JP2014171513A - Biological information detecting apparatus and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a biological information detecting apparatus and a program in which a user can easily compare and browse a plurality of measurement results by displaying the measurement results of pulse wave information in a plurality of pressing states.SOLUTION: A biological information detecting apparatus has: a pulse wave information detecting section 10 which detects pulse wave information on a test subject; a processing section 100 which performs measurement processing at a level of the pulse wave information when pressure to the test subject in the pulse wave information detecting section is in each pressing state of a first pressing state to the N-th (N represents the integer of 2 or more) pressing state; and a display section 70 which displays measurement results of a first measurement result to the M-th (M represents the integer which satisfies M≤N) result, in the result of the measurement processing at the level of the pulse wave information in the first pressing state to the Nth pressing state.

Description

  The present invention relates to a biological information detection apparatus, a program, and the like.

  Conventionally, electronic devices such as a biological information detection device (pulse meter in a narrow sense) have been widely used. A pulse meter is a device for detecting a pulsation derived from the heartbeat of a human body, for example, a signal derived from a heartbeat based on a signal from a pulse wave sensor attached to an arm, palm, finger, etc. Is a device for detecting

  For example, a photoelectric sensor is used as the pulse wave sensor. In this case, a method of detecting reflected light or transmitted light of the light irradiated on the living body with the photoelectric sensor can be considered. Depending on the blood flow in the blood vessel, the amount of light absorbed and reflected by the living body differs, so the sensor information (pulse wave sensor signal) detected by the photoelectric sensor is a signal corresponding to the blood flow, etc. By analyzing the signal, it is possible to obtain information on the beat.

  However, it is known that the amplitude of the pulse signal varies depending on the pressure. An excessive press or an excessive press lowers the pulse signal. Therefore, in order to accurately perform processing based on the pulse signal (for example, calculation of pulsation information), it is necessary to set an appropriate press.

  For example, Patent Document 1 presents a structure that can measure the contact pressure of a biological information detection unit that detects biological information such as a pulse meter. In addition, a method of notifying the user by determining whether or not the contact pressure is an appropriate pressure and displaying the pressure in a graph is also presented.

JP 2008-54890 A

  The vital signs such as the pulse are extremely different from person to person. Therefore, the value of the appropriate pressure is different for each user. On the other hand, the technique of Patent Document 1 is physical information such as simple pressure (for example, physical quantity expressed in units of kPa or the like). However, it is not possible to reliably determine whether or not the processing is appropriate because individual differences are not considered. For example, even if the measured pressure is included in the appropriate pressing range set as a general value, if the actual pulse signal is too small, it cannot be said that the pressing is an appropriate value for the user concerned.

  As a response to the above problem, it is conceivable to actually perform pulse wave information measurement processing in a plurality of pressed states and use the results of the measurement processing. By doing so, since the result of the measurement process reflects the personal characteristics of the user who is the subject, it is possible to realize an appropriate pressing state in consideration of individual differences.

  However, when measurement is performed in a plurality of pressed states, it takes a certain amount of time, including stabilization of the user's posture and actual measurement processing (signal processing for pulse wave information), which gives stress to the user. . Therefore, it is necessary to alleviate stress.

  A method for displaying the measurement results in a plurality of pressed states can be considered as a technique for the above-described problem. By presenting how much the measurement process is progressing, user stress can be alleviated, and user operations according to the measurement results (for example, the measurement process can be terminated halfway because sufficient values were obtained) are also possible Because it becomes.

  According to some aspects of the present invention, a biological information detection device, a program, and the like that make it easy for a user to compare and view a plurality of measurement results by displaying the measurement results of pulse wave information in a plurality of pressed states. Can be provided.

  In one embodiment of the present invention, a pulse wave information detection unit that detects pulse wave information of a subject, and the pulse wave information detection unit is pressed against the subject from a first pressed state to an Nth (N is 2). A processing unit that performs a measurement process of the level of the pulse wave information when each of the pressed states is an integer of the above), and the pulse wave information of the first to Nth pressed states. Of the results of the measurement process at the level, the display unit displays a measurement result of a first measurement result to an Mth measurement result (M is an integer satisfying M ≦ N).

  In one embodiment of the present invention, a plurality of measurement results corresponding to a plurality of pressed states are displayed. Therefore, when the pressing state is switched due to various factors such as determination of proper pressing, it is possible to present the results to the user in a format that is easy to compare and browse.

  In the aspect of the invention, the display unit may display the first measurement result to the Mth measurement result on which the level normalization processing of the pulse wave information has been performed.

  As a result, the level normalization process is performed, so that the displayable range and the actual measurement result can be appropriately displayed in association with each other.

  In the aspect of the invention, the display unit may be configured to perform the first measurement in which the normalization process is performed based on a maximum value of the level among the first measurement result to the Mth measurement result. Results to the Mth measurement result may be displayed.

  As a result, any of the plurality of measurement results to be displayed is prevented from exceeding the displayable upper limit value, and can be displayed appropriately.

  In one embodiment of the present invention, the result of the measurement process of the level of the pulse wave information in the first to i-th (i is an integer satisfying 2 ≦ i ≦ N) is acquired. When the result of the measurement process of the level of the pulse wave information in the i + 1th pressed state to the Nth pressed state is not acquired, the display unit is configured to display the first pressed state to the The normalization process according to the maximum value of the level among the measurement results of the first to jth (j is an integer satisfying j ≦ i) included in the measurement process result in the i-th pressed state. And the first measurement result to the jth measurement result on which the normalization processing has been performed may be displayed.

  Thereby, even when the measurement results are acquired only in some of the plurality of pressed states, it is possible to appropriately display the acquired measurement results.

  In one aspect of the present invention, the display unit displays an instruction screen for instructing to change the pressed state to the i + 1th pressed state, and the processing unit displays the instruction screen in the i + 1th pressed state. When the measurement process of the level of the pulse wave information is started, the display unit, together with the first measurement result to the jth measurement result, in the i + 1th pressed state during the measurement process. A temporary measurement result of the level of the pulse wave information may be displayed.

  Thereby, in addition to the acquired measurement result, it is possible to display the provisional value of the pulse wave information currently being measured.

  Moreover, in one aspect of the present invention, the display unit may perform an animation display that varies corresponding to the variation of the pulse wave information in the i + 1th pressed state, as the display of the provisional measurement result.

  This makes it possible to display the provisional measurement result according to the actually acquired pulse wave information.

  In the aspect of the invention, the processing unit may perform the measurement processing of the pulse wave information when the posture state of the subject is in each of the first pressed state to the Nth pressed state. A determination process for determining whether the posture to be performed is appropriate is performed, and the display unit dynamically changes according to a change in the posture state in each of the first pressed state to the Nth pressed state. The changing posture state notification image may be displayed.

  This notifies the user of the current posture state in an intuitively understandable format, making it easy to take an appropriate posture state and further improving the processing accuracy by performing measurement processing in an appropriate posture state. It becomes possible to make it.

  In the aspect of the invention, the display unit may display, as the posture state notification image, an image in which a display position of an object representing the posture state changes according to the posture state.

  As a result, the posture state can be displayed in association with the display position of the object.

  In one embodiment of the present invention, the result of the measurement process in the first pressed state to the i-th pressed state (i is an integer satisfying 2 ≦ i ≦ N) is acquired, and the i + 1th pressed state is The measurement processing result of the level of the pulse wave information in the Nth pressed state has not been acquired, and in the i + 1th pressed state, the posture state is determined to be appropriate. In this case, the processing unit starts the measurement process of the level of the pulse wave information in the i + 1th pressed state, and the display unit performs the first pressed state to the ith pressed state. The first measurement result to the jth measurement result included in the result of the measurement process at the level of the pulse wave information at, and the pulse wave information in the i + 1th pressed state during the measurement process. You may display the temporary measurement result of the said level.

  This makes it possible to perform measurement processing after determining whether the posture state is appropriate in a given pressing state.

  In one aspect of the present invention, in the i + 1th pressed state, when the processing unit determines that the posture state is appropriate, the display unit corresponds to a state where the posture state is appropriate. An image in which the object is displayed may be continuously displayed as the posture state notification image for a given wait time in a first area in the image to be displayed.

  As a result, whether or not the posture state is appropriate is determined depending on whether or not the display position of the object is in the first region, and it is clearly shown that the current posture state is appropriate by providing a wait time. It is possible to notify the user.

  In the aspect of the invention, the display unit may display the first measurement result to the jth measurement result and the temporary measurement result in the i + 1th pressed state after the wait time has elapsed. May be.

  This makes it possible to display a corresponding image during the measurement process.

  In the aspect of the invention, when the processing unit acquires the result of the measurement process in the i + 1th pressed state, the display unit changes the pressed state to the i + 2 pressed state. An instruction screen for instructing to perform the display, and when the pressing state is changed to the i + 2 pressing state according to the instruction screen, the display unit displays the posture state notification image in the i + 2 pressing state. May be displayed.

  Thereby, after completion of the measurement process in a given pressing state, a transition to another pressing state can be promoted, measurement results in a plurality of pressing states can be obtained, and each pressing state It is possible to present the result of determination processing of the posture state at the user to the user using the posture state notification image.

  Moreover, in one aspect of the present invention, the processing unit obtains the result of the measurement processing of the pulse information obtained in at least two pressing states among the first pressing state to the Nth pressing state. Based on this, an appropriate pressing information acquisition process for obtaining appropriate pressing information indicating an appropriate value of the pressing with respect to the subject may be performed.

  This makes it possible to obtain an appropriate pressure with a large individual difference from the measurement result of the pulse wave information.

  In the aspect of the invention, the first measurement result to the Mth measurement result may be obtained by measuring the level of the pulse wave information in the first pressed state to the Nth pressed state. Among these results, at least the measurement result with the maximum level may be included.

  This makes it possible to display the measurement result having the maximum level among the plurality of measurement results.

  According to another aspect of the present invention, the pulse wave information acquisition unit that acquires the pulse wave information of the subject, and the pulse wave information detection unit is pressed against the subject from the first pressed state to the Nth ( N is an integer equal to or greater than 2) a processing unit that performs a measurement process of the level of the pulse wave information when each of the pressed states is pressed, and the pulse in the first to Nth pressed states Among the results of the measurement processing of the level of wave information, as a display control unit that performs control to display the measurement results of the first measurement result to the Mth (M is an integer satisfying M ≦ N) on the display unit, Related to programs that make computers work.

The basic structural example of the biometric information detection apparatus of this embodiment. The structural example of the body movement noise reduction part using an adaptive filter. 3A to 3C show examples of a pulse wave detection signal, a body motion detection signal, and a waveform and a frequency spectrum of a signal after body motion noise reduction processing based on the pulse wave detection signal and the body motion detection signal. 4A and 4B are examples of a biological information detection apparatus. The detailed structural example of the biometric information detection apparatus of this embodiment. FIG. 5 is a relationship diagram of pressing and a pulse wave detection signal (AC component signal). The structural example of a biometric information detection apparatus. The top view which shows the expansion | extension state of an expansion-contraction part. The top view which shows the twisted state of an expansion-contraction part. The perspective view which shows a connection member. The perspective view which shows a connection member. The disassembled perspective view which shows a connection member. The other perspective view which shows a connection member. FIGS. 14A to 14C are diagrams showing a structure example of a positioning piece and a moving state. 15A and 15B are structural examples of the pulse wave information detection unit. An example of a system configuration when processing is performed in another electronic device or the like. 17A and 17B show examples of posture state notification images. 18A to 18C are explanatory diagrams of a coordinate system and an angle used in the posture state determination process. 19A and 19B are diagrams illustrating an appropriate posture state. 20A to 20E are examples of normalized graphs (measurement state notification images). An example of a measurement state notification image including a provisional result. The example of the instruction | indication screen which instruct | indicates the change of a load state. The example of the image which notifies the result of a measurement process. The example of a screen transition of the display image in a display part. FIG. 25A and FIG. 25B are relationship diagrams between the pressure and the AC component signal. FIG. 26A shows an example of the signal value of the AC component signal at a given pressure, and FIG. 26B shows an example of the amplitude value of the AC component signal at the given pressure. The flowchart explaining the process of this embodiment. The flowchart explaining the calculation process of a pulse amplitude value.

  Hereinafter, this embodiment will be described. In addition, this embodiment demonstrated below does not unduly limit the content of this invention described in the claim. In addition, all the configurations described in the present embodiment are not necessarily essential configuration requirements of the present invention.

1. Configuration Example of Biological Information Detection Device First, a basic configuration example of the biological information detection device (electronic device in a broad sense) of the present embodiment will be described with reference to FIG. FIG. 1 shows an example of a biological information detection device. The configuration included in the biological information detection device of this embodiment may be simplified or omitted, or the biological information detection device of this embodiment. In some cases, a configuration that is not essential is included.

  As shown in FIG. 1, the biological information detection apparatus of the present embodiment includes a pulse wave information detection unit 10, a body motion information detection unit 20, a processing unit 100, and a display unit 70. However, the biological information detection apparatus is not limited to the configuration in FIG. 1, and various modifications such as omission / change of some of these components or addition of other components are possible.

  The pulse wave information detection unit 10 outputs a signal based on sensor information (pulse wave sensor signal, pulse wave information) of the pulse wave sensor. The pulse wave information detection unit 10 can include, for example, a pulse wave sensor 11, a filter processing unit 15, and an A / D conversion unit 16. However, the pulse wave information detection unit 10 is not limited to the configuration in FIG. 1, and various components such as omitting some of these components or adding other components (for example, an amplification unit that amplifies a signal, etc.) are included. Can be implemented.

  The pulse wave sensor 11 is a sensor for detecting a pulse wave signal. For example, a photoelectric sensor can be considered. In addition, when using a photoelectric sensor as the pulse wave sensor 11, you may use the sensor comprised so that the signal component of external lights, such as sunlight, may be cut. This can be realized by, for example, a configuration in which a plurality of photodiodes are provided and difference information is obtained by feedback processing using these signals.

  The pulse wave sensor 11 is not limited to a photoelectric sensor, and may be a sensor using ultrasonic waves. In this case, the pulse wave sensor 11 has two piezoelectric elements. One of the piezoelectric elements is excited to transmit an ultrasonic wave into the living body, and the ultrasonic wave reflected by the blood flow of the living body is transmitted to the other. Received by the piezoelectric element. Since the frequency change occurs in the transmitted ultrasound and the received ultrasound due to the Doppler effect of blood flow, a signal corresponding to the blood flow can be obtained in this case as well, and pulsation information can be estimated. . Other sensors may be used as the pulse wave sensor 11.

  The filter processing unit 15 performs high-pass filter processing on the sensor information from the pulse wave sensor 11. Note that the cutoff frequency of the high-pass filter may be obtained from a typical pulse rate. For example, there are very few cases where the pulse rate of a normal person falls below 30 times per minute. In other words, since the frequency of the signal derived from the heartbeat is rarely 0.5 Hz or less, even if the information of the frequency band in this range is cut, the adverse effect on the signal to be acquired should be small. Therefore, about 0.5 Hz may be set as the cutoff frequency. Further, depending on the situation, a different cutoff frequency such as 1 Hz may be set. Furthermore, since it is possible to assume a typical upper limit value for the human pulse rate, the filter processing unit 15 may perform bandpass filter processing instead of high-pass filter processing. The cutoff frequency on the high frequency side can be set freely to some extent, but a value such as 4 Hz may be used.

  The A / D converter 16 performs A / D conversion processing and outputs a digital signal. The process in the filter processing unit 15 described above may be an analog filter process performed before the A / D conversion process, or a digital filter process performed after the A / D conversion process. .

  The body motion information detection unit 20 outputs a signal (body motion detection signal) corresponding to the body motion based on sensor information of various sensors. The body motion information detection unit 20 can include, for example, an acceleration sensor 21, a pressure sensor 22, and an A / D conversion unit 26. However, the body motion information detection unit 20 may include other sensors (for example, a gyro sensor), an amplification unit that amplifies a signal, and the like. Further, it is not necessary to provide a plurality of types of sensors, and a configuration including one type of sensor may be used.

  The processing unit 100 includes a signal processing unit 110 and a pulsation information calculation unit 120. However, the processing unit 100 is not limited to the configuration in FIG. 1, and various modifications such as omitting some of these components or adding other components are possible. The signal processing unit 110 performs signal processing on the output signal from the pulse wave information detection unit and the output signal from the body motion information detection unit.

  The signal processing unit 110 can include a pulse wave signal processing unit 111, a body motion signal processing unit 113, and a body motion noise reduction unit 115.

  The pulse wave signal processing unit 111 performs some signal processing on the signal from the pulse wave information detection unit 10. As the output from the pulse wave information detection unit 10 shown by S1 in FIG. 1, various signals based on the pulse wave sensor signal can be considered. For example, the calculation of pulsation information, which will be described later, is applied to a pulse wave sensor signal (hereinafter also referred to as a pulse wave detection signal) after the DC component cut, and in the following description, an equivalent signal is referred to as an AC component signal. Since it is often performed based on this, it is assumed that S1 includes a pulse wave sensor signal after high-pass filter processing. However, a signal that has not been subjected to filter processing may be output, or a pulse wave sensor signal after low-pass filter processing may be output depending on circumstances. When S1 includes a plurality of signals (for example, both the pulse wave sensor signal before the high-pass filter processing and the pulse wave sensor signal after the processing), the processing in the pulse wave signal processing unit 111 is included in S1. It may be performed for all of the signals, or may be performed for some of the signals. Various processing contents are also conceivable. For example, an equalizer process for the pulse wave detection signal may be performed, or another process may be performed.

  The body motion signal processing unit 113 performs various signal processes on the body motion detection signal from the body motion information detection unit 20. Similar to S1, various signals can be considered as the output from the body motion information detection unit 20 shown in S2. For example, since the acceleration sensor 21 and the pressure sensor 22 are included in the example of FIG. 1, the body motion detection signal in S2 includes an acceleration signal and a pressure signal. Since the body motion detection sensor may be another sensor such as a gyro sensor, S2 includes a type of output signal corresponding to the type of sensor. The processing in the body motion signal processing unit 113 may be performed on all of the signals included in S2 or may be performed on a part thereof. For example, the signal included in S <b> 2 may be compared to perform a process for determining a signal used in the noise reduction process in the body motion noise reduction unit 115.

  In the processing in the pulse wave signal processing unit 111, a body motion detection signal may be used in accordance with the signal from the pulse wave information detection unit. Similarly, in the processing in the body motion signal processing unit 113, a signal from the pulse wave information detection unit 10 may be used in accordance with the body motion detection signal. In addition, a signal after a given process is performed in the pulse wave signal processing unit 111 on the output signal from the pulse wave information detection unit 10 may be used for the process in the body motion signal processing unit 113. And vice versa.

  The body motion noise reduction unit 115 performs a process of reducing noise (body motion noise) caused by body motion from the pulse wave detection signal using the body motion detection signal. A specific example of noise reduction processing using an adaptive filter is shown in FIG. The pulse wave sensor signal acquired from the pulse wave sensor 11 includes a component due to body movement in addition to a component due to heartbeat. The same applies to the pulse wave detection signal (pulse wave sensor signal after the DC component cut) used for the calculation of pulsation information. Of these, components useful for the calculation of pulsation information are components caused by heartbeats, and components caused by body movements hinder the calculation. Therefore, a signal (body motion detection signal) resulting from body motion is acquired using a body motion sensor, and a signal component correlated with the body motion detection signal (referred to as an estimated body motion noise component) is removed from the pulse wave detection signal. By doing so, body motion noise included in the pulse wave detection signal is reduced. However, even if the body motion noise in the pulse wave detection signal and the body motion detection signal from the body motion sensor are signals resulting from the same body motion, the signal level is not necessarily the same. Therefore, the estimated body motion noise component is calculated by performing filter processing in which the filter coefficient is adaptively determined for the body motion detection signal, and the difference between the pulse wave detection signal and the estimated body motion noise component is calculated. To do.

  FIGS. 3A to 3C illustrate the above processing in terms of a frequency spectrum. FIG. 3A and the like show the time-varying waveform of the signal at the top and the frequency spectrum at the bottom. FIG. 3A shows a pulse wave detection signal before body motion noise reduction. As shown in F1 and F2, two frequencies having large values appear in the spectrum. One of these is caused by heartbeat, and the other is caused by body movement. Note that although there are also frequencies higher than F1, the values are not considered here because they are high-frequency components corresponding to integer multiples of F1 and F2. Hereinafter, high-frequency components are also seen in FIGS. 3B and 3C, but are not considered here as well.

  On the other hand, FIG. 3B shows a body motion detection signal. If there is only one type of body motion that has caused the body motion detection signal, a frequency having a large value as shown in G1. One appears. Here, the frequency of G1 corresponds to F2 in FIG. In such a case, the signal shown in FIG. 3C is obtained by taking the difference between the pulse wave detection signal and the estimated body motion noise component by the method shown in FIG. As apparent from the figure, pulse wave detection is performed by subtracting an estimated body motion noise component having a peak G1 due to body motion from a pulse wave detection signal having two peaks F1 and F2 due to heartbeat and body motion. The body motion component (corresponding to F2) in the signal is removed, and as a result, the peak H1 (frequency corresponds to F1) due to the heartbeat remains.

  It is guaranteed that the body motion noise included in the pulse wave detection signal corresponds to the body motion detection signal, and that the body motion detection signal does not contain a signal component that adversely affects the noise reduction processing. In such a situation, since it is not necessary to perform frequency analysis in the body motion noise reduction unit 115, the frequency spectrum shown in the lower part of FIGS. 3 (A) and 3 (B) may not be considered. However, depending on the type of sensor used to acquire the body motion detection signal, there may be a case where the above condition is not satisfied. In that case, for example, the body motion signal processing unit 113 may process the body motion detection signal so as to satisfy the above condition, or a body motion detection signal that does not satisfy the above condition may be processed. Etc. may be excluded from the output. Various methods for determining whether or not the above conditions are satisfied are conceivable. For example, a frequency spectrum obtained by frequency analysis as shown in the lower part of FIGS. 3A and 3B is used. May be.

  The pulsation information calculation unit 120 calculates pulsation information based on the input signal. The pulsation information may be a pulse rate value, for example. For example, the pulsation information calculation unit 120 obtains a spectrum by performing frequency analysis such as FFT on the pulse wave detection signal after the noise reduction processing in the body motion noise reduction unit 115 and obtains a representative frequency in the obtained spectrum. The processing may be performed with the heartbeat frequency as. In that case, a value obtained by multiplying the obtained frequency by 60 is a commonly used pulse rate (heart rate).

  Note that the pulsation information is not limited to the pulse rate, and may be, for example, information indicating the pulse rate (heartbeat frequency, cycle, etc.). Moreover, the information which represents the state of pulsation may be sufficient, for example, the value showing blood flow itself (or its fluctuation | variation) is good also as pulsation information. However, since the relationship between the blood flow rate and the signal value of the pulse wave sensor signal has individual differences for each user, when the blood flow rate or the like is used as pulsation information, correction processing is performed to deal with the individual differences. It is desirable.

  Also, it detects the timing at which a given value (upper peak, lower peak, or a value above a given threshold) appears on the time-varying waveform of the input pulse wave detection signal, and corresponds to the timing interval. The pulsation information may be calculated by obtaining the heartbeat period from the time to be performed. Alternatively, the pulsation information can be calculated by transforming the waveform of the pulse wave detection signal into a rectangular wave and using the rising edge of the rectangular wave. In this case, it is not necessary to perform frequency analysis, which is advantageous in terms of calculation amount and power consumption. However, in this method, since the signal value is used as it is without being converted to the frequency axis, it is necessary to prepare the waveform to some extent. Therefore, it is desirable to perform frequency analysis in a noisy situation or the like.

  The display unit 70 (output unit in a broad sense) is for displaying various display screens used for presenting the calculated pulsation information, and can be realized by, for example, a liquid crystal display or an organic EL display.

  Specific examples of the above-described biological information detection apparatus are shown in FIGS. 4 (A) and 4 (B). FIG. 4A shows an example of a wristwatch-type pulse meter. The base unit 400 including the pulse wave sensor 11 and the display unit 70 is attached to the left wrist 200 of the subject (user) by a load mechanism 300 (for example, a band). FIG. 4B shows an example of a finger wearing type. A pulse wave sensor 11 is provided at the bottom of a ring-shaped guide 302 for insertion into the fingertip of the subject. However, in the case of FIG. 4B, since there is no space to provide the display unit 70, the display unit 70 (and a part corresponding to the processing unit 100 as necessary) is a wired connection connected to the pulse wave sensor 11. It is assumed that it is provided on the other end side of the cable. A detailed configuration example including a load mechanism (band) will be described later. In the present embodiment, the force for fixing the device main body 2 to the user's body is referred to as “load” or “press”. Strictly speaking, “load” means a force applied to the device body 2 by a load mechanism (band), and “press” means a force generated at a portion where the sensor and the skin are actually in contact with each other. It may be interpreted that the same power is intended.

2. Method of this Embodiment Hereinafter, the method of this embodiment will be described. In the following description, a process for obtaining an appropriate pressure will be described as an example. However, it is possible to apply the method of the present embodiment (displaying a posture state notification image or the like) to scenes other than the determination of an appropriate pressure.

  As described above, by using a pulse wave sensor such as a photoelectric sensor, a pulse wave sensor signal corresponding to a blood circulation state (for example, blood flow volume) can be acquired. However, when the arm or the like is strongly pressed, the blood flow is reduced by the external pressure on the living body (in the narrow sense, the blood vessel), as can be easily understood from the fact that the blood flow is reduced at the distal side of the compressed portion. Change. In other words, if the external pressure is excessively strong, the signal value of the pulse wave sensor signal is reduced, and the influence of noise is relatively increased (the SN state is deteriorated), which hinders subsequent processing (for example, the pulse). The accuracy of beat information based on the wave sensor signal is reduced).

  Further, even if the external pressure is too small, the signal value of the pulse wave sensor signal becomes small, which is not preferable. As one of the factors, the influence of components caused by veins can be considered. In the pulse wave sensor, both the component caused by the artery and the component caused by the vein are acquired, but the widely used technique is to calculate pulsation information based on the artery component of the sensor. The vein component adversely affects the noise of the pulse wave sensor signal. That is, when the external pressure is too small, the influence of the venous component appears and the S / N ratio of the pulse wave sensor signal becomes small, which is also not preferable. An example of change characteristics of the AC component signal (pulse wave detection signal) with respect to the external pressure is shown in FIG. As can be seen from FIG. 6, the signal value decreases when the pressure is excessive or excessive.

  The point that blood flow is reduced by applying external pressure is the same for both arteries and veins. However, it is known from the characteristics of living bodies that blood flow is sufficiently reduced with a small external pressure compared to arteries. That is, the pressure at the point where the blood flow in the vein is sufficiently lowered (disappeared in the narrow sense) (hereinafter referred to as “venous vanishing point”) is V1, and the point where the blood flow in the artery is sufficiently lowered (hereinafter referred to as “arterial vanishing point”). When the pressure in the notation is V2, the relationship of V1 <V2 is established. In this case, the case where the external pressure is larger than V2 corresponds to the above-described situation where the external pressure is excessively strong, and the arterial component to be originally acquired has disappeared and a sufficient signal value cannot be obtained. On the other hand, the case where the external pressure is smaller than V1 corresponds to the above-described situation where the external pressure is excessively small, and it is influenced by the venous component, so that a sufficient signal value cannot be obtained.

  That is, by applying an external pressure V satisfying V1 <V <V2 to the subject, it is possible to sufficiently suppress the influence of the venous component and not to unnecessarily reduce the blood flow of the arterial component. In the present embodiment, V that satisfies the above condition is set as an appropriate pressure. In addition, appropriate press may point out the partial range, specific pressure value, etc. instead of all V which satisfy | fill the said conditions.

  Conventionally, a contact pressure is measured at a portion where biological information is detected using a pressure sensor or the like, and whether the current pressure is an appropriate pressure based on a comparison process between the contact pressure and a given reference value. A method of presenting such information to the user as a graph display is disclosed. However, vital signs such as a pulse are extremely different from person to person, and the above-described proper pressing also takes a different value (range) for each user. Therefore, unless a reference value to be compared with the measured contact pressure is determined for each user, it is not possible to deal with individual differences. However, the conventional method only describes processing based on physical information such as simple pressure. Since it is unlikely that signals due to individual differences will be superimposed on physical information such as pressure, and a method for setting a reference value corresponding to individual differences is not disclosed, methods for dealing with individual differences are disclosed in conventional methods. It will not be.

  Therefore, in the conventional method, even if the user is instructed to adjust the magnitude of the external pressure by a graph display or the like, the result of following the instruction is in an appropriate state as long as the appropriate pressure as a reference cannot cope with individual differences. It is not known whether this is the case, and this point is considered as the first problem.

  Further, as a second problem of the conventional method, there is a point that the influence of the water head pressure is not sufficiently considered. It is known that the blood circulation state depends not only on the external pressure but also on the internal pressure, which is the pressure inside the blood vessel, and water head pressure is considered as one factor that determines the internal pressure. Since the magnitude of the hydrocephalic pressure changes depending on the position in the vertical direction (ie, height), the user's posture (in a narrow sense, the mounting position of the biological information detection device and the relative position in the height direction of the user's heart) ) Depending on the value. In the present embodiment, as will be described later, pulse wave signal information in different pressing states is detected, and the pressure determination is performed based on the detected pulse wave signal information. Therefore, at least the value of the hydraulic head pressure in each pressing state is largely fluctuated. Don't be. In addition, when it can be assumed that the biological information detection device is actually used, it is possible to detect the pulse wave signal information during use by determining the appropriate pressure in the same state as the water head pressure state during the use. Accuracy can be improved. For example, if it is assumed that the device is worn on the wrist during running, the proper pressure determination may be performed with a posture that reproduces the wrist position during running as much as possible. However, these points are not considered in the conventional method. Further, in walking and running, the rate of superimposing body motion noise increases because the arm swings faster during running, and the degree of difficulty in detecting pulse wave signal information tends to increase during running. For this reason, it is better to set an optimal pressure by assuming an exercise state such as running rather than walking.

  Therefore, the present applicant proposes a method for determining proper pressing based on the pulse wave sensor signal. Since the characteristics of the pulse wave sensor signal appear for each user, it is possible to cope with individual differences as long as the determination is based on the pulse wave sensor signal. Furthermore, although the same user can change the range of appropriate pressing due to changes in physical condition or the like, the method of this embodiment can cope with such changes.

  However, as described above, since the signal value of the pulse wave sensor signal is different for each user, there are users who have a relatively large signal value and a small user at the appropriate pressure. Therefore, even if a signal value at a certain pressure is used alone, it is difficult to determine whether the pressure is an appropriate pressure. Therefore, in the present embodiment, it is assumed that the pulse wave sensor signal is acquired while changing the pressure, and whether or not the pressure is appropriate is determined by using the change characteristic of the pulse wave sensor signal with respect to the pressure.

  Further, by displaying a posture state notification image (for example, FIG. 17A and FIG. 17B described later) before the measurement process in a given pressed state, the posture suitable for the measurement process for the user. Encourage state taking. By instructing the user to an appropriate posture using the posture state notification image, it is possible to solve the above-described problem regarding the hydraulic head pressure. Further, it is known that the pulse wave signal information varies depending on the user's exercise state, and the variation causes a decrease in accuracy when determining the appropriate pressure. Therefore, in the posture state notification image, not only the hydraulic head pressure is made appropriate, but also an instruction to put the posture in a resting state may be issued.

  The individual differences are also taken into account when displaying the results of measurement processing in each pressed state. Since the absolute value of pulse wave information has large individual differences as described above, if the graph is displayed using the absolute value as it is, some users may not be able to display the axis scale, and all pulse wave information The value of becomes too small compared to the scale of the axis, and the problem that the difference cannot be recognized occurs. Therefore, in this embodiment, the value of the measured pulse wave information is displayed after performing the normalization process. A specific normalization method and the like will be described later with reference to FIGS. 20A to 20E, but if this is done, individual differences in the absolute value of the pulse wave information can be absorbed and It is possible to present a result display screen that is easy to visually recognize (in a narrow sense, it is easy to recognize fluctuations in the value of pulse wave information according to the pressed state).

  In the present embodiment, when it is determined whether or not the pressure is appropriate, information indicating a load state when the pressure is determined to be appropriate is presented to the user. This is, for example, information that an appropriate pressure can be applied in the case of this user if the device is mounted using what band hole. In this way, an appropriate wearing state can be defined not by the value of pressing but by the tightening degree of the band, etc., so that it is intuitive and easy for the user to understand. Further, if the information is stored and displayed when the biological information detecting device is remounted, the user can easily reproduce the holding state that realizes the appropriate pressing. That is, adjustment or the like is not necessary at the time of remounting, which is advantageous from the viewpoint of convenience.

  The conventional technique also discloses a technique of automatically pressurizing and depressurizing using a pump or the like. This method is preferable in that it does not require manual adjustment of the user's wearing state, but when it is assumed to be used during daily life or exercise like a wrist-worn device, considering the size, power consumption, etc. Such a technique is not considered here because it is not realistic. That is, in the present embodiment, the pressure is changed in the appropriate pressure determination as described above, but it is assumed that the pressure change is performed by the user's hand. Therefore, in order for the system to instruct the user about an appropriate pressure change, interaction with the user using an interface such as a display unit is important.

  Hereinafter, after describing a specific system configuration example of the biological information detection apparatus, an example of an image displayed on the display unit will be described. After that, as a specific example of the process in which the posture state notification image, the normalization graph, and the like are displayed, the appropriate pressure determination process is described.

3. Configuration Example of Biological Information Detection Device A configuration example of the biological information detection device will be described. Specifically, after describing a system configuration example of the biological information detection apparatus, a structure such as a load mechanism will be described.

3.1 Specific System Configuration Example FIG. 5 shows a specific system configuration example of the biological information detection apparatus of this embodiment. The biological information detection apparatus includes a pulse wave information detection unit 10, a body motion information detection unit 20, a processing unit 100, a display unit 70, an external I / F unit 80, and a storage unit 90. However, the biological information detection apparatus is not limited to the configuration of FIG. 5, and various modifications such as omitting some of these components or adding other components are possible. For example, in this embodiment, reduction of body movement noise is not essential, and the body movement noise reduction unit 115 of the processing unit 100 may be omitted.

  The pulse wave information detection unit 10 includes a pulse wave sensor 11, filter processing units 15-1 and 15-2, and A / D conversion units 16-1 and 16-2. However, the pulse wave information detection unit 10 is not limited to the configuration of FIG. 5, and various modifications such as omission of some of these components and addition of other components are possible.

  The pulse wave sensor 11 uses a photoelectric sensor or the like as described above with reference to FIG. The filter processing unit 15-1 is realized by a high-pass filter that performs high-pass filter processing in the present embodiment, and the filter processing unit 15-2 is realized by a low-pass filter that performs low-pass filter processing in the present embodiment. That is, the output of the filter processing unit 15-1 is an AC component signal that is a high frequency component of the pulse wave sensor signal, and the output of the filter processing unit 15-2 is a DC component signal that is a low frequency component of the pulse wave sensor signal. It is. In this embodiment, the pulse wave information detection unit 10 includes an A / D conversion unit 16-1 and an A / D conversion unit 16-2, and converts each input analog signal into a digital signal and outputs the digital signal.

  As shown in FIG. 5, the pulse wave sensor 11 is connected to the filter processing unit 15-1 and the filter processing unit 15-2. The filter processing unit 15-1 is connected to the A / D conversion unit 16-1. The A / D conversion unit 16-1 is connected to the body motion noise reduction unit 115 and an appropriate pressure determination unit 119 described later. The filter processing unit 15-2 is connected to the A / D conversion unit 16-2. The A / D conversion unit 16-2 is connected to the appropriate pressure determination unit 119.

  The pulse wave information detection unit 10 may omit the filter processing unit 15-2. In that case, the output of the A / D converter 16-2 is a signal including both the high frequency component and the low frequency component of the pulse wave sensor signal. In addition, various modifications can be made to the connection of each unit included in the pulse wave information detection unit 10.

  The body motion information detection unit 20 includes an acceleration sensor 21 and an A / D conversion unit 26. The acceleration sensor 21 is connected to an A / D conversion unit 26, and the A / D conversion unit 26 is connected to a body movement noise reduction unit 115 and an appropriate pressure determination unit 119. The body motion information detection unit 20 only needs to have a sensor for detecting body motion, and the acceleration sensor 21 may be changed to another sensor or may have a plurality of sensors.

  The processing unit 100 includes a signal processing unit 110, a pulsation information calculation unit 120, a display control unit 130, and a time measurement unit 140. The signal processing unit 110 includes a body movement noise reduction unit 115 and an appropriate pressure determination unit. 119. However, the processing unit 100 and the signal processing unit 110 are not limited to the configuration in FIG. 5, and some of these components (for example, the body motion noise reduction unit 115) are omitted or other components are added. Various modifications of the above are possible.

  The appropriate pressing determination unit 119 is configured to perform pressing corresponding to the signal acquisition timing based on at least one of the AC component signal from the A / D conversion unit 16-1 and the DC component signal from the A / D conversion unit 16-2. It is determined whether or not the pressure is proper. At this time, a body motion detection signal from the body motion information detection unit 20, time measurement information from the time measurement unit 140, or the like may be used. Further, the holding state specifying information for specifying the holding state of the load mechanism 300 when it is determined that the pressure is appropriate based on the information from the external I / F unit 80 is acquired, and the acquired holding state specifying information is stored. Output to the unit 90 and the display control unit 130. Details of processing in the appropriate pressure determination unit 119 will be described later.

  The body movement noise reduction unit 115 performs body movement noise reduction processing on the AC component signal from the A / D conversion unit 16-1 based on the body movement detection signal from the body movement information detection unit 20. The processing content of the body motion noise reduction unit 115 is the same as that described above with reference to FIG. The processing in the pulsation information calculation unit 120 is also as described above.

  The display control unit 130 performs control for display on the display unit 70. For example, in the determination by the appropriate pressure determination unit 119, it is necessary to change the pressure, but control is performed to display an instruction screen for instructing the user so that an appropriate pressure change can be realized. Moreover, you may perform control which displays the instruction | indication screen which performs the instruction | indication which sets the environment for determination whether it is an appropriate press. In addition, display control of the pulsation information calculated by the pulsation information calculation unit 120 is also performed. Details will be described later.

  The time measurement unit 140 performs time measurement processing. For example, it is possible to have a timer that acquires time information such as a time stamp at a given interval and measure the time from the difference of the acquired time information.

  The display unit 70 displays various types of information according to the control contents in the display control unit 130. The external I / F unit 80 serves as an interface with the outside, and may be an operation unit having various buttons, a GUI, and the like for a user to perform various operations of the biological information detection apparatus in a narrow sense. The storage unit 90 serves as a work area for the processing unit 100 and the like, and its function can be realized by a memory such as a RAM, an HDD (hard disk drive), or the like. The storage unit 90 stores various types of information, but particularly stores the holding state specifying information acquired by the appropriate pressure determination unit 119.

3.2 Configuration Example of Load Mechanism, etc. Next, the structure of the load mechanism and the pulse wave information detection unit (particularly the contact portion with the living body) will be described. As shown in FIG. 7, the biological information detection device includes a device main body 2 that is in close contact with a human body and measures the biological information, and a band (load mechanism in a broad sense) 3 that is attached to the device main body 2. The band 3 includes a first band member 4 and a second band member 5. Here, it is assumed that the device main body 2 includes the pulse wave information detection unit 10, the processing unit 100, and the display unit 70 described above. And the band 3 has the expansion-contraction parts 43 and 53 as shown in FIG.

  FIG. 8 is a plan view showing an extended state of the stretchable portion 43. Such a stretchable part 43 has the first slit 435 and the second slit 436, and can extend along the A1 direction according to the wearer's tensile force, as shown in FIG. In addition, since the expansion-contraction part 43 has flexibility, when the expansion-contraction part 43 is extended | stretched, the restoring force which tries to return to the original acts. For this reason, when a wearer's tension | pulling force is cancelled | released, it will shrink | contract in the direction opposite to A1 direction with the said restoring force, and the expansion-contraction part 43 will return.

  FIG. 9 is a plan view showing a twisted state of the stretchable portion 43. Moreover, the expansion-contraction part 43 can be twisted as shown in FIG. 9 by having the 1st slit 435 and the 2nd slit 436. FIG. As described above, since the stretchable portion 43 is configured to be twistable, twisting (tilting) between the device main body 2 and the first band member 4 is allowed when the biological information detection device is attached to a wrist or the like. The device body 2 can be appropriately crimped to the wrist.

  Further, the biological information detection apparatus has a connecting member 6 as shown in FIG. 10 and 11 are perspective views showing the connecting member 6. 10 shows the connecting member 6 before the slide member 62 slides, and FIG. 11 shows the connecting member 6 after the slide member 62 slides. FIG. 12 is an exploded perspective view showing the connecting member 6.

  The connecting member 6 is a metal or synthetic resin member that functions as a beautiful tablet that connects the first band member 4 and the second band member 5. As shown in FIGS. 10 to 12, the connecting member 6 is formed in an arc shape so that a cross section along the A1 direction has a predetermined curvature along the wrist.

  Such a connecting member 6 includes a fixing member 61 (FIGS. 10 to 12), a slide member 62 (FIGS. 10 to 12) that slides on the fixing member 61 along the A1 direction, and a projecting bar 63 (FIG. 10 and FIG. 11) and a coil spring 65 (FIG. 12).

  As shown in FIGS. 10 to 12, the fixing member 61 is a frame-like body that slidably supports the slide member 62. The fixing member 61 includes a base portion 611 extending along the B direction and a pair of extending portions 612 and 613 connected by the base portion 611 and extending along the A1 direction.

  The extension part 612 located on the left side in FIG. 12 includes an insertion hole 6121, a locking part 6122, a convex part 6123, a long hole 6124, and a display part (not shown).

  The locking portion 6122 is formed so as to protrude from the end portion of the extension portion 612 opposite to the first band member 4 side toward the other extension portion 613. The locking portion 6122 locks one end of a coil spring 65 described later.

  The convex portion 6123 is formed on the upper surface of the extending portion 612 facing the slide member 62 along the A1 direction.

  The elongated hole 6124 is formed along the A1 direction on the side surface of the extending portion 612 that faces the extending portion 613. An end of a spring bar 64 to be described later is inserted into the long hole 6124.

  The display portion 6135 is formed along the A1 direction on the side surface of the extension portion 613 opposite to the extension portion 612. The display unit 6135 is provided with a scale indicating an appropriate slide range of the slide member 62. Specifically, in the present embodiment, the display unit 6135 is provided with two points P1 and P2 indicating the appropriate slide range. If the end of the slide member 62 on the first band member 4 side is located within the range indicated by these two points P1, P2, an appropriate tensile force is applied by the band 3.

  As shown in FIGS. 10 and 11, the slide member 62 slides relative to the fixing member 61 along the direction A <b> 1 so that the length dimension of the band 3 and the pressure applied to the human body by the device main body 2 are reduced. adjust. That is, the slide member 62 has a function of applying a tensile force to the band 3 so that the device main body 2 is in close contact with the human body.

  As shown in FIGS. 10 to 12, the slide member 62 includes a pair of first side portions 621 and 622 along the A1 direction, and an end portion of the first side portions 621 and 622 along the B direction. It has the 2nd side parts 623 and 624 to connect, and the whole is formed in the substantially rectangular frame shape by these. Note that the second side 624 is desirably provided to improve the strength of the slide member 62, but the function of the slide member 62 is satisfied even without the second side 624.

  In addition to the display portion 6135, a positioning piece 6136 serving as a second display portion may be provided. That is, as shown in FIGS. 13 to 14C, a hole 6137 is formed in the surface of the extending portions 612 and 613 of the fixing member 61, and a positioning piece 6136 is welded and embedded in the hole 6137. For example, the fixing member 61 and the positioning piece 6136 are made of the same synthetic resin (for example, polyacetal: POM) and are colored in different colors. In the present embodiment, the positioning piece 6136 is formed of a synthetic resin colored in yellow.

  Then, when the slide member 62 is slid, as shown in FIG. 14B, the position where the positioning piece 6136 starts to be seen is set as the minimum movement amount of the slide member 62, and as shown in FIG. The position where the entire piece 6136 is completely visible is defined as the maximum movement amount of the slide member 62. By moving the slide member 62 so as to be within this range, the user can easily grasp an appropriate pulling position.

  By adopting the configuration having the expansion / contraction portions 43 and 53, it is possible to stably attach the biological information detection device horizontally to the wrist. In addition, by providing the display portion 6135 and the positioning piece 6136, it is possible to present the state of the applied pressure to the user. However, as described above, since the appropriate pressure has a large individual difference for each user, in this embodiment, the appropriate pressure is determined using the pulse wave information. That is, the display unit 6135 or the like indicates a general guideline of the appropriate pressing range, and is used for applications such as narrowing down the search range of the pressed state to some extent based on the guideline. It is assumed that the method described later is used.

  Next, the structural example of the contact part with a user's wrist surface among the pulse wave information detection parts 10 is demonstrated. 15A and 15B are schematic views in which a part of the back surface (wrist side) of the device main body 2 is enlarged. Specifically, FIG. 15A is an enlarged view of a region where the pulse wave information detection unit is provided in the device main body 2. As shown in FIG. 15A, the pulse wave information detection unit 10 includes an LED 18 that irradiates light, and a photodiode (PD) 19 that receives reflected light resulting from the reflected light being reflected by a living body. And the convex part 17 which becomes a contact part with a biological body. The living body information detection apparatus of the present embodiment has a convex portion shown in FIG. 15A, and applies pressure efficiently to the living body, and is applied to the living body at the convex portion. This pressure is the pressure described above.

  As shown in FIGS. 15A and 15B, the pressure changes as the load state changes, and as a result, the contact area between the convex portion and the living body also changes. Here, for example, as shown in FIGS. 15 (A) and 15 (B), if the reflected light is received in a region that comes into contact with the living body regardless of the load state, that is, a region where pressure can be appropriately applied, The pulse wave information can be accurately measured based on the received reflected light. Here, the example of the structure of the contact portion on the user's wrist surface has a convex shape, but this is not a limitation.

3.3 Configuration Example of External Processing In the above example, the processing unit 100 that performs pulse wave information measurement processing and appropriate pressure determination processing, and the display unit 70 that displays the posture state notification image are included in the biological information detection device. It was described as being included. However, the present embodiment is not limited to this, and processing and display may be performed in another electronic device such as a smartphone.

  A specific example is shown in FIG. In the example of FIG. 16, the device WA that the user wears on the wrist or the like includes a pulse wave sensor 11 that detects pulse wave information, a body motion sensor (acceleration sensor 21) that detects body motion information, pulse wave information and body And a communication unit that transmits dynamic information to other electronic devices. In this case, the processing by the processing unit 100 described above is not performed in the device WA.

  The communication unit of the device WA transmits pulse wave information and body motion information to the electronic device SP, and the electronic device SP performs processing by acquiring the pulse wave information and body motion information. Specifically, the electronic device SP includes a processing unit and a display unit, the SP processing unit performs the same processing as the processing unit 100 described above, and the SP display unit performs the same processing as the display unit 70 described above. Do.

  In general, a small-sized biological information detection device is used in consideration of the fact that it does not hinder the user's movement and the like and is easy to wear for a long time. Therefore, the processing performance of the processing unit 100 and the size of the display area of the display unit 70 are limited. In that respect, if the device WA is used for acquisition and transmission of sensor information, and if the actual processing and display are performed by another electronic device SP, high-speed processing, display on a relatively large screen, and the like become possible. . In particular, a portable terminal such as a smartphone can be easily carried around when biometric information is detected (for example, when walking or running), and thus can be used as a display device.

  Various modifications can be made to the configuration of the device that performs processing and the device that performs display. For example, it is assumed that pulse wave information or the like is processed by a smartphone and a display image (or corresponding information) is generated, the display image is transmitted to the device WA, and the display is performed by the display unit 70 of the device WA. Also good. This configuration is effective when processing with a large processing load is assumed.

  Further, the device for processing is not limited to a device (for example, a device worn and carried by the user) provided at a position close to the user. For example, if the device WA is configured to be able to communicate with a network NW such as the Internet, the pulse wave information obtained from the sensor is transmitted to the server system SE connected via the network NW, and the processing unit 100 The server system SE may perform processing corresponding to the above. Then, the processing result is transmitted to a device that displays the processing result (the device WA may be used as described above, the electronic device SP may be used, or another electronic device may be used).

  As can be seen from the above, the method of the present embodiment can be realized by various electronic devices.

4). Specific Example of Display Screen Next, an example of a display screen displayed on the display unit 70 and an example of screen transition in the method of the present embodiment will be described.

4.1 Posture State Notification Image FIGS. 17A and 17B are examples of posture state notification images. As shown in FIG. 17A, the object is positioned at a position corresponding to the current posture state of the user in the display area of all or a part of the display unit 70 (a part in the example of FIG. 17A). A1 is displayed. The case where the object is located in the first area A2 of the display area corresponds to the case where the posture state is appropriate, and the case where the object is located in an area other than the first area A2 is appropriate. It corresponds to the case that is not.

  That is, the display unit 70 updates the position of the object A1 in real time according to the posture state of the user. For the user wearing the biometric information detection device, the position of the object A1 changes according to its own posture change, so that the object A1 comes to the first region while viewing the posture state notification image (see FIG. 17 (B)) to adjust his / her posture.

  Here, the posture state of the user is determined by a determination process in the processing unit 100. For example, the processing unit 100 may acquire acceleration information from the acceleration sensor 21, which is one of the body motion sensors, and determine the posture state using the acquired acceleration information. Specific examples are shown below. However, the determination process of the posture state in the processing unit 100 may be realized by other methods.

  Consider the coordinate axis set in the biological information detection apparatus shown in FIG. Here, the direction from the user's forearm to the hand is the X axis, the direction orthogonal to the display unit 70 and from the wrist to the display unit 70 side is the Z axis, and the axis orthogonal to the X axis and the Z axis is the Y axis. . As shown in FIG. 18A, it is assumed that the X axis, the Y axis, and the Z axis are left-handed. The acceleration sensor 21 of the present embodiment detects an acceleration value on this axis as sensor information. For example, when the user is in a resting state (an acceleration value due to exercise is not detected), the X axis of gravity acceleration is detected. A signal, etc., in which the component, the Y-axis component, and the Z-axis component are acquired as the values of the XYZ axes are sensor information.

  That is, if the XYZ value in an appropriate posture and the posture deviation allowed for measurement of pulse wave information (allowable fluctuation values for each axis of XYZ) are determined, the XYZ values corresponding to the appropriate posture are determined. The range is set, and it is possible to determine whether or not the current posture state is appropriate by comparing the acceleration value in the current posture state with the numerical range.

  As described above, the posture suitable for measuring pulse wave information represents a posture in which the hydraulic head pressure in the posture is approximately the same as the hydraulic head pressure in the posture assumed at the time of measurement. This is because if the appropriate pressure is determined in such a posture, the state of the hydraulic head pressure is close between the appropriate pressure determination and the actual measurement, and the pulse wave information can be obtained by using the appropriate pressure as the determination result. This is because improvement in detection accuracy can be expected. The posture assumed at the time of measurement may change depending on the shape and mounting position of the biological information detection device, the intended use, and the like. Here, the posture during exercise such as walking or running is considered.

  Since the arm is swung during walking and running, the position (height) in the vertical direction of the biological information detection device changes, but here it is shown as E1 in FIGS. 19 (A) and 19 (B). As described above, a state where the elbow is bent and the arm is brought close to the trunk is set as an appropriate posture. FIG. 19A corresponds to a view of an appropriate posture viewed from the front, and FIG. 19B corresponds to a view of the appropriate posture viewed from the side.

  Next, let us consider the allowable numerical range of XYZ when the posture of FIG. 19A (E1 of FIG. 19B) is used as a reference. Here, the state of the posture of FIG. 19A, that is, the X-axis direction when the Z-axis direction coincides with the opposite direction of the gravity direction is set as the X-axis reference direction, and the Y-axis direction is set as the Y-axis reference direction. . As shown in FIGS. 18B and 18C, the X-axis rotation (rotation around the Y-axis) angle with respect to the X-axis reference direction is θx, and the Y-axis rotation (X Rotation around the axis) θy is an angle, and an allowable posture change is determined from θx · θy. Note that θx and θy are described assuming that the rotation on the gravity direction side is a positive value and the rotation on the opposite side of the gravity direction is a negative value, as shown in FIGS. 18B and 18C.

  Here, the first thing to consider is the rotation of θy in the positive direction. The rotation of θy in the positive direction is a movement that directs the display unit 70 toward the user's face as can be seen from FIG. 18B, FIG. 19A, and FIG. It becomes a movement. However, as you can see by actually performing such a positive rotation and a negative rotation, the ergonomic rotation is narrow and unnatural. It becomes operation. Such an unnatural movement will apply a large twisting force to the arm. When a twist is applied to the arm, pressure fluctuation occurs due to the influence of the twist, and the value of the pulse wave information also fluctuates as compared with the case where there is no twist. As described above, in the determination process of the appropriate pressure, it is desirable that the state is close to the actual measurement, and such a twist must be prevented from being applied.

  Furthermore, since the rotation of θy in the plus direction becomes an unreasonable posture for the user as described above, it is a burden on the user to continue for a long time. As will be described later, considering that a certain amount of time is required to measure pulse wave information in a given load state, it is not preferable to make such a posture appropriate.

  Further, in a posture in which θy is plus, it becomes an ergonomically comfortable posture by raising the arm itself as shown by E2 and E3 in FIG. In other words, if the rotation of θy in the positive direction is allowed, it is highly likely that the user will raise his arm in an attempt to cancel his unreasonable posture, and as a result, the head pressure state will deviate from the state assumed at the time of measurement. End up.

  In other words, if you consider the decrease in the accuracy of pulse wave information due to twisting, the burden on the user due to an unreasonable posture, and the possibility that the arm will rise when trying to eliminate the unreasonable posture, the allowable range of θy is negative compared to positive It is considered good to take a wide range. Therefore, here, a range in which the median is a negative value is set as the angle range of θy, such as −18 degrees <θy <+6 degrees.

  Next, consider θx. As for θx, both the rotation in the plus direction and the rotation in the minus direction change the height of the biological information detecting device. Therefore, although the fluctuation should be suppressed, it is not preferable to require an excessively accurate posture from the user, and therefore, it is determined that the posture is appropriate within a certain angle range. And, unlike θy, there is no reason why either should be emphasized in the plus direction or minus direction. Therefore, for example, an angle range such as −12 degrees <θx <+12 degrees may be set.

  Note that the Z-axis usually takes a value close to -1G. The range of angle variation may be set for the Z axis as well as the X axis and the Y axis. However, here, the determination processing of the posture state is performed on the two axes XY, and a fine angle range is set for the Z axis. Shall not. However, when the acceleration value of Z is significantly different from -1G (for example, when the value of Z is positive), there is an inappropriate operation such as swinging up the arm or an error has occurred. Therefore, it may be determined that the posture is not appropriate regardless of the X-axis and Y-axis values, or some error processing may be performed.

  Here, whether or not the posture is appropriate is defined from θx and θy, but as described above, the actual sensor information is the acceleration value of each axis of XYZ. Therefore, instead of using the angle range of θx and θy as they are, a numerical range of acceleration values of the XYZ axes corresponding to the angular range is obtained, and the posture state determination process is performed using the numerical range. Good. For example, if a correspondence relationship is obtained such that θy = + 6 degrees corresponds to about 0.10 G as the acceleration value of the Y axis and θy = −18 degrees corresponds to about −0.31 G as the acceleration value. The condition of 18 degrees <θy <+6 degrees can be converted into a condition of −0.31 G <ay <0.10 G with respect to the Y-axis acceleration value ay.

  The posture state is determined by the above processing, and the result may be displayed as the posture state notification image shown in FIGS. 17 (A) and 17 (B). In the example of FIG. 17A or the like, the range (A3) in the horizontal axis direction of the first region is made to correspond to the allowable range in the X axis, and the range in the vertical direction of the first region (A4). ) May correspond to the allowable range on the Y axis. For example, as described above, if a numerical range of −0.31G <ay <0.10G is set for ay, the numerical range of the Y axis (0.41G in the above example) is divided by the number of dots corresponding to A4. Thus, if the numerical change amount due to the difference in the display position of 1 dot is defined, the display position of the object A1 in the vertical axis direction can be changed and displayed according to the attitude change in the Y axis direction. . Considering the X-axis direction in the same way, it is possible to notify the user whether or not the posture state is appropriate based on the position of the object A1 in the posture state notification image. The same applies to regions other than the first region.

  Here, as shown in FIGS. 17A and 17B, the display is made depending on whether the object A1 is in the first area or the second area other than the first area. You may change an aspect. In FIG. 17A and FIG. 17B, the difference is whether the object is represented by a black circle (filled) or a white circle (empty). By doing in this way, it can be shown to a user clearly whether the present posture state is appropriate. The display mode change is not limited to the method shown in FIGS. 17A and 17B, and may be a shape change or a color change. Also good. Further, instead of changing the display mode, a method such as generating sound or vibration when the object is located in the first area may be used.

4.2 Normalized graph When it is determined that the posture state is appropriate, pulse wave information in the current load state (pressed state) is measured. At this time, as described above, since the absolute value of the pulse wave information has a large individual difference for each user, it is necessary to pay attention to the scale of the axis when displaying the graph. Specifically, there are not enough numerical ranges that can be displayed, and the graph does not properly reflect the numerical values, or the numerical range is too wide (for example, the upper limit is too large), so all the graphs are displayed small and can be compared visually. It is not preferable to be in a difficult state.

  Therefore, here, normalization processing is performed using the measurement results obtained so far (levels in each load state), and a graph after the normalization processing is displayed. Specific examples are shown in FIGS. 20A to 20E. Here, the absolute value of the amplitude is used as the level of the pulse wave information, but the present invention is not limited to this.

  First, assume that the level in the first load state is 300. In this case, in order to avoid the numerical value of 300 being displayed excessively large (exceeding the displayable range) or being excessively small, normalization processing is performed using the value 300 of the level. . Specifically, the upper limit value is determined so that the height of the graph in the first load state is 80% of the display range. Specifically, since 300 / 0.8 = 375, the maximum value of the axis may be set to 375 (FIG. 20A).

  Next, assume a transition to the second load state, and an amplitude of 800 is obtained in this state. In this case, 300 and 800 are compared, and normalization processing is performed using a larger 800. Specifically, similarly to the first load state, 800 / 0.8 = 1000 may be set as the maximum value of the shaft. In this case, the value in the second load state is 80% of the display range, and the value of 300 acquired in the first load state is 30% of the display range because the maximum value of the axis is 1000. This corresponds to the position (FIG. 20B). In the present embodiment, it is only necessary to visually present the relative relationship between levels in each load state (a specific appropriate pressing determination process will be described later). Therefore, when FIG. 20A is compared with FIG. As can be seen, even if the absolute values are the same, the size of the displayed graph varies depending on the result of the normalization process.

  Similarly, if the result in the third load state is 1300, normalization processing is performed using 1300 which is the maximum value among the three values, and 1300 / 0.8 = 1625 is set as the maximum value of the axis. As a graph (FIG. 20C). Similarly, if the result in the fourth load state is 1400, normalization processing is performed using 1400 which is the maximum value among the four values, and 1400 / 0.8 = 1750 is set as the maximum value of the axis. A graph is created (FIG. 20D).

  Further, if the result in the fifth load state is 1000, the maximum value among the five values is 1300 corresponding to the fourth load state, and therefore the normalization process is the same as in FIG. Then, a graph is created with 1300 / 0.8 = 1625 as the maximum value of the axis (FIG. 20E).

  As described above, the determination result of the appropriate pressure in a form that is visually easy to understand regardless of the value of the pulse wave information obtained by absorbing the individual difference of the absolute value of the pulse wave information (Or progress in progress) can be presented.

  In the above example, the normalization process is performed using the maximum value of the level. However, the present invention is not limited to this, and various modifications such as performing the normalization process using both the upper limit value and the lower limit value are possible. Implementation is possible. Further, when the graph is displayed on the display unit 70, the display of the vertical axis, the horizontal axis, or both axes may be omitted. By doing in this way, the visibility of a small screen improves.

  In addition, in FIG. 20 (A) to FIG. 20 (E) and the like, the pulse wave information being measured is not displayed, but as shown in FIG. 21, the provisional result is displayed for the value currently being measured. Also good. The provisional result display can be expected to have an effect of notifying the user that the measurement process is being properly performed even in the next load state, prompting the user to wait, or not indicating a failure or the like. From this point of view, it is not necessary to reflect the provisional result (for example, the fluctuation state of the AC component signal) during the measurement process on the display, and the display may be performed regardless of the actual signal value.

  Furthermore, since the processing unit 100 performs the pulse wave information measurement process, the display may be performed using the AC component signal that is actually acquired. For example, a graph that moves up and down like C1 in FIG. 21 may be displayed corresponding to the amplitude value of pulse wave information that oscillates with time (up and down arrows in FIG. This means that the graph moves up and down in the C1 portion, not the meaning of display). In this way, even before the end of the measurement process, the user can estimate the approximate measurement result by looking at the display image, and clearly has a low value (extremely large). If a value or an extremely small value is displayed, it is possible to suspect an error and take countermeasures.

4.3 Instruction image In this embodiment, the determination process of an appropriate press is performed by comparing the measurement results of pulse wave information in a plurality of load states (press states). Therefore, when a measurement result in a given load state is obtained and there is still an unmeasured load state, it is necessary to shift to the unmeasured load state.

  Therefore, here, when the processing in a given load state is completed, an instruction image that prompts the user to change the load state is displayed on the display unit 70 as shown in FIG.

4.4 Final result image When the measurement process in all the load states is completed, or there is an unmeasured load state, but the measurement process is completed (the biometric information detection device may make an end determination, In the case of termination according to a termination instruction from the user), an appropriate pressing determination result image is displayed.

  Specifically, it is an image shown in FIG. 23 or the like, and is a display for informing the user of an optimum load state (here, the band position). Here, similarly to FIG. 20E, the measurement result (level) of the pulse wave information in each load state may be displayed as a normalized graph. In this way, it is possible not only to simply notify the optimum load state but also to visually present the relative relationship of each load state.

4.5 Example of Screen Transition Next, an example of screen transition will be described. When starting the determination process of appropriate pressing, first, the load state and the posture state are roughly adjusted. Specifically, a load state instruction image is displayed as shown in D1 of FIG. Here, the adjustment line represents, for example, the display unit 6135 and the positioning piece 6136 in FIG. As described above, even if the display unit 6135 and the positioning piece 6136 are used, it is not possible to deal with individual differences in proper pressing, but it is possible to determine a range of proper pressing that can be generally considered. By displaying this image and instructing the load state, the state where the pressure is extremely small (e.g., the band is loose) or the pressure is extremely large (e.g. It is possible to skip the processing in the state where the band is tight.

  Next, as shown in D2 of FIG. 24, a posture state instruction image for instructing a rough posture state is displayed. Without such an instruction, the user can take an arbitrary posture, and it may be difficult to effectively use the posture state notification image. Therefore, a rough posture state is instructed here by the posture state instruction image.

  Next, the posture state notification image described above is displayed. Since the specific description has been given above, it will be omitted. Then, when it is determined that the posture state is appropriate as indicated by D4, the process proceeds to a pulse wave information measurement process, and the image shown in FIG. 21 is displayed. At this time, when it is determined that the posture is appropriate (when the state becomes D4), the display of the posture state notification image of D4 may be continued for a given wait time. If it is determined in the processing unit 100 that the posture state is appropriate, the processing has shifted to the pulse wave information measurement process. However, when the display of D4 ends in an instant and the display shifts to the display of D5, it is not preferable for the user because there is not enough time to recognize that his / her posture is appropriate. Therefore, even when the posture state becomes appropriate, the display unit 70 continues to display the posture state notification image for a given wait time (for example, 3 seconds), so that the current posture state is appropriate for the user. You may notify that there is.

  The image during the measurement processing of the pulse wave information is as described above with reference to FIG. However, the posture state may not be appropriate during the measurement process. In this case, even if the measurement process is continued in the inappropriate posture state, the accuracy of the appropriate pressing determination process is lowered. Therefore, in this case, it is preferable to once return to the posture state notification image display D4 and instruct the user to take an appropriate posture again. And when it returns to a suitable attitude | position state, a measurement process is restarted again.

  When the measurement process is completed, the change of the load state is instructed as shown in D6, and the same process is repeated in the changed load state. Specifically, posture state notification images D3 and D4 are displayed, and when the posture state is appropriate, the image of D5 is displayed.

  Further, when the measurement process is completed, as described above with reference to FIG. 23, the final result image D7 including the information on the load state that gives the appropriate pressure is displayed. Here, although the example which displays all the measurement process results for every changed load state was described by display D5 and D7, it was not limited to this. For example, in order to understand the peak of the pulse wave amplitude, three measurement processing results having a large amplitude among the changed load states may be displayed on the display D5 or D7, or the previous measurement processing result and this time may be displayed. The measurement processing result may be displayed. That is, it is only necessary to display an image including a measurement processing result with the largest amplitude of the pulse wave in the measurement processing performed while changing the load state.

5. Next, a specific example of the proper pressure determination process performed in the proper posture when the user takes the proper posture by displaying the posture state notification image described above will be described. Note that it is assumed that the above-described normalization graph (FIGS. 20A to 21) displays the amplitude value of an AC component signal, which will be described later.

5.1 Determination of Appropriate Pressure As described above, the signal value of the pulse wave sensor signal varies depending on the user, and therefore there are users who have a relatively large signal value and users who have a relatively small signal value when the pressure is appropriate. become. Therefore, even if only the signal value at the time of a given press is acquired, it is difficult to determine whether the press is an appropriate press based on the signal value. For example, a threshold value that can be used universally for a plurality of users is set even if it is determined whether or not the pressure is an appropriate pressure by comparing the signal value with a given threshold value. Is difficult.

  Therefore, in this embodiment, the pressure on the living body is changed, and the appropriate pressure is determined based on the change characteristic of the pulse wave sensor signal with respect to the pressure change. This is because there are individual differences in the magnitude of the signal value, but the change characteristics of the pulse wave sensor signal have the same tendency for all users. For example, when considering discrete pressure changes, different first to Nth presses are sequentially applied to the living body, and pulse wave sensor signals at each press (in a narrow sense, one pulse per one press). Since the wave sensor signal corresponds, first to Nth pulse wave sensor signals) are acquired. And what is necessary is just to determine which press is an appropriate press among the 1st-Nth presses based on the acquired 1st-Nth pulse wave sensor signal.

  In addition, since the appropriate pressure has a certain range in view of the characteristics of the living body (the range satisfying V1 <V <V2 described above), the pressure determined as the appropriate pressure by the present embodiment is limited to one pressure value. Instead, it may have multiple values or be represented by a given range. By doing in this way, since a user can select a tightening position comfortable for himself / herself within a range of proper pressing, the user's feeling of burden can be reduced even when wearing for a long time.

  In addition, although the pressure change is performed by the user, display control such as displaying an instruction image (for example, FIG. 22) on the display unit 70 is performed in order to realize the change. Here, the determination process based on the acquired pulse wave sensor signal will be described on the assumption that the pressure change is appropriately performed.

  As described above, in the present embodiment, the appropriate pressing is performed in association with the holding state of the load mechanism 300 instead of the physical quantity in units such as kPa. Therefore, in the following description, in order to simplify the description, the appropriate pressure is determined by changing the pressure, but changing the pressure changes the load state (holding state) in the load mechanism 300. In other words, determining the appropriate pressure corresponds to determining the holding state that realizes the appropriate pressure.

5.2 Appropriate pressure determination based on AC component signal As specific determination processing, determination based on an AC component signal corresponding to an AC component of a pulse wave sensor signal will be described. FIG. 25A and FIG. 25B show the change characteristics of the signal value of the AC component signal with respect to the pressure change. However, FIG. 25A is a diagram for explaining a general change tendency of the AC component signal with respect to pressing. The horizontal axis of FIG. 25 (A) and FIG. 25 (B) represents time and is a graph in the pressure reducing direction in which the pressure is lowered with time, as is clear from the time change of the pressure.

  As shown in FIG. 25A, the amplitude of the AC component signal has a small value when the pressure is large, but the amplitude value increases as the pressure is lowered. When the pressure becomes smaller than a given value, the amplitude value starts to decrease. In consideration of the fact that the AC component signal is a signal resulting from the heartbeat and is used for the calculation of pulsation information, a pressing with a large amplitude value of the AC component signal may be determined as an appropriate pressing. For example, in the case of FIG. 25A, the range indicated by I1 is the appropriate pressure.

  That is, when an AC component signal is used, an amplitude value at each press may be calculated, and a press at which the calculated amplitude value increases may be set as an appropriate press. Specific examples are shown in FIGS. 26A and 26B. FIG. 26A shows the time change of the AC component signal when the band hole position is set to a given position, and the unit of the horizontal axis is seconds. The first half of FIG. 26A (a period of about 0 to 10 seconds) is a timing when the band hole position is set, and a period in which the time elapsed from the timing is short. In this period, the signal value of the AC component signal Is not stable, the amplitude value is not calculated. That is, the amplitude value is determined based on a signal value (for example, a signal value in the period J1 in FIG. 26A) after a given time has elapsed after the band is attached.

  Here, the amplitude value may be calculated based on the peak, and either the upper peak or the lower peak may be used. Here, the amplitude value is calculated from both of them. Specifically, the maximum value (upper peak) and the minimum value (lower peak) in one cycle of the AC component signal (corresponding to one beat of the heart) are detected, and the difference value (Peak) between the maximum value and the minimum value is detected. -to-peak) is the amplitude value in the period. As indicated by J1 in FIG. 26A, since it is assumed that the calculation period of the amplitude value is longer than one cycle of the AC component signal, a plurality of difference values are acquired in the calculation period. FIG. 26B is an example of the time variation of the difference value, in which the difference values acquired once for each cycle of the pulsation are arranged in the order of acquisition (the horizontal axis represents the order of acquisition and the second Etc.) In the present embodiment, the average value of the plurality of difference values in the amplitude value calculation period (J1) may be set as the amplitude value at the set band hole position (and the corresponding press).

  The average value may be a simple average value or a trim average value that excludes extremely large (or small) data in the average value calculation. If the trim average value is used, the exclusion range may be set based on the standard deviation σ, for example, 3σ may be used.

  With the above processing, the amplitude value of the AC component signal at a given pressure (band hole position) can be calculated. In the determination of proper pressing, the amplitude value at each pressing may be obtained, and the pressing with the maximum amplitude value may be determined as the proper pressing.

6). Details of Processing The flow of determination processing for proper pressing according to the present embodiment will be described with reference to the flowchart of FIG. Note that although FIG. 27 assumes a biological information detection apparatus that can take five positions as a load state (band position), the present invention is not limited to this.

  When this process is started, first, a message to start the appropriate pressure determination process is displayed on the display unit 70, and the user is notified of the start of the process (S101). Alternatively, this display is not limited to merely notifying the start of processing, but may be an image display for instructing the load state to some extent using the display unit 6135 or the like as in D1 of FIG. It may be an image display for giving an instruction to limit the posture state to some extent, such as 24 D2. If the load state is limited by displaying the image of D1, there is a possibility that the measurement process may not be performed in all the load states that the load mechanism can take, but this point is taken into consideration in the flowchart of FIG. Not.

  Next, an instruction screen for setting the band position to 1 (first load state) is displayed on the display unit (S102), and an initialization process is performed (S103). The initialization process here includes a process of resetting (turning off) the attitude control flag indicating whether or not the attitude state is properly maintained for a certain period, and an inclination corresponding to the time during which the appropriate attitude is maintained. This is a process for setting the normal counter to zero.

  Then, it is determined whether or not the posture can be measured using the posture control flag (S104). If the posture control flag is OFF, posture state notification images such as FIGS. 17A and 17B are displayed ( S105). Note that the case where the attitude control flag is ON in S104 corresponds to a state in which an appropriate attitude is maintained for a certain period, and measurement results (and provisional results) are acquired by processing after S114 described later. A result screen as shown in FIG. 21 is displayed (S106).

  After the process of S105 or S106, an acceleration signal is acquired here as information for determining the posture state (S107). The obtained acceleration is smoothed (for example, moving average processing) (S108), and based on the result, it is determined whether or not the current posture state is appropriate (S109). Specifically, the above-described processing may be performed using θx and θy or acceleration values acquired based on them.

  If it is determined in S109 that the posture state is not appropriate, the process returns to S103. That is, the attitude control flag is turned OFF, and the normal inclination counter is also set to 0. According to the process of FIG. 27, an appropriate posture state is maintained, and if it is determined that the posture state is not an appropriate posture state by the posture state determination of S109 even after the transition to the measurement processing after S114, a flag and a counter Is reset, and the process returns to the process for taking an appropriate posture state again.

  Next, it is determined whether the attitude control flag is ON (S110). If it is ON, the process proceeds to S114 to perform measurement processing. That is, when the posture control flag is turned ON and an appropriate posture state is maintained thereafter, the measurement process is performed by repeating the loop of S104 to S110 and S114 to S117 described later.

  If NO in S110 (the posture control flag is OFF), the current posture state is appropriate, but the predetermined period has not elapsed since the appropriate posture was obtained before that (pulse wave information is stabilized) Corresponds to the case where the time has not passed. Therefore, whether the pulse wave information is considered to be stable by incrementing the normal inclination counter indicating the duration time of the appropriate posture state (S111) and comparing the counter value with a specified time (here, 3 seconds). Is determined (S112).

  If NO in S112, the process returns to S107 to determine the posture state at the next timing. If the posture state is appropriate, the value of the normal inclination counter is increased by repeating the loop of S107 to S112.

  If YES in S112, the appropriate posture state is maintained for a certain period and the pulse wave information is in a state suitable for measurement, so the posture control flag is turned on (S113) and the process proceeds to measurement processing. To do.

  As specific measurement processing, measurement of the amplitude value of the pulse wave signal (S114), provisional result display using the measured amplitude value (S115), and peak detection based on the amplitude value (S116) are performed. Then, it is determined whether 6 points have been acquired for each of the upper peak and the lower peak (S117). If not acquired, the process returns to S104 to check whether an appropriate posture state is maintained. As described above, if an appropriate posture state is maintained, a graph is displayed in S106, YES is determined in S110, and the process returns to S114 again.

  If six peak-to-peaks are acquired in S117, an amplitude average value is acquired from the average value, and the measurement process in the load state (band position) is terminated (S118).

  Next, it is determined whether the band position is 5 (whether measurement has been completed at all band positions) (S119). If NO, the instruction screen shown in FIG. 22 is displayed and the band position is updated. (S120). Furthermore, since there is a possibility of forced termination by the user, it is determined whether or not to end (for example, “Do you want to end?” Is displayed on the display unit 70 and determined based on the user's input) (S121). In the case of ending, an optimum band position (a load state giving an appropriate pressure) is determined using the results so far (S123). At this time, the image shown in FIG. 23 may be displayed together. Further, if YES in S119 (measurement is completed for all bands), the process proceeds to S123, and in this case, the optimum band position is determined using all results.

  If NO in S121, the band state is updated (S122), and the process returns to S103 and continues. Note that S122 is a process for updating the band position information held by the biological information detection apparatus, and does not indicate whether the band position has actually been changed by the user's hand.

  Next, a specific example of the measurement process in S114 to S118 will be described using the flowchart of FIG. When this process is started, a variable MIN representing a lower peak value is first initialized to 0 (S201). Then, pulse wave information (specifically, an AC component signal) at each timing is acquired (S202), and smoothed by taking the moving average of the latest five points (S203).

  Then, a differentiation process is performed on the moving average result (S204). Here, a process for obtaining the difference value of the moving average of two adjacent points is performed. Then, an extreme value is detected using the result of the differentiation process (S205). Specifically, the lower peak of the extreme value is detected, and processing is performed to determine the peak at which the differential value changes from negative to positive (including 0). If an extreme value is detected, an update process is performed with the moving average value at that time as the lower peak value (S206).

  When the lower peak is not detected in S205 or after the update processing in S206, a difference value Wn between the variable MIN at that time and the current moving average value is obtained, and this value is set as the pulse amplitude value (S207). . That is, the latest lower peak value is always held, and the difference between the lower peak value and the current value is used as the pulse amplitude.

  Thereafter, it is determined whether or not to end the process (S208). If YES, the process ends. If NO, the process returns to S202.

7). Modification In the above embodiment, the display image as shown in FIG. 24 is displayed on the display unit 70 of the device main body 2. However, the present invention is not limited to this. For example, an external electronic device having an image display function such as a smartphone or a tablet-type electronic device may perform data communication with the device body 2 in real time to display a display image. With such a configuration, it is possible to adjust the pressure while viewing a larger screen, and it is possible to improve user convenience. Further, by displaying on an external electronic device having a screen larger than the display unit 70 of the device main body 2, it is possible to display additional information together, and it is possible to feed back useful information for the user. It becomes possible.

  Furthermore, although the apparatus main body 2 is configured to include the display unit 70, the configuration is not limited thereto, and may be configured not to include the display unit 70. In this case, as in the first modification, the external electronic device and the device main body 2 may perform data communication in real time and display the same display as the display unit 70 on the external electronic device. By configuring in this way, the size of the device main body 2 can be significantly reduced, so that the user's wearing feeling is greatly improved. In addition, even in an environment where the user always wears the electronic device SP, the burden on the user can be greatly reduced.

  In the above-described embodiment, as shown in FIG. 5, the biological information detection apparatus is configured to detect a pulse wave information detection unit 10 that detects pulse wave information of a subject and a pulse wave information detection unit 10 that presses the subject. The processing unit 100 that performs the measurement processing of the level of the pulse wave information when the first pressed state to the Nth (N is an integer of 2 or more) pressed state, and the first pressed state to the first pressed state. Among the results of the measurement processing of the level of the pulse wave information in the pressed state of N, the display unit 70 displays the measurement results of the first measurement result to the Mth (M is an integer satisfying M ≦ N). Including.

  Here, the level of the pulse wave information may be an amplitude value of the pulse wave information, or a power at a frequency after performing a Fourier transform or the like.

  In the embodiment described above, typically, all the load states that can be taken by the load mechanism 300 are selected one by one, measurement results are acquired in the pressed state corresponding to each load state, and all of them are displayed. It has been described as something to do. That is, when the load mechanism 300 takes the first to Nth load states, the pulse wave information detection unit 10 presses the subject in a first to Nth press state correspondingly. In addition, the first to Nth measurement results are acquired, and all of the measurement results are to be displayed on the display unit 70, but the present invention is not limited to this. A part of the obtained first to Nth measurement results may be displayed. Here, the first to Mth measurement results to be displayed do not mean that the order in which the measurement processing results are acquired is the first to Mth, but is acquired in N pressing states. It means that any M results among the results can be displayed. In the following description of the present specification, as described herein, the first measurement result to the M-th measurement result among the results of the measurement processing in the first to N-th pressed states are shown. It should be noted that when M = N, it goes without saying that it is the same as described above.

  As a result, in the biological information detecting apparatus capable of taking a plurality of pressed states, it is possible to display a plurality of measurement results corresponding to the plurality of pressed states. In the above-described processing for obtaining appropriate pressure, it is necessary to compare pulse wave information actually measured in a plurality of pressed states in order to cope with individual differences. Moreover, even if it is a scene other than the determination of appropriate press, it is useful to display a plurality of measurement results in consideration of the fact that the press state affects the detection accuracy of pulse wave information. Therefore, in this embodiment, the first measurement result to the Mth measurement result are displayed.

  The display unit 70 may display the first measurement result to the M-th measurement result on which the pulse wave information level normalization process has been performed.

  Thereby, for example, the image shown in the upper part of FIG. 23 can be displayed. The absolute value of the pulse wave information may vary greatly for each user, and it is not preferable to determine the scale (for example, the upper and lower limits of the graph axis) as a general value. Specifically, the measured pulse wave information value exceeds the maximum value that can be displayed, or the pulse wave information value is extremely small compared to the graph range, so the difference between multiple measurement results is clear. Or not. Therefore, in the present embodiment, normalization processing shown in FIGS. 20A to 20E and the like is performed to enable appropriate display of measurement results of pulse wave information having a large individual difference.

  Further, the display unit 70 may display the first measurement result to the Mth measurement result on which the normalization processing has been performed according to the maximum value of the level among the first measurement result to the Mth measurement result. Good.

  This makes it possible to perform normalization processing using the maximum value of the level. When the measurement result of the pulse wave information exceeds a displayable value, the displayed value does not reflect the measurement result, and there is a high possibility that the measurement result is misunderstood by the user. In particular, when performing a process for obtaining an appropriate pressure using the method of the present embodiment, it is assumed that a determination method in which a pressed state having a large level is an appropriate pressure is used. It is useful to display values appropriately. However, this does not preclude the use of the minimum value or other values for the normalization process.

  In addition, the measurement result of the level of pulse wave information in the first pressed state to the i-th pressed state (i is an integer satisfying 2 ≦ i ≦ N) is acquired, and the (i + 1) th pressed state to the Nth pressed state is acquired. When the result of the measurement process of the level of pulse wave information in the pressed state has not been acquired, the display unit 70 results of the process of measuring the level of pulse wave information in the first to i-th pressed states. Of the first measurement result to j (j is an integer satisfying j ≦ i) included in the normalization process, the normalization process is performed and the normalization process is performed. The jth measurement result may be displayed.

  Thereby, even if it is a case where only some measurement processes are complete | finished among several press states, it becomes possible to display the result until then. Since the pulse wave information measurement process requires a certain amount of time, there may be a case where the user wants to end the process halfway due to time or the like. For example, if you want to know the pressing state that gives the maximum value of the level (for example, you want to find the appropriate pressing), if the result shows that the level increases to a given pressing state and then starts to decrease, It can be estimated at that time that the point giving the value is the pressed state to be obtained. In other words, by displaying the progress in the middle as appropriate, it is possible to make a judgment by the user based on the display result, and to realize a device that is easier to use. In addition, even in the middle, it is not limited to displaying all the measurement results acquired so far, and a part thereof may be displayed.

  Further, the display unit 70 displays an instruction screen for instructing to change the pressed state to the i + 1th pressed state, and the processing unit 100 starts measurement processing of the level of the pulse wave information in the i + 1th pressed state. When it is, the display unit 70 may display the provisional measurement result of the level of the pulse wave information in the i + 1th pressed state during the measurement process together with the first measurement result to the jth measurement result. .

  At that time, the display unit 70 may perform an animation display that varies in accordance with the variation of the pulse wave information in the (i + 1) th pressed state as the display of the temporary measurement result.

  As a result, since the instruction screen can be displayed, it is possible to update the pressing state and obtain measurement results in many pressing states, and the provisional measurement result corresponding to the pressing state being measured. It becomes possible to display. By displaying the provisional measurement result, it is possible to clearly indicate to the user that the measurement process is being executed in the current pressed state. In addition, as shown in FIG. 21, the measurement result corresponding to the pressing state at that time can be obtained by changing the display using the fluctuation of the actual pulse wave information, even before the end of the measurement process. Can be estimated to some extent, or when an unexpected value (such as extremely large or small) is acquired, it is possible to consider the possibility of an error or the like.

  In addition, the processing unit 100 determines whether the posture state of the subject is appropriate as the posture for performing the pulse wave information measurement process in each of the pressed states from the first pressed state to the Nth pressed state. The display unit 70 may display a posture state notification image that dynamically changes according to a change in the posture state in each of the first pressed state to the Nth pressed state.

  Accordingly, the posture state notification image can be displayed to prompt the user to take an appropriate posture, and as a result, the accuracy of the pulse wave information measurement process can be improved. The appropriate posture state may be, for example, the posture shown in FIG. 19A. As an example, the posture in which the hydraulic head pressure is close to a desired value, or fluctuation of pulse wave information due to exercise or the like A stable posture, etc., in which the problem is suppressed can be considered.

  The display unit 70 may display an image in which the display position of the object representing the posture state changes according to the posture state as the posture state notification image.

  Thereby, since the change in the posture state is reflected in the change in the display position of the object, it becomes possible to instruct the user in the posture state in an intuitively understandable manner. The specific posture state display image may be an image shown in FIG. 17A, FIG. 17B, or the like.

  In addition, the result of the measurement process in the first pressed state to the i-th (i is an integer satisfying 2 ≦ i ≦ N) is acquired, and the measurement process in the (i + 1) th pressed state to the Nth pressed state is acquired. When the processing unit 100 determines that the posture state is appropriate in the (i + 1) th pressed state, the processing unit 100 starts the measurement process in the (i + 1) th pressed state. The display unit 70 measures the measurement results from the first measurement result to the j-th (j is an integer satisfying j ≦ i) included in the measurement processing results in the first to i-th pressed states, and the measurement. You may display the temporary measurement result of the level of the pulse wave information in the i + 1th press state in process.

  Thus, after the determination of whether or not the posture state is appropriate after updating the pressed state, it is possible to perform the measurement process and display the provisional result when the posture state is appropriate. Therefore, even when the pressed state is updated, the measurement process can be performed using an appropriate posture state in each pressed state, so that the accuracy of the measurement process can be improved.

  Further, in the i + 1th pressed state, when the processing unit 100 determines that the posture state is appropriate, the display unit 70 displays the first region in the image corresponding to the state where the posture state is appropriate. An image in which an object is displayed may be continuously displayed as a posture state notification image for a given wait time.

  Accordingly, even when the posture state is appropriate, the image display of FIG. 17B can be continued for a certain period of time, instead of immediately shifting to the display image of FIG. Therefore, it is clearly communicated to the user that the current posture state is appropriate, and as a result, it is possible to maintain the appropriate posture state or to smoothly adjust the posture state thereafter.

  The display unit 70 may display the first measurement result to the jth measurement result and the provisional measurement result in the (i + 1) th press state after the wait time has elapsed.

  Thereby, after the wait time elapses, the display image shown in FIG. 21 or the like is displayed, and it is possible to notify the user that the pulse wave information measurement process is proceeding normally.

  In addition, when the processing unit 100 acquires the result of the measurement process in the (i + 1) th pressed state, the display unit 70 displays an instruction screen for instructing to change the pressed state to the (i + 2) th pressed state. When the pressing state is changed to the i + 2 pressing state according to the instruction screen, the display unit 70 may display the posture state notification image in the i + 2 pressing state.

  As a result, it is possible to start the process after the change of the pressing state after giving an instruction to change the pressing state using the image of FIG. 22 and the like, and to update the pressing state smoothly and the like.

  In addition, the processing unit 100 calculates an appropriate value of the pressure on the subject based on the result of the measurement process of the pulse information acquired in at least two of the first to Nth pressed states. You may perform the appropriate press information acquisition process which calculates | requires the appropriate press information to represent.

  Thereby, it becomes possible to estimate an appropriate press from the measurement result in a some press state. Since the appropriate pressure has a large individual difference, since the estimation process is performed using the actual pulse wave information of each individual, a result corresponding to the individual difference can be obtained. In addition, since a plurality of measurement results are displayed, it is possible to present the measurement results in each pressed state and the relative relationship between them to the user.

  In addition, the first measurement result to the Mth measurement result are the measurement results having at least the maximum level among the results of the measurement processing of the level of the pulse wave information in the first to Nth pressed states. May be included.

  Thereby, even if it is a case where a part of acquired measurement results are made into a display object, it becomes possible to perform an effective display. In particular, in the present embodiment, since a determination process for appropriate pressure is assumed, it is necessary to search for a pressed state in which the level of pulse wave information is large (maximum in a narrow sense). That is, when a part of the acquired measurement result is used, it is possible to appropriately notify the user of the determination state of the appropriate pressure by using the maximum value among them.

  Note that the biological information detection apparatus (or the electronic device SP or the server system SE in FIG. 16) or the like according to the present embodiment may realize part or most of the processing by a program. In this case, the biological information detecting device of the present embodiment is realized by a processor such as a CPU executing a program. Specifically, a program stored in a non-temporary information storage medium is read, and a processor such as a CPU executes the read program. Here, the information storage medium (computer-readable medium) stores programs, data, and the like, and functions as an optical disk (DVD, CD, etc.), HDD (hard disk drive), or memory (card type). It can be realized by memory, ROM, etc. A processor such as a CPU performs various processes according to the present embodiment based on a program (data) stored in the information storage medium. That is, in the information storage medium, a program for causing a computer (an apparatus including an operation unit, a processing unit, a storage unit, and an output unit) to function as each unit of the present embodiment (a program for causing the computer to execute processing of each unit) Is memorized.

  Although the present embodiment has been described in detail as described above, it will be easily understood by those skilled in the art that many modifications can be made without departing from the novel matters and effects of the present invention. Accordingly, all such modifications are intended to be included in the scope of the present invention. For example, a term described at least once together with a different term having a broader meaning or the same meaning in the specification or the drawings can be replaced with the different term in any part of the specification or the drawings. Further, the configuration and operation of the biological information detection device and the like are not limited to those described in the present embodiment, and various modifications can be made.

NW network, SE server system, SP electronic device, WA device,
2 device body, 4, 5 band member, 6 connecting member, 10 pulse wave information detection unit,
11 Pulse wave sensor, 15 Filter processing part, 16 A / D conversion part, 17 Convex part,
18 LED, 19 photodiode, 20 body movement information detection unit,
21 acceleration sensor, 22 pressure sensor, 26 A / D converter,
43, 53 telescopic part, 61 fixing member, 62 slide member,
63 Protruding rod, 65 Coil spring, 70 Display unit, 80 External I / F unit, 90 Storage unit,
100 processing unit, 110 signal processing unit, 111 pulse wave signal processing unit,
113 body motion signal processing unit, 115 body motion noise reduction unit, 119 proper pressure determination unit,
120 beat information calculation unit, 130 display control unit, 140 time measurement unit, 200 left wrist,
300 load mechanism, 302 guide, 400 base part, 431, 432 connection part,
435, 436 slit, 611 base, 612, 613 extension,
621, 622 first side, 623, 624 second side, 6121 insertion hole,
6122 locking part, 6123 convex part, 6124 oblong hole, 6135 display part,
6136 Positioning piece, 6137 hole

Claims (15)

A pulse wave information detector for detecting pulse wave information of the subject;
Measurement of the level of the pulse wave information when the pressure of the pulse wave information detecting unit on the subject is in a pressed state from a first pressed state to an Nth (N is an integer of 2 or more) pressed state. A processing unit for processing;
Of the results of the measurement process of the level of the pulse wave information in the first pressed state to the Nth pressed state, the first measured result to the Mth (M is an integer satisfying M ≦ N). A display for displaying the measurement results of
A biological information detection device comprising: In claim 1,
The display unit
The living body information detection apparatus displaying the first measurement result to the Mth measurement result in which the level normalization processing of the pulse wave information is performed. In claim 2,
The display unit
The first measurement result to the Mth measurement result on which the normalization processing has been performed is displayed according to the maximum value of the level among the first measurement result to the Mth measurement result. A biological information detection apparatus. In claim 3,
The result of the measurement processing of the level of the pulse wave information in the first pressed state to the i-th (i is an integer satisfying 2 ≦ i ≦ N) is acquired, and the i + 1th pressed state to the When the result of the measurement process of the level of the pulse wave information in the Nth pressed state is not acquired,
The display unit
The level among the measurement results of the first measurement result to the j-th (j is an integer satisfying j ≦ i) included in the measurement processing result in the first press state to the i-th press state. The biological information detection apparatus, wherein the normalization process is performed with a maximum value of the first and the first measurement result to the jth measurement result on which the normalization process has been performed is displayed. In claim 4,
The display unit
An instruction screen for instructing to change the pressing state to the i + 1th pressing state is displayed.
In the processing unit, when the measurement processing of the level of the pulse wave information in the i + 1th pressed state is started,
The display unit
The living body information detection apparatus displaying the first measurement result to the jth measurement result together with the temporary measurement result of the level of the pulse wave information in the i + 1th pressed state during the measurement process. . In claim 5,
The display unit
The living body information detecting apparatus characterized by performing animation display which changes corresponding to the change of the pulse wave information in the i + 1th press state as the display of the temporary measurement result. In any one of Claims 1 thru | or 6.
The processor is
A determination process is performed to determine whether the posture state of the subject is appropriate as the posture for performing the measurement processing of the pulse wave information in each of the first pressed state to the Nth pressed state. ,
The display unit
The biometric information detection apparatus that displays the posture state notification image that dynamically changes in accordance with a change in the posture state in each of the first pressed state to the Nth pressed state. In claim 7,
The display unit
A biological information detecting apparatus, wherein an image in which a display position of an object representing the posture state changes according to the posture state is displayed as the posture state notification image. In claim 8,
The result of the measurement process in the first pressed state to i-th (i is an integer satisfying 2 ≦ i ≦ N) is acquired, and the i + 1th pressed state to the Nth pressed state is acquired. In the case where the result of the measurement process is not acquired and the processing unit determines that the posture state is appropriate in the i + 1th pressed state,
The processor is
Start the measurement process of the level of the pulse wave information in the i + 1th pressed state,
The display unit
Measurement results of the first measurement result to jth (j is an integer satisfying j ≦ i) included in the measurement processing result in the first pressed state to the i-th pressed state, and during the measurement processing A biological information detection apparatus that displays a provisional measurement result of the level of the pulse wave information in the i + 1th pressed state. In claim 9,
In the i + 1th pressed state, when the processing unit determines that the posture state is appropriate,
The display unit
An image in which the object is displayed is continuously displayed as the posture state notification image for a given wait time in a first region in an image corresponding to a state in which the posture state is appropriate. Biological information detecting device. In claim 10,
The display unit
The biological information detection apparatus, wherein after the wait time has elapsed, the first measurement result to the jth measurement result and the provisional measurement result in the (i + 1) th pressed state are displayed. In any of claims 9 to 11,
In the processing unit, when the result of the measurement process in the (i + 1) th pressed state is acquired,
The display unit
An instruction screen for instructing to change the pressing state to the i + 2 pressing state is displayed,
When the pressing state is changed to the i + 2 pressing state according to the instruction screen,
The display unit
The biological information detection apparatus displaying the posture state notification image in the i + 2 pressed state. In any one of Claims 1 to 12,
The processor is
Based on the result of the measurement process of the pulse information acquired in at least two of the first to Nth pressed states, the appropriate value of the pressure on the subject is represented. A biological information detection apparatus that performs an appropriate pressing information acquisition process for obtaining appropriate pressing information. In any one of Claims 1 thru | or 13.
The first measurement result to the Mth measurement result are at least the level among the results of the measurement processing of the level of the pulse wave information in the first pressed state to the Nth pressed state. A biological information detection apparatus including a maximum measurement result. A pulse wave information acquisition unit for acquiring pulse wave information of the subject;
Measurement of the level of the pulse wave information when the pressure of the pulse wave information detecting unit on the subject is in a pressed state from a first pressed state to an Nth (N is an integer of 2 or more) pressed state. A processing unit for processing;
Of the results of the measurement process of the level of the pulse wave information in the first pressed state to the Nth pressed state, the first measured result to the Mth (M is an integer satisfying M ≦ N). As a display control unit that performs control to display the measurement result of
A program characterized by operating a computer.