Electron source and method for manufacturing same, and emitter and device provided with same
US-2023317395-A1 · Oct 5, 2023 · US
Thermionic cathode with even electric field distribution on electron emitting surface
US9299525B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9299525-B2 |
| Application number | US-201314047827-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 7, 2013 |
| Priority date | Nov 19, 2012 |
| Publication date | Mar 29, 2016 |
| Grant date | Mar 29, 2016 |
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Abstract
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A thermionic cathode of an embodiment includes a carbon coating applied to an outer surface of the side, the carbon coating comprising a contiguous extended portion surrounding the upper section and spaced apart from said upper section by a gap having 1 μm or more and 10 μm or less in width and having a difference of 1 μm or less in the width between a maximum value and a minimum value in a periphery of the electron emitting surface.
First claim
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What is claimed is: 1. A thermionic cathode, comprising: a main body having an upper section and sides, the upper section having an electron emitting surface; and a carbon coating applied to an outer surface of the sides, the carbon coating comprising a contiguous extended portion surrounding the upper section and spaced apart from said upper section by a gap formed by using a sacrificial film, the gap being made to be 1 μm or more and 10 μm or less in width and to have a difference of 1 μm or less in width between a maximum value and a minimum value in a periphery of the electron emitting surface. 2. The thermionic cathode according to claim 1 , wherein the main body is formed of a material selected from the group consisting of crystals of lanthanum hexaboride (LaB 6 ), cerium hexaboride (CeB 6 ), and hafnium carbide (HfC), and sintered compacts of lanthanum hexaboride (LaB 6 ), cerium hexaboride (CeB 6 ), hafnium carbide (HfC), tungsten-barium-aluminum-oxygen (W—Ba—Al—O), and barium-scandium-tungsten-aluminum (Ba—Sc—W—O). 3. The cathode according to claim 1 , wherein the upper section of the main body has a truncated conical shape.
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Classifications
Thermionic sources · CPC title
- H01J1/148Primary
with compounds having metallic conductive properties, e.g. lanthanum boride, as an emissive material · CPC title
using electron beams · CPC title
Electron or ion microscopes · CPC title
Construction of guns or parts thereof (H01J37/067 - H01J37/077 take precedence) · CPC title
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- What does patent US9299525B2 cover?
- A thermionic cathode of an embodiment includes a carbon coating applied to an outer surface of the side, the carbon coating comprising a contiguous extended portion surrounding the upper section and spaced apart from said upper section by a gap having 1 μm or more and 10 μm or less in width and having a difference of 1 μm or less in the width between a maximum value and a minimum value in a per…
- Who is the assignee on this patent?
- Nuflare Technology Inc
- What technology area does this patent fall under?
- Primary CPC classification H01J1/148. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Mar 29 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).