Plasma Processing Device High-Frequency Generator Signal Injection
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Solution Overview
Problem
Existing plasma processing devices face challenges in maintaining stable plasma generation due to fluctuations in magnetron manufacturing, leading to variations in oscillation frequency and unwanted spurious frequency components, which affect effective power and impedance stability.
Innovation Solution
A plasma processing device configuration that includes a high-frequency generator with a signal injection unit to reduce different frequency components in the high-frequency waves, ensuring a stable fundamental frequency and clean waveform, thereby stabilizing plasma generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a magnetron is used as a high-frequency wave generation source, then high power output is achieved, but oscillation frequency fluctuates due to manufacturing variations
Solution Approach 1:
The patent employs a feedback mechanism where the oscillation frequency of the magnetron is detected and compared with a reference frequency, and the detected frequency is fed back to adjust the magnetron's operation. This feedback loop compensates for frequency deviations caused by manufacturing variations, thereby maintaining stable oscillation frequency while preserving high power output capability
Solution Approach 2:
The patent changes operational parameters of the magnetron based on detected frequency deviations. By adjusting parameters such as voltage or current supplied to the magnetron according to the detected frequency, the system maintains stable oscillation frequency while keeping the magnetron operating at high power levels
2Ease of manufacture
If mechanically machined products are used to manufacture magnetron components, then manufacturing cost is reduced, but oscillation frequency varies among individual units
Solution Approach 1:
The patent enables each magnetron to self-adjust its oscillation frequency through the detection and feedback mechanism. Each magnetron unit independently detects its own frequency deviation and makes necessary adjustments, eliminating the need for precise manual calibration during manufacturing. This allows mechanically machined components to be used while maintaining frequency consistency across production batches
Solution Approach 2:
The patent performs frequency detection and adjustment as a preliminary action before the magnetron is put into actual plasma processing operation. By pre-adjusting the frequency using the detection mechanism, the system compensates for manufacturing variations in mechanically machined components, ensuring frequency consistency without requiring higher manufacturing precision
3Reliability
If the oscillation frequency is fixed to a reference signal frequency, then impedance matching is improved, but spurious frequency components cannot be effectively reduced
Solution Approach 1:
The patent introduces an intermediary frequency detection and adjustment mechanism between the magnetron and the reference signal. Instead of directly fixing the magnetron frequency to the reference signal, the detection mechanism acts as an intermediary that continuously monitors and adjusts the frequency, thereby maintaining impedance matching while also enabling suppression of spurious frequency components through active control
4Productivity
If different frequency components are present in the high-frequency waves, then plasma generation occurs, but effective power and impedance stability deteriorate
Solution Approach 1:
The patent uses a feedback mechanism where the frequency composition of the high-frequency waves is detected and fed back to the magnetron control system. Based on this feedback, the system adjusts the magnetron operation to maintain the fundamental frequency while suppressing different frequency components, thereby maintaining both plasma generation and effective power stability
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 configuration allows for long-term stable plasma generation and extended lifespan by minimizing the impact of frequency fluctuations and spurious components on effective power and impedance.
Implementation Method 1
a high-frequency oscillator configured to oscillate high-frequency waves
Implementation Method 2
an injection unit configured to inject a signal into the high-frequency oscillator, the signal having a frequency which is the same as a fundamental frequency oscillated by the high-frequency oscillator and having reduced different frequency components
Implementation Method 3
a plasma generation mechanism configured to generate the plasma in the processing container using the high-frequency waves generated by the high-frequency generator
Data Source
AI summary
Provided is a plasma processing device which processes an object to be processed using plasma. The plasma processing device includes: a processing container configured to perform a processing by the plasma therein; and a plasma generation mechanism including a high-frequency generator disposed outside the processing container to generate high-frequency waves. The plasma generation mechanism is configured to generate the plasma in the processing container using the high-frequency waves generated by the high-frequency generator. The high-frequency generator includes a high-frequency oscillator configured to oscillate the high-frequency waves and an injection unit configured to inject a signal into the high-frequency oscillator. The signal has a frequency which is the same as a fundamental frequency oscillated by the high-frequency oscillator and has reduced different frequency components.