Field Emission X-Ray Source Housing for Charge Dissipation
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Solution Overview
Problem
Existing field emission-type X-ray sources face challenges in dissipating residual charges due to housings made of insulating materials, leading to emitter deterioration from arc discharges.
Innovation Solution
The X-ray source design incorporates a first housing made of ceramic and a second housing made of metal, with the second housing being grounded to facilitate charge dissipation, and includes a window on the flange for ease of connection and alignment with other devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the housing is made of insulating material such as ceramic, then the housing provides electrical insulation, but residual charge cannot be removed and emitter deterioration occurs due to arc discharges
Solution Approach 1:
The housing is divided into two separate housing parts: a first housing part made of insulating material (ceramic) that provides electrical insulation, and a second housing part made of conductive material (metal) that provides a path for charge dissipation. This segmentation allows each part to fulfill its specific function without compromise.
Solution Approach 2:
Different parts of the housing have different material properties: the first housing part (surrounding the anode) uses insulating material where electrical insulation is critical, while the second housing part (surrounding the cathode) uses conductive material where charge dissipation is critical. Each local region has the material quality needed for its specific functional requirement.
2Reliability
If the housing is made of insulating material, then charge retention is prevented through insulation, but residual charges accumulate and cannot be dissipated
Solution Approach 1:
The housing is segmented into two parts with different electrical properties: the first housing part provides charge isolation through insulating material, while the second housing part provides charge dissipation through conductive material connected to ground. This segmentation resolves the contradiction between charge isolation and charge dissipation.
Solution Approach 2:
The second housing part acts as an intermediary between the vacuum chamber and ground, providing a conductive path that mediates the dissipation of residual charges while the first housing part maintains charge isolation. The intermediary structure enables both charge isolation and dissipation functions.
3Device complexity
If a single housing structure is used, then the device structure is simple, but it cannot simultaneously provide both insulation and charge dissipation functions
Solution Approach 1:
The housing is segmented into two functional parts that can be manufactured separately and assembled together. This segmentation enables the structure to provide both insulation and charge dissipation functions while maintaining reasonable manufacturing simplicity and assembly ease.
Solution Approach 2:
The housing uses a composite structure combining two different materials: insulating ceramic material for the first housing part and conductive metal material for the second housing part. This composite approach enables dual functionality (insulation and charge dissipation) within a single integrated housing assembly.
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 prevents emitter deterioration by minimizing charge retention and allows for efficient charge dissipation, while providing convenience in device integration.
Implementation Method 1
causing electrons to be emitted from the emitter by the gate voltage applied to the gate electrode
Implementation Method 2
causing the emitted electrons to be accelerated toward the anode electrode due to a voltage difference between the cathode voltage and anode voltage
Implementation Method 3
collided with the target... to generate X-rays
Implementation Method 4
easily introducing residual charges in the housing into the second housing made of metal material that are dissipated
Data Source
AI summary
The present invention provides an X-ray source comprising: an anode electrode on which a target is formed; a tubular-shaped first housing which is made of an insulating material and at one end of which the anode electrode is provided; a tubular-shaped second housing which is made of a conductive material and one end of which is connected to the first housing; and a cathode electrode which is provided at the other end of the second housing and has an emitter formed opposite to the target.