JP6659470B2 - Biological information measurement device - Google Patents

Description

  The present invention relates to a biological information measuring device that measures biological information of a driver holding a steering wheel of a vehicle.

  Conventionally, a total of eight electrodes are provided on each of two gripping portions on the left and right sides of the steering wheel that can be simultaneously gripped by the driver with the left and right hands. A biological information measuring device is known which measures the contact impedance of the electrode portions of the electrodes and sets the pair of left and right electrodes used for the measurement of the electrocardiographic waveform from the electrode portions whose measured contact impedance is equal to or less than the threshold value. (For example, see Patent Document 1).

JP 2008-237379 A

  By the way, in the biological information measuring device disclosed in Patent Literature 1, when measuring the impedance of the i-th electrode unit to be measured, the switching circuit unit is switched, and both electrodes of the i-th electrode unit are impedance-changed. Even after connecting to the measurement unit, it takes time for the detection signal from the impedance measurement unit to stabilize, so after the time required for the detection signal to stabilize after switching the switching circuit unit has passed, During the period, the detection signal is sampled, and the sampled detection signal is averaged, so that there is a problem that it takes time to measure the impedance and thus to measure the biological information. After the impedance measurement is performed for each of the eight electrode units, a pair of left and right electrode units are selected to measure the biological information. Therefore, it takes a considerable amount of time to complete the measurement of the biological information. become. Furthermore, if the time required for measurement is long, the contact state of the driver's hand may change between the time of impedance measurement and the time of biological information measurement, and there is a concern that measurement accuracy may be reduced. Shorter is more desirable.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a biological information measuring device capable of shortening a time required for measuring biological information and improving measurement accuracy. is there.

  In order to solve the above-described problem, the biological information measuring device of the present invention is disposed at a left position of a steering of a vehicle, a left electrode configured by a plurality of left divided electrodes, and disposed at a right position of the steering. A right electrode composed of right divided electrodes, a left potential difference detecting means for detecting a potential difference between the plurality of left divided electrodes, a right potential difference detecting means for detecting a potential difference between the plurality of right divided electrodes, a left divided electrode and a right divided Left and right potential difference detecting means for detecting a potential difference between the electrodes, and biological information calculating means for calculating biological information of a driver operating the steering based on the detection results of the left potential difference detecting means, the right potential difference detecting means and the left and right potential difference detecting means. And

  Since the biological information is measured based on the three types of potential differences detected at the same time (or a slight time difference may occur), the time required for measuring the biological information can be shortened. Further, by shortening the measurement time, it is possible to avoid a situation in which the contact state of the driver's hand changes during the measurement, and it is possible to improve the measurement accuracy of the biological information. Furthermore, by detecting the potential difference between the plurality of left divided electrodes and the potential difference between the plurality of right divided electrodes, it becomes possible to measure biological information reflecting the contact state of the left and right hands of the driver holding the steering wheel, Measurement accuracy of biological information can be further improved.

In addition, the above-described biological information calculation unit is configured to detect, based on each detection result of the left potential difference detection unit and the right potential difference detection unit, among the detection results of the left potential difference detection unit, the right potential difference detection unit, and the left and right potential difference detection unit, Select the detection result required for calculating the information.

  Specifically, the above-described biological information calculating means may detect the potential difference detected by the left and right potential difference detecting means when the potential differences detected by the left potential difference detecting means and the right potential difference detecting means are both smaller than a predetermined threshold. Is calculated based on the biological information.

  Further, the above-mentioned biological information calculating means, when the potential difference detected by the left potential difference detecting means is larger than a predetermined threshold value and the potential difference detected by the right potential difference detecting means is smaller than the threshold value, the left and right potential difference detecting means The biological information is calculated on the basis of the potential difference detected by the above-described method, or based on a value obtained by subtracting the potential difference detected by the left potential difference detecting means from the potential difference detected by the left and right potential difference detecting means.

  Further, the above-mentioned biological information calculating means, when the potential difference detected by the left potential difference detecting means is smaller than a predetermined threshold and the potential difference detected by the right potential difference detecting means is larger than the threshold, The biological information is calculated on the basis of the potential difference detected by the above-described method, or based on a value obtained by subtracting the potential difference detected by the right potential difference detecting means from the potential difference detected by the left and right potential difference detecting means.

  Further, the above-mentioned biological information calculating means, when the potential difference detected by the left potential difference detecting means is larger than a predetermined threshold, and when the potential difference detected by the right potential difference detecting means is larger than the threshold value, the left and right potential difference detecting means Based on the potential difference detected by the left and right potential difference detecting means, or based on the value obtained by subtracting the potential difference detected by the left potential difference detecting means from the potential difference detected by the left and right potential difference detecting means, or from the potential difference detected by the left and right potential difference detecting means. Based on a value obtained by subtracting the potential difference detected by the right potential difference detecting means, or based on a value obtained by subtracting each potential difference detected by the left potential difference detecting means and the right potential difference detecting means from the potential difference detected by the left and right potential difference detecting means. Then, the biological information is calculated.

  This makes it possible to detect an accurate potential difference between the left and right electrodes for each combination of the contact states of the left and right hands of the driver, and to measure biological information with high accuracy.

Further, when there are a plurality of potential difference candidates required for calculating the biological information, the above-described biological information calculating means calculates the biological information corresponding to each of the plurality of candidates, and obtains the biological information obtained by the calculation. , Biological information included in the normal range is selected. Thus, it is possible to eliminate the abnormal value of the biological information caused by the unstable hand contact state, and to measure the biological information with high accuracy.

  It is desirable that the above-mentioned biological information is an electrocardiogram signal or a heart rate. Thus, the driver's electrocardiogram signal and heart rate can be accurately measured.

It is a figure showing composition of a living body information measuring device of one embodiment. It is a figure showing the installation state of the left electrode and the right electrode. It is a figure which shows the ECG waveform as a potential difference between electrodes which appears when a left electrode and a right electrode are grasped firmly with right and left hands. FIG. 3 is a diagram showing one cycle of an ECG waveform. FIG. 14 is a diagram illustrating detection results of three potential difference detection units corresponding to a combination D. It is a figure showing the result of having computed potential difference VR1 _-L1 between left divided electrode EL1 and right divided electrode ER1 using each detection result of three potential difference detection parts corresponding to combination D. It is a flowchart which shows the operation | movement procedure of the biological information measuring device of this embodiment which measures an ECG waveform and a heart rate. It is a flowchart which shows the operation | movement procedure of the biological information measuring device of this embodiment which measures an ECG waveform and a heart rate. It is a flowchart which shows the operation | movement procedure of the biological information measuring device of this embodiment which measures an ECG waveform and a heart rate. It is a flowchart which shows the operation | movement procedure of the biological information measuring device of this embodiment which measures an ECG waveform and a heart rate. It is a flowchart which shows the operation | movement procedure of the biological information measuring device of this embodiment which measures an ECG waveform and a heart rate.

  Hereinafter, a biological information measuring device according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram illustrating a configuration of a biological information measurement device according to an embodiment. This biological information measuring device is mounted on a vehicle and measures biological information (electrocardiogram and heart rate) of a driver. As shown in FIG. 1, the biological information measuring device 100 of the present embodiment includes a left electrode 10, a right electrode 20, potential difference detectors 30, 32, 34, and a data processor 40.

  FIG. 2 is a diagram showing an installation state of the left electrode 10 and the right electrode 20. FIG. 2A illustrates a state where the steering 200 is viewed from the driver's seat side. FIG. 2B shows a state in which the steering 200 is viewed from the left side, and FIG. 2C shows a state in which the steering 200 is viewed from the right side.

  As shown in FIG. 2, the left electrode 10 is located on the left side of the ring portion 210 of the steering 200 in a range where the left hand may contact when the driver grips the steering 200 with both hands during traveling of the vehicle. Have been. The left electrode 10 is constituted by two left divided electrodes EL1 and EL2 extending in the circumferential direction of the wheel section 210. One left divided electrode EL1 is arranged on the driver's seat side, and the other left divided electrode EL2 is arranged on the opposite side of the driver's seat.

  Similarly, the right electrode 20 is located on the right side of the ring portion 210 of the steering 200 in a range where the right hand may contact when the driver grips the steering 200 with both hands during traveling of the vehicle. The right electrode 20 includes two right divided electrodes ER1 and ER2 extending in the circumferential direction of the wheel unit 210. One right divided electrode ER1 is arranged on the driver's seat side, and the other right divided electrode ER2 is arranged on the opposite side of the driver's seat.

Potential difference detection unit 30 is for detecting a potential difference corresponding to the left electrode 10, the potential of one of the left divided electrodes EL1 V _L1, the potential of the other of the left divided electrodes EL2 when the V _L2 , to detect these two left divided electrodes EL1, EL2 between the potential difference _{V L1-L2 (= V L1} -V L2).

The potential difference detection unit 32 is for detecting a potential difference corresponding to the right electrode 20. When the potential of one right divided electrode ER1 is V _R1 and the potential of the other right divided electrode ER2 is V _R2. , to detect the two right divided electrodes ER1, between ER2 potential difference _{V R2-R1 (= V R2} -V R1).

Potential difference detection unit 34 is for detecting the potential difference between the left electrode 10 and right electrode 20, the potential difference between the left divided electrode EL2 and the right divided electrodes _{ER2 V R2-L2 (= V} R2 - _VL2 ) is detected.

The data processing unit 40 generates an electrocardiogram (ECG: Electrocardiogram) as biological information based on the detection results (V _L1-L2 , V _R2-R1 , V _R2-L2 ) of the three potential difference detection units 30, 32, and. Calculate the signal and heart rate. To this end, the data processing unit 40 includes an ECG calculation unit 42, an RRI (RR interval) calculation unit 44, and a heart rate calculation unit 46.

  The ECG calculation unit 42 calculates an ECG signal (ECG waveform) as a potential difference between the left electrode 10 and the right electrode 20 using the detection results of the three potential difference detection units 30, 32, and 34.

  FIG. 3 is a diagram showing an ECG waveform as a potential difference between the electrodes that appears when the left electrode 10 and the right electrode 20 are firmly gripped by the left and right hands. FIG. 4 is a diagram showing one cycle of the ECG waveform.

In the present embodiment, two left divided electrodes EL1 and EL2 are provided as the left electrode 10 and two right divided electrodes ER1 and ER2 are provided as the right electrode 20. As the potential difference, there are four combinations A to D shown below.
(Combination A: potential difference _VR2-L2 between left divided electrode EL2 and right divided electrode ER2)
This potential difference is the potential difference _VR2-L2 itself detected by the potential difference detection unit 34.
(Combination B: potential difference _VR2-L1 between left divided electrode EL1 and right divided electrode ER2)
This potential difference can be obtained by subtracting the potential difference _VL1-L2 detected by the potential difference detecting unit 30 from the potential difference _VR2-L2 detected by the potential difference detecting unit 34.

_{V R2-L2 -V L1-L2} = (V R2 -V L2) - (V L1 -V L2)
_{= V R2 -V L2 -V L1 +} V L2
= V _R2 -V _L1
= V _R2-L1
(Combination C: potential difference VR1 _-L2 between left divided electrode EL2 and right divided electrode ER1)
This potential difference can be obtained by subtracting the potential difference _VR2-R1 detected by the potential difference detecting unit 32 from the potential difference _VR2-L2 detected by the potential difference detecting unit 34.

_{V R2-L2 -V R2-R1} = (V R2 -V L2) - (V R2 -V R1)
_{= V R2 -V L2 -V R2 +} V R1
= V _R1 -V _L2
= V _R1-L2
(Combination D: potential difference VR1 _-L1 between left divided electrode EL1 and right divided electrode ER1)
This potential difference can be obtained by subtracting each potential difference _VL1-L2 and potential difference _VR2-R1 detected by the potential difference detection units 30 and 32 from the potential difference _VR2-L2 detected by the potential difference detection unit 34.

_VR2-L2- ( _VL1-L2 + _VR2-R1 )
_{= (V R2 -V L2) -} ((V L1 -V L2) + (V R2 -V R1))
_{= V R2 -V L2 -V L1 +} V L2 -V R2 + V R1
= V _R1 -V _L1
= V _R1-L1
FIG. 5 is a diagram illustrating detection results of the three potential difference detection units 30, 32, and 34 corresponding to the combination D. In FIG. 5, the horizontal axis indicates elapsed time, and the vertical axis indicates voltage (potential difference).

FIG. 5A is a diagram illustrating a potential difference _VR2-L2 between the left divided electrode EL2 and the right divided electrode ER2 detected by the potential difference detecting unit 34. Combination D assumes a state in which the driver's hands stably contact the left divided electrode EL1 and the right divided electrode ER1, and the driver's both hands reliably contact the left divided electrode EL2 and the right divided electrode ER2. I haven't. Therefore, as shown in FIG. 5A, the waveform is disturbed.

FIG. 5B is a diagram illustrating a potential difference VL1 _-L2 between the left divided electrodes EL1 and EL2 detected by the potential difference detection unit 30. The left hand is stably in contact with one left electrode voltage EL1, but is not reliably in contact with the other left electrode voltage EL2. Therefore, as shown in FIG. 5B, the potential difference between them does not become smaller than the predetermined threshold.

FIG. 5C is a diagram illustrating a potential difference VR2 _-R1 between the right divided electrodes ER1 and ER2 detected by the potential difference detection unit 32. The right hand is stably in contact with one left electrode voltage ER1, but is not reliably in contact with the other left electrode voltage ER2. Therefore, as shown in FIG. 5C, the potential difference between them does not become smaller than the predetermined threshold.

FIG. 6 shows a result of calculating a potential difference V _R1-L1 between the left divided electrode EL1 and the right divided electrode ER1 using the detection results of the three potential difference detection units 30, 32, and 34 corresponding to the combination D. FIG. By subtracting each potential difference V _L1-L2 and potential difference V _R2-R1 detected by the potential difference detection units 30 and 32 from the potential difference V _R2-L2 shown in FIG. 5 (A), a stable state as shown in FIG. 6 is obtained. An ECG waveform is obtained.

  The ECG calculation unit 42 calculates the potential difference of each of the above four combinations A to D in order or in parallel. In the present embodiment, the heart rate is calculated sequentially or in parallel in the heart rate calculator 46 described later using the potential difference of each of the four combinations A to D.

  The RRI calculator 44 calculates an RRI that is a time difference between two adjacent R waves in the ECG waveform calculated by the ECG calculator 42. Specifically, the RRI calculator 44 calculates the RRI, which is the peak interval of the R wave shown in FIG. 4, from the ECG waveform shown in FIG. For example, the RRIs for a predetermined period are averaged and output from the RRI calculator 44.

  The heart rate calculator 46 calculates a heart rate based on the RRI calculated by the RRI calculator 44 using the following equation.

Heart rate (bpm) = 60000 / RRI (msec)
The above-described potential difference detection unit 30 corresponds to left potential difference detection means, the potential difference detection unit 32 corresponds to right potential difference detection means, the potential difference detection unit 34 corresponds to left and right potential difference detection means, and the data processing unit 40 corresponds to biological information calculation means.

The biological information measuring device 100 of the present embodiment has such a configuration, and the operation will be described next. When calculating the ECG waveform as the biological information, any of the above-described combinations A to D is used. In the present embodiment, the movement (operation content) of the driver's left and right hands is predicted. , The combination to be used is selected. Specifically, hand movements shown in the following cases 1 to 4 are assumed.
(Case 1: Both hands of driver hold steering wheel 200 firmly)
In this state, both the potential difference _VL1-L2 detected by the potential difference detecting section 30 and the potential difference _VR2-R1 detected by the potential difference detecting section 32 become smaller than a predetermined threshold. In this case 1, the combination A described above is used as the potential difference between the left electrode 10 and the right electrode 20.
(Case 2: The driver is performing some operation (for example, operating a wiper) with his left hand)
In this state, the potential difference _VL1-L2 detected by the potential difference detecting section 30 becomes larger than a predetermined threshold, and the potential difference _VR2-R1 detected by the potential difference detecting section 32 becomes smaller than the predetermined threshold. In this case 2, the combination B or A described above is used as the potential difference between the left electrode 10 and the right electrode 20.
(Case 3: The driver is performing some operation (for example, operating a turn signal) with the right hand)
In this state, the potential difference _VL1-L2 detected by the potential difference detecting section 30 becomes smaller than a predetermined threshold, and the potential difference _VR2-R1 detected by the potential difference detecting section 32 becomes larger than the predetermined threshold. In this case 3, the combination C or A described above is used as the potential difference between the left electrode 10 and the right electrode 20.
(Case 4: The driver is performing some operation (for example, operating a wiper) with each of the right hand and the left hand)
In this state, both the potential difference _VL1-L2 detected by the potential difference detecting section 30 and the potential difference _VR2-R1 detected by the potential difference detecting section 32 become larger than a predetermined threshold. In this case 4, any of the combinations A to D described above is used as the potential difference between the left electrode 10 and the right electrode 20.

  7 to 11 are flowcharts showing the operation procedure of the biological information measuring device 100 of the present embodiment for measuring an ECG waveform and a heart rate.

  First, the ECG calculation unit 42, the RRI calculation unit 44, and the heart rate calculation unit 46 calculate the ECG, the RRI, and the heart rate using the potential differences corresponding to each of the above-described combinations A to D (step 100).

Next, the heart rate calculating unit 46 determines whether or not the above case 1 is satisfied (both the potential difference _VL1-L2 detected by the potential difference detecting unit 30 and the potential difference _VR2-R1 detected by the potential difference detecting unit 32). Is smaller than a predetermined threshold value) (step 102). If so, a positive determination is made. In this case, the heart rate calculation unit 46 determines that the left and right hands of the driver are in contact with all of the left divided electrodes EL1, EL2 and the right divided electrodes ER1, ER2 (step 104), and the combination A Is adopted (step 106). Note that the determination operations of step 104, 112, and the like, which will be described later, are added for easy understanding, but may be omitted because they are not related to the actual operations. The determination operation in step 102 may be performed by providing the ECG calculation unit 42, the RRI calculation unit 44, or another control unit instead of the heart rate calculation unit 46.

If the case does not correspond to the case 1, a negative judgment is made in the judgment of the step 102. Next, the heart rate calculator 46 determines whether or not the above case 2 is satisfied (the potential difference _VL1-L2 detected by the potential difference detector 30 is larger than a predetermined threshold and the potential difference detector 32 detects It is determined whether or not the potential difference _VR2-R1 is smaller than a predetermined threshold value (step 108). If so, a positive determination is made. In this case, the heart rate calculation unit 46 determines whether the heart rate corresponding to the combination A described above is included in the normal range (Step 110). If it is included, an affirmative determination is made, and the heart rate calculation unit 46 determines that the left and right hands of the driver are stably contacting the left divided electrode EL2 and the right divided electrodes ER1, ER2 (step). 112), the ECG and the heart rate corresponding to the combination A are adopted (step 114).

  If the heart rate corresponding to the combination A is not included in the normal range and a negative determination is made in the determination at step 110, the heart rate calculation unit 46 then determines that the heart rate corresponding to the combination B is normal. It is determined whether it is included in the range (step 116). If it is included, an affirmative determination is made, and the heart rate calculation unit 46 determines that the left and right hands of the driver are stably contacting the left divided electrode EL1 and the right divided electrodes ER1 and ER2 (step). 118), the ECG and the heart rate corresponding to the combination B are adopted (step 120).

  If the heart rate corresponding to the combination B is not included in the normal range and a negative determination is made in the determination in step 116, the heart rate calculation unit 46 then transmits the driver's heart rate only to the right split electrodes ER1 and ER2. It is determined that the right hand is in stable contact and the left hand is not properly in contact with either of the left divided electrodes EL1 and EL2 (step 122), and it is determined that the ECG and heart rate cannot be calculated (step 124). .

If the case does not correspond to Case 2, a negative determination is made in the determination at Step 108. Next, the heart rate calculating unit 46 determines whether or not the above case 3 is satisfied (the potential difference _VL1-L2 detected by the potential difference detecting unit 30 is smaller than a predetermined threshold and the potential difference detecting unit 32 detects It is determined whether or not the potential difference _VR2-R1 is larger than a predetermined threshold value (step 126). If so, a positive determination is made. In this case, the heart rate calculation unit 46 determines whether the heart rate corresponding to the combination A described above is included in the normal range (step 128). If it is included, an affirmative determination is made, and the heart rate calculation unit 46 determines that the left and right hands of the driver are stably in contact with the left divided electrodes EL1, EL2 and the right divided electrode ER2 (step). 130), the ECG and heart rate corresponding to combination A are adopted (step 132).

  If the heart rate corresponding to the combination A is not included in the normal range and a negative determination is made in the determination at step 128, the heart rate calculation unit 46 then determines that the heart rate corresponding to the combination C is normal. It is determined whether or not it is included in the range (step 134). If it is included, an affirmative determination is made, and the heart rate calculation unit 46 determines that the left and right hands of the driver are stably in contact with the left divided electrodes EL1, EL2 and the right divided electrode ER1 (step). 136), the ECG and the heart rate corresponding to the combination C are adopted (step 138).

  If the heart rate corresponding to the combination C is not included in the normal range and a negative determination is made in the determination in step 134, then the heart rate calculation unit 46 applies only the left divided electrodes EL1 and EL2 to the driver. It is determined that the left hand is stably in contact and the right hand is not properly in contact with either of the right split electrodes ER1 and ER2 (step 140), and it is determined that the ECG and the heart rate cannot be calculated (step 142). .

  If it does not correspond to Case 3, a negative determination is made in the determination at Step 126. This corresponds to Case 4, and next, the heart rate calculation unit 46 determines whether the heart rate corresponding to the above-described combination A is within the normal range (Step 144). If it is included, a positive determination is made, and the heart rate calculation unit 46 determines that the left and right hands of the driver are stably contacting the left divided electrode EL2 and the right divided electrode ER2 (step 146). The ECG and the heart rate corresponding to the combination A are adopted (step 148).

  If the heart rate corresponding to the combination A is not included in the normal range and a negative determination is made in the determination in step 144, then the heart rate calculation unit 46 determines that the heart rate corresponding to the combination B is normal. It is determined whether it is included in the range (step 150). If it is included, an affirmative determination is made, and the heart rate calculator 46 determines that the left and right hands of the driver are stably contacting the left divided electrode EL1 and the right divided electrode ER2 (step 152). The ECG and the heart rate corresponding to the combination B are adopted (step 154).

  If the heart rate corresponding to the combination C is not included in the normal range and a negative determination is made in the determination in step 150, the heart rate calculating unit 46 next determines that the heart rate corresponding to the combination C is normal. It is determined whether it is included in the range (step 156). If it is included, an affirmative determination is made, and the heart rate calculator 46 determines that the left and right hands of the driver are stably contacting the left divided electrode EL2 and the right divided electrode ER1 (step 158). The ECG and the heart rate corresponding to the combination C are adopted (step 160).

  If the heart rate corresponding to the combination C is not included in the normal range and a negative determination is made in the determination in step 156, the heart rate calculating unit 46 then determines that the heart rate corresponding to the combination D is normal. It is determined whether it is included in the range (step 162). If it is included, an affirmative determination is made, and the heart rate calculator 46 determines that the left and right hands of the driver are stably contacting the left divided electrode EL1 and the right divided electrode ER1 (step 164). The ECG and the heart rate corresponding to the combination D are adopted (step 166).

  If the heart rate corresponding to the combination D is not included in the normal range and a negative determination is made in the determination in step 162, then the heart rate calculation unit 46 determines that the contact of both hands with the necessary electrodes is insufficient. (Either the left hand is not exactly in contact with any of the left divided electrodes EL1 and EL2, and the left hand is not in contact with any of the right divided electrodes ER1 and ER2, or one or both hands are left electrode 10 or Is determined (step 168), and it is determined that the ECG and the heart rate cannot be calculated (step 170).

As described above, in the biological information measuring apparatus 100 of the present embodiment, the three types of potential differences V _R2-L2 , V _L1-L2 , and V _R2-R1 detected simultaneously (or a slight time difference may occur) are obtained. Since the biological information is measured based on the information, the time required for measuring the biological information can be shortened. Further, by shortening the measurement time, it is possible to avoid a situation in which the contact state of the driver's hand changes during the measurement, and it is possible to improve the measurement accuracy of the biological information. Furthermore, by detecting the potential difference VL1 _-L2 between the two left divided electrodes EL1 and EL2 and the potential difference VR2 _-R1 between the two right divided electrodes ER1 and ER2, the contact state of the left and right hands of the driver holding the steering wheel 200 is detected. The measurement of the biological information reflecting the information can be performed, and the measurement accuracy of the biological information can be further improved.

  In addition, by assuming a combination of the contact states of the driver's left and right hands as shown in cases 1 to 4 above, an accurate potential difference between the left and right electrodes is detected for each of these cases, thereby achieving a highly accurate living body. Information can be measured.

  Further, in cases 2 to 4 described above, a plurality of selection candidates are extracted from the combinations A to D, and a selection in which the biological information (heart rate) is included in the normal range is selected from among them. It is possible to remove the abnormal value of the biological information caused by the contact state of the hand and measure the biological information with high accuracy.

  Note that the present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. For example, in the above-described embodiment, the driver's drowsiness, the degree of stress, the degree of comfort, and the like may be measured as biological information based on the ECG and the heart rate.

  Further, in the above-described embodiment, the left electrode 10 is constituted by the two left divided electrodes EL1 and EL2, and the right electrode 20 is constituted by the two right divided electrodes ER1 and ER2. However, the number of the divided electrodes is three or more. You may.

  As described above, according to the present invention, the biological information is measured based on the three types of potential differences detected simultaneously (or a slight time difference may occur). Can be shortened. Further, by shortening the measurement time, it is possible to avoid a situation in which the contact state of the driver's hand changes during the measurement, and it is possible to improve the measurement accuracy of the biological information. Furthermore, by detecting the potential difference between the plurality of left divided electrodes and the potential difference between the plurality of right divided electrodes, it becomes possible to measure biological information reflecting the contact state of the left and right hands of the driver holding the steering wheel, Measurement accuracy of biological information can be further improved.

DESCRIPTION OF SYMBOLS 10 Left electrode 20 Right electrode 30, 32, 34 Potential difference detection part 40 Data processing part 42 ECG calculation part 44 RRI calculation part 46 Heart rate calculation part 100 Biological information measuring device 200 Steering 210 Ring part EL1, EL2 Left split electrode ER1, ER2 Right split electrode

Claims (4)

A left electrode disposed at the left position of the steering of the vehicle and configured by a plurality of left divided electrodes;
A right electrode disposed at the right position of the steering wheel and configured by a plurality of right divided electrodes;
Left potential difference detecting means for detecting a potential difference between the plurality of left divided electrodes,
Right potential difference detecting means for detecting a potential difference between the plurality of right divided electrodes,
Left and right potential difference detecting means for detecting a potential difference between the left divided electrode and the right divided electrode,
Based on each detection result of the left potential difference detection means, the right potential difference detection means and the left and right potential difference detection means, biological information calculation means for calculating biological information of the driver operating the steering,
Wherein the biological information calculation means includes, from among the detection results of the left potential difference detection means, the right potential difference detection means, and the left and right potential difference detection means, the detection results of the left potential difference detection means and the right potential difference detection means. Based on the selected detection result required to calculate the biological information,
The biological information calculation means, based on the potential difference detected by the left and right potential difference detection means, when the potential difference detected by each of the left potential difference detection means and the right potential difference detection means is both smaller than a predetermined threshold value Calculating the biological information,
The biological information calculation unit is configured to detect the left and right potential difference when the potential difference detected by the left potential difference detection unit is larger than a predetermined threshold and the potential difference detected by the right potential difference detection unit is smaller than the threshold. Based on the potential difference detected by the means, or, based on the value obtained by subtracting the potential difference detected by the left potential difference detection means from the potential difference detected by the left and right potential difference detection means, to calculate the biological information,
The biological information calculation unit may detect the left and right potential difference when the potential difference detected by the left potential difference detection unit is smaller than a predetermined threshold and the potential difference detected by the right potential difference detection unit is larger than the threshold. Based on the potential difference detected by the means, or, based on a value obtained by subtracting the potential difference detected by the right potential difference detection means from the potential difference detected by the left and right potential difference detection means, to calculate the biological information ,
When there are a plurality of potential difference candidates necessary for the calculation of the biometric information, the biometric information calculation means calculates biometric information corresponding to each of the plurality of candidates, and among the biometric information obtained by the calculation, A biological information included in a normal range from the biological information. In claim 1,
The biological information calculation unit may detect the left and right potential difference when the potential difference detected by the left potential difference detection unit is greater than a predetermined threshold and the potential difference detected by the right potential difference detection unit is greater than the threshold. The potential difference detected by the left and right potential difference detecting means, or the potential difference detected by the left and right potential difference detecting means from the potential difference detected by the left and right potential difference detecting means. The potential difference detected by the left potential difference detecting means and the right potential difference detecting means is determined based on a value obtained by subtracting the potential difference detected by the right potential difference detecting means from the obtained potential difference, or from the potential difference detected by the left and right potential difference detecting means. Based on the value obtained by subtracting each potential difference Calculating biological information measuring device, characterized by. In claim 1 or 2 ,
The biological information measuring device is characterized in that the biological information is an electrocardiogram signal. In claim 1 or 2 ,
The biological information measuring device, wherein the biological information is a heart rate.

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