JP2016129569A - On-bed state detection device for bed and on-bed state detection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an on-bed state detection device for a bed and an on-bed state detection method by and with which an on-bed state of a user can be reliably detected.SOLUTION: An on-bed state detection device includes: area-setting means which sets a bed-rest area 30A where a gravity position G (GX, GY) of a user U exists when the user U takes a sleeping posture, and a seating area 30B comprising a region other than the bed-rest area 30A to a bed 30; a plurality of load-detection means which detects load applied on each end part of the bed 30; and on-bed state detection means which detects an on-bed state of the user U on the bed 30 on the basis of a plurality of output values W1 to W4 from the plurality of load detection means. The on-bed state detection means includes: on-bed state decision means which decides whether the user U on the bed 30 is in an on-bed state or in a seating state on the basis of the plurality of output values W1 to W4 after deciding which of the on-bed region 30A or the seating region 30B of the bed 30 the gravity position G (GX, GY) exist at.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a bed occupancy status detection device and a bed occupancy status detection method for detecting the occupancy status of a bed user who is present on a bed.

  Several methods are known as methods for detecting the presence of a bed user (eg, elderly, sick, healthy) on the bed (eg, bed, sitting, getting out of bed) (for example, Patent Documents 1 to 3). 7). Its basic configuration is as follows.

  Loads applied to the head right end, head left end, foot right end and foot left end of the bed are detected by first to fourth load detection sensors, respectively, and output values (load values) from these load detection sensors are detected. ) To calculate the position of the center of gravity of the user on the bed. And, when the center of gravity position exists in a predetermined bed area of the bed (that is, the area where the user's center of gravity exists when the user on the bed is in the sleeping position), It is determined that the user is in a bedded state. Thereafter, when the center of gravity exists at the end of the bed, it is determined that the user is in the end-sitting position as the user on the bed, and an alarm is issued. Then, caregivers who heard the alarm should go to the user in order to assist the user in getting out of bed or to take measures to prevent the user from falling on the bed. Can do.

JP 2008-264338 A JP 2000-316915 A JP 2007-190269 A JP 2006-305343 A JP 2007-175208 A JP 2007-330658 A JP 2007-330659 A

  However, in the above-described detection method, when the position of the center of gravity of the user on the bed is present in an area that is neither the bedbed area nor the end of the bed, the user's floor condition on the bed cannot be detected.

  The present invention has been made in view of the above-described technical background, and an object of the present invention is to provide a bed occupancy state detection device that can reliably detect a user's occupancy state on the bed and the bed occupancy state. It is to provide a detection method.

  The present invention provides the following means.

[1] Area setting means for setting the bed as a bed area where the center of gravity of the user exists and a seating area other than the bed area when the user on the bed is in a sleeping position;
A plurality of load detecting means for detecting a load applied to each of a plurality of spaced apart portions of the bed for each predetermined detection period;
Occupancy status detection means for detecting the occupancy status of the user on the bed based on a plurality of output values output from the plurality of load detection means,
The presence status detecting means includes
Center-of-gravity position determination means for determining whether the center-of-gravity position of the user on the bed calculated based on the plurality of output values exists in the bed area or the seating area set by the area setting means When,
A stagnation state determination unit that determines whether the user is in a lying state or a sitting state as a stagnation state of the user on the bed based on the plurality of output values after execution of the gravity center position determination unit; , And
The occupancy state determination unit includes a total output value determination unit that determines whether or not a total output value obtained by summing the plurality of output values is equal to or greater than a predetermined threshold, and the total output value determination unit includes the total output value determination unit. When the output value is determined to be greater than or equal to the predetermined threshold, the bed occupancy status detection device determines whether the user is in a bedded state or a seated state in accordance with the bed region where the center of gravity exists. .

[2] The presence state determining means includes
When it is determined by the barycentric position determining unit that the barycentric position is present in the bed area, the bed state determining unit that determines whether the user is in the bed state based on the plurality of output values;
A seating state determining unit that determines whether the user is in a seated state based on the plurality of output values when the center of gravity position determining unit determines that the center of gravity position is present in the seating region; And
The bed state determination means includes, as the total output value determination means, first total output value determination means for determining whether or not the total output value is equal to or greater than a first threshold value α as the predetermined threshold. If the total output value determining means determines that the total output value is greater than or equal to the first threshold value α, it is determined that the user is in a bedridden state,
The seating state determination means includes second total output value determination means for determining whether or not the total output value is equal to or greater than a second threshold value β different from the first threshold value α as the predetermined threshold value. The bed according to the preceding item 1, wherein the bed is provided as a value determination unit, and when the second total output value determination unit determines that the total output value is equal to or greater than the second threshold value β, the user is determined to be in a seated state. In-bed condition detector.

[3] When the bed state determining unit determines that the total output value is equal to or greater than the first threshold value α by the first total output value determining unit, the total output value is equal to or greater than the first threshold value α. A first duration determination unit that determines whether or not the duration of the state is equal to or greater than a third threshold t1, and the first duration determination unit determines that the duration is equal to or greater than the third threshold t1 The user is determined to be in bed,
The seating state determination unit continues the state in which the total output value is equal to or greater than the second threshold value β when the second total output value determination unit determines that the total output value is equal to or greater than the second threshold value β. The second duration determination unit determines whether or not the time is equal to or greater than a fourth threshold t2 different from the third threshold t1, and the second duration determination unit includes the second duration determination unit. 3. The bed occupancy status detection device according to item 2 above, wherein when it is determined that the threshold value is equal to or greater than the threshold t2, the user is determined to be in a sitting state.

  [4] When the bed state determining unit determines that the total output value is equal to or greater than the first threshold value α by the first total output value determining unit, a variation amount per predetermined time of each output value is predetermined. It has a variation amount determining means for determining whether or not it is within the range ± γ, the first duration determining means determines that the duration is not less than the third threshold t1, and the variation amount determining means 4. The bed occupancy status detection device according to item 3 above, wherein when the variation amount of each output value is determined to be within the predetermined range ± γ, the user is determined to be in a bedded state.

[5] The presence status detecting means includes
After the execution of the occupancy state determination means, it comprises a bed-related determination means for determining whether or not the user has performed an operation related to bed leaving,
The bed leaving relation determining means includes
A first bed-related determination unit that determines whether the user has performed an operation related to getting out of bed based on the plurality of output values when the bed state determining unit determines that the user is in the bed state; ,
A second getting-off determining unit that determines whether or not the user has performed an operation related to getting out of the bed based on the plurality of output values when the sitting-up state determining unit determines that the user is in the sitting state; The bed occupancy status detecting device according to any one of the preceding items 2 to 4, further comprising:

[6] The first bed-related determination means includes first bed-related alarm means for issuing a first bed-related alarm when it is determined that the user has performed an operation related to bed removal.
The second getting-off function determining means has second getting-off related alarm means for issuing a second getting-off alarm different from the first getting-off alarm when it is determined that the user has performed an action related to getting out of the bed. The bed occupancy status detection device according to item 5 above.

[7] The first bed leaving determination means includes:
Based on the plurality of output values, a bed leaving preliminary operation determining unit that determines whether the user has performed a bed leaving preliminary operation as one operation related to bed leaving;
If it is determined that the user has performed a preliminary bed leaving operation by the preliminary bed leaving operation determining means, it is determined whether or not the user has performed a bed leaving operation as another operation related to the bed leaving based on the plurality of output values. First leaving bed determining means to
The first bed-related alarm means is:
When it is determined that the user has made a pre-move operation by the pre-move operation determining means, a pre-move operation alarm is issued as one of the first bed-related alarms,
When it is determined by the first bed leaving determination means that the user has made a bed leaving operation, a first bed leaving alarm different from the bed leaving preliminary operation alarm is issued as another alarm among the first bed leaving alarms. The bed occupancy status detection device according to item 6 above, which is configured as described above.

[8] The second getting-off determination means includes a second getting-off determination means for determining whether or not the user has made a getting-off operation as an operation related to getting-off based on the plurality of output values. ,
The second bed related alarm means is configured to issue a second bed alarm as the second bed related alarm when the second bed determining means determines that the user has performed a bed leaving operation. Or the bed occupancy state detection device according to 7.

[9] The presence status detecting means includes
When it is determined that the user does not perform an action related to getting out of bed by the first getting-off related determining means, and when the user determines that the user does not perform an action related to getting out of bed by the second getting-out related determining means In each case, the bed occupancy status detection device according to any one of the preceding items 5 to 8, wherein the bed occupancy status detection means is configured to re-execute.

[10] The presence status detecting means includes
In the case where the presence status detecting means is re-executed,
In the past, when the user has determined that the user is in the bed state by the bed state determining unit, and when the barycentric position determining unit has determined that the barycentric position exists in the seating region, the seating state determination The bed occupancy status detection apparatus according to claim 9, wherein the first bed leaving relation determination unit is configured to execute the first bed leaving determination unit without executing the unit.

[11] A load detection step of detecting a load applied to each of a plurality of spaced apart portions of the bed by a plurality of load detection means corresponding to each portion for each predetermined detection period;
A bed condition detection step of detecting a user's bed condition on the bed based on a plurality of output values output from the plurality of load detection means, and
The presence status detection step includes:
The gravity center position of the user on the bed calculated based on the plurality of output values exists in the bed bed area of the preset bed where the gravity center position of the user exists when the user on the bed is in the sleeping position. Or a center-of-gravity position determination step for determining whether or not it exists in a preset seating area consisting of an area other than the bed area of the bed;
After the center-of-gravity position determination step, based on the plurality of output values, a occupancy state determination step of determining whether the user is in a bedded state or a seated state as the occupant state of the user on the bed; , And
The presence state determination step includes a total output value determination step for determining whether or not a total output value obtained by summing the plurality of output values is equal to or greater than a predetermined threshold, and the total output value determination step includes the total output value determination step. When the output value is determined to be equal to or greater than the predetermined threshold value, the bed occupancy state detection method for determining whether the user is in a bedded state or a seated state in accordance with the bed area where the center of gravity exists. .

  The present invention has the following effects.

  In the previous item [1], the presence state determination means determines whether the user is in a bedded state or a seated state in accordance with the area of the bed where the center of gravity of the user exists on the bed. Here, since the area of the bed is set by the area setting means to the bed area and the seating area other than the bed area, the position of the center of gravity of the user on the bed is the position of the bed bed area and the seating area of the bed. It must exist in one of these areas. Therefore, it is possible to reliably detect the user's bed state on the bed.

  In the previous item [2], the first total output value determining unit of the bed state determining unit uses the first threshold value for determining that the user is in the bed state and the second total output value determining unit of the seating state determining unit. Since the second threshold value for determining that the person is in the sitting state is different, the bedded state and the sitting state can be reliably determined.

  In the preceding paragraph [3], when the bed state determining means determines that the duration of the state in which the total output value is equal to or greater than the first threshold is equal to or greater than the third threshold, the user determines that the user is in the bedded state. The bed state can be determined more reliably.

  In addition, when the sitting state determination unit determines that the duration of the state in which the total output value is equal to or greater than the second threshold is equal to or greater than the fourth threshold, the seating state determination unit determines the seating state by determining that the user is in the sitting state. Furthermore, it can be determined with certainty.

  Moreover, since the third threshold value and the fourth threshold value are different from each other, it is possible to more reliably determine the bedded state and the seated state.

  In the preceding paragraph [4], when the bed state determining means determines that the duration is equal to or greater than the third threshold value and the variation amount of each output value is within the predetermined range, the user is in the bed state. By determining, the bed state can be determined more reliably.

  In the preceding paragraph [5], the bed-related determination means is a separate determination means (first bed-related determination means, second bed-related relation) corresponding to each of the case where the user is in the bedded state and the case of the bedridden state. Determination means), it is possible to make a bed-related determination under a determination condition suitable for each case. Thereby, in each case, it can be determined reliably whether the user performed the operation | movement relevant to getting out of bed.

  In the preceding item [6], the first bed-related alarm issued by the first bed-related alarm means is different from the second bed-related alarm issued by the second bed-related alarm means. Can determine from which area the user has performed an action related to getting out of bed, according to the type of alarm issued.

  In the preceding item [7], the first bed leaving determination means includes the bed leaving preliminary operation determination means and the first bed leaving determination means, so that whether the user in the bedded state performs the bed leaving preliminary operation as the operation related to bed leaving or the bed leaving operation. It is possible to determine whether or not

  Further, a preliminary bed leaving operation alarm that is issued when it is determined by the preliminary bed leaving movement determining means that the user has performed a preliminary bed moving operation, and a second alarm that is issued when the first moving out determining means determines that the user has performed the bed leaving action. Since it is different from the 1 bed leaving alarm, a caregiver or the like to the user can determine whether the user has performed a bed leaving preliminary operation or a bed leaving operation according to the type of alarm issued.

  In the preceding item [8], the second getting-off determining means can determine whether or not the seated user has made a getting-off action as an action related to getting-off by having the second getting-off determining means.

  In the previous item [9], even if the position of the center of gravity of the user on the bed first exists in the sitting area of the bed and the sitting state determination means determines that the user is in the sitting state, When the position of the center of gravity of the person moves to the bed area of the bed, the bed state determining means can determine that the user is in the bed state.

  In the previous item [10], when the user has determined that the user is in the bed in the past, the position of the center of gravity of the user on the bed is moved to the seating area of the bed. However, it is determined whether or not the user has performed an action related to getting out of bed, not by the second getting-off determining means but by the first getting-off determining means instead of executing the sitting state determining means. Thereby, when it is determined that the user is in the bedded state in the past, it is possible to reliably determine the operation related to the user's getting out of bed.

  The previous item [11] has the same effect as the previous item [1].

FIG. 1 is a schematic perspective view showing a bed occupancy state detection device according to an embodiment of the present invention in a used state. FIG. 2 is a schematic plan view of a bed to which the detection device is applied. FIG. 3 is a block diagram showing the configuration of the detection apparatus. FIG. 4 is a flowchart of a bed occupancy state detection method using the detection device. FIG. 5 is a flowchart showing the bed state determination process. FIG. 6 is a flowchart showing a seating state determination step. FIG. 7 is a flowchart showing the first bed leaving determination process. FIG. 8 is a flowchart showing the second bed leaving determination process. FIG. 9 is a schematic perspective view of the bed showing a case where the user on the bed is in the end sitting position.

  Next, an embodiment of the present invention will be described below with reference to the drawings.

  As shown in FIG. 1, a bed occupancy status detection device 20 according to an embodiment of the present invention detects the occupancy status of a bed user U on a bed 30. Examples of the presence of the floor include bed rest, sitting, getting-off related operations, the position of the center of gravity of the user U on the bed 30, the amount of movement, and the frequency of movement.

  The bed 30 is used in medical facilities (eg, hospitals), elderly facilities, nursing homes, general households, etc., and is generally installed on a floor surface 35 in a room such as a bedroom (including a hospital room). It is what is done. Then, the bed 30 is substantially horizontal from below by the head-side right leg 31a, the head-side left leg 31b, the foot-side right leg 31c, and the foot-side left leg 31d as the four legs of the bed 30. It is supported with a distance from 35. A user U is present on the bed 30 mainly for bedtime.

  Examples of the user U include elderly people, sick people (including persons with disabilities), healthy people, and the like. In the present embodiment, it is assumed that the user U is a person (care recipient) who needs care, such as an elderly person or a sick person. In addition, various alarms such as a bed-related alarm are issued to a caregiver (e.g., a nurse, a user's family and relatives) who provides care (including assistance) to the user U as a notification target person. Shall be.

  A bed board 32 and a foot board 33 are provided on the end side on the head side and the foot side of the bed 30 so as to stand up with respect to the bed surface comprising the upper surface of the bed 30.

  Further, in the present embodiment, as shown in FIG. 2, the right side, the left side, and the head side of the user U in a state where the user U is lying on the bed 30 in a lying posture (that is, a posture lying down on his back). The foot side is referred to as the right side, the left side, the head side, and the foot side of the bed 30, respectively.

  As shown in FIG. 1, the detection device 20 of the present embodiment includes four load detection units 1 a to 1 d, an arithmetic unit 2, and the like.

  Each of the load detecting means 1a to 1d detects a load applied to the head side right end portion, the head side left end portion, the foot side right end portion and the foot side left end portion of the bed 30 as a plurality of spaced apart portions of the bed 30, respectively. This is detected at each cycle, for example, a known load cell type load detection sensor, and disclosed in JP 2006-302266 A, JP 2007-167492 A, JP 2008-12202 A, etc. What is disclosed can be used.

  In these load detection means 1a-1d, the load detection means 1a (this is called "the 1st load detection means 1a") arrange | positioned between the lower end of the head side right leg part 31a of the bed 30, and the floor surface 35 is called. The load applied to the right end of the head side of the bed 30 is detected, and the load detection means 1b (this is referred to as “second”) disposed between the lower end of the head side left leg 31b of the bed 30 and the floor surface 35. Load detection means 1b ”) detects the load applied to the left end of the head side of the bed 30, and detects the load disposed between the lower end of the leg side right leg 31c of the bed 30 and the floor surface 35. The means 1c (referred to as "third load detecting means 1c") detects the load applied to the right side end of the foot 30 of the bed 30, and the lower end of the foot side left leg 31d of the bed 30 and the floor 35 The load detecting means 1d arranged between the two That heavy detection means 1d ") is used to detect the load applied to the foot side left portion of the bed 30.

  From each load detection means 1a-1d, the load values W1-W4 corresponding to the load applied to the corresponding part of the bed 30 are output as output values for each detection period. That is, the first load detection means 1a outputs a load value W1 corresponding to the load applied to the right end of the head of the bed 30 (this is referred to as “first load value W1”) as a first output value for each detection cycle. Is done. From the second load detection means 1b, a load value W2 corresponding to a load applied to the left end of the head side of the bed 30 (this is referred to as “second load value W2”) is output as a second output value for each detection cycle. . From the third load detection means 1c, a load value W3 corresponding to the load applied to the right end of the foot 30 of the bed 30 (this is referred to as “third load value W3”) is output as a third output value for each detection period. . From the fourth load detection means 1d, a load value W4 corresponding to a load applied to the left end of the foot 30 of the bed 30 (this is referred to as “fourth load value W4”) is output as a fourth output value for each detection cycle. .

  Although the detection cycle of each load detection means 1a-1d is not limited, It is desirable to set in the range of 0.005-1s. In the present embodiment, the detection cycle is set to 0.5 s or 1 s, for example.

  The load values W1 to W4 output from the load detection means 1a to 1d are transmitted from the load detection means to the computing unit 2 via a predetermined communication network (for example, LAN, Internet) at each detection cycle. The detection device 20 is configured to be transmitted via or not. Therefore, each load detection means 1a-1d is provided with the transmission means (not shown) which transmits a load value. In this embodiment, transmission of the load value from each load detection means 1a-1d to the calculator 2 is performed by radio.

  The computing unit 2 is a computer (eg, personal computer, tablet computer) having a CPU, RAM, ROM, storage medium (eg, SSD, HDD, SD memory card), display (eg, touch panel display), communication module, speaker, and the like. , Smartphones). The computer is preinstalled with a program for executing calculations, determinations, storage, control, and the like necessary for detecting the presence of the user U on the bed 30.

  As shown in FIG. 3, the computing unit 2 includes an area setting unit 15, an in-situ state detection unit 3, and the like.

  As shown in FIG. 2, the area setting means 15 sets the bed 30 (specifically, the bed surface of the bed 30) into a bed area (indicated by cross hatching) 30A and a seating area (indicated by dot hatching) 30B. Is. The bed area 30A and the seating area 30B set by the area setting means 15 are stored in predetermined storage means (not shown) using XY coordinates of the bed 30 described later.

  The bed area 30A of the bed 30 is an area where the center of gravity G of the user U normally exists when the user U on the bed 30 is in a sleeping position (eg, lying down) for sleeping. It is set near the center of the bed 30. Specifically, the bed area 30A is, for example, a rectangular area of 190 mm from the center position of the bed 30 on both the left and right sides, 200 mm on the foot side, and 500 mm on the head side.

  The seating area 30 </ b> B of the bed 30 includes all areas other than the bed area 30 </ b> A in the bed 30. Accordingly, the seating region 30B generally includes the end of the bed 30. The seating area 30B is an area where the user U who is present on the bed 30 leaves the bed 30 in a relatively short time compared to the case where the user U is present on the bed 30 for sleeping. The person takes a sitting posture exclusively.

  The occupancy status detection means 3 detects the occupancy status of the user U on the bed 30 based on the four load values (output values) W1 to W4 output from the four load detection means 1a to 1d. Yes, it includes a center-of-gravity position calculation means 4, a center-of-gravity position determination means 5, a standing state determination means 6, a bed leaving relation determination means 9, a bed rest history determination means 13, a seating history determination means 14, and the like.

  In this embodiment, unless otherwise specified, the load value (output value) used for detection (determination, calculation, etc.) by the occupancy status detection means 3 is determined by a predetermined tare processing means (not shown). It is assumed that a value obtained by subtracting the weight of the bed 30 when the user U is not on the bed 30 as a tare value, that is, a value obtained by taring. The tare processing means is generally mounted on the calculator 2.

  The gravity center position calculation means 4 calculates the gravity center position G (GX, GY) of the user U on the bed 30 based on the four load values W1 to W4.

  The center-of-gravity position determination means 5 is configured such that the center-of-gravity position G (GX, GY) of the user U on the bed 30 calculated by the center-of-gravity position calculation means 4 is the bed area 30A of the bed 30 preset by the area setting means 15 and It is determined which of the seating areas 30B is present.

  The gravity center position G (GX, GY) of the user U on the bed 30 is calculated by the gravity center position calculation means 4 according to the following equations (1X) and (1Y), for example. Note that O (0, 0) in FIG. 2 indicates the origin of XY coordinates (specifically, XY orthogonal coordinates) that define the center of gravity G (GX, GY) of the user U on the bed 30. ing. The X-axis direction is set to the length direction of the bed 30, and the positive direction (+ direction) of the X-axis is set from the origin O to the head side of the bed 30. The Y axis direction is set in the width direction of the bed 30 (that is, the left and right direction of the bed 30), and the positive direction (+ direction) of the Y axis is set in the right direction of the bed 30. The origin of the X axis is set at an intermediate position between legs in the length direction of the bed 30, and the origin of the Y axis is set at an intermediate position between legs in the width direction of the bed 30.

GX = (W1 + W2-W3-W4) × (1 / WT) × (BX / 2) Equation (1X)
GY = (W1 + W3-W2-W4) × (1 / WT) × (BY / 2) Formula (1Y).

  However, “BX” indicates the leg interval in the length direction (ie, X-axis direction) of the bed 30, and “BY” indicates the leg interval in the width direction (ie, Y-axis direction) of the bed 30. ”And“ BY ”are stored in advance in predetermined storage means (not shown). “WT” is a total load value obtained by summing the four load values W1 to W4 output from the four load detection units 1a to 1d, that is, WT = W1 + W2 + W3 + W4.

  Based on the four load values W1 to W4, the occupancy state determination unit 6 determines whether the user U is in the lying state as the occupancy state of the user U on the bed 30 based on the four load values W1 to W4. It is to determine whether or not it is in a state. More specifically, the occupancy state determination means 6 is a total load value determination means (first total load value determination) for determining whether or not the total load value WT obtained by adding up the four load values W1 to W4 is equal to or greater than a predetermined threshold value. And when the total load value determination means (7a, 8a) determines that the total load value WT is equal to or greater than a predetermined threshold, the center of gravity position G (GX, GY) In accordance with the areas 30A and 30B of the bed 30 where the user exists, it is determined whether the user U is in the bedded state or in the seated state. The seating state includes the end sitting state shown in FIG.

  More specifically, the occupancy state determination unit 6 includes a occupancy state determination unit 7, a sitting state determination unit 8, and the like.

  When the center of gravity position determination unit 5 determines that the center of gravity position G (GX, GY) is present in the bed region 30A of the bed 30, the bed state determination unit 7 determines that the user U is on the basis of the four load values W1 to W4. It is judged whether it is in a state.

  Specifically, the bed state determination means 7 includes first total load value determination means (first total output value determination means) 7a for determining whether or not the total load value WT is equal to or greater than a first threshold value α as a predetermined threshold value. If the first total load value determination means 7a determines that the total load value WT is greater than or equal to the first threshold value α, the total load value WT is greater than or equal to the first threshold value α. First duration determination means 7b for determining whether or not the duration of a certain state is equal to or greater than the third threshold t1 is further included. Further, the first total load value determination means 7a determines that the total load value WT is the first. When it is determined that the value is greater than or equal to the threshold value α, the variation amount determination means 7c is configured to determine whether or not the variation amount of each load value W1 to W4 within a predetermined time is within a predetermined range ± γ. The bed state determining means 7 determines that the duration is equal to or greater than the third threshold t1 by the first duration determining means 7b, and the variation amounts of the load values W1 to W4 are all predetermined by the variation amount determining means 7c. When it is determined that it is within the range ± γ, it is determined that the user U is in the bedded state.

  Note that the case where the variation amount of each load value W1 to W4 is within the predetermined range ± γ in the variation amount determination means 7c means that the movement of the user U on the bed 30 is small and stable. ing.

  In the fluctuation amount determination means 7c, it is desirable that the predetermined time is set within a range of 1 to 600 s. Moreover, in this embodiment, the variation rate within the predetermined time of each load value W1-W4 is employ | adopted as the variation | change_quantity within the predetermined time of each load value W1-W4.

  When the gravity center position determination means 5 determines that the gravity center position G (GX, GY) exists in the seating region 30B of the bed 30, the seating state determination means 8 seats the user U based on the four load values W1 to W4. It is judged whether it is in a state.

  Specifically, the seating state determination unit 8 includes a second total load value determination unit (second total output value determination unit) 8a that determines whether or not the total load value WT is equal to or greater than a second threshold value β as a predetermined threshold value. If the second total load value determining means 8a determines that the total load value WT is greater than or equal to the second threshold value β, the total load value WT is greater than or equal to the second threshold value β. A second duration determination unit 8b that determines whether the duration of a certain state is equal to or greater than the fourth threshold value t2 is provided. Then, the sitting state determination unit 8 determines that the user U is in the sitting state when the second duration determination unit 8b determines that the duration is equal to or greater than the fourth threshold value t2.

  The first threshold value α is larger than 0 (that is, 0 <α) and is set within a range of 1 to 100 kgf to ensure whether or not the user U on the bed 30 is in a bedded state. It is desirable in that it can be determined.

  The second threshold value β is larger than 0 (that is, 0 <β) and is set within a range of 1 to 100 kgf to ensure whether or not the user U on the bed 30 is seated. It is desirable in that it can be determined.

  However, the first threshold value α and the second threshold value β are different (i.e., α ≠ β), so that it is possible to reliably determine the lying state and the sitting state. Furthermore, it is particularly desirable that the second threshold value β is set to be smaller than the first threshold value α (that is, β <α) in that it is possible to more reliably determine the lying state and the sitting state.

  The third threshold value t1 is larger than 0 (0 <t1) and set within a range of 1 s to 10 min, so that it is reliably determined whether or not the user U on the bed 30 is in a bedded state. The point to get is desirable.

  The fourth threshold value t2 is larger than 0 (0 <t2) and is set within the range of 1 s to 10 min to reliably determine whether or not the user U on the bed 30 is in the sitting state. Desirable in terms of obtaining.

  However, the third threshold value t1 and the fourth threshold value t2 are different (i.e., t1 ≠ t2), so that the bed rest state and the seating state can be reliably determined. Furthermore, it is particularly desirable that the fourth threshold value t2 is set to be larger than the third threshold value t1 (that is, t2> t1) in that it is possible to more reliably determine the lying state and the sitting state.

  The predetermined range ± γ is not 0 (that is, γ ≠ 0) and is set within a range of ± 1 to 50% to ensure whether or not the user U on the bed 30 is in a bedded state. It is desirable in that it can be judged.

  The bed leaving determination means 9 determines whether or not the user U on the bed 30 has performed an operation related to getting out of bed based on the four load values W1 to W4 after the execution of the bed presence determination means 6. And a first getting-off relation determining means 10, a second getting-off relation determining means 11 and the like.

  When the first bed leaving determination unit 10 determines that the user U is in the bedded state by the bedside state determining unit 7, has the user U performed an operation related to bed leaving based on the four load values W1 to W4? A bed leaving preliminary action judging means 10a, a first bed leaving judging means 10b, a first bed leaving related alarm means 10c, and the like.

  Examples of the operation related to getting out of bed (hereinafter also referred to as “being out of bed”) include a leaving operation and a leaving operation (that is, an operation in which the user U leaves the bed).

  Based on the four load values W1 to W4, the bed leaving preliminary operation determining means 10a determines whether or not the user U has performed a bed leaving preliminary operation as one operation related to bed leaving.

  As the bed leaving preliminary operation, an operation in which the user U starts moving, an operation in which the user U rises (that is, a back raising operation), an operation in which the user U moves to the end of the bed 30 and gets up, and the user U gets up. There may be at least one operation selected from the group consisting of operations that move to the end of the bed 30.

  The determination method of the preliminary bed leaving motion determination unit 10a when the preliminary bed leaving motion is an operation in which the user U starts moving is, for example, as follows.

  That is, the determination method determines whether or not the amount of movement of the center of gravity G (GX, GY) of the user U on the bed 30 within a predetermined time (for example, 2 s) is greater than or equal to a predetermined threshold. If it is determined that the user U has started to move when it is determined to be greater than or equal to a predetermined threshold, and if the user U has not performed an operation to move when it is determined that the amount of movement is not equal to or greater than the predetermined threshold It is a method of determination. The predetermined threshold is set within a range of 5 to 10 cm, for example.

  For example, the determination method of the preliminary bed removal operation determination unit 10a in the case where the preliminary bed removal operation is an operation in which the user U gets up is as follows.

  That is, the method is that the head side load value at the current time with respect to the head side load value W1 + W2 obtained by adding up the first load value W1 and the second load value W2 before a predetermined time (for example, 5 seconds) from the current time (that is, the current time). When it is determined whether or not the condition that the rate of decrease in the value is greater than or equal to a predetermined threshold (for example, 20%) is satisfied for a predetermined time (for example, 2 seconds) or more, and is satisfied It is determined that the user U has performed a back-up operation, and on the other hand, when it is determined that the user U is not satisfied, the user U determines that the user U has not been awakening (hereinafter also referred to as a “rise determination method”). is there.

  For example, the determination method of the preliminary bed removal operation determination unit 10a in the case where the preliminary bed removal operation is an operation in which the user U moves to the end of the bed 30 and gets up is as follows.

  That is, the determination method determines whether or not the center of gravity G (GX, GY) of the user U on the bed 30 has moved from the bed area 30A of the bed 30 to the end of the bed 30, and the center of gravity position G When it is determined that (GX, GY) has moved from the bed area 30A of the bed 30 to the end of the bed 30, it is determined according to the above-described rising determination method whether or not the user U has moved up. When it is determined that the user U has moved up, the user U moves to the end of the bed 30 and determines that the user U has moved up.

  The determination method of the preliminary bed removal operation determination means 10a in the case where the preliminary bed removal operation is an operation in which the user U gets up and moves to the end of the bed 30, for example, is as follows.

  That is, the determination method is to determine whether or not the user U has moved up in accordance with the above-described startup determination method. When it is determined that the user U has moved up, then the user on the bed 30 It is determined whether the center-of-gravity position G (GX, GY) of U has moved from the bed area 30A of the bed 30 to the end of the bed 30, and the center-of-gravity position G (GX, GY) is determined from the bed area 30A of the bed 30. This is a method for determining that the user U has moved up and moved to the end of the bed 30 when it is determined that the user has moved to the end of the bed 30.

  When the first bed leaving determination means 10b determines that the user U has performed a bed leaving preliminary movement by the bed leaving preliminary movement determination means 10a, another one related to the user U leaving the bed based on the four load values W1 to W4. It is determined whether or not a bed leaving operation is performed as one operation.

  The determination method of the 1st bed determination means 10b is as follows, for example.

  That is, the determination method is that the current total load value WT is the total load value WT0 obtained by adding up the four load values W1 to W4 when the user U determines that the user U is in the bed state. When it is determined whether or not the current total load value WT is less than the predetermined threshold, it is determined whether or not the current total load value WT is less than the predetermined threshold (that is, the user U leaves the floor). On the other hand, when it is determined that the current total load value WT is not less than the predetermined threshold value, it is determined that the user U is not performing the floor leaving operation (that is, the user U is not leaving the floor). Is.

  The first bed-related alarm means 10c issues a first bed-related alarm when it is determined that the user U has performed an operation related to bed removal. More specifically, when the first bed leaving alarm means 10c determines that the user U has made a bed leaving preliminary action by the bed leaving preliminary action judging means 10a, the bed leaving preliminary action alarm is one of the first bed leaving related alarms. When the user U determines that he / she has left the bed by the first bed leaving determination means 10b, the first bed leaving alarm is issued as another alarm among the first bed related alarms.

  The bed leaving preliminary operation alarm and the first bed leaving alarm are different, and specifically, the types of both alarms are different.

  Note that the first bed-related alarm (that is, the bed leaving preliminary operation alarm and the first bed leaving alarm) issued by the first bed-related alarm means 10c is automatically stopped after a predetermined time has elapsed, or a predetermined stop button is used for the care. It is configured to be stopped by being pushed by a person or the like.

  If the second leaving relation determining means 11 determines that the user U is in the sitting state by the sitting state determining means 8, has the user U performed an action related to getting out of the floor based on the four load values W1 to W4? It has a second bed leaving determination means 11b, a second bed leaving alarm means 11c, and the like.

  Based on the four load values W1 to W4, the second bed leaving determination means 11b determines whether or not the user U has made a bed moving operation as an operation related to the bed leaving.

  The determination method of the second getting-off determination means 11b is the same as the determination method of the first getting-off determination means 10b described above, for example.

  When it is determined that the user U has performed an operation related to getting out of bed, the second getting out related alarm means 11c issues a second bed leaving related alarm. More specifically, the second getting-off alarm means 11c is configured to issue a second getting-off alarm as the second getting-off alarm when the second getting-off determination means 11b determines that the user U has made a getting-off operation. Yes.

  The first bed-related alarm and the second bed-related alarm are different, and specifically, the types of the alarms are different. Therefore, the bed leaving preliminary operation alarm, the first bed leaving alarm, and the second bed leaving alarm are different from each other.

  The second bed related alarm (that is, the second bed alarm) issued by the second bed related alarm means 11c is automatically stopped after a predetermined time has elapsed, or a predetermined stop button is pressed by a caregiver or the like. Is configured to be stopped.

  Whether the user U has determined that the user U is in the bed state in the past (that is, from when the bed condition detection unit 3 was started until the current time), the bed history determination unit 13 This is a judgment.

  Whether the seating history determination unit 14 has determined that the user U is in the seating state by the seating state determination unit 8 in the past (that is, from when the occupancy state detection unit 3 is started to the current time). This is a judgment.

  Furthermore, the presence-at-home state detection means 3 determines that the user U is getting out of bed when the first leaving bed-related determining means 10 determines that the user U is not performing an action related to getting out of bed. In each of the cases where it is determined that the operation related to is not performed, the occupancy state detection means 3 is configured to be re-executed.

  Furthermore, when the occupancy status detection unit 3 re-executes the occupancy status detection unit 3, the occupancy status determination unit 13 has determined in the past that the user U is in the occupancy state by the occupancy status determination unit 13. If it is determined that the center of gravity position G (GX, GY) is present in the seating area 30B of the bed 30, the center-of-gravity position determination unit 5 does not execute the seating state determination unit 8, and The determination unit 10 is configured to be executed.

  Furthermore, when the occupancy status detection unit 3 re-executes the occupancy status detection unit 3, the occupancy status determination unit 13 has determined in the past that the user U is in the occupancy state by the occupancy status determination unit 13. If it is determined that the center of gravity position G (GX, GY) is present in the bed area 30A of the bed 30, the center-of-gravity position determination unit 5 does not execute the bed state determination unit 7 and the first bed-related The determination unit 10 is configured to be executed.

  Further, when the presence status detection means 3 re-executes the presence status detection means 3, the seating history determination means 14 has determined in the past that the user U has been in the seated state by the seating status determination means 8. If it is determined that the center of gravity position G (GX, GY) is present in the seating area 30B of the bed 30, the center-of-gravity position determination unit 5 does not execute the seating state determination unit 8, and The determination unit 11 is configured to be executed.

  Next, a bed state detection method for the bed 30 using the detection device 20 of the present embodiment will be described below with reference to FIGS.

  First, the bed 30 is set in advance as a bed area 30A and a seating area 30B by the area setting means 15, and both areas 30A and 30B are stored in a predetermined storage means.

  As shown in FIG. 4, in step S <b> 1, loads applied to the head-side right end, the head-side left end, the foot-side right end, and the foot-side left end of the bed 30 are respectively calculated by the first to fourth load detection units 1 a to 1 d. Detection is started every predetermined detection period [load detection step]. Then, by starting the occupancy status detection means 3, the occupancy status detection step S10 is started.

  In step S2, when the user U is on the bed 30, the gravity center position G (GX, GY) of the user U on the bed 30 is calculated by the gravity center position calculation means 4, and the calculated gravity center position G ( The center-of-gravity position determination unit 5 determines whether GX, GY) exists in the bed area 30A of the bed 30 or the seating area 30B of the bed 30 preset by the area setting unit 15 [center-of-gravity position determination step]. If it is determined that the center of gravity position G (GX, GY) exists in the bed area 30A, the process proceeds to step S3. On the other hand, if it is determined that the gravity center position G (GX, GY) is present in the seating region 30B, the process proceeds to step S6.

  In step S3, the bed history determination unit 13 determines whether or not the user U has been determined to be in the bed state in the past by the bed state determination unit 7 [bed bed history determination step]. If it is determined that it has been determined that the bed is in the past (in the case of “YES”), the process proceeds to step S5 without executing step S4 (determination of the bed state). On the other hand, when it is determined that it has not been determined that the bed is in the past (in the case of “NO”), the process proceeds to step S4.

  In step S4, based on the four load values W1 to W4, whether or not the user U is in the bed state is determined by the bed state determination means 7 [bed bed state determination step]. Specifically, this determination is performed as follows.

  That is, as shown in FIG. 5, in step S11, it is determined whether or not the total load value WT obtained by adding up the four load values W1 to W4 is equal to or greater than a first threshold value α (for example, 20 kgf). Judge by 7a. When it is determined that the total load value WT is equal to or greater than the first threshold value α (“YES”), the process proceeds to step S12. On the other hand, when it is determined that the total load value WT is not equal to or greater than the first threshold value α (in the case of “NO”), the process returns to step S2, that is, the occupancy state detection step S10 is performed again.

  In step S12, the first duration determination unit 7b determines whether or not the duration of the state in which the total load value WT is equal to or greater than the first threshold value α is equal to or greater than a third threshold t1 (for example, 10s), and each load Whether or not the fluctuation amount (the fluctuation rate within a predetermined time of each load value W1 to W4) within a predetermined time (for example, 10 s) of the values W1 to W4 is within a predetermined range ± γ (for example, ± 10%). Is determined by the variation amount determination means 7c [first duration determination step and variation amount determination step]. When it is determined that the duration is equal to or greater than the third threshold t1 and the variation amounts of the load values W1 to W4 are all within the predetermined range ± γ (in the case of “YES”), the process proceeds to step S13. It determines with it being a bedrock state, and progresses to step S5. On the other hand, at least one of a case where it is determined that the duration is not equal to or greater than the third threshold t1, and a case where it is determined that at least one of the fluctuation amounts of the four load values W1 to W4 is not within the predetermined range ± γ. If this is the case ("NO"), the process returns to step S2, that is, the occupancy status detection step S10 is re-executed.

  As shown in FIG. 4, in step S <b> 5, the first bed leaving determination unit 10 determines whether or not the user U has performed an operation related to bed leaving based on the four load values W <b> 1 to W <b> 4 [first bed leaving]. Association determination step]. Specifically, this determination is performed as follows.

  That is, as shown in FIG. 7, in step S31, the bed leaving preliminary operation determining means 10a determines whether or not the user U on the bed 30 has performed a bed leaving preliminary operation as one of the operations related to bed leaving [ Step of preliminary operation for getting out of bed]. The user U moves out as a preliminary leaving operation, the user U starts to move, the user U gets up (ie, the back-up operation), the user U moves to the end of the bed 30 and gets up, and the user U When it is determined that at least one operation selected from the group consisting of the operation of getting up and moving to the end of the bed 30 has been performed (in the case of “YES”), the process proceeds to step S32. On the other hand, when it is determined that the user U has not performed all of these operations as the bed leaving preliminary operation (in the case of “NO”), the process returns to step S2, that is, the occupancy status detection step S10 is performed again.

  In step S32, a bed leaving preliminary operation alarm is issued by the first bed leaving alarm means 10c, and the process proceeds to step S33.

  In step S33, it is determined by the first bed leaving determination means 10b whether or not the user U has performed a bed leaving movement (that is, the user U has left the bed). When it is determined that the user U has performed a bed leaving operation (in the case of “YES”), the process proceeds to step S34 and a first bed leaving alarm is generated by the first bed leaving alarm means 10c. On the other hand, when it is determined that the user U is not moving away from the floor (in the case of “NO”), the process returns to step S2, that is, the occupancy status detection step S10 is performed again.

  As shown in FIG. 4, in step S <b> 6, the seating history determination unit 14 determines whether or not the user U has been determined to be seated in the past by the seating state determination unit 8 [sitting history determination step. ]. If it is determined that the seating state has been determined in the past ("YES"), the process proceeds to step S9 without executing step S7 (bed bed history determination) and step S8 (sitting state determination). On the other hand, if it is determined that the seating state has not been determined in the past (in the case of “NO”), the process proceeds to step S7.

  In step S7, it is determined by the bed history determination unit 13 whether or not the user U has been determined to be in the bed state in the past by the bed state determination unit 7 [bed bed history determination step]. When it is determined that it has been determined that the bed is in the past (in the case of “YES”), the process proceeds to step S5. On the other hand, if it is determined that it has not been determined that the bed is in the past (in the case of “NO”), the process proceeds to step S8.

  In step S8, based on the four load values W1 to W4, whether or not the user U is in the seating state is determined by the seating state determination means 8 [sitting state determination step]. Specifically, this determination is performed as follows.

  That is, as shown in FIG. 6, in step S21, it is determined whether or not the total load value WT obtained by adding up the four load values W1 to W4 is equal to or greater than a second threshold value β (for example, 10 kgf). Judge by 8a. When it is determined that the total load value WT is equal to or greater than the second threshold value β (in the case of “YES”), the process proceeds to step S22. On the other hand, when it is determined that the total load value WT is not equal to or greater than the second threshold value β (in the case of “NO”), the process returns to step S2, that is, the occupancy status detection step S10 is performed again.

  In step S22, the second duration determination unit 8b determines whether or not the duration of the state where the total load value WT is equal to or greater than the second threshold β is equal to or greater than a fourth threshold t2 (for example, 60 s) [second continuation]. Time determination step]. When it is determined that the duration is equal to or greater than the fourth threshold value t2 (in the case of “YES”), the process proceeds to step S23, where it is determined that the bed is in the bed state, and the process proceeds to step S9. On the other hand, when it is determined that the duration is not equal to or greater than the fourth threshold value t2 (in the case of “NO”), the process returns to step S2, that is, the occupancy status detection step S10 is performed again.

  As shown in FIG. 4, in step S <b> 9, whether or not the user U has performed an operation related to getting out of the floor based on the four load values W <b> 1 to W <b> 4 is determined by the second getting-off related determining means 11 [second getting out of bed] Association determination step]. Specifically, this determination is performed as follows.

  That is, as shown in FIG. 8, in step S41, it is determined whether or not the user U on the bed 30 has performed a bed leaving operation as an operation related to bed leaving (that is, the user U has left the bed). Judgment by When it is determined that the user U has performed a bed leaving operation (in the case of “YES”), the process proceeds to step S42 and a second bed leaving alarm is generated by the second bed leaving alarm means 11c. On the other hand, when it is determined that the user U is not moving away from the floor (in the case of “NO”), the process returns to step S2, that is, the occupancy status detection step S10 is performed again.

  The detection device 20 of the present embodiment has the following advantages.

  According to the detection device 20, the user U is in the bedded state according to the areas 30 </ b> A and 30 </ b> B of the bed 30 where the gravity center position G (GX, GY) of the user U on the bed 30 exists by the bed-state determination unit 6. Or whether it is in a seated state. Here, the area of the bed 30 is set by the area setting means 15 to the bed area 30A and the seating area 30B composed of areas other than the bed area 30A. GX, GY) always exists in either one of the bed area 30A and the seating area 30B of the bed 30. Therefore, it is possible to reliably detect the user U's presence on the bed 30.

  Further, the first threshold value α for determining that the user U is in the bedded state by the first total load value determining unit 7a of the bedside determining unit 7 and the second total load value determining unit 8a of the seating state determining unit 8. Since the second threshold value β for determining that the user U is in the seated state is different, the bedded state and the seated state can be reliably determined.

  Further, when the bed state determining means 7 determines that the duration of the state in which the total load value WT is equal to or greater than the first threshold value α is equal to or greater than the third threshold value t1, the user U is determined to be in the bedded state. The bed state can be determined more reliably.

  The sitting state determination means 8 determines that the user U is in the sitting state when it is determined that the duration of the state where the total load value WT is equal to or greater than the second threshold β value is equal to or greater than the fourth threshold t2. Therefore, the seating state can be determined more reliably.

  In addition, since the third threshold value t1 and the fourth threshold value t2 are different, it is possible to more reliably determine the bedded state and the seated state.

  Further, when the bed state determining means 7 determines that the duration is equal to or greater than the third threshold value t1 and determines that the fluctuation amount of each load value W1 to W4 is within the predetermined range ± γ, Since it determines with it being in a state, it can determine more reliably the bed state.

  Further, the bed leaving determination means 9 is a separate determination means (first bed related determination means 10, second bed removal related determination) corresponding to each of the case where the user U is in the bedded state and the case of the bedded state. Since the means 11) is provided, it is possible to perform the bed-related determination under the determination conditions suitable for each case. Thereby, in each case, it can be determined reliably whether the user U performed the operation | movement relevant to getting out of bed.

  In addition, since the first bed-related alarm issued by the first bed-related alarm means 10c and the second bed-related alarm issued by the second bed-related alarm means 11c are different, a caregiver for the user U, etc. Can determine from which region the user U has performed an action related to getting out of bed, according to the type of alarm that has been issued.

  In addition, since the first bed leaving determination unit 10 includes the bed leaving preliminary operation determination unit 10a and the first bed leaving determination unit 10b, has the bed U user performed the bed leaving preliminary operation as an operation related to bed leaving? It is possible to determine whether or not the bed leaving operation has been performed.

  Further, when the user U determines that the preliminary movement is determined by the preliminary bed movement determination unit 10a, the preliminary movement alarm that is issued when the user U performs the preliminary movement operation, and when the first user determines that the user U has performed the vertical movement operation by the first bed determination unit 10b. This is different from the first bed alarm that is issued to the user, so that caregivers to the user U can determine whether the user U has performed a bed leaving operation or a bed leaving operation depending on the type of alarm issued. Judgment can be made.

  Moreover, since the 2nd bed leaving determination means 11 has the 2nd bed leaving determination means 11b, it can be determined whether the user U of the sitting state performed the bed leaving operation as the operation related to the bed leaving. .

  In addition, the presence status detection unit 3 determines that the user U is getting out of bed when the first U-bed determining unit 10 determines that the user U is not performing an operation related to getting out of bed. In each of the cases where it is determined that the operation related to is not performed, the occupancy state detection means 3 is configured to be re-executed. Therefore, even when the center of gravity G (GX, GY) of the user U on the bed 30 first exists in the seating area 30B of the bed 30 and the seating state determination means 8 determines that the user U is in the seating state. Then, when the gravity center position G (GX, GY) of the user U on the bed 30 moves to the bed area 30A of the bed 30, the bed state determination means 7 determines that the user U is in the bed state. Can do.

  Further, when the occupancy status detection means 3 is re-executed, the occupancy status detection means 3 is a case where the user U has determined in the past that the user U is in the declining state. If the center-of-gravity position determination unit 5 determines that the center-of-gravity position G (GX, GY) is present in the seating area 30B of the bed 30, the first bed-related determination unit 10 is executed without executing the seating state determination unit 8. Has been. Therefore, if the user U has determined in the past that the user U is in the bed state, then the center of gravity G (GX, GY) of the user U on the bed 30 is the bed 30. Even if the user moves to the seating area 30B, whether or not the user U has performed an operation related to getting out of bed by the first getting-out related determining means 10 instead of the second getting-out related determining means 11 without executing the sitting state determining means 8. Is determined. Thereby, in the case where it has been determined that the user U is in the bedded state in the past, it is possible to reliably determine the operation related to the user U getting out of bed.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

  In the said embodiment, the load values W1-W4 are used as an output value output from each load detection means 1a-1d. However, in the present invention, the output value output from each of the load detecting means 1a to 1d is not limited to the load value, and for example, a voltage corresponding to the load applied to the corresponding portion of the bed 30 It may be a value. In this case, the load value can be calculated by converting the voltage value according to a predetermined conversion formula, and load value calculation means (including the voltage signal amplification unit and the A / D conversion unit) for performing the calculation is, for example, a calculation The device 2 is provided.

  In the present invention, the load value (output value) used for detection (determination, calculation) by the occupancy status detection means 3 is a value obtained by subtracting the weight of the bed 30 as the tare value as in this embodiment, that is, Although it is particularly desirable that a value subjected to a tare process can be accurately detected, the present invention is not limited to this, and the load value (output value) is a value not subjected to a tare process. Is not to be excluded.

  INDUSTRIAL APPLICABILITY The present invention can be used for a bed occupancy status detection device and a bed occupancy status detection method for detecting the occupancy status of a bed user who is present on the bed.

1a to 1d: first to fourth load detection means 3: occupancy status detection means 5: center-of-gravity position determination means 6: occupancy state determination means 7: occupancy state determination means 7a: first total load value determination means (first Total output value judging means)
7b: First duration determination means 7c: Fluctuation amount determination means 8: Seating state determination means 8a: Second total load value determination means (second total output value determination means)
8b: second duration determination means 9: getting-off related determining means 10: first getting-off related determining means 10a: getting-off preliminary operation determining means 10b: first getting-off determining means 10c: first getting-off related alarm means 11: second getting-off related Determination means 11b: Second bed leaving determination means 11c: Second bed leaving alarm means 15: Area setting means 20: Bed occupancy status detection device 30: Bed 30A: Bed bed area 30B: Bed seating area

Claims (11)

An area setting means for setting the bed to a bed area where the position of the center of gravity of the user exists when the user on the bed is in a sleeping position and a seating area including an area other than the bed area;
A plurality of load detecting means for detecting a load applied to each of a plurality of spaced apart portions of the bed for each predetermined detection period;
Occupancy status detection means for detecting the occupancy status of the user on the bed based on a plurality of output values output from the plurality of load detection means,
The presence status detecting means includes
Center-of-gravity position determination means for determining whether the center-of-gravity position of the user on the bed calculated based on the plurality of output values exists in the bed area or the seating area set by the area setting means When,
A stagnation state determination unit that determines whether the user is in a lying state or a sitting state as a stagnation state of the user on the bed based on the plurality of output values after execution of the gravity center position determination unit; , And
The occupancy state determination unit includes a total output value determination unit that determines whether or not a total output value obtained by summing the plurality of output values is equal to or greater than a predetermined threshold, and the total output value determination unit includes the total output value determination unit. When the output value is determined to be greater than or equal to the predetermined threshold, the bed occupancy status detection device determines whether the user is in a bedded state or a seated state in accordance with the bed region where the center of gravity exists. . The presence state determining means includes
When it is determined by the barycentric position determining unit that the barycentric position is present in the bed area, the bed state determining unit that determines whether the user is in the bed state based on the plurality of output values;
A seating state determining unit that determines whether the user is in a seated state based on the plurality of output values when the center of gravity position determining unit determines that the center of gravity position is present in the seating region; And
The bed state determination means includes, as the total output value determination means, first total output value determination means for determining whether or not the total output value is equal to or greater than a first threshold value α as the predetermined threshold. If the total output value determining means determines that the total output value is greater than or equal to the first threshold value α, it is determined that the user is in a bedridden state,
The seating state determination means includes second total output value determination means for determining whether or not the total output value is equal to or greater than a second threshold value β different from the first threshold value α as the predetermined threshold value. 2. The apparatus according to claim 1, wherein the user is determined to be seated when the second total output value determination unit determines that the total output value is equal to or greater than the second threshold value β. Bed presence detection device for bed. The bed state determining means continues the state in which the total output value is equal to or greater than the first threshold value α when the first total output value determining means determines that the total output value is equal to or greater than the first threshold value α. When having first duration determination means for determining whether or not the time is equal to or greater than a third threshold t1, and determining that the duration is equal to or greater than the third threshold t1 by the first duration determination means, It is determined that the user is in bed,
The seating state determination unit continues the state in which the total output value is equal to or greater than the second threshold value β when the second total output value determination unit determines that the total output value is equal to or greater than the second threshold value β. The second duration determination unit determines whether or not the time is equal to or greater than a fourth threshold t2 different from the third threshold t1, and the second duration determination unit includes the second duration determination unit. The bed occupancy status detection apparatus according to claim 2, wherein when it is determined that the threshold value is equal to or greater than the threshold t2, the user is determined to be in a sitting state.   When the bed state determining means determines that the total output value is greater than or equal to the first threshold value α by the first total output value determining means, the variation amount of each output value per predetermined time is within a predetermined range ± γ. Variation amount determination means for determining whether or not the output is within the range, the first duration determination means determines that the duration is equal to or greater than the third threshold value t1, and the variation amount determination means determines each output. 4. The bed occupancy status detection device according to claim 3, wherein when the value fluctuation amount is determined to be within the predetermined range ± γ, the user is determined to be in a bedded state. The presence status detecting means includes
After the execution of the occupancy state determination means, it comprises a bed-related determination means for determining whether or not the user has performed an operation related to bed leaving,
The bed leaving relation determining means includes
A first bed-related determination unit that determines whether the user has performed an operation related to getting out of bed based on the plurality of output values when the bed state determining unit determines that the user is in the bed state; ,
A second getting-off determining unit that determines whether or not the user has performed an operation related to getting out of the bed based on the plurality of output values when the sitting-up state determining unit determines that the user is in the sitting state; The bed occupancy state detection device according to any one of claims 2 to 4, further comprising: The first bed-related determination means includes first bed-related alarm means for issuing a first bed-related alarm when it is determined that the user has performed an operation related to bed removal,
The second getting-off function determining means has second getting-off related alarm means for issuing a second getting-off alarm different from the first getting-off alarm when it is determined that the user has performed an action related to getting out of the bed. The bed occupancy status detection device according to claim 5. The first bed leaving relation determining means includes:
Based on the plurality of output values, a bed leaving preliminary operation determining unit that determines whether the user has performed a bed leaving preliminary operation as one operation related to bed leaving;
If it is determined that the user has performed a preliminary bed leaving operation by the preliminary bed leaving operation determining means, it is determined whether or not the user has performed a bed leaving operation as another operation related to the bed leaving based on the plurality of output values. First leaving bed determining means to
The first bed-related alarm means is:
When it is determined that the user has made a pre-move operation by the pre-move operation determining means, a pre-move operation alarm is issued as one of the first bed-related alarms,
When it is determined by the first bed leaving determination means that the user has made a bed leaving operation, a first bed leaving alarm different from the bed leaving preliminary operation alarm is issued as another alarm among the first bed leaving alarms. The bed occupancy state detection device according to claim 6, which is configured as described above. The second bed leaving determination unit has a second bed leaving determination unit that determines whether the user has performed a bed leaving operation as an operation related to bed leaving based on the plurality of output values.
The second getting-off alarm means is configured to issue a second getting-off alarm as the second getting-off alarm when the second getting-off determining means determines that the user has made a getting-off action. The bed presence detection device for bed according to 6 or 7. The presence status detecting means includes
When it is determined that the user does not perform an action related to getting out of bed by the first getting-off related determining means, and when the user determines that the user does not perform an action related to getting out of bed by the second getting-out related determining means In each case, the bed occupancy status detection device according to any one of claims 5 to 8, which is configured to re-execute the occupancy status detection means. The presence status detecting means includes
In the case where the presence status detecting means is re-executed,
In the past, when the user has determined that the user is in the bed state by the bed state determining unit, and when the barycentric position determining unit has determined that the barycentric position exists in the seating region, the seating state determination The bed occupancy status detection apparatus according to claim 9, wherein the bed leaving condition detection unit is configured to execute the first bed leaving relation determination unit without executing the unit. A load detection step of detecting a load applied to each of a plurality of parts separated from each other by a plurality of load detection means corresponding to each part for each predetermined detection period;
A bed condition detection step of detecting a user's bed condition on the bed based on a plurality of output values output from the plurality of load detection means, and
The presence status detection step includes:
The gravity center position of the user on the bed calculated based on the plurality of output values exists in the bed bed area of the preset bed where the gravity center position of the user exists when the user on the bed is in the sleeping position. Or a center-of-gravity position determination step for determining whether or not it exists in a preset seating area consisting of an area other than the bed area of the bed;
After the center-of-gravity position determination step, based on the plurality of output values, a occupancy state determination step of determining whether the user is in a bedded state or a seated state as the occupant state of the user on the bed; , And
The presence state determination step includes a total output value determination step for determining whether or not a total output value obtained by summing the plurality of output values is equal to or greater than a predetermined threshold, and the total output value determination step includes the total output value determination step. When the output value is determined to be equal to or greater than the predetermined threshold value, the bed occupancy state detection method for determining whether the user is in a bedded state or a seated state in accordance with the bed area where the center of gravity exists. .

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