JPH0345972B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electromagnetic shielding ceiling system for an electromagnetically shielded intelligent building suitable for employing a network system using radio waves inside the building.

[Conventional technology]

Generally, in intelligent buildings, information communication equipment such as multi-purpose electronic exchanges and computers is shared to communicate information within the building and with the outside world. The amount of information is increasing. Under such circumstances, the challenge for buildings is how to quickly provide large amounts of information in response to requests at low cost. To address these issues in intelligent buildings, information networks based on the data highway system using optical fiber cables and coaxial cables have been studied and proposed.

[Problem that the invention seeks to solve]

However, with the data highway method that uses fiber optic cables and coaxial cables, fiber optic cables and coaxial cables must be laid out to every corner (terminal equipment) in an intelligent building, and the cables must be installed on the floor. Ducts and a double floor structure are required, and the construction cost and construction period cannot be ignored.

In addition, if radio waves are used for information communication, there will be no need to lay cables, but in this case, on the one hand, frequencies up to 50 GHz are subject to regulations under the Radio Law because they emit noise radio waves to the outside, and on the other hand, A problem arises in that the system malfunctions due to external radio waves or the like.

Therefore, the applicant has proposed various types of intelligent buildings that enable communication within the building using radio waves by creating an electromagnetic shielding structure for the entire building by using electromagnetic shielding materials in the frame and openings such as windows and doorways. We are making proposals. However, when communicating using radio waves in such an intelligent building, if n channels of frequency bands are assigned to each floor, in a building with m floors, n x
A frequency band of m channels is required. Therefore, if the frequency bandwidth of each channel is 25 kHz, the required frequency bandwidth when the entire building is treated as one electromagnetic shield space is 25 kHz x n x m. For this reason, as buildings become taller and the amount of traffic increases, the required frequency band (required number of channels) becomes wider, and as a result, communication equipment becomes larger in scale.

In addition, there are lighting fixtures and other power equipment that are noise sources in the ceiling, and malfunctions due to noise from these power equipment can also be a problem.

The present invention solves the above-mentioned problems, and aims to provide an electromagnetic shielding ceiling system that can reduce the number of wireless communication channels carried out in a building and can shield noise from power equipment, etc. It is something to do.

[Means for solving problems]

To this end, the electromagnetic shielding ceiling system of the present invention
A special T-bar that has a space for incorporating an antenna on the indoor side is used as a T-bar that supports ceiling structural members such as ceiling panels and lighting equipment, and the special T-bar and the conductive part of the ceiling structural member are electrically integrated. The antenna is connected to the ground and is insulated from the special T-bar using an insulating material.

[Effect]

In the electromagnetic shielding ceiling system of the present invention, the attic and the room are electromagnetically shielded, and the antenna is built into the ceiling, so indoor communication equipment etc. are prevented from malfunctioning due to noise generated from power equipment placed in the attic. It can be prevented. Furthermore, by electromagnetically shielding each floor, it is possible to communicate using electromagnetic waves in the same frequency band, and communication equipment with the same specifications can be used on each floor.

〔Example〕

Examples will be described below with reference to the drawings.

FIG. 1 is a diagram showing one embodiment of the electromagnetic shielding ceiling system according to the present invention, and FIG. 2 is a diagram showing the entire ceiling in which the entire ceiling has an electromagnetic shielding structure and an antenna is installed on the indoor side. In the figure, 1 is Norim, 2 is T
Bar holder, 3 is special T-bar, 4 is ceiling board, 5 is electromagnetic shielding material, 6 is lighting equipment, 7 is antenna, 8 is conductive material, 9 is insulating material, 11 is slag, 12 is hanging bolt, 13 is 14 is a reinforcing bar, 15 is a crossover connection line, 16 is an air conditioning duct, and 17 is a filter.

In Figure 1, the field edge 1 is suspended from the slab with hanging bolts, and the T-bar support 2
is fixed to this field edge 1 and supports the special T-bar 3. As shown in the figure, the special T-bar 3 supports a ceiling plate 4, a lighting fixture 6, etc., and also allows an antenna 7 for wireless communication to be installed inside the room. Antenna 7 is built into the indoor side of this special T-bar 3, and ceiling plate 4 has electromagnetic shielding performance.
By configuring the ceiling using lighting fixtures 6 and the like, wireless communication becomes possible on each floor. When the ceiling has a shielding effect, an electromagnetic shielding material 5 such as a conductive film is used for the ceiling board 4, and a conductive material 8 is used at the joint between the special T-bars 3 to electrically connect them. do. Also, antenna 7
The special T-bar 3 may be insulated from the special T-bar 3 using an insulating material 9. Note that as the antenna 7, a leaky coaxial cable, a waveguide, or the like can be used.

The second image shows the entire ceiling with an electromagnetic shielding structure and an antenna built into the room.
It is a diagram. In FIG. 2, a louver with an electromagnetic shielding effect is used for the lighting fixture 6, and a conductive mesh filter 1 is installed at the opening of the air conditioning duct 16.
7 is inserted. Then, by electrically connecting the louver and the special T-bar 3 with the connecting wire 15, it can be integrated with the ceiling board 4, or by connecting the special T-bar 3 and the filter 17 with a conductive material or direct contact. Therefore, they are electrically connected and integrated,
By dropping it to the ground through the reinforcing bar 13, the entire ceiling can have an electromagnetic shielding effect.
As a result, for example, lighting equipment ballasts and other power equipment placed in the ceiling are shielded from the room.
It is possible to prevent indoor communication equipment from malfunctioning due to these noises.

The antenna built into the ceiling as described above can be used for wireless communication between communication devices installed on each floor by connecting a coaxial cable with a branch. In addition, coaxial cables for TV viewing through EPS can be used. In this way, by providing electromagnetic shielding not only on the outer wall surface of the building frame but also on the ceiling of each floor, and by dividing the electromagnetic shielding space into each floor, it is possible to allocate a frequency band to each floor for communication. Therefore, by allocating an n-channel frequency band to each floor, wireless communication using the same n-channel frequency bandwidth of 25 kHz x n is possible for the entire building regardless of the number of floors. Furthermore, radio waves in any economically advantageous frequency band can be used regardless of regulations under the Radio Law.

Next, structural materials for ceiling panels and floor panels and lighting fixtures suitable for use in combination with the electromagnetic shielding ceiling system according to the present invention to divide an electromagnetically shielded space between floors will be illustrated.

FIG. 3 is a diagram showing an example of an assembled board of an electromagnetic shielding structure used for a ceiling board or a floor board, where 21 and 24 are finishing materials, 22 is a shielding material, and 23, 25, and 26 are conductive films.

The assembly board shown in FIG. 3 is composed of a finishing material 21 and a shielding material 22 of the same size, which are shifted in two directions and stacked one on top of the other as shown in FIG. 3a. When arranging these to create a ceiling or floor surface, finishing material 21 that does not overlap
The part is connected to the shielding material 22 of the adjacent assembly board, and
The portions of the shielding material 22 that do not overlap are arranged so as to overlap with the finishing material 21 of the adjacent assembly board. When arranging the assembly boards in this way, if a gap is created between the shielding materials of adjacent assembly boards, radio waves will leak from there. By applying the conductive film 23, electromagnetic shielding performance is ensured.

Also, instead of the shielding material 22 shown in FIG. 3b, a third
As shown in FIG. c, a finishing material 25 similar to the finishing material 21 may be used, and a conductive film 25 may be attached to the overlapping surface thereof. Furthermore, for convenience, a conductive film 2 is applied only to the portion of the finishing material 21 that does not overlap with the shielding material 22, as shown in FIG. 3d.
6 may be pasted.

FIG. 4 is a diagram showing one embodiment of an electromagnetic shielding type lighting fixture, in which 31 is a steel plate fixture body, 32 is a ceiling plate, 33 is a lighting fixture frame, 34 is a conductive material, and 35 is a V
36 is a louver, and 37 is an illumination lamp.

In FIG. 4, the louver 36 is a grid-shaped louver made of a steel plate, and is attached to the lighting fixture frame 33 and electrically connected to the lighting fixture frame 33 through a conductive material 34. Furthermore, this lighting fixture frame 33 is electrically connected to the steel plate fixture body 31 through a conductive material 34, and from the steel plate fixture body 31 to the conductive parts (electrically grounded conductive parts) of building structural materials such as the ceiling board 32. ). In this way, in the electromagnetic shielding type lighting fixture according to the present invention, the louver 36 shields electromagnetic noise emitted from the lighting lamp 37 and the fixture body to the bottom surface, and FIG. 4 shows a plan view thereof. It is b. This louver 3
In order to actually shield the electromagnetic wave noise emitted from the illumination lamp 37 to the lower surface by using the grid spacing 6, it is necessary to set the grid spacing corresponding to the frequency used. For example, if the grid spacing is 30mm, 10G
It is equal to the wavelength (λ) of a frequency of Hz, but a pitch of λ/10 is required to ensure practical electromagnetic shielding performance. Therefore, sufficient electromagnetic shielding performance can be ensured when the operating frequency is 1 GHz, which is 1/10 of 10 GHz.

Note that the present invention can be modified in various ways and is not limited to the above embodiments.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, it is possible to construct a system that divides the electromagnetic shielding space in a building by the ceiling surface, so it is possible to select the frequency band independently on each floor, and Each floor can use the same frequency band or a repeating communication device with multiple bands. Therefore, each floor can use the same specification range or multiple communication equipment with extremely limited specifications.
It is possible to standardize communication equipment and reduce equipment costs regardless of the size of the building. In addition, by shielding the living room where radio waves are used and the ceiling where there are many noise sources such as lighting lamp ballasts and power lines, a suitable wireless communication environment can be realized.

[Brief explanation of drawings]

Fig. 1 is a diagram showing one embodiment of the electromagnetic shielding ceiling system according to the present invention, Fig. 2 is a diagram showing the entire ceiling in which the entire ceiling has an electromagnetic shielding structure and an antenna is installed on the indoor side, and Fig. 3 is a diagram showing an example of the electromagnetic shielding ceiling system according to the present invention. FIG. 4 is a diagram showing an example of an assembly plate having an electromagnetic shielding structure used for a ceiling board or a floor board, and FIG. 4 is a diagram showing an example of an electromagnetic shielding type lighting fixture. 1... Noen, 2... T bar receiver, 3... Special T
Bar, 4... Ceiling board, 5... Electromagnetic shielding material, 6...
Lighting equipment, 7... Antenna, 8... Conductive material, 9...
...Insulating material, 11...Slab, 12...Hanging bolt, 13...Reinforcing bar, 14...Structure, 15...Transit connection wire, 16...Air conditioning duct, 17...Filter, 21 and 24...Finishing material , 22...shielding material,
23, 25 and 26... conductive film, 31...
Steel plate appliance body, 32... Ceiling plate, 33... Lighting equipment frame, 34... Conductive material, 35... V-shaped spring, 3
6... Louver, 37... Lighting lamp.

Claims (1)

[Scope of Claims] 1. A T-bar having an antenna built-in structure on the indoor side is used as a T-bar that supports ceiling structural members such as ceiling panels and lighting equipment, and the T-bar and the conductive part of the ceiling structural member are electrically connected. An electromagnetic shielding ceiling system characterized by incorporating an antenna that is integrally connected to the ground and insulated from the T-bar using an insulating material. 2. The electromagnetic shielding ceiling system according to claim 1, wherein the T-bar and the conductive part of the ceiling structural member are electrically integrated using a conductive material.