Arc Vapor Deposition Anode Structure for Droplet Separation
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Solution Overview
Problem
Existing film-forming devices face challenges in efficiently forming uniform films due to the attachment of by-product fine particles (droplets) onto the treated surface, which affects the smoothness and quality of the film, and the need for longer plasma flow paths reduces film-forming efficiency.
Innovation Solution
A film-forming device with a magnetic field generator arranged in a tubular shape and a protection member to guide plasma flow, which includes a water-cooling ring and surfaces to attach or reflect droplets, reducing their attachment to the treated surface and protecting the magnetic field generator from particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a curved magnetic field is used to bend plasma flow away from the anode, then the anode is protected from droplet attachment, but the plasma flow path length increases reducing film-forming efficiency
Solution Approach 1:
The magnetic field generator is divided into multiple independent coil sections (first coil section and second coil section) arranged at different positions. Each coil section can be independently controlled to generate magnetic fields with different strengths and directions, allowing optimization of plasma flow guidance while minimizing unnecessary path length extensions.
Solution Approach 2:
Different regions of the magnetic field generator have different magnetic field strengths tailored to local requirements. The first coil section creates a stronger magnetic field in its region to effectively bend plasma flow away from the anode, while the second coil section provides appropriate field strength for its position, ensuring efficient plasma guidance without excessive path lengthening throughout the entire system.
2Reliability
If the plasma flow path is extended to protect the anode, then droplet attachment to the anode is reduced, but the film-forming rate decreases
Solution Approach 1:
The magnetic field strength and distribution are dynamically optimized through the coordinated operation of multiple coil sections. The system creates an optimized magnetic field configuration that achieves effective droplet-plasma separation with minimal path length extension, thereby maintaining high film-forming rates while protecting the anode.
Solution Approach 2:
The magnetic field configuration is designed to replicate optimal field patterns in different spatial regions through the multiple coil sections. This allows the plasma flow to follow an optimized path that achieves separation objectives without unnecessary lengthening, maintaining efficiency while protecting the anode.
3Reliability
If a T-shaped branch structure is used to separate droplets from plasma flow, then droplet attachment to the substrate is reduced, but the device complexity increases
Solution Approach 1:
The patent replaces complex mechanical T-shaped branch structures with a magnetic field-based separation system. By using magnetic fields generated by coil sections to guide plasma flow and separate droplets, the system achieves effective droplet removal without the structural complexity of mechanical branching paths.
Solution Approach 2:
The system uses changes in magnetic field parameters (strength, direction, distribution) to achieve droplet separation instead of complex mechanical structures. By adjusting magnetic field parameters in different regions through the coil sections, the plasma flow is guided to follow paths that separate droplets from the substrate without requiring complex structural modifications.
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
The device effectively reduces the attachment of droplets to the treated surface, enhances film-forming efficiency by minimizing the plasma flow path length, and maintains the quality of the film by ensuring uniform deposition.
Implementation Method 1
a magnetic field generator constituted by the anode part or constituted integrally with or continuously from the anode part and generating a magnetic field by a self current of the arc discharge
Implementation Method 2
generating plasma by an arc discharge in vacuum between a cathode and an anode electrically connected to each other by way of a power source, and vaporizing a cathode material constituting the cathode
Implementation Method 3
which includes a water-cooling ring
Data Source
AI summary
A film-forming device forms a film by vapor deposition on an object's surface to be treated by vaporizing a cathode material constituting a cathode by a plasma generator which generates plasma by an arc discharge. The plasma generator includes a cathode part, an anode part arranged at an appropriate distance from the cathode part, a magnetic field generator and a protection member. The magnet field generator is constituted by the anode part or constituted integrally with or continuously from the anode part and generates a magnetic field by an electric current of the arc discharge. The protection member is constituted by part of the anode part, or constituted independently from the anode part while electrically connected to the anode part, and arranged outside a plasma flow region and protects part or a whole of the magnetic field generator from attachment of the cathode material.