JP2009235732A - Hand wash unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that the state of not having running water is brought about depending on an object to be washed, which is stretched out by a user of a faucet device. <P>SOLUTION: A radio wave sensor is arranged at the end of a water receiving portion; detection areas are arranged near the radio wave sensor inside the water receiving portion and near a spout of the faucet device, respectively; and a water supply stop area is provided between the detection areas. A hand stretching action and a hand washing action in the use of a hand wash unit are separated from each other, and objects to be detected, corresponding to the respective actions, are detected in the two detection areas, so that the water can be supplied from the faucet device. In addition, since the water supply stop area is positioned between the detection areas, the hand wash unit can rapidly stop the supply of the water in the implementation of an action which dispenses with the water. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a faucet device provided in, for example, a hand-washing place of a public toilet, a bathroom vanity, or a kitchen, and detects water to be washed or a cup held by the user's hand or the user. The present invention relates to a hand-washing device that controls water discharged from a stopper device.

  When you do not want to touch the faucet device with wet hands after hand washing, or when you have a cooking utensil, food, etc. and your hand is full, water discharge starts automatically without operating the faucet faucet There is an automatic faucet device that can be used.

  Patent Document 1 discloses a system in which two types of detection sensors are arranged on a kitchen sink to continuously detect not only washing but also other dishes at the time of dishwashing and prevent them from being left after washing. is doing.

Japanese Patent Laid-Open No. 4-83027

  The conventional technique described in Patent Document 1 described above is a system in which a valve is opened when an object such as a human body or tableware is detected in a kitchen sink, and tap water is supplied from a water outlet. In addition, since two sensors, the area near the spout and the wide area, are arranged for object detection, even if tableware or cooking utensils are detected by the sensor for wide area detection, the human body near the spout for a certain period of time. If it is not detected, it is an easy-to-use system that can stop the supply of tap water.

  However, since the light-receiving / detecting element is used as the detecting means, and the light-receiving element detects a part of the amount of infrared rays radiated from the light-projecting element reflected from the detected object, it is a detected object. Depending on the material and color of the tableware and cooking utensils, something that cannot be detected occurs. For example, a black object such as a frying pan or a transparent cup absorbs or transmits infrared light emitted from the light emitting element, so that the reflected light does not reach the light receiving element. The supply of tap water will not be performed if the detected object is simply put out near the water outlet.

  In recent years, wash bowls (or sink sinks) and faucet fittings have been proposed in various forms in consideration of harmony with the interior, and tap water has been supplied from the top to the bottom. In addition to the trajectory of the water flow, it has various parabolas such as discharging water obliquely upward and forward. On the other hand, the user puts his hand down the spout regardless of the shape of the faucet device, so the area where the detection means detects the object to be detected and the area where the user puts out the washing object or hand match. However, tap water may not be supplied, or water may be stopped during use even though water discharge is once started and water is used. Therefore, in order to find the detection point, the detected object is swung up and down, left and right, or moved closer to the very vicinity of the spout, which is not user-friendly and is hand-washed at a place other than the predetermined cleaning position. Therefore, there was a problem that the washing water splashes in addition to the wash bowl, and the surrounding area becomes wet and unsightly.

  Accordingly, an object of the present invention is to provide an easy-to-use hand-washing device in which water discharge starts immediately when a person using a water faucet device puts it out regardless of an object to be cleaned.

In order to achieve the above object, according to one aspect of the present invention, a water discharger for discharging tap water;
A valve unit for switching water discharge from the water discharge unit;
A water receiving portion for receiving tap water discharged from the water discharging portion;
An antenna that radiates radio waves and receives a reflected signal reflected by the object to be detected;
A detection unit that obtains information of the object to be detected by a reflected signal received by the antenna;
A control unit that controls opening and closing of the valve based on a detection signal output from the detection unit,
The antenna is disposed in the water receiving unit so as to radiate radio waves toward the water discharging unit,
The controller is
When the valve is closed, the valve is controlled to open and close based on the differential signal that has passed through the frequency filter of the first frequency band,
When the valve is in an open state, the valve is controlled to open and close based on a differential signal that has passed through a frequency filter in a second frequency band.

  In order to achieve the above object, according to one aspect of the present invention, the frequency filter of the second frequency band is a filter having a higher frequency band than the frequency filter of the first frequency band. To do.

In order to achieve the above object, according to one aspect of the present invention,
The controller is
Based on detection information obtained from two independent detection areas, the valve opening / closing control is performed based on the detection signal output from the detection unit,
The two detection areas are a first detection area for detecting a deceleration change of a user's hand approaching the water receiving part, and a second detection for detecting the speed of the water flow supplied from the water discharging part. It consists of an area.

Furthermore, according to one aspect of the present invention to achieve the above object,
The detection unit has a plurality of amplification factors, and the second detection area is determined with a larger amplification factor than the first detection area.

  ADVANTAGE OF THE INVENTION According to this invention, when a user uses a water faucet device, the user-friendly hand washing apparatus which does not get lost in the position to put out a hand is provided.

Embodiments of a hand washing apparatus according to the present invention will be described below in detail with reference to the drawings.
(First embodiment)

  FIG. 1 (a) shows an overview of the first embodiment of the hand-washing apparatus, FIG. 1 (b) shows a top view of FIG. 1 (a), and FIG. 1 (c) shows FIG. 1 (b). A sectional view taken on line A is shown. FIG. 2 shows a control block diagram.

  A hand-washing device 10 shown in FIG. 1 is used in a faucet device 1 for supplying tap water, a ceramic water receiving portion 2 that receives water discharged from the faucet device 1, and the water receiving portion 2. From a radio wave sensor 3 for detecting that a body to be cleaned, such as a person's hand, a cup, or a cloth, has entered, a valve unit 4 for switching water discharged from the faucet device 1, and the radio wave sensor 3 The control unit 5 is configured to control on and off of the valve unit 4 based on the above signal. Here, the radio wave sensor 3 is disposed on the front side, which is the side facing when the user approaches the water receiving unit 2.

The hand-washing apparatus 10 has two detection areas. The first detection area a is the front side of the inner surface of the water receiving unit 2 and is set in the vicinity of the radio wave sensor 3. The second detection area b is The trajectory of water discharged from the faucet device 1 is set near the point where the trajectory of the water receiving portion intersects.
Since the radio wave sensor reflects against water or metal, it can be detected regardless of the material of the object to be detected. In the first detection area a, when an object to be cleaned such as a user's hand enters, The radio wave sensor 3 detects the object to be detected, and the result is transferred to the control unit 5. The control unit 5 opens the valve unit 4 and discharges tap water from the faucet device 1. Therefore, the 1st detection area a is an area which has a switch function, and provided the marker 6 with the glaze in the edge part 2a before this water-receiving part 2 so that a user may put out a hand easily However, as another method, the water receiving portion 2 is formed of a resin or glass material that transmits visible light, and a light emitting member such as an LED is turned on to induce the user's washing action. May be. The second detection area b is an area having an automatic water stop function for identifying whether to continue water supply from the faucet device 1 or to switch to water stop. It is set to control the opening and closing of the valve based on the detection information in the second detection area b for the first time when the presence of the user is detected and water discharge from the faucet device 1 is started. Supply tap water from the faucet device 1 for the act of putting your hand directly into this area before starting, or taking up things placed in the receiving part or picking up things placed in the receiving part There is no. Even when a detection signal for continuing the supply of tap water is obtained from the second detection area b, the water supply is stopped if a detection signal for stopping the water supply is obtained from the first detection area a. It has become. In addition, the radio wave sensor 3 is programmed so as not to continue to detect an object placed in the first detection area a during water supply and keep water out. A detailed control flow will be described later.

Next, the radio wave sensor 3 which is a detection means will be described with reference to FIG.
The radio wave sensor 3 includes an oscillation circuit 11 that generates radio waves, a transmission / reception integrated antenna 12 that transmits radio waves generated by the oscillation circuit 11 to a detected object, and receives reflected radio waves from the detected object, and an antenna 12. And a detection unit 13 that determines the presence / absence of an object to be detected based on the received signal. Although the antenna 12 may be a separate transmission / reception unit, in the present invention, in order to install the antenna 12 inside the water receiving unit 2, miniaturization is prioritized and integrated. Thus, the radio wave radiated from the radio wave sensor 3 can be transmitted if the material of the water receiving portion 2 is other than metal, and the amount of radio wave transmission depends on dirt such as water droplets and scales. Therefore, in other sensing methods such as an infrared sensor, an ultrasonic sensor, and a capacitance sensor, it can be disposed on the front side of the water receiving unit 2 that may not be installed and may become dirty.
The detection unit 13 includes a mixer unit 14 that mixes the local signal from the oscillation circuit 11 and the RF signal from the antenna 12, a low amplification unit 15 that amplifies the Doppler signal extracted by the mixer unit 14 at a low magnification, The frequency conversion unit 17 is configured to pass both the high amplification unit 16 that amplifies at a magnification and pass the signal after passing through each frequency analysis or only a predetermined frequency. The frequency conversion unit 17 may be configured by software processing or an electric circuit, but in the present invention, software processing is used. The frequency analysis performed by the frequency conversion unit 17 may use FFT analysis, but in the present invention, it has filters divided into a plurality of bands, and is performed depending on the presence or absence of waveforms after passing through each filter. is doing. Hereinafter, signal processing using this filter will be described.

  Next, the control flow of the discharge water from the faucet device 1 performed by the detection unit 13 will be described using the flowchart shown in FIG. 3 and the waveform of the Doppler signal shown in FIGS. 4 and 5.

  First, in S01, the detection unit 13 extracts the signal from the low amplification unit 15, and then in S02, the maximum value and the minimum value of the signal Vs when the frequency conversion unit 17 passes the low-pass filter of 10 Hz or less are obtained. It is determined whether Vs> V1 or Vs <V2. If a Doppler signal as shown in FIG. 4B is generated at this time, the detection unit 13 can determine that the user's hand has entered the first detection area a, and the valve unit is transferred from the detection unit 13 to the control unit 5 in S03. 4 is turned on, the valve unit 4 is opened, and tap water is supplied from the faucet device 1 toward the water receiving unit 2. At this time, the low amplification factor is related to the transmission intensity of the radio wave sensor 3, the antenna gain of the antenna 12, and the attenuation of the radio wave in the water receiving unit 2. However, when the radiated radio wave quantity is 10 mW or less, 10 It is set to less than double. Therefore, it is possible to identify and detect the movement of the hand that stops or holds the first detection area a in comparison with the threshold value V1 or V2, while moving the object in the water receiving portion 2 Since the detection signal Vs is small and does not exceed V1 or below V2, the radio wave sensor 3 determines that the movement is not an operation for the user to use the faucet device 1, and the faucet device 1 There is no supply of tap water. Moreover, it is the operation | movement which passes the upper part of the water-receiving part 2, and takes the cup of the back side of the faucet device 1, the operation | movement which cleans the faucet device 1, and also the speed of the water flow which drains the water of a cup is 10Hz. Since the detection signal Vs has almost no amplitude in the low-pass filter of 10 Hz or less because it is the above fast movement, the detection unit 13 determines that the movement is not an intrusion of the hand, and can secure water stop, It is possible to provide a hand-washing device that does not cause false water discharge. In this way, tap water supply can be started in a timely manner by identifying from the Doppler signal the speed change that decelerates and the slow movement just before stopping toward the faucet device in order to use the faucet device. . In order to take the change in speed at which the hand decelerates toward the hand-washing device more reliably, for example, a band pass filter with a band of 15 to 50 Hz is provided in the frequency converter, and a predetermined threshold value is first set to this band pass filter. After detecting the hand that is the object to be detected because the obtained Doppler signal is more than that, if the signal of the low pass filter of 10 Hz or less is extracted by the frequency conversion unit as described above, It can be detected reliably.

  Next, the detection unit 13 always keeps discharging tap water regardless of whether or not water is used during the travel time until the user supplies water from the first water supply area a to tap water in S04. The timer 1 (T) is counted for 1 second. During this time, in places where the hand-washing device 10 is installed, for example, in welfare facilities and multipurpose toilets, a longer time is set according to the relatively slow movement of the user, and the traffic of users such as stations, service areas, and airports is intense. When the moving speed is fast, it may be adjusted using an external switch (not shown) so that it can be arbitrarily changed, for example, shortened. Next, in S05, the detection unit 13 extracts a signal from the high amplification unit 16 in order to identify the user's cleaning state in the second detection area b, and then in S06, the frequency conversion unit 17 performs 1 Hz or more. It is determined whether the Doppler signal Vs when passing through the high-pass filter satisfies Vs> V5 or Vs <V6. At this time, when a waveform having a large amplitude as shown in FIG. 5A is obtained, a Doppler signal based on the water flow of tap water scattered by the user's hand or fingertip is shown. Part 4 is continued in the “on” state. However, when the maximum value and the minimum value of Vs shown in FIG. 5B are V3 <Vs <V5 or V4 <Vs <V6, the user finishes the hand washing operation, and the faucet device 1 water In S07, the detection unit 13 instructs the control unit 5 to turn off the valve unit 4 and the valve unit 4 is closed. However, in the case of V4 <Vs <V3 shown in FIG. 5 (c), the fluctuation of the water surface in the state where water supplied from the faucet device 1 is drawn into a cup or the like is detected. The detection unit 13 continues the valve unit 4 in the “on” state. Thereafter, when water overflows from the cup, in order to obtain a Doppler signal accompanying the reflected radio wave from the water scattered around the cup, the amplitude intensity as shown in FIG. Set part 4 to “off”.

  Another method of water stop control of the valve unit 4 in S06 of the detection unit 13 will be described using the Doppler signals of FIGS. FIG. 6A shows the same waveform as FIG. 5B, and the water splashes on the surface of the hand when the user puts his hand against the water in the second detection area and is washing the hand. The Doppler signal waveform after the reflected signal of the radio wave from the signal passes through the high amplification unit 16 in the detection unit 13 and passes through the high pass filter of 1 Hz or more in the frequency conversion unit 17. On the other hand, FIG. 6B shows a case where the frequency converter 17 passes 1 Hz after passing through the high amplifier 16 when the user is performing draining in the water supply stop area c shown in FIG. It is the Doppler signal waveform which passed the above high pass filter. Therefore, when the thresholds V7 and V8 are newly provided and the waveform of the Doppler signal in FIG. 6B is obtained, if the maximum and minimum values of the Doppler signal Vs become Vs> V7 or Vs <V8, the detection unit 13 The control unit 5 may be instructed to close the valve unit 4. In this way, in order to identify an operation other than the cleaning operation while supplying tap water, by providing threshold values V7 and V8 for identifying the maximum signal waveform, water supply of the radio wave sensor 3 is continued in the second detection area b. Since it is set as the detection area and the area on the near side including the first detection area a can be set as the water supply stop area, the water stop control of the hand washing device can be performed promptly after the faucet device is used. The handwashing operation has been explained, but the same can be said during cleaning of cooking utensils, toothbrushes, rags, etc. in addition to the hand. By doing so, it can be determined whether it is in use or the specification is finished, and the tap water can be supplied in a timely manner.

7A has the same waveform as FIG. 4A, and shows a state where the user puts his hand in the first detection area shown in FIG. 1 and his hand stops in the space above the radio wave sensor 3. 13 shows a Doppler signal waveform that has passed through a low-pass filter of 10 Hz or less in the frequency converter 17 after passing through the low amplifier 15 in FIG. On the other hand, FIG. 7B shows a Doppler signal waveform that has passed through the low-amplifier 15 when the user has put his hand in the water supply stop area c and then passed through a low-pass filter of 10 Hz or less in the frequency converter 17. is there.
As shown in FIG. 1 (c), the radio wave sensor 3 radiates a radio beam from the end 2a of the water receiving part 2 toward the faucet device 1, and therefore, the first and second detection areas and the gap therebetween. Even if a detected object is detected in the existing area, if the detected object exists in any of the water supply stop areas where the valve is not controlled, it can be detected. When the faucet device 1 is stopped, the valve 4 is turned on only when the detected object in the first detection area a is detected. The water supply state is continued only when the object to be detected is detected in the d detectable area b, and a plurality of detection areas and a water supply stop area can be realized in the radio wave beam. As described above, for the user, Like picking up something dropped in the water receiving section 2 There was an act of draining water between the radio wave sensor 3 and the second detection area b on the front side of the water receiving part 2 as described above, or an act of discarding the water in the cup. In some cases, the water can be quickly stopped.

  In the present invention, a capacitive element is inserted in series with the output signal at the subsequent stage of the high amplification circuit 16 so as not to be affected by the fluctuation of the base potential due to the phase interference wave obtained by the radio wave sensor 3, so that the bias potential is A high-pass filter of 1 Hz or higher was configured to reliably identify the water flow change between the purpose of cutting the water, the splashing water, the water surface drawn into the cup, and the water flow alone. When the change in water flow during hand washing, during drinking cup water and at the end of washing is obtained as the amplitude intensity of the Doppler signal by increasing the antenna gain, the signal after passing through the high amplification unit 16 without using the signal conversion unit 17 On the other hand, a threshold value may be set, and it may be determined whether the water discharge is continued or stopped by comparison with the threshold value as in S06. In that case, since the time delay due to the capacitive element does not occur, it is possible to immediately switch the valve unit 4 on and off in response to the user's operation, and it is possible to provide a hand-washing device having high-speed response. Become. Further, the magnification of the high amplification unit 16 needs to be low when close to the radio wave sensor 3 due to the trajectory of the water flow, and high when far away from the radio wave sensor 3, and when arbitrarily selected from magnifications of 500 to 2000 times, FIG. As shown, the state of the user can be easily determined using the change in the water flow. By using the high-pass filter in this way, it is possible to easily recognize a relatively fast change in water flow that is different from the movement of the user's hand. In addition, the detection unit decides whether to detect or not detect using the optimum amplification factor to detect the movement of the hand and the change in the water flow, which are two detection objects that differ in the amount of reflection of the radio wave depending on the area receiving the radio wave Therefore, it is possible to detect without missing two actions of the user, or because the amplification factor is reduced to see the movement of the hand entering the receiving part during water stoppage, the reflection area is reduced in the water flow in the receiving part. Small, unable to obtain received signal and does not detect discarded water. In addition, during water discharge, the amplification factor is increased to detect the water flow, so an object is placed near the radio sensor for oversized reflected signals that are generated because the distance between the radio sensor and the object to be detected is small. It is possible to provide a hand-washing device that does not leave the water untouched because it can be distinguished from actions during washing, such as whether or not a person is leaning.

As described above, when the first detection area a is provided in the vicinity of the front side of the water receiving portion 2 and is used as an operation switch, it is possible to concentrate on the act of “draining water from the faucet device 1”. As a result, tap water is supplied from the faucet device 1 and it becomes possible to put out a hand against the water from the faucet device in the second detection area b which is the next action. You can concentrate on just “sending out”. Therefore, since the user can separate and perform the two actions, the user can surely wash his / her hand without wondering the position to send out. On the other hand, each action of the hand washing device 10 can be reliably detected by the detection unit 13, and water does not come out during use start or use, or water supply is not stopped.
As described above, when the user's actions are divided into two detection areas, the first detection area is used regardless of the posture and height of the person when using water in the second detection area b. Since it is sent out to the same height as a, a foam cap is attached so as to supply the water flow from the faucet device 1 in accordance with the washing position, or it corresponds to the position of the water receiving part 2 By making the area to be expanded and preventing the scattered water from jumping out of the water receiving part 2, the usability is further improved and the cleanliness can be maintained. In addition, the explanation has been made on the assumption that the hand-washing action has been performed so far, but the action of washing the toothbrush or drawing water into the cup is similar to whether each hand holding an object that wants to use water enters the first water supply area a. In the second detection area b, in order to identify the change in the water flow in the cup or the change in the water flow scattered on the toothbrush by the detection unit, it is necessary to determine whether the water discharge continues or stops according to the user's action. Can do. Furthermore, since the detection area is not only divided, but also after the detection in the first detection area, only the second detection area is used as the detection area. Since the user's hand will enter the second detection area without detecting it in the first detection area with respect to the act of taking out the object placed in the water receiving part, the state is shifted from the water stop state to the water supply state. Therefore, it is possible to provide a faucet device that is easy to use.

(Second embodiment)
FIG. 7A shows a schematic view of a second embodiment in which a hand-washing device is incorporated in a kitchen faucet device, and FIG. 7B shows a cross-sectional view taken along B in FIG.

  The kitchen faucet device 50 includes a hand-washing device 30, a cooking table 31, a stove (not shown), and a front panel 32. The hand-washing device 30 includes a faucet device 21 for supplying tap water, a water receiving unit 22 that receives water discharged from the water faucet device 21, and a user's hand or knife inside the water receiving unit 2. A radio wave sensor 23 for detecting that a detection object that is a cleaning object such as a cooking tool such as a cutting board has entered, a valve unit 24 for switching water discharged from the faucet device 21, and a radio wave sensor The control unit 25 is configured to control the on / off of the valve unit 24 based on a signal from the control unit 23. Here, the radio wave sensor 23 is installed outside the water receiving unit 22 and concealed below the cooking work table 31.

The hand-washing apparatus 30 has two detection areas, and the first detection area d is set in the vicinity of the radio wave sensor 23 on the cooking work table 31 side on the inner surface of the water receiving unit 22. e is set near the point where the trajectory of water discharged from the faucet device 21 intersects the overflow surface of the water receiving section.
As in the first embodiment, in the first detection area d, when an object to be cleaned such as a user's hand enters, the detection unit (not shown) of the radio wave sensor 23 places the valve unit 24 in the control unit 25. The area has a switch function in order to issue a command for opening and to discharge tap water from the faucet device 21. Since the first detection area d is on the wall surface of the water receiving section 22, it is convenient when the faucet device 21 is used across the water receiving section 22 from the front of the work table, and is received by the user. Even when standing in front of the water section, it is easy to use because the supply of tap water can be started without putting out a hand to the back of the water receiving section 22. In order to further improve usability, it is better to provide the markers 26 on the upper surface of the cooking work table 31 and the side surface 22a of the water receiving part 22 so that the user can easily put out his / her hand. If the marker 26 is a seal type that can be removed until the user gets used to it, the kitchen faucet device 50 may be simply configured, and the cooking work table 31 may be made of resin or glass. When formed of a material that transmits visible light, a light-emitting member such as an LED may be turned on to induce the user's cleaning action. The second detection area e is an area having an automatic water stop function for identifying whether to continue water supply from the faucet device 21 or to switch to water stop.

  The configuration of the radio wave sensor 23 and the control flow of the detection unit of the radio wave sensor 23 are omitted as in the first embodiment. In addition, the radio wave beam is reflected not only by the user's hand and water but also by metal materials, so it can be detected regardless of the color, shape, or material of cooking utensils such as kitchen knives, pans and pans. Even if you do not hold your hand over the first detection area d, you can supply tap water from the faucet device 21 just by holding the object to be cleaned, It can be operated from a place away from the faucet device 21 across the water receiving part 22 from the front of the table, which is convenient.

  Further, as in the first embodiment, the radio wave sensor 23 emits a radio wave beam from the end 22a of the water receiving unit 22 toward the faucet device 21, and therefore exists between the first and second detection areas. If a detected object is present in any of the water supply stop areas to be detected, it can be detected. However, when the faucet device 21 is stopped, only when the detected object in the first detection area d is detected, the valve unit. When the faucet device 21 supplies water, the water supply state continues only when the detected object in the second detectable area e is detected, and a plurality of detection areas are included in the radio wave beam. In the meantime, a water supply stop area can be realized, and the user can pick up what has been dropped in the water receiving part 22 or place a cooking utensil in the water receiving part 22 or do not want to give out water. Kitchen utensils and other utensils from the front Even when the act of cutting off the remaining water after washing is performed, the water stoppage is obtained by comparing the threshold value with the signal waveform from the frequency conversion unit or the signal waveform after passing through the high amplification unit as in the first embodiment. Therefore, it is possible to provide an easy-to-use hand-washing apparatus capable of controlling spout water at a timing according to a user's request for water.

It is a figure explaining a 1st Example. It is a block diagram of a radio wave sensor. It is a figure which shows the control flow of a detection part. It is a figure which shows the Doppler signal waveform obtained in a detection part. It is a figure which shows the Doppler signal waveform obtained in a detection part. It is a figure which shows the Doppler signal waveform obtained in a detection part. It is a figure which shows the Doppler signal waveform obtained in a detection part. It is a figure explaining a 2nd Example.

Explanation of symbols

1,21, faucet device 2,22, water receiving unit 3,23, radio wave sensor 4,24, valve unit 5,25, control unit 10,30, washing device oscillation circuit antenna detection unit mixer unit low amplification unit high amplification Frequency converter 50, kitchen faucet device

Claims (4)

A water discharge section for discharging tap water;
A valve unit for switching water discharge from the water discharge unit;
A water receiving portion for receiving tap water discharged from the water discharging portion;
An antenna that radiates radio waves and receives a reflected signal reflected by the object to be detected;
A detection unit that obtains information of the object to be detected by a reflected signal received by the antenna;
A control unit that controls opening and closing of the valve based on a detection signal output from the detection unit,
The antenna is disposed in the water receiving unit so as to radiate radio waves toward the water discharging unit,
The controller is
When the valve is closed, the valve is controlled to open and close based on the differential signal that has passed through the frequency filter of the first frequency band,
When the valve is in an open state, the valve is controlled to open and close based on a differential signal that has passed through a frequency filter in a second frequency band. The hand washing apparatus according to claim 1, wherein the frequency filter of the second frequency band is a filter having a higher frequency band than the frequency filter of the first frequency band. The controller is
Based on detection information obtained from two independent detection areas, the valve opening / closing control is performed based on the detection signal output from the detection unit,
The two detection areas are a first detection area for detecting a deceleration change of a user's hand approaching the water receiving part, and a second detection for detecting the speed of the water flow supplied from the water discharging part. The hand-washing apparatus according to claim 1, wherein the hand-washing apparatus comprises an area. 4. The detection unit according to claim 1, wherein the detection unit has a plurality of amplification factors, and the second detection area is determined with a larger amplification factor than the first detection area. The hand-washing apparatus according to item 1.

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