Cathodic Arc Ignition Finger Retraction to Minimize Coating Buildup
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Solution Overview
Problem
Conventional arc ignition devices for cathodic arc deposition suffer from frequent maintenance needs due to coating film buildup, leading to reduced efficiency and prolonged black-out periods during electric arc re-ignition, which affects the speed and reliability of the coating manufacturing process.
Innovation Solution
An arc ignition device with a trigger finger that moves rapidly between contacting and resting positions, utilizing an electromagnetic actuator for fast and precise movement, and a confinement member to minimize contamination, allowing for re-ignition of the electric arc within 20-50 ms, thus eliminating black-out periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional ignition finger is used for arc ignition, then the arc can be ignited at the target surface, but coating film builds up on the ignition finger requiring frequent maintenance
Solution Approach 1:
The harmful effect of coating buildup on the ignition finger is eliminated by extracting the ignition finger from the coating deposition zone. The ignition finger is positioned outside the chamber or in a protected position where it does not expose to the plasma and evaporated material, thus preventing coating accumulation while maintaining its ignition function.
Solution Approach 2:
An intermediary mechanism (such as a movable holder or positioning system) is introduced to control the ignition finger's position. This intermediary allows the ignition finger to contact the target for ignition while preventing it from being exposed to coating material, effectively mediating between the ignition requirement and the contamination prevention requirement.
2Reliability
If maintenance is performed frequently on the ignition finger, then coating buildup is removed, but operative time is reduced and efficiency decreases
Solution Approach 1:
By extracting the ignition finger from the coating deposition environment, the source of contamination is removed. This eliminates the need for frequent maintenance interruptions, allowing continuous operation and maintaining high productivity while ensuring the ignition finger remains functional.
Solution Approach 2:
The ignition finger is preliminarily positioned in a protected location before the coating process begins. This preliminary positioning prevents contamination from occurring in the first place, eliminating the need for subsequent maintenance actions and preserving productivity.
3Duration of action of stationary object
If the ignition finger remains in contact with the target during arc deposition, then continuous ignition is possible, but contamination and coating buildup increase
Solution Approach 1:
The ignition finger's position is made dynamic rather than static. It can move between a contacting position (for ignition) and a retracted/protected position (during deposition). This dynamic positioning allows the system to achieve both continuous arc capability and contamination prevention by adjusting the finger's position as needed.
Solution Approach 2:
The ignition finger contacts the target periodically or on-demand rather than continuously. It is positioned to contact the target only when ignition is required, then retracted to avoid contamination. This periodic action pattern maintains arc continuity when needed while minimizing exposure to harmful coating material.
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 solution significantly reduces maintenance requirements and ensures fast, reliable, and high-quality cathodic arc deposition by minimizing contamination and enabling quick re-ignition of the electric arc, enhancing the overall efficiency of the coating manufacturing process.
Implementation Method 1
utilizing an electromagnetic actuator for fast and precise movement
Implementation Method 2
ignite an electric arc at the surface of the target material
Implementation Method 3
cathodic arc deposition is a known physical vapor deposition process
Data Source
Figure 1
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Figure 2b
AI summary
An arc ignition device for cathodic arc deposition of a target material onto a substrate, comprising a trigger finger arranged moveable between a contacting position and a resting position, wherein in the contacting position a side surface of an adjacent target can be physically contacted by the trigger finger, and in the resting position the adjacent target cannot be contacted by the trigger finger, wherein during cathodic arc deposition of a target material, the trigger finger is arranged movable between the contacting position and the resting position in such a way that the contamination of the trigger finger with deposited target material during the cathodic arc deposition of the target material can be minimized.