201000826 九、發明說明： 【發明所屬之技術領域】 本發明涉及一種燈具，尤其涉及一種LED燈具。 【先前技術】 傳統之日光燈管因含有汞金屬於強調環保設計之時代 下已不符合社會期望，LED不含污染元素之特性及逐年提 高亮度之優勢下可望取代傳統之螢光燈管。具體請參閱 Daniel A. Steigerwald 等人於 IEEE Journal on Selected Topics in Quantum Electronics, Vol. 8, No.2, March/April 2002 上發表之文獻 Illumination With Solid State Lighting Technology ° 然而目前LED取代螢光燈管之速度並不如預期，除了 LED燈組模組與原用之燈組不同無法直接替代之外，更重 要的原因係LED價格偏高。雖然市面上已開始出現可直接 與螢光燈組替換之LED燈具模組，但這些燈組為了達到與 螢光燈管相當之亮度，通常會採用多顆之LED。舉例來說， ' 一般取代20W螢光燈管之LED燈具會使用至少16顆並排 之LED，LED之使用數目造成LED燈組價格居高不下。 因此’如何設計燈具使其在使用盡可能少之LED之同 時，其發光亮度可達到要求從而降低燈具之成本，便成為 業界之一個研究重點。 【發明内容】 有鑑於此’有必要提供一種可直接替代先前技術中之 螢光燈管且可降低LED之使用數量從而降低成本之燈具。 5 201000826 一種燈具，其包括至少一：led發光元件、一導光體及 一與該導光體相對設置之反射體，該導光體包括一入光 面 與該入光面相鄰之出光面及一與該出光面相對之底 面，該導光體之底面貫穿開設有一凹槽，該反射體包括一 反射面，該反射面與該導光體之底面相對，該反射面設有 一與該導光體底面之凹槽形狀相配合之凸起，該至少一 LED發光元件與該導光體之入光面相對。 相較於先前技術，該燈具由於具有一導光體及一反射 體，該導光體可將設置於其側面之LED發光元件之光導出 至出光面射體可進一步將從導光體底面出射之光反射 回去，從出光面發散出去，該導光體之底面貫穿開設 凹槽’該反射體對應設有—與該導紐底面之凹槽形狀相 :己合之凸起’該凸起可將該凹槽表面發出之光全部反射回 光體從而提南導光體之出光率，從而使得該燈具在僅 ^用較彡LED發光元件之情況下，實現發光亮度高之優 點，從而可節省燈具之製造成本。 【實施方式】 對本發明作進 下面將結合附圖 ^見圖1至圖3，本發明實施例提供—種燈具， :二：導光體U、™與該導光體11相對設置之反射體 12及後數個LED發光元件3〇。 鄰之3光體11包括—入光面m、一與該入光面111相 光體^ 112及一與該出光面112相對之底面113。該導 用於引導發光元件3〇出射光束之傳輸方向，將其 201000826 轉換為面光源出射。該導光體π之形狀為半圓柱體，該導 光體11包括一貫穿開設於該底面Π3中心之凹槽115。該 凹槽115之橫截面為半圓形。該導光體11可採用壓克力、 玻璃或聚碳酸酯等透明材質製成。該複數個LED發光元件 30相對設置於該導光體11之入光面111 一側。該凹槽115 之内側面上還可設置有網點114，以破壞光線之全反射路 徑，以提高導光體11出射光束之輝度和均勻性。該網點114 可設置為以一定規律呈疏密分佈。 該反射體12包括一半圓柱形之本體120。該反射體12 包括一反射面121，該反射體12之反射面121與該導光體 11之底面113相對。該反射體12還包括一位於本體120中 心且凸出於本體之半圓形凸起122。該凸起122與該凹槽 115之形狀相互配合，使得該導光體11與該反射體12相互 結合形成一圓柱體。進一步地，該反射體12之反射面121 上可設置反射膜，以使經導光體11底面113透射出來之光 反射到導光體11内經出光面112發散出去，以提高導光體 11之發光輝度。 該燈具100還包括兩個電路板20，該兩個電路板20 分別設置於該反射體12之兩端’該每個電路板20之内侧 固定有三個LED發光元件30。該三個LED發光元件30圍 成三角形排佈於該電路板20上。 該電路板20之外側即與該LED發光元件30相對之侧 面上設置有插頭21，以使該燈具100可直接替換該先前技 術之螢光燈管。 7 201000826 >可以理解’該燈具之電路板2G亦可僅為一個，而 設置於該反射體12之一端’該複數個發光元件如僅設置 於該導光體11之-側即僅設置於—個電路板2q上。該發 光兀件30之個數可為一個或者一個以上。 J得注意’該導光體11及反射體12之形狀不應局限 於本實施例提供之這種情況，例如，該導光體u之形狀還 可為半圓台體、長方體、三棱柱體或其他形狀等。該反射 體二2之形狀亦可為半圓台體、長方體、三棱柱體或其他形 狀荨，只要其反射Φ 12ι與該導光體u之底面113相對且 可反射光線即可。 相較於先前技術，該燈具由於具有一導光體及一反射 體，該導光體可將設置於其側面之LED發光元件之光導出 至出光面’反射體可進-步將從導光體底面出射之光反射 回去，從出光面發散出纟’該導光體之底面貫穿開設有一 凹槽’該反射體對應設有-與該導光體底面之凹槽形狀相 =合之凸起’該凸起可將該凹槽表面發出之光全部反射回 ¥光體’從而提高導光體之出光率，從而使得該燈具於僅 使用較少LED發光元件之情況下’實現發光亮度高之優 點’從而可節省燈具之製造成本。 ^綜上所述，本發明確已符合發明專利之要件，遂依法 提出專利申請。惟’以上所述者僅為本發明之較佳實施方 式，自不能以此限制本案之申請專利範圍。舉凡熟悉本案 技藝之人士援依本發明之精神所作之等效修飾或變化，皆 應涵蓋於以下申請專利範圍内。 8 201000826 【圖式簡單說明】 圖1係本發明實施例提供之燈具之立體示意圖。 圖2係圖1中之燈具之立體分解示意圖。 圖3係圖1中之燈具之反射體之另一個角度之立體示意圖。 【主要元件符號說明】 燈具 100 導光體 11 反射體 12 發光元件 30 入光面 111 出光面 112 底面 113 凹槽 115 網點 114 本體 120 反射面 121 凸起 122 電路板 20 插頭 21201000826 IX. Description of the Invention: [Technical Field] The present invention relates to a luminaire, and more particularly to an LED luminaire. [Prior Art] Conventional fluorescent tubes have been inconsistent with social expectations due to the fact that they contain mercury metal in an era of environmentally-friendly design. LEDs are expected to replace traditional fluorescent tubes without the characteristics of polluting elements and the advantages of increasing brightness year by year. For details, see Daniel A. Steigerwald et al., IEEE Journal on Selected Topics in Quantum Electronics, Vol. 8, No. 2, March/April 2002. Illumination With Solid State Lighting Technology ° However, LEDs currently replace fluorescent tubes. The speed is not as expected, except that the LED light module is not directly replaceable with the original light group. The more important reason is that the LED price is high. Although LED luminaire modules that can be directly replaced with fluorescent lamps have begun to appear on the market, these lamps typically use multiple LEDs in order to achieve brightness comparable to fluorescent tubes. For example, 'LEDs that typically replace 20W fluorescent tubes will use at least 16 side-by-side LEDs, and the number of LEDs used will keep LED lamp prices high. Therefore, it is a research focus of the industry to design a luminaire so that it can achieve the required brightness and reduce the cost of the luminaire while using as few LEDs as possible. SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a luminaire that can directly replace the fluorescent tube of the prior art and can reduce the number of LEDs used thereby reducing the cost. 5 201000826 A luminaire comprising at least one of: a led illuminating element, a light guiding body and a reflector disposed opposite the light guiding body, the light guiding body comprising a light emitting surface adjacent to the light incident surface And a bottom surface opposite to the light-emitting surface, a bottom surface of the light guide body defines a groove, the reflector body includes a reflective surface, the reflective surface is opposite to the bottom surface of the light guide body, and the reflective surface is provided with a guide The concave shape of the bottom surface of the light body is matched with the protrusion, and the at least one LED light emitting element is opposite to the light incident surface of the light guiding body. Compared with the prior art, the luminaire has a light guide body and a reflector, and the light guide body can guide the light of the LED light-emitting component disposed on the side surface thereof to the light-emitting surface-emitting body, and can further exit from the bottom surface of the light guide body. The light is reflected back and diffused from the light exiting surface, and the bottom surface of the light guiding body penetrates through the groove. The reflector is correspondingly provided with the groove shape of the bottom surface of the guide button: the convex portion of the protrusion is The light emitted from the surface of the groove is totally reflected back to the light body to extract the light-emitting rate of the south light guide body, so that the lamp can realize the advantage of high light-emitting brightness when only the light-emitting element of the LED is used, thereby saving The manufacturing cost of the luminaire. [Embodiment] The present invention will be described below with reference to the accompanying drawings in which: FIG. 1 to FIG. 3, the embodiment of the present invention provides a luminaire, and two: a reflector disposed opposite to the light guide body U, TM and the light guide body 11 12 and the last few LED light-emitting elements 3〇. The adjacent 3-light body 11 includes a light-incident surface m, a light-emitting surface 112 opposite to the light-incident surface 111, and a bottom surface 113 opposite to the light-emitting surface 112. The guide guides the transmission direction of the light-emitting element 3 to the outgoing beam, and converts its 201000826 into a surface light source. The shape of the light guide body π is a semi-cylindrical body, and the light guide body 11 includes a groove 115 penetrating through the center of the bottom surface Π3. The groove 115 has a semicircular cross section. The light guide body 11 can be made of a transparent material such as acrylic, glass or polycarbonate. The plurality of LED light-emitting elements 30 are disposed opposite to the light-incident surface 111 of the light guide 11. The inner side of the groove 115 may also be provided with a mesh point 114 to destroy the total reflection path of the light to improve the brightness and uniformity of the light beam emitted from the light guide 11. The dots 114 can be arranged to be distributed in a regular pattern. The reflector 12 includes a body 150 that is half cylindrical. The reflector 12 includes a reflecting surface 121, and the reflecting surface 121 of the reflector 12 is opposite to the bottom surface 113 of the light guiding body 11. The reflector 12 further includes a semi-circular projection 122 located at the center of the body 120 and projecting from the body. The protrusions 122 cooperate with the shape of the groove 115 such that the light guide body 11 and the reflector body 12 are combined to form a cylinder. Further, a reflective film may be disposed on the reflective surface 121 of the reflector 12 so that the light transmitted through the bottom surface 113 of the light guide 11 is reflected into the light guide body 11 and diffused through the light exit surface 112 to improve the light guide body 11. Luminous brightness. The luminaire 100 further includes two circuit boards 20, which are respectively disposed at opposite ends of the reflector 12, and three LED illuminating elements 30 are fixed inside the circuit board 20. The three LED light emitting elements 30 are arranged in a triangle on the circuit board 20. A plug 21 is disposed on the outer side of the circuit board 20 opposite to the LED lighting element 30, so that the lamp 100 can directly replace the prior art fluorescent lamp. 7 201000826 > It can be understood that the circuit board 2G of the lamp may be only one, and is disposed at one end of the reflector 12. The plurality of light-emitting elements are disposed only on the side of the light guide body 11, that is, only - on a circuit board 2q. The number of the light-emitting elements 30 may be one or more. It should be noted that the shape of the light guide 11 and the reflector 12 should not be limited to the case provided by the embodiment. For example, the shape of the light guide u may be a semi-circular body, a rectangular parallelepiped, a triangular prism or Other shapes, etc. The shape of the reflector 2 may also be a semi-circular body, a rectangular parallelepiped, a triangular prism or other shaped crucible, as long as the reflection Φ 12ι is opposite to the bottom surface 113 of the light guide u and can reflect light. Compared with the prior art, the luminaire has a light guiding body and a reflector, and the light guiding body can guide the light of the LED illuminating element disposed on the side thereof to the illuminating surface. The light emitted from the bottom surface of the body is reflected back, and is radiated from the light emitting surface. The bottom surface of the light guiding body has a groove formed therein. The reflecting body is correspondingly provided with a convex shape corresponding to the groove shape of the bottom surface of the light guiding body. 'The protrusion can reflect all the light emitted from the surface of the groove back to the light-emitting body' to increase the light-emitting rate of the light-guide body, so that the lamp can achieve high brightness with only a few LED light-emitting elements. The advantage 'can thus save the manufacturing cost of the lamp. In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the present invention are intended to be included within the scope of the following claims. 8 201000826 [Simplified Schematic Description] FIG. 1 is a perspective view of a lamp provided by an embodiment of the present invention. 2 is a perspective exploded view of the lamp of FIG. 1. 3 is a perspective view of another angle of the reflector of the lamp of FIG. 1. [Main component symbol description] Lamp 100 Light guide 11 Reflector 12 Light-emitting element 30 Light-incident surface 111 Light-emitting surface 112 Bottom surface 113 Groove 115 Dot 114 Body 120 Reflecting surface 121 Raised 122 Circuit board 20 Plug 21