JP7501074B2 - lighting equipment - Google Patents

Description

This disclosure relates to a lighting fixture equipped with a heat sink.

Conventionally, some lighting fixtures use heat sinks to dissipate heat from the light source.

For example, some lighting fixtures use a heat sink formed by combining a base part made of a metal plate with heat dissipation fins formed by bending the metal plate. (See, for example, Patent Document 1.)

JP 2015-162342 A

However, the heat dissipation fins of this lighting fixture are fixed to the base on one side but not on the other side. Therefore, when the lighting fixture is subjected to an external force such as vibration, one side may move around the axis of rotation of the other side, which may damage the heat dissipation fins.

Therefore, this disclosure has been made to solve the above problems, and aims to provide a lighting fixture that reduces damage to the heat dissipation fins.

The lighting device of the present disclosure comprises a light-emitting board having light-emitting elements mounted on a board, a rectangular base portion to which the light-emitting board is attached , a heat sink having fin portions protruding from the base portion, a rectangular top plate portion arranged to face the protruding end portions of the fin portions, a fin protection portion held between the fin portions and the top plate portion , and connection portions fixed to the four side edges of the top plate portion and connecting the top plate portion to the base portion while pressing the fin protection portion .

The lighting fixture disclosed herein is capable of suppressing damage to the heat dissipation fins.

1 is a perspective view of a lighting fixture according to a first embodiment. FIG. 2 is an exploded perspective view of the lighting fixture according to the first embodiment. FIG. 2 is an exploded perspective view of the heat sink according to the first embodiment. FIG. 2 is a perspective view of a heat dissipation fin according to the first embodiment. 2 is a cross-sectional view of the lighting device according to the first embodiment taken along line AA. FIG. FIG. 11 is an exploded perspective view of a lighting device according to a second embodiment. FIG. 11 is a perspective view of a fin protection part in the second embodiment. FIG. 11 is a plan view of a heat sink in a second embodiment. FIG. 11 is a reference cross-sectional view of a lighting device in embodiment 2. FIG. 11 is a perspective view of a heat sink with a fin protection portion attached in embodiment 3. FIG. 11 is a perspective view of a heat sink according to a third embodiment. FIG. 13 is a perspective view of a heat dissipation fin according to a third embodiment. FIG. 13 is a development view of a heat dissipation fin in the third embodiment. FIG. 13 is a perspective view of a fin protection part in the third embodiment.

Embodiment 1.
The present disclosure relates to a lighting fixture that suppresses damage to heat dissipation fins.
Hereinafter, a lighting fixture 1 that is attached to a mounting portion such as a ceiling will be described as an embodiment of the present disclosure.
In the following description, terms indicating directions are used as appropriate, but these terms are for the purpose of explanation and do not limit the lighting fixture. Examples of terms indicating directions include "up,""down,""right,""left,""front," and "rear." In addition, in each of the drawings described below, the Z axis indicates the up-down direction, the X axis indicates the left-right direction, i.e., the horizontal direction, and the Y axis indicates the front-rear direction, i.e., the depth direction. The X axis, Y axis, and Z axis are perpendicular to each other, the X axis and the Y axis are horizontal, and the Z axis is vertical.

The configuration of each part of the lighting fixture 1 will be described with reference to Figs. 1 to 5.
Fig. 1 is a perspective view of a lighting fixture 1. Fig. 2 is an exploded perspective view of the lighting fixture 1 shown in Fig. 1. Fig. 3 is an exploded perspective view of the heat sink 130 shown in Fig. 2. Fig. 4(a) is a perspective view of the heat dissipation fin 132 shown in Fig. 3. Fig. 4(b) is a reference perspective view in which one fin portion 1322 of the heat dissipation fin 132 shown in Fig. 4(a) has been removed. Fig. 5 is a cross-sectional view taken along the line A-A of the lighting fixture 1 shown in Fig. 1.

The lighting fixture 1 includes an arm 10 that is attached to the mounting portion, and a light source unit 100 that is held by the arm 10.

The arm 10 is connected to the light source unit 100 and fixes the light source unit 100 to a mounting portion. The arm 10 is disposed so as to sandwich the light source unit 100 in the lateral direction X.
The arm 10 has an arm fixing portion 11 that is fixed to the mounting portion, an arm main portion 12 that connects to the light source unit, and an arm protrusion portion 13 that holds the light source unit 100 on the downward direction Z2 side, and is formed of a strong metal material such as iron or stainless steel.

The arm fixing portion 11 is formed with a mounting hole 14 for fixing to a mounting portion with a fastener such as a hanging bolt.
The arm main part 12 is connected to the light source unit 100 by a fixing means such as a screw. The arm main part 12 is formed to be longer than the light source unit 100 in the vertical direction Z, and abuts and holds the light source unit 100 over the entire length in the vertical direction Z.
Therefore, when an external load such as vibration is applied to the light source unit 100, the light source unit 100 can distribute the load in the vertical direction Z, and the effect of the load on the light source unit 100 can be suppressed.
The arm protrusion 13 protrudes in the lateral direction X from the downward direction Z2 side of the arm main part 12, and holds the light source unit 100 by embracing it from the downward direction Z2 side. Since the arm 10 has the arm protrusion 13, even if the fixing means connecting the arm main part 12 and the light source unit 100 becomes detached, the light source unit 100 can be supported on the downward direction Z2 side to prevent it from falling.

The light source unit 100 includes a light source section 110, a cover section 120, a heat sink 130, a connecting section 140, a second column section 150, a reinforcing section 160, a fin protection section 170, a top plate section 180, and a power supply section 190.

The light source unit 110 includes a light emitting substrate 111 having a plurality of light emitting elements 1111 mounted on a substrate 1112 as a light source, and a lens unit 112 attached to cover the light emitting substrate 111 and controlling the light from the light emitting elements 1111 to a predetermined light distribution.

The cover section 120 is made of a transparent material and serves to protect the light source section 110 .
The cover unit 120 includes a cover 121 attached to the heat sink 130 so as to cover the light source unit 110 , and a cover packing 122 sandwiched between the cover 121 and the heat sink 130 .
The cover 121 has a box-shaped main cover 1211 with one side open, and a cover flange 1212 provided so as to protrude from the edge of the opening of the main cover 1211 .
The cover packing 122 has an opening in the center and is disposed so as to be pressed between the cover flange 1212 and the heat sink 130 .

The light source unit 110 is attached to the heat sink 130. The heat sink 130 transfers heat generated when the light source unit 110 emits light, and dissipates the transferred heat.
The heat sink 130 has a base portion 131 and heat dissipation fins 132. The base portion 131 and the heat dissipation fins 132 of the heat sink 130 are formed by processing a plate-shaped metal member. The metal member is, for example, iron, stainless steel, or aluminum, and by using aluminum, it is possible to make the material lighter than iron or stainless steel and improve heat dissipation properties.

The light source unit 110 is attached to the base unit 131. The base unit 131 is made of a plate-like metal member formed into a rectangular shape.
The base portion 131 has a plate-like surface serving as a light source attachment portion 1311 that holds the light source portion 110. The light source attachment portion 1311 is attached so as to abut against the surface of the substrate 1112 on which the light emitting element 1111 is not mounted.
The base portion 131 has the other plate-like surface, and the surface of the base portion 131 opposite the light source attachment portion 1311 is a fin attachment portion 1312 to which the heat dissipation fins 132 are attached.

The heat dissipation fins 132 are configured to dissipate heat transmitted from the light source unit 110 via the base portion 131 .
A plurality of heat dissipation fins 132 are disposed on a fin attachment portion 1312 of the base portion 131, and are provided so as to face the light source portion 110 across the base portion 131. The plurality of heat dissipation fins 132 are radially disposed on the base portion 131 at intervals from each other.

The heat dissipation fin 132 is formed by bending a plate-shaped metal member, and includes a fin fixing portion 1321 that is fixed to the fin attachment portion 1312 , and a fin portion 1322 that is provided to stand upright from the fin fixing portion 1321 .
The fin fixing portion 1321 has a trapezoidal shape, and is fixed to the fin attachment portion 1312 by fixing means such as screws or crimping.
The fin portion 1322 is provided so as to protrude from each of the opposing sides of the fin fixing portion 1321 in the upward direction Z1 which is approximately perpendicular to the fin fixing portion 1321. The fin portion 1322 is formed in a substantially rectangular shape, and a fin tip portion 1323, which is the side opposite the fin fixing portion 1321, is provided so as to face the top plate portion 180 .
The heat dissipation fins 132 are disposed such that the fin portions 1322 protrude from the base portion 131 when the fin fixing portion 1321 is fixed to the fin attachment portion 1312 .
In this embodiment, the heat dissipation fins 132 are made of a metal plate bent into a U-shape, but may be made of a metal plate bent into an L-shape.

The heat sink 130 has a plurality of fins 1322 formed radially around the center of the fin attachment portion 1312. No heat dissipation fins 132 are arranged on the center of the fin attachment portion 1312 , and no fins 1322 are arranged on the upward Z1 side of this center.
The multiple fin portions 1322 are arranged at intervals from adjacent fin portions 1322. The multiple fin portions 1322 are arranged at intervals from each of the adjacent fin portions 1322 such that the fin portions 1322 facing each other across the radial center and the plate-like surfaces of the fin portions 1322 face each other in the horizontal direction XY.

The connecting portion 140 is a rigid member of the light source unit 100, and holds the heat sink 130. The connecting portion 140 is disposed in a pair on opposing side surfaces of the heat sink 130 in the lateral direction X. The arm 10 is attached to the connecting portion 140.
The connecting portion 140 has a main connecting portion 141, a top plate-side protruding portion 142, and a base-side protruding portion 143. It is made of a strong metal material such as iron or stainless steel.

The connecting main portion 141 has a rectangular plate shape and includes a connecting opening 1411 and a pillar portion 1412 .
The connecting opening 1411 is provided so as not to block the heat dissipation from the heat dissipation fins 132 and so as not to block the flow of air in and out of the heat sink 130 .
The pillar portion 1412 is provided with a connection hole 14121 for connection to the arm 10 with a fixing means such as a screw.

The top plate side protrusion 142 is provided to protrude in the lateral direction X from the side edge of the main connection part 141 on the upward direction Z1 side.
The top plate portion 180 is placed on the top plate side protrusion portion 142 from the upward direction Z1 side, and the top plate portion 180 is fixed thereto by a fixing means such as a screw.
The connecting portion 140 is formed so that, when the heat sink 130 is attached, the length L1 (shown in Figure 5) from the base portion 131 to the top plate side protrusion portion 142 is the same as the length L2 (shown in Figure 5) from the base portion 131 to the fin tip portion 1323.

The base-side protruding portion 143 is provided so as to protrude in the lateral direction X from the side edge of the main connection portion 141 on the downward direction Z2 side.
The base side protrusion 143 is provided so as to cover the cover flange 1212 of the cover part 120 from the downward direction Z2 side, and holds the cover part 120 .
The base side protrusion 143 is connected to the base portion 131 via the cover flange 1212 of the cover portion 120 by fixing means such as a screw, and the heat sink 130 is held by the connecting portion 140.

The second column portion 150 connects the heat sink 130 and the top plate portion 180 in the depth direction Y. The second column portion 150 is disposed between the base portion 131 and the top plate portion 180, and can reduce the influence of loads such as external vibrations on the light source unit 100 in the depth direction Y.
The second column portion 150 has a column main portion 151, a second top plate side protruding portion 152, and a second base side protruding portion 153, and is formed from a strong metal material such as iron or stainless steel.
The second tabletop-side protrusion 152 is provided to protrude from the side edge on the upward Z1 side of the column main part 151 toward the depth direction Y. The tabletop part 180 is placed on the second tabletop-side protrusion 152 from the upward Z1 side, and the tabletop part 180 is fixed by a fixing means such as a screw.
The second base-side protrusion 153 is provided to protrude from the side edge on the downward direction Z2 side of the column main part 151 toward the depth direction Y. The second base-side protrusion 153 is fixed to the base part 131 by fixing means such as a screw.
The second column portion 150 is formed so that, when installed, the length L3 (shown in Figure 2) from the base portion 131 to the second top plate side protrusion portion 152 is the same as the length L2 (shown in Figure 5) from the base portion 131 to the fin tip portion 1323.

The reinforcing portion 160 has a U-shaped cross section and is attached so as to cover the side of the base portion 131 of the heat sink 130. The reinforcing portion 160 is disposed on both opposing sides of the heat sink 130 in the depth direction Y.
The reinforcing part 160 is attached to the base part 131 so as to sandwich the cover flange part 1212, the cover packing 122, and the base part 131. The reinforcing part 160 is fixed to the base part 131 together with the cover part 120 by a fixing means such as a screw.
The reinforcing portion 160 has a sloped portion 143 at its tip, making it easier to insert.
By attaching the reinforcing portion 160 to the base portion 131, the rigidity of the base portion 131 is improved, and the rigidity of the heat sink 130 is also improved. The reinforcing portion 160 has a function and effect similar to that of a beam, and suppresses deflection.

The fin protection portion 170 is formed of an elastic member and suppresses movement of the fin tip portion 1323. The fin protection portion 170 is disposed so as to cover the base heat dissipation fins 132 from the upward direction Z1 side, and is sandwiched and held between the fin tip portion 1323 and the top plate portion 180.
The elastic member forming fin protection portion 170 is, for example, foamed silicone.

The top plate 180 is a plate-like metal member formed to have the same shape as the base 131, and is fixed to the connecting portion 140 so as to press the fin protection portion 170 from the upward Z1 side. A power supply portion 190 is fixed to the surface of the top plate 180 opposite to the surface facing the heat dissipation fins 132.

The top plate portion 180 is placed on and fixed to the top plate side protrusion 142 of the connecting portion 140 from the upward Z1 side. At this time, the length L1 (shown in FIG. 5) from the base portion 131 to the top plate side protrusion 142 and the length L2 (shown in FIG. 5) from the base portion 131 to the fin tip portion 1323 are formed to be the same, so that the top plate portion 180 presses the fin protection portion 170 toward the fin tip portion 1323. Therefore, the top plate portion 180 can sandwich the fin protection portion 170 between the fin tip portion 1323 and the top plate portion 180.
The top plate 180 is also fixed to the second column 150 by fixing means such as screws at four points, namely, left and right in the lateral direction X and front and rear in the depth direction Y. Therefore, the top plate 180 can evenly press the fin protection part 170. The connecting part 140 and the second column 150 are connection parts for fixing the top plate 180 to the heat sink 130.

The power supply unit 190 receives power from an external source and supplies the power to the light emitting substrate 111 for lighting.
The power supply unit 190 includes a lighting circuit unit 191 that converts external power into power for lighting the light emitting board 111, a harness 192 that connects the lighting circuit unit 191 and the light emitting board 111 and supplies power to the light emitting board 111, and a case unit 193 that is attached to the top plate unit 180 so as to cover the lighting circuit unit 191. The lighting circuit unit 191 has a power supply board 194 on which circuit components are mounted. The harness 192 is disposed between the multiple heat dissipation fins 132.

Next, the effect of the fin protection portion 170 will be described.
The fin protection portion 170 is pressed against the top plate portion 180 to press and hold the fin tip portions 1323 of the heat dissipation fins 132 .
If the fin tip portion 1323 were not held, when the lighting device 1 was subjected to a load such as external vibration, the fin portion 1322 would move so that the fin tip portion 1323 would rotate around the fin fixing portion 1321 as an axis. The fin portion 1322 would be deformed and damaged as the fin tip portion 1323 rotates. In addition, the fin tip portion 1323 would come into contact with the harness 192, causing the harness 192 to be damaged.
However, by holding the fin tip portion 1323 so as to press it with the fin protection portion 170, it is possible to restrict the movement of the fin tip portion 1323 and suppress damage to the fin portion 1322. Furthermore, by restricting the movement of the fin tip portion 1323, it is possible to suppress contact with the harness 192, and therefore it is possible to suppress damage to the harness 192.

The lighting fixture 1 of this embodiment includes a light emitting substrate 111 , a heat sink 130, a fin protection part 170, and a top plate part 180, and the heat sink 130 has a base part 131 to which the light emitting substrate 111 is attached, and a fin part 1322 protruding from the base part 131. In this lighting fixture 1, the fin protection part 170 is held by being sandwiched between the top plate part 180 and the end part on the side where the heat dissipation fins 132 protrude.
Thus, one end of the heat dissipating fin 132 is fixed to the base portion 131, and the other end is held by the fin protection portion 170 and the top plate portion 180, so that even if the lighting fixture 1 is subjected to an external load such as vibration, movement of the fin tip portion 1323 can be suppressed. Furthermore, by suppressing movement of the fin tip portion 1323, the load on the fin portion 1322 due to deformation caused by the movement can be suppressed, and damage to the heat dissipating fin 132 can be suppressed. Furthermore, since the fin protection portion 170 only needs to be clamped, an increase in the number of screws required for installation can be suppressed, making the installation work easier.

The lighting fixture 1 of this embodiment also has a connection portion for fixing the top plate portion 180 to the base portion 131, and the top plate portion 180 is fixed to the connection portion so as to press the fin protection portion 170. This makes it possible to hold the fin portion 1322 more firmly and to further suppress movement of the fin tip portion 1323.

Furthermore, in the lighting fixture 1 of the present embodiment, the fin protection portion 170 has elasticity. Therefore, even if the lengths L1 of the fin portions 1322 of the plurality of heat dissipation fins 132 are different when the sheet metal is processed, the fin protection portion 170 can be elastically deformed to apply pressure and can hold the fin tip portions 1323.
In addition, the elasticity of the fin protection portion 170 may be utilized to absorb the load on the fin tip portion 1323 .

In this embodiment, the top plate portion 180, the connecting portion 140, and the second column portion 150 are described as being separate components, but as long as the fin protection portion 170 can be pressed against the heat dissipation fins 132, any two or more of the top plate portion 180, the connecting portion 140, and the second column portion 150 may be integrated.

In addition, in this embodiment, the heat sink 130 is configured such that the heat dissipation fins 132 are radially arranged on the base portion 131. However, it is sufficient that the fin portion 1322 protrudes from the base portion 131, and the heat dissipation fins 132 may be arranged side by side in both the lateral direction X and the depth direction Y.

In addition, in this embodiment, the connecting portion 140 and the second pillar portion 150 are provided in pairs, and the top plate portion 180 is fixed at four points. However, as long as the fin protection portion 170 can be pressed by the top plate portion 180, two or three points may be used. Also, the fin protection portion 170 may be fixed at one point on the center side.

In addition, in the present embodiment, a shape in which one fin protection portion 170 covers multiple fin tip portions 1323 has been described, but a fin protection portion 170 may be provided separately for each of the multiple fin tip portions 1323. Furthermore, the fin protection portion 170 does not need to cover the entire length of the side of the fin portion 1322, and may cover only a portion of it.

In addition, in this embodiment, the lighting fixture 1 has been described as being attached to a mounting portion such as a ceiling, but it may also be used in a lighting fixture that is attached to a crane, etc., or in a lighting fixture that is attached so as to be embedded in an opening provided in a mounting portion .

Embodiment 2.
Next, a lighting fixture 200 according to a second embodiment will be described with reference to Figs. 6 to 9. Fig. 6 is an exploded perspective view of the lighting fixture 200. Fig. 7 is a perspective view of the fin protection part 220 shown in Fig. 6, viewed from the downward direction Z2. Fig. 8 is a plan view of the heat sink 130 shown in Fig. 6, viewed from the upward direction Z1. Fig. 9 is a reference cross-sectional view of the state in which the fin protection part 220 shown in Fig. 7 is attached to the heat sink 130. Note that the reference cross-sectional view shown in Fig. 9 is a cross-section of the lighting fixture 200 taken at the same location as A-A shown in Fig. 1.

Illumination device 200 of the present embodiment includes fin protection section 220 which is different from fin protection section 170 of embodiment 1. Fin protection section 220 restricts movement of fin section 1322 in horizontal directions XY.
In addition, items in the lighting fixture 200 of embodiment 2 that are not specifically described are the same as those in the lighting fixture 1 of embodiment 1, and the same functions and configurations will be described using the same symbols.

The lighting fixture 200 includes an arm 10 and a light source unit 210. The light source unit 210 includes a light source section 110, a cover section 120, a heat sink 130, a connecting section 140, a second column section 150, a reinforcing section 160, a top plate section 180, a power supply section 190, and a fin protection section 220.

The fin protection portion 220 is formed of a member having elasticity, and serves to restrict the movement of the fin tip portion 1323 in the horizontal directions XY.
The fin protection portion 220 is disposed so as to abut against the upward Z1 side of the fin portion 1322 , and has an insertion portion 221 and a flange portion 222 .
The elastic material forming fin protection portion 220 is, for example, foamed silicone.

The insertion portion 221 is inserted between the multiple fin portions 1322 from the upward direction Z1 side, and has a cylindrical insertion main body portion 2211 and an insertion inclined portion 2212 provided on the downward direction Z2 side of the insertion main body portion 2211.
The heat sink 130 has an area on the center side of the fin attachment portion 1312 where the heat dissipation fins 132 are not provided, and this area is area B surrounded by a dotted line in Fig. 7. On the upper Z1 side of this area B is area C where the fin portion 1322 is not provided.
Moreover, range B is provided in a circular shape with a radius of L3 centered on center D of the multiple radially arranged fin portions 1322, and range C is a space assuming a cylindrical shape with a radius of L3. Moreover, the distance between center end portion 1324 of fin portion 1322 and center D is length L3.
The insertion body 2211 is inserted into the range C from the upward direction Z1, and has a cylindrical shape with a radius of length L3. The insertion body 2211 is formed so that the insertion side surface 2211a comes into contact with the central end portion 1324 of the fin portion 1322 when inserted into the range C.
The insertion inclined portion 2212 is provided on the downward Z2 side of the insertion main body 2211, and is inclined so that its size in the horizontal direction XY decreases toward the downward Z2 side. The insertion portion 221 is inserted into the range C from the insertion inclined portion 2212, and the end of the insertion inclined portion 2212 on the downward Z2 side is narrowed, so that the insertion portion 221 can be easily inserted into the range C.

The flange portion 222 is provided on the upper direction Z1 side of the insertion portion 221, and is formed in a disk shape. The flange portion 222 is formed to have a radius larger than the radius L3 of the insertion body portion 2211.
The flange portion 222 is placed on the fin tip portion 1323 when the insertion portion 221 is inserted into the range C. By being placed on the fin tip portion 1323, the flange portion 222 can hold the insertion portion 221 on the upward direction Z1 side of the fin portion 1322.
When the top plate portion 180 is fixed to the connecting portion 140 and the second pillar portion 150 , the flange portion 222 is sandwiched and held between the top plate portion 180 and the fin tip portion 1323 .
Fin protection portion 220 is fixed to heat sink 130 by having flange portion 222 sandwiched and held between top plate portion 180 and fin tip portion 1323. Furthermore, fin protection portion 220 holds fin tip portion 1323 by having flange portion 222 pressed against top plate portion 180.

Next, the effect of the fin protection portion 220 will be described.
When the insertion portion 221 of the fin protection portion 220 is inserted into the range C, the insertion body portion 2211 abuts against the central end portion 1324 of the fin portion 1322. At this time, since the radius of the insertion body portion 2211 and the radius of the range C are formed to be the same length in the horizontal direction XY, the insertion body portion 2211 abuts against the central end portion 1324 so as to press it outward.
The fin protection part 220 abuts against the central end part 1324 so as to press it from the horizontal direction XY, thereby holding the upward direction Z1 side of the central end part 1324 and suppressing movement of the fin tip part 1323 due to load such as vibration. This makes it possible to suppress damage to the fin part 1322. Furthermore, by suppressing movement of the fin tip part 1323, it is possible to suppress contact with the harness 192, and therefore it is possible to suppress damage to the harness 192.

The lighting fixture 200 of this embodiment includes a base portion 131 to which the light source portion 110 is attached, a fin portion 1322 protruding from the base portion 131 in the upward direction Z1, a top plate portion 180 facing the end of the fin portion 1322 in the upward direction Z1, and a fin protection portion 220 that holds the top plate portion 180 side of the fin portion 1322, and has an insertion portion 221 that abuts against the fin portion 1322 from the horizontal direction XY that intersects with the direction in which the fin portion 1322 protrudes, thereby making it possible to suppress movement of the fin tip portion 1323 of the fin portion 1322. Thus, damage to the fin portion 1322 can be suppressed.

Furthermore, in lighting fixture 200 of the present embodiment, fin protection section 220 has flange section 222 that is sandwiched between fin tip section 1323 of fin section 1322 and top plate section 180, and flange section 222 is pressed against top plate section 180 to hold fin tip section 1323. Thus, fin protection section 220 holds the upward direction Z1 side of fin section 1322 from the upward direction Z1 side as well, and can prevent fin tip section 1323 from moving.

In addition, in the lighting fixture 200 of this embodiment, multiple fin portions 1322 are radially arranged at intervals on the base portion 131, and the insertion portion 221 is formed so that the length between adjacent fin portions 1322 is the same. Therefore, by inserting the fin protection portion 220 into the heat sink 130 from the upward direction Z1 side, the insertion portion 221 can protect the fin portions 1322 by pressing them, making it easy to install.

In addition, in the lighting fixture 200 of the present embodiment, the insertion portion 221 of the fin protection portion 220 has been described as being cylindrical, but any shape that can hold the central end portions 1324 of the multiple fin portions 1322 may be used, and the insertion portion 221 may be a polygonal column that abuts the central end portions 1324 on a flat surface, or may be a shape provided with a groove into which the central end portions 1324 fit. Furthermore, the multiple fin portions 1322 may have different lengths between the central end portions 1324 and the center D, and in that case, the fin protection portion 220 may be a shape that can hold the respective central end portions 1324.

Furthermore, in the above embodiment, lighting fixture 200 has been described as being configured so that the length of the radius of insertion body 2211 of fin protection portion 220 is the same as the radius of range C, but insertion body 2211 may be formed larger than range C so that it is inserted while being elastically deformed when inserted into range C. With this configuration, central end 1324 of fin portion 1322 can be pressed more firmly, and movement of fin tip 1323 can be more effectively suppressed.

In addition, in the lighting fixture 200 of this embodiment, the fin protection part 220 is configured to insert the insertion body part 2211 into range C, but the fin part 1322 may have a shape in which the plate-shaped surface of the fin part 1322 is inserted between adjacent fin parts 1322 that face each other. In this case, the length between adjacent fin parts 1322 that face each other and the length of the insertion body part 2211 are the same. With this configuration, the insertion body part 2211 can abut against each of the multiple fin parts 1322 by surface, and the movement of the fin tip part 1323 can be further suppressed.

In addition, the first and second embodiments of the present disclosure include a base portion 131 to which the light source portion 110 is attached, a fin portion 1322 protruding from the base portion 131 in the upward direction Z1, a top plate portion 180 facing the upper Z1 side end of the fin portion 1322, and fin protection portions 170, 220 holding the top plate portion 180 side of the fin portion 1322, and the fin protection portions 170, 220 holding the top plate portion 180 side of the fin portion 1322 can suppress movement of the fin tip portion 1323 of the fin portion 1322. Thus, damage to the fin portion 1322 can be suppressed.
Furthermore, the fin protection parts 170, 220 are disposed on the top plate part 180 side, between the fin attachment part 1312. Therefore, the air passing between the multiple fin parts 1322 is prevented from being blocked, and the fin parts 1322 can be held in place.

Note that embodiment 1 and embodiment 2 can be combined as appropriate. Also, parts of embodiment 1 and embodiment 2 can be extracted and combined. Furthermore, the present invention is not limited to embodiment 1 and embodiment 2, and can be modified as appropriate.

Embodiment 3.
Next, a description will be given of a lighting fixture 300 according to a third embodiment. The lighting fixture 300 includes a heat sink 310 and a fin protection portion 320 that are different from those in the first and second embodiments. The heat sink 310 will be described with reference to Figs. 10 to 14.
Fig. 10 is a perspective view of the heat sink 310 with the fin protection part 320 attached. Fig. 11 is a perspective view of the heat sink 310 shown in Fig. 10. Fig. 12 is a perspective view of the heat dissipation fin 312 shown in Fig. 11. Fig. 13 is a development view of the heat dissipation fin shown in Fig. 12, Fig. 13(a) is a side view showing the side of the fin part 3122, Fig. 13(b) is a side view seen from the center side of the base part 311, and Fig. 13(c) is a plan view seen from the downward direction Z2 side. Fig. 14 is a perspective view of the fin protection part 320 shown in Fig. 10.
In addition, items in the lighting fixture 300 of embodiment 3 that are not specifically described will be the same as those in the lighting fixture 1 of embodiment 1 and the lighting fixture 200 of embodiment 2, and the same functions and configurations will be described using the same symbols.

The heat sink 310 has a fin opening 3123 in the fin section 3122, and the fin protection section 320 is inserted into this fin opening 3123 to protect the heat dissipation fins 312.

The light source unit 110 is attached to the heat sink 310. The heat sink 310 transfers heat generated when the light source unit 110 emits light, and dissipates the transferred heat.
The heat sink 310 has a base portion 311 and heat dissipation fins 312. The base portion 311 and the heat dissipation fins 312 of the heat sink 310 are formed by processing a plate-shaped metal member. The metal member is, for example, iron, stainless steel, or aluminum, and by using aluminum, the weight can be reduced more than that of iron or stainless steel, and heat dissipation can be improved.

The light source unit 110 is attached to the base unit 311. The base unit 311 is a plate-like metal member formed into a rectangular shape.
The base portion 311 has a plate-like surface serving as a light source attachment portion 3111 that holds the light source portion 110. The light source attachment portion 3111 is attached so as to abut against the surface of the substrate 1112 on which the light emitting element 1111 is not mounted.
The base portion 311 has the other plate-like surface, and the surface of the base portion 311 opposite the light source mounting portion 3111 is a fin mounting portion 3112 to which the heat dissipation fins 312 are attached.

The heat dissipation fins 312 are provided to dissipate heat transmitted from the light source unit 110 via the base unit 311. The heat dissipation fins 312 are provided to face the light source unit 110 with the base unit 311 interposed therebetween.
The heat dissipation fin 312 is formed by bending a plate-shaped metal material into a U-shape, and includes a fin fixing portion 3121 fixed to the fin mounting portion 3112, and a fin portion 3122 arranged to stand upright from the fin fixing portion 3121.

A plurality of heat dissipation fins 312 are provided on the heat sink 310, and a plurality of fin portions 3122 are arranged radially around the center of the fin attachment portion 3112. No heat dissipation fins 312 are arranged on the center of the fin attachment portion 3112, and no fin portions 3122 are arranged on the upward Z1 side of this center.
The multiple fin portions 3122 are arranged at intervals from the adjacent fin portions 3122. The multiple fin portions 3122 are arranged at intervals from each of the adjacent fin portions 3122 such that the fin portions 3122 facing each other across the radial center and the plate-like surfaces of the fin portions 3122 face each other in the horizontal direction XY.

The fin fixing part 3121 has a trapezoidal shape and is fixed to the fin mounting part 3112 by a fixing means such as a screw or crimping. The fin fixing part 3121 is attached to the fin mounting part 3112 so as to be in surface contact.

The fin portion 3122 is provided so as to protrude from each of the opposing side edges of the fin fixing portion 3121 in the upward direction Z1 which is approximately perpendicular to the fin fixing portion 3121. The fin portion 3122 is formed in a substantially rectangular shape, and is provided with a fin opening portion 3123 which opens in the shape of a circular hole.
In addition, the side of the fin portion 3122 opposite the fin fixing portion 3121 is the fin tip portion 3124, and the side facing the radial center when the heat dissipation fin 312 is arranged radially on the base portion 311 is the fin central end portion 3125.
The fin opening 3123 is provided on the fin tip portion 3124 side, on the fin central end portion 3125 side.
The fin portion 3122 is disposed so as to protrude from the base portion 311 when the heat dissipation fins 312 are fixed to the fin attachment portion 3112 .
In this embodiment, the heat dissipation fins 312 are made of a metal plate bent into a U-shape, but may be made of a metal plate bent into an L-shape.

The fin protection part 320 is a linear member formed into a ring shape, and is inserted into the fin opening 3123 of the heat dissipation fin 312. The fin protection part 320 is made of an elastic member, for example, formed by bending an elastic linear stainless steel material into a ring shape.
The fin protection portion 320 is attached to the heat sink 310 by being inserted through a plurality of fin openings 3123 .
In addition, the fin protection part 320 may be formed in a ring shape with a notch provided in one part, and inserted into the multiple fin openings 3123 from one end of the notch, and the notch may be sealed after insertion into the multiple fin openings 3123.
Furthermore, fin protection portion 320 may be inserted into a plurality of fin openings 3123 in a linear state, and one end side and the other end side of the linear shape may be connected after being inserted into the plurality of fin openings 3123 .

By attaching the fin protection portion 320 to the heat sink 310 , the multiple fin portions 3122 are connected to be integrated via the fin protection portion 320 .
The multiple fin portions 3122 are attached to the heat sink 310 by inserting the fin protection portions 320 into the respective fin openings 3123 , and connect the multiple fin portions 3122 together.
The multiple fin portions 3122 can support and protect each other by being connected by the fin protection portion 320. For example, even if a load such as vibration is applied to any one of the multiple fin portions 3122, the other fin portions 3122 can support the fin portion 3122. Even if any one of the fin portions 3122 is damaged and comes off the base portion 311, the fin portion 3122 is supported by the other fin portions 3122 via the fin protection portion 320, and can be prevented from moving outside the lighting device 300.

The heat sink 310 has the fin opening 3123 provided on the fin tip 3124 side of the fin section 3122, so that the worker does not need to insert his/her fingers into the fin fixing section 3121 side when attaching the fin protection section 320, making the work easier. Also, the heat sink 310 has the fin opening 3123 provided on the fin center end 3125 side of the fin section 3122, so that the fin protection section 320 can be housed inside, and a design can be achieved that prevents the fin protection section 320 from being exposed to the outside.

Furthermore, since the fin protection portion 320 is formed from a wire material, it is possible to prevent the air passing between the multiple fin portions 3122 from being blocked, and to hold the fin portions 3122 .

The fin protection part 320 may be formed to a size that presses the fin center side end parts 3125 of the multiple fin openings 3123 toward the center of the base part 311. By forming the fin protection part 320 to press the fin center side end parts 3125 of the fin openings 3123 toward the center of the base part 311, the multiple heat dissipation fins 312 approach each other, and unintentional movement of the fin tip parts 3124 due to vibration or the like can be suppressed.

In addition, the heat sink 310 may have the fin openings 3123 of the fin portion 3122 provided on the side opposite the fin central end portion 3125. By providing the fin openings 3123 on the side opposite the fin central end portion 3125, the fin protection portion 320 is designed to be easily exposed to the outside, but it becomes easier to install and improves workability.

Note that the heat sink 310 may have the fin openings 312.3 of the fin portion 3122 provided on the fin fixing portion 3121 side. By providing the fin openings 312.3 on the fin fixing portion 3121 side, the worker must insert his/her finger, which reduces workability, but the fin portion 3122 can be supported on the fin fixing portion 3121 side, which is the base side of the fin portion 3122, and unintended movement of the fin tip portion 3124 can be further suppressed.

It should be noted that it is possible to appropriately combine the first, second, and third embodiments. For example, the fin protection unit 170 or 220 described in the first or second embodiment may be combined with the fin protection unit 320 of the third embodiment.
It is also possible to extract and combine parts of the first to third embodiments. Furthermore, the present invention is not limited to the first and second embodiments, and can be modified as appropriate.

1 Lighting fixture, 10 Arm, 11 Arm fixing portion, 12 Arm main portion, 13 Arm protrusion portion, 14 Mounting hole, 100 Light source unit, 110 Light source portion, 111 Light emitting substrate, 1111 Light emitting element, 1112 Substrate, 112 Lens portion, 1121 Lens, 120 Cover portion, 121 Cover, 1211 Main cover, 1212 Cover flange portion, 122 Cover gasket, 130 Heat sink, 131 Base portion, 1311 Light source mounting portion, 1312 Fin mounting portion, 132 Heat dissipation fin, 1321 Fin fixing portion, 1322 Fin portion, 1323 Fin tip portion, 1324 Center side end portion, 140 Connection portion, 141 Connection main portion, 1411 Connection opening, 1412 Pillar portion, 14121 Connection hole, 142 Top plate protrusion, 143 base side protrusion, 150 second pillar portion, 151 pillar main portion, 152 second top plate side protrusion, 153 second base side protrusion, 160 reinforcement portion, 170 fin protection portion, 180 top plate portion, 190 power supply portion, 191 lighting circuit, 192 harness, 193 case portion, 194 electric board, 200 lighting fixture, 210 light source unit, 220 fin protection portion, 221 insertion portion, 2211 insertion main body portion, 2212 insertion inclined portion, 222 flange portion, 300 lighting fixture, 310 heat sink, 311 base portion, 3111 light source attachment portion, 3112 fin attachment portion, 312 heat dissipation fin, 3121 fin fixing portion, 3122 fin portion, 3123 fin opening portion, 3124 Fin tip, 3125 fin center end, 320 fin protection part.

Claims (4)

a light emitting substrate on which a light emitting element is mounted;
a heat sink having a rectangular base portion to which the light emitting substrate is attached and a fin portion protruding from the base portion;
A top plate portion formed in a rectangular shape and arranged to face the protruding end portion of the fin portion;
a fin protection portion that is sandwiched and held between the fin portion and the top plate portion;
A lighting device comprising : a connection portion fixed to the four side edges of the top plate portion and connecting the top plate portion to the base portion while pressing the fin protection portion . The lighting fixture according to claim 1, wherein the fin protection portion has an insertion portion that abuts against the fin portion from a direction intersecting the direction in which the fin portion protrudes. The lighting fixture according to claim 1 , wherein the length of the connection portion from the base portion is the same as the length of the fin portion protruding from the base portion. 4. The lighting fixture according to claim 1, wherein the fin protection portion has elasticity.