JPH0358611B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention provides water supply to water washers such as toilet bowls and hand wash basins.
The present invention relates to a water supply control device that automatically controls the water supply based on the detection of the use of a water washer by a sensing unit, and particularly relates to a water supply control device whose driving power source is a battery.

<Conventional technology> Conventionally, as this type of water supply control device,
-126831 publication is known.

To explain the method disclosed in Japanese Patent Application Laid-open No. 59-126831, the sensing section constantly emits infrared rays several thousand times per second from a light emitting element, and this infrared ray hits the user of the toilet and reflects it. It is composed of a diffuse reflection type photoelectric sensor that generates a sensing signal when a light receiving element receives reflected light.

Therefore, in the conventional system described above, the sensing part constantly emits infrared rays, so even though the driving power source is a battery, it consumes a lot of power, and the battery life is short, so it cannot be used frequently. It is necessary to replace the battery, which is not only troublesome but also uneconomical.

<Problems to be Solved by the Invention> A problem to be solved by the present invention is to reduce the power consumption of the sensing section.

<Means for Solving the Problems> Technical means taken by the present invention to solve the above problems include a water washer, a sensing part that detects the use of the water washer, and a sensing signal from this sensing part. In a water supply control device that uses a battery as a driving power source, the sensing unit includes a control unit that outputs an opening/closing signal to the water supply unit based on the control unit, and a water supply unit that opens and closes a valve based on the opening/closing signal from the control unit. and an infrared sensor having a light-receiving element, the light emitting element emits infrared light intermittently at a predetermined cycle, and the light emitting cycle when the user is not detected for a set time continues. It is characterized in that the light projection cycle is made longer than when the sensor is sensing the user, and then the light projection cycle is made even longer when the user is not detected for a set period of time.

<Function> The present invention shortens the period of infrared light emitted from the light emitting element intermittently when the user is being sensed, and lengthens it when the user is not detected for a set period of time. If the state of not sensing continues for a set period of time, the number of infrared rays is emitted is reduced by increasing the time even further.

<Example> An example of the present invention will be described below based on the drawings.

In this embodiment, as shown in FIG. 1, the water washer 1 is a urinal 1a, and above the urinal 1a,
To be more precise, the sensing part 2 is embedded in the wall W at a height corresponding to the height of the user's chest when the user is standing in front of the urinal 1a, and the latching that constitutes the water supply part 4 is installed. A solenoid 4a and a flush valve 4b are installed in an embedded manner.

The sensing part 2 is a light emitting element 2 made of a light emitting diode.
It is a diffuse reflection type infrared sensor including a light receiving element 2b made of a phototransistor and a light receiving element 2b, and is connected to a battery 5 as a drive power source via a control unit 3.

The light emitting element 2a communicates with a light emitting drive circuit _3a7 of the control unit 3, which will be described later, and emits infrared light using the output from the circuit _3a7 , and this infrared light illuminates the urinal 1a for urination. When the light hits the user standing in front of it, it is diffusely reflected and a part of this reflected light is received by the light receiving element 2b and output to the light receiving amplifier circuit _3a8 , which will be described later.

The control section 3 can be roughly divided into a sensor circuit 3a that communicates with the light emitting element 2a and light receiving element 2b of the sensing section 2 and generates a sensing signal, and a control circuit 3b that operates based on this sensing signal and generates a drive signal. and a drive circuit 3c which operates based on the drive signal and generates an output signal to operate the latching solenoid 4a.

The configurations of the sensor circuit 3a and the control circuit _3b will be explained with reference to FIG. The signal is output to a 1/2 minute period 3a ₂ , a 1/5 minute period 3a ₃ and a multiplexer 3a ₄ .

1/2 minute period 3a ₂ is the above multivibrator 3a ₁
It obtains half the frequency of the pulse signal from
A pulse signal is continuously transmitted with a period of 2t, that is, a 2 second period, and a 1/5 minute period of 3a ₃ is a multivibrator 3.
It obtains the frequency of 1/5 of the pulse signal from a ₁ ,
Pulse signals are continuously transmitted with a period of 5t, that is, a period of 5 seconds, and these pulse signals with periods of 2t and 5t are also output to the multiplexer _3a4 .

Multiplexer 3a ₄ is flip-flop 3
a ₅ , the selection signal given from the flip-flop 3a ₆ is input to output a pulse signal with a period t from the multivibrator 3a ₁ , or a pulse signal with a period of 1/2 is 3
Select whether to output a pulse signal with a period of 2t from a ₂ or a pulse signal with a period of 5t from the 1/5 minute period 3a ₃ , and the selected output from the multiplexer 3a ₄ is sent to the light projection drive circuit. 3a ₇ is entered,
Infrared light is emitted from the light emitting element 2a based on the output from the light emitting drive circuit _3a7 .

That is, the period of infrared light emitted from the light emitting element 2a is selected from t, _2t , and 5t by selection inputs from the flip-flops 3a5 and _3a6 .

On the other hand, when the light-receiving amplifier circuit _3a8 connected to the light-receiving element 2b emits infrared light from the light-emitting element 2a,
When the light receiving element 2b receives reflected light even once and detects the presence of a user, it outputs a one-shot pulse signal from the reflected light one-shot circuit _3a9 , and this pulse signal is sent to the flip-flop via the OR circuit _3a10 . _3a5 and flip-flop _3a6 , and also to clear the binary counter _3a11 .

When a pulse signal is input to the set of flip-flops 3a ₅ and 3a ₆ , a Hi pulse is output to the select terminals S ₁ and S ₂ of the multiplexer 3a ₄ , respectively, and the multiplexer 3a ₄ selects the period t and selects the light emitting element. 2a emits light with a period t, and since a pulse signal is input to the clear binary counter 3a ₁₁ , the Qn to clear the flip-flop 3a ₆ is
Output becomes Low.

After that, even if the user leaves in front of the urinal 1a and emits infrared rays from the light emitting element 2a, the light receiving element 2
When no light is received at b, a one-shot pulse signal is output from the no-reflected-light one-shot circuit _3a12 , and this pulse signal is input to the clear flip-flop _3a5 , and is further input to the binary counter 3a.
It is also input to the _a11 clock.

When a pulse signal is input to clear the flip-flop _3a5 , the Q of the flipflop _3a5 is inputted to the select terminal _S1 of the multiplexer _3a4 .
The output becomes Low, and the binary counter _3a11 starts counting because the pulse signal is input to the clock, but since the Qn output to clear the flip-flop _3a6 remains low, the input signal is input to the select terminal _S2 of the multiplexer _3a4 . The Q output of the flip-flop _3a6 is Hi, the multiplexer _3a4 is switched from period t to 2t, and thereafter light is emitted from the light emitting element 2a at a rate of 2t.

Furthermore, if the light receiving element 2b continues to receive no light, each time a pulse signal is input from the no-reflection one-shot circuit 3a ₁₂ to the clock of the binary counter 3a ₁₁ , the count number is increased and this count number reaches the preset count. For example, when the fourth pulse signal is input, the Qn output to clear flip-flop _3a6 becomes Hi for the first time, and the input to select terminal _S2 of multiplexer _3a4 becomes Hi.
goes low and switches the multiplexer _3a4 from the period 2t.
After that, the light emitting element 2a emits light at 5t.

When light is received by the light receiving element 2b during the transition from the light projection period t to 2t and from 2t to 5t, the period immediately returns to the period t as described above.

Further, the pulse signal outputted from the one-shot circuit _3a9 with reflected light is input to the binary counter _3b1 forming a part of the control circuit 3b, and the pulse signal outputted from the one-shot circuit _{3a12 without reflected light is input into the binary counter 3b1} which constitutes a part of the control circuit 3b. Input to clear counter _3b1 .

Therefore, when this binary counter _3b1 detects a user, a pulse signal is input from the one-shot circuit _3a9 with reflected light to the counter, so if it starts counting and this state continues, the one-shot circuit _3a9 with reflected light inputs a pulse signal to the counter. Each time a pulse signal is input to the counter, the count number is increased and this count number is output to the digital comparator _3b2 , and when the user leaves in front of the urinal 1a, a pulse signal is generated from the reflected light or one shot circuit _3a12 . is input to clear and returns the count to 0.

The digital comparator _3b2 compares the count input from the binary counter _3b1 with a detection count setting value, for example 4, set in advance by the detection count setting circuit _3b3 , and if the count number is smaller than the detection count setting value 4. does not output to the flip-flop _3b4 , but outputs Hi to the flip-flop _3b4 as soon as the count number becomes larger than the detection count setting value 4, and then outputs a low signal at the same time as the count number becomes 0.

When the input from _the digital comparator _3b2 falls from Hi to Low, the flip-flop 3b4 outputs Hi to the OR circuit _3a10 , the AND circuit _3b5 , and the drive circuit 3c.

Since there is no user at this time, there is no output from the reflected light one-shot pulse circuit _3a9 to the set of flip-flops _3a5 and _3a6 via the OR circuit _3a10 , but instead, the output from the flip-flop _3b4 is removed. The Hi output is input to the set of flip-flops 3a ₅ and 3a ₆ via the OR circuit 3a ₁₀ , and the outputs from these both to the select terminals S ₁ and S ₂ of the multiplexer 3a ₄ become Hi, and the multiplexer 3a ₄ is cycled. Maintain at t.

The AND circuit 3b ₅ connects another input terminal to the light projection drive circuit 3a ₇ , and when outputting from the circuit 3a ₇ and outputting Hi to the drive circuit 3c, shifts the shift register 3b ₆ . Output to.

The shift register 3b ₆ is the light projection drive circuit 3a ₇
A plurality of Q outputs are provided that change to Hi every time an output is output from the output, and the output count setting value is set depending on the number of Q outputs. In this embodiment, when the fourth Q output becomes Hi, a pulse is output from the one-shot pulse circuit _3b7 . Output a signal.

This pulse signal is input to the shift register _3b6 and flip-flop _3b4 to clear the output from the flip-flop _3b4 to the drive circuit 3c.
At the same time, the output to the OR circuit 3a ₁₀ is changed to Low.

Therefore, the output from the OR circuit _3a10 to the set of flip-flops _3a5 and _3a6 disappears, and the Q of the flip-flop _3a5 is inputted to the select terminal _S1 of the multiplexer _3a4 with the output from the one-shot circuit _3a12 without reflected light. The output becomes Low and switches the multiplexer _3a4 from period t to 2t.

A time chart of the sensor circuit 3a and control circuit 3b is shown in FIG.

Note that these sensor circuits 3a and control circuits 3b
is not limited to what is shown in the figure, for example, a microcomputer may be used for a part of it.

Next, the configuration of the drive circuit 3c will be explained according to FIG. 4. The input, that is, the Hi output from the flip-flop _3b4 is connected to the open side AND circuit _3c1 and the NOT circuit _3c2.
is input to the closed-side AND circuit _3c3 via
It is also input to the exclusive OR circuit _3c4 .

The exclusive OR circuit _3c4 has a resistor R on one input side.
By interposing the capacitor C and the flip-flop _3b4 , a pulse signal is output when the output from the flip-flop 3b4 switches from Low to Hi and when it switches from Hi to Low.

Normally, when a user is not detected, the input to the exclusive OR circuit _3c4 is low, so no pulse signal is output from the circuit _3c4 , and the open drive transistor _3c9 and the close drive transistor described later 3
c ₁₉ maintains the OFF state.

Here, from flip-flop 3b ₄ to drive circuit 3
When the output to c switches from Low to Hi, the open side AND
Hi is input to one input terminal of circuit 3c ₁ , and the closed side
NOT circuit 3c ₂ is connected to one input terminal of AND circuit 3c ₃
A low signal is input through the exclusive OR circuit 3c4, and a pulse signal is output from the exclusive OR circuit _3c4 .

This pulse signal is input to the flip-flop _3c5 and outputs Hi, and is input to another flip-flop _3c6 to make the Q output high and low, and is also input to the 50ms one-shot timer _3c7 . to start its operation and set the Q output to Hi.

The output of the flip-flop _3c5 and the output of the 50 msec one-shot timer _3c7 are input to the AND circuit _3c8 , but since both are Hi, the circuit _3c8
is the other input terminal of the open side AND circuit 3c ₁ and the closed side AND
Hi is output to the other input terminal of the circuit _3c3 .

Therefore, both input terminals of the open-side AND circuit _3c1 become Hi, and output to the open drive transistor _3c9 to turn it on.

When the opening driving transistor _3c9 turns on, the driving current I starts flowing from the battery 5, which is the driving current, to the operating coil _4a1 of the latching solenoid 4a, which will be described later, and the driving current I applied to the coil _4a1 opens. It returns to the battery 5 via the driving transistor _3c9 and the resistor R.

At this time, the voltage generated in the open driving transistor 3c ₉ is detected by the voltage detection circuit 3c ₁₀ , and this detected voltage is sent to the peak detection circuit 3c ₁₁ , the margin addition circuit 3c ₁₂ , the bottom detection circuit 3c ₁₃ , and the margin subtraction circuit 3c ₁₄ . Output.

Also, the Q output of the above flip-flop _3c6 is
When it becomes Hi, the peak detection circuit 3c ₁₁ starts operating, but since the output is Low, the bottom detection circuit 3c ₁₃ starts operating.
operation remains in a stopped state.

On the other hand, as shown in FIG. 5, the time vs. current characteristic when the latching solenoid 4a is energized, which will be described later, shows that when the operating coil 4a ₁ or the return coil 4a ₂ starts to be energized, the current increases due to the current applied to the coil. Then, after a predetermined period of time, the current decreases once due to the generation of back electromotive force as the plunger _4a3 moves, but the back electromotive force becomes 0 when the valve section _4a4 is opened or closed, so the current decreases from then on. It was found that the time required for the current to drop once the current starts to flow and then to start rising again is within about 10 milliseconds at the longest estimate.

The peak detection circuit _3c11 detects the maximum current value due to the current applied to the operating coil _4a1 , and outputs the maximum current value to the peak detection ON comparator _3c15 .

The peak detection ON comparator _3c15 compares the maximum current value with the output obtained from the margin addition circuit 3c12, which adds a predetermined margin to the current waveform when the latching solenoid _4a is energized, and calculates the output value obtained from the circuit _3c12 . When the output output exceeds the maximum current value and becomes smaller, at that point the flip-flop 3c ₆
Output to clear.

When the clear signal of the flip-flop 3c ₆ is input, the Q output goes low and the peak detection circuit 3c ₁₁
At the same time, the output becomes Hi and the bottom detection circuit _3c13 starts operating.

The bottom detection circuit 3c ₁₃ only tracks low voltage, and detects the current minimum value when the valve portion 4a ₁ is open, that is, the back electromotive force is 0, and turns the current minimum value into a bottom detection ON state.
output to comparator _3c16 .

The bottom detection ON comparator 3c ₁₆ compares the above current minimum value with the output obtained from the margin subtraction circuit 3c ₁₄ , which is obtained by subtracting a predetermined margin from the current waveform when the latching solenoid _4a is energized. When the output increases beyond the current minimum value, at that point the flip-flop 3c ₅
Output to clear.

When the clear signal of flip-flop _3c5 is input, the output goes low and the open side is output from AND circuit _3c8 .
In order to output a Low signal to the AND circuit 3c ₁ , the open driving transistor 3c ₉ is turned off, and the supply of the driving current I from the battery 5 to the operating coil 4a ₁ is stopped.

Note that while the open drive transistor _3c9 is in the ON state, due to some abnormality, the output obtained from the margin addition circuit _3c12 does not exceed the current maximum value, or the margin subtraction circuit 3
There may be cases in which the output obtained from _c14 is not large enough to exceed the minimum current value, and in these cases, there is no input to clear the flip-flop _3c5 , so the open drive transistor _3c9 remains on and the battery 5 The current supply to the operating coil _4a1 is not stopped and the current is turned off.

However, even if such an abnormal state occurs, the 50 msec one-shot timer _3c7 times out 50 msec after the input to the drive circuit 3c becomes Hi, and the Q output becomes Low and the output from the AND circuit _3c8 . switches from Hi to Low, the open drive transistor _3c9 turns OFF, stopping power supply from the battery 5 to the operating coil _4a1 , and furthermore, since the output becomes Hi, the output from the NAND circuit _3c17 becomes Low. The abnormal condition is notified to the user by lighting the inoperable lamp _3c18 .

Then, a pulse signal is generated from the one-shot pulse circuit _3b7 based on the output from the shift register _3b6 , and this pulse signal changes the output from the flip-flop _3b4 to the drive circuit 3c from Hi to high.
When switched to Low, Low is input to one input terminal of the open-side AND circuit 3c ₁ , Hi is input to one input terminal of the closed-side AND circuit 3c ₃ via the NOT circuit 3c ₂ , and exclusive logic A pulse signal is output from the sum circuit _3c4 to flip-flops _3c5 , _3c6 and a 50 msec one-shot timer _3c7 .

Therefore, the closed-side AND circuit _3c3 has both input terminals
It becomes Hi and outputs to the closing drive transistor _3c19 , turning it on.

When the closing drive transistor _3c19 is turned on, a drive current I starts flowing from the battery 5 to a return coil _4a2 of a latching solenoid 4a, which will be described later.

After that, the open drive transistor 3c ₉ described above
Similarly, the return coil 4 is activated by the peak detection circuit 3c ₁₁ .
The peak detection ON comparator _3c15 compares the current maximum value obtained by applying current to _a2 and the margin addition output obtained from the margin addition circuit _3c12 , and when the margin addition output exceeds the current maximum value and becomes smaller, At that point, the flip-flop _3c6 is cleared, and the bottom detection circuit _3c13 is used to clear the valve part _4a4.
Compare the current minimum value obtained when the valve closes with the margin subtraction output obtained from the margin subtraction circuit 3c ₁₄ using the bottom detection ON comparator 3c ₁₆ , and when the margin subtraction output exceeds the current minimum value, the By clearing the flip-flop _3c5 and turning off the closing drive transistor _3c19 , the supply of the drive current I from the battery 5 to the recovery coil _4a2 is stopped.

A time chart of such a drive circuit 3c is shown in FIG.

The water supply section 4 includes a latching solenoid 4a shown in FIGS. 7 and 8, and this latching solenoid 4.
A flash valve 4b that opens and closes according to the operation of a.
In this embodiment, a flush valve 4b is provided in the water supply channel 6a that communicates the water supply source and the urinal 1a, and a pressure chamber is defined within the flush valve 4b. A latching solenoid 4a is provided in a branch flow path 6b that communicates with the secondary side of the flush valve.

The latching solenoid 4b is made of metal case 4
A ₅ has an annular operating coil 4a ₁ and a return coil 4a ₂ stacked vertically, and these coils 4
A permanent magnet 4a ₆ is placed between _{a 1} and 4a ₂ in contact with the inner surface of the case 4a ₅ , and a first fixed iron core 4a ₇ is placed inside the operating coil 4a ₁ , and a first fixed iron core 4a 7 is placed inside the return coil 4a ₂ . The second fixed iron cores 4a and ₈ are inserted and attached to the upper and lower surfaces of the cases 4a _{and 5} , respectively.

A plunger 4a 3 is disposed inside the permanent magnet 4a ₆ so as to be movable up and down, and the plunger 4a ₃ is always moved in the valve-closing direction, that is, downward, between the upper surface of the plunger 4a ₃ and the lower surface _{of the first fixed iron core 4a 7 .} Spring 4 to press
A ₉ is loaded therein, and a valve body 4a ₁₀ is integrally provided on the lower surface of the plunger 4a ₃ to open and close the valve portion 4a ₄ by vertically movably passing through the second fixed iron core 4a ₈ .

To explain the operation of the latching solenoid 4a, normally when the user is not detected, the plunger 4 is activated by the spring 4a ₉ .
By compressing a ₃ downward, the valve portion 4a ₄ is closed and the branch flow path 6b is closed, and the permanent magnet 4a ₆ at this time
The magnetic flux flows from the inside of the magnet 4a ₆ to the plunger 4a ₃ ,
Permanent magnet 4 via second fixed iron core 4a ₈ and case 4a ₅
A circulation path is formed to return to _a6 , and the plunger _4a3 continues to move downward, that is, maintains the closed state shown in FIG.

In this state, if we energize the operating coil 4a ₁ now,
A magnetic flux is generated that tries to attract the plunger 4a ₃ upward, and this magnetic flux gradually becomes stronger. For example, within about 10 milliseconds after the operation coil 4a ₁ starts to be energized, the plunger 4a ₃ starts to move upward and a back electromotive force is generated. As this occurs, the valve portion 4a ₁₀ moves upward accordingly, thereby opening the valve portion 4a ₄ , and the counter electromotive force becomes zero. When the valve part 4a ₄ opens, the flash valve 4
Water in the pressure chamber b is discharged to the secondary side of the flash valve 4b via the branch flow path 6b.

Thereafter, the plunger _4a3 continues to move upward, compressing the spring _4a9 , and finally the upper surface of the plunger _4a3 comes into contact with the lower surface of the first fixed iron core _4a7 .

At this time, the magnetic flux of the permanent magnet 4a ₆ forms a circulation path from the inside of the magnet 4a ₆ to the outside of the permanent magnet 4a ₆ via the plunger 4a ₃ , the first fixed iron core 4a ₇ , and the case 4a ₅ , and the plunger 4a ₃ It remains attracted to the first fixed iron core _4a7 , that is, maintains the valve open state shown in FIG. 8.

In addition, in order to change the valve from the open state to the closed state again, when the return coil 4a ₂ is energized, the plunger 4a ₃
A magnetic flux is _generated that attempts to attract _{the .} A counter electromotive force is generated for the first time, and along with this, the valve body 4a ₁₀
When the valve moves downward, the valve portion _4a4 closes, and the electromotive force becomes zero. When the valve portion _4a4 opens, the outflow of water from the pressure chamber of the flush valve 4b is stopped.

The flush valve 4b has a conventionally well-known structure, and defines a pressure chamber behind a main valve section that is movably disposed inside the flash valve 4b, and when the water in the pressure chamber decreases, the main valve body moves toward the pressure chamber side. The valve opens by gradually moving to the water supply flow path 6a, and the cleaning water from the water supply source is transferred to the water supply flow path 6a.
When water is supplied to the urinal 1a through the urinal 1a, and when the outflow of water in the pressure chamber is stopped, water gradually begins to flow into the pressure chamber from a small passage opened in the main valve body, and as a result, the main valve As the body moves little by little in the direction of closing the valve, the valve finally closes, and the urinal 1
Stop the water supply to a.

Incidentally, in the above embodiment, the water washer 1 is the urinal 1.
Although the case of case a is shown, the washing machine 1 is not limited to this, and for example, as shown in FIG. 9, the washing machine 1 may be a hand washing machine 1b.

In this case, a sensing unit 2 is installed on the wall W of the rear upper surface of the handwash basin 1b, and when the sensing unit 2 detects a user approaching the handwash basin 1b to wash their hands, the water supply unit 4 is energized and water is discharged. Start water supply from tool 1b ₁ ,
When the user leaves the hand wash basin 1b after washing his hands, the water supply is stopped.

Furthermore, in the embodiment described above, the sensing section 2 is connected to the wall surface W.
Although the sensing section 2 is installed in an embedded manner, the mounting structure of the sensing section 2 is not limited to that shown in the drawings and may be any structure.

<Effects of the Invention> Since the present invention has the above configuration, it has the following advantages.

The period of infrared light that is emitted intermittently from the light emitting element is shortened when the user is detected, and lengthened when the user is not detected for a set period of time, and the period is then set to not detect the user. As the time continues, it becomes even longer, so the conventional constant 1
Compared to a sensor equipped with a sensor that emits infrared rays several thousand times per second, the number of infrared rays emitted can be reduced without significantly reducing response accuracy.
Power consumption can be reduced accordingly.

Therefore, the life of the battery is extended, and there is no need to frequently replace the battery, which not only provides an economical advantage of significantly reducing maintenance costs, but also greatly reduces the effort required to replace the battery.

Since the light projection cycle is short when the sensing part is sensing a human body, the water supply part can be driven immediately after the user is gone.

[Brief explanation of drawings]

Fig. 1 is a longitudinal side view of a water supply control device showing an embodiment of the present invention, Fig. 2 is a block diagram of a sensor circuit and a control circuit, Fig. 3 is a time chart of the same, and Fig. 4 is a block diagram of a drive circuit. , Figure 5 is a graph showing the time vs. current characteristics when energizing the latching solenoid, Figure 6 is a time chart of the drive circuit,
FIG. 7 is an enlarged longitudinal sectional view of the latching solenoid, showing the valve in the closed state, and FIG. 8 is an enlarged longitudinal sectional view of the latching solenoid, showing the valve in the open state.
FIG. 9 is a partially cutaway front view showing a case where the water washer is a hand wash basin. DESCRIPTION OF SYMBOLS 1...Washer, 2...Sensing unit, 2a...Light emitter, 2b...Light receiving element, 3...Control unit, 4...Water supply unit, 5...Battery.

Claims (1)

[Claims] 1 A water washer, a sensing part that detects the use of the water washer, a control part that outputs an opening/closing signal to the water supply part based on a sensing signal from the sensing part, and a valve that opens and closes based on the opening/closing signal from the control part. In the water supply control device, which is equipped with a water supply unit and uses a battery as a driving power source, the sensing unit is constituted by an infrared sensor having a light emitting element and a light receiving element, and the infrared light emitted from the light emitting element is intermittently emitted at a predetermined period. In addition, the light emitting cycle when the user is not detected for a set time is made longer than the light emitting cycle when the user is detected, and then when the user is not detected for the set time A water supply control device characterized by further lengthening the light emission period.