JP3468090B2 - Musiri method of shadow mask - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the production of a shadow mask used for a color picture tube or the like, and more particularly, to a blank portion formed on the outer periphery of a portion to be a shadow mask. The device is related to the device when removing. 2. Description of the Related Art A photo-etching method is known as a method for manufacturing a shadow mask used for a color picture tube or the like. After a photoresist layer is formed on a thin plate-shaped metal material serving as a substrate of a shadow mask, a shadow mask is obtained by a series of known means such as pattern exposure, development, etching, and stripping of the photoresist layer. As a method of manufacturing the shadow mask, the etching is divided into two stages, and after performing the first stage etching, an etching preventing layer such as a varnish is formed on one surface of the metal material, and then the second stage etching is performed. Perform eye etching on the other side, and then
There is also a method of removing the etching prevention layer and the resist film. FIG. 6 shows an example of the state of the shadow mask 11 formed on the thin metal plate 9 manufactured by the photo-etching method and completed up to the step of removing the resist film. In the case where the metal material has a long strip shape, the metal material is cut off after the film stripping step, and the sheet metal sheet 9 shown in FIG. 6 is obtained. In the manufacture of a shadow mask, an unnecessary margin 4 on the outer periphery of the skirt 3 is removed from the sheet metal sheet 9 on which the shadow mask 11 is formed as shown in FIG. Specifically, the shadow mask 1 shown in the example of FIG. 5 is used. Here, an image portion 2 in FIGS. 5 and 6 shows a screen portion of a shadow mask in which a large number of through-hole patterns are formed. Further, a skirt portion 3 on the outer periphery of the image portion 2
Denotes an external part, which is formed into a predetermined shape by a press or the like when incorporated in a color picture tube. Here, as a method for removing the unnecessary blank portion 4 from the metal sheet 9 shown in FIG.
That is, a method is used in which a mold having the outer shape of the skirt portion 3 is formed, and the blank portion 4 is mechanically punched and removed from the thin metal plate 9 using the mold. As shown by the dotted line in FIG. Shadow mask formed on metal sheet 9
The boundary line (dotted line in FIG. 6) between the skirt portion 3 and the margin portion 11 is a cutting line 5 composed of a penetrating line and an easily breakable line (half-etched line). Is a way to take a squirrel. However, the mechanical method using a mold has a problem in that an excessive force is applied to the shadow mask at the time of punching, and the shadow mask is distorted, resulting in a defective shape. For this reason, a method of forming the cutting line 5 on the metal sheet 9 in advance, removing the cutting line 5 part by hand, and removing the blank part 4 is mainly used. In this case, it is necessary to remove the margin 4 with the thin metal plate 9 on which the shadow mask is formed fixed in a flat shape. In fixing the thin metal plate 9, the following method is used. It was common to do. First, as shown in the example of FIG. 4, the thin metal plate 9 on which the shadow mask 11 is formed is placed on a flat table (mounting table 6) made of stainless steel or the like. Next, a flat holding plate 7 covering the inside of the skirt portion 3, which is slightly smaller than the outer shape of the skirt portion 3, is put on the thin metal plate 9. At the time of removing the margin 4, pressure is applied to the holding plate 7 in the direction of the mounting table 6 to fix the thin metal plate 9 sandwiched between the mounting table 6 and the pressing plate 7. It should be noted that the mounting table 6 and the holding plate 7
The size of the mounting table 6 (the surface in contact with the thin metal plate 9) is often about the same as the size of the holding plate 7 so that the margin 4 protrudes when sandwiched between. Also, as shown in FIG.
In order to increase the efficiency of stripping and increase the number of shadow masks to be produced, a plurality of metal sheets 9 are aligned and the mounting table 6 is aligned.
After being piled up, the fixing is carried out by the holding plate 7, and the removal of the plurality of blank portions 4 is collectively performed. As shown in FIG. 3, the margin 4 is removed manually or mechanically to obtain the shadow mask 1 shown in FIG. 5, and then the holding plate 7 is removed, and the shadow mask 1 is inspected. To the next process. However, the above-mentioned Musiri method has the following problems. That is, there is a problem that foreign matter easily adheres to the shadow mask. In the atmosphere around the waste removal process, fiber fragments, dust, resist fragments generated in the shadow mask manufacturing process, and the like floating from the clothes of the worker float as foreign matters. These foreign substances floating around are settled and adhere to the surface of the mounting table 6 or the holding plate 7. When removing the waste, the metal sheet is pressed by the mounting table 6 and the holding plate 7 to which the foreign matter is attached. When the holding member 9 is sandwiched and fixed, foreign matter on the surface of the mounting table 6 and the holding plate 7 is transferred to the shadow mask. Normally, after the margin is removed and the state shown in FIG. 5 is obtained, the shadow mask 1 is inspected. In the inspection of the shadow mask 1, a visual inspection using a magnifying glass or the like, or light irradiation to a through-hole forming portion (image portion 2) is performed, and light that has passed or reflected through the through-hole is video camera or the like. Inspection by an automatic inspection machine which performs image processing on a computer by capturing the light image as a light image by a computer may be mentioned. In any case, the through hole formed in the image portion 2 of the shadow mask 1 has a desired shape. In many cases, whether or not inspection is one of the inspection items. In the above-described method, the portion (image portion 2) in which the through-hole is formed comes into contact with the holding plate 7 and the mounting table 6, and when foreign matter adheres to the image portion 2, the inspection is performed. The foreign matter becomes a shadow, and the shadow mask is recognized as a defective through hole. Prior to the inspection, foreign matter removal on the shadow mask surface is performed with a brush or adhesive roller, etc., but as described above, it is transferred to the shadow mask while applying pressure, and the attached foreign matter sticks firmly to the shadow mask, usually It cannot be easily removed by the foreign matter removal work method. When a plurality of metal sheets 9 are stacked, the metal sheet 9 to which foreign matter adheres (shadow mask 11)
Is the uppermost layer directly in contact with the surface of the mounting table 6 and the holding plate 7,
Not only the lowermost layer but also the uppermost and lowermost metal sheet 9
Foreign matter intrudes through the through-hole, and foreign matter adheres to several upper and lower sheets of the laminated metal sheet. Conventionally, when a failure occurs in the above inspection, the failure is a true defect (for example, a defective hole diameter or a defective shape) caused by a manufacturing defect, or the through hole is formed normally. However, it is often the case that a re-inspection is performed to determine whether or not the error is a pseudo error determined to be defective due to foreign matter adhesion. In the re-inspection, it is difficult to determine whether or not the defect is due to the adhesion of a foreign substance with an automatic inspection machine, so that a visual inspection is performed. For this reason, when defects due to foreign matter adhesion frequently occur,
Even if the inspection efficiency is increased by the introduction of an automatic inspection machine, the re-inspection is performed visually, which increases the labor of the inspection and lowers the inspection efficiency. SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems.
It is an object of the present invention to provide a shadow mask cleaning method in which foreign matter does not adhere to a shadow mask even when a metal sheet on which a shadow mask is formed is fixed in order to remove a blank portion by using a mask. That is, the present invention provides an image section having a plurality of through holes formed according to a predetermined pattern, a skirt section formed around the image section, and a margin around the outer periphery of the skirt section. Part, and a sheet metal sheet having a cutting line formed at the boundary between the skirt part and the margin part is fixed between the mounting table and the holding plate, and then the margin part is removed at the cutting line part and the shadow mask is removed. In the shadow mask method, the mounting table and the holding plate are formed into a square frame having an opening, and when the thin metal plate is fixed, the skirt portion and the frame portion are brought into contact with each other. The above-mentioned problem has been solved by providing a shadow mask method for shadow masks. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, description will be made with reference to the drawings showing an embodiment of the present invention. The sheet metal sheet 9 on which the shadow mask used in the present embodiment is formed is obtained by a conventionally known method as described in the above section (prior art).
As in the prior art, as shown in the example of FIG. 6, an image portion 2 having a plurality of through holes formed according to a predetermined pattern, a skirt portion 3 formed around the image portion, a margin 4 around the skirt portion, and , A cutting line 5 at the boundary between the skirt portion 3 and the margin portion 4. The cutting line 5 is composed of a penetrating line and an easily breakable line (half-etched line) as in the prior art. Next, the margin 4 is removed in the same manner as in the production of the conventional shadow mask. A feature of the present invention is that the margin 4 is removed by the following method. . First, as shown in FIG. 1, the metal thin plate 9 (shadow mask 11) is placed on a frame-shaped placing table 6 having a rectangular opening 18 made of stainless steel or the like. . Next, as shown in FIG. 1, a metal thin plate 9 is formed by a frame-shaped holding plate 7 having a square-shaped opening 8.
(Shadow mask 11). At this time, the opening 8 of the holding plate 7 and the opening 18 of the mounting table 6 have a size such that the image portion 2 of the shadow mask 11 is exposed, and each frame portion has a size that comes into contact with the skirt portion 3. It is. That is, the mounting table 6 and the holding plate 7 are
When the skirt portion 3 of the (shadow mask 11) is sandwiched, the image portion 2 is exposed from each of the openings (8 and 18), and the margin portion 4 including the cutting line 5 is removed from the mounting table 6 and the holding plate 7. It has a protruding shape. For convenience of explanation, FIG.
Is described only as a frame portion, but in this embodiment, the structure shown in FIG. FIG. 2 is a diagram showing a cross-sectional structure of the holding plate 7. That is, a surface in contact with the metal thin plate 9 is a stainless steel frame-shaped thin plate, a vinyl chloride plate is attached to the other surface side, and furthermore, in order to facilitate handling such as raising and lowering the holding plate 7 and carrying,
The handle was provided on a plate made of vinyl chloride. Next, pressure is applied to the holding plate 7 in the direction of the mounting table 6, so that the margin 4 of the shadow mask 11, which is held and fixed between the mounting table 6 and the holding plate 7, as shown in FIG. In the same manner as in the above, the waste was manually removed or removed by a mechanical waste means sandwiched between clamps or the like. As described above, by forming the holding plate 7 and the mounting table 6 as square frames having openings, foreign matters in the atmosphere around the pressing process can be used.
However, even if it adheres to the frame, the foreign matter only adheres to each frame portion, and even if pressure is applied to the holding plate 7, the foreign material transfers and adheres to the skirt portion 3. As described above, the skirt portion 3 is a portion to be formed by pressing later, and can be said to be a portion having no practical problem even if foreign matter adheres or is damaged by contact with the holding plate 7 and the mounting table 6. In addition, even if a foreign matter adheres to the image portion 2 exposed from each of the openings 8 and 18, it does not mean that it is stuck due to the pressure.
Before inspection, foreign matter in the image area 2 can be easily removed by rubbing with a brush or an adhesive roller. Although an example of the embodiment of the present invention has been described above, the embodiment of the present invention is not limited to the above description and drawings, and various modifications may be made based on the gist of the present invention. It goes without saying that it does not matter. For example, in FIG. 1 described above, one shadow mask is removed, but as shown in FIG. 3, a plurality of shadow masks are overlapped, and a plurality of blank portions 4 are collected together. You can take Musiri. In addition, the material of the holding plate and the mounting table may be appropriately selected from other materials. As described above, according to the shadow mask method of the present invention, the foreign matter does not stick to the image area where the through hole is formed, and the foreign matter removing means such as a brush or an adhesive roller after removing the margin. Can easily remove foreign matter.
For this reason, even if the shadow mask is inspected after the margin is removed, the pseudo error due to the adhesion of the foreign matter is eliminated, and the inspection accuracy is improved. Also, as described in the section (Prior Art), when a pseudo error occurs, a visual re-inspection is performed, so that the inspection labor is increased and the inspection efficiency is reduced. The invention solves the problem and can improve the inspection efficiency. [0030]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view showing one embodiment of a shadow mask method of the present invention. FIG. 2 is an explanatory sectional view showing an example of a holding plate used in the shadow mask method of the present invention. FIG. 3 is a partially enlarged explanatory view showing a main part of an example of a conventional shadow mask cleaning method. FIG. 4 is an explanatory view showing an example of a conventional shadow mask method. FIG. 5 is an explanatory diagram showing an example of a shadow mask after a margin is removed. FIG. 6 is an explanatory diagram showing an example of a sheet-shaped shadow mask having a margin. [Description of Signs] 1, 11 Shadow mask 2 Image section 3 Skirt section 4 Margin section 5 Cutting line 6 Mounting table 7 Holding plate 8, 18 Opening 9 Metal sheet

Claims (1)

(57) [Claim 1] An image portion having a plurality of through holes formed according to a predetermined pattern, a skirt portion formed around the image portion, a margin portion around the skirt portion, and A sheet metal sheet with a cutting line formed at the boundary between the skirt and the margin,
After being clamped and fixed between the mounting table and the holding plate, in the shadow mask method of removing the margin at the cutting line portion and using the shadow mask, the mounting table and the holding plate are cut into a square shape having an opening. And a skirt portion and said frame portion are brought into contact with each other when the thin metal plate is fixed.