Movable Shield Gas Partial Pressure Control in Vacuum Chamber
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Solution Overview
Problem
Vacuum processing apparatuses face challenges in maintaining stable gas partial pressures, particularly water vapor pressure, which affects the quality of deposition processes in physical vapor deposition, leading to process drift and inconsistent film properties.
Innovation Solution
A vacuum processing apparatus with a cooling surface and movable shields to control gas partial pressures, allowing for condensation of gases and adjustment of the fluid path within the vacuum chamber, enabling precise control of water vapor pressure through a motor-driven system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cooling surface is introduced to condense water vapor and control partial pressure, then gas partial pressure controllability is improved, but device complexity increases due to additional components like movable shields and fluid path adjustment mechanisms
Solution Approach 1:
A movable shield is introduced as an intermediary component between the processing area and the cooling surface. This shield acts as a controllable mediator that can be positioned to either expose or shield the processing area from the cooling surface, thereby controlling the condensation of water vapor and the resulting partial pressure without requiring direct integration of complex control systems into the cooling surface itself
Solution Approach 2:
The shield is designed to be movable rather than fixed, allowing dynamic adjustment of the fluid path between the processing area and cooling surface. This dynamic configuration enables flexible control of water vapor condensation rates, permitting the system to adapt partial pressure control to different process requirements while maintaining a relatively simple overall device architecture
2Manufacturing precision
If frequent preventative maintenance or pre-sputtering is performed to prevent process drift, then deposition quality is improved, but productivity decreases due to additional processing time and operational interruptions
Solution Approach 1:
The system performs preliminary action by continuously or periodically adjusting the partial pressure control assembly during the deposition process rather than requiring separate pre-sputtering steps or maintenance interruptions. The movable shield can be positioned to control water vapor levels in advance, preventing process drift before it affects deposition quality, thereby maintaining high deposition quality without sacrificing productivity
Solution Approach 2:
The partial pressure control assembly enables continuous control of water vapor condensation throughout the deposition process. By continuously adjusting the fluid path between the processing area and cooling surface, the system maintains optimal partial pressure conditions without interruption, eliminating the need for periodic pre-sputtering or maintenance stops and thereby sustaining both high deposition quality and productivity
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 solution enhances the controllability of gas partial pressures, stabilizes water vapor levels, and improves deposition quality by maintaining a consistent environment, reducing process drift and optimizing film properties.
Implementation Method 1
a cooling surface for condensation of the gas
Data Source
AI summary
A vacuum processing apparatus (110) for deposition of a material on a substrate is provided. The vacuum processing apparatus (110) includes a vacuum chamber comprising a processing area (111); a deposition apparatus (112) within the processing area (111) of the vacuum chamber; a cooling surface (113) inside the vacuum chamber; and one or more movable shields (220) between the cooling surface (113) and the processing area (111).