JP7052268B2 - Submersion determination system and submergence determination method, program - Google Patents

Description

The present invention relates to a submergence determination system, a submergence determination method, and a program.

In Patent Document 1, the distance between the water surface of the bathtub and the upper end of the bather's body is measured by using an ultrasonic wave emitting / receiving device provided on the ceiling of the bathroom, and the bather in the bathtub is measured based on the measurement result. It discloses a technique for determining a submerged state.

Japanese Patent No. 5488995

However, the water surface of the bathtub tends to fluctuate up and down, and the reliability of the above determination result is low.

An object of the present invention is to provide a technique for reliably detecting whether or not a bather in a bathtub is in a bathing posture that may progress to a submerged state.

The submergence determination system of one embodiment is arranged on the upper part of the bathtub, and the ultrasonic wave is transmitted to the bathtub and the reflected wave is received by at least one ultrasonic wave emitting / receiving device and the received reflected wave. Based on this, the crown distance, which is the distance from the at least one ultrasonic generator / receiver to the crown of the bather, and the edge, which is the distance from the at least one ultrasonic generator / receiver to the upper surface of the edge of the bathtub. The distance on the upper surface of the part is calculated, the distance on the crown is compared with the distance on the upper surface of the edge, and based on the comparison result, whether or not the bather is in a bathing posture that may progress to a submerged state. It is provided with a submergence determination device for determining whether or not.
In another embodiment of the submersion determination method, at least one ultrasonic wave emitting / receiving device is arranged on the upper part of the bathtub, ultrasonic waves are transmitted from the at least one ultrasonic wave emitting / receiving device toward the bathtub, and the reflected wave thereof is transmitted. The parietal distance, which is the distance from the at least one ultrasonic emitting / receiving device to the crown of the bather, and the at least one ultrasonic emitting / receiving device based on the transmitting / receiving step and the received reflected wave. The distance on the upper surface of the edge, which is the distance from the receiving device to the upper surface of the edge of the bathtub, is calculated, the distance on the crown is compared with the distance on the upper surface of the edge, and the bather is based on the comparison result. It includes a submergence determination step for determining whether or not the bathing posture may progress to a submerged state.

According to the present invention, as the comparison target of the crown distance, the edge upper surface distance that hardly fluctuates is used, so that the bather in the bathtub may proceed to the submerged state in the bathing posture. It is possible to reliably detect the presence or absence.

It is a schematic diagram of the submergence determination system. (First Embodiment) It is a bird's-eye view of the bathroom. (First Embodiment) It is a figure which shows the bathing posture. (First Embodiment) It is a functional block diagram of a submergence determination device. (First Embodiment) It is explanatory drawing of distance measurement using ultrasonic waves. (First Embodiment) This is the control flow in the submergence determination system. (First Embodiment) It is a functional block diagram of the submergence determination device. (Second Embodiment) It is a bird's-eye view of the bathroom. (Second Embodiment) It is explanatory drawing of distance measurement using ultrasonic waves. (Second Embodiment)

(First Embodiment)
Next, a first embodiment of the present invention will be described with reference to the drawings. In the description of the drawings below, the same or similar parts are designated by the same or similar reference numerals. However, it should be noted that the drawings are schematic, and the relationship between the thickness and the plane dimensions, the ratio of the thickness of each layer, etc. are different from the actual ones. Therefore, the specific thickness and dimensions should be determined in consideration of the following explanation. In addition, it goes without saying that parts having different dimensional relationships and ratios are included between the drawings.

Further, the embodiments shown below exemplify devices and methods for embodying the technical idea of the present invention, and the technical idea of the present invention includes the material, shape, structure, and the like of the components. The arrangement etc. is not specified to the following. The technical idea of the present invention can be modified in various ways within the scope of claims.

(Submersion judgment system)
As shown in FIG. 1, the submersion determination system 1 according to the present embodiment includes an ultrasonic wave generation / reception device 2 and a submersion determination device 3. The ultrasonic wave emitting / receiving device 2 is arranged on the ceiling 5 located above the bathtub 4 in the bathroom, transmits ultrasonic waves toward the bathtub 4, and receives the reflected waves. The ultrasonic wave emitting / receiving device 2 is arranged in the upper part of the bathtub 4. Based on the reflected wave received by the ultrasonic wave generation / reception device 2, the submergence determination device 3 has a crown distance 7D, which is the distance from the ultrasonic wave generation / reception device 2 to the crown 7 of the bather 6, and ultrasonic wave generation / reception. The edge top surface distance 8D, which is the distance from the device 2 to the edge top surface 8 of the bathtub 4, is calculated, the crown distance 7D and the edge top surface distance 8D are compared, and the bather is based on the comparison result. It is determined whether or not 6 is a bathing posture that may progress to a submerged state.

An alarm device 9 is connected to the submergence determination device 3. The submergence determination device 3 and the alarm device 9 can be installed at any place inside or outside the bathroom, and may be built in the ultrasonic wave generation / reception device 2. The ultrasonic wave emitting / receiving device 2, the submergence determination device 3 and the alarm device 9 may be connected to each other by wire, may transmit and receive signals wirelessly, and may be connected via the Internet.

FIG. 2 is a bird's-eye view of the home bathroom as seen from the ceiling 5. As shown in FIG. 2, the ceiling 5 generally has a panoramic view of the bathroom. The bathroom is provided with a washing place 10 and a bathtub 4. The bathtub 4 is filled with hot water 11 for bathing. Drowning in the bathroom causes unconsciousness for some reason when immersed in the hot water 11 of the bathtub 4, or causes the brain or heart to become ischemic due to a rapid drop in blood pressure when standing up to get out of the bathtub 4. It occurs when the head of the bather 6 is submerged in the hot water 11 of the bathtub 4 and the hot water 11 of the bathtub 4 closes the respiratory organs such as the nose and the mouth. Hereinafter, the "submerged state" means a state in which the head of the bather 6 is submerged in the hot water 11 of the bathtub 4.

3 (a) and 3 (b) show the bathing posture of the bather 6 in the bathtub 4. FIG. 3A shows a bathing posture in which the crown 7 of the bather 6 is located sufficiently above the upper surface 8 of the edge. In FIG. 3 (b), for example, the bather 6 cannot support himself / herself due to the loss of consciousness, and the top 7 of the bather 6 is lowered to approach the upper surface 8 of the edge, and the bath is about to be submerged. Shows posture.

The ultrasonic wave emitting / receiving device 2 shown in FIG. 1 intermittently transmits short-time ultrasonic waves toward the entire bathtub 4. Further, the ultrasonic wave emitting / receiving device 2 receives the reflected wave (echo wave) reflected by the transmitted ultrasonic wave from the top 7 of the bather 6, the upper surface 8 of the edge of the bathtub 4, or the accessory of the bathtub 4. ..

As shown in FIG. 4, the submergence determination device 3 includes a pulse generation circuit 20, an oscillation circuit 21, an intermittent circuit 22, a transmission amplifier circuit 23, a transmission / reception switching circuit 24, a reception amplifier circuit 25, a filter circuit 26, and a waveform analysis. The circuit 27, the crown reflected wave extraction unit 28, the edge portion upper surface reflected wave extraction unit 29, the difference calculation unit 30, and the submergence determination unit 31 are provided. The top reflected wave extraction unit 28, the edge top surface reflected wave extraction unit 29, the difference calculation unit 30, and the submergence determination unit 31 are configured by, for example, a logic circuit of a central processing unit (CPU).

The oscillation circuit 21 generates an AC signal in the ultrasonic band. The pulse generation circuit 20 generates a pulse for determining the transmission / reception time of ultrasonic waves, and outputs the pulse to the transmission / reception switching circuit 24, the intermittent circuit 22, and the waveform analysis circuit 27. The intermittent circuit 22 is controlled by a pulse from the pulse generation circuit 20, and makes an AC signal from the oscillation circuit 21 an AC waveform having a pulse-like amplitude. The transmission amplifier circuit 23 amplifies the AC signal from the intermittent circuit 22.

The transmission / reception switching circuit 24 is controlled by a pulse from the pulse generation circuit 20, and switches the transmission / reception of the ultrasonic transmission / reception device 2. The ultrasonic wave emitting / receiving device 2 emits pulsed ultrasonic waves having a short duration toward the bathtub 4. The ultrasonic waves are reflected on the crown 7 of the bather 6, the upper surface 8 of the edge, and the peripheral portion of the bathtub 4, and reach the ultrasonic wave emitting / receiving device 2 again. When the reflected wave arrives, the transmission / reception switching circuit 24 switches the connection destination of the ultrasonic wave generation / reception device 2 to the reception amplifier circuit 25.

The receiving amplifier circuit 25 amplifies the reflected wave received by the ultrasonic wave emitting / receiving device 2. The filter circuit 26 removes frequency components other than the frequency components of the ultrasonic waves transmitted by the ultrasonic wave generation / reception device 2. The output from the filter circuit 26 is input to the waveform analysis circuit 27.

5 (a) and 5 (b) show the received waveforms input to the waveform analysis circuit 27 in each bathing posture shown in FIGS. 3 (a) and 3 (b). (Tx) indicates a transmission waveform as a reference for distance measurement, and (rx) indicates a reception waveform.

As shown in FIGS. 5A and 5B, when ultrasonic waves are transmitted from the ultrasonic wave emitting / receiving device 2 to the bathtub 4, first, the bather at the position closest to the ultrasonic wave emitting / receiving device 2 The received waveform W11 reflected by the crown 7 of 6 is observed, then the received waveform W12 reflected by the upper surface 8 of the edge of the bath 4 is observed, and then the received waveform W13 reflected by the water surface of the hot water 11 is observed. Will be done.

Here, since the bather 6 does not have a sudden movement or a periodic movement, the received waveform W11 corresponding to the bather 6 can be clearly distinguished from other received waveforms. Further, since the edge upper surface 8 is a fixed object, the reception waveform W12 corresponding to the edge upper surface 8 does not change in the reception intensity or the appearance timing. Therefore, the reception waveform W12 corresponding to the edge upper surface 8 is received by another receiver. It can be clearly distinguished from the waveform. Since there is a wave due to a standing wave determined by the shape of the bathtub 4 on the water surface of the hot water 11, the reflected wave corresponding to the water surface of the hot water 11 tends to be periodic and have a relatively short fluctuation period. Therefore, the received waveform W13 corresponding to the water surface of the hot water 11 can be clearly distinguished from other received waveforms.

The waveform analysis circuit 27 shown in FIG. 4 performs envelope detection on the received waveform input from the filter circuit 26, and outputs the envelope detection waveform.

The crown reflected wave extraction unit 28 receives the received waveform W11 from the received reflected wave based on either one or both of the received waveform output from the waveform analysis circuit 27 and the envelope detection waveform thereof, and the top portion 7 of the bather 6. Extracted as a reflected wave at. Further, the edge top surface reflected wave extraction unit 29 uses the received waveform W12 from the received reflected wave at the edge of the bath 4 based on either one or both of the received waveform output from the waveform analysis circuit 27 and the envelope detection waveform thereof. It is extracted as a reflected wave on the upper surface 8 of the portion.

The difference calculation unit 30 is based on the reflected wave (received waveform W11) at the crown 7 of the bather 6 extracted by the crown reflected wave extraction unit 28, and the ultrasonic wave generation / reception device 2 to the crown of the bather 6 The crown distance 7D, which is the distance to 7, is calculated. Further, the difference calculation unit 30 has the ultrasonic wave generation / reception device 2 to the bathtub 4 based on the reflected wave (received waveform W12) on the edge upper surface 8 of the bathtub 4 extracted by the edge upper surface reflected wave extraction unit 29. The edge top surface distance 8D, which is the distance to the edge top surface 8, is calculated. Then, the difference calculation unit 30 compares the crown distance 7D and the edge upper surface distance 8D. Specifically, the difference calculation unit 30 calculates the difference obtained by subtracting the crown distance 7D from the edge upper surface distance 8D.

In the difference calculation unit 30, the crown distance 7D calculates the delay time from the transmission of ultrasonic waves to the reception of the reflected waves at the crown 7 of the bather 6 extracted by the crown reflected wave extraction unit 28. It can be calculated by multiplying the calculated delay time by the propagation velocity of ultrasonic waves.

Similarly, in the difference calculation unit 30, the edge top surface distance 8D is a delay from the transmission of ultrasonic waves to the reception of the reflected waves on the edge top surface 8 of the bathtub 4 extracted by the edge top surface reflected wave extraction unit 29. It can be calculated by calculating the time and multiplying the calculated delay time by the propagation velocity of the ultrasonic wave.

Further, the propagation velocity v (meters per second) of the sound wave at the standard atmospheric pressure in the dry air is obtained by "v = 331.5 + 0.61T" when the air temperature is T degrees Celsius. Therefore, for the crown distance 7D, when the delay time t11 in FIG. 5 is used, it becomes “7D = 0.5 × t11 × v = 0.5 × t11 (331.5 + 0.61T)”, and the edge upper surface distance 8D Is "8D = 0.5 × t12 × v = 0.5 × t12 (331.5 + 0.61T)" when the delay time t12 of FIG. 5 is used. Then, the difference ΔD obtained by subtracting the crown distance 7D from the edge upper surface distance 8D is “ΔD = 8D-7D = 0.5 (t12-t11) (331.5 + 0.61T)”.

The submersion determination unit 31 determines whether or not the bather 6 is in a bathing posture that may progress to a submerged state based on the comparison result between the crown distance 7D and the edge upper surface distance 8D by the difference calculation unit 30. judge. Specifically, the submersion determination unit 31 determines that the bather 6 is in a bathing posture in which the bather 6 may progress to the submerged state when the difference ΔD calculated by the difference calculation unit 30 is equal to or less than a predetermined value. .. Here, the predetermined value is appropriately set within the range of, for example, 15 cm to 30 cm, and is preferably determined according to the size of the head of the bather 6 and the position of the respiratory organs. The predetermined value is set to 25 cm as an example. The predetermined value is stored in advance in a storage device or the like (not shown) of the submergence determination device 3.

The alarm device 9 issues a warning when the submersion determination unit 31 determines that the bather 6 is in a bathing posture that may progress to a submerged state.

(Submersion judgment method)
Next, with reference to FIG. 6, a submergence determination method using the submersion determination system 1 according to the embodiment of the present invention will be described.

Step S100:
First, the ultrasonic wave emitting / receiving device 2 transmits ultrasonic waves toward the bathtub 1. The transmitted ultrasonic waves are reflected by the bather 6, the upper surface of the edge 8, the water surface of the hot water 11, and the reflected waves are received by the ultrasonic wave generation / reception device 2.

Step S110:
Next, the waveform analysis circuit 27 outputs the waveform of the reflected wave received by the ultrasonic wave emitting / receiving device 2 and the envelope detection waveform thereof.

Step S120:
Next, the crown reflected wave extraction unit 28 receives the received waveform W11 among the received reflected waves at the crown 7 of the bather 6 based on the received waveform output from the waveform analysis circuit 27 and the envelope detection waveform thereof. It is extracted as a reflected wave of.

Step S130:
Next, the edge top surface reflected wave extraction unit 29 uses the received waveform W12 of the received reflected waves based on the received waveform output from the waveform analysis circuit 27 and the envelope detection waveform thereof, and the edge top surface 8 of the bathtub 4. Extracted as a reflected wave in.

Step S140:
Next, the difference calculation unit 30 calculates the crown distance 7D based on the reflected wave at the crown 7 of the bather 6 extracted by the crown reflected wave extraction unit 28. Similarly, the difference calculation unit 30 calculates the edge upper surface distance 8D based on the reflected wave on the edge upper surface 8 of the bathtub 4 extracted by the edge upper surface reflected wave extraction unit 29. Then, the difference calculation unit 30 calculates the difference ΔD by subtracting the crown distance 7D from the edge upper surface distance 8D.

Step S150:
Next, the submergence determination unit 31 determines whether the difference ΔD is equal to or less than a predetermined value. When the submergence determination unit 31 determines that the difference ΔD is not equal to or less than a predetermined value, the process ends. On the other hand, when the submergence determination unit 31 determines that the difference ΔD is equal to or less than a predetermined value, the alarm device 9 issues an alarm in step S160 and ends the process.

The series of procedures shown in FIG. 6 can be executed by controlling the submergence determination system 1 shown in FIG. 1 by a program of an algorithm equivalent to that of FIG. This program may be stored in a storage device or the like (not shown). Further, the program can be stored in a computer-readable recording medium, and the recording medium can be read by the storage device to execute a series of procedures according to the embodiment of the present invention.

Although the first embodiment of the present invention has been described above, the first embodiment has the following features.

That is, the submergence determination system 1 is arranged on the ceiling 5 located above the bathtub 4 of the bathroom, emits ultrasonic waves toward the bathtub 4, and receives the reflected waves. Based on the reflected wave, the distance from the ultrasonic wave emitting / receiving device 2 to the crown 7 of the bather 6 is 7D, and the distance from the ultrasonic emitting / receiving device 2 to the upper surface 8 of the edge of the bathtub 4. A certain edge top surface distance 8D is calculated, the crown distance 7D and the edge top surface distance 8D are compared, and based on the comparison result, the bather 6 is in a bathing posture in which the bather 6 may progress to a submerged state. A submergence determination device 3 for determining the presence or absence is provided. According to the above configuration, since the edge upper surface distance 8D, which hardly fluctuates, is used as the comparison target of the crown distance 7D, the bather 6 in the bathtub 4 may progress to the submerged state. It is possible to reliably detect whether or not the person is in a bathing posture.

Further, the submersion determination device 3 is in a bathing posture in which the bather 6 may proceed to a submerged state when the difference ΔD obtained by subtracting the crown distance 7D from the edge upper surface distance 8D becomes a predetermined value or less. judge. According to the above configuration, it is possible to detect by a simple calculation that the bather 6 is in a bathing posture that may progress to a submerged state.

Further, in the submergence determination method, an ultrasonic emission / reception device 2 is arranged on the ceiling 5 located above the bathtub 4 of the bathroom, ultrasonic waves are transmitted from the ultrasonic emission / reception device 2 toward the bathtub 4, and the reflected wave thereof is transmitted. Based on the transmission / reception step (S100) and the received reflected wave, the crown distance 7D, which is the distance from the ultrasonic generation / reception device 2 to the crown 7 of the bather 6, and the ultrasonic transmission / reception device The edge top surface distance 8D, which is the distance from 2 to the edge top surface 8 of the bathtub 4, is calculated, and the crown distance 7D and the edge top surface distance 8D are compared (S140), and based on the comparison result, It includes a submergence determination step (S110-S150) for determining whether or not the bather is in a bathing posture that may progress to a submerged state (S150). According to the above method, since the edge upper surface distance 8D, which hardly fluctuates, is used as the comparison target of the crown distance 7D, the bather 6 in the bathtub 4 may progress to the submerged state. It is possible to reliably detect whether or not the person is in a bathing posture.

An underwater ultrasonic sensor may be provided in the bathtub 4, and the presence or absence of a bather may be determined prior to the submergence determination by the ultrasonic sensor.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIGS. 7 to 9.

In the first embodiment, as shown in FIG. 4, it is assumed that the submergence determination system 1 includes only one ultrasonic wave emitting / receiving device 2. On the other hand, in the present embodiment, as shown in FIG. 7, the submergence determination system 1 includes a long-side side ultrasonic wave generation / reception device 40, a short-side side ultrasonic wave generation / reception device 41, and as ultrasonic wave generation / reception devices. It is equipped with. Further, the submergence determination device 3 further includes a directivity switching circuit 32 and a directivity switching control circuit 33.

As shown in FIG. 8, the bathtub 4 has a long side direction corresponding to the vertical direction of the paper surface and a short side direction corresponding to the horizontal direction of the paper surface in a plan view. The bathtub 4 has a longitudinal direction corresponding to the vertical direction of the paper surface and a lateral direction corresponding to the horizontal direction of the paper surface in a plan view.

The long-side ultrasonic wave emitting / receiving device 40 is configured to be capable of transmitting ultrasonic waves having a wide directivity in the long-side direction and a narrow directivity in the short-side direction of the bathtub 4, as shown by the elliptical broken line indicated by the reference numeral 40a in FIG. Has been done. According to the wide directivity in the long side direction of the bathtub 4, the ultrasonic wave is transmitted toward the crown 7 of the bather 6 without any problem regardless of which direction the bather 6 is bathing. It is preferable that the ultrasonic waves transmitted by the long-side ultrasonic wave emitting / receiving device 40 are transmitted only to the region inside the upper surface 8 of the edge portion of the bathtub 4.

The short-side ultrasonic wave emitting / receiving device 41 is configured to be capable of transmitting ultrasonic waves having a narrow directivity in the long-side direction and a wide directivity in the short-side direction of the bathtub 4, as shown by the elliptical broken line indicated by the reference numeral 41a in FIG. Has been done. Preferably, the ultrasonic wave transmitted by the short side ultrasonic wave emitting / receiving device 41 is transmitted to a region including the upper surface 8 of the edge portion on the long side side of the bathtub 4 and not including the upper surface surface 8 of the edge portion on the short side side of the bathtub 4. It should be done. Further, it is preferable that the center of the region of the ultrasonic wave transmitted by the short side ultrasonic wave emitting / receiving device 41 substantially coincides with the center in the long side direction and the center in the short side direction of the bathtub 4 in a plan view. According to the above directivity, ultrasonic waves are not transmitted toward the crown 7 of the bather 6.

In addition, various known means already known can be applied in order to impart directivity to the ultrasonic waves transmitted by the long-side side ultrasonic wave generation / reception device 40 and the short-side side ultrasonic wave generation / reception device 41. For example, the first is to give the ultrasonic radiation surface a slight unevenness. That is, the convex portion of the ultrasonic radiation surface has an action of widening the directivity, and the concave portion has an action of narrowing the directivity. Secondly, if the wall thickness of the case accommodating the piezoelectric element is made non-uniform, vibration is suppressed in the thick portion, and non-uniform directivity can be obtained.

Returning to FIG. 7, the directivity switching control circuit 33 outputs a control signal to the directivity switching circuit 32 at predetermined time intervals.

The directivity switching circuit 32 connects the long-side ultrasonic wave generation / reception device 40 and the short-side ultrasonic wave transmission / reception to the connection destination of the transmission / reception switching circuit 24 each time a control signal is input from the directivity switching control circuit 33. Switch between devices 41. With the above configuration, the long side ultrasonic wave emitting / receiving device 40 and the short side ultrasonic wave emitting / receiving device 41 are configured to transmit / receive ultrasonic waves at different timings. For example, the transmission / reception of ultrasonic waves by the long-side side ultrasonic wave generation / reception device 40 and the transmission / reception of ultrasonic waves by the short-side side ultrasonic wave generation / reception device 41 are executed alternately.

According to the above configuration, the ultrasonic waves transmitted from the long-side ultrasonic wave emitting / receiving device 40 are easily reflected by the crown 7 of the bather 6 and are difficult to be reflected by the upper surface 8 of the edge of the bathtub 4. Therefore, as shown in FIG. 9A, the reception waveform W11 corresponding to the crown 7 of the bather 6 appears in the reception waveform of the long-side ultrasonic wave generation / reception device 40, but is on the upper surface 8 of the edge portion. The corresponding received waveform W12 hardly appears. Therefore, by analyzing the received waveform in the long-side ultrasonic wave emitting / receiving device 40, the received waveform W11 corresponding to the crown 7 of the bather 6 can be distinguished from the received waveform W12 corresponding to the upper surface 8 of the edge portion and surely. Will be able to extract to.

Similarly, the ultrasonic waves transmitted from the short-side ultrasonic wave emitting / receiving device 41 are difficult to be reflected by the crown 7 of the bather 6, and are easily reflected by the upper surface 8 of the edge of the bathtub 4. Therefore, as shown in FIG. 9B, the reception waveform W11 corresponding to the crown 7 of the bather 6 hardly appears in the reception waveform of the short-side ultrasonic wave generation / reception device 41, but the upper surface of the edge portion. The received waveform W12 corresponding to 8 appears. Therefore, by analyzing the reception waveform of the short-side ultrasonic wave generation / reception device 41, the reception waveform W12 corresponding to the upper surface surface 8 of the edge portion is distinguished from the reception waveform W11 corresponding to the crown 7 of the bather 6 and surely. Will be able to extract to.

Then, the submergence determination device 3 calculates the crown distance 7D based on the reflected wave corresponding to the long side ultrasonic wave emitting / receiving device 40, and is based on the reflected wave corresponding to the short side ultrasonic wave emitting / receiving device 41. The edge top surface distance 8D is calculated. According to the above configuration, the crown distance 7D and the edge upper surface distance 8D can be reliably calculated.

As described above, it goes without saying that the present invention includes various embodiments not described here. Therefore, the technical scope of the present invention is defined only by the invention extraction matters relating to the reasonable claims from the above description.

1 Submersion judgment system 2 Ultrasonic wave generation / reception device 3 Submersion judgment device 4 Bathtub 5 Ceiling 6 Bather 7 Head top 7D Head top distance 8 Edge top surface 8D Edge top surface distance 9 Alarm device 10 Washing area 11 Hot water 20 Pulse generation circuit 21 Oscillation Circuit 22 Intermittent circuit 23 Transmission amplifier circuit 24 Transmission / reception switching circuit 25 Reception amplification circuit 26 Filter circuit 27 Waveform analysis circuit 28 Head top reflected wave extraction unit 29 Edge top surface reflected wave extraction unit 30 Difference calculation unit 31 Submersion determination unit 32 Directional switching circuit 33 Directional switching control circuit 40 Long-side side ultrasonic wave emission / reception device 41 Short-side side ultrasonic wave emission / reception device W11 Received waveform W12 Received waveform W13 Received waveform

Claims (5)

It is placed on the upper part of a bathtub having a long side direction and a short side direction in a plan view, emits ultrasonic waves having a wide directivity in the long side direction of the bathtub, and receives the reflected wave in the long side direction . , Long side ultrasonic wave generator / receiver ,
An ultrasonic wave emitting / receiving device on the short side, which is arranged on the upper part of the bathtub, emits ultrasonic waves having a wide directivity in the short side direction of the bathtub, and receives the reflected wave in the short side direction, which is the reflected wave .
The crown distance, which is the distance from the long-side ultrasonic wave emitting / receiving device to the bather's crown, is calculated based on the long-side reflected wave, and the short side is calculated based on the short-side reflected wave . The distance on the upper surface of the edge, which is the distance from the side ultrasonic emitting / receiving device to the upper surface of the edge of the bath, is calculated, the distance on the crown is compared with the distance on the upper surface of the edge, and based on the comparison result, the said A submersion determination device that determines whether or not the bather is in a bathing posture that may progress to a submerged state.
With,
Submergence judgment system. The submergence determination system according to claim 1.
The submersion determination device determines that the bather is in a bathing posture in which the bather may progress to a submerged state when the difference obtained by subtracting the crown distance from the edge upper surface distance is equal to or less than a predetermined value.
Submergence judgment system. The submergence determination system according to claim 1 or 2.
The long-sided ultrasonic wave emitting / receiving device and the short-sided ultrasonic wave emitting / receiving device are configured to transmit / receive the ultrasonic waves at different timings .
Submergence judgment system. Using the long-sided ultrasonic wave emitting / receiving device arranged on the upper part of the bathtub having the long-side direction and the short-sided direction in a plan view, ultrasonic waves having a wide directivity in the long-side direction of the bathtub are transmitted and reflected. A step that receives a long-side reflected wave that is a wave, and
Using the short-side ultrasonic wave emitting / receiving device arranged on the upper part of the bathtub, ultrasonic waves having a wide directivity in the short-side direction of the bathtub are transmitted, and the reflected wave in the short-side direction is received. Steps and
The crown distance, which is the distance from the bather's crown to the bather's crown, is calculated based on the long-side reflected wave, and the short-side super is based on the short-side reflected wave. The distance on the upper surface of the edge, which is the distance from the sound emitting / receiving device to the upper surface of the edge of the bathtub, is calculated, the distance on the crown is compared with the distance on the upper surface of the edge, and the bather is based on the comparison result. The step of determining whether or not the bathing posture may progress to a submerged state, and
including,
Submergence judgment method. On the computer
The submergence determination method according to claim 4 is executed.
program.

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