GB607149A - Improvements in and relating to electron discharge tubes - Google Patents
Improvements in and relating to electron discharge tubesInfo
- Publication number
- GB607149A GB607149A GB2666/46A GB266646A GB607149A GB 607149 A GB607149 A GB 607149A GB 2666/46 A GB2666/46 A GB 2666/46A GB 266646 A GB266646 A GB 266646A GB 607149 A GB607149 A GB 607149A
- Authority
- GB
- United Kingdom
- Prior art keywords
- silver
- oxygen
- magnesium
- pretreatment
- microns
- 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
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract 3
- 229910052760 oxygen Inorganic materials 0.000 abstract 3
- 239000001301 oxygen Substances 0.000 abstract 3
- 238000010438 heat treatment Methods 0.000 abstract 2
- SJCKRGFTWFGHGZ-UHFFFAOYSA-N magnesium silver Chemical compound [Mg].[Ag] SJCKRGFTWFGHGZ-UHFFFAOYSA-N 0.000 abstract 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 abstract 1
- 229910000861 Mg alloy Inorganic materials 0.000 abstract 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 abstract 1
- 229910045601 alloy Inorganic materials 0.000 abstract 1
- 239000000956 alloy Substances 0.000 abstract 1
- 239000011521 glass Substances 0.000 abstract 1
- 229910052749 magnesium Inorganic materials 0.000 abstract 1
- 239000011777 magnesium Substances 0.000 abstract 1
- 229910052751 metal Inorganic materials 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 230000001590 oxidative effect Effects 0.000 abstract 1
- 229910052709 silver Inorganic materials 0.000 abstract 1
- 239000004332 silver Substances 0.000 abstract 1
- 239000010409 thin film Substances 0.000 abstract 1
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)
- Discharge Lamp (AREA)
- Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
Abstract
A secondary emissive electrode comprising a body of silver-magnesium alloy in which silver predominates is subjected to a pretreatment by superficially oxidizing it until it exhibits a golden to bluish interference colour before introducing it into the envelope of an electron discharge tube. The alloy may contain 20 per cent magnesium. In the pretreatment, the silver-magnesium body is placed in a metal holder inside a hard glass heating tube which is then evacuated. A little oxygen is then introduced and the body heated slightly to form a thin film on the surface thereof; the oxygen is then pumped out and the body baked in vacuo. Oxygen is then again introduced at a pressure of 10-2,000 microns, preferably 50-150 microns, and the body is heated for 40-50 mins. by a high frequency coil to 500-700 DEG C., preferably 600-700 DEG C. The heating tube is then cooled to room temperature and the pretreated body removed. Specification 526,731 is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US574917A US2393803A (en) | 1945-01-27 | 1945-01-27 | Method of making long life secondary electron emitters |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB607149A true GB607149A (en) | 1948-08-26 |
Family
ID=24298172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2666/46A Expired GB607149A (en) | 1945-01-27 | 1946-01-28 | Improvements in and relating to electron discharge tubes |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2393803A (en) |
| GB (1) | GB607149A (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2563482A (en) * | 1951-08-07 | Beam deflection tube with second | ||
| FR862488A (en) * | 1939-08-29 | 1941-03-07 | Materiel Telephonique | electronically emitting electrodes |
| NL59460C (en) * | 1943-02-15 | |||
| US2559524A (en) * | 1948-10-20 | 1951-07-03 | Rca Corp | Electron discharge device of the beam deflection type |
| US2553735A (en) * | 1950-01-21 | 1951-05-22 | Zenith Radio Corp | Push-pull output tube |
| US2622218A (en) * | 1950-01-31 | 1952-12-16 | Rca Corp | Secondary-emission electron discharge device |
| US2640169A (en) * | 1950-06-19 | 1953-05-26 | Farnsworth Res Corp | Heated cathode electron multiplier |
| US2754375A (en) * | 1950-07-13 | 1956-07-10 | Hartford Nat Bank & Trust Co | Device comprising an electric discharge tube of the electron-beam type |
| US2781474A (en) * | 1951-07-16 | 1957-02-12 | Radiation Res Corp | Beam deflection electrometer amplifier tubes |
| BE519545A (en) * | 1952-05-01 | |||
| US2878093A (en) * | 1955-02-14 | 1959-03-17 | Univ Minnesota | Method of preparing emitter surfaces |
| CN113471034B (en) * | 2021-05-29 | 2023-11-14 | 南京三乐集团有限公司 | Preparation method of magnesium oxide secondary emitter |
-
1945
- 1945-01-27 US US574917A patent/US2393803A/en not_active Expired - Lifetime
-
1946
- 1946-01-28 GB GB2666/46A patent/GB607149A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US2393803A (en) | 1946-01-29 |
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