TW201022713A

TW201022713A - Optical lens system for taking image

Info

Publication number: TW201022713A
Application number: TW97146607A
Authority: TW
Inventors: Hsiang-Chi Tang; Ming-Ching Lin
Original assignee: Largan Precision Co Ltd
Priority date: 2008-12-01
Filing date: 2008-12-01
Publication date: 2010-06-16
Also published as: TWI378260B

Abstract

An optical lens system for taking image comprises, in order from the object side to the image side: a first lens element with positive refractive power having a convex object-side surface; an aperture stop; a second lens element with negative refractive power; a third lens element having a convex object-side surface; and a fourth lens element with negative refractive power having a concave object-side surface, and the image-side surface of the fourth lens element is aspheric surface with inflection points. The on-axis distance between the image-side surface of the fourth lens element and the image plane of the system is BFL, the total track length of the system is TTL, and they satisfy the relation: BFL/TTL > 0.12. In the optical lens system, there are only four lens elements with refractive power. By such arrangements, the volume of the optical lens system and the sensitivity of the optical system can be effectively reduced, and further, a relatively high resolution can be obtained.

Description

201022713 六、發明說明：【發明所屬之技術領域】本發明係一種光學系統，特別是指一種應用於照相手機的取像光學系統。【先前技術】最近幾年來，隨著手機相機的興起，小型化攝影鏡頭的需求曰漸提高，而一般攝影鏡頭的感光元件不外乎是感 © 光搞合元件（Charge Coupled Device，CCD)或互補性氧化金屬半導體（Complementary Meta卜Oxide Semiconductor， CMOS)兩種’且由於半導體製程技術的進步，使得感光元件的晝素面積縮小，小型化攝影鏡頭逐漸往高晝素領域發展’因此’對成像品質的要求也日益增加。習見的高解像力手機鏡頭，多採用前置光圈且為四枚 ®式的透鏡組，其中，第一透鏡及第二透鏡常以二牧玻璃球面鏡互相黏合而成為Doublet，用以消除色差，如[JS 7, 365, 920所示’但此方法有其缺點，其一，過多的球面鏡配置使得系統自由度不足’造成光學系統全長不易縮短’其二，玻璃鏡片黏合的製程不易，造成製造上的困難。 US 7, 277, 238為四枚獨立透鏡的透鏡組，包含有複數個非球面透鏡’可以有效縮短光學系統的光學總長度，並獲得 201022713 良好的成像品負’但由於其光圈設置於第一透鏡之前，將使得系統的敏感度也相對提高，對製造上良率的控制較為困難。【發明内容】為提升光學系統的成像品質，並有效縮短透鏡組體積，本發明提供一種由四片透鏡構成之取像光學系統，其要旨如下： .一種取像光學系統’由物侧至像侧依序包含：一具正屈折力的第一透鏡’其前表面為凸面；一光圈；一具負屈折力的第二透鏡；一第三透鏡；一具負屈折力的第四透鏡，其前表面為凹面，第四透鏡後表面設置有非球面，第四透鏡後表面設置有反曲點；取像光學系統中，具屈折力的透鏡僅為四片；藉由上述的鏡片配置‘方式，可以有效降低系統的敏感度與提升成像品質。本發明取像光學系統中’系統的屈折力主要由具正屈折力的第一透鏡提供，具負屈折力的第二透鏡的功用主要為修正色差，第三透鏡的功能為分配系統所需的屈折力，可使系統的敏感度降低，而第四透鏡具負屈折力，且其前表面為凹面，使得系統的主點遠離成像面，可以更有效縮短取像光學系統的光學總長度。 201022713 本發明取像光學系統中，當第三透鏡為雙凸透鏡’則取像光學系統各透鏡的屈折力可以有效降低；當第三透鏡為具正屈折力的新月型透鏡，則可以有效降低取像光學系統的像散（Astigmatism)。藉由第一透鏡提供強大的正屈折力’並將光圈置於接近取像光學系統的物體侧，可有效縮短取像光學系統的光 ^ 學總長度；另外，上述的配置可使取像光學系統的出射瞳 (Exit Pupil)遠離成像面，因此，光線將以接近垂直入射的方式入射在感光元件上，此即為成像侧的遠心 (Telecentric)特性，遠心特性對於時下固態電子感光元件的感光能力是極為重要的，將使得電子感光元件的感光敏感度提高，減少系統產生暗角的可能性；此外，在第四透鏡上設置有反曲點，將更有效地壓制離軸視場的光線入 φ 射在感光元件上的角度。此外’在廣角光學系統中，特別需要對歪曲 (Distortion)以及倍率色收差（Chromatic Aberrati〇n 〇f201022713 VI. Description of the Invention: [Technical Field] The present invention relates to an optical system, and more particularly to an image taking optical system applied to a camera. [Prior Art] In recent years, with the rise of mobile phone cameras, the demand for miniaturized photographic lenses has been increasing, and the photosensitive elements of general photographic lenses are nothing more than a Charge Coupled Device (CCD) or Complementary Meta-Oxide Semiconductor (CMOS), and due to advances in semiconductor process technology, the pixel area of the photosensitive element is reduced, and the miniaturized photographic lens is gradually developing into the high-quality field. Quality requirements are also increasing. The high-resolution mobile phone lens that I have seen uses a front aperture and a four-piece lens group. The first lens and the second lens are often bonded to each other by a two-grain glass sphere mirror to form a Doublet to eliminate chromatic aberration, such as [ JS 7, 365, 920 shows 'But this method has its shortcomings. First, too many spherical mirror configurations make the system less than 'the length of the optical system is not easy to shorten'. Second, the glass lens bonding process is not easy, resulting in manufacturing difficult. US 7, 277, 238 is a lens set of four independent lenses, including a plurality of aspherical lenses' can effectively shorten the optical total length of the optical system, and obtain a good image of the 201022713 negative 'but because its aperture is set at the first Before the lens, the sensitivity of the system will be relatively increased, and the control of the manufacturing yield is difficult. SUMMARY OF THE INVENTION In order to improve the imaging quality of an optical system and effectively shorten the lens group volume, the present invention provides an image taking optical system composed of four lenses, the gist of which is as follows: An image taking optical system from the object side to the image The side sequence includes: a first lens having a positive refractive power, a front surface of which is a convex surface; an aperture; a second lens having a negative refractive power; a third lens; and a fourth lens having a negative refractive power; The front surface is a concave surface, the rear surface of the fourth lens is provided with an aspherical surface, the rear surface of the fourth lens is provided with an inflection point; in the image taking optical system, the lens having a refractive power is only four pieces; Can effectively reduce the sensitivity of the system and improve the image quality. In the image taking optical system of the present invention, the refractive power of the system is mainly provided by the first lens having positive refractive power, and the function of the second lens having negative refractive power is mainly for correcting chromatic aberration, and the function of the third lens is required for the distribution system. The refractive power can reduce the sensitivity of the system, while the fourth lens has a negative refractive power, and the front surface is concave, so that the main point of the system is away from the imaging surface, which can effectively shorten the optical total length of the image taking optical system. 201022713 In the image taking optical system of the present invention, when the third lens is a lenticular lens, the refractive power of each lens of the image taking optical system can be effectively reduced; when the third lens is a crescent lens with positive refractive power, the effective can be effectively reduced. Take the astigmatism of the optical system. By providing a strong positive refractive power by the first lens and placing the aperture on the object side close to the image taking optical system, the total optical length of the image taking optical system can be effectively shortened; in addition, the above configuration can take imaging optics The Exit Pupil of the system is far away from the imaging surface. Therefore, the light will be incident on the photosensitive element in a near-normal incidence. This is the telecentric characteristic of the imaging side, and the telecentric characteristics are for the current solid-state electronic photosensitive element. Photosensitive ability is extremely important, which will increase the sensitivity of the electronic photosensitive element and reduce the possibility of vignetting in the system. In addition, the inversion point on the fourth lens will more effectively suppress the off-axis field of view. The angle at which light enters φ on the photosensitive element. In addition, in the wide-angle optical system, distortion and distortion color collection are particularly required (Chromatic Aberrati〇n 〇f

Magnification)做修正，其方法為將光圈置於系統光屈折力的平衡處；本發明若將光圈置於第一透鏡之前，則著重於遠心的特性’取像光學系統的光學總長度可以更短；若將光圈置於第一透鏡與第二透鏡之間，則較著重於廣視場 201022713 角的特性；同時，如此的光圈位置的配置，可以有致降低系統的敏感度。隨著照相手機鏡頭小型化的趨勢’以及系統需涵蓋^ 泛的視角，使得光學系統的焦距變得很短，在這種情、、兄下，鏡片的曲率半徑以及鏡片尺寸皆變得很小，以傳统坡璃研磨的方法將難以製造出上述的鏡片，因此，在鏡片上採用塑膠材質，藉由射出成型的方式製作鏡片，可低廉的成本生產高精密度的鏡片；並於鏡面上設置有非_ 面，非球面可以容易製作成球面以外的形狀，獲得較多的Magnification) is to make the correction by placing the aperture in the balance of the system light refractive power; if the aperture is placed in front of the first lens, the focus is on the telecentric characteristic. The total optical length of the imaging optical system can be shorter. If the aperture is placed between the first lens and the second lens, the emphasis is on the characteristics of the wide field of view 201022713; at the same time, the configuration of such an aperture position can reduce the sensitivity of the system. With the trend of miniaturization of camera phone lenses, and the need to cover a wide range of viewing angles, the focal length of the optical system becomes very short. Under this situation, the curvature radius of the lens and the lens size become very small. The conventional glass grinding method will make it difficult to manufacture the above-mentioned lens. Therefore, the plastic material is used on the lens, and the lens is produced by injection molding, and the high-precision lens can be produced at a low cost; If there is a non-face, the aspheric surface can be easily made into a shape other than the spherical surface, and more is obtained.

控制變數，用以消減像差，進而縮減鏡片使用的數目，M 错此可以有效縮短取像光學系統的光學總長度。本發明取像光學系統中’整體取像光學系統的焦矩為 f，第一透鏡的焦距為fl，其關係為： 0.8<f/fl<1.45 ；當f/fl滿足上述關係式時，第一透鏡的屈折力大小配置較為平衡，可有效控制系統的光學總長度’維持小型化的目標，並同時較有利於修正系統的局階像差’提升成像品質。本發明取像光學系統中，整體取像光學系統的焦矩為 201022713 f，第三透鏡的焦距為f3，其關係為： 0<f/f3<0,85 ；當i/f3滿足上述關係式，可較有利於分配系統的屈折力，且同時不致於產生過多額外的高階像差。本發明取像光學系統中，第一透鏡折射率N1，第二透鏡折射率N2，其關係為： | N1-N2 | <0.12 ；當N1-N2滿足上記關係，可較有效提升取像光學系統修正像散（Asti gmat ism)的能力。本發明取像光學系統中，整體取像光學系統的焦距為 f，第四透鏡後表面於有效徑位置的鏡面高度為SAG42，其關係為： SAG42/f<-0. 02 鏡面高度的方向定義為：『當周邊有效徑位置的鏡面高度朝向像侧則定義為正；有效徑位置的鏡面高度朝向物側則定義為負』。當SAG42/f滿足上記關係，可有效縮小光線入射感光元件的角度並且較有利於增強系統修正軸外像差的能力。本發明取像光學系統中，第一透鏡的色散係數（Abbe 8 201022713The control variable is used to reduce the aberration, thereby reducing the number of lenses used, and M can effectively shorten the total optical length of the image taking optical system. In the image taking optical system of the present invention, the focal moment of the 'integrated image taking optical system is f, and the focal length of the first lens is fl, and the relationship is: 0.8 < f / fl <1.45; when f / fl satisfies the above relationship, The first lens has a relatively balanced configuration of the refractive power, which can effectively control the total optical length of the system to maintain the goal of miniaturization, and at the same time is more conducive to correcting the system's partial aberrations to improve imaging quality. In the image taking optical system of the present invention, the focal moment of the overall image taking optical system is 201022713 f, and the focal length of the third lens is f3, and the relationship is: 0 < f / f3 < 0, 85 ; when i / f3 satisfies the above relationship It can be advantageous for the flexural force of the distribution system, and at the same time does not produce too much extra high-order aberrations. In the image taking optical system of the present invention, the first lens refractive index N1 and the second lens refractive index N2 are as follows: | N1-N2 | <0.12; When N1-N2 satisfies the above relationship, the imaging optical can be effectively improved. The ability to systematically correct astigmatism (Asti gmat ism). In the image taking optical system of the present invention, the focal length of the integral image taking optical system is f, and the mirror height of the rear surface of the fourth lens at the effective diameter position is SAG42, and the relationship is: SAG42/f<-0. 02 Direction definition of the mirror height It is: "When the mirror height of the effective effective path position is toward the image side, it is defined as positive; the mirror height of the effective diameter position is defined as negative toward the object side. When the SAG42/f satisfies the above relationship, it can effectively reduce the angle at which light is incident on the photosensitive element and is more advantageous for enhancing the ability of the system to correct the off-axis aberration. The dispersion coefficient of the first lens in the image taking optical system of the present invention (Abbe 8 201022713

Number)為vi，第三透鏡的色散係數為V3，第四透鏡的色散係數為V4，其關係為： I V1-V3 | <15 ； I V3-V4 | >15 ；滿足上記關係式，可較有利於修正取像光學系統的像散’提高取像光學系統的成像品質。本發明取像光學系統中，光圈至成像面的距離為SL ’ 取像光學系統的光學總長度為TTL，TTL定義為取像光學鏡片組中第一透鏡前表面至成像面於光軸上的距離，其關係為： SL/TTL<0. 92 ；當SL/TTL毅上記關係，可财利鄉正取像光學統的歪曲（Distortion)以及倍率多你叹差（Chromati ❹Number) is vi, the third lens has a dispersion coefficient of V3, and the fourth lens has a dispersion coefficient of V4, and the relationship is: I V1-V3 | <15; I V3-V4 | >15; satisfies the above relationship, It is more advantageous to correct the astigmatism of the imaging optical system to improve the imaging quality of the imaging optical system. In the image taking optical system of the present invention, the distance from the aperture to the imaging surface is SL'. The total optical length of the image taking optical system is TTL, and the TTL is defined as the front surface of the first lens in the image pickup optical lens group to the optical axis on the imaging surface. Distance, the relationship is: SL / TTL < 0. 92 ; When SL / TTL is on the relationship, you can take the distortion of the optical system (Distortion) and the rate of your sigh (Chromati ❹

Aberration of Magnification)，且軔士从 „ 較有政降低系統的i 感度，提升取像光學系統在製造上的良率。月1J表面曲率半徑其關係為：本發明取像光學系統中，第二透鏡的為R3，第二透鏡的後表面曲率半徑為μ， -2.0<(R3+R4)/(R3-R4)<5. 0 ; 可較有利於修正系統的當R3與R4滿足上記關係 Petzval Sum ° 9 201022713 本發明取像光學系統中，第四透鏡的前表面曲率半徑為R7，第四透鏡的後表面曲率半徑為R8，其關係為： R7/R8<-5.0 ；當R7與R8滿足上記關係，可較有利於修正取像光學系統的高階像差。本發明取像光學系統中，第四透鏡後表面至成像面於光軸上的距離為BFL，取像光學系統的光學總長度為TTL ’ 其關係為： BFL/TTL>0. 12 ；當BFL與TTL滿足上記關係，可較有利於系統維持足夠的後焦長度，使得鏡頭在組裝或調焦上能有足夠的空間。進一步來說，使BFL/TTL滿足下記關係則較為理想： BFL/TTLX). 15。本發明取像光學系統中，該取像光學系統之被攝物成像於電子感光元件上，取像光學系統的光學總長度為 TTL，取像光學系統的成像高度為ImgH，ImgH定義為電子感光元件有效畫素區域對角線長的一半，其關係為： TTL/ImgH<2.10 ；當TTL/ImgH滿足上記關係則對維持取像光學系統小塑化的特性較為理想；進一步來說，使TTL/ImgH滿足下記 201022713 關係則更為理想： TTL/ImgH<l·95 。【實施方式】本發明第一實施例請參閱第1A圖，第一實施例之像差曲線請參閱第1B圖，第一實施例由物側至像侧依序包含：一具正屈折力的第一透鏡10，其材質為塑膠，第一透鏡10的前表面11為凸面，後表面12為凹面，另第一透鏡10 ® 的前表面11與後表面12皆設置有非球面；一具負屈折力的第二透鏡20，其材質為塑膠，第二透鏡20的前表面21為凹面，後表面22為凸面，另第二透鏡的前表面21與後表面2 2皆設置有非球面；一具正屈折力的第三透鏡30，其材質為塑膠，第三透鏡30的前表面31為凸面，後表面32為凸面，另第三透鏡30 的前表面31與後表面32皆設置有非球面；一具負屈折力的第四透鏡40，其材質為塑膠，第四透鏡40的前表面41為凹面，後表面42為凹面，另第四透鏡40 的前表面41與後表面42皆設置有非球面，且第四透鏡40 的後表面42設置有反曲點；一光圈50，置於第一透鏡10與該第二透鏡20之間；一紅外線濾、除濾、光片（IR FiIter)60，置於第四透鏡 40之後，其不影響系統的焦距； 11 201022713 一成像面70，置於紅外線濾除濾光片60之後。上述非球面曲線的方程式表示如下： X(YMY2/R)/(l+sqrt(l-(i+k)*(Y/R)2))+[(A.)*(r·) / 其中： X :非球面上距離光軸為γ的點，其與相切於非球面光軸上頂點的切面的相對高度；參 Y:非球面曲線上的點與光軸的距離； k:錐面係數；Aberration of Magnification), and the gentleman's i sensitivity from the more politically reduced system improves the manufacturing yield of the optical system. The 1J surface curvature radius is related to: The lens is R3, and the radius of curvature of the back surface of the second lens is μ, -2.0<(R3+R4)/(R3-R4)<5. 0; can be more favorable for the correction system when R3 and R4 satisfy the above Relationship Petzval Sum ° 9 201022713 In the image taking optical system of the present invention, the radius of curvature of the front surface of the fourth lens is R7, and the radius of curvature of the back surface of the fourth lens is R8, the relationship is: R7/R8<-5.0; when R7 and R8 satisfies the above relationship, and is more advantageous for correcting the high-order aberration of the image taking optical system. In the image taking optical system, the distance from the rear surface of the fourth lens to the optical axis of the imaging surface is BFL, and the optical of the image taking optical system The total length is TTL 'The relationship is: BFL / TTL> 0. 12 ; When the BFL and TTL meet the above relationship, it is more conducive to the system to maintain sufficient back focus length, so that the lens can have enough space for assembly or focusing Further, make BFL/TTL meet The relationship is more ideal: BFL/TTLX). 15. In the image taking optical system of the present invention, the object of the image taking optical system is imaged on the electronic photosensitive element, and the total optical length of the image taking optical system is TTL. The imaging height of the optical system is ImgH, and ImgH is defined as half of the diagonal length of the effective pixel area of the electronic photosensitive element, and the relationship is: TTL/ImgH<2.10; when the TTL/ImgH satisfies the above relationship, the image processing optical system is small. Further, it is more desirable to make the TTL/ImgH satisfy the relationship of 201022713: TTL/ImgH<l·95. [Embodiment] Please refer to FIG. 1A for the first embodiment of the present invention. For the aberration curve of the embodiment, please refer to FIG. 1B. The first embodiment includes, in order from the object side to the image side, a first lens 10 having a positive refractive power, which is made of plastic, and the front surface 11 of the first lens 10 The convex surface, the rear surface 12 is a concave surface, and the front surface 11 and the rear surface 12 of the first lens 10 ® are both provided with an aspherical surface; a second lens 20 having a negative refractive power is made of plastic, and the second lens 20 is The front surface 21 is concave, The surface 22 is a convex surface, and the front surface 21 and the rear surface 22 of the second lens are both provided with an aspherical surface; a third lens 30 having a positive refractive power is made of plastic, and the front surface 31 of the third lens 30 is convex. The rear surface 32 is a convex surface, and the front surface 31 and the rear surface 32 of the third lens 30 are both provided with an aspherical surface; a fourth lens 40 having a negative refractive power is made of plastic, and the front surface 41 of the fourth lens 40 is 41. The concave surface, the rear surface 42 is a concave surface, and the front surface 41 and the rear surface 42 of the fourth lens 40 are both provided with an aspherical surface, and the rear surface 42 of the fourth lens 40 is provided with an inflection point; Between a lens 10 and the second lens 20; an infrared filter, a filter, an optical film (IR Fierter) 60, placed after the fourth lens 40, which does not affect the focal length of the system; 11 201022713 an imaging surface 70, placed After the infrared filter filter 60 is removed. The equation of the above aspheric curve is expressed as follows: X(YMY2/R)/(l+sqrt(l-(i+k)*(Y/R)2))+[(A.)*(r·) / where : X : the relative height of the aspherical surface from the optical axis γ, which is tangent to the tangential surface of the apex on the aspherical optical axis; YY: the distance between the point on the aspherical curve and the optical axis; k: the tapered surface coefficient;

Ai :第i階非球面係數。第一實施例中，整體取像光學系統的焦距為f，★ 透鏡的焦距為fl，第三透鏡的焦距為f3，其關係為第〜 f = 3. 21 mm ； ® f/fl = 1.15 ； f/f3 = 0.63 。第一實施例中，第一透鏡折射率為Ni，麓_Ai : the i-th order aspheric coefficient. In the first embodiment, the focal length of the overall imaging optical system is f, the focal length of the lens is fl, the focal length of the third lens is f3, and the relationship is - f = 3.21 mm; ® f/fl = 1.15; f/f3 = 0.63. In the first embodiment, the refractive index of the first lens is Ni, 麓_

A矛一遷錶此A 率為N2,其關係為：兄诉射 | N1-N2 | = 0.〇88 〇 12 201022713 第一實施例中’第一透鏡色散係數（Abbe Number)為 VI ’第三透鏡色散係數為V3，第四透鏡色散係數為V4，其關係為. | V1-V3 | = 0. 0 ； | V3-V4 丨=32· 5。第一實施例中，第二透鏡的前表面曲率半徑為R3，第 Φ 二透鏡的後表面曲率半徑為R4，第四透鏡的前表面曲率半徑為R7，第四透鏡的後表面曲率半徑為R8，其關係為： (R3+R4)/(R3-R4) = -7.14 ； R7/R8 = -33.39 。第一實施例中，光圈至成像面的距離為SL，取像光學系統的光學總長度為TTL，其關係為： SL/TTL = 0. 87。第一實施例中，第四透鏡後表面至成像面於光軸上的距離為BFL，取像光學系統的光學總長度為TTL，其關係為： BFL/m = 0· 23。第一實施例中，第四透鏡後表面於有效徑位置的鏡面高度為SAG42，整體取像光學系統的焦姖為f，其關係為： 13 201022713 SAG42/f = -0.06 。第一實施例中，該取像光學系統之被攝物成像於電子感光元件上，取像光學系統的光學總長度為TTL，取像光學糸統的成像面度為I ingH *其關係為： TTL/ImgH=l. 75。 ^ 第一實施例詳細的結構數據如同表1所示，其非球面 Ο 數據如同表2所示，其中，曲率半徑、厚度及焦距的單位為mm，HFOV定義為最大視角的一半。本發明第二實施例請參閱第2A圖，第二實施例之像差曲線請參閱第2B圖，第二實施例由物側至像侧依序包含：一具正屈折力的第一透鏡10，其材質為塑膠，第一透 @ 鏡10的前表面11為凸面，後表面12為凹面，另第一透鏡10 的前表面11與後表面12皆設置有非球面；一具負屈折力的第二透鏡20，其材質為塑膠，第二透鏡20的前表面21為凹面，後表面22為凸面，另第二透鏡20 的前表面21與後表面22皆設置有非球面；一具正屈折力的第三透鏡30，其材質為塑膠，第三透鏡30的前表面31為凸面，後表面32為凸面，另第三透鏡30 的前表面31與後表面32皆設置有非球面； 14 201022713 一具負屈折力的第四透鏡40，其材質為塑膠，第四透鏡40的前表面41為凹面，後表面42為凹面，另第四透鏡40 的前表面41與後表面42皆設置有非球面，且第四透鏡40 的後表面42設置有反曲點；一光圈50，置於第一透鏡10與第二透鏡20之間；一紅外線渡除濾光片（IR Filter)60，置於第四透鏡 40之後，其不影響系統的焦距；一成像面70，置於紅外線濾除濾光片60之後。第二實施例非球面曲線方程式的表示式如同第一實施例的型式。第二實施例中，整體取像光學系統的焦距為f，第一透鏡的焦距為fl，第三透鏡的焦距為f3，其關係為： ❹ f = 3. 30 mm ; f/fl = 1. 19 ; f/f3 = 1. 04。第二實施例中，第一透鏡折射率為N1，第二透鏡折射率為N2，其關係為：丨 N1-N2 丨=0.088 。 15 201022713 第二實施例中’第一透鏡色散係數（Abbe Number)為 VI，第三透鏡色散係數為V3，第四透鏡色散係數為V4，其關係為： | V1-V3 | = 0. 0 ； | V3-V4 卜0.0。第二實施例中’第二透鏡的前表面曲率半徑為R3，第二透鏡的後表面曲率半徑為R4,第四透鏡的前表面曲率半徑為R7，第四透鏡的後表面曲率半徑為1^8，其關係為： (R3+R4)/(R3-R4) = -4.00 ； R7/R8 = -2.93 。第二實施例中，光圈至成像面的距離為SL，取像光學系統的光學總長度為TTL，其關係為： SL/TTL = 〇· 88。第二實施例中，第四透鏡後表面至成像面於光軸上的距離為BFL，取像光學系統的光學總長度為TTL，其關係為： BFL/TTL = 0. 26 ；第二實施例中’第四透鏡後表面於有效徑位置的鏡面高度為SAG42，整體取像光學系統的焦距為f ’其關係為： 201022713 SAG42/f = -0.〇3 。第二實施例中，該取像光學系統之被攝物成像於電子感光元件上，取像光學系統的光學總長度為TTL，取像光學系統的成像南度為I mgH，其關係為· TTL/ImgH=1.85 。第二實施例詳細的結構數據如同表3所示，其非球面數據如同表4所示，其中，曲率半徑、厚度及焦距的單位為匪，HFOV定義為最大視角的一半。本發明第三實施例請參閱第3A圖，第三實施例之像差曲線請參閱第3B圖，第三實施例由物側至像侧依序包含：一具正屈折力的第一透鏡10 ’其材質為塑膠，第一透鏡10的前表面11為凸面，後表面12為凸面，另第一透鏡1〇的前表面11與後表面12皆設置有非球面；一具負屈折力的第二透鏡20，其材質為塑膠，第二透鏡20的前表面21為凹面，後表面22為凹面，另第二透鏡的前表面21與後表面22皆設置有非球面；一具正屈折力的第三透鏡30，其材質為塑膠，第三透鏡30的前表面31為凹面’後表面32為凸面，另第三透鏡3〇的前表面31與後表面32皆設置有非球面； 17 201022713 一具負屈折力的第四透鏡40,其材質為塑膠，第四透鏡40的前表面41為凹面，後表面42為凹面，另第四透鏡40 的前表面41與後表面42皆設置有非球面，且第四透鏡40 的後表面42設置有反曲點；一光圈50,置於第一透鏡10與第二透鏡20之間；一紅外線遽除濾、光片（IR F i 1 ter) 60，置於第四透鏡 40之後，其不影響系統的焦距；一成像面70，置於紅外線濾除濾光片60之後。第三實施例非球面曲線方程式的表示式如同第一實施例的型式。第三實施例中，整體取像光學系統的焦距為f，第一透鏡的焦距為fl，第三透鏡的焦距為f3，其關係為： f = 3. 35 mm ； f/fl = 1. 75 ; f/f3 = 1. 2卜第三實施例中，第一透鏡折射率為N1，第二透鏡折射率為N2，其關係為： | N1-N2 | = 0.088 。 18 201022713 第三實施例中’第一透鏡色散係數（Abbe Number)為 VI，第三透鏡色散係數為V3 ’第四透鏡色散係數為乂4，其關係為： | V1-V3 | = 0. 1 ； | V3-V4 | 二 0. 0。第三實施例中’第二透鏡的前表面曲率半徑為R3，第二透鏡的後表面曲率半徑為R4,第四透鏡的前表面曲率半徑為R7，第四透鏡的後表面曲率半#為R8，其關係為： (R3+R4)/(R3-R4) = 0. 96 ； R7/R8 = -63.9卜第三實施例中，光圈至成像面的距離為SL，取像光學系統的光學總長度為m，其關係為： SL/TTL = 0. 87。第三實施例中，第四透鏡後表面至成像面於光軸上的距離為BFL，取像光學系統的光學總長度為TTL，其關係為： BFL/TTL = 0.29 ；第三實施例中’第四透鏡後表面於有效徑位置的鏡面高度為SAG42，整體取像光學系統的焦距為f，其關係為： 19 201022713 SAG42/f = -0·08 。第三實施例中，該取像光學系統之被攝物成像於電子感光元件上’取像光學系統的光學總長度為TTL ^取像光學糸統的成像尚度為I ingH ’其關係為. m/ImgH=l. 7卜 _ 第三實施例詳細的結構數據如同表5所示，其非球面數據如同表6所示，其中，曲率半徑、厚度及焦距的單位為匪，HF0V定義為最大視角的一半。本發明第四實施例請參閱第4A圖，第四實施例之像差曲線請參閱第4B圖，第四實施例由物侧至像側依序包含：一具正屈折力的第一透鏡10，其材質為塑膠，第一透鏡10的前表面11為凸面，後表面12為凹面，另第一透鏡10 ^ 的前表面11與後表面12皆設置有非球面；一具負屈折力的第二透鏡20，其材質為塑膠，第二透鏡20的前表面21為凸面，後表面22為凹面，另第二透鏡的前表面21與後表面22皆設置有非球面；一具正屈折力的第三透鏡30，其材質為塑膠，第三透鏡30的前表面31為凹面，後表面32為凸面，另第三透鏡30 的前表面31與後表面32皆設置有非球面；一具負屈折力的第四透鏡40，其材質為塑膠，第四透 20 201022713 鏡40的前表面41為凹面，且後表面42為凹面，另第四透鏡 40的前表面41與後表面42皆設置有非球面，且第四透鏡40 的後表面42設置有反曲點；一光圈50，置於第一透鏡10與第二透鏡20之間；一紅外線濾除濾光片（IR Filter)60，置於第四透鏡 40之後，其不影響系統的焦距；一成像面70，置於紅外線濾除濾光片60之後。第四實施例非球面曲線方程式的表示式如同第一實施例的型式。第四實施例中，整體取像光學系統的焦距為f，第一透鏡的焦距為fl，第三透鏡的焦距為f3，其關係為： f = 3. 41 mm ; 義 f/fl = 1.31 ; ❿ f/f3 = 1.34 。第四實施例中，第一透鏡折射率為N1，第二透鏡折射率為N2，其關係為： | N1-N2 卜 0·088 。第四實施例中，第一透鏡色散係數（Abbe Number)為 21 201022713 VI，第三透鏡色散係數為V3，第四透鏡色散係數為V4，其關係為： | V1-V3 | - 0. 0 ； | V3-V4 | = 0.4。第四實施例中，第二透鏡的前表面曲率半徑為R3，第二透鏡的後表面曲率半徑為R4,第四透鏡的前表面曲率半徑為R7，第四透鏡的後表面曲率半徑為R8，其關係為： (R3+R4)/(R3-R4) = 2. 72 ； R7/R8 = -76.46 。第四實施例中，光圈至成像面的距離為SL，取像光學系統的光學總長度為TTL，其關係為： SL/TTL = 0. 84。第四實施例中，第四透鏡後表面至成像面於光轴上的距離為BFL，取像光學系統的光學總長度為1*11，其關係為. BFL/TTL = 0. 26。第四實施例中，第四透鏡後表面於有效徑位置的鏡面高度為SAG42，整體取像光學系統的焦距為f ’其關係為’ SAG42/f = -0.08 。 22 201022713 第四實施例中’該取像光學系統之被攝物成像於電子感光元件上’取像光學系統的光學總長度為TTL，取像光學系統的成像高度為ImgH，其關係為： TTL/ImgH=l·72 。第四實施例詳細的結構數據如同表7所示，其非球面數據如同表8所示，其中，曲率半徑、厚度及焦距的單位 _ 為mm，HF0V定義為最大視角的一半。在本發明取像光學系統中，透鏡的材質可為玻璃或塑曝，若透鏡的材質為玻璃，則可以增加系統屈折力配置的自由度，若透鏡材質為塑膠，則可以有效降低生產成本。在此先订述明，表丨至表8所示為取像光學系統實施例 ♦同數值變化表’然本發明各個實施例的數值變化皆屬 2所得，即使使用列數值，㈣結_產品仍應屬於程犬2保護1㈣表9為各個實施騎應本個相關方程式的數值資料。综上所述，本發明構、排列方式與鏡像光學系統，藉此透鏡結 ““的解像力；所財發明之『具有產業之可利用 23 201022713 性』應已毋庸置疑，除此之外’在本案實施例所揭露出的特徵技術，於申請之前並未曾見於諸刊物，亦未曾被公開使用，不但具有如上所述功效增進之事實，更具有不可輕忽的附加功效，是故，本發明的『新穎性』以及『進步性』都已符合專利法規，爰依法提出發明專利之申請’析請惠予審查並早曰賜准專利，實感德便。【圖式簡單說明】第1A圖本發明第一實施例光學系統示意圖。第1B圖本發明第一實施例之像差曲線圖。第2A圖本發明第二實施例光學系統示意圖。第2B圖本發明第二實施例之像差曲線圖。第3A圖本發明第三實施例光學系統示意圖。第3B圖本發明第三實施例之像差曲線圖。第4A圖本發明第四實施例光學系統示意圖。第4B圖本發明第四實施例之像差曲線圖。【表簡單說明】表1本發明第一實施例結構數據。表2本發明第一實施例非球面數據。表3本發明第二實施例結構數據。表4本發㈣二實施例非球面數據。 24 201022713 表5本發明第三實施例結構數據。表6本發明第三實施例非球面數據。表7本發明第四實施例結構數據。表8本發明第四實施例非球面數據。表9本發明各個實施例對應相關關係式的數值資料。【主要元件符號說明】The A rate is N2, and the relationship is: Brother's law shot | N1-N2 | = 0.〇88 〇12 201022713 In the first embodiment, the 'first lens dispersion coefficient (Abbe Number) is VI ' The three-lens dispersion coefficient is V3, and the fourth lens dispersion coefficient is V4, and the relationship is . V1-V3 | = 0. 0; | V3-V4 丨=32·5. In the first embodiment, the radius of curvature of the front surface of the second lens is R3, the radius of curvature of the rear surface of the second lens is R4, the radius of curvature of the front surface of the fourth lens is R7, and the radius of curvature of the back surface of the fourth lens is R8. , the relationship is: (R3 + R4) / (R3-R4) = -7.14; R7/R8 = -33.39. In the first embodiment, the distance from the aperture to the imaging surface is SL, and the total optical length of the imaging optical system is TTL, and the relationship is: SL/TTL = 0.87. In the first embodiment, the distance from the rear surface of the fourth lens to the imaging plane on the optical axis is BFL, and the total optical length of the image taking optical system is TTL, and the relationship is: BFL/m = 0·23. In the first embodiment, the mirror height of the rear surface of the fourth lens at the effective diameter position is SAG42, and the focus of the overall image taking optical system is f, and the relationship is: 13 201022713 SAG42/f = -0.06 . In the first embodiment, the object of the image taking optical system is imaged on the electronic photosensitive element, the total optical length of the image taking optical system is TTL, and the imaging surface of the image capturing optical system is I ingH *, the relationship is: TTL/ImgH=l. 75. The detailed structural data of the first embodiment is shown in Table 1, and the aspherical Ο data is as shown in Table 2, in which the radius of curvature, thickness, and focal length are in mm, and HFOV is defined as half of the maximum viewing angle. For the second embodiment of the present invention, please refer to FIG. 2A. For the aberration curve of the second embodiment, refer to FIG. 2B. The second embodiment includes, from the object side to the image side, a first lens 10 having a positive refractive power. The material is plastic, the front surface 11 of the first lens 10 is convex, the rear surface 12 is concave, and the front surface 11 and the rear surface 12 of the first lens 10 are both provided with an aspheric surface; a negative refractive power The second lens 20 is made of plastic, the front surface 21 of the second lens 20 is concave, the rear surface 22 is convex, and the front surface 21 and the rear surface 22 of the second lens 20 are both provided with an aspheric surface; The third lens 30 of the force is made of plastic, the front surface 31 of the third lens 30 is convex, the rear surface 32 is convex, and the front surface 31 and the rear surface 32 of the third lens 30 are both provided with an aspheric surface; 14 201022713 A fourth lens 40 having a negative refractive power is made of plastic, the front surface 41 of the fourth lens 40 is a concave surface, the rear surface 42 is a concave surface, and the front surface 41 and the rear surface 42 of the fourth lens 40 are both disposed. a spherical surface, and the rear surface 42 of the fourth lens 40 is provided with an inflection point; an aperture 50 Between the first lens 10 and the second lens 20; an infrared filter (IR Filter) 60, placed after the fourth lens 40, which does not affect the focal length of the system; an imaging surface 70, placed in the infrared After the filter 60 is filtered out. The expression of the aspheric curve equation of the second embodiment is the same as that of the first embodiment. In the second embodiment, the focal length of the overall imaging optical system is f, the focal length of the first lens is fl, and the focal length of the third lens is f3, the relationship is: ❹ f = 3. 30 mm; f/fl = 1. 19 ; f/f3 = 1. 04. In the second embodiment, the first lens has a refractive index of N1 and the second lens has a refractive index of N2, and the relationship is: 丨 N1 - N2 丨 = 0.088. 15 201022713 In the second embodiment, 'the first lens dispersion coefficient (Abbe Number) is VI, the third lens dispersion coefficient is V3, and the fourth lens dispersion coefficient is V4, and the relationship is: | V1-V3 | = 0. 0; | V3-V4 Bu 0.0. In the second embodiment, 'the front surface has a radius of curvature R3, the second lens has a rear surface radius of curvature R4, the fourth lens has a front surface radius of curvature R7, and the fourth lens has a back surface radius of curvature of 1^ 8, the relationship is: (R3 + R4) / (R3-R4) = -4.00; R7 / R8 = -2.93. In the second embodiment, the distance from the aperture to the imaging surface is SL, and the total optical length of the image taking optical system is TTL, and the relationship is: SL/TTL = 〇·88. In the second embodiment, the distance from the rear surface of the fourth lens to the imaging surface on the optical axis is BFL, and the total optical length of the image taking optical system is TTL, and the relationship is: BFL/TTL = 0.26; The mirror height of the rear surface of the 'fourth lens at the effective diameter position is SAG42, and the focal length of the overall imaging optical system is f'. The relationship is: 201022713 SAG42/f = -0.〇3. In the second embodiment, the object of the image taking optical system is imaged on the electronic photosensitive element, the total optical length of the image taking optical system is TTL, and the imaging south degree of the image taking optical system is I mgH, and the relationship is TTL /ImgH=1.85. The detailed structural data of the second embodiment is shown in Table 3, and the aspherical data is as shown in Table 4, in which the unit of curvature radius, thickness, and focal length is 匪, and HFOV is defined as half of the maximum angle of view. For a third embodiment of the present invention, please refer to FIG. 3A. For the aberration curve of the third embodiment, refer to FIG. 3B. The third embodiment includes, from the object side to the image side, a first lens 10 having a positive refractive power. 'The material is plastic, the front surface 11 of the first lens 10 is convex, the rear surface 12 is convex, and the front surface 11 and the back surface 12 of the first lens 1 are both provided with an aspheric surface; a negative refractive power The second lens 20 is made of plastic, the front surface 21 of the second lens 20 is concave, the rear surface 22 is concave, and the front surface 21 and the rear surface 22 of the second lens are both provided with an aspheric surface; The third lens 30 is made of plastic, the front surface 31 of the third lens 30 is concave, and the rear surface 32 is convex. The front surface 31 and the rear surface 32 of the third lens 3 are both provided with an aspheric surface. 17 201022713 The fourth lens 40 having a negative refractive power is made of plastic, the front surface 41 of the fourth lens 40 is a concave surface, the rear surface 42 is a concave surface, and the front surface 41 and the rear surface 42 of the fourth lens 40 are both provided with an aspheric surface. And the rear surface 42 of the fourth lens 40 is provided with an inflection point; an aperture 50, Between the first lens 10 and the second lens 20; an infrared ray filter, an optical film (IR F i ter ter) 60, placed after the fourth lens 40, which does not affect the focal length of the system; an imaging surface 70, After the infrared filter filter 60 is placed. The expression of the aspheric curve equation of the third embodiment is the same as that of the first embodiment. In the third embodiment, the focal length of the overall imaging optical system is f, the focal length of the first lens is fl, and the focal length of the third lens is f3, the relationship is: f = 3.35 mm; f/fl = 1. 75 f/f3 = 1. 2 In the third embodiment, the first lens has a refractive index of N1 and the second lens has a refractive index of N2, and the relationship is: | N1-N2 | = 0.088. 18 201022713 In the third embodiment, 'the first lens dispersion coefficient (Abbe Number) is VI, the third lens dispersion coefficient is V3', and the fourth lens dispersion coefficient is 乂4, the relationship is: | V1-V3 | = 0. 1 ; | V3-V4 | Two 0. 0. In the third embodiment, 'the front surface has a radius of curvature R3, the second lens has a rear surface radius of curvature R4, the fourth lens has a front surface curvature radius of R7, and the fourth lens has a back surface curvature half of which is R8. , the relationship is: (R3 + R4) / (R3-R4) = 0. 96; R7 / R8 = -63.9 In the third embodiment, the distance from the aperture to the imaging surface is SL, the optical total length of the image taking optical system The degree is m, and the relationship is: SL/TTL = 0. 87. In the third embodiment, the distance from the rear surface of the fourth lens to the imaging surface on the optical axis is BFL, and the total optical length of the image taking optical system is TTL, and the relationship is: BFL/TTL = 0.29; The mirror surface height of the rear surface of the fourth lens at the effective diameter position is SAG42, and the focal length of the overall image taking optical system is f, the relationship is: 19 201022713 SAG42/f = -0·08 . In the third embodiment, the object of the image taking optical system is imaged on the electronic photosensitive element. The total optical length of the image taking optical system is TTL. The imaging visibility of the image capturing optical system is I ingH '. m/ImgH=l. 7b_ The detailed structural data of the third embodiment is shown in Table 5. The aspherical data is as shown in Table 6, in which the unit of curvature radius, thickness and focal length is 匪, and HF0V is defined as the maximum. Half of the perspective. For the fourth embodiment of the present invention, please refer to FIG. 4A. For the aberration curve of the fourth embodiment, refer to FIG. 4B. The fourth embodiment includes, from the object side to the image side, a first lens 10 having a positive refractive power. The front surface 11 of the first lens 10 is a convex surface, and the rear surface 12 is a concave surface. The front surface 11 and the rear surface 12 of the first lens 10 ^ are both provided with an aspheric surface; a negative refractive power The second lens 20 is made of plastic, the front surface 21 of the second lens 20 is convex, the rear surface 22 is concave, and the front surface 21 and the rear surface 22 of the second lens are both provided with an aspheric surface; The third lens 30 is made of plastic, the front surface 31 of the third lens 30 is concave, the rear surface 32 is convex, and the front surface 31 and the rear surface 32 of the third lens 30 are both provided with an aspheric surface; The fourth lens 40 of the force is made of plastic, and the front surface 41 of the mirror 40 is concave, and the rear surface 42 is concave, and the front surface 41 and the rear surface 42 of the fourth lens 40 are both disposed. a spherical surface, and the rear surface 42 of the fourth lens 40 is provided with an inflection point; an aperture 50 Between the first lens 10 and the second lens 20; an infrared filter (IR Filter) 60, placed after the fourth lens 40, which does not affect the focal length of the system; an imaging surface 70, placed After the infrared filter filter 60 is removed. The expression of the aspheric curve equation of the fourth embodiment is the same as that of the first embodiment. In the fourth embodiment, the focal length of the overall imaging optical system is f, the focal length of the first lens is fl, and the focal length of the third lens is f3, the relationship is: f = 3.41 mm; meaning f/fl = 1.31; ❿ f/f3 = 1.34. In the fourth embodiment, the refractive index of the first lens is N1, and the refractive index of the second lens is N2, and the relationship is: | N1-N2 Bu 0·088 . In the fourth embodiment, the first lens dispersion coefficient (Abbe Number) is 21 201022713 VI, the third lens dispersion coefficient is V3, and the fourth lens dispersion coefficient is V4, and the relationship is: | V1-V3 | - 0. 0; | V3-V4 | = 0.4. In the fourth embodiment, the radius of curvature of the front surface of the second lens is R3, the radius of curvature of the back surface of the second lens is R4, the radius of curvature of the front surface of the fourth lens is R7, and the radius of curvature of the back surface of the fourth lens is R8. The relationship is: (R3+R4)/(R3-R4) = 2.72; R7/R8 = -76.46. In the fourth embodiment, the distance from the aperture to the imaging surface is SL, and the total optical length of the imaging optical system is TTL, and the relationship is: SL/TTL = 0.84. In the fourth embodiment, the distance from the rear surface of the fourth lens to the optical axis on the optical axis is BFL, and the total optical length of the optical system is 1*11, and the relationship is BFL/TTL = 0.26. In the fourth embodiment, the mirror height of the rear surface of the fourth lens at the effective diameter position is SAG42, and the focal length of the overall image taking optical system is f', and the relationship is 'SAG42/f = -0.08. 22 201022713 In the fourth embodiment, the object of the image taking optical system is imaged on the electronic photosensitive element. The total optical length of the image taking optical system is TTL, and the imaging height of the image capturing optical system is ImgH. The relationship is: TTL /ImgH=l·72. The detailed structural data of the fourth embodiment is as shown in Table 7, and the aspherical data is as shown in Table 8, in which the unit of curvature radius, thickness, and focal length _ is mm, and HF0V is defined as half of the maximum angle of view. In the image taking optical system of the present invention, the material of the lens can be glass or plastic. If the material of the lens is glass, the degree of freedom of the system's refractive power can be increased. If the lens is made of plastic, the production cost can be effectively reduced. It is stated here that Table 丨 to Table 8 shows an embodiment of the image taking optical system ♦ the same value change table. However, the numerical values of the various embodiments of the present invention are all obtained by 2, even if the column value is used, (4) knot _ product It should still belong to Cheng Han 2 Protection 1 (4) Table 9 is the numerical data of each relevant equation for riding. In summary, the structure, the arrangement and the mirror optical system of the present invention, by means of the lens, "the resolution of the lens; the invention of the invention has the property of 23 201022713" should be unquestionable, in addition to The feature technology disclosed in the embodiment of the present invention has not been seen in publications before the application, nor has it been used publicly. It not only has the fact that the effect is improved as described above, but also has an additional effect that cannot be neglected. Therefore, the present invention Both the novelty and the "progressiveness" have been in compliance with the patent laws and regulations, and the application for the invention of patents in accordance with the law has been submitted to the review and the patents have been granted as soon as possible. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1A is a schematic view showing an optical system of a first embodiment of the present invention. Fig. 1B is a diagram showing aberrations of the first embodiment of the present invention. 2A is a schematic view of an optical system of a second embodiment of the present invention. Fig. 2B is a diagram showing aberrations of the second embodiment of the present invention. Figure 3A is a schematic view of an optical system of a third embodiment of the present invention. Fig. 3B is a graph showing the aberration of the third embodiment of the present invention. 4A is a schematic view of an optical system of a fourth embodiment of the present invention. Fig. 4B is a diagram showing the aberration of the fourth embodiment of the present invention. [Table Description] Table 1 shows the structure data of the first embodiment of the present invention. Table 2 Aspherical data of the first embodiment of the present invention. Table 3 shows the structural data of the second embodiment of the present invention. Table 4 shows the aspherical data of the second embodiment of the present invention. 24 201022713 Table 5 Structure data of the third embodiment of the present invention. Table 6 shows aspherical data of a third embodiment of the present invention. Table 7 shows the structural data of the fourth embodiment of the present invention. Table 8 shows aspherical data of a fourth embodiment of the present invention. Table 9 shows numerical data corresponding to correlation equations in various embodiments of the present invention. [Main component symbol description]

第一透鏡10 前表面11 後表面12 第二透鏡20 前表面21 後表面22 第三透鏡30 前表面31 後表面32 第四透鏡40 前表面41 後表面42 光圈50 紅外線濾除濾光片60 成像面70 整體取像光學系統的焦距第一透鏡的焦距Π 第三透鏡的焦距f3 第一透鏡折射率N1 25 201022713 第二透鏡折射率N2First lens 10 front surface 11 rear surface 12 second lens 20 front surface 21 rear surface 22 third lens 30 front surface 31 rear surface 32 fourth lens 40 front surface 41 rear surface 42 aperture 50 infrared filter 50 imaging Face 70 focal length of the overall imaging optical system focal length of the first lens 焦 focal length f3 of the third lens refractive index of the first lens N1 25 201022713 refractive index of the second lens N2

第一透鏡色散係數VI 第三透鏡色散係數V3 第四透鏡色散係數V4 第二透鏡的前表面曲率半徑R3 第二透鏡的後表面曲率半徑R4 第四透鏡的前表面曲率半徑R7 第四透鏡的後表面曲率半徑R8First lens dispersion coefficient VI third lens dispersion coefficient V3 fourth lens dispersion coefficient V4 front surface curvature radius R3 of the second lens second surface curvature radius R4 of the second lens front surface curvature radius R7 of the fourth lens Surface curvature radius R8

光圈至成像面的距離SLAperture to image plane distance SL

第四透鏡後表面至成像面於光軸上的距離BFL 第四透鏡後表面於有效徑位置的鏡面高度SAG42The distance from the rear surface of the fourth lens to the optical axis on the optical axis BFL The mirror height SAG42 of the rear surface of the fourth lens at the effective diameter position

取像光學系統的光學總長度TTLOptical total length TTL of the optical system

取像光學系統的成像高度ImgH 26Imaging height of imaging optical system ImgH 26

Claims

201022713 七、申請專利範圍： 1. 一種取像光學系統，由物側至像側依序包含：一具正屈折力的第一透鏡，其前表面為凸面；一光圈；一具負屈折力的第二透鏡；一第三透鏡，其前表面為凸面；以及一具負屈折力的第四透鏡，其前表面為凹面，第四透鏡後表面設置有非球面，第四透鏡後表面設置有反曲點；第四透鏡後表面至成像面於光軸上的距離為BFL，取像光學系統的光學總長度為TTL，其關係為：BFL/TTL>0. 12， φ 取像光學系統中，具屈折力的透鏡僅為四片。 2. 如申請專利範圍第1項所述之取像光學系統，其中，第四透鏡後表面為凹面，第四透鏡為塑膠材質，第四透鏡前表面設置有非球面。 3. 如申請專利範圍第2項所述之取像光學系統，其中，第二透鏡後表面為凸面，第二透鏡設置有非球面。 4. 如申請專利範圍第3項所述之取像光學系統，其 © 中，第三透鏡為正屈折力，第三透後表面為凸面，第三透鏡設置有非球面。 5. 如申請專利範圍第4項所述之取像光學系統，其中，第二透前表面為凹面，第二透鏡為塑膠材質，第二透鏡前表面及後表面皆設置有非球面。 6. 如申請專利範圍第5項所述之取像光學系統，其中，整體取像光學系統的焦距為f，第一透鏡的焦距為Π，其關係為：0.8<f/fl<1.45。 27 201022713 7. %申請專利範圍第6項所述之取像光學系統，其 1 ’整體取像光學系統的焦距為f，第三透鏡的焦距為f3， /、關係為：〇<f/f3<〇 π。 ^如申請專利範圍第5項所述之取像光學系統，其中’第一透鏡色散係數為VI，第三透鏡色散係數為V3，第四透鏡色散係數為V4，其關係為： I V1-V3 | <15 ； I V3-V4 | >15 〇 ❷ 9·如申請專利範圍第5項所述之取像光學系統，其中’第一透鏡折射率為N1，第二透鏡折射率為N2，其關係為：I N卜N2 | <〇. 12。 10.如申請專利範圍第2項所述之取像光學系統，其中’光圈至成像面的距離為SL，取像光學系統的光學總長度為TTL ’其關係為：sl/TTL<0. 92。 11·如申請專利範圍第10項所述之取像光學系統，其中’該取像光學系統之被攝物成像於電子感光元件上，取 © 像光學系統的光學總長度為TTL，取像光學系統的成像高度為ImgH，其關係為：TTL/ImgH<2. 10。 12. 如申請專利範圍第11項所述之取像光學系統，其中，該取像光學系統之被攝物成像於電子感光元件上’取像光學系統的光學總長度為TTL，取像光學系統的成像高度為 ImgH，其關係為：TTL/ImgH〈l· 95。 13. 如申請專利範圍第10項所述之取像光學系統’其中，第四透鏡後表面於有效徑位置的鏡面尚度為SAG42 ’ 28 201022713 整體取像光學系統的焦距為f，其關係為 :SAG42/f<-0·02〇201022713 VII. Patent application scope: 1. An image taking optical system, which includes: from the object side to the image side: a first lens with positive refractive power, the front surface of which is convex; an aperture; a negative refractive power a second lens; a third lens having a front surface that is convex; and a fourth lens having a negative refractive power, the front surface of which is a concave surface, the rear surface of the fourth lens is provided with an aspherical surface, and the rear surface of the fourth lens is provided with a reverse The curved point; the distance from the rear surface of the fourth lens to the optical axis on the optical axis is BFL, and the total optical length of the optical system is TTL, and the relationship is: BFL/TTL>0. 12, φ in the optical system, The lens with refractive power is only four pieces. 2. The image taking optical system according to claim 1, wherein the rear surface of the fourth lens is a concave surface, the fourth lens is made of a plastic material, and the front surface of the fourth lens is provided with an aspherical surface. 3. The image taking optical system according to claim 2, wherein the second lens rear surface is convex and the second lens is provided with an aspheric surface. 4. The image taking optical system according to claim 3, wherein the third lens has a positive refractive power, the third rear surface is a convex surface, and the third lens is provided with an aspheric surface. 5. The image taking optical system according to claim 4, wherein the second front surface is a concave surface, the second lens is a plastic material, and the front surface and the rear surface of the second lens are provided with an aspheric surface. 6. The image taking optical system according to claim 5, wherein the focal length of the overall image taking optical system is f, and the focal length of the first lens is Π, the relationship is: 0.8 < f / fl < 1.45. 27 201022713 7. % of the imaging optical system described in claim 6 of the patent application, wherein the focal length of the 1' overall imaging optical system is f, the focal length of the third lens is f3, /, and the relationship is: 〇 <f/ F3<〇π. ^ The image taking optical system according to claim 5, wherein 'the first lens has a dispersion coefficient of VI, the third lens has a dispersion coefficient of V3, and the fourth lens has a dispersion coefficient of V4, and the relationship is: I V1-V3 The image taking optical system according to claim 5, wherein the first lens has a refractive index of N1 and the second lens has a refractive index of N2. The relationship is: IN Bu N2 | < 〇. 12. 10. The image taking optical system according to claim 2, wherein the distance from the aperture to the imaging surface is SL, and the total optical length of the image taking optical system is TTL', the relationship is: sl/TTL < 0. 92 . 11. The image taking optical system according to claim 10, wherein the object of the image capturing optical system is imaged on the electronic photosensitive element, and the total optical length of the optical system is TTL, and the image is taken. The imaging height of the system is ImgH, and the relationship is: TTL/ImgH < 2.10. 12. The image taking optical system according to claim 11, wherein the object of the image taking optical system is imaged on the electronic photosensitive element; the total optical length of the image taking optical system is TTL, and the image taking optical system The imaging height is ImgH, and the relationship is: TTL/ImgH<l·95. 13. The image taking optical system as described in claim 10, wherein the mirror surface of the rear surface of the fourth lens at the effective diameter position is SAG42' 28 201022713 The focal length of the overall image taking optical system is f, the relationship is :SAG42/f<-0·02〇

!_// 1 丄 ·丄 d ^!_// 1 丄 ·丄 d ^

15. 中，第一透鏡設开％田。 16.—種取像光學系統，由一具正屈折力的第一透鏡；由物側至像侧依序包含：一光圈；一具負屈折力的第二透鏡；凸面；以及一具正屈折力第三透鏡，其前表面為1HJ面，後表面為 /一具負屈折力的第四透鏡，其前表面為凹面，第四透鏡後表面設置有非球面，第四透鏡後表面設置有反曲點；取像光學系統中，具屈折力的透鏡僅為四片。 17. 如申請專利範園第16項所述之取像光學系統，其中，第四透鏡後表面為凹面，第四透鏡為塑膠材質，第四透鏡前表面及後表面皆設置有非球面。 18. 如申請專利範園第17項所述之取像光學系統，其中，第二透鏡為塑膠材質，第二透鏡前表面及後表面皆設置有非球面，第三透鏡為塑膠材質，第三透鏡前表面及後表面皆設置有非球面，光圈至成像面的距離為SL，取像光學系統的光學總長度為TTL，其關係為：SL/TTLC0.92。 29 201022713 19. 如申請專利範圍第18項所述之取像光學系統，其中，第一透鏡前表面為凸面，第二透鏡前表面為凹面。 20. 如申請專利範圍第19項所述之取像光學系統，其中，第一透鏡後表面為凸面，第二透鏡後表面為凹面。 21. 如申請專利範圍第18項所述之取像光學系統’其中，第四透鏡後表面至成像面於光軸上的距離為BFL ’取像光學系統的光學總長度為TTL，其關係為： BFL/TTL>0· 12;該取像光學系統之被攝物成像於電子感光 φ 元件上，取像光學系統的光學總長度為TTL，取像光學系統的成像高度為ImgH，其關係為：TTL/ImgH<1.95 ° 22. 如申請專利範圍第20項所述之取像光學系統’其中，第四透鏡後表面於有效徑位置的鏡面高度為SAG42, 整體取像光學系統的焦距為f，其關係為：SAG42/f <_0. 02。 23. 如申請專利範圍第18項所述之取像光學系統，其中，第二透鏡的前表面曲率半徑為们’第一透鏡的後表面曲率半徑為R4，其關係為：-2. 0<(R3+R4)/(R3-R4)<5· 0。 ❹ 24. 如申請專利範圍第22項所述之取像光學系統’其中，第四透鏡的前表面曲率半徑為R7’第四透鏡的後表面曲率半徑為R8，其關係為：R7/R8〈-5·0。 25. 如申請專利範圍第20項所述之取像光學系統，其中，第一透鏡折射率為Ν1，第二透鏡折射率為Ν2，其關係為：IN1-N2 | <0.12 。 26. —種取像光學系統，由物侧至像侧依序包含： 30 201022713 一具正屈折力的第一透鏡’其前表面凸面’後表面為凹面；一光圈；一具負屈折力的第二透鏡，其前表面為凸面，後表面為凹面，第二透鏡為塑膠材質，第二透鏡前表面及後面皆設置有非球面；一具正屈折力的第三透鏡，其前表面為凹面，後表面為凸面，第三透鏡為塑膠材質，第三透鏡前表面及後表面皆設置有非球面；以及一具負屈折力的第四透鏡，其前表面為凹面，後表面 ⑩為凹面，第四透鏡為塑膠材質，第四透鏡前表面及後表面皆設置有非球面，第四透鏡後表面設置有反曲點；光圈至成像面的距離為SL，取像光學系統的光學總長度為TTL ’ 其關係為：SL/TTL<〇. 92 ;取像光學系統中’具屈折力的透鏡僅為四片。 27. 如申請專利範圍第26項所述之取像光學系統，其中’第四透鏡後表面至成像面於光轴上的距離為BFL，取像光學系統的光學總長度為TTL，其關係為： BFL/TTL>0· 12;該取像光學系統之被攝物成像於電子感光 ❹元件上’取像光學系統的光學總長度為TTL ’取像光學系統的成像高度為ImgH，其關係為：TTL/ImgH<l. 95。 28. 如申請專利範圍第26項所述之取像光學系統，其中，第一透鏡折射率為N1，第二透鏡折射率為N2，其關係為：丨N1-N2丨<0.12;第四透鏡後表面於有效徑位置的^ 面高度為SAG42，整體取像光學系統的焦距為f，盆關後為：SAG42/f<-0. 02。 ’、’、 29. —種取像光學系統，由物側至像側依序包含： 31 201022713 一具正屈折力的第一透鏡；一具負屈折力的第二透鏡，其前表面為凹面’後表面為凸面，第二透鏡為塑膠材質，第二透鏡前表面及後面皆设置有非球面；一具正屈折力的第三透鏡，其前表面為凸面；以及一具負屈折力的第四透鏡，其前表面為凹面，第四透鏡為塑膠材質，第四透鏡後表面設置有非球面，第四透鏡後表面設置有反曲點；第四透鏡後表面至成像面於光轴上的距離為BFL，取像光學系統的光學總長度為了孔，其關係為·· BFL/TTL>0. 12 ;取像光學系統中’具屈折力的透鏡僅 φ 為四片。 30. 如申請專利範圍第29項所述之取像光學系統，其中，第一透鏡前表面為凸面，第三透鏡後表面為凸面，第三透鏡設置有非球面，第四透鏡後表面為凹面，第四透鏡前表面設置有非球面。 31. 如申請專利範圍第30項所述之取像光學系統，复中’第一透鏡折射率為N1，第二透鏡折射率為N2，'装^ : 為：丨 N卜N2 | <〇. 12。 φ 32. 如申請專利範圍第30項所述之取像光學系中，該取像光學系統之被攝物成像於電子感光徠冼，其像光學系統的光學總長度為TTL·，取像光學系絲上，取度為ImgH，其關係為：TTL/ImgH<1.95。、、'成像高 3215. In the middle, the first lens is set to open. 16. The image taking optical system consists of a first lens having a positive refractive power; the object side to the image side sequentially comprises: an aperture; a second lens having a negative refractive power; a convex surface; and a positive inflection The third lens has a front surface of 1HJ surface, a rear surface of / a fourth lens having a negative refractive power, a front surface of which is a concave surface, a rear surface of the fourth lens is provided with an aspherical surface, and a rear surface of the fourth lens is provided with a reverse surface. Curved points; in the image-taking optical system, the lens with refractive power is only four pieces. 17. The image taking optical system according to claim 16, wherein the rear surface of the fourth lens is a concave surface, the fourth lens is made of a plastic material, and the front surface and the rear surface of the fourth lens are all provided with an aspheric surface. 18. The image taking optical system according to claim 17, wherein the second lens is made of a plastic material, the front surface and the rear surface of the second lens are all provided with an aspherical surface, and the third lens is made of a plastic material, and the third lens is a plastic material. The front surface and the rear surface of the lens are all provided with an aspherical surface, the distance from the aperture to the imaging surface is SL, and the total optical length of the image taking optical system is TTL, and the relationship is: SL/TTLC 0.92. The imaging optical system of claim 18, wherein the front surface of the first lens is a convex surface and the front surface of the second lens is a concave surface. 20. The imaging optical system of claim 19, wherein the rear surface of the first lens is a convex surface and the rear surface of the second lens is a concave surface. 21. The image taking optical system of claim 18, wherein the distance from the rear surface of the fourth lens to the optical axis of the imaging surface is the total optical length of the BFL 'image taking optical system is TTL, the relationship is : BFL/TTL>0·12; the object of the image taking optical system is imaged on the electronic photosensitive φ element, the total optical length of the image taking optical system is TTL, and the imaging height of the image taking optical system is ImgH, the relationship is : TTL / ImgH < 1.95 ° 22. The imaging optical system of claim 20, wherein the mirror surface height of the rear surface of the fourth lens at the effective diameter position is SAG42, and the focal length of the overall imaging optical system is f The relationship is: SAG42/f <_0. 02. 23. The imaging optical system of claim 18, wherein the radius of curvature of the front surface of the second lens is 'the radius of curvature of the rear surface of the first lens is R4, the relationship is: - 2. 0; (R3+R4)/(R3-R4)<5·0. ❹ 24. The image taking optical system of claim 22, wherein the front surface of the fourth lens has a radius of curvature R7' and the radius of curvature of the rear surface of the fourth lens is R8, the relationship is: R7/R8< -5·0. 25. The image taking optical system according to claim 20, wherein the first lens has a refractive index of Ν1 and the second lens has a refractive index of Ν2, and the relationship is: IN1-N2 | < 0.12. 26. An image taking optical system comprising from the object side to the image side in sequence: 30 201022713 A first lens having a positive refractive power 'the front surface convex surface' has a concave surface; an aperture; a negative refractive power The second lens has a convex surface on the front surface, a concave surface on the rear surface, a plastic material on the second lens, an aspheric surface on the front surface and the back surface of the second lens, and a concave surface on the front surface of the third lens having a positive refractive power. The rear surface is a convex surface, the third lens is made of a plastic material, the front surface and the rear surface of the third lens are all provided with an aspherical surface; and a fourth lens having a negative refractive power, the front surface is a concave surface, and the rear surface 10 is a concave surface. The fourth lens is made of plastic material, the front surface and the rear surface of the fourth lens are all provided with an aspherical surface, the rear surface of the fourth lens is provided with an inflection point; the distance from the aperture to the imaging surface is SL, and the total optical length of the image taking optical system is TTL 'The relationship is: SL / TTL < 〇. 92 ; In the optical system of the image, the lens with a refractive power is only four. 27. The image taking optical system according to claim 26, wherein the distance from the rear surface of the fourth lens to the optical axis on the optical axis is BFL, and the total optical length of the optical system is TTL, the relationship is : BFL / TTL > 0 · 12; the object of the image taking optical system is imaged on the electronic photosensitive element; the total optical length of the image taking optical system is TTL 'the imaging height of the image taking optical system is ImgH, the relationship is :TTL/ImgH<l. 95. 28. The imaging optical system of claim 26, wherein the first lens has a refractive index of N1 and the second lens has a refractive index of N2, the relationship of which is: 丨N1-N2丨<0.12; fourth The height of the rear surface of the lens at the effective diameter position is SAG42, the focal length of the overall imaging optical system is f, and after the basin is closed: SAG42/f<-0. 02. ', ', 29. An image-taking optical system consisting of the object side to the image side in sequence: 31 201022713 A first lens with positive refractive power; a second lens with negative refractive power, the front surface of which is concave 'The rear surface is convex, the second lens is made of plastic material, the front surface and the back surface of the second lens are provided with aspherical surfaces; the third lens with positive refractive power has a convex surface on the front surface; and a negative refractive power The fourth lens has a concave surface on the front surface, the fourth lens is made of a plastic material, the rear surface of the fourth lens is provided with an aspherical surface, the rear surface of the fourth lens is provided with an inflection point, and the rear surface of the fourth lens is disposed on the optical axis of the imaging surface. The distance is BFL, and the total optical length of the image-taking optical system is for the hole, and the relationship is BFL/TTL>0. 12; the lens with refractive power in the image-taking optical system has only φ of four pieces. 30. The image taking optical system according to claim 29, wherein the front surface of the first lens is a convex surface, the rear surface of the third lens is a convex surface, the third lens is provided with an aspherical surface, and the rear surface of the fourth lens is a concave surface. The front surface of the fourth lens is provided with an aspherical surface. 31. The imaging optical system according to claim 30, wherein the first lens has a refractive index of N1 and the second lens has a refractive index of N2, and the device is: 丨NbN2| <〇 12. Φ 32. In the imaging optical system described in claim 30, the object of the image taking optical system is imaged on an electronic photosensitive cymbal, and the optical total length of the image optical system is TTL·, taking image optics On the silk, the degree is ImgH, and the relationship is: TTL/ImgH<1.95. ,, 'Imaging high 32