CN1110061C - Double-beam electron gun having astigmatism compensaton for projection tube - Google Patents
Double-beam electron gun having astigmatism compensaton for projection tube Download PDFInfo
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- CN1110061C CN1110061C CN 99105543 CN99105543A CN1110061C CN 1110061 C CN1110061 C CN 1110061C CN 99105543 CN99105543 CN 99105543 CN 99105543 A CN99105543 A CN 99105543A CN 1110061 C CN1110061 C CN 1110061C
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- 201000009310 astigmatism Diseases 0.000 title claims description 17
- 230000004075 alteration Effects 0.000 claims abstract description 11
- 230000007246 mechanism Effects 0.000 claims abstract description 7
- 206010010071 Coma Diseases 0.000 claims abstract description 6
- 230000003287 optical effect Effects 0.000 claims abstract description 3
- 238000010894 electron beam technology Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 3
- 206010073261 Ovarian theca cell tumour Diseases 0.000 claims description 2
- 238000002474 experimental method Methods 0.000 claims description 2
- 239000011521 glass Substances 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 208000001644 thecoma Diseases 0.000 claims description 2
- 230000000007 visual effect Effects 0.000 claims description 2
- 230000009977 dual effect Effects 0.000 abstract 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
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Abstract
The present invention relates to a dual beam electron gun with astigmatic compensation, which is used for a projection tube. On the basis of the dual beam electron gun with high brightness and high resolution, the electron gun is provided with a compensation element of electron optics, which is used for reducing optical aberration, wherein the compensation element comprises a coma aberration compensation lens, a dynamic quadrupole field compensation lens and a soft magnetic sheet compensation mechanism, and the mechanisms effectively optimizes, compensates and corrects the aberration of cathode beams.
Description
The invention belongs to the electric vacuum display device field, specially refer to the double-beam electron gun that astigmatism compensation is arranged that projection tube is used.
The picture tube that is used for the high definition projection TV set can abbreviate projection tube as, and the chromoscope more used than general general television set has higher brightness and resolution.Here said high brightness is meant that the brightness than common picture tube doubles; Said high-resolution, be meant under same brightness, compare with single beam tube, resolution improves nearly about one times, in same device, relation between high brightness and the high-resolution is conflicting, in another patent of invention " projection tube high brightness; high-resolution double-beam electron gun " that we declare, illustrate, in order to overcome this contradiction, make projection tube possess high brightness and high-resolution simultaneously, the new departure that will adopt custom-designed two-beam or multibeam electron to annotate, promptly adopt the electron-optical system of the shared large cylinder of custom-designed two-beam, producing the two-beam or the multibeam electron that intersect annotates, improve the brightness of bundle spot on the screen exponentially, and obtain little beam spot size.But, for any electron-optical system, because the effect of paraxonic electronics, in the track of advancing, always exist astigmatism and multiple aberration, the quality of influence image in order to improve the definition and the fidelity performance of image, just need be carried out astigmatism compensation through track to electron beam in the electron-optical system.
Purpose of the present invention, the track to electron beam in the electron-optical system carries out astigmatism compensation exactly, reduces aberration, makes the spot resolution height of getting on the phosphor screen, and the edge of TV image and four jiaos reduce distortion, to obtain the high-quality picture.
The present invention relies on following technical proposals to realize, a kind of projection tube double-beam electron gun that astigmatism compensation is arranged, on the double-beam electron gun basis, the electron optics compensating element, that reduces optical aberration is set, it is characterized in that, set up the compensating diaphragm of two off-centre operation endoporus between first pole piece G3-1 in electron gun among the first anode G3 and the middle pole piece G3-2, constitute astigmatism and coma offset lens, what increase in middle pole piece G3-2 back that a slice is referred to as back pole piece G3-3 has a rectangle endoporus compensating diaphragm L2, it and both sides lay respectively at middle pole piece G3-2 rear end, two of tail pole piece G3-4 front end have rectangle endoporus compensating diaphragm L1, L3 has constituted a dynamic quadrupole field electrostatic lens jointly, compensation is at screen edge and four jiaos of aberrations that the place causes, to obtain minimum spot size, it is all visual clearly to reach whole image; In electron gun glass bulb neck outer rim, be with adjustable diskette, by the rotation of magnetic sheet position, constitute compensation mechanism, be used for regulating the centering of electron beam and the spacing between the twin-cathode ray beam.
Interior circular hole of diaphragm and diaphragm outer rim decentraction in said astigmatism and the coma offset lens, two center of circle spacings are d, the d value is to optimize to determine in the simulated experiment of electron gun.
In the said dynamic quadrupole field electrostatic lens, the rectangle endoporus of compensating diaphragm L1, L3 is vertically to be provided with, as the rectangle endoporus of the compensating diaphragm L2 of back pole piece G3-3 for being horizontally disposed with.
Said rail magnetic sheet constitutes in the compensation mechanism of magnetic lens, and diskette can use four pole piece structures or sextupole chip architecture separately, also can two kinds of structures mix use.
Beneficial effect of the present invention: be that electron trajectory in the double-beam electron gun is carried out astigmatism compensation, reduce the various aberrations that astigmatism causes, so that projection tube obtains high-resolution, high-definition image.
Further specify embodiment below in conjunction with accompanying drawing:
Description of drawings:
Fig. 1 is the electron-optical system schematic diagram that has in the double-beam electron gun of astigmatism compensation;
Fig. 2 is the double-beam electron gun structural representation that astigmatism compensation is arranged;
Fig. 3 a is the Wehnelt electrode shape; Fig. 3 b is the intensifying ring shape; Fig. 3 c is for proofreading and correct utmost point shape
Fig. 3 d and Fig. 3 e are two coma compensating plates; Fig. 3 f, Fig. 3 g are two dynamic quadrupole field electrostatic lens compensating plates.
Fig. 4 a is four dead-soft magnetic sheet structures; Fig. 4 b is a sextupole diskette structure;
In Fig. 1 electron-optical system, each symbol definition is: CL is a cathode lens, and SL is refracting prisms, and PL is preposition prefocus lens, and CML is that astigmatism and coma offset lens ML are dynamic quadrupole field electrostatic lens for main lens QL.
With reference to Fig. 2, Fig. 3, provide the double-beam electron gun structure chart, they are bases of projection electron gun.
The foundation of projection tube electron gun, cathode assembly label are 1, and along assembling G1 axisymmetrically, promptly Wehnelt electrode 2; G2, promptly intensifying ring 3; G2 ', promptly proofread and correct the utmost point 3 '; G3, i.e. the first anode, by the assembly that four electrod assemblies are formed, first pole piece is that G3-1, middle pole piece are that G3-2, back pole piece are that G3-3, tail pole piece are G3-4, promptly 4.1,4.2,4.3 and 4.4; Two off-centre operation diaphragms between G3-1 rear end and the G3-2 front end constitute astigmatism and coma offset lens, and G3-2 rear end and G3-4 front end are welded with in the rectangle fenestra compensating diaphragm L1, L3 they constitute dynamic quadrupole field electrostatic lens with the rectangle inner membrance pore membrane sheet L2 that has that is referred to as G3-3; The expansion bore part of G3-4 electrode rear end has been deep into label and is among 5 the anode tube G4.
Fig. 4 a and Fig. 4 b are respectively four, two kinds of diskette structures 6 of sextupole sheet and 6 ', be cyclic structure, in use, two kinds of structures can be used respectively, also can mix use.
In exemplary application of the present invention, confirmed that said mechanism has effective compensation and rectification to the electron beam aberration.
Claims (4)
1. a projection tube is with the double-beam electron gun that astigmatic compensation is arranged, on the double-beam electron gun basis, be provided with in order to reduce the electron optics compensating element, of optical aberration, it is characterized in that, set up the compensating diaphragm of two off-centre operation endoporus between first pole piece (G3-1) in the first anode in electron gun (G3) and the middle pole piece (G3-2), constitute astigmatism and coma offset lens, what increase in middle pole piece (G3-2) back that a slice is referred to as back pole piece (G3-3) has a rectangle endoporus compensating diaphragm (L2), it and both sides lay respectively at middle pole piece (G3-2) rear end, two of tail pole piece (G3-4) front end have rectangle endoporus compensating diaphragm (L1, L3) constitute dynamic quadrupole field electrostatic lens jointly, compensation is at screen edge and four jiaos of aberrations that the place causes, so that obtain minimum spot size, it is all visual clearly to reach whole image; In electron gun glass bulb neck outer rim, be with adjustable diskette, by the rotation of magnetic sheet position, constitute compensation mechanism, be used for regulating the centering of electron beam and the spacing between the twin-cathode ray beam.
2. double-beam electron gun according to claim 1 is characterized in that, in said astigmatism and the coma offset lens, and circular hole and diaphragm outer rim decentraction in the diaphragm, two center of circle spacings are d, the d value is to optimize to determine in the simulated experiment of electron gun.
3. double-beam electron gun according to claim 1, it is characterized in that, in the said dynamic quadrupole field electrostatic lens, the rectangle endoporus that is arranged in two compensating diaphragms (L1, L3) of pole piece (G3-2) rear end, tail pole piece (G3-4) front end is vertically setting, and the rectangle endoporus of the compensating diaphragm (L2) of pole piece (G3-3) is for being horizontally disposed with after being referred to as.
4. double-beam electron gun according to claim 1 is characterized in that, in the compensation mechanism that said diskette constitutes, diskette can use four pole piece structures or sextupole chip architecture separately, also can two kinds of structures mix use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99105543 CN1110061C (en) | 1999-04-14 | 1999-04-14 | Double-beam electron gun having astigmatism compensaton for projection tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99105543 CN1110061C (en) | 1999-04-14 | 1999-04-14 | Double-beam electron gun having astigmatism compensaton for projection tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1231495A CN1231495A (en) | 1999-10-13 |
| CN1110061C true CN1110061C (en) | 2003-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99105543 Expired - Fee Related CN1110061C (en) | 1999-04-14 | 1999-04-14 | Double-beam electron gun having astigmatism compensaton for projection tube |
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| Country | Link |
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| CN (1) | CN1110061C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110246403B (en) * | 2019-07-24 | 2021-06-18 | 哈尔滨工业大学（深圳） | Demonstration device and method for electromagnetism astigmatism and astigmatism |
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1999
- 1999-04-14 CN CN 99105543 patent/CN1110061C/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN1231495A (en) | 1999-10-13 |
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