Luminaire

Abstract

To provide a luminaire comprising fins capable of efficiently dissipating heat while restraining increase in the weight of a main body part.SOLUTION: A luminaire comprises: a light source module; a power supply part for supplying electric power to the light source module; an attachment plate to which the light source module is attached; and a main body part housing the light source module, the power supply part, and the attachment plate. The main body part comprises a first case part in which the power supply part is housed, a second case part in which the light source module is housed, and a plurality of fins provided side by side in a first direction outside the first case part. The length of the fins in a second direction orthogonal to the first direction is equal to or longer than the length of the attachment plate in the second direction, and equal to or shorter than the length of the second case part in the second direction.SELECTED DRAWING: Figure 8

Description

Technical Field

[0001] The present disclosure relates to a lighting fixture.

Background Art

[0002] Conventionally, a lighting fixture is known that includes a light source unit and a power supply unit that supplies power to the light source unit, and houses the light source unit and the power supply unit in a main body unit (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in a small lighting fixture, when adopting a configuration in which both a light source unit and a power supply unit that generate heat are housed in the main body unit as in Patent Document 1, heat tends to accumulate inside the main body unit. To solve this, it is conceivable to provide fins on the main body unit to improve heat dissipation, but there is a problem that the weight of the main body unit increases due to the provision of the fins.

[0005] The present disclosure solves the above problems, and an object thereof is to provide a lighting fixture that can efficiently dissipate heat while suppressing an increase in the weight of the main body unit.

Means for Solving the Problems

[0006] The lighting fixture according to the present disclosure includes a light source module, a power supply unit that supplies power to the light source module, a mounting plate to which the light source module is attached, and a main body unit that houses the light source module, the power supply unit, and the mounting plate. The main body unit has a first housing portion that houses the power supply unit, a second housing portion that houses the light source module, and a plurality of fins provided side by side in a first direction outside the first housing portion. The length of the fins in a second direction orthogonal to the first direction is equal to or greater than the length of the mounting plate in the second direction and equal to or less than the length of the second housing portion in the second direction.

Effect of the Invention

[0007] According to the lighting fixture in the present disclosure, the length of the fins in the second direction is equal to or greater than the length of the mounting plate in the second direction and equal to or less than the length of the second housing portion in the second direction. Therefore, the fins of the lighting fixture can efficiently dissipate heat while suppressing an increase in the weight of the main body unit.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Embodiments for Carrying Out the Invention

[0009] Hereinafter, embodiments of the lighting fixture 100 according to the present disclosure will be described with reference to the drawings. In each drawing, those denoted by the same reference numerals are the same or corresponding ones, which is common throughout the specification. Note that in each drawing, the relative dimensional relationships or shapes of the respective constituent members may be different from the actual ones.

[0010] Embodiment 1. FIG. 1 is an external perspective view of the lighting fixture 100 according to Embodiment 1. The lighting fixture 100 of the present embodiment is a projector used, for example, as outdoor lighting. As shown in FIG. 1, the lighting fixture 100 includes a support portion 10 attached to a mounting portion (not shown) such as a mounting base or a pole, a light source unit 20 held by the support portion 10, and an electric wire 30 connected to the light source unit 20.

[0011] In the present disclosure, the surface that irradiates the light of the lighting fixture 100 is defined as the upper surface, and the surface opposite to the upper surface is defined as the lower surface. Also, the direction from the upper surface to the lower surface or from the lower surface to the upper surface is defined as the vertical direction, the direction orthogonal to the vertical direction, and the long side direction of the light source unit 20 is defined as the left - right direction, and the direction orthogonal to the vertical direction and the left - right direction, and the short side direction of the light source unit 20 is defined as the depth direction for explanation. The left - right direction corresponds to the "first direction" of the present disclosure, and the depth direction corresponds to the "second direction" of the present disclosure.

[0012] (Support portion 10) As shown in Fig. 1, the support part 10 is a member formed by bending a sheet metal into a U shape, and includes a fixing part 11 provided with a plurality of mounting holes 111, and two arms 12 extending vertically from both ends of the fixing part 11. The support part 10 is fixed to the part to be mounted through the plurality of mounting holes 111 provided in the fixing part 11 with a fixing tool (not shown) such as a bolt. Further, the support part 10 is rotatably attached to the light source unit 20 about the fixing tool 13 by fixing the arms 12 to the side surface of the light source unit 20 with a fixing tool 13 such as a bolt.

[0013] (Light source unit 20) The configuration of the light source unit 20 will be described with reference to Figs. 2 to 4. Fig. 2 is an exploded perspective view of the lighting fixture 100 according to the first embodiment. Fig. 3 is a schematic cross-sectional view of the lighting fixture 100 according to the first embodiment. Fig. 4 is an external perspective view showing a state in which the cover frame 21, the cover 22, and the lens 23 are removed from the lighting fixture 100 according to the first embodiment. As shown in Figs. 2 and 3, the light source unit 20 includes a light source part 2 that irradiates light, a power supply part 3 that supplies power to the light source part 2, a main body part 4 that holds the light source part 2 and the power supply part 3, and a fall prevention part 5 that prevents the light source unit 20 from falling.

[0014] The light source part 2 includes a cover frame 21, a cover 22, a lens 23, a light source module 24, and a mounting plate 25. The cover frame 21 is composed of a steel plate processed into a rectangular frame shape. The cover frame 21 holds the cover 22 and is attached to the main body part 4 with a fixing tool 211 such as a screw. The cover 22 is composed of rectangular tempered glass, and packing 221 for water stop is provided on the four sides of the cover 22. The lens 23 is disposed on the optical axis of the light source module 24 and controls the traveling direction of the light irradiated from the light source module 24. The lens 23 is attached to the mounting plate 25 with a fixing tool 231 such as a screw. The length of the lens 23 in the depth direction (short side direction) is substantially the same as that of the mounting plate 25 or larger than the mounting plate 25 by the thickness of its material.

[0015] The light source module 24 includes a plurality of light-emitting elements 241 arranged in a matrix and a substrate 242 on which the plurality of light-emitting elements 241 are mounted. The plurality of light-emitting elements 241 are, for example, surface-mounted or COB-type LED elements that emit daylight white light. Alternatively, the plurality of light-emitting elements 241 may be solid laser elements, semiconductor laser elements, or organic EL elements. Note that the arrangement of the plurality of light-emitting elements 241 is not limited to the example of FIG. 2, and they may be arranged radially from the center of the substrate 242.

[0016] As shown in FIGS. 3 and 4, the light source module 24 is attached to the mounting plate 25 by a fixture 243 such as a screw. The mounting plate 25 is a flat member and is attached to the main body 4 by a fixture 251 such as a screw with the lens 23 and the light source module 24 attached. The mounting plate 25 is made of, for example, aluminum.

[0017] As shown in FIGS. 2 and 3, the power supply unit 3 includes a lighting device 31 and a substrate 32. The lighting device 31 is electrically connected to the plurality of light-emitting elements 241 by wiring (not shown) and supplies power for lighting the plurality of light-emitting elements 241. The substrate 32 holds the lighting device 31 and is attached to the main body 4 by a fixture (not shown) such as a screw. An electric wire 30 is connected to the terminal block of the substrate 32, and power from commercial power provided outside is supplied to the lighting device 31 via the electric wire 30.

[0018] As shown in FIGS. 2 and 4, the main body 4 includes a housing 41 and a plurality of fins 42 provided outside the housing 41. The housing 41 and the plurality of fins 42 of the main body 4 are integrally formed by die-casting aluminum. The housing 41 has a box shape with an open top surface. The plurality of fins 42 dissipate heat generated from the light source module 24 and the power supply unit 3. In particular, the heat generated from the light source module 24 is temporarily stored in the mounting plate 25 and then transmitted from the mounting plate 25 to the main body 4 and dissipated into the air from the fins 42 of the main body 4. Further, a flange 43 for attaching the cover 22 and the cover frame 21 is provided around the opening of the housing 41.

[0019] As shown in FIG. 3, in the present embodiment, the lens 23, the light source module 24, and the power supply unit 3 are housed inside the housing 41, and the housing 41 is closed by the cover 22 and the cover frame 21. Specifically, the housing 41 includes a first housing portion 41a composed of a bottom surface portion 411 and a first side surface 412 rising from the bottom surface portion 411, and a second housing portion 41b composed of a mounting portion 413 and a second side surface 414 rising from the mounting portion 413. The power supply unit 3 is housed inside the first housing portion 41a and fixed to the bottom surface portion 411 by a fixture (not shown) such as a screw. The bottom surface portion 411 is formed to have an area substantially equivalent to the area of the substrate 32 of the power supply unit 3 for the purpose of miniaturizing the lighting fixture 100.

[0020] Also, the lens 23 and the light source module 24 are housed inside the second housing portion 41b and fixed to the mounting portion 413 by a fixture 251 via the mounting plate 25. The mounting portion 413 is a flat surface formed at a position on the opening side (upper side) rather than the bottom surface portion 411, and is provided one by one on both sides in the depth direction of the housing 41. The two mounting portions 413 have substantially the same dimensions. A part of the mounting plate 25 (for example, a part on the front side) is placed on one mounting portion 413, and a part of the mounting plate 25 (for example, a part on the back side) is placed on the other mounting portion 413. The second side surface 414 has a shape along the outer shape of the lens 23 for the purpose of miniaturizing the lighting fixture 100.

[0021] Furthermore, the cover 22 and the cover frame 21 are arranged on the flange 43 of the housing 41 and fixed to the housing 41 by a fixture 211. With such a configuration, intrusion of water into the housing 41 can be prevented, and the lighting fixture 100 can be used as outdoor lighting.

[0022] As shown in FIGS. 2 and 4, the fall prevention portion 5 includes a wire and connection terminals provided at both ends of the wire. The fall prevention portion 5 is connected to the side surface of the housing 41 and the mounted portion to which the lighting fixture 100 is mounted. By the fall prevention portion 5, even if the light source unit 20 comes off the support portion 10, it is possible to suppress the light source unit 20 from falling.

[0023] Next, with reference to FIGS. 5 to 7, the details of the shapes of the respective parts around the main body 4 will be described. FIG. 5 is a plan view of the main body 4 according to Embodiment 1 as viewed from above. FIG. 6 is a plan view of the main body 4 according to Embodiment 1 as viewed from below. FIG. 7 is a schematic cross-sectional view of the main body 4 according to Embodiment 1. In FIG. 5, the general shape of the mounting plate 25 placed on the mounting portion 413 is shown by a broken line. Further, in FIG. 7, the general shape of the mounting plate 25 placed on the mounting portion 413 is shown by narrow hatching. FIG. 5 shows the length La in the depth direction of the front and rear mounting portions 413. The length Lp in the depth direction of the mounting plate 25 is, for example, 154 mm. Also, the length La in the depth direction of the mounting portion 413 is, for example, 23.1 mm.

[0024] As shown in FIG. 6, the plurality of fins 42 each extend in the depth direction of the housing 41 and are arranged at intervals in the left-right direction (long side direction) of the housing 41. FIGS. 6 and 7 show the length Lf in the depth direction of the fins 42. The length Lf in the depth direction of the fins 42 is equal to or greater than the length Lp in the depth direction of the mounting plate 25 and equal to or less than the length Lc in the depth direction of the second housing portion 41b, and is, for example, 156 mm. Note that the length Lc in the depth direction of the second housing portion 41b is the distance between the outer surfaces facing each other in the depth direction of the second housing portion 41b, and is, for example, 160 mm.

[0025] As shown in FIG. 7, the fin 42 has a shape that widens upward and is inclined by θ1° in the depth direction with respect to a line extending in the vertical direction. The inclination angle θ1 in the depth direction of the fin 42 is, for example, 4°. Also, the first side surface 412 of the housing 41 also has a shape such that the opening of the housing 41 becomes larger upward and is inclined by θ2° with respect to a line extending in the vertical direction. θ2 is, for example, 2° to 3°. Also, the thickness D (length in the vertical direction) of the mounting plate 25 is, for example, 4 mm.

[0026] Here, from the viewpoints of the weight of the lighting fixture 100 and the temperature of the light source unit 2, the dimensions of each part preferable in the present embodiment will be described. Specifically, hereinafter, the length Lf in the depth direction of the fin 42, the inclination angle θ1 in the depth direction of the fin 42, the thickness D of the mounting plate 25, and the length La in the depth direction of the mounting portion 413 will be described.

[0027] First, the length Lf in the depth direction of the fin 42 will be described. FIG. 8 shows the simulation results of the relationship between the length Lf in the depth direction of the fin 42, the weight of the main body portion 4, and the temperature of the light source unit 2. The surface area of the fin 42 affects the heat dissipation performance of the lighting fixture 100. By increasing the length Lf in the depth direction of the fin 42, the surface area of the fin 42, and thus the surface area of the main body portion 4, increases, so that the heat dissipation performance can be improved. On the other hand, by increasing the length Lf in the depth direction of the fin 42, the weight of the main body portion 4 increases. In the simulation of FIG. 8, the thickness D of the mounting plate 25 was set to 4.0 mm, the length La in the depth direction of one-sided mounting portion 413 was set to 23.1 mm, and the inclination angle θ1 in the depth direction of the fin 42 was set to 4°. Also, the length Lp in the depth direction of the mounting plate 25 was set to 154 mm, and the length Lc in the depth direction of the second housing portion 41b was set to 160 mm. Then, under this condition, the length Lf in the depth direction of the fin 42 was changed based on 154 mm, which is the length Lp in the depth direction of the mounting plate 25 described above, and the weight of the main body portion 4 and the temperature of the light source unit 2 at that time were recorded. Note that the temperature of the light source unit 2 is the junction temperature of the light emitting element 241.

[0028] According to FIG. 8, when the length Lf in the depth direction of the fin 42 is 156 mm, the temperature of the light source unit 2 is the lowest, and when it exceeds 156 mm, the temperature is shown to be rising (at least not decreasing). As described above, in the lighting fixture 100 of the present embodiment, the heat generated from the light source module 24 is temporarily stored in the mounting plate 25 and then transmitted from the mounting plate 25 to the main body portion 4 and dissipated from the main body portion 4 into the air. Based on this point and the simulation results of FIG. 8, when the length Lf in the depth direction of the fin 42 is within a certain size with respect to the length Lp in the depth direction of the mounting plate 25, relatively high heat dissipation can be expected, but if it becomes too large, it can be seen that the heat dissipation of the fin 42 decreases. That is, when the length Lf in the depth direction of the fin 42 exceeds a certain size, it does not contribute to the improvement of heat dissipation and only causes an increase in weight. Specifically, in the simulation results of FIG. 8, when the length Lf in the depth direction of the fin 42 is 156 mm and the temperature of the light source unit 2 is the lowest, and the length Lp in the depth direction of the mounting plate 25 is 154 mm, it is preferable to set the length Lf in the depth direction of the fin 42 within the range of +2 mm with respect to the length Lp in the depth direction of the mounting plate 25.

[0029] According to the present embodiment, since the length Lf in the depth direction of the fin 42 is 156 mm (154 mm + 2 mm), it is within the range of +2 mm with respect to the length Lp in the depth direction of the mounting plate 25. Therefore, the fin 42 has high heat dissipation, and an increase in the weight of the main body portion 4 is also suppressed. In particular, since the length Lf in the depth direction of the fin 42 is 156 mm, as can be seen from the results of FIG. 8, the heat dissipation can be maximized.

[0030] Note that, as described above, the second side surface 414 of the second housing portion 41b has a shape along the outer shape of the lens 23 for the purpose of miniaturizing the lighting fixture 100. Also, the length of the lens 23 in the depth direction is substantially the same as that of the mounting plate 25 or larger than the mounting plate 25 by the thickness of its material. Therefore, if the length Lf of the fins 42 in the depth direction is limited to be equal to or less than the length Lc of the second housing portion 41b in the depth direction, it will not become excessively large based on the length Lp of the mounting plate 25 in the depth direction. Thus, if the length Lf of the fins 42 in the depth direction is equal to or less than the length Lc of the second housing portion 41b in the depth direction, the heat dissipation of the fins 42 is relatively high, and an increase in the weight of the main body portion 4 is also suppressed. Based on the above points, in the present disclosure, it is sufficient that the length Lf of the fins 42 in the depth direction satisfies being equal to or greater than the length Lp of the mounting plate 25 in the depth direction and equal to or less than the length Lc of the second housing portion 41b in the depth direction.

[0031] Second, the inclination angle θ1 of the fins 42 in the depth direction will be described. FIG. 9 is a simulation result showing the relationship between the inclination angle θ1 of the fins 42 in the depth direction and the temperature of the light source unit 2. The inclination angle θ1 of the fins 42 in the depth direction is related to the surface area of the main body, similar to the length Lf of the fins 42 in the depth direction. By reducing the inclination angle θ1 of the fins 42 in the depth direction, the surface area of the fins 42 and thus the surface area of the main body portion 4 can be increased, and the heat dissipation can be improved. In the simulation of FIG. 9, the thickness D of the mounting plate 25 was set to 4.0 mm, the length La of the mounting portion 413 in the depth direction was set to 23.1 mm, and the length Lf of the fins 42 in the depth direction was set to 156 mm. Then, under this condition, the inclination angle θ1 of the fins 42 in the depth direction was changed, and the temperature of the light source unit 2 at that time was recorded.

[0032] According to FIG. 9, it can be seen that the temperature of the light source unit 2 is low when the inclination angle θ1 in the depth direction of the fin 42 is 4°. Also, in the range where the inclination angle θ1 in the depth direction of the fin 42 is 2° or more and 4° or less, it can be seen that the temperature change is smaller than in the range where the inclination angle θ1 in the depth direction of the fin 42 is other angles. Further, considering the draft angle of the fin 42 manufactured by die casting, it is not easy to make the inclination angle in the depth direction of the fin 42 less than 2°. Therefore, in the present embodiment, the inclination angle θ1 in the depth direction of the fin 42 is preferably set to an angle of 2° or more and 4° or less. According to the present embodiment, since the inclination angle in the depth direction of the fin 42 is 4°, the fin 42 has high heat dissipation performance.

[0033] Thirdly, the thickness D of the mounting plate 25 will be described. FIG. 10 shows the simulation results of the relationship between the thickness D of the mounting plate 25, the weight of the mounting plate 25, and the temperature of the light source unit 2. The light source module 24 is directly mounted on the mounting plate 25, and the heat generated from the light source module 24 is temporarily transmitted to the mounting plate 25. Therefore, the thickness D of the mounting plate 25 affects the heat dissipation performance of the lighting fixture 100. By increasing the thickness D of the mounting plate 25, the heat dissipation performance can be improved. On the other hand, by increasing the thickness D of the mounting plate 25, the weight of the mounting plate 25 increases. In the simulation of FIG. 10, the length in the depth direction of the mounting portion 413 was set to 23.1 mm. Then, under this condition, the thickness D of the mounting plate 25 was changed, and the weight of the main body portion 4 and the temperature of the light source unit 2 at that time were recorded.

[0034] According to FIG. 10, it can be seen that in the section where the thickness D of the mounting plate 25 is 4.0 mm or less, the slope of the broken line indicating the temperature of the light source unit 2 is greater than that in the section where the thickness D of the mounting plate 25 is more than 4.0 mm. Therefore, it can be seen that when the thickness D of the mounting plate 25 is 4.0 mm, the efficiency of dissipating heat with respect to the weight of the main body 4 is the highest. Also, in the light source unit 2, when using a light source unit 20 that requires less power to obtain the required amount of light, the thickness D of the mounting plate 25 can be reduced while suppressing the rise in the temperature of the light source unit 2. Considering the standard and workability of the plate thickness of the aluminum plate constituting the mounting plate 25, specifically, when the thickness D of the mounting plate 25 is set to 2.0 mm, heat can be efficiently dissipated. Therefore, in the configuration of the light source module 24 of the present embodiment, it is preferable that the thickness D of the mounting plate 25 is set to 2.0 mm or more and 4.0 mm or less. However, it is desirable to set the thickness D of the mounting plate 25 to 4.0 mm, which has the highest heat dissipation performance. According to the present embodiment, since the thickness D of the mounting plate 25 is 4.0 mm, the light source unit 20 has high heat dissipation performance.

[0035] Fourthly, the length La in the depth direction of the mounting portion 413 will be described. FIG. 11 is a simulation result showing the relationship between the length La in the depth direction of the mounting portion 413 and the temperature of the light source unit 2. The length La in the depth direction of the mounting portion 413 affects the heat dissipation performance of the lighting fixture 100. By increasing the length La in the depth direction of the mounting portion 413, the contact area between the mounting plate 25 and the main body 4 can be increased, and the heat dissipation performance can be improved. In the simulation of FIG. 11, the thickness D of the mounting plate 25 was set to 4.0 mm, the length Lf in the depth direction of the fin 42 was set to 156 mm, and the inclination angle θ1 in the depth direction of the fin 42 was set to 4°. Then, under this condition, the length La in the depth direction of the mounting portion 413 was changed, and the temperature of the light source unit 2 at that time was recorded.

[0036] In FIG. 11, it can be seen that when the length La in the depth direction of the mounting portion 413 on one side is 23.1 mm, the temperature of the light source unit 2 becomes the lowest. Therefore, the length La in the depth direction of the mounting portion 413 is preferably 23.1 mm. In the present embodiment, when the length La in the depth direction of the mounting portion 413 on one side is 23.1 mm, the length in the depth direction of the mounting portions 413 on both sides (46.2 mm) corresponds to approximately 30% of the length Lp in the depth direction of the mounting plate 25. At this time, the dimension of 23.1 mm in the length La in the depth direction of the mounting portion 413 is the length when the maximum area is used as the mounting portion 413 excluding the area where the power supply unit 3 is placed. Further, the total area of the mounting portions 413 on both sides corresponds to the area obtained by subtracting the area of the bottom surface portion 411 of the first housing portion 41a from the area of the surface (see FIG. 5) including the mounting portion 413 of the second housing portion 41b.

[0037] In the present embodiment, when aiming for a product life of 40,000 hours and a luminous flux maintenance rate of 85%, it is necessary to keep the junction temperature of the light emitting element 241 at 75° C. or lower. According to FIG. 11, when the length La in the depth direction of the mounting portion 413 is 20.0 mm, the temperature of the light source unit 2 becomes 75° C. When the length La in the depth direction of the mounting portion 413 on one side is 20.0 mm, the length in the depth direction of the mounting portions 413 on both sides (40.0 mm) corresponds to approximately 25% of the length Lp in the depth direction of the mounting plate 25. Therefore, in the present embodiment, the mounting plate 25 may be in contact with the mounting portion 413 at a portion having a length of 25% or more and 30% or less in the depth direction.

[0038] According to the present embodiment, since the length in the depth direction of the mounting portion 413 is ensured to the maximum, and the region having a width of 23.1 mm, that is, approximately 30% of the length Lp in the depth direction of the mounting plate 25, is in contact with the main body portion 4, the main body portion 4 has high heat dissipation performance.

[0039] As described above, according to the present embodiment, the length La in the second direction orthogonal to the first direction of the fin 42 is equal to or greater than the length Lp in the second direction of the mounting plate 25 and equal to or less than the length Lc in the second direction of the second housing portion 41b. Therefore, the lighting fixture 100 can efficiently dissipate heat while suppressing an increase in the weight of the main body portion 4.

[0040] The above is the description of the embodiment. However, the present disclosure is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present disclosure. For example, the inclination angle θ1 in the depth direction of the fin 42, the thickness D of the mounting plate 25, and the length La in the depth direction of the mounting portion 413 may be different from the dimensions described in the first embodiment. At least, by making the length Lf in the depth direction of the fin 42 equal to or greater than the length Lp in the depth direction of the mounting plate 25 and equal to or less than the length Lc in the second direction of the second housing portion 41b, the heat dissipation performance can be improved.

[0041] Hereinafter, various aspects of the present disclosure will be collectively described as appendices.

[0042] (Appendix 1) A light source module, A power supply unit that supplies power to the light source module, A mounting plate to which the light source module is attached, A main body portion that houses the light source module, the power supply unit, and the mounting plate, The main body portion includes A first housing portion that houses the power supply unit, A second housing portion that houses the light source module, A plurality of fins provided side by side in the first direction outside the first housing portion, The length of the fin in a second direction orthogonal to the first direction is equal to or greater than the length of the mounting plate in the second direction and equal to or less than the length of the second housing portion in the second direction. A lighting fixture. (Appendix 2) The length of the fin in the second direction is equal to or greater than the length of the mounting plate in the second direction and equal to or less than the length obtained by adding 2 mm to the length of the mounting plate in the second direction. The lighting fixture according to Supplementary Note 1. (Supplementary Note 3) The inclination angle of the fin in the depth direction is 2° or more and 4° or less. The lighting fixture according to Supplementary Note 1 or 2. (Supplementary Note 4) The thickness of the mounting plate is 2 mm or more and 4 mm or less. The lighting fixture according to any one of Supplementary Notes 1 to 3. (Supplementary Note 5) The main body part has a mounting part on which the mounting plate is placed, 25% or more and 30% or less of the length of the mounting plate in the second direction is in contact with the mounting part. The lighting fixture according to any one of Supplementary Notes 1 to 4.

Explanation of Reference Numerals

[0043] 2 Light source part, 3 Power supply part, 4 Main body part, 5 Fall prevention part, 10 Support part, 11 Fixing part, 12 Arm, 13 Fixture, 20 Light source unit, 21 Cover frame, 22 Cover, 23 Lens, 24 Light source module, 25 Mounting plate, 30 Electric wire, 31 Lighting device, 32 Substrate, 41 Housing, 41a First housing part, 41b Second housing part, 42 Fin, 43 Flange, 100 Lighting fixture, 111 Mounting hole, 211 Fixture, 221 Packing, 231 Fixture, 241 Light emitting element, 242 Substrate, 243 Fixture, 251 Fixture, 411 Bottom surface part, 412 First side surface, 413 Mounting part, 414 Second side surface.

Claims

1. A light source module, A power supply unit that supplies power to the light source module, A mounting plate to which the light source module is attached, And a main body unit that houses the light source module, the power supply unit, and the mounting plate. The main body unit Has a first housing portion that houses the power supply unit, A second housing portion that houses the light source module, And a plurality of fins provided side by side in a first direction outside the first housing portion, The length of the fins in a second direction orthogonal to the first direction is equal to or greater than the length of the mounting plate in the second direction and equal to or less than the length of the second housing portion in the second direction. Lighting fixture.

2. The length of the fins in the second direction is equal to or greater than the length of the mounting plate in the second direction and equal to or less than the length obtained by adding 2 mm to the length of the mounting plate in the second direction. The lighting fixture according to claim 1.

3. The inclination angle of the fins in the depth direction is 2° or more and 4° or less. The lighting fixture according to claim 1 or 2.

4. The thickness of the mounting plate is 2 mm or more and 4 mm or less. The lighting fixture according to claim 1 or 2.

5. The main body unit Has a mounting portion on which the mounting plate is placed, 25% or more and 30% or less of the length of the mounting plate in the second direction is in contact with the mounting portion. The lighting fixture according to claim 1 or 2.

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