GB543920A - Improvements in cathodes for cathode ray tubes - Google Patents
Improvements in cathodes for cathode ray tubesInfo
- Publication number
- GB543920A GB543920A GB1703440A GB1703440A GB543920A GB 543920 A GB543920 A GB 543920A GB 1703440 A GB1703440 A GB 1703440A GB 1703440 A GB1703440 A GB 1703440A GB 543920 A GB543920 A GB 543920A
- Authority
- GB
- United Kingdom
- Prior art keywords
- spirals
- cathodes
- ray tubes
- box
- terminal support
- 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
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
- H01J29/48—Electron guns
- H01J29/484—Eliminating deleterious effects due to thermal effects, electrical or magnetic fields; Preventing unwanted emission
-
- 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
- H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
- H01J1/22—Heaters
Landscapes
- Solid Thermionic Cathode (AREA)
Abstract
543,920. Heating cathodes by electric resistances. BRITISH THOMSON-HOUSTON CO., Ltd., and RUSHFORTH, L. Nov. 29, 1940, No. 17034. [Class 39 (iii)] [Also in Group XL] Indirectly heated cathodes for cathode-ray tubes &c. comprise two flat spirals 1, 2, oppositely wound and connected in parallel to a source of heating current, for the purpose of avoiding magnetic field effects. The spirals are located, in a mass 5 of refractory insulating material in a box 4, one side 6 of which is dished and coated with electron emissive material. The other side is closed by a disc 7 provided with a hole through which the inner ends of the spirals pass to a terminal support 11. The outer ends of the spirals are connected together through the box and to a terminal support 10.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR950881D FR950881A (en) | 1940-11-29 | ||
| GB1703440A GB543920A (en) | 1940-11-29 | 1940-11-29 | Improvements in cathodes for cathode ray tubes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1703440A GB543920A (en) | 1940-11-29 | 1940-11-29 | Improvements in cathodes for cathode ray tubes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB543920A true GB543920A (en) | 1942-03-19 |
Family
ID=10088050
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1703440A Expired GB543920A (en) | 1940-11-29 | 1940-11-29 | Improvements in cathodes for cathode ray tubes |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR950881A (en) |
| GB (1) | GB543920A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2817451B2 (en) * | 1991-06-25 | 1998-10-30 | 日本電気株式会社 | Cathode for electron tube |
-
0
- FR FR950881D patent/FR950881A/fr not_active Expired
-
1940
- 1940-11-29 GB GB1703440A patent/GB543920A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR950881A (en) | 1949-10-10 |
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