Mat and electric field suppression method using the same

Abstract

To provide a mat and an electric field suppression method using the same method that can easily suppress indoor electromagnetic wave propagation.SOLUTION: A mat 1 includes a conductive fiber layer 2 containing conductive fibers, a surface layer 3 on the top of the conductive fiber layer, and a grounding member 4 connected to the conductive fiber layer 2. The conductive fiber is formed by forming a film around a base fiber and a conductive substance containing digenite. Further, in an electric field suppression method, the mat provided with a conductive fiber layer containing conductive fibers is placed on a table, and a ground wire 41 is connected to the mat for grounding.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a mat and a method for suppressing an electric field using the same. [Background technology]

[0002] In recent years, adverse physical and mental effects (headaches, nausea, irritability, etc.) caused by extremely low frequency electromagnetic waves generated from household electrical appliances have come to be viewed as a problem. For example, it has been reported that electromagnetic waves were measured on a person wearing an electromagnetic wave protection apron and using a non-earthed computer, and that the person was exposed to an electric field of approximately 150 V / m. It has also been reported in the following Non-Patent Document 1, for example, that many of these people suffer from severe stiff shoulders, headaches, blurred vision, and allergies such as hay fever and rhinitis.

[0003] Furthermore, recently, the laboratory of Associate Professor Takuya Tsujiuchi of the Faculty of Human Sciences, Waseda University has begun a study on the effects of alternating electric fields on the body, and experimental data suggesting that the autonomic nervous system is affected by electromagnetic waves has been published in the following non-patent documents 2 and 3.

[0004] Generally, an electromagnetic wave refers to the phenomenon where an electric field and a magnetic field vibrate in mutually perpendicular directions while propagating through space or matter, or the vibrating electromagnetic field, and means a composite wave (a wave of electricity and magnetic energy) of an electric field (electric field) and a magnetic field (magnetic field). Here, in this specification, the electric field and electric field, and the magnetic field and magnetic field are used with almost the same meaning, and the electric field (electric field) refers to the range that electricity has an influence on, and the magnetic field (magnetic field) refers to the range that magnetism has an influence on.

[0005] A magnetic field is generated when an electric current flows through an electrical device. Therefore, no magnetic field is generated when the power switch of an electrical device is turned off. In contrast, an electric field is generated simply by applying a voltage. In other words, even if the power switch of an electrical device is turned off, an electric field is generated just by inserting a plug into an outlet.

[0006] Therefore, in order to suppress the generation of electric fields and avoid the adverse physical and mental effects of electromagnetic waves as described above, it is important to unplug the power plug of electrical devices from the outlet or to ground the electrical devices. Since it is not possible to unplug the power plug from the outlet while using electrical devices, the most practical and effective method of suppressing the effects of electromagnetic waves is to ground the electrical devices. By grounding the electrical devices, the electric potential of the electrical devices can be lowered. Specifically, since electric potential has the property of propagating from higher to lower, lowering the electric potential of the electrical devices makes it more difficult for the potential to propagate to people nearby.

[0007] In order to reduce the adverse physical and mental effects of extremely low frequency electromagnetic waves generated by household electrical appliances, etc., as mentioned above, various countries have established guidelines regarding electromagnetic waves and are calling for the suppression of electromagnetic waves generated by electrical appliances, etc. In particular, the guidelines established by the Swedish Trade Union Association (TCO regulations) set the strictest standards in the world, indicating Sweden's high level of interest in electromagnetic waves. Meanwhile, while the guidelines established by Japanese industry groups have the same standards regarding magnetic fields as the aforementioned Swedish guidelines, the standards regarding electric fields allow for electric fields that are five times higher at 100V and 25 times higher at 200V than the Swedish guidelines, clearly showing the delayed response and low interest.

[0008] Regarding the extremely low frequency electromagnetic waves generated by electrical equipment etc. as described above, the inventor has succeeded in putting the electrical equipment etc. into a grounded state, i.e., into the same state as being earthed, by connecting the side of the electrical equipment etc. that is connected to the earth line inside the equipment to the cold line of a single-phase two-wire power line, i.e., a grounded power line, and has applied this principle to develop a USB-compatible electric field eliminator that suppresses the generation of extremely low frequency electromagnetic waves (see Patent Document 1 below).

[0009] As a result, by installing this device in existing electrical appliances such as laptops and heated carpets, it is possible to reduce the extremely low frequency electromagnetic waves emitted by the electrical appliance to an extremely low level, and so its widespread use is anticipated from all quarters (see Patent Document 2 below).

[0010] Up until now, various theories have been said about extremely low frequency electromagnetic waves in homes, such as that they are mainly caused by electrical appliances placed in the home, or that they are mainly caused by high voltage power lines installed above the home, but no clear explanation has been given and only measures have been taken against individual sources. For example, patent documents 3 and 4 have been proposed as technologies for blocking electromagnetic waves from outside the home.

[0011] The present inventors have also obtained a patent for a construction method for suppressing the propagation of extremely low frequency electromagnetic waves within a house (see Patent Document 5 below).

[0012] The present inventors have also obtained a patent for an interior coating material capable of suppressing the propagation of electromagnetic waves from interior wiring within a house (see Patent Document 6 below). [Prior art documents] [Patent documents]

[0013] [Patent Document 1] Patent No. 4972713 [Patent Document 2] Patent No. 5037741 [Patent Document 3] Japanese Patent Application Publication No. 10-169253 [Patent Document 4] Japanese Patent Application Publication No. 11-200646 [Patent Document 5] Patent No. 5358036 [Patent Document 6] Patent No. 6121603 [Non-patent literature]

[0014] [Non-Patent Document 1] Naoki Tsuchida, "The All-Earth Era is Coming", Honokasha, October 30, 2005, p.29-30 [Non-Patent Document 2] Naoki Tsuchida, "Earth Revolution," Honokasha, August 30, 2011, p.210-213 [Non-Patent Document 3] Mikako Maeda, "Biological Effects of Electromagnetic Fields: An Attempt at Medical Anthropological Research," Waseda University, Department of Medical Anthropology, website, [Retrieved November 1, 2011], Internet<URL:http: / / www.waseda.jp / sem-tsujiuchi / Master2009-3ElectroMF.pdf> Summary of the Invention [Problem to be solved by the invention]

[0015] However, even with the above technology, it is not easy to suppress electromagnetic wave propagation indoors. For example, in recent years, furniture such as study desks and tables have come to be equipped with hardwired plug connectors, or so-called sockets, in order to make it easier to use electrical devices. More recently, hardwired plug connectors equipped with USB sockets have even appeared.

[0016] These hardwired connectors are connected to electrical wiring, which supplies power to electrical equipment. In particular, there is a problem in that even when no electrical equipment is connected to the hardwired connector, the surface of the furniture becomes charged with electricity from the electrical wiring, and a high electric field is maintained.

[0017] In view of the above problems, the present invention has an object to provide a mat and an electric field suppression method that can sufficiently suppress an electric field even in furniture with an embedded wiring plug connector. [Means for solving the problem]

[0018] A mat according to one aspect of the present invention that solves the above-mentioned problems is provided with a conductive fiber layer that contains conductive fibers.

[0019] In addition, in this respect, although not limited thereto, it is preferable to provide a surface layer on the conductive fiber layer.

[0020] In addition, in this respect, although not limited thereto, it is preferable to provide an earth terminal and an earth wire connected to the conductive fiber layer.

[0021] In addition, in this respect, although not limited thereto, it is preferable that the conductive fiber is made of a base fiber and a conductive material is formed as a coating around the base fiber.

[0022] In addition, in this respect, although not limited thereto, it is preferable that the conductive material includes digenite.

[0023] In addition, in this respect, although not limited thereto, it is preferable that the conductive fiber layer contains the conductive fibers in an average amount in the range of 1 g to 30 g per square meter.

[0024] In addition, in this respect, although not limited thereto, it is preferable that 80% or more of the conductive fibers be short fibers having a length of 2 mm or more and 4 mm or less.

[0025] In addition, in this respect, although not limited thereto, it is preferable that the surface resistance value of the conductive fiber layer is 80 Ω / □ to 300 Ω / □.

[0026] In addition, in this respect, although not limited thereto, the thickness of the conductive fiber layer is preferably in the range of 1 mm or more and 5 mm or less.

[0027] In addition, an electric field suppression method according to another aspect of the present invention includes the steps of placing a mat having a conductive fiber layer containing conductive fibers on a table, and connecting an earth wire to the mat to earth it. Effect of the Invention

[0028] As described above, the present invention can provide a mat that can easily suppress electromagnetic wave propagation indoors and an electric field suppression method using the mat. [Brief description of the drawings]

[0029] [Figure 1] FIG. 2 is a schematic diagram of a mat according to an embodiment. [Diagram 2] FIG. 2 is an enlarged cross-sectional view of a mat according to an embodiment. BEST MODE FOR CARRYING OUT THEINVENTION

[0030] Hereinafter, the embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention can be embodied in many different forms, and is not limited to the specific examples described in the following embodiments and examples.

[0031] FIG. 1 is a schematic diagram of a mat according to this embodiment (hereinafter referred to as the “present mat”) 1, and FIG.

[0032] As shown in these figures, the present mat 1 has a conductive fiber layer 2 and a surface layer 3 provided thereon. The present mat 1 can suppress the electric field on the surface of a desk or the like by providing the conductive fiber layer 2. To be more specific, in recent years, in order to make electrical appliances easier to use, it has become common to embed a wiring plug in furniture such as a study desk or table. In particular, recently, even a wiring plug with a socket for a USB has appeared. These wiring plugs are connected to an electrical wiring, and power is supplied to the electrical appliance from this electrical wiring. In particular, there is a problem that even when an electrical appliance is not connected to the wiring plug, the furniture surface is charged by the power from the electrical wiring, and a high electric field is maintained. In contrast, when the present mat 1 is used, the conductive fiber layer 2 of the present mat 1 is configured to contact the desk surface, so that this electric field can be released and the potential can be suppressed.

[0033] In addition, the size of the present mat 1 can be adjusted appropriately according to the size of the desk and is not limited, but it is preferable that it be rectangular, and if it is rectangular, it is preferable that the length of each side is, for example, 20 cm or more and 100 cm or less.

[0034] The thickness of the present mat 1 is intended for use as a normal desk mat, and in this respect, the thickness of the present mat 1 is not particularly limited, but is 2 mm to 10 mm, preferably 6 mm or less. By setting the thickness within this range, it is possible to achieve both flexibility and performance.

[0035] As shown in the above figure, the present mat 1 includes a conductive fiber layer 2 containing conductive fibers. As described above, the conductive fiber layer 2 is a layer made of conductive fibers. By using conductive fibers, as described above, the electric field on the desk surface of a desk such as a study desk or a table can be suppressed.

[0036] In addition, it is preferable that the conductive fiber layer 2 is exposed on one side of the mat 1. By exposing the conductive fiber layer 2 and bringing it into contact with the desk surface, it becomes possible to discharge (earth) the electric charge that accumulates on the desk surface to the outside.

[0037] In addition, in the present mat 1, the thickness of the conductive fiber layer 2 is preferably in the range of 1 mm to 5 mm. A thickness of 1 mm or more can ensure sufficient conductivity, while a thickness of 5 mm or less can prevent the conductivity from becoming too high.

[0038] In the present mat 1, the conductive fiber is a fiber having the property of transmitting electricity (conductivity), and a conductive material is formed as a film around the basic fiber. The "basic fiber" is a fiber that serves as a base material capable of holding the conductive material as a film, and examples of such fibers include natural fibers and chemical fibers. When chemical fibers are used, acrylic fibers and nylon fibers can be preferably used, but are not limited to these. In this case, the conductive material formed as a film around the basic fiber is preferably, but not limited to, digenite (Cu9S5). Digenite is conductive and can firmly cover the basic fiber.

[0039] In the present mat 1, the conductive fiber layer 2 preferably contains the conductive fibers in an average amount of 1 g to 30 g per square meter. By setting the amount in this range, sufficient conductivity can be ensured.

[0040] In this case, the conductive fibers are preferably 80% or more of short fibers having a length of 2 mm or more and 4 mm or less, and more preferably 3 mm or less, in the total weight of the conductive fibers. By making the length 2 mm or more, sufficient earthing performance can be achieved by the conductive fibers contacting each other in the conductive fiber layer 2, while making the length 4 mm or less prevents the entire wall from becoming conductive, and enables the coating performance as a coating material and long-term stability after coating to be maintained. The conductive fibers used here are made of nylon fibers having digenite bonds and have a surface resistance of 80Ω / □ to 300Ω / □, so they are unlikely to change over time and do not cause a fire because they do not flow a large current when a lightning strikes. Carbon and metal fibers that have been used as building materials in the past change over time in a relatively short period of time, and because they have no resistance and are conductive, they may cause a fire when a lightning strikes a large current.

[0041] In addition, although not limited thereto, the present mat 1 preferably has a surface layer 3 on the conductive fiber layer 2. The conductive fiber layer 2 is made of conductive fibers, but is generally thin. Therefore, by providing the protective surface layer 3 on top of the conductive fiber layer 2, sufficient strength can be ensured and a pleasant feel can be provided to the surface that comes into contact with the user's hands.

[0042] The surface layer 3 of the present mat 1 can be made of a material used when used as a desk mat. The material can be, but is not limited to, olefin resin, acrylic resin, vinyl chloride resin, polyurethane resin, etc., for example. The surface layer 3 of the present mat 1 can be divided into multiple layers. For example, the surface of the polyurethane resin can be appropriately adjusted by coating with vinyl chloride resin. The surface layer 3 is preferably made of an insulating material. That is, in the present mat 1, the lower surface is a conductive fiber layer 2, while an insulating surface layer is used for the surface layer 3, thereby minimizing the risk of electric leakage.

[0043] As described above, the thickness of the surface layer 3 of the present mat 1 is preferably set to a thickness obtained by subtracting the thickness of the conductive fiber layer 2 from the thickness of the present mat 1 .

[0044] Incidentally, the present mat 1 preferably includes a ground member 4 including a ground wire 41 and a ground terminal connected to the conductive fiber layer 2. The ground wire 41 is a linear member connected to the conductive fiber layer 2 and used for connecting to an external earth, and is preferably a so-called same wire. The ground wire 41 is preferably directly and inseparably connected to the conductive fiber layer 2, but if it is to be separable, it is preferable to provide a socket connected to the conductive fiber layer 2 and to provide one end of the ground wire 41 with a ground terminal that is inserted into the socket. This has the advantage of making it possible to attach and detach the wire.

[0045] On the other hand, the tip of the earth wire 41 is connected to an earth terminal, which is a member for connecting to the earth and stably holding it. The shape of the earth terminal is not particularly limited, and may be, for example, an alligator clip, a USB connector, or a conductive magnet. In particular, in the case of a magnet, it is possible to attach it to a conductive member by magnetic force and to freely attach it to a desired position.

[0046] By keeping the above range, this mat 1 can suppress the intensity of extremely low frequency electromagnetic waves when the coating material dries to a range that does not affect the health of residents. As an objective standard, it is preferable to adopt the value set by the TOC regulation of the Swedish Trade Union Association, although this is not limited to this. A specific value is a state in which the electric field value measured by an electromagnetic wave measuring device (Fauser Field Meter FM6T) is 25V / m or less when a power of 1400V·A is supplied from a 200V power supply.

[0047] Incidentally, by placing the present mat 1 on a desk, it is possible to efficiently suppress electromagnetic waves, and as a result, it can be used as a method for suppressing electric fields. Specifically, the electric field suppression method according to this embodiment (hereinafter referred to as "the present method") includes the steps of (S1) placing a mat having a conductive fiber layer containing conductive fibers on a table, and (S2) grounding via a ground wire. This makes it possible to provide an efficient method for suppressing electric fields.

[0048] As described above, the present embodiment can provide a mat that can easily suppress electromagnetic wave propagation indoors and an electric field suppression method using the mat. EXAMPLES

[0049] Here, we actually created a desk mat and confirmed the effectiveness of this mat.

[0050] First, a conductive nonwoven fabric made of Digenite with a thickness of 1 mm, length of 300 mm and width of 300 mm was prepared as a conductive fiber layer, and a vinyl resin layer with a thickness of 3 mm was formed on top of it as a surface layer to make a desk mat with a thickness of about 4 mm. An earth wire was connected to the conductive fiber layer so that it could be grounded.

[0051] First, a study desk with a commercially available wiring plug embedded in the surface panel was prepared, and the wiring plug was connected to a household power source (AC: 100V, 50Hz). The electric field at five points on the surface was checked, and the average value was 216V / m, as shown in the table below. [Table 1]

[0052] Next, the desk mat prepared above was placed and connected to earth, and the electric field on its surface was checked. As shown in the table below, the average was 2.2 V / m, confirming that the electric field was sufficiently suppressed. [Table 2]

[0053] As described above, the effect of the present mat was confirmed by this embodiment. [Industrial Applicability]

[0054] The present invention has industrial applicability as an electric field suppression method using a mat.

Claims

1. A mat comprising a conductive fiber layer containing conductive fibers.

2. The mat according to claim 1 , further comprising a surface layer on said conductive fiber layer.

3. 2. The mat according to claim 1, further comprising a ground wire and a ground terminal connected to said conductive fiber layer.

4. 2. The mat according to claim 1, wherein the conductive fibers are made of basic fibers and a conductive material formed as a coating around the basic fibers.

5. 5. The mat of claim 4, wherein the conductive material comprises Digenite.

6. 2. The mat according to claim 1, wherein the conductive fiber layer contains the conductive fibers in an average amount of 1 g to 30 g per square meter.

7. 2. The mat according to claim 1, wherein 80% or more of the conductive fibers are short fibers having a length of 2 mm or more and 4 mm or less.

8. 2. The mat according to claim 1, wherein the surface resistance value of the conductive fiber layer is 80 Ω / □ to 300 Ω / □.

9. 2. The mat according to claim 1, wherein the conductive fiber layer has a thickness in the range of 1 mm to 5 mm.

10. placing a mat having a conductive fiber layer containing conductive fibers on a table; A method of suppressing an electric field comprising the step of grounding the mat by connecting a ground wire to the mat.

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