JP6932883B2 - Lighting device - Google Patents

Description

The present invention relates to, for example, a lighting device installed in a tunnel.

For example, tunnel lights are installed diagonally downward along both sides of the ceiling inside the tunnel to illuminate the road below. Since the corrosive environment inside the tunnel is severe due to humidity and exhaust gas concentration, the tunnel light has a closed structure as a whole. Typically, the tunnel light includes a box-shaped metal housing, a glass cover covering the front surface of the housing, an LED (Light Emitting Diode) light source arranged inside the housing, and the like. (See, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2016-46382

Tunnel lights were generally large-scale lighting devices, but recently, there are demands for weight reduction, improvement in installation workability, reduction in manufacturing cost, and the like.

In view of the above circumstances, an object of the present invention is to provide a lighting device capable of reducing weight and manufacturing cost.

In order to achieve the above object, the lighting device according to one embodiment of the present invention includes a frame portion, a light source, a cover member, and a sealing mechanism.
The frame portion has a main frame and a pair of side frames. The main frame has a pair of open ends facing each other in the uniaxial direction, a support surface provided between the pair of open ends, and a hollow portion communicating with the pair of open ends, and is closed. It is composed of a hollow block material with a linear cross-sectional shape. The pair of side frames close the pair of open ends.
The light source is arranged on the support surface.
The cover member is fixed to the frame portion and covers the light source.
The sealing mechanism has a first sealing portion and a second sealing portion. The first seal portion is arranged around the support surface and seals between the frame portion and the cover member. The second sealing portion is arranged at the pair of open end portions, and seals between the main frame and the pair of side frames.

In the above lighting device, since the main frame is made of a linear hollow block material having a closed cross section and having a hollow portion, a metal material lighter than the steel material is used to form a relatively high-strength frame body. can do. Since such a hollow block material can be manufactured by extrusion molding, the manufacturing cost can be reduced. Further, the sealing mechanism ensures waterproofness and dustproofness between the main frame, the pair of side frames, and the cover member.

The frame portion has an annular groove provided on the main frame and the pair of side frames so as to straddle the pair of opening ends, and the first seal portion is an annular groove mounted on the annular groove. It may be composed of a first sealing member.
As a result, the sealing property between each of the main frame and the pair of side frames and the cover member is ensured.

The second seal portion may be composed of a pair of second seal members each having both ends that are in elastic contact with the first seal member.
As a result, sufficient sealing property between the first sealing portion and the second sealing portion is ensured.

The pair of second sealing members may each have engaging recesses provided at both ends and partially engaged with the first sealing member.
As a result, the positioning accuracy between the first seal portion and the second seal portion is improved, and stable sealability is ensured.

The lighting device may further include a fixing mechanism. The fixing mechanism has a plurality of fasteners, a plurality of spacers, and a plurality of shock absorbers.
The plurality of fasteners fix the cover member to the frame portion.
Each of the plurality of spacers has a screw hole for screwing with the plurality of fasteners, and is attached to the support surface.
The plurality of shock absorbers are mounted between the plurality of fasteners and the plurality of spacers, and sandwich the cover member.
Since each spacer is configured to be adjustable in height, it can be stably fixed to the frame portion without damaging the cover member.

The annular groove has a groove portion for accommodating the first sealing member and a pair of annular edge portions facing each other in the width direction of the groove portion, and the first sealing member has the pair of annular edge portions. It may have a bulging portion that bulges between the cover member and the cover member.
As a result, each fastener can be fixed with a predetermined tightening torque without damaging the cover member.

The cover member may be made of flat glass.

The light source may include a plurality of light emitting elements arranged in a matrix on the support surface. As the light emitting element, an LED is typically used.

The lighting device may further include a control unit. The control unit is arranged in the hollow portion and is configured to supply power to the plurality of light emitting elements.

As described above, according to the lighting device of the present invention, it is possible to reduce the weight and the manufacturing cost.

It is an exploded perspective view of the lighting apparatus which concerns on one Embodiment of this invention. It is a top view of the said lighting apparatus. It is a side view of the said lighting apparatus. It is a side sectional view of the said lighting apparatus. It is a front view seen from the opening end side of the main frame in the said lighting apparatus. It is a front view which shows the inner surface structure of the side frame in the said lighting apparatus. It is a schematic explaining the cross-sectional view of the 1st seal part and its operation in the said lighting apparatus. It is a front view of the 2nd seal part in the said lighting apparatus. It is sectional drawing of the main part of the said lighting apparatus.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 is an exploded perspective view of the lighting device according to the embodiment of the present invention, FIG. 2 is a plan view of the lighting device, FIG. 3 is a side view of the lighting device, and FIG. 4 is a side sectional view of the lighting device. be.
In each figure, the X-axis, the Y-axis, and the Z-axis show three axial directions orthogonal to each other, and the X-axis corresponds to the longitudinal direction of the illuminating device.

[overall structure]
The lighting device 100 of the present embodiment is configured as a tunnel light that illuminates the inside of the tunnel. A plurality of lighting devices 100 are typically arranged along both sides of the ceiling inside the tunnel in the longitudinal direction thereof.

The lighting device 100 includes a frame portion 10, a light source 20, a cover member 30, a sealing mechanism 40, and a fixing mechanism 50.

(Frame part)
The frame portion 10 includes a main frame 11 and a pair of side frames 12A and 12B.

The main frame 11 is composed of a linear hollow block material having a closed cross section and having a pair of open end portions 11A and 11B facing each other in the X-axis direction and a hollow portion 11s communicating with the pair of open end portions 11A and 11B. Will be done. In the present embodiment, the main frame 11 is made of an extruded product of aluminum or an alloy thereof, and is formed into a substantially square tubular shape having a longitudinal direction in the X-axis direction, a width direction in the Y-axis direction, and a thickness direction in the Z-axis direction. NS.

The size of each part of the main frame 11 is not particularly limited, and is, for example, 900 to 1000 mm in length, 120 mm to 130 mm in width, and 90 to 100 mm in height. In the present embodiment, since the main frame 11 is made of an extruded product, it can be easily cut out to an arbitrary length dimension.

FIG. 5 is a front view of the main frame 11 as viewed from the open end 11A (11B) side. FIG. 6 is a front view showing the inner surface structure of the side frame 12A (12B).

The main frame 11 has a support surface 110 that supports the light source 20, a bottom surface 111 that faces the support surface 110, and two side surfaces 112. Each side surface 112 has an extension portion 112t that extends toward the cover member 30 from the support surface 110. Since the main frame 11 is made of an extruded product, it has a uniform cross-sectional shape in the X-axis direction. The pair of open end portions 11A and 11B communicate with each other via the hollow portion 11s.

The pair of side frames 12A and 12B are attached to the pair of open end portions 11A and 11B to close the open end portions 11A and 11B, respectively. Like the main frame 11, the side frames 12A and 12B are made of a metal material such as aluminum.

As shown in FIG. 6, the pair of side frames 12A and 12B are formed in a substantially rectangular plate shape having substantially the same shape as the pair of open end portions 11A and 11B. The pair of side frames 12A and 12B have mounting surfaces 121 on their inner surfaces that support the plate-shaped second sealing members 42A and 42B as the second sealing portion, respectively. A plurality of protrusions 122 for positioning the second seal members 42A and 42B are erected on the mounting surface 121. The side frames 12A and 12B are attached to the open end portions 11A and 11B via the second sealing members 42A and 42B supported by the mounting surface 121.

A plurality of screw members N1 are used for fixing the side frames 12A and 12B to the open end portions 11A and 11B. The plurality of screw members N1 are inserted into a plurality of insertion holes 123 (see FIG. 6) provided on the peripheral edges of the side frames 12A and 12B, and a plurality of screw receivers integrally provided on the open end portions 11A and 11B. It is screwed to the portion 113 (see FIG. 5).

As shown in FIG. 1, the frame portion 10 has an annular groove 13 for accommodating the annular first seal member 41 as the first seal portion. The annular groove 13 is provided in the main frame 11 and the pair of side frames 12A and 12B so as to straddle the pair of open ends.

The annular groove 13 is formed by combining a pair of straight portions 131 parallel to the X-axis and a pair of turn portions 132 connected to the pair of straight portions 131. The pair of straight portions 131 are formed inside the extending portions 112t on both side surfaces 112 of the main frame 11 and face the both side edges of the support surface 110 at a certain distance (see FIG. 5). The pair of turn portions 132 are recessed in the side frames 12A and 12B, and both ends of each turn portion 132 face the pair of straight portions 131 via the opening end portions 11A and 11B, respectively.

The side frame 12A is provided with a cable insertion hole 124 into which a bush member 61 through which a power cable (not shown) is inserted is mounted. The side frames 12A and 12B are further provided with screw holes 125 and the like into which screw members N2 for fixing the mounting bracket 62 are screwed in at predetermined positions (see FIGS. 1 and 6).

(light source)
The light source 20 is composed of a plurality of LED substrates 21 including a plurality of light emitting elements 20v arranged in a matrix on the support surface 110. (See FIG. 2). The light emitting element 20v is typically composed of an LED (light emitting diode). The emission color of the light emitting element 20v is not particularly limited, and typically emits white light. The LED substrate 21 constitutes a surface emitter by being arranged on the support surface 110.

Each LED substrate 21 is fixed on the support surface 110 via a plurality of screw members N3. Since the support surface 110 forms a part of the main frame 11 and the main frame 11 is made of a metal material, the heat dissipation of each LED substrate 21 is ensured.

The LED boards 21 are electrically connected to each other via an appropriate connecting member such as a connector. A communication hole (not shown) that communicates with the hollow portion 11s is provided at an appropriate position on the support surface 110, and the control unit 22 is housed in the hollow portion 11s via a cable member that passes through the communication hole. (See FIG. 4) and the predetermined LED substrate 21 are electrically connected. As a result, predetermined power is supplied from the control unit 22 to each LED board 21. The control unit 22 is fixed to the bottom surface 111 of the main frame 11 via a plurality of screw members N4 (see FIGS. 3, 4, and 9).

(Cover member)
The cover member 30 is made of a translucent plate member, and is typically made of a plate glass made of tempered glass. As a result, high light transmission and durability as the cover member 30 can be ensured. Not limited to this, the cover member 30 may be made of a translucent plastic material.

The cover member 30 has a rectangular planar shape having a long side in the X-axis direction, and the length thereof is formed to be larger than the long side of the main frame 11. The width dimension of the cover member 30 along the Y-axis direction is formed to be smaller than the width dimension of the main frame 11, and the peripheral edge portion thereof is formed with the extending portion 112t of the side surface 112 of the main frame 11 and the upper end portion of the side frame 12. Facing in the Y-axis direction (see FIGS. 2 and 3).

The cover member 30 covers the light source 20 (LED substrate 21) on the support surface 110 by being attached to the frame portion 10 via the first seal member 41 mounted in the annular groove 13.

The cover member 30 is fixed to the frame portion 10 via the fixing mechanism 50. As will be described later, the fixing mechanism 50 has a plurality of fasteners N5 for fixing the cover member 30 to the frame portion 10. A plurality of insertion holes 31 through which a plurality of fasteners N5 are inserted are provided on the peripheral edge of the cover member 30.

(Seal mechanism)
The sealing mechanism 40 includes a first sealing member 41 (first sealing portion) and a pair of second sealing members 42A and 42B (second sealing portion).

The first sealing member 41 is formed in an annular shape and is arranged around the support surface 110 to seal between the frame portion 10 and the cover member 30. The first sealing member 41 is typically made of an elastic material such as synthetic rubber and is mounted in the annular groove 13 of the frame portion 10.

FIG. 7A is a cross-sectional view of the first sealing member 41. As shown in the figure, the first sealing member 41 has a main body portion 410 having an inverted trapezoidal cross section whose upper surface facing the cover member 30 is wider than the bottom surface facing the annular groove 13. The first sealing member 41 has a plurality of (three in this example) annular protrusions 411 provided on the upper surface of the main body 410 and a plurality of (two in this example) annular protrusions provided on the bottom surface of the main body 410. It has a protrusion 412.

The annular groove 13 has a groove portion 13a for accommodating the first sealing member and a pair of annular edge portions 13b facing each other in the width direction of the groove portion 13a. As shown in FIG. 7A, the groove portion 13a is formed at a depth smaller than the thickness of the first sealing member 41.

The annular edge portion 13b is a portion forming the upper surface of the annular groove 13 facing the cover member 30, and in the present embodiment, the ridge line portion continuously provided at the upper end of the groove portion 13a and the flat surface portion extending outward thereof. And include. The form of the annular edge portion 13b is not limited to this, and may be composed of other three-dimensional structures such as a curved portion (curved surface portion) and a bent portion having a shape convex toward the cover member 30.

When the cover member 30 is fixed, the protrusions 411 and 412 are sandwiched between the bottom portion of the annular groove 13 and the lower surface of the cover member 30, and are crushed toward the main body portion 410, respectively, as shown in FIG. 7B. It elastically deforms like this. The first seal member 41 is formed with a bulging portion 413 that bulges between the pair of annular edge portions 13b and the cover member 30 when a plurality of fasteners N5 are fastened with a predetermined tightening torque. (See FIG. 7B).

The pair of second sealing members 42A and 42B are formed in a plate shape and are arranged on the pair of open end portions 11A and 11B to seal between the main frame 11 and the pair of side frames 12A and 12B. .. The pair of second sealing members 42A and 42B have the same configuration, respectively, and are typically made of an elastic material such as synthetic rubber, and are formed on the mounting surface 121 on the inner surface side of the pair of side frames 12A and 12B. It is installed.

FIG. 8 is a front view of the second sealing member 42A (42B). As shown in the figure, the second sealing member 42A (42B) has a plate-shaped main body portion 420 having a partially rectangular ring (U-shaped) having an open upper side. The main body 420 is formed in a shape corresponding to the mounting surfaces 121 of the side frames 12A and 12B (see FIG. 6), and includes a plurality of positioning holes 122 that fit with the plurality of protrusions 122 on the mounting surface 121. It has a plurality of through holes 423 through which a plurality of screw members N1 are inserted. The main body portion 420 is elastically sandwiched between the open end portions 11A and 11B of the main frame 11 and the mounting surfaces 121 of the side frames 12A and 12B by tightening the plurality of screw members N1.

Both end portions 421 of the main body portion 420 are provided with engaging recesses 421a that partially engage with the first seal member 41, respectively. The engaging recess 421a is formed in a cross-sectional shape similar to that of the groove portion 13a of the annular groove 13, and is configured to be able to elastically contact the bottom surface portion of a part of the first sealing member 41. As a result, the sealing property between the first sealing member 41 and the second sealing members 42A and 42B is ensured.

The engaging recess 421a may be arranged between the main frame 11 and the side frames 12A and 12B so as to project inward of the annular groove 13. As a result, when the cover member 30 is fixed to the frame portion 10, the first seal member 41 and the engaging recess 421a are pressed against each other, and the first seal member 41 and the second seal members 42A and 42B are brought into contact with each other. The adhesion between them is enhanced.

(Fixing mechanism)
FIG. 9 is a cross-sectional view of a main part of the lighting device 100 showing the details of the fixing mechanism 50. The fixing mechanism 50 includes a plurality of fasteners N5 for fixing the cover member 30 to the frame portion 10, a plurality of spacers 51, and a plurality of buffers 52.

The plurality of spacers 51 are typically made of a metal material and have a screw portion 51a screwed into the support surface 110 and a screw hole 51b screwed into the plurality of fasteners N5. The plurality of spacers 51 are attached to the support surface 110 via the screw portion 51a. The spacer 51 may be configured so that the height of the spacer 51 can be adjusted with respect to the support surface 110.

The plurality of buffers 52 are mounted between the plurality of fasteners N5 and the plurality of spacers 51, and are composed of two buffer members 521 and 522 that sandwich the cover member 30. Each cushioning member 521, 522 is made of an elastic material. The first cushioning member 521 has a cylindrical shape with a flange, is mounted in the insertion hole 31 of the cover member 30, and is interposed between the fastener N5 and the washer 53 and the cover member 30. The second cushioning member 522 is interposed between the spacer 51 and the cover member 30.

Each buffer 52 provides cushioning to protect the cover member 30 from damage while avoiding direct contact of the glass cover member 30 with the metal fastener N5 or the spacer 51. The buffer 52 also functions as a sealing component for preventing the intrusion of moisture, dust, and gas from the insertion hole 31 of the cover member 30.

The mounting position of the spacer 51 is not particularly limited, and in the present embodiment, each spacer 51 is mounted on the peripheral edge of the support surface 110 in the vicinity of the annular groove 13. As a result, the load acting on the cover member 30 when the fastener N5 is tightened on the spacer 51 can be efficiently absorbed by the first seal member 41. Further, when the bulging portion 413 (see FIG. 7B) is formed on the first sealing member 41, a predetermined tightening torque can be generated on the fastener N5 by forming the bulging portion 413.

Further, since each spacer 51 is configured so that the height can be adjusted with respect to the support surface 110, the height position of the cover member 30 with respect to the support surface 110 can be arbitrarily adjusted. Therefore, it is relatively easy to set the tightening torque of the fastener N5 that does not damage the cover member 30 and can appropriately fix the cover member 30 to the frame portion 10 via the first seal member 41. Is possible.

[How to assemble the lighting device]
Next, a method of assembling the lighting device of the present embodiment configured as described above will be described.

A plurality of LED substrates 21 and a plurality of spacers 51 constituting the light source 20 are fixed to the support surface 110 of the main frame 11, and a control unit 22 for controlling the light source 20 is housed in the hollow portion 11s of the main frame 11. NS. A second cushioning member 522 is attached to each spacer 51. On the other hand, the seal members 42A and 42B are mounted on the mounting surfaces 121 of the pair of side frames 12A and 12B, respectively.

The side frames 12A and 12B are fixed to the pair of open end portions 11A and 11B of the main frame 11 with the second seal members 42A and 42B interposed therebetween, respectively, via the plurality of screw members N2. As a result, the space between the main frame 11 and the side frames 12A and 12B is sealed, and the frame portion 10 is assembled.

Subsequently, the first seal member 41 is attached to the annular groove 13 of the frame portion 10. As shown in FIG. 7A, the first sealing member 41 is mounted on the groove portion 13a of the annular groove 13 with the annular projection 411 facing upward. The first sealing member 41 engages with the engaging recesses 421a of the second sealing members 42A and 42B at the boundary between the main frame 11 and the side frames 12A and 12B, whereby the second sealing member 42A, Positioning with 42B is ensured.

A first cushioning member 521 is attached to each of the plurality of insertion holes 31 of the cover member 30. The cover member 30 is placed on the first sealing member 41 in the annular groove 13 so that each insertion hole 31 is aligned with the screw hole 51b of the spacer 51 on the support surface 110. Then, the fastener N5 is inserted into each insertion hole 31 of the cover member 30, and each fastener N5 is tightened with a predetermined tightening torque, so that the cover member 30 is fixed to the frame portion 10.

At this time, by tightening the fastener N5, the annular protrusions 411 and 412 of the first seal member 41 are crushed between the cover member 30 and the groove portion 13a of the annular groove 13, and the cover member 30 and the annular groove 13 are crushed. It bulges in the gap between the pair of annular edge portions 13b to form the bulging portion 413. The tightening force of the fastener N5 gradually increases as the thickness of the bulging portion 413 decreases, and a predetermined tightening torque is generated when the bulging portion 413 reaches a predetermined thickness.

In this way, since the tightening torque of the fastener N5 is defined by the thickness of the bulging portion 413, damage to the cover member 30 due to contact between the cover member 30 and the annular edge portion 13b is prevented. Further, since a predetermined cushioning force for the cover member 30 is secured by the intervention of the bulging portion 413, the cover member 30 can be protected even when the tightening amount of the fastener N5 becomes excessive. Further, since the spacer 51 is arranged adjacent to the annular groove 13, the distance between the tightening position of the cover member 30 by the fastener N5 and the first seal member 41 is small, and therefore the moment acting on the tightening position is also small. Minimized. Therefore, damage to the cover member 30 during assembly is effectively prevented.

Further, as the cover member 30 compresses and deforms the first seal member 41, the adhesion between the first seal member 41 and the second seal members 42A and 42B is enhanced. As a result, the integrity between the first seal member 41 and the second seal members 42A and 42B is enhanced, so that the desired waterproofness, dustproofness, and airtightness of the lighting device 100 are ensured.

As described above, according to the lighting device 100 of the present embodiment, since the main frame 11 is made of a linear hollow block material having a closed cross section having a hollow portion 11s, a metal material that is lighter than a steel material can be used. It can be used to construct a relatively high-strength frame body.

Since such a hollow block material can be manufactured by extrusion molding, the manufacturing cost can be reduced.

Further, the sealing mechanism 40 ensures waterproofness, dustproofness, and airtightness between the main frame 11, the pair of side frames 12A and 12B, and the cover member 30.

Further, according to the lighting device of the present embodiment, since the first seal member 41 is configured to be able to form a bulging portion 413 that prevents contact between the cover member 30 and the annular groove 13, the cover member It is possible to obtain a constant stopper function against the tightening force of the cover member 30 by the fastener N5 while ensuring the desired cushioning property with respect to 30. As a result, even when the cover member 30 is made of glass, the lighting device 100 can be stably assembled without damaging the cover member 30.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made.

For example, in the above embodiment, as the sealing mechanism 40, the first sealing member 41 as the first sealing portion and the pair of second sealing members 42A and 42B as the second sealing portion are formed of separate members. However, the present invention is not limited to this, and the first and second seal portions may be integrally formed with each other by integral molding or the like.

Further, in the above embodiment, the first seal member 41 in the annular groove 13 is configured to obtain a stopper function for the amount of tightening to the cover member 30 by the fastener N5, but instead of or instead of this. In addition, the spacer 51 may be configured so as to regulate the tightening amount of the fastener N5 by the depth of the screw hole 51b of the spacer 51. In this case, the spacer 51 is configured so that the height can be adjusted with respect to the support surface 110, so that the tightening torque can be easily set, and the cover member 30 is installed at a desired height position from the support surface 110. Is possible.

Further, in the above embodiment, the tunnel light has been described as an example of the lighting device, but the present invention is not limited to this, and the present invention can be applied to various lighting lights such as road lights, street lights, and security lights.

10 ... Frame part 11 ... Main frame 11A, 11B ... Opening end parts 12A, 12B ... Side frame 13 ... Circular groove 13a ... Groove part 13b ... Circular edge part 20 ... Light source 21 ... LED board 22 ... Control unit 30 ... Cover member 40 ... Sealing mechanism 41 ... First sealing member 42A, 42B ... Second sealing member 50 ... Fixing mechanism 51 ... Spacer 52 ... Buffer 100 ... Lighting device 110 ... Support surface 413 ... Swelling part 421a ... Engagement recess

Claims (7)

It has a pair of open ends facing each other in the uniaxial direction, a support surface provided between the pair of open ends, and a hollow portion communicating with the pair of open ends, and has a linear closed cross-sectional shape. A main frame made of a hollow block material, a pair of side frames for closing the pair of open ends, and an annular shape provided on the main frame and the pair of side frames so as to straddle the pair of open ends. A frame portion having a groove,
A light source arranged on the support surface and
A cover member fixed to the frame portion and covering the light source,
A first seal portion arranged around the support surface, sealing between the frame portion and the cover member, and composed of an annular first seal member mounted on the annular groove, and the pair. A sealing mechanism having a second sealing portion arranged at the end of the opening and sealing between the main frame and the pair of side frames .
It has a plurality of fasteners that are inserted into the cover member and fix the cover member to the main frame portion, and screw holes that are screwed with the plurality of fasteners, and are attached to the support surface and have the annular groove. Lighting including a plurality of spacers arranged adjacent to each other, and a plurality of shock absorbers mounted between the plurality of fasteners and the plurality of spacers and sandwiching the cover member, and a fixing mechanism having the plurality of spacers. Device. The lighting device according to claim 1.
The second seal portion is a lighting device composed of a pair of second seal members having both ends elastically in contact with the first seal member. The lighting device according to claim 2.
The pair of second seal members are illuminating devices provided at both ends thereof and having engaging recesses that partially engage with the first seal member. The lighting device according to any one of claims 1 to 3.
The annular groove has a groove portion for accommodating the first sealing member and a pair of annular edge portions facing each other in the width direction of the groove portion.
The first seal member is a lighting device having a bulging portion that bulges between the pair of annular edge portions and the cover member. The lighting device according to any one of claims 1 to 4.
The cover member is a lighting device made of flat glass. The lighting device according to any one of claims 1 to 5.
The light source is an illuminating device including a plurality of light emitting elements arranged in a matrix on the support surface. The lighting device according to claim 6.
A lighting device that is arranged in the hollow portion and further includes a control unit that supplies power to the plurality of light emitting elements.

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