JP4193313B2 - Automatic faucet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an automatic faucet that discharges water from a water discharge pipe when a sensor detects the presence of an object to be detected.
[0002]
[Prior art]
Using the sensor that intermittently emits sensor waves (light, sound, radio waves) and detects the presence or absence of the detected object based on the returning sensor waves, the flowchart of FIG. 14 (steps st1 to st8) and FIG. As shown in the time chart of FIG. 15, when the presence of the detected object is detected (YES in step st2), a valve opening signal is output to the electromagnetic valve (step st3), water is discharged from the water discharge pipe, and the presence is not detected ( Conventionally, an automatic faucet that stops the water by outputting a valve closing signal to the electromagnetic valve (NO in step st7) (step st8) is known.
This automatic faucet works comfortably in normal hand washing.
However, when washing tableware and foodstuffs, the movement of the detected object is large, and therefore the presence of the detected object is temporarily not detected (NO position in step st5 in FIG. 15 to NO in step st2 in FIG. 15). Position).
When the sensor no longer detects the presence of the detected object, the solenoid valve closes and the water discharge is interrupted, so the user feels uncomfortable.
[0003]
Therefore, as shown in the flowchart of FIG. 16 (steps St1 to St9) and the time chart of FIG. 17, when the sensor no longer detects the presence of the detected object (NO in step St7), the valve closing signal is delayed in the solenoid valve. If the delay timer is set to be output (step St8), water discharge will not be interrupted even if the movement of the detected object is large, such as when washing dishes or foodstuffs.
[0004]
[Problems to be solved by the invention]
However, since the water stop response is delayed each time, the water to be detected continues away (see the mesh portion in FIG. 17), and water saving is impaired.
[0005]
The object of the present invention is to provide a delayed water stop mode in which water discharge is not interrupted even if the sensor temporarily detects the presence of the object to be detected, and a normal mode in which water stop is stopped as soon as it is no longer detected, depending on the state of use. To provide an automatic faucet that can be switched.
[0006]
[Means for Solving the Problems]
[About claim 1]
The automatic faucet has a water discharge pipe that stops water by opening and closing the electromagnetic valve, a sensor that detects the presence or absence of the detected object, and outputs a valve opening signal to the electromagnetic valve when this sensor detects the presence of the detected object And a control means for outputting a valve closing signal when it is not detected.
The control means has a normal water stop mode in which a valve closing signal is immediately output to the electromagnetic valve when the sensor no longer detects the presence of the detected object, and a delayed water stop mode in which the signal is output with a delay.
[0007]
In normal hand-washing, the movement of the hand, which is the object to be detected, is small, and the sensor continues to detect the presence of the object to be detected and it is difficult to interrupt the water discharge, so when the sensor no longer detects the presence of the object to be detected, the solenoid valve is closed. Set the normal water stop mode that outputs the valve signal immediately (manual or automatic) to save water.
[0008]
When cleaning tableware and foodstuffs, the movement of tableware and foodstuffs to be detected is large, and the sensor may not temporarily detect the presence of the detected object, so if the sensor no longer detects the presence of the detected object Set the delay water stop mode (manual or automatic) to output the valve closing signal with a delay to the solenoid valve to prevent water discharge interruption.
[0009]
[About claim 2]
When washing tableware or foodstuffs, the movement of the body to be detected is large, and the following state is likely to occur. If it becomes such a state, it will estimate that the user is washing tableware and foodstuffs, and a control means will be in delay water stop mode and will prevent interruption of water discharge.
The state in which the sensor detects the presence of the detected object and the state in which it does not detect are repeated, and the number of repetitions reaches the set number within a predetermined time.
-The state where the presence of the detected object is detected is temporarily changed to the state where it is not detected, and the presence of the detected object is detected within a certain time.
[0010]
[About claim 3]
When shifting from dishwashing or food washing to normal hand washing, the movement of the detected object is reduced, so that the number of iterations is reduced and becomes less than the set number within the first predetermined time.
In addition, when the dishwashing and the food washing are finished, the state of detecting the presence of the detected object is not returned even if the second predetermined time is exceeded.
In such a case, the control means switches to the normal water stop mode, assuming that it has shifted to normal hand-washing or that dishwashing or food washing has ended. This can save water.
[0011]
[About claim 4]
When the control means is operating in the delayed water stop mode, the state in which the sensor detects the presence of the detected object as the tableware and ingredients are more difficult to detect by the sensor and the movement of the tableware and ingredients increases. And the number of repetitions of the state that is not detected increases, and the state that is not detected becomes longer.
Therefore, the delay time is set longer as the number of repetitions between the state in which the sensor detects the presence of the detected object and the state in which it is not detected is larger, and the longer the state in which the sensor is not detected.
Thereby, interruption of water discharge when the control means is operating in the delayed water stop mode can be further prevented.
[0012]
[About Claim 5]
The automatic faucet has a water discharge pipe that stops water by opening and closing a solenoid valve, and a sensor wave that intermittently radiates a sensor wave, and whether or not this sensor wave is reflected back to the object to be detected. has a Rousset capacitors to detect the presence, and control means said sensor you Outputs an opening signal to the solenoid valve when detecting the presence of the detected object of the present.
When the sensor detects that the detection target does not exist after the valve opening signal is output, the control means performs a confirmation operation for emitting a sensor wave. Control means, first water stop mode and, second water-stopping mode where the sensor is performed a predetermined number of times more than the first water-stopping mode confirmation operation at predetermined time intervals the sensor makes the number of check operations given little every predetermined time possess the door, control means, sensor switches to when detecting the presence of the detected body second water stopping mode in the confirmation operation.
[0013]
In normal hand-washing (beginning with normal hand-washing first when washing dishes and foods) , the movement of the detected hand is small, and the water discharge is interrupted by detecting the presence of the detected object even a few times. Therefore, in the case of normal hand washing, the control means sets the first water stop mode in which the sensor performs the confirmation operation a small number of times to save water.
A control means will switch to 2nd water stop mode, if presence of a to-be-detected body is detected in confirmation operation. The cleaning of tableware and food, large movements of tableware and food is the detection object, but the sensor may not detect the presence of the detection object is present and performs a small number of predetermined confirmation operation at predetermined time intervals, the sensor Since the confirmation operation is automatically switched to the second water stop mode in which the confirmation operation is performed a predetermined number of times more than the first water stop mode every predetermined time , it is possible to prevent the water discharge from being interrupted.
[0014]
[About claim 6]
The automatic faucet has a water discharge pipe that stops water by opening and closing a solenoid valve, and a sensor wave that intermittently radiates a sensor wave, and whether or not this sensor wave is reflected back to the object to be detected. A sensor that performs a confirmation operation to detect the presence or absence of a sensor, and a control means that outputs a valve opening signal to the solenoid valve when the presence of the detected object is detected by the confirmation operation, and outputs a valve closing signal when it cannot be detected by the confirmation operation And have.
[0015]
When the sensor repeats the state in which the presence of the detected object is detected and the state in which the sensor is not detected, the number of confirmation operations is increased as the number of repetitions increases and as the number of undetected states increases.
In normal hand-washing, the movement of the hand, which is the object to be detected, is small, so the state where the sensor detects the presence of the object to be detected and the state where it is not detected do not repeat, or the number of repetitions does not detect even if it is repeated Is short. In this case, the number of confirmation operations is reduced. In addition, since the presence of the detected object is detected even with a small number of confirmation operations, water discharge is not interrupted. This can save water.
[0016]
When washing tableware and foodstuffs, the movement of the tableware and foodstuffs to be detected is large, so it is easy to repeat the state in which the sensor detects the presence of the object to be detected and the state in which it is not detected. The number of iterations is large, and the state of not detecting is long. In this case, the water discharge is prevented from being interrupted by increasing the number of confirmation operations so that the presence of the detected object is easily detected.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of the present invention (corresponding to claims 1, 2, and 3) will be described with reference to FIGS.
The automatic faucet A includes a water discharge pipe 3 extending from the temperature control unit 1 toward the sink 2, an electromagnetic valve 4 for discharging water, a sensor 5 attached to a water discharge head 30 of the water discharge pipe 3, and an electromagnetic valve. 4 and a controller 6 that performs control such as opening and closing of 4.
[0018]
As shown in FIGS. 1 and 2, the temperature control unit 1 has a temperature control controller 11 and an electromagnetic valve 4 disposed therein, and is fixed above the sink rear plate 21 by a fixture (not shown). Yes.
The temperature controller 11 is connected to the tips of the water supply pipe 12 and the hot water supply pipe 13, and the hot water temperature at the outlet can be freely determined by manual operation of the temperature adjustment handle 14 that adjusts the mixing ratio of hot water and water.
The water supply pipe 12 is provided with a stop cock 121 on the way (the space 22 below the sink), and the base end is connected to the water supply.
The hot water supply pipe 13 is provided with a hot water tap 131 in the middle (the space 22 under the sink), and the base end is connected to a water heater or a boiler.
[0019]
The water discharge pipe 3 is formed by connecting a plurality of metal rings, and has flexibility that can be freely bent.
The base of the water discharge pipe 3 penetrates the upper surface of the temperature control unit 1 and is inserted into the temperature control unit 1, and the base end surface is connected to the outlet of the electromagnetic valve 4.
Further, a water discharge head 30 having a size of a match box made of plastic or the like is attached to the tip of the water discharge pipe 3.
[0020]
A water discharge port 31 of the water discharge pipe 3 is opened on the lower surface of the water discharge head 30, and an operation changeover switch 15 and a mode display LED 16 are disposed on the upper surface. The amount of hot water (water) discharged from the water discharge port 31 can be varied by operating the flow control knob 17.
The operation changeover switch 15 is electrically connected to the controller 6, and the operation state by pressing operation is the operation stop (LED 16 is turned off) → automatic mode setting (lights in a color corresponding to the mode in which the LED 16 is set) → dishwashing mode; fixed (LED 16 is lit red) → normal mode; fixed (LED 16 is lit green) → operation is stopped (LED 16 is turned off) in this order.
[0021]
The sensor 5 includes an LED 51 that is a light emitting element and a photodiode 52 that is a light receiving element, and the LED 51 and the photodiode 52 are arranged obliquely so that the optical axes intersect at the approximate center of the sink 2.
When there is an object to be detected in the approximate center of the sink 2, the light emitted from the LED 51 strikes the object to be reflected and enters the photodiode 52. When there is no object to be detected, the light hits the bottom surface of the sink 2 and is reflected in the other direction and does not enter the photodiode 52.
[0022]
In this embodiment, the controller 6 includes an AC adapter 61, a rectifier circuit 62, a sensor drive circuit 63, a solenoid valve drive circuit 64, and a microcomputer 65, as shown in FIGS.
[0023]
The AC adapter 61 steps down AC-100V to a low AC voltage of about 10V by the transformer 611.
The rectifier circuit 62 rectifies a low AC voltage to obtain a stabilized voltage of + 5V.
The sensor drive circuit 63 is a circuit for applying a voltage for intermittently lighting the LED 51.
[0024]
The solenoid valve drive circuit 64 is a circuit for applying a voltage for closing and opening the solenoid valve 4.
In the normal water stop mode, the electromagnetic valve drive circuit 64 immediately outputs a valve closing signal to the electromagnetic valve 4 when the sensor 5 no longer detects the presence of the detected object. In the dishwashing mode, when the sensor 5 no longer detects the presence of the detected object, a valve closing signal is output to the electromagnetic valve 4 after 1 second.
[0025]
Next, the operation of the microcomputer 65 in the mode automatic setting will be described based on the flowchart of FIG. 6 and the time chart of FIG.
When the automatic faucet A is turned on, the normal water stop mode is set in step s1 (LED 16 is lit in green).
Wait for 0.5 seconds in step s2.
[0026]
After step s2, the sensor drive circuit 63 applies a voltage to the LED 51 and irradiates light from the LED 51 in the sink 2 direction in step s3. If the reflected light is incident on the photodiode 52 and the presence of the detected object is detected, the process proceeds to step s4. If the reflected light is not incident and the presence of the detected object is not detected, the process proceeds to step s5.
In step s4, the microcomputer 65 starts outputting a valve opening signal to the solenoid valve drive circuit 64, the solenoid valve drive circuit 64 energizes the solenoid valve 4, and the solenoid valve 4 is opened.
[0027]
In step s5, the timer (around 2 seconds) is counted and the process proceeds to step s6.
In step s6, it is determined whether or not the timer has expired. If the timer has not expired (NO), the process returns to step s2. If the timer has expired (YES), the process proceeds to step s7.
In step s7, the normal water stop mode is set (LED 16 lights in green), the timer is returned to 0, and the process returns to step s2.
[0028]
Wait for 0.5 seconds in step s8.
After step s8 ends, in step s9, the sensor drive circuit 63 applies a voltage to the LED 51, and irradiates light from the LED 51 in the direction of the sink 2. If the reflected light is incident on the photodiode 52 and the presence of the detected object is detected, the process returns to step s8. If the reflected light is not incident and the presence of the detected object is not detected, the process proceeds to step s10.
[0029]
Wait for 0.25 seconds in step s10.
After step s10 ends, in step s11, the sensor drive circuit 63 applies a voltage to the LED 51, and irradiates light from the LED 51 in the direction of the sink 2. If the reflected light is incident on the photodiode 52 and the presence of the detected object is detected, the process proceeds to step s12. If the reflected light is not incident and the presence of the detected object is not detected, the process proceeds to step s13.
[0030]
In step s12, the dishwashing mode is set (LED 16 lights red), and the process returns to step s8.
In step s13, it is determined whether or not the current mode is the dishwashing mode. If the mode is the dishwashing mode (YES), the process proceeds to step s14. If the current mode is the normal mode (NO), the process proceeds to step s15.
[0031]
In step s15, the microcomputer outputs a valve closing signal to the solenoid valve drive circuit 64, and the solenoid valve drive circuit 64 stops energization of the solenoid valve 4.
Wait for 0.5 seconds in step s16.
[0032]
After step s16 ends, in step s17, the sensor drive circuit 63 applies a voltage to the LED 51, and irradiates light from the LED 51 in the direction of the sink 2. If the reflected light is incident on the photodiode 52 and the presence of the detected object is detected, the process proceeds to step s18. If the reflected light is not incident and the presence of the detected object is not detected, the process returns to step s2.
In step s18, the dishwashing mode is set (LED 16 lights red), and the process returns to step s4.
[0033]
The automatic faucet A of the present embodiment has the following advantages.
[A] When the automatic faucet A is set to the mode automatic setting by operating the operation changeover switch 15, the automatic faucet A determines whether the hand is being washed or the state in which dishes or foods are being washed. When it is no longer detected (NO in step s9 and NO in s11), a valve closing signal is immediately output to the solenoid valve drive circuit 64 (NO in step s11 → step s15). The normal water stop mode and the solenoid valve drive circuit The configuration is such that the output is delayed after 64 (NO in step s11 → step s15) and the delayed water stop mode is automatically switched.
For this reason, interruption of water discharge does not occur easily when washing tableware, foodstuffs, etc., and it does not give a user discomfort. Further, when the hand is being washed (in the normal water stop mode), water is stopped immediately after the hand that is the object to be detected is withdrawn from the sink 2, so that water saving can be ensured.
[0034]
[A] The automatic faucet A changes from the state of detecting the detected object (YES in step s9) to the state of not detecting the detected object (NO in step s9), and within the first predetermined time (maximum, step In the detection state (YES in step s11 or YES in step s17) at s10 (0.25 seconds + step s16 0.5 seconds), the dishwashing mode is automatically set (steps s12 and s18).
Further, during the operation in the dishwashing mode, a second predetermined time (0.25 seconds in step s10 + 1 second in step s14 + 0.5 seconds in step s16 + 0.5 seconds in step s2 + timer time in step s5) If the detected state is not reached even after exceeding (NO in step s3), the configuration returns to the normal water stop mode (step s7).
For this reason, it is possible to accurately determine whether the user is washing his / her hand or washing the tableware or food.
[0035]
[C] The automatic faucet A has a water discharge head provided with an operation changeover switch 15 that can be switched in order of operation by pressing operation: operation stop → automatic mode setting → dishwashing mode (fixed) → normal mode (fixed) → operation stop. 30.
For this reason, when washing dishes and foods continuously, or when washing hands continuously, by fixing the mode, the water discharge is interrupted or the waste water is discharged while switching to another mode automatically. Can be prevented.
Further, when leaving the kitchen for shopping or the like, if the operation changeover switch 15 is stopped, water discharge does not occur even if tableware, food, etc. roll into the sink 2.
[0036]
Next, a second embodiment (corresponding to claim 5) of the present invention will be described with reference to FIGS.
The automatic faucet B is different from the automatic faucet A in the following points.
A sensor 5 including an LED 51 and a photodiode 52 is attached to the water discharge head 30 of the water discharge pipe 3, and a water discharge port 31 of the water discharge pipe 3 is opened on the lower surface of the water discharge head 30.
[0037]
In this embodiment, the controller 6 includes a sensor drive circuit 63, a solenoid valve drive circuit 64, a microcomputer 65, a battery 66, and a voltage monitoring circuit 67 as shown in FIGS.
[0038]
Next, the operation of the microcomputer of the controller 6 will be described with reference to FIGS.
When the automatic faucet B is turned on, the normal water stop mode is set in step S1.
In step S2, the system waits for 0.5 seconds.
[0039]
After step S2, the sensor drive circuit 63 applies a voltage to the LED 51 and irradiates light in the direction of the sink 2 from the LED 51 in step S3. If the reflected light is incident on the photodiode 52 and the presence of the detected object is detected, the process proceeds to step S4. If the reflected light is not incident and the presence of the detected object is not detected, the process proceeds to step S5.
In step S4, the microcomputer 65 starts outputting a valve opening signal to the solenoid valve drive circuit 64, the solenoid valve drive circuit 64 energizes the solenoid valve 4, and the solenoid valve 4 is opened.
[0040]
In step S5, a timer (around 2 seconds) is counted and the process proceeds to step S6.
In step S6, it is determined whether or not the timer has expired. If the timer has not expired (NO), the process returns to step S2. If the timer has expired (YES), the process proceeds to step S7.
In step S7, the normal water stop mode is set, the timer is returned to 0, and the process returns to step S2.
[0041]
In step S8, the process waits for 0.5 seconds.
After step S8 is completed, in step S9, the sensor drive circuit 63 applies a voltage to the LED 51 and irradiates light from the LED 51 in the direction of the sink 2. If the reflected light is incident on the photodiode 52 and the presence of the detected object is detected, the process returns to step S8. If the reflected light is not incident and the presence of the detected object is not detected, the process proceeds to step S10.
[0042]
In step S10, it is determined whether or not the current mode is the dishwashing mode. If the mode is the dishwashing mode (YES), the process proceeds to step S11. If the current mode is the normal mode (NO), the process proceeds to step S12.
In step S11, the number of confirmations is set to 3, and the process proceeds to step S13.
In step S12, the number of confirmations is set to 1 and the process proceeds to step S13.
[0043]
In step S13, the process waits for 0.25 seconds.
After step S13 ends, in step S14, the sensor drive circuit 63 applies a voltage to the LED 51, and irradiates light from the LED 51 in the direction of the sink 2. When the reflected light enters the photodiode 52 and the presence of the detected object is detected, the process proceeds to step S15, and when the reflected light does not enter and the presence of the detected object is not detected, the process proceeds to step S16.
In step S15, dishwashing is set, and the process returns to step S8.
[0044]
In step S16, it is determined whether or not the number of confirmations has been completed. If the number of confirmations has been completed (YES), the process proceeds to step S17. If not (NO), the process returns to step S13.
[0045]
In step S <b> 17, the microcomputer 65 outputs a valve closing signal to the solenoid valve drive circuit 64, and the solenoid valve drive circuit 64 stops energization of the solenoid valve 4.
In step S18, the process waits for 0.5 seconds.
[0046]
After step S18 ends, in step S19, the sensor drive circuit 63 applies a voltage to the LED 51, and irradiates light from the LED 51 in the direction of the sink 2. When the reflected light enters the photodiode 52 and the presence of the detected object is detected, the process proceeds to step S20. When the reflected light does not enter and the presence of the detected object is not detected, the process returns to step S2.
In step S20, the dishwashing mode is set, and the process returns to step S4.
[0047]
The automatic faucet B of the present embodiment has the following advantages.
[D] Automatic faucet B has a configuration in which it is automatically set to the normal water stop mode or the dishwashing mode shown below, by determining whether the hand is being washed or the state in which dishes and foods are being washed. is there.
For this reason, the water discharge hardly occurs during dishwashing or food washing (set to the dishwashing mode), and the user is not uncomfortable. Further, when the hand is being washed (set to the normal mode), water is immediately stopped when the hand, which is the object to be detected, is withdrawn from the sink 2, so that water saving can be ensured.
[0048]
(Normal water stop mode)
If the sensor 5 no longer detects the detected object (NO in step S9), the confirmation operation for confirming the detected object is performed once after 0.25 seconds, and if the detected object still cannot be detected, the solenoid valve drive circuit 64 is turned on. A valve closing signal is output.
(Dishwashing mode)
When the sensor 5 no longer detects the object to be detected (NO in step S9), a confirmation operation for confirming the object to be detected is performed up to three times every 0.25 seconds. If the object to be detected still cannot be detected, the solenoid valve is driven. A valve closing signal is output to the circuit 64.
[0049]
The present invention includes the following embodiments in addition to the above embodiments.
a. In the automatic faucet A of the first embodiment (in the case of mode automatic setting), the state in which the sensor 5 detects the detected object and the state in which it does not detect are repeated, and the number of repetitions is, for example, within 1 second (within a predetermined time) It may be changed to a configuration that switches to the dishwashing mode when it reaches 3 times (corresponding to the set number) {corresponding to claim 2}.
[0050]
In addition, when the automatic faucet A of the first embodiment (in the case of mode automatic setting) is operating in the dishwashing mode (corresponding to the delayed water stop mode), there are a state in which the sensor 5 detects a detected object and a state in which it does not detect It may be changed to a configuration that switches when the number of repetitions decreases to less than 2 times (corresponding to less than the set number) in 1 second (corresponding to the first predetermined time) {corresponding to claim 3}.
[0051]
Further, when the automatic faucet A of the first embodiment (when the mode is automatically set) is operating in the dishwashing mode (corresponding to the delayed water stop mode), the sensor 5 detects the detected object and does not detect it. The delay time until the valve closing signal is output to the solenoid valve drive circuit 64 is set longer as the number of repetitions increases and the period during which the detection target is not detected is longer. Also good {corresponds to claim 4}.
[0052]
b. In the automatic faucet B of the second embodiment, when the state in which the sensor 5 detects the presence of the detected object and the state in which it does not detect are repeated, the longer the number of repetitions, the longer the period in which the detected object is not detected. You may change to the structure which the frequency | count of confirmation operation increases so much (corresponding to claim 6).
[0053]
c. The sensor wave radiated from the sensor may be a radio wave, a sound wave or the like other than light (corresponding to claims 5 and 6).
[0054]
d. A configuration in which the sensor continuously detects the presence or absence of the object to be detected may be adopted (corresponding to claims 1 to 4).
[Brief description of the drawings]
FIG. 1 is an explanatory view of the structure of an automatic faucet according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view (a) of the temperature control unit of the automatic faucet, an internal structure diagram (b) on the front side of the temperature control unit, and an internal structure diagram (c) on the side surface side.
FIG. 3 is a cross-sectional view (a) on the front side and a cross-sectional view (b) on the side of the water discharge head of the automatic faucet.
FIG. 4 is a block diagram of the automatic faucet.
FIG. 5 is a component layout diagram of the automatic faucet.
FIG. 6 is a flowchart showing the operation of the microcomputer of the automatic faucet controller.
FIG. 7 is a time chart showing the operation of the automatic faucet.
FIG. 8 is a time chart showing the operation of the automatic faucet.
FIG. 9 is a structural explanatory view of an automatic water faucet according to a second embodiment of the present invention.
FIG. 10 is a block diagram of the automatic faucet.
FIG. 11 is a component layout diagram of the automatic faucet.
FIG. 12 is a flowchart showing the operation of the microcomputer of the automatic faucet controller.
FIG. 13 is a time chart showing the operation of the automatic faucet.
FIG. 14 is a flowchart showing the operation of the automatic faucet according to the prior art.
FIG. 15 is a time chart showing the operation of the automatic faucet according to the prior art.
FIG. 16 is a flowchart showing the operation of the automatic faucet according to the prior art.
FIG. 17 is a time chart showing the operation of the automatic faucet according to the prior art.
[Explanation of symbols]
3 Water discharge pipe 4 Solenoid valve 5 Sensors A and B Automatic faucet 65 Microcomputer (control means)

Claims (6)

A water discharge pipe that stops water by opening and closing a solenoid valve;
A sensor for detecting the presence or absence of the detected object;
In the automatic faucet having a control means for outputting a valve opening signal to the electromagnetic valve when the sensor detects the presence of the detected object and outputting a valve closing signal when the sensor is not detected,
The control means has a normal water stop mode that immediately outputs a valve closing signal to the electromagnetic valve when the sensor no longer detects the presence of the detected object, and a delayed water stop mode that outputs the signal after a delay. And automatic faucet. When the state where the sensor detects the presence of the object to be detected and the state where it is not detected are repeated, and the number of repetitions reaches a set number within a predetermined time,
Alternatively, the delay water stoppage mode is selected when the state where the presence of the detected object is detected is changed to a state where it is not detected and the presence of the detected object is detected within a predetermined time. The automatic faucet according to claim 1, wherein: While the control means is operating in the delayed water stop mode,
When the number of repetitions is less than the set number within the first predetermined time, or when the presence of the detected object is not detected even after the second predetermined time, the normal water stop mode is set. The automatic faucet according to claim 2, wherein When the control means is operating in the delayed water stop mode,
The automatic delay according to any one of claims 1 to 3, wherein the delay time is set to be longer as the number of repetitions of the detection state and the non-detection state is larger, or as the non-detection state is longer. Water faucet. A water discharge pipe that stops water by opening and closing a solenoid valve;
Intermittently emits sensor wave, and Rousset capacitors to detect the presence or absence of the detection object based on whether the sensor wave reflected back to the sensing object,
Have a control means you Outputs an opening signal to the solenoid valve and the sensor detects the presence of the detection object,
In the automatic faucet that performs the confirmation operation of radiating the sensor wave when the sensor detects that the detected object does not exist after the valve opening signal is output,
Wherein said control means includes a first water stop mode in which the sensor is performed fewer times of a given said checking operation at predetermined time intervals, wherein the sensor is performed a predetermined number of times more than the first water-stopping mode the checking operation at every predetermined time have a second water stop mode,
The automatic faucet characterized in that the control means switches to the second water stop mode when the sensor detects the presence of the detected object in the confirmation operation . A water discharge pipe that stops water by opening and closing a solenoid valve;
A sensor that intermittently radiates a sensor wave and performs a check operation to detect the presence or absence of the detected object based on whether or not the sensor wave is reflected back to the detected object; and
In an automatic faucet having a control means for outputting a valve opening signal to the electromagnetic valve when the presence of the detected object is detected by the confirmation operation, and outputting a valve closing signal when it cannot be detected by the confirmation operation,
When the sensor repeats the state of detecting the presence of the object to be detected and the state of not detecting the sensor, the number of times of the confirmation operation is increased as the number of repetitions increases and as the state of non-detection increases. Automatic faucet.

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