JP7766867B2 - Bathtub equipment - Google Patents

Description

The present invention relates to a bathtub device, and in particular to a bathtub device that can provide bathers with warm and cool sensations.

JP 2020-106964 A (Patent Document 1) describes a bathing system. In this bathing system, a control means determines a target temperature for the bather's core body temperature based on the current time or the time before bedtime between the planned bathing time and the planned bedtime. If the time before bedtime is short, the target temperature is set lower than if the time before bedtime is long. The temperature of the water in the bathtub is then adjusted so that this target temperature is achieved. The control means also issues a warning to encourage the bather to exit the bath when their core body temperature has risen by the target temperature through bathing. This encourages the bather to sleep soundly, improving and preventing sleep disorders, even if the time until the bather's planned bedtime is short compared to the available bathing time.

Japanese Patent Application Laid-Open Publication No. 2015-25581 (Patent Document 2) also describes a bath device. In this bath device, the temperature of the water in the bathtub is set to an initial temperature that is lower than the bather's core body temperature immediately before bathing, but higher than the body surface temperature of each part of the bather's body immediately before bathing. Furthermore, this bath device is configured so that after the bather has bathed in water at the initial temperature for a predetermined bathing time or longer, the temperature of the water in the bathtub is raised to the final temperature while the bather is still bathing, allowing the bather to end the bathing experience. This induces drowsiness in the bather, allowing them to sleep soundly.

Japanese Patent Application Laid-Open No. 2020-106964 JP 2015-25581 A

However, the inventions described in Patent Documents 1 and 2 attempt to adjust the bather's core body temperature to a temperature suitable for falling asleep by controlling the temperature of the water in the bathtub, which means that it takes time to change the body temperature, making it difficult to set the bather's body temperature to the desired temperature in a short period of time. Furthermore, even if the bather's body temperature is set to a predetermined temperature when they exit the bath, in high temperatures such as in summer, it is difficult for the bather's core body temperature to drop to a temperature suitable for falling asleep when they exit the bath. On the other hand, in low temperatures such as in winter, it takes time to raise the bather's core body temperature to a temperature suitable for falling asleep when they exit the bath.

The present invention therefore aims to provide a bathtub device that makes it easy to set the bather's body temperature at an appropriate temperature when they go to bed, regardless of the ambient temperature, even for relatively short bathing periods.

In order to solve the above-mentioned problems, the present invention provides a bathtub device capable of providing a warming stimulus and a cooling stimulus to a bather, comprising: a bathtub body for storing hot and cold water; a hot and cold water temperature acquisition unit for acquiring the temperature of the hot and cold water stored in the bathtub body; a heating/cooling device for providing a warming stimulus higher than the hot and cold water temperature acquired by the hot and cold water temperature acquisition unit and a cooling stimulus lower than the hot and cold water temperature to specific parts of the bather's body; an environmental temperature acquisition unit for acquiring information about the air temperature; and a control unit for controlling the heating/cooling device based on the air temperature information acquired by the environmental temperature acquisition unit. The control unit controls the heating/cooling device to provide a warming stimulus to the bather when the air temperature acquired by the environmental temperature acquisition unit is lower than a first temperature, and controls the heating/cooling device to provide a cooling stimulus to the bather when the air temperature acquired by the environmental temperature acquisition unit is equal to or higher than a second temperature.

In the present invention configured in this manner, the hot and cold water temperature acquisition unit acquires the temperature of the hot and cold water stored in the bathtub body, and the heating and cooling device provides a warming stimulus higher than the hot and cold water temperature and a cooling stimulus lower than the hot and cold water temperature to specific parts of the bather's body. The control unit controls the heating and cooling device based on information about the air temperature acquired by the environmental temperature acquisition unit. The control unit provides a warming stimulus to the bather when the air temperature is lower than a first temperature, and a cooling stimulus to the bather when the air temperature is equal to or higher than a second temperature.

If a bather raises their core body temperature by bathing, then exits the bath, and goes to bed when their core body temperature has dropped by a predetermined amount since exiting the bath, they will be able to fall asleep more easily and get a comfortable sleep. However, according to research by the present inventors, when the temperature is high, such as in summer, the bather's core body temperature does not drop easily after exiting the bath, and even when it is time to go to bed, their core body temperature may not drop sufficiently, making it difficult for them to fall asleep. On the other hand, when the temperature is low, such as in winter, the bather's core body temperature drops immediately after exiting the bath, and they may feel cold when going to bed, making it difficult for them to fall asleep.

According to the present invention configured as described above, when the air temperature is lower than the first temperature, the bather is given a warming stimulus, preventing the bather's core body temperature from dropping too low by the time they go to bed, allowing them to fall asleep comfortably. On the other hand, when the air temperature is higher than the second temperature, the bather is given a cooling stimulus, making it easier for the bather's core body temperature to drop even after they leave the bath, allowing the body temperature to drop sufficiently by the time they go to bed, allowing them to fall asleep comfortably. Furthermore, according to the present invention configured as described above, the heating and cooling device applies warming and cooling stimuli to specific parts of the bather's body, allowing the bather's core body temperature to be changed more quickly and efficiently than when the temperature of the hot or cold water in the bathtub body is changed to impart a warming or cooling stimulus to the bather's entire body. Therefore, even with a relatively short bath, the bather's body temperature at bedtime can be easily set to an appropriate temperature regardless of the ambient temperature.

In the present invention, the heating/cooling device is preferably positioned above the surface of the hot and cold water stored in the bathtub body, and provides warming and cooling stimuli to parts of the bather's body above the surface of the hot and cold water stored in the bathtub body.

With this configuration, the present invention uses a heating/cooling device to provide warming and cooling stimuli to areas of the bather's body above the surface of the hot and cold water stored in the bathtub body, allowing for warming and cooling stimuli to be provided directly to the bather's skin exposed to the hot and cold water in the bathtub body. This allows for warming and cooling stimuli to be provided more quickly than when the stimuli are provided via the hot and cold water in the bathtub body, thereby changing the bather's core body temperature.

In the present invention, the control unit preferably controls the heating/cooling device to start providing a cooling or warming stimulus to the bather a predetermined time after the bather enters the bathtub body.

Immediately after a bather enters the bathtub, there may be a large discrepancy between the bather's core body temperature and the temperature of the hot water in the bathtub. Applying a cooling or warming stimulus in this state may cause discomfort to the bather. According to the present invention configured as described above, the application of a cooling or warming stimulus to the bather begins after a predetermined time has elapsed, allowing the bather to enjoy bathing. Furthermore, after the predetermined time has elapsed, the bather's core body temperature will be approaching the temperature of the hot water in the bathtub, so the bather's core body temperature can be set to a temperature suitable for falling asleep without causing discomfort to the bather from the cooling or warming stimulus.

In the present invention, it is preferable that the device further includes a body temperature acquisition unit that acquires the amount of change in the bather's body temperature after the bather enters the bathtub body, and the predetermined time period varies depending on the amount of change in the bather's body temperature after the bather enters the bathtub body.

For example, if the bather's body temperature drops significantly when bathing, the bather's body temperature may not be sufficiently close to the temperature of the hot water in the bathtub body even after a predetermined time has passed. According to the present invention configured as described above, the predetermined time from when the bather enters the bathtub body until the application of the cooling or warming stimulus begins varies depending on the amount of change in the bather's body temperature. Therefore, by applying the cooling or warming stimulus when the bather's body temperature has risen sufficiently, it is possible to more effectively induce a body temperature change suitable for falling asleep.

In the present invention, preferably, the device further includes a heart rate acquisition unit that acquires the bather's heart rate, and the control unit estimates the amount of change in the bather's body temperature based on the bather's heart rate acquired by the heart rate acquisition unit.

With this configuration, the present invention estimates the amount of change in the bather's body temperature based on the bather's heart rate acquired by the heart rate acquisition unit, making it possible to acquire the amount of change in the bather's body temperature without placing a burden on the bather.

The present invention preferably further includes an elapsed time detection unit that detects the amount of time that has elapsed since the bather entered the bathtub body, and the control unit estimates the amount of change in the bather's body temperature based on the elapsed time detected by the elapsed time detection unit and the water temperature acquired by the water temperature acquisition unit.

With this configuration, the present invention estimates the amount of change in the bather's body temperature based on the elapsed time and the temperature of the hot and cold water, making it possible to obtain the amount of change in the bather's body temperature without forcing the bather to change their bathing position.

In the present invention, preferably, the device further includes an alarm unit, and the control unit applies a cooling or warming stimulus to the bather for a predetermined period of time, after which the alarm unit prompts the bather to exit the bath.

With this configuration, the present invention provides a cooling or warming stimulus to the bather for a predetermined period of time, and then the alarm unit prompts the bather to exit the bath. This allows the bather to exit the bath when their body temperature reaches a temperature suitable for falling asleep, more effectively helping the bather fall asleep.

The bathtub device of the present invention makes it easy to set the bather's body temperature to an appropriate temperature when they are sleeping, even if they are only bathing for a relatively short time.

1 is a perspective view showing an entire bathroom in which a bathtub apparatus according to an embodiment of the present invention is installed. A diagram showing a hot and cold water supply system to a water discharge device in a bathtub apparatus according to an embodiment of the present invention. 1 is a cross-sectional view showing the structure of an electrode provided in a bathtub apparatus according to an embodiment of the present invention. FIG. 2 is a block diagram of a control unit provided in a bathtub apparatus according to an embodiment of the present invention. 10 is a diagram showing an example of a bather's electrocardiogram waveform acquired by a heart rate acquisition unit in a bathtub apparatus according to an embodiment of the present invention. FIG. 10 is a graph showing an example of the relationship between the bather's heart rate and the bather's core body temperature. 4 is a flowchart showing the operation of a bathtub apparatus according to an embodiment of the present invention. 10 is a time chart showing an example of the action when a thermal stimulus is given by the bathtub apparatus according to the embodiment of the present invention. 10 is a time chart showing an example of the action when a cooling sensation is given by the bathtub apparatus according to the embodiment of the present invention. 10 is a graph showing an example of changes in core body temperature over time after a bather enters a bathtub body filled with hot water.

Next, a bathtub apparatus according to an embodiment of the present invention will be described with reference to the accompanying drawings.
Fig. 1 is a perspective view showing the entire bathroom in which a bathtub apparatus according to an embodiment of the present invention is installed. Fig. 2 is a diagram showing the hot and cold water supply system to the water discharge device in a bathtub apparatus according to an embodiment of the present invention. Fig. 3 is a cross-sectional view showing the structure of electrodes provided in a bathtub apparatus according to an embodiment of the present invention. Fig. 4 is a block diagram of a control unit provided in a bathtub apparatus according to an embodiment of the present invention.

As shown in FIG. 1, a bathtub apparatus 1 according to an embodiment of the present invention includes a bathtub main body 2 and a negative electrode 4a, a positive electrode 4b, and a reference electrode 4c attached to the bathtub main body 2. The bathtub apparatus 1 is installed in a bathroom R. The bathtub apparatus 1 also includes a water discharge device 8 attached to the upper edge of the bathtub main body 2, a circulation device 9 that discharges hot and cold water from the bathtub main body 2 through the water discharge device 8 and the bathtub water outlet 9a, and a control unit 6 that controls the circulation device 9. A remote control 6a is attached to the wall of the bathroom R, allowing the water discharge device 8 of the bathtub apparatus 1 to be operated using the remote control 6a. A temperature sensor 7 for detecting the air temperature is installed outside the bathroom R and is configured to transmit information about the detected temperature to the control unit 6. The temperature sensor 7 is configured to detect the air temperature (room temperature) of a room outside the bathroom R, but may also be configured to detect the outside air temperature. The remote control 6a also includes a speaker 6b (FIG. 4), which serves as an alarm unit, and is configured to convey various messages to the bather. In this embodiment, a speaker 6b is provided as the notification unit, but the notification unit can also be configured as a device that transmits information visually, such as the display screen of a remote control 6a. Furthermore, in this embodiment, the bathtub apparatus 1 is placed on one side of the bathroom R, in contact with the wall.

The bathtub apparatus 1 of this embodiment is configured so that when a bather activates the water discharge device 8, hot water that is either warmer or cooler than the hot water stored in the bathtub main body 2 is discharged from the water discharge device 8. Furthermore, in this embodiment, the bathtub apparatus 1 is configured to control the temperature of the hot water discharged from the water discharge device 8 based on information about the air temperature detected by the air temperature sensor 7, thereby providing the bather with a cooling or warming sensation.

The bathtub body 2 is shaped like a roughly rectangular box in a plan view and is configured to store hot and cold water inside. In this embodiment, the bathtub body 2 is positioned so that one long side and the entire two short sides on either side of it are in contact with the interior wall surface of the bathroom R. The interior wall surface that forms one short side of the bathtub body 2 is configured as a backrest surface 2a, which is the first interior wall surface against which the bather can lean. Furthermore, a drainage section (not shown) is provided on the bottom surface of the bathtub body 2 for draining hot and cold water from the bathtub body 2. An apron 2b is removably attached to the long side of the bathtub body 2 that is not in contact with the interior wall surface of the bathroom R.

The water discharge device 8 is located above the backrest surface 2a of the bathtub main body 2 and is configured to discharge hot water toward the inside of the bathtub main body 2. In this embodiment, the water discharge device 8 has a flat, wide water outlet 8a that extends along the upper edge of the backrest surface 2a, and is configured to discharge hot water toward specific parts of the bather's body leaning against the backrest surface 2a, namely the neck, shoulders, and back. In other words, the water discharge device 8 is positioned above the surface of the hot water stored in the bathtub main body 2, and the hot water discharged from the water discharge device 8 is directed at parts of the bather's body above the water surface, providing the bather with a warming and cooling sensation.

The water discharge device 8 is also configured to discharge a portion of the hot water drawn in from the bathtub water intake 9b by the circulation device 9 through the water outlet 8a. As a result, the hot water in the bathtub body 2 is sucked in by the circulation device 9, discharged from the water outlet 8a, and circulated so that it flows into the bathtub body 2. Furthermore, a portion of the hot water drawn in from the bathtub water intake 9b by the circulation device 9 is also discharged from the bathtub water outlet 9a provided on the backrest surface 2a of the bathtub body 2.

The negative electrode 4a and positive electrode 4b are a pair of electrodes attached to the bathtub body 2 to detect the bather's electrocardiogram signal via the hot and cold water stored in the bathtub body 2. The bather's electrocardiogram signal is obtained as a signal representing the potential difference between the negative electrode 4a and the positive electrode 4b. The pair of electrodes consisting of the negative electrode 4a and the positive electrode 4b are both positioned on the backrest surface 2a, which forms the short side of the bathtub body 2. The reference electrode 4c is an electrode used to obtain a reference potential for the potential detected by the negative electrode 4a and the positive electrode 4b, and this electrode is also positioned on the backrest surface 2a of the bathtub body 2.

The negative electrode 4a and positive electrode 4b are arranged symmetrically with respect to the horizontal (width) centerline of the backrest surface 2a. That is, the negative electrode 4a and positive electrode 4b are arranged on the backrest surface 2a at a distance from the centerline in the left-right direction. Furthermore, the negative electrode 4a and positive electrode 4b are arranged so as to be located below the water surface in the bathtub body 2. The negative electrode 4a and positive electrode 4b can be attached below the water surface in the bathtub body 2 and at a height higher than the reference electrode 4c. Meanwhile, the reference electrode 4c is arranged on the centerline of the backrest surface 2a, below the negative electrode 4a and positive electrode 4b. The reference electrode 4c is not necessarily provided and can be omitted.

Next, a hot and cold water supply system to the water discharge device 8 will be described with reference to FIG.
First, as shown in Figure 2, the circulation device 9 is configured to suck in hot water from within the bathtub body 2 through a bathtub water intake 9b provided on the inner wall surface of the bathtub body 2 and discharge the hot water from the water outlet 8a of the water discharge device 8 into the bathtub body 2. Furthermore, a portion of the hot water sucked in through the bathtub water intake 9b is discharged from the bathtub water outlet 9a provided on the backrest surface 2a of the bathtub body 2. Specifically, the circulation device 9 is configured with a pump that sucks in hot water from the bathtub water intake 9b and discharges it from the water outlet 8a and bathtub water outlet 9a.

On the other hand, hot water and cold water are also supplied to the water discharge device 8 from a high-temperature hot water supply pipe 40a, which supplies hot water at a higher temperature than the hot water stored in the bathtub main body 2, and a low-temperature hot water supply pipe 40b, which supplies water at a lower temperature than the hot water stored in the bathtub main body 2. That is, hot water drawn in from the bathtub water intake 9b and pressurized by the circulation device 9, hot water supplied from the high-temperature hot water supply pipe 40a, and water supplied from the low-temperature hot water supply pipe 40b are all guided to the mixing chamber 44, mixed there, and discharged from the water discharge port 8a of the water discharge device 8. It is also possible to merge and mix the hot water from the high-temperature hot water supply pipe 40a and the water from the low-temperature hot water supply pipe 40b within the pipeline without providing a special mixing chamber with a large volume.

The high-temperature hot water supply pipe 40a and the low-temperature hot water supply pipe 40b are connected to the mixing chamber 44 via the high-temperature linear valve 42a and the low-temperature linear valve 42b, respectively, allowing the amount of hot water or cold water flowing into the mixing chamber 44 to be controlled. Furthermore, in this embodiment, hot water at a higher temperature than the hot water stored in the bathtub body 2 is supplied from the water heater 52 to the high-temperature hot water supply pipe 40a. That is, tap water supplied from the main water supply 54 is branched at the branch point 54a, with one branch being supplied to the water heater 52 and the other flowing directly into the low-temperature hot water supply pipe 40b. The tap water supplied to the water heater 52 is heated to a temperature higher than the hot water stored in the bathtub body 2 and supplied to the high-temperature hot water supply pipe 40a.

As a result, when hot water at a temperature higher than the temperature of the water stored in the bathtub main body 2 is discharged, the high-temperature side linear valve 42a is opened, and the hot water drawn in from the bathtub main body 2 and the hot water supplied from the high-temperature hot water supply pipe 40a are mixed in the mixing chamber 44 and discharged from the water discharge device 8. On the other hand, when hot water at a temperature lower than the temperature of the water stored in the bathtub main body 2 is discharged, the low-temperature side linear valve 42b is opened, and the hot water drawn in from the bathtub main body 2 and the tap water supplied from the low-temperature hot water supply pipe 40b are mixed in the mixing chamber 44 and discharged from the water discharge device 8. Therefore, in this embodiment, the high-temperature side linear valve 42a, the low-temperature side linear valve 42b, the circulation device 9, and the water discharge device 8 function as a heating/cooling device that provides warming and cooling stimuli to specific parts of the bather's body.

Furthermore, the temperature of the hot water stored in the bathtub main body 2 is detected by a bathtub temperature sensor 46 attached to the bathtub main body 2. The temperature of the hot water to be discharged from the water discharge device 8 is detected by a discharge water temperature sensor 48 attached to the water discharge device 8. Furthermore, the temperature of the hot water flowing in from the high-temperature hot water supply pipe 40a is detected by a high-temperature side temperature sensor 50a, and the temperature of the water flowing in from the low-temperature hot water supply pipe is detected by a low-temperature side temperature sensor 50b. Furthermore, some of the sensors that detect the temperature of each hot water and water can be omitted by estimating the temperature based on data obtained from other sensors.

The temperatures detected by these temperature sensors are sent to the control unit 6, which controls the opening of the high-temperature side linear valve 42a and the low-temperature side linear valve 42b based on these detected temperatures, causing hot water at the required temperature to be discharged from the water discharge device 8. In other words, the control unit 6 controls the opening of the high-temperature side linear valve 42a and the low-temperature side linear valve 42b so that the temperature detected by the discharge water temperature sensor 48 becomes the required temperature. Details of the control by the control unit 6 will be described later.

Next, the structure of each electrode attached to the bathtub body 2 will be described with reference to FIG.
Although the structure of the negative electrode 4a will be described here, in this embodiment, the negative electrode 4a, the positive electrode 4b, and the reference electrode 4c all have the same structure.

As shown in Figure 3, the negative electrode 4a has an electrode portion 10, a front gasket 12a, a rear gasket 12b, a flange 14, a moisture-proof tube 16, a connection terminal 18, a fixing screw 20, a conductor 22, and a sheath 24. The negative electrode 4a is attached so that it is exposed on the surface of the backrest surface 2a of the bathtub body 2, and the gasket ensures watertightness between the negative electrode 4a and the backrest surface 2a.

The electrode unit 10 is a conductive metal component consisting of a disk-shaped disc portion 10a and a shaft portion 10b that protrudes perpendicularly from the back of the disc portion 10a. The disc portion 10a is a thin, circular portion, the front of which is exposed on the surface of the backrest surface 2a and is configured to detect electrical potential. In this embodiment, the disc portion 10a is approximately 15 mm in diameter and 2.5 mm thick, and is entirely positioned on the surface of the backrest surface 2a. The shaft portion 10b is a round bar-shaped portion that extends perpendicularly from the center of the back of the disc portion 10a and protrudes through a through-hole formed in the backrest surface 2a to the underside of the backrest surface 2a. A male thread is formed in the middle of the shaft portion 10b, and a fixing portion for fixing the connection terminal 18 is formed at the tip.

The front gasket 12a is a disc-shaped rubber member with a circular hole in the center for passing the shaft portion 10b of the electrode portion 10 through. The front gasket 12a has approximately the same diameter as the disc portion 10a of the electrode portion 10 and is positioned on the back side of the disc portion 10a. When the negative electrode 4a is attached to the backrest surface 2a, the front gasket 12a is sandwiched between the back of the disc portion 10a and the surface of the backrest surface 2a, ensuring watertightness between the backrest surface 2a and the negative electrode 4a.

The back gasket 12b is a disc-shaped member made of rubber, with a circular hole in the center for passing the shaft portion 10b of the electrode portion 10 through. The back gasket 12b is larger than the front gasket 12a and has a diameter roughly the same as the large diameter portion of the flange 14, and is positioned on the back side of the backrest surface 2a. When the negative electrode 4a is attached to the backrest surface 2a, the back gasket 12b is sandwiched between the back surface of the backrest surface 2a and the end face of the flange 14, ensuring watertightness between the rear surface of the backrest surface 2a and the negative electrode 4a. The front gasket 12a and back gasket 12b may also be made of resin.

The flange 14 is a stepped cylindrical member consisting of a large-diameter section and a small-diameter section, and has a female thread formed in its center for passing through the shaft 10b of the electrode section 10. The large-diameter section of the flange 14 is formed to have approximately the same diameter as the back gasket 12b, and the small-diameter section is formed on the back side of the large-diameter section. By threading and tightening the female thread formed to pass through the flange 14 and the male thread formed on the shaft 10b of the electrode section 10, the end face of the large-diameter section of the flange 14 presses the back gasket 12b against the back of the backrest surface 2a, ensuring watertightness.

The moisture-proof tube 16 is a long, thin tube made of rubber, and is arranged to cover the tip of the shaft portion 10b of the electrode portion 10, the connection terminal 18, the lead wire 22, etc. The small diameter portion of the flange 14 is fitted into the tip of the moisture-proof tube 16, preventing moisture from entering the moisture-proof tube 16. The moisture-proof tube 16 may also be made of resin.

The connection terminal 18 is a component made of conductive metal and is crimped and connected to the tip of the conductor 22. A hole is provided at the tip of the connection terminal 18 for passing a fixing screw 20 through. The fixing screw 20 can be passed through this hole and threaded into a female thread provided at the tip of the shaft portion 10b of the electrode portion 10, thereby fixing the connection terminal 18 to the electrode portion 10. This allows the electrode portion 10 and the conductor 22 to be electrically connected in a detachable manner.

The conductor 22 is a conductive wire for electrically connecting the electrode unit 10 and the control unit 6 (Figure 1), and extends from the negative electrode 4a to the control unit 6. The conductor 22 is also covered with a sheath 24 made of an insulating material, ensuring the electrical insulation of the conductor 22. In this embodiment, the conductors 22 extending from the negative electrode 4a, positive electrode 4b, and reference electrode 4c are connected to the control unit 6, and electrocardiographic signals are input to the control unit 6.

Next, the configuration of the control unit 6 provided in the bathtub apparatus 1 according to the embodiment of the present invention will be described with reference to FIG.
4, the control unit 6 includes an environmental temperature acquisition unit 56 that acquires information related to the air temperature, a heart rate acquisition unit 57 that acquires the bather's heart rate, a body temperature acquisition unit 58 that acquires the amount of change in the bather's body temperature, an elapsed time detection unit 60 that detects the time elapsed since entering the bathtub, a hot and cold water temperature acquisition unit 62 that acquires the temperature of the hot and cold water in the bathtub body 2, and a control unit 64 that controls the heating and cooling device. Specifically, the control unit 6 is composed of a microprocessor, memory, an interface circuit, and software that operates these (all not shown), and realizes the functions of the above-mentioned units.

As shown in FIG. 4, the negative electrode 4a, positive electrode 4b, and reference electrode 4c are connected to the control unit 6, and the potential information obtained by these electrodes is input to the control unit 6. The control unit 6 is also connected to a bathtub temperature sensor 46, a discharge water temperature sensor 48, a high-temperature side temperature sensor 50a, and a low-temperature side temperature sensor 50b, and the detection signals from these sensors are input to the control unit 6. Furthermore, information on the air temperature detected by the air temperature sensor 7 is transmitted to the control unit 6. The control unit 6 is also connected to a circulation device 9, a high-temperature side linear valve 42a, a low-temperature side linear valve 42b, and a speaker 6b, and these are operated by control signals from the control unit 6.

The environmental temperature acquisition unit 56 is configured to acquire temperature information detected by the temperature sensor 7 and transmitted to the control unit 6. In this embodiment, the bathtub apparatus 1 is equipped with a temperature sensor 7, and the temperature information detected by the temperature sensor 7 is acquired by the environmental temperature acquisition unit 56. However, the bathtub apparatus 1 does not necessarily have to be equipped with a temperature sensor 7. In other words, the environmental temperature acquisition unit 56 can also be configured to acquire temperature information from an external information source via the Internet, etc. For example, temperature information for the area where the bathtub apparatus 1 is installed can be acquired from weather information and weather forecasts provided on the Internet.

The heart rate acquisition unit 57 is configured to detect the bather's electrocardiogram signal based on the potential signals acquired by the negative electrode 4a, positive electrode 4b, and reference electrode 4c, and to acquire the bather's heart rate from the electrocardiogram signal. The bather's electrocardiogram signal in the bathtub main body 2 can be detected as a signal of the potential difference between each electrode via the hot water and water in the bathtub main body 2.

Figure 5 shows an example of a bather's electrocardiogram waveform acquired by the heart rate acquisition unit 57. The electrocardiogram signal is acquired by the heart rate acquisition unit 57 as a signal of the potential difference between the negative electrode 4a and the positive electrode 4b, and the electrocardiogram waveform shown in Figure 5 is a time-series waveform representation of this signal. As shown in Figure 5, impulse-like R waves with large amplitude appear periodically in the electrocardiogram waveform, and the bather's heart rate (bpm) can be obtained by counting the number of R waves per unit time.

Next, the body temperature acquisition unit 58 is configured to acquire the body temperature of the bather in the bathtub main body 2. In this embodiment, the body temperature acquisition unit 58 is configured to estimate the bather's deep body temperature as the body temperature based on the bather's heart rate acquired by the heart rate acquisition unit 57. Here, deep body temperature refers to the temperature inside the bather's body, and typically, sublingual temperature, rectal temperature, tympanic temperature, etc. are measured as deep body temperature. Figure 6 is a graph showing an example of the relationship between the bather's heart rate and deep body temperature. In this embodiment, the body temperature acquisition unit 58 estimates the amount of change in the bather's deep body temperature based on the relationship between heart rate and deep body temperature, as shown in Figure 6. In other words, when the bather immerses in the hot water in the bathtub main body 2, the body warms up and the heart rate gradually increases. Therefore, by detecting the bather's heart rate, the amount of change in the bather's deep body temperature (body temperature) can be estimated.

In this embodiment, the body temperature acquisition unit 58 estimates changes in the bather's core body temperature based on changes in the bather's heart rate, but the present invention can also be configured to measure the bather's body temperature directly. For example, the bather's body temperature can be detected by capturing an image of the bather using a thermograph (not shown). Furthermore, the body temperature detected by the thermograph is the bather's body surface temperature, but since a specific relationship is known between body surface temperature and core body temperature, the core body temperature can be estimated from the detected body surface temperature. Alternatively, the present invention can be configured to measure the bather's body temperature by having the bather wear a thermometer while bathing.

Next, the elapsed time detection unit 60 is configured to detect the time that has passed since the bather was immersed in the hot water in the bathtub main body 2. Specifically, when the bather enters the bathtub main body 2, the heart rate acquisition unit 57 begins to acquire the bather's electrocardiogram signal. When the heart rate acquisition unit 57 begins to acquire the electrocardiogram signal, the elapsed time detection unit 60 determines that the bather has entered the bathtub main body 2, and a timer (not shown) built into the control unit 6 calculates the elapsed time from this point. Note that the present invention can also be configured so that an optional sensor that can detect when the bather has entered the bathtub main body 2 is provided, and this sensor detects the bather's entry and measures the elapsed time since detection.

The hot water temperature acquisition unit 62 is configured to acquire the temperature of each part based on the detection signals input from the bathtub temperature sensor 46, the discharged water temperature sensor 48, the high-temperature side temperature sensor 50a, and the low-temperature side temperature sensor 50b. That is, the hot water temperature acquisition unit 62 acquires the temperature of the hot water stored in the bathtub main body 2 based on the detection signal input from the bathtub temperature sensor 46. In addition, in this embodiment, the temperature of the hot water in the bathtub main body 2 acquired by the hot water temperature acquisition unit 62 is used as a reference temperature, and hot water with a temperature higher than the reference temperature is discharged from the water discharge device 8 as a warming stimulus, and hot water with a temperature lower than the reference temperature is discharged from the water discharge device 8 as a cooling stimulus.

Furthermore, the hot water temperature acquisition unit 62 acquires the temperature of the hot water supplied from the high-temperature hot water supply pipe 40a based on the detection signal input from the high-temperature side temperature sensor 50a, and acquires the temperature of the water supplied from the low-temperature hot water supply pipe 40b based on the detection signal input from the low-temperature side temperature sensor 50b. The hot water temperature acquisition unit 62 also acquires the temperature of the hot water discharged from the water discharge device 8 based on the detection signal input from the discharge water temperature sensor 48. The present invention can also be configured so that this hot water temperature is acquired by the hot water temperature acquisition unit 62 as the temperature of the hot water in the bathtub main body 2. In this embodiment, temperature sensors are provided to acquire the temperatures of each component. However, the present invention can also be configured so that at least some of these temperature sensors are omitted, and the hot water temperature acquisition unit 62 acquires the estimated temperature as the temperature of the hot water in the bathtub main body 2. For example, if the temperature of the hot water in the bathtub main body 2 is maintained at a certain set temperature by a temperature control device (not shown), the present invention can also be configured so that this set temperature is acquired by the hot water temperature acquisition unit 62 as the temperature of the hot water in the bathtub main body 2.

The control unit 64 is configured to provide a warming or cooling sensation to the bather based on the temperature information acquired by the environmental temperature acquisition unit 56. When providing a warming sensation to the bather, the control unit 64 operates the circulation device 9 to discharge hot water taken in from the bathtub main body 2 through the bathtub water intake 9b from the water outlet 8a of the water discharger 8. At the same time, the high-temperature side linear valve 42a is opened to mix high-temperature water with the hot water discharged from the water outlet 8a. As a result, hot water with a higher temperature than the reference temperature of the hot water in the bathtub main body 2 is discharged from the water outlet 8a of the water discharger 8, providing a warming sensation to the bather. On the other hand, when providing a cooling sensation to the bather, the hot water in the bathtub main body 2 is discharged from the water outlet 8a of the water discharger 8, and the low-temperature side linear valve 42b is opened to mix low-temperature water with the hot water discharged from the water outlet 8a. As a result, hot water at a temperature lower than the reference temperature of the hot water in the bathtub body 2 is discharged from the water discharge port 8a of the water discharge device 8, providing a cooling sensation to the bather.

For this reason, in this embodiment, the water discharge device 8, circulation device 9, high-temperature side linear valve 42a, and low-temperature side linear valve 42b function as a heating/cooling device that provides the bather with a warming stimulus higher than a predetermined reference temperature and a cooling stimulus lower than a predetermined reference temperature. The control unit 64 also controls the heating/cooling device based on the air temperature information acquired by the environmental temperature acquisition unit 56. Details of the control by the control unit 64 will be described later.

Next, the operation of the bathtub apparatus 1 according to the embodiment of the present invention will be described with reference to FIGS.
Fig. 7 is a flowchart showing the operation of the bathtub apparatus 1 of this embodiment. Fig. 8 is a time chart showing an example of the operation when a warming stimulus is applied by the bathtub apparatus 1 of this embodiment. Fig. 9 is a time chart showing an example of the operation when a cooling stimulus is applied by the bathtub apparatus 1 of this embodiment. The flowchart shown in Fig. 7 begins to be executed when the bather enters the bathtub main body 2, that is, when the bather's electrocardiogram signal begins to be detected by the heart rate acquisition unit 57 built into the control unit 6.

First, in step S1 of FIG. 7, the ambient temperature information detected by the air temperature sensor 7 and transmitted to the control unit 6 is acquired by the ambient temperature acquisition unit 56. Also in step S1, the temperature of the hot and cold water stored in the bathtub body 2, detected by the bathtub temperature sensor 46, is acquired by the hot and cold water temperature acquisition unit 62 of the control unit 6. In this embodiment, the air temperature and hot and cold water temperatures are acquired when the bather enters the bathtub body 2, but as a variant, the present invention can also be configured so that either or both of these temperatures are acquired when the bather enters the bathroom R. In this case, an entry sensor (not shown) is provided in the bathroom R to detect when the bather enters the bathroom R.

Next, in step S2, the bather's deep body temperature is acquired as body temperature by the body temperature acquisition unit 58 based on the bather's heart rate acquired by the heart rate acquisition unit 57. That is, the bather's electrocardiogram signal is detected by the negative electrode 4a and the positive electrode 4b, and the bather's heart rate is acquired by the heart rate acquisition unit 57 based on this. Furthermore, the body temperature acquisition unit 58 acquires the amount of change in body temperature (core body temperature) after the bather enters the bathtub main body 2 based on the bather's heart rate. Generally, the bather's body temperature (core body temperature) rises after entering the bathtub main body 2, and their heart rate also increases.

Furthermore, in step S3, it is determined whether the change in the bather's body temperature after entering the bathtub body 2 has reached or exceeded a predetermined value T3. If the change in body temperature is equal to or greater than the predetermined value T3, the process proceeds to step S4; if the change in body temperature is less than the predetermined value T3, the process returns to step S2. Therefore, in the flowchart shown in Figure 7, steps S3 → S2 → S3 are repeatedly executed until the change in the bather's body temperature reaches or exceeds the predetermined value T3. In this embodiment, the predetermined value T3 is set to 0.5°C.

FIG. 8 is a time chart showing an example of the operation of the bathtub apparatus 1, illustrating an example in which a thermal sensation stimulus is given to the bather.
In the example shown in Figure 8, at time _t0, the bather begins to immerse himself in the hot water in the bathtub main body 2. At this point, hot water is not being discharged from the water discharger 8. Then, when the bather operates the remote control 6a or when a predetermined waiting time _tw has passed from time _t0 , the water discharger 8 begins to discharge hot water. In the example shown in Figure 8, at time _t1 , the predetermined waiting time _tw has passed and the discharge of hot water has begun. In this embodiment, the predetermined waiting time _tw is set to approximately 5 minutes.

At time _t1 , the control unit 64 of the control unit 6 sends a control signal to the circulation device 9 to activate it and discharge hot water from the water discharger 8. Note that in this state, the high-temperature linear valve 42a and the low-temperature linear valve 42b remain closed. Therefore, the hot water in the bathtub body 2 drawn in from the bathtub water intake 9b (Figure 2) is discharged directly from the water discharge port 8a of the water discharger 8 and applied to the bather's neck and shoulders. Thus, in this embodiment, once a predetermined waiting time _tW has elapsed after the bather begins bathing, the water discharger 8 begins discharging hot water at the same temperature as the water in the bathtub body 2. Alternatively, as a variant, the present invention can be configured so that the discharge of hot water begins immediately after the bather begins bathing.

Furthermore, at time _t2 in Fig. 8, when the change in the bather's body temperature exceeds a predetermined value T3, the process proceeds to step S4 in the flowchart shown in Fig. 7. In step S4, it is determined whether the air temperature acquired by the environmental temperature acquisition unit 56 in step S1 is lower than a first temperature T1. If it is lower than the first temperature T1, the process proceeds to step S5. If it is equal to or higher than the first temperature T1, the process proceeds to step S6. In this embodiment, the first temperature T1 is set to 20°C.

Next, in step S5, the application of thermal stimulation begins. In the example shown in FIG. 8 , at time _t2 , the change in the bather's body temperature exceeds a predetermined value T3, and the air temperature acquired by the environmental temperature acquisition unit 56 is lower than the first temperature T1. Therefore, the application of thermal stimulation begins at time _t2 . That is, the control unit 64 of the control unit 6 sends a control signal to the high-temperature side linear valve 42a, opening it by a predetermined amount. As a result, the hot water in the bathtub body 2, which is drawn in from the bathtub water intake 9b (FIG. 2) and discharged from the water outlet 8a of the water discharge device 8, is mixed with the high-temperature hot water supplied from the high-temperature hot water supply pipe 40a, raising the temperature of the hot water discharged from the water outlet 8a. As a result, the high-temperature hot water is applied to the bather's neck and shoulders, providing a thermal stimulation to the bather. In this embodiment, the control unit 64 controls the opening degree of the high-temperature side linear valve 42a so that hot water that is approximately 4°C higher than the temperature of the hot water in the bathtub main body 2 is discharged from the water outlet 8a of the water discharge device 8.

Thus, in this embodiment, the application of thermal stimuli does not begin immediately after the bather enters the bath, but rather begins after a predetermined time has elapsed. Specifically, the application of thermal stimuli, etc., begins after the bather's body temperature change reaches or exceeds a predetermined value T3. Alternatively, as a variant, the present invention can be configured so that the application of thermal stimuli, etc., begins after a predetermined warming time t _h has elapsed after the bather is immersed in the hot water in the bathtub body 2. This predetermined warming time t _h can be set to, for example, approximately 5 minutes. This warming time t _h is approximately the same as the time required for the bather's core body temperature to rise by a predetermined value T3 (0.5°C) after entering the bathtub body 2. Furthermore, it is preferable to start the application of thermal stimuli, etc., after the latter half of the bather's time in the bathtub body 2.

Furthermore, after the application of the warming stimulus is started in step S5, step S8 is executed, and in step S8, it is determined whether or not a predetermined stimulation time _ts has elapsed after the start of the warming stimulus or the cooling stimulus. If the stimulation time _ts has elapsed, the process proceeds to step S9, and if the stimulation time _ts has not elapsed, the process of step S8 is repeatedly executed. In this embodiment, the predetermined stimulation time _ts is set to about 2 minutes.

In the example shown in Figure 8, after the start of the thermal stimulation at time _t2 , the stimulation time _ts has elapsed at time _t3 . When the stimulation time _ts has elapsed, the control unit 64 of the control unit 6 sends a control signal to the high-temperature side linear valve 42a to close it, and also sends a control signal to the circulation device 9 to stop it. This stops the discharge of hot water from the water discharge port 8a of the water discharge device 8.

Next, step S9 is executed in the flowchart shown in Figure 7. In step S9, the control unit 64 of the control unit 6 sends a signal to the speaker 6b (Figure 4) to output an audio message encouraging the bather to exit the bath, thereby completing one iteration of the flowchart shown in Figure 7. In other words, by applying the thermal stimulation for the predetermined stimulation time _tS , the bather's core body temperature is sufficiently raised, and even if the air temperature is lower than the first temperature T1, the bather's body temperature is less likely to drop after exiting the bath. By encouraging the bather to exit the bath in this state, an excessive drop in body temperature at bedtime can be prevented, allowing the bather to fall asleep comfortably after exiting the bath.

In this embodiment, a message prompting the bather to exit the bath is issued immediately after the thermal stimulus is applied for a predetermined stimulation time _tS . Alternatively, as a variation, the present invention can be configured so that the message prompting the bather to exit the bath is issued a predetermined time after the water discharge device 8 has stopped discharging hot and cold water and the application of the thermal stimulus has ended. For example, the present invention can be configured so that the message prompting the bather to exit the bath is issued one minute after the application of the thermal stimulus has ended. When the application of the thermal stimulus has ended, the bather's body temperature is at an optimal level for falling asleep after exiting the bath, so it is desirable for the bather to exit the bath early while maintaining that state.

On the other hand, in step S4 of FIG. 7, if the air temperature is equal to or higher than the first temperature T1, the process proceeds to step S6. In step S6, it is determined whether the air temperature acquired by the environmental temperature acquisition unit 56 in step S1 is equal to or higher than the second temperature T2. If it is equal to or higher than the second temperature T2, the process proceeds to step S7. If it is lower than the second temperature T2, the process proceeds to step S8. In this embodiment, the second temperature T2 is set to 25°C, which is higher than the first temperature T1.

FIG. 9 illustrates a case in which a cooling sensation is provided by the bathtub apparatus 1. In the example of the time chart shown in FIG. 9, the bather begins bathing at time _t10 , hot and cold water is discharged from the water discharger 8 at time _t11 , and the change in the bather's body temperature reaches or exceeds a predetermined value T3 at time _t12 , causing the processing of step S4 and subsequent steps in the flowchart shown in FIG. 7 to be executed. In the example shown in FIG. 9, the air temperature acquired by the environmental temperature acquisition unit 56 is equal to or higher than the second temperature T2, so the processing in the flowchart proceeds from step S6 to step S7. Thus, in this embodiment, the cooling sensation is not provided immediately after the bather begins bathing, but is provided after a predetermined time has elapsed. Specifically, after the change in the bather's body temperature reaches or exceeds the predetermined value T3, a warming sensation is provided if the air temperature is lower than the first temperature T1, and a cooling sensation is provided if the air temperature is equal to or higher than the second temperature T2. Furthermore, when the air temperature is between the first temperature T1 and the second temperature T2, the circulation of hot water within the bathtub body 2 continues after the discharge of hot water from the water discharge device 8 begins without providing any warming or cooling stimulation.
When the air temperature is between the first temperature T1 and the second temperature T2, the discharge from the water discharger 8 may be stopped.

Next, in step S7, the application of a cooling stimulus begins. In the example shown in FIG. 9, the application of a cooling stimulus begins at time _t12 . That is, the control unit 64 of the control unit 6 sends a control signal to the low-temperature linear valve 42b, opening it by a predetermined amount. As a result, the hot water in the bathtub body 2, which is drawn in from the bathtub water intake 9b (FIG. 2) and discharged from the water outlet 8a of the water discharger 8, is mixed with the low-temperature water supplied from the low-temperature hot water supply pipe 40b, lowering the temperature of the hot water discharged from the water outlet 8a. This allows the low-temperature hot water to be applied to the bather's neck and shoulders, providing a cooling stimulus to the bather. In this embodiment, the control unit 64 controls the opening of the low-temperature linear valve 42b so that hot water approximately 4°C lower in temperature than the hot water in the bathtub body 2 is discharged from the water outlet 8a of the water discharger 8.

Furthermore, after the application of the cooling stimulus is initiated in step S7, step S8 is repeatedly executed, and the cooling stimulus is applied for a predetermined stimulation time _tS . In the example shown in FIG. 9, after the start of the cooling stimulus at time _t12 , the stimulation time _tS has elapsed at time _t13 . When the stimulation time _tS has elapsed, the discharge of hot water from the water discharger 8 is stopped, and step S9 is executed. In step S9, a voice message urging the bather to exit the bath is output, completing one processing cycle of the flowchart shown in FIG. 7. That is, after the start of the cooling stimulus and the predetermined stimulation time _tS has elapsed, the bather's body surface is cooled, and the bather's core body temperature is likely to decrease after exiting the bath, even if the air temperature is equal to or higher than the second temperature T2. This prevents the bather's body temperature from remaining excessively elevated even when going to bed, allowing the bather to fall asleep comfortably.

According to the bathtub apparatus 1 of this embodiment, when the air temperature is lower than the first temperature T1, the bather is given a warming stimulus (steps S4 to S5 in Figure 7), preventing the bather's core body temperature from dropping too low by bedtime and allowing the bather to fall asleep comfortably. On the other hand, when the air temperature is equal to or higher than the second temperature T2, the bather is given a cooling stimulus (steps S6 to S7 in Figure 7), allowing the bather's core body temperature to drop easily even after leaving the bath, allowing the bather's body temperature to drop sufficiently by bedtime and allowing the bather to fall asleep comfortably. Furthermore, according to the bathtub apparatus 1 of this embodiment, the discharge of hot and cold water from the water discharge device 8 delivers warming and cooling stimuli to specific parts of the bather's body, such as the shoulders and neck. This allows the bather's core body temperature to be changed more quickly and efficiently than when the temperature of the hot and cold water in the bathtub body 2 is changed to deliver a warming or cooling stimulus to the bather's entire body. Therefore, even with a relatively short bath, the bather's body temperature at bedtime can be easily set to an appropriate temperature.

In addition, with the bathtub apparatus 1 of this embodiment, the discharge of hot and cold water from the water discharge device 8 provides warming and cooling stimuli to parts of the bather's body above the surface of the hot and cold water stored in the bathtub main body 2 (such as the shoulders and neck), thereby providing warming and cooling stimuli directly to the bather's skin exposed to the hot and cold water in the bathtub main body 2. This allows for the warming and cooling stimuli to be provided more quickly than when the stimuli are provided via the hot and cold water in the bathtub main body 2, thereby changing the bather's core body temperature.

Furthermore, with the bathtub apparatus 1 of this embodiment, after a predetermined time has elapsed (time _t2 in FIG. 8, time _t12 in FIG. 9), the bather begins to receive a cooling or warming stimulus, allowing the bather to enjoy a bathing experience. After the predetermined time has elapsed, the bather's core body temperature approaches the temperature of the hot water in the bathtub body, allowing the bather's core body temperature to be set to a temperature suitable for falling asleep without causing discomfort to the bather due to the cooling or warming stimulus.

Furthermore, according to the bathtub device 1 of this embodiment, the predetermined time (times _t0 to _t2 in Figure 8, times _t10 to _t12 in Figure 9) after the bather enters the bathtub body until the start of the application of cooling or warming stimuli changes depending on the amount of change in the bather's body temperature (depending on the time it takes for steps S2 → S3 → S2 in Figure 7 to be repeated). Therefore, by applying cooling or warming stimuli when the bather's body temperature has risen sufficiently, it is possible to more effectively lead to body temperature changes that are suitable for falling asleep.

Furthermore, according to the bathtub apparatus 1 of this embodiment, the amount of change in the bather's body temperature is estimated based on the bather's heart rate acquired by the heart rate acquisition unit 57, so the amount of change in the bather's body temperature can be acquired without forcing the bather to assume a bathing position.

Furthermore, with the bathtub apparatus 1 of this embodiment, after the bather is given a cooling or warming stimulus for a predetermined period of time, the speaker 6b, which serves as the notification unit, prompts the bather to exit the bath. This allows the bather to exit the bath when their body temperature reaches a temperature suitable for falling asleep, more effectively helping the bather fall asleep.

The bathtub device according to an embodiment of the present invention has been described above, but various modifications can be made to the above-described embodiment. In particular, in the above-described embodiment, the bather's electrocardiogram signal is detected using electrodes provided on the bathtub body, and the amount of change in the bather's body temperature is estimated based on this. However, as a modified example, the present invention can also be configured so that the control unit 64 of the control unit 6 estimates the amount of change in the bather's body temperature based on the elapsed time detected by the elapsed time detection unit 60 and the hot water temperature acquired by the hot water temperature acquisition unit 62.

Figure 10 is a graph showing an example of the change in deep body temperature over time after a bather enters the bathtub body 2 filled with hot water. As shown in Figure 10, the bather's deep body temperature begins to rise a certain amount of time after immersion in hot water, and continues to rise over time. Based on this relationship between elapsed time and deep body temperature, the amount of change in the bather's body temperature can be estimated.

In this variant, the amount of change in the bather's body temperature is estimated based on the elapsed time and the temperature of the hot and cold water, making it possible to obtain the amount of change in the bather's body temperature without placing a burden on the bather.

In the above-described embodiment, a water discharge device 8 and the like are provided as a heating/cooling device that provides warm and cool sensations to the bather. However, as a variation, a heating/cooling device can be installed on the ceiling of the bathroom, and this can serve as a heating/cooling device that sends warm air that is higher than the temperature of the water in the bathtub body and cool air that is lower than the temperature of the water in the bathtub body 2 to the bather in the bathtub body 2. The present invention can also be configured to provide a mist generator as a heating/cooling device, generating mist in the bathroom or bathtub body 2 that is higher than the temperature of the water in the bathtub body and mist that is lower than the temperature of the water in the bathtub body, thereby providing warm and cool sensations to the bather. Furthermore, the present invention can also be configured to provide a heating/cooling device that can heat and cool the wall surface, such as the backrest surface 2a of the bathtub body 2, and use this as a heating/cooling device to provide warm and cool sensations to the bather.

REFERENCE SIGNS LIST 1 Bathtub device 2 Bathtub body 2a Backrest surface 2b Apron 4a Negative electrode 4b Positive electrode 4c Reference electrode 6 Control unit 6a Remote control 6b Speaker (notification unit)
7 Air temperature sensor 8 Water discharge device 8a Water outlet 9 Circulation device 9a Bathtub water outlet 9b Bathtub water intake 10 Electrode part 10a Disk part 10b Shaft part 12a Front gasket 12b Rear gasket 14 Flange 16 Moisture-proof tube 18 Connection terminal 20 Fixing screw 22 Conductor 24 Sheath 40a High-temperature hot water supply pipe 40b Low-temperature hot water supply pipe 42a High-temperature side linear valve 42b Low-temperature side linear valve 44 Mixing chamber 46 Bathtub temperature sensor 48 Discharge water temperature sensor 50a High-temperature side temperature sensor 50b Low-temperature side temperature sensor 52 Water heater 54 Tap water 54a Branch part 56 Environmental temperature acquisition part 57 Heart rate acquisition part 58 Body temperature acquisition part 60 Elapsed time detection part 62 Hot water temperature acquisition part 64 Control part

Claims (7)

A bathtub device that can give a bather a warming stimulus and a cooling stimulus,
A bathtub body for storing hot water;
a water temperature acquisition unit that acquires the temperature of the water stored in the bathtub body;
a heating/cooling device that applies a warming stimulus higher than the temperature of the hot water acquired by the hot water temperature acquisition unit and a cooling stimulus lower than the temperature of the hot water to specific parts of the body of the bather;
an environmental temperature acquisition unit that acquires information about the temperature;
a control unit that controls the heating/cooling device based on the temperature information acquired by the environmental temperature acquisition unit,
The control unit controls the heating/cooling device to give the bather a warming sensation when the air temperature acquired by the environmental temperature acquisition unit is lower than a first temperature, and controls the heating/cooling device to give the bather a cooling sensation when the air temperature acquired by the environmental temperature acquisition unit is higher than a second temperature. The bathtub apparatus of claim 1, wherein the heating/cooling device is positioned above the surface of the hot and cold water stored in the bathtub body, and provides warming and cooling stimuli to parts of the bather's body above the surface of the hot and cold water stored in the bathtub body. The bathtub apparatus according to claim 1 or 2, wherein the control unit controls the heating/cooling device to start providing a cooling or warming stimulus to the bather a predetermined time after the bather enters the bathtub body. The bathtub apparatus of claim 3 further comprises a body temperature acquisition unit that acquires the amount of change in the bather's body temperature after the bather enters the bathtub main body, and the predetermined time varies depending on the amount of change in the bather's body temperature after the bather enters the bathtub main body. The bathtub apparatus of claim 4 further comprises a heart rate acquisition unit that acquires the bather's heart rate, and the control unit estimates the amount of change in the bather's body temperature based on the bather's heart rate acquired by the heart rate acquisition unit. The bathtub apparatus of claim 4 further comprises an elapsed time detection unit that detects the amount of time that has elapsed since the bather entered the bathtub body, and the control unit estimates the amount of change in the bather's body temperature based on the elapsed time detected by the elapsed time detection unit and the water temperature acquired by the water temperature acquisition unit. The bathtub apparatus of claim 3 further comprises an alarm unit, wherein the control unit prompts the bather to exit the bath after providing the bather with a cooling or warming stimulus for a predetermined period of time.