Light irradiation apparatus

Abstract

To provide a light irradiation apparatus capable of widening an irradiation range in a direction along an exhaust path.SOLUTION: A light irradiation apparatus 10 includes: a substrate 40 having a first surface 40U disposed so as to face a fitting surface 2 in a vehicle room and a second surface 40L of an opposite side to the first surface 40U, and mounted with an irradiation element 45 on the second surface 40L; cooling fans 50 disposed in a state of lining up side by side in a direction along the fitting surface 2 to the substrate 40; and a housing 11 having a suction port and an exhaust port 15, and for housing the substrate 40 and the cooling fan 50, wherein the first surface 40U constitutes a part of an air passage 17 from an air blow port 52 to the exhaust port 15 of the cooling fan 50, and the substrate 40 is rotatable around a shaft 46 extending in a direction intersecting the air passage 17 and a direction along a plate surface of the substrate 40, and provided at a position overlapping the irradiation element 45.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The technology disclosed in this specification relates to a light irradiation device. [Background technology]

[0002] Conventionally, a light irradiation device for vehicle installation having a function of irradiating light is known, for example, as described in Patent Document 1. This device includes a board on which an irradiation element is mounted, a cooling fan, and a housing having an intake port and an exhaust port and accommodating the board and the cooling fan. The board and the cooling fan are accommodated in the housing in a state of being arranged side by side along the mounting surface in the vehicle cabin, and the back surface of the board (the surface opposite to the surface on which the irradiation element is arranged) constitutes a part of the exhaust path from the cooling fan to the exhaust port. This configuration allows for a thin structure and enables the board to be efficiently cooled.

[0003] This light irradiation device also has multiple substrates that are arranged in a direction that intersects with the exhaust passage and are arranged so that their plate surfaces intersect with each other. With this configuration, the irradiation elements mounted on each substrate are irradiated in different directions, making it possible to expand the irradiation range. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2022-119199 A Summary of the Invention [Problem to be solved by the invention]

[0005] As described above, the above-described light irradiation device can widen the irradiation range in the direction intersecting the exhaust path, but there is also a demand to widen the irradiation range also in the direction along the exhaust path.

[0006] The technology disclosed in this specification has been developed in consideration of the above circumstances, and aims to provide a light irradiation device that can expand the irradiation range in the direction along the air flow path (exhaust path). [Means for solving the problem]

[0007] The technology disclosed in this specification, which has been completed to solve the above-mentioned problems, is a light irradiation device to be attached to a mounting surface inside a vehicle cabin, the light irradiation device comprising: a substrate having a first surface facing the mounting surface and a second surface opposite the first surface, with an irradiation element mounted on the second surface; a cooling fan arranged side-by-side on the substrate in a direction along the mounting surface; and a housing having an air intake and an exhaust port and accommodating the substrate and the cooling fan, the first surface of the substrate forming part of an air flow path from the air outlet of the cooling fan to the exhaust port, and the substrate extending in a direction intersecting the air flow path and along a plate surface of the substrate and being rotatable around an axis provided at a position overlapping with the irradiation element.

[0008] According to the above configuration, by rotating the substrate, the direction in which the second surface of the substrate is oriented changes, and therefore the irradiation range of the light emitted from the irradiation element mounted on the second surface of the substrate can be expanded in the direction along the air flow path.

[0009] The housing has a first opposing surface facing the first surface of the board, and the first opposing surface has an inclined portion that slopes from the air outlet of the cooling fan toward the exhaust port of the housing toward the board, and the board may be capable of rotating by the force of air blown out of the air outlet of the cooling fan and blown onto the board by the inclined portion.

[0010] According to the above-mentioned configuration, the force of the air blown out from the cooling fan can be used to rotate the substrate, which means that a drive device for directly rotating the substrate is not required, and the light irradiation device can be simplified.

[0011] One end of the substrate sandwiching the shaft may be heavier than the other end, and air blown out from the air outlet of the cooling fan may be blown toward the other end.

[0012] According to the above configuration, when the cooling fan is not blowing air or the force of the blown air is weak, the relatively heavy one end of the board is lowered by gravity. On the other hand, when the force of the blown air is strong, the board rotates due to the force of the air blown toward the other end, and the other end is lowered. In this way, the board can be rotated by adjusting the wind force of the cooling fan.

[0013] The one end of the substrate, which is positioned on the cooling fan side across the shaft, may be provided with a rib that rises toward the first surface side of the substrate, so that the one end is heavier than the other end.

[0014] According to the above configuration, the ribs on the board not only increase the weight of one end of the board, but also prevent foreign matter such as dust and dirt contained in the air blown out from the cooling fan from entering the cooling fan side inside the housing.

[0015] The housing may have a second opposing surface that faces the second surface of the board, and a rotation range of the board may be restricted by the second opposing surface.

[0016] The shaft may be supported by a support wall provided in the housing, and the substrate may be positioned in the extension direction of the shaft by the support wall.

[0017] According to the above-mentioned configuration, the support wall can serve both to support the shaft and to position the substrate, so that the configuration of the light irradiation device can be simplified.

[0018] The first and second irradiation elements may be mounted on the substrate, and a first portion of the substrate mounting the first irradiation element and a second portion of the substrate mounting the second irradiation element may be aligned in a direction intersecting the air flow path and extend in directions intersecting each other.

[0019] According to the above configuration, the irradiation range can be expanded not only in the direction along the air flow path, but also in the direction intersecting the air flow path. Effect of the Invention

[0020] According to the technique disclosed in this specification, it is possible to provide a light irradiation device capable of expanding the irradiation range in the direction along the air flow path. [Brief description of the drawings]

[0021] [Figure 1] FIG. 1 is a schematic diagram showing an irradiation range in the front-rear direction of a vehicle when the deep ultraviolet irradiation device of the first embodiment is attached to the vehicle. [Diagram 2] A schematic diagram showing the irradiation range in the vehicle width direction when the deep ultraviolet irradiation device is attached to the vehicle. [Diagram 3] A perspective view of the deep ultraviolet irradiation device from the top side. [Figure 4] A perspective view of the deep ultraviolet irradiation device from the bottom side [Diagram 5] Partially exploded plan view of deep ultraviolet irradiation device [Figure 6] Section II of Figure 5 [Figure 7] Cross-sectional view of FIG. 5 along the line II-II [Figure 8] Partially exploded plan view of a deep ultraviolet irradiation device according to a second embodiment [Figure 9] III-III sectional view of Figure 8 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] <Embodiment 1> A first embodiment in which the light irradiation device disclosed in this specification is applied to a deep ultraviolet irradiation device 10 capable of sterilizing the interior of a vehicle will be described with reference to Figs. 1 to 7. 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. In the following description, the X-axis direction is the left direction or width direction, the Y-axis direction is the forward direction, and the Z-axis direction is 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.

[0023] 1 and 2, the deep ultraviolet ray irradiation device 10 of this embodiment can be used for the purpose of sterilizing the passenger compartment of a vehicle (an example of a vehicle) 1 such as a taxi. This deep ultraviolet ray irradiation device 10 can be used in a state where it is attached to a ceiling surface (an example of an attachment surface) 2 of the passenger compartment (rear seat) of the vehicle 1.

[0024] The deep ultraviolet irradiation device 10 is configured to include an LED board (an example of a board) 40 on which LEDs (an example of an irradiation element) 45 are mounted, a cooling fan 50 for cooling the LED board 40, and a housing 11 that accommodates the LED board 40 and the cooling fan 50 therein.

[0025] 3 and 4, the housing 11 has a flat box shape as a whole, and is composed of a substantially rectangular holding member 30 and two covers 12, 20 that cover the front and back (top and bottom) of the holding member 30. The holding member 30 has a substantially rectangular plate-like holding plate portion 31 and a frame-like frame portion 32 that rises up and down from the peripheral portion of the holding plate portion 31, the upper cover 12 has a shallow dish shape as a whole that covers the top surface of the holding plate portion 31 and is fitted inside the frame portion 32, and the lower cover 20 has a plate shape that covers the bottom surface of the holding plate portion 31 and is fitted inside the frame portion 32.

[0026] The upper cover 12 includes a ceiling wall 13 disposed opposite the upper surface of the holding plate portion 31, and a peripheral cover wall 14 that extends downward from the peripheral edge of the ceiling wall 13 while expanding in diameter outward (see FIGS. 3 and 6).

[0027] The ceiling wall 13 is composed of a front ceiling wall (an example of a first opposing surface) 13F that is inclined rearward and upward from its front end and covers approximately 1 / 3 of the front portion of the holding plate 31, and a rear ceiling wall 13R that is connected to the front ceiling wall 13F and covers approximately 2 / 3 of the rear portion of the holding plate 31 in a state parallel to the holding plate 31. The inclination angle of the front ceiling wall 13F is set at an angle of approximately 15 degrees with respect to the holding plate 31.

[0028] A front wall 14F of the cover peripheral wall 14, which is continuous with the front end of the front ceiling wall 13F, is provided with a plurality of slit-shaped exhaust ports 15 extending vertically across the front ceiling wall 13F. Also, a rear wall of the cover peripheral wall 14, which is continuous with the rear end of the rear ceiling wall 13R, is provided with a plurality of slit-shaped intake ports (not shown).

[0029] The upper cover 12 is fixed to the holding member 30 by fastening bolts B to a plurality of cylindrical upper cover fastening portions 36 rising from the holding plate portion 31 of the holding member 30 (see Figs. 3 and 5). When the upper cover 12 is fixed to the holding member 30, a space is formed between the upper cover 12 and the holding plate portion 31. Hereinafter, within the internal space of this housing 11, the space below the front ceiling wall 13F is referred to as a front space R1, and the space below the rear ceiling wall 13R is referred to as a rear space R2 (see Fig. 6).

[0030] 6, a partition wall 33 that roughly separates the front space R1 and the rear space R2 rises up toward the upper cover 12 on the holding plate 31. That is, the partition wall 33 is provided on the holding plate 31 at the boundary between the front ceiling wall 13F and the rear ceiling wall 13R or in a position close to the boundary.

[0031] On the other hand, the lower cover 20 of the housing 11 is in the form of a substantially rectangular plate, and is slightly curved overall so that the central portion bulges slightly downward. The lower cover 20 is fixed to the holding member 30 by engaging the locking portions 22 provided at the center of each of the four sides (edge ​​portions) with the locking holes 37 provided in the holding plate portion 31 of the holding member 30 described above (see FIG. 5).

[0032] A housing-side opening 21 is provided in a portion of the lower cover 20 that faces the front ceiling wall 13F of the upper cover 12 (a portion of the portion that corresponds to the front space R1) that is elongated in the width direction (left-right direction) and penetrates the plate surface (see Figs. 6 and 7). This housing-side opening 21 is closed by a cover portion (an example of a housing, a second opposing surface) 25 made of aluminum or an aluminum alloy. A holding member-side opening 35 is provided in a position of the holding plate portion 31 that faces the housing-side opening 21 and penetrates the plate surface. The housing-side opening 21 and the holding member-side opening 35 are in communication (see Figs. 6 and 7).

[0033] The above-mentioned partition 33 rises from the holding plate 31 along the rear opening edge of the holding member side opening 35. The partition 33 is provided at the center in the width direction of the holding plate 31, and the space on the sides of the partition 33 is open in the front-rear direction. In addition, a flange 34 that protrudes forward in a flange shape is provided at the upper end of the partition 33 (see FIG. 6).

[0034] The LED board 40 is disposed above the housing side opening 21 and the holding member side opening 35, which are in communication with each other. That is, the LED board 40 is disposed above the lid portion 25 that closes the housing side opening 21. The specific configuration of the LED board 40 will be described later.

[0035] A cooling fan 50 is accommodated in the rear space R2 of the housing 11. The cooling fan 50 is fastened to the holding member 30 by a bolt B in a state where it is arranged side by side with respect to the LED board 40 in a direction along the ceiling wall 13 (see FIG. 5). Note that "side by side" refers to an arrangement in which the plate surface of the LED board 40 and the cooling fan 50 do not overlap when the deep ultraviolet irradiation device 10 is viewed in a plan view, and includes a case where the heights in the vertical direction are misaligned. In this embodiment, the cooling fan 50 is arranged slightly above the LED board 40 (see FIG. 6).

[0036] The cooling fan 50 has a fan body 51 that is generally flat and cylindrical. The fan body 51 is disposed in the rear space R2 of the housing 11 so that a pair of bottom surfaces face up and down. The cooling fan 50 is configured to suck air from below and blow it forward, and has an air outlet 52 that protrudes forward in the shape of a flattened square tube. The cooling fan 50 is disposed close to the rear ceiling wall 13R, and the air outlet 52 protrudes forward from the fan body 51.

[0037] The air outlet 52 is disposed on the upper surface of the flange portion 34 of the partition wall 33, the tip of which rises from the holding plate portion 31 (see FIG. 6). The air outlet 52 is disposed at a position spaced upward from the upper surface (an example of a first surface) 40U of the LED board 40. With this configuration, the space between the upper surface 40U of the LED board 40 and the front ceiling wall 13F of the housing 11 is used as an exhaust path (an example of an air flow path) 17 from the air outlet 52 of the cooling fan 50 to the exhaust port 15 of the housing 11.

[0038] In addition, near the rear of the above-mentioned front ceiling wall 13F, a recessed portion (one example of an inclined portion) 16 extends in the width direction from the rear to the front, recessed obliquely downward at an inclination angle larger than the inclination angle of the front ceiling wall 13F, and guides the air blown out from the air outlet 52 of the cooling fan 50 and blows it toward the upper surface 40U of the LED board 40. In this embodiment, the inclination angle of the recessed portion 16 is set to an angle of about 35 degrees with respect to the holding plate portion 31.

[0039] Next, the LED substrate 40 will be described in detail. The LED substrate 40 is made of aluminum or an aluminum alloy, and has a generally rectangular plate shape in plan view as shown in Fig. 5. Hereinafter, the LED substrate 40 will be described with the direction along the longitudinal direction of the LED substrate 40 (X direction) as the length direction, and the direction along the short side direction (Y direction) as the width direction. The LED substrate 40 is left-right line symmetrical in the longitudinal direction.

[0040] In plan view, the LED board 40 has two corners arranged on the front end side cut out in an L-shape to form cutout portions 41. These cutout portions 41 are for allowing the above-mentioned upper cover fastened portion 36 to escape when the LED board 40 is installed inside the housing 11. In addition, a rib 42 rising upward is provided over the entire rear end portion of the LED board 40 at the rear end portion (an example of one end) (see Figs. 5 to 7).

[0041] Two LEDs (examples of first and second illumination elements) 45 are mounted on the underside (an example of the second surface) 40L of the LED substrate 40, aligned along the length direction (X direction) of the LED substrate 40, at the center of the width direction (Y direction) of the LED substrate 40 (see Figures 5 to 7).

[0042] The LED 45 of this embodiment is a deep ultraviolet LED 45 that irradiates deep ultraviolet rays (100 to 280 nm) that have a short wavelength among ultraviolet rays. The wavelength of the deep ultraviolet rays irradiated by these LEDs 45 is preferably within a range of 200 to 280 nm. In addition, the LED substrate 40 may be equipped with a visible light LED that emits visible light together with the deep ultraviolet LED 45.

[0043] The LEDs 45 of this embodiment are top-illuminated LEDs that, when mounted on the LED substrate 40, emit light from the end face (top face) opposite the LED substrate 40. The beam angle of these LEDs 45 is within a range of 120 degrees centered on an axis perpendicular to the top face.

[0044] As shown in FIG. 7, the lower surface 40L of the LED substrate 40 on which the LEDs 45 are mounted (an example of the first and second portions) is an inclined portion 43 inclined outward in the width direction (X direction, length direction of the LED substrate 40) of the housing 11. In this embodiment, the inclined portion 43 is provided over the entire width direction (Y direction) of the LED substrate 40. That is, the LED substrate 40 is bent in a mountain fold and a valley fold at a plurality of points along the width direction to form the inclined portion 43. In this embodiment, the inclination angle is set so that the angle formed by the two inclined portions 43 is 120 degrees. The two LEDs 45 are mounted on the lower surface of the inclined portion 43 (the lower surface 40L of the LED substrate 40), so that the top surface of each LED 45 faces slightly outward (left and right direction) from below.

[0045] Furthermore, the LED substrate 40 of this embodiment is provided with two rotation shafts (one example of a shaft) 46 extending in the length direction at both ends in the length direction and at approximately the center in the width direction (see Figs. 5 and 7). The two rotation shafts 46 are arranged coaxially. The above-mentioned two LEDs 45 are also arranged coaxially with these rotation shafts 46. Note that with respect to the LEDs 45, being coaxial with the rotation shaft 46 does not only mean that the LEDs 45 are completely aligned with the rotation shaft 46, but also includes that the LEDs 45 are arranged at positions overlapping the rotation shafts 46 on the front and back of the LED substrate 40, for example.

[0046] The rotating shaft 46 is in the shape of a round bar, and is positioned in the width direction of the LED board 40 by being fitted into a groove having an arc-shaped cross section provided on the lower surface 40L of the LED board 40. A large-diameter portion 47 that protrudes radially from the rotating shaft 46 is provided at the inner end (the center side in the length direction) of the rotating shaft 46 in the extension direction, and this large-diameter portion 47 is engaged with a step portion 44 provided on the lower surface of the LED board 40 (see FIG. 7). Furthermore, an outer end (the end opposite to the large-diameter portion 47) that protrudes outward in the extension direction of the rotating shaft 46 is rotatably supported by a support wall 38 that rises from the plate surface of the holding plate portion 31, whereby the rotating shaft 46 is positioned in the length direction of the LED board 40, and the LED board 40 is rotatably attached to the holding member 30, and is thus held in a rotatable state within the housing 11.

[0047] In addition, in the above-mentioned lid portion 25, a light-transmitting hole 26 for exposing the LED 45 to the outside is provided at a position facing the LED 45 when the LED board 40 is installed in the housing 11. The light emitted from the LED 45 is irradiated to the outside of the housing 11 through these light-transmitting holes 26. More specifically, as shown in Figs. 4, 6 and 7, the lid portion 25 has two recessed portions connected together, each recessed in a mortar shape toward the top, and the light-transmitting hole 26 is provided in the center of each recessed portion, i.e., the most recessed portion as viewed from the inside of the room, and the LED 45 is exposed from these light-transmitting holes 26. The inner diameter of the light-transmitting hole 26 is set to a dimension slightly larger than the outer diameter of the LED 45.

[0048] In the deep ultraviolet irradiation device 10 attached to the ceiling surface 2 of the vehicle 1, in the initial state in which the power is turned off, the rear end of the LED substrate 40 is lowered and the front end is raised due to the weight of the rib 42, and the LED substrate 40 is arranged in an inclined manner in the front-rear direction (Y direction) (see the dashed line in FIG. 6). In this initial state, the lower surface 40L of the LED substrate 40 is arranged on the rear side of the bowl-shaped wall portion of the lid portion 25 and is superimposed on the upper surface of the rear wall 27 that is arranged on the rear side and inclined forward and upward, and thus further downward rotation of the rear end side is restricted.

[0049] In this state, the power is turned on to start irradiating the LED 45. At this time, the top of the LED 45 is tilted diagonally forward from directly below in the fore-and-aft direction due to the LED substrate 40 that is inclined in the fore-and-aft direction, so that it is possible to irradiate a wider range in the front part of the vehicle 1 compared to a state in which the LED 45 faces directly below in the fore-and-aft direction.

[0050] When the power is turned on, the LEDs 45 start emitting light and the cooling fan 50 starts operating, so that air drawn into the rear space R2 of the housing 11 from the air intake passes through the fan main body 51 and is blown out forward from the air outlet 52. The blown out air is blown along the lower surface of the recessed portion 16 onto the upper surface 40U of the LED substrate 40.

[0051] By keeping the airflow of the cooling fan 50 weak for a while after the power is turned on so that the LED board 40 does not rotate from the initial state, the air blown out from the cooling fan 50 can cool the LED board 40 without affecting the inclination of the LED board 40. The air blown out from the cooling fan 50 passes through the upper surface 40U (exhaust path 17) of the LED board 40 arranged at an angle, and is exhausted from the exhaust port 18 to the outside of the housing 11.

[0052] Then, after a predetermined time has elapsed, the airflow rate of the cooling fan 50 is increased. Then, the front end side of the LED board 40 is pushed by the force of the air blown out from the cooling fan 50, and rotates forward and downward about the rotation axis 46 (see the solid line in FIG. 6). Then, the lower surface 40L of the LED board 40 is superimposed on the upper surface of the front wall 28, which is disposed on the front side of the bowl-shaped wall portion of the lid portion 25 and inclined forward and downward, and thus further downward rotation is restricted.

[0053] In this state, the rib 42 provided at the rear end of the LED board 40 is set to abut from below against the flange portion 34 of the partition wall 33. As a result, a part of the gap of the exhaust passage 17 is blocked, and the air blown out from the cooling fan 50 can be efficiently exhausted to the outside of the housing 11.

[0054] In this state, the top of the LED 45 is tilted diagonally rearward from directly below the housing 11 in the fore-and-aft direction, so that a wider area of ​​the rear portion of the vehicle 1 can be illuminated compared to when the LED 45 faces directly downward in the fore-and-aft direction.

[0055] The air blown out from the cooling fan 50 collides with the inner wall surface (lower surface) of the recessed portion 16 and is guided toward the LED board 40. The recessed portion 16 is configured so that the air can be blown most strongly toward a position slightly forward of the portion of the upper surface 40U of the LED board 40 on which the LEDs 45 are mounted, which is the portion most likely to become hot.

[0056] Next, the effects will be described. The deep ultraviolet irradiation device 10 of this embodiment is attached to the ceiling surface 2 of the vehicle 1, and has an upper surface 40U arranged opposite to the ceiling surface 2 and a lower surface 40L opposite to the upper surface 40U, and includes an LED board 40 on which an LED 45 is mounted, a cooling fan 50 arranged in a state of being arranged side by side in a direction along the ceiling surface 2 with respect to the LED board 40, and a housing 11 having an intake port and an exhaust port 15 and accommodating the LED board 40 and the cooling fan 50, and the upper surface 40U of the LED board 40 constitutes a part of the exhaust path 17 from the blower port 52 of the cooling fan 50 to the exhaust port 15, and the LED board 40 extends in a direction intersecting with the exhaust path 17 and in a direction along the plate surface of the LED board 40, and is rotatable around a rotation axis 46 provided at a position overlapping the LED 45.

[0057] According to the above configuration, by rotating the LED substrate 40, the direction in which the lower surface 40L of the LED substrate 40 is oriented changes, and therefore the irradiation range of the light emitted from the LEDs 45 mounted on the lower surface 40L of the LED substrate 40 can be expanded in the direction along the exhaust path 17 (Y direction).

[0058] In addition, the housing 11 has a front ceiling wall 13F facing the upper surface 40U of the LED board 40, and the front ceiling wall 13F has a recessed portion 16 that slopes in a direction approaching the LED board 40 from the air outlet 52 of the cooling fan 50 toward the exhaust outlet 15 of the housing 11, and the LED board 40 is capable of rotating by the force of air blown out from the air outlet 52 of the cooling fan 50 and blown onto the LED board 40 by the recessed portion 16.

[0059] According to the above configuration, the LED substrate 40 can be rotated by utilizing the force of the air blown out from the cooling fan 50. That is, a drive device for directly rotating the LED substrate 40 is not required, and the deep ultraviolet ray irradiation device 10 can be simplified.

[0060] In addition, one end (rear end) of the LED board 40 sandwiching the pivot shaft 46 is configured to be heavier than the other end (front end), so that the air blown out from the air outlet 52 of the cooling fan 50 is blown toward the front end.

[0061] According to the above configuration, when air is not blown out from the cooling fan 50 or when the force of the blown air is weak, the relatively heavy rear end side of the LED board 40 is lowered by gravity. On the other hand, when the force of the blown air is strong, the LED board 40 rotates due to the force of the air blown toward the front end side, and the front end side is lowered. In this way, the LED board 40 can be rotated by adjusting the wind force of the cooling fan 50.

[0062] A rib 42 rising from the upper surface 40U of the LED substrate 40 is provided at the rear end side of the LED substrate 40, which is positioned on the cooling fan 50 side across the pivot shaft 46, making the rear end side heavier than the front end side.

[0063] According to the above configuration, the rib 42 provided on the LED board 40 not only increases the weight of the rear end side of the LED board 40, but also prevents foreign matter such as dust and dirt contained in the air blown out from the cooling fan 50 from entering the cooling fan 50 side inside the housing 11.

[0064] In addition, the housing 11 has a lid portion 25 that faces the lower surface 40L of the LED board 40, and the lid portion 25 restricts the rotation range of the LED board 40.

[0065] Furthermore, the pivot shaft 46 is supported by a support wall 38 provided on the holding member 30, and the LED board 40 is positioned by the support wall 38 in the extension direction of the pivot shaft 46 (the length direction of the LED board 40).

[0066] According to the above configuration, the support wall 38 can serve both to support the rotation shaft 46 and to position the LED substrate 40, so that the configuration of the deep ultraviolet ray irradiation device 10 can be simplified.

[0067] Furthermore, two LEDs 45 are mounted on the LED substrate 40, and one inclined portion 43 of the LED substrate 40 on which each LED 45 is mounted and the other inclined portion 43 are aligned in a direction intersecting the extension direction of the exhaust path 17 (X direction) and extend in directions intersecting each other.

[0068] According to the above configuration, the irradiation range can be expanded not only in the direction along exhaust path 17 but also in the direction intersecting exhaust path 17 .

[0069] <Embodiment 2> Next, a second embodiment will be described with reference to Figures 8 and 9. In the following, only configurations different from the first embodiment will be described, and the same configurations as those in the first embodiment will be given the same reference numerals, and duplicated explanations will be omitted.

[0070] The deep ultraviolet irradiation device 100 of this embodiment is different from the above-mentioned embodiment 1 in that the LED substrate is divided into two and the LED substrate itself is arranged to be inclined in the width direction of the housing 11. Specifically, the two LED substrates 60 are each made to have a flat plate shape, and are attached side by side in the left-right direction in a state where they cross each other so as to form a flat V-shape when viewed from the front, as shown in Fig. 9. The two LED substrates 60 are made symmetrical to each other.

[0071] Furthermore, the rotation shafts 66 of the LED substrates 60 of this embodiment are installed in the housing 11 with the rotation shafts 66 themselves tilted so as to follow the plate surfaces of the LED substrates 60. That is, the two rotation shafts 66 are arranged coaxially in a plan view, but extend in directions intersecting each other so as to form a flattened V-shape in a front view.

[0072] In the deep ultraviolet irradiation device 100 of this embodiment, as in the above embodiment, the LED substrate 60 can be rotated using air blown out from the cooling fan 50, thereby expanding the irradiation range of the light emitted from the LEDs 65 mounted on the lower surface 60L of the LED substrate 60 in both the direction along the exhaust path 17 (Y direction) and the direction intersecting the exhaust path 17 (X direction).

[0073] <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.

[0074] (1) In the above embodiment, the LED boards 40, 60 are rotated by utilizing the force of the air blown out from the cooling fan 50. However, a drive device that directly drives and rotates the LED boards may be provided.

[0075] (2) In the above embodiment, the ribs 42, 62 are provided on the rear end side of the LED boards 40, 60, making the rear end side heavier than the front end side, but the front end side of the LED board may be configured to be heavier. In such a case, the LED board can be rotated by configuring the air blown out from the cooling fan to be strongly blown against the front end side of the LED board.

[0076] (3) The rotation of the LED boards 40 and 60 may be prevented by a member other than the lid portion 25 .

[0077] (4) In the above embodiment, the deep ultraviolet ray irradiation devices 10, 100 have the two LEDs 45, 65. However, the number of LEDs is not limited to two, and may be one or three or more.

[0078] (5) In the above embodiment, the LEDs 45, 65 are mounted on portions of the LED substrates 40, 60 facing outward in the width direction, thereby enabling the LEDs 45, 65 to illuminate a wide range in the width direction. However, the LED substrates may also be configured not to face outward in the width direction.

[0079] (6) In the above embodiment, the deep ultraviolet irradiation devices 10 and 100 were shown as an example of a light irradiation device, but the technology disclosed in this specification can also be applied to devices that irradiate light other than deep ultraviolet light, such as visible light.

[0080] (7) The light irradiation device can be installed not only on the ceiling of the vehicle but also on the side wall or floor. Also, the light irradiation device can be installed in any position, not only on the vehicle but also on a train, airplane, ship, or other vehicle, or inside a building. [Explanation of symbols]

[0081] 1: vehicle (vehicle) 2: ceiling surface (mounting surface) 10, 100: deep ultraviolet irradiation device (light irradiation device) 11: housing 13F: front ceiling wall (first opposing surface) 15: exhaust port 16: recess (inclined portion) 17: exhaust path (air flow path) 18: exhaust port 25: lid (housing, second opposing surface) 38: support wall 40, 60: LED board (board) 40L, 60L: bottom surface (second surface) 40U, 60U: top surface (first surface) 42, 62: rib 45, 65: LED (irradiation element) 46, 66: rotating shaft (shaft) 50: cooling fan 52: air outlet

Claims

1. A light irradiation device that is attached to a mounting surface inside a vehicle cabin, a substrate having a first surface disposed opposite to the mounting surface and a second surface opposite to the first surface, the second surface being provided with an illumination element mounted thereon; cooling fans arranged side by side in a direction along the mounting surface of the board; a housing having an intake port and an exhaust port and accommodating the board and the cooling fan; the first surface of the substrate constitutes a part of an air flow path from an air outlet of the cooling fan to the air outlet, The substrate extends in a direction intersecting the air flow path and along a plate surface of the substrate, and is rotatable about an axis provided at a position overlapping the irradiation element.

2. the housing has a first opposing surface that faces the first surface of the substrate, the first opposing surface includes an inclined portion inclined in a direction from the blower port of the cooling fan toward the exhaust port of the housing toward the board, 2. The light irradiation device according to claim 1, wherein the substrate is rotatable by the force of air blown from the air outlet of the cooling fan and blown against the substrate by the inclined portion.

3. The light irradiation device according to claim 2, wherein one end of the substrate sandwiching the axis is heavier than the other end, and air blown out of the air outlet of the cooling fan is blown toward the other end.

4. The light irradiation device according to claim 3, wherein the one end of the substrate, which is positioned on the cooling fan side across the axis, is provided with a rib that rises on the first surface side of the substrate, thereby making the one end heavier than the other end.

5. the housing has a second opposing surface opposing the second surface of the substrate; The light irradiation device according to claim 1 , wherein a rotation range of the base plate is restricted by the second opposing surface.

6. 3. The light irradiation device according to claim 1, wherein the shaft is supported by a support wall provided in the housing, and the substrate is positioned in the extending direction of the shaft by the support wall.

7. The first and second illumination elements are mounted on the substrate; The light irradiation device according to claim 1 or claim 2, wherein a first portion of the substrate on which the first irradiation element is mounted and a second portion of the substrate on which the second irradiation element is mounted are aligned in a direction intersecting the air flow path and extend in directions intersecting each other.

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