JP3409951B2 - Color picture tube equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electron gun for a color picture tube, which is configured to obtain a high resolution over the entire screen of a phosphor screen.

[0002]

2. Description of the Related Art The resolution characteristics of a color picture tube device largely depend on the size and shape of a beam spot. In order to obtain high resolution, the electrodes must be configured so that a small diameter circular beam spot is generated, but the electron beam diameter passing through the electric field of the main lens of the electron gun increases as the beam current increases, The beam spot is further enlarged due to the spherical aberration of the electric field of the main lens. Therefore, it is necessary to increase the diameter of the electric field of the main lens as much as possible to reduce the influence of spherical aberration.

In a color picture tube device disclosed in Japanese Patent Application Laid-Open No. 55-17963, as shown in FIG. 7, a tubular body 3 having an elliptic cross section and a tube provided at a position retracted inward from its open end. By forming the focusing electrode 1 with the one shield plate 4, the three in-line-arranged electron beams are separated. Similarly to the focusing electrode 1, the final accelerating electrode 2 separates the three electron beams by the two shield plates 6 provided at positions retracted inward from the opening end of the tubular body 5 having an oval cross section. There is. At this time, in the focusing electrode 1 and the final accelerating electrode 2, the three main lens electric fields overlap each other, so that a large-diameter main lens electric field can be generated. For this reason, even if the diameter of the beam passing through the electric field of the main lens increases as the current increases, the adverse effect of spherical aberration can be reduced.

[0004]

With such a structure, the diameter of the main lens electric field can be increased without enlarging the neck diameter, but there is a limit to this. If the maximum outer diameter of the focusing electrode and the final accelerating electrode is increased to a value close to the inner diameter of the neck portion of the glass bulb, the wall electric field of the neck glass portion penetrates into the main lens and adversely affects it. Further, when the diameter of the neck portion is increased, the deflection sensitivity is reduced.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a color picture tube device in which the aperture of the electric field of the main lens of the electron gun is further enlarged without increasing the diameter of the neck of the glass bulb to further improve the resolution. It is in.

[0006]

The features of the first color picture tube device according to the present invention for achieving the above object are that a focusing electrode to which a focus voltage is applied and a final accelerating electrode to which an anode voltage is applied are provided. between, resistance layers are formed,
Has the same inner diameter as the focusing electrode and the final accelerating electrode
A cylindrical insulator surrounding the three electron beams has a high voltage equal to or lower than the anode voltage on the final acceleration electrode side of the resistance layer, and equal to or higher than the focus voltage on the focusing electrode side. Is applied, and three electron beam passage holes arranged in-line are respectively provided on the end faces of the focusing electrode and the final accelerating electrode facing the insulator.

[0007]

As another configuration, three in-line arrangements are used.
The present invention is also applicable to a structure using electrode means such as a shield plate instead of the end plate having one electron beam passage hole. That is, the second color picture tube device according to the present invention is
Each of the final accelerating electrode focusing electrode and the anode voltage off Okasu voltage is applied is applied, it consists tubular body surrounding the three electron beams are in-line arranged three main field in the interior of the cylindrical body in the configuration in which the electrode means for separating the lens field is provided, between the final accelerating electrode and the focusing electrode, resistor layers are formed, the
A cylindrical insulator having an inner diameter equivalent to that of the focusing electrode and the final accelerating electrode is disposed so as to surround the three electron beams, and a high voltage equal to or lower than the anode voltage is applied to the final accelerating electrode side of the resistance layer. However, a low voltage equal to or higher than the focus voltage is applied to the focusing electrode side .
It

A third color picture tube device according to the present invention comprises:
Focusing electrode to which focus voltage is applied and anode voltage
A resistive layer was formed between the applied final acceleration electrode
Arranged so that a cylindrical insulator surrounds the three electron beams
The anodization is performed on the final acceleration electrode side of the resistance layer.
High voltage equal to or lower than the ground voltage is applied to the focusing electrode side.
A voltage lower than or equal to the focus voltage is applied.
The focusing electrode and the uppermost electrode facing the insulator.
Three electrons arranged inline on the end face of the final accelerating electrode
Beam passing holes are provided respectively, and the insulator is
Formed by applying an insulating coating to the surface of a conductor such as metal
It is characterized by being made. According to the invention
A focus voltage is applied to the color picture tube device of No. 4.
The focusing electrode and the final accelerating electrode where the anode voltage is applied.
Each has three electron beams arranged in-line.
It consists of a cylindrical body that encloses an electric field inside the cylinder.
Electrode means for separating the lens electric field is provided,
A cylinder having a resistance layer formed between the electrode and the final accelerating electrode.
-Shaped insulator is placed so as to surround the electron beam.
And the anode voltage is applied to the final acceleration electrode side of the resistance layer.
A high voltage equal to or less than that of the voltage on the focusing electrode side
Okasu voltage equal to or higher than lower voltage is applied, the
Insulator has an insulating coating on the surface of conductor such as metal
It is characterized by being formed by applying.

A fifth color picture tube device according to the present invention comprises:
Focusing electrode to which focus voltage is applied and anode voltage
A resistive layer was formed between the applied final acceleration electrode
Arranged so that a cylindrical insulator surrounds the three electron beams
The anodization is performed on the final acceleration electrode side of the resistance layer.
High voltage equal to or lower than the ground voltage is applied to the focusing electrode side.
A voltage lower than or equal to the focus voltage is applied.
The focusing electrode and the uppermost electrode facing the insulator.
Three electrons arranged inline on the end face of the final accelerating electrode
Beam passing holes are provided respectively, and the insulator is
Two or more are provided, and the in-line is placed between each insulator.
Auxiliary electrode having three electron beam passage holes arranged in parallel
A plate is arranged, the auxiliary electrode plate and the resistance layer of the insulator on both sides
And are electrically connected. The present invention
The sixth color picture tube device according to
Focusing electrode applied and final acceleration applied with anode voltage
Each of the electrodes has three electronic wires arranged in-line.
It consists of a cylinder that surrounds the dome, and an electric field is
Electrode means for separating the three main lens electric fields are provided,
A resistance layer is formed between the focusing electrode and the final accelerating electrode.
So that a cylindrical insulator surrounds the electron beam
An anode is disposed on the final acceleration electrode side of the resistance layer.
High voltage equal to or lower than the ground voltage is applied to the focusing electrode side.
A low voltage equal to or higher than the focus voltage is applied.
Two or more of the above-mentioned insulators are provided, and each insulator
3 electron beam passage holes arranged in-line between
Auxiliary electrode plate having is arranged, said auxiliary electrode plate and both sides
Is electrically connected to the resistance layer of the insulator of
To collect.

[0011]

According to the above-described structure of the present invention, the overlapping portions of the three main lens electric fields have the same electric field as the conventional one, and the potential distribution on the Z axis in the main lens electric field region has a gentle gradient. Therefore, it becomes possible to reduce the spherical aberration of the electric field of the main lens. Further, it is possible to prevent the wall electric field at the neck portion of the glass bulb from invading the main lens forming region by the shield effect of the insulator. In this way, the beam spot diameter is smaller, so that a higher resolution can be obtained with the phosphor screen.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 3, the color picture tube device according to the present embodiment has three cathodes 1 arranged inline on the neck portion 18a of the glass bulb 18.
5, an electron gun including a control electrode 16, a focusing electrode, a final accelerating electrode 8 and the like. The electrode configuration of the main lens portion of this electron gun is shown in FIG. 1 and 3 are sectional views seen from the upper surface of the picture tube.

As shown in FIG. 1, in the electron gun of the color picture tube device according to the present embodiment, an insulator 9 is provided between the focusing electrode 7 and the final accelerating electrode 8, whereby an in-line type is provided. The main lens is constructed. 2A and 2B are front views of the focusing electrode 7 and the insulator 9 as seen from the Z-axis direction.

The focusing electrode 7 has three beam passage holes 10a to 10c arranged inline on the end face 10 on the insulator 9 side, and the central hole 10b has an elliptical shape having a major axis in a direction perpendicular to the inline direction. Is formed in. Final accelerating electrode 8
Also has three beam passage holes 12a to 12c arranged inline on the end face on the insulator side, and the central hole 12b has an elliptical shape having a long axis in the direction perpendicular to the inline direction.

The insulator 9 is a cylinder that surrounds the three electron beams, and has a resistor layer 14 having a high resistance value (hereinafter referred to as "high resistance layer") 14 on its inner surface. The high resistance layer 14 is
For example, as shown in FIG. 8, it is formed in a spiral shape from the final acceleration electrode side to the focusing electrode side. And the resistance layer 1
One end side 14a of 4 is electrically connected to the focusing electrode 7, and the other end side 14b is connected to the final acceleration electrode 8. As a result, the following lens electric field is formed.

Since the insulator 9 is a cylinder that surrounds the three electron beams, a lens electric field common to the three electron beams is formed inside the insulator 9. Further, as shown by a solid line in FIG. 6, the potential distribution on the Z axis in the electric field of the main lens has a gentler gradient than that shown by a conventional broken line. The synergistic effect of these two actions significantly expands the effective lens aperture. In FIG. 6, Z = 0 is the Z of the insulator 9.
At the midpoint in the axial direction. The beam passing holes 10a to 10c and 12a to 12c arranged in line on the respective end faces of the focusing electrode 7 and the final accelerating electrode 8 separate the lens electric field into three lens electric fields, and depending on the shape of the holes, the in-line direction (X The lens focusing power in the axial direction) and the direction perpendicular to the axial direction (Y-axis direction) is adjusted. Further, since the wall electric field of the neck portion 18a (FIG. 3) is shielded by the insulator 9, it is possible to prevent the main lens electric field from being adversely affected.

Next, in the second embodiment shown in FIG. 4, the end surfaces 30 of the focusing electrode 27 and the final accelerating electrode 28, respectively.
The difference from the first embodiment is that the electrodes 32 and 32 are retracted inward of the electrodes. Even with such a configuration, the basic effects are the same as in the case of the first embodiment. Of course, only one of the end faces 30 or 32 may be retracted. Conversely, of either or both of the end faces 30 and 32,
You may make at least one part of an end surface project inside an insulating cylinder. Further, instead of using an end face plate having three holes arranged in-line as the electrode means for separating the lens electric field into three, two shield plates as shown in FIG. 7 may be used.

Next, in the third embodiment shown in FIG. 5, two insulators 4 are provided between the focusing electrode 47 and the final accelerating electrode 48.
9, 51 are provided, and an auxiliary electrode plate 50 having beam passage holes arranged in-line is provided therebetween. The auxiliary electrode plate 50 and the resistance layers 54 and 55 of the insulators on both sides are electrically connected. This auxiliary electrode plate facilitates the balance adjustment of the lens focusing power in the in-line direction and the direction perpendicular thereto, and effectively enlarges the regions of the resistance layers 54 and 55 formed in the insulator in the Z-axis direction. The potential distribution in the Z-axis direction can be made gentler to further enlarge the lens aperture. The insulator may be divided into three or more pieces by using two or more auxiliary electrode plates.

The present invention is not limited to the main lens formed by the focus voltage and the anode voltage, but is applicable to general electric field lenses for color picture tubes.
Further, the insulator may be at least a portion adjacent to the resistance layer on the inner surface of the insulator, and may be, for example, one obtained by subjecting a metal surface to a treatment such as an insulating coating. Further, the resistance layer does not necessarily have to be formed in a spiral shape as long as a high resistance value can be obtained in the Z-axis direction.

[0021]

As described above, according to the present invention, in addition to the structure in which the three main lens electric fields are adjacent to each other, the gradient of the axial potential distribution of the main lens portion becomes gentle. Due to the synergistic effect of these two actions, the effective main lens aperture is remarkably enlarged, and spherical aberration and lens magnification are both reduced, so the beam spot diameter can be made smaller and a high resolution is obtained on the phosphor screen. be able to.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration of a main lens unit in a color picture tube device according to a first embodiment of the present invention.

FIG. 2 is a front view of a focusing electrode and an insulator, which form the lens unit of FIG. 1, viewed from the Z-axis direction.

FIG. 3 is a sectional view of the main part of the color picture tube device shown in FIG. 1, as seen from above.

FIG. 4 is a cross-sectional view showing a configuration of a main lens portion in the color picture tube device according to the second embodiment.

FIG. 5 is a cross-sectional view showing a configuration of a main lens portion in a color picture tube device according to a third embodiment.

FIG. 6 is a graph showing the Z-axis potential distribution of the main lens portion in comparison with the conventional one and the one according to the present invention.

FIG. 7 is a sectional view and a front view showing the configuration of a main lens portion of a conventional color picture tube device.

FIG. 8 is a diagram showing an example of a structure of a resistance layer.

[Explanation of symbols]

1,7,27,47 Focusing electrode 4,6 Shield plate 2,8,28,48 Final accelerating electrode 9,29,49,51 Insulator 14, 34, 54, 55 Resistance layer 50 Auxiliary electrode plate

Continuation of front page (56) Reference JP-A-60-205945 (JP, A) JP-A-4-370632 (JP, A) JP-A-3-152834 (JP, A) JP-A-61-224402 (JP) , A) JP-A 1-225044 (JP, A) JP-A 60-208027 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01J 29/48 H01J 29/62

Claims (4)

(57) [Claims] 1. A cylindrical insulator having a resistance layer formed between a focusing electrode to which a focus voltage is applied and a final accelerating electrode to which an anode voltage is applied is arranged so as to surround three electron beams. A high voltage equal to or lower than the anode voltage is applied to the final acceleration electrode side of the resistance layer, and a low voltage equal to or higher than the focus voltage is applied to the focusing electrode side, and the insulator is applied to the insulator. Three electron beam passage holes arranged inline are provided respectively on the end faces of the focusing electrode and the final accelerating electrode which face each other, and the insulator is formed by applying an insulating coating treatment to the surface of a conductor such as metal. A color picture tube device characterized in that 2. Each of the focusing electrode to which the focus voltage is applied and the final accelerating electrode to which the anode voltage is applied are
It is composed of a cylindrical body that surrounds three electron beams arranged in-line, and an electrode means for separating an electric field into three main lens electric fields is provided inside the cylindrical body, and between the focusing electrode and the final accelerating electrode. Is a cylindrical insulator on which a resistance layer is formed so as to surround the electron beam, and at the final acceleration electrode side of the resistance layer, a high voltage equal to or lower than an anode voltage is applied to the focusing electrode side. Is applied with a voltage lower than or equal to the focus voltage, and the insulator is formed by subjecting the surface of a conductor such as metal to an insulating coating treatment. 3. A cylindrical insulator having a resistance layer formed between a focusing electrode to which a focus voltage is applied and a final accelerating electrode to which an anode voltage is applied is arranged so as to surround three electron beams. A high voltage equal to or lower than the anode voltage is applied to the final acceleration electrode side of the resistance layer, and a low voltage equal to or higher than the focus voltage is applied to the focusing electrode side, and the insulator is applied to the insulator. Three electron beam passage holes arranged inline are respectively provided on the end faces of the focusing electrode and the final accelerating electrode which face each other, and two or more of the insulators are provided, and the inline is provided between the respective insulators. A color image receiving device, in which an auxiliary electrode plate having three arranged electron beam passage holes is arranged, and the auxiliary electrode plate and the resistance layers of insulators on both sides are electrically connected. Apparatus. 4. Each of the focusing electrode to which the focus voltage is applied and the final accelerating electrode to which the anode voltage is applied are
It is composed of a cylindrical body that surrounds three electron beams arranged in-line, and an electrode means for separating an electric field into three main lens electric fields is provided inside the cylindrical body, and between the focusing electrode and the final accelerating electrode. Is a cylindrical insulator on which a resistance layer is formed so as to surround the electron beam, and at the final acceleration electrode side of the resistance layer, a high voltage equal to or lower than an anode voltage is applied to the focusing electrode side. Is applied with a voltage lower than or equal to the focus voltage, two or more insulators are provided, and an auxiliary electrode plate having three electron beam passage holes arranged in-line is arranged between the insulators. A color picture tube device, wherein the auxiliary electrode plate and the resistance layers of the insulators on both sides are electrically connected.