GB227858A - Improvements relating to vacuum electric discharge devices - Google Patents
Improvements relating to vacuum electric discharge devicesInfo
- Publication number
- GB227858A GB227858A GB1398/25A GB139825A GB227858A GB 227858 A GB227858 A GB 227858A GB 1398/25 A GB1398/25 A GB 1398/25A GB 139825 A GB139825 A GB 139825A GB 227858 A GB227858 A GB 227858A
- Authority
- GB
- United Kingdom
- Prior art keywords
- anode
- caesium
- cathode
- heated
- temperature
- 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
- H01J27/00—Ion beam tubes
- H01J27/02—Ion sources; Ion guns
- H01J27/26—Ion sources; Ion guns using surface ionisation, e.g. field effect ion sources, thermionic ion sources
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
- H01J19/68—Specified gas introduced into the tube at low pressure, e.g. for reducing or influencing space charge
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Discharge Lamp (AREA)
Abstract
227,858. Westinghouse Electric & Manufacturing Co., (Assignees of O'Brien, B.). Jan. 16, 1924, '[Convention date]. Void [Published under Sect. 91 of the Act]. Low - pressure metallicvapour apparatus; vacuum tubes.-A discharge tube in which the current is carried by a stream of electrons emitted from a cathode is provided with means whereby the anode is caused to emit positive ions. For this purpose a substance such as caesium may be inserted in an exhausted bulb, and the anode heated to a temperature at which caesium atoms striking it are evaporated as positively-charged caesium ions; the adsorbed film of caesium produced on the cathode also improves the electron emissivity. The arrangement enables lower voltages to be used between the electrodes. Tungsten is a suitable metal for the electrodes. As shown, a cylindrical cathode 21 is mounted around a control electrode 19, preferably of tungsten, and an anode consisting of a metallic core 16 with a winding 17 and a cylindrical cover 18. The bulb is exhausted and is in communication with a side tube 9 containing caesium 11. The anode is heated inductively by the winding to a temperature above the critical temperature at which the Richardson work function exceeds the ionizing potential of caesium. The cathode is heated by radiation from the anode. In another arrangement une cathode and anode consist of filaments, and the anode is heated to a higher temperature than the cathode which is only slightly heated.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US227858XA | 1924-01-16 | 1924-01-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB227858A true GB227858A (en) | 1925-07-02 |
Family
ID=21811432
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1398/25A Expired GB227858A (en) | 1924-01-16 | 1925-01-16 | Improvements relating to vacuum electric discharge devices |
Country Status (2)
Country | Link |
---|---|
FR (1) | FR591498A (en) |
GB (1) | GB227858A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1698878A1 (en) * | 2005-03-04 | 2006-09-06 | Inficon GmbH | Electrode configuration and pressure measuring apparatus |
-
1925
- 1925-01-09 FR FR591498D patent/FR591498A/en not_active Expired
- 1925-01-16 GB GB1398/25A patent/GB227858A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1698878A1 (en) * | 2005-03-04 | 2006-09-06 | Inficon GmbH | Electrode configuration and pressure measuring apparatus |
US7352187B2 (en) | 2005-03-04 | 2008-04-01 | Inficon Gmbh | Vacuum measuring gauge |
Also Published As
Publication number | Publication date |
---|---|
FR591498A (en) | 1925-07-04 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4075526A (en) | Hot-cathode x-ray tube having an end-mounted anode | |
US2177705A (en) | Electric lamp | |
US2164595A (en) | Method of coating electrodes | |
GB227858A (en) | Improvements relating to vacuum electric discharge devices | |
US3328622A (en) | Electric discharge device having primary and secondary electrodes | |
US3013175A (en) | High output discharge lamp | |
US2034571A (en) | Electrical discharge device and method of operating same | |
US2946910A (en) | Infrared image converter tubes | |
US1878338A (en) | Gaseous conduction apparatus | |
US2961566A (en) | Fluorescent lamp | |
US2236289A (en) | Thermionic device | |
US2164699A (en) | Electron discharge device | |
GB309442A (en) | Improvements in and relating to electron discharge devices | |
US2010852A (en) | Gaseous electric discharge device | |
US1211091A (en) | Cathode-ray device. | |
US2053501A (en) | Thermionic gaseous discharge rectifier | |
US1700373A (en) | Electron-discharge device | |
US2330848A (en) | Gaseous discharge device | |
US1648183A (en) | Method and apparatus for conducting current | |
US2112855A (en) | Electrode for discharge lamps | |
US1720172A (en) | Electron-discharge tube and method of manufacturing the same | |
US2636145A (en) | Gaseous discharge device | |
Vick et al. | Negative Ion Emission from Oxide-Coated Cathodes: I | |
US3198968A (en) | Thermoelectric conversion process and apparatus | |
GB421051A (en) | Cathode arrangement for braun tubes |