GB1191550A - A Dispenser Cathode - Google Patents
A Dispenser CathodeInfo
- Publication number
- GB1191550A GB1191550A GB61229/68A GB6122968A GB1191550A GB 1191550 A GB1191550 A GB 1191550A GB 61229/68 A GB61229/68 A GB 61229/68A GB 6122968 A GB6122968 A GB 6122968A GB 1191550 A GB1191550 A GB 1191550A
- Authority
- GB
- United Kingdom
- Prior art keywords
- channel
- annular
- dec
- heater
- outer circumferential
- 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
- 238000009413 insulation Methods 0.000 abstract 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 abstract 1
- 239000004411 aluminium Substances 0.000 abstract 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract 1
- 229910052782 aluminium Inorganic materials 0.000 abstract 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 1
- 229910052788 barium Inorganic materials 0.000 abstract 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 abstract 1
- 229910052791 calcium Inorganic materials 0.000 abstract 1
- 239000011575 calcium Substances 0.000 abstract 1
- 238000010276 construction Methods 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 239000000203 mixture Substances 0.000 abstract 1
- 239000000843 powder Substances 0.000 abstract 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 abstract 1
- 239000010937 tungsten Substances 0.000 abstract 1
- 229910052721 tungsten Inorganic materials 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
- H01J1/28—Dispenser-type cathodes, e.g. L-cathode
Landscapes
- Solid Thermionic Cathode (AREA)
- Microwave Tubes (AREA)
- Electron Sources, Ion Sources (AREA)
Abstract
1,191,550. Thermionic cathode constructions. TOKYO SHIBAURA ELECTRIC CO. Ltd. 24 Dec., 1968 [27 Dec., 1967], No. 61229/68. Heading H1D. A dispenser cathode comprises a heater 12 housed in insulation 11 within a hollow chamber 10 defined by nested inner and outer circumferential walls and a top plate 14 supporting the porous impregnated electron emissive layer 16, and a cylinder 17, preferably metallic, which is disposed spaced from and at least partly coextensive with the inner wall of the channel 10 to reduce heat losses therefrom. Preferably the chamber is annular and the heater 12 is an insulated annular coil disposed in alumina powder insulation 11. Emissive layer 16 may be of porous tungsten filled with a mixture of the oxides of aluminium, barium and calcium in the ratio 3 : 5 : 2 which is activated by heating to 1600-1700 C. In the Fig. 4 embodiment (not shown), the annular plate 14 is integrally formed with the inner and outer circumferential walls of the channel 10 and a separate annular disc closes the bottom of the channel. The channel may also, for example, be square or hexagonal in shape.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10860467 | 1967-12-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1191550A true GB1191550A (en) | 1970-05-13 |
Family
ID=14488997
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB61229/68A Expired GB1191550A (en) | 1967-12-27 | 1968-12-24 | A Dispenser Cathode |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US3569769A (en) |
| GB (1) | GB1191550A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3798492A (en) * | 1971-05-17 | 1974-03-19 | Itt | Emissive electrode |
| US3760218A (en) * | 1972-04-10 | 1973-09-18 | Spectramat Inc | Thermionic cathode |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1052000A (en) * | ||||
| US2280980A (en) * | 1941-01-21 | 1942-04-28 | Bell Telephone Labor Inc | Electron discharge device |
| US3195003A (en) * | 1962-11-16 | 1965-07-13 | Westinghouse Electric Corp | Electron discharge device |
| US3369145A (en) * | 1965-04-09 | 1968-02-13 | Wagner Electric Corp | Thermionic emissive cathode |
| US3351795A (en) * | 1966-03-29 | 1967-11-07 | Hughes Aircraft Co | Annular beam flood gun for storage tubes |
| US3441779A (en) * | 1966-04-06 | 1969-04-29 | Siemens Ag | Cathode having an end face carrier for an emission substance and the production thereof |
-
1968
- 1968-12-23 US US786112A patent/US3569769A/en not_active Expired - Lifetime
- 1968-12-24 GB GB61229/68A patent/GB1191550A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE1816807A1 (en) | 1969-07-31 |
| US3569769A (en) | 1971-03-09 |
| DE1816807B2 (en) | 1972-10-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |