JPS5918550A - Color cathode-ray tube - Google Patents

Abstract

PURPOSE:To reduce color discrepancy by a method wherein, regarding drilling arrangement on the corner part of a shadow mask, the more approaching the prescribed row in the direction of a vertical row from the outermost peripheral position of the drilling part, the minimum opening width in the horizontal direction of the mask is gradually reduced or the vertical bridge width is gradually increased. CONSTITUTION:Regarding the drilling arrangement on the corner part linking the long side and the short side of the drilling surface of a shadow mask 5, the vertical bridge width W2, for instance, up to the second row in the direction of a vertical row from the outermost periphery of the drilling part is increased as against the vertical bridge width W1 in the direction of the horizontal axis X of the neighboring mask, while the minimum opening width D in the direction of the horizontal axis of a thin hole 9 is set up about equal to D1 D2. Further, the vertical bridge width W2 up to the second row in the direction of the vertical row from the outermost periphery of the drilling part is increased as against the vertical bridge width of to be continued the neighboring one in the direction of the neighboring mask horizontal axis X, besides the minimum opening width D2 of the thin hole can be reduced as against the opening width D1 in order to be formed. In this way, the defective at the time of press molding of the mask 5 can be checked thus improving a material yield and mechanical strength also reducing color discrepancy on the peripheral part of the picture screen.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a color cathode ray tube in which a shadow mask has rectangular holes for passing electron beams.

FIG. 1 shows the configuration of a conventional color cathode ray tube.

In the figure, (1) is a glass bulb, and a fluorescent surface (2) is formed on the inner surface of the panel portion (1&) of this glass bulb (1), and a fluorescent surface (2) is formed inside the neck portion (1b). An electron gun (8) is enclosed. (4) is a deflection yoke that deflects the electron beam emitted from the electron gun (8);
It is provided on the outer periphery of the neck portion (1b) on the funnel portion (10) side. (5) is a shadow mask disposed opposite to the fluorescent surface (2), the peripheral skirt portion of this shadow mask (5) is supported by a frame (6), and the frame (6) is supported by a spring clip. (7), the panel part (1
aM) Panel bin (8) installed on the inner surface of the skirt part
is supported by The shadow mask (5) has a second
As shown in the figure, there are many rectangular pores (9) through which the electron beam passes.
(See Figure 3). In Figure 2,
is the horizontal axis, Y is the vertical axis, and 2 is the diagonal axis.

As is clear from FIGS. 4 and 5, the pore (9) is formed so that the opening (9&) on the fluorescent surface side is larger in diameter than the opening (9b) on the electron gun side. This is to ensure that the electron beam is properly irradiated onto the fluorescent surface (2) without being obstructed at the deflection angle of the electron beam. Figures 6-5
In the figure, (to) is a vertical bridge between pores (9) and (9) - 01) is a horizontal bridge between pores (9) and (9).

In the primary configuration, the minimum opening width of pore (9) is set to DC 6th.
Fig. 4), and the vertical bridge width w (Fig. 3).

(Fig. 5), D-0.150 to 0.200 tone and W = 0.08 to 0.130 are usually set, and the dimension △ is constant over the entire shadow mask, or 14
An example of an inch shadow mask has several grades as shown in Table 1.

Table 1 By the way, the shadow mask (5) is press-molded to have a predetermined spherical surface, and as shown in FIG.
The frame (6), spring clip (7), and panel pin (8) are jointly supported at a predetermined position within the glass bulb (1), but conventionally, the glass bulb (1) is However, it had the following drawbacks. In other words, due to the nature of press molding, the amount of elongation at the periphery of the shadow mask (1) tends to be larger than that at the center, especially at the mask diagonal axis (2) (Figure 2) and the four corner edges. It appears conspicuously at the outermost periphery of the vertical bridge n
o) Cracks occur in the (Fig. 6) section, resulting in pores (9
) is abnormally enlarged, and the minimum opening width D (Fig. 6) of material 1
The yield was decreasing. This is a problem that is difficult to solve with press molds, design, mold adjustment, etc. Also, as a completed shadow mask (5), Bunnelby”-(
When the glass bulb (11) is assembled into a glass bulb (11) after going through various processes, it is able to sufficiently maintain its predetermined spherical shape due to various impacts during the process. There was a drawback that color shift occurred in some areas.

This invention was made to eliminate the above drawbacks.
By adjusting at least one of the horizontal minimum opening width of the pores of the shadow mask and the bridge width between the pores, it is possible to completely suppress the occurrence of shadow mask molding defects and create a color cathode ray tube with less color shift. is intended to provide.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 6 is a partially cutaway front view of a color hidden line diagram according to an embodiment of the present invention. In this figure, parts corresponding to those shown in FIG. 6 are given the same reference numerals. In FIG. 6, there is a line 5 connecting the long and short sides of the perforated surface of the shadow mask (5). Regarding the perforation arrangement of m o (including the diagonal axis Zf) (Fig. 2), the vertical bridge width W from the outermost circumference of the perforation part to the second row, for example, is
It is increased with respect to the vertical bridge width Wl in the horizontal axis X direction of the mask which is in contact with 1M, and the minimum opening width of the pore (9) in the horizontal axis X direction is set to be almost the same as D1 in Di. Specific dimensions for the 14-inch shadow mask are shown in Table 2.

(Margins below) Table 2 In this shadow mask (5), although the minimum opening width of the pores (9) was slightly enlarged by the press extension of the minimum opening width D1 at the periphery during normal press forming, the vertical bridge (
No cracks were observed in the (to) part, and the accuracy was sufficient for practical use. Moreover, even when this shadow mask (5) is installed in the glass bulb (1), sufficient spherical strength can be obtained compared to the conventional one.

FIG. 7 shows another embodiment.

In this embodiment, the perforations are arranged in a corner part 0 (including the diagonal axis) (Fig. 2) connecting the long side and the short side of the perforated surface of the shadow mask (6), and the perforations are arranged in the vertical direction from the outermost periphery of the perforated part. The vertical bridge width W1 up to the column is increased relative to the vertical bridge width W1 of the adjacent mask in the horizontal axis X direction, and the minimum opening width and total opening width of the pore (9) are increased. It has been reduced. The specific dimensions of the 14-inch window mask are shown in Table 6. Table 6 In the shadow mask (5) of the above example, there is no cracking of the vertical bridge α0) in normal press molding, and there are no cracks in the pores (9
) was also suppressed to the same extent as that of the periphery. Even when this was installed in the glass bulb (1), there was little color shift at the periphery of the screen, and sufficient spherical strength was obtained.

By the way, the predetermined rows in the vertical direction from the outermost circumferential position of the perforation part of the corner part 0 of the shadow mask are not limited to those of the above embodiment, and the predetermined rows are only the width of the minimum opening of the pores (9). Needless to say, sufficient effects can be expected from the operation.

According to the experimental results, at least one of the minimum opening width p of the pores (9) in the four shadow masks (5) and the vertical bridge width W between the pores (9) and (9) is adjacent to each other. The desired purpose can be achieved by reducing the minimum opening end D in the mask horizontal axis X direction and the minimum opening width by 5 μ or more from the vertical bridge width W, or by increasing the vertical bridge width W' by 10 μ or more. found.

As described above, the present invention provides a shadow mask by setting at least one of the horizontal minimum opening width of the rectangular pores of the shadow mask and the vertical bridge width between the pores to a specific condition. Defects during press molding of the mask are suppressed, material yield is improved, mechanical strength is improved, and an excellent color cathode ray tube with less color shift can be provided.

[Brief explanation of drawings]

Figure 1 is a partially cutaway side view showing the configuration of a conventional color cathode ray tube, Figure 2 is a simplified configuration diagram of a conventional shadow mask, Figure 6 is a partially enlarged view of a conventional shadow mask, and Figure 4 is a partially cutaway side view showing the configuration of a conventional color cathode ray tube. Figure 6 is a cross-sectional view taken along line A--person line, Figure 5 is a cross-sectional view taken along line B-B in Figure 6,
FIG. 6 is a partial front view of a color cathode ray tube shadow mask according to one embodiment of the present invention, and FIG. 7 is a partial front view of a shadow mask according to another embodiment of the present invention. (2)... Fluorescent surface, (3)... Electron gun, (5)...
・Shadow mask, (9)...pore, (9&)...
Fluorescent surface side opening, (9b)... Electron gun side opening, D.
...Minimum opening width, W... Vertical bridge width - X T-w horizontal axis, O... Part of mask corner. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Makoto Kuzuno (1 other person) (9) Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] (1) A color cathode ray in which the shadow mask has a large number of electron beam passing pores formed in a rectangular shape, and the opening of each of the pores on the fluorescent surface side is enlarged from the opening on the electron gun side. In the pipe, the minimum opening width of the mask in the horizontal direction of the pores is gradually decreased from the outermost circumferential position of the perforation part to a predetermined column in the vertical direction in the perforation arrangement of the Shadrama;
A color cathode ray tube characterized in that the width of the longitudinal bridge between the pores is gradually increased (either one of the conditions is selected and set).