JPH1173876A - Manufacture of shadow mask - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a shadow mask capable of easily removing margin sections and not causing a problem such as a defective shape on an image section. SOLUTION: This manufacturing method of a shadow mask has the process for forming the branch/leaf-shaped shadow mask containing an image section 2, a skirt section 3 formed around the image section 2, margin sections 4 on the outer periphery of the skirt section 3, and a cutting line 5 on the boundary between the skirt section 3 and the margin sections 4a-4d and the process for removing the margin sections 4a-4d from the shadow mask. This manufacturing device is provided with a means pinching the skirt section 3 and fixing the shadow mask, a means pinching the margin sections 4a-4d, and a means pulling the means pinching the margin sections 4a-4d in the direction nearly perpendicular to the cutting line 5 and horizontal to the shadow mask face. When the margin sections 4a-4d are to be removed, the shadow mask is pinched and fixed, and the opposite margin sections 4a-4d are concurrently pulled, then the margin sections 4a-4d are removed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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 device for removing a margin formed on the outer periphery of a shadow mask.

[0002]

2. Description of the Related Art A photo-etching method is known as a method of 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. In addition, as a manufacturing method of the shadow mask, in addition to the photoresist layer,
There is also a method of forming an etching prevention layer such as a varnish on a metal material.

FIG. 3 shows a state of the shadow mask 11 manufactured by the photo-etching method and completed up to the step of removing the resist film. When the metal material has a long strip shape, the metal material is cut after the film removing step to form a single-wafer shadow mask 11 shown in FIG.

In manufacturing a shadow mask, unnecessary blank portions 4 are removed from the single-piece shadow mask 11 shown in FIG. 3, and the shadow mask 1 shown in FIG. .

Here, the image portion 2 in FIGS. 2 and 3 shows a screen portion of a shadow mask in which a large number of hole patterns are formed. The skirt portion 3 indicates an outer shape portion, and is a portion formed by pressing or the like when incorporated in a color picture tube.

Here, as a method for removing unnecessary margins 4 from the shadow mask 11 in FIG. That is, a method is used in which a mold having the outer shape of the skirt portion 3 is created and the blank portion 4 is mechanically punched out of the shadow mask 11 using the mold. Also, as shown by a dotted line in FIG. In this method, the boundary line between the skirt portion 3 and the margin portion 11 is formed as a cutting line 5 composed of a penetrating line and an easily breakable line (half-etched line), and the margin portion 4 is manually removed.

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. Further, the method of forming the cutting line 5 on the shadow mask 11 in advance and manually removing the margin 4 by hand is inefficient because the work efficiency is low due to the manual operation, the number of shadow masks produced is reduced, and the shadow is removed when the mask is removed. There is a problem that defects such as wrinkles easily occur in the mask. In addition, the manual method has a problem in terms of work safety because the sharp edge of the metal plate tends to injure the operator.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object the following:
It is an object of the present invention to provide a method of manufacturing a shadow mask that can easily remove a blank portion and does not have the above-described problems such as a defective shape.

[0009]

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 on the outer periphery of the skirt section. A method of manufacturing a shadow mask, comprising: a step of forming a sheet-shaped shadow mask having a boundary between a skirt portion and a margin portion as a cutting line; and a step of removing the margin portion from the shadow mask. Means for holding the portion, fixing the shadow mask, means for holding the margin, and means for pulling the means for holding the margin in a direction substantially perpendicular to the cutting line and in the horizontal direction with respect to the shadow mask surface, When removing the margins, the margins are removed by simultaneously pulling the opposing margins while holding and fixing the shadow mask. To provide a process for the production of Doumasuku is obtained by solving the above problems.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention.

In the method of manufacturing a shadow mask according to the present invention, as described in the above section (prior art), a sheet-shaped shadow mask having a margin 4 shown in FIG. 11 is what you get.

That is, an image portion 2 which is a screen portion of a shadow mask in which a large number of hole patterns are formed in accordance with a predetermined pattern, a skirt portion 3 which is a portion formed by pressing or the like when incorporated into a color picture tube. A shadow mask 11 having a margin 4 on the outer periphery of the skirt 3 is formed in a conventional manner.

The boundary between the skirt 3 and the margin 4 is
A cutting line 5 similar to that formed when the margin portion 4 is manually removed, that is, a cutting line 5 composed of a penetrating line and an easily breakable line (half-etched line) is formed. .

Next, the blank portion 4 is removed in the same manner as in the conventional method of manufacturing a shadow mask. A feature of the present invention is that the blank portion 4 is removed by the following method.

That is, first, as shown in FIG. 1A, a shadow mask 11 having a margin 4 is placed on a mounting table 6 having, for example, a rectangular shape having an opening 8. At this time,
The image section 2 of the shadow mask 11 is located at the opening 8 of the mounting table 6, and the skirt section 3 is mounted on the frame of the mounting table 6.

Next, as shown in FIG.
The shadow mask 11 is clamped and fixed by, for example, a square-shaped pressing plate 7 having 18. Also at this time, the shadow mask 11
Is positioned at the opening 18 of the holding plate 7, and
The frame of the holding plate 7 is brought into contact with the skirt 3. That is, the shadow mask 11 is held between the skirt portions 3.

Next, as shown in FIG. 1 (b), the margin 4 of the shadow mask 11, which is held and fixed by the mounting table 6 and the holding plate 7, is held by holding means 9 such as a clamp. In the shadow mask shown in FIG.
Therefore, the margins 4 on each side are sandwiched by four clamping means 9. The force with which the margins 4 are sandwiched by the clamping means 9 is appropriately set according to the material, thickness, number of sheets, etc. of the shadow mask so that the margins 4 do not come off from the clamping means 9 during pulling described later. FIG. 1 (b)
In the figure, the mounting table 6 for holding and fixing the shadow mask 11 and the pressing plate 7 are omitted for convenience of explanation.

The holding means 9 comprising a clamp or the like is connected to a pulling means 10 driven by a hydraulic or electric motor or the like (not shown). The pulling means 10 holds the holding means 9 such as a clamp in a direction substantially perpendicular to the cutting lines 5 formed on the held and fixed shadow mask 11 and in a horizontal direction with respect to the surface of the shadow mask 11 by, for example, about 100 to 300 kgf / cm ^2. It is pulled by the power of.

By pulling each margin 4 sandwiched by the holding means 9 by the pulling means 10, the margins 4 are separated at the cutting line 5 and the shadow mask 1 shown in FIG.
Is what you get.

Here, it can be said that it is desirable to separate the margins 4 at the same time between the opposing margins 4.
For example, in the shadow mask shown in FIG. 1, since there are margins on four sides and the space is divided into four, the margins 4a and 4c are simultaneously cut off, and then the margins 4b and 4d are simultaneously formed. Disconnect. Alternatively, the margins 4 on the four sides are simultaneously cut off. By simultaneously separating the opposing margins, the stress at the time of tension is offset, unnecessary external pressure is not applied to the shadow mask 11, and the shadow mask 11
Can be prevented from being deformed.

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 the above-described drawing, one shadow mask is printed. However, after a plurality of shadow masks are overlapped, a plurality of margins are collectively sandwiched by the holding means, and the above-described printing is performed. You can go. At this time, it is possible to perform the shadow masking in a state where the directions of the shadow masks are roughly aligned on the mounting table 6 (for example, a state in which the sides of the shadow masks protrude slightly when they are stacked). It is not necessary to stack the shadow mask on the mounting table 6 with the shadow mask completely aligned, such as aligning the sides in a straight line.

[0023]

According to the method for manufacturing a shadow mask of the present invention, since the margin is mechanically removed, the production efficiency is improved as compared with manual work, and the safety is ensured without injuries to workers. Will be improved. Further, since the shadow mask is pinched and fixed at a portion which does not affect the display quality of the shadow mask, it is possible to prevent the shadow mask from being deformed poorly at the time of cutting. Furthermore, since it is possible to make a shadow even when the directions of a plurality of shadow masks are roughly aligned, there is no need to stack the shadow masks on a mounting table with the shadow masks completely aligned, thereby eliminating the trouble of completely aligning the shadow masks. It can be said that production efficiency can be further improved.

[0024]

[Brief description of the drawings]

FIGS. 1 (a) and 1 (b) are explanatory views showing, in the order of steps, essential parts of an embodiment of a method of manufacturing a shadow mask according to the present invention.

FIG. 2 is an explanatory diagram illustrating an example of a final state of a shadow mask from which a blank portion has been removed.

FIG. 3 is an explanatory view showing an example of a sheet-shaped shadow mask.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 11 Shadow mask 2 Image part 3 Skirt part 4 Margin part 5 Cutting line 6 Mounting table 7 Holding plate 8, 18 Opening 9 Nipping means 10 Pulling means

Claims (1)

[Claims] An image portion having a plurality of through holes formed in accordance with a predetermined pattern, a skirt portion formed around the image portion, and a margin around the skirt portion. In a method of manufacturing a shadow mask having at least a step of forming a sheet-shaped shadow mask having a boundary as a cutting line and a step of removing the margin from the shadow mask, a skirt portion is sandwiched and the shadow mask is fixed. Means, means for clamping the margin, and means for pulling the means for clamping the margin in a direction substantially perpendicular to the cutting line and in the horizontal direction with respect to the shadow mask surface, and when removing the margin, the shadow mask is removed. A method of manufacturing a shadow mask, characterized in that margins are removed by simultaneously pulling opposing margins in a state of being clamped and fixed.