Notification device and abandoned vehicle notification system

Abstract

This invention provides a notification device and an abandoned vehicle notification system that can suppress the generation of unnecessary alarms by providing different notifications depending on the reception status of a signal indicating whether or not there is a person in the seat inside the vehicle. [Solution] The system includes a communication unit 230 that receives a signal indicating whether or not there is a person in a seat inside the car, and a notification unit 220 that provides notification based on the content received by the communication unit 230. The notification unit 220 provides a warning notification if a predetermined period of time has elapsed since the last time an ON signal indicating that there is a person in the child seat was received and no ON signal has been received since then, and provides a preliminary notification if an ON signal is received before a predetermined period of time has elapsed since the last time an ON signal was received, and the reception state satisfies predetermined conditions.

Description

[[Technical Field]]

[0001] The present invention relates to a notification device and a leaving-behind notification system. [[Background Art]]

[0002] When a parent leaves a child in an automobile and exits the vehicle, accidents may occur in which the temperature inside the vehicle rises and the child suffers health damage such as heat stroke, which has been a problem.

[0003] Patent Document 1 discloses a child seat check system comprising at least one child seat, a first check device for checking whether a child is present in the child seat, and a second check device for checking whether a person caring for the child is present, wherein the second check device is at least partially portable in the operating state of the child seat check system, and / or operates independently of the on / off state of the vehicle.

[0004] Patent Document 2 discloses a monitoring and notification system comprising a monitoring device, a monitored device monitored by the monitoring device, and a plurality of notification receiving devices that receive warning notifications from the monitoring device, wherein the monitoring device includes: a distance recognition unit that recognizes a first distance from the monitoring device to the monitored device and respective second distances from the monitoring device to each of the notification receiving devices; an order setting unit that sets a notification order for the warning notification; and a notification unit that transmits the warning notification to the notification receiving device having the first rank in the notification order when the first distance is equal to or less than a first predetermined value and all of the plurality of second distances exceed the first predetermined value. [[Related Art Documents]] [[Patent Documents]]

[0005] [[Patent Document 1]] Japanese National Publication of International Patent Application No. 2021-501717 [[Patent Document 2]] Japanese Unexamined Patent Publication No. 2023-148600 [Overview of the project] [Problems that the invention aims to solve]

[0006] There is a system that includes a detection device that detects when a person (child) is inside a car, and an alert device that issues a warning if the detection device detects a person and the parent leaves the vehicle. This system is designed to alert parents if they leave the car with a child inside. In such a system, the detection device and the alert device are usually connected by wireless communication. However, wireless communication is susceptible to changes in communication conditions due to the influence of the communication environment. As a result, it is possible that a warning may be issued incorrectly when there is no need to issue one, or that a warning may not be issued when there is a need to issue one.

[0007] The present invention aims to provide a notification device and an abandoned vehicle notification system that can suppress the generation of unnecessary alarms by providing different notifications depending on the reception status of a signal indicating whether or not there is a person in a seat inside a vehicle. [Means for solving the problem]

[0008] The present invention, which achieves the above objective, A receiving means for receiving a signal indicating whether or not there is a person in a seat inside a car, The system includes a notification means that provides notification based on the content received by the receiving means, The aforementioned notification means is, If a predetermined period of time has elapsed since the last time a signal indicating that a person is in a seat inside the vehicle was received, and no such signal has been received, the first notification will be made. If, after the last time a signal indicating that a person is in a seat inside the vehicle is received, the signal is received again before the predetermined time has elapsed, and the reception condition satisfies the predetermined conditions, the second notification is to be made. This is a notification device characterized by the following: Here, the notification means is The second notification is performed when the radio waves received from the aforementioned signal are weaker than the threshold. The structure is also good. Furthermore, the notification means is The second notification is given if the radio waves remain weaker than the threshold for a predetermined period of time or longer. The structure is also good. Furthermore, the notification means is If the reception of the aforementioned signal is interrupted more than a predetermined number of times within a predetermined period, the second notification will be issued. The structure is also good. Furthermore, the notification means is The second notification is given if the signal strength of the signal received again after the interruption is weaker than the signal strength of the signal before the interruption. The structure is also good. Other aspects of the present invention that achieve the above objectives include: A transmitter that emits a signal indicating whether or not there is a person in the seat inside the car, The notification means described in claims 1 to 5, This is an abandoned vehicle notification system characterized by having the following features. Here, the transmitting device is A first signal indicating that a person is in the seat inside the vehicle is transmitted at a predetermined first time interval. A second signal indicating that there is no person in the seat inside the vehicle is transmitted at a second time interval different from the first time interval. The structure is also good. Furthermore, the second time interval for transmitting the second signal is longer than the first time interval for transmitting the first signal. The structure is also good. [Effects of the Invention]

[0009] According to the present invention, it is possible to realize a notification device and an abandoned vehicle notification system that can suppress the generation of unnecessary alarms by providing different notifications depending on the reception status of a signal indicating whether or not there is a person in the seat inside the vehicle. [Brief explanation of the drawing]

[0010] [Figure 1] FIG. 1 is a diagram showing the overall configuration of a leaving-behind notification system according to the present embodiment. [Figure 2] FIG. 2 is a diagram showing the configuration of a transmitting device. [Figure 3] FIG. 3 is a diagram showing the configuration of a notification device. [Figure 4] FIG. 4 is a diagram showing the content of evaluation based on a signal transmitted from a transmitting device. [Figure 5] FIG. 5 is a diagram showing an operation example of a notification device when performing preliminary notification in addition to warning notification. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. <Overall Configuration> FIG. 1 is a diagram showing the overall configuration of a leaving-behind notification system according to the present embodiment. A leaving-behind notification system 10 includes a transmitting device 100 that transmits a signal indicating whether or not a person is present on a seat in an automobile, and a notification device 200 that receives the signal transmitted from the transmitting device 100 and notifies a user of the signal. The transmitting device 100 is provided on a child seat CS attached to a seat S of an automobile C. The transmitting device 100 detects whether or not a person (child) is present on the child seat, and wirelessly transmits a signal indicating the detection result. The notification device 200 receives the signal transmitted from the transmitting device 100, and performs notification according to a reception situation.

[0012] <Configuration of Transmitting Device 100> FIG. 2 is a diagram showing the configuration of a transmitting device 100. The transmitting device 100 includes a control unit 110, a detection unit 120, a communication unit 130, and a power supply unit 140. As described above, the transmitting device 100 is provided on the child seat CS. The transmitting device 100 transmits a signal that enables identification of whether a person is present on the child seat CS. Specifically, the transmitting device 100 transmits different signals depending on whether a person is present on the child seat CS or not. The signal transmitted from the transmitting device 100 is received by the notification device 200.

[0013] The control unit 110 comprises a processor 111 and a storage device 112. The processor 111 controls the operation of each part of the transmitter 100 by reading and executing a program. For example, the processor 111 may be a CPU (Central Processing Unit), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), etc.

[0014] The storage device 112 stores programs executed by the processor 111 and configuration information used for data processing by the processor 111. The storage device 112 is also used as working memory when the processor 111 executes processing. For example, the storage device 112 may be a non-volatile memory that allows data reading and writing. The storage device 112 may also be provided as separate ROM (Read Only Memory) for storing programs and other data, and RAM (Random Access Memory) that allows data reading and writing.

[0015] The detection unit 120 detects whether a person is in the child seat CS. Various sensors that can be used to detect the presence of a person can be used as the detection unit 120. For example, the detection unit 120 may be a weight sensor that detects the weight of a person sitting in the child seat CS. Various existing types of sensors can be used as the weight sensor, such as a strain gauge type, a pressure sensor type, or a type that recognizes changes in capacitance. In addition, the detection unit 120 may be a temperature sensor that detects the body temperature of a person sitting in the child seat CS, or a radio wave sensor that detects the movement of a person sitting in the child seat CS.

[0016] The communication unit 130 transmits a signal via wireless communication to identify whether or not a person is in the child seat CS. As will be described in more detail later, the communication by the communication unit 130 of the transmitting device 100 takes place over a short distance of about 10m. For example, Bluetooth® may be used to transmit the signal by the communication unit 130.

[0017] The power supply unit 140 supplies power to each part of the transmitter 100. By providing the power supply unit 140 to the transmitter 100, the transmitter 100 does not need to receive power from an external source. Various existing batteries can be used as the power supply unit 140.

[0018] The control unit 110 transmits a signal to the communication unit 130 to identify whether or not there is a person in the child seat CS, according to the detection result of the detection unit 120. The control unit 110 transmits different signals depending on whether or not there is a person in the child seat CS. Here, in order to identify whether or not there is a person in the child seat CS, it is also possible to control the system so that a signal is transmitted only when there is a person in the child seat CS. However, in this case, when a signal is not transmitted, it is not possible to determine whether the signal is not transmitted because there is no person in the child seat CS, or because the transmission device 100 has failed or the power supply unit 140 has run out of power. In addition, in the case of the notification device 200, there may be cases where the signal is not received due to a failure of the transmission device 100 or the notification device 200, or when the signal cannot be received due to poor radio wave conditions. To avoid such situations, the control unit 110 transmits a first signal indicating that there is a person in the child seat CS and a second signal indicating that there is no person to the communication unit 130, respectively. In the following, the first signal indicating that a person is in the child seat CS may be referred to as the ON signal, and the second signal indicating that no one is in the child seat CS may be referred to as the OFF signal.

[0019] As an example of how signals are transmitted, a signal to identify whether or not a person is in the child seat CS may be transmitted repeatedly at regular intervals. In this case, the interval between signal transmissions may differ depending on whether or not a person is in the child seat CS. Specifically, when a person is in the child seat CS, an ON signal may be transmitted at short intervals, and when a person is not in the child seat CS, an OFF signal may be transmitted at longer intervals than the ON signal transmission interval. The time interval at which the ON signal is transmitted is an example of a first time interval. The time interval at which the OFF signal is transmitted is an example of a second time interval. When no one is in the child seat CS, there is no problem with transmitting signals at a low frequency because there is no emergency situation such as abandonment.

[0020] <Configuration of the notification device 200> Figure 3 shows the configuration of the notification device 200. The notification device 200 comprises a control unit 210, a notification unit 220, and a communication unit 230. The notification device 200 is an information processing terminal that is portable by the user (parent) and can communicate with the transmitting device 100. In practice, the notification device 200 is intended to be carried and used by the user. Depending on the reception status of the signal transmitted from the transmitting device 100, the notification device 200 makes a notification indicating that there is a possibility that a person is left in the child seat CS. An example of a device that can be used as the notification device 200 is, for example, a smartphone.

[0021] The control unit 210 comprises a processor 211, a main memory 212, and a sub-memory 213. The processor 211 controls the operation of each part of the notification device 200 and performs data processing by reading and executing a program. For example, the processor 211 may be a CPU, a GPU (Graphics Processing Unit), an NPU (Neural Network Processing Unit), etc.

[0022] The main memory 212 is memory used as working memory when the processor 211 executes processing. For example, RAM is used as the main memory 212. The secondary memory 213, also called auxiliary memory, stores programs executed by the processor 211 and configuration information used for data processing by the processor 211. For example, non-volatile memory such as ROM or flash memory is used as the secondary memory 213. When a smartphone is used as the notification device 200, application software to realize the functions of the notification device 200 is installed on the smartphone and stored in the secondary memory 213.

[0023] The notification unit 220 comprises a display device 221 and an audio output device 222. The display device 221 displays various information screens, operation screens, etc. For example, a liquid crystal display or an organic EL (Electro-Luminescence) display can be used as the display device 221. The surface of the display device 221 is also provided with a touch panel to accept input operations based on the operation screen. The audio output device 222 outputs various spoken voices and notification sounds. For example, a speaker can be used as the audio output device 222.

[0024] The notification unit 220 displays messages or images on the display device 221, or outputs voice messages or alarm sounds via the voice output device 222, depending on the reception status of the signal transmitted from the transmitter 100. Furthermore, if a device with a vibration function, such as a smartphone, is used as the notification device 200, the notification unit 220 may also notify the user by vibrating the device. The user can learn that there may be a person left inside the child seat CS through these displays and sounds from the notification unit 220 of the notification device 200. The notification unit 220 is an example of a notification means.

[0025] The communication unit 230 receives signals transmitted from the transmitting device 100. The communication unit 230 is equipped with a communication interface that corresponds to radio waves transmitted from the communication unit 130 of the transmitting device 100. The communication unit 230 is an example of a receiving means.

[0026] The control unit 210 evaluates the usage status of the child seat CS based on the status of the signal received by the communication unit 230. The control unit 210 then controls the display device 221 and the audio output device 222 of the notification unit 220 to provide notification based on the evaluation result.

[0027] The evaluation performed by the control unit 210 is whether or not there is a person in the child seat CS, and whether or not the user possessing the notification device 200 has moved to a distance beyond the range of radio waves from the child seat CS (transmitter 100). If there is a person in the child seat CS and the user (notification device 200) has moved to a distance beyond the range of radio waves from the child seat CS (transmitter 100), the control unit 210 evaluates the usage status of the child seat CS as abnormal.

[0028] As described above, the transmitter 100 transmits an ON signal to indicate that a person is in the child seat CS and an OFF signal to indicate that no one is in the child seat CS. Therefore, it is possible to recognize whether or not a person is in the child seat CS based on the type of signal received from the transmitter 100.

[0029] Here, the transmission of signals by the transmitter 100 is performed using short-range communication with a communication distance of approximately 10m. Therefore, if the distance between the transmitter 100 and the notification device 200 increases to a certain extent, the radio waves transmitted from the transmitter 100 will not reach the notification device 200 and will be interrupted. Furthermore, the notification device 200 is to be carried and used by the user. Consequently, if the radio waves transmitted from the transmitter 100 are interrupted, it means that the user possessing the notification device 200 has moved to a distance beyond the range of the radio waves from the child seat CS where the transmitter 100 is installed.

[0030] Based on the above, the control unit 210 evaluates the usage status of the child seat CS based on the type of signal received from the transmitter 100 and the radio wave reception status. An example of the evaluation by the control unit 210 is shown in Figure 4.

[0031] <Evaluation of the usage of the Child Seat CS> Figure 4 shows the evaluation content based on the signal transmitted from the transmitter 100. Figure 4 shows the correspondence between the items "weight detection," "connection status," and "evaluation." The control unit 210 of the notification device 200 performs an evaluation of the usage status of the child seat CS in each scenario, as shown in Figure 4.

[0032] "Weight detection" refers to the detection result of a person when a weight sensor is used in the detection unit 120 of the transmitter 100. The weight sensor, which acts as the detection unit 120, has a threshold value set, and if it detects a weight exceeding the set threshold, the detection result is set to "Yes," and in all other cases, the detection result is set to "No." The transmitter 100 transmits a signal set according to the situation, depending on whether the "weight detection" result is "Yes" or "No." That is, the transmitter 100 transmits an ON signal if the detection result is "Yes," and transmits an OFF signal if the detection result is "No."

[0033] The "Connection Status" indicates whether the transmitter 100 and the notification device 200 are connected, depending on the signal reception status from the transmitter 100. In the diagram, "Connected" indicates that the device is connected, and "Disconnected" indicates that the device is disconnected (not connected). Specifically, the notification device 200 considers the connection between the transmitter 100 and the notification device 200 to be disconnected if the radio waves of the received signal are interrupted. In addition to the complete interruption of the radio waves of the received signal, the connection between the transmitter 100 and the notification device 200 may also be considered disconnected if the strength of the received signal in the notification device 200 (Received Signal Strength Indicator: RSSI) falls below a threshold. Furthermore, the connection between the transmitter 100 and the notification device 200 may also be considered disconnected if the reception level drops drastically from the normal state.

[0034] The "Evaluation" indicates an evaluation of the usage status of the child seat CS. The notification device 200 determines that an "abnormal" situation has occurred when it is determined that a person is in the child seat CS and the parent has left the vehicle C (abandoned state). Referring to Figure 4, the "Evaluation" is "abnormal" when "Weight Detection" is "Yes" and "Connection Status" is "Disconnected".

[0035] The evaluation in each scenario shown in Figure 4 will be explained further. Here, it is assumed that the transmitter 100 repeatedly transmits signals periodically. The notification device 200 determines that the radio waves have been lost if it does not receive a signal at the time when it is expected to receive the next signal after the previous reception. In other words, the notification device 200 determines that the radio waves have been lost if a predetermined amount of time has elapsed since the last time it received a signal from the transmitter 100 and has not received the next signal. In the following explanation, a location close to the transmitter 100 where the notification device 200 can receive radio waves will be described as "a location close to the child seat CS". A location far from the transmitter 100 where the notification device 200 cannot receive radio waves will be described as "a location far from the child seat CS".

[0036] First, let's explain the case where "Weight Detection" is "Yes". In this case, the detection unit 120 in the transmitting device 100 has detected weight, indicating that there is a person in the child seat CS. In this situation, if the "Connection Status" is "Connected", it means that there is a person in the child seat CS and the user is in a location close to the child seat CS. Therefore, the situation in which a child is left unattended in the child seat CS has not occurred. In this case, the control unit 210 of the notification device 200 evaluates it as "Normal".

[0037] On the other hand, if the "connection status" is "disconnected," it means that there is a person in the child seat CS, and the user is in a location away from the child seat CS. In this case, it is possible that the parent (user) has left the car C while leaving the child in the child seat CS. Therefore, the control unit 210 of the notification device 200 evaluates this as "abnormal."

[0038] Next, we will explain the case where "weight detection" is "none". In this case, the detection unit 120 in the transmitting device 100 has not detected any weight, which indicates that there is no one in the child seat CS. In this situation, the situation in which a child is left unattended in the child seat CS does not occur. Therefore, regardless of whether the "connection status" is "connected" or "disconnected", the control unit 210 of the notification device 200 evaluates it as "normal".

[0039] As described above, the notification device 200 evaluates the situation as "abnormal" when "weight detection" is "present" and "connection status" is "disconnected," and the notification unit 220 notifies that there is a possibility that a child has been left unattended in the child seat CS. This notification when the evaluation result is "abnormal" will be referred to as a warning notification below. A warning notification is an example of the first type of notification. In other words, a warning notification is issued when the notification device 200, which is receiving an ON signal, disconnects the connection between the transmitter 100 and the notification device 200. Here, we have described issuing a warning notification when the usage status of the child seat CS is evaluated as "abnormal." In addition, if the usage status of the child seat CS is evaluated as "normal," some kind of notification indicating that the evaluation result is "normal" may be issued.

[0040] If a warning is issued, the user needs to return to the car C to check the situation, as there is a possibility that a child is left in the child seat CS. Therefore, the conditions for stopping the warning may be to require the user to take action to ensure they return to the car C. For example, the resumption of reception of a signal transmitted from the transmitter 100 may be one of the conditions for stopping the warning. Alternatively, the system may be configured to require operation on the transmitter 100 installed in the child seat CS in order to stop the warning.

[0041] Regarding the determination of the "connection status," it was stated that the connection between the transmitter 100 and the notification device 200 is determined to be disconnected in accordance with a decrease in the received signal strength in the notification device 200. However, wireless communication is susceptible to changes in communication status due to the influence of the communication environment. For example, the transmitter 100 is installed in the child seat CS and is therefore located inside the vehicle (inside car C). On the other hand, the notification device 200 is carried by the user and may be located inside the vehicle or outside the vehicle when the user gets out of car C. Furthermore, the range of radio waves transmitted from the transmitter 100 differs depending on whether the doors and windows of car C are open or closed. Therefore, the threshold for determining whether the connection between the transmitter 100 and the notification device 200 has been disconnected based on the received signal strength may be adjustable to appropriately determine the disconnection in the user's environment.

[0042] <Preliminary Notice> Wireless communication is susceptible to interference from the communication environment, which can lead to temporary disconnections. Furthermore, even when communication is not interrupted, or after a disconnection has been restored, the received signal strength may be weak, resulting in unstable communication. Therefore, even when the transmitting device 100 and the notification device 200 are connected, the notification device 200 may, under certain notification conditions, issue a preliminary notification to alert the user, distinct from a warning notification. A preliminary notification is an example of a second type of notification.

[0043] Figure 5 shows an example of the operation of the notification device 200 when it performs a preliminary notification in addition to a warning notification. Here, since the operation of performing a warning notification and a preliminary notification is the focus, the operation related to the reception of the ON signal by the notification device 200 is shown. In this example of operation, it is assumed that the signal is transmitted repeatedly from the transmitter 100 at regular intervals. The time interval at which the ON signal is transmitted is the first time interval. Hereafter, the length of this first time interval will be referred to as the "first time".

[0044] The notification device 200 waits for the next ON signal to be received until a first time has elapsed after the last ON signal was received (NO in S101, NO in S102). If the first time has elapsed without receiving an ON signal (NO in S101, YES in S102), the state is evaluated as "abnormal" as explained with reference to Figure 4. In this case, the notification device 200 issues a warning notification (S103).

[0045] If an ON signal is received before the first time period has elapsed, the notification device 200 determines whether the notification conditions for a preliminary notification are satisfied. If the notification conditions are satisfied (YES in S104), the notification device 200 performs a preliminary notification (S105). On the other hand, if the notification conditions are not satisfied (NO in S104), the reception of the ON signal in the notification device 200 is normal. Therefore, the notification device 200 waits for the first time period to elapse again before receiving an ON signal (S101, S102).

[0046] A preliminary alert is issued when the notification device 200 is receiving radio waves transmitted from the transmitter 100, but the radio wave conditions are unstable and there is a high probability of disconnection. Therefore, the preliminary alert is issued to draw the user's attention to the possibility that a child may be left in the child seat CS at that moment. For this reason, the conditions for stopping the preliminary alert may be simpler than those for a warning alert. For example, as mentioned above as an example of the conditions for stopping a warning alert, the system may be configured so that the user does not need to return to the car C, and the preliminary alert can be stopped simply by operating the notification device 200.

[0047] <Examples of notification conditions for preliminary notifications> An example of a notification condition for preliminary notification will be explained. One example of a notification condition is to set a threshold for the received signal strength of the ON signal. The notification device 200 determines that the notification condition is satisfied if the value of the received signal strength of the received signal is less than the threshold.

[0048] Furthermore, as a second example of a notification condition, a threshold application period may be set. Rather than determining the notification condition based on the threshold for a single signal reception, the notification device 200 determines that the notification condition is satisfied if the value of the received signal intensity of the received signals remains below the threshold for a predetermined period of time.

[0049] Furthermore, as a third example of a notification condition, the frequency at which the signal received by the notification device 200 is interrupted may be set. In the example operation shown in Figure 5, a warning notification was issued when the signal received by the notification device 200 was interrupted once (S101-S103). However, since wireless communication is susceptible to the influence of the communication environment, it is possible that the notification device 200 may be temporarily unable to receive a signal. Therefore, a control that issues a warning notification when the signal is interrupted multiple times in a row can be considered. In such a case, even in the preliminary notification, the notification condition may be set as the number of times the signal is intermittently interrupted multiple times over a certain period. Specifically, the notification device 200 determines that the notification condition is satisfied when the reception of the signal is interrupted more than a predetermined number of times within a predetermined period.

[0050] Furthermore, as a fourth example of a notification condition, when setting the frequency of signal interruptions, the received signal strength before and after the interruption may also be added as a condition. For example, consider a case where the signal is interrupted intermittently multiple times over a certain period. In this case, the notification device 200 may determine that the notification condition is satisfied if the received signal strength of the first signal received after the interruption is weaker than the received signal strength of the last signal received before the interruption.

[0051] Although embodiments of the present invention have been described above, the technical scope of the present invention is not limited to the above embodiments. For example, in the above embodiments, the transmitter 100 is provided on the child seat CS. Here, the transmitter 100 may be integrally incorporated into the child seat CS, or it may be provided in a detachable manner. Alternatively, it may be provided on the seat S of the automobile C instead of the child seat CS. Furthermore, various modifications and substitutions of configurations that do not depart from the technical concept of the present invention are included in the present invention. [Explanation of Symbols]

[0052] 10...Abandoned object notification system, 100...Transmitter, 110...Control unit, 111...Processor, 112...Storage device, 120...Detection unit, 130...Communication unit, 140...Power supply unit, 200...Notification device, 210...Control unit, 211...Processor, 212...Main memory, 213...Secondary memory, 220...Notification unit, 230...Communication unit

Claims

1. A receiving means for receiving a signal indicating whether or not there is a person in a seat inside a car, The system includes a notification means that provides notification based on the content received by the receiving means, The aforementioned notification means is, If a predetermined period of time has elapsed since the last time a signal indicating a person is present in a seat inside the vehicle was received, and no such signal has been received, the first notification will be made. If, after the last time a signal indicating that a person is in a seat inside the vehicle is received, the signal is received again before the predetermined time has elapsed, and the reception condition satisfies the predetermined conditions, then the second notification is made. A notification device characterized by the following.

2. The aforementioned notification means is, The notification device according to claim 1, characterized in that it performs the second notification when the radio waves received from the aforementioned signal are weaker than a threshold.

3. The aforementioned notification means is, The notification device according to claim 2, characterized in that it provides the second notification when the state in which the radio waves are weaker than the threshold continues for a predetermined period of time or longer.

4. The aforementioned notification means is, The notification device according to claim 1, characterized in that it performs the second notification if the reception of the signal is interrupted more than a predetermined number of times within a predetermined period.

5. The aforementioned notification means is, The notification device according to claim 4, characterized in that it provides the second notification when the radio wave strength of the signal received again after the interruption is weaker than the radio wave strength of the signal before the interruption.

6. A transmitter that emits a signal indicating whether or not there is a person in the seat inside the car, The notification means described in claims 1 to 5, An abandoned property notification system characterized by comprising the following features.

7. The transmitting device is A first signal indicating that a person is in the seat inside the vehicle is transmitted at a predetermined first time interval. The abandoned vehicle notification system according to claim 6, characterized in that a second signal indicating that there is no person in the seat inside the vehicle is transmitted at a second time interval different from the first time interval.

8. The abandoned vehicle notification system according to claim 7, characterized in that the second time interval for transmitting the second signal is longer than the first time interval for transmitting the first signal.

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