JP2016055059A - Biological information measurement device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a biological information measurement device capable of preventing ambient temperature from being erroneously recognized as living body temperature, when a device body is removed from a living body.SOLUTION: A biological information measurement device 1 comprises: a device body 2; a living body temperature sensor 21 mounted on the device body 2, and measuring temperature of a human body on which the device body 2 is mounted; an ambient temperature sensor 22 mounted on the device body 2, and measuring ambient temperature of the device body 2; a calculation part for calculating a difference between an output signal of the living body temperature sensor 21 and an output signal of the ambient temperature sensor 22; and a determination part for determining whether or not the device body 2 is mounted on the human body.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a biological information measuring device that can be attached to and detached from a living body such as a person or an animal.

  Conventionally, as a biological information measuring device, there is one described in Japanese translations of PCT publication No. 2014-505533 (patent document 1). This biological information measuring device has a device body and a temperature sensor for measuring the temperature of the human body. The biological information measuring device measures the temperature of the human body wearing the device main body with a temperature sensor.

Special table 2014-505533 gazette

  By the way, in the said conventional biological information measuring device, when the apparatus main body was removed from the human body, the temperature sensor measured the ambient temperature, and there was a problem that this ambient temperature was mistaken as the human body temperature.

  Accordingly, an object of the present invention is to provide a biological information measuring device that can prevent the ambient temperature from being misidentified as the biological temperature when the apparatus main body is removed from the biological body.

In order to solve the above problems, the biological information measuring device of the present invention is
The device body;
A biological temperature sensor for measuring the temperature of a living body attached to the apparatus main body and attached to the apparatus main body;
An ambient temperature sensor attached to the device body and for measuring the ambient temperature of the device body;
A calculation unit for calculating a difference between an output signal of the living body temperature sensor and an output signal of the ambient temperature sensor;
And a determination unit that determines whether or not the apparatus main body is attached to a living body based on a calculation result of the calculation unit.

  According to the biological information measuring apparatus of the present invention, the calculation unit calculates the difference between the output signal of the biological temperature sensor and the output signal of the ambient temperature sensor, and the determination unit is based on the calculation result of the calculation unit. Whether or not is attached to the living body. Thereby, it is possible to distinguish whether the temperature measured by the living body temperature sensor is the temperature when the apparatus main body is attached to the living body or the temperature when the apparatus main body is removed from the living body. . Therefore, even when the living body temperature sensor measures the ambient temperature when the apparatus main body is removed from the living body, it is possible to prevent the ambient temperature from being misidentified as the living body temperature.

  In one embodiment, the living body temperature sensor and the ambient temperature sensor are thermistors.

  According to the biological information measuring device of the embodiment, since the biological temperature sensor and the ambient temperature sensor are thermistors, the resistance of the biological temperature sensor and the ambient temperature sensor changes according to the temperature. For example, the calculation unit can obtain a calculation result by converting a resistance change of each of the living body temperature sensor and the ambient temperature sensor into a voltage change and calculating a difference between the voltage changes.

  The biological information measurement device according to an embodiment further includes a power saving mode control unit that controls the device main body to a power saving mode when the determination unit determines that the device main body is not attached to a living body. .

  Here, the power saving mode refers to a mode for suppressing power consumption, for example, lowering the brightness of the screen of the biological information measuring device.

  According to the biological information measuring device of the embodiment, the power saving mode control unit controls the device main body to the power saving mode when the determination unit determines that the device main body is not attached to the living body. Electric power can be reduced.

  Further, in the biological information measuring apparatus according to an embodiment, when the determination unit determines that the device main body is attached to a living body, the power saving release mode control unit controls the device main body to a power saving release mode. Have

  Here, the power saving cancellation mode refers to a mode for canceling the power saving mode, for example, returning the brightness of the screen of the biological information measurement device to normal brightness.

  According to the biological information measuring apparatus of the embodiment, the power saving cancellation mode control unit controls the apparatus main body to the power saving cancellation mode when the determination unit determines that the apparatus main body is attached to the living body. , Can resume quickly to normal use.

Moreover, in the biological information measuring device of one embodiment,
The calculation unit obtains an absolute value of a difference between an output signal of the living body temperature sensor and an output signal of the ambient temperature sensor,
The determination unit determines that the apparatus main body is attached to a living body when the absolute value of the difference is greater than or equal to a first threshold, while the absolute value of the difference is smaller than the first threshold, It is determined that the apparatus main body is not attached to the living body.

  According to the biological information measuring apparatus of the embodiment, the determination unit determines that the apparatus main body is attached to the living body when the absolute value of the difference is equal to or greater than the first threshold, while the absolute value of the difference is the first. When it is smaller than the threshold value, it is determined that the apparatus main body is not mounted on the living body, and therefore it is possible to easily determine whether the apparatus main body is mounted or not.

Moreover, in the biological information measuring device of one embodiment,
The determination unit
When it is determined that the apparatus main body is not attached to a living body, when the absolute value of the amount of change per unit time of the absolute value of the difference becomes a second threshold value or more, the apparatus main body is attached to the living body. While judging that it has been installed,
When it is determined that the apparatus main body is attached to a living body, when the absolute value of the amount of change per unit time of the absolute value of the difference becomes equal to or greater than the second threshold, the apparatus main body is Judged that it began to be removed.

  According to the biological information measuring apparatus of the embodiment, the determination unit determines that the apparatus main body has started to be attached to the living body when the absolute value of the amount of change per unit time of the absolute value of the difference is equal to or greater than the second threshold value. It is judged or it is judged that the apparatus main body has started to be removed from the living body. Therefore, it is possible to easily determine the change from the mounting of the apparatus main body to the non-mounting and the change from the non-mounting of the apparatus main body to the mounting.

  In the biological information measuring device according to an embodiment, at least the temperature measured by the biological temperature sensor when the determination unit determines that the device main body is attached to the living body is stored. A storage unit.

  According to the biological information measuring device of the embodiment, the storage unit stores the temperature measured by the biological temperature sensor (that is, the biological temperature) when the apparatus main body is attached to the living body, and is stored, for example, The living body temperature can be used for monitoring.

  Further, in the biological information measuring device of one embodiment, at least the temperature measured by the biological temperature sensor when the determination unit determines that the device main body is attached to the living body is the temperature measured by the biological temperature sensor. A transmission unit for transmitting to the outside of the apparatus main body is included.

  According to the biological information measuring apparatus of the embodiment, the transmission unit transmits the temperature measured by the biological temperature sensor (that is, the biological temperature) to the outside of the apparatus main body when the apparatus main body is attached to the living body. For example, the transmitted living body temperature can be used for monitoring.

  In the living body information measuring device of one embodiment, the storage part further memorizes at least one of living body information other than living body temperature, and position information.

  Here, the biological information refers to information such as the pulse and blood pressure of the living body, for example, and the position information refers to the current position of the living body, for example.

  According to the biological information measuring device of the embodiment, the storage unit further stores at least one of the biological information and the position information. For example, the stored biological information and position information can be used for monitoring.

  In the living body information measuring device of one embodiment, the transmitting part further transmits at least one of living body information other than living body temperature and position information.

  Here, the biological information refers to information such as the pulse and blood pressure of the living body, for example, and the position information refers to the current position of the living body, for example.

  According to the biological information measuring device of the embodiment, the transmission unit further transmits at least one of the biological information and the position information. For example, the transmitted biological information and position information can be used for monitoring.

  According to the biological information measuring apparatus of the present invention, the calculation unit calculates the difference between the output signal of the biological temperature sensor and the output signal of the ambient temperature sensor, and the determination unit is based on the calculation result of the calculation unit. Therefore, it is possible to prevent the ambient temperature from being misidentified as the living body temperature when the apparatus main body is removed from the living body.

It is explanatory drawing which shows the use condition of the biometric information measuring apparatus of 1st Embodiment of this invention. It is sectional drawing of a biological information measuring device. It is a block diagram of a control apparatus. It is a graph which shows the relationship between the measurement temperature of a biological temperature sensor, and the measurement temperature of an ambient temperature sensor. It is a graph which shows the relationship between the measurement temperature of a biological temperature sensor, and the measurement temperature of an ambient temperature sensor. It is a graph which shows the relationship between the measurement temperature of a biological temperature sensor, and the measurement temperature of an ambient temperature sensor. It is a graph which shows the temperature difference of the measurement temperature of a biological temperature sensor, and the measurement temperature of an ambient temperature sensor. It is a block diagram which shows the control apparatus of the biological information measuring device of 2nd Embodiment of this invention. It is a circuit diagram which shows the calculating part of the control apparatus of the biological information measuring device of 3rd Embodiment of this invention. It is a graph of the voltage output from a calculating part.

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

(First embodiment)
FIG. 1 is an explanatory diagram showing a usage state of the biological information measuring apparatus 1 according to the first embodiment of the present invention. As shown in FIG. 1, the biological information measuring apparatus 1 is a so-called wearable device, and is detachably attached to a wrist of a human body. The biological information measuring device 1 measures at least the temperature of the human body as biological information. The biological information is used for, for example, health care and medical treatment.

  When the biological information measuring device 1 is used as health care, the biological information measuring device 1 is worn by a person who is exercising and is managed during the exercise. When the biological information measuring device 1 is used as medical care, the biological information measuring device 1 is attached to a patient and the physical condition of the patient is managed. In this embodiment, the living body information measuring apparatus 1 is used for a human body, but may be used for an animal (living body) such as a cow or a horse.

  FIG. 2 is a cross-sectional view of the biological information measuring device 1. As shown in FIGS. 1 and 2, the biological information measuring device 1 includes a device main body 2, a biological temperature sensor 21 and an ambient temperature sensor 22 attached to the device main body 2, and a circuit board 6 attached to the device main body 2. Have.

  The apparatus main body 2 includes a housing 10 and a belt 15 attached to the housing 10. The housing 10 includes a case main body 11 and a heat conductor 12. The case body 11 is made of, for example, resin. The heat conductor 12 is made of metal, for example. An opening 11a is provided on the bottom surface of the case body 11, and the heat conductor 12 is fitted into the opening 11a. The belt 15 is attached to the case main body 11 and is detachably wound around the wrist. With the apparatus main body 2 attached to the wrist, the heat conductor 12 comes into contact with the wrist. A liquid crystal screen (not shown) is provided on the upper surface of the case body 11, and biological information, time, and the like are displayed on the liquid crystal screen.

  The living body temperature sensor 21 measures the body temperature of the human body to which the apparatus main body 2 is attached. The ambient temperature sensor 22 measures the temperature around the apparatus body 2. The living body temperature sensor 21 and the ambient temperature sensor 22 are thermistors, and the electrical resistance changes according to the measured temperature. An example of the thermistor is an NTC (Negative Temperature Coefficient) thermistor, and the electrical resistance decreases as the measured temperature increases. The characteristics of the living body temperature sensor 21 and the characteristics of the ambient temperature sensor 22 are preferably the same.

  The biological temperature sensor 21 is disposed inside the housing 10. Specifically, the living body temperature sensor 21 is attached to the inside of the heat conductor 12 via the flexible substrate 5. The flexible substrate 5 is attached to the inside of the heat conductor 12 with, for example, a double-sided tape 7 having good heat conductivity. The biological temperature sensor 21 detects the temperature of the wrist in contact with the heat conductor 12 by the heat conduction of the heat conductor 12 and the flexible substrate 5.

  The ambient temperature sensor 22 is disposed inside the housing 10. Specifically, the ambient temperature sensor 22 is attached to the circuit board 6. The circuit board 6 is attached inside the housing 10. The ambient temperature sensor 22 detects the temperature inside the housing 10. Since the temperature inside the housing 10 is substantially the same as the temperature outside the housing 10, the ambient temperature sensor 22 detects the temperature around the housing 10 (that is, the outside air temperature).

  A control device 30 is provided on the circuit board 6. The control device 30 includes a CPU (Central Processing Unit) and the like, and controls various operations of the biological information measurement device 1. The flexible board 5 is electrically connected to the circuit board 6. The living body temperature sensor 21 and the ambient temperature sensor 22 are electrically connected to the control device 30.

  FIG. 3 is a block diagram of the control device 30. As illustrated in FIG. 3, the control device 30 includes a calculation unit 31, a determination unit 32, a storage unit 33, and a transmission unit 34.

  The calculation unit 31 calculates the difference between the output signal of the living body temperature sensor 21 and the output signal of the ambient temperature sensor 22. Here, the output signal refers to an analog signal or a digital signal corresponding to the detected temperature.

  The determination unit 32 determines whether the apparatus main body 2 is attached to a human body based on the calculation result of the calculation unit 31. Thereby, it is distinguished whether the temperature measured by the living body temperature sensor 21 is a temperature when the apparatus main body 2 is attached to the human body or a temperature when the apparatus main body 2 is detached from the human body. be able to.

  The storage unit 33 stores at least the temperature measured by the living body temperature sensor 21 when the determination unit 32 determines that the apparatus main body 2 is attached to the human body. That is, the memory | storage part 33 memorize | stores the measurement temperature (namely, human body temperature) of the biological body temperature sensor 21 when the apparatus main body 2 is mounted | worn with the human body. The stored human body temperature is used for monitoring, for example. In addition, the memory | storage part 33 memorize | stores all the temperatures measured with the biological temperature sensor 21, and after that, compared with the judgment result by the judgment part 32 by the control apparatus 30 etc., human body temperature is selected from all the temperatures. You may make it detect.

  The transmission unit 34 transmits at least the temperature measured by the living body temperature sensor 21 when the determination unit 32 determines that the apparatus main body 2 is attached to the human body to the outside of the apparatus main body 21. . Specifically, the transmission unit 34 transfers the human body temperature stored in the storage unit 33 to an external device such as a smartphone. The transmitted human body temperature is used for monitoring, for example. The transmission unit 34 may directly transmit the measurement temperature (human body temperature) of the living body temperature sensor 21 when the apparatus main body 2 is attached to the human body to the outside. The transmission unit 34 transmits all the temperatures measured by the living body temperature sensor 21 to the outside, and then detects the human body temperature from all the temperatures in comparison with the determination result by the determination unit 32. May be.

  The storage unit 33 may further store at least one of biological information and position information. The transmission unit 34 may further transmit at least one of biological information and position information. Here, the biological information is biological information other than the human body temperature, for example, information such as the pulse and blood pressure of the human body. The position information refers to the current position of the human body, for example. Therefore, in addition to the human body temperature, biological information and position information can be used for monitoring.

  Next, an example of the operation of the calculation unit 31 and the determination unit 32 will be described.

  The calculation unit 31 obtains the absolute value of the difference between the output signal of the living body temperature sensor 21 and the output signal of the ambient temperature sensor 22. Specifically, the output signal of the biological temperature sensor 21 is a temperature measured by the biological temperature sensor 21, and the output signal of the ambient temperature sensor 22 is a temperature measured by the ambient temperature sensor 22.

  When the absolute value of the difference is greater than or equal to the first threshold, the determination unit 32 determines that the apparatus main body 2 is worn on the human body, while when the absolute value of the difference is smaller than the first threshold, It is determined that it is not worn on the human body. The first threshold value is a predetermined value so that it is possible to determine whether the apparatus main body 2 is attached to or removed from the human body, and can be appropriately changed according to conditions such as the place of use and sensor accuracy. The first threshold is, for example, 0.5 ° C., and may be 1 ° C., 2 ° C., or the like depending on conditions.

  Here, as an example, FIGS. 4A and 4B illustrate the relationship between the measured temperature of the living body temperature sensor 21 and the measured temperature of the ambient temperature sensor 22. The measurement temperature of the living body temperature sensor 21 is indicated by a solid line, and the measurement temperature of the ambient temperature sensor 22 is indicated by a dotted line. The horizontal axis represents time [s], and the vertical axis represents temperature [° C.].

  In FIG. 4A, the absolute value of the difference between the measured temperature of the living body temperature sensor 21 and the measured temperature of the ambient temperature sensor 22 is the first threshold value (in the illustrated example, 0.5 ° C., and so on). That's it. Therefore, in the state of FIG. 4A, the determination unit 32 determines that the apparatus main body 2 is attached to the human body, and the measurement temperature of the living body temperature sensor 21 at this time can be the human body temperature.

  In FIG. 4B, the absolute value of the difference between the measured temperature of the living body temperature sensor 21 and the measured temperature of the ambient temperature sensor 22 is smaller than the first threshold (0.5 ° C.). Therefore, in the state of FIG. 4B, the determination unit 32 determines that the apparatus main body 2 is not attached to the human body, and the measured temperature of the living body temperature sensor 21 at this time cannot be the human body temperature.

  Therefore, it is possible to easily determine whether the apparatus main body 2 is mounted or not by the operations of the calculation unit 31 and the determination unit 32 as described above.

  The determination unit 32 further performs the following operation. When the determination unit 32 determines that the apparatus main body 2 is not worn on the human body and the absolute value of the change amount per unit time of the absolute value of the difference is equal to or greater than the second threshold value, the apparatus main body 2 is determined to be attached to the human body. On the other hand, when the determination unit 32 determines that the apparatus main body 2 is worn on the human body, and the absolute value of the change amount per unit time of the absolute value of the difference is equal to or greater than the second threshold value, It is determined that the apparatus main body 2 has started to be removed from the human body. The second threshold value is a predetermined value so that a change between the mounting of the apparatus main body 2 and the non-mounting of the apparatus main body 2 can be determined, and the setting can be appropriately changed according to conditions such as the place of use and sensor accuracy. is there. The second threshold value is, for example, 0.2 ° C./10 s, and may be 0.5 ° C./10 s, 1 ° C./10 s, or the like depending on conditions.

  Here, as an example, FIG. 5A illustrates the relationship between the measured temperature of the living body temperature sensor 21 and the measured temperature of the ambient temperature sensor 22. The measurement temperature of the living body temperature sensor 21 is indicated by a solid line, and the measurement temperature of the ambient temperature sensor 22 is indicated by a dotted line. The horizontal axis represents time [s], and the vertical axis represents temperature [° C.]. FIG. 5B shows the absolute value (temperature difference) of the difference between the measured temperature of the living body temperature sensor 21 and the measured temperature of the ambient temperature sensor 22. The horizontal axis represents time [s], and the vertical axis represents temperature difference [° C.].

  As shown in FIG. 5A, the measurement temperature of the living body temperature sensor 21 changes with time. That is, when the time is 0 to t1, the temperature remains at 34.1 ° C., and when the time is t1 to t2, the temperature gradually increases from 34.1 ° C. to 34.6 ° C. When t is t2 to t3, the temperature remains at 34.6 ° C, and when time is from t3 to t4, the temperature gradually decreases from 34.6 ° C to 34.1 ° C, and the time is after t4 The temperature remains at 34.1 ° C. On the other hand, the measurement temperature of the ambient temperature sensor 22 is constant and remains at 34.1 ° C. over time.

  As shown in FIG. 5B, when the time is 0 to t1, the temperature difference remains 0 ° C., and when the time is t1 to t2, the temperature difference increases stepwise from 0 ° C. to 0.5 ° C. When the time is t2 to t3, the temperature difference remains at 0.5 ° C., and when the time is t3 to t4, the temperature difference gradually decreases from 0.5 ° C. to 0 ° C. When t is after t4, the temperature difference remains at 0 ° C.

  As described above, when the temperature difference is equal to or greater than the first threshold value (0.5 ° C.), the determination unit 32 determines that the apparatus main body 2 is attached to the human body, and the temperature difference is equal to the first threshold value (0. When the temperature is smaller than 5 ° C., it is determined that the apparatus main body 2 is not attached to the human body. Therefore, when the time is t2 to t3, it is determined that the apparatus main body 2 is attached to the human body, and when the time is 0 to t2 and after t3, it is determined that the apparatus main body 2 is not attached to the human body. Is done.

  Then, the determination unit 32 determines that the apparatus main body 2 is not worn on the human body, and the absolute value of the change amount of the temperature difference per unit time (temperature difference inclination) is a second threshold (illustrated). In the example, it is set to 0.2 ° C./10 s. The same shall apply hereinafter.) When the above is reached, it is determined that the apparatus main body 2 has started to be attached to the human body. Therefore, when the time is 0 to t2 and it is determined that the apparatus main body 2 is not worn on the human body, and the time is t1 to t2, the absolute value of the gradient of the temperature difference is the second threshold (0 .2 ° C./10 s) or more, it is determined that the apparatus main body 2 has started to be attached to the human body when the time is t1 to t2.

  Similarly, when the time is t3 to t4 in a state where it is determined that the apparatus main body 2 is not attached to the human body after the time t3, the absolute value of the gradient of the temperature difference is the second threshold (0 .2 ° C./10 s) or more, it is determined that the apparatus main body 2 has started to be attached to the human body when the time is t3 to t4.

  When the time is t2 to t3, the determination unit 32 determines that the apparatus main body 2 is attached to the human body, but the absolute value of the gradient of the temperature difference is the second threshold (0.2 ° C./10 s). Therefore, the determination unit 32 does not determine that the apparatus main body 2 has started to be removed from the human body.

  Therefore, by the operation of the determination unit 32 as described above, it is possible to easily determine the change from mounting to non-mounting of the apparatus main body 2 and the change from non-mounting to mounting of the apparatus main body 2.

  According to the biological information measuring apparatus 1, the calculation unit 31 calculates the difference between the output signal of the biological temperature sensor 21 and the output signal of the ambient temperature sensor 22, and the determination unit 32 is based on the calculation result of the calculation unit 31. Then, it is determined whether or not the apparatus main body 2 is attached to the human body. Thereby, it is distinguished whether the temperature measured by the living body temperature sensor 21 is a temperature when the apparatus main body 2 is attached to the human body or a temperature when the apparatus main body 2 is detached from the human body. be able to. Therefore, even when the living body temperature sensor 21 measures the ambient temperature when the apparatus main body 2 is detached from the human body, it is possible to prevent the ambient temperature from being misidentified as the human body temperature. For example, it is possible to prevent erroneous monitoring of the human body temperature. It is also possible to check whether the user is wearing the apparatus main body 2.

  Here, in the conventional biological information measuring apparatus, if it is determined whether the apparatus main body is attached or detached, it is conceivable to use an optical sensor for detecting the attachment / detachment of the apparatus main body. Therefore, since the structure of the optical sensor is different from the structure of the temperature sensor, the optical sensor and the temperature sensor must be controlled in different ways. On the other hand, in the present invention, one ambient temperature sensor 22 is added, the difference between the living body temperature sensor 21 and the ambient temperature sensor 22 is obtained, and the attachment / detachment of the mounting body 2 is determined. Therefore, since the structure of the ambient temperature sensor is the same as that of the living body temperature sensor, the ambient temperature sensor and the living body temperature sensor can be controlled by the same method.

(Second Embodiment)
FIG. 6 is a block diagram showing a control apparatus of the biological information measuring apparatus according to the second embodiment of the present invention. As illustrated in FIG. 6, the control device 30 </ b> A of the second embodiment includes a power saving mode control unit 35 and a power saving release mode control unit 36 in addition to the configuration of the control device 30 of the first embodiment. Since the calculation part 31, the judgment part 32, the memory | storage part 33, and the transmission part 34 of 30 A of control apparatuses are the same structures as 1st Embodiment, the description is abbreviate | omitted.

  The power saving mode control unit 35 controls the apparatus main body 2 to the power saving mode when the determination unit 32 determines that the apparatus main body 2 is not attached to a human body. Here, the power saving mode refers to a mode for suppressing power consumption, for example, to reduce the brightness of the liquid crystal screen of the biological information measuring device 1.

  Therefore, since the power saving mode control unit 35 controls the apparatus main body 2 to the power saving mode when the apparatus main body 2 is not attached, power consumption can be reduced. Moreover, the troublesomeness that the user must set to the power saving mode can be avoided. In this way, a special work for setting the power saving mode is not necessary, and this is particularly effective for children and elderly people. In addition, since power consumption can be reduced, a battery with low power can be used.

  The power saving cancel mode control unit 36 controls the device main body 2 to the power saving cancel mode when the determination unit 32 determines that the device main body 2 is attached to the human body. Here, the power saving cancellation mode refers to a mode for canceling the power saving mode, for example, returning the brightness of the liquid crystal screen of the biological information measuring device 1 to normal brightness.

  Therefore, when the apparatus main body 2 is mounted, the power saving cancellation mode control unit 36 controls the apparatus main body 2 to the power saving cancellation mode, so that it can be quickly resumed for normal use.

(Third embodiment)
FIG. 7 is a circuit diagram showing a calculation unit of the control device of the biological information measuring apparatus according to the third embodiment of the present invention. The third embodiment is different from the first embodiment only in the configuration of the calculation unit. Note that in the third embodiment, the same reference numerals as those in the first embodiment have the same configurations as those in the first embodiment, and a description thereof will be omitted.

  As illustrated in FIG. 7, the calculation unit 31 </ b> B obtains a calculation result by converting each resistance change of the living body temperature sensor 21 and the ambient temperature sensor 22 into a voltage change and calculating a difference between the voltage changes. . Specifically, the voltage difference circuit 60 of the arithmetic unit 31B includes a differential amplifier 50, a first buffer 51, a second buffer 52, first to fourth fixed resistors 61 to 64, and a capacitor 65. Have.

  Differential amplifier 50 includes an inverting input 50a, a non-inverting input 50b, and an output 50c. The differential amplifier 50 amplifies the difference between the input signal from the inverting input 50a and the input signal from the non-inverting input 50b by a constant coefficient (differential gain), and outputs it from the output 50c.

  The first fixed resistor 61 is connected between the inverting input 50 a of the differential amplifier 50 and the power supply voltage 40. The second fixed resistor 62 is connected between the non-inverting input 50 b of the differential amplifier 50 and the power supply voltage 40. The third fixed resistor 63 is connected between the inverting input 50 a of the differential amplifier 50 and the first fixed resistor 61. The fourth fixed resistor 64 is connected between the inverting input 50 a of the differential amplifier 50 and the output 50 c of the differential amplifier 50.

  The first buffer 51 is connected between the first fixed resistor 61 and the third fixed resistor 63. The second buffer 52 is connected between the non-inverting input 50 b of the differential amplifier 50 and the second fixed resistor 62. The first and second buffers 51 and 52 suppress the impedance of the input signal, respectively.

  The capacitor 65 is connected to the output 50 c of the differential amplifier 50. The capacitor 65 cuts the DC component from the output signal of the differential amplifier 50 and extracts the AC component. The AC component of the output signal of the differential amplifier 50 is output from the output point 45 of the calculation unit 31B.

  The living body temperature sensor 21 is connected between the inverting input 50a of the differential amplifier 50 and GND (ground). Specifically, the living body temperature sensor 21 is connected to the difference between the first buffer 51 and the third fixed resistor 63. Connected to the inverting input 50 a of the dynamic amplifier 50.

  The ambient temperature sensor 22 is connected between the non-inverting input 50b of the differential amplifier 50 and the GND. Specifically, the ambient temperature sensor 22 is connected to the non-inverting input 50b of the differential amplifier 50 via the second buffer 52. Connected to.

  The biological temperature sensor 21 is connected to the inverting input 50 a side of the differential amplifier 50 through the first contact 41 of the voltage difference circuit 60. The ambient temperature sensor 22 is connected to the non-inverting input 50 b side of the differential amplifier 50 via the second contact 42 of the voltage difference circuit 60. The biological temperature sensor 21 and the ambient temperature sensor 22 are connected to the GND side of the differential amplifier 50 via the third contact 43 of the voltage difference circuit 60.

  Next, the operation of the calculation unit 31B will be described.

  As a first state, when the user wears the apparatus main body 2, the living body temperature sensor 21 detects the body temperature of the user. Then, the temperature detected by the living body temperature sensor 21 increases, the resistance of the living body temperature sensor 21 decreases, and the voltage Vdet1 at the first contact 41 decreases. On the other hand, since the temperature detected by the ambient temperature sensor 22 does not change, the voltage Vdet2 at the second contact 42 does not change. As a result, the voltage output from the output 50c of the differential amplifier 50 increases. By picking up the change in the output voltage via the capacitor 65, a positive voltage is output from the output point 45 of the calculation unit 31B as shown in FIG.

  As a second state, if the user does not wear the apparatus main body 2, the resistances of the living body temperature sensor 21 and the ambient temperature sensor 22 do not change, and the voltage Vdet1 of the first contact 41 and the voltage Vdet2 of the second contact 42 are ,It does not change. As a result, the output voltage of the differential amplifier 50 does not change, and the voltage output from the output point 45 of the arithmetic unit 31B is 0, as shown in FIG.

  Thereafter, the determination unit 32 determines whether or not the apparatus main body 2 is attached to a human body based on an output signal from the output point 45 of the calculation unit 31B. That is, as shown in FIG. 8, when the voltage output from the calculation unit 31B is positive, the determination unit 32 determines that the apparatus main body 2 is attached, and the voltage output from the calculation unit 31B is When it is 0, it is determined that the apparatus main body 2 is not attached.

  The present invention is not limited to the above-described embodiment, and the design can be changed without departing from the gist of the present invention. For example, the feature points of the first to third embodiments may be variously combined.

  In the first embodiment, the biological information measuring device is disposed in the housing of the apparatus main body, but may be disposed on the belt of the apparatus main body.

  In the first embodiment, the living body temperature sensor is used by being attached to the wrist of the human body. However, the living body temperature sensor may be used by being attached to any appropriate part such as the second arm or the ankle.

  In the first and second embodiments, the control device includes the storage unit and the transmission unit. However, either the storage unit or the transmission unit may be provided, or both the storage unit and the transmission unit may be provided. It does not have to be provided.

  In the second embodiment, the power saving mode control unit and the power saving cancellation mode control unit are provided in the control device. However, either one of the power saving mode control unit or the power saving cancellation mode control unit may be provided.

  In the first embodiment, the calculation unit calculates the absolute value of the difference between the output signal of the biological temperature sensor and the output signal of the ambient temperature sensor, but subtracts the output signal of the ambient temperature sensor from the output signal of the biological temperature sensor. The relative value of the difference may be obtained. At this time, the determination unit may compare the relative value of the difference with a threshold value.

  In the first embodiment, the determination unit compares the absolute value of the change amount per unit time of the absolute value of the difference with the threshold value, but compares the change amount of the absolute value of the difference value per unit time with the threshold value. May be.

  In the first embodiment, the living body temperature sensor and the ambient temperature sensor are continuously sensing, but may be intermittently sensing.

  In the first embodiment, the determination unit determines whether to attach / detach the apparatus main body and start of attachment / detachment of the apparatus main body. However, the determination unit may not determine the start of attachment / detachment of the apparatus main body. .

  In the third embodiment, the voltage difference circuit is used as the circuit of the calculation unit. However, the voltage difference circuit in which the biological temperature sensor and the ambient temperature sensor are connected in series is used to connect the biological temperature sensor and the ambient temperature sensor. The voltage signal may be detected. Further, as the circuit of the calculation unit, other circuits may be used instead of the voltage difference circuit or the voltage dividing circuit.

  In the first to third embodiments, the NTC thermistor is used as the living body temperature sensor and the ambient temperature sensor. However, a PTC (Positive Temperature Coefficient) thermistor may be used.

DESCRIPTION OF SYMBOLS 1 Biological information measuring device 2 Apparatus main body 5 Flexible board 6 Circuit board 10 Case 11 Case main body 12 Thermal conductor 15 Belt 21 Biological temperature sensor 22 Ambient temperature sensor 30, 30A Control apparatus 31, 31B Calculation part 32 Judgment part 33 Storage part 34 Transmitter 35 Power Saving Mode Control Unit 36 Power Saving Cancel Mode Control Unit

Claims (10)

The device body;
A biological temperature sensor for measuring the temperature of a living body attached to the apparatus main body and attached to the apparatus main body;
An ambient temperature sensor attached to the device body and for measuring the ambient temperature of the device body;
A calculation unit for calculating a difference between an output signal of the living body temperature sensor and an output signal of the ambient temperature sensor;
A biological information measurement device comprising: a determination unit that determines whether or not the device main body is attached to a living body based on a calculation result of the calculation unit.   The biological information measuring device according to claim 1, wherein the biological temperature sensor and the ambient temperature sensor are thermistors.   The biological information measurement according to claim 1, further comprising: a power saving mode control unit configured to control the device main body to a power saving mode when the determination unit determines that the device main body is not attached to the living body. apparatus.   4. The apparatus according to claim 1, further comprising: a power saving cancel mode control unit configured to control the apparatus main body to a power saving cancel mode when the determination unit determines that the device main body is attached to a living body. The biological information measuring device according to one. The calculation unit obtains an absolute value of a difference between an output signal of the living body temperature sensor and an output signal of the ambient temperature sensor,
The determination unit determines that the apparatus main body is attached to a living body when the absolute value of the difference is greater than or equal to a first threshold, while the absolute value of the difference is smaller than the first threshold, The biological information measuring apparatus according to claim 1, wherein the apparatus main body is determined not to be attached to a living body. The determination unit
When it is determined that the apparatus main body is not attached to a living body, when the absolute value of the amount of change per unit time of the absolute value of the difference becomes a second threshold value or more, the apparatus main body is attached to the living body. While judging that it has been installed,
When it is determined that the apparatus main body is attached to a living body, when the absolute value of the amount of change per unit time of the absolute value of the difference becomes equal to or greater than the second threshold, the apparatus main body is The biological information measuring device according to claim 1, wherein the biological information measuring device determines that it has started to be removed from the living body.   7. The storage unit according to claim 1, further comprising: a storage unit configured to store at least a temperature when the determination unit determines that the apparatus main body is attached to a living body among the temperatures measured by the biological temperature sensor. The biological information measuring device according to any one of the above.   A transmitting unit for transmitting at least the temperature measured by the living body temperature sensor when the determining unit determines that the device main body is mounted on the living body to the outside of the device main body; The biological information measuring device according to any one of claims 1 to 7, further comprising:   The biological information measuring device according to claim 7, wherein the storage unit further stores at least one of biological information other than biological temperature and position information.   The biological information measuring apparatus according to claim 8, wherein the transmission unit further transmits at least one of biological information other than biological temperature and position information.

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