EP0655763A1 - Elektronenkanone für eine Farbbildröhre - Google Patents

Elektronenkanone für eine Farbbildröhre Download PDF

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Publication number
EP0655763A1
EP0655763A1 EP94118716A EP94118716A EP0655763A1 EP 0655763 A1 EP0655763 A1 EP 0655763A1 EP 94118716 A EP94118716 A EP 94118716A EP 94118716 A EP94118716 A EP 94118716A EP 0655763 A1 EP0655763 A1 EP 0655763A1
Authority
EP
European Patent Office
Prior art keywords
focusing
electrodes
lens
electron gun
beam passing
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.)
Withdrawn
Application number
EP94118716A
Other languages
English (en)
French (fr)
Inventor
O-So Kwon
Francis Joseph Campbell
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.)
Orion Electric Co Ltd Korea
Original Assignee
Orion Electric Co Ltd Korea
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
Application filed by Orion Electric Co Ltd Korea filed Critical Orion Electric Co Ltd Korea
Publication of EP0655763A1 publication Critical patent/EP0655763A1/de
Withdrawn legal-status Critical Current

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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
    • H01J29/48—Electron guns
    • H01J29/50—Electron guns two or more guns in a single vacuum space, e.g. for plural-ray tube
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/48—Electron guns
    • H01J2229/4834—Electrical arrangements coupled to electrodes, e.g. potentials
    • H01J2229/4837—Electrical arrangements coupled to electrodes, e.g. potentials characterised by the potentials applied
    • H01J2229/4841—Dynamic potentials

Definitions

  • the present invention relates to an electron gun for a color picture tube, and particularly to an in-line type electron gun for a color picutre tube.
  • An electron gun for a color picture tube is mounted in the neck of the tube and generates thermions. It generally comprises a triple electrodes part having one or more cathodes as the source of thermions, a prefocusing lens part and a main lens part for forming electromagnetic lens by the potential difference.
  • the magnification of the main electromagnetic lens formed therebetween is enlarged to inflict a large spherical aberration to the electron beam passing therethrough.
  • a rim electrode 10 having a large beam passing hole 11 though which three beams concurrently pass, to weaken the magnification of the electromagnetic lens and reduce the spherical aberration.
  • the reduced magnification of the main lens cannot sufficiently focus the electron beam, thus the prefocusing lens part is fabricated between the main lens part and the triple electrodes part to stepwisely focus the electron beam from the triple electrodes.
  • a plurality of focusing electrodes having beam passing holes for forming a plurality of quadrapole lenses are fabricated between the triple electrodes part and the main lens part, and a voltage applying to the triple electrodes part or a high voltage applying to an anode electrode, which constitutes the main lens part, is selectively applied to those electrodes to focus the electron beam.
  • a voltage applying to the triple electrodes part or a high voltage applying to an anode electrode, which constitutes the main lens part is selectively applied to those electrodes to focus the electron beam.
  • an electron gun for a color picture tube having a triple electrodes part as a source of the electron beam, a prefocusing lens part coaxially fabricated with the triple electrodes part for focusing and accelerating the electron beam from the triple electrodes part, and a main lens part, is characterized in that: the prefocusing lens part includes a plurality of focusing electrodes to which two different focusing voltages selectively applied, for forming at least one quadrapole lens in which the intensity of the vertical electromagnetic lens is weaker than that of horizontal lens.
  • those two focusing voltages fall into the range of 20% to 25% of the anode voltage of the main lens part.
  • An electron gun for a color picture tube comprises: a triple electrodes part containing a cathode as a source of thermions, a control electrode and a screen electrode; a prefocusing lens part having a plurality of focusing electrodes to which respectively different focusing voltages are selectively applied, to form at least one quadrapole lens in which the intensity of vertical lens is stronger than that of horizontal lens; and a main lens part fabricated coaxially with the prefocusing lens part and having an anode electrode to which an anode voltage is applied, to form a main lens.
  • the first to fourth electrodes 21, 22, 23, 24 are fabricated successively from the triple electrodes part as shown in FIG. 2, and the first focusing voltage VF1 of 6,000 to 7,000V is applied to the second and fourth focusing electrode 22, 24, and the second focusing voltage VF2 of 7,000 to 9000V is applied to the first and third electrode 21, 23.
  • the first and second focusing voltages VF1, VF2 is preferably not being charged by above described voltages but preferably applied thereto the voltage in the range of 20 to 25% of anode voltage, for example about 30KV, which is applied to the anode electrodes for forming the main lens. And those two focusing voltages VF1, VF2 is preferably synchronized with the deflection signal.
  • the upper and lower ends of vertically elongated holes 22G', 24G and each side ends of transeversely elongated holes (23R, 23B), (23R, 23B'), (24R', 24B') are preferably formed at shapes of curves having prescribed curvatures.
  • diameters of circular holes and the heights of transversely elongated holes of wings are preferably formed in the manner of that sizes thereof are gradually increased or same from the first focusing electrodes.
  • at least one couple of three holes formed at facing sides of adjacent electrodes, is preferably formed in the same diameter or height.
  • the electron beam emitted from the cathode of the triple electrodes part is preliminarily focused and accelerated in the prefocusing lens part, then, enters the main lens part.
  • the first to fourth focusing electrodes 21, 22, 23, 24 are successively arranged, and the first focusing voltage VF1 is applied to the second and fourth focusing electrodes 22, 24, and the second focusing voltage VF2 to the first and third focusing electrodes 21, 23 to form bi-potential type electromagnetic lenses as shown in FIG. 4 and 5.
  • the potential difference between the first and second voltages VF1, VF2 being applied to each electrodes is not so large, thus electromagnetic lenses formed between each electrodes have relatively small magnifications.
  • the electron beam passing electromagnetic lenses formed between each focusing electrodes 21, 22, 23, 24, suffers small spherical aberrations.
  • vertically elongated holes 22G', 24G and transversely elongated holes(23R, 23B), (23R', 23B') are fabricated between the first to fourth focusing electrodes 21, 22, 23, 24 to form quadrapole lenses, horizontal components of the electron beam suffers larger converging than diverging, and vertical components of the beam suffers larger diverging than converging as shown in FIG, 4.
  • the horizontal component of the beam passes through the central portion of the main lens and the vertical component passes through the peripheral portion of the main lens, thus the vertical component suffers more spherical aberration than the horizontal component to form the beam spot landing on the screen to be circular.
  • diameters of heights of beam passing holes of the first to fourth focusing electrodes 21, 22, 23, 24 for constituting the prefocusing lens part of the gun are successively increased from the first focusing electrode 21 or maintained same, the alignment of each focusing electrodes in assembly can be improved.
  • one or more support rods are inserted through beam passing holes of each electrodes, and then two bead glasses are pressed from each sides of electrodes to embed supports of electrodes therein.
  • the support rod can be reduced in diameter stepwisely to fix each electrodes without any gap to improve the alignment of the assembly.
  • the electron gun for a color picture tube forms a plurality of electromagnetic lenses in the prefocusing lens and focuses the electron beam in multi-step, to reduce the spherical aberration of passing beam, and reduces the incident angle of the main lens part to improve the focusing characteristics of the electron beam landing on the screen.

Landscapes

  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Cold Cathode And The Manufacture (AREA)
EP94118716A 1993-11-30 1994-11-28 Elektronenkanone für eine Farbbildröhre Withdrawn EP0655763A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1019930026168A KR950015511A (ko) 1993-11-30 1993-11-30 칼라 음극선관용 전자총
KR9326168 1993-11-30

Publications (1)

Publication Number Publication Date
EP0655763A1 true EP0655763A1 (de) 1995-05-31

Family

ID=19369663

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94118716A Withdrawn EP0655763A1 (de) 1993-11-30 1994-11-28 Elektronenkanone für eine Farbbildröhre

Country Status (4)

Country Link
EP (1) EP0655763A1 (de)
JP (1) JPH0817359A (de)
KR (1) KR950015511A (de)
CN (1) CN1108798A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0716771B1 (de) * 1994-05-06 1998-07-08 Koninklijke Philips Electronics N.V. Anzeigevorrichtung und kathodenstrahlröhre

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1021847A (ja) * 1996-07-03 1998-01-23 Sony Corp カラー陰極線管用電子銃

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4641058A (en) * 1982-07-05 1987-02-03 Tokyo Shibaura Denki Kabushiki Kaisha Electron gun
GB2224883A (en) * 1988-11-02 1990-05-16 Samsung Electronic Devices Electron gun for color picture tube having unipotential focusing lens
DE4233955A1 (de) * 1992-05-19 1993-11-25 Samsung Electronic Devices Elektronenkanone für eine Farbkathodenstrahlröhre
US5281896A (en) * 1991-09-27 1994-01-25 Samsung Electron Devices Co., Ltd. Electron gun for CRT

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4641058A (en) * 1982-07-05 1987-02-03 Tokyo Shibaura Denki Kabushiki Kaisha Electron gun
GB2224883A (en) * 1988-11-02 1990-05-16 Samsung Electronic Devices Electron gun for color picture tube having unipotential focusing lens
US5281896A (en) * 1991-09-27 1994-01-25 Samsung Electron Devices Co., Ltd. Electron gun for CRT
DE4233955A1 (de) * 1992-05-19 1993-11-25 Samsung Electronic Devices Elektronenkanone für eine Farbkathodenstrahlröhre

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0716771B1 (de) * 1994-05-06 1998-07-08 Koninklijke Philips Electronics N.V. Anzeigevorrichtung und kathodenstrahlröhre

Also Published As

Publication number Publication date
KR950015511A (ko) 1995-06-17
CN1108798A (zh) 1995-09-20
JPH0817359A (ja) 1996-01-19

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