JP2020192187A - Non-contact sphygmomanometer - Google Patents

Abstract

To provide a sphygmomanometer that has a low price and high performance.SOLUTION: A non-contact sphygmomanometer 1 measures in a non-contact state blood pressure of an examinee in a prescribed heartbeat measurement time, including: an image sensor part 10 which receives reflect light reflected by the examinee in a heartbeat measurement time and which outputs RAW data with a prescribed time interval corresponding to the frame rate number of the image sensor part 10; and a reflection heartbeat timing calculation part 20 which outputs as reflection heartbeat timing the examinee's heartbeat timing calculated on the basis of the time change of the G component of the RAW data.SELECTED DRAWING: Figure 1

Description

The present invention relates to a non-contact blood pressure measuring device that non-contactly measures the blood pressure of a subject to be detected within a predetermined heart rate measurement time.

Blood pressure is an indispensable barometer for health, and frequent measurement of blood pressure is recommended. As a device for measuring blood pressure, a contact blood pressure measuring device (a blood pressure measuring device using an arm band (cuff)) that measures blood pressure in contact with a subject is a band-shaped arm band on the arm for measuring blood pressure. Since it is a necessary condition for measurement, it has not been possible to measure changes in blood pressure during daily activities such as bathing or exercising. Therefore, there is a demand for a non-contact blood pressure measuring device (a blood pressure measuring device that does not use an arm band (cuff)) that measures blood pressure without contacting the person to be detected.

In Patent Document 1, the time change of the brightness in the skin image is calculated by using the image acquisition unit that acquires the skin image in which the skin of the person to be detected is captured and the skin image, and the brightness is changed with the time change of the brightness. A non-contact blood pressure measuring device is disclosed, which is indispensable to include a pulse wave timing calculation unit that calculates time information indicating a peak time as a pulse wave timing.

Further, the non-contact blood pressure device described in Patent Document 1 uses a radio wave acquisition unit that acquires a signal of a reflected radio wave reflected by the detected person and a signal of the reflected radio wave acquired by the radio wave acquisition unit to be used with the person to be detected. The time difference between the pulse wave timing and the heartbeat timing is used in the heartbeat timing calculation unit that calculates the time change of the distance to the receiving antenna and calculates the time information indicating the time when the distance peaks in the time change of the distance as the heartbeat timing. Based on this, it is provided with a blood pressure calculation unit that determines the blood pressure of the person to be detected. The blood pressure determined by the blood pressure calculation unit is displayed in the presentation unit.

Since the image acquisition unit used in the non-contact blood pressure device described in Patent Document 1 is intended as a general digital camera, it is a lens that collects the reflected light reflected by the person to be detected and creates a clear light image. It is provided with an image sensor unit that generates RAW data that records light image detection information as it is, and an image processing engine that processes RAW data into an image that can be observed by humans.

JP-A-2016-77890

In the technique described in Patent Document 1, the pulse wave timing calculation unit is indispensable to calculate the heartbeat timing based on the time change of the brightness of the skin image. Therefore, the image processing engine generates an RGB image from the RAW data in which the light image is recorded as it is, and then adjusts the brightness and white balance so that the pulse wave timing calculation unit can obtain the brightness information from the skin image. Image processing such as adjustment, sharpness adjustment, contrast adjustment, and noise processing is performed, and a skin image is output.

In general, if many arithmetic processes required for blood pressure measurement can be performed in a short time, the accuracy of blood pressure measurement is improved. Further, since the image processing engine performs image processing, it is difficult for the image acquisition unit to increase the frame rate.

Therefore, the technique described in Patent Document 1 has a problem that it has an arithmetic processing cost and a component cost for performing image processing.
An object of the present invention is to provide an inexpensive and high-performance non-contact blood pressure measuring device.

The non-contact blood pressure measuring device according to the present invention is a device that non-contactly measures the blood pressure of a person to be detected within a predetermined heart rate measurement time. The non-contact blood pressure measuring device is an image sensor unit that receives the reflected light reflected by the person to be detected within the heart rate measurement time, and RAW data at predetermined time intervals according to the number of frame rates of the image sensor unit. The image sensor unit that outputs the above, the light-receiving side heartbeat timing calculation unit that outputs the heartbeat timing of the detected person calculated based on the time change of the G component of the RAW data as the received heartbeat timing, and the heartbeat measurement time. The radio wave receiving unit that receives the reflected radio wave reflected by the radio wave and outputs it as a radio wave signal, and the radio wave side heartbeat that outputs the heartbeat timing of the detected person calculated based on the time change of the radio wave signal as the radio wave heartbeat timing. It includes a timing calculation unit and a blood pressure calculation unit that calculates the blood pressure of the person to be detected based on the received heartbeat timing and the radio wave heartbeat timing.

Another non-contact blood pressure measuring device according to the present invention is a device that non-contactly measures the blood pressure of a person to be detected within a predetermined heart rate measurement time. The non-contact blood pressure measuring device includes a plurality of image sensor units, a plurality of light receiving side heartbeat timing calculation units, and a blood pressure calculation unit. Each image sensor unit receives each of the plurality of reflected light reflected by the person to be detected within the heart rate measurement time, and each image sensor unit receives a plurality of reflected light at each predetermined time interval according to the number of frame rates of each image sensor unit. Output each of the RAW data. Each light receiving side heartbeat timing calculation unit outputs each of the plurality of heartbeat timings of the detected person calculated based on the time change of the G component of each RAW data as each of the plurality of light receiving heartbeat timings. The blood pressure calculation unit calculates the blood pressure of the person to be detected based on the plurality of received heartbeat timings.

Another non-contact blood pressure measuring device according to the present invention is a device that non-contactly measures the blood pressure of a person to be detected within a predetermined heart rate measurement time. The non-contact blood pressure measuring device includes an image sensor unit, a plurality of light receiving side heartbeat timing calculation units, and a blood pressure calculation unit. The image sensor unit is an image sensor unit that receives the reflected light reflected by the person to be detected within the heart rate measurement time, and the frame rate of the image sensor unit when receiving light within the light receiving range of the image sensor unit. A plurality of RAW data are output for each of a plurality of specific light receiving ranges narrower than the light receiving range of the image sensor unit and at different positions from each other at a time interval shorter than a predetermined time interval corresponding to the number. Each light-receiving side heartbeat timing calculation unit calculates each of the plurality of heartbeat timings as each of the plurality of light-receiving side heartbeat timings based on the time change of the G component of each RAW data. The blood pressure calculation unit calculates the blood pressure of the person to be detected based on the plurality of light-receiving side heartbeat timings.

According to the present invention, since the heartbeat can be calculated from the RAW data acquired by the image sensor unit without calculating the brightness, it is possible to provide an inexpensive and high-performance non-contact blood pressure measuring device.

In particular, since the processing cost per frame of the RAW data output based on the charge output by the image sensor that detects the light image in the image sensor unit is low, the number of frame rates of the RAW data output by the image sensor unit is increased. can do.

It is a block diagram which shows the structure of the non-contact blood pressure measuring apparatus of 1st Embodiment which concerns on this invention. It is sectional drawing which omitted a part explaining the image sensor part of the non-contact blood pressure measuring apparatus shown in FIG. It is a schematic diagram explaining the primary color filter of the image sensor part shown in FIG. It is a schematic diagram explaining the image pickup element of the image sensor part shown in FIG. It is a flowchart explaining the operation of the non-contact blood pressure measuring apparatus shown in FIG. It is a heart rate chart measured by the non-contact blood pressure measuring device shown in FIG. It is a block diagram which shows the structure of the non-contact blood pressure measuring apparatus of 2nd Embodiment which concerns on this invention. It is a flowchart explaining the operation of the non-contact blood pressure measuring apparatus shown in FIG. 7. It is a block diagram which shows the structure of the non-contact blood pressure measuring apparatus of 3rd Embodiment which concerns on this invention. It is a schematic diagram explaining the range of the RAW data acquired by the image sensor part of the non-contact blood pressure measuring apparatus shown in FIG. It is a flowchart explaining the operation of the non-contact blood pressure measuring apparatus shown in FIG. It is a schematic perspective view of the measuring apparatus provided with the non-contact blood pressure measuring apparatus which concerns on this invention.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.

(Non-contact blood pressure measuring device 1)
The non-contact blood pressure measuring device 1 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 6.

As shown in FIG. 1, the non-contact blood pressure measuring device 1 calculates the heartbeat timing on the light receiving side and the image sensor unit 10 so that the blood pressure of the detected person can be measured in a non-contact manner within a predetermined heartbeat measurement time. A unit 20, a radio wave receiving unit 30, a radio wave side heartbeat timing calculation unit 40, and a blood pressure calculation unit 50 are provided. As a result, the non-contact blood pressure measuring device 1 can form a blood pressure measuring device that does not use an arm band (cuff).

As shown in FIG. 6, general electrocardiogram waveforms are P wave (atrial excitation (contraction) (depolarization)), QRS complex (ventricular excitement (contraction) (depolarization)), and T wave (ventricular recovery). (Expansion) (repolarization)), P wave, QRS wave, and T wave are repeated. One heartbeat time is the time HR between RR. The heart rate measurement time of the present invention is set to be longer than the general heart rate time, and is preferably exceeding HR and not more than twice HR, for example, a time in the range of 3 seconds or more and 5 seconds or less. Is preferable.

As shown in FIG. 1, the non-contact blood pressure measuring device 1 further collects the display unit 60, the light source unit (not shown) that emits light toward the detected person, and the reflected light reflected by the detected person. It is provided with a lens (not shown) and a radio wave source unit (not shown) that emits radio waves toward the person to be detected. However, the non-contact blood pressure measuring device 1 does not include an image processing engine that performs image processing of RAW data and converts it into a skin image that can be observed by humans, as described in Patent Document 1.

That is, the light emitted by the light source unit is reflected by the person to be detected (reflected light), passes through the lens (optical image), and is received by the image sensor unit 10.

(Image sensor unit 10)
As shown in FIG. 2, the image sensor unit 10 receives the light image within the heart rate measurement time, and outputs the RAW data of a predetermined number of pixels at a predetermined timing, so that the lens layer 11 and the color filter can be output. A layer 12 and an image pickup device 13 are provided. The predetermined number of pixels corresponds to the resolution of the light image received by the image sensor unit 10. The predetermined timing is usually a time interval corresponding to the number of frame rates of the image sensor unit 10, and for example, the frame rate is 125 fps. The image sensor unit 10 is arranged in the order of the lens layer 11, the color filter layer 12, and the image sensor 13.

(Lens layer 11)
The lens layer 11 is composed of a plurality of microlenses 11a arranged in an array shape. Each microlens 11a is a convex lens with one convex and the other flat. A plurality of microlenses 11a are arranged so that the lens side of the lens layer 11 is in a convex state. The number of microlenses 11a is the same as the predetermined number of pixels. Each of the plurality of microlenses 11a corresponds to a plurality of pixels.

(Color filter layer 12)
As shown in FIGS. 2 and 3, the color filter layer 12 has a function of decomposing the color of light into RGB components, and includes a plurality of R color color filters 12c, a plurality of G color color filters 12a, and the like. It is composed of a plurality of B color filters 12b. The plurality of color filters 12c pass only the light of the R color component. The plurality of color filters 12a pass only the light of the G color component. The plurality of color filters 12b pass only the light of the B color component.

As shown in FIG. 3, the plurality of R color color filters 12c, the plurality of G color color filters 12a, and the plurality of B color color filters 12b are arranged in a grid pattern. For example, the G color filter 12a is adjacent to the two R color filters 12c and the two B color filters 12b.

As shown in FIG. 2, the color filter layer 12 is arranged on the lens layer 11 so that the plurality of color filters 12a, 12b and 12c correspond to the plurality of microlenses 11a, respectively.

(Image sensor 13)
As shown in FIGS. 2 and 4, the image pickup device 13 is composed of a plurality of R color photodiodes 13c, a plurality of G color photodiodes 13a, and a plurality of B color photodiodes 13b. ..

Further, the plurality of R color photodiodes 13c, the plurality of G color photodiodes 13a, and the plurality of B color photodiodes 13b are each a plurality of R color color filters 12c and a plurality of G color color filters. They are arranged in a grid pattern so as to correspond to 12a and a plurality of B color filters 12b.

When light hits the plurality of photodiodes 13a, 13b, 13c, the plurality of photodiodes 13a, 13b, 13c perform photoelectric conversion that generates an electric charge according to the intensity of the light, but detects a difference in the color of the light. You can't.

As shown in FIG. 4, the generated electric charge is output as a voltage signal S1 as RAW data of a predetermined number of pixels via the vertical transmission line 14a, the horizontal transmission line 14b, and the amplifier 15.

In this way, the RAW data is obtained by converting the charges output by the photodiodes 13a, 13b, and 13c into digital data.

Here, since the plurality of photodiodes 13a, 13b, 13c correspond to the plurality of microlenses 11a, the number of the plurality of photodiodes 13a, 13b, 13c is the same as the number of pixels. That is, since the number of image pickup devices corresponding to one pixel is one, each pixel has only one of the values of the R component, the G component, and the B component.

The RAW data used in the present invention has information on the amount of color of the color of any one of the R component, the G component, and the B component for one pixel, but a general image has one. There is a difference that the pixel has information on the amount of light of all the colors of the R component, the G component, and the B component. Therefore, in the prior art and the technique described in Patent Document 1, it is necessary to provide an image processing engine that calculates the values of the R component, the G component, and the B component of each pixel based on the RAW data.

(Light receiving side heartbeat timing calculation unit 20)
As shown in FIG. 1, the light receiving side heartbeat timing calculation unit 20 outputs the heartbeat timing of the detected person calculated based on the time change of the G component of the RAW data as the light receiving heartbeat timing.

Generally, when the heart contracts, blood is pumped from the heart, and the pumped blood reaches the face, hands, and the like. The G component of the RAW data of the face or hand in the optical image changes depending on the amount of components in the blood such as hemoglobin.

It is preferable that the light receiving side heartbeat timing calculation unit 20 further outputs the light receiving side heartbeat timing based on the time change of at least one of the R component and the B component of the RAW data. Of the RAW data, the G component and B component with good purity are mainly used. Specifically, the light receiving side heartbeat timing calculation unit 20 subtracts the noise calculated from the B component from the value calculated from the G component of the RAW data output from the image sensor unit 10 at predetermined intervals (G). Component-B component), the pulse wave as shown in FIG. 6 is calculated, the heartbeat time HR is calculated from the pulse wave, and the heartbeat timing of the detected person is calculated from the heartbeat time HR.
The G component of the RAW data corresponds to the data output from the G-color photodiode 13a, and the B component of the RAW data corresponds to the data output from the B-color photodiode 13b.
The light receiving side heartbeat timing calculation unit 20 calculates two adjacent light receiving side heartbeat peak times that are the pulsation peaks of the heartbeat of the detected person based on the time change of the G component of the RAW data, and the two light receiving side heartbeat peaks. The time between the times is calculated as the heartbeat timing on the light receiving side.

In this way, the image sensor unit 10 images the face and hands of the person to be detected, outputs RAW data, and the heartbeat timing calculation unit 20 on the light receiving side detects the heartbeat based on the time change of the G component of the RAW data. Then, the heartbeat timing of the detected person is output as the received heartbeat timing.

(Radio wave receiver 30)
The radio wave receiving unit 30 reflects the radio waves emitted from the radio wave source by the detected person (for example, the chest) and receives the reflected reflected radio waves, so that the detected person's heart contracts based on the received signal. Detects the resulting beat. The radio waves emitted from the radio source are millimeter waves or microwaves.

Specifically, the radio wave receiving unit 30 detects the distance between the radio wave receiving unit 30 and the person to be detected from the time difference between the time when the radio wave is emitted from the radio wave source and the time when the reflected radio wave is received, and the radio wave is transmitted. Output as a signal. That is, the radio wave receiving unit 30 can detect a change in distance due to the beating of the heart of the person to be detected.

(Radio wave side heartbeat timing calculation unit 40)
The radio wave side heartbeat timing calculation unit 40 outputs the heartbeat timing of the detected person calculated based on the time change of the radio wave signal as the radio wave heartbeat timing.

(Blood pressure calculation unit 50)
The blood pressure calculation unit 50 calculates the blood pressure of the person to be detected based on the time difference (pulse wave propagation time) between the received heartbeat timing and the radio wave heartbeat timing.

In general, blood pressure is calculated by multiplying cardiac output x heart rate x peripheral vascular resistance. The cardiac output is determined by the Doppler sensor. The heart rate is determined by a camera or a Doppler sensor. Peripheral vascular resistance is determined with a camera or LED. Cardiac output indicates the amount of blood that the heart pumps into an artery in one minute, and is also called cardiac output per minute. "Ml / min" is used as the unit of cardiac output. Peripheral vascular resistance is the resistance of blood flow to occur within a blood vessel. It is also called systemic vascular resistance (SVR), and is increased by the contraction of blood vessels or the increase of circulating blood flow.

(Display unit 60)
The display unit 60 presents the blood pressure calculated by the blood pressure calculation unit 50. The display unit 60 presents the blood pressure by displaying the blood pressure calculated by the blood pressure calculation unit 50 on the display screen.

The radio wave receiving unit 30, the radio wave side heartbeat timing calculation unit 40, the blood pressure calculation unit 50, and the display unit 60 can use, for example, the technique described in Patent Document 1.

(Operation of non-contact blood pressure measuring device 1)
The operation of the non-contact blood pressure measuring device 1 will be described with reference to FIG.

The non-contact blood pressure measuring device 1 executes steps ST01 to ST11 each time the heartbeat measurement time elapses.

(RAW data acquisition process)
The non-contact blood pressure measuring device 1 executes a RAW data acquisition step of receiving an optical image and continuously outputting RAW data of a predetermined number of pixels at a predetermined timing within the heart rate measurement time (step ST01). As a result, RAW data from the image sensor unit 10 can be continuously acquired.

(Radio side electrocardiogram acquisition process)
After the RAW data acquisition process is completed, the radio wave side electrocardiogram acquisition step of receiving the reflected radio wave, detecting the change in distance due to the beating of the heart of the person to be detected, and acquiring the electrocardiogram data is executed (step ST03). ).

(Radio wave side heartbeat timing calculation process)
After the RAW data acquisition step and the radio wave side electrocardiogram acquisition step are completed, the heartbeat timing of the detected person calculated based on the time change of the radio wave signal is output as the radio wave heartbeat timing (step ST05).

(Receiving ECG acquisition process)
The pulse wave as shown in FIG. 6 is calculated by subtracting the noise calculated from the B component from the value calculated from the G component of the RAW data output from the image sensor unit 10 at predetermined intervals (step ST07). ..

(Receiving heartbeat timing calculation process)
The heartbeat time HR is calculated from the acquired pulse wave, and the heartbeat timing of the detected subject is further calculated from the heartbeat time HR (step ST09).

(Blood pressure calculation process)
After both the radio wave side heartbeat timing calculation step and the light receiving side heartbeat timing calculation step are completed, the blood pressure of the detected subject is calculated based on the time difference (pulse wave propagation time) between the received heartbeat timing and the radio wave heartbeat timing (pulse wave propagation time). Step ST11).

In this way, the non-contact blood pressure measuring device 1 calculates the blood pressure of the detected person.
In order to improve the measurement accuracy of the non-contact blood pressure measuring device 1, it is preferable that the RAW data acquisition step and the radio wave side electrocardiogram acquisition step are continuously executed without any time.

Further, the RAW data acquisition step and the radio wave side electrocardiogram acquisition step may be executed at the same time.

Further, either of the radio wave side heartbeat timing calculation step and the light receiving side heartbeat timing calculation step may be executed first, or may be executed at the same time.

(Non-contact blood pressure measuring device 1a)
The non-contact blood pressure measuring device 1a according to the second embodiment of the present invention will be described with reference to FIGS. 7 and 8.

As shown in FIG. 7, the non-contact blood pressure measuring device 1a omits the radio wave receiving unit 30 and the radio wave side heartbeat timing calculating unit 40 of the non-contact blood pressure measuring device 1, and omits the image sensor unit 10 and the receiving side heartbeat timing calculating unit 20. The number of is two.

That is, the non-contact blood pressure measuring device 1a has two image sensor units 10 and two light receiving side heartbeat timing calculation units so that the blood pressure of the detected person can be measured in a non-contact manner within a predetermined heartbeat measurement time. 20 and a blood pressure calculation unit 50 are provided.

Each image sensor unit 10 is the same as the image sensor unit 10 of the non-contact blood pressure measuring device 1. Each light-receiving side heartbeat timing calculation unit 20 is the same as the light-receiving side heartbeat timing calculation unit 20 of the non-contact blood pressure measuring device 1. In the non-contact blood pressure measuring device 1a of the second embodiment, the number of the image sensor unit 10 and the light receiving side heartbeat timing calculation unit 20 will be described as 2, but it may be 3 or more. The number of image sensor units 10 is the same as the number of light receiving side heartbeat timing calculation units 20.

The two image sensor units 10 measure different parts of the subject to be detected. For example, the two image sensor units 10 image the palms of the right and left hands of the person to be detected, respectively.

The blood pressure calculation unit 50 calculates the blood pressure of the subject to be detected based on the two received heartbeat timings.

(Operation of non-contact blood pressure measuring device 1a)
The operation of the non-contact blood pressure measuring device 1a will be described with reference to FIG.

(1st and 2nd RAW data acquisition process)
The non-contact blood pressure measuring device 1a executes the same first and second RAW data acquisition steps as the RAW data acquisition step on the two image sensor units 10 as in the RAW data acquisition step (steps ST21 and ST23). ..
As a result, the RAW data of the detected person is acquired at two places.

(First light receiving side electrocardiogram acquisition process)
The pulse wave is calculated by subtracting the noise calculated from the B component from the value calculated from the G component of the RAW data output from the first image sensor unit 10 at predetermined intervals (step ST25).

(First light receiving side heartbeat timing calculation process)
After the first light-receiving side electrocardiogram acquisition step is completed, the heartbeat time HR is calculated from the acquired pulse wave, and further, the first heartbeat timing of the detected person is calculated from the heartbeat time HR (step ST27).

(Second light receiving side electrocardiogram acquisition process)
The pulse wave is calculated by subtracting the noise calculated from the B component from the value calculated from the G component of the RAW data output from the second image sensor unit 10 at predetermined intervals (step ST29).

(Second light receiving side heartbeat timing calculation process)
After the second light-receiving side electrocardiogram acquisition step is completed, the heartbeat time HR is calculated from the acquired pulse wave, and further, the second heartbeat timing of the detected subject is calculated from the heartbeat time HR (step ST31).

(Blood pressure calculation process)
After both the first and second light receiving side heartbeat timing calculation steps are completed, the blood pressure of the detected subject is calculated based on the first and second light receiving heartbeat timings (step ST33).

In general, it is known that the hemodynamics of a living body differ between the left and right sides of the body. For example, in dizziness patients, it is known that the left and right mean arterial pressure or pulse pressure are different from each other. Therefore, if the non-contact blood pressure measuring device 1a is used, the disease can be detected from the difference between the left and right blood pressures.
In this way, the non-contact blood pressure measuring device 1 calculates the blood pressure of the detected person.

(Non-contact blood pressure measuring device 1b)
The non-contact blood pressure measuring device 1b according to the third embodiment of the present invention will be described with reference to FIGS. 9 to 11.

As shown in FIG. 9, the non-contact blood pressure measuring device 1b omits the radio wave receiving unit 30 and the radio wave side heartbeat timing calculation unit 40 of the non-contact blood pressure measuring device 1, and one image sensor unit 10 and two receiving side heartbeats. This is the timing calculation unit 20.

(Image sensor unit 10)
As shown in FIG. 10, the image sensor unit 10 of the non-contact blood pressure measuring device 1b has the same structure as the image sensor unit 10 of the non-contact blood pressure measuring device 1, but the photodiodes 13a, 13b, 13c of the image sensor 13 The operating range is different. The image sensor unit 10 has a time interval shorter than a predetermined time interval according to the number of frame rates of the image sensor unit when receiving light in the light receiving range of the image sensor unit, is narrower than the light receiving range of the image sensor unit, and is at a position different from each other. A plurality of RAW data are output for each of the plurality of specific light receiving ranges.

The plurality of grid-like cells in FIG. 10 indicate the positions of the photodiodes 13a, 13b, and 13c. The image sensor unit 10 operates only the photodiodes 13a, 13b, and 13c in the two operating ranges 13A and 13B surrounded by the thick line in FIG. The operating ranges 13A and 13B of the image sensor unit 10 are each within the range of 10 to 100 pixels. As a result, the detection range is narrower than the detection range of the image sensor unit 10 of the non-contact blood pressure measuring device 1, but the processing capacity of the image sensor unit 10 is improved. As a result, when the frame rate number of the image sensor unit 10 of the non-contact blood pressure measuring device 1 was 60, the frame rate number of the image sensor unit 10 of the non-contact blood pressure measuring device 1b was increased without adding a special device. It can be 1000.

In this way, the image sensor unit 10 cuts out only 10 to 100 pixels from the multi-pixels, which is the entire operating range, and directly outputs the RAW data, so that the image sensor unit 10 has only the G component purely from the RAW data. It is possible to realize a simple and inexpensive non-contact blood pressure measuring device capable of transmitting pixel data as an image in real time.

Further, in order to appropriately measure the heart rate, it is necessary to perform sensing with a sampling of 125 Hz or higher, and in order to appropriately measure an electrocardiogram, it is necessary to perform sensing with a sampling of about 1000 Hz. A general high-speed camera that satisfies these conditions is large in size and expensive. However, although the image sensor unit 10 of the non-contact blood pressure measuring device 1b includes a general image sensor, by limiting the operating range, it is possible to output 1000 fps satisfying these conditions.

The image sensor unit 10 outputs two RAW data from the two operating ranges 13A and 13B, respectively.

(Light receiving side heartbeat timing calculation unit 20)
The two light receiving side heartbeat timing calculation units 20 each receive two RAW data. The two light-receiving side heartbeat timing calculation units 20 are the same as the two light-receiving side heartbeat timing calculation units 20 of the non-contact blood pressure measuring device 1a.

(Operation of non-contact blood pressure measuring device 1b)
The operation of the non-contact blood pressure measuring device 1b will be described with reference to FIG.

(RAW data acquisition process)
The non-contact blood pressure measuring device 1b executes a RAW data acquisition step of outputting two RAW data from one image sensor unit 10 (step ST41).
As a result, the RAW data of the detected person is acquired at two places.

(First light receiving side electrocardiogram acquisition process)
The pulse wave is calculated by subtracting the noise calculated from the B component from the value calculated from the G component of the RAW data output from the image sensor unit 10 at predetermined intervals (step ST43).

(First light receiving side heartbeat timing calculation process)
After the first light-receiving side electrocardiogram acquisition step is completed, the heartbeat time HR is calculated from the acquired pulse wave, and further, the first heartbeat timing of the detected subject is calculated from the heartbeat time HR (step ST45).

(Second light receiving side electrocardiogram acquisition process)
The pulse wave is calculated by subtracting the noise calculated from the B component from the value calculated from the G component of the RAW data output from the image sensor unit 10 at predetermined intervals (step ST47).

(Second light receiving side heartbeat timing calculation process)
After the second light receiving side electrocardiogram acquisition step is completed, the heartbeat time HR is calculated from the acquired pulse wave, and further, the second heartbeat timing of the detected subject is calculated from the heartbeat time HR (step ST49).

(Blood pressure calculation process)
After both the first and second light-receiving side heartbeat timing calculation steps are completed, the blood pressure of the subject to be detected is calculated based on the first and second light-receiving heartbeat timings (step ST51).
In this way, the non-contact blood pressure measuring device 1 calculates the blood pressure of the detected person.

A measuring device 200 including the non-contact blood pressure measuring device 1a according to the present invention will be described with reference to FIG.

(Measuring device 200)
The measuring device 200 includes a body weight measuring unit 220 on which the person to be detected is placed, a body fat measuring unit 210 for measuring the body fat percentage, and a non-contact blood pressure measuring device 1a. An image sensor unit 10 of the non-contact blood pressure measuring device 1a and a radio wave receiving unit 30 are attached to the body fat measuring unit 210.

When measuring the subject, the subject rides on the weight measuring unit 220, his arms extend horizontally forward, and his hands hold the body fat measuring unit 210. As a result, the two image sensor units 10 photograph the inside of the hand, and the radio wave receiving unit 30 receives the reflected radio wave reflected near the chest of the detected person. This makes it possible to measure blood pressure while measuring body weight and body fat percentage.

Although the measuring device 200 has been described as including the non-contact blood pressure measuring device 1a, it may be the non-contact blood pressure measuring device 1 or the non-contact blood pressure measuring device 1b.

Although each embodiment has been described in detail, the present invention is not limited to a specific embodiment, and various modifications and modifications can be made within the scope of the claims. It is also possible to combine all or a plurality of the components of the above-described embodiment.

As is clear from the above description, the non-contact blood pressure measuring devices 1, 1a, and 1b can all process RAW data as described in Patent Document 1 and observe it by a human. It does not have an image processing engine that converts it to a skin image. Therefore, since the heartbeat can be calculated from the RAW data acquired by the image sensor unit without calculating the brightness, it is possible to provide an inexpensive and high-performance non-contact blood pressure measuring device.

1, 1a, 1b Non-contact blood pressure measuring device 10 Image sensor unit 11 Lens layer 11a Micro lens 12 Color filter layer 12a, 12b, 12c Color filter 13 Image sensor 13a, 13b, 13c Photodiode 20 Light receiving side heart rate timing calculation unit 30 Radio wave Receiver 40 Radio side heart rate timing calculation unit 50 Blood pressure calculation unit 60 Display unit 200 Measuring device 210 Body fat measurement unit 220 Weight measurement unit

Claims (7)

A non-contact blood pressure measuring device that non-contactly measures the blood pressure of a subject within a predetermined heart rate measurement time.
An image sensor unit that receives the reflected light reflected by the person to be detected within the heart rate measurement time, and an image sensor unit that outputs RAW data at predetermined time intervals according to the number of frame rates of the image sensor unit. ,
A light-receiving heartbeat timing calculation unit that outputs the heartbeat timing of the detected person calculated based on the time change of the G component of the RAW data as a light-receiving heartbeat timing, and
A radio wave receiving unit that receives reflected radio waves that reflect radio waves within the heart rate measurement time and outputs them as radio wave signals.
A radio wave side heartbeat timing calculation unit that outputs the heartbeat timing of the detected person as a radio wave heartbeat timing calculated based on the time change of the radio wave signal, and
A blood pressure calculation unit that calculates the blood pressure of the person to be detected based on the received heartbeat timing and the radio wave heartbeat timing.
A non-contact blood pressure measuring device. The radio wave side heartbeat timing calculation unit calculates two radio wave side heartbeat peak times at which the distance between the detected person and the radio wave receiving unit peaks based on the time change of the radio wave signal. The non-contact blood pressure measuring device according to claim 1, wherein the time between the two radio wave side heartbeat peak times is calculated as the radio wave side heartbeat timing. A non-contact blood pressure measuring device that non-contactly measures the blood pressure of a subject within a predetermined heartbeat measurement time, and includes a plurality of image sensor units, a plurality of light receiving side heartbeat timing calculation units, and a blood pressure calculation unit. Each image sensor unit receives each of a plurality of reflected light reflected by the person to be detected within the heart rate measurement time, and a plurality of image sensor units are provided at each predetermined time interval according to the number of frame rates of each image sensor unit. Output each of the RAW data of
Each light-receiving side heartbeat timing calculation unit outputs each of the plurality of heartbeat timings of the detected person calculated based on the time change of the G component of each RAW data as each of the plurality of light-received heartbeat timings.
The blood pressure calculation unit is a non-contact blood pressure measuring device that calculates the blood pressure of the person to be detected based on the plurality of received heartbeat timings. A non-contact blood pressure measuring device that non-contactly measures the blood pressure of a subject within a predetermined heart rate measurement time.
An image sensor unit that receives the reflected light reflected by the person to be detected within the heart rate measurement time, and is a predetermined value according to the number of frame rates of the image sensor unit when receiving light within the light receiving range of the image sensor unit. An image sensor unit that outputs a plurality of RAW data to a plurality of specific light receiving ranges at different positions, which are narrower than the light receiving range of the image sensor unit at a time interval shorter than the time interval.
A plurality of light receiving side heartbeat timing calculation units, each of which calculates each of a plurality of heartbeat timings as each of a plurality of light receiving side heartbeat timings based on the time change of the G component of each RAW data.
A blood pressure calculation unit that calculates the blood pressure of the person to be detected based on the plurality of light-receiving side heartbeat timings.
A non-contact blood pressure measuring device comprising. The non-contact blood pressure measuring device according to claim 4, wherein the image sensor unit does not output RAW data in a range other than the plurality of specific light receiving ranges. The non-contact blood pressure measuring device according to claim 4 or 5, wherein the image sensor unit has a frame rate number larger than the frame rate number when outputting RAW data in the light receiving range. The light-receiving side heartbeat timing calculation unit calculates two adjacent light-receiving side heartbeat peak times that are pulsating peaks of the heartbeat of the subject based on the time change of the G component of the RAW data, and the two light-receiving side heartbeat peak times. The non-contact blood pressure measuring device according to any one of claims 1 to 6, wherein the time between the peak heartbeat times is calculated as the heartbeat timing on the light receiving side.

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