JP2000340130A - Color cathode ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To damp vibration from the outside early without a damper wire by providing an elastic frame for fixing both ends of first and second grid element bodies to lay a color discriminating electrode in a stretched state. SOLUTION: A color discriminating electrode, that is, a grid structure body, comprises a first grid element body 23 with a groove 23g of specified width formed, and a second grid element body 24 fitted into the groove 23g. Both ends of the first and second grid element bodies 23, 24 are fixed to an elastic frame to lay the color discriminating electrode in a stretched state. With this constitution, dislocation is hardly generated between both grid element bodies 23, 24 in any way they are fitted to the frame. Since the second grid element body 24 can positively restrain the vibration of the first grid element body 23, the image quality of a color cathode-ray tube can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color cathode ray tube having an expansion mask type color selection electrode constituted by a plurality of grids.

[0002]

2. Description of the Related Art FIG. 7 is a schematic sectional view showing the structure of an extended mask type color cathode ray tube. In the figure, reference numeral 1 denotes a tube of a cathode ray tube, and a funnel 3 having a neck portion 2.
And a panel part 4 joined to the opening end face of the funnel 3.

[0005] Reference numeral 5 denotes an electron gun arranged in the neck portion 2, 6 denotes a fluorescent screen formed in a stripe shape on the inner surface of the face plate 7 of the panel portion 4, and 8 denotes an expansion mask type color selection electrode. . The spreading mask type color selection electrode 8 is arranged at a position facing the phosphor screen 6 in the panel section 4 and is constituted by a plurality of grids.

[0004] Further, reference numeral 9 denotes an electron beam emitted from the electron gun 5 and corresponding to, for example, each color of red, green and blue, and 10 denotes an electromagnetic deflection device provided at the root of the funnel 3. The electron beam 9 is deflected by the deflection control by the electromagnetic deflector 10, the arrival position on the phosphor screen 6 is determined by the color selection electrode 8, and a color image is projected by irradiating the phosphor stripe of the corresponding color. Things.

FIG. 8 is a perspective view showing an example of a spreading mask type color selection electrode. The color selection electrode 8 is provided with a pair of support rods 11 and 1 arranged in parallel with each other at a predetermined interval.
2 and a pair of elastic supports 1 attached to connect the vicinity of the left and right ends of the support rods 11 and 12 respectively.
It is stretched in a state of being extended on a frame 15 constituted by 3 and 14. That is, a pair of support rods 1
A large number of grid elements 16 parallel to each other between
Are formed, a grid structure 17 is formed, and a slit 18 is formed so that an electron beam passes between adjacent grid elements 16.

Reference numeral 19 denotes a damper wire for suppressing the vibration of the grid element body 16 when the color cathode ray tube receives an external shock or vibration. Two damper lines 19 are arranged so as to intersect the grid element body 16.
Both ends are brought into close contact with the support portion 22 of the grid structure 17 at a predetermined pressure via leaf springs 20 each having one end supported by the elastic supports 13 and 14, thereby suppressing vibration.

In a conventional color cathode ray tube using a spreading mask type color selection electrode, the shadow of the electron beam 9 due to the damper line 19 may be generated on the screen of the color cathode ray tube. In recent years, the demand for image quality and quality of a color cathode ray tube has been particularly high.
Nine shadows tend to be very noticeable.

Therefore, it is conceivable to remove such a damper wire 19, but it is necessary to provide a means that does not resonate the grid structure 17 on the color selection electrode in place of the damper wire.
In order to make the vibration of the grid structure 17 converge in a short time without using the damper wire 19, the frame 15 on which the grid body 16 is stretched may be configured more firmly. However, increasing the strength of the frame causes a problem that the weight of the frame increases.

In Japanese Patent Application Laid-Open No. Hei 7-182983, as an alternative to the damper wire 19, a color selection electrode is formed in two or more layers, and these two or more layers of color selection electrodes are attached in contact with each other. The proposal has been made.
FIG. 9 is an enlarged perspective view showing a part of the grid structure. Here, the first aperture grill 91 constituting the grid structure is mounted in the color cathode ray tube such that the upper surface is located on the face side of the color cathode ray tube and the lower surface of the second aperture grill 92 is located on the electron gun side. In addition, the second aperture grill 92 is arranged so as to have a function of reducing resonance caused by external forced vibration.

[0010]

However, in order for the above-described second aperture grille 92 to perform the function of reducing resonance, it is necessary to surely contact the first aperture grille 91. When the positional relationship between the two is shifted, there is a problem that the adhesion is reduced and the vibration damping function cannot be exhibited.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has as its object to provide a color selection electrode capable of attenuating vibrations at an early stage without a damper line when external vibrations are applied. The object of the present invention is to provide a color cathode ray tube provided with:

[0012]

SUMMARY OF THE INVENTION A color cathode ray tube according to the present invention is a color cathode ray tube provided with an extended mask type color selection electrode constituted by a plurality of grids, and a groove having a predetermined width is formed on a surface thereof. The first grid element thus obtained,
A color selection electrode is stretched in a state where the second grid body fitted into the groove on the surface of the first grid body and the first and second grid bodies are fixed by fixing both ends of the first and second grid bodies. And an elastic frame.

The first grid element may have grooves of a predetermined width formed on both surfaces, and the second and third grid elements may be fitted in the respective grooves.

Further, a groove having a predetermined width may be formed on the outer surface of the second grid element, and the third grid element may be fitted in the groove.

Further, a color cathode ray tube according to the present invention comprises:
In a color cathode ray tube provided with an extended mask type color selection electrode constituted by a plurality of grids, a first step is formed such that the plate thickness at both ends is smaller than that at the center.
, A second grid element that is extended in contact with a surface of the first grid element where a step is formed, and both ends of the first and second grid elements are fixed by welding. And an elastic frame that stretches the color selection electrode in the extended state.

Further, a groove having a predetermined width may be formed on at least one surface of the first grid element, and the second grid element may be fitted in the groove.

[0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
An embodiment of the present invention will be described.

Embodiment 1 FIG. 1 is a partial sectional view showing a color selection electrode of a color cathode ray tube according to Embodiment 1 of the present invention.

The color selection electrode according to the first embodiment, that is, a so-called grid structure, includes a first grid element 23 having a groove 23g of a predetermined width formed on the lower surface (on the side of the electron gun), A second grid element 24 fitted in a groove 23g of the grid element 23;
In the same manner as in the prior art, both ends of the grid element bodies 23 and 24 are stretched by being fixed to an elastic frame and stretched as color selection electrodes.

The elastic frame supporting the above-mentioned grid structure has the same structure as the conventional color selection electrode shown in FIG.
A pair of support rods 11 and 12 arranged at a predetermined interval in parallel and opposed to each other, and a pair of elastic support members 13 and 12 attached so as to connect the vicinity of the left and right ends of the support rods 11 and 12 respectively. 14. For the above-mentioned grid structure, a thin plate material having a thickness of 100 μm or less, for example, made of rimmed steel is used, and a large number of linear grid elements 23 and 24 forming slits 18 with a width of several 100 μm by chemical etching. Are formed in parallel.

FIG. 2 is a diagram showing a process of forming a color selection electrode of the color cathode ray tube according to the first embodiment. FIG. 3A shows a step of applying a resist film on both surfaces of the first grid element body 23. In the exposure step of FIG.
The resist film is exposed using an exposure mask having different mask patterns on the front side (the fluorescent screen side of the cathode ray tube) and the back side (the electron gun side). FIG. 3C shows a developing process, in which an etching pattern corresponding to the width of the slit 18 is formed on the front side, and the groove 23g is formed on the back side at a half interval of the slit 18.
Is formed.

As shown in FIG. 2D, the first etching is performed simultaneously from both the front and back surfaces, and ends when the groove 23g is formed to a desired depth on the back surface of the grid body 23. . Then, prior to the second etching, the groove 23g on the back surface is covered as shown in FIG. FIG. 2F shows a cross-sectional shape of the grid element body 23 at the final stage of the second etching. Here, the etching is performed only from the front surface, and the front and back surfaces penetrate, and serve as slits for transmitting the electron beam.

Finally, the first grid element 23 is completed through the steps of washing and drying (FIG. 2 (g)). Note that the second grid element body 24 can be formed by etching only from one side.

The first and second grid elements 23 and 24 are formed as described above, and the second grid element 24 is fitted into the groove 23g of the first grid element 23 so that they are in close contact with each other. In this state, an integrated grid structure 17 is formed. afterwards,
The grid structure 17 is attached to the frame 15 in the same manner as in the related art.

Here, the first grid element 23 has grooves 2
3g, and the second grid element 24 is fitted therein. Therefore, when compared to the conventional two-layer grid, no matter how the grid is attached to the frame 15, the gap between the two grid elements 24 This has the advantage of being less likely to occur.

As described above, in the color selection electrode according to the first embodiment, the grooves 23g of the first grid body 23
The second grid element 24 fitted in the inside will surely fulfill the function of suppressing the vibration of the first grid element 23, and the damper wire which has been conventionally used to reduce resonance will be used. There is no need to use it. Therefore, the projection of the shadow of the damper line on the phosphor screen is eliminated, and the first grid element 23 and the second grid element 24 are not shifted, so that a color cathode ray tube with excellent image quality can be provided.

Embodiment 2 FIG. FIG. 3 is a perspective view showing a partial cross section of a color selection electrode of the color cathode ray tube according to the second embodiment.

In the color selection electrode according to the second embodiment, a first groove 25bg having a predetermined width is formed on the lower surface (on the side of the electron gun) and a second groove 25bg having a predetermined width on the upper surface (on the side of the panel). Groove 25u
The first grid element 25 having g formed thereon, and the second and third grid elements 26 and 27 fitted into the grooves 25bg and 25ug of the first grid element 25, respectively. is there. These second and third grid element bodies 2
Both ends of 6, 27 are stretched as color selection electrodes in a state of being extended by being fixed to an elastic frame integrally with the first grid element body 25, similarly to the conventional color selection electrodes.

As described above, the color selection electrode of the second embodiment is
Since the grid element has a three-layer structure, vibration can be more effectively attenuated.

Embodiment 3 FIG. 4 is a perspective view showing a color selection electrode of a color cathode ray tube according to Embodiment 3 in a partial cross section.

The color selection electrode according to the third embodiment has grid elements 28, 29,
30 has three layers. Here, the first grid element 28 has a groove 28g with a predetermined width formed on the lower surface (on the side of the electron gun), and the second grid element has a size that fits into the groove 28g of the first grid element 28. A body 29 is formed,
A groove 29g having a predetermined width is also formed on the lower surface (on the side of the electron gun), and a third grid element 30 having a size to be fitted into the groove 29g of the second grid element 29 is formed. . These second and third grid element bodies 29, 30
Are fixed to the elastic frame integrally with the first grid element body 28 as in the case of the conventional color selection electrode, and are stretched as color selection electrodes in an extended state.

As described above, also in the color selection electrode of the third embodiment, since the grid element has a three-layer structure, vibration can be more effectively attenuated.

Embodiment 4 FIG. FIG. 5 is a perspective view showing a longitudinal end portion of a color selection electrode of the color cathode ray tube according to the fourth embodiment.

In a conventional color cathode ray tube comprising two or more layers of color selection electrodes as shown in FIG. 9, when the electrodes of each layer are welded to an elastic frame and extended, they are brought into contact with each other. No special processing was applied to both ends of the grid body. FIG. 5 shows only one longitudinal end portion, but in the fourth embodiment, the first
The grid element 31 is subjected to step processing by etching or the like so that the plate thickness at both ends is smaller than the central part. The thickness of the second grid body 32 is constant, but is bent along the step of the first grid body 31.

Therefore, when extending the color selection electrode of the fourth embodiment, the first and second grid elements 31, 32 are required.
Are integrated and fixed to the elastic frame by welding, the stepped portion of the first grid body 31 can enhance the adhesion between the two-layer grid body. Because the second grid element 32 is the first grid element 31
This is because a large frictional force is generated at the stepped portion of the color selection electrode, whereby the vibration of the color selection electrode can be effectively attenuated.

Even when three or more layers of grid elements are stacked and extended, the vibration of the color selection electrode can be effectively attenuated by forming similar steps.

Embodiment 5 FIG. 6 is a perspective view showing a longitudinal end portion of a color selection electrode of the color cathode ray tube according to the fifth embodiment.

In the fifth embodiment, the size of the two-layer grid elements 33, 34 in the width direction is different from that of the first embodiment, and one grid element 34 is replaced with the other grid element 33. It is configured to be fitted into the groove 33g formed in the above.

In this way, not only does the displacement between the grid elements in Embodiment 1 occur, but also the vibration of the color selection electrode is effectively attenuated, and a color cathode ray tube with excellent image quality can be provided.

[0040]

Since the present invention is configured as described above, it has the following effects.

According to the color cathode-ray tube according to the first to third aspects, in the color cathode-ray tube provided with the expansion mask type color selection electrode constituted by a plurality of grids, a groove having a predetermined width is formed on the surface. A first grid element,
Frame having a second grid element fitted in a groove on the surface of the grid element body, and an elastic frame on which color selection electrodes are stretched while being extended by fixing both ends of the first and second grid elements. Therefore, external vibration can be effectively suppressed based on the difference in the frictional force and the specific frequency of the grid elements that come into contact with each other. as a result,
Since the conventionally required damper line becomes unnecessary and the grid elements are less likely to be displaced at the time of resonance, inconveniences such as projection of the damper line on the phosphor screen are easily removed.
A color cathode ray with excellent image quality can be provided.

According to the color cathode ray tube according to the fourth and fifth aspects of the present invention, in a color cathode ray tube provided with an extended mask type color selection electrode constituted by a plurality of grids, the plate thickness at both ends is provided. A first grid element formed with a step so that the first element is thinner than the central part, and a second grid element extended in contact with the surface of the first grid element where the step is formed, Since both ends of the first and second grid elements are fixed by welding, and an elastic frame that stretches the color selection electrodes in an extended state is provided, friction between the grid elements placed in contact with each other is provided. By increasing the force, external vibrations can be effectively suppressed. As a result, conventionally required damper lines become unnecessary, and the grid elements are less likely to be displaced at the time of resonance, so that inconveniences such as projection of the damper lines on the phosphor screen can be easily removed. A color cathode ray with excellent image quality can be provided.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing a color selection electrode of a color cathode ray tube according to a first embodiment.

FIG. 2 is a diagram showing a step of forming a color selection electrode of the color cathode ray tube according to the first embodiment.

FIG. 3 is a perspective view partially showing a color selection electrode of a color cathode ray tube according to a second embodiment;

FIG. 4 is a perspective view, partially in section, of a color selection electrode of a color cathode ray tube according to a third embodiment.

FIG. 5 is a perspective view showing a longitudinal end of a color selection electrode of a color cathode ray tube according to a fourth embodiment.

FIG. 6 is a perspective view showing a longitudinal end of a color selection electrode of a color cathode ray tube according to a fifth embodiment.

FIG. 7 is a schematic cross-sectional view showing the structure of an expansion mask type color cathode ray tube.

FIG. 8 is a perspective view showing an example of a spreading mask type color selection electrode.

FIG. 9 is an enlarged perspective view showing a part of a conventional grid structure.

[Explanation of symbols]

1 cathode ray tube, 2 neck, 3 funnel, 4 panel, 5 electron gun, 6 phosphor screen, 7
Face plate, 8 color selection electrode, 9 electron beam, 10 electromagnetic deflector, 15 frame, 16
Grid body, 17 Grid structure, 19 Damper line, 22 Support, 23, 25, 28, 31, 3
3 First grid element, 23g, 25bg, 25u
gw, 28g, 29g, 33g Groove, 24, 26, 2
9, 32, 34 Second grid element, 27, 30
Third grid element.

Claims (5)

[Claims] 1. A color cathode ray tube provided with an expansion mask type color selection electrode constituted by a plurality of grids, wherein: a first grid element body having a groove of a predetermined width formed on a surface thereof; The second fitted into the groove on the surface of the grid body
A color cathode ray tube, comprising: a grid element body; and an elastic frame on which the color selection electrode is stretched while being extended by fixing both ends of the first and second grid elements. . 2. The first grid element has a groove having a predetermined width formed on both surfaces thereof, and a second and a third grid element are fitted in the respective grooves. The color cathode ray tube according to claim 1. 3. A groove having a predetermined width is formed on an outer surface of the second grid element, and a third grid element is fitted in the groove. Or a color cathode ray tube according to any of 2. 4. A color cathode ray tube provided with an extended mask type color selection electrode constituted by a plurality of grids, wherein a step is formed such that the plate thickness at both ends is smaller than that at the center. A grid element, a second grid element that is extended in contact with a surface of the first grid element where a step is formed, and welding both ends of the first and second grid elements by welding A color cathode ray tube, comprising: an elastic frame that fixes and extends the color selection electrode in an extended state. 5. The first grid element, wherein a groove having a predetermined width is formed on at least one surface of the first grid element, and a second grid element is fitted in the groove. 5. The color cathode ray tube according to 4.