Sofa bed

Abstract

To secure sufficient effective space for a dedicated space (for example, a nursing room) for breastfeeding and diaper changing, and to provide a comfortable environment for breastfeeding and diaper changing. [Solution] A sofa bed that can be configured into a sofa form and a bed form has a backrest in the sofa form, the backrest forms a bed seat in the bed form, and is equipped with a weight measurement sensor that measures the weight of a person being measured on the bed seat.

Description

Technical Field

[0001] The present invention relates to Sofa bed .

Background Art

[0002] When a mother with an infant goes out and needs to breastfeed or change the diaper, she uses a bed placed in a dedicated space (e.g., a nursing room) at the destination (e.g., a shopping mall). Some of these beds have a function to measure weight.

[0003] For example, Patent Document 1 discloses a technique for detecting the load of a subject on a bed.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] When the mother breastfeeds, she sits on the sofa. On the other hand, when the mother changes the diaper, she places the infant in the baby bed. However, since the seat surface of the baby bed is higher than that of the sofa, it is difficult for the mother to sit down for breastfeeding. That is, it is difficult for the baby bed to serve both purposes of breastfeeding and diaper changing. Therefore, with the technique of Patent Document 1, it is possible to measure the weight of the infant on the bed while changing the diaper, but it cannot be used for the purpose of breastfeeding.

[0006] In order to achieve both purposes of breastfeeding and diaper changing in the nursing room, it is necessary to arrange both a sofa and a bed. However, in the nursing room, since sufficient space is not secured, if both the sofa and the bed are arranged, the effective space of the nursing room will significantly decrease. As a result, the comfort of the nursing room will be impaired.

[0007] An object of the present invention is to sufficiently secure the effective space of a dedicated space (for example, a nursing room) for nursing and diaper changing, and to provide a comfortable environment for nursing and diaper changing.

Means for Solving the Problem

[0008] One aspect of the present invention is a sofa bed that can form a sofa form and a bed form, comprising a backrest in the sofa form, the backrest forms a bed seating surface in the bed form, and comprising a weight measurement sensor for measuring the weight of a person to be measured on the bed seating surface, which is a sofa bed.

Brief Description of the Drawings

[0009]

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Figure 10

Embodiments for Carrying Out the Invention

[0010] Each term in the present embodiment is used in the following meaning. · The "Z direction" is the vertical direction when the sofa bed 20 is arranged on a horizontal plane. · The "X direction" is the short side direction of the second surface (bed seating surface) 26b of the sofa bed 20. The X direction is orthogonal to the Z direction. · The "Y direction" is the long side direction of the second surface (bed seating surface) 26b of the sofa bed 20. The Y direction is orthogonal to the X direction and the Z direction.

[0011] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the drawings for explaining the embodiment, the same components are generally denoted by the same reference numerals, and the repeated description thereof will be omitted.

[0012] (1) Configuration of the Information Processing System The configuration of the information processing system will be described. FIG. 1 is a block diagram showing the configuration of the information processing system according to the present embodiment. FIG. 2 is a functional block diagram of the information processing system of FIG. 1.

[0013] As shown in FIG. 1, the information processing system 1 includes a client device 10, a sofa bed 20, a server 30, and a nursing room unit 40. The client device 10, the sofa bed 20, and the server 30 are connected via a network (for example, the Internet or an intranet) NW.

[0014] The client device 10 is a computer (an example of an "information processing device") that transmits a request to the server 30. The client device 10 is, for example, a smartphone, a tablet terminal, or a personal computer.

[0015] The sofa bed 20 is arranged inside the nursing room unit 40. The sofa bed 20 alternatively forms a sofa form and a bed form. The sofa bed 20 is configured to measure the weight of the person to be measured T (for example, an infant). The sofa bed 20 is arranged, for example, inside the nursing room unit 40.

[0016] The server 30 is a computer (an example of an "information processing device") that provides a response according to a request transmitted from the client device 10 to the client device 10. The server 30 is, for example, a web server.

[0017] The nursing room unit 40 forms a closed space (that is, a private room) that cannot be visually recognized from the outside.

[0018] (1-1) Configuration of the client device The configuration of the client device 10 will be described.

[0019] As shown in FIG. 2, the client device 10 includes a storage device 11, a processor 12, an input / output interface 13, and a communication interface 14.

[0020] The storage device 11 is configured to store programs and data. The storage device 11 is, for example, a combination of a ROM (Read Only Memory), a RAM (Random Access Memory), and a storage (for example, a flash memory or a hard disk).

[0021] The program includes, for example, the following programs. · Program of the OS (Operating System) · Program of an application (for example, a web browser) that executes information processing

[0022] The data includes, for example, the following data. · Database referred to in information processing · Data obtained by executing information processing (i.e., the execution result of information processing)

[0023] The processor 12 is configured to realize the functions of the client device 10 by starting the program stored in the storage device 11. The processor 12 is, for example, a CPU (Central Processing Unit), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or a combination thereof.

[0024] The input / output interface 13 is configured to obtain a user instruction from an input device connected to the client device 10 and output information to an output device connected to the client device 10. The input device is, for example, a keyboard, a pointing device, a touch panel, or a combination thereof. The output device is, for example, a display.

[0025] The communication interface 14 is configured to control communication between the client device 10 and the sofa bed 20 and the server 30.

[0026] (1-2) Configuration of the sofa bed The configuration of the sofa bed 20 will be described. FIG. 3 is a diagram showing the structure of the sofa bed of FIG. 1. FIG. 4 is a perspective view of the bed form of the sofa bed of FIG. 1.

[0027] As shown in FIG. 2, the sofa bed 20 includes a storage device 21, a processor 22, an input / output interface 23, a communication interface 24, and a weight measurement sensor 25.

[0028] The storage device 21 is configured to store programs and data. The storage device 21 is, for example, a combination of a ROM, a RAM, and a storage (e.g., a flash memory or a hard disk).

[0029] The program includes, for example, the following programs. · The program of the OS · The program of the application that executes information processing

[0030] The data includes, for example, the following data. · The database referenced in information processing · The execution result of information processing

[0031] The processor 22 is configured to realize the functions of the sofa bed 20 by starting the program stored in the storage device 21. The processor 22 is, for example, a CPU, an ASIC, an FPGA, or a combination thereof.

[0032] The input / output interface 23 is configured to obtain a user's instruction from an input device connected to the sofa bed 20 and output information to an output device connected to the sofa bed 20. The input device is, for example, a keyboard, a pointing device, a touch panel, a body weight measurement sensor 25, or a combination thereof. The output device is, for example, a display, a speaker, or a combination thereof.

[0033] The communication interface 24 is configured to control communication between the sofa bed 20, the client device 10, and the server 30.

[0034] The body weight measurement sensor 25 is configured to measure the weight of the person T to be measured. The body weight measurement sensor 25 is in a non-measurable state in the sofa form and in a measurable state in the bed form. The body weight measurement sensor 25 is, for example, a load sensor (as an example, a load cell sensor).

[0035] As shown in FIG. 3, the sofa bed 20 forms a sofa form (FIG. 3A) and a bed form (FIG. 3B).

[0036] As shown in FIG. 3A, the sofa bed 20 includes a backrest 26, a support portion 27, a seat portion 28, and a plurality of legs 29.

[0037] The backrest 26 extends in the Z direction. The backrest 26 has a first surface 26a and a second surface 26b. The first surface 26a is located on the X+ side in the sofa form. The first surface 26a supports the back of the user U sitting on the seat portion 28 in the sofa form. The second surface 26b is located on the opposite side (X− side) of the first surface 26a in the sofa form. The backrest 26 is configured to be rotatable clockwise or counterclockwise in FIG. 3A about the rotation axis R. A plurality of body weight measurement sensors 25 are arranged inside the backrest 26.

[0038] The support portion 27 is configured to connect the backrest 26, the seat portion 28, and at least one leg 29. The support portion 27 extends in the Z direction.

[0039] The surface on the Z+ side of the seat portion 28 (hereinafter referred to as the “upper surface”) forms a seat surface of the sofa form (hereinafter referred to as the “sofa seat surface”) 28a. The seat portion 28 supports the user U sitting on the seat portion 28 in the sofa form. The seat portion 28 extends in the X direction.

[0040] Each leg 29 is configured to support the support portion 27 and the seat portion 28. The legs 29 extend in the Z direction.

[0041] When the backrest 26 in FIG. 3A rotates clockwise, the backrest 26 stops at a position where the second surface 26b on the X− side of the backrest 26 is higher than the sofa seat surface 28a (a position on the Z+ side). When the rotation of the backrest 26 stops, the sofa bed 20 forms a bed form (FIG. 3B). The second surface 26b forms a seat surface of the bed form (hereinafter referred to as the “bed seat surface”). The second surface 26b supports the measurement target person T in the bed form.

[0042] As shown in FIG. 3, a plurality of body weight measurement sensors 25 are arranged inside the backrest 26. As shown in FIG. 4, a plurality of body weight measurement sensors 25 are located around the corners of the backrest 26 that forms the XY plane in the bed form. While the second surface (bed seating surface) 26b supports the measurement subject T, the body weight measurement sensor 25 measures the load applied by the measurement subject T to the second surface (bed seating surface) 26b.

[0043] (1-3) Configuration of the server The configuration of the server 30 will be described.

[0044] As shown in FIG. 2, the server 30 includes a storage device 31, a processor 32, an input / output interface 33, and a communication interface 34.

[0045] The storage device 31 is configured to store programs and data. The storage device 31 is, for example, a combination of a ROM, a RAM, and a storage (e.g., flash memory or hard disk).

[0046] The program includes, for example, the following programs. · Program of the OS · Program of an application that executes information processing

[0047] The data includes, for example, the following data. · Database referred to in information processing · Execution result of information processing

[0048] The processor 32 is configured to realize the functions of the server 30 by starting the programs stored in the storage device 31. The processor 32 is, for example, a CPU, an ASIC, an FPGA, or a combination thereof.

[0049] The input / output interface 33 is configured to obtain a user's instruction from an input device connected to the server 30 and output information to an output device connected to the server 30. The input device is, for example, a keyboard, a pointing device, a touch panel, or a combination thereof. The output device is, for example, a display.

[0050] The communication interface 34 is configured to control communication between the server 30 and the client device 10.

[0051] (1-4) Configuration of the nursing room unit The configuration of the nursing room unit 40 will be described. FIG. 5 is a diagram showing the external configuration (FIG. 5A) and the internal configuration (FIG. 5B) of the nursing room unit of FIG. 1.

[0052] As shown in FIG. 5, the nursing room unit 40 includes a door 41 and casters 42.

[0053] As shown in FIG. 5A, the door 41 is configured to be openable and lockable. The door 41 is disposed in a first region 40a (the dashed-two dotted line in FIG. 5A) on one side portion side (for example, the X+ side) with respect to the center line C (the dashed line in FIG. 5A) of one side surface of the nursing room unit 40. Thereby, even when the door 41 is opened, the inside of the second region 40b (the dashed-two dotted line) on the other side portion side (for example, the X− side) with respect to the center line C is located in a blind spot from the outside of the nursing room unit 40. After the user (for example, the protector of the measurement target person T) opens the door 41 and enters the inside of the nursing room unit 40, when the door 41 is closed and locked, the inside of the nursing room unit 40 is blocked from the outside (that is, it becomes a space where a third party cannot visually recognize). Thereby, the privacy inside the nursing room unit 40 can be protected.

[0054] The casters 42 are disposed at the lower part of the nursing room unit 40. The casters 42 are configured to be rotatable. Thereby, the nursing room unit 40 can be easily moved. That is, the nursing room unit 40 is a mobile nursing room unit.

[0055] As shown in FIG. 5B, the sofa bed 20 is disposed in the second region 40b inside the nursing room unit 40. Specifically, the sofa bed 20 is arranged such that in the sofa form, the second surface 26b faces the inner wall 40c of the second region 40b. Thereby, the sofa bed 20 is located in a blind spot from the outside of the nursing room unit 40 when the door 41 is open.

[0056] (2) Outline of the Embodiment The outline of this embodiment will be described. FIG. 6 is an explanatory diagram of the outline of this embodiment.

[0057] As shown in FIG. 6, the sofa bed 20 is disposed in the nursing room unit 40.

[0058] When a user U in the nursing room unit 40 changes the sofa bed 20 from the sofa form to the bed form, for example, for changing a diaper, and places the measurement target person T (for example, an infant) on the sofa bed 20 in the bed form, the weight measurement sensor 25 measures the weight of the measurement target person T. The measurement result of the weight measurement sensor 25 and the marker image Q are displayed on a display disposed in the nursing room unit 40.

[0059] When the user U uses a camera (not shown) of the client device 10 to photograph the marker image Q displayed on the display, the client device 10 transmits a request to the server 30 to obtain the history of the measurement results of the weight of the measurement target person T.

[0060] The server 30 causes the client device 10 to display the history of the measurement results of the weight of the measurement target person T in response to the request of the client device 10.

[0061] Thereby, the user U can know the latest weight of the measurement target person T and the history of the measurement results of the weight while changing the diaper of the measurement target person T on the sofa bed 20.

[0062] (3) Database The database of this embodiment will be described. The following database is stored in the storage device 31.

[0063] (3-1) User Information Database The user information database of this embodiment will be described. FIG. 7 is a diagram showing the data structure of the user information database of this embodiment.

[0064] User information is stored in the user information database of FIG. 7. User information is information about the user. The user information database includes a "User ID" field, a "User Name" field, a "User Attribute" field, and a "Measurement Target Person" field. Each field is associated with each other.

[0065] User identification information (an example of "guardian identification information") is stored in the "User ID" field. User identification information is information for identifying the user.

[0066] User name information is stored in the "User Name" field. User name information is information regarding the name of the user (for example, the full name).

[0067] User attribute information is stored in the "User Attribute" field. User attribute information is information regarding the attributes of the user. The "User Attribute" field includes a "Gender" field and an "Age" field.

[0068] Gender information is stored in the "Gender" field. Gender information is information regarding the gender of the user.

[0069] Age information is stored in the "Age" field. Age information is information regarding the age of the user.

[0070] Measurement target information is stored in the "Measurement target" field. The measurement target information is information about the measurement target T. The "Measurement target" field includes a "Measurement target ID" field, a "Measurement target name" field, a "Gender" field, and an "Age in months" field.

[0071] Measurement target identification information is stored in the "Measurement target ID" field. The measurement target identification information is information for identifying the measurement target T. One user identification information is associated with one or more measurement target identification information.

[0072] Measurement target name information is stored in the "Measurement target name" field. The measurement target name information is information about the name (e.g., full name) of the measurement target T. The "Measurement target name" field is associated with one measurement target identification information.

[0073] Gender information is stored in the "Gender" field. The gender information is information about the gender of the measurement target T. The "Gender" field is associated with one measurement target identification information.

[0074] Age in months information is stored in the "Age in months" field. The age in months information is information about the age in months of the measurement target T. The "Age in months" field is associated with one measurement target identification information.

[0075] (3-2) Measurement result information database The measurement result information database of this embodiment will be described. FIG. 8 is a diagram showing the data structure of the measurement result information database of this embodiment.

[0076] Measurement result information is stored in the measurement result information database shown in FIG. 8. The measurement result information is information about the measurement result. The measurement result information database includes a "Timestamp" field and a "Weight" field. Each field is associated with each other. The measurement result information database is associated with the measurement target identification information.

[0077] The "timestamp" field stores measurement date and time information. The measurement date and time information is information regarding the date and time when the measurement was performed.

[0078] The "weight" field stores weight information. The weight information is information regarding the measurement result of the weight of the person to be measured, T.

[0079] (4) Information processing The information processing of the present embodiment will be described. The information processing is measurement processing performed by a weight measurement sensor 25 disposed on the sofa bed 20. FIG. 9 is a sequence diagram of the measurement processing of the present embodiment. FIG. 10 is a diagram showing an example of a screen displayed in the information processing of FIG. 9.

[0080] The trigger for the processing in FIG. 9 is, for example, as shown in FIG. 10, that the user U places the person to be measured, T, on the second surface (bed seating surface) 26b.

[0081] The sofa bed 20 executes detection of the bed form (S120). Specifically, when the backrest 26 satisfies a predetermined condition, the processor 22 changes the weight measurement sensor 25 to a measurable state. The predetermined condition is, for example, at least one of the following. · The rotation angle of the backrest 26 has reached a predetermined angle (for example, the XY plane of the backrest 26 is horizontal). · The rotation of the backrest 26 has stopped.

[0082] After step S120, the sofa bed 20 executes measurement (S121). Specifically, a weight model is stored in the storage device 21. In the weight model, the correlation between the load applied by the person to be measured, T, on the second surface (bed seating surface) 26b and the weight of the person to be measured, T, is described. The weight measurement sensor 25 measures the load of the person to be measured, T, supported by the second surface (bed seating surface) 26b. The processor 22 calculates the weight of the person T to be measured by inputting the load measured by the weight measurement sensor 25 into the weight model.

[0083] After step S121, the sofa bed 20 executes the transmission of the measurement result (S122). Specifically, the processor 22 transmits the following information to the server 30. · Identification information of the person T to be measured · Information regarding the execution date and time of step S121 (i.e., measurement date and time information) · Weight information regarding the weight obtained in step S121

[0084] After step S122, the server 30 executes the update of the database (S130). Specifically, the processor 32 adds a new record to the measurement result information database (Fig. 8) associated with the identification information of the person to be measured transmitted in step 122. The following information is stored in each field of the new record. · "Timestamp" field: The measurement date and time information transmitted in step S122 · "Weight" field: The weight information transmitted in step S122

[0085] After step S122, the sofa bed 20 executes the display of the measurement result (S123). Specifically, the processor 22 displays the screen P20 (Fig. 10) on the display. The display is, for example, at least one of the following. · A display connected to the input / output interface 13 (i.e., a display arranged in the client device 10) · A display connected to the input / output interface 23 (i.e., a display arranged in the sofa bed 20) · A display arranged in the nursing room unit 40

[0086] The screen P20 includes a display object A20 and an image object IMG20.

[0087] The following information is displayed for object A20. · Measurement date and time information (e.g., information regarding the execution date and time of step S121) · Weight information obtained in step S121

[0088] The image object IMG20 is a marker image. The measurement subject identification information of the measurement subject T is embedded in the marker image. The marker image includes, for example, at least one of the following. · One-dimensional barcode image · Two-dimensional barcode image

[0089] After step S123, the client device 10 executes photographing of the marker image (S110). Specifically, when the user U uses the camera of the client device 10 to photograph the marker image displayed in step S123, the processor 12 identifies the measurement subject identification information embedded in the marker image.

[0090] After step S110, the client device 10 executes a history display request (S111). Specifically, the processor 12 transmits history display request data to the server 30. The history display request data includes, for example, the following information. · Measurement subject identification information obtained in step S110

[0091] After step S111, the server 30 executes identification of the target measurement history (S131). Specifically, the processor 32 identifies the measurement result information database (Figure 8) associated with the measurement subject identification information included in the history display request data transmitted in step S111. The processor 32 identifies records in the measurement result information database that satisfy a predetermined condition (e.g., all records, or records corresponding to the measurement date and time information for a predetermined period (for example, three months) retroactively from the execution date and time of step S131). The processor 32 refers to the user information database (Figure 7) to identify the name information of the person to be measured associated with the identification information of the person to be measured.

[0092] After step S131, the server 30 executes a history display response (S132). Specifically, the processor 32 transmits the history display response data to the client device 10. The history display response data includes the following information. · Information of the record identified in step S131 · Name information of the person to be measured identified in step S131

[0093] After step S132, the client device 10 executes a display of the measurement history (S112). Specifically, the processor 12 displays the screen P10 (Figure 10) on the display.

[0094] The screen P10 includes the name information of the person to be measured and the record information (i.e., measurement date and time information and weight information) transmitted in step S132, and the identification information of the person to be measured.

[0095] (5) Parentheses in this embodiment According to this embodiment, a sofa bed 20 provided with a weight measurement sensor 25 is provided. Thereby, sufficient effective space of the nursing room unit 40 can be secured, and a comfortable environment for nursing and for changing diapers or measuring weight can be provided.

[0096] According to this embodiment, the weight measurement sensor 25 is in a non-measurable state in the sofa form and in a measurable state in the bed form. Thereby, the user U can measure the weight of the person to be measured T only by deforming the sofa bed 20 from the sofa form to the bed form without performing a predetermined operation.

[0097] According to this embodiment, the second surface (bed seating surface) 26b is located at a position higher than the sofa seating surface 28a in the bed form. Thereby, the sofa bed 20 forms both a sofa form for breastfeeding and a bed form for diaper changing or weighing. As a result, sufficient effective space of the nursing room unit 40 can be secured, and a comfortable environment for breastfeeding and diaper changing or weighing can be provided.

[0098] According to this embodiment, the measurement result of the weighing sensor 25 is displayed on the display. Thereby, the user U can easily know the weight of the measurement target person T while changing the diaper.

[0099] According to this embodiment, the measurement result of the weighing sensor 25 is stored in the server 30. Thereby, the user U can easily save the history of the measurement results of the weight of the measurement target person T.

[0100] According to this embodiment, a marker image Q for acquiring the history of the measurement results of the weighing sensor 25 is displayed on the display. Thereby, the user U can easily know the history of the measurement results of the weight of the measurement target person T.

[0101] According to this embodiment, the nursing room unit 40 includes a sofa bed 20, a door 41, and casters 42. The sofa bed 20 is disposed on the side of the nursing room unit 40 opposite to the side where the door 41 is disposed. Thereby, when the door 41 is opened, the sofa bed 20 can be positioned in a blind spot from the outside of the nursing room unit 40.

[0102] The measurement result of the weighing sensor 25 is displayed on the display disposed in the nursing room unit 40. Thereby, the user U can easily know the weight of the measurement target person T while changing the diaper.

[0103] According to this embodiment, a server 30 capable of communicating with a sofa bed 20 stores by associating measurement target person identification information with a measurement result of a weight measurement sensor 25 (that is, weight information). Thereby, the history of the measurement results of the weight of the measurement target person T can be easily stored.

[0104] According to this embodiment, the server 30 causes the client device 10 to display a history of measurement results associated with the measurement target person identification information obtained from the client device 10. Thereby, the user U can easily obtain the history of the measurement results of the weight of the measurement target person T.

[0105] According to this embodiment, the bed seating surface is positioned higher than the sofa seating surface in the bed form. Thereby, the sofa bed 20 forms both a sofa form for breastfeeding and a bed form for diaper changing. As a result, a sufficient effective space of the nursing room unit 40 can be secured, and a comfortable environment for breastfeeding and diaper changing can be provided.

[0106] (6) Other Modification Examples Other modification examples will be described.

[0107] The storage device 11 may be connected to the client device 10 via the network NW. The storage device 21 may be connected to the sofa bed 20 via the network NW. The storage device 31 may be connected to the server 30 via the network NW.

[0108] Each step of the above information processing can be executed by any of the client device 10, the sofa bed 20, and the server 30. For example, when the client device 10 can execute all steps of the above information processing, the client device 10 functions as a stand-alone information processing device without transmitting a request to the server 30. For example, when the sofa bed 20 can execute all the steps of the above information processing, the sofa bed 20 functions as an information processing device that operates stand-alone without sending a request to the server 30.

[0109] As described above, the embodiments of the present invention have been described in detail, but the scope of the present invention is not limited to the above embodiments. Also, the above embodiments can be variously improved and modified without departing from the gist of the present invention. Further, the above embodiments and modifications can be combined.

Explanation of Reference Numerals

[0110] 1: Information processing system 10: Client device 11: Storage device 12: Processor 13: Input / output interface 14: Communication interface 20: Sofa bed 21: Storage device 22: Processor 23: Input / output interface 24: Communication interface 25: Body weight measurement sensor 26: Backrest 26b: Back surface (bed seating surface) 27: Support part 28: Seat part 28a: Sofa seating surface 29: Leg part 30: Server 31: Storage device 32: Processor 33: Input / output interface 34: Communication interface 40: Nursing room unit 41: Door 42: Caster

Claims

1. A sofa bed capable of forming a sofa form and a bed form, comprising a seat portion that forms a sofa seat surface in the sofa form, comprising a backrest in the sofa form, the backrest forms a bed seat surface in the bed form, the bed seat surface is located at a position higher than the sofa seat surface so that a space is formed between the bed seat surface and the sofa seat surface in the bed form, comprising a weight measurement sensor that measures the weight of a person to be measured on the bed seat surface, the weight measurement sensor, is disposed inside the backrest, is in a non-measurable state in the sofa form, and becomes in a measurable state in the bed form, sofa bed.

2. The weight measurement sensor becomes in the measurable state when the bed seat surface is located at a position higher than the sofa seat surface. The sofa bed according to Claim 1.

3. The weight measurement sensor measures the load applied by the person to be measured to the bed seat surface while the bed seat surface supports the person to be measured. The sofa bed according to Claim 1 or Claim 2.

4. Comprising means for detecting the bed form, and comprising means for changing the weight measurement sensor to the measurable state when the bed form is detected. The sofa bed according to any one of Claims 1 to 3.

5. The weight measurement sensor includes a plurality of weight measurement sensors, and the plurality of weight measurement sensors are disposed around the corners of the backrest. The sofa bed according to any one of Claims 1 to 4.

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