201126112 六、發明說明： 【發明所屬之技術領域】 [0001] 本發明涉及一種光學元件及發光模組，特別係指一種透 鏡及應用該透鏡的發光二極體模組。 【先前技術·】 [0002] 作為一種新興的光源，發光二極體憑藉其發光效率高、 體積小、重量輕、環保等優點，已被廣泛地應用到當前 的各個領域當中，大有取代習知光源的趨勢。 [0003] 目前應用發光二極體的燈具的設計難點在於二次光學設 計。目前常見的使用聚光透鏡的聚光型照明燈具，其照 射圖案的亮度不均，出現明暗相間的現象。這種亮度不 均的光照多有使人不適，容易引起人的視覺疲勞。如何 使發光二極體燈具提供視覺舒適的照明效果，直接關係 到其在各照明場合的適用程度，是其應用推廣的很重要的 因素，因此，業者對此問題多有關注。 【發明内容】 [0004] 有鑒於此，有必要提供一種具有良好光照效果的發光二 極體模組及其透鏡。 [0005] —種透鏡，用於導控發光二極體發出的光線，該透鏡包 括一内凹並供發光二極體置入的入射面、與入射面背向 的出射面及連接入射面和出射面的全反射面，該透鏡由 入射面的一端向出射面的一端週邊尺寸逐漸增大，出射 面上設有一位於中部的平滑凸曲面及周圍的平坦面，所 述入射面包括與出射面的凸曲面背向的平滑凸曲面。 099101988 表單編號A0101 第4頁/共18頁 0992003876-0 201126112 [0006] [0007]Ο [0008] Ο [0009] 一種發光二極體模組，包括發光二極體及與之搭配的透 鏡，該透鏡包括一内凹並供發光二極體置入的入射面、 與入射面背向的出射面及連接入射面和出射面的全反射 面，該透鏡由入射面的一端向出射面的一端週邊尺寸逐 漸增大，出射面上設有一位於中部的平滑凸曲面及周圍 的平坦面，所述入射面包括與出射面的凸曲面背向的平 滑凸曲面。 與習知技術相比，本發明發光二極體模組中的透鏡通過 入射面、出射面及全反射面的相互配合，可使發光二極 體的大角度光線偏向光軸方向，使發光二極體的光線收 攏，易於調控其指向性出光性能，產生使人舒適的光照 效果。 實施方式】 請參閱圖1-3，本發明一實施例中的發光二極體模組包括 一發光二極體10及罩設在發光二極體10上的一透鏡20。 發光二極體10具有一光軸I。透鏡20包括位於底側呈内凹 並供發光二極體10置入的入射面、與入射面背向的出射 面，及位於透鏡20外侧並連接入射面和出射面的全反射 面242。出射面上具有一位於中部的平滑凸曲面及周圍的 平坦面。入射面包括與出射面的凸曲面背向平滑凸出的 另一凸曲面。 發光二極體10可通過表面安裝等方式固定在電路板12上 。基於不同的光照需求，可採用不同功率的發光二極體 10。發光二極體10包括基座101、固定於基座101上的發 光二極體晶片102及罩置所述發光二極體晶片102的透明 099101988 表單編號Α0101 第5頁/共18頁 0992003876-0 201126112 封裝體103。 [0010] 透鏡20由光學性能佳的透明材料— 等塑膠’使整個發光二極體模組的 體成型，如PMMA或PC &光致率達到9〇%以上 [0011] [0012] 099101988 透鏡20包括正對發光二極體丨〇的 π . 透鏡部分22及形成於 凸透鏡部分22的外周的導光部分^ 刀d。本實施例中，凸透 鏡邛分22位於透鏡20的中央位罟，γ 99乂甘 置但不排除凸透鏡部分 Μ在其他實施财實施在透鏡㈣料央位l透㈣ 的凸透鏡部分22和導先部分2偶 重合的對稱軸。優觀，將^ ‘n 、稱體’並具有 •兄20罩設在發光二極體10 上時，可使發光二極體1〇的# 部分24的對稱軸重合。认1與凸透鏡部分22、導光 凸透鏡部分22的底面即Α λ以 柞 馮射面的上述另一凸曲面，其 作為透鏡20的第一入射面乃 221。優選地，第一入射面221 馬—非球面。請同時參考 考圖4，圖中的曲線示出了—些實 施例中的第一入射面22 & 從，、底端2 2 2 *也即中央，到頂 3也即周緣的曲率變化。其中，橫坐標表示第一入 Γ221在圖3中的截線上從底端2則頂端223的各個位 底端222的橫坐標為Q，頂端223的橫坐標為丨，縱坐 *表不曲率值。可以;|出，沿著從底端Μ〗到頂端的 向’第-入射面221的曲率先減小再增大，然後又減小 9大1^·個大敢呈^型的變化趨勢，並在底端222 Μ端223之㈣线巾叫《最大曲率 。優選地，第 入射面221的底端222的曲率為0.0242mm_i，頂端223 的曲率為〇.〇382_"，最大曲率為0.0648關]，最小曲 表單蝙珑A0101 頁/共18頁 0992003876 201126112 [0013] ❹ [0014]BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical element and a light-emitting module, and more particularly to a lens and a light-emitting diode module using the same. [Prior Art·] [0002] As an emerging light source, the light-emitting diode has been widely used in various fields due to its high luminous efficiency, small size, light weight, environmental protection, etc. Know the trend of light sources. [0003] At present, the design difficulty of a lamp using a light-emitting diode is a secondary optical design. At present, a concentrating type illuminating lamp using a concentrating lens has an uneven brightness of an illuminating pattern, and a phenomenon of light and dark appears. This uneven illumination is often uncomfortable and can cause visual fatigue. How to make the LED lighting fixture provide visual and comfortable lighting effects, which is directly related to its applicability in various lighting occasions, is an important factor in its application promotion. Therefore, the industry pays more attention to this issue. SUMMARY OF THE INVENTION [0004] In view of the above, it is necessary to provide a light-emitting diode module having a good illumination effect and a lens thereof. [0005] a lens for guiding light emitted by a light-emitting diode, the lens comprising an entrance surface concavely disposed for the light-emitting diode, an exit surface facing away from the incident surface, and a connection incident surface a total reflection surface of the exit surface, wherein the lens gradually increases in size from one end of the incident surface to an end of the exit surface, and the exit surface is provided with a smooth convex surface at the center and a surrounding flat surface, the incident surface including the exit surface A smooth convex surface with a convex surface facing away. 099101988 Form No. A0101 Page 4 / 18 pages 0992003876-0 201126112 [0006] [0007] [0008] [0009] A light emitting diode module comprising a light emitting diode and a lens matched therewith The lens includes an entrance surface concavely disposed for the light-emitting diode, an exit surface facing away from the incident surface, and a total reflection surface connecting the incident surface and the exit surface, the lens passing from one end of the incident surface to one end of the exit surface The size gradually increases, and the exit surface is provided with a smooth convex curved surface in the middle and a surrounding flat surface, and the incident surface includes a smooth convex curved surface facing away from the convex curved surface of the exit surface. Compared with the prior art, the lens of the light-emitting diode module of the present invention can make the large-angle light of the light-emitting diode bias toward the optical axis direction through the mutual cooperation of the incident surface, the exit surface and the total reflection surface, so that the light-emitting diode The light of the polar body is closed, and it is easy to adjust its directional light-emitting performance, resulting in a comfortable lighting effect. 1-3, a light-emitting diode module according to an embodiment of the invention includes a light-emitting diode 10 and a lens 20 disposed on the light-emitting diode 10. The light-emitting diode 10 has an optical axis I. The lens 20 includes an incident surface recessed on the bottom side and into which the light emitting diode 10 is placed, an exit surface facing away from the incident surface, and a total reflection surface 242 located outside the lens 20 and connecting the incident surface and the exit surface. The exit surface has a smooth convex surface in the middle and a flat surface around it. The incident surface includes another convex curved surface that is convexly convex toward the convex curved surface of the exit surface. The light emitting diode 10 can be fixed to the circuit board 12 by surface mounting or the like. Light-emitting diodes 10 of different powers can be used based on different lighting requirements. The light emitting diode 10 includes a base 101, a light emitting diode chip 102 fixed on the base 101, and a transparent 099101988 covering the light emitting diode wafer 102. Form No. 1010101 Page 5 of 18 pages 0992003876-0 201126112 Package 103. [0010] The lens 20 is formed by a transparent material of good optical properties, such as plastic, to form a body of the entire light-emitting diode module, such as PMMA or PC & photo-luminescence ratio of more than 9% [0011] [0012] 099101988 lens 20 includes a π. lens portion 22 facing the light-emitting diode 丨〇 and a light guiding portion knives d formed on the outer circumference of the convex lens portion 22. In this embodiment, the convex lens segment 22 is located at the center of the lens 20, and the γ 99 is placed but does not exclude the convex lens portion. In other embodiments, the convex lens portion 22 and the leading portion of the lens (four) material center l (4) are implemented. 2 symmetry axis of even coincidence. It is preferable that the symmetry axes of the # portion 24 of the light-emitting diode 1 重 can be overlapped when ^ ‘n , 称 称 、 and 兄 20 are placed on the light-emitting diode 10 . The first convex curved surface of the lens 20, which is the bottom surface of the convex lens portion 22 and the light guiding convex lens portion 22, is Αλ, which is the first incident surface of the lens 20. Preferably, the first incident surface 221 is a horse-aspherical surface. Referring also to Figure 4, the graph shows the curvature of the first incident surface 22 & the bottom end 2 2 2 *, i.e., the center, to the top 3, i.e., the circumference. Wherein, the abscissa indicates that the abscissa of the first port 221 in FIG. 3 has the abscissa of the bottom end 222 of the top end 223 from the bottom end 2, and the abscissa of the top end 223 is 丨, and the vertical sitting * indicates the curvature value. . Yes; | out, along the bottom end Μ 〗 〖 to the top of the 'first-incident surface 221 curvature first reduced and then increased, and then reduced 9 large 1 ^ · a dare to form a change trend, And at the bottom end 222, the end of the 223 (four) line towel is called "maximum curvature. Preferably, the curvature of the bottom end 222 of the first incident surface 221 is 0.0242 mm_i, the curvature of the top end 223 is 〇.〇382_", the maximum curvature is 0.0648 OFF], the minimum curved form 珑A0101 page/total 18 pages 0992003876 201126112 [0013 ] ❹ [0014]
率為0.0057ΠΠΙΓ1，最小曲率出現在底端222與中點處之 間，並在第一入射面221的截線的總長度的大致五分之一 處。 凸透鏡部分22的頂面即為出射面的上述凸出面，其作為 透鏡20的第一出射面224。優選地，第一出射面224為一 非球面。請同時參考圖5，圖中的曲線示出了一些實施例 中的第一出射面224從其頂端226，也即中央，到底端 225,也即周緣的曲率變化。其中，橫坐標表示第一出射 面224在圖3中的截線上從頂端226到底端225的各個位置 ，頂端226的橫坐標為0，底端225的橫坐標為1，縱坐標 表示曲率值。可以看出，沿著從頂端226到底端225的方 向，第一出射面224的曲率先逐漸增大然後逐漸減小，再 逐漸增大，形成一個大致呈N型的變化趨勢。頂端226處 的曲率最小，優選為0. 0087mm_1，底端225處的曲率最 大，優選為0. 1959Π1ΠΓ1。 第一入射面221在水平面上的投影的直徑小於第一出射面 224在水平面上的投影的直徑。第一出射面224的底端 225所在的水平面位於第一入射面221的底端222與頂端 2 2 3所在的水平面之間。 [0015] 導光部分24的外形整體大致呈一倒置的圓臺狀，即圓臺 的大端朝上，小端朝下。導光部分24中空並設凸透鏡部 分22於其内。導光部分24的底部、凸透鏡部分22的下方 形成一容置發光二極體10的容置空間25。導光部分24底 部的内側面優選地為一内圓柱面，其為供發光二極體10 發出的光線入射的第二入射面241。第二入射面241及第 099101988 表單編號A0101 第7頁/共18頁 0992003876-0 201126112 一入射面221共同構成透鏡20的入射面。第二入射面241 與第一入射面221相連，容置空間25即由第二入射面241 與第一入射面221共同圍設而成。 [0016] [0017] 導光部分24的外側面即為全反射面242，該全反射面242 為一錐面。導光部分24的頂部即為前述出射面的平坦面 ’呈圓環狀，其作為透鏡2 0的第二出射面243。該第二出 射面243環繞第一出射面224，第一出射面224的頂端226 高於第二出射面243。第一、第二出射面224、243及第 一入射面221的相互位置關係如此設置，可使透鏡20的結 構更為緊凑，減小透鏡20的體積。第二出射面243與第一 出射面224共同構成透鏡20的出射面。第一出射面224與 第二出射面243之間設有一環形槽23 »另外，在導光部分 24的頂部内侧還有一將第二出射面243與第一出射面224 相連的豎直的圓柱面（未標號）。由於僅有少部分光線 經過凸透鏡部分22的第一出射面224後再進入導光部分24 的該圓柱面，因此該圓柱面對整Μ發光二極體模組的出 光效果影響小。 發光二極體10發出的光線穿設透鏡20後，95%的光線集中 在偏離光轴I的22. 5度範圍内，即光線經過透鏡20後的出 光角大致為45度。光線的偏離角度在大約15-20度時’其 光強開始急劇下降。自發光二極體10以小角度（小於或等 於40度）出射的光線（如圖3中的光線a)經第一入射面221 和第一出射面224兩次折射後，以更加偏向光軸1的角度 射出。將第一入射面221及第一出射面224設置成具有上 述變化趨勢的曲率的曲面，可將比較大的出光角（例如 099101988 表單編號A0101 第8頁/共18頁 0992003876-0 201126112 40度）的光線更有效地偏向光軸I導此，借此提高出光约 勻度。自發光二極體1〇以大角度（大於40度）出射的光線 (如圖3中的光線b)先經第二入射面241折射，然後經全 反射面242反射’再經第二出射面243折射，也以更加偏 向光軸I的角度射出。 [0018] Ο 、 [0019] 經過電腦軟體測試後’上述發光二極體模組形成的照射 區域内其照度分佈從中心到週邊逐漸減小，均勻變化， 其均勻度得到有效的提升。與傳統的發光二極體模組形 成的照射區域相比’该照射區域.不存在明暗相間的光照 ，因而產生了更適合照明的光照效果。 本發明上述實施例中的大角度及小角度是以40度為界限 進行劃分的，應當指出，該40度不應理解為是對大角度 及小角度的範圍所作出的限定，其僅是一個具體的實施 方式。實際上，在20〜45度範圍内的任何角度都可作為 劃分大角度及小角度的界限。 [0020] Ο 另，本文所稱曲率均是指以圖3的截面為基礎進行測算的 ，即是說，上述各曲率均是指圖3的截面内的曲率。可以 理解地，各曲率數值均可以為導光效果而做出合理性調 整。 [0021] 上述實施例中的發光二極體模組其透鏡20可根據電路板 12上的發光二極體1〇的數量和排布方式作不同變更，例 如，可以排列成矩陣、圓形、線性等不同狀態。為方便 定位及固定透鏡20，可於導光部分24的底部凸設一對固 定腳26，該固定腳26可卡設於發光二極體10的週邊。此 099101988 表單編號A0101 第9頁/共18頁 0992003876-0 201126112 外，還可於導光部分24的頂部外側緣環設一固定槽27， 用於將壓板等元件設置在透鏡20的頂部。 [0022] 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例，舉凡 熟悉本案技藝之人士，在爰依本發明精神所作之等效修 飾或變化，皆應涵蓋於以下之申請專利範圍内。 【圖式簡單說明】 [0023] 圖1為本發明一實施例的發光二極體模組中的透鏡的立體 示意圖。 [0024] 圖2為圖1中的透鏡的另一視角的立體示意圖。 [0025] 圖3為本發明一實施例的發光二極體模組的剖示示意圖。 [0026] 圖4為本發明一實施例中的透鏡的第一入射面的曲率變化 圖。 [0027] 圖5為本發明一實施例中的透鏡的第一出射面的曲率變化 圖。 【主要元件符號說明】 [0028] 發光二極體：10 [0029] 基座：101 [0030] 發光二極體晶片：102 [0031] 封裝體：103 [0032] 電路板：12 [0033] 透鏡：20 099101988 表單編號A0101 第10頁/共18頁 0992003876-0 201126112 [0034] 凸透鏡部分：22 [0035] 第一入射面：221 [0036] 第一出射面：224 [0037] 底端：222、225 [0038] 頂端：223、226 [0039] 環形槽：23 [0040] 導光部分：24 〇 [0041] 第二入射面：241 [0042] 全反射面：242 [0043] 第二出射面：243 [0044] 容置空間：25 [0045] 固定腳：26 [0046] Ο m ojk. · ο η 凹之彳罝· 6丨 099101988 表單編號Α0101 第11頁/共18頁 0992003876-0The rate is 0.0057 ΠΠΙΓ 1, and the minimum curvature occurs between the bottom end 222 and the midpoint and is approximately one fifth of the total length of the section line of the first incident surface 221. The top surface of the convex lens portion 22 is the above-mentioned convex surface of the exit surface, which serves as the first exit surface 224 of the lens 20. Preferably, the first exit surface 224 is an aspherical surface. Referring also to Figure 5, the graph shows the curvature of the first exit surface 224 in some embodiments from its top end 226, i.e., the center, bottom end 225, i.e., the circumference. Here, the abscissa indicates each position of the first exit surface 224 from the top end 226 to the bottom end 225 on the section line in Fig. 3. The abscissa of the top end 226 is 0, the abscissa of the bottom end 225 is 1, and the ordinate indicates the curvature value. It can be seen that along the direction from the top end 226 to the bottom end 225, the curvature of the first exit surface 224 first increases and then gradually decreases, and then gradually increases to form a substantially N-shaped change tendency. The first portion 226 has the smallest curvature, preferably 0. 0087 mm_1, and the curvature at the bottom end 225 is the largest, preferably 0. 1959Π1ΠΓ1. The diameter of the projection of the first incident surface 221 on the horizontal plane is smaller than the diameter of the projection of the first exit surface 224 on the horizontal plane. The horizontal plane at which the bottom end 225 of the first exit surface 224 is located is located between the bottom end 222 of the first incident surface 221 and the horizontal plane at which the tip end 2 2 3 is located. [0015] The overall shape of the light guiding portion 24 is substantially in the shape of an inverted truncated cone, that is, the large end of the truncated cone faces upward and the small end faces downward. The light guiding portion 24 is hollow and has a convex lens portion 22 therein. An accommodating space 25 for accommodating the light-emitting diode 10 is formed under the bottom of the light guiding portion 24 and below the convex lens portion 22. The inner side surface of the bottom portion of the light guiding portion 24 is preferably an inner cylindrical surface which is a second incident surface 241 through which light emitted from the light emitting diode 10 is incident. Second incident surface 241 and 099101988 Form No. A0101 Page 7 of 18 0992003876-0 201126112 An incident surface 221 together constitutes the incident surface of the lens 20. The second incident surface 241 is connected to the first incident surface 221, and the accommodating space 25 is surrounded by the second incident surface 241 and the first incident surface 221. [0017] The outer side surface of the light guiding portion 24 is a total reflection surface 242, and the total reflection surface 242 is a tapered surface. The top surface of the light guiding portion 24 is an annular surface of the above-mentioned exit surface, which is an annular shape, and serves as a second exit surface 243 of the lens 20. The second exit surface 243 surrounds the first exit surface 224, and the top end 226 of the first exit surface 224 is higher than the second exit surface 243. The mutual positional relationship of the first and second exit faces 224, 243 and the first incident face 221 is such that the structure of the lens 20 can be made more compact, reducing the volume of the lens 20. The second exit surface 243 and the first exit surface 224 together form the exit surface of the lens 20. An annular groove 23 is disposed between the first exit surface 224 and the second exit surface 243. In addition, a vertical cylindrical surface connecting the second exit surface 243 and the first exit surface 224 is further disposed inside the top of the light guiding portion 24. (not numbered). Since only a small portion of the light passes through the first exit surface 224 of the convex lens portion 22 and then enters the cylindrical surface of the light guiding portion 24, the effect of the cylindrical surface on the light-emitting effect of the entire LED module is small. After the light from the light-emitting diode 10 passes through the lens 20, 95% of the light is concentrated in the range of 22.5 degrees from the optical axis I, that is, the light exiting the lens 20 is approximately 45 degrees. When the angle of deviation of the light is about 15-20 degrees, its light intensity begins to drop sharply. The light emitted from the self-luminous diode 10 at a small angle (less than or equal to 40 degrees) (such as the light a in FIG. 3) is twice refracted by the first incident surface 221 and the first exit surface 224 to be more deflected toward the optical axis. The angle of 1 is shot. The first incident surface 221 and the first exit surface 224 are disposed as curved surfaces having the curvature of the above-described changing trend, and a relatively large exit angle can be obtained (for example, 099101988 Form No. A0101, page 8 / 18 pages, 0992003876-0 201126112 40 degrees) The light is more effectively deflected toward the optical axis I, thereby increasing the light uniformity. The light emitted from the self-luminous diode 1 at a large angle (greater than 40 degrees) (such as the light b in FIG. 3) is first refracted by the second incident surface 241 and then reflected by the total reflection surface 242' and then passed through the second exit surface. The 243 refraction is also emitted at an angle that is more biased toward the optical axis I. [0018] [0019] After the computer software test, the illuminance distribution in the illumination region formed by the above-mentioned light-emitting diode module gradually decreases from the center to the periphery, and changes uniformly, and the uniformity thereof is effectively improved. Compared with the illumination area formed by the conventional light-emitting diode module, the illumination area does not have light and dark illumination, thus producing a lighting effect more suitable for illumination. The large angle and the small angle in the above embodiment of the present invention are divided by 40 degrees. It should be noted that the 40 degree should not be understood as a limitation on the range of large angles and small angles, which is only one. Specific embodiment. In fact, any angle in the range of 20 to 45 degrees can be used as a boundary for dividing large angles and small angles. [0020] Further, the curvature referred to herein refers to the measurement based on the section of FIG. 3, that is, each of the above curvatures refers to the curvature in the section of FIG. It can be understood that each curvature value can be rationally adjusted for the light guiding effect. [0021] The lens 20 of the LED module of the above embodiment may be differently changed according to the number and arrangement of the LEDs 1 on the circuit board 12, for example, may be arranged in a matrix, a circle, or the like. Linear and other different states. In order to facilitate positioning and fixing the lens 20, a pair of fixing legs 26 may be protruded from the bottom of the light guiding portion 24, and the fixing legs 26 may be disposed at the periphery of the light emitting diode 10. This 099101988 Form No. A0101 Page 9 of 18 0992003876-0 201126112 In addition, a fixing groove 27 may be provided on the top outer edge of the light guiding portion 24 for arranging components such as a pressure plate on the top of the lens 20. [0022] 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 equivalent modifications or variations made by those skilled in the art of the present invention should be included in the following claims. BRIEF DESCRIPTION OF THE DRAWINGS [0023] FIG. 1 is a perspective view of a lens in a light emitting diode module according to an embodiment of the present invention. 2 is a perspective view of another perspective of the lens of FIG. 1. 3 is a schematic cross-sectional view of a light emitting diode module according to an embodiment of the invention. 4 is a graph showing changes in curvature of a first incident surface of a lens according to an embodiment of the present invention. 5 is a graph showing changes in curvature of a first exit surface of a lens according to an embodiment of the present invention. [Main Component Symbol Description] [0028] Light Emitting Diode: 10 [0029] Base: 101 [0030] Light Emitting Diode Wafer: 102 [0031] Package: 103 [0032] Circuit Board: 12 [0033] Lens :20 099101988 Form No. A0101 Page 10 of 18 0992003876-0 201126112 [0034] Convex lens portion: 22 [0035] First incident surface: 221 [0036] First exit surface: 224 [0037] Bottom: 222, 225 [0038] Top: 223, 226 [0039] Annular groove: 23 [0040] Light guiding portion: 24 〇 [0041] Second incident surface: 241 [0042] Total reflecting surface: 242 [0043] Second exit surface: 243 [0044] accommodating space: 25 [0045] Fixed foot: 26 [0046] Ο m ojk. · ο η concave 彳罝 · 6丨099101988 Form number Α 0101 Page 11 / 18 pages 0992003876-0