GB967273A - Improvements in cathodes and in the method of their manufacture - Google Patents
Improvements in cathodes and in the method of their manufactureInfo
- Publication number
- GB967273A GB967273A GB42109/60A GB4210960A GB967273A GB 967273 A GB967273 A GB 967273A GB 42109/60 A GB42109/60 A GB 42109/60A GB 4210960 A GB4210960 A GB 4210960A GB 967273 A GB967273 A GB 967273A
- Authority
- GB
- United Kingdom
- Prior art keywords
- emissive material
- core
- cathode
- tungsten
- thorium
- 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
- 238000004519 manufacturing process Methods 0.000 title 1
- 238000000034 method Methods 0.000 title 1
- 229910052776 Thorium Inorganic materials 0.000 abstract 3
- 239000000463 material Substances 0.000 abstract 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 abstract 3
- ZSLUVFAKFWKJRC-IGMARMGPSA-N 232Th Chemical compound [232Th] ZSLUVFAKFWKJRC-IGMARMGPSA-N 0.000 abstract 2
- 239000000203 mixture Substances 0.000 abstract 2
- 229910052721 tungsten Inorganic materials 0.000 abstract 2
- 239000010937 tungsten Substances 0.000 abstract 2
- 229910052726 zirconium Inorganic materials 0.000 abstract 2
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 abstract 1
- 239000010406 cathode material Substances 0.000 abstract 1
- 150000001875 compounds Chemical class 0.000 abstract 1
- 238000007598 dipping method Methods 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 238000003780 insertion Methods 0.000 abstract 1
- 230000037431 insertion Effects 0.000 abstract 1
- 229910044991 metal oxide Inorganic materials 0.000 abstract 1
- 150000004706 metal oxides Chemical class 0.000 abstract 1
- 239000008188 pellet Substances 0.000 abstract 1
- 239000003870 refractory metal Substances 0.000 abstract 1
- 230000008022 sublimation Effects 0.000 abstract 1
- 238000000859 sublimation Methods 0.000 abstract 1
- 239000000725 suspension Substances 0.000 abstract 1
- 238000004804 winding Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/04—Electrodes; Screens; Shields
- H01J61/06—Main electrodes
- H01J61/073—Main electrodes for high-pressure discharge lamps
- H01J61/0735—Main electrodes for high-pressure discharge lamps characterised by the material of the electrode
- H01J61/0737—Main electrodes for high-pressure discharge lamps characterised by the material of the electrode characterised by the electron emissive material
-
- 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
- H01J1/14—Solid thermionic cathodes characterised by the material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/04—Electrodes; Screens; Shields
- H01J61/06—Main electrodes
- H01J61/067—Main electrodes for low-pressure discharge lamps
- H01J61/0675—Main electrodes for low-pressure discharge lamps characterised by the material of the electrode
- H01J61/0677—Main electrodes for low-pressure discharge lamps characterised by the material of the electrode characterised by the electron emissive material
Landscapes
- Discharge Lamp (AREA)
Abstract
967,273. Cathode materials and processing. GENERAL ELECTRIC CORPORATION. Dec. 7, 1960 [Dec. 17, 1959], No. 42109/60. Heading H1D. A cathode, particularly for use in discharge lamps, comprises a conducting core and an emissive material corresponding to the formula wherein RO 2 is a highly refractory metal oxide resulting in transparent sublimation products, and 0.05 < #<0.5. Such a cathode may be made by dipping a core in a suspension of a mixture of a compound having the stoichiometric formula BaO.RO 2 with #R in powdered form, where R stands for thorium or zirconium, and heating. For example, the mixture may comprise BaThO 3 +0.2 Th and be heated to 750 C. or may comprise BaZrO 3 +0.25 Zr and be heated to 700 C. The core may comprise a tungsten wire filament in the form of a coiled coil with a triple overwound, or a single or double tungsten coil 7, 8 wound on a tungsten shank 9 with the insertion of a thorium sliver. As shown, the inner helix 7 has a greater winding pitch in its middle portion to leave cavities which are filled with the emissive material. Alternatively, the emissive material may be pressed and used in pellet form.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US860130A US3188236A (en) | 1959-12-17 | 1959-12-17 | Cathodes and method of manufacture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB967273A true GB967273A (en) | 1964-08-19 |
Family
ID=25332542
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB42109/60A Expired GB967273A (en) | 1959-12-17 | 1960-12-07 | Improvements in cathodes and in the method of their manufacture |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US3188236A (en) |
| GB (1) | GB967273A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0592915A1 (en) * | 1992-10-15 | 1994-04-20 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Low-pressure discharge lamp and process for producing a low-pressure discharge lamp |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1107617A (en) * | 1966-09-13 | 1968-03-27 | British Lighting Ind Ltd | An electrode for a high-pressure discharge lamp |
| US3530327A (en) * | 1968-03-11 | 1970-09-22 | Westinghouse Electric Corp | Metal halide discharge lamps with rare-earth metal oxide used as electrode emission material |
| US3653960A (en) * | 1970-03-23 | 1972-04-04 | Bell Telephone Labor Inc | Gas laser including cathode element |
| US3837909A (en) * | 1972-07-27 | 1974-09-24 | Itt | Coated coil emissive electrode |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1946603A (en) * | 1929-05-09 | 1934-02-13 | Electrons Inc | Cathode for electrical discharge devices |
| US2106733A (en) * | 1932-01-30 | 1938-02-01 | Rca Corp | Speed changing mechanism |
| BE460538A (en) * | 1944-01-19 | |||
| US2647067A (en) * | 1949-09-10 | 1953-07-28 | Eitel Mccullough Inc | Electron emitter for electron tubes |
| US2726178A (en) * | 1950-11-17 | 1955-12-06 | Rca Corp | Thermionic cathode with thoria coating |
| US2687489A (en) * | 1952-06-26 | 1954-08-24 | Hanovia Chemical & Mfg Co | Electrode |
| DE1025999B (en) * | 1953-03-04 | 1958-03-13 | Egyesuelt Izzolampa | Supply cathode in which the supply, at least after activation, has a content of barium oxide |
| US2878409A (en) * | 1957-04-29 | 1959-03-17 | Philips Corp | Dispenser-type cathode and method of making |
| NL112306C (en) * | 1957-04-29 |
-
1959
- 1959-12-17 US US860130A patent/US3188236A/en not_active Expired - Lifetime
-
1960
- 1960-12-07 GB GB42109/60A patent/GB967273A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0592915A1 (en) * | 1992-10-15 | 1994-04-20 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Low-pressure discharge lamp and process for producing a low-pressure discharge lamp |
| US5614784A (en) * | 1992-10-15 | 1997-03-25 | Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh | Discharge lamp, particularly cold-start fluorescent lamp, and method of its manufacture |
Also Published As
| Publication number | Publication date |
|---|---|
| US3188236A (en) | 1965-06-08 |
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