TWI426316B - Optical imaging system - Google Patents

光學攝影系統Optical photography system

本發明係與光學攝影系統有關，特別是指一種應用於電子產品的小型化四片式的光學攝影系統。The present invention relates to an optical imaging system, and more particularly to a miniaturized four-piece optical imaging system for use in electronic products.

最近幾年來，隨著具有攝像功能之可攜式電子產品的興起，小型化攝像鏡頭的需求日漸提高，而一般攝像鏡頭的感光元件不外乎是感光耦合元件(Charge Coupled Device,CCD)或互補性氧化金屬半導體元件(Complementary Metal-Oxide Semiconductor Sensor,CMOS Sensor)兩種，且由於製程技術的精進，使得感光元件的畫素尺寸縮小，小型化攝像鏡頭逐漸往高畫素領域發展，因此，對成像品質的要求也日益增加。In recent years, with the rise of portable electronic products with camera functions, the demand for miniaturized camera lenses has been increasing, and the photosensitive elements of general camera lenses are nothing more than Charge Coupled Devices (CCD) or complementary. Two types of Complementary Metal-Oxide Semiconductor Sensors (CMOS Sensors), and due to the advancement of process technology, the pixel size of the photosensitive element is reduced, and the miniaturized camera lens is gradually developing into the high-pixel field. Therefore, The requirements for image quality are also increasing.

傳統搭載於可攜式電子產品上的小型化攝像鏡頭，多採用三片式透鏡結構為主，透鏡系統由物側至像側依序為一具正屈折力的第一透鏡、一具負屈折力的第二透鏡及一具正屈折力的第三透鏡，如美國專利第7,145,736號所示。The miniaturized camera lens that is traditionally used in portable electronic products mainly uses a three-piece lens structure. The lens system is a first lens with a positive refractive power and a negative refractive index from the object side to the image side. A second lens of force and a third lens of positive refractive power are shown in U.S. Patent No. 7,145,736.

由於製程技術的進步與電子產品往輕薄化發展的趨勢下，感光元件畫素尺寸不斷地縮小，使得系統對成像品質的要求更加提高，習知的三片式透鏡組將無法滿足更高階的攝像鏡頭模組。Due to the advancement of process technology and the trend of thinner and lighter electronic products, the size of the photosensitive element is continuously reduced, which makes the system more demanding on image quality. The conventional three-piece lens group will not be able to meet higher-order imaging. Lens module.

美國專利第7,365,920號揭露了一種四片式透鏡組，其中第一透鏡及第二透鏡係以二片玻璃球面鏡互相黏合而成為Doublet(雙合透鏡)，用以消除色差，但此方法有其缺點，其一，過多的玻璃球面鏡配置使得系統自由度不足，導致系統的總長度不易縮短；其二，玻璃鏡片黏合的製程不易，容易形成製造上的困難。U.S. Patent No. 7,365,920 discloses a four-piece lens assembly in which a first lens and a second lens are bonded to each other by a two-piece glass spherical mirror to form a Doublet (doublet lens) for eliminating chromatic aberration, but this method has its disadvantages. First, the excessive glass spherical mirror configuration makes the system freely insufficient, resulting in the system's total length is not easy to shorten; Second, the glass lens bonding process is not easy, and it is easy to form manufacturing difficulties.

為了可以擁有較大的視角、有效縮小鏡頭體積，且能獲得較高的解像力，本發明提供一種由四片透鏡構成的光學攝影系統，其要旨如下：In order to have a larger viewing angle, effectively reduce the lens volume, and obtain a higher resolution, the present invention provides an optical imaging system composed of four lenses, the gist of which is as follows:

一種光學攝影系統，由物側至像側依序包含：一具負屈折力的第一透鏡，其物側表面為凸面、像側表面為凹面；一具正屈折力的第二透鏡；一具正屈折力的第三透鏡，其物側表面與像側表面皆為非球面；一具負屈折力的第四透鏡，其像側表面為凹面，且該第四透鏡的物側表面與像側表面皆為非球面；該光學攝影系統中具屈折力的透鏡為四片，且該第一透鏡與第二透鏡間的鏡間距為T12，該光學攝影系統的整體焦距為f，該第一透鏡的中心厚度為CT1，該光學攝影系統另設置有一光圈，該光圈至成像面於光軸上的距離為SL，該第一透鏡的物側表面至成像面於光軸上的距離為TTL，滿足下記關係式：0.1<T12/f<0.3；0.30<CT1/f<0.75；0.52<SL/TTL<0.82。An optical photographic system comprising, from the object side to the image side, a first lens having a negative refractive power, the object side surface being a convex surface, the image side surface being a concave surface, and a positive refractive power second lens; a third lens having a positive refractive power, the object side surface and the image side surface are both aspherical surfaces; a fourth lens having a negative refractive power, the image side surface is a concave surface, and the object side surface and the image side of the fourth lens The surface is aspherical; the lens with refractive power in the optical imaging system is four, and the mirror spacing between the first lens and the second lens is T12, and the overall focal length of the optical imaging system is f, the first lens The center thickness of the optical imaging system is CT1. The optical imaging system is further provided with an aperture. The distance from the aperture to the imaging plane on the optical axis is SL, and the distance from the object side surface of the first lens to the imaging plane on the optical axis is TTL, which satisfies The relationship is as follows: 0.1 < T12 / f < 0.3; 0.30 < CT1/f < 0.75; 0.52 < SL / TTL < 0.82.

其中當0.1<T12/f<0.3時，將有利於修正該光學攝影系統的高階像差，且可使該光學攝影系統的鏡組配置較為平衡，有利於縮短該光學攝影系統的光學總長度，以維持鏡頭的小型化，較佳地，係滿足下記關係式：0.07<T12/f<0.50，該光學攝影系統可縮短其光學總長度且提供良好的成像品質；當0.30<CT1/f<0.75時，該第一透鏡的鏡片厚度大小較為合適，可降低製造上的困難以獲得較高的鏡片製作良率；當0.52<SL/TTL<0.82時，可有利於廣視場角的特性，有助於對歪曲(Distortion)及倍率色收差(Chromatic Aberration of Magnification)的修正，且如此的配置可有效降低系統的敏感度。Wherein when 0.1<T12/f<0.3, it will be advantageous to correct the high-order aberration of the optical imaging system, and the mirror configuration of the optical imaging system can be balanced, which is advantageous for shortening the optical total length of the optical imaging system. In order to maintain the miniaturization of the lens, preferably, the following relationship is satisfied: 0.07 < T12 / f < 0.50, the optical imaging system can shorten the total optical length and provide good imaging quality; when 0.30 < CT1/f < 0.75 When the thickness of the lens of the first lens is relatively suitable, the manufacturing difficulty can be reduced to obtain a higher lens manufacturing yield; when 0.52<SL/TTL<0.82, the characteristics of the wide viewing angle can be favored. Helps with corrections to Distortion and Chromatic Aberration of Magnification, and such a configuration can effectively reduce the sensitivity of the system.

本發明光學攝影系統中，該第一透鏡具負屈折力，其物側表面為凸面而像側表面為凹面，係可利於擴大該光學攝影系統的視場角。In the optical imaging system of the present invention, the first lens has a negative refractive power, and the object side surface is convex and the image side surface is concave, which is advantageous for enlarging the angle of view of the optical imaging system.

該第二透鏡具正屈折力，提供系統所需的部分屈折力，有助於縮短該光學攝影系統的總長度。The second lens has a positive refractive power that provides the partial refractive power required by the system to help shorten the overall length of the optical imaging system.

該第三透鏡具正屈折力，可有效分配該第二透鏡的正屈折力，以降低該光學攝影系統的敏感度。本發明光學攝影系統中，當該第三透鏡的物側表面與像側表面皆為凸面時，將可有助於加強該第三透鏡的正屈折力，有助於進一步縮短該光學攝影系統的總長度。The third lens has a positive refractive power that effectively distributes the positive refractive power of the second lens to reduce the sensitivity of the optical imaging system. In the optical imaging system of the present invention, when both the object side surface and the image side surface of the third lens are convex, it will help to strengthen the positive refractive power of the third lens, which helps to further shorten the optical imaging system. Total length.

該第四透鏡具負屈折力，且該像側表面為凹面，可使該光學攝影系統的主點(Principal Point)遠離成像面，有利於縮短光學攝影系統的光學總長度，以促進該光學攝影系統的小型化。此外，該第四透鏡上可設置有反曲點，將可更有效地壓制離軸視場的光線入射於感光元件上的角度，並且可進一步修正離軸視場的像差。The fourth lens has a negative refractive power, and the image side surface is concave, which can make the Principal Point of the optical imaging system away from the imaging surface, which is beneficial to shorten the optical total length of the optical imaging system to facilitate the optical photography. Miniaturization of the system. In addition, the fourth lens may be provided with an inflection point, which can more effectively suppress the angle at which the light of the off-axis field of view is incident on the photosensitive element, and can further correct the aberration of the off-axis field of view.

本發明光學攝影系統中，該第二透鏡的焦距為f2，該第三透鏡的焦距為f3，兩者滿足0.2<f3/f2<0.7關係式時，可使該第三透鏡有效分配系統所需的屈折力，可避免單一透鏡的屈折力過大，進而降低該光學攝影系統的敏感度。In the optical imaging system of the present invention, the focal length of the second lens is f2, and the focal length of the third lens is f3, and when the two satisfy the relationship of 0.2<f3/f2<0.7, the third lens can be effectively allocated to the system. The refractive power of the single lens reduces the refractive power of the single lens, thereby reducing the sensitivity of the optical imaging system.

本發明光學攝影系統中，該第一透鏡與該第二透鏡間彼此具有空氣間距，且該第一透鏡的中心厚度為CT1，該第二透鏡的中心厚度為CT2，兩者滿足0.2<CT2/CT1<0.50關係式時，該第一透鏡與該第二透鏡的厚度不至於過大或過小，有利於各透鏡的組裝配置。In the optical imaging system of the present invention, the first lens and the second lens have an air gap with each other, and the center thickness of the first lens is CT1, and the center thickness of the second lens is CT2, and both satisfy 0.2<CT2/ When the CT1<0.50 relationship, the thickness of the first lens and the second lens is not too large or too small, which is advantageous for the assembly configuration of each lens.

本發明光學攝影系統中，該第一透鏡的焦距為f1，該第四透鏡的焦距為f4，兩者滿足0.2<f4/f1<0.6關係式時，該第一透鏡與該第四透鏡的屈折力配置較為平衡，有利於該光學攝影系統高階像差的補正。另外，當兩者滿足0.2<f4/f1<0.45關係式時，該光學攝影系統高階像差的補正效果更佳。In the optical imaging system of the present invention, the focal length of the first lens is f1, and the focal length of the fourth lens is f4. When the two satisfy the relationship of 0.2<f4/f1<0.6, the inflection of the first lens and the fourth lens The force configuration is more balanced, which is beneficial to the correction of higher-order aberrations of the optical imaging system. In addition, when the two satisfy the relationship of 0.2<f4/f1<0.45, the correction effect of the high-order aberration of the optical imaging system is better.

本發明光學攝影系統中，該第1C圖為本發明SAG32與Y32的示意圖，該第三透鏡的像側表面上光線通過之最大範圍位置與光軸的垂直距離為Y32，該第三透鏡的像側表面上距離光軸為Y32的位置與相切於第三透鏡光軸頂點上之切面的距離為SAG32，兩者滿足0.4<SAG32/Y32<0.6關係式時，可使該第三透鏡的形狀不會太過彎曲，除有利於透鏡的製作與成型外，更有助於降低該光學攝影系統中各透鏡組裝配置所需的空間，使得鏡組的配置可更為緊密。In the optical imaging system of the present invention, the first C-picture is a schematic view of the SAG32 and Y32 of the present invention, wherein the vertical distance of the maximum range position of the light passing through the image side surface of the third lens and the optical axis is Y32, the image of the third lens The distance between the position on the side surface from the optical axis Y32 and the tangent on the apex of the optical axis of the third lens is SAG32, and when the two satisfy the relationship of 0.4<SAG32/Y32<0.6, the shape of the third lens can be made. Not too much bending, in addition to facilitating the fabrication and molding of the lens, it is more helpful to reduce the space required for the assembly of the lenses in the optical imaging system, so that the configuration of the lens group can be more compact.

本發明光學攝影系統中，該第三透鏡的色散係數為V3，該第四透鏡的色散係數為V4，兩者滿足30<V3-V4<42關係式時，將有利於該光學攝影系統中色差的修正。In the optical imaging system of the present invention, the third lens has a dispersion coefficient of V3, and the fourth lens has a dispersion coefficient of V4. When the two satisfy the relationship of 30<V3-V4<42, the color difference in the optical imaging system is facilitated. Correction.

本發明光學攝影系統中，該第一透鏡的物側表面曲率半徑為R1，該第一透鏡的像側表面曲率半徑為R2，兩者滿足2.0<R1/R2<3.0關係時，有助於該光學攝影系統球差(Spherical Aberration)的補正。In the optical imaging system of the present invention, the curvature radius 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, which is helpful when the two satisfy the relationship of 2.0<R1/R2<3.0. Correction of the Spherical Aberration of the optical photography system.

本發明光學攝影系統中，該第一透鏡的物側表面至成像面於光軸上的距離為TTL，本光學攝影系統另於該成像面設置一電子感光元件，該電子感光元件有效畫素區域對角線長的一半為ImgH，兩者滿足TTL/ImgH<3.8關係式時，有利於維持該光學攝影系統的小型化，以搭載於輕薄可攜式的電子產品上。In the optical imaging system of the present invention, the distance from the object side surface of the first lens to the imaging surface on the optical axis is TTL, and the optical imaging system further provides an electronic photosensitive element on the imaging surface, and the effective photosensitive area of the electronic photosensitive element Half of the diagonal length is ImgH. When the two meet the TTL/ImgH<3.8 relationship, it is advantageous to maintain the miniaturization of the optical imaging system for mounting on thin and portable electronic products.

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，茲舉三較佳可行實施例並配合圖式詳細說明如後。With regard to the techniques, means, and other effects of the present invention in order to achieve the above objects, three preferred embodiments are described in detail with reference to the drawings.

本發明第一實施例所提供的一種光學攝影系統，請參閱第1A、1B圖，該第1A圖為本發明第一實施例之光學攝影系統配置示意圖，第1B圖為本發明第一實施例像差曲線圖，第一實施例從物側到像側包含：For an optical imaging system according to a first embodiment of the present invention, please refer to FIGS. 1A and 1B. FIG. 1A is a schematic diagram showing the configuration of an optical imaging system according to a first embodiment of the present invention, and FIG. 1B is a first embodiment of the present invention. The aberration profile, the first embodiment includes from the object side to the image side:

一具負屈折力的第一透鏡110，其材質為塑膠，該第一透鏡110物側表面111為凸面、該像側表面112為凹面，該第一透鏡110的物側表面111與像側表面112皆設為非球面。A first lens 110 having a negative refractive power is made of plastic. The object side surface 111 of the first lens 110 is a convex surface, and the image side surface 112 is a concave surface. The object side surface 111 and the image side surface of the first lens 110 are formed. 112 are set to aspherical.

一具正屈折力的第二透鏡120，其材質為塑膠，該第二透鏡120物側表面121為凸面、該像側表面122為凸面，該第二透鏡120的物側表面121與像側表面122皆設為非球面。A second lens 120 having a positive refractive power is made of plastic, the object side surface 121 of the second lens 120 is a convex surface, the image side surface 122 is a convex surface, and the object side surface 121 and the image side surface of the second lens 120 are 122 are set to aspherical.

一具正屈折力的第三透鏡130，其材質為塑膠，該第三透鏡130物側表面131為凸面、該像側表面132為凸面，該第三透鏡130的物側表面131與像側表面132皆設為非球面。A third lens 130 having a positive refractive power is made of plastic. The object side surface 131 of the third lens 130 is a convex surface, and the image side surface 132 is a convex surface. The object side surface 131 and the image side surface of the third lens 130 are formed. 132 are all set to aspherical.

一具負屈折力的第四透鏡140，其材質為塑膠，該第四透鏡140物側表面141為凸面、該像側表面142為凹面，該第四透鏡140的物側表面141與像側表面142皆設為非球面，且該第四透鏡140的物側表面141與像側表面142皆設置有反曲點。A fourth lens 140 having a negative refractive power is made of plastic, the object side surface 141 of the fourth lens 140 is a convex surface, the image side surface 142 is a concave surface, and the object side surface 141 and the image side surface of the fourth lens 140 are The 142 is aspherical, and the object side surface 141 and the image side surface 142 of the fourth lens 140 are both provided with an inflection point.

一光圈100，其設於該第二透鏡120與該第三透鏡130之間。An aperture 100 is disposed between the second lens 120 and the third lens 130.

一紅外線濾除濾光片(IR-filter)170，其設於該第四透鏡140像側表面142與一成像面190之間，令該紅外線濾除濾光片170的材質為玻璃且不影響該光學攝影系統的焦距。An infrared filter (IR-filter) 170 is disposed between the image side surface 142 of the fourth lens 140 and an image forming surface 190, so that the material of the infrared filter filter 170 is glass and does not affect The focal length of the optical imaging system.

上述之非球面曲線的方程式表示如下：The equation for the above aspheric curve is expressed as follows:

其中：X：非球面上距離光軸為Y的點，其與相切於非球面光軸上頂點之切面的相對高度；Y：非球面曲線上的點與光軸的距離；k：錐面係數；Ai：第i階非球面係數。Where: X: the point on the aspheric surface from the optical axis Y, the relative height of the tangent to the apex on the aspherical optical axis; Y: the distance between the point on the aspheric curve and the optical axis; k: the tapered surface Coefficient; Ai: the i-th order aspheric coefficient.

第一實施例中，該整體光學攝影系統的焦距為f，其關係式為：f=3.02。In the first embodiment, the focal length of the integral optical imaging system is f, and the relationship is: f = 3.02.

第一實施例中，該整體光學攝影系統的光圈值(f-number)為Fno，其關係式為：Fno=2.05。In the first embodiment, the aperture value (f-number) of the integral optical imaging system is Fno, and the relational expression is Fno=2.05.

第一實施例中，該整體光學攝影系統的最大視角的一半為HFOV，其關係式為：HFOV=37.4。In the first embodiment, half of the maximum viewing angle of the overall optical imaging system is HFOV, and the relationship is: HFOV = 37.4.

第一實施例中，該第三透鏡130的色散係數為V3，該第四透鏡140的色散係數為V4，其關係式為：V3-V4=32.5。In the first embodiment, the third lens 130 has a dispersion coefficient of V3, and the fourth lens 140 has a dispersion coefficient of V4, and the relationship is: V3-V4=32.5.

第一實施例中，該第一透鏡110與第二透鏡間120的鏡間距為T12，該光學攝影系統的整體焦距為f，其關係式為：T12/f=0.19。In the first embodiment, the mirror pitch of the first lens 110 and the second lens 120 is T12, and the overall focal length of the optical imaging system is f, and the relationship is T12/f=0.19.

第一實施例中，該第一透鏡110的中心厚度為CT1，該光學攝影系統的整體焦距為f，其關係式為：CT1/f=0.56。In the first embodiment, the center thickness of the first lens 110 is CT1, and the overall focal length of the optical imaging system is f, and the relationship is: CT1/f=0.56.

第一實施例中，該第一透鏡110的中心厚度為CT1，該第二透鏡120的中心厚度為CT2，其關係式為：CT2/CT1=0.29。In the first embodiment, the center thickness of the first lens 110 is CT1, and the center thickness of the second lens 120 is CT2, and the relationship is: CT2/CT1=0.29.

第一實施例中，該第一透鏡110的物側表面111曲率半徑為R1，該第一透鏡110的像側表面112曲率半徑為R2，其關係式為：R1/R2=2.55。In the first embodiment, the object side surface 111 of the first lens 110 has a radius of curvature R1, and the image side surface 112 of the first lens 110 has a radius of curvature R2, and the relationship is R1/R2=2.55.

第一實施例中，該第二透鏡120的焦距為f2，該第三透鏡130的焦距為f3，其關係式為：f3/f2=0.43。In the first embodiment, the focal length of the second lens 120 is f2, and the focal length of the third lens 130 is f3, and the relationship is f3/f2=0.43.

第一實施例中，該第一透鏡110的焦距為f1，該第四透鏡140的焦距為f4，其關係式為：f4/f1=0.38。In the first embodiment, the focal length of the first lens 110 is f1, and the focal length of the fourth lens 140 is f4, and the relationship is: f4/f1=0.38.

第一實施例中，該第三透鏡130的像側表面132上光線通過之最大範圍位置與光軸150的垂直距離為Y32，該第三透鏡130的像側表面132上距離光軸150為Y32的位置與相切於第三透鏡130光軸150頂點上之切面的距離為SAG32，其關係式為：SAG32/Y32=0.52。其可參閱第1C圖所示。In the first embodiment, the vertical distance between the maximum range of the light passing through the image side surface 132 of the third lens 130 and the optical axis 150 is Y32, and the image side surface 132 of the third lens 130 is Y32 from the optical axis 150. The distance between the position and the tangent plane at the apex of the optical axis 150 of the third lens 130 is SAG32, and the relationship is SAG32/Y32=0.52. It can be seen in Figure 1C.

第一實施例中，該光圈100至成像面190於光軸150上的距離為SL，該第一透鏡110的物側表面111至成像面190於光軸150上的距離為TTL，其關係式為：SL/TTL=0.64。In the first embodiment, the distance from the aperture 100 to the imaging surface 190 on the optical axis 150 is SL, and the distance from the object side surface 111 of the first lens 110 to the imaging surface 190 on the optical axis 150 is TTL, and the relationship is Is: SL / TTL = 0.64.

第一實施例中，該第一透鏡110的物側表面111至成像面190於光軸150上的距離為TTL，本光學攝影系統另設置一電子感光元件(圖上未示)於成像面190，該電子感光元件有效畫素區域對角線長的一半為ImgH，其關係式為：TTL/ImgH=3.21。In the first embodiment, the distance from the object side surface 111 of the first lens 110 to the imaging surface 190 on the optical axis 150 is TTL. The optical imaging system further provides an electronic photosensitive element (not shown) on the imaging surface 190. The half of the diagonal length of the effective pixel area of the electronic photosensitive element is ImgH, and the relationship is: TTL/ImgH=3.21.

第一實施例詳細的結構數據如同表一所示，其非球面數據如同表二所示，其中，曲率半徑、厚度及焦距的單位為公厘(mm)。The detailed structural data of the first embodiment is shown in Table 1. The aspherical data is as shown in Table 2, wherein the unit of curvature radius, thickness and focal length is in mm (mm).

本發明第二實施例所提供的一種光學攝影系統，請參閱第2A、2B圖，該第2A圖為本發明第二實施例之光學攝影系統配置示意圖，第2B圖為本發明第二實施例像差曲線圖，第二實施例從物側到像側包含：For an optical imaging system according to a second embodiment of the present invention, please refer to FIGS. 2A and 2B. FIG. 2A is a schematic diagram showing the configuration of an optical imaging system according to a second embodiment of the present invention, and FIG. 2B is a second embodiment of the present invention. The aberration profile, the second embodiment includes from the object side to the image side:

一具負屈折力的第一透鏡210，其材質為塑膠，該第一透鏡210物側表面211為凸面、該像側表面212為凹面，該第一透鏡210的物側表面211與像側表面212皆設為非球面。A first lens 210 having a negative refractive power is made of plastic, the object side surface 211 of the first lens 210 is a convex surface, the image side surface 212 is a concave surface, and the object side surface 211 and the image side surface of the first lens 210 are 212 is set to aspherical.

一具正屈折力的第二透鏡220，其材質為塑膠，該第二透鏡220物側表面221為凹面、該像側表面222為凸面，該第二透鏡220的物側表面221與像側表面222皆設為非球面。A second lens 220 having a positive refractive power is made of plastic, the object side surface 221 of the second lens 220 is a concave surface, the image side surface 222 is a convex surface, and the object side surface 221 and the image side surface of the second lens 220 are 222 are all set to aspherical.

一具正屈折力的第三透鏡230，其材質為塑膠，該第三透鏡230物側表面231為凸面、該像側表面232為凸面，該第三透鏡230的物側表面231與像側表面232皆設為非球面。A third lens 230 having a positive refractive power is made of plastic. The object side surface 231 of the third lens 230 is a convex surface, the image side surface 232 is a convex surface, and the object side surface 231 and the image side surface of the third lens 230 are formed. 232 are all set to aspherical.

一具負屈折力的第四透鏡240，其材質為塑膠，該第四透鏡240物側表面241為凹面、該像側表面242為凹面，該第四透鏡240的物側表面241與像側表面242皆設為非球面，且該第四透鏡240的物側表面241與像側表面242皆設置有反曲點。A fourth lens 240 having a negative refractive power is made of plastic, the object side surface 241 of the fourth lens 240 is a concave surface, the image side surface 242 is a concave surface, and the object side surface 241 and the image side surface of the fourth lens 240 are Each of the 242 is aspherical, and the object side surface 241 and the image side surface 242 of the fourth lens 240 are both provided with an inflection point.

一光圈200，其設於該第一透鏡210與該第二透鏡220之間。An aperture 200 is disposed between the first lens 210 and the second lens 220.

一紅外線濾除濾光片(IR-filter)270，其設於該第四透鏡240像側表面242與一成像面290之間，令該紅外線濾除濾光片270的材質為玻璃且不影響該光學攝影系統的焦距。An infrared filter (IR-filter) 270 is disposed between the image side surface 242 of the fourth lens 240 and an image forming surface 290, so that the material of the infrared filter filter 270 is glass and does not affect The focal length of the optical imaging system.

第二實施例非球面曲線方程式的表示如同第一實施例的形式。The second embodiment shows the aspheric curve equation as in the form of the first embodiment.

第二實施例中，該整體光學攝影系統的焦距為f，其關係式為：f=3.11。In the second embodiment, the focal length of the integral optical imaging system is f, and the relationship is: f = 3.11.

第二實施例中，該整體光學攝影系統的光圈值(f-number)為Fno，其關係式為：Fno=2.40。In the second embodiment, the aperture value (f-number) of the integral optical imaging system is Fno, and the relational expression is Fno=2.40.

第二實施例中，該整體光學攝影系統的最大視角的一半為HFOV，其關係式為：HFOV=36.5。In the second embodiment, half of the maximum viewing angle of the overall optical imaging system is HFOV, and the relationship is: HFOV = 36.5.

第二實施例中，該第三透鏡230的色散係數為V3，該第四透鏡240的色散係數為V4，其關係式為：V3-V4=32.5。In the second embodiment, the third lens 230 has a dispersion coefficient of V3, and the fourth lens 240 has a dispersion coefficient of V4, and the relationship is: V3-V4=32.5.

第二實施例中，該第一透鏡210與第二透鏡間220的鏡間距為T12，該光學攝影系統的整體焦距為f，其關係式為：T12/f=0.15。In the second embodiment, the mirror pitch of the first lens 210 and the second lens 220 is T12, and the overall focal length of the optical imaging system is f, and the relationship is T12/f=0.15.

第二實施例中，該第一透鏡210的中心厚度為CT1，該光學攝影系統的整體焦距為f，其關係式為：CT1/f=0.58。In the second embodiment, the center thickness of the first lens 210 is CT1, and the overall focal length of the optical imaging system is f, and the relationship is: CT1/f=0.58.

第二實施例中，該第一透鏡210的中心厚度為CT1，該第二透鏡220的中心厚度為CT2，其關係式為：CT2/CT1=0.34。In the second embodiment, the center thickness of the first lens 210 is CT1, and the center thickness of the second lens 220 is CT2, and the relationship is: CT2/CT1=0.34.

第二實施例中，該第一透鏡210的物側表面211曲率半徑為R1，該第一透鏡210的像側表面212曲率半徑為R2，其關係式為：R1/R2=2.69。In the second embodiment, the object side surface 211 of the first lens 210 has a radius of curvature R1, and the image side surface 212 of the first lens 210 has a radius of curvature R2, and the relationship is: R1/R2=2.69.

第二實施例中，該第二透鏡220的焦距為f2，該第三透鏡230的焦距為f3，其關係式為：f3/f2=0.57。In the second embodiment, the focal length of the second lens 220 is f2, and the focal length of the third lens 230 is f3, and the relationship is f3/f2=0.57.

第二實施例中，該第一透鏡210的焦距為f1，該第四透鏡240的焦距為f4，其關係式為：f4/f1=0.33。In the second embodiment, the focal length of the first lens 210 is f1, and the focal length of the fourth lens 240 is f4, and the relationship is f4/f1=0.33.

第二實施例中，該第三透鏡230的像側表面232上光線通過之最大範圍位置與光軸250的垂直距離為Y32，該第三透鏡230的像側表面232上距離光軸250為Y32的位置與相切於第三透鏡230光軸250頂點上之切面的距離為SAG32，其關係式為：SAG32/Y32=0.49。需說明的是，由於該SAG32與Y32的示意圖類似於第一實施例(即第1C圖)，故在此不再繪製。In the second embodiment, the vertical distance between the maximum range of the light passing through the image side surface 232 of the third lens 230 and the optical axis 250 is Y32, and the image side surface 232 of the third lens 230 is Y32 from the optical axis 250. The distance between the position and the tangent plane at the apex of the optical axis 250 of the third lens 230 is SAG32, and the relationship is SAG32/Y32=0.49. It should be noted that since the schematic diagrams of the SAG32 and Y32 are similar to the first embodiment (ie, FIG. 1C), they are not drawn here.

第二實施例中，該光圈200至成像面290於光軸250上的距離為SL，該第一透鏡210的物側表面211至成像面290於光軸250上的距離為TTL，其關係式為：SL/TTL=0.71。In the second embodiment, the distance from the aperture 200 to the imaging surface 290 on the optical axis 250 is SL, and the distance from the object side surface 211 of the first lens 210 to the imaging surface 290 on the optical axis 250 is TTL, and the relationship is Is: SL / TTL = 0.71.

第二實施例中，該第一透鏡210的物側表面211至成像面290於光軸250上的距離為TTL，本光學攝影系統另設置一電子感光元件(圖上未示)於成像面290，該電子感光元件有效畫素區域對角線長的一半為ImgH，其關係式為：TTL/ImgH=3.29。In the second embodiment, the distance from the object side surface 211 of the first lens 210 to the imaging surface 290 on the optical axis 250 is TTL. The optical imaging system further provides an electronic photosensitive element (not shown) on the imaging surface 290. The half of the diagonal length of the effective pixel area of the electronic photosensitive element is ImgH, and the relationship is: TTL/ImgH=3.29.

第二實施例詳細的結構數據如同表三所示，其非球面數據如同表四所示，其中，曲率半徑、厚度及焦距的單位為公厘(mm)。The detailed structural data of the second embodiment is shown in Table 3. The aspherical data is as shown in Table 4, wherein the unit of curvature radius, thickness and focal length is mm (mm).

本發明第三實施例所提供的一種光學攝影系統，請參閱第3A、3B圖，該第3A圖為本發明第三實施例之光學攝影系統配置示意圖，第3B圖為本發明第三實施例像差曲線圖，第三實施例從物側到像側包含：For an optical imaging system according to a third embodiment of the present invention, please refer to FIGS. 3A and 3B. FIG. 3A is a schematic diagram showing the configuration of an optical imaging system according to a third embodiment of the present invention, and FIG. 3B is a third embodiment of the present invention. The aberration profile, the third embodiment includes from the object side to the image side:

一具負屈折力的第一透鏡310，其材質為塑膠，該第一透鏡310物側表面311為凸面、該像側表面312為凹面，該第一透鏡310的物側表面311與像側表面312皆設為非球面。A first lens 310 having a negative refractive power is made of plastic. The object side surface 311 of the first lens 310 is a convex surface, and the image side surface 312 is a concave surface. The object side surface 311 and the image side surface of the first lens 310 are formed. 312 are all set to aspherical.

一具正屈折力的第二透鏡320，其材質為塑膠，該第二透鏡320物側表面321為凹面、該像側表面322為凸面，該第二透鏡320的物側表面321與像側表面322皆設為非球面。A second lens 320 having a positive refractive power is made of plastic. The object side surface 321 of the second lens 320 is a concave surface, the image side surface 322 is a convex surface, and the object side surface 321 and the image side surface of the second lens 320 are formed. 322 are all set to aspherical.

一具正屈折力的第三透鏡330，其材質為塑膠，該第三透鏡330物側表面331為凸面、該像側表面332為凸面，該第三透鏡330的物側表面331與像側表面332皆設為非球面。A third lens 330 having a positive refractive power is made of plastic. The object side surface 331 of the third lens 330 is a convex surface, the image side surface 332 is a convex surface, and the object side surface 331 and the image side surface of the third lens 330 are formed. 332 are all set to aspherical.

一具負屈折力的第四透鏡340，其材質為塑膠，該第四透鏡340物側表面341為凸面、該像側表面342為凹面，該第四透鏡340的物側表面341與像側表面342皆設為非球面，且該第四透鏡340的物側表面341與像側表面342皆設置有反曲點。A fourth lens 340 having a negative refractive power is made of plastic, the object side surface 341 of the fourth lens 340 is a convex surface, the image side surface 342 is a concave surface, and the object side surface 341 and the image side surface of the fourth lens 340 are Each of the 342 is aspherical, and the object side surface 341 and the image side surface 342 of the fourth lens 340 are both provided with an inflection point.

一光圈300，其設於該第二透鏡320與該第三透鏡330之間。An aperture 300 is disposed between the second lens 320 and the third lens 330.

一紅外線濾除濾光片(IR-filter)370，其設於該第四透鏡340像側表面342與一成像面390之間，令該紅外線濾除濾光片370的材質為玻璃且不影響該光學攝影系統的焦距。An infrared filter (IR-filter) 370 is disposed between the image side surface 342 of the fourth lens 340 and an image forming surface 390, so that the material of the infrared filter filter 370 is glass and does not affect The focal length of the optical imaging system.

第三實施例非球面曲線方程式的表示如同第一實施例的形式。The third embodiment shows the aspheric curve equation as in the form of the first embodiment.

第三實施例中，該整體光學攝影系統的焦距為f，其關係式為：f=3.09。In the third embodiment, the focal length of the integral optical imaging system is f, and the relationship is: f = 3.09.

第三實施例中，該整體光學攝影系統的光圈值(f-number)為Fno，其關係式為：Fno=2.10。In the third embodiment, the aperture value (f-number) of the integral optical imaging system is Fno, and the relational expression is Fno=2.10.

第三實施例中，該整體光學攝影系統的最大視角的一半為HFOV，其關係式為：HFOV=36.5。In the third embodiment, half of the maximum viewing angle of the overall optical imaging system is HFOV, and the relationship is: HFOV = 36.5.

第三實施例中，該第三透鏡330的色散係數為V3，該第四透鏡340的色散係數為V4，其關係式為：V3-V4=32.5。In the third embodiment, the third lens 330 has a dispersion coefficient of V3, and the fourth lens 340 has a dispersion coefficient of V4, and the relationship is V3-V4=32.5.

第三實施例中，該第一透鏡310與第二透鏡間320的鏡間距為T12，該光學攝影系統的整體焦距為f，其關係式為：T12/f=0.16。In the third embodiment, the mirror pitch of the first lens 310 and the second lens 320 is T12, and the overall focal length of the optical imaging system is f, and the relationship is: T12/f=0.16.

第三實施例中，該第一透鏡310的中心厚度為CT1，該光學攝影系統的整體焦距為f，其關係式為：CT1/f=0.65。In the third embodiment, the center thickness of the first lens 310 is CT1, and the overall focal length of the optical imaging system is f, and the relationship is: CT1/f=0.65.

第三實施例中，該第一透鏡310的中心厚度為CT1，該第二透鏡320的中心厚度為CT2，其關係式為：CT2/CT1=0.24。In the third embodiment, the center thickness of the first lens 310 is CT1, and the center thickness of the second lens 320 is CT2, and the relationship is: CT2/CT1=0.24.

第三實施例中，該第一透鏡310的物側表面311曲率半徑為R1，該第一透鏡310的像側表面312曲率半徑為R2，其關係式為：R1/R2=2.63。In the third embodiment, the object side surface 311 of the first lens 310 has a radius of curvature R1, and the image side surface 312 of the first lens 310 has a radius of curvature R2, and the relationship is: R1/R2=2.63.

第三實施例中，該第二透鏡320的焦距為f2，該第三透鏡330的焦距為f3，其關係式為：f3/f2=0.36。In the third embodiment, the focal length of the second lens 320 is f2, and the focal length of the third lens 330 is f3, and the relationship is f3/f2=0.36.

第三實施例中，該第一透鏡310的焦距為f1，該第四透鏡340的焦距為f4，其關係式為：f4/f1=0.30。In the third embodiment, the focal length of the first lens 310 is f1, and the focal length of the fourth lens 340 is f4, and the relationship is f4/f1=0.30.

第三實施例中，該第三透鏡330的像側表面332上光線通過之最大範圍位置與光軸350的垂直距離為Y32，該第三透鏡330的像側表面332上距離光軸350為Y32的位置與相切於第三透鏡330光軸350頂點上之切面的距離為SAG32，其關係式為：SAG32/Y32=0.48。需說明的是，由於該SAG32與Y32的示意圖類似於第一實施例(即第1C圖)，故在此不再繪製。In the third embodiment, the vertical distance between the maximum range of the light passing through the image side surface 332 of the third lens 330 and the optical axis 350 is Y32, and the image side surface 332 of the third lens 330 is Y32 from the optical axis 350. The distance between the position and the tangent plane on the apex of the optical axis 350 of the third lens 330 is SAG32, and the relationship is SAG32/Y32=0.48. It should be noted that since the schematic diagrams of the SAG32 and Y32 are similar to the first embodiment (ie, FIG. 1C), they are not drawn here.

第三實施例中，該光圈300至成像面390於光軸350上的距離為SL，該第一透鏡310的物側表面311至成像面390於光軸350上的距離為TTL，其關係式為：SL/TTL=0.63。In the third embodiment, the distance from the aperture 300 to the imaging surface 390 on the optical axis 350 is SL, and the distance from the object side surface 311 of the first lens 310 to the imaging surface 390 on the optical axis 350 is TTL, and the relationship is Is: SL / TTL = 0.63.

第三實施例中，該第一透鏡310的物側表面311至成像面390於光軸350上的距離為TTL，本光學攝影系統另設置一電子感光元件(圖上未示)於成像面390，該電子感光元件有效畫素區域對角線長的一半為ImgH，其關係式為：TTL/ImgH=3.39。In the third embodiment, the distance from the object side surface 311 of the first lens 310 to the imaging surface 390 on the optical axis 350 is TTL. The optical imaging system further provides an electronic photosensitive element (not shown) on the imaging surface 390. The half of the diagonal length of the effective pixel area of the electronic photosensitive element is ImgH, and the relationship is: TTL/ImgH=3.39.

第三實施例詳細的結構數據如同表五所示，其非球面數據如同表六所示，其中，曲率半徑、厚度及焦距的單位為公厘(mm)。The detailed structural data of the third embodiment is as shown in Table 5. The aspherical data is as shown in Table 6, wherein the unit of curvature radius, thickness and focal length is in mm (mm).

值得說明的是，表一至表六所示為本發明的光學攝影系統各實施例的不同數值變化表，然本發明各實施例的數值變化皆屬實驗所得，即使使用不同數值，相同結構的產品仍屬於本發明的保護範疇。表七為各實施例中各關係式的對應表。It should be noted that Tables 1 to 6 show different numerical value change tables of the embodiments of the optical imaging system of the present invention, but the numerical changes of the embodiments of the present invention are experimentally obtained, even if different values are used, products of the same structure are used. Still belongs to the protection scope of the present invention. Table 7 is a correspondence table of the respective relations in each embodiment.

110、210、310．．．第一透鏡110, 210, 310. . . First lens

111、211、311．．．物側表面111, 211, 311. . . Side surface

112、212、312．．．像側表面112, 212, 312. . . Image side surface

120、220、320．．．第二透鏡120, 220, 320. . . Second lens

121、221、321．．．物側表面121, 221, 321. . . Side surface

122、222、322．．．像側表面122, 222, 322. . . Image side surface

130、230、330．．．第三透鏡130, 230, 330. . . Third lens

131、231、331．．．物側表面131, 231, 331. . . Side surface

132、232、332．．．像側表面132, 232, 332. . . Image side surface

140、240、340．．．第四透鏡140, 240, 340. . . Fourth lens

141、241、341．．．物側表面141, 241, 341. . . Side surface

142、242、342．．．像側表面142, 242, 342. . . Image side surface

100、200、300．．．光圈100, 200, 300. . . aperture

150、250、350．．．光軸150, 250, 350. . . Optical axis

170、270、370．．．紅外線濾除濾光片(IR Filter)170, 270, 370. . . Infrared filter (IR Filter)

190、290、390．．．成像面190, 290, 390. . . Imaging surface

CT1．．．第一透鏡的中心厚度CT1. . . Center thickness of the first lens

CT2．．．第二透鏡的中心厚度CT2. . . Center thickness of the second lens

f．．．光學攝影系統的整體焦距f. . . Overall focal length of optical photography system

f1．．．第一透鏡的焦距F1. . . Focal length of the first lens

f2．．．第二透鏡的焦距F2. . . Focal length of the second lens

f3．．．第三透鏡的焦距F3. . . Focal length of the third lens

f4．．．第四透鏡的焦距F4. . . Focal length of the fourth lens

ImgH．．．電子感光元件有效畫素區域對角線長的一半ImgH. . . The electronic photosensitive element is half the length of the diagonal of the effective pixel area

R1．．．第一透鏡的物側表面曲率半徑R1. . . The radius of curvature of the object side surface of the first lens

R2．．．第一透鏡的像側表面曲率半徑R2. . . Image side surface curvature radius of the first lens

Y32．．．第三透鏡的像側表面上光線通過之最大範圍位置與光軸的垂直距離Y32. . . The vertical range of the maximum range position of the light passing through the image side surface of the third lens and the optical axis

SAG32．．．第三透鏡的像側表面上距離光軸為Y32的位置與相切於第三透鏡光軸頂點上之切面的距離SAG32. . . a distance from a position on the image side surface of the third lens that is Y32 from the optical axis to a tangent on the apex of the optical axis of the third lens

SL．．．光圈至成像面於光軸上的距離SL. . . Aperture to the distance of the imaging surface on the optical axis

T12．．．第一透鏡與第二透鏡間的鏡間距T12. . . Mirror spacing between the first lens and the second lens

TTL．．．第一透鏡的物側表面至成像面於光軸上的距離TTL. . . The distance from the object side surface of the first lens to the imaging plane on the optical axis

V3．．．第三透鏡的色散係數V3. . . Dispersion coefficient of the third lens

V4．．．第四透鏡的色散係數V4. . . Dispersion coefficient of the fourth lens

第1A圖　係本發明第一實施例之光學示意圖。Fig. 1A is an optical schematic view of a first embodiment of the present invention.

第1B圖　係本發明第一實施例像差曲線圖。Fig. 1B is a diagram showing aberrations of the first embodiment of the present invention.

第1C圖　係本發明第一實施例之SAG32與Y32的示意圖。Fig. 1C is a schematic view of SAG32 and Y32 of the first embodiment of the present invention.

第2A圖　係本發明第二實施例之光學示意圖。Fig. 2A is an optical schematic view of a second embodiment of the present invention.

第2B圖　係本發明第二實施例像差曲線圖。Fig. 2B is a diagram showing aberrations of the second embodiment of the present invention.

第3A圖　係本發明第三實施例之光學示意圖。Fig. 3A is an optical schematic view of a third embodiment of the present invention.

第3B圖　係本發明第三實施例像差曲線圖。Fig. 3B is a diagram showing aberrations of the third embodiment of the present invention.

【表簡單說明】[Table description]

表一　第一實施例光學數據。Table 1 Optical data of the first embodiment.

表二　第一實施例非球面數據。Table 2 The first embodiment aspherical data.

表三　第二實施例光學數據。Table 3 Second embodiment optical data.

表四　第二實施例非球面數據。Table 4 The second embodiment aspherical data.

表五　第三實施例光學數據。Table 5 Optical data of the third embodiment.

表六　第三實施例非球面數據。Table 6 The third embodiment is aspherical data.

表七　本發明相關關係式的數值資料。Table 7 Numerical data of the correlation equation of the present invention.

110．．．第一透鏡110. . . First lens

111．．．物側表面111. . . Side surface

112．．．像側表面112. . . Image side surface

120．．．第二透鏡120. . . Second lens

121．．．物側表面121. . . Side surface

122．．．像側表面122. . . Image side surface

130．．．第三透鏡130. . . Third lens

131．．．物側表面131. . . Side surface

132．．．像側表面132. . . Image side surface

140．．．第四透鏡140. . . Fourth lens

141．．．物側表面141. . . Side surface

142．．．像側表面142. . . Image side surface

100．．．光圈100. . . aperture

150．．．光軸150. . . Optical axis

170．．．紅外線濾除濾光片(IR Filter)170. . . Infrared filter (IR Filter)

190．．．成像面190. . . Imaging surface