Door opening / closing recognition device

Abstract

To provide a use state notification device capable of adding a function to notify a communication terminal of a use state, with respect to a refrigerator which does not include a communication function.SOLUTION: A use state notification device includes a mounting part, a wireless communication part, a door opening / closing recognition part, and a notification control part. The mounting part mounts the use state notification device on an exterior part of a refrigerator. The wireless communication part performs wireless communication between itself and a communication terminal. The door opening / closing recognition part recognizes an opening / closing state of the refrigerator. The communication control part transmits use information of the refrigerator based on the door opening / closing state of the refrigerator to the communication terminal by the wireless communication part.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a refrigerator. Door opening / closing recognition device that recognizes the opening / closing state of the door Regarding. [Background technology]

[0002] Patent Document 1 discloses a monitoring system that monitors the living conditions of a person being watched over, who is a user of a refrigerator, based on changes in the amount of ingredients in the refrigerator. The refrigerator that constitutes this monitoring system includes a sensor that detects the amount of ingredients in the refrigerator, and a communication unit that transmits data on the amount of ingredients detected by the sensor to a communication terminal of a person being watched over who monitors the living conditions of the person being watched over. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2019 / 058590 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above monitoring system, the refrigerator's communication function is used to transmit data on the amount of ingredients to the monitoring person's communication terminal. Therefore, if the person being monitored uses a refrigerator that does not have a communication function, there is an inconvenience in that the function of notifying the monitoring person's communication terminal of the refrigerator's usage status cannot be realized.

[0005] In view of this background, the present disclosure provides: Door opening / closing detection means For refrigerators that do not have Recognizes whether the door is open or closed To provide a door opening / closing recognition device to which functions can be added. [Means for solving the problem]

[0006] A door opening / closing recognition device according to the present disclosure is a door opening / closing recognition device that is attached to a top surface of an exterior part of a refrigerator and is used, the door opening / closing recognition device including: a mounting part that is provided on a bottom surface of the door opening / closing recognition device and fixes the door opening / closing recognition device to the top surface; a sensor that detects an object present within a detection area on the front surface of the refrigerator from the top surface with the door opening / closing recognition device attached to the top surface; and a door opening / closing recognition part that recognizes an open / closed state of the refrigerator door based on a detection result of the sensor. a wireless communication unit that performs wireless communication; and a notification control unit that transmits information based on a recognition result of the open / closed state of the door recognized by the door open / close recognition unit through the wireless communication unit; Equipped with. Effect of the Invention

[0007] In this disclosure Door opening / closing detection unit The exterior of the refrigerator Top of By attaching it to No door opening / closing detection means For the refrigerator, Recognizes whether the door is open or closed It is possible to add a function to [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is an explanatory diagram of a usage mode of the usage status notification device according to the embodiment; [Diagram 2] FIG. 1 is a diagram showing the configuration of a usage status notification device according to an embodiment. [Diagram 3] FIG. 2 is an explanatory diagram of the attachment mode of the usage status notification device and the detection range of the distance measuring sensor according to the embodiment; [Figure 4] Flowchart of forgetting to close notification process in the embodiment [Diagram 5] Flowchart of monitoring notification processing in an embodiment DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] (The knowledge and other information that formed the basis of this disclosure) At the time when the inventors came up with the present disclosure, notification of the usage status of the refrigerator was performed using a sensor and a communication function that were already installed in the refrigerator. That is, the amount of ingredients in the refrigerator was detected by the sensor, and the data on the amount of ingredients detected by the sensor was transmitted to a communication terminal of a watcher or the like who monitors the living conditions of the person being watched. However, some refrigerators available on the market do not have a communication function, and the inventors have found a problem that, for refrigerators that do not have a communication function, the above configuration cannot be applied to transmit the refrigerator's usage status to a communication terminal. In order to solve this problem, the inventors have come up with the subject matter of the present invention. In view of this, the present disclosure provides a usage status notifying device that makes it possible to add a function of notifying a communication terminal of its usage status to a refrigerator that does not have a communication function.

[0010] Hereinafter, the embodiments will be described in detail with reference to the drawings. However, more detailed explanation than necessary may be omitted. For example, detailed explanation of already well-known matters or duplicate explanation of substantially the same configuration may be omitted. This is to avoid the following explanation becoming more redundant than necessary and to facilitate understanding by those skilled in the art. It should be noted that the accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

[0011] (Embodiment) Hereinafter, the embodiment will be described with reference to FIGS. 1 to 5. FIG. [1. Configuration] [1-1. Usage of the usage status notification device] A usage mode of a usage status notification device 1 according to the present disclosure will be described with reference to Fig. 1. The usage status notification device 1 is attached to a top surface 120 of an exterior part of a refrigerator 110 placed in a house 100. The usage status notification device 1 includes a distance measurement sensor 31 whose detection area is near the front surface of the refrigerator 110, and has a wireless communication function via Wi-Fi (registered trademark).

[0012] The house 100 is equipped with a Wi-Fi router 150. The usage status notification device 1 performs wireless communication with a user terminal 91 used by a user U residing in the house 100 and a smart speaker 160 used in the house 100 via the Wi-Fi router 150. Note that wireless communication between the usage status notification device 1 and the user terminal 91 and smart speaker 160 may be performed using a communication standard other than Wi-Fi, such as Bluetooth (registered trademark). The user terminal 91 and smart speaker 160 correspond to the communication terminals of the present disclosure.

[0013] Furthermore, the usage status notifying device 1 performs wireless communication with the management server 300 and a related party terminal 92 used by a related party R who has a predetermined relationship with the user U, via the Wi-Fi router 150 and the communication network 200. The configuration in which the management server 300 performs communication and the related party terminal 92 correspond to the communication terminal of the present disclosure.

[0014] The usage status notification device 1 recognizes the open / closed state of the door of the refrigerator 110 based on detection data (distance measurement data) of the distance to an object located within the detection area by the distance measurement sensor 31. Then, the usage status notification device 1 transmits usage information of the refrigerator 110 based on the open / closed state of the door of the refrigerator 110 to the user terminal 91, the smart speaker 160, the related party terminal 92, and the management server 300.

[0015] In this embodiment, when the door of the refrigerator 110 has been open for a predetermined forget-to-close determination time or longer, the usage status notifying device 1 transmits door-forgotten-close information notifying that the door has been left open to the smart speaker 160 and the user terminal 91. When the smart speaker 160 receives the door-forgot-to-close information, it outputs a voice message such as "The refrigerator door is open" to notify that the door of the refrigerator 110 is open. When the user terminal 91 receives the door-forgot-to-close information, it displays a notification screen notifying that the door of the refrigerator 110 is open and outputs a voice notifying that the door of the refrigerator 110 is open.

[0016] Furthermore, when the door of the refrigerator 110 remains unopened for a predetermined non-use determination time or longer, the usage status notifying device 1 transmits user abnormality information notifying an abnormality of the user U to the related party terminal 92 and the management server 300. When the related party terminal 92 receives the user abnormality information, it displays a screen prompting the user U to confirm his / her safety, etc.

[0017] The management server 300 includes a usage status DB (Data Base) 310 and a notification destination DB 311. The management server 300 receives user abnormality information transmitted from the usage status notification device 1 via the communication network 200, and records the received user abnormality information in the usage status DB 310. The notification destination DB 311 records the communication addresses of communication terminals such as emergency facilities that are registered in advance as notification destinations of abnormalities of the user U. When the management server 300 receives the user abnormality information, it transmits rescue request information including information on the user U, the address of the house 100, and the like, to the communication terminal of the emergency facility, etc., to request rescue of the user U.

[0018] [1-2. Configuration of the usage notification device] 2 and 3, the configuration of the usage status notification device 1 will be described. The usage status notification device 1 includes a controller 10, a distance measurement sensor 31, a communicator 50, a setting switch 55, an external power port 60, a power circuit 61, and an attachment unit 70. The communicator 50 corresponds to the wireless communication unit of the present disclosure.

[0019] As shown in Fig. 3, mounting unit 70 is provided on the bottom surface of usage status notification device 1 and fixes usage status notification device 1 to top surface 120 of the exterior of refrigerator 110. Mounting unit 70 fixes usage status notification device 1 to top surface 120 of refrigerator 110 by, for example, a magnet, a suction cup, double-sided tape, etc. Distance measurement sensor 31 detects the distance from the vicinity of top surface 120 to an object present within detection area Ar near the front surface of refrigerator 110 when usage status notification device 1 is attached to top surface 120 of refrigerator 110 as shown in Fig. 3.

[0020] 3, refrigerator 110 has door-type right and left refrigerator doors 111 and 112, and drawer-type first freezer door 113, ice-making door 114, second freezer door 115, and vegetable compartment door 116. The distance detected by distance measuring sensor 31 differs between when any of the doors is in a closed state and when it is in an open state. Therefore, by detecting the displacement of the doors of refrigerator 110 based on the distance measuring signal from distance measuring sensor 31, it is possible to recognize that any of the doors of refrigerator 110 is in an open state or that all of the doors of refrigerator 110 are in a closed state.

[0021] As described above, the communicator 50 performs wireless communication using Wi-Fi, Bluetooth, or the like. The external power port 60 is connected to a commercial power outlet provided in the house 100 or a USB (Universal Serial Bus, registered trademark) terminal provided in the refrigerator 110, and supplies power to a power supply circuit 61. The power supply circuit 61 rectifies and transforms the power supplied from the external power supply port, and supplies operating power to the controller 10, the communicator 50, and the distance measurement sensor 31. Note that a configuration in which power is supplied to the power supply circuit 61 from a battery 63 may also be used. The setting switch 55 is provided for performing operations such as registering the usage status notification device 1 to the Wi-Fi router 150.

[0022] The controller 10 includes a processor 20, a memory 40, and an interface circuit (not shown). The processor 20 includes one or more core processors. The memory 40 stores a control program 41 for the usage status notification device 1 and user data 42. The user data 42 records communication addresses of the user terminal 91, the smart speaker 160, the related party terminal 92, and the management server 300. These communication addresses are set by a usage app (application program) of the usage status notification device 1 executed on the user terminal 91 or the related party terminal 92.

[0023] The processor 20 reads and executes the control program 41 stored in the memory 40, thereby functioning as the door open / closed recognition processing unit 21 and the notification control unit 22. The door open / closed recognition processing unit 21 executes a process for recognizing the open / closed states of the doors 111-116 of the refrigerator 110 based on the distance measurement data output from the distance measurement sensor 31. The door open / closed recognition processing unit 21 and the distance measurement sensor 42 constitute the door open / closed recognition unit 30 that recognizes the open / closed states of the doors 111-116.

[0024] The notification control unit 22 executes a door-forgot-to-close notification process for transmitting the above-mentioned door-forgot-to-close information and a user-abnormality notification process for transmitting the above-mentioned user-abnormality information based on the recognition result of the open / closed states of the doors 111 to 116 by the door-open / close recognition unit 30. The door-forgot-to-close notification process and the user-abnormality notification process will be described later in detail.

[0025] [2. Operation] The operation of the usage status notification device 1, which is executed by the door opening / closing recognizing section 30 and the notification control section 22, will be described with reference to the flowcharts shown in FIGS.

[0026] [2-1. Door Forgotten to Close Notification Processing] The door-forgot-to-close notification process will be described with reference to the flowchart shown in Fig. 4. The door-open / close recognizing unit 30 and the notification control unit 22 repeatedly execute the door-forgot-to-close notification process according to the flowchart shown in Fig. 4 while the usage status notification device 1 is in operation.

[0027] 4, the door open / closed state recognizing unit 30 detects the distance to an object in the detection area Ar by the distance measuring sensor 31. In the following step S2, the door open / closed state recognizing unit 30 recognizes the open / closed state of the doors 111-116 of the refrigerator 110 based on the distance measurement data by the distance measuring sensor 31. Hereinafter, when all of the doors 111-116 of the refrigerator 110 are closed, the door of the refrigerator 110 is said to be in the closed state, and when at least one of the doors 111-116 of the refrigerator 110 is in the open state, the door of the refrigerator 110 is said to be in the open state.

[0028] In the next step S3, the notification control unit 22 judges whether or not the door opening / closing recognizing unit 30 recognizes that the door of the refrigerator 110 has been switched from a closed state to an open state. If the notification control unit 22 recognizes that the door of the refrigerator 110 has been switched from a closed state to an open state, the notification control unit 22 proceeds to step S4. On the other hand, if the notification control unit 22 does not recognize that the door of the refrigerator 110 has been switched from a closed state to an open state, the notification control unit 22 proceeds to step S1.

[0029] In step S4, the notification control unit 22 starts a forget-to-close timer when the door of the refrigerator 110 switches from a closed state to an open state. The set time of the forget-to-close timer (foreign-to-close determination time) is, for example, three minutes. In the following step S5, the door open / close recognizing unit 30 recognizes the open / closed states of the doors 111-116 of the refrigerator 110 based on the distance measurement data by the distance measurement sensor 31.

[0030] In the next step S7, the notification control unit 22 judges whether or not the door opening / closing recognizing unit 30 has recognized that the door of the refrigerator 110 has switched from an open state to a closed state. If the notification control unit 22 has recognized that the door of the refrigerator 110 has switched from an open state to a closed state, the notification control unit 22 advances the process to step S8 and ends the process according to the flowchart in Fig. 4. On the other hand, if the notification control unit 22 has not recognized that the door of the refrigerator 110 has switched from an open state to a closed state, the notification control unit 22 advances the process to step S10.

[0031] In step S10, the notification control unit 22 judges whether the forget-to-close timer has timed out (whether the forget-to-close determination time has elapsed). If the forget-to-close timer has timed out, the notification control unit 22 proceeds to step S11, and if the forget-to-close timer has not timed out, the notification control unit 22 proceeds to step S5. In step S11, the notification control unit 22 transmits door-forgotten-to-close information notifying that the door of the refrigerator 110 is open to the user terminal 91 and smart speaker 160 via the communicator 50, and proceeds to step S9 in Fig. 5. As a result, in the user terminal 91 and smart speaker 160 that have received the door-forgotten-to-close information, the process of notifying that the door of the refrigerator 110 has been left closed is executed as described above.

[0032] [2-2. User Abnormality Notification Processing] The user abnormality notification process will be described with reference to the flowchart shown in Fig. 5. The notification control unit 22 and the door open / close recognizing unit 30 execute the user abnormality notification process according to the flowchart in Fig. 5 every time the door open / close recognizing unit 30 recognizes that the door of the refrigerator 110 has switched from the open state to the closed state.

[0033] 5, the notification control unit 22 starts a monitoring timer. The set time of the monitoring timer is, for example, 24 hours. In the following step S31, the door opening / closing recognition unit 30 detects the distance to an object in the detection area Ar by the distance measurement sensor 31. In the next step S32, the door opening / closing recognition unit 30 recognizes the open / closed state of the door of the refrigerator 110 based on the distance measurement data by the distance measurement sensor 31.

[0034] In the next step S33, the notification control unit 22 judges whether or not the door opening / closing recognizing unit 30 has recognized that the door of the refrigerator 110 has switched from a closed state to an open state. If the notification control unit 22 has recognized that the door of the refrigerator 110 has switched from a closed state to an open state, the notification control unit 22 proceeds to the process of step S34. On the other hand, if the notification control unit 22 has not recognized that the door of the refrigerator 110 has switched from a closed state to an open state, the notification control unit 22 proceeds to the process of step S40.

[0035] In step S40, the notification control unit 22 determines whether the watch timer has timed out. If the watch timer has timed out, the notification control unit 22 proceeds to step S42, and if the watch timer has not timed out, the notification control unit 22 proceeds to step S31.

[0036] In step S42, the notification control unit 22 transmits user abnormality information notifying that an abnormality may have occurred in the user U to the related party terminal 92 and the management server 300 via the communicator 50, and proceeds to step S37. As a result, the related party terminal 92 and the management server 300 execute the process of notifying the related party of the abnormality of the user U and prompting the user U to confirm his / her safety, as described above.

[0037] In step S34, door opening / closing recognizing unit 30 detects the distance to an object in detection area Ar by distance measuring sensor 31. In the next step S35, door opening / closing recognizing unit 30 recognizes the open / closed state of the door of refrigerator 110 based on the distance measurement data by distance measuring sensor 31. In the following step S36, notification control unit 22 determines whether door opening / closing recognizing unit 30 has recognized that the door of refrigerator 110 has switched from the open state to the closed state.

[0038] Then, when the notification control unit 22 recognizes that the door of the refrigerator 110 has switched from an open state to a closed state, the notification control unit 22 proceeds to step S37 and ends the user abnormality notification process according to the flowchart in Fig. 5. On the other hand, when the notification control unit 22 does not recognize that the door of the refrigerator 110 has switched from an open state to a closed state, the notification control unit 22 proceeds to step S41.

[0039] In step S41, the notification control unit 22 determines whether the watch timer has timed out. If the watch timer has timed out, the notification control unit 22 proceeds to step S42, whereby the related party terminal 92 and the management server 300 execute the process of notifying the user U of an abnormality and prompting the user U to confirm his / her safety, as described above. On the other hand, if the watch timer has not timed out, the notification control unit 22 proceeds to step S34.

[0040] [3. Effects, etc.] As described above, in this embodiment, the usage status notification device 1 includes the attachment unit 70, the controller 10, the distance measurement sensor 31, and the communicator 50, and the usage status notification device 1 is attached to the top surface of the refrigerator 110 by the attachment unit 70. The processor 20 constituting the controller 10 functions as the door opening / closing recognition processing unit 21 and the notification control unit 22, and the door opening / closing recognition processing unit 21 and the distance measurement sensor 31 constitute the door opening / closing recognition unit 30.

[0041] As a result, the door open / closed recognition unit 30 recognizes the open / closed state of the doors 111-116 of the refrigerator 110 based on distance measurement data within the detection area Ar near the front of the refrigerator 110 measured by the distance measurement sensor 31. Then, based on the recognition result of the open / closed state of the doors 111-116 of the refrigerator 110, the notification control unit 22 transmits door-forgotten-to-close information and monitoring information via the communicator 50 to a communication terminal such as the user terminal 91, the related party terminal 92, the smart speaker 160, or the management server 300. Therefore, even if the refrigerator 110 does not have a communication function, by attaching the usage status notifying device 1, it is possible to add a function of notifying a communication terminal of the usage status.

[0042] (Other embodiments) As described above, the above embodiment has been described as an example of the technology disclosed in this application. However, the technology in this disclosure is not limited to this, and can be applied to embodiments in which modifications, substitutions, additions, omissions, etc. are made. Therefore, other embodiments will be exemplified below.

[0043] In the above embodiment, the door open / closed state recognizing unit 30 recognizes the open / closed state of the doors 111-116 of the refrigerator 110 using the distance measuring sensor 31. However, other types of sensors may be used. For example, a camera may be provided to capture an image of the vicinity of the front of the refrigerator 110 and the image portions of the doors 111-116 included in the captured image may be extracted to recognize the open / closed state of the doors 111-116. Alternatively, a brightness sensor may be provided to detect the brightness of a detection area near the front of the refrigerator 110 to recognize the open / closed state of the doors 111-116.

[0044] In the above embodiment, the notification control unit 22 transmits the door-forgotten-to-close information and the user abnormality information to the communication terminal as the usage information of the refrigerator 110 based on the open / closed state of the door of the refrigerator 110 recognized by the door open / close recognizing unit 30. In another embodiment, only one of the door-forgotten-to-close information and the user abnormality information may be transmitted to the communication terminal. Furthermore, usage information other than the door-forgotten-to-close information and the user abnormality information may be transmitted to the communication terminal. For example, when it is recognized that the door of the refrigerator 110 has been opened or closed, usage information notifying that the refrigerator 110 has been used may be transmitted to the communication terminal.

[0045] The controller in the present disclosure may be any device capable of controlling the usage status notification device of the present disclosure. When expressing the subject matter of the invention, the device of the present disclosure may be controlled by a control means, a control unit, or similar terms in addition to the controller. The controller can be realized in various forms. For example, a processor may be used as the controller. If a processor is used as the controller, various processes can be executed by loading a program from a storage medium storing the program into the processor and executing the program by the processor. Therefore, the process contents can be changed by changing the program stored in the storage medium, so that the degree of freedom in changing the control contents can be increased. Examples of the processor include a CPU (Central Processing Unit) and an MPU (Micro-Processing Unit). Examples of the storage medium include a hard disk, a flash memory, and an optical disk. In addition, a wired logic in which the program cannot be rewritten may be used as the controller. Using a wired logic as the controller is effective in improving the processing speed. Examples of the wired logic include an ASIC (Application Specific Integrated Circuit). In addition, the controller may be realized by combining a processor and a wired logic. If the controller is realized by combining a processor and wired logic, it is possible to increase the degree of freedom of software design and improve the processing speed. In addition, the controller and a circuit having a function different from that of the controller may be configured with a single semiconductor element. An example of a circuit having a different function is an A / D-D / A conversion circuit. In addition, the controller may be configured with a single semiconductor element or multiple semiconductor elements. When configured with multiple semiconductor elements, each control described in the claims may be realized with different semiconductor elements. Furthermore, the controller may be configured with a configuration including a semiconductor element and a passive component such as a resistor or a capacitor.

[0046] The communicator in the present disclosure may be any one that enables communication between the usage status notification device of the present disclosure and an external device. When expressing the subject matter of the invention, in addition to the communicator, a communication means or a communication unit or a transmission / reception means or a transmission / reception unit or a similar term may be used to enable communication between the device of the present disclosure and an external device. The communicator can be realized in various forms. Examples of the communicator include a wireless connection with an external device via a base station or a direct wireless connection with an external device. Examples of the wireless connection with an external device via a base station or the like include a wireless LAN compatible with IEEE802.11 that wirelessly communicates with a WiFi (registered trademark) router, a third generation mobile communication system (commonly known as 3G), a fourth generation mobile communication system (commonly known as 4G), a WiMax (registered trademark) compatible with IEEE 802.16, or an LPWA (Low Power Wide Area). The use of a communicator that directly and wirelessly connects the device of the present disclosure to an external device is effective in improving the security of communication, and the device of the present disclosure can communicate with an external device even in a place where there is no relay device such as a WiFi (registered trademark) router. Examples of communicators that directly and wirelessly connect the device of the present disclosure to an external device include communication by Bluetooth (registered trademark), communication by NFC (Near Field Communication) via a loop antenna, and infrared communication.

[0047] It should be noted that the above-described embodiments are intended to illustrate the technology of the present disclosure, and various modifications, substitutions, additions, omissions, and the like can be made within the scope of the claims or their equivalents. [Industrial Applicability]

[0048] The present disclosure is applicable to applications in which a refrigerator that does not have a communication function is attached to add a function of transmitting usage information based on the open / close state of the refrigerator door to a communication terminal. [Explanation of symbols]

[0049] 1. Usage notification device 10 Controller 20 processors 21 Door opening / closing recognition processing unit 22 Notification control section 30 Door opening / closing recognition unit 31 Distance sensor 40 Memory 41 Control Program 50 Communicator 55 Setting switch 60 Power Ports 61 Power supply circuit 63 Battery 70 Mounting part 91 User terminal 92 Related party terminals 100 houses 110 Refrigerator 111 Refrigerator right door 112 Refrigerator left door 113 First freezer door 114 Ice Room Door 115 Second freezer door 116 Vegetable compartment door 150 Wi-Fi Router 160 Smart Speakers 200 Communication Network 300 Management Server 310 Usage DB 311 Notification destination DB

Claims

1. A door opening / closing recognition device that is attached to a top surface of an exterior part of a refrigerator, a mounting portion provided on a bottom surface of the door opening / closing recognition device and configured to fix the door opening / closing recognition device to the top surface; a sensor that detects an object present within a detection area on a front surface of the refrigerator from the top surface while the door opening / closing recognition device is attached to the top surface; a door opening / closing recognition unit that recognizes an opening / closing state of the refrigerator door based on a detection result of the sensor; a wireless communication unit for performing wireless communication; a notification control unit that transmits information based on a recognition result of an open / close state of the door recognized by the door open / close recognition unit through the wireless communication unit; A door opening / closing recognition device comprising:

2. the sensor is a distance sensor, The door opening / closing recognition unit recognizes an opening / closing state of the door of the refrigerator based on the distance measurement data output from the distance measurement sensor. The door opening / closing recognition device according to claim 1.

3. The door opening / closing recognizing unit recognizes, based on the distance measurement data output from the distance measurement sensor, that any door of the refrigerator is in an open state and that all doors of the refrigerator are in a closed state. The door opening / closing recognition device according to claim 2.

4. the sensor is a camera; The door opening / closing recognition unit recognizes whether the door of the refrigerator is opened or closed by extracting an image portion of the door included in the image captured by the camera. The door opening / closing recognition device according to claim 1.

5. the sensor is a brightness sensor, The door opening / closing recognition unit recognizes an opening / closing state of the door of the refrigerator based on the brightness data output from the brightness sensor. The door opening / closing recognition device according to claim 1.

6. The attachment portion is a magnet. The door opening / closing recognition device according to any one of claims 1 to 5.

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