Field Emission Apparatus Gate Aperture Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Field emission apparatuses face challenges in controlling electron beam focusing and transmission due to potential distribution distortions caused by gate electrode apertures, leading to reduced electron emission and current magnitude.
Innovation Solution
Incorporating an electron transmissive sheet with fine openings on the gate electrode, made from materials like graphene or molybdenum disulfide, to alleviate potential distribution distortions and enhance electron beam focusing and transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the aperture size of the gate electrode is increased to improve electron transmission, then the current magnitude reaching the anode electrode increases, but the potential distribution distortion between the gate electrode and cathode electrode increases, reducing field effect on the emitter
Solution Approach 1:
The gate electrode aperture is segmented into multiple sub-apertures arranged in an array. This segmentation allows the gate electrode to maintain a larger overall aperture area for improved electron transmission while each individual sub-aperture maintains dimensions that minimize potential distribution distortion. The segmented structure effectively divides the aperture function between maximizing transmission area and minimizing field distortion.
Solution Approach 2:
The gate electrode structure transitions from a uniform aperture design to one where different regions have different characteristics. The sub-apertures are strategically positioned and sized to create localized field conditions that optimize both electron transmission in high-current regions and field uniformity in regions critical for emitter control. This local quality variation resolves the contradiction between overall transmission and local field distortion.
2Quantity of substance
If the aperture of the gate electrode is increased to improve electron transmission, then more electrons reach the anode electrode, but the electron beam trajectory path becomes distorted, reducing emission efficiency and current magnitude
Solution Approach 1:
The single large aperture is segmented into multiple smaller sub-apertures that collectively provide sufficient transmission area. Each sub-aperture produces a localized, well-defined electron beam trajectory with minimal distortion. The combined effect of multiple segmented apertures achieves high electron transmission while maintaining precise beam focusing and trajectory control that would be impossible with a single large aperture.
Solution Approach 2:
The sub-apertures are arranged in a nested or organized pattern within the gate electrode structure, with each sub-aperture positioned to optimize its contribution to the overall electron beam. This nested arrangement allows the system to achieve both high transmission (through the collective area of all sub-apertures) and high precision (through the controlled geometry of each individual sub-aperture).
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 electron transmissive sheet with fine openings improves electron beam focusing and transmission efficiency, reducing distortion and increasing production yield while maintaining high electron permeability.
Implementation Method 1
an electron transmissive sheet on the gate electrode and including a plurality of fine openings overlapping the gate aperture
Implementation Method 2
A field emission apparatus is applicable a variety of devices such as field emission displays, engineering X-ray tubes, and medical X-ray tubes
Implementation Method 3
an emitter on the cathode electrode
Data Source
AI summary
Disclosed is a field emission apparatus. The apparatus comprises a cathode electrode and an anode electrode spaced apart from each other, an emitter on the cathode electrode, a gate electrode between the cathode and anode electrodes and including at least one gate aperture overlapping the emitter, and an electron transmissive sheet on the gate electrode and including a plurality of fine openings overlapping the gate aperture.