JPH0897585A - Electromagnetic shielding material - Google Patents

Abstract

PURPOSE: To provide an electromagnetic shielding material which does not injure workers and, at the same time, the electromagnetic shielding ability of which is not deteriorated. CONSTITUTION: An electromagnetic shielding material 1 is composed of a spring material 2 and protective material 6. The spring material 2 is obtained by pressing a stainless steel sheet and is provided with a base section 4 having a low-level part 4a and finger 5 having a pressed part 5b. The protective material 6 is formed by injecting an elastomer and protects the edges of the high- level part of the base section 4 and the finger 5. Therefore, the hand or finger of a worker is not injured when he fixes the shielding material l to an enclosure, because he does not touch directly the edge of the metal. In addition, since the protective material 6 is formed higher than the low-level part 4a and lower than the pressed part 5b, the contact between the part 4a and a first conductor and the contact between the pressed part 5b and second conductor are not hindered. Therefore, the electromagnetic wave shielding ability of the material 1 is not deteriorated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic wave shield material which is disposed in a gap between a first conductor and a second conductor and which abuts both conductors and prevents electromagnetic waves from passing through the gap.

[0002]

2. Description of the Related Art Conventionally, for example, actual Kaihei 2-124949
As disclosed in No. 3, there is known an electromagnetic wave shielding material including a flat plate-shaped base portion and a plurality of spring portions (fingers) formed by folding back from a side edge of the base portion to above the base portion. It was Further, as disclosed in Japanese Utility Model Laid-Open No. 3-69294, there is known an electromagnetic wave shielding material including a semi-circular spring portion and a base portion formed by folding back from both edges of the spring portion. Was there.

Such an electromagnetic wave shielding material is used, for example, as a fin gas trip in an opening / closing part or a door part of a computer device, a communication device, a measuring device, a shield room, etc., and electromagnetic waves pass through a gap in the opening / closing part. Can be prevented. That is, by fixing the base portion to one side of the opening / closing portion and pressing the other side of the opening / closing portion against the spring portion, the gap of the opening / closing portion is filled with the conductive material, which prevents the passage of electromagnetic waves. You can do it.

[0004]

However, since the above-mentioned electromagnetic wave shielding material is formed of a thin metal plate and the edges forming the outer periphery of the base portion and the spring portion are exposed, the electromagnetic wave shielding material is exposed. There was a case that the hand or finger of the worker who installed it on the etc. was injured.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an electromagnetic wave shield material that does not damage an operator and does not impair the electromagnetic wave shield ability.

[0006]

In order to solve the above-mentioned problems, the invention according to claim 1 is arranged in a gap between a first conductor and a second conductor, and contacts both conductors so that electromagnetic waves are generated. In an electromagnetic wave shielding material for preventing passage through a gap, a base portion having a fixing surface fixed to the first conductor, and
A conductive spring member having a spring portion having a pressed surface that is pressed by the second conductor and biases the second conductor; and a spring member protruding from the edge of the spring portion of the spring member and covered by the spring member. The protective material is formed so as to be recessed inward from the pressing surface.

According to a second aspect of the invention, there is provided the electromagnetic wave shielding material according to the first aspect, wherein the spring material covers the flat base portion and one side edge of the base portion and covers the upper portion of the base portion. It is characterized in that it comprises a spring portion composed of a plurality of bent fingers, and the protective material is formed so as to protrude from at least an edge of a side other than the tip side among the edges of the finger.

A third aspect of the present invention is the electromagnetic wave shielding material according to the first or second aspect, wherein the protective material protrudes from the edge of the base portion of the spring material and extends inward from the fixing surface of the base portion. It is characterized by being formed by being submerged.
The invention according to claim 4 is the electromagnetic wave shielding material according to any one of claims 1 to 3, wherein the protective material is made of a conductive material.

[0009]

According to the electromagnetic wave shield material of the first aspect, the protective material is provided on the edge of the spring portion of the conductive spring material so as to protrude from this edge. Usually, the operator often holds the spring portion when holding the electromagnetic wave shielding material, so that the operator's hand or finger comes into contact with the protective material and does not directly contact the edge. Therefore, the operator does not have a risk of injuring a hand or a finger by the edge. Further, since the protective material is formed so as to be recessed inward of the electromagnetic wave shield material with respect to the pressed surface of the spring portion, the protective material does not hinder the contact between the second conductor and the pressed surface, The provision of the protective material does not reduce the electromagnetic wave shielding ability. Here, as described in claim 2, the spring portion of the spring material may be formed of a plurality of fingers, and the protective material may be formed by protruding from the edge of at least the tip side of the edges of the finger. . Of the edges of the fingers, the edge at the tip end has a small chance of coming into contact with the hand or finger of the operator, and therefore the effect of the present invention is not impaired even if a protective material is not particularly provided at this portion.

According to the third aspect of the present invention, since the protective member is further provided so as to protrude from the edge of the base portion of the spring member, the operator is less likely to injure the hand or finger by the edge. Further, since the protective material is formed so as to be submerged inward of the electromagnetic wave shielding material rather than the fixed surface of the base portion, the protective material does not interfere with the contact between the first conductor and the fixed surface, and thus the protective material is protected. The provision of the electromagnetic wave shield does not reduce the electromagnetic wave shielding ability.

According to the fourth aspect of the present invention, since the protective material is made of a conductive material, even if the protective material and the first or second conductor come into contact with each other, conduction can be achieved, and the electromagnetic wave shielding ability can be more reliably achieved. Can be maintained.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. 1 and 2 are explanatory views of the electromagnetic wave shielding material of the first embodiment, FIG. 1 (a) is a plan view, and FIG.
1B is a front view, FIG. 1C is a left side view, FIG. 1D is a bottom view, FIG. 1E is a rear view, and FIG.
FIG. 2B is a cross-sectional view taken along the line A-A in FIG. 1B, and FIG.
It is B sectional drawing.

The electromagnetic wave shield material 1 of the first embodiment comprises a spring material 2 and a protective material 6. The spring member 2 is integrally formed by pressing a single thin plate of stainless steel, and has a rectangular base 4 having fixing holes 3 and one side edge of the base 4. 4 is provided with a plurality of fingers 5 bent so as to cover the upper side.
Further, as shown in FIG. 1A, the finger 5 is not provided above the fixing hole 3 provided in the base portion 4, and therefore the fixing hole 3 is completely exposed without being covered by the finger 5. There is.

As shown in FIG. 2 (a), the base portion 4 has a low step portion 4a as a fixing surface and a high step portion 4b formed to be one step higher than the low step portion 4a. There is. The side edge of the high step portion 4b is bent and connected to the finger 5. As shown in FIG. 2A, the finger 5 has a low step portion 5a connected to a side edge of the high step portion 4b of the base 4, a pressed portion 5b which is one step higher than the low step portion 5a, and It has a tip low step portion 5c formed at the tip of the pressing portion 5b to be one step lower than the pressed portion 5b. Further, as shown in FIG. 2B, the finger 5 has side end low step portions 5d formed on both sides of the pressed portion 5b so as to be one step lower than the pressed portion 5b.

The protective material 6 is formed by injection molding or press molding of an elastomer, and includes a base protection portion 7 and a finger protection portion 8 formed by bending a side edge of the base protection portion 7. have. Here, as the elastomer, olefin elastomer, silicone, natural rubber, synthetic rubber (CR, EPDM, NBR, S
(BR, IR, etc.), and other general plastics such as nylon, PP, PE may be used. In addition to solid, sponge may be used.

The base protector 7 is for mounting the high step portion 4b of the base 4 of the spring member 2 and covering the edge of the high step portion 4b to protect the finger of the operator. here,
The base protection portion 7 is formed so as to be recessed inward of the electromagnetic wave shielding material 1 with respect to the lower step portion 4 a of the base 4. That is, the base protection part 7 is formed one step higher than the low step part 4 a of the base 4.

The finger protection section 8 covers the edge of the finger 5 to protect the finger of the operator. The finger protection portion 8 is provided with a square hole 9, and among the sides forming the square hole 9, the upper side, the left side, and the right side have grooves 9a,
9b and 9c are provided. Then, the low-step portion 5a of the finger 5 is arranged on the inner surface side of the finger protection portion 8 of the protective member 6, and the tip low-step portion 5c of the finger 5 is inserted into the groove 9a provided on the upper side to lower the side end of the finger 5. The step portion 5d is inserted into the grooves 9b and 9c provided on the left and right sides, respectively. As a result, the finger protection portion 8 covers the outer peripheral edge of the finger 5. Further, the finger protection portion 8 is arranged so as to be recessed inward of the electromagnetic wave shielding material 1 with respect to the pressed portion 5b of the finger 5. That is, the pressed portion 5b of the finger 5 is arranged one step higher than the finger protection portion 8 of the protection member 6.

Next, the operation of the first embodiment will be described with reference to FIG. FIG. 3 is a diagram illustrating the use of the electromagnetic wave shielding material of the first embodiment. Here, a case where the electromagnetic wave shielding material 1 is arranged in the gap between the casing 91 and the lid 92 of the computer device will be described as an example. The housing 91 and the lid 92 are each formed of a conductive material.

First, the electromagnetic wave shielding material 1 is fixed to the housing 91 of the computer device. That is, the electromagnetic wave shield material 1
A screw (not shown) is inserted into the fixing hole 3 formed in the above, and is fixed around the opening of the casing 91 of the computer device by this screw. At this time, since the finger 5 does not exist above the fixing hole 3, it is possible to easily insert the screw and fix the screw. When gripping the electromagnetic wave shielding material 1, the worker who performs the fixing work does not have a risk of injuring the hand or the finger with the edge because the hand or the finger does not come into direct contact with the edge of the metal and the protective material 6. Further, since the low-step portion 4a of the base portion 4 is one step lower than the base-portion protecting portion 7 of the protective member 6, the low-step portion 4a of the base portion 4 and the housing 91 of the computer device are in close contact with each other. That is, the protective material 6 does not prevent the contact between the two.

Next, the lid 92 of the computer device is fitted into the opening of the housing 91. When the lid 92 is fitted in the opening, the pressed portion 5b of the finger 5 of the electromagnetic wave shielding material 1 is closed by the lid 9
It is pressed by 2. At this time, since the pressed portion 5b is one step higher than the finger protection portion 8 of the protective member 6, the pressed portion 5b and the lid 92 of the computer device are brought into sufficient close contact with each other. That is, the protective material 6 does not prevent the contact between the two.

After that, the lid 92 is attached to the housing 91 with screws 93.
Fixed to. As a result, it is possible to prevent electromagnetic waves generated in the computer device from passing through the gap between the lid 92 and the housing 91 and leaking to the outside. As described above, according to the electromagnetic wave shielding material 1 of the first embodiment, it is possible to obtain the effect that the worker does not have a risk of injuring a hand or a finger with a metal edge.

Further, even if the protective material 6 is present, the contact between the lower step portion 4a of the base 4 and the housing 91 of the computer device and the contact between the pressed portion 5b of the finger 5 and the lid 92 are not hindered. Therefore, the effect that the electromagnetic wave shielding ability does not decrease due to the presence of the protective material 6 is obtained.

Further, since the protection member 6 is an elastomer which is an elastic material, it does not reduce the biasing force of the fingers 5 but rather assists the biasing force. For this reason, it is possible to maintain the contact between the lower step portion 4a of the base 4 and the housing 91 of the computer device and the contact between the pressed portion 5b of the finger 5 and the lid 92 of the computer device more closely. . This effect is obtained when the protective member 6 is provided from the base 4 of the spring member 2 to the fingers 5.

Next, the electromagnetic wave shield material of the second embodiment will be described. 4A and 4B are explanatory views of the electromagnetic wave shielding material of the second embodiment. FIG. 4A is a perspective view, FIG. 4B is a developed view, and FIG. 4C is CC of FIG. 4B. FIG. The electromagnetic wave shield material 21 of the second embodiment is composed of a spring material 22 and a protective material 26.

The spring member 22 is integrally formed by pressing a single thin plate of stainless steel, and covers the flat base portion 24 and one side edge of the base portion 24 so as to cover the base portion from above. A plurality of fingers bent in two
5 is provided. A step 23 is provided on the end surface side of the base portion 24 so as to be recessed inward of the electromagnetic wave shield material 21, and a portion other than this step serves as a fixed surface 24a. On the other hand, also on the outer periphery of the finger 25, that is, the edge, the electromagnetic wave shielding material 2
A step 23 is provided so as to be depressed inward of 1, and a portion other than this step 23 becomes a pressed surface 25a.

The protective material 26, as shown in FIG.
The stepped portion 23 provided on the edge of the finger 25 is formed so that the elastomer protrudes from the edge. The protective material 26 formed in this way is fixed to the fixed surface 24 a of the base 24.
Also, the finger 25 is formed so as to be recessed inward from the pressed surface 25a of the finger 25 in the electromagnetic wave shielding material 21. That is, the protective member 26 is formed to be higher than the fixed surface 24a of the base 24 and lower than the pressed surface 25a.

The electromagnetic wave shield material 21 of the second embodiment can be manufactured, for example, as follows. That is, a slit 27 is formed by pressing the stainless steel thin plate 20 and a step 23 is provided at the edge of the finger 25, and the step 23 is coated with an elastomer coating agent and dried to form a protective material 26. As shown in FIG. 4 (b), it can be manufactured by expanding it and then bending it. Here, as the coating agent, silicon, acrylic, urethane, polyester, nylon, or the like can be used.

The function of the electromagnetic wave shield material 21 of the second embodiment is that it is fixed by attaching the fixing surface 24a of the base portion 24 with double-sided tape around the opening of the casing 91 (see FIG. 3) of the computer device. Since it is the same as that of the first embodiment, the description thereof will be omitted. The effects of the second embodiment are similar to those of the first embodiment.

Next, a third embodiment will be described. Figure 5
5 is an explanatory view of the electromagnetic wave shielding material of the third embodiment, and FIG.
5A is a perspective view, FIG. 5B is a development view, and FIG. 5C is a D view of FIG. 5B. The electromagnetic wave shield material 31 of the third embodiment is composed of a spring material 32 and a protective material 36.

The spring material 32 is integrally formed by pressing a single thin plate of stainless steel, and has a plurality of semicircular spring portions 35 partitioned by slits 37, and the spring portions 35. It is provided with a flat plate-shaped base portion 34 that is bent inward from both side edges.

An elastomer protective material 36 is attached to the inner surfaces of the spring portion 35 and the base portion 34. The protective material 36 is formed on the inner surface of the slit 37 of the spring material 32 as shown in FIGS. 5 (b) and 5 (c). It is formed so as to cover the side and protrude from the end surface of the spring material 32. The electromagnetic wave shield material 31 of the third embodiment can be manufactured, for example, as follows. A slit 37 is formed by pressing a thin plate 30 of stainless steel,
Further, a protective material 36 made of an elastomer, which is slightly larger than the thin plate 30, is attached to one surface to bring it into a developed state as shown in FIG.
It can be manufactured.

The operation of the electromagnetic wave shielding material 31 of the third embodiment is the same as the electromagnetic wave shielding material 31 except that one of the base portions 34 is fixed by a double-sided tape around the opening of the casing 91 (see FIG. 3) of the computer. Since it is the same as that of the first embodiment, the description thereof will be omitted. The effects of the third embodiment are similar to those of the first embodiment.

As a modification of the third embodiment, as shown in FIG. 6, a spring material 32 similar to that of the third embodiment is used, and the spring material 3 is used.
Protective material 38 that covers only the inner surface side of the spring portion 35 of 2, the mounting plate 39 disposed on the inner surface side of the base portions 34, 34, the mounting plate 3
Rivet 51 inserted in the mounting hole 39a formed in 9
You may comprise by. Although not shown, the protective member 38 is protruded from the end face of the spring portion 35 as in the third embodiment, but is not provided on the base portion 34.

The operation of this modification is the same as that of the first embodiment except that it is fixed to the casing 91 (see FIG. 3) of the computer device by the rivet 51, and therefore its explanation is omitted. The effects of this modification are similar to those of the first embodiment. Next, a fourth embodiment will be described. FIG. 7 is a perspective view of the electromagnetic wave shield material of the fourth embodiment.

The electromagnetic wave shield material 41 of the fourth embodiment comprises a spring material 42 and a protective material 46. Spring material 42
Is integrally formed by pressing a single thin plate of stainless steel, and has a flat base portion 44,
A plurality of fingers 45 that are bent so as to cover the base 44 from above one side edge of the base 44 are provided.

A protective member 46 made of an elastomer is attached to the inner surface side of the spring member 42. The protective member 46 is formed so as to cover the inner surface side of the slit 47 of the spring member 42 and protrude from the end surface of the spring member 42. There is. The portion of the protective material 46 that covers the slit 47 is not cut and is in a connected state, and the portion shown by the chain double-dashed line in FIG. 7 may be cut by a cutter, scissors, or the like as needed during use. You can When cut and used in this way, each finger 45
Since the degree of freedom of is increased, it is possible to cope with a case where the surface pressing the finger 45 is curved. On the other hand, for example, if the surface pressing the finger 45 is a flat surface, it may be used in a connected state.

The protective member 46 thus formed is formed lower than the finger 45 so as to be recessed inward of the electromagnetic wave shielding member 41, and is also formed higher than the base portion 44. The function of the electromagnetic wave shielding material 41 of the fourth embodiment is the same as that of the first embodiment except that the base portion 44 is fixed by sticking a double-sided tape around the opening of the housing 91 (see FIG. 3) of the computer apparatus. Since it is the same, the description is omitted. The effects of the fourth embodiment are similar to those of the first embodiment. A sponge may be used as the protective material 46 instead of the elastomer. In this case, the slit 47 is used.
Even if the protective material 46 of the part is connected, a sufficient degree of freedom can be obtained, so that it is not particularly necessary to cut.

Needless to say, the present invention is not limited to the above-mentioned embodiments and can be carried out in various modes without departing from the technical scope of the present invention. For example, in each of the above-described embodiments, an operator usually grips the edge of the spring portion (finger) to perform the work, and therefore a protective material is provided only on the edge of the spring portion (finger) so that the protective material covers the spring portion. It may be configured so as to be recessed inward from the pressing surface, and in this case as well, it is possible to obtain the effects of protecting the operator's hands and fingers and not reducing the electromagnetic wave shielding ability. At this time, when the spring portion is composed of a plurality of fingers as in the first, second and fourth embodiments, the protective material may be provided only on the edges of the fingers other than the leading edge. Good. Since there is little chance that the edge at the tip of the finger comes into contact with the operator's hand or finger, the effect of the present invention is not impaired even if a protective material is not particularly provided at this portion.

Further, for example, a rib of a ridge may be provided on the pressed portion 5b of the finger 5 of the first embodiment and this rib may be used as the pressed surface. In this case, since the step between the rib and the protective member 6 is further increased, the finger 5 is more closely attached and fixed to the lid 92 of the computer device, so that the electromagnetic wave shielding ability can be more reliably exhibited.

Further, a conductive material may be used as the protective material. In this case, for example, in the first embodiment, the protective material 6
Even if the protective member 6 and the lid 92 of the computer device come into contact with each other due to an insufficient step between the pressed portion 5b of the finger 5 and the finger 5, the electromagnetic wave shielding ability can be maintained because the two can conduct electricity. Here, as the conductive material, for example, a thermoplastic synthetic fiber and a conductive fiber to form a paper-like material by mixing papermaking, from a thermoplastic resin matrix formed into a film by heat-sealing this with, for example, a heating roll. And a conductive film such as a stainless steel fiber, a carbon fiber, or a conductively processed organic fiber (for example, a fiber obtained by diffusing copper ions in an acrylic fiber in a dyeing step).

Further, as the material of the protective material, other than the elastomer, any material such as paper, foam material, cloth, plastic film, sponge or the like which is not likely to damage the operator's hand or finger can be used. On the other hand, as the material of the spring material, in addition to stainless steel, beryllium copper, phosphor bronze, or a thin metal plate having a spring property can be used. Also, a material having a low spring property such as aluminum foil may be used, but in this case, by forming a protective material using an elastic material and providing the protective material from the base portion of the spring material to the spring portion, the elasticity of the aluminum foil is reduced. Is preferably assisted by the elastic force of the protective material.

In addition, the spring material and the protective material of the electromagnetic wave shield material may be removable.

[Brief description of drawings]

1A and 1B are explanatory views of an electromagnetic wave shielding material of a first embodiment, FIG. 1A is a plan view, FIG. 1B is a front view, and FIG.
1C is a left side view, FIG. 1D is a bottom view, and FIG. 1E is a rear view.

FIG. 2 is an explanatory view of an electromagnetic wave shielding material of the first embodiment, FIG. 2 (a) is a sectional view taken along line AA of FIG. 1 (b), and FIG.
(B) is a BB sectional view of FIG. 1 (c).

FIG. 3 is a diagram illustrating the use of the electromagnetic wave shielding material of the first embodiment.

4A and 4B are explanatory views of an electromagnetic wave shielding material of a second embodiment, FIG. 4A is a perspective view, FIG. 4B is a developed view, and FIG.
FIG. 4C is a sectional view taken along line CC of FIG.

5A and 5B are explanatory views of an electromagnetic wave shielding material of a third embodiment, FIG. 5A is a perspective view, FIG. 5B is a developed view, and FIG.
(C) is a D view of FIG. 5 (b).

FIG. 6 is a cross-sectional view of a modified example of the third embodiment.

FIG. 7 is a perspective view of an electromagnetic wave shield material of a fourth embodiment.

[Explanation of Codes] 1 ... Electromagnetic wave shield material, 2 ... Spring material, 3 ... Fixing hole, 4 ...
..Base portions, 4a ... low-stage portions,
4b ... higher steps, 5 ... fingers,
5a ... Low step part, 5b ... Pressed part, 6 ... Protective material, 7 ... Base protection part, 8 ... Finger protection part, 9 ... Square hole,

Claims (4)

[Claims] 1. An electromagnetic wave shield material which is disposed in a gap between a first conductor and a second conductor and which abuts both conductors and prevents electromagnetic waves from passing through the gap. A conductive spring member having a base portion having a fixed surface to be fixed, and a spring portion having a pressed surface that is pressed by the second conductor and biases the second conductor, and a spring of the spring member. An electromagnetic wave shield material, comprising: a protective material that protrudes from an edge of the spring portion and is recessed inward from a pressed surface of the spring portion. 2. The spring member includes a flat plate-shaped base portion, and a spring portion including a plurality of fingers that are bent so as to cover one side edge of the base portion and an upper portion of the base portion. The electromagnetic wave shielding material according to claim 1, wherein the electromagnetic wave shielding material is formed so as to protrude from at least an edge of a side of the finger other than a side of the tip. 3. The protective material is further formed so as to protrude from an edge of a base portion of the spring material and to be recessed inward from a fixing surface of the base portion.
The electromagnetic wave shielding material described. 4. The electromagnetic wave shield material according to claim 1, wherein the protective material is made of a conductive material.