JP2012211485A - Automatic faucet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optimum automatic faucet for achieving power saving without impairing user-friendliness by selecting the detecting performance of each of detecting sensors in accordance with the detecting priority of the plurality of detecting sensors.SOLUTION: The automatic faucet comprises: a faucet body for discharging hot water; a solenoid valve for selecting water discharge or water stop from the faucet body; the plurality of detecting sensors provided for detecting an object; and a controller for selecting the state of the solenoid valve, based on the detecting states of the plurality of detecting sensors, the controller having a sensor driving part for individually driving the plurality of detecting sensors, sensor detecting state determining parts for determining the detecting states of the plurality of detecting sensors, a faucet driving part for controlling the opening/closing of the solenoid valve, based on the determination results of the plurality of sensor detecting state determining parts, a detection priority determining part for determining the priority of the plurality of detecting sensors, and a detecting performance selecting part for individually controlling the detecting performances of the plurality of detecting sensors, based on the determination result of the detection priority determining part.

Description

  An aspect of the present invention generally relates to an automatic faucet provided with a detection sensor, and more specifically, relates to an automatic faucet that automatically discharges and stops water according to the detection status of the detection sensor.

  In an automatic faucet having a detection sensor, the sensing cycle is shortened while the detection sensor is detecting, and a short sensing cycle is continued for a predetermined time even after the detection sensor is not detected. A control method that lengthens the sensing cycle is known (see, for example, Patent Document 1).

  Even if the detection sensor is not detected, it is likely to be used again immediately after the non-detection. On the other hand, according to the control method described above, usability can be improved by keeping the sensing cycle short even immediately after non-detection. Further, power saving can be achieved by extending the sensing cycle after a predetermined period.

  On the other hand, there is an automatic faucet provided with a plurality of detection sensors in order to accurately detect various usages of the automatic faucet. For example, when two detection sensors are provided, it is conceivable that the other sensor is also detected while water is discharged by the detection of one of the detection sensors. In such an automatic faucet, if both sensing sensors set the sensing cycle shortly immediately after using the automatic faucet, there is room for improvement from the viewpoint of power saving.

Japanese Patent Publication No. 3-58611

  The present invention has been made to solve the above-described problems, and can save power without impairing usability by switching the detection performance of each detection sensor according to the detection priority of a plurality of detection sensors. The objective is to provide an optimal automatic faucet.

  In order to achieve the above object, according to the first aspect of the present invention, there is provided a faucet body for discharging hot water, an electromagnetic valve for switching water discharge from the faucet body, and water stopping, and for detecting an object. A plurality of detection sensors, and a control unit that switches a state of the solenoid valve based on detection states of the plurality of detection sensors, wherein the control unit individually sets the plurality of detection sensors. A sensor drive unit for driving the sensor, a sensor detection state determination unit for determining detection states of the plurality of detection sensors, and water for controlling opening and closing of the electromagnetic valve based on the determination results of the plurality of sensor detection state determination units. Detection that individually controls the detection performance of the plurality of detection sensors based on the determination results of the stopper driving unit, the detection priority determination unit that determines the priority of the plurality of detection sensors, and the detection priority determination unit Out of performance Automatic faucet is provided, characterized in that it has a section, the.

  As a result, the detection performance of each of the plurality of detection sensors can be individually controlled based on the priority set by the detection priority determination unit. The state of a certain object can be detected quickly, while a sensor with a low priority can be detected with a long period, thereby saving power without impairing usability.

  According to a second aspect of the present invention, in the first aspect of the invention, the detection performance switching unit detects the object based on the determination result of the detection priority determination unit. It is characterized by switching the detection performance during each time.

  As a result, the detection performance while the detection sensor is detecting an object such as a user's hand is switched based on the determination of the detection priority determination unit. Even when another detection sensor detects during the process, the detection performance of the other detection sensor is not increased, and power saving can be achieved.

  According to a third aspect of the present invention, in the second aspect of the invention, the detection priority determination unit determines the priority according to a detection order of the plurality of detection sensors.

  As a result, even if an object such as a user's hand enters only the detection range of one of the detection sensors, the state of the object can be detected quickly, and the other detection sensor can detect it with a long period of time. Electricity can be achieved.

  According to a fourth aspect of the present invention, in the second aspect of the invention, the detection priority determination unit determines the priority based on a detection frequency at which the plurality of detection sensors detect an object. Yes.

  As a result, even when the user's hand is close to one of the detection sensors, the detection priority determination unit can reliably set the priority of the detection sensor, while obtaining an excellent usability as an automatic faucet. However, it is possible to reduce power consumption.

  According to a fifth aspect of the present invention, in the first aspect of the invention, the detection performance switching unit is in a state in which the plurality of detection sensors do not detect an object based on a determination result of the detection priority determination unit. It is characterized by switching the detection performance.

  Thereby, optimal detection performance can be set while suppressing power consumption during standby until the detection sensor detects an object such as a user's hand.

  According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the detection priority determination unit determines the priority based on past detection states of the plurality of detection sensors.

  As a result, an object such as a user can be detected quickly in a time segment with a high usage frequency, and power can be saved by detecting the detection sensor with a long cycle in a time segment with a low usage frequency. .

  According to a seventh aspect of the invention, in the fifth aspect of the invention, the detection priority determination unit determines the priority based on a predetermined priority.

  As a result, it is possible to set optimal detection performance in a series of movements of the user and to save power.

  According to the invention of claim 8, in the invention of claim 1, the detection performance switching unit is in a state in which the plurality of detection sensors do not detect an object based on the determination result of the detection priority determination unit. Then, the detection performance for a predetermined time is switched.

  Thereby, even when it is used again immediately after water stoppage, the state of the object can be detected quickly, and the other detection sensor can detect power with a long cycle, thereby saving power.

  According to a ninth aspect of the invention, in the eighth aspect of the invention, the detection priority determination unit determines the priority based on a detection state while the plurality of detection sensors are detecting an object. It is characterized by that.

  As a result, by setting the priority of the detection sensor according to the detection state during water discharge, it is possible to set the optimum detection performance in a series of user movements and to save power. It becomes possible.

  According to the invention of claim 10, in the invention of claim 1, the detection performance switching unit has a detection performance for a predetermined time after the plurality of detection sensors are not detecting an object, and The detection performance after a predetermined time has elapsed since the plurality of detection sensors are not detecting an object is switched based on different determination results of the detection priority determination unit.

  This reduces power consumption during standby until the detection sensor detects an object such as a user's hand, and saves usability even if the automatic faucet is suddenly used. Electricity can be achieved.

  According to the present invention, power saving can be achieved without impairing usability.

It is a perspective schematic diagram which illustrates the washstand provided with the automatic faucet concerning embodiment of this invention. It is a block diagram which illustrates an automatic faucet concerning an embodiment of the invention. It is a schematic diagram which illustrates the operation panel concerning embodiment of this invention. It is a time chart which shows operation | movement of the automatic water tap concerning 1st Embodiment. It is a time chart which shows operation | movement of the automatic water tap concerning 2nd Embodiment. It is a time chart which shows operation | movement of the automatic water tap concerning 3rd and 6th embodiment. It is a time chart which shows operation | movement of the automatic faucet concerning 4th Embodiment. It is a time chart which shows operation | movement of the automatic faucet concerning 5th Embodiment.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, in each drawing, the same code | symbol is attached | subjected to the same component and detailed description is abbreviate | omitted suitably.

FIG. 1 is a schematic perspective view illustrating a wash basin provided with an automatic faucet according to an embodiment of the present invention.
FIG. 2 is a block diagram illustrating an automatic faucet according to an embodiment of the present invention.

As shown in FIG. 1, the washstand 1 includes an automatic faucet 2 according to an embodiment of the present invention and a bowl portion 6 that receives hot water discharged from the faucet body 3.
As shown in FIGS. 1 and 2, the automatic faucet 2 includes a faucet body 3, an electromagnetic valve 70, a water supply source 90, a water supply hose 100, a plurality of detection sensors SR1, SR2,. A mode changeover switch 41 and a control unit 80 are provided. The control unit 80 includes a sensor drive unit 81, a sensor detection state determination unit 82, a detection priority determination unit 83, a detection performance switching unit 84, and a faucet drive unit 85.

  In the washstand 1 shown in FIG. 1, two detection sensors SR1 and SR2 are provided as detection sensors for the automatic faucet 2. However, this embodiment also includes what has three or more detection sensors. In the following description, the plurality of detection sensors SR1, SR2,..., SRn are collectively referred to as detection sensors SR.

  In FIG. 2, for convenience, the control unit 80 and the detection sensor SR are represented as separate bodies. However, in the present embodiment, the control unit 80 and the detection sensor SR may be integrated, or the detection sensor SR. A part of the function of the control unit 80 may be provided on the side.

As shown in FIG. 2, water or hot water is supplied from the water supply source 90, and water or hot water is discharged from the water outlet of the faucet body 3 through the electromagnetic valve 70 connected to the water supply hose 100. .
In the present embodiment, water discharged from the faucet body 3 includes not only water or hot water but also cleaning liquid.

  The solenoid valve 70 switches hot water sent from the water supply source 90 between water discharge from the water outlet of the faucet body 3 and water stoppage. The electromagnetic valve 70 opens and closes the valve based on an electric signal sent from the faucet driving unit 85 to switch water discharge and water stop.

The detection sensor SR has a detection area AR1 and a detection area AR2 so as to detect the presence or absence of an object such as a user's hand that is provided near the faucet body 3.
The detection sensor SR is a sensor called a reflection type integral sensor having an infrared light projecting element 50 and a light receiving element 51, for example. The type of sensor is not limited to this, and may be appropriately changed to a microwave method, an ultrasonic method, a distance measuring method, a pyroelectric sensor, or the like.

The sensor driving unit 81 performs control to project light from the light projecting elements 50 of the plurality of detection sensors SR based on the electrical signal output from the detection performance switching unit 84. The light projected from the light projecting element 50 of the detection sensor SR is reflected by, for example, the bowl 6 or the user's hand, and the light receiving element 51 receives the reflected light.
Note that the amount of light projected from the light projecting element 50 of the detection sensor SR may be varied depending on the installation environment of the detection sensor SR and the change over time of the detection sensor SR.

  As described above, the sensor detection state determination unit 82 compares the level of the reflected light received by the light receiving element 51 with a preset threshold value, and determines that there is an object if it is equal to or greater than the threshold value. If there is, it is determined that there is no object, and the detection result is output to the faucet drive unit 85 and the detection priority determination unit 83 as an electrical signal.

The faucet drive unit 85 opens and closes the electromagnetic valve 70 based on the electrical signal output from the sensor detection state determination unit 82 as described above, and further, based on the electrical signal output from the mode switch 41. However, the electromagnetic valve 70 is opened and closed.
At that time, when the electrical signal from the mode switch 41 and the electrical signal from the sensor detection state determination unit 82 are output to the faucet drive unit 85 at approximately the same timing, the electrical signal from the mode switch 41 is given priority. And control.

The detection priority determination unit 83 is set in advance from each detection state of the detection sensor SR based on a predetermined priority or based on an electric signal output from the sensor detection state determination unit 82. Each priority of the detection sensor SR is determined according to the determination condition, and is output to the detection performance switching unit 84 as an electrical signal.
The priority determination condition of the detection priority determination unit 83 is basically determined based on the latest detection state and the past detection state of each detection sensor SR.
However, the detection priority determination unit 83 gives priority to the electrical signal from the mode switch 41 when detecting the output from the mode switch 41.

  Based on the electrical signal output from the detection priority determination unit 83, the detection performance switching unit 84 supplies each sensing cycle of the detection sensor SR and the timing for switching to the sensing cycle as an electrical signal to the sensor driving unit 81. Output.

  In addition, the sensor drive part 81, the sensor detection state judgment part 82, the faucet drive part 85, the detection priority judgment part 83, and the detection performance switching part 84 can each be comprised as an independent control circuit. Alternatively, a program for executing some or all of these elements may be executed by a CPU (Central Processing Unit).

FIG. 3 is a schematic view illustrating the operation panel according to the embodiment of the invention.
As shown in FIG. 3, the mode changeover switch 41 is provided, for example, on the operation panel 40 (see FIG. 1).
In the present embodiment, the push button type mode change switch 41 is exemplified as the mode change operation unit. However, the present invention is not limited to this, and a slide type switch, a dial type switch, a capacitance sensor type switch, etc. You may change suitably.

Each time the mode changeover switch 41 is pressed, the water discharge mode from the water discharge port of the faucet body 3 is alternately switched between the automatic water discharge mode and the continuous water discharge mode.
The automatic water discharge mode is a mode in which water can be discharged from the water discharge port based on the detection status of the detection sensor SR. The continuous water discharge mode is a mode in which water can be discharged from the water discharge port regardless of the detection state of the detection sensor SR. More specifically, in the automatic water discharge mode, as described above, when the detection sensor SR detects an object, the electromagnetic valve 70 is driven to open to discharge water, and when it is not detected, the electromagnetic valve 70 is driven to close to stop water. In the continuous water discharge mode, when the mode is entered, the electromagnetic valve 70 is driven to open and water is discharged. When the mode is exited, the electromagnetic valve 70 is driven to close and water is stopped.
Note that, during the continuous water discharge mode, all the detection sensors SR stop functioning.

Hereinafter, specific examples of the present embodiment will be described with reference to the drawings.
(First embodiment)
FIG. 4 is a time chart showing the operation of the automatic faucet 2 according to the first embodiment.

The time chart shown in FIG. 4 shows the sensing cycle that defines the detection performance of the two detection sensors SR1 and SR2, the detection signal, and the opening / closing timing of the solenoid valve.
In FIG. 4, from time t1 to t2, the automatic water tap 2 is in a standby state. In this state, both detection sensors SR1 and SR2 intermittently repeat the detection operation at the sensing cycle A1. That is, the sensor driving unit 81 (see FIG. 2) intermittently executes control for projecting light from the light projecting elements 50 of the detection sensors SR1 and SR2. The sensing period A1 can be set to 2 Hz (Hertz), for example. Each light projecting operation executed in the sensing cycle A1 may include a plurality of light projecting pulses. For example, each of the light projection operations executed at intervals of 2 Hz may include three light projection pulses.

  Returning to FIG. 4 again and continuing the description, when the user approaches the automatic faucet 2 and the user's hand or the like enters the detection area AR1 (see FIG. 1) at time t2, the detection sensor SR1 detects this. To do. That is, the sensor detection state determination unit 82 (see FIG. 2) determines the level of reflected light received by the light receiving element 51 of the detection sensor SR1, and determines that there is an object. Then, on the basis of the output from the sensor detection state determination unit 82, the faucet driving unit 85 performs control to open the electromagnetic valve 70.

At this time, the detection sensor SR2 has not detected yet. That is, the user's hand or the like does not enter the detection area AR2.
In the case of the specific example shown in FIG. 4, the user's hand or the like is in the detection range AR1 of the detection sensor SR1 until time t3 thereafter. That is, the detection sensor SR1 maintains a state where an object is detected.

  On the other hand, at time t7, the user's hand or the like also enters the detection area AR2. That is, the user's hand or the like enters the common part of the two detection areas AR1 and AR2 (see FIG. 1). This corresponds to, for example, a case where the user puts out his hand while approaching the automatic faucet 2 from the left side (see FIG. 1). At this time, when the detection sensor SR1 on the left side first detects the user's hand and then the user's hand approaches the front surface of the automatic water tap 2, the detection sensor SR2 also detects an object (time). t7).

  Thereafter, at time t8, the detection sensor SR2 does not detect the object, and at time t3, the detection sensor SR1 does not detect the object. This corresponds to, for example, a case where the user's hand has moved to the left from the front of the automatic faucet 2.

  As described above, in the case of the specific example shown in FIG. 4, the detection sensor SR1 first detects an object at time t2, and then the detection sensor SR2 detects an object at time t7.

  In the present embodiment, in the automatic faucet 2 including the two detection sensors SR1 and SR2, the priority of any of the detection sensors SR1 and SR2 is set high. In the specific example shown in FIG. 4, the detection priority determination unit 83 (FIG. 2) sets the priority of the detection sensor SR1 higher than the priority of the detection sensor SR2.

The detection performance switching unit 84 (FIG. 2) sets the sensing cycle of the detection sensor SR1 to be shorter than the sensing cycle of the detection sensor SR2 in response to the detection priority determination unit 83 setting the priority of the detection sensor SR1 high. To do. The sensor driving unit 81 (FIG. 2) drives the detection sensors SR1 and SR2 based on the sensing cycle set by the detection performance switching unit 84.
In the specific example shown in FIG. 4, priority is given to the detection performance of the detection sensor SR1. The sensing cycle B1 within the time period (t2 to t3) from when the detection sensor SR1 with high priority detects an object until it does not detect the object is detected after the detection sensor SR2 with low priority detects the object. The cycle is shorter than the sensing cycle B2 within the time until non-detection (t7 to t8). For example, the sensing period B1 can be 8 Hz, and the sensing period B2 can be 4 Hz.

  The sensor with high priority (detection sensor SR1) can obtain an effect that an object to be detected can be quickly detected in a short cycle. In the case of the specific example shown in FIG. 4, by setting the sensing cycle in a state where the detection sensor SR1 is detecting an object, for example, when the user performs an operation of grasping his / her hand from the detection area AR1, Corresponding to this, it is possible to quickly shift to a state where no object is detected, and to quickly stop water. As a result, good response and excellent usability are obtained, and the water saving effect is also improved. On the other hand, since the sensor (detection sensor SR2) having a low priority is detected at a long cycle, an effect of suppressing power consumption can be obtained.

  That is, the detection performance of each of the two detection sensors can be individually controlled based on the priority set by the detection priority determination unit 83, and a sensor with a high priority is subject to detection. The state of a certain object can be detected quickly, while the low-priority sensor (detection sensor SR2) detects at a long cycle, so that power saving can be achieved without impairing usability.

In this way, the detection performance while the detection sensor is detecting an object such as a user's hand is switched based on the determination of the detection priority determination unit. Even when another detection sensor detects while discharging water, the detection performance of the other detection sensor is not increased, and power saving can be achieved.
Although FIG. 4 shows a specific example in which the priority of the detection sensor SR1 is increased, the present invention is not limited to this, and the priority of the detection sensor SR2 may be increased.

  Further, as a method of determining the priority, as shown in the specific example shown in FIG. 4, the priority of the sensor detected first (detection sensor SR1 in FIG. 4) among the two detection sensors may be increased. .

  In this way, for example, when the user's hand enters only the detection area AR1 from the left and performs the act of washing only the left hand, the detection sensor SR1 detects more frequently than the detection sensor SR2, so the detection is performed first. By increasing the priority of the sensor, it is possible to quickly detect the state of the object that is the object of detection, while the low priority sensor detects it with a long period of time, thereby reducing power consumption without impairing usability. You can plan.

  In this way, even if an object such as a user's hand enters only the detection range of one of the detection sensors, the state of the object can be detected quickly, and the other detection sensor can detect it with a long cycle, Power saving can be achieved.

As shown in FIG. 4, when the detection sensor SR1 enters a state where no object is detected at time t3, both the detection sensors SR1 and SR2 shift to a standby state, and the detection operation is intermittently repeated at the sensing cycle A1.
(Second Embodiment)
The basic configuration of the automatic faucet 2 according to the second embodiment can be the same as that described with reference to FIGS.

FIG. 5 is a time chart showing the operation of the automatic water faucet according to the second embodiment.
In the time chart shown in FIG. 5, the sensing cycle, which is the detection performance of the two detection sensors SR1 and SR2, the detection signal, and the opening / closing timing of the solenoid valve are shown.

  In the first embodiment described above, the detection performance during detection of the detection sensor SR is based on a predetermined priority or based on the order in which the detection sensor SR detects an object such as a user's hand. Is switched. On the other hand, in the second embodiment, the detection performance during detection of the detection sensor SR is switched based on the detection frequency during a predetermined time T after detection by the detection sensor SR.

  The time chart illustrated in FIG. 5 is different from the time chart illustrated in FIG. 4 in the operations of the two detection sensors SR1 and SR2 during water discharge (electromagnetic valve opening). Since other operations can be the same as those in the first embodiment, a detailed description thereof will be omitted.

When the user's hand or the like is in the detection area AR1 at time t2, the detection sensor SR1 detects that the sensor detection state determination unit 82 determines that there is an object, and the faucet driving unit 85 causes the solenoid valve 70 to be turned on. Open and start watering.
At the same time, when the sensor detection state determination unit 82 determines that there is an object, the detection priority determination unit 83 starts measuring the detection time of the detection sensor SR1 (the time during which the object is continuously detected).

Thereafter, at time t7, the detection sensor SR2 detects the user's hand and the like, and at the same time, the detection priority determination unit 83 starts measuring the detection time of the detection sensor SR2 (the time during which the object is continuously detected). .
Then, when the predetermined time T has elapsed from the start of water discharge (time t2), the detection priority determination unit 83 compares the detection time of the detection sensor SR1 with the detection time of the detection sensor SR2 (time t3-t2, t8). -T7). As a result of comparison, since the detection time of the detection sensor SR1 is long, the detection priority determination unit 83 sets the priority of the detection sensor SR1 high. That is, among the two detection sensors, the priority of the detection sensor having the longer total time for detecting the object is set higher.
Then, the detection performance switching unit 84 reduces the sensing period of the low-priority detection sensor SR2 from 8 Hz to 4 Hz, and continues its operation until the sensor detection state determination unit 82 determines that there is no object (from time t8 to t9). Until).

  As in the first embodiment, the user's hand moves in this series by inserting his hand toward the automatic faucet 2 from the left side and moving to the front as it is to wash his hands. This corresponds to the case where the hand is pulled out from the left side.

  In the present embodiment, in the automatic faucet provided with the two detection sensors SR1 and SR2 as described above, the priority of one of the detection sensors SR1 and SR2 is set based on the detection frequency at which the detection sensor detects an object. Set high. In the case of the specific example shown in FIG. 5, the continuous detection time (the time during which the object is continuously detected) in the period of the predetermined time T is used as the detection frequency determination criterion. However, the present invention is not limited to this. In addition, the total detection time (total time during which an object is detected) and the number of detections in the period of the predetermined time T may be used as the determination criteria for the detection frequency.

As described above, by setting the priority based on the detection frequency, for example, even when the user's hand is close to one of the detection sensors, the priority can be accurately determined.
In other words, if the position of the user's hand, etc. is close to one of the detection sensors, it is possible to detect the user's hand etc. only within the detection area range of the detection sensor on the close side. Become.
In addition, which detection sensor the user's hand is approaching can be determined within a predetermined time after the start of water discharge, and the detection frequency of the two detection sensors can be used as the determination criterion. It is valid.

In this way, even when the user's hand is close to one of the detection sensors, the detection priority determination unit can reliably set the priority of the detection sensor and obtain an excellent usability as an automatic faucet. However, it is possible to reduce power consumption.
As shown in FIG. 5, after the water stoppage (solenoid valve closed), both the detection sensors SR1 and SR2 shift to the standby state, and the detection operation is repeated intermittently at the sensing cycles A1 and A2.
(Third embodiment)
Since the basic configuration of the automatic faucet 2 according to the third embodiment can be the same as that described with reference to FIGS. 1 to 3, the detailed description thereof is omitted.

FIG. 6 is a time chart showing the operation of the automatic faucet according to the third embodiment.
In the time chart shown in FIG. 6, the sensing cycle, which is the detection performance of the two detection sensors SR1 and SR2, the detection signal, and the opening / closing timing of the solenoid valve are shown.

  The time chart illustrated in FIG. 6 differs from the time charts of FIGS. 4 to 5 in the operation of the two detection sensors SR1 and SR2 at a predetermined time T after water stoppage (electromagnetic valve closing). Since other operations can be the same as those in the first embodiment, a detailed description thereof will be omitted.

  In the second embodiment described above, the detection performance during detection of the detection sensor SR is switched based on the detection frequency during a predetermined time T after the detection sensor SR detects an object such as a user's hand. In contrast, in the third embodiment, the detection performance of the detection sensor SR during a predetermined time T after water stoppage (solenoid valve closing) is switched based on the detection frequency during detection by the detection sensor SR.

As shown in FIG. 6, the detection sensor SR1 continues to detect an object such as a user's hand from time t2 to time t3. On the other hand, the detection sensor SR2 continues to detect an object such as a user's hand from time t7 to time 8. That is, the detection frequency of the detection sensor SR1 is higher than that of the detection sensor SR2. Then, as described above with reference to the second embodiment, the detection priority determination unit 83 sets the priority of the detection sensor SR1 high.
At time t8, the detection sensor SR2 is in a state where it does not detect an object such as a user's hand, and at time t3, the detection sensor SR1 is in a state where it does not detect an object. Then, the sensor detection state determination unit 82 determines that there is no object, and the faucet driving unit 85 closes the electromagnetic valve 70 and stops water based on the output from the sensor detection state determination unit 82. At the same time, based on the output from the sensor detection state determination unit 82, the detection priority determination unit 83 starts measuring time and sets the priority of the detection sensor SR1 high (until time t4 and time t9).

The detection performance switching unit 84 sets the sensing cycle of the high-priority detection sensor SR1 to be shorter than the sensing cycle of the detection sensor SR2. The sensor driving unit 81 drives the detection sensors SR1 and SR2 based on the sensing cycle set by the detection performance switching unit 84, respectively.
Thereafter, after a predetermined time T has elapsed (time t4 and time t9), the detection performance switching unit 84 sets the sensing cycle A1 of the detection sensor SR1 with high priority and the sensing cycle A2 of the detection sensor SR2 with low priority equal to each other. .

  In the specific example shown in FIG. 6, priority is given to the detection performance of detection sensor SR1 with high detection frequency after water stoppage. The sensing cycle C1 of the high-priority detection sensor SR1 within the predetermined time T after the water stop (electromagnetic valve closing) is within the predetermined time T after the low-priority detection sensor SR2 stops the water (electromagnetic valve closing). It is set shorter than the sensing cycle C2. For example, the sensing period C1 can be 3 Hz, and the sensing period C2 can be 1 Hz. Further, the sensing cycle A1 of the detection sensor SR1 and the sensing cycle A2 of the detection sensor SR2 after the predetermined time T has elapsed can be set to 2 Hz.

As in the first embodiment, the user's hand moves in this series by inserting his hand toward the automatic faucet 2 from the left side and moving to the front as it is to wash his hands. This corresponds to the case where the hand is pulled out from the left side.
That is, the detection sensor having a high priority can obtain an effect that the object to be detected can be quickly detected in a short period for a predetermined time T even after the water stoppage (solenoid valve closing).

  In the case of the specific example shown in FIG. 6, even when the detection sensor SR1 is not detecting an object such as a user's hand after the water stop (solenoid valve closed), by setting the sensing cycle short, For example, even if the user picks up his / her hand from the detection area AR1 and then immediately holds his / her hand over the detection area AR1, the user's hand is quickly detected correspondingly. The water can be discharged quickly. As a result, a good response and an excellent feeling of use can be obtained. On the other hand, since the sensor (detection sensor SR2) having a low priority is detected at a long cycle, an effect of suppressing power consumption can be obtained.

As described above, even when the apparatus is used again immediately after water stoppage, the state of the object can be quickly detected, and the other detection sensor can detect power with a long cycle, thereby saving power.
In addition, although the specific example which raises the priority of detection sensor SR1 was represented in FIG. 6, this invention is not limited to this, You may make the priority of detection sensor SR2 high.

Further, as another method for determining the priority after the water stoppage, as shown in the specific example shown in FIG. 6, the priority of the sensor detected first (detection sensor SR1 in FIG. 6) out of the two detection sensors. May be higher.
By doing this, for example, when a user pours water into a container such as a cup held in his left hand and rinses the mouth, the water may be poured again into the cup first. By increasing the priority of the detected sensor, it is possible to quickly detect the state of the object that is the object of detection, while the low priority sensor detects it with a long cycle, saving power without impairing usability Can be achieved.

  In this way, by setting the priority of the detection sensor according to the detection state during spitting, optimal detection performance can be set in a series of user movements, and power saving can be achieved. Is possible.

As shown in FIG. 6, after the water stoppage (solenoid valve closed), after a predetermined time T has elapsed, both the detection sensors SR1 and SR2 shift to the standby state and are detected intermittently at the sensing cycles A1 and A2. Repeat the operation.
(Fourth embodiment)
The basic configuration of the automatic faucet 2 according to the fourth embodiment can be the same as that described with reference to FIGS.

FIG. 7 is a time chart showing the operation of the automatic faucet according to the fourth embodiment.
In the time chart shown in FIG. 7, the sensing cycle, which is the detection performance of the two detection sensors SR1 and SR2, the detection signal, and the opening / closing timing of the electromagnetic valve are shown.

  Compared with the time charts of FIGS. 4 to 6, the time chart illustrated in FIG. 7 includes operations before the two detection sensors SR <b> 1 and SR <b> 2 detect an object such as a user's hand, and two detection sensors SR <b> 1. The operation after SR2 detects an object such as a user's hand is different. Since other operations can be the same as those in the first embodiment, a detailed description thereof will be omitted.

  In the above-described third embodiment, detection during a predetermined time T after water stoppage (electromagnetic valve closing) based on the detection frequency while the detection sensor SR is detecting an object such as a user's hand. The detection performance of the sensor SR is switched. On the other hand, in the fourth embodiment, the priority of the detection sensor in the non-detection state or the standby state is switched according to the detection frequency such as the past number of detections or the total detection time every predetermined time.

In the specific example shown in FIG. 7, the non-detection state or standby priority of the detection sensors SR1 and SR2 is switched every predetermined time T1, T2, and Tn.
That is, at time tT1, the detection priority determination unit 83 starts measuring the predetermined time T1. At the same time, the detection priority determination unit 83 sets the priority of the detection sensor SR1 high. The detection performance switching unit 84 sets the sensing cycle A1 of the detection sensor SR1 having a high priority to be shorter than the sensing cycle A2 of the detection sensor SR2. For example, the sensing period A1 can be 3 Hz, and the sensing period A2 can be 1 Hz.

The sensor driving unit 81 drives the detection sensors SR1 and SR2 based on the sensing cycle set by the detection performance switching unit 84, respectively.
In the specific example shown in FIG. 7, the detection sensor SR1 detects an object such as a user's hand before the detection priority determination unit 83 finishes measuring the predetermined time T1 (time tT2), and discharges water (solenoid valve). (Time t2).
At time t <b> 2, the sensor detection state determination unit 82 determines that the detection sensor SR <b> 1 has an object such as a user's hand, and outputs it to the faucet driving unit 85 and the detection priority determination unit 83.

The faucet drive unit 85 opens the electromagnetic valve 70 based on the input from the sensor detection state determination unit 82 to discharge water. At the same time, the detection priority determination unit 83 changes the priority of the detection sensor SR1 based on the input from the sensor detection state determination unit 82.
Based on the input from the detection priority determination unit 83, the detection performance switching unit 84 sets the sensing cycle B1 of the detection sensor SR1 to be higher than the sensing cycle A1 before the detection sensor SR1 detects an object such as a user's hand. Set it short.

  Similarly, at time t7, when the detection sensor SR2 detects the sensor detection state determination unit 82, the detection priority determination unit 83 changes the priority of the detection sensor SR2 based on the input from the sensor detection state determination unit 82. To do. Based on the input from the detection priority determination unit 83, the detection performance switching unit 84 sets the sensing cycle B2 of the detection sensor SR2 to be shorter than the sensing cycle A2 before the detection sensor SR2 detects the object.

  In the specific example shown in FIG. 7, the sensing cycle B1 when the detection sensor SR1 is detecting an object is equal to the sensing cycle B2 when the detection sensor SR2 is detecting an object. For example, the sensing period B1 and the sensing period B2 are 8 Hz. Here, for the sake of convenience, the sensing cycle B1 and the sensing cycle B2 are assumed to be equal. However, as in the above-described embodiment, the detection sensor that has detected the sensing cycle of the detection sensor detected earlier among the two detection sensors later. It may be set shorter than the sensing cycle.

  Subsequently, at time t <b> 8, the sensor detection state determination unit 82 determines that the detection sensor SR <b> 2 is free of an object such as a user's hand, and outputs the detection priority determination unit 83. The detection priority determination unit 83 determines whether the time t8 is within the predetermined time T1, and if it is within the predetermined time T1, outputs the priority of the detection sensor SR2 at the predetermined time T1 to the detection performance switching unit 84. That is, the priority of the non-detection state (standby state) at the predetermined time T1 is determined in advance, and the detection priority determination unit 83 determines the priority of the detection sensor SR2 based on this.

  Based on the output from the detection priority determination unit 83, the detection performance switching unit 84 sets the sensing cycle A2 before the detection sensor SR2 determines that there is an object such as a user's hand (that is, the non-detection state or the standby state). Set.

  Similarly, at time t <b> 3, the sensor detection state determination unit 82 determines that the detection sensor SR <b> 1 is free of an object such as a user's hand and outputs the detection priority determination unit 83. The detection priority determination unit 83 determines whether the time t3 is within the predetermined time T1, and if it is within the predetermined time T1, outputs the priority of the detection sensor SR1 at the predetermined time T1 to the detection performance switching unit 84. That is, the priority of the non-detection state (standby state) at the predetermined time T1 is determined in advance, and the detection priority determination unit 83 determines the priority of the detection sensor SR1 based on this.

Based on the output from the detection priority determination unit 83, the detection performance switching unit 84 sets the sensing cycle A1 before the detection sensor SR1 determines that there is an object such as a user's hand (that is, the non-detection state or the standby state). Set.
The sensor driving unit 81 drives the detection sensors SR1 and SR2 based on the sensing cycle set by the detection performance switching unit 84, respectively.

  Thereafter, after the predetermined time T1 has elapsed (time tT2), the detection priority determination unit 83 starts measuring the predetermined time T2. At the same time, the detection priority determination unit 83 sets the priority of the detection sensor SR2 high. That is, in the specific example shown in FIG. 7, the priority in the non-detection state is set higher in the detection sensor SR1 at the predetermined time T1, and higher in the detection sensor SR2 at the predetermined time T2.

  The detection performance switching unit 84 sets the sensing cycle C2 of the detection sensor SR2 having a high priority to be shorter than the sensing cycle C1 of the detection sensor SR1. For example, the sensing period C2 can be 3 Hz, and the sensing period C1 can be 1 Hz.

The sensor driving unit 81 drives the detection sensors SR1 and SR2 based on the sensing cycle set by the detection performance switching unit 84, respectively.
Thereafter, after the predetermined time T2 has elapsed (time tTn), the detection priority determination unit 83 starts measuring the predetermined time Tn. At the same time, the detection priority determination unit 83 sets the priorities of the detection sensors SR1 and SR2 to be equal. That is, in the specific example shown in FIG. 7, the priority in the non-detection state is set to the same level in the detection sensors SR1 and SR2 during the predetermined time Tn.

The detection performance switching unit 84 sets the sensing cycle n1 of the detection sensor SR1 and the sensing cycle n2 of the detection sensor SR2 to be equal. For example, the sensing cycle n1 and the sensing cycle n2 can be set to 2 Hz.
The sensor driving unit 81 drives the detection sensors SR1 and SR2 based on the sensing cycle set by the detection performance switching unit 84, respectively.

  In this embodiment, the sum of the power consumption of the two detection sensors SR for stopping water (solenoid valve closed) is detected so as to be approximately equal for each predetermined time section (T1, T2,..., Tn). Switching performance. Specifically, as shown in FIG. 7, the power consumption of the sum of the sensing cycle A1 of the detection sensor SR1 at the predetermined time T1 and the sensing cycle A2 of the detection sensor SR2, and the detection sensor SR1 at the predetermined time T2 are the same. The power consumption composed of the sum of the sensing cycle C1 and the sensing cycle C2 of the detection sensor SR2 is substantially equal to the power consumption composed of the sum of the sensing cycle n1 of the detection sensor SR1 and the detection sensor SR2 and the sensing cycle n2 at a predetermined time Tn. Become.

That is, since the time of water stoppage (solenoid valve closing) is divided into predetermined times and the priority of the detection sensor is switched for each of the divisions, the sensor with higher priority at each divided time Even if the solenoid valve is closed), it is possible to quickly detect an object to be detected in a short cycle. On the other hand, since the detection sensor with a low priority is detected in a long cycle, an effect of suppressing power consumption can be obtained.

  That is, the detection performance of each of the two detection sensors in a certain time segment can be individually controlled based on the result determined by the detection priority determination unit 83. For sensors with high priority, On the other hand, the low-priority sensor (detection sensor SR2) can detect the state of the object that is the target of the detection in a long cycle, so that power saving can be achieved without impairing usability.

  In this way, the water stoppage (solenoid valve closing) time is divided into predetermined times, and the detection sensor detects an object such as a user's hand by switching the priority of the detection sensor for each division. It is possible to set the optimum detection performance while suppressing the power consumption during the standby.

  In addition, the predetermined division in this embodiment can be defined as, for example, one day divided by approximately equal time. Specifically, as shown in FIG. 7, the predetermined time T1, the predetermined time T2, and the predetermined time Tn are substantially equal. In addition, it may be changed as appropriate, for example, by a period longer than one day, such as monthly, seasonal, or yearly.

  The detection priorities of the detection sensors in the predetermined category are set by comparing detection frequencies such as the number of detections in all the past or a predetermined period in the past and the total detection time. In addition, you may change suitably, such as comparing the detection order in all the past or the past predetermined period.

  Thus, since the detection performance of each of the two detection sensors is set according to the past detection state, for example, when the automatic faucet 2 is installed at home, the person who uses the automatic faucet 2 and Since the usage pattern of the automatic faucet 2 is substantially the same, it is possible to suppress power consumption during standby until the detection sensor detects an object such as a user's hand, and to efficiently control the detection performance of the detection sensor. .

  In other words, by setting the priority of the detection sensor according to the past detection state, it is possible to quickly detect an object such as a user in a frequently used time segment, and in the less frequently used time segment, the detection sensor It is possible to save power by making detections with a long period.

(Fifth embodiment)
The basic configuration of the automatic faucet 2 according to the fifth embodiment can be the same as that described with reference to FIGS.

FIG. 8 is a time chart showing the operation of the automatic water faucet according to the fifth embodiment.
The time chart shown in FIG. 8 shows that the sensing cycle, which is the detection performance of the two detection sensors SR1 and SR2, the detection signal, and the opening / closing timing of the solenoid valve are switched by operating the mode switch 41.

  In the above-described fourth embodiment, the priority of the detection sensor in the non-detection state or the standby state is switched every predetermined time. In contrast, in the fifth embodiment, the priority of the detection sensor in the non-detection state is switched to a predetermined priority. As a specific example, the priority is determined by the positional relationship between the mode switch 41 and the detection sensor SR.

In the specific example shown in FIG. 8, during the period from time t1 to time t11, the automatic faucet 2 operates in the automatic water discharge mode, and the detection sensors SR1 and SR2 operate at a predetermined sensing cycle (2 Hz). ing.
Here, when the mode changeover switch 41 is turned ON (time t11), the automatic faucet 2 enters the continuous water discharge mode, and during that time, the sensing of the two detection sensors is stopped to suppress power consumption (time t11). To time t2).

Subsequently, when the mode changeover switch 41 is turned ON again (time t2), the automatic faucet 2 returns to the automatic water discharge mode again.
At this time, the detection priority determination unit 83 sets the priority of the detection sensor SR2 (see FIG. 1), which is a detection sensor close to the mode changeover switch 41, to a high level.

  Thereafter, the detection performance switching unit 84 raises the sensing cycle of the detection sensor SR2 with high priority to 3 Hz, and lowers the sensing cycle of the detection sensor SR1 with low priority to 1 Hz (after time t2 and t7).

Each detection sensor SR maintains the sensing cycle until the predetermined time T elapses. However, when the user's hand or the like is detected before the predetermined time T elapses, the sensing cycle is increased to 8 Hz at that time (time). t3 and time t8).
And each detection sensor SR will return a sensing period to 2 Hz of initial setting, when it will be in the state which does not detect objects, such as a user's hand (time t4 and time t9).

That is, for a predetermined time T after the water discharge mode is switched to the automatic water discharge mode by the mode switch 41, the detection performance of the detection sensor SR2 on the side close to the mode switch 41 is improved, and the detection of the detection sensor SR1 on the far side is detected. The performance is lowered. This is based on the priority set from the relationship between the operation of the mode switch 41 and the movement of the user's hand.
For example, when the user changes the mode to the automatic water discharge mode by operating the mode changeover switch 41, the operated hand goes directly to the water outlet of the faucet body 2 in order to perform a hand washing action. Suppose there are many. In such a case, since the user's hand enters the detection range AR2 of the detection sensor SR2 on the side close to the mode changeover switch 41, the detection cycle of the detection sensor SR2 is set to be high so that the user can move more quickly. The hand can be detected.

  On the other hand, the detection sensor SR1 is far from the mode changeover switch 41, and it is unlikely that the user's hand will enter the detection area immediately after switching to the automatic water discharge mode. Power consumption can be suppressed without impairing the feeling of use.

In the present embodiment, the example in which the priority is determined from the positional relationship of the mode switch 41 has been described. However, the priority is not limited thereto, and the priority may be determined by the positional relationship of other components.
For example, when there is an operation unit that adjusts the temperature of hot water discharged from the water outlet of the faucet body 2, the priority of the detection sensor SR on the side close to the operation unit may be set high.
If it carries out like this, since the water discharge after temperature adjustment can be started rapidly, the user can confirm the condition of the adjusted temperature quickly.

In addition, when there is an operation unit for switching the water discharge form and the water discharge flow rate, the priority of the detection sensor near the operation unit may be set high.
If it carries out like this, the user can confirm the water discharge state after changing the water discharge form and the water discharge flow rate rapidly.
Thus, by determining the priority of the detection sensor in advance according to the function of the automatic water faucet 2, it is possible to set the optimum detection performance in a series of movements of the user, and to save Electricity can be achieved.

(Sixth embodiment)
Since the basic configuration of the automatic faucet 2 according to the sixth embodiment can be the same as that described with reference to FIGS. 1 to 3, the detailed description thereof is omitted. Moreover, the time chart which shows operation | movement of the automatic water tap concerning 6th Embodiment is demonstrated using FIG. 6 used by description of 3rd Embodiment.

  In the above-described third embodiment, detection during a predetermined time T after water stoppage (electromagnetic valve closing) based on the detection frequency while the detection sensor SR is detecting an object such as a user's hand. The detection performance of the sensor SR is switched. Further, in the above-described fourth embodiment, the detection performance of the detection sensor SR in the still water (electromagnetic valve closed) is switched. On the other hand, in the sixth embodiment, the priority of the detection sensor SR is determined based on the predetermined time T after the water stop (electromagnetic valve closing) and the water stoppage (electromagnetic valve close) other than the predetermined time T. Is switched.

  In FIG. 6, as described in regard to the third embodiment, the detection sensor SR2 does not detect an object at time t8, and then the detection sensor SR1 does not detect an object at time t3. Then, the sensor detection state determination unit 82 determines that there is no object, and the faucet driving unit 85 closes the electromagnetic valve 70 and stops water based on the output from the sensor detection state determination unit 82. At the same time, based on the output from the sensor detection state determination unit 82, the detection priority determination unit 83 starts measuring the predetermined time T and sets the priority of the detection sensor SR1 high (until time t4).

The detection performance switching unit 84 sets the sensing cycle of the high-priority detection sensor SR1 to be shorter than the sensing cycle of the detection sensor SR2.
The sensor driving unit 81 drives the detection sensors SR1 and SR2 based on the sensing cycle set by the detection performance switching unit 84, respectively. For example, the sensing period C1 can be 3 Hz and the sensing period C2 can be 1 Hz.
Thereafter, after a predetermined time T has elapsed, the detection priority determination unit 83 sets the priorities of the detection sensors SR1 and SR2 to be equal (time t4 and time t9).

The detection performance switching unit 84 sets the sensing cycle A1 of the detection sensor SR1 and the sensing cycle A2 of the detection sensor SR2 to be equal.
The sensor driving unit 81 drives the detection sensors SR1 and SR2 based on the sensing cycle set by the detection performance switching unit 84, respectively. For example, the sensing period A1 and the sensing period A2 can both be 2 Hz.

  In FIG. 6, the detection priority of the detection sensor SR1 and the detection sensor SR2 after the predetermined time T has elapsed after the water stop (solenoid valve closing) is equal, but as described in the fourth embodiment. The stop water (solenoid valve closed) time (after time t4 and t9) after the lapse of the predetermined time T is divided into predetermined times, and the priority of the detection sensor is switched for each division. The degrees are not necessarily equal.

In the present embodiment, as described with respect to the third embodiment and the fourth embodiment, the sum of the power consumption of the two detection sensors SR at a predetermined time T after the water stop (solenoid valve closing), The detection performance is switched so that the sum of the power consumption of the two detection sensors SR in each time segment of the still water (solenoid valve closed) after the predetermined time T has elapsed is approximately equal.
Similarly, in the present embodiment, the method for determining the priority of the detection sensor at a predetermined time T after water stoppage (solenoid valve closing) is as described above with reference to the third embodiment. The method for determining the priority of the detection sensor after elapse of the predetermined time T is as described above with respect to the fourth embodiment.

  In this embodiment, in addition to the effects described above with respect to the third embodiment and the fourth embodiment, the following effects can also be obtained. That is, the priority of the detection sensor SR at the predetermined time T after the water stop (electromagnetic valve closing) and the priority of the detection sensor after the elapse of the predetermined time T after the water stop (electromagnetic valve close). By switching and controlling the degree of determination, for example, when the automatic faucet 2 is installed at home, the person using the automatic faucet 2 and the usage pattern of the automatic faucet 2 are generally the same, Although the power consumption during standby until the detection sensor detects an object such as a user's hand can be reduced and the detection performance of the detection sensor can be controlled efficiently, the automatic faucet 2 is used in a pattern different from usual. Even at the same time, it is possible to save power without impairing usability.

  Specifically, it is assumed that the priorities of the usual detection sensors are equal in a certain time segment in which the water stops (solenoid valve is closed). Here, it is assumed that the detection sensor SR1 detects the user's hand in a pattern different from usual. Subsequently, even if the user moves his hand from the detection area AR1 and immediately holds his hand over the detection area AR1, the user quickly moves to a state where an object is detected correspondingly. Can discharge water quickly.

  That is, the priority of the detection sensor in a certain time segment with the water stop (solenoid valve closed) is set according to the past detection state, but even when a detection sensor with a low priority is detected suddenly, It is possible to save power without impairing usability.

  Thus, the detection performance of each of the two detection sensors has different priorities between the predetermined time T after the water stop (electromagnetic valve closing) and the elapse of the predetermined time T after the water stop (electromagnetic valve close). Therefore, power consumption during standby until the detection sensor detects an object such as a user's hand can be suppressed, and the detection performance of the detection sensor can be controlled efficiently.

DESCRIPTION OF SYMBOLS 1 ... Wash-stand 2 ... Automatic faucet 3 ... Faucet body 6 ... Bowl part 40 ... Operation panel 41 ... Mode changeover switch 50 ... Light projecting element 51 ... Light receiving element 70 ... Solenoid valve 80 ... Control part 81 ... Sensor drive part 82 ... sensor detection state determination unit 83 ... detection priority determination unit 84 ... detection performance switching unit 85 ... faucet drive unit 90 ... water supply source 100 ... water supply hose A1 ... sensing cycle
A2 ... Sensing cycle B1 ... Sensing cycle B2 ... Sensing cycle B22 ... Sensing cycle C1 ... Sensing cycle C2 ... Sensing cycle n1 ... Sensing cycle n2 ... Sensing cycle AR1 ... Detection region AR2 ... Detection region SR1 ... Detection sensor SR2 ... Detection sensor SRn ... Detection sensor t1 ... Timing t2 ... Timing t3 ... Timing t4 ... Timing t5 ... Timing t6 ... Timing t7 ... Timing t8 ... Timing t9 ... Timing t10 ... Timing t11 ... Timing tT1 ... Timing tT2 ... Timing tTn ... Timing T ... Predetermined time T1 ... predetermined time T2 ... predetermined time Tn ... predetermined time

Claims (10)

A faucet body for discharging hot water,
A solenoid valve that switches between water discharge and water stoppage from the faucet body;
A plurality of detection sensors provided to detect an object;
A controller that switches the state of the solenoid valve based on the detection states of the plurality of detection sensors;
In automatic faucet equipped with
The controller is
A sensor driving section for individually driving the plurality of detection sensors;
A sensor detection state determination unit for determining detection states of the plurality of detection sensors;
Based on the determination results of the plurality of sensor detection state determination units, a faucet drive unit that controls opening and closing of the solenoid valve;
A detection priority determination unit that determines the priority of the plurality of detection sensors;
Based on the determination result of the detection priority determination unit, a detection performance switching unit that individually controls the detection performance of the plurality of detection sensors;
An automatic faucet characterized by comprising:   The automatic detection system according to claim 1, wherein the detection performance switching unit switches detection performances while the plurality of detection sensors are detecting an object based on a determination result of the detection priority determination unit. Water faucet.   The automatic faucet according to claim 2, wherein the detection priority determination unit determines the priority according to a detection order of the plurality of detection sensors.   The automatic water faucet according to claim 2, wherein the detection priority determination unit determines the priority based on a detection frequency at which the plurality of detection sensors detect an object.   The automatic faucet according to claim 1, wherein the detection performance switching unit switches detection performance in a state where the plurality of detection sensors do not detect an object based on a determination result of the detection priority determination unit.   6. The automatic faucet according to claim 5, wherein the detection priority determination unit determines the priority according to past detection states of the plurality of detection sensors.   6. The automatic faucet according to claim 5, wherein the detection priority determination unit determines the priority based on a predetermined priority.   The detection performance switching unit switches detection performance for a predetermined time after the plurality of detection sensors are in a state in which no object is detected based on a determination result of the detection priority determination unit. Item 1. An automatic faucet according to item 1.   The automatic faucet according to claim 8, wherein the detection priority determination unit determines the priority according to a detection state while the plurality of detection sensors are detecting an object.   The detection performance switching unit includes a detection performance for a predetermined time after the plurality of detection sensors are not detecting an object, and a predetermined time after the plurality of detection sensors are not detecting an object. The automatic faucet according to claim 1, wherein the subsequent detection performance is switched based on different determination results of the detection priority determination unit.

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