Lighting fixtures

Abstract

To improve the heat dissipation performance of lighting fixtures. [Solution] The lighting fixture according to this embodiment comprises a light source unit 1, a plurality of heat dissipation fins 31, and a base plate 42 to which the light source unit 1 is attached to the upper surface and the plurality of heat dissipation fins 31 are attached to the lower surface. The plurality of heat dissipation fins 31 include a plurality of heat dissipation fins 31a included in group 3a and a plurality of heat dissipation fins 31b included in group 3b. In a plan view, the first direction, which is the extension direction of the heat dissipation fins 31a, is arranged to intersect with the second direction, which is the extension direction of the heat dissipation fins 31b.

Description

Technical Field

[0001] The present disclosure relates to lighting fixtures.

Background Art

[0002] Conventionally, so-called high-ceiling lighting fixtures that are installed in buildings with high ceilings such as gymnasiums and halls and illuminate the lighting space from above are known.

[0003] For example, in Patent Document 1, LEDs are attached to the lower surface side of the base, and a plurality of fins for radiating heat generated when the LEDs emit light are arranged on the upper surface side of the base.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, in Patent Document 1, a plurality of heat radiation fins (fins) are attached to the mounting plate (base) in a radial pattern. Therefore, when trying to arrange heat radiation fins at the central part of the mounting plate, the interval between adjacent heat radiation plates (the first fin and the second fin) becomes narrow, so it is difficult to arrange heat radiation fins near the central part of the mounting plate. Generally, since a light source unit such as an LED is often arranged at the central part of the mounting plate, if there are no heat radiation fins near the central part of the mounting plate, the heat radiation performance of the lighting fixture may deteriorate.

[0006] Therefore, an object of the present disclosure is to provide a lighting fixture with improved heat radiation performance.

Means for Solving the Problems

[0007] To achieve the above objective, a lighting fixture according to one embodiment of the present disclosure comprises a light source unit, a plurality of heat dissipation fins, and a mounting plate on which the light source unit is mounted on the upper surface and the plurality of heat dissipation fins are mounted on the lower surface, wherein the plurality of heat dissipation fins include a plurality of first heat dissipation fins included in a first group and a plurality of second heat dissipation fins included in a second group, and in a plan view, the first direction, which is the extension direction of the first heat dissipation fins, is arranged to intersect with the second direction, which is the extension direction of the second heat dissipation fins. [Effects of the Invention]

[0008] According to this disclosure, the heat dissipation performance of lighting fixtures can be improved. [Brief explanation of the drawing]

[0009] [Figure 1] A perspective view of the lighting fixture according to this embodiment, seen from above. [Figure 2] A perspective view of the lighting fixture according to this embodiment, seen from below. [Figure 3] A plan view of the heat dissipation section according to this embodiment, seen from above. [Figure 4] A perspective view showing the heat dissipation fins according to this embodiment. [Figure 5] Temperature distribution diagram of the base plate according to this embodiment. [Figure 6] A plan view from above of another example of the heat dissipation section according to this embodiment. [Figure 7] A plan view from above of another example of the heat dissipation section according to this embodiment. [Modes for carrying out the invention]

[0010] The embodiments of this disclosure will be described in detail below with reference to the drawings. The following description of preferred embodiments is essentially illustrative and is not intended to limit the invention, its applications, or its uses in any way.

[0011] The lighting fixture according to this embodiment will be described by taking, as an example, a lighting fixture for high ceilings. Note that the lighting fixture of this embodiment is not limited to a lighting fixture for high ceilings, and may be, for example, a lighting fixture such as a road lamp or a street lamp.

[0012] In the following description, the up-down, left-right, and front-back directions of the lighting fixture will be defined and described using the up-down, left-right, and front-back arrows shown in FIG. 1.

[0013] As shown in FIG. 1, the lighting fixture according to this embodiment includes a light source unit 1, a power supply unit 2, a heat dissipation unit 3, a holding unit 4, and an arm 6.

[0014] The power supply unit 2 supplies power to the light source unit 1.

[0015] The heat dissipation unit 3 dissipates heat from the light source unit 1 respectively.

[0016] The holding unit 4 holds the light source unit 1. The holding unit 4 has a top plate 41, a bottom plate 42 (mounting plate), a pair of first support portions 43, and a pair of second support portions 44. The light source unit 1 is attached to the lower surface of the bottom plate 42. The pair of first support portions 43 and the pair of second support portions 44 support the top plate 41 and the bottom plate 42 in a state where the upper surface of the bottom plate 42 faces the lower surface of the top plate 41.

[0017] The power supply unit 2 is attached to the upper surface of the top plate 41. The heat dissipation unit 3 is attached to the upper surface of the bottom plate 42.

[0018] (Light source unit) As shown in FIG. 2, the light source unit 1 has an LED (Light Emitting Diode) module corresponding to a light source, a cover 10, and a packing 11.

[0019] The LED module has, for example, a plurality of LEDs and a mounting substrate 12. Each LED is, for example, a packaged white LED that is well-known in the art. The mounting substrate 12 is composed of a rectangular flat resin substrate. The mounting substrate 12 is fixed to the lower surface of the bottom plate 42, for example, by screwing.

[0020] The plurality of LEDs are mounted side by side vertically and horizontally on the lower surface of the mounting substrate 12. Also, a receptacle connector is mounted on the lower surface of the mounting substrate 12. The receptacle connector is electrically connected to the electrodes (cathode and anode) of each LED via a conductor for wiring formed on the lower surface of the mounting substrate 12.

[0021] The cover 10 is attached to the holding portion 4 so as to cover the LED module. The cover 10 is formed of a synthetic resin material having translucency, such as polycarbonate resin.

[0022] The cover 10 has a main body portion 101 and a flange portion 102. The main body portion 101 is formed in a flat rectangular box shape having an opening (not shown) on the upper surface. The flange portion 102 is integrally formed with the main body portion 101 so as to protrude outward from the peripheral edge of the opening of the main body portion 101. That is, when the cover 10 is viewed from above, the flange portion 102 is formed in a rectangular frame shape. By screwing the flange portion 102 to the bottom plate 42, the cover 10 is attached to the holding portion 4.

[0023] The packing 11 is substantially the same shape as the flange portion 102 and is formed in a rectangular frame shape when viewed from above. The packing 11 is formed of, for example, a rubber material or a resin material. The packing 11 is interposed between the flange portion 102 of the cover 10 and the bottom plate 42 of the holding portion 4. The packing 11 prevents dust, water droplets, etc. from entering the cover 10.

[0024] (Power Unit) The power unit 2 has a power block and a case 20 that houses the power block inside.

[0025] The power supply block has a power conversion circuit that converts power supplied from an external power source (for example, AC power supplied from a commercial power source) into the power required by the light source unit 1 (DC power). The power conversion circuit includes, for example, a full-wave rectifier, a power factor correction circuit (boost chopper circuit), and a DC / DC converter (buck chopper circuit). The power supply block is constructed, for example, by mounting numerous circuit components that constitute the power conversion circuit on the surface of a printed circuit board. The power supply block also has an output cable with a plug connector at its end.

[0026] Case 20 is formed into a rectangular box shape with an open bottom by bending a metal plate, such as a galvanized steel plate. The printed circuit board on which the numerous circuit components of the power supply block are mounted is screw-fastened to the underside of the top plate of case 20. The output cable of the power supply block is routed from the open bottom of case 20 through a through-hole provided in the center of the top plate 41 of the holding unit 4 and a through-hole provided in the center of the bottom plate 42 of the holding unit 4, into the light source unit 1. In other words, the output cable of the power supply block extends almost straight downward from the open bottom of case 20 toward the light source unit 1. The output cable of the power supply block is then electrically connected to the receptacle connector of the light source unit 1 either directly or via another electrical cable.

[0027] Furthermore, a terminal block 21 is provided on the rear of the left side of the case 20. The terminal block 21 is electrically connected to the power supply block. Power lines (not shown) connected to an external power supply are connected to the terminal block 21. The terminal block 21 is connected to the power supply block located inside the case 20. The power supply block receives power from the external power supply via the terminal block 21 and the power lines.

[0028] (heat dissipation part) As shown in Figures 1 to 3, the heat dissipation section 3 is composed of multiple heat dissipation fins 31. The multiple heat dissipation fins 31 are fixed to the upper surface of the bottom plate 42.

[0029] Each heat sink fin 31 is formed from a material with excellent thermal conductivity, such as aluminum or an aluminum alloy. Each heat sink fin 31 is formed into a roughly U-shape by bending a single rectangular aluminum plate (plate material). Specifically, each heat sink fin 31 has a base portion 311 and a pair of heat sink plates 312 (312a, 312b). The pair of heat sink plates 312 are formed to extend upward from both ends of the base portion 311 in the left-right direction. That is, the pair of heat sink plates 312 are arranged to face each other.

[0030] As shown in Figure 4, the heat sink 312a is positioned at an angle θ1 with respect to the base portion 311. The heat sink 312b is positioned at an angle θ2 with respect to the base portion 311. In other words, the pair of heat sinks 312 are positioned at an incline with respect to the base portion 311 (bottom plate 42). The angles θ1 and θ2 are, for example, approximately 85°.

[0031] The base portion 311 is formed in a roughly trapezoidal plate shape. The base portion 311 is also provided with a plurality of boss holes 313 (fixing parts) that penetrate in the thickness direction. The plurality of boss holes 313 are provided along the longitudinal direction of the base portion 311. The bottom plate 42 of the holding portion 4 has a plurality of bosses corresponding to the plurality of boss holes 313 of the base portion 311. Each heat dissipation fin 31 is fixed to the bottom plate 42 by crimping the bosses of the bottom plate 42 while the plurality of bosses of the bottom plate 42 are inserted into the plurality of boss holes 313 of the base portion 311.

[0032] Thus, in the heat dissipation section 3, each heat dissipation fin 31 is formed by bending, and is fixed to the bottom plate 42 by crimping. Therefore, compared to, for example, the entire heat dissipation section 3 being integrally formed from aluminum die casting, the heat dissipation section 3 can be made smaller and lighter.

[0033] Here, as shown in Figure 3, the multiple heat dissipation fins 31 include multiple heat dissipation fins 31a (first heat dissipation fins) included in group 3a (first group), multiple heat dissipation fins 31b (second heat dissipation fins) included in group 3b (second group), multiple heat dissipation fins 31 (third heat dissipation fins) included in group 3c (third group), and multiple heat dissipation fins 31d (fourth heat dissipation fins) included in group 3d (fourth heat dissipation fins).

[0034] Group 3a is located on the front right side of the base plate 42. Group 3b is located on the rear right side of the base plate 42. Group 3c is located on the rear left side of the base plate 42. Group 3d is located on the front left side of the base plate 42. In other words, groups 3a and 3c are positioned opposite the center of the base plate 42. Groups 3b and 3d are positioned opposite the center of the base plate 42.

[0035] Furthermore, the heat sink fin 31a extends from the upper end of the heat sink 312 in the left-right direction (first direction). The heat sink fin 31b extends from the upper end of the heat sink 312 in the front-back direction (second direction). The heat sink fin 31c extends from the upper end of the heat sink 312 in the left-right direction (third direction). The heat sink fin 31d extends from the upper end of the heat sink 312 in the front-back direction (fourth direction). In other words, the extension direction of the heat sink fin 31a (front-back direction) is perpendicular (intersects) with the extension direction of the heat sink fin 31b (left-right direction). The extension direction of the heat sink fin 31c (front-back direction) is perpendicular (intersects) with the extension direction of the heat sink fin 31d (left-right direction).

[0036] Furthermore, the heat dissipation fins 31a and 31c have the same length in the front-to-back direction relative to the pair of heat sinks 312. The heat dissipation fins 31b and 31d have the same length in the left-to-right direction relative to the pair of heat sinks 312.

[0037] Furthermore, as shown in Figure 3, the base plate 42 is formed in a rectangular shape. The heat dissipation fins 31a and 31c are formed such that the upper end of the heat sink 312 is parallel to one side of the base plate 42 (one side extending in the front-to-back direction). Similarly, the heat dissipation fins 31b and 31d are formed such that the upper end of the heat sink 312 is parallel to one side of the base plate 42 (one side extending in the left-to-right direction). In other words, the extension direction of the heat dissipation fins 31a and 31c is parallel to one side of the base plate 42 (one side extending in the front-to-back direction). The extension direction of the heat dissipation fins 31b and 31d is perpendicular to one side of the base plate 42 (one side extending in the front-to-back direction).

[0038] Figure 5 is a temperature distribution diagram of the base plate according to this embodiment. Specifically, Figure 5(a) is a temperature distribution diagram of the base plate 42 according to this embodiment, and Figure 5(b) is a temperature distribution diagram of the base plate 42 when the heat dissipation unit 3 according to this embodiment is not provided in the lighting fixture. In Figures 5(a) and (b), the temperature is high in the white areas and low in the black areas. Also, in Figures 5(a) and (b), the LEDs of the light source unit 1 are arranged in area 13.

[0039] In Figure 5(b), the area including the central part of the base plate 42 according to this embodiment is white. In contrast, in Figure 5(a), the white area is smaller. This indicates that the heat dissipation performance is improved by providing the heat dissipation unit 3 according to this embodiment to the lighting fixture.

[0040] (holding part) As described above, the holding section 4 includes a top plate 41, a bottom plate 42, a pair of first support sections 43, and a pair of second support sections 44 (see Figures 1 and 2).

[0041] The top plate 41 is formed in a roughly rectangular shape from a metal plate such as aluminum or an aluminum alloy.

[0042] Each of the bottom plates 42 is formed in a roughly rectangular shape from a metal plate with excellent thermal conductivity, such as aluminum or an aluminum alloy.

[0043] The first support portion 43 and the second support portion 44 are formed, for example, by bending a single metal plate, such as a galvanized steel sheet.

[0044] The pair of first support parts 43 are arranged to face each other in the front-to-back direction. The upper ends of the first support parts 43 are connected to the top plate 41 by screws or the like. The lower ends of the first support parts 43 are connected to the bottom plate 42 by screws or the like.

[0045] The pair of second support parts 44 are arranged to face each other in the left-right direction. The second support parts 44 have through holes formed approximately in the center in the vertical direction. The second support parts 44 are connected to the top plate 41 by screws 51 through the through holes. The lower ends of the second support parts 44 are connected to the bottom plate 42 by screws or the like.

[0046] The top plate 41 and the bottom plate 42 are fixed in place by this pair of first support parts 43 and the pair of second support parts 44.

[0047] (arm) As shown in Figure 1, the arm 6 is formed in a U-shape by bending a long metal plate, such as a galvanized steel plate, at both ends in the longitudinal direction at approximately right angles in the same direction.

[0048] The arm 6 has both longitudinal ends attached to a pair of second support parts 44. Specifically, through holes 61 and slits 62 are formed in both longitudinal ends of the arm 6. The pair of second support parts 44 also have screw holes (not shown) formed at positions corresponding to the through holes 61 and slits 62. The arm 6 and the second support parts 44 can be fixed together by fastening screws 52 and 53 to the respective screw holes formed in the second support parts 44 through the through holes 61 and slits 62.

[0049] Furthermore, with the screw 53 removed, the arm 6 can rotate in the front-rear direction along the slit 62, centered on the screw 52. Specifically, with the screw 52 fastened in the through hole 61, the illumination direction of the lighting fixture can be adjusted, and after the illumination direction of the lighting fixture is determined, the arm 6 and the second support part 44 can be fixed by fastening the screw 53 through the slit 62.

[0050] As described above, the arm 6 is connected to the second support section 44 by screws 52 and 53. The first support section 43 is connected to the front and rear centers of the top plate 41 and to the front and rear centers of the bottom plate 42. The second support section 44 is connected to the left and right centers of the top plate 41 and to the left and right centers of the bottom plate 42. This configuration ensures a stable load balance for the lighting fixture.

[0051] The lighting fixture of this embodiment is installed on the ceiling of a building by tightening nuts onto a pair of suspension bolts that are inserted through bolt insertion holes 63 in the arm 6. However, it is preferable that the lighting fixture of this embodiment is further supported by wires or the like so that it does not fall even if the arm 6 becomes detached from the suspension bolts.

[0052] As described above, the lighting fixture according to this embodiment comprises a light source unit 1, a plurality of heat dissipation fins 31, and a bottom plate 42 (mounting plate) on which the light source unit 1 is attached to the top surface and the plurality of heat dissipation fins 31 are attached to the bottom surface. The plurality of heat dissipation fins 31 include a plurality of heat dissipation fins 31a (first heat dissipation fins) included in group 3a (first group) and a plurality of heat dissipation fins 31b (second heat dissipation fins) included in group 3b (second group). In a plan view, the left-right direction (first direction), which is the extension direction of the heat dissipation fins 31a, is arranged to be perpendicular (intersect) with the front-back direction (second direction), which is the extension direction of the heat dissipation fins 31b.

[0053] In this configuration, the left-right direction of extension of the multiple heat dissipation fins 31a included in group 3a intersects with the front-back direction of extension of the multiple heat dissipation fins 31b included in group 3b. As described above, in Patent Document 1, since the multiple heat dissipation fins are arranged radially, it is difficult to place the heat dissipation fins near the center of the mounting plate. In contrast, in this embodiment, the multiple heat dissipation fins 31 are divided into multiple groups, and the extension direction of the heat dissipation fins 31 is aligned for each group, making it possible to place the heat dissipation fins 31 near the center of the bottom plate 42. Furthermore, since the extension direction of the heat dissipation fins 31a and the extension direction of the heat dissipation fins 31b intersect, it is possible to place the heat dissipation fins 31 across the entire bottom plate 42. Therefore, the heat dissipation performance of the lighting fixture can be improved.

[0054] Furthermore, the extension direction (first direction) of the heat dissipation fin 31a is perpendicular to the extension direction (second direction) of the heat dissipation fin 31b. This allows the heat dissipation fins 31a of group 3a and 31b of group 3b to be placed in close proximity, thereby improving the heat dissipation performance of the lighting fixture.

[0055] Furthermore, the heat dissipation fins 31 are created by bending a single sheet of material. This makes it easier to manufacture the heat dissipation fins.

[0056] Furthermore, the heat sinks 31a and 31c have the same length in the front-to-back direction. This increases the surface area of ​​the heat sink, thereby improving the heat dissipation performance of the heat sinks. Also, since the pair of heat sinks have the same shape, it becomes easier to manufacture the heat sinks.

[0057] Furthermore, the heat sinks 31b and 31d have the same length in the front-to-back direction. This increases the surface area of ​​the heat sink, thereby improving the heat dissipation performance of the heat sinks. Also, since the pair of heat sinks have the same shape, it becomes easier to manufacture the heat sinks.

[0058] Furthermore, the bottom plate 42 is formed in a rectangular shape. The extension direction of the heat dissipation fins 31a and 31c is parallel to one side of the bottom plate 42 (the side extending in the front-to-back direction). This allows for the placement of many heat dissipation fins on the bottom plate, thereby improving the heat dissipation performance of the heat dissipation section. In addition, since the heat dissipation fins only need to be placed along one side of the bottom plate, the placement of the heat dissipation fins becomes easier.

[0059] Furthermore, the base plate 42 is formed in a rectangular shape. The extension direction of the heat dissipation fins 31b and 31d is perpendicular to one side of the base plate 42 (one side extending in the front-to-back direction). This allows for the placement of many heat dissipation fins on the base plate, thereby improving the heat dissipation performance of the heat dissipation section. In addition, since the heat dissipation fins only need to be placed along one side of the base plate (one side extending in the left-to-right direction), the placement of the heat dissipation fins becomes easier.

[0060] Furthermore, the multiple heat dissipation fins 31 include multiple heat dissipation fins 31c (third heat dissipation fins) included in group 3c (third group) and multiple heat dissipation fins 31d (fourth heat dissipation fins) included in group 3d (fourth group). In a plan view, the front-to-back direction (third direction), which is the extension direction of the heat dissipation fins 31c, is arranged to be perpendicular (intersect) with the left-to-right direction (fourth direction), which is the extension direction of the heat dissipation fins 31d. The heat dissipation fins 31a and 31c are arranged to face the center of the base plate 42. The heat dissipation fins 31b and 31d are arranged to face the center of the base plate 42. By further dividing the multiple heat dissipation fins 31 into more groups, it becomes even easier to arrange the heat dissipation fins 31 near the center of the base plate 42. Therefore, the heat dissipation performance of the lighting fixture can be improved.

[0061] (Other embodiments) As described above, embodiments have been explained as examples of the technology disclosed in this application. However, the technology in this disclosure is not limited thereto and can be applied to embodiments that are modified, replaced, added, or omitted as appropriate.

[0062] The multiple heat dissipation fins 31 may be arranged as shown in Figure 6. In Figure 6, the extension directions of the heat dissipation fins 31a to 31d of groups 3a to 3d are different compared to Figure 1. Specifically, the heat dissipation fin 31a of group 3a and the heat dissipation fin 31c of group 3c extend from the upper left to the lower right. The heat dissipation fin 31b of group 3b and the heat dissipation fin 31d of group 3d extend from the upper right to the lower left.

[0063] Furthermore, as shown in Figure 6, the lengths of the multiple heat dissipation fins 31 in the extension direction do not have to be the same in each group. For example, in Figure 6, in group 3a, the lengths of heat dissipation fins 31a and 31a' in the extension direction are different. In Figure 6, in each group, the lengths of the heat dissipation fins 31 located in the center and at the ends of the bottom plate 42 are shorter than those of the other heat dissipation fins 31. This allows more heat dissipation fins to be placed on the bottom plate 42. Thus, the lengths of the heat dissipation fins 31 in the extension direction in each group can be appropriately selected depending on the shape of the bottom plate 42 and the shape of the heat dissipation fins 31 in other groups.

[0064] Furthermore, in the above embodiment, the multiple heat dissipation fins 31 are grouped into groups 3a to 3d, but the number of groups of heat dissipation fins 31 may be 2, 3, or 5 or more. For example, the multiple heat dissipation fins 31 may be arranged as shown in Figure 7. Figure 7 shows the case where the number of groups of heat dissipation fins 31 is 8. In this case, groups 3e to 3h are arranged between groups 3a and 3b, between groups 3b and 3c, between groups 3c and 3d, and between groups 3d and 3a. Multiple heat dissipation fins 31e to 31h are arranged in groups 3e to 3h, respectively. In Figure 7, the length in the extension direction of the heat dissipation fin 31 located in the center of the bottom plate 42 is shorter than that of the other heat dissipation fins 31. This makes it possible to arrange more heat dissipation fins on the bottom plate 42.

[0065] Furthermore, in the above embodiment, the heat sinks 312a and 312b may be arranged parallel to each other. In this case, angle θ1 (angle between heat sink 312a and base portion 311) = 180° - angle θ2 (angle between heat sink 312b and base portion 311) = θ2. This allows the heat sink fins 31 to be placed adjacent to each other, thereby improving the heat dissipation performance of the lighting fixture.

[0066] Furthermore, in the above embodiment, the top plate 41 and bottom plate 42 are formed in a rectangular shape, but the invention is not limited to this, and they may be polygonal or circular in shape.

[0067] Furthermore, in the above embodiment, the lighting fixture may also be equipped with an externally located communication device (not shown) and a wireless communication unit that performs wireless communication using radio waves or infrared rays as a medium. In this case, the wireless communication unit receives wireless signals from the communication device. The power conversion circuit of the power supply unit 2 then controls the lighting state of the light source unit according to the communication signals received by the wireless communication unit. For example, the communication signals include information such as the ON / OFF status and dimming level of the light source unit 1, and the power conversion circuit controls the lighting state of the light source unit 1 according to the communication signals. Note that this wireless communication unit may be provided outside the first support portion 43 and the second support portion 44. [Industrial applicability]

[0068] The lighting fixtures disclosed herein can be installed in buildings with high ceilings, such as gymnasiums and halls, and used as so-called high-ceiling lighting fixtures to illuminate the lighting space from above. [Explanation of Symbols]

[0069] 1 Light source unit 2 Power supply units 3 Heat dissipation part Groups 3a-3d (Groups 1-4) 31 heat dissipation fins 31a~31d Heat dissipation fins (1st to 4th heat dissipation fins) 311 Base section 312 Heat sink 313 Boss hole (fixing part) 4 Holding part 42. Base plate (mounting plate) 6 Arms

Claims

1. Light source unit, Multiple heat dissipation fins, The light source unit is mounted on the upper surface, and the plurality of heat dissipation fins are mounted on the lower surface of a mounting plate. The plurality of heat dissipation fins include a plurality of first heat dissipation fins included in the first group and a plurality of second heat dissipation fins included in the second group. In a plan view, the lighting fixture is arranged such that the first direction, which is the extension direction of the first heat dissipation fin, intersects with the second direction, which is the extension direction of the second heat dissipation fin.

2. The lighting fixture according to claim 1, wherein in a plan view, the first direction and the second direction are orthogonal.

3. The lighting fixture according to claim 1, wherein the heat dissipation fins are made by bending a single sheet of plate-like material.

4. The lighting fixture according to claim 1, wherein the plurality of first heat dissipation fins have the same length in the first direction when viewed in plan.

5. The lighting fixture according to claim 1, wherein the plurality of second heat dissipation fins have the same length in the second direction when viewed in plan.

6. The mounting plate is formed in a rectangular shape, The lighting fixture according to claim 1, wherein the first direction is parallel to one side of the mounting plate.

7. The lighting fixture according to claim 6, wherein the second direction is perpendicular to the side of the mounting plate.

8. The lighting fixture according to claim 1, wherein the heat dissipation fins are attached to the mounting plate by a plurality of fixing parts.

9. The plurality of heat dissipation fins further include a plurality of third heat dissipation fins included in the third group and a plurality of fourth heat dissipation fins included in the fourth group, In a plan view, the third direction, which is the extension direction of the third heat dissipation fin, is arranged to intersect with the fourth direction, which is the extension direction of the fourth heat dissipation fin. The first and third heat dissipation fins are arranged to face the central portion of the mounting plate, The lighting fixture according to claim 1, wherein the second and fourth heat dissipation fins are arranged to face the central portion of the mounting plate.

10. The heat dissipation fin has a heat dissipation plate, The lighting fixture according to claim 1, wherein the heat sink is arranged to be inclined with respect to the mounting plate.

11. The heat dissipation fin has two heat dissipation plates arranged opposite each other, The lighting fixture according to claim 1, wherein the two heat sinks are arranged parallel to each other.

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