CN112835183A

CN112835183A - Optical system, camera module, electronic equipment and carrier

Info

Publication number: CN112835183A
Application number: CN202110224152.XA
Authority: CN
Inventors: 乐宇明; 蔡雄宇; 兰宾利; 赵迪
Original assignee: Tianjin OFilm Opto Electronics Co Ltd
Current assignee: Tianjin OFilm Opto Electronics Co Ltd
Priority date: 2021-03-01
Filing date: 2021-03-01
Publication date: 2021-05-25

Abstract

The invention relates to an optical system, a camera module, electronic equipment and a carrier. The optical system includes, in order from an object side to an image side along an optical axis: a first lens element with negative refractive power; a second lens element with negative refractive power having a concave object-side surface at paraxial region; a third lens element with positive refractive power having a convex object-side surface at paraxial region; a fourth lens element with positive refractive power having a convex object-side surface at paraxial region; a fifth lens; a sixth lens element having a concave image-side surface at a paraxial region; the optical system satisfies the relationship: 17.5deg/mm < FOV/EPD < 20 deg/mm; the FOV is the maximum field angle of the optical system and the EPD is the entrance pupil diameter of the optical system. The optical system can simultaneously have the characteristics of large field of view, large aperture and large depth of field, namely, clear imaging can be realized on a close view and a long view within a large field of view, so that images in a larger range and more depth information can be obtained.

Description

Optical system, camera module, electronic equipment and carrier

Technical Field

The present invention relates to the field of photography technologies, and in particular, to an optical system, a camera module, an electronic device, and a carrier.

Background

As the degree of dependence of a driver on the vehicle-mounted camera device increases, the technical requirements of the industry on the vehicle-mounted camera are also increasing. The forward-looking camera and the side-looking camera can be used for monitoring road conditions in front of and on the left and right sides of the automobile respectively, and obtained road condition imaging can be displayed on display equipment in the automobile and also can be transmitted to an advanced driver assistance system for analysis so as to provide information such as driving early warning and suggestion. The vehicle-mounted camera equipment is applied, so that a driver can visually identify and monitor obstacles and pedestrians in a dead zone of the automobile when the automobile runs, driving accidents can be effectively avoided, and driving safety is improved.

However, the depth of field of the conventional vehicle-mounted camera is small, and the requirements for presentation of long-distance details and clear imaging in a large-angle range are difficult to meet at the same time, and in addition, the imaging brightness is difficult to be considered at the same time, so that the definition is further insufficient. These problems often lead to the driver or the assistant driving system being difficult to accurately judge the details of the long-distance road condition in the large visual field range, so as to be difficult to avoid in time, and further difficult to meet the requirements of the industry on the driving safety.

Disclosure of Invention

Therefore, it is necessary to provide an optical system, a camera module, an electronic device, and a carrier for improving the quality of images of a vehicle-mounted camera device in a wide field of view.

An optical system includes, in order from an object side to an image side along an optical axis:

a first lens element with negative refractive power;

a second lens element with negative refractive power having a concave object-side surface at paraxial region;

a third lens element with positive refractive power having a convex object-side surface at paraxial region;

a fourth lens element with positive refractive power having a convex object-side surface at paraxial region;

a fifth lens element with refractive power;

a sixth lens element with refractive power having a concave image-side surface at a paraxial region;

the optical system satisfies the relationship:

17.5deg/mm＜FOV/EPD＜20deg/mm；

the FOV is the maximum field angle of the optical system and the EPD is the entrance pupil diameter of the optical system.

The optical system is favorable for acquiring more object space information by the optical system through enabling the first lens to have the negative refractive power, namely is favorable for increasing the field angle of the optical system. In addition, the refractive power and the surface shape from the second lens to the lens closest to the image side are reasonably matched, so that the imaging aberration of the optical system can be favorably corrected, and the imaging quality of the optical system is improved. Furthermore, by making the optical system satisfy the above-mentioned relational expression conditions, on one hand, the angle of view of the optical system can be enlarged, and the optical system can have a larger angle of view; on the other hand, the optical system can also show the effect of a large aperture and have a larger depth of field range, so that the detailed information of short-distance and long-distance scenes can be better obtained. The optical system can simultaneously have the characteristics of large field of view, large aperture and large depth of field, and can realize clear imaging on a close shot and a long shot in a large field of view range, so that images in a wider range and more depth information can be obtained.

In one embodiment, the optical system further includes a seventh lens element with positive refractive power disposed on the image side of the sixth lens element, and an object-side surface of the seventh lens element is convex at a paraxial region. The seventh lens can still perform good correction on the imaging aberration of the optical system on the premise of keeping the characteristics of a large field of view, a large aperture and a large depth of field of the optical system, so that the imaging quality of the optical system is kept.

In one embodiment, the optical system satisfies the relationship:

FOV is not less than 79.7deg and not more than 80.7 deg. When the relation condition is satisfied, the optical system can be ensured to have the large view field characteristic.

In one embodiment, the optical system satisfies the relationship:

-12.5＜f1/CT1＜-8；

f1 is the effective focal length of the first lens, and CT1 is the thickness of the first lens on the optical axis. When the relation is satisfied, on one hand, the tolerance sensitivity of the central thickness of the first lens in the optical system can be reduced, so that the processing difficulty of the first lens can be reduced, the assembly yield of the optical system can be improved, and the production cost can be further reduced; on the other hand, the phenomenon that the intensity of the negative refractive power provided by the first lens element is too high due to the fact that the absolute value of the focal length of the first lens element is too small can be avoided, and the phenomenon that imaging quality is reduced due to the fact that an optical system generates astigmatism which is difficult to correct is avoided; in addition, the problem that the optical system is difficult to balance aberration generated by the image side lens due to insufficient intensity of the negative refractive power caused by overlarge absolute value of the focal length of the first lens element can also be avoided. Meanwhile, the condition of the relation is satisfied, and the central thickness of the first lens is prevented from being too large or too small. The larger the center thickness of the lens is, the larger the weight of the lens is, which is not favorable for the light-weight design of the optical system; the smaller the center thickness of the lens is, the more difficult the processing technique of the lens is.

In one embodiment, the optical system satisfies the relationship:

1＜(R1+R2)/(R1-R2)＜4；

r1 is a radius of curvature of an object-side surface of the first lens at an optical axis, and R2 is a radius of curvature of an image-side surface of the first lens at the optical axis. When the relationship is satisfied, the surface types of the object side surface and the image side surface of the first lens can be well constrained, so that the first lens can well balance the marginal field aberration of the optical system, the generation of astigmatism is restrained, the incident angle of the chief ray of the marginal visual angle on the imaging surface is favorably reduced, and the problem of dark angle is prevented. If the relationship is exceeded, the surface shape of the first lens is likely to be too curved or too gentle, which is disadvantageous in balancing the aberration of the optical system.

In one embodiment, the optical system satisfies the relationship:

-8.5＜f2/f＜-1.3；

f2 is the effective focal length of the second lens, and f is the effective focal length of the optical system. The second lens provides negative refractive power for the optical system, and when the relational expression condition is met, beam expansion of incident light rays is facilitated, so that light ray beams incident from a large angle can be widened after being refracted by the second lens to fill the pupil, the incident light rays can be fully transmitted to a larger image height on an imaging surface, a wider field range is facilitated, the optical system has large image surface characteristics, and high pixel characteristics of the optical system are facilitated to be embodied. When the refractive power of the second lens element exceeds the range of the relationship, the refractive power of the second lens element becomes too strong or too weak, which is not favorable for correcting the aberration of the optical system, thereby reducing the imaging quality.

In one embodiment, the optical system satisfies the relationship:

1＜f3/f＜6；

f3 is the effective focal length of the third lens, and f is the effective focal length of the optical system. Because the first lens element and the second lens element are both negative lens elements, when the peripheral field rays pass through the first lens element and the second lens element, a larger field curvature is generated, and therefore by providing the third lens element with positive refractive power satisfying the above relationship conditions, the peripheral aberration generated by the first lens element and the second lens element can be effectively corrected, and the imaging resolution of the optical system is improved. When the range of the relational expression is exceeded, the aberration of the optical system is disadvantageously corrected, resulting in a decrease in the imaging quality.

In one embodiment, the optical system satisfies the relationship:

1＜fx/f＜3.5；

fx is an effective focal length of a lens group formed by the fourth lens and the lens closest to the image side in the optical system, and f is the effective focal length of the optical system. The fourth lens to the lens closest to the image side in the optical system can form a rear lens group, and when the relationship is met, the rear lens group can have proper refractive power strength, so that the emergent angle of light rays emitted out of the rear lens group is favorably controlled, and the high-level aberration of the optical system is reduced; on the other hand, the field curvature aberration generated by the front lens group can be effectively corrected, so that the imaging quality of the optical system can be improved.

In one embodiment, the optical system satisfies the relationship:

0.5＜CT2/|Sags3|＜5；

CT2 is the thickness of the second lens on the optical axis, and Sags3 is the sagittal height of the object-side surface of the third lens at the maximum effective aperture. When the relation is satisfied, the center thickness of the second lens element can be well matched with the object side surface type, so that the manufacturing difficulty of the lens element due to the fact that the center thickness of the second lens element is too large or the object side surface of the second lens element is too bent can be effectively avoided under the condition that the second lens element has strong refractive power, and the manufacturing cost of the lens element is further reduced. When the value is lower than the lower limit of the relational expression, the object side surface of the second lens is too curved, so that the marginal field is easy to generate marginal aberration, which is not beneficial to the improvement of the image quality of the optical system. When the distance is higher than the upper limit of the relation, the object-side surface of the second lens is too gentle, so that the risk of generating ghost images is easily increased, and the image quality of the optical system is not improved.

In one embodiment, the optical system satisfies the relationship:

4.5＜TTL/f＜5.5；

TTL is a distance on an optical axis from an object-side surface of the first lens element to an imaging surface of the optical system, and f is an effective focal length of the optical system. When the relation is satisfied, the relation between the total optical length and the effective focal length of the optical system can be reasonably restricted, so that the optical system can effectively compress the total optical length while having a larger field angle, and the miniaturization design is satisfied. If the upper limit of the relationship condition is exceeded, the total length of the optical system becomes too long, which is disadvantageous for the miniaturization design. If the focal length is lower than the lower limit of the condition, the focal length of the optical system is too long, which is not favorable for the optical system to have a large field range, and is difficult to obtain enough object space information.

A camera module comprises an image sensor and the optical system, wherein the image sensor is arranged on the image side of the optical system. Through adopting above-mentioned optical system, the module of making a video recording will possess the characteristics of big visual field, big light ring and big depth of field, can realize clear formation of image to the short-range view and the long-range view of big visual field within range promptly to can obtain image and more degree of depth information on a wider scale.

An electronic device comprises a fixing piece and the camera module, wherein the camera module is arranged on the fixing piece. Through adopting the camera module, the electronic equipment can realize clear imaging on the close shot and the long shot within a large view field range, so that more range of images and more depth information can be obtained.

A carrier comprises an installation part and the electronic equipment, wherein the electronic equipment is arranged on the installation part. The carrier can obtain a larger visual field range through the electronic equipment, can better capture the detail information of the road conditions at near and far positions, and can keep good imaging quality. Therefore, the vehicle can obtain clearer and more accurate road condition information, so that a driver or an auxiliary driving system can make judgment in time to avoid obstacles, and the driving safety is improved.

Drawings

Fig. 1 is a schematic structural diagram of an optical system according to a first embodiment of the present application;

FIG. 2 includes a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the optical system in the first embodiment;

fig. 3 is a schematic structural diagram of an optical system according to a second embodiment of the present application;

FIG. 4 includes a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the optical system in the second embodiment;

fig. 5 is a schematic structural diagram of an optical system according to a third embodiment of the present application;

FIG. 6 includes a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the optical system in the third embodiment;

fig. 7 is a schematic structural diagram of an optical system according to a fourth embodiment of the present application;

FIG. 8 includes a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the optical system in the fourth embodiment;

fig. 9 is a schematic structural diagram of an optical system according to a fifth embodiment of the present application;

FIG. 10 includes a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of the optical system in the fifth embodiment;

fig. 11 is a schematic view of a camera module according to an embodiment of the present application;

fig. 12 is a schematic structural diagram of an electronic device according to an embodiment of the present application;

fig. 13 is a schematic structural diagram of a carrier according to an embodiment of the present application.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "transverse," "length," "thickness," "upper," "front," "rear," "axial," "radial," and the like are used in the orientations and positional relationships indicated in the drawings for the purpose of convenience and simplicity of description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Referring to fig. 1, some embodiments of the present application provide an optical system 10 with a six-plate structure, where the optical system 10 includes, in order from an object side to an image side along an optical axis 101, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6.

The first lens L1 includes an object side surface S1 and an image side surface S2, the second lens L2 includes an object side surface S3 and an image side surface S4, the third lens L3 includes an object side surface S5 and an image side surface S6, the fourth lens L4 includes an object side surface S7 and an image side surface S8, the fifth lens L5 includes an object side surface S9 and an image side surface S10, and the sixth lens L6 includes an object side surface S11 and an image side surface S12. Meanwhile, the optical system 10 further has an imaging plane S15, and the imaging plane S15 is located on the image side of the sixth lens L6. In the embodiment of the optical system 10 with the six-plate structure, the first lens element L1 has negative refractive power; the second lens element L2 with negative refractive power has a concave object-side surface S3 at paraxial region; the third lens element L3 with positive refractive power has a convex object-side surface S5 at paraxial region; the fourth lens element L4 with positive refractive power has a convex object-side surface S7 at paraxial region; the image-side surface S12 of the sixth lens element L6 is concave at the paraxial region.

Referring to fig. 5, further embodiments of the present application further provide an optical system 10 having a seven-piece structure, in which the optical system 10 further includes a seventh lens L7 disposed on the image side of the sixth lens L6, and the seventh lens L7 includes an object-side surface S13 and an image-side surface S14. The seventh lens element L7 with positive refractive power has a convex object-side surface S13 at paraxial region. And the imaging surface S15 of the optical system 10 in these embodiments is located on the image side of the seventh lens L7.

It should be noted that, in general, the imaging surface S15 of the optical system 10 coincides with the photosensitive surface of the image sensor, and for ease of understanding, the imaging surface S15 may also be regarded as the photosensitive surface of the photosensitive element. And when the embodiments of the present application describe that one surface of the lens is convex or concave at a paraxial region, the surface profile of the lens surface near the optical axis 101 can be understood as convex or concave.

With the optical system 10 having the six-piece structure and the optical system 10 having the seven-piece structure, the optical system 10 can acquire more object space information and the field angle of the optical system 10 can be increased by making the first lens element L1 have negative refractive power. In addition, the refractive powers and the surface shapes of the lens elements from the second lens element L2 to the lens element closest to the image side (the sixth lens element L6 for the optical system 10 with the six-piece structure, and the seventh lens element L7 for the optical system 10 with the seven-piece structure) are reasonably matched, so that the imaging aberration of the optical system 10 can be corrected, and the imaging quality of the optical system 10 can be improved.

Further, for the optical system 10 having a six-piece structure and the optical system 10 having a seven-piece structure in the embodiment of the present application, the following relationship conditions are also satisfied:

17.5deg/mm＜FOV/EPD＜20deg/mm；

the FOV is the maximum field angle of the optical system 10 and the EPD is the entrance pupil diameter of the optical system 10. The optical system 10 is generally assembled with an image sensor to form a camera module, the rectangular effective pixel area of the image sensor has a diagonal direction, and when the image sensor is assembled, the FOV can also be understood as the maximum field angle of the optical system 10 in the diagonal direction. By making the optical system 10 satisfy the above-described relational expression conditions, on the one hand, the angle of view of the optical system 10 can be enlarged, and the optical system 10 can have a large angle of view; on the other hand, the optical system 10 can also embody the effect of a large aperture and have a large depth of field range, so that the detailed information of short-distance and long-distance scenes can be better obtained. That is, the optical system 10 can simultaneously have the characteristics of a large field of view, a large aperture and a large depth of field, and can realize clear imaging of a close view and a long view within a large field of view, so that an image in a wider range and more depth information can be obtained. In some embodiments, the relationship satisfied by optical system 10 may specifically be 17.7, 17.9, 18.25, 18.57, 18.74, 19.23, 19.51, 19.62, or 19.7, each in deg/mm.

Further, for the optical system 10 having the six-piece structure and the optical system 10 having the seven-piece structure in the embodiments of the present application, both also satisfy at least one of the following relationships in some embodiments, and when either relationship is satisfied, the corresponding technical effect can be brought about:

-12.5 < f1/CT1 < -8; f1 is the effective focal length of the first lens L1, and CT1 is the thickness of the first lens L1 on the optical axis 101. When the above relationship is satisfied, on one hand, the tolerance sensitivity of the center thickness of the first lens L1 in the optical system 10 can be reduced, so that the difficulty of the processing technique of the first lens L1 can be reduced, which is beneficial to improving the assembly yield of the optical system 10 and further reducing the production cost; on the other hand, the situation that the absolute value of the focal length of the first lens element L1 is too small to cause the intensity of the negative refractive power provided by the first lens element L1 to be too large can be avoided, so that the optical system 10 is prevented from generating astigmatism which is difficult to correct to cause the image quality to be degraded; in addition, it is also avoided that the absolute value of the focal length of the first lens element L1 is too large, which results in insufficient intensity of the negative refractive power, and thus the optical system 10 is difficult to balance the aberration generated by the image side lens. Meanwhile, when the above-described relation is satisfied, the center thickness of the first lens L1 is prevented from being too large or too small. The larger the center thickness of the lens, the larger the weight of the lens, which is not favorable for the light weight design of the optical system 10; the smaller the center thickness of the lens is, the more difficult the processing technique of the lens is. In some embodiments, the relationship that optical system 10 satisfies may be specifically-12.43, -12.32, -12.15, -11.76, -11.62, -10.77, -10.26, -9.8, -9, -8.7, -8.55, or-8.32.

FOV is not less than 79.7deg and not more than 80.7 deg. When this relationship condition is satisfied, the optical system 10 can be ensured to have a large field of view characteristic.

1 < (R1+ R2)/(R1-R2) < 4; r1 is the radius of curvature of the object-side surface S1 of the first lens element L1 at the optical axis 101, and R2 is the radius of curvature of the image-side surface S2 of the first lens element L1 at the optical axis 101. When the above relationship is satisfied, the surface shapes of the object-side surface S1 and the image-side surface S2 of the first lens element L1 are well constrained, so that the first lens element L1 can well balance the peripheral field aberration of the optical system 10, thereby suppressing the occurrence of astigmatism, and being beneficial to reducing the incident angle of the chief ray at the peripheral angle on the image plane S15, thereby preventing the dark angle problem. If the relationship is exceeded, the surface shape of the first lens L1 is likely to be too curved or too gentle, which is disadvantageous in balancing the aberrations of the optical system 10. In some embodiments, the relationship satisfied by optical system 10 may be specifically 1.25, 1.33, 1.47, 1.59, 1.85, 2.1, 2.34, 2.68, 2.96, 3.22, 3.35, or 3.55.

-8.5 < f2/f < -1.3; f2 is the effective focal length of the second lens L2, and f is the effective focal length of the optical system 10. The second lens element L2 provides negative refractive power for the optical system 10, and when the condition of the relationship is satisfied, it is favorable for expanding incident light beams, so that light beams incident at a large angle can be widened after being refracted by the second lens element L2 to fill the pupil, and the incident light beams can be fully transmitted to a larger image height on the imaging surface S15, thereby being favorable for obtaining a wider field range, and making the optical system 10 have a large image plane characteristic, and further being favorable for embodying the high pixel characteristic of the optical system 10. If the refractive power of the second lens element L2 is too strong or too weak, the aberration of the optical system 10 is not corrected, and the image quality is degraded. In some embodiments, the relationship that optical system 10 satisfies may be specifically-8.15, -7.8, -7.32, -6.5, -5.43, -4.91, -4.22, -3.5, -3.2, -2.76, or-2.53.

F3/f is more than 1 and less than 6; f3 is the effective focal length of the third lens L3, and f is the effective focal length of the optical system 10. Since the first lens element L1 and the second lens element L2 are both negative lenses, when the marginal field rays pass through the first lens element L1 and the second lens element L2, a larger curvature of field is generated, and therefore by providing the third lens element L3 with positive refractive power, which satisfies the above relationship, the marginal aberration generated by the first lens element L1 and the second lens element L2 can be effectively corrected, and the imaging resolution of the optical system 10 is improved. When the range of the relational expression is exceeded, the aberration of the optical system 10 is disadvantageously corrected, resulting in a decrease in the imaging quality. In some embodiments, the relationship satisfied by optical system 10 may be specifically 1.56, 1.73, 1.86, 2.2, 2.9, 3.65, 4.2, 4.87, 5.41, or 5.75.

Fx/f is more than 1 and less than 3.5; fx is the effective focal length of the lens group from the fourth lens L4 to the lens closest to the image side in the optical system 10, and f is the effective focal length of the optical system 10. When the optical system 10 has a six-piece structure, fx represents an effective focal length of the rear lens group constituted by the fourth lens L4, the fifth lens L5, and the sixth lens L6; when the optical system 10 has a seven-piece structure, fx represents an effective focal length of the rear lens group formed by the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7. The fourth lens element L4 to the lens element closest to the image side in the optical system 10 can form a rear lens group, which has suitable refractive power when the above relationship is satisfied, and on one hand, it is beneficial to control the exit angle of the light exiting the rear lens group so as to reduce the high-order aberration of the optical system 10; on the other hand, the field curvature aberration generated by the front lens group can be effectively corrected, thereby being helpful for improving the imaging quality of the optical system 10. In some embodiments, the relationship satisfied by optical system 10 may be specifically 1.25, 1.37, 1.52, 1.83, 2.2, 2.55, 2.73, 2.95, 3.04, or 3.13.

0.5 < CT2/| Sags3| < 5; CT2 is the thickness of the second lens L2 on the optical axis 101, and Sags3 is the sagittal height of the object side S5 of the third lens L3 at the maximum effective aperture. Sags3 can also be interpreted as the distance from the intersection of the object side surface S3 of the second lens L2 with the optical axis 101 to the maximum effective aperture in the direction parallel to the optical axis 101. When the above relationship is satisfied, the center thickness of the second lens element L2 and the shape of the object-side surface S3 can be well matched, so that the manufacturing difficulty of the lens element due to the excessive center thickness of the second lens element L2 or the excessive bending of the object-side surface S3 can be effectively avoided under the condition that the second lens element L2 has strong refractive power, and the manufacturing cost of the lens element can be further reduced. If the value is lower than the lower limit of the relational expression, the object-side surface S3 of the second lens element L2 is too curved, so that peripheral aberration is likely to occur in the peripheral field of view, which is not favorable for improving the image quality of the optical system 10. Above the upper limit of the relationship, the object-side surface S3 of the second lens L2 is too gentle, so that the risk of ghost image generation is easily increased, and the image quality of the optical system 10 is also not improved. In some embodiments, the relationship satisfied by optical system 10 may be specifically 0.59, 0.63, 0.67, 0.75, 0.83, 0.95, 1.24, 1.72, 2.5, 3.7, 4.2, 4.55, or 4.76.

TTL/f is more than 4.5 and less than 5.5; TTL is a distance from the object-side surface S1 of the first lens element L1 to the image plane S15 of the optical system 10 on the optical axis 101, and f is an effective focal length of the optical system 10. When the above relation is satisfied, the relation between the total optical length of the optical system 10 and the effective focal length can be restricted reasonably, so that the optical system 10 can effectively compress the total optical length while having a larger field angle, thereby satisfying the miniaturization design. If the upper limit of the relationship condition is exceeded, the total length of the optical system 10 becomes too long, which is disadvantageous for the compact design. If the value is lower than the lower limit of the above condition, the focal length of the optical system 10 is too long, which is disadvantageous to the optical system 10 having a large field range and makes it difficult to obtain sufficient object space information. In some embodiments, the relationship that optical system 10 satisfies may be specifically 4.7, 4.75, 4.86, 4.97, 5.08, 5.14, or 5.18.

It should be noted that the reference wavelength of the parameters in the above relational expression conditions is 546nm, and the above relational expression conditions and the technical effects brought by the same are directed to the six-piece optical system 10 and the seven-piece optical system 10 having the above lens design. When the lens design (the number of lenses, the refractive power arrangement, the surface type arrangement, etc.) of the optical system 10 cannot be ensured, it is difficult to ensure that the optical system 10 can still have the corresponding technical effect while satisfying the relationships, and even the imaging performance may be significantly reduced.

The optical system 10 includes a stop STO (refer to fig. 3), which is an aperture stop and is used to control the light entering amount of the optical system 10, and can block the ineffective light and control the depth of field. The stop STO may be disposed on the object side of the first lens L1, or may be disposed between two adjacent lenses in the optical system 10. The stop STO may be formed by a barrel structure holding the lenses, may be a washer fitted between the lenses, or may be formed by a light-shielding coating on the surface of the lenses.

In some embodiments, at least one lens in optical system 10 has an aspheric surface, which may be referred to as a lens having an aspheric surface when a surface (object-side or image-side) of the lens is aspheric. Specifically, both the object-side surface and the image-side surface of each lens may be designed to be aspherical. The aspheric surface can further help the optical system 10 to effectively eliminate aberration, improve imaging quality, and facilitate the miniaturization design of the optical system 10, so that the optical system 10 can have excellent optical effect on the premise of keeping the miniaturization design. Of course, in other embodiments, at least one lens in the optical system 10 may have a spherical surface shape, and the design of the spherical surface shape may reduce the difficulty and cost of manufacturing the lens. It should be noted that there may be some deviation in the ratios of the dimensions of the thickness, surface curvature, etc. of the respective lenses in the drawings. It should be noted that when the object-side surface or the image-side surface of a certain lens is aspheric, the surface may be a structure that is convex as a whole or concave as a whole; alternatively, the surface may be designed to have a point of inflection, where the surface profile of the surface changes from center to edge, e.g., the surface is convex at the center and concave at the edges. In addition, the specific surface type structure (concave-convex relationship) of the lens surface may be various, and is not limited to the above example.

The surface shape of the aspheric surface can be calculated by referring to an aspheric surface formula:

z is the distance from a corresponding point on the aspheric surface to a tangent plane of the surface at the optical axis, r is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the aspheric surface at the optical axis, k is a conical coefficient, and Ai is a high-order term coefficient corresponding to the ith-order high-order term in the aspheric surface type formula.

On the other hand, in some embodiments, at least one of the lenses of the optical system 10 is made of plastic. In some embodiments, at least one of the lenses of the optical system 10 is made of glass. The plastic lens can reduce the weight of the optical system 10 and the production cost, while the glass lens can withstand higher temperatures and has excellent and stable optical performance. In some embodiments, each lens in the optical system 10 may be made of plastic, or each lens may be made of glass. Of course, the arrangement relationship of the lens materials in the optical system 10 is not limited to the above embodiments, and the material of any lens may be plastic or glass, and the specific design may be determined according to actual requirements.

The optical system 10 of the present application is described in more detail with reference to the following examples:

first embodiment

Referring to fig. 1 and 2, the first embodiment provides an optical system 10 with a six-piece structure, and the optical system 10 includes, in order from an object side to an image side along an optical axis 101, a first lens element L1 with negative refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with negative refractive power, and a sixth lens element L6 with positive refractive power. Fig. 2 includes a longitudinal spherical aberration diagram, an astigmatism diagram, and a distortion diagram of the optical system 10 in the first embodiment, wherein the reference wavelength of the astigmatism diagram and the distortion diagram is 546 nm.

The object-side surface S1 of the first lens element L1 is convex, and the image-side surface S2 is concave.

The object-side surface S3 of the second lens element L2 is concave, and the image-side surface S4 is convex.

The object-side surface S5 of the third lens element L3 is convex, and the image-side surface S6 is convex.

The object-side surface S7 of the fourth lens element L4 is convex, and the image-side surface S8 is convex.

The object-side surface S9 of the fifth lens element L5 is concave, and the image-side surface S10 is concave.

The object-side surface S11 of the sixth lens element L6 is convex, and the image-side surface S12 is concave.

The object-side and image-side surfaces of the second lens L2, the third lens L3, and the sixth lens L6 are aspheric, and the object-side and image-side surfaces of the first lens L1, the fourth lens L4, and the fifth lens L5 are spherical. The image side surface S6 of the third lens L3 is a stop surface.

The fourth lens L4 and the fifth lens L5 constitute a cemented lens. In the optical system 10, each lens is made of glass.

In this embodiment, each lens parameter of the optical system 10 is given by the following tables 1 and 2. Table 2 presents the aspheric coefficients of the corresponding lens surfaces in table 1, where K is the conic coefficient and Ai is the coefficient corresponding to the ith order higher order term in the aspheric surface profile formula. The elements from the object side to the image side of the system are arranged in the order from top to bottom in table 1. Surfaces corresponding to surface numbers S1 and S2 respectively represent an object-side surface S1 and an image-side surface S2 of the first lens L1, that is, a surface having a smaller surface number is an object-side surface and a surface having a larger surface number is an image-side surface in the same lens. The Y radius is the radius of curvature of the corresponding surface of the lens at the optical axis 101. The absolute value of the first value of the lens in the "thickness" parameter set is the thickness of the lens on the optical axis 101, and the absolute value of the second value is the distance from the image-side surface of the lens to the next optical element (lens or stop) on the optical axis 101. The reference wavelengths of the refractive index, abbe number, and focal length of each lens in the table are 546nm, and the numerical units of the Y radius, thickness, and focal length (effective focal length) are millimeters (mm). In addition, the parameter data and the lens surface shape structure used for the relational expression calculation in the following embodiments are subject to the data in the lens parameter table in the corresponding embodiment.

TABLE 1

As can be seen from table 1, the effective focal length f of the optical system 10 in the first embodiment is 6.53mm, the f-number is 1.6, and the maximum field angle FOV is 79.9 °.

TABLE 2

Number of noodles

3

4

5

6

10

11

K

-2.391E+00

-3.038E-01

2.610E+00

2.173E+00

5.508E+00

-6.022E+02

A4

-1.227E-04

1.655E-03

3.723E-04

2.837E-04

1.541E-04

1.197E-03

A6

3.459E-05

-3.489E-05

-3.879E-05

2.414E-06

-1.591E-06

-7.302E-06

A8

-3.688E-06

1.912E-07

1.276E-06

-3.240E-07

-1.610E-06

2.231E-07

A10

2.556E-07

0.000E+00

-2.381E-08

2.246E-08

1.910E-08

-3.289E-07

A12

-1.120E-09

0.000E+00

-5.078E-10

-5.977E-10

2.966E-08

A14

0.000E+00

-3.001E-12

0.000E+00

-1.226E-09

A16

0.000E+00

1.028E-13

0.000E+00

1.971E-11

A18

0.000E+00

A20

0.000E+00

In the first embodiment, the optical system 10 satisfies the following relationships:

FOV/EPD＝19.577deg/mm；

the FOV is the maximum field angle of the optical system 10 and the EPD is the entrance pupil diameter of the optical system 10. The optical system 10 is generally assembled with an image sensor to form a camera module, the rectangular effective pixel area of the image sensor has a diagonal direction, and when the image sensor is assembled, the FOV can also be understood as the maximum field angle of the optical system 10 in the diagonal direction. By making the optical system 10 satisfy the above-described relational expression conditions, on the one hand, the angle of view of the optical system 10 can be enlarged, and the optical system 10 can have a large angle of view; on the other hand, the optical system 10 can also embody the effect of a large aperture and have a large depth of field range, so that the detailed information of short-distance and long-distance scenes can be better obtained. That is, the optical system 10 can simultaneously have the characteristics of a large field of view, a large aperture and a large depth of field, that is, can realize clear imaging for a close view and a long view within a large field of view, so as to obtain an image in a wider range and more depth information.

f1/CT1 ═ -12.483; f1 is the effective focal length of the first lens L1, and CT1 is the thickness of the first lens L1 on the optical axis 101. When the above relationship is satisfied, on one hand, the tolerance sensitivity of the center thickness of the first lens L1 in the optical system 10 can be reduced, so that the difficulty of the processing technique of the first lens L1 can be reduced, which is beneficial to improving the assembly yield of the optical system 10 and further reducing the production cost; on the other hand, the situation that the absolute value of the focal length of the first lens element L1 is too small to cause the intensity of the negative refractive power provided by the first lens element L1 to be too large can be avoided, so that the optical system 10 is prevented from generating astigmatism which is difficult to correct to cause the image quality to be degraded; in addition, the problem that the absolute value of the focal length of the first lens element L1 is too large, which results in insufficient intensity of the negative refractive power, and thus it is difficult to balance the aberration generated by the image side lens element can be avoided.

(R1+ R2)/(R1-R2) ═ 1.683; r1 is the radius of curvature of the object-side surface S1 of the first lens element L1 at the optical axis 101, and R2 is the radius of curvature of the image-side surface S2 of the first lens element L1 at the optical axis 101. When the above relationship is satisfied, the surface shapes of the object-side surface S1 and the image-side surface S2 of the first lens L1 can be configured appropriately, so that the first lens L1 can well balance the peripheral field aberration of the optical system 10, thereby suppressing the occurrence of astigmatism, and contributing to reducing the incident angle of the principal ray at the peripheral angle on the image plane S15, thereby preventing the occurrence of the vignetting problem.

f 2/f-4.213; f2 is the effective focal length of the second lens L2, and f is the effective focal length of the optical system 10. The second lens element L2 provides negative refractive power for the optical system 10, and when the condition of the relationship is satisfied, it is favorable for expanding incident light beams, so that light beams incident at a large angle can be widened after being refracted by the second lens element L2 to fill the pupil, and the incident light beams can be fully transmitted to a larger image height on the imaging surface S15, thereby being favorable for obtaining a wider field range, and making the optical system 10 have a large image plane characteristic, and further being favorable for embodying the high pixel characteristic of the optical system 10.

f3/f is 1.84; f3 is the effective focal length of the third lens L3, and f is the effective focal length of the optical system 10. Since the first lens element L1 and the second lens element L2 are both negative lenses, when the marginal field rays pass through the first lens element L1 and the second lens element L2, a larger curvature of field is generated, and therefore by providing the third lens element L3 with positive refractive power, which satisfies the above relationship, the marginal aberration generated by the first lens element L1 and the second lens element L2 can be effectively corrected, and the imaging resolution of the optical system 10 is improved.

3.165 for fx/f; fx is the effective focal length of the lens group from the fourth lens L4 to the lens closest to the image side in the optical system 10, and f is the effective focal length of the optical system 10. The fourth lens element L4 to the lens element closest to the image side in the optical system 10 can form a rear lens group, which has suitable refractive power when the above relationship is satisfied, and on one hand, it is beneficial to control the exit angle of the light exiting the rear lens group so as to reduce the high-order aberration of the optical system 10; on the other hand, the field curvature aberration generated by the front lens group can be effectively corrected, thereby being helpful for improving the imaging quality of the optical system 10.

CT2/| Sags3| -0.615; CT2 is the thickness of the second lens L2 on the optical axis 101, and Sags3 is the sagittal height of the object side S5 of the third lens L3 at the maximum effective aperture. When the above relationship is satisfied, the center thickness of the second lens element L2 and the shape of the object-side surface S3 can be well matched, so that the manufacturing difficulty of the lens element due to the excessive center thickness of the second lens element L2 or the excessive bending of the object-side surface S3 can be effectively avoided under the condition that the second lens element L2 has strong refractive power, and the manufacturing cost of the lens element can be further reduced.

TTL/f is 4.911; TTL is a distance from the object-side surface S1 of the first lens element L1 to the image plane S15 of the optical system 10 on the optical axis 101, and f is an effective focal length of the optical system 10. When the above relation is satisfied, the relation between the total optical length of the optical system 10 and the effective focal length can be restricted reasonably, so that the optical system 10 can effectively compress the total optical length while having a larger field angle, thereby satisfying the miniaturization design.

The optical system 10 can simultaneously have the characteristics of large field of view, large aperture and large depth of field, and can realize clear imaging on a close shot and a long shot within a large field of view. The optical system 10 can be preferably applied to a vehicle-mounted camera device, so that a driver or an auxiliary driving system can obtain an excellent road condition image, thereby improving driving safety.

Fig. 2 includes a Longitudinal Spherical Aberration diagram (Longitudinal Spherical Aberration) of optical system 10, which shows the convergent focus deviation of light rays of different wavelengths through the lens. The ordinate of the longitudinal spherical aberration diagram represents the Normalized Pupil coordinate (Normalized Pupil Coordinator) from the Pupil center to the Pupil edge, and the abscissa represents the distance (in mm) of the imaging plane from the intersection of the ray with the optical axis 101. It can be known from the longitudinal spherical aberration diagram that the convergent focus deviation degrees of the light rays with different wavelengths in the first embodiment tend to be consistent, and the diffuse speckle or the chromatic halo in the imaging picture is effectively suppressed. FIG. 2 also includes a Field curvature map (statistical Field Curves) of optical system 10, where the S curve represents sagittal Field curvature at 546nm and the T curve represents meridional Field curvature at 546 nm. As can be seen from the figure, the meridional and sagittal curvature field of the system is small, the maximum curvature field is controlled within 0.05mm, and the distance between the meridional curvature field and the sagittal curvature field in each field is small, so that the curvature field and astigmatism of each field are well corrected, the imaging curvature is not obvious, and the center and the edge of each field can have clear imaging. Fig. 2 also includes a Distortion map (Distortion) of the optical system 10, and it can be seen that the image Distortion caused by the main beam is small and the imaging quality of the system is excellent.

Second embodiment

Referring to fig. 3 and 4, the second embodiment provides an optical system 10 with a six-piece structure, the optical system 10 includes, in order from an object side to an image side along an optical axis 101, a first lens element L1 with negative refractive power, a second lens element L2 with negative refractive power, a stop STO, a third lens element L3 with positive refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with negative refractive power, and a sixth lens element L6 with positive refractive power. Fig. 4 includes a longitudinal spherical aberration diagram, an astigmatism diagram, and a distortion diagram of the optical system 10 in this embodiment, wherein the reference wavelength of the astigmatism diagram and the distortion diagram is 546 nm.

The fourth lens L4 and the fifth lens L5 constitute a cemented lens.

The lens parameters of the optical system 10 in the second embodiment are shown in tables 3 and 4, wherein the definitions of the structures and parameters can be obtained from the first embodiment, which are not repeated herein.

TABLE 3

TABLE 4

Number of noodles

3

4

6

7

11

12

K

-2.310E+00

-2.349E-01

2.125E+00

3.512E+00

1.050E+00

-3.416E+01

A4

-1.057E-03

4.336E-03

2.083E-04

-2.846E-04

5.241E-05

1.400E-03

A6

2.090E-04

-2.974E-04

-3.004E-04

2.198E-05

2.619E-05

4.108E-05

A8

-2.854E-05

7.438E-05

4.768E-05

-6.325E-06

-1.974E-06

-1.161E-06

A10

4.309E-06

-1.339E-06

-5.402E-06

7.238E-08

2.107E-07

6.230E-07

A12

-4.804E-07

4.923E-07

4.276E-07

6.519E-10

-7.328E-08

-9.188E-08

A14

3.368E-08

-3.299E-08

-2.292E-08

-3.742E-10

5.778E-09

7.122E-09

A16

-1.396E-09

1.468E-09

5.879E-10

2.372E-11

-2.646E-10

-2.974E-10

A18

3.050E-11

-3.814E-11

-1.562E-11

-6.566E-13

6.546E-12

5.911E-12

A20

-2.577E-13

4.333E-13

1.355E-13

7.030E-15

-7.029E-14

-4.332E-14

The camera module 10 in this embodiment satisfies the following relationship:

FOV/EPD(deg/mm)	19.725	f3/f	1.798
				f1/CT1	-10.087	fx/f	3.046
(R1+R2)/(R1-R2)	1.463	CT2/\|Sags3\|	0.575
				f2/f	-8.292	TTL/f	4.676

where fx is a combined focal length of the fourth lens L4, the fifth lens L5, and the sixth lens L6.

As can be seen from the aberration diagrams in fig. 4, the longitudinal spherical aberration, curvature of field, astigmatism, and distortion of the optical system 10 are all well controlled, thereby illustrating that the optical system 10 of this embodiment has good imaging quality.

Third embodiment

Referring to fig. 5 and 6, the third embodiment provides an optical system 10 with a seven-piece structure, the optical system 10 includes, in order from an object side to an image side along an optical axis 101, a first lens element L1 with negative refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a stop STO, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with positive refractive power, a sixth lens element L6 with negative refractive power, and a seventh lens element L7 with positive refractive power. Fig. 6 includes a longitudinal spherical aberration diagram, an astigmatism diagram, and a distortion diagram of the optical system 10 in this embodiment, wherein the reference wavelength of the astigmatism diagram and the distortion diagram is 546 nm.

The object-side surface S3 of the second lens element L2 is concave, and the image-side surface S4 is concave.

The object-side surface S7 of the fourth lens element L4 is convex, and the image-side surface S8 is concave.

The object-side surface S9 of the fifth lens element L5 is convex, and the image-side surface S10 is convex.

The object-side surface S11 of the sixth lens element L6 is concave, and the image-side surface S12 is concave.

The object-side surface S13 of the seventh lens element L7 is convex, and the image-side surface S14 is convex.

The second lens L2 and the third lens L3 constitute a cemented lens, and the fifth lens L5, the sixth lens L6, and the seventh lens L7 constitute a cemented lens.

The lens parameters of the optical system 10 in the third embodiment are shown in tables 5 and 6, wherein the definitions of the structures and parameters can be obtained from the first embodiment, which are not repeated herein.

TABLE 5

TABLE 6

The camera module 10 in this embodiment satisfies the following relationship:

FOV/EPD(deg/mm)	19.194	f3/f	1.464
				f1/CT1	-8.280	fx/f	1.713
(R1+R2)/(R1-R2)	3.686	CT2/\|Sags3\|	4.811
				f2/f	-1.475	TTL/f	5.208

wherein fx is a combined focal length of the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7.

As can be seen from the aberration diagrams in fig. 6, the longitudinal spherical aberration, curvature of field, astigmatism, and distortion of the optical system 10 are all well controlled, thereby illustrating that the optical system 10 of this embodiment has good imaging quality.

Fourth embodiment

Referring to fig. 7 and 8, the fourth embodiment provides an optical system 10 with a seven-piece structure, and the optical system 10 includes, in order from an object side to an image side along an optical axis 101, a first lens element L1 with negative refractive power, a second lens element L2 with negative refractive power, a stop STO, a third lens element L3 with positive refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with positive refractive power, a sixth lens element L6 with negative refractive power, and a seventh lens element L7 with positive refractive power. Fig. 8 includes a longitudinal spherical aberration diagram, an astigmatism diagram, and a distortion diagram of the optical system 10 in this embodiment, where the reference wavelength of the astigmatism diagram and the distortion diagram is 546 nm.

The object-side surface S5 of the third lens element L3 is convex, and the image-side surface S6 is concave.

The object-side surface S13 of the seventh lens element L7 is convex, and the image-side surface S14 is concave.

The fifth lens L5 and the sixth lens L6 constitute a cemented lens.

The lens parameters of the optical system 10 in the fourth embodiment are shown in tables 7 and 8, wherein the definitions of the structures and parameters can be obtained from the first embodiment, which is not repeated herein.

TABLE 7

TABLE 8

Number of noodles

3

4

8

9

13

14

K

-2.317E+00

-3.872E-01

2.503E+00

1.716E+00

3.881E+00

2.942E+00

A4

-4.945E-05

3.800E-03

1.960E-04

3.512E-04

3.824E-04

0.000E+00

A6

1.564E-04

-2.933E-05

-2.920E-05

2.068E-06

-2.191E-05

-3.249E-09

A8

-3.693E-05

-1.802E-06

1.905E-06

-1.143E-07

-1.811E-07

0.000E+00

A10

4.542E-06

1.145E-06

-1.059E-08

4.290E-09

-2.662E-09

0.000E+00

A12

-3.271E-07

-7.075E-08

2.583E-09

-1.464E-10

2.994E-11

0.000E+00

A14

1.281E-08

2.223E-09

-4.085E-11

1.531E-12

-2.616E-13

0.000E+00

A16

-2.089E-10

-2.829E-11

2.533E-13

-4.527E-14

6.405E-14

0.000E+00

A18

0.000E+00

A20

0.000E+00

The camera module 10 in this embodiment satisfies the following relationship:

FOV/EPD(deg/mm)	17.675	f3/f	5.986
				f1/CT1	-9.863	fx/f	1.099
(R1+R2)/(R1-R2)	1.215	CT2/\|Sags3\|	0.667
				f2/f	-2.329	TTL/f	4.813

As can be seen from the aberration diagrams in fig. 8, the longitudinal spherical aberration, curvature of field, astigmatism, and distortion of the optical system 10 are all well controlled, thereby illustrating that the optical system 10 of this embodiment has good imaging quality.

Fifth embodiment

Referring to fig. 9 and 10, the fifth embodiment provides an optical system 10 with a six-piece structure, and the optical system 10 includes, in order from an object side to an image side along an optical axis 101, a first lens element L1 with negative refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with negative refractive power, and a sixth lens element L6 with positive refractive power. Fig. 10 includes a longitudinal spherical aberration diagram, an astigmatism diagram, and a distortion diagram of the optical system 10 in this embodiment, where the reference wavelength of the astigmatism diagram and the distortion diagram is 546 nm.

The fourth lens L4, the fifth lens L5, and the sixth lens L6 constitute a cemented lens.

The lens parameters of the optical system 10 in the fifth embodiment are shown in tables 9 and 10, wherein the definitions of the structures and parameters can be obtained from the first embodiment, which are not described herein.

TABLE 9

Watch 10

Number of noodles	3	4	5	6	7
						K	-3.087E+00	-1.149E-01	-3.265E+00	3.229E+00	2.027E+00
A4	-2.075E-04	1.931E-03	-1.972E-04	-2.265E-04	0.000E+00
						A6	3.251E-05	-1.322E-05	2.134E-06	3.248E-05	0.000E+00
A8	-1.328E-06	1.160E-06	3.272E-07	-5.732E-07	0.000E+00
						A10	1.653E-07	0.000E+00	-2.372E-10	-1.426E-09	0.000E+00
A12	-6.249E-09	0.000E+00	0.000E+00	1.639E-09	0.000E+00
						A14	0.000E+00	0.000E+00	0.000E+00	-1.818E-10	0.000E+00
A16	0.000E+00	0.000E+00	0.000E+00	2.870E-12	0.000E+00
						A18	0.000E+00	0.000E+00	0.000E+00	0.000E+00	0.000E+00
A20	0.000E+00	0.000E+00	0.000E+00	0.000E+00	0.000E+00

The camera module 10 in this embodiment satisfies the following relationship:

FOV/EPD(deg/mm)	19.405	f3/f	1.605
				f1/CT1	-11.303	fx/f	2.672
(R1+R2)/(R1-R2)	2.529	CT2/\|Sags3\|	1.681
				f2/f	-3.108	TTL/f	4.822

As can be seen from the aberration diagrams in fig. 10, the longitudinal spherical aberration, curvature of field, astigmatism, and distortion of the optical system 10 are all well controlled, thereby illustrating that the optical system 10 of this embodiment has good imaging quality.

Referring to fig. 11, in an embodiment provided herein, the optical system 10 is assembled with an image sensor 210 to form the image module 20, and the image sensor 210 is disposed at an image side of the optical system 10. The image sensor 210 may be a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor). In general, when assembling, the image forming surfaces S15 of the optical system 10 are overlapped with the light sensing surfaces of the image sensor 210, the shape of the effective pixel area on the light sensing surfaces is generally rectangular, and the maximum angle of view corresponding to the diagonal direction of the rectangular effective pixel area is the maximum angle of view of the optical system 10. By adopting the optical system 10, the camera module 20 has the characteristics of large field of view, large aperture and large depth of field, i.e. can realize clear imaging for the close shot and the long shot within the large field of view, thereby obtaining more images and more depth information in a wider range.

In some embodiments, the camera module 20 includes an ir-cut filter 110 disposed between the optical system 10 and the image sensor 210, and the ir-cut filter 110 is used for filtering infrared light. In some embodiments, the camera module 20 further includes a protective glass 120, the protective glass 120 is disposed between the infrared cut filter 110 and the image sensor 210, and the protective glass 120 is used for protecting the image sensor 210.

Referring to fig. 12, some embodiments of the present application further provide an electronic device 30, and the camera module 20 is applied to the electronic device 30 to enable the electronic device 30 to have a camera function. Specifically, the electronic device 30 includes a fixing member 310, the camera module 20 is mounted on the fixing member 310, and the fixing member 310 may be a circuit board, a middle frame, a protective casing, or the like. The electronic device 30 includes, but is not limited to, an onboard camera device, an aircraft camera device, a surveillance camera device, and other camera devices that have high requirements for large field of view and depth information.

In some embodiments, the electronic device 30 is a vehicle-mounted camera device (the specific structure can refer to fig. 12), and the camera module 20 is disposed in the fixing member 310 of the vehicle-mounted camera device. In some embodiments, the camera module 20 further includes a mounting plate 320, the fixing member 310 is rotatably connected to the mounting plate 320, and the mounting plate 320 is configured to be fixed to the vehicle body. The electronic device 30 may cooperate with at least one of an assistant driving system, an automatic driving system, and a display screen to transmit the obtained image information to an analysis system to determine the road condition, or directly display the image on the display screen. By using the camera module 20 to obtain a wider range of images and more depth information, the accuracy of the driver's judgment of the road conditions can be improved, and the driving safety can be improved.

Referring to fig. 13, some embodiments of the present application further provide a vehicle 40, where vehicle 40 may be a manned or manned device such as an automobile or an aircraft. The carrier 40 includes a mounting portion 410 and the electronic apparatus 30, and the electronic apparatus 30 is disposed on the mounting portion. Specifically, when vehicle 40 is an automobile, mounting portion 410 may be a front grille, a rear view mirror, a left rear view mirror, a right rear view mirror, a roof, a trunk lid, or other body portion suitable for mounting an image pickup apparatus. The carrier 40 can obtain a wider field of view through the electronic device 30, and at the same time, can better capture the detailed information of the road conditions at near and far locations, and can maintain good imaging quality. Therefore, vehicle 40 can obtain clearer and more accurate road condition information, so that a driver or an auxiliary driving system or an automatic driving system can make a judgment in time to avoid obstacles, thereby being beneficial to improving driving safety.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. An optical system comprising, in order from an object side to an image side along an optical axis:

a first lens element with negative refractive power;

a fifth lens element with refractive power;

the optical system satisfies the relationship:

17.5deg/mm＜FOV/EPD＜20deg/mm；

2. The optical system of claim 1, further comprising a seventh lens element with positive refractive power disposed image-wise of the sixth lens element, an object-side surface of the seventh lens element being convex at a paraxial region thereof.

3. An optical system according to claim 1 or 2, characterized in that the optical system satisfies the relation:

-12.5＜f1/CT1＜-8；

f1 is the effective focal length of the first lens, and CT1 is the thickness of the first lens on the optical axis.

4. An optical system according to claim 1 or 2, characterized in that the optical system satisfies the relation:

1＜(R1+R2)/(R1-R2)＜4；

r1 is a radius of curvature of an object-side surface of the first lens at an optical axis, and R2 is a radius of curvature of an image-side surface of the first lens at the optical axis.

5. An optical system according to claim 1 or 2, characterized in that the optical system satisfies the relation:

-8.5＜f2/f＜-1.3；

f2 is the effective focal length of the second lens, and f is the effective focal length of the optical system.

6. An optical system according to claim 1 or 2, characterized in that the optical system satisfies the relation:

1＜f3/f＜6；

f3 is the effective focal length of the third lens, and f is the effective focal length of the optical system.

7. An optical system according to claim 1 or 2, characterized in that the optical system satisfies the relation:

1＜fx/f＜3.5；

fx is an effective focal length of a lens group formed by the fourth lens and the lens closest to the image side in the optical system, and f is the effective focal length of the optical system.

8. An optical system according to claim 1 or 2, characterized in that the optical system satisfies the relation:

0.5＜CT2/|Sags3|＜5；

CT2 is the thickness of the second lens on the optical axis, and Sags3 is the sagittal height of the object-side surface of the third lens at the maximum effective aperture.

9. An optical system according to claim 1 or 2, characterized in that the optical system satisfies the relation:

4.5＜TTL/f＜5.5；

TTL is a distance on an optical axis from an object-side surface of the first lens element to an imaging surface of the optical system, and f is an effective focal length of the optical system.

10. A camera module comprising an image sensor and the optical system of any one of claims 1 to 9, wherein the image sensor is disposed on an image side of the optical system.

11. An electronic device, comprising a fixing member and the camera module set according to claim 10, wherein the camera module set is disposed on the fixing member.

12. A carrier comprising a mounting portion and the electronic device of claim 11, wherein the electronic device is disposed on the mounting portion.