TW202014754A - Three-piece compact optical lens system - Google Patents
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本發明係與鏡片組有關，特別是指一種應用於電子產品上的三片式薄型成像鏡片組。The invention relates to a lens group, in particular to a three-piece thin imaging lens group applied to electronic products.
以每個生物獨有的生物特徵作為根據的生物辨識(Biometric)系統，因其具有唯一性、普遍性、永久性、可測性、方便性、接受性、及不可欺性等，因此常被使用在目前市面上現有的行動裝置上，甚至亦可使用在未來的電子裝置上。然而，目前行動裝置所搭配的生物辨識系統多採用電容原理，其雖然可以降低生物辨識系統所需的體積，但是電路結構過於複雜，使得製造成本過高，相對的產品單價也偏高。The biometric system based on the unique biological characteristics of each creature is unique, universal, permanent, measurable, convenient, acceptable, and non-deceptive, etc. It can be used on existing mobile devices currently on the market, or even on future electronic devices. However, the biometric identification systems currently used in mobile devices mostly use the capacitive principle. Although the volume required by the biometric identification system can be reduced, the circuit structure is too complicated, which makes the manufacturing cost too high and the relative product unit price is also high.
目前雖然有利用光學成像原理的傳統生物辨識系統，如指紋辨識、靜脈辨識等，但傳統生物辨識系統存在體積過大的問題，使得搭載有生物辨識系統的電子裝置不易小型化，也更不易攜帶。At present, although there are traditional biometric systems using optical imaging principles, such as fingerprint identification and vein identification, the traditional biometric system has a problem of being too large, making it difficult for electronic devices equipped with the biometric system to be miniaturized and more difficult to carry.
有鑑於此，如何提供一種薄型成像鏡片組，可以作為生物辨識系統之用並可搭載在電子裝置上，使該電子裝置可小型化以便於攜帶即是目前急欲克服之技術瓶頸。In view of this, how to provide a thin imaging lens set can be used as a biometric system and can be mounted on an electronic device, so that the electronic device can be miniaturized for easy portability, which is a technical bottleneck that is currently eager to overcome.
本發明的目的在於提供一種三片式薄型成像鏡片組，尤指一種有助於縮減被攝物與三片式薄型成像鏡片組的距離，可有效縮小體積，維持其小型化的三片式薄型成像鏡片組。The object of the present invention is to provide a three-piece thin imaging lens group, in particular to a three-piece thin type which helps to reduce the distance between the subject and the three-piece thin imaging lens group, which can effectively reduce the volume and maintain its miniaturization Imaging lens group.
本發明另一目的在於提供一種三片式薄型成像鏡片組，尤指一種有效蒐集大角度之光線，而令三片式薄型成像鏡片組在極短物距內接收更大範圍之影像與達成辨識功效的三片式薄型成像鏡片組。Another object of the present invention is to provide a three-piece thin imaging lens group, especially an effective collection of light at a large angle, so that the three-piece thin imaging lens group can receive a larger range of images and achieve identification within an extremely short object distance Efficient three-piece thin imaging lens group.
為了達成前述目的，依據本發明所提供之一種三片式薄型成像鏡片組，由物侧至像侧依序包含：一平板元件，為玻璃材質；一第一透鏡，具有負屈折力，其物側表面近光軸處為凹面，其物側表面與像側表面至少一表面為非球面；一光圈；一第二透鏡，具有正屈折力，其物側表面近光軸處為凸面，其像側表面近光軸處為凸面，其物側表面與像側表面至少一表面為非球面；以及一第三透鏡，具有正屈折力，其物側表面與像側表面至少一表面為非球面；In order to achieve the foregoing objective, a three-piece thin imaging lens set according to the present invention includes, in order from the object side to the image side, a flat element made of glass; a first lens with negative refractive power The side surface is concave at the near-optical axis, at least one of the object-side surface and the image-side surface is aspheric; an aperture; a second lens, having a positive refractive power, and the object-side surface is a convex surface at the near-optical axis, and its image The side surface is convex near the optical axis, and at least one of its object-side surface and image-side surface is aspheric; and a third lens has positive refractive power, and at least one of its object-side surface and image-side surface is aspheric;
其中該三片式薄型成像鏡片組中具屈折力的透鏡為三片，該三片式薄型成像鏡片組中最大視場角為FOV，一被攝物至一成像面於光軸上的距離為OTL，該三片式薄型成像鏡片組的整體焦距為f，該第一透鏡的焦距為f1，該第二透鏡的焦距為f2，該第三透鏡的焦距為f3，並滿足下列條件：90度 ＜ FOV ＜ 140度；2公厘 ＜ OTL ＜ 6公厘；0.2 ＜ | f/(f1×f2×f3) | ＜ 0.7。Among them, the three-piece thin imaging lens group has three refractive lenses. The maximum field angle of the three-piece thin imaging lens group is FOV, and the distance between an object and an imaging surface on the optical axis is OTL, the overall focal length of the three-piece thin imaging lens group is f, the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, and the following conditions are satisfied: 90 degrees <FOV <140 degrees; 2 mm <OTL <6 mm; 0.2 <| f/(f1×f2×f3) | <0.7.
較佳地，其中該三片式薄型成像鏡片組的整體焦距為f，該第一透鏡的焦距為f1，並滿足下列條件：-0.7 ＜ f/f1 ＜ -0.1。藉此，可平衡三片式薄型成像鏡片組的屈折力配置，以有效修正三片式薄型成像鏡片組的像差，同時降低三片式薄型成像鏡片組的敏感度。Preferably, the overall focal length of the three-piece thin imaging lens group is f, and the focal length of the first lens is f1, and the following conditions are satisfied: -0.7 <f/f1 <-0.1. In this way, the refractive power configuration of the three-piece thin imaging lens group can be balanced to effectively correct the aberration of the three-piece thin imaging lens group while reducing the sensitivity of the three-piece thin imaging lens group.
較佳地，其中該三片式薄型成像鏡片組的整體焦距為f，該第二透鏡的焦距為f2，並滿足下列條件：0.1 ＜ f/f2 ＜ 0.75。藉此，可平衡三片式薄型成像鏡片組的屈折力配置，以有效修正三片式薄型成像鏡片組的像差，同時降低三片式薄型成像鏡片組的敏感度。Preferably, the overall focal length of the three-piece thin imaging lens group is f, and the focal length of the second lens is f2, and the following conditions are satisfied: 0.1 <f/f2 <0.75. In this way, the refractive power configuration of the three-piece thin imaging lens group can be balanced to effectively correct the aberration of the three-piece thin imaging lens group while reducing the sensitivity of the three-piece thin imaging lens group.
較佳地，其中該三片式薄型成像鏡片組的整體焦距為f，該第三透鏡的焦距為f3，並滿足下列條件：0.07 ＜ f/f3 ＜ 0.68。藉此，可平衡三片式薄型成像鏡片組的屈折力配置，以有效修正三片式薄型成像鏡片組的像差，同時降低三片式薄型成像鏡片組的敏感度。Preferably, the overall focal length of the three-piece thin imaging lens group is f, and the focal length of the third lens is f3, and the following conditions are satisfied: 0.07 <f/f3 <0.68. In this way, the refractive power configuration of the three-piece thin imaging lens group can be balanced to effectively correct the aberration of the three-piece thin imaging lens group while reducing the sensitivity of the three-piece thin imaging lens group.
較佳地，其中該三片式薄型成像鏡片組的整體焦距為f，該第二透鏡與第三透鏡的合成焦距為f23，並滿足下列條件：0.4 ＜ f/f23 ＜ 1.0。藉此，該三片式薄型成像鏡片組可於縮短光學總長與修正像差之間取得平衡。Preferably, the overall focal length of the three-piece thin imaging lens group is f, the combined focal length of the second lens and the third lens is f23, and the following conditions are satisfied: 0.4 <f/f23 <1.0. In this way, the three-piece thin imaging lens set can achieve a balance between shortening the total optical length and correcting aberrations.
較佳地，其中該第一透鏡的焦距為f1，該第二透鏡與第三透鏡的合成焦距為f23，並滿足下列條件：-2.9 ＜ f1/f23 ＜ -1.0。藉此，該三片式薄型成像鏡片組的解像能力顯著提昇。Preferably, wherein the focal length of the first lens is f1, the combined focal length of the second lens and the third lens is f23, and the following conditions are satisfied: -2.9 <f1/f23 <-1.0. With this, the resolution capability of the three-piece thin imaging lens group is significantly improved.
較佳地，其中該第一透鏡的焦距為f1，該第一透鏡物側表面的曲率半徑為R1，並滿足下列條件：0.6 ＜ f1/R1 ＜ 2.4。藉此，可有利於降低失真。Preferably, wherein the focal length of the first lens is f1, the radius of curvature of the object-side surface of the first lens is R1, and the following conditions are satisfied: 0.6 <f1/R1 <2.4. This can help reduce distortion.
較佳地，其中該第一透鏡的焦距為f1，該第一透鏡像側表面的曲率半徑為R2，並滿足下列條件：-1.0 ＜ f1/R2 ＜ 0.6。藉此，第一透鏡像側表面的曲率較合適，有助於縮短三片式薄型成像鏡片組的總長度。Preferably, wherein the focal length of the first lens is f1, the radius of curvature of the image-side surface of the first lens is R2, and the following conditions are satisfied: -1.0 <f1/R2 <0.6. In this way, the curvature of the image side surface of the first lens is appropriate, which helps to shorten the total length of the three-piece thin imaging lens group.
較佳地，其中該第二透鏡的焦距為f2，該第二透鏡物側表面的曲率半徑為R3，並滿足下列條件：0.2 ＜ f2/R3 ＜ 1.6。藉此，將有助於降低系統敏感度，可有效地提高生產良率。Preferably, wherein the focal length of the second lens is f2, the radius of curvature of the object-side surface of the second lens is R3, and the following conditions are satisfied: 0.2 <f2/R3 <1.6. This will help reduce system sensitivity and effectively increase production yield.
較佳地，其中該第二透鏡的焦距為f2，該第二透鏡像側表面的曲率半徑為R4，並滿足下列條件：-1.8 ＜ f2/R4 ＜ -0.4。藉此，可進一步減緩第二透鏡像側表面之周邊曲率，更能實現降低雜散光的特性。Preferably, wherein the focal length of the second lens is f2, the radius of curvature of the image-side surface of the second lens is R4, and the following conditions are satisfied: -1.8 <f2/R4 <-0.4. With this, the peripheral curvature of the image-side surface of the second lens can be further reduced, and the characteristics of reducing stray light can be further achieved.
較佳地，其中該第三透鏡的焦距為f3，該第三透鏡物側表面的曲率半徑為R5，並滿足下列條件：-0.7 ＜ f3/R5 ＜ 2.7。藉此，修正成像的放大倍率。Preferably, wherein the focal length of the third lens is f3, the radius of curvature of the object-side surface of the third lens is R5, and the following conditions are satisfied: -0.7 <f3/R5 <2.7. By this, the magnification of imaging is corrected.
較佳地，其中該第三透鏡的焦距為f3，該第三透鏡像側表面的曲率半徑為R6，並滿足下列條件：-2.1 ＜ f3/R6 ＜ 1.0。藉此，修正成像的放大倍率。Preferably, wherein the focal length of the third lens is f3, the radius of curvature of the image side surface of the third lens is R6, and the following conditions are satisfied: -2.1 <f3/R6 <1.0. By this, the magnification of imaging is corrected.
較佳地，其中該第一透鏡物側表面的曲率半徑為R1，該第一透鏡像側表面的曲率半徑為R2，並滿足下列條件：-0.9 ＜ R1/R2 ＜ 0.6。藉此，可以降低三片式薄型成像鏡片組的球差與像散。Preferably, the radius of curvature of the object-side surface of the first lens is R1, and the radius of curvature of the image-side surface of the first lens is R2, and the following conditions are satisfied: -0.9 <R1/R2 <0.6. With this, the spherical aberration and astigmatism of the three-piece thin imaging lens group can be reduced.
較佳地，其中該第二透鏡物側表面的曲率半徑為R3，該第二透鏡像側表面的曲率半徑為R4，並滿足下列條件：-3.2 ＜ R3/R4 ＜ -0.1。藉此，可以降低三片式薄型成像鏡片組的像散。Preferably, the radius of curvature of the object-side surface of the second lens is R3, and the radius of curvature of the image-side surface of the second lens is R4, and the following conditions are satisfied: -3.2 <R3/R4 <-0.1. With this, the astigmatism of the three-piece thin imaging lens group can be reduced.
較佳地，其中該第三透鏡物側表面的曲率半徑為R5，該第三透鏡像側表面的曲率半徑為R6，並滿足下列條件：-95 ＜ R5/R6 ＜ 10。藉此，有效平衡第三透鏡表面的曲率配置，以在視場角度與總長間取得平衡。Preferably, the radius of curvature of the object-side surface of the third lens is R5, and the radius of curvature of the image-side surface of the third lens is R6, and the following conditions are satisfied: -95 <R5/R6 <10. In this way, the curvature configuration of the third lens surface is effectively balanced to achieve a balance between the angle of view and the total length.
較佳地，其中該三片式薄型成像鏡片組的整體焦距為f，該被攝物至成像面於光軸上的距離為OTL，並滿足下列條件：8.0 ＜ OTL/f ＜ 18.0。藉此，可有利於維持該三片式薄型成像鏡片組的小型化及長焦點，以搭載於輕薄的電子產品上。Preferably, the overall focal length of the three-piece thin imaging lens group is f, the distance from the subject to the imaging surface on the optical axis is OTL, and the following conditions are satisfied: 8.0 <OTL/f <18.0. In this way, it is advantageous to maintain the miniaturization and long focus of the three-piece thin imaging lens group, so as to be mounted on thin and light electronic products.
較佳地，其中該第一透鏡的焦距為f1，該第二透鏡的焦距為f2，該第三透鏡的焦距為f3，並滿足下列條件：-2.4 ＜ (f1+f2+f3)/( f1×f2×f3) ＜ -0.1。藉此，可以讓被攝物在短物距上以小像差及高相對照度，良好的成像於成像面上。Preferably, wherein the focal length of the first lens is f1, the focal length of the second lens is f2, and the focal length of the third lens is f3, and the following conditions are satisfied: -2.4 <(f1+f2+f3)/( f1 ×f2×f3) <-0.1. In this way, the subject can be imaged on the imaging surface with a small aberration and high relative illumination at a short object distance.
有關本發明為達成上述目的，所採用之技術、手段及其他之功效，茲舉八較佳可行實施例並配合圖式詳細說明如後。Regarding the techniques, means and other effects adopted by the present invention to achieve the above-mentioned objectives, eight preferred feasible embodiments are described in detail below with reference to the drawings.
＜第一實施例＞<First embodiment>
請參照圖1A、圖1B及圖1C，其中圖1A繪示依照本發明第一實施例之三片式薄型成像鏡片組的示意圖，圖1B為圖1A的局部放大圖。圖1C由左至右依序為第一實施例的三片式薄型成像鏡片組的像面彎曲及歪曲收差曲線圖。由圖1A及圖1B可知，三片式薄型成像鏡片組由物側至像側依序包含平板元件160、第一透鏡110、光圈100、第二透鏡120、第三透鏡130、紅外線濾除濾光片170、以及成像面180，其中該三片式薄型成像鏡片組中具屈折力的透鏡為三片(110、120、130)。該光圈100設置在該第一透鏡110與第二透鏡120之間。Please refer to FIGS. 1A, 1B and 1C, wherein FIG. 1A is a schematic diagram of a three-piece thin imaging lens set according to the first embodiment of the present invention, and FIG. 1B is a partially enlarged view of FIG. 1A. FIG. 1C is a graph of the curvature of curvature and distortion of the image plane of the three-piece thin imaging lens group of the first embodiment from left to right. As can be seen from FIGS. 1A and 1B, the three-piece thin imaging lens set includes a
該平板元件160為玻璃材質，其設置於一被攝物O及該第一透鏡110之間，且不影響該三片式薄型成像鏡片組的焦距。The
該第一透鏡110具有負屈折力，且為塑膠材質，其物側表面111近光軸190處為凹面，其像側表面112近光軸190處為凸面，且該物側表面111及像側表面112皆為非球面。The
該第二透鏡120具有正屈折力，且為塑膠材質，其物側表面121近光軸190處為凸面，其像側表面122近光軸190處為凸面，且該物側表面121及像側表面122皆為非球面。The
該第三透鏡130具有正屈折力，且為塑膠材質，其物側表面131近光軸190處為凸面，其像側表面132近光軸190處為凸面，且該物側表面131及像側表面132皆為非球面。The
該紅外線濾除濾光片170為玻璃材質，其設置於該第三透鏡130及成像面180間且不影響該三片式薄型成像鏡片組的焦距。The
其中z為沿光軸190方向在高度為h的位置以表面頂點作參考的位置值；c是透鏡表面靠近光軸190的曲率，並為曲率半徑(R)的倒數(c=1/R)，R為透鏡表面靠近光軸190的曲率半徑，h是透鏡表面距離光軸190的垂直距離，k為圓錐係數（conic constant），而A、B、C、D、E、F、G、……為高階非球面係數。Where z is the position value along the
第一實施例的三片式薄型成像鏡片組中，三片式薄型成像鏡片組的焦距為f，三片式薄型成像鏡片組的光圈值(f-number)為Fno，三片式薄型成像鏡片組中最大視場角(畫角)為FOV，其數值如下：f= 0.37(公厘)；Fno=1.35；以及FOV= 105.0(度)。In the three-piece thin imaging lens group of the first embodiment, the focal length of the three-piece thin imaging lens group is f, the aperture value (f-number) of the three-piece thin imaging lens group is Fno, and the three-piece thin imaging lens group The maximum field angle (drawing angle) in the group is FOV, and its values are as follows: f = 0.37 (mm); Fno = 1.35; and FOV = 105.0 (degrees).
第一實施例的三片式薄型成像鏡片組中，該三片式薄型成像鏡片組的焦距為f，該第一透鏡110的焦距為f1，該第二透鏡120的焦距為f2，該第三透鏡130的焦距為f3，並滿足下列條件：| f/(f1×f2×f3) | = 0.38。In the three-piece thin imaging lens group of the first embodiment, the focal length of the three-piece thin imaging lens group is f, the focal length of the
第一實施例的三片式薄型成像鏡片組中，該三片式薄型成像鏡片組的焦距為f，該第一透鏡110的焦距為f1，並滿足下列條件： f/f1 = -0.32。In the three-piece thin imaging lens group of the first embodiment, the focal length of the three-piece thin imaging lens group is f, and the focal length of the
第一實施例的三片式薄型成像鏡片組中，該三片式薄型成像鏡片組的焦距為f，該第二透鏡120的焦距為f2，並滿足下列條件： f/f2 = 0.53。In the three-piece thin imaging lens group of the first embodiment, the focal length of the three-piece thin imaging lens group is f, and the focal length of the
第一實施例的三片式薄型成像鏡片組中，該三片式薄型成像鏡片組的焦距為f，該第三透鏡130的焦距為f3，並滿足下列條件： f/f3 = 0.32。In the three-piece thin imaging lens group of the first embodiment, the focal length of the three-piece thin imaging lens group is f, and the focal length of the
第一實施例的三片式薄型成像鏡片組中，該三片式薄型成像鏡片組的焦距為f，該第二透鏡120與第三透鏡130的合成焦距為f23，並滿足下列條件： f/f23 = 0.75。In the three-piece thin imaging lens group of the first embodiment, the focal length of the three-piece thin imaging lens group is f, the combined focal length of the
第一實施例的三片式薄型成像鏡片組中，該第一透鏡110的焦距為f1，該第二透鏡120與第三透鏡130的合成焦距為f23，並滿足下列條件： f1/f23 = -2.38。In the three-piece thin imaging lens group of the first embodiment, the focal length of the
第一實施例的三片式薄型成像鏡片組中，該第一透鏡110的焦距為f1，該第一透鏡110物側表面111的曲率半徑為R1，並滿足下列條件： f1/R1 = 1.86。In the three-piece thin imaging lens group of the first embodiment, the focal length of the
第一實施例的三片式薄型成像鏡片組中，該第一透鏡110的焦距為f1，該第一透鏡110像側表面112的曲率半徑為R2，並滿足下列條件： f1/R2 = 0.02。In the three-piece thin imaging lens group of the first embodiment, the focal length of the
第一實施例的三片式薄型成像鏡片組中，該第二透鏡120的焦距為f2，該第二透鏡120物側表面121的曲率半徑為R3，並滿足下列條件： f2/R3 = 0.83。In the three-piece thin imaging lens group of the first embodiment, the focal length of the
第一實施例的三片式薄型成像鏡片組中，該第二透鏡120的焦距為f2，該第二透鏡120像側表面122的曲率半徑為R4，並滿足下列條件： f2/R4 = -1.19。In the three-piece thin imaging lens group of the first embodiment, the focal length of the
第一實施例的三片式薄型成像鏡片組中，該第三透鏡130的焦距為f3，該第三透鏡130物側表面131的曲率半徑為R5，並滿足下列條件： f3/R5 = 0.86。In the three-piece thin imaging lens group of the first embodiment, the focal length of the
第一實施例的三片式薄型成像鏡片組中，該第三透鏡130的焦距為f3，該第三透鏡130像側表面132的曲率半徑為R6，並滿足下列條件： f3/R6 = -0.75。In the three-piece thin imaging lens group of the first embodiment, the focal length of the
第一實施例的三片式薄型成像鏡片組中，該第一透鏡110物側表面111的曲率半徑為R1，該第一透鏡110像側表面112的曲率半徑為R2，並滿足下列條件： R1/R2 = 0.01。In the three-piece thin imaging lens group of the first embodiment, the radius of curvature of the object-
第一實施例的三片式薄型成像鏡片組中，該第二透鏡120物側表面121的曲率半徑為R3，該第二透鏡120像側表面122的曲率半徑為R4，並滿足下列條件： R3/R4 = -1.42。In the three-piece thin imaging lens group of the first embodiment, the radius of curvature of the object-
第一實施例的三片式薄型成像鏡片組中，該第三透鏡130物側表面131的曲率半徑為R5，該第三透鏡130像側表面132的曲率半徑為R6，並滿足下列條件： R5/R6 = -0.86。In the three-piece thin imaging lens group of the first embodiment, the radius of curvature of the object-
第一實施例的三片式薄型成像鏡片組中，該三片式薄型成像鏡片組的整體焦距為f，該被攝物O至該成像面180於光軸190上的距離為OTL，並滿足下列條件： OTL/f = 13.30。In the three-piece thin imaging lens group of the first embodiment, the overall focal length of the three-piece thin imaging lens group is f, and the distance from the subject O to the
再配合參照下列表1及表2。Refer to Table 1 and Table 2 below.
表1為圖1A及圖1B第一實施例詳細的結構數據，其中曲率半徑、厚度及焦距的單位為mm，且表面0-12依序表示由物側至像側的表面。表2為第一實施例中的非球面數據，其中，k表非球面曲線方程式中的錐面係數，A、B、C、D、E、F、G、……為高階非球面係數。此外，以下各實施例表格乃對應各實施例的示意圖與像差曲線圖，表格中數據的定義皆與第一實施例的表1、及表2的定義相同，在此不加贅述。Table 1 is the detailed structural data of the first embodiment of FIGS. 1A and 1B, in which the units of radius of curvature, thickness and focal length are mm, and surfaces 0-12 sequentially represent the surfaces from the object side to the image side. Table 2 is aspheric data in the first embodiment, where k represents the conical coefficient in the aspheric curve equation, and A, B, C, D, E, F, G, ... are high-order aspheric coefficients. In addition, the tables in the following embodiments correspond to the schematic diagrams and aberration curves of the embodiments. The definitions of the data in the tables are the same as those in Table 1 and Table 2 of the first embodiment, and are not repeated here.
＜第二實施例＞<Second embodiment>
請參照圖2A、圖2B及圖2C，其中圖2A繪示依照本發明第二實施例之三片式薄型成像鏡片組的示意圖，圖2B為圖2A的局部放大圖。圖2C由左至右依序為第二實施例的三片式薄型成像鏡片組的像面彎曲及歪曲收差曲線圖。由圖2A及圖2B可知，三片式薄型成像鏡片組由物側至像側依序包含平板元件260、第一透鏡210、光圈200、第二透鏡220、第三透鏡230、紅外線濾除濾光片270、以及成像面280，其中該三片式薄型成像鏡片組中具屈折力的透鏡為三片(210、220、230)。該光圈200設置在該第一透鏡210與第二透鏡220之間。Please refer to FIGS. 2A, 2B and 2C, wherein FIG. 2A is a schematic diagram of a three-piece thin imaging lens assembly according to a second embodiment of the present invention, and FIG. 2B is a partially enlarged view of FIG. 2A. FIG. 2C is a graph of the curvature of curvature and distortion of the image plane of the three-piece thin imaging lens group of the second embodiment in order from left to right. As can be seen from FIGS. 2A and 2B, the three-piece thin imaging lens set includes a
該平板元件260為玻璃材質，其設置於一被攝物O及該第一透鏡210之間，且不影響該三片式薄型成像鏡片組的焦距。The
該第一透鏡210具有負屈折力，且為塑膠材質，其物側表面211近光軸290處為凹面，其像側表面212近光軸290處為凸面，且該物側表面211及像側表面212皆為非球面。The
該第二透鏡220具有正屈折力，且為塑膠材質，其物側表面221近光軸290處為凸面，其像側表面222近光軸290處為凸面，且該物側表面221及像側表面222皆為非球面。The
該第三透鏡230具有正屈折力，且為塑膠材質，其物側表面231近光軸290處為凸面，其像側表面232近光軸290處為凸面，且該物側表面231及像側表面232皆為非球面。The
該紅外線濾除濾光片270為玻璃材質，其設置於該第三透鏡230及成像面280間且不影響該三片式薄型成像鏡片組的焦距。The
再配合參照下列表3、以及表4。Refer to Table 3 and Table 4 below.
第二實施例中，非球面的曲線方程式表示如第一實施例的形式。此外，下表參數的定義皆與第一實施例相同，在此不加以贅述。In the second embodiment, the curve equation of the aspherical surface is expressed as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and will not be repeated here.
配合表3、以及表4可推算出下列數據：Together with Table 3 and Table 4, the following data can be derived:
＜第三實施例＞<Third Embodiment>
請參照圖3A、圖3B及圖3C，其中圖3A繪示依照本發明第三實施例之三片式薄型成像鏡片組的示意圖，圖3B為圖3A的局部放大圖。圖3C由左至右依序為第三實施例的三片式薄型成像鏡片組的像面彎曲及歪曲收差曲線圖。由圖3A及圖3B可知，三片式薄型成像鏡片組由物側至像側依序包含平板元件360、第一透鏡310、光圈300、第二透鏡320、第三透鏡330、紅外線濾除濾光片370、以及成像面380，其中該三片式薄型成像鏡片組中具屈折力的透鏡為三片(310、320、330)。該光圈300設置在該第一透鏡310與第二透鏡320之間。Please refer to FIGS. 3A, 3B and 3C, wherein FIG. 3A is a schematic diagram of a three-piece thin imaging lens set according to a third embodiment of the present invention, and FIG. 3B is a partially enlarged view of FIG. 3A. FIG. 3C is a graph of the curvature of curvature and distortion of the image plane of the three-piece thin imaging lens group of the third embodiment from left to right. As can be seen from FIGS. 3A and 3B, the three-piece thin imaging lens set includes a
該平板元件360為玻璃材質，其設置於一被攝物O及該第一透鏡310之間，且不影響該三片式薄型成像鏡片組的焦距。The
該第一透鏡310具有負屈折力，且為塑膠材質，其物側表面311近光軸390處為凹面，其像側表面312近光軸390處為凹面，且該物側表面311及像側表面312皆為非球面。The
該第二透鏡320具有正屈折力，且為塑膠材質，其物側表面321近光軸390處為凸面，其像側表面322近光軸390處為凸面，且該物側表面321及像側表面322皆為非球面。The
該第三透鏡330具有正屈折力，且為塑膠材質，其物側表面331近光軸390處為凸面，其像側表面332近光軸390處為凸面，且該物側表面331及像側表面332皆為非球面。The
該紅外線濾除濾光片370為玻璃材質，其設置於該第三透鏡330及成像面380間且不影響該三片式薄型成像鏡片組的焦距。The
再配合參照下列表5、以及表6。Refer to Table 5 and Table 6 below.
第三實施例中，非球面的曲線方程式表示如第一實施例的形式。此外，下表參數的定義皆與第一實施例相同，在此不加以贅述。In the third embodiment, the curve equation of the aspherical surface is expressed as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and will not be repeated here.
配合表5、以及表6可推算出下列數據：Together with Tables 5 and 6, the following data can be derived:
＜第四實施例＞<Fourth embodiment>
請參照圖4A、圖4B及圖4C，其中圖4A繪示依照本發明第四實施例之三片式薄型成像鏡片組的示意圖，圖4B為圖4A的局部放大圖。圖4C由左至右依序為第四實施例的三片式薄型成像鏡片組的像面彎曲及歪曲收差曲線圖。由圖4A及圖4B可知，三片式薄型成像鏡片組由物側至像側依序包含平板元件460、第一透鏡410、光圈400、第二透鏡420、第三透鏡430、紅外線濾除濾光片470、以及成像面480，其中該三片式薄型成像鏡片組中具屈折力的透鏡為三片(410、420、430)。該光圈400設置在該第一透鏡410與第二透鏡420之間。Please refer to FIGS. 4A, 4B and 4C, wherein FIG. 4A is a schematic diagram of a three-piece thin imaging lens assembly according to a fourth embodiment of the present invention, and FIG. 4B is a partially enlarged view of FIG. 4A. FIG. 4C is a graph of the curvature of curvature and distortion of the image plane of the three-piece thin imaging lens group of the fourth embodiment in order from left to right. As can be seen from FIGS. 4A and 4B, the three-piece thin imaging lens set includes a
該平板元件460為玻璃材質，其設置於一被攝物O及該第一透鏡410之間，且不影響該三片式薄型成像鏡片組的焦距。The
該第一透鏡410具有負屈折力，且為塑膠材質，其物側表面411近光軸490處為凹面，其像側表面412近光軸490處為凹面，且該物側表面411及像側表面412皆為非球面。The
該第二透鏡420具有正屈折力，且為塑膠材質，其物側表面421近光軸490處為凸面，其像側表面422近光軸490處為凸面，且該物側表面421及像側表面422皆為非球面。The
該第三透鏡430具有正屈折力，且為塑膠材質，其物側表面431近光軸490處為凸面，其像側表面432近光軸490處為凸面，且該物側表面431及像側表面432皆為非球面。The
該紅外線濾除濾光片470為玻璃材質，其設置於該第三透鏡430及成像面480間且不影響該三片式薄型成像鏡片組的焦距。The
再配合參照下列表7、以及表8。Refer to Table 7 and Table 8 below.
第四實施例中，非球面的曲線方程式表示如第一實施例的形式。此外，下表參數的定義皆與第一實施例相同，在此不加以贅述。In the fourth embodiment, the curve equation of the aspherical surface is expressed as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and will not be repeated here.
配合表7、以及表8可推算出下列數據：Together with Table 7 and Table 8, the following data can be calculated:
＜第五實施例＞<Fifth Embodiment>
請參照圖5A、圖5B及圖5C，其中圖5A繪示依照本發明第五實施例之三片式薄型成像鏡片組的示意圖，圖5B為圖5A的局部放大圖。圖5C由左至右依序為第五實施例的三片式薄型成像鏡片組的像面彎曲及歪曲收差曲線圖。由圖5A及圖5B可知，三片式薄型成像鏡片組由物側至像側依序包含平板元件560、第一透鏡510、光圈500、第二透鏡520、第三透鏡530、紅外線濾除濾光片570、以及成像面580，其中該三片式薄型成像鏡片組中具屈折力的透鏡為三片(510、520、530)。該光圈500設置在該第一透鏡510與第二透鏡520之間。Please refer to FIGS. 5A, 5B and 5C, wherein FIG. 5A is a schematic diagram of a three-piece thin imaging lens assembly according to a fifth embodiment of the present invention, and FIG. 5B is a partially enlarged view of FIG. 5A. FIG. 5C is a graph of the curvature of curvature and distortion of the image plane of the three-piece thin imaging lens group of the fifth embodiment from left to right. As can be seen from FIGS. 5A and 5B, the three-piece thin imaging lens group includes a
該平板元件560為玻璃材質，其設置於一被攝物O及該第一透鏡510之間，且不影響該三片式薄型成像鏡片組的焦距。The
該第一透鏡510具有負屈折力，且為塑膠材質，其物側表面511近光軸590處為凹面，其像側表面512近光軸590處為凸面，且該物側表面511及像側表面512皆為非球面。The
該第二透鏡520具有正屈折力，且為塑膠材質，其物側表面521近光軸590處為凸面，其像側表面522近光軸590處為凸面，且該物側表面521及像側表面522皆為非球面。The
該第三透鏡530具有正屈折力，且為塑膠材質，其物側表面531近光軸590處為凸面，其像側表面532近光軸590處為凸面，且該物側表面531及像側表面532皆為非球面。The
該紅外線濾除濾光片570為玻璃材質，其設置於該第三透鏡530及成像面580間且不影響該三片式薄型成像鏡片組的焦距。The
再配合參照下列表9、以及表10。Refer to Table 9 and Table 10 below.
第五實施例中，非球面的曲線方程式表示如第一實施例的形式。此外，下表參數的定義皆與第一實施例相同，在此不加以贅述。In the fifth embodiment, the curve equation of the aspherical surface is expressed as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and will not be repeated here.
配合表9、以及表10可推算出下列數據：Together with Tables 9 and 10, the following data can be calculated:
＜第六實施例＞<Sixth Embodiment>
請參照圖6A、圖6B及圖6C，其中圖6A繪示依照本發明第六實施例之三片式薄型成像鏡片組的示意圖，圖6B為圖6A的局部放大圖。圖6C由左至右依序為第六實施例的三片式薄型成像鏡片組的像面彎曲及歪曲收差曲線圖。由圖6A及圖6B可知，三片式薄型成像鏡片組由物側至像側依序包含平板元件660、第一透鏡610、光圈600、第二透鏡620、第三透鏡630、紅外線濾除濾光片670、以及成像面680，其中該三片式薄型成像鏡片組中具屈折力的透鏡為三片(610、620、630)。該光圈600設置在該第一透鏡610與第二透鏡620之間。Please refer to FIGS. 6A, 6B and 6C, wherein FIG. 6A is a schematic diagram of a three-piece thin imaging lens assembly according to a sixth embodiment of the present invention, and FIG. 6B is a partially enlarged view of FIG. 6A. FIG. 6C is a graph of the curvature of curvature and distortion of the image plane of the three-piece thin imaging lens group of the sixth embodiment from left to right. As can be seen from FIGS. 6A and 6B, the three-piece thin imaging lens group includes a
該平板元件660為玻璃材質，其設置於一被攝物O及該第一透鏡610之間，且不影響該三片式薄型成像鏡片組的焦距。The
該第一透鏡610具有負屈折力，且為塑膠材質，其物側表面611近光軸690處為凹面，其像側表面612近光軸690處為凹面，且該物側表面611及像側表面612皆為非球面。The
該第二透鏡620具有正屈折力，且為塑膠材質，其物側表面621近光軸690處為凸面，其像側表面622近光軸690處為凸面，且該物側表面621及像側表面622皆為非球面。The
該第三透鏡630具有正屈折力，且為塑膠材質，其物側表面631近光軸690處為凹面，其像側表面632近光軸690處為凸面，且該物側表面631及像側表面632皆為非球面。The
該紅外線濾除濾光片670為玻璃材質，其設置於該第三透鏡630及成像面680間且不影響該三片式薄型成像鏡片組的焦距。The
再配合參照下列表11、以及表12。Refer to Table 11 and Table 12 below.
第六實施例中，非球面的曲線方程式表示如第一實施例的形式。此外，下表參數的定義皆與第一實施例相同，在此不加以贅述。In the sixth embodiment, the curve equation of the aspherical surface is expressed as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and will not be repeated here.
配合表11、以及表12可推算出下列數據：Together with Table 11 and Table 12, the following data can be calculated:
＜第七實施例＞<Seventh Embodiment>
請參照圖7A、圖7B及圖7C，其中圖7A繪示依照本發明第七實施例之三片式薄型成像鏡片組的示意圖，圖7B為圖7A的局部放大圖。圖7C由左至右依序為第七實施例的三片式薄型成像鏡片組的像面彎曲及歪曲收差曲線圖。由圖7A及圖7B可知，三片式薄型成像鏡片組由物側至像側依序包含平板元件760、第一透鏡710、光圈700、第二透鏡720、第三透鏡730、紅外線濾除濾光片770、以及成像面780，其中該三片式薄型成像鏡片組中具屈折力的透鏡為三片(710、720、730)。該光圈700設置在該第一透鏡710與第二透鏡720之間。Please refer to FIGS. 7A, 7B and 7C, wherein FIG. 7A is a schematic diagram of a three-piece thin imaging lens assembly according to a seventh embodiment of the present invention, and FIG. 7B is a partially enlarged view of FIG. 7A. FIG. 7C is a graph of the curvature of curvature and distortion of the image plane of the three-piece thin imaging lens group of the seventh embodiment from left to right. As can be seen from FIGS. 7A and 7B, the three-piece thin imaging lens group includes a
該平板元件760為玻璃材質，其設置於一被攝物O及該第一透鏡710之間，且不影響該三片式薄型成像鏡片組的焦距。The
該第一透鏡710具有負屈折力，且為塑膠材質，其物側表面711近光軸790處為凹面，其像側表面712近光軸790處為凹面，且該物側表面711及像側表面712皆為非球面。The
該第二透鏡720具有正屈折力，且為塑膠材質，其物側表面721近光軸790處為凸面，其像側表面722近光軸790處為凸面，且該物側表面721及像側表面722皆為非球面。The
該第三透鏡730具有正屈折力，且為塑膠材質，其物側表面731近光軸790處為凸面，其像側表面732近光軸790處為凸面，且該物側表面731及像側表面732皆為非球面。The
該紅外線濾除濾光片770為玻璃材質，其設置於該第三透鏡730及成像面780間且不影響該三片式薄型成像鏡片組的焦距。The
再配合參照下列表13、以及表14。Refer to Table 13 and Table 14 below.
第七實施例中，非球面的曲線方程式表示如第一實施例的形式。此外，下表參數的定義皆與第一實施例相同，在此不加以贅述。In the seventh embodiment, the curve equation of the aspherical surface is expressed as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and will not be repeated here.
配合表13、以及表14可推算出下列數據：Together with Tables 13 and 14, the following data can be derived:
＜第八實施例＞<Eighth Embodiment>
請參照圖8A、圖8B及圖8C，其中圖8A繪示依照本發明第八實施例之三片式薄型成像鏡片組的示意圖，圖8B為圖8A的局部放大圖。圖8C由左至右依序為第八實施例的三片式薄型成像鏡片組的像面彎曲及歪曲收差曲線圖。由圖8A及圖8B可知，三片式薄型成像鏡片組由物側至像側依序包含平板元件860、第一透鏡810、光圈800、第二透鏡820、第三透鏡830、紅外線濾除濾光片870、以及成像面880，其中該三片式薄型成像鏡片組中具屈折力的透鏡為三片(810、820、830)。該光圈800設置在該第一透鏡810與第二透鏡820之間。Please refer to FIGS. 8A, 8B and 8C, wherein FIG. 8A is a schematic diagram of a three-piece thin imaging lens assembly according to an eighth embodiment of the present invention, and FIG. 8B is a partially enlarged view of FIG. 8A. FIG. 8C is a graph of the curvature of curvature and distortion of the image plane of the three-piece thin imaging lens group of the eighth embodiment from left to right. As can be seen from FIGS. 8A and 8B, the three-piece thin imaging lens set includes a
該平板元件860為玻璃材質，其設置於一被攝物O及該第一透鏡810之間，且不影響該三片式薄型成像鏡片組的焦距。The
該第一透鏡810具有負屈折力，且為塑膠材質，其物側表面811近光軸890處為凹面，其像側表面812近光軸890處為凹面，且該物側表面811及像側表面812皆為非球面。The
該第二透鏡820具有正屈折力，且為塑膠材質，其物側表面821近光軸890處為凸面，其像側表面822近光軸890處為凸面，且該物側表面821及像側表面822皆為非球面。The
該第三透鏡830具有正屈折力，且為塑膠材質，其物側表面831近光軸890處為凸面，其像側表面832近光軸890處為凸面，且該物側表面831及像側表面832皆為非球面。The
該紅外線濾除濾光片870為玻璃材質，其設置於該第三透鏡830及成像面880間且不影響該三片式薄型成像鏡片組的焦距。The
再配合參照下列表15、以及表16。Refer to Table 15 and Table 16 below.
第八實施例中，非球面的曲線方程式表示如第一實施例的形式。此外，下表參數的定義皆與第一實施例相同，在此不加以贅述。In the eighth embodiment, the curve equation of the aspherical surface is expressed as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and will not be repeated here.
配合表15、以及表16可推算出下列數據：Together with Table 15 and Table 16, the following data can be deduced:
本發明提供的三片式薄型成像鏡片組，透鏡的材質可為塑膠或玻璃，當透鏡材質為塑膠，可以有效降低生產成本，另當透鏡的材質為玻璃，則可以增加三片式薄型成像鏡片組屈折力配置的自由度。此外，三片式薄型成像鏡片組中透鏡的物側表面及像側表面可為非球面，非球面可以容易製作成球面以外的形狀，獲得較多的控制變數，用以消減像差，進而縮減透鏡使用的數目，因此可以有效降低本發明三片式薄型成像鏡片組的總長度。In the three-piece thin imaging lens set provided by the present invention, the lens material can be plastic or glass. When the lens material is plastic, the production cost can be effectively reduced, and when the lens material is glass, the three-piece thin imaging lens can be added The degree of freedom of the configuration of the group's bending force In addition, the object-side surface and the image-side surface of the lens in the three-piece thin imaging lens group can be aspherical, and the aspherical surface can be easily made into a shape other than a spherical surface, and more control variables are obtained to reduce aberrations and further reduce The number of lenses used can effectively reduce the total length of the three-piece thin imaging lens group of the present invention.
本發明提供的三片式薄型成像鏡片組中，就以具有屈折力的透鏡而言，若透鏡表面係為凸面且未界定該凸面位置時，則表示該透鏡表面於近光軸處為凸面；若透鏡表面係為凹面且未界定該凹面位置時，則表示該透鏡表面於近光軸處為凹面。In the three-piece thin imaging lens group provided by the present invention, as for the lens with refractive power, if the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at the near optical axis; If the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at the low optical axis.
綜上所述，上述各實施例及圖式僅為本發明的較佳實施例而已，當不能以之限定本發明實施之範圍，即大凡依本發明申請專利範圍所作的均等變化與修飾，皆應屬本發明專利涵蓋的範圍內。In summary, the above-mentioned embodiments and drawings are only preferred embodiments of the present invention. When it cannot be used to limit the scope of implementation of the present invention, that is, all equal changes and modifications made in accordance with the scope of the patent application of the present invention are all It should fall within the scope covered by the invention patent.
100、200、300、400、500、600、700、800:光圈110、210、310、410、510、610、710、810:第一透鏡111、211、311、411、511、611、711、811:物側表面112、212、312、412、512、612、712、812:像側表面120、220、320、420、520、620、720、820:第二透鏡121、221、321、421、521、621、721、821:物側表面122、222、322、422、522、622、722、822:像側表面130、230、330、430、530、630、730、830:第三透鏡131、231、331、431、531、631、731、831:物側表面132、232、332、432、532、632、732、832:像側表面160、260、360、460、560、660、760、860:平板元件170、270、370、470、570、670、770、870:紅外線濾除濾光片180、280、380、480、580、680、780、880:成像面190、290、390、490、590、690、790、890:光軸f:三片式薄型成像鏡片組的焦距Fno:三片式薄型成像鏡片組的光圈值FOV:三片式薄型成像鏡片組中最大視場角f1:第一透鏡的焦距f2:第二透鏡的焦距f3:第三透鏡的焦距R1:第一透鏡物側表面的曲率半徑R2:第一透鏡像側表面的曲率半徑R3:第二透鏡物側表面的曲率半徑R4:第二透鏡像側表面的曲率半徑R5:第三透鏡物側表面的曲率半徑R6:第三透鏡像側表面的曲率半徑OTL:被攝物至成像面於光軸上的距離100, 200, 300, 400, 500, 600, 700, 800: aperture 110, 210, 310, 410, 510, 610, 710, 810: first lens 111, 211, 311, 411, 511, 611, 711, 811: Object-side surface 112, 212, 312, 412, 512, 612, 712, 812: Image-side surface 120, 220, 320, 420, 520, 620, 720, 820: Second lens 121, 221, 321, 421 , 521, 621, 721, 821: object side surfaces 122, 222, 322, 422, 522, 622, 722, 822: image side surfaces 130, 230, 330, 430, 530, 630, 730, 830: third lens 131, 231, 331, 431, 531, 631, 731, 831: object side surface 132, 232, 332, 432, 532, 632, 732, 832: image side surface 160, 260, 360, 460, 560, 660, 760, 860: Flat element 170, 270, 370, 470, 570, 670, 770, 870: Infrared filter 180, 280, 380, 480, 580, 680, 780, 880: Imaging surface 190, 290, 390, 490, 590, 690, 790, 890: optical axis f: focal length of the three-piece thin imaging lens group Fno: aperture value of the three-piece thin imaging lens group FOV: maximum field of view among the three-piece thin imaging lens group Angle f1: focal length of the first lens f2: focal length of the second lens f3: focal length of the third lens R1: radius of curvature of the object-side surface of the first lens R2: radius of curvature of the image-side surface of the first lens R3: second lens object Radius of curvature R4 of the side surface: Radius of curvature of the image side surface of the second lens R5: Radius of curvature of the object side surface of the third lens R6: Radius of curvature of the image side surface of the third lens OTL: Subject to imaging surface on the optical axis the distance
圖1A係本發明第一實施例之三片式薄型成像鏡片組的示意圖。 圖1B係圖1A的局部放大圖。 圖1C由左至右依序為第一實施例的三片式薄型成像鏡片組的像面彎曲及歪曲收差曲線圖。 圖2A係本發明第二實施例之三片式薄型成像鏡片組的示意圖。 圖2B係圖2A的局部放大圖。 圖2C由左至右依序為第二實施例的三片式薄型成像鏡片組的像面彎曲及歪曲收差曲線圖。 圖3A係本發明第三實施例之三片式薄型成像鏡片組的示意圖。 圖3B係圖3A的局部放大圖。 圖3C由左至右依序為第三實施例的三片式薄型成像鏡片組的像面彎曲及歪曲收差曲線圖。 圖4A係本發明第四實施例之三片式薄型成像鏡片組的示意圖。 圖4B係圖4A的局部放大圖。 圖4C由左至右依序為第四實施例的三片式薄型成像鏡片組的像面彎曲及歪曲收差曲線圖。 圖5A係本發明第五實施例之三片式薄型成像鏡片組的示意圖。 圖5B係圖5A的局部放大圖。 圖5C由左至右依序為第五實施例的三片式薄型成像鏡片組的像面彎曲及歪曲收差曲線圖。 圖6A係本發明第六實施例之三片式薄型成像鏡片組的示意圖。 圖6B係圖6A的局部放大圖。 圖6C由左至右依序為第六實施例的三片式薄型成像鏡片組的像面彎曲及歪曲收差曲線圖。 圖7A係本發明第七實施例之三片式薄型成像鏡片組的示意圖。 圖7B係圖7A的局部放大圖。 圖7C由左至右依序為第七實施例的三片式薄型成像鏡片組的像面彎曲及歪曲收差曲線圖。 圖8A係本發明第八實施例之三片式薄型成像鏡片組的示意圖。 圖8B係圖8A的局部放大圖。 圖8C由左至右依序為第八實施例的三片式薄型成像鏡片組的像面彎曲及歪曲收差曲線圖。FIG. 1A is a schematic diagram of a three-piece thin imaging lens group according to the first embodiment of the present invention. FIG. 1B is a partial enlarged view of FIG. 1A. FIG. 1C is a graph of the curvature of curvature and distortion of the image plane of the three-piece thin imaging lens group of the first embodiment from left to right. 2A is a schematic diagram of a three-piece thin imaging lens group according to a second embodiment of the present invention. FIG. 2B is a partial enlarged view of FIG. 2A. FIG. 2C is a graph of the curvature of curvature and distortion of the image plane of the three-piece thin imaging lens group of the second embodiment in order from left to right. 3A is a schematic diagram of a three-piece thin imaging lens group according to a third embodiment of the present invention. FIG. 3B is a partial enlarged view of FIG. 3A. FIG. 3C is a graph of the curvature of curvature and distortion of the image plane of the three-piece thin imaging lens group of the third embodiment from left to right. 4A is a schematic diagram of a three-piece thin imaging lens group according to a fourth embodiment of the present invention. 4B is a partially enlarged view of FIG. 4A. FIG. 4C is a graph of the curvature of curvature and distortion of the image plane of the three-piece thin imaging lens group of the fourth embodiment in order from left to right. 5A is a schematic diagram of a three-piece thin imaging lens group according to a fifth embodiment of the present invention. FIG. 5B is a partial enlarged view of FIG. 5A. FIG. 5C is a graph of the curvature of curvature and distortion of the image plane of the three-piece thin imaging lens group of the fifth embodiment from left to right. 6A is a schematic diagram of a three-piece thin imaging lens group according to a sixth embodiment of the present invention. 6B is a partially enlarged view of FIG. 6A. FIG. 6C is a graph of the curvature of curvature and distortion of the image plane of the three-piece thin imaging lens group of the sixth embodiment from left to right. 7A is a schematic diagram of a three-piece thin imaging lens group according to a seventh embodiment of the present invention. 7B is a partially enlarged view of FIG. 7A. FIG. 7C is a graph of the curvature of curvature and distortion of the image plane of the three-piece thin imaging lens group of the seventh embodiment from left to right. 8A is a schematic diagram of a three-piece thin imaging lens group according to an eighth embodiment of the present invention. 8B is a partially enlarged view of FIG. 8A. FIG. 8C is a graph of the curvature of curvature and distortion of the image plane of the three-piece thin imaging lens group of the eighth embodiment from left to right.
100:光圈 100: aperture
110:第一透鏡 110: the first lens
111:物側表面 111: Object side surface
112:像側表面 112: like side surface
120:第二透鏡 120: second lens
121:物側表面 121: Object-side surface
122:像側表面 122: like side surface
130:第三透鏡 130: third lens
131:物側表面 131: Object side surface
132:像側表面 132: Image side surface
160:平板元件 160: flat element
170:紅外線濾除濾光片 170: Infrared filter
180:成像面 180: imaging surface
190:光軸 190: Optical axis
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