Luminaire

Abstract

To provide a luminaire that can improve heat dissipation performance of a power supply part without upsizing the power supply part.SOLUTION: A luminaire comprises: a light emitting part; a heat sink part comprising a plate-like base part in which the light emitting part is attached to one surface, and a plurality of fin parts attached to the other surface of the base part; a top plate part arranged opposite to tip parts of the plurality of fin parts, and having heat dissipation performance; a power supply part fixed to the top plate part while leaving a gap between itself and the top plate part, and for supplying electric power to the light emitting part; and a heat transfer part arranged in a space between the top plate part and the power supply part while being in contact with the top plate part and the power supply part.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a lighting fixture including a power supply unit. [Background technology]

[0002] Conventionally, there is a lighting fixture (see, for example, Patent Document 1) that includes a light source unit having a heat-generating element, a power supply unit that is arranged above the light source unit and supplies power to the light source unit, and a heat sink unit that is attached to the light source unit and arranged between the light source unit and the power supply unit and has a plurality of fins. Patent Document 1 discloses a lighting fixture in which a metal plate unit that has an outer shape larger than the power supply unit in a plan view is fixed to the power supply unit and arranged between the heat sink unit and the power supply unit. In Patent Document 1, by arranging the plate unit between the heat sink unit and the power supply unit, the power supply unit is configured to be less susceptible to heat from the heat sink unit, and this prevents heat from the light source unit from being transferred to the power supply unit and causing a rise in the temperature of the power supply unit. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2020-167094 Summary of the Invention [Problem to be solved by the invention]

[0004] Although Patent Document 1 discloses a structure for suppressing a rise in the temperature of the power supply unit due to the heat from the light source being transferred to the power supply unit, it does not consider a structure for dissipating the heat from the power supply unit. One possible way to dissipate the heat from the power supply unit would be to increase the surface area by enlarging the heat-conductive case of the power supply unit, but this would risk increasing the size of the power supply unit.

[0005] The present disclosure has been made in consideration of these points, and aims to provide a lighting fixture that can improve the heat dissipation performance of a power supply unit without increasing the size of the power supply unit. [Means for solving the problem]

[0006] The lighting device according to the present disclosure comprises a light-emitting unit, a plate-shaped base unit on one side of which the light-emitting unit is attached, and a heat sink unit having a plurality of fin units attached to the other side of the base unit, a top plate unit having heat dissipation properties and arranged opposite the tips of the plurality of fin units, a power supply unit fixed to the top plate unit with a gap between it and the top plate unit and supplying power to the light-emitting unit, and a heat transfer unit arranged in the space between the top plate unit and the power supply unit while in contact with the top plate unit and the power supply unit. [Effects of the Invention]

[0007] According to the present disclosure, a top plate portion is disposed opposite the tip end of the fin portion of the heat sink portion, and a heat transfer portion is provided between the top plate portion and a power supply portion disposed across a space from the top plate portion, in contact with the top plate portion and the power supply portion. Therefore, heat generated from the power supply portion can be transferred to the top plate portion by the heat transfer portion and dissipated from the top plate portion. As a result, heat dissipation can be improved without increasing the size of the power supply portion. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view of a lighting fixture according to a first embodiment. [Figure 2] 1 is an exploded perspective view of a lighting fixture according to a first embodiment, as viewed from below. [Figure 3] 1 is an exploded perspective view of a lighting fixture according to a first embodiment, viewed from above. [Figure 4] FIG. 2 is a perspective view of a heat sink portion of the lighting fixture according to the first embodiment. [Figure 5] 3 is a perspective view of a fin portion of a heat sink portion of the lighting fixture according to the first embodiment. FIG. [Figure 6] 2 is a perspective view of the frame of the lighting fixture according to the first embodiment, viewed from the inside. FIG. [Figure 7] 2 is a perspective view of the frame of the lighting fixture according to the first embodiment, viewed from the outside. FIG. [Figure 8] 2 is a perspective view of a top panel of the lighting fixture according to the first embodiment. FIG. [Figure 9] FIG. 2 is a perspective view of a heat transfer section of the lighting fixture according to the first embodiment. [Figure 10] 3 is a side view of a heat transfer section of the lighting fixture according to the first embodiment. FIG. [Figure 11] 1 is a side view of a lighting fixture according to a first embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] FIG. 1 is a perspective view of a lighting fixture 80 according to the first embodiment. FIG. 2 is an exploded perspective view of the lighting fixture 80 according to the first embodiment, as seen from below. FIG. 3 is an exploded perspective view of the lighting fixture 80 according to the first embodiment, as seen from above. FIG. 4 is a perspective view of the heat sink 13 of the lighting fixture 80 according to the first embodiment. FIG. 5 is a perspective view of the fin portion 132 of the heat sink 13 of the lighting fixture 80 according to the first embodiment. FIG. 6 is a perspective view of the frame portion 82 of the lighting fixture 80 according to the first embodiment, as seen from the inside. FIG. 7 is a perspective view of the frame portion 82 of the lighting fixture 80 according to the first embodiment, as seen from the outside. FIG. 8 is a perspective view of the top panel portion 84 of the lighting fixture 80 according to the first embodiment. FIG. 9 is a perspective view of the heat transfer portion 86 of the lighting fixture 80 according to the first embodiment. FIG. 10 is a side view of the heat transfer portion 86 of the lighting fixture 80 according to the first embodiment. FIG. 11 is a side view of the lighting fixture 80 according to the first embodiment. In FIG. 11, the power supply leg 8513 of the power supply device 85 and the arm 20 are omitted from the illustration.

[0010] The lighting fixture 80 will be described below with reference to FIGS. 1 to 11. In each drawing, identical or corresponding parts are denoted by the same reference numerals, and their description will be omitted or simplified as appropriate. The shape, size, and arrangement of the components shown in each drawing may be modified as appropriate within the scope of this disclosure. In each drawing, arrow X indicates the width direction of the lighting fixture 80, arrow Y indicates the depth direction of the lighting fixture 80, and arrow Z indicates the vertical direction, which is the height direction of the lighting fixture 80. In the width direction X, X1 indicates the right direction, and X2 indicates the left direction. In the depth direction Y, Y1 indicates the front direction, and Y2 indicates the rear direction. In the vertical direction Z, Z1 indicates the upward direction, and Z2 indicates the downward direction. These directions will be used as appropriate in the following description. For ease of explanation, these directions may be omitted and the term "top" or "bottom" may be used.

[0011] The lighting fixture 80 has a light source unit 81, a connecting unit 14, a frame unit 82, a top panel unit 84, a power supply unit 85, a heat transfer unit 86, and an arm 20. As shown in Figures 2 and 3, the light source unit 81 has a light-emitting unit 11, a cover unit 12, and a heat sink unit 13. The lighting fixture 80 has two light source units 81, which are arranged with an interval in the depth direction Y.

[0012] The light-emitting unit 11 includes a plurality of light-emitting elements 111 and a substrate 112 on which the plurality of light-emitting elements 111 are mounted. The substrate 112 is a flat electronic substrate. The plurality of light-emitting elements 111 are mounted on a mounting surface 1121 (see FIG. 2), which is one surface of the substrate 112. The substrate 112 is also provided with wiring conductors (not shown) that electrically connect electrodes of the plurality of light-emitting elements 111. The substrate 112 is also provided with a power supply terminal (not shown) on its outer periphery. The board terminal is provided so as to be located toward the center of the lighting fixture 80, and is located on the rearward Y2 side of the substrate 112 on the Y1 side in FIG. 2. An end of a secondary power line portion 8512 extending from a power supply device 85 is connected to the board terminal so as to receive power from the power supply device 85.

[0013] The cover portion 12 is made of a transparent material and protects the light-emitting portion 11. The cover portion 12 is attached to a base portion 131 (described later) of the heat sink portion 13 so as to cover the light-emitting portion 11. The cover portion 12 has a box-shaped cover main portion 121 that is open on the upward direction Z1 side, and a cover flange portion 122 that protrudes in the horizontal direction XY from the periphery of the opening of the cover main portion 121. A cover through-hole 123 is formed in the cover flange portion 122 for fixing the cover portion 12 to the base portion 131. Note that the cover portion 12 may be provided with a lens on the surface of the cover main portion 121 facing the light-emitting portion 11, for controlling the light from the light-emitting element 111 to have a predetermined light distribution.

[0014] The heat sink 13 transfers heat generated when the light emitting unit 11 emits light and dissipates the transferred heat. The heat sink 13 is formed by processing a plate-shaped metal member. The metal member is, for example, iron, stainless steel, or aluminum. However, using aluminum makes it lighter than iron and stainless steel and improves heat dissipation. Here, it is assumed that the heat sink 13 is made of aluminum. The heat sink 13 has a base 131 and fins 132. As shown in FIG. 4 , the base 131 has a rectangular base main portion 1311 and a base flange 1312 extending downward from the outer edge of the base main portion 1311. The base 131 is formed by bending a plate material using a press or other method.

[0015] At the center of each of the four sides of the base main portion 1311, a base through-hole 1313 for fixing the base portion 131 to the frame portion 82 or the connecting portion 14 is formed.

[0016] The lower surface of the base main portion 1311 is a light source attachment portion 1311a to which the light emitting portion 11 is attached. The light emitting portion 11 is attached to the light source attachment portion 1311a. Specifically, the light emitting portion 11 is attached to the light source attachment portion 1311a so that the surface of the light emitting portion 11 opposite to the mounting surface 1121 abuts against the light source attachment portion 1311a. The upper surface of the base main portion 1311 is a fin attachment portion 1311b to which the fin portion 132 is attached. A plurality of fin portions 132 are attached to the fin attachment portion 1311b.

[0017] The base main portion 1311 is provided with a base electric wire insertion portion (not shown) through which a secondary power supply line portion 8512 (see FIGS. 2 and 3) extending from the power supply device 85 is inserted. The base electric wire insertion portion is an opening that penetrates the base main portion 1311 in the up-down direction Z. When the light emitting unit 11 is attached to the base main portion 1311, the base electric wire insertion portion is provided adjacent to a board terminal (not shown) of the light emitting unit 11 in a plan view. Note that in FIG. 4, the base electric wire insertion portion is provided on the rearward direction Y2 side. An end of the secondary power supply line portion 8512 that has passed through a wire opening 8412 (see FIG. 8) of the top plate portion 84 is inserted into the base electric wire insertion portion, and the end of the secondary power supply line portion 8512 is connected to a board terminal (not shown) provided on the outer periphery of the board 112.

[0018] The base flange 1312 is a portion that protrudes downward in the Z2 direction from each side edge of the base main part 1311. The base flange 1312 is disposed perpendicular to the base main part 1311 and reinforces the rigidity of the base main part 1311. The base flange 1312 has two flange main parts 1312a disposed at a distance from one side edge of the base main part 1311. The area between the two flange main parts 1312a forms a fitting part 1312b into which a cover holding part 822 (see FIG. 1) of the frame part 82 (described later) or a cover holding part 142 (see FIG. 1) of the connecting part 14 (described later) is fitted. Because the base flange 1312 protrudes downward in the Z2 direction from the base main part 1311, accumulation of dust or water on the base main part 1311 can be suppressed compared to when the base flange 1312 protrudes upward in the Z1 direction.

[0019] As shown in FIG. 5 , the fin section 132 has a fin fixing section 1321, a first heat dissipation fin 1322, and a second heat dissipation fin 1323. The fin fixing section 1321 is a rectangular plate. The first heat dissipation fin 1322 and the second heat dissipation fin 1323 extend perpendicularly to the fin fixing section 1321 from two opposing short sides of the fin fixing section 1321. The first heat dissipation fin 1322 and the second heat dissipation fin 1323 are formed in a plate shape and protrude upward in the Z1 direction perpendicular to the base main section 1311 when the fin section 132 is attached to the fin mounting section 1311b. The fin fixing section 1321 is fixed to the fin mounting section 1311b by a fixing means such as a screw or crimping.

[0020] The multiple fins 132 are arranged circumferentially on the fin mounting portion 1311b of the base portion 131, with the center of the fin mounting portion 1311b as the center. The fins 132 are arranged with a gap between adjacent fins 132 in the circumferential direction. In a plan view, the fins 132 are arranged so as to intersect with lines extending radially from the center of the fin mounting portion 1311b. No fins 132 are arranged in the center of the fin mounting portion 1311b, and a space where no fins 132 are arranged is provided on the upward Z1 side of this center. Note that, here, an example is shown in which the heat sink portion 13 is composed of two parts, the base portion 131 and the fins 132. However, the base portion 131 and the fins 132 may be integrally formed by aluminum extrusion, casting, forging, or the like.

[0021] The frame 82 connects the two light source units 81 and the top plate 84, and is disposed on both sides of the heat sink 13 in the width direction X, as shown in FIGS. 1 to 3. As shown in FIGS. 6 and 7, the frame 82 includes a connecting base fixing portion 821 that forms the lower surface, a cover holding portion 822, frame pillar portions 823 that form the side surfaces, and a connecting top plate fixing portion 824 that forms the upper surface. The frame 82 may be made of a metal member having higher strength than the base 131, such as iron or stainless steel. Furthermore, by using a material with high thermal conductivity, such as aluminum, it is possible to improve heat dissipation capacity.

[0022] The connecting base fixing portion 821 is formed in a rectangular shape that is long in the depth direction Y. Connecting portion fixing portions 8211 are provided on both ends of the connecting base fixing portion 821 in the depth direction Y. The connecting portion fixing portions 8211 are holes for fixing the frame portion 82 to the light source portion 81. The hole that constitutes the connecting portion fixing portion 8211 is a hole that penetrates the connecting base fixing portion 821 in the up-down direction Z, and a spiral groove is formed on the inner surface of the hole. There are two connecting portion fixing portions 8211 corresponding to the two light source portions 81.

[0023] 2, the screw-shaped cover fixing member 40 is inserted from the downward direction Z2 into the cover through-hole 123 of the cover unit 12 and the base through-hole 1313 of the heat sink unit 13. Then, the tip of the cover fixing member 40 is screwed into the connecting unit fixing portion 8211 of the connecting base fixing portion 821, thereby fixing the light source unit 81 to the frame unit 82 integrally.

[0024] As shown in FIGS. 6 and 7 , the cover holding portion 822 is provided to protrude downward in the Z2 direction from the rectangular frame column portion 823 and extends downward in the Z2 direction further than the connecting base fixing portion 821. Two cover holding portions 822 are provided at an interval in the depth direction Y corresponding to the two light source units 81. Each cover holding portion 822 has a holding vertical portion 8221 extending downward in the Z2 direction and a holding horizontal portion 8222 extending perpendicularly to the holding vertical portion 8221 from the lower end of the holding vertical portion 8221. As shown in FIG. 1 , when the frame unit 82 is attached to the light source unit 81, the holding vertical portion 8221 is fitted into the fitting portion 1312b of the heat sink unit 13. The upper surface of the holding horizontal portion 8222 abuts against the lower surface of the cover flange portion 122 of the light source unit 81, preventing the cover unit 12 from falling.

[0025] 6 and 7, the frame pillar portion 823 is formed in a rectangular shape, and is formed to extend upward in the Z1 direction from an end portion in the short side direction (an end portion in the width direction X) of the connecting base fixing portion 821. The frame pillar portion 823 has a pillar center portion 8231, a support pillar portion 8232, and a component mounting pillar portion 8233.

[0026] The pillar central portion 8231 is provided near the center of the frame portion 82 in the depth direction Y, and is a portion to which the arm 20 is attached. The pillar central portion 831 is formed in a rectangular shape, and has a pillar connection portion 8231a to which the connection member 30 (see FIGS. 1 to 3) is connected. The pillar connection portion 8231a is configured as a cylindrical protrusion that protrudes from the right direction X1 side, which is the outside of the pillar central portion 8231, toward the left direction X2, which is the inside. A spiral groove is formed on the inner surface of the pillar connection portion 8231a.

[0027] The support pillars 8232 are provided on both ends of the frame 82 in the depth direction Y, and are provided so as to connect the base 131 of the heat sink 13 and the top plate 84 together.

[0028] The component mounting column 8233 is provided between the column center portion 8231 and one of the support column portions 832 in the depth direction Y. The component mounting column 8233 is provided with a component mounting hole 8233a to which a functional component such as a communication unit (not shown) or a sensor (not shown) is attached.

[0029] The connecting top plate fixing portion 824 is formed to extend perpendicularly from the end of the frame pillar portion 823 in the upward direction Z1 relative to the frame pillar portion 823. The connecting top plate fixing portion 824 is rectangular and long in the depth direction Y, and top plate fixing portions 8241 are provided at both ends in the depth direction Y. In addition, the connecting top plate fixing portion 824 is provided with two heat transfer portion fixing portions 8242 located more inward than the two top plate fixing portions 8241. The heat transfer portion fixing portion 8242 and the top plate fixing portion 8241 are holes that penetrate in the vertical direction Z, and have a spiral groove formed on their inner surfaces.

[0030] As shown in FIGS. 1 to 3 , the connecting portions 14 are disposed on both sides of the heat sink 13 in the depth direction Y and, together with the frame 82, connect the two light source units 81 and the top plate 84. Like the frame 82, the connecting portions 14 may be made of a metal member with higher strength than the base 131, such as iron or stainless steel. Furthermore, using a material with high thermal conductivity, such as aluminum, can improve heat dissipation capabilities. As shown in FIGS. 2 and 3 , the connecting portion 14 includes a connecting base fixing portion 141, a cover holding portion 142, a frame column 143, and a connecting top plate fixing portion 144. The connecting base fixing portion 141, the cover holding portion 142, the frame column 143, and the connecting top plate fixing portion 144 of the connecting portion 14 have the same configurations as the corresponding portions of the frame 82.

[0031] When fixing the connecting portion 14 to the light source unit 81, first, the screw-shaped cover fixing member 40 is inserted from the downward direction Z2 into the cover through-hole 123 of the cover unit 12 and the base through-hole 1313 of the heat sink unit 13. Then, the tip of the cover fixing member 40 is screwed into the connecting portion fixing portion 1411 of the connecting base fixing portion 141 of the connecting portion 14, thereby fixing the connecting portion 14 integrally to the light source unit 81. Furthermore, with the light source unit 81 fixed to the connecting portion 14, the holding vertical portion 1421 of the cover holding portion 142 is fitted into the fitting portion 1312b of the heat sink unit 13. Then, the upper surface of the holding horizontal portion 1422 abuts against the lower surface of the cover flange portion 122 of the light source unit 81, preventing the cover unit 12 from falling.

[0032] The arm 20 is a member for fixing the lighting fixture 80 to a mounting portion such as a ceiling, and is made of a strong plate-like metal member such as iron or stainless steel. As shown in FIGS. 1 to 3 , the arm 20 has an arm main portion 21 that abuts against the mounting portion, and arm support portions 22 that extend downward in the Z2 from both ends of the arm main portion 21 and hold the light source portion 81. A through hole 22a is formed in the lower end of each arm support portion 22, through which the connecting member 30 is inserted. The lower end of each arm support portion 22 of the arm 20 is disposed outside the two frame portions 82 in the width direction X, and the connecting member 30 is inserted into the through hole 22a of the arm support portion 22 and screwed into the column connecting portion 8231a of the frame portion 82, thereby attaching the arm 20 to the light source portion 81.

[0033] The top plate portion 84 is disposed opposite the tip of the fin portion 132 so as to protect the heat sink portion 13. As shown in Fig. 8, the top plate portion 84 is formed in an oval shape and has a top plate main portion 841 that covers the two light source portions 81 from the upward direction Z1 side, and a plurality of top plate connecting portions 842 that protrude outward in the horizontal direction XY from the outer periphery of the top plate main portion 841. The top plate portion 84 is formed by pressing a plate made of a material such as aluminum that has good heat dissipation properties and is lighter than iron, for example.

[0034] The top plate main portion 841 has a plurality of top plate openings 8411 and one electric wire opening 8412 for each of the two light source units 81. The top plate openings 8411 and the electric wire openings 8412 are through holes that penetrate the top plate main portion 841. The top plate openings 8411 are provided to dissipate heat from the heat sink unit 13. The plurality of top plate openings 8411 are arranged concentrically in two separate locations in the depth direction Y of the top plate main portion 841 to correspond to the two light source units 81. Each of the plurality of top plate openings 8411 is arranged opposite an end edge of the fin unit 132 of the heat sink unit 13 on the upward Z1 side.

[0035] In FIG. 8, the wire opening 8412 is formed in a circular shape at one location near the center of the top panel portion 84 in the X and Y directions.

[0036] The top plate main portion 841 is also provided with a power supply fixing portion 8413 for fixing the power supply device 85. The power supply fixing portion 8413 is formed with a cylindrical protrusion that protrudes downward in the Z2 direction from the top plate main portion 841, and a spiral groove is formed on the inner surface of the power supply fixing portion 8413. The top plate main portion 841 is also formed with a heat transfer portion fixing portion 8414 for fixing the heat transfer portion 86. The heat transfer portion fixing portion 8414 is formed with a through-hole that penetrates the top plate main portion 841 in the up-down direction Z.

[0037] The top plate connecting portion 842 is a portion for fixing the top plate portion 84 to the frame portion 82 and the connecting portion 14. A top plate through-hole 8421 that penetrates in the up-down direction Z is formed in the top plate connecting portion 842. The top plate connecting portion 842 of the top plate portion 84 is placed on the connecting top plate fixing portion 824 of the frame portion 82 and the connecting top plate fixing portion 144 of the connecting portion 14. A screw-shaped top plate fixing member 50 (see FIGS. 1 and 3) is inserted into the top plate through-hole 8421 from the upward direction Z1 side and screwed into the top plate fixing portion 8241 of the frame portion 82 and the top plate fixing portion 1441 of the connecting portion 14, thereby fixing the top plate portion 84 to the connecting portion 14 and the frame portion 82.

[0038] The power supply device 85 converts power supplied from an external source and supplies power to control the lighting of the light-emitting units 11 of the two light source units 81, and is arranged to face the top panel unit 84. The power supply device 85 has a long box shape and is arranged so that its longitudinal direction is along the depth direction Y. The power supply device 85 is arranged so as to overlap the two light source units 81 in the up-down direction Z. The power supply device 85 has a power supply unit 851 that houses electronic components, and an electric wire cover unit 852.

[0039] The case of the power supply unit 851 is formed in a long box shape. The case of the power supply unit 851 is formed into a rectangular tube shape by aluminum extrusion molding, but it may also be formed into a box shape by fastening metal sheets together. A light-emitting circuit unit 8514 (see FIG. 11) is housed inside the case of the power supply unit 851. One end of a primary power supply line unit 8511 extending from outside the power supply unit 851 to inside the power supply unit 851 is connected to the light-emitting circuit unit 8514 as shown in FIGS. 1 to 3. The part of the primary power supply line unit 8511 outside the power supply unit 851 protrudes from the side surface of the power supply unit 851 on the forward direction Y1 side, and the other end of the primary power supply line unit 8511 is connected to an external power supply such as a commercial power supply.

[0040] One end of the secondary power supply line 8512 is connected to the light-emitting circuit section 8514. The other end of the secondary power supply line 8512, the part outside the power supply section 851, protrudes from the side surface of the power supply section 851 on the forward direction Y1 side, and is then routed along the bottom surface of the power supply section 851. The other end of the secondary power supply line 8512 is inserted through an electric wire opening 8412 (see FIGS. 2 and 3) of the top plate section 84 and a base electric wire insertion section of the base section 131, and is connected to a board terminal (not shown) provided on the board 112.

[0041] Power is supplied to the light-emitting circuit unit 8514 from an external power source such as a commercial power source via a primary power supply line unit 8511. The light-emitting circuit unit 8514 converts the supplied power into a current required to light the light-emitting unit 11. The converted current is supplied to the light-emitting unit 11 via a board terminal by a secondary power supply line unit 8512 connected to the light-emitting circuit unit 8514. This causes the light-emitting unit 11 to emit light.

[0042] The power supply legs 8513 are plate-shaped portions for fixing the power supply device 85 to the top plate 84. The power supply legs 8513 are provided on both ends of the power supply unit 851 in the depth direction Y and are fixed to the power supply unit 851 by screws or the like. The power supply legs 8513 fix the power supply unit 851 to the top plate 84 with a gap between them. As shown in FIGS. 2 and 3 , the power supply legs 8513 have a plate-shaped side plate 8513a facing the end face of the power supply unit 851 in the depth direction Y, and legs 8513b extending from the lower end of the side plate 8513a in the depth direction Y in the opposite direction to the power supply unit 851. The lower surfaces of the legs 8513b of the power supply legs 8513 abut against the upper surface of the top plate 84. A screw-shaped power supply fixing member (not shown) is inserted into a through hole 8513c formed in the leg portion 8513b and screwed into the power supply fixing portion 8413 formed on the top plate portion 84, thereby fixing the power supply leg portion 8513 to the top plate portion 84.

[0043] When the power supply leg portion 8513 is fixed to the power supply unit 851, the leg portion 8513b is positioned below the lower surface of the power supply unit 851. As a result, the power supply unit 851 is disposed with a space between it and the top panel portion 84.

[0044] The wire cover part 852 covers the secondary power line part 8512 protruding from the side surface of the power supply part 851 on the forward Y1 side, and has a box shape with two openings on the bottom and on the surface facing the power supply part 851. By covering the secondary power line part 8512 with the wire cover part 852, the power supply device 85 can prevent the secondary power line part 8512 from being exposed to the outside.

[0045] The heat transfer portions 86 thermally connect the top plate portion 84 and the power supply device 85, and are arranged in pairs spaced apart in the width direction X in the space between the top plate portion 84 and the power supply device 85. The heat transfer portions 86 are formed by bending a metal sheet having good heat dissipation properties, such as aluminum.

[0046] As shown in FIGS. 9 and 10 , the heat transfer unit 86 has a rising portion 862 that extends at an angle relative to the top plate portion 84, which is the fixing surface, and extending portions that extend in opposite directions from both ends of the rising portion 862 in the direction of the angle. The heat transfer unit 86 is configured in a generally Z-shape as a whole and is elastically deformable in the height direction of the Z-shape (the up-down direction Z). One of the two extending portions of the heat transfer unit 86 is a fixed portion 861 that is fixed to the top plate portion 84 by a fixing member 60 (see FIG. 1 ), and the other of the two extending portions is a non-fixed portion 863 that is not fixed to the power supply device 85. The fixed portion 861 has a through-hole 8611 that penetrates in the Z direction. In addition, the heat transfer unit 86 has a notch 8612 formed in a part of the fixed portion 861 so as not to cover the top plate opening 8411 from above.

[0047] The heat transfer section 86 is fixed to the top plate section 84 by inserting a fixing member 60 such as a screw into the through hole 8611 of the fixing section 861 and the heat transfer section fixing section 8414 of the top plate section 84, and screwing it into the heat transfer section fixing section 8242 of the frame section 82.

[0048] The heat transfer portion 86 is formed such that its height Za in the up-down direction Z (see FIG. 10) is greater than the distance Zb (see FIG. 11) between the top plate portion 84 and the power supply portion 851 in the up-down direction Z. Furthermore, the non-fixed portion 863 of the heat transfer portion 86 is inclined such that the free end 863a of the non-fixed portion 863 is inclined in a direction away from the fixed portion 861 in the height direction of the Z shape, i.e., inclined upward Z1. Therefore, when the power supply device 85 is fixed from above to the top plate portion 84 to which the heat transfer portion 86 has already been fixed, the heat transfer portion 86 is elastically deformed by being pressed downward Z2 by the power supply portion 851, and the non-fixed portion 863 is pressed against the power supply portion 851 of the power supply device 85, thereby coming into surface contact with the power supply portion 851. In this way, the heat transfer portion 86 is in surface contact with the power supply portion 851 of the power supply device 85 and the fixed portion 861 is in surface contact with the top plate portion 84, thereby facilitating the transfer of heat from the power supply device 85 from the heat transfer portion 86 to the top plate portion 84.

[0049] Furthermore, since the heat transfer portion 86 is elastically deformable in the vertical direction Z, even if the height of the raised portion 862 is formed to be greater than the distance Zb, the entire heat transfer portion 86 is elastically deformed when the power supply device 85 is fixed, thereby preventing the fixation of the power supply device 85 from being hindered.

[0050] The heat transfer unit 86 may be configured such that the non-fixed portion 863 is not inclined but is parallel to the fixed portion 861. In this case, the height Za of the heat transfer unit 86 in the vertical direction Z is set to be equal to or greater than the distance Zb in the vertical direction Z between the top plate portion 84 and the power supply unit 851. This allows the non-fixed portion 863 of the heat transfer unit 86 to be in surface contact with the power supply unit 851 and the fixed portion 861 to be in surface contact with the top plate portion 84, making it easier to transfer heat from the power supply device 85 from the heat transfer unit 86 to the top plate portion 84.

[0051] The first embodiment can provide the following effects. (1) The lighting fixture 80 is provided with a heat transfer section 86 that is in contact with the top plate section 84 and the power supply section 851, and is located between the top plate section 84 that is disposed above the heat sink section 13 and the power supply section 851 that is disposed above the top plate section 84 with a space therebetween. Because the lighting fixture 80 is provided with the heat transfer section 86, heat from the power supply section 851 can be transferred to the top plate section 84 by the heat transfer section 86 and dissipated from the top plate section 84. In addition, a space is provided between the top plate section 84 and the power supply section 851, and this space acts as a heat dissipation space. As a result, the lighting fixture 80 can improve heat dissipation without increasing the size of the power supply section 851.

[0052] (2) The top plate 84 is provided with a top plate opening 8411 that penetrates the top plate 84. This allows heat from the heat sink 13 to be dissipated through the top plate opening 8411, and prevents heat from the light source 81 from being transmitted to the power supply 851.

[0053] (3) In the longitudinal direction of the power supply unit 851, the length of the heat transfer unit 86 is formed to be shorter than the length of the power supply unit 851. This allows the heat transferred from the light source unit 81 to the heat transfer unit 86 to be dissipated without being trapped between the power supply unit 851 and the top plate unit 84. In addition, a gap can be provided between the heat transfer unit 86 and the power supply legs 8513 to allow heat generated in the power supply device 85 to escape, thereby improving the heat dissipation performance of the power supply device 85.

[0054] (4) Heat transfer unit 86 is provided separately from top panel 84 and power supply 85. Therefore, lighting device 80 can adjust its heat dissipation capacity by attaching or detaching heat transfer unit 86 in accordance with the degree of heat generation from power supply 85 (the amount of light emitted by light-emitting unit 11). In other words, lighting device 80 can easily adjust its heat dissipation capacity by removing heat transfer unit 86 when power supply 85 generates little heat, and attaching heat transfer unit 86 to promote heat dissipation when power supply 85 generates a lot of heat.

[0055] (5) Heat transfer section 86 is configured in a Z-shape as a whole, and non-fixed section 863 and fixed section 861 are elastically deformed to be pressed against power supply section 851 and top panel section 84, making surface contact with each other. Therefore, in lighting device 80, heat from power supply device 85 is easily transferred to heat transfer section 86, and the heat dissipation properties of power supply device 85 can be improved.

[0056] (6) The non-fixed portion 863 of the heat transfer unit 86 is inclined so that the free end 863a faces upward in the Z1 direction. Therefore, when the power supply device 85 is fixed to the top plate 84, the heat transfer unit 86 is pressed by the power supply unit 851 and elastically deforms, and the non-fixed portion 863 is pressed against the power supply unit 851 of the power supply device 85, making surface contact with the power supply unit 851. Therefore, in the lighting device 80, heat from the power supply device 85 is easily transferred to the heat transfer unit 86, and the heat dissipation of the power supply device 85 can be improved.

[0057] Although the above describes a configuration in which heat transfer unit 86 is fixed to top plate unit 84, it may be fixed to power supply unit 851. In this case, heat transfer unit 86 shown in FIG. 10 is turned upside down, and fixing unit 861 is fixed to power supply unit 851.

[0058] Although the above describes a configuration in which a pair of heat transfer sections 86 are arranged in the X direction, a configuration in which a pair of heat transfer sections 86 are arranged in the Y direction is also possible. Also, a configuration in which a pair of heat transfer sections 86 are integrally formed is also possible. Furthermore, lighting device 80 may be configured to include only one of the pair of heat transfer sections 86. [Explanation of symbols]

[0059] 11 light-emitting portion, 12 cover portion, 13 heat sink portion, 14 connecting portion, 20 arm, 21 arm main portion, 22 arm support portion, 22a through hole, 30 connecting member, 40 cover fixing member, 50 top plate fixing member, 60 fixing member, 80 lighting fixture, 81 light source portion, 82 frame portion, 84 top plate portion, 85 power supply unit, 86 heat transfer portion, 111 light-emitting element, 112 substrate, 121 cover main portion, 122 cover flange portion, 123 cover through hole, 131 base portion, 132 fin portion, 141 connecting base fixing portion, 142 cover holding portion, 143 frame pillar portion, 144 connecting top plate fixing portion, 821 connecting base fixing portion, 822 cover holding portion, 823 frame pillar portion, 824 connecting top plate fixing portion, 831 Pillar center portion, 832 support column portion, 841 top plate main portion, 842 top plate connecting portion, 851 power supply portion, 852 electric wire cover portion, 861 fixed portion, 862 rising portion, 863 non-fixed portion, 863a free end, 1121 mounting surface, 1311 base main portion, 1311a light source mounting portion, 1311b fin mounting portion, 1312 base flange portion, 1312a flange main body portion, 1312b fitting portion, 1313 base through hole, 1321 fin fixing portion, 1322 first heat dissipation fin, 1323 second heat dissipation fin, 1411 connecting portion fixing portion, 1421 holding vertical portion, 1422 holding horizontal portion, 1441 top plate fixing portion, 8211 connecting portion fixing portion, 8221 Vertical holding part, 8222 horizontal holding part, 8231 central part of the column, 8231a column connection part, 8232 support column part, 8233 part mounting column part, 8233a part mounting hole, 8241 top plate fixing part, 8242 heat transfer part fixing part, 8411 top plate opening, 8412 opening for electric wire, 8413 power supply fixing part, 8414 heat transfer part fixing part, 8421 top plate through hole, 8511 primary power supply line part, 8512 secondary power supply line part, 8513 power supply leg part, 8513a side plate part, 8513b leg part, 8513c through hole, 8514 light emitting circuit part, 8611 through hole, 8612 notch.

Claims

1. A light-emitting portion; a heat sink portion having a plate-shaped base portion on one surface of which the light emitting portion is attached and a plurality of fin portions attached to the other surface of the base portion; a top plate portion having heat dissipation properties and arranged opposite to the tips of the plurality of fin portions; a power supply unit fixed to the top plate portion with a gap therebetween and supplying power to the light-emitting unit; a heat transfer section disposed in a space between the top plate section and the power supply section while being in contact with the top plate section and the power supply section.

2. The heat transfer portion is The lighting fixture according to claim 1 , wherein the top plate and the power supply unit are in surface contact with each other in a state where the top plate and the power supply unit are elastically deformed in a direction penetrating the top plate and the power supply unit.

3. The heat transfer portion is The lighting fixture according to claim 1 , wherein the lighting fixture is fixed between the top plate and the power supply unit in a state where the lighting fixture is elastically deformed in a direction penetrating the top plate and the power supply unit.

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