GB1424167A - Cathode assembly for a travelling-wave tube - Google Patents
Cathode assembly for a travelling-wave tubeInfo
- Publication number
- GB1424167A GB1424167A GB1297974A GB1297974A GB1424167A GB 1424167 A GB1424167 A GB 1424167A GB 1297974 A GB1297974 A GB 1297974A GB 1297974 A GB1297974 A GB 1297974A GB 1424167 A GB1424167 A GB 1424167A
- Authority
- GB
- United Kingdom
- Prior art keywords
- foil
- cathode
- wave tube
- projections
- heat
- 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
- 239000011888 foil Substances 0.000 abstract 5
- 239000011324 bead Substances 0.000 abstract 1
- 238000010276 construction Methods 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 229910052751 metal Inorganic materials 0.000 abstract 1
- 229910052750 molybdenum Inorganic materials 0.000 abstract 1
- 229910052758 niobium Inorganic materials 0.000 abstract 1
- 229910052702 rhenium Inorganic materials 0.000 abstract 1
- 229910052715 tantalum Inorganic materials 0.000 abstract 1
- 229910052721 tungsten Inorganic materials 0.000 abstract 1
- 238000004804 winding Methods 0.000 abstract 1
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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
- H01J23/02—Electrodes; Magnetic control means; Screens
- H01J23/04—Cathodes
Landscapes
- Solid Thermionic Cathode (AREA)
- Microwave Tubes (AREA)
Abstract
1424167 Thermionic cathode constructions HUGHES AIRCRAFT CO 22 March 1974 [9 April 1973] 12979/74 Heading H1D To reduce heat losses in a cathode for a travelling wave tube a heat reflecting shield 40 is wound coaxially round thermionic cathode 10, the shield comprising a thin metal foil of low thermal conductivity, low emissivity; with a polished heat reflecting surface and projections 45 which extend from the foil surface to separate adjacent windings. The cathode includes a Mo emitter 11, a heater 20 and two heat shields 40, 50 around the cathode and heater respectively. The foil is of Re, Nb, Ta, Mo or W and the shields comprise about 40 turns. The projections are either pressed in the foil or beads welded to the foil.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US00349156A US3814974A (en) | 1973-04-09 | 1973-04-09 | Cathode gun device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1424167A true GB1424167A (en) | 1976-02-11 |
Family
ID=23371139
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1297974A Expired GB1424167A (en) | 1973-04-09 | 1974-03-22 | Cathode assembly for a travelling-wave tube |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US3814974A (en) |
| JP (1) | JPS503568A (en) |
| DE (1) | DE2415152B2 (en) |
| FR (1) | FR2224868B1 (en) |
| GB (1) | GB1424167A (en) |
| NL (1) | NL163665C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51112166A (en) * | 1975-03-27 | 1976-10-04 | Matsushita Electric Ind Co Ltd | Impregnated cathode |
| JPS5458344A (en) * | 1977-10-19 | 1979-05-11 | Hitachi Ltd | Thermal electron radiation cathode |
| JPS5574032A (en) * | 1978-11-29 | 1980-06-04 | Nec Corp | Indirectly-heated cathode |
| GB2176337B (en) * | 1985-06-04 | 1990-02-14 | English Electric Valve Co Ltd | Metal vapour laser apparatus |
| US5202910A (en) * | 1990-08-28 | 1993-04-13 | North American Philips Corporation | Anode for arc discharge devices |
| US10825634B2 (en) * | 2019-02-21 | 2020-11-03 | Varex Imaging Corporation | X-ray tube emitter |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2899591A (en) * | 1959-08-11 | Electrical heating device | ||
| US2391927A (en) * | 1944-01-08 | 1946-01-01 | Standard Telephones Cables Ltd | Electron discharge device |
| US2518879A (en) * | 1945-02-03 | 1950-08-15 | Kenneth J Germeshausen | Hydrogen thyratron |
| US2577239A (en) * | 1949-09-12 | 1951-12-04 | Eitel Mccullough Inc | Cathode and heater structure for electron tubes |
| US2888592A (en) * | 1954-07-22 | 1959-05-26 | Gen Electric | Cathode structure |
| US3204140A (en) * | 1961-07-10 | 1965-08-31 | Gen Electric | Hot cathode electron tube |
-
1973
- 1973-04-09 US US00349156A patent/US3814974A/en not_active Expired - Lifetime
-
1974
- 1974-03-22 GB GB1297974A patent/GB1424167A/en not_active Expired
- 1974-03-27 NL NL7404189.A patent/NL163665C/en not_active IP Right Cessation
- 1974-03-29 DE DE2415152A patent/DE2415152B2/en active Granted
- 1974-03-29 FR FR7411219A patent/FR2224868B1/fr not_active Expired
- 1974-04-09 JP JP49039568A patent/JPS503568A/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE2415152A1 (en) | 1974-11-21 |
| FR2224868B1 (en) | 1977-09-30 |
| NL163665C (en) | 1980-09-15 |
| JPS503568A (en) | 1975-01-14 |
| US3814974A (en) | 1974-06-04 |
| NL7404189A (en) | 1974-10-11 |
| FR2224868A1 (en) | 1974-10-31 |
| NL163665B (en) | 1980-04-15 |
| DE2415152B2 (en) | 1975-07-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |