JP2009211240A - Abnormal condition detection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely detect an opening/closing state of a door of a toilet, and to detect an abnormal condition by accurately measuring a stay time in the toilet, in an abnormal condition detection device for detecting an abnormal condition of a person in the toilet. <P>SOLUTION: An abnormal condition detection device 1 for detecting an abnormal condition of a user 5 in a toilet 2 is provided with: ultrasonic sensors 12 and 13 for transmitting an ultrasonic wave from an upper part to a lower part of the toilet 2, and for receiving the reflected wave of the ultrasonic wave; a storage part 16 for storing height H1 of a door 3 of the toilet 2; an opening/closing detection part 21 for detecting the opening/closing state of the door 3 based on reception signals corresponding to the reflected waves of the ultrasonic sensors 12 and 13 and the height H1 of the door 3 in the storage part 16; and an abnormal condition decision part 23 for measuring a stay time T1 of the user 5 in the toilet 2 based on the opening/closing state of the door 3 detected by the opening/closing detection part 21, and for deciding that the user is in an abnormal condition when the stay time T1 exceeds a first permission time TS1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an abnormality detection device that detects a physical abnormality of a person in a monitored room, and more particularly to a detection device that detects a physical abnormality that occurs in a closed room such as a toilet.

  In recent years, with the advancement of medical technology, the proportion of elderly people has increased, and the opportunity to complain of physical abnormalities while at home has increased. If an abnormality occurs in a place where families can easily gather, such as a living room, it can be dealt with relatively quickly, but if an abnormality occurs in a closed room such as a toilet, discovery may be delayed. There is not much, and there is no denying the danger of getting important.

  Therefore, for example, Patent Document 1 discloses an abnormality monitoring device that provides a lock sensor on a toilet door and detects an abnormality by measuring the occupancy time of a person in the toilet. In this abnormality monitoring device, based on the signal of the lock sensor, the time from locking to unlocking is measured, and if the measurement time exceeds the allowable time, it is determined that an abnormality has occurred and an abnormality alarm etc. Is output.

  According to the above abnormality monitoring device, when an abnormality occurs in the toilet, it is immediately notified to the family and the person in charge of care. It becomes possible to detect quickly.

JP 2006-330952 A

  However, in the abnormality monitoring device described in Patent Document 1, it is not determined that a person has entered the toilet unless the toilet door is locked. Therefore, if the door is not locked, There is a problem that the measurement is not performed and the abnormality monitoring itself is not performed.

  In addition to the above methods, a system has been devised to detect the opening and closing of the door by providing an electromagnetic or optical contact sensor etc. on the door part, but even if such a system is used for monitoring abnormalities in the toilet Unless the door is closed to the predetermined closing position, it is not possible to detect the closing of the door. For this reason, there is a risk that the occupancy time cannot be accurately measured, and there is a possibility that an abnormal situation may still be overlooked.

  Therefore, the present invention has been made in view of the above-described problems in the prior art, and can reliably detect opening and closing of the door of the monitored room, and accurately measure the occupancy time in the monitored room. An object of the present invention is to provide an abnormality detection device capable of performing abnormality detection.

  In order to achieve the above object, the present invention provides an abnormality detection device for detecting an abnormality of a person in a monitored room, which emits ultrasonic waves from above to below the monitored room, Based on the ultrasonic sensor that receives the reflected wave, the storage unit that stores the height of the door of the monitoring target room, the received signal according to the reflected wave of the ultrasonic sensor, and the height of the door in the storage unit When a change detection unit that detects a change in the state of a door and a person's occupancy time in the monitored room are measured using the detection result of the change detection unit, and the occupancy time exceeds a predetermined allowable time And an abnormality determining unit that determines that the abnormality is present.

  And according to this invention, in order to detect the state change of a door based on the information regarding the height of the door memorize | stored in the memory | storage part, and the received signal of the ultrasonic sensor at the time of actual use, a door is an ultrasonic sensor. By simply passing through the sensing area, it is possible to detect door opening and closing operations. For this reason, it is possible to detect that the person has moved the door without completely closing the door, and it is possible to detect the entrance / exit of the person with high accuracy. Thereby, it becomes possible to accurately measure the occupancy time of a person in the monitored room, and it is possible to reliably detect an abnormality.

  In the abnormality detection apparatus, a plurality of the ultrasonic sensors may be provided, and the plurality of ultrasonic sensors may be arranged along the opening / closing direction of the door. According to this configuration, it is possible to detect the opening / closing of the door only by moving the door in the opening direction or the closing direction, so that it is possible to detect the entrance / exit of a person with higher accuracy.

  The abnormality detection apparatus includes a height detection unit that detects a height of a person in the monitoring target room based on a reception signal of the ultrasonic sensor, and the storage unit stores the height of the person detected by the height detection unit. The abnormality determination unit identifies the posture of the person in the monitoring target room based on the reception signal of the ultrasonic sensor and the height of the person in the storage unit, and the posture of the identified person is a predetermined normal When it is different from the posture, it can be determined as abnormal.

  According to the above configuration, if a person takes an abnormal posture such as falling down in the monitored room, it is immediately detected that an abnormality has occurred. Therefore, even if the person's occupancy time has not reached the abnormal time, monitoring is performed. It can be detected that an abnormality has occurred in the target room. For this reason, it becomes possible to quickly detect the physical abnormality of the user that has occurred in the monitored room, and it is possible to deal with it quickly.

  In the abnormality detection apparatus, the abnormality determination unit sets an area having a predetermined height from the floor surface of the monitoring target room as an abnormal area, and determines that an abnormality occurs when a person's top is located in the abnormal area. can do.

  According to the above configuration, it is not necessary to install a large number of ultrasonic sensors in the room to be monitored in order to determine the abnormality based on the position of the top of the person rather than identifying the entire posture of the person, and with a simple configuration. Anomaly detection can be performed.

  The abnormality detection device includes an output adjustment unit that adjusts an output of the ultrasonic sensor so that the top of the person cannot be detected in the abnormality region, and the abnormality determination unit is the monitoring target after the person enters the room When the position of the person's top cannot be identified from the reception signal of the ultrasonic sensor in the room, it can be determined that the person's top belongs to the abnormal region.

  According to the above configuration, it is possible to detect an abnormality only by limiting the output of the ultrasonic sensor so that the top of the person cannot be sensed within the abnormal region. It becomes possible to do. Further, in this case, since an ultrasonic sensor that is generally commercially available is used with a lower output, it is possible to reduce power consumption.

  In the abnormality detection apparatus, the output adjustment unit can automatically adjust the output of the ultrasonic sensor based on the height of the monitoring target room and the height of the abnormal region.

  According to this configuration, since the output of the ultrasonic sensor is automatically adjusted according to the height of the monitoring target room in which the abnormality detection device is installed, the size of the monitoring target room in which the abnormality detection device can be used is limited. Can be avoided, and versatility can be improved. In addition, when the abnormality detection device is installed, it is not necessary for the user himself / herself to fine-tune the output of the ultrasonic sensor, so that convenience can be improved.

  As described above, according to the present invention, it is possible to reliably detect the opening / closing of the door of the monitoring target room, and it is possible to detect an abnormality by accurately measuring the occupancy time in the monitoring target room.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows an embodiment of a system in which an abnormality detection apparatus according to the present invention is applied to a toilet. The abnormality detection apparatus 1 is installed and used on an upper part of a toilet 2 such as a ceiling portion 2a.

  The abnormality detection apparatus 1 has, for example, the appearance shown in FIG. 2 and is configured by attaching two sets of ultrasonic sensors 12 and 13 and an LED 14 as a light emitting means to the apparatus main body 11. Among these, the ultrasonic sensors 12 and 13 are each configured by a pair of transmitting sensors 12a and 13a for transmitting ultrasonic waves and receiving sensors 12b and 13b for receiving reflected waves. .

  When installing the abnormality detection device 1, the installation position and direction of the abnormality detection device 1 are adjusted, and as shown in FIG. 3, an area where the ultrasonic sensor 12 can receive reflected waves (hereinafter referred to as “sensing area”). 12c and the sensing area 13c of the ultrasonic sensor 13 are arranged on the movement locus of the tip 3a of the door 3. At that time, the sensing area 13c is installed so as to be located inside the sensing area 12c, the ultrasonic sensor 13 is operated around the door opening position of the door 3, and the ultrasonic sensor 12 is arranged around the closing position. Operate.

  Further, the abnormality detection device 1 has the functional configuration shown in FIG. 4 and stores the ultrasonic sensors 12 and 13 described above, the distance calculation unit 15 that calculates the distance from the ceiling 2a to the object, and various data. The storage unit 16, the abnormality detection unit 17 that detects the abnormality of the user 5, the output unit 18 that outputs the abnormality detected by the abnormality detection unit 17 to the external device, and light emission according to the setting operation, abnormality detection, and the like. The LED 14 includes an output adjustment unit 19 that adjusts the outputs of the ultrasonic sensors 12 and 13, and a control unit 20 that comprehensively controls the operation of the abnormality detection apparatus 1 as a whole.

  The distance calculation unit 15 derives the time from the transmission of the ultrasonic wave to the reception of the reflected wave based on the reception signals output from the ultrasonic sensors 12 and 13, and calculates the distance from the ceiling part 2a to the object that reflects the ultrasonic wave. Is to be calculated. The distance calculation unit 15 is provided to detect the height of the door 3, the height of the user 5 in the toilet 2, the height at which the top of the user 5 is located (see FIG. 1), and the like.

  The storage unit 16 is an internal memory that stores measurement values measured using the ultrasonic sensors 12 and 13, various set times, and the like. The storage unit 16 stores data related to the height of the door 3 and the height, data related to an allowable time used for abnormality determination, and the like.

  The abnormality detection unit 17 detects presence / absence of abnormality using reception signals of the ultrasonic sensors 12 and 13, data in the storage unit 16, and the like, and includes an open / close detection unit 21, a timer 22, and an abnormality determination unit 23. Is done. The open / close detection unit 21 is for detecting opening / closing of the door 3, and the timer 22 is for measuring the occupancy time of the user 5 and the like. The abnormality determination unit 23 is for determining whether or not a physical abnormality has occurred in the user 5 based on the reception signals of the ultrasonic sensors 12 and 13, the count value of the timer 22, and the like.

  The output unit 18 is a communication device for transmitting an abnormality detection signal output from the abnormality detection unit 17 to an external display device, a care center (not shown), or the like. As the output unit 18, a power line communication device described in JP-A-2004-336708 can be used in addition to a communication device used in a wired LAN, a wireless LAN, or the like.

  The output adjustment unit 19 is for adjusting the intensity of the ultrasonic wave transmitted from the ultrasonic sensors 12 and 13 and the reception sensitivity of the reflected wave at the sensors 12 and 13. The output of the ultrasonic sensors 12 and 13 can be adjusted by connecting a variable resistor or the like to both the sensors 12 and 13 and adjusting the resistance value thereof.

  Next, an abnormality detection method using the abnormality detection apparatus 1 having the above configuration will be described with reference to FIGS. Here, in order to facilitate the understanding of the operation of the abnormality detection device 1, the whole will be schematically described prior to the description of each operation.

  In the abnormality detection process using the abnormality detection device 1, roughly classified, the abnormality determination of the occupancy time of the user 5 based on the detection of opening / closing of the door 3 and the abnormality determination process based on the position of the top of the user 5 after entering the room. Two types of detection processing are performed.

  In the former “determination of abnormality in the occupancy time of the user 5 based on detection of opening / closing of the door 3”, as shown in FIG. 5, first, the sensing area of the abnormality detection device 1 (sensing by the ultrasonic sensors 12 and 13). When an object having a height matching the height H1 of the door 3 passes within the area), it is detected that the door 3 has been opened and closed. At that time, the moving direction of the passed object is determined from the detection order of the ultrasonic sensors 12 and 13, and it is also detected whether the door 3 is opened or whether the door 3 is closed.

  Then, the time (corresponding to the occupancy time) between the detection of the first opening / closing (corresponding to the user 5 entering the room) and the second opening / closing (corresponding to the leaving) is measured, and the measurement time is allowed. When the time is exceeded, it is determined that an abnormal situation has occurred.

  On the other hand, in the latter “abnormality determination based on the position of the top of the user 5 after entering the room”, as shown in FIG. 6, first, the height H3 of the abnormal region A3 is set, and the ultrasonic sensors 12, 13 are set. The height H2 of the user 5 is measured based on the received signal. Among these, the height H3 of the abnormal area A3 is such that the top of the user 5 is in a state where the user 5 has fallen on the floor surface 2b or is extremely bent forward while sitting on the toilet bowl 4. This corresponds to the height of the existing area.

  Here, “the top of the user 5” does not necessarily mean the head of the user 5, but means the top of the user 5. Therefore, for example, when the user 5 takes a forward bending posture and the back is positioned above the head, the back corresponds to the “top of the user 5”.

  The height H4 in the figure corresponds to the height when the user 5 is sitting on the toilet 4 in a normal posture. For this reason, the existence area | region of the top part of the user 5 is area | region A2 (area | region remove | excluding the area | region of height H4 from the area | region of height H2), and area | region A4 (area | region which remove | excluded abnormal area | region A3 from the area | region of height H4). It is possible to recognize whether the user 5 in the room is standing or sitting.

  During the staying period of the user 5, it is detected from the reception signals of the ultrasonic sensors 12 and 13 that the top of the user 5 is present in the abnormal area A <b> 3, and this is maintained for a predetermined time. In this case, it is determined that an abnormal situation has occurred.

  Next, each operation in the abnormality detection process will be described. Here, first, the initial setting process will be described with reference to FIGS. 2, 7, and 8.

  The initial setting process is performed when the abnormality detection apparatus 1 is installed or after the toilet 2 is refurbished. In this process, as shown in FIGS. 7 and 8, first, ultrasonic waves are transmitted from the ultrasonic sensors 12 and 13 toward the floor surface 2b, and the distance calculation unit 15 causes the ceiling portion 2a to the floor surface 2b. The distance is calculated and the height H5 of the toilet 2 is measured (step S1).

  Next, the output adjuster 19 adjusts the outputs of the ultrasonic sensors 12 and 13 in accordance with the relationship between the height H5 of the toilet 2 and the height H3 of the abnormal area A3 (step S2). Specifically, the intensity of the ultrasonic waves transmitted from the ultrasonic sensors 12 and 13 is increased or decreased, and the distance D from the ceiling 2a (the height H5 of the toilet 2 minus the height H3 of the abnormal area A3). It is set so that the presence of a human body and clothes can be sensed only within AD. For example, when the initial output of the ultrasonic sensors 12 and 13 is high and the presence of a human body or clothes is detected in the entire area of the toilet 2, the ultrasonic sensor is not detected until the presence of the human body or clothes cannot be detected in the abnormal area A3. 12 and 13 outputs are reduced.

  In addition, since the reflectance of ultrasonic waves differs between a human body or clothes and another object (floor surface 2b of the toilet 2, etc.), the above adjustment processing is performed using the difference in reflectance. For this reason, after the adjustment of the outputs of the ultrasonic sensors 12 and 13, even if the top of the user 5 exists in the abnormal area A3, it cannot be directly detected from the received signals of the ultrasonic sensors 12 and 13. Become.

  Next, the distance calculation unit 15 measures the height H1 of the door 3 from the reception signals of the ultrasonic sensors 12 and 13, and stores it in the storage unit 16 (step S3). The measurement of the height H1 of the door 3 needs to be performed in a state where the door 3 is present in the sensing area of the ultrasonic sensors 12 and 13, and thus is performed while opening and closing the door 3.

  Next, a threshold value (first allowable time) TS1 for detecting an abnormality in the occupancy time T1 of the user 5 is set (step S5). The first allowable time TS1 is for determining whether or not the user 5 has not left the toilet 2 for a long time, and is preferably set to about 20 to 30 minutes, for example.

  The first allowable time TS1 is not limited to being set at the time of initial setting, but can also be set as a default value at the manufacturing stage of the abnormality detection device 1. Also, the first allowable time TS1 is not set to a fixed value, but can be changed by the user 5 during use.

  Next, a threshold value (second allowable time) TS2 for detecting an abnormality in the position of the top of the user 5 is set (step S6). This second permissible time TS2 determines the permissible time when the top of the user 5 is present in the abnormal area A3. Even if no physical abnormality has occurred, an object that has fallen on the floor 2b. If an operation such as picking up is performed, the top of the user 5 exists in the abnormal area A3. On the other hand, when the top of the user 5 is present in the abnormal area A3 due to the occurrence of a physical abnormality, it is necessary to identify the abnormality as soon as possible.

  For this reason, it is preferable to set the second allowable time TS2 to, for example, a time of about 30 seconds to 3 minutes, thereby quickly detecting an abnormality while avoiding erroneous detection based on a temporary operation. Is possible. Note that the second allowable time TS2 may be set at the manufacturing stage as in the case of the first allowable time TS1, or may be changed later.

  Next, the abnormality detection process will be described with reference to FIGS. 2 and 9.

  When the user 5 opens the door 3 and enters the toilet 2 (see FIG. 1), first, as shown in FIG. 9, the opening / closing detection unit 21 detects the opening of the door 3 (step S11). Next, the distance calculation unit 15 calculates the height H2 of the user 5 from the reception signals of the ultrasonic sensors 12 and 13, and stores it in the storage unit 16 (step S12).

  Thereafter, when the user 5 closes the door 3, the opening / closing detector 21 detects the closing of the door 3 (step S13). At this time, even if the door 3 is not completely closed, the received signal of the ultrasonic sensors 12 and 13 is changed only by moving the door 3 in the closing direction, so that the closing operation of the user 5 is accurately detected. can do.

  When the closing of the door 3 is detected, the timer 22 is activated and measurement of the occupancy time T1 is started (step S14). When the user 5 starts using the toilet 2, the “abnormality determination based on the position of the top of the user 5 after entering the room” is started (step S15). For convenience of explanation, this will be described in detail later. . In the description of steps S16 to S20 below, it is assumed that no abnormality is detected in the process of step S15.

  Next, the abnormality determination unit 23 compares the time measured by the timer 22 with the first allowable time TS1, and determines whether or not the occupancy time T1 exceeds the first allowable time TS1 (step S16). Thereafter, if the opening of the door 3 cannot be detected even after the first allowable time TS1 is exceeded, it is determined that some abnormality has occurred in the user 5 in the toilet 2 (step S17), and the output unit 18 is connected. An abnormality detection signal is output (step S18).

  On the other hand, when opening of the door 3 is detected at the time when the occupancy time T1 does not exceed the first allowable time TS1 (step S16: No, step S19), it is determined to be in a normal state (step S16). S20) The count value of the timer 22 is reset without outputting the abnormality detection signal (step S21).

  As described above, according to the present embodiment, the data of the height H1 of the door 3 measured using the ultrasonic sensors 12 and 13 is stored in the storage unit 16 in advance, and the data of the height H1 and the actual data are stored. Since the opening and closing of the door 3 is detected based on the reception signals of the ultrasonic sensors 12 and 13 in use, the opening and closing of the door 3 is detected only by the door 3 passing through the detection area of the ultrasonic sensors 12 and 13. can do. For this reason, it is possible to detect that the user 5 has moved the door 3 without completely closing the door 3, and it is possible to detect the entrance / exit of the user 5 with high accuracy. Thereby, it becomes possible to accurately measure the occupancy time of the person in the toilet 2 and to perform reliable abnormality detection.

  In the above-described embodiment, when determining whether the user 5 has entered the room, both the opening and closing of the door 3 are detected. For example, a state where the door is opened when not in use, such as a public toilet. If the object is to be maintained, only the closing of the door 3 may be detected and associated with the user 5 entering the room.

  Next, the abnormality determination (step S15 in FIG. 9) based on the position of the top of the user 5 after entering the room will be described with reference to FIGS. 2, 6, and 10.

  In such an abnormality determination, as shown in FIG. 10, first, the distance calculation unit 15 detects the position of the top of the user 5 based on the reception signals of the ultrasonic sensors 12 and 13 (step S31). In addition, when detecting the position of the top portion, either one of the reception signals of the ultrasonic sensors 12 and 13 may be used, or both reception signals may be used.

  Next, the abnormality determining unit 23 determines whether or not the position of the top can be identified (step S32). If the position can be identified, whether or not the identified position belongs to the area A2 shown in FIG. Is determined (step S33).

  As a result of the determination, when belonging to the area A2, the user 5 is identified as standing (see 5a in FIG. 6) (step S34). On the other hand, when the user 5 does not belong to the area A2, the position of the user 5 belongs to the area A4 shown in FIG. 6, so the user 5 is sitting on the toilet 4 in a normal posture (FIG. 6). 5b) (step S35). In these cases, since it is not recognized that the posture of the user 5 is abnormal, it is determined that the user 5 is in a normal state (step S36), and the detection of the position of the top is continued until the opening of the door 3 is detected. (Step S37: No).

  On the other hand, when the position of the top cannot be identified (including the case where the presence of the top cannot be recognized) (step S32: No), the position of the top belongs to the abnormal region A3 shown in FIG. Therefore, it is determined that an abnormal situation may have occurred (step S38). At the same time, the timer 22 is activated to start the measurement of the existence time T2 in the abnormal area A3 (step S39).

  Next, the abnormality determination unit 23 compares the time measured by the timer 22 with the second allowable time TS2, and determines whether the existence time T2 exceeds the second allowable time TS2 (step S40).

  After that, when the existence time T2 exceeds the second allowable time TS2 while the state where the position of the top cannot be identified is maintained (step S40: Yes), the user 5 has fallen down in the toilet 2 (see FIG. 6c), it is determined that an abnormality has occurred (step S41), and an abnormality detection signal is output via the output unit 18 (step S42). .

  On the other hand, if it is possible to identify that the position of the apex belongs to the region A2 or A4 before the existence time T2 exceeds the second allowable time TS2 (step S40: No, step S43), an abnormality has occurred. It determines with having not carried out (step S44), and resets the count value of the timer 22 (step S45). Thereafter, similarly to step S26, the position of the top is continuously detected until the opening of the door 3 is detected (step S37: No).

  As described above, according to the present embodiment, the position of the top of the user 5 is identified from the received signals of the ultrasonic sensors 12 and 13, and it is determined whether or not the identified position belongs to the abnormal area A3. If the user 5 takes an abnormal posture such as falling down in the toilet 2 in order to determine the abnormality, the user 5 is informed even before the occupancy time T1 reaches the abnormal time (first allowable time TS1). It can be detected that some abnormality has occurred. Thereby, it becomes possible to quickly detect the physical abnormality of the user 5 that has occurred in the monitored room, and to deal with it quickly.

  In addition, in the above case, since it is not necessary to identify the entire posture of the user 5 but to determine an abnormality based on the height at which the top is located, it is not necessary to install a large number of ultrasonic sensors in the toilet 2. It is also possible to detect an abnormality with a simple configuration.

1 is an overall configuration diagram showing an embodiment of an abnormality detection device according to the present invention. It is an external view which shows the abnormality detection apparatus of FIG. It is a schematic diagram which shows the example of installation of the abnormality detection apparatus of FIG. It is a block diagram which shows the functional structure of the abnormality detection apparatus of FIG. It is a figure explaining the outline of an abnormality detection method. It is a figure explaining the outline of an abnormality detection method. It is a flowchart explaining the operation | movement of an initial setting process. It is a schematic diagram explaining the operation | movement of an initial setting process. It is a flowchart explaining operation | movement of an abnormality detection process. It is a flowchart explaining operation | movement of step S15 of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Abnormality detection apparatus 2 Toilet 2a Ceiling part 2b Floor 3 Door 3a Tip part 4 Toilet bowl 5 (5a-5c) User 11 Apparatus main body 12, 13 Ultrasonic sensor 12a, 13a Transmission sensor 12b, 13b Reception sensor 12c, 13c Sensing area 14 LED
DESCRIPTION OF SYMBOLS 15 Distance calculation part 16 Memory | storage part 17 Abnormality detection part 18 Output part 19 Output adjustment part 20 Control part 21 Opening / closing detection part 22 Timer 23 Abnormality determination part

Claims (6)

An anomaly detection device that detects an anomaly of a person in a monitored room,
An ultrasonic sensor for transmitting an ultrasonic wave from the upper side to the lower side of the monitored room and receiving a reflected wave of the ultrasonic wave;
A storage unit for storing the height of the door of the monitored room;
A change detection unit that detects a change in the state of the door based on a received signal corresponding to a reflected wave of the ultrasonic sensor and a height of the door in the storage unit;
An abnormality determination unit that measures a person's occupancy time in the monitored room using the detection result of the change detection unit and determines that an abnormality occurs when the occupancy time exceeds a predetermined allowable time; An abnormality detection device characterized by.   The abnormality detection apparatus according to claim 1, wherein a plurality of the ultrasonic sensors are provided, and the plurality of ultrasonic sensors are arranged along an opening / closing direction of the door. A height detector that detects the height of a person in the monitored room based on the reception signal of the ultrasonic sensor,
The storage unit stores the height of the person detected by the height detection unit,
The abnormality determination unit identifies the posture of the person in the monitoring target room based on the reception signal of the ultrasonic sensor and the height of the person in the storage unit, and the posture of the identified person is a predetermined normal posture. The abnormality detection device according to claim 1, wherein the abnormality detection device determines that an abnormality occurs when the two are different.   The abnormality determining unit sets an area having a predetermined height from the floor surface of the monitoring target room as an abnormal area, and determines that an abnormality occurs when a person's top is located in the abnormal area. The abnormality detection device according to claim 3. An output adjustment unit that adjusts the output of the ultrasonic sensor so that the top of a person cannot be sensed within the abnormal region;
The abnormality determination unit determines that the top of the person belongs to the abnormal region when the position of the top of the person cannot be identified from the reception signal of the ultrasonic sensor in the monitored room after the person enters the room. The abnormality detection device according to claim 4, wherein:   The abnormality detection apparatus according to claim 5, wherein the output adjustment unit automatically adjusts the output of the ultrasonic sensor based on a height of the monitoring target room and a height of the abnormal region.

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