GB421050A - Improvements in or relating to cathode ray tubes - Google Patents
Improvements in or relating to cathode ray tubesInfo
- Publication number
- GB421050A GB421050A GB13842/33A GB1384233A GB421050A GB 421050 A GB421050 A GB 421050A GB 13842/33 A GB13842/33 A GB 13842/33A GB 1384233 A GB1384233 A GB 1384233A GB 421050 A GB421050 A GB 421050A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cathode
- anode
- electrode
- concentrating
- electrons
- 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
- H01J29/58—Arrangements for focusing or reflecting ray or beam
- H01J29/62—Electrostatic lenses
- H01J29/622—Electrostatic lenses producing fields exhibiting symmetry of revolution
- H01J29/624—Electrostatic lenses producing fields exhibiting symmetry of revolution co-operating with or closely associated to an electron gun
Landscapes
- Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
- Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
Abstract
421,050. Cathode-ray tubes. RADIOAKT.-GES. D. S. LOEWE, 10, Wiesenweg, Steglitz, and SCHLESINGER, K., 39, Friedrichstrasse, Friedrichshagen, both in Berlin. May 12, 1933, Nos. 13842 and 13843. Convention dates, May 14, 1932 and July 15, 1932. [Class 39 (i)] In a cathode - ray tube of the gas-filled or high-vacuum type and with a cathode, an anode, a fluorescent screen and deflecting devices for scanning the screen, a non-uniform electrostatic field concentrating the electrons between the cathode and the screen is produced by an electrode spaced from the wall of the tube and of semiconductive material with a potential difference applied across its extremities. A semi-conductive coating on the side of an apertured mica disc 1, Fig. 2, facing the anode 7 may be connected at its inner circumference to the preliminary anode 11 and at its outer circumference to a more negative variable potential to produce between the disc 1 and the anode 7 an inwardly directed field of intensity increasing away from the axis of the tube. The coating on the disc 1 may be non-uniform. Metal screens 6, 8 have the same potential as the anode 11. Further concentrating means may be provided. A Wehnelt cylinder 9 may concentrate and control the electrons leaving the cathode 10. In a modification, Fig. 3, the concentrating electrode 15 between the cathode 10 and anode 7 is tubular with apertured end plates and is of diameter decreasing along its axis in the direction of motion of the electrons. A converging accelerating field is produced inside the electrode 15 by applying a potential difference across the semi-conductive material on its surface. The concentrating electrode may be a carbon coating on insulating material or a mass of aluminium or other insulating oxide mixed with carbon.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE421050X | 1932-05-14 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB421050A true GB421050A (en) | 1934-12-12 |
Family
ID=6455496
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB13842/33A Expired GB421050A (en) | 1932-05-14 | 1933-05-12 | Improvements in or relating to cathode ray tubes |
Country Status (4)
Country | Link |
---|---|
US (1) | US2003775A (en) |
FR (1) | FR755580A (en) |
GB (1) | GB421050A (en) |
NL (1) | NL41683C (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2430482A (en) * | 1942-02-12 | 1947-11-11 | Raytheon Mfg Co | Gaseous electric lamp |
US2438709A (en) * | 1942-08-06 | 1948-03-30 | Hartford Nat Bank & Trust Co | Thermionic tube having secondary electron emissive electrode with surface and form variations |
FR961000A (en) * | 1945-09-22 | 1950-04-28 | ||
US3355618A (en) * | 1965-10-21 | 1967-11-28 | Rca Corp | Electron gun for use in a cathode ray tube exhibiting enhanced electron emission |
-
0
- NL NL41683D patent/NL41683C/xx active
-
1933
- 1933-05-12 GB GB13842/33A patent/GB421050A/en not_active Expired
- 1933-05-13 FR FR755580D patent/FR755580A/en not_active Expired
- 1933-05-13 US US670819A patent/US2003775A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
FR755580A (en) | 1933-11-27 |
NL41683C (en) | |
US2003775A (en) | 1935-06-04 |
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