EP0440234A2 - Canon à électrons pour un tube d'image en couleurs - Google Patents

Canon à électrons pour un tube d'image en couleurs Download PDF

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Publication number
EP0440234A2
EP0440234A2 EP91101302A EP91101302A EP0440234A2 EP 0440234 A2 EP0440234 A2 EP 0440234A2 EP 91101302 A EP91101302 A EP 91101302A EP 91101302 A EP91101302 A EP 91101302A EP 0440234 A2 EP0440234 A2 EP 0440234A2
Authority
EP
European Patent Office
Prior art keywords
electrode
postarranged
prearranged
electron gun
electron beam
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Withdrawn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
EP91101302A
Other languages
German (de)
English (en)
Other versions
EP0440234A3 (en
Inventor
Kyungnam Kim
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.)
Samsung SDI Co Ltd
Original Assignee
Samsung Display Devices Co Ltd
Samsung Electron Devices Co 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
Application filed by Samsung Display Devices Co Ltd, Samsung Electron Devices Co Ltd filed Critical Samsung Display Devices Co Ltd
Publication of EP0440234A2 publication Critical patent/EP0440234A2/fr
Publication of EP0440234A3 publication Critical patent/EP0440234A3/en
Withdrawn legal-status Critical Current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
    • 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
    • H01J29/488—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
    • H01J29/48—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
    • 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
    • H01J2229/4844—Electron guns characterised by beam passing apertures or combinations
    • H01J2229/4848—Aperture shape as viewed along beam axis
    • H01J2229/4872—Aperture shape as viewed along beam axis circular

Definitions

  • the present invention relates to an electron gun structure for color picture tubes for improving the focusing function thereof by complementing the distortions of the electron beams landed on the portions near the periphery of the screen of the color picture tube.
  • the resolution of a cathode ray tube is closely related to the size of the electron beams landed on the phosphor screen thereof, and the smaller the size of the electron beam is, the better resolution is obtained.
  • the main lens system and subordinate lens system should be functionally improved.
  • the cathode ray tube comprises, as shown in Fig. 5, a bulb formed of a panel A, funnel B and neck C, electron guns E mounted inside the neck C for producing electron beams, and deflecting means F mounted between the aforesaid funnel B and neck C for deflecting the electron beams to pattern raster on the screen.
  • the horizontal focusing distance and the vertical focusing distance are equal to each other in order to form the optimum focusing point in the central portion of the screen.
  • U. S. Patent No. 4,866,335 proposed a method for improving the focusing characteristics by reducing the initially diverging region of the electron beam and expanding the next converging region so as to minimize the diameter of the beam spot.
  • the electron gun having a cathode K and the first to sixth electrodes coaxially arranged must be a dynamic focusing type of electron gun, wherein the fifth electrode G5 comprises a main electrode G5' and a subordinate electrode G5'', and the voltage applied to the subordinate electrode G5'' is varied according to the deflecting signal of the deflecting yoke and the synchronizing signal.
  • the applied dynamic voltage becomes higher towards the peripheral portions of the screen.
  • the horizontal frequency is 15.75KHz and the vertical frequency 60Hz
  • the vertical dynamic voltage waveform is overlapped by 262.5 horizontal dynamic waveforms as shown in Fig. 8.
  • the focusing voltage in the peripheral portions of the screen becomes about 1000v higher than that in the central portion of the screen, which comes to be identical with the optimum focusing voltage in the peripheral portions.
  • the aberration causes the electron beam to be transversely distorted in the peripheral portions of the screen as shown in Fig. 9.
  • the object of the present invention is to provide an electron gun structure for color picture tubes, thereby eliminating the transverse distortion of the electron beam in the peripheral portions of the screen.
  • an electron gun structure for color picture tubes comprises a prearranged electrode, a postarranged electrode, an extension flange perpendicularly formed along the periphery of the back end of said prearranged electrode, another extension flange perpendicularly formed along the periphery of the front end of said postarranged electrode, said both extension flanges being opposed to each other, and the electron beam passing apertures being disposed relatively inside said electrodes, wherein said prearranged electrode is supplied with a static voltage and said postarranged electrode with a dynamic focusing voltage which is varied according to a deflecting signal and a synchronizing signal, so that said prearranged electrode forms a convex converging lens to have a converging force which acts stronger vertically than horizontally, and said postarranged electrode forms a concave diverging lens to have a diverging force stronger vertically than horizontally so as to expand the landing area of said electron beam vertically, thus said two lenses serving the complementary action to make the landing area of said electron beam circular throughout the screen of said color picture tube.
  • the extension flanges are integrally formed with said prearranged electrode and postarranged electrode respectively, or by connecting additional strips to said electrodes.
  • the static voltage may be 400-1000V, and the dynamic voltage 7-10KV.
  • a cathode 10 is supplied with 100V-500V to emit electron beams.
  • the first electrode 12 applied with the ground voltage, second electrode 14, third electrode 16, fourth electrode 18, fifth electrode 20 and sixth electrode 22 are arranged coaxially with the cathode 10, which are fixedly mounted in a bead glass not shown.
  • the back end surface of the fourth electrode 18 and the front end surface of the fifth electrode 20 which are opposed to each other are respectively provided with horizontal extension flanges 24 and 26, and the fifth electrode 20 is supplied with dynamic focusing voltage Vd, thereby forming a quadruple lens comprising the fourth and fifth electrodes 18 and 20 respectively as prearranged and postarranged, which is different from the conventional electron gun.
  • the aforesaid quadruple lens effect may be obtained by supplying the second and fourth electrodes 14 and 18 with a static voltage Eg2 of 400V-1000V, the third electrode 16 with a dynamic focusing voltage Ef of 7KV-10KV, and the fifth electrode 20 with another dynamic focusing voltage Vd of 7KV-8KV.
  • the first electrode 28 is respectively supplied with the ground voltage, the second, fourth and sixth electrodes 30, 32 and 34 with a static voltage Eg2, the third and fifth electrodes 36 and 38 with focusing voltage Ef.
  • the seventh electrode 40 is supplied with a dynamic focusing voltage Vd, so that the sixth and seventh electrodes 34 and 40 form the prearranged and postarranged ones respectively.
  • the extension flanges 24, 26, 42, 44 may integrally formed with the prearranged fourth electrode 18 (the sixth electrode 34 in case of 8 electrodes structure) and the postarranged fifth electrode 20 (the seventh electrode 40 in case of 8 electrodes structure) respectively in the form of a cup as shown in Fig. 3, otherwise a strips 46 are separately prepared and may be attached to the prearranged and postarranged electrodes by welding, etc., as shown in Fig. 4.
  • the prearranged and postarranged electrodes are supplied with voltages respectively so that the dynamic focusing voltage is varied according to the deflecting signal and synchronizing signal to apply a voltage which is higher vertically than horizontally, thereby resulting in the vertically expanded electron beam which complements the transverse distortion of the electron beam caused by the aberration of the deflecting yoke in the peripheral portions of the screen.
  • the side of the prearranged electrode forms a convex focusing type of lens to have a focusing type of force which acts stronger vertically than horizontally so as to cause the transverse distortion of the electron beam
  • the postarranged electrode forms a concave lens to have a diverging force which acts stronger vertically than horizontally so as to cause the vertical distortion of the electron beam. Accordingly, the focusing force and diverging force are counterbalanced to form a circular spot of the electron beam in the end.
  • the inventive electron gun can solve the problems of the conventional electron gun so as to attain the optimum focus throughout the screen, thereby improving the resolution.

Landscapes

  • Details Of Television Scanning (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
EP19910101302 1990-01-31 1991-01-31 Electron gun structure for color picture tubes Withdrawn EP0440234A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR2019900001123U KR920005828Y1 (ko) 1990-01-31 1990-01-31 칼라 음극선관용 전자총 구조체
KR112390U 1990-01-31

Publications (2)

Publication Number Publication Date
EP0440234A2 true EP0440234A2 (fr) 1991-08-07
EP0440234A3 EP0440234A3 (en) 1992-01-15

Family

ID=19295659

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910101302 Withdrawn EP0440234A3 (en) 1990-01-31 1991-01-31 Electron gun structure for color picture tubes

Country Status (3)

Country Link
EP (1) EP0440234A3 (fr)
JP (1) JPH0466753U (fr)
KR (1) KR920005828Y1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0569946A1 (fr) * 1992-05-14 1993-11-18 Litton Systems, Inc. Canon à électrons à haute résolution
NL9301756A (nl) * 1992-12-17 1994-07-18 Samsung Display Devices Co Ltd dynamisch focuserend elektronen kanon.
EP0641010A2 (fr) * 1993-08-25 1995-03-01 Chunghwa Picture Tubes, Ltd. Correction dynamique de défocalisation désaxée pour tube à rayons cathodiques à lentille de déflexion
EP0655765A1 (fr) * 1993-11-30 1995-05-31 ORION ELECTRIC Co., Ltd. Canon à électrons pour tube image couleur

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4581560A (en) * 1981-12-16 1986-04-08 Hitachi, Ltd. Electron gun for color picture tube
JPS61107636A (ja) * 1984-10-31 1986-05-26 Toshiba Corp 電子銃
DE3614700A1 (de) * 1985-04-30 1986-11-06 Hitachi, Ltd., Tokio/Tokyo Kathodenstrahlroehre
EP0265683A1 (fr) * 1986-09-29 1988-05-04 Rca Licensing Corporation Dispositif d'affichage en couleurs et tube à rayons cathodiques

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5566839A (en) * 1978-11-14 1980-05-20 Toshiba Corp Electron gun
JPS6199249A (ja) * 1984-10-18 1986-05-17 Matsushita Electronics Corp 受像管装置
JPS61131343A (ja) * 1984-11-30 1986-06-19 Hitachi Ltd カラ−受像管用電子銃
US4742266A (en) * 1987-07-20 1988-05-03 Rca Corporation Color picture tube having an inline electron gun with an einzel lens

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4581560A (en) * 1981-12-16 1986-04-08 Hitachi, Ltd. Electron gun for color picture tube
JPS61107636A (ja) * 1984-10-31 1986-05-26 Toshiba Corp 電子銃
DE3614700A1 (de) * 1985-04-30 1986-11-06 Hitachi, Ltd., Tokio/Tokyo Kathodenstrahlroehre
EP0265683A1 (fr) * 1986-09-29 1988-05-04 Rca Licensing Corporation Dispositif d'affichage en couleurs et tube à rayons cathodiques

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Electronic Components and Applications, Vol. 9, No. 1, 1989, Eindhoven NL, pages 31-34; J. GERRITSEN et al.: "The Ploygon gun... for a cleaner, sharper electron spot", page 32; figures 2,3. *
PATENT ABSTRACTS OF JAPAN, Vol. 10, No. 289 (E-442)(2345) 2 October 1986; & JP,A,61 107 636 (TOSHIBA CORP.) 26 May 1986, Abstract. *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0569946A1 (fr) * 1992-05-14 1993-11-18 Litton Systems, Inc. Canon à électrons à haute résolution
NL9301756A (nl) * 1992-12-17 1994-07-18 Samsung Display Devices Co Ltd dynamisch focuserend elektronen kanon.
EP0641010A2 (fr) * 1993-08-25 1995-03-01 Chunghwa Picture Tubes, Ltd. Correction dynamique de défocalisation désaxée pour tube à rayons cathodiques à lentille de déflexion
EP0641010A3 (fr) * 1993-08-25 1996-02-07 Chunghwa Picture Tubes Ltd Correction dynamique de défocalisation désaxée pour tube à rayons cathodiques à lentille de déflexion.
EP0655765A1 (fr) * 1993-11-30 1995-05-31 ORION ELECTRIC Co., Ltd. Canon à électrons pour tube image couleur
US5754014A (en) * 1993-11-30 1998-05-19 Orion Electric Co., Ltd. Electron gun for a color picture tube

Also Published As

Publication number Publication date
KR920005828Y1 (ko) 1992-08-22
JPH0466753U (fr) 1992-06-12
KR910014663U (ko) 1991-08-31
EP0440234A3 (en) 1992-01-15

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