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CN1116360A - cathode ray tube and electron gun - Google Patents

cathode ray tube and electron gun Download PDF

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Publication number
CN1116360A
CN1116360A CN95102858A CN95102858A CN1116360A CN 1116360 A CN1116360 A CN 1116360A CN 95102858 A CN95102858 A CN 95102858A CN 95102858 A CN95102858 A CN 95102858A CN 1116360 A CN1116360 A CN 1116360A
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China
Prior art keywords
focusing
electrode
scanning direction
pole
electron beam
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CN95102858A
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Chinese (zh)
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山根久和
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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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
    • H01J29/46—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
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/48—Electron guns
    • H01J2229/4803—Electrodes
    • H01J2229/481—Focusing electrodes
    • 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
    • H01J2229/4803—Electrodes
    • H01J2229/4817—Accelerating electrodes

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  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)

Abstract

An electron gun of a multi-stage convergence type includes a plurality of focusing electrodes, wherein a quadrupole lens nearest to a cathode has a diverging function in the horizontal scanning direction and a converging function in the vertical scanning direction, and a quadrupole lens in the next stage has a converging function in the horizontal scanning direction and a diverging function in the vertical scanning direction. In this structure, even when a voltage synchronized with a deflection current is superposed on a constant focus voltage, applied to the focusing electrode, the operation of the quadrupole lenses is not influenced significantly.

Description

Cathode ray tube and electron gun
The present invention relates to a kind of cathode ray tube, in this pipe, be deflected, on phosphor screen, project image by electron gun electrons emitted bundle.The invention still further relates to electron gun for cathode ray tube.
Fig. 1 is the schematic cross sectional views of the conventional color cathode ray tube of band electron gun.The glass shell of conventional cathode ray tube shape is arranged with reference to digital 31 representatives among the figure, and it comprises neck 32, pars infundibularis 33 and screen dish portion 34.Electron gun 24 is arranged in the neck 32 of glass shell 31.The red, green and blue fluorescent material is applied to the form of inlaying on the inner surface of panel 27 of screen dish 34 to form fluorescence coating 26.With so that the inner conductive film 23 of high pressure conduction be formed on the inner surface of pars infundibularis 33.Deflecting coil 22 is installed around the joint between pars infundibularis 33 and the neck 32, in order to deflection electron gun 24 electrons emitted bundles.
Electron gun 24 comprises: the negative electrode 1 of emitting electrons; The control utmost point 2 in order to control cathode 1 electrons emitted Shu Hangcheng; Intensifying ring 3 in order to accelerated electron beam; Focusing electrode 35 in order to focused beam; With post-accelerating electrode 8 in order to last accelerated electron beam.Be welded to these post-accelerating electrode 8 conductivity shading ring 36, and add high pressure via inner conductive film 23 and shielding cup 36 from anode button.Predetermined voltage is added to other electrode (promptly controlling the utmost point 2, intensifying ring 3 and focusing electrode 35) via the bobbin 37 that is arranged on neck 32 ends.Negative electrode 1 is made up of red beam cathode 1a, green beam negative electrode 1b and blue beam negative electrode 1c.
According to the cathode ray tube of such formation, be deflected to be mapped to after coil 22 deflections by electron gun 24 electrons emitted bundles and form visible image on the fluorescence coating 26.
The resolution character of cathode ray tube depends primarily on the diameter and the shape of the electron-beam point of bombardment on fluorescence coating 26.Particularly when the bundle spot diameter reduced and/or restraint the increase of some circularity, resolution improved.The fluorescence coating screen 26 that forms image on it requires the bundle point to be minor diameter and high circularity.
Yet the panel of cathode ray tube (fluorescence coating 26 and panel 27) is normally flat, so electron beam is big more to the scope of all edge run-outs of screen, the stroke of electron beam is long more.Therefore, when control is added to focus voltage on the focusing electrode 35 when reducing screen core electron beam bundle spot diameter and increasing its circularity, will crosses focusing at the electronics of the marginal portion of screen, thereby can not form the electron-beam point of minor diameter.This just causes that resolution descends.
In view of the foregoing, recommended a kind of so-called dynamic focusing system.In this system, be added to the focus voltage on the focusing electrode 35 so that weaken the focussing force of the main electron lens that constitutes by focusing electrode 20 according to the increase of electron beam deflecting degree.Yet this system is not suitable for the automatic converging system in the widely used in recent years I-shaped electron gun, its reason such as following.This in line gun along three electron beams of horizontal linear emission is used automatic converging system, and in this automatic converging system, the horizontal deflection magnetic field distortion becomes similar pincushion, and vertical deflection magnetic field distorts into similar barrel-shaped brokenly.Electron beam by them is compelled to disperse in the horizontal direction, is compelled to assemble in vertical direction, so they form long flat in the horizontal direction.
Therefore, remain on best focus to the electron beam bundle spot diameter in the horizontal direction of platen edge deflection, and became focus state, cause producing the low-light level part, be i.e. so-called " halo " at the bundle spot diameter of vertical direction.In view of this state, used dynamic focusing system, corrected the perpendicular fasciculus spot diameter of crossing under the focus state, having avoided low-light level partly is the generation of halo, reaches best focus.Become and owe focus state but the horizontal beam spot diameter has departed from best focus in the meantime.Thereby the increase of horizontal beam spot diameter, horizontal definition significantly weakens.So the resolution on the screen periphery does not improve.
Fig. 2 be in order to the amplification of the conventional electrical rifle 24 that overcomes the problems referred to above cutaway view, its discloses in Japanese Patent Application Publication No.3-9313 (1991).This electron gun 24 comprises: negative electrode 1a, 1b and 1c; The control utmost point 2; Intensifying ring 3; First auxiliary electrode 4; Second auxiliary electrode 5; First focusing electrode 6; Second focusing electrode 7 and post-accelerating electrode 8; These electrodes are all by above order setting.This conventional electrical rifle is called the biopotential type electron gun.Its structure is with shown in Figure 1 identical except above-mentioned points.
Fig. 3 is the front view of first auxiliary electrode 4.First auxiliary electrode 4 is similar plate, is being provided with circular hole 4a, 4b and 4c with negative electrode 1a, 1b and the corresponding position of 1c.The surface near screen one side of first auxiliary electrode 4 is provided with paired dull and stereotyped 4d, 4e and 4f, and they all are vertically fixed on respectively on the relative both sides of hole 4a, 4b and 4c, and each all has preset thickness, and bigger slightly than the diameter of hole 4a, 4b and 4c.
Fig. 4 is the rearview of seeing from negative electrode 1a, 1b and 1c.This second auxiliary electrode 5 is similar plate, has circular hole 5a, 5b and 5c in the position corresponding with negative electrode 1a, 1b and 1c.Negative electrode 1a, 1b and 1c side at second auxiliary electrode 5 are provided with paired plate 5d, 5e and 5f, and they laterally are fixed on respectively on the relative both sides of hole 5a, 5b and 5c, and each is all big slightly and preset thickness arranged than hole 5a, 5b and 5c.Fluorescence screen side at second auxiliary electrode 5 also is provided with plate 59,5h and 5i equally.
Fig. 5 is the rearview of first focusing electrode 6 seen from negative electrode 1a, 1b and 1c side.This first focusing electrode 6 is a box-shaped.On the surface of negative electrode 1a, the 1b of first focusing electrode 6 and 1c side, have circular hole 6a, 6b and 6c with negative electrode 1a, 1b and the corresponding position of 1c.Be arranged to right plate 6d, 6e and 6f at grade, they are vertically fixed on respectively on the relative both sides of hole 6a, 6b and 6c, and each is all big and preset thickness arranged than the diameter of hole 6a, 6b and 6c.
Fig. 6 is a front view of seeing first focusing electrode 6 from fluorescence screen side.Have square hole 6g, 6h and 6i on the surface of the first focusing electrode fluorescence screen side, the width of each square hole is bigger slightly than the diameter of hole 6a, 6b and 6c, and vertical length is bigger than width.
Fig. 7 is a rearview of seeing second focusing electrode 7 from negative electrode 1a, 1b and 1c side.This second focusing electrode 7 is a box-shaped.Have square hole 7a, 7b and 7c on the surface of negative electrode 1a, the 1b of second focusing electrode 7 and 1c side, the vertical length of each square hole all diameter than hole 6a, 6b and 6c is big slightly, and transverse width is bigger than vertical length.
First auxiliary electrode 4 and first focusing electrode, 6 usefulness connectors are kept same potential and are added with constant focus voltage V FSecond auxiliary electrode 5 and second focusing electrode, 7 usefulness a connector keep same potential, and are added with constant focus voltage V FA voltage is provided for second auxiliary electrode 5 and second focusing electrode 7 in the mode of stack from circuit 9 in addition, this voltage increases synchronously with deflection current when the deflection of electron beam increases.
Below discussion there is the work of the electron gun 24 of this spline structure.
Fig. 8 and Fig. 9 are the cutaway views at electron beam optics stroke of electron beam and electron lens under the situation of all edge run-outs of screen.More particularly, Fig. 8 illustrates the horizontal sectional view of electron beam, and Fig. 9 illustrates its vertical cross-section diagram.In these figure, the crossover position of reference number 10 representatives and the corresponding electron beam of object point.The passage of electron beam when in the figure, numeral 11 is illustrated in maximum outside angle.
To describe the horizontal direction situation now.Pass through concavees lens 12 from object point 10 with angle of divergence θ electrons emitted bundle, it is first quadrupole lens of the horizontal operation that is made of first auxiliary electrode 4, second auxiliary electrode 5 and first focusing electrode 6, convex lens 13, it is second quadrupole lens of the horizontal operation that is made of first focusing electrode 6 and second focusing electrode 7, convex lens 14, it is the main electron lens that is made of second focusing electrode 7 and post-accelerating electrode 8, with concavees lens 15, it is made of the magnetic field (horizontal component) of deflecting coil 22, and said electron beam is with incidence angle θ after passing through these lens HBe incident upon on the screen (fluorescence coating) 26.
Now the situation to relevant vertical direction is described.Pass through convex lens 16 from object point 10 with angle of divergence θ electrons emitted bundle, it is first quadrupole lens of the vertical work that is made of first auxiliary electrode 4, second auxiliary electrode 5 and first focusing electrode 6, concavees lens 17, it is second quadrupole lens of the vertical work that is made of first focusing electrode 6 and second focusing electrode 7, convex lens 14, it is the main electron lens that is made of second focusing electrode 7 and post-accelerating electrode 8, with convex lens 18, it is made of the magnetic field (vertical component) of deflecting coil 22, after passing through these lens, said electron beam is with incidence angle θ VProject on the screen (fluorescence coating) 26.
Proofread and correct the irregular magnetic field that produces by deflecting coil 22 with first quadrupole lens (12 and 16), second quadrupole lens (13 and 17) and main electron lens 14, so at the screen peripheral part, on level and vertical both direction, electronics can both obtain best focus.Because the effect of first quadrupole lens (12 and 16), electron beam can form the incidence angle θ that equates in shield relative with vertical direction of level in fact HAnd θ VAs a result, the circularity of electron beam bundle point switch is improved.
Above-mentioned biopotential type electron gun structure is simple, but does not have pre-convergent lens, so the beam diameter that is incident on the main electron lens is big.Because the beam diameter that is incident on the main electron lens is proportional to the amount (electric current) of electron beam, big diameter is arranged so scan the electron beam in peripheral brightness increase district (being high luminance area).When beam diameter is big as described above,, the influence of main electron lens spherical aberration degenerates because making to focus on.
The problems referred to above can overcome with multistage convergence type electron gun, and as shown in figure 10, wherein first attachment lens 20 and second attachment lens 21 are arranged between the intensifying ring 3 and first auxiliary electrode 4, in order to assemble electron beam in advance.Yet this can make structure become very complicated.
The present invention has worked out the method that overcomes the problems referred to above, main purpose of the present invention provides a kind of cathode ray tube and the used electron gun of cathode ray tube, wherein be provided with attachment lens and multistage quadrupole lens, to form the structure of multistage convergence type, so can on whole screen, form the image of high definition.
In according to cathode ray tube of the present invention and electron gun, the lensing of multistage quadrupole lens is different at horizontal scan direction and vertical scanning direction.Therefore, electron beam can be corrected respectively in the expansion (angle of divergence) of horizontal scan direction and vertical scanning direction.
In according to cathode ray tube of the present invention and electron gun, the quadrupole lens of close cathode side has disperse function in the horizontal direction in multistage quadrupole lens, at vertical scanning direction converging action is arranged.The next stage quadrupole lens has converging action at vertical scanning direction disperse function to be arranged in the horizontal direction.Therefore, the shape of electron beam can be proofreaied and correct in this manner, promptly can avoid because of focusing on excessively that above-mentioned automatic converging system causes at vertical scanning direction.
In according to cathode ray tube of the present invention and electron gun, above-mentioned multistage quadrupole lens has a kind of like this configuration, and promptly the upper level (cathode side) at first focusing electrode is provided with one the 3rd focusing electrode, and still has second focusing electrode routinely.Each of these electrodes all has circular electron beam through-hole, and following optional structure can be arranged.That is to say that on the surface of the first focusing electrode side of the 3rd focusing electrode, the relative edge of the horizontal direction of its electron beam through-hole is provided with flat board; The relative edge of the vertical direction of its electron beam through-hole is provided with flat board on the surface of the 3rd focusing electrode side of first focusing electrode.The long non-circular electron beam through-hole of vertical scanning direction is set on the surface of the first focusing electrode side of the 3rd focusing electrode, on the surface of the 3rd focusing electrode side of first focusing electrode, the long non-circular electron beam through-hole of horizontal scan direction is set.Because such structure, the quadrupole lens of close cathode side can have disperse function in horizontal scan direction, at vertical scanning direction converging action can be arranged.In addition, the next stage quadrupole lens can have converging action in horizontal scan direction, at vertical scanning direction disperse function can be arranged.
In above-mentioned any structure, constant focus voltage is added to first focusing electrode, the voltage that is made of constant focus voltage and the voltage on it of being added to is added to the second and the 3rd focusing electrode, and this voltage and deflection current that is superimposed upon on the constant focus voltage is synchronous, and increases with the increase of deflection.Therefore, the electric field of the crossover position of electron beam and intensifying ring generation keeps clear of mutually.Even when being added on the focusing electrode with the synchronous voltage of deflection current, the effect of quadrupole lens is also unaffected therefore.And the diameter of place, screen limit electron-beam point is reduced.
By following detailed description with reference to accompanying drawing, above-mentioned purpose and the feature with other of the present invention will be more obvious.
Fig. 1 is the schematic cross sectional views of the conventional cathode ray tube of expression band electron gun;
Fig. 2 be the conventional electrical rifle amplification cutaway view;
Fig. 3 is the front view of first auxiliary electrode;
Fig. 4 is the rearview of second auxiliary electrode;
Fig. 5 is the rearview of first focusing electrode seen from cathode side;
Fig. 6 is a front view of seeing first focusing electrode from fluorescence screen side;
Fig. 7 is a rearview of seeing second focusing electrode from cathode side;
Fig. 8 illustrate electron beam to the screen all edge run-outs situation under transverse sectional view and the work of electron lens;
Fig. 9 illustrate electron beam to the screen all edge run-outs situation under longitudinal sectional view and the work of electron lens;
Figure 10 illustrates the schematic cross sectional views of multistage convergence type conventional electrical rifle structure;
Figure 11 illustrates the cutaway view of electron gun of the present invention;
Figure 12 illustrates the front view of the post-accelerating electrode side (fluorescence screen side) of the 3rd focusing electrode;
Figure 13 illustrates the rearview of the cathode side of first focusing electrode;
Figure 14 illustrate electron beam to screen during all edge run-outs cutaway view and the work of electron lens;
Figure 15 illustrate electron beam to screen during all edge run-outs cutaway view and the work of electron lens;
Figure 16 illustrates the electron gun electrodes of another embodiment of the present invention;
Figure 17 illustrates the electron gun electrodes of another embodiment of the present invention; With
Figure 18 illustrates the electron gun electrodes of another embodiment of the present invention.
Embodiments of the invention are described below with reference to accompanying drawings.
Embodiment 1 will make an explanation below.
Figure 11 is the cutaway view of expression colour cathode-ray tube electron gun of the present invention.This electron gun has the structure of multistage convergence type, and it comprises: respectively in order to launch negative electrode 1a, 1b and the 1c of red, green and blue electron beam; The control utmost point 2 in order to control cathode 1a, 1b and 1c electrons emitted beam passage; Intensifying ring 3 in order to accelerated electron beam; The first attachment lens utmost point 20; Second attachment lens 21; The 3rd focusing electrode 30; First focusing electrode 6; Second focusing 7 and the post-accelerating electrode 8, said these electrodes are all pressed this order setting.Intensifying ring 3 adds identical voltage with second attachment lens 21, and the first attachment lens electrode 20 and first focusing electrode 6 add constant focus voltage V FSecond focusing electrode 7 and the 3rd focusing electrode 30 add constant focus voltage V F, circuit 9 is also at this focus voltage V FLast stack one and deflection current are synchronously and the voltage that increases with the deflection of electron beam.
First attachment lens 20 is and the similar flat box-shaped of conventional electrodes, and its screen side (the second attachment lens electrode, 21 sides) surface is provided with the hole on it, and the hole of these boring ratios on its negative electrode 1a, 1b and 1c side surface is big.The second attachment lens electrode 21 is plate shaped, and it is provided with the hole, and the size in the hole on the screen side surface of the size in hole and the first attachment lens electrode 20 is similar.
Figure 12 illustrates post-accelerating electrode 8 sides (at fluorescence screen side) of the 3rd focusing electrode 30, and said the 3rd focusing electrode 30 is in order to replace first and second auxiliary electrodes 4 and 5 in the prior art shown in Figure 10.This 3rd focusing electrode 30 is plate shaped, is provided with circular hole 30a, 30b and 30c with negative electrode 1a, 1b and 1c corresponding position on it, and the size in the hole on its size and second attachment lens 21 is similar.Be respectively arranged with paired plate 30d, 30e and 30f on the horizontal relative both sides of hole 30a, 30b on the front surface of the 3rd focusing electrode 30 and 30c, its width is a bit larger tham the diameter of hole 30a, 30b and 30c.
Figure 13 is negative electrode 1a, the 1b of first focusing electrode 6 and the rearview of 1c side.First focusing electrode 6 is similar box-shaped, is provided with circular hole 6a, 6b and 6c at negative electrode 1a, the 1b of first focusing electrode 6 and lip-deep and negative electrode 1a, 1b and the corresponding position of 1c of 1c side.Be respectively arranged with paired dull and stereotyped 6d, 6e and 6f on the vertical relative both sides of same lip-deep hole 6a, 6b and 6c, they are bigger slightly and preset thickness arranged than the diameter of hole 6a, 6b and 6c.
The surface of post-accelerating electrode 8 sides (fluorescence screen side) of first focusing electrode 6 is provided with square hole 6g, 6h and the 6i of vertical length, and the width of each square hole is all similar to the diameter of hole 6a, 6b and 6c.
Second focusing electrode 7 is similar box-shaped.Negative electrode 1a, the 1b of second focusing electrode 7 and the surface of 1c side are provided with square hole 7a, 7b and the 7c of horizontal length, and the longitudinal length of each square hole all diameter than hole 6a, 6b and 6c is big slightly.
According to the electron gun of such formation, it is quickened with above-mentioned each electrode by negative electrode 1a, 1b and 1c electrons emitted bundle and assembles, and the directive fluorescence coating.The focussing force of each electrode will be described below.
Figure 14 and 15 each all be illustrated in electron beam to the sectional view of screen electron beam during all edge run-outs and the work of electron lens.Figure 14 is the cross-sectional view of electron beam, and Figure 15 is the longitudinal section of electron beam.In these figure, the crossover position of reference number 10 representatives and the corresponding electron beam of object point, the passage of numeral 11 representatives electron beam when maximum exterior angle.
Now that explanation is relevant with horizontal direction situation.The electron beam of dispersing with angle of divergence θ from object point 10 is by convex lens 40, and it is the attachment lens of the horizontal direction work that is made of the first attachment lens electrode 20, the second attachment lens electrode 21 and the 3rd focus electrode 30; Concavees lens 12, it is first quadrupole lens of the horizontal direction work that is made of the 3rd focusing electrode 30 and first focusing electrode 6; Convex lens 13, it is second quadrupole lens of the horizontal direction work that is made of first and second focusing electrodes 6 and 7; Convex lens 14, it is the main electron lens that is made of second focusing electrode 7 and post-accelerating electrode 8; With concavees lens 15 (see figure 1)s that horizontal component by the magnetic field of deflecting coil 22 constitutes, after these lens, electron beam is with incidence angle θ HBe incident upon on the screen 26.
Now that explanation is relevant with vertical direction situation.The electron beam of dispersing from object point 10 from angle of divergence θ is by convex lens 40, and it is the attachment lens of the vertical direction work that is made of the first attachment lens electrode 20, the second attachment lens electrode 21 and the 3rd focusing electrode 30; Convex lens 16, it is first quadrupole lens of the vertical direction work that is made of the 3rd focusing electrode 30 and first focusing electrode 6; Concavees lens 17, it is second quadrupole lens of the vertical direction work that is made of first and second focusing electrodes 6 and 7; Convex lens 14, it is the main electron lens that is made of second focusing electrode 7 and post-accelerating electrode 8; Convex lens 18 (see figure 1)s that constitute with vertical component by the magnetic field of deflecting coil 22; After passing through these lens, electron beam is with incidence angle θ VOn the screen 26 of projection.
Though the effect of quadrupole lens of the present invention than conventional quadrupole lens slightly a little less than, the length that this defective can increase dull and stereotyped 6d, 6e, 6f, 30d, 30e and 30f by the direction of advancing along electron beam overcomes.
With comprise four electrodes, promptly two focusing electrodes are compared with the electron gun of the routine of two auxiliary electrodes, electron gun of the present invention has and comprises the i.e. simple structure of three focusing electrodes of three electrodes, and it can reduce the diameter of the electron-beam point on the screen periphery and can improve its circularity.Thereby on whole screen, can both obtain high definition.
Distinguished feature of the present invention is the structure that it can simplify the electron gun of using multistage focusing electrode.In structure shown in Figure 11, when electron gun is that the 3rd focusing electrode 30 was relative with intensifying ring 3 when the biopotential type of first and second attachment lenses 20 and 21 was not set.Near the crossover position of the very close electron beam of the electric field that produces the intensifying ring 3, thereby the bundle dot characteristics of electron beam is had a strong impact on.Therefore, near the electric field stack on the 3rd focusing electrode 30 and the synchronous voltage of deflecting voltage directly influence intensifying ring 3 brings the characteristic of electron-beam point to have a strong impact on.Just can not obtain high definition in this case.
Simultaneously, in the embodiment shown in fig. 11, even on being superimposed upon constant focus voltage, be added to the 3rd when focusing on the electrode 30 with the synchronous voltage of deflection current, because the hole on the 3rd hole 30a, 30b, 30c and two attachment lenses 21 that focus on the electrode 30 is enough big, the electric field of setting up between second attachment lens 21 and the 3rd focusing electrode 30 is also constant.In addition, the 3rd focusing electrode 30 is enough far away apart from electron beam crossover position, so it influences the bundle dot characteristics of electron beam hardly.Therefore, the present invention can use multistage focusing electrode.Compared with the prior art the effect of convex lens 40 increases, and these convex lens 40 can reduce the spherical aberration of main electron lens at high luminance area.Therefore can prevent to degenerate in high luminance area focusing.
Embodiment 2 will make an explanation below.
Figure 16,17 and 18 illustrates the electrode of the electron gun of another embodiment of the present invention.Figure 16 is the cutaway view of the major part of the 3rd focusing electrode 30 and first focusing electrode 6.Figure 17 is the front view of the 3rd focusing electrode 30.Figure 18 is the rearview of first focusing electrode 6.In this embodiment, the 3rd focusing electrode 30 shown in Figure 11 and 12 and first focusing electrode, 6 usefulness have the 3rd focusing electrode 30 of following structure and first focusing electrode 6 to replace.This plate shape the 3rd focusing electrode 30 in its negative electrode 1a, 1b and 1c side along half part of thickness direction with quadrat method circular hole 30a, 30b and 30c to be set with the foregoing description, and vertical direction long square hole 30g, 30h and 30i are set on its second half part, the width of each square hole is all similar to the diameter of hole 30a, 30b and 30c.Square hole 6j, 6k and the 6l of horizontal length are set on the surface of negative electrode 1a, the 1b of first focusing electrode 6 and 1c side, and the longitudinal length of each square hole all diameter with hole 30a, 30b and 30c is close.
By being sized to suitable numerical value, hole 30a, 30b, 30c, 6j, 6k and 6l can reach effect similar to Example 1.This embodiment 2 has the characteristics that make designs simplification.
In cathode ray tube of the present invention and electron gun, as mentioned above, multistage convergence type electron gun comprises a plurality of focusing electrodes, the quadrupole lens of close negative electrode has disperse function at vertical scanning direction converging action to be arranged in horizontal scan direction, next stage quadrupole lens mirror has converging action in horizontal scan direction, at vertical scanning direction disperse function is arranged.In this structure, on being superimposed upon constant focus voltage and when being added on the focusing electrode with the synchronous voltage of deflection current, the effect of quadrupole lens is not subjected to too much influence.Therefore, use, just can reduce the diameter of the electron-beam point on the screen periphery and improve its circularity than the simpler structure of prior art.
The present invention can not exceed the spiritual scope of inner characteristic of the present invention with several forms enforcements, present embodiment is to illustrate rather than limitation of the invention, because scope of the present invention is to be defined rather than according to before this explanation by appended claim, all should be within the scope of the claims so drop on that the border of claim and all changes in the scope or its equivalence cooperate.

Claims (12)

1、一种阴极射线管包括：1. A cathode ray tube comprising: 一有颈部、漏斗部和屏盘的外壳；a shell having a neck, a funnel and a panel; 一设置在所述颈部的阴极；a cathode disposed on said neck; 一形成在所述屏盘上的荧光层；a phosphor layer formed on the panel; 一用以控制由所述阴极发射的电子束的通道的控制极；和a gate for controlling the passage of electron beams emitted by said cathode; and 一辅助透镜和多个聚焦极，用以将电子束聚焦在所述荧光层上，所述电子束的通道由所述控制极控制，其特征在于：An auxiliary lens and a plurality of focusing poles are used to focus the electron beam on the fluorescent layer, and the passage of the electron beam is controlled by the control pole, which is characterized in that: 所述多个聚焦极形成多级的四极透镜，所述多级四极透镜在水平扫描方向和垂直扫描方向有不同的透镜功能。The multiple focusing electrodes form a multi-stage quadrupole lens, and the multi-stage quadrupole lens has different lens functions in the horizontal scanning direction and the vertical scanning direction. 2、按照权利要求1所述阴极射线管，其特征在于在所述多级四极透镜中，最靠近所述阴极侧的四极透镜在水平扫描方向有发散作用，在垂直扫描方向有会聚作用，下一级四极透镜在水平扫描方向有会聚作用，在垂直扫描方向有发散作用。2. The cathode ray tube according to claim 1, wherein among the multi-stage quadrupole lenses, the quadrupole lens closest to the cathode side has a diverging effect in the horizontal scanning direction and a converging effect in the vertical scanning direction , the next quadrupole lens has a converging effect in the horizontal scanning direction and a diverging effect in the vertical scanning direction. 3、按照权利要求2所述阴极射线管，其特征在于所述多级四极透镜由从阴极侧按此顺序设置的一第三聚焦极、一第一聚焦极和一第二聚焦极构成，每个电极都有圆形电子束通过孔；在所述第三聚焦极的所述第一聚焦极侧的表面上相对于所述电子束通过孔水平扫描方向在相对两边设置有平板，在所述第一聚焦极的所述第三聚焦极侧的表面上相对于所述圆形电子束通过孔的垂直扫描方向在相对两边上设置有平板。3. The cathode ray tube according to claim 2, wherein said multi-level quadrupole lens is composed of a third focusing electrode, a first focusing electrode and a second focusing electrode arranged in this order from the cathode side, Each electrode has a circular electron beam passing hole; on the surface of the first focusing pole side of the third focusing pole, flat plates are arranged on opposite sides relative to the horizontal scanning direction of the electron beam passing hole, and on the surface of the third focusing pole The surface of the first focusing electrode on the side of the third focusing electrode is provided with flat plates on two opposite sides with respect to the vertical scanning direction of the circular electron beam passing hole. 4、按照权利要求2所述阴极射线管，其特征在于所述多级四极透镜由从阴极侧按此顺序设置的一第三聚焦极、一第一聚焦极和一第二聚焦极构成，每个电极都有电子束通过孔，在所述第三聚焦极的第一聚焦极侧的表面上设置有沿垂直扫描方向伸长的非圆形电子束通过孔，在所说的第一聚焦极的第三聚焦极侧的表面上设置有沿水平扫描方向伸长的非圆形电子束通过孔。4. The cathode ray tube according to claim 2, wherein said multi-stage quadrupole lens is composed of a third focusing electrode, a first focusing electrode and a second focusing electrode arranged in this order from the cathode side, Each electrode has an electron beam passing hole, and a non-circular electron beam passing hole elongated along the vertical scanning direction is arranged on the surface of the first focusing pole side of the third focusing pole. A non-circular electron beam passing hole elongated along the horizontal scanning direction is arranged on the surface of the third focusing pole side of the pole. 5、按照权利要求3所述阴极射线管，其特征在于恒定聚焦电压加到所述第一聚焦极，由在一恒定聚焦电压上叠加上另一电压构成的电压加到所述第二和第三聚焦极上，所叠加的另一电压与偏转电流同步并随偏转度的增加而增加。5. A cathode ray tube according to claim 3, wherein a constant focus voltage is applied to said first focus electrode, and a voltage constituted by superimposing another voltage on a constant focus voltage is applied to said second and second focus electrodes. On the three focusing poles, another superimposed voltage is synchronized with the deflection current and increases with the increase of the deflection degree. 6、按照权利要求4所述阴极射线管，其特征在于将恒定聚焦电压加到所述第一聚焦极，在一恒定聚焦电压上叠加上另一电压构成的电压加到所述第二和第三聚焦极上，所叠加的另一电压与偏转电流同步并随偏转度的增加而增加。6. The cathode ray tube according to claim 4, wherein a constant focus voltage is applied to said first focus electrode, and a voltage formed by superimposing another voltage on a constant focus voltage is applied to said second and second electrodes. On the three focusing poles, another superimposed voltage is synchronized with the deflection current and increases with the increase of the deflection degree. 7、一种电子枪包括：7. An electron gun comprising: 一阴极；a cathode; 一用以控制由所述阴极发射的电子束的通道的控制极；和a gate for controlling the passage of electron beams emitted by said cathode; and 一辅助透镜和多个聚焦极，用以聚焦电子束，电子束的通道用所述控制极控制；其特征在于：An auxiliary lens and a plurality of focusing poles are used to focus the electron beam, and the passage of the electron beam is controlled by the control pole; it is characterized in that: 所述多个聚焦极形成多级四极透镜，所述多级四极透镜在水平扫描方向和垂直扫描方向有不同的透镜功能。The plurality of focusing electrodes form a multi-stage quadrupole lens, and the multi-stage quadrupole lens has different lens functions in the horizontal scanning direction and the vertical scanning direction. 8、按照权利要求7所说的电子枪，其特征在于在所述多级四极透镜中，最靠近所述阴极的四极透镜在水平扫描方向有发散作用，在垂直扫描方向有会聚作用，下一级四极透镜在水平扫描方向有会聚作用。在垂直扫描方向有发散作用。8. The electron gun according to claim 7, characterized in that among the multi-level quadrupole lenses, the quadrupole lens closest to the cathode has a diverging effect in the horizontal scanning direction and a converging effect in the vertical scanning direction. The primary quadrupole lens has a converging effect in the horizontal scanning direction. There is divergence in the vertical scanning direction. 9、按照权利要求8所述电子枪，其特征在于所述多级四极透镜由从阴极侧依次由一第三聚焦极、一第一聚焦极和一第二聚焦极构成，每极都有一圆形电子束通过孔；在所述第三聚焦极的第一聚焦极侧的表面上，相对于所述电子束通过孔的水平扫描方向，在相对两边上设置有平板，在所述第一聚焦极的第三聚焦极侧的表面上，相对于所述圆形电子束通过孔的垂直扫描方向，在两相对边上设置有平板。9. The electron gun according to claim 8, wherein said multi-level quadrupole lens is composed of a third focusing pole, a first focusing pole and a second focusing pole in sequence from the cathode side, and each pole has a circle Shaped electron beam passing hole; on the surface of the first focusing pole side of the third focusing pole, with respect to the horizontal scanning direction of the electron beam passing hole, flat plates are arranged on the opposite sides, and on the first focusing pole On the surface of the third focusing pole side of the pole, flat plates are arranged on two opposite sides with respect to the vertical scanning direction of the circular electron beam passing hole. 10、按照权利要求8所述电子枪，其特征在于所述多级四极透镜由从阴极侧依次由一第三聚焦极、一第一聚焦极和一第二聚焦极构成，每极都有一电子束通过孔，在所述第三聚焦极的第一聚焦极侧的表面上设置有沿垂直扫描方向伸长的一非圆形电子束通过孔，在所述第一聚焦电极的第三聚焦极侧的表面上设置有沿水平扫描方向伸长的一非圆形电子束通过孔。10. According to the described electron gun of claim 8, it is characterized in that said multi-stage quadrupole lens is composed of a third focusing pole, a first focusing pole and a second focusing pole in sequence from the cathode side, and each pole has an electron A beam passing hole, a non-circular electron beam passing hole elongated along the vertical scanning direction is provided on the surface of the first focusing electrode side of the third focusing electrode, and the third focusing electrode of the first focusing electrode A non-circular electron beam passing hole elongated along the horizontal scanning direction is provided on the side surface. 11、按照权利要求9所述电子枪，其特征在于将恒定聚焦电压加到所述第一聚焦极上，将在恒定聚焦电压上叠加上另一电压构成的电压加到所述第二和第三聚焦极上，所叠加的另一电压与偏转电流同步并随偏转度的增加而增加。11. The electron gun according to claim 9, wherein a constant focus voltage is applied to said first focus electrode, and a voltage formed by superimposing another voltage on the constant focus voltage is applied to said second and third electrodes. On the focusing pole, another voltage superimposed is synchronized with the deflection current and increases with the increase of the deflection degree. 12、按照权利要求10所述电子枪，其特征在于将恒定聚焦电压加到所述第一聚焦极上，将在恒定聚焦电压上叠加上另一电压构成的电压加到所述第二和第三聚焦极上，所叠加的另一电压与偏转电流同步并随偏转度的增加而增加。12. The electron gun according to claim 10, wherein a constant focus voltage is applied to said first focus electrode, and a voltage formed by superimposing another voltage on the constant focus voltage is applied to said second and third electrodes. On the focusing pole, another voltage superimposed is synchronized with the deflection current and increases with the increase of the deflection degree.
CN95102858A 1990-01-12 1995-03-14 cathode ray tube and electron gun Pending CN1116360A (en)

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JP2005175A JPH03210736A (en) 1990-01-12 1990-01-12 Electron gun for cathode-ray tube
JP6055689A JPH07262935A (en) 1990-01-12 1994-03-25 Cathode-ray tube and electron gun
JP055689/94 1994-03-25

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US7148614B2 (en) 2003-02-24 2006-12-12 Lg. Philips Displays Korea Co., Ltd. Electron gun for cathode ray tube

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KR100459155B1 (en) * 1997-05-31 2005-02-28 엘지전자 주식회사 Color Cathode Tube
KR100759544B1 (en) * 2001-09-24 2007-09-18 삼성에스디아이 주식회사 Dual Dynamic Focus Gun

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US7148614B2 (en) 2003-02-24 2006-12-12 Lg. Philips Displays Korea Co., Ltd. Electron gun for cathode ray tube

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