Lighting fixture

Abstract

To improve the heat dissipation performance of a luminaire.SOLUTION: A luminaire comprises according to an embodiment: a light source unit 1 comprising a light source, and attached to a bottom plate 42; and a plurality of heat dissipation fins 31 attached to the bottom plate 42. The heat dissipation fins 31 comprise base parts 311 fixed to the bottom plate 42, first heat dissipation plates 312, and second heat dissipation plates 313 having a shape different from that of the first heat dissipation plates 312.SELECTED DRAWING: Figure 4

Description

Technical Field

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

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 (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] By the way, the lighting fixture of Patent Document 1 is provided with a heat sink for cooling a light source. This heat sink includes a plurality of heat dissipation fins. Each heat dissipation fin is formed by bending a single sheet of sheet metal so that each has two heat dissipation plates.

[0005] In recent years, due to the high performance of LEDs, the number of devices with a large amount of heat generation has been increasing. For this reason, higher heat dissipation performance is required for lighting fixtures.

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

Means for Solving the Problems

[0007] In order to achieve the above object, a lighting fixture according to an embodiment of the present disclosure includes a light source unit having a light source and attached to a bottom plate, and a plurality of heat dissipation fins attached to the bottom plate. The heat dissipation fin has a base portion fixed to the bottom plate, a first heat dissipation plate, and a second heat dissipation plate having a different shape from the first heat dissipation plate.

Advantages of the Invention

[0008] According to the present disclosure, the heat dissipation performance of the lighting fixture can be improved.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Modes for Carrying Out the Invention

[0010] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The following description of the preferred embodiments is merely exemplary in nature and is not intended to limit the present invention, its applications, or its uses in any way.

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

[0012] Further, 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 the present embodiment includes a light source unit 1, a power supply unit 2, a heat dissipation part 3, a holding part 4, and an arm 6.

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

[0015] The heat radiating part 3 radiates heat from the light source unit 1.

[0016] The holding part 4 holds the light source unit 1. The holding part 4 has a top plate 41, a bottom plate 42, and a pair of first support parts 43. The pair of first support parts 43 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 radiating part 3 is attached to the upper surface of the bottom plate 42. The light source unit 1 is attached to the lower 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 conventional package-type white LED or the like. 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. A receptacle connector is also 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 part 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 periphery 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 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 supply unit) The power supply unit 2 has a power supply block and a case 20 that houses the power supply block inside.

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

[0026] The case 20 is formed into a rectangular box shape with an open bottom surface by bending a metal plate such as a zinc steel plate. The printed wiring board on which a large number of circuit components of the power block are mounted is screwed and fixed to the back side of the upper plate of the case 20. The output cable of the power block is drawn into the light source unit 1 through the through hole provided at the center of the top plate 41 of the holding portion 4 and the through hole provided at the center of the bottom plate 42 of the holding portion 4 from the open bottom surface of the case 20. That is, the output cable of the power block extends substantially straight downward from the open bottom surface of the case 20 toward the light source unit 1. Then, the output cable of the power block is electrically connected to the receptacle connector of the light source unit 1 directly or via another electric wire cable.

[0027] (Heat dissipation part) As shown in FIGS. 1 to 4, the heat dissipation part 3 is composed of a plurality of heat dissipation fins 31. The plurality of heat dissipation fins 31 are fixed to the upper surface of the bottom plate 42. The plurality of heat dissipation fins 31 are arranged side by side in a radial pattern when viewed from above.

[0028] Each heat dissipation fin 31 is formed of a material having excellent thermal conductivity such as aluminum or an aluminum alloy. In the present embodiment, each heat dissipation fin 31 is formed by punching and bending a single aluminum plate in a rectangular plate shape. Specifically, each heat dissipation fin 31 has a base portion 311, a pair of first heat dissipation plates 312, and a pair of second heat dissipation plates 313.

[0029] The base portion 311 is formed to have a substantially rectangular plate shape. Further, a plurality of boss holes (not shown) penetrating in the thickness direction are provided in the base portion 311. The plurality of boss holes are provided along the front-rear direction. Further, the bottom plate 42 of the holding portion 4 has a plurality of bosses so as to correspond to the plurality of boss holes of the base portion 311. Then, each heat dissipation fin 31 is fixed to the bottom plate 42 by caulking the bosses of the bottom plate 42 with the plurality of bosses of the bottom plate 42 inserted into the plurality of boss holes of the base portion 311.

[0030] In this way, in the heat dissipation part 3, each heat dissipation fin 31 is formed by punching and bending processes, and is fixed to the bottom plate 42 by caulking. Therefore, for example, compared with the case where the entire heat dissipation part 3 is integrally formed by aluminum die casting, the heat dissipation part 3 can be miniaturized and lightened.

[0031] As shown in FIG. 4, a pair of first heat dissipation plates 312 are formed in a rectangular plate shape extending upward from both end edges in the left-right direction of the base part 311. A pair of second heat dissipation plates 313 are formed in a rectangular plate shape extending upward from the base part 311 respectively. When viewed from above, the pair of second heat dissipation plates 313 are arranged between the pair of first heat dissipation plates 312. The first heat dissipation plate 312 is formed to be higher in height than the second heat dissipation plate 313. Also, the first heat dissipation plate 312 is formed to have a larger surface area than the second heat dissipation plate 313. That is, the first heat dissipation plate 311 has a different shape from the second heat dissipation plate.

[0032] (Holding part) As described above, the holding part 4 has a top plate 41, a bottom plate 42, and a first support part 43.

[0033] The top plate 41 is formed in a substantially rectangular plate shape by a metal plate such as aluminum or an aluminum alloy, for example. The top plate 41 has a pair of first convex parts 411 and a pair of second convex parts 412 on its peripheral edge.

[0034] The pair of first convex parts 411 are arranged to face each other in the front-rear direction of the top plate 41. The first convex part 411 is formed by bending the peripheral edge of the top plate 41 so as to protrude downward. A first connecting part 413 is formed substantially at the center of the first convex part 411.

[0035] The pair of second convex parts 412 are arranged to face each other in the left-right direction of the top plate 41. The second convex part 412 is formed by bending the peripheral edge of the top plate 41 so as to protrude upward. A second connecting part 414 is formed substantially at the center of the second convex part 412.

[0036] The bottom plate 42 is formed in a substantially rectangular plate shape by a metal plate having excellent thermal conductivity such as aluminum or an aluminum alloy. On the bottom plate 42, a third convex portion 421 protruding upward is formed so as to surround the outer periphery. At substantially the center in the front-rear direction of the third convex portion 421, third connecting portions 422 are respectively formed.

[0037] Each first support portion 43 is formed, for example, by bending a single metal plate such as a zinc steel plate.

[0038] A pair of first support portions 43 are arranged to face each other in the front-rear direction. The upper part of the first support portion 43 is connected to the first connecting portion 413 of the top plate 41 by a screw or the like, and the lower part is connected to the third connecting portion 422 of the bottom plate 42. The top plate 41 and the bottom plate 42 are fixed by this pair of first support portions 43.

[0039] (Arm) As shown in FIG. 1, the arm 6 is formed in a U shape by bending a long metal plate such as a zinc steel plate at both ends in the longitudinal direction at substantially right angles in the same direction.

[0040] Both end portions in the longitudinal direction of the arm 6 are attached to the second support portion 51. The second support portion 51 is connected to the second connecting portion 414 of the top plate 41 by a screw or the like. That is, the arm 6 fixes the top plate 41, the bottom plate 42, and the first support portion 43 of the holding portion 4 via the second support portion 51.

[0041] As described above, the second connecting portion 414 to which the second support portion 51 is connected is formed substantially at the center of the first convex portion 411 formed in the left-right direction of the top plate 41. Further, the first connecting portion 413 to which the first support portion 43 is fastened is formed substantially at the center of the second convex portion 412 formed in the front-rear direction of the top plate 41. That is, the arm 6 is connected in the left-right direction of the top plate 41 via the second support portion 51, and the bottom plate 42 is connected in the front-rear direction of the top plate 41 via the first support portion 43. Thereby, the balance of the load of this lighting fixture is stabilized.

[0042] Also, the arm 6 is rotatable in the front-rear direction about the screw 52 with the screw 53 removed. Through holes 61 are formed at both ends of the arm 6. After the direction of the lighting fixture is determined, the arm 6 and the second support portion 51 can be fixed by fastening the screw 53 through the through holes 61.

[0043] The lighting fixture of the present embodiment is installed on the ceiling of a building by tightening nuts on a pair of suspension bolts inserted through the bolt insertion holes of the arm 6. However, it is preferable that the lighting fixture of the present embodiment is further supported by a wire or the like so that the lighting fixture does not fall even if the arm 6 comes off the suspension bolt.

[0044] As described above, the lighting fixture according to the present embodiment includes a light source unit 1 attached to the bottom plate 42 and having a light source, and a plurality of heat dissipation fins 31 attached to the bottom plate 42. The heat dissipation fin 31 includes a base portion 311 fixed to the bottom plate 42, a first heat dissipation plate 312, and a second heat dissipation plate 313 having a different shape from the first heat dissipation plate 312.

[0045] With this configuration, since the first heat dissipation plate 312 and the second heat dissipation plate 313 are formed on the heat dissipation fin 31, the number of heat dissipation plates provided for one heat dissipation fin 31 can be increased, so that the heat dissipation performance of the lighting fixture can be improved. Further, since the shapes of the first heat dissipation plate 312 and the second heat dissipation plate 313 are different from each other, a plurality of types of heat dissipation plates can be installed by attaching one heat dissipation fin 31 to the lighting fixture, so that the trouble of adjusting the pitch between the heat dissipation plates can be saved.

[0046] Also, a pair of first heat dissipation plates 312 are formed at both ends of the base portion 311 of the heat dissipation fin 31. When viewed from above, a pair of second heat dissipation plates 313 are formed between the pair of first heat dissipation plates 312. The first heat dissipation plate 312 and the second heat dissipation plate 313 have different heights. Thereby, the first heat dissipation plate 312 and the second heat dissipation plate 313 can be made into a simple configuration.

[0047] Further, the first heat sink 312 is higher in height than the second heat sink 313. Thereby, the first heat sink 312 and the second heat sink 313 can be configured simply.

[0048] Also, the first heat sink 312 has a larger surface area than the second heat sink 313. Thereby, the first heat sink 312 and the second heat sink 313 can be configured simply.

[0049] (Other Embodiments) As described above, embodiments have been described as examples of the technology disclosed in the present application. However, the technology in the present disclosure is not limited thereto, and is also applicable to embodiments in which changes, replacements, additions, omissions, etc. are made as appropriate.

[0050] In the above embodiment, the first heat sink 312 is formed to be higher in height than the second heat sink 313, but the present invention is not limited thereto, and the second heat sink 313 may be higher in height than the first heat sink 312. Also, the first heat sink 312 is formed to have a larger surface area than the second heat sink 313, but the present invention is not limited thereto, and the second heat sink 313 may have a larger surface area than the first heat sink 312. That is, in the present embodiment, it is sufficient that the shapes of the first heat sink 312 and the second heat sink 313 are different.

[0051] Also, in the above embodiment, the heat dissipation fins 31 are arranged in a radial pattern when viewed from above (see FIG. 3), but the arrangement of the heat dissipation fins 31 is not limited thereto. For example, when viewed from above, the heat sinks 312 may be arranged side by side in the left-right direction or the front-rear direction.

Industrial Applicability

[0052] The lighting fixture of the present disclosure can be used as a so-called high-ceiling lighting fixture that is installed in a building with a high ceiling such as a gymnasium or a hall and illuminates the lighting space from above.

Explanation of Reference Numerals

[0053] 1 Light source unit 2 Power unit 3 Heat dissipation part 31 Heat dissipation fins 311 Base part 312 First heat dissipation plate 313 Second heat dissipation plate 4 Holding part 41 Top plate 42 Bottom plate 43 First support part 51 Second support part 6 Arm

Claims

1. A lighting fixture comprising a light source unit having a light source and attached to a bottom plate, and a plurality of heat dissipation fins attached to the bottom plate, wherein the heat dissipation fins have a base portion fixed to the bottom plate, a first heat dissipation plate, and a second heat dissipation plate having a different shape from the first heat dissipation plate, wherein a pair of the first heat dissipation plates are formed at both ends of the base portion of the heat dissipation fins, and a pair of the second heat dissipation plates are formed between the pair of the first heat dissipation plates when viewed from above, and the first heat dissipation plate and the second heat dissipation plate have different heights.

2. The lighting fixture according to Claim 1, wherein a notch is formed in the base portion.

3. The lighting fixture according to Claim 1 or 2, wherein the first heat dissipation plate is higher than the second heat dissipation plate.

4. The lighting fixture according to any one of Claims 1 to 3, wherein the first heat dissipation plate has a larger surface area than the second heat dissipation plate. ​

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