GB2020092A – High potential, low magnification electron gun
– Google Patents
GB2020092A – High potential, low magnification electron gun
– Google Patents
High potential, low magnification electron gun
Info
Publication number
GB2020092A
GB2020092A
GB7912616A
GB7912616A
GB2020092A
GB 2020092 A
GB2020092 A
GB 2020092A
GB 7912616 A
GB7912616 A
GB 7912616A
GB 7912616 A
GB7912616 A
GB 7912616A
GB 2020092 A
GB2020092 A
GB 2020092A
Authority
GB
United Kingdom
Prior art keywords
gun
region
electron
apertured
volts
Prior art date
1978-04-12
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.)
Granted
Application number
GB7912616A
Other versions
GB2020092B
(en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RCA Corp
Original Assignee
RCA Corp
Priority date (The priority date 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 date listed.)
1978-04-12
Filing date
1979-04-10
Publication date
1979-11-07
1979-04-10
Application filed by RCA Corp
filed
Critical
RCA Corp
1979-11-07
Publication of GB2020092A
publication
Critical
patent/GB2020092A/en
1983-01-06
Application granted
granted
Critical
1983-01-06
Publication of GB2020092B
publication
Critical
patent/GB2020092B/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
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
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.
GB7912616A
1978-04-12
1979-04-10
High potential low magnification electron gun
Expired
GB2020092B
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
US89558878A
1978-04-12
1978-04-12
Publications (2)
Publication Number
Publication Date
GB2020092A
true
GB2020092A
(en)
1979-11-07
GB2020092B
GB2020092B
(en)
1983-01-06
Family
ID=25404723
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB7912616A
Expired
GB2020092B
(en)
1978-04-12
1979-04-10
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)
FI791127A
(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)
Cited By (5)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
EP0117475A1
(en)
*
1983-02-14
1984-09-05
Matsushita Electronics Corporation
Cathode ray tube
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
EP0237005A2
(en)
*
1986-03-11
1987-09-16
Matsushita Electronics Corporation
cathode ray tube for color display
US6072271A
(en)
*
1994-08-26
2000-06-06
Thomson Tubes And Display, S.A.
Inline electron gun having improved beam forming region
Families Citing this family (3)
* Cited by examiner, † Cited by third party
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
NL8204185A
(en)
*
1982-10-29
1984-05-16
Philips Nv
CATHED BEAM TUBE.
JP2000243218A
(en)
1999-02-17
2000-09-08
Nec Corp
Electron emitting device and its drive method therefor
Family Cites Families (7)
* Cited by examiner, † Cited by third party
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
FI
FI791127A
patent/FI791127A/en
not_active
Application Discontinuation
1979-04-05
ES
ES479316A
patent/ES479316A1/en
not_active
Expired
1979-04-06
IT
IT2166379A
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
BR
BR7902199A
patent/BR7902199A/en
unknown
1979-04-10
BE
BE2/57714A
patent/BE875443A/en
unknown
1979-04-10
MX
MX10068379U
patent/MX4332E/en
unknown
1979-04-10
CZ
CS792467A
patent/CZ278259B6/en
unknown
1979-04-11
PL
PL21482879A
patent/PL126827B1/en
unknown
1979-04-11
SU
SU792748999A
patent/SU1722254A3/en
active
1979-04-11
DE
DE19792914838
patent/DE2914838C2/en
not_active
Expired
1979-04-11
DD
DD21215679A
patent/DD143125A5/en
not_active
IP Right Cessation
1979-04-11
JP
JP4483479A
patent/JPS54145472A/en
active
Granted
1979-04-11
NL
NL7902868A
patent/NL189323C/en
not_active
IP Right Cessation
1987
1987-08-13
HK
HK59887A
patent/HK59887A/en
not_active
IP Right Cessation
Cited By (6)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
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
EP0117475A1
(en)
*
1983-02-14
1984-09-05
Matsushita Electronics Corporation
Cathode ray tube
EP0237005A2
(en)
*
1986-03-11
1987-09-16
Matsushita Electronics Corporation
cathode ray tube for color display
EP0237005A3
(en)
*
1986-03-11
1988-10-12
Matsushita Electronics Corporation
Cathode ray tube for color display
US6072271A
(en)
*
1994-08-26
2000-06-06
Thomson Tubes And Display, S.A.
Inline electron gun having improved beam forming region
Also Published As
Publication number
Publication date
BE875443A
(en)
1979-07-31
IT1112465B
(en)
1986-01-13
NL189323C
(en)
1993-03-01
SU1722254A3
(en)
1992-03-23
DD143125A5
(en)
1980-07-30
MX4332E
(en)
1982-03-25
PL214828A1
(en)
1980-05-05
ES479316A1
(en)
1979-06-16
CA1138519A
(en)
1982-12-28
CZ246779A3
(en)
1993-06-16
PL126827B1
(en)
1983-09-30
HK59887A
(en)
1987-08-21
DE2914838C2
(en)
1986-11-06
FI791127A
(en)
1979-10-13
AU4515779A
(en)
1979-10-18
CZ278259B6
(en)
1993-11-17
GB2020092B
(en)
1983-01-06
NL7902868A
(en)
1979-10-16
DE2914838A1
(en)
1979-10-18
JPH0419660B2
(en)
1992-03-31
BR7902199A
(en)
1979-12-04
NL189323B
(en)
1992-10-01
IT7921663D0
(en)
1979-04-06
JPS54145472A
(en)
1979-11-13
FR2423057A1
(en)
1979-11-09
FR2423057B1
(en)
1984-03-02
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Legal Events
Date
Code
Title
Description
1989-07-12
732
Registration of transactions, instruments or events in the register (sect. 32/1977)
1999-05-05
PE20
Patent expired after termination of 20 years
Effective date:
19990409
