WO2017126022A1 - Pulse wave detection system - Google Patents

Abstract

The present invention includes: a detection device (1) that emits a plurality of types of light which can be distinguished from one another to easily determine whether a received waveform derives from a subject to be measured or from ambient light even while a vehicle is moving, and that receives the emitted plurality of types of light; and a control device (2) that determines whether a pulse wave has been detected on the basis of information on the plurality of types of light received by the detection device (1). The detection device (1) and the control device (2) are characterized in that: the detection device (1) and the control device (2) are provided in the vehicle;andthat the control device (2) determines whether the pulse wave has been detected by comparing phases of the received plurality of types of light while in a state where the vehicle is moving.

Description

Pulse wave detection system

The present invention relates to a technology of a pulse wave detection system that detects a driver's pulse wave.

There has been proposed a system for managing the health of a driver by detecting the pulse wave of the driver during driving.
For example, Patent Document 1 states that “the living body information measuring device emits a plurality of lights having different wavelengths to the living tissue, and receives each light transmitted or reflected by the living tissue, and the living tissue. An analysis processing unit that calculates biological information of the biological tissue based on each light transmitted or reflected, a display unit that displays the biological information calculated by the analysis processing unit, and measurement of the biological tissue by the measurement unit A determination unit that determines whether or not the measurement is completed, and the display unit sets the biological information as a fixed display when the measurement unit determines that the measurement of the biological tissue by the measurement unit is completed. When the normal operation is performed from the measurement of the biological tissue in the measurement unit to the fixed display of the display unit, normal operation information indicating that the measurement unit is normally operated is further displayed. There has been disclosed (see Abstract).

Patent Document 2 states that “the sensing units 11 and 12 are respectively disposed on the steering wheel 20 of the automobile. Each sensing unit 11 and 12 is a pulse wave sensing device for measuring a pulse wave from a subject's hand. And an impedance sensing unit for measuring body impedance, the left hand of the subject is brought into contact with one sensing unit 11 and the right hand is brought into contact with the other sensing unit 12 to obtain blood pressure and body fat. An in-vehicle health care device that measures simultaneously "is disclosed (see summary).

JP 2010-264126 A JP 2006-26211 A

Unlike the measurement on the bed, the measurement during driving of the vehicle causes the vibration of the car and the like, making it difficult to measure the pulse wave.
The techniques described in Patent Document 1 and Patent Document 2 do not describe means for solving the above problems.

The present invention has been made in view of such a background, and the present invention can easily determine whether a received light waveform derived from a measurement object or a received light waveform derived from ambient light, even while the moving body is moving. The issue is to determine.

In order to solve the above-described problems, the present invention provides a pulse wave based on a detection unit that receives a plurality of types of light that is emitted and distinguishable from each other, and information on the plurality of types of light received by the detection unit. A pulse wave detection processing unit that determines whether the pulse wave is detected, the detection unit and the pulse wave detection processing unit are provided in a moving body, and the pulse wave detection processing unit includes the moving body In a state where the pulse wave is moving, it is determined whether or not the pulse wave is detected by comparing phases of the received plural types of light.

According to the present invention, it is possible to easily determine whether the received light waveform is derived from the measurement target or the received light waveform from disturbance light even while the moving body is moving.

It is a figure showing an example of composition of a pulse wave detection system concerning a 1st embodiment. 2 is an AA cross section of a steering in the present embodiment. It is a figure which shows a reflection type sensor apparatus. It is a figure which shows a transmissive | pervious sensor apparatus. It is a figure which shows the structure of the control apparatus which concerns on 1st Embodiment. It is a figure which shows the example of the light emission pattern and light reception pattern which concern on 1st Embodiment. It is a figure which shows the actual measured value of a received light waveform when a finger | toe is normally set to the detection apparatus. It is a figure which shows the relationship between a received light pulse and a received light waveform. FIG. 5 is a diagram showing actual measured values of a received light waveform when the detection device is intentionally vibrated regularly without setting a finger. It is a figure which shows the actual measured value of the received light waveform when disturbance light is intentionally applied to the light-receiving device in the state which is vibrating the detection device. The intentional application of disturbance light means that the light receiving device 113 is intentionally directed toward the disturbance light. It is a figure which shows the actual measured value of a received light waveform when a detection apparatus is left still in the state which has not set the finger to the detection apparatus. It is a flowchart which shows the procedure of the whole process in the pulse wave detection process which concerns on 1st Embodiment. It is a flowchart which shows the procedure of the light quantity adjustment process which concerns on 1st Embodiment. It is a flowchart which shows the procedure of the dozing detection / prevention process which concerns on 1st Embodiment. It is a flowchart which shows the procedure of the tension state detection process which concerns on 1st Embodiment. It is a figure which shows the structural example of the pulse-wave detection system which concerns on 2nd Embodiment. It is a flowchart which shows another procedure of the dozing detection / prevention process which concerns on 2nd Embodiment. It is a figure which shows the structural example of the pulse-wave detection system which concerns on 3rd Embodiment. It is a figure which shows the reflective sensor apparatus which concerns on 4th Embodiment. It is a figure which shows the transmission type sensor apparatus which concerns on 4th Embodiment. It is a figure which shows another example of the light emission pattern and light reception pattern which concern on 4th Embodiment. It is a figure which shows the structural example of the pulse-wave detection system which concerns on 5th Embodiment. It is a figure which shows the example of the light emission pattern and light reception pattern which concern on 6th Embodiment. It is a figure which shows the example of the light emission pattern and light reception pattern which concern on 7th Embodiment.

Next, modes for carrying out the present invention (referred to as “embodiments”) will be described in detail with reference to the drawings as appropriate. In addition, in each drawing, about the same component, the same code | symbol is attached | subjected and description is abbreviate | omitted.

[First Embodiment]
<System configuration>
FIG. 1 is a diagram illustrating a configuration example of a pulse wave detection system according to the first embodiment.
The pulse wave detection system 10 includes a detection device (detection unit) 1, a control device 2, and an output device (output unit) 3.
The detection device 1 is provided on the back surface of a steering (operation unit) 4 mounted on a vehicle (moving body), and detects a pulse wave of blood on the finger when the user touches the finger. The detailed configuration of the detection device 1 will be described later. The front side of the steering 4 is the side facing the driver (user) during driving, and the back side is the opposite side of the front side.
The control device 2 acquires information on the received light waveform from the detection device 1, determines whether the user touches the detection device 1 with a finger based on the acquired information on the received light waveform, determines the state of the pulse, Information is output from the output device 3 based on each determination result, or the vehicle is stopped. The received light waveform is light received by the light receiving device 113 (FIGS. 3 and 4) in the detection device 1.

The output device 3 includes a display device 31 and a sound device 32, and displays information on the display device 31 and outputs sound from the sound device 32 based on an instruction from the control device 2.
In FIG. 1, the position where the detection device 1 is installed in the steering 4 is a position assuming that the detection device 1 is touched with an index finger, but is not limited to this, and detection with another finger is also possible. It may be installed at an assumed position, or may be installed on the front side of the steering 4 and assumed to be detected by the thumb.

FIG. 2 is an AA cross section of the steering in FIG.
As shown in FIG. 2, the detection device 1 includes a sensor device 101 and a substrate device 102. The sensor device 101 will be described later. The substrate device 102 includes a circuit for controlling the sensor device 101 and transmitting a signal to the control device 2.
As shown in FIG. 2, in this embodiment, when the user's finger 5 touches the detection device 1, external light is blocked.

<Detection device>
3 and 4 are diagrams illustrating the configuration of the sensor device of the detection device according to the first embodiment.
FIG. 3 is a diagram illustrating a reflective sensor device.
As shown in FIG. 3, the sensor device 101a (101) includes a visible light emitting device (light emitting unit) 111a (111), an infrared light emitting device (light emitting unit) 112a (112), and a light receiving device 113a (113). have.
The visible light emitting device 111a emits visible light (specifically, red light, green light, etc.), specifically visible light (specifically, red light, green light, etc.). Is a light emitting diode.
The infrared light emitting device 112a emits infrared light, and is specifically a light emitting diode that emits infrared light.
The light receiving device 113a receives light emitted from the visible light emitting device 111a and the infrared light emitting device 112a and reflected by the finger 5, and is specifically a photodiode, a phototransistor, or the like.
In FIG. 3, one light receiving device 113a is provided, and light emitted from the visible light emitting device 111a and the infrared light emitting device 112a is received by one light receiving device 113a. A light receiving device 113 corresponding to each of the infrared light emitting devices 112a may be provided.

In the diagram shown in FIG. 3, the light receiving device 113a is sandwiched between the visible light emitting device 111a and the infrared light emitting device 112a, but the light receiving device 113a is formed with the visible light emitting device 111a and the infrared light emitting device 112a. 3 is not limited to the configuration shown in FIG. 3 as long as it can receive the light emitted from and reflected by the finger 5.

FIG. 4 is a diagram showing a transmissive sensor device.
The reflective sensor device 101a shown in FIG. 3 receives the light reflected by the finger 5, while the transmissive sensor device 101b shown in FIG. 4 receives the light transmitted through the finger 5.
Therefore, the sensor device 101b (101) shown in FIG. 4 has a covering portion 115 that covers the finger 5, and the visible light emitting device 111b (on the back side of the finger 5 when the finger 5 is inserted into the covering portion 115). 111) and an infrared light emitting device 112b (112).
Further, two light receiving devices 113b and 113c (113) are provided on the belly side of the finger 5 when the finger 5 is inserted into the covering portion 115 so as to correspond to the visible light emitting device 111b and the infrared light emitting device 112b, respectively. Is provided. Here, the light receiving device 113b receives visible light emitted from the visible light emitting device 111b. The light receiving device 113c receives visible light emitted from the infrared light emitting device 112b.

In the pulse wave detection system 10 according to the present embodiment, it is desirable to use the reflective sensor device 101a shown in FIG. 3 because it is provided in the steering 4, but the transmissive sensor device 101b shown in FIG. 4 may be used. .

<Configuration of control device>
FIG. 5 is a diagram illustrating a configuration of the control device according to the first embodiment.
The control device 2 may be mounted on, for example, an ECU (Engine Control Unit), or may be provided in the vehicle as the control device 2 different from the ECU.
The control device 2 includes a memory 201, a storage device 202, a CPU (Central Control Unit) 203, and an input device 204.
When the program is executed by the CPU 203, the memory 201 includes a control unit 211, a pulse wave detection processing unit 212 that constitutes the control unit 211, a pulse determination processing unit 213, a situation determination processing unit 214, an authentication unit 215, and an optimum light amount. The processing unit 216, the vehicle control unit 217, and the output processing unit (instruction unit) 218 are embodied.

The pulse wave detection processing unit 212 determines whether or not the user has set the finger 5 on the detection device 1 by determining whether or not a criterion described later is satisfied.
The pulse determination processing unit 213 calculates a pulse from the frequency of the received light waveform received by the light receiving device 113 (see FIGS. 3 and 4) when the finger 5 is correctly set on the detection device 1, and the frequency within a predetermined range. It is determined whether or not the calculated pulse is normal.

The situation determination processing unit 214 determines whether or not it is easy to doze based on whether the speed is constant for a predetermined time or whether the operation amount of the steering 4 is equal to or less than the predetermined amount for a predetermined time. judge.
The authentication unit 215 performs user personal authentication processing based on a password, fingerprint information, or the like input from the input device 204.
When the intensity of light emitted from the visible light emitting device 111 or the infrared light emitting device 112 is low, the light amount optimization processing unit 216 adjusts the intensity to an optimum intensity.
When an abnormality is recognized in the driver's state, the vehicle control unit 217 stops the vehicle by operating a brake, a handle, or the like.
The output processing unit 218 displays information on the display device 31 (see FIG. 1) that is the output device 3 and outputs sound from the sound device 32.
Details of processing performed by each unit 210 to 218 will be described later.

The storage device 202 is a storage medium such as a ROM (Read Only Memory) and stores allowable range data 221. The allowable range data 221 stores allowable values for conditions (A1) to (A5) described later.
The input device 204 receives information related to a received light waveform sent from the detection device 1 while the user inputs information related to a password and a fingerprint.

<Light emitting pattern and light receiving pattern>
FIG. 6 is a diagram illustrating an example of a light emitting pattern and a light receiving pattern according to the first embodiment.
FIG. 6 shows a visible light emission pattern, an infrared light emission pattern, and a light reception pattern by the light receiving device 113 in order from the top. Here, the visible light is monochromatic light in visible light such as red light or green light. In FIG. 6, the horizontal axis indicates time, and the vertical direction indicates light intensity.
As shown in FIG. 6, visible light and infrared light are emitted in a pulsed light emission pattern. In FIG. 6, the period of each pulse is about 1 ms, but the present invention is not limited to this.
As shown in FIG. 6, the visible light V1 is emitted from the visible light emitting device 111 at time t1. The infrared light IR1 is emitted from the infrared light emitting device 112 at time t2, the visible light V2 is emitted from the visible light visible light emitting device 111 at time t3, and the infrared light from the infrared light emitting device 112 is infrared at time t4. Light IR2 is emitted.
As shown in FIG. 6, the intensities of the visible light emitted from the visible light emitting device 111 and the infrared light emitted from the infrared light emitting device 112 are constant.

The light receiving device 113 receives the light receiving pulse R1 at time t1, receives the light receiving pulse R2 at time t2, receives the light receiving pulse R3 at time t3, and receives the light receiving pulse R4 at time t4.
Here, the pulse wave detection processing unit 212 in the control device 2 determines whether the received light pulse received by the light receiving device 113 is derived from visible light or infrared light from the light emission timing.

That is, since the received light pulse R1 is received at the time t1 when the visible light V1 is emitted, the pulse wave detection processing unit 212 determines that the received light pulse R1 is derived from the visible light V1.
Similarly, since the received light pulse R2 is received at time t2, which is the timing when the infrared light IR1 is emitted, the pulse wave detection processing unit 212 determines that the received light pulse R2 is derived from the infrared light IR1. .
Hereinafter, similarly, the pulse wave detection processing unit 212 determines that the received light pulse R3 received at time t3 is derived from the visible light V2, and the received light pulse R4 received at time t4 is derived from the infrared light IR2. Is determined.

<Difference between pulse wave and ambient light>
FIG. 7 is a diagram showing actual measured values of the received light waveform when the finger is normally set on the detection device. Here, the received light waveform is a waveform of light received by the light receiving device 113.
Here, the received light waveforms in FIGS. 7 and 9 to 11 will be described with reference to FIG.
FIG. 8 is a diagram showing the relationship between the received light pulse and the received light waveform.
In FIG. 8, a light reception pulse 401 indicated by a solid line is a light reception pulse derived from visible light, and a light reception pulse 402 indicated by a broken line is a light reception pulse derived from infrared light.
If the light emission pulse has a constant intensity as shown in FIG. 6, the light reception pulses 401 and 402 should also be constant. However, as will be described later, the light reception pulse 401 or 402 is absorbed or reflected by the finger 5 when it is reflected or transmitted. The intensity of the received light pulses 401 and 402 changes due to the influence of light.

The solid line 411 connecting the peak values of the received light pulses 401 derived from visible light is the received light waveform derived from visible light. Similarly, a broken line connecting the peak values of the received light pulses 402 derived from infrared light is a received light waveform derived from infrared light 412.

Here, FIG. 7 which is a figure which shows a light-receiving waveform when the finger | toe 5 is normally set to the detection apparatus 1 again is referred.
In FIG. 7, a solid line 301a (301) indicates a received light waveform derived from visible light, and a broken line 302a (302) indicates a received light waveform derived from infrared light.
The reason why the received light waveforms 301 and 302 appear smooth in FIGS. 7 and 9 to 11 is that the interval between the received light pulses is as short as 1 ms. 7 and 9 to 16, the transmissive sensor device 101b is used. However, similar results can be obtained with the reflective sensor device 101a.
In the diagrams shown in FIGS. 7 and 9 to 11, the horizontal axis represents time, and the vertical axis represents signal values in arbitrary units.
Also, in the diagrams shown in FIGS. 7 and 9 to 11, the direct current component is subtracted, nothing is set, and the light reception waveform is adjusted to be 0 when it is left standing.

When the finger 5 is normally set on the detection device 1, light is absorbed by the blood flow caused by the pulse, and a pulsation as shown in FIG. 7 is observed.
In the state where the finger 5 is set on the detection device 1, the received light waveform (solid line 301a) derived from visible light and the received light waveform derived from infrared light (broken line 302a) have substantially the same phase according to the pulse. It becomes the waveform.
Reference numerals 311 to 315 will be described later.

FIG. 9 is a diagram showing actual measured values of the received light waveform when the detection device is intentionally vibrated regularly without the finger being set.
This vibration simulates the vibration during driving of the vehicle.
In FIG. 9, a solid line 301b (301) indicates a received light waveform derived from visible light, and a broken line 302b (302) indicates a received light waveform derived from infrared light.
When the detection device 1 is vibrated, light enters from the outside of the detection device 1 (hereinafter, the entered light is referred to as disturbance light). The light receiving device 113 receives disturbance light in addition to the light emitted from each of the visible light emitting device 111 and the infrared light emitting device 112. Since the detection device 1 vibrates irregularly, the light intensity derived from the disturbance light is added to the light emitted from the visible light emitting device 111 and the infrared light emitting device 112 in accordance with the vibration.
As a result, the light receiving device 113 obtains a light receiving waveform as shown in FIG.
Reference numerals 321 to 325 will be described later.

FIG. 10 is a diagram showing actual measured values of the received light waveform when disturbance light is intentionally applied to the light receiving device in a state where the detecting device is vibrated. The intentional application of disturbance light means that the light receiving device 113 is intentionally directed toward the disturbance light.
In FIG. 10, a solid line 301c (301) indicates a received light waveform derived from visible light, and a broken line 302c (302) indicates a received light waveform derived from infrared light.
As shown in FIG. 10, when disturbance light enters the detection device 1, strong peaks are generated in both visible light and infrared light. In the received light waveform shown in FIG. 10, the peak timing and the intensity value of visible light and infrared light are almost the same at a place where a strong peak is generated, but the peak timing and the intensity value are the same at other places. Are inconsistent between visible light and infrared light.
Reference numerals 331 to 336 will be described later.

FIG. 11 is a diagram showing actual measured values of the received light waveform when the detection device is left standing with no finger set on the detection device.
In FIG. 11, a solid line 301d (301) indicates a received light waveform derived from visible light, and a broken line 302d (302) indicates a received light waveform derived from infrared light.
As described above, since the direct-current component is removed from the light reception waveform of FIG. 11, the light reception waveform should change with the signal value “0” when the detection apparatus 1 is left stationary. Because there is, there is noise.

In the pulse wave detection system 10 according to the first embodiment, the received light waveform when the finger 5 is set as shown in FIG. 7 and the received light waveform when the finger 5 is not set as shown in FIGS. Are determined according to the following criteria. That is, when the received light waveform of visible light and the received light waveform of infrared light satisfy the following conditions, the pulse wave detection system 10 determines that the finger 5 is set.
(A1) The peaks of the visible light reception waveform and the infrared light reception waveform coincide with each other. Alternatively, the peak shift in the visible light reception waveform and the infrared light reception waveform is within the allowable range. This means that the received light waveform of visible light and the phase of infrared light match, or the phase shift between the received light waveform of visible light and the received light waveform of infrared light is within an allowable range. ing. In the state where the finger 5 is not set, as shown in FIG. 9, the peak positions of the received light waveform of visible light and the received light waveform of infrared light are shifted (that is, the phase is shifted).
When the condition (A1) is satisfied for a predetermined time, the pulse wave detection system 10 desirably determines that the condition (A1) is satisfied.

(A2) In the same received light waveform, the difference in intensity between adjacent peaks is within an allowable range. When the condition (A2) is satisfied in both the visible light reception waveform and the infrared light reception waveform, the pulse wave detection system 10 determines that the condition (A2) is satisfied. When the finger 5 is not set, the intensity at the adjacent peak varies as shown in FIG.
When the condition (A2) is satisfied for a predetermined time, the pulse wave detection system 10 desirably determines that the condition (A2) is satisfied.

(A3) The intensity ratio or intensity difference at the peak of the received light waveform of visible light and infrared light is constant or within an allowable range. Note that it is preferable to determine whether or not the condition (A3) is satisfied for a predetermined time. The intensity ratio is represented by, for example, the intensity of visible light / infrared light.

(A4) The intensity of the peak is a value within a predetermined range. When the condition (A4) is satisfied in both the visible light reception waveform and the infrared light reception waveform, the pulse wave detection system 10 determines that the condition (A4) is satisfied. When the finger 5 is not set, the peak intensity is a large value (a value larger than the predetermined range) or a small value (a value smaller than the predetermined range) as shown in FIG.
When the condition (A4) is satisfied for a predetermined time, the pulse wave detection system 10 desirably determines that the condition (A4) is satisfied.
(A5) The period of visible light and infrared light is a constant time, a predetermined period, or a period within an allowable range from the predetermined period. The predetermined cycle is preferably about 1 second (frequency 1 Hz) which is a general pulse of a person.

The allowable range under the conditions (A1) to (A5) is stored in the allowable range data 221 in the storage device 202.

Here, when all of the conditions (A1) to (A5) are satisfied, the pulse wave detection system 10 determines that the finger 5 is set on the detection device 1. Note that not all of the above conditions (A2) to (A5) may be used. That is, all of the above conditions (A2) to (A5) may not be used, or at least one of the above conditions (A2) to (A5) may be used.

Next, the conditions (A1) to (A5) will be described in detail with reference to FIGS. 7 and 9 to 11. FIG.
First, referring to FIG.
In FIG. 7, as indicated by reference numerals 311, 312, and 313, the peak timings of the visible light reception waveform (solid line 301a) and the infrared light reception waveform (broken line 302a) are substantially the same. Therefore, the received light waveform shown in FIG. 7 satisfies the condition (A1).
And the intensity | strength in the peak shown to the code | symbol 311 and the peak shown to the code | symbol 312 is a substantially the same value. That is, the difference in intensity between the peak indicated by reference numeral 311 and the peak indicated by reference numeral 312 is within a predetermined range (see reference numeral 314). Similarly, the peak indicated by reference numeral 312 and the peak indicated by reference numeral 313 have substantially the same value (see reference numeral 315).
Thus, the intensities at adjacent peaks in the received light waveform of infrared light shown in FIG. 7 are substantially the same value. The same applies to visible light. Therefore, the received light waveform shown in FIG. 7 satisfies the condition (A2).

Furthermore, at the peaks indicated by reference numerals 311, 312, and 313, the intensity ratio of visible light and infrared light is substantially constant. Therefore, the received light waveform shown in FIG. 7 satisfies the condition (A3).
And in the peak shown to the code | symbol 311,312,313, the intensity | strength of visible light and infrared light becomes a value within the predetermined range. Therefore, the received light waveform shown in FIG. 7 satisfies the condition (A4).
In addition, the period of the pulse wave is substantially a predetermined period for both visible light and infrared light. Therefore, the received light waveform shown in FIG. 7 satisfies the condition (A5).
Therefore, the received light waveform shown in FIG. 7 satisfies all the conditions (A1) to (A5).

Reference is now made to FIG.
As shown in FIG. 9, for example, as indicated by reference numerals 321 and 322, the peaks of the visible light reception waveform (solid line 301b) and the infrared light reception waveform (broken line 302b) are shifted. Therefore, the received light waveform shown in FIG. 9 does not satisfy the condition (A1).
Further, as indicated by reference numeral 323, in the infrared light, the intensity at adjacent peaks is greatly different. The same applies to visible light. Therefore, the received light waveform shown in FIG. 9 does not satisfy the condition (A2).

Furthermore, as indicated by reference numerals 324 and 325, the intensity ratio of visible light and infrared light is not constant (fluctuates) at the peak. Therefore, the received light waveform shown in FIG. 9 does not satisfy the condition (A3).
Note that the peak intensity in the visible light reception waveform and the infrared light reception waveform is within a predetermined range, so the light reception waveform shown in FIG. 9 satisfies the condition (A4). In addition, the period of the pulse wave is substantially a predetermined period for both visible light and infrared light. Therefore, the received light waveform shown in FIG. 9 satisfies the condition (A5).
That is, the received light waveform shown in FIG. 9 satisfies the conditions (A4) and (A5), but does not satisfy the conditions (A1) to (A3).

Reference is now made to FIG.
First, at reference numerals 331 and 332, the peaks in the visible light reception waveform (solid line 301 c) and the infrared light reception waveform (broken line 302 c) are substantially the same. However, the peaks indicated by reference numerals 333 and 334 do not match the peak in the visible light reception waveform and the infrared light reception waveform. Therefore, the received light waveform shown in FIG. 10 does not satisfy the condition (A1).
As indicated by reference numeral 335, in infrared light, there are places where the intensity at adjacent peaks is substantially the same, while as indicated by reference numeral 336, there are places where the intensity at adjacent peaks are greatly different. Therefore, the received light waveform shown in FIG. 10 does not satisfy the condition (A2).

And as shown to the code | symbol 333,334, the intensity ratio in the peak of the light reception waveform of visible light and infrared light is changing a lot. Therefore, the received light waveform shown in FIG. 10 does not satisfy the condition (A3).
Furthermore, since the peak intensity of both visible light and infrared light is not within the predetermined range, the received light waveform shown in FIG. 10 does not satisfy the condition (A4).
Since the period of the pulse wave is not a predetermined period for both visible light and infrared light, the received light waveform shown in FIG. 10 does not satisfy the condition (A5).
That is, the received light waveform shown in FIG. 10 does not satisfy any of the conditions (A1) to (A5).

Reference is now made to FIG.
The received light waveform shown in FIG. 11 does not have a clear peak. Therefore, the received light waveform shown in FIG. 11 does not satisfy any of the conditions (A1) to (A5).
As described above, all of the conditions (A2) to (A5) may not be used, or at least one of the conditions (A2) to (A5) may be used.
As described above, the more the conditions (A1) to (A5) are used, the more the pulse wave detection accuracy can be improved.

<Flowchart>
(Overall processing)
FIG. 12 is a flowchart showing a procedure of overall processing in the pulse wave detection processing according to the first embodiment.
First, the user turns on the ignition (S101). Incidentally, if the vehicle is an EV (Electric Vehicle), the user turns on the power.
Then, the control unit 211 (see FIG. 5) performs light amount adjustment processing (S102). Details of the light amount adjustment processing will be described later.
After the light amount adjustment process is completed, the user starts driving the vehicle (S103). That is, the subsequent processing is processing that is performed while the vehicle is driving (the vehicle is moving).
Next, the control unit 211 performs dozing detection / prevention processing (S104). Details of the dozing detection / prevention process will be described later.
And the control part 211 performs a tension state detection process (S105). Details of the tension state detection process will be described later.
Thereafter, the control unit 211 returns the process to step S104, and repeats the processes of step S104 and step S105 until the ignition is turned off.

(Light intensity adjustment process)
FIG. 13 is a flowchart illustrating a procedure of light amount adjustment processing according to the first embodiment. The process of FIG. 13 shows the process of step S102 of FIG. 12 in detail.
First, the authentication unit 215 (see FIG. 5) performs personal authentication processing (S201). For personal authentication, password, fingerprint authentication or the like is used. Note that the process of step S201 may be omitted.
Next, the output processing unit 218 notifies the detection device 1 to touch through the output device 3 (see FIG. 1) (S202).
Then, the pulse wave detection processing unit 212 determines whether or not a pulse wave is detected (S203). A method for determining whether or not a pulse wave has been detected is determined by whether or not all the conditions (A1) to (A5) described above are satisfied.
If no pulse wave is detected as a result of step S203 (S203 → No), the control unit 211 returns the process to step S202.

If a pulse wave is detected as a result of step S203 (S203 → Yes), the light amount optimization processing unit 216 performs light amount optimization processing (S204). The light quantity optimization process is performed in the following procedure, for example.
(B1) First, the light quantity optimization processing unit 216 (see FIG. 5) determines whether or not the intensity of the light received by the light receiving device 113 is within a predetermined intensity range.
(B2) If the intensity of the received light is not within the predetermined intensity range, the light quantity optimization processing unit 216 increases or decreases the intensity of the light emitted from the light emitting device by a predetermined degree.
(B3), the light quantity optimization processing unit 216 determines again whether or not the intensity of the light received by the light receiving device 113 is within a predetermined intensity range. Hereinafter, the light quantity optimization processing unit 216 repeats the processes (B1) and (B2) until the intensity of the light received by the light receiving device 113 falls within a predetermined intensity range.
The light quantity optimization process does not have to be based on the processes (B1) to (B3).
After step S204, the pulse wave detection processing unit 212 continues to measure the pulse wave for a predetermined period, and stores the pulse wave data for the predetermined period in the storage device 202 (S205).

Next, the pulse determination processing unit 213 performs a user health check based on the pulse wave data stored in step S205 (S206). Here, the content of the health check to be performed is to check stress / fatigue, etc., because there is a risk of circulatory system disease and the balance of sympathetic and parasympathetic nerves is abnormal. These health checks are performed using the technique described in Japanese Patent Application Laid-Open No. 2008-234003. Also, it is checked that the pulse rate is approximately 1 Hz, for example, 40 to 130 times per minute.
Then, the pulse determination processing unit 213 determines whether or not the result of the health check in step S206 is normal (S207).

If the result of step S207 is not normal (S207 → No), the output processing unit 218 causes the output device 3 to output a warning (S208). The warning is preferably issued from the audio device 32.
If the result of step S207 is normal (S207 → Yes), the control unit 211 returns the process to step S103 of FIG.
In the first (B1), if the intensity of the light received by the light receiving device 113 is within a predetermined range, the process of step S204 is not performed.
In step S203, when the control unit 211 detects S203 → No a predetermined number of times, the vehicle control unit 217 may stop the vehicle.
Further, the processing in steps S206 to S208 may be omitted.

(Dozing detection / prevention process)
FIG. 14 is a flowchart showing the procedure of the dozing detection / prevention process according to the first embodiment. The process of FIG. 14 shows the process of step S104 of FIG. 12 in detail.
First, the situation determination processing unit 214 (see FIG. 5) determines whether or not it is a situation where it is easy to doze (possibly causing drowsiness) (S301). The situation determination processing unit 214, for example, whether a state where the speed is estimated to be easily drowsy on a highway or the like continues for a predetermined time, or whether the operation amount of the steering 4 is a predetermined amount or less continues for a predetermined time. Based on this, it is determined whether or not it is easy to doze.
If the result of step S301 is that it is not easy to doze (S301 → No), the process returns to step S105 in FIG.

If the result of step S301 is that it is easy to fall asleep (S301 → Yes), the output processing unit 218 notifies the user to touch the detection device 1 via the output device 3 (S302). The notification is performed by displaying on the display device 31 or by generating sound from the sound device 32.
The pulse wave detection processing unit 212 determines whether or not a pulse wave is detected (S311). The method of determining whether or not the pulse wave has been detected is determined by determining whether or not all of the above conditions (A1) to (A5) are satisfied, for example.

If a pulse wave is detected as a result of step S311 (S311 → Yes), the pulse determination processing unit 213 determines whether the pulse wave is normal (S312). The pulse determination processing unit 213 calculates the pulse based on the pulse wave, and determines whether or not the pulse wave is normal by determining whether or not the frequency (ie, cycle) of the detected pulse wave is within a predetermined range. judge.
As a result of step S312, when the pulse wave is normal (S312 → Yes), the control unit 211 returns the process to step S105 of FIG.
As a result of step S312, if the pulse wave is not normal (S312 → No), the pulse determination processing unit 213 determines that the user is in an abnormal state (S313), and the vehicle control unit 217 stops the vehicle (S314). The process is terminated. It is desirable that the vehicle control unit 217 does not stop the vehicle suddenly, but blinks the hazard and stops the vehicle after placing it on the road shoulder.

On the other hand, as a result of step S311, when the pulse wave is not detected even after a predetermined time has passed (S311 → No), the output processing unit 218 notifies the user again to touch the detection device 1 (S321). In step S321, it is desirable to make a notice more conspicuous than the notice in step S302. Notifying conspicuously means making a buzzer sound, making the sound louder than in step S302, or the like.

Thereafter, the pulse wave detection processing unit 212 determines whether or not a pulse wave is detected (S322). The determination method in step S322 is the same method as in step S311.
When the pulse wave is detected as a result of step S322 (S322 → Yes), the output processing unit 218 notifies the user again that there is drowsiness (S323), and the control unit 211 returns the process to step S105 of FIG. .
Further, as a result of step S322, when the pulse wave is not detected even after a predetermined time has elapsed (S322 → No), the pulse wave detection processing unit 212 determines that it is abnormal (S313), and the vehicle control unit 217 stops the vehicle ( S314).

In addition, even if it performs the process of step S321 twice or more and performs a predetermined number of times, when the pulse wave is not detected in step S322, the control part 211 may be made to perform the process of step S313 and step S314.

(Tension state detection process)
FIG. 15 is a flowchart showing a procedure of tension state detection processing according to the first embodiment. The process in FIG. 15 shows the process in step S105 in FIG. 12 in detail.
First, the pulse wave detection processing unit 212 determines whether or not a predetermined time has elapsed since the end of the previous tension state detection process (S401).
As a result of step S401, when the predetermined time has not elapsed since the end of the previous tension state detection process (S401 → No), the control unit 211 returns the process to step S104 of FIG.
As a result of step S401, when the predetermined time has elapsed since the end of the previous tension state detection process (S401 → Yes), the output processing unit 218 notifies the user to touch the detection device 1 via the output device 3. (S402). The notification is performed by displaying on the display device 31 or by generating sound from the sound device 32.
Then, the pulse wave detection processing unit 212 determines whether or not a pulse wave is detected (S411). The method for determining whether or not the pulse wave has been detected is determined by whether or not the above conditions (A1) to (A5) are satisfied.

As a result of step S411, if the pulse wave is not detected even after a predetermined time has elapsed (S411 → No), the output processing unit 218 notifies the user again to touch the detection device 1 via the output device 3 (S412). In step S412, it is desirable to make a notice more conspicuous than the notice in step S402. Notifying conspicuously means making a buzzer sound, making the sound louder than in step S402, or the like. The output processing unit 218 may cause the display device 31 to display an instruction to touch the detection device 1 when the buzzer sounds.

Thereafter, the pulse wave detection processing unit 212 determines whether or not a pulse wave is detected (S413). The determination method in step S413 is the same method as in step S411.
When the pulse wave is detected as a result of step S413 (S413 → Yes), the control unit 211 advances the process to step S421.

As a result of step S413, when the pulse wave is not detected even after a predetermined time has elapsed (S413 → No), the pulse wave detection processing unit 212 determines that it is abnormal (S414), and the vehicle control unit 217 stops the vehicle (S415). The process is terminated.

On the other hand, when the pulse wave is detected as a result of step S411 or step S413 (S411, S413 → Yes), the pulse determination processing unit 213 calculates the current pulse based on the pulse wave obtained from the detection device 1, and operates. It is determined whether or not the state where the pulse is fast compared to the start time continues (S421). Here, the pulse at the start of operation is a pulse calculated based on the pulse wave data stored in the storage device 202 in step S205 of FIG.

As a result of step S421, when the pulse is not fast compared to the start of operation (S421 → No), the control unit 211 returns the process to step S104 of FIG.
As a result of step S421, when the pulse is in a faster state than when the operation is started (S421 → Yes), the pulse determination processing unit 213 waits for a predetermined time (S422).
Then, the pulse determination processing unit 213 calculates the current pulse based on the pulse wave, and determines whether or not a state in which the calculated pulse is fast continues (S423). In addition, between step S421 and step S423, the output processing unit 218 may instruct the user not to separate the finger 5 from the detection device 1 via the output device 3. Alternatively, the output processing unit 218 may notify the user again of touching the detection device 1 via the output device 3 immediately before step S423. That is, between step S421 and step S423, the user may keep touching the finger 5 with the detection apparatus 1 or may keep the finger 5 away from the detection apparatus 1.

As a result of step S423, when the state where the pulse is fast does not continue (S423 → No), the control unit 211 returns the process to step S104 of FIG.
As a result of step S423, when the state where the pulse is fast continues (S423 → Yes), the output processing unit 218 notifies the user that it is in a tension state (S424), and the control unit 211 performs the process to step S104 in FIG. To return. In step S424, since the output processing unit 218 is in a tension state, the output processing unit 218 may notify the user that it is better to take a break.

Furthermore, in this embodiment, light of two wavelengths is used, but light of three or more wavelengths may be used. That is, the sensor device 101 may include three or more light emitting devices.
Further, the output processing unit 218 may notify the user that the detection device 1 may release his / her hand through the output device 3 every time Steps S102, S104, and S105 in FIG.

According to the first embodiment, the pulse wave detection system 10 is based on whether or not the conditions (A1) to (A5) described above are satisfied. The received light waveform (pulse wave) is distinguished. By doing in this way, the pulse wave detection system 10 can detect a user's pulse wave correctly also in the condition where disturbance light injects.

As described above, in the situation of driving a vehicle or the like, unlike the measurement on the bed, noise due to vibration or the like is generated, so the difference between the noise and the pulse wave derived from the user's pulse can be easily simplified. Finding is the point.
The technique described in Patent Document 1 prevents disturbance light from entering. Therefore, when installing in a vehicle etc., the structure for preventing disturbance light from entering is needed, and it is difficult to detect a pulse wave correctly in the state where disturbance light is easy to enter.

In contrast, the pulse wave detection system 10 according to the present embodiment is premised on the presence of ambient light. For this reason, the pulse wave detection system 10 having high robustness against disturbance light can be provided. That is, the pulse wave detection system 10 according to the present embodiment can easily determine whether the received light waveform is derived from the measurement target or the received light waveform from the disturbance light even while the moving body is moving.

Further, in the pulse wave detection system 10 according to the present embodiment, the sensor device 101 emits light of different wavelengths such as infrared light and visible light, and the light receiving device 113 receives light of these different wavelengths. In addition, since it is possible to increase the number of discriminating elements when discriminating the light reception waveforms of the pulse wave and the disturbance light, it is possible to improve the discrimination accuracy between the pulse wave and the disturbance light.

Furthermore, the pulse wave detection system 10 according to the present embodiment uses an existing sensor device 101 used in a pulse oximeter or the like by using a reflective sensor device 101a or a transmissive sensor device 101b. Can be used.
Further, the pulse wave detection system 10 according to the present embodiment can easily detect a pulse wave even when the vehicle is in operation, by providing the detection device 1 in the steering 4.

The pulse wave detection system 10 according to the present embodiment uses the finger 5 as the pulse wave measurement target, thereby reducing the size of the detection device 1 and generating a pulse wave without greatly moving the hand even while the vehicle is being driven. Can be detected.
The pulse wave detection system 10 according to the present embodiment determines whether or not the situation determination processing unit 214 is likely to fall asleep (possibility of causing drowsiness). The unit 218 notifies the detection device 1 to touch the finger via the output device 3. Thereafter, the pulse wave detection processing unit 212 determines the presence or absence of pulse wave detection. By doing in this way, it can be determined easily whether the user (driver) is dozing, and safety can be improved.

Furthermore, the pulse wave detection system 10 according to the present embodiment determines the possibility that the user is drowsy or the possibility that the user is in tension based on the frequency (pulse) of the pulse wave, and the result To be notified. By doing in this way, the pulse wave detection system 10 which concerns on this embodiment can perform notification according to a user's state, and can improve the safety | security of a driving | operation.

[Second Embodiment]
FIG. 16 is a diagram illustrating a configuration example of a pulse wave detection system according to the second embodiment.
In the pulse wave detection system 10A in FIG. 16, the configurations of the control device 2 and the output device 3 are the same as those in FIG.
In the view shown in FIG. 16, a plurality of detection devices 1 are provided on the back surface of the steering 4. By doing so, it is possible to detect a change in the position of the gripping hand on the steering 4.

FIG. 17 is a flowchart showing another procedure of the dozing detection / prevention process according to the second embodiment. The process in FIG. 17 shows the process in step S104 in FIG. 12 in detail. Moreover, the process of FIG. 17 is a process applied to the pulse wave detection system 10A provided with a plurality of detection devices 1 as shown in FIG. That is, in the second embodiment, the process of FIG. 17 is performed instead of the process of FIG.
First, the pulse wave detection processing unit 212 determines whether or not a pulse wave is detected continuously for a predetermined time by a part of the detection devices 1 among the plurality of detection devices 1 provided (S501). The pulse wave detection method is determined by whether or not the above conditions (A1) to (A5) are satisfied. When some of the detection devices 1 detect pulse waves continuously for a predetermined time, the pulse wave detection processing unit 212 determines that there is a possibility of drowsiness because the steering wheel operation is stopped.

As a result of step S501, when some of the detection devices 1 have not detected a pulse wave continuously for a predetermined time (S501 → No), the control unit 211 returns the process to step S105 of FIG.
As a result of step S501, when some of the detection devices 1 continuously detect a pulse wave for a predetermined time (S501 → Yes), the pulse determination processing unit 213 determines whether or not the pulse is late (S502). ). Whether or not the pulse is late is determined by whether or not the frequency (that is, the period) of the detected signal is smaller than the previously measured frequency. The pulse determination processing unit 213 determines that there is a possibility of drowsiness when the pulse is slow.

If the pulse is not delayed as a result of step S502 (S502 → No), the control unit 211 returns the process to step S105 of FIG.
If the pulse is late as a result of step S502 (S502 → Yes), the output processing unit 218 notifies the user that there is a possibility of drowsiness via the output device 3 (S503). The notification here is preferably a voice notification.
Thereafter, the output processing unit 218 notifies the user to touch another detection device 1 (S503).

Subsequently, the pulse wave detection processing unit 212 determines whether or not a pulse wave is detected from a detection device 1 different from the detection device 1 that is currently detecting the pulse wave (S511). The determination method in step S511 is the same method as in step S311.
As a result of step S511, when a pulse wave is detected from another detection device 1 (S511 → Yes), the output processing unit 218 notifies the user that there is drowsiness (S512), and the control unit 211 performs step S105 in FIG. Return to processing. This notification is preferably performed by the audio device 32.

As a result of step S511, when a pulse wave is not detected from another detection device 1 even after a predetermined time has elapsed (S511 → No), the pulse determination processing unit 213 determines that the user's state is abnormal (S513) and stops the vehicle. (S514).

Since the pulse wave detection system 10A according to the second embodiment determines whether or not sleepiness is caused by a change in the sensing position, it can easily determine whether or not sleepiness is caused.

[Third Embodiment]
FIG. 18 is a diagram illustrating a configuration example of a pulse wave detection system according to the third embodiment.
In addition, in the pulse wave detection system 10B in FIG. 18, the configurations of the control device 2 and the output device 3 are the same as those in FIG.
In the pulse wave detection system 10B shown in FIG. 18, for example, two detection devices 1 are provided at positions that are line-symmetric with respect to the central axis of the steering 4 in the vertical direction of the drawing. By setting it as such a structure, the control apparatus 2 can detect the pulse wave in the finger | toe of both hands.

In the case of the third embodiment, the pulse wave detection processing unit 212 determines whether or not the following condition (A6) is satisfied in addition to the above conditions (A1) to (A5). The wave detection processing unit 212 determines that the finger 5 is set on the detection device 1.
(A6) The received light waveforms (frequency, peak intensity ratio, etc.) acquired from the two detection devices 1 match or are within an allowable range. Note that the allowable range in the condition (A6) is stored in the allowable range data 221 in the storage device 202.

The pulse wave detection system 10B according to the third embodiment determines whether or not a pulse wave has been detected based on whether or not the received light waveforms derived from the fingers 5 of both hands coincide with each other. It is possible to prevent an event that a pulse wave is detected due to the deviation.

[Fourth Embodiment]
<Sensor device>
FIG. 19 is a diagram illustrating a reflective sensor device according to the fourth embodiment. In FIG. 19, the same components as those in FIG.
As shown in FIG. 19, the sensor device 101c (101) includes a visible light emitting device 111a (111) and a light receiving device 113a (113), and includes the infrared light emitting device 112a (112) in FIG. Absent. That is, the sensor device 101c shown in FIG. 19 can emit only visible light. Although FIG. 19 shows an example in which the infrared light emitting device 112 is not provided, the infrared light emitting device 112 and the light receiving device 113 are provided, and the visible light emitting device 111a (111) in FIG. 3 is provided. It is good also as a structure which is not.

FIG. 20 is a diagram illustrating a transmissive sensor device according to the fourth embodiment. In FIG. 20, the same components as those in FIG.
As shown in FIG. 20, the sensor device 101d (101) includes a visible light emitting device 111b (111) and a light receiving device 113b (113), and the infrared light emitting device 112b (112) and the infrared light shown in FIG. The light receiving device 113c (113) for light is not provided. That is, the sensor device 101d shown in FIG. 20 can emit and receive only visible light. Although FIG. 20 shows an example in which the infrared light emitting device 112 is not provided, the infrared light emitting device 112 and the infrared light receiving device 113 are provided, and visible light emission in FIG. 4 is performed. The device 111b and the light receiving device 113b for visible light may not be provided.

<Light emitting pattern and light receiving pattern>
FIG. 21 is a diagram illustrating another example of the light emitting pattern and the light receiving pattern according to the fourth embodiment.
FIG. 21 shows a visible light emission pattern and a light reception pattern by the light receiving device 113 in order from the top.
As shown in FIG. 21, one visible light emitting device 111 alternately emits light emission pulses with high intensity and light emission pulses with low intensity.
That is, as shown in FIG. 21, light E11 having a high intensity is emitted from the light emitting device at time t11. Then, light E12 having low intensity is emitted from the light emitting device at time t12, light E13 having high intensity is emitted from the light emitting device at time t13, and light E14 having low intensity is emitted from the light emitting device at time t14.
In FIG. 21, the interval between the light emission pulses E11 and E13 having a high intensity and the interval between the light emission pulses E12 and E14 having a low intensity is approximately 1 ms, but this is not restrictive.

The light receiving device 113 receives the light receiving pulse R11 at time t11, receives the light receiving pulse R12 at time t12, receives the light receiving pulse R13 at time t13, and receives the light receiving pulse R14 at time t14.
Here, the pulse wave detection processing unit 212 in the control device 2 determines whether the received light pulse received by the light receiving device 113 is derived from light with high intensity or light with low intensity from the light emission timing. This is because, as will be described later, when it is influenced by disturbance light, it is not possible to know whether the received light pulse is derived from light having a high intensity or from a light having low intensity.

That is, since the received light pulse R11 is received at time t11, which is the timing when the high intensity light E11 is emitted, the pulse wave detection processing unit 212 determines that the received light pulse R11 is derived from the high intensity light E11. To do.
Similarly, since the received light pulse R12 is received at time t12, which is the timing when the light E12 having a low intensity is emitted, the pulse wave detection processing unit 212 determines that the light reception pulse R12 is derived from the light E12 having a low intensity. judge.
Hereinafter, similarly, the pulse wave detection processing unit 212 determines that the received light pulse R13 received at time t13 is derived from the light E13 having high intensity, and converts the received light pulse R14 received at time t14 into light E14 having low intensity. Judged to be derived.

In the pulse wave detection system 10 according to the fourth embodiment, the detection device 1 can be configured with only the visible light emitting device 111 (or only the infrared light emitting device 112). Therefore, the detection device 1 can be reduced in size and cost can be reduced. Can be realized.

[Fifth Embodiment]
FIG. 22 is a diagram illustrating a configuration example of a pulse wave detection system according to the fifth embodiment.
In the pulse wave detection system 10C in FIG. 22, the configurations of the control device 2 and the output device 3 are the same as those in FIG.
In the pulse wave detection system 10 </ b> C shown in FIG. 22, the detection device 1 is provided on the side surface of the steering 4. In this way, the pulse wave can be detected with the palm.
In addition, in 5th Embodiment, it is set as the structure by which the detection apparatus 1 is provided in the side surface of the steering wheel 4, However, If it is a location which can be touched with a palm, it does not need to be the position shown in FIG. It is good also as a structure which touches with a palm in the state with which the detection apparatus 1 was provided in the position shown in FIG.
In FIG. 22, the size is the same as that in FIG. 1, but a larger detection device 1 may be provided.

In the pulse wave detection system 10C according to the fifth embodiment, since the user can detect the pulse wave with the palm, the pulse wave can be detected while the steering wheel is naturally gripped.

[Sixth Embodiment]
FIG. 23 is a diagram illustrating an example of a light emitting pattern and a light receiving pattern according to the sixth embodiment.
In FIG. 23, the emission intensity of visible light and the emission intensity of infrared light are changed. In the example of FIG. 23, the intensity of visible light is greater than the intensity of infrared light, but the present invention is not limited to this. By doing in this way, visible light and infrared light can be clearly distinguished.

[Seventh Embodiment]
FIG. 24 is a diagram illustrating an example of a light emitting pattern and a light receiving pattern according to the seventh embodiment.
In FIG. 24, the light emission pattern of visible light and the light emission pattern of infrared light are changed. By doing in this way, visible light and infrared light can be clearly distinguished.

In the first to seventh embodiments, it is assumed that the user is a driver of a vehicle (specifically, an automobile), but the present invention is not limited to this. The pulse wave detection system 10 according to the first to seventh embodiments can be applied to heavy equipment, trains, ships, airplanes, helicopters and the like. When the user is a heavy equipment worker, the determination in step S301 in FIG. 14 may be made except for whether a certain state continues for a predetermined time.
Even when mounted on a vehicle, the pulse wave detection system 10 (10A to 10C) can be mounted on an automobile driven by an engine, a hybrid vehicle, EV, FCV (Fuel Cell Vehicle) or the like.

In addition, the light having two wavelengths in the first to third embodiments and the fifth to seventh embodiments may be light having different wavelengths of hemoglobin in blood. By doing so, it is possible to calculate the blood oxygen saturation level of the user based on the principle of the pulse oximeter. Thereby, the pulse wave detection system 10 (10A to 10C) can check whether the user is in an oxygen deficient state or the like.

In addition, this invention is not limited to above-described embodiment, Various modifications are included. For example, the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to having all the configurations described. In addition, a part of the configuration of a certain embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of a certain embodiment. In addition, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

Each of the above-described configurations, functions, control unit 211, units 212 to 218, storage device 202, and the like may be realized by hardware by designing a part or all of them, for example, with an integrated circuit. Further, as shown in FIG. 5, the above-described configurations, functions, and the like may be realized by software by interpreting and executing a program that realizes each function by a processor such as the CPU 203. Information such as programs, tables, and files for realizing each function is stored in the storage device 202 as shown in FIG. 4, as well as a memory 201, a recording device such as an SSD (Solid State Drive), or an IC ( It can be stored in a recording medium such as an integrated circuit (SD) card, a secure digital (SD) card, or a digital versatile disc (DVD).
In each embodiment, control lines and information lines are those that are considered necessary for explanation, and not all control lines and information lines are necessarily shown on the product. In practice, it can be considered that almost all configurations are connected to each other.

1 Detector (Detector)
2 Control device 3 Output device (output unit)
4 Steering (operating unit, mounted on the vehicle)
5 Fingers 10, 10A to 10C Pulse wave detection system 31 Display device 32 Audio device 101 Sensor device 102 Substrate device 111, 111a, 111b Visible light emitting device (light emitting unit)
112, 112a, 112b Infrared light emitting device (light emitting unit)
113, 113a to 113c Light receiving device 115 Covering unit 211 Control unit 212 Pulse wave detection processing unit 213 Pulse determination processing unit 214 Situation determination processing unit 215 Authentication unit 216 Light quantity optimization processing unit 217 Vehicle control unit 218 Output processing unit (instruction unit)

Claims (14)

1. A detection unit that receives a plurality of types of light emitted and distinguishable from each other;
   A pulse wave detection processing unit that determines whether or not a pulse wave is detected based on information on the plurality of types of light received by the detection unit;
   Have
   The detection unit and the pulse wave detection processing unit are provided in a moving body,
   The pulse wave detection processing unit
   A pulse wave detection system characterized by determining whether or not the pulse wave is detected by comparing phases of the received plural types of light in a state where the moving body is moving.
2. The pulse wave detection system according to claim 1, wherein each of the plurality of types of light has different wavelengths.
3. The pulse wave detection system according to claim 2, wherein the plurality of types of light have different intensities.
4. The detection unit has one light emitting unit,
   The pulse wave detection system according to claim 1, wherein the plurality of types of light have different intensities but have the same wavelength.
5. The pulse wave detection processing unit
   In addition to the phase, in each of the plurality of types of light, in each light, a difference in intensity between adjacent peaks, a peak intensity ratio in the plurality of types of light, and a peak in each of the plurality of types of light in the light. 2. The pulse wave detection according to claim 1, wherein whether or not the pulse wave is detected is determined by comparing at least one of the intensity of the light and the period of the plurality of types of light. system.
6. The detector is
   2. The pulse wave detection system according to claim 1, wherein the plurality of types of light reflected by the pulse wave measurement target or transmitted through the pulse wave measurement target are received. 3.
7. The pulse wave detection system according to claim 1, wherein the detection unit is provided in an operation unit of the moving body.
8. The operation unit is
   The pulse wave detection system according to claim 7, comprising a plurality of the detection units.
9. It has an output unit that outputs information,
   The pulse wave detection processing unit,
   Among the plurality of detection units provided, when the pulse wave is detected continuously for a predetermined time from the predetermined detection unit,
   The output unit notifies the user to touch the pulse wave measurement target to a detection unit different from the detection unit that has continuously detected the pulse wave for the predetermined time,
   The pulse wave detection processing unit,
   It is determined whether the pulse wave was detected from the said another detection part. The pulse wave detection system of Claim 8 characterized by the above-mentioned.
10. The pulse wave detection system according to claim 1, wherein the pulse wave measurement target is a finger.
11. The measurement object of the pulse wave is both hands,
    2. The pulse wave detection system according to claim 1, wherein whether or not the pulse wave is detected is determined by comparing waveforms of light received by respective detection units corresponding to the both hands.
12. The pulse wave detection system according to claim 1, wherein the measurement target of the pulse wave is a palm.
13. A situation determination processing unit that determines whether or not the user is likely to be sleepy;
    When the situation determination processing unit determines that the user is likely to fall asleep, an instruction unit that instructs the detection unit to assign a measurement target via the output unit;
    The pulse wave detection system according to claim 1, further comprising:
14. Based on the frequency of the plurality of types of light, a pulse determination processing unit that determines the possibility that the user is drowsy or the possibility that the user is in a tension state;
    An output processing unit that causes the output unit to output information based on the determination result of the pulse determination processing unit;
    The pulse wave detection system according to claim 1, further comprising:

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