Determination device

Abstract

To provide an air cell control device capable of controlling an air cell properly according to a user.SOLUTION: An air cell control device includes a control unit that performs control of postural change by expanding and contracting a plurality of air cells, wherein the control unit determines a user's state on the air cells, and switches control of one or more air cells among the plurality of air cells based on the user's state.SELECTED DRAWING: Figure 13

Description

Technical Field

[0001] The present disclosure relates to a determination device and the like.

Background Art

[0002] Conventionally, for preventing pressure ulcers of users, there are mattresses provided with a structure for performing position conversion (see, for example, Patent Document 1), and mattresses provided with sub air cells for position conversion (see, for example, Patent Document 2). Conventional sub cells are cylindrical air cells arranged on both sides of the user (for example, shoulders, knees, waist, hips, etc.).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] One object of the present disclosure is to provide an air cell control device capable of appropriately controlling an air cell according to a user.

Means for Solving the Problems

[0005] The air cell control device of the present disclosure is an air cell control device having a control unit that controls position conversion by expanding and contracting a plurality of air cells, wherein the control unit determines the state of a user on the air cell, and based on the state of the user, switches the control of one or more of the plurality of air cells.

[0006] The air mattress of the present disclosure is composed of an air cell including a main cell and a plurality of sub-cells, and is an air mattress provided with a control unit that controls the conversion of the user's body position by expanding and contracting the plurality of sub-cells. The air mattress includes one or more conductive sheets made of a conductive sheet or conductive fibers, a main cell adjacent to the conductive sheet, a measuring unit that measures a change in the capacitance of the conductive sheet due to deformation of the main cell, and a determination unit that determines the position of the user on the air cell from the conversion of the capacitance measured by the measuring unit. The control unit is characterized in that it determines a sub-cell to be switched in control among the sub-cells according to the position of the user determined by the determination unit.

Effect of the Invention

[0007] According to the air cell control device of the present disclosure, it is possible to appropriately control the air cell according to the user.

Brief Description of the Drawings

[0008]

Figure 1

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Figure 13

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Figure 20

Embodiments for Carrying Out the Invention

[0009] Hereinafter, an embodiment for carrying out the present disclosure will be described with reference to the drawings. Note that the following embodiments are examples for explaining the present disclosure, and the technical scope of the invention described in the claims is not limited to the following description.

[0010] Conventionally, there has been a mattress provided with a sub air cell for body position conversion (hereinafter referred to as "sub cell" for the sub air cell for body position conversion) for preventing pressure sores of a user.

[0011] And, for example, the sub-cells are arranged under the mattress and parallel to the longitudinal direction of the mattress. When these sub-cells expand, the mattress positioned above the sub-cells bulges. Then, the mattress and the sub-cells can support the user by receiving the load of the user's body. However, in reality, the portion where the mattress bulges due to the expansion of the sub-cells and the portion that contacts the user's body lying on the mattress are limited locations.

[0012] However, the sub-cells arranged in the mattress for position conversion are basically designed assuming that the user sleeps in the center of the mattress. Therefore, when the user sleeps near the end of the mattress, there is a problem that the pressure dispersion effect is not sufficiently exerted.

[0013] Also, in position conversion using general sub-cells, the control is such that the sub-cells simply repeat expansion and contraction in order. Therefore, depending on the user's posture, there has been a problem that the effect of position conversion by expansion and contraction cannot be appropriately exerted.

[0014] Also, depending on the posture, the contact area between the mattress due to the expansion of the sub-cells and the user decreases, and the part that supports the user's body decreases. As a result, the user's body becomes unstable, muscle tension of the user occurs, and there is a problem that the user cannot rest comfortably. In particular, the muscle tension of the user also causes a new risk of progressing the user's contracture.

[0015] To solve such problems, the mattress and the like will be described based on the following detailed embodiments. Note that the following embodiments are an example of the present disclosure, and the invention is not limited to the content.

[0016] [1. Overall Configuration] FIG. 1 is a diagram schematically illustrating a bed system 1 in the present embodiment. As shown in FIG. 1(a), in the bed system 1, a mattress 10 is placed on a bed body 20 which is a bed device.

[0017] Note that the mattress 10 is an air mattress composed of air cells in this embodiment. The mattress 10 may be, for example, a urethane mattress or a hybrid mattress combining urethane and air cells, in addition to the air mattress. Further, the mattress 10 may be an elastic body used for bedding such as a polyester fiber structure, gel, or spring.

[0018] The bed system 1 is used by the user P. For example, when lying on the bed body 20 (mattress 10), the left side in FIG. 1(a) is the head side and the right side is the foot side. Also, assuming a standard size, when the user P lies on the bed, the user's back is at the position of the back bottom, and the user's waist is at the position of the curved bottom or the waist bottom. Specifically, in the case of a standard user, the position of the greater trochanter is approximately 980 mm from the foot-side end of the mattress 10 (bed body 20).

[0019] Here, the user refers to a person who actually uses the bed device (mattress) among those who use the bed system. For example, the user refers to a patient admitted to a hospital or a facility, a person requiring care, or a person lying on the bed device (mattress) at home.

[0020] Also, in this embodiment, the staff refers to a person who supports the user. For example, the staff includes doctors, nurses in a hospital, care staff in a facility, family members of the user at home, etc.

[0021] Also, in this embodiment, the operator refers to a person who operates the bed system. The operator is mainly staff, but when the user operates, the user is included in the operator.

[0022] As the size of the general bed body 20, assuming a standard user (about 140 to 170 cm in height), the width direction, which is the short side, is 910 mm, and the length direction, which is the long side, is 1910 mm. The size of the bed body is an example for explaining the embodiment. For example, it may be a smaller mini size (the length direction of the bed body is 1800 mm) or a larger long size (for example, the length of the bed body is 2050 mm). Also, if the size of the bed body 20 changes, the position of the user also changes relatively.

[0023] According to the size of the bed body 20 and the mattress 10, the location (position) of the user's body part changes. The position of the user when the size of the bed body 20 (mattress 10) changes can be easily understood by those skilled in the art based on the content of this disclosure.

[0024] Also, the body position of the user in this embodiment includes the position of the user and the posture of the user. The position of the user is the position (sleeping position) on the mattress 10. The posture of the user refers to the posture (sleeping posture) when the user is sleeping on the mattress 10. Also, the body position may include postures when not sleeping, such as sitting upright or sitting cross-legged.

[0025] [2. Configuration of the Bed Body] The configuration of the bed body 20 will be described with reference to FIGS. 1 and 2.

[0026] The bed body 20 includes a bottom 22, an upper frame 24, and a lower frame 26 from top to bottom, and has a lifting mechanism 28 between the upper frame 24 and the lower frame 26.

[0027] As shown in Fig. 1(b), when the user lies on the bed body 20, the bottom 22 has a back section 22a, a curved bottom 22b as a seat section, an upper leg section 22c, and a lower leg section 22d from the head side to the foot side. Here, each bottom of the bottom 22 can be rotated individually or in conjunction with each other.

[0028] Note that the curved bottom 22b is one of the seat sections and can support the user by curving the bottom as the back section 22a rises. Also, the curved bottom 22b may be configured to expand and contract while curving as the back section 22a rises and falls. The curved bottom has been commercialized by the applicant as a Cumera line bottom (Cumera bottom).

[0029] Also, as an example, the length of the back section 22a (the horizontal length in the longitudinal direction of the bed body 20) is about 640 mm, the length of the curved bottom 22b is about 340 mm, the length of the upper leg section 22c is 375 mm, and the length of the lower leg section 22d is about 555 mm.

[0030] For example, a drive device (actuator) is connected to each bottom. The bottom 22 can be rotated by the operation of the drive device. Note that even if the drive device is not connected to each bottom, the bottom 22 can operate a plurality of bottoms with one drive device by using, for example, a link mechanism. Also, the bottom 22 operates in conjunction by connecting adjacent bottoms.

[0031] Also, the bed body 20 can realize movements such as a back raising movement, a knee raising movement, and a foot lowering movement by rotating each bottom. Also, the bed body 20 may link the back raising movement and the knee raising movement (foot lowering movement).

[0032] As shown in Fig. 1(b), the bed body 20 realizes the back-raising operation by rotating and rising with the back bottom 22a centered on the curved bottom 22b side. At this time, the angle α at which the back bottom 22a rises (the angle α at which the back bottom 22a is lifted from the horizontal) is called the back-raising angle α.

[0033] Also, when the back bottom 22a rises, the curved bottom 22b curves in conjunction with the back bottom 22a. By curving, the curved bottom 22b takes a shape that conforms to the user's waist and can support the user. The back bottom 22a and the curved bottom 22b are connected, for example, by their connecting parts.

[0034] In addition, the bed body 20 realizes the knee-raising operation by rotating the knee bottom 22c around the end on the curved bottom 22b side. At this time, the angle β at which the knee bottom 22c rises (the angle β at which the knee bottom 22c is lifted from the horizontal) is called the knee-raising angle β.

[0035] Note that the foot bottom 22d may move in conjunction with the movement of the knee bottom 22c. In this case, the foot-raising angle (foot-lowering angle) may be used instead of the knee-raising angle.

[0036] As shown in Fig. 1(c), the bed body 20 may be constituted by a waist bottom 22e instead of the curved bottom 22b. In this case, as an example, the length of the back bottom 22a is about 785 mm, and the length of the waist bottom 22e is about 195 mm. The waist bottom 22e generally does not rotate and supports the user's waist (hips).

[0037] The bottom 22 is supported by the upper frame 24. The upper frame 24 may have any shape that supports the bottom 22. Also, the lower frame 26 may have any shape that supports the upper frame 24 that supports the bottom 22.

[0038] The elevating mechanism 28 adjusts the height of the upper frame 24 and thereby adjusts the height of the bed body 20. Here, the height of the bed body 20 generally refers to the height (floor height) from the installed surface (the ground surface) to the upper frame 24. Note that the height of the bed body 20 may also be the height from the ground surface to the bottom 22.

[0039] The elevating mechanism 28 is realized, for example, by a link mechanism or a driving device (driving mechanism) using an actuator.

[0040] Figure 2 is a diagram for explaining the operation of the bed body 20. The bed body 20 has a driving part for driving each bottom.

[0041] The back bottom driving part 32 can raise the back bottom 22a. For example, the back bottom driving part 32 is an actuator, and the back bottom 22a is connected to the tip of the rod of the actuator via a link mechanism.

[0042] The knee bottom driving part 34 can raise the knee bottom 22c. For example, the knee bottom driving part 34 is an actuator, and the knee bottom 22c is connected to the tip of the rod of the actuator via a link mechanism.

[0043] Also, each driving part is connected to a drive control part 2000. The drive control part 2000 functions as a bottom control part 2100 that controls the back bottom driving part 32 and the knee bottom driving part 34, and a height control part 2200 that controls the height driving part 36.

[0044] The bottom control part 2100 realizes the back raising function by controlling the back bottom driving part 32 and raises the back bottom 22a. Specifically, the bottom control part 2100 advances the rod of an actuator, which is an example of the back bottom driving part 32. The back bottom driving part 32 applies a driving force to the back bottom 22a via a link mechanism when the rod of the actuator advances. The back bottom 22a rotates with the head side of the back bottom 22a as a fulcrum when the driving force is applied, and the foot side rises.

[0045] At this time, the curved bottom 22b connected to the back bottom 22a also rises accordingly. For example, one end side of the curved bottom 22b is connected to the back bottom 22a, and the other end side is connected to the upper frame 24. Further, the curved bottom 22b can be curved, and the end on the back bottom 22a side may rise while curving as the back bottom 22a rises. Also, the curved bottom 22b may be configured to be stretchable.

[0046] The bottom control unit 2100 realizes the knee-lifting function by controlling the knee bottom driving unit 34 and raises the knee bottom 22c. Specifically, the bottom control unit 2100 extends the rod of an actuator, which is an example of the knee bottom driving unit 34. When the rod of the actuator advances, the knee bottom driving unit 34 applies a driving force to the knee bottom 22c via a link mechanism. When the driving force is applied to the knee bottom 22c, the knee bottom 22c rotates with the curved bottom 22b side of the knee bottom 22c as a fulcrum, and the foot bottom 22d side rises.

[0047] At this time, the foot bottom 22d may rotate in conjunction with the knee bottom 22c. For example, when the foot bottom 22d is connected to the knee bottom 22c via a link mechanism, when the foot bottom 22d side of the knee bottom 22c rises, one end on the knee bottom 22c side of the foot bottom 22d rises. When one end of the foot bottom 22d rises, the other end on the foot side of the bed body 20 descends. At this time, the other end of the foot bottom 22d descends below the upper frame 24, but it may be connected to the upper frame 24.

[0048] Further, the height control unit 2200 realizes the functions of raising and lowering the bed body 20 by controlling the height driving unit 36, and can raise or lower the upper frame 24.

[0049] For example, the height drive unit 36 is provided between the upper frame 24 and the lower frame 26. As an example of the height drive unit 36, one end of an actuator is provided on the lower frame 26. Then, when the rod of the actuator extends, the upper frame 24 is pushed up and lifted via the link mechanism by the height drive unit 36. As a result, the floor height of the bed body 20 increases.

[0050] Note that if the drive control unit 2000 performs control for each drive unit to perform an operation opposite to the above-described operation, the opposite operation will occur. That is, the drive unit performs operations such as a lowering operation, a knee-lowering operation, and a lowering of the floor height by retracting the rod of the actuator.

[0051] [3. Configuration of the Mattress] [3.1 Configuration of the Entire Mattress] The configuration of the mattress 10 will be described. FIG. 3 is an exploded view schematically showing the configuration of the mattress 10.

[0052] The entire mattress 10 is covered with covers (top cover 100 and bottom cover 102). The top cover 100 and the bottom cover 102 are configured to be detachable. Note that the top cover 100 and the bottom cover 102 may be integrally formed.

[0053] Also, inside the cover of the mattress 10, from the upper layer, it includes a top urethane 110, a main cell 120, a sub-cell 130, and a bottom cushion 140.

[0054] The top urethane 110 is placed on the air cell and is configured by, for example, a urethane sheet. Also, a glide sheet 115 is provided between the top urethane 110 and the top cover 100 which is the side fabric. The glide sheet 115 is a material with low frictional resistance and is provided to make the top cover 100 and the top urethane 110 slide easily. Note that the glide sheet 115 may be provided as needed.

[0055] The main cell 120 is composed of an air cell group in which a plurality of air cells are gathered. The main cell 120 is connected to the pump 180 via a blower tube (not shown). The main cell 120 may also be referred to as a main body cell.

[0056] The pump 180 is connected to each air cell. For example, the pump 180 divides the cells constituting the main cell 120 into one or a plurality of systems (groups) and connects the blower tubes. Then, by supplying air from the pump 180 to the main cell 120, the main cell 120 is inflated. Also, by releasing the valve provided between the pump 180 and the main cell 120 or forcibly exhausting air, the main cell 120 can be exhausted and the main cell 120 can be contracted.

[0057] In addition, the pump 180 is also connected to a sub air cell (sub cell) 130. Similar to the above description, the pump 180 can supply air to the sub cell 130 or exhaust air (release the valve or forcibly exhaust).

[0058] Also, the pump may be housed in a pump storage compartment in the mattress 10. For example, in FIG. 3, a compartment 104 for housing the pump is provided near a corner of the mattress 10. Note that the compartment 104 is provided with a pump cover. In this way, since the pump part is provided in a compartment in the mattress 10, the mattress 10 can be made to have an integrated state.

[0059] Note that the pump 180 may be configured separately from the mattress 10. In this case, the mattress 10 may not have a section for housing the pump 180.

[0060] Further, the pump 180 may be configured as a pump unit 182 together with a control device. The pump unit 182 includes the pump 180, a control device for controlling the pump 180, and a storage device for storing information and programs necessary for operation. For example, the control device included in the pump unit 182 can control the operation of the pump 180 according to a signal input from an operating device.

[0061] Here, the control device may include not only a control unit such as a simple CPU but also other controlling devices. For example, when the pump 180 is a diaphragm pump or an electromagnetic pump, the control device may include an electromagnetic valve for controlling the pump, a drive circuit for controlling them, a driver circuit, etc.

[0062] Also, as an example of the operating device, an operation panel 185 may be connected. That is, the operation panel 185 outputs an operation signal to the control device.

[0063] Note that the control device for controlling the pump 180 may be any one. In this embodiment, the pump unit 182 is configured integrally with the pump, but for example, the operation panel 185 may have the function of the control device.

[0064] The sub-cell 130 is an air cell used to convert the user's body position or support the user's body. The sub-cell 130 may also be referred to as a support cell, a position conversion cell, or an SF cell. In this embodiment, the sub-cell 130 is disposed under the main cell 120, but may be disposed above the main cell 120 or under the bottom cushion 140.

[0065] The bottom cushion 140 is a support member disposed under the main cell 120. For example, it is composed of a member such as urethane or hard cotton. A sensor unit 150 for detecting the user's sleeping position or the like is provided on the bottom cushion 140.

[0066] The sensor unit 150 is a sensor that uses a capacitance sensor. The sensor unit 150 has an anode 152 and a GND sheet 156 to which a case containing a GND substrate is attached. The GND sheet 156 may function as a ground (GND) electrode.

[0067] Also, in order to dispose the anode 152 on the bottom cushion 140, a sensor cover 154 is provided. For example, the sensor cover 154 has a shape capable of accommodating the anode 152, for example, a pocket. Then, by housing the anode 152 in the pocket of the sensor cover 154, the positioning of the anode 152 is performed.

[0068] Note that the sensor cover 154 is a waterproof cover for fixing the anode 152 to the bottom cushion 140 (or the cover of the bottom cushion). Note that as long as the position of the anode 152 can be determined, for example, the anode 152 may be fixed by other methods. For example, a member for fixing the anode 152 to the bottom cushion 140 or a recess may be formed. Also, the bottom cushion 140 and the anode 152 may be integrally formed so as not to move.

[0069] Also, the anode 152 is a member containing a substrate, and in the present disclosure, it is stored in an oval case. And the anode 152 is configured by attaching a conductive sheet to the back side (the side in contact with the bottom cushion 140 which is the lower side when installed).

[0070] The anode 152 may have other shapes. For example, the anode 152 may be any shape such as circular, elliptical, rectangular (rectangle, square), or polygonal. Also, the anode 152 has a conductive sheet provided on the back side. Note that the conductive sheet may be configured to cover the entire back side of the anode 152 or may be configured to cover a part of the anode 152.

[0071] Further, the anode 152 and the GND sheet 156 sandwich the bottom cushion 140. Here, the GND sheet 156 functions as a conductive sheet in whole or in part. That is, the GND sheet 156 may be composed of a material that functions as a conductive sheet in its entirety (for example, a sheet printed with conductive ink (conductive sheet) or a sheet made of conductive fibers). Further, a conductive sheet may be attached to or embedded in a part of a sheet formed in any manner for the GND sheet 156.

[0072] Here, when the user lies on the mattress 10, the bottom cushion 140 deforms, so that the distance between the anode 152 and the GND sheet 156 changes, and the capacitance changes. By the determination unit 1010 described later acquiring the change in this capacitance, the posture and position of the user can be acquired.

[0073] Note that the bottom cover 102 may have an opening for the sensor unit 150 (for example, an opening provided with a fastener) so as to easily access the sensor unit 150.

[0074] Further, the anode 152 may be arranged, for example, near the user's buttocks. That is, it may be arranged above the lumbar bottom 22e or near the foot side of the curved bottom 22b. In the present embodiment, two anodes 152 are provided on the left and right, but one anode may be provided, or three or more anodes may be provided.

[0075] [3.2 Configuration of Sensor Unit] The configuration of the sensor unit 150 will be described in detail below. As described with reference to FIG. 3, the sensor unit 150 has a structure in which the bottom cushion 140 is sandwiched between the anode 152 of the sensor and the GND sheet 156.

[0076] When the user lies on the mattress 10, the shape of the bottom cushion 140 deforms due to the load of the user. By changing the shape of the bottom cushion 140, the distance between the anode 152 and the GND sheet 156 changes. When the distance between the anode 152 and the GND sheet 156 changes, the capacitance value between the anode 152 and the GND sheet 156 changes. Here, the bottom cushion 140 may be in any shape such as urethane, hard cotton, air cell, etc. The bottom cushion 140 is flexible and may be, for example, an elastic body (e.g., polyester resin) with a relative dielectric constant of 8.1 or less.

[0077] Also, in FIG. 3, the anode 152 and the GND sheet 156 are arranged in this order from top to bottom. The anode 152 and the GND 156 may be arranged in reverse, but the arrangement in FIG. 3 is preferred in order to prevent the anode 152 from being affected by the bed bottom (so that the charge emitted from the anode 152 is not applied to the bed).

[0078] FIG. 4 is a diagram for explaining the anode 152. FIG. 4(a) is a diagram showing the anode 152 installed in the sensor cover 154 and represented from the surface (the main cell 120 side). FIG. 4(b) is a diagram schematically explaining the structure of the sensor unit 150.

[0079] As shown in FIG. 4(a), in this embodiment, two anodes 152, namely the anode 152M and the anode 152S, are provided. Here, the anode 152M is the main anode, and a controller 152c is provided as shown in FIG. 4(b). The anode 152S is a sub-anode. In this embodiment, two anodes 152 are provided on the left and right, but there may be one or three or more. In this case, one main anode 152M may be provided, and a plurality of sub-anodes 152S may be provided.

[0080] The anode 152M and the anode 152S are each connected by a coaxial cable C1. That is, the coaxial cable C1 is a cable that connects between the anodes 152 when there are a plurality of anodes 152.

[0081] Also, the anode 152M is connected to the GND sheet 156 via the cable C2. The anode 152M is also connected to the control unit 1000 via the cable C3. Here, the cables C2 and C3 may be ordinary lead wires or coaxial cables.

[0082] This anode 152 is connected to a control device (for example, the control unit 1000 in FIG. 7) via the cable C3. Here, the anode 152 may be connected to the control unit 1000 by providing a plurality of anodes 152M or the like. Also, the anode 152 may connect the anode 152M and one or more anodes 152S with the coaxial cable C1, and the anode 152M may be connected to the control device (control unit 1000).

[0083] Also, the control device may be a dedicated control device such as a control box, or an operating device such as an operation remote control. The control device may also be a terminal device connectable to the mattress 10 installed with an application.

[0084] As shown in FIG. 4(b), the anode 152M has at least a conductive sheet 152a and a sensor substrate 152b. For example, in the case containing the sensor substrate 152b of the anode 152M, the conductive sheet 152a is pasted. The conductive sheet 152a is, for example, a conductive sheet printed with carbon ink. Also, a controller 152c may be arranged on the sensor substrate 152b. The anode 152S has at least a conductive sheet.

[0085] Then, as shown in FIGS. 3 and 4(b), the GND sheet 156 is arranged so as to sandwich the anode 152 and the bottom cushion 140. The GND sheet 156 has a conductive sheet pasted on the case containing the GND substrate. The conductive sheet in this GND sheet 156 is also, for example, a conductive sheet printed with carbon ink.

[0086] The sensor substrate 152b measures the capacitance value due to the change in the distance between the anode 152 and the GND sheet 156 by the controller 152c that functions as a measurement unit. Then, the controller 152c performs A / D conversion and outputs it to the control unit (control device). Here, each case protects the substrate and the connection part between the substrate and the cable.

[0087] For example, the controller 152c acquires an analog signal from the sub-anode 152S via the coaxial cable C1. At this time, it is preferable that the sensor substrate 152b can acquire a signal with high-frequency noise cut off by using the coaxial cable C1.

[0088] The controller 152c combines the analog signals (analog values) of the two anodes, the anode 152M and the anode 152S, and performs A / D conversion (analog / digital conversion). Then, the controller 152c transmits the digitally converted signal (digital signal) to the control unit 1000.

[0089] Although the controller 152c included in the sensor substrate 152b outputs the final signal (digital signal), the control device (for example, the control unit 1000) may receive the signal and realize the same processing.

[0090] Also, the conductive sheet 152a may be provided with a layer that is at the same potential as the shield of the coaxial cable and the GND sheet on the top surface. Thereby, the influence on the capacitance due to the human body lying on the mat can be prevented.

[0091] (Other configuration 1) Note that in the configurations of FIGS. 3 and 4, the sensor unit 150 has the anode 152 and the GND sheet 156, but it may be only the anode 152 (sensor).

[0092] For example, FIGS. 5(a) and 5(b) are diagrams showing a state where the user P is lying on the main cell 120. Note that the main cell 120 is placed on the bottom cushion 140, but it may be placed on the bottom of the bed device.

[0093] Here, when the GND sheet 156 is not provided, for example, as shown in FIG. 5(a), the sensor of the anode 152 is arranged with the person side (upward in FIG. 5(a)) facing upward. By doing so, the sensor unit 150 can accumulate charge in the user P instead of the GND sheet 156. Then, the sensor unit 150 may detect a change in capacitance due to the accumulation of charge.

[0094] Also, as shown in FIG. 5(b), the sensor of the anode 152 is arranged with the bottom cushion 140 side (downward in FIG. 5(b)) facing downward. By doing so, the sensor unit 150 can accumulate charge in the bed bottom. Then, the sensor unit 150 may detect a change in capacitance due to the accumulation of charge.

[0095] (Other configuration 2) Also, by combining different members, the detection range of the sensor unit 150 may be changed.

[0096] When a load is applied from the user on the mattress, the bottom cushion 140 deforms. For example, the vicinity of the user P's buttocks is likely to change significantly. Therefore, as shown in FIG. 5(c), by providing another cushion material (for example, 140a, 140b) in the deformed region of the bottom cushion 140, the range of deformation of the cushion changes. By changing the range of deformation of the cushion, the detection range of the sensor unit 150 can be increased.

[0097] Note that the same effect can be achieved by using two different materials. For example, in the present embodiment, since there is the main cell 120 between the bottom cushion 140 and the user, the deformation due to the user's sinking can be enlarged by the main cell 120 and transmitted to the bottom cushion 140. For example, instead of the plurality of bottom cushions 140 shown in FIG. 5(c), it may be realized by an air cell and the bottom cushion 140. In this case, the main cell 120 corresponding to 140a is the air cell, and the bottom cushion 140 corresponds to 140b.

[0098] As a result, in Fig. 5(c), in the layer 140a (main cell 120) directly under the buttocks of the user P, only the vicinity of the sunken buttocks deforms, but in the layer 140b (bottom cushion 140) below that, the sinking is transmitted over a wider area.

[0099] (Other configuration 3) Also, if there is a part where the sensor unit 150 does not want to detect the user, by cutting the bottom cushion in the thickness direction, the deformation of the cushion can be interrupted. For example, the sensor unit 150 is arranged for each part of the body such as the back, buttocks, and feet. And when it is desired to independently detect the position of each part, by cutting the bottom cushion for each part, the sensor unit 150 can measure the change in capacitance of only that part without being affected by the sinking of other parts.

[0100] (Single configuration) Note that in this embodiment, the sensor unit 150 is included in the mattress 10, but the sensor unit 150 may be configured independently as a sensor device. That is, it can be attached to an existing mattress as a sensor device having the anode 152 or the anode 152 and the GND sheet 156. Also, it may be configured as a sensor system including a control device and the sensor unit 150.

[0101] For example, for the sensor device, the anode 152 and the GND sheet 156 may be installed so as to sandwich an elastic body constituting any of an existing mattress, sheet, cushion, mat, etc. Thereby, the sensor device can be applied to a support having an elastic body and supporting an object on the elastic body.

[0102] [4. Structure of cells] [4.1 Structure of main cell and sub - cell] Next, the structure of each cell (main cell 120, sub - cell 130) will be described with reference to Fig. 6.

[0103] The main cells 120 are divided into one or more systems and connected to the pump 180 via air ducts. For example, in FIG. 4, the main cells 120 are divided into systems A to C and connected to the pump 180. Specifically, air is supplied and / or exhausted to / from the cell 120A from the pump 180 via the air duct 184. And the cell 120A is connected to the system A and the pressure changes in the same way as the other cells in the system A.

[0104] The pump 180 can switch the air supply and exhaust systems, for example, by a switching valve. The pump 180 may supply and exhaust air by sequentially switching for each system, or may supply and exhaust air to the whole by communicating each system. Also, air ducts may be connected to the pump 180 for each system, or another air duct may be connected to all the air cells.

[0105] Also, in FIG. 4, the systems are divided into three systems A to C, but they may be divided into other systems. It is preferable to divide them into a plurality of systems. Also, a part of the area may be set as another system. For example, the pump 180 may supply and exhaust air to / from only the head side or only the foot side of the user P as a separate system. Also, the main cells 120 may be all composed of the same system.

[0106] The sub-cells 130 include an upper sub-cell 130S that supports around the upper body (shoulders) of the user P and a lower sub-cell 130W that supports around the lower body (waist and thighs) of the user P.

[0107] Also, the sub-cells 130 are arranged on the left and right sides of the user P. The upper sub-cell 130S includes an upper left sub-cell 130SL located on the left side when the user is in the supine position and an upper right sub-cell 130SR. Also, the lower sub-cell 130W includes a lower left sub-cell 130WL located on the left side when the user is in the supine position and a lower right sub-cell 130WR.

[0108] And the sub - cell 130 is connected to the pump 180 in a different line from the main cell 120. For example, it has a supply and exhaust line SSL for supplying and exhausting air to and from the upper left sub - cell 130SL, a supply and exhaust line SWL for supplying and exhausting air to and from the lower left sub - cell 130WL, a supply and exhaust line SSR for supplying and exhausting air to and from the upper right sub - cell 130SR, and a supply and exhaust line SWR for supplying and exhausting air to and from the lower right sub - cell 130WR. The pump 180 may be connected to each sub - cell 130 with a blower tube respectively, or may switch the sub - cell 130 for air supply and exhaust by a switching valve.

[0109] Note that the line of the sub - cell 130 may be configured as another line. For example, the sub - cell 130 may have diagonal sub - cells such as the upper left sub - cell 130SL and the lower right sub - cell 130WR in the same line. Also, the sub - cell 130 may have sub - cells on the same side such as the upper left sub - cell 130SL and the lower left sub - cell 130WL in the same line.

[0110] Also, the pump 180 may be connected with a separate blower tube for each supply and exhaust line of each line to supply and exhaust air separately, or may supply and exhaust air by switching using a switching valve. Also, the pump 180 may be connected by combining a blower tube and a switching valve.

[0111] Also, the pump 180 may be composed of one pump or may be composed of a plurality of pumps.

[0112] [4.2 Structure of Sub - cell] The structure of the sub - cell will be described. FIG. 7 shows a plan view of the shape of the sub - cell 130.

[0113] As shown in FIG. 7, the sub - cell 130 has a curved shape (for example, an R - shape as a curved shape) on its side. For example, the region R130a is a curved shape (R - shape) formed on the outer side of the sub - cell 130 (the first side surface on the left side in FIG. 7). This R - shape preferably has a curve radius R = 450 - R500 mm. For example, in FIG. 7, it is R486 mm.

[0114] In addition, when the sub-cell 130 is disposed in the mattress 10, the R shape of this region R132 is formed to follow from the user's lumbar rib to the outer edge of the scapula. By being positioned approximately near the outer edge of the user's scapula, this R shape enables support for the user. Note that the outer side of the scapula refers to the side located on the left and right outer sides of the user's body.

[0115] Also, the inner side (the second side surface on the right side in FIG. 7) of the sub-cell 130 has an R shape as a concave shape. For example, the region R134 is formed slightly above the center of the sub-cell 130. The length of this concave R shape (L134 in FIG. 5) is 304 mm, and as an example, it is formed at positions 153 mm from the upper side (L132 in FIG. 5) and 293 mm from the lower side (L136 in FIG. 7). Also, the width of the sub-cell 130 at the most concave position of the concave shape (L138 in FIG. 7) is 182 mm.

[0116] When the sub-cell 130 is disposed on the mattress 10, the R shape of this region R134 is arranged to support the user's buttocks. That is, the sub-cell 130 can support the user's buttocks by being arranged such that the inner R shape (the concave R shape) is positioned near the user's buttocks.

[0117] Also, the lower region R136 on the inner side of the sub-cell 130 is substantially straight. When the sub-cell 130 is disposed on the mattress 10, the substantially straight shape on the inner side of this region R136 is arranged to support the user's thigh. That is, the sub-cell 130 supports the user's buttocks with the region R134 and supports the user's thigh with the region R136.

[0118] The above-described sizes are example values for explaining the size of the sub-cell 130 and are not limited to these numerical values. These disclosed sizes of the sub-cell 130 are included in an equivalent range as long as they can exhibit the effect of the sub-cell 130 supporting the user.

[0119] For example, the length of L134 in FIG. 5 may be any length that can support the user's buttocks. L134 is preferably included in the range of 240 mm to 320 mm. Also, the length of L136 of L5 may be any length that can support the user's thighs. L136 is preferably included in the range of 150 to 360 mm.

[0120] By arranging this sub-cell 130 with its orientation changed in the vertical, horizontal, left, and right directions, it becomes possible to appropriately instruct the user.

[0121] FIG. 8(a) is a diagram showing the sub-cell 130 arranged on the upper body side of the user. For example, the sub-cell 130 is arranged as the upper left sub-cell 130SL on the left side of the user P (the right side in FIG. 8(a)) and as the upper right sub-cell 130SR on the right side of the user P (the left side in FIG. 8(a)).

[0122] In FIG. 8(a), the sub-cell 130 is arranged in a V shape along the sides of the user P's lumbar spine towards the outer edges of the scapulae. At this time, for example, the sub-cell 130 (the upper right sub-cell 130SR) is arranged to extend in a direction forming a predetermined angle R1 from the center. For example, in the case of FIG. 8(a), the angle R1 is approximately 22 degrees. This angle R1 is an appropriate angle for arranging along the outer side of the user's scapula and is preferably about 15 degrees to 36 degrees. That is, the portion (the convex portion) that forms and protrudes at the angle R1 is located near the outer edge of the scapula.

[0123] Also, the upper left sub-cell 130SL and the upper right sub-cell 130SR are arranged with the sub-cell 130 reversed left and right and have the same shape.

[0124] Also, when the sub-cell 130 is inflated, both sides of the user's lumbar spine are arranged at positions where the height of the cell bulges the most.

[0125] Figure 8(b) is a diagram showing the sub-cell 130 arranged on the lower body side of the user. For example, the sub-cell 130 is arranged as the lower left sub-cell 130WL on the left side of the user P (the right side in Figure 8(b)) and as the lower right sub-cell 130WR on the right side of the user P (the left side in Figure 8(b)). As shown in Figure 8(b), when the sub-cell 130 is arranged on the lower body side of the user, it has a curved shape along the buttocks and thighs of the user.

[0126] Also, the concave portion inside the sub-cell 130 of the sub-cell 130 supports the user's buttocks from both sides by being at a position surrounding the user's buttocks. Also, the linear shape inside the sub-cell 130 supports the user's thighs from both sides by following the user's thighs.

[0127] Here, the lower left sub-cell 130WL and the lower right sub-cell 130WR are the sub-cell 130 arranged oppositely left and right and have the same shape. Also, compared with Figure 8(a), they are arranged with the top and bottom reversed.

[0128] Also, when the sub-cell 130 is inflated, it is arranged so that the two sides of the user's buttocks bulge with the highest cell height.

[0129] Figure 8(c) is a schematic diagram when all the sub-cells are arranged. For the user P, the sub-cell 130 is arranged as the upper left sub-cell 130SL, the upper right sub-cell 130SR, the lower left sub-cell 130WL, and the lower right sub-cell 130WR.

[0130] In this way, the mattress 10 has four sub-cells 130 arranged, and by sequentially inflating and deflating each sub-cell 130, it becomes possible to perform position conversion of the user and the like.

[0131] Note that the upper sub - cell and the lower sub - cell may have different shapes. That is, when the sub - cell is arranged on the upper body side of the user P, it only needs to have an outer R - shape (convex shape). For example, in Fig. 8(a), the shape of the sub - cell 130 protrudes outward from the user's shoulder, but this is for the purpose of making it the same shape when arranged on the lower body side. Therefore, the shape of the sub - cell 130 may not protrude outward from the shoulder and may be the shape up to the shoulder.

[0132] [4.3 Position of the Sub - cell] Fig. 9 is a diagram for explaining the positions of the sub - cell 130, the bottom 22, and the main cell. Fig. 9 is a top - view of the mattress 10. The upper sub - cells 130S (upper left sub - cell 130SL and upper right sub - cell 130SR) arranged on the upper body side are mainly arranged from the back bottom 22a to the curved bottom 22b. Also, the lower sub - cells 130W (lower left sub - cell 130WL and lower right sub - cell 130WR) arranged on the lower body side are arranged across the curved bottom 22b, the knee bottom 22c, and the foot bottom 22d.

[0133] Here, the sub - cells 130 (upper left sub - cell 130SL and upper right sub - cell 130SR) arranged on the upper body side are arranged in a V - shape such that the outer R - shape (the side located more towards the center of the mattress 10 in Fig. 9) of the sub - cell 130 extends along from both sides of the user's lumbar vertebra to the outer edge of the scapula. That is, when the mattress 10 (bed body 20) is viewed in plan, it is arranged obliquely from the center of the mattress 10 towards the outer side (the head - side corner) of the mattress, forming a V - shape.

[0134] Here, the range from both sides of the user's lumbar vertebra to the scapula, when the width direction of the bed body 20 is 910 mm, is preferably in the range of 25% of the longitudinal direction of the back bottom 22a and 12% - 45% from the center in the short - hand direction.

[0135] Specifically, in FIG. 9, when the position M01 of the trochanter of the user is assumed to be 980 mm from the foot side end, the position M02 of the scapula of the user is 465 mm from the trochanter. Therefore, the R shape (convex shape) of the sub-cell 130 is preferably included in the following range (rectangular region M06).

[0136] · One side is the length from the scapula position M02 to the end on the curved bottom 22b side of the back bottom 22a (about 160 mm) · The other side is the length from the position 12% (the length from M03 to M04, about 59 mm from the center) to the position 45% from the center of the mattress 10 (the length from M04 to M05, about 148 mm) Also, when installed on the bed body 20 provided with the lumbar bottom 22e instead of the curved bottom 22b, the range from both sides of the lumbar vertebra to the scapula is preferably 40% in the longitudinal direction of the back bottom 22a and 12% - 45% from the center in the lateral direction.

[0137] In this case, the length from the scapula position M02 of the back bottom to the end on the lumbar bottom 22e side of the back bottom 22a is about 320 mm.

[0138] Also, the lower sub-cell 130W is preferably arranged near the buttocks of the user. The lower sub-cell 130W will contact the user across the user's waist, buttocks, and thighs. The concave portion (position M07) of the lower sub-cell 130W is arranged so as to be generally at the position from the curved bottom 22b (or lumbar bottom) to the knee bottom 22c. In this way, the concave portion (position M07) is preferably arranged to be located near the buttocks of the user.

[0139] [5. Functional Configuration] FIG. 10 is a diagram showing the functional configuration of the bed system 1 (mattress 10). The function shown in FIG. 10(a) explains the function of controlling the mattress 10, which is realized by a control device for controlling the mattress 10. Note that the function shown in FIG. 10(a) may also be realized by the control device of the bed body 20 when the bed body 20 and the mattress 10 are in cooperation.

[0140] The control unit 1000 is a functional unit for controlling the entire mattress 10. The control unit 1000 realizes various functions by reading and executing various programs stored in the storage unit 1300, and is constituted by, for example, one or a plurality of arithmetic units (for example, a CPU (Central Processing Unit)).

[0141] In addition, the control unit 1000 can also control the main cell 120, which is an air cell, and the sub-cell 130. Here, controlling the air cell by the control unit 1000 means controlling the pressure of the air cell. Further, as the pressure of the air cell changes, the air cell expands / contracts. That is, the control unit 1000 can control the size (swelling) of the air cell.

[0142] For example, by controlling the pump 180, the control unit 1000 supplies air to or exhausts air from each air cell. This refers to the control of increasing or decreasing the pressure of each air cell by the control unit 1000. Further, when the control unit 1000 decreases the pressure of the air cell, it may exhaust air by releasing a valve, or may forcibly exhaust air by controlling the pump 180.

[0143] In addition, the control unit 1000 may function as a determination unit 1010 and a body position conversion unit 1020 by reading and executing a program from the storage unit 1300.

[0144] The determination unit 1010 determines the state of the user based on the information measured by the measurement unit 1602 and the information detected by the detection unit 1600.

[0145] The determination unit 1010 can determine the body position of the user as the state of the user, including, for example, whether the user is in bed, the position of the user (sleeping position), and the posture of the user (sleeping posture).

[0146] For example, the determination unit 1010 may determine whether the user is in the supine position, prone position, or lateral position (right lateral position, left lateral position). Further, the determination unit 1010 may determine at which position on the mattress the user's sleeping position is. Further, the determination unit 1010 may determine the sitting position (kneeling position, long sitting position) as the user's posture.

[0147] The body position conversion unit 1020 controls the sub-cells 130 to convert the body position of the user. For example, when the sub-cells 130 are arranged as shown in FIG. 6, the lower right sub-cell 130WR → the upper right sub-cell 130SR → the upper left sub-cell 130SL → the lower left sub-cell 130WL, and the expansion and contraction of the sub-cells are sequentially controlled. In this way, by repeating the expansion and contraction of each sub-cell 130, the body position conversion by the small pillow method can be performed.

[0148] The storage unit 1300 is a functional unit that stores various programs and various data necessary for the operation of the mattress 10. The storage unit 1300 is composed of, for example, a semiconductor memory, an HDD (Hard Disk Drive), or the like.

[0149] The storage unit 1300 may store a control table 1310. The control table 1310 stores, for example, a control pattern that is the timing of the expansion and contraction of the sub-cell 130. The body position conversion unit 1020 controls the timing of the expansion and contraction operation of the sub-cell 130 based on the control pattern stored in the control table 1310.

[0150] The operation unit 1400 receives an operation input from an operator. For example, it is an operation remote control having one or more operation buttons, a connected terminal device capable of displaying an operation screen (for example, an information processing device such as a smartphone or a tablet, a terminal device used in other medical systems, etc.).

[0151] The operation unit 1400 can operate the mattress 10, but may also be able to operate the bed body 20. Further, the operation unit 1400 may be added as an operation button capable of operating the mattress 10 to the operation unit of the bed body 20.

[0152] The display unit 1500 displays the state of the mattress and the state of the operation to the operator. The display unit 1500 is any display device such as an LED lamp, an LED using a 7-segment display, a liquid crystal display, an organic EL panel, or the like. Further, when a terminal device is connected, the display unit 1500 uses the display device of the terminal device. Further, the display unit 1500 may be provided in the operation unit 1400 or may be configured integrally with the operation unit 1400 as a touch panel capable of touch operation.

[0153] The notification unit 1550 notifies the user and the operator. The notification unit 1550 performs various notifications by, for example, outputting an alarm sound or a warning sound by a speaker or the like, performing a warning display on the display unit 1500, performing vibration by a vibration device, or performing a flash by a light emitting device.

[0154] The detection unit 1600 is a sensor that detects various states. For example, the detection unit 1600 can detect the pressure of the air cell by a pressure sensor or detect the state of the bed body 20 from the state of the mattress 10 by an angle sensor. Each sensor may be built into the mattress 10 or provided externally. Further, the value detected by the sensor provided in the bed body 20 may be acquired. In the present embodiment, for example, it is the sensor unit 150.

[0155] Further, when the detection unit 1600 functions as the sensor unit 150, it may further have a measurement unit 1602. The measurement unit 1602 measures, for example, a change in capacitance. Then, the measurement unit 1602 outputs the change value of the changed capacitance to the control unit 1000. Note that the measurement unit 1602 may be realized by the control unit 1000.

[0156] Note that the configuration in Fig. 10(a) may have other necessary functions. For example, it may be provided with a communication unit for communicating with other terminal devices. Also, it may be provided with only the necessary configurations as required. For example, the mattress 10 may have at least a control unit 1000 and a storage unit 1300, and the operation unit 1400, the display unit 1500, the notification unit 1550, and the detection unit 1600 may be provided as required.

[0157] Also, Fig. 10(a) is a diagram for explaining the entire system 1 (mattress 10). For example, an example of a specific configuration is shown in Fig. 10(b). The mattress 10 in Fig. 10(b) includes a control device and a pump (pump 180 in Fig. 3) in the pump unit 182. And the control device controls the pump 180 to discharge air into the air cell, inhale air from the air cell, and control the pressure of the air cell.

[0158] Also, the pump unit 182 has a control unit 1000 and a storage unit 1300 as control devices. Also, the pump unit 182 is connected to an operation panel 185 and a detection unit 1600.

[0159] The operation panel 185 has a control unit 1002 for controlling the operation panel 185 itself, an operation unit 1400, a display unit 1500, and a notification unit 1550. The operation panel 185 outputs an operation signal to the control unit 1000. Also, the operation panel 185 performs display and notification based on the signal received from the control unit 1000.

[0160] Also, the detection unit 1600 is, for example, a sensor unit 150 and can be added as required.

[0161] The pump unit 182, the operation panel 185, and the detection unit 1600 transmit and receive necessary information. For example, when the operation device is provided with a control unit 1000 and a storage unit 1300, the operation panel 185 may directly control the pump 180.

[0162] Alternatively, it may be implemented by a terminal device such as a smartphone instead of the operation device. It can be realized by installing and executing an application that realizes it as the operation panel 185 on the terminal device. Similarly, any of the other configurations may be implemented by either the air mattress or another control device.

[0163] Further, the pump unit 182 may be connected to the bed body 20. By connecting to the bed body 20, for example, it becomes possible to control the bottom or detect the bottom angle.

[0164] Note that the pump unit 182 may be integrally configured with the control board of the pump 180 by the control device (control unit 1000 and storage unit 1300), or may have a separate configuration connected to the pump 180.

[0165] [6. Determination of sleeping position] [6.1 When there are multiple anodes] A method for the determination unit 1010 to determine the position (sleeping position) of the user on the air mattress 10 will be described.

[0166] Figs. 11(a) and (b) are diagrams showing the amount of change (change value) in capacitance when the user is positioned on the air mattress. That is, it is a graph showing the change value of the capacitance measured by the measurement unit 1602 when changing from the out-of-bed state (state where there is no user on the air mattress) to the in-bed state (state where there is a person on the air mattress).

[0167] Fig. 11(a) is a graph showing the change in capacitance when the user sleeps in the center of the air mattress 10. The vertical axis indicates the change value (pF) of the capacitance from the out-of-bed state. Also, the left graph shows the change value of the capacitance measured by the anode 152 arranged on the right side of the user's buttocks. The right graph shows the change value of the capacitance measured by the anode 152 arranged on the left side of the user's buttocks.

[0168] In this case, the change value of the capacitance from the out-of-bed state is 0.70 pF on the right side of the buttocks and 0.80 pF on the left side of the buttocks. That is, almost the same change value of capacitance is measured for both the left and right sensors (anode 152).

[0169] On the other hand, Fig. 11(b) is a graph showing the change in capacitance when the user lies on the end of the mattress 10. In this case, the change value of the capacitance from the out-of-bed state is 0.20 pF on the right side of the buttocks and 1.00 pF on the left side of the buttocks.

[0170] Thus, when the user lies on the end of the mattress 10, the change amount of the capacitance of one of the sensors (anode 152) (the left side of the buttocks in Fig. 11(b)) changes by more than twice the change amount of the other sensor (anode 152) (the right side of the buttocks in Fig. 11(b)).

[0171] The determination unit 1010 can determine on which side of the mattress the user has shifted or is located by obtaining this change amount.

[0172] Note that although the case where two anodes 152 are provided in the sensor unit 150 has been described, the same applies to the case of three or more anodes. By providing three or more anodes, for example, not only the shift in the short side direction but also the shift in the longitudinal direction can be used to determine the sleeping position. By increasing the number of anodes, the sleeping position can be determined more finely for each part of the body, and the detectable range of the sleeping position on the mattress can be expanded.

[0173] [6.2 When there is one anode] Note that when the determination unit 1010 determines the position (sleeping position) of the user on the mattress 10, there may be only one anode 152. In this case, the determination unit 1010 determines the sleeping position of the user in combination with other parameters.

[0174] For example, the determination unit 1010 determines the sleeping position in combination with one change value of the capacitance measured by the measurement unit 1602, the internal pressure information of the cell, and the weight setting value.

[0175] (1)Combination with internal pressure change 1 The control unit 1000 estimates the user's weight from the exhaust time of the air cell (main cell 120). FIG. 11(c) is a diagram showing the exhaust time and the change in internal pressure measured for each user weight. As shown in FIG. 11(c), the exhaust time from an internal pressure of 2 kPa to 0.5 kPa takes 32 seconds when the user's weight is 30 kg, 40 seconds when it is 59 kg, and 49 seconds when it is 78 kg. From this, it can be seen that the user's weight and the exhaust time have a correlation. Therefore, the control unit 1000 estimates the user's weight from the exhaust time.

[0176] Here, when changing from the out-of-bed state to the in-bed state, the change value of the capacitance of the bed position sensor differs depending on the weight. Here, a table storing the change value of the capacitance when the user is at the center (middle) of the mattress 10 and the change value of the capacitance when the user is at the end of the mattress 10 for each weight is stored in the storage unit 1100 in advance.

[0177] Then, the determination unit 1010 refers to the table and determines the user's sleeping position based on the user's weight and the change value of the capacitance.

[0178] FIG. 12(a) is a diagram showing the change amount of the capacitance value from the out-of-bed state for each sleeping position of users with weights of 19 kg, 42 kg, and 64 kg. As shown in FIG. 12(a), the farther away from the center, the smaller the change amount of the capacitance value of the sensor arranged at the center.

[0179] For example, even if the capacitance value is measured to be 0.22, the determination unit 1010 cannot specify the user's sleeping position. However, by combining with different parameters such as the user's weight, the determination unit 1010 can determine the user's sleeping position.

[0180] Note that if the user's weight is specified, the user's sleeping position may be determined by comparing the capacitance value calculated by the correlation function with the actually measured change value of the capacitance.

[0181] (2) Combination with internal pressure 2 Note that the method by which the control unit 1000 estimates the user's weight may be based on the increase in the internal pressure of the air cell. When the user lies on the air cell (main cell 120), the internal pressure of the air cell increases. FIG. 12(b) is a diagram measuring the change in the user's weight and the internal pressure. FIG. 12(b) is a diagram showing the increase in the internal pressure when users of 20 kg, 40 kg, and 60 kg lie on an air cell with an internal pressure of 2.5 kPa.

[0182] Thus, the control unit 1000 estimates the user's weight from the increase in the internal pressure. Then, the determination unit 1010 determines the user's sleeping position based on the user's weight and the change value of the capacitance.

[0183] (3) Set weight Note that the user's weight used by the control unit 1000 as a parameter may be set by the operation unit 1400. In this case, the determination unit 1010 may determine the user's sleeping position based on the set user's weight and the change value of the capacitance.

[0184] [7. Flow of processing] The flow of processing of this embodiment will be described.

[0185] [7.1 First process] FIG. 13 is a flowchart showing the first process executed by the control unit 1000. First, the control unit 1000 determines a control pattern according to the user (step S102).

[0186] The control pattern may be defined as the process of the determination unit 1010, or may be stored in the storage unit 1300 by one or more. The control pattern stores, for example, a combination of the operation order, operation location, operation time, operation frequency, operation pressure, and operation speed of the air cell (sub-cell 130). Further, not only the sub-cell 130 but also the combined operation with the main cell 120 may be stored.

[0187] Then, the control unit 1000 (the body position conversion unit 1020) controls the sub-cell 130 according to the control pattern (step S104). That is, the body position conversion unit 1020 executes the body position conversion operation.

[0188] During the execution of the body position conversion operation, the determination unit 1010 determines the sleeping position of the user (step S106). Here, the sleeping position of the user may be determined by the method described in "6. Determination of the sleeping position".

[0189] Subsequently, the determination unit 1010 determines whether the position (sleeping position) of the user is at a specific position (step S108). Here, the specific position refers to the vicinity of the end of the mattress 10 and a range within a predetermined distance from the mattress 10. For example, an area 100 mm from the right end of the mattress and 100 mm from the left end of the mattress is referred to as the specific position.

[0190] Also, a position where the center of the user's body is separated from the center of the mattress by a predetermined distance or more may be defined as the specific position. For example, a position preferably shifted 230 to 260 mm, more preferably 250 mm or more to the left or right from the center of the mattress may be defined as the specific area. That is, when the center of the user's body is shifted 250 mm from the center of the mattress, the determination unit 1010 determines that the user is at the specific position.

[0191] FIG. 14 is a diagram schematically showing the user P and the mattress 10. Here, the mattress 10 defines a predetermined area R100 from the longitudinal end of the mattress as the specific position. The determination unit 1010 determines whether the sleeping position of the user is in this area R100.

[0192] When the position of the user is at the specific position, the control unit 1000 changes the control pattern according to the position of the user (step S110).

[0193] For example, when the user is located in a specific area on the right side of the mattress 10, the control unit 1000 invalidates the operations of the sub-cells on the right side (sub-cells 130SR and 130WR) (hereinafter, the sub-cells to be controlled are referred to as "specific sub-cells"). Thereby, the control unit 1000 performs control to stop the expansion and contraction operations of the sub-cells 130SR and 130WR on the right side in the control pattern, or to exhaust air to make the internal pressure the same as the atmospheric pressure.

[0194] In addition, for the remaining sub-cells 130 (normal sub-cells), the control unit 1000 continues the expansion and contraction operations. In this case, the control unit 1000 controls the pump 180 to intake / exhaust air for the sub-cells 130SL and 130WL on the left side and perform the expansion and contraction operations.

[0195] The control unit 1000 repeatedly executes the above processing until there is an operation to end the operation or an interruption (step S112; No → step S104). The control unit 1000 ends the processing of FIG. 13 when, for example, an operation to stop the operation is performed by the user, a staff member, etc., when it has been determined that the operation ends according to the control pattern, or when there is an interruption to stop the operation due to detection of getting out of bed (step S112; Yes).

[0196] Note that when the control unit 1000 changes the control pattern in step S110, an example was described of invalidating the operation of a specific sub-cell and stopping the expansion and contraction of a specific sub-cell. In addition to this, the control unit 1000 may switch the control of the sub-cells.

[0197] For example, the control unit 1000 may change the number of operation times of the expanding and contracting sub-cells. For example, the control unit 1000 may switch to a control in which the sub-cells on the left side are expanded and contracted twice and then the sub-cells on the right side are expanded and contracted once.

[0198] Further, the control unit 1000 may change the operation time and operation speed of the expanding and contracting sub-cells. That is, the control unit 1000 may control the pump 180 and make the air supply / exhaust amounts different. For example, for the pump 180 to expand the sub-cells, normal sub-cells supply air at a first output, while specific sub-cells may supply air at a second output smaller than the first output (e.g., Duty 36%, closing pressure 15 kPa) (e.g., Duty 27%, closing pressure 11 kPa). Thereby, specific sub-cells expand more slowly (longer operation time) compared to other sub-cells.

[0199] Also, the control unit 1000 may switch the amount of air supplied to the sub-cells. For example, for normal sub-cells, the control unit 1000 operates the pump 180 for a first time. And for specific sub-cells, the control unit 1000 operates the pump 180 for a time different from the first time (e.g., less than the first time) (e.g., 29 seconds) (e.g., 49 seconds). Thereby, the amount of air supplied to specific sub-cells becomes less compared to other sub-cells, and the magnitude of expansion becomes smaller. Also, the control unit 1000 may control the pressure for operating the pump 180 instead of time. For example, the control unit 1000 may specify a first pressure (e.g., 4 kPa) and a second pressure (e.g., 3 kPa) smaller than the first pressure for the pump 180.

[0200] [7.2 Second Process] The second process in FIG. 15 is a process of further changing the control pattern according to the user's posture. Note that the description will focus on the differences from the first process in FIG. 13.

[0201] In the second process, the determination unit 1010 determines whether the user's posture is a specific posture (step S202). Here, the specific posture may be a posture stored in the control table or a posture stored in advance as a posture for changing the control pattern.

[0202] When the user's posture is a specific posture, the control unit 1000 changes the control pattern according to the user's posture (step S202; Yes → step S204).

[0203] Here, the control pattern can include various combinations. For example, FIG. 16(a) is an example of a table showing the control pattern. For example, when the user is in the supine position, the control unit 1000 performs control to repeatedly expand and contract in the order of sub-cell 130WR (first sub-cell) → sub-cell 130SR (second sub-cell) → sub-cell 130SL (third sub-cell) → sub-cell 130WR (fourth sub-cell).

[0204] Note that the control unit 1000 may expand and contract each sub-cell 130 one by one, or may expand and contract as a series of operations. For example, the control unit 1000 may expand and contract the first sub-cell and then expand and contract the second sub-cell one by one. Also, the control unit 1000 may expand the first sub-cell, expand the second sub-cell... and after expanding all the sub-cells, contract the first sub-cell, contract the second sub-cell...

[0205] Also, the control unit 1000 may control these expansion and contraction operations based on a control table. For example, the control pattern may store only the order of expansion and contraction, or may store the order of expansion and contraction separately.

[0206] As shown in FIG. 16(b), when the user's posture is diagonally to the right, the control unit 1000 repeatedly expands and contracts in the order of the first sub-cell (sub-cell 130WR) → the third sub-cell (sub-cell 130SL). Here, diagonally to the right means, for example, a state where the user P is facing 30 degrees diagonally to the right from the vertical.

[0207] Also, as shown in FIG. 16(c), when the user P is diagonally to the right, the control unit 1000 repeatedly expands and contracts in the order of the first sub-cell (sub-cell 130WR) → the second sub-cell (sub-cell 130SR).

[0208] Note that the control unit 1000 may change the pressure of the sub - cells at this time. For example, when the user's posture is diagonally to the right, the control unit 1000 may make the internal pressure of the third sub - cell (sub - cell 130SL) higher than that of the first sub - cell (sub - cell 130WR).

[0209] Also, when the user's posture is to the right, the control unit 1000 may make the internal pressure of the third sub - cell (sub - cell 130SL) the same as that of the first sub - cell (sub - cell 130WR).

[0210] In addition to the operation order and operation location, the control patterns of the sub - cells stored in the storage unit 1300 can be stored in various ways. For example, the control patterns may store things such as operation time, operation frequency, operation pressure, and operation speed.

[0211] As described with reference to FIG. 13, when the control unit 1000 switches the control of the sub - cells, it can not only deactivate the sub - cells 130 (stop expansion and contraction), but also switch the operation frequency, operation time, operation speed, etc. of the sub - cells.

[0212] Note that in the determination process of step S106, the determination unit 1010 determines not only the sleeping position of the user but also the user's posture. The determination unit 1010 determines the posture based on, for example, the signal measured by the measurement unit 1602. The postures determined by the determination unit 1010 can be postures such as the supine position, the lateral position (right lateral position, left lateral position), the orthostatic position, the semi - sitting position, and the long - sitting position. Here, several methods for the determination unit 1010 to determine the posture are described below.

[0213] (1) Change value of capacitance The user's posture is determined from the change in capacitance measured by the sensor unit 150. For example, if the change in capacitance of the left and right anodes 152 is equal, the determination unit 1010 determines that the user is in the supine position; if the change in capacitance of one of the anodes 152 is large, the determination unit 1010 determines that the user is in the lateral position.

[0214] Further, the memory unit 1300 may store a table associating the change value of the capacitance with the posture. The determination unit 1010 determines the posture from the table based on the change value of the capacitance measured by the sensor unit 150.

[0215] An example of the change in capacitance will be described with reference to FIG. 16(d). FIG. 16(d) shows examples of capacitance values with respect to the sleeping positions and postures of a user weighing 50 kg and a user weighing 71 kg.

[0216] In FIG. 16(d), the capacitances in the supine position and the lateral position when the user is at the center of the mattress, and the capacitances in the supine position and the lateral position when the center of the user's body is shifted 150 mm to the left from the center of the mattress are shown.

[0217] Here, when the user is in the supine position at the center, the capacitance values on the left and right are almost the same. Also, when changing from the supine position to the lateral position at the center, the capacitance value on one side of the left and right hardly changes from the supine position, and the opposite side becomes nearly half. Further, when the center of the user's body is 150 mm to the left of the center of the mattress and in the supine position, the sum of the capacitance values on the left and right when in the supine position at the center is almost the same as the capacitance value on only the left side. Also, when the center of the user's body is 150 mm to the left of the center of the mattress and changes from the supine position to the lateral position, the capacitance values on the left and right do not change much, but the sum of the left and right slightly decreases.

[0218] In this way, the capacitance values are stored in association with the user's weight and their positions. Thereby, the determination unit 1010 determines the user's posture using the stored table.

[0219] Further, the determination unit 1010 can capture the characteristics of the user's lateral position from the way of change, and determine whether it is a complete lateral position or a 30-degree lateral position from the magnitude of the change amount.

[0220] In addition, the determination unit 1010 does not make a determination only based on the result after the user has finished moving or changing their posture. Instead, even while the user is moving or changing their posture, since the capacitance value changes while having the same characteristics, the operation can be predicted and determined at an intermediate stage.

[0221] (2) Machine learning The posture of the user is determined from the change in capacitance measured by the sensor unit 150. For example, the storage unit 1300 stores a learned dictionary (learning dictionary) that outputs the posture with the capacitance as the input value. The determination unit 1010 refers to the learning dictionary from the change value of the capacitance acquired by the sensor unit 150 and determines the posture.

[0222] (3) Posture determination device The determination unit 1010 may determine the posture from, for example, a separately connected posture determination device. The posture determination device acquires the posture of the user by analyzing, for example, infrared rays or the image of a camera. Further, the determination unit 1010 may determine the posture of the user from the change in the load value acquired by the load sensor provided in the bed device.

[0223] [8. Effects] As described above, according to the present embodiment, when the user performs a body position conversion operation, when the sleeping position of the user moves to the vicinity of the end, it is possible to automatically invalidate the sub-cell that performs the body position conversion. Further, when the user performs a body position conversion operation, an appropriate control pattern can be selected according to the posture of the user.

[0224] According to the present embodiment, it is possible to prevent the user from falling due to the body position conversion operation. Further, according to the present embodiment, it is possible to prevent the user from shifting due to the body position conversion operation.

[0225] Further, according to the present embodiment, since the sub-cells other than the invalidated sub-cell continue to operate, the effect of the body position conversion is not lost. Further, according to the present embodiment, since the control pattern changes according to the posture of the user, an appropriate body position conversion can be performed according to the state of the user.

[0226] [9. Modification Example] As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and designs and the like within the scope not departing from the gist of the present invention are also included in the claims.

[0227] Also, the programs operating in each device in the embodiment are programs that control a CPU or the like (programs that enable a computer to function) so as to realize the functions of the above-described embodiment. And the information handled by these devices is temporarily stored in a temporary storage device (for example, RAM) during its processing, and then stored in storage devices such as various ROMs and HDDs, and read out by the CPU as needed for correction and writing.

[0228] Here, as the recording medium for storing the program, any non-temporary recording medium such as a semiconductor medium (for example, ROM, non-volatile memory card, etc.), an optical recording medium or a magneto-optical recording medium (for example, DVD (Digital Versatile Disc), MO (Magneto Optical Disc), MD (Mini Disc), CD (Compact Disc), BD, etc.), a magnetic recording medium (for example, magnetic tape, flexible disk, etc.) may be used. Also, by executing the loaded program, not only the functions of the above-described embodiment are realized, but in some cases, the functions of the present invention are realized by jointly processing with an operating system or other application programs or the like based on the instructions of the program.

[0229] Also, when distributing it on the market, the program can be stored in a portable recording medium for distribution, or transferred to a server computer connected via a network such as the Internet. In this case, the storage device of the server computer is of course also included in the present invention.

[0230] Further, part or all of each device in the above-described embodiments may typically be realized as an LSI (Large Scale Integration), which is an integrated circuit. Each functional block of each device may be individually chip-sized, or part or all of them may be integrated and chip-sized. Also, the method of integrating into an integrated circuit is not limited to LSI, and it may be realized by a dedicated circuit or a general-purpose processor. Further, when a technology for integrating into an integrated circuit that replaces LSI appears due to the progress of semiconductor technology, it goes without saying that it is also possible to use an integrated circuit based on such technology.

[0231] [9.1 Configuration of Subcells] In the above-described embodiments, all subcells have been described as having the same shape, but they may have different shapes. For example, the subcells arranged on the upper body side may have a shape that follows from both sides of the user's lumbar vertebrae toward the outer edge of the scapula.

[0232] For example, as shown in FIG. 17, the subcell 130 does not have to be arranged in a V shape. The subcell 230 in FIG. 10 is supported by the R-shaped region R230a that the subcell 230 has, from both sides of the user's lumbar vertebrae to the outer edge of the scapula. Thus, the subcell may have an R shape in the vicinity of a location along from both sides of the user's lumbar vertebrae toward the outer edge of the scapula.

[0233] Also, the subcell 130 was separated left and right in the above-described embodiments, but it may be integrally formed. For example, as shown in FIG. 18, the subcell 235 is formed as one subcell. The subcell 235 may be formed by integrally connecting two subcells with an air cell film or the like, or may be formed so that an R-shaped bulge can be formed by providing a wall in one air cell.

[0234] [9.2 Configuration of Mattress] In the above-described embodiment, the mattress has been described as an air cell, but other configurations may also be used. For example, as shown in FIG. 19, the mattress between the upper cover 100a and the lower cover 102a may be a urethane mattress 122. At this time, the sub-cell 130 is disposed below the urethane mattress 122 as shown in FIG. 19. Note that the sub-cell 130 may be disposed above the urethane mattress 122.

[0235] [9.3 Arrangement of Sub-Cells] In the above-described embodiment, the sub-cell 130 has been described as being provided within the mattress, such as below or above the main cell 120 that constitutes the air mattress. However, the sub-cell 130 may have a configuration separate from the mattress.

[0236] For example, FIG. 20 shows an underlay type in which the sub-cell 130 is disposed below the mattress 10. In this case, the mattress 10 may be an existing mattress, and the sub-cell 130 of the above-described embodiment can be easily arranged. Thereby, without preparing a dedicated mattress, it is possible to easily provide the function of changing the body position by the sub-cell to the existing mattress. Note that the sub-cell 130 may be an overlay type laid on the existing mattress.

[0237] That is, the sub-cell 130 may be composed of a single sheet. For example, the sub-cell sheet 190 in FIG. 13 has a plurality of spaces. When air is supplied from the pump 180 to this space, the space expands and functions as a sub-cell. That is, air is supplied to and exhausted from the space provided in the sheet from the pump 180, so that the space expands and contracts, and thus has the same function as the sub-cell.

[0238] In the case of the sub-cell sheet 190 in which the sub-cells are integrally formed in a sheet shape as described above, the same effect can be expected by simply installing the sub-cell sheet 190 below the mattress 10. Also, the sub-cell sheet 190 may be installed above the mattress 10.

[0239] [9.4 Bottom Configuration] In the above-described embodiment, the configuration of the bottom of the bed body has been mainly described as including a back bottom, a curved bottom, a knee bottom, and a foot bottom. However, the present invention is not limited to such a configuration. For example, generally, the curved bottom may have the function of the back bottom or the function of the lumbar bottom. Also, among the configurations of the bottom, the foot bottom may be integrally formed with the knee bottom. Further, the back bottom may be divided into a plurality of parts to achieve the same effect as the curved bottom (for example, among the divided back bottoms, the back bottom on the foot side supports the user's waist). The curved bottom may also be referred to as the lumbar bottom.

Description of Reference Numerals

[0240] 1 Bed system 10 Mattress 20 Bed body 22 Bottom 22a Back bottom, 22b Curved bottom 22c Knee bottom, 22d Foot bottom, 22e Lumbar bottom 24 Upper frame 26 Lower frame 28 Lifting mechanism 32 Back bottom drive unit 34 Knee bottom drive unit 36 Height drive unit 100 Top cover 102 Bottom cover 110 Top urethane 115 Glide sheet 120 Main cell 130 Sub cell 140 Bottom cushion 150 Sensor unit 152 Anode 154 Sensor cover 156 GND sheet 180 Pump 182 Pump unit 185 Operation panel

Claims

1. A determination device for determining a sleeping position of a user on an air mattress composed of a plurality of air cells, a pair of two capacitance-type detection units arranged at the left and right positions of the user in a plane adjacent to the air cell, and detecting the load received from the user at each position as a capacitance value, a storage unit that stores the capacitance values of the respective detection units measured for each of a plurality of sleeping positions on the air mattress as reference values, a determination unit that determines the sleeping position of the user by comparing the detection value of each detection unit with the reference value in the storage unit, A determination device comprising:

2. The determination device according to claim 1, wherein the storage unit stores the reference value in association with the weight and sleeping position of the user.

3. A determination device for determining a sleeping position of a user on an air mattress composed of a plurality of air cells, a pair of two capacitance-type detection units arranged at the left and right positions of the user in a plane adjacent to the air cell, and detecting the load received from the user at each position as a capacitance value, a determination unit that determines the side of the one detection unit as the sleeping position of the user when a value based on the detection value of one of the detection units is twice or more the value based on the detection value of the other detection unit, A determination device comprising:

4. A determination device for determining a sleeping position of a user on an air mattress composed of a plurality of air cells, a capacitance-type detection unit arranged at the central position of the user in a plane adjacent to the air cell, and detecting the load received from the user as a capacitance value, a weight information acquisition unit that acquires the weight information of the user, a storage unit that stores, for a plurality of reference users with different weights on the air mattress, a reference value based on the capacitance value when sleeping at the central sleeping position and a reference value of the capacitance when sleeping at the end sleeping position respectively, a determination unit that determines the sleeping position of the user by comparing the value based on the detection value of the detection unit and the weight information with each reference value in the storage unit, A determination device comprising:

5. The determination device according to claim 4, wherein the weight information acquisition unit estimates the weight of the user based on the exhaust time of the air cell and acquires the weight information.

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