GB768747A - Improvements in or relating to devices for reproducing coloured television images - Google Patents
Improvements in or relating to devices for reproducing coloured television imagesInfo
- Publication number
- GB768747A GB768747A GB35679/54A GB3567954A GB768747A GB 768747 A GB768747 A GB 768747A GB 35679/54 A GB35679/54 A GB 35679/54A GB 3567954 A GB3567954 A GB 3567954A GB 768747 A GB768747 A GB 768747A
- Authority
- GB
- United Kingdom
- Prior art keywords
- grid
- colour
- potential
- grids
- selection
- 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
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/16—Picture reproducers using cathode ray tubes
- H04N9/22—Picture reproducers using cathode ray tubes using the same beam for more than one primary colour information
- H04N9/26—Picture reproducers using cathode ray tubes using the same beam for more than one primary colour information using electron-optical colour selection means, e.g. line grid, deflection means in or near the gun or near the phosphor screen
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Transforming Electric Information Into Light Information (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
- Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
Abstract
768,747. Colour television tubes. PHILIPS ELECTRICAL INDUSTRIES, Ltd. Dec. 9, 1954 [Dec. 12, 1953], No. 35679/54. Class 39(1). To improve the control by two parallel-wire colour-selection grids in a cathode ray tube, a fine meshed grid 10 ie provided between the selection grids 8, 9 and the field electrode 7 of the screen having a mesh width not greater than onetenth of the spacing between successive wires of a single selection grid, and a focusing electrode, e.g. one of two annular electrodes 11, 13, a close meshed grid, or a combination of both, is disposed between the colour selection grids and scanning deflections field. The colour grids are not necessarily co-planar, and the screen is luminescent or incandescent and may be monochromatic, its images being projected through colour filters. The focusing electrode may be a frustro-conical ring with or without a mesh grid closing the end nearest the screen ; or two annular rings without a mesh grid or, as shown in Fig. 4, with a mesh grid 12 closing the inner surface of the first ring 11. Two frustroconical electrodes may be associated so as to give the beam an orthogonal approach to the selection grids, Fig. 5 (not shown). The focusing electrode may be a grid 16 alone, or advantageously, as shown in Fig. 7, associated with an annular electrode 17 which is at a potential lower than that of the grid 16, which itself exceeds the mean potential of the colour grids 8, 9, but is lower than that of the screen 7. The mean colour selection potential does not exceed one tenth the potential of the screen and the potential of the fine meshed grid is at most equal to the mean potential of the former and is not more than 10V lower than its lowest potential. The electrodes 8, 9, 11 form a retarding lens up to which the electrons travel at high velocity yet they reach the selection grids at a low velocity and are there controlled by small voltage variations.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL325694X | 1953-12-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB768747A true GB768747A (en) | 1957-02-20 |
Family
ID=19784165
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB35679/54A Expired GB768747A (en) | 1953-12-12 | 1954-12-09 | Improvements in or relating to devices for reproducing coloured television images |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US2813224A (en) |
| BE (1) | BE534064A (en) |
| CH (1) | CH325694A (en) |
| DE (1) | DE942277C (en) |
| FR (1) | FR1117515A (en) |
| GB (1) | GB768747A (en) |
| NL (1) | NL183551B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2921228A (en) * | 1954-05-18 | 1960-01-12 | Itt | Color television apparatus |
| US2888603A (en) * | 1954-12-29 | 1959-05-26 | Gen Electric | Color television tube and method for color television |
| US3028521A (en) * | 1956-12-21 | 1962-04-03 | Zenith Radio Corp | Image-reproducting device |
| US3205391A (en) * | 1957-11-18 | 1965-09-07 | Multi Tron Lab Inc | Negative-lens type deflection magnifying means for electron beam in cathode ray tubes |
| US3005927A (en) * | 1958-01-27 | 1961-10-24 | Rca Corp | Cathode-ray tubes of the focus-mask variety |
| US2981864A (en) * | 1958-06-26 | 1961-04-25 | Sylvania Electric Prod | Image display device |
| NL243432A (en) * | 1958-09-26 | |||
| NL262474A (en) * | 1960-03-17 | |||
| US3136918A (en) * | 1960-12-16 | 1964-06-09 | Rca Corp | Cathode ray tube and method of operation |
| JPH056742A (en) * | 1991-06-27 | 1993-01-14 | Mitsubishi Electric Corp | Cathode-ray tube |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2545123A (en) * | 1946-05-20 | 1951-03-13 | Rca Corp | Computing device |
| US2496127A (en) * | 1947-02-05 | 1950-01-31 | Rca Corp | Electron gun for cathode-ray tubes |
| NL168576B (en) * | 1951-04-04 | Teutonia Cementwerk | METHOD OF FIRMING SOIL. |
-
0
- BE BE534064D patent/BE534064A/xx unknown
- NL NLAANVRAGE7510464,A patent/NL183551B/en unknown
-
1954
- 1954-12-09 GB GB35679/54A patent/GB768747A/en not_active Expired
- 1954-12-10 US US474363A patent/US2813224A/en not_active Expired - Lifetime
- 1954-12-10 CH CH325694D patent/CH325694A/en unknown
- 1954-12-10 DE DEN9879A patent/DE942277C/en not_active Expired
- 1954-12-13 FR FR1117515D patent/FR1117515A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR1117515A (en) | 1956-05-23 |
| BE534064A (en) | |
| US2813224A (en) | 1957-11-12 |
| DE942277C (en) | 1956-05-03 |
| NL183551B (en) | |
| CH325694A (en) | 1957-11-15 |
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