GB680402A - Improvements in or relating to cathode ray tubes or the like - Google Patents
Improvements in or relating to cathode ray tubes or the likeInfo
- Publication number
- GB680402A GB680402A GB316/51A GB31651A GB680402A GB 680402 A GB680402 A GB 680402A GB 316/51 A GB316/51 A GB 316/51A GB 31651 A GB31651 A GB 31651A GB 680402 A GB680402 A GB 680402A
- Authority
- GB
- United Kingdom
- Prior art keywords
- gun
- mesh
- layer
- volts
- fluorescent screen
- 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
- H01J31/00—Cathode ray tubes; Electron beam tubes
- H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
- H01J31/10—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes
- H01J31/12—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes with luminescent screen
Landscapes
- Analysing Materials By The Use Of Radiation (AREA)
Abstract
680,402. Cathode ray tubes. COMPAGNIE POUR LA FABRICATION DES COMPTEURS ET MATERIEL D'USINES A GAZ. Jan 4,1951 [Jan. 4, 1950], No. 316/51. Class 39(i) A cathode ray storage tube comprises a fluorescent screen, a foraminated control electrode positioned in close proximity to the fluorescent screen, means producing a virtual cathode adjacent to the control electrode, scanning means producing a charge pattern on the control electrode which controls the transference of electrons from the virtual cathode to the fluorescent screen and means for erasing the charge pattern. The foraminated control electrode may be a metallic mesh covered with a thin insulating film 1-2 microns thick. In Fig. 2 the fluorescent layer F is covered with a layer of aluminium 2 which is connected via metal layer 3 to an external electrode 4 at 10,000 volts. The mesh G is located a few millimetres from the screen F, and is given a potential of 1000 volts. An accelerator mesh 6 at 2000 volts is provided one millimetre from mesh G on the gun side, and is connected to a graphite layer 8 on the tube wall. There are three electron guns S, M, E. Gun S which is at 1000 volts, is spherical and concave and produces a wide flooding beam, the electrons from which are retarded between grids 6 and G to form a virtual cathode, Gun M at earth potential is modulated by the video signal and scans the mesh G, the secondary emission of the insulating layer producing a potential pattern on the grid. The gun E is at 10,000 volts negative and scans just in advance of gun M to erase the previous pattern. The gun E may be omitted and the layer on the mesh G must then have such slight conductivity as to allow discharge during the complete image period. Alternatively the material of the insulating layer may be photo-conductive and erasure obtained by uniform illumination of the control grid through a window in the side of the tube. The tube is applicable for producing television, radar or oscillograph images. The trace of the latter may persist for several seconds to allow visual observation or photographic recording. The fluorescent screen may be of layers, which produces ultra-violet radiation. The fluorescent layer may be cooled by a current of cold water. In large screen projection using a Schmidt optical system the shape of the fluorescent screen conforms with a portion of the surface of a sphere and the meshes G and 6 are concentric therewith. The modulation of the controlling beam may be obtained by the occulting action of a small aperture across which the beam is deflected.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1007587T | 1950-01-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB680402A true GB680402A (en) | 1952-10-01 |
Family
ID=9566666
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB316/51A Expired GB680402A (en) | 1950-01-04 | 1951-01-04 | Improvements in or relating to cathode ray tubes or the like |
Country Status (2)
Country | Link |
---|---|
FR (1) | FR1007587A (en) |
GB (1) | GB680402A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2873398A (en) * | 1956-01-04 | 1959-02-10 | Munsey E Crost | Direct viewing moving target indicator cathode-ray storage tube |
-
1950
- 1950-01-04 FR FR1007587D patent/FR1007587A/en not_active Expired
-
1951
- 1951-01-04 GB GB316/51A patent/GB680402A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR1007587A (en) | 1952-05-07 |
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