JP6816575B2 - Body movement detection device and watching system - Google Patents

Description

The present invention relates to a body movement detection device and a monitoring system, and for example, relates to a body movement detection device for detecting abnormalities in the health condition of a person who spends time in a nursing facility, and a monitoring system provided with the body movement detection device. ..

A monitoring system for detecting abnormalities in the health condition of a person spending time in a nursing facility or hospital and sending an emergency call to a caregiver or a nurse has been conventionally known. People who spend time in care facilities and hospitals are more likely to fall indoors, fall out of bed, stop breathing while sleeping, and have abnormal heartbeats, but the caregivers and nurses who support their lives in the facility are relative. Because the number of people is small, it is not possible to accompany them all the time. The monitoring system is for solving such a problem, and an example thereof is a safety monitoring device proposed in Patent Document 1.

The safety monitoring device described in Patent Document 1 acquires biological information such as microbody movements due to the subject's breathing from the reflected waves of radio waves radiated toward the subject, and is tested from the biological information. It monitors the safety of the person. A Doppler sensor that uses microwaves (radio waves) is used to acquire the biological information of the subject, which makes it possible to correctly detect the respiration of the subject.

In the monitoring system that uses a radio wave detection unit such as a Doppler sensor as described above, in order to eliminate noise caused by the movement of the curtain and the vibration of the refrigerator, the directivity of the radio wave detection unit is increased to aim at the target bed position. It is necessary to radiate radio waves accurately. Therefore, in nursing care facilities and hospitals where beds are moved or expanded indoors, a monitoring system that can easily adjust the radiation direction of radio waves emitted by the radio wave detection unit is required. The directional adjustment system described in Patent Document 2 is for solving such a problem. An adjustment jig with a light source is attached to a radio wave detection unit, and the directional adjustment of radio waves is performed while observing the irradiation position of the light source. It is configured to perform.

Japanese Unexamined Patent Publication No. 2012-75861 Japanese Unexamined Patent Publication No. 2016-214357

In the safety monitoring device described in Patent Document 1, consideration is not given to the change in the radiation direction of the radio wave emitted by the Doppler sensor. Further, it is difficult to identify which direction the radiation direction is in because the radio wave cannot be seen, and therefore, there is a problem that it takes time and effort to adjust the radiation direction of the radio wave emitted by the Doppler sensor.

In the orientation adjustment system described in Patent Document 2, since the light source, the lens, the battery, etc. are attached to the tip of the adjustment jig, the radio wave detection unit and the adjustment jig may not be in close contact with each other. Therefore, there is a problem that it is difficult to obtain stable accuracy. There is also a problem that the adjusted direction shifts when the adjusting jig is removed.

The present invention has been made in view of such a situation, and an object of the present invention is to be able to accurately adjust the radiation direction of radio waves for detecting the biological information of a subject with a simple configuration. The purpose is to provide a motion detection device and a monitoring system equipped with the device.

In order to achieve the above object, the body motion detection device of the first invention is configured to radiate and receive radio waves for detecting the biological information of the subject, and to change the radiation direction of the radio waves. It is a body motion detection device that has a radio wave detection unit.
The radio wave detection unit
A body motion detection element that detects body motion generated by radiating and receiving the radio waves, and
A light source that emits visible light and
A body motion detection element substrate on which the body motion detection element and a floodlight light source are mounted in a fixed state, and
The radio lens unit having a positive lens action with respect to the radio wave radiated from the body motion detection element and the light projecting lens unit having a positive lens action with respect to the visible light radiated from the light projecting light source. The integrally formed transparent resin lens member and
It has a body motion detection element substrate and a support member that supports the lens member in a fixed state .
The support member
A horn unit that collects radio waves radiated from the body motion detection element by a reflection action,
A diaphragm section that narrows down the visible light emitted from the light source
It is characterized by having.

In the first invention, the body motion detection device of the second invention has a shape in which the horn portion has an inverted truncated cone-shaped hole and is rotationally symmetric with respect to the horn central axis passing through the center of the hole. Have and
The projection light source, the diaphragm portion, and the projection lens portion form a projection optical system for adjusting the radiation direction of the radio wave.
The projection optical system has a common axis whose projection optical axis is a straight line passing through the emission center of visible light emitted by the projection light source, the opening center of the aperture portion, and the center of the projection lens portion. Consists of the optical system
The light projection axis is parallel to the central axis of the horn .

The monitoring system of the third invention is characterized by including a body motion detecting device according to the first or second invention and a server device that communicates with the body motion detecting device .

Fourth watch system of the present invention, said Oite to the third invention, further, a plurality of reflecting spheres or reflective hemisphere mat lined semispherical plurality of projections, the time of adjusting the radiation direction of the radio wave It is characterized in that it is provided so as to be placed on the target of the radio wave detection unit .

According to the present invention, a body motion detection element substrate on which a body motion detection element and a projection light source are mounted in a fixed state, and a lens member in which a radio wave lens portion and a projection lens portion are integrally formed are supported members. Since it is supported in a fixed state, the relative positional relationship between the body motion detection element, the radio lens unit, the light projecting light source, and the light projecting lens unit is accurately and stably determined. Therefore, the radiation direction of the radio wave obtained by the body motion detection element and the radio wave lens unit can be exactly the same as the radiation direction of the visible light obtained by the light projecting light source and the light projecting lens unit. Based on the position of the visible light emitted from the lens unit, it is possible to accurately adjust the radiation direction of the radio wave for detecting the biological information of the subject with a simple configuration, and it is possible to obtain stable accuracy. it can.

The schematic diagram which shows the schematic structure of the embodiment of the monitoring system. The block diagram which shows the schematic structure of the embodiment of the monitoring system. The schematic cross-sectional view which shows the embodiment of the body motion detection device. FIG. 3 is an enlarged view of a main part showing a radio wave detection unit constituting the body motion detection device of FIG. The graph which shows the relationship between the relative permittivity and the reflectance coefficient of microwave with respect to the radio wave lens material. The flowchart which shows the specific example of the direction adjustment sequence of the body motion detection device of FIG. The schematic diagram for demonstrating the direction adjustment method of the body motion detection device of FIG. The schematic diagram for demonstrating another orientation adjustment method of the body motion detection device of FIG.

Hereinafter, the body movement detection device, the monitoring system, and the like in which the present invention has been carried out will be described with reference to the drawings. It should be noted that the same parts and corresponding parts of each embodiment are designated by the same reference numerals, and duplicate description will be omitted as appropriate.

The schematic diagram of FIG. 1 and the block diagram of FIG. 2 show a schematic configuration of the monitoring system 1 according to the embodiment of the present invention. This monitoring system 1 is composed of a body motion detection device 2, a server device 3, etc. For example, as shown in FIG. 1, a wired LAN (Local Area Network) 4, a staff station 5, a room (nursing room, hospital room, etc.) ) Installed in facilities equipped with 6th grade (nursing care facilities, hospitals, etc.). The room 6 is a place where the subject 8 such as a care recipient and a patient spends time, and the staff station 5 is a station for caregivers and nurses who support the life of the subject 8. Although there are two rooms 6 shown in FIG. 1, the monitoring system 1 can be adopted in a facility having more rooms 6 with the same configuration.

A server device 3 is installed in the staff station 5, and a body motion detection device 2 is installed in the center of the ceiling portion 6a of each room 6. In addition, a bed 7 used by the subject 8 is installed in the corner of each room 6. One bed 7 is installed in each room 6 shown in FIG. 1, but when two or more subjects 8 move in, a plurality of beds 7 having the same number as the number of subjects 8 are installed. .. The body motion detection device 2 and the server device 3 are communicably connected by a wired LAN 4, and communication is performed between the staff station 5 and each room 6 via the wired LAN 4. A wireless LAN may be installed instead of the wired LAN 4. Further, although only one representative body motion detection device 2 is shown in FIG. 2, the other body motion detection devices 2 are similarly configured.

As shown in FIG. 2, the server device 3 that communicates with the body motion detection device 2 is composed of a main control unit 10, a storage unit 11, a display unit 12, and the like, and can be controlled remotely. ing. The main control unit 10 is composed of a calculation unit 10a and other electronic components, and obtains information from the body motion detection device 2 based on a program, data, or the like stored or input in advance in the storage unit 11 or the like. At the same time, a series of processes for detecting an abnormality or the like of the subject 8 is executed. The storage unit 11 stores programs, data, and the like related to control and setting in the monitoring system 1. The programs, data, and the like stored in the storage unit 11 are sequentially read out by the main control unit 10.

The display unit 12 is composed of a display device (for example, a liquid crystal display) used by a computer, and displays an indoor image of the room 6 received from the body motion detection device 2, biological information of the subject 8, and the like. Further, the display unit 12 is configured to be able to display markers, orientation indexes, and the like before and after the adjustment of the radiation direction of the radio wave (microwave). The display unit 12 may be a display device of a mobile terminal or the like (for example, a smartphone) owned by a caregiver or a nurse and linked to the server device 3.

As described above, the body motion detection device 2 is installed in the center of the ceiling portion 6a of each room 6 (FIG. 1), and the radiation direction of the radio wave is adjusted with the bed 7 as the target of the radio wave detection unit 21. When two or more subjects 8 move into the room 6 and beds 7 corresponding to each of the subjects 8 are installed, a plurality of body motion detection devices 2 adjusted for the beds 7 of each subject 8 Is installed.

FIG. 3 shows a schematic cross-sectional structure of the body motion detection device 2, and FIG. 4 shows an enlarged view of the radio wave detection unit 21 constituting the body motion detection device 2. As shown in FIG. 3, the body motion detection device 2 has a ceiling-embedded form in which a part thereof is above the ceiling portion 6a, that is, embedded in the ceiling, and the portion embedded in the ceiling is It is covered with the main body housing 24. The main body housing 24 has a cylindrical shape with an open lower surface, and a base plate 26, an outer cover 30 for imaging, and an outer cover 31 for radio wave detection are attached so as to cover the lower surface of the opening.

Inside the main body housing 24, as shown in FIG. 3, a main board 25 provided with a control unit 20 (FIG. 2) and radio waves (radio waves for detecting biological information of the subject 8 (FIG. 1)). A radio wave detection unit 21 that emits and receives microwaves W1 and W2 and is configured so that the radiation direction of the radio wave W1 can be changed is provided. As shown in FIG. 4, the radio wave detection unit 21 mounts a Doppler element (sensor body) 21a, a light source 21b that emits visible light V1, a Doppler element 21a, and a light source 21b in a fixed state. It has a substrate 21c (body motion detection element substrate).

The Doppler element 21a is a microwave Doppler sensor provided with a radiating unit and a receiving unit, and the deviation between the radiated wave from the radiating unit and the reflected wave to the receiving unit (that is, the Doppler generated by radiating and receiving radio waves). Shift) is detected and output. For example, a microwave in the 24 GHz band is radiated toward the bed 7 (FIG. 1), reflected by the subject 8 to receive a Doppler-shifted reflected wave, and the reflected wave is caused by the subject 8's breathing and heartbeat. Biological information such as microwave movement is detected, and the respiratory state and heart rate of the subject are acquired from the biological information. Not limited to the method of detecting Doppler shift, phase shift detection and body movement detection using distance change (FMCW mode) are also possible. In the phase shift detection, microwaves having different phases and orthogonal to each other are emitted to detect the phase shift of the two waves in the reflected wave. In this case, since the two waves are orthogonal to each other, they can be detected without interference, and the direction can also be detected. When using distance change, shift the frequency of the microwave and radiate it, calculate the distance of the object by observing the change in the time delay of the reflected wave, judge that distance change = body movement, and detect body movement. Do.

Since the microwave Doppler sensor has the property of detecting everything that is moving, breathing with relatively small movement is easily buried in noise. Therefore, in order to increase the directivity of the microwave and improve the SN ratio (Signal-to-Noise ratio), the radio wave detection unit 21 has a radome on the microwave radiation side. The radome is composed of a lens member LN made of transparent resin and a support member HN that supports the Doppler substrate 21c and the lens member LN in a fixed state.

As shown in FIG. 4, the support member HN narrows down the horn portion Ha that aggregates the radio waves (radiated waves) W1 radiated from the Doppler element 21a by the reflection action and the visible light V1 radiated from the light projecting light source 21b. A diaphragm portion Hb is provided. Further, the lens member LN has a radio wave lens portion La having a positive lens action on the radio wave W1 radiated from the Doppler element 21a and a positive lens action on the visible light V1 radiated from the light projecting light source 21b. The light projecting lens portion Lb having the above is integrally formed. Since the detection area of the Doppler element 21a is narrowed by the radio wave aggregation in the predetermined direction by the horn unit Ha and the radio wave lens unit La, the radio wave (reflected wave) W2 from the subject 8 is highly accurate due to its high directivity. It becomes possible to receive with.

The horn portion Ha has a shape having a mortar-shaped (inverted truncated cone shape) hole, and has a shape rotationally symmetric with respect to the horn central axis AX that vertically passes through the center of the hole. A horn-shaped reflective surface made of metal or the like is formed on the inner peripheral surface forming the hole of the horn portion Ha. A support member HN is fixed to the lower surface of the Doppler substrate 21c so that the Doppler element 21a fits inside a hole on the small diameter opening side of the horn portion Ha. In the lens member LN, a brim portion Lc is formed around the radio wave lens portion La. A lens member LN is fixed to the lower surface of the support member HN with a brim portion Lc so as to cover a hole on the large diameter opening side of the horn portion Ha. Further, the radio wave lens unit La has a lens surface that is convex downward, and the central axis of the lens surface coincides with the radiation central axis of the radio wave W1 emitted by the Doppler element 21a, and they are horns. It is arranged so as to be substantially parallel to the central axis AX.

The lens member LN is made of a transparent resin material having high transmittance for both radio waves W1 and W2 and visible light V1. The graph of FIG. 5 shows the relationship between the relative permittivity ε'r and the reflectance coefficient | Γ | of microwaves. As can be seen from FIG. 5, the reflectance is proportional to the relative permittivity, and the loss coefficient is also proportional to the relative permittivity. Since a low dielectric constant material has a low reflectance to radio waves, if a low dielectric constant material is used for the lens member LN, the reflectance to radio waves is lowered and the transmittance to radio waves (the rate remaining excluding reflection and loss) is increased. It is possible to do. Examples of such a resin material having a low dielectric constant include PC (polycarbonate), COP (cyclo-olefin polymer) resin, PMMA (polymethylcrylic) and the like. The visible light transmittance is 80 to 90% for PC, 90 to 95% for PMMA, and 0% for ABS and PTFE. Therefore, PC, COP resin, and PMMA, which transmit both visible light and radio waves well, are suitable for the lens member LN, and ABS and PTFE, which are opaque to visible light, are not suitable for the lens member LN. Since glass has a high radio wave reflectance of about 40 to 50% (relative permittivity of 5.5 to 9), it is not suitable for a lens member LN.

The light projecting light source 21b, the diaphragm unit Hb, and the light projecting lens unit Lb shown in FIG. 4 constitute a floodlight optical system 33 for adjusting the radiation direction of the radio wave W1 by adjusting the direction of the body motion detection device 2. The projection optical system 33 projects a straight line passing through the radiation center of the visible light V1 emitted by the projection light source 21b, the opening center of the aperture portion Hb, and the center of the projection lens portion Lb for focusing. It constitutes a co-axis optical system with an optical axis ax. The floodlight axis ax is parallel to the horn central axis AX and perpendicular to the element mounting surface of the Doppler substrate 21c. The light emitting light source 21b fixed to the Doppler substrate 21c is a light emitting element such as an LED (light emitting diode) that emits visible light V1, and most of it is a support member HN except for the opening constituting the aperture Hb. It is covered. Therefore, the visible light V1 radiated from the light projecting light source 21b is focused by the focusing unit Hb formed on the support member HN, and then condensed by the light emitting lens unit Lb having a positive lensing action to generate radio waves. A light spot is formed in the radiation direction of W1. The adjustment of the radiation direction of the radio wave, which will be described later, is performed using the focused visible light V1.

The radio wave detection unit 21 is configured so that the radiation direction of the radio wave W1 (FIG. 4) can be changed by the direction changing mechanism including the pitch rotation mechanism 27 and the yaw rotation mechanism 28 shown in FIG. The pitch rotation mechanism 27 is composed of a shaft portion 27a or the like that projects outward from the outer surface of the support member HN, and makes the radio wave detection unit 21 rotatable about the pitch axis P. The yaw rotation mechanism 28 is a support frame 28a rotatably supported by the main body housing 24 about the yaw axis Y (corresponding to the yaw center axis AX and substantially orthogonal to the pitch axis P), and its outer peripheral surface. It is composed of a flange portion (not shown) and the like extending outward in the radial direction. The support frame 28a has a cylindrical shape with an open lower surface, and the shaft portion 27a supports the pitch rotation mechanism 27 inside the support frame 28a. The direction changing mechanism configured in this way makes it possible to change the radiation direction of the radio wave W1 emitted by the radio wave detection unit 21.

The control unit 20 (FIG. 2) provided on the main board 25 is electrically connected to the outside by a LAN cable 4a or the like to enable communication and power supply. The control unit 20 is composed of a functional block or the like composed of a calculation unit, a storage unit, and other electronic components, and the radio wave detection unit 21 or the like is based on a program or data stored or input in advance in the storage unit or the like. It controls the operation of the components and executes signal processing related to the detection of the state of the subject.

Below the ceiling portion 6a, as described above, the base plate 26, the exterior cover 30 for imaging, and the exterior cover 31 for radio wave detection are arranged so as to project from the ceiling portion 6a. The base plate 26 is provided on the lower surface of the ceiling portion 6a and is connected to the lower edge portion of the main body housing 24. The exterior covers 30 and 31 have a rectangular shape larger than the lower surface of the opening of the main body housing 24 and cover the lower surface of the opening. One exterior cover 30 is fixed to the base plate 26 fixed to the ceiling portion 6a, while the other exterior cover 31 is detachably attached to the exterior cover 30. That is, the exterior cover 31 functions as a lid that can be opened and closed with respect to the exterior cover 30. Therefore, if the exterior cover 31 is removed, the orientation of the radio wave detection unit 21 can be changed manually, so that the radiation orientation of the radio wave W1 can be manually adjusted. The radiation direction of the radio wave W1 may be adjusted by using a drive source such as a motor.

The exterior cover 30 for imaging has a substantially tray shape that is convex downward and has an internal space that communicates with the inside of the main body housing 24, and the optical detection unit 22 and the light source 23 are in the internal space. Etc. are provided. The optical detection unit 22 constitutes a camera for detecting the state of the subject 8 by the image, and detects a large body movement of the subject 8 such as getting up, getting out of bed, and falling by the image. There is. Further, the optical detection unit 22 has a wide-angle lens so that the angle of view is the entire room 6, and it is possible to take an image of the entire room 6. Further, the optical detection unit 22 is not provided with an IR cut filter, and the light source 23 for illumination is composed of a near-infrared light LED or the like so that the state of the subject 8 can be detected as an image even in a pitch-black environment. ing. Therefore, the exterior cover 30 needs to be made of a material that transmits near-infrared light. Further, in order to prevent the occurrence of mental stress of the subject 8, it is preferable that the exterior cover 30 is made of a material that blocks visible light so that the optical detection unit 22 cannot be seen.

In the internal space of the exterior cover 30, a speaker (not shown) for outputting sound toward the inside of the room 6 is provided in a state of being fixed to the base plate 26 as an element pointing downward. A microphone (not shown) for inputting sound in the room 6 is provided in a state of being fixed to the exterior cover 31.

The exterior cover 30 is provided with an opening 30a at a position corresponding to the radio wave detection unit 21. The opening 30a has a shape and a size that allows the inside (upper side) and the outside (lower side) of the exterior cover 30 to communicate with each other so that the radio wave detection unit 21 can be seen from the lens member LN side when viewed from below. doing. Correspondingly, the exterior cover 31 detachably provided on the lower surface of the exterior cover 30 has a shape and size that covers the opening 30a of the cover 30 and the area including the periphery thereof from below. The exterior cover 31 is made of a material that is positioned so as to cover the radio wave in the radiation direction of the radio wave W1 and that transmits the radio wave.

The exterior cover 31 that functions as a lid of the exterior cover 30 is made of a resin material having a uniform or substantially uniform thickness and a relatively low dielectric constant. Since a low dielectric constant material has a low reflectance to radio waves, if a low dielectric constant material is used for the exterior cover 31, the reflectance to radio waves is lowered and the transmittance to radio waves (the rate remaining excluding reflection and loss) is increased. It is possible to do. Examples of such a resin material having a low dielectric constant include PC (polycarbonate) and ABS (acrylonitrile butadiene styrene).

Next, a method of adjusting the direction of the body motion detection device 2 for adjusting the radiation direction of the radio wave W1 will be described. A specific example of the orientation adjustment sequence of the body motion detection device 2 is shown in the flowchart of FIG. 6, and a state of orientation adjustment of the body motion detection device 2 is schematically shown in FIG. Since the radio wave detection unit 21 is configured so that the radiation direction of the radio wave W1 can be changed, the worker 18 sets the stepladder 9 or the like inside the room 6 to adjust the radiation direction of the radio wave W1 as shown in FIG. Use it manually. When the worker 18 inputs the device number on the handheld mobile terminal or the server device 3 to set the body motion detection device 2 in the corresponding room 6 to the adjustment mode (# 10 in FIG. 6), the adjustment mode is set. The body motion detection device 2 blinks the projection light source 21b for adjusting the orientation (LED blinking of # 20 in FIG. 6). When the worker 18 removes the exterior cover 31 (FIG. 3), a blinking light spot S is formed 2 m to 3 m below by the visible light V1 emitted from the light projecting optical system 33.

When the light spot S is visible as shown in FIG. 7 (for example, when the room is dark), the orientation of the radio wave detection unit 21 is manually changed while observing the position of the light spot S. The radiation central axis of the radio wave W1 is substantially parallel to and close to the projection optical axis ax of the projection optical system 33 for directional adjustment, and is almost one to the projection optical axis ax from the scale of the room 6. I am doing it. Therefore, if the irradiation position of the light spot S is adjusted on the bed 7, the irradiation direction of the visible light V1 is directed to the bed 7, and the radiation direction of the radio wave W1 is also directed to the bed 7. Since the visible light V1 can be seen even if the radio wave W1 cannot be seen, the radiation direction of the radio wave W1 can be easily grasped from the irradiation position of the easily visible light spot S. When adjusting the radiation direction of the radio wave W1, the optical detection unit 22 may be used to confirm the position of the light spot S in an image.

When the light spot S is not visible (for example, when the room is bright), the orientation adjustment method shown in FIG. 8 is adopted. In this orientation adjustment method, the reflective sphere 19 is spread over the target bed 7, or the reflective hemispherical mat 19a in which substantially hemispherical protrusions are arranged is arranged on the bed 7. When the light spot S hits the reflective sphere 19 or the reflective hemispherical mat 19a, the blinking visible light V2 reaches the eyes of the worker 18 on the stepladder 9 regardless of the orientation. Since only the sphere or hemisphere hit by the light spot S shines, the radiation direction of the radio wave W1 can be adjusted with the same feeling as when working in a dark environment. Since the blinking of the projection light source 21b is performed only for the purpose of making it easy to distinguish, the projection light source 21b may be turned on. When the adjustment is completed, the operator 18 fixes the orientation of the body motion detection device 2, returns the exterior cover 31 to the original mounting state, and cancels the adjustment mode (# 30 in FIG. 6).

According to the above-described embodiment, the Doppler substrate 21c on which the Doppler element 21a and the projection light source 21b are mounted in a fixed state, and the lens member LN in which the radio wave lens portion La and the projection lens portion Lb are integrally formed. However, since it is supported by the support member HN in a fixed state, the relative positional relationship between the Doppler element 21a, the radio lens portion La, the projection light source 21b, and the projection lens portion Lb is accurately and stably determined. Therefore, the radiation direction of the radio wave W1 obtained by the Doppler element 21a and the radio wave lens unit La and the radiation direction of the visible light V1 obtained by the projection light source 21b and the light projection lens unit Lb can be exactly the same. Therefore, it is possible to accurately adjust the radiation direction of the radio wave W1 for detecting the biological information of the subject 8 with a simple configuration based on the position of the visible light V1 emitted from the light projecting lens unit Lb. , Stable accuracy can be obtained.

Since the support member HN has a horn portion Ha that aggregates the radio waves W1 radiated from the Doppler element 21a by a reflection action, the Doppler element 21a, the radio wave lens portion La, the projection light source 21b, and the projection lens portion Lb The radio wave W1 from the Doppler element 21a can be efficiently incident on the radio wave lens unit La while maintaining the relative positional relationship of the horn unit Ha accurately and stably, and the radio wave W1 from the radio wave lens unit La can be efficiently incident. The radio wave W2 can be efficiently incident on the Doppler element 21a. Further, since the support member HN has an aperture portion Hb that narrows down the visible light V1 emitted from the projection light source 21b, the Doppler element 21a, the radio wave lens portion La, the projection light source 21b, and the projection lens portion Lb The visible light V1 from the projection light source 21b can be efficiently incident on the projection lens unit Lb while maintaining the relative positional relationship of the aperture portion Hb accurately and stably.

Further, as in the above-described embodiment, the orientation of the body motion detection device 2 including the radio wave detection unit 21 that radiates the radio wave W1 and receives the radio wave W2 in order to detect the biological information of the subject 8 is adjusted. In this case, the radio wave detection unit 21 is used by using the radio wave lens unit La and the light projecting lens unit Lb integrally formed of a transparent resin material having high transmittance for both radio waves W1 and W2 and visible light V1. If visible light V1 having the same radiation direction as the radio wave W1 emitted from the radio wave W1 is irradiated from the radio wave detection unit 21 to a predetermined position, the light spot S obtained by the irradiation becomes an accurate guideline for the radiation direction of the radio wave W1. Therefore, by changing the irradiation position of the light spot S, it is possible to easily adjust the direction of the body motion detection device 2 for adjusting the radiation direction of the radio wave W1.

It is preferable that the visible light V1 emitted from the light projecting optical system 33 forms a light spot S 2 m to 3 m ahead of the light projecting optical system 33. Considering the height of the ceiling portion 6a of a general room 6, if the light spot S is formed at the above position, the irradiation direction of the visible light V1 emitted from the projection optical system 33 can be easily identified. Therefore, the adjustment of the radiation direction of the radio wave W1 emitted by the radio wave detection unit 21 becomes even easier. Further, since the light spot S needs to be formed to be smaller than the width size of the bed 7, when the height of the ceiling portion 6a is 2.2 m to 2.4 m, the size of the light spot S is 30 cm or less in diameter. Is preferable. Further, when a plurality of reflective spheres 19 or reflective hemispherical mats 19a are used (FIG. 8), the diameter size of each sphere is preferably smaller than the size of the light spot S. By setting the size, it is possible to increase the reflection efficiency of visible light V1.

Although the embodiments of the present invention have been described above, the scope of the present invention is not limited to this, and various modifications can be made without departing from the gist of the invention. For example, the configuration for directional adjustment in the above-described embodiment is an example, and is not limited thereto. In addition, the body movement detection device according to the present invention can be used in a monitoring system for detecting abnormalities in the health condition of a person who spends time in a nursing care facility or the like.

1 Watching system 2 Body motion detection device 3 Server device 8 Subject 18 Worker 19 Reflective sphere 19a Reflective hemisphere mat 21 Radio wave detection unit 21a Doppler element (body motion detection element)
21b Floodlight source 21c Doppler substrate (body motion detection element substrate)
LN lens member La radio wave lens part Lb floodlight lens part Lc brim part HN support member Ha horn part Hb aperture part AX horn center axis ax light projection axis 27 pitch rotation mechanism 28 yaw rotation mechanism 30 exterior cover for imaging 31 radio wave detection Exterior cover for 33 Orientation projection optical system W1, W2 radio waves V1, V2 Visible light for azimuth adjustment

Claims (4)

A body motion detection device having a radio wave detection unit that emits and receives radio waves for detecting the biological information of a subject and has a structure in which the radiation direction of the radio waves can be changed.
The radio wave detection unit
A body motion detection element that detects body motion generated by radiating and receiving the radio waves, and
A light source that emits visible light and
A body motion detection element substrate on which the body motion detection element and a floodlight light source are mounted in a fixed state, and
The radio lens unit having a positive lens action with respect to the radio wave radiated from the body motion detection element and the light projecting lens unit having a positive lens action with respect to the visible light radiated from the light projecting light source. The integrally formed transparent resin lens member and
It has a body motion detection element substrate and a support member that supports the lens member in a fixed state .
The support member
A horn unit that collects radio waves radiated from the body motion detection element by a reflection action,
A diaphragm section that narrows down the visible light emitted from the light source
A body motion detection device characterized by having. The horn portion has a shape having an inverted truncated cone-shaped hole, and has a shape rotationally symmetric with respect to the horn central axis passing through the center of the hole.
The projection light source, the diaphragm portion, and the projection lens portion form a projection optical system for adjusting the radiation direction of the radio wave.
The projection optical system has a common axis whose projection optical axis is a straight line passing through the emission center of visible light emitted by the projection light source, the opening center of the aperture portion, and the center of the projection lens portion. Consists of the optical system
The body motion detection device according to claim 1, wherein the light projection axis is parallel to the central axis of the horn . A monitoring system comprising the body motion detection device according to claim 1 or 2 and a server device that communicates with the body motion detection device. Further, a reflective hemispherical mat in which a plurality of reflective spheres or a plurality of substantially hemispherical protrusions are arranged is provided so as to be arranged on the target of the radio wave detection unit when adjusting the radiation direction of the radio wave. The monitoring system according to claim 3.

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