JPH0717196Y2 - Electromagnetic shielding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an electromagnetic shield device for preventing interference due to external electromagnetic waves such as a cathode ray tube of a television receiver and a CRT display of a computer.

(Prior Art) When a television receiver or a computer is installed and used in a position close to an electromagnetic wave source such as a power transmission line, an image of a cathode ray tube or the like may be damaged due to the strong electromagnetic wave from the electromagnetic wave source. .

In order to prevent such obstacles, the surroundings of television receivers and computer CRT displays (hereinafter referred to as televisions) have been conventionally covered with a plate material made of a material having an electromagnetic shielding property to prevent the electromagnetic waves from the electromagnetic wave source. On the other hand, there is an electromagnetic shielding device that protects televisions and the like.

In the conventional electromagnetic shielding device, it is necessary to maintain the electromagnetic shielding performance at a high level. Therefore, a shielding material such as permalloy is formed into a square tube shape with no gaps by welding, etc., and then heat treated such as magnetic annealing to obtain a product. .

(Problems to be solved by the invention) Therefore, such a conventional electromagnetic shield device is complicated because it needs to be stored and transported in a rectangular tube shape.

Therefore, it is desired that a rectangular tube-shaped electromagnetic shielding device can be easily formed by using a flat plate material as a shielding material even in a customer or the like.

However, in the case of limited demand such as assembly tools, when assembling a flat plate material into a rectangular tube shape, a gap is generally apt to be formed at the corner where the edges of the flat plate material abut. Even if a flat plate material is simply used to form a rectangular tube, it is not possible to sufficiently secure the shielding performance due to the large gap.

The present invention has been made based on such a background, and provides an electromagnetic shielding device which has a good electromagnetic wave shielding performance and can be easily formed into a rectangular tube shape even at the customer site. It is intended.

(Means for Solving the Problems) To this end, the present invention uses four L-shaped shielding members, and one end of each shielding member has an end portion of another shielding member. In the electromagnetic shielding device having a rectangular tubular shape by overlapping the above, the shielding member has a frame material formed in an L shape, and a plate material made of a shielding material is bonded to the inside of the frame material. In addition, while arranging an angle member made of a shielding material along the inside of the bent portion of the frame member, and arranging a flat member made of a shielding material along the edge of the angle member inside the flat plate portion of the frame member, It is characterized in that the end portions on both sides of each of the shielding members are overlapped with each other to form a rectangular tube shape so that the angle members of each of the shielding members are connected by a flat plate member.

(Operation) According to the present invention, since the corners of the electromagnetic shielding device, which are apt to form the intervals, are formed by the angle members formed separately, the edges of the flat plate members are abutted with high accuracy. It is not necessary to form a corner, and the electromagnetic wave shielding performance at this corner is not impaired.

Therefore, even if the flat plate member and the angle member are connected to each other by a simple technique to form a rectangular tube, the electromagnetic wave shielding performance is not easily impaired, and the corners can be easily connected even in a limited demand such as assembly tools. It can be formed into a tubular shape.

As a result, the storage and transportation of the electromagnetic shielding device can be facilitated. In addition, in the electromagnetic shielding device according to the present invention, the angle member made of the shielding material is arranged along the inner side of the bent portion of the L-shaped frame member, and the angle member of the angle member is disposed inside the flat plate portion. Since a flat plate material made of a shielding material is arranged along the edge and adhered to each other, it is a shielding material even if distortion occurs in the angle material as a bent shape portion where distortion is remarkably generated. Since the angle material and the flat plate material are separate bodies, it is possible to prevent the distortion of the angle material from being directly transmitted to the flat plate material, and it is easy to securely bond the angle material and the flat plate material to the frame material respectively. The workability of assembling the electromagnetic shielding device is excellent.

(Embodiment) The present invention will be described below with reference to an embodiment shown in the drawings.

In FIG. 1, 1 is a television receiver and 2 is an electromagnetic shielding device.

As shown in FIG. 2, a cathode ray tube 3 and an electronic component 4 are installed inside the television receiver 1, and an electron gun portion 3 a of the cathode ray tube 3 is located at the back of the cathode ray tube 3.

As shown in FIG. 3, the electromagnetic shielding device 2 connects four shielding members 5 having the same shape to each other with an adhesive tape 6 to form a rectangular tube shape surrounding four peripheral surfaces of the television receiver 1. The electron gun portion 3a of the cathode ray tube 3 is formed within the width W of the electromagnetic shielding device 2 (FIG. 2).

Each shielding member 5 is formed as shown in FIGS. 4 and 5.

That is, the shielding member 5 has a frame member 7 formed by being bent in an L-shape, and two flat plate members 8 made of a permalloy plate member are provided on the inner surface of the flat plate portion 7b of the frame member 7 with a urethane material. On the inner surface side of the bent portion 7a of the frame member 7, an edge member 8a of the flat plate member 8 is overlaid with an angle member 9 made of permalloy having an L-shaped cross section, and urethane-based adhesive is applied. It is formed integrally by bonding with an agent.

The flat plate member 8 and the angle member 9 correspond to the plate member referred to in the present invention. Since they are made of permalloy which is a shielding material, they are formed into a predetermined shape in order to obtain a predetermined shielding performance. , It is necessary to magnetically anneal each.

The magnetic annealing treatment is carried out by heating the flat plate material 8 and the angle material 9 in vacuum at 1,050 ° C. to 1,100 ° C. for 1 to 2 hours and then gradually cooling them.

This magnetic annealing causes distortion in the flat plate material 8 and the angle material 9, but the distortion is particularly remarkable in the bent shape portion, and in Permalloy, when the shape is corrected after the magnetic annealing, the shield is obtained. It has the property of lowering the performance.

In consideration of such a situation, in the present invention, the angle member is formed separately from the flat plate member, and the angle member is adjusted to have a connection at the connection portion with the flat plate member to form a rectangular tube shape.

In this embodiment, the angle member 9 is bonded to the inner surface of the bent portion 7a of the frame member 7 inside the edge portion 8a of the flat plate member 8 so that the angle member 9 is bonded to the outside of the bent portion 9b of the angle member 9. A space corresponding to the plate thickness of the flat plate member 8 is formed between the frame member 7 and the frame member 7, so that the edge portion 9a of the angle member 9 is always in close contact with the flat plate member 8 regardless of the distortion of the angle member 9. It adheres to. By installing the angle member 9 in this way, the angle member 9 is arranged along the inside of the bent portion 7a, and at the same time, the flat plate member 8 is inside the flat plate portion 7b of the frame member 7 and the edge portion of the angle member 9 is inside. It is arranged along 9a.

The frame member 7 holds the flat plate member 8 and the angle member 9 having a strain in this manner by adhering the flat plate member 8 and the angle member 9 in a predetermined shape within an elastic limit range. Shielding member 5 with little variation in shape
Is formed. At this time, since the deformation of the flat plate member 8 and the angle member 9 is within the elastic limit, the shielding performance does not deteriorate.

In this embodiment, as the frame member 7, an aluminum alloy plate member is used outside the flat plate member 8 and the angle member 9.

Therefore, by performing anodizing treatment on the surfaces of these frame members 7 for coloring, the appearance of the electromagnetic shielding device 2 can be improved and a decorative effect in the room can be achieved.

The electromagnetic shielding device 2 is formed in a rectangular tube shape by using the four shielding members 5 thus formed.

That is, as is apparent from FIG. 1, the television receiver 1
The shielding members 5 are arranged at the respective corners, and the adjacent shielding members 5 are adhered to each other with the adhesive tape 6 to form the rectangular cylindrical electromagnetic shielding device 2.

In this case, it is important to arrange the flat plate materials 8 of the respective shielding members 5 in a state of overlapping with each other in order to maintain good shielding performance.

In the electromagnetic shielding device 2 formed in this way, the bent portion 7a of the frame member 7 and the bent portion 9b of the angle member 9 of each shielding member 5 are formed at the corners of the electromagnetic shielding device 2 in the shape of a rectangular tube.
Are positioned, and the bent portions 9b of these angle members 9 are connected by the flat plate member 8.

Therefore, at the corners of the electromagnetic shielding device 2, no gap is formed by the butt structure of the flat plate members, and the shielding performance is not impaired.

Further, since the shielding member 5 has an L shape and the flat plate members 8 are connected to overlap each other between the corners of the electromagnetic shielding device 2, various sizes can be obtained by adjusting the overlapping size. It can be used for the television receiver 1.

In order to provide the degree of freedom of connection between the shielding members 5 as described above, it is preferable to use or adhere the adhesive tape 6 as described above. Any adhesive structure may be adopted.

As described above, since the shielding material is the flat plate material 8 and the angle material 9, these shielding materials can be easily stored and transported.

Further, since the flat plate member 8 and the angle member 9 are attached to the frame member 7 formed in a substantially L-shape to form the shield member 5, the flat plate member 8 and the angle member 9 which are shield materials are attached to the frame member 7. Even when they can be attached, they can be stored and transported in a compact state by stacking them on top of each other by interposing a cushioning material or the like.

In this embodiment, the frame member 7 has been described as an aluminum alloy plate member bent in an L shape, but the invention is not limited to this, and the invention can be carried out with a steel plate member, a wooden member or a plastic member. The flat plate material 8 and the angle material 9 may be arranged on the outer surface of the frame material 7.

Further, in this embodiment, the permalloy plate material is used as the shielding material for the flat plate material 8 and the angle material 9, but other materials such as Fe-Si alloy, amorphous material, etc. may be used depending on the shielding performance expected of the electromagnetic shielding device 2. It can also be carried out using the above materials.

Further, in the connection structure of the flat plate member 8 and the angle member 9 in this embodiment, the edges of the both members are overlapped with each other, but the present invention is not limited to this and may be performed as follows.

That is, in the structure shown in FIG. 6, the angle member 9 is directly adhered to the bent portion 7a inside the frame member 7, and the edge members 8a of the flat plate member 8 are brought close to each other along the edge members 9a on both sides of the angle member 9. They are arranged and similarly adhesively fixed. In this case, the radius of curvature of the outside of the bent portion 9b of the angle member 9 is made larger than the radius of curvature of the inside of the bent portion 7a of the frame member 7, so that the angle member 9 can be framed regardless of the distortion of the angle member 9. The material 7 can be closely adhered to the inner surface of the material 7.

Then, by arranging the edge portions 8a of the flat plate members 8 in abutment with each other in the flat portion of the frame member 7, even if the flat plate members 8 and the angle members 9 are distorted, both of them are attached to the frame member 7. It is surely adhered, the edges of both are brought close to each other, and the gap formed can be made extremely small.

Therefore, there is an advantage that the deterioration of the shielding performance can be reduced to such an extent that it does not hinder practical use.

(Effect of the Invention) As described above, according to the present invention, since the corner portion of the electromagnetic shielding device in which the gap is apt to be formed is formed by the angle member formed separately, the edge portion of the flat plate member is formed. It is not necessary to form the corners by colliding with each other with high precision, and the electromagnetic wave shielding performance at the corners is not impaired.

Therefore, even if the flat plate member and the angle member are connected to each other by a simple technique to form a rectangular tube, the electromagnetic wave shielding performance is not easily impaired, and the corners can be easily connected even in a limited demand such as assembly tools. It can be formed into a tubular shape.

As a result, the storage and transportation of the electromagnetic shielding device can be facilitated. In addition, in the electromagnetic shielding device according to the present invention, the angle member made of the shielding material is arranged along the inner side of the bent portion of the L-shaped frame member, and the angle member of the angle member is disposed inside the flat plate portion. Since a flat plate material made of a shielding material is arranged along the edge and adhered to each other, it is a shielding material even if distortion occurs in the angle material as a bent shape portion where distortion is remarkably generated. Since the angle material and the flat plate material are separate bodies, it is possible to prevent the distortion of the angle material from being directly transmitted to the flat plate material, and it is easy to securely bond the angle material and the flat plate material to the frame material respectively. The workability of assembling the electromagnetic shielding device is excellent.

[Brief description of drawings]

FIG. 1 is a perspective view of an electromagnetic shielding device, FIG. 2 is a sectional view taken along line II-II of FIG. 1, and FIG. 3 shows a connecting structure of shielding members. FIG. 4 is a sectional view taken along line VV of FIG. 4, and FIG. 6 is a sectional view corresponding to FIG. 5 of a modified example. is there. 2; electromagnetic shielding device, 3; cathode ray tube, 5; shielding member, 6; adhesive tape, 7; frame material, 8; flat plate material, 9; angle material, 9b; bent portion.

Claims (1)

[Scope of utility model registration request] 1. An electromagnetic shield device in which four shield members formed in an L shape are used, and the end portions of the other shield member are overlapped with the end portions of both sides of the one shield member to form a rectangular tube shape. In the above, the shielding member has an L-shaped frame member,
A plate material made of a shielding material is adhered to the inside of the frame material, and an angle member made of the shielding material is arranged along the inside of the bent portion of the frame material, and the inside of the flat plate portion of the frame material is arranged. A flat plate member made of a shielding material is arranged along the edge of the angle member, and the end portions on both sides of each shielding member are overlapped with each other to form a rectangular tube shape, so that the angle members of each shielding member are separated from each other. An electromagnetic shield device characterized by being connected by a flat plate material.