Electron beam generator, electron beam emission device and X-ray emission device
US-12230413-B2 · Feb 18, 2025 · US
Cathode selection method
US8968045B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8968045-B2 |
| Application number | US-201314064520-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 28, 2013 |
| Priority date | Oct 30, 2012 |
| Publication date | Mar 3, 2015 |
| Grant date | Mar 3, 2015 |
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Abstract
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A cathode selection method includes measuring, by using a cathode having an electron emission surface which is a flat surface and a emission area which is limited, a total emission emitted from the cathode; calculating, using a measured total emission value, work function by a Richardson Dash Man's formula; and determining whether or not the cathode has the work function equal to or under an acceptable value.
First claim
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What is claimed is: 1. A cathode selection method comprising: measuring, with an ammeter, a total emission emitted from a cathode having an electron emission surface which is a flat surface and a emission area which is limited; measuring, with a temperature measurement device, a temperature of the electron emission surface of the cathode when electrons are emitted from the cathode; calculating a work function by a Richardson Dash Man's formula based on the total emission value…
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- H01J1/13Primary
Electricity · mapped topic
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- What does patent US8968045B2 cover?
- A cathode selection method includes measuring, by using a cathode having an electron emission surface which is a flat surface and a emission area which is limited, a total emission emitted from the cathode; calculating, using a measured total emission value, work function by a Richardson Dash Man's formula; and determining whether or not the cathode has the work function equal to or under an ac…
- Who is the assignee on this patent?
- Nuflare Technology Inc
- What technology area does this patent fall under?
- Primary CPC classification H01J1/13. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Mar 03 2015 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).