JP4388108B2 - Communication device - Google Patents

Description

  The present invention relates to a communication device used so as to be positioned between a device that transmits a signal and a detection device that detects the signal.

In recent years, communication devices that transmit and receive information by inducing an electric field between an electric field transmission medium such as a human body and the ground have been developed (see Non-Patent Document 1).
"RedTacton", [online], Nippon Telegraph and Telephone Corporation, [March 8, 2007 search], Internet <URL: http://www.redtacton.com/>

  Especially in recent years, it has become possible to reduce the size of communication devices. Therefore, such a communication device may be inadvertently used with an RF-ID system. Specifically, as shown in FIG. 6, the communication device 10 may be held over a stationary device 102 together with a card-type device 101 used in the RF-ID system.

  Thus, the communication device 10 blocks the signal between the device 101 and the device 102, which causes a problem that communication between the device 101 and the device 102 cannot be performed.

  The present invention has been made in view of the above problems, and an object of the present invention is to prevent the occurrence of a problem that communication between a device that transmits a signal and a detection device that detects the signal cannot be performed. An object of the present invention is to provide a communication device that can perform the above-described operation.

  The present invention according to claim 1 is an electrode disposed at a place where an electric field is induced when an electric field having a waveform electric field strength corresponding to information to be transmitted is induced between the electric field transmission medium and the ground, A communication device including a detection circuit that amplifies the voltage of an electrode and detects the information based on the waveform after amplification, or an oscillation circuit that applies a voltage having a waveform corresponding to the information to the electrode. The communication device is characterized in that it is used so as to be positioned between the transmitting device and the detecting device for detecting the signal, and the electrode is configured so that the signal reaches the detecting device.

  According to the first aspect of the present invention, since the electrode is configured so that the signal reaches the detection device, there is a problem that communication between the device that transmits the signal and the detection device that detects the signal cannot be performed. Can be prevented.

  According to a second aspect of the present invention, there is provided the communication device according to the first aspect, wherein the electrode is divided.

  According to the second aspect of the present invention, since the electrodes are divided, it is possible to prevent the occurrence of a problem that a signal reaches the detection device and communication cannot be performed. Further, it is more preferable because a gap is formed by the electrode division, and the possibility that the gap crosses the position of the antenna generating the signal is increased.

  According to a third aspect of the present invention, there is provided the communication device according to the first aspect, wherein the electrode includes an opening.

  According to the third aspect of the present invention, since the electrode is provided with the opening, it is possible to prevent the occurrence of the problem that the signal reaches the detection device and communication cannot be performed.

  According to a fourth aspect of the present invention, there is provided the communication device according to the third aspect, wherein the opening is a slit.

  According to the fourth aspect of the present invention, since the opening is a slit, the possibility that the opening crosses the position of the antenna that generates the signal is more preferable.

  The present invention according to claim 5 is characterized in that the communication device includes a second electrode facing the first electrode which is the electrode, and the detection circuit is arranged so as to avoid a gap between the two electrodes. The communication device according to any one of claims 1 to 4 is used as a solving means.

  According to the fifth aspect of the present invention, since the detection circuit is arranged so as to avoid the gap between the electrodes, the noise from there is not superimposed on the electric field between the electrodes, thereby preventing the problem that information cannot be detected. it can.

  According to the present invention, since the electrode is configured so that the signal reaches the detection device, it is possible to prevent the problem that the communication between the device that transmits the signal and the detection device that detects the signal cannot be performed. it can.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a diagram illustrating a communication device 1 according to the first embodiment and a state when the communication device 1 is used together with a card-type device used in an RF-ID system. Is shown disassembled. FIG. 2 is a circuit diagram of the detection circuit 11 provided in the communication device 1.

  An RF-ID system is a system that transmits and receives signals by an electromagnetic coupling method, an electromagnetic induction method, a radio wave method, and the like, thereby reading and writing data.

  The communication device 1 detects information transmitted from a partner communication device (not shown).

  The communication device 1 includes a card-type case 1c, a detection circuit 11 therein, a power source S, electrodes, and the like. The detection circuit 11 is accommodated in the housing 11c.

  In the communication device 1, electrodes PS1 and PG1 are provided so as to sandwich the housing 11c. Electrodes PS2 and PG2 are provided so as to sandwich the power source S.

  The electrodes PS1 and PS2 and the electrodes PG1 and PG2 are electrically connected by lead wires or the like, respectively.

  The electrode PS1 is electrically connected to the input terminal of the amplifier in the detection circuit 11 by a lead wire or the like. The electrode PG1 is electrically connected to the ground wiring in the detection circuit 11 by a lead wire or the like.

  In this embodiment, a medium (referred to as an electric field transmission medium) in which an electric field having an electric field intensity having a waveform corresponding to information to be transmitted is transmitted by a partner communication apparatus such as a human body of a user who owns the communication apparatus 1. And induced between the earth.

  Thereby, an electric field is induced between the electrodes PS1 and PG1 and between the electrodes PS2 and PG2 of the communication device 1.

  The detection circuit 11 of the communication device 1 amplifies the voltage of the electrode PS1 with reference to the potential of the ground wiring that conducts to the electrode PG1, and detects information from the amplified waveform.

  On the other hand, when information is transmitted to the other communication device, the detection circuit 11 is replaced with, for example, the circuit 12 shown in FIG.

  The electrode PS1 is electrically connected to the input terminal of the amplifier and the output terminal of the oscillator in the circuit 12 by a lead wire or the like. The electrode PG1 is electrically connected to the ground wiring in the circuit 12 by a lead wire or the like.

  In the circuit 12 for transmitting information to the counterpart communication device, the oscillator applies a voltage having a waveform corresponding to the information to the electrode PS1. Thereby, an electric field having an electric field intensity corresponding to information is induced between the electric field transmission medium and the ground.

  Thereby, the communication apparatus of the other party detects information in the same manner as the communication apparatus 1. Note that the information detection function may be omitted from the communication device 1 if only information is transmitted to the other communication device.

  Now, the communication apparatus 1 may be used with an RF-ID system. Specifically, the communication device 1 may be held over the device 102 that is a detection device that detects a signal transmitted from the device 101 together with the device 101 used in the RF-ID system.

  The reason why the electrodes PS1 and PS2 are provided is that the electrode that is originally required to be one is divided into the electrodes PS1 and PS2, and the electrodes PG1 and PG2 are also originally required to be only one.

  Since the detection circuit 11 and the power source S are arranged so as not to cover the gap between the divided electrodes, a signal arrives from the apparatus 101 to the apparatus 102, and from the apparatus 102 to the apparatus 101. It is possible to prevent the problem that communication between the devices 102 cannot be performed.

  In addition, as shown to Fig.4 (a), you may divide | segment an electrode into three or more.

  Further, as shown in FIG. 4B, the electrodes PS1 and PS2 or the electrodes PG1 and PG1 may be configured by one electrode (illustrated as an electrode P), and the electrode P may be provided with an opening OP. . Further, the opening OP may be a slit.

  It is more preferable to divide the electrodes and to make the openings OP into slits because the possibility of the gap between the electrodes and the opening OP crossing the position of the antenna that generates the signal of the RF-ID system increases. .

[Second Embodiment]
FIG. 5 is a diagram showing a state when the communication apparatus 1A according to the second embodiment and the card-type apparatus used in the RF-ID system are used. Is shown disassembled.

  The communication device 1 </ b> A communicates with the other party similarly to the communication device 1, and is configured in substantially the same manner as the communication device 1. Here, the same reference numerals are given to the constituent elements, and a duplicate description will be omitted, and description will be made focusing on the configuration and operation unique to the communication device 1A.

  In the communication device 1A, the electrode PG1 faces the outside of the casing 11c of the detection circuit 11. Further, the electrode PS1 faces the outside of the housing 11c via the electrode PG1 and an insulating sheet IS1 (paper or the like).

  Further, the electrode PG2 faces the outside of the power source S. The electrode PS2 faces the outside of the power source S via an electrode PG2 and an insulating sheet IS2 (paper or the like).

  Considering the electrodes PG1 and PG2 as one electrode PG and the electrodes PS1 and PS2 as one electrode PS, in the first embodiment, the detection circuit 11 is provided between the electrodes PS and PG. Is superimposed on the electric field between the electrodes, causing a problem that information cannot be detected.

  Therefore, by providing the detection circuit 11 so as to avoid the gap between the electrodes PS and PG as described above, there is a problem that noise from the detection circuit 11 is not superimposed on the electric field between the electrodes PS and PG and information cannot be detected. Can be prevented.

  Specifically, the detection circuit 11 is housed in the housing 11c, the electrode PG is opposed to the outside of the housing 11c, and the electrode PS is opposed to the outside of the housing 11c via the electrode PG. can get.

  Moreover, the distance between the electrodes can be shortened by providing the detection circuit 11 while avoiding the gap between the electrodes PS and PG. Thereby, noise intrusion between electrodes other than the detection circuit 11 can be prevented.

It is a figure which shows a mode when the communication apparatus 1 which concerns on 1st Embodiment, and it is used with the card-type apparatus etc. which are used with an RF-ID system. 3 is a circuit diagram of a detection circuit 11 provided in the communication device 1. FIG. 2 is a circuit diagram of a circuit 12 that can be replaced with a detection circuit 11. FIG. It is a figure which shows the modification about an electrode. It is a figure which shows a mode when the communication apparatus 1A which concerns on 2nd Embodiment, and it is used with the card-type apparatus etc. which are used with an RF-ID system. It is a figure for demonstrating the problem with which a communication apparatus is provided.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1A ... Communication apparatus 11 ... Detection circuit 11c ... Housing 101, 102 ... Apparatus used by RF-ID system OP ... Opening P, PG, PS, PG1, PG2, PS1, PS2 ... Electrode IS1, IS2 Insulation Sheet S ... Power supply

Claims (5)

An electrode disposed at a location where an electric field is induced when an electric field having a waveform electric field intensity according to information to be transmitted is induced between the electric field transmission medium and the ground, and amplifies the voltage of the electrode and after amplification A communication circuit including a detection circuit that detects the information based on the waveform of, or an oscillation circuit that applies a voltage having a waveform corresponding to the information to the electrode,
The electrode is used to be positioned between a device for transmitting a signal and a detection device for detecting the signal;
The communication device, wherein the electrode is configured so that a signal reaches the detection device. The communication device according to claim 1, wherein the electrode is divided. The communication device according to claim 1, wherein the electrode includes an opening. The communication device according to claim 3, wherein the opening is a slit. The communication device
A second electrode facing the first electrode as the electrode;
The detection circuit includes:
The communication device according to any one of claims 1 to 4, wherein the communication device is arranged so as to avoid a gap between the two electrodes.

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