CN1230862C - Electronic gun for colour kinescope - Google Patents
Electronic gun for colour kinescope Download PDFInfo
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- CN1230862C CN1230862C CN 01139213 CN01139213A CN1230862C CN 1230862 C CN1230862 C CN 1230862C CN 01139213 CN01139213 CN 01139213 CN 01139213 A CN01139213 A CN 01139213A CN 1230862 C CN1230862 C CN 1230862C
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Abstract
The present invention relates to an electron gun for a colour kinescope. The present invention comprises electrodes which are composed of three cathodes orderly arrayed in a line along the axis of the electron gun, a modulating electrode and a prefocus lens, a static focusing electrode, a dynamic focusing electrode and an anode, wherein on an entry plane surface positioned at the dynamic focusing electrode, three discrete horizontal wing panels extending towards the direction of each cathode are arranged at the upper and the lower sides of clearing holes of electronic beams; on the static focusing electrode, each hole of each electronic beam presents an elliptical shape; scheduled focusing voltage Vf is arranged on the static focusing electrode in a mode of superimposition, and dynamic focusing voltage Vfd is additionally arranged on the dynamic focusing electrode. When the dynamic focusing voltage is positioned at the center of a screen, the dynamic focusing voltage is equal to static focusing voltage; when the electron beams scan the rim angle of the screen, the dynamic focusing voltage is greater than the static focusing voltage. The electron gun of the present invention is installed on a kinescope neck part of the kinescope so as to play the effect on the emission of electrons. The electron gun of the present invention can correct and compensate the problem of the astigmatism of the electron beams, which is caused by deflecting auto-convergence fields, and uniform electron beam points can be obtained on the entire screen; the structure is easy to realize technologically.
Description
Technical field
The present invention relates to color picture tube, particularly a kind of electron gun that is used for color picture tube.
Background technology
In general, the definition of color picture tube depends on the size and dimension of getting to the electron beam on the screen.In order to obtain the image of high definition, the size of getting to the electron beam on the screen should be as far as possible little little with warpage.Yet for the common color picture tube, for the effect of auto-convergence, the electron gun in-line of three electron beams of emission is arranged, and horizontal deflection is the pincushion field, and vertical deflection is the barrel field, so just makes electron beam produce very big distortion.As shown in Figure 1, the electron beam 103 of getting to 100 4 jiaos of panels has the fuzzy part 101 of very bright nuclear 102 and low-light level, the astigmatism in Here it is the electron beam.Owing to this detrimental effect, influenced the resolution of colored picture tube.
Referring to Fig. 2 to Fig. 4, this technical scheme comprises a static focus electrode 361 and a dynamic focus electrode 362, pass through the hole for two electrode adjacent electron beam, electron beam through-hole 351 on the electron beam through-hole 352 relative static focus electrode on the dynamic focus electrode 362, be that level is elongated and the shape of vertical compression, static focus voltage Vf and dynamic focus voltage Vfd are added to respectively on static focus electrode 361 and the dynamic focus electrode 362.Dynamic focus voltage Vfd and defection signal are synchronous.
When using electrode structure shown in Figure 2, when electron beam projected the screen center, the voltage of static focus electrode and dynamic focus electrode was consistent, and did not have the active force of lens between two electrodes; When the electron beam deflecting to screen four jiaos the time, voltage Vfd on the dynamic focus electrode increases along with the deflection of electron beam, voltage Vf on the static focus electrode then remains unchanged, like this, two electrodes have formed the quadrupole field effect of positive astigmatism, be strong horizontal convergence power and strong vertical divergence power, so that formed the elongation in vertical direction of electron beam cross section, the adverse effect that the deflection negative-appearing image looses has just in time been offset in this effect, make that the beam shapes that projects four jiaos obtains proofreading and correct, beam spot is rounded.
For above-mentioned electron gun structure, though partly solved the aforementioned problem that proposes, exist certain defective, i.e. a segment distance because static focus electrode and dynamic focus electrode are separated by, make quadrupole field deform, thereby brought certain negative interaction inevitably.
Fig. 5 has provided to solving another color picture tube example that the aforementioned astigmatism problem that proposes designs.Referring to Fig. 5, structure shown in the figure comprises a static focus electrode 461 and a dynamic focus electrode 462, electron beam through-hole in dynamic focus electrode 462 has two horizontal fins 452 in both sides up and down, and each side have 451, one static focus voltage Vf of vertical fin and dynamic focus voltage Vfd to be added to respectively on static focus electrode and the dynamic focus electrode at the electron beam through-hole of static focus electrode 461.Dynamic focus voltage Vfd and defection signal are synchronous.
When using electrode structure shown in Figure 5, the action principle of its action principle and structure shown in Figure 2 is basic identical, can play the adverse effect that the correction deflector negative-appearing image looses equally.The effect difference of Fig. 5 and structure shown in Figure 2 is that the quadrupole field of structure shown in Figure 5 does not have the quadrupole field distortion, but structure shown in Figure 5 exists the problem that technology realizes difficulty.
Summary of the invention
Task of the present invention provides a kind of improved electron gun that is used for color picture tube, and it can keep good manufacturability, proofreaies and correct and solved the caused astigmatism problem of deflecting coil deflection beam well, makes whole panel form good luminous point.
Technical scheme of the present invention is as follows:
A kind of electron gun that is used for color picture tube, it comprises three negative electrodes that are arranged in order into delegation along electron gun axis, Wehnelt electrode, the composition electrode of prefocus lens, a static focus electrode, dynamic focus electrode and anode are being positioned at the injecting on the plane of dynamic focus electrode, and three discrete horizontal fins that extend towards cathode direction are arranged on the both sides up and down of electron beam through-hole; On static focus electrode, the hole shape of electron beam is set to elliptical shape, and a predetermined focus voltage Vf is superimposed upon on the static focus electrode, and a dynamic focus voltage Vfd then is added on the dynamic focus electrode; When dynamic focus voltage at screen during the center, dynamic focus voltage equates with static focus voltage, when electron beam scanning when shielding the corner, dynamic focus voltage is greater than static focus voltage.
Electron gun of the present invention is installed on the neck part of picture tube, has played the effect of emitting electrons.The electron beam astigmatism problem that causes owing to deflection auto-convergence field can be proofreaied and correct and compensate to the electron gun that is used for color picture tube of the present invention, make to obtain uniform electron-beam point on whole phosphor screen, and this structure is easy to realize on technology.
Description of drawings
Electron beam projected the formed beam shapes schematic diagram of panel of color picture tube when Fig. 1 was to use the conventional electrical rifle.
Fig. 2 is expressed as an example of the prior art that solves deflection astigmatism problem and use.
Fig. 3 is the electron beam through-hole schematic diagram on the dynamic focus electrode in Fig. 2 technology.
Fig. 4 is the electron beam through-hole schematic diagram on the static focus electrode in Fig. 2 technology.
Fig. 5 is expressed as another example of the prior art that solves deflection astigmatism problem and use.
Fig. 6 is that a kind of structural representation and voltage that is used for the electron gun of color picture tube of the present invention applies schematic diagram.
Fig. 7 is the front view of three horizontal fins in Fig. 6 electron gun.
Fig. 8 is by left view shown in Figure 7.
Fig. 9 is by vertical view shown in Figure 7.
Figure 10 is the electron beam central hole structure front view in Fig. 6 electron gun.
Figure 11 is the electron beam limit beam hole structural front view in Fig. 6 electron gun.
Figure 12 represents electron gun quadrupole field Electric Field Distribution of the present invention and electron beam suffered force diagram in this electric field.
Embodiment
Referring to the embodiment of Fig. 6, the electron gun that is used for color picture tube of the present invention is installed in the neck and the heat of emission electronics of color picture tube.A kind of electron gun that is used for color picture tube of the present invention comprises three negative electrodes 20 that are arranged in order into delegation along electron gun axis, Wehnelt electrode 21, the composition electrode of prefocus lens 251, one dynamic focus electrode 252 of 22,23,24, one static focus electrode and anode 26.
Be positioned at the injecting on the plane of dynamic focus electrode 252, three discrete horizontal fins 321 that extend towards cathode direction are arranged on the both sides up and down of electron beam through-hole.
Referring to Fig. 7 to Fig. 9, on dynamic focus electrode 252, the length of three discrete horizontal fins 321 is consistent, and the width 421 of each sheet independence fin is less than the diameter of the electron beam through-hole 422 that links to each other with it.
Referring to Figure 10 and Figure 11, on static focus electrode 251, the hole shape of electron beam is set to elliptical shape.On static focus electrode 251, the mesopore 311 of three electron beam through-holes is the elliptical aperture of major axis in vertical direction, the limit beam hole 312 of three electron beam through-holes is the combination of two semiellipse arcs, wherein the major axis near half ellipse arc 411 of middle bundle is positioned at vertical direction, and is positioned at horizontal direction away from the major axis of half ellipse arc 412 of middle bundle.
A predetermined static focus voltage Vf is superimposed upon on the static focus electrode 251, and a dynamic focus voltage Vfd then is added on the dynamic focus electrode 252.When dynamic focus voltage at screen during the center, dynamic focus voltage equates with static focus voltage, when electron beam scanning when shielding the corner, dynamic focus voltage is greater than static focus voltage.
This electron gun has used the compound mode of static focus electrode 251 and 252 two electrode structures of dynamic focus electrode.
Be used for the electron gun duration of work of color picture tube, the voltage that is added on each electrode is as described below:
Voltage 0～the 120V of negative electrode 20; Voltage 0～the 1000V of intensifying ring 22; Anode 26 voltage Va are 25～35kV; Static focus electrode 251 voltages are 25%～30% of anode voltage Va; The voltage of dynamic focus electrode 252 is the dynamic focus voltage of the 0.5～1.5kV that superposes on the basis of static focus voltage Vf.The defection signal of this dynamic focus voltage and deflecting coil changes synchronously.
Below the course of work that is used for the electron gun of color picture tube of the present invention is described.
When predetermined voltage was added on each electrode of the electron gun that is used for color picture tube of the present invention, three electrodes 22,23,24 formed prefocus lenss.If dynamic focus voltage Vfd is added on the dynamic focus electrode 252, then between static focus electrode 251 and dynamic focus electrode 252, formed a quadrupole lens.Between dynamic focus electrode 252 and anode 26, form main lens.
The electronics that goes out from cathode emission projects phosphor screen everywhere after through the acceleration of each electrode and focussing force.The projection state of electron beam can be divided into two kinds of situations:
One, electron beam throws fluoroscopic center.
Two, electron beam projects the position of four jiaos of screens.
At first, when electron beam when gun cathode 20 projects the screen center, voltage on the dynamic focus electrode and the voltage on the static focus electrode are consistent, and do not form Quadrupole Lens between electrode slice 310 and the horizontal fin 321.The electronics that negative electrode 20 sends passes through the convergence and the focusing of main lens then through the preliminary acceleration and the focusing of pre-lens, therefore obtains good beam spot at the screen center.
When the electron beam that goes out when cathode emission projects four jiaos of screens, static focus voltage Vf is applied on the static focus electrode 251, dynamic focus voltage Vdf is applied on the dynamic focus electrode 252, therefore has potential difference between horizontal fin 321 and electrode slice 310, thereby has formed Quadrupole Lens.Therefore, electron beam that negative electrode 20 sends is subjected to the quadrupole field effect of positive astigmatism after quickening and focus on through prefocus lens between horizontal fin 321 and electrode slice 310, thereby in the outlet of electron gun, electron beam is the shape of vertical elongation.This electron beam projects the circular point that is shaped as of four jiaos of phosphor screens after the diffusing effect of negative-appearing image of overshoot.
Referring to Figure 12, the potential difference between electrode 511, electrode slice 310 and the horizontal fin 521 has formed the quadrupole field effect of positive astigmatism, and promptly electron beam has been subjected to the active force of level compression and stretched vertically.As can see from Figure 12, horizontal fin 521 is divided into three, and independently the length of fin 421 is less than the diameter of the electron beam through-hole 422 that links to each other with it, this structure can be so that electrode 511 can play the effect of penetration of electric field, the assurance quadrupole field is indeformable, and the middle electron beam 517 and the electron beam 518 on both sides are subjected to close active force.Electrode slice 310 is set, in the middle of can making and the electron beam on both sides be subjected to the active force of identical electron beam, guarantee that simultaneously the electron beam centrode on the both sides of this structure remains unchanged.The enforcement of this structure, keeping under the indeformable situation of quadrupole field on the one hand, the detrimental effect that the deflection negative-appearing image looses when having proofreaied and correct the electron beam deflecting to four jiaos of screens has well overcome the detrimental effect of vertical fin in the prior art structure on the other hand, has improved the feasibility of technology.
As previously mentioned, at the electron gun that is used for color picture tube of the present invention,, thereby alleviated astigmatism because the electron beam distortion that the auto-convergence magnetic deflection field causes proofreaied and correct by the quadrupole field that the horizontal fin and the static focus electrode of dynamic focus electrode forms.In addition, the electron gun structure that is used for color picture tube of the present invention has improved the practicality of technology.
The present invention is not limited to narrate among the embodiment has the electron gun that three negative electrodes are in line, and it can be widely used in launching on the electron gun of single or multiple electron beam.
Claims (3)
1. electron gun that is used for color picture tube, it comprises three negative electrodes that are arranged in order into delegation along electron gun axis, Wehnelt electrode, the composition electrode of prefocus lens, a static focus electrode, dynamic focus electrode and anode is characterized in that, be positioned at the injecting on the plane of dynamic focus electrode, three discrete horizontal fins that extend towards cathode direction are arranged on the both sides up and down of electron beam through-hole; On static focus electrode, the hole shape of electron beam is set to elliptical shape, and a predetermined focus voltage (Vf) is superimposed upon on the static focus electrode, and a dynamic focus voltage (Vfd) then is added on the dynamic focus electrode; When dynamic focus voltage at screen during the center, dynamic focus voltage equates with static focus voltage, when electron beam scanning when shielding the corner, dynamic focus voltage is greater than static focus voltage.
2. the electron gun that is used for color picture tube according to claim 1 is characterized in that, on dynamic focus electrode, the length of three discrete horizontal fins is consistent, and the width of each sheet independence fin is less than the diameter of the electron beam through-hole that links to each other with it.
3. the electron gun that is used for color picture tube according to claim 1, it is characterized in that, on static focus electrode, the mesopore of electron beam through-hole is the elliptical aperture of major axis in vertical direction, the limit beam hole of electron beam through-hole is the combination of two semiellipse arcs, wherein the major axis near half ellipse arc of middle bundle is positioned at vertical direction, and is positioned at horizontal direction away from the major axis of half ellipse arc of middle bundle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01139213 CN1230862C (en) | 2001-12-26 | 2001-12-26 | Electronic gun for colour kinescope |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01139213 CN1230862C (en) | 2001-12-26 | 2001-12-26 | Electronic gun for colour kinescope |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1428811A CN1428811A (en) | 2003-07-09 |
| CN1230862C true CN1230862C (en) | 2005-12-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01139213 Expired - Fee Related CN1230862C (en) | 2001-12-26 | 2001-12-26 | Electronic gun for colour kinescope |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1230862C (en) |
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2001
- 2001-12-26 CN CN 01139213 patent/CN1230862C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1428811A (en) | 2003-07-09 |
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