JP2003016962A - Color picture tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To acquire uniform resolving performance over the whole region of a screen by realizing almost completely round beam spots at the center and peripheral part of the screen in a color picture tube using an inline self- convergence system. SOLUTION: This color picture tube is provided with an electron gun having three cathodes 1a-c inline-arranged in the horizontal direction, a control electrode 2, an accelerating electrode 3, a focusing electrode system and an anode. The focusing electrode system comprises a pair of focusing electrodes with opposed faces formed with noncircular electron beam through holes. A prescribed focus voltage is applied to the first focusing electrode 6, and voltage changed according to the deflection angle of electron beams is applied to the second focusing electrode 7. The control electrode 2 is provided with noncircular electron beam through holes longitudinal in the vertical direction. An addition electrode 4 is provided between the accelerating electrode 3 and the first focusing electrode 6, and voltage changed according to the deflection angle of the electron beams is applied thereto.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color picture tube constructed so that uniform resolution performance can be obtained over the entire area of a phosphor screen surface.

[0002]

2. Description of the Related Art In an in-line color picture tube device in which three electron beam emitting portions are arranged in a straight line in the horizontal direction, a magnetic field for deflecting the electron beam is distorted horizontally in a pincushion shape and vertically in a barrel shape. As a result, the three electron beams are automatically focused on the entire phosphor screen.

However, this magnetic field causes excessive focusing of the electron beam in the vertical direction at the peripheral portion of the phosphor screen to cause defocusing, resulting in a problem of deterioration in resolution. JP-A-9-2
Japanese Patent No. 23469 discloses one means for solving this problem.

FIG. 1 shows a conventional electron gun structure. Three cathodes 1a, 1b, 1 arranged in a straight line in the horizontal direction
An in-line electron gun is composed of the control electrode 2, the control electrode 2, the acceleration electrode 3, and the three electrodes forming the focusing electrode system, that is, the first focusing electrode 6, the second focusing electrode 7, and the final acceleration electrode (anode) 8. Has been done.

As shown in FIG. 2, the control electrode 2 is provided with non-circular (rectangular) electron beam passage holes 2a, 2b, 2c so that their longitudinal directions are along the vertical direction (that is,
It is arranged vertically. Vertically long non-circular (rectangular) electron beam passage holes 6d, 6e, 6f are provided on the end surface of the first focusing electrode 6 on the second focusing electrode 7 side. Second focusing electrode 7
The non-circular (rectangular) electron beam passage holes 7a, 7b, 7c provided on the end face of the first focusing electrode 6 side are arranged so that their longitudinal directions are along the horizontal direction (that is, horizontally long). As described above, the electron beam passage holes of the first focusing electrode 6 and the second focusing electrode 7 have a structure which is non-axisymmetric with respect to the beam axis.

A constant focus voltage Vfoc is applied to the first focusing electrode 6, and a dynamic voltage 9 rising with the increase of the deflection angle of the electron beam is superimposed on the focus voltage Vfoc for the second focusing electrode 7. Is applied.

When a dynamic voltage is applied, a potential difference occurs between the first focusing electrode 6 and the second focusing electrode 7 to form a quadrupole lens, and at the same time, the second focusing electrode 7 and the final accelerating electrode are formed. 8 and the potential difference becomes small and the main lens weakens. The generation of the quadrupole lens cancels vertical overfocusing due to the distorted magnetic field, and at the same time, the main lens is weakened to correct defocusing due to the increase in the distance to the fluorescent screen during deflection. Focusing of the electron beam at the peripheral portion is improved.

By changing the hole shape of the control electrode 2 from a perfect circle shape to a vertically elongated shape, the hole diameter in the horizontal direction is small, so that the operating area of the cathode is small and the current density is large. Diameter) becomes smaller. On the contrary, since the electron beam passage hole of the control electrode 2 is large in the vertical direction, the object point diameter (crossover diameter) becomes large. Since the beam spot is formed by focusing the object point on the fluorescent screen by the lens action, the spot becomes small in the horizontal direction and becomes large in the vertical direction. The shape of the beam spot is slightly elongated at the center of the screen, but the horizontal elliptical distortion of the peripheral spots can be improved (however, it does not reach a perfect circle).

[0009]

When the hole shape of the control electrode is changed from a perfect circle shape to a vertically elongated shape, the oblong elliptic distortion of the beam spot at the peripheral portion can be improved to some extent, but it can be improved to a perfect circle beam spot. Not up to. Further, when the picture tube is flattened and the deflection angle becomes large, the lateral elliptic distortion becomes more remarkable. Therefore, it can be said that the effect of improving the lateral elliptic distortion is sufficient only by making the hole shape of the control electrode elongated. Absent. Further, the shape of the beam spot is vertically long at the center of the screen, which is insufficient in terms of uniformity of the beam spot over the entire screen.

The present invention provides a color picture tube which realizes a substantially perfect circular beam spot at the center and peripheral portions of the screen and can obtain uniform resolution performance over the entire screen. To aim.

[0011]

A color picture tube according to the present invention comprises an electron gun having three cathodes, a control electrode, an accelerating electrode, a focusing electrode system and an anode, which are horizontally arranged in-line. The control electrode has a non-circular electron beam passage hole which is vertically long. The focusing electrode system includes a first focusing electrode to which a predetermined focus voltage is applied and a second focusing electrode to which a voltage that changes according to the deflection angle of the electron beam is applied. The first focusing electrode and the second focusing electrode have a non-circular electron beam passage hole. An additional electrode is provided between the accelerating electrode and the first focusing electrode, and the voltage applied to the additional electrode is the voltage of the accelerating electrode when the electron beam scans the central portion of the screen. The voltage is equal to or lower than the voltage of the accelerating electrode, and the applied voltage gradually increases as the scanning position of the electron beam moves toward the peripheral portion of the screen with the voltage as a base point.

Preferably, the ratio (Dv / Dh) of the vertical passage hole diameter (Dv) of the non-circular electron beam passage hole of the control electrode to the horizontal passage hole diameter (Dh) is in the range of 1.3 to 2.0. There is a configuration in.

Further, it is preferable that the vertical lens effective diameter of the main lens formed by the second focusing electrode and the anode is larger than the horizontal lens effective diameter.

Other constructions of the color picture tube according to the present invention also include
An electron gun having three cathodes, a control electrode, an accelerating electrode, a focusing electrode system and an anode, which are arranged in-line in the horizontal direction, is provided. The control electrode has a non-circular electron beam passage hole which is vertically long. The focusing electrode system includes a first focusing electrode to which a predetermined focus electrode is applied and a second focusing electrode to which a voltage that changes according to the deflection angle of the electron beam is applied. The first focusing electrode and the second focusing electrode have a non-circular electron beam passage hole. An additional electrode is provided between the accelerating electrode and the first focusing electrode, and the voltage applied to the additional electrode is the voltage of the accelerating electrode when the electron beam scans the central portion of the screen. Equal to or
Alternatively, the voltage is lower than the voltage of the accelerating electrode, and the applied voltage gradually increases as the scanning position of the electron beam moves toward the peripheral portion of the screen with the voltage as a base point. A first auxiliary electrode and a second auxiliary electrode are provided between the additional electrode and the first focusing electrode, and the first focusing electrode and the first auxiliary electrode are connected by a conductor.
The focusing electrode and the second auxiliary electrode are connected by a conductor.

In this structure, preferably, the longitudinal direction of the non-circular electron beam passage hole formed on the surface of the first focusing electrode facing the second auxiliary electrode is horizontal, and the non-circular electron beam passage hole is horizontal. The longitudinal direction of the non-circular electron beam passage hole formed on the surface facing the first focusing electrode is vertical.

Further preferably, the ratio (Dv / Dh) of the vertical passage hole diameter (Dv) and the horizontal passage hole diameter (Dh) of the non-circular electron beam passage hole of the control electrode is 1.3 to 2.
The configuration is in the range of 0.

Further, it is preferable that the main lens formed by the second focusing electrode and the anode has a vertical lens effective diameter larger than a horizontal lens effective diameter.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) FIG. 3 shows an electron gun of a color picture tube according to the first embodiment of the present invention.
As shown in FIG. 3, 3 arranged in a straight line in the horizontal direction
Individual cathodes 1a, 1b, 1c, control electrode 2, acceleration electrode 3,
The additional electrode 4 and the three electrodes forming the focusing electrode system, that is, the first focusing electrode 6, the second focusing electrode 7, and the final accelerating electrode 8.
The in-line type electron gun is constituted by.

The control electrode 2 is provided with non-circular (rectangular) electron beam passage holes 2a, 2b and 2c, and their longitudinal directions are along the vertical direction (that is, they are vertically long). The vertical hole diameter (Dv) and the horizontal hole diameter (D
By setting the ratio of h) and Dv / Dh in the range of 1.3 to 2.0, the operational effects described below are most effective.

At the end surface of the first focusing electrode 6 on the second focusing electrode 7 side, vertically long non-circular (rectangular) electron beam passage holes 6d, 6 are provided.
e, 6f are provided. The non-circular (rectangular) electron beam passage holes 7a, 7b, 7c provided on the end surface of the second focusing electrode 7 on the side of the first focusing electrode 6 are arranged such that their longitudinal directions are along the horizontal direction (that is, horizontally long). Has been done. As described above, the electron beam passage portions of the first focusing electrode 6 and the second focusing electrode 7 have a structure which is non-axisymmetric with respect to the beam axis.

A constant focus voltage Vfoc is applied to the first focusing electrode 6, and a dynamic voltage 9 that rises as the deflection angle of the electron beam increases is superimposed on the focus voltage Vfoc on the second focusing electrode 7. Is applied. When the dynamic voltage 9 is applied, a potential difference occurs between the first focusing electrode 6 and the second focusing electrode 7 to form a quadrupole lens, and at the same time, the second focusing electrode 7 and the final accelerating electrode 8 are formed. And the potential difference between them becomes smaller and the main lens becomes weaker.

The generation of the quadrupole lens cancels vertical overfocusing due to the distorted magnetic field, and at the same time, the main lens is weakened to correct defocusing due to expansion of the distance to the fluorescent screen during deflection. Therefore, the focusing of the electron beam on the peripheral portion of the phosphor screen is improved.

Further, a dynamic voltage 10 that changes according to the deflection angle of the electron beam is applied to the additional electrode 4 provided between the acceleration electrode 3 and the first focusing electrode 6. The dynamic voltage 10 is a voltage different from the dynamic voltage 9 applied to the second focusing electrode 7.

FIG. 4 shows an example of the dynamic voltage (Vs) applied to the additional electrode 4. At the center of the screen, the additional electrode 4 is equal to the acceleration voltage (Vg2) or Vg
A voltage lower than 2 is applied. The applied voltage gradually increases as the deflection angle increases.

To make the slightly elongated beam spot substantially circular in the center of the screen means that the beam after passing through the prefocus lens formed by the acceleration electrode 3, the additional electrode 4 and the first focusing electrode 6 is formed. It becomes possible by making the shape more vertically long.

FIG. 5 shows the behavior of the electron beam at the center of the screen. 5A shows the behavior of the electron beam 12 in the horizontal direction, and FIG. 5B shows the behavior of the electron beam 12 in the vertical direction. In this case, since the dynamic voltage (Vs) applied to the additional electrode 4 is small, the prefocus lens 13 is strong. Therefore, in the horizontal direction, as shown in FIG.
As the angle θ1 of light incident on the screen 15 decreases, the lens magnification in the horizontal direction increases and the beam spot diameter in the horizontal direction increases. Further, in the vertical direction, as shown in FIG. 5B, as the angle θ2 of incidence from the main lens 13 to the screen 15 increases, the vertical lens magnification decreases and the vertical beam spot diameter decreases. It will decrease. Therefore, the shape of the beam spot at the center of the screen can be corrected from a slightly vertically long shape to an almost perfect circle.

On the other hand, the slightly oblong beam spot in the peripheral portion of the screen can be formed into a substantially circular shape by making the beam diameter after passing through the prefocus lens 13 more oblong.

FIG. 6 shows the behavior of the electron beam in the peripheral portion of the screen. 6A shows the behavior of the electron beam 12 in the horizontal direction, and FIG. 6B shows the behavior of the electron beam 12 in the vertical direction. In this case, since the dynamic voltage (Vs) applied to the additional electrode 4 is large, the prefocus lens 13 is weak. Therefore, in the horizontal direction, as shown in FIG.
6, the angle θ3 of light incident on the screen 15 from the main lens 14 increases, the lens magnification in the horizontal direction decreases, and the beam spot diameter in the horizontal direction decreases. Further, in the vertical direction, as shown in FIG. 6B, the angle θ from the main lens 14 to the screen 15 is incident.
4 becomes small, the vertical lens magnification becomes large,
This is the direction in which the beam spot diameter in the vertical direction increases. Therefore, it is possible to correct the shape of the beam spot in the peripheral portion of the screen from a slightly oblong shape to a substantially circular shape.

The beam diameter shape after passing through the prefocus lens 13 is changed according to the deflection angle of the electron beam 12 (the beam diameter shape is made vertically long at the center of the screen and horizontally long at the periphery of the screen). By doing so,
An almost circular beam spot can be obtained.

In this embodiment, the vertical hole diameter (Dv) and the horizontal hole diameter (D) of the vertically long non-circular electron beam passage hole of the control electrode 2 are used.
By increasing the ratio of h), the difference in the cathode lens action in the horizontal direction and the vertical direction is increased. That is, the cathode lens action is stronger in the horizontal direction and the cathode lens action is weaker in the vertical direction. As a result, the horizontal crossover (object point) 17 position is brought closer to the vicinity of the cathode, and the vertical crossover (object point) 18 position is made farther from the vicinity of the cathode, and the prefocus lens 13 region or the prefocus lens It is formed in a place beyond 13 areas.

In this case, the action of the prefocus lens 13 formed by the acceleration electrode 3, the additional electrode 4 and the first focusing electrode 6 is changed by changing the voltage of the additional electrode 4 according to the deflection angle of the electron beam. , Change dynamically. Thereby, the beam divergence angle characteristics in the horizontal and vertical directions are controlled so as to form a substantially circular beam spot over the entire screen.

At the center of the screen, the voltage (V
By setting s) to be equal to or lower than the acceleration voltage (Vg2), the action of the prefocus lens 13 is strengthened. At this time, since the position of the crossover 17 is in front of the prefocus lens 13 in the horizontal direction, the beam diameter in the horizontal direction after passing through the prefocus lens 13 after being strongly focused is reduced.

In the vertical direction, the position of the crossover 18 is located in the prefocus lens 13 area or beyond the prefocus lens 13 area. Therefore, if the prefocus lens 13 has a strong action, after passing through the prefocus lens 13, The beam diameter in the vertical direction becomes larger. That is,
The beam diameter shape after passing through the prefocus lens 13 becomes more vertically long, and the slightly vertically long beam spot shape originally at the center of the screen can be corrected to a substantially perfect circle.

In this case, when the vertical effective diameter (dv) of the main lens 14 is small, the ratio to the vertical beam diameter (bv) after passing through the prefocus lens 13 is (b
v / dv) becomes large, spherical aberration in the main lens 14 becomes large, and the vertical beam spot diameter at the center of the screen increases, so that the main lens system having a large vertical effective aperture (dv) is used. A combination is desirable.

In the peripheral portion of the screen, the voltage of the additional electrode 4 (Vs) is made higher than the acceleration voltage (Vg2) to weaken the action of the prefocus lens 13. At this time, the beam diameter in the horizontal direction after passing through the prefocus lens 13 is larger than that in the above case. Further, the beam diameter in the vertical direction after passing through the prefocus lens 13 is smaller than that in the above case. By setting Vs higher, the beam diameter shape after passing through the prefocus lens 13 can be made horizontally long.

That is, by making the beam diameter shape after passing through the prefocus lens 13 oblong, the original
It is possible to correct the slightly elongated beam spot shape in the peripheral portion of the screen into a substantially perfect circle.

FIG. 7 shows the effect of improving the roundness (vertical diameter / horizontal diameter) of the beam spot at the center and peripheral portions of the screen according to the present invention.

(Embodiment 2) FIG. 8 shows an electron gun of a color picture tube according to Embodiment 2 of the present invention. Three cathodes 1a, 1b, 1c arranged in a straight line in the horizontal direction,
Control electrode 2, acceleration electrode 3, additional electrode 4, first auxiliary electrode 5
An in-line electron gun is composed of A, the second auxiliary electrode 5B, the first focusing electrode 6, the second focusing electrode 7, and the final accelerating electrode 8.

As shown in FIG. 2, the control electrode 2 is provided with non-circular (rectangular) electron beam passage holes 2a, 2b and 2c, which are arranged so that their longitudinal directions are along the vertical direction. (That is, it is vertically long). The ratio of the vertical hole diameter (Dv) to the horizontal hole diameter (Dh) of this rectangular hole, Dv
/ Dh is 1.3 to 2.0.

On the first focusing electrode 6 side of the second auxiliary electrode 5B, vertically elongated non-circular (rectangular) electron beam passage holes 5a, 5 are formed.
b and 5c are provided. A horizontally long non-circular (rectangular) electron beam passage hole 6 is formed on the second auxiliary electrode 5 side of the first focusing electrode 6.
a, 6b, 6c are provided.

On the second focusing electrode 7 side of the first focusing electrode 6, vertically elongated non-circular (rectangular) electron beam passage holes 6d, 6e, 6f are provided.
Is provided. On the first focusing electrode 6 side of the second focusing electrode 7, a horizontally long non-circular (rectangular) electron beam passage holes 7a, 7 are provided.
b and 7c are provided.

As described above, the facing portion of the second auxiliary electrode 5B and the first focusing electrode 6, and the first focusing electrode 6 and the second focusing electrode 7 are arranged.
The electron beam passage portion of each electrode in the portion facing each other has a structure which is axisymmetric with respect to the beam axis.

A constant focus voltage Vfoc is applied to the first auxiliary electrode 5 and the first focusing electrode 6. The second auxiliary electrode 5B and the second focusing electrode 7 are applied with a focus voltage Vfoc superposed with a dynamic voltage 9 that rises as the deflection angle of the electron beam increases.

By applying the dynamic voltage, a potential difference is generated between the second auxiliary electrode 5B and the first focusing electrode 6 and between the first focusing electrode 6 and the second focusing electrode 7, respectively. Between the second auxiliary electrode 5B and the first focusing electrode 6, a first quadrupole lens that diverges in the horizontal direction and converges in the vertical direction is formed, and the first focusing electrode 6 and the second focusing electrode 7 are formed. In between, there is a second 4 that is horizontally focused and vertically diverged.
A polar lens is formed.

Further, the potential difference between the second focusing electrode 7 and the final accelerating electrode 8 becomes small and the main lens becomes weak. Second
The quadrupole lens cancels vertical overfocusing due to a distorted magnetic field, and at the same time, the main lens is weakened to correct defocusing due to an increase in the distance to the fluorescent screen during deflection. Focusing of the electron beam on the part is realized. The first quadrupole lens acts to reduce the difference between the horizontal incident angle and the vertical incident angle on the screen and reduce the lateral elliptical distortion of the peripheral spot.

Further, the dynamic voltage 10 which changes according to the deflection angle of the electron beam is applied to the additional electrode 4 provided between the acceleration electrode 3 and the first auxiliary electrode 5A. The dynamic voltage 10 is a voltage different from the dynamic voltage 9 applied to the second focusing electrode 7. Additional electrode 4
In the center of the screen, a voltage equal to or lower than the acceleration voltage (Vg2) is applied, and a voltage that gradually increases as the deflection angle is increased is applied.
Thereby, the acceleration electrode 3, the additional electrode 4, the first auxiliary electrode 5
By dynamically changing the prefocus lens function formed by A, and controlling the beam divergence characteristics in the horizontal and vertical directions so that the beam spots become a nearly circular beam spot over the entire screen, the central and peripheral parts of the screen are displayed. The uniformity of the beam spot can be improved.

In the above first and second embodiments, the case where the non-circular electron beam passage hole of the control electrode and the focusing electrode system has a rectangular shape has been described, but other shapes such as an ellipse and an ellipse are also possible. Good.

[0048]

According to the present invention, it is possible to improve the beam spot deflection distortion (horizontally long shape) in the peripheral portion of the screen, which is a problem in the in-line self-convergence method. The beam spot shape can be formed in a substantially circular shape at the center and the peripheral portion of the screen, and the uniformity of the resolution performance can be realized over the entire screen.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a part of an electron gun of a conventional color picture tube.

FIG. 2 is a front view of a control electrode forming the electron gun of FIG.

FIG. 3 is a sectional view showing a part of an electron gun of the color picture tube according to the first embodiment of the present invention.

FIG. 4 is a diagram showing a dynamic voltage of an additional electrode.

FIG. 5 is a conceptual diagram showing the behavior of the electron beam at the center of the screen.

FIG. 6 is a conceptual diagram showing the behavior of an electron beam in the periphery of the screen.

FIG. 7 is a diagram showing the effect of improving the roundness of the beam spot according to the present invention.

FIG. 8 is a sectional view showing an electron gun portion of a color picture tube according to a second embodiment of the present invention.

[Explanation of symbols]

1a, 1b, 1c cathode 2 control electrode 2a, 2b, 2c electron beam passage hole 3 acceleration electrode 4 additional electrode 5A first auxiliary electrode 5B second auxiliary electrode 5a, 5b, 5c electron beam passage hole 6 first focusing electrode 6a, 6b, 6c, 6d, 6e, 6f Electron beam passage hole 7 Second focusing electrodes 7a, 7b, 7c Electron beam passage hole 8 Final acceleration electrode 9 Dynamic voltage 10 Dynamic voltage 12 Electron beam 13 Prefocus lens 14 Main lens 15 Screen 16 4-pole lens 17, 18 crossover

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Claims (7)

[Claims] 1. In an in-line color picture tube comprising an electron gun having three cathodes arranged horizontally in-line, a control electrode, an accelerating electrode, a focusing electrode system and an anode, the control electrodes being vertically long. The focusing electrode system has a non-circular electron beam passage hole, and the focusing electrode system includes a first focusing electrode to which a predetermined focus voltage is applied and a second focusing electrode to which a voltage that changes according to a deflection angle of the electron beam is applied. The first focusing electrode and the second focusing electrode have a non-circular electron beam passage hole, an additional electrode is provided between the accelerating electrode and the first focusing electrode, and the additional electrode When the electron beam scans the central part of the screen, the voltage applied to the electrodes is equal to or lower than the voltage of the accelerating electrode, and the voltage is the starting point. , Electric A color picture tube in which the applied voltage gradually increases as the scanning position of the child beam moves toward the peripheral portion of the screen. 2. A vertical passage hole diameter (Dv) and a horizontal passage hole diameter (D) of the non-circular electron beam passage hole of the control electrode.
The color picture tube according to claim 1, wherein the ratio (Dv / Dh) of h) is in the range of 1.3 to 2.0. 3. The color picture tube according to claim 1, wherein a main lens formed by the second focusing electrode and the anode has a lens effective diameter in a vertical direction larger than a lens effective diameter in a horizontal direction. 4. In an in-line color picture tube comprising an electron gun having three cathodes arranged horizontally in-line, a control electrode, an accelerating electrode, a focusing electrode system and an anode, the control electrodes being vertically long. The focusing electrode system has a non-circular electron beam passage hole, and the focusing electrode system includes a first focusing electrode to which a predetermined focus electrode is applied and a second focusing electrode to which a voltage that changes according to the deflection angle of the electron beam is applied. The first focusing electrode and the second focusing electrode have a non-circular electron beam passage hole, an additional electrode is provided between the accelerating electrode and the first focusing electrode, and the additional electrode is provided. When the electron beam scans the central part of the screen, the voltage applied to is equal to or lower than the voltage of the accelerating electrode, and based on the voltage, Electronic As the scanning position of the beam moves toward the peripheral portion of the screen, the applied voltage gradually increases, and a first auxiliary electrode and a second auxiliary electrode are provided between the additional electrode and the first focusing electrode, A color picture tube in which the first focusing electrode and the first auxiliary electrode are connected by a conductor, and the second focusing electrode and the second auxiliary electrode are connected by a conductor. 5. A longitudinal direction of a non-circular electron beam passage hole formed on a surface of the first focusing electrode facing the second auxiliary electrode is horizontal, and the first focusing of the second auxiliary electrode is horizontal. The color picture tube according to claim 4, wherein the longitudinal direction of the non-circular electron beam passage hole formed on the surface facing the electrode is the vertical direction. 6. A vertical passage hole diameter (Dv) and a horizontal passage hole diameter (D) of the non-circular electron beam passage hole of the control electrode.
The color picture tube according to claim 4, wherein the ratio (Dv / Dh) of h) is in the range of 1.3 to 2.0. 7. The color picture tube according to claim 4, wherein a main lens formed by the second focusing electrode and the anode has a lens effective diameter in a vertical direction larger than a lens effective diameter in a horizontal direction.