Electron Emission Element Intermediate Layer Flatness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing methods for forming insulating layers in electron emission elements, such as using anodized films or insulating sheets, face challenges like irregular surface properties, leakage resistance issues, and increased costs due to complex manufacturing processes, which lead to reduced electron emission stability and lifespan.
Innovation Solution
An electron emission element with an intermediate layer and an insulating layer formed on a substrate, where the level difference between the insulating layer and the electrode is minimized, and the intermediate layer's thickness is optimized between 0.3 μm and 5 μm, using a conductive substrate and anodized film to enhance mechanical strength and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulating layer is formed using conventional methods (anodized film peeling or insulating sheet attachment), then insulation is achieved, but surface irregularity and level differences cause thin regions in the semiconductive layer leading to electrode breakage and reduced reliability
Solution Approach 1:
The patent introduces an intermediate layer between the insulating layer and the semiconductive layer to act as a mediator. This intermediate layer fills the gaps and irregularities caused by the insulating layer's surface profile, providing a flat foundation for the semiconductive layer and preventing thin regions that would lead to electrode breakage.
Solution Approach 2:
The patent addresses the surface irregularity problem by adding a third dimensional element - the intermediate layer with specific thickness control. By controlling the intermediate layer thickness to be greater than the insulating layer's surface protrusion height, the patent transforms the problematic surface profile into a flat effective emission surface.
2Manufacturing precision
If the insulating layer thickness is increased to cover level differences, then surface coverage is improved, but the overall element thickness increases and manufacturing complexity increases
Solution Approach 1:
The patent divides the insulation and emission functions into separate layers: an insulating layer for electrical isolation and an intermediate layer for surface flattening. This segmentation allows each layer to be optimized independently - the insulating layer can be thin for cost-effectiveness while the intermediate layer provides the necessary surface coverage.
3Reliability
If conventional insulating methods are used, then insulation is provided, but mechanical strength is insufficient leading to leakage current and reduced lifespan
Solution Approach 1:
The patent employs a composite structure combining an insulating layer (alumite film) with an intermediate layer. This composite structure leverages the excellent insulating properties of the alumite film while the intermediate layer provides enhanced mechanical strength and surface flatness, preventing leakage current paths.
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 reduces electrode breakage, maintains electron emission efficiency, and extends the lifespan of the electron emission element by stabilizing the power feeding path and ensuring uniform electron emission.
Implementation Method 1
using a conductive substrate and anodized film to enhance mechanical strength and stability
Data Source
AI summary
An electron emission element (20) includes a first electrode (30a) and a second electrode (40) which are arranged facing each other, an intermediate layer (50) that is provided between the first electrode (30a) and the second electrode (40), and an insulating layer (60) that is formed with a thickness d1 on a substrate (30). A level difference between the insulating layer (60) and the first electrode (30a) is smaller than the thickness d1 of the insulating layer (60).