200916694 九、發明說明： -【發明所屬之技術領域】 .本發明涉及一種發光二極體燈具，尤其涉及一種具有 散熱結構之發光二極體燈具。 【先前技術】 發光二極體光源作為一種新興之第三代光源，雖然現 在還不能大規模取代傳統之白熾燈，惟，其具有工作旁命 長、節能、環保等優點，而普遍被市場所看好。而且，目 前由發光二極體組成之模組能產生大功率、高亮度之光 源，完全可以取代現有白熾燈實現室内外照明，亦將廣泛 地、革命性地取代傳統之白熾燈等現有之光源，進而成為 符合節能環保主題之主要光源。 曰然而，功率、亮度越大之發光二極體或其模組產生之 熱里越大，在體積相對較小之發光二極體燈具内難於散 么=去故，發光一極體尚存在較大散熱技術瓶頸，這亦係 目前大功率、高亮度發光二極體燈具市場化最難突破之關 鍵之處。目雨業界通用之散熱方案係在該燈具内設置一散 熱器，通過該散熱器表面與自然對流空氣接觸之方式將数 量散發到周圍空氣中。所以要滿足高功率、高亮度之發^ 燈散熱需求以使其能正常工作防止光衰，就必須提 :月…、面積很大之放熱&。這樣通常會導致散熱器在燈具 中所占體積大，整體燈且触 ,,^ 股燈具肢積亦大，使得這種燈具結構體積 較大而難以在室内照明中推廣應用。、 7 200916694 【發明内容】 有鑒於此，有必要提供一種用在發光二極體燈具内具 有較佳散熱性能之散熱裝置。 一種具有散熱結構之發光二極體燈具，其包括一燈 座、與該燈座連接之一散熱器、和與該散熱器導熱連接之 複數發光二極體模組，該散熱器包括一中空筒體，該筒體 一端與周圍空氣連通，該筒體另一端與該燈座連通，該燈 座上设置有與周圍空氣連通之複數通氣孔。 上述赉光一極體燈具之散熱器筒體内與該燈座形成一 ，迴圈之氣流通路能有效地加強氣流流通及加大散熱器與 虱流接觸之面積，從而可在有限之體積内實現燈具之良好 放熱進而解决了兩功率發光二極體燈具之散熱問題。 【實施方式】 ^圖I-2示出本發明具有散熱結構之發光二極體燈具戈 二一實施例’其包括-燈座10、與該燈座10連接之散熱I 、均勾貼設在該散熱器2G表面上之複數發光二極體㈣ 30和安裝在該燈座1Q内之氣流產生裝置40(如圖4所示） #亡述燈座10包括一燈帽12、連接於該燈帽12上之一 弟 盒·體 1 4 和纺? gjt 一該弟一盍體14對扣之一第二蓋體16。髮 燈帽12為一標準螺纟文产^ 〜 _ ^ 、 $、，文燈巾目，適配于普通螺合式燈頭。該澤 盖脱14為一由塑狀;%]_剩； 》料衣成之碗狀體，其包括底端 帽12連接之一瞢彬興届 ^連接邛140和與該連接部14〇連接之_ 第一碗壁142。該碗帶7 _ 42之口徑由下向上逐漸增大，而开j 成一向上開口之碗肤芸驶 ^ 狀皿體，該弟—碗壁142在 200916694 .壁周緣均勻開設三安裝孔1420，用於供螺桿件（圖未示） 穿過與第二蓋體16螺合。該第二蓋體16為一由塑膠或金 屬材料製成之倒置碗狀體，其包括一環形結合部160和與 該結合部160連接之一第二碗壁162。該結合部160之直徑 略小於該連接部140之直徑，其内設置有内螺紋1600，以 與散熱器20底部螺合連接，該結合處160之管壁上均勻開 設有三透孔1602。該第二碗壁162與該結合部160連接之 上半部分之口徑由上向下逐漸增大，該第二碗壁162之上 半部分均勻開設有與發光二極體模組30對應之複數穿孔 164，該等穿孔164大致自下向上穿透該碗壁162以供連接 發光二極體模組30之電源線組（圖未示）穿過；該第二碗 壁162下半部分為口徑均勻之環狀體，其開口大小與第一 蓋體14之開口相適配，該環狀體均勻開設有複數通氣孔 166以供氣流進入第一、二蓋體14、16形成之空間内，且 該第二碗壁162在開口之内壁周緣距均設置有三螺孔（圖 未示），該等螺孔分別與第一蓋體14之安裝孔1420對應以 與穿過該安裝孔1420之螺桿件配合將該第一、二蓋體14、 16結合在一起。該第一、二蓋體14、16結合在一起形成之 空間可容置該發光二極體燈具之電子整流器（圖未示）。此 外，在該發光二極體燈具内設置有一方向感測器（圖未 示），該感測器可以係安裝在該燈座10内，亦可以係在該 散熱器20之筒體22内。因為空氣受熱會向上移動，一般 氣流自然對流之方向係向上之，所以該方向感測器可用於 偵測該發光二極體燈具之擺放方向，以控制該氣流產生裝 200916694 置4〇產生方向向上之強制氣流。 如圖3所示，上述散敎 '紹、銅等金屬材料— 由導熱性能良好之材料如 M 22 , 體形成。該散熱器20具有一長管狀筒200916694 IX. Description of the invention: - [Technical field to which the invention pertains] The present invention relates to a light-emitting diode lamp, and more particularly to a light-emitting diode lamp having a heat dissipation structure. [Prior Art] As a new generation of light source, the light-emitting diode light source can not replace the traditional incandescent lamp on a large scale. However, it has the advantages of longevity, energy saving and environmental protection. I am optimistic. Moreover, the module composed of the light-emitting diode can generate a high-power, high-brightness light source, which can completely replace the existing incandescent lamp for indoor and outdoor illumination, and will also replace the existing light source such as the traditional incandescent lamp widely and revolutionarily. And become the main light source in line with the theme of energy conservation and environmental protection. However, the greater the power and brightness, the greater the heat generated by the LED or its module, and it is difficult to disperse in a relatively small volume of a light-emitting diode lamp. The bottleneck of large heat dissipation technology is also the key point for the most difficult breakthrough in the marketization of high-power, high-brightness LED lamps. The heat dissipation solution commonly used in the rain industry is to provide a heat sink in the luminaire, and the surface of the heat sink is radiated into the surrounding air by contact with natural convective air. Therefore, in order to meet the heat dissipation requirements of high-power, high-brightness lamps, so that they can work properly to prevent light decay, it is necessary to mention: month..., large area of heat release & This usually results in a large volume of the radiator in the luminaire, and the overall lamp is touched, and the luminaires of the luminaire are also large, making the luminaire structure large and difficult to promote in indoor lighting. 7, 200916694 SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a heat sink having better heat dissipation performance in a light-emitting diode lamp. A light-emitting diode lamp having a heat dissipation structure, comprising: a lamp holder, a heat sink connected to the lamp holder, and a plurality of light-emitting diode modules thermally connected to the heat sink, the heat sink comprising a hollow tube One end of the cylinder is in communication with the surrounding air, and the other end of the cylinder is in communication with the lamp holder. The lamp holder is provided with a plurality of vent holes communicating with the surrounding air. The heat sink cylinder of the above-mentioned neon one-pole lamp forms a space with the lamp holder, and the airflow path of the loop can effectively enhance the airflow and increase the area of the heat sink and the turbulent contact, thereby realizing in a limited volume. The good heat release of the lamp solves the heat dissipation problem of the two-power LED lamp. [Embodiment] FIG. 1-2 shows a light-emitting diode lamp with a heat dissipation structure according to the present invention. The present invention includes a lamp holder 10 and a heat-dissipating I connected to the lamp holder 10. a plurality of light-emitting diodes (4) 30 on the surface of the heat sink 2G and an airflow generating device 40 (shown in FIG. 4) installed in the lamp holder 1Q. The lamp holder 10 includes a lamp cap 12 connected to the lamp. One of the caps 12 on the cap 12 and the body 1 4 and the spun gjt one of the corpses 14 is a pair of second cover bodies 16. The hair cap 12 is a standard screw ^ ^ ^ ~ _ ^, $,, light lamp, suitable for ordinary screw-type lamp holders. The Ziggella 14 is a plastic-shaped; %]_ remaining; 》-suited bowl-shaped body, which includes a bottom end cap 12 connected to the ^ Binxing ^ connecting 邛 140 and connected to the connecting portion 14 〇 The first bowl wall 142. The diameter of the bowl belt 7 _ 42 gradually increases from the bottom to the top, and the opening j is formed into an upwardly open bowl of the skin, and the bowl 142 is uniformly opened at the periphery of the wall of the wall 16420. A screw member (not shown) is threaded through the second cover body 16. The second cover 16 is an inverted bowl made of plastic or metal material and includes an annular joint 160 and a second bowl wall 162 coupled to the joint 160. The diameter of the joint portion 160 is slightly smaller than the diameter of the connecting portion 140. The inner thread 1600 is disposed in the bottom of the joint portion 160 to be screwed to the bottom of the heat sink 20. The three through holes 1602 are uniformly formed in the wall of the joint portion 160. The upper portion of the second bowl wall 162 and the upper portion of the joint portion 160 is gradually increased from the top to the bottom, and the upper portion of the second bowl wall 162 is evenly provided with a plurality of corresponding portions of the light emitting diode module 30. The through hole 164 penetrates the bowl wall 162 from the bottom to the bottom of the bowl wall 162 for connecting the power cord set (not shown) of the LED module 30; the lower half of the second bowl wall 162 is caliber a uniform annular body having an opening size adapted to the opening of the first cover body 14. The annular body is uniformly provided with a plurality of vent holes 166 for airflow into the space formed by the first and second covers 14, 16 And the second bowl wall 162 is provided with three screw holes (not shown) at the periphery of the inner wall of the opening, and the screw holes respectively correspond to the mounting holes 1420 of the first cover 14 and the screw passing through the mounting hole 1420. The fitting cooperates to bond the first and second covers 14, 16 together. The first and second covers 14, 16 are combined to form a space for accommodating the electronic rectifier of the LED (not shown). In addition, a directional sensor (not shown) is disposed in the illuminating diode lamp, and the sensor may be mounted in the lamp holder 10 or in the barrel 22 of the heat sink 20. Because the air is heated upwards, the direction of the natural convection of the airflow is upward. Therefore, the direction sensor can be used to detect the direction in which the LEDs are placed to control the airflow generation. Forced airflow upwards. As shown in Fig. 3, the above-mentioned dilute metal materials such as shovel and copper are formed of a material having good thermal conductivity such as M 22 . The radiator 20 has a long tubular tube
遐22，該筒體22内壁> #锊础q J 條形内籍片241等内體22之徑向向内延伸有複數 D 4内1片24關於該筒體22中心軸線均 =!該等内韓片24之厚度自筒體内壁開始向内 化## 1…二、大致呈銳角三角形但頂角尖端被鈍 化幵/狀。該_體22外壁 > 並你a & aL ^ 26, 卜土，口其偟向向外延伸有複數導熱臂 該寻導熱#26關於該筒體22中心 佈，該等導熱臂26之數量對應發光二極體模組30之^量， =在不R實施例中可為不同之數量，而在本實施例中為對 應六發先二極體模組30之六導熱臂26。該等導埶臂仏之 延長線將相交於該筒體22之中心軸線，該導熱臂％向兩 側垂直延伸有複數對外鰭片26〇，每一對外縛片·均關於 對應之導熱臂26對稱，且該等外籍片細之長度由裏向外 逐漸遞增。每—導熱f 26之末端均與最外端之外縛片260 内側表面連接，所以每一導熱臂26最外側之—對外鳍片 260之外側表面均為一平滑平面。該筒體22底端向下=設 一螺合筒28’該螺合筒28設置有與第二蓋體16結合部丄二 之内螺紋1600相適配之外螺紋（未標號），該螺合筒之 筒體上均勻開設有與結合部160之透孔16〇2對°應^之三螺 孔280。在該散熱器20螺合筒28與第二蓋體16 :結:部 160螺合完成時’該等結合部160之透孔ι6〇2與該等螺孔 280對應並供螺釘（圖未示）穿過而與該等螺孔28〇螺人， 10 200916694 從而進一步鎖固散熱器20與該第二蓋體16。在其他實施例 中，可以不設置該散熱器20螺合筒28之外螺紋及結合部 160之内螺紋，該散熱器20與該第二蓋體16之連接可以係 通過螺釘穿過該結合部160之透孔1602與螺合筒28之螺 孔280螺合來實現。此外，為了該筒體22具有較理想之煙 囪效應，以利於筒體22内之氣流流通，該筒體22之長度 與直徑之比例即係長徑比選取為十比一以上或五比一以 上，在本實施例中該筒體22之長徑比優選為十比一，一般 來說長徑比太低，其效杲不佳能達到十比一以上較佳。 請一併參閱圖2，該發光二極體模組30包括一矩形電 路板32，該電路板32之形狀大小略小於散熱器20最外侧 之外鰭片260,其上並排安裝有複數個發光二極體元件34。 如圖4所示，上述氣流產生裝置40安裝於該燈座10 内，其位於該第二蓋體16之第二碗壁162與結合部160之 連接處，該氣流產生裝置40正對該散熱器20筒體22與該 結合部160内連通之通道，以便其產生之氣流直接從該通 道内通過。該氣流產生裝置40可以係超聲波風扇、壓電動 力風冷等氣冷裝置，在本實施例中該氣流產生裝置為馬達 驅動之風扇。 上述發光二極體燈具在組裝時，該氣流產生裝置40通 過螺釘或粘貼等方式固定于該第二蓋體16之第二碗壁162 與結合部160之連接處，再用螺桿件穿過第一蓋體14之安 裝孔1420與第二蓋體16之螺孔螺合，而將第一、二蓋體 14、16結合在一起。該散熱器20底端之螺合筒28與第二 11 200916694 蓋體16上結合部160螺合連接。該等發光二極體模組30 ' 分別貼置在該散熱器20最外側之外鰭片260之外侧面上， — 且發光二極體模組30與對應外鰭片260之間可填充如導熱 膠之類之導熱介質，以增加它們間之導熱能力。 上述發光二極體燈具在使用時，為了使其内之空氣在 該散熱器20筒體22之煙囪效應下而受熱由下向上對流， 應該筒體22大致豎直擺放。該發光二極體模組30將熱量 傳導到與其接觸之散熱器20之外鰭片260上，再通過導熱 臂26將熱量均勻分佈到散熱器20導熱筒體22及其内之内 鰭片24上。該筒體22外壁、該導熱臂26和該外鰭片260 直接與周圍之空氣接觸將熱量散發到周圍之空氣中去。該 筒體22内與該第一、二蓋體14、16形成之空間連通並形 成一氣流通路’亦就係氣流在該氣流產生裝置4 0之驅動 下，從該第二蓋體16之通氣孔166進入，再經筒體22内 壁受熱，最後從筒體22頂端出口流出，或者在該發光二極 體燈具與圖1所示之相反位置放置時，空氣從筒體22底端 進入，再經筒體22内壁熱交換受熱，最後從該第二蓋體16 之通氣孔166出口流出。安裝在該燈座10内之氣流產生裝 置40順著該散熱器20筒體22内之自然氣流方向產生強制 氣流，極大地促進了該散熱器20内外之氣流迴圈，從而快 速將該散熱器20之内外鰭片24、260上之熱量散發到氣流 中去並被帶走，進而達到高效散熱之目之。 如圖5所示，本發明第二實施例中具有散熱結構之發 光二極體燈具，與第一實施例相比，該發光二極體燈具之 12 200916694 氣流產生裝置50安裝在該散熱器20之頂部，完全覆蓋該 散熱器20筒體22之頂部。該氣流產生裝置50具有與該散 熱為20頂部相匹配之圓形扇框（未標號），該扇框可通過 上螺釘或粘貼等方式固定在該散熱器20之頂部，從而使其 產生之氣流主要在該散熱器2〇之筒體22内流通，有小部 分氣流經過散熱器20之外鰭片260，對該等外鰭片260及 安裝其上之發光二極體模組30進行附帶散熱。 在其他實施例中，上述發光二極體燈具亦可以不設置 任何氣流產生裝置，只需在發光二極體燈具使用時，使其 散熱為20大致豎直擺放，該發光二極體燈具内之空氣將在 該散熱器2G筒體22之煙自效應下，由下向上對流而將發 光二極體模組30產生之熱量散發到周圍環境中。 综上所述，本發明確已符合發明專利之要件，遂依法 ，出專射請。惟，以上所述者僅為本發明之較佳實施方 二观制本案之申請專利範圍。舉凡熟悉本案 ^之人士錢本發明之精神所作之等效修飾 應涵蓋於以下申請專利範圍内。 【圖式簡單說明】 極體燈具之第 接體燈具之立體 圖1係本發明具有散熱結構之發光 實施例之立體組合圖。 圖2係圖1中具有散熱結構之發光 分解圖。 圖3係圖2中散熱器之立體圖。 圖4係圖1中沿剖線IV_IV之剖示圖 13 200916694 圖5係本發明具有散熱結構之發光二極體燈具之第二 '實施例之立體組合圖。 —【主要元件符號說明】 燈座 10 燈帽 12 第一蓋體 14 連接部 140 第一碗壁 142 安裝孔 1420 第二蓋體 16 結合部 160 内螺紋 1600 透孔 1602 第二碗壁 162 穿孔 164 通氣孔 164 散熱器 20 筒體 22 内鰭片 24 導熱臂 26 外鰭片 260 螺合筒 28 螺孔 280 發光二極體模組 30 電路板 32 發光二極體元件 34 氣流產生裝置 40、50 14遐22, the inner wall of the cylinder 22>#锊基q J strip-shaped inner piece 241 and the like, the inner body 22 extends radially inwardly with a plurality of D 4 in one piece 24 with respect to the central axis of the barrel 22 =! The thickness of the inner Korean film 24 begins to internalize from the inner wall of the cylinder. ## 1... Second, it is roughly an acute triangle, but the tip of the apex angle is passivated. The outer wall of the body 22 > and you a & aL ^ 26, the soil, the mouth of the mouth extends outwardly with a plurality of heat conducting arms, the heat conduction #26 about the center of the cylinder 22, the number of the heat conducting arms 26 Corresponding to the amount of the LED module 30, = can be a different number in the R embodiment, and in this embodiment is the six heat conducting arms 26 corresponding to the six-shot pre-diode module 30. The extension wires of the guide arms will intersect the central axis of the cylinder 22. The heat transfer arms extend perpendicularly to both sides with a plurality of external fins 26, each of which is associated with the corresponding heat conducting arm 26 Symmetrical, and the length of the foreign sheets is gradually increased from the inside to the outside. The end of each heat conduction f 26 is connected to the inner surface of the outermost outer tab 260, so that the outermost side of each heat conducting arm 26 - the outer side surface of the outer fin 260 is a smooth plane. The bottom end of the cylinder 22 is downwardly provided with a screwing cylinder 28'. The screwing cylinder 28 is provided with an external thread (not labeled) which is adapted to the internal thread 1600 of the joint portion of the second cover body 16, the screw The three-screw hole 280 of the through hole 16 〇 2 of the joint portion 160 is evenly opened. When the heat sink 20 is engaged with the second cover 16 and the second portion 16 is completed, the through holes ι6 〇 2 of the joint portions 160 correspond to the screw holes 280 and are provided with screws (not shown). Passing through the screw holes 28, 10 200916694 to further lock the heat sink 20 and the second cover 16 . In other embodiments, the external thread of the heat sink 20 and the internal thread of the joint portion 160 may not be disposed, and the connection between the heat sink 20 and the second cover 16 may pass through the joint through a screw. The through hole 1602 of the 160 is screwed into the screw hole 280 of the screwing cylinder 28 to achieve. In addition, in order to facilitate the airflow of the cylinder 22 in order to facilitate the airflow in the cylinder 22, the ratio of the length to the diameter of the cylinder 22, that is, the aspect ratio is selected to be more than ten to one or five to one. In the present embodiment, the aspect ratio of the cylinder 22 is preferably ten to one. Generally, the aspect ratio is too low, and the effect is less than ten to one. Referring to FIG. 2 together, the LED module 30 includes a rectangular circuit board 32. The circuit board 32 has a shape slightly smaller than the outermost fins 260 of the heat sink 20, and a plurality of lights are mounted side by side. Diode element 34. As shown in FIG. 4, the airflow generating device 40 is mounted in the socket 10, and is located at the junction of the second bowl wall 162 of the second cover 16 and the joint portion 160. The tubular body 22 communicates with the passage in the joint portion 160 such that the generated airflow passes directly through the passage. The airflow generating device 40 may be an air cooling device such as an ultrasonic fan or a piezo-electric air-cooling device. In the present embodiment, the airflow generating device is a motor-driven fan. When the light-emitting diode lamp is assembled, the airflow generating device 40 is fixed to the joint of the second bowl wall 162 of the second cover 16 and the joint portion 160 by screwing or pasting, and then passes through the screw member. The mounting hole 1420 of the cover 14 is screwed with the screw hole of the second cover 16, and the first and second covers 14, 16 are joined together. The screwing cylinder 28 at the bottom end of the heat sink 20 is screwed to the joint portion 160 of the cover body 16 of the second 11 200916694. The LED modules 30 ′ are respectively disposed on the outer sides of the outer fins 260 of the outermost surface of the heat sink 20 , and the light emitting diode module 30 and the corresponding outer fins 260 can be filled with A heat transfer medium such as a thermal conductive adhesive to increase the thermal conductivity between them. When the above-mentioned light-emitting diode lamp is used, in order to convect the air inside the heat sink 20 under the chimney effect of the heat sink 20, the cylinder 22 should be placed substantially vertically. The LED module 30 conducts heat to the fins 260 outside the heat sink 20 in contact therewith, and then distributes heat evenly through the heat conducting arms 26 to the heat sink barrel 22 of the heat sink 20 and the inner fins 24 therein. on. The outer wall of the barrel 22, the heat conducting arm 26 and the outer fin 260 are in direct contact with the surrounding air to dissipate heat into the surrounding air. The inside of the cylinder 22 communicates with the space formed by the first and second covers 14, 16 to form an air flow path '. The air flow is also driven by the air flow generating device 40, and the second cover 16 is driven. The air hole 166 enters, is heated by the inner wall of the cylinder 22, and finally flows out from the top end outlet of the cylinder 22, or when the light emitting diode lamp is placed opposite to the position shown in FIG. 1, the air enters from the bottom end of the cylinder 22, and then The heat is exchanged by the inner wall of the cylinder 22, and finally flows out from the outlet of the vent hole 166 of the second cover 16. The airflow generating device 40 installed in the lamp holder 10 generates a forced airflow along the direction of the natural airflow in the casing 22 of the radiator 20, which greatly promotes the airflow loop inside and outside the radiator 20, thereby quickly dissipating the radiator. The heat on the inner and outer fins 24, 260 is radiated into the airflow and taken away, thereby achieving efficient heat dissipation. As shown in FIG. 5, in a second embodiment of the present invention, a light-emitting diode lamp having a heat dissipation structure is mounted on the heat sink 20 of the 12200916694 airflow generating device 50 of the light-emitting diode lamp as compared with the first embodiment. At the top, it completely covers the top of the barrel 22 of the heat sink 20. The airflow generating device 50 has a circular fan frame (not labeled) matching the top of the heat dissipation 20, and the fan frame can be fixed on the top of the heat sink 20 by screwing or pasting, etc., thereby generating the airflow. Mainly flowing in the tube 22 of the heat sink 2, a small portion of the airflow passes through the fin 260 outside the heat sink 20, and the external fin 260 and the LED module 30 mounted thereon are provided with heat dissipation. . In other embodiments, the light-emitting diode lamp may not be provided with any airflow generating device, and only needs to dissipate the heat-dissipating device into a substantially vertical position when the light-emitting diode lamp is used, and the light-emitting diode lamp is disposed inside the light-emitting diode lamp. The air will dissipate the heat generated by the LED module 30 to the surrounding environment by the convection from bottom to top under the smoke self-effect of the heat sink 2G cylinder 22. In summary, the present invention has indeed met the requirements of the invention patent, and according to the law, a special shot. However, the above is only the preferred embodiment of the present invention. Equivalent modifications made by the person skilled in the art of the present invention should be included in the scope of the following patent application. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective assembled view of a light-emitting embodiment of the present invention having a heat dissipation structure. Figure 2 is an exploded perspective view of the heat dissipation structure of Figure 1. Figure 3 is a perspective view of the heat sink of Figure 2. Figure 4 is a cross-sectional view taken along line IV-IV of Figure 1. Figure 13 200916694 Figure 5 is a perspective view of a second embodiment of a light-emitting diode lamp having a heat dissipation structure of the present invention. — [Main component symbol description] Lamp holder 10 Lamp cap 12 First cover body 14 Connection portion 140 First bowl wall 142 Mounting hole 1420 Second cover body 16 Joint portion 160 Internal thread 1600 Through hole 1602 Second bowl wall 162 Perforation 164 Vent 164 Heat sink 20 Cylinder 22 Inner fin 24 Thermal arm 26 External fin 260 Screw barrel 28 Screw hole 280 Light-emitting diode module 30 Circuit board 32 Light-emitting diode element 34 Airflow generating device 40, 50 14