GB469418A - Improvements in or relating to cathode ray tubes - Google Patents
Improvements in or relating to cathode ray tubesInfo
- Publication number
- GB469418A GB469418A GB2353/36A GB235336A GB469418A GB 469418 A GB469418 A GB 469418A GB 2353/36 A GB2353/36 A GB 2353/36A GB 235336 A GB235336 A GB 235336A GB 469418 A GB469418 A GB 469418A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electrode
- cathode
- area
- ray tubes
- surrounded
- 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
- 239000002184 metal Substances 0.000 abstract 3
- 239000010445 mica Substances 0.000 abstract 2
- 229910052618 mica group Inorganic materials 0.000 abstract 2
- 238000010894 electron beam technology Methods 0.000 abstract 1
- 239000011521 glass Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
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
- H01J29/488—Schematic arrangements of the electrodes for beam forming; Place and form of the elecrodes
Landscapes
- Electrodes For Cathode-Ray Tubes (AREA)
- Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
Abstract
469,418. Cathode-ray tubes. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., and BRETT, G. F. Jan. 24, 1936, No. 2353. [Class 39 (i)] Small, gas-focused, cathode-ray tubes operating at low voltages and applicable as indicating-instruments in radio direction-finders &c. comprise a cathode 3 with small, circular, emissive area 3a and three transverse, circularly apertured electrodes 5 .. 7 ; the electrode 5 is in or as close as possible to the plane of the area 3a and surrounds this area, the electrode 6 has an aperture of about À75 rnm. diameter and is 1-1À75 mm. in front of the area 3a, and the electrode 7 is close to the electrode 6 and has a much larger aperture than those in the other electrodes. The electrode 5 is connected to the cathode 3 or to one leg of the cathode heater, the electrode 6 is at a low positive potential varied for focusing control and the electrode 7 is connected inside or outside the tube to the metal plate of the fluorescent screen 8 and is at the full anode potential. The electron beam may be deflected magnetically, or electrostatically by plates 10, 11 which may be surrounded by a cylindrical metal sheath. The leads to the plates 10, 11 may be surrounded by glass sleeves. The electrode 7, separated by mica 12 from the electrode 6, may have a cylindrical extension 7b ending in an apertured disc 7c. In modifications, the fluorescent material is deposited on a semi-transparent metal layer on the end wall of the tube or a metallized fluorescent screen on a mica backing is used. Voltages and dimensions are specified.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US2172530D US2172530A (en) | 1936-01-24 | Cathode bay tube | |
| GB2353/36A GB469418A (en) | 1936-01-24 | 1936-01-24 | Improvements in or relating to cathode ray tubes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2353/36A GB469418A (en) | 1936-01-24 | 1936-01-24 | Improvements in or relating to cathode ray tubes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB469418A true GB469418A (en) | 1937-07-26 |
Family
ID=9738060
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2353/36A Expired GB469418A (en) | 1936-01-24 | 1936-01-24 | Improvements in or relating to cathode ray tubes |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2172530A (en) |
| GB (1) | GB469418A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2201536A1 (en) * | 1972-09-26 | 1974-04-26 | Thomson Csf | |
| EP0040126A1 (en) * | 1980-05-14 | 1981-11-18 | Thomson-Csf | Electron gun for a converging beam |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2755413A (en) * | 1951-02-23 | 1956-07-17 | Edgar R Wagner | Gas filled projector tubes for television |
| US2907918A (en) * | 1956-07-16 | 1959-10-06 | Edgar R Wagner | Television picture tubes |
| JPS5222227B2 (en) * | 1972-05-08 | 1977-06-16 |
-
0
- US US2172530D patent/US2172530A/en not_active Expired - Lifetime
-
1936
- 1936-01-24 GB GB2353/36A patent/GB469418A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2201536A1 (en) * | 1972-09-26 | 1974-04-26 | Thomson Csf | |
| EP0040126A1 (en) * | 1980-05-14 | 1981-11-18 | Thomson-Csf | Electron gun for a converging beam |
| FR2482778A1 (en) * | 1980-05-14 | 1981-11-20 | Thomson Csf | ELECTRON BARRIER FOR CONVERGENT BEAM, AND DEVICE, VIDICON TUBE IN PARTICULAR, PROVIDED WITH SUCH A CANON |
| US4486687A (en) * | 1980-05-14 | 1984-12-04 | Thomson-Csf | Electron gun for convergent beam, and a device, particularly a vidicon tube, equipped with such a gun |
Also Published As
| Publication number | Publication date |
|---|---|
| US2172530A (en) | 1939-09-12 |
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