JP2013135358A - Antenna, communication device, and electric field communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antenna for electric field communication that is capable of solving problems of a conventional art, that is applied to electric field communication means inducing an electric field to an electric field communication medium to perform communication, that is flexible and pliable, and that is strong against bending and tensile force, and to provide a communication device, one or more pairs of communication devices, and an electric field communication system.SOLUTION: An antenna for electric field communication is applied to electric field communication means inducing an electric field to an electric field communication medium to perform communication. The antenna includes a conductive layer containing a binder (A) and a conductive material (B).

Description

  The present invention relates to an antenna, a pair of communication devices, and an electric field communication system that are flexible and flexible, and are strong against bending and pulling, applied to an electric field communication means that induces an electric field in an electric field transmission medium to perform communication.

  Computers (wearable computers) that have been reduced to a size that can be worn on the body due to miniaturization and high performance of portable terminals have attracted attention. And development of the technique which connects the portable terminal which applied the wearable computer to the electric field communication apparatus, and performed communication between portable terminals by an electric field is advanced. (Patent Document 1)

  As a basic function of the electric field communication device, an electric field is induced in an electric field transmission medium such as a human body based on information to be transmitted at the time of signal transmission, and a signal is detected based on the received electric field at the time of signal reception.

  FIG. 1 shows an image diagram when electric field communication is performed between a plurality of portable terminals via a human body. In the figure, a person having a portable terminal 1 having an antenna 2 is in contact with a person having a portable terminal 1 having another antenna 2. At this time, data communication can be performed with respect to the antenna connected to the electric field communication device by inducing an electric field in the human body through the set of electric field communication antennas 2.

  FIG. 2 also shows that the portable terminal 1 provided with each antenna 2 is connected to the electric field communication device 4′a when the human body contacts the antenna 3′a of the electric field communication device 4′a installed on a wall or the like. It is possible to perform data communication with a personal computer 5 connected through a communication line. Further, when the human body comes in contact with the antenna 3'b of the electric field communication device 4'b installed on the floor, data communication is performed with the personal computer 5 connected to the electric field communication device 4'b through a communication line. Is also possible.

  When these antennas are used in wearable computer portable devices, it is ideal that they are equipped around the human body, such as cards, bags, watches, clothes, and shoes, and the antenna itself is flexible and flexible. Is preferably provided.

  However, the electrodes that have been used for such antennas so far are rigid electrodes such as copper foil, conductive cloth knitted in a mesh shape, copper plate, etc. As a result, the electrode is easily damaged, and a strong sense of incongruity is felt when a person uses the device for a long time, so that it is not suitable for use as a wearable computer. (Patent Document 2)

  It has been proposed to provide elasticity by forming a structure containing air in an insulating layer between electrodes (Patent Document 3). However, since the electrode portion does not have flexibility, the conductivity of the electrode is gradually lost by bending or pulling, and there is a fear that the electrode may eventually be damaged.

JP 2003-98205 A Japanese Patent No. 4653200 Japanese Patent No. 4628439

  The object of the present invention is to overcome the conventional problems and apply it to electric field communication means for inducing communication by inducing an electric field in an electric field transmission medium. The electric field communication is flexible and flexible, and is strong against bending and pulling. An antenna, a communication device, and an electric field communication system are provided.

  That is, the present invention is an antenna applied to an electric field communication means for performing communication by inducing an electric field in an electric field transmission medium, wherein the antenna contains a binder (A) and a conductive material (B). The present invention relates to an antenna for electric field communication characterized by comprising a layer (1)).

  The present invention also relates to the above-mentioned antenna for electric field communication, wherein the antenna is an antenna formed by laminating an insulating layer (0) and a first conductive layer (1).

  In the present invention, the antenna is formed by laminating the first insulating layer (0), the first conductive layer (1), the second insulating layer (2), and the second conductive layer (3) in this order. The above-mentioned antenna for electric field communication, wherein the second conductive layer (3) contains a binder (A) and a conductive material (B).

  In the present invention, the antenna includes a first insulating layer (0), a first conductive layer (1), a second insulating layer (2), a second conductive layer (3), a third insulating layer ( 4) An antenna, which is further laminated in the order of the third conductive layer (5), wherein the third conductive layer (5) comprises a binder (A) and a conductive material (B). It contains about the said antenna for electric field communication characterized by containing.

  The present invention also relates to the above-mentioned antenna for electric field communication, wherein the relative dielectric constant (εr) of the second insulating layer (2) is less than 5.

  The present invention also relates to the above-mentioned antenna for electric field communication, wherein the relative dielectric constant (εr) of the second insulating layer (2) is less than 3.

  The present invention also relates to the above-mentioned electric field communication antenna, wherein the second insulating layer (2) contains air.

  Further, the present invention is a communication device applied to an electric field communication means that performs communication by inducing an electric field in an electric field transmission medium, and includes the electric field communication antenna, a control unit, and a modulation unit and / or a demodulation unit. The present invention relates to a communication device for electric field communication.

  Further, the present invention is two or more communication devices applied to an electric field communication means for performing communication by inducing an electric field in an electric field transmission medium, and at least one of the communication devices includes the electric field communication antenna. And a control unit, and a modulation unit and / or a demodulation unit.

  The present invention overcomes the conventional problems, is flexible and flexible, strong against bending and pulling, and can be used without a sense of incongruity even when a person wears or touches for a long time. An electric field communication antenna, a communication device, and an electric field communication system are provided.

FIG. 1 is an image diagram when electric field communication is performed between a plurality of portable terminals via a human body. FIG. 2 is an image diagram when electric field communication is performed on a fixed terminal via a human body between a plurality of portable terminals. FIG. 3 is a schematic cross-sectional view of the antenna of the present invention. FIG. 4 is a schematic cross-sectional view of the antenna of the present invention. FIG. 5 is a schematic cross-sectional view of the antenna of the present invention. FIG. 6 is a schematic cross-sectional view of the antenna of the present invention.

  The antenna of the present invention will be described.

  The antenna constituting the present invention is a first conductive layer (1) containing a binder (A) and a conductive material (B) (FIG. 3).

  In the prior art, rigid materials such as copper foil, conductive cloth knitted in a mesh shape, copper plate, etc. were used, but they were easily damaged by strain such as pulling or bending, and the conductivity was severely reduced. In the case of a mesh-like conductive cloth, there is a problem that the fiber is likely to break due to wear, and copper foil and copper plate are oxidized by body fluids and humidity such as human sweat and sebum, and the conductivity is lowered, There was a problem of giving a strong sense of incongruity by wearing for a long time because it is rigid.

  On the other hand, in the antenna constituting the present invention, the binder (A) gives the entire conductive layer flexibility as a dispersion medium of the rigid conductive material (B), and stress is applied to strains such as tension and bending. By maintaining the conductivity, the antenna can be prevented from being destroyed while being conductive, and further, the surface of the conductive material (B) can be prevented from being oxidized by body fluids such as human sweat and sebum. The above problem can be solved.

  Since the antenna constituting the present invention is used on a part that a person wears directly or touches for a long time, an insulating layer is provided in the sense that it realizes safer communication with the human body and gives a feeling of incongruity. (0), a first conductive layer (1) containing a binder (A) and a conductive material (B) is preferably laminated. The conductive layer (1) is preferably disposed so as to be in indirect contact with the insulating layer (0) (FIG. 4).

  In order to induce electrolysis more effectively and perform more stable communication, the antenna constituting the present invention has a first insulating layer (0), a first conductive layer (1), a second insulating layer ( 2) It is preferable that the antenna is formed by laminating the second conductive layer (3) in this order (FIG. 5). The second insulating layer (2) has a structure sandwiched between the first conductive layer (1) and the second conductive layer (3), and the first conductive layer (1) and the second conductive layer (2). Since the layer (3) serves as an electrode and the second insulating layer (2) serves as a dielectric, a capacitor structure is formed, so that an electric field can be induced more stably and electrolysis can be detected efficiently. .

 At this time, a circuit is formed by using the first conductive layer (1) as a + side communication electrode and the second conductive layer (3) as a-side communication electrode. By forming a circuit using the other as a ground electrode, a more stable function as a communication antenna is exhibited.

  The first insulating layer (0) constituting the present invention will be described.

  The first insulating layer (0) is an outermost surface layer that is a portion that is directly touched by a person in the antenna constituting the present invention, and electrically insulates the first conductive layer (1) from the outside, and It plays a role of physical protection.

  Practically, since the first insulating layer (0) exists between the person and the first conductive layer (1) at the time of communication, an excessive current is generated from the antenna to the person due to a malfunction of the device. It prevents the fluid from flowing, prevents irritation to the skin, and gives a feeling of use that does not give a sense of incongruity. In addition, the first conductive layer (from body fluids such as sweat and sebum, scratches, wear, etc.) It plays a role to protect 1).

Since the antenna for electric field communication of the present invention needs flexibility and flexibility, the first insulating layer (0) is required to be flexible and rich in flexibility. Specifically, fluorine resin, acrylic resin, polyester resin, polyester urethane and polyether urethane, urethane resin such as polycarbonate urethane, urethane urea resin such as polyester urethane urea and polycarbonate urethane urea, polyester urea and polyether Urea resin such as urea, polycarbonate urea, olefin resin such as polyethylene, polypropylene, acrylonitrile-butadiene-styrene resin, polyacetal resin such as polyvinyl alcohol and polyvinyl butyral, polyamide resin, polyimide resin, epoxy resin Synthetic resin such as phenoxy resin, polyphenol resin, nylon resin, vinylon resin, aramid resin, cellulose resin, etc. Resin compositions containing various additives for imparting curing agents for crosslinking these resins, catalysts for accelerating them, and other coating properties, stability, durability, etc. Non-woven fabrics, natural fibers such as cotton, silk, hemp, and wool, and glass fibers can be used.

  The first insulating layer (0) may have a practically optimal film thickness for electrically insulating the first conductive layer (1) from the outside and physically protecting the antenna. It is difficult to physically protect one conductive layer (1) and to ensure insulation between the first conductive layer (1) and the outside, and if it is too thick, it is difficult to detect an electric field as an antenna. , Preferably less than 100000 μm.

  The first conductive layer (1) and the second conductive layer (3) constituting the present invention will be described in more detail.

  The first conductive layer (1) and the second conductive layer (3) bear the electrode portion of the antenna constituting the present invention.

  It is important that the first conductive layer (1) and the second conductive layer (3) contain a binder (A) and a conductive material (B). That is, by dispersing the conductive material (B) in the binder (A), as described above, flexibility can be imparted to the entire conductive layer while maintaining conductivity, and the antenna is prevented from being destroyed. Or giving a feeling of incongruity even when worn for a long time, or suppressing own oxidation by body fluids such as human sweat and sebum.

  As the binder (A), fluorine resin, acrylic resin, polyester resin, urethane resin such as polyester urethane and polyether urethane, polycarbonate urethane, urethane urea resin such as polyester urethane urea and polycarbonate urethane urea, polyester urea, Urea resin such as polyether urea and polycarbonate urea, olefin resin such as polyethylene, polypropylene, acrylonitrile-butadiene-styrene resin, polyacetal resin such as polyvinyl alcohol and polyvinyl butyral, polyamide resin, polyimide resin, epoxy Main component: resin, phenoxy resin, polyphenol resin, nylon resin, vinylon resin, aramid resin, cellulose resin Resin compositions containing various additives for imparting a curing agent for crosslinking these resins and a catalyst for accelerating them as required, other coating properties, stability, durability, etc. If necessary, two or more of these materials may be mixed and used. Among them, it is preferable that fluorine, acrylic or olefin rubber, polyester resin, urethane resin, urethane urea resin, urea resin, epoxy resin, and phenoxy resin are the main components.

  Examples of the conductive material (B) include general conductive particles and conductive resins. Specifically, metal particles such as gold, silver, copper, platinum, nickel, tin, palladium, aluminum, and alloys, core-shell particles, metal nanowires, metal fibers, ITO, ATO, FTO, etc. Material particles, alloys using them, core-shell type particles, carbon materials such as graphite, graphene, and carbon nanotubes, conductive resins such as polyaniline and PEDOT, ionic liquids, and the like. You may mix and use two or more.

  When the first conductive layer (1) and the second conductive layer (3) are too thin, the conductivity is lowered, and when they are too thick, the flexibility as an antenna is lowered. Therefore, the thickness is 0.1 μm or more and less than 10,000 μm. It is preferable.

  The second insulating layer (2) will be described. The second insulating layer (2) has a structure sandwiched between the first conductive layer (1) and the second conductive layer (3), and the second insulating layer (2) serves as a dielectric. Thus, since the capacitor structure is formed, the antenna of the present invention can induce and detect an electric field more stably.

  Since the electric field communication antenna of the present invention requires flexibility and flexibility, the second insulating layer (2) is also required to be flexible and flexible. Specifically, fluororesin, acrylic resin, polyester resin, polyester urethane and polyether urethane, urethane resin such as polycarbonate urethane, urethane urea resin such as polyester urethane urea and polycarbonate urethane urea, polyester urea and polyether Urea resin such as urea, polycarbonate urea, olefin resin such as polyethylene, polypropylene, acrylonitrile-butadiene-styrene resin, polyacetal resin such as polyvinyl alcohol and polyvinyl butyral, polyamide resin, polyimide resin, epoxy resin , Phenoxy resin, polyphenol resin, nylon resin, vinylon resin, aramid resin, cellulose resin, etc. Examples include a curing agent for crosslinking these resins, a catalyst for accelerating them, and resin compositions containing various additives for imparting coating properties, stability, durability, etc. Accordingly, two or more of these materials may be mixed and used. Among them, in consideration of flexibility and dielectric constant, the main components are halogen-free acrylic or olefin rubber, polyester resin, urethane resin, urethane urea resin, urea resin, epoxy resin, and phenoxy resin. It is preferable to do.

The performance of the antenna constituting the present invention is related to the surface resistance value of the conductive layer in the case of a configuration having only one conductive layer, and is 1 × 10 ⁻⁴ to 1 × 10 ⁸ [Ω / □]. Is preferably 1 × 10 ⁻² to 1 × 10 ⁶ [Ω / □]. If the surface resistance value is smaller than 1 × 10 ⁻⁴ [Ω / □], there is a problem that stable communication is not easily performed due to the influence of noise around the communication environment, which is larger than 1 × 10 ⁸ [Ω / □]. In this case, there is a problem that the electric field cannot be induced stably, and stable communication becomes difficult.

The performance of the antenna constituting the present invention is improved by increasing the impedance (Z) of the antenna in the case of a configuration having two or more conductive layers, and this impedance is the capacitance of the antenna (C: capacitance). There is a correlation, and the relationship can be expressed by the following equation.
Z = 1 / (jωC)
C = εo · εr (S / d)
Z: impedance, j: imaginary unit, ω: angular frequency C: capacitance, εo: dielectric constant in vacuum, εr: relative dielectric constant of the second insulating layer S: area of the conductive layer, d: second Insulation layer thickness

  In the above relational expression, the smaller the capacitance (C) of the antenna, the larger the impedance (Z), and the signal can be detected stably. In order to reduce the value of the capacitance (C), the smaller the values of the relative dielectric constant (εr) and the area (S) of the conductive layer of the second insulating layer (2), The larger the thickness (d) of the second insulating layer, the better. However, under practically limited conditions, if the area (S) is too small, the contact area with which the person touches becomes small, making it difficult to use practically, and if the film thickness (d) is too large, the electrolysis is stably induced. It becomes difficult to perform stable communication.

Specifically, the area of the conductive layer (S) is, 0.1 cm ² or more and less than 10000 cm ^2. If it is less than 0.1 cm ² , the contact portion becomes small, making it difficult to use practically, and if it is 10000 cm ² or more, the value of the capacitance (C) is too large to induce electrolysis stably. It becomes difficult to perform stable communication.
The film thickness (d) of the second insulating layer is preferably 0.1 μm or more and less than 100,000 μm, more preferably 3 μm or more and less than 50000 μm. When the thickness is less than 0.1 μm, the insulating layer is easily broken by a slight impact from the outside, and the conductive layers are short-circuited to make stable communication difficult. When the thickness is 100000 μm or more, electrolysis is stably induced. It becomes difficult to perform stable communication.

  Since the area (S) and the film thickness (d) of the second insulating layer are often determined in advance depending on the intended use, in order to improve the performance of the antenna, the value of the relative dielectric constant (εr) It is important to reduce the capacitance (C) by making the value as small as possible. The value of the relative dielectric constant (εr) of the second insulating layer (2) is preferably less than 5, preferably less than 3, although it depends on the intended use. If it is 5 or more, the value of the capacitance (C) is too large, and it becomes difficult to stably detect the electric field.

  The second insulating layer (2) preferably contains air. When the second insulating layer (2) contains air, the relative dielectric constant of the second insulating layer (2) can be lowered, and elasticity can be further imparted. As the material, those in which air is contained in the main component of the second insulating layer (2) are preferable, and examples thereof include foam coating sheets, urethane foam, and polystyrene. In order to include air, a method of physically making holes in the insulating layer with a laser or a load, a method of creating holes by a stretching method or a phase separation method, etc., coating in a state where bubbles are included by melting in a liquid However, there are a method of fixing bubbles by cooling, a method of including a foam material, and the like.

  The antenna for electric field communication according to the present invention includes a third insulating layer (4), a binder (A), and a conductive material (B) on the surface of the second conductive layer (3). It is preferable that the conductive layers (5) are further laminated in this order. In this case, the first insulating layer (0), the first conductive layer (1), the second insulating layer (2), the second conductive layer (3), the third insulating layer (4), the third 6 conductive layers (5) (FIG. 6).

 At this time, a circuit is formed using the first conductive layer (1) as the + side communication electrode, the second conductive layer (3) as the-side communication electrode, and the third conductive layer (5) as the ground electrode. Alternatively, a circuit is formed using the first conductive layer (1) as the + side communication electrode, the second conductive layer (3) as the ground electrode, and the third conductive layer (5) as the-side communication electrode. Thus, since the influence of noise or the like received from the external environment can be reduced, the performance as an antenna is improved and more stable communication can be performed.

The third insulating layer (4) can be the same as the second insulating layer (2).
The third conductive layer (5) can be the same as the first conductive layer (1) or the second conductive layer (3).

  For the purpose of detecting more stable and weak electrolysis, the antenna constituting the present invention may be further laminated in multiple layers as required, such as a fourth insulating layer and a fourth conductive layer. Is possible.

  The communication device of the present invention will be described. The communication device of the present invention is a communication device applied to an electric field communication means for inducing communication by inducing an electric field in an electric field transmission medium. The antenna, the control unit, the modulation unit and / or the demodulation unit of the present invention, and further, necessary The communication device for electric field communication provided with an interface according to the above.

  The control unit is a part that performs control related to transmission / reception of communication, and includes a microcomputer having an information processing function. The modulation unit is a part that puts the signal sent from the control unit on a carrier wave, and the demodulation unit is a part that extracts data from the modulation signal. The demodulator and the modulator may be mounted at the same time, or only one of them may be provided. The interface is a part for inputting / outputting data to / from an external device.

  For example, when data is transmitted using the communication device of the present invention, the data to be transmitted from the data in the portable terminal is sent to the modulation unit by the control unit, an electric field is generated through the antenna, and the electric field is generated using the electric field Communication data can be transmitted.

  Also, when it is desired to receive data using the communication device of the present invention, the antenna detects an electric field and then sends it to the demodulator, and transmits the demodulated electric field to the controller. The control unit can process the received data and record it on a recording device through an interface or output it to a display device.

  The antenna of the present invention may not have the same configuration as the control unit, the demodulation unit, the modulation unit, and the interface, and the antenna unit may be independently connected to the control unit, the demodulation unit, and the modulation unit.

An electric field communication system using the communication device of the present invention will be described.
In the electric field communication system of the present invention, since the antenna of the communication device of the present invention is flexible and flexible, and is strong against bending and pulling, it can follow curved surfaces and irregularities. , Clothing such as belts, watches, hats, car supplies such as seat belts, seats and handles, bicycles and motorcycles such as grips, saddles, helmets, chairs, desks, beds, sofas, futons, cushions, sheets, pillows, etc. Daily commodities, mouse, mouse pad, keyboard, smart phone, smartphone cover, mobile phone, mobile phone cover, tablet PC, tablet PC cover peripheral equipment, golf clubs, tennis rackets, bats, training machines, etc. Parts, gloves, supporters, swimming wear, dry suits, wet Sports equipment such as suits, pets such as collars, wheelchair seats, crutch grips, blood pressure monitors, bandages, casts and other medical devices, walls, carpets, toilet seats, toilet seat covers, carpets, etc. Thus, information can be transmitted and received without a sense of incongruity.

  By combining the biosensor or the biocommunication device and the communication device of the present invention, the detected biometric information can be transmitted to the external device via the human body, and the biometric information can be easily collected. At this time, since the human body configures a communication path between the biological information and the external device, if the communication device of the external device is touched while the communication device of the present invention is mounted, the biological information can be easily transmitted by the external device. Can be collected.

  When the electric field communication means is used for data transmission / reception, two or more communication devices are required. In this case, two or more communication devices are one transmitter and one receiver, one transmitter and two or more receivers, two or more transmitters and one receiver, and two or more. One of two transmitters and two or more receivers. These transmitters and receivers may be transceivers having both transmission and reception functions.

  In the present invention, at least one of the two or more communication devices is a communication device including the electric field communication antenna of the present invention, a control unit, a modulation unit and / or a demodulation unit. Need.

  For example, by using the two communication devices of the present invention as a transmitter and a receiver, it is possible to communicate between two persons having portable terminals via a human body. Further, by using the communication device of the present invention as a transmitter, it is possible to communicate via a human body to a receiver having no flexibility other than the present invention.

  Hereinafter, the present invention will be described in more detail with reference to examples. In the examples, “part” means “part by weight” and “%” means “% by weight”.

<Preparation of conductive layer solution 1>
As binder (A), 100 parts of phenoxy resin (manufactured by Mitsubishi Chemical Corporation, JER1256), as conductive material (B), 1500 parts of conductive particles (manufactured by Fukuda Metal Foil Industry Co., Ltd., AgXF-301), 5 parts of dicyandiamide and 400 parts of ethyl carbitol acetate were added and mixed by stirring to prepare a conductive layer solution 1 having a solid content of 80%.

<Preparation of Solution 2 for Conductive Layer>
As binder (A), 100 parts of polyester resin (manufactured by Sumika Bayer Urethane Co., Ltd., Desmocol 500) and 20 parts of epoxy resin (manufactured by Mitsubishi Chemical Corporation, JER828) are used as the conductive material (B). 180 parts of carbon (HS-100, manufactured by Denki Kagaku Kogyo Co., Ltd.), 5 parts of dicyandiamide, and 75 parts of ethyl carbitol acetate were added and mixed by stirring to prepare a conductive layer solution 2 having a solid content of 80%.

<Creation of electric field communication antenna 1>
The conductive layer solution 1 was applied on a 100 μm-thick release PET film whose surface was peeled by a silk screen printer, and after the solvent was dried, the PET film was peeled to form a 10 cm × 10 cm square. By cutting out, the antenna 1 for electrolytic communication was obtained as a conductive layer having a thickness of 20 μm.

<Creation of antenna 2 for electric field communication>
An electric field communication antenna 2 was prepared in the same manner as the electric field communication antenna 1 except that the conductive layer solution 2 was used instead of the conductive layer solution 1.

<Creation of antenna 3 for electric field communication>
A 100 μm thick polyester non-woven fabric cut into a 10 cm × 10 cm square as the first insulating layer was pressure-bonded to the electric field communication antenna 1 by heat lamination to produce an electric field communication antenna 3.

<Preparation of insulating layer film 1>
Polypropylene resin (manufactured by Prime Polymer Co., Ltd., Prime Polypro F109V) is kneaded and extruded with a twin screw extruder (manufactured by Nippon Placon Co., Ltd.) at a rotation speed of 300 rpm and a set temperature of 220 ° C., and then cut with a pelletizer and resin. A composition was obtained. Using the obtained resin composition, an insulating layer film 1 having a thickness of 100 μm was prepared using a T-die extruder under a setting temperature of 220 ° C.

<Creation of electric field communication antenna 4>
On the insulating layer film 1, the conductive layer solution 1 is applied by a silk screen printer, and after the solvent is dried, the conductive layer solution 1 is similarly applied to the surface opposite to this and dried. Then, a 100 μm polyester non-woven fabric as a first insulating layer was pressure-bonded to one conductive layer surface by heat lamination, and cut into a 10 cm × 10 cm square, thereby creating the electric field communication antenna 4.

<Creation of antenna 5 for electric field communication>
An electric field communication antenna 5 was prepared in the same manner as the electric field communication antenna 4 except that the conductive layer solution 2 was used instead of the conductive layer solution 1.

<Creation of antenna 6 for electric field communication>
An electric field communication antenna 6 was prepared in the same manner as the electric field communication antenna 4 except that a 100 μm thick polyester film (Tetron S10, manufactured by Toray Industries, Inc.) was used instead of the insulating layer film 1.

<Creation of electric field communication antenna 7>
An electric field communication antenna 7 was prepared in the same manner as the electric field communication antenna 4 except that a foamed polyethylene film (product name was added later) was used instead of the insulating layer film 1.

<Creation of antenna 8 for electric field communication>
An electric field communication antenna 8 was prepared in the same manner as the electric field communication antenna 4 except that a polyimide film having a thickness of 100 μm (manufactured by DuPont, Kapton 400H) was used instead of the insulating layer film 1.

<Creation of electric field communication antenna 9>
An electric field communication antenna 9 was prepared in the same manner as the electric field communication antenna 4 except that a fluororubber film (Daikin Co., Ltd., Daiel G-912) having a thickness of 100 μm was used instead of the insulating layer film 1. did.

<Creation of antenna 10 for electric field communication>
The conductive layer solution 1 was applied to one surface of the insulating layer film 1 by a silk screen printer, and the solvent was dried to prepare a first conductive layer of 20 μm. Thereafter, the other surface is similarly coated with the conductive layer solution 1 by a silk screen printer, the solvent is dried, a 20 μm second conductive layer is formed, and the first conductive layer-second insulating layer is formed. -A second conductive layer laminate was prepared. Further, the insulating layer film 1 is pressure-bonded to the second conductive layer surface of the laminate by heat lamination as a third insulating layer, and the conductive layer solution 1 is applied to the second insulating layer surface by a silk screen printer, The solvent was dried to prepare a 20 μm third conductive layer, and a first conductive layer-second insulating layer-second conductive layer-third insulating layer-third conductive layer laminate was prepared. .
Thereafter, a 100 μm polyester non-woven fabric as a first insulating layer was pressure-bonded to the first conductive layer surface by heat lamination, and cut into a 10 cm × 10 cm square to produce the electric field communication antenna 10.

<Creation of antenna 11 for electric field communication>
A copper foil having a thickness of 30 μm was bonded to both surfaces of the insulating layer film 1 to prepare a first conductive layer-second insulating layer-second conductive layer laminate.
Thereafter, a 100 μm polyester non-woven fabric as the first insulating layer was pressure-bonded to the first conductive layer side by heat lamination, and cut out into a 10 cm × 10 cm square to produce the electric field communication antenna 11.

Examples 1-9
<Creation of communication devices 1 to 9 for electric field communication>
In the case of the antenna having the first conductive layer (1) of the electric field communication antennas 1 to 9 as the communication electrode and the second conductive layer, the second conductive layer (3) is used as the ground electrode, and the control unit is modulated. Connected to a controller equipped with a demodulator or / and a demodulator to create communication devices 1 to 9 for electric field communication. As the performance of the antenna, the surface resistance value of the conductive layer, the dielectric constant of the insulating layer, described later, The capacitance of the antenna was measured. In addition, a tensile test and a bending test were performed, and capacitance and reception sensitivity were measured before and after the test.

<Method for measuring surface resistance of conductive layer>
The surface resistance value of the conductive layer of the antenna was measured using a surface resistance measuring device “Loresta AP” (4-terminal probe with an interval of 0.5 cm) manufactured by Mitsubishi Yuka Co., Ltd.

<Insulating layer dielectric constant measurement method>
The insulating layer was cut into a 1 cm square shape with a thickness of 800 μm, and the dielectric constant (value of 4 GHz) of the antenna insulating layer was measured using a dielectric constant measuring apparatus “ADMS01O” manufactured by AET Co., Ltd.

<Method for measuring capacitance of antenna>
Using a digital multimeter “34410A” manufactured by Agilent Technologies, the probe was connected to the conductive layer of the antenna, and the capacitance of the antenna was measured.

<Measurement of reception sensitivity>
When the created antenna is connected to a spectrum analyzer “MSA438” manufactured by Micronics Co., Ltd., and the signal source for card-type electrolytic communication with a carrier frequency of 6.75 MHz is placed on the left palm and the antenna is touched on the entire right palm And the difference in received intensity (ΔdBm, measurement condition: center frequency 6.75 MHz, span 5 MH) compared to when the antenna is touched without a signal generation source
z, RBW 30 kHz, VBW 10 kHz).

<Tensile test>
Based on JIS K7113, a sample processed into a dumbbell shape was subjected to a tensile treatment to values of 110%, 130%, and 150% using a tensile tester.
After performing the pulling process, the capacitance and reception sensitivity of the antenna were measured, and the respective change rates were determined as ◎ to × when
However, the rate of change here means that the original value is a and the value after processing is b.

Rate of change G = (b−a) / a × 100 [%]

Represents.

Capacitance change rate of 0% to less than 30%: ◎
30% to less than 60%: ○
60% or more and less than 100%: △
100% or more: ×

Change rate of reception sensitivity from 0% to less than 25%: ◎
25% or more and less than 50%: ○
50% or more to less than 100%: △
100% or more: ×

<Bending test>
The center part of the sample processed into a dumbbell shape similar to the tensile test was 1) bent at 180 degrees, and a 1 kg weight was placed on the bent part for 5 seconds. 2) Next, the bent portion was returned to the original flat state, and a 1 kg weight was placed on the same position for 5 seconds. The operations 1) to 2) were performed 10 times, 30 times, and 50 times on one sample.

Example 10
<Creation of communication device 10 for electric field communication>
Using the first conductive layer (1) of the electric field communication antenna 10 as a + side communication electrode, the second conductive layer (3) as a-side communication electrode, and the third conductive layer (5) as a ground electrode, A controller 10 including a control unit and a modulation unit or / and a demodulation unit is connected to create a communication device 10 for electric field communication. Similar to Example 1, the surface resistance value of the conductive layer and the dielectric constant of the insulating layer The capacitance of the antenna was measured. In addition, a tensile test and a bending test were performed, and capacitance and reception sensitivity were measured before and after the test.

Example 11
<Creation of communication device 11 for electric field communication>
The first conductive layer (1) of the electric field communication antenna 10 is a + side communication electrode, the second conductive layer (3) is a ground communication electrode, and the third conductive layer (5) is a-side communication electrode. The controller 11 having the control unit and the modulation unit or / and the demodulation unit is used to create a communication device 11 for electric field communication. As in the first embodiment, the surface resistance value of the conductive layer, the insulating layer The dielectric constant and the capacitance of the antenna were measured. In addition, a tensile test and a bending test were performed, and capacitance and reception sensitivity were measured before and after the test.

Comparative Example 1
<Creation of communication device 12 for electric field communication>
A communication device 12 was prepared in the same manner as the communication device 1 except that a conductive cloth “CSTK-250” manufactured by Kitagawa Industries Co., Ltd. cut into 10 cm × 10 cm was used instead of the electric field communication antenna 1. The same test as 1 was conducted.

Comparative Example 2
<Creation of communication device 13 for electric field communication>
A communication device 13 was created in the same manner as the communication device 3 except that a polyimide copper-clad laminate “Espanex M” manufactured by Nippon Steel Corporation was used instead of the electric field communication antenna 3. A test was conducted.

Comparative Example 3
<Creation of communication device 14 for electric field communication>
A communication device 14 was created in the same manner as in Example 4 except that the electric field communication antenna 11 was used in place of the electric field communication antenna 4, and the same test as in Example 4 was performed.

  As shown in Tables 2 and 3, Examples 1 to 11 have flexible and flexible conductive layers, so they are strong against bending and pulling, and are used for human body communication used in wearable computers. It is extremely excellent as a communication device. On the other hand, in Comparative Examples 1 to 3, since the conductive layer does not have flexibility and is inflexible, the conductive layer is destroyed by a bending test or a tensile test, so that physical resistance as an antenna for human body communication is insufficient. If you think about using it for wearable computers, you cannot use it.

  In Example 7, since the second insulating layer has air, the capacitance of the antenna is lower than in other examples, and stable communication can be performed against bending and pulling. On the other hand, in Examples 8 and 9, since the dielectric constant of the second insulating layer is high, the communication device is somewhat unstable.

DESCRIPTION OF SYMBOLS 1 Portable terminal 2 Antenna 3 Antenna 4 Electric field communication apparatus 5 Personal computer 11 First insulating layer 12 First conductive layer 13 Second insulating layer 14 Second conductive layer 15 Third insulating layer 16 Third conductive layer

Claims (9)

  An antenna applied to an electric field communication means for inducing an electric field in an electric field transmission medium to perform communication, wherein the antenna includes a conductive layer (1) containing a binder (A) and a conductive material (B). An electric field communication antenna.   The antenna for electric field communication according to claim 1, wherein the antenna is an antenna formed by laminating an insulating layer (0) and a first conductive layer (1).   The antenna is formed by laminating a first insulating layer (0), a first conductive layer (1), a second insulating layer (2), and a second conductive layer (3) in this order. The electric field communication antenna according to claim 1, wherein the second conductive layer (3) contains a binder (A) and a conductive material (B).   The antenna includes a first insulating layer (0), a first conductive layer (1), a second insulating layer (2), a second conductive layer (3), a third insulating layer (4), a third The third conductive layer (5) contains a binder (A) and a conductive material (B), wherein the antenna is further laminated in the order of the conductive layers (5). The antenna for electric field communication according to any one of claims 1 to 3.   The antenna for electric field communication according to claim 3 or 4, wherein the relative dielectric constant (εr) of the second insulating layer (2) is less than 5.   The electric field communication antenna according to any one of claims 3 to 5, wherein the relative dielectric constant (εr) of the second insulating layer (2) is less than 3.   The antenna for electric field communication according to any one of claims 3 to 6, wherein the second insulating layer (2) contains air.   A communication device that is applied to an electric field communication unit that performs communication by inducing an electric field in an electric field transmission medium, the electric field communication antenna according to any one of claims 1 to 7, a control unit, a modulation unit, and / or a demodulation unit And a communication device for electric field communication.   8. Two or more communication devices that are applied to an electric field communication means that performs communication by inducing an electric field in an electric field transmission medium, wherein at least one of the communication devices is an electric field according to claim 1. A communication system for electric field communication, comprising a communication antenna, a control unit, and a modulation unit and / or a demodulation unit.

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