JPH05266822A - Color picture tube device - Google Patents

Abstract

PURPOSE:To improve the lens electric field characteristic and improve assembling precision in a color picture tube device having four focusing electrodes and deflecting the electron beams on both sides to the inside with the pre- focused lens electric field. CONSTITUTION:Electron beam passing holes 9a, 9c on both sides of the first focusing electrode 4 have a center axis mutual interval A and are formed into an oblong shape having the major axis in the horizontal direction, and electron beam passing holes 10a, 10c on both sides of the second focusing electrode 5 have a center axis mutual interval B and are formed into an oblong shape having the major axis in the horizontal direction. Electron beam passing holes 11a, 11c on both sides of an accelerating electrode 3 have a center axis mutual interval C, and the relation C<A>B is satisfied. The assembling precision of electrodes can be improved while the electron beams on both sides are deflected to the inside by the pre-focused lens electric field. The electron beams on both sides deflected to the inside can be guided to the center section of the electron beam passing holes 10a, 10c on both sides of the second focusing electrode 5.

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 device provided with an in-line type electron gun having a focusing electrode divided into four in the tube axis direction.

[0002]

2. Description of the Related Art A color picture tube device in which a focusing electrode is divided into four in the tube axis direction is disclosed in JP-A-3-93135 and JP-A-3-95835. In such a color picture tube device, a control grid electrode, an accelerating electrode, a first focusing electrode to which a constant focus voltage is applied, and a deflection angle of an electron beam are sequentially arranged in the tube axis direction from three cathodes arranged inline in the horizontal direction. The second focusing electrode to which a dynamic voltage gradually increasing from the focus voltage is applied, the box-shaped third focusing electrode connected to the first focusing electrode, and the box connected to the second focusing electrode. Type 4
The focusing electrode and the anode are arranged. Then, three axially asymmetric lens electric fields are generated between the first focusing electrode and the second focusing electrode, and 3 is generated between the third focusing electrode and the fourth focusing electrode.
Generates a two-axis asymmetric lens electric field.

This axially asymmetric lens electric field is not generated when the same focus voltage is applied to all the focusing electrodes, that is, when the deflection angle of the electron beam becomes zero. Even if it is horizontally long, it has no effect on the electron beam. However, the axially asymmetric lens electric field generated as the deflection angle of the electron beam is distorted vertically distorts the cross-sectional shape of the electron beam, so that the cross-sectional shape of the electron beam passing through the self-convergence deflection magnetic field is The horizontal distortion can be canceled out, and high resolution can be obtained even in the peripheral portion of the phosphor screen. Further, as the deflection angle of the electron beam increases, the potential difference between the fourth focusing electrode and the anode decreases, and the lens action of the in-lens weakens. Therefore, overfocusing due to deflection of the beam spot can be solved at the same time. .. It is also possible to prevent the occurrence of moire.

A color picture tube having a convergence structure in which electron beams on both sides are swung inward by a prefocus electric field on both sides is disclosed in Japanese Patent Publication No. 1-292999. In the color picture tube constructed in this way, unlike the conventional configuration in which the electron beams on both sides are swung inward by the main lens electric fields on both sides, if the three main lens electric fields on the center and both sides are axially symmetric, In particular, it is possible to improve the assembly accuracy of the electrodes in the main lens electric field generator.

[0005]

By the way, in a color picture tube device in which the focusing electrode is divided into four in the tube axis direction,
If an electron beam on both sides is to be swung inward by the prefocus lens electric field generated between the acceleration electrode and the first focusing electrode, it is particularly difficult to position the prefocus lens electric field generator during electrode assembly. become. This is because, in order to swing the electron beams on both sides inward by the electric field of the prefocus lens, the distance between the central axes of the electron beam passage holes on both sides of the first focusing electrode is set to the electron beam passage holes on both sides of the acceleration electrode. It must be set larger than the mutual distance between the central axes of. But,
If the electron beam passage holes on both sides of the acceleration electrode and the electron beam passage holes on both sides of the first focusing electrode are both circular, a pair of rod-shaped pins of the electrode assembly jig cannot be inserted therethrough. Further, when the electron beam passage holes on both sides of the second focusing electrode are circular and coaxial with the electron beam holes on both sides of the first focusing electrode, the electron beams on both sides swung inward by the prefocus electric field are The two focusing electrodes cannot be guided to the respective centers of the electron beam passage holes on both sides. In particular, since a dynamic voltage is applied to the second focusing electrode, there is a risk that the electron fields on both sides are undesirably deflected by the lens electric field generated between the first focusing electrode and the second focusing electrode.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, in which electron beam passage holes on both sides of the end surface of the first focusing electrode on the accelerating electrode side are provided with A
It has a horizontally long shape in which the major axes are arranged in the horizontal direction with the mutual center axes spaced apart from each other. In addition, the second focusing electrode is formed in a box shape, and the electron beam passage holes on both sides of the end surface of the first focusing electrode on the side of the first focusing electrode have a horizontally long shape in which the major axes are arranged in the horizontal direction at intervals of B center axes. Eggplant When the distance between the central axes of the electron beam passage holes on both sides of the acceleration electrode is C, the relationship of C <A> B is established.

[0007]

With this structure, the electron beam passage holes on both sides of the end surface of the first focusing electrode on the side of the acceleration electrode and the second focusing electrode are formed.
Even if the electron beam passage holes on both sides of the end face of the focusing electrode on the first focusing electrode side are eccentric to each other, they have a horizontally elongated shape, so that the electron beam passage holes on both sides of the accelerating electrode are connected to both sides of the second focusing electrode. You can see through the electron beam passage hole. That is, the pair of rod-shaped pins can be inserted from the electron beam passage holes on both sides of the second focusing electrode through the electron beam passage holes on both sides of the first focusing electrode into the electron beam passage holes on both sides of the acceleration electrode. , These electrodes can be positioned with high precision. Further, since the second focusing electrode is box-shaped, a desired quadrupole lens electric field can be generated between the third focusing electrode side end surface and the third focusing electrode.

[0008]

The present invention will be described below with reference to the illustrated embodiments. As shown in FIGS. 1 and 2, the three cathodes 1a, 1b, 1c arranged inline in the horizontal direction are composed of a control grid electrode 2, an acceleration electrode 3 and a fixed electrode arranged in sequence in the tube axis direction. A plate-shaped first to which a focus voltage is applied
Focusing electrode 4, a box-shaped second focusing electrode 5 to which a dynamic voltage that gradually increases from the focus voltage with an increase in the deflection angle of the electron beam is applied, and a box-shaped third focusing electrode 4 connected to the first focusing electrode 4. An in-line type electron gun is configured with the focusing electrode 6, the box-shaped fourth focusing electrode 7 connected to the second focusing electrode 5, and the anode 8. Electron beam passage holes 9a on both sides of the end surface of the first focusing electrode 4 on the acceleration electrode side,
9c is a laterally long shape having a major axis in the horizontal direction with a mutual center axis distance A, and has electron beam passage holes 10a on both sides of the end surface of the second focusing electrode 5 on the side of the first focusing electrode.
10c has a horizontally long shape with a long axis extending in the horizontal direction with a mutual spacing of B center axes. And the acceleration electrode 3
Letting C be the distance between the central axes of the electron beam passage holes 11a and 11c on both sides, the relationship C <A> B is satisfied.

The electron beam passage hole 9b in the center of the first focusing electrode 4, the electron beam passage hole 10b in the center of the end face of the second focusing electrode 5 on the side of the first focusing electrode and the electron beam passage hole 11b in the center of the acceleration electrode 3 are formed. Both are circular.
Further, the electron beam passage holes 12a, 12 on both sides and the center of the end surface of the second focusing electrode 5 on the side of the third focusing electrode are formed.
Each of b and 12c has a vertically elongated shape with a long axis in the vertical direction, and the electron beam passage holes 1 on both sides and the center of the end surface of the third focusing electrode 6 on the second focusing electrode side.
Each of 3a, 13b, and 13c has a horizontally long shape with a long axis in the horizontal direction. Then, as the deflection angle of the electron beam increases, a quadrupole lens electric field is generated between the second focusing electrode 5 and the third focusing electrode 6.

A constant acceleration voltage of 300 V to 500 V is applied to the acceleration electrode 3, and a constant focus voltage Vf of several KV is applied to the first focusing electrode 4 and the third focusing electrode 6. Then, the second focusing electrode 5 and the fourth focusing electrode 7 are applied with a dynamic voltage that gradually increases from the focus voltage Vf as the deflection angle of the electron beam increases. As described in Japanese Patent Publication No. 3-60147, this dynamic voltage changes in the range of several hundred V in synchronization with horizontal deflection. A constant high voltage Va of about 25 KV is applied to the anode 8.

In the electrode assembly of such an electron gun, as shown in FIG.
Also, as shown in FIG. 4, the pair of rod-shaped pins 14 and 15 of the electrode assembly jig 13 are inserted into the electron beam passage holes on the side of each electrode.

[0012]

As described above, according to the present invention, the electron beam on both sides is swung inward by the electric field of the prefocus lens generated between the accelerating electrode and the first focusing electrode. The electrodes in the electric field generator can be assembled accurately, and moreover, the electron beams on both sides swung inward by the prefocus electric field can be guided to the central axes of the electron beam passage holes on both sides of the second focusing electrode. You can

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of an in-line type electron gun of a color picture tube device embodying the present invention.

FIG. 2 is a side sectional view of the same in-line type electron gun.

FIG. 3 is a perspective view showing a relationship between the electron gun and a pair of rod-shaped pins of an electrode assembly jig.

FIG. 4 is a front view of an electrode assembly jig.

[Explanation of symbols]

 3 Acceleration electrode 4 1st focusing electrode 5 2nd focusing electrode 6 3rd focusing electrode 7 4th focusing electrode 8 Anode 9a-9c Electron beam passage hole 10a-10c Electron beam passage hole 11a-11c Electron beam passage hole

Claims (1)

[Claims] 1. A control grid electrode, an acceleration electrode, a plate-shaped first focusing electrode to which a constant focus voltage is applied, and a deflection of an electron beam sequentially from three cathodes arranged inline in the horizontal direction in the tube axis direction. A box-shaped second focusing electrode to which a dynamic voltage gradually increasing from the focus voltage is applied as the angle increases, a box-shaped third focusing electrode connected to the first focusing electrode, and a second focusing electrode. Box-shaped 4th connected
A focusing electrode and an anode are arranged, and the electron beam passage holes on both sides of the end surface of the first focusing electrode on the side of the acceleration electrode have a horizontally long shape having a major axis in the horizontal direction with a center axis mutual distance A. None, the electron beam passage holes on both sides of the end surface of the second focusing electrode on the side of the first focusing electrode have a horizontally long shape in which the long axes are arranged in the horizontal direction with the central axes of B being mutually spaced apart. A color picture tube device having a relationship of C <A> B, where C is the distance between the central axes of the electron beam passage holes on both sides.