Flat X-ray Emitter With Compliant Support for Thermal Expansion
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Solution Overview
Problem
Conventional X-ray tube emitters experience shorting due to thermal expansion and centrifugal forces during rotation, leading to degradation and inoperability.
Innovation Solution
A substantially flat emitter design with a first end supported by two rods from a two-rod insulator assembly and a second end supported by a compliant, single rod insulator assembly, allowing for thermal expansion and movement to prevent shorting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the emitter is rigidly supported at both ends, then structural stability is improved, but thermal expansion and centrifugal forces cause shorting and degradation
Solution Approach 1:
The emitter support system transitions from a static rigid structure to a dynamic compliant structure. The compliant mechanism at one end allows the emitter to move and expand dynamically in response to thermal and centrifugal loads, preventing shorting while maintaining overall structural stability.
Solution Approach 2:
The support system uses components with different mechanical properties - a rigid insulator assembly at one end and a compliant mechanism with elastic elements at the other end. This variation in mechanical parameters allows the system to accommodate thermal expansion and centrifugal forces while maintaining structural integrity.
2Reliability
If the emitter is made compliant to allow thermal expansion, then shorting is prevented, but structural stability may be compromised
Solution Approach 1:
The support system is segmented into two distinct functional zones: a rigid insulator assembly at one end providing structural stability, and a compliant mechanism with elastic elements at the other end providing thermal expansion accommodation. This segmentation allows each portion to optimize its specific function without compromising the other.
Solution Approach 2:
The support system combines materials and mechanisms with different mechanical properties - rigid insulating materials at one end and compliant elastic materials at the other end. This composite approach creates a hybrid structure that simultaneously provides structural stability and thermal compliance.
3Reliability
If additional support structures are added to prevent shorting, then emitter reliability is improved, but device complexity increases
Solution Approach 1:
The compliant mechanism integrates multiple functions into a single compact assembly. The elastic elements serve both as mechanical springs for thermal expansion accommodation and as structural connectors, eliminating the need for separate complex support structures while improving reliability.
Solution Approach 2:
The compliant mechanism uses elastic elements and flexible structural features that provide the necessary compliance for thermal expansion without requiring bulky additional components. This flexible approach maintains compactness while preventing shorting.
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 design enhances emitter efficiency and reduces degradation by preventing shorting, while maintaining focused electron emission and compactness.
Implementation Method 1
The compliant, single rod insulator assembly provides accommodation for thermal and mechanical expansion of the emitter without placing a large retraining force on the emitter that may cause deformation
Implementation Method 2
a second end of the emitter supported by a compliant, single rod insulator assembly
Implementation Method 3
The emitter may be heated by a current flowing through it to liberate electrons from the cathode and accelerate the electrons toward the anode
Implementation Method 4
ionizing radiation is created by accelerating electrons in a vacuum from a cathode to an anode via an electric field
Data Source
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AI summary
Various methods and systems are provided for an emitter assembly for a cathode (352) of an X-ray tube. In one example, an emitter assembly comprises a first end (426) of a substantially flat emitter (424) supported by two rods extending from a two-rod insulator assembly (420), and a second end (428) of the substantially flat emitter (424) supported by a compliant, single rod insulator assembly (414).