JP2003092076A5 - - Google Patents
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- Publication number
- JP2003092076A5 JP2003092076A5 JP2001284581A JP2001284581A JP2003092076A5 JP 2003092076 A5 JP2003092076 A5 JP 2003092076A5 JP 2001284581 A JP2001284581 A JP 2001284581A JP 2001284581 A JP2001284581 A JP 2001284581A JP 2003092076 A5 JP2003092076 A5 JP 2003092076A5
- Authority
- JP
- Japan
- Prior art keywords
- cracking
- particle size
- lanthanum hexaboride
- filling
- powder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Description
【0014】
次に、六ホウ化ランタンの粉末の粒径について説明する。溝に充填する六ホウ化ランタンの粒径は、ひび割れ特性に影響を与える。例えば、粒径を1μm近辺に揃えると,ひび割れが生じやすい。これに対して、さまざまな粒径を混ぜておくと(例えば、20μm〜数μmの範囲内で)、ひび割れが生じにくい。
次に、六ホウ化ランタンの粉末の粒径について説明する。溝に充填する六ホウ化ランタンの粒径は、ひび割れ特性に影響を与える。例えば、粒径を1μm近辺に揃えると,ひび割れが生じやすい。これに対して、さまざまな粒径を混ぜておくと(例えば、20μm〜数μmの範囲内で)、ひび割れが生じにくい。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001284581A JP3699666B2 (ja) | 2001-09-19 | 2001-09-19 | X線管の熱陰極 |
US10/245,660 US6738453B2 (en) | 2001-09-19 | 2002-09-17 | Hot cathode of X-ray tube |
EP02020891A EP1296350B1 (en) | 2001-09-19 | 2002-09-18 | Hot cathode of x-ray tube |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001284581A JP3699666B2 (ja) | 2001-09-19 | 2001-09-19 | X線管の熱陰極 |
Publications (3)
Publication Number | Publication Date |
---|---|
JP2003092076A JP2003092076A (ja) | 2003-03-28 |
JP2003092076A5 true JP2003092076A5 (ja) | 2004-12-16 |
JP3699666B2 JP3699666B2 (ja) | 2005-09-28 |
Family
ID=19107875
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2001284581A Expired - Fee Related JP3699666B2 (ja) | 2001-09-19 | 2001-09-19 | X線管の熱陰極 |
Country Status (3)
Country | Link |
---|---|
US (1) | US6738453B2 (ja) |
EP (1) | EP1296350B1 (ja) |
JP (1) | JP3699666B2 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8824637B2 (en) | 2008-09-13 | 2014-09-02 | Rapiscan Systems, Inc. | X-ray tubes |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8094784B2 (en) | 2003-04-25 | 2012-01-10 | Rapiscan Systems, Inc. | X-ray sources |
US9208988B2 (en) | 2005-10-25 | 2015-12-08 | Rapiscan Systems, Inc. | Graphite backscattered electron shield for use in an X-ray tube |
GB0525593D0 (en) | 2005-12-16 | 2006-01-25 | Cxr Ltd | X-ray tomography inspection systems |
US8243876B2 (en) | 2003-04-25 | 2012-08-14 | Rapiscan Systems, Inc. | X-ray scanners |
GB0812864D0 (en) | 2008-07-15 | 2008-08-20 | Cxr Ltd | Coolign anode |
GB0309383D0 (en) * | 2003-04-25 | 2003-06-04 | Cxr Ltd | X-ray tube electron sources |
US10483077B2 (en) | 2003-04-25 | 2019-11-19 | Rapiscan Systems, Inc. | X-ray sources having reduced electron scattering |
US9046465B2 (en) | 2011-02-24 | 2015-06-02 | Rapiscan Systems, Inc. | Optimization of the source firing pattern for X-ray scanning systems |
GB0901338D0 (en) | 2009-01-28 | 2009-03-11 | Cxr Ltd | X-Ray tube electron sources |
US9524845B2 (en) * | 2012-01-18 | 2016-12-20 | Varian Medical Systems, Inc. | X-ray tube cathode with magnetic electron beam steering |
CN103337442B (zh) * | 2013-04-27 | 2016-06-08 | 中国人民解放军北京军区总医院 | 基于LaB6纳米材料热发射的X射线管及移动CT扫描仪 |
US9711320B2 (en) * | 2014-04-29 | 2017-07-18 | General Electric Company | Emitter devices for use in X-ray tubes |
US10825634B2 (en) * | 2019-02-21 | 2020-11-03 | Varex Imaging Corporation | X-ray tube emitter |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5568056A (en) * | 1978-11-17 | 1980-05-22 | Hitachi Ltd | X-ray tube |
DE4026299A1 (de) * | 1990-08-20 | 1992-02-27 | Siemens Ag | Roentgenanordnung mit einem roentgenstrahler |
DE19513290C1 (de) * | 1995-04-07 | 1996-07-25 | Siemens Ag | Röntgenröhre mit einem Niedrigtemperatur-Emitter |
JPH10321119A (ja) | 1997-05-15 | 1998-12-04 | Rigaku Corp | 熱電子放出フィラメントおよび熱電子放出装置 |
US6115453A (en) * | 1997-08-20 | 2000-09-05 | Siemens Aktiengesellschaft | Direct-Heated flats emitter for emitting an electron beam |
JP3561664B2 (ja) | 1999-09-14 | 2004-09-02 | 株式会社リガク | X線管の熱陰極及びその製造方法 |
DE10025807A1 (de) * | 2000-05-24 | 2001-11-29 | Philips Corp Intellectual Pty | Röntgenröhre mit Flachkathode |
-
2001
- 2001-09-19 JP JP2001284581A patent/JP3699666B2/ja not_active Expired - Fee Related
-
2002
- 2002-09-17 US US10/245,660 patent/US6738453B2/en not_active Expired - Fee Related
- 2002-09-18 EP EP02020891A patent/EP1296350B1/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8824637B2 (en) | 2008-09-13 | 2014-09-02 | Rapiscan Systems, Inc. | X-ray tubes |
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