GB2274020A - Electron gun for colour cathode ray tube - Google Patents
Electron gun for colour cathode ray tube Download PDFInfo
- Publication number
- GB2274020A GB2274020A GB9326593A GB9326593A GB2274020A GB 2274020 A GB2274020 A GB 2274020A GB 9326593 A GB9326593 A GB 9326593A GB 9326593 A GB9326593 A GB 9326593A GB 2274020 A GB2274020 A GB 2274020A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electrode
- electron beam
- focus electrode
- ray tube
- cathode ray
- 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.)
- Withdrawn
Links
- 238000010894 electron beam technology Methods 0.000 claims description 84
- 238000005452 bending Methods 0.000 claims 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 21
- 201000009310 astigmatism Diseases 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000001360 synchronised effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000005684 electric field Effects 0.000 description 3
- 125000001475 halogen functional group Chemical group 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 241000226585 Antennaria plantaginifolia Species 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
Classifications
-
- 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
- H01J29/48—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
- H01J29/56—Arrangements for controlling cross-section of ray or beam; Arrangements for correcting aberration of beam, e.g. due to lenses
- H01J29/566—Arrangements for controlling cross-section of ray or beam; Arrangements for correcting aberration of beam, e.g. due to lenses for correcting aberration
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2229/00—Details of cathode ray tubes or electron beam tubes
- H01J2229/48—Electron guns
- H01J2229/4834—Electrical arrangements coupled to electrodes, e.g. potentials
- H01J2229/4837—Electrical arrangements coupled to electrodes, e.g. potentials characterised by the potentials applied
- H01J2229/4841—Dynamic potentials
Landscapes
- Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
- Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
Description
2274020 ELECTRON GUN FOR COLOR CATHODE RAY TUBE The present invention
relates to an electron gun for a color cathode ray tube which is mounted in the neck of the cathode ray tube so as to emit an electron beam, and more particularly, to an electron gun for a color cathode ray tube in which the astigmatism and focus problems due to a deflection yoke for deflecting the electron beam are corrected so as to form electron beam spots uniformly throughout a phosphor screen.
Generally, the resolution of a color cathode ray tube depends upon the diameter and shape of electron beam spots landing on the entire phosphor screen. In order to obtain a high-resolution picture, it is important that the electron beam spots landing on the phosphor screen should be formed as small as possible, should be distorted as little as possible, and should have no halo. In a general color cathode ray tube, however, since electron guns emitting three electron beams are disposed in line, and a self- convergence is method is carried out by employing a deflection yoke whose horizontal deflection magnetic field is a pincushion magnetic field and whose vertical deflection magnetic field is a barrel magnetic field, as shown in Fig. 1 of the accompanying drawings, spots 101 of the electron beam landing on the periphery of a phosphor screen 100 have a high-luminance core portion 102 and a low-luminance haze portion 103, due to the nonuniform magnetic field
2 of the deflection yoke. The nonuniform shape of electron beam spots 101 does not allow the formation of a good-quality picture, due to the spherical aberration and astigmatism of the electron gun and the difference between the vertical and horizontal focal lengths of the electron beam.
Fig.2 of the accompanying drawings shows one example of a conventional electron gun for a color cathode ray tube which is designed to resolve such a problem.
Referring to Fig.2, a cathode 2, a control electrode 3 and a screen electrode 4 which constitute a triode, a focus electrode 5, a dynamic focus electrode 6 and a final accelerating electrode 7 which form an auxiliary lens and a major lens, are sequentially arranged in the conventional electron gun for a color cathode ray tube. Vertically elongate electron beam passing holes SH and horizontally elongate electron beam passing holes 6H are formed on opposing surfaces of focus electrode 5 and dynamic focus electrode 6, respectively. A focus voltage W and an anode voltage Va are applied to focus electrode 5 and final accelerating electrode 7, respectively. A dynamic focus voltage Wd, which takes the focus voltage as a reference voltage and is synchronous with a deflection signal, is applied to dynamic focus electrode 6.
In the construction of the conventional electron gun 1 of a color cathode ray tube, when an electron beam is projected onto the center of the phosphor screen, since the same voltage as the focus voltage W is applied to dynamic focus electrode 6, a quadrupole lens is not formed between focus 3 electrode 5 and dynamic focus electrode 6. The electron beam emitted from cathode 2 is converged and accelerated by the major lens formed between dynamic focus electrode 6 and final accelerating electrode 7 so that the beam forms a circular electron beam spot when landing on the center of the phosphor screen. When the electron beam emitted from cathode 2 is projected onto the periphery of the phosphor screen, since dynamic focus voltage Vfd which is synchronous with the deflection signal and takes focus voltage W as its reference, is applied to dynamic focus electrode 6, a quadrupole lens is formed between focus electrode 5 and focus electrode 6 by vertically elongate electron beam passing holes SH and horizontally elongate electron beam passing holes 6H which are formed on opposing electrode surfaces. Passing the quadrupole lens, the electron beam emitted from cathode 2 receives a strong converging force horizontally and a strong diverging force vertically, so as to form a vertically elongated cross section of the electron beam. When the vertically elongated electron beam is deflected toward the periphery of the phosphor screen, beam distortion due to the nonuniform magnetic field of the deflection yoke is compensated. This allows the spot of the electron beam landing on the periphery of the phosphor screen to be circular.
In the conventional electron gun 1 for a color cathode ray tube, however, since the vertically elongate electron beam passing holes SH and horizontally elongate electron beam passing holes 6H are formed in the outgoing plane of focus electrode 5 and in the incoming plane of dynamic 4 focus electrode 6, respectively, it is difficult of achieve a precise crossing of the vertical holes SH and the horizontal holes 6H.
Especially, since focus electrode 5 and dynamic focus electrode 6, which form a quadrupole lens, are spaced apart by a predetermined distance, the quadrupole lens is distorted due to the electrical field permeating the neck.
In order to resolve such problems, a method has been proposed in which a plurality of rectangular electrodes having a plate-shaped extension is provided on a plane opposing a converging electrode and a constant beam converging voltage is applied to at least one of the rectangular electrodes.
Here, a dynamic voltage which takes the beam-converging voltage as a reference and varies according to beam deflection, is applied to other rectangular electrodes. This method solves the astigmatism of the electron beam, but cannot solve the quadrupole-lens; distortion problem caused due to the permeating electrical field. Further, since the rectangular electrodes are is placed on the plane opposing the converging electrode, the electron gun is undesirably lengthened.
Therefore, it is an object of the present invention to provide an electron gun for a color cathode ray tube which compensates for the astigmatism and focusing problems of an electron beam which are caused due to the nonunifonn magnetic field of the deflection yoke, so as to obtain a uniform electron beam spot without halo throughout the phosphor screen.
According to the present invention there is provided an electron gun for a color cathode ray tube comprising three cathodes disposed in line, a focus electrode, a dynamic focus electrode and a final accelerating electrode which are sequentially disposed along the axis of the electron gun, wherein vertical blades extended to the cathodes by a predetermined length are provided between electron beam passing holes formed on the outgoing plane of the focus electrode, a plurality of slots are formed laterally on the top and bottom of the electron beam passing holes, horizontal blades inserted into the slots are provided on the top and bottom of electron beam passing holes formed on the incoming plane of the dynamic focus electrode, a predetermined focus voltage is applied to the focus electrode, and a dynamic focus voltage, which is variably greater than the focus voltage according to the deflection of the electron beam, is applied to the dynamic focus electrode.
Embodiments of the present invention will now be described by way of example with reference to the accompanying drawings in which:
Fig. 1 visualizes electron beam spots formed when the electron beams emitted from a conventional electron gun land on the phosphor screen of a cathode ray tube; Fig.2 is a partially cutaway perspective view of the conventional color cathode ray tube, which shows a voltage applying method; Fig.3 is a partially cutaway perspective view of a color cathode ray tube illustrating an embodiment of the present invention, which shows a voltage applying method; 6 Figs.4-7 are partially cutaway perspective views of the focus electrode andlor dynamic focus electrode of the electron gun for a color cathode ray tube, according to various embodiments of the present invention; Fig.8 is a cross-sectional view of a state in which horizontal blades of the dynamic focus electrode of Fig.7 are inserted into slots of the focus electrode of Fig.7; and Fig.9 visualizes the influencing effects on an electron beam, obtained by a quadrupole lens formed by vertical blades of the focus electrode and horizontal blades of the dynamic focus electrode, according to the embodiment of FIG.3.
The electron gun for a color cathode ray tube of the present invention is to emit thermions while mounted in the neck of the cathode ray tube, one embodiment of which is shown in Fig.3.
As illustrated in Fig.3, in the electron gun for a color cathode ray tube, is a cathode 12, a control electrode 13 and a screen electrode 14 which constitute a triode, a focus electrode 15, a dynamic focus electrode 16 and a final accelerating electrode 17 which form an auxiliary lens and a major lens, are sequentially disposed along the axis of the electron gun.
As a characteristic feature of the present invention, vertical blades 200 which extend toward cathode 12 for a predetermined length are installed on either side of each of three electron beam passing holes 15R, 15G and 15B formed on the outgoing plane of focus electrode 15. Slots 301 are horizontally 7 formed on the tops and bottoms of electron beam passing holes 15R, 15G and 15B formed in the outgoing plane of focus electrode 15.
Horizontal blades 300, to be inserted into slots 301 formed in the outgoing plane of focus electrode 15, are provided on the tops and bottoms of three electron beam passing holes 16R, 16G and 16B formed in the incoming plane of dynamic focus electrode 16 which opposes the outgoing plane of focus electrode 15. To prevent horizontal blades 300 from coming into contact with the outgoing plane of focus electrode 15 after insertion into slots 301, the width W and height h of slots 301 should be sufficiently greater than the width W' and thickness t of horizontal blades 300.
Fig.4 shows another embodiment of the vertical blades formed on the inner surface of the outgoing plane of focus electrode 15 and the horizontal blades formed on the incoming plane of dynamic focus electrode 16.
Referring to Fig.4, vertical blades 200 are constructed so that plate shaped electrode pieces 201 extend toward cathode 12 between electron beam passing holes 15R, 15G and 15B formed on the outgoing plane of focus electrode 15. Horizontal blades 310 are formed as a single body together with the incoming plane of dynamic focus electrode 16, by lancing the incoming plane.
Fig.5 shows yet another embodiment of the horizontal blades of the electron gun of an embodiment of the present invention.
In Fig.5, horizontal blades 320 are constructed so that a plate member 8 321, in which electron beam passing holes 16R', 16G' and 16W are formed in portions thereof corresponding to the holes 16R, 16G and 16B of dynamic focus electrode 16 and electrode pieces 322 for insertion into slots 301 of focus electrode 15 are provided on the tops and bottoms of the beam passing holes of the plate member, is fixed to dynamic focus electrode 16.
As still another embodiment of the vertical blades, as shown in Fig.6, perimeter electrode members 211 surrounding outer electron beam passing holes 15R and 15B may be fixedly provided on the inner surface of the outgoing plane of focus electrode 15. As another embodiment of the horizontal blades shown in Figs.7 and 8, one lateral plate-shaped member 331 is provided on the top and bottom of electron beam passing holes 16R, 16G and 16B of dynamic focus electrode 16, respectively. In this case, one slot 301' into which plate-shaped member 331 is inserted should be formed on the top and bottom of electron beam passing holes 15R, 15G and 15B of focus is electrode 15, respectively.
In order to vary the effects of the quadrupole lens formed by vertical blades 200 or 210 and horizontal blades 300, 310, 320 or 330, the length of the horizontal blades inserted into slot 301 or 301' of focus electrode 15 and the length of the vertical blades protruded toward cathode 12 on the inner surface of the outgoing plane of focus electrode 15 may be determined by design.
During the operation of the electron gun for a color cathode ray tube, 9 voltages are applied to the respective electrodes, as follows.
A voltage of SO- 1 70V is applied to the cathode. A voltage of - 1 00-OV is applied to control electrode 13. A voltage of 400-80OV is applied to screen electrode 14. An anode voltage Va of 2030kY is applied to final accelerating electrode 17. A focus voltage W being 20-30% of anode voltage Va is applied to focus electrode 15. A dynamic focus voltage Wd being 0.3-1.SkV greater than focus voltage W is applied to dynamic focus electrode 16. The dynamic focus voltage is varied while being synchronized with the deflection signal of the deflection yoke.
Now, the operation of the electron gun of a color cathode ray tube of the present invention will be explained.
As predetermined voltages are applied to the respective electrodes of the electron gun for a color cathode ray tube of the present invention, a prefocus lens is formed between screen electrode 14 and focus electrode 15.
If dynamic focus voltage Wd is applied to dynamic focus electrode 16, a quadrupole lens is formed between focus electrode 15 and dynamic focus electrode 16. A major lens is formed between dynamic focus lens 16 and final accelerating electrode 17.
The electron beam emitted from cathode 12 is projected throughout the phosphor screen, after passing through the electron lenses formed between the respective electrodes. The state of a projected electron beam can be regarded as being one of two cases: when the beam is projected onto the center of the phosphor screen and when the beam is projected onto the periphery thereof.
First, when the electroft beam emitted from electron gun 10 is projected onto the center of a phosphor screen, since the electron beam is not deflected by the deflection yoke, the dynamic focus voltage Wd is not applied to dynamic focus electrode 16, and only focus voltage W is applied thereto.
Therefore, a potential difference does not exist between focus electrode 15 and dynamic focus electrode 16 so that the quadrupole lens is not formed between vertical blades 200 and horizontal blades 300. The electron beam emitted from cathode 12 is initially converged and accelerated by the prefocus lens and finally converged and accelerated by the major lens so as to be optimally focused on the center of the phosphor screen. Accordingly, the spot of the electron beam landing on the phosphor screen forms a small circle.
When the electron beam emitted from cathode 12 is projected onto the periphery of the phosphor screen, focus voltage W is applied to focus is electrode 15 and dynamic focus voltage Wd which is varied while synchronous to the deflection signal is applied to dynamic focus ele ctrode 16.
Thus, a potential difference is created between vertical blades 200 and horizontal blades 300 so as to form the quadrupole lens. Therefore, the electron beam, which is emitted from cathode 12 and first converged and accelerated via the prefocus lens, is vertically elongated by passing through the quadrupole lens formed between vertical blades 200 and horizontal blades 300. The vertically elongated electron beam is then converged and accelerated 11 via the major lens, and deflected by the deflection yoke so as to be projected toward the periphery of the phosphor screen. When the vertically elongated electron beam is thus deflected by the deflection yoke, the beam is laterally distorted by the nonuniformity of the deflection magnetic field. Accordingly, a circular spot is formed of the electron beam projected toward the periphery of a phosphor screen.
More specifically, as shown in Fig.9, the electron beam passing the quadrupole lens formed due to the potential difference between the vertical blades 200 extended to cathode 12 by a predetermined length on both sides of the respective electron beam passing holes 15R, 15G and 15B formed on the outgoing plane of focus electrode 15, and horizontal blades 300 installed on the miconung plane of dynamic focus electrode 16 and inserted into slots 301 formed on the outgoing plane of focus electrode 15, receives a strong converging force horizontally and a strong diverging force vertically. This is elongates the cross section of the electron beam vertically, and thus makes the beam's vertical focusing formed farther than its horizontal focusing. Since the vertically elongated electron beam receives a vertically strong converging force and a horizontally weak converging force due to the nonuniform magnetic field of the deflection yoke, the cross section of the electron beam vertically elongated by the quaqrupole lens formed by vertical blades 200 and horizontal blades 300 is circular when the beam lands on the periphery of the phosphor screen.
12 Since dynamic focus voltage Vfd which takes focus voltage W as its rcfcrcnec fi Applicd to dynamic fow clcctrodc 16, the potential diffcrcflcc between final accelerating electrode 17 and dynamic focus electrode 16 is reduced to thereby decrease the intensity of the major lens. This increases the focal length of the electron beam as compared with projecting the electron beam toward the center of the phosphor screen, and thereby attains optimum focusing when the electron beam is projected to the screen's periphery. In the electron gun for a color cathode ray tube of the present invention, since vertical blades 200 and horizontal blades 300 are located inside focus electrode 15 to form the quadrupole lens therein, the influence of leakage current flowing along the inner circumference of the neck is reduced.
Especially, if the vertical blades consist of perimeter electrode members 211 surrounding the outer electron beam passing holes as shown in Fig.6, the reduction effect of the externally prevailing electrical field can be doubled.
The quadrupole lens formed by the horizontal blades 310, 320 and 330 and vertical blades 200 and 210 of other embodiments, i.e., those shown in Figs.4, 5, 6, 7 and 8 functions in the same manner as above.
As described above, in the electron gun for a color cathode ray tube of the present invention, the distortion of the electron beam caused due to the nonuniform deflection magnetic field during the deflection of the electron beam by the deflection yoke is compensated for by the potential difference between the vertical blades and the horizontal blades of the focus electrode 13 and dynamic focus electrode. This alleviates astigmatism and hnproves the focusing of the electron beam".
The present invention is not confined to the in-line electron gun having three cathodes as described in the embodiments but can be widely employed to electron guns emitting a single beam or a plurality of electron beams.
14
Claims (14)
1. An electron gunfor a color cathode ray tube comprising three cathodes disposed in line, a focus electrode, a dynamic focus electrode and a final accelerating electrode which are sequentially disposed along the axis of the electron gun, wherein vertical blades which extend toward said cathodes for a predetermined length are provided between electron beam passing holes provided on the outgoing plane of said focus electrode, a plurality of slots are provided laterally on the top and bottom of said electron beam passing holes, and horizontal blades inserted into said slots are provided on the top and bottom of electron beam passing holes provided on the incoming plane of said dynamic focus electrode, and wherein, in use, a predetermined focus voltage is applied to said focus electrode, and a dynamic focus voltage, which is variably greater than said focus voltage according to the deflection of the is electron beam, is applied to said dynamic focus electrode.
2. An electron gun for a color cathode ray tube as claimed in claim 1, wherein said vertical blades are constructed such that plate-shaped electrode pieces are attached to both edges of said electron beam passing holes on the inner surface of the outgoing plane of said focus electrode.
3.An electron gun for a color cathode ray tube as claimed in claim is 1 or 2, wherein said horizontal blades placed on said dynamic focus electrode are formed by cutting and bending the incoming plane of said dynamic focus electrode.
4. An electron gun for a color cathode ray tube as claimed in claim 1 or 2, wherein said horizontal blades are constructed such that a plateshaped member, in which electron beam passing holes are provided in portions thereof corresponding to the electron beam passing holes of said dynamic focus electrode and electrode pieces inserted into said slots of said focus electrode are provided on the top and bottom of said electron beam passing holes of said member, is fixed to said dynamic focus electrode.
5. An electron gun for a color cathode ray tube as claimed in any preceding claim, wherein the length projected to said cathodes of said horizontal blades is different from that of said vertical blades.
6. An electron gun for a color cathode ray tube comprising three is cathodes disposed in line for emitting three electron beams, a focus electrode, a dynamic focus electrode and a final accelerating electrode which are sequentially disposed along the axis of the electron gun, wherein a plurality of horizontal blades inserted into slots formed on the top and bottom of electron beam passing holes of said focus electrode are 16 provided on the incoininr piano Of ifild dyflEic focus clccodc, fifid VerticAl blades made of a perimeter elctrode member surrounding said electron beam passing holes and said horizontal blades are provided on the inner surface of the outgoing plane of said focus electrode, and wherein, in use, a predetermined focus voltage is applied to said focus electrode, and a dynamic focus voltage, which is variably greater than said focus voltage according to the deflection of the electron beam, is applied to said dynamic focus electrode.
7. An electron gun for a color cathode ray tube as claimed in clahn 6, wherein said horizontal blades are constructed such that plate-shaped electrode pieces are attached to the top and bottom of said electron beam passing holes on the incoming plane of said dynamic focus electrode.
8. An electron gun for a color cathode ray tube as claimed in claim 6, wherein said horizontal blades placed on said dynamic focus electrode are is formed by cutting and bending the incoming plane of said dynamic focus electrode.
9. An electron gun for a color cathode ray tube as claimed in cl IM 6, wherein said horizontal blades are constructed such that a plate- shaped member, in which electron beam passing holes are formed in the portions 17 thereof corresponding to said electron beam passing holes of said dynamic focus electrode and an electrode pieces inserted into said slots of said focus electrode are provided on the top and bottom of said electron beam passing holes of said member, is fixed to said dynamic focus electrode.
10. An electron gun for a color cathode ray tube as claimed in any of claims 6 to 9, wherein the length projected to said cathodes of said horizontal blades is different from that of said vertical blades.
11. An electron gun for a color cathode ray tube comprising three cathodes disposed in line, a focus electrode, a dynamic focus electrode and a final accelerating electrode which are sequentially disposed along the axis of the electron gun, wherein vertical blades which extend towards said cathodes by a predetermined length are provided between electron beam passing holes formed on the outgoing plane of said focus electrode, one slot is provided is laterally on the top and bottom of said electron beam passing holes, respectively, and one horizontal blade inserted into said slot is provided on the top and bottom of said electron beam passing holes provided on the incoming plane of said dynamic focus.electrode, respectively, and wherein, in use, a predetermined focus voltage is applied to said focus electrode, and a dynamic focus voltage, which is variably greater than said focus voltage 18 according to the deflection of the electron beam, is applied to said dynamic focus electrode.
12. An electron gun for a color cathode ray tube as claimed in clahn 11, wherein said horizontal blade is made of a plate-shaped member.
13. An electron gun for a color cathode ray tube substantially as hereinbefore described with reference to Figure 3 with or without reference to any of Figures 4 to 7 of the accompanying drawings.
14. A cathode ray tube comprising an electron gun of any preceding claim.
T
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019920027562A KR950004627B1 (en) | 1992-12-31 | 1992-12-31 | Electron gun for colored cathode ray tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9326593D0 GB9326593D0 (en) | 1994-03-02 |
| GB2274020A true GB2274020A (en) | 1994-07-06 |
Family
ID=19348767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9326593A Withdrawn GB2274020A (en) | 1992-12-31 | 1993-12-31 | Electron gun for colour cathode ray tube |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JP2686225B2 (en) |
| KR (1) | KR950004627B1 (en) |
| CN (1) | CN1057636C (en) |
| DE (1) | DE4345036A1 (en) |
| GB (1) | GB2274020A (en) |
| TW (1) | TW384492B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2281657A (en) * | 1993-09-04 | 1995-03-08 | Gold Star Co | Electron gun with astigmatism correction |
| EP0698906A1 (en) * | 1994-08-23 | 1996-02-28 | Matsushita Electronics Corporation | Color picture tube and in-line electron gun |
| GB2307593A (en) * | 1995-11-24 | 1997-05-28 | Samsung Display Devices Co Ltd | Electron gun for color cathode ray tube |
| US5760550A (en) * | 1995-09-05 | 1998-06-02 | Matsushita Electronics Corporation | Color picture tube |
| EP1333463A3 (en) * | 2002-02-01 | 2005-06-15 | Matsushita Electric Industrial Co., Ltd. | Electron gun and color picture tube apparatus that attain a high degree of resolution over the entire screen |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0837487B1 (en) * | 1996-10-21 | 2002-11-13 | Lg Electronics Inc. | Focusing electrode in electron gun for color cathode ray tube |
| KR20000014652A (en) * | 1998-08-22 | 2000-03-15 | 구자홍 | Electron gun for a color braun tube |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0235975A1 (en) * | 1986-02-12 | 1987-09-09 | Rca Licensing Corporation | CRT and color display system |
| EP0241218A2 (en) * | 1986-04-03 | 1987-10-14 | Mitsubishi Denki Kabushiki Kaisha | Cathode ray tube apparatus |
| US4772827A (en) * | 1985-04-30 | 1988-09-20 | Hitachi, Ltd. | Cathode ray tube |
| GB2232527A (en) * | 1989-06-10 | 1990-12-12 | Samsung Electronic Devices | Dynamic focus electron gun |
| US5015910A (en) * | 1988-09-16 | 1991-05-14 | Hitachi, Ltd. | Electron gun for color picture tube |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03179646A (en) * | 1989-12-06 | 1991-08-05 | Hitachi Ltd | Electron gun for color picture tube |
| JP3053828B2 (en) * | 1990-02-08 | 2000-06-19 | 株式会社日立製作所 | Color cathode ray tube |
| US8305917B2 (en) * | 2009-03-23 | 2012-11-06 | Motorola Solutions, Inc. | System and method for maintaining a backup radio operating parameter list in a secondary use communication system |
-
1992
- 1992-12-31 KR KR1019920027562A patent/KR950004627B1/en not_active Expired - Fee Related
-
1993
- 1993-12-28 TW TW082111101A patent/TW384492B/en not_active IP Right Cessation
- 1993-12-28 JP JP5336093A patent/JP2686225B2/en not_active Expired - Lifetime
- 1993-12-30 DE DE4345036A patent/DE4345036A1/en not_active Withdrawn
- 1993-12-30 CN CN93121742A patent/CN1057636C/en not_active Expired - Fee Related
- 1993-12-31 GB GB9326593A patent/GB2274020A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4772827A (en) * | 1985-04-30 | 1988-09-20 | Hitachi, Ltd. | Cathode ray tube |
| EP0235975A1 (en) * | 1986-02-12 | 1987-09-09 | Rca Licensing Corporation | CRT and color display system |
| EP0241218A2 (en) * | 1986-04-03 | 1987-10-14 | Mitsubishi Denki Kabushiki Kaisha | Cathode ray tube apparatus |
| US5015910A (en) * | 1988-09-16 | 1991-05-14 | Hitachi, Ltd. | Electron gun for color picture tube |
| GB2232527A (en) * | 1989-06-10 | 1990-12-12 | Samsung Electronic Devices | Dynamic focus electron gun |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2281657A (en) * | 1993-09-04 | 1995-03-08 | Gold Star Co | Electron gun with astigmatism correction |
| GB2281657B (en) * | 1993-09-04 | 1997-09-24 | Gold Star Co | Electron gun of a color picture tube for preventing astigmation |
| EP0698906A1 (en) * | 1994-08-23 | 1996-02-28 | Matsushita Electronics Corporation | Color picture tube and in-line electron gun |
| US5747922A (en) * | 1994-08-23 | 1998-05-05 | Matsushita Electronics Corporation | Color picture tube and in-line electron gun with focusing electrodes having elongated through holes |
| US5760550A (en) * | 1995-09-05 | 1998-06-02 | Matsushita Electronics Corporation | Color picture tube |
| GB2307593A (en) * | 1995-11-24 | 1997-05-28 | Samsung Display Devices Co Ltd | Electron gun for color cathode ray tube |
| GB2307593B (en) * | 1995-11-24 | 2000-03-08 | Samsung Display Devices Co Ltd | Electron gun for color cathode ray tube |
| EP1333463A3 (en) * | 2002-02-01 | 2005-06-15 | Matsushita Electric Industrial Co., Ltd. | Electron gun and color picture tube apparatus that attain a high degree of resolution over the entire screen |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9326593D0 (en) | 1994-03-02 |
| KR950004627B1 (en) | 1995-05-03 |
| TW384492B (en) | 2000-03-11 |
| KR940016412A (en) | 1994-07-23 |
| JPH0714526A (en) | 1995-01-17 |
| JP2686225B2 (en) | 1997-12-08 |
| CN1092905A (en) | 1994-09-28 |
| CN1057636C (en) | 2000-10-18 |
| DE4345036A1 (en) | 1994-07-07 |
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