GB420067A - Improvements in braun tubes, more particularly for television purposes - Google Patents
Improvements in braun tubes, more particularly for television purposesInfo
- Publication number
- GB420067A GB420067A GB5470/33A GB547033A GB420067A GB 420067 A GB420067 A GB 420067A GB 5470/33 A GB5470/33 A GB 5470/33A GB 547033 A GB547033 A GB 547033A GB 420067 A GB420067 A GB 420067A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cathode
- electrode
- electrodes
- cylinder
- feb
- 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
- H01J29/52—Arrangements for controlling intensity of ray or beam, e.g. for modulation
Landscapes
- Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
Abstract
420,067. Cathode-ray tubes. HUDEC, E., 17, Potsdamerstrasse, Sudende, Berlin. Feb. 22, 1933, No. 5470. Convention date, Feb. 23, 1932. [Class 39 (i)] The brightness of the fluorescent spot of a Braun tube for television &c. is modulated by an electrostatic field which controls the number oi electrons leaving the cathode and which, in front of the cathode in the direction of the anode, is parallel to the axis of the beam, the beam being then concentrated by a second electrostatic field converging from a positive electrode As to a more positive electrode Ak. The controlling field is formed between the cathode K, the Wehnelt cylinder W and the electrode As, the cathode projecting through a disc inside the cylinder W and the modulating voltages being applied to the cylinder W or to the electrode As. The electrode As is conically or spherically concave on the side facing the electrode Ak. The cathode may be an annular filament. The potential difference between the electrodes K, As is one-tenth that between the electrodes K, Ak. The potentials of the electrodes W and As are adjusted independently of the potential of the electrode Ak. Specification 271,131, [Class 39 (i)], is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE420067X | 1932-02-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB420067A true GB420067A (en) | 1934-11-22 |
Family
ID=6449445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5470/33A Expired GB420067A (en) | 1932-02-23 | 1933-02-22 | Improvements in braun tubes, more particularly for television purposes |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR753459A (en) |
| GB (1) | GB420067A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3179844A (en) * | 1958-11-25 | 1965-04-20 | Harries Electronics Corp Ltd | Electron gun having tapered emitting cathode surface |
-
1933
- 1933-02-22 GB GB5470/33A patent/GB420067A/en not_active Expired
- 1933-02-23 FR FR753459D patent/FR753459A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3179844A (en) * | 1958-11-25 | 1965-04-20 | Harries Electronics Corp Ltd | Electron gun having tapered emitting cathode surface |
Also Published As
| Publication number | Publication date |
|---|---|
| FR753459A (en) | 1933-10-17 |
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