JP2020165203A - Water discharge device - Google Patents

Abstract

To provide a water discharge device capable of suppressing the influences of electromagnetic noise due to electromagnetic waves while reducing the size of a photoelectric sensor.SOLUTION: A water discharge device 1 according to this invention includes a water discharge part 18, a water discharge flow path 22, and a photoelectric sensor 24 for receiving light reflected from projected detection light to output an input signal corresponding to the received light from the reflected light, the photoelectric sensor including a light projecting element 36 for projecting the detection light, a light receiving element 38 for receiving the reflected light, a sensor substrate 40 formed with an electronic circuit, the sensor substrate including a first substrate surface 40a on one side where the light receiving element is arranged, and a second substrate surface 40b on the other side, and a metal shield case 39 provided on the first substrate surface side so as to cover an area at least on the upper side and the lateral side of the light receiving element on the first substrate surface of the sensor substrate for shielding electromagnetic waves, the sensor substrate further including a GND pattern 70 provided on the second substrate surface side for shielding the electromagnetic waves.SELECTED DRAWING: Figure 6

Description

The present invention relates to a water discharge device, and more particularly to a water discharge device that discharges supplied water.

Conventionally, as shown in Patent Document 1, a water discharge device provided with a photoelectric sensor is known. The photoelectric sensor detects an object by receiving the reflected light of the detection light projected by the light projecting element by the light receiving element. Since the light receiving element of such a photoelectric sensor transmits an analog signal as a light receiving signal, it is easily affected by electromagnetic noise due to electromagnetic waves. Therefore, electromagnetic waves are shielded by providing a metal shield case that surrounds the light receiving element and the entire inner case.

JP-A-2017-203348

However, since the photoelectric sensor as shown in Patent Document 1 shields electromagnetic waves, when a metal shield case that surrounds the light receiving element and the entire inner case is provided, the shield case becomes relatively large and the photoelectric sensor There is a problem that it is difficult to miniaturize.

Therefore, the present invention has been made to solve the above-mentioned problems of the prior art, and electromagnetic waves are formed by forming a GND pattern without forming a shield case that covers the second substrate surface side of the sensor substrate. It is an object of the present invention to provide a water discharge device capable of shielding the light, reducing the size of the photoelectric sensor, and suppressing the influence of electromagnetic noise caused by electromagnetic waves.

In order to solve the above-mentioned problems, the present invention is a water discharge device that discharges supplied water, and guides the water discharge unit that discharges water from the spout and the water supplied from the water supply source to the spout. The photoelectric flow path is provided with a water discharge flow path and a photoelectric sensor which is arranged in the water discharge portion and outputs a reception signal corresponding to the reception of the reflected light by receiving the reflected light of the projected detection light. The sensor is a sensor substrate on which an electronic circuit is formed of a light projecting element that projects the detected light, a light receiving element that receives the reflected light, and the sensor board is one side on which the light receiving element is arranged. The sensor substrate having the first substrate surface and the second substrate surface on the other side, and the first substrate so as to cover at least above and side of the light receiving element on the first substrate surface of the sensor substrate. It is provided with a metal shield case provided on the surface side and shields electromagnetic waves, and the sensor substrate is further provided with a GND pattern provided on the surface side of the second substrate and shields electromagnetic waves.
In the present invention configured as described above, the photoelectric sensor is provided on the first substrate surface side so as to cover at least the upper side and the side of the light receiving element on the first substrate surface of the sensor substrate, and is a metal that shields electromagnetic waves. The sensor substrate is further provided on the surface side of the second substrate and has a GND pattern that shields electromagnetic waves. As a result, the electromagnetic wave from the first substrate surface side can be shielded by the shield case against the light receiving element arranged on the first substrate surface on one side of the sensor substrate, and the electromagnetic wave from the second substrate surface side can be shielded by the GND pattern. .. Therefore, the electromagnetic wave can be shielded by forming the GND pattern on the second substrate surface side without forming the shield case on the second substrate surface side of the sensor substrate, and the shield case can be miniaturized. Therefore, the photoelectric sensor can be miniaturized and the influence of electromagnetic noise due to electromagnetic waves can be suppressed.

In the present invention, preferably, the second substrate surface of the sensor substrate is arranged toward the water discharge flow path.
In the present invention configured in this way, since the second substrate surface of the sensor substrate is arranged toward the water discharge flow path, the GND pattern provided on the second substrate surface side is tentatively extended to the outer peripheral end of the sensor substrate. Even if it is not provided, the electromagnetic waves can be shielded by the water in the water discharge flow path, and the influence of the electromagnetic noise due to the electromagnetic waves from the second substrate surface side can be suppressed.

In the present invention, preferably, the sensor substrate is arranged in a region where the analog signal circuit connected to the light receiving element and the digital signal circuit connected to the light projecting element are distinguished, and the shield case is It is formed so as to cover at least above and to the side of the analog signal circuit without covering the digital signal circuit.
In the present invention configured as described above, since the shield case is formed so as to cover at least the upper side and the side surface of the analog signal circuit without covering the digital signal circuit, the entire analog signal circuit and the digital signal circuit are formed. The size of the shield case can be suppressed as compared with the case where it is formed so as to cover the shield case. Therefore, by covering the analog signal circuit with a shield case, the influence of electromagnetic noise due to electromagnetic waves can be suppressed, the shield case can be miniaturized, and the photoelectric sensor can be further miniaturized.

In the present invention, preferably, the sensor substrate is a separate substrate that distinguishes the substrate including the analog signal circuit connected to the light receiving element from the substrate including the digital signal circuit connected to the light projecting element. Form as.
In the present invention configured as described above, the sensor substrate is a separate substrate that distinguishes the substrate including the analog signal circuit connected to the light receiving element from the substrate including the digital signal circuit connected to the light projecting element. Form. As a result, the shield case is formed on a part of the substrate including both the analog signal circuit and the digital signal circuit, and it is possible to prevent the shield case from having a complicated shape. Therefore, the shield case can be relatively easily attached only to the substrate side including the analog signal circuit.

In the present invention, preferably, the photoelectric sensor further includes a harness that is electrically connected to a control unit that controls the water discharge device, and the harness is connected to a digital signal circuit of an electronic circuit of the sensor board. Will be done.
In the present invention configured in this way, since the harness is connected to the digital signal circuit of the electronic circuit of the sensor board, the connection portion between the harness and the electronic circuit is formed so as to be relatively insensitive to electromagnetic noise. To. As a result, the influence of electromagnetic noise due to electromagnetic waves can be further suppressed without arranging the connection portion between the harness and the electronic circuit in the shield case. Further, it is possible to prevent the shield case from being enlarged so as to cover the connection portion between the harness and the electronic circuit, and the shield case can be miniaturized.

In the present invention, preferably, the shield case includes a wall surface arranged between the light projecting element and the light receiving element.
In the present invention configured in this way, since the shield case includes a wall surface arranged between the light emitting element and the light receiving element, the detection light projected from the light emitting element by the shield case is a photoelectric sensor. It is possible to suppress the occurrence of erroneous detection of the light receiving element by reaching the light receiving element due to internal reflection or the like and being detected by the light receiving element.

According to the water discharge device of the present invention, the photoelectric sensor can be miniaturized and the influence of electromagnetic noise due to electromagnetic waves can be suppressed.

It is a schematic block diagram which shows typically the water discharge system provided with the water discharge device by one Embodiment of this invention. It is an exploded perspective view of the photoelectric sensor of the water discharge device of FIG. It is a top view seen from the upper surface in the state which excluded the ceiling part of the sensor case of the photoelectric sensor of the water discharge device of FIG. 1, the ceiling part of a light-shielding case, and the ceiling part of a shield case. It is sectional drawing seen along the IV-IV line of FIG. It is sectional drawing which shows the cross section seen along the VV line of FIG. 1 in the state which removed the light-shielding case. FIG. 5 is a partially enlarged cross-sectional view showing an enlarged photoelectric sensor of FIG. 5 with the sensor case and the light-shielding case removed. It is a figure which shows the state which the circuit board of the photoelectric sensor of FIG. 2 was seen from below.

Hereinafter, a water discharge system including a water discharge device according to an embodiment of the present invention will be described with reference to the accompanying drawings.
First, FIG. 1 is a schematic configuration diagram schematically showing a water discharge system including a water discharge device according to an embodiment of the present invention. The water discharge device 1 is an automatic faucet type water discharge device that detects a user's fingers and / or an object and automatically discharges water.
As shown in FIG. 1, the water discharge system 2 provided with the water discharge device 1 according to the embodiment of the present invention is a water discharge system for a washbasin. The water discharge system 2 includes a water discharge device 1 that discharges the supplied water, a bowl portion 4 that receives the water discharged from the water discharge device 1, and a drainage channel 6 that drains the water received by the bowl portion 4. There is.
The water discharge device 1 of the water discharge system 2 can be provided in a portion such as a water discharge device of a water discharge system for a kitchen, a water discharge device of a water discharge system for a urine, a water discharge device of a water discharge system for a hand washing machine, or the like. ..

The water discharge device 1 is a water discharge device that discharges water supplied from a water supply source (not shown), and is installed at a counter 8 or the like.
The water discharge device 1 includes a faucet main body 10 fixed to a counter 8, a water supply channel 12 extending from a water supply source, an electromagnetic valve 14 for opening and closing the water supply channel 12, and a control unit 16 for controlling the electromagnetic valve 14. There is.

The solenoid valve 14 is electrically connected to a control unit 16 described later, and is controlled by the control unit 16 described later.

The faucet main body 10 includes a water discharge portion 18 extending upward on the bowl portion 4 side, a water discharge flow path 22 that guides water supplied from the water supply source to the water discharge port 20, and a photoelectric sensor 24 arranged in the water discharge portion 18. It has.
The water discharge flow path 22, the photoelectric sensor 24, and the like are arranged in the inner space of the hollow square columnar outer member 10a of the faucet main body 10. The outer member 10a is made of metal. The outer member 10a is not limited to the metal one, and may be partially made of resin, and the resin surface is subjected to a metal-like surface finish by metal plating, metal vapor deposition, or the like. May be good. The outer member 10a may have a tubular shape.

The water discharge unit 18 is formed so as to discharge water from the water discharge port 20. The outer shape of the water discharge portion 18 is formed by the outer member 10a of the faucet main body 10. The water spouting portion 18 is formed so as to arrange a spouting port 20 for spouting water inside the opening of the outer member 10a. The spout 20 is formed at the downstream end of the spout 22. The water discharge flow path 22 forms a flow path through which water passes, and is filled with water when the water discharge device 1 is used. The water in the present embodiment is not limited to so-called tap water and well water, but is hot water whose temperature is controlled by a temperature control device (not shown), so-called modified functional water (acidic, alkaline, sterilizing effect). (Functional water such as water), water soap, etc. are also included.

The control unit 16 is a control unit that controls the water discharge device 1. The control unit 16 is electrically connected to each functional unit such as the solenoid valve 14 and the photoelectric sensor 24, can transmit and receive electric signals to each other, and can electrically operate each functional unit. For example, the control unit 16 has a function of controlling the opening / closing operation of the solenoid valve 14, the detection operation of the photoelectric sensor 24, and the like. The control unit 16 receives the received signal (detection signal) of the photoelectric sensor 24 and controls the solenoid valve 14 according to a program or the like stored in advance. The control unit 16 includes a storage device (not shown) such as a memory and an arithmetic unit (not shown) that can control each device. The control unit 16 has a function of controlling the water discharge from the water discharge unit 18 based on the detection of the user by, for example, the photoelectric sensor 24, by controlling each device.

The photoelectric sensor 24 is arranged in the water discharge unit 18, and receives the reflected light B of the projected detection light A, so that the reception signal (detection signal) corresponding to the light reception of the reflected light B is sent to the control unit 16. Output. The photoelectric sensor 24 is, for example, an infrared sensor. The photoelectric sensor 24 is housed inside the outer shell member 10a in the water discharge portion 18, and is arranged downward inside the outer shell member 10a. Further, the photoelectric sensor 24 is arranged inside the outer member 10a along with the water discharge port 20 in a state where the water discharge port 20 of the water discharge unit 18 is viewed from the front of the water discharge port 20.

In FIG. 1, the direction in which the photoelectric sensor 24 emits the detection light is the front side, the side opposite to the front side is the rear side, and the front-back direction of the photoelectric sensor 24 is indicated by an arrow X. The water discharge direction of the water discharge port 20 of the water discharge unit 18 is the front side of the water discharge port 20, and the water discharge flow path 22 side of the water discharge port 20 is the rear side of the water discharge port 20. The front direction of the water spout 20 and the front direction of the photoelectric sensor 24 are substantially the same, and the rear direction of the water spout 20 and the rear direction of the photoelectric sensor 24 are substantially the same.
The water discharge flow path 22 side of the photoelectric sensor 24 is the lower side, the side opposite to the lower side is the upper side, and the vertical direction of the photoelectric sensor 24 is indicated by an arrow Y. The right-hand direction of the photoelectric sensor 24 as viewed from the front side is the right side, the side opposite to the right side is the left side, and the left-right direction of the photoelectric sensor 24 is indicated by an arrow Z (see FIG. 3).

The photoelectric sensor 24 is arranged toward the water discharge direction (toward the bowl portion 4). By downsizing the photoelectric sensor 24, at least one of the elements such as the height, width, length, and outer diameter of the water discharge portion 18 can be made smaller depending on the orientation of the arrangement of the photoelectric sensor 24. it can. Therefore, the water discharge unit 18 and the water discharge device 1 can be miniaturized.

Next, as shown in FIGS. 2 to 4, the photoelectric sensor 24 will be described.
FIG. 2 is an exploded perspective view of the photoelectric sensor of the water discharge device of FIG. 1, and FIG. 3 shows the ceiling portion of the sensor case of the photoelectric sensor of the water discharge device of FIG. 1, the ceiling portion of the light-shielding case, and the ceiling portion of the shield case. It is a top view seen from the top surface in the state, and FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG.

The photoelectric sensor 24 includes a sensor case 26 formed in a hollow box shape, a back plate 28 formed so as to cover a rear opening 26a (see FIG. 3) that communicates the inside and the outside of the sensor case 26, and a back plate 28. A circuit board 32 on which an electronic circuit is formed, a harness 34 electrically connected to the circuit board 32, a light projecting element 36 that emits detection light A, a light receiving element 38 that receives reflected light B, and an electromagnetic wave. A shield case 39 for shielding electromagnetic noise generation factors such as external noise and signals, and a light shielding case 48 formed on the outside of the light projecting element 36 are provided.

As shown in FIG. 2, the sensor case 26 accommodates the circuit board 32 inside. The sensor case 26 is formed so as to cover the circuit board 32, the light emitting element 36, the light receiving element 38, and the like, and forms a waterproof case. The sensor case 26 has a rear opening 26a for attaching the back plate 28 and the harness 34, a detection light window 26b which is a member that transmits the detection light A, and a reflected light B reflected by the detection light A by the user's fingers or the like. It is provided with a reflected light window 26c which is a transmitting member.

The back plate 28 fixes the circuit board 32 inside the sensor case 26 in a state where the back plate 28 is fitted inside the sensor case 26.

As shown in FIG. 4, the back plate 28 forms a harness hole 28a (see FIG. 4) through which the harness 34 passes in the vertical wall-shaped portion 28b. The harness hole 28a forms an opening having a height slightly larger than the diameter of the harness 34 so that the harness 34 can pass through.
A resin layer (not shown) is formed so as to cover the outside of the back plate 28 attached to the rear opening 26a of the sensor case 26. This resin layer is formed by curing the resin by potting, and has a waterproof property of suppressing water from entering the circuit board 32 side inside the photoelectric sensor 24 from the outside.

The harness 34 is a wire harness that electrically connects the circuit board 32 and the control unit 16. The harness 34 is electrically connected to the harness board 42 by soldering the electric wire 34a in the cover to the harness board 42. The harness 34 is connected to the digital signal circuit of the electronic circuit of the main board 40.

The light projecting element 36 is arranged on the main body substrate 40. The light projecting element 36 is a surface mount type (for example, chip type) light projecting element. The light projecting element 36 is, for example, an LED. Further, the light emitting portion 36e of the light projecting element 36 is arranged on the main body substrate 40. The light emitting unit 36e of the light projecting element 36 is configured to emit infrared rays.

Next, the circuit board 32 of the photoelectric sensor 24 will be described in more detail with reference to FIGS. 2 to 6. FIG. 5 is a cross-sectional view showing a cross section seen along the VV line of FIG. 1 with the light-shielding case removed, and FIG. 6 is an enlarged view of the photoelectric sensor of FIG. 5 with the sensor case and the light-shielding case removed. It is a partially enlarged sectional view shown.

The circuit board 32 can connect the main body board 40, which is a sensor board on which the light emitting element 36 and the light receiving element 38 are arranged, the harness board 42 to which the harness 34 is soldered, and the main body board 40 and the harness board 42. It includes a flexible first flexible substrate 44.

As shown in FIG. 5, the main body substrate 40 is formed in a thin plate shape. The main body substrate 40 includes a first substrate surface 40a on one side on which the light receiving element 38 is arranged, and a second substrate surface 40b on the other side. The second substrate surface 40b is the back surface opposite to the first substrate surface 40a. The second substrate surface 40b is arranged toward the water discharge flow path 22 side. The main body substrate 40 extends in the front-rear direction and the left-right direction of the photoelectric sensor 24. The main body substrate 40 is formed of a rigid type printed circuit board.

As shown in FIGS. 2 and 3, the main body substrate 40 is further arranged on the side of the first sensor substrate 58 on which the light receiving element 38 is placed and the first sensor substrate 58, and is a light projecting element. It is arranged between the second sensor board 60 on which the 36 is arranged, the first sensor board 58 and the second sensor board 60, and electrically connects the first sensor board 58 and the second sensor board 60. A second flexible substrate 62, which is a connection substrate, is provided.

As shown in FIG. 3, the first sensor substrate 58 is formed of a rigid type printed circuit board. The light receiving signal circuit 64 for the analog signal before converting the analog signal of the reflected light B received by the light receiving element 38 (relatively weak to electromagnetic noise) into a digital signal form relatively strong against electromagnetic noise is the first sensor substrate. It is arranged in 58. The light receiving signal circuit 64 transmits an analog signal that is relatively weak against electromagnetic noise. That is, the first sensor board 58 includes a signal processing unit 66 on the first sensor board 58 that converts the analog signal of the reflected light B received by the light receiving element 38 into a digital signal form that is relatively strong against electromagnetic noise. There is. The first sensor board 58 also includes a digital signal circuit 69 that transmits a digital signal processed by the signal processing unit 66 on the first sensor board 58. In FIG. 3, the shape of the light receiving signal circuit 64 is shown by example, and the light receiving signal circuit 64 schematically shows a portion (region) in which the light receiving signal circuit is formed.

The light receiving signal circuit 64 is arranged in a rigid type and relatively simple rectangular first sensor substrate 58. As a result, the light receiving signal circuit 64 can be suppressed from being affected by electromagnetic noise by the relatively simple box-shaped shield case 39, and the photoelectric sensor 24 can be suppressed from being affected by electromagnetic noise. it can. The light receiving signal circuit 64 is formed so as to electrically connect the light receiving element 38 and the signal processing unit 66, and the digital signal circuit 69 electrically connects the signal processing unit 66 and the harness 34. As will be described later, the digital signal circuit 69 is formed through the second flexible substrate 62 and the second sensor substrate 60. In FIG. 3, the shapes of the digital signal circuits 68 and 69 are shown by example, and the digital signal circuits 68 and 69 schematically show a portion (region) in which the digital signal circuit is formed. The digital signal circuit 68 and the digital signal circuit 69 are collectively referred to as a digital signal circuit.
In this way, the circuit board 32 is arranged in a region in which the light receiving signal circuit 64, which is an analog signal circuit connected to the light receiving element 38, and the digital signal circuit 68 connected to the light emitting element 36 are distinguished. .. The circuit board 32 distinguishes the first sensor board 58 including the light receiving signal circuit 64 connected to the light receiving element 38 from the second sensor board 60 including the digital signal circuit 68 connected to the light projecting element 36. It is formed as a separate substrate.

The first sensor substrate 58 further includes a GND pattern (ground pattern) 70 provided on the second substrate surface 40b side and shields electromagnetic waves. Since the second substrate surface 40b of the first sensor substrate 58 is arranged toward the water discharge channel 22 side, the GND pattern 70 is arranged toward the water discharge channel 22 side. The GND pattern 70 is formed in a flat plate shape so as to cover substantially the entire second substrate surface 40b. The GND pattern 70 includes a GND pattern, a GND solid layer, and a GND pattern for shielding. The GND pattern 70 may have a function of shielding electromagnetic waves to a certain extent. The provision of the GND pattern 70 on the second substrate surface 40b side includes the case where the GND pattern 70 is arranged closer to the second substrate surface 40b side than the first substrate surface 40a of the first sensor substrate 58. That is, the GND pattern 70 is not limited to the layer on the second substrate surface 40b, and may be provided as an intermediate layer in the first sensor substrate 58. The GND pattern 70 and the shield case 39 are formed so as to have the same electric potential.

As shown in FIG. 3, the second sensor substrate 60 is formed of a rigid type printed circuit board. The second sensor board 60 is arranged parallel to or flush with the first sensor board 58. The second sensor board 60 includes a digital signal circuit 68 for a digital signal that transmits a digital signal on the second sensor board 60. Therefore, since the second sensor board 60 transmits a digital signal, the second sensor board 60 is not easily affected by electromagnetic noise even when it is not covered with the shield case 39. The digital signal circuit 68 is formed so as to electrically connect the harness 34 and the light projecting element 36. The harness 34 is connected to a digital signal circuit (digital signal circuit 68 and digital signal circuit 69).

The second flexible substrate 62 is formed in a thin plate shape and has flexibility. The second flexible substrate 62 is formed of a flexible type printed circuit board. The second flexible substrate 62 is formed at a position that extends the layer of the intermediate portion between the first sensor substrate 58 and the second sensor substrate 60. For example, the inner layer of the second flexible substrate 62 is exposed by removing the surface layer of a rigid type substrate such as the first sensor substrate 58 (or the second sensor substrate 60), and is formed by the inner layer. Therefore, for example, the second flexible substrate 62 may be formed by removing the surface layer of the rigid type substrate in which the first sensor substrate 58 and the second sensor substrate 60 are connected. Therefore, the thickness of the second flexible substrate 62 in the height direction (vertical direction) is smaller than the thickness of the first sensor substrate 58 (or the second sensor substrate 60) in the height direction (vertical direction). Further, the height of the upper surface (height in the vertical direction) of the second flexible substrate 62 is lower than the height (height in the vertical direction) of the upper surface of the first sensor substrate 58 (or the second sensor substrate 60).

The second flexible substrate 62 is arranged behind the rear end position 36b of the light projecting element 36 on the second sensor substrate 60. The second flexible board 62 includes a digital signal circuit 68 for a digital signal that transmits a digital signal on the second flexible board 62. Therefore, since the second flexible substrate 62 transmits a digital signal, the second flexible substrate 62 is not easily affected by electromagnetic noise even when it is not covered with the shield case.

The harness board 42 is fixed in a state of being arranged in a standing wall shape perpendicular to the main body board 40. The height of the harness board 42 in the vertical direction is smaller than the width in the horizontal direction thereof. The height of the harness substrate 42, that is, the height (length) of the photoelectric sensor 24 in the vertical direction is formed to be a height (length) corresponding to a size slightly larger than the diameter of the harness 34. The harness board 42 is formed of a rigid type printed circuit board.

A small hole 42a (see FIG. 4) is formed in the harness board 42, and a signal line of the harness 34 is inserted into the small hole 42a, and in the inserted state, the electric wire of the harness 34 and the small hole 42a of the harness board 42 are inserted. Soldered. By soldering the electric wire of the harness 34 and the small hole 42a, the two are electrically connected.

The first flexible substrate 44 is formed in a thin plate shape. The first flexible substrate 44 is arranged in a state of being bent by about 90 degrees between the main body substrate 40 extending in the front-rear direction (X direction) and the harness substrate 42 extending in the vertical direction (Y direction). The first flexible substrate 44 electrically connects the main body substrate 40 and the harness substrate 42. The first flexible substrate 44 is formed of a flexible type printed circuit board. The circuit board 32 may be formed of a rigid flexible substrate in which the arrangement portion of the first flexible substrate 44 is formed so as to bend.

The light-shielding case 48 is formed in a box shape that covers the main body substrate 40 in the vertical and horizontal directions. Further, the light-shielding case 48 includes a first light-shielding wall 50 arranged between the light-emitting element 36 and the light-receiving element 38. The front end of the first light-shielding wall 50 extends to the vicinity of the inside of the front surface portion of the sensor case 26, and the rear end extends to the vicinity of the harness substrate 42. The entire vertical direction of the first light-shielding wall 50 extends from the front end position 36a of the light projecting element 36 to a position behind the rear end position 36b and in front of the second flexible substrate 62 in the front-rear direction. The portion of the first light-shielding wall 50 above the second flexible substrate 62 is located rearward from the front end position 36a of the light projecting element 36 and above the second flexible substrate 62. It is formed up to the rear of the second flexible substrate 62. The first light-shielding wall 50 is formed with a slit 50a that allows the second flexible substrate 62 to be arranged inside. Therefore, when the light-shielding case 48 is inserted from the front so as to cover the main body substrate 40, the second flexible substrate 62 is passed through the slit 50a. The light-shielding case 48 is made of a resin capable of blocking the detected light. Since the light-shielding case 48 is made of a light-shielding material, it does not have a function of effectively shielding electromagnetic waves. With such a configuration, the light-shielding case 48 suppresses that the detection light projected from the light-emitting element 36 reaches the light-receiving element 38 by reflection or the like and is detected by the light-receiving element 38, causing erroneous detection. Can be done.

The shield case 39 is formed in a rectangular parallelepiped box shape. The shield case 39 can accommodate the first sensor substrate 58 with the light receiving element 38 inside. The shield case 39 is attached to the inside of the light-shielding case 48. The shield case 39 has a size slightly smaller than that of the light-shielding case 48. The shield case 39 forms a metal shield case that shields electromagnetic waves. A part of the shield case 39 may be formed of another member having a shielding function of electromagnetic waves.

The shield case 39 is formed so as to cover at least a part of the light receiving element 38 on the first substrate surface 40a of the main body substrate 40. More specifically, the shield case 39 is provided on the first substrate surface 40a side of the main body substrate 40 so as to cover at least both the upper side and the side surface of the light receiving element 38 on the first substrate surface 40a. The upper part of the light receiving element 38 is the upper side in the vertical direction of the light receiving element 38 (the vertical direction of the first sensor substrate 58), and the side of the light receiving element 38 is the horizontal direction of the light receiving element 38 (the first sensor substrate 58). Left and right direction) right side direction and left side direction. The shield case 39 is formed so as not to cover the digital signal circuit 68 but to cover at least both the upper side and the side of the light receiving signal circuit 64 (the portion where the light receiving signal circuit is formed) in addition to the light receiving element 38. .. The upper part of the light receiving signal circuit 64 is the upper side of the light receiving signal circuit 64 in the vertical direction (the vertical direction of the first sensor substrate 58), and the side of the light receiving signal circuit 64 is the horizontal direction of the light receiving signal circuit 64 (first). The right side direction and the left side direction of the sensor board 58 (left and right direction). As described above, the shield case 39 is formed so as to cover a predetermined region on the light receiving signal circuit 64 side in the region other than the digital signal circuit 68.

As shown in FIGS. 2 and 6, the shield case 39 is provided on the ceiling wall 39a provided on the upper side of the light receiving element 38, the right side wall 39b provided on the right side of the light receiving element 38, and the left side of the light receiving element 38. It is provided with a left side wall 39c.

The ceiling wall 39a is formed in a flat plate shape, has a length longer than the length from the front end to the rear end of the first sensor substrate 58, and is longer than the length from the right end to the left end of the first sensor substrate 58. It is formed to a length.

The right side wall 39b forms a flat plate-shaped vertical wall, is formed to have a length longer than the length from the front end to the rear end of the first sensor substrate 58, and is formed from the side of the first sensor substrate 58 to the first sensor substrate 58. It is formed to a height higher than that of the light receiving element 38 above. The lower end of the right side wall 39b is in contact with or near the right end of the first sensor substrate 58.

The left side wall 39c forms a flat plate-shaped vertical wall, is formed to have a length longer than the length from the front end to the rear end of the first sensor substrate 58, and is formed from the side of the first sensor substrate 58 to the first sensor substrate 58. It is formed to a height higher than that of the light receiving element 38 above. The left side wall 39c extends from the front end position 36a of the light projecting element 36 to the rear of the rear end position 36b in the front-rear direction. A slit 39d is formed on the left side wall 39c so that the second flexible substrate 62 can be arranged inside. Therefore, when the shield case 39 is inserted from the front so as to cover the first sensor substrate 58, the second flexible substrate 62 is passed through the slit 39d. The downward surface 39e of the slit 39d is located at a position below the first substrate surface 40a, and is arranged between the height position of the first substrate surface 40a and the second flexible substrate 62. Since the second flexible substrate 62 is arranged relatively rearward, if the downward surface 39e is relatively close to the first substrate surface 40a, the downward surface 39e is the first substrate surface 40a. It may be located higher than the height position.

As shown in FIG. 2, in the present embodiment, the shield case 39 is provided so as to cover a part in front of the light receiving element 38. On the other hand, the shield case 39 is not provided so as to cover the entire front and the entire rear of the light receiving element 38. The shield case 39 includes a resin film 72 in front of the light receiving element 38. The resin film 72 forms a transparent member that transmits the reflected light B. The resin film 72 is connected to a metal shield case 39 and has a function of shielding electromagnetic waves.

Further, an opening 39f is formed behind the shield case 39. The opening 39f abuts on the standing wall of the back plate 28 and is closed. Therefore, the back plate 28 shields the electromagnetic waves to some extent. Further, since the opening 39f opens only in a specific rearward direction at the rear end relatively distant from the light receiving element 38, the opening 39f is formed so that foreign electromagnetic waves do not easily reach the light receiving element 38. Has been done. Therefore, it has a function of shielding electromagnetic waves by the opening 39f and / or the back plate 28 of the shield case 39. In this way, the shield case 39, the resin film 72, the back plate 28, and the like form a shield structure that shields electromagnetic waves. As a modification, the shield case 39 may be formed so as to cover the rear of the light receiving element 38.

According to the water discharge device 1 according to the embodiment of the present invention described above, the photoelectric sensor 24 covers at least the upper side and the side surface of the light receiving element on the first substrate surface 40a of the main body substrate 40a. A metal shield case 39 provided on the side and shielding electromagnetic waves is provided, and the main body substrate 40 further includes a GND pattern 70 provided on the second substrate surface 40b side and shielding electromagnetic waves. As a result, the electromagnetic wave from the first substrate surface 40a side can be shielded by the shield case 39 against the light receiving element arranged on the first substrate surface 40a on one side of the main body substrate 40, and the second substrate surface 40b side can be shielded by the GND pattern 70. Can shield electromagnetic waves from. Therefore, electromagnetic waves can be shielded by forming the GND pattern 70 on the second substrate surface 40b side without forming the shield case 39 on the second substrate surface 40b side of the main body substrate 40, and the shield case 39 can be miniaturized. Therefore, the photoelectric sensor 24 can be miniaturized and the influence of electromagnetic noise due to electromagnetic waves can be suppressed.

Further, according to the water discharge device 1 according to the embodiment of the present invention, since the second substrate surface 40b of the main body substrate 40 is arranged toward the water discharge flow path 22, the GND provided on the second substrate surface 40b side is tentatively provided. Even if the pattern 70 is not provided up to the outer peripheral end of the main board 40, the electromagnetic waves can be shielded by the water in the water discharge flow path 22, and the influence of electromagnetic noise due to the electromagnetic waves from the second board surface 40b side is suppressed. it can.

Further, according to the water discharge device 1 according to the embodiment of the present invention, the shield case 39 is formed so as to cover at least the upper side and the side surface of the digital signal circuit 68 without covering the digital signal circuit 68. The size of the shield case 39 can be suppressed as compared with the case where the signal circuit is formed so as to cover the entire signal circuit. Therefore, by covering the digital signal circuit 68 with the shield case 39, the influence of electromagnetic noise due to electromagnetic waves can be suppressed, the shield case 39 can be miniaturized, and the photoelectric sensor 24 can be further miniaturized.

Further, according to the water discharge device 1 according to the embodiment of the present invention, the main body substrate 40 is connected to the light projecting element 36 with the second sensor substrate 60 including the digital signal circuit 68 connected to the light receiving element 38. It is formed as a separate substrate that is distinguished from the first sensor substrate 58 that includes the digital signal circuit 68. As a result, the shield case 39 is formed on a part of the substrate including both the digital signal circuit 68 and the digital signal circuit 69, and it is possible to prevent the shield case 39 from having a complicated shape. Therefore, the shield case 39 can be relatively easily attached only to the substrate side including the digital signal circuit 68.

Further, according to the water discharge device 1 according to the embodiment of the present invention, since the harness 34 is connected to the digital signal circuit of the electronic circuit of the main body substrate 40, the connection portion between the harness 34 and the electronic circuit is relatively electromagnetic. It is formed so that it is not easily affected by noise. As a result, the influence of electromagnetic noise due to electromagnetic waves can be further suppressed without arranging the connection portion between the harness 34 and the electronic circuit in the shield case 39. Further, it is possible to prevent the shield case 39 from being enlarged so as to cover the connection portion between the harness 34 and the electronic circuit, and the shield case 39 can be miniaturized.

Further, according to the water discharge device 1 according to the embodiment of the present invention, since the shield case 39 includes a wall surface arranged between the light emitting element 36 and the light receiving element 38, the shield case 39 provides the light emitting element 36. It is possible to prevent the detection light projected from the light receiving element 38 from reaching the light receiving element 38 due to reflection or the like inside the photoelectric sensor 24 and being detected by the light receiving element 38, causing erroneous detection of the light receiving element 38.

1 Water discharge device 10 Water faucet body 10a Outer member 16 Control unit 18 Water discharge unit 20 Water discharge port 22 Water discharge flow path 24 Photoelectric sensor 26 Sensor case 32 Circuit board 34 Harness 36 Floodlight element 36a Front end position 36b Rear end position 38 Light receiving element 39 Shield Case 40a 1st board surface 40b 2nd board surface 44 1st flexible board 48 Shading case 58 1st sensor board 60 2nd sensor board 62 2nd flexible board 64 Light receiving signal circuit 68 Digital signal circuit 69 Digital signal circuit 70 GND pattern A Detection light B Reflected light

Claims (6)

It is a water discharge device that discharges the supplied water.
The spout part that spouts water from the spout and
A spout channel that guides the water supplied from the water supply source to the spout, and
It is provided with a photoelectric sensor which is arranged in the water discharge portion and outputs a reception signal corresponding to the reception of the reflected light by receiving the reflected light of the projected detection light.
The photoelectric sensor is
The light projecting element that emits the detected light and
A light receiving element that receives the reflected light and
A sensor substrate on which an electronic circuit is formed, wherein the sensor substrate includes a first substrate surface on one side on which the light receiving element is arranged and a second substrate surface on the other side.
A metal shield case provided on the first substrate surface side so as to cover at least the upper side and the side of the light receiving element on the first substrate surface of the sensor substrate and shield electromagnetic waves is provided.
The sensor substrate is a water discharge device provided on the surface side of the second substrate and further provided with a GND pattern that shields electromagnetic waves. The water discharge device according to claim 1, wherein the second substrate surface of the sensor substrate is arranged toward the water discharge flow path. The sensor board is arranged in a region where the analog signal circuit connected to the light receiving element and the digital signal circuit connected to the light projecting element are distinguished.
The water discharge device according to claim 2, wherein the shield case is formed so as to cover at least the upper side and the side surface of the analog signal circuit without covering the digital signal circuit. 3. The sensor substrate is formed as a separate substrate that distinguishes the substrate including the analog signal circuit connected to the light receiving element from the substrate including the digital signal circuit connected to the light projecting element. The water spouting device described in. The photoelectric sensor further includes a harness that is electrically connected to a control unit that controls the water discharge device.
The water discharge device according to claim 3 or 4, wherein the harness is connected to a digital signal circuit of an electronic circuit of the sensor board. The water discharge device according to any one of claims 1 to 5, wherein the shield case includes a wall surface arranged between the light emitting element and the light receiving element.

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