Luminaire

Abstract

To obtain a luminaire that comprises a heat sink, has a simple structure for holding and positioning a power supply board, and improves assemblability.SOLUTION: A luminaire comprises: a light source board on which a light source is mounted; a plate-like heat sink base to which the light source board is attached on one surface side, and in which at least one concave part is formed; a cylindrical heat sink arranged on the other surface side of the heat sink base, and in which an opening is formed in an end part on the arrangement side of the heat sink base; a power supply board for supplying electric power to the light source; and a case comprising a mounting surface part extending so as to be orthogonal to the heat sink base, and on which the power supply board is mounted, and housed in the heat sink. In the mounting surface part of the case, a first convex part inserted into the at least one concave part is formed so as to protrude from an end part on the arrangement side of the heat sink base.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to a lighting fixture that is attached to a mounting portion such as a ceiling. [Background technology]

[0002] Conventionally, lighting fixtures that are inserted into a recessed hole formed in a mounting portion such as a ceiling are known (see, for example, Patent Document 1). The lighting fixture of Patent Document 1 is a downlight in which a power supply board is disposed inside a heat sink of a cylindrical member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-213168 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the lighting fixture of Patent Document 1, a power supply board is held inside a container housed in a housing. The power supply board in the lighting fixture of Patent Document 1 is positioned and attached to a heat sink base of a plate-shaped member arranged below a heat sink of a cylindrical member via the container and the housing. Therefore, the lighting fixture of Patent Document 1 has a complex structure for holding and positioning the power supply board.

[0005] The present disclosure is intended to solve the above-mentioned problems, and aims to obtain a lighting fixture having a heat sink that has a simple structure for holding and positioning a power supply board and improves assembly ease. [Means for solving the problem]

[0006] The lighting device of the present disclosure comprises a light source board on which a light source is mounted, a plate-shaped heat sink base having the light source board attached to one side and at least one recess formed therein, a cylindrical heat sink arranged on the other side of the heat sink base and having an opening formed at an end on the side where the heat sink base is arranged, a power supply board for supplying power to the light source, and a case housed in the heat sink, the case having a mounting surface portion extending perpendicular to the heat sink base and mounting the power supply board, the mounting surface portion of the case having a first convex portion formed to be inserted into at least one recess so as to protrude from the end on the side where the heat sink base is arranged. Effect of the Invention

[0007] According to the present disclosure, a lighting device includes a case that extends perpendicular to a heat sink base, has a mounting surface on which a power supply board is mounted, and is housed in a heat sink. The lighting device also has a first protrusion formed on the mounting surface of the case, the first protrusion being inserted into at least one recess so as to protrude from an end on the side where the heat sink base is arranged. The lighting device has a first protrusion that serves as a claw formed on the case on which the power supply board is mounted, and the first protrusion is inserted into a recess formed in the heat sink base, making it easier to determine the position of the case for the power supply board. Therefore, the lighting device has a simple structure for holding and positioning the power supply board, improving assembly. [Brief description of the drawings]

[0008] [Figure 1] 1 is a perspective view of a lighting device according to an embodiment, as viewed from above; [Diagram 2] 2 is a perspective view of the lighting fixture according to the embodiment as viewed from below. FIG. [Diagram 3] FIG. 2 is an exploded perspective view of the lighting fixture according to the embodiment. [Figure 4] 2 is a perspective view of a case and a heat sink base in a lighting fixture according to an embodiment, as viewed from below. FIG. [Diagram 5] 2 is a perspective view of a case and a heat sink base in a lighting device according to an embodiment, as viewed from above. FIG. [Figure 6] FIG. 2 is a perspective view of a heat sink base according to the embodiment. [Figure 7] 4 is a cross-sectional view of a recess in a heat sink base according to an embodiment. FIG. [Figure 8] 11 is another cross-sectional view of the recess of the heat sink base in the embodiment. FIG. [Figure 9] 13 is a perspective view of a modified example of the case of the lighting device according to the embodiment, as viewed from below. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The following describes the lighting fixture according to the embodiment with reference to the drawings. The forms of the components shown in the specification are merely examples and are not limited to these descriptions. In addition, in the following drawings including FIG. 1, the relative dimensional relationship and shape of each component may differ from the actual ones. In addition, in the following drawings, the same reference numerals are the same or equivalent, and this is common throughout the specification. In addition, to facilitate understanding, terms or orientations that indicate directions are used as appropriate, but these notations are descriptions used for convenience of explanation and do not limit the arrangement, direction, or orientation of devices, fixtures, or parts. Terms that indicate directions or orientations include, for example, up, down, right, left, front, back, front, or back.

[0010] Embodiment [Lighting fixtures 100] Fig. 1 is a perspective view of lighting fixture 100 according to an embodiment as viewed from above. Fig. 2 is a perspective view of lighting fixture 100 according to an embodiment as viewed from below. Fig. 3 is an exploded perspective view of lighting fixture 100 according to an embodiment.

[0011] 1 to 3, the Z-axis direction indicates the up-down direction of lighting fixture 100. Additionally, "upper side (upward)" corresponds to the Z1 direction, and "lower side (downward)" corresponds to the Z2 direction. The Z1 and Z2 directions indicate the directions when lighting fixture 100 is attached to a ceiling. The configuration of lighting fixture 100 will be described below with reference to the drawings.

[0012] The lighting fixture 100 is a downlight or a universal downlight to be inserted into a recess formed in a mounting portion such as a ceiling. The lighting fixture 100 includes a light-emitting unit 200 and a power supply unit 300 for lighting that supplies lighting power to the light-emitting unit 200.

[0013] [Light Emitting Unit 200] The light emitting unit 200 includes a light source substrate 210, a heat sink base 220, an insulating sheet 230, a light source holder 240, an optical member 250, and a housing 260. The light emitting unit 200 also includes an annular frame 400 and a plurality of mounting springs 500.

[0014] The light source board 210 constitutes a portion that emits light in the light-emitting unit 200. The light source board 210 may be referred to as a light source unit. The light source board 210 is a board on which light-emitting elements (not shown) that serve as light sources 211 are mounted. The light-emitting elements are, for example, COB (Chip On Board)-LEDs (Light Emitting Diodes). The light sources 211 shown in FIG. 3 are conceptually shown, and the number and arrangement of the light sources 211 are not limited to those shown in the drawings. The light sources 211 are mounted on the side on which the optical member 250 is arranged, that is, on the surface opposite to the heat sink base 220.

[0015] Light-emitting elements, which are light sources 211, are mounted on the light source substrate 210. A light source circuit including the light-emitting elements is disposed on the light source substrate 210. The number of light-emitting elements may be any number. The light-emitting elements may be solid-state light-emitting elements other than LEDs, such as organic EL (Electro-Luminescence) or lasers. The light-emitting elements do not have to be mounted on the light source substrate 210, and it is sufficient that a light source circuit including the light-emitting elements is disposed in the light-emitting unit 200.

[0016] The heat sink base 220 is used in the lighting fixture 100 as a fixing target for various members constituting the lighting fixture 100, and is also used to dissipate heat from the lighting fixture 100. The heat sink base 220 is used to dissipate heat from the light-emitting unit 200 and the power supply unit 300, for example.

[0017] The heat sink base 220 is a plate-shaped member. The heat sink base 220 is made of a thermally conductive material. In this embodiment, the heat sink base 220 is integrally molded from a metal material.

[0018] The heat sink base 220 is formed in a plate shape, and the light source board 210 is attached to one surface side. The heat sink base 220 may be simply called a base. The heat sink base 220 has two plate surfaces, a lower surface 225 which is the surface on the side where the light source board 210 is arranged, and an upper surface 226 which is the surface on the side where the power supply board 310 described later is arranged. The light source board 210 is fixed to the lower surface 225 which is one of the plate surfaces. That is, a light source circuit including a light emitting element is arranged on the lower surface 225 which is one of the plate surfaces of the heat sink base 220. The upper surface 226 which is the other plate surface is connected to the power supply unit 300. The power supply board 310 is arranged on the upper surface 226 side of the heat sink base 220. A detailed configuration of the heat sink base 220 will be described later.

[0019] In this embodiment, an insulating sheet 230, a light source substrate 210, a light source holder 240, an optical member 250, and a housing 260 are attached in this order to a lower surface 225, which is one plate surface of the heat sink base 220. The heat sink base 220, the insulating sheet 230, and the housing 260 are provided with a plurality of screw holes at corresponding positions.

[0020] 2, the screws 270 are inserted into the screw holes of the housing 260 and tightened through the screw holes of the heat sink base 220 and the insulating sheet 230 in order, thereby fixing the insulating sheet 230 and the housing 260 to the heat sink base 220. In other words, the screws 270 are inserted into the screw holes of the heat sink base 220 and the insulating sheet 230 in order, thereby fixing the heat sink base 220 and the insulating sheet 230 to the housing 260.

[0021] The light source substrate 210, the light source holder 240, and the optical member 250 are fixed by being sandwiched between the heat sink base 220 and the housing 260. An insulating sheet 230 is disposed between the heat sink base 220 and the light source substrate 210 and the light source holder 240.

[0022] The light source substrate 210 is placed on the light source holder 240. The light source substrate 210 is fixed by being sandwiched between the heat sink base 220 and the light source holder 240 via the insulating sheet 230. Note that the light source substrate 210 may also be provided with a screw hole. In this case, a screw is inserted into the screw hole of the heat sink base 220 by passing through the screw holes of the light source holder 240, the light source substrate 210, and the insulating sheet 230 in order.

[0023] The insulating sheet 230 is sandwiched between the heat sink base 220 and the light source substrate 210 to electrically insulate the light source substrate 210 from the heat sink base 220 .

[0024] The light source holder 240 is formed in a plate shape. The light source holder 240 is formed in, for example, a disk shape. The light source holder 240 is provided with a mounting portion 241 for mounting the light source substrate 210. The mounting portion 241 is formed on the plate surface side facing the insulating sheet 230, and is a portion formed in a recessed shape. The light source substrate 210 is placed in the mounting portion 241 formed in a recessed shape.

[0025] The mounting portion 241 of the light source holder 240 is provided with a circular opening 242 for exposing the light emitting element, which is the light source 211 of the light source substrate 210. The opening 242 is a through hole. The light emitted by the light source substrate 210 passes through the opening 242 and travels toward the optical member 250.

[0026] The optical member 250 is, for example, a member that controls the light distribution of the lighting device 100. The optical member 250 is formed in a substantially cylindrical shape. The optical member 250 reflects the light emitted from the light emitting element of the light source substrate 210 on the inner circumferential surface. The optical member 250 may include a lens (not shown).

[0027] When the optical member 250 has a lens, the lens controls the light distribution so that the light emitted from the light source substrate 210 is irradiated in a target direction. The lens is disposed inside the optical member 250. The lens covers the light emitting element of the light source substrate 210 disposed inside the light source holder 240, and is disposed on the optical axis of the light emitted from the light emitting element.

[0028] The optical member 250 may have a light-transmitting material that diffuses light. When the optical member 250 has a light-transmitting material that diffuses light, the optical member 250 transmits light directly emitted from the light-emitting elements of the light source substrate 210 and light reflected by the inner peripheral surface of the optical member 250 while diffusing the light.

[0029] The optical member 250 has a body portion 252 formed in a substantially cylindrical shape and a plurality of hook portions 255 protruding from the body portion 252. The hook portions 255 protrude from an upper end portion 252a of the body portion 252 formed in a substantially cylindrical shape toward the outer periphery, and are bent so that their tips point upward. The hook portions 255 are formed in an L-shape.

[0030] The optical member 250 is disposed inside the housing 260 in which the main body 252 is formed in a cylindrical shape, and the hook portion 255 is formed to be hooked onto the upper edge portion 261 of the housing 260. The heat sink base 220 is disposed on the inner periphery side of the hook portion 255. The hook portion 255 is sandwiched between the upper edge portion 261 of the housing 260 and the heat sink base 220.

[0031] The housing 260 is formed in a cylindrical shape. The housing 260 accommodates in its internal space the light source substrate 210, the light source holder 240 on which the light source substrate 210 is placed, and the optical member 250. As shown in FIG. 1, a reflector 265 that reflects light is disposed on the inner peripheral surface of the housing 260.

[0032] The hook portion 255 of the optical member 250 is placed on an upper edge portion 261 of the cylindrical housing 260. The heat sink base 220 is screwed to the upper edge portion 261 of the housing 260 with an insulating sheet 230 interposed therebetween.

[0033] A frame 400 is provided on the lower edge 262 of the housing 260 formed in a cylindrical shape. The lower edge 262 of the housing 260 is one end of the housing 260, and is an edge portion that forms an opening located on the light irradiation side. In other words, the frame 400 is formed on the end of the housing 260 on the side from which light is emitted.

[0034] The frame 400 is formed in an annular plate shape. The frame 400 is provided along the lower edge 262 of the housing 260, and protrudes radially outward. The outer diameter of the frame 400 is larger than the outer diameter of the embedding hole in which the lighting fixture 100 is attached. When the lighting fixture 100 is inserted into the embedding hole, the frame 400 abuts against the underside of a ceiling or the like, and covers the edge of the embedding hole.

[0035] An attachment spring 500 is provided on the outer peripheral surface of housing 260. Mounting spring 500, together with frame 400, holds the mounting portion such as a ceiling and abuts against the inner peripheral surface of the embedding hole, thereby fixing lighting device 100 to the mounting portion such as a ceiling. Although mounting spring 500 has been described as being provided on housing 260, it may be provided on frame 400.

[0036] The mounting spring 500 is made of an elastic material such as stainless steel, and is a leaf spring formed by bending a strip-shaped plate material. The base end of the mounting spring 500 is attached to the outer circumferential surface side of the housing 260, and the other end protrudes outward in the radial direction of the housing 260.

[0037] A plurality of mounting springs 500 are attached along the circumferential direction of frame 400 in order to fix lighting fixture 100 around the embedding hole in the ceiling. Three mounting springs 500 are attached at intervals in the circumferential direction of housing 260. Note that the number of mounting springs 500 is not limited to three, and may be more or less than three depending on, for example, the size of lighting fixture 100.

[0038] [Power supply unit 300] The power supply unit 300 includes a power supply board 310, a top plate 340, a terminal block 350, a case 370, and a cylindrical heat sink 390.

[0039] The power supply board 310 supplies power to the light source 211. A lighting circuit 311 is arranged on the power supply board 310. The lighting circuit 311 of the power supply board 310 and the light source circuit of the light source board 210 are electrically connected by a first electric wire (not shown). The first electric wire electrically connects the lighting circuit 311 arranged on the power supply board 310 and the light source circuit arranged on the light source board 210, thereby serving as an output path for lighting power from the lighting circuit 311 to the light source circuit. The power supply board 310 may also be referred to as a power supply device.

[0040] The top plate 340 is formed in a plate shape. A part of the top plate 340 closes the other end of the heat sink 390, which is formed in a cylindrical shape. In other words, the top plate 340 closes the other end of the peripheral wall portion 391 of the heat sink 390. The top plate 340 is formed of a thermally conductive material. In this embodiment, the top plate 340 is integrally molded from a metal material. The top plate 340 is fixed to the upper end of the peripheral wall portion 391 of the heat sink 390 by screwing or the like. The top plate 340 may be fixed to the upper end of the heat sink 390 by a method other than screwing.

[0041] Terminal block 350 is connected to an external power source (not shown) such as a commercial power source. Terminal block 350 is fixed to a part of top plate 340 on the outside of heat sink 390. Top plate 340 has a step 340a between a portion fixed to heat sink 390 and a portion to which terminal block 350 is fixed. The portion to which terminal block 350 is fixed is provided so as to be located relatively higher than the portion fixed to heat sink 390. Note that top plate 340 does not necessarily have step 340a.

[0042] The terminal block 350 and the power supply board 310 are electrically connected by a second electric wire (not shown). The second electric wire electrically connects the power supply board 310 and the terminal block 350, thereby serving as an input path for lighting power from an external power source to the lighting circuit 311 of the light source board 210.

[0043] The case 370 has a mounting surface portion 375 that extends perpendicular to the heat sink base 220 and has the power supply board 310 mounted thereon. The case 370 is housed inside the heat sink 390 that is formed in a cylindrical shape. The case 370 may also be referred to as a housing. The case 370 houses the power supply board 310 inside. Thus, in this embodiment, the power supply board 310 is not directly housed in the housing space formed inside the heat sink 390, but is housed via the case 370. Therefore, the heat sink 390 only needs to have a space inside to install the case 370, and does not need to have any extra space.

[0044] The case 370 is preferably made of a metal having high thermal conductivity such as aluminum. The case 370 may be made of an insulating material and integrally molded with a resin material. The case 370 is formed in a rectangular box shape with an opening on the surface facing the heat sink base 220.

[0045] 3, case 370 has case peripheral wall 373 formed in a cylindrical shape to cover power supply board 310 and lighting circuit 311, and has lid 374 at a portion facing top plate 340. Case peripheral wall 373 does not necessarily have to be cylindrical as long as it has a structure in which power supply board 310 is mounted and covers part of the plate surface of power supply board 310. Mounting surface portion 375 is a part of case peripheral wall 373.

[0046] The lid 374 closes one end of the case peripheral wall 373. The case 370 is formed in a cylindrical shape with a bottom. Note that the case 370 is not limited to this configuration as long as it can hold the power supply board 310 and fix the power supply board 310 to the heat sink base 220, and may be formed in other shapes such as a plate shape. The detailed structure of the case 370 will be described later.

[0047] The heat sink 390 is used to dissipate heat from the lighting device 100. The heat sink 390 is used to dissipate heat from, for example, the light-emitting unit 200 and the power supply unit 300. The heat sink 390 is made of a thermally conductive material. The heat sink 390 is made of a metal having high thermal conductivity, such as aluminum. The heat sink 390 is also made by, for example, extrusion molding. The heat sink 390 may be integrally molded from a metal material. The heat sink 390 has heat dissipation properties and also serves as a box that houses the power supply board 310.

[0048] The heat sink 390 is formed in a cylindrical shape, and is disposed on the other surface side (top surface 226 side) of the heat sink base 220. The cylindrical heat sink 390 has an opening formed at the end on the side where the heat sink base 220 is disposed. The heat sink 390 is formed in, for example, a rectangular cylindrical shape. The case 370 is housed inside the heat sink 390, and the power supply board 310 is housed inside the case 370. The heat sink 390 is used to dissipate heat from the power supply board 310 housed inside the case 370.

[0049] A lower end of the heat sink 390 abuts against the heat sink base 220. The heat sink 390 is used to dissipate heat from the light source substrate 210 via the heat sink base 220. That is, the heat sink 390 is used to dissipate heat from the light emitting unit 200.

[0050] The heat sink 390 has a peripheral wall portion 391 formed in a cylindrical shape, and a protruding portion 392 protruding outward from the outer wall surface of the peripheral wall portion 391.

[0051] 3, peripheral wall portion 391 is formed in a rectangular tube shape so as to fit the shape of case 370. Peripheral wall portion 391 may have another shape, such as a cylindrical shape, as long as it improves the heat dissipation properties of case 370.

[0052] Protrusion 392 is a plate-shaped fin. Protrusion 392 is not limited to a plate-shaped fin, and may have other shapes such as a columnar or mountain-shaped protrusion as long as it improves heat dissipation performance. The number of protrusions 392 may be one or more.

[0053] The heat sink 390 is fixed to the heat sink base 220 by screwing or the like. The heat sink 390 and the heat sink base 220 are in contact with each other and are connected to each other. Note that the connection between the heat sink 390 and the heat sink base 220 is not limited to screwing, and other well-known means such as fitting or welding may be used.

[0054] In the lighting device 100, heat generated from the light-emitting unit 200 while the light-emitting elements of the light source substrate 210 are turned on is conducted from the heat sink base 220 to the heat sink 390 to dissipate the heat. In the present embodiment, the heat sink 390 and the heat sink base 220 of the light-emitting unit 200 are in contact with each other, so that the heat generated in the light-emitting unit 200 can be efficiently conducted from the light-emitting unit 200 to the heat sink 390.

[0055] Moreover, heat sink 390 may be fixed to case peripheral wall 373 from the outside of case 370. In this embodiment, it is possible to change only the specifications of heat sink 390 in accordance with the application of lighting device 100, without changing the specifications of case 370.

[0056] Although heat sink 390 may be fixed to case peripheral wall portion 373 of case 370 by press-fitting case peripheral wall portion 373, in this embodiment, heat sink 390 is fixed to case peripheral wall portion 373 by being connected to case peripheral wall portion 373. For example, heat sink 390 is fixed to case peripheral wall portion 373 with screws.

[0057] In the lighting device 100, heat generated from the light-emitting unit 200 while the light-emitting elements of the light source board 210 are turned on is conducted from the heat sink base 220 to the heat sink 390 via the case peripheral wall portion 373, and dissipated. In the present embodiment, the lighting device 100 can efficiently conduct the heat generated in the light-emitting unit 200 from the light-emitting unit 200 to the heat sink 390 via the case 370. That is, in the lighting device 100, the case 370 is in contact with the heat sink base 220, and constitutes a part of a heat dissipation path that conducts the heat generated in the light-emitting unit 200.

[0058] The lighting device 100 has a heat dissipation path where heat generated in the light-emitting unit 200 is transferred from the heat sink base 220 to the heat sink 390, as well as a heat dissipation path where heat is transferred from the heat sink base 220 to the heat sink 390 via the case 370. When the lighting device 100 does not have the case 370 in contact with the heat sink base 220, only the outer periphery of the heat sink 390 is in contact with the heat sink base 220, thereby dissipating heat generated in the light-emitting unit 200. Since the lighting device 100 has an increased number of heat dissipation paths compared to when it does not have the case 370 in contact with the heat sink base 220, the heat dissipation performance is improved compared to when it does not have the case 370.

[0059] As described above, the lighting device 100 includes the light source board 210, the heat sink base 220, the heat sink 390, the power supply board 310, and the case 370. The lighting device 100 includes the heat sink base 220 and the heat sink 390 disposed on the light source 211, and the power supply board 310 is housed inside the heat sink 390.

[0060] As a variation of the present embodiment, the lighting fixture 100 may be a lighting fixture of a type other than a downlight type, but equipped with the same light-emitting unit 200 and power supply unit 300 as in the present embodiment. For example, the lighting fixture 100 may be a lighting fixture of a spotlight type, a flange light type, a ceiling light type, a bracket light type, a pendant light type, or the like.

[0061] [Details of case 370 and heat sink base 220] Fig. 4 is a perspective view of case 370 and heat sink base 220 in lighting device 100 according to the embodiment, as viewed from below. Fig. 5 is a perspective view of case 370 and heat sink base 220 in lighting device 100 according to the embodiment, as viewed from above. Fig. 6 is a perspective view of heat sink base 220 according to the embodiment. Details of case 370 and heat sink base 220 will be described with reference to Figs. 4 to 6.

[0062] The case 370 has a case peripheral wall portion 373 formed in a cylindrical shape. The case peripheral wall portion 373 of the case 370 has a mounting surface portion 375, a cover surface portion 377, and a side surface portion 376. The mounting surface portion 375, the cover surface portion 377, and the side surface portion 376 are plate-shaped members. The mounting surface portion 375, the cover surface portion 377, and the side surface portion 376 are formed so as to extend upward from the upper surface 226 of the heat sink base 220 in a state where the case 370 is attached to the heat sink base 220. The mounting surface portion 375, the cover surface portion 377, and the side surface portion 376 are formed so as to extend in the up-down direction (Z-axis direction) of the lighting device 100 in a state where the case 370 is disposed inside the lighting device 100.

[0063] The mounting surface portion 375 is a side wall of the case 370 on which the power supply board 310 is mounted, and is a side wall facing the plate surface of the power supply board 310. The mounting surface portion 375 is formed in, for example, an elongated rectangular shape, but is not limited to this shape.

[0064] A first protrusion 371 to be inserted into at least one recess 221 described later is formed on the mounting surface 375 of the case 370. The first protrusion 371 is formed so as to protrude from an end 375a of the mounting surface 375 on the side where the heat sink base 220 is arranged. In other words, the first protrusion 371 is formed so as to protrude from a lower end of the mounting surface 375.

[0065] The first protrusion 371 is a part where the surface of the end 375a partially protrudes. The first protrusion 371 is formed so as to extend downward from the end 375a, that is, from the end 375a to the arrangement side of the heat sink base 220. The first protrusion 371 is a claw, and is provided for hanging an object. The first protrusion 371 may be referred to as a first claw portion. There may be one or more first protrusions 371.

[0066] Cover surface portion 377 is a side wall of case 370 located opposite mounting surface portion 375 with power supply board 310 in between. Cover surface portion 377 covers power supply board 310 from the side opposite mounting surface portion 375. Note that case 370 need only have mounting surface portion 375 on which power supply board 310 is mounted and which has at least first protrusion 371, and is not necessarily required to have cover surface portion 377.

[0067] The side surface portion 376 is provided so as to protrude from a side portion 375b in a direction perpendicular to an end portion 375a of the mounting surface portion 375 on the side where the heat sink base 220 is arranged. The side surface portion 376 is provided so as to protrude from both end portions of the end portion 375a of the case 370 towards the side where the power supply board 310 is arranged, when viewed in the direction in which the mounting surface portion 375 extends, i.e., in the up-down direction (Z-axis direction). The side surface portion 376 is arranged so as to face an end face on the side of the power supply board 310, and covers the power supply board 310 from the side.

[0068] Side surface portion 376 is provided at an edge portion of mounting surface portion 375 along the extending direction of mounting surface portion 375. Side surface portion 376 is provided along the longitudinal direction of mounting surface portion 375. Mounting surface portion 375 and side surface portion 376 are provided in a U-shape when viewed in the up-down direction (Z-axis direction). Mounting surface portion 375 and side surface portion 376 may or may not be orthogonal to each other.

[0069] The side surface portion 376 includes a first side surface portion 376a and a second side surface portion 376b. The first side surface portion 376a and the second side surface portion 376b are side walls of the case 370 that face each other across the power supply board 310. The first side surface portion 376a covers the power supply board 310 from the side opposite to the second side surface portion 376b.

[0070] A second protrusion 372 to be inserted into at least one recess 221 described later is formed on the second side surface portion 376b of the case 370. The second protrusion 372 is formed on the second side surface portion 376b so as to protrude from an end portion 376c on the side where the heat sink base 220 is arranged. In other words, the second protrusion 372 is formed so as to protrude from the lower end portion of the side surface portion 376.

[0071] The second protrusion 372 is a part where the surface of the end 376c partially protrudes. The second protrusion 372 is formed so as to extend downward from the end 376c, that is, from the end 376c to the arrangement side of the heat sink base 220. The second protrusion 372 is a claw, and is provided for hanging an object. The second protrusion 372 may be called a second claw portion. The second protrusion 372 is inserted into a second recess 221b described later.

[0072] 4 and 5, the second protrusion 372 is formed on the second side surface portion 376b, but may be formed on the first side surface portion 376a. Also, the second protrusion 372 may be formed on each of the first side surface portion 376a and the second side surface portion 376b. Also, the number of second protrusions 372 may be one or more.

[0073] Fig. 7 is a cross-sectional view of recess 221 of heat sink base 220 in the embodiment. Fig. 8 is another cross-sectional view of recess 221 of heat sink base 220 in the embodiment. Heat sink base 220 is formed in a plate shape, and at least one recess 221 is formed in heat sink base 220. Recess 221 is a portion where upper surface 226 of heat sink base 220 is partially recessed.

[0074] The recess 221 is a hole penetrating one surface (lower surface 225) and the other surface (upper surface 226) of the heat sink base 220, as shown in Fig. 7. Alternatively, the recess 221 may be a recess formed on the other surface (upper surface 226) of the heat sink base 220, as shown in Fig. 8. The recess 221 may be a groove formed on the other surface (upper surface 226) of the heat sink base 220. In other words, the recess 221 may penetrate from the upper surface 226 to the lower surface 225 of the heat sink base 220, or may be a groove having a recessed shape formed on the upper surface 226.

[0075] There are multiple recesses 221, including a first recess 221a into which the first protrusion 371 is inserted, and a second recess 221b formed at a position different from the first recess 221a. Note that there may be only one recess 221, including only the first recess 221a into which the first protrusion 371 is inserted.

[0076] The first recesses 221a are formed to correspond to the first convex portions 371, and the second recesses 221b are formed to correspond to the second convex portions 372. The number of the first recesses 221a is at least the same as the first convex portions 371, and may be greater than the number of the first convex portions 371. The number of the second recesses 221b is at least the same as the second convex portions 372, and may be greater than the number of the second convex portions 372.

[0077] The first protrusion 371 is inserted into the first recess 221a. When the first protrusion 371 is inserted into the first recess 221a, the case 370 abuts against the heat sink base 220, and the first protrusion 371 abuts against at least one recess 221. The first protrusion 371 may fit into at least one recess 221. An end 375a of the case 370 abuts against the upper surface 226 of the heat sink base 220. More specifically, an end 375a of the mounting surface portion 375 of the case 370 on the side where the heat sink base 220 is arranged abuts against the upper surface 226 of the heat sink base 220.

[0078] The second protrusion 372 is inserted into the second recess 221b. When the second protrusion 372 is inserted into the second recess 221b, the case 370 abuts against the heat sink base 220. At this time, the first protrusion 371 abuts against the first recess 221a, and the second protrusion 372 abuts against the second recess 221b. The second protrusion 372 may be fitted into the second recess 221b. An end 376c of the case 370 abuts against the upper surface 226 of the heat sink base 220. More specifically, an end 376c of the side surface portion 376 of the case 370 on the side where the heat sink base 220 is arranged abuts against the upper surface 226 of the heat sink base 220.

[0079] It is desirable that the first protrusion 371 and the second protrusion 372 of the case 370 come into contact with the recess 221 of the heat sink base 220 when the case 370 is attached. This makes it easier for the lighting device 100 to conduct heat compared to a case not having this configuration, and improves the dissipation effect of heat generated from the light-emitting unit 200.

[0080] The lighting device 100 may be formed so that the first protrusion 371 and the second protrusion 372 of the case 370 fit into the recess 221 of the heat sink base 220. Furthermore, the lighting device 100 may be formed so that the tips of the first protrusion 371 and the second protrusion 372 of the case 370 are inclined (tapered) so as to become thinner toward the lower side, or so as to be inclined so that the upper side of the recess 221 is wider. By having such a configuration, the lighting device 100 makes it easier to insert the first protrusion 371 and the second protrusion 372 of the case 370 into the recess 221 of the heat sink base 220.

[0081] 9 is a perspective view of a modified example of case 370 in lighting device 100 according to an embodiment, viewed from below. As described above, case 370 only needs to have mounting surface portion 375 on which power supply board 310 is mounted and which has at least first protrusion 371, and does not need to have cover surface portion 377 (see FIG. 4). In other words, case 370 does not need to have a shape that covers the upper surface of power supply board 310. Case 370 only needs to be a plate-like one on which power supply board 310 is mounted.

[0082] [Effects of lighting fixture 100] The lighting device 100 includes a case 370 that extends perpendicular to the heat sink base 220, has a mounting surface 375 on which the power supply board 310 is mounted, and is housed in the heat sink 390. The lighting device 100 also includes a first protrusion 371 formed on the mounting surface 375 of the case 370 so as to protrude from an end 375a on the side where the heat sink base 220 is arranged, and is inserted into at least one recess 221. The lighting device 100 includes a first protrusion 371 that serves as a claw formed on the case 370 on which the power supply board 310 is mounted, and the first protrusion 371 is inserted into the recess 221 formed in the heat sink base 220, making it easier to determine the position of the case 370 of the power supply board 310. Therefore, the lighting device 100 has a simple structure for holding and positioning the power supply board 310, and improves assembly.

[0083] In addition, at least one recess 221 is a plurality of recesses, including a first recess 221a into which a first protrusion 371 is inserted and a second recess 221b formed at a position different from the first recess 221a. The case 370 has a side surface portion 376 provided so as to protrude from a side portion 375b in a direction perpendicular to an end portion 375a of the mounting surface portion 375 on the side where the heat sink base 220 is arranged. The side surface portion 376 is formed with a second protrusion 372 formed so as to protrude from an end portion 376c on the side where the heat sink base 220 is arranged and inserted into the second recess 221b. In the lighting device 100, the mounting surface portion 375 and the side surface portion 376 of the case 370 are each formed with a protruding portion, so that the case 370 is positioned on the heat sink base 220 in a plurality of directions, and therefore the attachment property of the power supply board 310 mounted on the case 370 is improved.

[0084] At least one recess 221 is a hole penetrating one surface side and the other surface side of heat sink base 220. In lighting device 100, the position of case 370 of power supply board 310 is easily determined by inserting first protrusion 371 into recess 221, which is a through hole formed in heat sink base 220. In lighting device 100, the position of case 370 of power supply board 310 is easily determined by inserting second protrusion 372 into recess 221, which is a through hole formed in heat sink base 220. Therefore, in lighting device 100, the attachment property of power supply board 310 mounted on case 370 is improved.

[0085] At least one recess 221 is a recess formed on the other surface (upper surface 226) of heat sink base 220. In lighting device 100, the position of case 370 of power supply board 310 is easily determined by inserting first protrusion 371 into recess 221, which is a recess formed in heat sink base 220. In lighting device 100, the position of case 370 of power supply board 310 is easily determined by inserting second protrusion 372 into recess 221, which is a recess formed in heat sink base 220. Therefore, in lighting device 100, the attachment property of power supply board 310 mounted on case 370 is improved.

[0086] Furthermore, the lighting device 100 includes a plate-shaped heat sink base 220 having the light source board 210 attached to one surface side and at least one recess 221 formed therein. The case 370 abuts against the heat sink base 220, and the first protrusion 371 abuts against the at least one recess 221. In the lighting device 100, the heat sink base 220 abuts against the case 370 in which the power supply board 310 is mounted, so that heat generated from the light source board 210 of the light-emitting unit 200 is easily transferred to the case 370, improving heat dissipation.

[0087] Moreover, first convex portion 371 fits into at least one of concave portions 221. In lighting device 100, first convex portion 371 fits into concave portion 221, so that positioning of case 370 is easy and the attachment of power supply board 310 mounted on case 370 is improved. In lighting device 100, first convex portion 371 fits into concave portion 221, so that holding of case 370 is strengthened and movement of case 370 can be suppressed compared to a case not having this configuration. Therefore, lighting device 100 can prevent case 370 from shifting in position or coming off.

[0088] Moreover, the case 370 abuts against the heat sink base 220, the first convex portion 371 abuts against the first concave portion 221a, and the second convex portion 372 abuts against the second concave portion 221b. In the lighting device 100, the heat generated from the light source board 210 of the light-emitting unit 200 is easily transferred to the case 370 by the abutment between the heat sink base 220 and the case 370 on which the power supply board 310 is mounted, and the heat dissipation is improved. In addition to the abutment portion between the first convex portion 371 and the first concave portion 221a, the lighting device 100 has an abutment portion between the second convex portion 372 and the second concave portion 221b. With this configuration, the lighting device 100 can more reliably position the case 370 and increase the heat dissipation path compared to a case without the abutment portion between the second convex portion 372 and the second concave portion 221b.

[0089] Additionally, second convex portion 372 fits into second concave portion 221b. In lighting device 100, positioning of case 370 is easier than in a case not having this configuration, and attachment of power supply board 310 mounted on case 370 is improved. In lighting device 100, holding of case 370 is further strengthened than in a case not having this configuration, and movement of case 370 can be suppressed. Therefore, lighting device 100 can prevent case 370 from shifting position or coming off.

[0090] Although the embodiments of the present disclosure have been described above, some of these embodiments may be combined and implemented. Alternatively, some or all of these embodiments may be partially implemented. For example, only one of the parts described as "parts" in the description of these embodiments may be adopted, or any combination of some of them may be adopted. Note that the present disclosure is not limited to these embodiments, and various modifications are possible as necessary.

[0091] Various aspects of the present disclosure are summarized below as appendices.

[0092] (Appendix 1) a light source substrate on which a light source is mounted; a plate-shaped heat sink base having the light source substrate attached to one side thereof and at least one recess formed therein; a cylindrical heat sink disposed on the other surface side of the heat sink base and having an opening formed at an end on the side where the heat sink base is disposed; a power supply board for supplying power to the light source; a case that extends perpendicular to the heat sink base, has a mounting surface on which the power supply board is mounted, and is housed in the heat sink; Equipped with The mounting surface portion of the case is The lighting device has a first protrusion formed thereon to be inserted into the at least one recess so as to protrude from the end portion on the side where the heat sink base is arranged. (Appendix 2) The at least one recess is a plurality of recesses, a first recess into which the first protrusion is inserted; A second recess formed at a position different from the first recess; Including, The case is a side surface portion provided so as to protrude from a side portion in a direction perpendicular to the end portion of the mounting surface portion on the side where the heat sink base is disposed, The side surface portion is A lighting device as described in Appendix 1, further comprising a second protrusion formed to protrude from the end of the heat sink base on which the heat sink base is arranged and to be inserted into the second recess. (Appendix 3) The at least one recess is 3. The lighting device according to claim 1 or 2, wherein the hole penetrates from the one surface side to the other surface side of the heat sink base. (Appendix 4) The at least one recess is 3. The lighting device according to claim 1, wherein the recess is formed on the other surface side of the heat sink base. (Appendix 5) The case is abutting the heat sink base, The first protrusion is 4. The lighting device according to claim 1, wherein the lighting device abuts against the at least one recess. (Appendix 6) The first protrusion is 6. The lighting device of claim 5, wherein the lighting device is fitted into the at least one recess. (Appendix 7) The case is abutting the heat sink base, The first protrusion is abutting against the first recess, The second protrusion is 3. The lighting device according to claim 2, abutting the second recess. (Appendix 8) The second protrusion is 8. The lighting device according to claim 7, which fits into the second recess. [Explanation of symbols]

[0093] 100 lighting fixture, 200 light emitting unit, 210 light source board, 211 light source, 220 heat sink base, 221 recess, 221a first recess, 221b second recess, 225 lower surface, 226 upper surface, 230 insulating sheet, 240 light source holder, 241 installation portion, 242 opening, 250 optical member, 252 main body portion, 252a upper end portion, 255 hook portion, 260 housing, 261 upper edge portion, 262 lower edge portion, 265 reflector, 270 screw, 300 power supply unit, 310 power supply board, 311 lighting circuit, 340 top plate, 340a step, 350 terminal block, 370 case, 371 first protrusion portion, 372 second protrusion portion, 373 case peripheral wall portion, 374 lid portion, 375 Mounting surface portion, 375a end portion, 375b side portion, 376 side surface portion, 376a first side surface portion, 376b second side surface portion, 376c end portion, 377 cover surface portion, 390 heat sink, 391 peripheral wall portion, 392 protruding portion, 400 frame, 500 mounting spring.

Claims

1. a light source substrate on which a light source is mounted; a plate-shaped heat sink base having one surface on which the light source substrate is attached and at least one recess formed; a cylindrical heat sink disposed on the other surface side of the heat sink base and having an opening formed at an end on the side where the heat sink base is disposed; a power supply board for supplying power to the light source; a case that extends perpendicular to the heat sink base, has a mounting surface on which the power supply board is mounted, and is housed in the heat sink; Equipped with The mounting surface portion of the case is A lighting device having a first protrusion formed thereon to be inserted into the at least one recess so as to protrude from an end portion on the side where the heat sink base is arranged.

2. The at least one recess is a plurality of recesses, a first recess into which the first protrusion is inserted; A second recess formed at a position different from the first recess; Including, The case is a side surface portion provided so as to protrude from a side portion in a direction perpendicular to the end portion on the side where the heat sink base is disposed of the mounting surface portion, The side surface portion is The lighting fixture according to claim 1 , further comprising a second protrusion formed to protrude from an end of the heat sink base on the side where the heat sink base is arranged and to be inserted into the second recess.

3. The at least one recess is 3. The lighting device according to claim 1, wherein the heat sink base has a hole penetrating from the one surface side to the other surface side.

4. The at least one recess is 3. The lighting device according to claim 1, wherein the recess is formed on the other surface of the heat sink base.

5. The case is abutting the heat sink base, The first protrusion is The lighting device according to claim 1 or 2, which abuts against the at least one recess.

6. The first protrusion is The luminaire of claim 5 , wherein the luminaire fits into the at least one recess.

7. The case is abutting the heat sink base, The first protrusion is abutting against the first recess, The second protrusion is The lighting device according to claim 2 , wherein the second recess is abutted against the second recess.

8. The second protrusion is The lighting device according to claim 7 , wherein the lighting device is fitted into the second recess.

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