201200799 六、發明說明： 【發明所屬之技術領域】 本發明是有關於一種透鏡，特別是指一種LED透鏡。 【先前技術】 & 發光二極體由於具備發光效率高、壽命長、低耗電量 等優點，近年來已經逐漸取代傳統燈泡而成為新一代的發 光元件首選，除了照明農置或顯示器的背光模組等等，就 連設置面積廣泛而需求量極大的路燈，也逐漸以發光二極 體取代傳統燈泡。 一般路燈在進行照明時，其照明區域需要能涵蓋整個 道路的寬度，因此，路燈較佳的照明區域是要能呈矩形， 以便於能涵蓋整個道路的寬度。 【發明内容】 因此，本發明之目的，即在提供一種能使光源的照明 區域呈矩形的LED透鏡。 本發明LED透鏡用以罩覆一 LED發光源’該LED透 鏡包含一本體、一出光部以及一入光凹部。該本體為透光 材質。該出光部形成於該本體並且具有一呈自由曲面的出 光表面，且該出光表面可供沿一 X軸方向區隔為二個向外 凸弧狀表面區域與連接於兩個該向外凸弧狀表面區域之間 的向内凹弧狀表面區域，該向内凹派狀表面區域沿一 γ軸 方向與一 Z轴方向的最小寬度小於該向外凸弧狀表面區域 沿該Y轴方向與該Z軸方向的最大寬度，該z軸方向垂直 於該X轴方向與該γ軸方向所構成的平面。該入光凹部呈 201200799 凹陷結構形成於該本體相反於該出光部所在的一侧面而可 供容納該LED發光源，且該入光凹部具有一入光表面該 入光表面位於該X軸方向上的兩側區域相遠離地往下斜向 延伸’且§亥入光凹部沿該X轴的寬度小於該本體沿該X轴 的寬度的一半。 本發明之功效在於，藉由入光表面的設計以及出光表 面的自由曲面設計，使得LED發光源所發射的光線能呈現 矩形光形以符合路燈的照明需求。 【實施方式】 有關本發明之前述及其他技術内容、特點與功效，在 以下配合參考圖式之一個較佳實施例的詳細說明中，將可 清楚的呈現。 參閱圖1與圖2，本發明LED透鏡的一個較佳實施例 為塑膠材質一體成型製成（如射出成型），該LED透鏡i包 含一透光材質的本體10、一出光部n、一入光凹部12以及 至少一定位凸柱13。 先行說明的是，以下所指的X軸方向與γ軸方向相垂 直並且界定出一平面，而z軸方向垂直χ軸與¥軸界定出 的平面。 參閱圖2至圖4，本實施例的本體1〇概呈一縱向剖切 的半邊萌藍外型並且具有一頂面與一底面1〇1，定位凸柱 13由本體1〇的底面112往下凸出而具有定位功能。出光部 11形成在本體1〇頂面並且具有一出光表面lu，出光表面 111為一概呈葫蘆形的自由曲面而中間局部段呈頸縮，更詳 201200799 細的說，沿本體10的x軸方向可將該出光表面Ul區隔為 兩向外凸弧狀表面區域113以及一連接於兩向外凸弧狀表面 區域113之間的向内凹弧狀表面區域114，兩個向外凸弧狀 表面區域113是大致呈球狀曲面，而向内凹弧狀表面區域 114則是位在兩球狀曲面之間的凹陷曲面，且向内凹弧狀表 面區域114沿X軸方向的寬度A2小於每一向外凸弧狀表面 區域113沿X軸方向的寬度A1，向内凹弧狀表面區域ιΐ4 在本體10的Y軸方向的最小寬度W1小於兩向外凸弧狀表 面區域113在γ軸方向的最大寬度W2，向内凹弧狀表面區 域Π4在本體10的一 z軸方向的最小高度u也小於兩向 外凸弧狀表面區域113在z軸方向的最大高度L2,且該出 光表面111不論是在X軸方向或γ軸方向都是呈軸對稱的 結構。 參閱圖2、圖6，入光凹部12形成在本體1〇相反於出 光部11所在的一側面並且對應於向内凹弧狀表面區域114 的正下方，在本實施例中，入光凹部12形成在本體1〇的 底面ιοί並且包括一入光表面121以及一環狀内表面122， 在本實施例中，入光凹部12呈由本體1〇的底面1〇1往上 凹形成的凹陷結構而位在出光表面丨丨丨下方入光表面 121位在X軸方向上的兩側區域是彼此相遠離地往下斜向延 伸而呈酒桶形凹陷曲面，換句話說，如圖6所示，在本體 10的X軸方向的縱向斷面中，入光表面121的輪廓是呈兩 端朝下的弧形。環狀内纟® 122是由入光表自121的外緣 彺下延伸，且入光表面121與環狀内表面丨22圍繞界定出 201200799 一凹陷空間123而可供[ED發光源l〇3 (例如封裝的發光 二極體或發光晶粒）容納於内而罩覆於該發光源1〇3，且在 本實施例中，入光凹部12沿X軸方向的寬度A4小於整個 LED透鏡1的本體10沿χ軸方向的寬度A5的—半。 如圖5至圖7，當LED發光源1〇3所發射的光線由入 光表面121進入本體1〇並且由出光表面lu射出時，藉由 入光表面121與出光表面丨丨丨的折射，便可形成在光軸兩側 均為60度的出光角，且藉由入光表面121的曲面設計，使 得當光線通過入光表面121時，是被往本體1〇的χ軸方向 折射，除此之外，藉由讓出光部u的向内凹弧狀表面區域 114呈頸縮凹陷狀，避免光線過度集中於向内凹弧狀表面區 域114,便能讓光線均勻分布於向内凹弧狀表面區域ιΐ4與 兩向外凸弧狀表面區域113而呈現如圖8的光形圖所示的矩 形光形。 綜上所述，本發明LED透鏡丨藉由入光表面121與出 光表面ill的結構設計，使得LED發光源1〇3所發射的光 線能呈現矩形光形以符合路燈的照明需求，故確實能達成 本發明之目的。 惟以上所述者，僅為本發明之較佳實施例而已，當不 能以此限定本發明實施之範圍，即大凡依本發明中請專利 範圍及發明說明内容所作之簡單的等效變化與修飾，皆仍 屬本發明專利涵蓋之範圍内。 【圖式簡單說明】 圖1是本發明LED透鏡的—個較佳實施例的立體圖； 7 201200799 圖2是該較佳實施例的出光部底面呈側向的立體圖； 圖3是該較佳實施例的側視圖； 圖4是該較佳實施例的俯視圖； 圖5是類似圖2的視圖，且一 LED發光源容納在入光 凹部； 圖6是該較佳實施例沿X軸方向的縱向剖面圖，且該 LED發光源容納在入光凹部； 圖7是該較佳實施例的坎德拉分佈圖；以及 圖8是該較佳實施例的光形圖。201200799 VI. Description of the Invention: TECHNICAL FIELD The present invention relates to a lens, and more particularly to an LED lens. [Prior Art] & LEDs have the advantages of high luminous efficiency, long life, low power consumption, etc. In recent years, they have gradually replaced traditional light bulbs and become the first choice for new generation of light-emitting components, except for backlights for lighting farms or displays. Modules, etc., even with a wide range of street lamps that are in great demand, have gradually replaced traditional bulbs with light-emitting diodes. When a general street lamp is illuminated, its illumination area needs to cover the width of the entire road. Therefore, the preferred illumination area of the street lamp should be rectangular so as to cover the width of the entire road. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an LED lens that can make a lighting area of a light source rectangular. The LED lens of the present invention is used to cover an LED light source. The LED lens comprises a body, a light exiting portion and a light entrance recess. The body is made of a light transmissive material. The light exiting portion is formed on the body and has a light-emitting surface with a free curved surface, and the light-emitting surface can be divided into two outward convex arc-shaped surface regions along an X-axis direction and connected to the two outward convex arcs. An inwardly concave arcuate surface region between the surface regions, the minimum width of the inwardly concave surface region along a γ-axis direction and a Z-axis direction being smaller than the outward convex arc-shaped surface region along the Y-axis direction The maximum width in the Z-axis direction is perpendicular to a plane formed by the X-axis direction and the γ-axis direction. The light-incident concave portion is formed in a recessed structure of 201200799 on a side opposite to the light-emitting portion of the body for accommodating the LED light-emitting source, and the light-incident concave portion has a light-incident surface on the X-axis direction. The two side regions extend obliquely away from each other and the width of the recessed light recess along the X axis is less than half the width of the body along the X axis. The effect of the invention is that the light emitted by the LED illumination source can be rendered in a rectangular shape by the design of the light-injecting surface and the free-form surface design of the light-emitting surface to meet the lighting requirements of the street lamp. The above and other technical contents, features, and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments. Referring to FIG. 1 and FIG. 2, a preferred embodiment of the LED lens of the present invention is integrally formed of a plastic material (such as injection molding), and the LED lens i includes a body 10 of light transmissive material, a light exiting portion n, and an input. The light recess 12 and at least one positioning post 13 are provided. First, the X-axis direction referred to below is perpendicular to the γ-axis direction and defines a plane, and the z-axis direction is a plane defined by the vertical axis and the ¥ axis. Referring to FIG. 2 to FIG. 4, the body 1 of the embodiment has a longitudinally-cut half-male blue shape and has a top surface and a bottom surface 1〇1. The positioning protrusion 13 is formed by the bottom surface 112 of the body 1〇. It protrudes downward and has a positioning function. The light exiting portion 11 is formed on the top surface of the body 1 and has a light-emitting surface lu. The light-emitting surface 111 is a free-form surface which is generally a gourd shape, and the middle portion is necked. More detailed 201200799, along the x-axis direction of the body 10 The light-emitting surface U1 can be divided into two outwardly convex arc-shaped surface regions 113 and an inward concave arc-shaped surface region 114 connected between the two outwardly convex arc-shaped surface regions 113, two outward convex arcs. The surface area 113 is a substantially spherical curved surface, and the inward concave curved surface area 114 is a concave curved surface between the two spherical curved surfaces, and the width A2 of the inward concave curved surface area 114 in the X-axis direction is smaller than The width A1 of each of the outwardly convex arcuate surface regions 113 in the X-axis direction, and the minimum width W1 of the inwardly concave arcuate surface regions ι4 in the Y-axis direction of the body 10 are smaller than the two outwardly convex arc-shaped surface regions 113 in the γ-axis direction. The maximum width W2, the minimum height u of the inwardly concave arcuate surface region Π4 in the z-axis direction of the body 10 is also smaller than the maximum height L2 of the two outwardly convex arcuate surface regions 113 in the z-axis direction, and the light exiting surface 111 Whether in the X-axis direction or the γ-axis direction Axisymmetric structure. Referring to FIGS. 2 and 6, the light entrance recess 12 is formed on a side of the body 1 opposite to the light exit portion 11 and directly below the inward concave curved surface region 114. In the present embodiment, the light entrance recess 12 is provided. The bottom surface of the body 1〇 is formed and includes a light incident surface 121 and an annular inner surface 122. In the embodiment, the light incident recess 12 is a recessed structure formed by the bottom surface 1〇1 of the body 1〇. On the other hand, the two sides of the light-incident surface 121 located in the X-axis direction are obliquely extending away from each other to form a barrel-shaped concave curved surface, in other words, as shown in FIG. In the longitudinal section of the body 10 in the X-axis direction, the contour of the light incident surface 121 is an arc having both ends facing downward. The annular inner cymbal® 122 is extended from the outer edge of the light meter 121, and the light incident surface 121 and the annular inner surface 丨22 define a recessed space 123 of 201200799 for [ED light source l〇3 (for example, a packaged light emitting diode or a light emitting die) is housed inside and covers the light source 1〇3, and in the embodiment, the width A4 of the light entrance recess 12 in the X-axis direction is smaller than the entire LED lens 1 The body 10 has a width A5 of half along the x-axis direction. As shown in FIG. 5 to FIG. 7 , when the light emitted by the LED light source 1 〇 3 enters the body 1 through the light incident surface 121 and is emitted by the light exit surface lu, by the refraction of the light incident surface 121 and the light exit surface ,, The light exit angle of 60 degrees on both sides of the optical axis can be formed, and the curved surface design of the light incident surface 121 is such that when the light passes through the light incident surface 121, it is refracted by the axis direction of the body 1 ,, except In addition, by allowing the inward concave arcuate surface region 114 of the light exit portion u to be necked and recessed, and avoiding excessive concentration of light in the inward concave arcuate surface region 114, the light can be evenly distributed in the inward concave arc. The surface area ι 4 and the two outwardly convex arc surface areas 113 assume a rectangular light shape as shown in the light pattern of FIG. In summary, the LED lens of the present invention is designed by the structure of the light-incident surface 121 and the light-emitting surface ill, so that the light emitted by the LED light source 1〇3 can exhibit a rectangular shape to meet the lighting requirements of the street lamp, so The object of the invention is achieved. However, the above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent change and modification according to the scope of the patent and the description of the invention in the present invention. All remain within the scope of the invention patent. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a preferred embodiment of an LED lens of the present invention; 7 201200799 FIG. 2 is a perspective view of the bottom surface of the light exit portion of the preferred embodiment in a lateral direction; FIG. 4 is a plan view of the preferred embodiment; FIG. 5 is a view similar to FIG. 2, and an LED illumination source is housed in the light entrance recess; FIG. 6 is a longitudinal view of the preferred embodiment along the X-axis direction. A cross-sectional view, and the LED illumination source is housed in the light entrance recess; Figure 7 is a candela profile of the preferred embodiment; and Figure 8 is a plan view of the preferred embodiment.
8 201200799 【主要元件符號說明】 1 ......... • LED透鏡 W2…… ••向外凸弧狀表 面 10........ •本體 區域Y軸方向最大寬度 101…… •底面 L1…… ••向内凹弧狀表 面 11........ •出光部 區域Z軸方向最小高度 111…… •出光表面 L2…… ••向外凸弧狀表 面 112…… •底面 區域Z軸方向最大高度 113…… •兩向外凸弧狀表 A1…… ••向外凸弧狀表 面 面區域 區域沿 X軸方向寬度 114…… •向内凹孤狀表 面 A2…… …向内凹弧狀表 面 區域 區域沿 X軸方向寬度 12........ •入光凹部 A4…… …入光凹部沿X 軸 121…… '•入光表面 方向寬度 122…… ••環狀内表面 A5…… •LED透鏡本體沿 123…… •凹陷空間 X軸方向寬度 W1....... ••向内凹弧狀表 面 區域γ軸方向最小寬度8 201200799 [Explanation of main component symbols] 1 ......... • LED lens W2... ••Outwardly convex arc surface 10........ •Maximum width of the body area in the Y-axis direction 101 ...... • Bottom surface L1... ••Inward concave curved surface 11........ • Minimum height 111 in the Z-axis direction of the light exiting area... • Light-emitting surface L2... ••Outward convex curved surface 112... • The maximum height of the bottom surface area in the Z-axis direction is 113... • Two outwardly convex arc-shaped tables A1... •• The outward convex arc-shaped surface area area is 114 in the X-axis direction width... • Inward concave shape Surface A2 ... ... inward concave arc-shaped surface area area width in the X-axis direction 12........ • light entrance recess A4 ... ... light entrance recess along the X-axis 121 ... '• light-in surface direction Width 122... ••Circular inner surface A5... •LED lens body along 123... •Indentation space X-axis direction width W1....... ••Inward concave arc surface area γ-axis direction minimum width