the vacuum chamber by using a roughing pump, the roughing pump being a mechanical pump
Implementation Method 2
main pumping reducing the internal pressure of the vacuum chamber by using a main pump after the rough pumping, the main pump being a non-mechanical pump
Data Source
AI summary
A method for reducing an internal pressure of a vacuum chamber while preventing impurity contamination within the vacuum chamber as much as possible is provided. The method includes: rough pumping reducing an internal pressure of a vacuum chamber by using a roughing pump, the roughing pump being a mechanical pump that is capable of reducing the internal pressure of the vacuum chamber to be less than 15 Pa; main pumping reducing the internal pressure of the vacuum chamber by using a main pump after the rough pumping, the main pump being a non-mechanical pump. Transition from the rough pumping to the main pumping is performed when the internal pressure of the vacuum chamber is no less than 15 Pa.