GB1234517A - - Google Patents
Info
- Publication number
- GB1234517A GB1234517A GB1234517DA GB1234517A GB 1234517 A GB1234517 A GB 1234517A GB 1234517D A GB1234517D A GB 1234517DA GB 1234517 A GB1234517 A GB 1234517A
- Authority
- GB
- United Kingdom
- Prior art keywords
- grid
- cathode
- anode
- screen
- electron
- 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
- 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
- H01J3/029—Schematic arrangements for beam forming
Landscapes
- Electron Sources, Ion Sources (AREA)
- Microwave Tubes (AREA)
Abstract
1,234,517. Electron -guns.- ALCATEL-. HEURTEY. 28 April, :1969 '[26 April; .1968].. No. 21461/69. Heading H1D. An electron gun includes both a screen grid in contact with the emissive surface of the cathode, and an extraction grid the apertures of which are aligned with those of the screen grid and which is located between the -screen. grid and the anode, such that when increasingly positive potentials are applied to the cathode, the extraction grid, and the anode,.respectively, the electrons pass .through the grid apertures without impinging on the extraction grid, and thereafter merge into a single collimated beam. The thermionic cathode 1 is supported at the end of a- .metal tube 2 and is heated, either directly by, or by electron bombardment from, a filament 4 mounted within -a úurther metal - tube 7. A grid 10-which may be of honeycomb form (Fig. 2, not shown )-and a second similar.grid 15 is mounted in a ring 11 and metal cylinder 12. The'cathode, the grid 15,-and. the anode 17, are held at successively higher positive potentials, such that .the elementary electron beams issuing from grid 15 are converged to form a single" parallel beam, while grid 10 also ,prevents the emission of such electrons as would impact the grid 15. The cathode and grid 10 may together be-constituted by a matrix of non-emissive material into which an array of pellets of emissive material .is embedded, or grid 10 may be coated on the cathode surface.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR149764 | 1968-04-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1234517A true GB1234517A (en) | 1971-06-03 |
Family
ID=8649513
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1234517D Expired GB1234517A (en) | 1968-04-26 | 1969-04-28 |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US3651360A (en) |
| BE (1) | BE731965A (en) |
| DE (1) | DE1919451B2 (en) |
| FR (1) | FR1582070A (en) |
| GB (1) | GB1234517A (en) |
| LU (1) | LU58469A1 (en) |
| NL (1) | NL6906459A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3311016A1 (en) * | 1982-03-29 | 1983-10-13 | Litton Systems, Inc., 90210 Beverly Hills, Calif. | ELECTRONIC RADIATOR WORKING WITH TWO PERFORMANCES |
| GB2326272A (en) * | 1997-06-13 | 1998-12-16 | Eev Ltd | Grids for electron beam tubes |
| US6741717B2 (en) | 2001-09-28 | 2004-05-25 | Mitel Knowledge Corporation | Device for reducing structural-acoustic coupling between the diaphragm vibration field and the enclosure acoustic modes |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3983446A (en) * | 1971-07-06 | 1976-09-28 | Varian Associates | Gridded convergent flow electron gun for linear beam tubes |
| DE2210160C3 (en) * | 1972-03-02 | 1975-04-30 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Electron gun system for time-of-flight tubes |
| IL43254A (en) * | 1972-09-28 | 1976-02-29 | Varian Ass Ciates | Gridded electron gun employing a concave cathode emitter |
| US3852633A (en) * | 1972-12-13 | 1974-12-03 | Varian Associates | Gridded electron gun |
| US3818260A (en) * | 1973-03-05 | 1974-06-18 | Sperry Rand Corp | Electron gun with masked cathode and non-intercepting control grid |
| US4680500A (en) * | 1986-03-06 | 1987-07-14 | The United States Of America As Represented By The Secretary Of The Air Force | Integral grid/cathode for vacuum tubes |
| US7345290B2 (en) * | 1999-10-07 | 2008-03-18 | Agere Systems Inc | Lens array for electron beam lithography tool |
| FR2861215B1 (en) * | 2003-10-20 | 2006-05-19 | Calhene | ELECTRON GUN WITH FOCUSING ANODE, FORMING A WINDOW OF THIS CANON, APPLICATION TO IRRADIATION AND STERILIZATION |
| WO2008050670A1 (en) * | 2006-10-23 | 2008-05-02 | Ulvac, Inc. | Method of controlling electron beam focusing of pierce type electron gun and control device therefor |
| US8339024B2 (en) * | 2009-07-20 | 2012-12-25 | Hitachi Zosen Corporation | Methods and apparatuses for reducing heat on an emitter exit window |
| FR3077922B1 (en) * | 2018-02-15 | 2020-11-27 | Thales Sa | CIRCULAR GRID FOR A CYLINDRICAL CATHODE OF HYPERFREQUENCY TUBE WITH LINEAR BEAM, AND ASSOCIATED REMOVAL PROCESS |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2398829A (en) * | 1941-05-28 | 1946-04-23 | Rca Corp | Electron discharge device |
| US2758234A (en) * | 1952-11-28 | 1956-08-07 | Loewe Opta Ag | Electrode system for cathode ray tubes |
| US3107313A (en) * | 1959-10-30 | 1963-10-15 | Johann R Hechtel | Velocity modulated electron tube with cathode means providing plural electron streams |
| US3154711A (en) * | 1961-06-19 | 1964-10-27 | Gen Electric | Electron beam focusing by means of contact differences of potential |
| US3558967A (en) * | 1969-06-16 | 1971-01-26 | Varian Associates | Linear beam tube with plural cathode beamlets providing a convergent electron stream |
-
1968
- 1968-04-26 FR FR149764A patent/FR1582070A/fr not_active Expired
-
1969
- 1969-04-07 DE DE19691919451 patent/DE1919451B2/en active Granted
- 1969-04-23 LU LU58469D patent/LU58469A1/xx unknown
- 1969-04-23 US US818735A patent/US3651360A/en not_active Expired - Lifetime
- 1969-04-23 BE BE731965D patent/BE731965A/xx unknown
- 1969-04-25 NL NL6906459A patent/NL6906459A/xx unknown
- 1969-04-28 GB GB1234517D patent/GB1234517A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3311016A1 (en) * | 1982-03-29 | 1983-10-13 | Litton Systems, Inc., 90210 Beverly Hills, Calif. | ELECTRONIC RADIATOR WORKING WITH TWO PERFORMANCES |
| GB2117967A (en) * | 1982-03-29 | 1983-10-19 | Litton Systems Inc | Dual-mode electron gun |
| GB2326272A (en) * | 1997-06-13 | 1998-12-16 | Eev Ltd | Grids for electron beam tubes |
| US6741717B2 (en) | 2001-09-28 | 2004-05-25 | Mitel Knowledge Corporation | Device for reducing structural-acoustic coupling between the diaphragm vibration field and the enclosure acoustic modes |
Also Published As
| Publication number | Publication date |
|---|---|
| US3651360A (en) | 1972-03-21 |
| LU58469A1 (en) | 1969-07-22 |
| NL6906459A (en) | 1969-10-28 |
| DE1919451B2 (en) | 1972-07-06 |
| FR1582070A (en) | 1969-09-26 |
| BE731965A (en) | 1969-10-01 |
| DE1919451A1 (en) | 1969-11-06 |
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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 |