TWI323359B

TWI323359B - Optical lens system for taking image

Info

Publication number: TWI323359B
Application number: TW96102330A
Authority: TW
Inventors: Sayuli Noda
Original assignee: Largan Precision Co Ltd
Priority date: 2007-01-22
Filing date: 2007-01-22
Publication date: 2010-04-11
Also published as: TW200831976A

Description

九、發明說明：【發明所屬之技術領域】特別是指一種小型化的攝影鏡行動電話或是PDA產品内。本發明係一種攝影鏡片組，片組；適用於常見的數位相機、【先前技術】伴隨著數位相機、行動電話或是pM產品的小型化，其内攝影光學线會被要求設計_、：前輯影光學㈣使用的 CCD或CM0S等攝像素子同樣朝著小型化及高晝素能力在研發 H相發的絲系就必須要可以對應小型化及南晝素能力的要求。二寸變小，，再插八_ 的後隹合有〜、兄片）’造成確保攝影鏡片組上必4 灸…、曰有困難度，且攝影鏡片組光學全長 ^ 差般的攝衫鏡片組光學全長變短時，其入射角的特性會=之今文獻特開2 〇報、特開2〇〇 5 0 5〜〇〇40 45919號公報胜 55唬公報、特開20 報、特開開 2 0 0 61 3 5 2 2 〇6 號 70號公•特開2。二=:2°。6一 ^ 4 〇號公報中 1323359 多改進的方案；前述方案妓採龍平常要小的小型攝影鏡片’原本開口光11魏置在物側，其射出瞳位置距離像面較遠，入射㈣性可良好確保的三合透鏡，也制了塑膠材料，有變曲點的非球面形狀。前述習用技術中的問題在於：該特開2 0 0 5 - 〇〇 4 〇 4 5號公報的望遠比較大，約為1. 35〜1· 48 (錄味_轉對絲全長触），此較大的望遠比對小型化設計產生限制；該特開2 0 〇 5 - 2 2 7 7 5 5號公報也確保了後焦’且望遠比L 19，可以符合小型化的要求，但是其晝角58度過小；該特開 2005 — 34591 19唬^報所能達成的望遠比1.35〜1.48,同樣過大；主、該特開2 0 0 5 — 3 5 220 A % 為L 38也是過大； t報的產品望遠比約該特開2 〇〇 6 — 1◦ 6 3 2 1號公報產品達成的望遠比心可鳴他_，妓㈣㈣過小；该特開 2〇〇6 幻π τ 〃 0破公報的產品望遠比約為U8,可以付合小型化的要求，但是f减85較暗；補開2 〇 0 6 - 1 6 3 3 4 〇號八4 過大的望敍1.3。 4Q麵陶品則會產生 ‘種能有效小本發明有鑒於上述的習用_，改進研發出 7 1323359 型化，並產生較小的望遠比的設計，且以3片攝影鏡片就能確保晝角。【發明内容】本發明的首要目的是提供望遠比較小、晝角能確保的3片式構成攝影鏡片組。要達成前述目的，本發明攝影鏡片組從物側依序排列有光圈、第一鏡片、第二鏡片及第三鏡片；其中： S亥第一鏡片是凸面向物側的正凹凸透鏡； §亥第二鏡片是凸面向著像側的負凹凸透鏡；邊第二鏡片是凸面向著物側的正凹凸透鏡；月'J述3片鏡片的兩面都是非球面，且皆為塑膠鏡片，當f 是全系焦點距離、Nine, invention description: [Technical field to which the invention pertains] In particular, it refers to a miniaturized photographic lens mobile phone or PDA product. The invention relates to a photographic lens group, a film group; suitable for a common digital camera, [Prior Art] With the miniaturization of a digital camera, a mobile phone or a pM product, the photographic optical line is required to be designed _, : Photographic optics (4) Cameras such as CCD or CM0S are also required to be able to meet the requirements of miniaturization and Nanxun ability in the development of H-phase filaments in the direction of miniaturization and high-purity. Two inches become smaller, and then insert eight _ after the combination of ~, brother film) 'cause to ensure that the photographic lens group must be 4 moxibustion ..., 曰 difficult, and the photographic lens group optical full length ^ poor lens shirt When the total optical length of the group is shortened, the characteristics of the incident angle will be = the current document opening 2 〇 report, special opening 2〇〇5 0 5~〇〇40 45919 bulletin win 55唬 bulletin, special open 20 report, special opening Open 2 0 0 61 3 5 2 2 〇6 No. 70 public • Special opening 2. Two =: 2 °. 6 1 ^ 4 〇公报 bulletin 1323359 more improved scheme; the above scheme 妓龙 Long Ping often small small photographic lens 'original open light 11 Wei placed on the object side, its exit pupil position distance from the image surface far, incident (four) A well-guaranteed triplet lens is also made of a plastic material with an aspherical shape with inflection points. The problem in the prior art is that the telescope of the Japanese Patent Publication No. 2 0 0 5 - 〇〇4 〇 4 5 is relatively large, about 1.35~1·48 (recording _ turn to the full length of the silk), this The larger telescope has a limit on the miniaturization design; the special opening 2 0 〇 5 - 2 2 7 7 5 5 also ensures the back focus 'and the telephoto ratio L 19, which can meet the requirements of miniaturization, but the other The angle of 58 degrees is too small; the special opening 2005 - 34591 19唬 ^ report can achieve a far-reaching ratio of 1.35 to 1.48, the same too large; main, the special opening 2 0 0 5 - 3 5 220 A % is too large for L 38; The reported product looks farther than the heart of the special opening 2 〇〇 6 — 1◦ 6 3 2 1 bulletin. _, 妓 (4) (4) is too small; the special opening 2〇〇6 幻π τ 〃 0 broken The product of the bulletin is about U8, which can meet the requirements of miniaturization, but f minus 85 is darker; replenishing 2 〇 0 6 - 1 6 3 3 4 nickname 8 4 oversized. The 4Q surface ceramics will produce 'the kind of energy can be effectively small. The invention has been developed in view of the above-mentioned practices _, improved the development of 7 1323359 type, and produced a smaller telescopic ratio design, and can ensure the corner angle with 3 photographic lenses. . SUMMARY OF THE INVENTION The primary object of the present invention is to provide a three-piece photographic lens group that has a relatively small telescope and a corner angle can be secured. To achieve the foregoing objective, the photographic lens group of the present invention sequentially has an aperture, a first lens, a second lens and a third lens arranged from the object side; wherein: the first lens of the S-H is a positive meniscus lens convexly facing the object side; The second lens is a negative meniscus lens convexly facing the image side; the second lens is a positive meniscus lens convexly facing the object side; the two faces of the moon are all aspherical, and both are plastic lenses, when f Is the focal distance of the whole system,

—1. 2的條件。 —本發明攝影鏡片组的光學系是由第一鏡片、第二鏡片與第 -鏡片的3片式構成（通稱3合鏡片由於3片鏡片都是塑膠—1. 2 conditions. - The optical system of the photographic lens group of the present invention is composed of a first lens, a second lens and a third lens of the first lens (commonly known as a 3-to-lens lens, since all three lenses are plastic)

且本發明滿足0. 7< f l/f 比，有效實現小型化； <0.9 及一3.5< f 2/f < — δ 1323359 1. 2的條件後，其人射角特性可良好的完成補正，且本發明的望遠比有效被抑制’更能確保晝角，並有適切收差補正的光學性能；如果f ,/ f在0. 7以下，第一鏡片的屈折力變的太大，會造成多次方的球面收差及COMA收差變的不好；若疋f i/ f在0. 9以上’第一鏡片的正屈折力會變弱，光學全長將變長；還有’當【2/£如在-3. 5以下時，該第二鏡片的屈折力變的太小，倍率色收差的補正變的困難；當f 2/ f如在-h 2以上時，像面收差會變的不好，進而造成收差無法良好補正。And the present invention satisfies the ratio of 0.7/lt;f/f, and effectively realizes miniaturization; <0.9 and a 3.5<f 2/f < - δ 1323359 1. The condition of the human can be excellent after the condition The correction is completed, and the telescope of the present invention is more effective than the effective suppression, and the optical properties of the first lens are too large; if f, /f is below 0.7, the refractive power of the first lens becomes too large. , will cause multiple spherical balance and COMA income is not good; if 疋fi / f is above 0.9. 'The positive refractive power of the first lens will become weaker, the optical length will become longer; When [2/£ is below -3.5, the refractive power of the second lens becomes too small, and the correction of the magnification of the magnification is difficult; when f 2/ f is above -h 2, the image The face-to-face difference will not be good, and the result will not be able to make a good correction.

4夕’本發明在d2是第—鏡片與第二鏡片的間隔時，可以滿t以下的條件式 T正屈折的第一鏡片與負屈折的第二鏡片的間隔變的太 d乍’轴外性能的均勻性不好，諸收差無法良好的補正；而當片的Π 25 :上時’正屈折的第一鏡片與負屈折的第二鏡型化的Γ摘太見大，進而造成第三鏡片的外徑變大，影響小化的表現，财._丨1⑽也會變大。發月在R,是第—鏡片的物側曲率半徑、L是第一鏡 1323359 片的像側曲率半徑時，要滿足以下的條件式：〇. 2〇<Ri/R2 <0. 55 ;當1^/112在0. 2以下時，球面收差變大，後焦變得比需要還要長；當化/R2在0· 55以上時，後焦變短，入射角的特性變不好。本發明的R3疋第一鏡片的物側曲率半徑、I是第二鏡片的像側曲率半徑時，要滿足以下的條件式：〇 6<R3/R4〈 0.8 ;當R3/R4在0.6以下時，像面彎曲及c〇ma收差的補正會過剩，進而造成性能劣化；當尺3〆!^在〇 8以上時，像面彎曲及coma收差的補正會不足，進而造成性能變不好。本發明在1^5是第三鏡片的物側曲率半徑時，要滿足以下的條件式：〇.6<R5/f <1.1 ;當R5/f在0.6以下時，第二鏡片物側面的醉半徑變的太小，第三鏡片的週邊部會像倒向像面側的形狀，後焦變的不好確保；還有，這樣隨著面間的全反射，敕县旅a 乃仏狀耵孕又易發生強的Ghost;當Rs/f在上時，入㈣特性變壞，這個部分補正咖收差惡化。文/兩 0以下 "f 12是第—鏡片與第二鏡片的合成焦ό 足以下的條件式：1 〇< f Α·υ< fl2yf <L4; 12/f 1323359 日:’第-鏡片及第二鏡片的合成屈折力變的太強，後焦變短，還有，其人射角的特性會變得不好；t f i2/ f在4以上時，因為射出瞳位置從像面分離，人射角的特性會變好，但是書變的狹窄。 — 本發明在f3是第三鏡片的焦點距離時，要滿足以下的條件式：-0.5<f2/f3 <〇·〇;當！2/^3在_〇 5以下時，^ 於第二鏡片的負屈折力來說，第三鏡片的正屈折力變的太強，無法取得均勻的倍率色收差；當f 2/ f 3在〇. 〇以上時，第二鏡片的正屈折力會消失，入射角的特性變的不好。【實施方式】對於本發明鏡片的合適實施例將配合圖面來說明，本發明第1圖到弟8圖是實施例1到實施例8的鏡片構成圖（第ία圖〜第8A圖）及光學特性資料與收差圖（第π圖〜第8B圖）；而第 9A〜9C圖是各實施例的非球面資料；本發明是採3片構成式設计’可以内藏於數位相機或是手機的光學系内，確為具備有良好效能的發明。弟1A圖〜弟8 A圖是表示各貫施例攝影鏡片組的光學配置。各實施例的攝影鏡片組皆沿著光軸，從物側依序包括有光圈（10)、第一鏡片（L1)、第二鏡片（L2)、第三鏡片（L3)、平 11 1323359 行平面玻璃（20)及成像面（30)，其中：該第一鏡片（L1)是凸面向物側的正凹凸透鏡，其兩個面都是非球面，且以塑膠製作而成；該第二鏡片（L2)是凸面向著像側的負凹凸透鏡’其兩個面都是非球面，且以塑膠製作而成；該第三鏡片（L3)是凸面向著物側的正凹凸透鏡，其兩個面都是非球面，且以塑膠製作而成；該平行平面玻璃（20)有IR Cut Filter(紅外線過濾）的機能；該成像面（30)配置CCD或CMOS等攝像素子。第一鏡片（L1)、第二鏡片（L2)以及第三鏡片（L3)皆是塑膠材料的成形品，故本發明與習用的玻璃鏡片比較起來，確能削減材料成本，且材料的管理成本也可減少；還有，本發明的各鏡片的每一個面都是非球面，因此可以用少量的3片構成模式達到所需的光學性能；另外，採用聚碳酸脂等低價的材料，且第—鏡片（L1)、第二鏡片（L2)及第三鏡片（L3)的屈折率都小於 L 6，這是個設計上較佳的數據選擇。再請參閱第1B圖〜第8B圖，各圖的最上方是鏡片的各項目’以焦點距離：f、F No. : F、晝角：2 ω來表示，焦點距離 12 1323359 f是全光學系的焦點距離；在各圖下面依序是（第1、2...8面）編號，這是代表從物側依序排列的各面號碼，第1、2面是第一鏡片（L1)的兩面，第3、4面是第二鏡片（L2)的兩面，第5、 6面是第三鏡片（L3)，第7、8面是平行平面玻璃（2)的兩面，其曲率半徑r是〇〇;還有，第-鏡片⑼的第丨面處配置了光圈（10); 而且’曲率半徑r在於近軸上是用曲率半徑(麵）來表示， d則疋面間隔（mm)數值、nd是屈折率、u d是壯數；還有’收差圖類如球面收差、非點收差、歪曲收差等，都有個別提示；無論是哪-個圖，都是關於樣的資料，非點收差是表示Sagittal 4象面⑻與meridi〇nal像面（M)相關的資料，這些的收錢數據可崎明，本發_正到實用水平沒有問題。前述各鏡片的任-面都是非球面形狀，非球面形狀以八、 B、C、D、E為非球面係數’從光軸的高μ置光軸方向的變位X作為φ獅的表科，要符合町的式子： X (1//R)H//〔1+{1-(1+K) ( H/R ) 2}1/2〕+ah4 + bh6+ch8+dh1q+eh12。前述算式中：R是近軸曲率半徑、以咖-係數。非球面係數E - 〇 3等的技術是i 〇-3竟思。本發明的f是鏡片全系的焦點距離二是第一鏡片的焦 13 點距離時，撕π的物：G.7<iI/f<09。尸折2式付知’备VQ0·7以下時，訣第—鏡片L1的讀力㈣太大’多次方的球面收差與_收差變在0.9以上時，第—户y τ〇學全長變長。 L2的正屈折力ϋ為變弱，光本發明的f是鏡片全系的焦點距離的焦點輯時，要滿足以下的條件式：^一鏡片L2 ~3.5<f2/f <-1.2。當 f 2/ f 在? 法得到良好的補正。4 ’像时錢料好，且收差無 :發財d2是第，u與第2鏡片L 滿足^的條件式：G.1G<d2/i<〇.25。折力^^ f在〇· 1以下時，正屈折力的第一鏡片L1與負屈、片L2的間隔變的狹窄，軸外性能的均等性變不 ’諸收差無法得到良好的補正。當 d2/ f 右 n 9C：、的間隔因為變寬，使乂味弟鏡β U與第二鏡片L2 小型化的鏡片L3的外徑變大，有損本發明遇有’垓產品的coma flare也變大。的R丨疋第一鏡片L1的物側曲率半徑、r2是第— 鏡片U的像側曲率半辦，符合以下的條件式：〇.2〇<Ri/R2<0.55。 1323359 。亥R’/Ra 〇. 2以下時，球面收差變大，後焦變的比需要的還要長，該R,/R2M55以上時，後焦變短、使入的特性變不好。本發明的尺3是第二鏡片L2的物側曲率半徑、L是第二鏡片L2的侧鲜半辦，要滿足以下的條件式：〇.6<R3/r4 <〇 8。In the present invention, when d2 is the interval between the first lens and the second lens, the interval between the first lens that is full of t and the condition that the T is positively folded and the second lens that is negatively deflected becomes too large. The uniformity of performance is not good, and the collections cannot be well corrected; and when the Π 25: on the film, the first lens that is being inflected and the second lens that is negatively inflected are too big, resulting in the first The outer diameter of the three lenses becomes larger, which affects the performance of the small ones, and the money._丨1(10) also becomes larger. When R is the radius of curvature of the object side of the first lens and L is the curvature radius of the image side of the first lens 1323359, the following conditional expression is satisfied: 〇. 2〇<Ri/R2 <0. 55 When 1^/112 is less than 0.2, the spherical aberration becomes larger, the back focus becomes longer than necessary; when the /R2 is above 0.55, the back focus becomes shorter, and the characteristics of the incident angle become longer. not good. When the R3 疋 first lens of the present invention has the object side curvature radius and I is the image side curvature radius of the second lens, the following conditional expression is satisfied: 〇6 < R3/R4 < 0.8; when R3/R4 is 0.6 or less The correction of the image surface curvature and the c〇ma collection will be excessive, which will cause performance degradation. When the ruler 3〆!^ is above 〇8, the correction of the image surface curvature and the coma income will be insufficient, resulting in poor performance. . In the present invention, when 1^5 is the radius of curvature of the object side of the third lens, the following conditional expression is satisfied: 〇.6 < R5/f <1.1; when R5/f is 0.6 or less, the side of the second lens object The drunk radius becomes too small, the peripheral part of the third lens will be like the shape of the reverse side of the image side, and the back focus will not be ensured well; and, so, with the total reflection between the faces, the county will be a Pregnancy is prone to strong Ghost; when Rs/f is on, the (4) characteristics deteriorate, and this part of the correction is worse. Text/two below 0"f 12 is the synthetic eschar of the first lens and the second lens. The conditional formula is: 1 〇< f Α·υ< fl2yf <L4; 12/f 1323359 Day: '第- The synthetic refractive power of the lens and the second lens becomes too strong, the back focus becomes short, and the characteristics of the human angle of the lens become poor; when tf i2/f is 4 or more, the position of the exit pupil is from the image plane. Separation, the characteristics of the human angle will become better, but the book becomes narrower. - The present invention satisfies the following conditional formula when f3 is the focal length of the third lens: -0.5 <f2/f3 <〇·〇; when! 2/^3 When _〇5 or less, ^ In the negative refractive power of the second lens, the positive refractive power of the third lens becomes too strong, and a uniform magnification color difference cannot be obtained; when f 2/ f 3 When 〇. 〇 or more, the positive refractive power of the second lens disappears, and the characteristics of the incident angle become poor. [Embodiment] A suitable embodiment of the lens of the present invention will be described with reference to the drawings. Figs. 1 to 8 show the lens configuration diagrams of the first embodiment to the eighth embodiment (Fig. 8A). Optical characteristic data and income difference map (Fig. π to Fig. 8B); and Figs. 9A to 9C are aspherical data of each embodiment; the present invention is a three-piece design that can be built in a digital camera or It is the optical system of the mobile phone, and it is indeed an invention with good performance. Figure 1A to Figure 8A show the optical arrangement of each of the photographic lens groups. The photographic lens groups of the embodiments are all along the optical axis, and sequentially include an aperture (10), a first lens (L1), a second lens (L2), a third lens (L3), and a flat 11 1323359 line from the object side. a flat glass (20) and an image forming surface (30), wherein: the first lens (L1) is a positive meniscus lens convexly facing the object side, both surfaces of which are aspherical and made of plastic; the second lens (L2) is a negative meniscus lens convexly facing the image side, both surfaces of which are aspherical and made of plastic; the third lens (L3) is a positive meniscus lens convexly facing the object side, two of which The surface is aspherical and made of plastic; the parallel flat glass (20) has the function of IR Cut Filter; the imaging surface (30) is equipped with camera elements such as CCD or CMOS. The first lens (L1), the second lens (L2), and the third lens (L3) are all molded articles of plastic materials, so the present invention can reduce the material cost and the management cost of the material compared with the conventional glass lens. It is also possible to reduce; further, each face of each lens of the present invention is aspherical, so that a small amount of three-piece configuration mode can be used to achieve desired optical performance; in addition, a low-cost material such as polycarbonate is used, and - The refractive index of the lens (L1), the second lens (L2) and the third lens (L3) are all less than L 6, which is a better design choice. Referring again to Figures 1B to 8B, at the top of each figure is the item of the lens 'represented by the focal distance: f, F No. : F, angle: 2 ω, the focal length 12 1323359 f is all-optical The focal length of the system; in the following figures, the number is (1st, 2nd, 8th). This is the number of each face that is arranged in order from the object side. The first and second faces are the first lens (L1). On both sides, the third and fourth faces are the two faces of the second lens (L2), the fifth and sixth faces are the third lens (L3), and the seventh and eighth faces are the two faces of the parallel plane glass (2), and the radius of curvature thereof r is 〇〇; also, the aperture (10) is arranged at the first plane of the first lens (9); and 'the radius of curvature r is represented by the radius of curvature (face) on the paraxial axis, and d is the interval of the pupil (mm) The value, nd is the inflection rate, ud is the strong number; and there are 'receiving graphs such as spherical aberration, non-point collection, distortion, etc., all have individual hints; no matter which one is, it is all about The data, the non-point difference is the information related to the Sagittal 4 image (8) and the Merid〇nal image (M). The data collected can be succinct, and the issue is not practical. . Any of the above-mentioned lenses has an aspherical shape, and the aspherical shape has an aspherical coefficient of eight, B, C, D, and E. The displacement X from the optical axis of the optical axis is taken as the table of the φ lion. To match the style of the town: X (1//R)H//[1+{1-(1+K) ( H/R ) 2}1/2]+ah4 + bh6+ch8+dh1q+eh12 . In the above formula: R is the paraxial radius of curvature, and the coffee-coefficient. The technique of the aspheric coefficient E - 〇 3 is i 〇-3. The f of the present invention is a material that tears π when the focal length of the entire lens is the distance of the focal point of the first lens: G.7 < iI / f < 09. The corpse fold 2 formula pays 'when the VQ0·7 or less is prepared, the reading force of the lens L1 is too large. 'The spherical balance of the multiple times and the _the difference is 0.9 or more, the full length of the first y τ 〇 lengthen. The positive refractive power of L2 is weak, and the light of the present invention is the focus of the focal length of the entire lens, and the following conditional expression is satisfied: L1 to 3.5 < f2/f <-1.2. When f 2/ f is well corrected, the method is corrected. 4 ‘When the money is good, and the difference is not: the wealth d2 is the first, u and the second lens L satisfy the conditional formula of ^: G.1G<d2/i<〇.25. When the folding force ^^ f is 〇·1 or less, the interval between the first lens L1 of the positive refractive power and the negative bending plate and the sheet L2 becomes narrow, and the uniformity of the off-axis performance does not become good. When the interval between d2/f and n9C:, becomes wider, the outer diameter of the lens L3 which is miniaturized by the scented mirror β U and the second lens L2 becomes large, which detracts from the coma flare of the present invention. It also gets bigger. The curvature radius of the object side of R 丨疋 first lens L1 and r2 are half of the curvature of the image side of the first lens U, and satisfy the following conditional formula: 〇.2〇<Ri/R2<0.55. 1323359. When the angle R is less than or equal to 2, the spherical surface difference becomes larger, and the back focus becomes longer than necessary. When R, /R2M55 or more, the back focus becomes short and the characteristics of the input become poor. The rule 3 of the present invention is the radius of curvature of the object side of the second lens L2, and L is the side of the second lens L2, and the following conditional expression is satisfied: 〇.6 < R3/r4 < 〇 8.

當匕凡在〇. 6以下時，其像面彎曲、_收差的補正變過剩，造成性能劣化。當R3/m8以上時，像面彎曲、鳴收差的補正變的不足，使軸外性能變的不好。本發明眺是第三鏡片L3的物側曲率半徑時、要滿足以下的條件式：〇.6<R5/f <U。When 匕凡 is below 〇6, the image surface is curved, and the correction of _reduction is excessive, causing performance degradation. When R3/m8 or more, the correction of the image plane curvature and the sound collection is insufficient, and the off-axis performance is not good. When the present invention is the radius of curvature of the object side of the third lens L3, the following conditional expression is satisfied: 〇.6 < R5/f < U.

當Rs/f在0.6以下時，第三鏡片物側曲率變太小，第三鏡二L3的週邊部傾倒向像面側的形狀，使後焦較無法確保；還有，如此的鏡片形狀會使各面間的反射變強，變的較容易心生Ghost，§R5/f在1;1以上時，入射角的特性變的不好，如果作了補正時coma收差會惡化。本發明的f12是第一鏡片L1與第二鏡片L2的合成焦距時，要滿足以下的條件式：1.0< f 12/f <1.4。而i〗2/ f在1. 〇以下時，第一鏡片及第二鏡片U的 &成屈折力I的太強，後焦變短；還有，人射角的特性也變不 15 1323359 好，當f ls/ f在14以上時，因為射出瞳位置從像面分離，入射角變的較好，但是晝角變的狹窄。本發明的f 3是第三鏡片L3的焦點距離時、要滿足以下的條件式：-0. 5< f 2/f 3 <〇〇。當h/f 3在-0.5以下時’第二鏡片L2的負屈折對應的第—鏡片L3的正屈折力變的太強，無法取得倍率色收差的均等性。菖f 2/ f 3在〇. 〇以上時，第三鏡片L3的正屈折力會消失，入射角的特性變不好。關於以上各點的實施例，條件式上的參數，如表1資料所顯示，在表1之中可以了解，本發明的攝影鏡片從望遠比τ (τ是從第一鏡片L1的物側第i面到成像面的長），此值可以在1· 15以下，且與原先的技術作比較後，證明本發明確是可以達到小型化要求；還有，關於入射角特性部份，該入射角α (到攝像素子的最大入射角）可以在25度以下，同樣能獲得良好的確保；亦即是，關於入射角特性：主光線傾角 15度以内、由鏡片射出進入攝像素子皆是必要的；但是，隨著攝像素子領域的技術進步(Macro鏡片的形狀變更），該入射角α約25度下，就可以容許，但是晝角則無論是配合哪一個實施例都是63度；以上實施例就可以確保本發明的功效足夠。 16 1323359 如上所述，本發明創新結構設計係一種攝影鏡片組，其從物側依序排列為光圈、第一鏡片、第二鏡片及第三鏡月配置，第一鏡片是凸面向物側的正凹凸透鏡，第二鏡片是凸面向著像When Rs/f is 0.6 or less, the curvature of the third lens object side becomes too small, and the peripheral portion of the third mirror two L3 is tilted to the shape of the image surface side, so that the back focus is less secure; and, such a lens shape will The reflection between the faces is made stronger, and the Ghost is easier to change. When §R5/f is 1 or more, the characteristics of the incident angle are not good, and if the correction is made, the coma difference will deteriorate. When f12 of the present invention is a composite focal length of the first lens L1 and the second lens L2, the following conditional expression is satisfied: 1.0 < f 12 / f < 1.4. When i is 2/f below 1. 〇, the first lens and the second lens U are too strong for the refractive power I, and the back focus becomes short; and the characteristics of the human angle are not changed 15 1323359 Well, when f ls / f is 14 or more, since the exit pupil position is separated from the image plane, the incident angle becomes better, but the corner angle becomes narrow. When f 3 of the present invention is the focal length of the third lens L3, the following conditional expression is satisfied: -0. 5 < f 2/f 3 < 〇〇. When h/f 3 is -0.5 or less, the positive refractive power of the first lens L3 corresponding to the negative inflection of the second lens L2 becomes too strong, and the uniformity of the magnification of the magnification color cannot be obtained. When 菖f 2/ f 3 is 〇. 〇 or more, the positive refractive power of the third lens L3 is lost, and the characteristics of the incident angle are not improved. Regarding the embodiments of the above points, the parameters on the conditional expression are as shown in the data in Table 1. As can be seen from Table 1, the photographic lens of the present invention has a distance τ from the telephoto point (τ is the object side from the first lens L1. i face to the length of the imaging surface), this value can be below 1·15, and compared with the original technology, it proves that the invention can achieve the miniaturization requirement; and, regarding the incident angle characteristic part, the incident The angle α (maximum incident angle to the camera element) can be below 25 degrees, and can also be well ensured; that is, with regard to the incident angle characteristic: it is necessary that the chief ray is inclined within 15 degrees and the lens is emitted into the camera element. However, with the advancement of the field of the camera element (the shape change of the Macro lens), the incident angle α is about 25 degrees, which is acceptable, but the angle of the corner is 63 degrees regardless of which embodiment; For example, it can be ensured that the efficacy of the present invention is sufficient. 16 1323359 As described above, the innovative structural design of the present invention is a photographic lens group which is sequentially arranged from the object side as an aperture, a first lens, a second lens and a third lens arrangement, and the first lens is convexly facing the object side. Positive lenticular lens, the second lens is convexly facing the image

側的負凹凸透鏡.第三鏡片是凸面向著物側的正凹凸透鏡.這3 片鏡片的兩面都是非球面的塑膠鏡片所形成，當f是全系焦點距離、f,是第一鏡片的焦點距離、f 2是第二鏡片的焦點距離時要滿足 0.7< f i/f <0.9 及—3.5< f2/f〈―12 的條件式，藉此能有效小型化，並產生較小的望遠比，且能以3片攝影鏡片就確保晝角；所以本發明之『具有產業之可利用性』應已毋庸置疑，除此之外，在本案實施朗揭露ϋ的特徵技術於申明之4並未曾見於諸刊物，亦未曾被公開使用，不作 ^有如上所述功朗進之事實，更具有不可輕忽_加功效:The negative lens of the side. The third lens is a positive meniscus lens that is convexly facing the object side. The three lenses are formed by aspherical plastic lenses on both sides. When f is the focal length of the whole system, f is the first lens. When the focal length and f 2 are the focal lengths of the second lens, the conditional formula of 0.7 < fi/f < 0.9 and -3.5 < f2 / f < -12 is satisfied, whereby the miniaturization can be effectively performed and the generation is small. The telephoto ratio can be ensured by three photographic lenses; therefore, the "industry availability" of the present invention should be unquestionable. In addition, the characteristics of the technology disclosed in this case are disclosed in the statement. 4 I have never seen it in various publications, and I have never used it publicly. I don’t have the fact that I have the merits mentioned above, and I have to be negligent.

疋故，本發明的『新穎性』以及『進步性』都已符合專利法規提峻料利之帽，祈請惠料查並早日賜准專利j 貰感德便。 u 17 1323359 ·- 【圖式簡單說明】第1 A圖實施例1的鏡片構成示意圖；第1B圖實施例1的收差圖及光學系特性資料示意圖；第2 A圖實施例2的鏡片構成示意圖；第2B圖實施例2的收差圖及光學系特性資料示意圖；第3 A圖實施例3的鏡片構成示意圖； φ 第3 B圖實施例3的收差圖及光學系特性資料示意圖；第4 A圖實施例4的鏡片構成示意圖；第4 B圖實施例4的收差圖及光學系特性資料示意圖；第5 A圖實施例5的鏡片構成示意圖；第5 B圖實施例5的收差圖及光學系特性資料示意圖；第6 A圖實施例6的鏡片構成示意圖；第6 B圖實施例6的收差圖及光學系特性資料示意圖； • 第7 A圖實施例7的鏡片構成示意圖；第7 B圖實施例7的收差圖及光學系特性資料示意圖；第8 A圖實施例8的鏡片構成示意圖；第8 B圖實施例8的收差圖及光學系特性資料示意圖；第9 A圖實施例1〜實施例3的非球面係數示意圖；第9 B圖實施例4〜實施例6的非球面係數示意圖；第9 C圖實施例7〜實施例8的非球面係數示意圖。 18 1323359 表一本發明條件式參數。【主要元件符號說明】 10 光圈 2 0 平行平面玻璃 3 0 成像面 L 1 第一鏡片 L 2 第二鏡片 L 3 第三鏡片 19Therefore, the "novelty" and "progressiveness" of the present invention have met the patent regulations and raised the hat of the material, and prayed for the benefit of the inspection and the early grant of the patent j. u 17 1323359 ·- [Simplified description of the drawings] FIG. 1A is a schematic view showing the configuration of the lens of the first embodiment; FIG. 1B is a schematic diagram of the difference diagram and the optical characteristic data of the first embodiment; FIG. 2B is a schematic diagram of the difference diagram and the optical system characteristic data of the second embodiment; FIG. 3A is a schematic diagram of the lens configuration of the third embodiment; FIG. 3B is a schematic diagram of the difference diagram and the optical system characteristic data of the third embodiment; 4A is a schematic diagram of the lens configuration of the embodiment 4; FIG. 4B is a schematic diagram of the difference diagram and the optical system characteristic data of the embodiment 4; FIG. 5A is a schematic diagram of the lens configuration of the embodiment 5; Schematic diagram of the difference diagram and the optical system characteristic data; FIG. 6A is a schematic diagram of the lens configuration of the embodiment 6; FIG. 6B is a schematic diagram of the difference diagram and the optical system characteristic data of the embodiment 6; FIG. 7B is a schematic diagram of the difference diagram and optical system characteristic data of Embodiment 7; FIG. 8A is a schematic diagram of the lens configuration of Embodiment 8; FIG. 8B is a schematic diagram of the difference diagram and optical system characteristic data of Embodiment 8. ; Figure 9A, Embodiment 1 to Embodiment 3 Schematic aspherical coefficients; Example 9 B of FIG schematic aspherical coefficients of Example 4 ~ 6 embodiment; aspherical coefficients July to Example 8 Example 9 C schematic of FIG embodiment. 18 1323359 Table 1 Conditional parameters of the invention. [Main component symbol description] 10 Aperture 2 0 Parallel plane glass 3 0 Imaging surface L 1 First lens L 2 Second lens L 3 Third lens 19

Claims

1323359 - X. Patent application scope: 1. A photographic lens group comprising an aperture, a first lens, a second lens and a third lens arranged in sequence from the object side, wherein: the first lens is convexly facing the object side a positive concave-convex plastic lens; the second lens is a negative concave-convex plastic lens convexly facing the image side; the third lens is a positive concave-convex plastic lens convexly facing the object side, and both sides of the lens are aspherical surfaces, when f is The focal length of the whole system, f, is the focal point distance of the first lens, and f 2 is the focal distance of the second lens; satisfies 〇..7< fi/f <0. 9 and -3· 5< f 2/ f < a condition of 1. 2 . 2. The photographic lens set according to claim 1, wherein when d2 is the interval between the first lens and the second lens, the condition of 〇. 1〇<d2//f <0.25 is satisfied. 3. The photographic lens set according to claim 1, wherein R| is the radius of curvature of the object side of the first lens, and R2 is the radius of curvature of the image side of the first lens, satisfying 0. 20 < Ri / R2<〇. 55. 4. The photographic lens set according to claim 2, wherein, when R1 is the object side radius of curvature of the first lens, R2 is the image side curvature radius of the first lens, satisfying 0. 20 < Ri / R2 < 〇. 55. 5. The photographic lens set according to claim 1, wherein when r3 is the object side curvature radius of the 2031323359 " 2 lens, R4 is the image side curvature radius of the second lens, satisfying 〇. 6 <;R3/R4<0. 8 conditions. 6. The photographic lens set according to claim 2, wherein, when R3 is the object side radius of curvature 'R4 of the second lens, the image side curvature radius of the second lens satisfies 〇. 6 < R3 /R_4< 0. 8 conditions. The photographic lens group according to the third aspect of the invention, wherein R3 is the object side radius of curvature of the first lens, and R4 is the image side curvature radius of the second lens, satisfying 〇. 6 < The condition of R3/R4<0. 8. 8. The photographic lens set according to claim 4, wherein, when R3 is the object side radius of curvature of the second lens, R4 is the image side curvature radius of the second lens, satisfying 〇. 6 <R3/R4<; 0. 8 conditions. 9. The photographic lens set according to claim 1, wherein when R5 is the object side radius of curvature of the third lens, the conditional expression & 6 < R5 / /: f < 丨 ^ is satisfied. 10. The photographic lens group according to claim 2, wherein, when Rs is the object side radius of curvature of the second lens, the conditional expression 〇. 6 < R5/f < 丨 ^ is satisfied. 。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。. The photographic lens set according to claim 4, wherein R5 is the radius of curvature of the object side of the third lens, and satisfies the conditional expression of 0.6; < R5/f <1.1. 13. The photographic lens set according to claim 5, wherein R5 is the object side radius of curvature of the third lens, and satisfies the conditional expression of 0.6; < R5/f < 1.1. 14. The photographic lens set according to claim 6, wherein R5 is the radius of curvature of the object side of the third lens, and satisfies the conditional expression of 0.6 and < R5/f < 1.1. 15. The photographic lens set according to claim 7, wherein when R5 is the object side radius of curvature of the third lens, the conditional expression 0.6 < R5/f < 1.1 is satisfied. 16. The photographic lens set according to claim 8, wherein when R5 is the object side radius of curvature of the third lens, the conditional expression 0.6 < R5/f < 1.1 is satisfied. 17. The photographic lens group as described in claim 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 or 16 wherein 12 is the combined focal length of the first and second lenses, satisfying the condition of 1.0 << 1.4. 22 1323359 18. The photographic lens set of claim 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 or 16 wherein F3。 The focal length of the third lens, satisfying a 0. 5 < f2 /; f3 < 0. 0 condition.

twenty three