GB518588A - Improvements in or relating to screens for cathode ray tubes - Google Patents
Improvements in or relating to screens for cathode ray tubesInfo
- Publication number
- GB518588A GB518588A GB25460/38A GB2546038A GB518588A GB 518588 A GB518588 A GB 518588A GB 25460/38 A GB25460/38 A GB 25460/38A GB 2546038 A GB2546038 A GB 2546038A GB 518588 A GB518588 A GB 518588A
- Authority
- GB
- United Kingdom
- Prior art keywords
- screen
- ray tubes
- nitrate
- oxide
- cathode
- 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
- 229910002651 NO3 Inorganic materials 0.000 abstract 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 abstract 2
- 238000010438 heat treatment Methods 0.000 abstract 2
- 239000010445 mica Substances 0.000 abstract 2
- 229910052618 mica group Inorganic materials 0.000 abstract 2
- 238000005507 spraying Methods 0.000 abstract 2
- ZSLUVFAKFWKJRC-IGMARMGPSA-N 232Th Chemical compound [232Th] ZSLUVFAKFWKJRC-IGMARMGPSA-N 0.000 abstract 1
- 229910011255 B2O3 Inorganic materials 0.000 abstract 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 abstract 1
- 229910052684 Cerium Inorganic materials 0.000 abstract 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 abstract 1
- 229910052776 Thorium Inorganic materials 0.000 abstract 1
- 230000001464 adherent effect Effects 0.000 abstract 1
- 229910052791 calcium Inorganic materials 0.000 abstract 1
- 239000011575 calcium Substances 0.000 abstract 1
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 abstract 1
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 abstract 1
- 238000007598 dipping method Methods 0.000 abstract 1
- 230000004907 flux Effects 0.000 abstract 1
- 229910052748 manganese Inorganic materials 0.000 abstract 1
- 239000011572 manganese Substances 0.000 abstract 1
- 150000002823 nitrates Chemical class 0.000 abstract 1
- 238000010422 painting Methods 0.000 abstract 1
- VGBPIHVLVSGJGR-UHFFFAOYSA-N thorium(4+);tetranitrate Chemical compound [Th+4].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VGBPIHVLVSGJGR-UHFFFAOYSA-N 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- H01J29/02—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
- Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
- Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
Abstract
518,588. Cathode-ray tubes. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Aug. 31, 1938, No. 25460. Convention date, Aug. 31, 1937. [Class 39 (i)] An incandescent screen for use in cathode-ray tubes consists of a wire mesh 10 in the interstices of which are mounted independent rodlets 11 of refractory oxide ; these may have refractory caps 12. They may be made from the nitrates of thorium, cerium, calcium or manganese which on reduction by heat produce the oxide ; preferably thorium nitrate in water is used with boric oxide as a flux, this solution being applied to the wire mesh by painting, dipping or spraying. When sufficient nitrate is adherent the mass is heated by applying a current to the mesh which is temporarily attached to end electrodes 14, Fig. 7 ; to ensure heating of the edge of the screen, non-coated wires 15 are placed alongside and current also passed therethrough. The caps 12 are formed by spraying on nitrate solution after the main parts of the rodlets have been formed and subsequent heating. The screen so formed is mounted in a frame 18 with a mica backing 19, and mica heat insulating strips 20. The image produced on the screen can be projected by a lens on a viewing screen.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US161732A US2160022A (en) | 1937-08-31 | 1937-08-31 | Screen for cathode ray tubes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB518588A true GB518588A (en) | 1940-03-01 |
Family
ID=22582475
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB25460/38A Expired GB518588A (en) | 1937-08-31 | 1938-08-31 | Improvements in or relating to screens for cathode ray tubes |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2160022A (en) |
| GB (1) | GB518588A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2473220A (en) * | 1941-08-16 | 1949-06-14 | Rca Corp | Method of manufacturing target electrodes |
| US2548405A (en) * | 1945-07-24 | 1951-04-10 | Rca Corp | Electron tube |
| US2690519A (en) * | 1952-09-17 | 1954-09-28 | Farnsworth Res Corp | Incandescent screen for projection tubes |
-
1937
- 1937-08-31 US US161732A patent/US2160022A/en not_active Expired - Lifetime
-
1938
- 1938-08-31 GB GB25460/38A patent/GB518588A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US2160022A (en) | 1939-05-30 |
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