JPH09223469A - Color image receiving tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an in-line type color image receiving tube in which transversely long elliptical strain of irradiation spots in the peripheral parts of a screen is lessened. SOLUTION: This color image receiving tube is provided with an electron gun comprising horizontally in-line arranged three cathodes 1a-1c, a control electrode 2, an acceleration electrode 3, and a focus electrode system and the focus electrode system contains a pair of focus electrodes having opposing faces in which non-circular electron beam passing holes are formed. A prescribed focus voltage is applied to a first focus electrode 6 and voltage altered corresponding to the deflection angle of electron beam is applied to a second focus electrode 7. Electron beam passing holes which are non-circular and long in the vertical direction are formed on the cathode 1 side of the control electrode 2 and electron beam passing holes which are non-circular and long in the horizontal direction are formed on the acceleration electrode 3 side of the control electrode 2.

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 a high resolution can be obtained over the entire surface of a phosphor screen.

[0002]

2. Description of the Related Art In an in-line color picture tube device in which three electron beam radiating 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. By doing
Three electron beams are automatically focused on the entire phosphor screen.
However, this magnetic field causes a vertical electron beam to be excessively focused at the peripheral portion of the phosphor screen and causes defocusing, resulting in a problem that the resolution is deteriorated.

Japanese Unexamined Patent Publication No. 61-99249 discloses one means for solving this problem. In Figure 64,
The structure of this conventional electron gun is shown. Cathodes 1a, 1b, 1
c, control electrode 2, accelerating electrode 3, first focusing electrode 6, second focusing electrode 7, and final accelerating electrode 8 are sequentially arranged, and a circular electron beam passes through the control electrode 2 as shown in FIG. Holes 2a, 2b, 2c are provided. As shown in FIG. 66, vertically long non-circular (rectangular) electron beam passage holes 6d, 6e, 6f are provided on the second focusing electrode 7 side of the first focusing electrode 6, and as shown in FIG. Horizontally long non-circular (rectangular) electron beam passage holes 7a, 7b, 7c are provided on the first focusing electrode 6 side of the focusing electrode 7.

Then, the focus voltage Vfoc is applied to the first focusing electrode 6, and the second focus electrode 7 is applied with a dynamic voltage which rises with an increase in the deflection angle of the electron beam, which is superposed on the focus voltage Vfoc. By applying the dynamic voltage, a potential difference is generated between the first focusing electrode 6 and the second focusing electrode 7 to form a quadrupole lens, and at the same time, between the second focusing electrode 7 and the final accelerating electrode 8. The potential difference decreases and the main lens weakens. The vertical focusing due to the distorted magnetic field is canceled by the generation of the quadrupole lens, and at the same time, the defocusing due to the expansion of the distance to the fluorescent screen during deflection is corrected by the weakening of the main lens. Focusing of the electron beam is realized.

[0005]

However, since the screen incident angle differs between the horizontal direction and the vertical direction, a magnification difference occurs, and the spot focused on the peripheral portion of the phosphor screen has a larger horizontal diameter and a smaller vertical diameter. , It is distorted into a horizontally long ellipse. An increase in the horizontal diameter causes deterioration of resolution, and a decrease in the vertical diameter causes generation of moire, which is an interference fringe between the scanning line and the hole array of the shadow mask. So, spread the beam horizontally,
A method is provided in which means for narrowing down in the vertical direction is provided to reduce the difference between the screen incident angle in the horizontal direction and the screen incident angle in the vertical direction to reduce the oblong elliptical shape distortion of the peripheral spots (JP-A-3-93135). .

However, in this method, when the beam spreads too much in the horizontal direction, the spot increases due to the spherical aberration of the main lens, so there is a limit to the reduction of the horizontal spot diameter. Therefore, the lateral elliptical distortion of the spot cannot be completely corrected when the beam expands, especially when the current is large, or when the lateral lateral distortion of the peripheral spots is likely to be remarkable due to flattening of the panel or expansion of the deflection angle.

Therefore, an object of the present invention is to provide a color picture tube capable of reducing the peripheral spot distortion more than in the conventional case and obtaining a high resolution in the peripheral portion of the phosphor screen even in the above case.

[0008]

One construction of a color picture tube according to the present invention comprises three horizontal in-line arrangements.
In an in-line color picture tube including an electron gun having a cathode, a control electrode, an accelerating electrode, and a focusing electrode system, the focusing electrode system deflects an electron beam with a first focusing electrode to which a predetermined focus voltage is applied. A second focusing electrode to which a voltage that changes according to an angle is applied, wherein the first focusing electrode and the second focusing electrode have a structure in which an electron beam passage portion is non-axisymmetric with respect to a beam axis; The control electrode has a non-circular electron beam passage hole which is long in the vertical direction.

Another construction of the color picture tube according to the present invention is
In an in-line color picture tube equipped with an electron gun having three cathodes arranged horizontally in-line, a control electrode, an accelerating electrode and a focusing electrode system, said focusing electrode system comprises
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 are applied are included. The first focusing electrode and the second focusing electrode are The beam passage portion has a structure that is non-axisymmetric with respect to the beam axis, and a non-circular electron beam passage hole that is long in the vertical direction is formed on the cathode side of the control electrode, and the control electrode has the above-mentioned structure. A non-circular electron beam passage hole that is long in the horizontal direction is formed on the accelerating electrode side.

[0010]

1 to 3 show a first embodiment of the present invention. As shown in FIG. 1, the three cathodes 1a, 1b, and 1c arranged on a straight line in the horizontal direction include a control electrode 2,
Accelerating electrode 3, and three electrodes forming a focusing electrode system,
That is, the first focusing electrode 6, the second focusing electrode 7, and the final accelerating electrode 8 constitute an in-line type electron gun. As shown in FIG. 2, 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). As shown in FIG. 3, vertically elongated non-circular (rectangular) electron beam passage holes 6d, 6 are formed on the end surface of the first focusing electrode 6 on the second focusing electrode 7 side.
e and 6f are provided. Also, as shown in FIG.
The longitudinal direction of the non-circular (rectangular) electron beam passage holes 7a, 7b, 7c provided on the end surface of the second focusing electrode 7 on the first focusing electrode 6 side is horizontal (that is, horizontally long). 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.
Then, the second focusing electrode 7 is provided with a focus voltage Vfoc superposed with a dynamic voltage that rises with an increase in the deflection angle of the electron beam.

Details of the behavior of the electron beam at this time will be described with reference to FIG. 5 for the horizontal direction and FIG. 6 for the vertical direction. By applying the dynamic voltage, a potential difference is generated between the first focusing electrode 6 and the second focusing electrode 7 to form the quadrupole lens 15, and at the same time, the second focusing electrode 7 and the final acceleration electrode 8 are formed. Between them, the potential difference becomes small and the main lens 16 weakens. Generation of the quadrupole lens 15 cancels vertical overfocusing due to a distorted magnetic field, and at the same time, weakening of the main lens 16 corrects defocusing due to expansion of the distance to the fluorescent screen during deflection. Focusing of the electron beam at the peripheral portion of the surface is improved.

Since the control electrode 2 having the vertically long non-circular electron beam passage hole has a small hole diameter in the horizontal direction, the operating area of the cathode becomes small and the current density becomes large.
1 becomes smaller. Moreover, since the cathode lens 12 works strongly, the position of the object point can be brought close to the cathode, and the focusing action of the prefocus lens 13 is strongly received, so that the beam is focused. On the contrary, since the electron beam passage hole of the control electrode 2 is large in the vertical direction, the object point 11 becomes large and the beam spreads.

Since the object point 11 is focused by the lens action and imaged on the fluorescent screen is a spot, the object point 1
1 is small, the spot becomes small in the horizontal direction, and the object point 11
The larger the spot, the larger the spot in the vertical direction. Therefore, the lateral elliptical distortion of the peripheral spot can be improved.

Conventionally, for example, a non-axisymmetric electron beam passage hole is provided in an accelerating electrode or the like to spread the beam in the horizontal direction and narrow the beam in the vertical direction to correct the lateral elliptical distortion of the peripheral spot. However, there is a problem that the spot diameter increases due to the aberration of the main lens when the beam spreads too much at the time of a large current. On the other hand, in the present invention, since the beam is focused in the horizontal direction even in the above case, it is less susceptible to the aberration of the main lens,
The distortion can be corrected without increasing the spot even when the current is large.

The above-described effect of the control electrode 2 having the vertically long non-circular electron beam passage hole is effective when the peripheral spot is focused. That is, it is effective in combination with an electron gun having a quadrupole lens that corrects vertical overfocusing due to a magnetic field. An electron gun without a quadrupole lens does not focus in the vertical direction and forms a spot with haze (blurring) in the core (central part), which increases the vertical object point and causes haze even when the core expands. Since it is covered and does not lead to a change in spot diameter, the above effect cannot be exhibited.

As an example, when the electron beam passage hole of the control electrode 2 is a rectangle having a horizontal length of 0.35 mm and a vertical length of 0.45 mm, a conventional diameter of 0.4
The spot diameter is about 15% smaller in the horizontal direction and about 10% in the vertical direction compared to the circular electron beam passage hole of mm.
% Increased. At this time, the current value is 0.3 mA. In this way, the lateral oblong distortion of the spot in the peripheral portion of the conventional phosphor screen is improved.

Modifications of this embodiment are shown in FIGS.
In the modification shown in FIGS. 7 and 8, the electron beam passage hole of the accelerating electrode 3 has a stepwise cross section, and a laterally long concave portion (square hole) is formed on the surface on the first focusing electrode 6 side. In the modification shown in FIGS. 9 and 10, the electron beam passage hole of the first focusing electrode 6 has a stepwise cross section, and a vertically long concave portion (square hole) is formed on the surface on the accelerating electrode 3 side. In the modified examples shown in FIGS. 11 to 13, the electron beam passage holes of both the acceleration electrode 3 and the first focusing electrode 6 have the stepped cross section as described above.

Since the electron beam passage hole having the stepped section has a function of narrowing the vertical beam diameter, it is possible to prevent the vertical beam diameter from becoming excessively large due to the vertically long electron beam passage hole of the control electrode 2. . As a result, it is possible to prevent the phenomenon that the vertical spot diameter excessively increases due to the spherical aberration of the main lens.

The horizontally long concave portion is not limited to the shape that individually surrounds the three electron beam passage holes as shown in FIG. 8, but may be a shape that collectively surrounds the three electron beam passage holes as shown in FIG. It may be. Further, as a method of forming the electron beam passage hole having the stepwise cross section as described above, FIG.
Alternatively, as shown by 16, an ordinary round hole may be provided in the accelerating electrode 3 or the first focusing electrode 6, and a horizontally long or vertically long square hole may be provided in another electrode plate, and both may be overlapped and welded.

Next, second to fourth embodiments of the present invention are shown in FIGS. In the second embodiment shown in FIG. 17, the same focus voltage V as that of the first focusing electrode 6 is applied to the first auxiliary electrode 4.
This is an electron gun to which foc is applied and the same voltage as that of the acceleration electrode 3 is applied to the second auxiliary electrode 5. The third embodiment shown in FIG. 18 is an electron gun in which the same voltage as that of the second focusing electrode 7 is applied to the first auxiliary electrode 4, and the same voltage as that of the accelerating electrode 3 is applied to the second auxiliary electrode 5. Both the second and third embodiments have means for narrowing the beam with two prefocus lenses. Further, the fourth embodiment shown in FIG.
The same focusing voltage Vf as that of the first focusing electrode 6 is applied to the auxiliary electrode 4.
oc is applied, and the same voltage as that of the final acceleration electrode 8 is applied to the second auxiliary electrode 5, which is a multi-stage focusing electron gun.

Each of the electron guns shown in FIGS. 17 to 19 has a quadrupole lens, and the lens system for focusing the beam on the fluorescent screen is different from that of the first embodiment. With the control electrode 2 having the beam passage hole, the effect of improving the lateral elliptical distortion of the peripheral spot can be obtained as in the case of the first embodiment.

Modifications of the second to fourth embodiments are shown in FIGS.
22. In the modification shown in FIG. 20, the electron beam passage hole of the accelerating electrode 3 has a stepwise cross section, and a horizontally long concave portion (square hole) is formed on the surface on the first auxiliary electrode 4 side. In the modification shown in FIG. 21, the electron beam passage hole of the first auxiliary electrode 4 has a stepwise cross section, and a vertically long concave portion (square hole) is formed on the surface on the accelerating electrode 3 side.
Are formed. In the modification shown in FIG. 22, the electron beam passage holes of both the acceleration electrode 3 and the first auxiliary electrode 4 have the stepped cross section as described above.

Although a front view of the acceleration electrode 3 and the first auxiliary electrode 4 is omitted, it is the same as that shown in the modification of the first embodiment. 20-22, the acceleration electrode 3, the 1st auxiliary electrode 4, and the 2nd auxiliary electrode 5 are shown.
The connection between the voltage application line and
Each connection method of 9 can be adopted.

Since the electron beam passage hole of these modified examples acts to reduce the vertical beam diameter, it is possible to prevent the vertical beam diameter from becoming excessively large due to the vertically long electron beam passage hole of the control electrode 2. As a result, it is possible to prevent the phenomenon that the vertical spot diameter excessively increases due to the spherical aberration of the main lens.

The same effect can be obtained by forming the stepped cross section as described above for the electron beam passage holes of the other electrodes. For example, a vertically long recess is provided on the surface of the first auxiliary electrode 4 on the second auxiliary electrode 5 side or the surface of the first focusing electrode 6 on the second auxiliary electrode 5 side, or the first auxiliary electrode of the second auxiliary electrode 5 is formed. A laterally long concave portion can be provided on the surface on the side of 4 or the surface of the second auxiliary electrode 5 on the side of the first focusing electrode 6.

The laterally elongated recess is not limited to the shape that individually surrounds the three electron beam passage holes, but may be a shape that collectively surrounds the three electron beam passage holes as shown in FIG.
Further, as a method of forming the electron beam passage hole having the stepwise cross section as described above, as in the case shown in FIG. 15 or 16, an ordinary round hole is provided in the acceleration electrode 3 or the first auxiliary electrode 4. Alternatively, a horizontally long or vertically long square hole may be provided in another electrode plate, and both may be overlapped and welded.

Next, FIG. 23 shows a fifth embodiment of the present invention. Three cathodes 1a, 1 arranged in a horizontal straight line
b and 1c constitute an in-line type electron gun together with the control electrode 2, the acceleration electrode 3, the first auxiliary electrode 4, the second auxiliary electrode 5, the first focusing electrode 6, the second focusing electrode 7, and the final acceleration electrode 8. ing. As shown in FIG. 24, the control electrode 2 has vertically elongated non-circular (rectangular) electron beam passage holes 2a, 2b, 2b.
c is provided. As shown in FIG. 25, vertically long non-circular (rectangular) electron beam passage holes 5a, 5b, 5c are provided on the side of the first focusing electrode 6 of the box-shaped second auxiliary electrode 5. The box-shaped first focusing electrode 6 has a second auxiliary electrode 5 side as shown in FIG.
As shown in FIG. 6, horizontally long non-circular (rectangular) electron beam passage holes 6 a, 6 b, 6 c are provided, and the second focusing electrode 6
As shown in FIG. 27, vertically long non-circular (rectangular) electron beam passage holes 6d, 6e and 6f are provided on the focusing electrode 7 side. As shown in FIG. 28, horizontally long non-circular (rectangular) electron beam passage holes 7a, 7b, 7c are provided on the side of the first focusing electrode 6 of the box-shaped second focusing electrode 7. As described above, the electron beam passage portion of each electrode in the facing portion between the second auxiliary electrode 5 and the first focusing electrode 6 and the facing portion between the first focusing electrode 6 and the second focusing electrode 7 is non-related to the beam axis. It has an axisymmetric structure. A focus voltage Vfoc is applied to the first auxiliary electrode 4 and the first focusing electrode 6, and a dynamic voltage that rises with an increase in the deflection angle of the electron beam is focused on the second auxiliary electrode 5 and the second focusing electrode 7. A voltage superimposed on the voltage Vfoc is applied.

Details of the behavior of the electron beam at this time will be described with reference to FIG. 29 for the horizontal direction and FIG. 30 for the vertical direction. By applying the dynamic voltage, a potential difference is generated between the second auxiliary electrode 5 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 5 and the first focusing electrode 6, there is a quadrupole lens 14 which is horizontally divergent and vertically focused.
Is formed between the first focusing electrode 6 and the second focusing electrode 7, and the quadrupole lens 1 has a horizontal focusing type and a vertical diverging type.
5 are formed. Further, the potential difference between the second focusing electrode 7 and the final accelerating electrode 8 becomes small and the main lens 16 becomes weak. The quadrupole lens 15 cancels vertical overfocusing due to the distorted magnetic field, and at the same time, the main lens 16 is weakened to correct defocusing due to an increase in the distance to the fluorescent screen at the time of deflection. Focusing of the electron beam on the part is realized.

Further, the quadrupole lens 14 works in a direction to reduce the difference between the screen incident angle in the horizontal direction and the vertical direction and to reduce the lateral elliptic distortion of the peripheral spot, but has a vertically long non-circular electron beam passage hole. By the action of the control electrode 2, the beam diameter in the horizontal direction is narrowed compared to the case of the conventional circular electron beam passage hole, so that the beam does not spread too much. Thereby, the spherical aberration of the main lens 16 can be suppressed, and the increase of the horizontal spot diameter can be suppressed even with a large current.

As described above, the object point 11 is in the horizontal direction.
Is smaller, the horizontal diameter of the peripheral spot can be made smaller, and the vertical diameter of the peripheral spot can be made larger by increasing the object point 11 in the vertical direction. Can be improved.

A modified example of this embodiment is shown in FIGS. In the modification shown in FIG. 31, the electron beam passage hole of the accelerating electrode 3 has a stepwise cross section, and a horizontally long concave portion (square hole) is formed on the surface on the first auxiliary electrode 4 side. In the modification shown in FIG. 32, the electron beam passage hole of the first auxiliary electrode 4 has a stepwise cross section, and a vertically long concave portion (square hole) is formed on the surface on the accelerating electrode 3 side. In the modification shown in FIG. 33, the acceleration electrode 3 and the first
Both electron beam passage holes of the auxiliary electrode 4 have the stepped cross section as described above.

Since the electron beam passage holes of these modified examples act to narrow the vertical beam diameter, it is possible to prevent the vertical beam diameter from becoming excessively large due to the vertically long electron beam passage holes of the control electrode 2. As a result, it is possible to prevent the phenomenon that the vertical spot diameter excessively increases due to the spherical aberration of the main lens.

The horizontally long recesses are not limited to the shape of individually enclosing the three electron beam passage holes, but may be of a shape that collectively encloses the three electron beam passage holes as shown in FIG. Further, as a method of forming the electron beam passage hole having the stepwise cross section as described above, as in the case shown in FIG. 15 or 16, an ordinary round hole is provided in the acceleration electrode 3 or the first auxiliary electrode 4. Alternatively, a horizontally long or vertically long square hole may be provided in another electrode plate, and both may be overlapped and welded.

The electron beam passage hole of the control electrode 2 is not necessarily rectangular, but may be elliptical or oval as shown in FIG. Next, FIG. 35 shows a sixth embodiment of the present invention. The three cathodes 1a, 1b, 1c arranged in a horizontal straight line include a control electrode 2, an acceleration electrode 3,
The first focusing electrode 6, the second focusing electrode 7, and the final accelerating electrode 8 constitute an in-line type electron gun. FIG.
And 36, the electron beam passage hole of the control electrode 2 has a stepped cross section. That is, vertically long non-circular (rectangular) electron beam passage holes 2a, 2b, 2c are formed on the surface on the cathode 1 side, and horizontally long non-circular (rectangular) electron beam passage holes 2d on the surface on the accelerating electrode 3 side. 2e and 2f are formed.

On the side of the second focusing electrode 7 of the box-shaped first focusing electrode 6, a vertically long non-circular shape (rectangle) as shown in FIG.
Electron beam passage holes 6d, 6e, 6f are formed.
On the side of the first focusing electrode 6 of the box-shaped second focusing electrode 7, FIG.
Horizontally long non-circular (rectangular) electron beam passage hole 7 as shown in FIG.
a, 7b, and 7c are formed. Then, a constant focus voltage Vfoc is applied to the first focusing electrode 6,
The focusing electrode 7 is provided with a dynamic voltage which increases from the focus voltage Vfoc as the deflection angle of the electron beam increases.

The behavior of the electron beam in the in-line type electron gun having such a configuration is shown in FIG.
The vertical direction will be described with reference to FIG. When a dynamic voltage is applied to the second focusing electrode 7, a potential difference occurs between the first focusing electrode 6 and the second focusing electrode 7 to form the quadrupole lens 15, 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 1
6 weakens. Generation of the quadrupole lens 15 cancels vertical overfocusing due to a distorted magnetic field, and weakening of the main lens 16 corrects defocusing due to an increase in the distance to the fluorescent screen at the time of deflection. Focusing of the electron beam on the part is realized.

Since the electron beam passage hole as shown in FIG. 36 is provided in the control electrode 2, in the horizontal direction,
As shown in FIG. 39, the operating area of the cathode is small and the current density is large because the hole diameter is small.
Becomes smaller and the object point tends to be formed closer to the cathode. On the other hand, regarding the vertical direction, FIG.
As shown in (1), since the operating area of the cathode is large and the current density is small due to the large hole diameter, the object point 11 becomes large, and the object point tends to be formed at a position farther from the cathode.

Further, the thickness of the control electrode 2 in the peripheral portion of the electron beam passage hole is thin in the horizontal direction and thick in the vertical direction. Therefore, the cathode lens 12 works weakly in the horizontal direction, and the object point tends to be formed farther from the cathode.
The cathode lens 12 works strongly in the vertical direction, and the object point tends to be formed closer to the cathode. As a result, the positions of the object points in the horizontal direction and the vertical direction can be matched. As a result, the optimum focus voltage difference between the horizontal direction and the vertical direction is eliminated, so that the weakening of the quadrupole lens is eliminated and the necessary quadrupole lens action can be obtained. Also,
Since the spot is the object point 11 focused by the lens action and imaged on the phosphor screen, the spot becomes small in the horizontal direction where the object point 11 is small, and the spot becomes large in the vertical direction where the object point 11 is large. In this way, the lateral elliptical distortion of the peripheral spots can be improved.

Further, a vertically long beam can be obtained by appropriately selecting the aspect ratio of the hole diameter of the control electrode 2 and the plate thickness in the horizontal direction and the vertical direction at the periphery of the electron beam passage hole. In order to further correct the lateral elliptical distortion of the peripheral spot, such as by providing a non-axisymmetric electron beam passage hole in the acceleration electrode etc., when expanding the beam in the horizontal direction and narrowing the beam in the vertical direction, when a large current is applied, etc. Regarding the problem that the horizontal direction beam spreads too much and the spot diameter increases due to the aberration of the main lens, the above method suppresses the beam in the horizontal direction and is less susceptible to the aberration of the main lens. You can

The effect of the control electrode 2 having the non-circular electron beam passage hole becomes effective only when the peripheral spot is focused. That is, the effect is exhibited only in combination with an electron gun having a quadrupole lens that corrects vertical overfocusing due to a magnetic field. An electron gun that does not have a quadrupole lens does not focus in the vertical direction and forms a spot with haze (blurring) in the core (central part), but even if the object point grows vertically and the core expands, haze This is because it is covered by the and does not lead to a change in spot diameter.

A modified example of this embodiment is shown in FIGS. In the modification of FIG. 41, the electron beam passage hole of the accelerating electrode 3 has a stepwise cross section, and a laterally long concave portion (square hole) is formed on the surface on the first focusing electrode 6 side. In the modified example of FIG. 42, the electron beam passage hole formed on the accelerating electrode 3 side of the box-shaped first focusing electrode 6 has a stepwise cross section, and a vertically long concave portion (each hole) is formed on the surface on the accelerating electrode 3 side. Are formed. In the modification of FIG. 43, the electron beam passage holes on both the acceleration electrode 3 and the first focusing electrode 6 on the side of the acceleration electrode 3 have the stepped cross section as described above.

Since the electron beam passage hole having the stepwise section has a function of narrowing the vertical beam diameter, it is possible to prevent the vertical beam diameter from becoming excessively large due to the vertically long electron beam passage hole of the control electrode 2. . As a result, it is possible to prevent the phenomenon that the vertical spot diameter excessively increases due to the spherical aberration of the main lens.

The horizontally long concave portions are not limited to the shape that individually surrounds the three electron beam passage holes, but may have a shape that collectively surrounds the three electron beam passage holes as shown in FIG. Further, as a method of forming the electron beam passage hole having the stepwise cross section as described above, as in the case shown in FIG. 15 or 16, an ordinary round hole is provided in the acceleration electrode 3 or the first auxiliary electrode 4. Alternatively, a horizontally long or vertically long square hole may be provided in another electrode plate, and both may be overlapped and welded.

Next, FIGS. 44 to 46 show seventh to ninth embodiments of the present invention. In these embodiments, the acceleration electrode 3
The first auxiliary electrode 4 and the second auxiliary electrode 5 are provided between the first auxiliary electrode 4 and the first focusing electrode 6. In the seventh embodiment shown in FIG. 44, the same focus voltage Vfoc as that of the first focusing electrode 6 is applied to the first auxiliary electrode 4, and the same voltage as that of the acceleration electrode 3 is applied to the second auxiliary electrode 5. In the eighth embodiment shown in FIG. 45, the same voltage as that of the second focusing electrode 7 is applied to the first auxiliary electrode 4, and the same voltage as that of the acceleration electrode 3 is applied to the second auxiliary electrode 5. In both the seventh and eighth embodiments, 2
This is an electron gun that has means for narrowing the beam with a single prefocus lens. Further, in the ninth embodiment shown in FIG. 46, the same focus voltage Vfoc as that of the first focusing electrode 6 is applied to the first auxiliary electrode 4, and the same voltage as that of the final acceleration electrode 8 is applied to the second auxiliary electrode 5. It is a multi-stage focusing electron gun.

The seventh to ninth embodiments are different from the sixth embodiment only in the lens system for focusing the beam on the fluorescent screen. Since the lens system has a quadrupole lens, a control having a non-circular electron beam passage hole is provided. The point that the above-described effect of the electrode 2 can be obtained is the same as in the sixth embodiment.

Modifications of the seventh to ninth embodiments are shown in FIGS.
49. In the modification of FIG. 47, the electron beam passage hole of the accelerating electrode 3 has a stepwise cross section, and a horizontally long concave portion (square hole) is formed on the surface on the first auxiliary electrode 4 side. In the modification of FIG. 48, the electron beam passage hole of the first auxiliary electrode 4 has a stepwise cross section, and a vertically long concave portion (square hole) is formed on the surface on the accelerating electrode 3 side. In the modification of FIG. 49, the electron beam passage holes of both the acceleration electrode 3 and the first auxiliary electrode 4 have the stepped cross section as described above.

Although a front view of the acceleration electrode 3 and the first auxiliary electrode 4 is omitted, it is the same as that shown in the modification of the first embodiment. 47 to 49, the acceleration electrode 3, the first auxiliary electrode 4, and the second auxiliary electrode 5
44 to 4 although the connection between the voltage applying line and the voltage applying line is omitted.
Each connection method of 6 can be adopted.

Since the electron beam passage hole of these modified examples acts to narrow the vertical beam diameter, it is possible to prevent the vertical beam diameter from becoming excessively large due to the vertically long electron beam passage hole of the control electrode 2. As a result, it is possible to prevent the phenomenon that the vertical spot diameter excessively increases due to the spherical aberration of the main lens.

With respect to the electron beam passage holes of the other electrodes, the same effect can be obtained by forming the stepped cross section as described above. For example, a vertically long recess is provided on the surface of the first auxiliary electrode 4 on the second auxiliary electrode 5 side or the surface of the first focusing electrode 6 on the second auxiliary electrode 5 side, or the first auxiliary electrode of the second auxiliary electrode 5 is formed. A laterally long concave portion can be provided on the surface on the side of 4 or the surface of the second auxiliary electrode 5 on the side of the first focusing electrode 6.

Note that the horizontally long concave portions are not limited to the shape that individually surrounds the three electron beam passage holes, but may have a shape that collectively surrounds the three electron beam passage holes as shown in FIG. Further, as a method of forming the electron beam passage hole having the stepwise cross section as described above, as in the case shown in FIG. 15 or 16, an ordinary round hole is provided in the acceleration electrode 3 or the first auxiliary electrode 4. Alternatively, a horizontally long or vertically long square hole may be provided in another electrode plate, and both may be overlapped and welded.

Next, a tenth embodiment of the present invention will be described with reference to FIG.
Shown in Three cathodes 1a, 1 arranged in a horizontal straight line
b and 1c constitute an in-line type electron gun together with the control electrode 2, the acceleration electrode 3, the first auxiliary electrode 4, the second auxiliary electrode 5, the first focusing electrode 6, the second focusing electrode 7, and the final acceleration electrode 8. ing. As shown in FIGS. 50 and 51, the electron beam passage hole of the control electrode 2 has a stepped cross section. That is, vertically long non-circular (rectangular) electron beam passage holes 2a, 2b, 2c are formed on the surface on the cathode 1 side, and horizontally long non-circular (rectangular) electron beam passage holes 2d on the surface on the accelerating electrode 3 side. Two
e and 2f are formed.

On the side of the first focusing electrode 6 of the box-shaped second auxiliary electrode 5, a vertically long non-circular (rectangular) shape as shown in FIG.
Electron beam passage holes 5a, 5b and 5c are formed.
On the side of the second auxiliary electrode 5 of the box-shaped first focusing electrode 6, FIG.
Horizontally long non-circular (rectangular) electron beam passage hole 6 as shown in FIG.
a, 6b, 6c are provided, and vertically long non-circular (rectangular) electron beam passage holes 6d, 6e, 6f are formed on the second focusing electrode 7 side of the first focusing electrode 6 as shown in FIG. There is. On the side of the first focusing electrode 6 of the box-shaped second focusing electrode 7, laterally long non-circular (rectangular) electron beam passage holes 7a, 7b, 7c are formed as shown in FIG. The focus voltage Vf is applied to the first auxiliary electrode 4 and the first focusing electrode 6.
oc is applied, and the second auxiliary electrode 5 and the second focusing electrode 7 are applied.
Is applied with a dynamic voltage that rises from the focus voltage Vfoc as the deflection angle of the electron beam increases.

The behavior of the electron beam in the in-line type electron gun having such a structure is shown in FIG.
The vertical direction will be described with reference to FIG. When a dynamic voltage is applied to the second auxiliary electrode 5 and the second focusing electrode 7, a potential difference is generated between the second auxiliary electrode 5 and the first focusing electrode 6 and between the first focusing electrode 6 and the second focusing electrode 7. Occurs,
A quadrupole lens 14 is formed between the second auxiliary electrode 5 and the first focusing electrode 6 so as to diverge in the horizontal direction and to focus in the vertical direction. The quadrupole lens 14 is formed between the first focusing electrode 6 and the second focusing electrode 7. Is a quadrupole lens 15 having a horizontal focusing type and a vertical diverging type. At the same time, the potential difference between the second focusing electrode 7 and the final accelerating electrode 8 becomes small and the main lens 16 weakens. The quadrupole lens 15 cancels vertical overfocusing due to the distorted magnetic field, and the main lens 16
The defocusing corrects the defocus due to the increase in the distance to the phosphor screen during deflection, so that the electron beam can be focused at the peripheral portion of the phosphor screen. Further, the quadrupole lens 14 reduces the difference in screen incident angle between the horizontal direction and the vertical direction and reduces the lateral elliptical distortion of the peripheral spot.

By providing the non-circular (rectangular) electron beam passage hole in the control electrode 2 as shown in FIG. 51, the object point 11 becomes smaller in the horizontal direction as in the sixth embodiment.
The object point 11 becomes larger in the vertical direction, and the positions of the object points in the horizontal direction and the vertical direction can be matched. As a result, the weakening of the quadrupole lens is eliminated, and the necessary quadrupole lens action can be obtained. Further, since the object point 11 is focused by the lens action and imaged on the fluorescent screen is a spot, the spot becomes small in the horizontal direction where the object point 11 is small and the spot becomes large in the vertical direction where the object point 11 is large. . Therefore, the lateral elliptical distortion of the peripheral spot can be further improved.

Further, a vertically long beam can be obtained by appropriately selecting the aspect ratio of the hole diameter of the control electrode 2 and the plate thickness in the horizontal direction and the vertical direction, so that the horizontal beam does not spread too much. Lens 16
Spherical aberration can be suppressed. As a result, it is possible to suppress an increase in the horizontal spot diameter at a large current.

Modifications of this embodiment are shown in FIGS. In the modification shown in FIG. 58, the electron beam passage hole of the accelerating electrode 3 has a stepwise cross section, and a horizontally long concave portion (each hole) is formed on the surface on the first auxiliary electrode 4 side. In the modification shown in FIG. 59, the electron beam passage hole of the first auxiliary electrode 4 has a stepwise cross section, and a vertically long concave portion (each hole) is formed on the surface on the accelerating electrode 3 side. In the modification of FIG. 60, the electron beam passage holes of both the acceleration electrode 3 and the first auxiliary electrode 4 have the stepped cross section as described above.

Since the electron beam passage hole having these stepwise sections acts to narrow the vertical beam diameter, it is possible to prevent the vertical beam diameter from becoming excessively large due to the vertically long electron beam passage hole of the control electrode 2. . As a result, it is possible to prevent the phenomenon that the vertical spot diameter excessively increases due to the spherical aberration of the main lens.

Note that the horizontally long concave portions are not limited to the shape that individually surrounds the three electron beam passage holes, but may have a shape that collectively surrounds the three electron beam passage holes as shown in FIG. Further, as a method of forming the electron beam passage hole having the stepwise cross section as described above, as in the case shown in FIG. 15 or 16, an ordinary round hole is provided in the acceleration electrode 3 or the first auxiliary electrode 4. Alternatively, a horizontally long or vertically long square hole may be provided in another electrode plate, and both may be overlapped and welded.

Embodiments 6 to 10 of the present invention described above
And in those modifications, the electron beam passage hole of the control electrode 2 is not limited to a rectangular shape, and may be a non-circular shape such as an elliptical shape. The combination shape of the electron beam passage hole on the cathode 1 side of the control electrode 2 and the electron beam passage hole on the acceleration electrode 3 side is, as shown in FIGS. 61 to 63, elliptical and rectangular, or elliptical and elliptical. Various combinations are conceivable.

The control electrode 2 is composed of two electrode plates, that is,
It may be manufactured by welding an electrode plate having a vertically long non-circular electron beam passage hole and an electrode plate having a horizontally long non-circular electron beam passage hole. In this case, welding is facilitated by making the vertical diameter of the electron beam passage hole on the cathode side and the vertical diameter of the electron beam passage hole on the acceleration electrode 3 side the same. Also, 2
Instead of stacking and welding the electrode plates, one electrode may be integrally formed by press working as the control electrode 2.

Further, in each of the above embodiments, the electron beam passage hole of each electrode is made non-circular so that the electron beam passage portion is non-axisymmetric with respect to the beam axis. For example, a non-axisymmetric structure can be obtained by providing an electrode portion projecting in the beam axis direction near the periphery of the circular passage hole. Also in this case, the same effect as described above can be obtained.

[0062]

As described above, according to the present invention, in the electron gun having the axially asymmetric lens for correcting the deflection aberration, by providing the control electrode with the non-circular electron beam passage hole which is long in the vertical direction, A color image with improved lateral elliptical distortion of the peripheral spots, which suppresses moire and improves the resolution around the fluorescent screen even under conditions of high current, flat panel, and wide deflection angle. A tube can be provided.

Further, the electron beam passage hole of the control electrode is formed in a non-circular shape having a vertical longitudinal direction on the cathode side and a non-circular shape having a horizontal longitudinal direction on the accelerating electrode side. Since the positions of the points can be matched, the necessary action can be obtained without weakening the quadrupole lens, and the lateral elliptical distortion of the peripheral spots can be improved, resulting in a large current, flat panel, and expansion of the deflection angle. It is possible to suppress the occurrence of moire associated with the above and improve the resolution of the peripheral portion of the phosphor screen.

[Brief description of drawings]

FIG. 1 is a sectional view showing a portion of an electron gun of a color picture tube according to a first embodiment of the present invention.

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

3 is a front view of a first focusing electrode forming the electron gun of FIG. 1. FIG.

4 is a front view of a second focusing electrode forming the electron gun of FIG. 1. FIG.

5 is a drawing in which a horizontal lens electric field acting on an electron beam in the electron gun of FIG. 1 is replaced with an optical lens.

6 is a drawing in which a vertical lens electric field acting on an electron beam in the electron gun of FIG. 1 is replaced with an optical lens.

FIG. 7 is a diagram showing a modification of the electron gun of FIG.

8 is a front view of an accelerating electrode forming the electron gun of FIG.

FIG. 9 is a diagram showing another modification of the electron gun of FIG.

FIG. 10 is a front view of a first focusing electrode forming the electron gun of FIG.

11 is a sectional view showing another modification of the electron gun of FIG.

12 is a front view of an accelerating electrode that constitutes the electron gun of FIG.

FIG. 13 is a front view of a first focusing electrode forming the electron gun of FIG.

FIG. 14 is a front view showing another shape of the acceleration electrode.

FIG. 15 is a sectional view of the electron gun of FIG.

16 is a cross-sectional view of the electron gun of FIG. 9 in which a first focusing electrode has a superposed structure.

FIG. 17 is a sectional view showing an electron gun portion of a color picture tube according to a second embodiment of the present invention.

FIG. 18 is a sectional view showing an electron gun portion of the color picture tube according to the third embodiment of the present invention.

FIG. 19 is a sectional view showing an electron gun portion of a color picture tube according to a fourth embodiment of the present invention.

FIG. 20 is a cross-sectional view showing a modified example of the electron gun of FIGS.

FIG. 21 is a sectional view showing another modification of the electron gun of FIGS.

FIG. 22 is a cross-sectional view showing another modification of the electron gun of FIGS.

FIG. 23 is a sectional view showing an electron gun portion of a color picture tube according to a fifth embodiment of the present invention.

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

FIG. 25 is a front view of a second control electrode forming the electron gun of FIG. 23 on the side of the first focusing electrode.

FIG. 26 is a front view of the first focusing electrode forming the electron gun of FIG. 23 on the second auxiliary electrode side.

FIG. 27 is a front view of the first focusing electrode forming the electron gun of FIG. 23 on the second focusing electrode side.

28 is a front view of the second focusing electrode forming the electron gun of FIG. 23 on the first focusing electrode side. FIG.

29 is a drawing in which the horizontal lens electric field acting on the electron beam in the electron gun of FIG. 23 is replaced with an optical lens.

FIG. 30 is a diagram in which the vertical lens electric field acting on the electron beam in the electron gun of FIG. 23 is replaced with an optical lens.

FIG. 31 is a sectional view showing a modification of the electron gun of FIG. 23.

FIG. 32 is a sectional view showing another modification of the electron gun of FIG. 23.

FIG. 33 is a sectional view showing another modification of the electron gun of FIG. 23.

FIG. 34 is a front view illustrating another shape of the control electrode forming the electron gun of FIG. 23.

FIG. 35 is a sectional view showing an electron gun portion of the color picture tube according to the sixth embodiment of the present invention.

FIG. 36 is a front view of a control electrode forming the electron gun of FIG.

FIG. 37 is a front view of the first focusing electrode forming the electron gun of FIG. 35 on the second focusing electrode side.

38 is a front view of the second focusing electrode of the electron gun of FIG. 35 on the first focusing electrode side. FIG.

39 is a drawing in which the horizontal lens electric field acting on the electron beam in the electron gun of FIG. 35 is replaced by an optical lens.

40 is a drawing in which the vertical lens electric field acting on the electron beam in the electron gun of FIG. 35 is replaced with an optical lens.

41 is a cross-sectional view showing a modified example of the electron gun of FIG. 35.

42 is a cross-sectional view showing another modification of the electron gun of FIG. 35.

43 is a cross-sectional view showing another modification of the electron gun of FIG. 35.

FIG. 44 is a sectional view showing an electron gun of a color picture tube according to a seventh embodiment of the present invention.

FIG. 45 is a sectional view showing an electron gun of a color picture tube according to an eighth embodiment of the present invention.

FIG. 46 is a sectional view showing an electron gun of a color picture tube according to a ninth embodiment of the present invention.

FIG. 47 is a cross-sectional view showing a modified example of the electron gun of FIGS.

FIG. 48 is a sectional view showing another modification of the electron gun of FIGS.

FIG. 49 is a sectional view showing another modification of the electron gun of FIGS.

FIG. 50 is a sectional view showing an electron gun of a color picture tube according to a tenth embodiment of the present invention.

51 is a front view of a control electrode forming the electron gun of FIG. 50. FIG.

52 is a front view of the second focusing electrode, which is included in the electron gun of FIG. 50, on the first focusing electrode side.

53 is a front view of the first focusing electrode forming the electron gun of FIG. 50 on the side of the second auxiliary electrode. FIG.

54 is a front view of the second focusing electrode side of the first focusing electrode forming the electron gun of FIG. 50. FIG.

FIG. 55 is a front view of the second focusing electrode forming the electron gun of FIG. 50 on the first focusing electrode side.

56 is a drawing in which the horizontal lens electric field acting on the electron beam in the electron gun of FIG. 50 is replaced with an optical lens.

57 is a drawing in which the vertical lens electric field acting on the electron beam in the electron gun of FIG. 50 is replaced with an optical lens;

58 is a sectional view showing a modified example of the electron gun of FIG. 50.

59 is a cross-sectional view showing another modification of the electron gun of FIG. 50.

FIG. 60 is a sectional view showing another modification of the electron gun of FIG. 50.

FIG. 61 is a front view illustrating another shape of the electron beam passage hole of the control electrode in each embodiment of the present invention.

FIG. 62 is a front view illustrating another shape of the electron beam passage hole of the control electrode according to each embodiment of the present invention.

FIG. 63 is a front view illustrating another shape of the electron beam passage hole of the control electrode according to each embodiment of the present invention.

FIG. 64 is a sectional view showing an electron gun of a color picture tube according to a conventional example.

65 is a front view of a control electrode forming the electron gun of FIG. 64. FIG.

66 is a front view of the first focusing electrode forming the electron gun of FIG. 64 on the second focusing electrode side. FIG.

67 is a front view of the second focusing electrode forming the electron gun of FIG. 64 on the first focusing electrode side.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 cathode 2 control electrode 2a-2f, 5a-5c, 6a-6f, 7a-7c electron beam passage hole 3 acceleration electrode 4 1st auxiliary electrode 5 2nd auxiliary electrode 6 1st focusing electrode 7 2nd focusing electrode 8 final acceleration Electrode 9 Dynamic voltage generator 11 Object point 12 Cathode lens 13 Prefocus lens 14, 15 Quadrupole lens 16 Main lens

Claims (24)

[Claims] 1. An in-line color picture tube comprising an electron gun having three cathodes arranged horizontally in-line, a control electrode, an accelerating electrode, and a focusing electrode system, wherein the focusing electrode system is a predetermined one. A first focusing electrode to which a 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, wherein the first focusing electrode and the second focusing electrode pass through the electron beam. A color picture tube in which the portion has a structure that is non-axisymmetric with respect to the beam axis, and the control electrode has a non-circular electron beam passage hole that is vertically long. 2. A first auxiliary electrode and a second auxiliary electrode are provided between the accelerating electrode and the first focusing electrode, and the first focusing electrode and the first auxiliary electrode are connected by a conductor,
The color picture tube according to claim 1, wherein the second focusing electrode and the second auxiliary electrode are connected by a conductor. 3. 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. The color picture tube according to claim 2, wherein the longitudinal direction of the non-circular electron beam passage hole formed on the surface facing the electrode is vertical. 4. A first auxiliary electrode and a second auxiliary electrode are provided between the acceleration electrode and the first focusing electrode, and the first auxiliary electrode and the first focusing electrode are connected by a conductor, The color picture tube according to claim 1, wherein the second auxiliary electrode and the acceleration electrode are connected by a conductor. 5. A first auxiliary electrode and a second auxiliary electrode are provided between the acceleration electrode and the first focusing electrode, and the first auxiliary electrode and the second focusing electrode are connected by a conductor, The color picture tube according to claim 1, wherein the second auxiliary electrode and the acceleration electrode are connected by a conductor. 6. The color picture tube according to claim 1, wherein a facing portion between the acceleration electrode and the first focusing electrode has a non-axisymmetric structure. 7. The color picture tube according to claim 1, wherein said accelerating electrode has an electron beam passage hole which is elongated in the horizontal direction on the side of said first focusing electrode. 8. The color picture tube according to claim 1, wherein the first focusing electrode has an electron beam passage hole which is elongated in the vertical direction on the accelerating electrode side. 9. A first auxiliary electrode and a second auxiliary electrode are provided between the accelerating electrode and the first focusing electrode, a facing portion between the accelerating electrode and the first auxiliary electrode, and the first auxiliary electrode.
The at least one facing portion of the facing portion between the auxiliary electrode and the second auxiliary electrode and the facing portion between the second auxiliary electrode and the first focusing electrode has a non-axisymmetric structure.
A color picture tube as described. 10. The accelerating electrode has an electron beam passage hole elongated in the horizontal direction on the side of the first auxiliary electrode.
A color picture tube as described. 11. The first auxiliary electrode has an electron beam passage hole which is elongated in the vertical direction on the acceleration electrode side.
A color picture tube as described. 12. The color picture tube according to claim 1, wherein the electron beam passage hole of the control electrode is rectangular or oval. 13. An in-line color picture tube comprising an electron gun having three cathodes arranged horizontally in-line, a control electrode, an acceleration electrode and a focusing electrode system, wherein the focusing electrode system has a predetermined focus. A first focusing electrode to which a 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, wherein the first focusing electrode and the second focusing electrode include an electron beam passage unit. Has a non-axisymmetric structure with respect to the beam axis, the cathode side of the control electrode is formed with a vertical non-circular electron beam passage hole, and the control electrode side of the acceleration electrode The color picture tube has a non-circular electron beam passage hole that is long in the horizontal direction. 14. A first auxiliary electrode and a second auxiliary electrode are provided between the acceleration electrode and the first focusing electrode, and the first focusing electrode and the first auxiliary electrode are connected by a conductor, 14. The color picture tube according to claim 13, wherein the second focusing electrode and the second auxiliary electrode are connected by a conductor. 15. A longitudinal direction of a non-circular electron beam passage hole formed in a surface of the first focusing electrode facing the second auxiliary electrode is horizontal, and the first auxiliary electrode of the second auxiliary electrode is horizontal.
15. The color picture tube according to claim 14, wherein the longitudinal direction of the non-circular electron beam passage hole formed on the surface facing the focusing electrode is vertical. 16. A first auxiliary electrode and a second auxiliary electrode are provided between the acceleration electrode and the first focusing electrode, and the first auxiliary electrode and the first focusing electrode are connected by a conductor,
The color picture tube according to claim 13, wherein the second auxiliary electrode and the acceleration electrode are connected by a conductor. 17. A first auxiliary electrode and a second auxiliary electrode are provided between the acceleration electrode and the first focusing electrode, and the first auxiliary electrode and the second focusing electrode are connected by a conductor,
The color picture tube according to claim 13, wherein the second auxiliary electrode and the acceleration electrode are connected by a conductor. 18. The color picture tube according to claim 13, wherein a facing portion between the acceleration electrode and the first focusing electrode has a non-axisymmetric structure. 19. The accelerating electrode has an electron beam passage hole horizontally elongated on the first focusing electrode side.
3. The color picture tube according to 3. 20. The first focusing electrode has an electron beam passage hole which is elongated in the vertical direction on the accelerating electrode side.
3. The color picture tube according to 3. 21. A first auxiliary electrode and a second auxiliary electrode are provided between the acceleration electrode and the first focusing electrode, and a facing portion between the acceleration electrode and the first auxiliary electrode, and the first auxiliary electrode. Of the facing portion between the auxiliary electrode and the second auxiliary electrode, and the facing portion between the second auxiliary electrode and the first focusing electrode,
14. The color picture tube according to claim 13, wherein at least one facing portion has a non-axisymmetric structure. 22. The accelerating electrode has an electron beam passage hole horizontally elongated on the first auxiliary electrode side.
1. The color picture tube according to 1. 23. The first auxiliary electrode has an electron beam passage hole extending in a vertical direction on the acceleration electrode side.
1. The color picture tube according to 1. 24. The color picture tube according to claim 13, wherein the electron beam passage hole of the control electrode is rectangular or oval.