JPH11345575A - Color sorting electrode structure of cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color sorting electrode structure having a structure such that the amount of fluctuation in open width of a slit at the outermost end is seldom affected by the configuration of the distribution of tensions applied to an aperture grill. SOLUTION: This color sorting electrode structure has an aperture grill 4 consisting of a pair of first frame members, a pair of second frame members extended between the first frame members, and a metal sheet, with a number of slits 3 of microwidth arranged in parallel over almost the entire surface of the sheet and with an unperforated part 7b of a predetermined width formed along each outermost end slit 3A. Each edge of the aperture grill 4 in the extending direction of the slits is secured to the first frame members and the aperture grill 4 is exerted by the second frame members with tension in the extending direction of the slits. In this case, the unperforated part 7b is provided at its upper and lower ends with cut parts 6 each of which is cut by a predetermined length from its outer edge toward the slit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color selection electrode structure for a cathode ray tube, and more particularly to a color selection electrode structure having a structure in which tension is applied to a color selection electrode, in which the opening width of the outermost slit is suppressed from varying. The present invention relates to a sorting electrode structure.

[0002]

2. Description of the Related Art In a general color cathode ray tube, a color selection electrode structure is arranged between an electron gun and a phosphor so that an electron beam emitted from the electron gun reaches only a predetermined phosphor. ing. There are several types of structures of this color selection electrode structure, one of which is a structure called an aperture grill having a large number of slit-like pores stretched over an elastic frame. . FIG. 2 is a schematic view showing a stretchable color selection electrode structure and a phosphor screen, FIG. 3 is an explanatory view showing a state in which a conventional aperture grill has been stretched, and FIG. 4 is a tension applied to a non-porous portion of the aperture grill. It is explanatory drawing which shows an example of distribution. In FIG. 2, reference numeral 1 denotes a phosphor stripe of each color of red, green, and blue, and reference numeral 2 denotes a color phosphor screen in which the phosphor stripes 1 are arranged in parallel in a predetermined order. Reference numeral 3 denotes a slit formed in the aperture grill in parallel to the phosphor stripe 1, and reference numeral 4 denotes an aperture grill made of a thin metal plate, and a number of slits 3 having a small width are arranged in parallel. The slit 3 is formed by, for example, chemical etching. The opening width of the slit 3 is usually 60 to 100 μm. Reference numeral 5 denotes a frame, and a pair of opposing frame portions (frame H members) 5A and this frame portion 5A
Pair of arms (frame V member)
5B.

As shown in FIG. 3, right and left outermost end slits 3A are provided on the left and right sides of a portion 7a of the aperture grill 4 where a number of slits 3 are arranged in parallel.
A non-porous portion 7b is provided along. This non-porous part 7
b limits the effective screen when a phosphor stripe is printed on the phosphor screen 2, and its width is usually 3.8.
〜4.5 mm. Furthermore, the aperture grill 4
The slit 3 is fixed to the frame 5 by welding both edges in the extension direction, that is, both edges in the vertical direction to the frame 5A. At the time of the above welding, the frame 5A is held in a state where it is bent in the direction of drawing toward each other, and after the aperture grill 4 is welded to the frame 5A, the frame 5 is released. A predetermined tension in the slit extension direction is applied to the aperture grill 4.

[0004]

In the above-described conventional color selection electrode structure, when a predetermined tension is applied by releasing the holding of the frame 5 after the aperture grille 4 is welded, the outermost portions of the two are separated. Depending on the shape of the tension distribution applied to the non-porous portion 7b, the opening width at the center of the end slit 3A may be wider than the other slits 3 as shown in FIG. Sometimes. This is because a moment is generated in the non-porous portion 7b by the shape of the tension distribution, and the opening width fluctuates in the direction of the moment. FIG. 4 shows an example of the tension distribution applied to the non-porous portion 7b. Here, in the non-porous portion 7b, as shown by 8a and 8b, an example of a tension distribution in which the outer tension is larger than the inner tension is shown. Is shown.

Here, the hole shape of the outermost end slit 3A of the aperture grill 4 before the tension is applied is designed so that the opening width of the outermost end slit 3A becomes a predetermined value after the tension is applied. Therefore, since the opening width of the outermost end slit 3A fluctuates (increases or decreases) depending on the distribution of tension applied to the aperture grill 4, it is difficult to design the hole shape of the outermost end slit 3A before applying the tension. There was a problem. Also, in consideration of the fluctuation of the tension, it is difficult to make the opening width of the outermost end slit 3A a predetermined value by mass production.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has been made in view of the vertical and non-porous portions having a predetermined width formed along both outermost end slits of a number of slits arranged in parallel. By providing a notch portion cut out from the outer edge toward the slit by a predetermined length at the end portion, a structure in which the amount of variation in the opening width of the outermost end slit is less affected by the tension distribution applied to the aperture grille is provided. It is an object to obtain a color selection electrode structure of a cathode ray tube having the same.

[0007]

A color selection electrode of a cathode ray tube according to the present invention comprises a pair of first frame members, and a pair of second frame members inserted between the first frame members.
And a thin metal plate in which a number of minute width slits are arranged in parallel on almost the entire surface, and a non-porous portion having a predetermined width is formed along the slits at both outermost ends in the arrangement direction of the slits. A color selection electrode structure including a color selection electrode, wherein both edges of the color selection electrode in the slit extension direction are fixed to the first frame member, and tension is applied to the color selection electrode in the slit extension direction by the second frame member. In the body, a cutout portion having a predetermined length cutout is provided at both ends of the non-porous portion of the color selection electrode in a direction intersecting the extending direction of the slit from the outer edge thereof.
The length of the notch is set to be 0.3 times or less the width of the non-porous portion. Further, the length of the cutout portion is set to be 0.2 to 0.3 times the width of the non-porous portion.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a plan view showing a main part of the first embodiment of the present invention. 1, the same parts as those in FIGS. 2 to 4 are denoted by the same reference numerals, and description thereof will be omitted. Reference numeral 6 denotes a rectangular cutout provided at the upper and lower ends of the non-porous portion 7b. The notch 6 is formed by cutting the upper and lower ends of the non-porous portion 7b of the aperture grill 4 by a predetermined length from the outer edge of the non-porous portion 7b in a direction orthogonal to the outermost end slit 3A. . The position of the notch 6 in the vertical direction is an extension of both ends in the vertical direction of the perforated portion including the outermost end slit 3A. Therefore, for example, when the length of the outermost end slit 3A is 292 mm, the cutouts 6 are provided at intervals of about 292 mm. According to the first embodiment, by providing the rectangular notch 6 having a predetermined length at the upper and lower ends of the non-porous portion 7b, the tension difference in the width direction of the non-porous portion 7b is reduced. That is, in the tension distribution examples 8a and 8b shown in FIG. 4, the tension difference is small. Therefore, the moment generated in the non-porous portion 7b by the tension distribution is reduced, so that the variation in the opening width of the outermost end slit 3A can be reduced.

Hereinafter, the results of an experiment which has confirmed the above points will be described. The experiment was performed as follows. The aperture grill 4 has a thickness of 0.1 mm.
A rectangular notch 6 was provided at the upper and lower ends of b (width 4 mm). The distribution shape of the tension applied to the non-porous portion 7b of the aperture grill 4 in the vertical direction is 0.4 kgf lower than the inner tension of the non-porous portion 7b, and 2.1 kgf higher. The amount of variation in the opening width at the center of each outermost slit 3A was examined for each of the two types. The rectangular notch 6 is provided at the upper and lower ends of the non-porous portion 7b in a direction orthogonal to the opening of the outermost end slit 3A, and has a length of 0.4 to 1.6 mm. The width of the shape notch is 0.6 mm. Table 1 shows an example of the result. In the table, the sign of the opening width of the outermost end slit 3A is “+” because the opening width at the center of the outermost end slit 3A is larger than the opening width at both ends. It means the opposite is true. The unit is μm.

[0010]

[Table 1]

According to Table 1, when the length of the rectangular cutout 6 is 1.2 mm or less, that is, 0.3 times or less the width of the non-porous portion 7b, the outermost end slit 3A due to a change in tension distribution.
It can be seen that the amount of variation in the opening width is smaller than the amount of variation (171 μm) when there is no rectangular cutout. Further, the length of the notch 6 is 1.6 mm, that is, the non-porous portion 7
It can be seen that when the width is larger than 0.3 times the width of b, the fluctuation amount becomes larger than the fluctuation amount when there is no rectangular cutout. Therefore, the outermost end slit 3A is provided by providing the rectangular cutout portion 6 having a length of 0.3 times or less the width of the non-porous portion 7b.
The aperture grille 4 whose opening width is hardly affected by the change in the tension distribution can be obtained. In particular, it is appropriate that the length of the rectangular notch 6 is 0.2 to 0.3 times the width of the non-porous portion 7b.

According to the above results, by providing the rectangular notch 6 in a direction orthogonal to the outermost end slit 3A, it is possible to adjust the tension so that the opening width of the outermost end slit 3A after applying the tension becomes a predetermined value. It becomes easy to design the hole shape of the outermost slit 3A of the aperture grill 4 before the application. Also,
The above results are obtained when the width of the non-porous portion 7b is 4 mm,
Also when the width of the non-porous portion 7b is 3.8 mm or 4.5 mm, the length is 0.3 times or less, preferably 0.2 times the width of the non-porous portion 7b.
The same result was obtained by providing the notch 6 of about 0.3 times. Further, a notch 6 having a width of 0.6 mm is provided.
However, similar results were obtained with the aperture grille 4 provided with linear cuts instead of the cutouts 6. Although the notch 6 is provided in a direction orthogonal to the slit, the same effect can be obtained by providing the notch 6 in a direction crossing the slit toward the slit.

[0013]

As described above, the present invention comprises a pair of first frame members, a pair of second frame members interposed between the first frame members, and a metal thin plate. A large number of slits of minute width are arranged in parallel on the entire surface and a color selection electrode having a non-porous portion having a predetermined width is formed along both outermost end slits, and both edges of the color selection electrode in the slit extending direction are provided. In the color selection electrode structure fixed to the first frame member and tension applied in the slit extending direction to the color selection electrode by the second frame member, the color selection electrode is formed at the upper and lower ends of the non-porous portion, and from the outer edge to the slit. The opening width of the outermost end slit is hardly affected by the shape of the tension distribution applied to the non-porous portion, since the notch portion cut out toward the predetermined length is provided, and the opening width is reduced. Momentum can obtain a small color selection electrode structure. Therefore, by using this color selection electrode structure, a color cathode ray tube having good image quality characteristics can be manufactured.

Further, since the length of the notch is set to be 0.2 to 0.3 times the width of the non-hole, the variation of the opening width of the outermost end slit is further reduced. be able to.

[Brief description of the drawings]

FIG. 1 is a plan view showing a main part of a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing a stretchable color selection electrode structure and a phosphor screen.

FIG. 3 is an explanatory view showing a state after a conventional aperture grill is stretched.

FIG. 4 is an explanatory diagram showing an example of a distribution of tension applied to a non-porous portion of an aperture grill.

[Explanation of symbols]

3 slit, 3A outermost end slit, 4 aperture grille, 6 notch, 7b non-porous part.

Claims (3)

[Claims] 1. A pair of first frame members, a pair of second frame members spanned between the first frame members, and a large number of minute-width slits arranged in parallel over substantially the entire surface. A color selection electrode made of a thin metal plate having a non-porous portion having a predetermined width formed along the slit at both outermost ends in the arrangement direction of the slit is provided. In a color selection electrode structure fixed to one frame member and tension applied in the slit extension direction to the color selection electrode by the second frame member, at both ends of a non-porous portion of the color selection electrode, A color selection electrode structure for a cathode ray tube, wherein a cutout portion cut out from the outer edge by a predetermined length in a direction intersecting with the extending direction of the slit is provided. 2. The length of the notch is equal to 0.
2. The color selection electrode structure for a cathode ray tube according to claim 1, wherein the value is set to three times or less. 3. The length of the notch is equal to 0.
2. The color selection electrode structure for a cathode ray tube according to claim 1, wherein the number is set to 2 to 0.3 times.