Plasma CVD Electrode Array for 3D Substrate Coating
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Solution Overview
Problem
Current plasma CVD systems are inefficient for treating 3D substrates due to long batch times and uneven layer thicknesses, particularly when using magnetron electrodes, which are not suitable for 3D parts and result in undesirable thickness fluctuations.
Innovation Solution
The apparatus employs a plasma CVD discharge device with multiple plate-shaped electrodes oriented along a pylon, allowing for increased plasma generation area and power input, reducing voltage requirements, and optimizing electrode placement for higher coating rates and quality, including the use of alternating or pulsed voltages for improved homogeneity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If magnetron electrodes are used for plasma treatment, then plasma generation is achieved, but the coating uniformity deteriorates due to strong fluctuations in layer thicknesses on 3D substrates
Solution Approach 1:
The plasma CVD discharge device is divided into multiple independent plate-shaped electrodes (at least three) arranged around the pylon, each capable of generating plasma independently. This segmentation allows the plasma generation to be distributed around the substrate holder, ensuring more uniform plasma exposure and coating thickness on 3D substrates compared to a single magnetron electrode.
Solution Approach 2:
The invention transitions from using magnetron electrodes that require close proximity to the substrate surface to plate-shaped electrodes arranged in multiple dimensions around the pylon. This spatial arrangement in multiple dimensions allows plasma generation at various positions around 3D substrates without requiring close distance, thereby achieving uniform coating on complex geometries.
2Manufacturing precision
If batch-type installations with planetary substrate holders are used, then substrate coating is achieved, but the batch time increases to greater than 10 minutes due to great space requirements
Solution Approach 1:
The invention combines multiple plate-shaped electrodes and their plasma generation capabilities into a single integrated plasma CVD discharge device assigned to the pylon. This merging of multiple plasma sources into one coordinated system allows simultaneous treatment of substrates at different positions, reducing batch time while maintaining coating quality.
Solution Approach 2:
The multiple plate-shaped electrodes can be operated simultaneously or in sequence to provide continuous plasma generation around the rotating pylon. This continuous plasma action ensures that substrates receive consistent treatment throughout their rotation, maintaining coating quality while reducing the overall batch time compared to sequential processing.
3Power
If more plate-shaped electrodes are used in the plasma CVD discharge device, then the plasma generation area and power input increase, but the device complexity increases
Solution Approach 1:
Each plate-shaped electrode serves multiple functions: generating plasma, providing a large excitation area, and contributing to uniform plasma distribution around the pylon. This multi-functionality of each electrode component allows the system to achieve high plasma power input without proportionally increasing overall device complexity, as each element performs several critical roles.
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 significantly increases the plasma CVD coating rate while maintaining coating quality, reducing batch time and addressing the issue of uneven layer thicknesses, making it suitable for 3D substrates with improved productivity and efficiency.
Implementation Method 1
a power supply device for the excitation of a plasma discharge, by means of at least one electrical voltage applied to at least two of the electrodes is provided, the excited plasma acting at least on parts of the pylon and on substrates that can be arranged on them
Implementation Method 2
plasma CVD discharge device assigned to the pylon suitable and adapted for vacuum treatment of 3D substrates
Data Source
AI summary
An apparatus for the vacuum treatment of substrates in a vacuum chamber includes a substrate support device with a pylon which can be rotated about a longitudinal axis and has holding means for substrates and a plasma discharge device assigned to the pylon. The plasma discharge device includes more than two plate-shaped electrodes having excitation areas, the excitation areas of which are all oriented in the direction of the pylon and a power supply device for the excitation of a plasma discharge, by at least one electrical voltage applied to at least two of the electrodes, is provided, the excited plasma acting at least on parts of the pylon and on substrates that can be arranged on them. A process performs the vacuum coating by the apparatus.