JP5092482B2 - Biological information detection apparatus, biological information detection apparatus control method, and control program - Google Patents

Description

  The present invention relates to a biological information detection apparatus, a biological information detection apparatus control method, and a control program, and more particularly, a biological information detection apparatus and biological information detection apparatus that detect user biological information by detecting a user's pulse wave signal. The present invention relates to a control method and a control program.

2. Description of the Related Art Conventionally, a portable pulsometer (biological information detection device) configured to detect a pulse wave signal using an optical sensor or the like and extract a signal corresponding to a pulse from the pulse wave signal to obtain a pulse rate. It is known (see, for example, Patent Document 1). If such a portable pulse meter is used, the user's pulse rate can be measured in real time during jogging or the like. The pulse rate is a measure of the exercise intensity, and the exercise amount can be easily managed by exercising while measuring the pulse rate. Further, by exercising while managing the pulse rate, it is possible to prevent the pulse rate during the exercise from being extremely increased, and it is possible to perform the exercise more safely.
JP-A-10-258040

  By the way, the above-described conventional pulse meter (for example, Patent Document 1) is configured to detect a pulse wave signal by irradiating a finger blood vessel with an optical sensor and receiving reflected light reflected from the blood vessel. . When extracting a signal corresponding to a pulse from a pulse wave signal, a process such as removing a noise component from the pulse wave signal is performed. However, if the noise component increases, the pulse rate cannot be calculated correctly. For this reason, the conventional pulse meter detects the SN state of the pulse wave signal, and stops displaying the pulse rate when a noise component exceeding a predetermined value is included.

On the other hand, there is a decrease in outside air temperature as one of the causes of the deterioration of the SN state of the pulse wave signal. When the outside air temperature falls to, for example, 5 ° C. or lower, blood vessels near the body surface contract and blood flow decreases. For this reason, when the outside air temperature is low, the signal level of the pulse wave signal itself decreases, and the pulse wave signal cannot be detected correctly. In such a case, for example, if the user warms the finger by wearing gloves or the like, the blood vessel can be prevented from contracting, and the pulse rate can be correctly calculated by increasing the signal level of the pulse wave signal. Can be.
However, in the conventional pulse meter, when the SN state deteriorates, the display of the pulse rate is stopped, so the user cannot grasp the cause of the display of the pulse rate being stopped. It was not possible to take appropriate measures.
An object of the present invention is to inform the user of the cause when the pulse wave detection signal cannot be detected correctly due to at least a decrease in the outside air temperature, etc., and the user takes an appropriate countermeasure. An object of the present invention is to provide a living body information detecting apparatus, a living body information detecting apparatus control method and a control program.

In order to solve the above-described problems, a biological information detection apparatus according to the present invention includes a pulse wave signal detection unit that is attached to a user and detects a user's pulse wave signal, and an SN state detection unit that detects an SN state of the pulse wave signal. An SN state determination unit that determines whether or not the SN state is better than a predetermined reference state, and the pulse wave signal detection unit when it is determined that the SN state is not better than the reference state A temperature discriminating unit that discriminates whether or not the ambient temperature is lower than a predetermined reference temperature; and a temperature around the pulse wave signal detection unit when the ambient temperature around the pulse wave signal detection unit is lower than the reference temperature And a notification unit that notifies that the pulse wave signal cannot be detected correctly because the temperature is lower than a predetermined reference temperature.
Here, the temperature around the pulse wave signal detection unit may be the outside air temperature around the pulse wave signal detection unit, or may be the body surface temperature around the part where the pulse wave signal detection unit is mounted. .
According to the above configuration, the pulse wave signal detection unit can detect the user's pulse wave signal. In addition, the SN state determination unit can determine whether the SN state detected by the SN state detection unit is better than a predetermined reference state. Then, when it is determined that the SN state is not better than the reference state, the temperature determination unit determines whether or not the temperature around the pulse wave signal detection unit is lower than a predetermined reference temperature, and the pulse wave signal When the temperature around the detection unit is lower than the predetermined reference temperature, the notification unit notifies that the pulse wave signal cannot be detected correctly because the temperature is lower than the predetermined reference temperature. Therefore, when the user's body surface temperature decreases and the SN state deteriorates due to at least a decrease in the outside air temperature, and the pulse wave signal cannot be detected correctly, the pulse wave signal is correctly The cause that cannot be detected can be notified. If the user is informed that the pulse wave signal cannot be detected correctly due to a decrease in outside air temperature, etc., the user can take appropriate measures such as wearing gloves and continue to detect the pulse wave signal. Can be done.

In the above configuration, when the temperature determination unit determines whether the signal level of the pulse wave component extracted from the pulse wave signal is lower than a predetermined reference level, and the signal level is lower than the reference level In addition, it may be configured to determine that the temperature around the pulse wave signal detection unit is lower than the reference temperature.
According to the above configuration, the temperature discrimination unit determines whether the temperature around the pulse wave signal detection unit is higher than the reference temperature depending on whether the signal level of the pulse wave component extracted from the pulse wave signal is lower than a predetermined reference level. Whether it is low or not can be determined. In this case, the body surface temperature around the pulse wave signal detector can be mainly determined. Therefore, it is not necessary to provide a new component for detecting the temperature around the pulse wave signal detection unit, and the temperature around the pulse wave signal detection unit can be determined without increasing the cost.

Further, in the above configuration, a temperature sensor that detects a temperature around the pulse wave signal detection unit is provided, and the temperature determination unit has a signal level of a pulse wave component extracted from the pulse wave signal that is lower than a predetermined reference level. Whether the temperature around the pulse wave signal detection unit is lower than the reference temperature based on the temperature detected by the temperature sensor when the signal level is lower than the reference level. It can also be configured to determine whether or not.
According to the above configuration, when it is determined that the signal level of the pulse wave component extracted from the pulse wave signal is lower than the predetermined reference level, the surroundings of the pulse wave signal detection unit are based on the temperature detected by the temperature sensor. Since it is configured to determine whether or not the temperature is lower than the reference temperature, it is possible to more reliably determine whether or not the temperature around the pulse wave signal detection unit is lower than the reference temperature.
Here, the temperature sensor is preferably arranged around the pulse wave signal detection unit, and the temperature around the pulse wave signal detection unit detected by the temperature sensor may be the outside air temperature around the pulse wave signal detection unit. The body surface temperature around the part to which the pulse wave signal detection unit is attached may be used, but it is more preferable that the body surface temperature around the part to which the pulse wave signal detection unit is attached is detected. It is good also as a structure which detects the body surface temperature around the site | part to which the pulse wave signal detection part was mounted | worn by detecting the external temperature around a wave signal detection part.

Further, in the above configuration, a temperature sensor disposed around the pulse wave signal detection unit and detecting a temperature around the pulse wave signal detection unit is provided, and the temperature determination unit is based on the temperature detected by the temperature sensor. Thus, it may be configured to determine whether or not the temperature around the pulse wave signal detection unit is lower than the reference temperature.
According to the above configuration, it is possible to determine whether the temperature around the pulse wave signal detection unit is lower than the reference temperature based on the temperature detected by the temperature sensor arranged around the pulse wave signal detection unit. .

Further, in the above configuration, the apparatus includes a storage unit that stores advice information indicating a coping method for correctly detecting the pulse wave signal when the temperature around the pulse wave detection unit is lower than the reference temperature. Preferably, when the determination unit determines that the temperature around the pulse wave detection unit is lower than the reference temperature, the notification unit notifies the advice information.
According to the above configuration, for example, as advice information, if the temperature around the pulse wave detection unit is lower than the reference temperature, the temperature around the pulse wave detection unit should be kept warm so that the pulse wave signal can be detected correctly. Therefore, even if the outside air temperature is low, it is possible to notify the user of an appropriate coping method and to correctly detect the user's pulse wave signal.

Further, in the above configuration, a temperature change detection unit that detects a temperature change around the pulse wave signal detection unit over time, and the pulse after a predetermined time based on the temperature change detected by the temperature change detection unit. A temperature change prediction unit that predicts whether or not the temperature around the wave signal detection unit is lower than the reference temperature, and the notification unit is configured to detect the pulse wave signal after the predetermined time by the temperature change prediction unit. When the temperature around the detection unit is predicted to be lower than the reference temperature, the pulse wave signal may not be correctly detected due to a temperature drop around the pulse wave signal detection unit after the predetermined time. It is preferable to notify that there is.
According to this configuration, when the temperature around the pulse wave signal detection unit becomes lower than the reference temperature after a predetermined time based on the temperature change around the pulse wave signal detection unit with the passage of time detected by the temperature change detection unit. If predicted, the user is informed in advance that the pulse wave signal may not be correctly detected due to a temperature drop, so the user should take appropriate measures such as preparing gloves in advance. It can be carried out.

In addition, the biological information detection apparatus of the present invention includes a pulse wave signal detection unit that is attached to a user and detects a user's pulse wave signal, and a temperature change that detects a temperature change around the pulse wave signal detection unit over time. Based on the temperature change detected by the detection unit and the temperature change detection unit, a temperature change prediction for predicting whether or not the temperature around the pulse wave signal detection unit becomes lower than a predetermined reference temperature after a predetermined time And when the temperature change predicting unit predicts that the temperature around the pulse wave signal detecting unit is lower than the reference temperature after the predetermined time, the temperature around the pulse wave signal detecting unit around the predetermined time A notifying unit for notifying that the pulse wave signal may not be correctly detected due to a temperature drop.
According to this configuration, when the temperature around the pulse wave signal detection unit becomes lower than the reference temperature after a predetermined time based on the temperature change around the pulse wave signal detection unit with the passage of time detected by the temperature change detection unit. If predicted, the notification unit notifies the user in advance that the pulse wave signal may not be correctly detected due to a temperature drop, so the user should prepare gloves beforehand. Can respond.

Further, in the above configuration, the apparatus includes a storage unit that stores advice information indicating a coping method for correctly detecting the pulse wave signal when the temperature around the pulse wave detection unit is lower than the reference temperature. When the change prediction unit predicts that the temperature around the pulse wave detection unit is lower than the reference temperature, it is preferable that the notification unit notifies the advice information.
In this way, when the temperature around the pulse wave detection unit is predicted to be lower than the reference temperature, advice information indicating a coping method for correctly detecting the pulse wave signal is notified from the notification unit, so the user can Appropriate responses can be taken.

  The biological information detection apparatus control method according to the present invention includes a biological information detection apparatus that includes a pulse wave signal detection unit that is worn by a user and detects a user's pulse wave signal, and a notification unit that notifies predetermined information. A control method of a biological information detection apparatus for controlling, wherein a pulse wave signal detection process for causing the pulse wave signal detection unit to detect a pulse wave signal of the user, and an SN for detecting an SN state of the pulse wave signal When it is determined that a state detection process, an SN state determination process for determining whether the SN state is better than a predetermined reference state, and the SN state is not better than the reference state, the pulse wave A temperature determination process for determining whether or not a temperature around the signal detection unit is lower than a predetermined reference temperature; and when the temperature around the pulse wave signal detection unit is lower than the reference temperature, the pulse wave signal detection unit The ambient temperature is the specified reference temperature Characterized in that it comprises a notifying step for notifying not correctly detect the pulse wave signals for lower to the notification portion.

In addition, the control program of the present invention controls a biological information detection apparatus including a pulse wave signal detection unit that is attached to a user and detects a user's pulse wave signal and a notification unit that notifies predetermined information using a computer. The pulse wave signal detection unit detects the pulse wave signal of the user, detects the SN state of the pulse wave signal, and is the SN state better than a predetermined reference state? If the SN state is determined not to be better than the reference state, it is determined whether the temperature around the pulse wave signal detection unit is lower than a predetermined reference temperature, When the temperature around the pulse wave signal detection unit is lower than the reference temperature, the notification unit is notified that the pulse wave signal cannot be detected correctly because the temperature around the pulse wave signal detection unit is lower than a predetermined reference temperature. Let And butterflies.
In this case, the control program may be recorded on a computer-readable recording medium.

  According to the present invention, when the SN state deteriorates due to at least a decrease in the outside air temperature and the pulse wave signal cannot be detected correctly, the user is notified of the reason why the pulse wave signal cannot be detected correctly. can do.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is an explanatory diagram of the appearance of the biological information detection apparatus 1 according to the present embodiment in use. The biological information detection apparatus 1 according to the present embodiment is formed in a wristwatch shape in which the apparatus main body 2 is attached to the wristband 3, and the user wraps the wristband 3 around the wrist so that the biological information detection apparatus 1 is wound. 1 can be worn on the wrist.
The biological information detection apparatus 1 includes a biological sensor unit 4 (pulse wave signal detection unit) that is attached to a user's finger (small finger in the illustrated example) and detects a user's pulse wave signal, and is detected by the biological sensor unit 4. The pulse rate is obtained by extracting a pulse wave component that is a signal corresponding to a pulse from the pulse wave signal.

The biological information detection apparatus 1 according to the present embodiment has a function of determining whether or not the pulse rate can be correctly measured, and whether or not the pulse rate can be correctly measured. In order to discriminate between them, the outside air temperature is detected by the temperature sensor 5 arranged outside the living body sensor unit 4. This is because, when the outside air temperature drops to 5 ° C or less, for example, the blood vessels of the finger near the body surface tend to contract, and the blood flow rate decreases, and the pulse wave signal may not be detected correctly. This is because it is determined whether or not the cause of the failure is the decrease in the body surface temperature accompanying the decrease in the outside air temperature. The processing relating to the determination of whether or not the pulse rate can be correctly measured will be described later. However, in the present embodiment, the ambient temperature is directly detected by the temperature sensor 5 as the ambient temperature of the biosensor unit 4, and the body surface temperature of the finger on which the biosensor unit 4 is mounted based on the ambient temperature. It is set as the structure which estimates. The biosensor unit 4 and the apparatus main body 2 are electrically connected via a cable 6, and various signals including a pulse wave signal and a temperature detection signal detected by the temperature sensor 5 can be transmitted and received between them. It has become.
Furthermore, the living body information detection apparatus 1 according to the present embodiment detects a temperature change around the living body sensor unit 4 over time based on the temperature detected by the temperature sensor 5, and based on the temperature change, a predetermined amount is detected. When it has a function of predicting whether or not the temperature around the biosensor unit 4 will decrease after a time, and when it is predicted that the temperature around the biosensor unit 4 will decrease, as will be described later, The user is notified in advance so that the user can respond in advance.

  As shown in FIG. 1, switches S <b> 1, S <b> 2, S <b> 3, and S <b> 4 used for a user to perform various operations are arranged on the outer peripheral surface 20 of the apparatus main body 2 of the biological information detection apparatus 1 from the outer peripheral surface 20 to the outside of the apparatus main body 2. Are provided so as to protrude from each other. The user can input operation instructions associated with the switches S1, S2, S3, and S4 by pressing the switches S1, S2, S3, and S4 to the apparatus body 2 side. Has been. In this embodiment, the switches S1, S2, S3, and S4 are configured using a press-type mechanical contact type, but are configured using an electrostatic type or a touch type switch using a membrane electrode. Also good.

  In the following, for convenience of explanation, as shown in FIG. 1, the longitudinal direction (length direction) of the wristband 3 is set to the 12 o'clock to 6 o'clock direction of the watch, and the short direction (width direction) of the wristband 3 is set. It is assumed that the apparatus main body 2 is attached to the wristband 3 so as to be in the 3 o'clock to 9 o'clock direction of the timepiece. When the wristband 3 is wound around the user's left wrist and the user wears the biological information detection device 1, the wristband 3 is in the longitudinal direction of the wristband 3 and the user's little finger side as shown by an arrow in the figure. Is the 12 o'clock direction of the watch, the thumb side is the 6 o'clock direction, the width direction of the wristband 3, the user's fingertip side is the 3 o'clock direction of the watch, and the user's shoulder side is the 9 o'clock of the watch. Time direction. Based on this, the external configuration of the apparatus main body 2 will be further described.

In FIG. 2, the external appearance front view of the apparatus main body 2 of the biometric information detection apparatus 1 is shown.
When the wristband 3 side of the apparatus main body 2 is the back side and the opposite side is the front side, as shown in FIG. Is displayed. On the periphery of the display portion 22 (the periphery portion 21), switch function descriptions of the switches S1, S2, S3, and S4 are displayed in the vicinity of the arrangement positions of the switches S1, S2, S3, and S4, respectively. Switch function explanation display areas 23A, 23B, 23C, and 23D are provided.

  The display unit 22 has two display areas divided into a 12 o'clock direction side and a 6 o'clock direction side in the 12 o'clock to 6 o'clock direction of the timepiece in a front view. The display area on the 12 o'clock side is a dot matrix display area 22A, and a pulse wave waveform, a pitch waveform, an operation mode announcement, and the like are graphically displayed on the dot matrix display area 22A. The display area on the 6 o'clock side (lower side) is a segment display area 22B. In this segment display area 22B, information such as time, target pulse rate, pulse rate, and pitch is displayed in segments.

The switch function explanation display area 23A is an area in which character information for briefly explaining the function of the switch S1 is displayed. For example, the letters “setup” are written. Similarly, in the switch function explanation display area 23B, for example, “UP / Light” is written, and in the switch function explanation display area 23C, for example, “DOWN / result display” is written. In the switch function description display area 23D, for example, “start / stop” is written.
In addition, a body motion sensor 24 for obtaining a user's pitch during walking or running and a control board (not shown) to which the cable 6 is connected are built in the apparatus main body 2.

  As shown in FIG. 2, a switch S <b> 1 is provided on the 6 o'clock side of the side end face 20 </ b> A on the other side (3 o'clock direction in the illustrated example) of the apparatus main body 2 in a front view. The user can input a setup start instruction, an operation mode change instruction, and the like via the switch S1. A cable through hole 25 is formed on the same side end face 20A on the 12 o'clock side, and one end of the cable 6 extends from the cable through hole 25.

Further, in the front view, the 12:00 side of the side end face 20B on one side of the apparatus main body 2 functions as a count-up key when various numerical values such as time are set. When the numerical value is not set, the display unit 22 is written. A switch S2 is provided that functions as a switch for up.
For example, when setting the time, the user sets the operation mode to the time setup mode by pressing the switch S1 in the 9 o'clock direction, and then selectively presses the switches S2 and S3 in the 3 o'clock direction. The time can be set.
Furthermore, on the side of the same side end face 20B at 6 o'clock, it functions as a countdown key when various numerical values are set, and when the numerical value is not set, measurement results (calculation results) such as pulse rate are displayed on the display unit 22. The switch S3 is provided. However, as described above, the biological information detection apparatus 1 has a function of determining whether or not the pulse rate can be correctly measured, and it is determined that the pulse rate cannot be measured correctly. If the cause is due to a decrease in the outside air temperature, instead of displaying the measurement result such as the pulse rate, the user is informed that the outside air temperature is decreasing, and urges the user to wear gloves. A countermeasure for allowing the number to be measured correctly is displayed on the display unit 22.

In addition, a charging terminal 26 and a communication terminal 27 are provided between the switch S2 and the switch S3 provided on the side end face 20B, and the apparatus main body 2 is mounted on a dedicated cradle (not shown). In this case, the apparatus main body 2 and the terminals provided on the cradle are electrically connected via these terminals. When the apparatus main body 2 is attached to the dedicated cradle, the apparatus main body 2 is supplied with electric power via the charging terminal 26 and charges a rechargeable battery (not shown) built in the apparatus main body 2. When an external device such as a personal computer is connected to the dedicated cradle directly or via a network, the apparatus main body 2 can communicate with the external device via the communication terminal 27. Yes.
In this embodiment, since the charging terminal 26 and the communication terminal 27 are provided on the side end face 20B on the 9 o'clock side of the apparatus main body 2, when connecting the dedicated cradle and the apparatus main body 2, the wristband 3 and the apparatus The cable 6 provided on the side end face 20A on the 3 o'clock side of the main body 2 can be connected without obstruction.

  Furthermore, a switch S4 for starting / stopping measurement of biological information such as a pulse and a pitch is disposed at the approximate center of the side end face 20C on the 6 o'clock side of the apparatus main body 2. If the user presses the switch S4, the user can execute basic functions of the biological information detection apparatus 1 such as pulse measurement and pitch measurement. In addition, the switch S4 is the switch that is most important and frequently pressed among the switches provided in the apparatus main body 2. Therefore, the switch S4 is formed larger than the other switches S1, S2, and S3. The switches S1, S2, and S3 are formed in a different color. Accordingly, the switch S4 is more conspicuous than the other switches S1, S2, and S3, and the user can easily understand that the switch S4 is an important switch. Furthermore, the switch S4 is provided at a location where the user can easily press the thumb with the thumb of the right hand, for example, when the user wears the biological information detection device 1 on the left wrist and bends the left arm close to the body. User operability can be improved.

  Next, the configuration of the biosensor unit 4 will be described. FIG. 3 is a partial cross-sectional view schematically showing the configuration of the biosensor unit 4. As shown in FIG. 3, the biosensor unit 4 is disposed on both sides of the pulse wave detection mechanism 40 for detecting a pulse wave and the pulse wave detection mechanism 40 in a cross-sectional view in order to detect a user's pulse rate. It has a ground electrode 41 and a sensor fixing band 42 for fixing the pulse wave detection mechanism 40 to the user's finger, and the sensor fixing band 42 is closer to the base of the finger than the second joint of the user's finger. Is wrapped around your finger. The sensor fixing band 42 is wound in a state of being covered with the pulse wave detection mechanism 40 and blocks external light entering the pulse wave detection mechanism 40.

The pulse wave detection mechanism 40 is mounted on the circuit board 43 to which the cable 6 is connected, the LED 44 mounted on the circuit board 43 and having an emission wavelength range of 300 nm to 700 nm, and the circuit board 43. In addition, the phototransistor 45 having a light receiving wavelength region of 700 nm or less and the LED 44 and a glass plate 46 that covers the upper surface of the phototransistor 45 are provided.
Here, as shown in FIG. 3, the pulse wave detection mechanism 40 is fixed to the user's finger by the sensor fixing band 42 so that the glass plate 46 is in contact with the finger.

  The pulse wave detection mechanism 40 is configured to detect a pulse wave by irradiating light from the LED 44 toward the blood vessel of the finger and receiving light reflected from the blood vessel by the phototransistor 45. That is, since hemoglobin in the blood has light absorption characteristics, the change in the amount of received light in the phototransistor 45 corresponds to the change in blood flow (blood pulse wave), and the amount of received light decreases when the blood flow is large. When the amount of blood flow is small, the amount of received light is high, so that a pulse wave can be detected by a change in the amount of received light. In detecting the pulse wave, the present embodiment uses an LED 44 whose emission wavelength region is in the range of 300 nm to 700 nm and a phototransistor 45 mounted on the circuit board 43 and having a light reception wavelength region of 700 nm or less. . As a result, among the light included in the external light, light having a wavelength region of 700 nm or less does not reach the phototransistor 45 using the finger as a light guide, whereas most of light of 300 nm or less is absorbed by the skin surface. Therefore, it is possible to detect a pulse wave without being affected by direct sunlight.

  In addition, the pulse wave is detected using the ground potential as a reference potential. In this embodiment, the ground electrode 41 is provided on both sides of the pulse wave detection mechanism 40, whereby the biological ground potential is set at a fixed position of the pulse wave detection site. Thus, the potential of the ground electrode 41 is stabilized. The sensor fixing band 42 is formed of a conductive member and is connected to the ground electrode 41. For this reason, the sensor fixing band 42 is also used as a shield member that prevents noise from entering the pulse wave detection mechanism 40.

As described above, the biosensor unit 4 is attached to the base side of the second joint of the user's finger. However, the biosensor unit 4 according to the present embodiment is, in particular, the user's little finger or ring finger. It is attached to the base side of the second joint. Thereby, the following effects are obtained.
That is, as shown in FIGS. 1 and 2, since the cable 6 extends from the side end face 20A closest to the ring finger and little finger in the apparatus main body 2, the biosensor unit 4 is attached to the base of the ring finger or little finger. In this case, the length of the cable 6 can be short, and the slack or looseness of the cable 6 can be prevented. Furthermore, when the user presses the switches S1, S2, S3, and S4 of the apparatus main body 2 with the finger of the right hand while the biological information detection device 1 is attached to the left wrist, the finger of the user's right hand is connected to the cable 6 Crossing is prevented and each switch S1, S2, S3, S4 can be pressed. For this reason, the cable 6 is not accidentally pulled during the operation, and noise is not generated or the cable 6 is not cut.

In daily life, the ring finger and the little finger have fewer opportunities to move the finger than other fingers. Therefore, the number of times the cable 6 is bent can be reduced by attaching the biosensor unit 4 to the ring finger and the little finger. When the number of times of bending of the cable 6 is large, it is necessary to design the cable 6 thickly in preparation for damage to the cable 6 due to bending. However, the cable 6 according to the present embodiment has a small number of times of bending because of the above reasons. 6 can be designed to be thin, and the storage property and wearing feeling can be improved. In addition, it is possible to prevent the cable 6 from being damaged by a finger operation performed without the user's awareness, such as an operation in which the user unconsciously contacts the tip of the thumb and the middle finger (for example, an operation for generating a finger flute).
Furthermore, the movement of the finger with the biosensor unit 4 causes noise due to body movement, but the ring finger or little finger moves less than the other finger, so the biosensor unit 4 is moved to the ring finger. Or it can suppress generation | occurrence | production of the noise by body movement by mounting | wearing with a little finger.

  FIG. 4 is a block diagram showing a functional configuration of the biological information detection apparatus 1. The biological information detection apparatus 1 includes a pulse wave data processing unit 51 that obtains a pulse rate based on the pulse wave signal input from the biological sensor unit 4, and a pitch based on the body motion signal input from the body motion sensor 24. A required pitch data processing unit 52, a clock generation unit 53 that generates an operation clock signal, an input unit 54 to which various operation instruction signals are input, a notification unit 55 that notifies various information to the user, and an external device The communication part 56 which performs communication, and the control part (SN state detection part, SN state determination part, temperature determination part, temperature change detection part, temperature change prediction part) 57 which control these are provided.

The pulse wave data processing unit 51 includes a pulse wave signal amplification circuit 51 a and a pulse wave waveform shaping circuit 51 b, and shares the A / D conversion circuit 51 c with the pitch data processing unit 52.
The pulse wave signal amplification circuit 51a outputs a pulse wave amplification signal obtained by amplifying the pulse wave signal output from the biological sensor unit 4 to the A / D conversion circuit 51c and the pulse wave waveform shaping circuit 51b. The pulse wave waveform shaping circuit 51 b performs waveform shaping of the pulse wave amplification signal and outputs it to the control unit 57.
The A / D conversion circuit 51c performs A / D conversion of the pulse wave amplification signal and outputs the pulse wave data to the control unit 57.

The pitch data processing unit 52 includes a body motion signal amplification circuit 52a and a body motion waveform shaping circuit 52b, and shares the A / D conversion circuit 51c with the pulse wave data processing unit 51 as described above.
The body motion signal amplification circuit 52a outputs a body motion amplification signal obtained by amplifying the body motion signal input from the body motion sensor 24 to the A / D conversion circuit 51c and the body motion waveform shaping circuit 52b. The body motion waveform shaping circuit 52 b performs waveform shaping of the body motion amplification signal and outputs the waveform to the control unit 57. The A / D conversion circuit 51c performs A / D conversion of the body motion amplification signal and outputs it to the control unit 57 as body motion data.

Further, the A / D conversion circuit 51 c performs A / D conversion of the temperature detection signal input from the temperature sensor 5 and outputs the detected temperature data to the control unit 57.
Here, as the temperature sensor 5, a thermistor, a platinum resistance thermometer resistance pair, or the like can be used.

  The clock generator 53 outputs an oscillation circuit 53a that outputs a clock signal having a predetermined frequency (for example, 32.768 kHz), and a frequency dividing circuit 53b that divides the clock signal from the oscillation circuit 53a and outputs a 1 Hz clock signal to the CPU 57a. The CPU 57a performs a time measurement process based on a 1 Hz clock signal.

  The input unit 54 corresponds to the switches S1, S2, S3, and S4 described above, and a signal corresponding to each switch operation of the user is input to the CPU 57a via the input unit 54. Moreover, it is comprised so that a part of user information as an parameter | index which shows a user's athletic ability may be input by operating using switch S1, S2, S3, S4 mentioned above.

The alerting | reporting part 55 alert | reports various information, such as a user's pulse rate, to the user, and is provided with the display part 22 and the warning part 55a.
The display unit 22 has the dot matrix display region 22A and the segment display region 22B as described above, and displays various information such as the user's pulse rate and pitch under the control of the control unit 57, and the outside air temperature is When the pulse rate of the user cannot be measured correctly, a display for notifying the user of that fact or a display prompting the user to wear gloves is performed.

  The warning unit 55a outputs various warning sounds under the control of the control unit 57. For example, when it is determined that the user's pulse rate cannot be measured correctly, the warning unit 55a outputs a warning sound to the user. Output.

  The communication unit 56 transmits / receives data to / from an external device connected via the communication terminal 27 under the control of the control unit 57.

The control unit 57 includes a CPU 57a, a RAM 57b, a ROM (storage unit) 57c, and a multiplier 57d.
In addition to controlling the operation of each part of the biological information detection device 1, the CPU 57 a performs a pulse rate calculation process based on a pulse wave signal detected by the biological sensor unit 4, a pitch calculation process based on a signal from the body motion sensor 24, and the like. Is what you do. Further, in the present embodiment, the control unit 57 determines whether or not the pulse rate measurement can be performed correctly, and if the pulse rate measurement cannot be performed correctly, that is the case. Is notified to the user by the notification unit 55, and control is performed so as to notify the countermeasure (coping method).
The RAM 57b is used as a work area of the CPU 57a, and temporarily stores the pulse rate and pitch calculation results, various calculation results, and various data by the CPU 57a.

The ROM 57c is, for example, a rewritable memory such as an EEPROM, and stores various data such as a control program executed by the CPU 57a and pulse rate data relating to the detected pulse rate in a nonvolatile manner.
In the ROM 57c, various reference information for determining whether or not the measurement of the pulse rate can be correctly performed in the biosensor unit 4 (information on a predetermined reference state, a predetermined reference level). Information, information that becomes a predetermined reference temperature) is stored. In addition, when it is determined that the pulse rate cannot be measured correctly, and the cause is a decrease in the outside air temperature, the biological sensor unit, such as wearing gloves, may be used to correctly measure the pulse rate. The advice information for notifying the user of a coping method that promotes the heat insulation around 4 is stored.
The multiplier 57d is used when executing a fast Fourier transform process (hereinafter referred to as “FFT process”) performed when extracting a pulse wave component from a pulse wave signal.

Next, a pulse rate calculation process as a basic operation executed by the control unit 57 in the biological information detection apparatus 1 in the present embodiment will be described.
FIG. 5 is a flowchart showing the procedure of the pulse rate calculation process. In the biological information detection apparatus 1 of the present embodiment, the pulse rate calculation method is switched according to the presence or absence of a body motion signal.
As shown in FIG. 5, the control unit 57 first detects the presence or absence of a body motion signal based on the output signal of the body motion waveform shaping circuit 52b (step S1), and determines the presence or absence of a body motion signal (step S2). ).
When it is determined in step S2 that there is a body motion signal (step S2: Y), the control unit 57 amplifies the pulse wave signal input from the biosensor unit 4 in the pulse wave signal amplification circuit 51a, A / D conversion is performed by the / D conversion circuit 51c (step S3). Next, the control unit 57 also causes the body motion signal amplification circuit 52a to amplify the body motion signal, and then performs A / D conversion by A / D conversion processing (step S4). Then, the control unit 57 performs FFT processing on the pulse wave signal and the body motion signal (step S5), extracts a pulse wave component that is a signal corresponding to the pulse (step S6), and extracts the extracted pulse. The pulse rate is calculated from the wave component (step S7).

  On the other hand, when it is determined in step S2 that there is no body motion signal (step S2: N), a pulse wave signal is detected (step S8). Then, it is determined whether or not a body motion signal is detected while detecting the pulse wave signal (step S9). If no body motion signal is detected (step S9: N), the pulse detected in step S8 is detected. The wave signal is subjected to rectangle conversion processing (step S10), and the pulse rate is calculated based on the rectangle (step S7).

  Thus, when no body motion signal is detected, it is not necessary to perform A / D conversion for both the pulse wave signal and the body motion signal. Therefore, the operation of the A / D conversion circuit 51c is stopped and necessary for the FFT processing. The operation of the multiplier 57d can be stopped. Moreover, since the process performed in CPU57a required for pulse wave extraction can also be stopped, power consumption can be reduced.

Next, with reference to FIG. 6, processing when the biological information detection apparatus 1 displays the pulse rate calculated as described above on the display unit 22 will be described. As described above, the biological information detection apparatus 1 has a function of determining whether or not the pulse rate can be correctly measured. Here, when determining whether or not the measurement of the pulse rate can be performed correctly, whether or not the pulse wave signal is correctly detected is determined based on the SN state of the pulse wave signal.
This is because if the SN state of the pulse wave signal is bad, it cannot be said that the pulse wave signal is correctly detected, and the pulse wave component that is a signal corresponding to the pulse is accurately extracted from such a pulse wave signal. This is because it is difficult to calculate the pulse rate correctly.
In addition, in the biological information detection apparatus 1 of the present embodiment, when the pulse rate cannot be measured correctly, and the cause is a decrease in the outside air temperature, the user is informed of this and the pulse It is configured to notify the user of a coping method for correctly performing the number measurement. Hereinafter, the procedure of the process will be described.

As shown in FIG. 6, the controller 57 first detects the SN state of the pulse wave signal (step S21). Here, the SN state of the pulse wave signal is the ratio of the noise component included in the pulse wave signal, and can be expressed by the ratio of the signal level of the noise component to the signal level of the pulse wave component included in the pulse wave signal. it can.
As a method for detecting the SN state of the pulse wave signal, for example, there is a method of detecting based on a baseline spectrum obtained by performing FFT processing on the pulse wave signal. Among each baseline spectrum obtained when FFT processing is performed on the pulse wave signal, the maximum baseline spectrum (Pmax) and the baseline spectrum (N) appearing at a predetermined position with respect to the maximum baseline spectrum are noise components. The base line spectrum (N) representing the noise component with respect to the maximum base line spectrum (Pmax), that is, the value of N / Pmax can be obtained. However, the position where the baseline spectrum regarded as a representative of the noise component appears can be selected, for example, by repeating the experiment in advance and the position where the noise component is highly likely to appear.

When the SN state of the pulse wave signal is detected in step S21, it is next determined whether or not the SN state is better than a predetermined reference state (step S22). Here, whether or not the SN state is good is performed by comparing the SN state of the pulse wave signal detected in step S1 with a predetermined reference state set in advance. That is, when compared with the predetermined reference state, when the ratio of the noise component included in the pulse wave signal is low, it is determined that the SN state is good (step S22: Y), and the pulse wave signal is more than the predetermined reference state. When the ratio of the included noise component is high, it is determined that the SN state is bad (step S22: N). Note that the reference state information relating to the predetermined reference state is stored in the ROM 57c.
If it is determined in step S22 that the SN state of the pulse wave signal is good (step S22: Y), the pulse rate calculated by the control unit 57 is displayed on the display unit 22 (step S23).

On the other hand, if it is determined in step S22 that the SN state of the pulse wave signal is not good (step S22: N), the pulse wave component is extracted from the pulse wave signal (step S24), and the signal level of the pulse wave component is It is determined whether or not the predetermined reference level is higher than a predetermined reference level (step S25). Reference level information corresponding to the predetermined reference level is also stored in the ROM 57c.
Here, the reason for comparing whether the signal level of the pulse wave component is larger than a predetermined reference level is that the SN state of the pulse wave signal is bad because the signal level of the noise component is too high, This is to determine whether the signal level of the pulse wave component is too low.
If it is determined in step S25 that the signal level of the pulse wave component is higher than the predetermined reference level (step S25: N), that is, it is determined that the signal level of the noise component included in the pulse wave signal is too high. In that case, the display of the pulse rate on the display unit 22 is not displayed (step S26).

  On the other hand, when it is determined that the signal level of the pulse wave component extracted from the pulse wave signal is lower than the reference level (step S25: Y), in the present embodiment, the temperature sensor 5 further surrounds the biosensor unit 4 The temperature (outside air temperature) is detected (step S27). Then, it is determined whether or not the temperature detected by the temperature sensor 5 is lower than a preset reference temperature (for example, 5 ° C. or the like) (step S28). Here, the temperature of the outside air temperature corresponding to the body surface temperature at which it is difficult to correctly detect the pulse wave signal is set as the reference temperature. The correspondence between the outside air temperature and the temperature of the body surface around the site where the living body unit 4 is mounted can be obtained by repeating experiments in advance using a plurality of subjects. In addition, it is possible to obtain correspondences by repeating experiments in advance for changes in body surface temperature and changes in signal level of pulse wave components extracted from pulse wave signals, and based on these correspondences. A reference temperature can be set. When the control unit 57 determines that the temperature around the biosensor unit 4 is lower than the reference temperature (step S28: Y), the biosensor unit instead of displaying the pulse rate on the display unit 22 is displayed. The ambient temperature of the biosensor unit 4 is lower than the reference temperature, such as a decrease in the outside air temperature. It is notified that it is low (step S29).

  Next, the advice information stored in the ROM 57c is read, and a coping method for correctly measuring the pulse rate, that is, a coping method for correctly detecting the pulse wave signal is displayed on the display unit 22 (step S30). When the ambient temperature of the biosensor unit 4 is low, that is, when the outside air temperature is lowered, the signal level of the pulse wave component included in the pulse wave signal is lowered due to the decrease in blood flow due to the contraction of the blood vessels of the user. To do. For this reason, in order to correctly detect the pulse wave signal, the surroundings of the biosensor unit 4 such as “please wear gloves” are kept warm by the cold protection device such as “please wear gloves” to the blood vessels of the user's fingers. To display a coping method that promotes an increase in blood flow.

  The operation of the biological information detecting device 1 in FIG. 6 is whether or not the cause that the SN state of the current pulse wave signal is not better than the predetermined reference state is because the current outside air temperature is lower than the predetermined reference temperature. The biological information detection apparatus 1 according to the present embodiment is configured to determine whether the control unit 57 will be in the future (after a predetermined time) based on the temperature change with the passage of time of the temperature detected by the temperature sensor 5. ), Whether or not the SN state deteriorates can be predicted in advance. This is based on the transition of the temperature change, and the control unit 57 predicts whether or not the temperature after a predetermined time will be lower than the reference temperature according to a temperature change transition prediction program stored in the ROM 57c or the like in advance. When it is predicted that the temperature around the biosensor unit 4 will be lower than the reference temperature after a predetermined time, the control unit 57 predicts a decrease in the outside air temperature on the display unit 22 in the same manner as described above. Displayed, or a message indicating that there is a possibility that the pulse rate may not be measured correctly due to a decrease in the outside air temperature, and a countermeasure such as “Prepare gloves beforehand” is displayed. In this way, when it is predicted that the outside air temperature will decrease and the pulse rate cannot be measured correctly, the user prepares gloves beforehand by informing the user of that fact and the countermeasures. Appropriate measures can be taken, such as putting on gloves in advance in preparation for a decrease in the outside air temperature.

  According to the present embodiment described above, the user's pulse wave signal can be detected by the biological sensor unit 4, and the user's pulse rate can be obtained based on the pulse wave signal. At this time, the control unit 57 detects the SN state of the pulse wave signal and determines whether or not the pulse wave signal is correctly detected by determining whether or not the detected SN state is better than a predetermined reference state. doing. When the control unit 57 determines that the SN state is not better than the reference state, first, based on the signal level of the pulse wave component extracted from the pulse wave signal, the temperature around the biosensor unit 4 is It is determined whether or not the temperature is lower than a predetermined reference temperature. Moreover, in the said embodiment, based on the temperature detected by the temperature sensor 5, it is discriminate | determined more reliably whether it is lower than reference temperature. When the temperature around the biosensor unit 4 is lower than the predetermined reference temperature, the notification unit 55 notifies the user that the pulse wave signal cannot be detected correctly because the temperature is lower than the predetermined reference temperature. Therefore, when the SN state deteriorates due to at least a decrease in the outside air temperature and the pulse wave signal cannot be detected correctly, the user can be notified of the reason why the pulse wave signal cannot be detected correctly. .

  Furthermore, according to the above-described embodiment, when the temperature around the biosensor unit 4 is low, a coping method for correctly detecting a pulse wave signal such as wearing gloves as advice information to the user Therefore, even if the outside air temperature is low, it is possible to notify the user of an appropriate coping method and to correctly detect the user's pulse wave signal.

The above-described embodiment is one aspect of the present invention, and it is needless to say that the embodiment can be appropriately changed without departing from the gist of the present invention.
For example, in the above embodiment, the temperature sensor 5 is disposed outside the sensor fixing band 42 for fixing the pulse wave detection mechanism 40 as shown in FIGS. 1 and 3. You may arrange | position inside the band 42 for fixation. The temperature sensor 5 is preferably disposed at a position where a pulse wave signal is detected, that is, around the pulse wave detection mechanism 40, but may be disposed in the apparatus main body 2. The correspondence between the temperature detected at the arrangement position of the temperature sensor 5 and the ambient temperature of the pulse wave detection mechanism 40 is obtained in advance by experiments or the like, so that the pulse can be obtained regardless of the arrangement position of the temperature sensor 5. The temperature around the wave detection mechanism 40 can be measured (estimated).
If the temperature sensor 5 is arranged in the apparatus main body 2, the members provided in the biosensor unit 4 can be reduced.

  In the above embodiment, the control unit 57 determines whether the signal level of the pulse wave component extracted from the pulse wave signal is lower than a predetermined reference level, and the signal level is lower than the reference level. In the case where the temperature is small, it is further configured to discriminate whether or not the temperature around the biological sensor unit 4 is lower than the reference temperature based on the temperature detected by the temperature sensor 5, but it is simply extracted from the pulse wave signal. It is good also as a structure which discriminate | determines whether the temperature around the biosensor unit 4 is lower than reference | standard temperature based on the signal level of the made pulse wave component. In this case, there is no need to provide a new component such as a temperature sensor in order to determine whether or not the temperature around the biosensor unit 4 is lower than the reference temperature, and the biosensor unit 4 can be manufactured without increasing costs. The ambient temperature can be detected.

  Similarly, without determining whether or not the signal level of the pulse wave signal extracted from the pulse wave signal is lower than the reference level in the control unit 57, the temperature sensor 5 simply disposed around the biological sensor unit 4 is used. It can also be configured to determine whether or not the temperature around the biosensor unit 4 is lower than the reference temperature only based on the temperature detected by. According to this configuration, it is possible to determine whether or not the temperature around the biosensor unit 4 is lower than the reference temperature based on the temperature detected by the temperature sensor 5 disposed around the biosensor unit 4. it can.

  However, as described above, the ambient temperature of the biosensor unit 4 is detected based on the signal level of the pulse wave signal and the temperature detected by the temperature sensor 5, thereby It is possible to more reliably determine that the pulse wave signal cannot be detected correctly because the blood flow has decreased due to the blood vessel contraction of the finger due to the decrease or the like.

  Moreover, in the said embodiment, the control part 57 is in the display part 22, when the signal level of a pulse-wave signal is smaller than a reference level, and the temperature detected by the temperature sensor 5 is more than a reference temperature. Although it has been described that the display of the pulse rate is not displayed, in this case, it is assumed that the user is not wearing the biosensor unit 4 correctly. It is good also as an aspect which alert | reports that there exists a possibility that it may not be in the mounting state which can detect a pulse rate correctly. If the pulse wave detection mechanism 40 is not disposed at a correct position with respect to the blood vessel of the user's finger by the sensor fixing band 42, the light cannot be correctly emitted from the LED 44 toward the blood vessel, or the reflected light is emitted by the phototransistor 45. Since light cannot be received correctly, it is conceivable that the signal level of the pulse wave component extracted from the pulse wave signal decreases. In this case, when the outside air temperature is higher than a predetermined temperature, the pulse wave signal can be correctly detected if the user correctly wears the biosensor unit 4. That is, when the signal level of the pulse wave signal is lower than the reference level and the temperature detected by the temperature sensor 5 is equal to or higher than the reference temperature, the notification unit 55 causes the biosensor unit 4 (pulse wave signal detection unit) It is preferable to notify that there is a possibility that the wearing state is not in a wearing state that can correctly detect the pulse wave detection signal.

In the above description, the control program for realizing each of the above functions has been stored in the ROM 57c in advance. However, the control program is recorded on a computer (CPU 57a) readable recording medium. It may be. With such a configuration, when the program is read from the storage medium by the computer and the computer executes processing according to the read program, the same operations and effects as those in the above embodiments can be obtained.
Here, the storage medium is a semiconductor storage medium such as RAM or ROM, a magnetic storage type storage medium such as FD or HD, an optical reading type storage medium such as CD, CDV, LD, or DVD, or a magnetic storage type such as MO. / Optical reading type storage medium, and any storage medium can be used as long as it can be read by a computer regardless of electronic, magnetic, optical, etc. .
It is also possible to configure such that a control program is downloaded, installed and executed via a communication network such as the Internet or a LAN and the communication unit 56.

It is an external appearance block diagram of the biometric information detection apparatus of this embodiment. It is a front view which shows the external appearance of the apparatus main body of a biometric information detection apparatus. It is sectional drawing of the biosensor unit of this embodiment. It is a block diagram which shows the functional structure of a biometric information detection apparatus. It is a flowchart for demonstrating the basic operation | movement at the time of pulse rate calculation. It is a flowchart regarding the discrimination processing of the detection state of a pulse wave signal.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Living body information detection apparatus, 4 ... Living body sensor unit (pulse wave signal detection part), 5 ... Temperature sensor, 22 ... Display part, 51 ... Pulse wave data processing part, 52 ... Pitch data processing part, 53 ... Clock generation part 54 ... Input unit 55 ... Notification unit 56 ... Communication unit 57 ... Control unit (SN state detection unit, SN state determination unit, temperature determination unit), 57a ... CPU, 57b ... RAM, 57c ... ROM (storage unit) ), 57d: Multiplier.

Claims (8)

A pulse wave signal detector that is mounted on the user and detects the user's pulse wave signal;
A display unit for displaying the pulse rate based on the pulse wave signal detected by the pulse wave signal detection unit;
An SN state detection unit for detecting an SN state based on a ratio of a noise component to a pulse wave component of the pulse wave signal;
An SN state determination unit for determining whether or not the SN state is better than a predetermined reference state;
When it is determined that the SN state is not better than the reference state, and the signal level of the pulse wave component of the pulse wave signal is smaller than a predetermined reference level, the temperature around the pulse wave signal detection unit is predetermined A temperature discriminating unit for discriminating whether or not the temperature is lower than a reference temperature;
Informing that the pulse wave signal cannot be detected correctly because the temperature around the pulse wave signal detection unit is lower than a predetermined reference temperature when the temperature around the pulse wave signal detection unit is lower than the reference temperature And
When it is determined that the SN state is not better than the reference state and the signal level of the pulse wave component of the pulse wave signal is higher than a predetermined reference level, the display of the pulse rate on the display unit is not displayed. A control unit,
A biological information detection device comprising: The biological information detection apparatus according to claim 1,
A body motion sensor that detects a user's body motion and outputs a body motion signal;
The controller performs a process of removing a body motion component from the pulse wave signal detected by the pulse wave signal detector when a body motion signal is output by the body motion sensor;
A biological information detection device comprising: The biological information detection apparatus according to claim 1 or 2,
A temperature sensor disposed around the pulse wave signal detection unit and detecting a temperature around the pulse wave signal detection unit;
The temperature determination unit determines whether or not the temperature around the pulse wave signal detection unit is lower than the reference temperature based on the temperature detected by the temperature sensor;
A biological information detection device characterized by the above. In the living body information detecting device according to any one of claims 1 to 3,
A storage unit that stores advice information indicating a coping method for correctly detecting the pulse wave signal when the temperature around the pulse wave detection unit is lower than the reference temperature;
When the temperature determination unit determines that the temperature around the pulse wave detection unit is lower than the reference temperature, the notification unit notifies the advice information;
A biological information detection device characterized by the above. In the living body information detection device according to any one of claims 1 to 4,
A temperature change detection unit for detecting a temperature change around the pulse wave signal detection unit over time; and
Based on the temperature change detected by the temperature change detection unit, a temperature change prediction unit that predicts whether the temperature around the pulse wave signal detection unit is lower than the reference temperature after a predetermined time;
With
The notification unit, wherein when the temperature of the pulse wave signal detection unit around after the predetermined time due to a temperature change estimating unit is expected to be lower than the reference temperature, the pulse wave signal detecting unit after between when the predetermined Notifying that the pulse wave signal may not be correctly detected due to a decrease in ambient temperature,
A biological information detection device characterized by the above. The biological information detection apparatus according to claim 5,
A storage unit that stores advice information indicating a coping method for correctly detecting the pulse wave signal when the temperature around the pulse wave detection unit is lower than the reference temperature;
When the temperature change prediction unit predicts that the temperature around the pulse wave detection unit is lower than the reference temperature, the notification unit notifies the advice information;
A biological information detection device characterized by the above. A pulse wave signal detection unit that detects a user's pulse wave signal that is worn by the user, a notification unit that notifies predetermined information, and a pulse rate based on the pulse wave signal detected by the pulse wave signal detection unit A biological information detection device control method for controlling a biological information detection device comprising a display unit,
A pulse wave signal detection process for causing the pulse wave signal detection unit to detect the pulse wave signal of the user;
An SN state detection process for detecting an SN state based on a ratio of a noise component to a pulse wave component of the pulse wave signal;
An SN state determination process for determining whether the SN state is better than a predetermined reference state;
When it is determined that the SN state is not better than the reference state, and the signal level of the pulse wave component of the pulse wave signal is smaller than a predetermined reference level, the temperature around the pulse wave signal detection unit is predetermined A temperature determination process for determining whether the temperature is lower than a reference temperature,
When the temperature around the pulse wave signal detection unit is lower than the reference temperature, the notification unit notifies that the pulse wave signal cannot be detected correctly because the temperature around the pulse wave signal detection unit is lower than a predetermined reference temperature. A notification process for notification;
When it is determined that the SN state is not better than the reference state and the signal level of the pulse wave component of the pulse wave signal is higher than a predetermined reference level, the display of the pulse rate on the display unit is not displayed. The process of
A control method for a biological information detection device comprising: A pulse wave signal detection unit that detects a user's pulse wave signal that is worn by the user, a notification unit that notifies predetermined information, and a pulse rate based on the pulse wave signal detected by the pulse wave signal detection unit A control program for controlling a biological information detection device including a display unit using a computer,
Let the pulse wave signal detection unit detect the pulse wave signal of the user,
Detecting an SN state based on a ratio of a noise component to a pulse wave component of the pulse wave signal;
Determining whether the SN state is better than a predetermined reference state;
When it is determined that the SN state is not better than the reference state, and the signal level of the pulse wave component of the pulse wave signal is smaller than a predetermined reference level, the temperature around the pulse wave signal detection unit is predetermined Determine whether it is lower than the reference temperature,
When the temperature around the pulse wave signal detection unit is lower than the reference temperature, the notification unit notifies that the pulse wave signal cannot be detected correctly because the temperature around the pulse wave signal detection unit is lower than a predetermined reference temperature. Let me know,
When it is determined that the SN state is not better than the reference state and the signal level of the pulse wave component of the pulse wave signal is higher than a predetermined reference level, the display of the pulse rate on the display unit is not displayed. To do,
A control program characterized by

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