JP2014044900A - Heat sink and led lighting device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new and high-performance heat sink can be used with a vibration film type blower unit assembled thereto, and to provide an LED lighting device which uses the heat sink.SOLUTION: A heat sink 1 includes: a plate-like base part 11 coupled to a heating element; a columnar protruding part 12 which is formed protruding from a center part of the base part toward an upper end of the heat sink; and multiple fins 10 which are erected from a peripheral part of the base part, protrude to the upper end of the heat sink so as to enclose the columnar protruding part, and are connected with the columnar protruding part. A vibration film type blower unit is assembled to an area above the columnar protruding part so that multiple intake/exhaust ports face the multiple fins. An LED lighting device includes the heat sink 1 and uses an LED module as the heating element.

Description

  The present invention relates to a heat sink that is used with a diaphragm-type air blowing unit attached thereto, and an LED lighting apparatus using the heat sink.

  Recently, various lighting fixtures using LEDs (light emitting diodes) as light sources have been sold. Although LED is said to have high luminous efficiency and inherently low heat generation, some LED modules employed in lighting fixtures are of high power type that consumes several tens of watts. Such a high power type LED module generates a large amount of heat and needs to be cooled. However, in a configuration in which such a high-power LED module is naturally air-cooled only with a heat sink, a large heat sink is required, and thus there is a problem that the lighting fixture becomes large. On the other hand, in the configuration in which the rotary fan is attached to the heat sink and the high-power LED module is forcibly air-cooled, the lighting fixture can be reduced in size, but on the other hand, the operating noise is large and the rotary fan deteriorates with time. Another problem arises.

  Examples of the prior art for the above-described problem in forced air cooling include the following. Specifically, as shown in FIG. 8, Japanese Patent Application Laid-Open No. 2004-133620 proposes a vibration membrane type air blowing unit (synthetic jet actuator) 200 attached to a heat sink 100 instead of a rotary fan. The diaphragm-type blower unit 200 is compact because it sucks air from the intake / exhaust port 200a by the vibration of the diaphragm provided in the air chamber and blows it out to the fins 100a formed on the heat sink 100. Since no sound is generated and the fan shaft is not provided, there is an advantage that the bearing of the fan shaft does not wear and the service life is long.

  In addition, as shown in Non-Patent Document 1, the applicant of Patent Document 1 has developed and sold various LED cooling systems (SYNJET series registered trademarks) in which a diaphragm-type air blowing unit and a heat sink are combined.

Special table 2009-515342

Dr. Markus Schwickert CRE, Director of Reliability, Nuventix, March, 20, 2012, IndustrialCooling With Nuventix SynJet ® Technology and Complementary LED Heat Sinks, DigiKey TechZone (http://nuventix.wpengine.netdna-cdn.com/wp-content/ uploads / 2012/03 / TechZone-Industrial-Cooling-With-Nuventix-SynJet-Technology-and-Complementary-LED-Heat-Sinks.pdf)

In general, the heat dissipation amount of the heat sink (mainly the heat dissipation amount of the fins) increases substantially in proportion to the difference between the fin temperature and the air temperature (<fin temperature). Also, as the temperature of the heating element rises (and as a result, the temperature of the fin rises), when the fin reaches a certain temperature, the amount of heat released by the fin and the amount of heat generated by the heating element are balanced. . At this time, the temperature of the heating element depends on the temperature of the fin. Here, when the heating element is a device such as an LED module, the device needs to be maintained in a temperature range that can ensure normal operation.
However, the heat sink presented in Patent Document 1 and Non-Patent Document 1 has a simple structure in which a plurality of fins are connected around a cylindrical body having a bottom surface coupled to a heating element. There was room for improvement to make a high-performance heat sink. Accordingly, an object of the present invention is to provide a new and high-performance heat sink using a diaphragm-type air blowing unit and an LED lighting apparatus using the heat sink.

  The heat sink according to the present invention is a heat sink that is used by assembling a diaphragm-type air blowing unit in which a plurality of intake and exhaust ports are arranged in a circumferential shape, and includes a plate-like base portion coupled to a heating element and a central portion of the base portion. Columnar protrusions projecting toward the upper end side of the heat sink, each rising from the peripheral edge of the base, and projecting to the upper end side of the heat sink so as to surround the columnar protrusion, to the columnar protrusion A plurality of fins connected to each other, and the diaphragm-type air blowing unit is mounted above the columnar protrusion with the plurality of air intake / exhaust ports directed toward the plurality of fins.

  A recess formed by lowering the upper ends of the columnar protrusions toward the plate-like base side than the upper ends of the plurality of fins may be used as a blower unit accommodating recess.

  The columnar protrusion may be formed with a hollow recess having an upper end opened.

  The columnar protrusion may form a central shaft portion and a plurality of partition walls protruding radially outward while holding a gap on the outer periphery of the shaft portion.

  The plurality of partition walls may be directly connected to correspond to each of the plurality of fins.

  An inclined surface that decreases toward the outer side of the heat sink may be formed on the peripheral edge of the base where the plurality of fins rise.

  The cooling fin is surrounded by adjacent fins, and includes a cold air passage extending from the upper end of the fin as a starting end and the lower end of the fin as an end, and the cooling air passage is provided on the lower end side of the cooling passage. Small fins that separate along the traveling direction may be arranged.

  The LED lighting apparatus according to the present invention includes the heat sink, and the LED module is the heating element.

  According to the present invention, an air flow is blown from a blower unit into a cold air passage constituted by a plurality of fin gaps, and is cooled by passing it. Each of the fins constituting the cool air passage projects upward with the base side of the heat sink as the lower end, the blower unit side as the upper end and surrounding the columnar protrusion, and further from the center of the base of the heat sink to the upper end of the heat sink It is connected to the protruding columnar protrusion. Therefore, a part of the heat generated in the heating element not only directly moves from the base of the heat sink to the fins, but also moves to the fins using the columnar protrusions as bypass paths. Therefore, the heat transfer path from the heating element to the fins is greater than the heat sinks described in Patent Document 1 and Non-Patent Document 1, and the heat dissipation efficiency of the heat sink is improved.

  In addition, a hollow recess is formed at the upper end of the columnar protrusion, or a shaft portion is arranged at the center, a gap is formed on the outer periphery of the shaft portion, and a plurality of partition walls are formed radially outward. The material of the heat sink can be saved by the volume of the hollow recess or gap, the cost is reduced, and the weight is reduced. Further, the columnar protrusions can be formed largely with the same material, and since the columnar protrusions are exposed to the air flow, the heat dissipation action is performed in the same manner as the fins.

  In the case where the end of the cool air passage surrounded by the adjacent fins, that is, the rising end from the heat sink base of the fin, is formed with an inclined surface that decreases outwardly of the heat sink, it is injected from the intake / exhaust port of the blower unit. The air flow is guided to the inclined surface and discharged smoothly to the outside. In other words, the heat dissipation efficiency of the heat sink is greatly improved because it does not bounce backward in the reverse direction at the end of the cold air passage.

  In the configuration in which a small fin that separates the cold air passage along the traveling direction is disposed on the end side of the cold air passage that is surrounded by the adjacent fins, the cold air passage in that portion is narrowed by the small fin. The flow velocity increases, so that the air discharged from the cooling passage is less likely to be sucked and circulated again into the blower unit, and the heat dissipation efficiency is further improved.

1 is an overall perspective view showing a first embodiment of a heat sink according to the present invention. (A) is a front view of the heat sink shown in FIG. 1, (b) is a rear view thereof, (c) is a plan view thereof, (d) is a rear view thereof, and (e) is a right side view thereof. It is a whole perspective view which shows a vibration membrane type ventilation unit. It is a disassembled perspective view of one Example of the LED lighting fixture by this invention. It is a whole perspective view which shows the 2nd embodiment of the heat sink by this invention. (A), (b) is a top view explaining other embodiment of the heat sink by this invention, respectively. It is a longitudinal cross-sectional view for demonstrating the cooling principle (air flow) in the heat sink by this invention. It is a figure which shows the cross-section of the conventional heat sink used by assembling | attaching a vibration membrane type ventilation unit.

<First Embodiment>
1 and 2 show an example of a heat sink according to the present invention. Such a heat sink 1 is used for the purpose of cooling a heating element such as an LED unit by assembling a vibrating membrane type air blowing unit (see FIG. 3) described later. Here, the heating element (not shown) is not limited to the LED unit, and various devices such as a CPU are applicable as long as they generate heat during operation. When the heat sink 1 is used in an LED lighting apparatus, the LED module that is the light source serves as a heating element for the heat sink 1.

  The diaphragm-type air blowing unit is available, for example, as SYNJET (registered trademark) of Nuventix, USA. Further, the diaphragm-type air blowing unit is generally provided with an air chamber (not shown) that communicates with the outside through an intake / exhaust port, and the inside is divided by a diaphragm (not shown) similar to a cone paper of a dynamic speaker. It has a structure. When the vibrating membrane vibrates at a frequency of, for example, about 60 to 80 Hz, the pressure of the air chamber periodically varies, and intake and exhaust of the air chamber are performed through the intake and exhaust ports. In the intake process, the air in the vicinity of the intake / exhaust port is just sucked in, and no special air flow is generated, but in the exhaust process, air is discharged from the intake / exhaust port at a high speed, A strong air flow is generated in the direction in which the air is discharged.

  FIG. 3 shows a specific example of a vibrating membrane air blowing unit (hereinafter simply referred to as “air blowing unit”). The illustrated blower unit 2 has a substantially cylindrical shape. More specifically, the blower unit 2 includes a substantially cylindrical main body 21 and a flange portion 22 that projects from the upper end side (the upper side in FIG. 3) of the main body 21. A vibration film (not shown) is provided inside the main body 21. The flange portion 22 has a substantially trapezoidal shape when viewed from the side. A plurality of intake / exhaust ports 20 are circumferentially arranged at a predetermined interval on the surface facing the lower end side of the flange portion 22, and air flows from the intake / exhaust ports 20 toward the lower end side of the main body 21. Is ejected.

  A power supply and control signal connection terminal portion 23 is provided on the bottom surface of the main body 21 (lower side in FIG. 3). Further, a through hole 24 through which a screw for fixing the blower unit 2 to the heat sink 2 passes is formed in the flange portion 22.

  The heat sink 1 is manufactured, for example, as a die-cast product such as aluminum or copper, and the entire shape including the fins 10 and 10a has a substantially cylindrical shape narrowed on the upper side. Therefore, each of the fins 10 and 10a has a pentagonal shape in which the upper piece is formed smaller than the lower piece. The heat sink 1 is provided with a disk-shaped plate-like base portion 11 on the lower end side (lower side in FIG. 1), and from the center portion of the base portion 11 toward the upper end side (upper side in FIG. 1) of the fins 10 and 10a. The plurality of fins 10, 10 a project from the base 11 toward the upper end side and are connected to the columnar protrusion 12 so as to surround the columnar protrusion 12. ing. The heat sink 1 is not limited to a cylindrical shape as shown in the figure, and may be a polygonal column shape.

  Of the plurality of fins 10, 10 a, the fin 10 a is formed thicker than the fin 10, and a screw hole 51 is formed in the upper end 10 c, which serves as a fixing portion that fixes the blower unit 2. Therefore, the blower unit 2 is assembled to the heat sink 1 by screwing screws (not shown) into the screw holes 51. In this embodiment, two of the three fins 10a are arranged at positions facing each other across the columnar protrusion 12, and the remaining one is arranged at a position equidistant from the two fins 10a. The number of fins 10a and the installation position can be arbitrarily selected.

  The columnar projection 12 is formed to have a smaller diameter than the main body 21 of the blower unit 2, and the upper end 12 f of the columnar projection 12 is formed lower than the upper end 10 c of the fins 10, 10 a surrounding the columnar projection 12. Thus, a recess is formed in the heat sink 1, and this recess serves as an accommodation recess 14 for accommodating the blower unit 2. It is desirable that the blower unit 2 ensure a certain gap without being in close contact with the upper end 12f of the columnar protrusion 12 in order to block heat conduction from the columnar protrusion 12.

  When the blower unit 2 and the upper end 12f of the columnar protrusion 12 are in close contact with each other, the blower unit 2 is heated by heat conduction, and as a result, hot air is discharged from the intake / exhaust port 20 to inhibit the cooling effect. The Moreover, if the air blower unit 2 is heated, problems such as shortening the life of the air blower unit 2 occur.

  The columnar protrusion 12 in the illustrated example includes a shaft portion 12a disposed at the center of the base portion 11, and a plurality of partition walls 12c extending radially outward from the outer peripheral surface of the shaft portion 12a. A gap 12b is formed between the partition walls 12c. Here, the columnar protrusion 12 may be configured only by the shaft portion 12a. In this case, each of the plurality of fins 10 and 10a rising from the base portion 11 side has its inner end 10e at the shaft portion 12a. Connect as it is. Moreover, the hollow heat sink 12e (refer FIG. 6 (a), (b)) forms in the upper end 12f of the axial part 12a, and the weight reduction of the heat sink 1 can be achieved.

  The heating element is thermally coupled to the surface of the base 11 opposite to the surface on which the columnar protrusions 12 are provided, and is cooled. As shown in FIG. 2 (d), a power line hole 15 having a substantially rectangular extension and three screw holes 11a are formed on this surface to which the heating element is coupled. The portions 12 are arranged so as to avoid the power line holes 15.

  The air jetted from the blower unit 2 becomes an air flow and passes through the cold air passage S constituted by the fins 10 and 10a adjacent to each other. In the cool air passage S, the upper end 10c side of the fins 10 and 10a adjacent to the intake / exhaust port 20 of the blower unit 2 is the start end, and the lower end 10b side is the end thereof. The air flow generated by the blow unit 2 is the cool air passage S. As a result, the fins 10 and 10a are cooled.

Integrated. In addition, an inclined surface 19 that is inclined toward the outer side of the heat sink 1 is formed at the end of the cold air passage S, that is, at the peripheral edge of the base 11 where the plurality of fins 10 and 10a rise. Thus, the air flow that has passed through the cold air passage S toward the base 11 can be guided by the inclined surface 19 and can be smoothly discharged to the outside. According to such a structure, it is possible to avoid or suppress the air flow from bouncing back at the base portion 11, so that the cooling effect of the heat sink 1 is improved. To do. Each of the fins should have a base,

  Further, each of the fins 10 and 10a is formed such that the upper end 10c side is thinner than the lower end 10b side, so that the opening area of the cooling passage S becomes wider near the intake / exhaust port 20 of the blower unit 2, The air blowing unit 2 can easily suck the air around the heat sink 1. In the example shown in the figure, the fins 10 and 10a are all flat thin plates, but may be curved plates or corrugated plates.

  Moreover, since the opening area of such a cool air passage S is narrower toward the end side and wider toward the start end side, the airflow flowing through the cool air passage S becomes faster toward the end side. As a result, the air flow heated while flowing in the cold air passage S is vigorously discharged far away from the heat sink 2.

  In the example shown in the figure, the partition wall is a mixture of 12c connected to the fin 10 from the shaft portion 12a and 12c 'branched to two on the way to the fin 10, If the partition wall has such a structure, there is no portion in which the gap between the adjacent partition walls 12c and 12c ′ becomes extremely narrow, so that it is easy to perform die cutting when manufacturing the heat sink.

  FIG. 4 is an exploded perspective view of an example of the LED lighting apparatus 3. The illustrated heat sink 1 is substantially the same as that shown in FIGS. 1 and 2, except that a step 10d described later is provided. The blower unit 2 is shown in FIG.

  The LED lighting device 3 includes an LED module 30, a hood portion 31, a heat sink 1, and a blower unit 2.

  As shown in FIG. 4, the blower unit 2 has step portions 10 d formed on the upper ends 10 c of the fins 10 and 10 a that define the outer periphery of the housing recess 14. The flange portion 22 of the blower unit 2 is inserted into the annular portion formed by these stepped portions 10d and is accommodated in the accommodating recess 14 in the vertical direction, and the intake / exhaust port 20 is the fin 10 forming the cold air passage S. 10a. Therefore, the air flow generated from the blower unit 2 flows from the start end to the end of the cool air passage S, is changed in direction by the inclined surface 19 of the base 11, and is discharged to the outside of the heat sink 1. By forming such a stepped portion 10d, the work of assembling the blower unit 2 to the heat sink 1 can be facilitated. Further, since the step portion 10d is formed, the heat sink 1 can have a larger surface area than the case where the step portion 10d is not formed, and the cooling effect is improved. Further, since the step portion 10d is formed, the intake and exhaust ports 20 adjacent to each other can be separated in a wider range than when the step portion 10d is not formed. The flow of air can be adjusted. Thus, the cooling effect is improved.

  The LED module 30 has a substrate 30b made of glass or epoxy, on which five LED chips 30a are mounted, and a disc-shaped metal base 30c to which the substrate 30b is fixed. Are fixed with screws 30d. The contact surface where the metal base 30c and the base 11 are in contact with each other may be as smooth as possible. Further, the contact surface may be improved in adhesion by discharging air, for example, by applying silicon grease. If the degree of adhesion between the two is high, the thermal coupling between the LED module 30 and the heat sink 1 becomes more reliable.

  A power connector (not shown) is led out from the back side of the metal base 30c by a lead wire, and the power connector is connected to a power line (not shown) introduced from the outside of the heat sink 1 through the power line hole 15. Is done. The power supply hole 15 is sufficiently wide to be inserted through the power supply connector.

  The hood portion 31 is a cylindrical die-cast product made of, for example, aluminum, and provided with optical components (not shown) such as a mirror for reflecting the irradiation light of the LED chip 30a and a light distribution adjusting lens. ing. The hood portion 31 is also provided with a pair of leg portions 31a (only one side is shown in FIG. 4) for fixing to the heat sink 1 with screws 5.

  Next, the cooling principle of the LED module 30 in the LED lighting apparatus 3 will be described. When the LED chip 30a is turned on, the heat generated by the LED chip 30a moves from the substrate 30b to the heat sink 1 along a path determined by the temperature gradient. If the LED chip 30a, the substrate 30b, the metal base 30c, and the heat sink 1 reach a uniform temperature, the heat does not move, but the fins 10 and 10a are cooled by heat exchange with the air flow generated by the blower unit 2. Since the temperature is lower than the other parts, the temperature gradient is maintained, and as a result, the LED module 30 is continuously cooled.

  The columnar protrusion 12 serves as a bypass path for the heat transfer path conducted from the heating element (not shown) to the fins 10 and 10a. The heat of the heating element is transmitted through the lower ends 10b of the fins 10 and 10a and the inner end 10e side. That is, a part of the heat reaching the base part 11 is transmitted to the inside of the fins 10 and 10a through the lower ends 10b of the fins 10 and 10a, but another part of the heat moves inside the columnar protrusions 12 and further to the fins. 10 and 10a through the inner ends 10e of the fins 10 and 10a. Due to such an action, the heat of the heating element moves to each of the fins 10 and 10a at a high speed, so that each of the fins 10 and 10a is maintained at a high temperature and excellent in heat dissipation. If the cross-sectional area of the columnar protrusion 12 is increased, a greater amount of heat moves through the columnar protrusion 12, so that the structure without such a columnar protrusion 12 (see FIG. 8), etc. Compared with, the heat dissipation efficiency is also improved.

  The air flow generated by the blower unit 2 passes through the gap between the fins 10, 10 a forming the cool air passage S, mainly the portion immediately below the intake / exhaust port 20, and enters the base 11 at the end of the cool air passage S. When it reaches, it is guided to the inclined surface 19 and discharged to the outside. Here, considering the movement of the air flow, in the structure without the columnar protrusions 12 and the partition walls 12c, the inner space surrounded by the fins 10 and 10a has a donut shape, and air is blown from the outer periphery thereof. A circulating flow is generated in the same direction as the air flow generated by the unit 2 and the air flows in the opposite direction in the center. This circulating flow can be understood as an analogy of the cigarette smoke ring discharged by the smoker. In addition, it becomes very stable. As a result, the air flow generated by the blower unit 2 always includes a part of such a circulating flow, resulting in a high temperature and a reduced heat dissipation efficiency. However, according to the present invention, since each of the fins 10 and 10a is connected to the base 11 and the columnar protrusion 12, the circulation flow does not have a donut shape as described above, and is smaller and weaker. become. Therefore, since the circulation flow included in the air flow generated by the blower unit 2 is also reduced, the heat dissipation efficiency is improved.

<Second Embodiment>
The heat sink 1 shown in FIG. 5 is another embodiment of the present invention.

  In the heat sink 1, the columnar protrusion 12 is directed outward between the shaft portion 12a, the outer peripheral wall 12d concentrically surrounding the shaft portion 12a at a predetermined interval, and the shaft portion 12a and the outer peripheral wall 12d. And a plurality of partition walls 12c extending radially. Each of the fins 10 and 10a is directly connected to the outer peripheral wall 12d at a position corresponding to the partition wall 12c. With this structure, the shaft portion 12a, the partition wall 12c, and the outer peripheral wall 12d are all heat transfer paths.

  A hollow recess 12e is formed in the upper end 12f of the shaft portion 12a. The depth of the hollow recess 12e is not particularly limited. With such a structure, the surface area of the heat sink 1 can be increased, and the cooling effect is improved. Further, with such a structure, the material of the heat sink 1 can be saved, the cost can be suppressed, and the columnar protrusion 12 having a larger diameter can be formed with the same amount of material. Further, the shape, number and arrangement of the hollow recesses 12e are not particularly limited, but heat can be evenly distributed to the fins 10 if formed symmetrically with respect to the shaft portion 12a.

  Also in this embodiment, a single partition wall is maintained, and a portion 12c from the shaft portion 12a toward the outer peripheral wall 12d and a portion 12c ′ branched into two in the middle are mixed, and the respective front ends thereof are mixed. The portion is directly connected to each of the fins 10 and 10a. Therefore, since the heat of the shaft portion 12a quickly reaches the fins 10 and 10a, the heat dissipation efficiency is also excellent. In addition, when the two types of partition walls 12c and 12c ′ are mixed to make the gaps 12b substantially uniform, the die-cutting work when the heat sink 1 is manufactured by die casting becomes easy.

  Further, small fins 10f that separate the cold air passage S along the traveling direction thereof, that is, the traveling direction of the air flow, are disposed on the lower ends of the cold air passages S, respectively. Each of the small fins 10f separates the cold air passage S at the center and is connected only to the base portion 11, but may be connected to both the base portion 11 and the columnar protrusion 12. The small fin 10f contributes to the heat dissipation action and narrows the opening area of the cold air passage S defined by the fins 10, 10a and the outer peripheral wall 12d, and depressurizes and accelerates the air flow passing through the narrowed portion. If the air flow becomes faster, the air flow can be strongly discharged from the inclined surface 19 of the base 11 to the outside, so that the blown unit 2 can be prevented from sucking the discharged air again. As a result, the air blowing unit 2 The temperature of the air exhaled becomes low.

  The other constituent elements are the same as those shown in FIGS. 1 and 2, and will not be described with common reference numerals.

  FIG. 6 is a modification of the columnar protrusion 12. In FIG. 6A, eight hollow recesses 12e having a circular cross section are arranged at equal intervals on the upper end 12f of the solid columnar protrusion 12, and in FIG. 6B, a larger number of hollow recesses 12e are arranged. The hollow recesses 12e are randomly distributed on the upper end 12f. Both are advantageous in terms of saving material and reducing weight. These modifications are merely examples, and various other modifications are possible.

  FIG. 7 specifically shows the cooling principle of the LED lighting apparatus using the heat sink 1 of the present invention. The main body 21 of the blower unit 2 is housed in the blower unit housing recess 14 formed at the upper end of the heat sink 1, and the flange 22 of the blower unit 2 is an annular portion formed by the step portion 10 d formed at the upper end 10 c of the fin 10. It is fitted and fixed to. Reference numeral 31b denotes a light distribution adjusting lens, and reference numeral 31c denotes a mirror. Parts corresponding to those in FIG. 4 are denoted by the same reference numerals, and description thereof is omitted.

  A in the figure indicates a weak flow of air sucked by the blower unit 2, and B indicates a strong airflow caused by the air discharged by the blower unit 2. The air flow B is generated in the vicinity of the intake / exhaust port 20 of the blower unit 2, and this is a mixture of air ejected from the blower unit 2 and air entrained from the vicinity thereof. The air flow B is blown into the cold air passage S formed by the gap between the adjacent fins 10 and 10f, collides with the inclined surface 19 formed at the end of the cold air passage S, and is discharged to the outside. On the way, heat is exchanged with the fins 10 and 10f and the outer peripheral wall 12d to cool them, and at the same time, the air flow B itself becomes hot. On the other hand, the gap 12b formed in the columnar protrusion 12 on the inner side of the fin 10 is completely separated from the air flow B by the outer peripheral wall 12d. Absent.

DESCRIPTION OF SYMBOLS 1 Heat sink 10, 10a Fin 10f Small fin 11 Base 12 Columnar protrusion 12a Shaft part 12b Gap 12c, 12c 'Partition wall 12d Outer wall 12e Hollow recess 14 Blow unit accommodation recessed part 2 Blow unit 20 Intake / exhaust port 3 LED lighting fixture 30 LED module

Claims (8)

In a heat sink that is used by assembling a vibrating membrane air blower unit in which a plurality of intake and exhaust ports are arranged in a circle,
A plate-like base coupled to the heating element;
A columnar protrusion formed to protrude from the center of the base toward the upper end of the heat sink;
Each includes a plurality of fins rising from the peripheral edge of the base and projecting to the upper end side of the heat sink so as to surround the columnar protrusion and connected to the columnar protrusion.
The heat sink according to claim 1, wherein the diaphragm-type air blowing unit is mounted above the columnar protrusion with the plurality of air intake / exhaust ports directed toward the plurality of fins. The heat sink according to claim 1.
A heat sink, wherein a recess formed by lowering the upper ends of the columnar protrusions toward the plate-like base side than the upper ends of the plurality of fins is used as a blower unit accommodating recess. The heat sink according to claim 1 or 2,
The columnar protrusion is a heat sink in which a hollow recess having an upper end opened is formed. The heat sink according to claim 3,
The columnar protrusion is a heat sink, wherein a central shaft portion and a plurality of partition walls projecting radially outward are formed with a gap held on the outer periphery of the shaft portion. The heat sink according to claim 4,
The heat sink having a structure in which the plurality of partition walls are directly connected to each of the plurality of fins. In the heat sink in any one of Claims 1-5,
The heat sink which forms the inclined surface which falls to the outer peripheral side of the said heat sink in the said peripheral part of the said base which the said several fins stand up. In the heat sink in any one of Claims 1-6,
The cooling fin is surrounded by adjacent fins, and includes a cold air passage extending from the upper end of the fin as a starting end and the lower end of the fin as an end, and the cooling air passage is provided on the lower end side of the cooling passage. A heat sink in which small fins that are separated along the direction of travel are arranged. An LED lighting apparatus comprising the heat sink according to claim 1, wherein an LED module is the heating element.

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