201104282 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兩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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of optical lenses, particularly to a small-volume two-piece single-focus wide-angle lens group that receives infrared light wavelengths and can be focused. [Prior Art] Today's digital imaging technology continues to innovate and change, especially in digital cameras and
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CM0S亦被要求更小型化，在紅外線聚焦鏡片應用，除了運 用於攝影領域中，近年來亦大量轉用於紅外線接收、偵測領域， 亦皆朝小型化及大偵測角度發展。是以，有必要藉助一廣角鏡 片組以更進—步提升其彳貞測角。再者’習知廣片組大抵包 括夕片鏡片，且各鏡片之有效徑無法縮小的前提下，造成市售 廣角鏡頭體積、長度無法有效縮小，實無法滿足現今輕薄短小 之產品安裝需求。 鲁有鑑於此’如何提供—種兼具良好侧纽其他光學性 月匕’同時有效減少重量、體積及鏡頭長度之單焦點廣角鏡片組， 實為業界亟思改良之方向。 【發明内容】 本發明之主要目的係提供一種紅外線感應器之單焦點廣角 鏡片組’令該紅外線感應^具有較佳之雜、聚熱功能。 本發明之另-主要目的係提供一種具有較短光學長度及較 佳光學性能之兩片式單焦點廣角鏡片組。 201104282 ，發月之又—主要目的係提供—種光學财效徑較小、鏡 片較缚且整體鏡片組之長度變短的單焦點廣角鏡片組。 為I達成上述㈣，本制提供了—鮮絲廣 組，該早焦點廣角鏡片組包含有一固定光攔及一光學植，該 學組第—鏡片及m其排财式從物側至_ 之順序為·第一鏡片、光攔及第二鏡片。 該第-鏡片為具有負屈光力之透鏡且朝向物側為凸 面，且該第—鏡片之至少—面為非球^該第二鏡 屈光力之透鏡且朝向物侧為凸面，且該第二鏡片之至^、= 非球面。 夕由為 藉此，本發明為兩片式之 〜丨、瓜1亨元学長度變短 其有效錄小且鏡片㈣，崎以讀縮小鏡祕積及長度 並滿足現有輕薄短小之產品安裝需求。 【實施方式】 本發明採用有關合適的實施例並以圖式作為說明，其中， 本發明各實施_數值㈣設騎得，即使其他具有相同 結構的產品運用不同數值，仍應屬於本發明的保護料，在此 先行敘明。 請參考圖】及圖2兩實施例所示之兩片式單焦點廣角鏡片 組’本發明係—種用以褎置於紅外線感應器前方之單焦點廣角 鏡片組。於實施例中，該單焦點廣角鏡片組包含有—固定光爛i 和-光學組，且該光學組包含第…第二鏡片u、u，該光學 201104282 組沿著光軸，從物側A至像側B之排列順序為：第一鏡片、 光攔1及第二鏡片L2。 其中，該第-鏡片L1為具有負屈光力之透鏡且其朝向物側 A為凸面，該第二鏡>；L2為具有正屈光力之透鏡且朝向物側a 為凸面’且該第-、第二鏡片U、L2皆具有至少一面為非球面。 前述本發明即是由兩枚鏡片構成之光學組，而位於第二鏡 4 L2後方之第-平面平板玻璃2，具有令紅外線穿透之功效。 另於像側B前亦再設一第二平面平板玻璃3，該第二平面平板 玻璃3具有保遵感應ϋ之作用，該第―、第二平面平板玻璃2、 3依配適不同封裝結構之紅外線感應器可增、減，達到更佳偵測 效果。另於像侧Β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， 亦即第帛一鏡片可為非球面塑膠鏡片，由於使用塑膠材料 鲁可使鏡>1容易導以非球面結構呈現，而_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， 如圖1Α及圖Μ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（TANGENTIAL )數據資料，並將之做示意表現 :且由 ，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。 201104282 再來，請參照本發明之圖1B及圖2B，所示者分別為本發 明第一及第二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是物體侧起依序的透鏡面 號數表示。面號數i、2為第-鏡片L1的二面，面號數4、5為 第二鏡片L2的二面，而面號數6、7、8、9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線感應器之聚焦鏡片組之缺 點因此於第一鏡片L1朝向物側A為凸面，且第二鏡片L2朝 向物侧A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，因第一鏡片L1為一朝向物側a為凸面，因此必須 先控制第一鏡片與整體鏡片組之焦距比： 0.5 <|fl/|fl|<〇.9 ； 其中f為整個鏡片組的焦距值，打為第一鏡片的焦距值。 其次，第二鏡片L2朝向物側A為凸面，因此也必須控制 第一鏡片L2與整體鏡片組之焦距比，才能與第一鏡片u及整 個鏡片組之焦距比相互配合·· 201104282 〇·8 <|fl/|f2|<i.4 ； 其中Ω為第二鏡片的焦距值。 再者，亦需控制第一、第二鏡片L1、匕2之焦距比： 0-5 <|fl|/|f2|<2.5 ； 除此之外，為求降低鏡片組厚度，則必須控制整個鏡片組 的焦距值與整個鏡片組的長度比： 〇.l<|fl/|TL|<〇.5 ; 其中|TL|為整個鏡片組的長度。 滿足上述光學關係式，則可令單焦點廣角鏡片組之解像能 力顯著提昇，反之’糾、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’本發明光學組之第一、第一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： 其中z為沿光軸方向在高度為h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、C、D、 E、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 構第一、第二鏡片L1朝向物側靠近光軸附近皆為凸面設計，可 使得兩片式單焦點廣角鏡片組之畫角（即偵測角度）超越先前 201104282 :藝之角度(本發明之畫角已可達95。以上) =之解像能力。此外，相較於廣角鏡片組包括多= 夺良 身較厚的問題’本發明採用兩片式之廣角鏡片組，可= 度變短，其纽錄小且則_，餅單焦廣肖鏡片組之 體積、長度可大幅縮小，更能滿足 求以及製造容易等各方面需求。 再者，第一、第二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_喃並兼具實 用、好用進步性之發賴計，遂向觸提出發明專利申請， 祈請惠予審查並早曰賜准專利，至感德便。 201104282 【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纽之第二實施例之鏡片組成圖。 圖2A為本發明單焦點廣肖鏡片組之第二實施例之收差圖。 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。 【主要元件符號說明】 L1 :第一鏡片 L2 :第二鏡片 3:第二平面平板玻璃 A :物側 B :像側 1 :光攔 2:第一平面平板玻璃Digital carriers such as mobile phones are moving toward miniaturization, and photosensitive elements such as CCDs or CMOS are also required to be more compact. In infrared focusing lenses, in addition to their use in photography, they have been heavily used for infrared reception in recent years. In the field of detection, it is also developing towards miniaturization and detection. Therefore, it is necessary to use a wide-angle lens group to further improve the angle of detection. Furthermore, the conventional wide-film group generally covers the lens of the eve, and the effective diameter of each lens cannot be reduced. As a result, the size and length of the commercially available wide-angle lens cannot be effectively reduced, which cannot meet the needs of today's light and short products. In view of this, how to provide a single-focus wide-angle lens group that combines good optical and other optical moonlights while reducing weight, volume and lens length is the direction of improvement in the industry. SUMMARY OF THE INVENTION The main object of the present invention is to provide a single-focus wide-angle lens group of an infrared sensor, which has a better impurity and heat collecting function. Another primary object of the present invention is to provide a two-piece, single-focus wide-angle lens set having a shorter optical length and better optical performance. 201104282, the main purpose of the month is to provide a single-focus wide-angle lens group with a small optical effect, a thin lens and a shorter lens length. In order to achieve the above (4), the system provides a fresh silk group, the early focus wide-angle lens group includes a fixed light barrier and an optical implant, the group of the first lens and the m-throwing from the object side to the _ The order is · the first lens, the light barrier and the second lens. The first lens is a lens having a negative refractive power and is convex toward the object side, and at least the surface of the first lens is a lens of the second mirror refractive power and convex toward the object side, and the second lens is To ^, = aspherical. In view of this, the present invention is a two-piece type of ~ 丨, melon 1 henyuan learning length is shortened, its effective recording is small and the lens (4), Saki to read and reduce the secret and length of the mirror and meet the existing light and short product installation requirements . [Embodiment] The present invention adopts a suitable embodiment and is illustrated by the drawings. In the embodiment of the present invention, the numerical value (4) is set to ride, and even if other products having the same structure use different values, it should belong to the protection of the present invention. Expected to be described here first. Referring to the drawings and the two-piece single-focus wide-angle lens group shown in the two embodiments of the present invention, the present invention is a single-focus wide-angle lens group for placing the infrared sensor in front of the infrared sensor. In an embodiment, the single-focus wide-angle lens group includes a fixed photo-bright and an optical group, and the optical group includes a second lens u, u, the optical 201104282 group along the optical axis, from the object side A The order of arrangement to the image side B is: the first lens, the light barrier 1 and the second lens L2. Wherein, the first lens L1 is a lens having a negative refractive power and is convex toward the object side A, and the second lens>L2 is a lens having a positive refractive power and a convex surface toward the object side a and the first and the Both lenses U and L2 have at least one aspherical surface. The foregoing invention is an optical group composed of two lenses, and the first-plane flat glass 2 located behind the second mirror 4 L2 has an effect of penetrating infrared rays. In addition, a second flat plate glass 3 is further disposed on the front side of the image side B. The second flat plate glass 3 has the function of ensuring compliance, and the first and second flat plate glasses 2 and 3 are adapted to different package structures. The infrared sensor can be increased or decreased to achieve better detection. In addition, an infrared sensor is disposed at the side of the image. In addition, the lens group of the present invention can be made of plastic or glass according to requirements, that is, the first lens can be an aspherical plastic lens, and the use of the plastic material can make the mirror >1 easy to be represented by an aspherical structure. The _lens is an aspherical lens, which achieves a high-resolution single-focus wide-angle lens set with a high resolution and thus a reduction in the number of lenses required for imaging. In addition, the difference graph of the present invention uses non-point difference, distortion and spherical aberration, as shown in FIG. 1 and FIG. ,, no matter what kind of difference map is about the data of the d line, instead of receiving The difference is about the data of the s image plane (SAGITAL) and the data of the T image (TANGENTIAL), and it is shown as a schematic representation: and the difference diagram can clearly know that the compensation correction of the invention is a complete simulation design. The income has no problem in use. Referring to Figures 1B and 2B of the present invention, the aspherical data of the first and second embodiments of the present invention are shown. The uppermost 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; The focal length f: f is the combined focal length (mm) of the optical group. The lower two, four, four, five, six, seven, eight, and nine are the number of lens surface numbers in the order of the object side. The number i and 2 are the two sides of the first lens L1, the face numbers 4 and 5 are the two faces of the second lens L2, and the face numbers 6, 7, 8, and 9 are the first flat plate glass 2 and Two sides of the second flat plate glass 3. The present invention is intended to improve the disadvantage of the focusing lens group of the conventional infrared sensor, so that the first lens L1 is convex toward the object side A, and the second lens L2 is convex toward the object side A. 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 convex toward the object side a, it is necessary to first control the focal length ratio of the first lens to the entire lens group: 0.5 <;|fl/|fl|<〇.9; where f is the focal length value of the entire lens group, and is the focal length value of the first lens. Secondly, the second lens L2 is convex toward the object side A. Therefore, it is also necessary to control the focal length ratio of the first lens L2 and the entire lens group to match the focal length ratio of the first lens u and the entire lens group. · 201104282 〇·8 <|fl/|f2|<i.4; wherein Ω is the focal length value of the second lens. Furthermore, it is also necessary to control the focal length ratio of the first and second lenses L1 and 匕2: 0-5 <|fl|/|f2|<2.5; in addition, in order to reduce the thickness of the lens group, it is necessary to The ratio of the focal length value of the entire lens group to the length of the entire lens group is controlled: 〇.l <|fl/|TL|<〇.5; wherein |TL| is the length of the entire lens group. Satisfying the above optical relationship can significantly improve the resolution of the single-focus wide-angle lens group. Conversely, 'correcting or exceeding the range of data values of the optical image above' will result in low performance and low resolution of the single-focus wide-angle lens group. And problems such as insufficient yield. In addition, at least one side of the first and first lenses of the optical group of the present invention may have an aspherical shape, and the aspherical surface shape must satisfy the following formula: wherein z is a reference to the surface apex at a position of height h along the optical axis direction. Position value; k is the cone constant metric; c is the reciprocal of the radius of curvature; a, B, C, D, E, G, ... are high-order aspheric coefficients. In summary, the inventive design of the present invention utilizes the optical lens structure. The first and second lenses L1 are convexly designed toward the object side near the optical axis, so that the angle of the two-piece single-focus wide-angle lens group can be made. (ie detection angle) beyond the previous 201104282: the angle of art (the angle of the invention has reached 95.) = the resolution ability. In addition, compared with the wide-angle lens group, the problem of including a thicker body is thicker. The present invention adopts a two-piece wide-angle lens group, which can be shortened to a shorter degree, and the new record is small and _, the cake single focus lens group The volume and length can be greatly reduced, and it is more suitable for various requirements such as seeking and manufacturing. Furthermore, the first and second lenses can be aspherical plastic lenses, and the effect of enhancing the resolution of the focus can be improved, and the invention is a method that is both practical and useful. He made a patent application for the invention, and prayed for the review and early grant of the patent. 201104282 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 of the present invention. 2A is a diagram showing the difference of the second embodiment of the single focus wide lens group of the present invention. Fig. 2B is a view showing the optical characteristic data and the aspherical coefficient data of the second embodiment of the single-focus wide-angle lens group of the present invention. [Main component symbol description] L1: First lens L2: Second lens 3: Second flat plate glass A: Object side B: Image side 1: Light barrier 2: First flat plate glass