JPH10199443A - Cathode-ray tube device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To just focus electron beams over the entire area of an image screen. SOLUTION: In a first main lens electrode 8 and a second main lens electrode 9 of a DBF electron gun 20, center holes 8B and 9B of passing hole electrodes 8b and 9b are formed in an elliptic shape having a long diameter, and side holes 8A, 8C, 9A and 9C are formed in a composite ellipse on which an outside short radius is larger than an inside short radius, and a passing hole depth of the first main lens electrode 8 is also set smaller than a passing hole depth of the second main lens electrode 9, and three main lenses on which vertical directional lens strength is stronger than the horizontal direction are formed, and three electron beams are respectively just focused thereby over the whole area of an image screen, and the three electron beams can be concentrated on a single point. Since a focusing angle of a side electron beam on the horizontal directional outside of a side main lens becomes small, a comatic aberration of the side electron beam in a peripheral part of the image screen can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-line type electron gun having a dynamic quadrupole lens whose lens action changes in accordance with a screen scanning position, and a self-convergence having a static quadrupole lens having a constant lens action. The present invention relates to a cathode ray tube device provided with a mold deflection yoke.

[0002]

2. Description of the Related Art FIG. 5 is a simplified view of the horizontal and vertical lens functions of a conventional cathode ray tube device using an in-line type electron gun and a self-convergence type deflection device. The lens action when the beam is scanned at the center of the screen is shown, and FIG. 2B shows the lens action when the beam is scanned at the periphery of the screen. Three electron beams aligned in one horizontal plane, that is, a center electron beam and two side electron beams are emitted from three local portions of the in-line type electron gun 100. FIG. 5 shows a lens action on the center electron beam. Is shown. In FIG.
The upper half of the horizontal axis shows the lens action in the vertical direction (V),
The lower half shows the lens action in the horizontal direction (H). A lens for focusing the electron beam is indicated by a convex symbol, and a lens for diverging is indicated by a concave symbol.

An in-line type electron gun 100 has a quadrupole lens 101B for a center electron beam (a subscript B indicates a lens for the center electron beam, and a subscript c
(Shows the center part of the screen). A quadrupole lens forming electrode forming three quadrupole lenses including a center main lens 102B and a main lens forming electrode forming three main lenses including a center main lens 102B. The focusing and divergence of the electron beam are mainly controlled by the main lens. The above-mentioned quadrupole lens is a dynamic lens whose lens action changes according to the scanning position of the electron beam on the screen of the cathode ray tube. Hereinafter, this quadrupole lens is referred to as a DBF (Dynamic Beam Focusing) quadrupole lens. . A quadrupole lens forming electrode forming three DBF quadrupole lenses is called a composite DBF electrode, and a composite D
In the BF electrode, a partial electrode forming one DBF quadrupole lens is called a DBF electrode, and an in-line type electron gun provided with a composite DBF electrode is simply called a DBF electron gun.

FIG. 6 is a diagram showing the basic configuration of a DBF electrode. The DBF electrode shown in FIG. 6 includes four plate electrodes 61a, 61b, 62a, and 62b arranged in a box shape. The plate electrodes 61 a and 61 b having the same potential and arranged vertically and parallel constitute a DBF horizontal electrode 61. Further, the plate electrodes 62a and 62b of the same potential, which are arranged horizontally and parallel,
The vertical electrode 62 is formed. DBF horizontal electrode 61 and DBF
By applying a potential difference Vd to the vertical electrode 62, the DBF
A DBF quadrupole lens is formed in the electrode.

FIG. 7 is a view for explaining the lens action of the quadrupole lens on the electron beam. As shown in FIG. 7A, the quadrupole lens formed when the vertical electrode (DBF vertical electrode 62) is set to a higher potential than the horizontal electrode (DBF horizontal electrode 61) of the DFB electrode is the one shown in FIG. ),
A lens that converges the incident electron beam in the horizontal direction and diverges in the vertical direction. This DFB electrode
When an electron beam D having a circular cross section shown in FIG. 7A is incident, the cross section of the electron beam D passing through the DFB electrode becomes
As shown in FIG. 7C, the ellipse has a major axis in the vertical direction. As shown in FIG. 7D, a quadrupole lens formed when the vertical electrode is set to a lower potential than the horizontal electrode is
As shown in FIG. 7E, a lens that diverges the incident electron beam in the horizontal direction and converges it in the vertical direction. When the electron beam D having a circular cross section is incident on this DFB electrode, the cross section of the electron beam D passing through the DFB electrode is shown in FIG.
As shown in (f), the ellipse has a major axis in the horizontal direction.

Returning to FIG. 5, the self-convergence type deflection yoke 30 deflects three electron beams emitted from the DBF electron gun 100 and concentrates them at a predetermined scanning position on a screen 51 of a cathode ray tube. When beam scanning is performed on the screen peripheral portion 51e, a lens (hereinafter, referred to as an obstruction lens) 32e due to a convergence magnetic field is used.
(A suffix e indicates the time of scanning the periphery of the screen), and a quadrupole lens forming coil for forming a quadrupole lens 31 for reducing the lens action of the obstruction lens 32e is provided. The quadrupole lens 31 is a static lens having a constant lens action that becomes a focusing system in the horizontal direction and a diverging system in the vertical direction regardless of the beam scanning position on the screen 51. SBF
(Static Beam Focusing) This is called a 4-pole lens. The above-mentioned quadrupole lens forming coil is called an SBF coil,
A self-convergence type deflection yoke provided with a BF coil is simply called an SBF deflection yoke.

FIG. 8 is a schematic configuration diagram of an SBF coil.
As shown in FIG. 8, the SBF coil includes two quadrupole electromagnet coils 41 wound around a core 43 of the SBF deflection yoke 30.
And 42. The quadrupole electromagnet coil 41 includes the core 4
3 is wound so as to be wider on the neck side (FIG. 8).
(A)) Also, the quadrupole electromagnet coil 42 is wound so as to be wider on the screen side (FIG. 8 (b)). 4
The SBF quadrupole lens 31 is formed by driving the polar electromagnet coils 41 and 42 with direct current.

Returning to FIG. 5, the main lens 102B is a lens having the same focusing intensity in both the horizontal and vertical directions of the incident electron beam, and this focusing intensity is determined by the beam scanning position, that is, from the DBF electron gun 100 to the screen 51. This is a dynamic lens that changes according to the distance to the lens. FIG.
In the beam scanning of the periphery of the screen shown in (b), as described above, a disturbing lens 32e that becomes a divergent system in the horizontal direction and a focusing system in the vertical direction is formed. At this time, the combined lens of the disturbing lens 32e and the SBF quadrupole lens 31 has a lens function of diverging in the horizontal direction and converging in the vertical direction. Accordingly, the DBF quadrupole lens 101Be has a lens function of focusing in the horizontal direction and a lens function of diverging in the vertical direction, thereby canceling the above-described combined lens action, and weakening the focusing lens strength of the main lens 102Be to reduce the intensity of the focusing lens at the screen peripheral portion 51e. The electron beam is focused just in the horizontal and vertical directions.

On the other hand, in the beam scanning at the center of the screen shown in FIG. 5A, the obstruction lens 32c is not formed, and therefore, the DBF quadrupole lens 101Bc (subscript c indicates the time of scanning the center of the screen). Diverging in the vertical direction and converging in the vertical direction, canceling the lens effect of the SBF quadrupole lens 31, strengthening the converging lens strength of the main lens 102Bc, and converting the electron beam horizontally and vertically on the screen central portion 51c. Just focus in both directions. Note that the lens action on the side electron beam is the same as in FIG. However, the beam center axis of the side electron beam does not pass through the lens center of the SBF quadrupole lens 31 but passes through a position shifted in the horizontal direction.

[0010]

However, FIG.
In the central part of the screen shown in FIG. 9A, in order to cancel the lens effect of the SBF quadrupole lens 31, the DBF quadrupole lens 101Bc must have a strong diverging / focusing action. In this case, the cross-sectional shape of the electron beam incident on the main lens 102Bc is an ellipse having a major axis in the horizontal direction and is considerably flattened, and the cross-sectional shape of the electron beam on the screen central portion 51c is an ellipse long in the vertical direction. turn into. If the focusing and diverging effects of the SBF quadrupole lens 31 are set weak to avoid this, FIG.
In the peripheral portion of the screen shown in FIG.
e must have a strong focusing and diverging effect, and the cross-sectional shape of the electron beam on the screen peripheral portion 51e becomes an ellipse that is long in the horizontal direction. That is, there has been a problem that the cross-sectional shape of the electron beam cannot be kept circular over the entire screen. Also, in the peripheral portion of the screen shown in FIG. 5B, there is a problem that the coma of the side electron beam on the peripheral portion 51e of the screen becomes large. 5A and 5B, DBF
There is also a problem that both side electron beams from the electron gun 100 are bent inward, that is, toward the center electron beam side.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a cathode ray tube device capable of just-focusing and converging three electron beams over the entire screen. With the goal.

[0012]

In order to achieve the above object, a cathode ray device according to the present invention comprises: a triode portion for radiating two side electron beams and a center electron beam located between them to a horizontal plane; Dynamic 4 for each of the electron beams
An in-line type electron having a quadrupole lens forming electrode forming a pole lens, and a main lens forming electrode forming a center main lens for focusing the center electron beam and two side main lenses for focusing the side electron beams respectively. A self-convergence type deflection yoke having a quadrupole lens forming coil for forming a static quadrupole lens having a predetermined lens strength with respect to three electron beams from the in-line type electron gun. In the cathode ray tube device, the three main lenses formed by the main lens forming electrodes have different lens intensities in the horizontal and vertical directions, and the convergence magnetic field of the self-convergence type deflection yoke exerts a converging / diverging effect on the electron beam. Is corrected in cooperation with the static quadrupole lens and the dynamic quadrupole lens. And wherein the door.

According to a second aspect of the present invention, in the inter-cathode line device, the quadrupole lens forming coil forms a static quadrupole lens having a lens function of a focusing system in a horizontal direction and a diverging system in a vertical direction,
The three main lenses formed by the main lens forming electrodes have a higher lens strength in the vertical direction than in the horizontal direction.

According to a third aspect of the present invention, there is provided the inter-cathode line device according to the second aspect.
In the above, the two side main lenses formed by the main lens forming electrodes have a lower outer horizontal lens strength than an inner horizontal lens strength corresponding to the center main lens.

According to a fourth aspect of the present invention, in the inter-cathode line device, the main lens forming electrode includes a first main lens electrode and a second main lens electrode, and each of the first main lens electrode and the second main lens electrode. However, two side holes for passing the side electron beams and a center hole for passing the center electron beam located between the two side holes are formed inside an elliptical cylindrical electrode having one end as a head portion. Provided in the form of a plate-shaped passage hole electrode, wherein the first main lens electrode and the second main lens electrode are arranged with respect to the three-pole portion.
The first main lens electrode is on the near side, the second main lens electrode is on the far side, and the two head portions are disposed so as to face each other at a predetermined interval. The shape of the side hole and the center hole of the second main lens electrode is an ellipse or a compound ellipse, respectively, and the distance from the head portion of the first main lens electrode to the passage hole electrode and the distance from the head portion of the second main lens electrode. The distance to the through-hole electrode is different.

According to a fifth aspect of the present invention, in the fourth aspect, the side hole and the center hole of the first main lens electrode and the second main lens electrode are each formed of an ellipse having a minor diameter in a horizontal direction or a horizontal direction. Are complex ellipses having different minor radii, and the distance from the head of the first main lens electrode to the through-hole electrode is smaller than the distance from the head of the second main lens electrode to the through-hole electrode. Features.

According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the side holes of the first main lens electrode and the second main lens electrode have the same major axis in the vertical direction and the major axis in the horizontal direction. It is a composite elliptical shape having a minor axis composed of a minor radius, and its outer minor radius is larger than the inner minor radius and equal to or less than the major radius.

[0018]

FIG. 1 is a horizontal sectional view of a cathode ray tube device according to an embodiment of the present invention. The cathode ray tube device shown in FIG. 1 includes a cathode ray tube 50, a DBF electron gun 20 provided inside the neck of the cathode ray tube 50, and an SBF deflection yoke 30 provided outside the cathode ray tube 50. Center electron beam 71 emitted from DBF electron gun 20 to a horizontal plane
B and the side electron beams 71A and 71C are deflected by the SBF deflection yoke 30, and are deflected by the screen 5 of the cathode ray tube 50.
1 is scanned over. The SBF deflection yoke 30 is provided on an annular core 43 disposed so as to surround the cathode ray tube 50,
Horizontal deflection coil 44, vertical deflection coil 45, SBF
Quadrupole electromagnet coils 41 and 42 constituting coil 46
(See FIG. 8).

FIG. 2 is a horizontal sectional view of the DBF electron gun 20. The DBF electron gun 20 includes cathode electrodes 1A,
B, 1C, control electrode 2, acceleration electrode 3, pre-focusing electrodes 4, 5, composite DBF horizontal electrode 6, composite DBF vertical electrode 7, first main lens electrode 8, second main lens electrode 9
And a shield cup 10. The three cathode electrodes 1A, 1B, and 1C are arranged in a horizontal straight line, and each emit an electron beam. The cathode electrode 1B arranged at the center emits a center electron beam 71B, and the cathode electrodes 1A and 1C arranged at both ends emit side electron beams 71A and 71C, respectively. The control electrode 2 controls the extraction amount of the electron beam emitted from the cathode electrodes 1A, 1B, and 1C, respectively. The accelerating electrode 3 is the control electrode 2
The electron beams that have passed through are accelerated. The cathode electrodes 1A, 1B, and 1C, the control electrode 2, and the accelerating electrode 3 form a triode 11. Also, the pre-focusing electrodes 4 and 5
Pre-focuses the electron beams from the accelerating electrodes 3 respectively. The composite DBF horizontal electrode 6 and the composite DBF vertical electrode 7 constitute a composite DBF electrode 12. This composite DB
The F electrode 12 is a composite electrode having three DBF electrodes, and includes a center electron beam 71B and a side electron beam 7B.
Three DBF quadrupole lenses respectively corresponding to 1A and 71C are formed.

First main lens electrode 8 and second main lens electrode 9
Constitutes the main lens forming electrode 13. The main lens forming electrode 13 includes a center main lens for focusing the center electron beam 71B and side electron beams 71A and 71C.
Are formed to form two side main lenses. The main lens is formed between the opposing main lens electrodes 8 and 9. The first main lens electrode 8 has an elliptical through-hole electrode 8b provided inside an elliptical cylindrical electrode 8a having one end portion as a head portion 8c, and a second main lens. The electrode 9 has an elliptical through-hole electrode 9b provided inside an oval cylindrical electrode 9a having one end portion as a head portion 9c. Electrode beam passage holes 8A, 8B, 8C and 9A, 9B, 9C are provided in the passage hole electrodes 8b and 9b, respectively, in a horizontal straight line. Here, 8B, 9B
Is a center hole through which the center electron beam 71B passes. 8A, 8C, 9A, and 9C are side holes through which the side electron beams 71A and 71C pass. The first main lens electrode 8 and the second main lens electrode 9 are arranged such that the first main lens electrode 8 is on the near side and the second main lens electrode 9 is on the far side with respect to the triode portion 11. 8c and 9c are arranged to face each other at a predetermined interval. The first main lens electrode 8 is at the same potential as the composite DBF vertical electrode 7. The shield cup 10 has the same potential as the second main lens electrode 9 and has a function of protecting the electron beam from the leakage magnetic field of the deflection yoke.

FIG. 3 is a detailed explanatory view of the above-mentioned through-hole electrodes 8b and 9b. FIG.
8B and 8C, (b) is a shape diagram of the through holes 9A, 9B and 9C of the through hole electrode 9b, and (c) is a shape diagram of the through hole electrode 8b.
9b shows a horizontal sectional view near 9b. FIG. 3 (a),
The dimension L from the center hole center to the side hole center shown in (b) is called the pitch of the in-line type electron gun, and in this embodiment, L = 4.7 [mm].

3 (a) and 3 (b), the center hole 8
B and 9B are elliptical shapes having a minor axis in the horizontal direction and a major axis in the vertical direction. The center hole 8B has a short radius a
= 2.1 [mm] and a major radius b = 3.1 [mm], and a center hole 9B opposed to the ellipse has a minor radius f =
This is an ellipse having 2.08 [mm] and a major radius g = 2.615 [mm]. Also, the side holes 8A, 8C, 9A, 9C
Is a compound elliptical shape having a major axis of a major radius equal to the vertical direction and a minor axis composed of minor axes different in the horizontal direction, the outer minor radius of which is larger than the inner minor radius of the center hole side, and It is less than the long radius. The side holes 8A and 8C of the passage hole electrode 8b have an inner short radius c = 2.165 [m
m], outer minor radius d = 2.61 [mm], major radius e =
This is a composite ellipse having 3.1 [mm]. In addition, the side holes 9A and 9C of the through-hole electrode 9a opposed thereto have an inner minor radius h = 2.155 [mm] and an outer minor radius i = 3.1 [m].
m] and a major axis j = 3.1 [mm], and is a compound ellipse with a semi-ellipse inside and a semi-circle outside.

Further, dimensions s and t shown in FIG.
Is referred to as a through hole depth. In this embodiment, the through hole depth s of the first main lens electrode 8 is 2.5 mm, and the through hole depth t of the second main lens electrode 9 is 2. 57 [mm]. That is, the depth s of the passage hole of the first main lens electrode 8
Is set to a value smaller than the passage hole depth t of the second main lens electrode 9. When the dimension u shown in FIG. 3C is subtracted, the distance from the head portion 8c of the first main lens electrode 8 to the through hole electrode 8b is changed from the head portion 9c of the second main lens electrode 9 to the through hole electrode. This means that the distance is set to a value smaller than the distance to 9b. As described above, the DBF electron gun 20 includes the through holes 8A, 8B, 8 of the through hole electrodes 8b, 9b.
By making C, 9A, 9B, 9C elliptical with a major axis in the vertical direction, and making the through hole depth s of the first main lens electrode 8 smaller than the through hole depth t of the second main lens electrode 9, The three main lenses formed by the first main lens electrode 8 and the second main lens electrode 9 are lenses whose lens strength in the vertical direction is stronger than that in the horizontal direction. Further, by making the side holes 8A, 8C, 9A, 9C into a composite ellipse having an outer minor radius larger than the inner minor radius, the two side main lenses are made lenses whose horizontal outer lens strength is weaker than the inner lens. The refraction angles (convergence angles) of the side electron beams 71A and 71C on the outer side in the horizontal direction of the main lens are reduced, and the beam trajectory is expanded outward.

FIGS. 4A and 4B schematically show the horizontal and vertical lens operations in the cathode ray tube apparatus according to the embodiment of the present invention. FIG. 4A shows a lens when a beam is scanned at the center of the screen. (B) shows a lens operation when a beam is scanned around the periphery of the screen. From the three local portions 11 of the in-line type electron gun 20, a center electron beam 71B and two side electron beams 71 arranged in a horizontal plane are provided.
A and 71C are radiated. FIG. 4 shows the lens action on the center electron beam 71B. In FIG. 4, the upper half of the horizontal axis shows the lens action in the vertical direction (V), and the lower half shows the lens action in the horizontal direction (H).

In the in-line type electron gun 20, the center electron beam 71B becomes a diverging system in the horizontal direction and a focusing system in the vertical direction by the composite DBF electrode 12, or a focusing system in the horizontal direction and a diverging system in the vertical direction. DBF quadrupole lens 21B (subscript B indicates a lens for the center electron beam, subscript c in the figure indicates the center of the screen, and e indicates the periphery of the screen), and a main lens forming electrode 13, a center main lens 22B having a weaker focusing lens strength in the horizontal direction than in the vertical direction is formed.
In the SBF deflection yoke 30, the SBF coil 46 uses the SBF coil 46 to form a focusing system in the horizontal direction and a diverging system in the vertical direction for the three electron beams emitted from the DBF electron gun 20, including the center electron beam 71B. Lens 31
Are formed, and a convergence magnetic field forms a disturbing lens 32e in the peripheral portion of the screen in FIG. 4B.

In FIG. 4B, there is a disturbing lens 32e of the SBF deflection yoke 30, which serves as a diverging system in the horizontal direction and a focusing system in the vertical direction.
The composite lens with the polar lens 31 has a lens function of diverging in the horizontal direction and converging in the vertical direction. In this case, DBF4
The polar lens 21Be has a lens function of converging in the horizontal direction and a lens function of diverging in the vertical direction to cancel the above-described combined lens effect, and also weakens the converging lens strength of the center main lens 22Be, thereby allowing the electron beam on the screen peripheral portion 51e. Just focus both horizontally and vertically. The difference between the horizontal and vertical focusing lens intensities of the center main lens 22Be is compensated by the DBF quadrupole lens 21Be.

On the other hand, in FIG. 4A, there is no obstruction lens 32c due to the convergence magnetic field, and only the SBF quadrupole lens 31 is formed on the SBF deflection yoke 30. In this case, the lens function of the SBF quadrupole lens 31 is a DBF quadrupole lens 21Bc having a diverging function in the horizontal direction and a converging function in the vertical direction, and a center having a weaker converging lens strength in the horizontal direction than in the vertical direction. Main lens 22
Bc, and the intensity of the focusing lens of the center main lens 22Bc is made stronger than that at the time of scanning the peripheral portion of the screen shown in FIG. As described above, the lens action of the SBF quadrupole lens 31 is not limited to the DBF quadrupole lens 21Bc,
Since the DBF quadrupole lens 21Bc does not need to have a strong divergence and focusing action by canceling out by the quadrupole lens 21Bc and the center main lens 22Bc, the electron beam is just focused in the horizontal and vertical directions at the screen center 51c. And the cross-sectional shape of the electron beam can be made substantially circular. The lens action on the side electron beams 71A and 71C is the same as that in FIG. 4 except for the side main lens. The two side main lenses have lower horizontal lens intensities than the inner side, and preliminarily expand the beam trajectories of the side electron beams 71A and 71C outward in the horizontal direction as shown in FIG. This compensates that the beam trajectories of the side electron beams 71A and 71C are bent inward in the horizontal direction by the SBF quadrupole lens 31.

As described above, according to the above embodiment, the DB
In the first main lens electrode 8 and the second main lens electrode 9 of the F electron gun 20, the through holes 8A, 8b of the through hole electrodes 8b, 9b are provided.
B, 8C, 9A, 9B, and 9C are each formed into an elliptical shape having a major axis in the vertical direction, and the depth s of the passage hole of the first main lens electrode 8 is set to the second.
By making the through-hole depth t of the main lens electrode 9 smaller, the three main lenses are lenses whose vertical lens intensities are stronger than those in the horizontal direction. Just focus,
In addition, three electron beams can be concentrated at one point. Further, by making the side holes 8A, 8C, 9A, 9C into a composite ellipse having an outer minor radius larger than the inner minor radius, the two side main lenses are made lenses whose horizontal outer lens strength is weaker than the inner lens. It is possible to reduce the refraction angles of the side electron beams 71A and 71C in the horizontal outer side of the main lens and widen the beam trajectory, thereby compensating in advance that the side electron beam is bent inward by the SBF quadrupole lens 31. Thus, coma of the side electron beam in the peripheral portion of the screen can be reduced.

[0029]

As described above, according to the cathode ray tube device of the first and fourth aspects of the present invention, the focusing lens in the horizontal and vertical directions of the main lens is formed by the main lens forming electrode of the in-line type electron gun. By forming the main lens having different intensities, the electron beam can be just focused on a good beam spot close to a perfect circle over the entire screen without flattening the electron beam by the DBF quadrupole lens. There is.

According to the cathode ray tube device of the second and fifth aspects, the SBF formed inside the SBF deflection yoke
When the quadrupole lens has a converging action in the horizontal direction and a diverging action in the vertical direction, the same effect as described above is obtained.

According to the cathode ray tube device of the third and sixth aspects, the amount of refraction of the side electron beam in the side main lens can be reduced, so that the side electron beam is bent inward by the SBF quadrupole lens. Compensation can be made in advance, and coma of the side electron beam in the peripheral portion of the screen can be reduced.

[Brief description of the drawings]

FIG. 1 is a horizontal sectional view showing a schematic configuration of a cathode ray tube device according to an embodiment of the present invention.

FIG. 2 is a horizontal sectional view showing a detailed structure of a DBF electron gun according to the embodiment of the present invention.

FIG. 3 is a diagram showing a detailed structure of a through-hole electrode of the DBF electron gun according to the embodiment of the present invention.

FIG. 4 is a diagram illustrating a lens function in the cathode ray tube device according to the embodiment of the present invention.

FIG. 5 is a diagram showing a lens function in a conventional cathode ray tube device.

FIG. 6 is a diagram showing the basic configuration of a DBF electrode.

FIG. 7 is a diagram illustrating a lens function in a quadrupole lens.

FIG. 8 is a schematic structural diagram of an SBF coil.

[Explanation of symbols]

1A, 1B, 1C cathode electrode, 2 control electrode,
3 Accelerating electrode, 4, 5 Pre-focusing electrode, 6 Composite D
BF horizontal electrode, 7 composite DBF vertical electrode, 8 first main lens electrode, 9 second main lens electrode, 8a, 9a
Cylindrical electrode, 8b, 9b through-hole electrode, 8c, 9c head, 8B, 9B center hole, 8A, 8C, 9A,
9C side hole, 10 shield cup, 113
Pole part, 12 composite DBF electrode, 13 main lens forming electrode, 20 DBF electron gun, 30 SBF deflection yoke, 41, 42 quadrupole electromagnet coil, 43 core,
44 horizontal deflection coils, 45 vertical deflection coils,
46 SBF coil, 50 cathode ray tube, 51 screen

Claims (6)

[Claims] 1. A three-pole part for radiating two side electron beams and a center electron beam located between them to a horizontal plane, and a quadrupole lens forming a dynamic quadrupole lens for each of the electron beams. A forming electrode, and a main lens forming electrode forming a center main lens for converging the center electron beam and two side main lenses for converging the side electron beams, respectively, and the inline type electron gun; A cathode ray tube device provided with a self-convergence type deflection yoke having a quadrupole lens forming coil for forming a static quadrupole lens having a predetermined lens strength with respect to three electron beams from the type electron gun; The three main lenses formed by the lens forming electrodes have different lens strengths in the horizontal and vertical directions, and the Cathode-ray tube apparatus in which convergence magnetic field of Zensu type deflection yoke, characterized in that the focusing diverging action on the electron beam is corrected in cooperation with the static quadrupole lens and the dynamic quadrupole lens. 2. The quadrupole lens forming coil forms a static quadrupole lens having a lens function of a focusing system in a horizontal direction and a diverging system in a vertical direction, and is formed by the main lens forming electrode. 2. The cathode ray tube device according to claim 1, wherein the two main lenses have a higher lens strength in a vertical direction than in a horizontal direction. 3. The two side main lenses formed by the main lens forming electrodes, wherein the outer horizontal lens strength is lower than the inner horizontal lens strength corresponding to the center main lens side. The cathode ray tube device according to claim 2. 4. The main lens forming electrode includes a first main lens electrode and a second main lens electrode, and each of the first main lens electrode and the second main lens electrode has one end thereof as a head. A plate-shaped through-hole electrode in which two side holes for passing the side electron beams and a center hole for passing the center electron beam located between the two side holes are formed inside an elliptical cylindrical electrode serving as a portion. Wherein the first main lens electrode and the second main lens electrode are closer to the triode portion than the first main lens electrode is,
A second main lens electrode is located on a far side, and the two head portions are arranged so as to face each other with a predetermined interval, and a side hole and a center hole shape of the first main lens electrode and the second main lens electrode are provided. Are ellipses or compound ellipses, respectively, and the distance from the head of the first main lens electrode to the through-hole electrode is different from the distance from the head of the second main lens electrode to the through-hole electrode. The cathode ray tube device according to claim 1, wherein: 5. The side holes and center hole shapes of the first main lens electrode and the second main lens electrode are ellipses each having a minor axis in the horizontal direction or a composite ellipse having minor axes in the horizontal direction, respectively. 5. The cathode ray tube device according to claim 4, wherein a distance from a head portion of the first main lens electrode to the passage hole electrode is smaller than a distance from a head portion of the second main lens electrode to the passage hole electrode. 6. The compound elliptical shape in which the side holes of the first main lens electrode and the second main lens electrode have a major axis having a major axis equal to the vertical direction and a minor axis having minor axes different in the horizontal direction. The outer minor radius is greater than the inner minor radius and less than or equal to the major radius.
The cathode ray tube device as described in the above.