JP2021060318A - Device and method for detecting staying-in-bed - Google Patents

Abstract

To reduce the discomfort and prevent reduction of a detection accuracy.SOLUTION: A staying-in-bed detector 1 includes a sensor device 2 for sending a transmission wave using an electric wave as a medium, receiving a reflection wave as the transmission wave reflected by an object, and outputting the difference between the transmission wave and the reflection wave as a sensor signal. The staying-in-bed detector 1 includes: a determination device for determining whether a person is staying in bed on the basis of the sensor signal; and a supporting member 4 fixed to the bed for supporting the sensor device 2. The staying-in-bed detector 1 has an adjustment mechanism 5 for adjusting the relative position of the sensor device 2 to the supporting member 4.SELECTED DRAWING: Figure 4

Description

The present disclosure relates to a bed detection device and a bed detection method, and more specifically, to a bed detection device and a bed detection method for detecting whether or not a person is in bed (being in bed).

As a conventional example, the bed leaving detection device described in Patent Document 1 will be illustrated. The bed leaving detection device described in Patent Document 1 is provided with one sensor composed of a pyroelectric infrared sensor that captures a person's movement at each of the upper part and the lower part of a pole erected on a base. The sensor installed on the upper part of the pole is installed above the upper surface of the bed, for example, in order to detect the upper body of the subject sitting on the bed. Further, the sensor installed at the lower part of the pole is installed below the upper surface of the bed in order to detect the leg of the subject sitting on the bed. It should be noted that these two sensors can move in the axial direction (vertical direction) of the pole with respect to the pole, and can rotate around the pole.

Japanese Patent No. 6530544

By the way, in the conventional example described in Patent Document 1, a person lying on the bed (being in bed) can be detected by a sensor installed above the upper surface of the bed, but the sensor is easily in the human field of view. Therefore, it may cause discomfort to people. Since the sensor is a pyroelectric infrared sensor, if there is something that blocks infrared rays between the sensor and the person in the bed (for example, a comforter), it is not possible to detect the person lying on the bed.

An object of the present disclosure is to provide a bed-based detection device and a bed-based detection method capable of suppressing a decrease in detection accuracy and making it less likely to cause discomfort.

The bed-based detection device according to one aspect of the present disclosure transmits a transmission wave using a radio wave as a medium, receives a reflected wave in which the transmitted wave is reflected by an object and returns, and determines the difference between the transmitted wave and the reflected wave. It is equipped with a sensor device that outputs as a sensor signal. The floor detection device includes a determination device that determines whether or not a person is in bed based on the sensor signal, a support member that supports the sensor device and is fixed to the bed, and the support member. It is provided with an adjusting mechanism capable of adjusting the relative position of the sensor device with respect to the relative position.

The bed-based detection method according to one aspect of the present disclosure uses the bed-based detection device to detect whether or not a person is in bed. In the floor detection method, the support member is fixed to a side surface of the bed along the longitudinal direction, and the transmitted wave is transmitted from the sensor device onto the bed.

The bed-based detection device and the bed-based detection method of the present disclosure have the effect of suppressing a decrease in detection accuracy and making it less likely to cause discomfort.

FIG. 1 is a block diagram of the floor detection device according to the embodiment of the present disclosure. FIG. 2 is a side view of the floor detection device and the bed in a state where the floor detection device of the same is fixed to the bed. FIG. 3 is a plan view of the floor detection device and the bed in a state where the floor detection device of the same is fixed to the bed. FIG. 4 is a perspective view of the above-mentioned floor detection device as viewed from the front. FIG. 5 is a bottom view of the above-mentioned floor detection device. FIG. 6 is a perspective view seen from the rear of a modified example of the above-mentioned floor detection device. FIG. 7 is a bottom view of a modified example of the above-mentioned floor detection device.

Hereinafter, the floor detection device 1 and the floor detection method using the floor detection device 1 according to the embodiment of the present disclosure will be described in detail with reference to the drawings. However, each figure described in the following embodiment is a schematic view, and the ratio of the size and the thickness of each component does not necessarily reflect the actual dimensional ratio. The configuration described in the following embodiments is only an example of the present disclosure. The present disclosure is not limited to the following embodiments, and various changes can be made depending on the design and the like as long as the effects of the present disclosure can be achieved.

The bed detection device 1 (hereinafter referred to as the bed detection device 1) according to the embodiment is, for example, whether or not a patient (person 7) admitted to the hospital is in bed 9 in the hospital room. Used to detect (absence). Alternatively, the bed-based detection device 1 is used to detect whether or not the care-requiring person (person 7) who is in the long-term care facility is in bed 9 (absence or absence) (see FIG. 2). ).

As shown in FIG. 1, the floor detection device 1 includes a sensor device 2 and a determination device 3.

The sensor device 2 includes a transmitting antenna 21, a receiving antenna 22, a radio wave transmitting / receiving unit 23, and a signal processing unit 24. The transmitting antenna 21 and the receiving antenna 22 are formed of, for example, a conductor (copper foil) printed on a printed wiring board. The radio wave transmission / reception unit 23 has a variable frequency oscillator (frequency synthesizer) and a mixer.

The variable frequency oscillator generates a transmission wave signal to which linear frequency modulation is applied, for example, by linearly changing the frequency of a sine wave having a reference frequency of 24 GHz.

The mixer detects the phase by mixing the transmitted wave signal and the output signal (reflected wave signal) of the receiving antenna 22, and outputs a beat signal having a frequency equal to the frequency difference between the transmitted wave signal and the reflected wave signal. The frequency of the beat signal is the distance from the transmitting antenna 21 and the receiving antenna 22 to the object reflecting the transmitted wave, depending on the sweep frequency width (for example, 100 to 200 MHz) and the sweep time (for example, 1 ms) of the transmitted wave signal. It becomes the corresponding frequency.

The signal processing unit 24 samples the analog beat signal output from the radio wave transmitting / receiving unit 23, converts it into a digital beat signal by quantization, and outputs the converted digital beat signal to the determination device 3. .. The signal processing unit 24 is preferably composed of a microcontroller having a CPU (Central Processing Unit), a memory, an AD (Analog-to-Digital) converter, and the like.

The determination device 3 has a calculation unit 31 and a determination unit 32. However, the determination device 3 has a microcontroller, and the CPU of the microcontroller realizes the respective functions of the calculation unit 31 and the determination unit 32 by executing a program corresponding to each of the following processes. There is.

The calculation unit 31 executes a fast Fourier transform process on the digital beat signal input from the sensor device 2. The beat signal in the frequency domain subjected to the fast Fourier transform has a peak at a frequency corresponding to the distance from the sensor device 2 to the object. However, when the transmitted wave signal is reflected by a plurality of objects, the beat signal in the frequency domain has a plurality of peaks. The calculation unit 31 extracts a frequency having a peak equal to or higher than a predetermined threshold value from the beat signal in the frequency domain. The calculation unit 31 calculates a distance (distance from the sensor device 2 to the object) for each extracted frequency, and outputs the calculated distance (distance data) to the determination unit 32.

The determination unit 32 selects only the distance data below the threshold value from the distance data input in time series from the calculation unit 31, and stores the distance data together with the measured time in the memory. The threshold value of the distance data is a value that does not fall below the maximum value of the distance from the sensor device 2 to the person 7 who is in bed 9.

The determination unit 32 determines that the person 7 is in bed 9 during the period in which the distance data selected and stored in the memory is measured. Further, the determination unit 32 determines that the person 7 is not in bed (absent) during the period when the distance data is not stored in the memory. Then, the determination device 3 outputs information on the presence and absence of the floor (bed information) by the determination unit 32. It is preferable that the bed information output from the determination device 3 is transmitted to, for example, a computer system installed in a nurse station of a hospital or a management room of a long-term care facility.

As shown in FIG. 2, the floor detection device 1 is installed on the side surface (side surface along the longitudinal direction) of the bed 9 on which the person 7 lies down. When the floor detection device 1 is installed on the side surface along the longitudinal direction of the bed 9, the detection range S1 of the bed detection device 1 (the range in which the transmitted wave of the sensor device 2 reaches) is viewed from above the bed 9. It spreads in a fan shape (see Fig. 3). Therefore, at least a part of the body of the person 7 lying on the bed 9 is always present in the detection range S1 of the bed detection device 1.

By the way, in a room in which a bed 9 is placed (for example, a hospital room), a curtain 8 may be installed to block sunlight incident from a window (see FIG. 3). Further, in a room in which a plurality of beds 9 are placed, a partition curtain 8 may be installed between adjacent beds 9. When the floor detection device 1 is attached to the lower surface of the headboard 902 or the footboard 903 or the mattress 91 of the bed 9, a part of the curtain 8 swayed by the wind enters the detection range S1 to allow the person 7 to enter the detection range S1. There is a possibility that the bed detection device 2 erroneously detects the presence of the person 7 even though the person 7 is not in bed.

On the other hand, as shown in FIG. 2, the floor detection device 1 is installed on the side surface of the bed 9 along the longitudinal direction, so that the curtain 8 enters the detection range S1 of the bed detection device 1. Hateful. Therefore, the floor detection device 1 can prevent a foreign matter such as the curtain 8 from being mistakenly detected as a person 7.

Next, the structure of the floor detection device 1 will be described in detail with reference to the drawings.

As shown in FIGS. 4 and 5, the floor detection device 1 has a rectangular parallelepiped housing 6, a support member 4 for supporting the housing 6 on the bed 9, and a relative of the housing 6 to the support member 4. It is provided with an adjustment mechanism 5 that can adjust a specific position. In the following description, unless otherwise specified, the up-down, left-right, and front-back directions indicated by the arrows in FIG. 4 are defined as the up-down, left-right, and front-back directions of the floor detection device 1.

The housing 6 is formed in a rectangular parallelepiped shape with a material (for example, synthetic resin) that easily transmits radio waves. The sensor device 2 is housed inside the housing 6. The determination device 3 may be housed together with the sensor device 2 inside the housing 6. When the determination device 3 is arranged outside the housing 6, the sensor device 2 inside the housing 6 and the determination device 3 outside the housing 6 are electrically connected by a communication cable.

Two rectangular grooves 61 are formed on the front wall 60 of the housing 6. These two grooves 61 are formed one by one at the left end and the right end of the front wall 60. Further, the longitudinal direction of each groove 61 coincides with the vertical direction of the housing 6. The width of each groove 61 is larger than the diameter of the threaded portion 510 of the first bolt 51 and smaller than the diameter of the head portion 511 of the first bolt 51.

The support member 4 is formed of a rectangular parallelepiped box shape by a synthetic resin. The length of the support member 4 in the vertical direction is sufficiently smaller than the length in the front-rear direction and the left-right direction. Further, an opening is formed on the rear surface of the support member 4 (see FIG. 4).

The adjusting mechanism 5 has a base 50, two first bolts 51, two first nuts 52, two second bolts 53, and two second nuts 54.

The base 50 is formed of a synthetic resin in the shape of a rectangular parallelepiped whose length in the vertical direction is sufficiently smaller than the length in the front-rear direction and the left-right direction. An opening is formed on the rear surface of the base 50. Further, two rectangular grooves 500 are formed on the lower surface of the base 50 (see FIG. 5). These two grooves 500 are arranged in the left-right direction with a predetermined interval so that their longitudinal directions coincide with each other in the front-rear direction. The width of each groove 500 is larger than the diameter of the threaded portion of the second bolt 53 and smaller than the diameter of the head of the second bolt 53.

The base 50 is inserted into the support member 4 through the opening (see FIGS. 4 and 5). Each threaded portion 510 of the two first bolts 51 is inserted into a through hole provided at each of the left and right ends of the front surface of the support member 4. Each threaded portion 510 is inserted into a through hole provided at each of the left and right ends of the front surface of the base 50. Further, one tip of each screw portion 510 is inserted into each of the two grooves 61 of the housing 6. Then, inside the housing 6, the first nut 52 is screwed into the tip of each threaded portion 510 one by one (see FIG. 5).

Further, each threaded portion of the two second bolts 53 is inserted into the two through holes provided on the lower surface of the support member 4, one by one. Further, one tip of each screw portion is inserted into each of the two grooves 500 on the lower surface of the base 50. Then, inside the base 50, the second nut 54 is screwed into the tip of each threaded portion one by one (see FIG. 5).

The support member 4 can move in the vertical direction with respect to the housing 6 by inserting the two first bolts 51 into the two grooves 61. Then, when the two first bolts 51 are tightened, the base 50 is pressed against the front wall 60 of the housing 6 by the head 511 of the two first bolts 51 and the two first nuts 52, and the housing is received. The vertical movement of the support member 4 with respect to the body 6 is restricted.

Further, the support member 4 can be moved in the front-rear direction with respect to the base 50 (housing 6) by inserting the two second bolts 53 into the two grooves 500. Then, when the two second bolts 53 are tightened, the support member 4 is pressed against the base 50 by the heads of the two second bolts 53 and the two second nuts 54, and the base 50 (housing 6). ), The front-back movement of the support member 4 is restricted. As described above, the support member 4 is fixed to the housing 6 by tightening the two first bolts 51 and the two second bolts 53, respectively.

The floor detection device 1 is fixed to the side surface of the bed 9 along the longitudinal direction by inserting the support member 4 between the mattress 91 and the bed pad 92, for example (see FIG. 2). Further, it is preferable that the floor detection device 1 is fixed substantially at the center of the side surface of the bed 9 along the longitudinal direction. However, the floor detection device 1 may be fixed to the side surface of the bed 9 along the longitudinal direction by inserting the support member 4 between the bottom 900 of the bed frame 90 and the mattress 91.

Here, in the floor detection device 1, the radio wave transmitted from the transmission antenna 21 of the sensor device 2 is radiated into the space through the front wall 60 of the housing 6, and the radio wave reflected by the object is transmitted through the front wall 60 to the sensor device. It is received by the receiving antenna 22 of 2. Therefore, if there is a gap between the front wall 60 of the housing 6 and the side surface of the bed 9 (the side surface of the mattress 91 or the side surface of the bed pad 92), the radio waves reflected by the side surface of the bed 9 are behind the floor detection device 1. It may be received by the receiving antenna 22 after being reflected on the wall or the curtain 8. If there is a gap between the front wall 60 of the housing 6 and the side surface of the bed 9 in this way, the detection accuracy of the floor detection device 1 may decrease.

Further, the distance between the floor detection device 1 and the person 7 differs depending on the thickness (height) of the mattress 91 and the bed pad 92. Therefore, if the position of the bed detection device 1 with respect to the bed 9 is too low, the accuracy of detecting the presence of the person 7 in the bed is lowered, and if the position of the bed detection device 1 with respect to the bed 9 is too high, the housing 6 is the person 7. It may be in sight and cause discomfort.

Thus, the floor detection device 1 can accommodate the sensor device 2 inside the housing 6 and adjust the relative position of the housing 6 (sensor device 2) with respect to the support member 4 by the adjusting mechanism 5. .. Therefore, in the floor detection device 1, it is possible to suppress a decrease in detection accuracy by substantially eliminating a gap between the front wall 60 of the housing 6 and the side surface of the bed 9. Further, in the floor detection device 1, by adjusting the position of the housing 6 with respect to the support member 4, it is possible to make it difficult for the housing 6 to enter the field of view of the person 7 lying on the bed 9. Therefore, the bed-based detection device 1 is less likely to cause discomfort to the person 7 when the housing 6 is included in the field of view of the person 7 lying on the bed 9. As a result, the floor detection device 1 can suppress a decrease in detection accuracy and make it less likely to cause discomfort.

Next, the floor detection method according to the embodiment of the present disclosure will be described. In the floor detection method according to the embodiment, the support member 4 is fixed to the side surface of the bed 9 along the longitudinal direction as described above, and the transmitted wave is transmitted from the sensor device 2 onto the bed 9. As described above, when the floor detection device is installed on the lower surface of the mattress 91 or on the headboard 902 or the footboard 903, there is a high possibility that a foreign matter such as the curtain 8 is mistakenly detected as a person 7.

On the other hand, according to the floor detection method according to the embodiment, since the floor detection device 1 is installed on the side surface of the bed 9 along the longitudinal direction, the curtain 8 is within the detection range S1 of the bed detection device 1. It is difficult to enter, and it is possible to prevent a foreign substance such as a curtain 8 from being mistakenly detected as a person 7. Further, in the floor detection method according to the embodiment, the relative position of the housing 6 (sensor device 2) with respect to the support member 4 is adjusted by the adjusting mechanism 5, thereby giving discomfort while suppressing a decrease in detection accuracy. It can be made difficult.

Next, a modified example of the floor detection device 1 will be described. The floor detection device 1 of the modified example is characterized by the adjustment mechanism 5, and the configuration other than the adjustment mechanism 5 is common to the floor detection device 1 according to the embodiment. Therefore, among the configurations of the floor detection device 1 of the modified example, the same reference numerals are given to the configurations common to the floor detection device 1 according to the embodiment, and the description thereof will be omitted as appropriate.

As shown in FIGS. 6 and 7, the floor detection device 1 of the modified example has one rectangular parallelepiped-shaped protrusion 62 at each of the front ends of the left and right side surfaces of the housing 6. A rectangular groove 63 is formed on the rear surface of each protrusion 62. The longitudinal direction of each groove 63 coincides with the vertical direction of the housing 6. The width of each groove 63 is larger than the diameter of the threaded portion 510 of the first bolt 51 and smaller than the diameter of the head portion 511 of the first bolt 51.

Further, one rectangular parallelepiped-shaped protrusion 501 is formed on each of the left and right ends of the base 50 of the adjusting mechanism 5 (see FIG. 7). In the base 50, a portion in front of the two protrusions 501 is inserted into the support member 4 through the opening (see FIG. 7). Each thread 510 of the two first bolts 51 is inserted into each groove 63 of the two protrusions 62 one by one (see FIG. 6). Each threaded portion 510 is inserted into a through hole that penetrates each protruding portion 501 of the base 50 in the front-rear direction. The first nut 52 is screwed one by one into the tip of each threaded portion 510 protruding from the front surface of each protruding portion 501 (see FIG. 7).

Further, each threaded portion of the two second bolts 53 is inserted into the two through holes provided on the lower surface of the support member 4, one by one. Further, one tip of each screw portion is inserted into each of the two grooves 500 on the lower surface of the base 50. Then, inside the base 50, the second nut 54 is screwed into the tip of each threaded portion one by one (see FIG. 7).

Thus, the base 50 can be moved in the vertical direction with respect to the housing 6 by inserting the two first bolts 51 into the grooves 63 of the two protrusions 501. Then, when the two first bolts 51 are tightened, the base 50 is pressed against the front wall 60 of the housing 6 by the head 511 of the two first bolts 51 and the two first nuts 52, and the housing is received. The vertical movement of the support member 4 with respect to the body 6 is restricted.

Further, the support member 4 can be moved in the front-rear direction with respect to the base 50 (housing 6) by inserting the two second bolts 53 into the two grooves 500. Then, when the two second bolts 53 are tightened, the support member 4 is pressed against the base 50 by the heads of the two second bolts 53 and the two second nuts 54, and the base 50 (housing 6). ), The front-back movement of the support member 4 is restricted. As described above, the support member 4 is fixed to the housing 6 by tightening the two first bolts 51 and the two second bolts 53, respectively.

The configuration of the adjustment mechanism 5 described above is an example, and for example, the support member may be configured to be attached to the side rail provided on the bed frame 90.

Further, in the floor detection device 1, among the plurality of side walls of the housing 6, the side wall (rear wall) on the side opposite to one side of the plurality of side surfaces of the bed 9 is formed so as not to transmit radio waves. It is preferable to have. For example, a conductor such as a metal plate may be attached to the rear wall of the housing 6, or a sheet-shaped radio wave absorber may be attached to the rear wall of the housing 6. Alternatively, the rear wall of the housing 6 may be formed of a metal plate.

As described above, when the side wall (rear wall) on the side opposite to one side of the plurality of side surfaces of the bed 9 among the plurality of side walls of the housing 6 is formed so as not to transmit radio waves, for example, The possibility that the radio wave (transmitted wave) reflected on the rear wall of the housing 6 is received by the receiving antenna 22 is reduced. As a result, the floor detection device 1 can reduce erroneous detection of being in the floor.

As described above, the bed-based detection device (1) according to the first aspect of the present disclosure transmits a transmitted wave using radio waves as a medium, receives a reflected wave in which the transmitted wave is reflected by an object and returns, and receives the transmitted wave. It is provided with a sensor device (2) that outputs the difference between the reflected wave and the reflected wave as a sensor signal. The floor detection device (1) according to the first aspect is a determination device (3) for determining whether or not a person (7) is in bed on the bed (9) based on a sensor signal, and a sensor device (2). ) Is supported and is provided with a support member (4) fixed to the bed (9). The floor detection device (1) according to the first aspect includes an adjustment mechanism (5) capable of adjusting the relative position of the sensor device (2) with respect to the support member (4).

The floor detection device (1) according to the first aspect lies on the bed (9) by adjusting the relative position of the sensor device (2) with respect to the support member (4) by the adjustment mechanism (5). When the sensor device (5) enters the field of view of the person (7), it is unlikely to cause discomfort. As a result, the floor detection device (1) according to the first aspect can make it difficult to give discomfort while suppressing a decrease in detection accuracy.

The floor detection device (1) according to the second aspect of the present disclosure can be realized in combination with the first aspect. In the floor detection device (1) according to the second aspect, the support member (4) is preferably fixed to the side surface of the bed (9). The adjusting mechanism (5) preferably moves the sensor device (2) along the height direction of the bed (9) and the direction perpendicular to the side surface of the bed (9).

The floor detection device (1) according to the second aspect can widen the adjustment range of the position of the sensor device (2) relative to the support member (4).

The floor detection device (1) according to the third aspect of the present disclosure can be realized in combination with the second aspect. In the floor detection device (1) according to the third aspect, the support member (4) is among the bed frame (90) of the bed (9) and the mattress (91) mounted on the bed frame (90). The floor detection device (1) according to the third aspect, which is fixed to at least one of them, can simplify the work of fixing the support member (4) to the bed (9).

The floor detection device (1) according to the fourth aspect of the present disclosure can be realized by combining with any one of the first to third aspects. In the floor detection device (1) according to the fourth aspect, it is preferable that the determination device (3) calculates the distance from the sensor device (2) to the object based on the sensor signal.

The floor detection device (1) according to the fourth aspect can reduce the possibility of erroneous detection due to the movement of an object other than the person (7), as compared with the case where the movement of an object is detected by the sensor device. ..

The floor detection device (1) according to the fifth aspect of the present disclosure can be realized in combination with the fourth aspect. In the floor detection device (1) according to the fifth aspect, the determination device (3) is the distance from the sensor device (2) to an arbitrary place on the bed (9) and from the sensor device (2) to the object. It is preferable to determine that the person (7) is in bed (9) when the distances are equal or shorter.

The floor detection device (1) according to the fifth aspect can improve the detection accuracy of the person (7) in bed.

The floor detection device (1) according to the sixth aspect of the present disclosure can be realized by combining with any one of the first to fifth aspects. In the floor detection device (1) according to the sixth aspect, it is preferable to include a housing (6) for accommodating the sensor device (2). The support member (4) is preferably configured so as to protrude from one side surface of the plurality of side surfaces of the housing (6).

In the floor detection device (1) according to the sixth aspect, the support member (4) protruding from the side surface of the housing (6) is placed in the gap between the beds (9) (such as the gap between the mattress 91 and the bed pad 92). The housing (6) can be fixed to the bed (9) by inserting it into the bed.

The floor detection device (1) according to the seventh aspect of the present disclosure can be realized in combination with the sixth aspect. In the floor detection device (1) according to the seventh aspect, among the plurality of side walls of the housing (6), the side wall opposite to one side of the plurality of side surfaces of the bed (9) transmits radio waves. It is preferable that it is formed so as not to be formed.

The floor detection device (1) according to the seventh aspect reduces the possibility that the radio wave reflected on the rear wall of the housing (6) is received by the sensor device (2), and causes an error in the floor. Detection can be reduced.

In the bed detection method according to the eighth aspect of the present disclosure, a person (7) is placed on the bed (9) by using the bed detection device (1) according to any one of the first to seventh aspects. Detects whether or not is in bed. In the floor detection method according to the eighth aspect, the support member (4) is fixed to the side surface of the bed (9) along the longitudinal direction, and the transmitted wave is transmitted from the sensor device (2) onto the bed (9). ..

In the bed detection method according to the eighth aspect, the transmitted wave of the sensor device (2) is transmitted from the side surface along the longitudinal direction of the bed (9), so that the detection accuracy is suppressed and the discomfort is less likely to be given. can do.

The bed-based detection method according to the ninth aspect of the present disclosure can be realized in combination with the eighth aspect. In the floor detection method according to the ninth aspect, it is preferable to fix the support member (4) to the side surface so that the sensor device (2) is arranged at the center of the side surface in the longitudinal direction.

The bed-based detection method according to the ninth aspect can detect a wide range on the bed (9).

The bed-based detection method according to the tenth aspect of the present disclosure can be realized in combination with the eighth or ninth aspect. In the floor detection method according to the tenth aspect, it is preferable to adjust the relative position of the sensor device (2) with respect to the support member (4) by the adjustment mechanism (5).

The floor detection method according to the tenth aspect is a person (7) lying on the bed (9) by adjusting the relative position of the sensor device (2) with respect to the support member (4) by the adjusting mechanism (5). ) Is less likely to cause discomfort when the sensor device (5) enters the field of view. As a result, the bed-based detection method according to the tenth aspect can make it less likely to cause discomfort.

1 Floor detection device 2 Sensor device 3 Judgment device 4 Support member 5 Adjustment mechanism 6 Housing 7 people 9 beds 90 Bed frame 91 Mattress

Claims (10)

A sensor device that transmits a transmitted wave using a radio wave as a medium, receives a reflected wave that the transmitted wave is reflected by an object and returns, and outputs the difference between the transmitted wave and the reflected wave as a sensor signal.
A determination device that determines whether or not a person is in bed based on the sensor signal, and
A support member that supports the sensor device and is fixed to the bed,
An adjustment mechanism that makes it possible to adjust the relative position of the sensor device with respect to the support member, and
To prepare
Floor detection device. The support member is fixed to the side surface of the bed and
The adjusting mechanism moves the sensor device along the height direction of the bed and the direction perpendicular to the side surface of the bed.
The floor detection device according to claim 1. The support member is fixed to at least one of the bed frame of the bed and the mattress mounted on the bed frame.
The floor detection device according to claim 2. The determination device calculates the distance from the sensor device to the object based on the sensor signal.
The floor detection device according to any one of claims 1 to 3. The determination device determines that a person is in the bed when the distance from the sensor device to an arbitrary location on the bed is equal to or shorter than the distance from the sensor device to the object.
The floor detection device according to claim 4. A housing for accommodating the sensor device is provided.
The support member is configured to protrude from one side of the plurality of sides of the housing.
The floor detection device according to any one of claims 1 to 5. Of the plurality of side walls of the housing, the side wall opposite to one side surface of the plurality of side surfaces of the bed is formed so as not to transmit radio waves.
The floor detection device according to claim 6. A bed detection method for detecting whether or not a person is in bed using the bed detection device according to any one of claims 1 to 7.
The support member is fixed to the side surface along the longitudinal direction of the bed, and the support member is fixed.
The transmitted wave is transmitted from the sensor device onto the bed.
Floor detection method. The support member is fixed to the side surface so that the sensor device is arranged at the center of the side surface in the longitudinal direction.
The bed detection method according to claim 8. The adjustment mechanism adjusts the relative position of the sensor device with respect to the support member.
The bed-based detection method according to claim 8 or 9.

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