JPH11112182A - Electromagnetic wave shield case and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve an electromagnetic wave shield function, by providing a second shield material with the electromagnetic wave shield function on the inner surface of a resin case being formed and machined so that a first shield material is partially buried. SOLUTION: A plate-shaped aluminum plate 14, for example, is subjected to press machining, and an adhesive 16 is applied to a part being buried in an ABS resin 18 later on the surface of the plate 14. Then, one part of the plate 14 is buried in the ABS resin 18 by insert forming or the like, and a case body 12 is completed. Primer 20 is applied onto the inner surface of the case body 12, the surface of the primer 20 is processed a copper plate 22, and a second shield is provided. After the process for providing the second shield, inner equipment 26 of an electronic component or the like is provided inside the case body 12 and, for example, a printed circuit board is fixed by a screw 24 when needed, thus securing the degree of freedom of the design and the internal capacity of the case body 12, and achieving an electromagnetic wave shield case 10A that is more superior than the constitution of either of the plate 14 or the copper plating 22 as the shield material while weight and production costs are being suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic wave shielding case and a method of manufacturing the same, and more particularly, to an electromagnetic wave shielding case in which a plurality of shielding materials are provided to enhance an electromagnetic wave shielding effect and a method of manufacturing the same. 2. Description of the Related Art In recent years, the development of electronic devices such as personal computers (PCs) has been remarkable, and many devices used in everyday life with a microprocessor incorporated therein have increased in number. These devices have been reduced in size, weight, and performance due to advances in semiconductor technology and the like.
Due to the influence of U and the like, electromagnetic waves that are stronger than before have been generated around devices.

[0002] In addition, with the widespread use of the above-mentioned devices in daily life, the environment has been placed in an environment susceptible to external weak electromagnetic waves. as a result,
Malfunctions of electronic devices due to electromagnetic waves, erroneous control of machines, traffic accidents, adverse effects on medical equipment and health, and the like have become problems. In general, as one of the electromagnetic wave shielding technologies, shielding of equipment with sheet metal, addition of parts such as ferrite to printed circuit boards and interfaces, plating inside the housing, etc. are performed, but those with insufficient electromagnetic wave shielding effect Therefore, there is a demand for a housing having an excellent electromagnetic wave shielding effect and a method of manufacturing the housing.

[0003]

2. Description of the Related Art Conventionally, a housing is made of a resin such as an ABS (Acrylonitrile Butadiene Styrene) resin which does not have an electromagnetic wave shielding effect due to reasons such as cost, productivity, design freedom, and weight reduction. General,
In order to give an electromagnetic wave shielding effect to the resin housing, first, a metal having an electromagnetic wave shielding function such as copper or nickel is formed on the inner surface of the resin housing by plating, vapor deposition or the like,
Secondly, there is a resin casing in which a conductive paint is applied to the inner surface thereof, and thirdly, a metal plate having an electromagnetic wave shielding function is adhered to the inner surface of the resin casing.

Further, in order to enhance the electromagnetic wave shielding effect of the resin housing, a printed circuit board or electronic components inside the resin housing are supported by a spring or an aluminum block from a metal layer such as plating on the inner surface of the resin housing and grounded. There is also.

[0005]

However, when the electromagnetic wave shielding casing is configured as described above, there are some problems as follows. First, in order to provide an electromagnetic wave shielding function to the resin housing, if only plating, vapor deposition film, conductive paint, metal plate, etc. having an electromagnetic wave shielding effect are provided on the resin housing surface, these thicknesses are Generally very thin,
In many cases, it did not fulfill a sufficient electromagnetic wave shielding function.

Here, metal plating is applied to the inner surface of the resin housing,
In a method of forming a film such as a vapor-deposited film, if an attempt is made to achieve a film thickness sufficient to achieve a desired electromagnetic wave shielding function, the film formation time becomes long, the formation efficiency is poor, and the cost is disadvantageous. . In addition, in order to enhance the electromagnetic wave shielding effect by thickly applying a conductive paint, there is an adhesive problem such as peeling or turning up of the conductive paint, and in the method of increasing the electromagnetic wave shielding function by further thickening the metal plate, There are problems such as a decrease in the degree of freedom in the design of the resin housing, an increase in the number of parts, an increase in weight, and an increase in cost.

In other words, a single electromagnetic wave shielding method, such as forming a film on the inner surface of a resin housing, applying a conductive paint, and increasing the thickness of a metal plate, has the above technical, quality, and price problems. However, there is a problem that the housing cannot have a sufficient electromagnetic wave shielding function. Second, in order to enhance the electromagnetic wave shielding effect of the resin housing, a spring or aluminum block is arranged on a metal layer such as plating on the inner surface of the resin housing, and the printed circuit board and electronic components inside the housing are supported and grounded. In the method, since the spring or the aluminum block is added as a part, there is a problem that the weight of the entire product is increased, the internal space of the resin housing is narrowed, or the volume of the entire product is increased.

The present invention has been made in view of the above points, and provides a plurality of electromagnetic wave shielding materials provided inside a resin housing, and provides an electromagnetic wave shielding housing having an excellent electromagnetic wave shielding function and a method of manufacturing the same. The purpose is to:

[0009]

Means for Solving the Problems In order to solve the above problems, the present invention is characterized by taking the following means. According to the first aspect of the present invention, there is provided an electromagnetic wave having a housing body made of a first shielding material having an electromagnetic wave shielding function, and a resin molded to at least partially bury the first shielding material therein. In the shield housing, the housing main body is provided with a second shield member having an electromagnetic wave shielding function on an inner surface.

[0010] According to the second aspect of the present invention, in the first aspect,
In the electromagnetic shield housing described in the above, the second shield material is a shield film formed on the inner surface of the housing body. Claim 3
In the invention described in claim 1, in the electromagnetic wave shielding casing according to claim 1, the second shielding material is formed of a shielding paint obtained by mixing a paint and a shielding metal powder having an electromagnetic wave shielding function, and the shielding paint is formed of the casing. It is characterized by being applied to the inner surface of the main body.

Further, according to the invention described in claim 4, according to claim 1,
In the above-mentioned electromagnetic wave shielding case, the second shield material is a shield metal plate formed so as to correspond to a shape of an inner surface of the case main body. Further, according to the invention described in claim 5, according to claim 1
5. The electromagnetic shielding casing according to any one of claims 4 to 4, wherein a third shielding material having an electromagnetic shielding function is further provided on a surface of the second shielding material.

Further, according to the invention described in claim 6, according to claim 5,
In the electromagnetic wave shielding case described above, the third shield member is a shield film formed on the surface of the second shield member. According to a seventh aspect of the present invention, in the electromagnetic wave shielding casing according to the fifth aspect, the third shield member is made of a shield paint obtained by mixing a paint and a shield metal powder having an electromagnetic wave shielding function. A paint is applied to a surface of the second shield material.

According to the invention described in claim 8, in claim 5,
In the above-mentioned electromagnetic wave shielding casing, the third shield member is a shield metal plate formed so as to correspond to the shape of the second shield member. According to the ninth aspect of the present invention, the casing body is formed by molding a first shielding material having an electromagnetic wave shielding function, and then molding a resin so that the first shielding material is embedded at least partially. After the manufacturing step of the housing body to be manufactured, a second shield arranging step of arranging a second shielding material having an electromagnetic wave shielding function on the inner surface of the housing body is performed.

According to a tenth aspect of the present invention, in the method of manufacturing an electromagnetic wave shielding case according to the ninth aspect, the second shield material is a shield film having an electromagnetic wave shielding function. It is. According to the eleventh aspect of the present invention, in the method for manufacturing an electromagnetic wave shielding case according to the ninth aspect, the second shield material is made of a shield paint in which a paint and a shield metal powder having an electromagnetic wave shielding function are mixed. And applying the shielding paint to the inner surface of the housing body.

According to a twelfth aspect of the present invention, in the method of manufacturing an electromagnetic wave shielding case according to the ninth aspect, the second shielding member is formed so as to correspond to the shape of the inner surface of the housing body. Characterized in that it is a shielded metal plate. According to a thirteenth aspect of the present invention, in the method for manufacturing an electromagnetic wave shield casing according to any one of the ninth to twelfth aspects, after the second shield disposing step, an electromagnetic wave is applied to the surface of the second shield material. A third shield arranging step of further arranging a third shield material having a shielding function is performed.

According to a fourteenth aspect of the present invention, in the method for manufacturing an electromagnetic wave shielding case according to the thirteenth aspect, the third shield member is a shield film having an electromagnetic wave shielding function. is there. According to a fifteenth aspect of the present invention, in the method for manufacturing an electromagnetic wave shielding case according to the thirteenth aspect, the third shield member is made of a shield paint obtained by mixing paint and a shield metal powder having an electromagnetic wave shielding function. And applying the shielding paint to the surface of the second shielding material.

Further, according to the sixteenth aspect, in the first aspect,
3. The method for manufacturing an electromagnetic wave shield casing according to claim 3, wherein the third shield member is a shield metal plate formed so as to correspond to the shape of the second shield member. Each of the above means operates as follows.

According to the first and ninth aspects of the present invention, in the electromagnetic wave shielding housing in which one electromagnetic wave shielding material is embedded, another new shielding material is disposed on the inner surface of the electromagnetic wave shielding material. In addition, the housing main body can exhibit more excellent electromagnetic wave shielding functionality than the electromagnetic wave shielding housing including one shield material while keeping the thickness of the housing main body thin.

According to the second and tenth aspects of the present invention, the shielding material newly added to the housing body is a shielding film formed on the inner surface of the housing body, and the shielding film has a thickness. Because it is thin, uniform and smooth, the body of the housing is not so limited in the degree of freedom of the design of the body of the housing and the volume inside the housing itself, and the thickness of the housing body is reduced without increasing the weight of the housing itself. It is possible to exhibit an electromagnetic wave shielding function superior to an electromagnetic wave shielding housing provided with one shield material while keeping it.

According to the third and eleventh aspects of the present invention, the shielding material to be newly added to the housing body is a shielding paint obtained by mixing a coating material applied on the inner surface of the housing body and a shielding metal powder. The coating can be realized with simple equipment and processes, and the film thickness is reduced, so that the housing main body is provided with one shielding material while keeping the thickness of the housing main body thin. Electromagnetic wave shielding function superior to that of the above can be exhibited.

According to the fourth and twelfth aspects of the present invention, the shield material to be newly added to the housing body is a shield metal plate formed so as to correspond to the shape of the inner surface of the housing body. By changing the thickness of the shield metal plate or adjusting the arrangement position of the shield metal plate, the housing body is provided with one shield material while keeping the thickness of the housing body thin. More effective shielding electromagnetic wave shielding functionality can be exhibited.

According to the fifth and thirteenth aspects of the present invention, the shield material to be newly added to the housing main body is a second shield material provided on the inner surface of the housing main body. The third shielding material, and the addition of the shielding material makes the housing body superior to the electromagnetic shielding housing having one or two shielding materials while keeping the thickness of the housing body thin. Electromagnetic wave shielding functionality can be exhibited.

According to the present invention, the shield material newly added to the housing is a shield film formed on the surface of the second shield material, and has a small and uniform thickness. Because of the smoothness, there is not much restriction on the degree of freedom in the design of the housing body and the volume inside the housing body, and the housing body can be kept thin without increasing its weight.
Electromagnetic wave shielding functionality superior to an electromagnetic wave shielding housing provided with one or two shielding materials can be exhibited.

According to the seventh and fifteenth aspects of the present invention, the shield material newly added to the housing is a shield film formed on the surface of the second shield material, and the shield film is very thin. Therefore, the shielding film, which is the second shielding material, is prevented from peeling and turning up, and the housing body is better than the electromagnetic wave shielding housing having one or two shielding materials while keeping the thickness of the housing body thin. The electromagnetic wave shielding function can be exhibited.

According to the present invention, the shield material to be newly added to the housing body is a shield metal plate formed so as to correspond to the surface shape of the second shield material. Yes, by changing the thickness of the shield metal plate or adjusting the position of the shield metal plate, the shield paint, which is the second shield material, is prevented from peeling and turning up, and the electromagnetic shield housing is an effective shield electromagnetic wave Shield functionality can be exhibited.

[0026]

Next, embodiments of the present invention will be described with reference to the drawings. First, the configuration of an electromagnetic wave shielding case 10A according to a first embodiment of the present invention will be described with reference to FIG. 1 which is a cross-sectional view of the electromagnetic wave shielding case 10A. The electromagnetic wave shielding casing 10A is roughly composed of a casing main body 12, an aluminum plate (hereinafter abbreviated as an aluminum plate) 14, an adhesive 16, an ABS (Acrylonotrile Butadiene Styrene).
) Resin 18, primer 20, copper plating 22, screw 2
4. It is composed of an internal device 26 and the like.

The housing body 12 is made up of an aluminum plate 14 and an ABS resin 18.
It is embedded in the BS resin 18 by insert molding or the like. The aluminum plate 14 is formed by pressing a plate-shaped aluminum material, for example, and performs an electromagnetic wave shielding function as a first shielding material in the housing body 12 of the electromagnetic wave shielding housing 10A.

In this embodiment, the aluminum plate 14 is used as the first shielding material. In addition to aluminum, zinc, iron, lead, copper, silver, gold, nickel, cobalt, chromium, titanium, tin, Magnesium and its alloys may be used. However, since a substance having higher conductivity and magnetic permeability generally has a higher electromagnetic wave shielding property, it is desirable to use a structure using copper, nickel, super permalloy or the like in addition to aluminum used in this embodiment as the first shielding material.

The ABS resin 18 is a polymer formed by copolymerization of acrylonitrile, butadiene, and styrene. The ABS resin 18 has both hardness and impact resistance, and a plating process is established as a material to be plated. Because of its beautiful finish, it is widely used as a housing manufacturing material. The adhesive 16 is made of aluminum plate 14 and A
The BS resin 18 is bonded.

The primer 20 is an acrylic resin-based insulating material. The primer 20 is formed by contact between the copper plating 22 and the aluminum plate 14 in order to improve the adhesion of the copper plating 22 to the inner surface of the housing body 12. It is applied to prevent corrosion. In this embodiment, the primer 20 is made of an acrylic resin paint. However, instead of the acrylic resin paint used in the present embodiment, a configuration in which a polyurethane, polyester, or epoxy resin paint is used may be used. .

The copper plating 22 exhibits an electromagnetic wave shielding function as a second shielding material. However, since the copper plating 22 is very thin, there is an advantage that the internal volume of the housing body 12 is not reduced. In this embodiment, the shield film is made of copper plating. However, in addition to copper, aluminum, zinc, iron, lead, copper, silver, gold, nickel, cobalt, chromium, titanium, tin, and magnesium are used as the shield film material. And alloys thereof.

The screw 24 is one of fixing members for fixing the internal device 26. The screw 24 penetrates from the internal device 26 to the aluminum plate 14 through the copper plating 22.
Thereby, the inner device 26 which is the innermost layer, the copper plating 2
2. Further, the outermost layer of the aluminum plate 14 is securely electrically connected to improve the electromagnetic wave shielding function of the housing body 12.

The internal device 26 is an electronic device such as a printed circuit board included in the electromagnetic wave shielding casing main body 10A.
Next, the electromagnetic wave shielding casing 10 according to the first embodiment of the present invention is described.
The manufacturing method of A will be described with reference to FIGS. To manufacture the electromagnetic shielding housing 10A, first, the housing main body 12 is formed as a housing main body manufacturing process.

In the case body manufacturing process, first, for example, press forming is performed on the plate-like aluminum plate 14 shown in FIG. 2A, as shown in FIG. 2B. Next, as shown in FIG. 2 (C), the ABS resin 1
The adhesive 16 is applied to a portion to be embedded in the substrate 8. Thereafter, as shown in FIG. 2D, a part of the aluminum plate 14 is embedded in the ABS resin 18 by insert molding or the like, thereby completing the housing body 12.

After the housing body manufacturing process, the process proceeds to the second shield disposing step as shown in FIG. In the second shield disposing step of the first embodiment, the housing body shown in FIG.
As shown in FIG. 3 (B), a primer 20 is applied to the inner surface of the housing body 12, and subsequently, as shown in FIG. 3 (C), a copper plating 22 is applied to the surface of the primer 20. After the second shield disposing step, an internal device 26 such as an electronic component is disposed inside the housing body 12, and the printed circuit board and the like are fixed using screws 24 as necessary.

The copper plating 22 is formed by electroless plating in which copper ions in a plating solution are precipitated as copper by a chemical reaction using formaldehyde as a reducing agent.
In addition, other than the electroless plating applied in the present embodiment, there are a vacuum deposition method, an ion plating, a sputtering, and the like as a shield film forming method, and a shield film forming method suitable for a shield material to be used is adopted. Thus, it is desirable to form a shield film of two or more layers by combining the above-mentioned shield material and a method of forming a shield film.

Here, if the electromagnetic wave shielding function of the electromagnetic wave shielding case 10A is to be enhanced only with the aluminum plate 14, it is necessary to increase the thickness of the aluminum plate 14 or to increase the area. There are problems such as a lack of freedom in the design of the main body 12, an increase in the weight of the housing main body 12, and an increase in cost due to the additional aluminum plate.

In order to enhance the electromagnetic wave shielding function of the electromagnetic wave shielding casing 10A only by copper plating, it is necessary to increase the thickness of the copper plating, but it is necessary to realize a film thickness sufficient to achieve the desired electromagnetic wave shielding function. In this case, the film formation time becomes longer, the formation efficiency becomes poor, and the cost becomes disadvantageous. Therefore, by using both the aluminum plate 14 and the copper plating 22 as the shielding material as in the first embodiment of the present invention, the excellent electromagnetic wave shielding function of the aluminum plate 14 and the uniform and extremely thin shielding of the copper plating are achieved. The advantage of both shield materials that a film can be formed can be utilized.

That is, the freedom of design and the internal volume of the housing body 12 are ensured, and the weight and production cost are reduced.
It is possible to realize an electromagnetic wave shielding casing 10A having an electromagnetic wave shielding function superior to the case where one of the aluminum plate 14 and the copper plating 22 is used as a shielding material. Next, a configuration of an electromagnetic wave shielding case 10B according to a second embodiment of the present invention will be described with reference to FIG. 4 which is a sectional view of the electromagnetic wave shielding case 10B.

The electromagnetic wave shield 10B is roughly composed of a housing body 12, an aluminum plate 14, an adhesive 16, an ABS resin 1
8, a screw 24, an internal device 26, a shield paint 28, and the like. Here, the housing body 12, the aluminum plate 14, the adhesive 16, the ABS resin 18, the screw 24, and the internal device 26 are the same as those in the first embodiment, and therefore the description is omitted.

The shield paint 28 is applied on the inner surface of the housing body 12 and includes, for example, a paint 30 based on acrylic, polyurethane, polyester, epoxy resin or the like and carbon, titanium oxide, ferrite, aluminum, zinc. And a shield metal powder 32 which is a mixture of at least one of powders of iron, lead, copper, silver, gold, nickel, cobalt, chromium, titanium, tin, magnesium and alloys thereof, and has an electromagnetic wave shielding function. Since the metal powder 32 is mixed, it performs an electromagnetic wave shielding function as a second shielding material.

Next, a method for manufacturing an electromagnetic wave shielding casing 10B according to a second embodiment of the present invention will be described with reference to FIG.
First, as described in the first embodiment, after the housing main body 12 shown in FIG. 5A is formed in the housing main body manufacturing process, as shown in FIG. Then, a shield paint 28 is applied to the inner surface of the housing body.

After the application of the shield paint 28, the housing body 12
The internal device 26 is disposed inside the device, but the disposition of the internal device 26 is omitted since it has been described in the first embodiment. Here, the electromagnetic wave shielding casing 10B is made of only the shielding paint 28.
In order to enhance the electromagnetic wave shielding function, it is necessary to apply a thick coating of the shielding paint 28, but it is technically difficult to apply the thick coating of the shielding paint 28, and there is a problem that the shielding paint 28 is peeled off and turned up.

Therefore, as in the second embodiment of the present invention, by forming both the aluminum plate 14 and the shield paint 28 as a shield material, the excellent electromagnetic wave shielding function of the aluminum plate 14 and the thinness of the shield paint and the coating quality can be obtained. The advantages of both shielding materials, that is, easiness, can be utilized. That is, the housing body 1
2. An electromagnetic wave shielding casing 10B having an electromagnetic wave shielding function that is superior to the case where one of the aluminum plate 14 and the shielding paint 28 is used as a shielding material while securing the degree of freedom of design and suppressing weight and production cost. Can be realized.

Next, the structure of an electromagnetic wave shielding case 10C according to a third embodiment of the present invention will be described with reference to FIG. 6, which is a sectional view of the electromagnetic wave shielding case 10C. The electromagnetic wave shielding casing 10C is roughly composed of a casing main body 12, an aluminum plate 14, an adhesive 16, an ABS resin 18, a screw 24, an internal device 26,
It is composed of a primer 20, an aluminum plate 15, and the like.

The housing body 12, the aluminum plate 14,
Adhesive 16, ABS resin 18, screw 24, internal equipment 2
6. Since the primer 20 is the same as in the first embodiment, the description is omitted. Here, the aluminum plate 15 is provided on the inner surface of the housing main body 12 via the primer 20, and has the same properties and functions as those of the aluminum plate 14, and is formed by pressing a plate-like aluminum material, for example, by press forming. It is.

Next, a method of manufacturing an electromagnetic wave shielding casing 10C according to a third embodiment of the present invention will be described with reference to FIG.
First, as described in the first embodiment, after the housing main body 12 is formed in the housing main body manufacturing process as shown in FIG. 7A, as shown in FIG. A primer 20 is applied to the inner surface of the housing body 12 as shown,
Thereafter, as shown in FIG. 7C, an aluminum plate 15 formed and processed in accordance with the inner surface of the housing body 12 is provided.

After the aluminum plate 15 is provided, the housing body 12
The internal device 26 is disposed inside the device, but the disposition of the internal device 26 is omitted since it has been described in the first embodiment. The aluminum plate 15 has the same properties and functions as the aluminum plate 14, but the aluminum plate 1 is placed in a place where electromagnetic wave shielding is required.
By arranging 5 or by adjusting the thickness of the aluminum plate 15 as necessary, an effective electromagnetic wave shielding casing 10C can be realized.

Next, the structure of an electromagnetic shield case 10D according to a fourth embodiment of the present invention will be described with reference to FIG. 8 which is a sectional view of the electromagnetic shield case 10D. The electromagnetic wave shielding casing 10D is roughly composed of a casing main body 12, an aluminum plate 14, an adhesive 16, an ABS resin 18, a screw 24, an internal device 26,
It is composed of an acrylic sheet 34, copper plating 22, and the like.

Here, the housing body 12, the aluminum plate 14,
Adhesive 16, ABS resin 18, Copper plating 22, Screw 2
4. Since the internal device 26 is the same as in the first embodiment, the description is omitted. The acrylic sheet 34 is a sheet made of an acrylic resin-based insulating material. The acrylic sheet 34 is used to improve the adhesion of the copper plating 22 to the inner surface of the housing body 12 and to contact the copper plating 22 with the aluminum plate 14. Provided to prevent corrosion.

Here, since the acrylic sheet 34 is very thin processed into a uniform thickness, the adhesion of the copper plating 22 is improved and the insulating effect is exhibited while keeping the internal volume of the housing body 12 wide. be able to. In this embodiment, the acrylic sheet 34 is used.
Instead, a sheet made of nylon, polyester, polyimide or the like may be used.

Next, a description will be given of a method of manufacturing an electromagnetic shield case 10D according to a fourth embodiment of the present invention with reference to FIG.
First, as described in the first embodiment, after the casing main body 12 shown in FIG. 9A is formed in the casing main body manufacturing process, as shown in FIG. Then, an acrylic sheet 34 is provided on the inner surface of the housing body 12, and then the surface of the acrylic sheet 34 is copper-plated by electroless plating as shown in FIG. 9C.

After the copper plating, the internal equipment 26 is disposed inside the housing body 12, but the arrangement of the internal equipment 26 has been described in the first embodiment and will not be described. The effect of using both the aluminum plate 14 and the copper plating 22 as the electromagnetic wave shielding material is as already described in the first embodiment of the present invention. Here, FIG. 10 shows an experimental result by the Advantest method performed on the fourth embodiment. FIG.
In the graph, the dotted line is an electromagnetic wave shielding case 10d having only an aluminum plate 14 as a shielding material, and the solid line in the graph is an acrylic sheet An experimental result is shown via 34 as a sample of the electromagnetic wave shielding housing 10D having the copper plating 22 by the electroless plating method.

FIG. 11 shows the principle of the experiment by the Advantest method. As shown in FIG. 11, the Advantest method refers to a method in which a transmitting antenna 36 and a receiving antenna 38 are arranged with an electromagnetic wave shielding casing as a sample interposed therebetween, and the distance between the transmitting antenna 36 and the receiving antenna 38 is variously changed. The analyzer 40 evaluates the electromagnetic wave shielding function of the electromagnetic wave shielding casing by measuring the difference between the intensity of the electromagnetic wave emitted from the electromagnetic wave 36 and the intensity of the electromagnetic wave received by the receiving antenna 38 through the sample with the analyzer 40.

As shown in FIG. 10, it can be seen that the electromagnetic wave shielding function of the electromagnetic wave shielding case 10D is superior to that of the electromagnetic wave shielding case 10d especially in a high electromagnetic wave frequency band. Next, the configuration of an electromagnetic wave shielding case 10E according to a fifth embodiment of the present invention will be described with reference to FIG. 12 which is a cross-sectional view of the electromagnetic wave shielding case 10E. Electromagnetic wave shield case 10E
Are generally a housing body 12, an aluminum plate 14, an adhesive 1
6, ABS resin 18, screws 24, internal equipment 26, shield paint 28, copper plating 22, and the like.

Here, the housing body 12, the aluminum plate 14,
Adhesive 16, ABS resin 18, screw 24, internal equipment 2
6, the copper plating 22, and the shield paint 28 are the same as those in the first and second embodiments, and the description is omitted. In the present invention, as shown in FIG. 13B, a shield paint 28 is applied to the inner surface of the housing body 12 as a second shield disposing step for the housing body 12 shown in FIG. After that, as shown in FIG.
As shown in (C), the surface of the shield paint 28 is subjected to copper plating by electroless plating described in the first embodiment of the present invention.

After the copper plating is performed, the internal device 26 is disposed inside the housing body 12, but the disposition of the internal device 26 is omitted since it has been described in the first embodiment. The present invention is characterized in that the electromagnetic wave shielding function of the electromagnetic wave shielding casing 10E is improved by disposing a copper plating 22 as a third shielding material on the surface of the shielding paint 28 of the second embodiment. .

By providing the copper plating 22 on the surface of the shield paint 28 as in this embodiment, the shield paint 28 is prevented from peeling and turning up, and the inner surface of the housing body 12 is finished smoothly. Becomes possible. Therefore, the housing body can exhibit more excellent electromagnetic wave shielding functionality than an electromagnetic wave shielding housing provided with one or two shielding materials while keeping the thickness of the housing body thin.

Next, the configuration of an electromagnetic wave shielding case 10F according to a sixth embodiment of the present invention will be described with reference to FIG. 14 which is a sectional view of the electromagnetic wave shielding case 10F. The electromagnetic wave shielding casing 10F is roughly composed of a casing main body 12, an aluminum plate 14,
Adhesive 16, ABS resin 18, screw 24, internal equipment 2
6, the shield paint 28, the aluminum plate 17, and the like.

Here, the housing body 12, the aluminum plate 14,
Adhesive 16, ABS resin 18, screw 24, internal equipment 26
Is the same as in the first embodiment, and the shield paint 28 and the second aluminum plate 17 are the same as those in the second and third embodiments, and therefore, the description thereof is omitted. In the present invention, a shield paint 28 is applied to the inner surface of the housing body 12 as shown in FIG. 15B as a second shield disposing step for the housing body 12 shown in FIG. After that, as a third shield disposing step, FIG.
As shown in the figure, an aluminum plate 17 formed in accordance with the shape of the shield paint 28 described in the third embodiment of the present invention is disposed on the surface of the shield paint 28.

After the copper plating is performed, the internal device 26 is disposed inside the housing body 12, but the disposition of the internal device 26 has been described in the first embodiment and will not be described. Here, by disposing the aluminum plate 17 on the surface of the shield paint 28, peeling and turning-up of the shield paint 28 can be prevented, and the inner surface of the housing body 12 can be finished smoothly.

The aluminum plate 17 has the same properties and functions as the aluminum plate 14, but the aluminum plate 17 is disposed at a place where electromagnetic wave shielding is required, or the thickness of the aluminum plate 17 is changed as necessary. The electromagnetic wave shielding function of the electromagnetic wave shielding casing 10F can be effectively exerted by adjusting and arranging.

[0063]

According to the present invention as described above, the following various effects can be realized. According to the first and ninth aspects of the present invention, since two shield materials are used, the electromagnetic wave shielding function of the electromagnetic wave shield housing can be improved. According to the second and tenth aspects of the present invention, since the shielding film is very thin, the electromagnetic wave shielding of the electromagnetic wave shielding housing can be performed without increasing the weight of the housing main body or reducing the internal volume of the housing main body. Function can be improved.

According to the third and eleventh aspects of the present invention, since the shield coating can be easily applied, the production process is facilitated, and the shielding material is arranged on the inner surface of the electromagnetic wave shielding casing at low cost. With this arrangement, the electromagnetic wave shielding function can be improved. Claims 4 and 1
According to the invention described in (2), since the aluminum plate is divided into two layers and used, an effective electromagnetic wave shield can be performed on a portion where an electromagnetic wave shield is required.

According to the fifth and thirteenth aspects of the present invention, since the thin sheet is used as the insulator, the electromagnetic wave shielding function of the electromagnetic wave shielding housing can be maintained while keeping the volume inside the housing wide. Can be improved. Also,
According to the invention of claims 6 and 14, the shielding material is
Since one or two shielding materials are used, the electromagnetic wave shielding function of the electromagnetic wave shielding casing can be further enhanced as compared with using one or two shielding materials.

According to the seventh and fifteenth aspects of the present invention, since a film is formed on the surface of the shield paint, the shield paint is prevented from peeling and turning up, and an electromagnetic wave shield housing having a smooth inner surface is realized. The electromagnetic wave shielding function of the electromagnetic wave shielding housing can be improved. Furthermore, according to the invention of claims 8 and 16, since the aluminum plate is disposed on the surface of the shield paint, the shield paint is prevented from peeling and turning up, and the electromagnetic wave shield casing has a smooth surface and a high electromagnetic wave shield function. Can be realized.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a configuration of an electromagnetic wave shielding housing according to a first embodiment of the present invention.

FIG. 2 is a diagram for explaining a method of manufacturing a housing body according to the present invention.

FIG. 3 is a view for explaining a method of manufacturing the electromagnetic wave shielding casing according to the first embodiment of the present invention.

FIG. 4 is a view for explaining a configuration of an electromagnetic wave shielding housing according to a second embodiment of the present invention.

FIG. 5 is a view for explaining a method for manufacturing an electromagnetic wave shielding casing according to a second embodiment of the present invention.

FIG. 6 is a view for explaining a configuration of an electromagnetic wave shielding housing according to a third embodiment of the present invention.

FIG. 7 is a view for explaining a method of manufacturing the electromagnetic wave shielding casing according to the third embodiment of the present invention.

FIG. 8 is a view for explaining a configuration of an electromagnetic wave shielding housing according to a fourth embodiment of the present invention.

FIG. 9 is a view for explaining a method of manufacturing an electromagnetic wave shielding casing according to a fourth embodiment of the present invention.

FIG. 10 is a diagram showing an experimental result obtained by performing an advanced test method on a fourth embodiment of the present invention.

FIG. 11 is a diagram for explaining an advanced test method.

FIG. 12 is a view for explaining a configuration of an electromagnetic wave shielding housing according to a fifth embodiment of the present invention.

FIG. 13 is a view illustrating a method of manufacturing the electromagnetic wave shielding casing according to the fifth embodiment of the present invention.

FIG. 14 is a view for explaining a configuration of an electromagnetic wave shielding housing according to a sixth embodiment of the present invention.

FIG. 15 is a view illustrating a method of manufacturing the electromagnetic wave shielding casing according to the sixth embodiment of the present invention.

[Explanation of symbols]

 10A to 10F Electromagnetic wave shielding housing 12 Housing main body 14, 15, 17 Aluminum plate 16 Adhesive 18 ABS resin 20 Primer 22 Copper plating 24 Screw 26 Internal equipment 28 Shield paint 30 Paint 32 Shield metal powder 34 Acrylic sheet 36 Transmission antenna 38 Receiving antenna 40 Analyzer

Claims (16)

[Claims] 1. An electromagnetic wave shielding housing comprising a housing main body made of a first shielding material having an electromagnetic wave shielding function and a resin molded so as to bury at least a part of the first shielding material therein. 3. The electromagnetic wave shielding case according to claim 1, wherein a second shielding material having an electromagnetic wave shielding function is provided on an inner surface of the case main body. 2. The electromagnetic wave shielding case according to claim 1, wherein the second shield material is a shield film formed on an inner surface of the case main body. 3. The electromagnetic wave shielding casing according to claim 1, wherein the second shielding material is made of a shielding paint obtained by mixing a paint and a shielding metal powder having an electromagnetic wave shielding function, and the shield paint is made of the casing. An electromagnetic wave shielding housing, which is applied to an inner surface of a main body. 4. The electromagnetic shield housing according to claim 1, wherein the second shield member is a shield metal plate formed so as to correspond to a shape of an inner surface of the housing body. Electromagnetic shielding case. 5. The electromagnetic shielding casing according to claim 1, further comprising a third shielding member having an electromagnetic shielding function provided on a surface of the second shielding member. Electromagnetic shielding case. 6. The electromagnetic wave shield case according to claim 5, wherein the third shield member is a shield film formed on a surface of the second shield member. 7. The electromagnetic wave shielding casing according to claim 5, wherein the third shield material is made of a shield paint obtained by mixing a paint and a shield metal powder having an electromagnetic wave shielding function, wherein the shield paint is the second paint. An electromagnetic wave shielding housing, which is applied to a surface of a shielding material. 8. The electromagnetic wave shielding casing according to claim 5, wherein the third shield member is a shield metal plate formed so as to correspond to a shape of the second shield member. Electromagnetic shield case. 9. A housing body for manufacturing a housing body by forming and processing a first shield material having an electromagnetic wave shielding function, and thereafter forming and processing a resin so that the first shield material is embedded at least partially. A method for manufacturing an electromagnetic wave shielding case, comprising: performing a second shield disposing step of disposing a second shielding material having an electromagnetic wave shielding function on an inner surface of the case main body after the manufacturing step. 10. The method according to claim 9, wherein the second shield member is a shield film having an electromagnetic wave shielding function. 11. The method for manufacturing an electromagnetic wave shielding casing according to claim 9, wherein the second shield material is made of a shield paint obtained by mixing a paint and a shield metal powder having an electromagnetic wave shielding function, and A method of manufacturing an electromagnetic wave shielding case, wherein the method is applied to an inner surface of the case main body. 12. The method according to claim 9, wherein the second shield member is a shield metal plate formed and formed so as to correspond to a shape of an inner surface of the housing body. A method for manufacturing an electromagnetic wave shielding housing, characterized by comprising: 13. The method for manufacturing an electromagnetic wave shielding case according to claim 9, wherein after the second shield arranging step, the surface of the second shield material has an electromagnetic wave shielding function. A method for manufacturing an electromagnetic wave shielding casing, comprising performing a third shield disposing step of further disposing a third shield material. 14. The method according to claim 13, wherein the third shield member is a shield film having an electromagnetic wave shielding function. 15. The method for manufacturing an electromagnetic wave shielding casing according to claim 13, wherein the third shield material is made of a shield paint obtained by mixing a paint and a shield metal powder having an electromagnetic wave shielding function, and the shield paint is formed. A method for manufacturing an electromagnetic wave shielding casing, wherein the method is applied to a surface of the second shielding material. 16. The method according to claim 13, wherein the third shield member is a shield metal plate formed so as to correspond to the shape of the second shield member. A method of manufacturing an electromagnetic wave shielding casing. .