GB658287A - Improvements in or relating to cathode ray tubes - Google Patents
Improvements in or relating to cathode ray tubesInfo
- Publication number
- GB658287A GB658287A GB2089648A GB2089648A GB658287A GB 658287 A GB658287 A GB 658287A GB 2089648 A GB2089648 A GB 2089648A GB 2089648 A GB2089648 A GB 2089648A GB 658287 A GB658287 A GB 658287A
- Authority
- GB
- United Kingdom
- Prior art keywords
- grid
- electrode
- cathode
- anode
- inches
- 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
- Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
Abstract
658,287. Cathode-ray tubes. ELECTRIC & MUSICAL INDUSTRIES, Ltd. Aug. 7, 1948, No. 20896. [Class 39 (i)] A cathode-ray tube comprises a cathode 2, grid 6, apertured electrode 7 and anode 9, the voltage required to produce a variation of beam current being reduced by arranging the grid 6 at a distance from the electrode 7, which is between <SP>3</SP>/ 2 and <SP>3</SP>/ 4 of the diameter of the aperture therein. The lens formed thereby produces a waist in the beam between the grid and anode. In the preferred form, a television receiving tube has a flat or concave grid 6 of 200 apertures per inch and radius of 3 mms., and is secured to a disc 4 which is 0.008 inches thick; it is arranged so that its apex is 0.003-0.006 inches from the emissive surface 2 and 0.030-0.015 inches from the electrode 7. The thickness of electrode 7 may be 0.01 ins. and the anode potential 6 k.v. The grid may be earthed and connected to, or be positively biassed 5 volts with respect to, the electrode 7. A modulating potential of 3 volts between cathode and grid will cause a variation of beam current of 200 m.a.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2089648A GB658287A (en) | 1948-08-07 | 1948-08-07 | Improvements in or relating to cathode ray tubes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2089648A GB658287A (en) | 1948-08-07 | 1948-08-07 | Improvements in or relating to cathode ray tubes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB658287A true GB658287A (en) | 1951-10-03 |
Family
ID=10153603
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2089648A Expired GB658287A (en) | 1948-08-07 | 1948-08-07 | Improvements in or relating to cathode ray tubes |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB658287A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1005200B (en) * | 1953-03-09 | 1957-03-28 | Loewe Opta Ag | Electrode pre-system for electron beam tubes, especially television picture tubes |
-
1948
- 1948-08-07 GB GB2089648A patent/GB658287A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1005200B (en) * | 1953-03-09 | 1957-03-28 | Loewe Opta Ag | Electrode pre-system for electron beam tubes, especially television picture tubes |
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