X-ray tube
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United States of America Patent
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Dec 25, 2001
Grant Date -
N/A
app pub date -
Dec 30, 1999
filing date -
Mar 16, 1998
priority date (Note) -
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Abstract
An X-ray tube comprising an anode having a target surface radiating X-rays from a position of an X-ray focal spot by impingement of an electron beam, a focusing electrode and cathodes. The focusing electrode has a bottom portion positioned facing the target surface of the anode and most remote from the X-ray focal spot, at least one inclined wall surface obliquely ascending from the bottom portion in the direction of the anode, and substantially rectangular focusing recesses formed at the inclined wall surface. Each of the cathodes emits electron beams, positioned respectively in the focusing recesses of the focusing electrode. The focusing recess has first and second corners which curve from at least one end wall facing the end of the cathode to two side walls along the direction of the longer side of the cathode, and the first corner located remote from the bottom portion is gentler than the second corner located adjacent to the bottom portion with reference to condition of curving.
First Claim
Family
- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
- TOSHIBA ELECTRON TUBES & DEVICES CO., LTD.
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Kujirai, Masaji | Tochigi-ken, JP | 2 | 30 |
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Fee | Large entity fee | small entity fee | micro entity fee | due date |
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Fee | Large entity fee | small entity fee | micro entity fee |
---|---|---|---|
Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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