JP2000232298A - Shield panel assembly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide shielding panels and assemblies thereof for a shield room, where a room can be effectively and easily shielded from magnetic fields and radio-waves through an easy construction work. SOLUTION: A thick platelike panel body 11 which is of honeycomb structure and formed of lightweight member is provided, and a magnetic shield plate 12 and a radio-wave shield plate 13 are laminated on each surface of the panel body 11 for the formation of a shield room shield panel 4. The shield room shield panels 4 are arranged on the same plane and connected together with connecting members 2 and 3 for the formation of a shield room panel assembly 1, where the connecting members 2 and 3 are formed of conductive magnetic flat member and arranged on the shield panels 4 along a butted part between the shield panels 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield panel for a magnetic / radio shield room and an assembly thereof, and more particularly to a magnetic / radio shield for both a magnetic shield and a radio shield.
The present invention relates to a shield panel for an electromagnetic wave shield room and an assembly thereof.

[0002]

2. Description of the Related Art Conventionally, shield rooms for radio waves have been
It has been used more frequently than ever before for use as experimental equipment for radio waves and to suppress radio interference caused to peripheral devices when various electronic devices are prototyped.

[0003] On the other hand, various electronic devices using strong magnets, such as magnetic resonance image diagnostic devices (MRI devices), have been commercialized in response to recent social demands. This MRI apparatus is for photographing a cross-sectional image of a human body.
2,000 Gauss) to 2 Tesla for a predetermined time, and at the same time, the space around the outside
It is exposed to a strong magnetic field from the I device.

For this reason, if this is left unattended, even if a magnetic field of about 10 gauss is generated due to, for example, magnetic leakage to the surroundings, the surrounding precision electronic equipment malfunctions. When walking near the MRI apparatus during operation, there is a great danger that the pacemaker easily malfunctions.

In the above-mentioned MRI apparatus, a weak electromagnetic wave generated in the human body by magnetic resonance is accurately measured and imaged. Therefore, a radio wave shield room for strictly shielding external radio waves is provided for the entire apparatus (or a part thereof).

FIG. 15 shows an example (schematic cross-sectional view) of a shield room 500 generally known conventionally. In the conventional example shown in FIG. 15, a magnetic shield plate 101 is provided around the MRI apparatus 100 first. The magnetic shield plate 101 is held by, for example, four columns 201. Further, on the outer periphery of the magnetic shield plate 101, a radio wave shield plate is provided so as to overlap with the magnetic shield plate 101 (or with a predetermined gap therebetween).

[0007] Here, reference numeral 103 indicates an interior cross portion, and reference numeral 104 indicates an opening / closing door. This opening / closing door 104
Also, a magnetic shield and a radio shield are provided. The same magnetic shield and radio wave shield are applied to the floor and the ceiling.

[0008]

However, in the above-mentioned conventional example, a column is required to provide the magnetic shield and the radio wave shield, and the magnetic shield plate and the radio wave shield plate must be separately constructed. However, there is an inconvenience that the operation becomes complicated. In addition, prop 201
Therefore, it is necessary to secure a predetermined occupied area for the construction, and the entire area of the shield room becomes unnecessarily large.

[0009] On the other hand, in recent years, a magnetic shield plate and a radio wave shield plate have been integrated. However, in many of these cases, the magnetic shield plate and the radio wave shield plate are simply superimposed, and therefore, in order to equip the magnetic shield plate and the radio wave shield plate, the same support column 201 as in the above-described conventional example is always required. Was. In addition, when the column 201 is not used and the column 201 is not used, it is usually necessary to provide a gap in the magnetic plate even at the expense of the magnetic shielding performance, since it is necessary to give priority to radio wave shielding. Was.

[0010]

An object of the present invention is to solve the disadvantages of the prior art and, in particular, to provide a shield panel for a magnetic and magnetic / radio wave shielded room which is simple in construction and can simultaneously and effectively perform a magnetic shield and a radio wave shield. And an assembly thereof.

[0011]

In order to achieve the above object, in each of the inventions relating to the shield panel for a shield room according to any one of claims 1 to 5, a honeycomb structure made of a lightweight member is provided to facilitate workability. It has a thick panel body. A common basic configuration is that a magnetic shield plate and a radio wave shield plate are respectively laminated on both surfaces of the panel body.

For this reason, in each of the first to fifth aspects of the present invention, the magnetic shield plate and the radio wave shield plate are respectively provided with the panel body interposed therebetween and have a double structure as a whole. When the shield room is formed in this manner, it is possible to perform a magnetic shield and a radio wave shield with extremely excellent performance inside and outside the shield room.

Further, since the shield panel itself is formed in a thick plate shape with the lightweight panel body interposed therebetween, the shield panel itself can be self-supported. Can be eliminated, and construction work for the facility can be performed efficiently.

Here, the thick plate-shaped panel main body having the above-mentioned honeycomb structure may be formed using paper which is an electrically insulating material. This makes it possible to obtain a light-weight, inexpensive, and strong panel main body, and at the same time, the magnetic shield plate and the radio wave shield plate are laminated on both sides, so that the effects of the magnetic shield and the radio wave shield can be doubled. . Further, the above-mentioned magnetic shield plate is preferably laminated on the inside of the radio wave shield plate. In this case, when the magnetic shield plate is formed by laminating a plurality of thin magnetic plates and disposing the laminated plate on both sides of the honeycomb material, the shielding effect can be further enhanced.

Further, the magnetic shield plate may be formed of a magnetic member such as a silicon steel plate or a permalloy plate, and the radio wave shield plate may be formed of a good conductive member such as copper or aluminum. Furthermore, as a material of the above-mentioned radio wave shield plate,
It is preferable to use a zinc-coated iron plate. In this case, zinc is an electrically good conductor and can reduce the contact resistance when connected.At the same time, since the base iron plate is a magnetic material, it is possible to improve the performance of the radio wave shield and the performance of the magnetic shield. it can.

According to each of the inventions relating to the shield room panel assembly according to claims 6 to 9, a shield room panel assembly including a plurality of shield panels arranged on the same surface and connected by a connecting member. In addition, the above-mentioned shield panel has a honeycomb structure made of a lightweight member and a panel body formed in a thick plate shape, and a magnetic shield plate and a radio wave shield plate respectively laminated on both sides of the panel body. And

Further, the above-mentioned connecting member is formed of a flat plate-like member and is disposed along the abutting portion of each shield panel so as to cover the abutting portion of each shield panel. Each of the connecting members described above is formed of a magnetic member having conductivity.

For this reason, in each of the inventions according to the sixth to ninth aspects, when connecting the shield panel using the connecting member, the above-described connecting member is provided so as to cover the connecting portion. It is possible to adjust the gap by providing a gap between the shield panels, so that the assembly adjustment at the site can be performed smoothly, and therefore, the assembly work of the shield room can be performed efficiently, and Since the construction of the magnetic shield and the radio wave shield can be performed at once, the construction can be completed quickly and reliably.

Here, the above-mentioned connecting member may be formed of a strip-shaped long member or a long member having a U-shaped cross section. In this case, by mounting one piece on each surface of the connecting portion, one and the other shield room panels can be connected, and workability can be improved, which is convenient.

Further, the above-mentioned connecting member may be formed of an iron plate coated with zinc. In this manner, the contact resistance (electrical) between the panels in the entire shield room panel assembly is reduced, and the electrical resistance is reduced even for the entire assembled panel. It is convenient because the radio wave shielding effect can be enhanced.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment A first embodiment of the present invention will be described below with reference to FIGS. First, in FIGS. 1 to 3, reference numeral 1 denotes a panel assembly for a shield room. As shown in FIG. 1, this shield room panel assembly 1 includes a plurality of shield panels 4, 4... Having the same structure, which are arranged on the same surface and connected by connecting members 2, 3. I have. FIG.
FIG. 2 shows a part of a front view as seen from the direction of arrow K in FIG. 1.

FIG. 4 shows a shield room 10 formed by using the shield room panel assembly 1.
In the shield room 10, a medical MRI apparatus 1 is provided.
00 is arranged. Further, reference numeral 10A denotes a shield door having each shield function of a radio wave shield and a magnetic shield as described later.

In this case, a predetermined interval S is provided at the butted portion of the above-mentioned shield panels 4 constituting the panel assembly 1 for the shield room 10 as shown in FIG. This interval S is set to an arbitrary size. Then, an assembly error generated when assembling the shield room can be absorbed by the interval S. Therefore, in assembling the shield room, special skill is not required, and the work efficiency can be further improved.

Each of the shield panels 4 described above is, for example,
A panel body 11 formed of a lightweight member having a honeycomb structure made of paper or the like and having a thick plate shape, and a magnetic shield plate 12 having a predetermined thickness laminated on both sides of the panel body 11
And a radio wave shield plate 13.

Here, as the magnetic shield plate 12, for example, a laminate of silicon steel plates having a thickness of 0.35 [mm] is used. In addition, radio wave shield plate 13
The thickness is 0.8 [m] in which one or the other surface or both surfaces are coated with electrically good zinc.
m] is used. Further, the radio wave shield plate 13 is laminated outside the above-described magnetic shield plate 12.

That is, each shield panel 4 has a magnetic shield plate 12 on both sides of the panel body 11 and an inner side.
, And a radio wave shield plate 13 on the outside. Here, the radio wave shield plate 13 may be formed using copper or aluminum as a material. The thicknesses of the magnetic shield plate 12 and the radio wave shield plate 13 may be other than those described above. Also, this radio wave shield plate 13
Alternatively, the end of the shield panel 4 may be bent toward the end face of the panel body 11 as shown in FIG.

As described above, in the shield panel 4, the magnetic shield plate 12 and the radio wave shield plate 13 are respectively overlapped with the panel body 11 interposed therebetween, and the whole has a double structure on both sides. Since the magnetic shield plate 12 is also multiplexed on one side and the other side (a plurality of sheets are stacked), if this is used to form a shield room, the magnetic shield and the radio wave shield are simultaneously and extremely effective. There is an advantage that it can be executed reliably.

Further, since the shield panel 4 itself is formed in a thick plate shape, the shield panel 4 itself can be self-sustained. Therefore, when the shield room 10 is formed, a support column is not required, and facilities are required. Not only can the construction work be performed efficiently, but also the area occupied by the outer wall portion of the shield room 10 is reduced accordingly.
The effective area of the shield room 10 can be widened, the construction work for the facility can be performed efficiently, and the construction of the magnetic shield and the radio wave shield can be performed at the same time. There is an advantage that it can surely be achieved.

In the present embodiment, the connecting members 2 and 3 are formed of a long plate-like member having a U-shaped cross section. As shown in FIG. 1, the connecting members 2 and 3 cover the butted portions (spaces S) of the shield panels 4 arranged on the same surface from both sides (from inside and outside). The shield panels 4 are mounted on both sides of the butted portion of the shield panel 4.

Reference numerals 2A and 3A denote outer projecting portions provided at both ends of the outer connecting member 2 and the inner connecting member 3, respectively. The outer protrusions 2A, 3A are connected to the respective connecting members 2,
3 for enhancing the strength, and is formed by bending each side end.

The connecting members 2 and 3 are formed of a conductive magnetic member such as a steel plate. Specifically, a steel sheet coated with zinc (Zn) on both sides is used. For this reason, when viewed from the inside of the shield room, a continuous magnetic circuit is formed by the connecting members 2 and 3 at the butted portion of the shield panel 4, and since the connecting members 2 and 3 are also conductive members, radio wave shielding is performed. In such a point, the magnetic shield and the radio wave shield at the connection portion form a double wall surface, and the performance is reliably maintained.

The connection of the shield panels 4 by the connecting members 2 and 3 is performed by bolts 5A and 5B. As shown in FIGS. 1 and 2, in this embodiment, the other connecting member 3 located inside is provided with the bolts 5 </ b> A,
Screw holes 3a and 3b for 5B are provided. The screw holes 3a and 3b are formed in a drawn hole portion formed by drawing a part of the connecting member 3 described above. Here, the screw holes 3a and 3b may be formed by welding nuts instead.

Each of the connecting members 2 and 3 has a ridge 2 at each end thereof.
A and 3A are disposed in a state of protruding outward (that is, each flat portion is in contact with the outer surface of the end of each shield panel 4) so as to connect the ends of the respective shield panels 4. Has become. The bolts 5A, 5B, the panel body 11, the magnetic shield 12, and the radio wave shield 13 laminated on both sides of the panel are penetrated toward the screw holes 3a, 3b. The members 2 and 3 are connected.

As described above, in the present embodiment, the predetermined gap S is provided between the butted portions of the shield panel 4 described above, and the projecting portions 2A are formed on both sides of the gap S to the outside.
(Or 3A) are disposed so as to cover the gap S by connecting members 2 and 3 having a U-shaped cross section, and the one and the other connecting members 2 and 3 are connected by bolting across the panel body 11. It has become.

For this reason, the connecting operation is performed by the bolt 5
Since the shield panels 4 are connected to each other by A and 5B, there is an advantage that the shield room can be easily and quickly assembled on site.

Here, in the above-described embodiment, the case where the connecting member 2 is formed of a long plate-shaped member having a U-shaped cross section is exemplified. It may be formed. Alternatively, it may be a shape having an inverted U-shaped cross section and a fixing mounting portion extending outward at both ends. Reference numeral 15 denotes an interior board and an interior cross portion. The interior board and the cross portion are fixed by interior fittings attached to the radio wave shield plate 13 (not shown). Furthermore,
In FIG. 2, reference numeral 16 denotes a floor-side shield member.

Also, FIGS. 1 and 2 show an example in which a gap S of an arbitrary size is provided at the abutting portion of each shield panel 4, but this gap S is not particularly provided, and Alternatively, a panel having a predetermined width may be prepared and replaced with this.

FIG. 3 is a partial cross-sectional view showing the structure of the corner area of the shield room. The corner area shown in FIG. 3 shows a structure for connecting the panel assemblies 1 which are in contact at right angles to each other. Reference numeral 21 denotes an outer connecting member, and reference numeral 22 denotes an inner connecting member.

In this case, in FIG. 3, the end face of the shield panel 4 located on the lower side in FIG. 1 abuts on the side face of the end of the shield panel 4 located on the upper side in the figure. And the other end of each panel assembly 1 is in contact with each other at right angles.

The above-described outer connecting member 21 and inner connecting member 22 form a part of the corner area, and are sandwiched between the connecting members 21 and 22 to connect the one and the other panel assemblies 1. (A corner area of the shield room).

Here, the shield panel 4 located on the upper side in FIG. 3 is provided with a portion sandwiched between the outer connecting member 21 and the inner connecting member 22 so as to pass through the panel main body 2 from the inner connecting member 22. First, the inner connecting member 22 and the outer connecting member 21 are integrally connected by a bolt 5A screwed into a screw hole 21a formed in the outer connecting member 21 formed.

On the other hand, the shield panel 4 located on the lower side in FIG.
Are provided so as to penetrate from the outer connecting member 21 to the panel main body 2 and the inner connecting member 22, and are integrally connected to the outer connecting member 21 and the inner connecting member 22 by bolts 5B.

As a result, the connecting portion (corner region of the shield room) between the above-mentioned one and the other panel assemblies 1 is formed. Here, the outer connecting member 21 and the inner connecting member 22 are both made of the same material as that of the above-described connecting member 2 and processed in the same manner (the surface is coated with zinc).
Reference numerals 21A and 22A denote outer connecting members 21 respectively.
And the outer protruding portions (protruding portions) provided at both ends of the inner connecting member 22. These outer protrusions 21A and 22A are
It is for strengthening the strength of each connecting member 21, 22.
Each side end is formed by bending.

For this reason, the connecting portion (the corner area of the shield room 10) of the one and the other panel assemblies 1 is also
The connection between the shield panels 4 in each of the panel assemblies 1 is performed under exactly the same magnetic and electrical conditions, and in this regard, the connection portion (the corner area of the shield room 10) is also excellent. A simple magnetic shield and a radio wave shield can be realized.

Here, in FIG.
Denotes an interior cloth, and reference numeral 10A denotes an opening / closing door.
The opening and closing door 10A is also provided with a magnetic shield and a radio wave shield substantially similar to the shield panel 4 in FIG.

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

First, in FIG. 4, when the MRI apparatus 100 is operated, a strong magnetic field is generated around the MRI apparatus 100. On the other hand, each panel 4 constituting the shield room 1 shields the magnetic shield plate 12 in two stages because the magnetic shield plate 12 is provided inside and outside the shield room 1, and the leakage magnetic field strength to the outside is reduced. Is reduced to such an extent that it does not adversely affect the outside. For this reason, even if a patient having a pacemaker or the like walks on the side of the shield room 1, no inconvenience is given to the operation of the pacemaker.

On the other hand, the MRI apparatus 100 is used to capture a weak magnetic resonance signal derived from the human body and output to the outside. As a result, the formation of an MR image is hindered. On the other hand, as described above, the shield room 1
Each panel 4 is provided with the radio wave shield plate 13 inside and outside the shield room 1, so that it shields the radio wave shield plate in two stages as in the case of the magnetic shield, and almost all radio waves arriving from the outside. Completely shielded. Therefore, there is no adverse effect on the image formation of the internal MRI apparatus 100.

As described above, when the shield room 1 having the two shielding functions of the magnetic shield and the radio wave shield is formed, by using the above-described shield panel 4 or the panel assembly 1, the occupied area of the MRI imaging room is reduced. It is possible to obtain a shield room 1 that can be formed somewhat wider than the conventional one, and at the same time, has an enhanced shielding effect and can perform assembly work quickly.

[Second Embodiment] Next, a second embodiment will be described with reference to FIGS. In the second embodiment shown in FIGS. 5 and 6, the connecting members 32 and 33 equivalent to the U-shaped connecting members 2 and 3 provided in the first embodiment shown in FIG. Unlike the case of
As shown in FIG. 5, it is characterized in that it is mounted in the opposite direction. FIG. 6 shows a part of the front view as seen from the direction of arrow K in FIG.

As shown in FIG. 5, one of the connecting members 32, 33 is provided with a long member main body 32A having a U-shaped cross section and on both sides of the long member main body 32A. The protruding ridge portion 32a, the through hole 32Aa for bolting provided at a predetermined position of the long member main body 32A, and the inner surface side of the long member main body 32A described above is appropriately partitioned with the through hole 32Aa interposed therebetween. And a plurality of partition plates 32Ab that reinforce the strength of the long member main body 32A.

As shown in FIG. 6B, the other connecting member 33 has a long member main body 33A having a U-shaped cross section and ridges 33a provided on both sides of the long member main body 33A.
And a screw hole 33Aa for a bolt provided at a predetermined position of the long member main body 33A, and appropriately partitioning the inner surface side of the long member main body 32A described above with the screw hole 32Aa interposed therebetween. And a plurality of partition plates 33Ab that reinforce the strength. Here, the screw hole 32Aa of the other connecting member 33 is formed as a drawing hole.

Further, each partition plate 32Ab, 33Ab is
Both are integrally fixed to the elongated member main bodies 32A, 33A so as to cross the elongated member main bodies 32A, 33A inside. Therefore, the connecting members 32, 3
Even if 3 is equipped as shown in FIG. 5, one and the other shield panels 4, 4 can be effectively connected as in the case of FIG. Other configurations are the same as those of the embodiment of FIG. 1 described above.

In this case, when the connecting members 32 and 33 are connected to the shield panels 4 and 4 by bolts 5A and 5B, the connecting members 32 and 33 are provided on both sides of the elongated member main bodies 32A and 33A by the tightening force of the bolts 5A and 5B. The distal ends of the projected ridges 32a, 33a are strongly pressed against the radio wave shield plates 13, 13 on the front side of the shield panels 4, 4. As a result, the contact resistance at the relevant portion is reduced, and at this point, one and the other radio wave shield plates 13, which are laminated on the surface side of each shield panel 4, 4,
13 can reduce the electric resistance between them, and the effect of radio wave shielding by each radio wave shield plate 13 can be further enhanced. Other functions and effects are the same as those of the embodiment shown in FIG. 1 described above.

Next, the functions of the magnetic shield and the radio wave shield common to the above embodiments will be described in detail.

[Magnetic Shield] As a prerequisite for performing a magnetic shield (ie, a magnetic shield), at least a space that needs to be shielded must be closed by a magnetic material having a required thickness. Such a condition is that when there is a magnetic field source having a magnetic pole inside, even when it is desired to keep the magnetic field of the magnetic field source in the required space as much as possible, or when there is an external magnetic field source. This is a necessary condition even when it is desired to minimize the influence of the magnetic field in the required space.

This necessary condition is equivalent to forming a three-dimensional closed space magnetic path having a predetermined thickness in the required space. Therefore, the shielding performance depends on the magnitude of the magnetic resistance (reluctance) of the wall magnetic circuit forming the closed space.

Here, a rectangular case as shown in FIG. 7 (a) is assumed, which is made of a magnetic plate 12 'having a thickness t, and a magnetic field having a magnetic pole inside the case is generated. Consider the case where the source is placed. In this case, the theoretical background for suppressing the spread of the magnetic field by the magnetic field source as small as possible is examined. Now, as shown in FIG. 7B, the thickness of the wall magnetic material is t [m], the magnetic permeability is μ [H / m], and the cross-sectional area per unit length of the wall magnetic material is A. The length of the magnetic path is L0
Assuming that [m], R0 = L0 / (. Mu..A) = 1 / (. Mu..t) [H] ^-1 ... Here, H is indicated as Henry (unit). This R
0 is smaller as the magnetic permeability μ is larger, and the plate thickness t
The larger the is, the smaller it is. In other words, the shielding performance increases as the magnetic permeability of the magnetic material on the wall surface increases and the plate thickness t increases.

However, in general, when a magnetic shield chamber is formed, it is impossible to close the space with a continuous homogeneous magnetic wall having a constant thickness. That is, the magnetic plate 1
It is necessary to derive a seam for 2 '.

This seam increases the magnetic resistance, so that the magnetic flux leaks at the seam and the shielding performance deteriorates. For this reason, as shown in FIG. 8A, measures have been taken to prevent the magnetic resistance of the magnetic path from increasing by superposing the magnetic plates 12 ', as shown in FIG. 8A. However, such measures are
Although it is relatively easy to separately implement the radio wave shield and the magnetic shield, it is not easy to perform the radio wave and the magnetic shield by using a self-supporting wall panel having a thickness in which both are integrated.

Therefore, when radio waves and magnetic shielding are performed by this thick free-standing wall panel, the radio wave shielding function depends on the low contact resistance at the time of joining between the panels. I have to. For this reason, as shown in FIG. 1 described above, it is necessary to adopt a connection method that gives priority to the contact resistance when the radio wave shield plate 13 is joined. As a result, the magnetic plate 1
A gap S is inevitably generated between 2 ′ and 12 ′ as shown in FIG. As described above, the gap S is indispensable for dimension adjustment to make the space have a predetermined dimension.

On the other hand, the air gap S increases the magnetic resistance of the wall in the magnetic circuit, induces a leakage magnetic flux, and deteriorates the magnetic shielding performance. Here, in the magnetic circuit shown in FIG. 8B, when a gap having a length of S is provided between the wall panels, the magnetic resistance R per unit length in the gap S is determined.
1 is as follows: When the symbol A is a cross-sectional area per unit length of the magnetic plate 13, R1 = S / (μ0 · A) = S / (μ0 · t)... The ratio is (R1 / R0) = (μ / μ0) · S = μr · S... Here, μ0 = 4π × 10 ⁻⁷ [H / m], μr
Indicates relative magnetic permeability.

Now, here, for example, S = 1 [c
Even if [m] = 10 ^-2 [m], if the relative magnetic permeability μr is 10 ² or more, R1> R0, so that leakage of magnetic flux is inevitable. Further, if a magnetic material having a low magnetic resistance, that is, a large μr is selected in consideration of a good magnetic shield, R1≫R0 is obtained from the equation, and the leakage magnetic flux is further increased. I will.

On the other hand, in the radio wave / magnetic shield room of the panel joint type according to the above-described embodiment,
As shown in FIG. 1, a magnetic material such as iron coated with a good conductive metal such as zinc or copper is used as a connecting member 2 between panels at a contact surface, and a magnetic material is provided via a radio wave shield plate 13. It is disposed in a state of facing a magnetic shield plate made of a material with a considerable area.

Accordingly, the equivalent magnetic circuit in this case is as shown in FIG. 9, and the circuit resistance is prevented from being reduced due to the above-mentioned gap S, and an advantageous effect that a good radio wave / magnetic shield function can be realized.

In the equivalent circuit of FIG. 9, R0 represents the magnetic circuit resistance of the left magnetic shield plate at the space S in FIG. R0 'represents the magnetic circuit resistance of the right magnetic shield plate joined by the connecting member 2. If the panel dimensions and shape are the same on the left and right, R0
= R0 '.

Further, R2 represents a magnetic circuit resistance of the connecting member 2 (see FIG. 1), and R3 represents a magnetic circuit generated between the connecting member 2 and the magnetic shield plate 12 disposed opposite each other via the radio wave shield plate. Represents resistance.

Assuming that the width of the connecting member 2 in FIG. 1 is Lw and the thickness is d, the magnetic resistance R3 per unit length along the gap S of the member is a nonmagnetic material whose radio wave shield plate has a thickness δ. If, if R3 = [delta] / [mu _o · [(Lw -S) / 2]] (H) ^-1 ......... next, the permeability of the connecting member 2 mu ', is R2, R2 = Lw / μ '· D [H] ^-1 ……………………………

Here, when comparing the above-mentioned formula with the formula, "(Lw-S) / 2） A" is obtained from "S「 δ ". Also, when comparing the above equation with the equation, “μ′≫
If μ0, d> t, it is also clear that R1≫R2, so that R1 can be neglected, and a good magnetic shield space not affected by the gap S can be realized.

This will be described in more detail with reference to specific numerical values. In FIG.
A magnetic plate having r = 3,000 is used, and its thickness t is set to 1
[Mm]. And the radio wave shield plate 13
For example, it is assumed that a copper plate (non-magnetic material) having δ = 1 [mm] is adopted. Further, as the connecting member 2, the thickness d = 3.2.
[Mm], a magnetic material of μr = 900 is used, and a copper foil having a thickness of about several tens of microns is laid on an electric contact surface with a radio wave shield plate. Further, S = 10
[Mm] and Lw = 80 [mm],

The equation is as follows: R0 = 1 / (4π × 10^-7× 3 × 10^Three× 10^-3) = 1 / (1.2π × 10^-6) ≒ 2.7 × 10^Five[H]^-1 ………………………… The formula is: R1 = 10^-2/ (4π × 10^-7× 10^-3) = 1 / (4π × 10)^-8) ≒ 8 × 10⁶[H]^-1  The formula is: R3 = 10^-3/ (4π × 10^-7× 35 × 10^-3) = 1 / (140π × 10)^-7) ≒ 2.3 × 10^Four[H]^-1  However, the thickness of the thin copper foil is ignored here.

The equation is as follows: R 2 = 8 × 10^-2/ (4π × 10^-7× 9 × 10^Two× 3.2 × 10^-3) = 8 × 10^-2/(1.15π×10^-6) ≒ 2.2 × 10^Four[H]^-1   Becomes

That is, R 0, R 1, and R 2 each represent R
0 = 2.7 × 10^Five[H]^-1 , R1 = 8 × 10⁶[H]
^-1 R2 = 2.2 × 10^Four[H]^-1 , R3 = 2.3 ×
10^Four[H]^-1In the equivalent circuit of FIG. 9, 2R
3 + R2 = 6.8 × 10^Four[H], and 2R3
Since + R2≪R1, R1 can be ignored.
You.

On the other hand, the connecting member 32 in FIG.
Focused on shielding performance, reducing surface contact area
And the tightening pressure by the joining screws 5A and 5B
It adopts a strong structure. Therefore, the magnetic circuit
Is that the magnetic resistance at the contact surface is large, and d = 3.2
When [mm], R3 = 10^-3/ (4π × 10^-7× 3.2 × 10^-3) = 1 / (1.3π × 10^-6) = 2.4 × 10^Five  However, since it is one digit smaller than R1,
One can be ignored. Thus, each of the above embodiments
According to the state, the shield room of the radio wave / magnetism by the panel formation
Can be realized easily and with high performance.

[0086] To be further mentioned, FIG.
In FIG. 5, magnetic shield plates 12 are provided on both sides of the panel body 11 of the wall panel.
Since this double structure is parallel as a magnetic circuit, the characteristic magnetic resistance R0 of the main line becomes "R0 / 2", which indicates that the shielding performance is greatly improved.

[Radio Wave Shield] In order to perform radio wave shielding (ie, electromagnetic wave shielding), it is necessary that a space requiring shielding be closed by a metal member having excellent conductivity. However, also in this case, it is impossible to close the space with a continuous metal member like the magnetic shield, and a seam is required. For the seam, although the method using soldering or welding can be expected to provide the most reliable shielding effect, it takes a very long time as a construction method and also involves the danger of fire, etc., because it involves heat.

On the other hand, the panel construction method has the feature of avoiding these difficulties. However, since the panels are connected to each other by bolts or the like, the contact resistance between adjacent joints increases, and a gap is generated. In addition, the shielding effect against high-frequency electromagnetic waves is deteriorated. FIG. 10 is a cross-sectional view showing a case where two adjacent panels are joined by two flat plates. In FIG. 10, it is generally known that the shielding effect becomes worse as the joining member 2 ′ is thinner and the interval between joining bolts or screws is wider. here,
Reference numeral 13 'denotes a radio wave shield plate, and reference numeral 11 denotes a panel body similar to that of FIG.

Therefore, in the above embodiment, as shown in FIG. 1, the joining member 2 is provided with a folded portion 2A to prevent a small gap generated when the joining screws 5A and 5B are fastened and to reduce the contact resistance by the fastening force. So that it works effectively. Further, in the embodiment shown in FIGS. 5 and 6 described above, the joining member 2 of FIG. 1 is used upside down so that the folded portion 32a allows the fastening force of the joining screws 5A and 5B to be suspended in a small area. The contact resistance of the joint is remarkably reduced.

Here, the influence of the contact resistance between the joining members and the shielding effect such as opening of the joining member 2 ′ as shown in FIG. 11 will be described in detail. FIG. 11 is a partial cross-sectional view as seen from the direction of arrow M in FIG.

Now, in the shielded room, the characteristic admittance of the outdoor free space at the junction is Y0, and the indoor side is Y0.
And the conductance and susceptance derived from the fastening of members at the joint by screws are G and B, respectively, the equivalent circuit for electromagnetic waves at the joint is
It can be represented almost as shown in FIG. The conductance G is the reciprocal of the contact resistance R, and the susceptance B is shown in FIG.
This is a susceptance depending on the length a of the mouth caused by opening of the mouth due to the bending of the joining member 2 ′ shown in FIG.

Here, in order to briefly explain the effectiveness of the above-described embodiment, if Y 0 ′ = Y 0 and conductance G and susceptance B are values normalized by Y 0, the power transmission coefficient showing the shielding effect 1T1 ² is represented by 1T1 ² = 4 (1 + G) / [(2 + G) ² + B ² ]. Here, “1T1” indicates the absolute value of T (the same applies hereinafter).

Since the conductance G and the susceptance B in this equation are based on the admittance generated between the screws of the joining screw, when the susceptance B exists, the conductance G is no longer the contact conductance but the contact conductance. It should be considered as the input conductance, and when the susceptance B does not exist, the conductance G is considered as the contact conductance.

Now, assuming that the susceptance B = 0, 1T1 ² = [4 (1 + G) / (2 + G) ² ] / [4 / (12 + G)] (G → large)... because become, shielding effect will be large enough 1T1 ² is small. This indicates that more 1T1 ² decreases conductance G is large. Since the conductance G is the reciprocal of the contact resistance R, if “R → small”, “G → large”.

That is, the folded portion 2A provided in the joining member 2 of FIG. 1 in this embodiment exhibits an effect for preventing the generation of the susceptance B due to the tightening of the screw.
Further, in FIG. 5, since the tightening force is concentrated on the protruding portion 32a provided at the end, the conductance G can be further increased, and "1T1 ² → 0" can be approached, so that the shielding performance is improved. Also, the connecting member 3 in FIG.
The third partition plate (horizontal rib) 33Ab is provided to keep susceptance B, which is likely to be generated by screwing with the bolt 5A, at zero.

[0085]

According to the present invention, the magnetic shield plate and the radio wave shield plate are provided on both sides of the panel main body, and have a double structure as a whole. When a shield room is formed by using this, the magnetic shield and the radio wave shield can be extremely effectively formed inside and outside the shield room.

Further, since the shield panel itself is formed in a thick plate shape with the lightened panel body interposed therebetween, the shield panel itself can be self-supported. Is not required, and not only the construction work for the facility can be performed efficiently, but also the area occupied by the outer wall portion of the shield room is reduced, so that the entire shield room can be downsized.

Further, when the shield panel is connected using the connecting member, the connecting member is provided so as to cover the connecting portion. For example, it is possible to perform adjustment by providing a gap between the shield panels of the connecting portion. Therefore, assembly adjustment on site can be smoothly performed. For this reason,
An unprecedented shield room shield that can perform assembly work of the shield room efficiently and can perform the work of magnetic shield and radio wave shield at once, so that the work can be done quickly and reliably. A panel and an assembly thereof can be provided.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing a first embodiment of the present invention.

FIG. 2 is a partially omitted front view viewed from an arrow K side in FIG. 1;

3 is a partial cross-sectional view showing a connecting corner (a structure of a corner area of the shield room) of the shield panel assembly for a shield room disclosed in FIG. 2;

FIG. 4 is a schematic explanatory view showing an example of a shield room formed based on the shield panel assembly for a shield room disclosed in FIG. 1; FIG. 2 is a partial sectional view showing the first embodiment of the present invention.

FIG. 5 is a partial cross-sectional view showing a second embodiment of the present invention.

FIG. 6 is a partially omitted front view viewed from an arrow K side in FIG. 5;

FIG. 7 is an explanatory diagram for explaining the principle of the magnetic shield; FIG. 7A is an explanatory diagram showing a closed space of the magnetic shield;
FIG. 7B is an explanatory view showing an example of the wall surface magnetic material in FIG. 7A.

8A and 8B are explanatory views showing a connection state of wall surfaces for explaining the principle of a magnetic shield; FIG. 8A is an explanatory view showing a case where magnetic shield plates are overlapped and connected; FIG. 8B is a magnetic shield plate; FIG. 6 is an explanatory diagram showing a state of a leakage magnetic flux generated when the ends of the above are butted with a gap therebetween.

FIG. 9 is an explanatory diagram showing an equivalent circuit when the magnetic circuit disclosed in FIG. 1 is electrically displayed.

FIG. 10 is an explanatory diagram for explaining the principle of the magnetic circuit disclosed in FIG. 1;

FIG. 11 is an explanatory diagram showing an example of a case where the connecting member in FIG. 10 is bent.

FIG. 12 is an explanatory diagram showing a schematic equivalent circuit with respect to electromagnetic waves at a joint in a shielded room having the structure shown in FIG. 10;

FIG. 13 is an explanatory diagram showing an example of a shield room in the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shield room panel assembly 2, 3, 32, 33 Connecting member 4 Shield panel 5A, 5B Bolt 11 Panel main body 12 Magnetic shield plate 13 Radio shield plate 32Ab, 33Ab Partition plate

[Procedure amendment]

[Submission date] December 27, 1999 (1999.12.
27)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Shield panel assembly

[Claims]

1. A shield panel assembly comprising a plurality of shield panels disposed on the same surface and connecting said adjacent shield panels by a connecting member, wherein each of said shield panels is made of a lightweight member. A panel body having a honeycomb structure and formed in a thick plate shape, and a shield plate having a laminated structure including a magnetic shield plate and a radio wave shield plate respectively provided on both sides of the panel body; A shield plate having a laminated structure provided on both sides of the main body, a structure in which a magnetic shield plate is arranged on the side that comes into contact with the panel main body, and a radio wave shield plate is arranged outside the magnetic shield plate; Pre-determined to absorb assembly errors between the butted parts of the panels In addition to providing the space S, a pair of connecting members having a U-shaped cross section are arranged at the butted portions of the shield panels so as to cover the gap S, and the pair of connecting members is made of a magnetic member having conductivity. A shield panel assembly, wherein each of the pair of connecting members and an end of each of the shield panels are individually penetrated by bolts and integrated.

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a shield panel set.
The present invention relates to a three-dimensional structure , and more particularly to a shield panel assembly for a shield room for both a magnetic shield and a radio wave shield.

[0002]

2. Description of the Related Art Conventionally, shield rooms for radio waves have been
It has been used more frequently than ever before for use as experimental equipment for radio waves and to suppress radio interference caused to peripheral devices when various electronic devices are prototyped.

[0003] On the other hand, various electronic devices using strong magnets, such as magnetic resonance image diagnostic devices (MRI devices), have been commercialized in response to recent social demands. This MRI apparatus is for photographing a cross-sectional image of a human body.
2,000 Gauss) to 2 Tesla for a predetermined time, and at the same time, the space around the outside
It is exposed to a strong magnetic field from the I device.

For this reason, if this is left unattended, even if a magnetic field of about 10 gauss is generated due to, for example, magnetic leakage to the surroundings, the surrounding precision electronic equipment malfunctions. When walking near the MRI apparatus during operation, there is a great danger that the pacemaker easily malfunctions.

In the above-mentioned MRI apparatus, a weak electromagnetic wave generated in the human body by magnetic resonance is accurately measured and imaged. Therefore, a radio wave shield room for strictly shielding external radio waves is provided for the entire apparatus (or a part thereof).

FIG. 15 shows an example (schematic cross-sectional view) of a shield room 500 generally known conventionally. In the conventional example shown in FIG. 15, a magnetic shield plate 101 is provided around the MRI apparatus 100 first. The magnetic shield plate 101 is held by, for example, four columns 201. Further, on the outer periphery of the magnetic shield plate 101, a radio wave shield plate is provided so as to overlap with the magnetic shield plate 101 (or with a predetermined gap therebetween).

[0007] Here, reference numeral 103 indicates an interior cross portion, and reference numeral 104 indicates an opening / closing door. This opening / closing door 104
Also, a magnetic shield and a radio shield are provided. The same magnetic shield and radio wave shield are applied to the floor and the ceiling.

[0008]

However, in the above-mentioned conventional example, a column is required to provide the magnetic shield and the radio wave shield, and the magnetic shield plate and the radio wave shield plate must be separately constructed. However, there is an inconvenience that the operation becomes complicated. In addition, prop 201
Therefore, it is necessary to secure a predetermined occupied area for the construction, and the entire area of the shield room becomes unnecessarily large.

[0009] On the other hand, in recent years, a magnetic shield plate and a radio wave shield plate have been integrated. However, in many of these cases, the magnetic shield plate and the radio wave shield plate are simply superimposed, and therefore, in order to equip the magnetic shield plate and the radio wave shield plate, the same support column 201 as in the above-described conventional example is always required. Was. In addition, when the column 201 is not used and the column 201 is not used, it is usually necessary to provide a gap in the magnetic plate even at the expense of the magnetic shielding performance, since it is necessary to give priority to radio wave shielding. Was.

[0010]

An object of the present invention is to solve the disadvantages of the prior art and, in particular, to provide a shield panel for a magnetic and magnetic / radio wave shielded room which is simple in construction and can simultaneously and effectively perform a magnetic shield and a radio wave shield. And an assembly thereof.

[0011]

In order to achieve the above object, in each of the inventions according to claims 1 to 4 , they are arranged on the same plane.
Shielded Panels
Shields that are connected by a connection member
In the panel assembly, each shield panel described above is
Honeycomb structure made of lightweight material and formed in thick plate shape
Equipped on both sides of the panel body and this panel body
Magnetic shield plate and radio wave shield plate
And a shield plate having a laminated structure comprising
I do.

In addition, the above-mentioned laminated shield plates provided on both sides of the panel main body are provided, and a magnetic shield plate is disposed on the side that comes into contact with the panel main body, and a radio wave shield plate is disposed outside the magnetic shield plate. Structure.

Furthermore, provided with a predetermined clearance S for assembling error absorption between mutually abutting portions of each shield panel, the previously described pair of coupling members of U-shaped cross section so as to cover the gap S shield It is arranged at the butted part of the panel.

[0014] Then, the pair of connecting members, thereby forming a magnetic member having conductivity, integrated through separately and end of each shield panel described above with the pair of the connecting member by a bolt Is provided as the common basic configuration.

For this reason, in each of the first to fourth aspects of the present invention, as shown in FIG. 1, the magnetic shield plate and the radio wave shield plate are provided on both sides of the panel main body with the panel main body interposed therebetween. Due to the double structure, when this is used to form a shield room, the effects of the magnetic shield and the radio wave shield can be doubled.

Further, since the magnetic shield plate and the radio wave shield plate are laminated on both surfaces of the shield panel itself with the lightened panel body therebetween as described above, the shield panel itself is formed as a thick plate. In this way, it is possible to stand alone, and thus, when forming the shielded room, a support is not required, and construction work for the facility can be performed efficiently.

Furthermore, when the connection of the shield panel, as shown in FIG. 1, and provided with a gap S for assembling error absorption in the connecting portion so as to cover the gap S equipped with a coupling member as described above Since the pair of connecting members and the ends of the shield panels described above are individually penetrated and integrated by bolting, for example, it is possible to adjust the position between the shield panels of the connecting portions, and therefore, Can be performed smoothly, and as a result, the assembly work of the shield room can be performed efficiently, and the work of the magnetic shield and the radio wave shield can be performed at the same time. And it can surely be achieved.

[0018] Here, a panel body as described above, may be formed of paper as a material. This makes it possible to obtain a lightweight, inexpensive, and strong panel body.

Furthermore, the connecting member as described above, may be formed of iron plate coated with zinc. In this case, zinc is an electrically good conductor, and can reduce the contact resistance when connected, and as a result, the electrical resistance between the panels in the entire shield room panel assembly is reduced, and the zinc is assembled. The electric resistance is reduced for the entire panel, and in this respect, the performance of the radio wave shield can be improved as a whole.

Further , both ends of the radio wave shield plate constituting the outer surface of the shield panel may be bent along the end surface of the panel body.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment A first embodiment of the present invention will be described below with reference to FIGS. First, in FIGS. 1 to 3, reference numeral 1 denotes a panel assembly for a shield room. As shown in FIG. 1, this shield room panel assembly 1 includes a plurality of shield panels 4, 4... Having the same structure, which are arranged on the same surface and connected by connecting members 2, 3. I have. FIG.
FIG. 2 shows a part of a front view as seen from the direction of arrow K in FIG. 1.

FIG. 4 shows a shield room 10 formed by using the shield room panel assembly 1.
In the shield room 10, a medical MRI apparatus 1 is provided.
00 is arranged. Further, reference numeral 10A denotes a shield door having each shield function of a radio wave shield and a magnetic shield as described later.

In this case, a predetermined gap S is provided at the butted portion of each of the above-mentioned shield panels 4 constituting the panel assembly 1 for the shield room 10 as shown in FIG. This gap S is set to an arbitrary size. Then, an assembling error generated when assembling the shield room can be absorbed by the gap S. Therefore, in assembling the shield room, special skill is not required, and the work efficiency can be further improved.

Each of the shield panels 4 described above is, for example,
A panel body 11 formed of a lightweight member having a honeycomb structure made of paper or the like and having a thick plate shape, and a magnetic shield plate 12 having a predetermined thickness laminated on both sides of the panel body 11
And a radio wave shield plate 13.

Here, as the magnetic shield plate 12, for example, a laminate of silicon steel plates having a thickness of 0.35 [mm] is used. In addition, radio wave shield plate 13
The thickness is 0.8 [m] in which one or the other surface or both surfaces are coated with electrically good zinc.
m] is used. Further, the radio wave shield plate 13 is laminated outside the above-described magnetic shield plate 12.

That is, each shield panel 4 has a magnetic shield plate 12 on both sides of the panel body 11 and an inner side.
, And a radio wave shield plate 13 on the outside. Here, the radio wave shield plate 13 may be formed using copper or aluminum as a material. The thicknesses of the magnetic shield plate 12 and the radio wave shield plate 13 may be other than those described above. Also, this radio wave shield plate 13
Alternatively, the end of the shield panel 4 may be bent toward the end face of the panel body 11 as shown in FIG.

As described above, in the shield panel 4, the magnetic shield plate 12 and the radio wave shield plate 13 are respectively overlapped with the panel body 11 interposed therebetween, and the whole has a double structure on both sides. Since the magnetic shield plate 12 is also multiplexed on one side and the other side (a plurality of sheets are stacked), if this is used to form a shield room, the magnetic shield and the radio wave shield are simultaneously and extremely effective. There is an advantage that it can be executed reliably.

Further, since the shield panel 4 itself is formed in a thick plate shape, the shield panel 4 itself can be self-sustained. Therefore, when the shield room 10 is formed, a support column is not required, and facilities are required. Not only can the construction work be performed efficiently, but also the area occupied by the outer wall portion of the shield room 10 is reduced accordingly.
The effective area of the shield room 10 can be widened, the construction work for the facility can be performed efficiently, and the construction of the magnetic shield and the radio wave shield can be performed at the same time. There is an advantage that it can surely be achieved.

In the present embodiment, the connecting members 2 and 3 are formed of a long plate-like member having a U-shaped cross section. As shown in FIG. 1, the connecting members 2 and 3 cover the butted portions ( spaces S) of the shield panels 4 arranged on the same surface from both sides (from inside and outside). The shield panels 4 are mounted on both sides of the butted portion of the shield panel 4.

Reference numerals 2A and 3A denote outer projecting portions provided at both ends of the outer connecting member 2 and the inner connecting member 3, respectively. The outer protrusions 2A, 3A are connected to the respective connecting members 2,
3 for enhancing the strength, and is formed by bending each side end.

The connecting members 2 and 3 are formed of a conductive magnetic member such as a steel plate. Specifically, a steel sheet coated with zinc (Zn) on both sides is used. For this reason, when viewed from the inside of the shield room, a continuous magnetic circuit is formed by the connecting members 2 and 3 at the butted portion of the shield panel 4, and since the connecting members 2 and 3 are also conductive members, radio wave shielding is performed. In such a point, the magnetic shield and the radio wave shield at the connection portion form a double wall surface, and the performance is reliably maintained.

The connection of the shield panels 4 by the connecting members 2 and 3 is performed by bolts 5A and 5B. As shown in FIGS. 1 and 2, in this embodiment, the other connecting member 3 located inside is provided with the bolts 5 </ b> A,
Screw holes 3a and 3b for 5B are provided. The screw holes 3a and 3b are formed in a drawn hole portion formed by drawing a part of the connecting member 3 described above. Here, the screw holes 3a and 3b may be formed by welding nuts instead.

Each of the connecting members 2 and 3 has a ridge 2 at each end thereof.
A and 3A are disposed in a state of protruding outward (that is, each flat portion is in contact with the outer surface of the end of each shield panel 4) so as to connect the ends of the respective shield panels 4. Has become. The bolts 5A, 5B, the panel body 11, the magnetic shield 12, and the radio wave shield 13 laminated on both sides of the panel are penetrated toward the screw holes 3a, 3b. The members 2 and 3 are connected.

As described above, in the present embodiment, the predetermined gap S is provided between the butted portions of the shield panel 4 described above, and the projecting portions 2A are formed on both sides of the gap S to the outside.
(Or 3A) are disposed so as to cover the gap S by connecting members 2 and 3 having a U-shaped cross section, and the one and the other connecting members 2 and 3 are connected by bolting across the panel body 11. It has become.

For this reason, the connecting operation is performed by the bolt 5
Since the shield panels 4 are connected to each other by A and 5B, there is an advantage that the shield room can be easily and quickly assembled on site.

[0036] Here, in the above embodiment, the connecting member 2 has been exemplified a case formed by and elongated flat plate member in a U shape, outwardly to and opposite end portions in sectional Mengyaku U-shaped It may be a shape provided with an extended fixing mounting portion.

Reference numeral 15 denotes an interior board and an interior cross portion. The interior board and the cross portion are fixed by interior fittings attached to the radio wave shield plate 13 (not shown). Further, in FIG. 2, reference numeral 16 indicates a floor-side shield member.

FIG. 3 is a partial cross-sectional view showing the structure of the corner area of the shield room. The corner area shown in FIG. 3 shows a structure for connecting the panel assemblies 1 which are in contact at right angles to each other. Reference numeral 21 denotes an outer connecting member, and reference numeral 22 denotes an inner connecting member.

In this case, in FIG. 3, the end face of the shield panel 4 located on the lower side in FIG. 1 abuts on the side face of the end of the shield panel 4 located on the upper side in the figure. And the other end of each panel assembly 1 is in contact with each other at right angles.

The above-described outer connecting member 21 and inner connecting member 22 form a part of the corner area, and are sandwiched between the connecting members 21 and 22 to connect the one and the other panel assemblies 1. (A corner area of the shield room).

Here, the shield panel 4 located on the upper side in FIG. 3 is provided with a portion sandwiched between the outer connecting member 21 and the inner connecting member 22 so as to pass through the panel main body 2 from the inner connecting member 22. First, the inner connecting member 22 and the outer connecting member 21 are integrally connected by a bolt 5A screwed into a screw hole 21a formed in the outer connecting member 21 formed.

On the other hand, the shield panel 4 located on the lower side in FIG.
Are provided so as to penetrate from the outer connecting member 21 to the panel main body 2 and the inner connecting member 22, and are integrally connected to the outer connecting member 21 and the inner connecting member 22 by bolts 5B.

As a result, the connecting portion (corner region of the shield room) between the above-mentioned one and the other panel assemblies 1 is formed. Here, the outer connecting member 21 and the inner connecting member 22 are both made of the same material as that of the above-described connecting member 2 and processed in the same manner (the surface is coated with zinc).
Reference numerals 21A and 22A denote outer connecting members 21 respectively.
And the outer protruding portions (protruding portions) provided at both ends of the inner connecting member 22. These outer protrusions 21A and 22A are
It is for strengthening the strength of each connecting member 21, 22.
Each side end is formed by bending.

For this reason, the connecting portion (the corner area of the shield room 10) of the one and the other panel assemblies 1 is also
The connection between the shield panels 4 in each of the panel assemblies 1 is performed under exactly the same magnetic and electrical conditions, and in this regard, the connection portion (the corner area of the shield room 10) is also excellent. A simple magnetic shield and a radio wave shield can be realized.

Here, in FIG.
Denotes an interior cloth, and reference numeral 10A denotes an opening / closing door.
The opening and closing door 10A is also provided with a magnetic shield and a radio wave shield substantially similar to the shield panel 4 in FIG.

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

First, in FIG. 4, when the MRI apparatus 100 is operated, a strong magnetic field is generated around the MRI apparatus 100. On the other hand, since each panel 4 constituting the shield room 1 has the magnetic shield plate 12 provided inside and outside the shield room 1 ,
Intense magnetism generated in the part leaks to the outside in two stages
And蔽shielding Te, reduced to a degree that does not adversely affect the leakage magnetic field intensity of leaking to the outside to the outside. For this reason, even if a patient having a pacemaker or the like walks on the side of the shield room 1, no inconvenience is given to the operation of the pacemaker.

On the other hand, the MRI apparatus 100 is used to capture a weak magnetic resonance signal derived from the human body and output to the outside. As a result, the formation of an MR image is hindered. On the other hand, as described above, the shield room 1
Each panel 4 is provided with the radio wave shield plate 13 inside and outside the shield room 1, so that it shields the radio wave shield plate in two stages as in the case of the magnetic shield, and almost all radio waves arriving from the outside. Completely shielded. Therefore, there is no adverse effect on the image formation of the internal MRI apparatus 100.

As described above, when the shield room 1 having the two shielding functions of the magnetic shield and the radio wave shield is formed, by using the above-described shield panel 4 or the panel assembly 1, the occupied area of the MRI imaging room is reduced. It is possible to obtain a shield room 1 that can be formed somewhat wider than the conventional one, and at the same time, has an enhanced shielding effect and can perform assembly work quickly.

[Second Embodiment] Next, a second embodiment will be described with reference to FIGS. In the second embodiment shown in FIGS. 5 and 6, the connecting members 32 and 33 equivalent to the U-shaped connecting members 2 and 3 provided in the first embodiment shown in FIG. Unlike the case of
As shown in FIG. 5, it is characterized in that it is mounted in the opposite direction. FIG. 6 shows a part of the front view as seen from the direction of arrow K in FIG.

As shown in FIG. 5, one of the connecting members 32, 33 is provided with a long member main body 32A having a U-shaped cross section and on both sides of the long member main body 32A. The protruding ridge portion 32a, the through hole 32Aa for bolting provided at a predetermined position of the long member main body 32A, and the inner surface side of the long member main body 32A described above is appropriately partitioned with the through hole 32Aa interposed therebetween. And a plurality of partition plates 32Ab that reinforce the strength of the long member main body 32A.

As shown in FIG. 6B, the other connecting member 33 has a long member main body 33A having a U-shaped cross section and ridges 33a provided on both sides of the long member main body 33A.
And a screw hole 33Aa for a bolt provided at a predetermined position of the long member main body 33A, and appropriately partitioning the inner surface side of the long member main body 32A described above with the screw hole 32Aa interposed therebetween. And a plurality of partition plates 33Ab that reinforce the strength. Here, the screw hole 32Aa of the other connecting member 33 is formed as a drawing hole.

Further, each partition plate 32Ab, 33Ab is
Both are integrally fixed to the elongated member main bodies 32A, 33A so as to cross the elongated member main bodies 32A, 33A inside. Therefore, the connecting members 32, 3
Even if 3 is equipped as shown in FIG. 5, one and the other shield panels 4, 4 can be effectively connected as in the case of FIG. Other configurations are the same as those of the embodiment of FIG. 1 described above.

In this case, when the connecting members 32 and 33 are connected to the shield panels 4 and 4 by bolts 5A and 5B, the connecting members 32 and 33 are provided on both sides of the elongated member main bodies 32A and 33A by the tightening force of the bolts 5A and 5B. The distal ends of the projected ridges 32a, 33a are strongly pressed against the radio wave shield plates 13, 13 on the front side of the shield panels 4, 4. As a result, the contact resistance at the relevant portion is reduced, and at this point, one and the other radio wave shield plates 13, which are laminated on the surface side of each shield panel 4, 4,
13 can reduce the electric resistance between them, and the effect of radio wave shielding by each radio wave shield plate 13 can be further enhanced. Other functions and effects are the same as those of the embodiment shown in FIG. 1 described above.

Next, the functions of the magnetic shield and the radio wave shield common to the above embodiments will be described in detail.

[Magnetic Shield] As a prerequisite for performing a magnetic shield (ie, a magnetic shield), at least a space that needs to be shielded must be closed by a magnetic material having a required thickness. Such a condition is that when there is a magnetic field source having a magnetic pole inside, even when it is desired to keep the magnetic field of the magnetic field source in the required space as much as possible, or when there is an external magnetic field source. This is a necessary condition even when it is desired to minimize the influence of the magnetic field in the required space.

This necessary condition is equivalent to forming a three-dimensional closed space magnetic path having a predetermined thickness in the required space. Therefore, the shielding performance depends on the magnitude of the magnetic resistance (reluctance) of the wall magnetic circuit forming the closed space.

Here, a rectangular case as shown in FIG. 7 (a) is assumed, which is made of a magnetic plate 12 'having a thickness t, and a magnetic field having a magnetic pole inside the case is generated. Consider the case where the source is placed. In this case, the theoretical background for suppressing the spread of the magnetic field by the magnetic field source as small as possible is examined. Now, as shown in FIG. 7B, the thickness of the wall magnetic material is t [m], the magnetic permeability is μ [H / m], and the cross-sectional area per unit length of the wall magnetic material is A. The length of the magnetic path is L0
Assuming that [m], R0 = L0 / (. Mu..A) = 1 / (. Mu..t) [H] ^-1 ... Here, H is indicated as Henry (unit). This R
0 is smaller as the magnetic permeability μ is larger, and the plate thickness t
The larger the is, the smaller it is. In other words, the shielding performance increases as the magnetic permeability of the magnetic material on the wall surface increases and the plate thickness t increases.

However, in general, when a magnetic shield chamber is formed, it is impossible to close the space with a continuous homogeneous magnetic wall having a constant thickness. That is, the magnetic plate 1
It is necessary to derive a seam for 2 '.

This seam increases the magnetic resistance, so that the magnetic flux leaks at the seam and the shielding performance deteriorates. For this reason, as shown in FIG. 8A, measures have been taken to prevent the magnetic resistance of the magnetic path from increasing by superposing the magnetic plates 12 ', as shown in FIG. 8A. However, such measures are
Although it is relatively easy to separately implement the radio wave shield and the magnetic shield, it is not easy to perform the radio wave and the magnetic shield by using a self-supporting wall panel having a thickness in which both are integrated.

Therefore, when radio waves and magnetic shielding are performed by this thick free-standing wall panel, the radio wave shielding function depends on the low contact resistance at the time of joining between the panels. I have to. For this reason, as shown in FIG. 1 described above, it is necessary to adopt a connection method that gives priority to the contact resistance when the radio wave shield plate 13 is joined. As a result, the magnetic plate 1
As shown in FIG. 8 (b), there is necessarily a gap between 2 ′ and 12 ′.
The interval S is caused. This gap S is indispensable for dimension adjustment to make the space have a predetermined dimension as described above.

On the other hand, the gap S increases the magnetic resistance of the wall in the magnetic circuit, induces a leakage magnetic flux, and deteriorates the magnetic shielding performance. Here, in the magnetic circuit shown in FIG. 8B, when a gap having a length of S is provided between the wall panels, the magnetic resistance R per unit length in the gap S is provided.
1 is as follows: When the symbol A is a cross-sectional area per unit length of the magnetic plate 13, R1 = S / (μ0 · A) = S / (μ0 · t)... The ratio is (R1 / R0) = (μ / μ0) · S = μr · S... Here, μ0 = 4π × 10 ⁻⁷ [H / m], μr
Indicates relative magnetic permeability.

Now, here, for example, S = 1 [c
Even if [m] = 10 ^-2 [m], if the relative magnetic permeability μr is 10 ² or more, R1> R0, so that leakage of magnetic flux is inevitable. Further, if a magnetic material having a low magnetic resistance, that is, a large μr is selected in consideration of a good magnetic shield, R1≫R0 is obtained from the equation, and the leakage magnetic flux is further increased. I will.

On the other hand, in the radio wave / magnetic shield room of the panel joint type according to the above-described embodiment,
As shown in FIG. 1, a magnetic material such as iron coated with a good conductive metal such as zinc or copper is used as a connecting member 2 between panels at a contact surface, and a magnetic material is provided via a radio wave shield plate 13. It is disposed in a state of facing a magnetic shield plate made of a material with a considerable area.

Accordingly, the equivalent magnetic circuit in this case is as shown in FIG. 9, and the reduction of the circuit resistance due to the gap S described above is prevented, and an advantageous effect that a good radio wave / magnetic shield function can be realized.

In the equivalent circuit of FIG. 9, R0 represents the magnetic circuit resistance of the left magnetic shield plate at the space S in FIG. R0 'represents the magnetic circuit resistance of the right magnetic shield plate joined by the connecting member 2. If the panel dimensions and shape are the same on the left and right, R0
= R0 '.

Further, R2 represents a magnetic circuit resistance of the connecting member 2 (see FIG. 1), and R3 represents a magnetic circuit generated between the connecting member 2 and the magnetic shield plate 12 disposed opposite each other via the radio wave shield plate. Represents resistance.

Assuming that the width of the connecting member 2 in FIG. 1 is Lw and the thickness is d, the magnetic resistance R3 per unit length along the gap S between the members is a nonmagnetic material whose radio wave shield plate has a thickness δ. If, if R3 = [delta] / [mu _o · [(Lw -S) / 2]] (H) ^-1 ......... next, the permeability of the connecting member 2 mu ', is R2, R2 = Lw / μ '· D [H] ^-1 ……………………………

Here, when comparing the above-mentioned formula with the formula, "(Lw-S) / 2） A" is obtained from "S「 δ ". Also, when comparing the above equation with the equation, “μ′≫
μ0, d> t ”, it is also clear that R1≫R2, so that R1 can be ignored and the gap
A good magnetic shield space which is not affected by the gap S can be realized.

This will be described in more detail with reference to specific numerical values. In FIG.
A magnetic plate having r = 3,000 is used, and its thickness t is set to 1
[Mm]. And the radio wave shield plate 13
For example, it is assumed that a copper plate (non-magnetic material) having δ = 1 [mm] is adopted. Further, as the connecting member 2, the thickness d = 3.2.
[Mm], a magnetic material of μr = 900 is used, and a copper foil having a thickness of about several tens of microns is laid on an electric contact surface with a radio wave shield plate. Further, S = 10
[Mm] and Lw = 80 [mm],

The equation is as follows: R0 = 1 / (4π × 10 ⁻⁷ × 3 × 10 ³ × 10 ⁻³ ) = 1 / (1.2π × 10 ⁻⁶ ) ≒ 2.7 × 10 ⁵ [H] ⁻¹ ………………………… The formula is: R1 = 10 ^-2 / (4π × 10 ⁻⁷ × 10 ⁻³ ) = 1 / (4π × 10 ⁻⁸ ) ≒ 8 × 10 ⁶ [H] ^{−1 The} formula is: R3 = 10 ⁻³ / ( 4π × 10 ⁻⁷ × 35 × 10 ⁻³ ) = 1 / (140π × 10 ⁻⁷ ) ≒ 2.3 × 10 ⁴ [H] ⁻¹ . Here, the thickness of the thin copper foil is ignored. I have.

The equation is as follows: R2 = 8 × 10 ⁻² / (4π × 10 ⁻⁷ × 9 × 10 ² × 3.2 × 10 ⁻³ ) = 8 × 10 ⁻² /(1.15π×10 ⁻⁶ ) ≒ 2.2 × 10 ⁴ [H] ⁻¹ .

That is, R 0, R 1, and R 2 each represent R
0 = 2.7 × 10 ⁵ [H] ⁻¹ , R1 = 8 × 10 ⁶ [H]
^-1 ; R2 = 2.2 × 10 ⁴ [H] ⁻¹ , R3 = 2.3 ×
10 ⁴ [H] ^{−1 and} , in the equivalent circuit of FIG. 9, 2R
3 + R2 = 6.8 × 10 ⁴ [H], and 2R3
Since + R2≪R1, R1 can be ignored.

On the other hand, the connecting member 32 in FIG. 5 has a structure in which the radio wave shielding performance is emphasized, so that the contact area of the surface contact is reduced and the tightening pressure by the joining screws 5A and 5B is strongly applied on the contact surface. Therefore, in terms of a magnetic circuit, the magnetic resistance at the contact surface increases, and d = 3.2.
When [mm], R3 = 10 ⁻³ / (4π × 10 ⁻⁷ × 3.2 × 10 ⁻³ ) = 1 / (1.3π × 10 ⁻⁶ ) = 2.4 × 10 ⁵ Still, since it is one digit smaller than R1,
One can be ignored. As described above, according to each of the above-described embodiments, a radio wave / magnetic shield room by forming a panel can be easily realized with high performance.

[0086] To be further mentioned, FIG.
In FIG. 5, magnetic shield plates 12 are provided on both sides of the panel body 11 of the wall panel.
Since this double structure is parallel as a magnetic circuit, the characteristic magnetic resistance R0 of the main line becomes "R0 / 2", which indicates that the shielding performance is greatly improved.

[Radio Wave Shield] In order to perform radio wave shielding (ie, electromagnetic wave shielding), it is necessary that a space requiring shielding be closed by a metal member having excellent conductivity. However, also in this case, it is impossible to close the space with a continuous metal member like the magnetic shield, and a seam is required. For the seam, although the method using soldering or welding can be expected to provide the most reliable shielding effect, it takes a very long time as a construction method and also involves the danger of fire, etc., because it involves heat.

On the other hand, the panel construction method has the feature of avoiding these difficulties. However, since the panels are connected to each other by bolts or the like, the contact resistance between adjacent joints increases, and a gap is generated. In addition, the shielding effect against high-frequency electromagnetic waves is deteriorated. FIG. 10 is a cross-sectional view showing a case where two adjacent panels are joined by two flat plates. In FIG. 10, it is generally known that the thinner the connecting member 2 'and the wider the interval between the joining bolts or screws, the worse the shielding effect. here,
Reference numeral 13 'denotes a radio wave shield plate, and reference numeral 11 denotes a panel body similar to that of FIG.

Therefore, in the above embodiment, as shown in FIG. 1, the connecting member 2 is provided with a folded portion 2A to prevent a small gap generated when the joining screws 5A and 5B are tightened, and the tightening force reduces the contact resistance. So that it works effectively. Further, in the embodiment shown in FIGS. 5 and 6 described above, the connecting member 2 of FIG. 1 is used upside down so that the folded portion 32a allows the fastening force of the joining screws 5A and 5B to be suspended in a small area. The contact resistance of the joint is remarkably reduced.

Here, the influence of the contact resistance between the joining members and the shielding effect such as opening of the connecting member 2 'as shown in FIG. 11 will be described in detail. FIG. 11 is a partial cross-sectional view as seen from the direction of arrow M in FIG.

Now, in the shielded room, the characteristic admittance of the outdoor free space at the junction is Y0, and the indoor side is Y0.
And the conductance and susceptance derived from the fastening of members at the joint by screws are G and B, respectively, the equivalent circuit for electromagnetic waves at the joint is
It can be represented almost as shown in FIG. The conductance G is the reciprocal of the contact resistance R, and the susceptance B is shown in FIG.
This is a susceptance depending on the length a of the mouth caused by opening of the mouth due to the bending of the connecting member 2 ′ shown in FIG.

Here, in order to briefly explain the effectiveness of the above-described embodiment, if Y 0 ′ = Y 0 and conductance G and susceptance B are values normalized by Y 0, the power transmission coefficient showing the shielding effect 1T1 ² is represented by 1T1 ² = 4 (1 + G) / [(2 + G) ² + B ² ]. Here, “1T1” indicates the absolute value of T (the same applies hereinafter).

Since the conductance G and the susceptance B in this equation are based on the admittance generated between the screws of the joining screw, when the susceptance B exists, the conductance G is no longer the contact conductance but the contact conductance. It should be considered as the input conductance, and when the susceptance B does not exist, the conductance G is considered as the contact conductance.

Now, assuming that the susceptance B = 0, 1T1 ² = [4 (1 + G) / (2 + G) ² ] / [4 / (12 + G)] (G → large)... because become, shielding effect will be large enough 1T1 ² is small. This indicates that more 1T1 ² decreases conductance G is large. Since the conductance G is the reciprocal of the contact resistance R, if “R → small”, “G → large”.

That is, the folded portion 2A provided in the connecting member 2 of FIG. 1 in this embodiment exhibits an effect to prevent the generation of the susceptance B due to the tightening of the screw.
Further, in FIG. 5, since the tightening force is concentrated on the protruding portion 32a provided at the end, the conductance G can be further increased, and "1T1 ² → 0" can be approached, so that the shielding performance is improved. Also, the connecting member 3 in FIG.
The third partition plate (horizontal rib) 33Ab is provided to keep susceptance B, which is likely to be generated by screwing with the bolt 5A, at zero.

[0085]

According to the present invention, the magnetic shield plate and the radio wave shield plate are provided on both sides of the panel main body, and have a double structure as a whole. When a shield room is formed by using this, the magnetic shield and the radio wave shield can be extremely effectively formed inside and outside the shield room.

Further, since the shield panel itself is formed in a thick plate shape with the lightened panel body interposed therebetween, the shield panel itself can be self-supported. Is not required, and not only the construction work for the facility can be performed efficiently, but also the area occupied by the outer wall portion of the shield room is reduced, so that the entire shield room can be downsized.

Further, when the shield panel is connected using the connecting member, the connecting member is provided so as to cover the connecting portion. For example, it is possible to perform adjustment by providing a gap between the shield panels of the connecting portion. Therefore, assembly adjustment on site can be smoothly performed. For this reason,
An unprecedented superior shield panel assembly that can perform assembly work of a shield room efficiently and can perform work of magnetic shield and radio wave shield at once, so that work can be done quickly and reliably. Can be provided.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing a first embodiment of the present invention.

FIG. 2 is a partially omitted front view viewed from an arrow K side in FIG. 1;

3 is a partial cross sectional view of a connecting corner portion of the disclosed shielded panel assembly (structure of the corner area of the shielded room) in FIG.

4 is a schematic diagram illustrating an example of a shielded room formed on the basis of the shield panel assembly disclosed in FIG. FIG. 2 is a partial sectional view showing the first embodiment of the present invention.

FIG. 5 is a partial cross-sectional view showing a second embodiment of the present invention.

FIG. 6 is a partially omitted front view viewed from an arrow K side in FIG. 5;

FIG. 7 is an explanatory diagram for explaining the principle of the magnetic shield; FIG. 7A is an explanatory diagram showing a closed space of the magnetic shield;
FIG. 7B is an explanatory view showing an example of the wall surface magnetic material in FIG. 7A.

8A and 8B are explanatory views showing a connection state of wall surfaces for explaining the principle of a magnetic shield; FIG. 8A is an explanatory view showing a case where magnetic shield plates are overlapped and connected; FIG. 8B is a magnetic shield plate; FIG. 6 is an explanatory diagram showing a state of a leakage magnetic flux generated when the ends of the above are butted with a gap therebetween.

FIG. 9 is an explanatory diagram showing an equivalent circuit when the magnetic circuit disclosed in FIG. 1 is electrically displayed.

FIG. 10 is an explanatory diagram for explaining the principle of the magnetic circuit disclosed in FIG. 1;

FIG. 11 is an explanatory diagram showing an example of a case where the connecting member in FIG. 10 is bent.

FIG. 12 is an explanatory diagram showing a schematic equivalent circuit with respect to electromagnetic waves at a joint in a shielded room having the structure shown in FIG. 10;

FIG. 13 is an explanatory diagram showing an example of a shield room in the related art.

[EXPLANATION OF SYMBOLS] 1 shield panel assembly 2,3,32,33 connecting member 4 the shield panel 5A, 5B bolt 11 panel body 12 a magnetic shield plate 13 electromagnetic shielding plate 32Ab, 33Ab partition plate S clearance

Claims (9)

[Claims] 1. A magnetic / radio wave characterized by comprising a honeycomb-structured, thick plate-shaped panel body made of a lightweight member, and a magnetic shield plate and a radio wave shield plate laminated on both sides of the panel body. Shield panel for shield room. 2. The panel body of the honeycomb structure having a thick plate shape formed of paper as a material.
The shield panel for the magnetic and radio shield room described. 3. The shield panel according to claim 1, wherein the magnetic shield plate is laminated inside the radio wave shield plate. 4. The magnetic shield plate member is formed of a magnetic member such as a silicon steel plate, and the radio wave shield plate is formed of a good conductive member such as copper or aluminum. 4. A shield panel for a magnetic or radio shield room according to 2 or 3. 5. The panel according to claim 1, wherein the radio wave shield plate is made of a zinc-coated iron plate. 6. A panel assembly for a magnetic / radio wave shielded room provided with a plurality of shield panels arranged on the same surface and connected by a connecting member, wherein the shield panel has a honeycomb structure made of a lightweight member. And a panel body formed in the shape of a thick plate, and a structure including a magnetic shield plate and a radio wave shield plate laminated on both sides of the panel body, respectively. A magnetic / radio wave shield, which is provided along the abutting portion of each shield panel so as to cover the abutting portion of the shield panel, and the connecting member is formed of a magnetic member having conductivity. Room panel assembly. 7. The panel assembly according to claim 6, wherein the connecting member is formed of a long member having a U-shaped cross section. 8. The panel assembly according to claim 6, wherein the connecting member is formed of a strip-shaped long member. 9. The connection member according to claim 6, wherein the connection member is formed of an iron plate coated with zinc.
A panel assembly for a magnetic / radio-shielded room as described.