CN1118932A - Electron gun for color cathode ray tube - Google Patents
Electron gun for color cathode ray tube Download PDFInfo
- Publication number
- CN1118932A CN1118932A CN94117168A CN94117168A CN1118932A CN 1118932 A CN1118932 A CN 1118932A CN 94117168 A CN94117168 A CN 94117168A CN 94117168 A CN94117168 A CN 94117168A CN 1118932 A CN1118932 A CN 1118932A
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- CN
- China
- Prior art keywords
- electron beam
- electrode
- focusing electrode
- focusing
- electron
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
- H01J29/48—Electron guns
- H01J29/50—Electron guns two or more guns in a single vacuum space, e.g. for plural-ray tube
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
- H01J29/48—Electron guns
- H01J29/50—Electron guns two or more guns in a single vacuum space, e.g. for plural-ray tube
- H01J29/503—Three or more guns, the axes of which lay in a common plane
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
- H01J29/54—Arrangements for centring ray or beam
Abstract
An electron gun for a color cathode ray tube is including a control electrode, an accelerating electrode, an anode, and a first and a second focusing electrode. A static focusing voltage predetermined independently of a deflection period is applied to the first focusing electrode and a dynamic focusing voltage varying according to the deflection period is applied to the second focusing electrode. The first focusing electrode has three electron beam apertures with vertical parallel plates mounted around each aperture in a direction opposite to the direction of the electron beams. The centers of the left and right electron beam apertures are offset to the left and right sides of the central axis of the vertical and horizontal parallel plates. This configuration allows easy assembly and produces a vertical elongated electron beam even with low dynamic voltage Vd and thereby improves the focus form of the electron beam.
Description
The present invention relates to a kind of electron gun of color cathode ray tube, be particularly related to a kind of like this electron gun, it all has uniform static convergence characteristic on whole screen, and assembling easily, even electron beam is extended satisfactorily, thereby improved the focus form of electron beam with low dynamic electric voltage.
Cathode ray tube comprises: the electron gun that produces electron beam; The deflection system of the above-mentioned electron beam of deflection; The shadow mask of controlling electron beam drop point; With the screen dish that is coated with fluorescent material on it, this fluorescent material is luminous during by beam bombardment, and is applicable to various display devices, kinescope for example, computer monitor and similar device.
Usually, the resolution of above-mentioned cathode ray tube is subjected to the influence of the size and dimension of electron gun institute electrons emitted bundle, unless beam diameter is little, and the beam shapes sub-circular, otherwise just can not obtain high-quality resolution.
In the monofocal type cathode ray tube of routine, as shown in Figure 1, when electron beam by unbalanced magnetic deflection field deflection, for example by pincushion field horizontal deflection D
H, by barrel field vertical deflection D
vSo that during auto-convergence, the size or the shape of electron beam distort, thereby cause the problem that color cathode ray tube periphery image quality degenerates, as shown in Figure 2.
As shown in Figure 1, the deflection power of along continuous straight runs deflection beam pincushion field D
HAt vertical direction focused beam and formation point 1, vertically be compressed so shield image, vertically the deflection power of deflection beam barrel field D
vThe along continuous straight runs divergent bundle also forms point 2, so screen image is stretched together along level side.
Therefore, electron beam bears the effect of vertical focusing power and horizontal divergence power and produce as shown in Figure 2 halation on screen, and resolution is worsened.
For addressing the above problem, a kind of like this method is arranged, the shape that is about to the electron beam of color cathode ray tube central authorities intentionally makes it distortion, and in the distortion of sizable zone, so that the marginal portion of screen is compensated.But this method exists the central authorities of color cathode ray tube to produce the resolution deterioration problem.
Therefore, as solution to the problems described above, developed the dynamic focusing type and be double focus type electron gun and be put to and used, the deflection current of this double focus type electron gun and deflecting coil is synchronous and change the shape of electron beam along with the variation of electron beam focal length.
The exercise question of announcing August 24 nineteen ninety has disclosed the technology of above-mentioned dynamic focusing type electron gun for the 92-3357 korean patent application of " electron gun of color picture tube " for the 90-6172 korean patent application of " color cathode ray tube " and the exercise question announced on April 30th, 1994.
Above-mentioned color cathode ray tube comprises a plurality of electron guns and the deflecting coil that is installed on the shell outer wall that are arranged on glass sealing body neck.
Each electron gun is by one group of negative electrode arranging along tube axial direction in order, one group of accelerating electrode, one group of prefocusing electrode, focusing electrode is formed after one group.
The prefocusing electrode comprises that along tactic first and second grids of tube axial direction they all have the hole of passing through for electron beam.One predetermined focus voltage is added to first grid, and the dynamic focus voltage that slowly changes with the variation of the amount of deflection of electron beam is added to second grid.
Therefore electron beam focuses on to the electron beam axioversion.
In addition, above-mentioned colorful visualization tube electron gun serves as that the basis also comprises a control electrode, an accelerating electrode, a focusing electrode and the anode along the electron gun axially-aligned with divergent bundle and along the negative electrode that horizontal scan direction is arranged.
Wherein above-mentioned focusing electrode is made of second focusing electrode that is positioned near first focusing electrode the above-mentioned accelerating electrode and be positioned at around the above-mentioned anode.
First focusing electrode has and corresponding three the vertical circular electron beam holes of electron beam number, these electron beam holes promptly support along the vertical panel that the direction of first focusing electrode bonds on second focusing electrode with a plurality of parallel-plate electrodes, in addition, these parallel-plate electrodes are encircled the frame electrodes surrounding, the electron beam quantity included with horizontal direction is corresponding, perhaps promptly bond to horizontal plate on second focusing electrode along the first focusing electrode direction with a pair of or three pairs of parallel-plate electrodes, along dispose direction perpendicular to electron beam is three circular electron beam holes of vertical direction supporting, thereby the both sides electron beam hole that makes each electrode has identical distance apart from the axle of electron gun, and this just can be assembled into does not have the I-shaped electron gun that is offset.
Yet, above-mentioned conventional dynamic focusing type electron gun assembling difficulty, and and if only if the peak-to-peak value of dynamic electric voltage reaches predetermined voltage or when higher, the beam cross section shape could be longer in vertical direction.
The objective of the invention is to solve the existing problem of color cathode ray tube of band static convergence, its static convergence of electron gun of the present invention is uniform on whole screen, also be to assemble easily, electron beam is extended under low dynamic electric voltage satisfactorily, thereby improve the electron beam focus form.
For reaching this purpose, the preferred embodiments of the present invention provide a kind of electron gun of color cathode ray tube, and this electron gun comprises: a control electrode; One accelerating electrode; One anode; With a focusing electrode that is divided into first and second focusing electrodes.One is added on first focusing electrode near the control utmost point and intensifying ring with the irrelevant predetermined static focus voltage of deflection cycle, and the dynamic focus voltage of the parabolic waveform that changes with deflection cycle is added near second focusing electrode that is positioned at the anode.First focusing electrode has three electron beam holes, with the equidistant edge direction opposite with beam direction vertical parallel plates is installed around each electron beam hole.The relative vertical parallel plates center, center of the left and right sides electron beam hole in three holes is each same partially degree to the left and right.Because from the electron beam hole center of centre to the distance at each electron beam hole center, the left and right sides greater than the distance the vertical parallel plates center.
Can further understand the present invention by detailed description below in conjunction with accompanying drawing.
Fig. 1 illustrates the electron beam distortion that the barrel field of the pincushion field of the horizontal direction that is produced by the self-convergent system deflecting coil and vertical direction causes;
Fig. 2 illustrates because the electron beam distortion makes cathode ray tube peripheral part image quality deterioration problem;
Fig. 3 illustrates the state that is installed in the cathode ray tube rear end part according to preferred embodiment of the present invention colour cathode-ray tube electron gun;
Fig. 4 is the structure chart of the colour cathode-ray tube electron gun of the preferred embodiment of the present invention;
Fig. 5 is the front view and the plane graph of first focusing electrode of the colour cathode-ray tube electron gun of the preferred embodiment of the present invention;
Fig. 6 is the front view and the plane graph of second focusing electrode of the colour cathode-ray tube electron gun of the preferred embodiment of the present invention;
Fig. 7 illustrates by CRT electrom gun electrons emitted bundle and extends in vertical direction by focusing electrode;
Fig. 8 is added to voltage waveform on colour cathode-ray tube electron gun first and second focusing electrodes according to the preferred embodiment of the present invention.
Fig. 3 illustrates colour cathode-ray tube electron gun is installed in the cathode ray tube rear end part according to the preferred embodiments of the present invention state.
As shown in Figure 3, cathode ray tube comprises: apply the screen dish 5 of fluorescent material on it, said fluorescent material is luminous when beam bombardment, and shadow mask also is housed on it; Funnel 4 with band or similar material and 5 combinations of screen dish; Be installed in the deflecting coil 3 of funnel 4 necks; And sealing is installed in the electron gun 6 of funnel 4 rear end parts.
Fig. 4 illustrates the structure according to the colour cathode-ray tube electron gun of the preferred embodiment of the present invention.
As shown in Figure 4, the electron gun of the color cathode ray tube of the preferred embodiments of the present invention comprises: a control electrode 10 has the electron beam hole that passes through for electron beam on it; One accelerating electrode 20 has the electron beam hole that passes through for the electron beam by control electrode 10 on it; First focusing electrode 30 has the vertical parallel plates 31 of stretching out along the direction opposite with beam direction on its left and right electron beam hole and since between left and right hole and the medium pore center apart from S
2Greater than between the center, left and right hole of the control utmost point 10 and intensifying ring 20 and the medium pore apart from S
1So left and right sides Kong Shi is to two lateral deviations; Second focusing electrode 40, it respectively on three electron beam through-holes the lower edge direction opposite with beam direction stretch out, and a horizontal andante 41 is arranged, this parallel-plate 41 inserts the electron beam hole of above-mentioned first focusing electrode 30, and is not electrically connected with above-mentioned first focusing electrode 30; One anode 50; With thermionic emission part 60 shown in Figure 3.
Fig. 5 is front view and the plane graph according to first focusing electrode of the colour cathode-ray tube electron gun of the preferred embodiment of the present invention.
As shown in Figure 5, first focusing electrode 30 comprises: highly for W, length are the vertical parallel plates 31 of L, it is installed along the direction opposite with beam direction with the spacing that equates; Three square electron beam holes, they are formed between the vertical parallel plates.Distance from the center of central electron beam hole H-C to the center of left and right electron beam hole H-S is greater than the distance the center of the vertical parallel plates of installing with equidistant from distance, so left and right electron beam hole is to two lateral deviations, with respect to vertical parallel plates 31 left and right sides electron beam holes each (dc-ds) partially to the left and right.
Fig. 6 is front view and the plane graph according to second focusing electrode of the colour cathode-ray tube electron gun of the preferred embodiment of the present invention.
As shown in Figure 6, second focusing electrode 40 of the present invention comprises: width is that DH, length are the horizontal andante 41 of DL, their along the direction opposite with beam direction with identical interval S
1Be installed on the top and the bottom of three electron beam holes, up and down between the distance be DW; The circular electron beam hole constitutes between the horizontal andante on upper and lower limit respectively.Distance from the center of central electron beam hole to the center of left and right electron beam hole equates.
Because the horizontal andante 41 of above-mentioned second focusing electrode 40 must inject electron beam holes in electric insulation ground, so the width D H of horizontal andante 41, highly DW must be processed into littler than the size of electron beam hole H-C, the H-S of first focusing electrode 30.
In addition, because the electric field that the horizontal andante 41 of above-mentioned second focusing electrode 40 must form should be the twice of the vertical parallel plates 31 formed electric fields of first focusing electrode 30, so the length DL of the horizontal andante 41 of second focusing electrode 40 will design to such an extent that enough length arranged.
In an embodiment of the present invention, above-mentioned first focusing electrode 30 and vertical parallel plates 31 are used in the coupling component mode, but technical scope of the present invention is not limited thereto, and also can make vertical parallel plates 31 and are welded on other parts with different coupling components.
In addition, in an embodiment of the present invention, above-mentioned second focusing electrode 40 and horizontal andante 41 are used in the separating component mode, but technical scope of the present invention is not limited thereto, and second focusing electrode 40 also can constitute with horizontal parallel slab integral ground.
The course of work corresponding to the electron gun of the color cathode ray tube of the preferred embodiment of the present invention with said structure will provide below.
High voltage source is added on the electron gun 6 of cathode ray tube, launches hot electron and deliver to control electrode 10 from the thermionic emission part 60 of electron gun 6 then.
The amount of control electrode 10 controlling electron beam of electron gun 6, the brightness of screen is controlled by the size that is added to the voltage on the control utmost point 10.
The electron beam in the hole of the control electrode 10 by electron gun 6 is added to accelerating electrode 20, and electron beam is accelerated electrode 20 and quickens, and then this bundle is delivered to first focusing electrode 30.
With the irrelevant static focus voltage V of the deflection cycle 1H of electron beam shown in Figure 8
FsBe added to the vertical parallel plates 31 of first focusing electrode 30, also be added to the horizontal andante 41 of second focusing electrode 40, the dynamic focus voltage V that utilizes as shown in Figure 8 the deflection cycle 1H with electron beam to change
d, and make the focusing electrode of first condenser lens 30 and second condenser lens 40 constitute the dynamic focusing lens.
Fig. 8 is according to the preferred embodiments of the present invention, is added to the oscillogram of the voltage on first and second focusing electrodes of colour cathode-ray tube electron gun.
As shown in Figure 8, above-mentioned dynamic focus voltage V
dBe the voltage that parabolic waveform is arranged, when zero deflection power is added to electron beam, V
dBe minimum value, promptly electron beam is in the central authorities of screen, and this dynamic focus voltage also increased when the deflection power that is added to electron beam increased.
Therefore, be added with static focus voltage V
FsFirst focusing electrode 30 and be added with dynamic focus voltage V
dSecond focusing electrode 40 between form the dynamic focusing lens that change with deflection cycle.
If the hole of the rear end part of electron beam by being positioned at first focusing electrode, when forming dynamic lens as described above at this place, hole, then electron beam becomes as shown in Figure 7 and extends in vertical direction.
Fig. 7 represents that being focused electrode by CRT electrom gun electrons emitted bundle elongates in vertical direction.
In addition, at the central authorities of screen, static focus voltage V
FsSize and dynamic focus voltage V
dEqual and opposite in direction, dynamic lens is not worked, and forms circular electron beam.Yet peripheral part static focus voltage V at screen
FsSize and dynamic focus voltage V
dVary in size, so far away more from the center of screen, electron beam is subjected to the effect of dynamic lens big more and electron beam is pulled in vertical direction.
The phenomenon that first and second focusing electrodes 30 of the present invention and 40 structure are elongated this electron beam as shown in Figure 7 in vertical direction becomes more obvious.
That is to say, if electron beam is by being positioned at the rearward end hole of first focusing electrode 30, then electron beam is elongated in vertical direction effectively, simultaneously because the left and right hole H-S of first focusing electrode 30 to two lateral deviations, and the electric field of being set up at the horizontal andante 41 of second focusing electrode 40 of the top and the bottom of first focusing electrode 30 doubles, so the characteristic changing of static convergence.
Therefore, according to structure of the present invention, electron beam even at dynamic focus voltage V
dStill can sufficiently be stretched in vertical direction during less than the needed voltage of common process.
In addition, since from the center in the left and right hole of first focusing electrode 30 to being installed in the different of vertical parallel plates 31 on the both sides, hole apart from ds, dc, electron beam by left and right hole is very naturally to the central electronic beam convergence, thereby can overcome the decline of resolution under the situation that dynamic electric voltage is added on second focusing electrode 40 or dynamic electric voltage improves; The effect of the main lens that forms between second focusing electrode 40 and anode 50 in the prior art is weakened, thereby overcome the shortcoming that the static convergence characteristic that causes resolution to descend is brought.
The electron beam that extends in vertical direction by first and second focusing electrodes 30,40 is owing to corrected the electron beam distortion that cause the dissymmetrical magnetic field that is produced by the self-convergent system deflecting coil as shown in Figure 1, so can improve the resolution on the whole screen.
Above preferred embodiment provides a kind of electron gun of color cathode ray tube, and this electron gun is assembled easily, even electron beam also can fully be elongated in vertical direction under the dynamic electric voltage of fractional value, thereby the focus form of electron beam can improve.
Effect of the present invention can be used to design, produce and market is as the electron gun of cathode ray tube main element.
Claims (5)
1, a kind of electron gun of color cathode ray tube comprises: a control electrode, an accelerating electrode, an anode and be divided into the focusing electrode of first and second focusing electrodes is characterized in that:
The irrelevant static focus voltage of predetermined and deflection cycle is added near said first focusing electrode that is positioned at the said control utmost point and the intensifying ring, and the dynamic focus voltage of the parabolic waveform that changes with deflection cycle is added near second focusing electrode that is positioned at the anode;
Said first focusing electrode has three electron beam holes, and vertical parallel plates is installed in around each electron beam hole along the direction opposite with beam direction; With
The center of left and right electron beam hole in said three holes because distance from central electron beam hole center to left and right electron beam hole center greater than the distance the vertical parallel plates center, so respectively left, the right is offset same degree.
2, electron gun as claimed in claim 1 is characterized in that:
Said second focusing electrode has three holes that supply electron beam to pass through;
Be equipped with along a pair of horizontal andante of the direction opposite on the upper and lower limit in each hole of said electron beam hole with beam direction; With
Said horizontal andante electric insulation ground injects the electron beam hole of said first focusing electrode.
3, as the said electron gun of claim 1, it is characterized in that from left and right lateral opening center to the parallel-plate of installing along neck wall direction apart from ds less than distance to the parallel-plate of installing by central electronic beam hole direction.
4, as the said electron gun of claim 1, it is characterized in that: be in the other parallel-plate of electron beam hole that the electrode place of said first focusing electrode in the dynamic focus voltage electric field constitutes in the heart apart from S
1Be less than between the electron beam hole that is in the electrode place in the dynamic focus voltage electric field distance or: electron beam distance between borehole S
2Be greater than the distance between the electron beam hole that the electrode place that is added with dynamic focus voltage on it forms.
5, according to the said electron gun of claim 1, it is characterized in that being added with on it between electron beam hole in electrode part of static focus of first focusing electrode apart from S
2Greater than the distance between the electron beam hole that in the accelerating electrode of control electrode, accelerating electrode or first focusing electrode, forms.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019940006924A KR100322443B1 (en) | 1994-04-01 | 1994-04-01 | Electron gun for color cathode ray tube |
| KR946924 | 1994-04-01 | ||
| KR94-6924 | 1994-04-01 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1118932A true CN1118932A (en) | 1996-03-20 |
| CN1061168C CN1061168C (en) | 2001-01-24 |
Family
ID=19380323
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN94117168A Expired - Fee Related CN1061168C (en) | 1994-04-01 | 1994-10-22 | Electron gun for color cathode ray tube |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPH07282740A (en) |
| KR (1) | KR100322443B1 (en) |
| CN (1) | CN1061168C (en) |
| DE (1) | DE19511377A1 (en) |
| GB (1) | GB2288060B (en) |
| TW (1) | TW289121B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012058865A1 (en) * | 2010-11-04 | 2012-05-10 | Dong Shi | Method and device for signal period stretch and ultra-fast serial-to-parallel/parallel-to-serial conversion |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100412521B1 (en) * | 1995-12-30 | 2004-03-18 | 삼성에스디아이 주식회사 | Electron gun for color cathode ray tube |
| KR20160141977A (en) | 2015-06-02 | 2016-12-12 | 김영도 | Ventilator and Leakage Comprobador for preventing a outside leakage of harmful dangerous substance in local area |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4086513A (en) * | 1975-03-03 | 1978-04-25 | Rca Corporation | Plural gun cathode ray tube having parallel plates adjacent grid apertures |
| JPS5911176B2 (en) * | 1980-01-18 | 1984-03-14 | 株式会社日立製作所 | Electrode for electron gun |
| JP2938476B2 (en) * | 1989-09-04 | 1999-08-23 | 松下電子工業株式会社 | Color picture tube equipment |
| JPH05325825A (en) * | 1992-05-21 | 1993-12-10 | Hitachi Ltd | Electron gun for color cathode-ray tube |
-
1994
- 1994-04-01 KR KR1019940006924A patent/KR100322443B1/en not_active IP Right Cessation
- 1994-10-06 TW TW083109279A patent/TW289121B/zh active
- 1994-10-14 JP JP6274308A patent/JPH07282740A/en active Pending
- 1994-10-21 GB GB9421245A patent/GB2288060B/en not_active Expired - Fee Related
- 1994-10-22 CN CN94117168A patent/CN1061168C/en not_active Expired - Fee Related
-
1995
- 1995-03-28 DE DE19511377A patent/DE19511377A1/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012058865A1 (en) * | 2010-11-04 | 2012-05-10 | Dong Shi | Method and device for signal period stretch and ultra-fast serial-to-parallel/parallel-to-serial conversion |
| US10031998B2 (en) | 2010-11-04 | 2018-07-24 | Chongqing Misen Tech Ltd. | Method and device for signal period stretch and ultra-fast serial-to-parallel/parallel-to-serial conversion |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2288060A (en) | 1995-10-04 |
| GB2288060B (en) | 1997-11-26 |
| CN1061168C (en) | 2001-01-24 |
| KR950030199A (en) | 1995-11-24 |
| KR100322443B1 (en) | 2002-06-20 |
| GB9421245D0 (en) | 1994-12-07 |
| DE19511377A1 (en) | 1995-10-05 |
| JPH07282740A (en) | 1995-10-27 |
| TW289121B (en) | 1996-10-21 |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |