JPH0626132A - Magnetic-shielding floor panel - Google Patents

Abstract

PURPOSE:To shield a leakage magnetic field generated from a power cable wired in a free space positively by integrally installing a magnetic shielding material on the whole surface of a floor panel. CONSTITUTION:Support legs 2 for adjusting height are fixed at four corners of an underside, and a magnetic shielding material 3 is mounted integrally to the plane section of a floor panel 1 manufactured in a square plate shape by a material having rigidity such as a metal. The magnetic shielding material 3 is also set up integrally on the external side face of a flange 1a projected downward and fitted around the floor panel 1. A large number of the floor panels are continued crosswise and disposed on a reference floor face at regular intervals, thus forming a free access floor while shaping shielding surfaces connected under a mutually abutted state in the connecting sections of the panels by the magnetic shielding materials installed on the whole surface at every floor panel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double floor structure in which a flat floor panel is laid above a standard floor surface of a building at a predetermined distance from it, and the space between them is used as a cable wiring space. Regarding the floor panel of.

[0002]

2. Description of the Related Art With the progress of office automation, due to the need for cable wiring for office automation equipment, a large number of floor panels are spread over a standard floor surface of a building such as a concrete floor at a predetermined interval. A double floor structure in which a free space for cable wiring is secured between a floor panel and a reference floor surface, that is, a free access floor structure is known.

In the case of a free access floor structure, power cables, signal cables, etc. of various electronic devices such as terminal devices and telephones are arranged in a free space below the floor panel.

On the other hand, in a monitor or television having a cathode ray tube (CRT) such as a terminal device used on the floor surface by the floor panel, an electron beam from an electron gun hits a phosphor in an image display section to form an image. However, these monitors and televisions have recently been tending toward higher precision and larger size. An image created with such a structure is very sensitive to an external magnetic field, and the trajectory of the flying electron beam is deviated by a slight magnetic field, so that a predetermined image is not formed. That is,
In a static magnetic field, a color change phenomenon occurs, and in an AC magnetic field, an image shake phenomenon occurs.

As a cause of the static magnetic field, a railway using a direct current, a normal conductor used in a magnetic resonance apparatus (MRI), a superconducting magnet, a speaker or a magnet, or an electricity using a direct current is used. Equipment etc. In addition, as a source of an AC magnetic field that causes a problem of image shake, there are a power transmission line, a power cable, a transformer, or electronic or electric equipment using a transformer.

Since these sources are increasing and CRTs are becoming more sensitive, manufacturers of CRTs have taken magnetic shield measures. That is, an internal shield that puts a soft magnetic material in the CRT, an external shield that arranges the soft magnetic material between the housing and the CRT, etc. have been studied and implemented, but they are not sufficient, and the trouble of the image is solved. Not.

The discoloration and shake phenomenon of an image differ depending on the direction of the magnetic field, and it is necessary to study various countermeasures. In order to obtain a normal image, a double or triple shield is applied by an external shield that puts a TV and a monitor in a shield box made of a soft magnetic material. Examples of soft magnetic materials include pure iron, silicon steel, permalloy, and amorphous metal. When constructing a shield box with these materials, it is necessary to consider the structural means such as welding or using a reinforcing material, so that the weight is increased, and heat treatment such as strain removal may be necessary to improve the characteristics.
In addition, because of the appearance problem, it is difficult to use because the price is high because the interior and exterior materials are separately used.

Further, since each manufacturer of televisions and monitors adopts its own unique appearance and dimensions, even if a standard type shield box is provided, the number of televisions and monitors that can be used is limited. It will be limited. Therefore, up to now, shield boxes suitable for each television and monitor have been manufactured, but there is a drawback in that a small amount and a large variety of products are produced and the cost is high.

Therefore, the applicant of the present invention filed Japanese Utility Model Application No. 1-3139.
No. 8, Jpn. Pat. Appln. 1-313399, Jpn. Pat. Appln. 3-63008
In the article, a technique was proposed in which a shield plate and a flat plate made of a soft magnetic material bent into an L shape were combined so that the connecting portions overlap each other to form a box-shaped shield plate that fits the outer dimensions of the television and monitor. As a result, by selecting and combining flat plates and L-shaped shield plates of appropriate sizes, it is possible to make a shield box that fits televisions and monitors of various sizes, and it is possible to reduce costs. However, if a TV or monitor is covered with a shield plate in a box shape, not only is it difficult to move for adjusting the angle, but also there is a sense of discomfort, which leads to a reduction in office efficiency.

Further, when the magnetic interference is wide,
Not only is it inefficient to take measures for each device,
It creates a unique office atmosphere, which gives a sense of discomfort and reduces efficiency.

On the other hand, as a measure against magnetic interference from the lower floors, a magnetic shield material is applied to the ceiling of the lower floors, or a magnetic field is shielded from the lower side by shielding the floor surface. It is possible to

However, like the free access floor,
If the leakage magnetic field from the power cable arranged in the free space on the reference floor is a problem, applying magnetic shield material on the reference floor such as concrete floor will not be effective and will be formed by the floor panel. If a magnetic shield material is installed on the free floor, the free space on the standard floor is effectively used and the effectiveness of the free access floor, which is easy to change the wiring when changing the layout, is hindered and the free access The meaning of the floor disappears. Further, since the floor panel constituting the conventional free access floor has its main body made of metal or other material, it has a function as a structural body, but it does not have magnetic shielding property.

[0013]

SUMMARY OF THE INVENTION In view of the above-mentioned problems relating to the magnetic shield of the free access floor constituted by the conventional floor panel, the present invention has a free space formed between the reference floor surface and the floor panel. It is an object of the present invention to provide a floor panel that can form a floor surface that can reliably shield a leakage magnetic field generated from a power cable arranged in the floor panel and that can easily change wiring etc. when changing the layout. And

[0014]

In order to solve the above problems, the floor panel of the present invention is characterized in that a magnetic shield material is integrally provided on the entire surface of each floor panel.

[0015]

In the floor panel of the present invention, the magnetic shield material is integrally provided on the entire surface of each floor panel as described above. Therefore, like the conventional floor panel, a predetermined space is provided on the reference floor surface. A free access floor can be formed by arranging a large number of sheets continuously in the vertical and horizontal directions, and the magnetic shield material entirely provided for each floor panel is in a state of abutting each other at the panel connecting portion. A continuous shield surface is formed.

This allows magnetic shielding to some extent, but since the magnetic leakage cannot be completely prevented by simply abutting the joints with each other, a flange protruding downward is provided around the floor panel. If it is provided, the magnetic shield material provided on the flat plate portion is also provided with the magnetic shield material on the flange portion, and the magnetic shield materials provided on the flange portions of the adjacent panels face each other with a certain width face. The magnetic shield is completely performed by bringing them into contact with or in proximity to each other.

The magnetic shield floor panel having the above-mentioned structure is simply arranged vertically and horizontally so that the structural floor surface and the magnetic shield layer are formed by mounting them side by side at a predetermined height from the reference floor surface. It is also easy to partially remove the floor panel. Moreover, if it is made to have the same external dimensions as a normal floor panel without a magnetic shield material, the magnetic shield floor panel of the present invention is used only in a range requiring a magnetic shield, and in other areas, a normal floor is used. When the panel is used, there is no step at the boundary line, and when a surface finishing material such as a decorative tile or carpet is applied on the panel, the panel can be finished in one plane.

[0018]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a diagram showing an example of a double floor structure (free access floor) using a floor panel 1 to which the present invention is applied. As shown in FIG. 2, the floor panel 1 has support legs 2 for height adjustment fixed to the four corners of the lower surface thereof, and is made of a material having rigidity such as metal into a square flat plate shape. The floor panel 1 is arranged vertically and horizontally with the edges of the adjacent panel and the flat plate portion in contact with each other at a certain height position on the reference floor surface 7 by the support legs 2 and the upper surface thereof is a plane. None, and a surface finish material 6 such as a vinyl tile or a carpet having the same plane size is arranged thereon so that its corner portion is located at the center point of the floor panel 1 and is removably attached by an adhesive tape or the like. A power cable 4 and the like are wired in the space between the reference floor surface 7 and the lower surface of the floor panel 1. The position where the power cable, telephone line, etc. stand on the floor is the point where the vertical and horizontal contact lines of the floor panel 1 intersect, so the corners of the floor panel 1 are notched so that there are through holes through which the power cable, etc. can pass. Has been.

As shown in FIG. 3, the floor panel 1 in the area where the magnetic flux is generated in the area where the power cable 4 is routed and in the vicinity thereof (area hatched in the figure) has a magnetic shield according to the present invention as shown in FIG. The material 3 is integrally provided on the entire flat surface portion. The floor panel 5 provided outside the range where magnetic flux is generated is no different from the floor panel of the conventional free access floor.

In the embodiment shown in FIG. 4, the magnetic shield material 3
Is adhered to the entire upper surface of the flat portion of the floor panel main body 1, but may be embedded in the flat portion of the main body 1. Figure 4
3 shows a state in which a plurality of floor panels provided with the magnetic shield material 3 on the flat surface portion are arranged in contact with each other.

In this case, the magnetic shield materials 3 of the adjacent floor panels 1 are arranged on one plane with their end faces abutting each other. Therefore, magnetic leakage from the contact portion is unavoidable. To prevent this, it is known that adjacent magnetic shield materials 3 may be overlapped with a width of 10 to 30 mm or may be completely integrated by welding or the like.

When the magnetic shield materials of the adjacent floor panels are welded to each other, the removal of the floor panels becomes very troublesome when it becomes necessary to remove the floor panels due to a layout change or the like. Also, the integration work itself by welding is troublesome. Further, the magnetic leakage prevention due to the superposition is as shown by the broken line in FIG.
The magnetic shield material strips 3a may be provided so as to overlap each other with a width of mm, but this is not preferable because the installation is troublesome and a step corresponding to the thickness of the strips 3a is formed on the surface of the magnetic shield material 3.

FIG. 5 is a diagram showing a floor panel having a magnetic shield material that has improved this problem. In the example of this figure, the magnetic shield material 3 is not only on the flat surface portion of the floor panel 1, but also on the outer surface of the flange 1a provided so as to project downward around the floor panel 1 and on the flat surface portion. A magnetic seal material is provided integrally with the. Therefore, the magnetic shield materials 3 of the adjacent floor panels 1 come into surface contact with or close to each other with a certain width between the magnetic shield materials provided on the outer surface of the flange 1a, and the leakage magnetic flux is completely shielded. In addition, in FIG. 4 and FIG. 5, in order to make it easier to see the space between the adjacent floor panels, they are drawn apart, but actually they are in contact with each other.

As shown in FIGS. 4 and 5, when the magnetic shield material 3 is provided on the upper surface of the flat portion of the floor panel 1, the height of the magnetic shield material is higher than that of the floor panel without the magnetic shield material. However, since the height can be adjusted by the support legs 2, it is possible to install the floor panel with the magnetic shield material and the one without the magnetic shield material side by side, as shown in FIG. There is no inconvenience.

The usable range of the magnetic shield floor panel 1 is determined by the strength and distribution of the magnetic field to secure the required width. The strength of the magnetic field around the single wire is: B = 2I ÷ r where B: strength of magnetic field (mG) I: current (A) r: distance from cable (m), magnitude of flowing current It depends on In the case of changing the layout, it is necessary to move the magnetic shield floor panel 1 to a necessary range according to the change of the power cable, but the magnetic shield floor panel 1 and the floor panel 5 without the magnetic shield material have the same external dimensions. Therefore, it is easy to move and the necessary magnetic shield can be easily applied.

[0026]

As described above, according to the present invention, it is possible to reliably shield the leakage magnetic field generated from the power cable wired in the free space on the free access floor, and change the wiring or the like when the layout is changed. Can be done easily.

[Brief description of drawings]

FIG. 1 is a perspective view illustrating an example of a double floor structure using a floor panel to which the present invention is applied.

FIG. 2 (a) is a plan view of the floor panel,
(B) is a side view of the floor panel.

FIG. 3 is a plan view showing an installation range of a magnetic shield floor panel and an ordinary floor panel in relation to wiring of a power cable.

FIG. 4 is a sectional view showing an example of the configuration of a magnetic shield floor panel according to the present invention and a state in which a plurality of magnetic shield floor panels are arranged.

FIG. 5 is a cross-sectional view showing another example of the configuration of the magnetic shield floor panel according to the present invention and a state in which a plurality of the magnetic shield floor panels are arranged.

[Explanation of symbols]

 1 Magnetic shield floor panel body 2 Support legs 3 Magnetic shield material 4 Power cable 5 Normal floor panel 6 Surface finishing material 7 Standard floor surface

Claims (2)

[Claims] 1. A floor panel having a double floor structure, in which a flat floor panel is laid above a reference floor surface of a building at a predetermined interval from the reference floor surface, and a space between them is a space for cable wiring. A floor panel characterized in that a magnetic shield material is integrally provided on the entire surface of the panel. 2. The floor panel has a flange portion projecting downward to the periphery, and the magnetic shield material is connected to a flat plate portion of the floor panel and is also provided on the entire surface of the flange portion. The floor panel according to claim 1.