Group Control System for Reactive Coating Processes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Reactive sputtering processes require complex control techniques due to sensitive stoichiometry and unstable reaction dynamics, leading to difficulties in maintaining the desired setpoint, especially in high-productivity coating systems with multiple processes, where gas separation is necessary but space-demanding, causing interactions between coating processes that can destabilize the system.
Innovation Solution
A group control system is implemented to reduce the complexity of multiple coating processes by relating the manipulated variables of each process to each other, allowing for closed-loop control with a correction element that adjusts their control values to compensate for differences, thereby stabilizing the system and maintaining the desired setpoint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pump chambers are disposed between two coating processes to provide strong gas sink and inhibit gas exchange, then gas separation is improved, but space demand increases
Solution Approach 1:
The patent extracts the gas separation function from the physical separation structure (pump chambers) and implements it through a control-based approach. By using control circuits to monitor and adjust gas flow rates, the system achieves gas separation without requiring additional physical space for pump chambers between coating processes.
Solution Approach 2:
The patent replaces the mechanical/physical gas separation system (pump chambers) with a control system that uses sensors and control circuits to regulate gas flow. This substitution eliminates the need for physical separation structures while maintaining gas separation effectiveness.
2Area of stationary object
If multiple coating processes are operated in high-productivity mode with reduced gas separation, then space requirements are reduced, but control complexity increases due to interactions between processes
Solution Approach 1:
The patent merges the control of multiple coating processes into a unified control system. By using a central control circuit that receives signals from sensors across all processes and coordinates gas flow rates accordingly, the system manages interactions between processes without requiring separate control mechanisms for each process.
Solution Approach 2:
The control circuit is designed with multi-functionality, serving multiple coating processes simultaneously. It can monitor and adjust gas flow rates for different processes, handle interactions between processes, and maintain optimal operating conditions across all processes through a single integrated 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
This approach enables stable operation of multiple reactive coating processes with reduced space requirements by compensating for differences between processes, maintaining the desired setpoint and preventing destabilization, thus improving the control and productivity of the coating system.
Implementation Method 1
The coating process may be effected, for example, by means of a physical vapor deposition, for example cathodic atomization (also known as sputtering).
Implementation Method 2
at least one reactive gas with which the atomized target material chemically reacts (also referred to as coating material) is added, such that the reaction product is deposited on the substrate.
Implementation Method 3
closed-loop control of the process group by means of a first manipulated variable from the first coating process and a second manipulated variable from the second coating process and using a correction element
Data Source
AI summary
In various aspects of the disclosure, a method of operating a process group that performs at least a first reactive coating process and a second reactive coating process may comprise: coating of a substrate by means of the first reactive coating process and by means of the second reactive coating process; closed-loop control of the process group by means of a first manipulated variable of the first coating process and a second manipulated variable of the second coating process and using a correction element; wherein the correction element relates the first manipulated variable and the second manipulated variable to one another in such a way that their control values are different from one another.