JP2853080B2 - Door structure 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. More particularly, the present invention relates to a door structure for an anechoic chamber using a dielectric type electromagnetic wave absorber or a composite type electromagnetic absorber of a dielectric and a ferrite.

[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 equipment in and out of the anechoic chamber. 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. 7 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,
A side wall 3 provided with the opening 2 and a door 1 for opening and closing the opening 2
4A and 14B 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. A wall radio wave absorber 5, which is a dielectric radio wave absorber, is attached to the four inner side wall surfaces and the ceiling surface. On the outer surface (outdoor side) of the side wall 3, an extension wall 11 projects so as to surround the opening 2.
Are erected from the floor, respectively. Doors 14A and 14B are attached to the door support 12 via hinges 13 so as to be openable and closable, and a swing type double door (double door).
Is composed. The doors 14A and 14B are made of metal which also serves as a metal shield plate, or have a metal shield plate adhered on the inner surface, and further have a door portion radio wave absorber which is a dielectric type radio wave absorber on the inner surface. 15A and 15B are pasted respectively. The extension wall 11 and the door support 12 are also made of metal and serve as a metal shield in order to prevent leakage and intrusion of radio waves, or a metal shield plate is affixed to the inner surface.

[0004] A solid line in FIG. 7 shows a state where the doors 14A and 14B are opened, and a dotted line in the figure shows a state where the doors 14A and 14B are closed. The radio wave absorber 15B of one door 14B
Are cut out so as not to obstruct the opening and closing of the doors 14A and 14B as shown by hatched portions 16 in FIG.

By the way, a radio wave absorbing structure for an anechoic chamber is as follows.
(1) A dielectric shield made of a foamed dielectric material containing graphite, which is an ohmic loss element, is placed on the inner surface of a metal shield plate attached to the wall. (2) A metal shield attached to the wall. A ferrite tile is attached to the inner surface of the board, 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 to form a composite radio wave absorber. 3) In some cases, ferrite tiles are attached to the inner surface of the metal shield plate attached to the wall.

Although the above-mentioned conventional example of FIG. 7 has the dielectric type electromagnetic wave absorbing structure of (1), the composite type electromagnetic wave absorber of (2) may be used in an anechoic chamber.

[0007] A method has also been proposed in which a radio wave absorber corresponding to the door position is not attached to the door, but is made into a screen, and is moved into a radio wave anechoic chamber.

[0008]

The above prior art has the following problems.

(1) As described above, the thickness of the dielectric type radio wave absorber or the composite type radio wave absorber of the dielectric and ferrite is about several tens cm or more. When such a radio wave absorber is attached to a swing type door portion of an anechoic chamber, it is necessary to cut out in accordance with the arc of the swing (for example, a hatched portion 16 in FIG. 7). There is a problem that radio wave absorption characteristics are deteriorated. In addition, installing a radio wave absorber on the wall of an anechoic chamber, which is equivalent to the arc-shaped cutout of the radio wave absorber at the door, is difficult to process the radio wave absorber, and furthermore, it is difficult to process the radio wave absorber, In terms of terms.

(2) In order to obtain a sufficient effective opening width when a device to be tested or the like is carried into or out of the anechoic chamber, it is necessary to open the door at an angle close to 180 °. The hinge position of the door having such a structure must be installed outside the outer shell structure (side wall) of the anechoic chamber. As shown in the conventional example of FIG. 7, the doors 14A and 14B also protrude outside the side wall surface. Structure. Therefore, when the doors 14A and 14B are closed, the radio wave absorbers 15A and 15B of the door portion are retracted with respect to the radio wave absorber 5 of the side wall surface, and the wall radio wave absorber 5 and the door radio wave absorber are retracted. There is a disadvantage that a step D is generated on the surfaces of 15A and 15B, and reflection due to impedance mismatch is likely to occur and good characteristics cannot be obtained.

(3) When moving in an anechoic chamber in the form of a screen without attaching the radio wave absorber to the door, the door is opened and closed when a test object, measuring equipment or personnel enters or exits, and the screen is moved each time. There are problems that it is time-consuming, that extra cost is required to construct a screen, and that this method cannot be used when the anechoic chamber is small.

SUMMARY OF THE INVENTION In view of the above, it is an object of the present invention to provide a door structure for an anechoic chamber in which the characteristics of the anechoic chamber are prevented from deteriorating by devising a door opening / closing structure for closing an opening of the anechoic chamber. And

[0013]

To achieve the above object, the first door for an anechoic chamber of the present invention uses a dielectric type radio wave absorber or a composite type radio wave absorber of a dielectric and a ferrite. When opening and closing the opening provided on the side wall of the anechoic chamber, a door provided with a dielectric type radio wave absorber or a composite type radio wave absorber of a dielectric and a ferrite on the indoor side surface of the door body capable of closing the opening. the example <br/> Bei and moving means for movable in a direction parallel to said side wall with the door on the outside of the anechoic chamber to be movable in a direction perpendicular to said side wall, said moving means, said Vertically fixed on the outside of the side wall
Fixed rail and the radio wave absorber on the door side
Push the fixed rail to the position where it does not touch the protruding part.
Movable rail that is movable in parallel with the side wall.
And movable to the movable rail and fixed to the door body
And a mounting tool provided .

In the first door for an anechoic chamber, a wheel running on the fixed rail is provided on the movable rail side, and a wheel running on the movable rail is provided on the fixture. preferable. In addition, the movable
Or a drive source that moves the door (eg, electric, oil
Pressure, pneumatic drive source).

[0015] The second door structure for an anechoic chamber according to the present invention is a dielectric anechoic chamber.
Body-type radio wave absorber or composite radio wave of dielectric and ferrite
Opens and closes the opening provided on the side wall of the anechoic chamber using the absorber
In the case, the opening of the door body that can close the opening
On the surface, use a dielectric type radio wave absorber or
A door provided with a combined electromagnetic wave absorber and the outside of the anechoic chamber
To move the door vertically in relation to the side wall
To move freely in the direction parallel to the side wall.
Means, wherein said moving means is perpendicular to said side wall and outward.
A vertical moving rail provided toward the
It is provided parallel to the side wall outside the dark room, and moves in the vertical direction.
Parallel direction connecting at right angles to the working rail
A moving rail and the vertical and parallel moving rails.
And wheels provided on the door body side so as to travel
And the rail for moving in the parallel direction absorbs radio waves on the door side.
When the collecting body does not touch the most protruding portion on the opening side, the door
Is movable. For the first or second anechoic chamber
In the door structure, a conductive finger contact may be provided around the opening, and a conductive knife-edge-shaped connection portion connected to the finger contact may be provided on the door body that is conductive at least on the indoor side.

[0016]

[0017]

In the door structure for an anechoic chamber of the present invention, a door provided with a dielectric type electromagnetic wave absorber or a composite type electromagnetic wave absorber of a dielectric and a ferrite in a door body is provided in a direction perpendicular to the outside of the side wall of the anechoic chamber. Since the support structure can be moved in a direction parallel to the side wall, that is, the movement for moving the door outside the room
A fixed rail vertically fixed to the outside of the side wall
And the thickness of the radio wave absorber with respect to the fixed rail
Movable (Do not touch the electromagnetic wave absorber on the door
Move freely to the position where it becomes
A movable rail and the door book movable with respect to the movable rail;
Since it was configured to have a fixture fixed to the body, the notch of the radio wave absorber necessary for the swing type door, the radio wave absorber on the wall side of the anechoic chamber and the radio wave absorber on the door side Can be eliminated, and the deterioration of the radio wave absorption characteristics due to them can be prevented. In addition, the door
There is no need for support to stand up,
Can be downsized. A wheel running on the fixed rail;
A wheel running on the movable rail on the movable rail side
Is provided on the fixture, the movable rail and
The door can be moved more smoothly. Or, said move
Means are perpendicular to the side wall and outwardly provided.
Direction moving rail and flat on the side wall outside the anechoic chamber.
At right angles to the vertical rail
A rail for parallel movement,
So that it travels on rails for vertical and parallel movement
A wheel provided on the door body side, and
As for the operating rail, the radio wave absorber on the door side is the
The door can be moved without touching the protrusion
In the same case, it was necessary for swing doors
Notch of radio wave absorber, radio wave absorber on the wall side in the anechoic chamber
And the step between the door and the radio wave absorber on the door side can be eliminated,
It is possible to prevent the deterioration of the radio wave absorption characteristics caused by them.
it can.

Further, by providing the same radio wave absorber as the wall of the radio wave anechoic chamber on the indoor side surface of the door, it is not necessary to separately install a partition or the like provided with the radio wave absorber.

[0019]

In a case where a conductive finger contact is arranged around the opening and a conductive knife-edge-shaped connecting portion for connecting to the finger contact is provided on the door body which is conductive at least on the indoor side, the opening-side conductive member is provided. By inserting and connecting the door-side conductive knife-edge-shaped connecting portion to the finger contact, the electromagnetic wave shielding of the opening of the anechoic chamber can be reliably performed.

Further, a drive source for moving the movable rail or the door (for example, an electric, hydraulic or pneumatic drive source)
When the door is provided, even if the door becomes large or the radio wave absorber is attached to make it heavy, the door can be moved smoothly, which is convenient for handling.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a door structure for an anechoic chamber according to the present invention will be described below with reference to the drawings.

FIGS. 1 to 4 show a first embodiment of the present invention. 1 and 2 show an opening (entrance) 2 of an anechoic chamber 1, a side wall 3 provided with the opening 2, and a door 3 for opening and closing the opening 2.
FIG. 3 shows a door 30 and its peripheral portion, and FIG. 4 shows a structural portion for shield connection of the door.

In these figures, an electromagnetic wave shield for preventing leakage and intrusion of radio waves is provided on the entire inner surface (the floor 6, the ceiling and the inner surfaces of the side walls 3) of the outer shell structure for forming the anechoic chamber 1 inside. For this purpose, a metal shield plate 4 is adhered, and further, a wall radio wave absorber 5 is adhered (adhered) to four inner side walls and a ceiling surface thereof. This wall radio wave absorber 5
Is a dielectric type radio wave absorber, which 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 having a cross section of three peaks above a square base is used. A large number of wall radio wave absorbers 5 are alternately alternately arranged and attached to each side wall surface and ceiling surface. Note that a ferrite tile, which is a flat radio wave absorber, may be laid on the floor 6.

A metal (conductive) rectangular door frame 20 is fixed to the side wall 3 so as to surround the rectangular opening 2 formed in the side wall 3 of the anechoic chamber 1. As shown in FIG. A finger contact holding member 21 made of metal (conductive) is fixed to the finger contact holding member 21. A metal (conductive) finger contact 2 is provided on the outdoor surface of the finger contact holding member 21.
2 are provided. The finger contact 22 surrounds the entire inner periphery of the rectangular door frame 20, and a pair of arc-shaped metal leaf spring members 22 urged in a direction in which they contact each other.
A, 22B. As shown in FIG. 4, tapered locking holes 23 for fixing a door 30 to be described later are formed on both inner side surfaces of the holding member 21. In order to prevent leakage and intrusion of radio waves, the metal shield plate 4, the door frame 20, and the finger contact holding member 21 on the inner surface of the side wall 3 are shield-connected to each other without any gap. Note that the door frame 20 and the holding member 21 may be entirely made of metal (conductive), but it is only necessary that at least the indoor side connected to the metal shield plate 4 and the part connected to the finger contact 22 be conductive. .

The door 30 for opening and closing the opening 2 of the anechoic chamber 1 is a door body 31 having a shield plate adhered to at least the indoor side or made entirely of metal (conductive).
And a radio wave absorber 32 for the door fixed (adhered) to the indoor side surface of the door main body 31 and a finger contact 2 on the door frame side provided on the entire periphery of the door main body 31 as shown in FIG.
2 and a knife-shaped connecting portion 33 made of metal (conductive) that can be fitted to the connecting portion. The door radio wave absorber 32 is a dielectric radio wave absorber having the same material and the same shape as the wall radio wave absorber 5, and when the opening 30 is closed with the door 30, the wall radio wave absorber 5 and the door radio wave absorber 32 are formed. The indoor surface of the radio wave absorber 32 is aligned (so that no step is generated). FIG.
In the state where the knife-edge-shaped connecting portion 33 of the door 30 is inserted and connected between the arc-shaped metal leaf spring members 22A and 22B of the finger contact 22 of the door frame 20 as shown in FIG. 20, a finger contact holding member 21, a finger contact 22, an arcuate metal leaf spring member 22A of the finger contact 22,
Knife-edge-shaped connecting portion 33 pressed against 22B, door body 3
1 has been completed to prevent leakage and intrusion of radio waves.

As shown in FIG. 3, a moving handle 34 is fixed to the outer surface of the door main body 31, and a shield joint opening / closing handle 35 is attached. As shown in FIG. 4, engaging rods 36 are provided on both side surfaces of the door main body 31 so as to be able to protrude and retract in conjunction with the opening / closing operation (rotating operation) of the shield joint opening / closing handle 35. An engagement roller 37 is pivotally mounted (rotatably mounted) at the tip. When the handle 36 is rotated in the closing direction, the rod 36 projects from both sides of the door body 31, and the roller 37 at the tip thereof is provided with a tapered locking hole on the finger contact holding member 21 side. 23. When the handle 35 is rotated in the opening direction, the rod 36 and the engagement roller 3
7 is drawn into the door main body 31.

On the other hand, as shown in FIG. 3, a fixed rail 40 constituting a main part of the moving means and a movable rail 43 substantially perpendicular thereto are provided to slide the door 30 out of the anechoic chamber to open and close. ing. A pair of fixed rails 40 are fixed outside the upper side wall 3 of the opening 2 in the anechoic chamber 1 so as to be perpendicular and parallel to the side wall. These fixed rails 40 have a C-shaped or U-shaped cross section, and wheels (rollers) 41 fixed to both ends of a connection shaft 42 can run freely.

A bearing member 44 rotatably fitted to the connecting shaft 42 is integrally formed on the movable rail 43, and the movable rail 43 extends along the fixed rail 40 in a state substantially parallel to the side wall 3. (Perpendicular to the side wall 3). At the upper part of the door main body 31, hanging metal fittings 45 as fixing tools are fixed, and wheels (rollers) 46 pivotally attached to these hanging metal fittings 45 move inside the movable rail 43 having a C-shaped or U-shaped cross section. To run.

On the outer surface of the side wall 3, a pair of side slide guides 50 are arranged and fixed in the horizontal direction. A rotating shaft 53 is rotatably supported on one side surface of the door main body 31 by a rotating shaft support bracket 51, and a tip of a guide arm 52 fixed to the rotating shaft 53 can be fitted and slid on the side slide guide 50. (Although not shown, the roller pivotally attached to the tip of the guide arm 52 travels in the slide guide 50,
The guide arm 52 is slidable and undulating with respect to the side slide guide 50. ).

A rail-side hook (hook) 47 is integrated with the end of the movable rail 43, and a door-side hook (hook) 48 is integrated with one of the hanging brackets 45. The door-side hook 48 is engaged (locked) with the rail-side hook 47 at a position directly opposite the opening 2.

The length of the fixed rail 40 is such that the movable rail 43 can move more than the thickness of the radio wave absorber 32 for the door, and the radio wave absorber 32 for the door is located at the most protruding portion on the opening 2 side. The dimensions are set such that the movable rail 43 can be moved to a position where it does not touch. Further, the length of the movable rail 43 is set to a size that allows the hanging bracket 45 to move with respect to the movable rail 43 by the width of the door main body 31 or more. Although not shown, stopper means are provided for regulating the movement amount of the movable rail 43 with respect to the fixed rail 40 and the movement amount of the hanging bracket 45 with respect to the movable rail 43 within an appropriate range.

In the configuration of the first embodiment, as shown in FIG. 1, when the door 30 closes the opening 2 of the anechoic chamber 1, as shown in FIG.
Is in a state of being inserted and pressed between the arc-shaped metal leaf spring members 22A and 22B of the finger contact 22 on the door frame 20 side. The door 30 functions as an electromagnetic wave shielding door, and the door 30 is covered by a door radio wave absorber 32 on the indoor side. Radio wave absorption characteristics equivalent to those of the partial radio wave absorber 5 can be realized.

The door 30 with the opening 2 of the anechoic chamber 1 closed
When opening the handle, first open and close the shield
5, the engaging rod 36 shown in FIG. 4 is pulled toward the door main body 31 and the engaging roller 37 is pulled out along the tapered locking hole 23. As a result, the roller 3
7 moves along the inclined surface of the locking hole 23,
The movement of the door body 31 in the direction of the arrow Y1 perpendicular to the wall surface occurs, the knife-edge-shaped connection portion 33 on the door side is removed from the finger contact 22, and the door body 31 is free from the door frame side. As described above, when the engagement roller 37 goes up the taper of the tapered locking hole 23, the arrow Y1
Direction mechanical force to generate an arc-shaped metal leaf spring member 2
The knife-edge-shaped connecting portion 33 can be removed from the finger contact 22 against the spring pressure and frictional resistance of 2A and 22B. The engagement (lock) state of the door-side hook 48 and the rail-side hook 47 in FIG.
0 is locked to the movable rail 43 side so as not to shift in the lateral direction.

Next, the free door 30 is moved to the moving handle 3.
4 and the movable rail 43 are further pulled out in the outdoor direction (Y1 direction) along the fixed rail 40, and as shown by the phantom line in FIG. (Here, an end portion of the finger contact holding member 21) is provided so as not to come into contact therewith.

Next, the door 30 is released from the movable rail 43 by disengaging (or automatically disengaging) the door-side hook 48 and the rail-side hook 47 shown in FIG. Then, the door 30 is moved along the movable rail 43 supported substantially in parallel with the side wall 3 by the fixed rail 40 in a direction parallel to the side wall as shown by an arrow X1 or more, and as shown by a solid line in FIG. The door 30 is completely retracted from the front of the opening 2 so that an effective opening can be obtained. Then, the test object, the measuring device, and the like are carried into or out of the anechoic chamber 1 using the opened opening 2.

Conversely, in order to close the opening 2 with the door 30 from the state where the door 30 in FIG. 2 is open, the door 30 is moved in the reverse direction along the movable rail 43 in the direction of the arrow X2, , The door 30 is set so that the door 30 faces the front of the opening 2, and then the door 30 and the movable rail 43 are advanced in the direction of arrow Y2 along the fixed rail 40, and The knife-edge-shaped connecting portion 33 is inserted into the finger contact 22. At this time, since a considerable force is required, the shield joint opening / closing handle 35 is rotated in the closing direction to project the rod 36 to both sides of the door main body 31, and the engaging roller 37 is engaged with the tapered locking hole 23. Go. As a result, a driving force for inserting the knife-edge-shaped connecting portion 33 on the door body 31 side in the arrow Y2 direction into the finger contact 22 is generated, and the arc-shaped metal leaf spring member 22 is formed.
A knife-edge-shaped connection portion 33 is inserted between A and 22B to perform shield connection between the wall surface side and the door 30 side, and the door main body 31 is securely locked to the door frame 20 side. Note that the structure of the guide arm 52, which is fixed to the rotating shaft 53, is slidable by fitting the tip of the guide arm 52 to the side slide guide 50. When the door 30 is slid in the lateral direction, the door 30 is inclined. , And a smooth sliding operation of the door 30 is enabled.

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

(1) The notch of the radio wave absorber for the door, which is necessary for the swing type door in the conventional structure shown in FIG. 7, is eliminated, and the characteristic of the anechoic chamber is not reduced. The need for complicated notch processing for installation at 30 is eliminated, and construction costs can be reduced.

(2) When the opening 2 is closed by the door 30, the positions of the surfaces of the door radio wave absorber 32 and the wall radio wave absorber 5 can be made to coincide with each other, which has occurred in the conventional structure of FIG. The step of the radio wave absorber at the door portion can be eliminated, and the characteristics of the radio wave anechoic chamber do not deteriorate due to reflection caused by impedance mismatch.

(3) As described in the above (1) and (2), the problem with the conventional structure shown in FIG. 7 can be solved. In the conventional structure, the door is located away from the vicinity of the center of the side wall of the anechoic chamber. The door 30 can be installed at any position,
The degree of freedom in design can be improved.

(4) The door 30 with the radio wave absorber is quickly and smoothly moved between the closed position and the open position by using the fixed rail 40 and the movable rail 43 when a test object or equipment is carried in / out. Since the door 30 which can move and is located directly in front of the opening 2 is accurately guided to the opening 2 by the fixed rail 40 while being locked to the movable rail 43, the door radio wave absorber 32 of the door 30 and the vicinity of the opening are provided. The wall radio wave absorber 5 does not break.

(5) Since there is no need to install a partition or the like, there is no need to carry out operations such as loading and unloading test specimens, measuring instruments, etc., and moving a partition when entering and exiting personnel. It is possible to reduce the manufacturing cost of the screen and the like, and it is not necessary to consider the space in the anechoic chamber, and it can be effectively applied even when the anechoic chamber is small.

(6) The fixed rail 40 and the movable rail 43 of the moving means for making the door 30 movable are located above the door 30, and the floor side of the door 30 can be reduced in size (for movement). The dead space outside the room can be reduced.

Although not mentioned in the first embodiment,
In the case where the door 30 is large and its weight is increased due to the attachment of the radio wave absorber, a large number of personnel may be required to open and close the door 30, and in such a case, the door 30 may be used.
It is preferable to add a drive source using an electric motor, hydraulic pressure or pneumatic pressure to the moving means. For example, as shown by an imaginary line in FIG. 3, the movable rail 43 and the door 30 are moved to the side wall 3 by moving the connecting shaft 42 by a hydraulic or pneumatic cylinder 90 disposed between the fixed rail 40 and the connecting shaft 42. The hydraulic or pneumatic cylinder 9 is driven between the movable rail 43 and the door body 31 in the Y1 or Y2 direction perpendicular to
1, the door 30 can be driven in the X1 or X2 direction parallel to the side wall 3. A mechanism using an electric motor instead of the hydraulic or pneumatic cylinder may be used.

Although the first embodiment exemplifies the case where a dielectric type radio wave absorber is used as the wall radio wave absorber 5 and the door radio wave absorber 32, a composite type radio wave absorber composed of a dielectric and ferrite is used. A body may be used. This case is shown in FIG. 5 as a second embodiment.

In the second embodiment according to the present invention shown in FIG.
A ferrite tile 60 is provided behind the wall radio wave absorber 5 provided on the four side walls and the ceiling surface of the anechoic chamber 1,
A ferrite tile 61 is also provided behind the door radio wave absorber 32 mounted on the door 30. That is, the metal shield plate 4 is attached to the entire inner surface (the floor 6, the ceiling, and the inner surface of the side wall 3) of the outer shell structure for constituting the anechoic chamber 1 in order to prevent the leakage and penetration of the radio wave. Further, ferrite tiles 60 are attached (adhered) to the inner four side wall surfaces and the ceiling surface, and the inner surface of the ferrite tiles 60 is covered with a foamed dielectric wall containing graphite as an ohmic loss body. The radio wave absorber 5 is attached (adhered). At least the indoor side of the door 30 is made of metal or conductive, and the ferrite tiles 61 are attached (adhered) to the entire surface of the door main body 31 on the indoor side. An electromagnetic wave absorber 32 for a door made of a foamed dielectric containing graphite as a body is attached (adhered). The other configuration is the same as that of the first embodiment.

According to the second embodiment shown in FIG. 5, in addition to the effects of the first embodiment, the ferrite tiles 60 and 61 are used in combination with the dielectric wave absorbers 5 and 32 to improve the wave absorption effect. Further improvement can be achieved.

FIG. 6 shows a third embodiment of the present invention. In this case, the moving means for moving the door 30 in the outdoor direction of the anechoic chamber 1 is different. In FIG. 6, a rail 101 for vertical movement and a rail 102 for parallel movement that define the movement path of the door 30 from the opening 2 of the anechoic chamber 1 to the outside floor 100 are laid respectively. The vertical movement rail 101 is laid (or buried) vertically (at a right angle) on the side wall 3 from the opening 2 of the side wall 3 to the outside, and the parallel movement rail 102 is
Laying (or burying) outside the anechoic chamber 1 parallel to the side wall 3
And is connected to the vertical movement rail 101 at a right angle.

A rectangular parallelepiped hollow metal pedestal 103 is fixed to the bottom of the door body 31 of the door 30. The pedestal 103 has two pairs of wheels running on the rails 101 and 102. 104 are provided. Wheel 104
Is similar to a wheel of a railway vehicle, and has a rail portion 10
Along the inner edge of 1,102, it has a support structure that can be turned 90 ° so that it can run and move. The rest of the configuration is the same as that of the above-described first embodiment, and the same or corresponding portions are denoted by the same reference characters and description thereof will be omitted.

In the case of the third embodiment, when the door 2 closes the opening 2 of the radio wave anechoic chamber 1, the door 30 functions as an electromagnetic wave shielding door as in the first embodiment. The radio wave absorber 32 for the door can realize radio wave absorption characteristics equivalent to those of the wall radio wave absorber 5.

The door 30 with the opening 2 of the anechoic chamber 1 closed
When the door is opened, the shield joint between the door 30 side and the door frame 20 side is removed in the same manner as in the first embodiment, and then the free door 30 is moved along the vertical movement rail 101 to the outside of the room. The door is further pulled out in the direction (Y1 direction), and a gap is provided such that the door radio wave absorber 32 does not come into contact with the most protruding portion on the opening side of the radio wave anechoic chamber 1 (here, the end of the finger contact holding member). At the turning point P, 90
And then turn the rail 10 for parallel movement.
6, the door 30 is moved in the direction parallel to the side wall 3 as shown by the arrow X1 by the width of the door or more, as shown by the imaginary line in FIG.
The door 30 is completely retracted from the front of the opening 2 so that an effective opening can be obtained. Then, the test object, the measuring device, and the like are carried into or out of the anechoic chamber 1 using the opened opening 2. In order to close the opening 2 from the state where the imaginary line is open, the door 30 is moved in the reverse order by the parallel moving rail 1.
02 (X2 direction), rail 101 for vertical movement (Y2
The door 30 may be moved along the (direction).

The wheels 104 may be driven by a drive source such as an electric motor.

In the first embodiment, the upper side of the door 30 is movably supported. Wheels and means for guiding the wheels are also provided on the floor side of the door 30 so as to be movably supported. Is also good.

Further, a composite electromagnetic wave absorber using a ferrite tile in combination with the third embodiment shown in FIG. 6 may be used.

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.

[0057]

As described above, according to the door structure for an anechoic chamber of the present invention, the door is provided on the side wall of an anechoic chamber using a dielectric type electromagnetic wave absorber or a composite type electromagnetic wave absorber of dielectric and ferrite. When opening and closing the opening, the door is configured by providing a dielectric type radio wave absorber or a composite type radio wave absorber of dielectric and ferrite on the indoor side surface of the door body capable of closing the opening,
The door is flat against the side wall outside the anechoic chamber.
A radio wave absorber for a door, which is necessary for a swing type door in a conventional structure, by providing a moving means that is movable in a vertical direction while maintaining a row state and movable in a direction parallel to the side wall. Notch is not required, and it is possible to prevent the deterioration of the anechoic chamber characteristics caused by the notch, and to close the position of the door radio wave absorber and the wall radio wave absorber when closing the opening with the door. Thus, the step of the radio wave absorber at the door portion, which has occurred in the conventional structure, can be eliminated, and the deterioration of the radio wave anechoic chamber characteristics due to the reflection caused by the impedance mismatch can be prevented. In the conventional structure, the door was installed at a position distant from the vicinity of the center of the side wall of the anechoic chamber in order to reduce the deterioration of characteristics.However, the door can be installed at an arbitrary position, and the degree of freedom of design is improved. It is possible.

[Brief description of the drawings]

FIG. 1 is a plan sectional view showing a first embodiment of an anechoic chamber door structure according to the present invention, showing a door closed state.

FIG. 2 is a plan sectional view showing a door opened state in the same manner.

FIG. 3 is a perspective view of the first embodiment.

FIG. 4 is a cross-sectional view of a shield joining structure portion of the first embodiment.

FIG. 5 is a plan sectional view showing a second embodiment of the present invention.

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

FIG. 7 is a plan sectional view showing a conventional door structure for an anechoic chamber.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Anechoic chamber 2 Opening 3 Side wall 4 Metal shield plate 5 Wall electromagnetic wave absorber 6,100 Floor surface 14A, 14B, 30 Door 20 Rectangular door frame 21 Finger contact holding member 22 Finger contact 31 Door main body 33 Knife edge-like connecting part 40 Fixed rail 41, 46 Wheel 43 Movable rail 45 Suspension bracket 60, 61 Ferrite tile

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Toshiaki Kobayashi TDC Corporation, 1-13-1 Nihonbashi, Chuo-ku, Tokyo (56) References JP-A-3-87094 (JP, A) JP-A-6 -21680 (JP, A) JP-A-4-203078 (JP, A) JP-A-5-18097 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H05K 9/00

Claims (5)

(57) [Claims] 1. A door structure for an anechoic chamber that opens and closes an opening provided on a side wall of an anechoic chamber using a dielectric-type electromagnetic wave absorber or a composite electromagnetic wave absorber of a dielectric and a ferrite, wherein the opening can be closed. A door provided with a dielectric type radio wave absorber or a composite type radio wave absorber of a dielectric and a ferrite on a surface on the indoor side of the main body; and making the door movable vertically in relation to the side wall outside the anechoic chamber. Bei example and moving means for movable in a direction parallel to said side walls together, securing the moving means, which is vertically secured to the side wall outer
The rail and the radio wave absorber on the door side are the most protruding on the opening side
To the fixed rail until it no longer touches the
A movable rail that is movable and is substantially parallel to the side wall,
It is movable with respect to the movable rail and fixed to the door body.
A door structure for an anechoic chamber , comprising a fixture . Wherein said wheel traveling on the stationary rail is provided on the side the movable rail, anechoic chamber door structure according to claim 1, wherein the wheel traveling on the movable rail is provided on said fixture. Wherein the movable rail or anechoic chamber door structure according to claim 1 or 2, wherein includes a drive source for moving the door. 4. A dielectric type radio wave absorber or a dielectric and a ferroelectric material.
Installed on the side wall of an anechoic chamber using a composite electromagnetic wave absorber
In a door structure for an anechoic chamber that opens and closes a girder opening, a dielectric-type electric
Wave absorber or composite electromagnetic wave absorber of dielectric and ferrite
And a door provided outside the anechoic chamber.
It is movable vertically with respect to the side wall and
Moving means for moving freely in a direction parallel to the wall, wherein the moving means is provided vertically outward to the side wall.
Vertical moving rail, and outside the anechoic chamber
It is provided parallel to the side wall and faces the vertical movement rail.
Rails for parallel movement connected at right angles to each other
Traveling on the vertical and parallel moving rails
Wherein comprising the wheels of a door body side, the so
When the radio wave absorber on the door side is
The door can be moved without touching the most protruding part on the mouth side.
A door structure for an anechoic chamber. 5. The door body, wherein a conductive finger contact is arranged around the opening, and a conductive knife-edge-shaped connecting portion for connecting to the finger contact is provided on the door body which is conductive at least on the indoor side . Two or three
Is a door structure for an anechoic chamber described in 4 .