GB474834A - Improvements in or relating to electron discharge devices - Google Patents
Improvements in or relating to electron discharge devicesInfo
- Publication number
- GB474834A GB474834A GB1330136A GB1330136A GB474834A GB 474834 A GB474834 A GB 474834A GB 1330136 A GB1330136 A GB 1330136A GB 1330136 A GB1330136 A GB 1330136A GB 474834 A GB474834 A GB 474834A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electrode
- hydride
- metal
- hydrogen
- vacuo
- 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
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/02—Manufacture of electrodes or electrode systems
- H01J9/12—Manufacture of electrodes or electrode systems of photo-emissive cathodes; of secondary-emission electrodes
- H01J9/125—Manufacture of electrodes or electrode systems of photo-emissive cathodes; of secondary-emission electrodes of secondary emission electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2201/00—Electrodes common to discharge tubes
- H01J2201/32—Secondary emission electrodes
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
Abstract
474,834. Electrode materials. BAIRD TELEVISION, Ltd., and KING, E. B. May 11, 1936, No. 13301. [Class 39 (i)] A secondary electron-emitting surface of a metallic hydride is produced on an electrode by enclosing the electrode in an envelope and admitting hydrogen to form the required hydride. Metals of the second and third groups of the periodic table may be used. Metal electrodes may be degassed in vacuo and treated with hydrogen, the formation of hydride being produced by heat or by an electric discharge between the electrode and another electrode within the envelope. The metal of the hydride, for example, potassium or caesium, may be evaporated in vacuo or, for example, in the case of copper, it may be sputtered on to an electrode of another metal, and the thickness of the layer of hydride may be regulated by controlling the temperature or stopping the discharge current. The electrode may be treated with hydrogen in the discharge tube itself or in a separate vessel. The Provisional Specification refers to the formation of secondary electron-emitting surfaces by covering electrodes consisting in the main of metal or other substances with thin layers of non- metallic substances in general.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1330136A GB474834A (en) | 1936-05-11 | 1936-05-11 | Improvements in or relating to electron discharge devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1330136A GB474834A (en) | 1936-05-11 | 1936-05-11 | Improvements in or relating to electron discharge devices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB474834A true GB474834A (en) | 1937-11-09 |
Family
ID=10020458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1330136A Expired GB474834A (en) | 1936-05-11 | 1936-05-11 | Improvements in or relating to electron discharge devices |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB474834A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE895629C (en) * | 1940-07-31 | 1953-11-05 | Zeiss Ikon Ag | Process for the manufacture of secondary emission cathodes |
-
1936
- 1936-05-11 GB GB1330136A patent/GB474834A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE895629C (en) * | 1940-07-31 | 1953-11-05 | Zeiss Ikon Ag | Process for the manufacture of secondary emission cathodes |
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