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GB1400810A - Electron gun assembly with unitary lens system - Google Patents

Electron gun assembly with unitary lens system

Info

Publication number
GB1400810A
GB1400810A GB6012472A GB6012472A GB1400810A GB 1400810 A GB1400810 A GB 1400810A GB 6012472 A GB6012472 A GB 6012472A GB 6012472 A GB6012472 A GB 6012472A GB 1400810 A GB1400810 A GB 1400810A
Authority
GB
United Kingdom
Prior art keywords
lens
lens system
lenses
electron gun
dec
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
Application number
GB6012472A
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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.)
Filing date
Publication date
Priority claimed from JP236072A external-priority patent/JPS4874973A/ja
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Publication of GB1400810A publication Critical patent/GB1400810A/en
Expired legal-status Critical Current

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
    • H01J29/488—Schematic arrangements of the electrodes for beam forming; Place and form of the elecrodes
    • 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
    • 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

  • Cold Cathode And The Manufacture (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)

Abstract

1400810 Electron guns HITACHI Ltd 29 Dec 1972 [30 Dec 1971] 60124/72 Heading H1D The gun of a cathode ray tube having a fluorescent screen includes a lens system formed of at least two aligned lenses, the cross-over point a, Fig. 2, of the beam emitted from the cathode being formed by a prefocusing lens system at the focal point of the first lens L 1 , to collimate the beam parallel to the axis between the two lenses, whereby the effect of a large aperture lens is produced while avoiding the aberration which would be associated therewith. As shown, electrodes G 3 , G 4 constitute a bipotential lens, and electrodes G 4 , G 5 , and G 6 a unipotential lens, the length of G 4 being chosen greater than its diameter, and that of G 3 substantially equal to the focal length of the first lens L 1 . In further embodiments, the lens system is formed by two unipotential lenses (Fig. 3, not shown) or by two bipotential lenses (Fig. 4, not shown).
GB6012472A 1971-12-30 1972-12-29 Electron gun assembly with unitary lens system Expired GB1400810A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP236072A JPS4874973A (en) 1971-12-30 1971-12-30
JP236071 1971-12-30

Publications (1)

Publication Number Publication Date
GB1400810A true GB1400810A (en) 1975-07-23

Family

ID=26335724

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6012472A Expired GB1400810A (en) 1971-12-30 1972-12-29 Electron gun assembly with unitary lens system

Country Status (4)

Country Link
CA (1) CA963068A (en)
DE (1) DE2264113A1 (en)
FR (1) FR2166165B1 (en)
GB (1) GB1400810A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2130004A (en) * 1982-10-29 1984-05-23 Philips Nv Cathode-ray tube
GB2294581A (en) * 1994-10-24 1996-05-01 Sony Corp Electron gun for a cathode ray tube

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS545374A (en) * 1977-06-15 1979-01-16 Hitachi Ltd Electronic gun
JPS5480666A (en) * 1977-12-09 1979-06-27 Mitsubishi Electric Corp Electron gun
GB2015195A (en) * 1978-02-15 1979-09-05 Tektronix Inc Cathode Ray Tube Having Low Voltage Focus and Dynamic Correction

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2130004A (en) * 1982-10-29 1984-05-23 Philips Nv Cathode-ray tube
GB2294581A (en) * 1994-10-24 1996-05-01 Sony Corp Electron gun for a cathode ray tube
GB2294581B (en) * 1994-10-24 1998-07-15 Sony Corp Cathode ray tube and electron gun for a cathode ray tube

Also Published As

Publication number Publication date
CA963068A (en) 1975-02-18
DE2264113A1 (en) 1973-07-12
FR2166165A1 (en) 1973-08-10
FR2166165B1 (en) 1976-10-29

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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