201027116 六、發明說明： 【發明所屬之技術領域】 本發明係涉及光學鏡頭領域，尤指一種以接收紅外線波長， 並可聚焦為訴求之小體積四片式單焦點廣角鏡片組。 【先前技術】 現今數位影像技術不斷創新、變化，特別是在數位相機與行 動電話等的數位載體皆朝小型化發展’而使感光元件如CCD或 ® CMOS亦被要求更小型化，在紅外線聚焦鏡片朗，除了運用於 攝影領域中，近年來亦大量轉用於紅外線接收、偵測賴，亦皆 朝小型化及大細角度發展。砂，有必要藉助—廣角鏡片組以 更進-步提升其偵_。再者，習知廣角鏡版之第—鏡片礙於 進入角較寬訴求，以致第-鏡片之外徑較大，導致整個鏡片組鏡 片彼此間之外差献，造成市域角鏡頭體積無法有效縮小 ❹且外型較不平整，實無法滿足現今輕薄短小之產品安裝需求。 有鑑於此，如何提供一種兼具良好偵測角及其他光學性能， 同時有效減少重量、體積之單焦點廣角鏡片組，實為業界丞思改 良之方向。 【發明内容】 本發明之主要目_提供-觀外線感顧之單紐廣角鏡 片組，令脉外魏絲具有健^雜功能。 本發明之另—主要目的储供1具有較大制角及較佳光 201027116 學性能之四片式單焦點廣缝片組。 本發明之又-主要目的係提供—種第―鏡片外徑較小， 體鏡片組之外徑較均句之單焦點廣角鏡片組。 m為了達成上述目的’本發明提供了一種單焦點廣角鏡片組， 該單焦點廣角鏡片組包含有一固定光欄及一光學組 电 含-第-鏡片、-第二鏡片、一第三鏡片及一第四鏡片= 方式從物側至像側之順序為：第-鏡片、光欄、第二鏡片、第三 ❹ 鏡片及第四鏡片。 其中’該第-鏡片為具有負屈光力之透鏡且其躺像侧為凹 面。該第—鏡片為具有正屈勤之透鏡且朝向像側為凸面，且其 至少有-面為非球面。再者，該第三鏡片為具有正屈光力之透鏡 且其朝向物侧為凸面。此外’該第四鏡片之至少—面為非球面。 藉此，賊有效增加該單焦點廣角鏡片組之_角度，同時 亦可望縮小第-鏡片之外徑，令整體鏡片組之外徑 ❹糾大_傾麵積，並献财輕舰奴產品安裝需求。 【實施方式】 本發明採时關合適的實關並關式作為朗，其中，本 發明各實施例的數值變化皆屬設計所得，即使其他具有相同結構 的產品運用不同數值，仍應屬於本發_保護範4，在此先行述 明。 請參考圖1、圖2及圖3三實施例所示之四片式單焦點廣角鏡 片組，本發明係一種用以裝置於紅外線感應器前方之單焦點廣角 201027116 鏡片組。於實施例中，該單焦點廣角鏡片組包含有一固定光搁^ 和一光學組，且該光學組包含第一、第二、第三、第四鏡片L1、 L2、L3、L4，該鏡片組沿著光軸，從物側a至像侧B之排列順序 為：第一鏡片L卜光攔卜第二鏡片u、第三鏡片L3及第四鏡 04。 其中’該第-鏡片L1為具有負屈光力之透鏡且其朝向像侧B 為凹面。該第二鏡片L2為具有正屈光力之透鏡且朝向像侧B為凸 〇 面，且其至少有一面為非球面。再者，該第三鏡片L3為具有正屈 光力之透鏡且其朝向物侧A為凸面。此外，該第四鏡片L4之至少 一面為非球面。 前述本發明即是由四枚鏡片構紅光學組，而位於第四鏡片 L4後方之第-平面平板玻璃2，具有令紅外線穿透之功效。另於 像侧B前亦再設-第二平面平板玻璃3，該第二平面平板玻璃3 具有保遵感應器之作用，該第一、第二平面平板玻璃2、3依配適 ©不聰裝結構之紅外線感絲可增、減，達到更佳偵測效果。另 於像侧B處則配置有一紅外線感應器。 此外，本發明之鏡片組可依需求而採用塑膠或玻璃材質，特 别疋第―、第四鏡片可為非球面塑勝鏡片由於使用塑膠材料可 使鏡片容㈣財球面結構线，而顧透鏡為非球面鏡片則 可達成解像力較高並進而減少成像所需之鏡片片數而能達到良好 品質的單焦點廣角鏡片組。 另外本發明之收差圖以非點收差、歪曲收差和球面收差， 5 201027116 如圖ΙΑ、圖2A及圖3A所示，無論何種收差圖皆是關於d線的 數據資料，而非點收差是關於s像面（SAGITAL)的數據資料跟 關於T像面（TANGEMTIAL)數據資料，並將之做示意表現；且 由收差圖可清楚獲知，本發明之收差補正都是完整模擬設計所 得’在使用上已沒有任何問題。 再來’請參照本發明之圖1B、圖2B及圖3B，所示者分別為 本發明第一、第二及第三實施例之非球面數據資料。其中，最上 © 方數據係本發明光學組各鏡片諸元之代號： F.No.:該F值於光學設計時，代表亮度參數，其中F值愈小 表示光亮度愈高； 畫角：2ω ; 焦點距離f : f為光學組之合成焦點距離（mm)。 而下方卜2、4、5、6、7、8、9、10、u、12、__ 起依序的透鏡面號數表示。面號數i、2為第一鏡片Ll的二面， ©面號數4、5為第二鏡片L2的二面，面號數6、7為第三鏡片^ 的二面，8、9為第四鏡片L4的二面，1〇、u、12、13分別為第 一平面平板玻璃2及第二平面平板玻璃3的二面。 本發明為求能改善習知紅外賊絲之聚焦組之缺點， 因此於第-鏡片L1朝向像側B為凹面，第二鏡片u朝向像則 為凸面，且第三鏡片L3朝向物侧a則為凸面。此外，為求達到最 佳成像品質’本發明必須滿足以下條件： 首先，因第-鏡片L1為-朝向像側B為凹面，因此必須先控 6 2〇1〇27116 制第一鏡片與整體鏡片組之焦距比： 0.4<|fl/|fl|<l ； 其中f為整個鏡片組的焦距值，fl為第一鏡片的焦距值。 其次，第二鏡片L2朝向像側b為凸面，而第三鏡面L3朝向 物侧A為凸面’因此也必須控制兩鏡片間之焦距比’才能與第一 鏡片L1及整個鏡片組之焦距比相互配合： 0<|f2 |/|f3|<0.5 ； ❹ 其中β為第二鏡片的焦距值，β為第三鏡片的焦距值。 再者’亦需控制第二、三、四鏡片L2、L3、L4之焦距值與整 個鏡片組的焦距比： 0.4<|f|/|f234|<l.l ； 其中f為整個鏡片組的焦距值，£234為第二鏡片、第三鏡片 及第四鏡片合成的焦距值。 另外，為求達到南品質成像，而必須控制其折射率； 參 N4> 1.57 ； V4<40 ； 其中N4為第四鏡片的折射率，V4為第四鏡片的阿貝係數 (Abbe number) ° 滿足上述光學式，則可令單焦點廣角鏡片組之解像能力顯著 提昇，反之，若小於或超出上述光學式之數據值範圍，則會導致 單焦點廣角鏡片組之性能、解像力低，以及良率不足等問題。 此外，本發明光學組之第二、第四鏡片至少一面可為非球面 形狀，該非球面的面型須滿足下列公式： 201027116 __ch2 Z~\ + [l-{k + \)c2h2fi + Ah +Bh + Chs + Dhxo + Ehn + Ghu +..... 其中Z為沿光轴方向在高度為}!的位置以表面頂點作參考的 位置值；k為錐常度量；c為曲率半徑的倒數；A、b、cE、 G'……為高階非球面係數。 綜上所述’本發明之創新發明設計，係運用此光學鏡頭結構 ❾第—鏡片L1朝向像側靠近光軸寸近為凹面及第二鏡>{ L2之朝向 像側與第二鏡4 L3之躺物侧靠近光购近處採凸面設計，可使 得四片式單焦點廣角鏡片組之晝角（即偵測角度）超越先前技藝 之角度（本發明之晝角已可達92.6。以上），同時亦能維持良好之 解像月t*力此外’相較於廣角鏡片組之第—鏡片具外徑過大之問 題本發明之第-鏡片得以大幅縮小，並和第二、第三、第四鏡 片間之外控更為均勻，使得單焦點廣角鏡片組之體積可大幅縮 ❹小’更能滿足現有_短小之產品絲需求以及製造容易等各方 面需求。 再者’第二、第四鏡片可為非球面之塑膠鏡片，更可提升聚 焦之成像解析度等功效，是以本發明乃屬—新穎並兼具實用、好 用進步性之發明設計，遂肖釣局提出發明專利申請，祈請惠予 審查並早曰賜准專利，至感德便。 201027116 【圖式簡單說明】 圖1為本發明單焦點廣角鏡片組之第一實施例之鏡片組成圖。 圖1A為本發明單焦點廣角鏡片組之第一實施例之收差圖。 圖1B為本發明單焦點廣角鏡片組之第一實施例之光學特性數據 與非球面係數資料示意圖。 圖2為本發明單焦點廣角鏡片組之第二實施例之鏡片組成圖。 圖2A為本發明單焦點廣角鏡片組之第二實施例之收差圖。 ❹圖2B為本發明單焦點廣角鏡片組之第二實施例之光學特性數據 與非球面係數資料示意圖。 圖3為本發明單焦點廣角鏡片組之第三實施例之鏡片組成圖。 圖3A為本發明單焦點廣角鏡片組之第三實施例之收差圖。 圖犯為本發明單焦點廣角鏡片組之第三實施例之光學特性數據 與非球面係數資料示意圖。 〇 【主要元件符號說明】 L1 :第一鏡片 L2 :第二鏡片 L3 :第三鏡片 L4 :第四鏡片 A :物侧 B :像侧 1 :光欄 2:第一平面平板玻璃 3:第二平面平板玻璃201027116 VI. Description of the Invention: [Technical Field] The present invention relates to the field of optical lenses, and more particularly to a small-volume four-piece single-focus wide-angle lens group that receives infrared wavelengths and can be focused. [Prior Art] Today's digital imaging technology continues to innovate and change, especially in the digitalization of digital cameras such as digital cameras and mobile phones. The photosensitive components such as CCD or ® CMOS are also required to be more compact, focusing in infrared. In addition to its use in the field of photography, the lens has been widely used in infrared reception and detection in recent years, and it has also developed towards miniaturization and large-scale. Sand, it is necessary to use the wide-angle lens group to further improve its detection. Furthermore, the first lens of the wide-angle lens version has a wide angle of entry, so that the outer diameter of the first lens is large, resulting in a difference between the lens groups of the entire lens group, resulting in an inability to effectively reduce the volume of the city lens. And the appearance is not flat, it can not meet the needs of today's light and short product installation. In view of this, how to provide a single-focus wide-angle lens group that combines good detection angle and other optical properties while effectively reducing weight and volume is a good direction for the industry. SUMMARY OF THE INVENTION The main object of the present invention is to provide a single-angle wide-angle lens group for viewing the external line, so that the extravascular filament has a healthy function. Another main object of the present invention is a four-piece single-focus wide-slit sheet set having a larger angle of formation and better light performance. A further object of the present invention is to provide a single-focus wide-angle lens group having a smaller outer diameter of the lens and a larger outer diameter of the body lens group. In order to achieve the above object, the present invention provides a single-focus wide-angle lens group including a fixed diaphragm and an optical group including a -first lens, a second lens, a third lens and a The fourth lens = the order from the object side to the image side is: a first lens, a light bar, a second lens, a third lens and a fourth lens. Wherein the first lens is a lens having a negative refractive power and the image side thereof is a concave surface. The first lens is a lens having a positive flexion and is convex toward the image side, and at least the face is aspherical. Further, the third lens is a lens having a positive refractive power and is convex toward the object side. Further, at least the face of the fourth lens is aspherical. Therefore, the thief effectively increases the angle of the single-focus wide-angle lens group, and at the same time, can also reduce the outer diameter of the first lens, so that the outer diameter of the entire lens group is ❹ _ _ _ _ _ _ _ _ _ _ _ Installation requirements. [Embodiment] The present invention adopts a proper closing and closing mode as a lang, wherein the numerical changes of the embodiments of the present invention are all designed, and even if other products having the same structure use different values, they should belong to the present invention. _ Protection Fan 4, which is stated here first. Referring to the four-piece single-focus wide-angle lens group shown in the third embodiment of FIG. 1, FIG. 2 and FIG. 3, the present invention is a single-focus wide-angle 201027116 lens group for use in front of an infrared sensor. In an embodiment, the single-focus wide-angle lens group includes a fixed light shelf and an optical group, and the optical group includes first, second, third, and fourth lenses L1, L2, L3, and L4, and the lens group Along the optical axis, the order from the object side a to the image side B is: the first lens L is light intercepted by the second lens u, the third lens L3, and the fourth mirror 04. Wherein the first lens L1 is a lens having a negative refractive power and is concave toward the image side B. The second lens L2 is a lens having a positive refractive power and has a convex surface toward the image side B, and at least one of the surfaces is aspherical. Further, the third lens L3 is a lens having a positive refractive power and is convex toward the object side A. Further, at least one side of the fourth lens L4 is aspherical. The foregoing invention is composed of four lenses constituting a red optical group, and the first-plane flat glass 2 located behind the fourth lens L4 has an effect of penetrating infrared rays. In addition, before the image side B, a second flat plate glass 3 is provided, and the second flat plate glass 3 has the function of a compliant sensor. The first and second flat plate glasses 2 and 3 are adapted to each other. The infrared ray of the installed structure can be increased or decreased to achieve better detection results. In addition, an infrared sensor is disposed on the image side B. In addition, the lens group of the present invention can be made of plastic or glass according to requirements, in particular, the first and fourth lenses can be aspherical plastic lenses, and the plastic lens can be used to make the lens (four) financial surface structure line, and the lens is Aspherical lenses provide a single-focus wide-angle lens set that achieves high resolution and thus reduces the number of lenses required for imaging to achieve good quality. In addition, the difference graph of the present invention uses non-point difference, distortion and spherical aberration, 5 201027116, as shown in FIG. 2A and FIG. 3A, no matter what kind of difference map is the data of the d line, The non-point difference is about the data of the s image plane (SAGITAL) and the data of the T-surface (TANGEMTIAL), and it is shown in the figure; and it can be clearly seen from the income map that the compensation of the present invention is It is a complete analog design. 'There is no problem in use. Referring again to Figures 1B, 2B and 3B of the present invention, the aspherical data of the first, second and third embodiments of the present invention are shown. Among them, the top-level data is the code of each lens of the optical group of the present invention: F.No.: The F value represents the brightness parameter in the optical design, wherein the smaller the F value, the higher the brightness; the angle of drawing: 2ω ; Focal distance f : f is the combined focal length (mm) of the optical group. The number of lens faces in the order of 2, 4, 5, 6, 7, 8, 9, 10, u, 12, __ is shown below. The number of faces i and 2 are two sides of the first lens L1, the number of face numbers 4 and 5 is two sides of the second lens L2, and the number of faces 6 and 7 are two sides of the third lens ^, and 8 and 9 are The two sides of the fourth lens L4, 1 〇, u, 12, and 13 are two sides of the first flat plate glass 2 and the second flat plate glass 3, respectively. The present invention is intended to improve the disadvantages of the focus group of the conventional infrared thief wire. Therefore, the first lens L1 faces the image side B as a concave surface, the second lens u faces the image as a convex surface, and the third lens L3 faces the object side a. It is convex. In addition, in order to achieve the best image quality, the present invention must satisfy the following conditions: First, since the first lens L1 is - the image side B is concave, it is necessary to control the first lens and the integral lens 6 2 〇 1 〇 27116 first. The focal length ratio of the group: 0.4<|fl/|fl|<l; where f is the focal length value of the entire lens group, and fl is the focal length value of the first lens. Secondly, the second lens L2 is convex toward the image side b, and the third mirror surface L3 is convex toward the object side A. Therefore, it is also necessary to control the focal length ratio between the two lenses to be able to be mutually proportional to the focal length ratio of the first lens L1 and the entire lens group. Coordination: 0<|f2 |/|f3|<0.5; ❹ where β is the focal length value of the second lens, and β is the focal length value of the third lens. Furthermore, it is also necessary to control the focal length ratio of the second, third and fourth lenses L2, L3, L4 to the focal length ratio of the entire lens group: 0.4 <|f|/|f234|<ll; where f is the entire lens group The focal length value, £234 is the focal length value synthesized by the second lens, the third lens and the fourth lens. In addition, in order to achieve south quality imaging, it is necessary to control its refractive index; see N4> 1.57; V4 <40; where N4 is the refractive index of the fourth lens, and V4 is the Abbe number of the fourth lens. The above optical type can significantly improve the resolution of the single-focus wide-angle lens group. Conversely, if it is less than or exceeds the above-mentioned optical data value range, the performance, resolution, and yield of the single-focus wide-angle lens group will be low. Insufficient issues. In addition, at least one side of the second and fourth lenses of the optical group of the present invention may have an aspherical shape, and the aspherical surface shape must satisfy the following formula: 201027116 __ch2 Z~\ + [l-{k + \)c2h2fi + Ah +Bh + Chs + Dhxo + Ehn + Ghu +..... where Z is the position value with reference to the surface apex at a position where the height is }! along the optical axis; k is the cone constant metric; c is the reciprocal of the radius of curvature; A, b, cE, G'... are high-order aspheric coefficients. In summary, the inventive design of the present invention utilizes the optical lens structure, the first lens L1 is close to the optical axis toward the image side, and is concave and the second mirror>{L2 toward the image side and the second mirror 4 The reclining side of L3 is close to the light purchase near the convex surface design, which can make the corner angle (ie detection angle) of the four-piece single-focus wide-angle lens group exceed the previous art angle (the corner of the invention has reached 92.6. At the same time, it can maintain a good resolution month t* force. In addition, the lens of the present invention has a large outer diameter which is greatly reduced compared with the lens of the wide-angle lens group, and the second and third, The external control between the fourth lens is more uniform, so that the volume of the single-focus wide-angle lens group can be greatly reduced, which can meet the needs of the existing _ short product wire and easy manufacturing. Furthermore, the 'second and fourth lenses can be aspherical plastic lenses, which can improve the imaging resolution of focusing, etc., and are based on the invention, which is novel and practical, and has good progressive design. Xiao Fishing Bureau filed an application for a patent for invention, praying for a review and early granting of a patent, to the point of feeling. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a lens composition diagram of a first embodiment of a single-focus wide-angle lens group of the present invention. 1A is a diagram showing the difference of the first embodiment of the single-focus wide-angle lens group of the present invention. Fig. 1B is a schematic view showing optical characteristic data and aspherical coefficient data of the first embodiment of the single-focus wide-angle lens group of the present invention. 2 is a lens composition diagram of a second embodiment of the single-focus wide-angle lens group of the present invention. 2A is a diagram showing the difference of the second embodiment of the single-focus wide-angle lens group of the present invention. 2B is a schematic view showing optical characteristic data and aspherical coefficient data of a second embodiment of the single-focus wide-angle lens group of the present invention. Fig. 3 is a view showing the lens composition of a third embodiment of the single-focus wide-angle lens group of the present invention. 3A is a diagram showing the difference of the third embodiment of the single-focus wide-angle lens group of the present invention. The figure is a schematic diagram of optical characteristic data and aspherical coefficient data of the third embodiment of the single-focus wide-angle lens group of the present invention. 〇 [Main component symbol description] L1: First lens L2: Second lens L3: Third lens L4: Fourth lens A: Object side B: Image side 1: Light bar 2: First flat plate glass 3: Second Flat plate glass