JP7466265B2 - Heat sink and lighting device - Google Patents

Description

This invention relates to a heat sink and a lighting device that uses this heat sink.

Conventionally, there have been lighting fixtures that use a heat sink to efficiently dissipate heat from a light source such as an LED. The heat sink has a plurality of heat dissipation fins to increase the heat dissipation area and thus to efficiently dissipate heat (for example, Patent Document 1).
However, heat sinks have the problem that they are heavy because they have many fins.

JP 2016-207368 A

Therefore, the objective is to provide a heat sink that can suppress weight increase, and a lighting fixture that has this heat sink.

The heat sink of the present invention comprises:
A base portion to which the light source portion is attached;
a plurality of fin portions arranged such that the base portion is located between the fin portions and the light source portion;
Each fin portion is provided with
a fin main portion having a plate shape rising from the base portion and having one side portion along a rising direction and the other side portion along the rising direction;
The fin main portion has a plurality of fin branch portions branching off from the other side portion of the fin main portion and extending away from each other as the fin main portion moves in a direction from the one side portion to the other side portion.

The heat sink of this invention has multiple fin branches, which improves heat dissipation, and the number of fin branches can be reduced. Therefore, the heat sink of this invention can reduce weight increase.

FIG. 1 is a perspective view of a lighting device according to a first embodiment. FIG. 2 is a perspective view of the lighting device according to the first embodiment, as viewed from a downward direction Z2. FIG. 2 is an exploded perspective view of the lighting device according to the first embodiment. FIG. 2 is a detailed exploded perspective view of the lighting device according to the first embodiment. FIG. 2 is a perspective view of a heat sink according to the first embodiment. FIG. 2 is a plan view of a heat sink according to the first embodiment. FIG. 2 is a perspective view of the electric wire cover according to the first embodiment. FIG. 2 is a perspective view of a heat sink with a wire cover attached, according to the first embodiment. FIG. 2 is an exploded perspective view of the light-emitting section according to the first embodiment. FIG. 2 is a perspective view of the cover portion according to the first embodiment. FIG. 13 is another perspective view of the cover portion according to the first embodiment. FIG. 2 is a perspective view of the frame portion according to the first embodiment. FIG. 2 is a perspective view of the power supply device according to the first embodiment, as viewed from a downward direction Z2. FIG. 2 is an exploded perspective view of the power supply device according to the first embodiment, taken from a downward direction Z2. FIG. 2 is an exploded perspective view of the power supply device according to the first embodiment, taken from an upward direction Z1. FIG. 1 is a diagram of the first embodiment and is a plan view of a lighting device. FIG. 11 is a diagram showing the relationship between the distance L of the power supply device and the temperature of the light source according to the first embodiment. FIG. 11 is an assembly diagram showing attachment of the frame portion to the cover portion according to the first embodiment. FIG. 1 is a diagram of the first embodiment, showing a method of installing the lighting device. FIG. 1 is a diagram of the first embodiment showing a tall lighting fixture. FIG. 11 is a diagram showing a modified example of the cover portion according to the first embodiment. FIG. 11 is a perspective view showing a modified example of the heat sink according to the first embodiment. FIG. 11 is a plan view of a modified example of the heat sink according to the first embodiment. FIG. 24 is a partially enlarged view of FIG. 23 . FIG. 1 is a diagram of the first embodiment showing the heat dissipation properties of aluminum material.

The following describes an embodiment of the present invention with reference to the drawings. Note that in each drawing, identical or corresponding parts are given the same reference numerals. In the description of the embodiment, the description of identical or corresponding parts will be omitted or simplified as appropriate.

Embodiment 1.
***Configuration Description***
A configuration of a lighting device 1 according to the embodiment 1 will be described. In the embodiment 1, a lighting fixture that is accommodated in a mounting hole provided in a mounting portion such as a ceiling will be described. For example, this lighting fixture is a downlight.

The first embodiment is characterized in particular by the cover portion 230 , the heat sink 100 and the power supply device 20 .
FIG. 1 is a perspective view of a lighting device 1. As shown in FIG.
FIG. 2 is a perspective view of the lighting device 1 as viewed from a downward direction Z2.
FIG. 3 is an exploded perspective view of the lighting device 1. As shown in FIG.
FIG. 4 is an exploded perspective view of the lighting device 1 in further detail.

The lighting device 1 comprises a lighting fixture 10 provided on a mounting portion, and a power supply unit 20 that is rotatably mounted on the lighting fixture 10. The lighting device 1 excluding the power supply unit 20 is called the lighting fixture 10. As shown in FIG. 4, the lighting fixture 10 comprises a heat sink 100, a light source unit 200 having a cover unit 230, and a frame unit 300.

(Heat sink 100)
FIG. 5 is a perspective view of the heat sink 100.
6 is a plan view of the heat sink 100. As shown in FIGS. 5 and 6, the heat sink 100 includes a plate-shaped base portion 110, a fin portion 120 rising from the base portion 110, a power supply holding portion 130, and a cord holding portion 140. The heat sink 100 is formed by press molding, and can be integrally molded by press molding. The press molding is, for example, cold forging. By using press molding, a material with a high aluminum content (for example, 99 wt % or more) can be used for the heat sink 100.

(Base portion 110)
The base portion 110 is a plate-like body. The light source portion 200 is attached to the base portion 110. One surface of the base portion 110 is a light source mounting surface 111 on which the light source portion 200 is attached. The other surface, which is the reverse side of the light source mounting surface 111, is a fin arrangement surface 112 on which the fin portion 120 stands.
The heat sink 100 also has a cylindrical portion 113 on the fin arrangement surface 112, the cylindrical portion 113 protruding in a cylindrical shape from the center portion of the base portion 110. The cylindrical portion 113 is provided at a position facing the back surface of the light source portion 200 attached to the light source attachment surface 111.

(Fin portion 120)
The fin portion 120 will now be described. The fin portion 120 has a fin main portion 121, a fin branch portion 122, and end fins 123. As shown in FIG.
The heat sink 100 of the first embodiment has six fin portions 120, but the number of fin portions 120 is not limited to six. The heat sink 100 has a plurality of fin portions 120. The plurality of fin portions 120 are arranged so that the base portion 110 is located between the light source portion 200. Each fin portion 120 has a fin main portion 121 and a plurality of fin branch portions 122. In FIG. 6, three fin branch portions 122 are branched, but four or more fin branch portions may be branched. The fin branch portions 122 are bent at a bend portion 125. The fin main portion 121 is a plate-like portion rising from the base portion 110 and has one side portion 121a along the rising direction 120a and the other side portion 121b along the rising direction 120a. Each fin branch 122 branches from a first branch point 126a on the other side 121b of the fin main portion 121, and extends away from each other as it moves from one side 121a to the other side 121b. Also, the fin branch 122 has a plurality of end fins 123 branched from a second branch point 126b at the end in the direction in which they extend away from each other. In FIG. 6, two end fins 123 are branched, but three or more may be branched. In FIG. 6, end fins 123 are formed at the ends of 14 fin branch parts 122, but it is sufficient that multiple end fins 123 are formed at the end of at least one fin branch part 122. Also, in FIG. 6, two end fins 123 are branched, but the number of branched end fins 123 may be three or more.

The fin section 120 is provided so as to rise in a substantially vertical direction from the fin arrangement surface 112, and is formed radially from the central portion of the fin arrangement surface 112. The fin section 120 is provided radially from the tube section 113 to the outside on the fin arrangement surface 112. The fin section 120 has a fin branch section 122 that branches off from the fin main section 121, thereby increasing the heat dissipation area. Since the end of the fin branch section 122 is formed with an end fin 123, the heat dissipation area increases by the amount of the end fin 123. In other words, heat can be dissipated not only from the outer surface of the fin branch section 122 but also from the inner surface 123a of the end fin 123, so that the heat dissipation efficiency is increased. In addition, the fin section 120 can improve the heat dissipation efficiency by the end fin 123, so that the number of fin sections 120 protruding from the fin arrangement surface 112 can be reduced, and as a result of this reduction, the space between adjacent fin sections 120 can be made larger to facilitate heat dissipation. The distance between adjacent fin portions 120 is, for example, about 5 mm. This distance of about 5 mm between adjacent fin portions 120 is the length of the distance L2 shown in FIG. 24 described later. By providing the fin branch portion 122 from the fin main portion 121, it is possible to increase the distance between the ends of adjacent fin main portions 121 on the center side of the base portion 110.

(Power supply holding unit 130)
In the heat sink 100, the power supply unit 20 that supplies power to the light source unit 200 is attached to a power supply holding unit 130. The power supply holding unit 130 is provided to protrude in a substantially vertical direction from the fin arrangement surface 112, and has an L-shaped horizontal cross section. The power supply holding units 130 are provided in pairs at the ends of the fin arrangement surface 112, and are provided with holding holes 131 to which the power supply units 20 are rotatably attached.

(Code holding unit 140)
The cord holding portion 140 is provided so as to protrude in a substantially vertical direction from the fin arrangement surface 112, and has a U-shaped horizontal cross section. The cord holding portion 140 is disposed between the pair of power supply holding portions 130, and the electric wire connecting the power supply unit 20 and the light source portion 200 is disposed inside the U-shape.

The heat sink 100 is formed by press molding. The heat sink 100 is formed by press molding aluminum material from the Z1 side to the Z2 side. When the heat sink 100 is formed by press molding, the fins cannot be formed large because they fall down due to the load of the press. In particular, it is difficult to lengthen the fins in the horizontal direction perpendicular to the direction from the Z1 side to the Z2 side, and it is difficult to provide one fin from the center part of the base part 110 to the outside. In contrast, the fin part 120 is formed from the fin branch part 122 and the end fin 123, so that the fin branch part 122 and the end fin 123 reinforce each other and can withstand the load of the press. Therefore, the fin part 120 can be provided from the center part of the base part 110 to the outside.

As shown in FIGS. 7 and 8, a wire cover 150 is attached to the power supply holding portion 130 of the heat sink 100.
FIG. 7 is a perspective view of the electric wire cover portion 150. As shown in FIG.
8 shows the heat sink 100 with the electric wire cover part 150 attached. The electric wire cover part 150 has a shape as shown in FIG. 7 and is attached to the power supply holding part 130 so as to cover the U-shaped opening of the cord holding part 140. The electric wire cover part 150 is attached so as to prevent the electric wire from coming off from the inside of the U-shape. The electric wire cover part 150 also has a power supply control part 151 at its upper end side that abuts against the power supply device 20. The power supply control part 151 abuts against a part of the power supply device 20 to control the rotation of the power supply device 20. The power supply control part 151 controls the rotation of the power supply device 20 so as to maintain a gap between the power supply device 20 and the heat sink 100.

(Light source unit 200)
As shown in FIG. 4 , the light source unit 200 has a light emitting unit 210 , a socket unit 220 that fixes the light emitting unit 210 to the heat sink 100 , and a cover unit 230 .

(Light Emitting Unit 210)
Fig. 9 is an exploded perspective view of the light-emitting unit 210. The light-emitting unit 210 includes a light-emitting element 211 and a substrate 212 on which the light-emitting element 211 is mounted. Note that in the light-emitting unit 210, the light-emitting element 210 may be a COB (chip-on-board) element as shown in Fig. 9, or a plurality of package-type elements may be used.

(Socket portion 220)
The socket unit 220 shown in FIG. 9 supplies power from the power supply device 20 to the light emitting unit 210. The socket unit 220 is fixed to the heat sink 100 while holding the light emitting unit 210. The socket unit 220 holds the light emitting unit 210 between a socket front part 221 that is open so that the light emitting element 211 is exposed and a socket back part 222 that covers the back side of the substrate 212 of the light emitting unit 210, and an electric wire (not shown) is connected to the socket unit 220. The light emitting unit 210 and the power supply device 20 are electrically connected via the electric wire. The socket front part 221 and the socket back part 222 are fixed by two clips 223. In the first embodiment, the light emitting unit 210 is fixed to the heat sink 100 using the socket unit 220, but the light emitting unit 210 may be fixed to the heat sink by a fixing method such as fixing to the heat sink as described in Japanese Patent No. 6158886.

(Cover portion 230)
10 and 11 are perspective views of the cover part 230. The cover part 230 is integrally molded from a resin material. As described later, the cover part 230 has a hook part 235 having a claw part 236 and a protrusion part 235a, and is attached to the heat sink 100. The cover part 230 has a cover main body part 231 having a circular opening (cover opening part 232) at the approximately central part, an inner wall part 233 formed to stand from the periphery of the cover opening part 232 of the cover main body part 231, and an outer wall part 234 formed to stand from the outer periphery of the cover main body part 231. Furthermore, the outer wall part 234 of the cover part 230 has a hook part 235 protruding so as to be elastically deformable, a claw part 236 provided at a position facing the hook part 235 across the cover opening part 232, and a frame receiving part 237 protruding outward from the outer wall part 234. The hook portion 235 has a structure that elastically deforms to hook onto the frame portion 300, similar to the first protrusion 434 described in Japanese Patent No. 6158886. The frame portion 300 is detachably attached to the cover portion 230 in a state where the cover portion 230 is attached to the base portion 110 of the heat sink 100 by a fixing member such as a screw. The cover portion 230 functions as a connection portion that fixes the frame portion 300 to the heat sink 100.

As shown in Fig. 4, the cover section 230 is provided with a light distribution control section 238 so as to cover the cover opening 232. The light distribution control section 238 has a lens shape, into which light from the light emitting section 210 is incident and which emits the incident light in a predetermined direction. The cross section of the light distribution control section 238 has a lens shape as shown in Fig. 18 described later. However, the shape of the light distribution control section 238 shown in Fig. 18 is just one example.
18 may be used as long as a predetermined light distribution can be obtained, for example, the light distribution control unit 238 may be in a flat plate shape. The method of attaching the cover unit 230 may be, for example, a method of engaging with the cover main body 231, like a light-transmitting cover.

(Frame portion 300)
12 is a perspective view of the frame unit 300. As described later, the frame unit 300 has a first hole forming portion 351 in which a first hole 350 into which the claw portion 236 is inserted is formed, and a second hole forming portion 361 in which a second hole 360 into which a protrusion of the hook portion 235 is inserted is formed and in which the periphery of the second hole 360 is pressed by the hook portion 235 due to the elastic force of the hook portion trying to return to its original shape, and controls the irradiation angle of the light irradiated from the light source unit 200.

As shown in FIG. 12, the frame 300 includes a flange 310, a rising portion 320, and a sloping portion 370 (FIG. 18(a)). The flange 310 abuts against the edge of a circular embedding hole 501 formed in the mounting portion 500. The rising portion 320 rises in a substantially vertical direction from the flange 310. Three mounting springs 400 are attached to the rising portion 320. The rising portion 320 also has a first hole 350 and a second hole 360 formed therein. The sloping portion 370 is formed diagonally inside the flange 310, and has a circular opening 371 in the approximate center. The frame 300 may be formed as a one-piece molded product made of resin.

The above is the main configuration of the lighting fixture 10.

Next, the configuration of the power supply device 20 will be described with reference to FIGS.
FIG. 13 is a perspective view of the power supply device 20 as viewed from the lower Z2 side.
FIG. 14 is an exploded perspective view of the power supply device 20 as viewed from the downward Z2 side.
FIG. 15 is an exploded perspective view of the power supply device 20 as viewed from the upper Z1 side.
FIG. 16 is a plan view of the lighting device 1.

(Power supply device 20)
The power supply device 20 has a lighting circuit board 21 that converts power from a commercial power source and lights the light source unit 200, a terminal block 22 that supplies power from the commercial power source to the lighting circuit board 21, a case main body 23 to which the lighting circuit board 21 and the terminal block 22 are attached, and a case lid 24 that is attached to the case main body 23 so as to cover the lighting circuit board 21. The terminal block 22 has a power terminal block 22a and a dimming terminal block 22b arranged thereon.

(Case 25, case main body 23)
The case 25 includes a case main body 23 and a case lid 24. The case main body 23 includes a main body bottom 23a, a main body side 23b, and an arm 23c. The main body bottom 23a includes a first plate 23aa facing the lighting circuit board 21 and a second plate 23ab facing the terminal block 22, which are formed to have a step. When the case main body 23 is viewed from the top and the case lid 24 is viewed from the bottom in FIG. 14, the first plate 23aa is a top plate. Hereinafter, the first plate 23aa may be referred to as the top plate 23aa. The main body side 23b is provided so as to protrude from the side of the main body bottom 23a, and includes an engagement portion 23ba that holds the lighting circuit board 21. The arm 23c is provided at the end of the main body bottom 23a opposite to the terminal block 22. The arm portions 23 c are provided in a pair and are rotatably connected to holding holes 131 of the power supply holding portion 130 of the heat sink 100 .

(Case lid portion 24)
The case lid 24 has a lid bottom 24a, a lid side 24b, and an inclined portion 24c. The lid bottom 24a covers the lighting circuit board 21, and the terminal block 22 is exposed. The lid side 24b is provided so as to protrude from the side of the lid bottom 24a so as to sandwich the main body side 23b. The lid side 24b engages with the main body side 24b and is formed to a length that protrudes beyond the terminal block 22. The inclined portion 24c is formed on the side of the lid bottom 24a opposite the terminal block 22 side, and is formed obliquely toward the arm 23c of the main body bottom 23a. An electric wire that connects the lighting circuit board 21 and the light source unit 200 is accommodated between the main body bottom 23a and the inclined portion 24c. This electric wire is housed inside the U-shape of the cord holding portion 140 of the heat sink 100, between the main body bottom portion 23a and the inclined portion 24c.

16, the power supply unit 20 is disposed so that the main body bottom surface portion 23a faces a part of the fin arrangement surface 112 of the heat sink 100. Furthermore, the rotation axis 39 (FIGS. 1 and 16) of the power supply unit 20 is disposed inside the outer diameter of the heat sink 100. In this case, the power supply unit 20 is disposed so as not to affect the heat dissipation of the heat sink 100.
FIG. 17 is a graph showing the change in temperature of the COB of the light-emitting unit 210 by changing the distance L, where the distance L is the distance from the center A of the tube portion 113 in the plan view shown in FIG. 16 to the end closest to the center A in the longitudinal direction of the power supply unit 20. The numerical values are only examples. As shown in FIG. 17, the temperature T of the COB, which is the light source unit, is expressed by a function f of T=f(L) with respect to the distance L from the power supply unit 20 to which power is being supplied. The temperature T of the COB decreases linearly as the distance L increases, and transitions to a transition range in which the COB transitions to a saturated state, and reaches the saturated state through this transition range. It is preferable that the power supply unit 20 is attached to the heat sink 100 at a position L within the transition range. In this embodiment, the power supply unit 20 is attached to the heat sink 100 with the distance L being 40 mm. As shown in FIG. 17, when the distance L is 40 mm, it can be seen that the power supply unit 20 can be fixed to the heat sink 100 with the influence on heat dissipation being suppressed.
Furthermore, when the distance L is further increased from 40 mm, the effect of the temperature due to the power supply device 20 becomes saturated.

The above is the configuration of each part of the power supply unit 20. Next, the process of attaching the frame portion 300 of the lighting fixture 10 will be explained using Figure 18.

(Frame 300 Mounting Process)
FIG. 18 shows the attachment process for attaching the frame portion 300 to the cover portion 230. As shown in FIG.
FIG. 18A shows the frame 300 in a state before being attached to the cover 230 provided on the heat sink 100 .
FIG. 18B shows a state in which the claws 236 (FIG. 10) of the cover 230 are hooked into the first holes 350 (FIG. 12) of the frame 300. As shown in FIG.
Fig. 18(c) shows a state in which the frame 300 has been rotated from the state shown in Fig. 18(b) around the first hole 350 into which the claw 236 is inserted as the axis of rotation. Fig. 18(c) shows a state in which the hook 235 (Fig. 10) is engaged with the second hole 360 (Fig. 12) of the frame 300.

The frame 300 is held by the cover 230 as the hook 235 is elastically deformed by the end of the rising portion 320 coming into contact with and pressing against it as the frame 300 rotates, and the end of the rising portion 320 (FIG. 12) comes into contact with the frame receiving portion 237 (FIG. 10) of the cover 230 so that the frame receiving portion 237 rests on the end of the rising portion 320 (FIG. 12) in the state of FIG. 18(c).
In other words, the cover portion 230 holds the frame portion 300 so as to cover the rising portion 320 of the frame portion 300 .

The frame 300 is capable of rotating the second hole forming portion 361 toward the hook portion 235 after the first hole forming portion 351 is hooked onto the hook portion 236 by inserting the claw portion 236 of the cover portion 230 into the first hole 350 of the first hole forming portion 351.

The above is the method for attaching the frame portion 300 to the cover portion 230. Next, we will explain the method for attaching the lighting device 1 to the mounting portion.

(Method of installing the lighting device 1 on the mounting portion)
FIG. 19 shows a method of attaching the lighting device 1 to a mounting portion.
FIG. 19A shows the state before the lighting device 1 is attached to the attachment hole 501 provided in the attachment portion 500 .

FIG. 19B shows the state in which the 501 power supply unit 20 is inserted into the mounting hole.
The power supply unit 20 is inserted into the mounting hole 501 with the wires 31, such as the wires for receiving power from a commercial power source and the signal wires, inserted into the terminal block 20. The worker rotates the power supply unit 20 away from the lighting fixture 10 and inserts the lighting fixture 1 into the mounting hole 501. The state of being rotated away is, for example, a state in which the power supply unit 20 protrudes in a direction substantially perpendicular to the lighting fixture 10. At this time, the worker can hold both the lighting fixture 10 and the power supply unit 20 with one hand. The power supply unit 20 can hold the rotation axis 39 together with the heat sink 100 because the part where the power supply unit 20 is connected to the heat sink 100 serves as the rotation axis 39, and the power supply unit 20 can be inserted into the mounting hole at a predetermined angle. The power supply unit 20 forms a gripping space 32 ((b) of FIG. 19 ) between the inclined portion 24c and the lighting fixture 10, in which the lighting fixture 10 can be gripped. The worker can adjust the angle of the power supply unit 20 and hold it by inserting a finger into the gripping space 32 between the inclined portion 24c and the heat sink 100. The power supply unit 20 forms a gripping space 32 (FIG. 19(b)) between the inclined portion 24c and the lighting fixture 10 in which the lighting fixture 10 can be gripped. The worker can hold the lighting fixture 10 and the power supply unit 20 with one hand. If the axis of rotation 39 is away from the heat sink, the worker must hold the heat sink with one hand and the power supply unit with the other hand.

Figure 19 (c) shows the lighting fixture 10 inserted into the mounting hole 501, with the mounting spring 400 hooked onto the edge of the mounting hole 501. At this time, the power supply unit 20 rotates as the lighting fixture 10 is inserted.

Figure 19 (d) shows the state in which the lighting fixture 10 is inserted into the mounting hole 501 and the lighting device 1 is attached to the mounting portion 500. The lighting fixture 10 has a frame portion 300 fixed to the mounting hole 501 by a mounting spring 400. The heat sink 100 provided with the light source portion 200 is attached to the cover portion 230. The cover portion 230 to which the heat sink 100 is attached is fixed to the frame portion 300 so as to rest on the frame portion 300. The power supply unit 20 is installed with one end engaged with the heat sink 100 and the other end abutting the mounting portion 500.

At this time, the other end of the power supply unit 20 has the cover side portion 24b protruding beyond the terminal block 22, so that a space can be provided between the terminal block 22 and the mounting portion 500 in which the electric wire 31 can be placed. Providing this space can prevent the electric wire 31 from being pinched between the terminal block 22 and the mounting portion 500 and being damaged. In addition, when a rigid electric wire 31 is used, it can prevent the lighting fixture 10 and the power supply unit 20 from being pressed and tilted by the elastic force of the electric wire 31 (such as the restoring force caused by bending the electric wire).

As shown in FIG. 19, the power supply device 20 is rotatably attached to the lighting fixture 10 attached to the mounting portion 500, and includes a case 25 having a top plate 23aa, a lighting circuit board 21 which is a lighting device for lighting the lighting fixture 10, and a terminal block 22 which supplies power to the lighting circuit board 21. The case 25 has a plate-shaped inclined portion 24c which is inclined toward the lighting fixture 10 and faces the lighting fixture 10 when the top plate 23aa is horizontal along the horizontal direction 502 ((d) of FIG. 19) of the lighting fixture 10 in a state where the lighting fixture 10 is attached to the mounting portion 500. Also, as shown in FIG. 2 and (d) of FIG. 19, the terminal block 22 is disposed on the side of the end 34 of the imaginary radius 33 when the case 25 rotates. The case 25 has a cover side portion 24b which forms a side surface extending beyond the terminal block 22 from the inclined portion 24c toward the terminal block 22.

***Effects of the Heat Sink 100 of the First Embodiment***
(1) In the first embodiment, since fin portion 120 of heat sink 100 is formed from fin main portion 121 and fin branch portion 122, the surface area of each fin can be increased.
This improves heat dissipation.
(2) Furthermore, since the surface area of each fin unit is increased, the number of fin portions 120 that are installed can be reduced, and therefore, spaces can be provided between adjacent fins through which air can escape.
(3) Furthermore, since the fin portion 120 is formed from the fin main portion 121 and the fin branch portions 122, these portions can reinforce each other, so that the heat sink 100 can be formed by press molding.
The press forming is performed, for example, by cold forging.
By forming the heat sink 100 by cold forging, the cost of molds can be reduced compared to injection molding, and a material with a high aluminum content can be used, so that a heat sink with good heat dissipation efficiency can be formed.
(4) Furthermore, since the heat sink 100 has the cylindrical portion 113 formed on the rear surface side of the light source unit 200 , the cylindrical portion 113 can absorb heat from the light source unit 200 .
(5) Furthermore, since the fin portion 120 is connected to the cylindrical portion 113, the heat absorbed by the cylindrical portion 113 can be efficiently dissipated to the atmosphere.

***Effects of Cover Section 230 of First Embodiment***
(1) In the first embodiment, the heat sink 100 includes the cover portion 230 having the hook portion 235 and the claw portion 236 . This makes it easy to attach and detach the frame portion 300 to the cover portion 230 .
(2) Furthermore, by using the cover portion 230, which serves as a connection portion connecting the frame portion 300 to the heat sink 100, the heat sink 100 and the frame portion 300 can be easily modified to suit the required light source output or light distribution of the light source.
(3) Furthermore, since the hook portion 235 and the claw portion 236 are integrally formed on the cover portion 230, the frame portion 300 can be fixed by the cover portion 230 alone without the need for fasteners such as screws, thereby reducing the number of parts.
(4) Furthermore, since the claw portion 236 is shaped to protrude so as to be inserted into the first hole 350 of the frame portion 300, a directional property is created regarding the installation of the frame portion 300, and therefore, it is possible to prevent the frame portion 300 from being installed in an incorrect state on the cover portion 230.
Furthermore, even if an impact is applied to the frame portion 300 (for example, during construction), since the claw portion 236 has a protruding shape that allows it to be inserted into the first hole 350, the claw portion 236 is less likely to be elastically deformed by the impact and is less likely to come out of the first hole 350.
(5) Also, since the claws 236 are formed in a protruding shape so as to be inserted into the first holes 350 of the frame 300, the protruding shape does not require dimensional control as compared to a case in which the claws are formed in a spring shape, improving ease of assembly. Since the frame 300 is held by the cover 230 alone, assembly is possible even if there is an assembly tolerance when assembling the parts.
Furthermore, by integrating the claw portion 236 with the cover portion 230, the number of assembly steps can be reduced and forgetting to attach a part can be prevented.
(6) Furthermore, the cover portion 230 has a frame receiving portion 237 that is placed on the end of the frame portion 300. Therefore, even if the hook portion 235 and the claw portion 236 are disengaged from the frame portion 300 due to an impact, the frame receiving portion 237 is placed on the frame portion 300, thereby preventing the heat sink 100 from falling.
(7) Furthermore, since the cover portion 230 and the frame portion 300 are made of a resin material, the generation of creaking noises and damage to parts due to thermal expansion and contraction can be suppressed.

***Effects of Power Supply Device 20 of First Embodiment***
In the first embodiment, the power supply device 20 has the lighting circuit board 21 housed in the case (case body 23, case lid 24) and the case 25 is provided with the inclined portion 24c, so that the power supply device 20 can rotate without interfering with the lighting fixture 10 with the rotation axis 39 provided inside the heat sink 100. In other words, the power supply device 20 does not need to be provided at a position distant from the lighting fixture 10, and therefore the lighting fixture 1 can be made smaller in size.
Fig. 20 shows a lighting fixture with a higher frame part 300A and a higher overall height H of the lighting fixture 10 compared to the lighting fixture 10 in Fig. 19. The power supply unit 20 has an inclined part 24c and can rotate without interfering with the lighting fixture 10, so that the power supply unit 20 can be used even in a lighting fixture with a higher height H, like the lighting fixture in Fig. 20.

<Modification 1>
Fig. 21 shows a modified example of the cover part 230. Fig. 21 shows a configuration in which the cover part 230 has a wireless function. The cover part 230 has a wire antenna 401 disposed on the front side and a wireless board 402 housed on the back side. As shown in Fig. 21, by housing the wire antenna 401 and the wireless board 402 in the cover part 230, it is not necessary to provide an opening in the frame part 300 so as to enable wireless communication. Therefore, since it is not necessary to prepare a frame part for wireless communication, it is possible to suppress an increase in the variations of the frame part.

<Modification 2>
(Heat sink 100a)
22, 23, and 24 show a heat sink 100a which is a modified example of the heat sink 100. FIG.
FIG. 22 is a perspective view of the heat sink 100a.
FIG. 23 is a plan view of the heat sink 100a.
FIG. 24 is a partially enlarged view of FIG.
The heat sink 100a has a base portion 110a. The heat sink 100a is different from the heat sink 100 in the following points (1) and (2).
(1) The heat sink 100a has a base portion 110a.
(2) The shape of the end fins 124 of the heat sink 100a is different from the shape of the end fins 123 of the heat sink 100. The multiple end fins 124 branch off at a second branch point 126b. The end fins 124 are composed of a first end fin 124a and a second end fin 124b. The first end fin 124a is bent at a second bend point 125b, which is the connection point with the second end fin 124b. In addition, the second end fins 124b that share the same fin branch point 122 are arranged opposite each other.

The heat sink 100a includes a plurality of fins 120 and a base portion 110a that protrudes from the base portion 110 at a position facing the light source portion 200 with the base portion 110 in between. As shown in FIG. 23, a portion of each fin portion 120 rises from the base portion 110a, and the remaining portion rises from the base portion 110.

The fin section 120 has a fin main section 121 and multiple fin branch sections 122. In FIG. 23, three fin branch sections 122 are branched, but four or more may be branched. The multiple fin branch sections 122 branch at a first branch point 126a. The two fin branch sections 122 are bent at a first bend point 125a. In each fin section 120, the fin main section 121 is a plate-shaped section rising from the base section 110a and has one side section 121a along the rising direction 120a and the other side section 121b along the rising direction 120a. As shown in FIG. 23, the multiple fin branch sections 122 branch from the other side section 121b of the fin main section 121 and extend away from each other as they move from the one side section 121a toward the other side section 121b, and at least a portion of the rising section rises from the base section 110a.

The heat sink 100a has a base portion 110a that protrudes from the fin arrangement surface 112 in a cylindrical shape at least at a portion facing the light emitting portion 210. The base portion 110a thickens the portion facing the light emitting portion 210, so that heat from the back surface of the light emitting portion 210 can be absorbed efficiently. In other words, in the case of the tube portion 113, the portion that stands as the side of the tube portion 113 is partially thick, whereas in the case of the pedestal shape, the entire pedestal shape is thick, so that the pedestal shape can absorb heat more uniformly than the cylindrical tube portion 113. In addition, in a plan view, this base portion 110a is provided with not only the fin main portion of the fin portion 120, but also at least a portion of the fin branch portion 122. In this way, by providing the fin portion 120, the number of points where the base portion 110a and the fin portion 120 are connected can be increased, and the heat absorbed by the base portion 110a can be efficiently transferred to the fin portion 120, improving heat dissipation efficiency.

As shown in FIG. 24, the heat sink 100a is provided such that the fin branches 122 are spaced apart from each other as they move from the center to the outside. In other words, the fin branches 122 are provided to protrude in an oblique direction, so that the distance L2 between adjacent fin sections 120 can be secured while securing the length L1 in the figure, making it difficult for heat to build up and improving heat dissipation. If the fin branches 122 are provided perpendicular to the fin main section, either the distance L1 or the distance L2 will be shortened. If the distance L1 is shortened, heat will be difficult to build up within the fin branches 122 and escape, and if the distance L2 is shortened, heat will be difficult to build up between adjacent fin sections 120 and escape.

Figure 25 shows an example of the relationship between aluminum purity and heat dissipation performance depending on the molding method of the heat sink. As shown in Figure 25, heat dissipation performance can be improved by molding the heat sink by pressing.

In the heat sink 100a, the pedestal portion 110a and the base portion 110, and the multiple fin portions 120 are integrally formed by forging. In the heat sink 100, the base portion 110 and the multiple fin portions 120 are also integrally formed by forging. In the heat sink 100, the base portion 110 and the fin portions 120 are also integrally formed from a material containing aluminum. Similarly, in the heat sink 100a, the pedestal portion 110a and the base portion 110, and the multiple fin portions 120 are also integrally formed from a material containing aluminum.

The shape of the tube portion 113 of the heat sink may be cylindrical, or may be a tube with a polygonal cross section. It may also be a shape that does not form a tube portion.

1 Lighting device, 10 Lighting fixture, 20 Power supply device, 21 Lighting circuit board, 22 Terminal block, 22a Power supply terminal block, 22b Dimming terminal block, 23 Case main body, 23a Bottom surface of main body, 23aa First plate portion, 23ab Second plate portion, 23b Side surface of main body, 23c Arm portion, 24 Case lid portion, 24a Bottom surface of lid, 24b Side surface of lid, 24c Sloping portion, 25 Case, 31 Wire, 32 Gripping space, 33 Virtual radius, 34 End portion, 39 Rotation axis, 100 Heat sink, 100a Heat sink, 110a Pedestal portion, 110 Base portion, 111 Light source mounting surface, 112 Fin arrangement surface, 113 Tube portion, 120 Fin portion, 120a Rising direction, 121 Fin main portion, 121a, 121b Side portion, 122 Fin branch portion, 122a Inner surface of branch portion, 123 End fin, 124 End fin, 125 Bending portion, 125a First bending portion, 125b Second bending portion, 126a First branch portion, 126b Second branch portion, 130 Power supply holding portion, 131 Holding hole, 140 Cord holding portion, 150 Wire cover portion, 151 Power supply control portion, 200 Light source portion, 210 Light emitting portion, 211 Light emitting element, 212 Board, 220 Socket portion, 221 Socket front portion, 222 Socket rear portion, 223 Clip, 230 Cover portion, 231 Cover main body portion, 232 Cover opening, 233 Inner wall portion, 234 Outer wall portion, 235 Hook portion, 235a Protrusion portion, 236 Claw portion, 237 Frame receiving portion, 238 Light distribution control section, 300, 300A frame section, 310 flange section, 320 rising section, 350 first hole, 351 first hole forming section, 360 second hole, 361 second hole forming section, 370 inclined section, 371 opening, 400 mounting spring, 401 wire antenna, 402 wireless board, 500 mounting section, 501 mounting hole, 502 horizontal direction.

Claims (8)

a base portion on which a light source portion is attached, the base portion having a cord holding portion rising from the base portion and accommodating an electric wire connecting the light source portion and a power supply device, the base portion also having a power supply holding portion formed of a pair of a first protrusion rising from the base portion and to which the power supply device is attached, and a second protrusion rising from the base portion separately from the first protrusion and to which the power supply device is attached, the power supply holding portion being disposed between the first protrusion and the second protrusion ;
a hollow cylindrical portion rising from the base portion and having a cross-sectional shape that is polygonal with the rising direction as a normal line;
a plurality of fin portions arranged such that the base portion is located between the fin portions and the light source portion;
Each fin portion is provided with
a fin main portion having a plate shape rising from the base portion and having one side portion along a rising direction and the other side portion along the rising direction, the one side portion being connected to a side line appearing on a side surface of the cylindrical portion along the rising direction of the cylindrical portion by a corner of the polygon;
a plurality of fin branch portions branching off from the other side of the fin main portion and extending away from each other as they move from the one side toward the other side. a base portion on which a light source portion is attached, the base portion having a cord holding portion rising from the base portion and accommodating an electric wire connecting the light source portion and a power supply device, the base portion also having a power supply holding portion formed of a pair of a first protrusion rising from the base portion and to which the power supply device is attached, and a second protrusion rising from the base portion separately from the first protrusion and to which the power supply device is attached, the power supply holding portion being disposed between the first protrusion and the second protrusion ;
a pedestal portion protruding from the base portion at a position facing the light source portion with the base portion therebetween;
a hollow cylindrical portion rising from the base portion and having a cross-sectional shape that is polygonal with the rising direction as a normal line;
A plurality of fin portions;
Equipped with
Each fin part is
A part of the rising portion rises from the pedestal portion, and the remaining part of the rising portion rises from the base portion,
Each fin part is
A heat sink having a plate-shaped fin main portion rising from the base portion and having one side portion along the rising direction and the other side portion along the rising direction, the one side portion being connected to a side line that appears on the side of the cylindrical portion along the rising direction of the cylindrical portion by a corner of the polygon. 3. The heat sink according to claim 2, further comprising a plurality of fin branch portions that branch off from the other side of the fin main portion, extend away from each other as they extend from the one side toward the other side, and at least a portion of the raised portion rises up from the base portion. The fin portion further includes:
The heat sink according to claim 1 or 3, comprising a plurality of end fins branching off from an end of at least one of the fin branches in an extending direction thereof. The heat sink according to claim 1 , wherein the base portion and the plurality of fin portions are integrally formed by forging. The heat sink according to claim 1 , wherein the base portion and the fin portion are integrally formed from a material containing aluminum. A heat sink according to any one of claims 1 to 6 ;
a light source unit attached to the heat sink;
A power supply device that supplies power to the light source unit;
A lighting device comprising: A heat sink according to claim 1 or 2;
a light source unit attached to the heat sink;
A power supply device that supplies power to the light source unit;
Equipped with
The heat sink is
The power supply is attached to the
The light source unit includes:
The temperature T with respect to the distance L from the power supply device to which power is being supplied is expressed by a function f of T=f(L), and decreases linearly as the distance L increases, transitioning to a transition range in which the temperature transitions to a saturated state, and then reaching the saturated state through the transition range.
The power supply device is
A lighting device attached to the heat sink at a location within the transition range.

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