JP2006207199A - Operation control device, communication terminal, and electronic key system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an operation control device capable of enhancing a security level, a communication terminal, and an electronic key system. <P>SOLUTION: When a request signal, which is transmitted from a door unlocking control device 3 by cable communications (in-human-body communications) via an electrode 32 for transmission, is received by a portable machine 2 via an electrode 22 for reception, an ID code signal is transmitted from the portable machine 2 by radio communications. When an ID code, which is included in the ID code signal received by the control device 3, corresponds to a reference ID code, the unlocking of an in-vehicle door is permitted. In other words, the electronic key system 1 makes the request signal from the control device 3 transmitted not by the radio communications but by the cable communications (in-human-body communications). This prevents a third person from performing the tapping of the request signal. Thus, the security level can be enhanced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention includes an operation control device used in an electronic key system that permits an operation of a controlled object by an operation control device when a corresponding communication terminal is used, the communication terminal, and the operation control device and the communication terminal. The electronic key system.

  In recent years, there has been proposed an electronic key system that permits an operation of a controlled object by an operation control device when a corresponding communication terminal (electronic key) is used. In Patent Document 1, when the holder of the corresponding electronic key (portable device) enters a predetermined area outside the vehicle, the operation control device (transmission / reception device on the vehicle side) automatically permits the unlocking of the vehicle-mounted door. An electronic key system (vehicle remote control device) is disclosed. When the door outside handle is touched in a state where unlocking of the in-vehicle door is permitted, the in-vehicle door is unlocked.

  In this type of electronic key system, in order to monitor the approach of the corresponding electronic key holder to the vehicle, a request signal is transmitted from the operation control device to a predetermined area outside the vehicle while the in-vehicle door is locked. When the request signal is received by the electronic key, a signal (ID code signal) including an ID code individually set for each electronic key is transmitted from the electronic key. When the ID code signal is received by the operation control device, the operation control device determines whether or not the ID code included in the ID code signal matches the reference ID code. When the two ID codes match, the operation control device recognizes that the corresponding electronic key has been used and permits the unlocking of the vehicle-mounted door.

Therefore, according to the electronic key system, the holder of the electronic key does not need to perform a complicated operation using the mechanical key when getting on. Therefore, the electronic key system is excellent in convenience. Moreover, according to the electronic key system, the unlocking of the vehicle-mounted door is not permitted unless an electronic key that is much more difficult to duplicate than a mechanical key is used. Therefore, the electronic key system has a high security level.
Japanese Patent Laid-Open No. 2002-029385 (paragraph numbers 0002 to 0007)

  By the way, it is conceivable that a request signal transmitted from the operation control device is wiretapped by a third party. In short, even with the conventional electronic key system, a sufficiently high security level is ensured, but further improvement of the security level is required.

  The present invention has been made paying attention to such problems, and an object thereof is to provide an operation control device, a communication terminal, and an electronic key system capable of improving the security level. .

  In order to achieve the above object, according to the first aspect of the present invention, there is provided an electronic key system that permits an operation of a controlled object by an operation control device when a corresponding communication terminal is used. First transmission means for transmitting a request signal that is a trigger signal for establishing bidirectional communication with the communication terminal, and wireless communication from the communication terminal in response to the request signal transmitted from the first transmission means When the ID code included in the ID code signal received by the first receiving means matches the reference ID code, the corresponding communication terminal receives the ID code signal transmitted by the first receiving means. And a control means for recognizing that the control object is used and permitting the operation of the control target. The first transmission means transmits a request signal by wired communication. Characterized in that it is a shall.

  According to a second aspect of the present invention, in the operation control apparatus according to the first aspect, the first transmission means transmits the request signal by wired communication and by human body communication using the human body as a signal transmission path. It is characterized by that.

  According to a third aspect of the present invention, in the operation control device according to the second aspect, the first transmission means includes a transmission electrode serving as a medium for transmitting a request signal by in-vivo communication. To do.

  In the invention described in claim 4, the electronic key system is provided for permitting the operation of the object to be controlled by the operation control device when the corresponding communication terminal is used, and bidirectional between the operation control device and the communication terminal. A second receiving means for receiving a request signal that is a trigger signal for establishing communication, and an individual setting for each communication terminal to respond to the request signal when the request signal is received by the second receiving means. In a communication terminal comprising: a generating unit that generates an ID code signal that is a signal including the generated ID code; and a second transmitting unit that transmits the ID code signal generated by the generating unit by wireless communication. The receiving means is characterized in that it receives a request signal transmitted from the operation control device by wired communication.

  According to a fifth aspect of the present invention, in the communication terminal according to the fourth aspect, the second receiving means transmits a request transmitted by in-vivo communication using the human body as a signal transmission path as wired communication from the operation control device. It is characterized by receiving a signal.

  According to a sixth aspect of the present invention, in the communication terminal according to the fifth aspect, the second receiving means is a receiving medium serving as a medium for receiving a request signal transmitted from the operation control device through in-vivo communication. An electrode is included.

According to a seventh aspect of the invention, the operation control device according to the first aspect and the communication terminal according to the fourth aspect are provided.
The invention according to claim 8 is characterized by comprising the operation control device according to claim 2 and the communication terminal according to claim 5.

The invention according to claim 9 is characterized by comprising the operation control device according to claim 3 and the communication terminal according to claim 6.
The “action” of the present invention will be described below.

  When the request signal transmitted from the operation control device according to the first aspect of the invention by wire communication is received by the communication terminal according to the fourth aspect of the invention, the ID code signal is transmitted from the communication terminal by wireless communication. Sent. When the ID code included in the ID code signal received by the operation control device matches the reference ID code, the operation of the controlled object is permitted. In other words, according to the electronic key system of the seventh aspect of the invention, the request signal is transmitted from the operation control device by wired communication instead of wireless communication. For this reason, the request signal is not wiretapped by a third party. Therefore, the security level can be improved.

  When the request signal transmitted from the operation control apparatus according to the invention according to claim 2 by the in-body communication as wired communication is received by the communication terminal according to the invention according to claim 5, the ID code signal is transmitted from the communication terminal. Is transmitted by wireless communication. When the ID code included in the ID code signal received by the operation control device matches the reference ID code, the operation of the controlled object is permitted. That is, according to the electronic key system of the eighth aspect of the invention, the request signal is transmitted from the operation control device by wired communication instead of wireless communication by human body communication. For this reason, the request signal is not wiretapped by a third party. Therefore, the security level can be improved.

  A request signal transmitted from the operation control device according to the third aspect of the invention by in-vivo communication via the transmission electrode is received by the communication terminal according to the sixth aspect of the invention via the reception electrode. The ID code signal is transmitted from the communication terminal by wireless communication. When the ID code included in the ID code signal received by the operation control device matches the reference ID code, the operation of the controlled object is permitted. That is, with the electronic key system according to the ninth aspect of the present invention, the request signal is transmitted from the operation control device by wired communication instead of wireless communication by human body communication. For this reason, the request signal is not wiretapped by a third party. Therefore, the security level can be improved.

Since this invention is comprised as mentioned above, there exist the following effects.
According to the invention of any one of claims 1 to 9, the security level can be improved.

Hereinafter, an embodiment in which the present invention is embodied in an electronic key system of an automobile will be described.
As shown in FIG. 1, the electronic key system 1 includes a portable device 2 and a door unlock control device 3. The portable device 2 is owned by the owner of the automobile. In this embodiment, the portable device 2 has a wristwatch type. That is, the portable device 2 is directly attached to the arm so as to surround the arm of the owner of the automobile. Therefore, when the portable device 2 is attached to the arm, the back surface of the portable device 2 is in close contact with the arm. On the other hand, the door unlock control device 3 is provided on the automobile side. The electronic key system 1 can perform bidirectional communication between the portable device 2 and the door unlock control device 3. The electronic key system 1 permits the door unlock control device 3 to unlock the vehicle-mounted door when the corresponding portable device 2 is used.

  The portable device 2 has a reception function by wired communication and a transmission function by wireless communication. In the present embodiment, the portable device 2 has a reception function by in-body communication using a human body as a signal transmission path as wired communication. The portable device 2 includes a reference potential electrode 21, a reception electrode 22, a reception circuit 23, a microcomputer 24, a transmission circuit 25, a transmission antenna 26, an unlock switch 27, and a lock switch 28.

  The reference potential electrode 21 is exposed on the back surface of the portable device 2. The reference potential electrode 21 is grounded via the human body when the portable device 2 is worn on the arm. The receiving electrode 22 is exposed on the back surface of the portable device 2. The receiving electrode 22 is a medium for receiving a request signal transmitted from the door unlock control device 3 through in-vivo communication. The reception electrode 22 functions as a medium for receiving a request signal when a person wearing the portable device 2 touches the door outside handle 4 provided on the vehicle-mounted door. Needless to say, the door outside handle 4 is operated to open the vehicle-mounted door from the outside of the vehicle.

  The receiving circuit 23 is for receiving a request signal transmitted from the door unlock control device 3. In the present embodiment, when the person wearing the portable device 2 touches the door outside handle 4, the receiving circuit 23 receives the request signal via the human body of the person wearing the portable device 2 and the receiving electrode 22. When receiving the request signal, the reception circuit 23 generates a reception signal. Then, the reception circuit 23 outputs a reception signal to the microcomputer 24.

  The microcomputer 24 is a CPU unit including a CPU, ROM, RAM, and the like (not shown). The microcomputer 24 includes a nonvolatile memory 24a. The memory 24a stores an ID code (ID code of the portable device 2) set individually for each portable device 2. When the reception signal is input from the reception circuit 23, the microcomputer 24 generates a signal (ID code signal) including the ID code of the portable device 2 in order to respond to the request signal. Then, the microcomputer 24 outputs an ID code signal to the transmission circuit 25.

  The transmission circuit 25 modulates the ID code signal input from the microcomputer 24 into a radio wave having a predetermined frequency (300 MHz in this embodiment). The transmission antenna 26 is a medium for transmitting the ID code signal modulated by the transmission circuit 25 to the outside by wireless communication.

  The unlock switch 27 is operated when the vehicle door is unlocked by remote control from a point away from the vehicle. The unlock switch 27 is a push switch provided with a button that can be pressed from the outside of the portable device 2. When the button is pressed, the unlock switch 27 outputs to the microcomputer 24 a detection signal indicating that an operation for unlocking the in-vehicle door has been performed.

  When a detection signal is input from the unlock switch 27, the microcomputer 24 requests an unlocking of the in-vehicle door to request the unlocking of the in-vehicle door (unlock requesting operation code) and a mobile phone. A signal including the ID code of the machine 2 (an ID code signal for unlock request) is generated. Then, the microcomputer 24 outputs the unlock request ID code signal to the transmission circuit 25.

  The transmission circuit 25 modulates the unlock request ID code signal input from the microcomputer 24 into a radio wave having a predetermined frequency (300 MHz in the present embodiment). The transmission antenna 26 also functions as a medium for transmitting the unlock request ID code signal modulated by the transmission circuit 25 to the outside by wireless communication.

  The lock switch 28 is operated when the vehicle-mounted door is locked by remote control from a point away from the automobile. The lock switch 28 is a push switch having a button that can be pressed from the outside of the portable device 2. When the button is pressed, the lock switch 28 outputs to the microcomputer 24 a detection signal indicating that an operation for locking the vehicle-mounted door has been performed.

  When the detection signal is input from the lock switch 28, the microcomputer 24 requests an operation code (lock request operation code) for requesting the lock of the in-vehicle door and the ID of the portable device 2 to request the lock of the in-vehicle door. A signal including a code (ID code signal for lock request) is generated. Then, the microcomputer 24 outputs the lock request ID code signal to the transmission circuit 25.

  The transmission circuit 25 modulates the lock request ID code signal input from the microcomputer 24 into a radio wave having a predetermined frequency (300 MHz in this embodiment). The transmission antenna 26 also functions as a medium for transmitting the lock request ID code signal modulated by the transmission circuit 25 to the outside by wireless communication.

  The door unlock control device 3 has a transmission function by wired communication and a reception function by wireless communication. In the present embodiment, the door unlock control device 3 has a transmission function by in-body communication using a human body as a signal transmission path as wired communication. The door unlock control device 3 includes a transmission circuit 31, a transmission electrode 32, a reception antenna 33, a reception circuit 34, and a verification electronic control unit (hereinafter referred to as a verification ECU) 35.

  The transmission circuit 31 is for transmitting a request signal input from the verification ECU 35. In the present embodiment, the transmission circuit 31 transmits a request signal via the transmission electrode 32 and the passenger's human body when the passenger touches the door outside handle 4.

  The transmitting electrode 32 is exposed on the surface of the door outside handle 4. The transmission electrode 32 is a medium for transmitting a request signal to the outside by in-vivo communication. The transmission electrode 32 functions as a medium for transmitting a request signal when the passenger touches the door outside handle 4. The request signal is a trigger signal for establishing bidirectional communication between the portable device 2 and the door unlock control device 3.

  The receiving antenna 33 is a medium for receiving an ID code signal transmitted from the portable device 2 by wireless communication in response to the request signal. When an ID code signal is received by the receiving antenna 33, the receiving circuit 34 demodulates the ID code signal to generate a received signal. Then, the reception circuit 34 outputs a reception signal to the verification ECU 35.

  The verification ECU 35 is a CPU unit including a CPU, a ROM, a RAM, and the like (not shown). The verification ECU 35 includes a non-volatile memory 35a. The memory 35a stores the same ID code (reference ID code) as the ID code of the corresponding portable device 2.

  Here, the verification ECU 35 outputs a request signal to the transmission circuit 31 when the passenger touches the door outside handle 4. Then, a request signal is transmitted from the transmission circuit 31 via the transmission electrode 32 and the human body of the passenger. When the ID code signal transmitted from the portable device 2 by wireless communication in response to the request signal is received by the receiving antenna 33, the received signal (including the ID code of the portable device 2) is received from the receiving circuit 34 to the verification ECU 35. ) Is entered.

  When the reception signal is input from the reception circuit 34, the verification ECU 35 determines whether or not the ID code included in the reception signal matches the reference ID code. That is, in this case, the verification ECU 35 performs ID code verification.

  A door electronic control unit (hereinafter referred to as a door ECU) 40 is electrically connected to the verification ECU 35. When both ID codes match by ID code verification, the verification ECU 35 recognizes that the corresponding portable device 2 has been used and outputs a door unlock permission signal to the door ECU 40.

  The door ECU 40 unlocks the in-vehicle door. When the door unlock permission signal is input from the verification ECU 35, the door ECU 40 controls the door lock motor 50 to unlock the vehicle-mounted door.

The door lock motor 50 is a DC motor capable of forward rotation and reverse rotation.
As described above, the electronic key system 1 according to this embodiment is configured such that when a person wearing the corresponding portable device 2 (regular portable device 2) touches the door outside handle 4, the door unlock control device 3 controls the in-vehicle door. It has a function of automatically permitting unlocking (door unlocking automatic permitting function). In order to validate the door unlock automatic permission function, it is necessary to register the portable device 2 (ID code of the portable device 2) in the door unlock control device 3 (memory 35a of the verification ECU 35) in advance. . However, since the registration procedure is not the main part of the present invention, the description is omitted.

  By the way, when the unlock switch 27 of the portable device 2 is operated, an ID code signal for unlock request is transmitted from the portable device 2 by wireless communication. When the unlock requesting ID code signal is received by the receiving antenna 33, the receiving signal (including the unlocking request operation code and the portable device 2 ID code) is input from the receiving circuit 34 to the verification ECU 35. .

  When the received signal input from the receiving circuit 34 includes an ID code that matches the reference ID code, and the received signal includes an unlock request operation code, the verification ECU 35 2 is used to recognize that an operation for unlocking the vehicle-mounted door has been performed, and a door unlock permission signal is output to the door ECU 40. As a result, the door lock motor 50 is driven and controlled by the door ECU 40, and the vehicle-mounted door is unlocked.

  As described above, the electronic key system 1 of the present embodiment permits the door unlock control device 3 to unlock the vehicle-mounted door when the unlock switch 27 of the corresponding portable device 2 (regular portable device 2) is operated. To do.

  On the other hand, when the lock switch 28 of the portable device 2 is operated, a lock request ID code signal is transmitted from the portable device 2 by wireless communication. When the lock request ID code signal is received by the reception antenna 33, the reception signal (including the lock request operation code and the ID code of the portable device 2) is input from the reception circuit 34 to the verification ECU 35.

  When the received signal input from the receiving circuit 34 includes an ID code that matches the reference ID code, and the received signal includes a lock request operation code, the verification ECU 35 corresponds to the portable device 2. Is used to recognize that an operation for locking the vehicle-mounted door has been performed, and a door lock permission signal is output to the door ECU 40. When the door lock permission signal is input from the verification ECU 35, the door ECU 40 drives and controls the door lock motor 50 to lock the vehicle-mounted door.

  As described above, the electronic key system 1 according to the present embodiment permits the door unlock control device 3 to lock the vehicle-mounted door when the lock switch 28 of the corresponding portable device 2 (regular portable device 2) is operated.

Next, the operation of the electronic key system 1 will be described with reference to FIG. 1 using the conceptual diagram shown in FIG.
When a person who wears the corresponding portable device 2 (owner of the automobile) touches the door outside handle 4 as a passenger, a request signal is input from the verification ECU 35 of the door unlock control device 3 to the transmission circuit 31. Is done. And a request signal is transmitted via the electrode 32 for transmission and the human body of the owner of a motor vehicle. Then, the request signal is received by the portable device 2 via the receiving electrode 22. Then, in response to the request signal, the ID code signal is transmitted by wireless communication from the transmission antenna 26 of the portable device 2.

  Eventually, when the ID code signal is received by the receiving antenna 33 of the door unlock control device 3, the verification ECU 35 determines whether or not the ID code of the portable device 2 matches the reference ID code (ID Code verification). When the two ID codes match, a door unlock permission signal is input from the verification ECU 35 to the door ECU 40. As a result, the door lock motor 50 is driven and controlled by the door ECU 40, and the vehicle-mounted door is unlocked.

As described above, according to the present embodiment, the following operations and effects can be obtained.
(1) When a request signal transmitted from the door unlock control device 3 via wire transmission (in-body communication) via the transmission electrode 32 is received by the portable device 2 via the reception electrode 22, the portable device 2 transmits an ID code signal by wireless communication. When the ID code included in the ID code signal received by the door unlock control device 3 matches the reference ID code, unlocking of the in-vehicle door is permitted. That is, according to the electronic key system 1, a request signal is transmitted from the door unlock control device 3 by wired communication (in-body communication) instead of wireless communication. For this reason, the request signal is not wiretapped by a third party. Therefore, the security level can be improved.

  (2) In the door unlock control device 3, it is possible to omit a transmission antenna serving as a medium for transmitting a request signal by wireless communication. Here, the transmitting electrode 32 is lower in cost, smaller and lighter than the transmitting antenna. Accordingly, the cost and size and weight of the door unlock control device 3 can be reduced.

  (3) In the portable device 2, it is possible to omit a receiving antenna that is a medium for receiving a request signal by wireless communication. Here, the receiving electrode 22 is lower in cost, smaller and lighter than the receiving antenna. Therefore, the cost of the portable device 2 can be reduced and the size and weight can be reduced.

  (4) A request signal is transmitted from the door unlock control device 3 when the passenger touches the door outside handle 4 as a trigger. In short, it is not necessary to constantly send request signals. Therefore, the dark current can be reduced.

  (5) Wired communication (in-body communication) is employed when a request signal is transmitted from the door unlock control device 3. For this reason, it is not necessary to transmit the request signal over a wide range outside the vehicle. Therefore, the dark current can be reduced.

  (6) Wireless communication is employed when transmitting the ID code signal from the portable device 2. For this reason, it is possible to exchange complicated information between the portable device 2 and the door unlock control device 3. Therefore, a high security level can be obtained.

  (7) The in-vehicle door is unlocked (locked) by operating the unlock switch 27 (lock switch 28) of the portable device 2 from a point away from the vehicle. Accordingly, it goes without saying that the unlocking (locking) of the vehicle-mounted door can be realized by remote control and is simple. Of course, since wireless communication is employed for remote operation, a high security level can be obtained. In short, it is possible to achieve both excellent convenience and a high security level.

  (8) When the two-way communication between the portable device 2 and the door unlock control device 3 is started, the operation essential for riding such as touching the door outside handle 4 is actively utilized. Yes. In other words, no special operation is forced on the passenger. For this reason, there is no room to confuse passengers. In short, operability is considered. Therefore, excellent convenience can be obtained.

  (9) The portable device 2 has a wristwatch type, and the reference potential electrode 21 and the reception electrode 22 are exposed on the back surface of the portable device 2. For this reason, when the portable device 2 is attached to the arm, the reference potential electrode 21 and the reception electrode 22 are in direct contact with the arm. Therefore, human body communication using the human body as a signal transmission path can be suitably performed.

In addition, the said embodiment can also be changed and actualized as follows.
The portable device 2 is not limited to a watch type. The portable device 2 may be a bracelet type, a glasses type, a ring type, or the like. In short, the portable device 2 only needs to be in contact with the human body. And it is preferable that the portable device 2 is a thing closely_contact | adhered to a human body. In particular, the portable device 2 is more preferably one that is normally worn on a human body regardless of whether or not the user gets on the portable device 2.

-Wired communication is not limited to in-body communication.
-You may materialize to the electronic key system which permits the action | operation (starting) of a control object (vehicle-mounted engine) by an operation control apparatus (engine starting control apparatus) when the corresponding communication terminal (portable machine 2) is utilized. In this case, the same transmission electrode as the transmission electrode 32 is exposed on the surface of the engine switch operated when starting the vehicle-mounted engine.

  -Not only the electronic key system of a vehicle (for example, an automobile) but also may be embodied in an electronic key system of a building (for example, a house). That is, it is embodied in an electronic key system that permits operation (unlocking) of a controlled object (entrance door) by an operation control device (door unlock control device) when a corresponding communication terminal (mobile device 2) is used. Also good. In this case, the same transmission electrode as the transmission electrode 32 is exposed on the surface of the outdoor door knob (indoor door knob) operated when the front door is opened from the outside (indoor).

  ・ When the corresponding communication terminal (mobile device 2) is used, the operation control device (door unlock control device) is not limited to permitting the operation (unlock) of the controlled object (entrance door), You may actualize to the electronic key system (automatic door system) which opens actually.

The block diagram which shows the structure of an electronic key system. The conceptual diagram for demonstrating the effect | action of an electronic key system.

Explanation of symbols

1 ... Electronic key system.
2 ... portable device (communication terminal), 22 ... receiving electrode (second receiving means), 23 ... receiving circuit (second receiving means), 24 ... microcomputer (generating means), 25 ... transmitting circuit (second transmitting means) , 26 ... transmitting antenna (second transmitting means).

  DESCRIPTION OF SYMBOLS 3 ... Door unlock control apparatus (operation control apparatus), 31 ... Transmission circuit (1st transmission means), 32 ... Transmission electrode (1st transmission means), 33 ... Reception antenna (1st reception means), 34 ... Reception Circuit (first receiving means), 35... Verification ECU (control means).

Claims (9)

A trigger signal for establishing a two-way communication between the operation control device and the communication terminal, which is provided to an electronic key system that permits the operation of the controlled object by the operation control device when the corresponding communication terminal is used. A first transmission means for transmitting a request signal; a first reception means for receiving an ID code signal transmitted by wireless communication from a communication terminal in response to a request signal transmitted from the first transmission means; Control means for recognizing that the corresponding communication terminal is used and permitting the operation of the control object when the ID code included in the ID code signal received by the first receiving means matches the reference ID code In an operation control device comprising:
The operation control apparatus according to claim 1, wherein the first transmission means transmits a request signal by wired communication. The operation control device according to claim 1,
The operation control apparatus according to claim 1, wherein the first transmission means transmits the request signal through wired communication and through human body communication using the human body as a signal transmission path. The operation control device according to claim 2,
The operation control apparatus, wherein the first transmission means includes a transmission electrode serving as a medium for transmitting a request signal by in-vivo communication. A trigger signal for establishing a two-way communication between the operation control device and the communication terminal, which is provided to an electronic key system that permits the operation of the controlled object by the operation control device when the corresponding communication terminal is used. A second receiving means for receiving a request signal, and a signal including an ID code individually set for each communication terminal in order to respond to the request signal when the request signal is received by the second receiving means. In a communication terminal comprising a generating means for generating an ID code signal and a second transmitting means for transmitting the ID code signal generated by the generating means by wireless communication,
The communication terminal characterized in that the second receiving means receives a request signal transmitted by wire communication from the operation control device. The communication terminal according to claim 4,
The communication terminal characterized in that the second receiving means receives a request signal transmitted by in-vivo communication using the human body as a signal transmission path as wired communication from the operation control device. The communication terminal according to claim 5,
The communication terminal characterized in that the second receiving means includes a receiving electrode as a medium for receiving a request signal transmitted from the operation control device through in-vivo communication.   An electronic key system comprising the operation control device according to claim 1 and the communication terminal according to claim 4.   An electronic key system comprising the operation control device according to claim 2 and the communication terminal according to claim 5.   An electronic key system comprising the operation control device according to claim 3 and the communication terminal according to claim 6.

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