JP2019060152A - Sanitary equipment - Google Patents

Abstract

To provide the sanitary equipment capable of detecting human body with intention to use the sanitary equipment with higher accuracy.SOLUTION: The sanitary equipment of the present invention comprises: a radio wave sensor that acquires information on a detection target by a reflection wave of a radiated radio wave, and a control unit that controls an operation of equipment based on a detection signal including a first signal and a second signal output from the radio wave sensor, wherein the control unit has a phase angle calculation unit that calculates a phase angle based on the first signal and the second signal that have different phases and a determination unit that determines presence or absence of the detection target, and the determination unit determines the presence or absence of a detection target based on at least one or more signal amplitude values of the first signal and the second signal in a period in which a change of a predetermined angle occurs in the phase angle calculated by the phase angle calculation unit.SELECTED DRAWING: Figure 3

Description

  Aspects of the present invention relate generally to sanitary devices, and more particularly to toilet devices.

  There is a toilet apparatus provided with a radio wave sensor in order to detect a detection target in the toilet space. In patent document 1, detection using the electric wave sensor provided in the toilet apparatus, the technology of detecting the movement of the detection object from the phase difference information of the signal, and the technology of detecting the presence or absence of the detection object from the signal strength Control is disclosed. Specifically, when the entrance of the toilet room is in front of the toilet apparatus, the movement and presence of the human body are determined based on the phase difference information, and when the entrance is at the side of the toilet apparatus, based on the signal strength. Determine the presence of the human body.

  Here, in Patent Document 1, as a technique for detecting the movement of a detection target based on phase difference information, a user generates a wave of one cycle (that is, a change in the phase of the Doppler signal of 2π). It is disclosed that the wave number of the Doppler signal is counted to detect the movement distance of the user based on the fact that it is equal to moving by 2 (λ: wavelength of the transmission wave). Furthermore, by combining with the information on the moving direction, it is possible to accurately detect the moving distance of the user.

Patent No. 4482301

  For example, when the user of the toilet apparatus performs standing-up, it almost stands still in the standing posture. As described above, depending on the usage of the user in the toilet room, a large signal strength may not be obtained. Therefore, Patent Document 1 states that when the toilet seat of the toilet apparatus is opened, the user can be detected by enhancing the sensitivity of the radio wave sensor.

However, when the sensitivity is increased, the radio wave sensor detects people who do not intend to use around the toilet room, and it is detected that the human body is present even though the user has left the toilet room. There is a possibility of continuing.
For example, when the radio wave sensor detects that there is no human body in the presence of a human body, if the toilet device cleans the toilet bowl or closes the toilet lid, these operations will continue if detection of the human body continues. It does not happen.

  The present invention has been made based on the recognition of such problems, and an object of the present invention is to provide a sanitary device capable of detecting with high accuracy a human body intended to use the sanitary device.

  The first invention controls the operation of the appliance based on a detection signal including a radio wave sensor that acquires information on a detection target by a reflected wave of a radiated radio wave, and a first signal and a second signal output from the radio wave sensor. In a sanitary device including a control unit, the control unit calculates a phase angle based on first and second signals having different phases, a determination unit that determines the presence or absence of a detection target, And the determination unit determines whether or not the detection target is present based on at least one or more signal amplitude values of the first signal and the second signal in a period in which a change in the predetermined angle occurs in the phase angle calculated by the phase angle calculation unit. Is determined.

For example, since a wave of one cycle is obtained in a period in which the phase angle of the detection signal determined from the first signal and the second signal changes by 2π, the signal amplitude value in this period is measured to a value corresponding to the intensity of the reflected wave. Become.
Therefore, according to the first aspect of the invention configured as described above, since the change in the predetermined phase angle indicates the predetermined movement amount of the user, the signal amplitude value in the period in which the change in the predetermined phase angle occurs The signal amplitude value reflects the intensity of the reflected wave, and it is possible to detect and judge the approach / separation of the user and the position with high accuracy. In addition, when the movement of the user is small and a predetermined angle change does not occur in the phase angle, the presence or absence of the detection target is not determined, and thus it is not erroneously determined that there is no detection target.

  The second invention is the sanitary device according to the first invention, wherein the control unit stores the signal amplitude value and the amount of change of the phase angle, and the determination unit stores the stored signal amplitude value and the phase angle. The presence or absence of a detection target is determined based on the amount of change.

Here, when the user moves λ / 2 (λ: wavelength of the transmission wave), the change in the phase angle indicates the position of the user from the relationship that the phase angle changes by 2π.
Therefore, according to the second invention configured as described above, the change in the signal amplitude value and the phase angle calculated in advance is stored in the determination unit in the condition of the detected person in the relationship between the signal amplitude value and the change amount in the phase angle. By comparing the and with the stored numerical values, the user's detection and determination can be performed with high accuracy. In the case where the user approaches the sanitary device or when leaving the sanitary device, a characteristic relationship can be seen that the intensity of the reflected wave is larger as the user is closer to the radio wave sensor, so that the determination can be made with high accuracy.

  A third aspect of the invention is the sanitary device according to the first or second aspect of the invention, wherein the determination unit determines the removal of the detection target based on the signal amplitude value after the determination that the detection target is present.

Here, the sensitivity of the sensor that detects the signal amplitude value fluctuates depending on the use environment, physical size, and manufacturing variations, and there is a risk that an erroneous determination may be made if the signal amplitude value is compared with a fixed threshold to detect. is there.
However, according to the third aspect of the invention configured as described above, since the above configuration is determined based on the signal amplitude value by the actual user, the signal amplitude value at the time of approaching the sanitary device and in use, and Since the signal amplitude values at the time of leaving are correlated, the leaving can be determined with high accuracy.

  A fourth aspect of the invention is the sanitary device according to any one of the first to third aspects, wherein the determination unit determines presence or absence of the detection target when the change amount of the phase angle is larger than a stored threshold. It is to judge.

  According to the fourth aspect of the invention configured as described above, the amount of change of the phase angle is a value reflecting the amount of movement of the user, so the movement distance of the user is also used for the determination. In the direction of higher sensitivity in the sensitivity of the sensor, the change in the signal amplitude value due to the distance of the user is scarce, and considering the variation in sensor sensitivity due to the use environment and manufacturing variation, sufficient judgment performance is obtained with the signal amplitude value alone. Although it may not be possible, the determination accuracy can be improved because the determination is made when there is a movement of a predetermined distance by using the determination of the change amount of the phase angle together.

  A fifth aspect of the invention is the sanitary device according to any of the first to fourth aspects, wherein the control unit includes a high pass filter that removes low frequency components of the first signal and the second signal, A phase angle calculation unit is provided to calculate the phase angle based on the output of the high pass filter.

The first signal and the second signal have different output voltages due to variations in the characteristics of sensor components or differences in the phase of the reflected wave other than the detection target, and the phase angle calculation accuracy is affected by this effect. It will decrease.
However, according to the fifth aspect of the present invention configured as described above, the phase angle and the signal amplitude value are calculated based on the signal accompanying the movement of the detection target by removing the background potential (noise) by the high pass filter. Can be determined more accurately.

  A sixth aspect of the invention is the sanitary device according to any of the first to fifth aspects, wherein the radio wave sensor sets the maximum sensitivity direction upward or downward from horizontal.

  According to the sixth aspect of the invention, the difference between the signal amplitude values is easily made between the detection target of the use position of the device to be detected and the remote detection target not to be detected. Improve.

  ADVANTAGE OF THE INVENTION According to this invention, it is effective in the ability to detect with high precision the human body which has an intention of using a sanitation apparatus.

It is a perspective view showing the toilet bowl in which the toilet apparatus which concerns on this embodiment was provided. It is a block diagram showing the principal part composition of the toilet apparatus concerning this embodiment. It is a block diagram showing the principal part composition of the human body detection part concerning this embodiment. It is a figure which shows transition of the signal inside a human body detection part when a detection target approaches a human body detection part. It is a figure which shows transition of the signal inside a human body detection part when a detection target approaches a human body detection part. It is a figure which shows the concept of the calculation in a phase angle calculating part. It is a side view showing the mode at the time of using the toilet apparatus which concerns on this embodiment. It is a figure which shows the signal obtained by a control part. It is a figure which shows the relationship between the distance L of a sensor and a human body, and the signal amplitude value V of a sensor. It is a figure which shows the relationship between phase angle integration value _Stheta and amplitude value V2 ( _pi ). It is a figure which shows the setting method of the threshold value of the conditions which a user detects transition of amplitude value V2 ( _{pi) at} the time of using a toilet apparatus, and there is no human body. It is a figure which shows the example which a user detects and determines based on change of the signal at the time of using a toilet apparatus, and the change of a phase angle.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same components are denoted by the same reference numerals and the detailed description will be appropriately omitted.

FIG. 1 is a perspective view showing a toilet provided with a toilet apparatus according to the present embodiment.
FIG. 2 is a block diagram showing the main configuration of the toilet apparatus according to the present embodiment.

  As shown in FIG. 1, the toilet apparatus 1 according to the present embodiment is attached to a Western-style stool (simply referred to as a “commoder” for convenience of the following description) 6. The toilet apparatus 1 includes a toilet seat 2, a toilet lid 3, and a main body 4. The main body 4 is placed on the toilet bowl 6, and the toilet seat 2 and the toilet lid 3 are pivotally supported on the main body 4 so as to be openable and closable.

  Hereinafter, although the front-back direction is used for description of embodiment, this direction was seen from the user who sat down to the toilet seat 2. FIG.

  As shown in FIG. 2, the toilet apparatus 1 further includes a human body detection unit 10 provided inside the main body unit 4 and a controlled unit 20. The human body detection unit 10 includes a radio wave sensor 11 and a control unit 12.

  The radio wave sensor 11 radiates radio waves of high frequency such as microwaves or millimeter waves 25 degrees upward (not shown) in front of the horizontal of the toilet apparatus 1 and reflects waves from the detection object (human body) of the emitted radio waves To receive. The reflected wave contains information on the state of the detection target. The radio wave sensor 11 outputs a detection signal based on the radiated radio wave and the reflected wave to the control unit 12. The control unit 12 is a circuit including, for example, a microcomputer. Then, the control unit 12 detects the presence or absence of a human body based on the detection signal, and outputs a control signal to the controlled unit 20 based on the detection result.

The present invention is not limited to the example described above, and the radio wave sensor 11 may be configured to detect the presence or absence of a human body based on the detection signal and output the detection result to the control unit 12.
That is, the human body detection unit 10 emits a radio wave to obtain a detection signal, detects the presence or absence of a human body based on the detection signal, and outputs a control signal to the controlled unit 20 based on the detection result. If it is a thing, it is possible to change the detailed structure suitably.

  The controlled unit 20 includes, for example, a nozzle unit 21, a toilet seat opening / closing unit 22, a toilet lid opening / closing unit 23, a toilet bowl cleaning unit 24, a deodorizing unit 25, a hot air unit 26, and a toilet seat heating unit 27. .

  The nozzle unit 21 has a cleaning nozzle housed inside the main body 4 and a drive unit for driving the cleaning nozzle. The drive unit advances the washing nozzle into the bowl 6a of the toilet bowl 6 and retracts the bowl 6a. For example, when receiving the control signal from the control unit 12, the nozzle unit 21 causes the drive unit to advance the cleaning nozzle into the bowl 6a, and discharges the cleaning water from the cleaning nozzle toward the local part of the user.

  The toilet seat opening / closing unit 22 opens (raises) or closes (lowers) the toilet seat 2 based on a control signal from the control unit 12. The toilet lid opening / closing unit 23 opens (lifts) or closes (lowers) the toilet lid 3 based on a control signal from the control unit 12. The toilet bowl cleaning unit 24 cleans the bowl 6 a of the toilet bowl 6 based on the control signal from the control unit 12. The deodorizing unit 25 reduces the odor component by passing the air in the toilet room through a filter, a catalyst or the like based on the control signal from the control unit 12. The hot air unit 26 blows hot air toward the “buttocks” and the like of the user sitting on the toilet seat 2 based on a control signal from the control unit 12 to dry the same. The toilet seat heating unit 27 heats and warms the seating surface of the toilet seat 2 based on the control signal from the control unit 12.

  The above-described components included in the controlled unit 20 are an example. The controlled unit 20 may include only a part of the components described above. Alternatively, the controlled unit 20 may include other components that operate based on the control signal.

  In addition, the control unit 12 operates at least a part of the controlled unit 20 based on a signal input from the operation unit 5 such as a remote control or a signal such as a seating detection sensor provided on the toilet seat 2. Is also possible. Alternatively, here, the control unit outputs the control signal to the controlled unit 20 based on the detection result of the radio wave sensor 11, and outputs the control signal to the controlled unit 20 based on the input from the operation unit 5 or the like. Although the case where the control part to perform is the same thing is demonstrated, these control parts may be provided separately.

A more detailed configuration of the human body detection unit 10 and an internal signal accompanying the movement of the detection target will be described based on FIGS. 3 to 6.
FIG. 3 is a block diagram showing the main configuration of a human body detection unit according to the present embodiment.
FIGS. 4 and 5 are diagrams showing transitions of signals inside the human body detection unit when the detection target approaches the human body detection unit.
FIG. 6 is a diagram showing the concept of calculation in the phase angle calculation unit.

  The radio wave sensor 11 includes an oscillator 31 for generating a high frequency signal, a transmitter 32 (antenna), a receiver 33 (antenna), mixers 34 a and 34 b, and a phase shift unit 35. The radio wave sensor 11 is a sensor that outputs a detection signal S0 including an Ich signal and a Qch signal. In this example, the transmitting antenna and the receiving antenna are provided separately. However, the transmitting antenna and the receiving antenna may be common.

  Radio waves in a frequency band of 10 kHz to 100 GHz, such as high frequency waves, microwaves, or millimeter waves, are emitted from the transmission unit 32 connected to the oscillator 31. For example, a transmission wave T1 having a frequency of 10.50 to 10.55 GHz or 24.05 to 24.25 GHz is emitted toward the front of the toilet apparatus. The receiving unit 33 receives a reflected wave T2 from a detection target such as a human body.

  A part of the transmission wave (signal Sig1) and a part of the reception wave (signal Sig2) are input to the mixer unit 34a and synthesized. Thereby, the Ich signal is output.

  Further, a part of the reception wave (signal Sig3) is input to the phase shift means 35. The phase shift means 35 shifts the phase of the signal Sig3 and outputs a signal Sig4. As an example of the phase shift means 35, there is a method of changing the length and arrangement of the wiring for transmitting the received wave to the mixer unit 34b. The phase difference between the signal Sig4 and the signal Sig3 is, for example, 60 ° or more and 120 ° or less, and desirably as close as possible to 90 °. In this example, the phase difference between the signal Sig4 and the signal Sig3 is 90 ° (π / 2, quarter wavelength). A part of the transmission wave (signal Sig5) and the signal Sig4 are input to the mixer unit 34b and synthesized. Thereby, the Qch signal is output.

  The Ich signal and the Qch signal are input to the control unit 12, low frequency signals are removed by the high pass filters 36a and 36b, respectively, and amplified by the amplification circuits 37a and 37b to become signals Si and Sq. It is input to the determination unit 39.

  FIG. 4 shows the transition of the signal Si and the signal Sq when the detection target approaches the human body detection unit 10. Both Si and Sq are waveforms oscillating up and down around the reference voltage V0 of the high pass filter, and the phase of the Sq signal is shifted by 90 ° with respect to the phase of the Si signal. Therefore, the phase of the signal S0 can be obtained from the signal Si and the signal Sq in the phase angle calculation unit 38.

First, when a voltage obtained by subtracting the reference voltage V0 from the voltage value of the signal Si is Vi, and a voltage obtained by subtracting the reference voltage V0 from the signal Sq is Vq, Vi and Vq are as shown in FIG. For example, when the value of Vi is plotted on the horizontal axis and the value of Vq on the vertical axis as shown in FIG. 6, the phase θ1 at time t1 is the polar angle of the point P, and can be obtained by the following calculation it can.
θ1 = tan ⁻¹ (Vq1 / Vi1) (1)
Therefore, if the phase angle is appropriately calculated, the change can also be recognized.

Thus, the determination unit 39 can recognize, for example, a period (from point Q to point R) in which θ rotates from 0 to 1 on polar coordinates. This period is one cycle from time t2 in FIG. 5 to t3, the control unit 39, Vi during this period, calculates the V _{2 [pi} (the difference between the maximum value and the minimum value) the amplitude value of Vq. This reflects the amount of reflection at the detection target.

  Also, the change in phase occurs as the object to be detected moves. Since the output signal of the radio wave sensor is generated by the interference between the transmission wave and the reception wave, assuming that the wavelength of the radio wave emitted by the radio wave sensor is λ, the phase change of 2π means that the phase of the transmission wave and the reception wave is λ Since it changes, it corresponds to movement of the detection target by λ / 2. For example, when the frequency of the radio wave emitted by the radio wave sensor 11 is about 24 GHz, λ / 2 is about 6.2 mm. Therefore, the movement distance of the detection target can be calculated by obtaining the change in phase.

  The calculation of the phase angle is not limited to the above method. For example, whether the Vq turns from negative to positive or from positive to negative and whether or not Vi is positive or negative at that time is the detection target It is possible to recognize that the half cycle has elapsed, that is, the phase angle has changed by π while determining whether it has approached or departed.

Further, the period for obtaining the amplitude value may be 2π as described above, or may be a period during which the phase angle changes further.
In the above example, the amplitude value is the difference between the maximum value and the minimum value including both Vi and Vq in the period from t2 to t3. However, the difference between the maximum value and the minimum value is calculated for each of Vi and Vq The average value may be used, or one of Vi and Vq may be used.

Next, with reference to FIG. 7 and FIG. 8, the relationship between the mode when the toilet apparatus is used and the signal inside the control unit 12 at this time will be described.
FIG. 7 is a side view showing how the toilet apparatus according to the embodiment is used.
FIG. 8 is a diagram illustrating signals obtained by the control unit in the usage mode of FIG. 7.

In FIG. 8, the horizontal axis represents time, and the vertical axis represents the phase angle integrated value S _θ and the amplitude value V _2π .
Here, the phase angle integration value S _θ is obtained by integrating the number of times in the determination unit 39 each time the phase angle output from the phase angle calculation unit 38 changes by 2π. Here, when the detection target approaches the Doppler sensor 410, addition is performed, and when the detection target moves away from the Doppler sensor 410, subtraction is performed.

First, as shown in FIG. 7A, the user enters the toilet room TR through the door DR. User, since significant movement in a direction approaching to the radio wave sensor 11, as represented in a period P1 of FIG. 8, with S _theta increases, the amplitude value V _{2 [pi} is gradually increases with movement . At this time, for example, when the amplitude value V _2π exceeds the threshold value V _{ON_th} at t4, the human body detection unit 10 detects that there is a human body in the toilet room TR, and receives the control signal of the control unit 12 to receive the toilet lid 3 Can be opened.

Next, as shown in FIG. 7 (b), for example, the user opens the toilet seat 2 and performs standing stool. At this time, the user hardly moves. Therefore, as shown in period P2 of FIG. 8, the change in S _θ is small. However, since the user's body is slightly moving, the amplitude value V _2π is calculated when there is a change of 2π in the phase along with the small movement. At this time, since the user is at a position close to the radio wave sensor 11, the amplitude value is obtained as a large value.

Thereafter, as shown in FIG. 7C, the user exits the toilet room TR through the door DR. Since the user moves largely in the direction away from the radio wave sensor 11, S _θ decreases in the opposite direction to the period P1 as shown in the period P3 of FIG. _{When 2π} decreases and falls below the threshold V _{OFF_th} at t5, the human body detection unit 10 detects that there is no human body in the toilet room TR. Then, the toilet washing unit 24 is driven by the control unit 12 to wash the toilet 6 or the toilet seat opening / closing unit 22 or the toilet lid opening / closing unit 23 is driven to close the toilet seat 2 and the toilet lid 3.

Thus, as shown in FIG. 8, the amplitude value V _2π in the period in which there is a phase change of 2π even in the period P2 in which the user stands up is accurate because it reflects the position of the user. Can detect the user

In the determination unit 39, the relationship between the phase angle integrated value S _θ and the amplitude value V _2π can be added to the condition of the detection determination of the human body. The relationship between the distance L between the sensor and the human body and the signal amplitude value V of the sensor is as shown in FIG. Then, since the phase angle integrated value _Sθ has a correlation with the moving distance of the user, the relationship between the phase angle integrated value _Sθ and the amplitude value V _2π in the period P1 is as shown in FIG. The determination unit 39 previously acquires and stores the relationship between S _θ and V _2π in a predetermined angle range when using the toilet apparatus, and determines the presence or absence of a human body by comparing with this.

As the determination method, the derivative of the curve may be obtained and compared and determined, or various pattern identification methods may be used. Here, determination may be made with a normalized value by dividing the value of V _2π by the maximum value in this section. The sensitivity of the sensor fluctuates under the influence of body shape, use environment, manufacturing tolerance, etc., and thus is affected not a little, but it is also possible to suppress the influence.
These determinations can be similarly applied when leaving the user. As described above, the determination accuracy can be further improved by making the determination based on the feature of the relationship between the position at the time of use of the device and the amplitude value.

The accuracy can be further improved by appropriately changing the threshold of the condition under which the control unit 12 detects that there is no human body. FIG. 11 is a diagram showing a transition of the amplitude value V _2π when the user uses the toilet apparatus and a method of setting a threshold of a condition for detecting that there is no human body. Here, it is assumed that the maximum value of the amplitude value V _2π is always stored as Vmax (Max hold), and the threshold value is multiplied by a predetermined coefficient k. In FIG. 11, it is detected that there is no human body at time t6 when V _2π falls below Vmax × k. Since the sensitivity of the sensor fluctuates under the influence of body shape, operating environment, manufacturing tolerance, etc., the detection position may be different from the original design target position at a fixed threshold, but by doing so, Can be reduced.

The accuracy can be further improved by adding the amount of change of the phase angle integrated value S _θ to the determination condition of the presence or absence of the user in the control unit 12. FIG. 12 is a diagram showing an example of detection and determination based on the transition of the signal when the user uses the toilet apparatus and the change of the phase angle.
The example shows the case where the sensitivity of the sensor is low due to the influence of the environment. In a period P1 in which the user enters the toilet room TR through the door DR, the amplitude value V _2π increases but does not reach the threshold value V _{ON — th} . On the other hand, S _θ increases and at time t 7 it is detected that there is a human body in the toilet room TR exceeding the threshold value S _{θ ON_th} . Although the sensitivity of the sensor fluctuates under the influence of body shape, use environment, manufacturing tolerance, etc., this effect can be eliminated.

The embodiments of the present invention have been described above. However, the present invention is not limited to these descriptions. Those skilled in the art can appropriately modify the above-described embodiment as long as they have the features of the present invention and fall within the scope of the present invention. For example, it is not necessarily limited to a toilet apparatus as a sanitary device, and can be used for a urinal and a hand-washing machine.
Moreover, each element with which each embodiment mentioned above is equipped can be combined as much as technically possible, and what combined these is also included in the scope of the present invention as long as the feature of the present invention is included.

DESCRIPTION OF SYMBOLS 1 toilet apparatus, 2 toilet seat, 3 toilet lid, 4 main body part, 5 operation part, 6 toilet bowl, 6a bowl, 10 human body detection part, 11 radio wave sensor, 12 control parts, 20 controlled parts, 21 nozzle unit, 22 toilet seat opening and closing Unit, 23 toilet lid opening / closing unit, 24 toilet bowl cleaning unit, 25 deodorizing unit, 26 hot air unit, 27 toilet seat heating unit, 31 oscillator, 32 transmitter, 33 receiver, 34 mixer, 35 phase shift means, 36 high pass filter , 37 amplification circuit, 38 phase angle calculation unit, 39 judgment unit, DR door, TR toilet room

Claims (6)

A radio wave sensor for acquiring information on an object to be detected by a reflected wave of the radiated radio wave; and a control unit for controlling the operation of the appliance based on a detection signal including a first signal and a second signal output from the radio wave sensor. In the sanitary equipment provided,
A phase angle calculation unit that calculates a phase angle based on the first signal and the second signal that are different in phase from each other;
A determination unit that determines the presence or absence of the detection target;
The determination unit is a detection target based on at least one or more signal amplitude values of the first signal and the second signal in a period in which a change in a predetermined angle occurs in the phase angle calculated by the phase angle calculation unit. To determine the presence or absence of   The sanitary device according to claim 1, wherein the control unit stores the signal amplitude value and the amount of change in the phase angle, and the determination unit stores the stored signal amplitude value and the amount of change in the phase angle. It is characterized by judging the existence of the detection object based on it.   The sanitary device according to claim 1 or 2, wherein the determination unit determines withdrawal of the detection target based on the signal amplitude value after the determination that the detection target is present.   The sanitary device according to any one of claims 1 to 3, wherein the determination unit includes a determination unit that determines the presence or absence of the detection target when the change amount of the phase angle is larger than a stored threshold. It is characterized by   The sanitary equipment according to any one of claims 1 to 4, wherein the control unit includes a high pass filter that removes low frequency components of the first signal and the second signal, and the control unit is based on the output of the high pass filter. And a phase angle calculator for calculating the phase angle.   The sanitary device according to any one of claims 1 to 5, wherein the radio wave sensor sets the maximum sensitivity direction upward or downward than horizontal.

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