CN1116360A - Cathode-ray tube and electron gun - Google Patents
Cathode-ray tube and electron gun Download PDFInfo
- 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
- Authority
- CN
- China
- Prior art keywords
- focusing electrode
- electron beam
- electrode
- hole
- lens
- 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.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
- H01J29/48—Electron guns
- H01J29/488—Schematic arrangements of the electrodes for beam forming; Place and form of the elecrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- 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
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
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.
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.
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.
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.
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, a kind of cathode ray tube comprises:
One has the shell of neck, pars infundibularis and screen dish;
One is arranged on the negative electrode of described neck;
One is formed on the fluorescence coating on the described screen dish;
One in order to the control utmost point of control by the passage of the electron beam of described cathode emission; With
One attachment lens and a plurality of focusing electrode, in order to electron beam is focused on the described fluorescence coating, the passage of described electron beam is controlled by the described control utmost point, it is characterized in that:
Described a plurality of focusing electrode forms multistage quadrupole lens, and described multistage quadrupole lens has different lens functions at horizontal scan direction and vertical scanning direction.
2, according to the described cathode ray tube of claim 1, it is characterized in that in described multistage quadrupole lens, the quadrupole lens of close described cathode side has disperse function in horizontal scan direction, at vertical scanning direction converging action is arranged, the next stage quadrupole lens has converging action in horizontal scan direction, at vertical scanning direction disperse function is arranged.
3, according to the described cathode ray tube of claim 2, it is characterized in that described multistage quadrupole lens is made of one the 3rd focusing electrode that is provided with in this order from cathode side, one first focusing electrode and one second focusing electrode, each electrode all has circular electron beam to pass through the hole; On the surface of the described first focusing electrode side of described the 3rd focusing electrode, be provided with flat board on both sides relatively, be provided with flat board in both sides relatively with respect to the vertical scanning direction of described circular electron beam by the hole on the surface of described the 3rd focusing electrode side of described first focusing electrode with respect to described electron beam through-hole horizontal scan direction.
4, according to the described cathode ray tube of claim 2, it is characterized in that described multistage quadrupole lens is made of one the 3rd focusing electrode that is provided with in this order from cathode side, one first focusing electrode and one second focusing electrode, each electrode all has electron beam through-hole, the surface of the first focusing electrode side of described the 3rd focusing electrode is provided with along the non-circular electron beam through-hole of vertical scanning direction elongation, and the surface of the 3rd focusing electrode side of said first focusing electrode is provided with along the non-circular electron beam through-hole of horizontal scan direction elongation.
5, according to the described cathode ray tube of claim 3, it is characterized in that constant focus voltage is added to described first focusing electrode, by being added on the described second and the 3rd focusing electrode being superimposed with the voltage that another voltage constitutes on the constant focus voltage, another voltage that is superposeed and deflection current increase synchronously and with the increase of deflection.
6, according to the described cathode ray tube of claim 4, it is characterized in that constant focus voltage is added to described first focusing electrode, be added on the described second and the 3rd focusing electrode being superimposed with the voltage that another voltage constitutes on the constant focus voltage, another voltage that is superposeed and deflection current are synchronous and increase with the increase of deflection.
7, a kind of electron gun comprises:
One negative electrode;
One in order to the control utmost point of control by the passage of the electron beam of described cathode emission; With
One attachment lens and a plurality of focusing electrode, in order to focused beam, the passage of electron beam is controlled with the described control utmost point; It is characterized in that:
Described a plurality of focusing electrode forms multistage quadrupole lens, and described multistage quadrupole lens has different lens functions at horizontal scan direction and vertical scanning direction.
8, according to the said electron gun of claim 7, it is characterized in that in described multistage quadrupole lens, the quadrupole lens of close described negative electrode has disperse function in horizontal scan direction, at vertical scanning direction converging action is arranged, and the next stage quadrupole lens has converging action in horizontal scan direction.At vertical scanning direction disperse function is arranged.
9, according to the described electron gun of claim 8, it is characterized in that described multistage quadrupole lens by constituting by one the 3rd focusing electrode, one first focusing electrode and one second focusing electrode successively from cathode side, every utmost point all has a circular electron beam to pass through the hole; On the surface of the first focusing electrode side of described the 3rd focusing electrode, horizontal scan direction with respect to described electron beam through-hole, both sides are provided with flat board relatively, on the surface of the 3rd focusing electrode side of described first focusing electrode, with respect to the vertical scanning direction of described circular electron beam by the hole, two relative edges are provided with flat board.
10, according to the described electron gun of claim 8, it is characterized in that described multistage quadrupole lens is by being made of one the 3rd focusing electrode, one first focusing electrode and one second focusing electrode successively from cathode side, every utmost point all has an electron beam through-hole, the surface of the first focusing electrode side of described the 3rd focusing electrode is provided with along a non-circular electron beam through-hole of vertical scanning direction elongation, and the surface of the 3rd focusing electrode side of described first focusing electrode is provided with along a non-circular electron beam through-hole of horizontal scan direction elongation.
11, according to the described electron gun of claim 9, it is characterized in that constant focus voltage is added on described first focusing electrode, to be added on the described second and the 3rd focusing electrode being superimposed with the voltage that another voltage constitutes on the constant focus voltage, another voltage that is superposeed and deflection current are synchronous and increase with the increase of deflection.
12, according to the described electron gun of claim 10, it is characterized in that constant focus voltage is added on described first focusing electrode, to be added on the described second and the 3rd focusing electrode being superimposed with the voltage that another voltage constitutes on the constant focus voltage, another voltage that is superposeed and deflection current are synchronous and increase with the increase of deflection.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005175A JPH03210736A (en) | 1990-01-12 | 1990-01-12 | Electron gun for cathode-ray tube |
| JP055689/94 | 1994-03-25 | ||
| JP6055689A JPH07262935A (en) | 1990-01-12 | 1994-03-25 | Cathode-ray tube and electron gun |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1116360A true CN1116360A (en) | 1996-02-07 |
Family
ID=37076165
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95102858A Pending CN1116360A (en) | 1990-01-12 | 1995-03-14 | Cathode-ray tube and electron gun |
Country Status (3)
| Country | Link |
|---|---|
| JP (2) | JPH03210736A (en) |
| KR (1) | KR0169165B1 (en) |
| CN (1) | CN1116360A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7148614B2 (en) | 2003-02-24 | 2006-12-12 | Lg. Philips Displays Korea Co., Ltd. | Electron gun for cathode ray tube |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100459155B1 (en) * | 1997-05-31 | 2005-02-28 | 엘지전자 주식회사 | Color Cathode Tube |
| KR100759544B1 (en) * | 2001-09-24 | 2007-09-18 | 삼성에스디아이 주식회사 | Double dynamic focus electron gun |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4063128A (en) * | 1976-07-02 | 1977-12-13 | Rca Corporation | Cathode support structure for color picture tube guns to equalize cutoff relation during warm-up |
| JPS54160160A (en) * | 1978-06-09 | 1979-12-18 | Hitachi Ltd | Electron gun assembly |
-
1990
- 1990-01-12 JP JP2005175A patent/JPH03210736A/en active Pending
-
1994
- 1994-03-25 JP JP6055689A patent/JPH07262935A/en active Pending
-
1995
- 1995-03-14 CN CN95102858A patent/CN1116360A/en active Pending
- 1995-03-23 KR KR1019950006158A patent/KR0169165B1/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7148614B2 (en) | 2003-02-24 | 2006-12-12 | Lg. Philips Displays Korea Co., Ltd. | Electron gun for cathode ray tube |
Also Published As
| Publication number | Publication date |
|---|---|
| KR0169165B1 (en) | 1999-01-15 |
| JPH03210736A (en) | 1991-09-13 |
| JPH07262935A (en) | 1995-10-13 |
| KR950027893A (en) | 1995-10-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1050439C (en) | Color braun tube apparatus | |
| CN1120729A (en) | Color cathode ray tube having a low dynamic focus voltage | |
| CN1034287A (en) | Colour display tube, deflection system and electron gun | |
| CN1097840C (en) | Dynamic 4 polar electrode system in pre-focusing electrode in electron gun for color cathode ray tube | |
| CN1108427A (en) | Twin-convex electron gun | |
| US3524094A (en) | Wide deflection angle cathode-ray tube with a lens for focussing the electron-beam at an elongate spot on a screen and an astigmatic correcting lens | |
| KR100274880B1 (en) | Dynamic Focus Gun for Color Cathode Ray Tubes | |
| CN1058103C (en) | Color cathode ray tube having improved focus | |
| CN1116360A (en) | Cathode-ray tube and electron gun | |
| CN1011367B (en) | Color picture tube having inline electron gun with einzel lens | |
| CN1114223C (en) | Focusing electrode in electron gun for color cathode ray tube | |
| CN1459818A (en) | Electron gun for cathode-ray tube | |
| KR100334072B1 (en) | electron gun for the cathode ray tube | |
| CN1159748C (en) | Electron gun of CRT | |
| CN1320591C (en) | Color cathode ray tube apparatus | |
| CN1084927C (en) | Electronic gun for color cathode ray tube | |
| CN1130302A (en) | Colour display system by using quadrupole lens | |
| CN100339930C (en) | Colour kinescope | |
| JP3672390B2 (en) | Electron gun for color cathode ray tube | |
| CN1118848C (en) | Color cathode ray tube having improved resolution | |
| CN1248282C (en) | Color picture tube | |
| KR100297697B1 (en) | Electron gun for cathode ray tube | |
| CN1315149C (en) | Indirect-heating electronic gun and its cathode-ray tube | |
| KR100258905B1 (en) | Electron gun for color cathode ray tube | |
| US7122977B2 (en) | Cathode-ray tube apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |