CN1130302A - Colour display system by using quadrupole lens - Google Patents
Colour display system by using quadrupole lens Download PDFInfo
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- CN1130302A CN1130302A CN95119692A CN95119692A CN1130302A CN 1130302 A CN1130302 A CN 1130302A CN 95119692 A CN95119692 A CN 95119692A CN 95119692 A CN95119692 A CN 95119692A CN 1130302 A CN1130302 A CN 1130302A
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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
- H01J29/56—Arrangements for controlling cross-section of ray or beam; Arrangements for correcting aberration of beam, e.g. due to lenses
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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
- H01J29/58—Arrangements for focusing or reflecting ray or beam
- H01J29/62—Electrostatic lenses
- H01J29/626—Electrostatic lenses producing fields exhibiting periodic axial symmetry, e.g. multipolar fields
- H01J29/628—Electrostatic lenses producing fields exhibiting periodic axial symmetry, e.g. multipolar fields co-operating with or closely associated to an electron gun
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
- H01J29/48—Electron guns
- H01J29/50—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
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- 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
Abstract
A color display system includes a color cathode ray tube having an electron gun having at least a cathode, a control electrode, an accelerating electrode, a focus electrode and an anode. The focus electrode includes a first focus electrode, a second focus electrode and a third focus electrode. The focusing electrode is constituted of the first/second/third focusing electrodes, to provide the first four-electrode lens structure in at least one of an opposed surface to the second focusing electrode of the first focusing electrode or of an opposed surface to the first focusing electrode of the second focusing electrode. The second four-electrode lens structure is provided in at least one of an opposed surface to the third focusing electrode of the second focusing electrode or of an opposed surface to the second focusing electrode of the third focusing electrode.
Description
The present invention relates to a kind of color display system, more particularly, relate to a kind of cathode ray tube that definition has been improved on the whole phosphor screen.
The definition of color cathode ray tube depends on the size and dimension of beam spot on the phosphor screen.
If electron gun institute electrons emitted bundle impinges upon on the phosphor screen and to be directed at the diameter of the luminous beam spot of phosphor screen tiny and near one true circular, just can provide good definition.
In shooting to the phosphor screen way, be subjected to level and straight deflection of hanging down by electron gun electrons emitted bundle, arrive phosphor screen then.Fluoroscopic central area is different to the distance of deflection center with external zones, thereby when the deflection of electron beam increased, the shape of beam spot was elongated in vertical direction mostly.
In launching the so-called in-line gun of three electron beams, the both sides electron beam moves apart the ray tube tubular axis, and their convergence is degenerated at fluoroscopic external zones, and definition descends.
Fig. 1 is a viewgraph of cross-section, illustrates to have used structure example of the present invention in the color cathode ray tube.Label 1 presentation surface plate portion, 2 is the glass wimble fraction, and 3 is the glass neck portion, and 4 is phosphor screen, and 5 be shadow mask, is colour selection electrode.Label 6 expression third electrodes, 7 is the 4th electrode, and 8 is shielding cup, and 14 is deflecting coil, and 15,16 and 17 is the central axis of electron beam, 18 and 19 is the center in the side electron beam channel aperture of the 4th electrode 7.
Cathode portion K
1, K
2And K
3, first electrode 10 and second electrode 20 are formed so-called triode portion.
As shown in the figure, color cathode ray tube comprises: the shell of finding time forms faceplate part 1 and is connected to the sidewall of faceplate part 1 through glass awl 2; One is combined in the electron gun in the glass neck 3, and deflecting coil 14 is contained in glass wimble fraction 2 and glass neck portion 3 near the outer wall their junctions, and multiple aperture shadow mask 5 adjoins 4 with predetermined interval and installs.
Red, green and blue fluorescent material is coated on the phosphor screen with strip or point-like.
Three electron beams by electron gun emission select look by shadow mask 5, strike on the fluorescent material relevant with electron beam separately, make light-emitting phosphor.
Electron gun comprises: electron beam produces part, in order to from cathode portion K
1, K
2And K
3Produce, quicken and control three parallel electron beams that become word order; One prefocus lens part is in order to focused beam a little; One prefocus lens part is in order to the electron beam that focuses on a little; And a main lens part, in order to electron beam being focused on the phosphor screen 4, three electron beams are by magnetic deflection coil 14 deflections, so as on phosphor screen 4 with the rectangular raster scanning beam.
Be the structure of an example shown in the figure, various electron guns are known with the shape in electron beam aperture and the structure of electrode in the electrode number of forming it, the electrode.
Fig. 3 A and 3B illustrate the deflection and the shape distortion of the electron-beam point that is caused by magnetic deflecting field.The electron beam that is deflected to the phosphor screen periphery is subjected to the extension f of horizontal direction
hFocusing force f with vertical direction
v, as shown in Figure 3, and add the power F of deflection beam as shown in Figure 3A
h, and form the distortion point-like.
The shape of the beam spot on the phosphor screen of Fig. 4 explanation, though the beam spot in phosphor screen 3 centers is circular, but the beam spot that produces in the phosphor screen external zones then distorts to non-circular, the vertical big elongation that promptly comprises a high-intensity core BC and a halation BH, particularly halation BH influences focus characteristics nocuously.
As the countermeasure that focus characteristics degenerates, can lift the disclosed technology of Japanese Patent Application Publication 62-58549.
Fig. 5 is a viewgraph of cross-section, the disclosed electron gun structure of above-mentioned prior art is described, symbol K
1, K
2And K
3The expression negative electrode, label 10 is a control gate, 20 is accelerating electrode, and 30 is first focusing electrode, and 40 is second focusing electrode, 48 is edge electrodes, 50 is the 3rd to focus on electrode, and 60 is anode, 11,12,13,21,22,23,31,32,33,41a, 42a, 43a, 41b, 42b, 43b, 51 a, 52a, 53a, 51b, 53b, 61,62 and 63 be respectively its electron beam channel aperture, 44,45,46 and 47 is vertical panel, and 54 and 55 is level board.Symbol C represents an electron gun axis (with the dead in line of pipe), S
1Be the displacement of side electron beam electron gun axis C, and S
2Each side electron beam channel aperture 61 and 63 displacements for anode 60 from electron gun axis C.
Fig. 6 is the plan view of accelerating electrode 20 on arrow 100 directions shown in Figure 5, and Fig. 7 is the plan view of second focusing electrode on arrow 101 directions, and Fig. 8 is the plan view of second focusing electrode 50 on arrow 102 directions.
As shown in Figure 6, be stacked in three electron beam channel apertures 21,22 and 23 on first focusing electrode, 30 sides of accelerating electrode 20 in the slit 24,25 and 26 of extending on three electron beam word order directions.
As shown in Figure 7, second focusing electrode 40 focuses on the 3rd has circular electron beam channel aperture 41b, 42b and 43b on electrode 50 sides, and also has first plate electrode (vertical panel) on the 3rd opposite that focuses on electrode 50.It comprises and vertical dull and stereotyped 44,45,46 and 47 on four each fixing aperture offsides focuses on electrode 50 so that stretch to the 3rd.
Second focusing electrode 40 has edge electrodes 48, and it centers on first plate electrode, and stretches out a preset distance from parallel-plate 44a, 45a, 46a and 47a end towards the 3rd focusing electrode 50.
As shown in Figure 8, the 3rd focuses on electrode 50 has three circles on second focusing electrode, 40 sides electron beam channel aperture 51a, 52a and 53a, and has second plate electrode, it comprises pair of parallel plate 54,55, parallel-plate is fixing vertically clamping three circular electron beam passage apertures, and extend towards second focusing electrode 40.The horizontal andante 54a, 55a, 46a and the 47a that form second plate electrode isolate a predetermined space L.
During electron gun work, at negative electrode K
1And K
2On add 50 to 170V, add 0 to-150V on the control gate 10, add 400 to 800V on the accelerating electrode 20, on second focusing electrode 40, add 5 to 8KV as focus voltage V
f, on anode 60, add 23 to 30KV as anode voltage E
b, and dynamic electric voltage DV
fSynchronously change with first focusing electrode 30 and the 3rd level and the vertical deflection that focuses on the electron beam on the electrode 50.
When electron beam is not subjected to deflection, focuses between the electrode 50 and do not have potential difference at first focusing electrode 30, second focusing electrode 40 and the 3rd.Therefore, the parallel-plate that occurs in second focusing electrode 40 (the vertical utmost point) 44,45 and 47 and be fixed on the 3rd not influence of 54 and 55 pairs of beams of parallel-plate (level board) that focuses on electrode 50, the cross section of electron beam is elongated by the quadrupole lens level, quadrupole lens is to be formed by the slit 24,25 of extending on the direction of the word order of three electron beams on the side of first electrode 30 of accelerating electrode 20 and 26, but electron beam is producing best focusing by the 3rd main lens that focuses between electrode 50 and the anode 60 on the phosphor screen.
By accelerating electrode 20 electrons emitted bundles, Figure 10 is the electron optic electron beam trace of expression under above-mentioned operating voltage condition in Fig. 9 explanation.
Leave the slit 24,25 of accelerating electrode 20 and 26 electron beam.Be subjected to the effect of strong vertical focusing, the cross section of each electron beam horizontal extension on phosphor screen, as shown in Figure 9.At this moment the H of high current density part forms in the center of each cross section part, and the L part of low current density then forms on its both sides.
When electron beam was not subjected to deflection, the track of electronics owing to spherical aberration, was used P as shown in figure 10
hThe expression electron beam too focuses in the horizontal direction, with P
vThe expression electron beam focuses on deficiency in vertical direction, regulates focus voltage, to focus in the scope W shown on the phosphor screen.
Beam spot on the phosphor screen has the shape of the vertical elongated that comprises high current density H part at this moment.
Figure 11 illustrates the parallel-plate (vertical panel) 44,45,46 and 47 and be fixed on the 3rd effect that focuses on the 54 and 55 pairs of beam spots of parallel-plate (level board) on the electrode 50 in second focusing electrode 40.
Figure 12 explanation is fixed on the effect of the 54 and 55 pairs of beam spots of parallel-plate (level board) on the 3rd focusing electrode 50.
When the amount of deflection of each electron beam increases, make first focusing electrode 30 and the 3rd current potential that focuses on electrode 50 be higher than the current potential of second focusing electrode 40.Therefore, the strong-focusing effect (F of the horizontal directions that in second focusing electrode 40, produce as shown in figure 11 by parallel-plate (vertical panel) 44,45,46 and 47
v＜F
h), and as shown in figure 12 by being fixed on the 3rd parallel-plate (level board) 54 and the 55 strong disperse functions of vertical direction that produce that focus on the electrode 50, formed the quadrupole lens electric field, and the cross section of electron beam forms the figure of vertical elongated, reduced the 3rd potential difference that focuses between electrode 50 and the anode 60 simultaneously, weakened the focussing force that produces by main lens, made electron beam produce optimum focusing at fluoroscopic external zones.
The effect of above-mentioned quadrupole lens is the influence of cancellation magnetic deflection aberration to electron beam, so that electron beam produces optimum focusing on screen.Yet, electron beam enters by the 3rd and focuses on electrode 50 and the incident angle of anode 60 formed main lenss and the diameter of beam, be different with vertical direction in the horizontal direction, the shape that importantly makes beam spot is near circular, because of the power of lens of main lens is different with vertical direction in the horizontal direction.
Figure 13 A and 13B explanation is when electron beam during by horizontal deflection, and by the second and the 3rd optical equivalence figure that focuses on the quadrupole lens of electrode and electron beam trace generation, Figure 13 A is a horizontal sectional view, and Figure 13 B is a vertical cross-section.Numbering 70 expressions are equivalent to the crossover of the object of lens combination, 72 is convex lens, representative is by the horizontal focusing effect that focuses on the quadrupole lens electric field generation that forms between the electrode at second focusing electrode and the 3rd, 73 is main lens, 74 is concavees lens, the horizontal divergence effect that representative is produced by magnetic deflecting field, 75 is phosphor screen, 76 is electron beam trace, 78 is concavees lens, represents the vertical divergence effect, and 79 is convex lens, the vertical focusing effect that representative is produced by magnetic deflecting field, 80 is the rum point of beam on phosphor screen.
As shown in the figure, the electron lens system can be expressed as optical equivalence, by object 70 sides in the horizontal cross-section tactic convex lens, convex lens and concavees lens and in vertical cross-section tactic concavees lens, convex lens and convex lens represent.When regulating lens combination for obtaining level with vertical optimum focusing, there is α at level and vertical incidence angle that beam impinges upon on the phosphor screen 75
H＜α
VRelation.
Suppose that electron beam leaves object 70 with an angle of emergence α, and through lens combination on position 80 with an incidence angle α
0Impinge upon on the phosphor screen, the current potential on object 70 and phosphor screen is respectively V and V
1, then the saturating M of the amplification of electron lens system generally can be expressed as
The horizontal magnification factor MH of lens combination can be expressed as
And vertical magnification ratio can be expressed as
As mentioned above, level and the vertical incidence angle that impinges upon on the phosphor screen 75 has (α/α
V) relational expression, the diameter of beam spot is extended in the horizontal direction.
Be level of corrections and vertical power of lens, form slit 24,25 and 26 in the accelerating electrode 20, as shown in Figure 6.
The level that the optical equivalence thing representative of Figure 14 A and 14B explanation is made by the slit of accelerating electrode and the correction of vertical lens magnification ratio, Figure 14 A is a horizontal sectional view, Figure 14 B is a vertical cross-section.
Shown in Figure 14 A and 14B, the convex lens 71 that the quadrupole lens electric field that is produced by the slit of accelerating electrode produces have the weak focus effect in the horizontal direction, and convex lens 77 have the strong-focusing effect in vertical direction.
Enter convex lens 71 with an angle [alpha] in the horizontal direction from object 70 electrons emitted bundles, its focussing force than vertical direction a little less than, make the angle of emergence of horizontal direction become α ', and the angle of emergence of vertical direction becomes the α less than α near α ".In this case, often move backward from the object space of looking by the electron beam of convex lens 71 or 77 by object 70.Yet because accelerating electrode is on crossover location, this moving is very little, and be negligible.
Because the quadrupole lens effect of electric field that produced of accelerating electrode slit, make electron beam in the angle of emergence of vertical direction the angle of emergence less than horizontal direction.As a result, will can not become too greater than glancing incidence angle α ' H, thereby α ' V can think and almost equates with α ' H by electron lens system and the vertical incidence angle α ' V that impinges upon the electron beam of phosphor screen point 80.That is, vertical and horizontal power of a lens MV and MH can think almost equal each other.
After doing like this, can on whole phosphor screen, obtain best focus characteristics.
According to aforementioned prior art, when the most sub-bundle was not subjected to deflection, because the slit of accelerating electrode, electron beam can elongation on level during quadrupole lens work.Therefore, the beam spot on the phosphor screen can be from the relation of aforementioned electric current distribution elongation in vertical direction, the cross section of electron beam increases to some extent because of the correction of the difference between level and vertical focal length, in view of the above, horizontal definition degenerates easily.
In the electron gun of prior art, in order to work under big feam column, the quadrupole lenses pair electron beam that is formed by the accelerating electrode slit produces stronger effect.When beam is not subjected to deflection, the perpendicular diameter of beam spot increases, in addition when electron beam is deflected fluoroscopic corner, the effect of quadrupole lenses pair beam (horizontal extension of cross section) is stronger, and the electron beam horizontal diameter of main lens inner edge increases, as a result, give the worse influence of spherical aberration, and increase the horizontal diameter of electron beam.
These all can make the uniformity that depends on the beam spot of line amount on the whole phosphor screen degenerate.
The electric current distribution of electron beam is inhomogeneous, and it is at the center height, and low at the place, periphery, because the rigging error of the physical change of electrode and its electron gun, electric current distribution is easy to produce uneven.The electron beam deflecting is during to fluoroscopic corner, and low current density is partly also because magnetic deflecting field and produce unevenly once more degenerates image quality.
The objective of the invention is to solve the problems referred to above of prior art, and a kind of color cathode ray tube will be provided, its electron gun can produce satisfied definition on whole phosphor screen, and a kind of color display system that uses this ray tube is provided.
According to an aspect of the present invention, a kind of color cathode ray tube is provided, its electron gun comprises at interval by order on axis: at least one cathode, one control electrode, an accelerating electrode, a focusing electrode and an anode, wherein focusing electrode comprises at interval that by order at least one first focusing electrode, one second focusing electrode and the 3rd focus on electrode, and first focusing electrode is towards accelerating electrode; First quadrupole structure is forming towards first focusing electrode of second focusing electrode and second focusing electrode towards first focusing electrode of a part by at least a portion; And second quadrupole structure be to focus on second focusing electrode of electrode and the trimerization electrode towards second focusing electrode of a part forms towards the 3rd by at least a portion.
According to a further aspect in the invention, its color display system that provides comprises: one has the color cathode ray tube of electron gun, this ray tube is being pressed between order on the axis across at least one negative electrode, control electrode, an accelerating electrode, a focusing electrode and an anode, wherein focusing electrode comprises at interval according to the order of sequence that on axis at least one first focusing electrode, one second focusing electrode and the 3rd focus on electrode, and first focusing electrode is towards accelerating electrode; One first quadrupole structure is formed with second focusing electrode of a part towards first focusing electrode by first focusing electrode of at least a portion towards second focusing electrode; One second quadrupole structure forms because at least a portion focuses on electrode with a part towards the 3rd of second focusing electrode towards the 3rd second focusing electrode that focuses on electrode; An and dynamic focus voltage, it is high voltage with the changes in deflection to of electron beam than being added to the second focusing electrode voltage, dynamic focus voltage is added to the first and the 3rd and focuses on voltage, make the quadrupole structure of winning produce horizontal divergence and vertical focusing effect, and second quadrupole structure is to electron production horizontal focusing and vertical divergence effect to electron beam.
According to the present invention with aforementioned structure, when electron beam is not subjected to deflection, can make the magnification ratio of level and vertical lens in being formed at the 3rd main lens that focuses between electrode and anode, do to such an extent that be equal to each other, and produce the almost real circular and little beam spot of one-tenth by negative electrode institute electrons emitted bundle.
When the amount of deflection of electron beam increases, electron beam is by the horizontal divergence that quadrupole lens produced that forms between first focusing electrode and second focusing electrode and vertical focusing effect, focus on vertical divergence that quadrupole lens produced and the horizontal focusing effect that forms between electrode by second focusing electrode and the 3rd then, the beginning horizontal extension, the imbalance between the vertical-horizontal power of lens is corrected.Correcting value changes with electron-beam deflection amount in addition, auxometric correction can design on demand, the distribution of current density in the electron beam of horizontal extension is with to use accelerating electrode shown in Figure 6 20 different and the almost homogeneous that becomes has reduced because the amount of unbalance in the halation that the rigging error of electron gun causes.
When electron beam is not subjected to deflection, can provide a real circular and little beam spot by focusing on the main lens that forms between electrode and anode the 3rd by the electron beam of cathode emission.
In addition, according to the present invention, when the voltage that is deflected, is added to first focusing electrode when electron beam rose, the electric field strength in the interval between the accelerating electrode and first focusing electrode increased (power of lens increase), and the angle of divergence of leaving the electron beam of accelerating electrode reduces.
This of beam divergence angle dwindles, when electron beam is subjected to deflection, reduce two quadrupole lenss in previous beam diameter and the beam diameter in the main lens; The horizontal extension that suppresses electron beam under the big electric current; The influence of the deflection aberration that reduces the spherical aberration influence of main lens and produce by magnetic deflecting field.The minimizing of these two aberrations has improved the uniformity of the shape of beam spot on the whole phosphor screen under little extremely big current range.
Fig. 1 is a viewgraph of cross-section, and the structure example that has used color cathode ray tube of the present invention is described.
Fig. 2 illustrates magnetic deflecting field, acts on the electron beam that is produced by deflecting coil.
Fig. 3 A and 3B explanation are by the deflection of the electron beam of magnetic deflecting field generation and the distortion of electron-beam point shape.
Fig. 4 illustrates the shape of the beam spot on the phosphor screen.
Fig. 5 is a viewgraph of cross-section, and the structure of prior art electron gun is described.
Fig. 6 is a plane graph, and the accelerating electrode on arrow shown in Figure 5 100 directions is described.
Fig. 7 is the plan view of second focusing electrode on arrow 101 directions shown in Figure 5.
Fig. 8 is the plan view that the 3rd on arrow 102 directions shown in Figure 5 focus on electrode.
The beam spot shape of Fig. 9 explanation on phosphor screen under the operating voltage shown in Figure 5.
Figure 10 is the schematic diagram of lensing on the expression electron beam.
Figure 11 illustrates the parallel-plate (vertical panel) in second focusing electrode and is fixed on the 3rd and focuses on the influence of the parallel-plate (level board) of electrode to beam spot.
Figure 12 explanation is fixed on the 3rd and focuses on the influence of the parallel-plate (level board) of electrode to beam spot.
The track of electron beam when Figure 13 A and 13B are subjected to horizontal deflection with optics equivalent explanation electron beam.
The correction that Figure 14 and 14B use optical equivalence thing explanation level and vertical lens magnification ratio to be produced by the accelerating electrode slit.
Figure 15 is a viewgraph of cross-section, and the structure of an embodiment of the electron gun that color cathode ray tube of the present invention is used is described.
Figure 16 A and 16B illustrate respectively first focusing electrode on arrow shown in Figure 15 103 directions front view and to the effect of electron beam.
Figure 17 explanation near the accelerating electrode shown in Fig. 5 to the lensing of electron beam.
Below with reference to accompanying drawing to describe embodiments of the invention in detail.
Figure 15 is a viewgraph of cross-section, and the structure of the present invention for an embodiment of the electron gun of colorful cathode ray tube is described.
Figure 16 A is the front view of the first focusing flat plate electrode on the direction of arrow shown in Figure 15 103, the effect of the electrode pair electron beam shown in Figure 16 B key diagram 16A.
In Figure 15,16A and 16B, symbol K
1, K
2And K
3The expression negative electrode, numbering 10 is a control electrode, 20 is accelerating electrode, 30 is first focusing electrode, 35 is the first focusing flat plate electrode, 40 is second focusing electrode, 48 is edge electrodes, 50 is the 3rd focusing electrode, 60 is anode, 11,12,13,21,22,23,31a, 32a, 33a, 31b, 32b, 33b, 41a, 42a, 43a, 41b, 42b, 43b, 51a, 52a, 53a, 51b, 52b, 53b, 61,62 and 63 are respectively its electron beam channel aperture, 36,37 and 38 is the rectangular aperture of vertical elongated, 44,45,46 and 47 is vertical panel, and 54 and 55 is level board.
Symbol C represents electron gun axis (with the dead in line of pipe), S
1Be of the displacement of each side electron beam from electron gun axis C, and S
2Each side electron beam channel aperture 61 and 63 displacements for anode 60 from electron gun axis C.
First focusing electrode 30 has circular channel aperture 31a, 32a, 33a, 31b, 32b and 33b.The first focusing flat plate electrode 35 has the rectangular aperture 36,37 and 38 of vertical elongated, and is electrically connected to first focusing electrode 30.
Focus on the end face of second focusing electrode 40 of electrode 50 sides the 3rd and to have first plate electrode (vertical panel) that is formed by four vertical parallel plates 44,45,46 and 47, these four blocks of parallel-plates are fixed on respectively on the relative side of three circular electron channel aperture 41b, 42b and 43b.Second focusing electrode 40 has edge electrodes 48, and the latter is round first plate electrode, and focuses on electrode 50 from this vertical dull and stereotyped end 44a, 45a, 46a and 47a towards the 3rd and extend a preset distance.
In the end face of the thirdly focusing electrode 50 of the side of second focusing electrode 40, have circular electron beam channel aperture 51a, 52a and 53a, and have second plate electrode that forms by a pair of horizontal andante 54 and 55 fixed thereon and extend towards second focusing electrode 40, so that vertically clamp the electron beam channel aperture.
Form the edge electrodes 48 that the parallel-plate 54 of second plate electrode and 55 end 54a and 55a stretch into second focusing electrode 40, and along end 44a, the 45a of the axis of electron gun and vertical parallel plates, 46 and 47a separate a predetermined space L.
In the end face of anode 60, be formed with three circular electron beam passage apertures 61,62 and 63.Side electron beam channel hole is from the displacement S of electron gun axis in the anode 60
2And anode K
1And K
3And the displacement S in the side electron beam channel aperture of control gate 10, accelerating electrode 20, second focusing electrode 40 and the 3rd focusing electrode 50
1, S
2And S
1Between keeping S
2＞S
1Relation, focus on the 3rd and to form a main lens, side electron beam SB between electrode 50 and the anode 60
1And SB
2Be designed on phosphor screen, be converged to center electron beam CB.
In electron gun when work, add 50 to 170V on negative electrode, add 0 to-150V on control gate, adds 200 to 1000V on accelerating electrode, adds 4 to 10KV and (be called V later on second focusing electrode 40
f), on anode, add 23 to 30KV and (be called E later on
b), and dynamic electric voltage DV
f, it synchronously changes with first focusing electrode 30, the first focusing flat plate electrode 35 and the 3rd level and the vertical deflection that focuses on the electron beam on the electrode 50.
When electron beam is not subjected to deflection, between first focusing electrode 30, the first focusing flat plate electrode 35, second focusing electrode 60 and the 3rd focusing electrode 50, there is not potential difference.Therefore, because the rectangular aperture 36,37 of the vertical elongated in the first focusing flat plate electrode 35 and the parallel-plate (vertical panel) 44,45,46 and 47 in 38, second focusing electrode 40, and be fixed on the 3rd parallel-plate (level board) 54 and 55 that focuses on the electrode 50, so to not influence of electron beam, electron beam from negative electrode, owing to be formed on the effect of the main lens of the 3rd focusing electrode 50 and anode 60, on phosphor screen, form round and little beam spot.
When the amount of deflection of electron beam increased, the 3rd current potential that focuses on electrode 30 increased, and as shown in figure 17, the potential difference that first focusing electrode 30 and accelerating electrode are 20 further increases, the equipotential line E that represents with solid line between first focusing electrode 30 and accelerating electrode 20
1, E
2And E
3Become the more crooked equipotential line E ' that is illustrated by the broken lines
1, E '
2And E '
3
The electron beam of this moment is to be subjected to stronger focussing force at 0 o'clock than magnetic deflecting field, the beam diverging angle of electron beam orbit BC is reduced into the track that Be represents among the aperture 31b of first focusing electrode 30, and entering the first focusing flat plate electrode 35 and second before this, got between the burnt electrode 40 electron beam, its cross section enters second focusing electrode 40 and the 3rd then continuously and focuses between the electrode 50 and the 3rd lens that focus between electrode 50 and the anode because of quadrupole lens effect horizontal extension.
The dynamic electric voltage variable quantity (for example, for fluoroscopic useful scanning area, this voltage is 200 to 800V) near the voltage that is added to accelerating electrode 20 (for example be 200 to 1000V), be added to towards for have low voltage (for example 200 to 1000V), and and first focusing electrode 30 of the synchronous accelerating electrode 20 of beam deflection, cause effective dynamic focusing to change.
The dynamic difference focus voltage Dv of the fluoroscopic useful scanning area of color cathode ray tube and the voltage Av that is added to accelerating electrode 20 that is measured by control electrode 10 preferably can satisfy following inequality:
0.2≤Dv/Av≤4
In the formula dynamic difference focus voltage Dv be when electricity bundle the dynamic focus voltage of fluoroscopic center and when electron beam the ultra-Right or left hand edge of fluoroscopic useful scanning area and on or the voltage difference between the dynamic focus voltage of bottom down.
In the present invention, when electron beam is subjected to deflection, electron beam particularly can be suppressed because the spherical aberration effect that the horizontal expansion effect at main lens of the quadrupole lens that forms between the first focusing flat plate electrode 35 and second focusing electrode 40 causes because the expansion that the electric current increase causes can suppress by the effect of accelerating electrode 20 by the condenser lens of strengthening.
Though the quadrupole lens effect that forms between the first focusing flat plate electrode 35 and second focusing electrode 40 is owing to the minimizing to the ratio of the diameter of quadrupole lens of the diameter of electron beam reduces, beam diameter in the magnetic deflecting field also can reduce, the aberration that is caused by magnetic deflecting field (quadrupole lens) can reduce, and the unbalanced correction between level and the vertical magnification ratio can keep getting off.
When electron-beam deflection amount increases, first focusing electrode 30, the first focusing flat plate electrode 35 and the 3rd current potential that focuses on electrode 50 become than the current potential height of second focusing electrode, shown in Figure 16 B, the divergent lens of vertical elongated is formed by the slit 36,37 and 38 of the vertical elongated of the first focusing flat plate electrode 35, and electron beam is subjected to the disperse function (F strong than vertical direction in the horizontal direction
h＞F
v), thereby its cross section is subjected to horizontal extension.
Aforementionedly make quadrupole lens electric field that the electron beam vertical elongated uses by the parallel-plate (vertical panel) 44,45,46 in second focusing electrode 40 and 47 and be fixed on the 3rd parallel-plate (level board) that focuses on the electrode 50 and form, the 3rd potential difference that focuses between electrode 50 and the anode 60 descends, and the focussing force of main lens dies down.
The homogeneous because the diameter of quadrupole lens and to be compared by the electron beam of the horizontal extension that formalizes between the first focusing flat plate electrode 35 and second focusing electrode be big, electric current distribution become.What the flat electron beam that extends that supplies water was used is auxometric unbalanced by between second focusing electrode 40 and the 3rd focusing electrode 50, and by proofreading and correct between the 3rd focusing electrode 50 and the anode.
According to the present invention, can on whole phosphor screen, obtain satisfied definition.
As mentioned above, according to the present invention, when electron beam is not subjected to deflection, be subjected to the level that equates and the effect of vertical lens magnification ratio that focus on the main lens between electrode and the anode the 3rd by the electron beam of cathode emission, making electron-beam point become almost is true circle and little shape.
When the amount of deflection of electron beam increases, owing to be formed on horizontal divergence and vertical focusing effect that the quadrupole lens of first focusing electrode and second focusing electrode applies, electron beam extends in the horizontal direction, then, focus on imbalance between the power of lens that vertical divergence that the quadrupole lens between the electrode applies and horizontal focusing effect corrected vertical and level owing to being formed on second focusing electrode and the 3rd.
According to the present invention, can on the whole phosphor screen of brightness from high to low, obtain satisfied definition.
Claims (5)
1. a color cathode ray tube has electron gun, and electron gun is axially comprising at least one negative electrode, a control electrode, an accelerating electrode, a focusing electrode and an anode at interval by order, and its improvement comprises:
Said focusing electrode comprises at interval by order: first focusing electrode, second focusing electrode and the 3rd focus on electrode, and said first focusing electrode is towards said accelerating electrode,
One first quadrupole structure is formed on said first focusing electrode and a part of said second focusing electrode towards said first focusing electrode of at least a portion towards said second focusing electrode, and
One second quadrupole structure is formed at least a portion and focuses on electrode towards the 3rd said second focusing electrode and a part that focuses on electrode towards the said the 3rd of said second focusing electrode.
2. according to the cathode ray tube of claim 1, wherein said first focusing electrode and the said the 3rd focuses on electrode and is connected to each other in said color cathode ray tube.
3. color display system that comprises color cathode ray tube, said color cathode ray tube has electron gun, electron gun is axially comprising at least one negative electrode, a control electrode, an accelerating electrode, a focusing electrode and an anode at interval by order, and its improvement comprises:
Said focusing electrode comprises at interval by order: first focusing electrode, second focusing electrode and the 3rd focus on electrode, and said first focusing electrode is towards said accelerating electrode,
One first quadrupole structure is formed on said first focusing electrode and a part of said second focusing electrode towards said first focusing electrode of at least a portion towards said second focusing electrode, and
One second quadrupole structure is formed at least a portion and focuses on electrode towards the said the 3rd said second focusing electrode and a part that focuses on electrode towards the said the 3rd of said second focusing electrode,
Wherein changes in deflection a to dynamic focus voltage that is higher than the voltage that adds to said second focusing electrode with electron beam is added to the said first and the 3rd focusing electrode, make said first quadrupole structure produce horizontal divergence and vertical focusing effect to electron beam, said second quadrupole structure produces horizontal focusing and vertical divergence effect to electron beam.
4. according to the color display system of claim 3, wherein dynamic difference focus voltage and the voltage A that adds to said accelerating electrode and measure with respect to said control electrode
vSelect to such an extent that satisfy following inequality:
0.2≤Dv/Av≤4
Said dynamic difference focus voltage is the voltage difference between following, i.e. voltage difference between the dynamic focus voltage of electron beam when the corner that the dynamic focus voltage and the electron beam of the fluoroscopic center of said color cathode ray tube is deflected to said fluoroscopic useful scanning area.
5. according to the color display system of claim 3, the voltage that wherein is added on the said control electrode is in-150 to 0V scopes,
The voltage that is added to said accelerating electrode is in 200 to 1000V scopes,
The voltage that is added to said second focusing electrode is in 4 to 10KV scope,
The voltage that is added to said anode is in 23 to 30KV scope, and
Being added to the said first and the 3rd voltage that focuses on electrode is to add in the scope that is added to the voltage on said second focus voltage at the dynamic difference focus voltage,
The said scope of dynamic difference focus voltage is in 200 to 800V scope, and
Said dynamic difference focus voltage is the poor of following two voltages, promptly electron beam when the phosphor screen center of said colored canal ray tube dynamic focus voltage and electron beam be deflected the useful scanning area of said phosphor screen the corner time moving note focus voltage between voltage difference.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6291325A JPH08148095A (en) | 1994-11-25 | 1994-11-25 | Electron gun and color cathode-ray tube provided with this electron gun |
| JP291325/94 | 1994-11-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1130302A true CN1130302A (en) | 1996-09-04 |
Family
ID=17767455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95119692A Pending CN1130302A (en) | 1994-11-25 | 1995-11-24 | Colour display system by using quadrupole lens |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0714115A3 (en) |
| JP (1) | JPH08148095A (en) |
| KR (1) | KR960019453A (en) |
| CN (1) | CN1130302A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1846292B (en) * | 2003-09-03 | 2010-11-24 | 艾克塞利斯技术公司 | Unipolar electrostatic quadrupole lens and switching methods for charged beam transport |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5936338A (en) * | 1994-11-25 | 1999-08-10 | Hitachi, Ltd. | Color display system utilizing double quadrupole lenses under optimal control |
| JP2000156178A (en) * | 1998-11-20 | 2000-06-06 | Toshiba Corp | Cathode-ray tube |
| TW446984B (en) * | 1999-01-26 | 2001-07-21 | Toshiba Corp | Color cathode ray tube device |
| KR100384675B1 (en) * | 2000-11-28 | 2003-05-22 | 가부시키가이샤 히타치세이사쿠쇼 | Color image receiving tube |
| KR20030033217A (en) * | 2001-10-19 | 2003-05-01 | 삼성에스디아이 주식회사 | Electron gun for the cathode ray tube with unipotential and bipotential lens |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0640468B2 (en) | 1985-09-09 | 1994-05-25 | 松下電子工業株式会社 | Color picture tube device |
| JP2645061B2 (en) * | 1988-03-11 | 1997-08-25 | 株式会社東芝 | Color picture tube equipment |
| JPH07134953A (en) * | 1993-11-09 | 1995-05-23 | Hitachi Ltd | Color picture tube |
-
1994
- 1994-11-25 JP JP6291325A patent/JPH08148095A/en active Pending
-
1995
- 1995-11-16 EP EP95118059A patent/EP0714115A3/en not_active Withdrawn
- 1995-11-24 CN CN95119692A patent/CN1130302A/en active Pending
- 1995-11-25 KR KR1019950043776A patent/KR960019453A/en active IP Right Grant
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1846292B (en) * | 2003-09-03 | 2010-11-24 | 艾克塞利斯技术公司 | Unipolar electrostatic quadrupole lens and switching methods for charged beam transport |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0714115A3 (en) | 1997-07-16 |
| KR960019453A (en) | 1996-06-17 |
| JPH08148095A (en) | 1996-06-07 |
| EP0714115A2 (en) | 1996-05-29 |
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