JP3523317B2 - Electromagnetic wave shielding material - Google Patents

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 used for building applications, for example.

[0002]

2. Description of the Related Art As an electromagnetic wave shield material for construction,
Generally, a 35 μm thick electrolytic copper foil is used, and electrical connection between each copper foil is secured by soldering or bending at the time of construction, but the copper foil is a very thin material. Since handling is troublesome such as cutting or punching holes, we have tried to improve handling by bonding or laminating sheets of paper or resin.

[0003]

In the above-mentioned conventional electromagnetic wave shielding material, it is difficult to uniformly apply the adhesive between the copper foil and the paper, and therefore wrinkles are likely to occur and the appearance Is not good enough, the paper-bonded product does not have enough strength, and the resin-laminated product is not easy to cut because it is not easy to cut. It is difficult to ensure uniform contact, electrical connection failure is likely to occur, and paper or resin laminated products are prone to burning.

[0004]

In order to solve the above-mentioned problems, the present invention comprises a glass fiber reinforcing material having a predetermined pattern interposed between a shield layer and a backing layer, and the predetermined pattern is not formed.
The mesh pitch depends on the frequency of the radio wave.
I changed it . A non-combustible material can be used as the backing layer, and the backing layer can be formed of high-density glass wool itself, or can be attached.

[0005]

Since the glass fiber reinforcing material having a predetermined pattern is interposed between the shield layer and the backing layer, the reinforcement is strengthened to prevent breakage, and the bending is facilitated. Depending on the pattern of the reinforcing material, it rises easily to make electrical contact, and the cutting process is much easier than that of resin laminate.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, FIG. 1 is a schematic sectional view of an electromagnetic wave shielding material according to the present invention, FIG. 2 is an enlarged plan view of FIG. 1, and FIG.
FIG. 6 is a sectional view of another embodiment.

This electromagnetic wave shield material adheres the shield layer 1 to the backing layer 3 via the adhesive layer 2, and also provides a predetermined pattern (here, a space between the shield 1 and the backing layer 3).
A glass yarn 4 which is a glass fiber reinforcing material having a lattice pattern) is interposed.

Although an electrolytic copper foil having a thickness of 35 μm is used as the shield layer 1, the shield layer 1 is not limited to this. For example, as the electrolytic copper foil, one having a thickness of 70 μm or more can be used, but one having a thickness of up to 135 μm is preferable as a limit of appearance of the pattern of the glass yarn 4 on the copper foil during production. In addition to the electrolytic copper foil, for example, the thickness is 20 μm to 10 μm.
A metal foil such as an electrolytic iron foil, an aluminum foil, and a stainless foil having a thickness of about 0 μm can also be used.

Although various adhesives can be used as the adhesive layer 2, it is preferable to use a flame-retardant or non-flammable one in order to make the electromagnetic shield material itself non-flammable. As the non-combustible adhesive, there is an adhesive mixed with phosphorus pentoxide.

Various materials can be used as the backing layer 3, for example, non-combustible paper which has been subjected to non-combustible treatment by mixing halogen or the like, wallpaper such as kraft paper used as an interior finishing material, glass paper (paper made of glass fiber). Mat) can be used, but it is preferable to use non-combustible paper or non-combustible material in order to make the electromagnetic shield material itself non-combustible.

The glass yarn 4 greatly improves the strength with respect to the structures of the backing layer 3 and the shield layer 1, and
As shown in FIG. 2, the glass yarn 4 is formed on the surface of the shield layer 1.
There is a function of forming a convex portion of a pattern corresponding to the pattern of (1) to facilitate electrical contact and prevent generation of wrinkles in the shield layer 1. The pattern shape of the glass yarn 4 can be a triangle, a rectangle, a waveform, etc. other than a square, and the pitch of the mesh is changed according to the frequency of the radio wave. For example, the pitch D is typically 1/2 inch (1
2.7 mm) or less, but UHF band (300 MHz)
In the above, the pitch is made finer.

In the electromagnetic wave shielding material configured as described above, the reinforcement is strengthened by the glass yarn 4,
With the backing layer 3, it becomes difficult to tear and is easy to bend, so that the electrolytic copper foil or the like forming the shield layer 4 can be easily handled, and the pattern of the glass yarn 4 appears on the surface of the shield layer 1. It makes it easier to make electrical contact, prevents electrical connection failure when stacked and laminated, and can use methods such as soldering similar to metal foil alone, cutting process is also significantly more than resin laminating It is easy and can be installed by using the general shield construction method.

Further, since the adhesive layer 2 and the backing layer 3 are made of nonflammable materials, all of them can be made of nonflammable material, so that the nonflammability of the electromagnetic wave shielding material itself can be increased.

Next, another embodiment shown in FIG. 3 is the backing layer 3
A high-density glass wool mat 5 having a thickness of about 25 mm is provided on the back surface of the above, and if it is used, it can be used as a shield duct. At that time, the length should be four times the opening length of the duct Thus, the shielding effect of the waveguide can be obtained, and it can be used as a heat insulating and shielding material. The backing layer 3 itself may be made of high density glass wool.

Here, the shield effect SE of the duct is expressed by the following (Equation 1), the cutoff frequency fc in the case of a square is the following (Equation 2), and the cutoff frequency fc in the case of a circular shape. Is expressed by the following (Equation 3).

[0016]

[Equation 1]

[0017]

[Equation 2]

[0018]

[Equation 3]

[0019]

As described above, according to the present invention,
Since the glass fiber reinforcing material having a predetermined pattern is interposed between the shield layer and the backing layer, the shield layer is reinforced so that damage is unlikely to occur, and bending and the like are facilitated to form a metal foil forming the shield layer. It becomes easy to handle, etc., the pattern of the glass fiber reinforcing material appears on the surface of the shield layer, and it is possible to prevent a poor electrical connection at the time of stacking and pasting, and it is possible to carry out the construction using a general shield construction method.

Further, by composing the backing layer with a non-combustible material, the non-combustibility of the electromagnetic wave shielding material can be improved, and by using the high density glass wool, both heat insulation and shielding effects can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an electromagnetic wave shield material according to the present invention.

FIG. 2 is an enlarged plan view of FIG.

FIG. 3 is a schematic sectional view of another embodiment.

[Explanation of symbols]

1 ... Seal layer, 2 ... Adhesive layer, 3 ... Backing layer, 4 ... Glass fiber reinforcement (glass yarn), 5 ... High density glass wool mat.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-62-40798 (JP, A) JP-A-59-84497 (JP, A) JP-A-59-98841 (JP, A) JP-A-4- 90326 (JP, A) Actual development 6-60198 (JP, U) Actual development 6-8526 (JP, U) Actual development 59-78696 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H05K 9/00 E04B 1/92 E04H 9/14

Claims (3)

(57) [Claims] 1. An electromagnetic wave shielding material comprising a backing layer and a shield layer bonded to the backing layer, wherein a glass fiber reinforcing material having a predetermined pattern is interposed between the shield layer and the backing layer, and the predetermined pattern is a mesh. Yes, of the mesh
Electromagnetic wave shield material whose pitch is changed according to the frequency of radio waves. 2. The electromagnetic wave shield material according to claim 1, wherein the backing layer is made of an incombustible material. 3. The electromagnetic wave shielding material according to claim 1 or 2, wherein the backing layer has a high density glass wool mat.