JP2010161567A - Electrode device for electric-field communication, and electric-field communication system using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric-field communication system detecting that a person without carrying an electric-field communication terminal stands in front of a security door. <P>SOLUTION: In this electric-field communication system, the electrode device 1 including a floor mat-type electrode 11 for electric-field communication having a signal electrode 14 and a ground electrode 15 and a load sensor 12 installed on the lower side of the floor mat-type electrode for detecting a load applied to the floor mat-type electrode from the upper side is installed on a predetermined floor surface; a transmission/reception circuit 2 for transmitting/receiving an electric-field signal is connected to the signal electrode and the ground electrode; a load detection circuit 4 for determining presence of load application is connected to the load sensor 12; and a circuit 5 for determining a person carrying a terminal/a person without carrying a terminal which determines the person without carrying a terminal to be present when the transmission/reception circuit 2 does not receive ID information and the load detection circuit detects the load application is provided. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an electrode device for electric field communication that incorporates a load sensor and an electric field communication system that detects the presence of a non-portable person using the electrode device.

  For example, in a security door system using electric field communication, a floor mat type electric field communication electrode is installed on the floor in front of the security door, and a user carrying a portable terminal equipped with an electric field communication function When standing up, an electric field communication path between the electrode on the portable terminal side and the electric field communication electrode on the floor surface is established using the user's living body as a medium, and the portable terminal and the system side are equipped respectively. When electric field communication is started between transmission / reception devices for electric field communication as described in Japanese Patent No. 352298 (Patent Document 1) and ID information recorded in a portable terminal is transmitted, a server on the system side The ID information is verified, and if the verification is successful, the security door is unlocked and the security door is automatically opened, or the user can open the security door himself. It is trying to be.

  In such a security door system using electric field communication, since ID verification is not established even if a visitor who has a portable terminal in which regular ID information is not recorded stands on the electric field communication electrode in front of the door, security The door never opens and its security is high. Moreover, if a legitimate ID acquirer carries a portable terminal in which the ID information is recorded, he / she can open the door just by standing in front of the security door or open the door himself / herself. As with unmanaged automatic doors or manually opened / closed doors, there is an advantage that you can enter and exit without being particularly conscious of security.

  However, managers who monitor the entrance of unqualified people into their rooms not only prohibit the entry of suspicious people, but also discover good-willing visitors who cannot open the door in front of the security door. It is also necessary.

JP 2001-352298 A

  The present invention has been made in view of the above-mentioned problems of the prior art, and a non-portable person who does not carry an electric field communication terminal stands on the floor mat type electric field communication electrode device in front of the security door. It is an object of the present invention to provide an electric field communication system capable of detecting the presence of an electric field, and an electric field communication electrode device used therefor.

  According to the first aspect of the present invention, there is provided a floor mat type electrode for electric field communication having a signal electrode and a ground electrode opposed to the signal electrode, and the floor mat type electrode. The electrode device for electric field communication provided with the load sensor which detects the load added from the upper side is characterized.

  According to a second aspect of the present invention, in the electrode device for electric field communication according to the first aspect, the floor mat type electrode has flexibility to be deformed by an applied load.

  According to a third aspect of the invention, in the electrode device for electric field communication according to the first or second aspect, the load sensor is any one of a thin film resistance gauge type, a semiconductor strain gauge type, a piezoelectric type, an optical fiber type, and a capacitance type. It is characterized by being a pressure sensor.

  According to a fourth aspect of the present invention, in the electrode device for electric field communication according to the second aspect, the load sensor is a contact switch that operates by a load applied to the floor mat type electrode from above.

  Invention of Claim 5 is connected to the electrode device for electric field communication in any one of Claims 1-4, the signal electrode of the said floor mat type | mold electrode, and a ground electrode, The transmission / reception circuit which transmits / receives an electric field signal, The said load A load detection circuit that is connected to a sensor and determines whether or not a load is applied to an output signal of the load sensor; the transmission / reception circuit receives ID information; and the load detection circuit detects a load application. Terminal carrier / non-carrying person who decides that there is a terminal portable person at times, and when the transmission / reception circuit does not receive ID information and the load detection circuit detects the application of a load. An electric field communication system including a determination circuit is characterized.

  According to the electric field communication electrode device of the first aspect of the present invention, by installing this on the floor in front of the security door and connecting it to the transmission / reception device on the security door system side, the electric field communication portable terminal or portable terminal is provided. It can be determined that the load sensor detects that a suspicious person who is not carrying or a bona fide visitor is standing in front of the security door.

  According to the electrode device for electric field communication of the second aspect of the invention, the floor mat type electrode is made flexible so that the load of a visitor standing on the electrode device is made more sensitive to the load sensor. It can be felt.

  According to the electrode device for electric field communication of the invention of claim 3, by using any one of a pressure sensor of a thin film resistance gauge type, a semiconductor strain gauge type, a piezoelectric type, an optical fiber type, or a capacitance type. The load of a visitor standing on the electrode device can be sensitively sensed by the change in resistance value, the change in stress, the change in pressure, the change in optical signal, or the change in capacitance. it can.

  According to the electrode device for electric field communication of the invention of claim 4, a visitor standing on the electrode device can be obtained by using, as a load sensor, a contact switch that operates by a load applied to the floor mat type electrode from above. Can be detected by the operation of the contact switch.

  Further, according to the electric field communication system of the invention of claim 5, the electric field communication portable terminal is not carried by installing the electric field communication electrode device on the floor in front of the security door and connecting it to the transmission / reception circuit. It is possible to accurately determine that the suspicious person or the bona fide visitor is standing in front of the security door by the terminal carrier / non-carried person determination circuit, and output it as security information.

The block diagram of the electric field communication system of the 1st Embodiment of this invention. 7 is a flowchart of terminal carrier / non-carried person determination processing performed by the terminal non-carried determination circuit in the electric field communication system according to the embodiment. The circuit block diagram of the transmission / reception circuit which performs electric field communication in the electric field communication system of the said embodiment. The circuit block diagram of another example of the transmission / reception circuit which performs electric field communication in the electric field communication system of the said embodiment. It is the electric field communication system of the 2nd Embodiment of this invention, Comprising: The block diagram of the electric field communication system provided with the electrode apparatus for electric field communication which mounts the contact switch type sensor as a load sensor. The electric field communication system of the said embodiment WHEREIN: Explanatory drawing of the load detection operation | movement of the contact switch type load sensor mounted in the electrode apparatus for electric field communication. It is the electric field communication system of the 3rd Embodiment of this invention, Comprising: The block diagram of the electric field communication system provided with the electrode apparatus for electric field communication of another structure which mounts the contact switch type | mold sensor as a load sensor. It is the electric field communication system of the 4th Embodiment of this invention, Comprising: The block diagram of the electric field communication system provided with the electrode apparatus for electric field communication of the structure which combines a floor mat type | mold electrode and a load sensor. Explanatory drawing of load detection operation | movement of the load sensor of the electrode apparatus for electric field communication in the electric field communication system of the said embodiment. It is the electric field communication system of the 5th Embodiment of this invention, Comprising: The block diagram of the electric field communication system of another structure provided with the electrode apparatus for electric field communication of the structure used as a floor mat type | mold electrode and a load sensor.

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

<First Embodiment>
FIG. 1 shows an electric field communication system according to one embodiment of the present invention. This electric field communication system is used for a security system such as a security door or security gate that automatically identifies only qualified persons such as employees, members, and related persons who have been given IDs in advance and allows entry or passage. The electric field communication electrode device 1 is laid on the floor surface in front of the security door or security gate (hereinafter collectively referred to as security door), and the floor mat type electrode 11 of the electric field communication electrode device 1 is provided. A transmission / reception circuit 2 is connected, and the transmission / reception circuit 2 is connected to a computer 3 that performs overall control of the security system.

  The electrode device for electric field communication 1 has a configuration in which a pressure sensor 12 is installed as a load sensor on the lower surface side of the floor mat type electrode 11 described above. The floor mat type electrode 11 has a structure in which a signal electrode 14 is installed on the upper surface side of a flexible floor mat-shaped insulator 13 and a ground electrode 15 is installed on the lower surface side of the insulator 13. The pressure sensor 12 is a sensor that changes a signal output by applying a pressure such as a human load, such as a thin film resistance gauge, a semiconductor strain gauge, a piezoelectric sensor, an optical fiber sensor, or a capacitance sensor. 16 and 17 are provided. The entire surface of the floor mat type electrode 11 and the pressure sensor 12 disposed on the lower surface side thereof is covered with a flexible material 18 having rubber elasticity and integrated.

  The electric field communication electrode device 1 has a thickness reduced as much as possible so that it does not get in the way even when laid in front of the security door. Further, in order to reliably perform communication between the portable terminal 23 and the computer 3, that is, to improve the communication performance and to make the contact time between the floor mat type electrode 11 and the terminal portable person as long as possible, the floor mat type electrode 11 is enlarged. For example, it is about 1 tatami mat (however, it is not limited).

  The electrodes 16 and 17 of the pressure sensor 12 are connected to the load detection circuit 4. The load detection circuit 4 is connected to the terminal carrier / non-carrier determination circuit 5.

  Since the terminal carrier / non-carried person determination circuit 5 uses the software processing for the terminal non-mobile person determination function, the terminal carrier / non-carried person determination circuit 5 is included in the arithmetic processing function in the computer 3. However, it is shown as a separate circuit for explanation. The determination process of the terminal carrier / non-carried person by the terminal carrier / non-carried person determination circuit 5 is based on the determination processing flow of FIG. That is, the transmission / reception circuit 2 outputs all signals from the portable terminal 23 by electric field communication. If ID information is included therein, the ID information is also output. The load detection circuit 4 determines that a person has stood on the electrode device 1 and outputs a load detection signal if the pressure detection signal output from the pressure sensor 12 changes more than a predetermined signal. In the terminal carrier / non-carried person determination circuit 5, the terminal carrier is subjected to the following conditions depending on the presence / absence of ID information in the signals from the transmission / reception circuit 2 and the presence / absence of the load detection signal from the load detection circuit 4. / The non-carried person determination output is output to the computer 3.

  ・ With ID information and load detection signal → ID output.

  ・ There is no ID information and there is a load detection signal.

  -With ID information and no load detection signal-> No output (determination of false detection due to electric field interference).

  -No ID information and no load detection signal → No output.

  The transmission / reception circuit 2 uses an electric field signal detection technique, induces an electric field based on information to be transmitted in an electric field transmission medium, and transmits / receives information using the induced electric field. Any of the optical types can be adopted. For example, the transmission / reception circuit 2 has the configuration shown in FIG. 3, and includes a transmission unit 802 for transmitting data, a reception unit 803 for receiving data, and an I / O circuit 901. When the transmission / reception circuit 2 receives the transmission data from the computer 3 via the input / output (I / O) circuit 901, the transmission / reception circuit 2 supplies the transmission data to the signal electrode 14 via the transmission unit 802, and passes through the signal electrode 14. Then, an electric field is induced in the electric field transmission medium, and this electric field is transmitted to other parts of the electric field transmission medium. The transmission unit 802 includes a modulation circuit 804 for modulating transmission data with a carrier wave output from the oscillator 805 and an oscillator 805 for outputting a carrier wave. The transmission / reception circuit 2 in FIG. 3 detects the electric field induced and transmitted by the electric field transmission medium by the signal electrode 14, converts the electric field into reception data by the reception unit 803, and passes through the input / output circuit 901. Output to the computer 3. Based on the received signal and the correction circuit 806 for determining and correcting whether the H and L levels of the demodulated signal have been inverted, and the carrier wave reproduced by the carrier wave reproduction circuit 808. A demodulating circuit 807 for reproducing data and a carrier wave reproducing circuit 808 for extracting a carrier wave from the received signal are provided. The computer 3 outputs a transmission / reception switching signal to the transmission / reception circuit 2 for instructing switching between transmission and reception operations together with transmission data.

  The transmission / reception circuit 2 may have the configuration shown in FIG. When the transmission data from the computer 3 is received via the input / output (I / O) circuit 901, the transmission / reception circuit 2 shown in FIG. 4 supplies the transmission data to the signal electrode 14 via the transmission unit 902, and the signal An electric field is induced in the electric field transmission medium via the electrode 14, and this electric field is transmitted to other parts of the electric field transmission medium. In addition, the transmission / reception circuit 2 detects the electric field induced and transmitted by the electric field transmission medium by the signal electrode 14 and couples the electric field to the electric field detection unit 905 in the reception unit 910 to convert it into an electric signal. The electric signal is subjected to signal processing such as amplification and noise removal by the signal processing circuit 906, further subjected to waveform shaping by the waveform shaping circuit 907, and output to the computer 3 via the input / output circuit 901.

  The transmission / reception circuit 22 of the portable terminal 23 has the same configuration as the transmission / reception circuit 2 described above, and also has a signal electrode and a ground electrode (not shown).

  As described above, the signal electrode 14 in the floor mat type electrode 11 transmits an electric field based on information to be transmitted. That is, the signal electrode 14 induces an electric field of transmission data supplied from the transmission / reception circuit 2 in the electric field transmission medium and detects the electric field induced in the electric field transmission medium. The signal electrode 14 is disposed on the side in contact with an electric field transmission medium such as a human body. On the other hand, the ground electrode 15 in the floor mat type electrode 11 is disposed outside the electric field transmission medium so as not to contact the electric field transmission medium such as a human body, and is connected to a position serving as a reference potential of the transmission / reception circuit 2. As the reference potential of the transmission / reception circuit 2, for example, a minus power source or a plus power source can be used in addition to the signal ground.

  Next, the operation of the electric field communication system configured as described above will be described.

[For mobile phone users]
When the visitor 20 is a terminal portable person and stands on the floor mat type electric field communication electrode device 1 with the portable terminal 23 including the computer 21 and the transmission / reception circuit 22, the human body and the signal electrode 14 are placed on the electric field transmission medium. As described above, an electric field communication path is established between the transmission / reception circuit 22 on the portable terminal 23 side and the transmission / reception circuit 2 on the system side. Via this communication path, communication between the computer 21 of the portable terminal 23 and the computer 3 on the system side becomes possible. For example, authentication information such as a user ID is sent from the computer 21 of the portable terminal 23 to the computer 3 on the system side. At the same time, the ID information is also transmitted to the terminal carrier / non-portable person determination circuit 5.

  In the case of the present embodiment, the pressure sensor 12 senses the load of the qualified person 20 standing on the electrode device 1 for electric field communication, and sends a pressure-sensitive signal from the electrodes 16 and 17 to the load detection circuit according to the magnitude. 4 is output. When the load detection circuit 4 receives a pressure-sensitive signal at a certain level or higher, the load detection circuit 4 outputs the load detection signal to the terminal carrier / non-portable person determination circuit 5.

  The terminal carrier / non-carrier determination circuit 5 determines that the user is a terminal carrier if ID information is included in the signal from the transmission / reception circuit 2 and a load detection signal is received from the load detection circuit 4. The ID information is transmitted to the computer 3.

  In the computer 3, if ID information is received from the terminal carrier / non-carried person determination circuit 5, this ID information is collated with the registered ID information, and if the collation is established, a signal indicating that the security door can be unlocked is sent to the security door. Output to the control unit (not shown) and perform security door unlock processing such as automatically opening the security door or unlocking the security door to allow visitors to enter the security door . If the verification is not established, the same processing as in the case of terminal non-carried person determination is executed.

[For non-terminal users]
When the visitor is a terminal non-portable person who does not carry the portable terminal 23 for electric field communication, electric field communication is started even if the terminal non-portable person stands on the floor mat type electric field communication electrode device 1. There is nothing. However, the pressure sensor 12 responds to the load of the non-portable person standing on the electric field communication electrode device 1 and outputs a pressure-sensitive signal corresponding to the magnitude of the load to the load detection circuit 4 at the electrodes 16 and 17. To do. When the load detection circuit 4 receives a pressure-sensitive signal of a certain level or higher, the load detection circuit 4 outputs the load detection signal to the terminal carrier / non-portable person determination circuit 5. Since the terminal carrier / non-carried person determination circuit 5 receives the load detection signal from the load detection circuit 4 and does not receive the ID information from the transmission / reception circuit 2, the terminal carrier / non-carried person determination circuit 5 determines that it is a terminal non-carrier. A determination result indicating that the user is a terminal non-portable person is transmitted to the computer 3.

  When the computer 3 receives the terminal non-carried person determination signal from the terminal carrier / non-carried person determination circuit 5, the computer 3 starts control corresponding thereto. For example, the video of the surveillance camera installed in the security zone is captured and displayed on the monitor and video recording is started. The speaker in the security zone “If you have a customer, call the extension number ***. An automatic announcement such as “Please call me” can be output. In addition, the response | compatibility process at the time of determining a terminal non-carried person is not limited to this.

  Thus, according to the electric field communication system of the present embodiment, a visitor 20 carrying a portable terminal 23 in which regular ID information for electric field communication is registered is provided with a security door by electric field communication. Can be unlocked, and if a visitor who does not carry a mobile device stands in front of the security door, it can detect a visitor who does not have a mobile device, and can take the necessary action set in advance. It is possible to prevent the occurrence of a situation where the terminal is left standing in front of the security door without giving any information when the terminal non-portable person visits. The behavior of suspicious persons can also be monitored.

<Second Embodiment>
As shown in FIG. 5, the electric field communication system according to the second embodiment of the present invention is characterized in that a contact switch type sensor 12A is used as a load sensor in the electric field communication electrode device 1A. Since the other components are common to the first embodiment, the common components will be described using the same reference numerals.

  In the electric field communication system of the present embodiment, the electric field communication electrode device 1 has a contact switch type sensor 12A on the lower surface side of a floor mat type electrode 11 having the same configuration as that of the first embodiment and capable of being elastically deformed flexibly. It is installed and its entire surface is covered with a flexible surface material 18. The contact switch type sensor 12A interposes a spacer 123 having a lattice-like or flat columnar body or cylinder distributed between planar contact points 121, 122 that can be elastically deformed flexibly, and the spacer 123 does not exist. In this structure, the gaps 124 are distributed over the entire surface. Further, on the lower surface side of the contact switch type sensor 12A, the actuator 125 is arranged so as to correspond to the position of the gap 124, and the gap 126 for deforming the spacer 123 downward is formed. It is.

  In the contact switch type sensor 12A as the load sensor, the actuator 125 below each gap portion 124 is the load detection point A in the no-load state shown in FIG. Then, as shown in FIG. 6B, a person stands on the floor mat type electrode 11 of the electric field communication electrode device 1A, and the load application portion of the floor mat type electrode 11 is the lower gap portion 126 by the load. When deforming inward, the upper planar contact 121 and the lower planar contact 122 come into contact with each other at the actuator 125, and the upper and lower planar contacts 121, 122 are in electrical conduction. Thus, when the contact ON signal is output from the contact switch type sensor 12A, the load detection circuit 4 detects the load application and outputs a load detection signal to the terminal carrier / non-carrier determination circuit 5. When the load is no longer applied and the state returns to the state shown in FIG. Output.

  The terminal carrier / non-carried person determination process by the terminal carrier / non-carried person determination circuit 5 is the same as that in the first embodiment, and is shown in FIG.

  Also in the present embodiment, as in the first embodiment, a security door is provided by electric field communication for a visitor carrying a portable terminal 23 in which regular ID information for electric field communication is registered. Can be unlocked, and if a visitor who does not carry a mobile device stands in front of the security door, it can detect a visitor who does not have a mobile device, and can take the necessary action set in advance. It is possible to prevent the occurrence of a situation where the terminal is left standing in front of the security door without giving any information when the terminal non-portable person visits, and the behavior of the suspicious person can be monitored.

<Third Embodiment>
As shown in FIG. 7, the electric field communication system according to the third embodiment of the present invention uses a contact switch type sensor 12B as a load sensor in the electric field communication electrode device 1B, and the ground electrode of the floor mat type electrode 11 15 is combined with the planar contact 121 on the upper side of the contact switch type sensor 12B. Since other components are common to the first and second embodiments, the common components will be described using the same reference numerals.

  Also in the contact switch type sensor 12B as the load sensor, the actuator 125 below each gap portion 124 becomes the load detection point A in the no-load state as shown in FIG. ing. 6B, a person stands on the floor mat type electrode 11 of the electrode device for electric field communication 1B, and the load application portion of the floor mat type electrode 11 is on the lower side by the load. When the space portion 126 is deformed, the upper planar contact 121 and the lower planar contact 122 come into contact with each other at the actuator 125, and the upper and lower planar contacts 121, 122 are in electrical conduction. . Thus, when the ON signal is output from the contact switch type sensor 12B, the load detection circuit 4 detects the load application and outputs a load detection signal to the terminal carrier / non-carrier determination circuit 5. When the load is no longer applied and the state returns to the state shown in FIG. 6A, the on-output of the contact switch type sensor 12B stops, and the load detection circuit 4 detects the loss of the load and determines the terminal carrier / non-carrier The output of the load detection signal to the circuit 5 is stopped.

  The terminal carrier / non-carried person determination process by the terminal carrier / non-carried person determination circuit 5 is the same as that in the first embodiment, and is shown in FIG.

  Also in the present embodiment, as in the first embodiment, a security door is provided by electric field communication for a visitor carrying a portable terminal 23 in which regular ID information for electric field communication is registered. Can be unlocked, and if a visitor who does not carry a mobile device stands in front of the security door, it can detect a visitor who does not have a mobile device, and can take the necessary action set in advance. It is possible to prevent the occurrence of a situation where the terminal is left standing in front of the security door without giving any information when the terminal non-portable person visits, and the behavior of the suspicious person can be monitored.

  In addition, in the case of the present embodiment, the ground electrode 15 of the floor mat type electrode 11 is also used as the planar contact 121 on the upper side of the contact switch type sensor 12B in the electric field communication electrode device 1B. The manufacturing cost of the electrode device 1B can be reduced as compared with the electrode device 1A of the embodiment.

<Fourth embodiment>
As shown in FIG. 8, the electric field communication system according to the fourth embodiment of the present invention is characterized by the electric field communication electrode device 1C, and uses both the floor mat type electrode 11A and the pressure sensor 12C as a load sensor. It has a configuration. The floor mat type electrode 11A is a flexible elastic material having an electrostatic capacity, and a signal electrode 14 is provided on the upper surface side of the insulating material 13A and a ground electrode 15 is provided on the lower surface side. It is the structure covered. The floor mat type electrode 11A also operates as a capacitance type pressure sensor 12C. Therefore, the signal electrode 14 also operates as the sensor electrode 16, and the ground electrode 15 also operates as the sensor electrode 17.

  For the electric field communication electrode device 1C, the switching circuit 6 is connected to the output lines of the signal electrode 14 and the ground electrode 15, the transmission / reception circuit 2 is connected to one of the two outputs of the switching circuit 6, and the other A capacitance detection circuit is connected as the load detection circuit 4A. The terminal carrier / non-carried person determination circuit 5 and the computer 3 are connected to the transmission / reception circuit 2 and the load detection circuit 4A, as in the first to third embodiments. The switching circuit 6 performs an operation of switching the connection destination from the transmission / reception circuit 2 to the load detection circuit 4A for a fixed time every fixed time, for example, for 100 ms every second. The load detection circuit 4A measures the electrostatic capacitance between the signal electrode 14 and the ground electrode 15 of the electrode device for electric field communication 1C, and changes from a normal value (capacitance value at no load) to a predetermined value or more. The load is sometimes detected, and a load detection signal is output to the terminal carrier / non-portable person determination circuit 5. The terminal carrier / non-carried person determination circuit 5 determines the terminal according to the condition determination of FIG. 2 in the same manner as in the first embodiment, based on the presence / absence of the ID information from the transmission / reception circuit 2 and the load detection signal from the load detection circuit 4A. A portable person and a terminal non-carrying person are determined and output to the computer 3.

  The principle that the floor mat type electrode 11A of the electrode device for electric field communication 1C detects a load as the capacitance type pressure sensor 12C is as follows. As shown in FIG. 9A, the pressure sensor 12 is not deformed in a no-load state, and is the distance d1 between the electrodes 14 and 15. When a person stands on the electrode device for electric field communication 1C and a load L is applied, the pressure sensor 12C is deformed by the load L, and the distance d2 between the electrodes 14 and 15 is narrowed. The capacitance increases. Therefore, the load detection circuit 4A measures the electrostatic capacitance between the signal electrode 14 and the ground electrode 15 of the electrode device for electric field communication 1C, and a change of a predetermined value or more from a normal value (capacitance value when no load is applied). When there is a load, the load is detected, and a load detection signal is output to the terminal carrier / non-portable person determination circuit 5.

  Next, the operation of the electric field communication system configured as described above will be described.

[For mobile phone users]
As in the first embodiment, as shown in FIG. 1, the visitor 20 is a terminal portable person, carrying a portable terminal 23 including a computer 21 and a transmission / reception circuit 22, and for floor mat type electric field communication. When standing on the electrode device 1C, an electric field communication path is established between the transmission / reception circuit 22 on the portable terminal 23 side and the transmission / reception circuit 2 on the system side using the human body and the signal electrode 14 as an electric field transmission medium. Via this communication path, communication between the computer 21 of the portable terminal 23 and the computer 3 on the system side becomes possible. For example, authentication information such as a user ID is sent from the computer 21 of the portable terminal 23 to the computer 3 on the system side. At the same time, the ID information is also transmitted to the terminal carrier / non-portable person determination circuit 5.

  In the case of the present embodiment, when the switching circuit 6 switches the connection destination to the load detection circuit 4A side, the floor mat type electrode 11A becomes the pressure sensor 12C, and the electrodes 14 and 15 connect to the load detection circuit 4A side. On the load detection circuit 4A side, the capacitance between the electrodes 14 and 15 is measured to determine a change from the normal value. In the present case, since the visitor 20 stands on the floor mat type electrode 11C, the load L is applied and the deformation occurs, the distance between the electrodes 14 and 15 is reduced, and the capacitance is increased. Therefore, the load detection circuit 4 </ b> A determines that there is a load, and outputs a load detection signal to the terminal carrier / non-carrier determination circuit 5.

  Similarly to the first embodiment, the terminal carrier / non-carrier judging circuit 5 receives the ID information from the transmission / reception circuit 2 and receives the load detection signal from the load detection circuit 4A. It is determined that the terminal carrier is standing on the top, and the ID information is transmitted to the computer 3.

  In the computer 3, if ID information is received from the terminal carrier / non-carried person determination circuit 5, this ID information is collated with the registered ID information, and if the collation is established, a signal indicating that the security door can be unlocked is sent to the security door. Output to the control unit (not shown) and perform security door unlock processing such as automatically opening the security door or unlocking the security door to allow visitors to enter the security door .

[For non-terminal users]
When a visitor is a terminal non-portable person who does not carry the portable terminal 23 for electric field communication, electric field communication is started even when the terminal non-portable person stands on the floor mat type electric field communication electrode device 1C. There is nothing. However, during the period when the electrodes 14 and 15 of the floor mat type electrode 11A are connected to the load detection circuit 4A side in the switching circuit 6, the capacitance pressure sensor 12C operates and the electric field communication electrode device 1C is operated. The capacitance between the electrodes 14 and 15 is increased by the load L of the person who does not carry the terminal. Therefore, the load detection circuit 4 </ b> A determines that there is a load due to an increase in capacitance, and outputs a load detection signal to the terminal carrier / non-portable person determination circuit 5.

  Even if the terminal carrier / non-carried person determination circuit 5 receives the load detection signal from the load detection circuit 4, it does not receive the ID information from the transmission / reception circuit 2. A determination result indicating that the user is a terminal non-portable person is transmitted to 3.

  When the computer 3 receives the terminal non-carried person determination signal from the terminal carrier / non-carried person determination circuit 5, the computer 3 starts the same control as in the first embodiment. For example, the video of the surveillance camera installed in the security zone is captured and displayed on the monitor and video recording is started. The speaker in the security zone “If you have a customer, call the extension number ***. For example, an automatic announcement such as “Please call us” is output.

  As described above, even with the electric field communication system of the present embodiment, the visitor 20 carrying the portable terminal 23 in which the regular ID information for electric field communication is registered is protected by the electric field communication. It can be unlocked, and if a visitor who does not carry a mobile device stands in front of the security door, it can detect the visit of a non-terminal user and take the necessary action set in advance. It is possible to prevent the occurrence of a situation in which a non-portable person is left standing in front of the security door without giving any information. The behavior of suspicious persons can also be monitored.

  In addition, in the case of the present embodiment, the electric field communication electrode device 1C combines the floor mat type electrode 11A and the pressure sensor 12C as one element, so that the manufacturing cost of the electrode device 1C can be reduced. .

<Fifth embodiment>
The electric field communication system of the 5th Embodiment of this invention is demonstrated using FIG. The present embodiment uses an electric field communication electrode device 1C common to the fourth embodiment, but the configuration of the signal output processing circuit is different from that of the fourth embodiment. Although the switching circuit 6 is adopted in the fourth embodiment of FIG. 8, the switching circuit is omitted in this embodiment, and the transmission / reception circuit 2 is connected to the output lines of the signal electrode 14 and the ground electrode 15 in the floor mat type electrode 11A. A load detection circuit 4B based on capacitance measurement is connected in parallel.

  The load detection circuit 4B is activated for a certain period of time, for example, 100 ms every second, and measures the capacitance. Then, the electrostatic capacitance between the signal electrode 14 and the ground electrode 15 is measured, the load is detected when there is a change of a predetermined value or more from the normal value (capacitance value when there is no load), and the load detection signal is transmitted to the terminal carrier. / Output to non-carried person determination circuit 5. The terminal carrier / non-carried person determination circuit 5 determines the terminal according to the condition determination of FIG. 2 in the same manner as in the first embodiment based on the presence / absence of the ID information from the transmission / reception circuit 2 and the load detection signal from the load detection circuit 4B. A portable person and a terminal non-carrying person are determined and output to the computer 3.

  Next, the operation of the electric field communication system configured as described above will be described.

[For mobile phone users]
As in the first embodiment, as shown in FIG. 1, the visitor 20 is a terminal portable person, carrying a portable terminal 23 including a computer 21 and a transmission / reception circuit 22, and for floor mat type electric field communication. When standing on the electrode device 1C, communication is possible between the computer 21 of the portable terminal 23 and the computer 3 on the system side, and authentication information such as a user ID is transmitted from the computer 21 of the portable terminal 23 to the computer 3 on the system side. At the same time, the ID information is also transmitted to the terminal carrier / non-carrier determination circuit 5.

  In the case of the present embodiment, the load detection circuit 4B uses the floor mat type electrode 11A as the capacitance type pressure sensor 12C and the electrostatic capacitance between the electrodes 14 and 15 while the load detection circuit 4B is activated every predetermined time. Measure capacity and determine change from normal value. In the present case, since the visitor 20 is standing on the floor mat type electrode 11A, the load is applied and deformed, the distance between the electrodes 14 and 15 is reduced, and the capacitance is increased. Therefore, the load detection circuit 4B determines that there is a load, and outputs a load detection signal to the terminal carrier / non-carrier determination circuit 5.

  Similarly to the first embodiment, the terminal carrier / non-carrier determining circuit 5 receives the ID information from the transmission / reception circuit 2 and receives the load detection signal from the load detection circuit 4B. It is determined that the terminal carrier is standing on the computer, and ID information is transmitted to the computer 3.

  In the computer 3, if ID information is received from the terminal carrier / non-carried person determination circuit 5, this ID information is collated with the registered ID information, and if the collation is established, a signal indicating that the security door can be unlocked is sent to the security door. Output to the control unit (not shown) and perform security door unlock processing such as automatically opening the security door or unlocking the security door to allow visitors to enter the security door .

[For non-terminal users]
When the visitor is a terminal non-portable person who does not carry the portable terminal 23 for electric field communication, electric field communication is started even when the terminal non-portable person stands on the floor mat type electric field communication electrode device 1C. There is nothing. However, during the period when the load detection circuit 4B is activated, the floor mat type electrode 11A operates as the capacitance type pressure sensor 12C, and is caused by the load of the terminal non-carried person standing on the electric field communication electrode device 1C. Since the capacitance between the electrodes 14 and 15 increases, the load detection circuit 4B determines that there is a load due to the increase in capacitance, and outputs a load detection signal to the terminal carrier / non-portable person determination circuit 5. .

  Even if the terminal carrier / non-carrier determination circuit 5 receives the load detection signal from the load detection circuit 4B, it does not receive the ID information from the transmission / reception circuit 2, and therefore determines that the terminal carrier / non-carrier determination terminal 5 is a terminal non-carrier. A determination result indicating that the user is a terminal non-portable person is transmitted to 3.

  When the computer 3 receives the terminal non-carried person determination signal from the terminal carrier / non-carried person determination circuit 5, the computer 3 starts the same control as in the first embodiment. For example, the video of the surveillance camera installed in the security zone is captured and displayed on the monitor and video recording is started. The speaker in the security zone “If you have a customer, call the extension number ***. For example, an automatic announcement such as “Please call us” is output.

  As described above, even with the electric field communication system of the present embodiment, the visitor 20 carrying the portable terminal 23 in which the regular ID information for electric field communication is registered is protected by the electric field communication. It can be unlocked, and if a visitor who does not carry a mobile device stands in front of the security door, it can detect the visit of a non-terminal user and take the necessary action set in advance. It is possible to prevent the occurrence of a situation such as leaving a person standing in front of the security door without giving any information when a non-portable person visits, and monitoring a suspicious person.

  In addition, in the case of the present embodiment, the electric field communication electrode device 1C combines the floor mat type electrode 11A and the pressure sensor 12C as one element, so that the manufacturing cost of the electrode device 1C can be reduced. At the same time, since the switching circuit 6 is not used, the cost can be reduced.

  While the embodiments of the present invention have been described above, various modifications and changes can be made to the embodiments of the present invention without departing from the scope of the present invention.

1, 1A, 1B, 1C Electric field communication electrode device 2 Transmitter / receiver circuit 3 Computer 4, 4A, 4B Load detection circuit 5 Terminal carrier / non-carrier determination circuit 6 Switching circuit 11, 11A Floor mat type electrode 12, 12C Pressure sensor 12A, 12B Contact switch type sensor 13, 13A Insulating material 14 Signal electrode 15 Ground electrode 16 Sensor electrode 17 Sensor electrode 18 Surface material 20 Visitor 21 Computer 22 Transmission / reception circuit 23 Portable terminal 121 Sensor electrode 122 Sensor electrode 123 Spacer 124 Gap 125 Base plate

Claims (5)

A floor mat type electrode for electric field communication having a signal electrode and a ground electrode facing the signal electrode in the vicinity thereof;
An electrode device for electric field communication, comprising: a load sensor that is installed below the floor mat type electrode and detects a load applied to the floor mat type electrode from above.   2. The electrode device for electric field communication according to claim 1, wherein the floor mat type electrode has flexibility to be elastically deformed by an applied load.   3. The electric field communication according to claim 1, wherein the load sensor is a pressure sensor of any one of a thin film resistance gauge type, a semiconductor strain gauge type, a piezoelectric type, an optical fiber type, and a capacitance type. Electrode device.   The electrode device for electric field communication according to claim 2, wherein the load sensor is a contact switch that operates by a load applied to the floor mat type electrode from above. The electrode device for electric field communication according to any one of claims 1 to 4,
A transmission / reception circuit connected to the signal electrode and the ground electrode of the floor mat type electrode, for transmitting and receiving an electric field signal;
A load detection circuit that is connected to the load sensor and determines whether or not a load is applied to an output signal of the load sensor;
When the transmission / reception circuit receives ID information and the load detection circuit detects application of load, it is determined that there is a terminal carrier, the transmission / reception circuit does not receive ID information, and the load detection circuit An electric field communication system comprising: a terminal carrier / non-carried person determination circuit that determines that there is a terminal non-carried person when detecting a load application.

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