JP2011091679A - Communication device for human-body communication - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication device for human-body communication which can be held by a hand of a user, and of which the electrode can be arranged by being surely brought in contact with or close to a human body when held by the hand. <P>SOLUTION: This communication device 1 for human-body communication includes a device body 3 shaped into a form usable as a writing instrument, wherein a pair of reference electrode 5A and signal electrode 5B are formed in an outer periphery of the device body 3. In data transmission, a communication control section 7 relatively varies the potential of the signal electrode 5B with respect to that of the reference electrode 5A, and thereby performs control to transmit a signal in response to the potential difference between the reference electrode 5A and the signal electrode 5B to another apparatus. In data reception, the communication control section 7 detects a potential difference generated between the reference electrode 5A and the signal electrode 5B when a signal is transmitted from the other apparatus, and thereby performs control to receive a signal in accordance with the detected potential difference from the other apparatus. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a communication device for human body communication that performs communication using a human body as a signal transmission path.

  Conventionally, as a communication device for human body communication, those described in Patent Documents 1 and 2 below are known. These communication devices described in Patent Documents 1 and 2 have a pair of reference electrodes and signal electrodes, and in the case of the communication device described in Patent Document 1, each electrode is disposed so as to contact the human body. Further, in the case of the communication device described in Patent Document 2, the signal electrode is arranged so that electrostatic coupling is stronger with respect to the human body than the reference electrode.

  If a communication device having such a structure is used, a potential difference is generated between the reference electrode and the signal electrode, thereby transmitting a signal to another communication device or detecting a potential difference generated between the reference electrode and the signal electrode. It was possible to receive signals from other communication devices.

Japanese Patent Application Laid-Open No. 2002-9710 JP 2006-324775 A

  However, since the communication device described in Patent Document 1 is in the form of a wristwatch or a finger ring, if the communication device is worn or removed many times, it is attached to the finger or arm. The work to remove from the finger or arm is troublesome.

  Further, the communication device described in Patent Document 2 may be simply put in a pocket, so that it can be easily worn compared to a wristwatch-type or finger-ring-type communication device. If you put it in your clothes pocket, it will be undefined what direction the communication device will be. Therefore, in such a situation, the signal electrode may not be arranged at a position where electrostatic coupling is stronger with respect to the human body than the reference electrode, and in this case, the communication performance is lower than the standard level. There was a case. Further, since the communication performance changes when the orientation of the communication device changes, there is a problem that the communication performance becomes unstable, such as when the communication performance of the communication device is good or sometimes bad.

  The present invention has been made to solve the above-described problems, and the purpose of the present invention is to allow the user to hold it in his / her hand and to place the electrode in contact with or in close proximity to the human body. The object is to provide a communication device for human body communication.

Hereinafter, the configuration employed in the present invention will be described.
The communication device for human body communication according to the present invention changes the potential of the signal electrode relative to the potential of the reference electrode, so that a signal corresponding to the potential difference between the reference electrode and the signal electrode is transmitted to other devices. Transmitting and receiving a signal corresponding to the detected potential difference from the other device by detecting the potential difference generated between the reference electrode and the signal electrode when the signal is transmitted from the other device. At least one of them can be executed.

  In addition, when a user holds the communication device main body and uses it as a writing instrument, the pair of reference electrodes and signal electrodes are in contact with the human body or sandwich an inclusion of a predetermined size between the human body and the human body. It will be in the state hold | maintained in the position spaced apart from the human body by the predetermined dimension.

  Therefore, the communication device can be easily held with one hand and can be released with one hand, and must be worn on the other hand with one hand (for example, a wristwatch-type communication device or a ring-shaped communication device) ) Etc., the communication device can be used more easily.

  Also, since the holding method when using a writing instrument is usually the same for everyone, the reference electrode and the signal electrode should be appropriate for the user's hand without special attention. Therefore, good communication performance can be ensured, and variations in communication performance can be suppressed.

  In the communication device of the present invention, the power-on control unit may switch the state of the communication control unit from the standby state to the operating state when a predetermined power-on condition is satisfied.

If comprised in this way, when switching a communication apparatus to an operation state, since a user does not need to operate the switch for power-on operation, the convenience becomes high.
As a power-on condition, for example, when it is detected that a user has a communication device in his / her hand, the condition of the communication control unit can be changed from a standby state to an operating state. When switched, the communication control unit is in an operating state only by the user holding the communication device.

  In the communication apparatus of the present invention, the power-off control unit may switch the state of the communication control unit from the operating state to the standby state when a predetermined power-off condition is satisfied.

  With this configuration, when the communication device is switched to the standby state, the user does not have to operate the switch for turning off the power. For this reason, the user forgets to switch to the standby state and wastes power. Convenience is high.

  As the power-off condition, for example, when it is detected that the user has let go of the communication device can be mentioned. Under such conditions, the state of the communication control unit is switched from the operating state to the standby state. The communication control unit is put into a standby state simply by letting the user release the communication device.

  In the communication apparatus of the present invention, it is preferable that the reference electrode is disposed at a position where the reference body can be pinched with a fingertip when the user uses the apparatus body as a writing instrument. However, at such a position, the reference electrode is in contact with the human body or is held in a position separated from the human body by a predetermined dimension with an inclusion of a predetermined dimension interposed between the reference electrode and the human body. It is optional.

  Further, it is preferable that the signal electrode is disposed at a position in contact with the vicinity of the base of the finger when the user holds the apparatus main body in his hand and uses it as a writing instrument. However, the signal electrode is also held in such a position that the signal electrode is in contact with the human body or is separated from the human body by a predetermined dimension with an inclusion of a predetermined dimension between the signal electrode and the human body. It is arbitrary whether it is in the state where it was made.

  If the reference electrode and the signal electrode are arranged in such a positional relationship, each electrode is brought into contact with or close to the vicinity of the fingertip and the base of the finger when the user uses the apparatus body as a writing instrument. Can do.

  Further, in this case, if the reference electrode and the signal electrode have different lengths in the axial direction with the longitudinal direction of the apparatus body as the axial direction, the positional relationship between each electrode and the fingertip and the base of the finger is easy. It is preferable because it can be optimized.

  In particular, if the axial dimension of the signal electrode is longer than the axial dimension of the reference electrode, when optimizing the positional relationship between the pen tip side of the writing instrument and the fingertip, As a result, even if there is a difference in relative positional relationship between the signal electrode and the vicinity of the base of the finger, the axial dimension of the signal electrode is lengthened, so that it can be appropriately touched or placed close to the vicinity of the base of the finger. can do.

It is a figure which shows the communication apparatus for human body communication demonstrated as embodiment of this invention, (a) is the side view, (b) is a perspective view which shows a use condition, (c) is a block diagram which shows an internal structure. It is a figure which shows a human body communication system, (a) is explanatory drawing which shows the outline of the whole system, (b) is a block diagram which shows the internal structure of the communication apparatus incorporated in the chair. The flowchart of the communication control in a pen type communication apparatus. The flowchart of the communication control in the communication apparatus incorporated in the chair. The flowchart of the data processing performed in a personal computer. Explanatory drawing which shows the outline of the whole human body communication system demonstrated as another embodiment.

Next, an embodiment of the present invention will be described with an example.
[Configuration of pen-type communication device]
As shown in FIG. 1 (a) and FIG. 1 (b), a communication device 1 for human body communication exemplified as an embodiment of the present invention includes a device main body 3 that can be used as a writing instrument. A pair of reference electrodes 5 </ b> A and signal electrodes 5 </ b> B are provided on the outer periphery of the apparatus body 3.

  The reference electrode 5A and the signal electrode 5B are both made of metal, and the reference electrode 5A is disposed at a position where the user can hold the apparatus main body 3 with his / her fingertip when the apparatus main body 3 is used as a writing instrument. . Further, the signal electrode 5B is disposed at a position in contact with the vicinity of the base of the finger when the user uses the apparatus main body 3 as a writing instrument.

  Further, as shown in FIG. 1A, the reference electrode 5A and the signal electrode 5B have different lengths in the axial direction with the longitudinal direction of the apparatus body 3 as the axial direction. Specifically, the axial dimension of the signal electrode 5B is longer than the axial dimension of the reference electrode 5A. Thus, if the axial dimension of the signal electrode 5B is made long, when the positional relationship between the pen tip side of the writing instrument and the fingertip is optimized, the signal electrode 5B Even if there is a difference in the relative positional relationship with the vicinity of the finger base, the signal electrode 5B can be appropriately brought into contact with the vicinity of the finger base.

  Further, the communication device 1 incorporates a communication control unit 7 as shown in FIG. The communication control unit 7 includes a communication circuit 11 connected to the reference electrode 5A and the signal electrode 5B, and a microcomputer 13 (hereinafter abbreviated as a microcomputer 13) including a CPU, a ROM, a RAM, and the like. The communication circuit 11 includes a transmission circuit, a reception circuit, a switch for switching these circuits, and the like, and data transmission / reception by the communication circuit 11 is controlled by the microcomputer 13.

  The communication device 1 configured as described above can communicate with other devices via the user's body when the user wears the communication device 1. Specifically, the transmission / reception control of data by the communication control unit 7 can be executed. When the data transmission is executed, the communication control unit 7 sets the potential of the signal electrode 5B relative to the potential of the reference electrode 5A. Thus, control is performed to transmit a signal corresponding to the potential difference between the reference electrode 5A and the signal electrode 5B to another device. A signal transmitted by such control is transmitted to other devices via the user's body.

  Further, when receiving data in the communication device 1, the communication control unit 7 detects a potential difference generated between the reference electrode 5A and the signal electrode 5B when a signal is transmitted from another device. Then, control is performed to receive a signal corresponding to the detected potential difference from another device.

  The communication device 1 is used by the user as a writing instrument. More specifically, the data required for detecting the user's handwriting is transferred to a device different from the communication device 1. It is a device to do. Specifically, the acceleration sensor 15 that detects the acceleration in the triaxial direction of the communication device 1, the gyro sensor 17 that detects the angular velocity in the triaxial direction of the communication device 1, and whether the pen tip is in contact with the writing target surface. A pen tip sensor 19 for detecting whether the sensor is separated from the surface is provided, and detection values from these sensors are input to the microcomputer 13.

[Configuration of human body communication system]
The above-described communication device 1 is used in a human body communication system as shown in FIG. This system includes a chair-side communication device 23 incorporated in the chair 21 and a personal computer 27 wired to the chair-side communication device 23 via a cable 25.

  When the user performs writing using the communication device 1 as a writing instrument, the data is transmitted to the chair side communication device 23 via the human body, and further, the data is transferred from the chair side communication device 23 to the personal computer 27. The The personal computer 27 estimates the user's handwriting by calculating the movement of the communication device 1 based on the data acquired from the communication device 1, and displays the estimated locus corresponding to the handwriting on the display device 29. As a result, the display device 29 displays a drawn matter drawn by the user using the communication device 1 as a writing instrument.

  In addition, the personal computer 27 can receive data in parallel from the plurality of communication devices 1, and displays a plurality of drawn objects based on the plurality of sets of data on the display device 29. Therefore, if this system is used, a plurality of users can make additions to each other's drawings. For example, if this system is used in a video conference system, all the participants in the conference are shared. You can draw on the screen.

  As shown in FIG. 2B, the chair side communication device 23 includes a reference electrode 31A, a signal electrode 31B, a communication control unit 33, and the like as the configuration equivalent to the communication device 1, and the communication control unit 33 A communication circuit 35 and a microcomputer 36 (hereinafter abbreviated as a microcomputer 36) are provided. Further, the chair side communication device 23 has a configuration different from that of the communication device 1, and a personal computer communication interface for communicating with the pressure sensor 38 for detecting that the user is sitting on the chair 21 and the personal computer 27. 39 is provided.

[Control executed in pen-type communication device]
Next, the control executed in the communication device 1 will be described based on the flowchart of FIG.

  In this communication device 1, the state of the communication control unit 7 is in a standby state until the user holds the pen (= communication device 1) (S101), and the user has held the pen in his hand. Is detected, the state of the communication control unit 7 is switched from the standby state to the operating state (S103).

  Whether the user holds the pen in his hand can be determined by the change in capacitance when the reference electrode 5A and the signal electrode 5B come into contact with the human body. In addition, when it is detected by the acceleration sensor 15 or the gyro sensor 17 that the pen has moved, it may be determined that the user has held the pen in his hand.

  Subsequently, the communication device 1 determines whether or not the user has released the pen (S105). Here, the release of the pen may be determined by the capacitance of the reference electrode 5A and the signal electrode 5B, as in the case of holding the pen, or the pen may not be moved by the acceleration sensor 15 or the gyro sensor 17. May be detected and determined.

  If it is determined in S105 that the user has released the pen (S105: YES), the communication device 1 switches the state of the communication control unit 7 from the operating state to the standby state (S107), and returns to S101. On the other hand, if it is determined in S105 that the user has not released the pen (S105: NO), the communication device 1 determines whether or not writing has started (S109).

  Whether or not writing has started is determined by detecting whether or not the pen tip is in contact with the writing target surface with the pen tip sensor 19. If it is determined in S109 that writing has not started (S109: NO), the process returns to S105. Therefore, when the user holds the pen and has not started writing, the user waits in a state where S105 and S109 are executed alternately. If writing is started in this standby state (S109: YES), the process proceeds to S111. On the other hand, if the user releases the pen in this standby state (S105: YES), the process proceeds to S107.

  In S109, when the user starts writing (S109: YES), the communication device 1 detects acceleration data and angular velocity data by the acceleration sensor 15 and the gyro sensor 17 (S111), and the detected acceleration data and angular velocity data. Is transmitted to the chair side communication apparatus 23 via a human body (S113).

  Then, it is determined whether or not writing has been completed (S115). Whether or not the writing has ended is determined by detecting whether or not the pen tip is separated from the writing target surface by the pen tip sensor 19. If it is determined in S115 that writing has not been completed (S115: NO), the process returns to S111. Thereby, S111 to S115 are repeatedly executed, and the acceleration data and the angular velocity data detected by the acceleration sensor 15 and the gyro sensor 17 are sequentially transmitted to the chair side communication device 23 via the human body. Become.

  On the other hand, if it is determined in S115 that writing has been completed (S115: YES), the process returns to S109. Therefore, if writing is resumed here, the process proceeds to S111 again. If writing is not resumed, the process returns to S105 and waits in a state where S105 and S109 are executed alternately.

  The above processing can be realized if the communication device 1 has a transmission function. However, if the communication device 1 also has a reception function, the data transmitted from the chair side communication device 23 can be processed. It can also be received. Therefore, in this case, the communication device 1 and the chair-side communication device 23 exchange authentication data with each other, and it is possible to start transmission / reception of data when mutual authentication is established.

[Control executed in chair side communication device]
Next, the control performed in the chair side communication apparatus 23 is demonstrated based on the flowchart of FIG.

  In the chair side communication device 23, the state of the communication control unit 33 is in a standby state until the user is seated on the chair 21 (S201), and when it is detected that the user is seated on the chair 21, The state of the communication control unit 33 is switched from the standby state to the operating state (S203).

  The fact that the user has been seated on the chair 21 can be detected by the pressure sensor 38. Alternatively, instead of the pressure sensor 38, changes in capacitance of the reference electrode 31A and the signal electrode 31B may be detected.

  Subsequently, the chair side communication device 23 determines whether or not the user has left the chair 21 (S205). Here, the fact that the user has left the chair 21 can be detected by the pressure sensor 38 in the same manner as when the user is seated on the chair 21.

  If it is determined in S205 that the user has left the chair 21 (S205: YES), the chair side communication device 23 switches the state of the communication control unit 33 from the operating state to the standby state (S207), and proceeds to S201. Return. On the other hand, when it is determined in S205 that the user is not away from the chair 21 (S205: NO), the chair side communication device 23 determines whether or not reception of data is started (S209).

  Whether or not data reception has started is determined when the data string indicating the start of transmission is transmitted from the communication apparatus 1 and reception of data is started when the data string is received. Further, as already described, since the communication device 1 and the chair side communication device 23 may exchange authentication data with each other, if such a configuration is adopted, after the determination in S209, the authentication data is mutually exchanged. It may be determined that the reception of data is started when the exchange is performed and mutual authentication is established.

  If it is determined in S209 that data reception has not started (S209: NO), the process returns to S205. Therefore, if the user is sitting on the chair 21 and has not started receiving data (for example, the user is sitting on the chair 21 but does not have the communication device 1 in his / her hand), S205 And S209 are waited in a state where they are alternately executed. If data reception is started in this standby state (S209: YES), the process proceeds to S211. On the other hand, if the user leaves the chair 21 in this standby state (S205: YES), the process proceeds to S207. .

  In S209, when the user starts receiving data (S209: YES), the chair side communication device 23 continuously receives the transmitted data (S211), and the received data is transmitted to the personal computer via the cable 25. 27 (S213).

  Then, it is determined whether or not the data reception has been completed (S215). Whether or not the reception of data has ended is determined based on the reception of data indicating the end of data from the communication device 1. If it is determined in S215 that the data reception has not ended (S215: NO), the process returns to S211. As a result, S211 to S215 are repeatedly executed, and the received data is sequentially transmitted to the personal computer 27 via the cable 25.

  On the other hand, if it is determined in S215 that the data reception has been completed (S215: YES), the process returns to S209. Therefore, if the data reception is resumed, the process proceeds to S211 again. If the data reception is not resumed, the process returns to S205 and waits in a state where S205 and S209 are alternately executed. Become.

[Processes executed on PC]
Next, processing executed in the personal computer 27 will be described based on the flowchart of FIG.

  The personal computer 27 determines whether or not data has been transmitted from the chair side communication device 23 (S301), and if data has not been transmitted (S301: NO), repeats S301 and waits. In S301, when it is determined that data has been transmitted from the chair side communication device 23 (S301: YES), the data is received (S303).

  The data received in S303 is acceleration data and angular velocity data transmitted from the communication device 1 via the chair side communication device 23, and the personal computer 27 moves the communication device 1 based on these acceleration data and angular velocity data. Is calculated to estimate the handwriting of the user (S305). Then, a drawing process is performed so as to draw a locus corresponding to the handwriting of the user (S307). As a result of S307, the display device 29 displays a drawn object that the user has drawn using the communication device 1 as a pen.

  Then, the personal computer 27 determines whether or not the data reception from the chair side communication device 23 has been completed (S309). If the data reception has not been completed (S309: NO), the process returns to S303. As a result, S303 to S309 are repeatedly executed, and the data transmitted from the chair side communication device 23 is sequentially received, and the drawing corresponding to the received data is sequentially displayed on the display device 29. I will go.

  On the other hand, if it is determined in S309 that the data reception has been completed (S309: YES), the process returns to S301. Therefore, the personal computer 27 repeats S301 again and waits until the next data is transmitted.

[effect]
According to the communication device 1 configured as described above, the reference electrode 5A and the signal electrode 5B naturally come into contact with the human body when the user uses the communication device 1 as a writing instrument. Therefore, the reference electrode 5A and the signal electrode 5B can be arranged at appropriate positions with respect to the user's hand without paying particular attention to how to hold them, thereby ensuring good communication performance. In addition, variations in communication performance can be suppressed.

  Further, such a writing instrument type communication device 1 can be easily held with one hand and can be released with one hand, and must be attached to the other hand with one hand (for example, a wristwatch). Type communication device, finger ring type communication device) and the like.

  Further, in the communication device 1, when “the user has held the communication device 1 in hand” is detected in S101 to S103 (an example in which the predetermined power-on condition referred to in the present invention is satisfied). In other words, the microcomputer 13 that executes S101 to S103 corresponds to an example of the power-on control means in the present invention. ). Therefore, when the communication device 1 is switched to the operating state, the user does not have to operate a switch for performing a power-on operation, which increases convenience.

  Further, in the communication device 1, when it is detected in S <b> 105 to S <b> 107 that “the user has let go of the communication device 1” (corresponding to an example in which a predetermined power-off condition in the present invention is satisfied) )), The state of the communication control unit 7 is switched from the operating state to the standby state (that is, the microcomputer 13 executing S105 to S107 corresponds to an example of the power-off control means in the present invention). Therefore, when the communication device 1 is switched to the standby state, the user does not have to operate the switch for turning off the power, and thus forgetting to switch to the standby state and consuming power wastefully. In this respect, convenience is enhanced.

[Other Embodiments]
As mentioned above, although embodiment of this invention was described, this invention is not limited to said specific one Embodiment, In addition, it can implement with a various form.

  For example, in the above embodiment, the chair-side communication device 23 is incorporated in the chair 21 and data is transferred from the chair-side communication device 23 to the personal computer 27. However, the specific example of the device that receives data from the communication device 1 is described. The general configuration is not limited to the above.

  For example, as illustrated in FIG. 6, when the user has a wearable device 41, the wearable device 41 has a built-in transmission / reception means equivalent to the chair side communication device 23 and a data processing means equivalent to the personal computer 27. Thus, data can be sent to the wearable device 41 via the human body, and the wearable device 41 can perform processing such as handwriting estimation and drawing.

  Further, in the above-described embodiment, it has been described that the communication device 1 detects acceleration data and angular velocity data and performs handwriting estimation from those data. However, a specific method for handwriting estimation using a pen-type input device has already been described. Since various methods have been proposed, these known handwriting estimation methods can be arbitrarily employed. Specifically, a method of reading coordinates using a pen-type input device and a tablet, a technique used in a so-called electronic blackboard, or the like may be used.

  Moreover, in the said embodiment, although the reference | standard electrode and the signal electrode each illustrated the structure which contacts a human body directly like the technique of patent document 1, like the technique described in patent document 2, In addition, a configuration in which the electrode itself does not directly contact the human body may be employed.

  More specifically, for example, in the above-described embodiment, each electrode is covered with a coating having a predetermined thickness (corresponding to an inclusion having a predetermined dimension in the present invention), and the predetermined thickness ( The electrode may be held at a position separated from the human body by a predetermined dimension). In this case, the electrode close to the human body with the film interposed therebetween may be used as the signal electrode, and the reference electrode may be disposed on the opposite side of the human body with the signal electrode interposed therebetween. Thus, the performance of the communication device can be improved.

  Furthermore, in the said embodiment, about the example of the one-way communication which transmits data to the chair side communication apparatus 23 from the communication apparatus 1, and the example of the two-way communication which the communication apparatus 1 and the chair side communication apparatus 23 transmit / receive data mutually. Although mentioned, it is good also as a structure which transmits data to the communication apparatus 1 from the chair side communication apparatus 23 depending on a use.

  DESCRIPTION OF SYMBOLS 1 ... Communication apparatus, 3 ... Apparatus main body, 5A, 31A ... Reference electrode, 5B, 31B ... Signal electrode, 7, 33 ... Communication control part, 11, 35 ... Communication circuit , 13, 36 ... microcomputer (microcomputer), 15 ... acceleration sensor, 17 ... gyro sensor, 19 ... nib sensor, 21 ... chair, 23 ... chair side communication device, 25 ... cable, 27 ... personal computer, 29 ... display device, 38 ... pressure sensor, 39 ... communication interface for personal computer, 41 ... wearable device.

Claims (8)

A communication device for human body communication that enables communication with other devices via the user's body when the user wears the device,
An apparatus main body that can be used as a writing instrument by a user;
When the device body is used as a writing instrument by the user's hand, it is held in a position in contact with the human body or at a position separated from the human body by the predetermined dimension with an inclusion of a predetermined dimension interposed between the apparatus body and the human body. A pair of reference and signal electrodes that are
"Control for transmitting a signal corresponding to a potential difference between the reference electrode and the signal electrode to the other device by changing the potential of the signal electrode relative to the potential of the reference electrode" and “Control for receiving a signal corresponding to the detected potential difference from the other device by detecting a potential difference generated between the reference electrode and the signal electrode when a signal is transmitted from the other device” A communication device for human body communication, comprising: a communication control unit capable of executing at least one of the controls. The communication device for human body communication according to claim 1, further comprising power-on control means for switching the state of the communication control unit from a standby state to an operating state when a predetermined power-on condition is satisfied. . The power-on control unit switches the state of the communication control unit from a standby state to an operating state when it is detected that the user has the communication device in his / her hand. Communication device for human body communication. The power-off control means for switching the state of the communication control unit from an operating state to a standby state when a predetermined power-off condition is established. 5. A communication device for human body communication according to 1. The human body according to claim 4, wherein the power-off control unit switches the state of the communication control unit from an operating state to a standby state when it is detected that a user has released the communication device. Communication device for communication. The reference electrode is disposed at a position where the user can hold the apparatus main body as a writing instrument while holding the apparatus body in his / her hand, and is in contact with the human body at that position or has a predetermined dimension between the human body and the body. It is in a state of being held at a position separated from the human body by the predetermined dimension across the inclusion,
The signal electrode is disposed at a position in contact with the vicinity of the base of the finger when the device body is used by a user as a writing instrument and is in contact with the human body at that position or between the human body The communication for human body communication according to any one of claims 1 to 5, wherein the communication device is in a state of being held at a position separated from the human body by an amount corresponding to the predetermined dimension with an inclusion of a predetermined dimension interposed therebetween. apparatus. 7. The human body communication according to claim 6, wherein the reference electrode and the signal electrode have different lengths in the axial direction with the longitudinal direction of the device body as an axial direction. 8. Communication equipment. The communication device for human body communication according to claim 7, wherein an axial dimension of the signal electrode is longer than an axial dimension of the reference electrode.

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