GB1378733A - Indirectly heated type cathode devices - Google Patents
Indirectly heated type cathode devicesInfo
- Publication number
- GB1378733A GB1378733A GB2022273A GB2022273A GB1378733A GB 1378733 A GB1378733 A GB 1378733A GB 2022273 A GB2022273 A GB 2022273A GB 2022273 A GB2022273 A GB 2022273A GB 1378733 A GB1378733 A GB 1378733A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mixture
- heater
- substrate
- casing
- april
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
- H01J1/02—Main electrodes
- H01J1/13—Solid thermionic cathodes
- H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
- H01J1/24—Insulating layer or body located between heater and emissive material
Landscapes
- Solid Thermionic Cathode (AREA)
- Electrodes For Cathode-Ray Tubes (AREA)
Abstract
1378733 Thermionic cathode constructions TOKYO SHIBAURA ELECTRIC CO Ltd 27 April 1973 [28 April 1972] 20222/73 Heading H1D An indirectly heated cathode comprises a hollow casing 1 containing a mixture 3, 4 of a metal and an insulating and heat resistive material, an emissive substrate 2 mounted at one end of the casing and a metal foil heater 5 embedded in the mixture and spaced from the substrate. A concave porous disc 2 is brazed to a Mo cylinder and covered with a layer 4 of the mixture. A flat spiral W foil heater 5 is added and covered with a mixture of Al 2 O 3 and Mo powders. This is compressed with a die 6 and sintered. The inner surface of substrate 2 and the heater may both be concave. The mixture may comprise Y 2 O 3 , ZrO, HfO 2 , BeO 2 , MgO or a rare earth oxide and W, Ni, Re, Ta, Ti, Zr, Hf, V, Nb, Cr or elements of the Pt group. The cylinder may be coated with Ru-Mo alloy. The heater may comprise one spiral or two interleaved spirals joined at their centres. It is etched from sheet then shaped under pressure at 1700‹ C. It may be coated with an insulating oxide film. A thin heater permits the use of a shorter casing thereby reducing heat losses and shortening starting time. The cathode is used in klystrons and travelling wave tubes.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4278772A JPS495262A (en) | 1972-04-28 | 1972-04-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1378733A true GB1378733A (en) | 1974-12-27 |
Family
ID=12645661
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2022273A Expired GB1378733A (en) | 1972-04-28 | 1973-04-27 | Indirectly heated type cathode devices |
Country Status (3)
Country | Link |
---|---|
US (1) | US3803441A (en) |
JP (1) | JPS495262A (en) |
GB (1) | GB1378733A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2268325A (en) * | 1992-07-01 | 1994-01-05 | Thorn Emi Electronics Ltd | Thermionic cathode structure. |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
HU179748B (en) * | 1974-01-15 | 1982-12-28 | Ferenc Puskas | Cathode of a metal ceramic sintered body produced by dust metalurgy for closing discharge tube of sodium vapour lamp and process for the production thereof |
JPS5525066B2 (en) * | 1974-10-30 | 1980-07-03 | ||
US4268775A (en) * | 1978-03-13 | 1981-05-19 | Anthony J. Barraco | Cathode-heater assembly and support structure therefor |
FR2476386A1 (en) * | 1980-02-15 | 1981-08-21 | Thomson Csf | INDIRECT HEATING CATHODE HEATING ELEMENT, METHOD OF MANUFACTURING THE SAME, AND INDIRECT HEATING CATHODE COMPRISING SUCH A MEMBER |
NL8100928A (en) * | 1981-02-26 | 1982-09-16 | Philips Nv | OXYD CATHODE. |
US5350969A (en) * | 1991-12-03 | 1994-09-27 | Litton Systems, Inc. | Cathode heater and cathode assembly for microwave power tubes |
CN102446680A (en) * | 2010-10-13 | 2012-05-09 | 北京中科信电子装备有限公司 | Novel emission electron cathode for effectively increasing multi-charge ion yield |
FR2997548A1 (en) * | 2012-10-26 | 2014-05-02 | Thales Sa | FAST-START THERMOELECTRONIC EMISSION CATHODE AND PROCESS FOR PREPARING THE SAME |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS433701Y1 (en) * | 1967-07-26 | 1968-02-16 |
-
1972
- 1972-04-28 JP JP4278772A patent/JPS495262A/ja active Pending
-
1973
- 1973-04-26 US US00354808A patent/US3803441A/en not_active Expired - Lifetime
- 1973-04-27 GB GB2022273A patent/GB1378733A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2268325A (en) * | 1992-07-01 | 1994-01-05 | Thorn Emi Electronics Ltd | Thermionic cathode structure. |
GB2268325B (en) * | 1992-07-01 | 1996-01-03 | Thorn Emi Electronics Ltd | Thermionic cathode structure |
Also Published As
Publication number | Publication date |
---|---|
DE2321516B2 (en) | 1976-01-08 |
US3803441A (en) | 1974-04-09 |
JPS495262A (en) | 1974-01-17 |
DE2321516A1 (en) | 1973-11-15 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
435 | Patent endorsed 'licences of right' on the date specified (sect. 35/1949) | ||
PCNP | Patent ceased through non-payment of renewal fee |