JP7634849B2 - Ultraviolet irradiation equipment - Google Patents

Description

The technology disclosed in this specification relates to an ultraviolet irradiation device.

Conventionally, an illumination device that illuminates light has been known, for example, as described in Patent Document 1. The interior light in Patent Document 1 is attached to a vehicle and has a diode in the lamp body that emits ultraviolet light toward the outside. With such an interior vehicle light, it is said that the irradiated area inside the vehicle cabin can be sterilized by the ultraviolet light.

To prevent occupants in the vehicle cabin from being mistakenly exposed to ultraviolet light, the interior light is equipped with an occupant detection sensor that detects the presence or absence of occupants in the vehicle cabin, such as an ignition sensor that detects the ignition of the engine and a lock sensor that detects whether the doors are locked or unlocked. The ultraviolet light source is configured to be turned on in response to a signal being input from the occupant detection sensor indicating that no occupants are in the vehicle cabin.

JP 2012-254673 A

In recent years, with the ever-increasing need for sterilization, there has been an increasing demand to install retrofit ultraviolet irradiation devices in vehicles that do not have ultraviolet light sources. In order to prevent ultraviolet light from being mistakenly irradiated on passengers in the vehicle cabin, such ultraviolet irradiation devices are also connected to occupant detection sensors.

Specifically, the signal detected by the occupant detection sensor is drawn by a cable from an output section provided on the instrument panel and input to an input section of an ultraviolet irradiation device mounted, for example, on the ceiling of the vehicle.

However, with this configuration, the cable must be as long as 1 to 3 meters to reach the ceiling, making it susceptible to electromagnetic waves emitted by smartphones and other electronic devices that passengers bring into the vehicle, and there is a risk that noise will cause malfunctions.

The technology disclosed in this specification has been developed in consideration of the above circumstances, and aims to provide an ultraviolet irradiation device that can reduce noise caused by external electromagnetic waves in the occupant detection signal output from the vehicle.

The technology disclosed in this specification to solve the above problem is an ultraviolet irradiation device that is attached to a mounting surface inside a vehicle and irradiates ultraviolet rays toward the interior of the vehicle, and includes a board arranged along the mounting surface, and a connector section to which a vehicle occupant detection signal is input via a signal line from a direction along the plate surface of the board, and a conductive plate section having electrical conductivity is superimposed on the opposite side of the connector section opposite the opposing surface that faces the mounting surface.

According to the above configuration, the conductive plate portion can suppress electromagnetic waves that affect the wiring inside the connector portion from the opposite side of the connector portion. Furthermore, since a pseudo-capacitor is formed between the signal line arranged inside the connector portion and the conductive plate portion, this pseudo-capacitor reduces noise in the occupant detection signal, and a highly accurate occupant detection signal can be input to the ultraviolet irradiation device.

The connector portion is disposed on a board-side facing surface of the board that faces the mounting surface, and the conductive plate portion is disposed on the board-side opposite surface opposite the board-side facing surface, and may be provided with a conductive extension portion that rises toward the board, is inserted into an insertion hole provided in the board, and covers the periphery of the connector portion.

With the above configuration, the conductive plate portion surrounds the connector portion, increasing the capacitance of the pseudo-capacitor, thereby further reducing noise in the occupant detection signal input to the ultraviolet irradiation device.

The conductive extension may be conductively connected to a discharge circuit provided on the substrate. According to the above configuration, the conductive extension can be used to form a discharge path for the ultraviolet irradiation device.

The substrate may include a conductive substrate shield portion that covers the substrate-side opposite surface of the substrate opposite the substrate-side opposite surface that faces the mounting surface, and the conductive plate portion may be integrally connected to the substrate shield portion.

According to the above configuration, the conductive board shield portion can suppress electromagnetic waves that affect the board from the side opposite the board side of the board. In addition, since the board shield portion and the conductive plate portion are integrally connected, the number of parts can be reduced and the configuration can be simplified compared to a configuration in which the board shield portion and the conductive plate portion are separate parts.

The technology disclosed in this specification can reduce noise caused by external electromagnetic waves in the occupant detection signal output from the vehicle.

FIG. 1 is a perspective view of a deep ultraviolet irradiation device according to a first embodiment. Exploded perspective view of deep ultraviolet irradiation device A perspective view of the inside of a deep ultraviolet irradiation device Perspective view of sheet metal shield Plan view of deep ultraviolet irradiation equipment 5A-5C sectional view of FIG. FIG. 13 is a partially enlarged perspective view of a deep ultraviolet irradiation device according to a second embodiment. FIG. 13 is a partially enlarged perspective view of a deep ultraviolet irradiation device according to another embodiment.

<Embodiment 1>
A first embodiment in which the ultraviolet irradiation device disclosed in this specification is applied to a deep ultraviolet irradiation device 10 that emits deep ultraviolet light will be described with reference to Figures 1 to 6. Each drawing shows an X-axis, a Y-axis, and a Z-axis, and each axis direction is drawn so as to be a common direction in each drawing. Hereinafter, the X-axis direction will be described as the right direction or width direction, the Y-axis direction will be described as the forward direction, and the Z-axis direction will be described as the upward direction, but the directions are not limited to this embodiment. In addition, for multiple identical members, a reference symbol may be attached to one member and the reference symbols of the other members may be omitted.

The deep ultraviolet irradiation device 10 is configured to include a first board 55 on which a deep ultraviolet LED is mounted, a second board (one example of a board) 70 on which a visible light LED 80 is mounted, and a housing 11 that is generally flat and box-shaped and contains the first board 55 and the second board 70 inside.

The housing 11 is made of resin, and as shown in FIG. 2, is configured with two covers 12, 32 that cover the plate surface of the approximately rectangular holding member 40 from both the front and back (top and bottom). In detail, the holding member 40 is made of resin and includes an approximately rectangular plate-shaped holding plate portion 41 and a frame-shaped frame portion 42 that rises from the peripheral portion of the holding plate portion 41 in the vertical direction (Z direction), and the housing 11 is configured with two covers: an upper cover 12 that is shallow dish-shaped as a whole and covers the upper surface of the holding plate portion 41 and is fitted inside the frame portion 42, and a lower cover 32 that is plate-shaped and covers the lower surface of the holding plate portion 41 and is fitted inside the frame portion 42. The deep ultraviolet irradiation device 10 is attached to the vehicle with the upper cover 12 facing the mounting surface of the vehicle, such as the ceiling.

The ceiling wall 13 of the upper cover 12 of the housing 11, which is arranged opposite the upper surface of the holding plate portion 41, is composed of a front ceiling wall 14 that is inclined rearward and upward from its front end and covers approximately 1/3 of the front portion of the holding plate portion 41, and a rear ceiling wall 15 that extends horizontally from the front ceiling wall 14 and covers approximately 2/3 of the rear portion of the holding plate portion 41 in a state parallel to the holding plate portion 41 (see Figure 1).

A cover-side peripheral wall 16 that rises diagonally downward and outward is provided on the peripheral edge of the ceiling wall 13 of the upper cover 12. The outer periphery dimension of the tip (lower end) of this cover-side peripheral wall 16 in the rising direction is set to a dimension that allows it to be fitted inside the frame-shaped portion 42 of the holding member 40 described above.

The front wall 17 of the cover side peripheral wall 16, which extends to the front end of the front ceiling wall 14, has multiple slit-shaped exhaust ports 18 extending vertically across the front ceiling wall 14 (see FIG. 5). The rear wall 21 of the cover side peripheral wall 16, which extends to the rear end of the rear ceiling wall 15, has an opening 22 for a connector jack, an opening 23 for a remote control jack, and an opening 24 for a slide switch timer arranged side by side (see FIG. 1).

The upper cover 12 is fixed to the holding member 40 by fastening bolts B1 to a plurality of cylindrical upper cover fastening portions 46 (see Figures 2 and 3) that rise from the holding plate portion 41 of the holding member 40. When the upper cover 12 is fixed to the holding member 40, a space is formed between the ceiling wall 13 of the upper cover 12 and the holding plate portion 41.

When the upper cover 12 is fixed to the holding member 40, the lower end of the cover side peripheral wall 16 other than the above-mentioned front wall 17 is set to have a gap between it and the holding plate portion 41 of the holding member 40, and air can be drawn into the internal space of the housing 11 through this gap. In the following description, the space below the front ceiling wall 14 of the internal space of the housing 11 is referred to as the front space R1 (not shown), the space below the rear ceiling wall 15 is referred to as the rear space R2 (see FIG. 6), and the gap between the cover side peripheral wall 16 and the holding plate portion 41 is referred to as the intake port. The opening area of the entire intake port is set to be larger than the opening area of the entire exhaust port 18 described above.

On the other hand, the lower cover 32 of the housing 11 is a generally rectangular plate, and is slightly curved overall so that the central portion bulges slightly downward. The outer peripheral dimensions of the lower cover 32 are set to allow it to be fitted inside the frame portion 42 of the holding member 40 described above.

As shown in FIG. 2, a locking portion 33 protrudes outward from the center of each of the four sides (edges) of the lower cover 32. The lower cover 32 is fixed to the holding member 40 by locking these locking portions 33 to the hole edges of the locking holes 47 provided in the holding plate portion 41 of the holding member 40 described above.

A part of the lower cover 32 that corresponds to the front ceiling wall 14 of the upper cover 12 (a part of the part that corresponds to the front space R1) has a housing side opening 35 that is rectangular in shape and elongated in the width direction (left-right direction) and penetrates the plate surface.

On the other hand, in the holding member 40 assembled with the lower cover 32, a holding member side opening (not shown) is provided penetrating the plate surface at a position facing the housing side opening 35 of the holding plate portion 41. In other words, when the lower cover 32 and the holding member 40 are assembled, the housing side opening 35 and the holding member side opening are in communication in the vertical direction. A heat dissipation member 50 is fitted into these openings in communication.

The heat dissipation member 50 is made of aluminum or an aluminum alloy, and has two circular light-transmitting holes (not shown) for transmitting light emitted from two deep ultraviolet LEDs arranged inside the housing 11 to the outside of the housing 11 as described below. The heat dissipation member 50 is positioned relative to the holding member 40 and the lower cover 32 with the lower surface exposed to the outside of the housing 11 and the upper surface exposed to the inside of the housing 11 (inside the front space R1).

Two first boards 55 are attached to the heat dissipation member 50, which is positioned on the holding member 40 and the lower cover 32, by fastening bolts B2. The two first boards 55 are attached to the heat dissipation member 50, lined up in the left-right direction and crossing each other to form a flat V-shape when viewed from the front.

The first substrate 55 is made of aluminum or an aluminum alloy. When the first substrate 55 is attached to the heat dissipation member 50, a deep ultraviolet LED (not shown) is mounted on the underside of the first substrate 55 at a position facing the light-transmitting hole of the heat dissipation member 50 described above. As described above, the two first substrates 55 are arranged crossing each other to form a flat V-shape when viewed from the front, so that the top surface of each deep ultraviolet LED faces slightly outward (left and right direction) from below.

Deep UV LEDs are deep UV LEDs that radiate deep UV rays (100-280 nm), which have a short wavelength among UV rays. The wavelength of deep UV rays radiated by these deep UV LEDs is preferably within the range of 200-280 nm.

The deep ultraviolet LEDs are top-illuminating deep ultraviolet LEDs that irradiate from the end face (top face) opposite the first substrate 55 when mounted on the first substrate 55. The beam angle of these deep ultraviolet LEDs is within a range of 120 degrees centered on an axis perpendicular to the top face.

A cooling fan 60 is accommodated in the rear space R2 of the housing 11. The cooling fan 60 is arranged side by side with respect to the first board 55 in a direction along the ceiling wall 13, and is fastened to the holding member 40 by bolts B3. Note that "side by side" refers to an arrangement in which the plate surface of the first board 55 and the cooling fan 60 do not overlap when the deep ultraviolet irradiation device 10 is viewed in a plan view, and includes cases in which the heights in the vertical direction are misaligned. In this embodiment, the cooling fan 60 is arranged slightly above the first board 55.

The cooling fan 60 is configured to suck up air from below and blow it forward, and the air outlet 62, which protrudes forward from the cylindrical main body 61 in the shape of a flattened square tube, is located at a position spaced above the top surfaces of the two first boards 55. With this configuration, the space between the top surface of each first board 55 and the ceiling surface of the housing 11 forms an exhaust path from the air outlet 62 of the cooling fan 60 to the exhaust port 18 of the housing 11.

A portion of the air drawn into the rear space R2 of the housing 11 from the intake port is drawn into the cooling fan 60. It then passes through the cooling fan 60 and is discharged forward from the air outlet 62 of the cooling fan 60, passes through the top surface (exhaust path) of the first board 55, and is exhausted to the outside of the housing 11 from the exhaust port 18. In other words, the first board 55 can be efficiently cooled from the top side by the wind from the cooling fan 60.

In addition, some of the air sucked into the rear space R2 of the housing 11 from the intake port flows forward along the inner wall of the housing 11 (the cover side peripheral wall 16) and into the front space R1, and is exhausted to the outside of the housing 11 from the exhaust port 18.

As shown in FIG. 3, the second board 70 is accommodated in the rear space R2 of the housing 11. The second board 70 is made of an insulating material, is disposed below the cooling fan 60 (on the holding member 40 side), and is fastened to the holding member 40 by bolts B4.

Visible light LEDs 80 are arranged on the left and right sides of the cooling fan 60. The visible light LEDs 80 are mounted on the second board 70 in a form capable of emitting light toward the left and right sides (outside) of the housing 11. Note that a through hole 27 is provided in the portion (side wall 26) of the cover side peripheral wall 16 of the upper cover 12 of the housing 11 that corresponds to the visible light LEDs 80 to allow the light emitted from the visible light LEDs 80 to pass to the outside (see FIG. 1).

Between the second substrate 70 and the holding member 40 (holding plate portion 41), a shielding metal sheet (an example of a substrate shielding portion) 100 is disposed. The shielding metal sheet 100 is made of a conductive material, and as shown in Figs. 3 and 4, includes a main body portion 101 disposed opposite the second substrate 70, side standing walls 102 rising upward from almost the entire left and right side edge portions of the main body portion 101, and a rear standing wall 106 rising upward from the right side portion in the width direction (X direction) of the rear edge portion of the main body portion 101. Note that in Figs. 2 and 3, the shielding metal sheet 100 is darkly shaded to make it easier to distinguish.

A pair of left and right locking pieces 104 are provided at positions near the front and rear ends of each side wall 102, extending upward from the side wall 102. In addition, a front ground connection part 103F is provided in front of the right side wall 102R, rising upward on the inside in the width direction (X direction) of the side wall 102R. Furthermore, a rear ground connection part 103R is provided behind the left side wall 102L, rising upward on the inside in the width direction of the side wall 102L.

The shield metal plate 100 is positioned relative to the holding member 40 by a number of holes 107 provided in the portions corresponding to the bolt fastening portions of the second board 70 and the cooling fan 60 to the holding member 40. In addition, the shield metal plate 100 is engaged with the second board 70 by engaging the locking claws 105 cut and raised on the locking pieces 104 described above with the upper surface of the second board 70.

When the shielding sheet metal 100 and the second substrate 70 are positioned relative to the holding member 40, the front ground connection portion 103F and the rear ground connection portion 103R of the shielding sheet metal 100 described above are passed through the connection hole 71 provided in the second substrate 70 and are solder-connected to a discharge circuit (not shown) formed on the second substrate 70 (see FIG. 3).

In this way, the shielding metal sheet 100 is superimposed on the second substrate 70 so as to cover the underside 70B of the second substrate 70 (an example of the surface opposite the substrate side), thereby suppressing electromagnetic waves that affect the second substrate 70 and the mounted components from the underside 70B side of the second substrate 70.

As shown in FIG. 3, at the rear end of the top surface (an example of the surface facing the substrate) 70A of the second substrate 70, a connector jack (an example of a connector portion) 75, a remote control jack 76, and a slide switch timer 77 are arranged side by side from the left side. The rear ends of the remote control jack 76 and the slide switch timer 77 extend rearward from the second substrate 70.

The rear wall 106 of the shield sheet metal 100 described above rises in a portion corresponding to the remote control jack 76 and the slide switch timer 77, and has an opening 108 for passing through the remote control jack 76 and the slide switch timer 77. The connector jack opening 22, the remote control jack opening 23, and the slide switch timer opening 24 provided in the rear wall 21 of the upper cover 12 described above are provided at positions corresponding to these.

The connector jack 75 is box-shaped with an open rear surface and is fixed to the upper surface 70A of the second board 70 by a fixing means such as an adhesive. The connector jack 75 is a part that inserts a vehicle-side connector (not shown) provided at the end of the wiring for power supply, ignition signal, and ground connection drawn from the vehicle's instrument panel from the rear to the front, that is, in a direction along the plate surface of the second board 70, and establishes electrical continuity with the circuit on the second board 70. When the vehicle-side connector is fitted into the connector jack 75, the wiring for power supply, ignition signal, and ground connection is arranged along the plate surface of the second board 70.

The above-mentioned shielding sheet metal 100 extends to a range where it overlaps the connector jack 75 in a plan view. In other words, the area of the shielding sheet metal 100 that overlaps the connector jack 75 (the area surrounded by a dotted line in FIG. 4, hereinafter referred to as the connector overlapping portion (one example of a conductive plate portion) 109) suppresses electromagnetic waves that affect the signal transmitted from the vehicle within the connector jack 75 from the underside 70B side of the second board 70. In addition, this connector overlapping portion 109 forms a pseudo capacitor between the wiring (signal line) extending from the vehicle within the connector jack 75, thereby reducing noise in the signal transmitted from the vehicle.

The deep ultraviolet irradiation device 10 of the present embodiment described above can be used, for example, for the purpose of sterilizing the passenger compartment (one example of an interior space) of a vehicle such as a taxi. When the deep ultraviolet irradiation device 10 of the present embodiment is attached to the ceiling of the passenger compartment (rear seat) of a vehicle such as a taxi, the two deep ultraviolet LEDs are tilted outward from the horizontal direction, so that sterilization can be performed by irradiating up to a high position on the side of the vehicle. Such irradiation of deep ultraviolet rays can be performed, for example, in a hangar after operation, or during waiting time for passengers or during return time if a separator with a deep ultraviolet cut film is provided between the front and rear seats.

Next, the effects will be described. The deep ultraviolet irradiation device 10 of this embodiment includes a second substrate 70 arranged along the mounting surface of the vehicle, and a connector jack 75 to which the vehicle ignition signal (occupant detection signal) is input via a signal line from a direction along the plate surface of the second substrate 70. A conductive plate-shaped connector overlapping portion 109 is overlapped and arranged on the lower surface (an example of the opposite surface) 75B side of the connector jack 75 opposite to the upper surface (an example of the opposite surface) 75A facing the mounting surface.

According to the above configuration, the electromagnetic waves that affect the signal line (wiring) arranged inside the connector jack 75 from the underside 75B side of the connector jack 75 can be suppressed by the connector overlapping portion 109 of the shielding sheet metal 100. Moreover, since a pseudo-capacitor is formed between the signal line arranged inside the connector jack 75 and the connector overlapping portion 109, this pseudo-capacitor reduces noise in the ignition signal, and a highly accurate ignition signal can be input to the deep ultraviolet ray irradiation device 10.

The second substrate 70 is provided with a conductive shielding sheet metal 100 that covers the lower surface 70B opposite to the upper surface 70A that faces the mounting surface of the vehicle, and the shielding sheet metal 100 is configured (integrally) to include the connector overlapping portion 109.

According to the above configuration, electromagnetic waves affecting the second substrate 70 from the underside 70B side of the second substrate 70 can be suppressed by the conductive shielding metal sheet 100. In addition, since the shielding metal sheet 100 is configured integrally with the connector overlapping portion 109, the number of parts can be reduced and the configuration can be simplified compared to a configuration in which the connector overlapping portion 109 is a separate part.

<Embodiment 2>
Next, a second embodiment will be described with reference to Fig. 7. In the following, only configurations different from the first embodiment will be described, and the same components as those in the first embodiment will be given the same reference numerals, and duplicated descriptions will be omitted.

In the above-mentioned embodiment 1, the connector overlapping portion 109 of the conductive shielding metal plate 100 is overlapped on the underside 75B of the connector jack 75. However, the deep ultraviolet ray irradiation device of this embodiment differs from the above-mentioned embodiment 1 in that the shielding metal plate 110 is configured to surround the periphery of the connector jack 75.

Specifically, the shield metal sheet 110 is raised from the left end of the connector overlapping portion 119 toward the second board 170, and is inserted into a slit (an example of an insertion hole) 178 provided in the second board 170 along the left end of the connector jack 75. The conductive extension portion 111 is bent along the outer surface of the connector jack 75 so as to cover the left side surface 75C, the top surface 75A, and the right side surface (not shown) of the connector jack 75. The portion of the conductive extension portion 111 that is inserted into the slit 178 is soldered to a discharge circuit (not shown) provided on the second board 170.

According to the above configuration, a portion of the shielding metal sheet 110 surrounds the connector jack 75, increasing the capacitance of the pseudo-capacitor formed between the connector overlapping portion 119 and the conductive extension portion 111 of the shielding metal sheet 110 and the signal line (wiring) arranged inside the connector jack 75, thereby further reducing noise in the ignition signal input to the ultraviolet irradiation device.

Furthermore, with the above configuration, the conductive extension portion 111 can be used to form a discharge path for the ultraviolet irradiation device.

<Other embodiments>
The technology disclosed in this specification is not limited to the embodiments described above and illustrated in the drawings, and for example, the following embodiments are also included within the technical scope.

(1) In the above embodiment, the connector jack 75 is disposed on the upper surface 70A of the second substrate 70, and the shield metal plate 100 (connector overlapping portion 109) is overlapped below the second substrate 70. However, the connector portion may be disposed in line with the substrate. In that case, the conductive plate portion may be provided separately from the substrate shield portion.

(2) In the above embodiment, the deep ultraviolet ray irradiation device 10 is configured to be operated based on the vehicle ignition signal, but the types of occupant detection signals, such as door lock signals, other than the ignition signal, are not limited to those in the above embodiment.

(3) In the above embodiment, a configuration is shown in which the shielding metal plate 100, 110 is provided to cover the entire underside of the second substrate 70, 170, but a configuration in which the underside of the substrate is not covered by a substrate shield portion is also included in the technical scope. In short, it is sufficient that the opposing surface of the connector portion is covered by a conductive plate portion.

(4) In the above-mentioned embodiment 2, the conductive extension portion 111 is used to establish a conductive connection between the shield metal plate 110 and the discharge circuit of the second substrate 170. However, instead of using the conductive extension portion 111, a separate ground connection portion may be provided as in embodiment 1.

(5) In the above embodiment 2, the conductive extension portion 111 extends integrally from the shield metal plate 110 (connector overlap portion 119). However, as shown in FIG. 8, the periphery (side and top surface) of the connector portion can also be surrounded by a separate conductive plate portion 120.

10: Deep ultraviolet irradiation device (ultraviolet irradiation device), 11: Housing, 70, 170: Second board (board), 70A: Top surface (opposite surface to board), 70B: Bottom surface (opposite surface to board), 75: Connector jack (connector part), 75A: Top surface (opposite surface), 75B: Bottom surface (opposite surface), 100, 110: Shielding sheet metal (board shielding part), 109, 119: Connector overlapping part (conductive plate part), 111: Conductive extension part, 178: Slit (insertion hole)

Claims (4)

An ultraviolet irradiation device that is attached to a mounting surface in a vehicle interior and irradiates ultraviolet rays toward the interior of the vehicle,
A substrate disposed along the mounting surface;
a connector portion to which a vehicle occupant detection signal is input via a signal line from a direction along a plate surface of the board,
The ultraviolet irradiation device has a conductive plate portion, which is a plate-like conductive plate portion having electrical conductivity, superimposed on the opposite surface of the connector portion opposite the opposing surface that faces the mounting surface. the connector portion is disposed on a board-side facing surface of the board that faces the mounting surface,
The ultraviolet irradiation device of claim 1, wherein the conductive plate portion is arranged on the substrate-side opposite surface opposite the substrate-side facing surface, rises toward the substrate, is inserted into an insertion hole provided in the substrate, and has a conductive extension portion covering the periphery of the connector portion. The ultraviolet irradiation device according to claim 2, wherein the conductive extension is conductively connected to a discharge circuit provided on the substrate. The ultraviolet irradiation device according to any one of claims 1 to 3, further comprising a conductive board shield part covering the board-side opposite surface of the board opposite the board-side facing surface that faces the mounting surface, and the conductive plate part is integrally connected to the board shield part.

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