GB1281913A - A structure for providing controllable electron emission - Google Patents
A structure for providing controllable electron emissionInfo
- Publication number
- GB1281913A GB1281913A GB44294/69A GB4429469A GB1281913A GB 1281913 A GB1281913 A GB 1281913A GB 44294/69 A GB44294/69 A GB 44294/69A GB 4429469 A GB4429469 A GB 4429469A GB 1281913 A GB1281913 A GB 1281913A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cathode
- control electrode
- coating
- sept
- coated
- 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
- 239000011248 coating agent Substances 0.000 abstract 3
- 238000000576 coating method Methods 0.000 abstract 3
- 239000000463 material Substances 0.000 abstract 3
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 abstract 2
- QIJNJJZPYXGIQM-UHFFFAOYSA-N 1lambda4,2lambda4-dimolybdacyclopropa-1,2,3-triene Chemical compound [Mo]=C=[Mo] QIJNJJZPYXGIQM-UHFFFAOYSA-N 0.000 abstract 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 abstract 1
- 229910039444 MoC Inorganic materials 0.000 abstract 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 abstract 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 abstract 1
- 150000004645 aluminates Chemical class 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
- 230000008021 deposition Effects 0.000 abstract 1
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 abstract 1
- 229910052741 iridium Inorganic materials 0.000 abstract 1
- GKOZUEZYRPOHIO-UHFFFAOYSA-N iridium atom Chemical compound [Ir] GKOZUEZYRPOHIO-UHFFFAOYSA-N 0.000 abstract 1
- 229910052762 osmium Inorganic materials 0.000 abstract 1
- SYQBFIAQOQZEGI-UHFFFAOYSA-N osmium atom Chemical compound [Os] SYQBFIAQOQZEGI-UHFFFAOYSA-N 0.000 abstract 1
- 229910052697 platinum Inorganic materials 0.000 abstract 1
- 229910052719 titanium Inorganic materials 0.000 abstract 1
- 239000010936 titanium Substances 0.000 abstract 1
- PBYZMCDFOULPGH-UHFFFAOYSA-N tungstate Chemical compound [O-][W]([O-])(=O)=O PBYZMCDFOULPGH-UHFFFAOYSA-N 0.000 abstract 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 abstract 1
- 229910052721 tungsten Inorganic materials 0.000 abstract 1
- 239000010937 tungsten Substances 0.000 abstract 1
- 229910052726 zirconium Inorganic materials 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J21/00—Vacuum tubes
- H01J21/36—Tubes with flat electrodes, e.g. disc electrode
-
- 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
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J3/00—Details of electron-optical or ion-optical arrangements or of ion traps common to two or more basic types of discharge tubes or lamps
- H01J3/02—Electron guns
- H01J3/027—Construction of the gun or parts thereof
Landscapes
- Solid Thermionic Cathode (AREA)
- Electrodes For Cathode-Ray Tubes (AREA)
- Microwave Tubes (AREA)
Abstract
1281913 Thermionic cathode tubes; cathode constructions GENERAL ELECTRIC CO 8 Sept 1969 [26 Sept 1968] 44294/69 Heading H1D An electron discharge device, e.g. a power triode, has a cathode 1, for example a porous tungsten body impregnated with the aluminate or tungstate of barium and calcium, which has a surface, facing an adjacent control electrode 6 in the form of a mesh, on which is provided a coating 12 of a material in a pattern which is in exact alignment with the mesh openings in the control electrode. The coating material combines with the electron emissive material to provide in alignment with the mesh openings regions having a lower work function than the uncoated regions. The coating 12, which is preferably deposited on the cathode 1 through the control electrode 6 after it has been mounted adjacent to it, may be of osmium or iridium. The arrangement forms a bi-potential cathode, and with a cathode-control grid spacing of 0À001 inch a 0À2 volt negative potential exists between the coated and uncoated regions of the cathode which tends to focus the electrons emitted and channel them into the grid apertures to reduce the grid current collection. Before the deposition of the patterned layer 12 the entire surface of the cathode may be coated with molybdenum carbide, titanium, zirconium or platinum. The cathode body 1 may be supported on a hafnium foil cylinder 2.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US76279768A | 1968-09-26 | 1968-09-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1281913A true GB1281913A (en) | 1972-07-19 |
Family
ID=25066056
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB44294/69A Expired GB1281913A (en) | 1968-09-26 | 1969-09-08 | A structure for providing controllable electron emission |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US3648096A (en) |
| DE (1) | DE1948820A1 (en) |
| FR (1) | FR2063018A1 (en) |
| GB (1) | GB1281913A (en) |
| NL (1) | NL6914678A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0004424A1 (en) * | 1978-03-23 | 1979-10-03 | Thorn Emi-Varian Limited | Thermionic cathode |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2449796C3 (en) * | 1974-10-19 | 1980-03-06 | Philips Patentverwaltung Gmbh, 2000 Hamburg | Supply cathode for a grid-controlled electron tube and process for their manufacture |
| US3967150A (en) * | 1975-01-31 | 1976-06-29 | Varian Associates | Grid controlled electron source and method of making same |
| US4263528A (en) * | 1978-05-03 | 1981-04-21 | Varian Associates, Inc. | Grid coating for thermionic electron emission suppression |
| US4250428A (en) * | 1979-05-09 | 1981-02-10 | The United States Of America As Represented By The Secretary Of The Army | Bonded cathode and electrode structure with layered insulation, and method of manufacture |
| FR2469792A1 (en) * | 1979-11-09 | 1981-05-22 | Thomson Csf | THERMO-IONIC CATHODE, ITS MANUFACTURING METHOD, AND ELECTRONIC TUBE INCORPORATING SUCH A CATHODE |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1632135A (en) * | 1920-04-01 | 1927-06-14 | Western Electric Co | Electrode structure for electron-discharge devices |
| NL6504397A (en) * | 1965-04-07 | 1966-10-10 |
-
1968
- 1968-09-26 US US762797A patent/US3648096A/en not_active Expired - Lifetime
-
1969
- 1969-09-08 GB GB44294/69A patent/GB1281913A/en not_active Expired
- 1969-09-26 FR FR6933045A patent/FR2063018A1/fr not_active Withdrawn
- 1969-09-26 NL NL6914678A patent/NL6914678A/xx unknown
- 1969-09-26 DE DE19691948820 patent/DE1948820A1/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0004424A1 (en) * | 1978-03-23 | 1979-10-03 | Thorn Emi-Varian Limited | Thermionic cathode |
Also Published As
| Publication number | Publication date |
|---|---|
| US3648096A (en) | 1972-03-07 |
| NL6914678A (en) | 1970-04-01 |
| DE1948820A1 (en) | 1970-04-02 |
| FR2063018A1 (en) | 1971-07-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| CSNS | Application of which complete specification have been accepted and published, but patent is not sealed |