GB445316A - Improvements in screens for cathode ray apparatus - Google Patents
Improvements in screens for cathode ray apparatusInfo
- Publication number
- GB445316A GB445316A GB497435A GB497435A GB445316A GB 445316 A GB445316 A GB 445316A GB 497435 A GB497435 A GB 497435A GB 497435 A GB497435 A GB 497435A GB 445316 A GB445316 A GB 445316A
- Authority
- GB
- United Kingdom
- Prior art keywords
- fabric
- salts
- per cent
- cathode
- oxides
- 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
- H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
- H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
- H01J29/16—Incandescent screens
Landscapes
- Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
Abstract
445,316. Cathode-ray tubes. TURNER, F. S., 2576, Green Street, San Francisco, U.S.A. Feb. 15, 1935, No. 4974. [Class 39 (i)] Luminescent screens of cathode-ray apparatus for oscillography or television consist of fabrics of refractory oxides raised to incandescence by the local electron bombardment A fabric 20, Fig. 2, is impregnated with salts of metals such as thorium, uranium; cerium, calcium, magnesium or zirconium and is burnt off to remove the material of the fabric and to convert the salts to oxides. The salts used are nitrates, and 99 per cent of thorium may be used with 1 per cent of uranium with or without an addition of aluminium or beryllium salt up to 0À5 per cent. Pure thoria and gas mantle mixtures of thoria and ceria are also referred to. The fabric is mounted with its pile 21 facing the cathode ray or a pileless fabric may be used. The fabric may be mounted in a ring 17, Fig. 1, on longitudinal struts 10 which are of curved cross-section and which carry the anode 7 with conical projection 6. The electron beam is modulated by a grid 15, focused by a coaxial coil 22 and deflected to scan the fabric 20 by coils 24. Electron beams of 10 milliamps. raise the fabric rapidly to local incandescence which fades slowly as heat is radiated slowly by the oxides. The intense image produced is not viewed directly but is projected on an enlarged scale on to a viewing screen.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB497435A GB445316A (en) | 1935-02-15 | 1935-02-15 | Improvements in screens for cathode ray apparatus |
| FR796715D FR796715A (en) | 1935-02-15 | 1935-10-23 | cathode ray tube screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB497435A GB445316A (en) | 1935-02-15 | 1935-02-15 | Improvements in screens for cathode ray apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB445316A true GB445316A (en) | 1936-04-07 |
Family
ID=9787377
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB497435A Expired GB445316A (en) | 1935-02-15 | 1935-02-15 | Improvements in screens for cathode ray apparatus |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR796715A (en) |
| GB (1) | GB445316A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB481434A (en) * | 1936-08-10 | 1938-03-10 | Marconi Wireless Telegraph Co | Improvements in or relating to television and like reproducers |
-
1935
- 1935-02-15 GB GB497435A patent/GB445316A/en not_active Expired
- 1935-10-23 FR FR796715D patent/FR796715A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR796715A (en) | 1936-04-14 |
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