JP4176919B2 - Anechoic chamber floor equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an anechoic chamber floor device installed on the floor of an anechoic chamber used for, for example, measurement of radiated EMI (electromagnetic noise interference), immunity test, and antenna radiation pattern measurement.
[0002]
[Prior art]
Generally, as a facility for measuring radiated EMI generated from an electronic device, an EMI anechoic chamber in which a side wall portion and a ceiling portion are covered with a radio wave absorber and a floor portion is a reflecting surface such as a metal is used. On the other hand, as an immunity test for irradiating electronic devices with jamming radio waves to test the malfunction status of electronic devices and for measuring the radiation pattern of antennas, there are six sides of the side wall, ceiling and floor. A six-sided anechoic chamber that is entirely covered with a radio wave absorber is used.
[0003]
However, since the anechoic chambers as described above are large and expensive, it is uneconomical to have both an EMI chamber and a six-sided anechoic chamber, and it may be difficult to secure the installation location. . Thus, for example, Japanese Patent Laid-Open No. 4-49698 discloses an anechoic chamber that switches only the floor structure according to the measurement purpose.
[0004]
[Problems to be solved by the invention]
However, in a conventional anechoic chamber that switches the floor structure as described above, it is necessary to lay an electromagnetic wave absorber on the floor surface or remove it from the anechoic chamber according to the purpose of measurement. Since it has been done manually one by one, it takes labor and time. In addition, it is necessary to secure a large space outside the anechoic chamber for storing the electromagnetic wave absorber removed from the anechoic chamber.
[0005]
The present invention has been made to solve the above-described problems, and can easily switch the floor structure in a short time and requires a storage space for the radio wave absorber outside. for its object to obtain a floor apparatus does not anechoic chamber with.
[0006]
[Means for Solving the Problems]
The floor apparatus of the anechoic chamber according to the invention of claim 1 is installed on the floor part of the anechoic chamber in which the side wall electromagnetic wave absorber is provided on the side wall part and the ceiling electromagnetic wave absorber is provided on the ceiling part. The metal plate and a floor wave absorber provided on the back surface through a support provided covering the entire surface of the metal plate or covering the entire surface of the metal plate. And a plurality of floor surface structures arranged side by side on the floor, each floor surface structure being independent so that either one of the metal plate and the floor wave absorber is selectively opposed to the ceiling and it has enabled inverted, and in which the end face mutual metal plates of adjacent floor structure is made in an electrically connectable contact.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a configuration diagram showing a state of an anechoic chamber according to Embodiment 1 of the present invention in a six-sided anechoic chamber specification, and FIG. 2 is a configuration diagram showing a state of the anechoic chamber in FIG. 3 is a perspective view showing the floor structure shown in FIG. 1, and FIG. 4 is a perspective view showing a state where the floor structure shown in FIG. 3 is inverted.
[0013]
In the figure, 1 is a side wall part, 2 is a side wall wave absorber provided on the side wall part 1, 3 is a ceiling part, 4 is a ceiling wave absorber provided on the ceiling part 3, and 5 is a floor part. A plurality of floor surface structures arranged side by side, and the floor device 10 is constituted by the plurality of floor surface structures 5. Each floor surface structure 5 is fixed to a support 6 serving as a strength member, a metal plate 7 such as a steel plate fixed to one surface of the support 6, and the other surface of the support 6. The floor electromagnetic wave absorber 8 is provided.
[0014]
Further, the floor wave absorber 8 has a ferrite flat plate portion 8a and a plurality of quadrangular pyramid-shaped protrusions 8b fixed to the surface of the flat plate portion 8a. The protrusion 8b is made of foamed polystyrene or foamed urethane. Furthermore, each floor surface structure 5 can be reversed so that either the surface of the metal plate 7 or the radio wave absorber 8 for floor is selectively opposed to the ceiling portion 3. Moreover, the metal plates 7 of the adjacent floor structure 5 can be electrically connected to each other.
[0015]
In such an anechoic chamber, the floor structure 5 is inverted according to the measurement purpose. For example, when performing an immunity test or antenna radiation pattern measurement, as shown in FIG. 1, the floor wave absorber 8 side is directed upward, and when measuring radiated EMI, as shown in FIG. The 7 side is facing upward. In either case, adjacent metal plates 7 are electrically connected to each other.
[0016]
As described above, in the floor apparatus 10 according to the first embodiment, the floor structure can be easily switched in a short time by simply reversing the direction of the floor structure 5 in the dark room, and can be provided outside the dark room. There is no need to provide a storage space for the floor wave absorber 8.
[0017]
In addition, when performing an immunity test or antenna radiation pattern measurement, the floor wave absorber 8 having the protrusions 8b faces upward, which hinders work before and after measurement such as loading and unloading of measurement equipment. However, since the orientation of the floor structure 5 can be individually reversed, the metal plate 7 side of some of the floor structures 5 can be directed upward during work before and after the measurement. Workability can be improved.
[0018]
The adjacent metal plates 7 can be connected to each other by bringing the end surfaces of the metal plates 7 into close contact with each other, but a leaf spring-like contact that is pressed against the metal plate 7 adjacent to the end of the metal plate 7. A sufficient contact pressure can be ensured.
[0019]
In the first embodiment, the metal plate 7 and the floor wave absorber 8 are fixed to both surfaces of the support 6, but sufficient strength is provided by at least one of the metal plate 7 and the floor wave absorber 8. If it can be secured, the floor wave absorber 8 may be directly fixed to the back surface of the metal plate 7.
[0020]
Furthermore, in Embodiment 1, the floor wave absorber 8 having the flat plate portion 8a and the protruding portion 8b is shown. However, the flat plate portion 8a is omitted and the protruding portion 8b is fixed to the support 6 or the metal plate 7. May be.
[0021]
Embodiment 2. FIG.
Next, FIG. 5 is a block diagram showing the state of the anechoic chamber according to Embodiment 2 of the present invention when the six-sided anechoic chamber is specified, and FIG. 6 is a configuration showing the state of the anechoic chamber of FIG. 7 and 7 are side views showing the floor structure of FIG. The second embodiment is not a specific description of the invention described in claim 1.
[0022]
In this example, each floor surface structure 11 is rotatable about a rotating shaft 12 extending along the horizontal direction. That is, each floor surface structure 11 can be reversed by rotating around the rotation shaft 12. The rotating shaft 12 extends along the center of the support 6 in the width direction, and the installation position of the floor structure 11 is the same regardless of the orientation. That is, the installation position of the floor structure 11 is the same in both the six-surface anechoic chamber specification and the EMI anechoic chamber specification. The rotation radius R of the floor surface structure 11 is larger than half the width L (L / 2) and smaller than the width L. Other configurations are the same as those in the first embodiment.
[0023]
FIG. 8 is an explanatory view showing a state in which one floor surface structure 11 of FIG. 7 is inverted. Each floor surface structure 11 is reversed in the order of (a) to (e) in FIG. 8 or in the order of (e) to (a), and the state is changed to a six-sided anechoic chamber specification and an EMI anechoic chamber specification. Be switched between. Further, the floor structure 11 is inverted mainly by the driving force of a motor (not shown), but can be manually inverted.
[0024]
According to such a floor apparatus 10, since the floor surface structure 11 can be reversed by rotating around the rotating shaft 12, the floor surface structure can be switched more smoothly and easily. Further, since the turning radius R of the floor structure 11 is larger than half of the width L (L / 2) and smaller than the width L, the floor surface absorber 11 is sufficiently secured while the floor surface structure 11 is sufficiently high. It can prevent that the structure 11 interferes with the adjacent floor structure 11 at the time of inversion.
[0025]
Embodiment 3 FIG.
Next, FIG. 9 is a configuration diagram showing the state of the anechoic chamber according to Embodiment 3 of the present invention when the six-side anechoic chamber is specified, and FIG. 10 is a configuration showing the state of the anechoic chamber of FIG. 11 and 11 are side views showing the floor structure of FIG. The third embodiment is not a specific description of the invention described in claim 1.
[0026]
In this example, each floor surface structure 13 is rotatable about a rotating shaft 14 extending in the horizontal direction. That is, each floor surface structure 13 can be reversed by rotating around the rotation shaft 14. The rotating shaft 14 extends along one end portion in the width direction of the support 6, and the floor structure 13 is rotated and reversed between the installation areas of the adjacent floor structures 13 ( Single-open type). That is, the installation position of the floor structure 13 is moved between the six-surface anechoic chamber specification and the EMI anechoic chamber specification. The rotation radius R of the floor structure 13 is larger than the width L and smaller than twice the width L (2L). Other configurations are the same as those in the first embodiment.
[0027]
FIG. 12 is an explanatory view showing a state in which one floor structure 13 in FIG. 11 is inverted. Each floor structure 13 is inverted in the order of (a) to (e) in FIG. 12 or in the order of (e) to (a), and the state is changed to the six-sided anechoic chamber specification and the EMI anechoic chamber specification. Be switched between. Inversion of the floor structure 13 is mainly performed by a driving force of a motor (not shown), but can also be reversed manually.
[0028]
According to such a floor apparatus 10, since the floor surface structure 13 can be reversed by rotating around the rotating shaft 14, the floor surface structure can be switched more smoothly and easily. Further, since the turning radius R of the floor surface structure 13 is larger than the width L and smaller than twice the width L, the floor surface structure 13 can be secured while sufficiently securing the height of the floor wave absorber 8. Interference with the adjacent floor structure 13 at the time of inversion can be prevented.
[0029]
The floor structures 11 and 13 of the second and third embodiments are inverted simultaneously with the adjacent floor structures 11 and 13, but for each row parallel to the short side direction or the long side direction of the anechoic chamber, Alternatively, the control circuit may be divided for each block having an arbitrary area, and inversion control may be performed for each column or each block.
[0030]
Embodiment 4 FIG.
FIG. 13 is a block diagram showing the state of the anechoic chamber according to Embodiment 4 of the present invention when the six-side anechoic chamber is specified, and FIG. 14 is a block diagram showing the state of the anechoic chamber of FIG. It is. In this example, the floor apparatus 10 is configured by combining the floor structure 11 illustrated in FIG. 7 and the floor structure 13 illustrated in FIG. 11. The fourth embodiment is not a specific description of the invention described in claim 1.
[0031]
In this way, floor surface structures 11 and 13 having different inversion methods are used in appropriate combination depending on the size of the structural space such as near the turntable, near the receiving antenna, near the wall surface, near the carry-in entrance, and near the antenna elevator. It is also possible to efficiently use the space in the anechoic chamber. Moreover, you may combine the floor surface structure 5 shown in FIG.
[0032]
【The invention's effect】
As described above, the floor apparatus of the anechoic chamber according to the first aspect of the present invention has a plurality of floor surfaces that can be reversed so that either one of the metal plate and the floor wave absorber is selectively opposed to the ceiling portion. Since the structures are arranged side by side on the floor and the metal plates of the adjacent floor structures can be electrically connected to each other, the floor structure can be easily switched in a short time, and the radio wave absorber Storage space can be eliminated.
[0033]
The bed apparatus of the anechoic chamber of the invention of claim 1, between the metal plate and the floor wave absorber, when is interposed a support comprising a strength member is sufficiently secure the strength of the floor structure can do.
[0037]
In the anechoic chamber according to the first aspect of the present invention, a plurality of floor surface structures that can be reversed are arranged on the floor so that either the surface of the metal plate or the electromagnetic wave absorber for floor is selectively opposed to the ceiling. Since the metal plates of the adjacent floor structure can be electrically connected to each other, the floor structure can be easily switched in a short time, and the storage space for the radio wave absorber is not required. be able to.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a state of an anechoic chamber according to Embodiment 1 of the present invention when a six-sided anechoic chamber is used.
2 is a configuration diagram showing a state of the anechoic chamber of FIG. 1 when an EMI anechoic chamber is used.
3 is a perspective view showing the floor structure of FIG. 1. FIG.
4 is a perspective view showing a state in which the floor structure in FIG. 3 is inverted. FIG.
FIG. 5 is a configuration diagram showing a state of an anechoic chamber according to Embodiment 2 of the present invention when a six-sided anechoic chamber is used.
6 is a configuration diagram showing a state of the anechoic chamber of FIG. 5 when the EMI anechoic chamber is used.
7 is a side view showing the floor structure of FIG. 5. FIG.
FIG. 8 is an explanatory diagram showing a state in which one floor structure in FIG. 7 is reversed.
FIG. 9 is a configuration diagram showing a state of an anechoic chamber according to Embodiment 3 of the present invention when a six-sided anechoic chamber is used.
10 is a configuration diagram showing a state of the anechoic chamber of FIG. 9 when an EMI anechoic chamber is used.
11 is a side view showing the floor structure of FIG. 9. FIG.
12 is an explanatory diagram showing a state in which one floor structure in FIG. 11 is reversed. FIG.
FIG. 13 is a configuration diagram showing a state of an anechoic chamber according to Embodiment 4 of the present invention when a six-sided anechoic chamber is used.
14 is a configuration diagram showing a state of the anechoic chamber of FIG. 13 when an EMI anechoic chamber is used.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Side wall part, 2 Wave absorber for side walls, 3 Ceiling part, 4 Wave absorber for ceilings, 5, 11, 13 Floor structure, 6 Support body, 7 Metal plate, 8 Wave absorber for floors, 10 Floor apparatus , 12, 14 Axis of rotation.

Claims (1)

In an anechoic chamber floor device installed on a floor of an anechoic chamber in which a side wall electromagnetic wave absorber is provided on a side wall and a ceiling electromagnetic wave absorber is provided on a ceiling, a metal plate, and Covering the entire surface of the back surface side or having a floor wave absorber provided on the back surface through a support provided so as to cover the entire surface, and arranged side by side on the floor portion Provided with a plurality of floor surface structures, each of the floor surface structures can be independently inverted so that either the metal plate or the floor wave absorber is selectively opposed to the ceiling portion. A floor apparatus for an anechoic chamber, characterized in that the end surfaces of the metal plates of the floor structure adjacent to each other are in close contact and can be electrically connected.

Images