CN1243331A - Colour cathode-ray tube - Google Patents
Colour cathode-ray tube Download PDFInfo
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- CN1243331A CN1243331A CN 99111919 CN99111919A CN1243331A CN 1243331 A CN1243331 A CN 1243331A CN 99111919 CN99111919 CN 99111919 CN 99111919 A CN99111919 A CN 99111919A CN 1243331 A CN1243331 A CN 1243331A
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Abstract
An inline type electron gun assembly has a main lens for focusing three electron beams on a phosphor screen. A resistor is arranged in a cathode ray tube. A voltage obtained by dividing a high voltage with the resistor is applied to an intermediate electrode. Voltages of a focusing electrode, the intermediate electrode, and a final accelerating electrode that constitute the main lens are determined to increase sequentially. Electron beam holes in the intermediate electrode on the focusing electrode side, and electron beam holes in the intermediate electrode on the final focusing electrode side form vertically elongated holes longer in the vertical direction than in the horizontal direction. Electron beam holes in the focusing electrode on the intermediate electrode side and electron beam holes in the final accelerating electrode on the intermediate electrode side form open holes having no side wall portions. A color cathode ray tube having an electron gun assembly capable of improving resolving power can be provided.
Description
The present invention relates to color cathode ray tube, improve its electron gun structure can obtain high-resolution on whole phosphor screen color cathode ray tube thereby relate in particular to.
In color cathode ray tube, by 3 beam electrons bundles of electron gun structure emission in level, vertical direction deflection, thus, electron beam scanning phosphor screen, display image on this phosphor screen.Especially, in self-convergent system in-line arrangement color cathode ray tube, three electron guns are configured to an array type electron gun component groups that is listed as and are contained in the neck part on same horizontal plane, shown in Figure 1A, horizontal deflection magnetic field forms pincushion 1H, and shown in Figure 1B, vertical deflection magnetic field forms barrel-shaped 1V.Like this, magnetic deflection field becomes non-uniform magnetic-field, thus, special device needn't be set, and 3 beam electrons bundles are easy to own to the screen convergence.At present, the color cathode ray tube of this sample loading mode has become main flow.
In this cathode ray tube, because above-mentioned magnetic deflection field is uneven, even the bundle spot of phosphor screen middle body is circular, the beam spot of phosphor screen periphery also is subjected to disperse function in the horizontal direction, becomes and owes focus state; Be subjected to focussing force in vertical direction, became focus state.
Moreover, to fluoroscopic distance, become big from electron gun structure with the electron-beam deflection amount increase, even therefore form the little circle of diameter at phosphor screen central portion beam splitting spot, at the phosphor screen periphery, the bundle spot also became focus state.
As a result, the bundle spot of phosphor screen periphery, in vertical direction, owing to the effect of above-mentioned 2 aspects becomes the more significant focus state of crossing, horizontal direction, above-mentioned 2 aspect effects compensate mutually and become the approximate focus state.That is, at fluoroscopic periphery, because of horizontal direction and this reason of vertical direction focus state difference, produce astigmatism, as shown in Figure 2, bundle spot 2 distort by the dizzy portion 4 of high briliancy core 3 and low briliancy form non-circular, the exploring degree of phosphor screen periphery significantly worsens.
On the other hand, in order to improve the electron beam bore, importantly make the electrode aperture that forms the electron gun structure main lens big, to reduce spherical aberration.For this reason, must make the space of 3 beam electrons bundles become big.But, big if 3 beam electrons bundle spaces become, then there are 3 beam electrons beam convergence deterioration in characteristics problems.Again, the neck of configuration electron gun structure, its internal diameter are restricted the electrode aperture that forms main lens portion.
As mentioned above, in order to make color cathode ray tube exploring degree good, must make the constant main lens that makes greatly in 3 beam electrons bundle spaces is heavy caliber and the focusing of crossing that improves image periphery vertical direction.
As the method that reaches this main lens heavy caliberization and improvement deflection distortion, open the structure that has proposed following electron gun structure in the clear 64-38947 communique (USP 4897575) the spy.This electron gun structure, shown in Fig. 3 A and 3B, main lens is by focusing electrode G5, and 2 target Gm1, Gm2 and final accelerating electrode G6 constitute.In being shown in the electron gun structure of Fig. 3, by resistance T along the configuration of the electrode of this electron gun structure, the high pressure that adds to final accelerating electrode G6 is generated the 1st and the 2nd predetermined voltage by electric resistance partial pressure, and this predetermined the 1st and the 2nd voltage is applied to target Gm1, Gm2.Again, the voltage behind the fixing direct voltage of the dynamic electric voltage stack of the parabolic shape that changes synchronously with the electron beam deflecting adds to focusing electrode G5.All electron beam through-holes that form focusing electrode G5, target Gm1, Gm2 and the final accelerating electrode G6 of this electron gun structure main lens all form circular port.Again, in focusing electrode G5 and final accelerating electrode G6, do not form side wall portion at electron beam through-hole along face, promptly do not form plunging (burring) (or circumferential flange), for this reason, in focusing electrode G5 and final accelerating electrode G6 inside, form the public electric field of 3 beam electrons bundles in the horizontal direction.Thus, near focusing electrode G5, form the 1st quadrapole lens that vertical direction has relative strong-focusing effect, near final accelerating electrode G6, form the 2nd quadrapole lens that vertical direction has strong relatively disperse function.
In the electron gun structure that constitutes like this, can form the expansion electric field lens of expansion main lens by target Gm1, Gm2.And then, when picture periphery deflection beam, provide high voltage (dynamic electric voltage) to focusing electrode G5, focusing electrode G5 diminishes with voltage difference in abutting connection with the target Gm1 of this focusing electrode G5, so the 1st quadrapole lensing weakens, electron beam is dispersed in vertical direction, can compensate the focus state of crossing of vertical direction that the non-uniform magnetic-field that is subjected to deflecting coil influences.
Therefore, according to the electron gun structure of this structure, these two problems of degree of separating deterioration of analysing that above-mentioned heavy caliberization and deflection distortion cause of improving have been solved.
But, electron gun structure according to above-mentioned structure, because in the focusing electrode G5 and final accelerating electrode G6 of main lens part, do not form side wall portion (plunging) at electron beam through-hole along face, vertical direction relative aperture horizontal direction is little, thereby, compare with horizontal direction, it is very big that the spherical aberration of vertical direction becomes, vertical direction beam spot bore is also big than horizontal direction beam spot bore, at the picture middle body, beam spot becomes lengthwise, and the exploring degree of picture middle body worsens.
Especially, when cathode ray tube size and deflection angle are big, need to strengthen above-mentioned the 1st quadrapole lensing, at this moment, take that focusing electrode G5 is gone up the circular hole that forms with final accelerating electrode G6 and make measures such as the hole of growing crosswise, the vertical direction bore is further diminished.Thus, the vertical direction spherical aberration increases more, and picture middle body beam spot becomes elongate shape more, the remarkable deterioration of exploring degree of picture central portion.
As mentioned above, in order to make cathode ray tube exploring degree good, the space of 3 beam electrons bundles need do not increased and the vertical direction that increases the main lens bore and improve the picture periphery is crossed focusing.
As the electron gun structure that reaches this main lens heavy caliberization and improvement deflection distortion, by focusing electrode, constitute main lens by the target that places the interior resistance of pipe to apply expectation voltage with final accelerating electrode, near focusing electrode, be formed on the asymmetric focusing electric field that vertical direction has relative strong-focusing effect, near final accelerating electrode, form the asymmetric divergencing field that vertical direction has strong relatively emission effect, substantially separate this asymmetric focusing electric field and asymmetric divergencing field by target, the dynamic electric voltage that changes synchronously with the electron beam deflecting is provided to focusing electrode.
But, only use this structure, compare with horizontal aspect, it is very big that the vertical direction spherical aberration becomes, and vertical direction beam spot bore is also big than horizontal direction beam spot bore, at the picture middle body, beam spot becomes lengthwise, and this part picture exploring degree worsens, especially when cathode ray tube size and deflection angle are big, the vertical direction spherical aberration increases all the more, and the exploring degree significantly worsens.
The object of the present invention is to provide a kind of color cathode ray tube, restraint the little and even electron gun structure that can improve cathode ray tube exploring degree of spot on the whole phosphor screen thereby it has to make.
According to the present invention, a kind of color cathode ray tube is provided, it comprises: electron gun structure and be configured near the resistance the described electron gun structure in the pipe, described electron gun structure contains the electron beam generating unit of generation by central electron beam that is in same horizontal plane and the 3 beam electrons bundles that a pair of side electron beam is formed, form a line, and the described electron beam that described electron beam generating unit is launched is finally focused on main lens on the phosphor screen;
Described main lens is by constituting from focusing electrode, at least 1 target and the final accelerating electrode that forms 3 electron beam through-holes of the row configuration gradate of the described phosphor screen direction of described electron beam generating unit side direction, corresponding with described 3 beam electrons bundles;
Its structure is taken as the high pressure that is offered described final accelerating electrode by described electric resistance partial pressure, provide predetermined voltage to described target, make the voltage of the described focusing electrode, described target and the described final accelerating electrode that constitute described main lens, increase in turn from the described phosphor screen direction of described electron beam generating unit side direction, and will be taken as the vertical direction vertical slot hole longer in abutting connection with the focusing electrode side of the described target of described focusing electrode and in abutting connection with the described electron beam through-hole of the final accelerating electrode side of the described target of described final accelerating electrode than horizontal direction.
Again, in above-mentioned cathode ray tube, the electron beam through-hole of the target side of described focusing electrode and the target side of final accelerating electrode forms the perforate that does not have side wall portion; The electron beam through-hole of the final accelerating electrode side of the target of the focusing electrode side of the target of the described focusing electrode of adjacency and the described final accelerating electrode of adjacency is formed into the vertical direction vertical slot hole longer than horizontal direction.
In having the electron gun structure of above-mentioned structure, same with electron gun structure in the past, by target expansion main lens, thereby form heavy caliber expansion electric field.Between the target of the 5th grid and adjacency, form the vertical direction focussing force focusing electric field stronger than horizontal direction.Between the target of the 6th grid and adjacency, form the vertical direction disperse function divergencing field stronger than horizontal direction.In both balances of picture middle body, at the picture peripheral part, the electron lens between the target of the 5th grid and adjacency weakens, and the vertical direction focussing force weakens, and can compensate the vertical direction that influenced by the deflecting coil non-uniform magnetic field and cross focus state.And then, compare with electron gun structure in the past, can not make horizontal direction spherical aberration deterioration and make the vertical direction spherical aberration good, thereby can make the spherical aberration of horizontal direction and vertical direction roughly the same and all good.
As a result, the beam spot mouth of horizontal direction and vertical direction is through roughly the same, can obtain evenly in whole image, circular and very little beam spot, and the exploring degree can be provided significantly.And then, even when cathode ray tube size and deflection angle become big, but also spherical aberration deterioration and strengthen 4 extremely son effects not, thus the distortion of the beam spot that prior art produces can be eliminated, obtain the beam spot of circular in whole image.
The horizontal deflection magnetic field and the vertical deflection magnetic field of the self-convergent system cathode ray tube of dress array type electron gun assembly in Figure 1A and 1B represent respectively.
Fig. 2 is the beam spot plan view that is used to illustrate in-line arrangement color cathode ray tube deflection aberration in the past.
Fig. 3 A and 3B are that the in-line arrangement color cathode was penetrated the summary section of adorning the structure of electron gun structure horizontal direction and vertical direction in the pipe in the past.
Fig. 4 is the summary section of the in-line arrangement color cathode ray tube structure of the embodiment of the invention.
Fig. 5 A and 5B are the in-line arrangement color cathode ray tube interior dress electron gun structure horizontal direction of one embodiment of the invention and the summary section of vertical direction structure.
Fig. 6 is the front view that is shown in the grid of Fig. 5.
Fig. 7 is the neck of the summary in-line arrangement color cathode ray tube of representing one embodiment of the invention and the profile of electron gun structure position relation.
Hereinafter, with reference to accompanying drawing, the electron gun structure of one embodiment of the invention is described.
The in-line arrangement color cathode ray tube of one embodiment of the invention shown in Fig. 4.This color cathode ray tube has by panel 10 and the funnel type pipe that is connected with these panel 10 one bores 11 shells that constitute.At these panel 10 inner surfaces, promptly on panel, form by sending the phosphor screen 12 that indigo plant, strip 3 look luminescent coatings green, ruddiness constitute.Relative with this phosphor screen 12, side configuration within it forms a plurality of shadow masks 13 that pass through the electron beam through-hole of electron beam.Again, in the neck 14 of pipe awl 11, electron gun structure 16 is set, 3 beam electrons bundle 15B, 15G, 15R that the row that emission is made up of the central electron beam 15G that is in same horizontal plane and a pair of side electron beam 15B, 15R dispose.By 3 beam electrons bundle 15B of these electron gun structure 16 emissions, the magnetic core logical circuit deflection that 15G, 15R are produced by the deflecting coil 17 that is installed in pipe awl 11 outsides, by the above-mentioned phosphor screen 12 of this 3 beam electrons bundle 15B, 15G, 15R (H direction) and vertical direction (V direction) scanning in the horizontal direction, thus on phosphor screen 12 color display.
This electron gun structure 16, shown in Fig. 5 A and 5B, its structure is to dispose following parts in order: one be listed as 3 negative electrode KB, KG, the KR that disposes in the horizontal direction, heat 3 heaters (not shown) of these negative electrodes KB, KG, KR, the 1st grid G 1 of arranged in order between above-mentioned negative electrode KB, KG, KR and phosphor screen, the 2nd grid G 2, the 3rd grid G 3, the 4 grid G 4, the 5 grid G 5, the the 1st and the 2nd target Gm1, Gm2, the 6th grid G 6 and assembly cup C.Again, the 1st grid G 1 to the 6th grid G 6 is supported, is fixed by insulation supporting rod (not shown), and assembly cup C is installed on the 6th grid G 6.
Resistance T shown in Fig. 5 B is arranged near electron gun structure 16, and one end 110 connects the 6th grid G 6, the other end 120 ground connection.Its intermediate point 130,140 connects predetermined the 1st, the 2nd target Gm1, Gm2 respectively.
On each grid in the horizontal direction (H direction) form the electron beam through-hole of 3 pre-sizings arranged side by side, the 1st grid G 1 and the 2nd grid G 2 are made of lamellar electrode, form 3 little circular electron beams of diameter and pass through the hole on this plate electrode.The 3rd grid G the 3, the 4th grid G the 4, the 5th grid G 5 and the 6th grid G 6 have the structure of a plurality of cup-shape electrode open ends of butt joint, the 2nd grid G 2 sides in the 3rd grid G 3, form than 3 the big slightly circular electron beams of electron beam through-hole diameter that form on the 2nd grid G 2 and pass through the hole, in the 4th grid G 4 sides, the 4th grid G 4 both sides, the 5th grid G 5 both sides, the 6th grid G 6 both sides of the 3rd grid G 3, form 3 big circular electron beams of diameter and pass through the hole.Especially, in the 1st target Gm1 of the 5th grid G 5 and the 2nd target Gm2 side of the 6th grid G 6, regulation makes to have and does not form electron beam through-hole along the face sidewall, does not promptly form the perforate of plunging.The the 1st and the 2nd target Gm1, Gm2 form 3 electron beam through-holes on the slab electrode.With the 5th grid G 5 sides of the 1st target Gm1 of the 5th grid G 5 adjacency and with the electron beam through-hole of the 6th grid G 6 sides of the 2nd target Gm2 of the 6th grid G 6 adjacency, as shown in Figure 6, form the big elongate shape of vertical direction relative aperture horizontal direction bore.Again, be close to the 5th grid G 5 the 1st target Gm1 the 2nd target Gm2 side and form circle in abutting connection with the electron beam through-hole of the 1st target Gm1 side of the 2nd target Gm2 of the 6th grid G 6.
Now narrate the electron beam through-hole of horizontal direction (H direction) and vertical direction (V direction).
As previously mentioned, though in order to improve the beam spot bore, the method that the electron beam through-hole bore of the electrode that forms the electron gun structure main lens is become greatly, spherical aberration is diminished is effective, but since the internal diameter of the neck 14 of configuration electron gun structure, the aperture of having limited the electron beam through-hole of the electrode that forms the main lens part.Thereby the maximum electron beam of electrode is determined by the neck bore by the aperture in hole.In Fig. 7, the position relation of neck 14 and electron gun structure 16 is shown.Wherein, if being 29.1mm, neck 14 thickness T 1, the outer diameter D of neck 14 1 is 2.6mm, because voltage endurance, the interval P1 of the inner surface of neck 14 and electrode 19 is necessary for 1mm, in order to keep the intensity of electrode 19, be necessary for 1mm apart from S1 between the electron beam through-hole end of electrode 19 and electrode 19 ends, the interval G1 of each electron beam through-hole of electrode 19 is necessary for 0.4mm, so the maximum diameter of hole MH of horizontal direction electron beam through-hole is about 6.3mm.On the other hand, for vertical direction, if the minimum thickness T2 of insulation supporting rod 18 is 2.8mm, width W 1 is 12mm, and is same because voltage endurance, the minimum interval L1 that neck 14 and insulation supporting rod are 18 is necessary for 1mm, so the interval L2 that the insulation supporting rod is 18 is about 13mm, and is same, because voltage endurance, the interval L3 that electrode 19 and insulation supporting rod are 18 is necessary for 1mm, so the maximum diameter of hole MV of vertical direction electron beam through-hole is about 9mm.
When electron beam through-hole is mechanically made maximum separately, the comparable horizontal direction in aperture of the electron beam through-hole of vertical direction big, but in case form such electron beam through-hole, then with vertical direction big astigmatism is arranged all in the horizontal direction, therefore, electron beam through-hole is made the circle with the diameter that approaches horizontal direction electron beam through-hole maximum diameter of hole MH usually.But, when forming non-circular electron beam through-hole in order to form asymmetric electric field, make the aperture change of electron beam through-hole just can reduce spherical aberration greatly, thereby make horizontal direction keep its limit size, make the aperture of electron beam through-hole of the vertical direction of surplus become big, thereby make vertical slot hole, can reduce spherical aberration.Therefore, in the electron gun structure of one embodiment of the invention, its structure is at the electron beam through-hole of the lengthwise of the 6th grid G 6 sides formation of the 5th grid G 5 sides of its 1st target Gm1 and the 2nd target Gm2, can reduce spherical aberration.
Above-mentioned electron gun structure is in when action, applies direct voltage and modulation signal corresponding to image about 100～200V on negative electrode KR, KG, KB, the 1st grounded-grid, and the 2nd grid G 2 applies the voltage about 500～1000V.This negative electrode KR, KG, KB, the 1st grid G 1, the 2 grid G 2 forms three utmost point parts, forms intersection by this three utmost points part electrons emitted bundle.
The 3rd grid G 3 and the 5th grid G 5 are connected in pipe, apply focus voltage, and this focus voltage is that the parabola shaped dynamic electric voltage with the synchronous variation of the electron beam deflecting is superimposed upon on the predetermined direct current voltage about 6～10KV and forms.Again, the 4th grid G 4 is connected in pipe with the 2nd grid G 2, and the 3rd grid G the 3, the 4th grid G 4 and the 5th grid G 5 form attachment lens, prefocus electron beam.
On the 6th grid G 6, apply the final accelerating voltage of about 25～35KV, the voltage of final accelerating voltage about 40% is provided by resistance T on the 1st target Gm1, the voltage of final accelerating voltage about 65% is provided to the 2nd target Gm2 by resistance T equally.By the 5th grid G the 5, the 1st, the 2 target Gm1, Gm2 and the 6th grid G 6 form main lens, finally electron beam are focused on picture.Like this, expand the main lens zone as mentioned above, add high potential gradually to the 6th grid G 6, thus, form bigbore expansion electric field from the 5th grid G 5 by the 1st and the 2nd target Gm1, Gm2.Thereby, by this bigbore expansion electric field lens, can reduce to restraint spot.
Moreover, according to electron gun structure of the present invention,, can obtain uniform beam spot in whole image with electron gun structure was different in the past, become than the big main lens of electron gun structure bore in the past.To this, divide horizontal direction (H direction) and vertical direction (V direction), the effect of the electron beam when describing the main lens portion that passes through this electron gun structure in detail.
At first, in the 5th grid G 5 inside, owing in each electron beam through-hole, do not form plunging (along the wall portion by the hole), thereby (H direction) in the horizontal direction, form the little equipotential line of common curvature at 3 electron beam through-holes; Form than horizontal direction (H direction) equipotential line that curvature is big in vertical direction (V direction).Therefore, form vertical direction (V direction) than horizontal direction (H direction) focusing electric field that focussing force is strong, make the spherical aberration of horizontal direction (H direction), little when being circular port (becoming good) than electron beam through-hole, and, the spherical aberration of vertical direction is identical when being circular hole with electron beam through-hole.
On the other hand, the 5th grid G 5 sides at the 1st target Gm1, form in each electron beam through-hole along wall portion by the hole, and form the electron beam through-hole of vertical direction (V direction) lengthwise bigger, so form than horizontal direction (H direction) equipotential line that curvature is little in vertical direction (V direction) than horizontal direction (H direction) aperture.Therefore, form vertical direction (V direction) divergencing field more weak than horizontal direction (H direction) disperse function, make the spherical aberration of vertical direction (V direction), little when being circular hole than electron beam through-hole, and the spherical aberration of horizontal direction (H direction) is identical when being circular hole with electron beam through-hole.
So between the 5th grid G 5 and the 1st target Gm1, the focussing force that forms vertical direction (V direction) is than the strong focusing electric field of horizontal direction (H direction).Spherical aberration in level, vertical direction is roughly the same and little when all being circular hole than electron beam through-hole.Equally, between the 6th grid G 6 and the 2nd target Gm2, form vertical direction (V direction) than the strong divergencing field of horizontal direction (H direction), the spherical aberration of level, vertical direction is roughly the same and little when all being circular hole than electron beam through-hole.
Thereby, at the picture middle body, above-mentioned focusing electric field and divergencing field balance, the equal stigmatic of (H direction) and vertical (V direction) in the horizontal direction, electron beam focuses on same position, horizontal direction (H direction) is roughly the same with the spherical aberration of vertical direction (V direction), thereby horizontal direction (H direction) is roughly the same with the beam spot bore of vertical direction (V direction).Moreover the spherical aberration the when spherical aberration of horizontal direction (H direction) and vertical direction (V direction) all is circular hole than electron beam through-hole is little, can reduce electron beam spot.Promptly in this electron gun structure, different with the prior art example, electron beam spot can be circle, and the bundle spot bore in the comparable prior art example of electron beam spot bore is little.
Then, at the electron beam deflecting during to the picture periphery, dynamic electric voltage superposes on the focus voltage, than predetermined value height, approach the voltage that adds on the 1st target Gm1, the electron lens that forms between the 1st target Gm1 of the 5th grid G 5 and adjacency dies down, and the focussing force of vertical direction (V direction) dies down.On the other hand, the electron lens that forms between the 2nd target Gm2 of the 6th grid G 6 and adjacency does not change, thereby main lens integral body, the focussing force of vertical direction (V direction) dies down, and can compensate the vertical direction (V direction) that influenced by the deflecting coil non-uniform magnetic-field and cross focus state.So, can make the beam spot of picture periphery not produce deflection distortion, form the circular electron beam spot.
Therefore, according to this electron gun structure, electron beam is (H direction) and the equal stigmatic of vertical direction (V direction) in the horizontal direction, can make the spherical aberration of horizontal direction (H direction) and vertical direction (V direction) roughly the same and all diminish, can obtain evenly in whole image, circular and very little beam spot, thereby can increase substantially the exploring degree.
Even when the size of cathode ray tube and deflection angle become big, in electron gun structure of the present invention, for the 4 extremely son effects that form between the 1st target Gm1 that strengthens the 5th grid G 5 and adjacency, for example, the circular electron beam that forms in the 1st target Gm1 side of the 5th grid G 5 is become by the hole grows crosswise, the electron beam through-hole that makes the lengthwise that forms in the 5th grid G 5 sides of the 1st target Gm1 is lengthwise more, can not make the spherical aberration deterioration and strengthens 4 extremely son effects.As a result, can eliminate the distortion of the beam spot of prior art generation, obtain the beam spot of circular.
In the above-described embodiments,, also be applicable to other electron gun structures such as biopotential type, unipotential type though be that electron gun structure to four electric potential types is illustrated again.
As mentioned above, color cathode ray tube of the present invention comprises: have the electron gun structure that generation one is listed as the electron beam generating unit of 3 beam electrons bundles of configuration, this electron beam generating unit electrons emitted bundle is finally focused on fluoroscopic main lens; Be configured near the resistance of electron gun structure in the pipe.This main lens is made of the focusing electrode, target and the final accelerating electrode that dispose in turn from electron beam generating unit side direction phosphor screen direction, form 3 electron beam through-holes of a row configuration corresponding with 3 beam electrons bundles.Be taken as the high pressure that offers final accelerating electrode by electric resistance partial pressure as fruit structure, predetermined voltage is offered target, make the focusing electrode that constitutes main lens, the voltage of target and final accelerating electrode, raise in turn from electron beam generating unit side direction phosphor screen direction, and the electron beam through-hole of the target side of the target side of focusing electrode and final accelerating electrode is taken as the perforate that does not form side wall portion, and make with the focusing electrode side of the target of focusing electrode adjacency and with the electron beam through-hole of the final accelerating electrode side of the target of final accelerating electrode adjacency and form the vertical direction vertical slot hole longer than horizontal direction, then same with electron gun structure in the past, by target expansion main lens, thereby form bigbore expansion electric field lens, and between the target of the 5th grid and adjacency, form the vertical direction focusing electric field stronger than horizontal direction focussing force, between the target of the 6th grid and adjacency, form the vertical direction emission electric field stronger than horizontal direction disperse function, at the picture middle body, two kinds of electric field balances, at the picture peripheral part, electron lens between the target of the 5th grid and adjacency dies down, the focussing force of vertical direction is died down, can compensate the vertical direction that influenced by the deflecting coil non-uniform magnetic-field and cross focus state.Moreover, to compare with electron gun structure in the past, the spherical aberration that can make horizontal direction is deterioration not, and the spherical aberration of vertical direction is good.Therefore, the spherical aberration of horizontal direction and vertical direction is roughly the same and all good, the result, and the beam spot bore of horizontal direction and vertical direction is roughly the same, can on whole image, obtain evenly, circular and very little beam spot, can increase substantially the exploring degree.Moreover, even when the size of cathode ray tube and deflection angle become big, also can not make the spherical aberration deterioration and strengthen 4 extremely son effects, thereby can eliminate the distortion of the beam spot that prior art produces, obtain the beam spot of circular in whole image.
Claims (2)
1. color cathode ray tube, it comprises:
Has the shell that forms fluoroscopic panel;
Electron gun structure, contain generation and produce means, and the described electron beam that described electron beam generating unit is launched is finally focused on main lens on the phosphor screen by the electron beam of central electron beam that is in same horizontal plane and the 3 beam electrons bundles that a pair of side electron beam is formed, form a line; It is characterized in that,
Described main lens is by constituting from focusing electrode, at least 1 target and the final accelerating electrode that forms 3 electron beam through-holes of the row configuration gradate of the described phosphor screen direction of described electron beam generating unit side direction, corresponding with described 3 beam electrons bundles;
Its structure is taken as the high pressure that is offered described final accelerating electrode by described electric resistance partial pressure, provide predetermined voltage to described target, make the voltage of the described focusing electrode, described target and the described final accelerating electrode that constitute described main lens, increase in turn from the described phosphor screen direction of described electron beam generating unit side direction, and will be taken as the vertical direction vertical slot hole longer in abutting connection with the focusing electrode side of the described target of described focusing electrode and in abutting connection with the described electron beam through-hole of the final accelerating electrode side of the described target of described final accelerating electrode than horizontal direction;
This color cathode ray tube also comprises being arranged on manages near the resistance of interior described electron gun structure.
2. color cathode ray tube as claimed in claim 1 is characterized in that, the focus voltage and the electron beam deflecting that offer described focusing electrode change synchronously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99111919 CN1243331A (en) | 1998-07-27 | 1999-07-27 | Colour cathode-ray tube |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP211112/98 | 1998-07-27 | ||
| CN 99111919 CN1243331A (en) | 1998-07-27 | 1999-07-27 | Colour cathode-ray tube |
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| Publication Number | Publication Date |
|---|---|
| CN1243331A true CN1243331A (en) | 2000-02-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99111919 Pending CN1243331A (en) | 1998-07-27 | 1999-07-27 | Colour cathode-ray tube |
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| CN (1) | CN1243331A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1299317C (en) * | 2003-01-21 | 2007-02-07 | 中华映管股份有限公司 | Electron gun possessing multilayer common lenses |
| CN100351979C (en) * | 2003-08-22 | 2007-11-28 | 上海永新彩色显像管股份有限公司 | High-voltage testing method for high-voltage distributor of color kinescope and quasi-equivalent apparattus therefor |
-
1999
- 1999-07-27 CN CN 99111919 patent/CN1243331A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1299317C (en) * | 2003-01-21 | 2007-02-07 | 中华映管股份有限公司 | Electron gun possessing multilayer common lenses |
| CN100351979C (en) * | 2003-08-22 | 2007-11-28 | 上海永新彩色显像管股份有限公司 | High-voltage testing method for high-voltage distributor of color kinescope and quasi-equivalent apparattus therefor |
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