JP2013257971A - Heat sink and lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat sink capable of securing a suitable surface area with a simple structure, improving convection performance of air and efficiently radiating heat with light weight.SOLUTION: A heat sink includes a base member 120 having a board adhesion surface 122 appressed to a back surface 141 of a mounting surface and forming an opening 124 penetrated from the board adhesion surface 122 to a fin member mounting surface 121; and a fin member 110 having a bottom plate 112 having a bottom plate surface 112a and a bottom plate back surface 112b and a pair of fins 111 formed on both ends in a short-length direction of the bottom plate surface 112a and preparing the bottom plate back surface 112b on a board adhesion surface 121 side of the opening 124 and projecting the pair of fins 111 from the opening 124 to the board adhesion surface back surface 121 side. The pair of fins 111 project from the surface of one fin 111 to the other fin side, and have flanges 114 wherein each flange end 114a is connected with the other fin 114.

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 device increases, the amount of heat generation increases, and the ADC heat sink for heat dissipation increases. 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 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 is determined, there is a structural restriction that a heat sink member larger than a certain diameter cannot be created. Therefore, in the ADC heat sink having an increased heat capacity, when it is desired to secure a corresponding surface area, the shape cannot be made larger than a certain diameter, so that the fin length is increased to ensure 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 improve the convection of air, and that can efficiently radiate heat.

  The heat sink according to the present embodiment is a heat sink that dissipates heat emitted from a light source mounted on a mounting surface of a light source substrate, and includes a close contact surface that is in close contact with the back surface of the mounting surface, and the close contact surface to the close contact surface. A fin member comprising a heat radiating member having a predetermined thickness in which an opening penetrating to the back surface is formed, a bottom plate, and a pair of fins formed by bending both lateral edges of the bottom plate. The bottom plate is inserted into the opening, and the pair of fins protrude from the opening, and the pair of fins is connected to the other end of one fin. A flange having a tip abutting on the fin is provided.

  The heat sink according to the present embodiment includes a close contact surface that is in close contact with the back surface of the mounting surface 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 portion in which an opening penetrating to the back surface of the bottom plate, a bottom plate having a bottom plate surface and a bottom plate back surface, and a pair of side wall plates formed at both lateral ends of the bottom plate surface. A fin member provided, wherein the bottom plate back surface is disposed on the close contact surface side of the opening and the pair of side wall plates protrude from the open portion to the back surface side of the close contact surface; The pair of side wall plates are plate portions formed so as to protrude from the surface of one side wall plate to the other side wall plate side, and an end portion on the other side wall plate side is the other side wall plate The plate part connected to the plate Obtain because, it is possible to improve the convective air while securing the surface area corresponding with a simple structure, it is possible to provide a heat sink capable of lightweight dissipated efficiently.

It is a disassembled perspective view of the lighting fixture 100 which concerns on this Embodiment. (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). 6 is a view showing the flow of air flowing into the heat sink 190 from both longitudinal end surfaces of the fin member 110 in the heat sink 190 of the first embodiment. FIG. FIG. 6 is a simulation diagram illustrating a thermal effect of the heat sink 190 according to the first embodiment.

  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 an attachment hole formed on the ceiling surface. For convenience of explanation, the light emission direction side is defined as the lower side, and the opposite side (ceiling surface side, mounting hole side) of the light emission direction is defined as the upper side.

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

  The heat sink 190 includes a plurality of fin members 110 and a base member 120 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 dissipating diffusion sheet 180 is a sheet for efficiently conducting heat from the light source module 140 to the base member 120 and also electrically 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 123 a formed in the substrate holder 130 from the lower side (light emission direction side) of the substrate holder 130, and the substrate holder 130 holds the light source module 140 and the heat dissipation diffusion sheet 180 while holding the heat sink. Threaded onto the substrate contact surface 122 of 190 and fixed. As described above, the mounting surface back 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 light 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 light diffusion cover 150 is sandwiched between the reflection unit 160 and the reflection unit 160 to be screwed and fixed.

  The light 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 equipped with the flame | frame 163 provided with the attachment spring 161 for fixing the lighting fixture 100 to attachment 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 formed by bending both lateral edges of the bottom plate 112 (fin member 110) in the same direction. 111. 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. Further, the pair of fins 111 are bent in advance so that the distance on the tip side gradually increases.

  The fin member 110 is formed in advance so that the cross section in the short direction is substantially U-shaped, substantially U-shaped, and substantially V-shaped, and the tip portions of the pair of fins 111 are in an expanded state. The fin member 110 is a kind of a force P2 that attempts to return the interval between the tip portions to the original interval when a force P1 that attempts to reduce the interval between the tip portions is applied to each fin 111 of the pair of fins 111. It is a leaf spring.

  In the case of the substantially U-shaped fin member 110, in a state where the fin member 110 is not attached to the base member 120, the bottom plate 112 protrudes downward (the bottom plate 112 is curved downward). When the substantially U-shaped fin member 110 is attached to the base member 120, a portion protruding downward from the bottom plate 112 (a portion curved downward) is crushed into a flat shape, and the bottom plate back surface of the bottom plate 112 112b and the board | substrate contact | adherence surface 122 of the base member 120 become the same surface.

  In the case of the substantially V-shaped fin member 110, in a state where the fin member 110 is not attached to the base member 120, a portion that becomes the bottom plate 112 becomes a corner portion protruding downward. When the substantially V-shaped fin member 110 is attached to the base member 120, the corners protruding downward from the bottom plate 112 are crushed into a flat bottom plate 112, and the bottom plate back surface 112 b of the bottom plate 112 and The base member 120 is flush with the substrate contact surface 122.

  The fin member 110 is formed by forming the substantially U-shaped or substantially V-shaped fin member 110 in which the bottom plate 112 is not planar, rather than the bottom plate 112 forming the planar substantially U-shaped fin member 110. May be easy and may reduce costs. As described above, even if the fin member 110 is substantially U-shaped or substantially V-shaped, the bottom plate back surface 112b and the substrate contact surface 122 are flush with each other when attached to the base member 120. The adhesion between the face plate back surface 112b and the mounting surface back surface 141 of the light source module 140 is maintained (see FIG. 5B).

  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 pair of fins 111 includes a flange 114 (plate portion) formed so as to protrude from the surface of one fin 111 toward the other fin 111. A flange end 114 a on the other fin 111 side of the flange 114 is brought into contact with the other fin 111. The flange 114 is formed by bending a part of the edge of one fin 111 toward the other fin 111.

  The flange 114 formed on one fin 111 is a rectangle having a width L4 and a length L5. One long side is connected to the fin side edge portion 116 of one fin 111, and the other long side is the flange end portion 114a. When a force P <b> 1 is applied so as to narrow the tip portions of the pair of fins 111, the flange end portion 114 a of the flange 114 formed on one fin 111 comes into contact with the fin side edge portion 116 of the other fin 111. .

  As shown in FIG. 3A, each fin 111 of the pair of fins 111 includes a flange 114. That is, one fin member 110 has two flanges. In FIG. 2A, the front side flange 114 has the right fin 111 toward FIG. 2A, and the rear side flange 114 has the left fin toward FIG. 2A. 111 has. As described above, the directions such as “up”, “down”, “left”, “right”, “front”, “rear”, “front”, “back” are written as such for convenience of explanation. However, it does not limit the arrangement or orientation of devices, instruments, parts, and the like.

  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 disc having a predetermined plate thickness. 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, and may be a square, a rectangle, an ellipse, a polygon, or the like according to the shape of the light source module.

  As shown in FIG. 3B, the base member 120 includes a plurality of rectangular 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 and attached to 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, in the case of one opening 124, it includes two openings 124a arranged in a line in series and a blocking part 124b positioned between the two openings 124a.

  In FIG. 3B, the base member 120 has six openings 124 formed in parallel with a blocking portion 124b formed in the center. In this manner, the base member 120 can be prevented from being deformed by forming the blocking portion 124b at the center of the opening 124. In other words, the base member 120 includes twelve openings 124a and six blocking portions 124b.

  As a method for forming the base member 120, for example, a punching process using a press or an ADC may be used.

  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 outer shape of the base member 120, the fin member 110 can be attached to 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 members 110 having the same length can be mounted side by side on the square base member 120 without waste.

  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 attached to the tip of the pair of fins 111 by applying a force P1 pushing from the outside to the inside from both sides, while the interval between the pair of fins 111 is reduced. It is inserted (press-fitted) into the opening 124 from the surface 121 side. When the pair of fins 111 are press-fitted into the opening 124, the pair of fins 111 are arranged perpendicular to the base member 120 and parallel to each other. For example, when the fin member 110 is press-fitted into the base member 120 using a machine, the bottom plate 112 of the fin member 110 is simply press-fitted into the opening 124 without applying a force P1 to the tip portions of the pair of fins 111. It's okay.

  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).

  The flange 114 shown in FIG. 4B is the flange 114 on the rear side in the longitudinal direction (see FIG. 3A). When the fin member 110 is press-fitted into the opening 124 of the base member 120, the flange end portion 114 a of the flange 114 comes into close contact with the fin side edge portion 116 of the other fin 111.

  Let R1 which shows a close_contact | adherence part with a wavy line. In R1, since the flange end portion 114a and the fin side edge portion 116 are in close contact with each other without any gap, heat conduction is improved, and the heat sink 190 (heat sink ASSY) having a large surface area on the outer periphery is efficiently obtained.

  Further, as shown in FIG. 4B, in the heat sink 190, a space 125 is formed between the fin member mounting surface 121 (back surface of the contact surface) and the flange 114 (plate portion).

  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 brought into contact with the inner wall surface 124c in the longitudinal direction of the opening 124 and locked together.

  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.

  As shown in FIG. 5A, the length L5 of the flange 114 and the length L10 (height of the space 125) from the fin member mounting surface 121 of the base member 120 to the flange 114 are approximately L5: L10 = 3: 2. Alternatively, L5: L10 = 2: 3, L5: L10 = 1: 1, L5: L10 = 2: 1, L5: L10 = 1: 2, and the like may be used.

  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. Further, the bottom surface 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. 5 (b), at the wavy line portion R2, the outer surface of the fin 111 and the inner wall surface 124c in the longitudinal direction of the opening 124 come into contact with each other, and the force P2 that maintains the distance between the pair of fins 111 The outer surface of the fin 111 and the inner wall surface 124c in the longitudinal direction of the opening 124 are in close contact with each other. Further, 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 at the wavy line portion R3.

  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.

  FIG. 6 is a diagram showing the flow of air that has flowed into the heat sink 190 from both longitudinal end surfaces of the fin member 110 in the heat sink 190 of the present embodiment. FIG. 7 is a simulation diagram showing the thermal effect of the heat sink 190 of the present embodiment.

  As shown in FIG. 6, the heat sink 190 of the present embodiment has a gap (space portion 125) at the lower end of the fin 111 (fin). This space part 125 realizes an efficient wind flow. The space portion 125 is configured to utilize the effect that the wind flows from the low heat portion to the high heat portion, and to apply the wind to the inside and outside of the fin. Thereby, the outer periphery with good heat exchange can be radiated (heat exchange) more efficiently.

  As shown in FIG. 6, the wind that has entered the space portion 125 from both longitudinal end surfaces of the fin member 110 flows upward in a space portion surrounded by the flange 114 in the heat sink 190. During this time, the heat of the fin member 110 is efficiently radiated. Since the surface area of the fin member 110 is also increased by the flange 114, the heat capacity of the heat sink 190 can be increased.

  7, the heat sink 190 (FIG. 7A) according to the present embodiment and the heat sinks 210 (FIG. 7B), 220 (FIG. 7C), and 230 (FIG. 7D) of the comparative example. ) Is compared with the results. The heat sink 210 is cylindrical. The heat sink 220 has a rib formed inside a cylindrical shape. The heat sink 230 has a shape in which a cutout is provided on the outer peripheral surface of the heat sink 220.

  FIG. 7E is a table showing simulation results showing the heat dissipation effect of the four heat sinks 190, 210, 220, and 230. As shown in FIG. 7E, when the LED temperature increase rate of the heat sink 190 according to the present embodiment is 1, the heat sink 210 has a rate of 1.459, the heat sink 220 has a rate of 1.419, and the heat sink 230 Was a ratio of 1.320. Thus, it can be seen that the heat sink 190 according to the present embodiment has a high heat dissipation effect.

  In the present embodiment, the flanges 114 are provided at both longitudinal ends of the fins 111, but other configurations may be used. For example, you may provide the flange 114 (plate part) so that it may protrude from the center part of the surface inside the fin 111. FIG. In addition, the flange 114 (plate portion) may be formed by cutting the fin 111 and bending the fin 111 toward the other fin 111 side.

  As described above, according to the heat sink 190 according to the present embodiment, when assembled to the heat sink ASSY (heat sink 190), the heat sink fin (fin member 110) is pressed into the heat sink base (base member 120) to be stronger. Therefore, the heat sink fin is formed in advance so that the tip portion is in an expanded state. This eliminates thermal resistance between the heat sink base and the heat sink fins.

  Furthermore, when the heat sink fins are press-fitted into the base member and the tip portions of the pair of fins are in the expanded state from the expanded state (that is, the pair of fins are perpendicular to the base member), The flange provided on the upper side of the fin one side is in contact with the fins without any gap and heat conduction is improved, and the heat sink ASSY having a large surface area is efficiently provided on the outer periphery. Further, when the light source module 140 is in direct contact with the heat sink fin of the heat sink ASSY that is firmly attached, there is no thermal resistance and heat can be radiated more efficiently.

  As described above, the heat sink according to the present embodiment includes a reflector that functions as a light source unit and a fixing and reflecting plate, a light distribution, and a frame that has a mounting spring that controls the light emission angle and can be fixed to the ceiling. A power supply device BOX (lighting device) for supplying power and a heat sink structure for heat radiation of the light source module are composed of two aluminum sheet metal parts. In addition, the heat sink according to the present embodiment has a substantially U-shaped (substantially U-shaped, substantially V-shaped) sheet metal press-fitted into a square hole of a flat plate, and has a substantially U-shaped section (approximately U) arranged in parallel. (Character-like, substantially V-shaped) A feature is that a part of both ends of a sheet metal fin is bent.

  Therefore, according to the heat sink according to the present embodiment, the heat sink structure for heat dissipation of the light source module is composed of two parts of the aluminum sheet metal, and it has a simple shape and does not require a mold, and is a structure that can be easily assembled at low cost. Since it can be configured with a uniform wall thickness and is lighter in weight than the current ADC, it greatly contributes to improvement in mounting properties and the like. In addition, heat resistance can be efficiently radiated by a structure that directly contacts a heat sink substrate with a substantially U-shaped (substantially U-shaped or substantially V-shaped) sheet metal fin of the heat sink. In addition, it is proposed to provide a heat sink that can secure a surface area with a simple structure and that can perform heat radiation efficiently with light weight. The performance of the heat sink as described above can be improved simply and inexpensively using sheet metal.

  In addition, according to the heat sink according to the present embodiment, a part of both ends of a substantially U-shaped (substantially U-shaped, substantially V-shaped) sheet metal fin is a bent flange, and there is a gap at the lower end of the flange. It is characterized by. This gap is a structure that forms a flow path for air (from the outer periphery to the inner surface). Therefore, the outer peripheral surface with the best heat exchange property can be secured and the secured outer peripheral surface can be used, the flow rate UP due to the tunnel effect can be expected, and heat can be radiated more efficiently.

  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, 114 Flange, 114a Flange end part, 115 Fin cut part, 116 Fin side edge, 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, 124d short inner wall, 125 Space part, 130 Substrate holder, 140 Light source module, 141 Mounting surface back surface, 142 Mounting surface, 150 Light diffusion cover, 160 Reflecting portion, 161 Mounting spring, 162 Reflector, 163 Frame, 170 LED, 171, 172 Screw, 180 Heat dissipation Sheet 190 heat sink.

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 dissipating member having a predetermined thickness provided with a close contact surface that is in close contact with the back surface of the mounting surface, and having an opening that penetrates from the close contact surface to the back surface of the close contact surface;
A fin member comprising a bottom plate and a pair of fins formed by bending both lateral edges of the bottom plate in the short direction, the bottom plate being inserted into the opening and the pair of pairs A fin member projecting from the opening,
The pair of fins is
A heat sink, wherein a flange whose tip abuts against the other fin is provided at an end edge of one fin.   The heat sink according to claim 1, wherein the fin member has a gap formed between each flange and the heat radiating member.   The heat sink according to claim 1 or 2, wherein the flange is formed by bending an edge of each fin of the pair of fins.   The pair of fins is formed in advance so that tip portions thereof are in an expanded state with respect to the bottom plate, and the pair of fins are brought into close contact with the inner wall surface of the opening by being press-fitted into the opening. The heat sink according to any one of claims 1 to 3.   5. A lighting fixture comprising: the heat sink according to claim 1; a light source substrate attached to the heat sink; and a lighting device that turns on a light source included in the light source substrate.

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