JP5968065B2 - Heat sink and lighting fixture - Google Patents

Description

  The present invention relates to a heat sink that radiates heat generated by an LED light source, and a lighting fixture including the heat sink.

  In LED lighting fixtures, ADC (aluminum die cast) is adopted as a component for heat dissipation and member attachment. However, as the input power to the LED lighting fixture increases, the amount of heat generation increases, and the ADC heat sink for heat dissipation is increasing in size. Due to the increase in the size of the ADC heat sink, there are concerns about an increase in cost due to an increase in the weight of the instrument, an increase in initial cost, safety due to dropping, and the like.

JP 2007-150268 A Utility Model Registration No. 3151869 JP 2008-159455 A JP 2010-102897 A

  Conventional heat dissipation members (heat sinks) of LED downlights, for example, have a fin shape mainly formed of ADC (aluminum die cast). The ADC heat sink has excellent shape moldability and workability when there is an attachment member or the like. On the other hand, when the heat capacity increases, the shape and weight increase.

  In the case of a luminaire such as a downlight, since the diameter of the mounting hole formed in the indoor ceiling is determined, there is a production limitation that a heat sink member larger than a certain diameter cannot be created. Since the ADC heat sink having an increased heat capacity cannot be formed in a shape larger than a certain diameter as described above, the fin surface length is secured by increasing the fin length in order to increase the surface area. When creating a shape with a long fin length, the draft of the mold for production is greatly related, and the tip is thin and the root is thick. As a result, there is a problem that the weight increases, there is a risk of dropping, and the workability of mounting is lowered. Moreover, when it becomes complicated structures, such as undercut, there exists a subject that a metal mold life and manufacturing cost will have a big influence, and a manufacturing period and manufacturing cost will increase.

  An object of the present invention is to provide a heat sink that can secure a corresponding surface area with a simple structure, and is capable of efficiently radiating heat.

  A heat sink according to the present invention, in a heat sink that dissipates heat emitted from a light source mounted on a mounting surface of a light source substrate, has a close contact surface that is in close contact with the back surface of the mounting surface, and a back surface of the close contact surface, A heat radiating member having an opening penetrating from the close contact surface to the back surface of the close contact surface, and a long bottom plate, and a pair of opposing side walls by bending both lateral edges of the bottom plate in the same direction A fin member formed with a plate, wherein the fin member is in close contact with the back surface of the mounting surface through the opening, and the pair of side wall plates are in close contact with the inner wall surface of the opening. It is characterized by being.

  A heat sink according to the present invention, in a heat sink that dissipates heat emitted from a light source mounted on a mounting surface of a light source substrate, has a close contact surface that is in close contact with the back surface of the mounting surface, and a back surface of the close contact surface, A heat radiating member having an opening penetrating from the close contact surface to the back surface of the close contact surface, and a long bottom plate, and a pair of opposing side walls by bending both lateral edges of the bottom plate in the same direction A fin member formed with a plate, wherein the fin member is in close contact with the back surface of the mounting surface through the opening, and the pair of side wall plates are in close contact with the inner wall surface of the opening. Therefore, a corresponding surface area can be secured with a simple structure, and a heat sink that is lightweight and can efficiently dissipate heat can be provided.

1 is an exploded perspective view of a lighting fixture 100 according to Embodiment 1. FIG. (A) is a perspective view of the heat sink 190 which concerns on Embodiment 1, (b) is a perspective view of the lighting fixture 100 which concerns on Embodiment 1. FIG. (A) is a perspective view of the fin member 110 which concerns on Embodiment 1, (b) is a perspective view of the base member 120 which concerns on Embodiment 1. FIG. FIG. 2 is a heat sink 190 according to the first embodiment, where (a) shows a state before the fin member 110 is attached to the base member 120, and (b) shows a state where the fin member 110 is attached to the base member 120. It is. (A) is sectional drawing of the transversal direction of the fin member 110 of the heat sink 190 which concerns on Embodiment 1, (b) is the C section enlarged view of (a). It is a figure which shows the lighting fixture 100 which concerns on Embodiment 1, (a) is a perspective view of the lighting fixture 100, (b) is a figure which shows an example of the flow of the wind in the lighting fixture 100. FIG. It is a figure which shows the state which attaches the lighting fixture 100 which concerns on Embodiment 1 to the ceiling hole 210 of the ceiling surface 200. FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description of the embodiments, directions such as “up”, “down”, “left”, “right”, “front”, “back”, “front”, “back” are for convenience of explanation. It is only described as such, and does not limit the arrangement or orientation of devices, instruments, parts, and the like.

Embodiment 1 FIG.
FIG. 1 is an exploded perspective view of a lighting fixture 100 according to the present embodiment. The whole structure of the lighting fixture 100 which concerns on this Embodiment is demonstrated using FIG.

  The lighting fixture 100 according to the present embodiment is, for example, a downlight attached to a ceiling hole formed on the ceiling surface. For convenience of explanation, the light emission direction side is the lower side, and the opposite side (ceiling surface side, ceiling hole side) of the light emission direction is the upper side.

  As shown in FIG. 1, the luminaire 100 includes a heat sink 190, a heat radiating diffusion sheet 180, a light source module 140, a substrate holder 130, a diffusion cover 150, and a reflection unit 160.

  The heat sink 190 includes a plurality of fin members 110 and a base member 120 (an example of a heat radiating member) to which the plurality of fin members 110 are attached. FIG. 2A shows a state in which the heat sink 190 is assembled. A detailed structure of the heat sink 190 will be described later.

  In the base member 120 of the heat sink 190, a surface to which the fin member 110 is attached is a fin member attachment surface 121, and a surface to which the light source module 140 is attached is a substrate contact surface 122 (substrate attachment surface). The heat sink 190 attaches the light source module 140 to the substrate contact surface 122 via the heat dissipation diffusion sheet 180. The heat dissipation diffusion sheet 180 is a sheet for efficiently conducting heat from the light source module 140 to the base member 120 and is a sheet for insulating the heat sink 190 and the light source module 140.

  The light source module 140 is a light source substrate that includes a mounting surface 142 on which an LED light source (LED 170 (see FIG. 5)) is mounted and a mounting surface back surface 141 that is the back surface of the mounting surface 142. The mounting surface rear surface 141 of the light source module 140 is in contact with the substrate contact surface 122 of the heat sink via the heat dissipation diffusion sheet 180.

  The substrate holder 130 is ring-shaped, and holds the periphery of the light source on the mounting surface 142 of the light source module 140 with the upper side (ceiling surface side) surface, and the mounting surface rear surface 141 of the light source module 140 serves as the substrate contact surface 122 of the heat sink 190. Press on. Then, the light source module 140 is sandwiched between the substrate holder 130 and the base member 120 and fixed with screws 171.

  The screw 171 is passed through the screw hole formed in the substrate retainer 130 from the lower side (light emission direction side) of the substrate retainer 130, and while holding the light source module 140 and the heat radiating diffusion sheet 180 by the substrate retainer 130, Screwed onto the substrate contact surface 122. Thereby, the light source module 140 is fixed to the heat sink 190. The mounting surface rear surface 141 of the light source module 140 is in close contact with the substrate contact surface 122 of the heat sink 190. The board contact surface 122 is an example of a contact surface that is in close contact with the mounting surface back surface 141 of the light source module 140.

  The heat sink 190 in a state where the light source module 140 is attached by the substrate holder 130 is attached to the reflector 160 with the diffusion cover 150 interposed therebetween. In the heat sink 190 in a state where the light source module 140 is attached, the screw 172 is passed through the screw hole 123b of the base member 120 from the fin member attachment surface 121 side, and the surface below the substrate holder 130 (light emission direction side) The diffusion cover 150 is sandwiched between the reflector 160 and the reflector 160 to be screwed and fixed.

  The diffusion cover 150 covers the light source mounted on the light source module 140 and controls light from the light source. The reflection unit 160 has a substantially conical shape, and includes a reflector 162 that serves as a reflection plate that reflects light from the light source and controls light distribution on the inner surface. Moreover, the reflection part 160 is provided with the flame | frame 163 provided with the attachment spring 161 for fixing the lighting fixture 100 to ceiling holes, such as a ceiling surface.

  2A is a perspective view of the heat sink 190 according to the present embodiment, and FIG. 2B is a perspective view of the luminaire 100 according to the present embodiment. FIG. 2A shows a heat sink ASSY showing a state where the part A of FIG. 1 is assembled. Moreover, FIG.2 (b) shows the lighting fixture ASSY which shows the state which assembled the whole of FIG.

  3A is a perspective view of the fin member 110 according to the present embodiment, and FIG. 3B is a perspective view of the base member 120 according to the present embodiment. 4A and 4B show the heat sink 190 according to the present embodiment, in which FIG. 4A shows a state before the fin member 110 is attached to the base member 120, and FIG. 4B shows the state where the fin member 110 is attached to the base member 120. It is a figure which shows a state. 4 (a) and 4 (b) show the state of the position of the BB cross section of FIG. 3 (b). The detailed structure of the heat sink 190 will be described with reference to FIGS.

  The fin member 110 is formed of a metal plate such as aluminum. The fin member may be other than an aluminum plate, and may be any material that has good thermal conductivity and can be easily processed. The fin member 110 is a thin plate formed by bending.

  As shown in FIG. 3A, the fin member 110 includes a rectangular bottom plate 112 and a pair of fins 111 formed at both ends in the short direction of the bottom plate 112 (fin member 110). Assuming that the upper surface of the bottom plate 112 is the bottom plate surface 112a and the lower surface of the bottom plate 112 is the bottom plate back surface 112b, the pair of fins 111 protrudes upward from both lateral ends of the bottom plate surface 112a. Formed as follows. The pair of fins 111 are formed so that the distance gradually increases as the distance from the bottom plate surface 112a increases. The pair of fins 111 is an example of a pair of side wall plates.

  The fin member 110 has a substantially V-shaped, U-shaped, or U-shaped cross section in the short direction. The fin member 110 is a leaf spring in which a force P2 that tries to maintain the interval acts when a force P1 that presses the inside from the outside to the pair of fins 111 is applied.

  The fin member 110 includes a notch 113 formed by notching the bottom plate 112 and part of the fins 111 on both sides in the vicinity of the center in the longitudinal direction. The notch 113 is formed by notching the fins 111 and the bottom plate 112 on both sides into a U-shaped cross section in the short direction. Let the edge part of the notch part 113 be the notch edge part 113b.

  The fin 111 includes a pair of fin side edges 116 at both ends in the longitudinal direction of the fin member 110. A pair of fin side edge part 116 is provided with a pair of fin cut part 115 cut | disconnected diagonally by the upper corner | angular part. The pair of fin cut portions 115 are formed so as to gradually become thinner upward.

  The fin member 110 is formed, for example, by bending a single aluminum metal plate.

  The base member 120 is formed of a metal plate such as aluminum. The base member 120 may be a material other than an aluminum plate, as long as it has a good thermal conductivity and can be easily processed. The base member is a thick disk. For example, the thickness L <b> 2 of the base member 120 is approximately the same as the width L <b> 1 in the short direction of the bottom plate 112 of the fin member 110. Further, the shape of the base member 120 may not be a circle, but may be a square, a rectangle, an ellipse, a polygon, or the like.

  As shown in FIG. 3B, the base member 120 includes a plurality of openings 124 that penetrate from the fin member mounting surface 121 to the substrate contact surface 122. It is assumed that one fin member 110 is inserted into one opening 124. The opening 124 has a blocking part 124b at the center in the longitudinal direction, and the opening 124 is divided into two openings 124a. That is, the single opening 124 includes two openings 124a arranged in series and a blocking portion 124b between the two openings 124a.

  In FIG. 3B, six openings 124 are formed in the base member 120. That is, the base member 120 includes twelve openings 124a and six blocking portions 124b.

  The lengths in the longitudinal direction of the six openings 124 (124-1, 124-2, 124-3, 124-4, 124-5, 124-6) are different from each other. The lengths of the two openings 124-3 and 124-4 in the vicinity of the diameter of the circular base member 120 are longer than those of the other four openings 124-1, 124-2, 124-5, and 124-6. Is also formed long. The lengths of the two openings 124-1 and 124-6 in the vicinity of the periphery of the circular base member 120 are the same as the lengths of the other four openings 124-2, 124-3, 124-4, and 124-. It is shorter than 5.

  Thus, since the length of the opening 124 can be set according to the shape of the base member 120, the fin member 110 can be disposed on the base member 120 without waste. For example, in the case of a square, the plurality of openings 124 have the same length, and the fin member 110 having the same length as the opening 124 can be disposed and attached to the square base member 120 without waste.

  The shape of the base member 120 is formed in accordance with, for example, a ceiling hole 210 (see FIG. 7) formed in the ceiling surface 200 (see FIG. 7). Since the base member 120 is restricted by the shape and size of the ceiling hole 210, it is necessary to configure the fin member 110 having a surface area as large as possible with respect to the base member 120.

  According to the heat sink 190 according to the present embodiment, the arrangement of the plurality of fin members 110 can be freely set. In addition, since the length of each fin member 110 in the longitudinal direction can also be changed, the shape of the region where the plurality of fin members 110 are arranged on the fin member mounting surface 121 of the base member 120 can be freely set. Therefore, the fin member 110 having a surface area as large as possible can be configured for the base member 120, and the heat sink 190 having high heat dissipation efficiency can be configured.

  Of the inner wall surfaces forming the opening 124 (opening portion 124a), the inner wall surface in the longitudinal direction is the inner wall surface 124c in the longitudinal direction, and the inner wall surface in the shorter direction is the inner wall surface 124d in the short direction.

  Next, a method for attaching the fin member 110 to the base member 120 will be described with reference to FIGS. 3 and 4.

  As shown in FIG. 4 (a), the fin member 110 is given a pressing force P1 from the outer side to the inner side from both sides, and the gap between the pair of fins 111 is reduced, while the fin member mounting surface 121 side is moved to the opening 124. Inserted (press-fit). At this time, the blocking part 124b fits into the notch 113 shown in FIG. The height L6 of the notch 113 is substantially equal to the width L2 of the base member 120. Further, the width L7 of the notch 113 is substantially equal to the width L8 of the blocking part 124b. Therefore, since the cut-off edge portion 113b of the cut-out portion 113 is in close contact with the blocking portion 124b of the base member 120 and the inner wall surface 124d in the short direction of the opening portion 124, the thermal resistance is reduced and heat conduction is not wasted.

  Further, when the blocking portion 124b is fitted into the notch 113, there is an effect of positioning the fin member 110 with respect to the base member 120, and workability is improved.

  FIG. 4B is a cross-sectional view illustrating a state where the fin member 110 is press-fitted into the opening 124 of the base member 120. When the fin member 110 is press-fitted into the opening 124 of the base member 120, the bottom plate back surface 112 b is disposed on the substrate contact surface 122 side of the opening 124. In addition, the pair of fins 111 project substantially vertically from the opening 124 toward the fin member mounting surface 121 (the back surface of the contact surface). As shown in FIG. 4B, a space 125 is formed between the pair of fins 111 in the heat sink 190.

  The fin member 110 presses the inner wall surface 124c in the longitudinal direction that forms the opening 124 with a force P2 that maintains the distance between the pair of fins 111. As a result, the fin member 110 is locked to the inner wall surface 124 c in the longitudinal direction of the opening 124.

  5A is a cross-sectional view in the short-side direction of the fin member 110 of the heat sink 190 according to the present embodiment, and FIG. 5B is an enlarged view of a portion C in FIG.

  Further, as shown in FIG. 5A, the mounting surface rear surface 141 of the light source module 140 is in close contact with the substrate contact surface 122 of the base member 120. The bottom plate back surface 112 b of the fin member 110 is also in close contact with the mounting surface back surface 141 of the light source module 140 through the opening 124.

  As shown in FIG. 5B, at the wavy line portion R2, the outer surface of the fin 111 and the longitudinal inner wall surface 124c of the opening 124 come into contact with each other, and the pair of fins 111 are forced to maintain a distance by the force P2. The outer surface of 111 and the inner wall surface 124c in the longitudinal direction of the opening 124 are in close contact with each other. In the wavy line portion R3, the bottom plate back surface 112b of the fin member 110 and the mounting surface back surface 141 of the light source module 140 are in direct contact with each other.

  As described above, the light source module 140 is directly brought into close contact with the fin member 110 of the heat sink 190 (heat sink ASSY) composed of the base member 120 and the fin member 110 which are firmly fitted, thereby radiating heat generated from the LED 170. In this case, there is no thermal resistance and heat can be radiated efficiently.

  FIGS. 6A and 6B are diagrams illustrating the lighting fixture 100 according to the present embodiment, where FIG. 6A is a perspective view of the lighting fixture 100, and FIG. 6B is a diagram illustrating an example of the flow of wind in the lighting fixture 100. FIG. 7 is a diagram illustrating a state in which the lighting apparatus 100 according to the present embodiment is attached to the ceiling hole 210 of the ceiling surface 200.

  As shown in FIGS. 6A and 6B, the heat sink 190 of the present embodiment has a space portion 125 between adjacent fins 111. The heat sink 190 flows into the space portion 125 (heat sink 190) from both ends in the longitudinal direction of the fin 111, thereby realizing an efficient wind flow.

  The wind that has flowed into the space 125 (heat sink 190) from both ends in the longitudinal direction of the fin 111 further hits the entire surface of the fin 111 due to the action of the wind flowing from the low heat portion to the high heat portion. As shown in FIG. 6 (b), the wind that has entered the space 125 from both longitudinal ends of the fin member 110 flows upward in the heat sink 190. As described above, the heat of the fin member 110 is efficiently radiated while the wind flows between the fins 111 of the heat sink 190. Since the fins 110 are arranged side by side, the surface area of the fin member 110 is also increased, so that the heat capacity of the heat sink 190 can also be increased. Thereby, it is possible to dissipate heat (heat exchange) more efficiently.

  As shown in FIGS. 6A, 6 </ b> B, and 7, a pair of fin cut portions 115 having corner portions cut off are formed at the upper portions of both ends in the longitudinal direction of the fin 111. In the fin 111, upper portions of both end portions in the longitudinal direction of the fin 111 are cut by a pair of fin cut portions 115. The fins 111 are formed so that the width in the longitudinal direction gradually becomes narrower, that is, tapers as they move away from the bottom plate surface 112a (see FIG. 4A).

  As shown in FIG. 7, the fin cut portion 115 is formed so that the angle θ is approximately 45 ° with respect to a surface r <b> 1 parallel to the fin member mounting surface 121 (see FIG. 6B) of the base member 120. Is done. The angle θ is preferably 30 ° to 60 °, more preferably 40 ° to 50 °, and most preferably 45 °.

  As shown in FIG. 7, when the lighting apparatus 100 is inserted into the ceiling hole 210 of the ceiling surface 200, it is necessary to make the shape of the heat sink 190 smaller than the ceiling hole 210 in order to reliably insert the lighting apparatus 100 into the ceiling hole 210. . By cutting the tip of the fin by about 45 °, the width (diameter) of the upper portion of the fin member can be made smaller than the diameter of the ceiling hole 210 at the time of the insertion approach, and the insertion becomes easy.

  Moreover, the upper surface part of the fin member 110 has the same height, and the upper end part of each fin 111 is located on substantially the same plane (on the upper surface part). For this reason, it is easier to insert the lighting fixture 100 into the ceiling hole 210, and the safety of the work is improved.

  As described above, since the diameter of the upper surface portion of the lighting fixture 100 can be made smaller than the diameter of the ceiling hole 210, the clearance between the peripheral portion of the ceiling hole 210 and the fin member 110 can be reduced. Therefore, since the shape of the heat sink 190 can be made as large as possible as compared with a case where a large clearance is required, it is possible to suppress a decrease in heat dissipation efficiency and to be easily inserted into the ceiling hole 210. Become.

  The shape of the base member 120 is formed according to the ceiling hole 210 formed in the ceiling surface 200. Since the base member 120 is restricted by the shape and size of the ceiling hole 210, it is necessary to configure the fin member 110 having a surface area as large as possible with respect to the base member 120.

  According to the heat sink 190 according to the present embodiment, the arrangement of the plurality of fin members 110 can be freely set. In addition, since the length of each fin member 110 in the longitudinal direction can also be changed, the shape of the region where the plurality of fin members 110 are arranged on the fin member mounting surface 121 of the base member 120 can be freely set. Therefore, the clearance between the periphery of the ceiling hole 210 and the outer periphery of the fin member 110 can be reduced, and the heat sink 190 with high heat dissipation efficiency can be configured.

  As described above, the lighting fixture 100 according to the present embodiment controls the light source unit (light source module 140), the reflector that fixes the light source unit and serves as a reflector, the light distribution, and the light emission angle. A frame including an attachment spring that can be fixed to the ceiling, a power supply device box (not shown) that supplies power, and a heat sink structure (heat sink 190) for heat dissipation of the light source module 140 are provided. The heat sink structure (heat sink 190) includes a base member 120 (flat plate) in which square holes (openings 124) are formed, and a U-shaped (V-shaped and U-shaped sheet metal) fin member 110. Is configured by press-fitting into a square hole. The heat sink structure (heat sink 190) is composed of two parts of aluminum sheet metal.

  As described above, according to the lighting fixture 100 according to the present embodiment, when assembled to the heat sink ASSY (heat sink 190), the heat sink fin (fin member 110) is solidified by press-fitting into the heat sink base (base member 120). The heat sink fins are substantially V-shaped in order to be fitted to each other. At the time of insertion, the fin member 110 is deformed perpendicularly from the V-shape and press-fitted to improve the adhesion between the outer surface of the fin 111 and the inner surface of the opening 124, and there is a thermal resistance between the heat sink base and the heat sink fin. Loss and improve heat dissipation performance.

  Further, according to the lighting apparatus 100 according to the present embodiment, the heat sink structure for heat dissipation is composed of two parts of the AL sheet metal, and it has a simple shape and a structure that is easy to assemble easily at a low cost without a mold. Since it can be constructed with a wall thickness and is lighter than the current ADC, it also contributes greatly to mounting, etc. Furthermore, it reduces heat resistance from the structure that directly hits the heat sink (outer U-shaped fin) to the heat source and efficiently dissipates heat. it can.

  In addition, the lighting fixture 100 according to the present embodiment has a substantially 45 ° processing (a pair of fin cuts) on the tip portion of the heat sink fin (fin member 110) configured in a U shape (V shape or U shape). Part 115). It has a structure (fin cut portion 115) that is easy to attach when inserted into the ceiling surface 200, and the fins 111 have a uniform height. As a result, the workability when inserted into the ceiling hole 210 is improved and the safety is also improved.

  Moreover, the lighting fixture 100 which concerns on this Embodiment has the same shape (length difference) from which the length of the longitudinal direction of the several fin 111 differs. Thereby, since the fin member 110 can be formed according to the shape of the ceiling hole 210, the clearance between the peripheral part of the ceiling hole 210 and the outer periphery of the fin member 110 can be reduced. Thereby, heat dissipation efficiency can be improved without waste.

  DESCRIPTION OF SYMBOLS 100 Lighting fixture, 110 Fin member, 111 Fin, 112 Bottom plate, 112a Bottom plate surface, 112b Bottom plate back surface, 113 Notch part, 113b Notch edge part, 115 Fin cut part, 116 Fin side edge part, 120 Base member , 121 Fin member mounting surface, 122 Substrate contact surface, 123a, 123b Screw hole, 124, 124a Opening, 124b Blocking portion, 124c Longitudinal inner wall surface, 124d Short inner wall surface, 125 Space portion, 130 Substrate retainer, 140 Light source module, 141 Mounting surface back surface, 142 Mounting surface, 150 Diffusion cover, 160 Reflection part, 161 Mounting spring, 162 Reflector, 163 Frame, 170 LED, 171, 172 Screw, 180 Heat radiation diffusion sheet, 190 Heat sink, 200 Ceiling surface, 21 Ceiling hole.

Claims (5)

In the heat sink that dissipates heat generated from the light source mounted on the mounting surface of the light source substrate,
A heat radiating member having an opening penetrating from a close contact surface in close contact with the back surface of the mounting surface to a back surface of the close contact surface;
A fin member having a long bottom plate and a pair of opposing side wall plates formed in the same direction from both lateral edges of the bottom plate , wherein the bottom plate and the pair of side wall plates are cut. A fin member formed with a notched notch,
The fin member is
A heat sink in which the bottom plate is in close contact with the back surface of the mounting surface through the opening, the pair of side wall plates are in close contact with the inner wall surface of the opening, and the blocking portion is fitted in the notch.   The heat sink according to claim 1, wherein an edge portion of the cutout portion and the blocking portion are in close contact with each other. The fin member is
The pair of side wall plates are formed so that the distance between the front end portions thereof is widened in advance, and is locked to the inner wall surface of the opening portion in a pressed state by the elastic force in the expanding direction of the pair of side wall plates. Item 3. The heat sink according to Item 1 or 2. Each side wall plate of the pair of side wall plates is
The heat sink according to any one of claims 1 to 3, wherein corner portions on both sides of the tip portion are cut.   The lighting fixture provided with the heat sink of any one of Claim 1 to 4, the light source board attached to the said heat sink, and the lighting device which lights the light source with which the said light source board is provided.

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