Patent Publication Number: US-10779693-B2

Title: Sanitary washing device

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2017-110389, filed on Jun. 2, 2017; the entire contents of which are incorporated herein by reference. 
     FIELD 
     Embodiments described herein relate generally to a sanitary washing device. 
     BACKGROUND 
     A sanitary washing device that includes a radio wave sensor detecting a user is known. For example, the entrance of the user into a toilet room, the exit of the user from the toilet room, the user standing in front of an open toilet seat (e.g., the user performing standing urination), etc., can be detected by the radio wave sensor. 
     The sanitary washing device can execute functions of the sanitary washing device based on the detection result of the radio wave sensor. For example, when the sanitary washing device detects the user entering the toilet room and approaching the toilet, the sanitary washing device automatically opens the toilet lid. Also, for example, when the sanitary washing device detects that the user has finished standing urination and has moved away from the toilet, the sanitary washing device automatically closes the toilet seat and/or the toilet lid, automatically flushes the toilet, etc. 
     The operation of the user standing in front of the open toilet seat is small compared to the operation of the user entering and exiting the toilet room. For example, the user that is performing standing urination substantially does not move in front of the toilet. Therefore, to detect the user standing in front of the open toilet seat such as a user performing standing urination, etc., it is desirable for the radio wave sensor to be able to detect a slight fluctuation of the user. 
     Therefore, a method may be considered in which the sensing sensitivity is increased by increasing the reception sensitivity of the radio wave of the radio wave sensor. However, if the sensitivity is increased, for example, the effects of noise caused by radio waves generated outside the sanitary washing device, reflected waves due to external devices, etc., become large. In such a case, there is a risk that the noise may be undesirably detected erroneously as the user. For example, there is a risk that the radio wave sensor may continue to erroneously detect that the user exists even though the user has moved away from the front of the toilet seat and has exited the toilet room. If such a misdetection occurs, it may not be possible to automatically close the toilet seat and/or the toilet lid, automatically flush the toilet, etc. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view illustrating a toilet device in which a sanitary washing device according to the embodiment is provided; 
         FIG. 2  is a plan view illustrating a part of the sanitary washing device according to the embodiment; 
         FIG. 3  is an exploded perspective view illustrating the radio wave sensor according to the embodiment; 
         FIG. 4  is a plan view illustrating a part of the sanitary washing device according to the embodiment; 
         FIG. 5  is a cross-sectional view illustrating a part of the sanitary washing device according to the embodiment; 
         FIG. 6A  and  FIG. 6B  are plan views illustrating a part of the sanitary washing device according to the embodiment; 
         FIG. 7  is a cross-sectional view illustrating a part of the sanitary washing device according to the embodiment; 
         FIG. 8  is a cross-sectional views illustrating the sanitary washing device according to the embodiment; and 
         FIG. 9  is a cross-sectional views illustrating the sanitary washing device according to the embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     A first invention is a sanitary washing device including a main part, a toilet seat, and a radio wave sensor, wherein the toilet seat is pivotally supported to be rotatable with respect to the main part; the radio wave sensor is provided in an interior of the main part and uses a radio wave to detect a user in front of the main part; a position of the radio wave sensor does not change in a state in which the toilet seat is open and a state in which the toilet seat is closed; in the state in which the toilet seat is closed, the user in front of the main part is detected by the radio wave sensor in a first region and a second region; the second region is higher than the first region; and in the state in which the toilet seat is open, the user in front of the main part is detected by the radio wave sensor in the first region without the user in front of the main part being detected by the radio wave sensor in the second region. 
     According to the sanitary washing device, in the state in which the toilet seat is open, the radio wave sensor does not detect the user in the second region positioned higher. In other words, in the state in which the toilet seat is open, the radio wave sensor does not receive the radio wave passing through the second region toward the radio wave sensor. Thereby, the noise that is caused by radio waves generated outside the sanitary washing device can be reduced. Because the radio wave is not radiated from the radio wave sensor into the second region in the state in which the toilet seat is open, the noise that is caused by the reflected wave due to the external device, etc., can be reduced. Accordingly, the misdetection can be suppressed. 
     A second invention is the sanitary washing device of the first invention, wherein a maximum directivity direction of the radio wave radiated from the radio wave sensor is oriented upward from a horizontal direction; and the maximum directivity direction passes below the toilet seat in the state in which the toilet seat is open. 
     According to the sanitary washing device, it is easy to reliably detect the user in front of the toilet seat because the maximum directivity direction passes below the toilet seat. Also, the radio wave that propagates above the maximum directivity direction is blocked by the toilet seat. Thereby, the noise that is caused by the radio wave propagating above the maximum directivity direction can be reduced. 
     A third invention is the sanitary washing device of the second invention, wherein the maximum directivity direction passes above the toilet seat in the state in which the toilet seat is closed. 
     According to the sanitary washing device, it is easy to reliably detect the user even in the state in which the toilet seat is closed because the maximum directivity direction passes above the toilet seat. 
     Embodiments of the invention will now be described with reference to the drawings. Similar components in the drawings are marked with the same reference numerals; and a detailed description is omitted as appropriate. 
       FIG. 1  is a perspective view illustrating a toilet device in which a sanitary washing device according to the embodiment is provided. 
     The toilet device  200  includes the sanitary washing device  100  according to the embodiment and a western-style sit-down toilet (hereinbelow, called simply the “toilet”)  150 . The sanitary washing device  100  is mounted on the toilet  150 . 
     The sanitary washing device  100  includes a toilet seat  10 , a toilet lid  15 , and a main part  20 . The main part  20  is provided at the rear of the toilet seat  10  and the toilet lid  15 . The toilet seat  10  and the toilet lid  15  each are pivotally supported to be rotatable with respect to the main part  20 .  FIG. 1  shows the state in which the toilet seat  10  is closed (the lowered state) and the state in which the toilet lid  15  is open (the raised state). 
     In the description of this specification, the directions of “up,” “down,” “front,” “rear,” “right,” “left,” etc., are used. These directions are directions when viewed by a user seated on the toilet seat  10  in the closed state. 
     The main part  20  includes a casing  21  (a housing) and includes, in the interior of the casing  21 , a private part washing function of washing a private part (e.g., the “bottom,” etc.) of the user, a drying function of drying a private part of the user by blowing warm air, an electric opening/closing function of using electric power to open and close the toilet seat  10  and the toilet lid  15 , etc. 
       FIG. 2  is a plan view illustrating a part of the sanitary washing device according to the embodiment. 
       FIG. 2  schematically shows the interior of the casing  21  of the main part  20 . The toilet seat  10  is shown by the broken line. As shown in  FIG. 2 , a warm water heater  30 , a control circuit  32 , a first nozzle  34 , a nozzle motor  35 , a second nozzle  36 , a flow channel switching unit  38 , an air supply unit  40 , a toilet seat opening/closing part  50 , a toilet lid opening/closing part  60 , a radio wave sensor  70 , etc., are provided in the interior of the main part  20 . 
     The control circuit  32  includes a microcomputer, etc. The control circuit  32  controls the operations of a solenoid valve  23 , the warm water heater  30 , the nozzle motor  35 , the flow channel switching unit  38 , the air supply unit  40 , the toilet seat opening/closing part  50 , the toilet lid opening/closing part  60 , etc., based on signals from the radio wave sensor  70 , a remote control (not illustrated), etc. 
     Water is supplied to the main part  20  via a water supply part  22  from a water supply pipe  13  connected to a service water line, a water storage tank, etc. The solenoid valve  23  is provided on the downstream side of the water supply part  22 . The solenoid valve  23  switches between water shutoff and water supply downstream of the solenoid valve  23  based on a signal from the control circuit  32 . 
     The warm water heater  30  is provided downstream of the solenoid valve  23 . The warm water heater  30  heats the supplied water and converts the supplied water into warm water. The warm water heater  30  is, for example, an instantaneously-heating (instantaneous-type) heat exchanger that uses a ceramic heater, etc. A stored-hot-water heat exchanger that uses a hot water storage tank may be used. 
     The flow channel switching unit  38  is provided downstream of the warm water heater  30 . The flow channel switching unit  38  performs the switching and the opening and closing of the flow channels of water flowing toward the first nozzle  34 , the second nozzle  36 , and a nozzle wash chamber  39 . In the example, the flow channel switching unit  38  functions also as a flow regulation unit that adjusts the flow rate downstream of the flow channel switching unit  38 . However, the flow channel switching unit and the flow rate switch unit may be provided separately. 
     The first nozzle  34 , the nozzle wash chamber  39 , and the second nozzle  36  are provided downstream of the flow channel switching unit  38 . 
     The first nozzle  34  receives a drive force from the nozzle motor  35 , can advance into a bowl  151  of the toilet  150 , and can retract into the interior of the casing  21 . That is, the nozzle motor  35  can cause the first nozzle  34  to advance and retract based on a signal from the control circuit  32 . 
     Multiple water discharge ports  34   e  (referring to  FIG. 6B ) are provided in the tip of the first nozzle  34 . The multiple water discharge ports  34   e  include a bottom wash water discharge port used for a bottom wash, a bidet wash water discharge port used for a bidet wash, etc. Multiple flow channels (a bottom wash flow channel and a bidet wash flow channel) that guide the water to the multiple water discharge ports  34   e  are provided downstream of the flow channel switching unit  38 . 
     The first nozzle  34  in the state of being advanced from the casing  21  can wash a private part (e.g., the “bottom,” etc.) of the user seated on the toilet seat  10  by discharging, from one of the water discharge ports  34   e , the water supplied from the flow channel switching unit  38 . The water discharge port  34   e  that performs the water discharge is switched by the flow channel switching unit  38  switching the flow channel. For example, the water is discharged from the bottom wash water discharge port by the flow channel switching unit  38  switching the flow channel to the bottom wash flow channel; and the water is discharged from the bidet wash water discharge port by the flow channel switching unit  38  switching the flow channel to the bidet wash flow channel. 
     Also, a flow channel (a surface cleaning flow channel) that guides the water to the nozzle wash chamber  39  is provided downstream of the flow channel switching unit  38 . The water is supplied to the nozzle wash chamber  39  by the flow channel switching unit  38  switching the flow channel to the surface cleaning flow channel. The nozzle wash chamber  39  washes the outer circumferential surface (the central body) of the first nozzle  34  by spraying water from a water discharger provided in the interior of the nozzle wash chamber  39 . 
     Also, a flow channel (a spray flow channel) that guides the water to the second nozzle  36  is provided downstream of the flow channel switching unit  38 . The water is supplied to the second nozzle  36  by the flow channel switching unit  38  switching the flow channel to the spray flow channel. The second nozzle  36  discharges the supplied water in a mist-like form toward the interior of the bowl  151  of the toilet  150 . 
     The toilet seat opening/closing part  50  includes a rotation shaft  51  that pivotally supports the toilet seat  10 . Also, a mechanism (a motor, a gear, etc.) that engages the rotation shaft  51  is provided in the interior of the toilet seat opening/closing part  50 . The motor that is in the interior of the toilet seat opening/closing part  50  can open and close the toilet seat  10  by operating based on a signal from the control circuit  32 . 
     Similarly, the toilet lid opening/closing part  60  includes a rotation shaft  61  that pivotally supports the toilet lid  15 . Also, a mechanism (a motor, a gear, etc.) that engages the rotation shaft  61  is provided in the interior of the toilet lid opening/closing part  60 . The motor that is in the interior of the toilet lid opening/closing part  60  can open and close the toilet lid  15  by operating based on a signal from the control circuit  32 . 
     A fan and/or a heater is provided in the interior of the air supply unit  40 . The fan blows air onto a private part of the user seated on the toilet seat  10 . The heater warms the air forced through the interior of the air supply unit  40  by the fan. Thereby, warm air can be blown toward the private part of the user. 
     A metal member  10   a  (referring to  FIG. 1  or the like) is provided in the interior of the toilet seat  10  as a heater for warming the seating surface. The metal member  10   a  is provided along the periphery of the opening of the toilet seat. When the user is seated on the toilet seat  10 , the toilet seat  10  is warmed by providing a flow of current to the metal member  10   a . For example, a tubing heater, a sheathed heater, a halogen heater, a carbon heater, or the like is used as the heater provided in the toilet seat  10 . The metal member  10   a  includes, for example, aluminum, copper, etc. Various configurations such as a sheet configuration, a wire configuration, a mesh configuration, etc., may be employed as the configuration of the metal member  10   a.    
       FIG. 3  is an exploded perspective view illustrating the radio wave sensor according to the embodiment. 
     The radio wave sensor  70  is, for example, a doppler sensor utilizing the doppler effect. In the example, the radio wave sensor  70  includes a radio wave transmitter/receiver  72  and a controller  74 . 
     The radio wave transmitter/receiver  72  includes, for example, a circuit and detects the detection object (the user) by radiating a high frequency radio wave such as a microwave, a millimeter wave, or the like, and receives the reflected wave from the detection object. Information that relates to the state of the detection object is included in the reflected wave. 
     The controller  74  is a circuit board in which a control circuit such as a microcomputer or the like is formed; and the controller  74  includes a metal (e.g., copper, aluminum, etc.). The controller  74  determines the state of the detection object based on the radio wave radiated by the radio wave transmitter/receiver and the reflected wave received by the radio wave transmitter/receiver  72  and outputs, to the control circuit  32 , a signal relating to the determination result (i.e., the detection result of the radio wave sensor  70 ). Based on this signal, the control circuit  32  opens and closes the toilet seat  10 , opens and closes the toilet lid  15 , flushes the toilet  150 , heats the toilet seat  10 , performs the operation control of the first nozzle  34  (the nozzle motor  35 ), performs the operation control of the flow channel switching unit  38 , etc. 
     In this specification, the range of the “state of the detection object” determined by the controller  74  includes at least one of the presence or absence of the detection object or the movement (whether or not there is movement, the movement direction, the speed, etc.) of the detection object. The range of the “state of the detection object” may include not only the user approaching and moving away but also being seated and rising. 
     The radio wave transmitter/receiver  72  is mounted to be connected to the controller  74 . The radio wave transmitter/receiver  72  and the controller  74  are stored inside a case  76  as one module. The radio wave sensor  70  is fixed inside the casing  21  of the main part  20 . The position and the orientation of the radio wave sensor  70  do not change between the state in which the toilet seat  10  and the toilet lid  15  are open and the state in which the toilet seat  10  and the toilet lid  15  are closed. That is, the direction (the maximum directivity direction) in which the radio wave is radiated from the radio wave sensor  70  does not change even when the toilet seat  10  and/or the toilet lid  15  are opened and closed. 
     The maximum directivity direction of the radio wave means the direction in which a maximum value occurs in the intensity distribution of the radiated radio wave. In the embodiment, a maximum directivity direction D of the radio wave radiated from the radio wave sensor  70  (referring to  FIG. 5 ) is a direction toward the front and is oriented upward from the horizontal direction. In the case where a radio wave that has maximum values in multiple directions is radiated from the radio wave sensor  70 , it is sufficient for at least one of the multiple directions to be tilted toward the upper side of the horizontal direction. 
     As shown in  FIG. 2 , the radio wave sensor  70  is disposed above the air supply unit  40 . The radio wave sensor  70  is positioned further frontward than the toilet lid opening/closing part  60  and is positioned further rearward than the toilet seat opening/closing part  50 . 
     The configuration of the water system (the flow channels of the water, the warm water heater  30 , etc.) and the control circuit  32  are provided on the right of the first nozzle  34 ; and the configuration of the air supply system (the air supply unit  40 , a deodorizing unit (not illustrated), etc.), the toilet seat opening/closing part  50 , and the toilet lid opening/closing part  60  are provided on the left of the first nozzle  34 . The radio wave sensor  70  is provided on the side opposite to the configuration of the water system when viewed from the first nozzle  34 . Thereby, the reflecting or the blocking of the radio wave from the radio wave sensor  70  by the water can be suppressed; and the obstruction of the transmission and reception of the radio wave can be suppressed. Also, the effects on the radio wave sensor  70  of the electromagnetic noise emitted by the control circuit  32  can be suppressed. 
       FIG. 4  is a plan view illustrating a part of the sanitary washing device according to the embodiment. 
       FIG. 5  is a cross-sectional view illustrating a part of the sanitary washing device according to the embodiment. 
       FIG. 4  shows an enlarged vicinity of the radio wave sensor  70 .  FIG. 5  shows a cross section along line A-A shown in  FIG. 4 . The toilet seat opening/closing part  50  is positioned at the front of the toilet lid opening/closing part  60 . As shown in  FIG. 4 , the toilet seat opening/closing part  50  includes a motor  52 , a gear  53 , and a spring  54  in the interior of the toilet seat opening/closing part  50 . Similarly, the toilet lid opening/closing part  60  includes a motor  62 , a gear  63 , and a spring  64  in the interior of the toilet lid opening/closing part  60 . The toilet seat opening/closing part  50  and the toilet lid opening/closing part  60  each include a metal. That is, the motors, the gears, and the springs each may include metal members. The metal may be any metal such as aluminum, copper, etc. Also, a resin, etc., may be included in a part of the motors, the gears, and the springs. 
     As shown in  FIG. 5 , the height (the position in the up/down direction) of at least a part of the radio wave sensor  70  is substantially the same as the height of at least a part of the toilet lid opening/closing part  60 . In other words, at least a part of the radio wave sensor  70  overlaps at least a part of the toilet lid opening/closing part  60  in the horizontal direction. In other words, when viewed from the side as in  FIG. 5 , at least a part of the radio wave sensor  70  is disposed within the area of the toilet lid opening/closing part  60  projected frontward. 
     As described above, the radio wave sensor  70  radiates the radio wave mainly toward the front. There are cases where a part of the radio wave radiated frontward from the radio wave sensor  70  is reflected by the main part  20  and/or the toilet seat  10  and undesirably returns rearward. Therefore, the detection accuracy of the radio wave sensor  70  frontward may decrease. Here, the toilet seat opening/closing part  50  and the toilet lid opening/closing part  60  include a metal. Therefore, the toilet seat opening/closing part  50  and the toilet lid opening/closing part  60  reflect the radio wave. In the embodiment, by arranging the toilet lid opening/closing part  60  and the radio wave sensor  70  as described above, a part of the radio wave radiated frontward from the radio wave sensor  70  and returned rearward is reflected frontward by the toilet lid opening/closing part  60 . That is, a part of the radio wave returned rearward is again returned frontward. Thereby, the decrease of the detection accuracy can be suppressed because the radio wave can be caused to propagate frontward of the main part with a minimum loss. 
     The height of at least a part of the radio wave sensor  70  is substantially the same as the height of at least a part of the toilet seat opening/closing part  50 . In other words, at least a part of the radio wave sensor  70  overlaps at least a part of the toilet seat opening/closing part  50  in the horizontal direction. In other words, at least a part of the radio wave sensor  70  is disposed within the area of the toilet seat opening/closing part  50  projected rearward when viewed from the side as in  FIG. 5 . 
     The toilet seat opening/closing part  50  is provided at a position that is lower than the toilet lid opening/closing part  60 . That is, an upper end  50 U of the toilet seat opening/closing part  50  is positioned lower than an upper end  60 U of the toilet lid opening/closing part  60 . Thereby, the obstruction by the toilet seat opening/closing part  50  of the propagation of the radio wave radiated from the radio wave sensor  70  and reflected frontward by the toilet lid opening/closing part  60  can be suppressed. Thereby, the user can be detected more efficiently. 
     As shown in  FIG. 4 , the position of the radio wave sensor  70  is shifted in the left/right direction with respect to the positions of the toilet seat opening/closing part  50  and the toilet lid opening/closing part  60 . In other words, at least a part of the radio wave sensor  70  does not overlap the toilet seat opening/closing part  50  and the toilet lid opening/closing part  60  in the frontward/rearward direction when viewed from above. In the example, the radio wave transmitter/receiver  72  of the radio wave sensor  70  is disposed further rightward than the toilet seat opening/closing part  50  and the toilet lid opening/closing part  60 . Thus, by shifting in the left/right direction, the obstruction by the radio wave sensor  70  itself of the frontward propagation of the radio wave radiated from the radio wave sensor  70  and reflected by the toilet lid opening/closing part  60  can be suppressed. 
     In the state in which the toilet seat  10  is closed as shown in  FIG. 4  and  FIG. 5 , a circuit board  41  is provided between the toilet seat  10  and the radio wave sensor  70 . In the example, the circuit board  41  is a circuit that controls the operation of the heater of the air supply unit  40  based on the signal from the control circuit  32  of the main part  20 . The circuit board  41  includes a metal member. The metal member may be any metal such as aluminum, copper, etc. 
     For example, if the arrangement of the radio wave sensor is inappropriate, there are cases where the radio wave that is radiated from the radio wave transmitter/receiver is blocked, reflected, or refracted by a member (a resin or a metal member of the heater) of the sanitary washing device; thereby, the radio wave does not propagate easily toward the user. Therefore, there is a risk that the accuracy of detecting the user may decrease. In particular, the propagation of the radio wave radiated from the radio wave sensor may be obstructed by the resin forming the toilet seat and/or the metal heater provided in the interior of the toilet seat in the case where the toilet seat is positioned at the front of the radio wave sensor. 
     Conversely, in the embodiment as shown in  FIG. 4  and  FIG. 5 , the circuit board  41  that includes the metal member is positioned between the toilet seat  10  and the radio wave sensor  70  (the radio wave transmitter/receiver  72 ) at the rear part of the toilet seat  10 . The circuit board  41  is disposed at the vicinity of the radio wave sensor  70  so that the circuit board  41  reflects the radio wave radiated from the radio wave sensor  70  and propagating toward the toilet seat  10  in the state in which the toilet seat  10  is closed. Thereby, the obstruction by the toilet seat  10  of the propagation of the radio wave radiated from the radio wave sensor  70  can be suppressed. 
     More specifically, as shown in  FIG. 5 , the upper part (an edge part  41   f  at the front) of the circuit board  41  is disposed to overlap the lower part of the radio wave sensor  70  in the frontward/rearward direction. An edge part  41   r  at the rear of the circuit board  41  is disposed not to overlap the lower part of the radio wave sensor  70  in the frontward/rearward direction. That is, the circuit board  41  is disposed to be tilted with respect to the frontward/rearward direction. 
     The maximum directivity direction D of the radio wave radiated from the radio wave sensor is oriented upward from the horizontal direction. The maximum directivity direction D passes above the circuit board  41 . For example, an upper surface  41 U of the circuit board  41  is disposed to be aligned with the maximum directivity direction D. The state of the upper surface  41 U being aligned with the maximum directivity direction D is a state in which the angle between the upper surface  41 U and the maximum directivity direction D is, for example, 10° or less. In the example shown in  FIG. 5 , the upper surface  41 U is parallel to the maximum directivity direction D. The upper surface  41 U is the major surface of the substrate where the circuit is formed. 
     By such an arrangement, the radio wave that is radiated in the maximum directivity direction D from the radio wave sensor  70  can propagate without being incident on the circuit board  41 . Also, because the radio wave that is radiated downward from the horizontal direction from the radio wave sensor  70  is reflected upward and frontward by the circuit board  41 , the radio wave does not propagate downward easily and is not easily incident on the toilet seat  10 . Thereby, the radio wave is caused to propagate more easily toward the user; and the decrease of the detection accuracy can be suppressed. 
     As shown in  FIG. 5 , a part  10   r  at the rear part of the toilet seat  10  overlaps the lower part of the radio wave sensor  70  and the edge part  41   r  at the rear of the circuit board  41  in the frontward/rearward direction in the state in which the toilet seat  10  is closed. Also, the maximum directivity direction D passes above the toilet seat  10 . Thereby, the radio wave that is radiated in the maximum directivity direction D from the radio wave sensor  70  is not incident on the toilet seat  10 . Accordingly, the radio wave propagates easily toward the user; and the decrease of the detection accuracy can be suppressed. 
     As in a toilet seat  10 A shown by the single dot-dash line in  FIG. 5 , the toilet seat may be provided to be relatively lower than the circuit board  41  so that the extension line (an extension plane F) of the upper surface  41 U of the circuit board  41  does not cross the toilet seat  10 . Thereby, the incidence on the toilet seat  10 A of the radio wave radiated from the radio wave sensor  70  and reflected by the circuit board  41  is suppressed. The radio wave propagates easily toward the user; and the decrease of the detection accuracy can be suppressed. 
       FIG. 6A  and  FIG. 6B  are plan views illustrating a part of the sanitary washing device according to the embodiment. 
       FIG. 7  is a cross-sectional view illustrating a part of the sanitary washing device according to the embodiment. 
       FIG. 6A  and  FIG. 6B  show an enlarged vicinity of the first nozzle  34 .  FIG. 6A  is the state in which the first nozzle  34  is contracted and stored inside the casing  21  of the main part  20 .  FIG. 6B  is the state in which the first nozzle  34  is elongated and advanced from the casing  21  of the main part  20 . 
       FIG. 7  shows a cross section along line B-B shown in  FIG. 6A . Some of the components are not illustrated in  FIG. 7  for easier viewing. 
     The main part  20  includes multiple first nozzle hoses  37 . The first nozzle hoses  37  each are connected to the first nozzle  34  and the flow channel switching unit  38  and supply the water from the flow channel switching unit  38  to the first nozzle  34 . The multiple first nozzle hoses  37  are multiple flow channels (the bottom wash flow channel and the bidet wash flow channel) that guide the water to the multiple water discharge ports  34   e.    
     The main part  20  includes a second nozzle hose  33 . The second nozzle hose  33  is connected to the second nozzle  36  and the flow channel switching unit  38  and supplies the water from the flow channel switching unit  38  to the second nozzle  36 . The second nozzle hose  33  is the spray flow channel that guides the water to the second nozzle  36 . 
     The flow channel switching unit  38  includes a rotor  38   a  having multiple holes through which the water passes, and a motor  38   b  that rotates the rotor  38   a . The hole through which the water passes is switched by rotating the rotor  38   a  by an operation of the motor  38   b . Thereby, the flow channel switching unit  38  can switch the flow channel of the water flowing toward the first nozzle  34  or the second nozzle  36 . That is, the flow channel switching unit  38  selects the hose among the multiple first nozzle hoses  37  and the second nozzle hose  33  through which the water is caused to flow. For example, the flow channel switching unit  38  can switch between the state in which the water flows into the first nozzle  34  (the first nozzle hoses  37 ) and the state in which the water flows into the second nozzle  36  (the second nozzle hose  33 ) by the operation of the motor  38   b.    
       FIG. 8  and  FIG. 9  are cross-sectional views illustrating the sanitary washing device according to the embodiment. 
       FIG. 8  illustrates the state in which the toilet seat  10  is closed; and  FIG. 9  illustrates the state in which the toilet seat  10  is open. The toilet lid  15  is in the open state in  FIG. 8  and  FIG. 9 . 
     In the state in which the toilet seat  10  is closed as shown in  FIG. 8 , the maximum directivity direction D of a radio wave TW radiated from the radio wave sensor  70  passes above the toilet seat  10 . In the state in which the toilet seat  10  is closed, the radio wave TW is radiated in a range including a first region R 1 , and a second region R 2  that is higher than the first region R 1 . Thereby, the radio wave sensor  70  can detect the user existing in at least one of the first region R 1  or the second region R 2 . The first region R 1  is, for example, a part of the region that is lower than the maximum directivity direction D. The second region R 2  is, for example, a part of the region that is higher than the maximum directivity direction D. 
     In the state in which the toilet seat  10  is open as shown in  FIG. 9 , the maximum directivity direction D passes below the toilet seat  10 . 
     The toilet lid  15 , the contour of the toilet seat  10 , and the casing  21  of the main part  20  include materials such as resins, etc., that easily transmit radio waves. On the other hand, a metal (e.g., the metal member  10   a  in the toilet seat  10  interior or the like) reflects radio waves without transmitting. Therefore, the radio wave that passes below the toilet seat  10  propagates frontward as-is; but a part of the radio wave incident on the toilet seat  10  is reflected by the metal member  10   a  and does not propagate frontward. As a result, in the state in which the toilet seat  10  is open, the radio wave TW is radiated in the first region R 1  but is not radiated in the second region R 2  shown in  FIG. 8 . 
     In other words, the first region R 1  is a region where the propagation of the radio wave TW is not obstructed by the toilet seat  10 ; and the second region R 2  is a region where the propagation of the radio wave TW is blocked by the open toilet seat  10 . In the state in which the toilet seat  10  is open, the user that is in front of the main part  20  is not detected in the second region R 2  by the radio wave sensor; and the user that is in front of the main part  20  is detected in the first region R 1  by the radio wave sensor. On the other hand, in the state in which the toilet seat  10  is closed, the user that is in front of the main part  20  is detected in the first region R 1  and the second region R 2  by the radio wave sensor  70 . 
     A faint radio wave may be radiated in the second region R 2 . In other words, here, the radio wave not being radiated in the second region R 2  includes the case where a faint radio wave that is insufficient to detect a human body is radiated in the second region R 2  in addition to the case where no radio waves are radiated in the second region R 2 . 
     Generally, the operation of the user standing in front of the open toilet seat is small compared to the operation of the user entering and exiting the toilet room. For example, the user that is performing standing urination substantially does not move in front of the toilet. Therefore, there are cases where the detecting of the standing urination operation of the user is relatively difficult. If the movement of the user performing standing urination cannot be detected, there is a risk that it may be detected that the use of the toilet device has ended even though the user is performing standing urination. In the case where the toilet device receives the detection result and flushes the toilet, opens and closes the toilet seat, etc., if there is such a misdetection, there is a possibility that the toilet may be flushed or the toilet seat and/or the toilet lid may be closed while standing urination is being performed. To detect the user performing standing urination, it is desirable for the radio wave sensor to be able to detect a slight fluctuation of the user. 
     Therefore, a method may be considered in which the sensing sensitivity is increased by increasing the reception sensitivity of the radio wave of the radio wave sensor. However, if the sensitivity is increased, there is a risk that the effects of the noise also may become large; and misdetection undesirably may occur easily. If the radio wave sensor is undesirably affected by the noise, a misdetection that the user exists in front of the toilet may occur even though the user does not exist in front of the toilet; and there is a possibility that the toilet may not be flushed or the toilet seat and/or the toilet lid may not be closed even when the user has moved away from the front of the toilet. 
     For example, there are cases where the radio wave that is radiated from the radio wave sensor is reflected by an external device (e.g., a fluorescent lamp, a ventilation fan, etc.) positioned higher; and the reflected wave passes through the second region R 2  toward the radio wave sensor. Such a reflected wave may cause noise when detecting the user. Also, for example, in the second region R 2  that is positioned higher, radio waves other than the reflected wave of the radio wave radiated from the radio wave sensor (e.g., radio waves generated outside the sanitary washing device such as by a mobile telephone or the like held by a person standing in front of the toilet) easily propagate toward the radio wave sensor. Such a radio wave generated outside also may cause noise when detecting the user. Because the operation of the user standing in front of the open toilet seat is relatively small, the effects of noise become large when the toilet seat is open. Therefore, when the toilet seat is open, if the radio wave sensor is affected by noise such as that described above, the misdetection described above occurs relatively easily. 
     Conversely, in the embodiment, in the state in which the toilet seat  10  is open, the radio wave sensor  70  does not detect the user in the second region R 2  positioned higher. In other words, in the state in which the toilet seat is open, the radio wave sensor  70  does not receive the radio wave passing through the second region R 2  toward the radio wave sensor  70 . Thereby, the noise that is caused by radio waves other than the reflected wave and is generated outside the sanitary washing device can be reduced. Also, because the radio wave that is radiated upward from the radio wave sensor  70  is blocked by the toilet seat  10  in the state in which the toilet seat  10  is open, the noise that is caused by a reflected wave due to an external device or the like positioned higher can be reduced. Accordingly, the misdetection can be suppressed. 
     On the other hand, the radio wave sensor  70  detects relatively large operations such as the entrance and exit of the user, etc., in the state in which the toilet seat  10  is closed. Therefore, the effects of the noise when the toilet seat  10  is closed are small compared to when the toilet seat  10  is open. Therefore, in the state in which the toilet seat  10  is closed, the radio wave sensor radiates the radio wave in the first region R 1  and the second region R 2  and detects the user in a wider range. 
     If the radio wave that is radiated from the radio wave sensor toward the maximum directivity direction is incident on the toilet seat, there is a risk that the detection accuracy may decrease due to the radio wave being reflected. Conversely, in the embodiment, the maximum directivity direction D passes below the toilet seat  10  in the state in which the toilet seat  10  is open; and the maximum directivity direction D passes above the toilet seat  10  in the state in which the toilet seat  10  is closed. Thereby, in the state in which the toilet seat  10  is open and in the state in which the toilet seat  10  is closed as well, it is easy to reliably detect the user that is in front of the toilet seat  10 . Also, in the state in which the toilet seat is open, the radio wave that propagates above the maximum directivity direction D is blocked by the toilet seat  10 . Thereby, the noise that is caused by the radio wave propagating above the maximum directivity direction D can be reduced. 
     For example, the radio wave sensor  70  is disposed more proximal to the toilet seat opening/closing part  50  than to the toilet lid opening/closing part  60 . For example, as shown in  FIG. 4 , a distance L 1  between the radio wave sensor  70  and the toilet seat opening/closing part  50  is shorter than a distance L 2  between the radio wave sensor  70  and the toilet lid opening/closing part  60 . Also, for example, a distance L 3  between the radio wave transmitter/receiver  72  and the toilet seat opening/closing part  50  is shorter than a distance L 4  between the radio wave transmitter/receiver  72  and the toilet lid opening/closing part  60 . Thus, by disposing the radio wave sensor  70  in a position proximal to the toilet seat opening/closing part  50 , i.e., a position proximal to the toilet seat  10 , the region can be narrow where the radio wave from the radio wave sensor  70  is blocked by the toilet seat  10  in the state in which the toilet seat  10  is open. 
     The embodiments of the invention have been described above. However, the invention is not limited to the above description. Those skilled in the art can appropriately modify the above embodiments, and such modifications are also encompassed within the scope of the invention as long as they include the features of the invention. For instance, the shape, dimension, material, arrangement, installation configuration and the like of various components in the sanitary washing device  100 , the toilet device  200  and the like are not limited to those illustrated, but can be modified appropriately. 
     Furthermore, various components in the above embodiments can be combined with each other as long as technically feasible. Such combinations are also encompassed within the scope of the invention as long as they include the features of the invention.