WO2022041054A1

WO2022041054A1 - Optical system, camera module, and electronic device

Info

Publication number: WO2022041054A1
Application number: PCT/CN2020/111764
Authority: WO
Inventors: 杨懿; 党绪文; 谭怡翔; 刘秀; 李明
Original assignee: 欧菲光集团股份有限公司; 南昌欧菲精密光学制品有限公司
Priority date: 2020-08-27
Filing date: 2020-08-27
Publication date: 2022-03-03

Abstract

An optical system, a camera module, and an electronic device. The optical system sequentially comprises from the object side to the image side: a first lens (L1) having positive refractive power, the object side surface (S1) thereof being convex near the optical axis; a second lens (L2) having refractive power; a third lens (L3) having refractive power, the image side surface (S6) thereof being concave near the optical axis; a fourth lens (L4) having negative refractive power, the object side (S7) thereof being convex near the optical axis, and the image side (S8) thereof being concave near the optical axis; a fifth lens (L5) having refractive power, the object side surface (S9) thereof being concave near the optical axis; a sixth lens (L6) having refractive power, the image side surface (S12) thereof being convex near the optical axis; and a seventh lens (L7) having negative refractive power, the image side surface (S14) thereof being concave near the optical axis, both the object side surface (S13) and image side surface (S14) thereof being aspherical, and at least one of the object side surface (S13) and image side surface (S14) being provided with at least one inflection point. By properly configuring the refractive power and surface shape of the first lens (L1) to the seventh lens (L7) and providing the inflection point, the optical system can guarantee both the effective focal length (f) and the overall system length to achieve a sufficiently long effective focal length (f) and short overall system length.

Description

光学***、摄像模组和电子设备Optical systems, camera modules and electronic equipment

技术领域technical field

本申请属于光学成像领域，尤其涉及一种光学***、摄像模组和电子设备。The present application belongs to the field of optical imaging, and in particular relates to an optical system, a camera module and an electronic device.

背景技术Background technique

随着手机、相机等各种拍照设备的制造技术不断发展，为了满足广大用户的拍照需求，其摄像头也在同步快速发展着。如最近几年出现了通过同时搭载多个具有不同功能的摄像头以适应多种场景的拍摄要求，譬如同时搭载广角摄像头和长焦摄像头。With the continuous development of the manufacturing technology of various photographic devices such as mobile phones and cameras, in order to meet the photographic needs of the majority of users, their cameras are also developing rapidly. For example, in recent years, multiple cameras with different functions have been installed at the same time to meet the shooting requirements of various scenes, such as a wide-angle camera and a telephoto camera at the same time.

目前的拍照设备具有小型化的发展趋势，使得其上的长焦摄像头难以兼顾有效焦距和***总长，要不就是有效焦距过短，难以进行长焦拍摄，要不就是***总长过长，不能适配手机等小型拍照设备。The current photographic equipment has a trend of miniaturization, which makes it difficult for the telephoto camera on it to take into account the effective focal length and the total length of the system. Either the effective focal length is too short, and it is difficult to perform telephoto shooting, or the total length of the system is too long. Equipped with small camera equipment such as mobile phones.

发明内容SUMMARY OF THE INVENTION

本申请的目的是提供一种光学***、摄像模组和电子设备，能够兼顾有效焦距和***总长，从而具有足够长的有效焦距以及较短的***总长，能够同时满足小型化和长焦摄像要求。The purpose of the present application is to provide an optical system, a camera module and an electronic device, which can take into account the effective focal length and the total system length, so as to have a sufficiently long effective focal length and a short total system length, and can meet the requirements of miniaturization and telephoto photography at the same time .

为实现本申请的目的，本申请提供了如下的技术方案：To achieve the purpose of the application, the application provides the following technical solutions:

第一方面，本申请提供了一种光学***，光学***从物侧至像侧依次包括：第一透镜，具有正曲折力，所述第一透镜的物侧面于近光轴处为凸面；第二透镜，具有曲折力；第三透镜，具有曲折力，所述第三透镜的像侧面于近光轴处为凹面；第四透镜，具有负曲折力，所述第四透镜的物侧面于近光轴处为凸面，所述第四透镜的像侧面于近光轴处为凹面；第五透镜，具有曲折力，所述第五透镜的物侧面于近光轴处为凹面；第六透镜，具有曲折力，所述第六透镜的像侧面于近光轴处为凸面；第七透镜，具有负曲折力，所述第七透镜的像侧面于近光轴处为凹面，所述第七透镜的物侧面与像侧面均为非球面，且所述第七透镜的物侧面与像侧面中的至少一者设置有至少一个反曲点。In a first aspect, the present application provides an optical system, the optical system includes in order from the object side to the image side: a first lens having a positive bending force, and the object side of the first lens is a convex surface at the near optical axis; The second lens has bending power; the third lens has bending power, and the image side of the third lens is concave at the near optical axis; the fourth lens has negative bending power, and the object side of the fourth lens is near the optical axis. The optical axis is convex, and the image side of the fourth lens is concave at the near optical axis; the fifth lens has a bending force, and the object side of the fifth lens is concave at the near optical axis; the sixth lens, It has a bending force, and the image side of the sixth lens is convex at the near optical axis; the seventh lens has a negative bending force, and the image side of the seventh lens is concave at the near optical axis, and the seventh lens has a concave surface. Both the object side surface and the image side surface of the seventh lens are aspherical, and at least one of the object side surface and the image side surface of the seventh lens is provided with at least one inflection point.

通过合理配置第一透镜至第七透镜的曲折力以及面型，且在第七透镜上设置反曲点，光学***能够兼顾有效焦距和***总长，从而具有足够长的有效焦距以及较短的***总长，能够同时满足小型化和长焦摄像的要求。By reasonably configuring the inflection force and surface shape of the first lens to the seventh lens, and setting the inflection point on the seventh lens, the optical system can take into account the effective focal length and the total length of the system, so as to have a sufficiently long effective focal length and a short system. The overall length can meet the requirements of miniaturization and telephoto photography at the same time.

一种实施方式中，所述光学***满足条件式：f/TTL>1；其中，f为所述光学***的有效焦距，TTL为所述第一透镜的物侧面至所述光学***的成像面于光轴上的距离。通过满足f/TTL的取值高于1，光学***的有效焦距较长，从而具有长焦特性。In an embodiment, the optical system satisfies the conditional formula: f/TTL>1; where f is the effective focal length of the optical system, and TTL is the object side of the first lens to the imaging plane of the optical system distance on the optical axis. By satisfying the value of f/TTL higher than 1, the effective focal length of the optical system is longer, thus having a telephoto characteristic.

一种实施方式中，所述光学***满足条件式：0mm ^-1＜FNO/(ImgH*2)＜5mm ^-1；其中，FNO为所述光学***的光圈数，Imgh为所述光学***成像面上有效感光区域对角线长度的一半。可以理解的是，Imgh决定了电子感光芯片的大小，Imgh越大，光学***可支持的最大电子感光芯片的尺寸便越大。通过满足FNO/(ImgH*2)的取值在0mm ^-1和5mm ^-1之间，可让光学***支持高像素电子感光芯片；同时，提供了较大的光圈数，可获得更高的进光量，光学***在长焦拍摄下可更容易突出被摄主体，虚化背景。 In an embodiment, the optical system satisfies the conditional formula: 0mm ^-1 <FNO/(ImgH*2)<5mm ^-1 ; wherein, FNO is the aperture number of the optical system, and Imgh is the imaging surface of the optical system Half of the diagonal length of the upper effective photosensitive area. It is understandable that Imgh determines the size of the electronic photosensitive chip, and the larger the Imgh, the larger the size of the largest electronic photosensitive chip that the optical system can support. By satisfying the value of FNO/(ImgH*2) between 0mm ^-1 and 5mm ^-1 , the optical system can support high-pixel electronic photosensitive chips; at the same time, it provides a larger aperture number, which can achieve higher The amount of light, the optical system can more easily highlight the subject and blur the background under telephoto shooting.

一种实施方式中，所述光学***满足条件式：Y11/Y72<0.6；其中，Y11为所述第一透镜物侧面的有效半口径，Y72为所述第七透镜像侧面的有效半口径。通过满足Y11/Y72的取值低于0.6，第一透镜物侧面的有效口径较小，光学***具有小头部尺寸的特点，有利于实现小型化设计。In an embodiment, the optical system satisfies the conditional formula: Y11/Y72<0.6; wherein, Y11 is the effective semi-aperture of the object side of the first lens, and Y72 is the effective semi-aperture of the image side of the seventh lens. By satisfying that the value of Y11/Y72 is lower than 0.6, the effective aperture of the object side of the first lens is small, and the optical system has the characteristics of small head size, which is conducive to realizing miniaturized design.

一种实施方式中，所述光学***满足条件式：1＜BF/CT67＜3；其中，BF为所述第七透镜像侧面至成像面的最短距离，CT67为所述第六透镜的像侧面和所述第七透镜的物侧面于光轴上的间距。通过满足BF/CT67的取值在1和3之间，可确保与电子感光芯片具有良好的匹配性，同时第六透镜和第七透镜具有合理的间距，有助于减少像差和提升解像力。In one embodiment, the optical system satisfies the conditional formula: 1<BF/CT67<3; wherein, BF is the shortest distance from the image side surface of the seventh lens to the imaging surface, and CT67 is the image side surface of the sixth lens and the distance between the object side of the seventh lens and the optical axis. By satisfying the value of BF/CT67 between 1 and 3, it can ensure good matching with the electronic photosensitive chip, and at the same time, the sixth lens and the seventh lens have a reasonable distance, which helps to reduce aberration and improve resolution.

一种实施方式中，所述光学***满足条件式：6<(Y72*TTL)/(ET7*f)<13；其中，Y72为所述第七透镜像侧面的有效半口径，TTL为所述第一透镜的物侧面至所述光学***的成像面于光轴上的距离，ET7为所述第七透镜的光学有效区域边缘的厚度，f为所述光学***的有效焦距。通过满足(Y72*TTL)/(ET7*f)的取值在6和13之间，可平衡光学***长焦特性与***总长，在保证第七透镜成型良率同时减小光学***的最大直径。In one embodiment, the optical system satisfies the conditional formula: 6<(Y72*TTL)/(ET7*f)<13; wherein, Y72 is the effective half-aperture of the image side of the seventh lens, and TTL is the The distance from the object side of the first lens to the imaging surface of the optical system on the optical axis, ET7 is the thickness of the edge of the optical effective area of the seventh lens, and f is the effective focal length of the optical system. By satisfying the value of (Y72*TTL)/(ET7*f) between 6 and 13, the telephoto characteristic of the optical system and the total length of the system can be balanced, and the maximum diameter of the optical system can be reduced while ensuring the molding yield of the seventh lens .

一种实施方式中，所述光学***满足条件式：0<f123/R32＜10；其中，f123为所述第一透镜、所述第二透镜和所述第三透镜的组合有效焦距，R32为所述第三透镜像侧面于光轴处的曲率半径。通过满足f123/R32的取值在0和10之间，第三透镜曲率的变化，迅速压缩了光线在光学***中的口径，利于后面透镜对光线的进一步控制；同时提供了较大的第一透镜至第三透镜的组合有效焦距，为光学***有效焦距的提升提供一定帮助。In an embodiment, the optical system satisfies the conditional formula: 0<f123/R32<10; wherein, f123 is the combined effective focal length of the first lens, the second lens and the third lens, and R32 is The curvature radius of the image side surface of the third lens at the optical axis. By satisfying the value of f123/R32 between 0 and 10, the change of the curvature of the third lens quickly compresses the aperture of the light in the optical system, which is conducive to the further control of the light by the rear lens; at the same time, it provides a larger first The combined effective focal length of the lens to the third lens provides certain help for the improvement of the effective focal length of the optical system.

一种实施方式中，所述光学***满足条件式：2.5<TTL/∑AT<4；其中，TTL为所述第一透镜的物侧面至所述光学***的成像面于光轴上的距离，∑AT为所述第一透镜至所述第七透镜中相邻的任意两个透镜于光轴上的空气间隔的总和。通过满足TTL/∑AT的取值在2.5和4之间，有利于在可加工范围内减小相邻镜片于光轴的间距，进而减小***总长，实现光学***的超薄特性。可以理解的是，当TTL/∑AT>4时，相邻透镜于光轴的间距过小，增加公差敏感度，不利于镜片组装，增加加工难度。当TTL/∑AT＜2.5时，***总长过短，不利于实现长焦特性。In one embodiment, the optical system satisfies the conditional formula: 2.5<TTL/∑AT<4; wherein, TTL is the distance from the object side of the first lens to the imaging plane of the optical system on the optical axis, ΣAT is the sum of the air intervals on the optical axis of any two adjacent lenses from the first lens to the seventh lens. By satisfying the value of TTL/∑AT between 2.5 and 4, it is beneficial to reduce the distance between adjacent lenses and the optical axis within the processable range, thereby reducing the total length of the system and realizing the ultra-thin characteristics of the optical system. It can be understood that when TTL/∑AT>4, the distance between adjacent lenses and the optical axis is too small, which increases tolerance sensitivity, is not conducive to lens assembly, and increases processing difficulty. When TTL/∑AT<2.5, the total length of the system is too short, which is not conducive to realizing the telephoto characteristic.

一种实施方式中，所述光学***满足条件式：TTL/EPD<3；其中，TTL 为所述第一透镜的物侧面至所述光学***的成像面于光轴上的距离，EPD为所述光学***的入瞳直径。通过满足TTL/EPD的取值低于3，可使***总长较小，并增加进光量。In one embodiment, the optical system satisfies the conditional formula: TTL/EPD<3; wherein, TTL is the distance on the optical axis from the object side of the first lens to the imaging plane of the optical system, and EPD is the The entrance pupil diameter of the optical system. By satisfying the value of TTL/EPD below 3, the total length of the system can be reduced and the amount of incoming light can be increased.

一种实施方式中，所述光学***满足条件式：0.5<|f4567/f|<2；其中，f4567为所述第四透镜、所述第五透镜、所述第六透镜和所述第七透镜的组合有效焦距，f为所述光学***的有效焦距。通过满足|f4567/f|的取值在0.5和2之间，有利于校正光学***的色差和场曲，以及减缓光线偏折角度，降低敏感度，降低镜头成型难度。可以理解的是，当|f4567/f|<0.5时，第四透镜至第七透镜一同贡献给整个***的组合有效焦距过小，引起光线偏折过大，也不利于像差校正，最后导致成像质量降低。当|f4567/f|＞2时，第四透镜至第七透镜的总长占***总长的比重过高，不利于***小型化；而且第四透镜至第七透镜的整体曲折力不足，难以有效平衡第一透镜和第二透镜整体的像差。In an embodiment, the optical system satisfies the conditional formula: 0.5<|f4567/f|<2; where f4567 is the fourth lens, the fifth lens, the sixth lens and the seventh lens The combined effective focal length of the lens, f is the effective focal length of the optical system. By satisfying the value of |f4567/f| between 0.5 and 2, it is beneficial to correct the chromatic aberration and field curvature of the optical system, as well as to slow down the light deflection angle, reduce the sensitivity, and reduce the difficulty of lens shaping. It can be understood that when |f4567/f|<0.5, the combined effective focal length of the fourth lens to the seventh lens together to contribute to the entire system is too small, causing excessive light deflection, which is not conducive to aberration correction, and finally leads to Image quality is reduced. When |f4567/f|>2, the proportion of the total length of the fourth lens to the seventh lens in the total length of the system is too high, which is not conducive to the miniaturization of the system; and the overall bending force of the fourth lens to the seventh lens is insufficient, making it difficult to effectively balance The aberration of the first lens and the second lens as a whole.

一种实施方式中，所述光学***满足条件式：Y11/f<0.3；其中，Y11为所述第一透镜物侧面的有效半口径，f为所述光学***的有效焦距。通过满足Y11/f的取值低于0.3，在光学***的有效焦距一定的情况下，能保证第一透镜的口径尽可能小，从而满足小头部要求，有利于实现小型化。In one embodiment, the optical system satisfies the conditional formula: Y11/f<0.3; wherein, Y11 is the effective semi-aperture of the object side of the first lens, and f is the effective focal length of the optical system. By satisfying that the value of Y11/f is lower than 0.3, under the condition that the effective focal length of the optical system is constant, it can ensure that the aperture of the first lens is as small as possible, so as to meet the requirement of small head and be conducive to miniaturization.

第二方面，本申请还提供了一种摄像模组，摄像模组包括镜筒、感光元件和第一方面任一项实施方式所述的光学***，所述光学***的第一透镜至第七透镜均安装在所述镜筒内，所述感光元件设置在所述光学***的像侧。通过在摄像模组中加入本申请提供的光学***，摄像模组能够同时实现小型化和长焦摄像的设计要求，有利于摄像模组应用于各类小体积及对长焦摄像要求较高的拍照设备。In a second aspect, the present application further provides a camera module, the camera module includes a lens barrel, a photosensitive element, and the optical system according to any embodiment of the first aspect, wherein the first lens to seventh lens of the optical system The lenses are all installed in the lens barrel, and the photosensitive element is arranged on the image side of the optical system. By adding the optical system provided by this application to the camera module, the camera module can meet the design requirements of miniaturization and telephoto photography at the same time, which is beneficial for the camera module to be applied to various small-volume and high-demand telephoto cameras. camera equipment.

第三方面，本申请还提供了一种电子设备，电子设备包括壳体和第二方面所述的摄像模组，所述摄像模组设于所述壳体内。通过在电子设备中加入本申请提供的摄像模组，电子设备可完成机身较薄、体积较小的设计要求，同时还能进行远景的高清成像。In a third aspect, the present application further provides an electronic device, the electronic device includes a casing and the camera module described in the second aspect, wherein the camera module is arranged in the casing. By adding the camera module provided by this application to the electronic device, the electronic device can meet the design requirements of a thinner body and a smaller volume, and at the same time, it can also perform high-definition imaging of a long-term view.

附图说明Description of drawings

为了更清楚地说明本申请实施方式或现有技术中的技术方案，下面将对实施方式或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施方式，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings that are used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present application, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

图1a是第一实施例的光学***的结构示意图；1a is a schematic structural diagram of an optical system of the first embodiment;

图1b是第一实施例的纵向球差曲线、像散曲线和畸变曲线；Fig. 1b is the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the first embodiment;

图2a是第二实施例的光学***的结构示意图；2a is a schematic structural diagram of an optical system of a second embodiment;

图2b是第二实施例的纵向球差曲线、像散曲线和畸变曲线；Fig. 2b is the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the second embodiment;

图3a是第三实施例的光学***的结构示意图；3a is a schematic structural diagram of an optical system of a third embodiment;

图3b是第三实施例的纵向球差曲线、像散曲线和畸变曲线；Fig. 3b is the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the third embodiment;

图4a是第四实施例的光学***的结构示意图；4a is a schematic structural diagram of an optical system of a fourth embodiment;

图4b是第四实施例的纵向球差曲线、像散曲线和畸变曲线；Fig. 4b is the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the fourth embodiment;

图5a是第五实施例的光学***的结构示意图；Fig. 5a is the structural schematic diagram of the optical system of the fifth embodiment;

图5b是第五实施例的纵向球差曲线、像散曲线和畸变曲线。Fig. 5b is a longitudinal spherical aberration curve, astigmatism curve and distortion curve of the fifth embodiment.

具体实施方式detailed description

下面将结合本申请实施方式中的附图，对本申请实施方式中的技术方案进行清楚、完整地描述，显然，所描述的实施方式仅仅是本申请一部分实施方式，而不是全部的实施方式。基于本申请中的实施方式，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施方式，都属于本申请保护的范围。The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

本申请实施例提供了一种电子设备，电子设备包括壳体和本申请实施例提供的摄像模组，摄像模组设于壳体内。该电子设备可以为智能手机、个人数字助理(PDA)、平板电脑、智能手表、无人机、电子书籍阅读器、行车记录仪、可穿戴装置、监控设备、各种驾驶辅助***等。通过在电子设备中加入本申请提供的摄像模组，电子设备可完成机身较薄、体积较小的设计要求，同时还能进行远景的高清成像。The embodiment of the present application provides an electronic device, the electronic device includes a casing and the camera module provided by the embodiment of the present application, and the camera module is arranged in the casing. The electronic device may be a smart phone, a personal digital assistant (PDA), a tablet computer, a smart watch, a drone, an electronic book reader, a driving recorder, a wearable device, a monitoring device, various driving assistance systems, and the like. By adding the camera module provided by the present application to the electronic device, the electronic device can meet the design requirements of thinner body and smaller volume, and at the same time, it can also perform high-definition imaging in the long-range.

本申请实施例提供了一种摄像模组，摄像模组包括镜筒、电子感光元件和本申请实施例提供的光学***，光学***的第一透镜至第七透镜安装在镜筒内，电子感光元件设置在光学***的像侧，用于将穿过第一透镜至第七透镜入射到电子感光元件上的物的光线转换成图像的电信号。电子感光元件可以为互补金属氧化物半导体(Complementary Metal Oxide Semiconductor，CMOS)或电荷耦合器件(Charge-coupled Device，CCD)。该摄像模组可以是数码相机的独立的镜头，也可以是集成在如智能手机等电子设备上的成像模块。通过在摄像模组中加入本申请提供的光学***，摄像模组能够同时实现小型化和长焦摄像的设计要求，有利于摄像模组应用于各类小体积及对长焦摄像要求较高的拍照设备。An embodiment of the present application provides a camera module. The camera module includes a lens barrel, an electronic photosensitive element, and the optical system provided by the embodiment of the present application. The first lens to the seventh lens of the optical system are installed in the lens barrel, and the electronic photosensitive element The element is arranged on the image side of the optical system, and is used for converting the light rays incident on the object on the electronic photosensitive element through the first lens to the seventh lens into electrical signals of the image. The electronic photosensitive element may be a complementary metal oxide semiconductor (Complementary Metal Oxide Semiconductor, CMOS) or a charge-coupled device (Charge-coupled Device, CCD). The camera module can be an independent lens of a digital camera, or an imaging module integrated on an electronic device such as a smart phone. By adding the optical system provided by this application to the camera module, the camera module can meet the design requirements of miniaturization and telephoto photography at the same time, which is beneficial for the camera module to be applied to various small-volume and high-demand telephoto cameras. camera equipment.

本申请提供了一种光学***，光学***从物侧至像侧依次包括：The application provides an optical system, and the optical system sequentially includes from the object side to the image side:

第一透镜，具有正曲折力，所述第一透镜的物侧面于近光轴处为凸面；The first lens has a positive bending force, and the object side surface of the first lens is convex at the near optical axis;

第二透镜，具有曲折力；The second lens has a bending force;

第三透镜，具有曲折力，所述第三透镜的像侧面于近光轴处为凹面；The third lens has a bending force, and the image side surface of the third lens is concave at the near optical axis;

第四透镜，具有负曲折力，所述第四透镜的物侧面于近光轴处为凸面，所述第四透镜的像侧面于近光轴处为凹面；the fourth lens has a negative bending force, the object side of the fourth lens is convex at the near optical axis, and the image side of the fourth lens is concave at the near optical axis;

第五透镜，具有曲折力，所述第五透镜的物侧面于近光轴处为凹面；The fifth lens has a bending force, and the object side of the fifth lens is concave at the near optical axis;

第六透镜，具有曲折力，所述第六透镜的像侧面于近光轴处为凸面；The sixth lens has a bending force, and the image side surface of the sixth lens is convex at the near optical axis;

第七透镜，具有负曲折力，所述第七透镜的像侧面于近光轴处为凹面，所述第七透镜的物侧面与像侧面均为非球面，且所述第七透镜的物侧面与像侧面中的至少一者设置有至少一个反曲点。The seventh lens has a negative bending force, the image side of the seventh lens is concave at the near optical axis, the object side and the image side of the seventh lens are both aspherical, and the object side of the seventh lens At least one inflection point is provided with at least one of the image sides.

通过合理配置第一透镜至第七透镜的曲折力以及面型，同时在第七透镜上设置反曲点，便于减小透镜的弯曲程度，从而降低透镜的轴向厚度，有助于缩小***总长，光学***能够兼顾有效焦距和***总长，从而具有足够长的有效焦距以及较短的***总长，能够同时满足小型化和长焦摄像的要求。By reasonably configuring the bending force and surface shape of the first lens to the seventh lens, and setting the inflection point on the seventh lens, it is convenient to reduce the degree of curvature of the lens, thereby reducing the axial thickness of the lens, which helps to reduce the overall length of the system , the optical system can take into account the effective focal length and the total length of the system, so that it has a long enough effective focal length and a short total system length, and can meet the requirements of miniaturization and telephoto photography at the same time.

一种实施方式中，所述光学***满足条件式：f/TTL>1；其中，f为所述光学***的有效焦距，TTL为所述第一透镜的物侧面至所述光学***的成像面于光轴上的距离。通过满足f/TTL的取值高于1，光学***的有效焦距较长，从而具有长焦特性。具体的，f/TTL的值可以为1、1.05、1.1、1.26、2、5等。In an embodiment, the optical system satisfies the conditional formula: f/TTL>1; where f is the effective focal length of the optical system, and TTL is the object side of the first lens to the imaging plane of the optical system distance on the optical axis. By satisfying the value of f/TTL higher than 1, the effective focal length of the optical system is longer, thus having a telephoto characteristic. Specifically, the value of f/TTL may be 1, 1.05, 1.1, 1.26, 2, 5, and so on.

一种实施方式中，所述光学***满足条件式：0mm ^-1＜FNO/(ImgH*2)＜5mm ^-1；其中，FNO为所述光学***的光圈数，Imgh为所述光学***成像面上有效感光区域对角线长度的一半。可以理解的是，Imgh决定了电子感光芯片的大小，Imgh越大，光学***可支持的最大电子感光芯片的尺寸便越大。通过满足FNO/(ImgH*2)的取值在0mm ^-1和5mm ^-1之间，可让光学***支持高像素电子感光芯片；同时，提供了较大的光圈数，可获得更高的进光量，光学***在长焦拍摄下可更容易突出被摄主体，虚化背景。具体的，FNO/(ImgH*2)的值可以为0mm ^-1、0.7mm ^-1、1.35mm ^-1、2.4mm ^-1、3.2mm ^-1、4.8mm ^-1、5mm ^-1等。 In one embodiment, the optical system satisfies the conditional formula: 0mm ^-1 <FNO/(ImgH*2)<5mm ^-1 ; wherein, FNO is the aperture number of the optical system, and Imgh is the imaging surface of the optical system Half of the diagonal length of the upper effective photosensitive area. It can be understood that Imgh determines the size of the electronic photosensitive chip, and the larger the Imgh, the larger the size of the largest electronic photosensitive chip that the optical system can support. By satisfying the value of FNO/(ImgH*2) between 0mm ^-1 and 5mm ^-1 , the optical system can support high-pixel electronic photosensitive chips; at the same time, it provides a larger aperture number, which can achieve higher The amount of light, the optical system can more easily highlight the subject and blur the background under telephoto shooting. Specifically, the value of FNO/(ImgH*2) may be 0 mm ^-1 , 0.7 mm ^-1 , 1.35 mm ^-1 , 2.4 mm ^-1 , 3.2 mm ^-1 , 4.8 mm ^-1 , 5 mm ^-1 , and the like.

一种实施方式中，所述光学***满足条件式：Y11/Y72<0.6；其中，Y11为所述第一透镜物侧面的有效半口径，Y72为所述第七透镜像侧面的有效半口径。通过满足Y11/Y72的取值低于0.6，第一透镜物侧面的有效口径较小，光学***具有小头部尺寸的特点，有利于实现小型化设计。具体的，Y11/Y72的值可以为0.6、0.58、0.54、0.4、0.3等。In an embodiment, the optical system satisfies the conditional formula: Y11/Y72<0.6; wherein, Y11 is the effective semi-aperture of the object side of the first lens, and Y72 is the effective semi-aperture of the image side of the seventh lens. By satisfying that the value of Y11/Y72 is lower than 0.6, the effective aperture of the object side of the first lens is small, and the optical system has the characteristics of small head size, which is conducive to realizing miniaturized design. Specifically, the value of Y11/Y72 may be 0.6, 0.58, 0.54, 0.4, 0.3 and the like.

一种实施方式中，所述光学***满足条件式：1＜BF/CT67＜3；其中，BF为所述第七透镜像侧面至成像面的最短距离，CT67为所述第六透镜的像侧面和所述第七透镜的物侧面于光轴上的间距。通过满足BF/CT67的取值在1和3之间，可确保与电子感光芯片具有良好的匹配性，同时第六透镜和第七透镜具有合理的间距，有助于减少像差和提升解像力。具体的，BF/CT67的值可以为1、1.2、1.5、1.9、2.4、2.8、3等。In one embodiment, the optical system satisfies the conditional formula: 1<BF/CT67<3; wherein, BF is the shortest distance from the image side surface of the seventh lens to the imaging surface, and CT67 is the image side surface of the sixth lens and the distance between the object side of the seventh lens and the optical axis. By satisfying the value of BF/CT67 between 1 and 3, it can ensure good matching with the electronic photosensitive chip, and at the same time, the sixth lens and the seventh lens have a reasonable distance, which helps to reduce aberration and improve resolution. Specifically, the value of BF/CT67 may be 1, 1.2, 1.5, 1.9, 2.4, 2.8, 3, etc.

一种实施方式中，所述光学***满足条件式：6<(Y72*TTL)/(ET7*f)<13；其中，Y72为所述第七透镜像侧面的有效半口径，TTL为所述第一透镜的物侧面至所述光学***的成像面于光轴上的距离，ET7为所述第七透镜的光学有效区域边缘的厚度，f为所述光学***的有效焦距。通过满足(Y72*TTL)/(ET7*f)的取值在6和13之间，可平衡光学***长焦特性与***总长，在保证第七透镜成型良率同时减小光学***的最大直径。具体的，(Y72*TTL)/(ET7*f)的值可以为6、7.5、8.5、9.2、11、12.2、13等。In one embodiment, the optical system satisfies the conditional formula: 6<(Y72*TTL)/(ET7*f)<13; wherein, Y72 is the effective half-aperture of the image side of the seventh lens, and TTL is the The distance from the object side of the first lens to the imaging surface of the optical system on the optical axis, ET7 is the thickness of the edge of the optical effective area of the seventh lens, and f is the effective focal length of the optical system. By satisfying the value of (Y72*TTL)/(ET7*f) between 6 and 13, the telephoto characteristic of the optical system and the total length of the system can be balanced, and the maximum diameter of the optical system can be reduced while ensuring the molding yield of the seventh lens . Specifically, the value of (Y72*TTL)/(ET7*f) may be 6, 7.5, 8.5, 9.2, 11, 12.2, 13 and so on.

一种实施方式中，所述光学***满足条件式：0<f123/R32＜10；其中，f123为所述第一透镜、所述第二透镜和所述第三透镜的组合有效焦距，R32为所述第三透镜像侧面于光轴处的曲率半径。通过满足f123/R32的取值在0和10之间，第三透镜曲率的变化，迅速压缩了光线在光学***中的口径，利于后面透镜对光线的进一步控制；同时提供了较大的第一透镜至第三透镜的组合有效焦距，为光学***有效焦距的提升提供一定帮助。具体的，f123/R32的值可以为0、1、3、5、8、10等。In an embodiment, the optical system satisfies the conditional formula: 0<f123/R32<10; wherein, f123 is the combined effective focal length of the first lens, the second lens and the third lens, and R32 is The curvature radius of the image side surface of the third lens at the optical axis. By satisfying the value of f123/R32 between 0 and 10, the change of the curvature of the third lens quickly compresses the aperture of the light in the optical system, which is conducive to the further control of the light by the rear lens; at the same time, it provides a larger first The combined effective focal length of the lens to the third lens provides certain help for the improvement of the effective focal length of the optical system. Specifically, the value of f123/R32 may be 0, 1, 3, 5, 8, 10 and so on.

一种实施方式中，所述光学***满足条件式：2.5<TTL/∑AT<4；其中，TTL为所述第一透镜的物侧面至所述光学***的成像面于光轴上的距离，∑AT为所述第一透镜至所述第七透镜中相邻的任意两个透镜于光轴上的空气间隔的总和。通过满足TTL/∑AT的取值在2.5和4之间，有利于在可加工范围内减小相邻镜片于光轴的间距，进而减小***总长，实现光学***的超薄特性。可以理解的是，当TTL/∑AT>4时，相邻透镜于光轴的间距过小，增加公差敏感度，不利于镜片组装，增加加工难度。当TTL/∑AT＜2.5时，***总长过短，不利于实现长焦特性。具体的，TTL/∑AT的值可以为2.5、2.78、3.15、3.54、3.8、4等。In one embodiment, the optical system satisfies the conditional formula: 2.5<TTL/∑AT<4; wherein, TTL is the distance from the object side of the first lens to the imaging plane of the optical system on the optical axis, ΣAT is the sum of the air intervals on the optical axis of any two adjacent lenses from the first lens to the seventh lens. By satisfying the value of TTL/∑AT between 2.5 and 4, it is beneficial to reduce the distance between adjacent lenses and the optical axis within the processable range, thereby reducing the total length of the system and realizing the ultra-thin characteristics of the optical system. It can be understood that when TTL/∑AT>4, the distance between adjacent lenses and the optical axis is too small, which increases tolerance sensitivity, is not conducive to lens assembly, and increases processing difficulty. When TTL/∑AT<2.5, the total length of the system is too short, which is not conducive to realizing the telephoto characteristic. Specifically, the value of TTL/ΣAT may be 2.5, 2.78, 3.15, 3.54, 3.8, 4, and so on.

一种实施方式中，所述光学***满足条件式：TTL/EPD<3；其中，TTL为所述第一透镜的物侧面至所述光学***的成像面于光轴上的距离，EPD为所述光学***的入瞳直径。通过满足TTL/EPD的取值低于3，可使***总长较小，并增加进光量。具体的，TTL/EPD的值可以为3、2.5、2.1、1.8、1.5、1、0.2等。In one embodiment, the optical system satisfies the conditional formula: TTL/EPD<3; wherein, TTL is the distance from the object side of the first lens to the imaging plane of the optical system on the optical axis, and EPD is the The entrance pupil diameter of the optical system. By satisfying the value of TTL/EPD below 3, the total length of the system can be reduced and the amount of incoming light can be increased. Specifically, the value of TTL/EPD may be 3, 2.5, 2.1, 1.8, 1.5, 1, 0.2, and so on.

一种实施方式中，所述光学***满足条件式：0.5<|f4567/f|<2；其中，f4567为所述第四透镜、所述第五透镜、所述第六透镜和所述第七透镜的组合有效焦距，f为所述光学***的有效焦距。通过满足|f4567/f|的取值在0.5和2之间，有利于校正光学***的色差和场曲，以及减缓光线偏折角度，降低敏感度，降低镜头成型难度。可以理解的是，当|f4567/f|<0.5时，第四透镜至第七透镜一同贡献给整个***的组合有效焦距过小，引起光线偏折过大，也不利于像差校正，最后导致成像质量降低。当|f4567/f|＞2时，第四透镜至第七透镜的总长占***总长的比重过高，不利于***小型化；而且第四透镜至第七透镜的整体曲折力不足，难以有效平衡第一透镜和第二透镜整体的像差。具体的，|f4567/f|的值可以为0.5、0.8、1.2、1.5、1.8、2等。In an embodiment, the optical system satisfies the conditional formula: 0.5<|f4567/f|<2; where f4567 is the fourth lens, the fifth lens, the sixth lens and the seventh lens The combined effective focal length of the lens, f is the effective focal length of the optical system. By satisfying the value of |f4567/f| between 0.5 and 2, it is beneficial to correct the chromatic aberration and field curvature of the optical system, as well as to slow down the light deflection angle, reduce the sensitivity, and reduce the difficulty of lens shaping. It can be understood that when |f4567/f|<0.5, the combined effective focal length of the fourth lens to the seventh lens together to contribute to the entire system is too small, causing excessive light deflection, which is not conducive to aberration correction, and finally leads to Image quality is reduced. When |f4567/f|>2, the proportion of the total length of the fourth lens to the seventh lens in the total length of the system is too high, which is not conducive to the miniaturization of the system; and the overall bending force of the fourth lens to the seventh lens is insufficient, making it difficult to effectively balance The aberration of the first lens and the second lens as a whole. Specifically, the value of |f4567/f| may be 0.5, 0.8, 1.2, 1.5, 1.8, 2, and so on.

一种实施方式中，所述光学***满足条件式：Y11/f<0.3；其中，Y11为所述第一透镜物侧面的有效半口径，f为所述光学***的有效焦距。通过满足Y11/f的取值低于0.3，在光学***的有效焦距一定的情况下，能保证第一透镜的口径尽可能小，从而满足小头部要求，有利于实现小型化。具体的，Y11/f的值可以为0.3、0.28、0.21、0.15、0.04等。In one embodiment, the optical system satisfies the conditional formula: Y11/f<0.3; wherein, Y11 is the effective semi-aperture of the object side of the first lens, and f is the effective focal length of the optical system. By satisfying that the value of Y11/f is lower than 0.3, under the condition that the effective focal length of the optical system is constant, it can ensure that the aperture of the first lens is as small as possible, so as to meet the requirement of small head and be conducive to miniaturization. Specifically, the value of Y11/f can be 0.3, 0.28, 0.21, 0.15, 0.04 and the like.

第一实施例first embodiment

请参考图1a和图1b，本实施例的光学***，沿物侧至像侧依次包括：Referring to FIG. 1a and FIG. 1b, the optical system of this embodiment includes sequentially from the object side to the image side:

第一透镜L1，具有正曲折力，第一透镜L1的物侧面S1于近光轴处为凸面，像侧面S2于近光轴处为凹面；The first lens L1 has a positive bending force, and the object side S1 of the first lens L1 is convex at the near optical axis, and the image side S2 is concave at the near optical axis;

第二透镜L2，具有正曲折力，第二透镜L2的物侧面S3于近光轴处为凸面，像侧面S4于近光轴处为凸面；The second lens L2 has a positive bending force, and the object side S3 of the second lens L2 is convex at the near optical axis, and the image side S4 is convex at the near optical axis;

第三透镜L3，具有负曲折力，第三透镜L3的物侧面S5于近光轴处为凹面，像侧面S6于近光轴处为凹面；The third lens L3 has a negative bending force, and the object side S5 of the third lens L3 is concave at the near optical axis, and the image side S6 is concave at the near optical axis;

第四透镜L4，具有负曲折力，第四透镜L4的物侧面S7于近光轴处为凸面，像侧面S8于近光轴处为凹面；The fourth lens L4 has a negative bending force, and the object side S7 of the fourth lens L4 is a convex surface at the near optical axis, and the image side S8 is a concave surface at the near optical axis;

第五透镜L5，具有负曲折力，第五透镜L5的物侧面S9于近光轴处为凹面，像侧面S10于近光轴处为凹面。The fifth lens L5 has a negative bending force, the object side S9 of the fifth lens L5 is concave at the near optical axis, and the image side S10 is concave at the near optical axis.

第六透镜L6，具有正曲折力，第六透镜L6的物侧面S11于近光轴处为凸面，像侧面S12于近光轴处为凸面。The sixth lens L6 has a positive bending force, the object side S11 of the sixth lens L6 is convex at the near optical axis, and the image side S12 is convex at the near optical axis.

第七透镜L7，具有负曲折力，第七透镜L7的物侧面S13于近光轴处为凹面，像侧面S14于近光轴处为凹面。The seventh lens L7 has a negative bending force, the object side S13 of the seventh lens L7 is concave at the near optical axis, and the image side S14 is concave at the near optical axis.

上述第一透镜L1至第七透镜L7的材质均为塑料，可助于光学***实现轻量化设计。The materials of the first lens L1 to the seventh lens L7 are all plastic, which can help the optical system to achieve lightweight design.

此外，光学***还包括光阑ST0、红外滤光片IR和成像面IMG。光阑ST0设置在第一透镜L1的物侧，可设于第一透镜L1的圆周处，也可设于第一透镜L1的物侧面S1上，或者设置于与第一透镜L1的物侧面S1具有间隔距离的位置上，光阑STO用于控制进光量。其他实施例中，光阑ST0还可以设置在其他透镜的物侧面和像侧面上。红外滤光片IR设置在第七透镜L7的像侧，其包括物侧面S15和像侧面S16，红外滤光片IR用于过滤掉红外光线，使得射入成像面IMG的光线为可见光，可见光的波长为380nm-780nm。红外滤光片IR的材质为玻璃，并可在玻璃上镀膜。成像面IMG为光学***的像面，其大部分区域与电子感光元件的有效像素区域交叠。In addition, the optical system also includes a diaphragm ST0, an infrared filter IR and an imaging plane IMG. The diaphragm ST0 is arranged on the object side of the first lens L1, and can be arranged at the circumference of the first lens L1, or on the object side S1 of the first lens L1, or arranged on the object side S1 of the first lens L1. At positions with a separation distance, the diaphragm STO is used to control the amount of light entering. In other embodiments, the stop ST0 may also be disposed on the object side and the image side of other lenses. The infrared filter IR is arranged on the image side of the seventh lens L7, which includes the object side S15 and the image side S16, and the infrared filter IR is used to filter out infrared light, so that the light entering the imaging surface IMG is visible light, and the visible light is The wavelength is 380nm-780nm. The infrared filter IR is made of glass and can be coated on glass. The imaging plane IMG is the image plane of the optical system, and most of its area overlaps with the effective pixel area of the electronic photosensitive element.

表1a示出了本实施例的光学***的特性的表格，其中的数据采用波长为587.5618nm的光线获得，Y半径、厚度和焦距的单位均为毫米(mm)。Table 1a shows a table of characteristics of the optical system of the present embodiment, wherein the data is obtained using light with a wavelength of 587.5618 nm, and the units of Y radius, thickness and focal length are all millimeters (mm).

表1aTable 1a

其中，f为光学***的有效焦距，FNO为光学***的光圈数，Semi-FOV为光学***在电子感光元件对角线方向的最大视场角的一半，TTL为第一透镜L1的物侧面S1至成像面IMG的于光轴上的距离。Among them, f is the effective focal length of the optical system, FNO is the aperture number of the optical system, Semi-FOV is half of the maximum field angle of the optical system in the diagonal direction of the electronic photosensitive element, and TTL is the object side S1 of the first lens L1 The distance on the optical axis to the imaging plane IMG.

在本实施例中，第一透镜L1至第七透镜L7的各个透镜的物侧面和像侧面均为非球面，非球面透镜的面型x可利用但不限于以下非球面公式进行限定：In this embodiment, the object side surface and the image side surface of each lens of the first lens L1 to the seventh lens L7 are aspherical, and the surface type x of the aspherical lens can be defined by but not limited to the following aspherical formula:

其中，x为非球面沿光轴方向在高度为h的位置时，距非球面顶点的距离最大矢高；c为非球面的近轴曲率，c＝1/R(即，近轴曲率c为上表1a中Y半径R的倒数)；k为圆锥系数；Ai是非球面第i-th阶的修正系数。Among them, x is the maximum vector height of the distance from the vertex of the aspheric surface when the aspheric surface is at a position of height h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1/R (that is, the paraxial curvature c is the upper In Table 1a, the reciprocal of Y radius R); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface.

表1b给出了可用于第一实施例中各非球面镜面的高次项系数A4、A6、A8、A10、A12、A14、A16、A18和A20。Table 1b gives the higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the aspheric mirror surfaces in the first embodiment.

表1bTable 1b

图1b示出了第一实施例的光学***的纵向球差曲线、像散曲线和畸变曲线。像散曲线和畸变曲线的光线参考波长为587.5618nm，其中，纵向球差曲线表示不同波长的光线经由光学***的各透镜后的会聚焦点偏离；像散曲线子午像面弯曲和弧矢像面弯曲；畸变曲线表示不同视场角对应的畸变大小值。根据图1b可知，第一实施例所给出的光学***能够实现良好的成像品质。FIG. 1b shows longitudinal spherical aberration curves, astigmatism curves and distortion curves of the optical system of the first embodiment. The reference wavelength of the astigmatism curve and the distortion curve is 587.5618nm, among which, the longitudinal spherical aberration curve represents the deviation of the focusing point of the light of different wavelengths after passing through each lens of the optical system; the astigmatic curve is curved in the meridional image plane and the sagittal image plane. ; The distortion curve represents the corresponding distortion value for different field angles. It can be seen from FIG. 1b that the optical system provided in the first embodiment can achieve good imaging quality.

第二实施例Second Embodiment

请参考图2a和图2b，本实施例的光学***，沿物侧至像侧依次包括：Referring to FIG. 2a and FIG. 2b, the optical system of this embodiment includes sequentially from the object side to the image side:

第三透镜L3，具有负曲折力，第三透镜L3的物侧面S5于近光轴处为凸面，像侧面S6于近光轴处为凹面；The third lens L3 has a negative bending force, and the object side S5 of the third lens L3 is convex at the near optical axis, and the image side S6 is concave at the near optical axis;

第五透镜L5，具有正曲折力，第五透镜L5的物侧面S9于近光轴处为凹面，像侧面S10于近光轴处为凸面。The fifth lens L5 has a positive bending force, the object side S9 of the fifth lens L5 is concave at the near optical axis, and the image side S10 is convex at the near optical axis.

第六透镜L6，具有负曲折力，第六透镜L6的物侧面S11于近光轴处为凹面，像侧面S12于近光轴处为凸面。The sixth lens L6 has a negative bending force, the object side S11 of the sixth lens L6 is concave at the near optical axis, and the image side S12 is convex at the near optical axis.

第七透镜L7，具有负曲折力，第七透镜L7的物侧面S13于近光轴处为凸面，像侧面S14于近光轴处为凹面。The seventh lens L7 has a negative bending force, the object side S13 of the seventh lens L7 is convex at the near optical axis, and the image side S14 is concave at the near optical axis.

表2a示出了本实施例的光学***的特性的表格，其中的数据采用波长为587.5618nm的光线获得，Y半径、厚度和焦距的单位均为毫米(mm)。Table 2a shows a table of characteristics of the optical system of the present embodiment, wherein the data is obtained using light with a wavelength of 587.5618 nm, and the units of Y radius, thickness and focal length are all millimeters (mm).

表2aTable 2a

表2b给出了可用于第二实施例中各非球面镜面的高次项系数，其中，各非球面面型可由第一实施例中给出的公式限定。Table 2b shows the coefficients of higher-order terms that can be used for each aspherical mirror surface in the second embodiment, wherein each aspherical surface type can be defined by the formula given in the first embodiment.

表2bTable 2b

图2b示出了第二实施例的光学***的纵向球差曲线、像散曲线和畸变曲线。像散曲线和畸变曲线的光线参考波长为587.5618nm。根据图2b可知，第二实施例所给出的光学***能够实现良好的成像品质。FIG. 2b shows longitudinal spherical aberration curves, astigmatism curves and distortion curves of the optical system of the second embodiment. The reference wavelength of light for astigmatism and distortion curves is 587.5618nm. It can be seen from FIG. 2b that the optical system provided in the second embodiment can achieve good imaging quality.

第三实施例Third Embodiment

请参考图3a和图3b，本实施例的光学***，沿物侧至像侧依次包括：Referring to FIG. 3a and FIG. 3b, the optical system of this embodiment includes sequentially from the object side to the image side:

第二透镜L2，具有正曲折力，第二透镜L2的物侧面S3于近光轴处为凸面，像侧面S4于近光轴处为凹面；The second lens L2 has a positive bending force, and the object side S3 of the second lens L2 is a convex surface at the near optical axis, and the image side S4 is a concave surface at the near optical axis;

第三透镜L3，具有正曲折力，第三透镜L3的物侧面S5于近光轴处为凸面，像侧面S6于近光轴处为凹面；The third lens L3 has a positive bending force, and the object side S5 of the third lens L3 is convex at the near optical axis, and the image side S6 is concave at the near optical axis;

表3a示出了本实施例的光学***的特性的表格，其中的数据采用波长为587.5618nm的光线获得，Y半径、厚度和焦距的单位均为毫米(mm)。Table 3a shows a table of characteristics of the optical system of the present embodiment, wherein the data is obtained with light having a wavelength of 587.5618 nm, and the units of Y radius, thickness and focal length are all millimeters (mm).

表3aTable 3a

表3b给出了可用于第三实施例中各非球面镜面的高次项系数，其中，各非球面面型可由第一实施例中给出的公式限定。Table 3b shows the coefficients of higher-order terms that can be used for each aspherical mirror surface in the third embodiment, wherein each aspherical surface type can be defined by the formula given in the first embodiment.

表3bTable 3b

图3b示出了第三实施例的光学***的纵向球差曲线、像散曲线和畸变曲线。像散曲线和畸变曲线的光线参考波长为587.5618nm。根据图3b可知，第三实施例所给出的光学***能够实现良好的成像品质。FIG. 3b shows longitudinal spherical aberration curves, astigmatism curves and distortion curves of the optical system of the third embodiment. The reference wavelength of light for astigmatism and distortion curves is 587.5618nm. It can be seen from FIG. 3b that the optical system provided in the third embodiment can achieve good imaging quality.

第四实施例Fourth Embodiment

请参考图4a和图4b，本实施例的光学***，沿物侧至像侧依次包括：Referring to FIG. 4a and FIG. 4b, the optical system of this embodiment includes sequentially from the object side to the image side:

第一透镜L1，具有正曲折力，第一透镜L1的物侧面S1于近光轴处为凸面，像侧面S2于近光轴处为凸面；The first lens L1 has a positive bending force, and the object side S1 of the first lens L1 is a convex surface at the near optical axis, and the image side S2 is a convex surface at the near optical axis;

第二透镜L2，具有负曲折力，第二透镜L2的物侧面S3于近光轴处为凹面，像侧面S4于近光轴处为凸面；The second lens L2 has a negative bending force, and the object side S3 of the second lens L2 is a concave surface at the near optical axis, and the image side S4 is a convex surface at the near optical axis;

表4a示出了本实施例的光学***的特性的表格，其中的数据采用波长为587.5618nm的光线获得，Y半径、厚度和焦距的单位均为毫米(mm)。Table 4a shows a table of characteristics of the optical system of the present embodiment, wherein the data is obtained using light with a wavelength of 587.5618 nm, and the units of Y radius, thickness and focal length are all millimeters (mm).

表4aTable 4a

表4b给出了可用于第四实施例中各非球面镜面的高次项系数，其中，各非球面面型可由第一实施例中给出的公式限定。Table 4b shows the coefficients of higher-order terms that can be used for each aspherical mirror surface in the fourth embodiment, wherein each aspherical surface type can be defined by the formula given in the first embodiment.

表4bTable 4b

图4b示出了第四实施例的光学***的纵向球差曲线、像散曲线和畸变曲线。像散曲线和畸变曲线的光线参考波长为587.5618nm。根据图4b可知，第四实施例所给出的光学***能够实现良好的成像品质。FIG. 4b shows longitudinal spherical aberration curves, astigmatism curves and distortion curves of the optical system of the fourth embodiment. The reference wavelength of light for astigmatism and distortion curves is 587.5618nm. It can be seen from FIG. 4b that the optical system provided in the fourth embodiment can achieve good imaging quality.

第五实施例Fifth Embodiment

请参考图5a和图5b，本实施例的光学***，沿物侧至像侧依次包括：Referring to FIG. 5a and FIG. 5b, the optical system of this embodiment includes sequentially from the object side to the image side:

第七透镜L7，具有负曲折力，第七透镜L7的物侧面S13于近光轴处为凸面，像侧面S14于近光轴处为凹面。The seventh lens L7 has a negative bending force. The object side S13 of the seventh lens L7 is convex at the near optical axis, and the image side S14 is concave at the near optical axis.

表5a示出了本实施例的光学***的特性的表格，其中的数据采用波长为587.5618nm的光线获得，Y半径、厚度和焦距的单位均为毫米(mm)。Table 5a shows a table of characteristics of the optical system of this embodiment, wherein the data is obtained using light with a wavelength of 587.5618 nm, and the units of Y radius, thickness and focal length are all millimeters (mm).

表5aTable 5a

表5b给出了可用于第五实施例中各非球面镜面的高次项系数，其中，各非球面面型可由第一实施例中给出的公式限定。Table 5b shows the coefficients of higher-order terms that can be used for each aspherical mirror surface in the fifth embodiment, wherein each aspherical surface type can be defined by the formula given in the first embodiment.

表5bTable 5b

图5b示出了第五实施例的光学***的纵向球差曲线、像散曲线和畸变曲线。像散曲线和畸变曲线的光线参考波长为587.5618nm。根据图5b可知，第五实施例所给出的光学***能够实现良好的成像品质。FIG. 5b shows longitudinal spherical aberration curves, astigmatism curves and distortion curves of the optical system of the fifth embodiment. The reference wavelength of light for astigmatism and distortion curves is 587.5618nm. It can be seen from FIG. 5b that the optical system provided in the fifth embodiment can achieve good imaging quality.

表6示出了第一实施例至第五实施例中光学***的f/TTL、FNO/(ImgH*2)、Y11/Y72、BF/CT67、(Y72*TTL)/(ET7*f)、f123/R32、TTL/∑AT、TTL/EPD、|f4567/f|、Y11/f的值。其中，FNO/(ImgH*2)的单位是毫米 ^-1(mm ^-1) Table 6 shows f/TTL, FNO/(ImgH*2), Y11/Y72, BF/CT67, (Y72*TTL)/(ET7*f), Y11/Y72, BF/CT67, (Y72*TTL)/(ET7*f), Values of f123/R32, TTL/∑AT, TTL/EPD, |f4567/f|, Y11/f. Among them, the unit of FNO/(ImgH*2) is millimeter ^-1 (mm ^-1 )

表6Table 6

由表6可知，第一实施例至第五实施例中的光学***均满足以下条件式：f/TTL>1、0mm ^-1＜FNO/(ImgH*2)＜5mm ^-1、Y11/Y72<0.6、1＜BF/CT67＜3、6<(Y72*TTL)/(ET7*f)<13、0<f123/R32＜10、2.5<TTL/∑AT<4、TTL/EPD<3、0.5<|f4567/f|<2、Y11/f<0.3。 It can be seen from Table 6 that the optical systems in the first to fifth embodiments all satisfy the following conditional expressions: f/TTL>1, 0mm ^-1 <FNO/(ImgH*2)<5mm ^-1 , Y11/Y72< 0.6, 1<BF/CT67<3, 6<(Y72*TTL)/(ET7*f)<13, 0<f123/R32<10, 2.5<TTL/∑AT<4, TTL/EPD<3, 0.5 <|f4567/f|<2, Y11/f<0.3.

以上所揭露的仅为本申请一些较佳实施例而已，当然不能以此来限定本申请之权利范围，本领域普通技术人员可以理解实现上述实施例的全部或部分流程，并依本申请权利要求所作的等同变化，仍属于申请所涵盖的范围。The above disclosures are only some preferred embodiments of the present application. Of course, the scope of the rights of the present application cannot be limited by this. Those of ordinary skill in the art can understand all or part of the procedures for realizing the above-mentioned embodiments, and follow the claims of the present application. The equivalent changes made are still within the scope of the application.

Claims

一种光学***，其特征在于，从物侧至像侧依次包括：An optical system, characterized in that, from the object side to the image side, it comprises:

第一透镜，具有正曲折力，所述第一透镜的物侧面于近光轴处为凸面；The first lens has a positive bending force, and the object side surface of the first lens is convex at the near optical axis;

第二透镜，具有曲折力；The second lens has a bending force;

第三透镜，具有曲折力，所述第三透镜的像侧面于近光轴处为凹面；The third lens has a bending force, and the image side surface of the third lens is concave at the near optical axis;

第四透镜，具有负曲折力，所述第四透镜的物侧面于近光轴处为凸面，所述第四透镜的像侧面于近光轴处为凹面；the fourth lens has a negative bending force, the object side of the fourth lens is convex at the near optical axis, and the image side of the fourth lens is concave at the near optical axis;

第五透镜，具有曲折力，所述第五透镜的物侧面于近光轴处为凹面；The fifth lens has a bending force, and the object side of the fifth lens is concave at the near optical axis;

第六透镜，具有曲折力，所述第六透镜的像侧面于近光轴处为凸面；The sixth lens has a bending force, and the image side surface of the sixth lens is convex at the near optical axis;

第七透镜，具有负曲折力，所述第七透镜的像侧面于近光轴处为凹面，所述第七透镜的物侧面与像侧面均为非球面，且所述第七透镜的物侧面与像侧面中的至少一者设置有至少一个反曲点。The seventh lens has a negative bending force, the image side of the seventh lens is concave at the near optical axis, the object side and the image side of the seventh lens are both aspherical, and the object side of the seventh lens At least one inflection point is provided with at least one of the image sides.
如权利要求1所述的光学***，其特征在于，所述光学***满足条件式：The optical system of claim 1, wherein the optical system satisfies the conditional expression:

f/TTL>1；f/TTL>1;

其中，f为所述光学***的有效焦距，TTL为所述第一透镜的物侧面至所述光学***的成像面于光轴上的距离。Wherein, f is the effective focal length of the optical system, and TTL is the distance on the optical axis from the object side of the first lens to the imaging plane of the optical system.
如权利要求1所述的光学***，其特征在于，所述光学***满足条件式：The optical system of claim 1, wherein the optical system satisfies the conditional expression:

0mm ^-1＜FNO/(Imgh*2)＜5mm ^-1； 0mm ^-1 ＜FNO/(Imgh*2)＜5mm ^-1 ;

其中，FNO为所述光学***的光圈数，Imgh为所述光学***成像面上有效感光区域对角线长度的一半。Wherein, FNO is the aperture number of the optical system, and Imgh is half of the diagonal length of the effective photosensitive area on the imaging surface of the optical system.
如权利要求1所述的光学***，其特征在于，所述光学***满足条件式：The optical system of claim 1, wherein the optical system satisfies the conditional expression:

Y11/Y72<0.6；Y11/Y72<0.6;

其中，Y11为所述第一透镜物侧面的有效半口径，Y72为所述第七透镜像侧面的有效半口径。Wherein, Y11 is the effective semi-aperture of the object side of the first lens, and Y72 is the effective semi-aperture of the image side of the seventh lens.
如权利要求1所述的光学***，其特征在于，所述光学***满足条件式：The optical system of claim 1, wherein the optical system satisfies the conditional formula:

1＜BF/CT67＜3；1<BF/CT67<3;

其中，BF为所述第七透镜像侧面至成像面的最短距离，CT67为所述第六透镜的像侧面和所述第七透镜的物侧面于光轴上的间距。Wherein, BF is the shortest distance from the image side of the seventh lens to the imaging plane, and CT67 is the distance between the image side of the sixth lens and the object side of the seventh lens on the optical axis.
如权利要求1所述的光学***，其特征在于，所述光学***满足条件式：The optical system of claim 1, wherein the optical system satisfies the conditional expression:

6<(Y72*TTL)/(ET7*f)<13；6<(Y72*TTL)/(ET7*f)<13;

其中，Y72为所述第七透镜像侧面的有效半口径，TTL为所述第一透镜的物侧面至所述光学***的成像面于光轴上的距离，ET7为所述第七透镜的光学有效区域边缘的厚度，f为所述光学***的有效焦距。Wherein, Y72 is the effective half-aperture of the image side of the seventh lens, TTL is the distance from the object side of the first lens to the imaging surface of the optical system on the optical axis, and ET7 is the optical axis of the seventh lens The thickness of the edge of the effective area, f is the effective focal length of the optical system.
如权利要求1所述的光学***，其特征在于，所述光学***满足条件式：The optical system of claim 1, wherein the optical system satisfies the conditional expression:

0<f123/R32＜10；0<f123/R32<10;

其中，f123为所述第一透镜、所述第二透镜和所述第三透镜的组合有效焦距，R32为所述第三透镜像侧面于光轴处的曲率半径。Wherein, f123 is the combined effective focal length of the first lens, the second lens and the third lens, and R32 is the radius of curvature of the image side surface of the third lens at the optical axis.
如权利要求1所述的光学***，其特征在于，所述光学***满足条件式：The optical system of claim 1, wherein the optical system satisfies the conditional expression:

2.5<TTL/∑AT<4；2.5<TTL/∑AT<4;

其中，TTL为所述第一透镜的物侧面至所述光学***的成像面于光轴上的距离，∑AT为所述第一透镜至所述第七透镜中相邻的任意两个透镜于光轴上的空气间隔的总和。Among them, TTL is the distance from the object side of the first lens to the imaging plane of the optical system on the optical axis, and ΣAT is the distance between any two adjacent lenses from the first lens to the seventh lens. The sum of the air intervals on the optical axis.
如权利要求1所述的光学***，其特征在于，所述光学***满足条件式：The optical system of claim 1, wherein the optical system satisfies the conditional expression:

TTL/EPD<3；TTL/EPD<3;

其中，TTL为所述第一透镜的物侧面至所述光学***的成像面于光轴上的距离，EPD为所述光学***的入瞳直径。Wherein, TTL is the distance from the object side of the first lens to the imaging plane of the optical system on the optical axis, and EPD is the diameter of the entrance pupil of the optical system.
如权利要求1所述的光学***，其特征在于，所述光学***满足条件式：The optical system of claim 1, wherein the optical system satisfies the conditional expression:

0.5<|f4567/f|<2；0.5<|f4567/f|<2;

其中，f4567为所述第四透镜、所述第五透镜、所述第六透镜和所述第七透镜的组合有效焦距，f为所述光学***的有效焦距。Wherein, f4567 is the combined effective focal length of the fourth lens, the fifth lens, the sixth lens and the seventh lens, and f is the effective focal length of the optical system.
如权利要求1所述的光学***，其特征在于，所述光学***满足条件式：The optical system of claim 1, wherein the optical system satisfies the conditional expression:

Y11/f<0.3；Y11/f<0.3;

其中，Y11为所述第一透镜物侧面的有效半口径，f为所述光学***的有效焦距。Wherein, Y11 is the effective semi-aperture of the object side of the first lens, and f is the effective focal length of the optical system.
一种摄像模组，其特征在于，包括镜筒、感光元件和如权利要求1至11任一项所述的光学***，所述光学***的第一透镜至第七透镜均安装在所述镜筒内，所述感光元件设置在所述光学***的像侧。A camera module, characterized in that it comprises a lens barrel, a photosensitive element and the optical system according to any one of claims 1 to 11, wherein the first lens to the seventh lens of the optical system are all mounted on the mirror In the barrel, the photosensitive element is arranged on the image side of the optical system.
一种电子设备，其特征在于，包括壳体和如权利要求12所述的摄像模组，所述摄像模组设于所述壳体内。An electronic device, comprising a casing and a camera module according to claim 12, wherein the camera module is arranged in the casing.