JP6616982B2 - Electromagnetic shield structure in shielded section through waveguide, cable installation method to shielded section through waveguide - Google Patents

Description

  The present invention relates to an electromagnetic shield structure in a shield section through waveguide and a cable construction method for the shield section through waveguide.

  2. Description of the Related Art In recent years, radio waves have been widely used in various devices such as mobile phone terminals and various wireless communications such as various Wi-Fi (Wireless Fidelity) and wireless LAN (Local Area Network). For this reason, in order to prevent malfunctions in the equipment used due to the influence of these radio waves, various studios including broadcasting, control rooms, MRI (magnetic resonance imaging) examination rooms, laboratories For example, a shield section having an electromagnetic shield structure on the wall, floor, ceiling, etc. is formed to suppress the invasion of radio waves from the outside.

  In a shield section in which walls, floors, ceilings, and the like have an electromagnetic shield structure, cables for communication, power supply, and the like need to penetrate inside and outside the shield section. For this reason, a metal pipe is provided so as to penetrate the shield section, and a cable is inserted through the pipe. In addition to this, pipes that penetrate the inside and outside of the shield section may be provided for water supply, drainage, ventilation, air conditioning, and the like.

In the case of providing a waveguide such as a cable pipe or pipe that penetrates the shield section, it is necessary to prevent radio waves from entering from the outside through the waveguide.
In view of this, the diameter of the waveguide is set to be ½ or less of the wavelength λ of the radio wave at the upper limit of the frequency range of the radio wave to be shielded (this is referred to as the upper limit frequency).

  Patent Document 1 discloses a configuration in which an insulating magnetic material such as ferrite is provided on the outer periphery of an insulating portion of a cable that penetrates through portions inside and outside the shield section.

  Patent Document 2 discloses a configuration in which an electromagnetic wave absorber including a polymer, rubber, and a magnetic material such as ferrite is filled in a through hole that penetrates a cable to ensure a shielding effect in the waveguide.

JP 2003-60379 A JP 2008-98458 A

However, when a large number of electronic devices such as a studio are used, thousands of cables may be drawn into the shield section. In such a case, as in the configuration disclosed in Patent Document 1, it takes much time and cost to provide an insulating magnetic body in each cable.
Moreover, even if the electromagnetic wave absorber is filled in the through-hole of the waveguide as in the configuration disclosed in Patent Document 2, labor and cost are increased.
Furthermore, in order to draw a large number of cables into the shield section, it is necessary to provide a large number of waveguides, and installation of the large number of waveguides also takes time and cost.

  Moreover, in a typical mobile phone as a radio wave to be shielded, the radio wave to be used has a higher frequency. For this reason, the upper limit frequency of the radio wave to be shielded tends to increase. Accordingly, in order to obtain the electromagnetic shielding effect, the tube diameter of the waveguide is reduced when the tube diameter is set to ½ or less of the wavelength λ in the radio wave having the upper limit frequency. Thus, as the waveguide becomes thinner, the number of cables that can be inserted into one waveguide is reduced. For this reason, in order to insert a predetermined number of cables, it is necessary to increase the number of waveguides, and the various problems described above become even more remarkable.

  An object of the present invention made there is to penetrate the shield section, which allows easy installation of the waveguide into the shield section, insertion of the cable into the waveguide, and reliable acquisition of the required shield performance. An electromagnetic shield structure in a waveguide, and a cable construction method for a shield section through waveguide.

The present invention employs the following means in order to solve the above problems.
That is, the present invention penetrates through a shield partition having electromagnetic shielding properties, a waveguide formed from a conductive material, and a plurality of sheets are laminated in the waveguide formed from a conductive material, Between the plate body having a plurality of concave grooves continuous in the axial direction of the waveguide and the plate bodies positioned above and below each other in the waveguide, the concave groove formed on the lower plate body and the upper side And a cylindrical portion having an inner shape dimension of ½ or less of the wavelength of the radio wave at the upper limit frequency to be shielded.
According to such a configuration, a large number of cylindrical portions having electromagnetic shielding properties can be easily formed by laminating a plurality of plate bodies in which a plurality of concave grooves are formed in the waveguide. Therefore, it is not necessary to install a large number of waveguides.
Moreover, if the cable is inserted into such a cylindrical portion, the electromagnetic shielding property in the shield partition can be easily ensured.
Furthermore, when the cable is inserted, after the cable is received from above in the concave groove of the plate arranged in the waveguide, another plate can be laminated on this plate, so that the insertion of the cable Work can also be done easily.

  Moreover, you may make it further provide the shield gasket which consists of an electroconductive material and has the cushioning property pinched | interposed into the part which the said board bodies located up and down mutually collide. Thereby, the electromagnetic shielding property between plate bodies located up and down mutually is securable.

  The plate may be a construction steel plate having a corrugated cross section. Thereby, a board can be obtained cheaply.

The waveguide may include a waveguide body having a U-shaped cross section and opening upward, and a lid that covers the top of the waveguide body.
As a result, if the lid is attached to the waveguide body after performing operations such as laminating the plates and accommodating the cable in the concave groove with the lid open, the operation can be performed efficiently. it can.

The present invention also includes a step of accommodating a cable in the concave groove of a plate body disposed in a cylindrical waveguide penetrating the shield section and having a concave groove on the upper surface; And a step of laminating the plate members, and a cable construction method for a shielded section penetrating waveguide.
As described above, after the cable is accommodated in the groove of the plate disposed in the waveguide, another plate is stacked on the plate, and the cable is accommodated in the groove of the stacked other plate. By doing so, the cable can be easily inserted into the waveguide.

  According to the present invention, it is possible to easily install the waveguide in the shield section and to insert the cable into the waveguide, and to obtain the required shielding performance with certainty.

It is a plane sectional view showing the electromagnetic shielding structure in the shield division penetration waveguide concerning this embodiment. It is sectional drawing which shows the structure of the electromagnetic wave shielding part provided in the waveguide. It is a figure which shows the flow of the cable construction method to the shield division penetration waveguide which concerns on this embodiment, and is a perspective view which shows the state which installed the plate body which comprises an electromagnetic wave shielding part in a waveguide. It is a figure which shows the flow of the cable construction method to the shield division penetration waveguide which concerns on this embodiment, and is a perspective view which shows the state which accommodated the cable in the recessed groove of the board. It is a figure which shows the flow of the cable construction method to the shield division penetration waveguide which concerns on this embodiment, and is a perspective view which shows the state which laminated | stacked the other board body on the board body which accommodated the cable in the ditch | groove. . It is a figure which shows the flow of the cable construction method to the shield division penetration waveguide concerning this embodiment, and is a perspective view showing the state where other plate bodies were laminated. It is a plane sectional view showing the modification of the electromagnetic shielding structure in the shield division penetration waveguide concerning this embodiment.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, with reference to the accompanying drawings, an electromagnetic shield structure in a shielded section through waveguide and a method for carrying out a cable construction method for the shielded section through waveguide according to the present invention will be described based on the drawings.

FIG. 1 is a plan sectional view showing an electromagnetic shield structure in a shielded partitioning through waveguide according to the present embodiment. FIG. 2 is a cross-sectional view showing the configuration of the electromagnetic wave shielding portion provided in the waveguide. FIG. 3 is a diagram showing a flow of a cable construction method for the shielded partitioning through waveguide according to this embodiment, and is a perspective view showing a state in which a plate body constituting the electromagnetic wave shielding portion is installed in the waveguide. . FIG. 4 is a perspective view showing a state in which the cable is accommodated in the concave groove of the plate body. FIG. 5 is a perspective view showing a state in which another plate is laminated on the plate that accommodates the cable in the groove. FIG. 6 is a perspective view showing a state in which still another plate is laminated.
As shown in FIG. 1, for example, a shield section 10 used as a broadcasting studio or the like is partitioned on the inside and outside by a partition body 11 that forms walls, floors, ceilings, and the like having electromagnetic shielding performance.
In order to pass the cable C through the partition body 11 of the shield section 10, a cylindrical waveguide 13 is provided in the through hole 12 formed in the partition body 11. The waveguide 13 is made of a conductive material such as metal and is provided to extend on one side and the other side of the partition body 11. Here, the waveguide 13 is, for example, a rectangular tube having a rectangular shape in cross section.

An electromagnetic wave shielding portion 20 is provided at least at both end portions 13 a and 13 a of the waveguide 13. In this embodiment, the electromagnetic wave shielding portion 20 is provided over the entire length between the both end portions 13 a and 13 a of the waveguide 13.
As shown in FIG. 2, the electromagnetic shielding unit 20 is formed by laminating a plurality of plate bodies 21 in the vertical direction in the opening 13 k of the waveguide 13.

As shown in FIGS. 2 and 3, in each plate body 21, grooves 22 and protrusions 23 are alternately formed in the width direction orthogonal to the axial direction of the waveguide 13.
The concave groove 22 is formed in a substantially U shape in a sectional view by the first flat surface portion 24 and side wall portions 25 and 25 that rise in directions orthogonal to both ends of the first flat surface portion 24 in the width direction. As shown in FIG. 4, a plurality of cables C are accommodated in each of the concave grooves 22.
The ridge 23 is parallel to the side wall 25 of one of the concave grooves 22, 22 adjacent to each other in the width direction, the side wall 25 of the other concave groove 22, and the first flat surface 24. The side wall portions 25 and the second flat surface portion 26 that connects the 25 portions to each other are formed in a substantially inverted U shape in a sectional view.

  Moreover, the 2nd plane part 26 extended in the width direction outward is formed in the width direction both ends of each board 21, respectively.

  As such a plate body 21, for example, a corrugated steel sheet for construction used for a deck plate or the like can be suitably used.

As shown in FIGS. 2 and 5, the plate bodies 21 and 21 positioned above and below each other in the waveguide 13 are arranged so that the second flat portions 26 face each other. In other words, the upper plate body 21B is stacked with the upper plate body 21B inverted up and down so that the second flat surface portion 26 is located below and the first flat surface portion 24 is located above the lower plate body 21A.
Here, the plate bodies 21, 21 positioned above and below each other are fastened to the second flat portions 26, 26 formed at both ends in the width direction and facing each other by screws 27 or the like.

  In this way, in the plate bodies 21A and 21B positioned above and below each other, the concave grooves 22 and 22 face each other, thereby forming a cylindrical portion 30A that is rectangular in cross section and continuous in the axial direction of the waveguide 13. .

Furthermore, as shown in FIG. 2 and FIG. 6, on the plate body 21 </ b> B that is inverted up and down, the plate body 21 </ b> A in which the first plane portion 24 is positioned below and the second plane portion 26 is positioned above is arranged. The first planar portions 24 are stacked so that they face each other.
Thereby, in the lower plate body 21 </ b> B and the upper plate body 21 </ b> A, the protrusions 23, 23 face each other, so that a cylinder that is rectangular in cross section and continuous in the axial direction of the waveguide 13 therebetween. A shaped portion 30B is formed.

Thus, in the waveguide 13, the first plane portion 24 is positioned below, the second plane portion 26 is positioned upward, and the second plane portion 26 is positioned below, The plate bodies 21B on which the first plane portions 24 are positioned are stacked one after the other alternately.
As a result, the electromagnetic wave shielding portion 20 is formed with a large number of tubular portions 30A and tubular portions 30B having a rectangular cross-sectional view, in which a plurality of cables C are accommodated, in a honeycomb shape (staggered shape).

  Here, it is preferable to form the cylindrical portions 30A and 30B so that the inner dimensions thereof are ½ or less of the wavelength λ in the radio wave of the upper limit frequency to be shielded. Therefore, the width dimensions W1 and W2 of the first plane portion 24 and the second plane portion 26 are formed to be equal to or less than ½ of the wavelength λ in the radio wave of the upper limit frequency to be shielded. Further, the height dimension H of the side wall portion 25 is formed to be equal to or less than ¼ of the wavelength λ at the upper limit frequency of the radio wave to be shielded.

  Moreover, as shown in FIGS. 2-6, between the board | plate bodies 21A and 21B located up and down mutually, between the 1st plane parts 24 and 24 located up and down mutually, between the 2nd plane parts 26 and 26 A shield gasket 40 is sandwiched between them. The shield gasket 40 has a configuration in which, for example, a cylindrical covering made of a conductive material such as a metal film is filled with an elastic cushion material such as a sponge. By sandwiching such a shield gasket 40, the first flat portions 24, 24 positioned above and below and the second flat portions 26, 26 are closed, and the electromagnetic shielding properties between them are maintained. To do. Since the shield gasket 40 has elasticity, in the configuration in which only the both ends in the width direction of the plates 21A and 21B are connected by the screws 27, the plates 21A and 21B are caused by the weight of the cable C and the like. However, it may bend downward at the widthwise center. When such bending of the plate bodies 21A and 21B occurs, the seal gasket 40 can maintain the electromagnetic shielding property between the plate bodies 21A and 21B positioned above and below each other.

  The plurality of cables C to be inserted into the waveguide 13 are inserted into any of the cylindrical portions 30A and 30B. More specifically, a plurality of cables C can be inserted into each of the cylindrical portions 30A and 30B.

In order to configure the electromagnetic shielding unit 20 as described above, for example, a construction method as shown below can be adopted.
First, as shown in FIG. 3, a plate body 21 </ b> A in which the first plane portion 24 is located below and the second plane portion 26 is located above is installed in the opening 13 k of the waveguide 13.

Next, as shown in FIG. 4, the cable C inserted through the waveguide 13 is accommodated in each concave groove 22 of the plate body 21 </ b> A.
After storing a predetermined plurality of cables C in each concave groove 22, as shown in FIG. 5, the second flat surface portion 26 is positioned below and the first flat surface portion 24 is upward on the plate body 21A. The plate bodies 21B located at the positions are stacked. At this time, the shield gasket 40 is temporarily fastened with an adhesive, a double-sided adhesive tape or the like on each second flat portion 26 of the lower plate body 21A, so that the second plate bodies 21A and 21B positioned above and below each other. A shield gasket 40 is sandwiched between the flat portions 26 and 26. And plate body 21A, 21B located mutually up and down fastens the 2nd plane parts 26 and 26 located in the width direction both sides with the bis | screw 27. FIG.
Thereby, it will be in the state where a plurality of cables C were inserted in cylindrical part 30A.

Next, on the plate body 21B in which the second plane portion 26 is positioned below and the first plane portion 24 is positioned above, a groove-shaped portion (concave groove) formed on the back side of the ridge portion 23 facing downward. ) The cable C to be inserted into the waveguide 13 is accommodated in 23r.
As shown in FIG. 6, after the predetermined plurality of cables C are accommodated in each groove-like portion 23r in this way, the first flat surface portion 24 is positioned below the plate body 21B, and the second The plate body 21 </ b> A with the flat portion 26 positioned thereon is stacked. At this time, the shields 40 are temporarily fastened with adhesives, double-sided adhesive tape, etc. on the first flat portions 24 of the plate 21B positioned below, so that the plates 21A and 21B positioned above and below each other. The shield gasket 40 is sandwiched between the first flat portions 24 and 24.
Thereby, it will be in the state by which the several cable C was penetrated in the cylindrical part 30B.

Thereafter, the plate body 21 </ b> A is again laminated on the plate body 21 </ b> B, and the cable C to be inserted into the waveguide 13 is accommodated in each concave groove 22.
In this way, by sequentially repeating the above steps, a plurality of cables C are respectively provided in the cylindrical portions 30A and 30B of the electromagnetic wave shielding portion 20 configured by laminating a plurality of plates 21A and 21B. Can be accommodated.
Therefore, the cylindrical portions 30A and 30B ensure electromagnetic shielding properties and prevent electromagnetic waves from entering the inside of the shield section 11 from the outside to the inside through the waveguide 13.

  By the way, as shown in FIG. 2, when the accommodation number of the cable C in each of the cylindrical parts 30A and 30B is small and the porosity is high, the electromagnetic wave shielding material 50 is placed in the gaps in the cylindrical parts 30A and 30B. It may be filled. As such an electromagnetic wave shielding material 50, for example, a magnetic material such as ferrite is mixed into a polymer or rubber, and an electromagnetic wave absorber, copper hair, or the like can be used.

The waveguide 13 may be formed in a rectangular shape in cross section from the substantially U-shaped waveguide body 14 and the lid 15 in the region where the electromagnetic wave shielding unit 20 is provided. The waveguide main body 14 is formed of a bottom plate portion 14a and side wall portions 14b and 14b that rise upward from both ends in the width direction of the bottom plate portion 14a. The lid 15 is provided so as to cover the side walls 14b and 14b.
In such a configuration, a plurality of plate bodies 21A and 21B are sequentially stacked in the waveguide body 14 without attaching the lid body 15 as described above, and a cable is provided on each plate body 21A and 21B. Place C. Then, when the lamination of the predetermined number of plates 21A and 21B and the arrangement of the cable C are finished, the space between the side wall portions 14b and 14b of the waveguide body 14 is closed with the lid 15.
In this way, the cable C can be routed to the waveguide main body 14 in the state in which the upper portion is opened without attaching the lid 15.

According to the electromagnetic shield structure in the shielded partitioning through waveguide and the cable construction method for the shielded partitioning through waveguide described above, a plurality of plates 21 in which a plurality of concave grooves 22 are formed are laminated in the waveguide 13. By doing so, a large number of cylindrical portions 30A, 30B having electromagnetic shielding properties can be easily formed. If the cable C is inserted through such cylindrical portions 30A and 30B, the electromagnetic shielding property in the waveguide 13 penetrating the partition 11 can be easily ensured. Therefore, it is not necessary to install many thin waveguides.
Further, when the cable C is inserted, a plurality of cables C are accommodated from above in each of the concave grooves 22 of the plate body 21 arranged in the waveguide 13, and then another plate body is placed in the plate body 21. 21 are stacked. Accordingly, it is not necessary to insert the cable C through the thin waveguide, and the insertion operation of the cable C can be easily performed.
In this way, it is possible to easily install the waveguide 13 in the shield section 10 and to insert the cable C into the waveguide 13 and to reliably obtain the required shielding performance. .

  Further, by sandwiching the shield gasket 40 at a portion where the plate bodies 21 positioned above and below each other, the electromagnetic shielding properties between the plate bodies 21 positioned above and below can be ensured.

  Further, a steel plate for construction having a corrugated cross section can be used as the plate body 21. Thereby, the plate body 21 can be obtained at a low cost, and the cost can be reduced.

  The waveguide 13 includes a waveguide main body 14 having a U-shaped cross section and opened upward, and a lid 15 that covers the upper portion of the waveguide main body 14. Thus, after the work of stacking the plate bodies 21 and accommodating the cable C in the concave groove 22 is performed with the cover 15 open, the work can be performed by attaching the cover 15 to the waveguide body 14. Can be performed efficiently.

  Further, plate bodies 21 </ b> A and 21 </ b> B constituting the electromagnetic wave shielding unit 20 are provided over the entire length of the waveguide 13. Therefore, since the concave grooves 22 and the groove-like portions 23r of the plates 21A and 21B are continuous over the entire length of the waveguide 13, if the cable C is passed along the concave grooves 22 and the groove-like portions 23r, the waveguide 13 Can be easily inserted.

(Other embodiments)
The electromagnetic shield structure in the shielded section through waveguide of the present invention and the cable construction method to the shielded section through waveguide are not limited to the above-described embodiments described with reference to the drawings. Various modifications are conceivable within the technical scope.
For example, in the above-described embodiment, the plurality of plate bodies 21A and 21B are stacked to form the cylindrical portions 30A and 30B having a rectangular cross-sectional view, but the present invention is not limited thereto. For example, the cylindrical portions 30A and 30B can be formed into a circular shape in cross section, a hexagonal shape, and the like by laminating the plate material 21 with the concave groove 22 having a semicircular cross section, a trapezoidal cross section, and the like.

  Moreover, in the said embodiment, although the electromagnetic wave shielding part 20 was provided over the full length of the waveguide 13, it is not restricted to this. For example, as shown in FIG. 7, the electromagnetic wave shielding portions 20 may be provided only at both end portions 13 a and 13 a of the waveguide 13. Further, as shown in FIG. 7, the waveguide 13 is not limited to a straight line, and the end 13a may be bent, for example.

  Moreover, in the said embodiment, after accommodating the cable C in the ditch | groove 22 and the groove-shaped part 23r of each board 20, while the other board 20 was laminated | stacked, it is not restricted to this. After the predetermined number of plate bodies 20 are laminated in advance, the cable C may be inserted into the cylindrical portions 30A and 30B.

Furthermore, in the said embodiment, although the cable C was penetrated in the cylindrical parts 30A and 30B of the electromagnetic wave shielding part 20, it is not restricted to this. That is, the cylindrical portions 30A and 30B can be used as water and air flow paths for water supply, drainage, ventilation, air conditioning, and the like.
In addition to this, the configuration described in the above embodiment can be selected or changed to another configuration as appropriate without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 Shield division 11 Division body 12 Through-hole 13 Waveguide 13a End part 14 Waveguide main body 15 Cover body 20 Electromagnetic wave shielding part 21, 21A, 21B Plate body 22 Groove 23 Projection 23r Groove part (concave)
30A, 30B Cylindrical part 40 Shield gasket 50 Electromagnetic wave shielding material C Cable

Claims (5)

A waveguide formed of a conductive material, penetrating through the shield body having electromagnetic shielding properties;
A plate body formed of a conductive material and laminated in the waveguide, each having a plurality of concave grooves continuous in the axial direction of the waveguide;
Radio waves at the upper limit frequency that is formed by the concave groove formed in the lower plate body and the upper plate body, and whose inner dimensions are to be shielded, among the plate bodies positioned above and below each other in the waveguide. A cylindrical portion into which the cable is inserted, which is set to ½ or less of the wavelength of
A shield gasket having a cushioning property, made of a conductive material, sandwiched between portions where the plate bodies positioned above and below each other abut each other;
An electromagnetic shielding structure in a shielded section through waveguide, characterized by comprising: The electromagnetic shield structure in a shielded section through waveguide according to claim 1 , wherein the plate is a construction steel plate having a corrugated cross section. The said waveguide is equipped with the waveguide main body opened upwards with the U-shaped cross section, and the cover body which covers the upper direction of the said waveguide main body, The Claim 1 or 2 characterized by the above-mentioned. Electromagnetic shielding structure in shielded section through waveguide. Between each of the plurality of grooves, each of the plurality of plate bodies, a protrusion is provided, and the grooves and protrusions are alternately formed,
On the one plate body, the other plate bodies are turned upside down of the one plate body, and the concave grooves of each of the one plate body and the other plate body or The protruding portions are laminated so that they face each other, and the cylindrical portion is formed,
4. The electromagnetic wave in the shielded partitioning through-waveguide according to claim 1, wherein the shield gasket is sandwiched between the concave grooves facing each other or between the protrusions. 5. Shield structure. A step of accommodating the cable in the concave groove of the plate body disposed in the cylindrical waveguide penetrating the shield section and having a concave groove on the upper surface;
Made of a conductive material, the shielding gasket having a cushioning property, of the plate member, provided on protrusions provided between the groove, the step of laminating the other of said plate body on the shield gasket And a cable construction method for the shielded section through waveguide.

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