JP2011072474A - Biological information measuring device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a biological information measuring device which differentially detects a potential difference between two electrodes for biological sensors and achieves a reduction in a space while having a ground electrode separately from two electrodes. <P>SOLUTION: The biological information measuring device 1 is equipped with first and second electrodes 3, 4 disposed in a manner to make contact with or to be capacitively coupled to a human body M, the ground electrode 5 capacitively coupled with a ground, a device body part 2 having the first electrode 3 and the second electrode 4 provided to be separate from each other on a first side surface 2a being a human body side when being attached to the human body and the ground electrode 5 on a second side surface 2b which is on the side opposite from the human body side when being attached to the human body and is opene to a space side, and a biological information receiving part 10 which is embedded in the device body part 2, operates by using the ground as a reference potential, and differentially detects the potential difference between the first and second electrodes 3, 4 for acquiring the biological information. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a biological information measuring apparatus in which electrodes are arranged on a living body, biological information is measured, and the measured biological information is transmitted via the living body.

  Conventionally, an information transmission system via a human body that shares an electrode used for detection of biological information and an electrode used for communication has been proposed (see, for example, Patent Document 1). A human body-mediated information transmission system described in Patent Document 1 includes a first electrode that is in contact with or capacitively coupled to the chest of a human body, and a second electrode that is in contact with or capacitively coupled to the human body at a position away from the first electrode. The biological information is extracted from the signal detected by the first electrode through an amplifier and a filter, and the second electrode is connected to the ground on a circuit such as an amplifier to function as a ground electrode. On the other hand, the data transmission unit transmits the extracted biological information such as the heartbeat from the first electrode via the human body.

International Publication No. 2006/062112

  However, the human body information transmission system described in Patent Document 1 has a configuration in which one of the two electrodes (first and second electrodes) arranged in the living body is handled as a ground electrode, so that the two electrodes The potential difference appearing on the signal cannot be detected differentially, and it has been difficult to achieve sufficient detection accuracy.

  On the other hand, if one side electrode is not treated as a ground electrode and the signals appearing on the first electrode and the second electrode are detected differentially, the ground cannot be taken by the human body, so the detection sensitivity is high. It becomes insufficient.

  In addition, if it is not limited to the information transmission system via the human body, a general electrocardiogram measuring device has a plurality of electrodes for biosensors wire-connected to the chest of the human body and is connected to any part of the human body such as a foot. The ground electrode is arranged. However, if a location for ground electrodes is required at a different location on the human body in addition to locations for multiple biosensor electrodes, a compact device with multiple biosensor electrodes and ground electrodes is designed. However, it becomes a problem from the point of space saving.

  The present invention has been made in view of such a point, and realizes sufficient detection accuracy by differentially detecting a potential difference appearing on two biosensor electrodes and providing a ground electrode separately from the two electrodes. It is an object of the present invention to provide a biological information measuring device that can save space.

  One aspect of the biological information measuring apparatus of the present invention includes a first electrode and a second electrode arranged so as to be in contact with or capacitively coupled to a living body, a ground electrode that is capacitively coupled to the ground, and a first body that is on the living body side when the living body is worn. The first electrode and the second electrode are provided apart from each other on one side surface, and the ground electrode is provided on a second side surface opened to the space side opposite to the living body side when the living body is mounted. A body information reception unit that is built in the body part of the device, operates in the ground as a reference potential, and detects biological potential information by differentially detecting a potential difference between the electrodes of the first and second electrodes. And a portion.

  According to the biological information measuring apparatus configured as described above, the first and second electrodes are provided on the first side surface of the device main body as the biological sensing electrodes, and are in contact with or capacitively coupled to the living body. The ground electrode is provided on the second side opposite to the living body side and capacitively coupled to the ground, and the ground electrode can provide the ground of the living body information receiving unit, and the potential difference appearing on the first and second electrodes can be provided. It can detect by differential and realize sufficient detection accuracy. Moreover, although the ground electrode is provided separately from the first and second electrodes, the ground electrode is provided on the second side surface opposite to the living body side in the device main body provided with the first and second electrodes. Since it is provided, the ground of the biological information receiving unit can be secured without increasing the mounting area, and space saving can be achieved.

  According to another aspect of the biological information measuring apparatus of the present invention, the device main body includes biological communication means for performing communication via a living body using at least the first electrode as a data communication electrode, The communication means includes a transmitter that transmits communication data from the data communication electrode via a living body.

  According to this configuration, since the first electrode is used as a living body sensing electrode and a data communication electrode, the number of parts can be reduced and the apparatus can be downsized.

  In another aspect of the biological information measuring apparatus of the present invention, the biological communication unit has a receiving unit that receives and demodulates a signal transmitted to the living body with the data communication electrode. Thereby, information can be transmitted from the outside to the biological information measuring device by biological communication without providing a receiving electrode separately.

  In the biometric information measuring apparatus, the biometric communication unit may start communication with the acquisition of the biometric information by the biometric information receiving unit as a trigger.

  In the biological information measuring apparatus, an electrocardiogram or myoelectric that appears as a potential difference between the first and second electrodes can be measured as the biological information.

  In the biometric information measuring apparatus, the biometric communication unit may transmit the biometric information acquired by the biometric information receiving unit and the personal identification ID of the biometric information measurement target person via the living body. good. Thereby, data management in which the biometric information and the personal identification ID are linked becomes possible.

  In the biometric information measuring apparatus, the biometric information may be transmitted from the transmission unit, and a receiver-side terminal may be operated using the biometric information.

  According to the present invention, it is possible to realize a sufficient detection accuracy by differentially detecting a potential difference appearing on two biosensor electrodes, and even if a ground electrode is provided separately from the two electrodes, the biometric information measuring device can be saved. Space can be achieved.

It is a conceptual diagram of the biological information measuring device which concerns on the 1st Embodiment of this invention. It is a circuit block diagram of the biological information measuring device which concerns on 1st Embodiment. It is a conceptual diagram of the biological information measuring device which concerns on 2nd Embodiment. It is a block diagram of the biological information measuring device concerning a 2nd embodiment. It is a circuit block diagram of the human body communication transmission part and biometric information receiving part in 2nd Embodiment. It is a related figure of the frequency band of biometric information, and the use frequency band by human body communication. It is a circuit block diagram of the human body communication transmission part and biometric information reception part which deform | transformed partially in 2nd Embodiment. It is a block diagram provided with the human body communication receiving part in the human body communication means in 2nd Embodiment. It is a circuit block diagram of the human body communication receiving part and biometric information receiving part in 2nd Embodiment. It is a block diagram of the biological information measuring device which concerns on 3rd Embodiment. It is a circuit block diagram of the human body communication transmission part and biometric information receiving part in 3rd Embodiment. It is the block diagram provided with the human body communication receiving part in the human body communication means in the biological information measuring device which concerns on 3rd Embodiment. It is a circuit block diagram of the human body communication receiving part and biometric information receiving part in 3rd Embodiment. It is the conceptual diagram which is transmitting the personal identification ID information while transmitting the electrocardiogram information as biometric information. It is an electrocardiogram waveform diagram measured by the biological information measuring device.

Hereinafter, embodiments of the present invention will be specifically described with reference to the accompanying drawings.
1A and 1B are conceptual diagrams of a biological information measuring apparatus according to the first embodiment of the present invention, and FIG. 1C is a schematic diagram of the biological information measuring apparatus according to the first embodiment. It is an external view.

  The biological information measuring apparatus 1 according to the present embodiment includes a device main body 2, first and second electrodes 3 and 4 provided on the first side surface 2 a that is one side surface of the device main body 2, and The ground electrode 5 provided on the second side surface 2b which is the other side surface of the device main body 2 and the biological information receiving unit 10 (see FIG. 2) built in the device main body 2 are main components. .

  As shown in FIG. 1 (c), when the biological information measuring apparatus 1 is attached to a human body M that is a living body using the mounting tool 6, the first side surface 2 a of the device main body 2 is located with respect to the human body M. The second side surface 2b of the device main body 2 is in contact with the space side facing away from the human body side.

  The 1st and 2nd electrodes 3 and 4 are provided in the 1st side surface 2a of the apparatus main body part 2 as an electrode for biological sensing. The first and second electrodes 3 and 4 are in contact with or capacitively coupled to the human body M. The first electrode 3 and the second electrode 4 need to be separated by a distance capable of detecting biological information (electrocardiogram or myoelectricity) to be measured. The first side surface 2a (and the second side surface 2b) of the device main body 2 has a length that allows the first electrode 3 and the second electrode 4 to be spaced apart at an appropriate interval. The ground electrode 5 is provided on the second side surface 2b opposite to the human body side, and is capacitively coupled to the ground. Since the second side surface 2b is the back surface of the first side surface 2a in the device main body 2, the ground electrode 5 is provided separately from the biological sensing electrode, but the mounting area is two electrodes for biological sensing. The mounting area required for the first and second electrodes 3 and 4 is the same.

  As shown in FIGS. 1A and 1B, the human body M is capacitively coupled by a capacitance Cs with the floor surface or the like as the ground. Since the ground electrode 5 is provided on the second side surface 2b facing away from the human body M, the ground electrode 5 is capacitively coupled with the ground such as a floor surface or a wall by a capacitance Cs.

  FIG. 2 is a circuit configuration diagram of the biological information measuring apparatus 1 according to the present embodiment. The device main body 2 has a biological information receiving unit 10 built therein. The biological information receiving unit 10 includes a differential amplifier 11 that differentially amplifies the potential difference between the first electrode 3 and the second electrode 4. The output terminal of the differential amplifier 11 is connected to a low pass filter (LPF) 12. The cut-off frequency of the low-pass filter 12 depends on the frequency band of the biological information, but is set to about 500 Hz if electrocardiogram or myoelectricity is measured. A band elimination filter 13 is connected to the output terminal of the low-pass filter 12. The band removal filter 13 has a removal band set so as to remove 50 Hz or 60 Hz, which is a power supply noise band. A power supply voltage is supplied from the power supply unit 14 to the components (11, 12, 13) of the biological information receiving unit 10. Further, a reference potential is provided to the constituent elements (11, 12, 13, 15) of the biological information receiving unit 10 by the ground electrode 5 capacitively coupled to the ground such as a floor or a wall. In the present embodiment, in order to remove the baseline fluctuation, the ground electrode 5 is connected to the constituent elements (11, 12, 13, 14) of the biological information receiving unit 10 via the integrator 15 to provide a stable ground. providing.

  The output format of the biological information acquired by the biological information receiving unit 10 is determined according to the system configuration. For example, data may be transmitted to the receiver as will be described later, and may be stored and / or displayed on the biological information receiving unit 10.

  The biological information measuring apparatus 1 configured as described above is configured so that the first side surface 2a (first and second electrodes 3 and 4) of the device main body 2 is in surface contact with the human body M, and the wearing tool 6 is attached. It is attached to the human body M using The first and second electrodes 3 and 4 are in contact with or capacitively coupled to the human body M, while the ground electrode 5 is capacitively coupled to the ground. Since the potential detected by the first electrode 3 is input to the non-inverting input terminal of the differential amplifier circuit 11, and the potential detected by the second electrode 4 is input to the inverting input terminal of the differential amplifier circuit 11, The potential difference between the first electrode 3 and the second electrode 4 is differentially amplified. At this time, noise superimposed on each signal in the same phase between the first and second electrodes 3 and 4 and the differential amplifier circuit 11 can be removed by the differential amplifier circuit 11. The differential amplification signal output from the differential amplifier circuit 11 is cut by the low-pass filter 12 from harmonic noise contained in a higher frequency than the frequency band of biological information, and further by the band removal filter 13 at 50 Hz or 60 Hz. The power supply noise is removed and biological information is acquired.

  In addition, the ground electrode 5 provided on the second side surface 2b opposite to the human body M in the device main body 2 is capacitively coupled to the ground such as a floor or a wall, and the ground of the biological information receiving unit 10 is the ground electrode. Provided by 5. Therefore, the biological information receiving unit 10 can operate using the ground provided by the ground electrode 5 as a reference potential, and can realize the necessary detection sensitivity.

  FIG. 15A is an electrocardiogram waveform diagram measured by a biological information measuring apparatus having a conventional configuration, and FIG. 15B is an electrocardiogram measured by the biological information measuring apparatus according to the present embodiment (FIG. 2). FIG. The biological information measuring device of the conventional configuration has a configuration in which the ground electrode 5 is removed from the circuit configuration shown in FIG. 2, the second electrode 4 is a ground electrode, and the differential amplifier circuit 11 is an amplifier. From the comparison result of the two electrocardiographic waveforms, it can be seen that the measurement accuracy of the biological information measuring apparatus according to the present embodiment is improved.

  According to the present embodiment, the first and second electrodes 3 and 4 are provided on the first side surface 2a of the device main body 2 as living body sensing electrodes and are in contact with or capacitively coupled to the human body M. The ground electrode 5 is provided on the second side surface 2b opposite to the human body side and is capacitively coupled to the ground, and the ground electrode 5 provides the ground of the biological information receiving unit 10, so the first and second A potential difference appearing at the electrodes 3 and 4 can be detected differentially, and sufficient detection accuracy can be realized. In addition, although the ground electrode 5 is provided separately from the first and second electrodes 3 and 4, the ground electrode 5 is a device body portion 2 provided with the first and second electrodes 3 and 4, and the human body side. Since it is provided on the opposite second side surface 2b, the ground of the biological information receiving unit 10 can be secured without increasing the mounting area, and space saving can be achieved.

Next, a biological information measuring apparatus according to the second embodiment will be described.
In the second embodiment, biological information acquired in the biological information measuring apparatus according to the first embodiment is transmitted to a receiver via a human body using a biological sensing electrode. is there.

  FIG. 3 is a conceptual diagram of a biological information measuring apparatus according to the second embodiment. In the following description, the same components as those of the biological information measuring apparatus 10 shown in FIGS. 1A, 1B, and 1C will be described using the same reference numerals. In the biological information measuring apparatus 20 according to the present embodiment, the arrangement of the first and second electrodes 3 and 4 and the ground electrode 5 is the same as the structure shown in FIGS. The second electrodes 3 and 4 are provided on the first side surface 2a of the device main body 2 and are in contact with or capacitively coupled to the human body M. The ground electrode 5 is separated from the human body M. It is provided on the opposite second side surface 2b and is capacitively coupled to the ground. The biological information measuring device 20 includes a human body communication means 21 and a biological information receiving unit 22 not shown in FIG.

  The human body M has a transceiver 30 attached to the arm. Communication (electric field communication) via the human body M is performed between the human body communication means 21 and the transceiver 30. The transmitter / receiver 30 includes an electrode 31 that is in contact with or capacitively coupled to an arm of the human body M, an electrode 32 that is disposed on the opposite side of the human body M, and a communication circuit 33 that has a transmission function and a reception function. And The electrode 32 is capacitively coupled to the ground (the ground electrode 5 and the floor, wall, etc.). If the transmitter / receiver 30 is used only for reception and does not perform transmission, a receiver without a transmission function may be used.

FIG. 4 is a block diagram of the biological information measuring apparatus according to the second embodiment.
The flow of signals between the human body communication means 21 and the biological information receiving unit 22 provided in the device main body 2 and the first and second electrodes 3 and 4 is shown. The human body communication means 21 includes a human body communication transmitter 21a. In the present embodiment, the first and second electrodes 3 and 4 are connected to the biological information receiving unit 22 so that biological information (potential difference) is input to the biological information receiving unit 22, and the human body communication transmitting unit 21a is used for data communication. The biological information measured by the biological information receiving unit 22 connected to the first electrode 3 as an electrode is transmitted from the first electrode 3.

FIG. 5 shows a circuit configuration diagram of the human body communication transmitting unit 21 a and the biological information receiving unit 22.
In the biological information receiving unit 22, the first electrode 3 is connected to the non-inverting terminal of the differential amplifier 24 via the low-pass filter 23a, and the second electrode 4 is connected to the inverting terminal of the differential amplifier 24 via the low-pass filter 23b. It is connected to the. A cutoff frequency of about 500 Hz is set for the low-pass filters 23a and 23b. A band elimination filter 25 is connected to the output terminal of the differential amplifier 24. In the band elimination filter 25, 50 Hz or 60 Hz, which is a power supply noise band, is set as the elimination band. The biological information that is an analog signal output from the band elimination filter 25 is converted into a digital signal by the analog-digital converter 26. The biological information acquired by the biological information receiving unit 22 is selected by the multiplexer 27 and input to the human body communication means 21. The multiplexer 27 selectively inputs the biometric information output from the biometric information receiving unit 22 and the transmission information to be transmitted by the original data communication to the human body communication means 21.

  The human body communication transmission unit 21 a modulates the transmission data selected by the multiplexer 27 by the modulator 28. A local oscillation signal for up-conversion to the transmission frequency is input from the local oscillator 29 to the mixer 31. The mixer 31 mixes the modulated transmission data and the local oscillation signal, and up-converts the transmission data to the transmission frequency band. The transmission signal that is the output of the mixer 31 is input to the amplifier 33 through the band-pass filter 32 and amplified to a predetermined transmission level. In the band pass filter 32, a pass band corresponding to the transmission frequency is set.

FIG. 6 shows the relationship between the frequency band of biological information and the frequency band used for human body communication.
Since biological information (for example, electrocardiogram, myoelectricity) measured from the human body M is a band of 500 Hz or less, it is desirable to set the cutoff frequency of the low-pass filters 23a and 23b to 500 Hz. Thereby, it is possible to prevent various noises in a band higher than 500 Hz from mixing. Further, since the frequency band of human body communication is a high frequency band centered on 10.7 MHz, it is desirable to set the 10.7 MHz band as the pass band for the bandpass filter 32. Since the human body communication transmitting unit 21a and the biological information receiving unit 22 share the first electrode 3, there is a possibility that a high-frequency transmission signal may circulate from the human body communication transmitting unit 21a to the biological information receiving unit 22, but the low-pass filter 23a. Can be prevented.

  In the present embodiment configured as described above, the apparatus main body 2 is attached to the human body M, and the first and second electrodes 3 and 4 are connected to the human body M in the same manner as the first embodiment. The ground electrode 5 is provided on the second side surface 2b opposite to the human body side so as to be separated from the human body M and capacitively coupled to the ground. The potential difference appearing at the first and second electrodes 3 and 4 is detected differentially by the differential amplifier 24, and biological information is input to the multiplexer 27 via the band elimination filter 25 and the analog-digital converter 26. The biological information selected by the multiplexer 27 is up-converted to the human body communication frequency band by the mixer 31, amplified by the amplifier 33, and sent from the first electrode 3 to the human body M. The first electrode 3 and the electrode 31 of the transceiver 30 are connected via the human body M, and a transmission signal transmitted from the first electrode 3 to the human body M (applied as an electric field) passes through the human body M. Thus, the change in the electric field is detected by the electrode 31 of the transceiver 30. Transmission data other than biological information is also sent from the first electrode 3 to the human body M and received by the transceiver 30 in the same manner as described above. In the transceiver 30, the terminal on the receiver side may be operated by the biometric information.

  Thus, according to the present embodiment, the biological information receiving unit 22 uses the first electrode 3 integrated with the second electrode 4 and the ground electrode 5 in the device main body 2 as a biological sensing electrode. On the other hand, since the human body communication transmitter 21a is used as an electrode for human body communication, the apparatus can be made compact.

  FIG. 7 shows a circuit configuration diagram of a partially modified human body communication transmitting unit and biometric information receiving unit in the second embodiment. The same parts as those of the human body communication transmitting unit 21a and the biological information receiving unit 22 shown in FIG. As shown in FIG. 7, the biometric information of the analog signal output from the band elimination filter 25 of the biometric information receiving unit 22 is directly input to the human body communication transmitting unit 21a without going through the analog-digital converter and the multiplexer. . The human body communication transmission unit 21a inputs an analog signal of biological information to the mixer 34, mixes it with the local oscillation signal input from the local oscillator 29, and up-converts it to a transmission frequency. The biological information of the up-converted analog signal is transmitted from the first electrode 3 to the human body M via the mixer 31 and the amplifier 33. On the other hand, the communication information of the original communication is digital data, modulated by the modulator 28 by a predetermined modulation method, mixed with the local oscillation signal input from the local oscillator 29, up-converted to the transmission frequency, and the first Are transmitted from the electrode 3 to the human body M.

  With the configuration as described above, the biological information of the analog signal measured by the biological information receiving unit 22 is directly input to the human body communication transmitting unit 21a as the analog signal so as to perform human body communication. It is also possible to perform human body communication of biological information with the timing at which the biological information is acquired as a trigger.

  Alternatively, the biometric information receiving unit 22 may be configured to trigger the timing at which the biometric information is acquired as a trigger to supply power to the human body communication transmitting unit 21a and transmit the biometric information to the transceiver 30 through human body communication. Compared with the case where power is always supplied to the human body communication transmitter 21a, power saving can be achieved.

  FIG. 14 shows a conceptual diagram in which electrocardiographic information is transmitted as biometric information from the human body communication transmitting unit 21a of the human body communication means 21 and the personal identification ID information of the subject (M) is transmitted. The electrocardiographic information of the human body M is measured by the biological information receiving unit 22 as a potential difference between the first and second electrodes 3 and 4 that are in contact with or capacitively coupled to the human body M. The electrocardiogram information is applied as an electric field from the first electrode 3 to the human body M from the human body communication transmitter 21a, and a transmission signal carrying the electrocardiogram information is detected by the transceiver 30. At this time, the ID information of the subject (M) is given as an electric field from the first electrode 3 to the human body M as one of the original communication information of the human body communication means 21 simultaneously with the electrocardiogram information or at different timings. A transmission signal carrying information is detected by the transceiver 30. If the electrocardiogram information is modulated using the ID information, the electrocardiogram information and the ID information can be transmitted simultaneously. As a result, data management in which the biometric information and the personal identification ID are linked can be performed in the transceiver 30 or a processing device thereafter.

  In the biological information measuring apparatus 20 according to the second embodiment, the human body communication means 21 of the device main body unit 2 includes a human body communication receiving unit, and the communication signal transmitted from the transceiver 30 attached to the arm unit is transmitted via the human body. You may be able to receive it.

  FIG. 8 is a block diagram in which the human body communication means 21 is provided with a human body communication receiving unit in the biological information measuring apparatus 20 according to the second embodiment. The human body communication means 21 includes a human body communication receiving unit 21b that receives a signal via the human body using the first electrode 3 that is an electrode for living body sensing. In addition, although illustration is abbreviate | omitted about the human body communication transmission part 21a, the human body communication transmission part 21a is provided. However, if the biological information measured by the biological information receiving unit 22 is not transmitted through human body communication, the human body communication transmitting unit 21a is not necessarily an essential requirement.

FIG. 9 is a circuit configuration diagram of the human body communication receiving unit 21 b and the biological information receiving unit 22.
The human body communication receiving unit 21b is connected to the first electrode 3, and inputs the received signal output from the first electrode 3 to the amplifier 41 to amplify it. A band pass filter 42 is connected to the output terminal of the amplifier 41. In the band pass filter 42, 10.7 MHz which is a frequency band used for human body communication is set as a pass band. Since the biological information detected by the first electrode 3 has a frequency (500 Hz or less) that is sufficiently lower than the frequency band used for human body communication (10.7 MHz), the bandpass filter 42 is used for the human body communication receiver 21b for biological information. Prevents leakage into A mixer 43 is connected to the output end of the band pass filter 42 and is mixed with the local oscillation signal supplied from the local oscillator 44 and down-converted. The down-converted received signal is demodulated by the demodulator 45.

  In this way, the human body communication receiving unit 21b can receive various information from the transceiver 30 using the first electrode 3 as the data communication electrode. The information received by the human body communication receiving unit 21b can include ID information related to the subject (human body M) wearing the biological information measuring device 20. The biological information measuring device 20 can associate the ID information received from the transceiver 30 with the measured biological information.

Next, a biological information measuring apparatus according to the third embodiment will be described.
In the third embodiment, not only the first electrode 3 but also the first electrode 3 and the second electrode 4 are used as the living body sensing electrode and the human body communication electrode.

FIG. 10 is a block diagram of a biological information measuring apparatus according to the third embodiment.
In the biological information measuring apparatus 50 according to the present embodiment, the arrangement of the first and second electrodes 3 and 4 and the ground electrode 5 is the same as the structure shown in FIGS. The second electrodes 3 and 4 are provided on the first side surface 2a of the device main body 2 and are in contact with or capacitively coupled to the human body M. The ground electrode 5 is separated from the human body M. It is provided on the opposite second side surface 2b and is capacitively coupled to the ground. The biological information measuring device 50 has a human body communication means 51 and a biological information receiving unit 52 built in the device main body 2. The human body communication means 51 includes a human body communication transmitter 51a.

  FIG. 11 shows a circuit configuration diagram of the human body communication transmitter 51a and the biological information receiver 52. Since the basic configuration is the same as that of the human body communication transmission unit 21a and the biological information reception unit 22 shown in FIG.

  In the present embodiment, two amplifiers 33a and 33b are connected in parallel to the output end of the bandpass filter 32 of the human body communication transmitter 51a. One amplifier 33 a is connected to the first electrode 3, and the other amplifier 33 b is connected to the second electrode 4. The biometric information measured by the biometric information receiving unit 22 is converted into biometric information of a digital signal by the analog / digital converter 26, and taken into the human body communication transmitting unit 51a via the multiplexer 27. Biological information, which is a digital signal, is modulated by the modulator 28, up-converted by the mixer 31, and then a high-frequency transmission signal composed of biological information extracted by the bandpass filter 32 is sent from one amplifier 33 a to the first electrode 3. In addition, it is applied to the second electrode 4 from the other amplifier 33b. A transmission signal, which is the same biological information, is applied to the human body M as an electric field from the first and second electrodes 3 and 4.

  Thus, by using the first and second electrodes 3 and 4 as human body communication electrodes, the entire electrode area can be expanded as compared with the case where only the first electrode 3 is used as a human body communication electrode. The transmission intensity can be increased, and the communication accuracy of human body communication can be improved.

  In the circuit configuration shown in FIG. 11, the biometric information of the analog signal measured by the biometric information receiving unit 52 is converted into a digital signal and input to the human body communication transmitting unit 51a via the multiplexer 27. Similarly to the circuit configuration shown in the figure, the biological information of the analog signal output from the band elimination filter 25 is directly input to the human body communication transmitting unit 51a, and the biological information is transmitted from the human body communication transmitting unit 51a as a trigger using the detection of the biological information. You may make it do.

  In the biological information measuring apparatus 50 according to the third embodiment, the human body communication means 21 of the device main body unit 2 includes a human body communication receiving unit, and the communication signal transmitted from the transceiver 30 attached to the arm unit is transmitted via the human body. You may be able to receive it.

  FIG. 12 is a block diagram in which the human body communication means 21 includes a human body communication receiving unit in the biological information measuring apparatus 50 according to the third embodiment. The human body communication means 51 includes a human body communication receiving unit 51b that receives signals via the human body using the first electrode 3 and the second electrode 4 that are electrodes for living body sensing. In addition, although illustration is abbreviate | omitted about the human body communication transmission part 51a, the human body communication transmission part 51a is provided. However, if the biological information measured by the biological information receiving unit 52 is not transmitted through human body communication, the human body communication transmitting unit 51a is not necessarily an essential requirement.

  FIG. 13 is a circuit configuration diagram of the human body communication receiving unit 51b and the biological information receiving unit 52. Since the basic configuration is the same as that of the human body communication receiving unit 21b and the biological information receiving unit 22 shown in FIG. 9, the same components are denoted by the same reference numerals to avoid redundant description.

  In the present embodiment, the first electrode 3 and the second electrode 4 are connected in parallel to the input end of the bandpass filter 42 via the corresponding amplifiers 41a and 41b. That is, at the time of human body communication, the transmission signal from the transceiver 30 is received by the two electrodes of the first electrode 3 and the second electrode 4, and the reception signals of the first electrode 3 and the second electrode 4 are respectively Synthesized.

  Thus, by using the first and second electrodes 3 and 4 as human body communication electrodes, the entire electrode area can be expanded as compared with the case where only the first electrode 3 is used as a human body communication electrode. , Reception sensitivity can be improved.

  The embodiment disclosed this time is illustrative in all respects and is not limited to this embodiment. The scope of the present invention is shown not by the above description of the embodiments but by the scope of the claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

  As described above, there is an effect that a ground electrode can be provided without causing an increase in mounting area, and in particular, biometric information measurement that measures a potential difference between two locations in a measurement target such as a human body as biometric information. Useful for equipment.

DESCRIPTION OF SYMBOLS 1, 20, 50 Biological information measuring device 2 Apparatus main-body part 2a 1st side surface 2b 2nd side surface 3 1st electrode 4 2nd electrode 5 Ground electrode 6 Wearing tool 10, 22, 52 Biological information receiving part 11 Difference Dynamic amplifier 12 Low-pass filter 13 Band elimination filter 21 Human body communication means 21a, 51a Human body communication transmitter

Claims (7)

First and second electrodes arranged to contact or capacitively couple to a living body;
A ground electrode capacitively coupled to the ground;
The second side surface in which the first electrode and the second electrode are provided apart from each other on the first side surface that becomes the living body side when the living body is worn, and is open to the space side on the opposite side to the living body side when the living body is worn. An apparatus main body provided with the ground electrode,
A biological information receiving unit that is built in the device main body, operates with the ground as a reference potential, and detects biological potential information by differentially detecting a potential difference between the first and second electrodes;
A biological information measuring device comprising: The device main body includes biological communication means for performing communication via a living body using at least the first electrode as a data communication electrode,
The biological information measuring apparatus according to claim 1, wherein the biological communication unit includes a transmission unit that transmits communication data from the data communication electrode via a living body.   The living body information measuring apparatus according to claim 2, wherein the living body communication means includes a receiving unit that receives and demodulates a signal transmitted to the living body by the data communication electrode.   The biological information measuring apparatus according to claim 2 or 3, wherein the biological communication means starts communication triggered by acquisition of the biological information by the biological information receiving unit.   The biological information measuring device according to any one of claims 1 to 4, wherein the biological information is electrocardiogram or myoelectricity.   3. The biometric communication means, wherein the biometric information acquired by the biometric information receiving unit and a personal identification ID of a biometric information measurement subject are signaled by the transmitting unit via a living body. The biological information measuring device according to claim 4.   The biological information measuring device according to any one of claims 2 to 6, wherein the biological information is transmitted from the transmission unit, and a terminal on the receiver side is operated by the biological information.

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