WO2000034977A1

WO2000034977A1 - Electron gun and cathode ray tube using the electron gun

Info

Publication number: WO2000034977A1
Application number: PCT/JP1998/005490
Authority: WO
Inventors: Satoshi Moriwaki; Mitsuhiro Sugiyama
Original assignee: Hitachi, Ltd.; Hitachi Electronic Devices Co., Ltd.
Priority date: 1998-12-04
Filing date: 1998-12-04
Publication date: 2000-06-15

Abstract

A cathode ray tube provided with an electron gun having a cup-shaped electrode part, wherein the cup-shaped electrode part comprises an outside plate (4) extending along the tube axis and an inside plate (2) formed integrally with the outside plate (4) at a position closer to an electron beam than the outside plate (4) so as to enclose the electron beam. Burrs (3) are present at an end of the inside plate, which is set so as to face outward with respect to the electron beam. By applying punching and burring to an electrode part material from the same direction, burrs (3) can be formed at the opposite side to an electron beam passing hole (1). By arranging the burrs (3) of a cup-shaped electrode so as to face outward with respect to the electron beam, a cathode-ray tube can prevent electron emission from portions other than a cathode and provide a stable image.

Description

Specification

Electron gun and cathode ray tube using the same

〔Technical field〕

The present invention relates to a cathode ray tube for displaying an image on a display or the like and an electron gun used for the cathode ray tube, and more particularly to reducing unnecessary emission of electrons from an electron gun electrode and stably supplying an electron beam. The present invention relates to an electron gun capable of displaying images and a cathode ray tube capable of displaying images stably.

(Background technology)

The cathode ray tube (CRT) used for image display has a video screen on the front. It comprises a flannel section, a neck section containing the electron gun, and a funnel section connecting the panel section and the neck section.

The panel portion has a phosphor screen formed on the inner surface on the front side, and has a phosphor screen for displaying an image.

A deflection device is mounted on the outside of the funnel unit. The deflecting device scans an electron beam emitted from an electron gun on a phosphor screen coated on the inner surface of the panel.

The neck houses the electron gun inside. The electron gun is equipped with various electrodes such as a force electrode, a control electrode, a focusing electrode, and a final accelerating electrode.

The electron beam emitted from the cathode electrode is modulated by the signal applied to the control electrode, passes through the focusing electrode and the final accelerating electrode, is given the required cross-sectional shape and energy, and is applied to the fluorescent screen. Shoot. The electron beam is deflected in the horizontal and vertical directions by a deflecting device provided in the funnel on the way from the electron gun to the phosphor screen to form an image on the phosphor screen. Conventionally, a plate with an electron beam passage hole is used for the electrode parts that compose the electron gun. Electrode parts and power-up electrode parts are used. These electrode parts

□

DP forms the electrode of the electron gun as a single plate electrode or cup electrode, or as a composite electrode bonded by welding or the like. An electrode part having a cylindrical portion extending along the tube axis of the cathode ray tube and a surface perpendicular to the tube axis was defined as a cup-shaped electrode. Usually, the top surface of the cup-shaped electrode component forms an electron lens with the opposing electrode. There is a potential difference between the cup-shaped electrode component and the opposing electrode. In particular, when a cup-shaped electrode component having burrs, which are unnecessary projections generated during electrode pressing, is used on the low potential side, the electric field concentrates near the burrs protruding into the electron beam passage holes. . When the electric field is concentrated, electrons are emitted from the paste.

Since the potential of the electrode that has emitted electrons changes, the strength of the electron lens formed by this electrode changes.

The electrons emitted from the burr collide with the neck, the phosphor screen, the electrodes, and the like. The glass of the neck is thinner than the panel, and if electrons emitted from the burr collide with the neck, the neck may burn and crack.

When the electrons emitted from the burr collide with the phosphor, the phosphor emits light. The electrons emitted from the valley are not controlled electrons for displaying an image, but display an unnecessary image on a screen. For example, there is a problem that the phosphor emits light even though a signal for displaying black on the screen is given to the cathode ray tube.

When the electron emitted from the burr collides with another electrode, current flows between the electrodes and the strength of the electron lens changes. For example, when the focusing electrode and the anode electrode are energized, the strength of the main lens is weakened, and the effects of focusing, comparability, etc. are deteriorated. These cause problems such as a decrease in the strength of the neck of the CRT, deterioration of the image, and a decrease in the electron gun function.

Conventional electron guns remove burrs to solve the above problem. For example, the burrs were pressed to remove the burrs. Alternatively, the burr was polished to remove the burr. It was difficult to completely remove the palliers. Furthermore, burrs occur partially or over the entire circumference, and it is difficult to control the height and range of burrs.

In recent years, a cathode ray tube with higher definition has been required. Accordingly, a more accurate electron gun has been required, and the presence of burrs inside the cup-shaped electrode has become a problem.

Since the top surface of the cup-shaped electrode component forms an electron lens together with the opposing electrode, the electron beam passage hole formed on the top surface of the cup-shaped electrode component is required to be formed with high precision.

Japanese Patent Application Laid-Open No. Sho 61-29663 / 1989 discloses a method of forming a forceps-shaped electrode component. Japanese Patent Application Laid-Open No. Sho 61-2966639 discloses formation of a burring pilot hole. Japanese Patent Application Laid-Open No. Sho 61-29663 / 1989 does not consider any burrs generated on the electrode parts.

In addition, Japanese Patent Application Laid-Open No. 2-106265 discloses a drilling of a bore. In Japanese Patent Application Laid-Open No. 2-106265, no consideration is given to burrs generated on electrode components.

An object of the present invention is to prevent the emission of the fluorescent surface by electrons emitted from other than the cathode one de, provides excellent color one cathode ray tube Four Chikarasu characteristic _c

[Disclosure of the Invention]

The invention particularly provides an outer plate surrounding the electron beam along the tube axis of the cathode ray tube, In an electron gun having a cup-shaped electrode component having an inner plate formed integrally with the outer plate and closer to the electron beam than the outer plate, the end of the inner plate of the tip-shaped electrode component has a burr. And the burrs are arranged outward with respect to the electron beam passage holes.

With such a configuration, it is possible to provide an electron gun in which unnecessary emission of electrons from the force-feed electrode component and distortion of the electron lens are suppressed. In addition, the cathode ray tube equipped with the above-mentioned electron gun prevents electrons emitted from the cup-shaped electrode parts from causing the phosphor screen to emit light, and reduces collision of electrons with the neck and discharge between the electrodes. can do.

Further, in the manufacturing process of the electron gun including the punching process and the burring process, the punching process and the burring process are pressed from the same direction. With such a manufacturing method, it is possible to provide an electron gun without burrs on the electron beam passage hole side.

[Brief description of drawings]

FIG. 1 is a top view of a cup-shaped electrode component used in the electron gun of the present invention. FIG. 2 is a sectional view taken along the line AA of the electrode component of FIG.

FIG. 3 is a partial sectional view of an electron gun to which the present invention is applied.

FIG. 4 is a sectional view of a cathode ray tube to which the present invention is applied.

FIG. 5 is a top view of another electrode component used in the electron gun of the present invention. FIG. 6 is a BB cross-sectional view of the electrode component of FIG.

FIG. 7 is a schematic view showing a part of a process of forming an electrode component used in the electron gun of the present invention.

FIG. 8 is a schematic view showing a part of a process of forming an electrode component used in the electron gun of the present invention.

FIG. 9 is a sectional view of the hole after the hole punching step of FIG. O FIG. 10 is a schematic view showing a part of a process of forming an electrode component used in the electron gun of the present invention.

FIG. 11 is a cross-sectional view of the inner plate edge after the burring step of FIG. FIG. 12 is a view showing an assembly process of the electron gun of the present invention.

[Best mode for carrying out the invention]

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The same parts will be described with the same reference numerals.

FIG. 1 is a top view of a cup-shaped electrode component used in the electron gun of the present invention, and FIG. 2 is a cross-sectional view taken along line AA of FIG. 1 is an electron beam passage (called an electron beam passage hole), 2 is a cylindrical inner plate forming an electron beam passage hole, 3 is a burr generated at an end of the inner plate 2, 4 is a cup-shaped electrode part. An outer plate forming an outer shape, 5 is a flange, 6 is a top surface of a cup-shaped electrode component, and 7 is a bead support embedded in bead glass to support an electrode.

The electron beam passage hole is formed in the inner wall of the cylindrical inner plate 2 (hereinafter referred to as the inner plate).

The bead support 7 is formed integrally with the flange 5. Further, the bead support 7 may be formed as a separate component and fixed to the outside of the outer plate 4. The cup-shaped electrode component shown in FIG. 1 has a flange portion 5 on one side and an electron beam passage hole 1 on the other side.

The electron beam passage hole 1 of the electrode shown in FIG. 1 is a single electron beam passage hole through which three electron beams pass. When the cup-shaped electrode is assembled into an electron gun, an electron lens is formed by the electron beam passage hole 1. An electron lens is formed by a potential difference between adjacent electrodes.

In the electron gun of the present invention, the cup-shaped electrode component is generated at the end of the inner plate 2. The burrs 3 were placed on the side opposite to the electron beam passage holes 1, that is, on the outer plate 4 side. Since the burr 3 formed at the end of the inner plate is formed on the side facing the outer plate 4, the diameter of the electron beam passage hole is almost constant from the vicinity of the top surface 6 of the electrode-shaped electrode part to the end of the inner plate. Can be formed at the inner diameter. In other words, the electron gun of the present invention can prevent sudden reduction in size due to the inner diameter cover 3 of the electron beam passage hole, and can control the inner diameter of the electron beam passage hole with high accuracy. Further, the electron gun of the present invention can form an electron lens without distortion due to burrs 3.

In addition, even when the diameter of the electron beam passage hole is gradually increased or decreased from the vicinity of the top surface portion 6 of the electrode-shaped electrode component to the end of the inner wall, there is no burr on the electron beam passage hole side of the inner plate. Therefore, it is possible to prevent the inner diameter from suddenly decreasing at the end of the inner plate. In addition, it is possible to prevent distortion of the electron lens caused by the burr 3.

FIG. 3 shows an electron gun of the present invention, showing an example of an in-line electron gun structure. FIG. 3 shows a sectional view on the left side and a side view on the right side. In FIG. 3, K is a force sword, 8 is a force sword support having a force sword structure inside, 9 is a first grid electrode in a force-up shape, 10 is a second grid electrode, 11 Is the third grid electrode, 111 is the cup-shaped electrode component (cup electrode for G3) constituting the third grid electrode, 12 is the fourth grid electrode, and 13 is the fifth grid electrode divided into a plurality. Electrode (focusing electrode), 13 1 constitutes the 5-1st grid electrode, cup-shaped electrode component (cup electrode for G5-11), 13 2 constitutes the 5-1st grid electrodeップ電極部品部品部品（部品 1 1 1 1 1 1 1 1 1 1 は 1 1 力 1 1 1 1 1 1 力 1 1 1 1 1 1 1 1 1 Is a horizontal electrode plate for forming an electrostatic quadrupole electron lens, and 135 is an electrode for forming the main lens with the anode located in the fifth electrode A correction plate, 14 is an anode electrode, 14 1 is an electrode correction plate located inside the anode electrode to form a main lens together with the fifth grid electrode, 15 is a shield cup, and 16 is each electrode. Bead glass fixed in an electrically insulated state. The power source K, the first grid electrode 9 and the second grid electrode 10 form a three-pole portion for generating an electron beam.

The shield cup 15 is fixed to the anode electrode 14. The first grid electrode 9, the second grid 10, the third grid electrode 11, the fourth grid electrode 12, the fifth grid electrode 13, and the anode electrode 14 are spaced apart from each other by a predetermined distance. The beads are arranged in the tube axis direction, and the bead support of each electrode is buried and fixed in a bead glass 16.

The center-cathode and the electron beam passage holes of each electrode are arranged substantially coincident with the axis of the cathode ray tube.

The electrodes forming the main lens and the electrostatic quadrupole lens include the anode voltage E b at the anode electrode 14, the dynamic focusing voltage V df that changes with the deflection of the electron beam at the 5-2 grid electrode, and the A fixed focusing voltage V f is applied to each of the 5-1 grid electrodes.

The electron gun to which the dynamic focusing voltage V df is applied focuses the electron beam satisfactorily over the entire screen of the cathode ray tube. Such an electron gun is used for high-definition CDT and the like. For example, it is used for high-definition CDTs in which the spacing (pitch) between phosphors of the same color is 0.26 mm or less.

In FIG. 3, the cup electrode 11 for G 3 and the cup electrode 13 for G 5-11 each have an outer plate and an inner plate, and form an electron beam passage hole for each electron beam. It is a power-up electrode part.

Further, the power supply electrode 13 for G5-12, the power supply electrode 13 for G5-2, and the anode electrode 14 each have an outer plate and an inner plate, and three electron beams. To And a cup-shaped electrode part having a single electron beam passage hole. The burr generated on the inner plate of these cup-shaped electrode components is located on the surface of the inner plate on which the electron beam passage hole is not formed.

Since the potential difference between the focusing electrode 13 and the anode electrode 14 is large and the main lens is formed, the main lens with little distortion can be provided by not forming the burr 3 on the electron beam passage hole side. Thus, stable focus characteristics can be obtained.

In addition, since the cup electrode 11 for G 3 and the cup electrode 13 for G 5-11 are electrode-shaped electrode parts in which an electron beam passage hole is formed for each electron beam, the Since the distance from the electrode is short, the electron beam is easily affected by the shape of the electron beam passage hole. By disposing the burr 3 on the surface of the inner plate of the cup electrode 1 3 1 on which the electron beam passage hole is not formed, the electron lens without distortion can be formed. Can be provided. ADVANTAGE OF THE INVENTION According to this invention, the bad influence on an electron gun given by the burr which generate | occur | produces in a nap-shaped electrode component can be reduced. That is, it is possible to reduce the deterioration of the force characteristics due to burrs.

In FIG. 3, about 0 V is applied to the first grid electrode 9, about 500 V to lk V is applied to the second grid electrode 10, and about 5 k is applied to the third grid electrode 11. V to 15 kV, about 500 V to lk V for the fourth grid electrode 12, about 5 kV to 15 kV for the fifth grid electrode 13, and about 5 kV to 15 kV for the anode electrode 14. 20 kV to 30 kV are applied respectively.

The cup electrode 13 for G5-2 is opposed to the anode electrode 14 having a high potential. The cup electrode 1 3 3 for G 5-2 has the burr 3 on the side of the inner plate where the electron beam passage hole is not formed. Emission of electrons from the anode electrode side can be prevented. In FIG. 3, the cup electrode 13 for G5-2 is an electrode component having a common electron beam passage hole for three electron beams, and an electron beam passage hole is formed for each electron beam. Cup-shaped electrodes may be used.

FIG. 4 is an example of a cathode ray tube of the present invention, and is a cross-sectional view showing a schematic configuration. 17 is a panel portion, 18 is a neck portion, 19 is a funnel portion connecting the panel portion and the neck portion, 20 is a fluorescent screen (screen) formed on the inner surface of the panel and constituting an image display surface, 2 1 is a shadow mask structure having a shadow mask for color selection, 22 is a panel pin for supporting the shadow mask structure 21, 23 is a magnetic shield for shielding the funnel space from external magnetism, 2 Reference numeral 4 denotes an electron gun assembly that is housed in the neck and emits an electron beam. Reference numeral 25 denotes a deflection device (deflection yoke) for scanning the electron beam emitted from the electron gun onto the phosphor screen formed on the inner surface of the panel. ), 26 is an external correction magnetic device for performing color purity and centering correction, B is an electron beam, and T is an implosion-resistant tension band for tightening the vicinity of the connection area between the panel and the funnel. Each of the electron beams B for red, green, and blue is deflected in the horizontal and vertical directions by a deflection yoke 25 provided in a funnel section 19 on the way from the electron gun to the phosphor screen 20. Further, the electronic beam B is color-sorted by a shadow mask disposed inside the panel portion so as to correspond to each color. As a result, the electron beam B collides with the phosphor screen of each color, and the phosphor screen of each color emits light to form an image on the panel surface.

The cathode ray tube according to the present invention includes an electron gun in which a plurality of electrodes are arranged in the tube axis direction, and at least one of the plurality of electrodes of the electron gun uses a power-up electrode part. ing.

The cup-shaped electrode component has an outer plate extending along the tube axis, and an electron beam formed integrally with the outer plate and at a position closer to the electron beam than the outer plate. And an inner plate surrounding the inner plate. Chips occur at the end of the inner plate in the manufacturing process.

In the cathode ray tube of the present invention, the electrode parts for the electron gun are arranged so as to face outward with respect to the electron beam.

By arranging the burrs of the forceps-shaped electrode so as to face outward with respect to the electron beam, emission of electrons from sources other than the cathode can be prevented, and a cathode ray tube having a stable image can be provided.

In addition, the cathode ray tube of the present invention has no distortion of the electron lens caused by the burr 3, so that a high-precision electron beam spot can be formed and a high-definition image can be displayed. In particular, it is effective for a cathode ray tube having a phosphor pitch of 0.26 mm or less.

Further, since no electrons are emitted from the burrs 3 of the cup-shaped electrode component, it is possible to prevent the fluorescent screen from emitting light due to the electrons emitted from the burrs 3 and thereby display a stable image. Furthermore, it is possible to prevent electrons emitted from burrs from colliding with the glass neck portion, which is thinner than the panel, thereby preventing the neck portion from being heated, thereby suppressing cracking and implosion of the cathode ray tube. Further, discharge between the electrodes constituting the electron gun can be prevented, and a stable electron lens can be formed. That is, the image can be stabilized.

FIG. 5 is a top view showing another embodiment of the electrode component used in the electron gun of the present invention, and FIG. 6 is a cross-sectional view of the electrode component shown in FIG.

1 S is the two outer electron beam passage holes, 1 C is the central electron beam passage hole, 2 S is the inner plate forming the two outer electron beam passage holes 1 S, and 2 C is the central electron beam passage hole 1 C , 3S is a burr generated at an end of the inner plate 2S, and 3C is a burr generated at an end of the inner plate 2C.

As shown in Fig. 5, when the electrode component is viewed from the top, the glue passes through the electron beam. It is located on the outer peripheral edge of the cylindrical inner plate 2S forming the overhole.

Each burr is formed at the end of the inner plate forming each electron beam passage hole, and is formed so as to extend in a direction opposite to the center of each electron beam passage hole.

Since the burrs are arranged so as to extend in the opposite direction to the center of the electron beam passage hole, the diameter of the electron beam passage hole is formed to be substantially constant from near the top surface 6 of the forceps-shaped electrode component to the end of the inner plate. be able to. In other words, the present invention can prevent the inner diameter of the electron beam passage hole from suddenly decreasing, and can control the inner diameter of the electron beam passage hole with high accuracy.

An electron gun using such a power-supply electrode component can form an electron lens without distortion due to burrs 3.

Even when the diameter of the electron beam passage hole is gradually increased or decreased from the vicinity of the top surface 6 of the cup-shaped electrode component to the end of the inner wall, since there is no burr on the electron beam passage hole side of the inner plate, It is possible to prevent the inner diameter from suddenly decreasing at the end of the inner plate.

In particular, as shown in FIG. 5, an electrode having an electron beam passage hole for each electron beam has a short distance between the electrode and the electron beam. Therefore, the deformation of the electron beam passage hole has a great effect on the electron beam. According to the present invention, since the burrs 3 S and 3 C at the ends of the inner plates 2 S and 2 C are formed outside the electron beam, the accuracy of the electron lens is high, and the distortion of the electron lens can be suppressed. . In addition, when the main lens is formed with the top surface 6 of the electrode-shaped electrode component shown in FIG. 5 facing the anode electrode 14, a main lens with less distortion can be provided, and a stable force force can be provided. Properties can be obtained.

Next, a method for forming the electron gun of the present invention will be described.

At least the cup-shaped electrode parts constituting the electron gun are of the cup-shaped electrode parts. 形成 It is formed through a drawing process for forming the outer shape, a punching process for forming a hole in the top surface of the cup, and a pearling process for forming an inner plate for forming an electron beam passage hole.

FIG. 7 is a schematic view showing a drawing step which is a part of a step of forming an electrode component used in the electron gun of the present invention. 27 is an electrode material, and 28 is a drawing press. As shown in FIG. 7, the electrode material 27 is subjected to press working (drawing) from the direction of the arrow by a press machine 28 to form the outer plate 4. The electrode material 27 is formed into a cup shape (concave shape) by drawing. The arrow indicates the relative movement direction of the press machine 28 and the electrode material 27, and the cup may be pressed with the top surface of the cup facing upward.

After the drawing step, a hole punching step is performed.

FIG. 8 is a schematic view showing a hole punching step which is a part of a step of forming an electrode component used in the electron gun of the present invention. Reference numeral 29 denotes a punching press. Holes are formed (punching) by punching (p u n ch) the top surface of the cup-shaped electrode material 27 with a press machine 29. The electrode material 27 is punched from the outside to the inside of the cup as shown by the arrow. If the cup top surface is located at the top during punching, the dust punched by the press machine 29 will fall down, making it easier to collect the dust.

When the cup top surface is formed so as to be located on the upper side in the drawing step, hole punching can be performed without changing the vertical direction of the electrode material 27.

FIG. 9 is a sectional view of the hole after the hole punching step. 271 is a shear surface at the time of punching, and 272 is a fracture surface at the time of punching. The fracture surface 27 2 is generated on the surface of the electrode material 27 which is not in contact with the punching press machine 29. In addition, burrs 3 protruding from the side surfaces of the electrode material 27 are generated at the ends of the fracture surface 27 2. When a hole is formed by punching, burrs always occur as shown in the figure 丄 S

After the hole punching process, a burring step is performed.

FIG. 10 is a schematic view showing a burring step which is a part of a step of forming an electrode component used in the electron gun of the present invention. Numeral 30 is a press for filling. As shown by the arrows in FIG. 10, the press 30 for the no-cooling is pressed from the outside to the inside of the cup (balling). The inner plate 2 is formed by the burring process. The hole surrounded by the inner plate is the electron beam passage hole.

FIG. 11 is a cross-sectional view of the inner plate edge after the burring step. The cylindrical electron beam passage hole has a shear surface and a fracture surface at the end. The shear surface is located on the inner peripheral side of the cylindrical electrode, and the fracture surface is located on the outer peripheral side of the cylindrical electrode. Since the shear surface 27 1 is located on the electron beam passage hole side and the fracture surface 27 2 is located on the outside, the chip 3 formed on the fracture surface 27 2 side passes through the electron beam. It can be arranged outside the inner plate 2 forming the hole.

By performing the punching process and the burring process on the electrode component material from the same direction, the die 3 can be formed on the side opposite to the electron beam passage hole. In particular, in the cup-shaped electrode component having the shape shown in FIG. 2 or FIG. 6, the burr 3 faces the integrally formed electrode, and the pallet 3 faces the electrode to which another voltage is applied. Absent. Therefore, the cathode ray tube does not cause discharge between the electrodes due to the burr 3. Therefore, there is no need to delete burrs, nor is there a need for a step of removing burrs.

The molded electrode part thus formed is joined to another electrode part to form one electrode. After that, the electrode components are arranged along the same axis, and are fixed at predetermined intervals by bead supports. In particular, assemble the electron gun with the center of the center electron beam passage hole of each electrode component aligned. FIG. 12 is a view showing an assembly process of the electron gun of the present invention.

Reference numeral 31 denotes a mount bin that penetrates the electron beam passage hole for disposing the electronic components along the same axis, and 32 denotes a spacer for securing an interval between the electrodes.

The electron beam passage holes of the electrode parts are inserted into the mount pins 31 and stacked, and a spacer 32 is inserted between the electrodes to assemble the electron gun. At this time, if there is a gap inside the inner plate 2 of the cup-shaped electrode component, that is, between the portion of the cup-shaped electrode facing the electron beam and the mount pin, each electrode component must be arranged along the same axis. Can not. By contacting the mount pin with a portion of the forceps electrode facing the electron beam, the axes of the electrodes are aligned with high accuracy. With the use of the supple electrode component having the above structure, burrs generated at the inner plate edge of the supple electrode during the assembly of the electron gun do not contact the mount pin. Also, since the burrs do not contact the mount pins, the electron gun can be assembled with high accuracy without damaging the mount pins.

Further, in some cases, the electrode is formed by welding a plurality of the pliable electrode components, and the direction of insertion into the mount pin is not constant. With the above structure, no matter which direction the mount pin is inserted, the burr does not fall off due to contact with the mount pin force. When the dropped chips are carried into the cathode ray tube, they cause a discharge. According to the above structure, the burrs do not fall off, and one of the causes of the discharge can be eliminated.

The above structure is extremely effective when burrs 3 are formed all around the edge of the inner plate.Similar effects can be obtained even when burrs 3 are formed on a part of the inner plate edge. it can.

In the present invention, burrs generated in manufacturing the electron gun are arranged outside the inner plate 2 without being arranged in the electron beam passage hole. The present invention also provides a burr By arranging the electron gun 2 outside the electron gun, it is possible to provide an electron gun that prevents distortion of the electron lens and prevents emission of electrons from the paste 3 of the power electrode member. Further, by applying this electron gun to a cathode ray tube, unnecessary light emission can be prevented, distortion of an electron beam spot caused by distortion of an electron lens can be prevented, and a cathode ray tube with high definition can be provided.

[Industrial applicability]

As described above, the power cathode ray tube according to the present invention is suitable for a color cathode ray tube equipped with an electron gun using a power-up electrode component. In particular, a cup-shaped electrode component formed by press working is used. Suitable for the cathode ray tube used.

Claims

lb Claims

1.In a cathode ray tube including an electron gun in which a plurality of electrodes are arranged in the tube axis direction of the cathode ray tube, at least one of the plurality of electrodes of the electron gun has a power-up electrode part; The cup-shaped electrode component has an electron beam passage hole through which an electron beam passes, and a burr at an end of the cup-shaped electrode component is located outside the electron beam passage hole. tube.

2. The cathode ray tube according to claim 1, wherein the power-up electrode component is fixed to another electrode component to form a focusing electrode, and is positioned opposite to the anode electrode. tube.

3. The cathode ray tube according to claim 1, wherein the power-supply electrode component has three electron beam passage holes arranged horizontally.

4. The cathode ray tube has an electron gun in which a plurality of electrodes are arranged in the tube axis direction, and at least one of the plurality of electrodes of the electron gun uses a power-up electrode component; The force-applying electrode component has an outer plate forming an outer shape of the electrode component and a cylindrical inner plate forming an electron beam passage hole. The inner plate has a burr at an end, and the burr is A cathode ray tube, which is located on the outer periphery of the inner plate.

5. The cathode ray tube according to claim 4, wherein the force-feed electrode component is fixed to another electrode component to form a focusing electrode, and is located opposite to the anode electrode. tube.

6. The cathode ray tube according to claim 4, wherein the power-supply electrode component has three electron beam passage holes arranged horizontally.

7. The cathode ray tube according to claim 4, wherein the outer plate and the inner plate And the inner plate is formed at a position closer to the electron beam than the outer plate.

8. The cathode ray tube according to claim 4, wherein the burr faces the outer plate.

9. In an electron gun for a cathode ray tube in which a plurality of electrodes are arranged in a fixed direction, at least one of the plurality of electrodes of the electron gun includes a cup-shaped electrode component, and the cup-shaped electrode component is an electron beam. A cylindrical electron beam passage hole through which the electron beam passes, the cylindrical electron beam passage hole has a shear surface and a fracture surface, and the shear surface is located on the inner peripheral side of the cylindrical electrode; The electron gun is characterized in that the fracture surface is located on the outer peripheral side of the cylindrical electrode.