GB309447A - Improvements in or relating to thermionic devices - Google Patents
Improvements in or relating to thermionic devicesInfo
- Publication number
- GB309447A GB309447A GB10952/29A GB1095229A GB309447A GB 309447 A GB309447 A GB 309447A GB 10952/29 A GB10952/29 A GB 10952/29A GB 1095229 A GB1095229 A GB 1095229A GB 309447 A GB309447 A GB 309447A
- Authority
- GB
- United Kingdom
- Prior art keywords
- vanes
- cathode
- cylinder
- nickel
- tungsten
- 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
- H01J17/00—Gas-filled discharge tubes with solid cathode
- H01J17/50—Thermionic-cathode tubes
- H01J17/52—Thermionic-cathode tubes with one cathode and one anode
- H01J17/54—Thermionic-cathode tubes with one cathode and one anode having one or more control electrodes
Landscapes
- Lasers (AREA)
- Electron Sources, Ion Sources (AREA)
- Discharge Lamp (AREA)
- Electrodes For Cathode-Ray Tubes (AREA)
Abstract
309,447. British Thomson-Houston Co., Ltd., (Assignees of Hull, A. W., and Ruggles, W. A.). April 10, 1928, [Convention date]. Vacuum tubes; low - pressure metallic-vapour apparatus. - Thermionic cathodes are formed with a hollow central support carrying a plurality of vanes, heating means for the support and vanes, and a surrounding member adapted to prevent loss of heat in order to obtain a high thermal efficiency of electron emission. In one example shown in Figs. 1 and 2, a stem 6 supports the cathode structure 7 and a grid 8 which may be formed of punched sheet metal supported by wires 9, 10 attached to a band 11, the wire 10 being extended and connected to a contact 12. The cathode 7 comprises a cylinder 13 of nickel nickel alloys, tungsten, or molybdenum containing thorium oxide and has an internal refractory insulating lining 14, a heater 17, and radial vanes 15 secured to a concentric cylinder 16 which may be polished externally. The ends of the heater 17 which may be of tungsten are connected by welding, riveting, or otherwise to the thickened end wall 18 of the cylinder 13 and a conductor 19 respectively, while the wires 20, 21 supporting the cylinder 16 and the wire 19 are sealed through the stem 6 and connected to contacts 23, 22. Heat conduction is reduced by cutting away the edges of the vanes 15 which may be of nickel or iron. Argon at a pressure of 50 microns or a vapour-yielding material is inserted in the envelope. When mercury is used, a shield 25 is mounted on the stem 6 to prevent heating of the base and the consequent formation of a high vapour pressure. The interior surface of the cathode and the vanes are coated with barium, caesium, cerium, a mixture such as misch metal, or oxides of these metals. A coating of barium carbonate may be applied to a nickel cathode which is then heated to 1300‹C, or thorium oxide may be used when the cathode is of tungsten or molybdenum. The vanes may consist of sheets of metal having bent end portions, Fig. 3, or may have a triangular shape, Fig. 4, or may be V-shaped, Fig. 5, the apex of the V being secured to the internal cylinder. One of more cylinders 30, 31, Fig. 5, may be provided to reduce heat radiation.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US268975A US1880092A (en) | 1928-04-10 | 1928-04-10 | Electron discharge device |
Publications (1)
Publication Number | Publication Date |
---|---|
GB309447A true GB309447A (en) | 1930-07-09 |
Family
ID=23025319
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB6159/29A Expired GB309442A (en) | 1928-04-10 | 1929-02-25 | Improvements in and relating to electron discharge devices |
GB10952/29A Expired GB309447A (en) | 1928-04-10 | 1929-04-09 | Improvements in or relating to thermionic devices |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB6159/29A Expired GB309442A (en) | 1928-04-10 | 1929-02-25 | Improvements in and relating to electron discharge devices |
Country Status (4)
Country | Link |
---|---|
US (1) | US1880092A (en) |
FR (1) | FR672920A (en) |
GB (2) | GB309442A (en) |
NL (1) | NL28915C (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2504713A (en) * | 1942-09-24 | 1950-04-18 | Gen Electric | Light sensitive electric discharge device and control circuits therefor |
US2717962A (en) * | 1944-03-31 | 1955-09-13 | Louis F Wouters | Electric discharge devices |
US2445462A (en) * | 1944-04-26 | 1948-07-20 | Westinghouse Electric Corp | Electrical discharge device and base |
US2579884A (en) * | 1947-12-11 | 1951-12-25 | Comb Control Corp | Flame failure safeguard |
US2872611A (en) * | 1953-11-16 | 1959-02-03 | Sylvania Electric Prod | Cathode |
-
0
- NL NL28915D patent/NL28915C/xx active
-
1928
- 1928-04-10 US US268975A patent/US1880092A/en not_active Expired - Lifetime
-
1929
- 1929-02-25 GB GB6159/29A patent/GB309442A/en not_active Expired
- 1929-04-09 GB GB10952/29A patent/GB309447A/en not_active Expired
- 1929-04-10 FR FR672920D patent/FR672920A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US1880092A (en) | 1932-09-27 |
NL28915C (en) | |
GB309442A (en) | 1930-08-25 |
FR672920A (en) | 1930-01-08 |
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