HK59887A - High potential, low magnification electron gun - Google Patents
High potential, low magnification electron gunInfo
- Publication number
- HK59887A HK59887A HK598/87A HK59887A HK59887A HK 59887 A HK59887 A HK 59887A HK 598/87 A HK598/87 A HK 598/87A HK 59887 A HK59887 A HK 59887A HK 59887 A HK59887 A HK 59887A
- Authority
- HK
- Hong Kong
- Prior art keywords
- gun
- region
- electron
- apertured
- volts
- Prior art date
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
- H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
- H01J29/48—Electron guns
- H01J29/50—Electron guns two or more guns in a single vacuum space, e.g. for plural-ray tube
- H01J29/503—Three or more guns, the axes of which lay in a common plane
-
- 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
- H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
- H01J29/58—Arrangements for focusing or reflecting ray or beam
- H01J29/62—Electrostatic lenses
- H01J29/622—Electrostatic lenses producing fields exhibiting symmetry of revolution
- H01J29/624—Electrostatic lenses producing fields exhibiting symmetry of revolution co-operating with or closely associated to an electron gun
Landscapes
- Electrodes For Cathode-Ray Tubes (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
- Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
- Cold Cathode And The Manufacture (AREA)
Abstract
An electron gun, especially for use in color picture tubes, comprises in the order named: a cathode, an apertured- plate control grid (G1), an apertured- plate screen grid (G2), and at least two tubular focusing electrodes (G3 and G4). The quality of the gun's beam spot may be improved by (1) Establishing an operating electric field between the G2 and G3 which is between about 100 and 400 volts/mil (3937-15748 volts/mm), thereby reducing aberration effects in the beam-forming region of the gun; (2) Making G2 thick so as to prevent the high G3 voltage from penetrating the region between the G1 and G2, thereby allowing the G1-G2 field to provide a divergent effect on the electron beam prior to beam crossover and thus give a reduced crossover angle; (3) Elongating G3 to provide an optimum filling of the main focus lens with the beam to maximize the object distance of the focusing system; and (4) Structuring G2 and G3 to provide a flat electrostatic field therebetween to avoid prefocusing action in that region, so as not to cause an effective reduction of the object distance of the focusing system. The electron optics, and aberrational effects countered, are detailed. Dimensions and electric potentials are given, and alternative G2 constructions described (Figures 10,11 not shown). Magnetic members 46 correct coma. Guns may be in-line or delta array, and of uni-, bi-, or tripotential lens construction. <IMAGE>
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US89558878A | 1978-04-12 | 1978-04-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| HK59887A true HK59887A (en) | 1987-08-21 |
Family
ID=25404723
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| HK598/87A HK59887A (en) | 1978-04-12 | 1987-08-13 | High potential, low magnification electron gun |
Country Status (18)
| Country | Link |
|---|---|
| JP (1) | JPS54145472A (en) |
| AU (1) | AU4515779A (en) |
| BE (1) | BE875443A (en) |
| BR (1) | BR7902199A (en) |
| CA (1) | CA1138519A (en) |
| CZ (1) | CZ278259B6 (en) |
| DD (1) | DD143125A5 (en) |
| DE (1) | DE2914838C2 (en) |
| ES (1) | ES479316A1 (en) |
| FI (1) | FI791127A7 (en) |
| FR (1) | FR2423057A1 (en) |
| GB (1) | GB2020092B (en) |
| HK (1) | HK59887A (en) |
| IT (1) | IT1112465B (en) |
| MX (1) | MX4332E (en) |
| NL (1) | NL189323C (en) |
| PL (1) | PL126827B1 (en) |
| SU (1) | SU1722254A3 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4234814A (en) * | 1978-09-25 | 1980-11-18 | Rca Corporation | Electron gun with astigmatic flare-reducing beam forming region |
| US4498028A (en) * | 1981-09-28 | 1985-02-05 | Zenith Electronics Corporation | Ultra-short LoBi electron gun for very short cathode ray tubes |
| US4529910A (en) * | 1982-03-31 | 1985-07-16 | Zenith Electronics Corporation | High-performance electron gun |
| NL8204185A (en) * | 1982-10-29 | 1984-05-16 | Philips Nv | CATHED BEAM TUBE. |
| JPS59148242A (en) * | 1983-02-14 | 1984-08-24 | Matsushita Electronics Corp | Picture tube device |
| EP0237005A3 (en) * | 1986-03-11 | 1988-10-12 | Matsushita Electronics Corporation | Cathode ray tube for color display |
| FR2724048B1 (en) * | 1994-08-26 | 1997-01-10 | Thomson Tubes & Displays | COPLANAR ELECTRONIC CANNON WITH IMPROVED BEAM FORMATION ZONE |
| JP2000243218A (en) | 1999-02-17 | 2000-09-08 | Nec Corp | Electron emitting device and its drive method therefor |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1156511B (en) * | 1957-10-28 | 1963-10-31 | Rauland Corp | Beam generation system for a cathode-modulated cathode ray tube |
| US3090882A (en) * | 1960-04-13 | 1963-05-21 | Rca Corp | Electron gun |
| US3295001A (en) * | 1963-06-04 | 1966-12-27 | Sylvania Electric Prod | Cathode ray tube gun having a second grid with an effective thickness |
| US3374379A (en) * | 1964-03-02 | 1968-03-19 | Nippon Columbia | Low second grid voltage electron gun |
| BE793992A (en) * | 1972-01-14 | 1973-05-02 | Rca Corp | CATHODIC RAY TUBE |
| JPS5522906B2 (en) * | 1974-05-20 | 1980-06-19 | ||
| US3995194A (en) * | 1974-08-02 | 1976-11-30 | Zenith Radio Corporation | Electron gun having an extended field electrostatic focus lens |
-
1979
- 1979-03-15 AU AU45157/79A patent/AU4515779A/en not_active Abandoned
- 1979-04-02 CA CA000324578A patent/CA1138519A/en not_active Expired
- 1979-04-05 ES ES479316A patent/ES479316A1/en not_active Expired
- 1979-04-05 FI FI791127A patent/FI791127A7/en not_active Application Discontinuation
- 1979-04-06 IT IT7921663A patent/IT1112465B/en active
- 1979-04-09 FR FR7908890A patent/FR2423057A1/en active Granted
- 1979-04-10 GB GB7912616A patent/GB2020092B/en not_active Expired
- 1979-04-10 BE BE2/57714A patent/BE875443A/en unknown
- 1979-04-10 BR BR7902199A patent/BR7902199A/en unknown
- 1979-04-10 CZ CS792467A patent/CZ278259B6/en unknown
- 1979-04-10 MX MX79100683U patent/MX4332E/en unknown
- 1979-04-11 NL NLAANVRAGE7902868,A patent/NL189323C/en not_active IP Right Cessation
- 1979-04-11 DD DD79212156A patent/DD143125A5/en not_active IP Right Cessation
- 1979-04-11 PL PL1979214828A patent/PL126827B1/en unknown
- 1979-04-11 SU SU792748999A patent/SU1722254A3/en active
- 1979-04-11 JP JP4483479A patent/JPS54145472A/en active Granted
- 1979-04-11 DE DE2914838A patent/DE2914838C2/en not_active Expired
-
1987
- 1987-08-13 HK HK598/87A patent/HK59887A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| CZ246779A3 (en) | 1993-06-16 |
| JPS54145472A (en) | 1979-11-13 |
| GB2020092B (en) | 1983-01-06 |
| NL189323B (en) | 1992-10-01 |
| FR2423057B1 (en) | 1984-03-02 |
| NL7902868A (en) | 1979-10-16 |
| IT7921663A0 (en) | 1979-04-06 |
| PL126827B1 (en) | 1983-09-30 |
| DE2914838A1 (en) | 1979-10-18 |
| JPH0419660B2 (en) | 1992-03-31 |
| ES479316A1 (en) | 1979-06-16 |
| FI791127A7 (en) | 1981-01-01 |
| FR2423057A1 (en) | 1979-11-09 |
| SU1722254A3 (en) | 1992-03-23 |
| CZ278259B6 (en) | 1993-11-17 |
| DE2914838C2 (en) | 1986-11-06 |
| CA1138519A (en) | 1982-12-28 |
| BE875443A (en) | 1979-07-31 |
| NL189323C (en) | 1993-03-01 |
| PL214828A1 (en) | 1980-05-05 |
| MX4332E (en) | 1982-03-25 |
| GB2020092A (en) | 1979-11-07 |
| IT1112465B (en) | 1986-01-13 |
| BR7902199A (en) | 1979-12-04 |
| DD143125A5 (en) | 1980-07-30 |
| AU4515779A (en) | 1979-10-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PE | Patent expired |