GB1354860A - Colour picture tubes - Google Patents
Colour picture tubesInfo
- Publication number
- GB1354860A GB1354860A GB3021772A GB3021772A GB1354860A GB 1354860 A GB1354860 A GB 1354860A GB 3021772 A GB3021772 A GB 3021772A GB 3021772 A GB3021772 A GB 3021772A GB 1354860 A GB1354860 A GB 1354860A
- Authority
- GB
- United Kingdom
- Prior art keywords
- microns
- water glass
- coating
- graphite
- neck
- 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
- H01J31/20—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes for displaying images or patterns in two or more colours
- H01J31/201—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes for displaying images or patterns in two or more colours using a colour-selection electrode
-
- 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
- H01J29/86—Vessels; Containers; Vacuum locks
- H01J29/88—Vessels; Containers; Vacuum locks provided with coatings on the walls thereof; Selection of materials for the coatings
Landscapes
- Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
- Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
Abstract
1354860 Colour television tubes HITACHI Ltd 28 June 1972 [5 July 1971 9 Aug 1971] 30217/72 Heading H1D The cone of a colour television tube is coated internally with a conductive layer of low secondary electron emissivity, because secondary electrons degrade the colour purity. In one example a film of water glass 2-10 microns thick is applied to the surface and covered with a layer 5-30 microns thick of graphite powder having a grain size of 0À5-1 microns. In other examples a mixture of water glass with titanium hydride or with graphite particles is applied to a thickness of 2-30 microns; in each case the secondary emission ratio is less than 0À25. If the coating has sufficient mechanical strength (e.g. the mixture of graphite and water glass) it may extend into the neck to make contact with connections attached to the electron gun; alternatively a coating of higher mechanical strength and a thickness of 7-40 microns may be applied to the neck and funnel, and a further coating as described above is applied over the funnel portion. The tube may be of the shadow mask type and may employ post-deflection focusing.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4883571 | 1971-07-05 | ||
| JP7041871U JPS4827754U (en) | 1971-08-09 | 1971-08-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1354860A true GB1354860A (en) | 1974-06-05 |
Family
ID=26389160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3021772A Expired GB1354860A (en) | 1971-07-05 | 1972-06-28 | Colour picture tubes |
Country Status (4)
| Country | Link |
|---|---|
| CA (1) | CA972026A (en) |
| DE (1) | DE2232798A1 (en) |
| FR (1) | FR2144768B1 (en) |
| GB (1) | GB1354860A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4188564A (en) * | 1976-12-13 | 1980-02-12 | U.S. Philips Corporation | Cathode ray tube having low resistance contact area beneath high voltage contact spring |
-
1972
- 1972-06-27 CA CA145,819A patent/CA972026A/en not_active Expired
- 1972-06-28 GB GB3021772A patent/GB1354860A/en not_active Expired
- 1972-07-04 DE DE19722232798 patent/DE2232798A1/en active Pending
- 1972-07-04 FR FR7224168A patent/FR2144768B1/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR2144768A1 (en) | 1973-02-16 |
| DE2232798A1 (en) | 1973-01-25 |
| FR2144768B1 (en) | 1976-03-12 |
| CA972026A (en) | 1975-07-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| 435 | Patent endorsed 'licences of right' on the date specified (sect. 35/1949) | ||
| PCNP | Patent ceased through non-payment of renewal fee |