200928221 . 九、發明說明： . 【發明所屬之技術領域】 本發明係關於一種照明系統，尤其涉及一種亮度均勻 之照明系統。 【先前技術】 隨著科學技術的發展及進步，高亮度LED (發光二極 體）已經被廣泛之應用於各種照明系統中，人們將led用 ❹於定向照明裝置中並設計出多種光線彙聚、收集、反射裝 置，然，普通之LED彙聚、收集、反射裝置均採用球面或 者非球面之反射燈罩來進行光線反射、彙集等功能，然而 利用球面或者非球面反射燈罩照射出來之光線其發射角度 不容易控制，其次反射燈罩之製造困難，此外，利用反射 燈罩最大缺點係光線之亮度不均勻，不能實現良好之照明 效果。 【發明内容】 ❹ 有鑒於此，有必要提供一種亮度均勻之照明系統。 一種照明系統，其包括一 LED光源，該照明系統還包 括一實心導光管。該導光管包括一入射面一出射面以及一 位於入射面與出射面之間之反射面，其中所述入射面小於 所述出射面，所述LED光源設置於導光管之入射面一側。 相較先前技術’該照明系統採用之導光管作為其光線 反射及棄集元件’光線於導光管内經過多次反射後射出均 ，之光束，使得其能夠得到均勻之光照度。另，所述導光 管設置成入射面小於出射面之錐形，可修正經過反射面反 200928221 射後之光線角度，從而提高光線之利用率，提高該照明系 統之亮度。 【實施方式】 請一併參閱圖1至圖3，本發明照明系統100包括一 LED光源110以及一導光管120。 所述LED光源110為該照明系統100提供光線。 所述導光管120為一實心錐形導光管，其包括一入射 面122、一出射面124以及位於入射面122及出射面124之 間之反射面126。該導光管120為玻璃或者石英等透光材料 製成。 本實施方式中，所述導光管120之入射面122為一正 方形，該入射面122之尺寸為Sin;所述導光管120之出射面 124之形狀與其入射面122形狀相似，該出射面124之尺寸 為Sout;所述入射面122與出射面124相互平行，該入射面 122與出射面124之間之垂直距離為Hr;所述反射面126形 Q 成於入射面122及出射面124之間，該導光管120包括一 垂直於其入射面122之光軸0,反射面126相對該光轴0之 傾斜角度為4。該導光管120相較空氣為一光密介質，空氣 則為光疏介質，LED光源110射出之光線L由該導光管120 之入射面122射入該導光管120内部，其間，平行於所述 導光管120之光轴0之光線由該導光管120之出射面124 射出，不平行於該導光管120之光軸Ο之光線L將照射於 該導光管120之反射面126上。根據光線折射定律，當光 線從光密介質射向光疏介質時，如果光線之入射角大於臨 7 200928221 . 屆角，則光線會於光密介質與光疏介質之臨界面發生全反 射，因此，照射於導光管120之反射面126上之光線L如 果其入射角大於該導光管120之臨界角時則會於該導光管 120之反射面126之間進行多次全反射之後由出射面124射 出’從而得到亮度均勻之光束。為使得由LED光源110發 射出之光線L得到充分利用，需要將光線l之入射角增大， 使得部分不能發生全反射之光線能滿足發生全反射之條 ©件’從而提高光線L之利用率，增加該照明系統1〇〇之照 明亮度。為達到上述之效果，將導光管120做如下設計便 可： 使得該導光管120之入射面122之尺寸Sin小於其出射 面124之尺寸Scmt’即Sin<Sout;使得位於入射面122與出 射面124之間之反射面126與該導光管120之光轴〇之間 存於一定之夾角&;為了能使該導光管12〇之反射面126能 夠反射更多之光線，因此所述夾角之最佳範圍為5。< & < I5。; φ 此外’所述入射面122與出射面124之間之垂直距離Hr要 大於入射面122之尺寸為最佳’即Hr>sin。所述LED光源 110設置於導光管120之入射面122之一側，當光線L由該 戶、?、明系統100中之導光管120之出射面124射出時，該光 線L與導光管120之光軸〇之間之散射角為，該散射角&之 範圍在兩倍之ΘΛ與五倍之&之間，即。所述導光 官120之反射面126之傾斜角度七可根據所需要之散射角度 &作靈活之變動和選擇。 當所述導光管120之入射面122為一不等邊之任意形 8 200928221 狀如圓形、橢圓形、長方形等形狀時，或者所述入射面122 與所述出射面124不平行時，所述導光管120之反射面126 與該導光管120之光軸Ο之間之傾斜角&滿足5°<&<15°;由 該照明系統100之導光管120之出射面124射出之光線與 該導光管120之光軸Ο之間之散射角&滿足與<& <5&即可。 該照明系統100利用光線之全反射定律採用導光管120 作為其光線反射及彙集元件，光線於導光管120内經過多 次反射後射出均勻之光束，使得其能夠得到均勻之光照 度。此外，所述導光管120還採用入射面122小於出射面 124之錐形，從而使得光線L之入射角相對導光管120之反 射面126之入射角增大，從而提高光線之利用率，提高該 照明系統之亮度。 可以理解，該導光管120之出射面124可以根據使用 者之需求設置成方形、矩形、圓形或橢圓形等任意形狀。 也可將入射面122及出射面124設置為曲面。 綜上所述，本發明符合發明專利要件，爰依法提出專 利申請。惟，以上所述者僅為本發明之較佳實施方式，本 發明之範圍並不以上述實施方式為限，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。 【圖式簡單說明】 圖1係本發明照明系統較佳實施方式之立體圖； 圖2係本發明照明系統之光線出射示意圖； 圖3係本發明照明系統之光路徑示意圖。 9 200928221 【主要元件符號說明】 照明系統 100 LED光源 110 導光管 120 入射面 122 出射面 124 反射面 126 〇 Ο 10200928221 . IX. INSTRUCTIONS: 1. Field of the Invention The present invention relates to an illumination system, and more particularly to an illumination system having uniform brightness. [Prior Art] With the development and advancement of science and technology, high-brightness LEDs (light-emitting diodes) have been widely used in various lighting systems. People use LEDs in directional lighting devices and design a variety of light convergence. Collection and reflection devices. However, ordinary LED convergence, collection, and reflection devices use spherical or aspherical reflectors for light reflection and collection. However, the light emitted by a spherical or aspheric reflector is not emitted. It is easy to control, and the manufacturing of the second reflector is difficult. In addition, the biggest disadvantage of using the reflector is that the brightness of the light is not uniform, and a good illumination effect cannot be achieved. SUMMARY OF THE INVENTION In view of the above, it is necessary to provide an illumination system with uniform brightness. A lighting system includes an LED light source, the lighting system further including a solid light pipe. The light guide tube includes an incident surface, an exit surface, and a reflective surface between the incident surface and the exit surface, wherein the incident surface is smaller than the exit surface, and the LED light source is disposed on an incident surface side of the light guide tube. . Compared with the prior art, the light pipe used in the illumination system as its light reflecting and discarding element's light is reflected by the light in the light pipe after multiple reflections, so that it can obtain uniform illumination. In addition, the light guide tube is arranged such that the incident surface is smaller than the taper of the exit surface, and the angle of the light after the reflection surface is reversed by the reflection surface 200982221 can be corrected, thereby improving the utilization of the light and improving the brightness of the illumination system. [Embodiment] Referring to FIG. 1 to FIG. 3 together, the illumination system 100 of the present invention includes an LED light source 110 and a light guide tube 120. The LED light source 110 provides light to the illumination system 100. The light pipe 120 is a solid tapered light pipe, and includes an incident surface 122, an exit surface 124, and a reflective surface 126 between the incident surface 122 and the exit surface 124. The light guide tube 120 is made of a light transmissive material such as glass or quartz. In this embodiment, the incident surface 122 of the light pipe 120 is a square, and the size of the incident surface 122 is Sin; the shape of the exit surface 124 of the light guide tube 120 is similar to the shape of the incident surface 122, and the exit surface is similar to the shape of the incident surface 122. The size of 124 is Sout; the incident surface 122 and the exit surface 124 are parallel to each other, and the vertical distance between the incident surface 122 and the exit surface 124 is Hr; the reflective surface 126 is formed on the incident surface 122 and the exit surface 124. Between the light pipe 120 and the optical axis 0 perpendicular to the incident surface 122, the reflecting surface 126 has an inclination angle of 4 with respect to the optical axis 0. The light guide tube 120 is a light-tight medium compared with the air, and the air is a light-dissipating medium. The light L emitted from the LED light source 110 is incident on the inside of the light guide tube 120 from the incident surface 122 of the light guide tube 120. The light from the optical axis 0 of the light pipe 120 is emitted from the exit surface 124 of the light guide tube 120, and the light L that is not parallel to the optical axis of the light guide tube 120 will be reflected by the light guide tube 120. On face 126. According to the law of light refraction, when light rays are emitted from the optically dense medium to the light-diffusing medium, if the incident angle of the light is greater than the angle of the light, the light will be totally reflected on the critical plane of the light-tight medium and the light-diffusing medium. The light L that is incident on the reflecting surface 126 of the light guiding tube 120 is subjected to multiple total reflections between the reflecting surfaces 126 of the light guiding tube 120 if the incident angle thereof is greater than the critical angle of the light guiding tube 120. The exit surface 124 emits 'to obtain a beam of uniform brightness. In order to make full use of the light L emitted by the LED light source 110, it is necessary to increase the incident angle of the light l, so that part of the light that cannot be totally reflected can satisfy the total reflection of the article, thereby improving the utilization of the light L. , increase the illumination brightness of the lighting system. In order to achieve the above effect, the light guide tube 120 can be designed as follows: the size Sin of the incident surface 122 of the light guide tube 120 is smaller than the size Scmt of the exit surface 124, that is, Sin<Sout; so that the incident surface 122 is located The angle between the reflecting surface 126 between the exit surface 124 and the optical axis of the light guide tube 120 is at a certain angle &; in order to enable the reflective surface 126 of the light guide tube 12 to reflect more light, The optimum range of the included angle is 5. <&< I5. φ In addition, the vertical distance Hr between the incident surface 122 and the exit surface 124 is greater than the size of the incident surface 122, i.e., Hr>sin. The LED light source 110 is disposed on one side of the incident surface 122 of the light pipe 120. When the light L is emitted from the exit surface 124 of the light guide tube 120 in the household system, the light L and the light guide The scattering angle between the optical axes of the tubes 120 is such that the scattering angle & range is between two and five times & The angle of inclination 7 of the reflecting surface 126 of the light guide 120 can be flexibly varied and selected according to the required scattering angle & When the incident surface 122 of the light guide tube 120 is in the shape of an unequal shape 8 200928221 such as a circle, an ellipse, a rectangle, or the like, or when the incident surface 122 is not parallel to the exit surface 124, The inclination angle between the reflecting surface 126 of the light guiding tube 120 and the optical axis of the light guiding tube 120 satisfies 5° <&< 15 °; the light pipe 120 of the illumination system 100 The scattering angle & between the light emitted from the exit surface 124 and the optical axis of the light guide tube 120 satisfies the <&<5&; The illumination system 100 uses the light-reflecting tube 120 as its light-reflecting and collecting component by using the total reflection law of light, and the light is reflected by the light-receiving tube 120 to emit a uniform beam, so that it can obtain uniform illumination. In addition, the light guide tube 120 further adopts a taper shape of the incident surface 122 smaller than the exit surface 124, so that the incident angle of the light beam L is increased with respect to the incident angle of the reflective surface 126 of the light guide tube 120, thereby improving the utilization of light. Increase the brightness of the lighting system. It can be understood that the exit surface 124 of the light pipe 120 can be set to any shape such as a square, a rectangle, a circle or an ellipse according to the needs of the user. The incident surface 122 and the exit surface 124 may also be set as curved surfaces. In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. However, the above description is only the preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and equivalent modifications or variations made by those skilled in the art in light of the spirit of the present invention are It should be covered by the following patent application. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a preferred embodiment of an illumination system of the present invention; FIG. 2 is a schematic view of light exiting of the illumination system of the present invention; and FIG. 3 is a schematic diagram of a light path of the illumination system of the present invention. 9 200928221 [Description of main component symbols] Lighting system 100 LED light source 110 Light pipe 120 Incident surface 122 Exit surface 124 Reflecting surface 126 〇 Ο 10