JPWO2020017083A1 - Detectors, programs, and detection systems - Google Patents

Abstract

The detection device according to the embodiment is capable of receiving the first light emitting unit capable of emitting the first light having the first wavelength and the reflected light of the first light emitted by the first light emitting unit, and has received the light. A light receiving portion that outputs a light receiving signal corresponding to light, a measurement surface that has at least a part of translucency and covers the first light emitting portion and the light receiving portion, and while the first light emitting portion emits light. A control unit that measures biological information based on the received light signal and determines whether or not a human body has come into contact with the measurement surface based on the biological information.

Description

The present invention relates to detection devices, programs, and detection systems.

Conventionally, a device for detecting contact with a human body using reflected light has been known. As such a device, a first light emitting means for emitting light having a first wavelength, a second light emitting means for emitting light having a second wavelength different from the first wavelength, and first and second light emitting means. A switching device including a means for determining whether or not the contacted object is a human body based on the reflected light of the wavelength of the above has been proposed. This switching device can determine whether the contacted object is a human body based on the reflectance of light of the first and second wavelengths.

International Publication No. 2010/117006

However, when the external light includes light of the first and second wavelengths, the conventional switching device may erroneously detect that the human body is in contact with the external light even though the human body is not in contact with the external light. ..

The present invention has been made in view of the above problems, and an object of the present invention is to accurately detect contact with a human body.

The detection device according to the embodiment is capable of receiving the first light emitting unit capable of emitting the first light having the first wavelength and the reflected light of the first light emitted by the first light emitting unit, and has received the light. A light receiving portion that outputs a light receiving signal corresponding to light, a measurement surface that has at least a part of translucency and covers the first light emitting portion and the light receiving portion, and while the first light emitting portion emits light. A control unit that measures biological information based on the received light signal and determines whether or not a human body has come into contact with the measurement surface based on the biological information.

According to each embodiment of the present invention, contact with the human body can be detected with high accuracy.

A functional block diagram showing an example of a biosensor. The perspective view which shows an example of the biological sensor. An enlarged view of the measurement surface of FIG. A flowchart showing an outline of processing by the control unit. The flowchart which shows an example of the detection process of the measurement target person by a control unit. A functional block diagram showing an example of a detection system.

Hereinafter, each embodiment of the present invention will be described with reference to the accompanying drawings. Regarding the description of the specification and the drawings according to each embodiment, the components having substantially the same functional configuration are designated by the same reference numerals, and the superimposed description will be omitted.

The detection device according to the embodiment will be described with reference to FIGS. 1 to 6. The detection device according to the present embodiment is a device that detects that a human body has come into contact with the measurement surface R, and can be applied to any device that controls according to the contact of the human body. Examples of such a device include a biological sensor (biological information measuring device) that measures biological information in response to contact with the human body, a switch of a lighting device that turns on or off in response to contact with the human body, and the like. In the following, a case where the detection device is a biosensor will be described as an example, but as described above, the device to which the detection device can be applied is not limited to this.

FIG. 1 is a functional block diagram showing an example of the biological sensor 1 according to the present embodiment. FIG. 2 is a perspective view showing an example of the biological sensor 1. FIG. 3 is an enlarged view of the measurement surface R, which is a portion surrounded by the dotted line in FIG.

The biological sensor 1 is a reflective biological information measuring device that measures biological information based on reflected light, and has a flat measuring surface R configured to face the surface of the human body. When the biological sensor 1 detects that the measurement target person (human body) has come into contact with the measurement surface R, the biological sensor 1 measures the biological information of the measurement target person and transmits the measured biological information to the outside by wireless communication. As shown in FIG. 2, the biosensor 1 has a width W of 40 mm, a depth D of 30 mm, and a height H of 10 mm, for example.

As shown in FIGS. 1 to 3, the biological sensor 1 includes a first light emitting unit 11, a second light emitting unit 12, a drive circuit 13, a light receiving unit 14, an amplifier circuit 15, a control unit 16, and a radio. A communication unit 17, a substrate 18, and a case 19 are provided. As shown in FIG. 3, the substrate 18 is in a state where the first light emitting unit 11, the second light emitting unit 12, the drive circuit 13, the light receiving unit 14, the amplifier circuit 15, the control unit 16, and the wireless communication unit 17 are mounted. It is housed in case 19. The broken line in FIG. 3 represents a hidden line. Further, the biosensor 1 has a power supply circuit (not shown) that realizes battery operation. Further, the biological sensor 1 may have a 3-axis gyro sensor, a 3-axis acceleration sensor, a skin temperature sensor, and the like.

The first light emitting unit 11 is a light emitting diode element or a laser element capable of emitting the first light having the first wavelength λ1. The first light is invisible light, for example, near infrared light. The first wavelength λ1 is preferably 850 nm ± 50 nm, and is, for example, 850 nm, but is not limited thereto. In the example of FIGS. 1 to 3, the biosensor 1 includes two first light emitting units 11, but may include one or three or more first light emitting units 11.

The second light emitting unit 12 is a light emitting diode element or a laser element capable of emitting second light having a second wavelength λ2 different from the first wavelength λ1. The second light is visible light, for example, red light. The second wavelength λ2 is preferably 760 nm ± 50 nm, for example, 760 nm, but is not limited thereto. In the example of FIGS. 1 to 3, the biosensor 1 includes two second light emitting units 12, but may include one or three or more second light emitting units 12.

By designing the first wavelength λ1 and the second wavelength λ2 as described above, the output of the light receiving unit 14 can be made larger and the S / N ratio can be made higher. Further, the first light emitting unit 11 and the second light emitting unit 12 may be elements independent of each other, or may be included in one package. Further, the first light emitting unit 11 and the second light emitting unit 12 may be configured by one light emitting element capable of emitting both the first light and the second light.

The drive circuit 13 is a circuit that drives the first light emitting unit 11 and the second light emitting unit 12, respectively. That is, the drive circuit 13 supplies electric power to the first light emitting unit 11 and the second light emitting unit 12, and causes the first light emitting unit 11 and the second light emitting unit 12 to emit the first light and the second light, respectively.

The light receiving unit 14 is a photodiode element or a phototransistor element that outputs a signal (light receiving signal) corresponding to the received light. The light receiving unit 14 is arranged so that the reflected light of the first light and the second light emitted by the first light emitting unit 11 and the second light emitting unit 12 can be received. The light receiving unit 14 is configured to have sensitivity to a wavelength in the vicinity of the first wavelength λ1 and a wavelength in the vicinity of the second wavelength λ2. In the example of FIGS. 1 to 3, the biosensor 1 includes one light receiving unit 14, but may include two or more light receiving units 14. Further, the biosensor 1 may include a light receiving unit 14 having sensitivity to a wavelength near the first wavelength λ1 and a light receiving unit 14 having sensitivity to a wavelength near the second wavelength λ2, respectively.

The amplifier circuit 15 is a circuit that amplifies the light receiving signal output by the light receiving unit 14. The amplifier circuit 15 is composed of, for example, an operational amplifier. The received light signal amplified by the amplifier circuit 15 is input to the control unit 16.

In the present embodiment, as shown in FIG. 2, a measurement surface R is provided on the surface of the case 19, and the measurement surface R is configured to include a reflection portion 20. The reflecting unit 20 is a portion configured to reflect the first light and the second light emitted from the first light emitting unit 11 and the second light emitting unit 12 with an object in contact with the measurement surface R. .. At least a part of the first light and the second light repeatedly reflected between the reflecting unit 20 and the object is received by the light receiving unit 14. The reflective portion 20 is formed of a metal film (gold plating) containing gold (Au) or the like provided on the surface of the measurement surface R.

As shown in FIG. 3, the light receiving unit 14 is arranged on the substrate 18 so as to be sandwiched between the first light emitting unit 11 and the second light emitting unit 12. Then, the reflecting portion 20 is formed with a window portion W1 that exposes the first light emitting portion 11 and the second light emitting portion 12, and a window portion W2 that exposes the light receiving portion 14. The window portion W1 and the window portion W2 are formed of a translucent material such as polyethylene terephthalate (PET). That is, the measurement surface R is arranged so as to cover the first light emitting unit 11, the second light emitting unit 12, and the light receiving unit 14, and exposes the first light emitting unit 11, the second light emitting unit 12, and the light receiving unit 14. It has a light window portion W1 and W2 and a reflective portion 20 formed around the window portions W1 and W2.

When no object exists in the vicinity of the measurement surface R, the first light and the second light emitted by the first light emitting unit 11 and the second light emitting unit 12 pass through the window portion W1 and diffuse to the outside. External light that has passed through the window portion W2 is incident on the light receiving portion 14.

On the other hand, when an object is in contact with the measurement surface R, a part of the first light and the second light emitted by the first light emitting unit 11 and the second light emitting unit 12 passes through the window portion W1 and the measurement surface R It is reflected by an object in contact with the light, reflected by the reflecting unit 20, repeatedly reflected between the object and the reflecting unit 20, then passes through the window unit W2 and is incident on the light receiving unit 14. When there is a gap between the measurement surface R and the object, the external light that has passed through the gap and the window portion W2 is incident on the light receiving portion 14.

The control unit 16 controls the light emission of the first light emitting unit 11 and the second light emitting unit 12 by controlling the drive circuit 13, and measures the measurement surface R based on the light receiving signal output by the light receiving unit 14. It is a circuit that detects the contact of the target person and measures the biological information of the contacted measurement target person. The control unit 16 is, for example, a microcomputer including a CPU, a ROM, and a RAM. The function of the control unit 16 is realized by the CPU executing the program stored in the ROM on the RAM. The program executed by the CPU can be recorded on any computer-readable recording medium such as a CD (Compact Disk), a DVD, or a flash memory.

Specifically, the control unit 16 transmits a timing signal to the drive circuit 13 and causes the first light emitting unit 11 and the second light emitting unit 12 to emit the first light and the second light, respectively. Further, the control unit 16 uses, for example, a built-in analog-digital conversion circuit to convert the amplified received light signal (analog signal) output from the amplifier circuit 15 into a digital signal, and based on the converted received light signal. Then, the measurement target person is detected and the biological information of the measurement target person is measured. The processing of the control unit 16 will be described later.

The wireless communication unit 17 is a circuit that controls wireless communication between the biosensor 1 and the outside. The wireless communication unit 17 is, for example, a wireless communication IC (Integrated Circuit), but is not limited to this. The wireless communication unit 17 transmits the biological information measured by the control unit 16 to the outside by communication using a wireless communication standard such as Bluetooth (registered trademark). The biosensor 1 may transmit signal information used for measuring biometric information to the outside by wireless communication instead of biometric information. In this case, the external device can measure the biological information based on the signal information.

The substrate 18 is configured to hold the first light emitting unit 11, the second light emitting unit 12, the drive circuit 13, the light receiving unit 14, the amplifier circuit 15, the control unit 16, and the wireless communication unit 17. The substrate 18 is, for example, a printed circuit board in which a wiring pattern is formed of a copper foil on a glass epoxy substrate, but the substrate 18 is not limited to this. As shown in FIG. 3, the first light emitting unit 11 and the second light emitting unit 12 are arranged so as to line up on the virtual line L1 on the surface of the substrate 18. Further, the light receiving unit 14 is arranged on the virtual line L2 perpendicular to the virtual line L1. In the example of FIG. 3, the two first light emitting units 11 are symmetrically arranged with the virtual line L2 in between. Further, the two second light emitting units 12 are arranged symmetrically with the virtual line L2 in between. The distance D1 between the first light emitting unit 11 and the virtual line L2 and the distance D2 between the second light emitting unit 12 and the virtual line L2 are, for example, in the range of 4 to 11 mm. In this way, by arranging the first light emitting unit 11 and the second light emitting unit 12 symmetrically with the virtual line L2 (light receiving unit 14) interposed therebetween, the first light and the second light incident on the light receiving unit 14 are made uniform. Can be converted. The intervals D1 and D2 can be arbitrarily designed. For example, in the example of FIG. 3, the interval D1 is larger than the interval D2, but the interval D1 may be smaller than the interval D2. Further, the interval D1 may be different for each of the first light emitting units 11. Similarly, the interval D2 may be different for each second light emitting unit 12.

In the present embodiment, the first light emitting unit 11, the second light emitting unit 12, and the light receiving unit 14 are mounted on the lower surface of the substrate 18 (the surface on the measurement surface R side). The drive circuit 13, the amplifier circuit 15, the control unit 16, and the wireless communication unit 17 are mounted on the upper surface of the substrate 18. However, at least one of the drive circuit 13, the amplifier circuit 15, the control unit 16, and the wireless communication unit 17 may be mounted on the lower surface of the substrate 18. The same applies to the power supply circuit.

Next, the processing by the control unit 16 will be described. FIG. 4 is a flowchart showing an outline of processing by the control unit 16. The control unit 16 executes the process of FIG. 4 at predetermined time intervals.

First, the control unit 16 transmits a timing signal to the drive circuit 13 to light the first light emitting unit 11 (step S101). As a result, the first light emitting unit 11 emits the first light. Since the first light is invisible light, even if the first light emitting unit 11 is turned on, the first light cannot be seen from the outside.

Next, the control unit 16 detects the contact of the measurement target person with the measurement surface R based on the waveform of the received light signal input from the amplifier circuit 15 (step S102). The method of detecting the person to be measured will be described later.

When the control unit 16 does not detect the contact of the measurement target person with the measurement surface R (step S102: NO), the control unit 16 ends the process. On the other hand, when the control unit 16 detects the contact of the measurement target person with the measurement surface R (step S102: YES), the control unit 16 lights the second light emitting unit 12 (step S102). Although the second light is visible light, the second light cannot be seen from the outside because the measurement target person is in contact with the measurement surface R covering the second light emitting unit 12.

When the second light emitting unit 12 is turned on, the control unit 16 measures the biological information of the measurement target person based on the received light signal input from the amplifier circuit 15 (step S104). When the measurement target person is in contact with the light receiving unit 14, the second light repeatedly reflected between the measurement target person and the reflection unit 20 is incident on the light receiving unit 14, so that the light receiving signal is irradiated to the measurement target person. A signal corresponding to the second light is included. Therefore, the control unit 16 can measure the biological information of the measurement target person by any existing measurement method using visible light based on the frequency, amplitude, waveform, and the like of the received signal. Specifically, the control unit 16 can measure the blood hemoglobin concentration, the blood oxygen concentration, the pulse rate, the pulse interval, the blood pressure, the skin temperature, and the like of the measurement target person.

The control unit 16 may turn off the first light emitting unit 11 or leave the first light emitting unit 11 on when measuring biological information. In the latter case, since the first light and the second light that are repeatedly reflected between the measurement target person and the reflection unit 20 are incident on the light receiving unit 14, the light receiving signal is the first light that is applied to the measurement target person. Signals corresponding to light and second light are included. Therefore, the control unit 16 can measure the biological information of the measurement target person by any existing measurement method using visible light and invisible light based on the frequency, amplitude, waveform, and the like of the received signal.

After that, the control unit 16 turns off the second light emitting unit 12 (step S105), and ends the process. By the above processing, the control unit 16 can detect the measurement target person by the first light at predetermined time intervals, and when the measurement target person is detected, can execute the measurement of the biological information by the second light. it can.

FIG. 5 is a flowchart showing an example of the detection process of the measurement target person by the control unit 16. The detection process of FIG. 5 corresponds to the internal process of step S102 of FIG.

When the detection process of the measurement target person is started, the control unit 16 first measures the AC amplitude of the received light signal (step S201). The AC amplitude may be the maximum value, the average value, or the effective value of the amplitude of the AC component included in the received signal.

When the measurement target person is not in contact with the measurement surface R, the first light emitted by the first light emitting unit 11 is not reflected by the measurement target person, so that the light is hardly incident on the light receiving unit 14. That is, most of the light incident on the light receiving unit 14 is external light. In general, external light has a small AC component. Therefore, when the measurement target person is not in contact with the measurement surface R, it is considered that the AC amplitude of the received light signal becomes small.

On the other hand, when the measurement target person is in contact with the measurement surface R, the first light emitted by the first light emitting unit 11 is reflected by the measurement target person and incident on the light receiving unit 14. Further, the external light is blocked by the person to be measured and hardly enters the light receiving unit 14. Then, the first light reflected by the measurement target has a large AC component due to the pulse of the measurement target. Therefore, when the measurement target person is in contact with the measurement surface R, it is considered that the AC amplitude of the received light signal becomes large.

Therefore, when the AC amplitude of the received signal is less than the preset threshold value Ath (step S202: NO), the control unit 16 determines that the measurement target person is not in contact with the measurement surface R (step S210). , Ends the detection process. Since the determination in step S210 corresponds to not detecting the contact of the measurement target person with the measurement surface R, the process of FIG. 4 is also completed after the detection process is completed. The threshold value Ath is set by an experiment and stored in the ROM of the control unit 16.

On the other hand, when the AC amplitude of the received light signal is equal to or higher than the preset threshold value Ath (step S202: YES), the control unit 16 determines that the measurement target person may be in contact with the measurement surface R. ..

Next, the control unit 16 executes the first determination process based on the biological information. Specifically, the control unit 16 measures the pulse interval based on the received signal, assuming that the received signal is a signal corresponding to the pulse wave of the measurement target person (step S203). The pulse interval is the peak (R wave) interval of the pulse wave. The human pulse interval is generally 300 ms or more and 2150 ms or less. The control unit 16 can measure the pulse interval by any existing method using the received signal.

When the measurement target person is not in contact with the measurement surface R, the first light emitted by the first light emitting unit 11 is not reflected by the measurement target person, so that the light is hardly incident on the light receiving unit 14. That is, most of the light incident on the light receiving unit 14 is external light. Therefore, when the measurement target person is not in contact with the measurement surface R, even if the pulse interval is measured based on the received signal, the pulse interval is considered to be a value far from the human pulse interval or cannot be measured. Be done.

On the other hand, when the measurement target person is in contact with the measurement surface R, the first light emitted by the first light emitting unit 11 is reflected by the measurement target person and incident on the light receiving unit 14. Further, the external light is blocked by the person to be measured and hardly enters the light receiving unit 14. Then, the waveform of the first light reflected by the measurement target person becomes a waveform corresponding to the pulse wave of the measurement target person. Therefore, when the measurement target person is in contact with the measurement surface R, when the pulse interval is measured based on the received signal, it is considered that the pulse interval is a value that matches the human pulse interval.

Therefore, when the pulse interval measured based on the received signal is outside the predetermined first range (step S204: NO), the control unit 16 determines that the measurement target person is not in contact with the measurement surface R (step). S210), the detection process is terminated. When the pulse interval is out of the first range, the case where the pulse interval cannot be measured is also included. Since the determination in step S210 corresponds to not detecting the contact of the measurement target person with the measurement surface R, the process of FIG. 4 is also completed after the detection process is completed. The first range is, for example, a range of 300 ms or more and 2150 ms or less, but is not limited to this. The first range is stored in the ROM of the control unit 16.

On the other hand, when the pulse interval measured based on the received signal is within the preset first range (step S204: YES), the control unit 16 may contact the measurement target person with the measurement surface R. Judged as having sex.

Next, the control unit 16 executes a second determination process based on the biological information. Specifically, the control unit 16 measures the blood pressure based on the received light signal, assuming that the received light signal is a signal corresponding to the pulse wave of the measurement target person (step S205). The control unit 16 can measure the blood pressure by any existing method using the received signal. Human blood pressure is generally 40 mmHg or more and 255 mmHg or less.

When the measurement target person is not in contact with the measurement surface R, the first light emitted by the first light emitting unit 11 is not reflected by the measurement target person, so that the light is hardly incident on the light receiving unit 14. That is, most of the light incident on the light receiving unit 14 is external light. Therefore, when the measurement target person is not in contact with the measurement surface R, even if the blood pressure is measured based on the received signal, the blood pressure is far from the human blood pressure, or the external light is a human-specific pulse. It is considered that blood pressure cannot be measured because the wave and waveform are different.

On the other hand, when the measurement target person is in contact with the measurement surface R, the first light emitted by the first light emitting unit 11 is reflected by the measurement target person and incident on the light receiving unit 14. Further, the external light is blocked by the person to be measured and hardly enters the light receiving unit 14. Then, the waveform of the first light reflected by the measurement target person becomes a waveform corresponding to the pulse wave of the measurement target person. Therefore, when the measurement target person is in contact with the measurement surface R, when the blood pressure is measured based on the received signal, the blood pressure is considered to be a value consistent with the human blood pressure.

Therefore, when the blood pressure measured based on the received signal is out of the predetermined second range (step S206: NO), the control unit 16 determines that the measurement target person is not in contact with the measurement surface R (step S210). ), End the detection process. When the blood pressure is outside the second range, the case where the blood pressure cannot be measured is included. Since the determination in step S210 corresponds to not detecting the contact of the measurement target person with the measurement surface R, the process of FIG. 4 is also completed after the detection process is completed. The first range is, for example, a range of 40 mmHg or more and 255 mmHg or less, but is not limited to this. The second range is stored in the ROM of the control unit 16.

On the other hand, when the blood pressure measured based on the received signal is within the preset second range (step S206: YES), the control unit 16 may have a measurement target person in contact with the measurement surface R. It is determined that there is.

Next, the control unit 16 executes a third determination process based on the biological information. Specifically, the control unit 16 measures the blood vessel age based on the received signal, assuming that the received signal is a signal corresponding to the pulse wave of the measurement target person (step S207). The control unit 16 can measure the blood vessel age by any existing method using the received signal. The age of human blood vessels is generally 0 to 100 years.

When the measurement target person is not in contact with the measurement surface R, the first light emitted by the first light emitting unit 11 is not reflected by the measurement target person, so that the light is hardly incident on the light receiving unit 14. That is, most of the light incident on the light receiving unit 14 is external light. Therefore, when the measurement target person is not in contact with the measurement surface R, even if the blood vessel age is measured based on the received signal, the blood vessel age is far from the human blood vessel age, or the outside light is human. It is considered that the blood vessel age cannot be measured because the waveform is different from the inherent pulse wave.

On the other hand, when the measurement target person is in contact with the measurement surface R, the first light emitted by the first light emitting unit 11 is reflected by the measurement target person and incident on the light receiving unit 14. Further, the external light is blocked by the person to be measured and hardly enters the light receiving unit 14. Then, the waveform of the first light reflected by the measurement target person becomes a waveform corresponding to the pulse wave of the measurement target person. Therefore, when the measurement target person is in contact with the measurement surface R, when the blood vessel age is measured based on the received signal, the blood vessel age is considered to be a value consistent with the human blood vessel age.

Therefore, when the blood vessel age measured based on the received signal is outside the predetermined third range (step S208: NO), the control unit 16 determines that the measurement target person is not in contact with the measurement surface R (step). S210), the detection process is terminated. When the blood vessel age is outside the predetermined third range, the case where the blood vessel age cannot be measured is also included. Since the determination in step S210 corresponds to not detecting the contact of the measurement target person with the measurement surface R, the process of FIG. 4 is also completed after the detection process is completed. The third range is, for example, a range of 0 to 100 years old, but is not limited to this. The third range is stored in the ROM of the control unit 16.

On the other hand, when the blood vessel age measured based on the received signal is within the preset third range (step S208: YES), the control unit 16 determines that the measurement target person is in contact with the measurement surface R. Determine (step S209). Since the determination in step S209 corresponds to detecting the contact of the measurement target person with the measurement surface R, the control unit 16 executes the process of step S103 in FIG. 4 after the detection process is completed.

By the above processing, the control unit 16 can execute the detection of the measurement target person by the first light. In the example of FIG. 5, the control unit 16 executed the determination process in the order of the AC amplitude determination process, the first determination process, the second determination process, and the third determination process. The order of execution can be designed arbitrarily. Further, the control unit 16 may execute only one of the first determination process, the second determination process, and the third determination process, or may execute only two of them. May be good. In this case, if the biometric information is out of the predetermined range in any one of the determination processes to be executed, the control unit 16 determines that the human body is not in contact, and in all the determination processes to be executed, the biometric information. If is within a predetermined range, it may be determined that the human body is in contact. Further, the control unit 16 can omit the determination process based on the AC amplitude. In either case, the control unit 16 can detect the person to be measured based on the biological information measured based on the received light signal.

As described above, according to the present embodiment, the control unit 16 measures the biological information based on the received light signal while the first light emitting unit 11 emits the first light, and based on the biological information. , It is determined whether the human body is in contact with the measurement surface R. Since biological information such as pulse interval, blood pressure, and blood vessel age is human-specific information, the control unit 16 can accurately detect the contact of the human body with the measurement surface R by using the biological information. it can. Specifically, when an object other than the human body comes into contact with the measurement surface R, or due to the influence of external light, the human body is in contact with the measurement surface R even though the human body is not in contact with the measurement surface R. It is possible to suppress an erroneous determination that is determined to be.

Further, by accurately detecting the contact with the human body, when the human body is surely in contact with the measurement surface R, that is, when the external light hardly enters the light receiving portion 14, the biological information by the second light is obtained. Since the measurement is performed, the biological information can be measured accurately.

Further, according to the present embodiment, the detection process of the human body is performed by the first light which is invisible light, and the second light which is visible light is not emitted during the detection process. Therefore, it is possible to suppress the glare given to the human beings around the biosensor 1 by the second light. In addition, the power required for the detection process of the human body can be suppressed.

In the present embodiment, the method for detecting the human body is not limited to the above example. For example, the control unit 16 detects the human body by machine learning the waveform of the pulse wave and determining whether the waveform of the received signal is the waveform of the pulse wave based on the waveform model obtained by the machine learning. May be good. As a machine learning method, any existing method such as a support vector machine can be used.

Further, in the above, the control unit 16 of the biosensor 1 detects the human body and measures the biometric information, but the detection of the human body and the measurement of the biometric information may be performed by a device outside the biosensor 1.

Here, FIG. 6 is a functional block diagram showing an example of the detection system 100 according to the present embodiment. The detection system 100 of FIG. 6 includes a biosensor 1 and an information processing device 2 capable of wireless communication. The configuration of the biosensor 1 is as described above. However, in the example of FIG. 6, the control unit 16 does not detect the human body or measure biological information. Further, the wireless communication unit 17 wirelessly transmits the received signal to the information processing device 2.

The information processing device 2 is an arbitrary computer capable of communicating with the biosensor 1. The information processing device 2 is, for example, a microcomputer, a server, a PC (Personal Computer), a smartphone, or a tablet terminal, but is not limited thereto. In the example of FIG. 6, the information processing device 2 can communicate wirelessly with the biosensor 1, but may also communicate wirelessly. Further, the biosensor 1 and the information processing device 2 may be communicably connected via a network such as the Internet. The information processing device 2 executes detection of the human body and measurement of biological information based on the received light signal received from the biological sensor 1. The method for detecting the human body and the method for measuring biological information are as described above.

The above-mentioned effect can be obtained by the information processing device 2 measuring the biological information based on the received light signal and detecting the contact with the human body based on the biological information. Further, with the configuration of FIG. 6, the amount of calculation of the biological sensor 1 can be suppressed.

The preferred embodiment of the present invention has been described in detail above. However, the present invention is not limited to the embodiments described above. Various modifications and substitutions can be applied to the embodiments described above without departing from the scope of the present invention. In addition, each of the features described with reference to the above-described embodiments may be appropriately combined as long as there is no technical contradiction.

In addition, this international application claims priority based on Japanese Patent Application No. 2018-134399 filed on July 17, 2018, and the entire contents of the application are incorporated into this international application.

1: Biological sensor 2: Information processing device 11: First light emitting unit 12: Second light emitting unit 13: Drive circuit 14: Light receiving unit 15: Amplifier circuit 16: Control unit 17: Wireless communication unit 18: Board 19: Case 20: Reflector 100: Detection system R: Measurement surface W1, W2: Window L1, L2: Virtual line D1, D2: Interval

Claims (10)

A first light emitting unit capable of emitting first light having a first wavelength, and
A light receiving unit capable of receiving the reflected light of the first light emitted by the first light emitting unit and outputting a light receiving signal corresponding to the received light, and a light receiving unit.
A measurement surface having at least a part of translucency and covering the first light emitting portion and the light receiving portion,
While the first light emitting unit is emitting light, a control unit that measures biological information based on the received light signal and determines whether or not a human body has come into contact with the measurement surface based on the biological information.
A detection device comprising. The detection device according to claim 1, wherein the control unit determines that the human body is not in contact with the measurement surface when the biological information is out of a predetermined range. The detection device according to claim 2, wherein the biological information includes at least one of pulse interval, blood pressure, and blood vessel age. The detection device according to any one of claims 1 to 3, wherein the first light is invisible light. The control unit measures the AC amplitude of the light received by the light receiving unit while the first light emitting unit is emitting light, and when the AC amplitude is less than the threshold value, the human body comes into contact with the measurement surface. The detection device according to any one of claims 1 to 4, wherein the detection device is determined not to be present. A second light emitting unit capable of emitting a second light having a second wavelength different from the first wavelength is further provided.
The light receiving unit can receive the reflected light of the second light emitted by the second light emitting unit.
The detection device according to any one of claims 1 to 5, wherein the measurement surface covers the second light emitting unit. The detection device according to claim 6, wherein when the control unit determines that the human body has come into contact with the measurement surface, the second light emitting unit emits light and measures biological information based on the received signal. The detection device according to claim 6 or 7, wherein the second light is visible light. A first light emitting unit capable of emitting first light having a first wavelength, and
A light receiving unit capable of receiving the reflected light of the first light emitted by the first light emitting unit and outputting a light receiving signal corresponding to the received light, and a light receiving unit.
A measurement surface having translucency and covering the first light emitting portion and the light receiving portion,
Control unit and
In the control unit of the detection device provided with
A program for measuring biological information based on the received signal while the first light emitting unit is emitting light, and executing a step of determining whether or not a human body has come into contact with the measurement surface based on the biological information. .. A biometric detection system equipped with sensors and information processing devices connected via a network.
The sensor is
A first light emitting unit capable of emitting first light having a first wavelength, and
A light receiving unit capable of receiving the reflected light of the first light emitted by the first light emitting unit and outputting a light receiving signal corresponding to the received light, and a light receiving unit.
A measurement surface having translucency and covering the first light emitting portion and the light receiving portion,
A communication unit that transmits the received signal to the information processing device, and
With
The information processing device is a detection system that determines whether or not a human body has come into contact with the measurement surface based on the received light signal received from the sensor while the first light emitting unit is emitting light.

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