201124753 六、發明說明： 【發明所屬之技術領域】 [0001] 本發明涉及一種光源模組，特別涉及一種發光二極體模 組及該發光二極體模組採用之透鏡。 [0002] 【先前技術】 作為一種新興之光源，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 之各個領域當中，有取代傳統光源之趨勢。 [0003] 目前應用發光二極體之燈具之設計難點在於二次光學設 計。目前使用聚光透鏡之聚光型照明燈具，其照射圖案 之邊緣極易出現亮圈或邊緣發黃之現象。該種亮圈或邊 緣發黃之光照多有使人不適，容易引起人之視覺疲勞。. 如何使發光二極體燈具提供視覺舒適之照明效果，直接 關係到其在各照明場合之適用程度，乃其應用推廣之重要 因素，因此，業者對此問題多有關注。 〇 [0004] 【發明内容】 有審於此，有必要提供一種具有良好光照效果之發光二 極體模組及其透鏡。 [0005] 一種透鏡，其具有一供光線入射之入光面及一供光線出 射之出光面，該入光面内凹呈非球面，該出光面外凸呈 球面，出光面和入光面均為中心對稱體，且具有重合之 中心軸。 [0006] 一種發光二極體模組，包括電路板，置於電路板上之發 光二極體，及罩設在發光二極體上之透鏡，該透鏡具有 099100503 表單編號A0101 第3頁/共13頁 0992001085-0 201124753 一供發光二極體發出之光線入射之入光面及一供光線出 射之出光面，該入光面内凹呈非球面，該出光面外凸呈 球面，出光面和入光面均為中心對稱體，且具有重合之 中心軸。 [0007] 與習知技術相比，本發明將透鏡之入光面設置成非球面 ，將出光面設置成球面，並且出光面和入光面分別沿共 同之中心軸呈中心對稱，可使經過透鏡之光線形成邊緣 沒有亮圈之圓形光斑，其光照效果使人舒適。 【實施方式】 [0008] 請一併參考圖1至圖3，本發明一實施例中之發光二極體 模組包括一電路板10，設置於電路板10上之一發光二極 體20及貼設在電路板10上並罩蓋發光二極體20之一透鏡 30。該透鏡30具有一供發光二極體20發出之光線入射之 入光面303及一供光線出射之出光面307。入光面303内 凹呈非球面，並具有一第一中心轴I。出光面307外凸為 球面，並具有一第二光軸11，該第二中心軸11與第一中 心轴I重合，出光面307和入光面303均沿該中心轴I，II 呈中心對稱。 [0009] 發光二極體20可用不同方法設置於電路板10上，例如焊 接或者表面黏貼等。基於不同之光照需求，可採用不同 功率之發光二極體20。發光二極體20外部具有自身封裝 體，發光二極體20内之發光晶片發出之光經自身之封裝 體後發射出來。發光二極體20具有一光軸III。優選地， 將透鏡30罩設在發光二極體20上時，可使發光二極體20 之光軸III與透鏡30之中心軸I，II重合。 099100503 表單編號A0101 第4頁/共13頁 0992001085-0 201124753 [0010] ο [0011] 透鏡30由光學性能佳之透明材料一體成型，如ΡΜΜΑ或PC 等塑膠，使整個發光二極體模組之出光效率達到90%以上 。該透鏡30包括一基座31及凸設於基座31上之一導光部 33。基座31大致呈圓塊狀，其底部中央形成一凹槽310。 基座31之兩側分別延伸出一大致呈方塊狀之固定腳312。 固定腳31 2與基座31之底部皆貼設在電路板10上。固定腳 312之設置使得透鏡30與電路板10之接觸面積較大，從而 使透鏡30之安裝更為穩固。另外，固定腳312還可起到引 導安裝透鏡30之方向之作用。每一固定腳312之底部進一 步開設有一固定槽314，該固定槽314可容置膠水等黏性 物質，利用該粘性物質將透鏡30固定在電路板10上。 ο 導光部33設置在基座31之凹槽310之正上方。導光部33 之底部内凹，並與凹槽310連通，從而形成一容置發光二 極體20之容置空間320。導光部33内凹之底部形成一呈非 球面之内表面，即内表面各處之曲率各不相同。該内表 面即為發光二極體20產生之光線入射透鏡30之入光面303 。導光部33之頂部外凸形成一呈球面之外表面，該外表 面即為光線穿過透鏡30之出光面307。出光面307和入光 面3 0 3均是沿中心軸I ( 11 )對稱之中心對稱體。入光面 303之頂部304之曲率最大，底部305之曲率最小，且入 光面303之曲率由頂部304向底部305逐漸變小。優選地 ，入光面303之頂部304之曲率為0. 26mm_1，底部305之 曲率為0.15_ 1。出光面307之曲率為0.215mm 1。 請同時參考圖4,圖中示出了上述實施例中之發光二極體 模組之配光曲線。其中橫坐標表示光線偏離光軸111之角 099100503 表單編號A0101 第5頁/共13頁 0992001085-0 [0012] 201124753 度，縱坐標表示光線之強度。縱坐標之數值代表之絕對 光強會因發光二極體20之數量（功率）變化而變化，因 此其數值並未在圖中標出。從圖4可知，發光二極體20發 出之光線穿設透鏡30後，95%之光線集中在偏離光轴III 之30度範圍内，即光線經過透鏡30後之出光角大致為60 度。光線之偏離角度在大約20-25度時，其光強開始急劇 下降。在不同之實施例中，還可以通過改變透鏡30之出 光面307和入光面303之曲率，使光線集中在偏離光軸 III之不同角度範圍内，例如15度，30度等。 [0013] 經過軟體測試後，上述發光二極體模組形成之圓形照射 區域内其照度分佈從圓心到週邊逐漸減小。與傳統之發 光二極體模組形成之照射區域相比，該圓形照射區域外 部邊緣無亮圈，因而產生了更適合照明之光照效果。 [0014] 上述實施例中之發光二極體模組其透鏡30可根據電路板 10上之發光二極體20之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。 [0015] 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】 [0016] 圖1是本發明一實施例之發光二極體模組中之透鏡之立體 示意圖。 [0017] 圖2是圖1中之透鏡之另一視角之立體示意圖。 099100503 表單編號A0101 第6頁/共13頁 0992001085-0 201124753 [0018] 圖3是本發明一實施例之發光二極體模組之剖示示意圖。 [0019] 圖4示出了圖3之發光二極體模組在工作時之配光曲線。 ' [0020] 【主要元件符號說明】 電路板10 [0021] 發光二極體20 [0022] 透鏡30 [0023] 入光面3 0 3 〇 [0024] 頂部304 [0025] 底部305 [0026] 出光面3 0 7 [0027] 基座31 [0028] 凹槽310 [0029] 固定腳312 Ο [0030] 固定槽314 [0031] 容置空間320 [0032] 導光部33 099100503 表單編號A0101 第7頁/共13頁 0992001085-0BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light source module, and more particularly to a light emitting diode module and a lens used in the light emitting diode module. [0002] As a new light source, the light-emitting diode has been widely used in various fields in the past due to its high luminous efficiency, small size, light weight, environmental protection, etc., and has replaced the traditional light source. trend. [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 condensing lens is highly susceptible to bright circles or yellow edges at the edges of the illuminating pattern. The bright circles or the yellowish edges of the edges are uncomfortable and cause visual fatigue. How to make the LED lighting fixtures provide visual comfort lighting, which is directly related to its applicability in various lighting occasions, and is an important factor in its application promotion. Therefore, the industry pays more attention to this issue. [0004] [Draft] In view of this, it is necessary to provide a light-emitting diode module having a good illumination effect and a lens thereof. [0005] A lens having a light incident surface into which light is incident and a light exiting surface for emitting light, wherein the light incident surface is concavely aspherical, and the light emitting surface is convexly convex, and the light emitting surface and the light incident surface are both It is a central symmetry body and has a central axis of coincidence. [0006] A light emitting diode module comprising a circuit board, a light emitting diode disposed on the circuit board, and a lens disposed on the light emitting diode, the lens having 099100503 Form No. A0101 Page 3 / Total 13 pages 0992001085-0 201124753 A light-emitting surface for the light emitted by the light-emitting diode and a light-emitting surface for the light to be emitted, the concave surface of the light-incident surface is aspherical, the light-emitting surface is convex and convex, and the light-emitting surface is convex The entrance faces are all centrally symmetric and have a central axis of coincidence. Compared with the prior art, the present invention sets the light-incident surface of the lens to be aspherical, and sets the light-emitting surface to a spherical surface, and the light-emitting surface and the light-incident surface are respectively symmetric along a common central axis, so that the The light of the lens forms a circular spot with no bright circles at the edges, and the illumination effect is comfortable. [Embodiment] Referring to FIG. 1 to FIG. 3, an LED module according to an embodiment of the present invention includes a circuit board 10, and a light-emitting diode 20 disposed on the circuit board 10 and It is attached to the circuit board 10 and covers one lens 30 of the light-emitting diode 20. The lens 30 has a light incident surface 303 through which light emitted from the light emitting diode 20 is incident and a light exit surface 307 through which light is emitted. The light incident surface 303 is concave in aspherical shape and has a first central axis I. The light-emitting surface 307 is convexly spherical and has a second optical axis 11 which coincides with the first central axis I. The light-emitting surface 307 and the light-incident surface 303 are centrally symmetric along the central axis I, II. . [0009] The light emitting diode 20 can be disposed on the circuit board 10 in different ways, such as soldering or surface bonding. Light-emitting diodes 20 of different powers can be used based on different lighting requirements. The light-emitting diode 20 has its own package on the outside, and the light emitted from the light-emitting chip in the light-emitting diode 20 is emitted through its own package. The light emitting diode 20 has an optical axis III. Preferably, when the lens 30 is placed on the light-emitting diode 20, the optical axis III of the light-emitting diode 20 can be overlapped with the central axes I, II of the lens 30. 099100503 Form No. A0101 Page 4 / Total 13 Pages 0992001085-0 201124753 [0011] The lens 30 is integrally formed of a transparent material with good optical properties, such as plastic such as ΡΜΜΑ or PC, so that the entire light emitting diode module emits light. The efficiency is over 90%. The lens 30 includes a base 31 and a light guiding portion 33 protruding from the base 31. The base 31 has a substantially circular block shape with a recess 310 formed in the center of the bottom. A substantially square-shaped fixing leg 312 extends from each side of the base 31. The fixing legs 31 2 and the bottom of the base 31 are attached to the circuit board 10. The arrangement of the fixed legs 312 provides a larger contact area between the lens 30 and the circuit board 10, thereby making the mounting of the lens 30 more stable. In addition, the fixed feet 312 can also function to guide the direction in which the lens 30 is mounted. A fixing groove 314 is further formed in the bottom of each fixing leg 312. The fixing groove 314 can accommodate adhesive substances such as glue, and the lens 30 is fixed on the circuit board 10 by the adhesive material. Ø The light guiding portion 33 is disposed directly above the recess 310 of the base 31. The bottom of the light guiding portion 33 is recessed and communicates with the recess 310 to form an accommodating space 320 for accommodating the light emitting diode 20. The concave bottom portion of the light guiding portion 33 forms an inner surface which is aspherical, that is, the curvature of the inner surface is different. The inner surface is the light incident surface 303 of the light incident lens 30 generated by the light emitting diode 20. The top of the light guiding portion 33 is convexly formed to form a spherical outer surface, and the outer surface is light passing through the light emitting surface 307 of the lens 30. Both the light exiting surface 307 and the light incident surface 3 0 3 are symmetrical bodies symmetrical along the central axis I ( 11 ). The curvature of the top portion 304 of the light incident surface 303 is the largest, the curvature of the bottom portion 305 is the smallest, and the curvature of the light incident surface 303 is gradually reduced from the top portion 304 to the bottom portion 305. Preferably, the curvature of the top portion 304 of the light incident surface 303 is 0.26 mm_1, and the curvature of the bottom portion 305 is 0.15_1. The curvature of the light exit surface 307 is 0.215 mm 1. Please refer to FIG. 4 at the same time, which shows the light distribution curve of the LED module in the above embodiment. The abscissa indicates the angle of the light from the optical axis 111. 099100503 Form No. A0101 Page 5 of 13 0992001085-0 [0012] 201124753 degrees, the ordinate indicates the intensity of the light. The value of the ordinate represents the absolute intensity of the light due to the change in the number (power) of the light-emitting diode 20, so its value is not shown in the figure. As can be seen from Fig. 4, after the light emitted from the light-emitting diode 20 passes through the lens 30, 95% of the light is concentrated within 30 degrees of the optical axis III, that is, the light exiting the lens 30 is approximately 60 degrees. When the angle of deviation of the light is about 20-25 degrees, its light intensity begins to drop sharply. In various embodiments, the light may be concentrated in different angular ranges from the optical axis III by varying the curvature of the light exiting surface 307 and the light incident surface 303 of the lens 30, such as 15 degrees, 30 degrees, and the like. [0013] After the soft body test, the illuminance distribution in the circular illumination area formed by the light-emitting diode module gradually decreases from the center of the circle to the periphery. Compared with the illuminated area formed by the conventional light-emitting diode module, the outer edge of the circular illumination area has no bright circles, thus producing a lighting effect more suitable for illumination. [0014] The lens of the LED module in the above embodiment may be different according to the number and arrangement of the LEDs 20 on the circuit board 10. For example, the matrix 30 may be arranged in a matrix, a circle, or a linear line. Wait for different states. [0015] 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 [0016] 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. 099100503 Form No. A0101 Page 6 of 13 0992001085-0 201124753 [0018] FIG. 3 is a schematic cross-sectional view of a light emitting diode module according to an embodiment of the present invention. [0019] FIG. 4 is a view showing a light distribution curve of the light-emitting diode module of FIG. 3 during operation. [0020] [Major component symbol description] Circuit board 10 [0021] Light-emitting diode 20 [0022] Lens 30 [0023] Light-incident surface 3 0 3 〇 [0024] Top 304 [0025] Bottom 305 [0026] Light-emitting Face 3 0 7 [0027] Base 31 [0028] Groove 310 [0029] Fixing foot 312 Ο [0030] Fixing groove 314 [0031] accommodating space 320 [0032] Light guiding portion 33 099100503 Form number A0101 Page 7 / Total 13 pages 0992001085-0