Luminaire

Abstract

To provide a luminaire that secures heat dissipation performance without connecting lighting fixtures.SOLUTION: A luminaire comprises: an arm to be attached to an attachment object part; an arm attachment tool attached to a tip of the arm, and in which an attachment tool opening is formed; a heat sink attached to the arm by the arm attachment tool, and for dissipating heat; and a light emitting part attached to the heat sink, and in which a light emitting element is mounted on a board. The heat sink comprises: a base plate part in contact with the light emitting part; and a heat dissipation plate provided on the base plate part, for dissipating heat generated from the light emitting part, divided into a plurality of pieces on the base plate part, and in which a slit is formed between them. The attachment tool opening of the arm attachment tool exposes the slit.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a lighting fixture with a heat sink for dissipating heat. [Background technology]

[0002] Conventionally, lighting fixtures equipped with heat sinks for dissipating heat have been known. Patent Document 1 discloses a lighting fixture that includes an arm attached to the ceiling, two light-emitting units that emit light, two heat sink units that respectively dissipate heat generated from the two light-emitting units, a power supply unit that supplies power to the two light-emitting units, and a frame unit to which the two heat sink units and the arm are attached. Thus, Patent Document 1 connects two lighting fixtures with the frame unit, and aims to improve heat dissipation. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-181733 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the lighting fixture disclosed in Patent Document 1 requires a separate member called a frame portion in order to connect the two lighting fixtures and improve heat dissipation.

[0005] The present disclosure has been made to solve the above-mentioned problems, and provides a lighting fixture that ensures heat dissipation without connecting lamp fixtures. [Means for solving the problem]

[0006] The lighting fixture according to the present disclosure comprises an arm that is attached to an attachment portion, an arm attachment attached to the tip of the arm and having an attachment opening formed therein, a heat sink that is attached to the arm by the arm attachment and dissipates heat, and a light-emitting portion that is attached to the heat sink and has a light-emitting element mounted on a substrate, the heat sink having a base plate portion that abuts the light-emitting portion, and a heat sink that is provided on the base plate portion and dissipates heat generated from the light-emitting portion and is divided into multiple parts on the base plate portion with slits between each part, and the attachment opening of the arm attachment exposes the slits. [Effects of the Invention]

[0007] According to the present disclosure, the attachment opening of the arm attachment exposes a slit. This allows convection to occur through the slit between the heat sinks and the attachment opening. This allows for efficient dissipation of heat generated from the light-emitting unit. Furthermore, there are no components connecting the lamp. Therefore, heat dissipation can be ensured without connecting the lamp. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is an assembled perspective view showing a lighting fixture according to a first embodiment. [Figure 2] 1 is an exploded perspective view showing a lighting fixture according to a first embodiment. [Figure 3] FIG. 1 is a perspective view showing a heat sink according to a first embodiment. [Figure 4] FIG. 1 is a front view showing a heat sink according to a first embodiment. [Figure 5] FIG. 2 is a perspective view showing a cover according to the first embodiment. [Figure 6] FIG. 2 is a perspective view showing a power supply unit according to the first embodiment. [Figure 7] 1 is a perspective view showing an arm attachment according to a first embodiment. [Figure 8] FIG. 1 is a perspective view showing a heat sink according to a first embodiment. [Figure 9]FIG. 4 is a diagram showing a simulation result of the heat sink according to the first embodiment. [Figure 10] FIG. 10 is a perspective view showing a heat sink according to a comparative example. [Figure 11] FIG. 10 is a diagram showing a simulation result of a heat sink according to a comparative example. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of a lighting device according to the present disclosure will be described with reference to the drawings. Note that the present disclosure is not limited to the embodiments described below. Furthermore, in the following drawings, including FIG. 1, the size relationships between the components may differ from the actual size relationships. Furthermore, in the following description, terms indicating directions are used as appropriate to facilitate understanding, but these terms are for explanatory purposes and do not limit the present disclosure. Examples of terms indicating directions include "up," "down," "right," "left," "front," and "rear."

[0010] Embodiment 1 FIG. 1 is an assembled perspective view showing a lighting fixture 1 according to the first embodiment, and FIG. 2 is an exploded perspective view showing the lighting fixture 1 according to the first embodiment. The lighting fixture 1 is attached to a hanging bolt (not shown) or the like provided on a mounting portion (not shown) such as a ceiling, and irradiates light into a target space. As shown in FIGS. 1 and 2, the lighting fixture 1 includes an arm 200, a light source unit 400, a power supply mounting bracket 801, a power supply unit 901, and an arm mounting tool 701. The lighting fixture 1 is attached to a high ceiling, such as a gymnasium or a warehouse. The outer casing of the lighting fixture 1 is treated to be corrosion-resistant and also has insulating properties. This allows the lighting fixture 1 to withstand use outdoors or in harsh environments.

[0011] (Arm 200) The arm 200 is attached to a suspension bolt (not shown) provided on a mounting portion (not shown). As shown in FIGS. 1 and 2, the arm 200 has an arm horizontal portion 201 and an arm vertical portion 203. The arm horizontal portion 201 is a rectangular flat plate extending in the longitudinal direction, and has a pair of ceiling mounting holes 202 formed therein. The pair of ceiling mounting holes 202 are formed at a pitch of 150 mm, but may be of any other length. The lighting fixture 1 is attached to the ceiling by attaching a suspension bolt to the ceiling mounting holes 202.

[0012] The arm vertical portions 203 extend downward from both longitudinal ends of the arm horizontal portion 201. A pair of arm connection portions 204 are formed on the flat surface of the lower end of the arm vertical portion 203. An arm attachment tool 701 is rotatably attached to the arm connection portions 204 with bolts 301. This allows the light source unit 400 to be attached to a sloped ceiling.

[0013] (Light source unit 400) The light source unit 400 emits light and includes a light emitting section 500, a heat sink 601 that dissipates heat from the light emitting section 500, and a cover 401 that is attached to the heat sink 601 so as to cover the light emitting section 500. The light source unit 400 is provided with an insulating treatment on the outside. Two light emitting sections 500 and two covers 401 are provided.

[0014] (Light emitting unit 500) The light-emitting section 500 includes a plurality of light-emitting elements 502, a light-emitting substrate 501 on which the plurality of light-emitting elements 502 are radially arranged, and a light distribution control member 503 that controls the distribution of light emitted from the light-emitting elements 502.

[0015] (light-emitting element 502) The light emitting element 502 is a surface-mounted pseudo-white LED element that is packaged by disposing a phosphor that converts the wavelength of the blue light to yellow light on an LED chip that emits blue light with a wavelength of, for example, 440 to 480 nm. Note that the light emitting element 502 may be a solid-state laser, a semiconductor laser, an organic electroluminescence (EL) element, an inorganic EL element, or the like. A part of the input power to the light emitting element 502 becomes heat loss, and the heat is transferred to the heat sink 601 via the light emitting substrate 501.

[0016] (Light emitting substrate 501) The light emitting substrate 501 is a circular or regular polygonal wiring substrate. A light emitting element 502 is mounted at least in the center of the light emitting substrate 501, and multiple light emitting elements 502 are mounted over the entire area. A substrate hole 501a is formed in the center of the substrate, and the substrate is attached and fixed to a base plate portion 603 of a heat sink 601 with screws. A metal member with high thermal conductivity, such as an aluminum plate, is used as the light emitting substrate 501.

[0017] (Light distribution control member 503) Light distribution control member 503 has lens base 503a and multiple lenses (not shown). Lens base 503a has substantially the same shape as light emitting substrate 501 of light emitting element 502, and is provided with multiple lenses. The lenses are arranged to face each of the multiple light emitting elements 502, and control the traveling direction of light emitted from light emitting element 502. The lenses are made of resin such as PC (polycarbonate) or PMMA (polymethyl methacrylate).

[0018] (heat sink 601) FIG. 3 is a perspective view showing a heat sink 601 according to the first embodiment. As shown in FIG. 3, the heat sink 601 extends in the longitudinal direction and includes a substantially rectangular base plate portion 603 and a plurality of heat sink plates 602 extending upward from the base plate portion 603. The longitudinal direction of the heat sink 601 is perpendicular to the extension direction of the horizontal arm portion 201 of the arm 200. The heat sink 601 is formed by extruding aluminum, but it does not have to be formed by extrusion. The heat sink 601 may also be formed by attaching the heat sink plates 602, which are made of sheet metal, to the base plate portion 603. The surface of the heat sink 601 is anodized to ensure corrosion resistance and electrical insulation. While anodizing aluminum is preferable because it reduces weight, metals other than aluminum may be used if they have good heat dissipation properties and are chrome-plated or hot-dip galvanized.

[0019] (Base plate part 603) The base plate 603 has a light source mounting surface on the bottom surface to which the light emitting substrate 501 of the light emitting element 502 is attached. That is, the light emitting substrate 501 is attached to one surface, which is the bottom surface, of the base plate 603, and the heat sink 602 is provided on the other surface, which is the top surface. The thickness of the base plate 603 is such that screws can be fixed in place. The base plate 603 has holes formed therein to which the light emitting substrate 501 and the cover 401 are attached.

[0020] (heat sink 602) Heat sink 602 is a plate-like member extending in the vertical direction, and a plurality of them are provided in the form of strips arranged in parallel in the short direction on base plate portion 603. As a result, heat generated from light emitting element 502 is transferred to base plate portion 603, and the heat transferred to base plate portion 603 is dissipated to the outside of lighting device 1 by the plurality of heat sinks 602. Here, the upper end of heat sink 602 forms a power supply mounting surface on which power supply portion 901 is mounted.

[0021] (Slit 604) Fig. 4 is a front view showing a heat sink 601 according to the first embodiment. As shown in Figs. 3 and 4, the heat dissipation plates 602 are divided into a plurality of groups on a base plate, with slits 604 formed between the groups. In the first embodiment, the plurality of heat dissipation plates 602 are divided into two groups. A slit 604 is formed between the two groups. The slit 604 extends in the short direction of the heat sink 601.

[0022] Of the heat sinks 602, the heat sinks 602 located at both ends in the longitudinal direction of the heat sink 601 are formed with power supply screw holes 605 and arm screw holes 606. The power supply screw holes 605 are used when attaching the power supply mounting bracket 801, and four of them are formed on each heat sink 602. The arm screw holes 606 are used when attaching the arm mounting bracket 701, and two of them are formed on each heat sink 602.

[0023] (Cover 401) Fig. 5 is a perspective view showing cover 401 according to the first embodiment. As shown in Fig. 5, cover 401 has glass cover 404, cover main portion 402, and cover flange portion 403. Cover 401 has a sealed structure with respect to light-emitting portion 500, and prevents intrusion or contact of corrosive gases and water. Cover 401 is made of a metal material such as aluminum die-cast (ADC). Cover 401 may also be made of a resin such as polycarbonate (PC) or acrylic (PMMA).

[0024] (Glass cover 404) Glass cover 404 has a substantially square shape, and the four corners are chamfered to form an R. Glass cover 404 is transparent, and allows light emitted from light emitting unit 500 to be irradiated.

[0025] (Main cover part 402) The cover main part 402 is a frame-shaped member that surrounds the outer periphery of the glass cover 404, and is attached to the cover flange part 403 with the glass cover 404 attached.

[0026] (Cover flange 403) The cover flange 403 is a box-shaped, bottomed, rectangular cylindrical box that covers the light emitting element 502 and is fixed to the base plate 603 of the heat sink 601. The cover flange 403 is made of a metal such as an aluminum alloy or a resin such as acrylic diglycol carbonate (ADC). The cover flange 403 is formed with cover screw holes 403a used to attach the heat sink 601. The cover flange 403 is fixed to the heat sink 601 with screws or the like under a predetermined pressure, ensuring waterproof and dustproof performance, such as IP65, a waterproof and dustproof protection standard established by the International Electrotechnical Commission (IEC). In this way, the cover 403, together with the heat sink 601, forms a light emitting storage space that is waterproof and dustproof and that accommodates the light emitting element 502. Note that the cover flange 403 only needs to have the required waterproof and dustproof performance, and is not limited to IP65.

[0027] (Power supply mounting bracket 801) 2, power supply mounting bracket 801 is a member used when mounting power supply unit 901 to heat sink 601. Power supply mounting bracket 801 is a U-shaped member extending in the short direction of heat sink 601. Power supply mounting bracket 801 is attached to heat sink 602 using power supply screw holes 605 in heat sink 602, with power supply unit 901 sandwiched between them. In this way, power supply unit 901 is fixed to heat sink 601. In the first embodiment, two power supply mounting brackets 801 are provided, and power supply unit 901 is fixed to heat sink 601 by the two power supply mounting brackets 801.

[0028] (Power supply section 901) 6 is a perspective view showing a power supply unit 901 according to embodiment 1. The power supply unit 901 has a power supply board 902b that supplies power to the light source unit 400, and is externally insulated. As shown in FIG. 6, the power supply unit 901 has a power supply case 903, a power supply end plate 905, a connector cover 908, power supply components 902, and output wires 906.

[0029] (Power Supply Case 903) The power supply case 903 is a box-shaped case with openings on both end surfaces to prevent the intrusion of water, dust, etc. The power supply board 902b is housed inside the power supply case 903. The power supply case 903 is made of, for example, extruded aluminum. Because the power supply case 903 is made of a material with high thermal conductivity, it is possible to dissipate heat generated from the power supply board 902b to the outside. The power supply case 903 is attached to a power supply attachment surface that is different from the light source attachment surface of the heat sink 601. A case attachment hole 903a, which is a hole for attaching a conductive member 907, is formed on the underside of the power supply case 903. The surface of the power supply case 903 is anodized or painted, and has insulating and corrosion-resistant properties.

[0030] (Power end plate 905) A pair of power supply end plates 905 are provided, each having an insertion opening 421 through which an output wire 906 is inserted. Of the insertion openings 421 on the pair of power supply end plates 905, the insertion opening 421 through which the output wire 906 is not inserted is blocked by a side packing 904. The power supply end plate 905 is attached to the power supply case 903 with screws so as to cover the opening of the power supply case 903, preventing water, dust, etc. from entering the power supply case 903. The power supply end plate 905 has an L-shaped cross section. The power supply end plate 905 is painted or anodized to provide insulation.

[0031] The power supply end plate 905 is made of a metal material such as an aluminum plate, a steel plate, or a stainless steel plate. The power supply end plate 905 is attached to the power supply case 903 via a rubber side packing 904, which presses the side packing 904 against the power supply case 903 with a predetermined pressure, ensuring waterproof and dustproof performance, such as IP65. In this way, the power supply case 903 and the power supply end plate 905 form a power supply storage space that accommodates the power supply board 902b and ensures waterproof and dustproof performance. The bottom surface of the L-shaped power supply end plate 905 is formed with an end plate mounting hole 905a for mounting a conductive member 907. The surface of the power supply end plate 905 is anodized or painted, providing insulation and corrosion resistance.

[0032] (Connector cover 908) The connector covers 908 are a pair of box-shaped members that cover and protect the connectors provided on the pair of power supply end plates 905. The connector covers 908 are attached to the lower ends of the power supply end plates 905.

[0033] (Power supply component 902) The power supply component 902 is a member that supplies power to the light emitting element 502 .

[0034] (Exit line 906) The lead wire 906 is an electric wire that connects an external power supply to the power supply board 902b and supplies power from the external power supply to the power supply board 902b. The lead wire 906 is inserted into an insertion port 421 formed in the power supply end plate 905.

[0035] (Arm attachment 701) Fig. 7 is a perspective view showing an arm attachment 701 according to the first embodiment. As shown in Figs. 1 and 2, the arm attachment 701 is attached to the tip of the arm 200 and rotatably supports the arm 200 and the heat sink 601. The surface of the arm attachment 701 is anodized or painted, and has insulating properties and corrosion resistance. As shown in Fig. 7, the arm attachment 701 has a base 702, an attachment portion 705, and a support portion 707.

[0036] (base 702) The base 702 is a plate-like member having a substantially rectangular shape. The base 702 has a bolt hole 703 and a fixture opening 704 formed therein. The bolt hole 703 is circularly formed on the upper side of the base 702 and is used when a bolt 301 is inserted to attach the base 702 to the arm 200. The fixture opening 704 is rectangularly formed below the bolt hole 703. The fixture opening 704 may also be circular. As shown in FIGS. 1 and 2 , the fixture opening 704 exposes the slits 604 between the two groups of heat sinks 602. The fixture opening 704 also exposes the other side of the base plate 603 on which the heat sinks 602 are provided. The fixture opening 704 may also expose the one side of the base plate 603 on which the light-emitting unit 500 is provided. In the first embodiment, the arm fixture 701 is disposed in the center of the heat sink 601 in the longitudinal direction. As a result, the attachment opening 704 of the base 702 faces the slit 604. The arm attachment 701 is provided between the plurality of light-emitting units 500 that are connected to each other in the longitudinal direction of the heat sink 601.

[0037] (Mounting part 705) The attachment portion 705 is a plate-like member that bends and extends to both sides from both side portions of the base portion 702. In the attachment portion 705, together with the arm screw holes 606 formed in the heat sink 602, heat dissipation screw holes 706 that are used when connecting the arm attachment tool 701 and the heat sink 602 are formed. Three heat dissipation screw holes 706 are formed in the vertical direction, and the upper heat dissipation screw hole 706 and the lower heat dissipation screw hole 706 face the arm screw holes 606.

[0038] (Support part 707) The support portion 707 is a member that extends from the lower portion of the base portion 702 in the short direction of the heat sink 601. In reality, it is configured by bending the lower portion of the base portion 702. The support portion 707 presses one surface side of the base plate portion 603 of the heat sink 601, thereby supporting the heat sink 601.

[0039] FIG. 8 is a perspective view showing heat sink 601 according to embodiment 1, and FIG. 9 is a diagram showing simulation results for heat sink 601 according to embodiment 1. Next, the heat dissipation effect of heat sink 601 according to embodiment 1 will be described. In the case of a conventional heat sink without slits 604, the temperature is 65.6°C. In contrast, heat sink 601 according to embodiment 1 has slits 604 formed in the center, as shown in FIG. 8. In this case, the flow velocity vector of the air flowing around heat sink 601 is as shown in FIG. 9, and the temperature is 65.1°C. In other words, this is 0.5°C lower than that of conventional heat sink 601.

[0040] According to the first embodiment, the attachment opening 704 of the arm attachment 701 exposes the slit 604. This causes convection to occur through the slit 604 between the heat sinks 602 and the attachment opening 704. This allows the heat generated from the light-emitting unit 500 to be efficiently dissipated. Furthermore, there are no members for connecting the lamps. Therefore, heat dissipation can be ensured without connecting the lamps.

[0041] Furthermore, the light emitting unit 500 is attached to one side of the base plate unit 603, and the heat sink 602 is provided on the other side, and the attachment opening 704 of the arm attachment 701 exposes the other side of the base plate unit 603. This makes it easier for air to flow over the surface of the other side of the base plate unit 603, thereby improving the heat dissipation effect.

[0042] FIG. 10 is a perspective view of a heat sink 601a according to a comparative example, and FIG. 11 shows simulation results for the heat sink 601a according to the comparative example. Next, the heat dissipation effect of the heat sink 601a according to the comparative example will be described. As shown in FIG. 10, the heat sink 601a according to the comparative example has a heat dissipation plate 602 divided into three groups, and two slits 604 are formed. In this case, the flow velocity vector of the air flowing around the heat sink 601a is as shown in FIG. 11, and the temperature is 65.8°C. In other words, this is 0.2°C higher than that of a conventional heat sink. Therefore, it can be said that the heat dissipation effect is higher when the slits 604 formed in the heat sink 601 are provided between adjacent light-emitting elements 500 rather than directly above the light-emitting elements 500.

[0043] The above describes in detail preferred embodiments, but the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the claims.

[0044] Various aspects of the present disclosure are summarized below as appendices.

[0045] (Appendix 1) an arm attached to the attachment portion; an arm attachment attached to a tip of the arm and having an attachment opening formed therein; a heat sink attached to the arm by the arm attachment and configured to dissipate heat; a light-emitting unit attached to the heat sink and having a light-emitting element mounted on a substrate, The heat sink is a base plate portion that contacts the light emitting portion; a heat sink provided on the base plate portion for dissipating heat generated from the light emitting portion, the heat sink being divided into a plurality of portions on the base plate portion with slits between each portion; The attachment opening of the arm attachment exposes the slit. Lighting fixtures. (Appendix 2) The base plate portion is The light emitting unit is attached to one side, and the heat sink is provided on the other side, The attachment opening of the arm attachment exposes the other surface of the base plate portion. 1. A lighting fixture as described in Appendix 1. (Appendix 3) The heat sink is It extends in the longitudinal direction, The slit is extending in the short direction of the heat sink 1. A lighting fixture as described in Appendix 1 or 2. (Appendix 4) The arm attachment The heat sink is disposed at a center portion in the longitudinal direction. A lighting fixture as described in Appendix 3. (Appendix 5) A plurality of the light emitting units are provided, The arm attachment The light emitting unit is provided between adjacent light emitting units in the longitudinal direction of the heat sink. 1. A lighting fixture as described in Appendix 3 or 4. [Explanation of symbols]

[0046] 1 lighting fixture, 200 arm, 201 arm horizontal portion, 202 ceiling mounting hole, 203 arm vertical portion, 204 arm connection portion, 301 bolt, 400 light source unit, 401 cover, 402 cover main portion, 403 cover flange portion, 403a cover screw hole, 404 glass cover, 421 insertion port, 500 light emitting portion, 501 light emitting board, 501a board hole, 502 light emitting element, 503 light distribution control member, 503a lens base, 601 heat sink, 601a heat sink, 602 heat sink, 603 base plate portion, 604 slit, 605 power supply screw hole, 606 arm screw hole, 701 arm mounting bracket, 702 base portion, 703 bolt hole, 704 mounting bracket opening, 705 mounting portion, 706 Screw holes for heat dissipation, 707 support part, 801 power supply mounting bracket, 901 power supply part, 902 power supply parts, 902b power supply board, 903 power supply case, 903a case mounting hole, 904 side packing, 905 power supply end plate, 905a end plate mounting hole, 906 lead wire, 907 conductive member, 908 connector cover.

Claims

1. an arm attached to the attachment portion; an arm attachment attached to a tip of the arm and having an attachment opening formed therein; a heat sink attached to the arm by the arm attachment and configured to dissipate heat; a light-emitting unit attached to the heat sink and having a light-emitting element mounted on a substrate, The heat sink is a base plate portion that contacts the light emitting portion; a heat sink provided on the base plate portion for dissipating heat generated from the light emitting portion, the heat sink being divided into a plurality of portions on the base plate portion with slits between each portion; The attachment opening of the arm attachment exposes the slit. Lighting fixtures.

2. The base plate portion is The light emitting unit is attached to one side, and the heat sink is provided on the other side, The attachment opening of the arm attachment exposes the other surface of the base plate portion.

2. The lighting fixture of claim 1.

3. The heat sink is It extends in the longitudinal direction, The slit is extending in the short direction of the heat sink 3. The lighting fixture according to claim 1 or 2.

4. The arm attachment The heat sink is disposed at a center portion in the longitudinal direction.

4. The lighting fixture according to claim 3.

5. A plurality of the light emitting units are provided, The arm attachment The light emitting unit is provided between adjacent light emitting units in the longitudinal direction of the heat sink.

4. The lighting fixture according to claim 3.

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