CN1405830A - Electdronic gun of colour cathode-ray tube - Google Patents
Electdronic gun of colour cathode-ray tube Download PDFInfo
- Publication number
- CN1405830A CN1405830A CN02127894A CN02127894A CN1405830A CN 1405830 A CN1405830 A CN 1405830A CN 02127894 A CN02127894 A CN 02127894A CN 02127894 A CN02127894 A CN 02127894A CN 1405830 A CN1405830 A CN 1405830A
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- CN
- China
- Prior art keywords
- electrode
- electron gun
- ray tube
- focusing
- coil
- 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
-
- 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
- H01J29/58—Arrangements for focusing or reflecting ray or beam
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2229/00—Details of cathode ray tubes or electron beam tubes
- H01J2229/56—Correction of beam optics
- H01J2229/568—Correction of beam optics using supplementary correction devices
- H01J2229/5681—Correction of beam optics using supplementary correction devices magnetic
- H01J2229/5687—Auxiliary coils
- H01J2229/5688—Velocity modulation
Landscapes
- Details Of Television Scanning (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
Abstract
The present invention discloses an electron gun for a color cathode ray tube. In order to efficiently penetrate a speed modulation magnetic field of a velocity modulation coil, at least two focus electrodes of main electrodes receiving a fixed focus voltage are arranged in a row in the electron gun. When a sum of lengths of the focus electrodes is 'L' and a sum of intervals of the electrodes is 'g', '(gx100)/L = 5 to 30(%)' is satisfied.
Description
Technical field
The present invention relates to the electron gun of a kind of color cathode ray tube (CRT), the particularly a kind of structure of having improved electrode and shape are with the electron gun of the color cathode ray tube of the spot diameter that reduces to influence electron beam and focus on.
Background technology
Fig. 1 is a relevant cathode ray tube schematic diagram.
With reference to Fig. 1, on the tandem electron gun of cathode ray tube, a plurality of electrodes are being set.These electrodes according to predetermined interval, be provided with in vertical direction with the path of electron beam 13, so that the electron beam 13 that produces at negative electrode 3 places can arrive on the phosphor screen 17 according to predetermined strength.
In detail, described a plurality of electrodes comprise one first electrode 4, and it is a common grid of three negative electrodes 3, and other three negative electrodes 3 separate setting with described negative electrode 3; Between one second electrode 5, it and first electrode 4 predetermined space is arranged; A third electrode 6; One the 4th electrode 7; One the 5th electrode 8 and one the 6th electrode 9.
In addition, the 6th electrode 9 is provided with radome 10, and it has BSC11, is used for being electrically connected between electron gun and the cathode ray tube, and the neck that electron gun is fixed on cathode ray tube.
Introduce the working method of electron gun now.In electron gun, electronics is launched from the stem 1 of cathode ray tube by the heater 2 of negative electrode 3.Electron beam 13 is subjected to first electrode 4, i.e. control electrode, control; By second electrode 5, promptly accelerating electrode quickens; And carrying out part by a total space condenser lens that forms between second electrode 5, third electrode 6, the 4th electrode 7 and the 5th electrode 8 focuses on and quickens.
Electron beam mainly is focused and quickens by the 6th electrode 9 and the 7th electrode 10.The 6th electrode 9 is synchronous with defection signal, forms a quadrupole lens, is used to compensate the astigmatism that is produced by deflecting coil, and it receives a transformable voltage and it is that main lens constitute electrode, is called as focusing electrode.The 7th electrode 10 is positive electrodes, the planar masks 15 that electron beam forms by 16 inboards in the face, and impinge upon on the face 16, cause luminous.
Deflecting coil 12 is installed in the outside of electron gun, is used for deflection electron gun electrons emitted bundle 13 whole to phosphor screen 17, thereby forms phosphor screen.
Be positioned at the neck of the cathode ray tube that associated electrical rifle 8 is housed with the synchronous speed modulation coil 18 of the picture signal in the circuit.As a main aspect of the present invention, speed modulation coil 18 is used to dwindle spot diameter.
Aspect the design characteristics of electron gun, the spherical aberration of the amplification of lens, space charge repulsion power and main lens all can influence the spot diameter on the phosphor screen.
Now these characteristics are elaborated.
The variation of the spot diameter Dx that causes owing to the amplification of lens seldom is used as the design factor of electron gun, and its effect also is unconspicuous, because fundamental voltage situation, focal length and the length of electron gun have pre-determined.
Space charge repulsion power is that a kind of spot diameter that produces owing to the repulsion and the collision of electronics in the electron beam amplifies phenomenon.In order to limit the amplification of the spot diameter Dst that produces owing to space charge repulsion power, preferably the progress angle with electron beam (claims " angle of flare " hereinafter; α) set up to increasing.
Aspect the spherical aberration characteristic of described main lens, the reason that spot diameter Dic is exaggerated is to cause owing to the electronics of the root axle that passes lens and the focus difference that passes between the electronics of its original axis.Opposite with space charge repulsion power, when the angle of flare of the electron beam that incides main lens reduced, the spot diameter that forms on phosphor screen diminished.
As introducing above, as the summary of three kinds of factors, the spot diameter Dt on the phosphor screen can be with following formulate:
What should be mentioned that especially is that existing people advises that a kind of method that the diameter of main lens is amplified reduces space charge repulsion power and spherical aberration.
Because the diameter of main lens has been exaggerated, if an electron beam incident that has big angle of flare comes, the amplification of the luminous point that is caused by spherical aberration will be limited, and space charge repulsion power weakens after passing the main lens body, thereby forms little luminous point on phosphor screen.
Curve representation among Fig. 2 be the result of the test that spot diameter changes along with the diameter variation of main lens.
Shown in the curve chart among Fig. 2, when the enlarged diameter of main lens, the amplification of the spot diameter that causes owing to spherical aberration is restricted, thereby has reduced the spot diameter on the phosphor screen.
Usually, receive high-tension the 5th electrode and receive variable voltage and be known as focusing electrode with synchronous the 6th electrode of deviation signal.The length of focusing electrode is to determine electron gun voltage ratio (%: principal element focusing/high voltage).Here, the 6th electrode is used to compensate the astigmatism that deflecting coil produces.When resolution that does not need to improve peripheral phosphor screen position and definition, the 6th electrode can.
Once the someone proposed some with the method that the main lens body amplifies, and for example with mechanical means the diameter that main lens forms the hole of electrode was left greatly, and with the method for the degree of depth that increases the electrostatic field control electrode lens was revised.
Because the diameter of neck has only 29.1 millimeters of φ, almost be impossible with mechanical means with the enlarged-diameter in the hole of electrode, thereby be difficult to improve the quality of focusing.
Therefore, in order to dwindle the spot diameter on the phosphor screen and to improve resolution, the chassis of controlling and driving cathode ray tube circuit suitably, make that the differential wave of the picture signal of carrying out electron beam scanning on phosphor screen is synchronous with the coil of the neck component of the cathode ray tube that has electron gun, and electron beam on a deflection speed by the balanced modulation of magnetic deflection field institute of deflecting coil.As a result, fluoroscopic resolution and definition improve.
Fig. 3 is the schematic diagram of the operation principle of expression speed modulation coil.
Method for optimization and improvement resolution on circuit, must make the total length of the electrode that receives fixed-focus voltage enough short, and the interval of making adequate preparation can be penetrated effectively so that make with the synchronous velocity modulation magnetic field that electric current produced of the picture signal of coil.
The structure of associated electrical rifle is not suitable for improving to greatest extent the usefulness of coil.
Generally speaking, the center in the magnetic field that produces by coil place the 5th electrode that receives relative high voltage near.The length of this electrode increases according to required voltage ratio in the design.
Compare with adjusting little element, the length that increases electrode can reduce producing cost, and can simplify production routine.
But, adopt the electron gun structure of long electrode can lower the usefulness of the velocity modulation that the magnetic field by coil produces simply, thereby limited the raising of resolution.
Summary of the invention
Therefore, target of the present invention provides an electron gun, it can improve the operation with the synchronous speed modulation coil of the differential wave of picture signal to greatest extent, its method is that at least one consecutive is placed two focusing electrodes that receive fixed-focus voltage in comprising the main electrode of an anode and a plurality of negative electrodes; And between the focusing electrode that receives fixed-focus voltage, keep proper spacing.
For reaching above-mentioned target, contain one in the cathode ray tube of the negative electrode of fluorescence emission electron beam at one, an electron gun has a positive electrode and in negative electrode one side a plurality of focusing electrodes is arranged in phosphor screen one side, speed modulation coil with a position of focusing electrode as magnetic field center, this coil is positioned in the neck of cathode ray tube and synchronous with the picture signal of circuit, this electron gun comprises at least two focusing electrodes that receive the main electrode of fixed-focus voltage, wherein, when the summation of the length of focusing electrode is the summation at interval of " L " and this electrode during for " g ", satisfy relational expression " (g * 100)/L=5～30 (%) ".
In one aspect of the invention, dwindle 15-30% in the horizontal direction, improved fluoroscopic resolution by at utmost making the phosphor screen spot diameter.
Description of drawings
From the detailed description of hereinafter being done in conjunction with the accompanying drawings, above-mentioned target of the present invention, characteristics and advantage will be distincter.These accompanying drawings are:
Fig. 1 is the schematic diagram of a conventional cathode ray tube;
Fig. 2 is a curve chart that spot diameter changes along with the variation of main lens diameter;
Fig. 3 is the fundamental diagram of speed modulation coil;
Fig. 4 a-Fig. 4 d is an associated electrical rifle and the structure chart according to electron gun of the present invention;
Fig. 5 a-Fig. 5 c represents be the focusing electrode that receives fixed-focus voltage and with the synchronous coil effect of the differential wave of picture signal under the curve chart that changes of spot diameter;
Fig. 6 a is the structure chart according to electron gun of the present invention; With
Fig. 6 b comprises an electron gun structure figure who is used to apply the electrode of variable focus voltage according to of the present invention.
Embodiment
In conjunction with the accompanying drawings a preferred embodiment of the present invention is elaborated now.In the following description, even in different figure, also use identical Ref. No. to represent same part.Some things of definition as the detailed structure and the element of a circuit, only to be in order helping the present invention comprehensively to be understood, and not to have other the meaning in this explanation.Therefore, obviously, do not have those definition things, can implement the present invention equally.And, do not elaborate at this for function that it is well known that and structure, because they can make the present invention very indeterminate on unnecessary details.
For the optimal speed modulation coil improves the method for resolution, being provided with magnetic field center that speed modulation coil produces and the length that receives the focusing electrode of a fixed-focus voltage therein must increase a high-tension ratio.In addition, the interval of electrode must be considered fully, so that can be penetrated effectively with the velocity modulation magnetic field that electric current produced of the picture signal synchronised of speed modulation coil.
Similar with the associated electrical rifle among Fig. 1, electron gun main lens structure of the present invention comprises a plurality of electrodes that the shared open assembly of three electron beams is arranged, tabular electrostatic field control electrode and the one group of hat multilayer electrode with three electron beam through-holes.Described one group of electrode links together electrically by soldering, is used to receive a high voltage and a variable voltage synchronous with defection signal.
Containing an anode and an a plurality of main electrode that is positioned at the focusing electrode of negative electrode one side that is arranged in phosphor screen one side, focusing electrode is divided into one again and applies the electrode of variable focus voltage and other the electrode that applies fixed-focus voltage.
Two focusing electrodes that apply fixed-focus voltage should be arranged at least.
Fig. 4 a and Fig. 4 b are the structure charts of associated electrical rifle; Fig. 4 c is the structure chart that will receive the electron gun that the focusing electrode 28 of fixed-focus voltage is in line according to the present invention.
Fig. 4 d is the structure chart of electron gun made in accordance with the present invention.In this electron gun, receive the focusing electrode 31 of variable focus voltage and the focusing electrode 28 of reception fixed-focus voltage and be in line.
In the electron gun shown in Fig. 4 c, be provided with the negative electrode 23 that receives picture signal; Collection is from negative electrode 23 electrons emitted and can make fluoroscopic second electrode 25 of electronics directive; And when with apply first electrode 24 that is used to prevent the electronics emission when electron beam is not transmitted for the picture signal correspondent voltage of negative electrode.In addition, also be provided with and be used to apply more high-tension third electrode 26; Be used to apply the 4th electrode 27 than low voltage; And be used to apply focusing electrode 28a, 28b and 28c than higher fixed voltage.
Utilize a main lens that receives 29 formation of high-tension the 9th electrode to the fluorescent scanning electron beam.
Compare with the electron gun among Fig. 4 c, the electron gun among Fig. 4 d and then also comprise the 8th electrode 31 that is used to form with the synchronous quadruple lens of the defection signal of deflecting coil is used to apply the astigmatism that variable focus voltage and compensation are produced by deflecting coil magnetic field.
By the 8th electrode 31 with receive main lens that high-tension the 9th electrode 29 forms, thereby form the phosphor screen of cathode ray tube to the fluorescent scanning electron beam.
Fig. 6 is the structure chart that comprises the electron gun of a focusing electrode that is used to apply fixed-focus voltage according to of the present invention.
Wherein main electrode comprises anode electrode 29 and focusing electrode 28.Focusing electrode 28 by the electrode 31 that is used to apply variable focus voltage and the electrode 28 that is used to apply fixed-focus voltage form.
The same with focusing electrode 28a, 28b and 28c among Fig. 4 c and Fig. 4 d, have at least two focusing electrodes 28 that are used to apply fixed-focus voltage to be in line.The scope of the length sum (L) of focusing electrode 28 is from 4 millimeters to 30 millimeters.
Here, when interval g1 and the g2 sum of supposing focusing electrode 28 are " g ", then should satisfy: " (g * 100)/L=5～30 (%) ".
The result of the test that is used for the focusing electrode 28 that receives fixed-focus voltage and satisfy aforesaid equation is seen the curve chart of Fig. 5 a to Fig. 5 c.
Show among Fig. 5 a to Fig. 5 c be the focusing electrode that receives fixed-focus voltage and with the effect of the synchronous coil of the differential wave of picture signal under the situation of change of spot diameter.
Graphical representation among Fig. 5 a be the number at the interval of electron gun electrodes, particularly be placed in the coil working magnetic field center and receive the number at interval of the focusing electrode of fixed-focus voltage, the number at the interval of the 5th electrode 28a, the 6th electrode 28b and the 7th electrode 28c among Fig. 4 just, and the numerical value that the phosphor screen luminous point is dwindled owing to the velocity modulation magnetic field of coil.It is many more that number at interval increases, and obtained effect is just good more.
Curve representation among Fig. 5 b be the length at interval of focusing electrode 28 and the numerical value that the phosphor screen luminous point is dwindled owing to the velocity modulation magnetic field of coil.When the scope of the length at described interval was from 0.6 to 1.2 millimeter, the task performance of coil reached maximum.
Graphical representation among Fig. 5 c be the relation in the velocity modulation magnetic field of the total length of electron gun and coil.The electron gun that is inserted in the cathode ray tube has a ratio cycle.
According to the data of Fig. 5 a to Fig. 5 c, the number at the interval of focusing electrode 28 is one at least, and length at interval is preferably in 0.6 to 1.2 millimeter scope.Though the long electron gun of total length is favourable, surpasses a specific level, it can not have effect yet.
When making under these conditions and measuring, the size of luminous point in the horizontal direction can reduced about 15% to 30% on the phosphor screen.
According to the present invention, in order to dwindle the spot diameter that focusing is had appreciable impact, the whole length that receives the focusing electrode of fixed-focus voltage is remained unchanged, focusing electrode is divided at least two electrodes that add identical voltage, and the interval that makes focusing electrode is in 0.6 to 1.2 millimeter scope, thereby makes the diameter of luminous point on the phosphor screen dwindle 15% to 30% in the horizontal direction.
And, provide this electron gun only to need seldom expense and very short cycle, can improve focusing quality in advance.
Though the present invention has been done to show and explanation in conjunction with certain preferred embodiments of the present invention, but the brainstrust of being familiar with this technology should be appreciated that, in not violating the appended claim of presents under the prerequisite of defined scope and spirit of the present invention, the change of various forms and details aspect may appear.
Claims (4)
1. cathode ray tube, this cathode ray tube contains a negative electrode to fluorescence emission electron beam; One has a positive electrode and the electron gun of a plurality of focusing electrodes is arranged in negative electrode one side in phosphor screen one side; One with a position of the focusing electrode speed modulation coil as magnetic field center, and this coil is positioned in the neck of cathode ray tube and synchronous with the picture signal of circuit; This electron gun comprises at least two focusing electrodes that receive the main electrode of fixed-focus voltages, wherein, and when the summation of the length of focusing electrode be the summation at interval of " L " and this electrode during for " g ", satisfied " (g * 100)/L=5～30 (%) ".
2. method as claimed in claim 1 is characterized in that, " L " satisfies following condition:
" 4 millimeters＜L＜30 millimeters ".
3. method as claimed in claim 1 is characterized in that, " g " satisfies following condition:
" 0.6 millimeter＜g＜1.2 millimeters ".
4. method as claimed in claim 1 is characterized in that, the number of described focusing electrode is three.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR20010056933 | 2001-09-14 | ||
| KR10-2001-0056933A KR100426569B1 (en) | 2001-09-14 | 2001-09-14 | Electron gun for CRT |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1405830A true CN1405830A (en) | 2003-03-26 |
| CN1206695C CN1206695C (en) | 2005-06-15 |
Family
ID=19714302
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021278946A Expired - Fee Related CN1206695C (en) | 2001-09-14 | 2002-08-15 | Electdronic gun of colour cathode-ray tube |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1294009A3 (en) |
| JP (2) | JP2003092071A (en) |
| KR (1) | KR100426569B1 (en) |
| CN (1) | CN1206695C (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07111879B2 (en) * | 1986-02-14 | 1995-11-29 | 株式会社東芝 | Color picture tube device |
| US6031326A (en) * | 1997-04-01 | 2000-02-29 | Hitachi, Ltd. | Electron gun with electrode supports |
| DE69724942D1 (en) * | 1997-07-04 | 2003-10-23 | Thomson Tubes & Displays | Color picture tube with an in-line electron gun |
| JPH11135031A (en) * | 1997-10-30 | 1999-05-21 | Hitachi Ltd | Color cathode-ray tube |
| KR100339349B1 (en) * | 1999-08-07 | 2002-06-03 | 구자홍 | electron gun in color cathode ray tube |
| KR100728190B1 (en) * | 2001-01-17 | 2007-06-13 | 삼성에스디아이 주식회사 | Electron gun for cathode ray tube |
| KR100778497B1 (en) * | 2001-05-15 | 2007-11-22 | 삼성에스디아이 주식회사 | Electron gun for cathode ray tube |
-
2001
- 2001-09-14 KR KR10-2001-0056933A patent/KR100426569B1/en not_active IP Right Cessation
-
2002
- 2002-06-21 JP JP2002181524A patent/JP2003092071A/en not_active Withdrawn
- 2002-07-01 EP EP02254610A patent/EP1294009A3/en not_active Withdrawn
- 2002-08-15 CN CNB021278946A patent/CN1206695C/en not_active Expired - Fee Related
-
2004
- 2004-12-22 JP JP2004371963A patent/JP2005129544A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JP2003092071A (en) | 2003-03-28 |
| EP1294009A3 (en) | 2004-05-06 |
| KR100426569B1 (en) | 2004-04-08 |
| CN1206695C (en) | 2005-06-15 |
| KR20030023826A (en) | 2003-03-20 |
| JP2005129544A (en) | 2005-05-19 |
| EP1294009A2 (en) | 2003-03-19 |
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Owner name: ME LE DI AN GUANG SHI (SOUTH KOREA) CO., LTD. Free format text: FORMER OWNER: LG PHILIPS DISPLAYS (KOREA) CO., LTD. Effective date: 20090904 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20090904 Address after: Seoul, South Kerean Patentee after: Miller lighting (Korea) Co., Ltd. Address before: Gyeongbuk, South Korea Patentee before: LG Philip Display (Korea) Co., Ltd. |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050615 Termination date: 20110815 |