JP2919263B2 - Screening equipment for anechoic chamber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring the radiated noise electric field strength of a device which generates noise which causes electromagnetic interference to other devices, or for testing a malfunction by irradiating an electronic device with a strong electromagnetic field. TECHNICAL FIELD The present invention relates to a screen anechoic chamber partitioning device for closing an entrance (opening) of an anechoic chamber used for such purposes without impairing the characteristics of the anechoic chamber.

[0002]

2. Description of the Related Art An opening is provided in a side wall of an anechoic chamber to allow the anechoic chamber to enter and exit from the outside and to carry in and out equipment, and a door is attached to the opening to be openable and closable.
Regarding the installation of the radio wave absorber at the door portion, a method of attaching the radio wave absorber to the indoor side of the door portion was generally used.

FIG. 8 shows a conventional example of a structure of a door portion of the anechoic chamber. The figure shows an opening (entrance) 2 of an anechoic chamber 1,
Side wall 3 provided with this opening 2, door 7 for opening and closing opening 2
4A and 74B, and their peripheral parts are shown. A metal shield plate 4 is attached on the entire inner surface (the floor surface, the ceiling surface, and the inner surface of the side wall 3) of the outer shell structure for constituting the anechoic chamber 1 in order to prevent leakage and intrusion of radio waves. Wall radio wave absorbers 5 are attached to the four inner side walls and the ceiling. On the outer surface (outdoor side) of the side wall 3, an extension wall 71 projects so as to surround the opening 2, and the extension walls 7 on both sides of the opening 2.
At one end, a door support column 72 is erected from the floor surface. The door support 74 has a door 74A,
74B are openably and closably attached to each other to form a double door (double door). The doors 74A and 74B are made of metal which also serves as a metal shield plate, or a metal shield plate is adhered on the inner surface, and further, door portion radio wave absorbers 75A and 75B are adhered on the inner surface. Have been. In addition, the extension wall 71 and the support column 72 for the door
In order to prevent leakage and intrusion of radio waves, they are made of metal and also serve as a metal shield, or a metal shield plate is stuck on the inner surface.

The solid line in FIG. 8 shows a state where the doors 74A and 74B are open, and the dotted line in the figure shows a state where the doors 74A and 74B are closed. The radio wave absorber 75B of one door 74B
Are cut out so as not to obstruct the opening and closing of the doors 74A and 74B as shown by hatched portions 76 in FIG.

[0005]

The electromagnetic wave absorbing structure for an anechoic chamber is composed of (1) an electromagnetic wave made of a foamed dielectric material containing graphite as an ohmic loss member on the inner surface of a metal shield plate attached to a wall surface. One that only has an absorber,
(2) A ferrite tile is stuck on the inner surface of a metal shield plate stuck on the wall surface, and a radio wave absorber made of a foamed dielectric containing graphite, which is an ohmic loss body, is arranged on the inner surface of the ferrite tile. (3) In some cases, a ferrite tile is attached to the inner surface of a metal shield plate attached to the wall.

The prior art shown in FIG. 8 has the above-mentioned radio wave absorbing structure (1). In the above-mentioned cases (1) and (2), the foamed dielectric material containing graphite as an ohmic loss body is used. The thickness of the radio wave absorber made of is about 1 m. When such a radio wave absorber is attached to the door of the anechoic chamber, the door is set at an angle close to 180 ° in order to obtain a sufficient effective opening width when the test equipment and the like are carried in and out of the anechoic chamber. Need to open. Further, the hinge position for opening and closing the door having such a structure must be installed outside the outer shell structure (side wall 3) of the anechoic chamber, and as shown in the conventional example of FIG. , 74B also have a structure protruding outside from the side wall surface. Therefore, the radio wave absorbers 75A and 75B in the door portion are retracted with respect to the radio wave absorber 5 on the side wall surface, and a step D is formed on the surfaces of the wall radio wave absorber 5 and the door radio wave absorbers 75A and 75B. However, there is a disadvantage that reflection due to impedance mismatch easily occurs and good characteristics cannot be obtained. Further, as shown in FIG. 8, it is necessary to cut out a part of one radio wave absorber 75B in order to open and close the doors 74A and 74B, which causes the characteristic of the radio wave anechoic chamber 1 to deteriorate.

FIG. 8 shows an example of a double door, but the same problem also occurs in the case of a single door, due to a step and a cutout of the radio wave absorber.

In view of the above, the present invention provides a screen anechoic chamber partitioning device which prevents the deterioration of the anechoic chamber characteristics by improving the opening / closing structure of the opening of the anechoic chamber and the installation structure of the radio wave absorber. The purpose is to do.

[0009]

In order to achieve the above object, a partitioning device for an anechoic chamber according to the present invention includes an ohmic loss body.
Electromagnetic anechoic provided with foamed dielectric containing wall as radio wave absorber
The opening of the side wall of the room can be closed, and the wall
A moving partition having moving means and having a section wave absorber and the wave absorber of the same material, the movement within the anechoic chamber
A second guiding the partition in a direction perpendicular to the side wall having the opening;
A first guide portion and a second guide portion forming a predetermined angle with respect to the first guide portion;
It has a guide portion and is provided on the floor surface in the anechoic chamber.
Guiding means, and the moving screen further comprises:
From the state in which the moving means moves along the first guide portion,
Direction to change to a state of moving along the second guide portion
It has a conversion mechanism .

Further, the moving means is a bogie having wheels.
The direction change mechanism jacks up the moving screen.
It is good also as a structure which changes the direction of the said wheel by pushing .

Alternatively, the moving means may be the first guide portion.
To the first wheel and the second guide portion that are movable
And a second wheel movable along the
You may.

Further, the moving screen includes the moving means.
Driving device to be driven and movement for operating the driving device
And a drive source, wherein the driving device is an electric motor.
And a driving battery unit as the power source.
Good to be.

[0013]

According to the partitioning device for an anechoic chamber of the present invention, the opening of the side wall of the anechoic chamber can be closed by a moving partition having a moving means movable between a closed position and an opened position and a radio wave absorber. Therefore, when the opening is closed by the moving screen, a step is generated between the electromagnetic wave absorber of the moving screen located in the anechoic chamber and the electromagnetic wave absorber provided on the inner surface of the side wall around the opening. There is no need to provide a cutout in the radio wave absorber as in the conventional example, and by closing the opening with the moving partition, the same radio wave absorption performance as the surrounding radio wave anechoic chamber wall surface can be obtained.

In a case where guide means is provided on the floor surface in the anechoic chamber and the moving screen is moved along the guide means by the moving means, the movement is restricted to movement within a predetermined position. The partition can be moved accurately and smoothly. Therefore, the radio wave absorber is not damaged when the mobile partition moves.

In the case where the moving screen is provided with a driving device (motor) for driving the moving means and a power source (battery) for operating the driving device, the movement of the moving screen is automated. be able to. For example, if you operate an electric motor with a built-in battery,
The power line-related drag such as a motor drive line can be eliminated, and accidents such as power line disconnection and short circuit can be prevented.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a partitioning apparatus for an anechoic chamber according to the present invention.

1 to 5 show a first embodiment of the present invention. FIG. 1 shows an opening (entrance) 2 of an anechoic chamber 1 and this opening 2
Doors 14A and 14 for opening and closing the side wall 3 provided with
B, the mobile screen 10 with the radio wave absorber, and its peripheral portion. A metal shield plate 4 is stuck on the entire inner surface (the floor surface, the ceiling surface, and the inner surface of the side wall 3) of the outer shell structure for constituting the anechoic chamber 1 for preventing electromagnetic wave leakage and intrusion. Further, the wall radio wave absorber 5 is attached (adhered) to the four inner side wall surfaces and the ceiling surface. The wall radio wave absorber 5 is a foamed dielectric containing graphite or the like as an ohmic loss body. In order to efficiently absorb radio waves, for example, a mountain-shaped section having a three-peak cross section is provided on the top of a square base. On the side wall surface and the ceiling surface, a large number of wall radio wave absorbers 5 are alternately arranged and pasted. Note that a ferrite tile, which is a flat radio wave absorber, may be laid on the floor 6.

On the outer surface (outdoor) side of the side wall 3, an extension wall 11 projects so as to surround the opening 2, and at the ends of the extension walls 11 on both sides of the opening 2, door posts 12 stand upright from the floor surface. Have been. The door support 12 has a door 1 through a hinge 13.
4A and 14B are attached to be openable and closable, respectively. The doors 14A and 14B open and close at least about 90 ° with double-opening (double doors) (180 ° is open in FIG. 1). The doors 14A and 14B are made of metal that also serves as a metal shield plate for preventing leakage and intrusion of radio waves, or have a metal shield plate adhered to the inner surface thereof. In order to prevent leakage and intrusion of radio waves, they are made of metal and also serve as a metal shield, or a metal shield plate is stuck on the inner surface.

A parallel rail 7 is provided on the floor 6 in the anechoic chamber 1 as guide means for defining a moving path of the moving partition 10 with the radio wave absorber. The parallel rail 7 extends vertically (as a right angle) from the outside of the opening 2 in the side wall 3 into the anechoic chamber 1 as a first guide portion laid (or buried) on the side wall 3 in a vertical direction. Moving rail 7A
And a lateral moving rail portion 7B as a second guide portion laid (or buried) in parallel with the side wall 3 in the anechoic chamber 1 and connected at a right angle to the vertical moving rail portion 7A. It consists of

As shown in FIGS. 2 to 4, the moving partition 10 with the radio wave absorber is mounted on a hollow base 21 having a rectangular parallelepiped shape.
2 is a metal (for example, steel) partition frame 24 formed by standing and fixed, and a movement that is arranged in the inner storage portion of the pedestal 21 having an open bottom surface and moves along the rail portions 7A and 7B. 5 having two pairs of wheels 25 as means. The wheel 25 is similar to a wheel of a railway vehicle, and has a flange 47 so as to run and move along the inner edges of the rails 7A and 7B. Rail part 7A fixed to the floor 6 of the anechoic chamber,
7B may be the same as a railroad rail, or may be a prismatic member or a timber.

The vertical plate-like partition portion 22 of the metal partition frame 24 has a back surface (opposite the surface facing the inside of the anechoic chamber).
Are supported and fixed (reinforced) by support portions 27 which are erected and fixed to the pedestal 21, and are provided on the four side walls and the ceiling surface of the anechoic chamber 1 on the entire surface facing the anechoic chamber side. (A material, shape and dimensions are the same)
8 are stuck alternately side by side. In the closed state (the installation state at the time of the test in which the opening 2 was closed) when the moving screen 10 with the electromagnetic wave absorber was installed as shown by the solid line in FIG. It is provided so as not to cause a step on the surface with respect to the wall radio wave absorber 5.

Further, a ferrite tile as a flat electromagnetic wave absorber is provided on at least the upper surface and the side surface of the pedestal 21, which is a metal portion protruding into the anechoic chamber (facing the anechoic chamber side) beyond the partition portion 22. 29 is pasted.

At the four corners of the pedestal 21, jack-up portions 31 are provided. The jack-up portion 31 is configured to expand and contract in a vertical direction by a hydraulic drive source (not shown) provided in the pedestal 21. Then, by the extension of the jack-up portion 31, the partition frame 24 having the electric bogie 26 attached to the inside of the pedestal 21 is lifted upward from the floor surface (jacked up).
It has become. The jack-up portion 31 is required for a direction changing operation of the electric bogie 26 described later.

On the bottom side of the pedestal 21, a bogie position detecting sensor 32 as shown in FIG. 3 is used to detect a turning position 61 where the vertical moving rail 7A and the horizontal moving rail 7B intersect. Is provided. The bogie position detection sensor 32 is, for example, a limit switch operated by a member on the floor surface 6 side.

Further, on the pedestal 21 on the back side of the partition 22, the electric bogie 26, the jack-up portion 31, and a mechanism for turning the electric bogie (a hydraulic cylinder 44 for bogie rotation shown in FIG. 5 described later) are controlled. And a driving battery unit 34 as a power source (power source) of the electric carriage 26 are mounted (fixed). On the front surface of the control unit 33, an operation panel 35 for operating the electric partition 26, the jack-up unit 31, and the hydraulic partition 44 for driving the mobile partition 10 with the radio wave absorber is provided.

As shown in FIG. 5, the electric bogie 26 has a bogie frame 41, and axles 46A and 46B are rotatably mounted at front and rear ends thereof, respectively.
Wheels 25 are fixed to both ends of 46B, respectively.
The two pairs of wheels 25 are provided with flanges 47 (in order to move along the rails) inside to prevent derailment from the rails 7A and 7B. At the rear of the bogie frame 41, an electric motor 48, which is a driving device that receives power from the driving battery unit 34 to rotate the wheels 25, and a speed reducer 49 connected to a rotation shaft of the electric motor 48 are provided. Installed and fixed. Sprockets 50 and 5 are attached to the output shaft of the reduction gear 49 and the rear axle 46B.
1 are respectively fixed, and both sprockets 50, 51
A chain 52 is stretched between them, and these form a winding transmission mechanism. Furthermore, the front and rear axles 4
Sprockets 53 and 54 are also fixed to 6A and 46B,
A chain 55 is stretched between them so that both axles 4
6A and 46B rotate in the same direction. Accordingly, the rotational force of the electric motor 48 is reduced by the speed reducer 49, transmitted to the axle 46B via the winding transmission mechanism of the sprockets 50, 51 and the chain 52, and further transmitted to the axle 46B of the sprockets 53, 54 and the chain 55. Through the axle 46A, and simultaneously rotates the two pairs of wheels 25 in the same direction.

The electric bogie 26 has a mounting portion 42 rotatably mounted at the center of a bogie frame 41, and the mounting portion 42 is fixed to the bottom of the partition frame 24 so that the electric bogie is Reference numeral 26 is attached to the partition frame 24 so as to be rotatable about a point P. Then, the direction of the electric cart 26, that is, the direction of the two pairs of wheels 25 is set to 90
A bogie rotating hydraulic cylinder 44 is provided between the bogie frame 41 and the partition frame 24 (inside the pedestal 21) as a direction changing mechanism for changing the angle. That is, one end of the bogie rotating hydraulic cylinder 44 is connected to the partition frame 24 (inside the pedestal).
The other end is pivotally connected to a cylinder mounting bracket 43B fixed to the center cross member 45 of the bogie frame 41. The bogie rotating hydraulic cylinder 44 is provided with a hydraulic drive source (for example, the jack-up unit 3) provided on the partition frame 24 side.
(Combined with the first hydraulic drive source). As shown in FIG. 5, the bogie rotating cylinder 44 is contracted when the electric bogie 26 is on the rail 7A for vertical movement, and the tip end position of the piston rod is in the shortened state X1.
When the electric bogie 26 is on the rail 7B for lateral movement, it is extended and the tip end position of the piston rod is extended X2.
become.

As described above, when the partition frame 24 of the movable partition 10 with the radio wave absorber is lifted from the floor by the jack-up member 31 (during jack-up), the electric bogie 26 expands and contracts the bogie rotating cylinder 44. As a result, the pedestal 21 is rotated by 90 °, so that the traveling direction can be changed from a direction perpendicular to the side wall 3 of the anechoic chamber 1 to a direction parallel thereto or vice versa.

Here, the operation of the anechoic chamber partitioning device of the first embodiment will be described. When carrying the test object or equipment into or out of the anechoic chamber 1, the doors 14 </ b> A and 14 </ b> B of FIG. 1 are opened, and the operation panel 35 of the control unit 33 is operated to operate the electric motor 48 of the electric carriage 26. Start, Figure 1
As shown by the solid line, the moving screen 10 with the radio wave absorber, in which the wheel 25 is located at the closed state stop position 62 and closes the opening 2 of the side wall 3, is placed on the rail 7A for vertical movement in a direction perpendicular to the side wall 3 first. Is moved and moved toward the direction change position 61.

When the bogie position detecting sensor 32 of the moving screen 10 with the radio wave absorber detects the direction change position 61,
The electric motor 48 is stopped by the control unit 33, and the moving screen 10 with the radio wave absorber is stopped so that the wheel 25 of the electric bogie 26 is located at the direction change position 61.

At the direction change position 61, the control unit 33 controls the hydraulic drive source to extend the jack-up unit 31,
The partition frame 24 of the movable partition 10 with the radio wave absorber is lifted up with respect to the floor 6 together with the electric bogie 26, and the wheels 25 are detached upward from the rail 7A for vertical movement. In this jack-up state, the hydraulic drive source is controlled by the control unit 33 to extend the bogie rotating cylinder 44 in FIG. 5 to change the bogie rotating cylinder 44 from the shortened state X1 to the extended state X2, and to set the electric bogie 26 into a partition. 9 right to frame 24
Rotate 0 °.

Next, the hydraulic drive source is controlled by the control unit 33 to contract the jack-up unit 31, and the partition frame 24 of the mobile partition 10 with the radio wave absorber is moved relative to the floor 6 by the electric bogie 26.
The wheel 25 is landed along the rail 7B for lateral movement. Then, the electric motor 48 is started again by the control unit 33, and the moving screen 10 with the radio wave absorber moves on the rail 7B for lateral movement in the direction parallel to the side wall 3.

When the bogie position detecting sensor 32 detects the open stop position 63, the control unit 33 controls the electric motor 48.
Is stopped, and each wheel 25 of the mobile screen 10 with the radio wave absorber stops at the open state stop position 63. And open opening 2
The test object and the equipment are carried into or out of the anechoic chamber 1 from the above.

When the operation of the operation panel 35 and the start of the electric motor 48 of the electric trolley 26 after the loading or unloading of the device under test, the equipment, etc., the moving screen 10 with the radio wave absorber is started.
Moves on the lateral movement rail portion 7B toward the direction change position 61, and the operation and movement are performed in the reverse order by the control unit 33, and the moving screen 10 with the radio wave absorber is closed at the stop position. The operation of returning to 62 is performed.

It is to be noted that the above operation of the moving panel 10 with the radio wave absorber from the closed state stop position 62 to the open state stop position 63 or from the open state stop position 63 to the closed state stop position 62 is performed by operating the operation panel 35. Then, it is automatically executed by the control unit 33.

According to the first embodiment, the following effects can be obtained.

(1) The opening 2 of the side wall 3 of the anechoic chamber 1 is made freely closable by the moving screen 10 provided with the radio wave absorber 28 provided with the radio wave absorber 28. When the opening 2 is closed, the radio wave absorber 28 and the wall are closed. In order to match the position of the surface with the electromagnetic wave absorber 5, FIG.
In the conventional structure, the step of the radio wave absorber at the opening 2 can be eliminated, and there is no need to provide a cutout for reducing the thickness of the radio wave absorber 28 for opening and closing the doors 14A and 14B. Good radio wave absorption characteristics can be maintained (the same radio wave absorption characteristics as the wall around the opening can be obtained).

(2) Since the moving partition 10 with the radio wave absorber is used to close the opening 2 of the side wall 3, it is not necessary to attach a thick radio wave absorber to the doors 14A and 14B, and the conventional radio wave absorber (1 m thick) is used. Door 14A,
14B can be easily and smoothly opened and closed.

(3) Since it is not necessary to attach a thick radio wave absorber to the door 14, it is necessary to open the door as in the conventional structure in order to secure an effective opening width for loading and unloading the device under test and equipment. Since the angle does not need to be around 180 °, and an opening angle of about 90 ° is sufficient, the structure of the door can be simplified, and the space for opening the door can be reduced.

(4) When loading / unloading a device under test or equipment,
The mobile partition 10 with the radio wave absorber having the wheels 25 can be quickly and smoothly moved between the closed position and the open position by using the parallel rails 7, so that the mobile partition 10 with the radio wave absorber can be handled without feeling inconvenience. It becomes possible (the movement of the mobile partition 10 with the radio wave absorber can be automated). Further, since the moving screen 10 with the radio wave absorber is accurately guided to the opening 2 of the side wall 3 by the wheels 25 and the rails 7, the radio wave absorber 25 of the moving screen 10 with the radio wave absorber and the wall radio wave absorber around the opening are provided. No damage occurs to 5.

When the material of the radio wave absorber 28 used in the mobile partition 10 with the radio wave absorber is a foamed dielectric material containing graphite as an ohmic loss body as in the first embodiment (using a ferrite tile together) If not) a tree,
The partition frame 24 may be formed of a structure other than metal such as resin.

FIG. 6 shows a second embodiment of the present invention. In this case, the ferrite tile 80 is provided behind the radio wave absorber 5 provided on the four side walls and the ceiling surface of the anechoic chamber 1 and the ferrite tile 80 is also provided behind the radio wave absorber 28 of the mobile partition 10 with the radio wave absorber. 81 are provided. That is,
A metal shield plate 4 is attached to the entire inner surface (the floor surface, the ceiling surface, and the inner surface of the side wall 3) of the outer shell structure for constituting the anechoic chamber 1 in order to prevent leakage and intrusion of radio waves. Ferrite tiles 8 on 4 inner side walls and ceiling
0 are pasted (glued) and their ferrites
On the inner surface of the tile 80, a wall radio wave absorber 5 made of a foamed dielectric containing graphite as an ohmic loss body is attached (adhered). Further, a ferrite tile 81 is attached (adhered) to the entire surface of the indoor side surface of the metal partition portion (also serving as a metal shield plate) 22 of the metal partition frame 24 included in the moving partition 10 with the radio wave absorber. A radio wave absorber 28 made of a foamed dielectric containing graphite, which is an ohmic loss body, is attached (adhered) to the inner surfaces of the ferrite tiles 81. The other configuration is the same as that of the first embodiment.

According to the second embodiment of FIG. 6, in addition to the effects of the first embodiment, the use of the ferrite tiles 80 and 81 together with the dielectric wave absorbers 5 and 28 further enhances the wave absorption effect. Can improve.

FIG. 7 shows a third embodiment of the present invention. In this case, the mobile screen with a radio wave absorber 10 has two pairs of wheels 25 and 25A which are different from each other by 90 °. That is, the wheel 25 is moved along the vertical moving rail portion 7A of the parallel rail 7 shown in FIG.
The wheel 25A having a direction different from that of the wheel 25A by 90 ° functions as a moving unit for moving the moving screen 10 with the radio wave absorber along the rail 7B for lateral movement. In addition, these wheels 25 and 25A can protrude alternately from the bottom of the partition frame 24, and the jack-up portion is not required. The other configuration may be the same as that of the first embodiment.

In the third embodiment shown in FIG. 7, the moving screen 10 with the radio wave absorber at the closed position where the opening of the side wall of the radio wave anechoic chamber is closed is first moved to the wheel 25 projecting from the bottom of the screen frame 24. Fig. 1 in the direction perpendicular to the side wall using
Is moved toward the direction change position along the vertical moving rail portion 7A. When the moving screen 10 with the radio wave absorber arrives at the direction change position 61, the wheel 25 is retracted, and then the different wheel 25A oriented at 90 ° is protruded to move along the rail 7B for lateral movement. 10 is moved toward the open stop position. The movement of the mobile partition with a radio wave absorber 10 from the open state stop position to the closed state stop position can be executed by the reverse operation. Other functions and effects are the same as those of the first embodiment.

In the first and second embodiments, the door has a double-opening structure having the doors 14A and 14B. However, the door may have a single-sided structure. In this case, the width and the rail of the mobile partition with a radio wave absorber 10 can be changed according to the door.

Further, in the first embodiment, as the direction changing mechanism of the moving screen 10 with the radio wave absorber at the turning point 61, the jack-up unit 31 uses the moving screen 10 with the radio wave absorber.
In the state where the partition frame 24 is jacked up, the bogie rotating cylinder 44 rotates the electric bogie 26 with the bogie frame 41 by 90 ° with respect to the partition frame 24. A structure in which each wheel 25 is rotated by 90 ° in a fixed state may be adopted.

If there is room in the internal space of the anechoic chamber 1, the connecting portion of the parallel rails may be formed in an arc shape to change the direction without jacking up the moving screen with the radio wave absorber.

In each of the above embodiments, a parallel rail is used as guide means for moving the moving screen 10 with the radio wave absorber between the opening 2 of the side wall 3 and the inside of the radio wave anechoic chamber 1.
The number of rails can be changed as appropriate, and the structure of the bogie can be changed according to the rails. Further, as a guide means other than the rail, a guide groove for guiding the wheels 25 may be provided on the floor surface.

It is to be noted that a configuration other than a combination of wheels and rails (guide grooves) can be employed as a moving means of the mobile partition with a radio wave absorber, and a configuration other than an electric motor is also employed as a driving device for driving the moving means. can do.

The doors 14A and 14B are omitted by using the partition frame 24 of the moving partition 10 with the radio wave absorber used in each of the above embodiments as a metal shield plate for preventing leakage and intrusion of radio waves. Or other shielding means such as a curtain for shielding electromagnetic waves.

Although the embodiments of the present invention have been described above, it is obvious to those skilled in the art that the present invention is not limited to the embodiments and various modifications and changes can be made within the scope of the claims. Would.

[0053]

As described above, the partitioning device for an anechoic chamber according to the present invention comprises a foamed dielectric material including an ohmic loss body.
Closes the opening of the side wall of the anechoic chamber provided as an electromagnetic wave absorber
Possible and the same material as the wall radio wave absorber on the indoor side surface
Moving device having a radio wave absorber and moving means
The moving screen is provided in the anechoic chamber by the guide means.
At one guide, guide in a direction perpendicular to the side wall with the opening.
At the second guide part in a direction making a predetermined angle with this.
And so as to guide, when closing the opening by the moving partition, a wall wave absorber is provided on the side wall inner surface of the wave absorber and the opening periphery of the moving partition located anechoic chamber inside It is possible to dispose the moving partition without generating a step between them, and it is not necessary to provide a cutout for partially reducing the thickness of the radio wave absorber as in the related art. A radio wave absorption performance similar to that of a wall surface can be obtained, and a radio wave anechoic chamber having excellent characteristics can be realized. In addition, there is no need to provide a radio wave absorber at the door, the door can be opened and closed smoothly, the opening angle of the door can be about 90 °, and the door structure can be simplified.

[Brief description of the drawings]

FIG. 1 is a plan sectional view showing a first embodiment of a screen device for an anechoic chamber according to the present invention.

FIG. 2 is a right side view showing a mobile partition with a radio wave absorber in the first embodiment.

FIG. 3 is a front view of the same.

FIG. 4 is a plan view of the same.

FIG. 5 is a plan view showing the electric bogie in the mobile partition with the radio wave absorber of the first embodiment.

FIG. 6 is a plan sectional view showing a second embodiment of the present invention.

FIG. 7 is a plan view showing a mobile partition with a radio wave absorber and a parallel rail according to a third embodiment of the present invention.

FIG. 8 is a plan sectional view showing a structure of a door portion of a conventional anechoic chamber and its surroundings.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 anechoic chamber 2 opening 3 side wall 4 metal shield plate 5 wall radio wave absorbing body 6 floor surface 7A vertical moving rail 7B lateral moving rail 10 moving screen with radio wave absorbing body 14A, 14B, 74A, 74B door 21 pedestal DESCRIPTION OF SYMBOLS 22 Screen part 24 Screen frame 25, 25A wheel 26 Electric trolley 28 Radio wave absorber 29, 80, 81 Ferrite tile 31 Jackup part 32 Dolly position detection sensor 33 Control part 34 Drive battery part 41 Dolly frame 44 Dolly rotation Cylinder 46A, 46B Axle 47 Flange 48 Electric motor 49 Reducer 61 Direction change position 62 Closed stop position 63 Opened stop position

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H05K 9/00

Claims (5)

(57) [Claims] 1. A foam dielectric comprising an ohmic loss body comprising a wall.
Closes the opening of the side wall of the anechoic chamber provided as an electromagnetic wave absorber
Possible and the same material as the wall radio wave absorber on the indoor side surface
Side walls having a moving screen, the openings of the moving screen in the anechoic chamber with a moving means which has a wave absorber
Guide portion for guiding in a direction perpendicular to the first and the first guide portion
A second guide portion forming a predetermined angle with respect to
Guide means provided on a floor surface in an anechoic chamber, further comprising:
From the state of moving along the minute along the second guide part
A partitioning device for an anechoic chamber, comprising a direction changing mechanism for changing to a moving state . 2. The vehicle according to claim 2, wherein said moving means is a bogie having wheels.
The direction change mechanism jacks up the moving screen
2. The partitioning device for an anechoic chamber according to claim 1 , wherein the direction of the wheel is changed . 3. The apparatus according to claim 1, wherein said moving means is provided along said first guide portion.
Moving along the first wheel and the second guide portion,
2. The anechoic chamber partitioning device according to claim 1 , further comprising a movable second wheel . 4. The anechoic chamber partitioning device according to claim 1 , wherein said moving partition comprises a driving device for driving said moving means, and a power source for operating said driving device. 5. The apparatus according to claim 1, wherein said driving device has an electric motor.
Claims: A driving battery unit is provided as the power source.
4. The screen partitioning device for an anechoic chamber according to 4 .