JP7340145B2 - Water discharging device - Google Patents

Description

The present invention relates to a water discharging device, and particularly to a water discharging device for discharging supplied water.

Conventionally, as shown in Patent Document 1, a water discharging device provided with a photoelectric sensor is known. A photoelectric sensor detects an object by having a light receiving element receive reflected light of detection light projected by a light projecting element. Since the light receiving element of such a photoelectric sensor sends out an analog signal as a light reception signal, it is easily affected by electromagnetic noise caused by electromagnetic waves. Therefore, electromagnetic waves have been shielded by providing a metal shield case that completely surrounds the light receiving element and the inner case.

JP2017-203348A

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

Therefore, the present invention has been made to solve the above-mentioned problems of the prior art, and it is possible to prevent electromagnetic waves by forming a GND pattern without forming a shield case that covers the second board surface side of the sensor board. It is an object of the present invention to provide a water discharging device that can shield a photoelectric sensor, miniaturize a photoelectric sensor, and suppress the influence of electromagnetic noise caused by electromagnetic waves.

In order to solve the above-mentioned problems, the present invention provides a water spouting device that spouts supplied water, which includes a spouting section that spouts water from a spout, and a water spout that guides water supplied from a water supply source to the spout. The photoelectric sensor includes a water spouting flow path and a photoelectric sensor disposed within the water spouting section and outputting a reception signal corresponding to the reception of the reflected light by receiving the reflected light of the projected detection light. The sensor includes a light emitting element that emits the detection light, a light receiving element that receives the reflected light, and a sensor board on which an electronic circuit is formed, and the sensor board has one side on which the light receiving element is disposed. and a second substrate surface on the other side. The sensor board includes a metal shield case provided on the surface side and shields electromagnetic waves, and the sensor board further includes a GND pattern provided on the second substrate surface side and shields electromagnetic waves.
In the present invention configured in this way, 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 the metal plate is provided on the first substrate surface side to shield electromagnetic waves. The sensor board further includes a GND pattern that is provided on the second board surface side and shields electromagnetic waves. As a result, the shield case can shield electromagnetic waves from the first board surface side to the light receiving element arranged on the first board surface on one side of the sensor board, and the GND pattern can shield electromagnetic waves from the second board surface side. . Therefore, by forming a GND pattern on the second substrate surface side of the sensor substrate without forming a shield case on the second substrate surface side, electromagnetic waves can be shielded and the shield case can be miniaturized. Therefore, the photoelectric sensor can be downsized and the influence of electromagnetic noise caused by 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, the second substrate surface of the sensor substrate is arranged facing the water discharge flow path, so even if the GND pattern provided on the second substrate surface side extends to the outer peripheral edge of the sensor substrate. Even if it is not provided, electromagnetic waves can be shielded by the water in the water discharge flow path, and the influence of electromagnetic noise caused by electromagnetic waves from the second substrate surface side can be suppressed.

In the present invention, preferably, the sensor board is arranged in a region where an analog signal circuit connected to the light-receiving element and a digital signal circuit connected to the light-emitting element are separated, and the shield case includes: It is formed to cover at least the top and sides of the analog signal circuit without covering the digital signal circuit.
In the present invention configured in this way, the shield case is formed so as to cover at least the top and sides of the analog signal circuit without covering the digital signal circuit, so that the entire analog signal circuit and digital signal circuit are covered. The size of the shield case can be reduced compared to the case where the shield case is formed to cover the shield case. Therefore, by covering the analog signal circuit with the shield case, the influence of electromagnetic noise due to electromagnetic waves can be suppressed, and the shield case can be made smaller, allowing the photoelectric sensor to be made more compact.

In the present invention, preferably, the sensor board is a separate board in which a board including the analog signal circuit connected to the light receiving element is separated from a board including the digital signal circuit connected to the light projecting element. form as.
In the present invention configured in this way, the sensor board is a separate board in which the board including the analog signal circuit connected to the light receiving element is separated from the board including the digital signal circuit connected to the light emitting element. Form. Thereby, 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 side of the board containing the analog signal circuit.

In the present invention, preferably, the photoelectric sensor further includes a harness electrically connected to a control unit that controls the water discharging device, and the harness is connected to a digital signal circuit of an electronic circuit of the sensor board. be done.
In the present invention configured in this way, the harness is connected to the digital signal circuit of the electronic circuit of the sensor board, so the connecting portion between the harness and the electronic circuit is formed relatively less susceptible to electromagnetic noise. Ru. Thereby, the influence of electromagnetic noise caused by electromagnetic waves can be further suppressed without disposing the connecting portion between the harness and the electronic circuit inside the shield case. Further, it is possible to prevent the shield case from increasing in size so as to cover the connecting portion between the harness and the electronic circuit, and the shield case can be downsized.

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

According to the water discharging device of the present invention, the photoelectric sensor can be downsized and the influence of electromagnetic noise caused by electromagnetic waves can be suppressed.

1 is a schematic configuration diagram schematically showing a water discharging system including a water discharging device according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of a photoelectric sensor of the water discharging device of FIG. 1. FIG. FIG. 2 is a top view of the photoelectric sensor of the water discharging device of FIG. 1 when viewed from above, with the ceiling portion of the sensor case, the ceiling portion of the light shielding case, and the ceiling portion of the shield case removed. 4 is a sectional view taken along the line IV-IV in FIG. 3. FIG. FIG. 2 is a sectional view showing a cross section taken along line V-V in FIG. 1 with a light shielding case removed. FIG. 6 is a partially enlarged sectional view showing the photoelectric sensor of FIG. 5 with the sensor case and light-shielding case removed. FIG. 3 is a diagram showing the circuit board of the photoelectric sensor of FIG. 2 viewed from below.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A water spouting system including a water spouting device according to an embodiment of the present invention will be described below with reference to the accompanying drawings.
First, FIG. 1 is a schematic configuration diagram schematically showing a water discharging system including a water discharging device according to an embodiment of the present invention. The water discharging device 1 is an automatic faucet type water discharging device that detects a user's fingers and/or an object and automatically discharges water.
As shown in FIG. 1, a water spouting system 2 including a water spouting device 1 according to an embodiment of the present invention is a water spouting system for a washbasin. The water spouting system 2 includes a water spouting device 1 that spouts supplied water, a bowl section 4 that receives water spouted from the water spouting device 1, and a drainage channel 6 that drains water received by the bowl section 4. There is.
The water spouting device 1 of the water spouting system 2 can be installed in a part where water needs to be spouted, such as a water spouting device of a water spouting system for a kitchen, a water spouting device of a water spouting system for a urinal, a water spouting device of a water spouting system for a hand washing basin, etc. .

The water spouting device 1 is a water spouting device that spouts water supplied from a water supply source (not shown), and is installed on a counter 8 or the like.
The water discharging device 1 includes a faucet main body 10 fixed to a counter 8, a water supply channel 12 extending from a water supply source, a solenoid valve 14 that opens and closes the water supply channel 12, and a control unit 16 that controls the solenoid valve 14. There is.

The solenoid valve 14 is electrically connected to a control section 16, which will be described later, and is controlled by the control section 16, which will be described later.

The faucet main body 10 includes a water spout 18 extending upward on the bowl portion 4 side, a water spout flow path 22 that guides water supplied from a water supply source to a water spout 20, and a photoelectric sensor 24 disposed within the water spout 18. It is equipped with
A water discharge flow path 22, a photoelectric sensor 24, and the like are arranged in the inner space of the hollow rectangular columnar outer shell member 10a of the faucet body 10. The outer shell member 10a is made of metal. The outer shell member 10a is not limited to being made of metal, but may be made of resin in part, and may have a metal-like surface finish such as metal plating or metal vapor deposition on the resin surface. Good too. The outer shell member 10a may be cylindrical.

The water spouting section 18 is formed to spout water from the water spout 20 . The outer shape of the water spouting portion 18 is formed by the outer shell member 10a of the faucet main body 10. The water spouting part 18 is formed so that a water spout 20 for spouting water is arranged inside the opening of the outer shell member 10a. The water spout 20 is formed at the downstream end of the water spout channel 22 . The water discharge channel 22 forms a channel through which water passes, and is filled with water when the water discharge device 1 is used. Note that water in this embodiment is not limited to so-called tap water, well water, etc., but includes hot water whose temperature is controlled by a temperature control device (not shown), so-called modified functional water (acidic, alkaline, sterilizing effect water, etc.). It also includes functional water (such as water with

The control unit 16 is a control unit that controls the water discharging device 1 . The control section 16 is electrically connected to each functional section such as the electromagnetic valve 14 and the photoelectric sensor 24, and can mutually transmit and receive electrical signals, so that each functional section can be electrically operated. For example, the control unit 16 has a function of controlling the opening/closing operation of the electromagnetic valve 14, the detection operation of the photoelectric sensor 24, and the like. The control unit 16 receives a reception signal (detection signal) from the photoelectric sensor 24 and controls the solenoid valve 14 according to a pre-stored program or the like. The control unit 16 includes a storage device (not shown) such as a memory and a calculation device (not shown) that can control each device. The control unit 16 has a function of controlling the water spouting from the water spouting unit 18 based on the detection of the user by the photoelectric sensor 24, for example, by controlling each device.

The photoelectric sensor 24 is disposed within the water spouting section 18 and receives reflected light B of the detected detection light A projected, thereby sending a reception signal (detection signal) corresponding to the reception of the reflected light B to the control section 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 spouting part 18, and is arranged facing downward inside the outer shell member 10a. Furthermore, when the water spout 20 of the water spouting section 18 is viewed from the front of the water spout 20, the photoelectric sensor 24 is arranged inside the outer shell member 10a along with the water spout 20.

In FIG. 1, the direction in which the photoelectric sensor 24 emits detection light is the front side, the opposite side to the front side is the rear side, and the front and back direction of the photoelectric sensor 24 is indicated by an arrow X. The water spouting direction of the water spout 20 of the water spouting part 18 is the front side of the water spout 20, and the water spout flow path 22 side of the water spout 20 is the rear side of the water spout 20. The front direction of the water spout 20 and the front direction of the photoelectric sensor 24 generally match, and the rear direction of the water spout 20 and the rear direction of the photoelectric sensor 24 generally match.
The water discharge channel 22 side of the photoelectric sensor 24 is defined as the lower side, the side opposite to the lower side is defined as the upper side, and the vertical direction of the photoelectric sensor 24 is indicated by an arrow Y. Note that the right-hand direction when viewing the photoelectric sensor 24 from the front side is the right side, the opposite side 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, or outer diameter of the water spouting portion 18 can be made smaller depending on the orientation of the photoelectric sensor 24. can. Therefore, the water spouting section 18 and the water spouting device 1 can be downsized.

Next, as shown in FIGS. 2 to 4, the photoelectric sensor 24 will be explained.
FIG. 2 is an exploded perspective view of the photoelectric sensor of the water discharging device in FIG. 1, and FIG. 3 is an exploded perspective view of the photoelectric sensor of the water discharging device in FIG. 4 is a top view seen from above in the state, and FIG. 4 is a sectional view taken along the line IV-IV in FIG. 3.

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

As shown in FIG. 2, the sensor case 26 accommodates a circuit board 32 therein. The sensor case 26 is formed to cover the circuit board 32, the light emitting element 36, the light receiving element 38, etc., and forms a waterproof case. The sensor case 26 has a rear opening 26a to which the back plate 28 and harness 34 are attached, a detection light window 26b that is a member that transmits the detection light A, and a detection light window 26b that allows the detection light A to pass through the reflected light B that is reflected by the user's fingers or the like. It is provided with a reflective light window 26c which is a transparent 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) in the vertical wall portion 28b, through which the harness 34 is passed. The harness hole 28a forms an opening with a height slightly larger than the diameter of the harness 34 so that the harness 34 can pass therethrough.
A resin layer (not shown) is formed 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 hardening the resin by potting, and has a waterproof property that prevents water from entering from the outside of the photoelectric sensor 24 to the internal circuit board 32 side.

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 inside the cover to the harness board 42. The harness 34 is connected to a digital signal circuit of the electronic circuit of the main body 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 (eg, chip type) light projecting element. The light projecting element 36 is, for example, an LED. Further, a light emitting portion 36e of the light projecting element 36 is arranged on the main body substrate 40. The light emitting section 36e of the light projecting element 36 is configured to project infrared light.

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

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

As shown in FIG. 5, the main body substrate 40 is formed into a thin plate shape. The main 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 channel 22 side. The main body board 40 extends in the front-back direction and left-right direction of the photoelectric sensor 24. The main body board 40 is formed of a rigid type printed circuit board.

As shown in FIGS. 2 and 3, the main body board 40 further includes a first sensor board 58 on which the light-receiving element 38 is placed, and a light-emitting element arranged on the side of the first sensor board 58. 36 is arranged between 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. The second flexible substrate 62 is a connection substrate.

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

The light reception signal circuit 64 is disposed within the first sensor substrate 58 which is of a rigid type and has a relatively simple rectangular shape. As a result, the relatively simple box-shaped shield case 39 can suppress the light reception signal circuit 64 from being affected by electromagnetic noise, and the photoelectric sensor 24 can be suppressed from being affected by electromagnetic noise. can. The light receiving signal circuit 64 is formed to electrically connect the light receiving element 38 and the signal processing section 66, and the digital signal circuit 69 is formed to electrically connect the signal processing section 66 and the harness 34. The digital signal circuit 69 is formed through the second flexible substrate 62 and the second sensor substrate 60, as will be described later. In FIG. 3, the shapes of the digital signal circuits 68 and 69 are shown by way of example, and the digital signal circuits 68 and 69 schematically show portions (areas) in which the digital signal circuits are formed. Note that 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 arranges 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, which is connected to the light emitting element 36, in separate areas. . Note that the circuit board 32 distinguishes a first sensor board 58 including a light receiving signal circuit 64 connected to the light receiving element 38 from a second sensor board 60 including a digital signal circuit 68 connected to the light projecting element 36. It is formed as a separate substrate.

The first sensor board 58 further includes a GND pattern (ground pattern) 70 that is provided on the second board surface 40b side and shields electromagnetic waves. Since the second substrate surface 40b of the first sensor board 58 is disposed toward the water spouting channel 22 side, the GND pattern 70 is disposed toward the water discharging channel 22 side. The GND pattern 70 is formed in a flat plate shape so as to cover almost the entire second substrate surface 40b. The GND pattern 70 includes a GND pattern, a GND solid layer, and a shielding GND pattern. The GND pattern 70 only needs to have a function of shielding electromagnetic waves to a certain extent. The GND pattern 70 being provided on the second substrate surface 40b side includes the case where the GND pattern 70 is disposed 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, but may be provided as an intermediate layer in the first sensor substrate 58. The GND pattern 70 and the shield case 39 are formed to have the same electrical potential.

As shown in FIG. 3, the second sensor board 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 transmitting digital signals 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 by the shield case 39. The digital signal circuit 68 is formed to electrically connect the harness 34 and the light projecting element 36. The harness 34 is connected to digital signal circuits (digital signal circuit 68 and digital signal circuit 69).

The second flexible substrate 62 is formed into a thin plate shape and has flexibility. The second flexible board 62 is formed of a flexible type printed board. The second flexible substrate 62 is formed at a position so as to extend the intermediate layer between the first sensor substrate 58 and the second sensor substrate 60. For example, the second flexible substrate 62 is formed by removing the surface layer of a rigid type substrate such as the first sensor substrate 58 (or the second sensor substrate 60) to expose the inner layer. Therefore, for example, the second flexible substrate 62 may be formed by removing the surface layer of a rigid type substrate to 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 second sensor substrate 60) in the height direction (vertical direction). Further, the height (height in the vertical direction) of the upper surface 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 substrate 62 includes a digital signal circuit 68 for transmitting digital signals on the second flexible substrate 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 by the shield case.

The harness board 42 is fixed to the main board 40 in a vertical vertical wall shape. The vertical height of the harness board 42 is smaller than its horizontal width. The height of the harness board 42, that is, the vertical height (length) of the photoelectric sensor 24 is formed to 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 board.

A small hole 42a (see FIG. 4) is formed in the harness board 42, and the signal wire 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 Be 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 into a thin plate shape. The first flexible board 44 is bent approximately 90 degrees between the main board 40 extending in the front-rear direction (X direction) and the harness board 42 extending in the up-down 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. Note that the circuit board 32 may be formed of a rigid flexible board in which a portion of the first flexible board 44 is bent.

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 projecting element 36 and the light receiving element 38. The front end of the first light shielding wall 50 extends to near the inner side of the front surface of the sensor case 26, and the rear end extends to near the harness board 42. The entire first light shielding wall 50 in the vertical direction 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 that is higher than the second flexible substrate 62 extends from the front end position 36a of the light projecting element 36 to the rear end position 36b and above the second flexible substrate 62. It is formed all the way to the rear of the second flexible substrate 62. A slit 50a is formed in the first light shielding wall 50, in which the second flexible substrate 62 can be placed. Therefore, when the light shielding case 48 is inserted from the front so as to cover the main body board 40, the second flexible board 62 is passed through the slit 50a. The light shielding case 48 is made of resin that can shield detection light. Since the light-shielding case 48 is made of a light-shielding material, it does not have the function of effectively shielding electromagnetic waves. With such a configuration, the light-shielding case 48 prevents the detection light projected from the light-emitting element 36 from reaching the light-receiving element 38 due to reflection or the like and being detected by the light-receiving element 38, thereby suppressing the occurrence of false detection. I can do it.

The shield case 39 is formed in the shape of a rectangular parallelepiped box. The shield case 39 is configured to house the first sensor board 58 with the light receiving element 38 therein. The shield case 39 is attached inside the light shielding case 48. The shield case 39 has a slightly smaller size than the light shielding case 48. The shield case 39 forms a metal shield case that shields electromagnetic waves. Note that a part of the shield case 39 may be formed of another member having an electromagnetic wave shielding function.

The shield case 39 is formed to at least partially cover 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 so as to cover at least both the upper side and the side of the light receiving element 38 on the first substrate surface 40a of the main body substrate 40. The upper side of the light receiving element 38 is the upper side of the light receiving element 38 in the vertical direction (the vertical direction of the first sensor board 58), and the side of the light receiving element 38 is the side in the left and right direction of the light receiving element 38 (the vertical direction of the first sensor board 58). (horizontal direction). The shield case 39 is formed so as to cover at least both the upper side and the side of the light receiving signal circuit 64 (the part where the light receiving signal circuit is formed) in addition to the light receiving element 38 without covering the digital signal circuit 68. . The upper side 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 board 58), and the side of the light receiving signal circuit 64 is the side of the light receiving signal circuit 64 in the horizontal direction (the first These are the right side direction and the left side direction (left and right direction) of the sensor board 58. As described above, the shield case 39 is formed to cover a predetermined area on the light receiving signal circuit 64 side out of areas other than the digital signal circuit 68.

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

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

The right side wall 39b forms a flat vertical wall, has a length longer than the length from the front end to the rear end of the first sensor board 58, and extends from the side of the first sensor board 58 to the first sensor board 58. It is formed to a higher height than 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 board 58.

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

As shown in FIG. 2, in this embodiment, the shield case 39 is provided so as to cover a part of the 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 rear sides 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 allows the reflected light B to pass therethrough. The resin film 72 is connected to the metal shield case 39 and has a function of shielding electromagnetic waves.

Furthermore, an opening 39f is formed at the rear of the shield case 39. This opening 39f comes into contact with the vertical wall of the back plate 28 and is closed. Therefore, the back plate 28 shields electromagnetic waves to some extent. Furthermore, since the opening 39f opens only in a specific backward direction at the rear end that is relatively far away from the light receiving element 38, the opening 39f is formed in a manner that makes it difficult for external electromagnetic waves to reach the light receiving element 38. has been done. Therefore, the opening 39f of the shield case 39 and/or the back plate 28 has the function of shielding electromagnetic waves. 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. In addition, as a modification, the shield case 39 may be formed to cover the rear of the light receiving element 38.

According to the water discharging device 1 according to the embodiment of the present invention described above, the photoelectric sensor 24 is mounted on the first substrate surface 40a of the main body substrate 40 so as to cover at least the upper side and the side of the light receiving element on the first substrate surface 40a. The main board 40 includes a metal shield case 39 that is provided on the side and shields electromagnetic waves, and the main board 40 further includes a GND pattern 70 that is provided on the second board surface 40b side and shields electromagnetic waves. As a result, the shield case 39 can shield electromagnetic waves from the first substrate surface 40a side to the light receiving element arranged on the first substrate surface 40a on one side of the main substrate 40, and the GND pattern 70 can shield the light receiving element from the first substrate surface 40a side. Can shield electromagnetic waves from Therefore, by forming the GND pattern 70 on the second substrate surface 40b side of the main body substrate 40 without forming the shield case 39 on the second substrate surface 40b side, electromagnetic waves can be shielded and the shield case 39 can be miniaturized. Therefore, the photoelectric sensor 24 can be downsized and the influence of electromagnetic noise caused by electromagnetic waves can be suppressed.

Further, according to the water discharging device 1 according to the embodiment of the present invention, the second substrate surface 40b of the main body substrate 40 is arranged facing the water discharging flow path 22, so that if the GND provided on the second substrate surface 40b side is Even if the pattern 70 is not provided to the outer peripheral end of the main substrate 40, the water in the water discharge channel 22 can shield electromagnetic waves, suppressing the influence of electromagnetic noise due to electromagnetic waves from the second substrate surface 40b side. can.

Furthermore, according to the water discharging device 1 according to the embodiment of the present invention, the shield case 39 is formed so as to cover at least the top and sides of the digital signal circuit 68 without covering the digital signal circuit 68. The size of the shield case 39 can be reduced compared to the case where the shield case 39 is formed 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, and the shield case 39 can be made smaller, so that the photoelectric sensor 24 can be further made smaller.

Further, according to the water discharging device 1 according to the embodiment of the present invention, the main body substrate 40 connects the second sensor substrate 60 including the digital signal circuit 68 connected to the light receiving element 38 to the light emitting element 36. It is formed as a separate substrate distinct from the first sensor substrate 58 in which the digital signal circuit 68 is included. Thereby, 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 side of the board that includes the digital signal circuit 68.

Further, according to the water discharging 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 board 40, the connection portion between the harness 34 and the electronic circuit is relatively electromagnetic. Formed to be less susceptible to noise. Thereby, the influence of electromagnetic noise due to electromagnetic waves can be further suppressed without disposing the connecting portion between the harness 34 and the electronic circuit inside the shield case 39. Further, it is possible to prevent the shield case 39 from increasing in size so as to cover the connecting portion between the harness 34 and the electronic circuit, and the shield case 39 can be reduced in size.

Furthermore, according to the water discharging device 1 according to the embodiment of the present invention, since the shield case 39 includes a wall surface disposed between the light emitting element 36 and the light receiving element 38, the shield case 39 allows the light emitting element 36 to The detection light projected from the photoelectric sensor 24 reaches the light receiving element 38 due to reflection inside the photoelectric sensor 24 and is detected by the light receiving element 38, thereby suppressing the occurrence of false detection of the light receiving element 38.

1 Water discharging device 10 Faucet main body 10a Outer shell member 16 Control section 18 Water discharging section 20 Water spout 22 Water discharging channel 24 Photoelectric sensor 26 Sensor case 32 Circuit board 34 Harness 36 Light emitting element 36a Front end position 36b Rear end position 38 Light receiving element 39 Shield Case 40a First board surface 40b Second board surface 44 First flexible board 48 Light shielding case 58 First sensor board 60 Second sensor board 62 Second 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 (5)

A water spouting device that spouts supplied water,
A water spout unit that spouts water from a water spout;
a water outlet channel that guides water supplied from the water supply source to the water outlet;
a photoelectric sensor that is disposed within the water spouting section and outputs a reception signal corresponding to the reception of the reflected light by receiving the reflected light of the projected detection light;
The above photoelectric sensor is
a light emitting element that emits the detection light;
a light receiving element that receives the reflected light;
a sensor substrate on which an electronic circuit is formed, the sensor substrate comprising a first substrate surface on one side on which the light receiving element is disposed, 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 above and on the sides of the light receiving element on the first substrate surface of the sensor substrate and shielding electromagnetic waves;
The sensor board further includes a GND pattern provided on the second board surface side and shielding electromagnetic waves,
The second substrate surface of the sensor substrate is arranged toward the water discharge flow path ,
The water discharging device is characterized in that the sensor board is arranged along the water discharging channel and is located inside the width of the water discharging channel. A water spouting device that spouts supplied water,
A water spout unit that spouts water from a water spout;
a water outlet channel that guides water supplied from the water supply source to the water outlet;
a photoelectric sensor that is disposed within the water spouting section and outputs a reception signal corresponding to the reception of the reflected light by receiving the reflected light of the projected detection light;
The above photoelectric sensor is
a light emitting element that emits the detection light;
a light receiving element that receives the reflected light;
a sensor substrate on which an electronic circuit is formed, the sensor substrate comprising a first substrate surface on one side on which the light receiving element is disposed, 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 above and on the sides of the light receiving element on the first substrate surface of the sensor substrate and shielding electromagnetic waves;
The sensor board further includes a GND pattern provided on the second board surface side and shielding electromagnetic waves, and includes an analog signal circuit connected to the light receiving element and a digital signal circuit connected to the light projecting element. The circuits are placed in differentiated areas,
The second substrate surface of the sensor substrate is arranged to face the water discharge flow path , and the shield case is formed so as to cover at least the upper and lateral sides of the analog signal circuit without covering the digital signal circuit. A water discharging device characterized by: 2. The sensor board is configured such that a board including the analog signal circuit connected to the light receiving element is formed as a separate board from a board including the digital signal circuit connected to the light emitting element. The water discharging device described in . The photoelectric sensor further includes a harness electrically connected to a control unit that controls the water discharging device,
The water discharging device according to claim 2 or 3, wherein the harness is connected to a digital signal circuit of an electronic circuit of the sensor board. The water discharging device according to any one of claims 1 to 4, wherein the shield case includes a wall surface disposed between the light projecting element and the light receiving element.

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