CN1018107B - Electron gun of picture tube - Google Patents
Electron gun of picture tubeInfo
- Publication number
- CN1018107B CN1018107B CN87107267A CN87107267A CN1018107B CN 1018107 B CN1018107 B CN 1018107B CN 87107267 A CN87107267 A CN 87107267A CN 87107267 A CN87107267 A CN 87107267A CN 1018107 B CN1018107 B CN 1018107B
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- China
- Prior art keywords
- electrode
- electron beam
- electron
- added
- electron gun
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- Expired
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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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
- H01J29/48—Electron guns
- H01J29/50—Electron guns two or more guns in a single vacuum space, e.g. for plural-ray tube
- H01J29/503—Three or more guns, the axes of which lay in a common plane
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
- H01J29/48—Electron guns
- H01J29/50—Electron guns two or more guns in a single vacuum space, e.g. for plural-ray tube
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- 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
- H01J29/52—Arrangements for controlling intensity of ray or beam, e.g. for modulation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2229/00—Details of cathode ray tubes or electron beam tubes
- H01J2229/48—Electron guns
- H01J2229/4834—Electrical arrangements coupled to electrodes, e.g. potentials
- H01J2229/4837—Electrical arrangements coupled to electrodes, e.g. potentials characterised by the potentials applied
- H01J2229/4841—Dynamic potentials
Landscapes
- Details Of Television Scanning (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
- Electron Sources, Ion Sources (AREA)
Abstract
An electron beam generator for a colour picture tube has a first group of electrodes for generating electron beams and for directing said beams along a trajectory to a luminescent screen, and a second group of electrodes which forms a main lens and focuses the electron beams on the luminescent screen, the second group of electrodes consisting of a third, fourth, fifth, and sixth electrode which, starting from the first group of electrodes are arranged in series in the direction of the luminescent screen. The fourth electrode consists of a first, a second, and a third element which starting from the first group of electrodes, are arranged in series in the direction of the luminescent screen. The second element has pinhole diaphragms for transmitting the electron beams, the first and the third elements each have pinhole diaphragms for transmitting the electron beams.
Description
The present invention is relevant with picture tube electron gun, and is specifically, relevant with the electrode that forms color picture tube in-line electron gun main lens.
Fig. 2 is the plane graph with color picture tube of conventional electrical rifle, scribbles the panel 2 inwalls supporting of the phosphor screen 3 of three kinds of color fluorophor by glass shell 1 successively.The negative electrode 6 of divergent bundle, each central shaft 17 of 7 and 8,18 and 19 are in line with the respective center axle of the first electrode G1 and the second electrode G2 bore portion respectively, central shaft 17,18 and 19 also with the third electrode G3 that forms main lens, the central shaft in the central shaft in the 4th electrode G4 and the 5th electrode G5 aperture and the aperture of radome 15 is in line, and these three central shafts 17,18 are fully parallel mutually in same plane with 19.The direction of this common plane hereinafter is decided to be horizontal direction.The 6th electrode G6 is last electrode that forms main lens, and the central shaft 9 and 10 extroversions of garden, two outsides tube that extend into the garden tube part of the 6th electrode interior from the aperture part of the 6th electrode depart from corresponding central shaft 17 and 19.
By corresponding negative electrode 6, three electron beams of 7 and 8 emissions are along corresponding central axis 17,18 and 19 project on the main lens, these three central shafts 17,18 and 19 are called the Src Chan of electron beam, in example shown in Figure 1, main lens is combined by two electron lenses, that is to say by third electrode G3, the so-called single-potential focusing electronic lens (UPF lens) that the 4th electrode G4 and the 5th electrode G5 form and combine by the so-called bipotential focused electron lens (BPF lens) that the 5th electrode G5 and the 6th electrode G6 form, the current potential of the current potential of the 6th electrode G6 and radome 15 and the current potential of glass shell 1 internal electrically conductive layer are identical, that is to say, high pressure about 20 to 30 kilovolts is added to above three places, focus voltage about 5 to 9 kilovolts is added on third electrode G3 and the 5th electrode G5, electronegative potential about 400 to 1000 volts is added to the 4th electrode G4, this current potential is substantially identical with current potential on being added in the second electrode G2, project electron beam on the main lens by these two electron lenses (UPF and BPF) lens) focus on, because main lens is axisymmetric to the electron beam (electron beams of central authorities) along central shaft 18 projections, therefore after main lens focused on, central electron beam was straight by the track along central shaft 18.On the other hand, BPF lens in the electron lens that forms main lens ( central shaft 17 and 19 configurations outside the edge, form by the 5th electrode G5 and the 6th electrode G6) in, because the central shaft 9 of the 6th electrode G6 and 10 is outwards eccentric, and electron beam enters the 6th electrode interior along the central shaft of these lens, and the track of electron beam electron beam when focusing on just is partial to central shaft 18 as a result.This electron beam (outer beams) that projects main lens along outer side center axle 17 and 19 focuses on to central electron beam when being focused on by main lens simultaneously.Therefore, these three electron beams form a picture point on shadow mask 4, are focused into to overlap each other.This effect of focused beam is called convergence, and is special, is called static convergence (following will the brief note by abridging is STC) in the convergence partly of picture center.Electron beam carries out colour by shadow mask 4 to be selected, and has only the aperture that can encourage the luminous part of corresponding colour phosphor could pass through shadow mask 4 to arrive phosphor screen 3, and it is contiguous that the outside inclined to one side coil 16 of mangneto is contained in glass shell 1, so that electron beam scans on phosphor screen.
As everyone knows, if can form static convergence in frame central authorities, the convergence of so whole frame picture can be in the in-line electron gun of a horizontal plane with the stroke of three electron beams and the so-called auto-convergence deflecting coil of the non-homogeneous deflecting field of generation is finished.Yet this auto-convergence deflecting coil has a problem, and deflection defocuses too big, and consequently the resolution of the marginal portion of frame is owing to the inhomogeneous of deflecting field reduces.Fig. 3 has schematically represented this phenomenon, and electron-baem spot defocuses and distortion owing to deflection.
In the marginal portion of frame, the hi-lite 31(of the electron beam that hacures are represented nuclear) the along continuous straight runs expansion, low-light level part (haloing) is vertically expansion then.Electron-baem spot is deflection shape in the bight of frame.
A method that overcomes this problem is disclosed in the electron gun that Japan Patent Laid-Open № .74246/19860 Fig. 4 has represented a routine.The 4th electrode G4 is along being divided into three parts from negative electrode 6,7 and 8 to phosphor screen 3 directions, i.e. first member, 121, the second members 122 and the 3rd member 123.The electronegative potential upward identical substantially with being added in the second electrode G2 is added to respectively on first member 121 and the 3rd member 123.The elongated slit-like opening of horizontal direction 12 is arranged on second member 122.Be added on second member 122 with the deflection electric current that is the synchronous current potential that changes of dynamic current that are added on the deflecting coil.If the deflection degree is big, because the potential difference between first member 121 and the 3rd member 123 and second member 122 increases, the nonaxisymmetrical power of a lens that is formed by groove also increases, and consequently the astigmatism of electron-baem spot is also big.If the current potential of second member 122 is higher than the current potential of first member 121 and the current potential of the 3rd member 123, caused astigmatism is nuclear vertical elongated and halo horizontal extension in the electron beam.As a result, the astigmatism as shown in Figure 3 that causes owing to electron beam deflection can access counteracting, thereby has improved the resolution of the edge part of frame.On the other hand, if electron beam is not by deflection, prevent to form asymmetric lens to obtain not produce the condition of astigmatism with the method for eliminating potential difference between first member 121 and the 3rd member 123 and second member 122, can prevent that therefore resolution from reducing at the frame middle body.
In the above-mentioned conventional example, only disclose some electrode and can eliminate the astigmatism that deflection focuses on, do not consider field bend, and field bend another key factor that to be deflection defocus.Because this deflection defocuses, even can focus at electron beam under the condition of frame middle body, in the marginal portion, electron beam has just focused on before arriving screen, therefore electron beam is expanded very greatly on screen, and its result reduces the resolution of color cathode ray tube frame border part.
Therefore, in the conventional example above-mentioned, except adopting dynamic potential generation circuit correct astigmatism,, need to adopt a circuit to change focus voltage at any time to change the magnification ratio of main lens according to electron beam deflection degree for the alignment field bending.Therefore but focus voltage is 5 to 10 kilovolts a high pressure, and will making one, to change the circuit that focus voltage comes the alignment field bending at any time be very difficult.
The purpose of this invention is to provide a kind of electron gun, in this electron gun, a single circuit that produces low relatively dynamic electric voltage can while correct astigmatism and field bend.
For the alignment field bending, when electron beam deflection arrives the frame border part, must improve the current potential of the 4th electrode G4 and reduce by third electrode G3 the UPF power of a lens that the 4th electrode G4 and the 5th electrode G5 form.Correct astigmatism must be divided into the 4th electrode G4 first, second and the 3rd member, and open shape hole, non-garden on second member, and the potential difference between the first and the 3rd member and second member is changed synchronously with the deflection electric current if desired.
In this case, the current potential of second member is changed to constant, and the current potential of the current potential of first member and the 3rd member is a dynamic current potential that changes with the deflection electric current.
In conventional example shown in Figure 4, if the current potential of first member and the 3rd member immobilizes, and improve the current potential of second member, then the effect that improves of current potential is shielded by first member and the 3rd member.As a result, auxometric variable quantity is not sufficient to the alignment field bending.
By open on second member of the 4th electrode G4 hole, non-garden and and the deflection electric current synchronously change the method for the potential difference between first member and the 3rd member and second member, can proofread and correct the astigmatism that produces owing to deflection.In this case, the current potential of second member is changed to fixed value, the current potential that improves first member and the 3rd member when deflection just can reduce power of lens effectively, thereby alignment field bending, because third electrode G3 is directly relative with first member 121, and the 5th electrode G5 is directly relative with the 3rd member 123.
Another object of the present invention provides a kind of structure of electron gun, and the circuit that wherein is used for producing lower dynamic current potential can be realized astigmatic correction and dynamic focusing simultaneously and not have a bit bad influence to assembling.
In order to realize dynamic focusing, when electron beam the time need be improved the current potential of the 4th electrode G4 to the frame border zone by deflection, reduce by the 3rd, the 4th and the 5th electrode G3, the UPF power of a lens that G4 and G5 form, if finish astigmatic correction simultaneously, just need be divided into first member, 121, the second members 122 and the 3rd member 123 to the 4th electrode G4, on second member, open shape hole, non-garden, and make potential difference with first member and the 3rd member with deflection electric current synchronous change.In this case, the structure that effectively realizes dynamic focusing is that the current potential of second member is invariable, and the current potential of first member and the 3rd member then is changed to the dynamic current potential that changes with the deflection electric current.
In order to remove the bad influence to assembling, the hole, non-garden of opening on second member requires to be the elongated slotted hole of vertical direction.Because this structure, if the deflection degree of electron beam is big, the dynamic electric voltage that improves first member and the 3rd member so can reduce the magnification ratio of main lens, thereby can realize dynamic focusing, and also increase simultaneously with the potential difference that is the second member current potential of normal value, the result has eliminated the caused astigmatism of deflection, therefore, can increase astigmatism in the other direction.
The astigmatism that causes by deflection can be used in open the method in shape hole, a non-garden on second member 122 of the 4th electrode G4 and use and deflection electric current synchronous change second member 122 and first member 121 and the 3rd member 123 between the method for potential difference obtain proofreading and correct.In this case, execution control reduction power of lens is that the way of dynamic focusing is to improve the current potential of the first and the 3rd member and the current potential of reduction by second member when deflection, because the third electrode of reference numerals 11 indications is directly relative with first member 121, and the 5th electrode of reference numerals 13 indications is directly relative with the 3rd member 123.On the other hand, in conventional example shown in Figure 4, if the current potential of the first and the 3rd member is constant, and improve the current potential of second member, because the influence that current potential raises is shielded by first member 121 and the 3rd member 123, auxometric variable quantity is not enough to realize effectively dynamic focusing between third electrode G3 and the 5th electrode G5, in this case, such method is worthy of consideration, it is constant that the current potential of second member keeps, but the current potential that reduces by second member according to the deflection degree can produce the effect that strengthens correct astigmatism.
By the hole on second member being made non-garden shape and the method that adds the elongated flute profile aperture of vertical direction, can make convergence avoid the confusion that produces under the elongated flute profile aperture situation of horizontal direction, because vertical slotted hole is not subjected to the influence of adjacent bores.
The present invention not only can be effectively used to color picture tube, equally also can be effectively used to singleguntube.
Fig. 1 (a) is the horizontal cross based on the electron gun of one embodiment of the present of invention;
Fig. 1 (b) is the perspective view of a major part of electron gun shown in Fig. 1 (a);
Fig. 2 is the horizontal cross with color picture tube of conventional electrical rifle;
The schematic diagram of the electron-baem spot that Fig. 3 forms on the screen of color picture tube for the conventional electrical rifle;
Fig. 4 (a) is the horizontal cross of another kind of conventional electrical rifle;
Fig. 4 (b) is the perspective view of a major part of electron gun shown in Fig. 4 (a);
Fig. 5, the electron gun of Fig. 6 and Fig. 9 explanation design and the result that the conventional electrical barotaxis can be analyzed according to the present invention;
Fig. 7,8,10,12,13 and 14 is the structure chart based on other specific implementations of electron gun electrodes of the present invention;
Figure 11 is that illustration is based on the added potential waveform figure of electron gun of the present invention;
Figure 15 (a) is the horizontal cross based on the another kind of embodiment of electron gun of the present invention;
Figure 15 (b) is the perspective view of a major part of electron gun shown in Figure 15 (a);
Figure 16 has shown the measurement result based on electron gun performance of the present invention;
Figure 17 is based on the front view of another specific implementation of electron gun of the present invention and vertical sectional view.
With reference to Fig. 1, describe one embodiment of the present of invention now in detail.One 20 to 30 kilovolts high potential (Eb) is added on the 6th electrode G6 by radome 15.One 5 to 10 kilovolts middle current potential (potential focus Vf) is added on third electrode G3 and the 5th electrode G5, one 100 to 1500 volts electronegative potential is added to and is divided into three members 121,122 ' and 123 the 4th electrode G4 on, third electrode G3, the 4th electrode G4 and the 5th electrode G5 form UPF lens, the 5th electrode G5 and the 6th electrode G6 form BPF lens, and the main lens of being made up of above-mentioned two lens focuses on electron beam.
Second member 122 ' bore portion the groove of longitudinal extension is arranged, second member is in the centre position of three members, current potential is identical with the second electrode G2.A common electric voltage VG
4Be added on first member 121 and the 3rd member 123 that is in second member, 122 ' both sides respectively.Current potential VG
4By being determined with the synchronous dynamic current that changes of deflection electric current.When the deflection electric current big, when the electronic deflection angle is also big, VG
4Value increase, the magnification ratio of the non-axial symmetrical lens that is formed by groove increases, thereby has eliminated the astigmatism that is produced owing to electron beam deflection.
The result of usefulness embodiment illustrated in fig. 1 is analyzed in Fig. 5 explanation with computer.
The size of the electron gun main lens that is used for analyzing is as follows:
Third electrode G3 goes up bore dia (by the second electrode φ 1.5
G2 one side)
Third electrode G3 goes up bore dia (by the 4th
Utmost point G4 one side) φ 4.0
Third electrode length 2.7
The diameter phi 4.0 in hole on three members 123
The length 0.5 of three members 123
The diameter l in hole
1φ 4.0
Groove diameter l
2φ 6.0
Well width W 3.0
Length 0.7
The 5th electrode G5 goes up the diameter in hole (by the 4th
Utmost point G4 one side) φ 4.0
The 5th electrode G5 goes up the diameter in hole (by the 6th
Utmost point G6 one side) φ 8.0
The 5th electrode G5 length 24.3
The 6th electrode G6 goes up the diameter phi 8.0 in hole
(unit: millimeter)
The voltage (Eb) that is added on the 6th electrode G6 is 25 kilovolts, be added in second member 122 of the 4th electrode G4 ' on voltage (identical) with the electrode on being added in the second electrode G2 be 650 volts.Yum cover 4 and the distance between the third electrode G3 of the 4th electrode G4 end points are 340 millimeters, on the electron beam Bei Ju Jiao Zai Yum cover 4.
Change is added in first member 121 of composition the 4th electrode G4 and the dynamic current potential VG on the 3rd member 123
4Horizontal haloing at frame center's zone electron-baem spot is disappeared, with voltage VG this moment
4Corresponding, determine the value Vfh of third electrode G3 and the 5th electrode G5 current potential (Vf).Third electrode G3 when vertical haloing disappears and the current potential (V of the 5th electrode G5
f) value V
FvCan determine too.Can clearly be seen that V from Fig. 5
FhAnd V
FvValue at V
G4Overlap mutually when being 150 volts, the astigmatism of any electron beam so just can not take place, so △ V
fBe 0.Work as V
G4When value increased, astigmatism increased, as a result astigmatism voltage △ V
f(be V
FhDeduct V
Fv) increase.In this case, V
FhAnd V
FvMean value be mean focus V
fReduce, this magnification ratio that shows main lens reduces.Therefore work as V
G4Increase and V
fBe worth when constant, the distance that electron beam is focused between position and the main lens just increases.
In order to proofread and correct owing to the caused astigmatism of deflection the essential VG that increases when the electron beam deflecting is regional to frame border
4Value increase the astigmatism of main lens.The horizontal haloing of astigmatism increase that causes by main lens and check vertical haloing.On the other hand, because the caused astigmatism of deflection then increases vertical haloing, thereby these two kinds of astigmatisms can cancel each other, and increase V according to the deflection degree
G4Value can proofread and correct the astigmatism that causes owing to deflection in each zone of frame.
The main lens magnification ratio is along with VG
4Value increases and reduces, and this makes the electron beam focal position towards screen extension.Therefore, the position that electron beam is focused can be registered on the position of screen, and originally these two positions were because field bend was inconsistent.
As mentioned above, the increase according to the deflection degree improves V
G4Can proofread and correct simultaneously because the astigmatism that the electron beam deflecting and field bend cause.
In the embodiment of conventional device shown in Figure 4, because the groove on the 4th electrode G4 has the elongated shape of horizontal direction, very approaching mutually, this just produces such problem, electron lens corresponding to two outer beams is asymmetric to the vertical plane that comprises central shaft 17 and 19, its result makes the direction of outer beams bend towards middle electron beam, thereby produce bad influence to assembling, but, in the embodiment shown in fig. 1, owing to adopt the vertical direction slot, just solved this problem.
Fig. 6 represents to be added in dynamic current potential v on second member 122 of conventional electrical rifle the 4th electrode G4 shown in Figure 4 with the analysis that computer obtains
' G4, with astigmatism voltage △ V
fWith mean focus V
fBetween the result of relation, the size of this electron gun main lens is with used measure-alike in analysis shown in Figure 5, although groove is a level, the used size of analysis is also identical among its size and Fig. 5.Can be clear that by Fig. 6 electron gun routinely is because V
G4' change and the V that causes
fThe change quantity not sufficient with the alignment field bending.
As mentioned above, that shown in Fig. 1 proves that this structure is effective to first member 121 and the specific implementation on the 3rd member 123 that are added to the 4th electrode G4 with the synchronous signal of deflection electric current in the alignment field bending.The sort of conventional structure that signal is added on second member 122 is inappropriate.
Fig. 7 is for an example, in this example for correct astigmatism effectively face first member 121 of second member 122 ' and the surface of the 3rd member 123 ' bore portion on opened the long narrow groove 71 of horizontal direction.
Fig. 8 is a specific implementation, and first member 121 of the 4th electrode G4 " and the 3rd member 123 " is gone up aperture portion and separated the long narrow groove 81 of wearing of horizontal direction.As the dynamic current potential V that is added on first member 121 " and the 3rd member 123 "
G4Be higher than be added in second member 122 ' on current potential the time, the top horizontal direction of mentioning is long narrow wear groove 81 have first member 121 " and the 3rd member 123 " and second member 122 ' between astigmatism voltage is changed to positive level effect, in this case, because V
G4Be lower than the current potential (v of third electrode G3 and the 5th electrode G5
f), between third electrode G3 and first member 121 " between and the 5th electrode G5 and the 3rd member 123 ", finish making astigmatism voltage to the effect that negative level changes, work as V
G4When value increases, first member 121 " and the 3rd member 123 " and second member 122 ' between the astigmatism that produced increase, and the astigmatism that is produced between third electrode G3 and the 5th electrode G5 weakens, and no matter which kind of situation makes astigmatism all improve to the effect that the positive level direction changes.
Fig. 9 has represented the effect analysis result at embodiment shown in Figure 8, the size and that main lens measure-alike that is used for analysis shown in Figure 5 that are used for the electron gun main lens of this analysis go up the long narrow groove 81 of level except first member 121 " and the 3rd member 123 " and have the following size.
The 3rd member 123 " the diameter l of groove
3φ 4.1
The 3rd member 123 " the width W 2.0 of groove
(unit: millimeter)
The current potential that is added on each electrode is identical with the current potential that is used for analysis shown in Figure 5.
The result that we more once analyze among Fig. 9 and Fig. 5 as seen from Figure 9, makes astigmatism voltage △ V
fBe the V of zero first member 121 " and the 3rd member 123 "
G4' value is higher, is 660 volts, be added in second member 122 ' on current potential substantially identical, even this be because of second member 122 ' current potential equal V
G4', but second member 122 ' different with the 5th electrode G5 current potential with third electrode G3, also to produce astigmatism in the embodiment shown in fig. 1, on the other hand also because this astigmatism is offset by the astigmatism that the effect owing to the narrow groove 81 of level produces in the embodiment shown in fig. 8, therefore, compare with embodiment shown in Figure 1, in the embodiment shown in fig. 8 by third electrode G3, the 4th electrode G4 and the formed UPF power of a lens of the 5th electrode G5 are less, thereby the diameter of main lens exit electron beam is bigger.This can suppress because mutually exclusive space charge effect of the electronics in the effect electron beam of Coulomb force and because the electron beam broadening effect that produces at the hot initial velocity of electron beam irradiation direction that is distributed by hot initial velocity and to cause the effect that electron-baem spot increases on screen.
The analysis result of comparison diagram 9 and Fig. 5 obviously as seen, though to V
G4' variation △ V
fThe change amount substantially identical, but V
fThe change amount be reduced to half.This shows the following fact: the different configurations independent correct astigmatism of energy and the field bend that go up groove according to the astigmatism characteristic of various deflecting coils by first member 121 " with the 3rd member 123 " of the 4th electrode G4.
In the embodiment shown in fig. 8, the groove 81 on first member 121 of the 4th electrode G4 " and the 3rd member 123 " is respectively directly towards third electrode G3 and the 5th electrode G5.Because the potential difference between third electrode G3 and the 5th electrode G5 and the 4th electrode G4 is several kilovolts, power of a lens is very big, even these grooves do than second member 122 ' on those grooves little, act on still very big, therefore, even the employing level trough because size is little, can't be created in the bad influence that is run in the conventional embodiment shown in Figure 4 to convergence.
In a kind of embodiment shown in Figure 10 (a) and Figure 10 (b), the structure of having showed the 4th electrode G4 designs this structure and is in order to proofread and correct the rotation of the electron-baem spot that is caused by deflection in the bight of frame.The same with the mode of example shown in Figure 7, groove 101a and 103a open at the 4th electrode G4 first member 121a and the 3rd member 123a on the face of the second member 122a.The relative horizontal plane of the central shaft of groove 101a and 103a tilts, therefore, the relative horizontal plane of formed in this section electron lens also tilts, opposite by the first member 121a with the 3rd member 123a incline direction, the incline direction that is in the contiguous electron lens of respective members is also opposite, with the synchronous current potential V that changes of deflection electric current
G4' and V
G4" be added to independently on the first member 121a and the 3rd member 123a.Be added to the second electrode G2 and go up the identical fixed potential V of current potential
G2Be added on the second member 122a.If V
G4' and V
G4" greater than V
G2, the effect of electron-baem spot to the rotation of groove inclination rightabout just appears.That is to say, in the specific implementation shown in Figure 10 (a), look from negative electrode one side, the relative horizontal plane of groove 101a on the first member 121a is rotated counterclockwise, therefore electron-baem spot is just turned clockwise, on the other hand, Figure 10 (b) the 3rd member 123a that can show has the effect that is rotated counterclockwise electron-baem spot.
Figure 11 has used solid line and the chain-dotted line illustration respectively current potential V of the first member 121a
G4' waveform and the current potential V of the 3rd member 123a
G4" waveform, fixed potential V
G2Draw with double dot dash line.
The initial segment at vertical scanning phase V, electron-baem spot is positioned at frame top, The initial segment at horizontal scanning period H, electron-baem spot is positioned at the upper left corner of frame, in this case, and as can being clear that by Fig. 3, because deflection astigmatism electron-baem spot turns clockwise, as shown in figure 10, in horizontal scanning period and the The initial segment of vertical scanning phase, if make V
G4" greater than V
G4', then the 3rd member 123a makes effect that electron beam is rotated counterclockwise surpass the effect of the first member 121a, therefore because deflection focuses on the rotation of the electron-baem spot that the frame upper left corner produced can be corrected.When electron-baem spot scans in the middle of the frame top, V
G4' and V
G4" value become basic identical.Therefore, the effect of the first member 121a and the 3rd member 123a is cancelled out each other, and this just can stop the rotation of electron-baem spot.
When scanning the upper right corner of frame, V
G4' just greater than V
G4", the result like this, can be cancelled because deflection focuses on caused just rotating counterclockwise because the effect electron-baem spot of the first member 121a turns clockwise.Then, make V again at horizontal blanking interval
G4" be higher than V
G4', in horizontal scanning period H next time, make V
G4' be higher than V gradually
G4", as mentioned above, along with electron-baem spot scans to central vertical from frame top, the corner that deflection causes diminishes, and therefore will reduce V
G4' with V
G4" between difference, can be clear that by Fig. 3, when vertical scanning to the bottom of frame, the electron-baem spot of frame left end rotates counterclockwise, this is just the opposite with the situation at the upper half plane of frame, therefore will make V
G4' surpass V in the The initial segment of horizontal sweep
G4".When vertical scanning arrived the foot of frame, the corner of the electron-baem spot that deflection causes increased.Therefore, increase V gradually
G4' and V
G4" between difference to improve calibration result.
V
G4' and V
G4" mean value and V
G2Difference end and the initial sum of vertical scanning V ends greatlyyer in the initial sum of horizontal sweep H, current potential is provided with the calibration result that can improve in the big zone of astigmatism shown in Figure 3 like this.
As mentioned above, not only the astigmatism of electron-baem spot can be proofreaied and correct, and the rotation of bight luminous point also can proofread and correct, and like this, can obtain the luminous point of basic garden shape on whole screen.This is because oblique groove of opening on the first member 121a of the 4th electrode and the 3rd member 123a shown in Figure 10 (a) and Figure 10 (b) and V shown in Figure 11
G4' and V
G4" potential waveform due to.
Figure 12 has represented to be used for further proofreading and correct effectively the specific implementation that above-mentioned electron-baem spot rotates, wherein horizontal plane inclined notches formed 101b and 103b also begin on the second member 122a of the 4th electrode G4 relatively, incline direction need with open opposite to direction to the groove of the first member 121a of the second member 122a and the 3rd member 123a, the incline direction of therefore opening the groove on two sides of the second member 122a should be opposite mutually.
Figure 13 has represented it also is to be used for the embodiment of correcting electronic Shu Xuanzhuan.In this embodiment, first member 121b that relative horizontal plane inclined notches formed 13 is opened respectively at the 4th electrode G4 and the 3rd member 123b are on the face of third electrode G3 and the 5th electrode G5, Figure 14 has represented a specific implementation, wherein relatively horizontal plane inclined notches formed 14 is opened respectively at third electrode G3 and the 5th electrode G5 on the face of the 4th electrode G4, and above-mentioned two specific implementations are used for making between third electrode G3 and the 4th electrode G4 and formed electron lens inclination between the 4th electrode G4 and the 5th electrode G5.
No matter in which embodiment, opposite so that the electron lens of the incline direction of opening the groove on two electrodes also tilts in opposite direction, by the independent current potential that changes synchronously with the deflection electric current is added on the first member 121b and the 3rd member 123b, rotation that just can correcting electronic Shu Guangdian, effect is with shown in Figure 10 identical.
Demonstrate an advantage based on electron gun of the present invention, the astigmatism that astigmatism that causes to the colour crt screen fringe region owing to electron beam deflection and field bend cause just can all obtain correction simultaneously with a simple dynamically potential generating circuit, therefore, need not provide a dynamic potential generating circuit that separates to come correct astigmatism and field bend just can reduce screen edge zone electron-baem spot diameter and the uniformity of improving resolution.
High potential (the E of one 20 to 30 kilovolts of an alternative embodiment of the invention is described with reference to Figure 15 (a) and Figure 15 (b) now,
b) be added to by radome 15 and be labeled as 14 electrode G6.One 5 to 10 kilovolts middle current potential (focus voltage V
f) be added to the electrode G3 that is labeled as 11 and the electrode G5 that is labeled as 13, one 100 to 1500 volts low-voltage is added to and is labeled as 12 electrode G4, this electrode is divided into three members 121,122 ' and 123, electrode G3, G4 and G5 form UPF lens, and electrode G5 and G6 form BPF lens, and electron beam is focused on by the main lens that two lens being mentioned above the combination form.
The long narrow groove of vertical direction open be in second member 122 in the middle of three members ' the aperture part.With the synchronous first dynamic current potential V that changes of deflection electric current
G4' be added in this second member 122 ' on.Common potential V
G4Be added to first member 121 and the 3rd member 123 that are in second member, 122 ' both sides respectively.V
G4Be decided to be the dynamic current potential that changes synchronously with the deflection electric current.If the deflection electric current is big, cause big electron beam deflecting degree, V
G4Value to reduce to improve the magnification ratio of the formed non-axial symmetrical lens of groove.Therefore, eliminated the caused astigmatism of electron beam deflection.
Figure 16 has represented to analyze the result that the effect of embodiment shown in Figure 15 obtains with computer.
The concrete size of electron gun main lens that is used for this analysis is as follows:
The diameter in the hole on the electrode G3 is (by electrode G2
Side) φ 1.5
The diameter in the hole on the electrode G3 is (by electrode G4
Side) φ 4.0
The length 2.7 of electrode G3
Hole on electrode G4 first member and the 3rd member
Diameter phi 4.0
The first and the 3rd member 121 Hes of electrode G4
123 length 0.5
The diameter l in hole on electrode G4 second member
1φ 4.0
Groove diameter l
2φ 6.0
Well width W 3.0
Electrode G5 goes up diameter (by the electrode G4 side) φ 4.0 in hole
Electrode G5 goes up diameter (by the electrode G6 side) φ 8.0 in hole
Electrode G5 length 24.3
The diameter phi 8.0 in the hole on the electrode G6
(unit: millimeter)
Be added in the voltage (E that is labeled as on 14 the electrode G6
b) be 25 kilovolts, and shadow mask 4 is 340 millimeters to the electrode G3 that is labeled as 13 towards the distance of that face of electrode G4.Electron beam is focused on the shadow mask 4.
With change be added to electrode G4 second member 122 ' on the first dynamic current potential V
G4' and be added to the second dynamic current potential V on first member 121 and the 3rd member 123
G4Method can obtain the current potential (V of electrode G3 and electrode G5 when the horizontal haloing of center Screen portions of electronics Shu Guangdian disappears
f) value V
FhTo V
G4And V
G4' the relation of value and vertical haloing when disappearing electrode G3 and G5 go up current potential (V
f) value V
FvTo V
G4And V
G4' the relation of value.Can be clear that by Figure 16, work as V
G4Be 252 volts, V
G4Be 260 volts, V
G4' when being 700 volts, the value of Vfh and Vfv is identical, therefore there is no the electron beam astigmatism and takes place, and works as V
G4Increase and V
G4' by hour astigmatism that is resemble voltage △ V
fIncrease V
FhAnd V
FvMean value that is mean focus V
fReduce, this magnification ratio that shows main lens reduces.Therefore, work as V
G4Increase and V
G4' reduce to keep V
fConstant, then the electron beam focal position just increases to the distance between main lens, thereby realizes dynamic focusing.
In order to proofread and correct the astigmatism that deflection causes, when electron beam deflection arrives the fringe region of screen, must increase V
G4Value, reduce V
G4' value, to increase the astigmatism of main lens.The astigmatism of main lens has horizontal haloing of expansion and the effect that suppresses vertical haloing, and on the other hand, the astigmatism that deflection causes has the effect that increases vertical haloing.Like this, these two kinds of astigmatisms have just been cancelled each other, by increasing V according to the deflection degree
G4Value and reduce V
G4' value, the screen astigmatism that causes of deflection everywhere just can obtain proofreading and correct.
As mentioned above, by increasing V according to the deflection degree
G4Value and reduce V
G4The astigmatism that ' value can correcting electronic bundle deflection causes has been realized dynamic focusing simultaneously again.
In this case, adopt fixedly V
G4' and only dynamically change V
G4The method of value can realize astigmatic correction and dynamic focusing simultaneously.
Yet, if V
G4When ' value was fixed on roughly 600 to 700 volts, the astigmatic correction ability will reduce, and the result produces △ V
fMaximum be reduced to 600 to 750 volts of such problems, if V
G4' further increase, then the astigmatic correction ability further reduces.
On the other hand, V
G4' value reduces, by the electrode G3 that is labeled as 11, be labeled as 12 electrode G4 and be labeled as 13 the formed UPF power of a lens of electrode G5 and increase, consequently, electron beam is focused on consumingly by main lens, because space charge effect causes electron beam spot diameter increase on the screen, therefore, the resolution particularly resolution in center Screen zone descends.
Figure 17 has represented an embodiment, and in this embodiment, the long narrow groove of horizontal direction is opened at first member and the 3rd member on the face of second member, to improve the effect of astigmatic correction.
The invention provides a kind of electron gun, use a public dynamic potential generating circuit, in this electron gun, just can correcting electronic bundle deflection arrive the caused astigmatism of colour crt screen fringe region, realize dynamic focusing simultaneously again.
Owing to open according to the present invention on this device with three corresponding vertical channel of electron beam, the phase mutual interference between them is very little, therefore bad influence can not take place to assembling performance.
Since on first member 121 that the first dynamic current potential is added to the 4th electrode and the 3rd member 123 the second dynamic current potential be added to second member 122 ' on, the ability of proofreading and correct deflection focusing is the situation of fixing greater than the voltage of second member 122.
Claims (13)
1, electron gun that is used for picture tube, this electron gun have and produce electron beam and this electron beam is made the second electrode group of the main lens that electron beam focuses on along the lead fluoroscopic first electrode group and forming of original via on phosphor screen, it is characterized in that:
The said second electrode group is formed to linear distributing the 3rd, the 4th, the 5th and the 6th electrode of described phosphor screen direction by beginning from the said first electrode group;
Said the 4th electrode is by beginning to form to linear distributing first member of said phosphor screen direction, second member and the 3rd member from the said first electrode group;
Said second member has the non-circular hole that transmits described electron beam, and a constant potential is added to described second member; And
The described first and the 3rd member has the hole of transmitting described electron beam, make the high-velocity scanning in the horizontal direction of said electron beam on the deflecting coil with being added in, be added to this said first member and the 3rd member than the synchronous current potential that changes of the deflection electric current of low-velocity scanning in vertical direction.
2, picture tube electron gun according to claim 1, wherein said non-circular hole perpendicular to the size on the vertical direction of horizontal direction greater than size in said horizontal direction.
3, picture tube electron gun according to claim 2, wherein being added in said current potential on the said first and the 3rd member has with the deflection electric current of said electron beam and increases.
4, picture tube electron gun according to claim 1, the said current potential that wherein is added on the said first and the 3rd member is public mutually.
5, picture tube electron gun according to claim 1, the said first and the 3rd wherein relative with said second member member has long narrow groove on the side in two side faces respectively at least, said groove and said bore portion adjacency, and with said horizontal direction parallel.
6, picture tube electron gun according to claim 1, wherein a member in the said at least first or the 3rd member has perpendicular to the hole of the size on said horizontal direction vertical less than the size on said horizontal direction.
7, picture tube electron gun according to claim 2, wherein said first has relative said horizontal direction respectively with the 3rd member is inclination, with at the adjacent long narrow groove in said hole on the centre of said second member, the said groove on said groove on said first member and said the 3rd member tilts in opposite mode mutually.
8, picture tube electron gun according to claim 7, wherein said second member has long narrow groove on the face relative with the said first and the 3rd member, said long narrow groove tilts in the direction opposite with the incline direction of groove on said opposite first and the 3rd member.
9, picture tube electron gun according to claim 1, wherein with the long narrow groove of said horizontal direction parallel open the bore portion adjoiner at least one face relative with said first member with said third electrode and with at least one relative mutually face of said the 5th electrode and said the 3rd member on the bore portion adjoiner.
10, picture tube electron gun according to claim 7, wherein be added to respectively on said first member and the 3rd member with the synchronous current potential that changes of said deflection electric current, form a cathode lens on the passage of the said electron beam between said second member of said first member and on the said passage of the said electron beam between said second member and said the 3rd member, forming a second electron lens, when said electron beam in the direction vertical during by deflection with said horizontal direction, the magnification ratio of said cathode lens and said second electron lens is set to identical substantially, and when said electron beam with the direction of said horizontal direction parallel during by deflection, the magnification ratio of an electron lens in said cathode lens and the said second electron lens is changed to magnification ratio greater than another electron lens by epidemic disease.
11, picture tube electron gun, this electron gun have produce electron beam and with said electron beam along lead fluoroscopic first electrode assembly and form and be used for said electronics is not focused on second electrode assembly of the main lens on the said phosphor screen of original via, it is characterized in that:
Said main lens is by begin towards the electrode G3 of said phosphor screen straight line distribution electric G4, electrode G5 and electrode G6 formation from said first electrode assembly;
A high potential is added to said electrode G6;
Middle current potential is added to said electrode G3 and electrode G5;
Said electrode G4 first electrode assembly of saying certainly is divided into i.e. first member of a part, second member and the 3rd member to said phosphor screen direction;
Be distributed in the hole that is used for transmitting said electron beam on said second member and make non-circular shape, wherein said hole size in the horizontal direction is less than comprising corresponding to the diameter in path the most initial in said hole and the plane vertical with said horizontal direction, there is the deflection degree of electron beam to increase along with said, the current potential that is added on said first member and said the 3rd member increases, and the current potential that is added on said second member reduces.
12, picture tube tube electron gun according to claim 11, it is identical with current potential on said the 3rd member wherein to be added in said first member.
13, picture tube electron gun according to claim 11, groove are opened in the both sides of said first member and said the 3rd member or the hole adjoiner of the said electron beam of transmission on the side surface.Each said groove part has a symmetrical plane consistent with said horizontal direction.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61288798A JP2569027B2 (en) | 1986-12-05 | 1986-12-05 | Electron gun for color picture tube |
| JP288798/86 | 1986-12-05 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN87107267A CN87107267A (en) | 1988-07-06 |
| CN1018107B true CN1018107B (en) | 1992-09-02 |
Family
ID=17734866
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN87107267A Expired CN1018107B (en) | 1986-12-05 | 1987-12-05 | Electron gun of picture tube |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2569027B2 (en) |
| KR (1) | KR900009081B1 (en) |
| CN (1) | CN1018107B (en) |
| DE (1) | DE3741202A1 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63241842A (en) * | 1987-03-30 | 1988-10-07 | Toshiba Corp | Color cathode-ray tube |
| JP2661059B2 (en) * | 1987-09-04 | 1997-10-08 | ソニー株式会社 | Cathode ray tube |
| US4877998A (en) * | 1988-10-27 | 1989-10-31 | Rca Licensing Corp. | Color display system having an electron gun with dual electrode modulation |
| KR910007800B1 (en) * | 1988-11-05 | 1991-10-02 | 삼성전관 주식회사 | Dynamic focus electron gun |
| KR970011874B1 (en) * | 1989-07-31 | 1997-07-18 | Lg Electronics Inc | Electron gun for color picture tube |
| KR970008564B1 (en) * | 1989-11-21 | 1997-05-27 | 엘지전자 주식회사 | Color cathode-ray tube of electron gun |
| JP3053845B2 (en) * | 1990-06-07 | 2000-06-19 | 株式会社日立製作所 | Cathode ray tube |
| KR930000580B1 (en) * | 1990-08-31 | 1993-01-25 | 주식회사 금성사 | Electron gun for cathod ray tube |
| JPH0729511A (en) * | 1993-07-14 | 1995-01-31 | Hitachi Ltd | Electron gun and color cathode-ray tube |
| KR100230435B1 (en) * | 1996-09-06 | 1999-11-15 | 손욱 | Electron gun for color cathode ray-tube |
| JPH1167120A (en) * | 1997-08-25 | 1999-03-09 | Sony Corp | Electron gun for color cathode-ray tube |
| JP2002197990A (en) * | 2000-12-27 | 2002-07-12 | Toshiba Electronic Engineering Corp | Cathode ray tube device |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4277722A (en) * | 1978-02-15 | 1981-07-07 | Tektronix, Inc. | Cathode ray tube having low voltage focus and dynamic correction |
| US4234814A (en) * | 1978-09-25 | 1980-11-18 | Rca Corporation | Electron gun with astigmatic flare-reducing beam forming region |
| JPS55154044A (en) * | 1979-05-18 | 1980-12-01 | Hitachi Ltd | Electrode structure of electron gun and its manufacture |
| JPS58198832A (en) * | 1982-05-14 | 1983-11-18 | Matsushita Electronics Corp | Cathode-ray tube device |
| JPS59111237A (en) * | 1982-12-16 | 1984-06-27 | Matsushita Electronics Corp | Cathode ray tube device |
| JPS6142841A (en) * | 1984-08-02 | 1986-03-01 | Matsushita Electronics Corp | Color picture tube |
| JPS6174246A (en) * | 1984-09-20 | 1986-04-16 | Toshiba Corp | Electron gun for color picture tube |
| JPS6199249A (en) * | 1984-10-18 | 1986-05-17 | Matsushita Electronics Corp | Picture tube apparatus |
-
1986
- 1986-12-05 JP JP61288798A patent/JP2569027B2/en not_active Expired - Fee Related
-
1987
- 1987-12-04 DE DE19873741202 patent/DE3741202A1/en active Granted
- 1987-12-05 KR KR1019870013878A patent/KR900009081B1/en not_active IP Right Cessation
- 1987-12-05 CN CN87107267A patent/CN1018107B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN87107267A (en) | 1988-07-06 |
| JP2569027B2 (en) | 1997-01-08 |
| JPS63143725A (en) | 1988-06-16 |
| KR900009081B1 (en) | 1990-12-20 |
| KR890010994A (en) | 1989-08-11 |
| DE3741202A1 (en) | 1988-06-09 |
| DE3741202C2 (en) | 1993-07-01 |
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