JP2006046006A - Automatic faucet and washing system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an automatic faucet and a washing system equipped with the automatic faucet capable of performing stable operation even in the automatic faucet with a sensor unit circuit integrated in high density. <P>SOLUTION: The automatic faucet is provided with a spout; a water discharge port provided at the spout; a sensor unit provided in juxtaposition with the water discharge port: a solenoid valve for controlling opening/closing of a water passage leading to the water discharge port; a control part for controlling the operation of the solenoid valve based on output signals from the sensor unit; and a connecting line for connecting the spout to the earth. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an automatic faucet and a washing system, and more particularly to an automatic faucet having a sensor unit built in a spout and a washing system equipped with the automatic faucet.

  The automatic faucet that discharges water only while the user puts out a hand using a sensor is not only convenient, but also hygienic because it is non-contact type, and `` forget to close '' Since the water-saving effect by eliminating this is high, it is becoming widespread (for example, Patent Document 1).

Such an automatic water faucet can be easily attached to a washstand and has a clean appearance by incorporating a sensor such as an infrared ray in a spout that accommodates the connecting hose.
FIG. 25 is a partial schematic cross-sectional view showing a wash basin provided with an automatic faucet that has been conventionally used.

  That is, the spout 12 is installed in the wash basin 11, and the water supplied through the connection hose can be discharged to the bowl surface. A light emitting element 21 and a light receiving element 22 are provided in the vicinity of the tip of the spout 12 together with the water supply port 13. On the other hand, a control box 3 is installed under the washstand 11, and a drive circuit for the light emitting element 21, a receiving circuit for the light receiving element 22, a control circuit for the electromagnetic valve, and the like are accommodated therein. For example, an LED (light emitting diode) that emits infrared light is used as the light emitting element 21, and a photodiode or a phototransistor that detects the infrared light can be used as the light receiving element 22.

When the user puts out his hand, detection light such as infrared rays emitted from the light emitting element 21 is reflected, and the light receiving element 22 detects this reflected light and starts water discharge from the water supply port 13.
JP-A-6-2348

  However, when only the light emitting element 21 and the light receiving element 22 are incorporated in the spout 12 and an analog signal is input / output to / from the control box 3, it is necessary to use a shielded wire in order to cope with external noise and the like. Since the number of signal lines increases, it is disadvantageous in terms of slimming the spout and cost.

  On the other hand, the present inventor has developed a sensor unit that integrates a light emitting element or a light receiving element and a signal processing circuit and can be incorporated in a spout. This sensor unit also has a built-in analog / digital conversion circuit, drives the light-emitting element with an external digital signal, converts the analog output from the light-receiving element into a digital signal, and is installed under the washbasin etc. To the output. By inputting and outputting with a digital signal, a shielded wire or the like is not necessary, and the number of wires can be reduced.

  However, in order to accommodate the sensor unit in a limited space such as a spout, it is necessary to integrate and mount light emitting elements, light receiving elements, circuit boards, and the like. For this reason, it has been found that there is a problem that the breakdown voltage is reduced against static electricity (surge), and malfunction and failure are likely to occur.

  The present invention has been made on the basis of recognition of such a problem, and an object thereof is to have a high withstand voltage against static electricity and enable a stable operation even in an automatic water faucet provided with a sensor unit integrated at high density. An object of the present invention is to provide an automatic faucet and a washing system equipped with the automatic faucet.

  In order to achieve the above object, according to one aspect of the present invention, a spout, a spout provided in the spout, a sensor unit built in the spout and including a sensor and a signal processing circuit, and the spout A solenoid valve that controls the opening and closing of the water passage leading to the control circuit, a control unit that controls the operation of the solenoid valve based on an output signal from the sensor unit, and a connection path that connects the spout to ground. An automatic faucet is provided.

  According to the above configuration, by grounding the spout, even if electrostatic noise is applied from the outside, it can be immediately discharged to the ground. As a result, it is possible to provide an automatic faucet capable of stable operation even when the sensor units are integrated at a high density.

Alternatively, the spout can be reliably and easily grounded even if the connection path is connected to the electromagnetic valve.
Or it is further provided with a connection hose made of a conductive material and connecting the water outlet and the solenoid valve, and the connection path reliably connects the spout and the connection hose even if the spout is connected to the ground. Can do.
Alternatively, the spout can be reliably grounded even if the connection path is connected to a stop cock connected to the primary side of the electromagnetic valve.

  Further, according to another aspect of the present invention, a spout made of an insulating material, a water outlet provided in the spout, a sensor unit that is built in the spout and includes a sensor and a signal processing circuit, and There is provided an automatic water faucet comprising: an electromagnetic valve that controls opening and closing of a water passage leading to a water outlet; and a control unit that controls the operation of the electromagnetic valve based on an output from the sensor unit. The

  When the spout is formed of an insulating material, static noise from the outside can be reliably and easily blocked. As a result, it is possible to provide an automatic faucet capable of stable operation even when the sensor units are integrated at a high density. Further, for example, when the spout is formed of resin, the spout can be easily deformed, and water can be discharged at a user's favorite angle or direction.

  Here, if the signal processing circuit has a digital conversion unit that converts an analog signal output from the sensor into a digital signal, a shield line is used to transmit a weak analog signal output from the sensor. There is no need to use or increase the number of signal lines. As a result, a sensor unit can be built in a slim spout and an automatic faucet with high durability against static electricity can be realized.

On the other hand, according to yet another aspect of the present invention, there is provided a washbasin system comprising a washbasin and any one of the above-described automatic faucets installed on the washbasin.
According to the above configuration, the sensor unit does not malfunction or fail even when electrostatic noise is applied from the outside. As a result, it is possible to provide an automatic faucet type washing system capable of stable operation even when sensor units are integrated at a high density.

  ADVANTAGE OF THE INVENTION According to this invention, even in the automatic faucet which slimmed the spout and integrated the sensor unit with high density, it is possible to provide an automatic faucet capable of stable operation and a washing system provided with this automatic faucet. .

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Drawing 1 is a mimetic diagram showing important section composition of an automatic faucet concerning an embodiment of the invention.
FIG. 2 is a perspective assembly diagram showing a specific example of a wash system provided with this automatic faucet.

That is, the automatic water faucet of the present embodiment includes a spout 700, a solenoid valve 400, and a functional unit 300. In the spout 700, a connecting hose 500 is accommodated, and a water discharge port 720 is connected to the tip thereof. And the sensor unit 100 is provided side by side with the water outlet 720. In the case of the specific example illustrated in FIG. 1, the sensor unit 100 is arranged near the tip of the spout 700 in parallel with the water outlet 720, but the present invention is not limited to this, and a specific example will be described later. As described above, the sensor unit 100 may be built in the middle of the spout 700 and detected from the side surface of the spout.
The sensor unit 100 is connected to a functional unit 300 including a controller and a power supply circuit via a wiring 200. The functional unit 300 controls the opening / closing operation of the electromagnetic valve 400 according to the signal from the sensor unit 100.

In this embodiment, the spout 700 is grounded via the connection path 600 as shown in FIG. The connection path 600 may be a direct ground wiring as shown in FIG. 1, or, as will be described in detail later with reference to a specific example, through a part of piping, valve parts, etc., water, etc. It may be. As the direct ground wiring, for example, a ground terminal attached to a power outlet and the spout 700 are connected by wiring. By grounding the spout 700 in this way, it is possible to stably operate the automatic water faucet while suppressing malfunction or failure of the sensor unit 100 due to electrostatic noise.
In the present specification, grounding the spout 700 means providing a current path whose impedance viewed from the electrostatic noise applied to the spout 700 is lower than that of the sensor unit 100.

FIG. 3 is a block diagram illustrating a specific configuration of the functional unit 300.
The functional unit 300 includes, for example, a power supply unit 310, a constant voltage circuit 320, and a controller 330. The power supply unit 310 transforms and rectifies commercial AC 100 volts to generate DC power. The constant voltage circuit 320 controls the obtained DC power voltage within a predetermined range. The controller 330 includes, for example, a CPU (central processing unit), a drive circuit, and the like, supplies power to the sensor unit 100, inputs a sensing output from the sensor unit 100, and performs arithmetic processing. The sensing output signal from the sensor unit 100 is input to the controller 330 as serial data having a predetermined number of bits, for example. The controller 330 controls the opening / closing operation of the electromagnetic valve 400 including, for example, a latching solenoid valve, based on the sensing output from the sensor unit 100. The configuration of the functional unit 300 is not limited to that illustrated in FIG. 3. For example, the functional unit 300 uses a primary battery, a secondary battery, or the like as a power source, or the hydraulic power of water flowing through the electromagnetic valve 400. It is also possible to use the output of a generator that generates electricity using as a power source.

FIG. 4 is a block diagram illustrating a specific configuration of the sensor unit 100.
That is, the sensor unit 100 includes a control unit 110 incorporating a CPU and an A / D conversion circuit, a memory 120 such as an EEPROM, a synchronous integration circuit 130, a constant current driving circuit 140, a light emitting element 150, a light receiving element 160, and the like. For example, one pulse of light is emitted from the light emitting element 150 for one detection. A detection signal from the light receiving element 160 that receives the light reflected from the detection body is amplified, noise is removed by the synchronous integration circuit 130, A / D converted, and processed by the CPU as reflected light amount data, and the functional unit 300 as serial data. Is output.

  The sensor unit 100 having the circuit configuration illustrated in FIG. 4 is formed by mounting a plurality of semiconductor chips on a substrate. The sensor unit 100 is built in the spout 700.

FIG. 5 is a perspective exploded view of the tip of the spout.
That is, the tip of the spout 700 is opened in a substantially cylindrical shape. In this opening, the water outlet 720 connected to the connection hose 500 and the sensor unit 100 are accommodated together.

  FIG. 6 is a schematic view illustrating the positional relationship between the water outlet 720 and the sensor unit 100.

  That is, a substantially cylindrical water discharge port 720 is eccentrically arranged in the opening of the substantially cylindrical spout 700, and the substantially arc-shaped sensor unit 100 is provided side by side so as to surround the remaining half space. That is, the sensor unit 100 is disposed so as to be sandwiched between the water outlet 720 and the spout 700. The sensor unit 100 has a structure in which a metal shield 180 surrounds the circuit portion 170 and is housed in a case 190 made of an insulator such as plastic. That is, the circuit block illustrated in FIG. 4 is accommodated as the circuit unit 170.

  When the sensor unit 100 having such a structure is accommodated in the spout 700, a capacitance (capacitance) is generated between the spout 700 and the shield 180, so that the sensor unit 100 is easily affected by impulse noise such as static electricity (surge). . If the sensor unit 100 is downsized in response to the slimming down of the automatic faucet, the thickness of the case 190 is reduced and the capacity between the spout 700 and the shield 180 is further increased. It becomes easy.

FIG. 7 is a schematic diagram for explaining the use state of the automatic faucet.
In other words, the user 900 who uses the automatic water faucet is not normally in a completely grounded state but is in a state where a predetermined charge Q is charged. When the user 900 approaches or comes into contact with the spout 700, this electric-discharge (ESD) may occur. Since the discharge is generated in a pulse shape, it includes an AC component and flows through a capacitor formed by the spout 700 and the shield of the sensor unit 100. The charge Q released from the user 900 often flows to the ground via the water in the pipe of the automatic faucet as illustrated in FIG. At this time, an inflow or discharge of an electrostatic current may occur in the circuit unit 170 built in the sensor unit 100, causing malfunction or failure. As an example of the failure, there is a phenomenon in which a leakage current increases due to deterioration of the protective element provided in the circuit unit 170.

FIG. 8 is an equivalent circuit diagram when the automatic faucet circuit is not directly grounded.
When the automatic faucet circuit is not directly grounded, a capacitance C2 is formed between the ground potential and the ground of the circuit insulated by the solenoid valve 400 when water is grounded. A capacitor C1 is formed between the shield 180 of the sensor unit and the spout 700. On the other hand, when the user 900 having the capacity C is charged with the charge Q, the potential V is generated as viewed from the ground. The static electricity due to the potential V is discharged by flowing through the capacitors C1 and C2.

  As described above, when the user is charged and a discharge occurs in the spout 700, a large current may flow through the automatic faucet circuit through several paths, resulting in malfunction or failure.

  On the other hand, in the present invention, the spout 700 is grounded as shown in FIG. In this way, even if static noise flows into the spout 700 from the user 900, it is immediately released to the ground and does not flow into the built-in sensor unit 100 or the like. As a result, even when the spout 700 is slimmed down and the thickness of the case 190 of the sensor unit is reduced, problems such as malfunction and failure can be solved.

  Hereinafter, a specific example of grounding the spout 700 in the present embodiment will be described.

FIG. 9 is a perspective assembly view illustrating a specific structure of the spout.
That is, the fixed shaft 750 is attached to the spout 700. The fixed shaft 750 passes through an attachment hole provided in a washstand (not shown), and is fixed by a hexagon nut 756 via a packing 760, a washer 752, and a washer 754. A connecting hose 500 is inserted into the spout 700 and connected to the water discharge joint 722 by a hose clamp 502. A water discharge cap (water discharge port) 720 is attached to the tip of the water discharge joint 722. The water outlet 720 and the sensor unit 100 are fixed to the tip of the spout 700 by a fixing screw 726.

  The spout 700 is often made of metal and is electrically connected to the fixed shaft 750. Therefore, when the spout 700 is grounded, it is convenient to connect a connection path 600 such as an electric wire to the fixed shaft 750.

  Hereinafter, a specific example of grounding the spout 700 will be described.

FIG. 10 is a schematic diagram illustrating a specific example in which the spout 700 is grounded via the functional unit 300.
That is, when the functional unit 300 is connected to an outlet such as AC 100 volts, it can be grounded by connecting the ground terminal of the outlet and the spout 700. At this time, the connection path 600 can be wired via the functional unit 300 as illustrated in FIG.

FIG. 11 is a schematic diagram illustrating a specific example in which the spout 700 is grounded through the water outlet 720.
That is, when the water outlet 720 is made of a conductive material such as a metal, the spout 700 and the water outlet 720 can be grounded by being connected by the connection path 600. However, in this case, water is continuously present in the connecting hose 500 from the electromagnetic valve 400 to the water outlet 720, and electrical conduction is formed between the upstream water channel and the downstream water channel of the electromagnetic valve 400. It is desirable that

  As shown by a one-dot chain line in FIG. 11, when the water outlet 720 is grounded through water, a discharge path can be formed by connecting the spout 700 to the water outlet 720, and the automatic faucet malfunctions. And failure can be suppressed.

FIG. 12 is a schematic diagram illustrating a specific example in which the spout 700 is grounded via the connecting hose 500.
That is, when the connection hose 500 is formed of a conductive material, a ground path is formed through the connection hose 500 or water therein and the electromagnetic valve 400. Therefore, if the spout 700 and the connecting hose 500 are connected by the connection path 600, the spout 700 can be grounded. For example, this example can be implemented by using a conductive resin or the like as the material of the connection hose 500.

FIG. 13 is a schematic diagram showing a specific example in which the spout 700 is grounded via the electromagnetic valve 400.
In other words, when there is a grounded part in the solenoid valve 400, the spout 700 can be grounded by connecting the part and the spout 700 through the connection path 600. Also in this case, the spout 700 can be grounded by connecting the fixed shaft 750 and the solenoid valve 400 as described above with reference to FIG.

FIG. 14 is a schematic view illustrating the cross-sectional structure of the electromagnetic valve 400.
That is, the electromagnetic valve 400 has a structure in which a plunger 420, a solenoid coil 430, a seat portion 440, and the like are provided on a metal frame 410. Water is supplied from the primary side as represented by an arrow in the figure, and the flow path to the secondary side is opened and closed according to the movement of the sheet portion 440. The frame 410 is in contact with water, and electrical conduction is ensured between the primary side and the secondary side of the water channel by the metal frame 410.

  Therefore, when the electromagnetic valve 400 having such a structure is used, the spout 700 can be grounded reliably and easily by connecting the spout 700 and the frame 410 of the electromagnetic valve 400 through the connection path 600.

FIG. 15 is a schematic diagram illustrating a specific example in which the spout 700 is grounded to the primary side piping of the electromagnetic valve 400.
That is, in a normal use mode, the primary side piping of the solenoid valve 400 is often made of metal. In many cases, the primary side pipe is always filled with water. Therefore, if the spout 700 is connected to the primary side pipe via the connection path 600, the spout 700 can be grounded.

FIG. 16 is a schematic diagram illustrating a specific example in which the spout 700 is grounded to the water stop cock 480.
That is, normally, the stop cock 480 is often provided on the primary side of the solenoid valve 400. The stop cock 480 enables manual opening and closing of the water channel, and can be used, for example, to stop water supply at the time of construction for installing or replacing / removing an automatic faucet.

FIGS. 17A and 17B are schematic views illustrating a state in which the functional unit 300 is installed in the vicinity of the stop cock 480.
As described above, the automatic faucet functional unit 300 and the solenoid valve 400 are installed in the vicinity of the stop cock 480 attached to the wall surface of the washroom, and automatically control the opening and closing of the water channel on the secondary side of the stop cock 480. To do. And, in most cases, such a stop cock 480 has a structure in which a metal frame is in contact with water on the primary side and the secondary side, like the electromagnetic valve 400 described above with reference to FIG. Therefore, if the water stopcock 480 and the spout 700 are connected by the connection path 600, the spout 700 can be reliably and easily grounded.

  As described above, the embodiment in which the spout 700 is grounded against the discharge from the user 900 has been described. However, the present invention is not limited to these specific examples. In addition to these, for example, a needle-like electrode may be installed on the spout 700, and discharge may be generated in the air via this electrode. That is, the sensor unit 100 is protected by connecting a “static dischargerr” to the spout 700 so that static noise flowing into the spout 700 is discharged into the air from the tip of the needle-like electrode. It is also possible to do.

Next, as another embodiment of the present invention, an embodiment in which spout is made into resin will be described.
FIG. 18 is a schematic view illustrating the cross-sectional structure inside the spout 700R of this embodiment.
That is, in the present embodiment, the sensor unit 100 and the water discharge port 720 are accommodated in a resin spout 700R.

If the spout 700R is formed of an insulating resin, no electric discharge is generated from the user 900, and the sensor unit 100 accommodated therein is reliably protected. Further, the parasitic capacitance through the case 190 as described above with reference to FIG. 6 is not formed. Therefore, even if the spout 700R is slimmed, it is possible to prevent malfunction or failure of the sensor unit due to ESD from the user.
Further, when the spout 700R is formed of a resin, mechanical flexibility is obtained and deformation becomes easy. Therefore, the user can bend the spout 700R to discharge water at a desired angle or direction.

The embodiment of the present invention has been described above.
Next, an example of an experiment conducted by the inventor will be described.
First, the results of an experiment examining the effect of grounding the spout 700 will be described.

FIG. 19 is a schematic diagram for explaining an experiment conducted by the present inventor.
That is, as shown in FIGS. 19A and 19B, a metal spout 700, a functional unit 300, and an electromagnetic valve 400 were installed on a corrugated cardboard 1000 having a thickness of 26 centimeters. A sensor unit 100 (not shown) is accommodated at the tip of the spout 700. The sensor unit 100 accommodated in the spout 700 and the functional unit 300 are connected, and the functional unit 300 and the electromagnetic valve 400 are connected.
In the case of the condition (condition 1) shown in FIG. 19A, the solenoid valve 400 is grounded to the ground plane (GP) and is in a condition close to the actual use state.
On the other hand, in the case of the condition (condition 2) shown in FIG. 19B, the solenoid valve 400 is connected to the ground plane, and the spout 700 is also connected to the ground plane to be grounded.

  And about these conditions 1 and 2, the electrostatic test by making a spout contact discharge (no spark) was implemented. In either case, the discharge capacitor was 150 picofarads, the discharge resistance was 330 ohms, and discharge was performed with the discharge gun 1500 in contact with the spout 700. In addition, the discharge voltage was increased by 1 to 2 kilovolts, and the discharge was performed 10 times at each voltage level, and the operation of the sensor unit 100 was examined.

FIG. 20 is a list summarizing the results of this test.
When the spout 700 was not grounded (condition 1), the consumption current of the sensor unit 100 increased to 13 milliamperes when the discharge voltage was increased to 16 kilovolts. This is considered to be because a large current flows through the protective element of the sensor unit and deteriorates to cause a leak. The current consumption during normal operation is about 100 microamperes.

  On the other hand, when the spout 700 was grounded (condition 2), no abnormality occurred in the sensor unit 100 even when the discharge voltage was increased to 30 kilovolts. That is, it was confirmed that the durability against static electricity was greatly improved by grounding the spout 700.

Next, an experiment in which spout is made into resin will be described.
FIG. 21 is a schematic diagram showing the conditions of an experiment for examining the effect of converting spout into a resin.

  That is, the resin spout 700R, the functional unit 300, and the electromagnetic valve 400 were installed on the corrugated cardboard 1000 having a thickness of 26 centimeters as described above with reference to FIG. A sensor unit 100 (not shown) is accommodated at the tip of the spout 700R. The sensor unit 100 accommodated in the spout 700R and the function unit 300 are connected, and the function unit 300 and the electromagnetic valve 400 are connected. The electromagnetic valve 400 was grounded.

  Under these conditions, a test by contact discharge similar to that described above with reference to FIG. 19 was performed. As a result, no abnormality was found in the sensor unit 100 even when the discharge voltage was increased to 30 kilovolts. In other words, it was confirmed that the durability against static electricity is greatly improved when the spout 700R is formed of resin.

  As described above, according to the present invention, the spout 700 is grounded or the spout 700R is made of resin, so that the influence of electrostatic noise can be cut off and the operation can be stably performed. As a result, it is possible to stably operate the automatic water faucet with improved design and versatility by slimming the spout 700 (700R).

  FIG. 22 is a partial schematic cross-sectional view showing a wash basin provided with an automatic faucet according to the present invention.

That is, a spout 700 is installed in the washstand 800, and water supplied through the connection hose 500 can be discharged to the bowl surface. The sensor unit 100 is provided on the side surface of the spout 700. When the user puts out a hand, the sensor unit 100 detects it and starts water discharge.
According to the present invention, the spout 700 is grounded or made into a resin, so that malfunctions and failures due to static electricity due to discharge from the user to the spout can be reliably prevented.

FIG. 23 is a schematic view showing a second specific example of the automatic faucet according to the present invention. That is, in the case of this specific example, the spout 720 and the sensor unit 100 are provided at the opening end of the tip of the spout 700. If it does in this way, it will become difficult for the user to see the sensor unit 100, and the external appearance will become clearer. Moreover, if a user puts out a hand in front of the spout 720, it can be made to detect reliably and it is excellent in a usability | use_condition.
Also in this specific example, by grounding or resinating the spout 700, it is possible to reliably prevent malfunction or failure due to static electricity due to discharge from the user to the spout.

  Furthermore, faucets continue to evolve both in function and design, and are being streamlined.

FIG. 24 is a schematic diagram showing the appearance of an automatic faucet developed by the present inventor.
That is, in the case of this automatic faucet, the outer diameter of the spout 700 is as thin as 20 millimeters, which is about half the slim size shown in FIG. And at the front-end | tip, the water outlet 720 and the sensor unit 100 are provided side by side with high density. This automatic faucet is excellent in terms of design, is highly versatile, and can reliably detect the position of the user's hand and control water discharge.

  Even when the spout is slimmed down in this way, it is possible to reliably prevent malfunction or failure due to static electricity due to discharge from the user to the spout by grounding the spout 700 or using a resin. it can.

The embodiments of the present invention have been described above with reference to specific examples. However, the present invention is not limited to these specific examples.
For example, the shape and structure of the spout, sensor unit, water outlet, functional part, electromagnetic valve, etc., the size, the arrangement relationship, etc., as long as the person skilled in the art adopts the design change as appropriate, also have the gist of the present invention It is included in the scope of the present invention.

It is a schematic diagram showing the principal part structure of the automatic water faucet concerning embodiment of this invention. It is a perspective assembly drawing showing the specific example of the washing system which installed the automatic faucet of this embodiment. 3 is a block diagram illustrating a specific configuration of a function unit 300. FIG. 2 is a block diagram illustrating a specific configuration of a sensor unit 100. FIG. It is a perspective exploded view of the tip part of a spout. 4 is a schematic view illustrating the positional relationship between the water outlet 720 and the sensor unit 100. FIG. It is a schematic diagram for demonstrating the use condition of an automatic water tap. It is an equivalent circuit diagram when the circuit of the automatic faucet is not directly grounded. It is a perspective assembly drawing which illustrates the specific structure of a spout. FIG. 6 is a schematic diagram illustrating a specific example in which the spout 700 is grounded via a ground wiring incorporated in the functional unit 300. It is a schematic diagram showing the specific example which earth | grounds the spout 700 through the water outlet 720. FIG. It is a schematic diagram showing the specific example which earth | grounds the spout 700 through the connection hose 500. FIG. 6 is a schematic diagram showing a specific example in which the spout 700 is grounded via the electromagnetic valve 400. FIG. 3 is a schematic view illustrating a cross-sectional structure of a solenoid valve 400. FIG. 5 is a schematic diagram showing a specific example in which the spout 700 is grounded to the primary side pipe of the solenoid valve 400. FIG. It is a schematic diagram showing the specific example which earth | grounds the spout 700 to the water stop cock 480. FIG. 6 is a schematic view illustrating a state in which a functional unit 300 is installed in the vicinity of a water stop cock 480. FIG. It is a schematic diagram which illustrates the cross-section inside spout 700 of embodiment of this invention. It is a schematic diagram for demonstrating the experiment which this inventor implemented. It is the list which put together the result of the test which this invention implemented. It is a schematic diagram showing the conditions of the experiment which investigated about the effect of making spout 700 into resin. It is a partial cross section schematic diagram showing the washstand provided with the automatic faucet concerning the present invention. It is a schematic diagram showing the 2nd example of the automatic water tap of this invention. It is a schematic diagram showing the external appearance of the automatic water tap which this inventor developed. It is a partial cross section schematic diagram showing the washstand which provided the automatic faucet used conventionally.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Sensor unit 110 Control part 120 Memory 130 Synchronous integration circuit 140 Constant current drive circuit 150 Light emitting element 160 Light receiving element 170 Sensor unit circuit part 180 Shield 190 Case 200 Wiring 300 Function part 310 Power supply part 320 Constant voltage circuit 330 Controller 400 Solenoid valve 410 Frame 420 Plunger 430 Solenoid coil 440 Seat part 480 Water stopcock 500 Connection hose 500 Wiring 502 Hose clamp 600 Connection path 700, 700R Spout 720 Water outlet 722 Water discharge joint 726 Fixing screw 750 Fixing shaft 752 Washer 754 Washer 756 Hexagon nut 760 Packing 800 Wash basin 900 User

Claims (7)

Spout and
A spout provided in the spout;
A sensor unit built in the spout and including a sensor and a signal processing circuit;
A solenoid valve for controlling the opening and closing of the water passage leading to the water outlet;
A control unit for controlling the operation of the solenoid valve based on an output signal from the sensor unit;
A connection path for connecting the spout to ground;
An automatic faucet characterized by comprising   The automatic faucet according to claim 1, wherein the connection path is connected to the electromagnetic valve. A connecting hose made of a conductive material and connecting the water outlet and the solenoid valve is further provided,
The automatic faucet according to claim 1, wherein the connection path connects the spout and the connecting hose.   The automatic faucet according to claim 1, wherein the connection path is connected to a stop cock connected to a primary side of the electromagnetic valve. A spout made of an insulating material;
A spout provided in the spout;
A sensor unit built in the spout and including a sensor and a signal processing circuit;
A solenoid valve for controlling the opening and closing of the water passage leading to the water outlet;
A control unit for controlling the operation of the electromagnetic valve based on an output from the sensor unit;
An automatic faucet characterized by comprising   The automatic water faucet according to any one of claims 1 to 5, wherein the signal processing circuit includes a digital conversion unit that converts an analog signal output from the sensor into a digital signal. A washbasin,
The automatic faucet according to any one of claims 1 to 6, which is installed on the washstand,
A washbasin system characterized by comprising: