JPS6235217B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a shield net for a display device such as a frequency display tube.

In frequency display tubes, radio waves are emitted from the front of the display due to electrical discharge, but these radio waves can cause noise in nearby radio receivers, or may enter the tuner and adversely affect tuning characteristics. . For this reason, it is necessary to shield the radio waves by arranging a shield net in front of the display section with an aperture ratio that does not interfere with the numerical display on the display tube.

As a shield net that has been used conventionally, there is one shown in FIG. 1, for example. This shield net 1 is provided with a net-like portion 2 having a large number of openings that do not block the numbers on the display section, and this net-like portion is formed by etching an aluminum plate. However, when making a shield net by etching in this way, it is necessary to
If we do not produce lots of 10,000 or more pieces, the cost will increase, but in reality we can only produce about 1,000 to 3,000 pieces per month, making it extremely difficult to mass-produce. Furthermore, because nets made by etching can only be made from thin plates due to cost considerations, they are difficult to handle and deform when screwed together, which is undesirable.

As another example, as shown in FIG. 2, a shield net 11 having a notch or a round hole into which a mounting screw 13 is inserted is also known. This is achieved by cutting a stainless steel net into a predetermined shape, but due to the requirement that the wire diameter of the mesh portion 12 is small and the mesh is rough, the shape may be distorted when cut, resulting in the desired shape. The display tube may be significantly deformed, resulting in poor shape and dimensional accuracy, and in some cases, it may become impossible to attach it to the front surface of the display tube. For this reason, defective products are likely to occur, resulting in poor yield, which is also a major reason why productivity cannot be improved. Also, the net may be deformed when screwed. However, since this net is made by cutting the stainless steel net itself, the edges of the net will inevitably become rougher, and some of the stainless steel wire will become loose and fall off from the cut end of the net. may adhere to the display tube substrate and cause shoots.

The present invention has been made in order to correct the above-mentioned defects, and is a method for manufacturing a shield net placed in front of a display part of a display device (for example, a frequency display tube), in which a release paper is provided on one surface. The other side of the double-sided adhesive tape with the adhesive attached is pasted on one side of the frame material, and the frame material is punched together with this double-sided adhesive tape with release paper, thereby forming a one-to-one bond on the display part. forming a plurality of openings corresponding to the double-sided adhesive tape in the frame material; peeling off the release paper from the double-sided adhesive tape; and applying a shielding net on one side of the frame material including the openings to the double-sided adhesive tape. and cutting the frame material together with the shield net between the plurality of openings, thereby forming the shield net into individual shield nets held on the respective frames. The present invention relates to a method for manufacturing a shield net for a display device, which comprises a step of dividing the shield net into two parts. By this method, it is possible to always obtain a shield net of a predetermined shape, the stability and reliability of attachment to the display device can be improved, and the shield net is also excellent in mass productivity. In addition, there is almost no occurrence of defective products, and productivity can be significantly improved.

Next, an embodiment in which the present invention is applied to a frequency display tube will be described with reference to FIGS. 3 to 13.

First, as shown in Figures 3 and 4, an aluminum plate (t0.3) is a frame material that can form a plurality of openings that correspond one-to-one to the display part of the display device.
20 (hereinafter simply referred to as an aluminum plate), a double-sided adhesive tape 23 with release paper attached to one side.
Paste the other side of the The aluminum plate 20 has a width corresponding to the length of a shield net, which will be described later, and is cut at predetermined intervals in the width direction to form frames or holding plates for individual shield nets.

Next, as shown in FIGS. 5 and 6, the aluminum plate 20 is punched out together with the adhesive tape 23 using a press, and rectangular openings 24 corresponding to display sections to be described later are formed at predetermined intervals in the length direction of the aluminum plate 20. .
A double-sided adhesive tape 23 has already been pasted on the surface of the aluminum plate 20.
Since a release paper is attached to the surface (that is, the surface opposite to the surface bonded to the aluminum plate 20), the above-described pressing process can be performed. Therefore, since the double-sided adhesive tape 23 can be processed at the same time as the aluminum plate 20 that is the frame material, there is no need to worry about the processing process of the double-sided adhesive tape 23 or the troublesome application of the double-sided adhesive tape to the frame material after processing. Not only can the process be omitted, but also excellent processing can be performed in which each shape and attachment position are completely matched.

Next, as shown in FIGS. 7 and 8, a stainless steel net 22 of diameter 0.04 mm and mesh #75, which was fabricated in advance and woven in a grid pattern vertically and horizontally, is attached to an aluminum plate 2.
Paste against 0. At this time, the release paper (not shown) of the tape 23 is peeled off, and the net 22 is adhered via this tape 23.

Next, as shown in FIG. 7, the aluminum plate 20 is punched out with a press along with the net 22 at imaginary line positions between the openings 24, thereby cutting into individual shield nets 31 as shown in FIGS. 9 and 10. do. At the same time, the circular hole 25 for attaching the shield net
Also punch out.

As described above, the net 22 and the aluminum plate 2
By punching out 0 and processing it into the specified external shape,
It will be understood that a shield net 31 of a predetermined shape is always obtained. That is, the net 22 is
When used alone, the net is made of a thin wire with a coarse wire diameter that does not have a uniform shape, but the aluminum plate 20
Since it is adhesively held on the top with double-sided adhesive tape 23, its shape remains constant even when punching out.
This is because no deformation or distortion occurs. Moreover, since the cut end of the net 22 is also adhesively held on the aluminum plate 20, a part of the net does not become deformed and fall off from there, and therefore, defective products due to deformation do not occur. In addition, since there is no deformation, it is possible to prevent unexpected situations such as shoots from occurring when attaching the display tube to the display tube, which will be described later. Furthermore, since a large number of shield nets can be manufactured by punching as described above, mass productivity is extremely excellent. Furthermore, since the net 22 is woven vertically and horizontally in a lattice pattern, a larger number of pieces can be punched out than when the net 22 is woven diagonally.

Shield Net 3 manufactured as above
1 is attached to the front surface of the display tube as shown in FIGS. 11 to 13, and this attached state will be explained next.

In the cabinet of the tuner 26, a frequency display tube 28 is fixed on a printed circuit board 29 for digitally displaying a predetermined frequency when a tuning button 27 is operated. The leads 30 of the display tube 28 are inserted and connected to this printed circuit board. The above-mentioned shield net 31 is arranged in front of the display section 35 of the display tube 28, and this shield net 31 is fixed by screwing a screw 33 into the metal part of the sub-panel 32 through the circular hole 25. A reddish acrylic plate 34 is fitted into an opening 36 of the sub-panel 32 provided corresponding to the display section 35 of the display tube 28, and a reddish acrylic plate 34 is fitted into the opening 36 of the sub-panel 32, which is provided in the front panel 37 and corresponding to the opening 36. A predetermined display color is produced by a transparent acrylic plate 39 fitted into the opening 38.

When the shield net 31 is installed in this way,
The radio waves emitted from the display section 35 of the display tube 28 can be grounded from the net 22 through the screw 33 and the sub-panel 32, and a desired shielding effect can be produced. In this case, Net22
has an aperture ratio to the extent that there is no problem in viewing the numerical display on the display section 35 from the front. The net 22 is an aluminum plate 20 having a shape corresponding to the display section 35.
Since it is always held at the top, it can be reliably installed in a predetermined position, and the circuit will not be shorted due to the net falling off, resulting in excellent installation stability and reliability.

Although the present invention has been described above with reference to one embodiment, this embodiment can be further modified based on the technical idea of the present invention. For example, the weaving method, shape, and material of the net 22 may be changed, and since conduction to the sub-panel 32 can be achieved through the net 22, instead of the aluminum plate 20, another material with sufficient stiffness can be used as the frame plate. It is also possible to use material such as thick paper as the frame board. Furthermore, the arrangement of the openings 24 in the steps shown in FIGS. 5 and 6 and the cutting method in the step shown in FIG. 7 can also be changed. Note that the present invention is not limited to frequency display tubes, but can of course be applied to other display tubes that emit radio waves.

As described above, the present invention involves attaching the other side of a double-sided adhesive tape with a release paper attached to one side to one side of a frame material, and punching out the frame material together with this double-sided adhesive tape with a release paper attached. A plurality of openings corresponding one-to-one to the display portions are formed in the frame material, and after peeling off the release paper from the double-sided adhesive tape, a shield is formed on one side of the frame material including the openings. Holding the shielding net on each frame by attaching the shielding net with the double-sided adhesive tape and cutting the frame material together with the shielding net between the plurality of openings. Since the shield net is divided into individual shield nets, the shield net can be manufactured with the easily deformable mesh body always held in a predetermined shape on the frame plate, and a shield net with a predetermined shape can be reliably obtained. . Therefore, it is possible to securely attach the display device to the display device, and also to prevent the net-like body from falling off, thereby achieving attachment stability and reliability.

Furthermore, since the mesh body can be divided into a large number of shield nets simply by cutting it together with the frame material, it is also excellent in mass production. Furthermore, since the net-like body was attached to the frame material using double-sided adhesive tape before being cut, the shape of the net-like body would be distorted when it was cut, and the accuracy in terms of shape and dimensions would deteriorate. The peripheral edge does not become distorted and fall off, and therefore, it is difficult to produce defective products, so the yield can be improved and productivity can be improved.

Also, since the other side of the double-sided adhesive tape with release paper attached to one side is attached to one side of the frame material, multiple openings can be formed by punching out the frame material even after the double-sided adhesive tape is attached. It is extremely easy to do so. Therefore, when processing the frame material, the double-sided adhesive tape can be processed at the same time, so the process of processing the double-sided adhesive tape and the troublesome process of pasting the double-sided adhesive tape onto the frame material after processing can be omitted. In addition to being able to increase productivity,
High-precision processing can be performed in which each shape and its attachment position are completely matched.

[Brief explanation of the drawing]

1 and 2 are plan views of two conventional shield nets, respectively. Figures 3 to 13
The drawings show an embodiment in which the present invention is applied to a frequency display tube, in which Fig. 3 is a plan view of an aluminum plate as a frame plate, Fig. 4 is a cross-sectional view taken along the - line in Fig. 3,
Figure 5 is a plan view of the aluminum plate shown in Figures 3 and 4 when punched, Figure 6 is a sectional view taken along the - line in Figure 5, and Figure 7 is the aluminum plate shown in Figures 5 and 6. Plan view of stainless steel net pasted on the board, No. 8
The figure is a sectional view taken along the line - - of Fig. 7, Fig. 9 is a plan view of the shield net obtained by cutting the shield net of Figs. 7 and 8, and Fig. 10 is a sectional view taken along the - line of Fig. Figure 11 is a front view of the frequency display section, Figure 12
The figure is a sectional view of the shield net attached to the front surface of the frequency display tube, and FIG. 13 is a sectional view similar to FIG. 12 of the main part showing the screwed portion of the shield net. In addition, in the symbols used in the drawings, 20
... Aluminum plate, 22 ... Stainless steel net, 23
...Double-sided adhesive tape, 28...Frequency display tube, 2
9...Printed circuit board, 31...Shield net,
32...Sub panel, 34, 39...Acrylic plate, 35...Display section, 37...Front panel.

Claims (1)

[Claims] 1. A method for manufacturing a shield net placed in front of a display section of a display device, in which the other side of a double-sided adhesive tape with a release paper attached to one side is attached to one side of a frame material. a step of forming a plurality of openings in the frame material in one-to-one correspondence with the display portions by punching out the frame material together with the double-sided adhesive tape with release paper; and the double-sided adhesive tape. a step of peeling off the release paper from the tape; a step of applying a shielding mesh to one side of the frame material including the openings using the double-sided adhesive tape; A method for producing a shield net for a display device, comprising the steps of dividing the shield net into individual shield nets held on individual frames by cutting the frame material.