JPH10199406A - Manufacture of color selection electrode - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the dispersion of resonance frequencies to avoid resonance with outside vibration and make production easy by pressing a frame part from the inside to the outside, and pressing the vicinity of the joining point of the frame part from the inside to the outside to deform the whole frame. SOLUTION: An elastic bottom supporting part 7 of a frame 3 is depressed from the inside to the outside, and the vicinity of the joining point of a metal thin plate holding frame part 6 is depressed from the outside to the inside. As the depressing point of the elastic bottom supporting frame part 7, a plurality of depressing points may be set in addition to the central point of the elastic bottom supporting frame part 7 for more uniform deformation. The metal thin plate holding frame part 6 is uniformly deformed, tension applied to an electrode is made almost uniform, and the dispersion of resonance frequency is reduced. Since the elastic bottom supporting frame part 7 is depressed from the inside, the interference of a fixing device for fixing the electrode with a pressing device for applying the depressing force is not produced, and the production is made relatively easy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a color selection electrode formed by applying a tension to the entire electrode, and more particularly to a method for obtaining a uniform tension distribution, a small variation in resonance frequency, and a reduction in external vibration. The present invention relates to a method of manufacturing a color selection electrode which does not cause resonance of a screen and has little disturbance of a screen.

[0002]

2. Description of the Related Art As shown in FIG. 1, a color selection electrode 1 (hereinafter, simply referred to as an electrode 1) is a thin metal plate 2 made of a substantially square plate-like member having a plurality of rows of striped slits 4 formed therein. And a substantially quadrangular frame 3 supporting the frame. The frame 3 is formed by joining a frame portion (hereinafter, referred to as a metal sheet holding frame section 6) joined and fixed to both side edges 5, 5 orthogonal to the slits 4 of the metal sheet 2 and a metal sheet holding frame section 6, elastically. And a supporting frame portion (hereinafter, referred to as an elastic floor frame portion 7).

As a method of manufacturing the electrode 1, the method shown in FIG. 6 has conventionally been exclusively employed. That is, as shown in FIG.
9, the pressing tools 8, 9 are pressed inward from the outside to deform the frame 3, and then the thin metal plate 2 is mounted on the frame 3, and the side edge 5 of the thin metal plate 2 is mounted. , 5 are welded to the metal sheet holding frame portions 6, 6 of the frame 3. Then, the pressing force by the pressing tools 8 and 9 is released. Pressing tool 8,
Since the deformation of the frame 3 is released by the release of 9, the desired tension can be applied to the metal thin plate 2. In FIG. 6, the pressing points of the pressing tools 8 and 9 are two places,
By pressing many points, the deformation of the frame 3 can be made uniform.

There are a number of known techniques relating to a method for manufacturing the electrode 1. For example, Japanese Patent Publication No. 55-40978 discloses a "method for stretching a wire of a grid", and Japanese Patent Application Laid-Open No. 8-3697.
No. 0, "Pressure Apparatus for Aperture Grill Frame" and Japanese Patent Application Laid-Open No. 7-94085, "Method for Manufacturing Pressing Element for Color Separation Electrode Welding of Cathode Ray Tube and Color Selection Mechanism". These known techniques have their respective features, and the pressing means of the frame also has their respective features. However, all the pressing points are equivalent to the arc-shaped frames 6 and 6 described above. .

[0005]

In the case of the above-mentioned prior art and known art, since there is a pressing point in the metal sheet holding frame portions 6 and 6 as shown in FIG. 6, as shown in FIG. The frame 3 is deformed (in the drawing, the two-dot chain line indicates the frame 3 before pressing, and the solid line indicates the frame 3 after pressing.
Is an extreme representation of the deformation state of That is, in the portion of the metal sheet holding frame portion 6, the portion at the pressing point is greatly deformed, and the other portions are less deformed, and the deformed state in each portion varies. These local deformations of the frame 3 may remain on the electrode 1 as unevenness on the mask surface. Then, when heat or external force is applied in the subsequent manufacturing process, the tape may be twisted or deformed.
Incidentally, the twist and deformation of the tape are the main causes of the mislanding of the electron beam. In addition, the metal sheet 2
When the pressure is released and the pressing force is released, the tension applied to the metal sheet 2 greatly differs depending on the position. This difference in tension is expressed as a difference in resonance frequency.

A curve B shown by a dotted line in FIG. 4 shows the resonance frequency at each position in the related art manufactured by the above-described manufacturing method. That is, when the horizontal axis indicates the distance [mm] from the center of the electrode 1 and the vertical axis indicates the resonance frequency, the resonance frequency greatly changes as shown in FIG.
Further, if there is a variation in the resonance frequency, there is a problem that one of the resonance frequencies is likely to resonate with the vibration given from the outside, and the electrodes are vibrated and the screen is disturbed. Therefore,
In order to obtain high-quality electrodes, there is a demand for a manufacturing method in which the deformation of the frame is smooth and the variation of the resonance frequency is minimized.

The present invention has been made in view of the above-mentioned demands, and provides a method of manufacturing a color selection electrode in which resonance frequency fluctuations are reduced, resonance with external vibrations is reduced, and manufacturing is facilitated. The purpose is to do.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a thin metal plate having a plurality of rows of striped slits formed therein, and both side edges of the thin metal plate orthogonal to the slits. And a substantially quadrangular frame having a frame portion holding the thin metal plate and a frame portion elastically supporting the frame portion, wherein the frame portion is moved from inside to outside. And pressing the frame portion from outside to inside to deform the entire frame.
A second procedure of mounting the thin metal plate on the deformed frame and fixing the frame portion and the thin metal plate, and a second step of releasing the pressing force of the frame portion and the frame portion. The method is characterized by a method of manufacturing a color selection electrode, which sequentially performs the steps 3 and 4. More specifically, the pressure point of the frame portion is a center point of the frame portion, and the pressure point of the frame portion is composed of many points.

In the method of manufacturing a color selection electrode according to the present invention, the portion of the elastic floor frame portion 7 of the frame 3 is pressed from the inside to the outside, and the vicinity of the joining point of the metal sheet holding frame portion 6 is moved outward. And press inward. The pressing point of the elastic supporting frame portion 7 may be the center point of the elastic supporting frame portion 7, but it is desirable to provide a plurality of pressing points in order to further improve the uniformity of deformation. By the above pressing, the metal sheet holding frame portion 6 is deformed more uniformly than in the case of the conventional technique, and the tension applied to the electrode becomes almost constant,
Variation in resonance frequency is reduced. Further, by simultaneously pressing the elastic supporting frame 7 and the thin metal plate holding frame 6, the tension of the tape of the color selection electrode held on the welding position of the frame 3 is brought to the same level as the tension of the other portions. The effect of being uniform is obtained. Further, the fixing device for fixing the electrode for pressing from the inside of the elastic floor frame portion 7 does not interfere with the pressing device for applying the pressing force, and the manufacturing can be relatively easily performed.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for manufacturing a color selection electrode according to the present invention will be described in detail with reference to the drawings. The method of manufacturing a color selection electrode according to the present invention includes a first procedure of roughly deforming a frame, and a step of mounting a thin metal plate on the deformed frame and welding both side edges of the thin metal plate to the thin metal sheet holding frame portion. 2
And a third procedure for releasing the pressing force applied to the frame. Among the above procedures, the present invention is characterized by the method of pressing the frame in the first procedure. In addition,
As shown in FIG. 1, the frame 3 includes metal sheet holding frame portions 6, 6 and elastic supporting frame portions 7, 7 for elastically supporting them.
The thin metal plate 2 forming the slit 4 is mounted on the frame 3 and welded.

As shown in FIG. 2, in the method for manufacturing a color selection electrode according to the present invention, a pressing force 10 is applied to the center point of the elastic supporting frame portions 7,7. Any type of pressurizing device may be used as the pressurizing device for generating the pressing force 10, but a device that acts on the center points of the left and right elastic floor frames 7 at the same time and applies the same pressing force is employed. Is done. Further, in the present invention, as shown in FIG. 2, a pressing force 13 is applied to a corner of a connecting portion between the thin metal plate holding frame 6 and the elastic supporting frame 7. There are four corners, and the pressing force 13 is simultaneously applied to the four corners with the same force. The pressing force 13 acts on the frame 3 from the outside to the inside.

FIG. 3 shows an extreme display of the deformed state of the frame 3 when the pressing force 10 is applied to the center point in FIG. In the figure, a two-dot chain line shows the contour shape of the frame 3 before deformation, and a solid line shows the deformation shape of the frame 3 after deformation. With only the pressing force 10 applied to the elastic supporting frame portion 7, the deformation of the thin metal plate holding frame portion 6 is slightly different in each portion.
However, the application of the pressing force 13 reduces the deformation difference of each part of the thin metal sheet holding frame part 6, and becomes almost the same. That is, as is apparent from the figure, the portion of the metal sheet holding frame portion 6 of the frame 3 is smoothly deformed without unevenness,
The variation in the amount of deformation is relatively small.

A solid line A shown by a solid line in FIG. 4 indicates the resonance frequency of each part of the electrode 1 manufactured by the method for manufacturing a color selection electrode of the present invention. As is apparent from the figure, the value of the resonance frequency is substantially constant regardless of the distance from the center. Also, the absolute value of the resonance frequency is lower than that of the prior art. Therefore, by setting the resonance frequency of the electrode 1 to a value that does not resonate with the frequency of external vibration, it is easy to prevent any part of the electrode 1 from resonating with external vibration. As described above, the disturbance and darkening of the screen can be reliably prevented.

FIG. 5 shows still another embodiment of the method for manufacturing a color selection electrode according to the present invention. In the method of manufacturing the color selection electrode described above, the pressing point of the elastic floor frame 7 is only the center point, but in this example, the point of pressing the elastic floor frame 7 at a plurality of points is different. Of course, as shown, the pressing force 13 acts on the four corners of the frame 3 from the outside to the inside. In the drawing, two sets of pressing tools 12 each having two pressing elements 11 are provided, and the elastic supporting frame portion 7 is pressed by the four pressing elements 11. Of course, the number of pressing tools 12 and pressing elements 11 is not limited to this example. By providing the pressing points at a plurality of positions, the deformation of the elastic supporting frame portion 7 is made uniform, and accordingly, the deformation of the metal sheet holding frame portion 6 is made uniform. This allows
The resonance frequency can be made even more uniform.

[0015]

【The invention's effect】

1) According to the method for manufacturing a color selection electrode according to the first aspect of the present invention, a manufacturing method is employed in which the frame is deformed by pressing the elastic supporting frame portion and the thin metal sheet holding frame portion. , Variations in electrode tension are reduced,
Uniformity can be achieved with little variation in resonance frequency. This prevents screen disturbance and darkening. In addition, since the pressurizing device of the frame and the fixing device of the electrode do not interfere with each other, the handleability during manufacture is good, and the manufacture can be facilitated and speeded up.

2) According to the method for manufacturing a color selection electrode according to the second aspect of the present invention, since the pressurization of the frame is performed at the center point of the elastic supporting frame portion, the structure of the pressurizing device is simplified. Is done.

3) According to the method for manufacturing a color selection electrode according to the third aspect of the present invention, since the pressing point of the elastic supporting frame portion extends to a plurality of locations, the deformation of the frame is further uniformed, and the resonance frequency is reduced. Variation is reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a color selection electrode having a metal sheet welded to a frame.

FIG. 2 is a schematic view showing a method of pressing a frame in the method of manufacturing a color selection electrode according to the present invention.

FIG. 3 is a schematic diagram showing deformation of the frame when pressing force acts on four corners of the frame and a center point of the elastic supporting frame portion.

FIG. 4 is a diagram showing a variation in resonance frequency in a method for manufacturing a color selection electrode according to the present invention and a conventional manufacturing method.

FIG. 5 is a schematic diagram showing a method for manufacturing a color selection electrode of the present invention in which the frame is directly pressed at four corners and a plurality of positions of the frame.

FIG. 6 is a schematic view showing a conventional method for manufacturing a color selection electrode.

FIG. 7 is a schematic diagram showing a deformation of a frame in a conventional method for manufacturing a color selection electrode.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Color selection electrode (electrode), 2 ... Metal thin plate, 3 ... Frame, 4 ... Slit, 5 ... Side edge part, 6 ... Metal thin plate holding frame part (frame part), 7 ... Elasticity Supporting frame part (frame part), 8 ... pressing tool, 9 ... pressing tool,
10 pressing force, 11 pressing element, 12 pressing tool, 1
3 ... Pressing force.

Claims (3)

[Claims] 1. A thin metal plate having a plurality of rows of striped slits formed therein, a frame portion which is joined to both side edges of the thin metal plate orthogonal to the slits and holds the thin metal plate, and a frame portion which is elastic. A method of manufacturing a color selection electrode comprising a substantially quadrangular frame having a supporting frame portion and a frame portion, wherein the frame portion is pressed inward from the inside and the frame portion is pressed inward from the outside. A first procedure of deforming the entire frame by applying pressure, a second procedure of mounting the thin metal plate on the deformed frame and fixing the frame portion and the thin metal plate, and the frame section And a third step of releasing the pressing force of the frame portion. 2. The method according to claim 1, wherein the pressing point of the frame portion is a center point of the frame portion. 3. The method as claimed in claim 1, wherein the pressurizing points of the frame portion are composed of a number of points.