JPH10188844A - Color cathode ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a uniform focusing characteristic by accurately positioning a plate-shaped electrode formed with an opening hole and a bending electrode piece which is a horizontal correction plate. SOLUTION: In at least two corners of a plate-shaped electrode 4 formed with an opening hole, a first position regulating parts 5a to 5d is provided, also in a corner of a base part 1a, 1c of horizontal correction plates 3a, 3b and 3c, 3d, a second position regulation parts 5a' to 5d' corresponding to the first position regulation parts 5a to 5d is provided. In a condition that at least partly the first/second position regulation part 5a to 5d and 5a' to 5d' are conformed in a tube axial direction, the plate-shaped electrode 4 and an electron beam passing hole forming surface of the horizontal correction surface 3a, 3b and 3c, 3d are integrally fixed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color cathode ray tube, and more particularly to a color cathode ray tube equipped with a high-resolution electron gun having a plate-like electrode for correcting astigmatism.

[0002]

[Prior art]

BACKGROUND OF THE INVENTION The resolution that determines the image quality of a color television picture tube or color display tube largely depends on the diameter and shape of the electron beam spot on the screen constituting the phosphor screen.

That is, high resolution cannot be obtained unless the electron beam spot, which is a bright spot generated on the screen by the electron beam impact, is small in diameter and close to a perfect circle.

However, since the trajectory of the electron beam from the electron gun to the screen becomes longer toward the periphery of the screen as the deflection angle of the electron beam increases, an electron beam spot with a small diameter and a perfect circle is obtained at the center of the screen. Even if the focus voltage is maintained at an optimum value, it is impossible to obtain a good electron beam spot and a high resolution around the spot.

Therefore, as the deflection angle of the electron beam increases, the focus voltage is increased, and the electric field of the main lens is reduced.
So-called dynamic focus method is adopted,
When this method is applied to an in-line type color cathode ray tube having an electron gun which emits three electron beams arranged in one horizontal direction, there are problems as described below.

That is, in order to obtain a self-convergence effect, an in-line type color cathode ray tube in which three electron beam emitting portions are arranged on a straight line in the horizontal direction has a horizontal deflection magnetic field in a pincushion shape and a vertical deflection magnetic field in a barrel. Since the electron beams are respectively distorted in the same shape, the cross-sectional shape of the electron beam that has passed through the deflection magnetic field is distorted into a non-circular shape.

[0007] The screen surface is usually rectangular in shape, that is, its side is long, that is, the side in the electron beam arrangement direction (horizontal direction) is long.

FIG. 6 is a schematic diagram showing the relationship between the horizontal deflection magnetic field of the pincushion magnetic field distribution and the deflection of the electron beam, and FIG. 7 is an explanatory view of the shape of the electron beam spot on the screen, where B (Bs, Bc, Bs). ) Is an electron beam, H is a horizontal direction, V is a vertical direction, B _H is a horizontal deflection magnetic field, B _H1 is a dipole magnetic field component, B _H2 is a quadrupole magnetic field component, B _C is a high brightness part (core part), B _L Denotes a low luminance portion (haze portion).

As shown in FIG. 6A, three electron beams B (Bs, Bc, Bs) undergo a deflection action in the direction of arrow H by passing through a pincushion-like horizontal deflection magnetic field _BH. . The pincushion magnetic field is considered to be composed of a dipole magnetic field component shown in FIG. 4B and a quadrupole magnetic field component shown in FIG. 4C. The quadrupole magnetic field component gives a self-convergence effect. Regarding the beam, a diverging effect is given in the horizontal direction and a focusing effect is given in the vertical direction, and the electron beam B has a horizontally long flat cross section in the horizontal direction.

The diverging action acts in such a direction as to cancel the overfocus of the electron beam spot due to an increase in the electron beam trajectory with an increase in the deflection angle of the electron beam. Therefore, in the in-line type color cathode ray tube, the electron beam spot In the horizontal direction, the optimal focus state is maintained during the deflection period. However, in the vertical direction, the degree of overfocus is significantly increased by the addition of the focusing action.

As a result, the electron beam spot generated at the center of the screen is circular as shown in FIG. 7B, whereas the electron beam spot generated at the peripheral portion in the horizontal direction of the screen is High brightness area B _C and low brightness area B
_L becomes non-circularly distorted, and particularly a large vertical extension of the low-luminance portion B _L adversely affects the focus characteristic.

In such a case, when the conventional dynamic focus method is applied, the dynamic focus method uniformly weakens the lens action of the main lens regardless of the horizontal direction and the vertical direction. Even if B _L is removed, the horizontal direction, which is already in the optimum focus, is in an underfocus state, and the diameter in the horizontal direction increases.

As a result, the diameter of the electron beam spot becomes extremely long horizontally, and the resolution in the horizontal direction decreases.

FIG. 8 is a schematic cross-sectional view taken along a vertical direction along a tube axis for explaining a schematic structure example of an electron gun of a conventional color cathode ray tube for obtaining the above-mentioned high resolution. 8 (a) is a front view taken along line AA of FIG. 8, and FIG. 8 (b) is a front view taken along line BB of FIG.

In FIG. 8, three cathodes K (only a central cathode is shown) arranged in a horizontal straight line are control electrodes G.
₁ , acceleration electrode G ₂ , first focusing electrode G ₃ , second focusing electrode G
₄ constitute an in-line electron gun with the final accelerating electrode (anode) G _5. In addition, SC is a shield cup.

[0016] As shown in FIG. 9, the first focusing electrode G ₃ electron beam passing holes 4a of the three circular on the surface facing the second focusing electrode G _4, 4b, the plate-shaped electrode 4 having 4c And four horizontal correction plates 3a, 3b, 3c sandwiching each of these electron beam passage holes from the horizontal direction. The second focusing electrode G ₄ has a single opening 8 c on the surface facing the first focusing electrode 4 for passing three electron beams, and two vertical electrodes 8 a sandwiching the opening 8 c from the vertical direction. , 8b. The main lens is formed between the second focusing electrode G ₄ and the anode G _5.

The first focus voltage of a fixed to the first focusing electrode G ₃ is, the anode G ₅ is a high voltage (anode voltage), the second focusing electrode G ₄ with the voltage of the fixed deflection of the electron beams Thus, a second focus voltage on which a dynamic voltage that changes to a value higher than the first focus voltage is superimposed is applied.

Accordingly, at the time when the horizontal deflection becomes zero, that is, at the center of the screen where the voltage difference between the first focusing electrode G ₃ and the second focusing electrode G ₄ is minimum, the electron beam passage holes and the openings of both electrodes are vertically elongated. Or, even if it is horizontally long, these shapes hardly affect the electron beam. Then, a potential difference occurs between the second focusing electrode G ₄ and the anode G _5, wherein the main lens is formed, the three electron beams are focused at optimum focus on the screen center part.

[0019] When the deflection angle of the electron beam increases, the potential of the second focus electrode G ₄ becomes higher than the potential of the first focusing electrode G _3, the horizontal correction plate 3a between both the electrodes, 3b, 3c and vertical correction plate 8a and 8b generate an electrostatic quadrupole lens electric field. Further, since the potential difference between the second focusing electrode G ₄ and the anode G ₅ is reduced lens action of the main lens is weakened.

[0020] FIG. 10 is an explanatory view of the electrostatic quadrupole lens action shown in FIG. 9, the horizontal correction plate 3 of the first focusing electrode G ₃
b, 3c to V _1, the second focusing electrode G ₄ vertical correction plate 8a,
The electric field of the electrostatic quadrupole lens generated between both electrodes under the condition of V ₁ <V ₂ by applying the potential of V _{2 to} 8b is as shown in the figure. The equipotential lines constituting this quadrupole lens electric field are represented by B
It becomes a potential vector as shown by _H2 .

Due to the electric field of the electrostatic quadrupole lens, forces F _{V and} F _H diverging in the vertical direction (vertical direction) and converging in the horizontal direction (horizontal direction) act on the electron beam B, and a vertically long sectional shape is obtained. Will have. This is opposite to the case where the electron beam passing through the deflection magnetic field has a horizontally long cross-sectional shape due to the quadrupole component as shown in FIG. 6C. It is to prevent conversion.

Further, as the deflection angle is increased, the focusing effect of the main lens is weakened as described above, so that overfocusing due to the deflection of the beam spot can be prevented at the same time, and the diameter of the peripheral portion of the screen is reduced. A beam spot close to a perfect circle is generated.

[Prior Art] The horizontal correction plate constituting the above-mentioned electrostatic quadrupole lens has three circular electron beam passage holes 4a, 4b, 4c as shown in FIGS. It is formed by welding to the plate electrode 4.

FIGS. 11A and 11B are schematic views for explaining the structure of an assembling jig for fixing a horizontal correction plate to a plate-like electrode constituting an electrostatic quadrupole lens, wherein FIG. 11A is a top view, and FIG. () Is a cross-sectional view along the line CC in (a).

In this assembling jig, pins 7a, 7b, and 7c for inserting three electron beam passage holes formed in the plate-shaped electrode and the horizontal correction plate into the substrate 11 are planted, and the pins 7a, 7a, Slits 10a, 10b, 10c for positioning the horizontal correction plate are formed at the bases of 7b, 7c. The horizontal correction plates 3a, 3b, 3c are formed of electrode pieces in which both ends in the horizontal direction of the electron beam passage hole of the base on which the electron beam passage hole is formed are folded (bent).

FIG. 12 is an explanatory view showing a state in which the electron beam passage holes of the plate-like electrode and the horizontal correction plate are inserted and positioned in the assembly jig shown in FIG. 11, (a) is a top view,
(B) is sectional drawing along the DD line of (a).

As shown in the drawing, the pins 7a, 7b, 7c of the assembly jig are passed through the electron beam passages formed on the bases of the horizontal correction plates (return electrode piece portions) 3a, 3b and 3c, 3d. The horizontal correction plate 3
a, 3b, 3c, 3d are slits 10a, 10b, 10
c, 10d, and then the electron beam passage holes 4a, 4b, 4c of the plate electrode 4 are inserted into the pins 7a, 7b, 7c, and they are welded together in a state where they are stacked on the previously inserted horizontal correction plate. And integrated.

[0028]

In the above-described fixing of the aperture forming electrode and the bent electrode piece typified by the plate-shaped electrode and the horizontal correction plate of the electrostatic quadrupole lens, the plate-shaped electrode 4 and the horizontal correction plate 3 are fixed.
Positioning of a, 3b, 3c and 3d is performed by bending accuracy L shown in FIG.
And 10b, 10c and 10d.

Since the bending accuracy has a tolerance at the time of press working and a processing tolerance of a pin or a slit of a jig, the assembling accuracy varies.

In particular, in an electron gun having the above-described electrostatic quadrupole lens, such a variation in assembling accuracy causes the focus characteristics of a color cathode ray tube to vary, but in a conventional electrode structure, the assembling accuracy is reduced. It was difficult to improve.

An object of the present invention is to solve the above-mentioned problems of the prior art, and to form a plate electrode of an electrostatic quadrupole lens, an aperture forming electrode represented by a horizontal correction plate, and a bending electrode piece with high precision. An object of the present invention is to provide a color cathode ray tube having an electron gun capable of obtaining uniform focus characteristics by positioning.

[0032]

According to a first aspect of the present invention, there is provided a plate-like first electrode having an electron beam passage hole, the first electrode having an electron beam passage hole, A second electrode having a coaxial electron beam passage hole and having not more than three electron beam passage holes formed with electrode pieces cut and raised in a direction perpendicular to a plane parallel to the plane of the first electrode; An electrode having an electrode structure in which the electron beam passage holes of the respective electrodes are coaxially positioned and the electrode pieces formed on the second electrode are welded so as to sandwich the respective electron beam passage holes from the horizontal direction. In a color cathode ray tube equipped with a gun, a position restricting portion other than a first electron beam passage hole is provided at at least one or more corners of the first electrode, and the position of the first electrode of the second electrode is reduced. Second position rule corresponding to notch The first electrode and the second electrode are integrally fixed with the electron beam passage hole forming surfaces of the first electrode and the second electrode in a state where at least a part of the first and second position regulating portions substantially coincide with each other in the tube axis direction. It is characterized by becoming.

According to a second aspect of the present invention, a cathode for emitting three electron beams arranged in-line, a control electrode, an acceleration electrode,
An electron gun in which a focusing electrode and an anode are arranged in the tube axis direction; the focusing electrode is divided into at least two along the tube axis direction;
A pair of vertical correction plates extending in parallel toward the other focusing electrode sandwiching the electron beam from the vertical direction is installed, and the other of the other focusing electrodes is opposed to the one focusing electrode. A color cathode-ray tube including an electron gun provided with two pairs of horizontal correction plates extending in parallel to the one focusing electrode with each of the three electron beams interposed therebetween in the horizontal direction; The surface of the electrode facing the one electrode has a plate-like electrode having three electron beam passage holes respectively corresponding to the three electron beams, and is cut and raised in a direction perpendicular to the horizontal correction plate. The electrode piece is formed by bending from a base having one or more electron beam passage holes formed coaxially or asymmetrically in correspondence with each of the three electron beams, and at least one of the plate electrodes is formed. Corner of In addition to having a first position restricting portion, a second position restricting portion corresponding to the first position restricting portion is provided at a corner of a base of the horizontal correction plate, and the first position restricting portion and the second position restricting portion are provided. The plate-shaped electrode and the electron beam passage hole forming surface of the horizontal correction plate are integrally fixed in a state where at least a part of the position regulating portion is substantially aligned in the tube axis direction.

[0034] The third invention according to claim 3 provides:
One or both of the first position restricting portion and the second position restricting portion in the first or second invention are formed in a concave portion formed on an outer edge of the plate-shaped electrode or the horizontal correction plate, or formed near the outer edge. It is one of the openings.

In each of the above-mentioned configurations, the position is set using the electron beam passage hole of each electrode and the second position restricting portion formed at the corner of the base of the horizontal correction plate, and then welding is performed. It is not necessary to use an electrode piece cut and raised in a right angle direction as a position regulating portion, and positioning is performed with high accuracy.

[0036]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to examples.

FIG. 1 shows a plate provided on a focusing electrode as the plate-like first electrode for forming an electrostatic quadrupole lens constituting an electron gun used in an embodiment of a color cathode ray tube according to the present invention. It is an explanatory view of an electrode structure in which a shape electrode and a horizontal correction plate of the second electrode are integrally fixed, wherein (a) is a front view as viewed from the one electrode side, and (b) is a view of (a). FIG. 4 shows a cross-sectional view along the line EE.

In the figure, reference numerals 1a and 1c denote base portions of a horizontal correction plate, 2a and 2c are electron beam passage holes formed in the base portions 1a and 1c, and 3a and 3b are electrode pieces obtained by bending both ends of the base portion 1a in the horizontal direction. The horizontal correction plate, 3c and 3d are the base 1
c, a horizontal correction plate composed of an electrode piece bent at both ends in the horizontal direction, 4 is a plate-like electrode, and 4a, 4b, 4c are electron beam passage holes formed in the plate-like electrode 4.

Concave portions 5a, 5b, 5c and 5d as first position regulating portions are formed in the squares of the plate-like electrode 4, and the concave portions 5a and 5c are formed at outer corners of the base portions 1a and 1c, respectively.
b, recesses 5a ', 5b', 5 corresponding to 5c and 5d
c ′ and 5d ′ are formed.

The recesses 5a, 5b, 5c, 5d and the recess 5
a ', 5b', 5c ', and 5d' have the same curved inner surfaces, and completely overlap in the tube axis direction.

FIG. 2 is an exploded perspective view showing the configuration of the electrode assembly shown in FIG. 1 in detail.

As shown, the electron beam passage holes 4a and 4c located at both ends in the horizontal direction of the plate-like electrode 4 have the electron beam passage holes 2a formed in the bases 1a and 1c forming the horizontal correction plates 3a and 3b. Superposition is performed so that the centers of 2c coincide. In this superposition, the electron beam passage holes 4a and 4c of the plate electrode 4 and the concave portions 5a and
5b, 5c, and 5d, and concave portions 5a ', 5b', and 5 formed in the corners of the electron beam passage holes 2a, 2c and the corners of the bases 1a, 1c.
The horizontal correction plates 3a, 3b and 3 formed on the bases 1a and 1c for the electron beam passage holes 4a and 4c of the plate electrode 4 by regulating c 'and 5d' with a jig (not shown).
The positions of c and 3d are aligned with high accuracy.

FIGS. 3A and 3B are explanatory views of an assembling jig for positioning and welding the plate-like electrode and the horizontal correction plate shown in FIG. 2 with high precision, and FIG. 3A is a front view, and FIG. b) is (a)
FIG. 2 is a cross-sectional view taken along line FF of FIG.

The assembling jig 11 includes pins 7a and 7c for inserting the electron beam passage holes 4a and 4c of the plate electrode on the upper surface of the substrate portion 11a, and concave portions 5 formed at four corners of the plate electrode 4.
Pins 6a, 6b, 6c, and 6d for regulating the position by abutting against a, 5b and 5c, 5d from outside are planted.

FIG. 4 is an explanatory view showing a state where a plate-like electrode and a horizontal correction plate are set on the assembly jig shown in FIG.
(A) is a front view, (b) is a cross-sectional view along line GG of (a).

As shown in the figure, when assembling an electrode assembly in which a plate-shaped electrode and a horizontal correction plate are integrated, first, the electron beam passage holes 4a and 4c of the plate-shaped electrode 4 are inserted into the pins 7a and 7c, and Recesses 5a, 5b, 5c formed at the four corners,
5d is guided to pins 6a, 6b, 6c, and 6d, and jig 1
It is placed on the upper surface of one substrate part 11a.

Thereafter, the horizontal correction plates 3a, 3b and 3
The electron beam passing holes 2a and 2c formed in the bases 1a and 1c are inserted into the pins 7a and 7c with the c and 3d facing upward, and the recesses 5a ', 5b',
It is mounted on the plate electrode 4 while being guided by 5c ', 5d' pins 6a, 6b, 6c, 6d.

Thus, the positions of the horizontal correction plates 3a, 3b and 3c, 3d with respect to the electron beam passage holes 4a, 4b, 4c of the plate electrode 4 are accurately regulated. In this state, the plate-shaped electrode 4 and the bases 1a and 1c of the horizontal correction plates 3a, 3b and 3c, 3d are spot-welded to obtain an integrated electrode structure.

The horizontal jig 3 is attached to the assembly jig 11.
It is also possible to provide the reliefs for a, 3b and 3c, 3d and insert the plate electrode 4 downward, and then place the plate electrode 4 thereon. Further, a pin for guiding the electron beam passage hole 4b at the center of the plate electrode 4 may be provided on the assembly jig.

In the above embodiment, the bases 1a and 1d of the plate electrode 4 and the horizontal correction plates 3a, 3b and 3c, 3d are used.
Although the first and second position regulating portions formed in c are concave portions,
The present invention is not limited to this, and the pins 6a, 6b, 6c, 6d
The opening may be inserted through the opening.

Further, in the above embodiment, the position regulating portions are formed at the four corners of the plate electrode 4, and the base portions 1a and 1c of the horizontal correction plates 3a, 3b and 3c, 3d correspond to the position regulating portions.
Although the position restricting portions are respectively formed at the corresponding positions, two position restricting portions may be formed at the diagonal corners of the plate electrode 4 and the bases 1a and 1c. Further, even if the first position regulating portion of the plate-shaped electrode 4 does not coincide with the horizontal correction plates 3a, 3b and 3c, 3d, the electrode piece cut and raised in the direction perpendicular to the horizontal correction plate is not used as the position regulating portion. May be.

FIG. 5 is a sectional view taken along a tube axis for explaining the overall structure of the color cathode ray tube according to the present invention, in which 20 is a face plate, 21 is a neck, 22 is a funnel connecting the face plate and the neck, Reference numeral 23 denotes a phosphor screen formed on the inner surface of the face plate to form an image display surface; 24, a shadow mask as a color selection electrode;
Reference numeral 5 denotes a mask frame that holds the shadow mask to form a shadow mask structure, 26 denotes an inner shield that shields external magnetism, and 27 denotes a suspension spring mechanism that suspends and supports the shadow mask structure on a stud erected on the inner side wall of the face plate. , 28 are electron guns that house three electron beams Bs (× 2) and Bc housed in the neck, 29 is a deflecting device that deflects the electron beam horizontally and vertically, and 30 is a device that corrects color purity and centering. Magnetic device, 31 is a getter, 32 is an internal conductive film, and 33 is an explosion-proof band.

In the configuration shown in FIG.
0, a neck 21 and a funnel 22 constitute a vacuum envelope, and three electron beams Bc and Bs × 2 emitted from the electron gun 28 in a horizontal line (inline) are used by a deflection device 29 to form a deflection magnetic field. To deflect in two directions, horizontal and vertical, to scan the phosphor screen 23 two-dimensionally.

The three electron beams Bs and Bc × 2 emitted from the electron gun 28 are red (side beam Bs), respectively.
The phosphor screen 23 is modulated by color signals of green (center beam Bc) and blue (side beam Bs) and receives color selection by a beam passage hole of a shadow mask 24 disposed immediately before the phosphor screen 23. A required color image is reproduced by projecting on each of the phosphor mosaics of three colors of red, green and blue.

The electron gun 28 has the electrode structure described in the above embodiment, and can obtain a good focus over the entire fluorescent screen.

The second electrode in the above embodiment has the base 1a and the base 1c separated from each other, but the present invention is not limited to this. The base 1a and the base 1c are integrated, or the base 1a is separated. And base 1c, horizontal correction electrode plates 3a, 3b, 3
c and 3d may be integrated. Further, the second electrode may have a shape having two electron beam passage holes. Further, the second electrode may be formed in an L-shape having no electron beam passage hole, and a concave portion as a position regulating portion may be formed.

In the above embodiment, the horizontal correction plate constituting the electrostatic quadrupole lens of the electron gun has been described. However, the present invention is not limited to this, and the present invention is not limited to this. The present invention can be similarly applied to various types of electron gun assemblies integrally formed with plate-shaped or other shaped electrodes fixed near the passage hole.

[0058]

As described above, according to the present invention,
It is possible to precisely regulate the mutual position of multiple electrodes that affect the focusing characteristics of the plate-like electrode and horizontal correction plate, etc., which constitute the electrostatic quadrupole lens of the electron gun, and other electron beam focusing characteristics or convergence characteristics. A high-resolution color cathode ray tube can be obtained.

[Brief description of the drawings]

FIG. 1 shows a plate-shaped first electrode for forming an electrostatic quadrupole lens constituting an electron gun used in an embodiment of a color cathode ray tube according to the present invention, and a horizontal correction plate as a second electrode. FIG. 4 is an explanatory view of an electrode assembly in which is integrally fixed.

FIG. 2 is a developed perspective view showing the configuration of the electrode assembly shown in FIG. 1 in detail.

3 is an explanatory diagram of an assembly jig for positioning and welding the plate-like electrode and the horizontal correction plate shown in FIG. 2 with high precision.

FIG. 4 is an explanatory view showing a state in which a plate electrode and a horizontal correction plate are set on the assembly jig shown in FIG. 3;

FIG. 5 is a cross-sectional view taken along a tube axis for explaining the overall structure of the color cathode ray tube according to the present invention.

FIG. 6 is a schematic diagram showing a relationship between a horizontal deflection magnetic field of a pincushion magnetic field distribution and electron beam deflection.

FIG. 7 is an explanatory diagram of an electron beam spot shape on a screen.

FIG. 8 is a schematic cross-sectional view cut in a vertical direction along a tube axis for explaining an outline of a schematic structure example of an electron gun of a conventional color cathode ray tube for obtaining high resolution.

9 is an explanatory diagram of a main part of FIG. 8;

10 is an explanatory diagram of the operation of the electrostatic quadrupole lens shown in FIG.

FIG. 11 is a schematic diagram illustrating the structure of an assembly jig for fixing a horizontal correction plate to a plate-like electrode constituting an electrostatic quadrupole lens.

FIG. 12 is an explanatory view showing a state where the plate-like electrodes and the electron beam passage holes of the horizontal correction plate are inserted and positioned in the assembly jig shown in FIG. 11;

[Explanation of symbols]

1a, 1c Bases 2a, 2c of horizontal correction plate Electron beam passage holes 3a, 3b formed in bases 1a, 1c Horizontal correction plates 3c, 3d formed of electrode pieces obtained by bending both ends of base 1a in the horizontal direction 3c, 3d Horizontal ends of base 1c Horizontal correction plate 4 composed of bent electrode pieces 4 Plate-shaped electrodes 4a, 4b, 4c Electron beam passage holes 5a, 5b, 5c, 5d, 5a ', 5b', 5c ', 5 formed in plate-shaped electrode 4
d 'recess 6a, 6b, 6c, 6d, 7a, 7b, 7c, 7d Pin 11 Assembly jig 11a Board part of assembly jig.

Claims (3)

[Claims] A first electrode having a plate-like shape having an electron beam passage hole, an electron beam passage hole coaxial with the electron beam passage hole, and a plane parallel to a plane of the first electrode. A second electrode having an electrode piece cut and raised in a perpendicular direction and having three or less electron beam passage holes is formed on the second electrode, wherein the electron beam passage holes of the respective electrodes are coaxially located; A color cathode-ray tube provided with an electron gun having an electrode assembly formed by welding the above-mentioned electrode pieces so as to sandwich each of the electron beam passage holes from a horizontal direction, wherein a first electrode is provided at least at one or more corners of the first electrode. And a second portion corresponding to a notch of the first electrode of the second electrode.
The first electrode and the second electrode are integrally formed with the electron beam passage hole forming surface in a state where at least a part of the first and second position restriction portions substantially coincides in the tube axis direction. A color cathode ray tube characterized by being fixed in position. 2. A cathode for emitting three electron beams arranged in-line, and an electron gun having a control electrode, an accelerating electrode, a focusing electrode, and an anode arranged in the tube axis direction facing the cathode. The focusing electrode is divided into at least two along the tube axis direction, and the other one of the focusing electrodes is sandwiched from a vertical direction on a surface of one focusing electrode facing the other electrode. A pair of vertical correction plates extending parallel to the electrode direction is provided, and the three electron beams are sandwiched from a horizontal direction on a surface of the other focusing electrode facing the one focusing electrode. In a color cathode ray tube including an electron gun provided with two pairs of horizontal correction plates extending parallel to one focusing electrode direction, a surface of the other focusing electrode facing the one electrode includes:
It has a plate-like electrode having three electron beam passage holes corresponding to each of the three electron beams, and an electrode piece cut and raised in a direction perpendicular to the horizontal correction plate is provided for each of the three electron beams. A first position regulating portion formed at least at one or more corners of the plate-shaped electrode, formed by bending from a base having one or more electron beam passage holes formed coaxially or asymmetrically in accordance with A second position regulating unit corresponding to the first position regulating unit at a corner of a base of the horizontal correction plate,
The plate-shaped electrode and an electron beam passage hole forming surface of a horizontal correction plate are integrally fixed in a state where at least a part of the first position restricting portion and the second position restricting portion are substantially aligned in the tube axis direction. A color cathode ray tube characterized in that: 3. A concave portion formed on the outer edge of the plate-shaped electrode or the horizontal correction plate, or an opening formed near the outer edge, wherein one or both of the first position restricting portion and the second position restricting portion are formed. 3. The color cathode ray tube according to claim 1, wherein: