GB490652A - Improvements in or relating to electric discharge tubes - Google Patents
Improvements in or relating to electric discharge tubesInfo
- Publication number
- GB490652A GB490652A GB10819/38A GB1081938A GB490652A GB 490652 A GB490652 A GB 490652A GB 10819/38 A GB10819/38 A GB 10819/38A GB 1081938 A GB1081938 A GB 1081938A GB 490652 A GB490652 A GB 490652A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cathode
- june
- mixture
- per cent
- emissive material
- 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
- H01J43/00—Secondary-emission tubes; Electron-multiplier tubes
- H01J43/02—Tubes in which one or a few electrodes are secondary-electron emitting electrodes
-
- 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
Landscapes
- Discharge Lamp (AREA)
- Electron Sources, Ion Sources (AREA)
Abstract
490,652. Electron multipliers. NAAMLOOZE VENNOOTSCHAP PHILIPS'GLOEILAMPENFABRIEKEN. June 19, 1937, No. 10819/38. Convention date, June 22, 1936. Divided application. [Class 39 (i)] A discharge tube containing a thermionic cathode, one or more grids, an anode and a secondary emission electrode is so designed that the maximum temperature of the cathode during operation is not more than 700‹ C., whereby vaporization of the cathode is reduced to such an extent as to prevent deleterious action of vaporized material such as barium on the secondary emission electrode. The temperature of such a cathode may be rendered more uniform by utilizing a thick cathode surface, by giving it a smaller diameter at the ends, or by winding the heater with a variable pitch. The cathode may be of copper or copper alloy. Emissive material may be removed from those parts of the cathode which do not participate in emission, for example those opposite the grid supports. The emissive material may be a mixture of low volatility, for example, a mixture of 20 per cent barium oxide and 80 per cent strontium oxide.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL78256A NL51881C (en) | 1936-06-22 | 1936-06-22 | Electron tube, provided with a secondary emission electrode |
| GB1715137A GB497589A (en) | 1936-06-22 | 1937-06-19 | Improvements in or relating to electric discharge tubes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB490652A true GB490652A (en) | 1938-08-18 |
Family
ID=19786677
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1715137A Expired GB497589A (en) | 1936-06-22 | 1937-06-19 | Improvements in or relating to electric discharge tubes |
| GB10819/38A Expired GB490652A (en) | 1936-06-22 | 1937-06-19 | Improvements in or relating to electric discharge tubes |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1715137A Expired GB497589A (en) | 1936-06-22 | 1937-06-19 | Improvements in or relating to electric discharge tubes |
Country Status (5)
| Country | Link |
|---|---|
| BE (1) | BE422206A (en) |
| FR (1) | FR823346A (en) |
| GB (2) | GB497589A (en) |
| NL (1) | NL51881C (en) |
| SE (1) | SE102953C1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE874176C (en) * | 1939-03-25 | 1953-04-20 | Sueddeutsche Telefon App | Secondary electron multiplier with glow cathode |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE757225C (en) * | 1938-08-30 | 1952-11-17 | Lorenz C Ag | Secondary electron multiplier with several impact electrodes arranged one behind the other and concentric to the primary electron source designed as a glow cathode |
| BE864567A (en) * | 1977-04-25 | 1978-07-03 | Chevron Res | PROCESS FOR HYDROGENATION OF ESTERS INTO ACOOLS |
-
1936
- 1936-06-22 NL NL78256A patent/NL51881C/en active
-
1937
- 1937-06-19 GB GB1715137A patent/GB497589A/en not_active Expired
- 1937-06-19 GB GB10819/38A patent/GB490652A/en not_active Expired
- 1937-06-19 SE SE302937A patent/SE102953C1/en unknown
- 1937-06-21 BE BE422206A patent/BE422206A/xx unknown
- 1937-06-21 FR FR823346D patent/FR823346A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE874176C (en) * | 1939-03-25 | 1953-04-20 | Sueddeutsche Telefon App | Secondary electron multiplier with glow cathode |
Also Published As
| Publication number | Publication date |
|---|---|
| FR823346A (en) | 1938-01-18 |
| SE102953C1 (en) | 1941-11-04 |
| BE422206A (en) | 1937-07-31 |
| NL51881C (en) | 1942-02-16 |
| GB497589A (en) | 1938-12-19 |
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