GB543595A - Improvements in or relating to cathodes for electron discharge devices - Google Patents
Improvements in or relating to cathodes for electron discharge devicesInfo
- Publication number
- GB543595A GB543595A GB13757/40A GB1375740A GB543595A GB 543595 A GB543595 A GB 543595A GB 13757/40 A GB13757/40 A GB 13757/40A GB 1375740 A GB1375740 A GB 1375740A GB 543595 A GB543595 A GB 543595A
- Authority
- GB
- United Kingdom
- Prior art keywords
- flutes
- cathodes
- ridges
- slots
- relating
- 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
- 238000010894 electron beam technology Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- H01J1/15—Cathodes heated directly by an electric current
- H01J1/16—Cathodes heated directly by an electric current characterised by the shape
Landscapes
- Microwave Tubes (AREA)
- Solid Thermionic Cathode (AREA)
Abstract
543,595. Thermionic cathodes. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Sept. 2. 1940, No. 13757. Convention date, Aug. 31, 1939. [Class 39 (i)] ] In cathodes such as described in Specification 540,015 wherein the emissive surfaces are formed in a number of flutes 3 emission at the meeting edges of these flutes is prevented..The flutes may be formed in separate strips 3, Fig. 6, the edges 9 of which are ground to a fine point or when the flutes are made in wide ribbons slots 8, Fig. 7, may be cut along or across -as at 14, Fig. 8-the ridges between the flutes. Rods 13 spotwelded to bridges 12 may extend along the ridges and being at cathode potential assist in forming electron beams from the fluted surfaces. The slots 8 need not pass right through the ribbon. The flutes may be used with tubular cathodes. Grids and water cooled anodes as set out in the prior Specification are used.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US292822A US2256297A (en) | 1939-08-31 | 1939-08-31 | Electron discharge device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB543595A true GB543595A (en) | 1942-03-04 |
Family
ID=23126341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB13757/40A Expired GB543595A (en) | 1939-08-31 | 1940-09-02 | Improvements in or relating to cathodes for electron discharge devices |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2256297A (en) |
| GB (1) | GB543595A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1133041B (en) * | 1954-10-22 | 1962-07-12 | Gen Electric | Process for the production of a heater or cathode body consisting of a thin film for a tube heated with high frequency and the heater or cathode body produced by the process |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2526054A (en) * | 1940-03-13 | 1950-10-17 | M O Valve Co Ltd | Electrode assembly for very highfrequency electron discharge devices |
| US2459841A (en) * | 1943-06-08 | 1949-01-25 | Glenn F Rouse | Cathode |
| US2419757A (en) * | 1944-05-31 | 1947-04-29 | Jr Abraham Binneweg | Mounted flat element radio tube |
| US2455287A (en) * | 1944-09-05 | 1948-11-30 | Nat Union Radio Corp | Cathode for electronic discharge devices |
| US2745017A (en) * | 1945-11-28 | 1956-05-08 | Frank F Oppenheimer | Ion producing mechanism |
| US2512859A (en) * | 1948-06-29 | 1950-06-27 | Rca Corp | Electron discharge power amplifier |
| US2727177A (en) * | 1952-02-11 | 1955-12-13 | Westinghouse Electric Corp | Electrostatic lens system |
| US2748310A (en) * | 1952-09-16 | 1956-05-29 | Machlett Lab Inc | Filament structure |
| US2847597A (en) * | 1955-11-25 | 1958-08-12 | Sylvania Electric Prod | Electron discharge device |
| DE2727907A1 (en) * | 1977-06-21 | 1979-01-18 | Siemens Ag | X-ray tube glow cathode |
| DE2916368C2 (en) * | 1979-04-23 | 1982-10-21 | Siemens AG, 1000 Berlin und 8000 München | Cathode for a gas discharge display device |
| DE3760462D1 (en) * | 1986-02-21 | 1989-09-21 | Siemens Ag | Glow cathode for an x-ray tube |
-
1939
- 1939-08-31 US US292822A patent/US2256297A/en not_active Expired - Lifetime
-
1940
- 1940-09-02 GB GB13757/40A patent/GB543595A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1133041B (en) * | 1954-10-22 | 1962-07-12 | Gen Electric | Process for the production of a heater or cathode body consisting of a thin film for a tube heated with high frequency and the heater or cathode body produced by the process |
Also Published As
| Publication number | Publication date |
|---|---|
| US2256297A (en) | 1941-09-16 |
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