Lighting fixtures

Abstract

To reduce the weight of lighting fixtures while improving heat dissipation performance. [Solution] The lighting fixture comprises a light source unit 1 having a light source and attached to a base plate 42, a top plate 41 positioned opposite the base plate 42, a first support portion 43 connecting the base plate 42 and the top plate 41, an arm 6 for fixing the lighting fixture to the ceiling, and a second support portion 51 fastening the top plate 41 and the arm 6. A first connecting portion 413 connecting the first support portion 43 and the top plate 41, and a second connecting portion 414 connecting the second support portion 51 and the top plate 41 are positioned at different locations. The first support portion 43 is provided on only one side of the base plate 42 and does not extend across two or more sides of the base plate 42. The first connecting portion 413 is provided on a pair of opposing sides of the top plate 41, and the second connecting portion 414 is provided on the other pair of opposing sides of the top plate 41.

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 (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, in the lighting fixture of Patent Document 1, a top plate to which a power supply unit is fixed and a light source unit are fixed by a support frame assembly. Specifically, the top plate and the light source unit are fastened to each support constituting the support frame assembly. Then, an arm for fixing the lighting fixture to the ceiling is attached to this support frame assembly. In this configuration, since the support frame assembly supports the top plate, the power supply unit, the light source unit, etc., it is necessary to ensure the strength of the support frame assembly.

[0005] In Patent Document 1, the support frame assembly is composed of four main supports and two intermediate supports. However, in this configuration, the weight of the support frame assembly increases, so the weight of the lighting fixture increases. In addition, since the support frame assembly widely covers the outer periphery of the heat sink, the heat dissipation performance of the lighting fixture may deteriorate.

[0006] Therefore, an object of the present disclosure is to provide a lighting fixture that suppresses the weight of the lighting fixture and improves the heat dissipation 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 having a light source and attached to a base plate, a top plate positioned opposite to the base plate, a first support portion connecting the base plate and the top plate, an arm for fixing the lighting fixture to the ceiling, and a second support portion connecting the top plate and the arm, wherein a first connecting portion connecting the first support portion and the top plate and a second connecting portion connecting the second support portion and the top plate are positioned at different locations, the second support portion is provided on only one side of the base plate and not on two or more sides of the base plate, the first connecting portion is provided on a pair of opposing sides of the top plate and the second connecting portion is provided on another pair of opposing sides of the top plate. [Effects of the Invention]

[0008] According to this disclosure, it is possible to improve heat dissipation performance while reducing the weight of the lighting fixture. [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 from above of another example of a lighting fixture according to this embodiment. [Figure 5] A perspective view from above of another example of a lighting fixture 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, for 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 of the light source unit 1.

[0016] The holding unit 4 holds the light source unit 1. The holding unit 4 has a top plate 41, a bottom plate 42, and a pair of first support portions 43. The pair of first support portions 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 dissipation unit 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 package-type white LED 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] A plurality of LEDs are mounted side by side vertically and horizontally on the lower surface of the mounting substrate 12. Further, 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 conductors 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 a 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 project 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 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 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] (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. The multiple heat dissipation fins 31 are arranged in a radial pattern when viewed from above (see Figure 3).

[0028] Each heat dissipation fin 31 is formed from a material with excellent thermal conductivity, such as aluminum or an aluminum alloy. Each heat dissipation fin 31 is formed into a roughly U-shape by bending a single rectangular aluminum plate. Specifically, each heat dissipation fin 31 has a base portion 311 and a pair of heat dissipation plates 312. The pair of heat dissipation plates 312 are formed to extend upward from both ends of the base portion 311 in the left-right direction.

[0029] The base portion 311 is formed in the shape of a roughly trapezoidal plate. The base portion 311 is also provided with a plurality of boss holes that penetrate in the thickness direction. The plurality of boss holes 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 with the plurality of bosses of the bottom plate 42 inserted into the plurality of boss holes 313 of the base portion 311.

[0030] 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.

[0031] (holding part) As described above, the holding part 4 has a top plate 41, a bottom plate 42, and a first support part 43.

[0032] The top plate 41 is formed in a substantially rectangular shape from a metal plate such as aluminum or an aluminum alloy. The top plate 41 has a pair of first protrusions 411 and a pair of second protrusions 412 on its periphery.

[0033] A pair of first protrusions 411 are arranged so as to face each other in the front-to-back direction of the top plate 41. The first protrusions 411 are formed by bending the peripheral edge of the top plate 41 so that it protrudes downward. A first connecting portion 413 is formed approximately in the center of the first protrusions 411.

[0034] The pair of second protrusions 412 are arranged so as to face each other in the left-right direction of the top plate 41. The second protrusions 412 are formed by bending the peripheral edge of the top plate 41 so that it protrudes upward. A second connecting portion 414 is formed approximately in the center of the second protrusions 412.

[0035] The base plate 42 is formed in a substantially rectangular shape from a metal plate with excellent thermal conductivity, such as aluminum or an aluminum alloy. The base plate 42 has a third protrusion 421 that protrudes upward so as to surround its outer circumference. Each of the third protrusions 421 has a third connecting portion 422 formed approximately in the center in the front-to-back direction.

[0036] Each first support portion 43 is formed, for example, by bending a single metal plate, such as a galvanized steel sheet.

[0037] The pair of first support parts 43 are arranged to face each other in the front-to-back direction. The upper part of the first support part 43 is connected to the first connecting part 413 of the top plate 41 by screws or the like, and the lower part is connected to the third connecting part 422 of the bottom plate 42. The top plate 41 and the bottom plate 42 are fixed in place by this pair of first support parts 43.

[0038] (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.

[0039] The arm 6 has both longitudinal ends attached to the second support portion 51. This second support portion 51 is connected to the second connecting portion 414 of the top plate 41 by screws or the like. In other words, the arm 6 fixes the top plate 41, bottom plate 42, and first support portion 43 of the holding portion 4 via the second support portion 51.

[0040] As described above, the second connecting portion 414 to which the second support portion 51 is connected is formed approximately in the center of the first protrusion 411 formed in the left-right direction on the top plate 41. Also, the first connecting portion 413 to which the first support portion 43 is fastened is formed approximately in the center of the second protrusion 412 formed in the front-rear direction on the top plate 41. In other words, the arm 6 is connected to the top plate 41 in the left-right direction via the second support portion 51, and the bottom plate 42 is connected to the top plate 41 in the front-rear direction via the first support portion 43. This stabilizes the load balance of the lighting fixture.

[0041] Furthermore, the arm 6 can rotate in the front-to-back direction around the screw 52 when the screw 53 is removed. Through holes 61 are formed at both ends of the arm 6, and after the direction of the lighting fixture is determined, the arm 6 and the second support part 51 can be fixed by fastening the screw 53 through the through holes 61.

[0042] 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 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.

[0043] As described above, the lighting fixture according to this embodiment comprises a light source unit 1 having a light source and attached to a base plate 42, a top plate 41 positioned opposite the base plate 42, a first support portion 43 connecting the base plate 42 and the top plate 41, an arm 6 for fixing the lighting fixture to the ceiling, and a second support portion 51 fastening the top plate 41 and the arm 6. A first connecting portion 413 connecting the first support portion 43 and the top plate 41, and a second connecting portion 414 connecting the second support portion 51 and the top plate 41 are positioned at different locations.

[0044] In this configuration, the arm 6 supports the top plate 41 via the second support part 51, and the first support part 43 supports the bottom plate 42 and the light source unit 1, thus allowing for a reduction in the weight of the first support part 43. Furthermore, as the weight of the first support part 43 is reduced, the number of parts of the first support part 43 positioned between the top plate 41 and the bottom plate 42 can be decreased, thereby improving the heat dissipation performance of the lighting fixture.

[0045] Furthermore, the top plate 41 is rectangular in shape. A first connecting portion 413 is provided on one pair of opposing sides of the top plate 41, and a second connecting portion 414 is provided on the other pair of opposing sides of the top plate 41. This stabilizes the balance of the load of the lighting fixture.

[0046] Furthermore, the second connecting portion 414 protrudes upward from the periphery of the top plate 41 and is connected to the second support portion 51. This allows for a simple connection between the top plate 41 and the second support portion 51.

[0047] (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.

[0048] As shown in Figure 4, the arm 6 may be directly fixed to the top plate 41 without going through the second support portion 51. Specifically, the top plate 41 has a roughly trapezoidal, flat fourth protrusion 415 (protrusion) formed in the left-right direction, replacing the first protrusion 411. In Figure 4, the arm 6 is fastened to the fourth protrusion 415, which corresponds to the second connecting portion, by screws 52 and 53. Even with this configuration, the same effects as in the above embodiment can be obtained.

[0049] Furthermore, multiple light source units may be attached to the lighting fixture. In Figure 5, two light source units 1 are attached to the lighting fixture. By configuring it in this way, the effects of the above embodiment can be obtained while reducing the number of lighting fixtures to be installed.

[0050] In the above embodiment, the first connecting portion 413 is positioned approximately in the center of the top plate 41 in the front-to-back direction, but this is not limited to this configuration. For example, a pair of first connecting portions 413 may be provided at opposite diagonals of the top plate 41. Even with such a configuration, the same effects as in the above embodiment can be obtained. In this case, a pair of second connecting portions 414 may be provided at opposite diagonals from the pair of first connecting portions 413. The arrangement of the first connecting portions 413 and the second connecting portions 414 is not limited to the arrangement described above; it is sufficient that the first connecting portions 413 and the second connecting portions 414 are positioned at different locations on the top plate 41.

[0051] Furthermore, in the above embodiment, the heat dissipation fins 31 are arranged in a radial pattern when viewed from above (see Figure 3), but the arrangement of the heat dissipation fins 31 is not limited to this, and for example, the heat sinks 312 may be arranged so that they are aligned in the left-right or front-back direction when viewed from above. [Industrial applicability]

[0052] 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]

[0053] 1 Light source unit 2 Power supply units 3 Heat dissipation part 31 heat dissipation fins 4 Holding part 41 Top plate 413 1st connection part 414 2nd connection part 42 Bottom plate 422 3rd connection part 43 1st support part 51 Second support part 6 Arms

Claims

1. A light source unit having a light source and attached to the base plate, A top plate is positioned opposite the bottom plate, A first support portion connecting the bottom plate and the top plate, An arm for fixing the light fixture to the ceiling, A second support portion connecting the top plate and the arm Equipped with, The first connecting portion, which connects the first support portion and the top plate, and the second connecting portion, which connects the second support portion and the top plate, are arranged in different positions. The bottom plate and the top plate are rectangular in shape. The first support portion is provided on only one side of the bottom plate and not on two or more sides of the bottom plate. A lighting fixture in which the first connecting portion is provided on a pair of opposing sides of the top plate, and the second connecting portion is provided on another pair of opposing sides of the top plate.

2. The lighting fixture according to claim 1, wherein the second connecting portion protrudes from the peripheral edge of the top plate toward the side opposite to the light source unit and is connected to the second support portion.

3. A light source unit having a light source and attached to the base plate, A top plate is positioned opposite the bottom plate, A first support portion connecting the bottom plate and the top plate, An arm for fixing the light fixture to the ceiling and Equipped with, The first connecting portion, which connects the first support portion and the top plate, and the second connecting portion, which connects the arm and the top plate, are arranged in different positions. The aforementioned arm is a lighting fixture directly connected to the aforementioned top plate.

4. The lighting fixture according to claim 3, wherein the top plate has a protrusion that extends from its peripheral edge toward the side opposite to the light source unit and is fastened with the arm.

5. The lighting fixture according to any one of claims 1 to 4, wherein a power supply unit for supplying power to the light source unit is mounted on the top plate.

6. The lighting fixture according to any one of claims 1 to 5, wherein the bottom plate has a plurality of heat dissipation fins formed on the side opposite to the light source unit.

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