JP2011098002A - Pulse measuring device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently obtain information relating to pulse corresponding to the body movement of a user. <P>SOLUTION: A control section 30 specifies the frequency of the body movement by using a digital signal S21 obtained from the light emitted from a light emitting diode 11A and a digital signal S23 obtained from an acceleration sensor in the case the acceleration by the body movement measured by the acceleration sensor 27 exceeds a threshold value. The control section 30 obtains the frequency of the pulse from the signal obtained by removing the component of the frequency specified from the digital signal S22 obtained from the light emitted from the light emitting diode 11B and displays the obtained frequency of the pulse. Further, the control section 30 obtains the frequency of the pulse from the digital signal S22 and displays the obtained frequency of the pulse when the acceleration by the body movement is less than the threshold value continuously during a certain period. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a technique for obtaining information related to a biological pulse.

Patent Document 1 discloses a biological information measuring apparatus that irradiates a living body with light, detects light reflected by blood in the living body with a light receiving element, and measures a pulse. This biological information measuring device has a blue LED (Light Emitting Diode) and a red LED. In addition, the biological information measuring apparatus has a photodetector on which two filters having different transmission wavelength characteristics are attached. The biological information measuring apparatus alternately detects light reflected from the blood emitted from the blue LED and light reflected from the blood emitted from the red LED using a single photodetector.
Moreover, the said biological information measuring device has an acceleration sensor, and detects a user's body movement with an acceleration sensor. The signal output from the photodetector includes a body motion component in addition to a component related to the pulse of the living body. The biological information measuring device specifies a body motion component using a signal output from the acceleration sensor. Then, the specified body motion component is subtracted from the signal obtained from the photodetector to detect the user's pulse rate.

JP 2005-52385 A

  By the way, when measuring information related to the pulse of a living body, there are a state in which body movement occurs and a state in which no body movement occurs. In a resting state, the signal from the photodetector may be a signal that does not show a component of body movement. However, the biological information measuring device performs an operation for specifying a component of body motion using a signal output from the acceleration sensor even when the component of body motion does not appear in the signal in such a resting state, and the photodetector The calculation for obtaining information on the pulse is performed using both the signal from the acceleration sensor and the signal from the acceleration sensor.

  The present invention has been made in view of the above-described circumstances, and one of its purposes is to make it possible to efficiently obtain information about a pulse corresponding to a user's body movement.

In order to achieve the above object, a pulse measuring device according to the present invention includes a light having a first wavelength that reaches and reflects in the epidermis of a living body, and a wavelength longer than the first wavelength in the reticulated layer of the living body. A light source that irradiates the living body with light of the second wavelength that reaches and is reflected within the mesh layer, light of the first wavelength that is reflected by the living body, and light that is irradiated from the light source and reflected by the living body A light receiving unit that receives the light of the second wavelength, outputs a first signal corresponding to the received light of the first wavelength, and a second signal corresponding to the received light of the second wavelength; An acceleration measuring unit that measures the acceleration of the device due to body movement and outputs an acceleration signal representing the measured acceleration; and when the acceleration represented by the acceleration signal exceeds a predetermined acceleration, the displacement of the device relative to the living body A frequency associated with the first signal is identified and identified. Information on the pulse is generated from the signal obtained by removing the frequency component from the second signal, and information on the pulse is generated from the second signal when the acceleration represented by the acceleration signal is less than a predetermined acceleration for a certain period of time. And an information generation unit for generating.
According to the present invention, when the acceleration due to the body motion is less than the threshold value, information about the pulse can be obtained from only one signal, so that the information about the pulse can be efficiently obtained corresponding to the body motion of the user.

In the present invention, when the acceleration represented by the acceleration signal becomes less than a predetermined acceleration for a certain period of time, the irradiation of the light of the first wavelength to the living body may be stopped.
According to this configuration, when the acceleration due to body movement is less than the threshold value, the irradiation with the light of the first wavelength is stopped, so that information on the pulse can be obtained efficiently while suppressing power consumption.

Further, in the present invention, the information generation unit identifies the frequency of the body movement from the acceleration signal, and relates to a deviation of the identified body movement frequency component and the own device identified from the first signal. The structure which produces | generates the information regarding a pulse from the signal obtained by removing the component of a frequency from the said 2nd signal may be sufficient.
According to this configuration, since a plurality of frequency components related to body motion are removed from the second signal, information about the pulse can be obtained more accurately.

In the present invention, when the acceleration represented by the acceleration signal is less than a predetermined acceleration for a certain period of time, the information generation unit identifies the frequency of the body movement from the acceleration signal, and The configuration may be such that information about a pulse is generated from a signal obtained by removing a frequency component from the second signal.
According to this configuration, since the frequency component of body motion is removed from the second signal, information on the pulse can be obtained more accurately.

1 is an external view of a pulse measuring device 1 according to an embodiment of the present invention. The block diagram which showed the hardware constitutions of the pulse measuring apparatus 1. FIG. The figure which showed the structure of the detection part 20, and the skin of the human body 100 typically. The figure which showed the external appearance and equivalent circuit of the photodiode 21. FIG. The flowchart which showed the flow of the process which the pulse measuring device 1 performs. The flowchart which showed the flow of the process which the pulse measuring device 1 performs. The flowchart which showed the flow of the process which the pulse measuring device 1 performs. The flowchart which showed the flow of the process which the pulse measuring device 1 performs.

[Embodiment]
FIG. 1 is an external view of a pulse measuring device 1 according to an embodiment of the present invention. The pulse measuring device 1 is a device that measures a pulse wave and a pulse of the human body 100. The pulse measuring device 1 has a plurality of buttons 51A and 51B that function as an operation unit for operating the pulse measuring device 1. The pulse measuring device 1 also has a display unit 40 that displays information related to the pulse. The pulse measuring device 1 is fixed to the human body 100 by the belt 2 similarly to the wristwatch, and displays the measured pulse wave and pulse on the display unit 40.

FIG. 2 is a block diagram showing a hardware configuration of the measuring apparatus 1. The light source 10 includes a light emitting diode 11A and a light emitting diode 11B that irradiate the human body 100 with light. In the present embodiment, the peak wavelength of the light output from the light emitting diode 11A is 430 nm. The peak wavelength of light output from the light emitting diode 11B is 620 nm. The light emitting diodes 11A and 11B are turned off / on by the control unit 30.
The detection unit 20 includes a photodiode 21 as a light receiving element (light receiving unit) that converts received light into an electric signal. The light reflected by the human body 100 is received by the photodiode 21 and a signal corresponding to the received light. Is output.

FIG. 3 is a diagram schematically illustrating the configuration of the detection unit 20 and the skin of the human body 100. FIG. 4A is a top view of the photodiode 21 included in the detection unit 20, and FIG. 4B is an equivalent circuit diagram of the photodiode 21. As shown in FIG. 4A, the photodiode 21 includes a first light receiving unit (hereinafter referred to as a first light receiving unit 22A) and a second light receiving unit (hereinafter referred to as a second light receiving unit 22B). Have. That is, the photodiode 21 according to the present embodiment is a two-divided photodiode obtained by dividing the light receiving unit into two in one light receiving element.
As shown in FIG. 4B, the photodiode 21 has an electrical signal for the cathode of the photodiode 23A that converts the light that has reached the first light receiving portion 22A into an electrical signal, and the light that has reached the second light receiving portion 22B. The cathodes of the photodiodes 23B to be converted into are connected to each other, and the cathode side is connected to the terminals 24A and 24D. The anode of the photodiode 23A is connected to the terminal 24C, and the anode of the photodiode 23B is connected to the terminal 24B.
When light enters the first light receiving unit 22A in a reverse biased state, the photodiode 21 outputs an analog signal S11 corresponding to the light incident on the first light receiving unit 22A from the terminal 24C. When light enters the second light receiving unit 22B, an analog signal S12 corresponding to the light incident on the second light receiving unit 22B is output from the terminal 24B.

The first filter 25A (first filtering means) and the second filter 25B (second filtering means) are filters that transmit light having a predetermined wavelength. The first filter 25A is disposed on the surface of the first light receiving unit 22A, and the second filter 25B is disposed on the surface of the second light receiving unit 22B. In the present embodiment, the wavelength of the light that passes through the first filter 25A is 430 nm, which is the same wavelength as the wavelength of the light that the light emitting diode 11A irradiates the human body 100 with. Moreover, the wavelength of the light which permeate | transmits the 2nd filter 25B is 620 nm, and is the same wavelength as the wavelength of the light which the light emitting diode 11B irradiates to the human body 100.
For this reason, among the light irradiated from the light emitting diode 11A and reflected by the human body 100, light having a wavelength of 430 nm passes through the first filter 25A and reaches the first light receiving unit 22A. In the photodiode 21, an analog signal S11 corresponding to the amount of light incident on the first light receiving unit 22A is output from the terminal 24C. Of the light emitted from the light emitting diode 11B and reflected by the human body 100, light having a wavelength of 620 nm passes through the second filter 25B and reaches the second light receiving unit 22B. In the photodiode 21, an analog signal S12 corresponding to the amount of light incident on the second light receiving unit 22B is output from the terminal 24B.

The detection unit 20 includes an acceleration sensor 27. When the pulse measuring device 1 moves in accordance with the movement (body movement) of the human body 100, the acceleration sensor 27 measures the acceleration of the moved pulse measuring device 1 and outputs an analog signal S13 representing the measured acceleration.
The converter 26 has a function of converting an input analog signal into a digital signal. The converter 26 is connected to the terminals 24B and 24C of the photodiode 21. The converter 26 is connected to the acceleration sensor 27.
The converter 26 receives the analog signal S12 output from the terminal 24B and the analog signal S11 output from the terminal 24C. The converter 26 receives the analog signal S13 output from the acceleration sensor 27. Further, the converter 26 is connected to the control unit 30. The converter 26 converts the input analog signal S11 into a digital signal S21 and outputs it to the control unit 30. Further, the converter 26 converts the input analog signal S12 into a digital signal S22 and outputs the digital signal S22 to the control unit 30. Further, the converter 26 converts the input analog signal S13 into a digital signal S23 and outputs the digital signal S23 to the control unit 30.

The control unit 30 is a so-called microcomputer having a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), an input port, and an output port. The control unit 30 operates according to a program stored in the ROM, and controls each connected unit. The control unit 30 functions as an information generation unit that analyzes the signal output from the detection unit 20 and generates information on the pulse and pulse wave of the living body, and controls the display unit 40 to display the measurement result on the display unit 40. Let
The storage unit 35 is a non-volatile memory and is connected to the control unit 30. The storage unit 35 stores a signal output from the detection unit 20 under the control of the control unit 30.
The display unit 40 includes a liquid crystal display device, and displays a result measured by the control unit 30. In the present embodiment, the display unit 40 displays the measurement result on a liquid crystal display device, but the display is not limited to the liquid crystal display device, and a display device using organic EL (Electro-Luminescence), etc. Other display devices may be used.
The operation unit 50 includes buttons 51A and 51B for operating the measuring apparatus 1. The control unit 30 monitors operations performed on these buttons, and performs control of the light source 10, display of measurement results, acquisition of information regarding the pulse, and the like according to the performed operations.

(Operation of the embodiment)
Next, the operation of the pulse measuring device 1 will be described. First, when power is supplied from a power supply (not shown) to each unit of the pulse measuring device 1, the control unit 30 executes a program stored in the ROM. After the control unit 30 starts executing the program, when an operation for instructing the start of pulse measurement is performed on the button of the operation unit 50 (FIG. 5: step SA1; YES), the pulse measuring device 1 changes the mode of operation. The first mode is set (step SA2). Next, when the operation mode is the first mode (step SA3; YES), the control unit 30 performs the first process (step SA4).

In the first process, the control unit 30 turns on the light emitting diodes 11A and 11B and irradiates the skin of the human body 100 with light (FIG. 6: Step SB1).
The skin of the human body 100 has an epidermis 110, a nipple layer 120, a nipple lower layer 130, and a mesh layer 140 as shown in FIG. When the light applied to the skin is in a so-called visible light region, it is known that the light reaches only a shallow layer when the wavelength is short, and reaches a deep layer as the wavelength of light increases.
For example, in the case of light with a wavelength of 620 nm (hereinafter referred to as second light 12B) emitted from the light emitting diode 11B, the second light 12B reaches the reticulated layer 140, and the inside of the capillary vessel in the reticulated layer 140 Reflect with blood. The reticulated layer 140 has lymphatic vessels, sweat glands, sebaceous glands, etc., and therefore the second light 12B reflected by the blood is affected by the lymph vessels, sweat glands, sebaceous glands, and the like. Further, when the human body 100 moves, the lymph vessels, sweat glands, sebaceous glands, and the like also move due to the movement of the human body 100 (hereinafter referred to as body movement), and the second light 12B reflected by the blood is also affected by the body movement.

  Further, in the case of light with a wavelength of 430 nm irradiated from the light emitting diode 11A (hereinafter referred to as the first light 12A), the first light 12A does not reach the lower layer than the skin 110 and is reflected by the skin 110. . Since the epidermis 110 has no blood vessels, the light reflected by the epidermis 110 includes a component of deviation of the pulse measuring device 1 with respect to the human body 100 when there is a body motion.

  The light irradiated and reflected from the light emitting diodes 11A and 11B reaches the first filter 25A and the second filter 25B. Here, since the wavelength of the light transmitted through the second filter 25B is the wavelength of the second light 12B, the second light 12B included in the reflected light passes through the second filter 25B. When the passed light reaches the second light receiving unit 22B, an analog signal S12 corresponding to the reached light is output from the terminal 24B of the photodiode 21 to the converter 26. Since the second light 12B that reaches the second light receiving unit 22B is affected by the movement of the human body 100 as described above, when the human body 100 moves, the signal output from the terminal 24B includes a change in blood flow. In addition to the above components, the body motion components are also included.

  Further, since the first filter 25A has the wavelength of the transmitted light equal to the wavelength of the first light 12A, the first light 12A included in the reflected light passes through the first filter 25A. When the passed light reaches the first light receiving unit 22A, an analog signal S11 corresponding to the reached light is output from the terminal 24C of the photodiode 21 to the converter 26. Note that the movement of the human body 100 relative to the pulse measuring device 1 appears in the first light 12A reaching the first light receiving unit 22A as described above.

  Further, in the acceleration sensor 27, when the pulse measuring device 1 moves in accordance with the movement of the human body 100, the acceleration when the pulse measuring device 1 moves is measured, and the analog signal S13 representing the measured acceleration is the acceleration sensor 27. Is output from.

  The converter 26 converts the analog signal S11 supplied from the terminal 24C into a digital signal S21, and supplies the digital signal S21 obtained by the conversion to the control unit 30. The converter 26 converts the analog signal S12 supplied from the terminal 24B into a digital signal S22, and supplies the digital signal S22 obtained by the conversion to the control unit 30. The converter 26 converts the analog signal S13 supplied from the acceleration sensor 27 into a digital signal S23, and supplies the digital signal S23 obtained by the conversion to the control unit 30.

  When acquiring the digital signal S21 supplied from the converter 26 (step SB2), the control unit 30 performs a fast Fourier transform process on the acquired digital signal S21 (step SB3). Further, when acquiring the digital signal S22 supplied from the converter 26 (step SB4), the control unit 30 performs a fast Fourier transform process on the acquired digital signal S22 (step SB5). Further, when acquiring the digital signal S23 supplied from the converter 26 (step SB6), the control unit 30 performs a fast Fourier transform process on the acquired digital signal S23 (step SB7).

  The control unit 30 obtains a frequency spectrum by fast Fourier transform processing. Since the analog signal S11 before the conversion is related to the displacement of the pulse measuring device 1 with respect to the human body 100, in the frequency spectrum obtained by performing the fast Fourier transform processing on the digital signal S21, the displacement of the pulse measuring device 1 A peak appears at the frequency f2. In addition, in the digital signal S23, the analog signal S13 before conversion corresponds to the body movement and includes a body movement component. For this reason, in the frequency spectrum obtained by performing the fast Fourier transform process on the digital signal S23, a peak appears at the frequency f3 of the body motion component included in the digital signal S23. The control unit 30 identifies the peak frequency f2 and frequency f3 as the frequency of the body motion component (step SB8).

  Next, the control unit 30 performs an operation for removing the frequency f2 component and the frequency f3 component on the digital signal S22 (step SB9). The signal from which the component of the frequency f2 and the component of the frequency f3 are removed is the signal from which the pulse wave is represented because the component of the deviation of the human body 100 from the pulse measuring device 1 and the component of the body motion are removed. Wave signal). The control unit 30 performs a fast Fourier transform process on the pulse wave signal (step SB10). In the frequency spectrum obtained by the fast Fourier transform process, a peak appears in the pulse frequency appearing in the pulse wave signal. The control unit 30 identifies the frequency at which the peak appears as the pulse frequency, and calculates the pulse rate of the human body 100 using the identified frequency (step SB11). An example of a method for calculating the pulse rate is a method of multiplying the specified pulse frequency by 60. When calculating the pulse rate, the control unit 30 displays the calculated pulse rate on the display unit 40 (step SB12).

  When an operation for instructing the end of measurement is performed on the operation unit 50 (step SA6; YES), the control unit 30 turns off the light emitting diodes 11A and 11B (step SA7), and the flow of processing proceeds to step SA1. return. On the other hand, if the control unit 30 determines NO in step SA6, it returns the process flow to step SA3.

In addition, the control part 30 is performing the process of FIG. 8 in parallel with the process of FIGS. Specifically, the control unit 30 performs the process shown in FIG. 8 on the digital signal S23 sequentially input from the converter 26. First, the control unit 30 initializes the value of the counter n for measuring a certain period and sets it to “0” (step SD1).
Thereafter, it is determined whether the value of the input digital signal S23, that is, the acceleration is equal to or greater than a predetermined threshold (hereinafter referred to as an acceleration threshold). When the value of the digital signal S23 is greater than or equal to the acceleration threshold (step SD2; YES), that is, when the acceleration due to body movement is greater than or equal to a predetermined acceleration, the control unit 30 sets the operation mode to the first mode. (Step SD3). Then, the process flow goes to step SD1. As for the acceleration threshold, the acceleration when the influence of body movement appears in the analog signal S11 is used as the threshold, but it may be set as appropriate depending on the design.

On the other hand, when the value of the digital signal S23 is less than the acceleration threshold, that is, when the acceleration due to body movement is less than a predetermined acceleration (step SD2; NO), the control unit 30 sets the value of the counter n to “1”. "Is added (step SD4). Thereafter, the control unit 30 determines whether the value of the counter n is equal to or greater than a predetermined threshold value (hereinafter referred to as a counter threshold value). Here, when the value of the counter n is less than the counter threshold value, the control unit 30 moves the processing flow to step SD2.
On the other hand, when the value of the counter n is equal to or greater than the threshold value (step SD5; YES), the control unit 30 determines that the acceleration due to the body movement is less than the acceleration threshold value during a certain period. Here, the control unit 30 determines that the human body 100 has little or no body movement, and sets the operation mode to the second mode (step SD6). Then, the process flow goes to step SD2.

When the flow of processing returns to step SA3 and the operation mode is set to the second mode by the processing of FIG. 8, the control unit 30 performs the second processing (step SA5).
Specifically, the control unit 30 turns off the light emitting diode 11A and turns on the light emitting diode 11B (FIG. 7: step SC1). As a result, the analog signal S11 is not output to the converter 26, and the signals input from the converter 26 to the control unit 30 are the digital signal S22 and the digital signal S23. The control unit 30 acquires the digital signal S22 (step SC2), and performs a fast Fourier transform process on the acquired digital signal S22 (step SC3). Here, the control unit 30 does not perform a fast Fourier transform process on the digital signal S23.

The control unit 30 obtains a frequency spectrum by fast Fourier transform processing. In the frequency spectrum obtained by performing the fast Fourier transform process on the digital signal S22, a peak appears in the frequency f1 of the pulse component included in the digital signal S22. In addition, since the control unit 30 is in the state in which the operation mode is the second mode, that is, it is determined that the body motion is small or no body motion, in the digital signal S22, the intensity of the frequency of the component of the body motion is high. It is smaller than the intensity of the frequency f1 of the pulse component or no peak appears.
The control unit 30 compares the intensity of the frequency f1 at which a peak appears in the frequency spectrum obtained from the digital signal S22 with a predetermined threshold value. Here, the control part 30 specifies the frequency f1 which becomes the intensity | strength more than a threshold value as the frequency of a pulse component (step SC4). The control unit 30 calculates the pulse rate of the human body 100 using the specified frequency f1 (step SC5). When calculating the pulse rate, control unit 30 displays the calculated pulse rate on display unit 40 (step SC6).

As described above, according to the present embodiment, when the body movement continues to be small, the light emitting diode 11A is turned off and the pulse is measured, so the light emitting diodes 11A and 11B are measured regardless of the body movement. The power consumption can be suppressed as compared with the configuration in which both are turned on and the pulse is measured. Further, the processing when the body motion is small or the body motion is not continued (the processing in FIG. 7) is a step compared to the processing (the processing in FIG. 6) performed when the acceleration due to the body motion is equal to or greater than the acceleration threshold. Since the number is small, the pulse rate can be obtained efficiently.
Further, when the body motion becomes large, both the light emitting diode 11A and the light emitting diode 11B are turned on to measure the pulse, and further, the component related to the body motion is surely removed using the signal from the acceleration sensor 27. Therefore, accurate information about the pulse can be obtained.

[Modification]
As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment mentioned above, It can implement with another various form. For example, the present invention may be implemented by modifying the above-described embodiment as follows. In addition, you may combine each of embodiment mentioned above and the following modifications.

In the present invention, the emission spectrum of the light emitted from the light emitting diode 11A has a peak wavelength other than 430 nm as long as light having a wavelength that does not reach the papilla layer 120 and is reflected by the epidermis 110 is included. Also good.
In the present invention, the emission spectrum of the light emitted from the light emitting diode 11B includes light having a wavelength that reaches the mesh layer 140 and is reflected by the blood in the capillaries of the mesh layer 140. The peak wavelength may be other than 620 nm.
Further, if the wavelength of the first light 12A is shorter than the wavelength of the second light 12B, the wavelength of the first light 12A and the wavelength of the second light 12B may be wavelengths other than those described above.
Moreover, in embodiment mentioned above, although the light emitting diodes 11A and 11B irradiate the human body 100 with light, what irradiates the human body 100 with light is not limited to the light emitting diodes 11A and 11B. As long as it is an element that emits the first light 12 </ b> A and the second light 12 </ b> B described above, the human body 100 may be irradiated with light by a light emitting element (for example, a laser element) other than the light emitting diode.

In the present invention, the wavelength of light transmitted through the first filter 25A and the wavelength of light transmitted through the second filter 25B are not limited to the wavelengths described above. The first filter 25A only needs to transmit light having a wavelength other than 430 nm and having a wavelength that does not reach the papilla layer 120 and is reflected by the epidermis 110.
The second filter 25B only needs to transmit light having a wavelength other than 620 nm and having a wavelength that reaches the mesh layer 140 and is reflected by the blood in the capillaries of the mesh layer 140. For example, the wavelength of light transmitted through the second filter 25B may be 570 nm, 660 nm, or the like.

  In the present invention, the transmittance of the first filter 25A and the second filter 25B are such that the amount of light reaching the first light receiving unit 22A and the amount of light reaching the second light receiving unit 22B are the same or close to each other. May be set. Further, when the transmittance of the first filter 25A and the transmittance of the second filter 25B are the same, the amount of light reaching the first light receiving unit 22A and the amount of light reaching the second light receiving unit 22B are the same or You may set the emission spectrum of 11 A of light emitting diodes, and the light emitting diode 11B so that it may become close.

In the present invention, the pulse measuring device 1 may generate a pulse wave waveform from the pulse wave signal, and display the generated pulse wave waveform on the display unit 40.
In the present invention, the control unit 30 may cause the storage unit 35 to store the digital signal supplied from the converter 26. Alternatively, the pulse measuring device 1 may be connected to a computer device, and the digital signal stored in the storage unit 35 may be transmitted to the computer device. Moreover, the digital signal memorize | stored in the memory | storage part 35 may be acquired with a computer apparatus, and the acquired digital signal may be analyzed with a computer apparatus.
In the embodiment described above, the converter 26 is separate from the control unit 30, but the control unit 30 may have the function of the converter 26.
In the above-described embodiment, the measurement device 1 obtains information related to the pulse of the human body 100. However, the measurement device 1 is used to obtain information related to the pulse of the animal using an animal (living body) other than a human. May be.

In the present invention, the detection unit 20 uses two photodiodes each having one light receiving unit, and one photodiode receives the first light 12A and the other photodiode receives the second light 12B. It is good.
In the embodiment described above, the light emitting diode 11A is turned off in the second process, but the light emitting diode 11A may be turned on also in the second process.
In the second process described above, the frequency at which a peak appears in the frequency spectrum of the digital signal S23 may be specified, and a component representing the pulse wave may be obtained by removing the specified frequency component from the digital signal S22.
Further, in the first processing of the above-described embodiment, calculation is performed to remove the frequency f2 component and the frequency f3 component from the digital signal S22, but only the frequency f2 component is removed from the digital signal S22. It may be.

DESCRIPTION OF SYMBOLS 1 ... Pulse measuring device, 2 ... Belt, 10 ... Light source, 11A, 11B ... Light emitting diode, 12A ... 1st light, 12B ... 2nd light, 20 ... Detection Part, 21 ... photodiode, 22A ... first light receiving part, 22B ... second light receiving part, 23A, 23B ... photodiode, 24A-24D ... terminal, 25A ... first Filter, 25B ... second filter, 26 ... converter, 27 ... acceleration sensor, 30 ... control unit, 35 ... storage unit, 40 ... display unit, 50 ... operation unit 51A, 51B ... button, 100 ... human body, 110 ... epidermis, 120 ... nipple layer, 130 ... lower nipple layer, 140 ... mesh layer

Claims (4)

Light having a first wavelength that reaches inside the skin of the living body and is reflected by the skin, and light having a second wavelength that is longer than the first wavelength and reaches the inside of the mesh layer of the living body and reflects within the mesh layer. A light source for irradiating a living body,
First light corresponding to the received light of the first wavelength is received by the light of the first wavelength reflected by the living body and the light of the second wavelength irradiated from the light source and reflected by the living body. A light receiving unit that outputs a signal and a second signal corresponding to the received light of the second wavelength;
An acceleration measuring unit that measures the acceleration of the device due to the body movement of the living body and outputs an acceleration signal representing the measured acceleration;
When the acceleration represented by the acceleration signal is greater than or equal to a predetermined acceleration, the frequency relating to the deviation of the device relative to the living body is identified from the first signal, and the component of the identified frequency is removed from the second signal. An information generation unit that generates information about a pulse from the obtained signal, and generates information about the pulse from the second signal when the acceleration represented by the acceleration signal is less than a predetermined acceleration for a certain period of time.   2. The pulse measuring device according to claim 1, wherein when the acceleration represented by the acceleration signal is less than a predetermined acceleration for a certain period of time, irradiation of the living body with the light having the first wavelength is stopped. The information generation unit specifies the frequency of the body movement from the acceleration signal, and determines the frequency component of the specified body movement and the frequency component related to the deviation of the own device specified from the first signal. The pulse measurement device according to claim 1 or 2, wherein information about a pulse is generated from a signal obtained by removing the two signals. The information generation unit specifies the frequency of the body movement from the acceleration signal when the acceleration represented by the acceleration signal is less than a predetermined acceleration for a certain period of time, and determines the frequency component of the specified body movement as the second component. The pulse measurement device according to any one of claims 1 to 3, wherein information about the pulse is generated from a signal obtained by removing the signal.

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