CN1079576C - Electron gun for a color cathode ray tube - Google Patents
Electron gun for a color cathode ray tube Download PDFInfo
- Publication number
- CN1079576C CN1079576C CN94105518A CN94105518A CN1079576C CN 1079576 C CN1079576 C CN 1079576C CN 94105518 A CN94105518 A CN 94105518A CN 94105518 A CN94105518 A CN 94105518A CN 1079576 C CN1079576 C CN 1079576C
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- CN
- China
- Prior art keywords
- electron beam
- electron
- utmost point
- electron gun
- ray tube
- 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.)
- Expired - Fee Related
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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
- H01J29/503—Three or more guns, the axes of which lay in a common plane
Landscapes
- Video Image Reproduction Devices For Color Tv Systems (AREA)
- Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
Abstract
An electron gun for a color cathode ray tube having a cathode, a control electrode and a screen electrode together constituting of a triode, and a main lens for focusing and accelerating an electron beam formed by the triode. The electron gun is characterized by a horizontally elongated electron beam passing hole formed in the control electrode having its long axis disposed in the arrangement direction of the electron beam passing hole. A horizontally elongated slot encompassing the electron beam passing hole having its long axis disposed in the arrangement direction of the electron beam passing hole is formed in the screen electrode opposed to the control electrode, thereby preventing the focusing characteristics of the electron beam from being reduced throughout the surface of the fluorescent layer by the influence of the deflection yoke.
Description
The present invention is relevant with the electron gun of color cathode ray tube.Specifically, the present invention proposes a kind of electron gun of color cathode ray tube, this electron gun can reduce that vertical electron beam is got on the phosphor screen by the non-uniform magnetic-field overfocus of deflecting coil the time and the electron-baem spot that produces is fuzzy.
Usually, the electron gun of color cathode ray tube is installed in the neck of cathode ray tube, is used for emitting electrons.It has a negative electrode, a control utmost point and a screen grid, and these three electrodes have constituted first three utmost point, also has one group of focusing electrode that electron beam is focused on and quickens and negative electrode.Three circular holes that can allow electron beam pass through have all been opened on each electrode.
Because the colour cathode-ray tube electron gun of routine with said structure is to focusing on and quicken not change its surface configuration from the electron beam that negative electrode produced, therefore, when being offset to the fluorescence coating edge under the effect of electron beam at deflecting coil, non-uniform magnetic-field will make the electron beam distortion, thereby can not obtain image clearly.
In order to address this problem, prior art is: open the long groove 12a of a horizontal direction on the emitting surface near the screen grid 12 of controlling the utmost point 11 of first three utmost point, as shown in Figure 1, be used for proofreading and correct the influence of deflecting coil non-uniform magnetic-field.
As mentioned above, can reduce the spherical aberration and the vertical deflection distortion that among main lens M and deflecting magnetic field, cause at the flat elongated slot 12a of emitting side boiling water of screen grid 12, yet, this need add prefocus lens P and strengthen, thereby improved the prefocus multiple, the beam radius among the prefocus lens P is reduced.The result is that the virtual object point of vertical electron beam increases, and causes getting to the radius increase of the electron-baem spot on the panel S.Therefore, though reduce to some extent in panel center deflection distortion, because in the increase of the electron-baem spot radius at center, overall resolution power has still descended, and near the most important part of cathode ray tube just of the middle section the panel center.That is to say, though can improve at the marginal portion of panel image resolution, be to have reduced at the middle body resolving power of panel.
In order to address the above problem, such as in U.S. Patent No. 4,629, the prior art that is disclosed in 933 is: the hole of passing through electron beam 21 of the control utmost point 20 is split into the long shape of horizontal direction, and on the emitting surface of the control utmost point 20, form a vertical elongated slot 22, as shown in Figure 3, thus form and utilized horizontal crosspoint and square crossing point.Yet this can reduce focusing performance in big galvanic areas.In addition,, therefore during fabrication, perhaps groove 22 is opened, perhaps the control utmost point 20 is handled with extrusion process again this member being soldered on the member on the control utmost point 20 owing to must on the very thin control utmost point 20, form groove 22.Yet if form groove 22 by member being soldered on the control utmost point 20, a crucial factor-electron beam centering situation that influences the electron gun quality will degenerate.In addition, be very difficult for making electrode with the extrusion process control utmost point 20.
In order to overcome the above problems, the present invention has released a kind of can the compensation because the electron gun of the color cathode ray tube of the electron beam distortion that the non-uniform magnetic-field of deflecting coil causes.
Second purpose of the present invention is to release a kind of focus characteristics electron gun of improved color cathode ray tube all on whole face.
In order to achieve the above object, the electron gun of the color cathode ray tube that the present invention released has a negative electrode that constitutes first three utmost point, a control utmost point and a screen grid, and the main lens that the electron beam that this first three utmost point is formed focuses on and quickens.The feature of this electron gun is: opened the long hole of passing through electron beam of horizontal direction in control extremely, its major axis is configured in the orientation by the hole of electron beam, and on screen grid extremely relative that side with control form horizontal direction long, around the groove in the hole by electron beam, the major axis of groove is configured in the orientation by the hole of electron beam.
Above-mentioned purpose of the present invention and advantage are by detailed description of preferred embodiments will be clearer in conjunction with the following drawings.In these accompanying drawings:
Fig. 1 is the fragmentary, perspective view of first three utmost point of conventional colour cathode-ray tube electron gun;
Fig. 2 is first three utmost point of conventional electrical rifle and the level and the vertical projection diagram of electron beam;
Fig. 3 is first three utmost point fragmentary, perspective view of another kind of conventional electrical rifle;
Fig. 4 is the decomposition diagram of first three utmost point of colour cathode-ray tube electron gun of the present invention;
Fig. 5 is the decomposition diagram of another kind of embodiment of the screen grid of electron gun of the present invention;
Fig. 6 is level and the vertical sectional view that benchmark is got with the center line for first three utmost point of electron gun of the present invention;
Fig. 7 is the trajectory diagram from the vertical and horizontal electron beam of the extremely formed electron lens ejaculation of negative electrode and first three;
Fig. 8 is the trajectory diagram of the vertical and horizontal electron beam of electron gun of the present invention;
Fig. 9 illustrates the curve chart that concerns between vertical electron-baem spot size of electron gun and the electric current; And
Figure 10 is that the electron beam that projects on the main lens is shown horizontal planted the relation between the horizontal width of getting to the electron beam on the fluorescent screen that face horizontal width and ratio enlarged.
Colour cathode-ray tube electron gun of the present invention comprises first three utmost point and one group of electrode that constitutes main lens.First three is negative electrode 31, the control utmost point 32 and screen grid 33 very, as shown in Figure 4.As seen from the figure, on the control utmost point 32, opened the long hole 32H that passes through electron beam of horizontal direction of three alinements.On the incidence surface of the screen grid 33 relative, form three long groove 33S of horizontal direction that surround corresponding hole 33H by electron beam respectively with the control utmost point 32.Opening at the horizontal elongated hole 32H of control on the utmost point 32 can be that major axis is in rectangular opening or the slotted eye in the orientation in the hole by electron beam, and it is oval-shaped also can having only a side.Formed horizontal elongated slot 33S can form by making each being recessed into of hole 33H by electron beam on every side on screen grid 33, also can be as shown in Figure 5, by with one have horizontal direction the electrode member 40 in the long hole of passing through electron beam 41 be fixed on the incidence surface of screen grid 33 and form.
To have as above that the working condition of the colour cathode-ray tube electron gun of structure is illustrated to of the present invention below.
When adding corresponding current potential on each electrode, electronics just comes out from negative electrode 31 thermal radiations.Because the lateral aperture 32H that opens on the control utmost point 32 is longer in the horizontal direction, and is therefore just less from the vertical section in the Fu Zai district that electron beam passed through that negative electrode 31 emits.Like this, less from the aberration that negative electrode 31 electrons emitted bundles produce during displayed image on getting to phosphor screen, thus the radius of vertical object point is also less.
In addition, from Fig. 6 and 7 as seen, near negative electrode 31, this is because vertical cathode lens L1 is stronger than horizontal cathode lens than horizontal crosspoint P2 in the position of square crossing point P1.Therefore, the vertical component of electron beam is subjected to by screen grid 33 and to be installed in the effect of the prefocus lens L3 that contiguous focusing electrode (not shown) forms stronger, thereby has stronger first three utmost point effect that reduces aberration.
On the contrary, because the horizontal crosspoint P2 that forms is near prefocus lens 23, so the horizontal component of electron beam requires the focussing force of more weak prefocus lens L3, thereby incides on the main lens with bigger incidence angle.Simultaneously, as shown in Figure 6, because the horizontal direction that forms on the incidence surface of screen root 33 is the effect of long groove 33S, the incidence angle in electron beam vertical component crosspoint little when not having groove 33S, thereby reduced electron beam in prefocus lens L3 at the width of vertical direction, get rid of the factor that vertical object point radius is increased by the effect of high power prefocus lens, improved the focus characteristics of big Current Zone.
By above-mentioned effect, make the cross sectional shape that incides the electron beam on the main lens become long in the horizontal direction ellipse, as shown in Figure 8.Therefore, because electron beam width in vertical direction is less in these lens M, thereby pass the middle body of main lens M, so spherical aberration is also less.In addition owing to reduced to pass the electron beam width in vertical direction of deflecting coil non-uniform magnetic-field, so electron beam vertical direction suffered because the deflection aberration that the influence of the vertical deflecting magnetic field of focousing field formation produces is less.As a result, just can avoid focus to surpass the focusing performance decline that face causes.
Fig. 9 shows electric current and beats relation between the vertical width of the electron-baem spot of face core.As seen from the figure, the vertical width of the electron-baem spot of the electron gun of the present invention shown in the chain-dotted line 100 is less than the vertical width of the electron-baem spot of the electron gun of the routine shown in the solid line 200.This just means, compares with the conventional electrical rifle, and the electron beam of electron gun of the present invention focus characteristics in vertical direction is improved.
Simultaneously, with regard to negative electrode 31 electrons emitted bundles focus characteristics in the horizontal direction, be that a condenser lens is compared with main lens M, the horizontal deflecting magnetic field that deflecting coil forms is a divergent magnetic field, so the automatic self focusing of electron beam.Like this, though the horizontal width of electron beam in main lens M is bigger, also can obtain extraordinary focus characteristics.
Figure 10 show electron beam in main lens horizontal width and get to relation between the size of the electron-baem spot on the phosphor screen.As shown in the figure, the horizontal width of electron beam in main lens is big more, and then the width of getting to the electron-baem spot on the phosphor screen of ratio expansion is just more little.
As mentioned above, electron gun according to the color cathode ray tube that the present invention released, be split into the long shape of horizontal direction and on the incidence surface extremely relative of screen grid, form the long groove of horizontal direction by the hole of passing through electron beam that will control the utmost point with control, make the crosspoint of vertical component of electron beam and the crosspoint of horizontal component separate, thereby incide the cross sectional shape ovalize of the electron beam on the main lens, therefore formed less object point width in vertical direction, prevented that focus characteristics from descending to some extent in the phosphor screen center.In addition, owing to the deflection aberration that can reduce influenced by deflecting coil and cause, therefore also guaranteed focus characteristics in phosphor screen edge.
The present invention be not limited to above for electron gun embodiment, but can be used for first three utmost point of the electron gun of various alinement types, although it is different to constitute the connection of each utmost point of these electron guns.
Claims (4)
1. colour cathode-ray tube electron gun, this electron gun has a negative electrode (31), control the utmost point (32) and a screen grid (33) for one, these three utmost points have constituted first three utmost point together, also has the main lens that the formed electron beam of first three grade is focused on and quickens, the feature of described electron gun is: opened a hole of passing through electron beam (32H) that horizontal direction is long on the described control utmost point (32), its major axis is configured on the aligning method by the hole of electron beam, and on the screen grid (33) relative, be formed with hole by electron beam with the described control utmost point (32), the groove (33S) that the horizontal direction that forms on the incidence surface of screen grid (33) is long surrounds the hole by electron beam, and its major axis is configured in the orientation by the hole of electron beam.
2. one kind as the colour cathode-ray tube electron gun that proposed in claim 1 is characterized in that: wherein said the long groove (33S) of the horizontal direction that forms on the incidence surface of screen grid (33) be by one is had horizontal direction the electrode member in the long hole of passing through electron beam (33H) be attached on the incidence surface of screen grid (33) and form.
3. one kind as the colour cathode-ray tube electron gun that proposed in claim 1, it is characterized in that: the wherein said hole of passing through electron beam (32H) of opening on the control utmost point (32) is a rectangular opening.
4. one kind as the color cathode ray tube that proposed in claim 1, it is characterized in that: the groove (33S) that the wherein said horizontal direction that forms on the incidence surface of screen grid (33) is long is a rectangular channel.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR22019/93 | 1993-10-22 | ||
| KR1019930022019A KR100189830B1 (en) | 1993-10-22 | 1993-10-22 | Electron gun for color braun tube |
| KR32276/93 | 1993-12-31 | ||
| KR1019930032276A KR0170223B1 (en) | 1993-12-31 | 1993-12-31 | Electronic gun for color cathode tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1108428A CN1108428A (en) | 1995-09-13 |
| CN1079576C true CN1079576C (en) | 2002-02-20 |
Family
ID=26629954
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN94105518A Expired - Fee Related CN1079576C (en) | 1993-10-22 | 1994-05-16 | Electron gun for a color cathode ray tube |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH07130299A (en) |
| CN (1) | CN1079576C (en) |
| DE (1) | DE4416692A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09245665A (en) * | 1996-03-05 | 1997-09-19 | Sony Corp | Beam control electrode, electron gun using the same, cathode-ray tube using electron gun, and manufacture of beam control electrode |
| KR100281046B1 (en) * | 1997-04-10 | 2001-03-02 | 구자홍 | Electron gun for color cathode ray tube |
| KR100759545B1 (en) * | 2001-09-29 | 2007-09-18 | 삼성에스디아이 주식회사 | Electron gun for the cathode ray tube |
| KR100869100B1 (en) * | 2002-12-23 | 2008-11-17 | 삼성에스디아이 주식회사 | Electron gun for color cathode ray tube |
| JP2004265604A (en) | 2003-01-15 | 2004-09-24 | Toshiba Electronic Engineering Corp | Cathode-ray tube device |
| KR100629525B1 (en) * | 2003-10-23 | 2006-09-27 | 엘지.필립스 디스플레이 주식회사 | Cathode ray tube |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4523123A (en) * | 1983-05-06 | 1985-06-11 | Rca Corporation | Cathode-ray tube having asymmetric slots formed in a screen grid electrode of an inline electron gun |
| US4629933A (en) * | 1983-05-06 | 1986-12-16 | U.S. Philips Corporation | Cathode-ray tube having an electron gun with an astigmatic focusing grid |
| US4736133A (en) * | 1986-04-24 | 1988-04-05 | Rca Corporation | Inline electron gun for high resolution display tube having improved screen grid plate portion |
| US5126625A (en) * | 1989-12-31 | 1992-06-30 | Samsung Electron Devices Co., Ltd. | Multistep focusing electron gun for cathode ray tube |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06283112A (en) * | 1993-03-29 | 1994-10-07 | Mitsubishi Electric Corp | Electron gun |
-
1994
- 1994-05-10 JP JP9641994A patent/JPH07130299A/en active Pending
- 1994-05-11 DE DE19944416692 patent/DE4416692A1/en not_active Withdrawn
- 1994-05-16 CN CN94105518A patent/CN1079576C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4523123A (en) * | 1983-05-06 | 1985-06-11 | Rca Corporation | Cathode-ray tube having asymmetric slots formed in a screen grid electrode of an inline electron gun |
| US4629933A (en) * | 1983-05-06 | 1986-12-16 | U.S. Philips Corporation | Cathode-ray tube having an electron gun with an astigmatic focusing grid |
| US4736133A (en) * | 1986-04-24 | 1988-04-05 | Rca Corporation | Inline electron gun for high resolution display tube having improved screen grid plate portion |
| US5126625A (en) * | 1989-12-31 | 1992-06-30 | Samsung Electron Devices Co., Ltd. | Multistep focusing electron gun for cathode ray tube |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1108428A (en) | 1995-09-13 |
| JPH07130299A (en) | 1995-05-19 |
| DE4416692A1 (en) | 1995-04-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20020220 |