JP4968128B2 - Automatic faucet device - Google Patents

Description

  The present invention relates to an automatic faucet device that automatically flows water from a water outlet.

  Conventionally, in an automatic water faucet device, an electromagnetic valve, a control circuit that opens and closes the electromagnetic valve to control water supply, an object detection sensor that inputs a control signal to the control circuit, and an object detection sensor emit light intermittently A light-emitting element and a light-receiving element that receives reflection of light from a detection object (for example, a user's hand), and the control circuit detects the detection object when the light-receiving element receives a predetermined amount or more of light. In some cases, the electromagnetic valve is opened to discharge water from the water outlet of the faucet case (see, for example, Patent Document 1).

In addition, there is one that emits light from an illumination lamp from the vicinity of a water outlet of a faucet case to exhibit an illumination effect (see, for example, Patent Document 2).
JP-A-4-2924 JP 2002-266393 A

  In the case where the automatic faucet device of Patent Document 1 and the faucet fitting of Patent Document 2 are combined so that the illumination lamp is turned on when the electromagnetic valve is opened to exhibit the illumination effect, the light emitting element In addition to the light receiving element, an illumination lamp is required, and the number of parts increases.

  An object of this invention is to provide the automatic water tap apparatus which suppressed the increase in the number of parts in view of the said point.

In order to achieve the above object, in the invention according to claim 1, a valve (12) for opening and closing a water supply pipe (11) for flowing water toward the water outlet (20),
A light emitting element (16) for emitting light;
First control means (S100, S110, S120, S130, S140, S250) for controlling the light emitting element so that the light is emitted intermittently;
A light receiving element (17) for receiving reflected light of the light emitted from the light emitting element with respect to a detection target;
First determination means (S140, S150, S160, S230, S231) for determining whether or not a detection target exists in the vicinity of the spout by determining whether or not reflected light is received by the light receiving element. , S232),
When the first determination means determines that there is an object to be detected around the water outlet, the valve is opened to discharge water from the water supply pipe through the water outlet, and around the water outlet. Second control means (S180, S234) for closing the valve and stopping discharging water from the water outlet when the first determination means determines that there is no object to be detected; An automatic faucet device comprising:
The light emitting element emits visible light as the light,
When the first determination unit determines that the detection target exists around the water outlet, compared to when the first determination unit determines that the detection target does not exist around the water discharge port. And a third control means (S190, S200, S210, S220, S220, S220, S220, S220, S220, S220, S220, S220, S220, S220, S220, S220, S220, S220, S220, S220). S230, S240).

  As a result, when there is an object to be detected around the water outlet, the emitted light can be emitted from the light emitting element as illumination light, so that the illumination effect can be exhibited without using an illumination lamp other than the light emitting element. Can do. Therefore, an increase in the number of parts can be suppressed.

  Here, the third control means is not limited to intermittently lighting the light emitting element, but may be continuously lit.

  In the invention which concerns on Claim 2, when the said 1st determination means determines that the said detection target does not exist in the periphery of the said spout, the ratio of the light emission time with respect to the light emission stop time in the said light emitting element is 4 ppm or less And the light emission time in the said light emitting element is 10 microseconds or less, It is characterized by the above-mentioned.

  Thereby, when there is no detection target around the water outlet, the emitted light of the light emitting element is substantially not visually recognized. Furthermore, the light emission period of general lighting fixtures such as fluorescent lamps is 16 msec to 20 msec and 20 μsec to 100 μsec. By making the light emission time different from this to 10 μsec or less, it is distinguished from illumination light such as fluorescent lamps. This makes it easy to prevent erroneous detection by a fluorescent lamp or the like.

In the invention which concerns on Claim 3, the output part (21) which radiate | emits the water outlet, the emitted light of the said light emitting element to the periphery of the said water outlet, and the light-receiving part which receives the reflected light reflected from the said detection target object A faucet case (19) comprising:
A body casing (10) for housing the light emitting element and the light receiving element, respectively;
A first optical fiber (18a) for guiding outgoing light of the light emitting element to an outgoing part of the faucet case;
A second optical fiber (18b) for guiding reflected light received by the light receiving part of the faucet case to the light receiving element;
It is characterized by providing.

  Thereby, since it becomes unnecessary to house a light emitting element and a light receiving element in the faucet case, the faucet case can be reduced in size.

  The invention according to claim 4 is characterized in that the first and second optical fibers are plastic optical fibers.

  In general, a plastic optical fiber can be bent relatively freely. For this reason, when plastic optical fibers are used as the first and second optical fibers, the degree of freedom of the installation positions of the first and second optical fibers is increased.

  Here, generally, as a plastic optical fiber, the transmittance of light having a wavelength of 600400 nm to 700 nm is good. However, since the sensitivity of a photodiode generally used as a light receiving element is low in the 400 nm to 600 nm band, it is preferable to use the 600 nm to 700 nm band in order to obtain an overall high signal level.

  Therefore, as in the invention according to claim 6, the wavelength of the emitted light of the light emitting element may be 600 nm to 700 nm.

  The invention according to claim 5 includes a control device (15) for executing the first, second, and third control means and the first determination means, respectively, and the control device is housed in the main casing. It is characterized by being.

In the invention which concerns on Claim 7, the brightness sensor which detects the brightness around the said spout,
In the case where the first determination unit determines that the detection target exists in the vicinity of the water outlet, the light emitting element becomes smaller as the lightness around the water outlet is smaller based on the detection value of the lightness sensor. A fourth control means for controlling the light emitting element so as to reduce the ratio of the light emission time to the light emission stop time in
It is characterized by providing.

  In the invention which concerns on Claim 8, when the said 1st determination means determines that the said detection target exists in the circumference | surroundings of the said spout, the night of the light emission time with respect to the light emission stop time in the said light emitting element compared with the daytime A fourth control means for controlling the light emitting element so as to reduce the ratio is provided.

  In addition, the code | symbol in the bracket | parenthesis of each means described in a claim and this column shows the correspondence with the specific means as described in embodiment mentioned later.

(First embodiment)
FIG. 1 shows an overall view of an illuminated automatic faucet device according to a first embodiment of the present invention.

  The illuminated automatic faucet device includes a main body casing 10a. A water supply pipe 11 passes through the main body casing 10a. A water pipe is connected to the inlet side of the water supply pipe 11. An outlet side of the water supply pipe 11 is connected to a discharge port of the faucet case 19 via a water supply hose 14.

  An electromagnetic valve 12 is disposed in the main body casing 10. The electromagnetic valve 12 is a valve body that opens and closes between the inlet side and the outlet side of the water supply pipe 11.

  A generator 13 is disposed in the main body casing 10. The generator 13 is arranged in series with respect to the water supply pipe 11. The generator 13 is disposed on the downstream side of the water flow in the water supply pipe 11 with respect to the electromagnetic valve 12. The generator 13 generates electricity by rotating a built-in water wheel by a water flow in the water supply pipe 11.

  The generator 13 of the present embodiment includes a magnet as a rotor coupled to the rotating shaft of the water turbine, and a stator coil disposed on the outer peripheral side in the radial direction of the rotating shaft with respect to this magnet. An induced electromotive force is generated in the stator coil.

  A control device 15 is disposed in the main body casing 10. The control device 15 includes a microcomputer 15a, a storage battery 15b, counters 15c and 15d, a light emitting element 16, a light receiving element 17, and the like.

  As will be described later, the microcomputer 15a performs a lighting process of the light emitting element 16 and a detection target object detection process using the received signal of the light receiving element 17.

  The storage battery 15b is composed of a secondary battery, stores the electric power generated by the generator 13, and the electric power required by the automatic faucet device such as the microcomputer 15a and the light emitting element 16 is stored in the storage battery 15b. It is covered by electric power (that is, electric power generated by the generator 3).

  The light emitting element 16 is a light emitting diode that emits visible light toward the projecting optical fiber 18a. As will be described later, the light emitting element 16 is used as a light source for illuminating the detection target. The wavelength of the emitted light from the light emitting element 16 is 600 nm to 700 nm.

  Here, the use of light having a wavelength in the range of 600 nm nm to 700 nm is because the light emitting diode has good luminous efficiency, the sensitivity of the photodiode used in the light receiving element described later, and the transmittance with respect to the plastic optical fiber. Because it is good.

  The light projecting optical fiber 18 a is disposed between the light emitting element 16 and the emission part 21 of the faucet case 19. The light projecting optical fiber 18 a guides the light emitted from the light emitting element 16 to the light emitting portion 21 of the faucet case 19.

  The light receiving element 17 is composed of a photodiode or the like, receives light guided by the light receiving optical fiber 18b, and outputs a detection signal. As the light receiving element 17, an element having a high sensitivity in the vicinity of a wavelength of 650 nm is used.

  Thereby, matching between the wavelength sensitivity characteristic of the light receiving element 17 and the outgoing light wavelength characteristic of the light emitting element 16 can be achieved. The light receiving circuit (not shown) is a circuit in which a band pass filter and an amplifier are combined so as to have a high amplification factor with respect to a signal in the vicinity of 1 μsec (frequency 1 MHz).

  The light receiving optical fiber 18 b is disposed between the light receiving element 17 and the light receiving portion 22 of the faucet case 19, and the light receiving optical fiber 18 b guides light received by the light receiving portion 22 to the light receiving element 17.

  As the optical fibers 18a and 18b of the present embodiment, plastic optical fibers are used. The reason is that it is inexpensive and can withstand bending of a small diameter so that it can be freely stored in a small faucet case.

  The faucet case 19 is attached to a wall 30 such as a washroom. The faucet case 19 is formed so as to protrude from the wall 30. On the front end side of the faucet case 19, a water outlet 20, an emitting part 21, and a light receiving part 22 are provided.

  The water discharge port 20 is a water discharge port that discharges water flowing from the water supply pipe 11 through the water supply hose 14. The emitting unit 21 irradiates the emitted light of the light emitting element 16 guided through the light projecting optical fiber 18a downward. The light receiving unit 22 receives reflected light of the light emitted from the light emitting element 16 with respect to the detection target and outputs a detection signal.

  The fibers 18 a and 18 b are disposed between the faucet case 19 and the control device 15 through the hole 30 a of the wall 30 together with the water supply hose 14.

  Next, the operation of the control device 15 of the present embodiment will be described with reference to FIGS. 2 and 3 are flowcharts showing the control processing of the control device 15.

  The control device 15 executes the computer program according to the flowcharts of FIGS. 2 and 3, the light emitting element 16 is referred to as an LED.

  First, in step S100, the light emitting element 16 is turned off. Thereafter, in step S110, the process waits for 0.25 sec. As a result, the light-emitting element 16 is continuously turned off for 0.25 sec.

  Next, in step S120, the light emitting element 16 is turned on. Thereafter, in step S130, the process waits for 1 μsec. Thereby, the lighting of the light emitting element 16 is continued for 1 μsec. For this reason, the emitted light of the light emitting element 16 is emitted from the emitting portion 21 of the faucet case 19 through the light projecting optical fiber 18a.

  Thereafter, in step S140, it is determined whether or not a detection signal is output from the light receiving element 17. That is, it is determined whether or not the light receiving unit 22 of the faucet case 19 has received the reflected light of the light emitted from the light emitting element 16 with respect to the detection target.

  Here, in step S140, when the detection signal is not output from the light receiving element 17, it determines with NO.

  That is, it is determined that there is no detection target around the water outlet 20 of the faucet case 19 and the detection target is in a non-detection state.

  Accordingly, in step S250, the count value of the counter 15c is cleared. The detection counter 15c counts the number of times that the determination is YES because the detection signal is detected in step S140. Hereinafter, the counter 15c is referred to as a detection counter 15c.

  Thereafter, the process returns to step S100, and the determination of NO in steps S100, S110, S120, S130, and S140 and the process of step S250 are repeated until it is determined as YES in step S140.

  As a result, the light emitting element 16 is intermittently turned on in a normal cycle (see FIG. 4). When the light emitting element 16 is intermittently lit, if the light emission time Ton of the light emitting element 16 is 1 μsec and the light emission stop time Toff of the light emitting element 16 is 0.25 sec, the light emission time ratio H of the light emission time on to the light emission stop time Toff is H. (= Ton / Toff) is 4 ppm.

  When the light emitting element 16 is intermittently turned on in this way, the emitted light of the light emitting element 16 is guided to the emitting part 21 of the faucet case 19 by the light projecting optical fiber 18a, and the guided light is emitted from the emitting part 21. Exit.

  At this time, the palm of the user approaches the spout 20 of the faucet case 19, the light emitted from the light emitting element 16 is reflected by the palm, and a part of the reflected light is received by the light receiving unit 22. Then, the received light is guided to the light receiving optical fiber 18 b and received by the light receiving element 17, and a detection signal is output from the light receiving element 17.

  At this time, in step S140, it is determined as YES because the detection signal is output from the light receiving element 17. Along with this, the count value of the detection counter 15c is incremented.

  In the next step S160, it is determined whether or not the count value of the detection counter 15c is “2”. Here, when the count value of the detection counter 15c is not “2” (count value ≠ 2), it is determined as NO and the process returns to step S100.

  After that, when the process proceeds to step S150 through the respective YES determination processes of steps S100, S110, S120, S130, and S140, the count value of the detection counter 15c is incremented to become “2”. Then, in the next step S160, when the count value of the detection counter 15c is “2”, it is determined that the detection target is detected in the vicinity of the water outlet 20 of the faucet case 19, and YES is determined.

  That is, it is determined that the palm of the user, that is, the detection target exists in the vicinity of the spout 20 of the faucet case 19.

  Accordingly, the electromagnetic valve 13 is opened in step S180 of FIG. For this reason, tap water from the water pipe flows through the water supply pipe 11 through the water supply hose 14 toward the discharge port 20 of the faucet case 19, and the flowing tap water is discharged from the discharge port 20. At this time, the generator 13 generates electric power by the water flow in the water supply pipe 11, and stores the electric power in the storage battery 15b.

  Next, in step S190, the light emitting element 16 is turned off. Thereafter, in step S200, the apparatus waits for 0.1 msec. Thereby, the extinction of the light emitting element 16 is continued for 0.1 msec.

  Next, in step S210, the light emitting element 16 is turned on. Thereafter, in step S220, the process waits for 1 μsec. Thereby, the lighting of the light emitting element 16 is continued for 1 μsec. For this reason, the emitted light of the light emitting element 16 is emitted from the emitting portion 21 of the faucet case 19 through the light projecting optical fiber 18a. Thereafter, in step S230, it is determined whether or not a detection signal is output from the light receiving element 17.

  At this time, if it is determined as YES in step S230 that the detection signal is output from the light receiving element 17, the count value of the counter 15d is cleared in step S240.

  The counter 15d counts the number of times that NO is determined in step S230 as no detection signal is detected. Hereinafter, the counter 15d is referred to as a non-detection counter 15d.

  Thereafter, returning to step S190, as long as a detection signal is output from the light receiving element 17, the YES determinations of steps S190, S200, S210, S220, and S230, and the processes of S240 are repeated.

  Thereby, the light emitting element 16 is intermittently turned on in a short cycle (see FIG. 4). In such intermittent lighting of the light emitting element 16, if the light emission time Ton of the light emitting element 16 is 1 μsec and the light emission stop time Toff of the light emitting element 16 is 100 μsec, the light emission time ratio To of the light emission time Ton with respect to the light emission stop time Toff (= (Ton / Toff) is 1%. That is, the light emission time ratio H is larger than before it is determined as YES in Step 160.

  Thus, the light emitting element 16 emits illumination light intermittently, so that the vicinity of the water discharge port 20 of the faucet case 19 is illuminated.

  Thereafter, when the user's palm is separated from the vicinity of the spout 20 of the faucet case 19, the light emitted from the light emitting element 16 is not reflected by the palm. For this reason, the reflected light is not received by the light receiving unit 22, and no detection signal is output from the light receiving element 17.

  For this reason, if NO is determined in step S230 that the detection signal is not output from the light receiving element 17, the count value of the non-detection counter 15d is incremented in step S231.

  In the next step S232, it is determined whether or not the count value of the non-detection counter 15d is “2”. Here, when the count value of the non-detection counter 15d is not “2” (count value ≠ 2), NO is determined, and the process returns to step S190.

  Thereafter, when the NO determinations in steps S190, S200, S210, S220, and S230 and the processes in step S231 are completed, the process proceeds to step S232.

  In this step S232, when the count value of the non-detection counter 15d is “2” (count value = 2), it is determined as YES. Next, the count value of the non-detection counter 15d is cleared in step S233, and the electromagnetic valve 12 is closed in step 234. For this reason, tap water from the water pipe does not flow from the water supply pipe 11 to the outlet 20 side of the faucet case 19. Along with this, the power generation of the generator 13 is stopped.

  Thereafter, the process returns to step S100, and the determination of NO in steps S100, S110, S120, S130, and S140 and the process of step S250 are repeated until it is determined as YES in step S140. As a result, the light emitting element 16 is intermittently turned on at a normal cycle. Thereby, the light emitting element 16 stops emitting the illumination light.

  According to the present embodiment described above, when there is a detection object (such as a user's hand) around the water outlet 20 of the faucet case 19, the faucet case 19 uses the emitted light from the light emitting element 16 as illumination light. It can radiate | emit from the output part 21 of this.

  In this embodiment, when it is determined NO in step S140 because there is no detection target around the water outlet 20 of the faucet case 19, the light emission time ratio H of the light emission time Ton with respect to the light emission stop time Toff (= Ton / Toff) is 4 ppm, and the light emission time Th is 1 μsec.

  According to the experiments and examinations by the present inventors, when the light emission time ratio H is 4 ppm or less and the light emission time Ton is 10 μsec or less, the light emitted from the light emitting element 16 does not give the user a sense of incongruity. It turned out that it was in the state which is not visually recognized by the person.

  As described above, when there is no detection target around the water outlet 20 of the faucet case 19, the light emission time ratio H (= Ton / Toff) is 4 ppm and the light emission time Ton is 1 μsec. For this reason, the light emitted from the light emitting element 16 is substantially not visually recognized.

  On the other hand, when a detection target (such as a user's hand) exists around the water outlet 20 of the faucet case 19, the emitted light is visually recognized from the light emitting element 16.

  Therefore, the illumination effect can be exhibited without using an illumination lamp other than the light emitting element 16. Therefore, an increase in the number of parts in the illuminated automatic faucet device can be suppressed. In addition, an inexpensive automatic water faucet can be provided.

In the present embodiment, the light emitting element 16 and the light receiving element 17 are housed in the main body casing 10, the light projecting optical fiber 18 a is disposed between the light emitting element 16 and the light emitting part 21 of the faucet case 19, and further receives light. A light receiving optical fiber 18 b is disposed between the element 17 and the light receiving portion 22 of the faucet case 19. Therefore, the parts accommodated in the faucet case 19 can be reduced. For this reason, size reduction can be achieved with respect to the faucet case 19.
(Second Embodiment)
In the first embodiment, the light emitting element and the light receiving element are housed in the main body casing, and the light projecting fiber and the light receiving optical fiber are disposed between the main body casing and the faucet case. Instead, in the second embodiment, the light emitting element and the light receiving element are accommodated in the faucet case.

  The configuration in this case is shown in FIG. In FIG. 5, the same reference numerals as those in FIG.

  In the present embodiment, the light emitting element 16 and the light receiving element 17 are accommodated in the faucet case 19. The light emitting element 16 emits visible light directly from the emitting portion 21 of the faucet case 19. The light receiving element 17 receives reflected light from the detection target incident on the light receiving portion 22 of the faucet case 19.

  Further, a lead wire 23 a is connected between the light emitting element 16 and the control device 15, and a lead wire 23 b is connected between the light receiving element 17 and the control device 15. The lead wires 23 a and 23 b are disposed between the faucet case 19 and the control device 15 through the hole 30 a of the wall 30.

  According to the present embodiment described above, it is not necessary to separately provide an illumination lamp in addition to the light emitting element 16, so that the faucet case 19 can be reduced in size and slim.

(Other embodiments)
In the first embodiment described above, the light emission time ratio H (= Ton / Toff) is maintained with the intermittent lighting of the light emitting element 16 after determining YES in Step S140 that the detection signal is output from the light receiving element 17. In this example, the light emission time ratio H (= Ton / Toff) may be increased by continuously lighting the light emitting element 16.

  In the first and second embodiments described above, when it is determined as YES in step 160 that there is an object to be detected around the water outlet 20 of the faucet case 19, as a fourth control means, it is daytime at night. Compared to the above, the light emission time ratio To of the light emission time Ton relative to the light emission stop time Toff in the light emitting element 16 may be lowered to lower the brightness of the projection light near the water outlet 20.

  Here, the determination of day and night may be made by adding a clock function to the microcomputer 15a and determining the time by this clock function.

  It may replace with this and may discriminate | determine day and night using the brightness sensor which detects the brightness of the periphery of the spout 20 of the faucet case 19. That is, the light emitting element 16 is controlled so that the light emission time ratio H decreases as the brightness around the water discharge port 20 is smaller.

  In the first and second embodiments described above, the example in which the light emission period when the light emitting element 16 is turned on as illumination light is about 10 kHz is shown. However, the present invention is not limited to this, and the light emitting element 16 has a light emission period other than about 10 kHz. May be turned on intermittently. In this case, it is desirable to set the light emission period to several tens Hz to several tens kHz in order not to give the user a flickering feeling of illumination light.

  Hereinafter, the correspondence relationship between the above embodiment and the configuration of the scope of the claims will be described. Each process of steps S100, S110, S120, S130, S140, and S250 constitutes a first control unit, and step S180, The process of S234 constitutes the second control means, and the processes of steps S190, S200, S210, S220, S230, and S240 constitute the third control means.

It is a figure which shows the whole automatic faucet device with illumination of 1st Embodiment of this invention. It is a flowchart which shows a part of control processing of the control apparatus of FIG. It is a flowchart which shows the remainder of the control processing of the control apparatus of FIG. It is a timing chart which shows lighting of the light emitting element of FIG. 1, and light reception of the light receiving element. It is a figure which shows the whole automatic faucet device with illumination of 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Main body casing 11 Water supply pipe 12 Solenoid valve 13 Generator 15 Control apparatus 15a Microcomputer 15b Storage battery 15c Counter 15d Counter 16 Light emitting element 17 Light receiving element 18a Light emitting optical fiber 18b Light receiving optical fiber 19 Water faucet case 20 Water outlet 21 Outlet Part 22 Light-receiving part

Claims (8)

A valve (12) for opening and closing a water supply pipe (11) for flowing water toward the water outlet (20);
A light emitting element (16) for emitting light;
First control means (S100, S110, S120, S130) for controlling the light emitting element so as to emit the light intermittently;
A light receiving element (17) for receiving reflected light of the light emitted from the light emitting element with respect to a detection target;
First determination means (S140, S150, S160, S230, S231) for determining whether or not a detection target exists in the vicinity of the spout by determining whether or not reflected light is received by the light receiving element. , S232),
When the first determination means determines that there is an object to be detected around the water outlet, the valve is opened to discharge water from the water supply pipe through the water outlet, and around the water outlet. A second control unit (S180, 234) for closing the valve and stopping discharging water from the water outlet when the first determination unit determines that there is no detection object; An automatic faucet device comprising:
The light emitting element emits visible light as the light,
When the first determination unit determines that the detection target exists around the water outlet, compared to when the first determination unit determines that the detection target does not exist around the water discharge port. And a third control means (S190, S200, S210, S220) for increasing the ratio of the light emission time to the light emission stop time in the light emitting element to control the light emitting element to emit the emitted light as illumination light. An automatic faucet device comprising:   When the first determination unit determines that the detection target does not exist around the water outlet, the ratio of the light emission time to the light emission stop time in the light emitting element is 4 ppm or less, and the light emission in the light emitting element 2. The automatic water faucet device according to claim 1, wherein the time is 10 [mu] sec or less. Water having the water outlet, an emitting part (21) for emitting the light emitted from the light emitting element to the periphery of the water outlet, and a light receiving part (22) for receiving the reflected light reflected from the detection object. Plug case (19);
A body casing (10) for housing the light emitting element and the light receiving element, respectively;
A first optical fiber (18a) for guiding outgoing light of the light emitting element to an outgoing part of the faucet case;
A second optical fiber (18b) for guiding reflected light received by the light receiving part of the faucet case to the light receiving element;
The automatic faucet device according to claim 1 or 2, further comprising:   The automatic faucet device according to any one of claims 1 to 3, wherein the first and second optical fibers are plastic optical fibers.   The automatic faucet according to claim 3, wherein a control device (15) having the first, second and third control means and the first determination means is housed in the main casing. apparatus.   The automatic faucet device according to any one of claims 1 to 5, wherein a wavelength of light emitted from the light emitting element is 600 nm to 700 nm. A brightness sensor for detecting the brightness around the spout;
In the case where the first determination unit determines that the detection target exists in the vicinity of the water outlet, the light emitting element becomes smaller as the lightness around the water outlet is smaller based on the detection value of the lightness sensor. A fourth control means for controlling the light emitting element so as to reduce the ratio of the light emission time to the light emission stop time in
The automatic faucet device according to any one of claims 1 to 6, further comprising:   In the case where the first determination unit determines that the detection target exists in the vicinity of the water outlet, the light emitting element is configured to lower the ratio of the light emission time to the light emission stop time in the light emitting element at night compared to the daytime. The automatic faucet device according to any one of claims 1 to 7, further comprising a fourth control means for controlling

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