JPH04332438A - Color image-receiving tube set - Google Patents

Abstract

PURPOSE:To solve problems in accuracy in arranging an electric-field compensating electrode in a cup-shaped electrode so as to eliminate dispersion in the characteristics of a color image-receiving tube set. CONSTITUTION:An electric-field compensating electrode 160 is composed of a flange portion 162 having an opening 161 common to three electron-beams, a slide-fitting portion 163 erected from the end of the opening 161 in its horizontal direction and flat-plate-shaped eaves portions 164 putting a beam array plane therebetween, and respective portions are composed in one united body. Also a space L between the eaves portions 164 in the vertical direction is made equal to the diameter D in vertical direction of beam passage holes 136R, 136G, 136B in a cup-shaped electrode 132 wherein the electric-field compensating electrode 160 is arranged. Furthermore, there is a relation of IH>=OH between the outer diameter OH in horizontal direction of the slide-fitting portion 163 of the electric-field compensating electrode 160 and the inner diameter IH of open end of the cup-shaped electrode 132.

Description

[Detailed description of the invention]

[Purpose of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-line color picture tube device, and more particularly to a color picture tube device equipped with plate-like electrodes for improving beam shape.

0002

2. Description of the Related Art Generally, the mainstream color picture tube is of the so-called three-electron gun type. In particular, an in-line electron gun with three electron guns arranged in a row is used, and the horizontal deflection magnetic field is shaped like a pincushion as shown by the solid line in Figure 9(a), and the vertical deflection magnetic field is shaped like the pincushion shape shown in Figure 9(b). The self-convergence method, which self-converges the three electron beams B, G, and R by creating a barrel-shaped non-uniform magnetic field as shown by the solid line, is currently available as a general-purpose collar because it is possible to reduce the deflection power. It has become the mainstream of picture tube devices.

On the other hand, the above-described non-uniformity of the deflection magnetic field has the disadvantage of reducing the resolution in the peripheral area of the screen of the color picture tube device. In other words, the spot shape of the electron beam is distorted according to the deflection angle of the electron beam.
As shown in the figure, the spot shape 1 at the center of the screen is almost a perfect circle, while the spot shape 2 at the periphery of the screen is an elliptical shape long in the horizontal direction, with a high-intensity core part 3 and the vertical direction of this core part. The screen has a shape with low-luminance halo portions 4 at the top and bottom, and the resolution at the periphery of the screen is significantly reduced.

[0004] Such distortion of the electron beam spot shape occurs when the deflection yoke is
This is caused by applying a non-uniform magnetic field to the electron beam as shown in Figure 9, and the electron beam within the deflection magnetic field is weakened in focus in the horizontal direction and conversely strengthened in the vertical direction. It has become.

As a means to improve the resolution degradation caused by such deflection distortion, Japanese Patent Laid-Open No. 64-38947 and Japanese Patent Laid-open No. 1-236554 disclose a method in which the main lens section is configured as shown in FIG. A structure is shown in which plate-shaped electric field correction members 7 and 8 are arranged as electric field correction electrodes so as to have a relatively stronger focusing effect in the vertical direction than in the horizontal direction inside the cup-shaped electrodes 5 and 6. There is.

The deterioration of the resolution in the peripheral area of the screen due to the deflection distortion as described above is mainly due to the influence of the low-luminance halo area in the vertical direction. By giving a stronger focusing effect in the vertical direction than in the horizontal direction, the beam diameter in the vertical direction at the beam deflection plane becomes smaller, making it less susceptible to deflection distortion in the vertical direction.

Further, the resolution of the color picture tube device is better as the beam spot diameter on the screen is smaller, and the most effective means for achieving this is to increase the lens diameter of the electron gun. However, the electron gun has a picture tube device with a diameter of 20 m.
Since it is enclosed in a neck portion of about 30 mm to 30 mm, there is a limit to mechanically increasing the diameter.

Therefore, in Japanese Patent Publication No. 58-20093, as shown in FIG.
As one large communicating aperture common to the three electron beams, this aperture is used as a partition electrode 9 as an electric field correction electrode.
A structure is shown in which a large-diameter lens is equivalently formed by partitioning and dividing the electron beam passage holes 10R, 10G, and 10B.

In the above-described electron gun having a structure in which an electric field correction electrode is disposed inside a cup-shaped electrode forming a lens portion, means for disposing the electric field correction electrode inside the cup-shaped electrode is provided. The most common method is to weld the inside of a cup-shaped electrode.

However, as mentioned above, the electric field correction electrode controls the balance of lens action in the horizontal and vertical directions, so when such an electric field correction electrode is welded inside the cup-shaped electrode, variations in welding accuracy may occur. There is a problem of variation in characteristics. Furthermore, there may be problems such as increased costs due to the addition of a welding process, and an increase in the defective rate due to the increase in the number of parts.

[0011]

[Problems to be Solved by the Invention] As described above, in the conventional technology, the electric field correction electrode is disposed inside the cup-shaped electrode by welding, which causes variations in characteristics due to variations in welding accuracy and There are problems such as increased costs due to the addition of .

In view of the above-mentioned problems, the present invention provides a color picture tube in which an electric field correction electrode is arranged with high accuracy without being welded inside the cup-shaped electrode, and as a result, there is no variation in characteristics and no increase in cost. The purpose is to [Structure of the invention]

[0013]

Means for Solving the Problems In order to solve the above problems, the present invention provides a beam generating section that generates at least three electron beams arranged in one row, and a beam passing hole corresponding to the three electron beams. a lens portion formed by arranging a plurality of electrodes facing each other to focus these electron beams on a predetermined target; and a plurality of insulating supports for supporting the plurality of electrodes; At least one of the opposed electrodes forming the color image receiver is a cup-shaped electrode with an electric field correction electrode disposed therein to control the lens action in the horizontal and vertical directions. In the tube device, the electric field correction electrode inside at least one cup-shaped electrode forming the lens portion of the electron gun includes a flange portion having an aperture through which the three electron beams pass, and the aperture of the flange portion. The hole includes a sliding part that stands out at a substantially right angle from at least both ends in the beam arrangement direction and that slides onto the inner wall of the cup-shaped electrode, and a flat plate-like eaves part that stands out at a substantially right angle to the flange surface of the flange part. It is characterized by

[0014]

[Operation] In the present invention, the electric field correction electrode has an integral structure, and the sliding portion of the electric field correction electrode and a part of the inner wall of the cup-shaped electrode on which the electric field correction electrode is arranged slides. , the flat plate-like eaves are arranged with high accuracy inside the cup-shaped electrode, and variations in characteristics can be reduced. Furthermore, since the electric field correction electrode can be disposed using an assembly jig when assembling the electron gun, there is no need to weld it to the cup-shaped electrode in advance.

[0015]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. (Example 1)

First, the overall structure of an embodiment of the electron gun used in the color picture tube of the present invention will be explained. Figure 1
(a) is a schematic cross-sectional view in a plane direction showing one embodiment of an electron gun used in a color picture tube of the present invention. Figure 1(b)
is also a schematic sectional view in the side direction. In FIG. 1(a), an electron gun 100 has three cathodes KR, KG, KB arranged in a straight line and equipped with a heater (not shown).
First electrode 110 , second electrode 120 , third electrode 130
, fourth electrode 140 and convergence cup 15
0 are arranged in this order in the tube axis direction, and are supported and fixed by an insulating support (not shown). First electrode 1
10 is a thin plate-shaped electrode, which has three small electron beam passing holes 111R, 111G, 11 with a diameter of 1 mm or less.
1B are drilled at a certain distance. Second
The electrode 120 is also a thin plate-shaped electrode, and has three small diameter electron beam passing holes 121R, 121G, and 121G, each having a diameter of 1 mm or less.
121B are drilled at a certain distance.

The third electrode 130 is composed of two cup-shaped electrodes 131 and 132 whose open ends are in close contact with each other, and an integrated electric field correction electrode 160 disposed inside the cup-shaped electrode 132. On the second electrode 120 side of the cup-shaped electrode 131, there are three electron beam passing holes 121R, 121G, 1 formed in the second electrode 120.
Three electron beam passing holes 134R, 134G, and 134B are formed, each having a diameter slightly larger than that of hole 21B. Further, on the fourth electrode 140 side of the cup-shaped electrode 132, there are three substantially circular electron beam passing holes, each having a substantially flat plate shape without a cylindrical portion (burring) inside the beam passing hole, and having a maximum diameter of about 6 mm. 136R, 136G, and 136B are drilled.

The fourth electrode 140 is composed of two cup-shaped electrodes 141 and 142 whose open ends are in close contact with each other, and an electric field correction electrode 170 of an integral structure disposed inside the cup-shaped electrode 141. The third electrode 130 side of the cup-shaped electrode 141 has a substantially flat plate shape without burring, and the electron beam passing hole 136 of the cup-shaped electrode 132
Approximately circular electron beam passing holes 143R, 143G, and 143B similar to R, 136G, and 136B are bored. In addition, the convergence cup 1 of the cup-shaped electrode 142
Electron beam passing holes 144R, 144G, 1 are also provided on the 50 side.
44B is drilled and a convergence cup 150 is placed.

Three approximately circular electron beam passing holes 151R, 151G, and 151B with large diameters are also bored on the side of the cup-shaped electrode 142 of the convergence cup 150.
A spring 180 is attached to the tip. This spring 180 is adapted to come into pressure contact with a conductive film (not shown) coated on the inner wall of the neck in which the electron gun is enclosed.

A DC voltage of, for example, about 150 V and a modulation signal corresponding to an image are applied to the cathodes KR, KG, and KB of the electron gun 100 configured as described above. Also, the first
The electrode 110 has a ground voltage, and the second electrode 120 has a voltage of about 6
A voltage of approximately 7 kV is applied to the third electrode 130. The fourth electrode 140 includes a conductive film, a spring 180 and a convergence cup 15.
A high voltage of about 25 kV is applied across the 0. Cathode K
R, KG, KB, first electrode 110 and second electrode 12
0 to form a triode, which emits an electron beam and forms a crossover. The second electrode 120 and the third
A prefocus lens is formed near the gap between the electrodes 130 to prefocus the electron beam emitted from the triode. The main lens includes a third electrode 130 and a fourth electrode 140.
The electron beam is finally focused on the phosphor screen by this main lens.

Here, the third electrode 130 and the fourth electrode 14
The main lens formed by 0 has a focusing effect on the third electrode 130 side to which a relatively low voltage is applied, and has a diverging effect on the fourth electrode 140 side to which a relatively high voltage is applied. Since the electron beam is largely controlled by the effect on the low voltage side, the electron beam is ultimately focused on the phosphor screen.

However, the third electrode 130 and the fourth electrode 14
Electric field correction electrodes 160, 170 arranged inside the
As a result, the main lens receives both focusing and diverging effects that are relatively stronger in the vertical direction than in the horizontal direction, which is the direction in which the electron beams are arranged. In this way, the electric field correction electrodes 160, 170 control the balance between the horizontal and vertical lens actions, so the electric field correction electrodes 160, 170
70 placement accuracy is extremely important. Next, the structure of the electric field correction electrode disposed inside the cup-shaped electrode according to the present invention will be explained based on the drawings.

FIG. 2(a) shows a cup-shaped electrode 132 constituting the third electrode 130, and FIG. 2(b) shows an electric field correction electrode 160 disposed inside the cup-shaped electrode 132.
shows. The electric field correction electrode 160 of the third electrode 130 includes a flange portion 162 having an aperture 161 through which three electron beams pass in common, and a cup-shaped electrode 13 that stands out from the horizontal end of the aperture 161 at a substantially right angle to the flange surface.
2. A sliding portion 163 that slides into the interior, and a flat plate-shaped eave portion 164 that stands out from the vertical end of the opening 161 at a substantially right angle to the flange surface so as to sandwich the beam arrangement surface.
It consists of a flange part 162 and an embedding part 165 for being embedded in the insulating support body, and each part is integrally constructed. Also, the vertical interval L between the flat eaves portions 164
is the beam passing hole 136R,1 of the cup-shaped electrode 132.
It is the same as the vertical diameter D of 36G and 136B (
L=D).

Furthermore, the sliding portion 1 of the electric field correction electrode 160
There is a relationship of IH≧OH between the horizontal outer diameter OH of 63 and the horizontal inner diameter IH of the open end of the cup-shaped electrode 132, and the positioning of the electric field correction electrode 160 in the cup-shaped electrode 132 in the horizontal direction is It is carried out. Regarding vertical positioning, the vertical distance L between the flat eaves 164 is the same as the vertical diameter D of the beam passage holes 136R, 136G, and 136B of the cup-shaped electrode 132. It can be positioned in the same way as the cup-shaped electrode 132 and the like using the assembly method described above. That is, when assembling the electrodes by piling them up using an assembly jig, the horizontal positioning of the canopy part 164 is performed by the sliding part 163, and the vertical positioning is performed by the beam passing holes 136R, 136G of the cup-shaped electrode 132. ,1
This can be done by having the eaves come into contact with a rod having the same diameter as the vertical diameter D of 36B and aligning the axes of the three beams. Then, by embedding the embedded portion 135 of the cup-shaped electrode 132 and the embedded portion 165 of the electric field correction electrode 160 in the insulating support, the electric field correction electrode 160 can be disposed inside the cup-shaped electrode 132 without welding. Can be done.

Electric field correction electrode 170 of fourth electrode 140
Similarly to the case of the third electrode 130 shown in FIG. The horizontal position is determined and the vertical position can be determined using conventional techniques as described above.

In the embodiment shown in FIG. 2, the sliding portion 163 and the eaves portion 164 of the electric field correction electrode 160 stand out independently from the flange surface, but as shown in FIG. 163 may be provided around the opening 161, and a portion of the sliding portion 163 that is parallel to the beam arrangement direction and sandwiching this arrangement surface may extend in the tube axis direction to form the eaves portion 164. (Example 2)

Furthermore, in the first embodiment shown in FIGS. 2 and 3, the sliding portion of the electric field correction electrode is positioned by sliding onto the horizontal inner wall of the cup-shaped electrode, but the present invention is not limited to this. However, the positioning may be performed only in the vertical direction or in both the horizontal and vertical directions by the sliding fit.

For example, in the embodiment shown in FIG.
When the vertical diameter D of the two beam passage holes 136B, 136G, and 136R is larger (L>D), it is difficult to position the electric field correction electrode 160 in the vertical direction using the above-mentioned conventional technique. In such a case, positioning can be achieved by using the structure shown in FIG. That is, as shown in FIG. 4(b), a sliding portion 263 of the electric field correction electrode 260 is provided around the opening 261, and the vertical diameter OV of this sliding portion 263 is also a cup-shaped electrode as shown in FIG. 4(a). 132 is slidably fitted with the vertical inner diameter IV of the open end (
IH≧OH, IV≧OV) structure, and if the portion of the sliding portion 263 that is parallel to the beam arrangement direction and sandwiching this arrangement surface extends in the tube axis direction to form the eaves portion 264, the structure shown in FIG. As shown in FIG. 5, the electric field correction electrode 260 can be positioned at a predetermined position of the cup-shaped electrode 132 both horizontally and vertically.

By making the electric field correction electrode have the structure of the first and second embodiments described above, the electric field correction electrode can be placed inside the cup-shaped electrode without welding. Furthermore, since the electric field correction electrode has an integral structure that sandwiches the beam array surface from the periphery of the aperture common to the three electron beams, it can be punched and formed using a press. The present invention can be carried out even if the eaves of the electric field correction electrode are provided above and below the individual apertures corresponding to the three electron beams, but in that case, the eaves can be shaped in some way. It must be fixed, and the structure of the above embodiment is easier to manufacture. (Example 3)

In the first and second embodiments described above, the electric field correction electrode has a structure in which the electric field correction electrode has a plate-shaped eave portion parallel to each electron beam trajectory and sandwiching the electron beam trajectory. The present invention is not limited to this, and the electric field correction electrode may have any shape.

That is, as shown in FIG. 6, a sliding portion 163 stands out at a substantially right angle from the horizontal ends of the openings 161R, 161B of the flange portion 162, which has three large diameter openings 161R, 161G, 161R. and the flange portion 162 between the opening 161G and the openings 161R and 161B.
an eave portion 164 that stands approximately perpendicular to the flange surface of the
An electric field correction electrode 160 may also be provided. The cup-shaped electrode 132 has an aperture 136 common to the three electron beams.
is provided, forming an equivalent large-diameter lens. Horizontal alignment in this embodiment is performed using the sliding portion 163 as in the above-described embodiment, and vertical alignment is performed by adjusting the length L2 of the eaves portion 164 to the cup-shaped electrode 13.
This can be done by adjusting the vertical inner diameter IV of 2. Furthermore, it is also possible to provide sliding portions both horizontally and vertically for alignment. Note that the apertures provided in the cup-shaped electrode may be three individual apertures corresponding to the three electron beams, but if the aperture diameter of the cup-shaped electrode and the aperture diameter of the electric field correction electrode are different, a sliding part alignment is required. (Example 4)

[0032] In the above-described embodiments 1 to 3, a case has been described in which the cup-shaped electrode on which the electric field correction electrode is arranged is also provided with an embedding portion for embedding it in the insulating support. , as shown in FIG. 7, the cup-shaped electrode 13
2 may not be provided with an embedded portion.

For example, as shown in FIG. 8(a), a cup-shaped electrode 132 on which electric field correction electrodes 160 and 170 are disposed
, 141 , there is a risk that cracks will occur in the insulating support 200 , since there will be three embedded parts 210 , 220 embedded in the insulating support 200 , making it thicker. On the other hand, as shown in FIG. 8(b), when there is no embedded part of the cup-shaped electrodes 132, 141, the number of embedded parts 210, 220 embedded in the insulating support 200 is 2.
Therefore, cracks will not occur in the insulating support 200.

Therefore, as is clear from FIG. 8(b), the cup-shaped electrodes 131, 132 or 141, 142 adjacent to the electric field correction electrode 160 or 170
It is fine if either one of the embedded parts is not present.

Furthermore, in Examples 1 to 4 above, the case where the electric field correction electrode is provided in the main lens part of the bipotential type electron gun is described, but the type of electron gun, the position of the electrode where the electric field correction electrode is provided, etc. is not limited to the above embodiment.

[0036]In addition, Japanese Patent Application Laid-open No. 60-65433 states that
It has been proposed that an auxiliary electrode be provided inside the cup-shaped electrode to improve focus quality, but the auxiliary electrode has three circular holes, and it is easy to assemble using the holes of the conventional technology. This is different from the present invention because it can be positioned and assembled.

[0037]

As described above, in the present invention, the electric field correction electrode has an integral structure, and a part of the outer wall of the electric field correction member and the inner wall of the cup-shaped electrode on which the electric field correction electrode is disposed. By slidingly fitting the electric field correction electrode with the cup-shaped electrode, the electric field correction electrode can be accurately disposed inside the cup-shaped electrode, and a color picture tube with good characteristics can be obtained. Furthermore, since the electric field correction electrode can be disposed using an assembly jig when assembling the electron gun, there is no increase in cost due to additional welding steps.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of an electron gun in a color picture tube device of the present invention.

FIG. 2 is a perspective view showing the structure of an electric field correction electrode having a cup-shaped electrode in FIG. 1 and a canopy portion disposed inside the cup-shaped electrode and sandwiching a beam array surface.

FIG. 3 is a perspective view showing another embodiment of the cup-shaped electrode in FIG. 1 and an electric field correction electrode arranged inside the cup-shaped electrode.

FIG. 4 is a perspective view showing another embodiment of the cup-shaped electrode and the electric field correction electrode disposed inside the cup-shaped electrode according to the present invention, and showing a structure in which sliding portions are provided in both horizontal and vertical directions.

5 is a sectional view showing the overall configuration of an electron gun including the cup-shaped electrode and the electric field correction electrode shown in FIG. 4. FIG.

FIG. 6 is a perspective view showing another embodiment of a cup-shaped electrode and an electric field correction electrode disposed inside the cup-shaped electrode according to the present invention, and showing a structure having a canopy between individual openings.

FIG. 7 is a perspective view showing another embodiment of the cup-shaped electrode and the electric field correction electrode disposed inside the cup-shaped electrode according to the present invention, in which the cup-shaped electrode does not have an embedded part.

8 is a cross-sectional view of a main part illustrating how the cup-shaped electrode and electric field correction electrode shown in FIG. 6 are fixed to an insulating support.

FIG. 9 is a schematic diagram illustrating a deflection magnetic field produced by a color picture tube device.

FIG. 10 is a schematic diagram illustrating beam distortion at the periphery of the screen due to the deflection magnetic field.

FIG. 11 is a cross-sectional view showing a flat electric field correction member arranged inside a cup-shaped electrode.

FIG. 12 is a partially cutaway perspective view showing a structure in which a common aperture for three electron beams is partitioned into large-diameter individual apertures using a partition electrode.

[Explanation of symbols]

132...Cup-shaped electrodes 136R, 136G, 136B...Beam passing hole 160
…Electric field correction electrode 161 …Aperture 162 …Flange portion 163 …Sliding portion 164 …Eave portion 165 …Embedded portion L …Eave portion interval D …Vertical diameter IH of beam passage hole…Horizontal inner diameter IV of cup-shaped electrode …Vertical inner diameter of cup-shaped electrode OV…Horizontal outer diameter of sliding portion OH…Vertical outer diameter of sliding portion

Claims (1)

[Claims] 1. A beam generating unit that generates at least three electron beams arranged in one row, and a plurality of beam generating units that have beam passage holes corresponding to the three electron beams and focus the electron beams on a predetermined target. a lens part formed by opposing electrodes, and a plurality of insulating supports for supporting the plurality of electrodes, at least one of the opposing electrodes forming the lens part is , a color picture tube device equipped with an in-line electron gun, which is a cup-shaped electrode in which an electric field correction electrode for controlling horizontal and vertical lens action is disposed, at least one part forming a lens portion of the electron gun; The electric field correction electrode inside the two cup-shaped electrodes includes a flange portion having an aperture through which the three electron beams pass; 1. A color picture tube device comprising: a sliding portion that slides onto an inner wall of an electrode; and a flat eaves portion that stands substantially perpendicular to the flange surface of the flange portion.