Dual Thermionic Electron Gun for Coating Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electron guns suffer from reduced service and active life due to cathode deformation and erosion caused by constant electron bombardment, leading to altered evaporation rates and decreased productivity in material coating processes.
Innovation Solution
The axial electron gun design incorporates two thermionic electron sources, where a primary source heats and emits electrons to bombard a secondary source, creating a stable electron beam that accelerates and deflects through magnetic fields, with adjustable components for compact mounting and efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single thermionic electron source is used, then the electron gun structure is simple, but the cathode deforms and erodes due to constant electron bombardment, significantly reducing service life
Solution Approach 1:
The electron source is divided into two separate thermionic electron sources (first and second sources) instead of using a single source. This segmentation allows the electron beam to be generated through a process where one source heats and emits electrons that bombard the second source, creating a stable electron beam while preventing cathode deformation and erosion, thereby significantly increasing service life.
2Productivity
If the electron gun is designed for high power rating, then it can process more targets, but the physical size of the head, accelerating electrode, and platform increases
Solution Approach 1:
The patent introduces adjustable mounting structures including adjustable arms, adjustable brackets, and height-adjustable platforms that allow dynamic reconfiguration of the electron gun components. This enables the system to maintain high power rating and processing capacity while optimizing the physical footprint, as components can be positioned and adjusted to fit different spatial requirements without sacrificing performance.
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 design significantly increases the active and average life of the electron gun by stabilizing evaporation rates and allowing for efficient replacement, doubling the number of targets that can be coated, while maintaining compact size and cost-effectiveness.
Implementation Method 1
a primary thermionic electron source, a secondary thermionic electron source... heating a primary thermionic electron source; emitting a first electron beam from the primary thermionic electron source
Implementation Method 2
accelerate the second electron beam through a second electric field... accelerating electrode is typically less negatively charged than the electron source and the focusing electrode to cause the electrons to form into a beam
Implementation Method 3
The focusing electrode is typically negatively charged to repel the electrons and thereby direct the electrons in a direction generally toward the accelerating electrode... focusing the second electron beam through a focusing electrode
Implementation Method 4
one or more deflection coils disposed within a third housing... deflecting the second electron beam through one or more magnetic fields... one or more focusing coils disposed within a second housing... focusing the second electron beam through one or more magnetic fields
Data Source
AI summary
An electron gun includes the following: a primary thermionic electron source, a secondary thermionic electron source and a focusing electrode disposed within a first housing that includes one or more reference members adjustably attached to a housing support connected to a first platform; an anode and one or more focusing coils disposed within a second housing comprising one or more insulating members adjustably connected to the first platform; and one or more deflection coils disposed within a third housing connected to the second housing and located opposite said first housing.