JP2011108493A - Heat radiating body of bulb-shaped led illumination lamp, and forming method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat radiating body of a bulb-shaped LED illumination lamp capable of attaining heat radiation efficiency for restraining temperature rise of an LED in a simple structure, and yet, reducing manufacturing cost. <P>SOLUTION: The heat radiating body 1 is located between a base 4 of an electric bulb arranged at a base end side 1a and a printed circuit board 5 where a plurality of LEDs 6 arranged at an opening end side 1b are mounted on the top surface side. The heat radiating body 1 is formed in a hollow cylindrical shape by extruding or drawing of aluminum with excellent heat conductivity, a plurality of protruding fins 2 are formed on an outer periphery, and a storage portion 3 for storing a power supply section which generates a power source of the LEDs 6 is formed in the hollow inside of the heat radiating body 1. The protruding fins 2 are formed in a protruded shape so as to gradually enlarge height from the outer periphery from the base end side 1a to the opening end side 1b, and an end face of the protruding fin 2 at the opening end side 1b is formed in a plane so as to make a back surface side of the metallic printed circuit board 5 face-bond with it. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a heat radiating body for a bulb-type LED lighting, and more particularly to a heat radiating body for suppressing a temperature rise of an LED.

  In recent years, there has been an increasing demand for illuminating lamps using light-emitting diodes (hereinafter abbreviated as LEDs), which have low power consumption, in order to reduce environmental problems, particularly carbon dioxide. It is known that the lifetime of an LED shortens as the light output decreases as the temperature rises. For this reason, in the lamp | ramp which uses LED as a light source, it is calculated | required to suppress the temperature rise of LED. Conventionally, in consideration of such demands, there is known an LED bulb that includes a heat radiating portion for releasing heat transmitted from an LED to the outside and exposes the heat radiating portion to the outside.

  For example, in the LED bulb described in Japanese Patent Laid-Open No. 2001-243809 (Patent Document 1), an LED is mounted on the outer surface of a metal substrate provided inside a substantially spherical body, and a base is provided on one end of the substantially spherical body. The other end is provided with a metal heat dissipating portion having a trumpet shape toward the opening, and a translucent cover attached to the opening. Moreover, the light bulb shaped LED lamp described in Japanese Patent Application Laid-Open No. 2006-313717 (Patent Document 2) is adapted to conduct heat to a light source mounting portion of a metal outer member (heat radiating portion) having a peripheral portion exposed to the outside. LED board mounted with LED mounted, the heat of the LED board is conducted to the peripheral part through the light source mounting part of the metal outer member, and the temperature rise of the LED board is suppressed by enhancing the heat-wrapping effect It is described to do.

  Since the heat dissipating parts described in these Patent Documents 1 and 2 are formed in a trumpet shape, the heat dissipating area is small, so the heat dissipating efficiency for releasing the heat transmitted from the LED to the outside is reduced. In particular, in a high-brightness LED that requires a large current to flow, it may not be possible to suppress an increase in temperature due to high-temperature heat generation.

  For this reason, a heat radiating portion in which heat radiating fins are formed on the outer surface has been proposed. For example, in paragraph 0028 of JP 2009-170114 A (Patent Document 3), a lighting circuit for lighting a blue LED element is built in a hollow interior, and a heat radiating portion provided with a plurality of heat radiating fins on a side surface portion. It is described that the heat of the blue LED element of the LED module is transferred to the plurality of heat radiation fins through the heat radiation plate and radiated from the plurality of heat radiation fins.

  Moreover, as a heat radiating part having a heat radiating fin formed on the outer surface, paragraphs 0024 and 0025 of Japanese Patent Laid-Open No. 2006-40727 (Patent Document 4) include, for example, aluminum that houses a metal printed wiring board on which an LED is mounted. On the outer peripheral surface of the head portion of the container made of metal, it is described that a large number of radiating fins that are long in the vertical direction are provided to protrude at equal intervals along the circumferential direction.

Japanese Patent Laid-Open No. 2001-243809 JP 2006-313717 A JP 2009-170114 A JP 2006-40727 A

  The heat dissipating part and the container shown in Patent Document 3 and Patent Document 4 described above have a large heat dissipating area by forming heat dissipating fins on the outer peripheral surface. However, the temperature rise can be suppressed. However, although there is no description referring to the heat dissipating part and the heat dissipating fins, it is presumed that the hollow mortar-shaped part having a large number of fins on the surface is formed by aluminum die casting from the illustrated structure and shape.

  However, although aluminum die casting is a well-known general forming means, it is not always preferable to use aluminum die casting as a heat radiating member. That is, the aluminum die-casting adds several kinds of metals such as zinc, tin, and manganese in addition to the aluminum material. For this reason, the thermal conductivity of aluminum die-casting is about 96 W / m · ° C., which is much lower than the thermal conductivity of about 230 W / m · ° C. of the aluminum metal plate material.

  By the way, according to the result of research on aluminum heat-dissipating bodies made of aluminum die-casting for LED bulbs conducted by a public industrial technology center, some LED bulbs such as high-intensity LEDs cannot catch up with heat and the LED life is reduced. Therefore, it is reported that measures have been taken to increase the heat dissipation area by increasing the size of the body and increasing the number of fins. As described above, the use of the heat radiating portion made of aluminum die-casting increases the weight and volume, and even if the light source is downsized as an LED, the heat radiating structure becomes large, and thus there is a problem that the size cannot be reduced.

  Also, when manufacturing heat dissipation parts by aluminum die-casting, many processes are required such as melting the aluminum alloy at high temperature, injecting it into a die-cast mold, and then removing unnecessary parts and surface finishing. In addition, there is a problem that the manufacturing cost becomes high.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a heat dissipation body for a light-emitting diode illuminating lamp that has a simple structure and can achieve heat dissipation efficiency that can suppress an increase in the temperature of the LED and that can reduce the manufacturing cost. There is to do.

In order to solve the above-mentioned problems, a light-emitting body of a bulb-type LED lighting lamp according to the present invention has a bulb base provided on the base end side and a plurality of LEDs provided on the opening end side mounted on the surface side. A heat sink interposed between the printed wiring board and
The heat radiator is formed into a hollow cylindrical shape by extruding or drawing aluminum with good thermal conductivity, a plurality of jetty fins are formed on the outer periphery, and the power source of the LED is generated inside the hollow A storage unit for storing the power supply unit is formed,
The jetty fin is formed so that the height from the outer periphery increases for a while as it reaches from the base end side to the opening end side,
The gist is that the end face of the jetty fin on the opening end side is formed in a plane so that the back side of the metal printed wiring board is surface-joined.

  The storage portion is integrally formed with an insertion groove extending from the base end side to the opening end side on the inner peripheral surface of the hollow interior.

  The jetty fin is formed thin and bent, and the tip side of the jetty fin is bent so that the height increases for a while from the base end side to the opening end side.

Moreover, as a method of forming the heat dissipation body of the bulb-type LED lighting lamp according to the present invention, a plurality of jetty ridges are formed on the outer periphery by extruding or drawing aluminum, and a cylindrical hollow portion is formed on the inner periphery. A cutting step of cutting the formed long radiator material into predetermined dimensions;
A fin forming step of forming a jetty fin by cutting or cutting the jetty of the radiator material from the base end side to the opening end side so that the height increases for a while;
The jetty fin end surface on the opening end side is formed by at least a plane processing for surface-bonding the back surface side of the metal printed wiring board, or a forming process step for processing into a shape for attaching a base.

As another method of forming the heat dissipation body of the bulb-type LED lighting lamp according to the present invention, a plurality of jetty ridges having a thickness that can be bent to the outer periphery by extrusion or drawing are formed, and the inner periphery A cutting step of cutting a long heat sink material formed with a cylindrical hollow portion into a predetermined dimension;
The jetty of the heat dissipating material is bent in a substantially circumferential direction as a bent line connecting the tip of the jetty on the base end side and the opening end side, and the height increases for a while as it reaches the base end side and the opening end side. A fin forming step to form jetty fins,
The jetty fin end surface on the opening end side is formed by at least a plane processing for surface-bonding the back surface side of the metal printed wiring board, or a forming process step for processing into a shape for attaching a base.

  According to the radiator of the bulb-type LED lighting lamp according to the present invention, the radiator for suppressing the temperature rise of the LED is formed into a hollow cylindrical shape by extruding or drawing aluminum, and a plurality of strips are formed on the outer periphery thereof. Since the jetty fins are formed, the thermal conductivity is as high as about 230 W / m · ° C, so it is possible to greatly increase the heat dissipation efficiency compared to conventional aluminum die-cast radiators. Become. Further, the metal printed wiring board in which the plurality of jetty fins are formed so that the height of the fins increases as they reach the opening end side close to the LED, and the plurality of LEDs are mounted on the surface side on the opening end side of the jetty fin As a result, the heat transfer resistance between the metal printed wiring board and the metal printed wiring board can be reduced. As a result, the heat generated from the LED can be quickly radiated by the jetty fins through the metal printed wiring board. Become. At this time, since the height is increased for a while as the jetty fin reaches the opening end side where the metal printed wiring board is joined, the heat generated from the LED is radiated with high efficiency from the opening end side having a large heat radiation area, Since the heat dissipation area is gradually reduced as the heat dissipation capacity is gradually reduced, efficient heat dissipation is possible according to the heat capacity required for heat dissipation. Furthermore, since the cylindrical storage portion is formed on the inner periphery, it is possible to store the power supply portion that generates the power supply of the LED, and the heat generated from the power supply portion can be dissipated by the radiator. As a result, the bulb-type LED lighting can be made compact.

  When the insertion groove from the base end side to the opening end side is integrally formed on the inner peripheral surface of the hollow interior, the storage section can be attached by inserting both sides of the printed circuit board constituting the power supply section that generates the power supply of the LED. It is possible to store the power supply unit in a compact manner.

  By forming the jetty fin thin and bending, and bending the tip side of the jetty fin so that the height increases for a while from the base end side to the opening end side, the surface area of the jetty fin can be increased. It becomes possible to improve the heat dissipation efficiency.

  Further, according to the method for forming a radiator according to the present invention, a long radiator material in which a plurality of jetties are formed on the outer periphery and a cylindrical hollow portion is formed on the inner periphery is extruded with aluminum. Or it can manufacture easily by drawing, and it becomes possible to obtain a heat radiator material easily by cut | disconnecting this elongate heat radiator material to a predetermined dimension. Furthermore, by cutting or cutting the jetty of the radiator material from the base end side to the opening end side so that the height increases for a while, the shape of the side surface substantially truncated cone that matches the shape of the bulb-type LED lighting lamp A heat radiator can be easily formed.

  According to another method of forming a radiator according to the present invention, a plurality of jetty jets having a thickness that can be bent to the outer periphery is formed by extruding or drawing aluminum, and the jetty is changed from the base end side to the opening end side. By bending so that the height increases for a while as it reaches, it is possible to easily form a heat sink having a substantially trapezoidal shape on the side that matches the shape of the bulb-type LED lighting. Thereby, it can contribute to reduction of manufacturing cost.

  The heat sink of the bulb-type LED lighting lamp according to the present invention is interposed between a base of a light bulb provided on the base end side and a printed wiring board on which a plurality of LEDs provided on the opening end side are mounted on the surface side. The This heat dissipation body is formed into a hollow cylindrical shape by extruding or drawing aluminum with good thermal conductivity, a plurality of jetty fins are formed on the outer periphery, and the LED power source is provided inside the hollow. A storage unit for storing the power supply unit to be generated is formed. The jetty fin is formed so that the height from the outer periphery gradually increases from the base end side to the opening end side, and the jetty fin end surface on the opening end side is formed of a metal printed wiring board. It is configured to be formed in a plane so that the back side is surface-bonded.

  Next, the heat radiator of the light bulb shaped LED lighting lamp according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view of a heat radiating body 1 of a bulb-type LED lighting lamp, and FIG. 2 is a perspective view of the heat radiating body 1 viewed from the base end side 1a. The heat radiating body 1 is formed in a hollow cylindrical shape using aluminum having good thermal conductivity as a material. A plurality of jetty fins 2 are formed on the outer periphery so as to project radially from the center of the heat dissipating body 1, and a housing 3 for housing a power source for generating the power of the LED is formed in the hollow interior. Has been. The plurality of jetty fins 2 are formed such that the height from the outer periphery increases for a while from the base end side 1a to the opening end side 1b. Furthermore, the end surface on the opening end side 1b of the jetty fin 2 is configured to be formed in a plane so that the back surface side of a metal printed wiring board described later is surface-bonded.

  Further, the interior of the storage portion 3 is a space, and as shown in FIGS. 1 and 2, protrusions 3a are formed on the left and right sides, and both ends of a metal printed wiring board (to be described later) are formed on the protrusions 3a. An insertion groove 3b for insertion is formed. Such an internal space of the storage part 3 is formed in the same shape from the base end side 1a to the opening end side 1b, and the base end side 1a and the opening end side 1b are openings.

  The heat radiator 1 described above is disposed in a bulb-type LED illumination lamp as shown in FIGS. A base 4 such as an E26 type, an E17 type, or an EZ11 type is attached to the base end side 1 a of the radiator 1. The base 4 may be attached by being fitted directly to the base end side 1a of the radiator 1, or may be attached via an insulator made of a resin having electrical insulation.

  On the other hand, a metal core printed circuit board 5 is attached to the opening end side 1b of the radiator 1. As shown in FIGS. 4 and 5, a plurality of LEDs 6 (light emitting diodes) are mounted on the upper surface of the metal core printed board 5. These LEDs 6 are electrically connected to a wiring pattern disposed on the metal core printed board 5. In FIG. 4, the LED chip is connected to the surface of the flat metal core printed circuit board 5, but a concave reflecting portion is formed on the surface of the metal core printed circuit board, and the LED chip is placed in the reflecting section. The light emitted from the LED 6 may be provided with directionality by mounting. Further, a bullet-shaped lens may be provided above each LED chip to diffuse the light from the LED 6 over a wide range.

  As described above, the opening end side 1b of the heat radiating body 1 is formed in a flat surface, and is attached to the back side of the metal core printed board 5 by surface bonding. As a fixing means between the radiator 1 and the metal core printed circuit board 5, for example, a double-sided adhesive heat radiating sheet made of a material having a high heat dissipation property is used as an opening end side 1b of the heat radiator 1 and a back surface side of the metal core printed circuit board 5. Alternatively, a screw hole may be formed on the end surface of the protruding portion 3a formed to protrude inside the storage portion 3, and the metal core printed board 5 may be fixed to the screw hole with a screw. For example, an appropriate mounting bracket may be used. Thus, by attaching the open end side 1b of the radiator 1 and the back side of the metal core printed circuit board 5 so as to be joined, heat generated from the LED 6 is efficiently applied to the heat radiator 1 via the metal core printed circuit board 5. Conducted.

  Electric power is supplied to the LED 6 from a power supply unit 7 disposed in the storage unit 3 of the radiator 1. The power supply unit 7 is composed of a circuit board provided with an AC / DC conversion circuit. The circuit board is electrically connected to the terminal part and the side surface of the bottom of the base 4 and, for example, AC 100V of commercial power is input. The And it is converted into direct current by an alternating current direct current conversion circuit, and is electrically connected to the positive and negative terminals of the LED 6 group.

  A substantially hemispherical translucent cap 8 is crowned on the opening end side 1b of the radiator 1. The cap 8 is formed of a translucent resin or glass having translucency, and diffuses light emitted from the LED 6 group to be emitted outward. As the translucent cap 8, different color temperatures and colors are used. Depending on the type of translucent cap 7, a plurality of types of light bulb-shaped LED illumination lamps can be obtained. Examples of the color temperature include daylight color, day white color, white color, warm white color, and light bulb color. Examples of the color temperature include red, blue, yellow, green, blue, pink, and the like.

  In the light bulb-type LED illuminating lamp configured as described above, first, when DC power is supplied from the power supply unit 7, the LED 6 emits radiated light. At this time, the heat generated from the LED 6 flows to the heat radiating body 1 through the metal core printed board 5 and is radiated from the heat radiating body 1 to the outside air. Since a plurality of jetty fins are formed on the outer periphery of the radiator 1, the cooling structure with a large heat radiation area can suppress the heat generation of the LED 6 and increase the light emission efficiency, thereby extending the life of the LED 6. Can do.

  Next, a method for forming the radiator 1 will be described with reference to FIGS. 6 and 7. The metal plate used as the material of the radiator 1 is preferably aluminum or aluminum alloy that has good thermal conductivity and can be extruded or drawn.

  FIG. 6 shows a process of forming the heat dissipating material 10 of the heat dissipating body 1 by extrusion. This extrusion process can generally employ a well-known extrusion process, and a detailed description thereof will be omitted. A die 11 is provided at the tip of an extruder not shown. The die 11 is provided with a flat-shaped extrusion hole 11a of the radiator 1 on the tip side. Then, as is well known, a heat sink of the radiator 1 is inserted from the extrusion hole 11a by inserting a billet made of an aluminum material from the hollow inside the heated die 11 and pressing the pellet with a predetermined pressure. The material 10 is extruded. The heat dissipating body material 10 is formed in a long shape according to the length of the billet.

  The heat dissipating member material 10 extruded from the die 11 is subjected to quenching processing and correction processing as necessary. Thereafter, the radiator material 10 is cut into dimensions necessary for the radiator 1. In addition, the cut | disconnected heat radiating material 10 is heat-processed as needed so that a dimension may not change with time. A plurality of ridges 10a are formed on the outer periphery of the heat dissipating member 10 thus extruded. The height of this jetty 10a is formed to the height of the opening end side 1b of the jetty fin 2 formed in the heat radiator 1. FIG. A cylindrical hollow portion is formed on the inner periphery of the heat dissipating member 10.

  In the fin forming step shown in FIG. 7, the radiator 1 shown in FIG. 1 is formed on the radiator material 10 cut to a predetermined size. In the fin forming step, heat is dissipated by cutting or cutting the portion of the two-dot chain line shown in FIG. 7 so that the height of the jetty 10a of the heat dissipating material 10 increases from the base end side to the opening end side for a while. The jetty fin 2 inclined with respect to the axial direction of the body 1 is formed.

  Thereafter, in the molding process, the heat dissipating material 10 is subjected to planar processing for joining the end surface of the jetty fin 2 on the opening end side 1b to the back side of the metal core printed wiring board 5, and the base end side 1a. The base 4 is processed into a shape for mounting. In addition, you may change the order of this shaping | molding process and the fin formation process mentioned above.

  FIG. 8 shows a modification of the heat radiating body 1 according to the present invention. In the outer periphery of the heat radiating body 2, double jetty fins 21 are formed with respect to the jetty fins 2 of the heat radiating body 1 described above. Also in this example, it can be formed by the same process as in the above-described embodiment, but the difference is that 16 jetty jetty is formed in the extrusion hole of the die used when extruding the heat dissipating material. It was formed.

  FIG. 9 shows another modification of the heat dissipating body according to the present invention, in which the planar shape of the jetty fins 21 formed on the outer periphery of the heat dissipating body 20 is different. That is, the jetty fin 21 is formed so as to gradually become thinner from the outer periphery of the storage portion 22 to the outside. Also in this example, it can be formed by the same process as the above-described embodiment, but the difference is the shape of the portion that forms the jetty of the extrusion hole of the die used when extruding the radiator material. Is different.

  FIG. 10 shows still another modification of the radiator according to the present invention, and the surface area of the jetty fin 31 formed on the outer periphery of the radiator 30 is greatly increased. That is, the jetty fins 31 formed on the outer periphery of the heat radiating body 30 are formed so as to be bent thin, and the tip side of the jetty fins 31 is set so that the height increases for a while from the base end side 30a to the opening end side 30b. The heat radiating body 30 is bent so as to wrap around its peripheral surface. At this time, the tip of the jetty fin 31 on the base end side 30 a is set to a dimension so as to contact the base end side 30 a of the adjacent jetty fin 31. The tip of the jetty fin 41 on the opening end side 30b is also bent slightly. In this manner, bending the tip of the jetty fin 41 from the base end side 30a to the opening end side 30b as a whole facilitates bending.

  Next, a method for forming the radiator 30 shown in FIG. 10 will be described. The metal plate used as the material of the radiator 30 is preferably aluminum or an aluminum alloy that has good thermal conductivity and can be extruded or drawn as in the above-described embodiments.

  First, the heat radiator material of the heat radiator 30 is formed by extrusion. As this extrusion process, a generally known extrusion process can be adopted, and, as in the above-described embodiment, a long radiator material is formed by a die in which a planar shape extrusion hole of the radiator 30 is formed on the tip side. Extrude. At this time, the point different from the embodiment shown in FIG. 6 is that the thickness of the jetty formed on the outer periphery is thinned to a bendable thickness.

  Thereafter, the long radiator material is cut into a predetermined size in a cutting process. Then, the jetty is bent and formed in the next fin forming step. At this time, the bent portion is bent with a straight line connecting the tip of the jetty on the base end side 30a and the opening end side 30b as a bend line. As a result, the side surface shape is formed in a substantially trapezoidal shape, similar to the radiator 1 whose outer shape is described above. In addition, as a jig for bending the jetty, the jetty may be bent individually, but it is bent so that the tip of the jetty is wound in the same direction by relatively rotating the radiator material or the jig. It may be formed. In addition, the bending direction of the tip of the jetty may be partially changed.

  Thereafter, the heat-dissipating material is subjected to a flattening process for joining the end surface of the jetty fin 31 on the opening end side 30b to the back surface side of the metal core printed wiring board 5 described above, and the base end side 30a is a base. 4 is processed into a shape to be attached. Also in this embodiment, the order of the forming process and the fin forming process described above may be changed.

  Although the present invention has been specifically described above based on the embodiments, it is needless to say that the present invention is not limited to the above embodiments and can be variously modified without departing from the gist thereof. In the above-described embodiment, the example in which the heat radiating material is formed by extrusion processing is shown, but it may be formed by drawing processing. When accuracy is required, drawing processing is desirable. As a modification, for example, the width of the jetty fins formed on the radiator and the width between them can be set as appropriate, and the width therebetween may be smaller than the width of the jetty fins. Further, the height and interval of the jetty fins are not uniform over the entire circumference, but the height, interval, and the like may be appropriately changed according to, for example, the heat distribution.

It is a perspective view which shows the heat radiator of the lightbulb-type LED lighting lamp concerning this invention. It is the top view which looked at the heat radiator shown in FIG. 1 from the opening end side. It is the perspective view which looked at the heat radiator shown in FIG. 1 from the base end side. FIG. 2 is a half cross-sectional view showing a state in which the radiator shown in FIG. 1 is disposed in a light bulb-shaped LED illumination lamp. It is a top view which shows the state which has arrange | positioned the heat radiator shown in FIG. 1 to the lightbulb-type LED illumination light. It is a perspective view which shows the extrusion process which forms the heat radiator material of the heat radiator concerning this invention. It is a side view which shows the fin formation process which cuts the jetty of the heat radiator raw material of the heat radiator concerning this invention. It is a perspective view which shows the modification of the heat radiator concerning this invention. It is a perspective view which shows the modification of the other heat radiator concerning this invention. It is a perspective view which shows the modification of the further another heat radiator concerning this invention.

DESCRIPTION OF SYMBOLS 1 Heat radiator 1a Base end side 1b Open end side 2 Jetty fin 3 Storage part 4 Base 5 Metal core printed board 6 LED (light emitting diode)
6a Radiating fin 10 Radiator material 10a Jetty 11 Dice

Claims (5)

A radiator that is interposed between a base of a light bulb provided on the base end side and a printed wiring board in which a plurality of LEDs provided on the opening end side are mounted on the surface side,
The heat radiator is formed into a hollow cylindrical shape by extruding or drawing aluminum with good thermal conductivity, a plurality of jetty fins are formed on the outer periphery, and the power source of the LED is generated inside the hollow A storage unit for storing the power supply unit is formed,
The jetty fin is formed so that the height from the outer periphery increases for a while as it reaches from the base end side to the opening end side,
The heat sink of a bulb-type LED lighting lamp, wherein the end face of the jetty fin on the opening end side is formed flat so that the back side of the metal printed wiring board is surface-joined.   The heat dissipation body for a light bulb-shaped LED illumination lamp according to claim 1, wherein the housing portion is integrally formed with an insertion groove extending from the base end side to the opening end side on the inner peripheral surface of the hollow interior.   The light bulb shaped LED according to claim 1, wherein the jetty fin is formed thin and bent so that a tip end side of the jetty fin is bent so that a height increases for a while from a base end side to the opening end side. Radiator for lighting. A cutting step of cutting a long radiator material in which a plurality of jetty piers are formed on the outer periphery by extrusion processing or drawing processing of aluminum and a cylindrical hollow portion is formed on the inner periphery to a predetermined dimension;
A fin forming step of forming a jetty fin by cutting or cutting the jetty of the radiator material from the base end side to the opening end side so that the height increases for a while;
A light bulb shape comprising at least a planar processing for joining the end surface of the jetty fin on the opening end side to the back surface side of the metal printed wiring board, or a forming processing step for processing into a shape for attaching a base A method for forming a radiator of an LED lighting. Plural piers with a thickness that can be bent to the outer periphery are formed by extruding or drawing aluminum, and a long radiator material with a cylindrical hollow part formed on the inner periphery is cut to a predetermined size Cutting step to
The jetty of the heat dissipating material is bent in a substantially circumferential direction as a bent line connecting the tip of the jetty on the base end side and the opening end side, and the height increases temporarily from the base end side to the opening end side. A fin forming step to form jetty fins,
A light bulb shape comprising at least a planar processing for joining the end surface of the jetty fin on the opening end side to the back surface side of the metal printed wiring board, or a forming processing step for processing into a shape for attaching a base A method for forming a radiator of an LED lighting.

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