CN1073274C - Electron gun for a color picture tube - Google Patents
Electron gun for a color picture tube Download PDFInfo
- Publication number
- CN1073274C CN1073274C CN94120773A CN94120773A CN1073274C CN 1073274 C CN1073274 C CN 1073274C CN 94120773 A CN94120773 A CN 94120773A CN 94120773 A CN94120773 A CN 94120773A CN 1073274 C CN1073274 C CN 1073274C
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- Prior art keywords
- grid
- electron gun
- hole
- centre bore
- circular port
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- 238000010894 electron beam technology Methods 0.000 claims abstract description 33
- 201000009310 astigmatism Diseases 0.000 claims abstract description 8
- 239000006185 dispersion Substances 0.000 claims 1
- 239000011521 glass Substances 0.000 description 4
- 239000011324 bead Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000001151 other effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
一种用于彩色显象管的一字形电子枪。在传统结构的电子枪中具有用于补偿象散的四极透镜，但栅极不能容易地固定，从而影响电子枪的对准；在本发明中，两相邻栅极的中心和侧电子束通过孔以圆形孔和伸长孔方式交替排列，从而自动地保持电子枪组件的对准。
An in-line electron gun used in color picture tubes. In the electron gun of traditional structure, there is a quadrupole lens for compensating astigmatism, but the grid cannot be easily fixed, thereby affecting the alignment of the electron gun; in the present invention, the center and side electron beams of two adjacent grids pass through holes Alternate circular holes and elongated holes to automatically maintain the alignment of the electron gun assembly.
Description
The present invention relates to a kind of chromoscope, more particularly relate to the electron gun of chromoscope, this electron gun has a plurality of word order formula grids that constitute quadrupole lens.
Cathode ray tube is a kind of device that is used for displayed image, and it forms electron beam by focusing on and quickening by the electronics that negative electrode produces, and makes electron beam optionally clash into the scanning phosphor screen by arrangement for deflecting.
Electron gun is used to form electron beam.What adopt usually is the electrostatic electron gun, and it is by the electrostatic lens focused beam, and these electrostatic lens are formed by potential difference between a plurality of grids that are added with different voltages separately.
On each grid of electron gun, be formed with for treating that the bundle that controlled electron beam passes through passes through the hole.In black and white (B/W) rifle, adopt the circle lens of circular hole and corresponding formation usually.
Because the boundary condition of each electron beam R, G and B differs from one another, when electron beam when having the electron gun of three bundles by the chromoscope in hole, can produce serious spherical aberration and astigmatism.For example, the main lens of high brightness chromoscope is made Large Aperture Lenses, and wherein, three electron-beam is by a big public through hole, so that reduce spherical aberration.Because this particularity of its shape, this class main lens has its intrinsic astigmatism, the resolution variation that this causes hitting screen bundle point deformation and makes picture tube.
When the horizontal component and the vertical component of electron beam, when promptly horizontal beam and perpendicular fasciculus focus on varying strength respectively, just can produce astigmatism.Mean that just as loosing the focusing of perpendicular fasciculus is better than horizontal beam, reversed image looses and then represents reverse situation.
Can compensate astigmatism by forming at least one quadrupole lens with astigmatism opposite with electron gun.Compare with the round lens that all electron beams is focused into a bit, quadrupole lens is commonly referred to as non-rotating symmetric lens, its focused beam by different way in the pairwise orthogonal plane.
Simultaneously, arrangement for deflecting as deflecting coil, is used to make electron beam scanning.A self-convergent system deflecting coil forms the deflection field that has just as loosing, thereby causes deflection defocusing and make the shape distortion of bundle point.In other words, the vertical component of electron beam be perpendicular fasciculus be deflected coil just as the focusing of loosing.This mistake focuses on and can compensate by adopting moving focused electron rifle, and in this electron gun, the intensity of main lens and quadrupole lens changes synchronously with deflection, thereby makes the bundle point focusing and be shaped as round again.
With reference to Fig. 1, by the electron beam through-hole H of horizontal or vertical elongation is set on each of two adjacent grid E1 ' and E2 '
vOr H
h, form a typical quadrupole lens.Each hole H of two grid E1 ' and E2 '
vOr H
hVertically or flatly form with parallel arrangement mode.When the hole of vertical elongated is formed at that high potential lens (electrode) are gone up or is formed at electronegative potential lens (electrode) when going up when the hole of horizontal extension, the quadrupole lens that forms between its (electrode) has just as diffusing.Say for example, if E1 ' expression high potential grid, E2 ' expression electronegative potential grid, what form between grid E1 ' and the E2 ' so is just as the quadrupole lens that looses.Simultaneously, at hole H
vAnd H
hPeripheral edge portion be formed with the flange f that is used to control electrical field shape.
By thermal welding grid E1 ' and E2 ' are fixed on the glass bar of so-called bead glass, are assembled into electron gun thus.In assembling process, each grid E1 ' and E2 ' at first pass through at each electron beam through-hole H
vAnd H
hInsert the core bar of assembly fixture and interim maintenance, and then assemble with bead glass.
With reference to Fig. 2, three core bar P of preparation on an assembly fixture (not shown), and with each grid E1 ' and E2 ' preface along insertion on it.Because most of grid of electron gun has circular electron beam through-hole, so core bar P also makes circular cross-section.In the termination direction towards each core bar, its diameter reduces by rank, because along with close negative electrode, the diameter of electron beam through-hole progressively diminishes.
Simultaneously, be used to form the grid E1 ' of quadrupole lens and the hole H that E2 ' has horizontal or vertical elongation
vOr H
h, and can not be seated in the core bar P of circular cross-section.As shown in Figure 2, the hole H that has vertical elongated
vUpper gate E1 ' can move forward and backward and hole H with horizontal extension
hBut bottom grid E2 ' move left and right, thereby the alignment of the electron gun of infringement assembling.The misalignment of electron gun not only makes colorimetric purity and resolution reduce, and can make the electrostatic lens distortion.For anti-problem here, need an additional hard-cover hole and guide post or an external orientation device.
Therefore, an object of the present invention is to provide a kind of electron gun of chromoscope, this electron gun can form the quadrupole lens that maintenance (each grid) is aimed at.
Another object of the present invention is that a kind of electron gun that can easily make will be provided.
For realizing main purpose of the present invention, the electron gun of such chromoscope is provided, it has at least one and is formed at quadrupole lens between a pair of neighboring gates, forms three respectively by word order mode electron beam through-hole at this on to grid, and this electron gun is characterised in that:
A grid in adjacent two grids comprises the side opening of a round center hole and two elongations; And
Another grid comprises the centre bore of an elongation and the side opening of two circles.
On these two neighboring gates, be applied with different voltage.When the quadrupole lens that forms betwixt has when diffusing, if the centre bore of high potential grid is a vertical elongated, two side holes is a circle, and the centre bore of relative electronegative potential grid and two side holes are respectively round and horizontal extension.Otherwise if the centre bore of high potential grid is round, two side holes then is a vertical elongated, the centre bore of electronegative potential grid and two side holes be respectively horizontal extension with circle.
For realizing another object of the present invention, be used for the shape that elongated hole of the present invention preferably adopts the part circle.And, substitute the flange that forms at the electron beam through-hole periphery with the off-centring preset distance of two side holes.
From the following detailed description that the reference accompanying drawing is done, can more be expressly understood these and other objects of the present invention and advantage, in the accompanying drawing:
Fig. 1 is a plane graph, and the neighbour that it illustrates two routines that are used to form quadrupole lens puts grid;
Fig. 2 is a perspective view, and the grid that it illustrates Fig. 1 inserts on the core bar;
Fig. 3 is a plane graph, and it illustrates two neighbours that are used to form quadrupole lens according to the present invention and puts grid;
Fig. 4 is a perspective view, and the grid that it illustrates Fig. 3 inserts on the core bar;
Fig. 5 A-5E is a plane graph, and it illustrates the shape that is used for electron beam through-hole of the present invention respectively;
Fig. 6 is a phantom, and it illustrates the electron gun that constitutes according to the present invention;
Fig. 7 is the plane graph of projection, and it exemplifies out the layout and the size of the electron beam through-hole of grid shown in Figure 6.
With reference to Fig. 3, in the electron gun according to chromoscope of the present invention, electron beam through-hole H1C, H1S and H2C, the H2S of two adjacent grid E1 and E2 are given shape, to form quadrupole lens.
As shown in Figure 3, hole H1C, H1S or H2C, the H2S of each grid E1 or E2 are different, that is, the centre bore of a grid E1 or E2 and two side holes are different from centre bore and the two side holes of relative another grid E2 or E1 respectively.In other words, centre bore H1C and two side holes H1S can replace or different mode is selected in circular hole and elongated hole, and with respective aperture H2C, the H2S of relative grid E2 between be different relation.
If upper gate E1 adds high voltage and forms and be the high potential grid, and bottom grid E2 is the electronegative potential grid, and between grid E1 and E2, form just as the quadrupole lens that looses.If the centre bore H1C of high potential grid E1 is a vertical elongated, two side holes H1S should be circular.On the contrary, the centre bore H2C of electronegative potential grid E2 is circular, and two side holes H2S is a horizontal extension.
According to said structure, by between the circular hole H2C of the centre bore H1C of the vertical elongated of high potential grid E1 and electronegative potential grid E2, forming quadrupole lens, can obtain just as loosing through the center electron beam of centre bore H1C and H2C.And by form quadrupole lens between the horizontal extension hole H2S of the circular hole H1S of high potential grid E1 and electronegative potential grid E2, each the side electron beam that passes two side holes H1S and H2S respectively also can obtain just as loosing.
As the centre bore H1C of high potential grid E1 when being circular, two side holes H1S is a vertical elongated, the centre bore H2C of electronegative potential grid E2 and two side holes H2S be respectively horizontal extension with circle.
When forming the quadrupole lens that reversed image looses between two grid E1 and E2, top explanation will become opposite.
As mentioned above, in electron gun according to chromoscope of the present invention, by vertical elongated hole H1C being set in high potential grid E1 or in electronegative potential grid E2, the horizontal extension hole being set, and on the grid circular hole H2C, H1S are being set relatively, between two grid E1 and E2, formed the quadrupole lens that has just as loosing.The intensity of the quadrupole lens that is formed by the present invention roughly is equivalent to half of intensity of existing quadrupole lens shown in Figure 1.
According to the present invention, the alignment of electron gun structure obviously improves.When by bead glass assembling grid E1 and E2,, among core bar P insertion electron beam through-hole H1C, H1S, H2C and the H2S with assembly fixture, thereby grid E1 and E2 temporarily are positioned on the core bar P as shown in Figure 4.In the hole of grid E1 and E2 H1C, H1S, H2C and H2S, hole H1C, the H2S of circular hole H1S, H2C and horizontal or vertical elongation are mixings, grid E1 and E2 can be not by therebetween arbitrary plane and be supported on the core bar P.Therefore, this electron gun can not realized the assembling of good alignment by means of any additional guider.
With reference to Fig. 5 A-5E, list the different shape of the hole H of the electron beam through-hole that is used as elongation of the present invention here.
Fig. 5 A is an elliptical aperture, and Fig. 5 B is a rectangular opening, and Fig. 5 C is key shape hole, and Fig. 5 D is the part circular hole, and Fig. 5 E is the round end stomidium.
The characteristic of each elongated hole H when following table 1 has been listed as electron beam through-hole.
Table 1
| Hole shape | Make | Alignment | Optical property |
| The round head end of oval square key bore portion | The difficulty or ease difficulty or ease are easy | Unidirectional two-way unidirectional | Preferably the poorest getting well carefully |
In this table, the direction that is tied of the motion in the hole that alignment is a fingerstall to the core bar P.Except that keyhole, all other Kong Jun have unidirectional alignment.
Grid E1 and E2 make like this: die-cut blanking, and the deep-draw metal stock, and punching press forms the hole H as electron beam through-hole.Consider that from the manufacturing process aspect rectangle Kongzui is made easily, but focus characteristics (optical characteristics) is bad.On the contrary, elliptical aperture presents best optical characteristics, but makes difficulty.And best alignment has been realized in keyhole type hole, is difficult for also making.
Therefore, be used for according to the shape of the electron beam through-hole of the electron gun structure of the present invention circle of the part shown in Fig. 5 D preferably.Part circle is to be that the preset width that its diameter of round upper edge of R intercepts is the zone of h at radius.
By the two ends of rectangular opening being made the hole of the blunt end shown in the circular-arc Fig. 5 E that forms, can be used from the present invention with part circular hole one.
On the edge of electron beam through-hole, can prepare a flange, so that by shielded side wall effect or other effect control electric field.Compare with rectangle or circular port, the preparation flange is much more difficult on ellipse, part circular or blunt end shape hole.
Therefore, the present invention chooses and takes to make the mode of two side holes off-centring preset distance to substitute the preparation flange, with shielded side wall effect or other harmful effect.
With reference to Fig. 6 and 7, the actual design example according to an electron gun of the present invention is shown here.
In Fig. 6 and 7, each grid G 4-G6 forms by two cup-shaped grid part, at the access panel G51 of the exit plate G43 of grid G 4 and grid G 5 and between the access panel G61 of the exit plate G53 of grid G 5 and grid G 6, forms quadrupole lens Q1 and Q2 respectively.The influence that is formed for compensating the following fact of quadrupole lens Q1 and Q2, that is, the intensity of quadrupole lens Q1 of the present invention and Q2 is equivalent to half of existing quadrupole lens intensity shown in Figure 1.
Apply focus voltage VF1 and VF2 on grid E1 and the E2 respectively, voltage VF1 (for example) is 6600V, and it puts on grid G 4 and G6 jointly, and 7800 volts voltage VF2 adds to grid G 5.Therefore, grid G 5 is the high potential grid, and grid G 4 and G6 are the electronegative potential grid.
The unit of the numeral shown in the accompanying drawing is mm.R represents that circular electron beam passes through the radius (being its basic radius of a circle) of the radius of hole H43s, H51c, H53c, H61s and part circular hole H43c, H51s, H53s, H61c.Symbol h represents the width of part circular hole H43c, H51s, H53s and H61c.
Other that does not mark among the figure is of a size of (mm of unit):
Distance between the grid: G:0.8
The thickness of grid: T:0.4
Grid length: D:4.2
Gate height: H:5.4
Interfascicular is every S:6.6
Wherein interfascicular is represented by the distance between the electron beam central shaft of three electron beam through-holes every S, therefore be also referred to as the electron gun between centers every.
In the accompanying drawings, the central shaft of side opening H51s, the H53c that forms on the access panel G51 of grid G 5 and exit plate G53 outwards is offset preset distance Δ S from the central shaft of electron gun structure, and 0.3mm for example is with the shielded side wall effect.
According to the present invention, the electron gun that is provided has the quadrupole lens that is used for compensating effectively astigmatism, and makes and assemble easily, and (each grid) accurately aimed at.
Claims (10)
1. color display tube electron gun comprises:
Two neighboring gates pass three electron beams in hole and arrange in a line respectively on it; And
Have at least a quadrupole lens to be formed between described two adjacent grids, the first grid of wherein said two neighboring gates comprises the side opening of a round center hole and two elongations, and second grid of described two neighboring gates comprise centre bore and two circular side openings of an elongation.
2. electron gun as claimed in claim 1 is characterized in that being added with different voltage respectively on each described two neighboring gates, they are divided into high pressure grid and low pressure grid.
3. electron gun as claimed in claim 2, when the centre bore that it is characterized in that described first grid was vertical elongated, described two side openings were circular port; And
The centre bore of described second grid and two side openings are respectively a circular port and horizontal extension hole.
4. electron gun as claimed in claim 2, when the centre bore that it is characterized in that the described first grid was circular port, described two side openings were vertical elongated holes, and
The centre bore of described second grid and two side openings are respectively horizontal extension hole and circular port.
5. electron gun as claimed in claim 1 is characterized in that the described quadrupole lens that is formed between the described two adjacent grids has the astigmatism relative with main lens, or the deflection field chromatic dispersion.
6. when electron gun as claimed in claim 5, the centre bore that it is characterized in that described first grid were vertical slotted hole, described two side holes was a circular port, and
The centre bore of described second grid and two side openings are respectively circular port and horizontal extension hole.
7. electron gun as claimed in claim 5, when the centre bore that it is characterized in that the described first grid was circular port, described two side holes was the vertical elongated hole, and
The described centre bore and the two side holes of described second grid are respectively horizontal extension hole and circular port.
8. electron gun as claimed in claim 1 is characterized in that described elongated hole forms as elliptical aperture, rectangular opening or key shape hole.
9. electron gun as claimed in claim 1 is characterized in that described elongated hole is the part circular hole, and it is to obtain by carrying the interior section of getting preset width, or the round end stomidium, and it is to be trimmed to by the two ends with rectangular opening.
10. electron gun as claimed in claim 1 is characterized in that side shaft one preset distance of the described electron gun of off-centring of two side openings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94120773A CN1073274C (en) | 1994-12-31 | 1994-12-31 | Electron gun for a color picture tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN94120773A CN1073274C (en) | 1994-12-31 | 1994-12-31 | Electron gun for a color picture tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1125894A CN1125894A (en) | 1996-07-03 |
| CN1073274C true CN1073274C (en) | 2001-10-17 |
Family
ID=5039515
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN94120773A Expired - Fee Related CN1073274C (en) | 1994-12-31 | 1994-12-31 | Electron gun for a color picture tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1073274C (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4814670A (en) * | 1984-10-18 | 1989-03-21 | Matsushita Electronics Corporation | Cathode ray tube apparatus having focusing grids with horizontally and vertically oblong through holes |
| CN1096903A (en) * | 1993-05-14 | 1994-12-28 | 东芝株式会社 | color picture tube |
-
1994
- 1994-12-31 CN CN94120773A patent/CN1073274C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4814670A (en) * | 1984-10-18 | 1989-03-21 | Matsushita Electronics Corporation | Cathode ray tube apparatus having focusing grids with horizontally and vertically oblong through holes |
| CN1096903A (en) * | 1993-05-14 | 1994-12-28 | 东芝株式会社 | color picture tube |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1125894A (en) | 1996-07-03 |
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