JP3208662B2 - Method of forming flat aperture grill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a flat aperture grill (hereinafter abbreviated as FAG) in a color cathode ray tube (hereinafter abbreviated as CRT) provided with a slit provided in a color selection mechanism. About.

[0002]

2. Description of the Related Art Usually, a phosphor is applied to a CRT panel from the inner surface side. When this phosphor is irradiated with an electron beam, it emits light and emits color. Then, the color selection mechanism is exposed as a negative material, and the phosphors of three colors of red, blue and green are separately applied to the inner surface side of the panel.

[0003] First, a color selection mechanism is fitted on the inner surface side of the panel, and the slit shape is exposed to polyvinyl alcohol (hereinafter abbreviated as PVA) or polyvinylpyrrolidone (hereinafter abbreviated as PVP) applied to the inner surface side of the panel. Then, a PVA or PVP film having the slit shape exposed is formed. Then, the color selection mechanism is removed from the panel. Next, the exposed PVA or PVP film is developed to remove unexposed portions of PVA or PVP. Further residual PVA
Alternatively, carbon is applied from above the PVP film. And P
By decomposing and removing the VA or PVP film, the PVA
Or the carbon applied on the PVP film is also removed,
A stripe shape in which the slit shape of carbon is inverted is formed. From this stripe shape, red, blue,
Of the three green colors, for example, to expose green phosphor, PV
Apply A or PVP. Then, the color selection mechanism is fitted into the inner surface of the panel again, the PVA or PVP is exposed and developed, the PVA or PVP is removed, and a green phosphor is applied to the removed portion. Thus, the green phosphor is applied to the gap between the stripes. Similar to the green phosphors described above, the blue and red phosphors are also sequentially exposed and applied to the panel. As described above, the phosphors of the three colors are separately applied only to the range in which the color is to be developed.

Here, a method of forming the above-described color selection mechanism will be described. First, the FAG 1 shown in FIG. 1 is formed. This FAG1
Is provided with a slit 2 having a shape conforming to the standard of each CRT. Here, the slit 2 is formed in a strip shape, but is not limited to the strip shape, and may be a slot shape or the like.

As shown in FIG. 2, after the FAG 1 is welded to the frame 3, an unnecessary portion called a peripheral of the FAG 1 is removed to form a color selection mechanism.

[0006]

However, in the method of forming the color selection mechanism, as shown in FIG. 2, the slit 2 is deformed due to heat and pressure applied when the FAG 1 is welded to the frame 3. . At this time, it is deformed and CR
The deviation from the T standard is defined as the deformation amount 4.

FIG. 2 shows the state of the deformation amount 4. That is, the slit 2 after welding is represented by a solid line, and the slit 2 when drilled in advance is represented by a dotted line. The slit 2 is not only widened but also narrowed, and is deformed in an arbitrary direction.

When the phosphors of the three colors red, blue and green are applied to the panel using the deformed color selection mechanism as described above, the phosphors are displaced by the amount of deformation 4 and the phosphors are displaced. Applied to For this reason, the width of the phosphor applied to the CRT panel is disturbed, and color unevenness occurs. This color unevenness is C
This has a negative effect on the commercial value of RT.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems.

That is, formation of a flat aperture grill
The method uses a flat-aperture welded to a color selection mechanism.
A method of forming a aperture grill, in which a slit is formed in advance.
Installed flat aperture grille on the frame
Welded, and the preceding flat welded to the frame
By measuring the shape of the slit in the aperture grill
The amount of deformation of the slit is determined, and the subsequent flat aperture
A slit should be drilled in the grill to allow for the deformation.
It was characterized. In addition, the amount of deformation depends on the standard of the cathode ray tube.
A slit along the leading flat aperture
Forming a flat grille, the preceding flat aperture grille
A color selection mechanism obtained by welding
By performing light, a stripe shape is formed on the inner surface of the panel.
Forming a phosphor, said stratification to the standard of said cathode ray tube;
It can be obtained by measuring the deformation amount of the ip shape.
Wear.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. Note that, in the embodiment of the present invention, the same components as those of the related art are denoted by the same reference numerals. As shown in FIG. 2, the panel is exposed and developed by using the deformed color selection mechanism, and the phosphor is applied.

At this time, the panel is exposed as it is, including the deformation amount 4. For this reason, the stripe shape of the phosphor applied to the panel is measured, and the amount of deformation 4 generated from the CRT standard is measured.

After measuring the deformation amount 4, the next color selection mechanism is formed.

FIG. 3 shows a method of forming the corrected FAG1. Slit 2 with a shape that allows for the measured deformation 4
Is drilled in FAG1. That is, the slit 2 is formed in the plate material by subtracting the deformation amount 4.

FIG. 3 shows a state in which the deformation amount 4 is subtracted. In other words, the slit 2 after drilling is represented by a solid line,
The shape conforming to the CRT standard is represented by a dotted line.

Here, the slit 2 is assumed to be expanded and deformed. However, the slit 2 may be narrowed and deformed. In this case, assuming that the deformation amount 4 occurs in the negative direction, the slit 2 is formed by subtracting the deformation amount 4 in the negative direction from the shape conforming to the CRT standard.

An embodiment will be further described with reference to the drawings. CR
Since there are various FAGs 1 depending on T, it is assumed here that the FAG 1 is formed from the metal plate 11 as shown in FIG.

In the metal plate 11, for example, 713 slits 12 are formed bilaterally symmetrically according to the CRT standard. Therefore, the 357th line counted from the right or left corresponds to the center. Although the shape is slightly different for each slit 12, the details are omitted.

Here, in particular, the 357th slit 12 will be described with reference to FIG. In this slit 12, the center in the vertical direction is set as a reference, that is, Y = 0 mm.
At this time, the width of the slit 12 is Y = 0 m as shown in the figure.
It is 0.231 mm at the measurement point of m, and Y = 140 mm
The measurement point is 0.226 mm.

Assuming that the 357-th slit 12 is deformed and expanded in the lateral direction by a minute amount, for example, about 0.02 mm,
When Y = 0 mm, it becomes 0.251 mm, and Y = 140 mm
Is 0.246 mm. Thus, for example, 0.0
Even a small deformation of 2 mm causes a noticeable color unevenness on the screen of the CRT.

Therefore, the screen of the CRT is significantly deteriorated. Therefore, the 357th slit 12 is Y-shaped to correct the deformation.
= 0mm, drilled with a width of 0.211mm, Y = 14
In the case of 0 mm, the hole is drilled with a width of 0.206 mm. Then, the shape of the slit of the color selection mechanism is corrected by welding the metal plate 11 having the slit 12 whose deformation has been corrected to the frame.

[0022]

According to the present invention, it is possible to form a FAG in which a slit is formed in which a deformation of a slit generated when processing a FAG is corrected. In other words, the panel is exposed and developed by the color selection mechanism formed using the first FAG,
The amount of deformation of the applied phosphor is measured, and a slit is formed in the second FAG by subtracting the amount of deformation.
For this reason, if the FAG is formed at least twice, the slit in which the deformation of the slit caused by the processing is corrected can be used as the FA.
Can be drilled in G.

Therefore, it is possible to prevent color unevenness occurring on the screen of the CRT, which has a positive effect on the commercial value of the CRT.

[Brief description of the drawings]

FIG. 1 is a view showing a FAG in which a slit is formed in advance.

FIG. 2 is a diagram showing a FAG welded to a frame.

FIG. 3 is a diagram illustrating a FAG after slit shape correction.

FIG. 4 is a diagram illustrating a FAG according to the embodiment.

FIG. 5 is a table showing slit shapes according to the embodiment.

[Explanation of symbols]

1. Flat aperture grille (FAG), 2. Slit, 3. Frame, 4. Deformation amount

Claims (2)

(57) [Claims] 1. A method for forming a flat aperture grill used by welding to a color selection mechanism, comprising: welding a preceding flat aperture grill having a slit formed in advance to a frame; The preceding flat aperture welded
Measure the shape of the slit in the grill and
Determine the amount of deformation of the preparative method of forming a flat aperture grille is characterized by drilling a slit in anticipation of the amount of deformation in the rear row of the flat aperture grille. 2. The deformation amount is: Drilling slits in accordance with the cathode ray tube standard
Forming a flat aperture grill, Color selection obtained by welding the preceding flat aperture grill
By installing another mechanism on the inner surface of the panel and performing exposure,
A stripe-shaped phosphor is formed on the inner surface of the panel, Deformation amount of the stripe shape with respect to the standard of the cathode ray tube
3. The method according to claim 1, wherein the measurement is performed by measuring
A method for forming the flat aperture grill according to the above.