JP2005068748A - Electromagnetic wave shielding structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic wave shielding structure capable of effectively reducing leakage of an electromagnetic wave from clearance. <P>SOLUTION: In this electromagnetic wave shielding structure 10, a conductive part 16 of a conductive material 14 is stuck to one surface of respective core materials 12, and an opposed part 18 of the conductive material 14 is stuck to a header on the other core material 12 side in the respective core materials 12. Here, since a pair of conductive materials 14 have electric conductivity, when the electromagnetic wave arrives, the electromagnetic wave is reflected to the pair of conductive materials 14. Since the opposed area of the pair of conductive materials further increases, impedance of a capacitor composed of the pair of conductive materials 14 reduces, and intensity of the electromagnetic wave leaking from the clearance 20 reduces, and the leakage of the electromagnetic wave from the clearance 20 can be reduced. Thus, even if the pair of conductive materials 14 are not mutually electrically conducted, the electromagnetic wave can be effectively shielded. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electromagnetic wave shielding structure that shields (shields) electromagnetic waves.

  As an electromagnetic wave shield structure, there exists an electromagnetic wave shield surface which shields electromagnetic waves with each conductor by sticking a conductor on one side of each surface constituent member (for example, refer to patent documents 1).

  On this electromagnetic shielding surface, a metal base is placed at the boundary of each surface constituent member, and the conductor of each surface constituent member is made conductive by the metal base, or a metal plate is attached to the edge (end face) of each surface constituent member And by making the conductor of each surface component member conduct | electrically_connected by this metal plate, it is preventing that electromagnetic waves leak from the boundary part of each surface component member.

  However, in this electromagnetic wave shielding surface, in order to completely prevent leakage of electromagnetic waves from the boundary portion of each surface constituent member, it is necessary to conduct the conductor of each surface constituent member with no gap between the metal base and the metal plate. .

  Here, generally, an oxide film is present on the surfaces of the conductor, the metal base, and the metal plate by reaction with oxygen. For this reason, in order to make the conductor of each surface component member conduct | electrically_connected without a space | interval with a metal base | substrate or a metal plate, it is necessary to remove an oxide film over the whole from the contact part of a conductor and a metal base | substrate or a metal plate. . As a result, there is a problem in that complete removal of the oxide film is not guaranteed and the electromagnetic wave shielding effect cannot be surely exhibited, and furthermore, very complicated work is required for removing the oxide film.

  In addition, when it is necessary to leave a gap between each surface component (including the case where a joint or a void joint is provided between each surface component), leave a gap between each surface component. Even if it is better to keep the gap between each surface component member (when it is difficult or impossible to close the gap between each surface component member), leakage of electromagnetic waves from this gap member Technology to reduce is necessary.

  As a case where it is necessary to leave a gap between the surface constituent members, it may be necessary to absorb the displacement of the surface constituent members during an earthquake. In general, assuming that the interlayer height (the height of the part for installing one surface constituent member) and the interlayer deformation angle of the surface constituent member are H and R, the surface constituent member against the inertial force at the time of earthquake In order to absorb the forced deformation, it is necessary to leave a gap of width H × R in the lateral direction and the height direction of each surface constituent member.

  For example, when the surface component is applied to a so-called dry partition wall and one layer (one sheet in the height direction) is installed between the floors of each floor of the building, the interlayer height H (floor If the height is 2800 mm and the inter-layer deformation angle R is 1/600 (standard of the inter-layer deformation angle R for design during a medium-scale earthquake when a general RC structure or SRC structure is targeted), about 4 It is necessary to leave a gap of 7 mm (2800 mm / 600) or more in the horizontal direction between the surface constituent members and in the height direction between the surface constituent members and the floors.

  Furthermore, the surface component is applied to so-called interior stone-clad or a material equivalent to this (such as foamed glass panel), and one layer (one sheet in the height direction) between the floor and the ceiling of the building When installed, if the interlayer height H (ceiling height, which is the height from the floor to the ceiling) is 2400 mm and the interlayer deformation angle R is 1/600, the gap is about 4 mm (2400 mm / 600) or more. It is necessary to leave (joints) in the horizontal direction between the surface constituent members and in the height direction between the surface constituent members and the floor and the ceiling.

  In addition, when the surface component is applied to the system ceiling and one surface component (one in the height direction) is installed between the ceiling of the building and the floor (slab) of the upper floor, When the interlayer height H (height from the ceiling to the floor) is 600 mm and the interlayer deformation angle R is 1/600, a gap of about 1 mm (600 mm / 600) or more is formed on each surface constituent member. It is necessary to leave in the horizontal direction between them and in the height direction between each surface component and the ceiling and floor.

  Furthermore, when the surface component is applied to a door and one surface component (door) is installed on the wall between the floor and ceiling of the building, When the height H (ceiling height or wall height) is 2400 mm and the interlayer deformation angle R is 1/600, a gap of about 4 mm (2400 mm / 600) or more is formed between the surface constituent member and the wall. In addition, it is necessary to make a space in the height direction between the surface constituent member and the ceiling and the floor.

  When it is necessary to provide a gap between the surface constituent members, and when it is necessary to absorb deformation due to expansion and contraction due to temperature changes of the surface constituent members, the dimensions of the materials may be equalized during manufacturing. When constructing a surface constituent member having a problem in dimensional stability, such as a difficult foam glass panel, a joint may be provided between the surface constituent members due to a design relationship.

  Here, when the conductor of each surface constituent member is made conductive with a metal plate, such as the electromagnetic wave shielding surface, there is no gap between the surface constituent members. When a gap is left, there arises a problem that electromagnetic waves leak from this gap.

  As a case where it is better to leave a gap between each surface constituent member, for example, the surface constituent member may be applied to each ceiling plate of the system ceiling. In this case, the surface component member (ceiling board) is simply placed and installed on the suspension fitting, but this is because the surface component member can be easily opened and closed from the indoor side during maintenance.

  Here, when the conductors of the respective surface constituent members such as the electromagnetic wave shielding surface are made conductive without gaps between the metal bases, there arises a problem that the surface constituent members cannot be opened and closed from the indoor side.

  As a case where a gap must be provided between each surface constituent member, for example, the surface constituent member may be applied to a door, a door frame, and a shoe rubbing portion immediately below the door. In this case, a gap is inevitably left between the door (surface component) and the door frame (surface component) or between the lower end of the door and the shoe rubbing portion (surface component) to open and close the door. It is necessary.

  Here, when the gap between the lower end of the door and the shoe rubbing portion is closed with a metal plate affixed to the edge of the lower end of the door, such as the electromagnetic wave shielding surface, the metal plate is worn when the door is opened and closed. There is a problem that a gap is formed, and electromagnetic waves leak from the gap.

  Further, when the door and the shoe rubbing portion are electrically connected with no gap between the door and the shoe rubbing surface as in the electromagnetic wave shielding surface, there arises a problem that the door cannot be opened and closed.

  In addition, when the gap between the lower end of the door and the shoe rubbing part is closed with a metal brush attached to the edge of the lower end of the door, the metal brush is worn when the door is opened and closed, resulting in a gap. There arises a problem that electromagnetic waves leak from this gap.

As described above, when it is necessary to leave a gap between each surface constituent member, when it is better to leave a gap between each surface constituent member, and when there is no gap between each surface constituent member If this is not the case, the electromagnetic wave shielding surface cannot provide any technique for reducing leakage of electromagnetic waves from the gap.
JP 2001-164673 A

  In view of the above fact, an object of the present invention is to obtain an electromagnetic wave shielding structure that can effectively reduce leakage of electromagnetic waves from a gap.

  The electromagnetic wave shielding structure according to claim 1 has a conductive first conductive member, and has a conductive state, and is not parallel to the first conductive member or bent with respect to the first conductive member. A first opposing member that is electrically connected to the first conductive member in a state; and a conductive member that is electrically conductive and disposed on a side of the first conductive member without being electrically connected to the first conductive member and the first opposing member. A second facing member facing the first facing member.

  The electromagnetic wave shielding structure according to claim 2 is the electromagnetic wave shielding structure according to claim 1, wherein the electromagnetic wave shielding structure has conductivity, is not electrically connected to the first conductive member and the first opposing member, and is not connected to the second opposing member. It is characterized by comprising a second conductive member conducted to the second opposing member in a non-parallel state or a state bent with respect to the second opposing member.

  The electromagnetic wave shield structure according to claim 3 is the electromagnetic wave shield structure according to claim 1 or 2, wherein the first opposing member and the second opposing member are arranged substantially parallel to each other. Yes.

  The electromagnetic wave shield structure according to claim 4 is the electromagnetic wave shield structure according to any one of claims 1 to 3, wherein a dielectric is provided between the first opposing member and the second opposing member. It is characterized by that.

  The electromagnetic wave shielding structure according to claim 5 is the electromagnetic wave shielding structure according to any one of claims 1 to 4, wherein the electromagnetic wave is lost between the first opposing member and the second opposing member. It is characterized in that a loss material is provided.

  The electromagnetic wave shielding structure according to claim 6 is the electromagnetic wave shielding structure according to any one of claims 1 to 5, wherein the thickness of the first opposing member, the thickness of the second opposing member, and the It is characterized in that at least one of the intervals between the first facing member and the second facing member is set to ¼ or less of the wavelength of the electromagnetic wave to be shielded.

  The electromagnetic wave shielding structure according to claim 7 is the electromagnetic wave shielding structure according to any one of claims 1 to 6, and has electromagnetic wave absorption performance, wherein the first conductive member and the second opposing member are It is characterized by comprising a plurality of attachment members attached respectively.

  An electromagnetic wave shielding structure according to an eighth aspect is characterized in that in the electromagnetic wave shielding structure according to the seventh aspect, at least a part of the mounting member is made of a soft material.

  The electromagnetic wave shielding structure according to claim 9 is the electromagnetic wave shielding structure according to any one of claims 1 to 8, wherein at least one of the first opposing member and the second opposing member is the first conductive member. It is characterized by being arranged non-perpendicular to.

  The electromagnetic wave shield structure according to claim 10 is the electromagnetic wave shield structure according to any one of claims 1 to 9, wherein at least one of the first opposing member and the second opposing member is provided with a concave portion or a convex portion. It is provided.

  The electromagnetic wave shield structure according to claim 11 is the electromagnetic wave shield structure according to any one of claims 1 to 10, wherein a predetermined length is provided between the first opposing member and the second opposing member. It is characterized by sandwiching a spacer.

  The electromagnetic wave shielding structure according to claim 12 is the electromagnetic wave shielding structure according to any one of claims 1 to 11, wherein at least one of the first conductive member, the first opposing member, and the second opposing member. It is characterized in that it can be moved.

  The electromagnetic wave shielding structure according to claim 13 is the electromagnetic wave shielding structure according to any one of claims 1 to 12, wherein the first opposing member faces the second opposing member and the second opposing member. A width of the facing surface of the facing member with respect to the first facing member is set to 20 mm or more, and an interval between the first facing member and the second facing member is set to 20 mm or less.

  In the electromagnetic wave shielding structure according to claim 1, since the first conductive member, the first opposing member, and the second opposing member have conductivity, the electromagnetic waves are reflected on the first conductive member, the first opposing member, and the second opposing member. Is done.

  In addition, the first opposing member is electrically connected to the first conductive member, and the second opposing member is disposed on the side of the first conductive member without being electrically connected to the first conductive member and the first opposing member.

  Here, the 1st opposing member is made into the state made non-parallel with respect to the 1st conductive member, or the state bent with respect to the 1st conductive member, and is facing the 2nd opposing member. For this reason, the opposing area (area (facing area) in a direction perpendicular to the opposing direction (facing direction)) between the first opposing member and the second opposing member can be increased, and the first opposing member and the second opposing member are configured. The impedance (resistance) of the capacitor can be reduced. Thereby, the leakage of the electromagnetic wave from the clearance gap between a 1st electrically-conductive member (1st opposing member) and a 2nd opposing member can be reduced effectively.

  As described above, electromagnetic waves can be effectively shielded without conducting the first conductive member (first opposing member) and the second opposing member.

  In the electromagnetic wave shielding structure according to claim 2, the second conductive member that has conductivity and is conducted to the second opposing member is not parallel to the second opposing member or the second opposing member. Since it is in a bent state, electromagnetic waves are reflected by the second conductive member also on the side of the first conductive member. For this reason, electromagnetic waves can be shielded in a wide range.

  In the electromagnetic wave shielding structure according to claim 3, since the first opposing member and the second opposing member are arranged substantially parallel to each other, the opposing area between the first opposing member and the second opposing member is reliably increased, and the first The impedance of the capacitor constituted by the opposing member and the second opposing member can be reliably reduced. Thereby, the leakage of the electromagnetic wave from the clearance gap between a 1st electrically-conductive member (1st opposing member) and a 2nd opposing member can be reduced reliably and effectively.

  In the electromagnetic wave shielding structure according to claim 4, since the dielectric is provided between the first opposing member and the second opposing member, the impedance of the capacitor constituted by the first opposing member and the second opposing member is further reduced. And leakage of electromagnetic waves from the gap between the first conductive member (first opposing member) and the second opposing member can be more effectively reduced.

  In the electromagnetic wave shielding structure according to claim 5, since the loss material provided between the first opposing member and the second opposing member causes the electromagnetic wave to be lost, the first conductive member (first opposing member) and the second opposing member are lost. The leakage of electromagnetic waves from the gap between the members can be reduced more effectively.

  In the electromagnetic shielding structure according to claim 6, at least one of the thickness of the first opposing member, the thickness of the second opposing member, and the interval between the first opposing member and the second opposing member is the wavelength of the electromagnetic wave to be shielded. Therefore, the electromagnetic wave to be shielded can be prevented from having a resonance mode between the first opposing member and the second opposing member, and the first conductive member (first opposing member) and the first It can prevent that the electromagnetic wave shielding performance in the clearance gap between 2 opposing members is impaired.

  In the electromagnetic wave shielding structure according to claim 7, since the plurality of attachment members to which the first conductive member and the second opposing member are respectively attached have electromagnetic wave absorption performance, at least the first conductive member and the second opposing member arrive. Each mounting member can absorb the electromagnetic wave to be performed. Further, each mounting member can absorb at least the electromagnetic waves reflected by the first conductive member and the second opposing member, and the electromagnetic waves are reflected by other members and arrive at the first conductive member and the second opposing member again. In some cases, each mounting member can absorb this electromagnetic wave. Thereby, electromagnetic waves can be shielded more effectively.

  In the electromagnetic wave shielding structure according to claim 8, since at least a part of the mounting member is made of a soft material, damage to the mounting member can be suppressed.

  In the electromagnetic wave shielding structure according to claim 9, since at least one of the first opposing member and the second opposing member is arranged non-perpendicular to the first conductive member, the opposing area between the first opposing member and the second opposing member is This effectively increases the impedance of the capacitor constituted by the first opposing member and the second opposing member, and can be further reduced. Thereby, the leakage of electromagnetic waves from the gap between the first conductive member (first opposing member) and the second opposing member can be more effectively reduced.

  In the electromagnetic wave shield structure according to claim 10, since the concave portion or the convex portion is provided in at least one of the first opposing member and the second opposing member, the opposing area between the first opposing member and the second opposing member is effectively large. Thus, the impedance of the capacitor constituted by the first opposing member and the second opposing member can be further reduced. Thereby, the leakage of electromagnetic waves from the gap between the first conductive member (first opposing member) and the second opposing member can be more effectively reduced.

  In the electromagnetic wave shielding structure according to claim 11, since the spacer having a predetermined length is sandwiched between the first opposing member and the second opposing member, the gap between the first opposing member and the second opposing member is accurately set. It can be a predetermined length.

  In the electromagnetic wave shielding structure according to claim 12, since at least one of the first conductive member, the first opposing member, and the second opposing member is movable, the first conductive member, the first opposing member, and the second opposing member By moving at least one, the operation and release of the electromagnetic wave shielding function can be switched.

  In the electromagnetic wave shielding structure according to claim 13, the width of the facing surface of the first facing member to the second facing member and the facing surface of the second facing member to the first facing member is set to 20 mm or more, and the first facing Since the distance between the member and the second opposing member is 20 mm or less, the impedance of the capacitor constituted by the first opposing member and the second opposing member can be reliably reduced, and the frequency of the incoming electromagnetic wave is 1 GHz or more and 3 GHz. In this case, leakage of electromagnetic waves from the gap between the first conductive member (first opposing member) and the second opposing member can be reliably and effectively reduced.

(Basic structure)
FIG. 1 is a sectional view showing a basic structure of an electromagnetic wave shielding structure 10 according to an embodiment of the present invention.

  The electromagnetic wave shield structure 10 according to the present embodiment includes a pair of rectangular plate-like core members 12 made of, for example, wood or gypsum (made of cement) as a mounting member as a basic structure, and the pair of core members 12 are arranged in parallel. Is arranged.

  A conductive material 14 made of, for example, aluminum (which may be made of iron, copper, or the like) is attached to the front surface or the back surface of each core member 12, and each conductive material 14 has conductivity. And not conducting to each other. Moreover, the part affixed on the core material 12 of the electroconductive material 14 is made into the electroconductive part 16 as a 1st electroconductive member or a 2nd electroconductive member.

  Each conductive material 14 is bent (bent) at one end on the other conductive material 14 side to be a facing portion 18 as a first facing member or a second facing member. In addition to being integrated with each conductive portion 16 and being electrically connected, each core member 12 is attached to the entire small edge (end surface) on the other core member 12 side. For this reason, each opposing part 18 is arrange | positioned perpendicularly | vertically with respect to each electroconductive part 16, and has opposed in the state mutually arrange | positioned in parallel. In addition, a gap 20 (space) is formed between the pair of opposed portions 18 (conductive material 14).

  Next, the operation of the present embodiment will be described.

  In the electromagnetic wave shield structure 10 having the above configuration, since the pair of conductive materials 14 have conductivity, the electromagnetic waves are reflected by the pair of conductive materials 14 when electromagnetic waves arrive.

  FIG. 2 is a longitudinal sectional view showing the basic structure of the electromagnetic wave shielding structure 22 according to the comparative example.

  This electromagnetic wave shield structure 22 is different from the electromagnetic wave shield structure 10 according to the present embodiment only in that each opposed portion 18 is not provided.

  When the gap 20 between the pair of conductive materials 14 (conductive portions 16) is smaller than the wavelength of the electromagnetic wave, when an electromagnetic wave arrives at the electromagnetic wave shield structure 22, a surface current (see FIG. 2 flows, a displacement current (reciprocating arrow B in FIG. 2) flows through the gap 20, and a surface current (reciprocating arrow A in FIG. 2) flows through the other conductive material. By the way, since electromagnetic waves are alternating current, the magnitude and direction of the displacement current change with time. For this reason, an electromagnetic field is generated by generating a magnetic field and generating an electric field in the gap 20 by the displacement current. Although this electromagnetic wave partially propagates to the electromagnetic wave arrival side, it propagates to the anti-electromagnetic wave arrival side and becomes an electromagnetic wave leaking from the gap 20.

  In general, the strength of the electromagnetic wave leaking from the gap 20 increases as the potential difference between the pair of conductive materials 14 increases. Therefore, in order to reduce the strength of the electromagnetic wave leaking from the gap 20, the pair of conductive materials 14 What is necessary is just to make the impedance of the capacitor | condenser comprised by these small.

  As shown in FIG. 3A, in the electromagnetic wave shield structure 22, a pair of conductive materials 14 constitute a capacitor.

In general, the impedance R of the capacitor is such that the dielectric constant of the dielectric existing in the gap 20 is ε, the distance between the pair of conductive materials 14 is d, the opposing area of the pair of conductive materials 14 is S, When the capacitance is C = ε · (S / d), the frequency of the incoming electromagnetic wave is f, and each frequency of the incoming electromagnetic wave is ω = 2πf,
R = 1 / (C · ω) = 1 / {ε · (S / d) · 2πf} (1)
It becomes.

  Therefore, the impedance R of the capacitor is such that the larger the facing area S of the pair of conductive materials 14 is, the smaller the distance d between the pair of conductive materials 14 is, the smaller the dielectric constant ε of the dielectric existing in the gap 20 is. The larger it is, the smaller it can be. Note that air is a substance having a minimum dielectric constant ε, and the impedance R of the capacitor can be reduced by inserting a dielectric other than air into the gap 20.

Here, in the electromagnetic wave shield structure 22 according to the comparative example, assuming that the capacitance of the capacitor constituted by the pair of conductive materials 14 is C ₁ , the impedance Z ₁ of the entire circuit is
Z ₁ = 1 / (C ₁ · ω) (2)
It becomes.

On the other hand, as shown in FIG. 3B, in the electromagnetic wave shielding structure 10 according to the present embodiment, the displacement current flowing through the gap 20 is alternating current, but since alternating current flows through the capacitor, a parallel circuit of capacitors is configured. ing. That is, a portion other than the connection portion between the capacitor C ₁ and the conductive portion 16 of the pair of opposing portions 18, which is configured by the connection portion with the conductive portion 16 of the pair of opposing portions 18. A parallel circuit with a capacitor having a capacitance C ₂ is configured.

The impedance Z of this entire circuit is
Z = 1 / {(C ₁ + C ₂ ) · ω} (3)
Thus, Z <1 / (C ₁ · ω), Z <1 / (C ₂ · ω), and the impedance Z of the entire circuit is smaller than the impedance R of any capacitor.

  In other words, in the electromagnetic wave shield structure 10 according to the present exemplary embodiment, since the facing area S of the pair of conductive materials 14 is increased, the configuration of the pair of conductive materials 14 (facing portions 18) is obtained from Equation (1). The impedance R of the capacitor is reduced.

  For this reason, the intensity of the electromagnetic wave leaking from the gap 20 is reduced, and the leakage of the electromagnetic wave from the gap 20 can be effectively reduced.

  As described above, electromagnetic waves can be effectively shielded without causing the pair of conductive materials 14 to conduct with each other.

  Further, since the pair of facing portions 18 are arranged in parallel to each other, the facing area of the pair of facing portions 18 is reliably increased, and the impedance R of the capacitor constituted by the pair of conductive materials 14 can be reliably reduced. . Thereby, leakage of electromagnetic waves from the gap 20 can be reliably and effectively reduced.

(Modification)
The electromagnetic wave shielding structure 10 according to the present embodiment may be configured as the following modification.

  In FIG. 4A, the conductive portion 16 is attached to the front surface or the back surface of the core member 12, and the facing portion 18 is attached to the entire fore edge at least at both ends of the core member 12.

  In FIG. 4B, the conductive portion 16 is attached to the front surface and the back surface of the core material 12, and the facing portion 18 is attached to the entire fore edge of at least both ends of the core material 12.

  In FIG. 4C, the conductive portion 16 is attached to the front surface or the back surface of the core material 12. Furthermore, the opposing part 18 is affixed on the whole small edge of at least both ends of the core material 12, and each opposing part 18 is extended over the core material 12 to the anticonductive part 16 side.

  In FIG. 4D, the conductive portion 16 is attached to the front surface and the back surface of the core material 12. Further, facing portions 18 are affixed to the entire fore edge of at least both ends of the core member 12, and each facing portion 18 extends beyond each conductive portion 16 to the outside in the vertical direction of each conductive portion 16.

  In FIG. 4E, the conductive portion 16 is attached to the front surface or the back surface of the core material 12, and the facing portion 18 is attached to at least part of the fore ends of the core material 12.

  In FIG. 4F, the conductive portion 16 is disposed inside the core material 12 (in the thickness direction center). Furthermore, facing portions 18 are affixed to the entire edge of at least both ends of the core material 12, and each facing portion 18 extends beyond the core material 12 to both sides in the vertical direction of the conductive portion 16.

  Here, as shown in FIG. 4C, FIG. 4D, and FIG. 4F, by increasing the area of the facing surface of the facing portion 18 that faces the other facing portion 18, the above formula (1) is obtained. The impedance of the capacitor constituted by the pair of conductive materials 14 is reduced, and the leakage of electromagnetic waves from the gap 20 can be effectively reduced.

  In FIG. 5A, a columnar spacer 24 having a predetermined length is disposed in the gap 20 and is sandwiched between the pair of opposed portions 18. For this reason, the space | interval of the clearance gap 20 can be correctly made into predetermined length.

  In FIG. 5B, a dielectric 26 (silicon or the like) other than air is placed in the entire gap 20. For this reason, the impedance of the capacitor constituted by the pair of conductive materials 14 from the above formula (1) is reduced, and leakage of electromagnetic waves from the gap 20 can be further effectively reduced.

  In FIG. 5C, the part adjacent to the other core material 12 of each core material 12 is composed of a soft material 28 (elastic member) such as sponge. For this reason, even when the core material 12 is applied to a partition wall, a door, or the like, and the interval of the gap 20 is required to be about 10 mm, such as the end of the partition wall or the lower end of the door, the core material 12 at the time of the earthquake Since the soft material 28 is elastically deformed against forced deformation or the like, damage to the core material 12 can be suppressed.

  Moreover, although not shown in figure, it is good also as a structure by which a pair of opposing part 18 is arrange | positioned non-parallel.

(Experimental example)
In FIG. 6, in the electromagnetic wave shielding structure 22 according to the comparative example, when the gap 20 is 4 mm, the frequency of the incoming electromagnetic wave and the electromagnetic wave shielding performance of the gap 20 (the electromagnetic wave passes through the gap 20). This is an experimental result of the relationship between the loss electric field strength and the “insertion loss” in the drawing.

  6 that the electromagnetic wave shielding performance of the gap 20 is about 20 dB when the frequency of the incoming electromagnetic wave is in the range of 1.0 GHz to 3.0 GHz.

  FIG. 7 shows experimental results for indoor wireless LAN (frequency band 2.4 GHz, communication speed 2 Mbpm) communication. FIG. 7A shows the distance from the transmitting antenna and the electromagnetic wave. FIG. 7B shows the distance from the transmitting antenna to the receiving antenna (indicated as “distance between wireless LAN slaves” in FIG. 7B), and the electromagnetic field. The relationship with the communication speed is shown. In (A) and (B) of FIG. 7, the dotted pattern graph on the back side of the paper shows a case where there is no obstacle between the transmission point and the reception point of the electromagnetic wave, and there is no pattern on the front side of the paper. The graph shows a case where there is a non-metallic obstacle such as a partition between an electromagnetic wave transmission point and a reception point.

  FIG. 7A shows that the electric field strength of electromagnetic waves tends to attenuate (loss) from 15 dB to 20 dB when the distance from the transmitting antenna (propagation distance) is 20 m to 30 m.

  FIG. 7B shows that the communication speed is not 0 kbps even when the distance from the transmitting antenna is about 30 m and communication is possible.

  From the above, it is considered that the electromagnetic wave shielding performance of the gap 20 is preferably about 30 dB or more.

  In FIG. 8, in the electromagnetic wave shielding structure 22 according to the comparative example and the electromagnetic wave shielding structure 10 according to the present embodiment, the core material 12 is formed into a wooden board having a thickness of 20 mm, and the conductive material 14 has a thickness of 1.. The experimental result of the relationship between the frequency of the incoming electromagnetic wave and the electromagnetic wave shielding performance of the gap 20 when the aluminum plate is 5 mm is shown. Further, FIG. 8A shows a case where the gap 20 is set to 1 mm, and FIG. 8B shows a case where the gap 20 is set to 4 mm.

  From FIG. 8A, when the interval of the gap 20 is set to 1 mm, the electromagnetic wave shielding structure 22 (a of FIG. 8A) has a frequency of the incoming electromagnetic wave in the range of 2.4 GHz to 2.5 GHz. ) Has an electromagnetic shielding performance of about 20 dB, while the electromagnetic shielding performance of the gap 20 in the electromagnetic shielding structure 10 (b in FIG. 8A) is about 50 dB to 60 dB. For this reason, the electromagnetic wave shielding performance of the gap 20 in the electromagnetic wave shielding structure 10 sufficiently satisfies the target of about 30 dB to 40 dB or more.

  From FIG. 8B, when the interval of the gap 20 is set to 4 mm, the electromagnetic wave shielding structure 22 (a of FIG. 8B) has a frequency in the range of 2.4 GHz to 2.5 GHz. ) Is about 20 dB, while the electromagnetic shielding performance of the gap 20 in the electromagnetic shielding structure 10 (b in FIG. 8B) is about 40 dB. For this reason, the electromagnetic wave shielding performance of the gap 20 in the electromagnetic wave shielding structure 10 satisfies the target of about 30 dB to 40 dB or more.

  From the above, it can be seen that the electromagnetic wave shielding structure 10 according to the present embodiment greatly improves the electromagnetic wave shielding performance of the gap 20 as compared with the electromagnetic wave shielding structure 22 according to the comparative example.

  8A and 8B that the electromagnetic wave shielding performance of the gap 20 is improved when the gap 20 is narrowed from 4 mm to 1 mm. This can be understood from the above formula (1) because the impedance of the capacitor decreases as the distance d between the pair of conductive materials 14 decreases, and the electromagnetic wave shielding performance of the gap 20 improves. This also means that the electromagnetic wave shielding performance of the gap 20 can be selectively changed by changing the interval of the gap 20.

Furthermore, in the electromagnetic shielding structure 22 according to the comparative example, the opposing area of the pair of conductive materials 14 is 1.5 mm ² per unit length (the thickness (1.5 mm) of the conductive material 14 and the unit length (1 mm)). )). On the other hand, in the electromagnetic wave shielding structure 10 according to the present exemplary embodiment, the opposing area of the pair of conductive materials 14 is 21.5 mm ² per unit length (the width (21.5 mm) of the opposing portion 18 and the unit length (1 mm). )). Here, it can be seen from FIGS. 8A and 8B that increasing the opposing area of the pair of conductive materials 14 improves the electromagnetic shielding performance of the gap 20. This can be understood from the above formula (1) because the impedance of the capacitor decreases as the facing area S of the pair of conductive materials 14 increases and the electromagnetic shielding performance of the gap 20 improves. This also means that the electromagnetic wave shielding performance of the gap 20 can be selectively changed by changing the facing area S of the pair of conductive materials 14.

  Further, from the above formula (1), it is expected that the impedance of the capacitor decreases as the frequency f of the incoming electromagnetic wave increases, and the electromagnetic shielding performance of the gap 20 improves. 8A and 8B also show a tendency that the electromagnetic wave shielding performance of the gap 20 is improved as the frequency f of the incoming electromagnetic wave increases, and the validity of the principle of the equation (1) is shown. It is thought that.

  Here, the frequency band of the wireless LAN is shifting to a frequency band (for example, 5 GHz band) higher than the current 2.4 GHz to 2.5 GHz for the purpose of increasing the communication speed, and in the future, a higher frequency It is also expected to shift to the belt. According to the above formula (1), it is considered that the electromagnetic wave shielding effect exhibited by the present invention improves as the frequency of electromagnetic waves increases, and the present invention is effective in the future.

  9 and 10, in the electromagnetic wave shielding structure 10 according to the present embodiment, the core material 12 is made of a nonconductive material panel such as wood or plastic, and the conductive material 14 has a thickness of about 0 mm. When the plate is made of aluminum, the thickness of the core material 12 corresponding to the facing area of the pair of conductive materials 14 (facing portions 18) (indicated simply as “thickness” in the drawing) is 20 mm, 30 mm, 40 mm, For each 50 mm, an experimental result of the relationship between the gap 20 interval (indicated as “gap” in the drawing) and the electromagnetic shielding performance of the gap 20 is shown. In this case, the electromagnetic wave has arrived (incident) along the vertical direction of the surface of the core 12, and the electromagnetic shielding performance of the gap 20 is based on the electric field strength of the incoming electromagnetic wave and the electric field strength of the electromagnetic wave transmitted through the gap 20. It has been calculated.

  FIG. 9A shows the case where the frequency of the incoming electromagnetic wave is set to 2.45 GHz and a dielectric (air) having a dielectric constant ε of 1.0 F / m is inserted into the gap 20. FIG. 9B shows the case where the frequency of the incoming electromagnetic wave is set to 5.2 GHz and a dielectric (air) having a dielectric constant ε of 1.0 F / m is inserted into the gap 20. Yes. Further, FIG. 10A shows the case where the frequency of the incoming electromagnetic wave is set to 2.45 GHz and a dielectric having a dielectric constant ε of 4.0 F / m is inserted into the gap 20. 10 (B) shows a case where the frequency of the incoming electromagnetic wave is set to 5.2 GHz and a dielectric having a dielectric constant ε of 4.0 F / m is inserted into the gap 20.

  9 and 10, when the thickness of the core material 12, the gap 20 and the dielectric constant ε of the dielectric are the same, the higher the frequency of the incoming electromagnetic wave, the higher the electromagnetic shielding performance of the gap 20. There is a tendency to improve. Furthermore, when the thickness of the core material 12, the gap 20 and the frequency of the incoming electromagnetic wave are the same, inserting a dielectric other than air into the gap 20 tends to improve the electromagnetic shielding performance of the gap 20. is there.

  9 and 10, the table of FIG. 11 showing the intervals of the gaps 20 that can ensure the electromagnetic wave shielding performance (shielding performance) of the gaps 20 of 30 dB or more is derived. Further, the thickness of the core 12 and the gaps 20 The graph of FIG. 12 which shows the border line which satisfies the electromagnetic wave shielding performance of the clearance gap 20 of 30 dB or more in the above is derived. 11 and 12, the frequency of the incoming electromagnetic wave is simply indicated as “frequency”, and in FIG. 12, the dielectric constant of the dielectric is simply indicated as “dielectric constant”. In FIG. 12, the lower side of the graph of each border line is a region that satisfies the electromagnetic wave shielding performance of the gap 20 of 30 dB or more.

  11 and 12, the thickness of the core material 12 can be optimally set according to the required gap 20 interval.

  Further, when the frequency of the incoming electromagnetic wave is 1 GHz or more and 3 GHz or less, the thickness of the core material 12 (the width of the facing surface of the facing portion 18) is set to 20 mm or more in order to make the electromagnetic shielding performance of the gap 20 about 30 dB. In addition, the gap 20 is preferably 20 mm or less.

  In addition, when the electromagnetic wave is shielded by providing a large capacitance (capacitance) between the pair of conductive materials 14 as in the present invention, the resonance mode is not provided in the gap 20 with respect to the electromagnetic wave to be shielded. Is important. This is because when the electromagnetic wave vibrates vigorously in the gap 20 with a resonance mode, the electromagnetic shielding performance of the gap 20 is impaired. In order not to have a resonance mode in the gap 20 with respect to the electromagnetic wave to be shielded, the thickness of the conductive material 14 (opposing portion 18) and the interval between the gaps 20 are not more than λ / 4 (λ is the wavelength of the electromagnetic wave to be shielded). ) Or a dielectric loss material (such as a dielectric material such as silicon in which a conductive material such as carbon powder is mixed) or a magnetic loss material (such as a dielectric material such as silicon). It is considered effective to provide the gap 20 with a magnetic material such as ferrite powder. If the gap 20 cannot be made λ / 4 or less, it is confirmed in advance by experiment or simulation whether the electromagnetic wave to be shielded has a resonance mode in the gap 20. It is desirable to use technology.

(First embodiment)
FIG. 13A is a perspective view showing the component member 30 of the electromagnetic wave shielding structure 10 according to the first embodiment, and FIG. 13B is a sectional view showing the installation state of the electromagnetic wave shielding structure 10. It is shown in the figure.

  The component member 30 of the electromagnetic wave shielding structure 10 according to the first embodiment is a square glass panel (for example, a panel having a vertical and horizontal length of about 445 mm and a thickness of about 20 mm) that functions as the core material 12. The foamed glass panel 32 has a foamed glass layer 34, a glass cullet layer 36 that is a surface layer of the foamed glass layer 34, and a back-side reinforcing sheet (not shown) on the back surface. Stainless steel fibers 38 are mixed in the foamed glass layer 34, whereby the foamed glass panel 32 has electromagnetic wave absorbing performance.

  An aluminum sheet-like conductive material 14 is affixed to the foamed glass panel 32, and the conductive portion 16 (electromagnetic wave reflecting sheet) is affixed to the back surface of the foamed glass panel 32, and the foamed glass panel 32. A counter part 18 is affixed to the whole of all the small openings.

  The plurality of component members 30 are installed on the concrete foundation 40 in a state of being arranged vertically and horizontally. Each constituent member 30 is attached to the concrete base 40 by a columnar adhesive 42 installed on the concrete base 40, and each constituent member 30 is supported by the adhesive 42 at both ends (or full corners). Yes. The adhesive 42 is, for example, a sponge impregnated with urethane.

  A gap 20 (joint) is formed between the constituent members 30 from the viewpoint of displacement and design of the constituent members 30 during the earthquake. Each gap 20 has a spacing of several millimeters, and each gap 20 has a structure in which a sealing agent 44 as a dielectric is applied or is open.

  Here, in the electromagnetic wave shielding structure 10 according to the first example, the leakage of electromagnetic waves from the gap 20 even when the sealing agent 44 in the gap 20 does not have electromagnetic shielding performance or when the gap 20 is left open. Can be effectively reduced.

  Furthermore, since the foamed glass panel 32 has electromagnetic wave absorbing performance, the foamed glass panel 32 (stainless fiber 38) can absorb electromagnetic waves that arrive at the conductive material 14. Further, the foam glass panel 32 can absorb the electromagnetic wave reflected by the conductive material 14, and when the electromagnetic wave is reflected by another member and arrives at the conductive material 14 again, the foam glass panel 32 receives the electromagnetic wave. Can be absorbed. Thereby, electromagnetic waves can be shielded more effectively.

(Second embodiment)
FIG. 14 is a sectional view showing an installation state of the electromagnetic wave shielding structure 10 according to the second embodiment.

  The electromagnetic wave shielding structure 10 according to the second embodiment is applied to each side surface of the rectangular box-shaped electromagnetic wave shielding chamber 46, and each electromagnetic wave shielding chamber 46 has a rectangular board shape functioning as the core material 12 on each side surface. A plurality of (for example, two) wall plates 48 are arranged in the horizontal direction. The conductive material 14 is affixed to the wall plate 48, the conductive portion 16 is affixed to the back surface of the wall plate 48, and the facing portion 18 is affixed to the entire small edge of the wall plate 48. ing. Further, a gap 20 is formed between the facing portions 18 facing each other. Further, a wireless LAN device 50 is installed in the electromagnetic wave shielding chamber 46, and the wireless LAN device 50 can transmit electromagnetic waves (having a frequency of 2.4 GHz to 2.5 GHz).

  A rectangular parallelepiped box-shaped non-electromagnetic wave shielding chamber 52 is provided next to the electromagnetic wave shielding chamber 46, and one side surface of the non-electromagnetic wave shielding chamber 52 is shared with one side surface of the electromagnetic wave shielding chamber 46 and non-electromagnetic waves. The other side surface of the shield chamber 52 has a configuration to which the electromagnetic wave shield structure 10 is not applied.

  Here, in the electromagnetic wave shield structure 10 according to the second embodiment, electromagnetic waves transmitted from the wireless LAN device 50 in the electromagnetic wave shield room 46 are effectively reduced from leaking from the gap 20 to the non-electromagnetic wave shield room 52 and the like. can do. For this reason, the electromagnetic wave transmitted from the wireless LAN device 50 reaches the wireless information communication device in the non-electromagnetic wave shield room 52 and causes the wireless information communication device to malfunction, or the communication speed of the wireless information communication device is low. It can prevent that it falls extremely. In addition, information transmitted from the wireless LAN device 50 can be prevented from leaking.

  Furthermore, when the wall plate 48 is made of a material having electromagnetic wave absorption performance, when the electromagnetic wave transmitted from the wireless LAN device 50 arrives at the conductive material 14 and is reflected by the conductive material 14, Absorbed by wall plate 48. In addition, since the electromagnetic wave shielding structure 10 is applied to each side surface of the electromagnetic wave shielding chamber 46, there are an infinite number of electromagnetic wave reflection paths. For this reason, every time the electromagnetic wave transmitted from the wireless LAN device 50 is reflected by the conductive material 14, the electric field strength decreases, and the electric field strength of the electromagnetic wave that arrives at the gap 20 is reflected by the conductive material 14. The smaller the number, the smaller. Thereby, compared with the case where the wall plate 48 is made of a material having no electromagnetic wave absorption performance such as a plaster board, the electric field strength of electromagnetic waves leaking from the gap 20 to the non-electromagnetic shielding chamber 52 and the like can be further reduced. The electromagnetic wave shielding effect can be further improved.

(Third embodiment)
FIG. 15A is a sectional view showing the installation state of the electromagnetic wave shielding structure 10 according to the third embodiment.

  The electromagnetic wave shielding structure 10 according to the third embodiment is applied to the system ceiling. An upper floor slab 54 (floor) is disposed above the system ceiling, and a predetermined number of metal hanging hardware 56 are suspended from the slab 54. The suspension fitting 56 includes a plurality of suspension rods 58 and a grid-like or long plate-like frame plate 60. The upper ends of the suspension rods 58 are fixed to the slab 54, and the frame plate 60 is The frame plate 60 is supported by the slab 54 via a plurality of suspension bars 58 by being fixed to the lower ends of the suspension bars 58.

  Each component 62 in the electromagnetic wave shield structure 10 has a rectangular board-like ceiling plate 64 that functions as the core member 12. The conductive material 14 is attached to the wall plate 48, the conductive portion 16 is attached to the back surface (upper surface) of the ceiling plate 64, and the facing portion 18 is attached to the entire small edge of the ceiling plate 64. It is attached. Each component member 62 is supported by the frame plate 60 at all or both ends by a drop operation from above the frame plate 60, whereby the plurality of component members 62 are arranged side by side. A gap 20 is formed between the facing portions 18 that face each other, and the conductive material 14 and the suspension fitting 56 are electrically connected to each other by an oxide film or other treatment on the surfaces of the conductive material 14 and the suspension fitting 56. It is a configuration that is not done.

  Here, in the electromagnetic wave shielding structure 10 according to the third embodiment, even when electromagnetic waves arrive from above or below the system ceiling, leakage of electromagnetic waves from the gap 20 can be effectively reduced.

  FIG. 15B is a cross-sectional view showing the installation state of the electromagnetic wave shielding structure 10 according to a modification of the third embodiment.

  In the electromagnetic wave shielding structure 10 according to the modified example of the third embodiment, each opposing portion 18 extends upward (on the conductive portion 16 side of the ceiling plate 64), so that the width and area of the opposing surface of each opposing portion 18 are increased. It has been enlarged. Thereby, from the above formula (1), the facing area S between the facing portion 18 and the facing portion 18 facing each other is increased, the impedance of the capacitor is decreased, and the electromagnetic wave shielding performance of the gap 20 can be further improved.

(Fourth embodiment)
FIG. 16 is a front view showing an installation state of the electromagnetic wave shielding structure 10 according to the fourth embodiment. Further, FIG. 17A shows a cross-sectional view taken along the line AA of FIG. 16, FIG. 17B shows a cross-sectional view taken along the line BB of FIG. 16, and FIG. FIG. 16 is a sectional view taken along the line CC of FIG.

  The electromagnetic wave shielding structure 10 according to the fourth embodiment is applied to a door portion. The door portion includes a floor 66 that functions as the core material 12 and a door frame 68 (wall) that functions as the core material 12. The door frame 68 is erected on the floor 66, and the door frame. A partition wall 70 is fixed on the indoor side of 68. A rectangular opening 72 is formed through the door frame 68, and the lower surface of the opening 72 is formed by a floor 66. A rectangular opening 74 is also formed through the partition wall 70, and the opening 74 communicates with the opening 72, and the peripheral edge thereof is disposed inside the peripheral edge of the opening 72.

  The door frame 68 is affixed with a sheet-like or plate-like conductive material 14 made of aluminum or the like, and the outer surface of the door frame 68 (which may be inside the door frame 68) is electrically conductive. While the part 16 is affixed, the opposing part 18 is affixed to the whole of all the small openings in the opening 72 of the door frame 68. The partition wall 70 is also provided with a conductive material (not shown), and the conductive material 14 of the door frame 68 is conducted to this conductive material. A facing portion 18 (second facing member) in the form of a sheet or plate made of aluminum or the like is installed at a portion (shoe rubbing portion) that forms the lower surface of the opening 72 of the floor 66. The conductive material of the partition wall 70 is electrically connected. Note that the facing portion 18 of the floor 66 may be laid under the floor finishing material.

  A rectangular panel-like door panel 76 that functions as the core member 12 is provided in the opening 72. The door panel 76 has a sheet-like or plate-like conductive material 14 made of aluminum or the like attached thereto. The conductive portion 16 is attached to the outside surface of the door panel 76, and the door frame 68 has a The facing portion 18 is affixed to the entirety of all the small openings in the opening 72. The door panel 76 is attached to the opposite side 18 on one side of the opening 72 of the door frame 68 at the opposite side 18 on one side via a predetermined number (for example, two) of hinges 78. Thus, the door panel 76 can be rotated and the opening 72 can be opened and closed. A door knob 80 is attached to the conductive portion 16 on the outdoor side surface of the door panel 76 and the indoor side surface.

  The conductive material 14 of the door frame 68 and the conductive material 14 of the door panel 76 are not conducted by a predetermined treatment regardless of a predetermined number of hinges 78 or the like. Further, a gap 20 is formed between the facing portion 18 of the door frame 68 and the floor 66 and the facing portion 18 of the door panel 76.

  Here, in the electromagnetic wave shielding structure 10 according to the fourth embodiment, even when electromagnetic waves arrive from the indoor side or the outdoor side, leakage of the electromagnetic waves from the gap 20 can be effectively reduced.

(5th Example)
FIGS. 18A and 18B are sectional views showing the installation state of the electromagnetic wave shielding structure 10 according to the fifth embodiment.

  The electromagnetic wave shielding structure 10 according to the fifth embodiment is applied to a wall, floor, ceiling, window, or the like constituting a room in which a wireless device such as a wireless LAN device is used. As shown in FIG. 18 (A), each component 82 of the electromagnetic wave shield structure 10 has a core material 12 in a board shape having a parallelogram cross section. A conductive material 14 is affixed to the core material 12, and a conductive portion 16 is affixed to the front surface and the back surface of the core material 12, and a facing portion 18 is inclined to the entire small edge of the core material 12. It is pasted in the state. The plurality of component members 82 are aligned in parallel with the inclined facing portions 18 of the core member 12 facing each other, and a gap 20 is formed between a pair of facing portions 18 facing each other. Yes.

  As shown in FIG. 18B, a part of the constituent members 82 can be rotated (moved), whereby the arrangement of the plurality of constituent members 82 is released and the opening 84 can be formed. It is.

  Here, in the electromagnetic wave shielding structure 10 according to the fifth example, the plurality of constituent members 82 are aligned in parallel, so that leakage of electromagnetic waves from the gap 20 is effectively reduced and the electromagnetic wave shielding function is activated. The On the other hand, when a part of the constituent members 82 is rotated, the opening 84 is formed and the electromagnetic wave shielding function is released. For this reason, when you want to avoid communication by radio equipment in the room and outdoors, you can activate the electromagnetic shielding function, while when you want to communicate by radio equipment in the room and outdoors, The electromagnetic wave shielding function can be canceled. As a result, the wireless communication status can be controlled.

  Further, in each component member 82, the facing portion 18 is disposed non-perpendicular to the conductive portion 16. For this reason, the facing area of the pair of facing portions 18 facing each other can be effectively increased, and the impedance of the capacitor formed by the pair of facing portions 18 facing each other can be reduced from the above formula (1). Thus, the electromagnetic shielding performance of the gap 20 can be further improved.

  FIGS. 19A and 19B are sectional views showing the installation state of the electromagnetic wave shielding structure 10 according to the modification of the fifth embodiment.

  As shown in FIG. 19A, each constituent member 86 of the electromagnetic wave shielding structure 10 according to the modification of the fifth embodiment has a core member 12 having a board shape with a rectangular cross section. A conductive material 14 is affixed to the core material 12, and a conductive portion 16 is affixed to the front surface and the back surface of the core material 12, and a facing portion 18 is affixed to the entirety of all the small openings of the core material 12. It has been. The opposing portion 18 of the fore edge on one side of the core material 12 has a convex shape in cross section, and the opposing portion 18 of the fore edge on the other side of the core material 12 has a concave shape in cross section. The plurality of component members 86 are close to each other in a state in which the opposed portion 18 having a convex cross section is inserted into the opposed portion 18 having a concave cross section and is opposed to each other, and a gap 20 is formed between the pair of opposed portions 18 facing each other. Is formed.

  As shown in FIG. 19B, some of the constituent members 86 can be slid (moved), whereby the plurality of constituent members 86 can be separated to form the opening 88. .

  Here, in the electromagnetic wave shielding structure 10 according to the modified example of the fifth embodiment, the leakage of the electromagnetic wave from the gap 20 is effectively reduced and the electromagnetic wave shielding function is activated by approaching the plurality of constituent members 86. Is done. On the other hand, when a part of the constituent members 86 is slid, an opening 88 is formed and the electromagnetic wave shielding function is released. For this reason, when you want to avoid communication by radio equipment in the room and outdoors, you can activate the electromagnetic shielding function, while when you want to communicate by radio equipment in the room and outdoors, The electromagnetic wave shielding function can be canceled. Thereby, the wireless communication status can be controlled.

  Further, in each component member 86, the facing portion 18 has a convex cross section or a concave cross section. For this reason, the facing area of the pair of facing portions 18 facing each other can be effectively increased, and the impedance of the capacitor formed by the pair of facing portions 18 facing each other can be reduced from the above formula (1). Thus, the electromagnetic shielding performance of the gap 20 can be further improved.

(Sixth embodiment)
FIG. 20 is a sectional view showing an installation state of the electromagnetic wave shielding structure 10 according to the sixth embodiment.

  The electromagnetic wave shielding structure 10 according to the sixth embodiment is applied to a window portion. The window portion has an aluminum frame-like sash 90, and each frame portion inner peripheral wall of the sash 90 serves as a facing portion 18 (second facing member), and a concave portion is formed in the facing portion 18. . In each frame portion of the sash 90, a plate-like glass 92 that functions as the core member 12 is fitted, and an end portion of the glass 92 is inserted into a recess of the sash 90 facing portion 18.

  The core material 12 is provided with a conductive material 14. Inside the glass 92 (which may be the front or back surface of the door frame 68), a film-like conductive portion 16 is provided, and the conductive portion 16 is a metal vapor deposition film, a metal printed film, or the like. A facing portion 18 having a U-shaped cross section is attached to the entire fore edge of the glass 92 and the vicinity thereof, and the facing portion 18 is fitted into a recess of the sash 90 facing portion 18.

  Since the oxide film is usually formed on the sash 90 and the facing portion 18 of the glass 92, the sash 90 and the conductive material 14 of the glass 92 are not electrically connected to each other. A gap 20 is formed between the facing portion 18 of the glass 92 by an oxide film.

  Here, in the electromagnetic wave shielding structure 10 according to the sixth example, even when electromagnetic waves arrive from the indoor side or the outdoor side, leakage of the electromagnetic waves from the gap 20 can be effectively reduced.

  Further, unlike the conventional case, it is possible to completely eliminate the removal of the oxide film from the facing portion 18 of the sash 90 and the facing portion 18 of the glass 92.

  Moreover, since the oxide film which exists between the recessed part of the sash 90 opposing part 18 and the opposing part 18 of the glass 92 acts as dielectrics other than air, a pair of opposing part which mutually opposes from said Formula (1). The impedance of the capacitor constituted by 18 can be reduced, and the electromagnetic wave shielding performance of the gap 20 can be further improved.

  In addition, the recess of the sash 90 facing portion 18 is formed, and the facing portion 18 of the glass 92 has a U-shaped cross section. For this reason, the facing area of the pair of facing portions 18 facing each other can be effectively increased, and the impedance of the capacitor formed by the pair of facing portions 18 facing each other can be reduced from the above formula (1). Thus, the electromagnetic shielding performance of the gap 20 can be further improved.

It is sectional drawing which shows the basic structure of the electromagnetic wave shield structure which concerns on embodiment of this invention. It is sectional drawing which shows the basic structure of the electromagnetic wave shield structure which concerns on a comparative example. (A) is the schematic which shows the basic structure and circuit structure of the electromagnetic wave shield structure which concern on a comparative example, (B) is the schematic which shows the basic structure and circuit structure of the electromagnetic wave shield structure which concerns on embodiment of this invention. FIG. (A) thru | or (F) is sectional drawing which shows the modification of the structural member of the electromagnetic wave shield structure which concerns on embodiment of this invention. (A) thru | or (C) are sectional drawings which show the modification of the electromagnetic wave shield structure which concerns on embodiment of this invention. It is a graph which shows the relationship between the frequency of the electromagnetic wave which arrives in the electromagnetic wave shield structure which concerns on a comparative example, and the electromagnetic wave shielding performance of a clearance gap. (A) And (B) is a graph which shows the experimental result about communication of wireless LAN indoor, (A) is a graph which shows the relationship between the distance from a transmission antenna, and the electric field strength of electromagnetic waves, (B) is a graph showing the relationship between the distance from the transmitting antenna to the receiving antenna and the communication speed of electromagnetic waves. FIG. 8 is a graph showing the experimental results of the relationship between the frequency of the incoming electromagnetic wave and the electromagnetic wave shielding performance of the gap in the electromagnetic wave shielding structure according to the comparative example and the electromagnetic wave shielding structure according to the embodiment of the present invention. ) Is a case where the gap interval is 1 mm, and (B) is a case where the gap interval is 4 mm. 6 is a graph showing experimental results of the relationship between the gap interval and the electromagnetic shielding performance of the gap when a dielectric having a dielectric constant of 1.0 F / m is inserted into the gap in the electromagnetic wave shield structure according to the embodiment of the present invention. Yes, (A) is the case where the frequency of the incoming electromagnetic wave is set to 2.45 GHz, and (B) is the case where the frequency of the incoming electromagnetic wave is set to 5.2 GHz. 6 is a graph showing an experimental result of a relationship between a gap interval and a gap electromagnetic shielding performance when a dielectric having a dielectric constant of 4.0 F / m is inserted into the gap in the electromagnetic wave shield structure according to the embodiment of the present invention. Yes, (A) is the case where the frequency of the incoming electromagnetic wave is set to 2.45 GHz, and (B) is the case where the frequency of the incoming electromagnetic wave is set to 5.2 GHz. It is a table | surface which shows the space | interval of the clearance gap which can ensure the electromagnetic wave shielding performance of the clearance gap of 30 dB or more. It is a graph which shows the border line which satisfies the electromagnetic wave shielding performance of the clearance gap of 30 dB or more in relation with the thickness of a core material, and the space | interval of a clearance gap. (A) is a perspective view which shows the structural member of the electromagnetic wave shield structure which concerns on 1st Example, (B) is sectional drawing which shows the installation condition of the electromagnetic wave shield structure which concerns on 1st Example. It is sectional drawing which shows the installation condition of the electromagnetic wave shield structure which concerns on 2nd Example. (A) is sectional drawing which shows the installation condition of the electromagnetic wave shield structure which concerns on 3rd Example, (B) is sectional drawing which shows the installation condition of the electromagnetic wave shield structure which concerns on the modification of 3rd Example. . It is a front view which shows the installation condition of the electromagnetic wave shield structure which concerns on 4th Example. (A) is the sectional view on the AA line of FIG. 16, (B) is the sectional view on the BB line of FIG. 16, (C) is the sectional view on the CC line of FIG. . (A) And (B) is sectional drawing which shows the installation condition of the electromagnetic wave shield structure which concerns on 5th Example. (A) And (B) is sectional drawing which shows the installation condition of the electromagnetic wave shield structure which concerns on the modification of 5th Example. It is sectional drawing which shows the installation condition of the electromagnetic wave shield structure which concerns on 6th Example.

Explanation of symbols

10 Electromagnetic wave shield structure 12 Core material (mounting member)
16 Conductive part (first conductive member, second conductive member)
18 Opposing portions (first opposing member, second opposing member)
24 Spacer 26 Dielectric 28 Soft material 32 Foamed glass panel (mounting member)
44 Sealing agent (dielectric)
48 Wall plate (Mounting member)
64 Ceiling panel (mounting member)
66 Floor (Mounting member)
68 Door frame (mounting member)
76 Door panel (mounting member)
92 Glass (Mounting member)

Claims (13)

A first conductive member having conductivity;
A first opposing member having electrical conductivity and being conducted to the first conductive member in a state of being non-parallel to the first conductive member or being bent with respect to the first conductive member;
A second opposing member that is electrically conductive and is disposed on a side of the first conductive member in a state that is not conducted to the first conductive member and the first opposing member, and that faces the first opposing member;
Electromagnetic shield structure with   The second opposing member has conductivity and is not electrically connected to the first conductive member and the first opposing member and is not parallel to the second opposing member or bent with respect to the second opposing member. The electromagnetic shielding structure according to claim 1, further comprising a second conductive member conducted to the member.   The electromagnetic wave shielding structure according to claim 1, wherein the first opposing member and the second opposing member are arranged substantially parallel to each other.   The electromagnetic wave shielding structure according to any one of claims 1 to 3, wherein a dielectric is provided between the first opposing member and the second opposing member.   5. The electromagnetic wave shielding structure according to claim 1, wherein a loss material for losing electromagnetic waves is provided between the first opposing member and the second opposing member.   At least one of the thickness of the first opposing member, the thickness of the second opposing member, and the distance between the first opposing member and the second opposing member is ¼ or less of the wavelength of the electromagnetic wave to be shielded. The electromagnetic wave shielding structure according to any one of claims 1 to 5, wherein   7. The apparatus according to claim 1, further comprising: a plurality of attachment members each having electromagnetic wave absorption performance, to which the first conductive member and the second opposing member are respectively attached. Electromagnetic shielding structure.   The electromagnetic wave shielding structure according to claim 7, wherein at least a part of the mounting member is made of a soft material.   9. The electromagnetic wave shielding structure according to claim 1, wherein at least one of the first opposing member and the second opposing member is arranged non-perpendicular to the first conductive member.   10. The electromagnetic wave shielding structure according to claim 1, wherein at least one of the first opposing member and the second opposing member is provided with a concave portion or a convex portion.   11. The electromagnetic wave shielding structure according to claim 1, wherein a spacer having a predetermined length is sandwiched between the first opposing member and the second opposing member.   The electromagnetic shielding structure according to any one of claims 1 to 11, wherein at least one of the first conductive member, the first opposing member, and the second opposing member is movable.   The width of the facing surface of the first facing member to the second facing member and the facing surface of the second facing member to the first facing member is set to 20 mm or more, and the first facing member and the second facing surface The electromagnetic wave shielding structure according to any one of claims 1 to 12, wherein an interval between the members is 20 mm or less.

Images