Emitter Support Structure Brazing Leakage Prevention
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Solution Overview
Problem
Conventional field emission devices face issues with redundant brazing material leaking and expanding, causing joint defects with the guard electrode, leading to loss of function and gas retention due to insufficient clearance between contact surfaces during the vacuum brazing process.
Innovation Solution
The emitter support structure features a protruding portion with slits in the circumference wall and a redundant brazing material groove, allowing the leaked material to be redirected away from the guard electrode and facilitating gas release, ensuring proper function and alignment of the emitter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If vacuum brazing is performed to join components, then strong joints are formed, but redundant brazing material leaks and expands to reach the guard electrode, causing joint defects and loss of device function
Solution Approach 1:
The protruding portion is designed to extract and contain the redundant brazing material within its circumferential space, preventing it from reaching the guard electrode. The protruding portion acts as a containment structure that separates the brazing material from critical components during the vacuum brazing process.
Solution Approach 2:
The protruding portion serves as an intermediary structure between the joint area and the guard electrode. It provides a buffer zone that intercepts and contains the expanding brazing material, preventing direct contact with the guard electrode and eliminating the harmful effect of material leakage.
2Manufacturing precision
If the clearance between contact surfaces is reduced to improve precision, then alignment is improved, but gas such as air is not completely drained, causing junction defects
Solution Approach 1:
The protruding portion is designed with specific local characteristics - a circumferential space that provides gas drainage capability while maintaining precise alignment. This local structural feature allows gas to escape from the contact interface without compromising the overall precision of the joint.
3Stability of the object's composition
If the emitter support structure is made rigid to maintain position, then stability is improved, but the emitter cannot be shifted between discharge and non-discharge positions, losing device function
Solution Approach 1:
The emitter support structure incorporates movable characteristics that allow the emitter to be shifted between discharge and non-discharge positions. The structure maintains stability during operation while enabling positional adjustment for different functional states, combining rigidity with controlled mobility.
Data Source
AI summary
An emitter support structure for a field emission device, the emitter support structure includes: a support portion disposed to be moved in a direction of both ends of a vacuum chamber of the field emission device, and configured to support an emitter of the field emission device; a protruding portion formed at one end portion of the support portion which confronts a target of the field emission device, and to which the emitter is inserted and mounted; a slit formed in a circumference wall portion of the protruding portion in a height direction of the circumference wall portion; and a redundant brazing material groove formed in an outside of the protruding portion along the circumference wall portion.