CN1008312B - Electron gun for colour display tube - Google Patents

Electron gun for colour display tube

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Publication number
CN1008312B
CN1008312B CN88101547A CN88101547A CN1008312B CN 1008312 B CN1008312 B CN 1008312B CN 88101547 A CN88101547 A CN 88101547A CN 88101547 A CN88101547 A CN 88101547A CN 1008312 B CN1008312 B CN 1008312B
Authority
CN
China
Prior art keywords
grid
electron gun
electrode
electric field
field correction
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
CN88101547A
Other languages
Chinese (zh)
Other versions
CN88101547A (en
Inventor
小诸英正
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
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Publication of CN88101547A publication Critical patent/CN88101547A/en
Publication of CN1008312B publication Critical patent/CN1008312B/en
Expired legal-status Critical Current

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    • 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
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • 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

Landscapes

  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)

Abstract

In order that an electron gun for a color picture tube furnished with grid electrodes each having a cylinder portion including an inclined end face may be installed in a color picture tube of different size without altering the inclination of the end face of the cylinder, an electrode for correcting an electric field is provided in at least one of the grid electrodes each of which has the cylinder portion including the inclined end face.

Description

Electron gun for colour display tube
The present invention relates to a kind of inline type electron gun that is used for chromoscope, relate in particular in order to form electron lens, to be suitable for the electrode structure of a kind of electrode that improves focusing performance.
Because in inline type electron gun, electron beam is arranged in one plane, therefore, the diameter of main lens is littler than rounded projections arranged formula electron gun.Though, it seems that from aspects such as restriction bias current multiplication factor, focusing the recess diameter of lens tube is a little bit smaller better, main lens diameter becomes littler can reduce focusing performance.In addition, the gap between electron gun external diameter and the described neck internal diameter need schedule, for example, and more than 1 millimeter or 1 millimeter, so that weaken influences such as undesirable electronics emission.Have many suchlike restrictions be since main lens diameter can not strengthen cause.Therefore, in order in these many restrictions, to obtain the good focusing performance, recommended to adopt multistage focused electron rifle as a kind of makeshift.Multistage focused electron rifle can make electron beam focus on gradually, and can improve the spherical aberration of electron lens.
Fig. 4 is the part cross-section side view of typical multistep focusing type electron gun.With reference to this figure, electron gun is made of negative electrode 1, first grid 2, second grid 3, the 3rd grid 4, the 4th grid 5, the 5th grid 6 and the 6th grid 7.Impel the direct projection electron beam to form by the 3rd grid 4, the 4th grid 5 and the 5th grid 6 towards fluoroscopic lens combination in parallel with each other, and impel that this parallel electron beam focuses on this phosphor screen (though, actual focus point is on the shadow mask of chromoscope, but for for simplicity, these focus points all are represented as on phosphor screen hereinafter) another lens combination then is made up of the 5th grid 6 and the 6th grid 7.Main lens comprises these lens combinations.In addition, the 3rd grid utmost point 4 and the 5th grid 6 are to be electrically connected and to add one thereon, for example, be about 7 kilovolts focus voltage, the 4th grid 5 and the 6th grid 7 for example, are about 25 kilovolts anode voltage to be electrically connected and to add one thereon simultaneously.So whole electron gun has the multistep focusing type electron gun of unipotential type again as existing biopotential type, its focusing performance has obtained tangible improvement.Among Fig. 4, the glass supporter of the multiple style of label 8 expressions.
A kind of like this electron gun of chromoscope of structure exists, and for example, is described among the Japanese Patent Application № 63750/1982.Its corresponding US application number is 307,572, as yet not authorization.
When the multistep focusing type electron gun with said structure is used for, for example, during 22 inches chromoscopes, this electron gun has obtained gratifying focusing performance in actual applications.But, particularly existing in recent years necessary produce in enormous quantities 29 inches even larger sized chromoscope.Concerning large-sized like this chromoscope, distance between its electron gun and the phosphor screen is different with conventional picture tube, so at the end face 6 of the 5th grid 6 and formed garden separately, the 6th grid 7 both sides post part ' different with 7 ' gradient, promptly the 5th grid 6 and the 6th grid 7 need be prepared each size.So under the situation according to new size investigative technique condition, it is long that electrode member is made the required cycle, therefore can not in time begin to produce in enormous quantities.That is to say that all need determine its 5th grid and garden, the 6th grid both sides post gradient partly to each product, this just causes very long problems of required cycle such as manufacturing and definite technical conditions.
The objective of the invention is to get rid of the difficulty of above-mentioned prior art, and provide a kind of electron gun of chromoscope, this electron gun under the Zhu Yuanzhu part situation of the existing band inclined end face of same use, just can obtain required focusing angle to various products, and improves focusing performance.
In order to reach this purpose, the main points of electron gun of colour display tube of the present invention are: settle an electric field correction electrode at least in the existing grid of a garden post part with an inclined end face.
As mentioned above, described electric field correction electrode is housed in the electron gun of chromoscope of the present invention, all whereby electron beams move substantially parallelly, and the focusing angle can suitably be controlled.
According to above-mentioned explanation, be applicable to that electron gun of the present invention has described grid, tilt at the post of garden described in this a grid end face partly.Therefore, describedly be applicable to that electron gun of the present invention comprises: make at least two electron beams form basically independently main lens so that second electrode assembly that the precalculated position of these electron beams on predetermined surface (for example, phosphor screen) focuses on along original directive fluoroscopic first electrode assembly in path parallel to each other with for above-mentioned each electron beam path.For this reason, the grid that has with the coaxial aperture of described electron beam path is relatively arranged.
Respectively have with the concentric aperture of these electron beam paths and also have in the grid of the garden post part that an end face tilts with respect to this electron beam path center line at least one, the new electric field correction electrode of settling is arranged in relatively on this garden post part predetermined spacing in electron gun of the present invention.Particularly, this correcting electrode is placed in the inclined plane side of described garden post part.
Make electric field correction electrode flat and make it and described center line quadrature normally suitable, but this allocation plan is not specific.Between the garden post part of electric field correction electrode and grid apart from l 1And l 2Can by experiment or calculate and be determined, so that the straightline propagation electron beam (usually, center electron beam) focus point on predetermined surface and penetrate electron beam partially (usually, outer field electron beam) can be changed into needed value apart from x between same lip-deep focus point, for example x is within 1 millimeter scope.On electric field correction electrode, add suitable positive voltage, and be electrically connected described correcting electrode and corresponding grid normally easy.Much less, described electric field correction electrode also is formed with and is used for the aperture of electron beam separately.
Fig. 1 is the sectional drawing of the major part of the electron gun of colour display tube in the embodiment of the invention;
Fig. 2 and Fig. 3 are the relation of electron gun curve charts in the one embodiment of the invention, and the expression electric field correction electrode is from the distance and the straightline propagation electron beam focus point of the garden of grid post part and penetrate relation between the distance of electron beam focus point partially;
Fig. 4 is the part cross-section side view that is used for the prior art electron gun of chromoscope;
Fig. 5 is the configured in one piece end view of the electron gun of colour display tube in the one embodiment of the invention.
Referring now to these figure, all embodiment of the present invention are elaborated.
Fig. 1 is the sectional drawing of expression electron gun of colour display tube one embodiment major part of the present invention, and wherein same numeral is given the same section in the earlier figures.With reference to Fig. 1, in the inside of the 5th grid 6, electric field correction electrode 6A comprises separately and garden, two outsides post part 6s with angled end-face 1, 6s 2And the coaxial electron beam aperture 6As of garden, center post part 6c 1, 6As 2And 6Ac, correcting electrode 6A then is placed in and described these relative positions of post part, garden.Equally, in the inside of the 6th grid 7, electric field correction electrode 7A comprises separately and garden, two outsides post part 7s with angled end-face 1, 7s 2And the coaxial electron beam aperture 7As of garden, center post part 7c 1, 7As 2And 7Ac, described correcting electrode 7A then is placed in and these relative positions of post part, garden.
In an object lesson of present embodiment, each electron beam aperture center line matches with corresponding garden post center line partly respectively.The diameter of each aperture is 5.5 millimeters, equals the internal diameter of corresponding garden post part.In addition, garden, center post part 6c(or 7c) center line S and side garden post part 6s 1, 6s 2(or 7s 1, 7s 2) center line between distance Y be decided to be 6.6 millimeters.And, n among Fig. 1 1And n 2Length be decided to be 3.1 millimeters and 2.8 millimeters respectively.
In the present embodiment, pancake electric field correction electrode 6A(or 7A) be arranged on grid 6(or 7) the axle core near, but this allocation plan is not specific.In addition, the material that is used for the traditional electrode of picture tube can be used as the material of described electric field correction electrode, and employing and the same material of this grid are easily.
According to a kind of like this configuration structure, be formed at " being in both sides and having inclined end face part 6s of the 5th grid 6 respectively based on all electron lenses of electric field 1, 6s 2And garden, center post part 6c " and " the electron beam aperture 6As of corresponding electric field correction electrode 6A 1, 6As 2And 6Ac " between.Thereby the apparent gradient of the 5th grid 6 formed electron lenses is just proofreaied and correct by above these electron lenses, so that the focusing angle of these electron beams is proofreaied and correct and controlled.Provide electric field correction electrode 7A to the 6th grid 7 equally, availablely whereby be similar to above-mentioned method the apparent gradient of one electron lens is proofreaied and correct.
Character l 1Represent the garden post part 6s in the 5th grid 6 1, 6s 2, 6c and electric field correction electrode 6A respective electronic Shu Xiaokong 6As 1, 6As 2, the axial distance between the 6Ac, and l 2Then represent the garden post part 7s in the 6th grid 7 1, 7s 2, 7c and electric field correction electrode 7A respective electronic Shu Xiaokong 7As 1, 7As 2Axial distance between the 7Ac, along the electron beam of center line S direction focus on distance (distance between the focus point of this electron beam that departs near center line S and the center line of this center electron beam aperture) x that departs from basically with distance l 1Or l 2Value linear, (shown in Fig. 2 (is example with 29 inch 110 degree picture tube)) is and with distance l 1Or l 2The increase of value and reducing.Therefore, by suitable selection axial distance l 1And l 2; Just obtain needed electron beam and focus on angle (for example, make be equal to or less than 1 millimeter) apart from x.In the electron gun example of present embodiment, work as l 2When being decided to be 3.2 millimeters, l 1(millimeter) and x(millimeter) between relation become as shown in Figure 3 curve.L in this example 1Be decided to be 4.5 millimeters, and l 2Be decided to be 3.2 millimeters.
At l 2Be decided to be a certain appropriate value (for example 3.2 millimeters) and use l 1Proofread and correct under the situation at focusing angle of this electron beam, in 3 to 6 millimeters scopes, set l 1Value can obtain gratifying result usually.
Fig. 5 has represented the configured in one piece of an example of the electron gun of colour display tube in the present embodiment.As shown in the drawing, the structure of electron gun 10 is such,, makes negative electrode K, first grid G that is 1, second grid G 2, the 3rd grid G 3, the 4th grid G 4, the 5th grid G 5, the 6th grid G 6With radome 12, be stacked in succession on the glass tube base 11b that stem stem pin 11a is housed with predetermined size, and supported and fix by the glass supporter 10a of multiple style.
In the present embodiment, the 4th grid G 4(5) and the 6th grid G 6(7) connect to be electrically connected, and added 25 kilovolts anode voltage thereon.The 3rd grid G 3(4) and the 5th grid G 5(6) connect to be electrically connected, and added the big or small focus voltage that equals this anode voltage 33% thereon.
In addition, the flat appearance profile of electric field correction electrode 6A in the present embodiment or 7A basically with the profile phase in the grid cross section of the plane institute parting of this correcting electrode insertion portion with.
The two all was equipped with the situation of electric field correction electrode though the above embodiments once referred to the 5th grid 6 and the 6th grid 7, and the present invention is not limited to this allocation plan, but can in the 5th grid 6 electric field correction electrode be set at least.More particularly, under the situation among this correcting electrode is arranged on the 6th grid 7, because radome places the leading section of the 6th grid, promptly in phosphor screen one side, so can not focus on the adjustment on a large scale at angle.If this correcting electrode is placed among the 5th grid 6, then just can obtain the adjustment on a large scale at this focusing angle, thereby can determine to focus on the bigger part at angle.When also correcting electrode being set in the 6th grid 7, then electron beam focusing angle is also adjusted at this focusing angle of fine tuning as required just becomes possibility.But, even only in the 6th grid 7, be provided with under the situation of described electric field correction electrode, also can produce the effect of this degree.
Though the foregoing description once referred to be made into the situation of flat electrode by this electric field correction electrode, and the present invention is not limited thereto.Much less, even this correcting electrode constitutes the cup-shape electrode that has garden post part, also can reach effect similar to the above.
Electron gun of the present invention can adopt has described garden post part, and an end face of this garden post part tilts, the structure of this prior art electron gun, just this electric field correction electrode is placed among the 5th grid, or these electric field correction electrodes not only place the 5th grid but also place among the 6th grid.
As mentioned above, according to the present invention, electric field correction electrode places among the existing grid of a garden post part with inclined end face, focusing angle that whereby can controlling electron beam.Therefore, the present invention and various existing drain junctions with maximum focusing force and typical sizes just can produce fabulous effect altogether, make focusing performance improve and make the chromoscope of all electrode pair various sizes all can be general.

Claims (8)

1, a kind of electron gun of chromoscope, it has makes at least two electron beams along fluoroscopic first electrode assembly of original route directive parallel to each other, with be that described each electron beam path forms basically independently main lens, so that each electron beam focuses on second electrode assembly on the predetermined surface, wherein, each is relatively arranged described first and second electrode assemblies and wherein each all has the grid with the aperture of the concentricity line of described electron beam path to be constituted with a determining deviation by several, and wherein a garden post end face partly of at least one grid tilts with respect to center line; It is characterized in that, in the grid of at least one described garden post part with band inclined end face an electric field correction electrode is set therein.
2, electron gun of colour display tube according to claim 1 is characterised in that wherein said electric field correction electrode is arranged on this inclined end face side of described grid.
3, electron gun of colour display tube according to claim 1, be characterised in that wherein a radome places described these grids the most described fluorescent screen side of close fluoroscopic that grid, described electric field correction electrode then place come with described fluorescence screen side opposite side on described grid among.
4, electron gun of colour display tube according to claim 1, be characterised in that distance between the described garden post part of wherein said electric field correction electrode and described grid is configured to so that the straightline propagation electron beam at the focus point on the described predetermined surface with penetrate the distance of electron beam between the focus point on the described predetermined surface partially and can be needed value.
5,, be characterised in that wherein said predetermined surface is described phosphor screen according to the described electron gun of colour display tube of claim 1.
6, the electron gun of chromoscope according to claim 1 is characterised in that wherein said electric field correction electrode is the planar electrode that has described electron beam aperture.
7, the electron gun of chromoscope according to claim 6 is characterised in that wherein the appearance profile of tabular electric field correction electrode is identical at the cross section profile of the Embedded Division office of described correcting electrode with described grid basically.
8, the electron gun of chromoscope according to claim 1 is characterised in that wherein said electric field correction electrode is connected with respective gates with electric connecting mode.
CN88101547A 1987-03-20 1988-03-19 Electron gun for colour display tube Expired CN1008312B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP63788/87 1987-03-20
JP62063788A JPS63231845A (en) 1987-03-20 1987-03-20 Electron gun for color cathode-ray tube

Publications (2)

Publication Number Publication Date
CN88101547A CN88101547A (en) 1988-09-28
CN1008312B true CN1008312B (en) 1990-06-06

Family

ID=13239463

Family Applications (1)

Application Number Title Priority Date Filing Date
CN88101547A Expired CN1008312B (en) 1987-03-20 1988-03-19 Electron gun for colour display tube

Country Status (4)

Country Link
EP (1) EP0283190A3 (en)
JP (1) JPS63231845A (en)
KR (1) KR910001870B1 (en)
CN (1) CN1008312B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1052763C (en) * 1995-11-15 2000-05-24 首钢总公司 Si Series corrosion inhibitor for soft water close circulation cooling system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100504527B1 (en) * 1998-11-18 2005-09-26 엘지전자 주식회사 Electron gun for colored cathode ray tube

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3011090A (en) * 1952-06-24 1961-11-28 Rca Corp Plural beam tube
JPS5763750A (en) * 1980-10-03 1982-04-17 Hitachi Ltd Control picture tube electron gun
JPS61124037A (en) * 1984-11-21 1986-06-11 Hitachi Ltd Electron gun for color picture tube

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1052763C (en) * 1995-11-15 2000-05-24 首钢总公司 Si Series corrosion inhibitor for soft water close circulation cooling system

Also Published As

Publication number Publication date
EP0283190A3 (en) 1989-07-12
EP0283190A2 (en) 1988-09-21
CN88101547A (en) 1988-09-28
KR910001870B1 (en) 1991-03-28
JPS63231845A (en) 1988-09-27
KR880011862A (en) 1988-10-31

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