JP6839408B2 - Automatic faucet - Google Patents

Description

Aspects of the present invention generally relate to automatic faucets.

For example, in an automatic faucet equipped with a radio wave sensor such as a microwave sensor, at least a part of the radio wave is applied to the water discharge flow, the water stoppage threshold is determined based on the detection signal obtained only when the water discharge flow is used, and the threshold value is set. It is known that water stoppage is performed when the state in which the detection signal falls below continues for a predetermined time (for example, Patent Document 1).

On the other hand, there is also known a faucet that can switch between a plurality of water discharge forms such as a single water discharge (rectified water discharge) and a shower water discharge in a vanity or a system kitchen.

There is a demand for an automatic faucet equipped with a radio wave sensor to be able to switch between a plurality of water discharge modes. However, when the threshold value is determined according to the water discharge flow as described above, the tendency of the detection signal changes when the water discharge form is switched, and there is a possibility that the water discharge stop cannot be controlled appropriately.

Therefore, it is desired that an automatic faucet equipped with a radio wave sensor can appropriately control the water discharge stop even when a plurality of water discharge modes are switched.

Japanese Unexamined Patent Publication No. 2009-150190

The present invention has been made based on the recognition of such a problem, and an object of the present invention is to provide an automatic faucet capable of appropriately controlling water discharge and stoppage by detection by a radio wave sensor even when a plurality of water discharge modes are switched. And.

The first invention is to switch between a water spouting portion having a first spouting mode and a second spouting mode different from the first spouting mode, and switching between the first spouting mode and the second spouting mode of the spouting portion. A unit, a radio wave sensor that detects an object to be detected and outputs a detection signal, and a control unit that controls water discharge stop from the water discharge unit based on the detection signal from the radio wave sensor. The detection signal when water is discharged from the water discharge unit in the second water discharge mode is larger than the detection signal when water is discharged from the water discharge unit in the first water discharge mode, and the control unit has the same as the first water discharge mode. The control of water stoppage of the water discharge unit is switched between the second water discharge mode, and the control unit sets a first threshold value for the detection signal in the first water discharge mode, and the second water discharge mode. At the time of, a second threshold value is set for the detection signal, and the second threshold value is higher than the first threshold value .

According to this automatic faucet, the control of water stoppage can be switched between the first water discharge mode and the second water discharge mode. Therefore, even when the first water discharge mode and the second water discharge mode are switched, the radio wave sensor is used. By the detection, the water stoppage can be appropriately controlled. Therefore, it is possible to suppress erroneous water discharge from the automatic faucet.

In the second invention, in the first invention, the control unit controls the water discharge stop based on the amplitude value of the detection signal, and the first threshold value and the second threshold value are threshold values with respect to the amplitude value. It is an automatic faucet characterized by being present.

According to this automatic faucet, when the first water discharge form and the second water discharge form are switched by setting the first threshold value in the first water discharge form and setting the second threshold value in the second water discharge form. In addition, it is possible to control the water stoppage more reliably.

According to the third invention, in the first or second invention, the time from when the detected body exits the detection region of the radio wave sensor to when the water discharge portion is stopped in the second water discharge mode is determined. In the first water discharge mode, the automatic faucet is characterized in that it is longer than the time from when the detected body exits the detection region of the radio wave sensor until the water discharge portion is stopped.

According to this automatic faucet, it is possible to more accurately control the water stoppage in the second water discharge mode by lengthening the time until the water is stopped in the second water discharge mode.

The fourth invention is in any one of the first to third inventions, the control unit determines whether the water discharged from the water discharge unit is the first water discharge form or the second water discharge form. It is an automatic faucet characterized in that a determination is made based on the detection signal and the control of water stoppage of the water discharge portion is switched.

According to this automatic faucet, it is possible to reliably switch the control of water stoppage between the first water discharge form and the second water discharge form. Further, by using the detection signal for the determination, it is possible to suppress an increase in the number of parts.

The fifth invention further includes, in any one of the first to third inventions, a detection unit for detecting switching between the first water discharge mode and the second water discharge mode by the switching unit, and the control unit. Is an automatic faucet characterized in that the control of water stoppage of the water discharge unit is switched based on the detection result of the detection unit.

According to this automatic faucet, it is possible to reliably switch the control of water stoppage between the first water discharge form and the second water discharge form.

According to the aspect of the present invention, there is provided an automatic faucet capable of appropriately controlling spouting and stopping water by detection by a radio wave sensor even when a plurality of spouting modes are switched.

It is a block diagram which shows the automatic faucet which concerns on 1st Embodiment. 2 (a) to 2 (d) are graphs showing an example of the detection signal. It is a flowchart which shows the operation of the automatic faucet which concerns on 1st Embodiment. It is a block diagram which shows the automatic faucet which concerns on 2nd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each drawing, similar components are designated by the same reference numerals and detailed description thereof will be omitted as appropriate.
(First Embodiment)
FIG. 1 is a block diagram showing an automatic faucet according to the first embodiment.
As shown in FIG. 1, the automatic faucet 10 includes a water discharge unit 12, a switching unit 14, a solenoid valve 16, a radio wave sensor 18, and a control unit 20. The automatic faucet 10 is used, for example, in a vanity or a system kitchen.

The water discharge unit 12 discharges water to a washbasin, a kitchen sink, or the like. The water spouting portion 12 is a so-called spout. The water spouting unit 12 has a first spouting port 31 and a plurality of second spouting ports 32. The water spouting unit 12 has a first spouting mode in which water is spouted from the first spouting port 31, and a second spouting mode in which water is spouted from each of the plurality of second spouts 32.

The first water discharge mode is, for example, rectified water discharge that discharges water in the form of one water stream, foam water discharge that contains a plurality of bubbles in one water stream, and the like. The second spouting form is, for example, a shower spouting that discharges water in the form of a water stream or a water droplet from each of the plurality of second spouting ports 32, a foam shower spouting water that contains bubbles in the water stream of the shower-shaped spouting water or the water droplets, and the like. is there.

The second water discharge form is, for example, a water discharge form in which water is discharged in a wider range than the first water discharge form. As described above, the water discharge unit 12 has a first water discharge form and a second water discharge form different from the first water discharge form.

The plurality of second spouts 32 may be arranged in a two-dimensional matrix or in a line. That is, the shower water discharge may be a water discharge form in which a bundle of a plurality of water streams is discharged, or a water discharge form in which a plurality of water streams are arranged in a line and discharged in a wide width.

The switching unit 14 switches between the first water discharge form and the second water discharge form of the water discharge unit 12. The switching unit 14 switches between the first spouting mode and the second spouting mode by switching between, for example, a path for supplying water to the first spout 31 and a path for supplying water to each second spout 32. Switch. The switching unit 14 may be provided separately from the water discharge unit 12, or may be provided in the water discharge unit 12.

The solenoid valve 16 is connected to the switching unit 14 and is connected to a water supply source such as a water supply pipe. By opening the solenoid valve 16, water is discharged from the water discharge unit 12, and by closing the solenoid valve 16, the discharge of water from the water discharge unit 12 is stopped.

The radio wave sensor 18 detects the object to be detected and outputs a detection signal. The radio wave sensor 18 detects, for example, a user's hand extended in front of the water discharge unit 12 as a body to be detected. The radio wave sensor 18 is, for example, a microwave sensor. The radio wave sensor 18 transmits microwaves, receives reflected waves reflected by an object to be detected such as a user's hand, and measures the phase difference and frequency difference between the transmitted waves and the received waves so that the object can receive radio waves. It detects whether the sensor 18 is moving in the approaching direction or the away direction, the moving speed of the object, and the like. The detection signal output from the radio wave sensor 18 is, for example, a Doppler signal.

The frequency of the microwave transmitted by the radio wave sensor 18 is preferably in the GHz (gigahertz) band, and is, for example, 10.50 GHz or more and 10.55 GHz or less.

Further, the radio wave sensor 18 is arranged so that at least a part of the radiated radio waves hits the water discharge flow discharged from the first water discharge port 31 and the water discharge flow discharged from at least a part of each of the second water discharge ports 32. Will be done. That is, the radio wave sensor 18 irradiates the radio wave toward the water discharge flow from the first water discharge port 31 or the water discharge flow from the second water discharge port 32, and receives the radio wave reflected by the water discharge port.

The control unit 20 is electrically connected to the solenoid valve 16 and the radio wave sensor 18. The control unit 20 controls the water discharge stop from the water discharge unit 12 by controlling the opening and closing of the solenoid valve 16 based on the detection signal from the radio wave sensor 18.

2 (a) to 2 (d) are graphs showing an example of the detection signal.
FIG. 2A shows an example of the detection signal DS when there is no object to be detected in the detection region of the radio wave sensor 18 in the first water discharge mode. That is, FIG. 2A shows an example of the detection signal DS when water is discharged from the first spout 31 in a state where the user does not extend his / her hand or the like.

FIG. 2B shows an example of the detection signal DS when the object to be detected is in the detection region of the radio wave sensor 18 in the first water discharge mode. That is, FIG. 2B shows an example of the detection signal DS when the user is washing his / her hand by spouting water from the first spout 31.

2 (c) and 2 (d) show an example of the detection signal DS when water is discharged from each of the second spouts 32 in a state where the user does not extend his / her hand or the like. In FIGS. 2A to 2D, the horizontal axis is time and the vertical axis is voltage.

As shown in FIGS. 2A to 2D, the detection signal DS is a signal that oscillates in a wavy manner. The detection signal DS is, for example, a signal of the difference between the transmitted wave and the received wave of the radio wave sensor 18. When the user washes his hands, the reflected wave is disturbed due to the turbulence of the water discharge flow and the movement of the user's hand, and the difference between the transmitted wave and the received wave becomes large. That is, as shown in FIGS. 2A and 2B, when hand washing or the like is performed, the amplitude of the detection signal DS becomes larger than when it is not performed.

The control unit 20 sets the first threshold value th1 with respect to the amplitude value of the detection signal DS in the first water discharge mode. For example, the control unit 20 sets the first threshold value th1 on the positive side and the negative side with respect to the center of the amplitude of the detection signal DS output by the radio wave sensor 18. In other words, the control unit 20 sets a first upper limit value and a first lower limit value with respect to the amplitude value of the detection signal DS.

The first threshold value th1 is set to a size such that the detection signal DS becomes less than the first threshold value th1 when water is discharged from the water discharge unit 12 in the first water discharge form without the object to be detected. Then, the first threshold value th1 is set to a size such that the detection signal DS becomes the first threshold value th1 or more when the object to be detected is present.

When the detection signal DS changes from a state of less than the first threshold value th1 to a state of the first threshold value th1 or more, the control unit 20 opens the solenoid valve 16 and discharges water from the water discharge unit 12. Then, when the detection signal DS changes from the state of the first threshold value th1 or more to the state of less than the first threshold value th1, the control unit 20 closes the solenoid valve 16 and stops the water discharge from the water discharge unit 12. As a result, the water discharge stop from the water discharge unit 12 is automatically switched in response to the operation of extending the user's hand or the like.

In the second water discharge form such as shower water discharge, the reflected wave is more likely to be disturbed than in the first water discharge form such as rectified water discharge. Therefore, the detection signal DS when water is discharged from the water discharge unit 12 in the second water discharge mode is larger than the detection signal DS when water is discharged from the water discharge unit 12 in the first water discharge mode.

The second water discharge form is not limited to shower water discharge and foam shower water discharge, and may be any water discharge form in which the detection signal DS becomes larger than the first water discharge form as described above due to turbulence of the water discharge flow or the like. Further, the first water discharge form is not limited to rectified water discharge and foam discharge water, and may be any water discharge form. The first spouting form is not necessarily limited to the spouting form of spouting water from one spout, and may be a spouting form of spouting water from a plurality of spouts. The second spouting form is not limited to the spouting form of spouting water from a plurality of spouts, and may be a spouting form of spouting water from one spout.

Therefore, as shown in FIG. 2C, the first threshold value th1 is set for the detection signal DS when the water discharge unit 12 is discharging water in the second water discharge form without the detected object. Then, the detection signal DS may exceed the first threshold value th1 even though there is no object to be detected. That is, there is a possibility that water will remain discharged from the water discharge unit 12 even after the user leaves the automatic faucet 10.

Therefore, the control unit 20 sets the second threshold value th2 with respect to the amplitude value of the detection signal DS in the second water discharge mode. The control unit 20 sets, for example, a second upper limit value and a second lower limit value with respect to the amplitude value of the detection signal DS. The second threshold value th2 is higher than the first threshold value th1. When the thresholds are set on the positive side and the negative side with respect to the center of the amplitude of the sinusoidal transmitted wave, the absolute value of the second threshold th2 is higher than the absolute value of the first threshold th1.

The second threshold value th2 is set to a size such that the detection signal DS becomes less than the second threshold value th2 when water is discharged from the water discharge unit 12 in the second water discharge form in the absence of the detected object. Then, the second threshold value th2 is set to a size such that the detection signal DS becomes the second threshold value th2 or more when the object to be detected is present.

For example, after starting water discharge based on the first threshold value th1, the control unit 20 determines whether the water discharge from the water discharge unit 12 is the first water discharge form or the second water discharge form based on the detection signal DS. Then, the water stop control of the water discharge unit 12 is switched.

For example, when the hand is washed in the second water discharge form, the detection signal DS becomes larger than that in the case where the hand is washed in the first water discharge form. Therefore, for example, the control unit 20 determines whether or not the detection signal DS is equal to or greater than a predetermined value after starting water discharge when the first threshold value th1 or more is reached, and if it is less than a predetermined value, the first water discharge is performed. It is determined to be a form, and if it is equal to or more than a predetermined value, it is determined to be a second water discharge form.

When the control unit 20 determines the first water discharge mode, the first threshold value th1 is set as described above, and when the detection signal DS becomes less than the first threshold value th1, the solenoid valve 16 is closed. Then, the water discharge from the water discharge unit 12 is stopped. Then, the control unit 20 sets the second threshold value th2 when determining the second water discharge mode, and when the detection signal DS becomes less than the second threshold value th2, the solenoid valve 16 is closed to discharge water. Stop the water discharge from the part 12.

The threshold value for determining the start of water discharge may be the first threshold value th1 or the second threshold value th2. For example, the first threshold value th1 or the second threshold value th2 used at the time of the previous water stoppage may be used for the determination of the next water discharge start, or only the first threshold value th1 may be used for the determination of the water stoppage start. Good. Further, a third threshold value th3 different from the first threshold value th1 and the second threshold value th2 may be used exclusively for determining the start of water discharge.

FIG. 3 is a flowchart showing the operation of the automatic faucet according to the first embodiment.
As shown in FIG. 3, when the control unit 20 of the automatic faucet 10 starts the water discharge determination control, it determines whether or not the amplitude of the detection signal DS is equal to or greater than the first threshold value th1 (step S1 of FIG. 3). S2). When using the automatic faucet 10, the user extends his / her hand or the like in front of the water spouting unit 12. At this time, the user switches between the first water discharge form and the second water discharge form by operating the switching unit 14 as necessary.

When the control unit 20 determines that the amplitude of the detection signal DS is equal to or greater than the first threshold value th1, the solenoid valve 16 is switched from the closed state to the open state, and water discharge from the water discharge unit 12 is started (step S3 in FIG. 3). .. At this time, when the first water discharge form is selected by the switching unit 14, water is discharged from the first water discharge port 31 to execute the water discharge in the first water discharge form, and the second water discharge form is selected. If so, water is discharged from each of the second spouts 32, and water spouting in the second spouting mode is executed.

When the control unit 20 starts water discharge, the control unit 20 subsequently starts water stop determination control (step S4 in FIG. 3). When the control unit 20 starts the water stop determination control, the control unit 20 determines whether the water discharge from the water discharge unit 12 is the first water discharge mode or the second water discharge mode based on the detection signal DS (step S5 in FIG. 3). ).

When the control unit 20 determines that the water discharge mode is the first, the control unit 20 sets the first threshold value th1 with respect to the amplitude value of the detection signal DS (step S6 in FIG. 3). Then, the control unit 20 determines whether or not the amplitude value of the detection signal DS is less than the first threshold value th1 (step S7 in FIG. 3).

When the control unit 20 determines that the amplitude value of the detection signal DS is equal to or greater than the first threshold value th1, it determines that there is an object to be detected, and continues to discharge water from the water discharge unit 12.

On the other hand, when the control unit 20 determines that the amplitude value of the detection signal DS is less than the first threshold value th1, is the state in which the amplitude value of the detection signal DS is less than the first threshold value th1 continued for the first time? Whether or not it is determined (step S8 in FIG. 3).

When the amplitude value of the detection signal DS becomes the first threshold value th1 or more again before the lapse of the first time, the control unit 20 continues the water discharge from the water discharge unit 12 without stopping the water. Then, when the first time elapses, the control unit 20 determines that there is no object to be detected, switches the solenoid valve 16 from the open state to the closed state, and stops the water discharge from the water discharge unit 12 (FIG. 3). Step S9).

When the control unit 20 determines in step S5 that it is in the second water discharge mode, the control unit 20 sets the second threshold value th2 with respect to the amplitude value of the detection signal DS (step S10 in FIG. 3). Then, the control unit 20 determines whether or not the amplitude value of the detection signal DS is less than the second threshold value th2 (step S11 in FIG. 3).

When the control unit 20 determines that the amplitude value of the detection signal DS is equal to or greater than the second threshold value th2, the control unit 20 determines that there is an object to be detected and continues water discharge from the water discharge unit 12.

On the other hand, when the control unit 20 determines that the amplitude value of the detection signal DS is less than the second threshold value th2, is the state in which the amplitude value of the detection signal DS is less than the second threshold value th2 continued for the second time? It is determined whether or not (step S12 in FIG. 3).

When the amplitude value of the detection signal DS becomes the second threshold value th2 or more again before the lapse of the second time, the control unit 20 continues the water discharge from the water discharge unit 12 without stopping the water. Then, when the second time elapses, the control unit 20 determines that there is no object to be detected, switches the solenoid valve 16 from the open state to the closed state, and stops the water discharge from the water discharge unit 12 (FIG. 3). Step S9).

The second hour is longer than the first hour. That is, the control unit 20 sets the water stop determination time longer in the second water discharge mode than in the first water discharge mode.

In the second water discharge mode, the amplitude value of the detection signal DS fluctuates more than in the first water discharge mode, and the amplitude value of the detection signal DS temporarily becomes less than the second threshold value even in the presence of the detected object. There is a possibility. The control unit 20 sets the water stop determination time longer in the second water discharge mode than in the first water discharge mode. As a result, it is possible to prevent the water discharge from the water discharge unit 12 from stopping unintentionally.

In this way, the control unit 20 makes the second time longer than the first time. Therefore, in the automatic faucet 10, the time from when the detected body comes out of the detection region of the radio wave sensor 18 in the second water discharge mode until the water discharge unit 12 is stopped is the time for the detected body in the first water discharge mode. It takes longer than the time from when the water discharge unit 12 comes out of the detection area of the radio wave sensor 18 until the water discharge unit 12 is stopped.

When the control unit 20 stops the water discharge from the water discharge unit 12, the control unit 20 returns to the operation of step S1 and repeats the same process thereafter.

As described above, in the automatic faucet 10 according to the present embodiment, the control of water stoppage can be switched between the first water discharge mode and the second water discharge mode. Even when the above is switched, the water stoppage can be appropriately controlled by the detection by the radio wave sensor 18. Therefore, it is possible to suppress erroneous water discharge from the automatic faucet 10.

Further, in the automatic faucet 10, the first threshold value th1 is set in the first water discharge mode, and the second threshold value th2 is set in the second water discharge mode to switch between the first water discharge mode and the second water discharge mode. Even in such a case, the water stoppage can be controlled more reliably.

For example, if the first threshold value th1 is set for the amplitude value of the detection signal DS in the second water discharge mode such as shower water discharge, it is detected even after the user leaves the automatic faucet 10 after the water discharge is started. There is a possibility that the amplitude value of the signal DS becomes the first threshold value th1 or more, and the water cannot be stopped. On the contrary, if the second threshold value th2 is set for the amplitude value of the detection signal DS in the first water discharge mode such as rectified water discharge, the detection signal DS is performed even though the user is washing his / her hands. The amplitude value of is temporarily less than the second threshold value th2, and water discharge may be stopped unintentionally. In the automatic faucet 10, by switching between the first threshold value th1 and the second threshold value th2, such erroneous water discharge can be suppressed more reliably.

Further, in the automatic faucet 10, the water stoppage in the second water discharge form can be controlled more accurately by lengthening the time until the water is stopped in the second water discharge form. For example, it is possible to prevent the water discharge from the water discharge unit 12 from stopping unintentionally.

Further, in the automatic faucet 10, the control unit 20 determines whether the water discharge from the water discharge unit 12 is the first water discharge form or the second water discharge form based on the detection signal DS. Thereby, the control of the water stoppage of the first water discharge form and the second water discharge form can be surely switched. Further, by using the detection signal for the determination, it is possible to suppress an increase in the number of parts. For example, the manufacturing cost of the automatic faucet 10 can be suppressed.

(Second Embodiment)
FIG. 4 is a block diagram showing an automatic faucet according to a second embodiment.
As shown in FIG. 4, the automatic faucet 50 further includes a detection unit 52. Those having substantially the same functions and configurations as those of the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

The detection unit 52 detects switching between the first water discharge form and the second water discharge form by the switching unit 14. The detection unit 52 is electrically connected to the control unit 20. The detection unit 52 inputs the switching detection result of the switching unit 14 to the control unit 20. The detection unit 52 may be any switch or sensor such as a mechanical switch, an optical sensor, or a magnetic sensor that can detect the switching of the water discharge form by the switching unit 14.

The control unit 20 switches the water stop control of the water discharge unit 12 based on the detection result of the detection unit 52. For example, when the first water discharge form is detected by the detection unit 52, the control unit 20 sets the first threshold value th1 with respect to the amplitude value of the detection signal DS to control water stoppage, and the detection unit 52 controls the water stoppage. When the second water discharge form is detected by the above, the second threshold value th2 is set for the amplitude value of the detection signal DS to control the water stoppage.

In the automatic faucet 50 according to the present embodiment, the control unit 20 switches the water stop control of the water discharge unit 12 based on the detection result of the detection unit 52. Also in this case, the control of water stoppage of the first water discharge form and the second water discharge form can be reliably switched. As described above, the first water discharge form and the second water discharge form may be detected based on the detection signal DS or may be detected by the detection unit 52.

In each of the above embodiments, the first threshold value th1 and the second threshold value th2 are set with respect to the amplitude value of the detection signal DS. Not limited to this, for example, the first threshold value th1 and the second threshold value th2 may be set for the dispersion value of the detection signal DS (Doppler signal) to control the water stoppage of the water discharge unit 12. More specifically, the variance value is a value representing the fluctuation of the amplitude of the detection signal DS during a predetermined time. The dispersion value of the detection signal DS increases as the object to be detected approaches the radio wave sensor 18 and the fluctuation of the amplitude of the detection signal DS increases. Therefore, even when the first threshold value th1 and the second threshold value th2 are set for the dispersion value of the detection signal DS, water stoppage is appropriately controlled and erroneous water discharge is suppressed as in the case of the amplitude value. Can be done.

The embodiments of the present invention have been described above. However, the present invention is not limited to these descriptions. With respect to the above-described embodiment, those skilled in the art with appropriate design changes are also included in the scope of the present invention as long as they have the features of the present invention. For example, the shape, size, material, arrangement, etc. of each element included in the automatic faucets 10, 50, etc. are not limited to those exemplified, and can be changed as appropriate.
In addition, the elements included in each of the above-described embodiments can be combined as much as technically possible, and the combination thereof is also included in the scope of the present invention as long as the features of the present invention are included.

10, 50 Automatic faucet, 12 Water spout, 14 Switching part, 16 Solenoid valve, 18 Radio sensor, 20 Control unit, 31 1st water spout, 32 2nd spout, 52 Detector

Claims (5)

A water discharge unit having a first water discharge form and a second water discharge form different from the first water discharge form.
A switching unit for switching between the first water discharge form and the second water discharge form of the water discharge unit,
A radio wave sensor that detects the object to be detected and outputs a detection signal,
A control unit that controls water discharge from the water discharge unit based on the detection signal from the radio wave sensor, and a control unit.
With
The detection signal when water is discharged from the water discharge portion in the second water discharge mode is larger than the detection signal when water is discharged from the water discharge portion in the first water discharge mode.
The control unit switches the control of water stoppage of the water discharge unit between the first water discharge mode and the second water discharge mode .
The control unit sets a first threshold value for the detection signal in the first water discharge mode, and sets a second threshold value for the detection signal in the second water discharge mode.
The automatic faucet, characterized in that the second threshold value is higher than the first threshold value. The control unit controls the water discharge stop based on the amplitude value of the detection signal.
The automatic faucet according to claim 1, wherein the first threshold value and the second threshold value are threshold values with respect to the amplitude value. In the second water discharge mode, the time from when the detected body exits the detection region of the radio wave sensor until the water discharge portion is stopped is the time when the detected body is the radio wave sensor in the first water discharge mode. The automatic faucet according to claim 1 or 2, wherein the time from when the faucet comes out of the detection area until the water discharge portion is stopped is longer than the time. The control unit determines whether the water discharge from the water discharge unit is the first water discharge form or the second water discharge form based on the detection signal, and switches the control of water stoppage of the water discharge unit. The automatic faucet according to any one of claims 1 to 3. A detection unit for detecting switching between the first water discharge mode and the second water discharge mode by the switching unit is further provided.
The automatic faucet according to any one of claims 1 to 3, wherein the control unit switches control of water stoppage of the water discharge unit based on the detection result of the detection unit.

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