JP2001195676A - Device for detecting bathing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bathing detecting device capable of correctly detecting a bathing person in a bathtub with a simple configuration and supporting the proper bathing action of him or her. SOLUTION: The device is provided with at least a pair of electrodes 3 arranged or to be arranged at a position touchable to hot water in the bathtub 2 and a signal processing part 4 for judging that the bathing person exists in the bathtub 2 when electric signals introduced by the electrodes 3 are processed to detect an electrocardiac signal. A display output part 5 for outputting a bathing display D1 which indicates the existence of the bathing person based on a detection result when the part 4 detects him or her in the bathtub 2 or a bathing time display D2 which indicates the bathing display and a bathing continuity time is formed in an out of bathroom remote controller 6b disposed outside the bathroom, which is a remote controller 6 for setting the hot water temperature of a hot water supplier by which hot water is supplied to the bathroom 2 or to the hot water supply port inside the bathroom.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bathing detecting device capable of detecting a bather taking a bath in a bath tub with high accuracy and further preventing a bather from drowning in the bath tub.

[0002]

BACKGROUND OF THE INVENTION Drowning due to a drowning accident in a bathtub has been reported to be the leading cause of accidental death at home. Deaths during bathing are classified into drowning, which is the accidental death described above, and sickness and death caused during bathing such as heart disease. The sum of these, bathing deaths is estimated at about 10,000 people nationwide annually, and the number of deaths is comparable to traffic accident deaths. In particular, many elderly people die from bathing, which is a major problem. Bathing deaths occur frequently in winter, and are caused by the magnitude of blood pressure fluctuation accompanying bathing. In particular, as a high risk act during bathing, there is an act of getting up from the bathtub from a state of being immersed in the bathtub. When immersed in a bathtub, peripheral blood vessels expand due to the thermal effect, blood circulation is improved, and blood pressure is reduced. Furthermore, when the user stands up in that state, the blood moves to the bottom under the influence of gravity, so that the brain and heart fall into an ischemic state, which increases the possibility of causing brain disease or heart disease.
Even a healthy person may have symptoms such as lightheadedness when getting out of the bathtub. Loss of consciousness in the bathtub often leads to drowning in the bathtub. Even if you fall down in the bathtub, your head or shoulders may be caught on the edge of the bathtub, etc., to avoid drowning. When examining the case of drowning in the bathtub, in a deep Japanese bathtub with a short longitudinal dimension, it prone and drowned,
In a shallow Western-style bath tub with a long longitudinal dimension, the person often lies on his back and drowns. In some cases, sickness or accidental death occurs in the washing room, but death in the bathroom is overwhelmingly in the bathtub. If the nose and mouth submerge due to some abnormality while immersed in the bathtub, breathing stops, and after 1-2 minutes, the heart stops. Even if breathing stops and oxygen is no longer supplied to the brain, it can be detected early and resuscitated by artificial respiration or cardiac massage. The relationship between submersion time and resuscitation rate is 90% for 2 minutes, 75% for 3 minutes, 50% for 4 minutes,
It is reported to be 25% in 5 minutes. That is, drowning during bathing (drowning in water, including cases that do not lead to drowning)
It can be seen that even if the nose and mouth submerge, the possibility of resuscitation increases if found early.

[0003] Conventionally, it has been suggested that it is necessary to change the form of bathing to prevent death from bathing. For example, the use of a bathroom heater or the use of a second hot water to raise the temperature in the bathroom to reduce the cold exposure to bathers, suppress the blood pressure fluctuations during bathing by applying hot water before bathing, or A half-body bath soaked in hot water up to Hatoo was proposed. In particular, half-body bathing, which has not been practiced so far, has been widely proposed as being effective in relieving fatigue and insomnia and in relieving coldness and back pain.

[0004] In addition to the above-mentioned enlightenment of proper bathing behavior, when a drowning state during bathing or when there is a high risk of drowning is detected, drowning or drowning accidents occur. It is pointed out that there is a need to prevent this. by the way,
In order to detect a drowning state and its danger, it is important to accurately detect that a bather is present in a bathtub. In other words, if there is a risk that the bather may erroneously detect that the bather is in the bathtub or is in a preliminary state while the bather is out of the bathtub or not in the bathtub, the drowning state, etc. The reliability of the detection result of the system is reduced, and the result cannot be used appropriately and effectively.

Conventionally, as a bathing detecting device for detecting whether or not a bather is present in a bathtub, a water level sensor for detecting the water level in the bathtub by, for example, the water pressure in the bathtub is used.
There is a configuration in which a bather can detect an entering / exiting operation into / from a bathtub from the fluctuation of the water level. In addition to the bath detecting device using a water level sensor, there is a device configured so that an operation of a bather in a bathtub can be identified from a moving image. However, in the case of a bath detecting device using a water level sensor, in order to detect a bather's entering / exiting operation into the bathtub only by fluctuations in the water level, when water is put into the bathtub by a tub or the like, or when the water is pumped out. There is a possibility that the water level may change and the input / output operation may be erroneously detected, or the input / output operation of a small child may not be detected. Further, in the case of a bathing detection device based on moving image recognition, the entire surface of the image receiving camera may be fogged by steam, and accurate detection may not be possible due to fluctuations in brightness in the bathroom.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object to provide a bathing detecting device which can accurately detect a bather in a bathtub with a simple configuration. It is still another object of the present invention to provide a bathing detection device that can support a bather in appropriate bathing behavior.

[0007]

A first feature of the bath detecting apparatus according to the present invention for achieving the above object is as described in claim 1 of the claims. It is determined that there is a bather in the bathtub when at least one pair of electrodes installed or installable at a position where the bathtub can be contacted and an electrocardiographic signal detected by processing an electric signal guided to the electrode. And a signal processing unit.

[0008] In the second feature configuration, in addition to the first feature configuration, the signal processing unit detects a bather in the bathtub, in addition to the first feature configuration. In this case, a display output unit that outputs a bathing display indicating the presence of a bather or a bathing time display indicating the bathing continuation time based on the detection result is provided.

[0009] In the third feature configuration, in addition to the first or second feature configuration, the signal processing unit may include a bather in the bathtub, in addition to the first or second feature configuration. Is detected, and a bathing time alarm means for generating a predetermined alarm when the bathing continuation time exceeds a predetermined appropriate bathing time is provided.

[0010] In a fourth aspect of the present invention, in addition to the third aspect, a hot water temperature measuring means for measuring the temperature of the hot water in the bathtub is provided. Prepared,
The appropriate bathing time is that a value corresponding to the hot water temperature measured by the hot water temperature measuring means is used.

According to a fifth feature of the present invention, in addition to the first, second, third or fourth feature of the present invention, the signal processing unit may further include: The present invention is characterized in that there is provided a bathing time alarm means for generating a predetermined alarm when a bather in the bathtub is detected and the bathing start time is outside a predetermined time zone.

The operation and effect will be described below. According to the first characteristic configuration of the bathing detection device according to the present invention, when a bather is present in the bathtub, electrocardiographic signals emitted from human body parts located on the left and right across the heart are respectively applied to each human body part. Since the at least one pair of electrodes provided close to each other is guided through the hot and cold water in the bathtub, the signal processing unit detects an electrocardiographic signal guided to each electrode, so that the bather is in the bathtub. This can be accurately detected without being affected by the fluctuation of the bathtub water level and the fluctuation of the environment in the bathroom.

[0013] According to the second characteristic configuration, the bathing behavior of the bather can be grasped even from a place away from the bathroom by the bathing display and the bathing time display output to the display output unit. Bathing behavior can be monitored, and appropriate bathing behavior by cohabitants can be supported. Further, when the bathing time display is also output, the bathing continuation time can be ascertained, so that the cohabitants can take appropriate bathing action support for the bather according to the bathing continuation time. Further, when the bathing time display is displayed in the bathroom, the bather can judge the bathing continuation time by himself based on the display, and also in this case, the bather can be assisted in appropriate bathing behavior.

[0014] According to the third characteristic configuration, the alarm generated by the bathing time alarm means allows the cohabitants and the like to recognize that the bather exceeds the proper bathing time and takes a long time. Bathers can take appropriate bathing behavior support and rescue measures according to the situation. Further, when such a situation is caused by a drowning accident, drowning can be prevented by early rescue.

[0015] According to the fourth characteristic configuration, even when bathing is continued for the same time, when the bath temperature is higher than a proper bath temperature suitable for the age and health condition of the bather, or when the bath temperature is low, conversely. Since the burden on the body increases, by adjusting the appropriate bathing time according to the hot water temperature measured by the hot water temperature measuring means, it is possible to detect an increase in the physical burden on the bather at an early stage, and the third feature described above. The function and effect of the configuration are more effectively exhibited.

[0016] According to the fifth characteristic configuration, by the alarm generated by the bathing time alarm means, the cohabitants and the like are allowed to enter the bathing room by the bather during a predetermined time period, for example, late at night other than the normal bathing time period. Since it is possible to recognize that a person or the like has taken a bath, it is possible to take appropriate bathing action support or attention to the bather according to the situation.

[0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a bath detecting device according to an embodiment of the present invention. As shown in FIG. 1, the bathing detection device 1 has, as a basic configuration, a pair of electrodes 3 installed at positions that can contact hot and cold water in a bathtub 2.
A signal processing unit 4 that detects an electrocardiographic signal guided to each electrode 3 through the hot and cold water in the bathtub 2 and determines that there is a bather in the bathtub 2, and based on a bathing detection result of the signal processing unit 4. The display output unit 5 outputs a bathing display D1 indicating the presence of a bather and a bathing time display D2 indicating a bathing continuation time.

Here, the pair of electrodes 3 is a plurality of conductive members already provided in the bathtub 2 and is a human body part which is divided into right and left sides of a bather's heart in a normal bathing posture, for example, both right and left hands. The conductive member located at a position close to the neck or the right wrist and the left ankle can be used as it is.

The signal processing unit 4 is formed in a remote control device 6 for setting a hot water supply temperature of a water heater (not shown) for supplying hot water into the bathtub 2, and is provided between the electrode 3 and the signal processing unit 4. Are electrically connected via the lead wire 3a. As shown in FIG. 2, the signal processing unit 4 includes a potential difference between the weak electrocardiogram signals induced through the hot and cold water between the pair of electrodes 3 (hereinafter, a potential difference signal for distinguishing from a monopolar electrocardiogram signal and a potential difference signal). And an amplifying unit 7 for amplifying the low frequency noise of 10 Hz or less and the power supply noise having a component of the commercial power supply frequency and its harmonic components due to fluctuation of water superimposed on the electrocardiographic signal from the potential difference signal. A noise removing unit 8 having a band-pass filter having a bandwidth of 10 to 35 Hz, an A / D converting unit 9 for A / D converting a potential difference signal after noise removal at a constant sampling cycle, and an A / D converted potential difference It comprises a digital signal processing unit 10 for digitally processing a signal to derive a heart rate and an electrocardiographic waveform of a bather, and a display output unit 5 for outputting and displaying the derived heart rate and electrocardiographic waveform. The digital signal processing unit 10 determines that the intensity of the potential difference signal sequentially A / D-converted by the bathing detection unit 10a at a constant sampling cycle is equal to or higher than a predetermined threshold as a peak of the R wave, and the peak interval (seconds). Is determined, and when the R wave is generated periodically, it is determined that the electrocardiographic signal has been detected, and the internal state is set as a bathing detection state. When the amplification unit 7 has a low-frequency cutoff characteristic in which the amplification factor for a signal component of 10 Hz or less is reduced as the frequency characteristic, the noise removal unit 8 has three frequencies.
It suffices to have a high-frequency cutoff characteristic for removing a signal component of 5 Hz or more. Further, the amplifying unit 7 or the amplifying unit 7 and the noise removing unit 8 may not be provided in the remote control device 6 but may be provided separately near the respective electrodes 3. In this case, power supply to the amplification unit 7 and the like is performed from the remote control device 6 side.

The remote control device 6 is constructed by connecting a remote control 6a installed in a bathroom and a remote control 6b installed outside a bathroom such as a kitchen so as to be able to communicate with each other. The section from the amplification section 7 of the section 4 to the digital signal processing section 10 is formed in a remote controller 6a in the bathroom,
The same display output unit 5 is formed on both the remote controller 6a in the bathroom and the remote controller 6b outside the bathroom. The A / D converter 9 and the digital signal processor 10 are configured using a microcomputer 11 provided for processing such as setting of hot water supply temperature and hot water supply amount of the remote controller 6a in the bathroom. The microcomputer 11 has an analog input terminal,
A model incorporating an A / D converter for A / D converting the analog input is used. Note that the A / D converter forms the A / D conversion section 9, but may be configured by an external circuit. A 12 V DC power line 6c is laid between the remote controller 6a in the bathroom, the remote controller 6b outside the bathroom, and the water heater. Signal transmission and reception between the remote controller 6a in the bathroom, the remote controller 6b outside the bathroom, and the water heater are performed by the power source. Data transmission from the digital signal processing unit 10 of the remote controller 6a in the bathroom to the display output unit 5 of the remote controller 6b outside the bathroom is similarly performed via the power line 6c. For this reason, there is no need to separately perform wiring work or install a wireless device for data transmission between the digital signal processing unit 10 and the display output unit 5.

The display output unit 5 comprises a liquid crystal or LED display device for displaying a bathing display D1 and a bathing time display D2, and a peripheral circuit for driving and controlling the bathing display D1. Are displayed on the basis of the output signal indicating the above. The display output unit 5 is integrally formed with a display unit for displaying a set temperature, a set hot water supply amount, or a time provided as an original function of the remote controller 6a in the bathroom and the remote controller 6b outside the bathroom by using the same display device. It is configured. FIG. 3 shows a display example of the bathing display D1 and the bathing time display D2 output to the display output unit 5. Bathing indication D1
Displays an illustration indicating that there is a bather in the bathtub together with the character display of "during bathing". Further, the illustration display may be changed in display color as the bathing continuation time elapses. For example, the bather's “warm-up degree” is determined from the bathing continuation time and displayed in shades of red.

The digital signal processing unit 10 performs the following processing by using a clock means 12 and a timer means 13 built in or external to the microcomputer 11. First, when the bath detection unit 10a detects a bath and enters a bath detection state,
The bathing time measuring unit 10b starts measuring the bathing continuation time using the timer means 13. The bathing duration is output to the display output unit 5 in a predetermined signal format. The bathing duration is determined by the bathing time determination unit 10c of the digital signal processing unit 10.
Is also output. The bathing time determination unit 10c compares the appropriate bathing time and the bathing continuation time previously input via a predetermined data input mechanism, and outputs a bathing time excess signal S1 when the bathing continuation time exceeds the appropriate bathing time. Output. Further, the bathing time judging unit 10d of the digital signal processing unit 10 temporarily stores the time when the bathing detection state is reached by using the clock means 12 as the bathing start time, and is input in advance through the data input mechanism. It is determined whether or not it is in the bathing time zone, and if not, it outputs a bathing time abnormality signal S2. The data input mechanism can use the temperature setting input means provided in the remote controller 6a in the bathroom or the remote controller 6b outside the bathroom.

A hot water temperature measuring means 14 for measuring the hot water temperature in a hot water supply or reheating pipe communicating with the bathtub 2 is provided, and the measured hot water temperature is supplied to another analog input terminal of the microcomputer 11. Are input to the A / D converter. The A / D converted hot water temperature data is used by the bathing time determination unit 10c to adjust the appropriate bathing time. Specifically, the hot water temperature in the bathtub 2 is estimated from the hot water temperature data, and when the hot water temperature is higher than a predetermined upper limit of an appropriate hot water temperature or lower than the lower limit value, the difference is determined. Accordingly, the appropriate bathing time is shortened, and the adjusted appropriate bathing time is used for determining whether or not the bathing continuation time exceeds the appropriate bathing time.

Further, in addition to the above-described basic configuration, a bathing time excess signal S1 and a bathing time abnormal signal S2 output by the bathing time determining unit 10c and the bathing time determining unit 10d of the digital signal processing unit 10 are respectively received and predetermined. Bathing time warning means 15a for generating warnings such as warning sound, warning message, warning light, etc.
Alarm means 15 which integrates the bath time alarm means 15b
Are provided on both the bathroom remote control 6a and the bathroom remote control 6b. The transmission of the excessive bathing time signal S1 and the abnormal bathing time signal S2 to the alarm means 15 provided in the remote controller 6b outside the bathroom is performed via the power supply line 6c between the remote controller 6a in the bathroom and the remote controller 6b outside the bathroom. The alarm generated by the bathing time alarm means 15a or the bathing time alarming means 15b allows the bather or a third person, such as a housemate, to indicate that the bathing continuation time of the bather is long or that the bathing time is in a normal bathing time zone. Therefore, it is possible to prevent a proper bathing action from being promoted or a drowning accident from occurring.

The bathtub 2 is a high-performance bathtub such as a so-called bubble bath or jet bath having a bubble port for blowing air bubbles and a jet outlet for jetting a jet water stream, even if it is a general popular type bathtub. There may be a conductive member that can be used as the electrode 3 at a position in the bathtub 2 that comes into contact with hot or cold water. For example, in the case of the high-performance bathtub 2, as shown in FIG. 4, a bubble port 16 and a drain port 17 for blowing air bubbles on the bottom surface 2 a, a water jet port 18 for jetting a jet water stream on the back surface 2 b, A hot water supply port 19 from the water heater on the inner wall surface 2c, and a metal handrail 2 on the left and right inner wall side surfaces 2d.
In the seating posture of the bather, the metal frame is provided at the peripheral portion of the bubble port 16, the drain port 17 and the water jet port 18, the metal bath adapter 19 a provided at the hot water supply port 19, and the handrail 20. Those located on the left and right sides of the heart can be used as the pair of electrodes 3. When the metal frame at the peripheral portion of the bubble port 16 or the water jet port 18 is used as the electrode 3, the vicinity of the surface of the metal frame which becomes the electrode 3 due to the bubbles or water flow ejected from the bubble port 16 or the water jet port 18 is used. 10Hz due to fluctuation of water because hot water is constantly stirred
This has the effect of suppressing the formation of an electric double layer between the electrode 3 and the hot and cold water in the bathtub 2 which cause the following low frequency noise. Further, the conductive member used as the electrode 3 is not necessarily limited to those exemplified in the above embodiment. For example, in order to recirculate the hot water in the bathtub 2 between the bathtub 2 and the water heater for reheating the water or purifying the water quality,
A metal frame at the periphery of the water intake provided on the inner wall surface 2c or the like of the bathtub 2 or a carbon material for water purification attached to the water intake may be used.

Each lead wire 3 individually connected to the electrode 3
a is laid beforehand on the bathtub wall, the end opposite to the electrode 3 and the like is gathered at a predetermined location on the outer wall surface of the bathtub, and the space between the end of each lead wire 3a and the signal processing unit 4 during construction. Make an electrical connection. Thus, the electrocardiographic signal guided to the electrode 3 is transmitted to the signal processing unit 4.

Another embodiment will be described below. <1> In the above-described embodiment, the electrode 3 is configured to use an existing conductive member in the bathtub 2.
Independent conductive members are used as the left and right inner wall side surfaces 2 of the bathtub 2.
A member provided separately for d may be used.

<2> Further, as shown in FIG. 5, at least one pair of independent electrodes 21 which can be mounted in the bathtub 2 may be used. The electrode 21 is formed on a front surface of a disk-shaped housing 22, and has a suction cup or an adhesive structure whose back surface can be adsorbed on the inner wall surface of the bathtub 2. Amplifying means 23 for amplifying an electrocardiographic signal guided to the electrode 21 inside the housing 22;
A transmitting unit 24 for wirelessly transmitting the amplified electrocardiographic signal to the signal processing unit 4 and a power supply 25 such as a small battery for supplying power to the amplifying unit 23 and the transmitting unit 24 are accommodated. The signal processing unit 4 is provided with a receiving unit 26 for receiving the electrocardiographic signal transmitted from the transmitting unit 24, and amplifies the potential difference signal between the electrocardiographic signals of the electrodes 21 received by the receiving unit 26 according to the above embodiment. The signal is input to the unit 7, and the same signal processing as in the above embodiment is performed to measure an electrocardiographic waveform and a heart rate. The receiving means 26 is preferably provided on a remote controller 6a in the bathroom, which is installed in the bathroom. Further, as a medium of the radio signal, a radio wave for special low power and having a frequency of about 400 to 600 MHz can be used.

<3> In the above embodiment, the display output unit 5
Are provided in the remote controller 6a in the bathroom and the remote controller 6b outside the bathroom.
May be provided in only one of them. Further, the display output unit 5 is connected to the remote controller 6a in the bathroom and the remote controller 6b outside the bathroom.
, And may be separately provided as an independent device.

<4> In the above-described embodiment, the alarming means 15 integrating the bathing time alarming means 15a and the bathing time alarming means 15b is provided in both the remote controller 6a in the bathroom and the remote controller 6b outside the bathroom. Either one of the warning means 15a or 15b may be provided, and both of the warning means 15a and 15b may not be provided. in this case,
When the bathing time alarm means 15a is not provided, the bathing time judging section 10c outputs the bathing time excess signal S1, and when the bathing time alarming means 15b is not provided, the bathing time judging section 10d outputs the bathing time abnormal signal S2. Need not be provided in the digital signal processor 10. When at least one of the bathing time alarming means 15a and the bathing time alarming means 15b is provided, it may be provided on only one of the bathroom remote controller 6a and the bathroom remote controller 6b. However, it is preferably provided on the remote controller 6b outside the bathroom. Further, bathing time alarm means 15a and bathing time alarm means 15b
May not be provided in the bathroom remote controller 6a and the bathroom remote controller 6b, respectively, but may be installed separately in the bathroom or outside the bathroom.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of a bathing detection device according to the present invention.

FIG. 2 is a block diagram showing a system configuration of a bathing detection device according to the present invention.

FIG. 3 is an explanatory diagram showing a display example of a bathing display and a bathing time display output to a display output unit of a bathing detection device according to the present invention.

FIG. 4 is an explanatory view showing an embodiment of an electrode of the bathing detection device according to the present invention.

FIG. 5 is an explanatory view showing another embodiment of the electrode of the bathing detection device according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 bathing detection device 2 bathtub 2a bottom surface 2b backrest surface 2c foot inner wall surface 2d left and right inner wall side surfaces 3 electrode 3a lead wire 4 signal processing unit 5 display output unit 6 remote control device 6a remote controller in bathroom 6b remote controller outside bathroom 6c power line 7 amplification Unit 8 Noise removal unit 9 A / D conversion unit 10 Digital signal processing unit 10a Bath detection unit 10b Bath time measurement unit 10c Bath time determination unit 10d Bath time determination unit 11 Microcomputer 12 Clock unit 13 Timer unit 14 Hot water temperature measurement unit 15 Alarming means 15a Bathing time alarming means 15b Bathing time alarming means 16 Bubble port 17 Drainage port 18 Water jet port 19 Hot water supply port 19a Bath adapter 20 Metal handrail 21 Electrode 22 Housing 23 Amplifying means 24 Transmission means 25 Power supply 26 Receiving means D1 Bathing display D2 Bathing time display S1 Bath time exceeded signal S2 bathing time abnormality signal

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Hikaru Ozaki 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi, Osaka Inside Osaka Gas Co., Ltd. (72) Satoshi Fujita 4-chome, Hirano-cho, Chuo-ku, Osaka-shi, Osaka No. 1-2 in Osaka Gas Co., Ltd.

Claims (5)

[Claims] At least one pair of electrodes installed or capable of being installed at a position capable of contacting hot and cold water in a bath tub, and when an electrocardiographic signal is detected by processing an electric signal guided to the electrode, A bath detection device comprising: a signal processing unit that determines that there is a bather in the bathtub. 2. When the signal processing unit detects a bather in the bathtub, a bathing display indicating the presence of the bather or a bathing time display indicating the bathing duration and a bathing duration based on the detection result are displayed. The bathing detection device according to claim 1, further comprising a display output unit for outputting. 3. A bathing time alarm means for generating a predetermined alarm when the signal processing unit detects a bather in the bathtub and when the bathing duration exceeds a predetermined appropriate bathing time. The bathing detection device according to claim 1 or 2, further comprising: 4. The bath detection according to claim 3, further comprising a hot water temperature measuring means for measuring a hot water temperature in the bathtub, wherein the appropriate bathing time is a value corresponding to the hot water temperature measured by the hot water temperature measuring means. apparatus. 5. A bathing time alarm means for issuing a predetermined alarm when the signal processing unit detects a bather in the bathtub and when the bathing start time is outside a predetermined time zone. The bathing detector according to claim 1, 2, 3, or 4.