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

Heat radiator of bulb type led illumination lamp, and method of forming the same Download PDF

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JP2011070860A
JP2011070860A JP2009219821A JP2009219821A JP2011070860A JP 2011070860 A JP2011070860 A JP 2011070860A JP 2009219821 A JP2009219821 A JP 2009219821A JP 2009219821 A JP2009219821 A JP 2009219821A JP 2011070860 A JP2011070860 A JP 2011070860A
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jetty
metal plate
fins
forming
radiator
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Hideyuki Miyahara
英行 宮原
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Nakamura Manufacturing Co Ltd
Nakamura Seisakusho KK
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Nakamura Manufacturing Co Ltd
Nakamura Seisakusho KK
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21KNON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/20Light sources comprising attachment means
    • F21K9/23Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21VFUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50Cooling arrangements
    • F21V29/70Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/83Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks the elements having apertures, ducts or channels, e.g. heat radiation holes
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00Light-generating elements of semiconductor light sources
    • F21Y2115/10Light-emitting diodes [LED]

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

本発明は、電球形LED照明灯の放熱体に関し、詳しくは、LEDの温度上昇を抑制するための放熱体に関する。   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.

近年、環境問題、特に二酸化炭素の削減において、低消費電力である発光ダイオード(以下、LEDと略記する)を用いた照明灯の需要が高まっている。LEDは、温度が上昇するに従い、光出力の低下とともに寿命も短くなることが知られている。このため、LEDを光源とするランプでは、LEDの温度上昇を抑制することが求められている。従来、こうした要請に配慮して、LEDから伝わる熱を外部に放出するための放熱部を備え、この放熱部を外部に露出させたLED電球が知られている   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.

例えば、特開2001−243809号公報(特許文献1)に記載のLED電球は、略球体の内部に設けた金属基板の外面にはLEDが実装され、略球体の一端には口金が設けられ、他端は開口部に向けてラッパ状をなす金属製放熱部と、前記開口部に取付けられた透光性カバーが設けられている。また、特開2006−313717号公報(特許文献2)に記載の電球形LEDランプは、外部に露出する周部を有する金属製の外郭部材(放熱部)の光源取付け部に熱伝導するようにLEDが実装されたLED基板を取付けたものであり、LED基板の熱を金属製外郭部材の光源取付け部を介して周部に伝導させ、包熱効果を高めることによってLED基板の温度上昇を抑制することが記載されている。   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.

これらの特許文献1および2に記載の放熱部は、その形状がラッパ状に形成されていることから、放熱面積が小さいために、LEDから伝わる熱を外部に放出するための放熱効率が小さくなり、特に大きな電流を流すことが必要な高輝度LEDにあっては、高温の発熱を伴うために温度上昇を抑制することができないことがある。   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.

そのために、外面に放熱フィンを形成した放熱部が提案されている。例えば、特開2009−170114号公報(特許文献3)の段落0028には、中空内部に青色LED素子を点灯する点灯回路が内蔵され、側面部には複数の放熱フィンが設けられた放熱部が記載され、LEDモジュールの青色LED素子の熱が放熱板を介して複数の放熱フィンに伝熱され、複数の放熱フィンから放熱することが記載されている。   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.

また、外面に放熱フィンを形成した放熱部としては、特開2006−40727号公報(特許文献4)の段落0024、0025には、LEDを実装した金属プリント配線板を収納する例えばアルミニウムのような金属からなる器体の頭部の外周面には、それぞれ上下に長い多数の放熱フィンを周方向に沿って等間隔に突設することが記載されている。   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.

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

上述した特許文献3および特許文献4に示される放熱部や器体は、外周面に放熱フィンを形成することによって放熱面積が大幅に増加することから、放熱効率が高くなり、高輝度LEDであっても温度上昇を抑制することが可能となる。しかしながら、放熱部および放熱フィンについて言及した記載がないが、図示の構造および形状から、表面に多数のフィンを備えた中空のすり鉢形状の部品は、アルミダイキャストによって形成することが推察される。   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.

ところが、アルミダイキャストは、良く知られている一般的な形成手段であるが、アルミダイキャストを放熱部材として使用することは必ずしも好ましくない。すなわち、アルミダイキャストは、アルミニウム素材の他に亜鉛、錫、マンガン等の数種の金属を加えている。このため、アルミダイキャストの熱伝導率は、約96W/m・℃と、アルミニウムの金属板素材の熱伝導率約230W/m・℃よりも低い値を示している。   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.

因みに、公設の工業技術センターが行ったLED電球のアルミダイキャスト製アルミ放熱ボディの研究の結果によると、高輝度LED等の一部のLED電球では、放熱が追いつかず、LED 寿命が低下することが懸念されため、ボディをより大型化しフィン枚数を増やすことで放熱面積を増加させる対策を講じたと報じている。このように、アルミダイキャスト製の放熱部を使用することにより、重量及び体積が大きくなり、光源をLEDとして小型化しても、放熱構造が大きくなることから、小型化できない問題がある。   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.

また、アルミダイキャストにより放熱部を製造する場合には、アルミニウム合金を高温で溶解し、ダイキャスト金型に注入成形し、その後、不要部分の除去や表面仕上げを行う等の多くの工程を必要とし、製造コストが高くなる問題もある。   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.

そこで、本発明の課題は、外周に複数条の突堤フィンが形成された金属放熱体を金属板により形成することによって、簡易な構成でありながらLEDの温度上昇を抑制することができる放熱効率が得られ、しかも製造コストを低減することができる電球形発光ダイオード照明灯の放熱体を提供することにある。   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.

上記の課題を解決するために、本発明にかかる電球形LED照明灯の放熱体は、基端側に設けられる電球の口金と、開口端側に設けられる複数個のLEDが表面側に実装されたプリント配線板との間に介在される放熱体であって、
上記放熱体は、熱伝導率が良好な金属板を蛇行屈曲させた複数条の突堤フィンが外周に形成されるとともに、内周には上記LEDの電源を生成する電源部を収納するように円筒状の収納部が形成され、
この突堤フィンは、上記収納部からの高さが上記基端側から上記開口端側に至るに従って暫時大きくなるように突出形成され、
上記開口端側の上記突堤フィン端面は、金属プリント配線板の裏面側が面接合するように平面に形成されたことを要旨としている。
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.

外周に形成される各突堤フィンは、収納部からU字状やV字状に屈曲形成され、左右の板面の間に空間を形成している。   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.

各突堤フィンは、外周に突出形成する個数に応じて開口端側の高さを異ならせている。   Each jetty fin has different heights on the opening end side according to the number of protrusions formed on the outer periphery.

また、本発明にかかる電球形LED照明灯の放熱体を形成する方法としては、熱伝導性を有する金属板に対し、複数条の突堤フィンの頂部に対応させて複数の凹溝を形成すると共に、円筒状の収納部と同じ形状の中央面の周囲から所定角度屈曲して全体形状を略笠状に形成する予備曲げ工程と、
各々の上記凹溝の間に対して、各々押圧工具を外周方向から中心方向に向けて押圧して、各押圧工具の間に各々複数条の突堤フィンを形成する成形工程と、
複数条の上記突堤フィンの開口端側を平坦に形成する切断工程とを有し、
上記円筒状の収納部の周囲に上記凹溝の外面を頂部とした複数条の突堤フィンを蛇行させて屈曲形成することにより形成される。
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.

上記形成方法として、成形工程において、収納部と同じ外径を有する中央棒の先端に中央面を当接載置し、その後、各押圧工具を上記中央棒に向けて上記金属板が上記中央棒の外周面に当接するまで押圧することにより形成される。   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.

また、成形工程における押圧工具は、先端が隣接する突堤フィンの間の収納部の胴部の幅に設定され、上記中央棒と直角な放射方向外周から移動して上記金属板が上記中央棒の外周面に当接するまで押圧することにより、蛇行させた突堤フィンが形成される。   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.

さらに、成形工程における押圧工具は、周面が隣接する突堤フィンの間の収納部の胴部の幅に設定された円弧面を有する円弧型押圧工具を構成し、この円弧型押圧工具の円弧面と上記中央棒の外周面との間隔を金属板の板厚よりも僅かに大きく設定して配設され、
中央棒の先端に金属板の中央面を当接載置した後、上記円弧型押圧工具が上記中央面の周囲から開口端側に移動するように、上記中央棒と上記円弧型押圧工具とを上記中央棒と平行に相対的に移動し、金属板が中央棒の外周面に順次当接するよう押圧することにより蛇行させた突堤フィンが形成される。
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.

本発明にかかる電球形LED照明灯の放熱体によれば、LEDの温度上昇を抑制するための放熱体が、熱伝導率が良好な金属板を蛇行屈曲させて、外周に複数条の突堤フィンを形成しているので、放熱体として多種の金属板素材の中から最適な熱伝導率を有する金属板素材を選択して使用することができる。また、複数条の突堤フィンが、LEDに近い開口端側に至るに従ってフィンの高さを大きく形成し、開口端側の突堤フィン端面に複数個のLEDが表面側に実装された金属プリント配線板を面接合させるので、金属プリント配線板との間の熱伝達抵抗を小さくすることができ、この結果、LEDから発する熱が金属プリント配線板を介して速やかに突堤フィンにより放熱させることが可能となる。このとき、突堤フィンが金属プリント配線板を接合した開口端側に至るに従って暫時高さを大きくしているので、LEDから発する熱が、大きな放熱面積を有する開口端側から高効率で放熱され、次第に放熱容量が小さくなるに従って順次小さな放熱面積としているので、放熱に必要な熱容量に応じて効率的な放熱が可能となる。さらに、内周に円筒状の収納部が形成されているので、上記LEDの電源を生成する電源部を収納することができ、この電源部から発する熱も放熱体によって放熱することが可能になり、この結果、電球形LED照明灯をコンパクトにすることができる。また、因みに、アルミニウムの金属板を使用した場合には、アルミニウムの熱伝導率が約230W/m・℃であることから、従来のアルミダイキャストの熱伝導率約96W/m・℃と比較し、約2倍以上も効率よく放熱することが可能となる。   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.

収納部からU字状やV字状に屈曲形成された各突堤フィンの左右の板面の間に空間を形成すると、放熱面積が大きくなるので効率的な放熱が可能となる。また、内周の収納部に電源部を収納したとき、電源部から発する熱が空間に放熱することが可能となる。   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.

外周に突出形成する各突堤フィンの開口端側の高さは、突堤フィンの個数を多くすると低くなり、個数を少なくすると低くすることができるので、突堤フィンの個数に応じて高さを異ならせることができ、電球形LED照明灯の形状に適合した放熱部を形成することが可能となる。   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.

また、本発明による放熱体を形成方法によれば、熱伝導性を有する金属板に対し、予備曲げ工程と成形工程により、金属板をあたかも折り畳むようにして蛇行屈曲させた複数条の突堤フィンを形成することができるので、プレスによる絞り加工とは異なり、変形的な折り曲げ加工により放熱体を容易に形成することができる。また、平坦な金属板から折り畳み形成すると、突堤フィンの高さを開口端側に至るに従って高くすることが形成でき、この結果、電球形LED照明灯の形状に合致した側面略円錐台状の放熱体を容易に形成することが可能となる。   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.

成形工程における押圧工具として、円弧型押圧工具を用い、予備曲げ工程において形成された各々の凹溝の間を円弧面によって移動しながら押圧することにより、容易に突堤フィンを形成することができる。このような円弧型押圧工具を用いると、軸方向への相対的移動で突堤フィンを形成できるので、装置の構成を簡易にすることが可能となり、製造コストの低減に寄与できる。   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.

本発明による電球形LED照明灯の放熱体は、基端側に設けられる電球の口金と、開口端側に設けられる複数個のLEDが表面側に実装されたプリント配線板との間に介在される。この放熱体は、熱伝導率が良好な金属板を蛇行屈曲させた複数条の突堤フィンが外周に形成されるとともに、内周にはLEDの電源を生成する電源部を収納するように円筒状の収納部が形成される。金属板を蛇行屈曲させた複数条の突堤フィンは、収納部からの高さが基端側から開口端側に至るに従って暫時大きくなるように突出形成される。そして、突堤フィンの開口端側の端面は、金属プリント配線板の裏面側が面接合するように平面に形成されるように構成される。   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.

次に、図面を参照して本発明にかかる電球形LED照明灯の放熱体について詳細に説明する。   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.

図1は、電球形LED照明灯の放熱体1の斜視図、図2は、放熱体1を開口端側1bから見た平面図、図3は、放熱体1を基端側1aから見た斜視図である。放熱体1は、熱伝導性の良い銅、鉄、鉄−ニッケル合金、アルミニウムなどの金属板から選択される。金属板の板厚保は、放熱容量或いはLED照明灯の大きさに応じて適宜選択されるが、好ましくは、0.1mm乃至3.0mmに設定される。   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.

放熱体1は、略有底筒状に形成され、外周には金属板を蛇行屈曲させた複数条の突堤フィン2が突出形成されている。さらに、内周には、後述するLEDの電源を生成する電源部を収納するために、中空円筒状の収納部3が形成されている。そして、金属板を蛇行屈曲させた複数条の突堤フィン2は、収納部3からの高さが基端側1aから開口端側1bに至るに従って暫時大きくなるように突出形成されている。さらに、突堤フィン2の開口端側1bの端面は、後述する金属プリント配線板の裏面側が面接合するように平面に形成されるように構成されている。   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.

また、収納部3の基端側1a底面には、図2及び図3に示すように、後述する電球の口金4から収納部3に収納される電源部に電力を供給するための電線を挿通する挿通孔3a、或いは、電源部を配設するための取付孔3bが穿設されている。さらに、隣接する突堤フィン2間の収納部3の胴部には、外部に連通する透孔3cが形成されている。この透孔3cは、電源部から放出される熱が収納部3内に籠もらないように外部に放出するために設けられている。なお、透孔3cは、外部から埃や水滴が侵入して、電源部に悪影響を及ぶす可能性がある場合には設けられない。   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.

放熱体1の外周に形成される各突堤フィン2は、収納部3からU字状やV字状に屈曲形成されていることから、左右の板面の間には空間2aが形成されている。この空間2aを形成することによって大きな表面積が得られることから、放熱効率を高くすることができる。   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.

図1乃至図3には、放熱体1の外周に8個の突堤フィン2を突出形成した例を示している。突堤フィン2の開口端側1bにおける収納部3からの高さは、金属板を蛇行屈曲させることから、突堤フィン2の個数に応じて異なり、個数を多くした場合には高さが低くなり、個数を少なくした場合には高さが高くなる。従って、突堤フィン2の高さを設定する場合は、個数を異ならせることが好ましい。これは、外周全体に形成する突堤フィン2の高さを同じにした場合であって、一部の突堤フィン2の高さを異ならせた場合はこの限りではない。また、使用する金属板の板厚によっては突堤フィン2の上限の個数が制限される。   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.

上述した放熱体1は、図4乃至図6に示すように、電球形LED照明灯に配設される。すなわち、放熱体1の基端側1aには、E26型、E17型、EZ11型等の口金4が取り付けられる。この口金4は、放熱体1の基端側1aに直接嵌合して取り付けても、或いは、電気的絶縁性を有する樹脂からなるインシュレータを介して取り付けても良い。   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.

一方、放熱体1の開口端側1bには、金属コアプリント基板5が取り付けられる。この金属コアプリント基板5の上面には、図5に示すように、複数個のLED6(発光ダイオード)が実装されている。これらのLED6は、金属コアプリント基板5に配設した配線パターンに電気的に接続されている。なお、図5においては、平坦な金属コアプリント基板5の表面にLEDチップを接続しているが、金属コアプリント基板の表面に凹面状の反射部を形成して、その反射部内にLEDチップを実装して、LED6から発する光に方向性を持たせても良い。また、各LEDチップの上方に弾丸形のレンズを配設して、LED6の光を広い範囲に拡散させるようにしても良い。   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.

前述したように、放熱体1の開口端側1bは平面に形成されていて、金属コアプリント基板5の裏面側と面接合させて取り付けられる。放熱体1と金属コアプリント基板5との固定手段としては、例えば、高い放熱性を有する素材でできた両面粘着放熱シートを放熱体1の開口端側1bと金属コアプリント基板5の裏面側との間に介在させて固定しても良く、或いは、適宜の取付金具を用いて固定しても良い。このように、放熱体1の開口端側1bと金属コアプリント基板5の裏面側と面接合させて取り付けることにより、LED6から発する熱が金属コアプリント基板5を介して放熱体1に効率的に伝導される。   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.

上記LED6には、放熱体1の収納部3に配設した電源部(図示しない)から電力が供給される。電源部は、交流直流変換回路が設けられた回路基板からなり、この回路基板には、口金4の底部の端子部および側面に電気的に接続されて、例えば商用電源の交流100Vが入力される。そして、交流直流変換回路により直流に変換され、LED6群の正負の端子に電気的に接続される。   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.

そして、放熱体1の開口端側1bには、略半球状の透光性キャップ7が被冠される。キャップ7は、透光性を有する半透明の樹脂またはガラスによって形成されていて、LED6群から発する光を拡散させて外方に放出させる。透光性キャップ7としては、異なる色温度および色のものが用いられ、透光性キャップ7の種類によって複数種類の電球形LED照明灯が得られる。なお、色温度としては、例えば昼光色、昼白色、白色、温白色、電球色があり、色としては、例えば赤、青、黄色、緑、青、ピンク等がある。   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.

このように構成した電球形LED照明灯において、まず、電源部から直流電源が供給されるとLED6が放射光を放射する。このときLED6から発生した熱は、金属コアプリント基板5を介して放熱体1に流れ、放熱体1から外部の空気に放熱される。放熱体1は金属板を蛇行屈曲させて外周に複数条の突堤フィンを形成しているので、大きな放熱面積による冷却構造により、LED6の発熱を抑制して発光効率を高くすることができ、寿命を長くすることができる。   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.

次に、図7乃至図9を参照しながら、放熱体1の形成方法について説明する。放熱体1の素材となる金属板は、熱伝導性が良く、しかも塑性加工性が良好な銅やアルミニウムが好ましい。その他、ステンレス等の鉄系金属板や真鍮等の銅合金、ジュラルミン等のアルミニウム合金を使用しても良い。また、金属板の板厚は、強度、耐久性、或いは材質等を考慮して設定されるが、好ましくは0.1mm乃至3.0mmが適当である。   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.

図7は、放熱体1を形成する工程において、予備曲げ工程を行うための上型11と下型12からなる金型10を示している。上型11は、先端側が略傘状に形成され、その周面には、放熱体1の突堤フィン2の個数に応じた数の突条11aが突出形成されている。この突条11aは、平坦な先端面11bの外縁から図示上方に至るに従って、高さが高くなるように形成されているが、その高さは、最も高い個所でも突堤フィン2の高さの3分の1よりも低い高さに設定されている。さらに、突条11aは、頂部が矩形もしくは略半円状に形成され、その厚さは、突堤フィン2の板面の間に形成される空間2aの幅に設定されている。また、平坦な先端面11bは円形に形成され、その直径は、放熱体1の収納部3の内径にほぼ等しく設定されている。因みに、先端面11bに対する突条11aの角度は、30度乃至45度に設定することが好ましく、各突条11aの間の周面の角度は、40度乃至55度に設定することが好ましい。   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.

一方、下型12は、上型11を嵌合するように、略すり鉢状の凹所12aが形成され、凹所12aな内面には、上型11の突条11aに対応する位置に複数の溝12bが形成されている。この溝12bの幅は、上型11の突条11aの厚さに金属板の板厚2枚分を加えた寸法よりやや大きくなるように設定されている。また、溝12bの深さは、突条11aの高さ寸法と同じか、もしくは小さい寸法に設定されている。   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.

このように構成された下型12の上面に金属板13を載置する。その後、上型11を矢示の方向に下降すると、金属板13が上型11の突条11aによって押圧されると共に、下型12の溝12b内に挿入する。これにより、金属板13に複数の凹溝13aが形成され、凹溝13aの間が中心方向に向けた円弧状に湾曲される。この結果、図8に示すように、金属板13は中央に放熱体1の収納部3と同じ形状の中央面13bが形成され、この中央面13bの周囲から30度乃至45度の角度に屈曲して全体形状を略笠状に形成され、予備曲げ工程が終了する。   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.

予備曲げ工程を経た金属板13は、次の成形工程に移行する。成形工程に使用する成形型14は、図9に示すように、外径寸法を放熱体1の収納部3の内径と同じかやや小さくした円柱状の中央棒14aの外周には、放熱体1の突堤フィン2の個数と同じ数の複数の突部14bが放射状に突出形成されている。突部14bは、中央棒14aの一端から他端に至るに従って中央棒14aの外周からの高さが次第に高くなるように形成されている。また、複数の突部14bの間に嵌合押圧する押圧工具15が、中央棒14aと直角な放射方向の外方から中央棒14aに中心方向に向けて移動するように構成されている。   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.

成形工程においては、まず、予備曲げ工程を経た金属板13の中央面13bが成形型14の中央棒14aの端面に一致するように当接すると共に、金属板13の凹溝13aを成形型14の複数の突部14bに一致させる。その後、図9に示す矢示のように、押圧工具15を複数の突部14bを中央棒14aの中心方向に向けて押圧する。そして、押圧具15の先端部が金属板13を介在した状態で中央棒14aの外周に到達した時に押圧を停止する。その後、押圧工具15を復帰させて離間し、金属板13を成形型14の中央棒14aから抜くことにより、金属板13は、外周に8個の突堤フィン2が突出形成された放熱体の素体が形成される。   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.

成形工程を経た放熱体の素体は、開口端が凹凸状になっているので、次の切断工程において、複数条の突堤フィン2の開口端側を平坦に形成する。この切断工程は、カッター、旋盤、フライスなど適宜の工具を使用し、周知の加工手段によって加工される。なお、突堤フィン2の開口端側は、金属コアプリント基板5を面接合することから、比較的平滑に形成することが肝要である。その後、収納部3の基端側1a底面に、挿通孔3aや取付孔3bが穿設され、放熱体1が完成する。また、放熱体1には、必要に応じてメッキ処理、アルマイト処理、或いは、塗装等の防錆、防触のための表面処理が施される。   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.

図10は、成形工程における押圧工具の変形例を示す斜視図である。図10に示す押圧工具は、ローラ状に構成された円弧型押圧工具16である。この円弧型押圧工具16は、回転可能な円盤状のローラであり、周面が円弧面16aに形成されている。さらに、円弧面16aの幅は、放熱体1の隣接する突堤フィン2の間の収納部3の胴部の幅に設定されている。この円弧型押圧工具16は、成形型の中央棒17の軸芯と平行に移動するように構成されている。また、成形工程において使用する成形型の中央棒17は、直径を収納部3の内径に設定した円柱状に形成されている。   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.

そして、前述した予備曲げ工程を経た金属板13の中央面13bが中央棒17の端面に一致するように当接させるとともに、各円弧型押圧工具16が金属板13の各凹溝13aの間に位置するようにセットする。このとき、円弧型押圧工具16は、金属板13のセットを容易にするため、中央棒17の端面外方の離間した位置に待機している。その後、円弧型押圧工具16の円弧面16aを金属板13の中央面13b側に押し当て、円弧型押圧工具16を中央棒17の軸芯と平行に移動する。その結果、金属板13に複数の凹溝13aの間が中央棒14aの方向に順次押圧され、金属板13は、外周に8個の突堤フィン2が突出形成された放熱体の素体が形成される。その後、放熱体の素体は、前述した切断工程において、複数条の突堤フィン2の開口端側を平坦に形成する。   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.

図10に示した中央棒17は円柱状に形成され、図9に示した中央棒14aのように、外周に複数の突部14bが突出形成されていない。このような中央棒17であっても、円弧型押圧工具16を移動するとき、隣接する円弧型押圧工具16の間に金属板13の各凹溝13aが挟まれた状態になるので突堤フィン2が形成される。なお、突堤フィン2を精度良く美麗に形成する場合には、図9に示した、外周に複数の突部14bが突出形成された中央棒14aを用いることが望ましい。また、円弧型押圧工具16としては、円盤状のローラでなくとも、円弧面を形成した固定部材であっても良く、この場合は、円弧面を金属板13の各凹溝13aの間に摺動させながら成形する。   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.

図11乃至図13は、放熱体の変形例を示している。図11に示す放熱体20は、外周に形成される各突堤フィン21を収納部からV字状に屈曲形成し、左右の板面の間にV字状の空間を形成した例である。このようなV字状の突堤フィン21を形成するには、図9において示した押圧工具15として、先端に至るに従って順次幅狭になるように構成すれば良い。   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.

図12に示す放熱体22は、外周に形成される各突堤フィン23を矩形状に形成し、
を収納部からV字状に屈曲形成し、左右の板面の間に形成される空間23aの幅を大きくした例である。この例においては、図9において示した中央棒14aの外周に突出形成した複数の突部14bの幅を大きくするとともに、押圧工具15の幅を小さくすることにより、矩形状の突堤フィン23を形成することができる。
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.

図13に示す放熱体24は、多数の突堤フィン25を形成した例を示している。このように、突堤フィン25を多数にすると、金属板を蛇行屈曲させて突堤フィンを形成することから、開口側における突堤フィンの高さは必然的に低くなる。   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.

以上、本発明を実施例に基づいて具体的に説明したが、本発明は上記実施例に限定されるものではなく、その要旨を逸脱しない範囲内で種々変更可能であることは言うまでもない。例えば、放熱体に形成する突堤フィンの幅とその間の幅は、適宜に設定することができ、突堤フィンの幅よりもその間の幅を小さくしても良い。また、突堤フィンの高さ、および間隔は、全周において均一でなくとも、例えば放熱分布に応じて、高さや間隔等を適宜に変更しても良い。   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.

本発明にかかる電球形LED照明灯の放熱体を示す斜視図である。It is a perspective view which shows the heat radiator of the lightbulb-type LED lighting lamp concerning this invention. 図1に示す放熱体を開口端側1bから見た平面図である。It is the top view which looked at the heat radiator shown in FIG. 1 from the opening end side 1b. 図1に示す放熱体を基端側から見た斜視図である。It is the perspective view which looked at the heat radiator shown in FIG. 1 from the base end side. 図1に示す放熱体を電球形LED照明灯に配設した状態を示す斜視図である。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. 図1に示す放熱体を電球形LED照明灯に配設した状態を示す半断面図である。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. 図1に示す放熱体に金属コアプリント基板を配設した状態を示す平面図である。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. 本発明にかかる放熱体を形成する予備曲げ工程用の金型を示す説明図である。It is explanatory drawing which shows the metal mold | die for the pre-bending process which forms the heat radiator concerning this invention. 予備曲げ工程によって形成された金属板を示す平面図である。It is a top view which shows the metal plate formed of the pre-bending process. 放熱体を形成する成形工程用の金型を示す説明図である。It is explanatory drawing which shows the metal mold | die for the shaping | molding process which forms a heat radiator. 放熱体を形成する成形工程用金型の他の例を示す説明図である。It is explanatory drawing which shows the other example of the metal mold | die for a formation process which forms a heat radiator. 放熱体の突堤フィンをV字状に形成した実施例を示す斜視図である。It is a perspective view which shows the Example which formed the jetty fin of the heat sink in V shape. 放熱体の突堤フィンを矩形状に形成した実施例を示す斜視図である。It is a perspective view which shows the Example which formed the jetty fin of the heat radiator in the rectangular shape. 放熱体の突堤フィンを多数形成した実施例を示す斜視図である。It is a perspective view which shows the Example which formed many jetty fins of a heat radiator.

1 放熱体
1a 基端側
1b 開口端側
2 突堤フィン
3 収納部
4 口金
5 金属コアプリント基板
6 LED(発光ダイオード)
6a 放熱フィン
10 予備曲げ工程用金型
11 上型
12 下型
12a 溝
13 金属板
13a 凹溝
14 成形用金型
14a 中央棒
15 押圧工具
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)

基端側に設けられる電球の口金と、開口端側に設けられる複数個のLEDが表面側に実装されたプリント配線板との間に介在される放熱体であって、
上記放熱体は、熱伝導率が良好な金属板を蛇行屈曲させた複数条の突堤フィンが外周に形成されるとともに、内周には上記LEDの電源を生成する電源部を収納するように円筒状の収納部が形成され、
この突堤フィンは、上記収納部からの高さが上記基端側から上記開口端側に至るに従って暫時大きくなるように突出形成され、
上記開口端側の上記突堤フィン端面は、金属プリント配線板の裏面側が面接合するように平面に形成されたことを特徴とする電球形LED照明灯の放熱体。
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.
各突堤フィンは、収納部からU字状やV字状に屈曲形成され、左右の板面の間に空間を形成した請求項1に記載の電球形LED照明灯の放熱体。   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. 各突堤フィンは、外周に突出形成する個数に応じて開口端側の高さを異ならせた請求項1及び2に記載の電球形LED照明灯の放熱体。   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. 熱伝導性を有する金属板に対し、複数条の突堤フィンの頂部に対応させて複数の凹溝を形成すると共に、円筒状の収納部と同じ形状の中央面の周囲から所定角度屈曲して全体形状を略笠状に形成する予備曲げ工程と、
各々の上記凹溝の間に対して、各々押圧工具を外周方向から中心方向に向けて押圧して、各押圧工具の間に各々複数条の突堤フィンを形成する成形工程と、
複数条の上記突堤フィンの開口端側を平坦に形成する切断工程とを有し、
上記円筒状の収納部の周囲に上記凹溝の外面を頂部とした複数条の突堤フィンを蛇行させて屈曲形成することを特徴とする電球形LED照明灯の放熱体の形成方法。
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.
成形工程において、収納部と同じ外径を有する中央棒の先端に中央面を当接載置し、その後、各押圧工具を上記中央棒に向けて上記金属板が上記中央棒の外周面に当接するまで押圧する請求項4に記載の電球形LED照明灯の放熱体の形成方法。   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. 成形工程における押圧工具は、先端が隣接する突堤フィンの間の収納部の胴部の幅に設定され、上記中央棒と直角な放射方向外周から移動して上記金属板が上記中央棒の外周面に当接するまで押圧する請求項4に記載の電球形LED照明灯の放熱体の形成方法。   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. 成形工程における押圧工具は、周面が隣接する突堤フィンの間の収納部の胴部の幅に設定された円弧面を有する円弧型押圧工具を構成し、この円弧型押圧工具の円弧面と上記中央棒の外周面との間隔は上記金属板の板厚よりも僅かに大きく設定して配設され、
中央棒の先端に金属板の中央面を当接載置した後、上記円弧型押圧工具が上記中央面の周囲から開口端側に移動するように、上記中央棒と上記円弧型押圧工具とを上記中央棒と平行に相対的に移動し、上記金属板が上記中央棒の外周面に順次当接するよう押圧する請求項4に記載の電球形LED照明灯の放熱体の形成方法。
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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