JPH11307975A - Electromagnetic shield case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the work of fixing an electromagnetic shield case body to a cover to eliminate factors of impairing the working environment by forming projective fitting on either the body or case and recessed fitting on the other. SOLUTION: An electromagnetic shield case 1 is composed of a case body 2 and cover 3 tightly fitted to the inside, a projective fitting 8 directed outside is machined on the side face of the cover 3, and a corresponding recessed fitting 7 is machined so as to fit the cover 3 to the inner side face of the case body 2. For a parallelpiped electromagnetic shield case 1, the recessed fitting 7 and projective fitting 8 are formed continuously around the whole on the four side faces each of the case body 2 and cover 3, respectively. The electromagnetic shield case can be easily made by drawing or press if using a metal, and the electromagnetic shield case having the same function using a conductive resin can be made by the injection molding etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic shielding case, and more particularly to a structure for fixing a case body and a lid of an electromagnetic shielding case in which electronic circuit components and the like are stored.

[0002]

2. Description of the Related Art In many cases, electronic circuit components used for EMI measures, such as noise filters, require electromagnetic shielding.
In many cases, electromagnetic shielding is performed by storing necessary electronic circuit components in a metal case.

FIGS. 9 and 10 are views showing a conventional electromagnetic shielding case made of metal. FIG. 9 shows an electromagnetic shielding case 1 having a structure in which the case main body 2 and the lid 3 are fitted together, soldered and fixed over the entire periphery of the fitted portion, and hermetically sealed.
9A is a sectional view, and FIG. 9B is a plan view. FIG. 10 is an explanatory view of the electromagnetic shielding case 1 having a structure in which the case main body 2 and the lid 3 are fitted together and the fitting portion is fixed by joining with a plurality of rivets 6.
10A is a sectional view, and FIG. 10B is a plan view. The electromagnetic shielding case 1 having these structures is provided with respective sealing means after storing articles therein.

[0004]

However, when the case main body and the lid are fixed by soldering to form an electromagnetic shielding case, the temperature rise due to soldering extends to the inside of the electromagnetic shielding case and is stored. There are problems such as causing breakage and deterioration of the electronic circuit and the like. In addition, when soldering, sufficient measures must be taken from the working environment to protect the worker from the vapor of solder, so that there is a problem that the cost of the measures becomes high.

Further, when the case body and the lid are fixed by rivet bonding, not only a special jig is required, but also a measure for countermeasures against impact noise at the time of rivet bonding is required.

Accordingly, the present invention solves these problems, that is, there is no factor that causes an increase in the internal temperature and a deterioration of the working environment due to the fixing work of the case body and the lid, and the case body and the lid can be easily fixed. An object is to provide an electromagnetic shielding case having a structure.

[0007]

According to the present invention, there is provided an electromagnetic shielding case in which a case main body and a lid are fitted to each other to electromagnetically shield an internal space. This is an electromagnetic shielding case in which a part and a concave fitting part are formed on the other side.

Further, the present invention is the above electromagnetic shielding case, wherein the convex fitting portion and the concave fitting portion are formed continuously with the fitting portion of the case body and the lid.

Further, according to the present invention, the convex fitting portion and the concave fitting portion may be formed such that the fitting portion between the case body and the lid is
It is the above-mentioned electromagnetic shielding case formed intermittently at a place or a plurality of places.

Further, the present invention is the above-mentioned electromagnetic shielding case, wherein a sealing material for keeping the internal space airtight is arranged at a fitting portion between the case body and the lid.

Further, the present invention provides an electromagnetic shielding case in which a case body and a lid are fitted to each other and electromagnetically shields an internal space. This is an electromagnetic shielding case having a mating portion and a punched hole formed in the other fitting portion corresponding to the convex fitting portion.

Further, the present invention is a noise filter using the electromagnetic shielding case.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a sectional view for explaining an electromagnetic shielding case according to an embodiment of the present invention. In FIG. 1, an electromagnetic shielding case 1 includes a case main body 2.
And a lid 3 fitted and fixed inside. A convex fitting portion 8 is formed on the side surface of the lid 3 toward the outside. A concave fitting portion 7 is machined and formed on the corresponding inner side surface of the case body 2 so that the lid 3 is fitted. If the material of the electromagnetic shielding case is a metal plate, it can be easily formed into these convex and concave shapes by drawing or pressing.

FIGS. 2 and 3 are exploded perspective views of the electromagnetic shielding case according to the embodiment of the present invention. In the case of the rectangular electromagnetic shielding case 1 shown in FIG.
The concave fitting portion 7 and the convex fitting portion 8
It is formed continuously on the side surface, that is, over the entire circumference.

On the other hand, in the case of the electromagnetic shielding case 1 shown in FIG. 3, the case body 2 and the lid 3 respectively have a concave fitting portion 7 and a convex fitting portion 8 which are processed into a concave shape and a convex shape.
Are formed at two places on each of four sides of the rectangular electromagnetic shielding case 1.

(Embodiment 2) FIGS. 4 and 5 are explanatory views of an electromagnetic shielding case according to another embodiment of the present invention. FIG. 4 is a cross-sectional view of the electromagnetic shielding case 1 in which the square packing 11 is arranged in the case main body 2 to achieve airtightness of the internal space. FIG. 5 is a cross-sectional view of the electromagnetic shielding case 1 in which an O-ring 12 is arranged on a side surface of the lid 3 to achieve airtightness.

In FIGS. 4 and 5, the convex fitting portion 8 on the side surface of the lid 3 is formed into a convex outward shape, and the lid 3 is fitted on the corresponding inner side surface of the case body 2. A concave fitting portion 7 is formed so as to fit. Further, packing such as silicone rubber is arranged on the case body 2 over the entire circumference.

In the case of the structure shown in FIG. 4, when the case body 2 and the lid 3 are fitted together, the entire periphery of the end of the lid 3 is a square packing 1.
1 and deforms the square packing 11, so that the inside of the electromagnetic shielding case 1 is airtight.

In the case of the structure shown in FIG. 5, when the lid 3 is inserted into the case body 2 and fitted, the O-ring 12 comes into contact with the inner wall of the case body 2 and is deformed. The airtightness of the inside is achieved.

Also, in the second embodiment, similarly to the first embodiment, the fitting portion may be formed continuously over the entire circumference, or may be formed at one location or at a plurality of locations intermittently. You may.

(Embodiment 3) FIGS. 6, 7 and 8
FIG. 11 is an enlarged sectional view of a fitting portion of an electromagnetic shielding case according to still another embodiment of the present invention. FIG. 6 is a diagram in which a metal lump 9 is fixed to the side surface of the lid 3. Lump 9 is the case body 2
Is fixed by brazing or the like. The side surface of the case body 2 is the same as that of the first embodiment so that the lump 9 is fitted.
May be the same as the structure shown in FIG.

FIG. 7 is a view showing an example in which the side face of the lid 3 which is intermittently processed into a convex shape and the corresponding portion of the side face of the case body 2 are cut out to form a hole 14. is there.

FIG. 8 also shows a cut of the corresponding side surface of the case body 2 on the side surface of the lid 3 which has been formed into an intermittently convex shape, leaving a cut piece 15 on the side surface. It is a figure showing the example of crevice formation. The elasticity of the notch pieces 15 left on the side surface of the case body 2 facilitates the fitting operation.

When using a metal, the electromagnetic shielding case can be easily manufactured by drawing or pressing. An electromagnetic shielding case using a conductive resin and having the same function can also be made by means such as injection molding.

Further, in each of the above-described embodiments, the description is limited to the structure in which the lid is located inside the main body case and is fitted thereto. The idea is the same.

[0027]

As described above, according to the present invention, there is no factor that causes an increase in the internal temperature and a deterioration of the working environment due to the fixing operation of the case body and the lid, and the fixing of the case body and the lid is easy. An electromagnetic shielding case that can be manufactured is obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a sectional view and an enlarged view of a partial section of an electromagnetic shielding case according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the electromagnetic shielding case according to the embodiment of the present invention.

FIG. 3 is an exploded perspective view of the electromagnetic shielding case according to the embodiment of the present invention.

FIG. 4 is a cross-sectional view of an electromagnetic shielding case in which a square packing is arranged on a case body according to another embodiment of the present invention to achieve airtightness.

FIG. 5 is a cross-sectional view of an electromagnetic shielding case in which an O-ring is arranged on a side surface of a lid according to another embodiment of the present invention to achieve airtightness.

FIG. 6 is an enlarged sectional view of a fitting portion of an electromagnetic shielding case in which a metal lump is fixed to a side surface of a lid according to still another embodiment of the present invention.

FIG. 7 is an enlarged cross-sectional view showing an example in which a side surface of a lid that is intermittently processed into a convex shape and a corresponding portion of a side surface of a case body are cut out to form a hole.

FIG. 8 cuts a side portion of the case body corresponding to the side of the lid which is intermittently processed into a convex shape,
FIG. 5 is an enlarged cross-sectional view showing an example of forming a concave portion with a cut piece left on a side surface.

FIG. 9 shows a conventional electromagnetic shielding case made of metal, in which a case main body and a lid are fitted together, soldered and fixed over the entire periphery of the fitted portion, and hermetically sealed. FIG. 9A is a sectional view, and FIG. 9B is a plan view.

FIG. 10 is an explanatory view of a conventionally employed metal electromagnetic shielding case having a structure in which a case body and a lid are fitted to each other and the fitting portion is fixed by rivet bonding at a plurality of locations. FIG. 10A is a sectional view, and FIG. 10B is a plan view.

[Description of Signs] 1 Electromagnetic shielding case 2 Case main body 3 Lid 5 Solder 6 Rivet 7 Concave fitting part 8 Convex fitting part 9 Lump 11 Square packing 12 O-ring 14 Drilled hole 15 Cut piece

Claims (6)

[Claims] In an electromagnetic shielding case in which a case body and a lid are fitted to each other to electromagnetically shield an internal space, a convex fitting portion is fitted to one of the case body and the lid, and a concave fitting portion is fitted to the other. An electromagnetic shielding case characterized by forming a joint. 2. The convex fitting portion and the concave fitting portion,
The electromagnetic shielding case according to claim 1, wherein the electromagnetic shielding case is formed continuously with a fitting portion between the case body and the lid. 3. The convex fitting portion and the concave fitting portion,
The electromagnetic shielding case according to claim 1, wherein the electromagnetic wave shielding case is formed so as to be intermittently formed at one or a plurality of places in a fitting portion between the case body and the lid. 4. The electromagnetic device according to claim 1, wherein a seal member for keeping the internal space airtight is disposed at a fitting portion between the case body and the lid. Shielding case. 5. An electromagnetic shielding case in which a case main body and a lid are fitted to each other to electromagnetically shield an internal space, wherein one of the fitting portions of the case main body and the lid is formed as a convex fitting portion. An electromagnetic shielding case, wherein a punched hole is formed in the other fitting portion corresponding to the convex fitting portion. 6. A noise filter using the electromagnetic shielding case according to claim 1.