Metal Coated Spike Array for Electron Emission
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Solution Overview
Problem
Existing technologies face challenges in achieving controlled electron emission with high precision and durability for applications like microscopy and displays, as they often require high voltages and suffer from tip degradation.
Innovation Solution
A spike array coated with a refractory metal layer is used, formed from a bundle of glass fibers with conically-shaped spikes, where the refractory metal layer is applied to induce electron emission, allowing for efficient electron emission at lower voltages and reducing degradation due to the array's design and materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electron emission technologies are used, then electron emission can be achieved, but high voltages are required and tip degradation occurs
Solution Approach 1:
The invention divides the electron emission function into multiple independent spikes arranged in an array. Each spike acts as an individual emission site, allowing the system to achieve high current emission without requiring excessively high voltages at each tip. The segmented structure also prevents degradation of the entire emission source when individual spikes wear, improving reliability
Solution Approach 2:
The invention uses composite structures combining support material (glass fibers) with functional material (refractory metal coating). The glass fiber provides mechanical support and structural integrity, while the refractory metal coating enables efficient electron emission. This composite approach allows operation at lower voltages while maintaining tip durability through the protective glass matrix
2Productivity
If high voltage is applied to achieve electron emission, then electron emission is achieved, but tip degradation accelerates
Solution Approach 1:
By distributing the electron emission function across many individual spikes in an array, the system achieves high total electron current without requiring high voltage at each spike. This segmentation reduces the stress and degradation rate at each individual tip, extending overall system longevity while maintaining productivity
Solution Approach 2:
The invention changes the geometric parameters of the emission tips by creating sharp conical spikes with small radii of curvature. This geometric parameter change enhances the local electric field at the tip surfaces, enabling efficient electron field emission at lower applied voltages, thereby improving both emission efficiency and tip durability
3Measurement precision
If conventional emission sources are used, then electron emission is achieved, but electron dispersion is high
Solution Approach 1:
The array of closely spaced spikes creates multiple coherent electron emission sites that produce a more focused and less dispersed electron beam compared to conventional single-point or thermionic sources. This segmented emission structure improves imaging resolution by reducing electron dispersion while the modular array design keeps the overall device structure manageable
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 metal-coated spike array enables efficient electron emission with reduced dispersion and increased durability, allowing for high-resolution imaging and display applications with improved longevity of the emission tips.
Implementation Method 1
one or more electrodes may be used to apply a voltage to the refractory metal layer to induce emission of electrons by one or more of the conically-shaped spikes
Data Source
AI summary
An article of manufacture includes a support structure including a cladding material and defining therein a plurality of substantially parallel cores. The article also includes a plurality of conically-shaped spikes protruding from a first side of the support structure. Each respective conically-shaped spike of the plurality of conically-shaped spikes includes a core material (i) extending through a corresponding core of the plurality of substantially parallel cores and (ii) comprising an axial protrusion that protrudes axially from the cladding material at the first side of the support structure. The axial protrusion of the core material is tapered to form the respective conically-shaped spike. The article also includes a refractory metal layer coating at least a portion of each respective conically-shaped spike and one or more electrodes connected to the refractory metal layer and configured to apply a voltage to the refractory metal layer.