JPS58152349A - Slot mask for color cathode-ray tube - Google Patents

Abstract

PURPOSE:To get rid of a defect in a product in time of metalforming by a press, by making the minimum opening width of each fine slit and vertical bridge width between fine slits at both sides of a horizontal shaft differ from that of these fine slits at the central part side, in case of a slot mask provided with a lot of fine slits in rectangular form. CONSTITUTION:A slot mask 5 formed in rectangular externals carrying a lot of rectangular fine slits 9 at the specified intervals is disposed on a phosphor screen 2 of a panel 1a. In addition, the slot mask 5 is molded by means of press forming in a way that makes width W2 of a vertical bridge 10 between fine slits 9 at both sides of its horizontal shaft X larger than width W1 of the vertical bridge between fine slits 9 positioned at the central part side and that makes minimum opening width D2 of each fine slit 9 at the end part smaller than opening width D1 at the central part side. Therefore, a crack in the vertical bridge 10 in time of press work can be obviated while an extension of the minimum opening width D2 of each line slit 9 is no longer increased beyond the opening width D1 and a failure in press work can shrink to nothing; thus color slippage can be lessened.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shadow mask installed in a color cathode ray tube, and more particularly to a slot mask having rectangular pores through which electron beams pass.

FIG. 1 is a partially cutaway side view of a conventional color cathode ray tube. In this figure, (1) is a glass bulb, and a fluorescent film (2) is formed on the inner surface of the panel part (ia) of this glass bulb (1), and an electronic film is formed inside the neck part (1b). A gun (3) is enclosed. (4) is - child gun (3
) is a deflection yoke that deflects the electron beam emitted from the funnel (1o) side of the neck (1b). (5) is a slot mask placed in the same manner as the fluorescent film (2).
) is supported by the mask frame (6), and is also supported by a panel pin (8) provided on the inner surface of the skirt part of the panel part (1 &) by the mask frame (6) clip (7). . The slot mask above (
5) is provided with a large number of rectangular pores (9) through which the electron beam passes, as shown in FIG. In Figure 2,
and Y are the mask horizontal and vertical axes.

FIG. 6 is a partially enlarged view of the slot mask (5), FIG. 4 is a sectional view taken along line A-A in FIG. 6, and FIG.
-B sectional views are shown respectively. Figure 4.

As can be seen from FIG. 5, the opening (9a) of the pore (9) on the fluorescent film side is larger than the opening (9b) on the d-gun side.

This means that for a deflection angle of the electron beam of 1, the electron beam (il-) is S in order to properly irradiate the fluorescent film without blocking it.
0) is the longitudinal bridge between pores tll) and L9), the 6th
In Figure 4, -(11) is the pore (9), (9
) is the Maki Bridge between.

In the above configuration, the minimum opening width of the pore (9) is set to DC6.
Fig. 4), and the vertical bridge width is W (Fig. 6).

(Fig. 5), D = 0.150 to 0.20, W = 0.08 to 0.130, and the dimensions are constant over the entire slot mask, or 14C
1 slot mask, as shown in Table 1, there are several grades.

1 Table 1) The slot mask (5) is molded to have a predetermined spherical surface and is equipped with a G-shaped mask frame (6), a spring clip (γ), and a Hanel pin (8) as shown in Figure 1.
K is firmly supported at a predetermined position within the glass bulb (1) through the glass bulb (1). was.

In other words, due to the characteristics of press molding, the slot mask (5)
The amount of extension in the peripheral part is thicker than in the central part (particularly noticeable at the outermost periphery at both ends of the mask horizontal axis Cracking occurred, and as a result, the minimum opening width DC of the pores (9) (FIG. 6) was abnormally enlarged, posing the risk of reducing the material yield due to poor pressing. This problem cannot be solved by adjusting the mold during pressing, and is extremely difficult to solve. Also, as a completed slot mask (5), a panel pin (8
) is assembled into a glass bulb (
1), the slot mask (5) formed into a predetermined spherical surface was not able to maintain its shape sufficiently due to the holes in the process, especially when the 1 m screen of a color cathode ray tube was installed. There was a drawback that color shift occurred on the edges.

The object of the present invention is to overcome the above-mentioned drawbacks and to provide a complete slot mask for color cathode ray tubes with less press defects and color shift.

Hereinafter, embodiments of the present invention will be described with reference to Drawing G.

FIG. 6 is a partially cutaway front view of a color cathode ray tube slot mask (5) according to a one-shot embodiment of the present invention. In this figure, parts corresponding to those shown in FIG. 6 are given the same reference numerals.

In No. 61iJ, the vertical bridge width W from the mask horizontal mX edge of the slot mask (5) and the second row from the outermost periphery of the perforation, and the vertical bridge width W in the direction of the center of the mask where it touches
, the minimum opening width of the pore (9) is increased with respect to ,
The holes D and D were made the same, and the dimensions were constructed as shown in Table 2 using a 14-inch slot mask.

(Table 2) In this slot mask (5) - the minimum opening of the pore (9) is 1ilIiilD in normal press molding! Although the width of the opening was larger than the minimum opening width of the periphery, no cracks were observed in the vertical bridge (10), and it remained at a level that would not cause any practical problems, and even when installed inside a color cathode ray tube. Sufficient spherical strength was obtained compared to the conventional one.

Further, another embodiment will be described with reference to FIG.

FIG. 7 shows that the vertical bridge width W from the mask horizontal axis x end of the slot mask (5) to the second row from the outermost periphery of the perforation is increased relative to the vertical bridge width W in the direction of the center of the adjacent mask, and The minimum opening width Dzk of the pore (9) is decreased from the same D1, and its dimensions are shown in Table 6 using a 14p1 slot mask.
It was structured as follows.

C Table 3) In this slot mask (5), there is no cracking of the vertical bridge (10) during normal press forming - the extension of the minimum opening width D2 of the pore (9) is also different from that of the peripheral part! Even when installed in a color cathode ray tube, there was little color shift at the periphery of the screen, and sufficient spherical strength was obtained.

The present invention is not limited to the above two embodiments, and it is possible to operate only the first row from the mask horizontal axis x end of the slot mask (5) and the outermost periphery of the valve hole, as well as to operate the small hole width. It goes without saying that sufficient effects can be expected even when operated alone.

According to the experimental results, this invention is a slot mask (5)
At least one of the minimum opening width D of the pores (9) up to approximately the fifth row from the outer circumference of the number of perforations at both ends of the horizontal axis X, and the vertical bridge width W between the pores (9) and (9), are It has been found that the desired purpose can be achieved by reducing the minimum opening width D'r in the direction of the center of the mask, the li bridge width W, by 5μ or more, or by increasing it by 10μ or more in one vertical fringe depression W. did.

As explained above, according to the present invention, pressing defects of the slot mask are prevented, so the material yield is greatly improved, and the strength of the peripheral area of the mask is increased, so the mask shape is sufficiently maintained and the color is An excellent color cathode ray tube with little deviation can be obtained.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway side view of a conventional color cathode ray tube, Fig. 2 is a simplified configuration diagram of a conventional slot mask, Fig. 5 is a partially enlarged view of a conventional slot mask, and Fig. 4 is the same as Fig. 6. A
-A sectional view, Figure 5 is a BB sectional view of Figure 6,
1iJ is a partial front view of a slot mask for a color cathode ray tube according to an embodiment of the invention, and FIG. 7 is a partial front view of a slot mask according to another embodiment of the invention. (2)...fluorescent film, f8)...-subgun, (5)...
・Slot master (9)... Pore, (9a)...
Fluorescent film measurement aperture, (9b)...electron gun side port, D.
...Minimum opening width, W...Vertical bridge width -X...Mask horizontal axis. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Agent Makoto Kuzuno - (1 other person) Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 +z

Claims (1)

[Claims] (1) 'In a slot mask for a color cathode ray tube, in which a large number of rectangular pores are bored through which the magneton beam passes, and the opening of the pores on the fluorescent film side is enlarged from the opening on the electron gun side. , at least one of the minimum opening width of the pores from the outermost periphery of the perforation part at both ends of the mask horizontal axis, and the width of the vertical bridge between the pores, and the minimum opening width of the pores toward the center of the adjacent mask. From width and vertical bridge width, minimum opening width 5
A slot mask for a color cathode ray tube, characterized in that the vertical bridge width is decreased by more than 10μ or increased by 10μ or more.