CN1090945A - Focusing electrode of the electron gun of color Braun tube and preparation method thereof - Google Patents
Focusing electrode of the electron gun of color Braun tube and preparation method thereof Download PDFInfo
- Publication number
- CN1090945A CN1090945A CN93120862A CN93120862A CN1090945A CN 1090945 A CN1090945 A CN 1090945A CN 93120862 A CN93120862 A CN 93120862A CN 93120862 A CN93120862 A CN 93120862A CN 1090945 A CN1090945 A CN 1090945A
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- China
- Prior art keywords
- plunging
- axial length
- focusing electrode
- electrode
- electron gun
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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
- H01J29/51—Arrangements for controlling convergence of a plurality of beams by means of electric field only
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- Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
- Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
- Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
- Electrodes For Cathode-Ray Tubes (AREA)
Abstract
A kind of electron gun focus electrode of color Braun tube comprises a plurality of plunging parts, and they inwardly stretch vertically and be defined for each opening by electron beam from the electrode end wall.The curved shape that free end had of each plunging part makes its axial length change, and the longest and minor axis length is replaced with 90 ° regular angular spacing.The invention still further relates to the manufacture method of this focusing electrode.Focusing electrode of the present invention and preparation method thereof has been realized the required circularity of bundle point in the edge of screen, and is not realizing required resolution under the situation that increases traditional panel between the plunging part.
Description
The present invention relates to the electron gun of colored Braun (Braun) pipe generally speaking, and more particularly relate to the electron gun focus electrode that is used for the electron beam total focus of the cathode emission of rifle is gone out at the phosphor screen of Braun pipe, and relate to the manufacture method of this focusing electrode.
To known to those skilled in the art be, the electron gun of traditional colored Braun pipe is focused on the phosphor screen by element from its cathode emission electron beam and this bundle, to form the point type pixel on phosphor screen.
In the conditional electronic rifle, when three negative electrodes and gate electrode are coupled with predetermined voltage, between second gate electrode and third electrode or focusing electrode, have formed prefocus lens, and between third electrode and one the 4th electrode or anode, formed main focusing lens.Focused on the phosphor screen by these condenser lenses from gun cathode electrons emitted bundle.On screen, the electron beam of focusing is gone up coated fluorescence with screen and is bumped against, thus on screen picture reproducing.
Aspect in addition, deflecting coil is installed in the neck of the funnel of Braun pipe, and this neck comprises electron gun.Deflecting coil is used for the electron beam deflecting and focuses on phosphor screen.
The announcement of the horizontal deflection magnetic field that deflecting coil produces is distorted into pillow, and the distribution of vertical deflection magnetic field is distorted into tubbiness.
Above-mentioned deflecting coil when the fluorescence on the electron gun electrons emitted Shu Yuping bumps against and reproduce required figure on screen, causes the central authorities that are formed on screen and the shape of the bundle point on the edge to differ from one another.
Referring to Fig. 2, the bundle point that forms in the central authorities of shielding 1 is circular, and the bundle point distortion that forms at the edge of screen 1 is non-circular, has produced commatic aberration because the deflecting action of deflecting coil makes at the edge of screen 1.Therefore the resolution of screen (especially on the limit of screen) has been lowered.
The resolution at platen edge place descends, be because the aspect ratio of bundle point-perpendicular diameter of the non-circular bundle point that promptly distorted is definite with the ratio one of horizontal diameter.In other words, the aspect ratio ∧ of bundle point is by D
v: D
hOr D
v/ D
hExpression, wherein D
vBe the perpendicular diameter or the shortest diameter of bundle point, D
hBe the horizontal diameter or the longest diameter of bundle point.At this moment, the aspect ratio of bundle point is inversely proportional to the noncircularity of the bundle point of distortion, and the direct ratio that is declined to become of the decline of resolution and an aspect ratio of restrainting.
On the contrary, when the aspect ratio of bundle point is 1, shows that the bundle point presents desirable circle, thereby realized best resolution.
Fig. 1 is the cutaway view that traditional being used to improves the electron gun focus electrode of bundle point aspect ratio and resolution.As shown in this figure, form at the anode with electron gun on the focusing electrode 4 of main focusing lens, plunging (burring) part 6 is provided, this plunging part 6 defines corresponding opening 5.Above-mentioned focusing electrode is attempted by plunging part 6, improves the resolution when in length and breadth of bundle point.
Yet, represented as the curve chart of Fig. 3, can see that this traditional focus electrode only is not less than at 50% o'clock at the ratio of the length L of plunging part 6 and the diameter D of opening 5, just can realize desirable bundle point circularity.
Above-mentioned have the focusing electrode of plunging part 6 in fact to be applicable to middle subtype electron gun.But this focusing electrode fails to reach desirable bundle point aspect ratio at the edge of screen, though it has realized required bundle point aspect ratio to a certain extent in the central authorities of screen.
Recently, because the curvature of Braun tube has the trend of increase, the resolution of Braun tube has descended, and screen becomes flat, and the aspect ratio of the screen of Braun tube became about 9: 16 from about 3: 4.The catercorner length of Braun tube screen thereby increase, the result, the commatic aberration of the edge of screen increases, thus the resolution of Braun tube descends.
Problem for the above-mentioned trend that overcomes because of Braun tube causes has proposed a kind of electron gun, is used to increase near the perpendicular diameter of the bundle point the central authorities of screen, and makes the bundle point of the edge of screen reach required ground circularity, as shown in Figure 4.This electron gun comprises three negative electrodes 7 launching R, G and B electron beam respectively and first and second gate electrodes 9 and 10 that have some through holes 8 in the position for these negative electrodes 7.This electron gun also comprises third electrode or focusing electrode 11 and the 4th electrode or anode 12. Element 7,9,10,11 and 12 is according to the order setting to screen, so that they separate each other and are parallel to each other.
Here, in order to produce longitudinal electric field at electromagnetic lens or main focusing lens place, the space between the plunging part 13 of third electrode 11 is provided with 1/4th plates 14, and this electrode has constituted main focusing lens with the 4th electrode 12.
According to the above-mentioned electron gun of Fig. 4, be used to restraint vertical focusing power F a little
vWith respect to horizontal focusing power F
hIncreased, thereby the bundle point 3 that shields 1 centre presents non-circularly, promptly perpendicular diameter is greater than horizontal diameter, as shown in Figure 5.Yet each bundle point 2 of screen 1 edge presents desirable circle, thereby has realized the desirable circularity of bundle point at the edge of screen, and has improved and shield 1 the resolution edge of screen 1 (particularly).
Yet, owing in the space of above-mentioned electron gun between the plunging part 13 of third electrode or focusing electrode 11 among Fig. 4 1/4th additional plates 14 to be arranged, thus the making difficulty of electron gun, and be difficult to the making precision that realizes that it is required.Be that condenser lens 11 has special restriction, thereby be difficult to 1/4th plates 14 are adorned in the space between the plunging part 13 of big focusing electrode 11.For 1/4th plates 14 are contained on the focusing electrode 11,1/4th plates 14 will be soldered on the electrode 11 with dot welding method, thereby the power that is added thereon when making plunging part 13 because of the spot welding of 1/4th plates 14 loses its slyness.Therefore, possibly can't realize that the opening of focusing electrode 11 and the required of through hole 8 of first and second electrodes 9 and 10 axially align accurately.
Thereby, one object of the present invention, provide the focusing electrode of the electron gun of color Braun tube, wherein can overcome the problems referred to above that the traditional focus electrode causes, and realized required bundle point circularity, and under the situation that or not does not increase by 1/4th traditional plates between plunging part, realized required resolution focusing electrode at Braun tube screen edge place.The present invention also provides the method for making above-mentioned focusing electrode.
In one aspect, the invention provides a kind of focusing electrode of color Braun tube electron gun, this pipe comprises from the end wall of electrode and inwardly stretches vertically and be defined for a plurality of plunging parts by each opening of each electron beam, the inboard free end of each plunging part has crooked shape, the axial length of plunging part is changed, thus make the longest and minor axis to length with 90 ° of angular spacings of rule and for variation.
On the other hand, the invention provides the method for the focusing electrode of making the color Braun tube electron gun, may further comprise the steps: make the raw sheet plunging of focusing electrode earlier, on the bottom of the pressure part of plate, to form circular hole; The limit of processing circular hole is to be formed with the non-circular hole of main shaft and secondary axes; Non-circular hole is carried out last plunging providing crooked interior free-ended plunging part, the axial length of plunging part change so that the longest and minor axis to the regular angular spacing alternate of length with 90 °.
From detailed description, can more be expressly understood other purposes of the present invention, feature and advantage below in conjunction with accompanying drawing.In the accompanying drawings:
Fig. 1 is the traditional focus electrode of the electron gun of color Braun tube;
Fig. 2 has shown the shape of the bundle point that the traditional focus electrode of usefulness Fig. 1 forms at the central authorities and the edge of screen;
Fig. 3 is curve chart, and the aspect ratio that has shown the bundle point is with respect to the relation of the percent value of the diameter of the opening of the length of the focusing electrode plunging part of Fig. 1 and focusing electrode;
Fig. 4 is a schematic sectional view, has shown the arrangements of elements that has according to the electron gun of the traditional focus electrode of another embodiment that is used to improve resolution;
Fig. 5 has shown the shape of the traditional focus electrode of Fig. 4 at the bundle point of the central authorities of shielding and edge's formation;
Fig. 6 a is the front view of focusing electrode according to an embodiment of the invention;
Fig. 6 b is the cutaway view of the focusing electrode of Fig. 6 a;
Fig. 6 c is the plunging enlarged perspective partly of the focusing electrode of Fig. 6 b; The net shape that has shown the plunging part;
Fig. 7 a has shown the step of making according to the method for focusing electrode of the present invention respectively to 7c, wherein:
Fig. 7 a has shown the first plunging step, is used for forming circular hole as on the upper plate of focusing electrode raw sheet;
Fig. 7 b is that non-circular hole forms step;
Fig. 7 c is last plunging or completing steps;
Fig. 8 a and 8b are respectively the cutaway views of focusing electrode according to another embodiment of the present invention;
Fig. 9 a to 9c is a schematic diagram, has shown the shape of the non-circular hole that forms on the upper plate in above-mentioned non-circular hole formation step according to the present invention.
Participate in Fig. 6 a to 6c, wherein shown focusing electrode according to the color Braun tube electron gun of the first embodiment of the present invention.As shown in these figures, focusing electrode 15 comprises three opening 15a that separate out by regular spaces, from R, the G of each cathode emission of electron gun and B electron beam respectively by these openings.
The cut-away view that the X-axis along Fig. 6 a of Fig. 6 b focusing electrode 15 is got.Shown in Fig. 6 b, three opening 15a are limited by each plunging part 16 that the end surfaces from focusing electrode 15 extends internally.The inner of each plunging part 16 or free end are depressed smoothly, thereby present crooked shape during from cutaway view.
In the saturating figure of Fig. 6 c, shown the curved end shape of each plunging part 16 of electrode 15 in detail.When the plunging part 16 that limits opening 15a vertically with 90 ° of angles of rule by four minutes so that part 16 at the peak of its crooked medial extremity with locate by (shown in Fig. 6 c) separately the time vertically, the axial length of the plunging part 16 at disconnected position place differs from one another.Promptly at the axial length l of the plunging part 16 of 90 ° and 270 ° angles
2Than axial length l 180 ° and the 360 ° plunging parts of locating 16
1Short.
By the curved end shape of the plunging part 16 of focusing electrode 15, electrode 15 makes the bundle point of screen center present non-circular shape, and promptly perpendicular diameter is longer than horizontal diameter as illustrated in fig. 5, makes the bundle point at screen edge place reach required circularity simultaneously.Thereby, realized required resolution.
The invention still further relates to a kind of electrode, the structure of plunging part 16 wherein makes its axial length l in the position, angle of 90 ° and 270 °
2Be longer than its axial length l in the position, angle of 180 ° and 360 °
1, under the situation that does not influence effect of the present invention, can realize same effect.
The axial length l of plunging part 16
1And l
2Between above-mentioned poor, make that among vertical focusing power Fv that each electron beam is suffered and the horizontal focusing power Fh is bigger than another when the electron beam from the cathode emission of electron gun passes each opening 15a that the plunging part 16 of focusing electrode 15 limited.Therefore, focusing electrode 15 makes the bundle point of central authorities present the shape of non-circle and has realized the required circularity of peripheral bundle point.
Referring to Fig. 8 a and 8b, wherein shown respectively according to of the present invention second with focusing electrode the 3rd embodiment, that different plunging partial shapes is arranged.In second embodiment of Fig. 8 a, the axial length l of central plunging part 16
2Axial length l than central plunging part 16
1Short, and the axial length l of each the plunging part 16 on the limit
2Be longer than the axial length l of the plunging part 16 on the limit
1On the contrary, in the 3rd embodiment of Fig. 8 b, the axial length l of central plunging part 16
2Be longer than the axial length l of central plunging part 16
1, and the axial length l of each the plunging part 16 on the limit
2Be shorter than the axial length l of the plunging part 16 on the limit
1According to the second and the 3rd embodiment, under the situation that does not influence function of the present invention, can realize and the same effect described in first embodiment.
Fig. 7 a to 7c has shown the step of the method for making focusing electrode of the present invention.As shown in these figures, for making focusing electrode of the present invention, the upper plate 17 as raw sheet of electrode 15 has experienced the first plunging step, so that form circular hole 18 on the lower curtate of the pressure part of plate 17, shown in Fig. 7 a.Then, plate 17 experience one non-circular hole forms step, by machine work or by the edge with stamping machine (not shown) punching press circular hole 18, forms non-circular hole, if any the elliptical aperture 19 of main shaft and secondary axes, shown in Figure 76.Form in step at this non-circular hole, the direction of the long diameter of elliptical aperture 19 has determined the axial length l of the plunging part 16 that produced
1And l
2Poor.
If elliptical aperture 19 is stamped, make its perpendicular diameter be longer than its horizontal diameter (shown in Fig. 7 b), the axial length l of the plunging part 16 that is then produced
1Be longer than axial length l
2, shown in Fig. 6 b.On the contrary, when the stamping machine that is used to form elliptical aperture 19 turns over 90 °, and punching hole 19 is so that the perpendicular diameter in hole 19 when being shorter than its horizontal diameter, the axial length l of the plunging part 16 that is produced
1Be shorter than axial length l
2
According to the present invention, in non-circular hole forms step, be preferably on the bottom of pre-plunging part of plate 17 and form elliptical aperture 19, shown in Fig. 7 b and 9a.But also available oval pore 19a or polygonal hole 19b shown in Fig. 9 b and 9c replaces elliptical aperture 19.In the case, should understand, when punching press oval pore 19a on plate 17 or polygonal hole 19b, in continuous step, promptly in last flange step or completing steps, on the free end of plunging part 16, uneven pressure can be produced, thereby on the free end of the plunging part 16 that is produced, the crack can be produced.
After non-circular hole formation step was finished, the last plunging step of plate 17 experience was to form the plunging part 16 that is produced, shown in Fig. 7 c.The result of last plunging step is the elliptical shape owing to the hole 19 of Fig. 7 b, makes the axial length l of the plunging part 16 that is produced
1Be longer than axial length l
2
When electron beam passed each opening 15a that the plunging part 16 of focusing electrode 15 limited, the vertical focusing power Fv of bundle was less than horizontal focusing power Fh, thereby improved the aspect ratio of bundle point and improved resolution.
As mentioned above, according to the present invention, not be used between the plunging part of focusing electrode additional panel is set, thereby significantly reduced the step of the manufacturing process of focusing electrode, this has improved the output of focusing electrode.In addition, focusing electrode of the present invention has reached required plunging slick and sly degree partly, thereby reliable electron gun is provided.
Though announced most preferred embodiment of the present invention for illustrative purposes, those skilled in the art will understand, under the prerequisite that does not break away from the scope and spirit of announcing as appended claims of the present invention, can carry out multiple modification, increase and replacement.
Claims (6)
1, a kind of focusing electrode of electron gun of color Braun tube comprises:
A plurality of plunging parts, they inwardly stretch vertically and are defined for each opening that each electron beam passes from the end wall of described electrode, each described plunging is the curved shape that inboard free end had of each partly, the axial length of described plunging part is changed, thereby the long and minor axis length of major axis is alternately occurred with 90 ° of angle intervals of rule.
2, focusing electrode according to claim 1, wherein each described plunging part is longer than described plunging partly in the axial length of 180 ° and position, 360 ° of angles in the axial length of 90 ° and position, 270 ° of angles.
3, condenser lens according to claim 1, the axial length of a central plunging part of wherein said all inside rim part in the position, angle of 90 ° and 270 ° is shorter than the axial length of described central plunging part 180 ° and position, 360 ° of angles, and the plunging on each next door partly is longer than the plunging axial length partly on described next door in the axial length of the position, angle of 90 ° and 270 °.
4, focusing electrode according to claim 1, the central plunging part of wherein said plunging part is longer than the axial length of described central plunging part 180 ° and position, 360 ° of angles 90 ° and 270 ° of axial length of locating, and each next door plunging partly the axial length 90 ° and position, 270 ° of angles be shorter than the plunging axial length partly on described next door.
5, be used to make the method for focusing electrode of the electron gun of color Braun tube, may further comprise the steps:
At first the raw sheet of described focusing electrode is carried out inside rim to form circular hole on the bottom of the pressure part of described plate;
The edge that processes described circular hole is to be formed with the non-circular hole of main shaft and secondary axes;
Described non-circular hole is carried out last plunging have crooked inboard free-ended plunging part to provide, the axial length of described plunging changes makes 90 ° the angular spacing alternately appearance of the longest and minor axis length with rule.
6, the method for claim 5, wherein said non-circular hole are in elliptical aperture, oval pore and the polygonal hole.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR23512/1992 | 1992-12-07 | ||
| KR1019920023512A KR950004400B1 (en) | 1992-12-07 | 1992-12-07 | Focusing electrode for electron gun and manufacturing method for the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1090945A true CN1090945A (en) | 1994-08-17 |
| CN1043937C CN1043937C (en) | 1999-06-30 |
Family
ID=19344883
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN93120862A Expired - Fee Related CN1043937C (en) | 1992-12-07 | 1993-12-07 | Focusing electrode of electron gun of color Braun tube and preparation method thereof |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH06236738A (en) |
| KR (1) | KR950004400B1 (en) |
| CN (1) | CN1043937C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4120177B2 (en) | 2001-04-06 | 2008-07-16 | 松下電器産業株式会社 | Color picture tube |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5763750A (en) * | 1980-10-03 | 1982-04-17 | Hitachi Ltd | Control picture tube electron gun |
| KR910004753B1 (en) * | 1989-01-20 | 1991-07-10 | 삼성전관 주식회사 | Manufacturing methode for electrode of crt |
-
1992
- 1992-12-07 KR KR1019920023512A patent/KR950004400B1/en not_active IP Right Cessation
-
1993
- 1993-12-02 JP JP5302580A patent/JPH06236738A/en active Pending
- 1993-12-07 CN CN93120862A patent/CN1043937C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| KR950004400B1 (en) | 1995-04-28 |
| CN1043937C (en) | 1999-06-30 |
| JPH06236738A (en) | 1994-08-23 |
| KR940016418A (en) | 1994-07-23 |
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| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: LG PHILIPS MONITORS KOREA CO., LTD. Free format text: FORMER OWNER: GOLDSTAR CO., LTD. Effective date: 20081031 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20081031 Address after: Gyeongbuk, South Korea Patentee after: LG Philips Displays Korea Address before: Seoul Patentee before: Goldstar Co., Ltd. |
|
| ASS | Succession or assignment of patent right |
Owner name: ME LE DI AN GUANG SHI (SOUTH KOREA) CO., LTD. Free format text: FORMER OWNER: LG PHILIPS MONITORS KOREA CO., LTD. Effective date: 20090828 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20090828 Address after: Seoul, South Kerean Patentee after: LG Philips Displays Korea Address before: Gyeongbuk, South Korea Patentee before: LG Philips Displays Korea |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 19990630 Termination date: 20111207 |