JP2011070860A - Heat radiator of bulb type led illumination lamp, and method of forming the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat radiator of a bulb type light emitting diode illumination lamp which efficiently suppresses a temperature increase of an LED in spite of a simple structure, and reduces a manufacturing cost by forming the heat radiator, with a plurality of projection fins formed on an outer circumference, of a metal plate. <P>SOLUTION: The heat radiator 1 is interposed between a base 4 of a bulb arranged on a base end side 1a and a printed wiring board 5 arranged on an open end side 1b and having the LED 6 mounted thereon. The heat radiator 1 includes the plurality of projection fins 2 formed by meandering and bending the metal plate with good thermal conductivity on the outer circumference, and a housing part 3, which is arranged on an inner circumference and houses a power source part for generating power of the LED 6. The plurality of projection fins 2 formed by meandering and bending the metal plate 13 are formed to project so that a height from the housing part 3 increases gradually from the base end side 1a to the open end side 1b. An end surface of the open end side 1b of the projection fins 2 is formed in a plane surface so that a rear surface side of the metal printed wiring board 5 is surface-joined. <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, suppressing the temperature rise of LED is calculated | required. 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 the aluminum die cast is about 96 W / m · ° C., which is 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.

  Therefore, the object of the present invention is to form a metal radiator having a plurality of jetty fins formed on the outer periphery with a metal plate, so that the heat dissipation efficiency that can suppress the temperature rise of the LED is simple. Another object of the present invention is to provide a radiator for a light bulb-type light-emitting diode illuminating lamp that can be obtained and can reduce manufacturing costs.

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 dissipating body has a plurality of jetty fins formed by meandering and bending a metal plate having a good thermal conductivity on the outer periphery, and a cylindrical portion is provided on the inner periphery to store a power source for generating the LED power source. Shaped storage part is formed,
This jetty fin is formed so that the height from the storage portion 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.

  Each jetty fin formed on the outer periphery is bent and formed in a U-shape or a V-shape from the storage portion to form a space between the left and right plate surfaces.

  Each jetty fin has different heights on the opening end side according to the number of protrusions formed on the outer periphery.

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 concave grooves are formed corresponding to the tops of the plurality of jetty fins on a metal plate having thermal conductivity. A pre-bending step of bending the predetermined angle from the periphery of the central surface of the same shape as the cylindrical storage portion to form an overall shape in a substantially shade shape;
Between each of the concave grooves, a pressing step of pressing each pressing tool from the outer peripheral direction toward the center direction, and forming a plurality of ridge fins between each pressing tool,
A cutting step of flatly forming the opening end side of the plurality of jetty fins,
It is formed by meandering and bending a plurality of jetty fins with the outer surface of the concave groove at the top around the cylindrical storage portion.

  As the forming method, in the forming step, the central surface is placed in contact with the tip of the central rod having the same outer diameter as the storage portion, and then the metal plate is placed on the central rod with each pressing tool facing the central rod. It is formed by pressing until it comes into contact with the outer peripheral surface.

  Further, the pressing tool in the forming step is set to the width of the trunk portion of the storage portion between the adjacent jetty fins, and moves from the radial outer periphery perpendicular to the central rod, so that the metal plate is By pressing until it comes into contact with the outer peripheral surface, a meandering jetty fin is formed.

Further, the pressing tool in the forming step constitutes an arc-shaped pressing tool having an arc surface set to the width of the trunk portion of the storage portion between adjacent jetty fins, and the arc surface of the arc-shaped pressing tool And the distance between the outer peripheral surface of the central bar and the metal plate is set slightly larger than the plate thickness,
After placing the central surface of the metal plate in contact with the tip of the central rod, the central rod and the circular arc-shaped pressing tool are moved so that the circular arc-shaped pressing tool moves from the periphery of the central surface to the opening end side. The jetty fins meandering are formed by moving relatively in parallel with the central bar and pressing the metal plate so as to sequentially contact the outer peripheral surface of the central bar.

  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 by meandering a metal plate having a good thermal conductivity, and a plurality of jetty fins on the outer periphery. Therefore, a metal plate material having an optimum thermal conductivity can be selected and used as a heat radiator from various metal plate materials. 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. In addition, when an aluminum metal plate is used, the thermal conductivity of aluminum is about 230 W / m · ° C. Compared to the conventional aluminum die cast thermal conductivity of about 96 W / m · ° C. It is possible to dissipate heat more than twice as efficiently.

  If a space is formed between the left and right plate surfaces of each jetty fin that is bent and formed in a U-shape or V-shape from the storage portion, a heat radiation area is increased, so that efficient heat radiation is possible. Further, when the power supply unit is stored in the inner storage unit, heat generated from the power supply unit can be radiated to the space.

  The height of the open end side of each jetty fin that protrudes on the outer periphery becomes lower when the number of jetty fins is increased, and can be lowered when the number of jetty fins is reduced, so that the height varies depending on the number of jetty fins. Therefore, it is possible to form a heat radiating part suitable for the shape of the bulb-type LED lighting.

  Further, according to the method for forming a heat radiator according to the present invention, a plurality of jetty fins which are bent in a meandering manner as if the metal plate is folded by a pre-bending process and a forming process with respect to the metal plate having thermal conductivity. Since it can be formed, unlike the drawing process by press, the heat radiating body can be easily formed by a deformable bending process. In addition, when folded from a flat metal plate, the height of the jetty fin can be increased as it reaches the opening end side, and as a result, the side surface is substantially frustoconical heat dissipation that matches the shape of the bulb-type LED lighting lamp. The body can be easily formed.

  A jetty fin can be easily formed by using an arc-shaped pressing tool as a pressing tool in the forming process and pressing between the grooves formed in the pre-bending process while moving along an arc surface. When such an arc-type pressing tool is used, the jetty fins can be formed by relative movement in the axial direction, so that the configuration of the apparatus can be simplified and the manufacturing cost can be reduced.

  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 radiator is formed in a cylindrical shape so that a plurality of jetty fins formed by meandering and bending a metal plate having a good thermal conductivity are formed on the outer periphery, and a power supply unit for generating a power source for the LED is housed on the inner periphery. Is formed. The plurality of jetty fins in which the metal plate is meandered and bent are formed so that the height from the storage portion increases for a while from the base end side to the opening end side. And the end surface by the side of the opening end of a jetty fin is comprised so that it may form in a plane so that the back surface side of a metal printed wiring board may surface-join.

  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 radiator 1 of a bulb-type LED lighting, FIG. 2 is a plan view of the radiator 1 viewed from the open end side 1b, and FIG. 3 is a plan view of the radiator 1 viewed from the base end side 1a. It is a perspective view. The radiator 1 is selected from metal plates such as copper, iron, iron-nickel alloy, and aluminum having good thermal conductivity. The thickness of the metal plate is appropriately selected according to the heat dissipation capacity or the size of the LED lighting, but is preferably set to 0.1 mm to 3.0 mm.

  The heat dissipating body 1 is formed in a substantially bottomed cylindrical shape, and a plurality of jetty fins 2 in which a metal plate is meandered and bent are formed on the outer periphery. Further, a hollow cylindrical storage portion 3 is formed on the inner periphery in order to store a power supply portion for generating the power supply of the LED described later. The plurality of jetty fins 2 in which the metal plate is meandered and bent are formed so that the height from the storage portion 3 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, as shown in FIG. 2 and FIG. 3, an electric wire for supplying electric power to the power supply unit stored in the storage unit 3 is inserted into the bottom surface 1 a bottom surface of the storage unit 3 from the base 4 of the light bulb described later. An insertion hole 3a for mounting or a mounting hole 3b for arranging a power source is formed. Furthermore, a through-hole 3 c communicating with the outside is formed in the trunk portion of the storage portion 3 between the adjacent jetty fins 2. The through-hole 3c is provided for releasing the heat released from the power supply unit to the outside so as not to be trapped in the storage unit 3. The through-hole 3c is not provided when dust or water droplets enter from the outside and may adversely affect the power supply unit.

  Since each jetty fin 2 formed on the outer periphery of the radiator 1 is bent from the storage portion 3 into a U shape or a V shape, a space 2a is formed between the left and right plate surfaces. . Since a large surface area is obtained by forming the space 2a, the heat radiation efficiency can be increased.

  1 to 3 show an example in which eight jetty fins 2 are formed so as to protrude from the outer periphery of the radiator 1. The height from the storage portion 3 on the opening end side 1b of the jetty fin 2 varies depending on the number of the jetty fins 2 because the metal plate is meandered and bent. When the number is reduced, the height increases. Therefore, when setting the height of the jetty fin 2, it is preferable to make the number different. This is the case where the height of the jetty fins 2 formed on the entire outer periphery is the same, and this is not the case when the heights of some jetty fins 2 are made different. Further, the upper limit number of the jetty fins 2 is limited depending on the thickness of the metal plate to be used.

  The heat radiator 1 described above is disposed in a bulb-type LED illumination lamp as shown in FIGS. That is, a base 4 such as an E26 type, an E17 type, or an EZ11 type is attached to the base end side 1a 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. A plurality of LEDs 6 (light emitting diodes) are mounted on the upper surface of the metal core printed board 5 as shown in FIG. These LEDs 6 are electrically connected to a wiring pattern disposed on the metal core printed board 5. In FIG. 5, 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. It may be fixed by being interposed between them, or may be fixed using an appropriate mounting bracket. 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.

  The LED 6 is supplied with electric power from a power supply unit (not shown) disposed in the storage unit 3 of the radiator 1. The power supply unit 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 100 V of commercial power is input. . 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 light-transmitting cap 7 is crowned on the opening end side 1 b of the radiator 1. The cap 7 is formed of a translucent resin or glass having translucency, and diffuses light emitted from the LED 6 group and emits it outward. The translucent cap 7 has different color temperatures and colors. Depending on the type of translucent cap 7, a plurality of types of 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 bulb-type LED illuminating lamp configured as described above, first, when DC power is supplied from the power supply unit, 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 the radiator 1 has a metal plate meanderingly bent to form a plurality of jetty fins on the outer periphery, the cooling structure with a large heat radiation area can suppress the heat generation of the LED 6 and increase the light emission efficiency, and the lifetime Can be lengthened.

  Next, a method for forming the radiator 1 will be described with reference to FIGS. The metal plate used as the material of the radiator 1 is preferably copper or aluminum having good thermal conductivity and good plastic workability. In addition, iron-based metal plates such as stainless steel, copper alloys such as brass, and aluminum alloys such as duralumin may be used. The thickness of the metal plate is set in consideration of strength, durability, material, etc., and preferably 0.1 mm to 3.0 mm.

  FIG. 7 shows a mold 10 composed of an upper mold 11 and a lower mold 12 for performing a preliminary bending process in the process of forming the radiator 1. The upper mold 11 is formed in a substantially umbrella shape on the tip side, and a number of protrusions 11a corresponding to the number of jetty fins 2 of the heat radiating body 1 project from the peripheral surface. The ridge 11a is formed so as to increase in height from the outer edge of the flat front end surface 11b to the upper side in the figure. The height is 3 of the height of the jetty fin 2 even at the highest point. It is set to a height lower than a minute. Furthermore, the top of the protrusion 11 a is formed in a rectangular or substantially semicircular shape, and the thickness thereof is set to the width of the space 2 a formed between the plate surfaces of the jetty fins 2. Further, the flat front end surface 11 b is formed in a circular shape, and the diameter thereof is set to be substantially equal to the inner diameter of the storage portion 3 of the radiator 1. Incidentally, the angle of the protrusion 11a with respect to the tip surface 11b is preferably set to 30 to 45 degrees, and the angle of the peripheral surface between the protrusions 11a is preferably set to 40 to 55 degrees.

  On the other hand, the lower mold 12 is formed with a substantially mortar-shaped recess 12a so as to fit the upper mold 11, and a plurality of inner surfaces of the recess 12a are arranged at positions corresponding to the protrusions 11a of the upper mold 11. A groove 12b is formed. The width of the groove 12b is set to be slightly larger than the dimension obtained by adding the thickness of the protrusion 11a of the upper mold 11 to the thickness of two metal plates. The depth of the groove 12b is set to be the same as or smaller than the height of the protrusion 11a.

  The metal plate 13 is placed on the upper surface of the lower mold 12 thus configured. Thereafter, when the upper die 11 is lowered in the direction of the arrow, the metal plate 13 is pressed by the protrusion 11a of the upper die 11 and inserted into the groove 12b of the lower die 12. As a result, a plurality of concave grooves 13a are formed in the metal plate 13, and the space between the concave grooves 13a is curved in an arc shape toward the central direction. As a result, as shown in FIG. 8, the metal plate 13 is formed with a central surface 13b having the same shape as the housing 3 of the radiator 1 at the center, and is bent at an angle of 30 to 45 degrees from the periphery of the central surface 13b. Thus, the overall shape is formed in a substantially shade shape, and the preliminary bending process is completed.

  The metal plate 13 that has undergone the preliminary bending process moves to the next forming process. As shown in FIG. 9, the molding die 14 used in the molding process has a heat dissipating body 1 on the outer periphery of a cylindrical central bar 14 a whose outer diameter is the same as or slightly smaller than the inner diameter of the housing portion 3 of the heat dissipating body 1. A plurality of protrusions 14b having the same number as the number of the jetty fins 2 are formed to project radially. The protrusion 14b is formed so that the height from the outer periphery of the center bar 14a gradually increases from one end of the center bar 14a to the other end. Further, the pressing tool 15 that is fitted and pressed between the plurality of protrusions 14b is configured to move from the outside in the radial direction perpendicular to the center bar 14a toward the center bar 14a in the center direction.

  In the forming step, first, the central surface 13b of the metal plate 13 that has undergone the pre-bending step is brought into contact with the end surface of the central rod 14a of the forming die 14, and the concave groove 13a of the metal plate 13 is formed on the forming die 14. It is made to correspond to the some protrusion 14b. Thereafter, as indicated by the arrows shown in FIG. 9, the pressing tool 15 is pressed toward the central direction of the central bar 14a with the plurality of protrusions 14b. And when the front-end | tip part of the press tool 15 arrives at the outer periphery of the center stick | rod 14a in the state which interposed the metal plate 13, a press is stopped. Thereafter, the pressing tool 15 is returned and separated, and the metal plate 13 is pulled out from the central bar 14a of the mold 14 so that the metal plate 13 is an element of a heat radiator in which eight jetty fins 2 project from the outer periphery. The body is formed.

  Since the open end of the heat dissipating element body that has undergone the forming step is uneven, the open end side of the plurality of jetty fins 2 is formed flat in the next cutting step. This cutting process is performed by a known processing means using an appropriate tool such as a cutter, a lathe, or a milling cutter. In addition, it is important to form the opening end side of the jetty fin 2 relatively smoothly because the metal core printed board 5 is surface-bonded. Then, the insertion hole 3a and the attachment hole 3b are drilled in the bottom face of the base end side 1a of the storage part 3, and the heat radiator 1 is completed. Further, the heat radiating body 1 is subjected to surface treatment for rust prevention and touch prevention such as plating treatment, alumite treatment, or painting as necessary.

  FIG. 10 is a perspective view showing a modification of the pressing tool in the forming process. The pressing tool shown in FIG. 10 is an arc-shaped pressing tool 16 configured in a roller shape. The arc-shaped pressing tool 16 is a rotatable disk-shaped roller, and the circumferential surface is formed on the arc surface 16a. Furthermore, the width of the circular arc surface 16a is set to the width of the trunk portion of the storage portion 3 between the jetty fins 2 adjacent to the radiator 1. This arc-type pressing tool 16 is configured to move in parallel with the axis of the center rod 17 of the forming die. Further, the center rod 17 of the molding die used in the molding process is formed in a cylindrical shape whose diameter is set to the inner diameter of the storage portion 3.

  And while making the center surface 13b of the metal plate 13 which passed the preliminary | backup bending process mentioned above correspond to the end surface of the center bar | burr 17, each circular arc type press tool 16 is between each recessed groove 13a of the metal plate 13. Set to position. At this time, the arc-shaped pressing tool 16 stands by at a spaced position outside the end face of the central bar 17 in order to facilitate the setting of the metal plate 13. Thereafter, the arcuate surface 16 a of the arc-shaped pressing tool 16 is pressed against the central surface 13 b side of the metal plate 13, and the arc-shaped pressing tool 16 is moved in parallel with the axis of the central bar 17. As a result, the space between the plurality of concave grooves 13a is sequentially pressed against the metal plate 13 in the direction of the center rod 14a, and the metal plate 13 is formed with a radiator body in which eight jetty fins 2 project from the outer periphery. Is done. Thereafter, the element body of the heat dissipator forms the open end side of the plurality of jetty fins 2 flat in the cutting step described above.

  The center bar 17 shown in FIG. 10 is formed in a columnar shape, and a plurality of protrusions 14b are not formed on the outer periphery like the center bar 14a shown in FIG. Even in the case of such a center rod 17, when the arc-shaped pressing tool 16 is moved, the concave grooves 13a of the metal plate 13 are sandwiched between the adjacent arc-shaped pressing tools 16, so the jetty fin 2 Is formed. In addition, when forming the jetty fin 2 accurately and beautifully, it is desirable to use the center rod 14a shown in FIG. 9 in which a plurality of protrusions 14b are formed to protrude on the outer periphery. Further, the arc-shaped pressing tool 16 may not be a disk-shaped roller, but may be a fixing member having an arc surface. In this case, the arc surface is slid between the concave grooves 13 a of the metal plate 13. Mold while moving.

  11 to 13 show modifications of the heat radiator. The radiator 20 shown in FIG. 11 is an example in which each jetty fin 21 formed on the outer periphery is bent from a storage portion into a V shape, and a V-shaped space is formed between left and right plate surfaces. In order to form such a V-shaped jetty fin 21, the pressing tool 15 shown in FIG. 9 may be configured so that the width gradually decreases toward the tip.

The radiator 22 shown in FIG. 12 forms each jetty fin 23 formed in the outer periphery in a rectangular shape,
Is bent from the storage portion into a V shape, and the width of the space 23a formed between the left and right plate surfaces is increased. In this example, the rectangular jetty fins 23 are formed by increasing the width of the plurality of protrusions 14b formed to protrude from the outer periphery of the central bar 14a shown in FIG. 9 and decreasing the width of the pressing tool 15. can do.

  The heat radiator 24 shown in FIG. 13 shows an example in which a large number of jetty fins 25 are formed. Thus, when the number of jetty fins 25 is increased, the height of the jetty fins on the opening side is inevitably lowered because the metal plate is meandered and bent to form the jetty fins.

  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. 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 between them 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 1b. It is the perspective view which looked at the heat radiator shown in FIG. 1 from the base end side. It is a perspective view which shows the state which has arrange | positioned the heat radiator shown in FIG. 1 to the lightbulb-shaped LED illumination light. 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 metal core printed circuit board to the heat radiator shown in FIG. It is explanatory drawing which shows the metal mold | die for the pre-bending process which forms the heat radiator concerning this invention. It is a top view which shows the metal plate formed of the pre-bending process. It is explanatory drawing which shows the metal mold | die for the shaping | molding process which forms a heat radiator. It is explanatory drawing which shows the other example of the metal mold | die for a formation process which forms a heat radiator. It is a perspective view which shows the Example which formed the jetty fin of the heat sink in V shape. It is a perspective view which shows the Example which formed the jetty fin of the heat radiator in the rectangular shape. It is a perspective view which shows the Example which formed many jetty fins of a heat radiator.

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 Preliminary bending mold 11 Upper mold 12 Lower mold 12a Groove 13 Metal plate 13a Concave groove 14 Mold 14a Center rod 15 Press tool

Claims (7)

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 dissipating body is formed with a plurality of jetty fins formed by meandering and bending a metal plate having a good thermal conductivity on the outer periphery, and a cylindrical so as to accommodate a power supply unit for generating the power of the LED on the inner periphery. Shaped storage part is formed,
The jetty fin is formed so that the height from the storage portion 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 sink of the light bulb shaped LED lighting lamp according to claim 1, wherein each jetty fin is bent and formed in a U shape or a V shape from the storage portion, and a space is formed between the left and right plate surfaces.   The heat sink of the bulb-type LED lighting lamp according to claim 1 or 2, wherein each jetty fin has a different height on the opening end side according to the number of protrusions formed on the outer periphery. The metal plate having thermal conductivity is formed with a plurality of concave grooves corresponding to the tops of the plurality of jetty fins, and is bent at a predetermined angle from the periphery of the central surface having the same shape as the cylindrical storage portion. A pre-bending step for forming the shape into a substantially shade shape;
Between each of the concave grooves, a pressing step of pressing each pressing tool from the outer peripheral direction toward the center direction, and forming a plurality of ridge fins between each pressing tool,
A cutting step of flatly forming the opening end side of the plurality of jetty fins,
A method of forming a radiator for a bulb-type LED lighting lamp, characterized in that a plurality of jetty fins having an outer surface of the concave groove as a top meander and bend around the cylindrical storage portion.   In the forming process, the central surface is placed in contact with the tip of the central rod having the same outer diameter as the storage portion, and then the metal plate is brought into contact with the outer peripheral surface of the central rod with each pressing tool facing the central rod. The formation method of the heat radiator of the lightbulb-type LED illumination light of Claim 4 pressed until it contacts.   The pressing tool in the forming step is set to the width of the trunk portion of the storage portion between the adjacent jetty fins, and the metal plate moves from the outer periphery in the radial direction perpendicular to the central rod, and the metal plate is the outer peripheral surface of the central rod. The method of forming a radiator for a light bulb shaped LED lighting device according to claim 4, wherein the heat sink is pressed until it comes into contact. The pressing tool in the forming step constitutes an arc-shaped pressing tool having an arc surface set to the width of the trunk portion of the storage portion between adjacent jetty fins, and the arc surface of the arc-shaped pressing tool and the above-mentioned The distance between the central rod and the outer peripheral surface is set to be slightly larger than the thickness of the metal plate,
After placing the central surface of the metal plate in contact with the tip of the central rod, the central rod and the circular arc-shaped pressing tool are moved so that the circular arc-shaped pressing tool moves from the periphery of the central surface to the opening end side. The method of forming a radiator for a bulb-shaped LED lighting device according to claim 4, wherein the metal plate is moved so as to be parallel to the central bar, and the metal plate is pressed so as to sequentially contact the outer peripheral surface of the central bar.

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