CN1315149C - Indirect-heating electronic gun and its cathode-ray tube - Google Patents
Indirect-heating electronic gun and its cathode-ray tube Download PDFInfo
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- CN1315149C CN1315149C CNB200410077335XA CN200410077335A CN1315149C CN 1315149 C CN1315149 C CN 1315149C CN B200410077335X A CNB200410077335X A CN B200410077335XA CN 200410077335 A CN200410077335 A CN 200410077335A CN 1315149 C CN1315149 C CN 1315149C
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Abstract
The present invention discloses an indirect-heating electronic gun and a cathode-ray tube using the indirect-heating electronic gun. The technical problem to be solved is to reduce the size of a minimum cross point of the electronic gun, and thereby, the diameter of spots of an electronic beam is reduced, and the size of spots on a cathode-ray tube screen is reduced. The indirect-heating electronic gun is provided with a cathode, a prefocus lens and a main lens, wherein the prefocus lens comprises a first control grid pole and an acceleration control grid pole; the main lens comprises a focus control grid pole and an anode. The space between the acceleration control grid pole and the focus control grid pole is 1.5 times to 2.5 times as the hole diameter of the first control grid pole; the space between the focus control grid pole and the anode is 1.3 times to 1.5 times of the hole diameter of the first control grid pole. Compared with the prior art, the present invention has the advantages that the size of the minimum cross point of the electronic gun is decreased, diffuse angles of the electronic beam are favorably controlled, the distribution of electric fields of the main lens is ensured, the manufacturability of manufacturing the electronic gun is improved, and thereby, the performance of focusing and the qualified rate are enhanced; the present invention is suitable for industrial display and monitoring systems.
Description
Technical field
The cathode-ray tube structure that the present invention relates to a kind of indirect-heating electronic gun and use this electron gun.
Background technology
Unipotential gun is widely used in cathode ray tube, and particularly at little electric current application product, as industry demonstration and surveillance, unipotential gun has good resolution character and focus characteristics.In batch process, owing to the restriction of one (electron) gun structure, cause production, manufacturing process to be difficult to control, the main structure parameters of control electron gun performance is difficult to check, makes manufacturing rate of finished products low, and cost is higher, is difficult to adapt to the requirement of existing market.The unipotential gun structure of prior art as shown in Figure 1, is pressed the composition of electron gun, is made up of the focus control electrode 4 and the anode 7 of negative electrode 1, the first control grid 2, acceleration control grid 3, electron beam respectively.Its principal character is that the focus control electrode 4 of forming electron gun forms the unipotential electron lens with anode 7.Intersect from the electron beam and the electron gun axle of cathode emission, formed minimum crosspoint 5 at the first control grid 2 and 3 of grids of acceleration control, electron beam is quickened by focus control grid 4 subsequently, be subjected to the repulsive force effect between electron beam and disperse gradually, be subjected to the main lens effect of 7 on the focus control utmost point 4 and anode, formed focused beam hot spot 8, this is at the electron beam envelope at main lens place, be referred to as beam diameter, it is subjected to the difference of main lens Electric Field Distribution and difference, the difference of beam diameter directly influences the size of electron-baem spot to the screen.Therefore, show purpose in order to reach high-resolution, the size of controlling electron beam luminous point, controlling electron beam diameter just, the size of control prefocus field, controlling electron beam is vital in the angle of divergence of main lens.
In order to obtain little electron-baem spot diameter, the diameter in minimum crosspoint must be controlled very little, but when electron beam current increased, it is difficult that its control just becomes.In the unipotential gun structure, focus control grid 4 voltages close with quickening control grid 3 have about 6000V, this makes penetration of electric field bigger, because focus control grid 4 limited aperture, make most of electron beam be blocked, repulsive force between the electron beam makes the aberration of electron-optical system increase, thereby beam divergence angle is increased, and it is bigger that electron-baem spot also becomes.
On the other hand, limited by electron gun structure, when the electron gun welding, quicken control grid 3 and can only back cushion sheet guarantee at interval with anode 7 that with focus control grid 4, focus control grid 4 this is difficult to control and check in follow-up production technology; And in the electron gun manufacture process, the unloading pad very easily causes inclination at interval, this makes the Electric Field Distribution of quickening control grid 3 and focus control grid 4 change, be difficult to guarantee that the prefocus field satisfies the requirement of beam divergence angle, thereby make electron beam spot distrotion on the screen and fuzzy phenomenon occurs showing.
Summary of the invention
The purpose of this invention is to provide a kind of indirect-heating electronic gun and cathode ray tube thereof, the technical problem that solve is to make the minimum crosspoint size of electron gun reduce, thereby reduces the electron-baem spot diameter, and the spot definition on the cathode ray tube screen is reduced.
A kind of heating electronic gun of asking, have negative electrode, prefocus lens and main lens, prefocus lens comprises the first control grid, quickens the control grid, main lens comprises focus control grid and anode, described acceleration control grid and focus control gate pitch are 1.5 to 2.5 times of the first control grid aperture, focus control grid and anode spacing are 1.3 to 1.5 times of the first control grid aperture, and the first control grid aperture is 0.20 to 0.35 millimeter.
The first control grid aperture of the present invention is 0.20,0.25 or 0.35 millimeter.
The negative electrode of the present invention and the first control grid be spaced apart 0.1 to 0.3 times of the first control grid aperture, the first control grid is 0.3 to 0.5 times of the first control grid aperture with quickening the control gate die opening.
The first control grid hole Zhou Houdu of the present invention is 0.2 to 0.3 times of the first control grid aperture.
Focus control grid of the present invention has by two bottoms that the hole is cup-shaped, rim of a cup has flange and the combination of electrodes of two flanges butt joint forms, anode be shaped as that cup-shaped, bottom have the hole, rim of a cup has flange.
The first control grid of the present invention is shaped as cup-shaped, and the cup end has the hole, quickens the control grid and is shaped as tabular, the centre is arranged with three holes along minor axis, the hole on both sides is a location hole, and its adjacent both sides have outstanding spill respectively, and wherein Yi Bian spill one side has a protrusion.
The aperture of anode of the present invention is 4.0mm.
Electron gun external diameter of the present invention is φ 10.2 to φ 11.0mm.
A kind of cathode ray tube comprises electron gun: the prefocus lens of described electron gun comprises the first control grid, quickens the control grid; Main lens system comprises focus control grid and anode, acceleration control grid and focus control gate pitch are 1.5 to 2.5 times of the first control grid aperture, focus control grid and anode spacing are 1.3 to 1.5 times of the first control grid aperture, and the first control grid aperture is 0.20 to 0.35 millimeter.
Cathode ray tube of the present invention is flat CRT or small-sized direct viewing kinescope.
Patent of the present invention compared with prior art, acceleration control grid and focus control gate pitch are 1.5 to 2.5 times of the first control grid aperture, focus control grid and anode spacing are 1.3 to 1.5 times of the first control grid aperture, the focus control grid is that the combination of electrodes by two butt joints forms, accelerating electrode be shaped as cup-shaped, rim of a cup has flange, reduced the crosspoint size of electron gun, controlled beam divergence angle preferably, adjust the interval between focus control grid and the anode, guarantee the Electric Field Distribution of main lens, improve the manufacturability that electron gun is made, thereby improved focusing performance and yields.
Description of drawings
Fig. 1 is the unipotential gun structural representation of prior art.
Fig. 2 is a prior art unipotential gun surface structure schematic diagram.
Fig. 3 is the structural representation of indirect-heating electronic gun embodiment of the present invention.
Fig. 4 is indirect-heating electronic gun of the present invention prefocus system electronic beam trajectory schematic diagram when condition 1.
Fig. 5 is indirect-heating electronic gun of the present invention main lens system electron beam trace schematic diagram when condition 1
Fig. 6 is indirect-heating electronic gun of the present invention prefocus system electronic beam trajectory schematic diagram when condition 2.
Fig. 7 is indirect-heating electronic gun of the present invention main lens system electron beam trace schematic diagram when condition 2.
Fig. 8 is the acceleration control gate electrode structure schematic diagram of indirect-heating electronic gun embodiment of the present invention.
Fig. 9 is the focus electrode structure schematic diagram of indirect-heating electronic gun embodiment of the present invention.
Figure 10 is indirect-heating electronic gun anode of the present invention and convergence cap schematic diagram.
Figure 11 is the schematic diagram that adopts the cathode ray tube embodiment () of indirect-heating electronic gun of the present invention.
Figure 12 is the schematic diagram that adopts the cathode ray tube embodiment (two) of indirect-heating electronic gun of the present invention.
Embodiment
Below in conjunction with drawings and Examples the present invention is described in further detail.As shown in Figure 1, the indirect-heating electronic gun of prior art, it comprises negative electrode 1, the first control grid 2, quickens control grid 3, focus control electrode 4,6, anode 7, wherein focus control electrode 4 and anode 7 are applied with a lower voltage for threshold voltage, electrodes 6 such as high potentials, therefore electrode 4,6,7 has formed the unipotential electron lens, and its application example as shown in Figure 2.
As shown in Figure 3, indirect-heating electronic gun of the present invention comprises negative electrode, prefocus lens and main lens, and prefocus lens comprises the first control grid 32, quickens control grid 33, focus control electrode 34, before negative electrode 31 is arranged on the first control grid 31; The first control grid 32 is shaped as cup-shaped, and cup has the hole in an end, and applies certain voltage towards quickening control grid 33, the first control grids 32 respectively with quickening control grid 33, and it is adjacent and keep a determining deviation to quicken control grid 33 and focus control grid 34; Main lens comprises focus control grid 34 and anode 35.Apply 300 volts and 6000 volts of voltages on focus control grid 34 and the anode 35 respectively, therefore forming a bipotential electric field structure at a distance of between two current potentials of certain distance.Quicken control grid 32 and be applied with accelerating voltage, between the first control grid 32 and acceleration control grid 33, form prefocus lens; Be main lens field between focus control grid 34 and the anode 35, its light-emitting phosphor that electron beam is further assembled and the accelerated electron beam impact fluorescence shields to tentatively focusing on.
As shown in Figure 8, quickening control grid 33 is slab construction, and the centre is arranged with three holes along minor axis, and the hole on both sides is the assembling and positioning hole, and the both sides of both sides, hole have outstanding spill respectively, and wherein Yi Bian spill one side has a protrusion.Quicken 33 pairs of control grids and the acceleration control action is arranged from negative electrode 31 electrons emitted, adjust and quicken the spacing distance that the control utmost point 33 and first is controlled 32 of grids, make that the size and the position in minimum crosspoint are controlled, thereby the beam divergence angle that enters main lens is controlled.
As shown in Figure 9, focus control electrode 34 by two be shaped as cup-shaped, cup has the hole in an end, rim of a cup has flange, the first focus control grid 341 and the second focus control grid 342 of the butt joint of two flanges combine.
As shown in figure 10, anode 35 be shaped as cup-shaped, the bottom has the hole that the aperture is 4.0mm, rim of a cup has flange.Convergence cap 36 docks assembly welding with anode 35 and forms.
When first center bore of controlling grid 32 is D1, D1 is 0.20 millimeter, when the negative electrode 31 and the first control grid 32 to be spaced apart 0.1 times of D1, the first control grid 32 and to quicken control grid 33 spacings be 0.3 times of D1, quicken control grid 33 and focus control grid 34 spacings is 1.5 times of D1, focus control grid 34 and accelerating anode 35 spacings are that 1.3 times of D1, the first control grid, 31 hole Zhou Houdu are 0.2 times of D1, when the electron gun external diameter is φ 10.2mm, divergent bundle is focused on well and satisfies the homogeneous tube display requirement.Table 1 is existing electron gun and electron gun characteristic test result of the present invention comparison, as shown in Figure 4, is prefocus lens structure and electron beam trace situation during condition 1 in the table 1, as shown in Figure 5, is main lens structure and electron beam trace situation during condition 1 in the table 1; When the cathode emission electric current was 100 microamperes, the electron-baem spot diameter at screen center 5% place was 0.74 millimeter
When the center bore of the first control grid 32 is 0.35 millimeter, being spaced apart 0.3 times of D1, the first control grid 32 and quickening control grid 33 spacings of the negative electrode 31 and the first control grid 32 be 0.5 times of D1, quicken control grid 33 and focus control grid 34 spacings be 2.5D1, focus control grid 34 with anode 35 spacings be 1.5D1, the first control grid, 31 hole Zhou Houdu be 0.3D1, when the electron gun external diameter is φ 11.0mm, position, minimum crosspoint anode direction moves, and its size has increase slightly.Table 1 is existing electron gun and electron gun characteristic test result of the present invention comparison, as shown in Figure 6, is prefocus lens structure and electron beam trace situation during condition 2 in the table 1, as shown in Figure 7, is main lens structure and electron beam trace situation during condition 2 in the table 1; Can find out that from table 1 this moment, the electron-baem spot diameter at screen center 5% place was 1.10 millimeters when the cathode emission electric current is 100 microamperes.
When the center bore of the first control grid 32 is 0.25 millimeter, be spaced apart 0.15D1, the first control grid 32 and acceleration control grid 33 spacings that negative electrode 31 and first is controlled grid 32 are that 0.45D1, acceleration control grid 33 and focus control grid 34 spacings are that 1.8D1, focus control grid 34 and anode 35 spacings are that 1.35D1, the first control grid, 32 hole Zhou Houdu are that 0.25D1, electron gun external diameter are φ 10.5, its minimum crosspoint diameter is 0.013, move to the first control gate extreme direction its position, and its detailed data sees Table 1 condition, 3 results.
From the electron optics analog computation of theory and actual measurement as can be known, when the negative electrode 31 and the first control grid 32 to be spaced apart 0.1 to 0.3 times of D1, the first control grid 32 and to quicken control grid 33 spacings be 0.3 to 0.5 times of D1, quicken control grid 33 and focus control grid 34 spacings is 1.5 to 2.5 times of D1, focus control grid 34 and accelerating anode 35 spacings are that 1.3 to 1.5 times of D1, the first control grid, 31 hole Zhou Houdu are 0.2 to 0.3 times of D1, when the electron gun emission current is 100 microamperes, can make electron-baem spot on the phosphor screen satisfy the display requirement of homogeneous tube.
As Fig. 4, Fig. 5, Fig. 6 and shown in Figure 7, the operation principle of indirect-heating electronic gun of the present invention: hot electron is launched respectively from the center and the edge of negative electrode 31, form electron beam path 40,40 ', thereby form minimum crosspoints 45 at the first control grid 32 and 33 of acceleration control grids, under the acceleration of quickening control grid 33 electric fields, the electron beam at place, minimum crosspoint begins to disperse, but be subjected to quicken control grid 33, focus control grid 34 and focus control grid 34, under the effect of the convergent lens of 35 formation of anode, electron-beam convergence becomes the hot spot of certain size size, light-emitting phosphor on the fluorescence excitation screen, thus a certain size electron-baem spot 59 formed.
As Figure 11 and shown in Figure 12, be to use the flat cathode-ray tube and the miniature picture tube of indirect-heating electronic gun of the present invention, insert in the cathode ray tube neck after indirect-heating electronic gun location, the centering, and by the neck pipe place that length is enclosed shell of sealing of homogeneous tube performance requirement.
From Fig. 4, Fig. 5, Fig. 6 and electron beam trace shown in Figure 7 are as can be seen, acceleration control grid 33 and focus control grid 34 that indirect-heating electronic gun shown in Figure 3 forms, the Electric Field Distribution that focus control grid 34 and anode are 35, the formed electron lens of its electric field has converging action to the effect of electron beam, that is to say and quickening control grid 33 and focus control grid 34, the effect of the convex lens of focus control grid 34 and 35 formation of anode is stronger, so just the drawn up angle of divergence of electron beam, the electron beam spot definition reduces on the screen thereby make, and has improved display resolution.
Reasonably be provided with the hole Zhou Houdu that quickens control grid 33, the interval of quickening control grid 33 and focus control grid 34 in the indirect-heating electronic gun of the present invention, make the electron beam of prefocus field when quickening, can not disperse fast by axial convergent force effect; When passing focus control grid 34 electrodes, enter focus control grid 34 and the main lens zone of convergence that anode 35 forms rapidly simultaneously, make electron beam when entering main lens, have the relatively little angle of divergence.
Effectively the drawn up size in minimum crosspoint of said structure, but be subjected to the influence of display frame GTG, and electron beam current has and varies in size.The size in minimum crosspoint under the big current conditions of drawing up also will make it keep the minimum crosspoint diameter of basically identical under little current conditions simultaneously.When little current emission, because the electron beam of cathode emission is few, minimum crosspoint makes the multiplication factor of prefocus field and main lens increase near negative electrode; Move to cathode direction owing to minimum crosspoint simultaneously, make electron-baem spot reduced by the convergent force of electric field in prefocus field and main lens position, beam divergence angle will be big slightly, and make the electron-baem spot on the screen increase to some extent, and the resolution of picture demonstration will reduce like this.In the present invention, by considering, drawn the condition of electron-baem spot characteristic with optimum performance to above-mentioned situation is compatible:
Wherein D1 is the bore dia of the first control grid 32, and when being 0.25 millimeter, the size of each electrode is provided with as follows:
The first control grid 32 hole Zhou Houdu are 0.2 to 0.3D1;
The first control grid 32 is spaced apart 0.3 to 0.5D1 with acceleration control grid 33;
Quickening control grid 33 is 1.5D1 to 2.5D1 with focus control grid 34 spacings;
The reason of above-mentioned setting is: when the interval of the negative electrode 31 and the first control grid 32 during greater than give maximum, electric field therebetween dies down, and the lensing region growing makes the electron-baem spot change greatly and influence focusing performance; When its during at interval less than giving minimum value, on the one hand, very easily cause the phenomenons such as short circuit of heat emission process, on the other hand, because electric field strengthens near the negative electrode, make the unit interval electron emission amount increase, the thermal expansion effects of the control gate utmost point 32 of winning, acceleration control grid 33 hole circumferential portion is strengthened, cause the first control grid 32 and quicken control grid 33 interval variation, thereby some electrical characteristics that cause electron gun change the fluctuation that causes the complete machine performance.
Can illustrate that equally other interval variation causes the indirect-heating electronic gun changes of properties.
Bipotential electron gun of the present invention is the narrow neck product, and it can be the demonstration field that one (electron) gun is used for some monochromatic tube, and the also yi word pattern three-gun structure of arranging is used for the color picture tube of little cast.Service condition for monochromatic tube is:
The first control grid, 32 voltages: 0V
Adopt the indirect-heating electronic gun and the above-mentioned condition of work of structure of the present invention, can make that the electron-baem spot diameter reduces 2% to 30% under the little current work condition, and make the indirect-heating electronic gun manufacturing process simple and reliable, the electron gun cost reduces about more than 10%.
Table 1 is for having electron gun and electron gun characteristic test result of the present invention now relatively
| Distinguish | Minimum crosspoint diameter | Position, minimum crosspoint | Main lens diameter | The screen electron-baem spot |
| Condition 1 | 0.0152 | 0.2294 | 0.7518 | 1.10 |
| | 0.0124 | 0.1857 | 0.6766 | 0.743 |
| | 0.0132 | 0.2022 | 0.7134 | 0.9221 |
| Existing single electron position electron gun | 0.0275 | 0.214 | 0.6189 | 1.1241 |
Claims (10)
1. indirect-heating electronic gun, have negative electrode, prefocus lens and main lens, prefocus lens comprises the first control grid, quickens the control grid, main lens comprises focus control grid and anode, it is characterized in that: described acceleration control grid and focus control gate pitch are 1.5 to 2.5 times of the first control grid aperture, focus control grid and anode spacing are 1.3 to 1.5 times of the first control grid aperture, and the first control grid aperture is 0.20 to 0.35 millimeter.
2. indirect-heating electronic gun according to claim 1 is characterized in that: the described first control grid aperture is 0.20,0.25 or 0.35 millimeter.
3. indirect-heating electronic gun according to claim 1 and 2, it is characterized in that: the described negative electrode and the first control grid be spaced apart 0.1 to 0.3 times of the first control grid aperture, the first control grid is 0.3 to 0.5 times of the first control grid aperture with quickening the control gate die opening.
4. indirect-heating electronic gun according to claim 3 is characterized in that: the described first control grid hole Zhou Houdu is 0.2 to 0.3 times of the first control grid aperture.
5. indirect-heating electronic gun according to claim 4, it is characterized in that: described focus control grid has by two bottoms that the hole is cup-shaped, rim of a cup has flange and the combination of electrodes of two flanges butt joint forms, anode be shaped as that cup-shaped, bottom have the hole, rim of a cup has flange.
6. indirect-heating electronic gun according to claim 5, it is characterized in that: the described first control grid is shaped as cup-shaped, the cup end, have the hole, quicken the control grid and be shaped as tabular, the centre is arranged with three holes along minor axis, the hole on both sides is a location hole, and its adjacent both sides have outstanding spill respectively, and wherein Yi Bian spill one side has a protrusion.
7. indirect-heating electronic gun according to claim 6 is characterized in that: the aperture of described anode is 4.0mm.
8. indirect-heating electronic gun according to claim 7 is characterized in that: described electron gun external diameter is φ 10.2 to φ 11.0mm.
9. a cathode ray tube comprises electron gun, it is characterized in that: the prefocus lens of described electron gun comprises the first control grid, quickens the control grid; Main lens system comprises focus control grid and anode, acceleration control grid and focus control gate pitch are 1.5 to 2.5 times of the first control grid aperture, focus control grid and anode spacing are 1.3 to 1.5 times of the first control grid aperture, and the first control grid aperture is 0.20 to 0.35 millimeter.
10. cathode ray tube according to claim 9 is characterized in that: described cathode ray tube is flat CRT or small-sized direct viewing kinescope.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410077335XA CN1315149C (en) | 2004-12-09 | 2004-12-09 | Indirect-heating electronic gun and its cathode-ray tube |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410077335XA CN1315149C (en) | 2004-12-09 | 2004-12-09 | Indirect-heating electronic gun and its cathode-ray tube |
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| CN1624858A CN1624858A (en) | 2005-06-08 |
| CN1315149C true CN1315149C (en) | 2007-05-09 |
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|---|---|---|---|---|
| US4318027A (en) * | 1978-04-12 | 1982-03-02 | Rca Corporation | High potential, low magnification electron gun |
| US4337409A (en) * | 1979-05-25 | 1982-06-29 | U.S. Philips Corporation | Color display tube with control grid positioning feature |
| US4724359A (en) * | 1986-10-17 | 1988-02-09 | General Electric Company | Laminar flow guns for light valves |
| CN1051821A (en) * | 1989-10-30 | 1991-05-29 | 松下电子工业株式会社 | Color cathode ray tube of shadow mask type |
| CN1300443A (en) * | 1999-04-15 | 2001-06-20 | 三菱电机株式会社 | Crt electron gun |
| CN1314698A (en) * | 2000-03-20 | 2001-09-26 | 株式会社日立制作所 | Cathode ray tube with unipotential focus electronic gun |
| US20030151347A1 (en) * | 2002-01-10 | 2003-08-14 | Samsung Sdi Co., Ltd. | Electron gun with a multi-media monitor |
-
2004
- 2004-12-09 CN CNB200410077335XA patent/CN1315149C/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4318027A (en) * | 1978-04-12 | 1982-03-02 | Rca Corporation | High potential, low magnification electron gun |
| US4337409A (en) * | 1979-05-25 | 1982-06-29 | U.S. Philips Corporation | Color display tube with control grid positioning feature |
| US4724359A (en) * | 1986-10-17 | 1988-02-09 | General Electric Company | Laminar flow guns for light valves |
| CN1051821A (en) * | 1989-10-30 | 1991-05-29 | 松下电子工业株式会社 | Color cathode ray tube of shadow mask type |
| CN1300443A (en) * | 1999-04-15 | 2001-06-20 | 三菱电机株式会社 | Crt electron gun |
| CN1314698A (en) * | 2000-03-20 | 2001-09-26 | 株式会社日立制作所 | Cathode ray tube with unipotential focus electronic gun |
| US20030151347A1 (en) * | 2002-01-10 | 2003-08-14 | Samsung Sdi Co., Ltd. | Electron gun with a multi-media monitor |
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| CN1624858A (en) | 2005-06-08 |
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