Movable Evaporation Source for Uniform Cathodic Arc Deposition

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Solution Overview

Problem

Current cathodic arc physical vapor deposition systems suffer from non-uniform deposition due to a fixed cathode location, leading to inconsistent coating thickness on workpieces.

Innovation Solution

A moveable evaporation source system is introduced, featuring a cathode support member with a telescoping mechanism and insulator for electrical isolation, allowing the cathode to be translated along the Y-axis, enabling uniform deposition by varying the down force and maintaining electrical isolation to control the arc path.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a fixed cathode location is used in cathodic arc physical vapor deposition, then the system structure is simple, but the deposition uniformity deteriorates

Engineering Contradiction:

Improvesystem structureVSAvoiddeposition uniformity

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The cathode is transformed from a fixed position to a movable one through the introduction of a drive mechanism. The cathode support member can translate the cathode along the deposition chamber, enabling dynamic adjustment of the evaporation source position to achieve uniform material deposition across the workpiece surface.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

A force provider mechanism is introduced to counterbalance the cathode's weight and control its position. This allows precise positioning and movement of the cathode without requiring complex support structures, resolving the contradiction between structural simplicity and positioning precision.

Inventive Principle:

Principle #8Anti-weight (Counterweight)

2Manufacturing precision

If a movable cathode is introduced to improve deposition uniformity, then the deposition uniformity improves, but the device complexity increases

Engineering Contradiction:

Improvedeposition uniformityVSAvoidsystem structure

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The cathode assembly is segmented into distinct functional components: the cathode itself, the cathode support member for positioning, the force provider for movement control, and the insulator for electrical isolation. This segmentation allows each component to be optimized independently while maintaining overall system simplicity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The cathode support member acts as an intermediary between the fixed deposition chamber and the movable cathode. It provides the necessary mechanical support, positioning, and movement functions while isolating the complexity of the drive mechanism from the chamber structure.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Area of stationary object

If the cathode is moved to different positions, then the deposition coverage improves, but maintaining electrical isolation becomes more difficult

Engineering Contradiction:

Improvedeposition coverageVSAvoidelectrical isolation

Core Design Contradiction:

Area of stationary objectVSReliability

Solution Approach 1:

The insulator serves as an electrical intermediary between the movable cathode and the grounded cathode support member. It maintains reliable electrical isolation throughout the cathode's range of motion, preventing unwanted arcing and ensuring stable arc discharge regardless of cathode position.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 solution ensures more uniform material deposition on workpieces by allowing precise control over cathode positioning, improving coating uniformity without requiring extensive modifications to the deposition chamber.

Implementation Method 1

a cathode support member disposed beneath the insulator and exerting an upward force on the insulator and cathode

Methodology Applied

Scientific EffectMechanical Force: Force

Implementation Method 2

providing a down force from a down force source on a cathode whereby the cathode is located at a first position

Methodology Applied

Scientific EffectMechanical Force: Force

Implementation Method 3

initiating an arc whereby material is liberated from the cathode

Methodology Applied

Scientific EffectCathodic Arc Deposition: Cathodic Arc Deposition

Implementation Method 4

an arc of electricity to extend therebetween

Methodology Applied

Scientific EffectElectric Arc: Electric Arc

Implementation Method 5

an insulator disposed above a cathode support member

Methodology Applied

Scientific EffectElectrical Insulation: Dielectric

Implementation Method 6

depositing the liberated material on a first deposition site on a workpiece wherein the liberated material follows a look angle and strikes the workpiece

Methodology Applied

Scientific EffectPhysical Vapor Deposition: Physical Vapour Deposition

Data Source

PatentUS9970098B2Movable evaporation source

Publication Date: 2018.05.15 RTX CORP

AI summary

A moveable evaporation source system may have an insulator disposed above a cathode support member, and a cathode support member disposed beneath the insulator and exerting an upward force on the insulator so that the upward force exerted by the cathode support member urges the insulator toward a down force source. A cathode may be placed between the insulator and the down force source and translated so that material liberated from the cathode may strike different portions of a workpiece as the cathode is translated.