Optical system, lens module and electronic device

Abstract

The application provides an optical system, a lens module and an electronic device, which sequentially comprises, along the direction of an optical axis from an object side to an image side: a first lens with positive refractive power; a second lens with negative refractive power; a third lens, a fourth lens, a fifth lens and a sixth lens with refractive power; and a seventh lens with negative refractive power; the optical system further comprises a diaphragm, and the optical system satisfies a condition formula: 1.5 < TTL / D < 2.5. The surface shape and the refractive power of each lens of the first lens to the seventh lens are reasonably set, so that the optical system meets the requirements of miniaturization, high-quality feeling, high definition and the ability to shoot in a dark environment. At the same time, the appropriate proportion of TTL / D is set to ensure the miniaturization design of the lens and provide the required light quantity for shooting, realize the shooting effect of high-quality and high definition, and ensure sufficient light quantity for shooting scenes of objects with small light intensity, such as night scenes and starry sky scenes.

Description

Technical Field

[0001] The present invention belongs to the field of optical imaging technology, and in particular relates to an optical system, a lens module and an electronic device. Background Art

[0002] With the widespread use of electronic products such as mobile phones, tablets, drones, and computers, a variety of technological advancements are constantly being introduced. Among these new electronic products, improvements and innovations in camera lens performance have become a major focus and a key component of technological advancement. The ability to capture high-quality, high-definition images using miniature camera components, even in low-light conditions, has become a key factor in modern consumer electronic product choices. Furthermore, technological advancements have led to performance improvements in photosensitive components such as CCDs and CMOS sensors, enabling the capture of high-quality images and videos, providing a higher-quality photography experience. Therefore, miniaturization and performance improvements in optical system design have become key factors in improving camera quality. Summary of the Invention

[0003] The purpose of the present invention is to provide an optical system, a lens module and an electronic device that meet the requirements of miniaturization, high image quality, high definition and the ability to shoot in low-light environments.

[0004] To achieve the purpose of the present invention, the present invention provides the following technical solutions:

[0005] In a first aspect, the present invention provides an optical system, which sequentially includes, from the object side to the image side along the optical axis direction: a first lens, having a positive refractive power, the object side surface of the first lens being convex, and the image side surface of the first lens at the optical axis being concave; a second lens, having a negative refractive power, the object side surface of the second lens being convex, and the image side surface being concave; a third lens, having a refractive power, the object side surface of the third lens at the optical axis being convex, and the image side surface of the third lens at the optical axis being concave; a fourth lens, having a refractive power, the object side surface of the fourth lens at the circumference being concave, and the image side surface of the fourth lens at the circumference being convex; a fifth lens, having a refractive power, the object side surface of the fifth lens at the optical axis being convex, and the image side surface of the fifth lens at the optical axis being concave; a sixth lens, having a refractive power, the object side surface of the sixth lens at the circumference being concave, and the image side surface of the sixth lens at the circumference being convex; a seventh lens, having a negative refractive power, the image side surface of the seventh lens at the optical axis being concave, and the image side surface of the seventh lens at the circumference being convex; the optical system further includes an aperture, and the optical system satisfies the conditional formula: 1.5 < TTL / D < 2.5; where TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface of the optical system; D is the aperture size of the aperture. By reasonably setting the surface types and refractive powers of each lens from the first lens to the seventh lens, it is ensured that the optical system meets the requirements of miniaturization, high picture quality, high definition, and the ability to take pictures in low-light environments. At the same time, setting an appropriate ratio of TTL / D ensures the miniaturized design of the lens and provides the light transmission amount required for lens shooting, achieving a high picture quality and high-definition shooting effect, and ensuring sufficient light transmission amount for shooting object space scenes with low light brightness such as night scenes and starry skies.

[0006] In a possible implementation manner, the optical system satisfies the conditional formula: 0.6 < L / Imgh < 0.8; where L is the aperture diameter of the first lens, and Imgh is half of the diagonal length of the effective pixel area of the imaging surface of the optical system. The aperture diameter of the first lens determines the light transmission amount of the entire optical system, and the size of the photosensitive surface determines the picture clarity and pixel size of the entire optical system. Setting a reasonable combination of the two ensures sufficient light transmission amount, ensures the clarity of the captured image, and meets the requirements for shooting high-quality night scenes, starry skies and other object space scenes with low light brightness.

[0007] In a possible implementation manner, the optical system satisfies the conditional formula: 1 < f14 / f < 1.5; where f14 is the combined focal length of the first lens, the second lens, the third lens and the fourth lens, and f is the effective focal length of the optical system. The first lens to the fourth lens mainly corrects distortion and reasonably expands the light incident angle, meets the image height requirements, and forms a reasonable ratio with the optical effective focal length to meet the requirements of the optical system.

[0008] In a possible implementation, the optical system satisfies the conditional formula: Fno < 2; where Fno is the f-number of the optical system. When Fno < 2, it can meet the miniaturization requirement while ensuring a large aperture under a certain focal length, allowing the optical system to have sufficient light input, making the captured image clearer, and enabling the capture of object space scenes with low light brightness such as high-quality night scenes and starry skies.

[0009] In a possible implementation, the optical system satisfies the conditional formula: Fno / TTL < 0.29; where Fno is the f-number of the optical system. Meeting this conditional formula can simultaneously take into account the requirements of a large aperture and miniaturization design of the lens system, provide sufficient light transmission for camera shooting, meet the needs of high-quality and high-clarity shooting, and can provide high-quality shooting requirements for object space scenes with low light brightness such as night scenes and starry skies.

[0010] In a possible implementation, the optical system satisfies the conditional formula: TTL / Imgh < 1.5; where Imgh is half of the diagonal length of the effective pixel area of the imaging surface of the optical system. It can meet the miniaturization requirement while the imaging surface has a large image height information to meet the requirements of shooting image quality clarity.

[0011] In a possible implementation, the optical system satisfies the conditional formula: 1.0 < TTL / f < 1.3; where f is the effective focal length of the optical system. While meeting the high-clarity optical performance, a focal length matching the structure is required to meet the miniaturization requirement.

[0012] In a possible implementation, the optical system satisfies the conditional formula: 1.0 < f / f1 < 1.3; where f1 is the effective focal length of the first lens and f is the effective focal length of the optical system. The first lens provides all the optical information of the lens group from the object space to the image space. The aperture size and focal length of the first lens determine the acquisition of light information of the optical system for the object space. When the above conditional formula is satisfied, the focal length ratio of the first lens to the optical system is appropriate, which can correct the aberration generated by the first lens and has a simple processing technology.

[0013] In a possible implementation, the optical system satisfies the conditional formula: 0.2 < (R9 + R10) / (R9 * R10) < 0.65; where R9 is the curvature radius of the object side of the fifth lens and R10 is the curvature radius of the image side of the fifth lens. When the lens group satisfies the above conditional formula, the curvature radii of the object side and the image side of the fifth lens are relatively appropriate, which can ensure the processability of the shape of the fifth lens and effectively improve the astigmatism of the optical system.

[0014] In a possible implementation, the optical system satisfies the conditional formula: 2 < (R1 + R2) / f1 < 4.5; where, R1 is the radius of curvature of the object side surface of the first lens, R2 is the radius of curvature of the image side surface of the first lens, and f1 is the effective focal length of the first lens. It can meet the large aperture requirement of the first lens and facilitate the correction of aberrations.

[0015] In a possible implementation, the optical system satisfies the conditional formula: 1.5 < R3 / R4 < 3.5; where, R3 is the radius of curvature of the object side surface of the second lens, and R4 is the radius of curvature of the image side surface of the second lens. The second lens provides negative refractive power to balance the distortion generated by the first lens and corrects the aberration generated by the first lens to a certain extent.

[0016] In a possible implementation, the optical system satisfies the conditional formula: -100 < (R5 + R6) / (R5 - R6) < 180; where, R5 is the radius of curvature of the object side surface of the third lens, and R6 is the radius of curvature of the image side surface of the third lens. The radius of curvature of the object side surface and the image side surface of the third lens are relatively appropriate, which can reasonably increase the incident angle to meet the image height requirement of the optical system, while reducing the sensitivity of the optical system and improving the assembly stability.

[0017] In a possible implementation, the optical system satisfies the conditional formula: -0.6 < f1 / f2 < -0.3; where, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens. The first lens provides positive refractive power, and the second lens provides negative refractive power. The two lenses are configured reasonably to correct the longitudinal chromatic aberration of the optical system.

[0018] In a possible implementation, the optical system satisfies the conditional formula: 1.5 < (R13 * R14) / (R13 - R14) < 3.5; where, R13 is the radius of curvature of the object side surface of the seventh lens, and R14 is the radius of curvature of the image side surface of the seventh lens. The radius of curvature of the object side surface and the image side surface of the seventh lens are relatively appropriate, which can reasonably correct the spherical aberration of the optical system, improve the distortion aberration and astigmatism, while reducing the system sensitivity and improving the assembly stability.

[0019] In a possible implementation, the optical system satisfies the conditional formula: 0.5 < ΣCT / f < 0.7; where, ΣCT is the total central thickness of each lens of the optical system at the optical axis, and f is the effective focal length of the optical system. It can ensure a compact structural combination of the lens group and the corresponding effective focal length to meet the miniaturization requirement.

[0020] In a possible implementation, the optical system satisfies the conditional formula: 0.4 < ΣCT / TTL < 0.6; where ΣCT is the total central thickness of each lens of the optical system at the optical axis. This can ensure good assembly stability of the lens group and meet the requirements of the miniaturized design of the system.

[0021] In a possible implementation, the optical system satisfies the conditional formula: 0.25 < ET1 / CT1 < 0.55; where ET1 is the edge thickness of the first lens and CT1 is the central thickness of the first lens. This can obtain a relatively ideal optical system and meet the requirements of taking high-quality pictures.

[0022] In a possible implementation, the optical system satisfies the conditional formula: 1.0 < ET5 / CT5 < 1.6; where ET5 is the edge thickness of the fifth lens and CT5 is the central thickness of the fifth lens. The fifth lens is an aspherical lens, and the processing difficulty is relatively high. The ratio of the edge thickness to the central thickness should not be too large. When 1.0 < ET5 / CT5 < 1.6, good optical performance and molding yield can be ensured.

[0023] In a second aspect, the present invention provides a lens module, including a lens barrel and the optical system according to any one of the various implementations in the first aspect. The first lens to the seventh lens of the optical system are installed in the lens barrel. By installing each lens of the optical system, the lens module has the characteristics of miniaturization, high picture quality, high definition, and the ability to take pictures in low-light environments.

[0024] In a third aspect, the present invention provides an electronic device, including a housing, an electronic photosensitive element, and the lens module provided in the second aspect. The lens module and the electronic photosensitive element are provided in the housing. The electronic photosensitive element is provided on the imaging surface of the optical system and is used to convert the light of the object incident on the electronic photosensitive element through the first lens to the seventh lens into an electrical signal of an image. By setting the lens module of the present invention, the electronic device can achieve thin, light, and miniaturized design and can perform high-quality, high-definition shooting in low-light environments. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1a It is a schematic structural diagram of the optical system of the first embodiment;

[0027] Figure 1b 1. The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the first embodiment;

[0028] Figure 2a is a schematic structural diagram of the optical system of the second embodiment;

[0029] Figure 2b 1 and 2 are the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the second embodiment;

[0030] Figure 3a is a schematic structural diagram of an optical system according to a third embodiment;

[0031] Figure 3b 1 and 2 are the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the third embodiment;

[0032] Figure 4a is a schematic structural diagram of an optical system according to a fourth embodiment;

[0033] Figure 4b 1 and 2 are the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the fourth embodiment;

[0034] Figure 5a is a schematic structural diagram of the optical system of the fifth embodiment;

[0035] Figure 5b 1 and 2 are the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the fifth embodiment;

[0036] Figure 6a is a schematic structural diagram of the optical system of the sixth embodiment;

[0037] Figure 6b 1 and 2 are the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the sixth embodiment;

[0038] Figure 7a is a schematic structural diagram of the optical system of the seventh embodiment;

[0039] Figure 7b 1. longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the seventh embodiment;

[0040] Figure 8a is a schematic structural diagram of the optical system of an eighth embodiment;

[0041] Figure 8b 1. are the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the eighth embodiment;

[0042] Figure 9a is a schematic structural diagram of the optical system of a ninth embodiment;

[0043] Figure 9b1. are the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the ninth embodiment;

[0044] Figure 10a is a schematic structural diagram of the optical system of the tenth embodiment;

[0045] Figure 10b 10. FIG. 11 is a longitudinal spherical aberration curve, an astigmatism curve, and a distortion curve of the tenth embodiment;

[0046] Figure 11a is a schematic structural diagram of the optical system of the eleventh embodiment;

[0047] Figure 11b 11. are the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the eleventh embodiment;

[0048] Figure 12a is a schematic structural diagram of an optical system according to a twelfth embodiment;

[0049] Figure 12b 11. These are the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the twelfth embodiment. DETAILED DESCRIPTION

[0050] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0051] An embodiment of the present invention provides a lens module comprising a lens barrel and an optical system according to an embodiment of the present invention, wherein the first through seventh lenses of the optical system are mounted within the lens barrel. The lens module can be a standalone lens for a digital camera or an imaging module integrated into an electronic device such as a smartphone. By installing the lenses of the optical system, the lens module achieves miniaturization, high image quality, high definition, and the ability to shoot in low-light environments.

[0052] An embodiment of the present invention further provides an electronic device, comprising a housing, an electronic photosensitive element, and a lens module provided by an embodiment of the present invention, wherein the lens module and the electronic photosensitive element are arranged in the housing, and the electronic photosensitive element is arranged on the imaging surface of the optical system, and is used to convert the light of an object that passes through the first lens to the seventh lens and is incident on the electronic photosensitive element into an electrical signal of an image. The electronic photosensitive element can be a complementary metal oxide semiconductor (CMOS) or a charge-coupled device (CCD). The electronic device can be a smart phone, a personal digital assistant (PDA), a tablet computer, a smart watch, a drone, etc. By providing the lens module of the present invention, the electronic device can be made thin and lightweight, and can perform high-quality, high-definition shooting in a dark environment.

[0053] An embodiment of the present invention provides an optical system comprising, for example, seven lenses: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. The first through seventh lenses are arranged sequentially from the object side to the image side along the optical axis. Any two adjacent lenses may have an air gap between them.

[0054] Specifically, the specific shape and structure of the seven lenses are as follows:

[0055] The first lens has positive refractive power, the object-side surface of the first lens is convex, and the image-side surface of the first lens at the optical axis is concave. The second lens has negative refractive power, the object-side surface of the second lens is convex, and the image-side surface of the third lens is concave. The third lens has positive or negative refractive power, the object-side surface of the third lens at the optical axis is convex, and the image-side surface of the third lens at the optical axis is concave. The fourth lens has positive or negative refractive power, the object-side surface of the fourth lens at the circumference is concave, and the image-side surface of the fourth lens at the circumference is convex. The fifth lens has positive or negative refractive power, the object-side surface of the fifth lens at the optical axis is convex, and the image-side surface of the fifth lens at the optical axis is concave. The sixth lens has positive or negative refractive power, the object-side surface of the sixth lens at the circumference is concave, and the image-side surface of the sixth lens at the circumference is convex. The seventh lens has negative refractive power, the image-side surface of the seventh lens at the optical axis is concave, and the image-side surface of the seventh lens at the circumference is convex.

[0056] The optical system further includes a stop. The stop can be set at any position between the first lens to the seventh lens, such as between the second lens and the third lens.

[0057] The optical system satisfies the conditional formula: 1.5 < TTL / D < 2.5; where TTL is the distance from the object side of the first lens to the imaging surface of the optical system on the optical axis; D is the size of the aperture of the optical system diaphragm.

[0058] The surface shapes and refractive powers of the lenses from the first lens to the seventh lens are reasonably set to ensure that the optical system meets the requirements of miniaturization, high picture quality, high definition, and the ability to take pictures in low-light environments. At the same time, a suitable ratio of TTL / D is set to ensure the miniaturized design of the lens and provide the light transmission amount required for lens shooting, achieving a high-quality and high-definition shooting effect, and ensuring sufficient light transmission amount for object space scenes with low light brightness such as night scenes and starry skies. If TTL / D < 1.5, when meeting the miniaturized design, the aperture diameter will be too large, causing marginal light to enter the imaging system and reducing the imaging quality. If TTL / D > 2.5, while meeting the miniaturization, the aperture diameter of the diaphragm will be too small to meet the light transmission amount of the system and cannot achieve the high-definition shooting requirements for low-light scenes. Therefore, only when 1.5 < TTL / D < 2.5 can the optimization of optical performance and the miniaturization of the structure be兼顾 simultaneously.

[0059] In one embodiment, the optical system satisfies the conditional formula: 0.6 < L / Imgh < 0.8; where L is the aperture diameter of the first lens, and Imgh is half of the diagonal length of the effective pixel area of the electronic photosensitive element (such as CMOS, CCD, the same below) on the imaging surface of the optical system. The aperture diameter of the first lens determines the light transmission amount of the entire optical system, and the size of the photosensitive surface determines the picture clarity and pixel size of the entire optical system. A reasonable combination of the two is set to ensure sufficient light transmission amount, ensure the clarity of the captured image, and meet the requirements for shooting high-quality night scenes, starry skies and other object space scenes with low light brightness. If L / Imgh > 0.8, it will cause overexposure and too high light brightness, affecting the picture quality. If L / Imgh < 0.6, it will cause insufficient light transmission amount and cannot achieve dark scene shooting.

[0060] In one embodiment, the optical system satisfies the conditional formula: 1 < f14 / f < 1.5; where f14 is the combined focal length of the first lens, the second lens, the third lens and the fourth lens, and f is the effective focal length of the optical system. The first lens to the fourth lens mainly correct aberrations and reasonably expand the light incident angle to meet the image height requirements, and form a reasonable ratio with the optical effective focal length to meet the requirements of the optical system. If f14 / f < 1, the system image height requirements cannot be met. If f14 / f > 1.5, the system aberration requirements cannot be met.

[0061] In one embodiment, the optical system satisfies the conditional formula: Fno < 2; where Fno is the f-number of the optical system. When Fno < 2, miniaturization can be achieved while ensuring a large aperture with a certain focal length, allowing the optical system to have sufficient light input, making the captured image clearer, and enabling the capture of high-quality night scenes, starry skies, and other object space scenes with low light brightness.

[0062] In one embodiment, the optical system satisfies the conditional formula: Fno / TTL < 0.29; where Fno is the f-number of the optical system. Satisfying this conditional formula can simultaneously meet the requirements of a large aperture and miniaturization design for the lens system, provide sufficient light transmission for camera shooting, meet the needs of high-quality and high-definition shooting, and provide high-quality shooting requirements for object space scenes with low light brightness such as night scenes and starry skies. When Fno / TTL > 0.29, the optical performance of the lens deteriorates and a high-definition shooting effect cannot be achieved.

[0063] In one embodiment, the optical system satisfies the conditional formula: TTL / Imgh < 1.5; where 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 Imgh is half of the diagonal length of the effective pixel area of the electronic photosensitive element on the imaging surface of the optical system. Satisfying the above relationship can, while achieving miniaturization, have a large image height information on the imaging surface to meet the requirements of shooting image quality clarity. If TTL / Imgh > 1.5, a high-definition imaging effect cannot be guaranteed while achieving miniaturization.

[0064] In one embodiment, the optical system satisfies the conditional formula: 1.0 < TTL / f < 1.3; where 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 f is the effective focal length of the optical system. While meeting the high-definition optical performance, a focal length matching the structure is required to meet the miniaturization requirements. If TTL / |f| ≤ 1.0, the optical length of the lens group is too short, resulting in increased system sensitivity and difficulty in aberration correction. When TTL / |f| ≥ 1.3, the optical length of the lens group is too long, resulting in too large an angle of the chief ray entering the imaging surface, and the marginal rays of the system imaging surface cannot be imaged on the photosensitive surface, resulting in incomplete imaging information.

[0065] In one embodiment, the optical system satisfies the conditional formula: 1.0 < f / f1 < 1.3; where f1 is the effective focal length of the first lens, and f is the effective focal length of the optical system. The first lens provides all the optical information of the lens group from the object space to the image space. The aperture size and focal length of the first lens determine the acquisition of light information in the object space by the optical system. When the above conditional formula is satisfied, the focal length ratio of the first lens to the optical system is appropriate, which can correct the phase difference generated by the first lens, and the processing technology is simple. When f / f1 ≥ 1.3, it will cause an increase in system sensitivity, difficult processing technology, and an increase in the difficulty of correcting the aberration generated by the first lens, making it difficult to meet the shooting requirements. When f / f1 ≤ 1.0, the focal length ratio of the first lens to the optical system is inappropriate, and the aberration generated by the first lens cannot be corrected.

[0066] In one embodiment, the optical system satisfies the conditional formula: 0.2 < (R9 + R10) / (R9 * R10) < 0.65; where R9 is the curvature radius of the object side of the fifth lens, and R10 is the curvature radius of the image side of the fifth lens. When the lens group satisfies the above conditional formula, the curvature radii of the object side and the image side of the fifth lens are relatively appropriate, which can ensure the processability of the shape of the fifth lens and effectively improve the astigmatism of the optical system.

[0067] In one embodiment, the optical system satisfies the conditional formula: 2 < (R1 + R2) / f1 < 4.5; where R1 is the curvature radius of the object side of the first lens, R2 is the curvature radius of the image side of the first lens, and f1 is the effective focal length of the first lens. The first lens provides all the optical information of the lens group from the object space to the image space. When 2 < (R1 + R2) / f1 < 4.5, it can meet the large aperture requirement of the first lens and facilitate the correction of the phase difference. If (R1 + R2) / f1 ≥ 4.5, it will increase the difficulty of correcting the phase difference of the optical system. If (R3 + R4) / f1 ≤ 2, it is not conducive to the optical system to acquire light information in the object space, and the imaging effect cannot reach the designed expected requirements.

[0068] In one embodiment, the optical system satisfies the conditional formula: 1.5 < R3 / R4 < 3.5; where R3 is the curvature radius of the object side of the second lens, and R4 is the curvature radius of the image side of the second lens. The second lens provides negative refractive power to balance the distortion generated by the first lens and corrects the aberration generated by the first lens to a certain extent. If R3 / R4 ≥ 3.5, it will cause excessive distortion correction; if R3 / R4 ≤ 1.5, the purpose of correcting the distortion cannot be achieved.

[0069] In one embodiment, the optical system satisfies the conditional formula: -100 < (R5 + R6) / (R5 - R6) < 180; where R5 is the curvature radius of the object side surface of the third lens, and R6 is the curvature radius of the image side surface of the third lens. When the third lens satisfies the above conditional formula, the curvature radii of the object side surface and the image side surface of the third lens are relatively appropriate, which can reasonably increase the incident angle to meet the image height requirement of the optical system, while reducing the sensitivity of the optical system and improving the assembly stability.

[0070] In one embodiment, the optical system satisfies the conditional formula: -0.6 < f1 / f2 < -0.3; where f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens. The first lens provides positive refractive power, and the second lens provides negative refractive power. The two lenses are configured reasonably to correct the lateral chromatic aberration of the optical system.

[0071] In one embodiment, the optical system satisfies the conditional formula: 1.5 < (R13 * R14) / (R13 - R14) < 3.5

[0072] where R13 is the curvature radius of the object side surface of the seventh lens, and R14 is the curvature radius of the image side surface of the seventh lens. When the optical system satisfies the above conditional formula, the curvature radii of the object side surface and the image side surface of the seventh lens are relatively appropriate, which can reasonably correct the spherical aberration of the optical system, improve the distortion aberration and astigmatism, while reducing the system sensitivity and improving the assembly stability.

[0073] In one embodiment, the optical system satisfies the conditional formula: 0.5 < ΣCT / f < 0.7; where ΣCT is the total sum of the central thicknesses of the lenses of the optical system at the optical axis, and f is the effective focal length of the optical system. When the optical system satisfies the above conditional formula, it can ensure a compact structural combination of the lens group and the corresponding effective focal length, meeting the miniaturization requirement.

[0074] In one embodiment, the optical system satisfies the conditional formula: 0.4 < ΣCT / TTL < 0.6; where ΣCT is the total sum of the central thicknesses of the lenses of the optical system at the optical axis, and TTL is the distance from the object side surface of the first lens to the imaging surface of the optical system on the optical axis. When the optical system satisfies the above conditional formula, it can ensure good assembly stability of the lens group and meet the requirement of the miniaturized design of the system.

[0075] In one embodiment, the optical system satisfies the conditional formula: 0.25 < ET1 / CT1 < 0.55; where ET1 is the edge thickness of the first lens and CT1 is the center thickness of the first lens. The first lens provides all the light information in the object space of the optical system, and at the same time, the corresponding aberrations, distortions, and field curvatures are also generated. Therefore, the ratio range of the edge thickness to the center thickness should not be too large. If it is too large, it will be difficult to correct the aberrations of the subsequent lens combination, and at the same time, a large distortion and a large field curvature will be generated, which cannot meet the optical performance requirements. When 0.25 < ET3 / CT3 < 0.55 is satisfied, a relatively ideal optical system can be obtained, meeting the requirements for taking high-quality pictures.

[0076] In one embodiment, the optical system satisfies the conditional formula: 1.0 < ET5 / CT5 < 1.6; where ET5 is the edge thickness of the fifth lens and CT5 is the center thickness of the fifth lens. The fifth lens is an aspherical lens, and the processing difficulty is relatively high. The ratio of the edge thickness to the center thickness should not be too large. When 1.0 < ET5 / CT5 < 1.6 is satisfied, good optical performance and molding yield can be ensured.

[0077] The first embodiment

[0078] Please refer to Figure 1a and Figure 1b , the optical system of this embodiment includes, in order from the object side to the image side along the optical axis direction:

[0079] The first lens L1, having a positive refractive power. The object side surface S1 of the first lens L1 is a convex surface, the image side surface S2 of the first lens L1 at the optical axis is a concave surface, and the image side surface S2 at the circumference is a convex surface;

[0080] The second lens L2, having a negative refractive power. The object side surface S3 of the second lens L2 is a convex surface, and the image side surface S4 is a concave surface;

[0081] The third lens L3, having a positive refractive power. The object side surface S5 of the third lens L3 is a convex surface, and the image side surface S6 of the third lens L3 is a concave surface;

[0082] The fourth lens L4, having a negative refractive power. The object side surface S7 of the fourth lens L4 is a concave surface, and the image side surface S8 of the fourth lens L4 is a convex surface;

[0083] The fifth lens L5, having a positive refractive power. The object side surface S9 of the fifth lens L5 at the optical axis is a convex surface, and the object side surface S9 at the circumference is a concave surface; the image side surface S10 of the fifth lens L5 at the optical axis is a concave surface, and the image side surface S10 at the circumference is a convex surface;

[0084] The sixth lens L6, having a positive refractive power. The object side surface S11 of the sixth lens L6 at the optical axis is a convex surface, and the object side surface S11 at the circumference is a concave surface; the image side surface S12 of the sixth lens L6 is a convex surface;

[0085] The seventh lens element L7 has negative refractive power. The object-side surface S13 of the seventh lens element L7 along the optical axis is concave, and the object-side surface S13 along the circumference is convex. The image-side surface S14 of the seventh lens element L7 along the optical axis is concave, and the image-side surface S14 along the circumference is convex.

[0086] The first lens L1 to the seventh lens L7 are all made of plastic.

[0087] In addition, the optical system also includes an aperture STO, an infrared cutoff filter L8 and an imaging surface S17. The aperture STO is arranged at the edge of the first lens L1 to control the amount of light entering. In other embodiments, the aperture STO can also be arranged between other adjacent lenses. The infrared cutoff filter L8 is arranged on the image side of the seventh lens L7, which includes an object side surface S15 and an image side surface S16. The infrared cutoff filter L8 is used to filter out infrared light so that the light entering the imaging surface S17 is visible light, and the wavelength of visible light is 380nm-780nm. The material of the infrared cutoff filter L8 is glass, and a film can be coated on the glass. The imaging surface S17 is the effective pixel area of ​​the electronic photosensitive element.

[0088] Table 1a shows a table of characteristics of the optical system of this embodiment, wherein the data are obtained using light with a wavelength of 555 nm, and the units of Y radius, thickness and focal length are all millimeters (mm).

[0089] Table 1a

[0090]

[0091] Among them, EFL is the effective focal length of the optical system, FNO is the aperture number of the optical system, and FOV is the field of view of the optical system.

[0092] In this embodiment, the object-side surface and the image-side surface of any lens from the first lens L1 to the seventh lens L7 are both aspherical surfaces. The surface shape x of each aspherical lens can be defined by, but is not limited to, the following aspherical surface formula:

[0093]

[0094] Where x is the distance vector from the vertex of the aspheric surface at a height h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the Y radius R in Table 1a above); k is the conic coefficient; Ai is the correction coefficient for the i-th order of the aspheric surface. Table 1b lists the higher-order coefficients A4, A6, A8, A10, A12, A14, A15, A17, and A18 that can be used for each aspheric mirror surface S1-S14 in the first embodiment.

[0095] Table 1b

[0096] Surface number K A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -0.4808 0.0035 0.0102 -0.0190 0.0240 -0.0189 0.0094 -0.0029 0.0005 0.0000 S2 4.4943 -0.0303 0.0434 -0.0350 -0.0018 0.0299 -0.0267 0.0112 -0.0023 0.0002 S3 -0.0448 -0.0344 0.0602 -0.0598 0.0247 0.0108 -0.0175 0.0082 -0.0017 0.0001 S4 -0.0014 -0.0171 0.0365 -0.0589 0.0821 -0.0886 0.0676 -0.0331 0.0092 -0.0011 S5 0.0000 -0.0499 0.0217 -0.0545 0.0848 -0.0931 0.0690 -0.0324 0.0088 -0.0010 S6 -4.2596 -0.0263 0.0071 -0.0082 -0.0018 0.0118 -0.0104 0.0042 -0.0007 0.0000 S7 2.0000 -0.0295 0.0294 -0.0723 0.1106 -0.1125 0.0728 -0.0288 0.0063 -0.0006 S8 -8.0000 -0.0558 0.0279 -0.0236 0.0136 -0.0052 0.0007 0.0002 -0.0001 0.0000 S9 -9.3403 -0.0471 0.0009 0.0018 0.0043 -0.0055 0.0026 -0.0007 0.0001 0.0000 S10 -2.5679 -0.0391 -0.0098 -0.0129 0.0170 -0.0083 0.0022 -0.0003 0.0000 0.0000 S11 -14.3812 0.0526 -0.0011 -0.0277 0.0175 -0.0061 0.0013 -0.0002 0.0000 0.0000 S12 -10.0207 0.0358 0.0299 -0.0258 0.0080 -0.0013 0.0001 0.0000 0.0000 0.0000 S13 -11.4058 0.0125 -0.0524 0.0278 -0.0070 0.0010 -0.0001 0.0000 0.0000 0.0000 S14 -0.9239 -0.0669 0.0081 0.0013 -0.0009 0.0002 0.0000 0.0000 0.0000 0.0000

[0097] Figure 1b The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the first embodiment are shown. Among them, the longitudinal spherical aberration curve represents the deviation of the focal point of light of different wavelengths after passing through each lens of the optical system; the astigmatism curve represents the meridional image curvature and sagittal image curvature; the distortion curve represents the distortion value corresponding to different field angles. Figure 1b It can be seen that the optical system provided in the first embodiment can achieve good imaging quality.

[0098] Second embodiment

[0099] Please refer to Figure 2a and Figure 2b The optical system of this embodiment includes, in order from the object side to the image side along the optical axis:

[0100] The first lens L1 has positive refractive power, the object-side surface S1 of the first lens L1 is convex, and the image-side surface S2 of the first lens L1 is concave;

[0101] The second lens L2 has negative refractive power, and its object-side surface S3 is convex, and its image-side surface S4 is concave;

[0102] The third lens L3 has positive refractive power. The object-side surface S5 of the third lens L3 along the optical axis is convex, the object-side surface S5 along the circumference is concave, and the image-side surface S6 of the third lens L3 is concave.

[0103] The fourth lens L4 has positive refractive power. The object-side surface S7 of the fourth lens L4 along the optical axis is convex, and the object-side surface S7 along the circumference is concave. The image-side surface S8 of the fourth lens L4 along the optical axis is concave, and the image-side surface S8 along the circumference is convex.

[0104] The fifth lens element L5 has positive refractive power. The object-side surface S9 of the fifth lens element L5 along the optical axis is convex, and the object-side surface S9 along the circumference is concave. The image-side surface S10 of the fifth lens element L5 is concave.

[0105] The sixth lens L6 has positive refractive power. The object-side surface S11 of the sixth lens L6 along the optical axis is convex, and the object-side surface S11 along the circumference is concave. The image-side surface S12 of the sixth lens L6 along the optical axis is concave, and the image-side surface S12 along the circumference is convex.

[0106] The seventh lens element L7 has negative refractive power. The object-side surface S13 of the seventh lens element L7 along the optical axis is convex, and the object-side surface S13 along the circumference is concave. The image-side surface S14 of the seventh lens element L7 along the optical axis is concave, and the image-side surface S14 along the circumference is convex.

[0107] The other structures of the second embodiment are the same as those of the first embodiment, and can be used as a reference.

[0108] Table 2a shows a table of characteristics of the optical system of this embodiment, wherein the data are obtained using light with a wavelength of 555 nm, and the units of Y radius, thickness and focal length are all millimeters (mm).

[0109] Table 2a

[0110]

[0111]

[0112] Among them, EFL is the effective focal length of the optical system, FNO is the aperture number of the optical system, and FOV is the field of view of the optical system.

[0113] Table 2b shows the high-order coefficients of various aspheric lenses that can be used in the second embodiment, wherein the various aspheric surface shapes can be defined by the formula given in the first embodiment.

[0114] Table 2b

[0115] Surface number K A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -0.4881 0.0054 0.0029 -0.0038 0.0046 -0.0035 0.0017 -0.0005 0.0001 0.0000 S2 4.9740 -0.0180 0.0132 -0.0076 0.0053 -0.0028 0.0005 0.0002 -0.0001 0.0000 S3 2.6114 -0.0270 0.0216 -0.0170 0.0161 -0.0104 0.0035 -0.0004 -0.0001 0.0000 S4 -1.9714 -0.0115 0.0159 -0.0165 0.0159 -0.0112 0.0056 -0.0024 0.0009 -0.0002 S5 0.0000 -0.0441 0.0022 0.0116 -0.0350 0.0472 -0.0356 0.0154 -0.0034 0.0003 S6 -2.6780 -0.0306 0.0005 0.0191 -0.0437 0.0563 -0.0422 0.0188 -0.0045 0.0004 S7 -13.7868 -0.0263 -0.0039 0.0034 -0.0102 0.0144 -0.0127 0.0067 -0.0020 0.0003 S8 9.7822 -0.0306 -0.0018 0.0020 -0.0060 0.0067 -0.0041 0.0014 -0.0003 0.0000 S9 -18.0000 -0.0132 0.0153 -0.0144 0.0070 -0.0025 0.0006 -0.0001 0.0000 0.0000 S10 -8.0000 -0.0705 0.0517 -0.0286 0.0110 -0.0031 0.0006 -0.0001 0.0000 0.0000 S11 -4.1192 -0.0123 0.0017 -0.0090 0.0047 -0.0014 0.0003 0.0000 0.0000 0.0000 S12 -6.2914 0.0409 -0.0297 0.0058 0.0000 -0.0003 0.0001 0.0000 0.0000 0.0000 S13 1.4115 -0.1419 0.0529 -0.0140 0.0027 -0.0003 0.0000 0.0000 0.0000 0.0000 S14 -1.1243 -0.1438 0.0569 -0.0173 0.0035 -0.0005 0.0000 0.0000 0.0000 0.0000

[0116] Figure 2b The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the second embodiment are shown. Among them, the longitudinal spherical aberration curve represents the deviation of the focal point of light of different wavelengths after passing through each lens of the optical system; the astigmatism curve represents the meridional image curvature and sagittal image curvature; the distortion curve represents the distortion value corresponding to different field angles. Figure 2b It can be seen that the optical system provided in the second embodiment can achieve good imaging quality.

[0117] Third embodiment

[0118] Please refer to Figure 3a and Figure 3b The optical system of this embodiment includes, in order from the object side to the image side along the optical axis:

[0119] The first lens L1 has positive refractive power, the object-side surface S1 of the first lens L1 is convex, and the image-side surface S2 of the first lens L1 is concave;

[0120] The second lens L2 has negative refractive power, the object-side surface S3 of the second lens L2 is convex, and the image-side surface S4 of the first lens L2 is concave;

[0121] The third lens L3 has positive refractive power, the object-side surface S5 of the third lens L3 is convex, and the image-side surface S6 of the third lens L3 is concave;

[0122] The fourth lens L4 has positive refractive power. The object-side surface S7 of the fourth lens L4 along the optical axis is convex, the object-side surface S7 along the circumference is concave, and the image-side surface S8 of the fourth lens L4 is convex.

[0123] The fifth lens element L5 has negative refractive power. The object-side surface S9 of the fifth lens element L5 along the optical axis is convex, and the object-side surface S9 along the circumference is concave. The image-side surface S10 of the fifth lens element L5 along the optical axis is concave, and the image-side surface S10 along the circumference is convex.

[0124] The sixth lens L6 has positive refractive power. The object-side surface S11 of the sixth lens L6 along the optical axis is convex, and the object-side surface S11 along the circumference is concave. The image-side surface S12 of the sixth lens L6 is convex.

[0125] The seventh lens element L7 has negative refractive power. The object-side surface S13 of the seventh lens element L7 along the optical axis is concave, and the object-side surface S13 along the circumference is convex. The image-side surface S14 of the seventh lens element L7 along the optical axis is concave, and the image-side surface S14 along the circumference is convex.

[0126] The other structures of the third embodiment are the same as those of the first embodiment, and can be used as a reference.

[0127] Table 3a shows a table of characteristics of the optical system of this embodiment, wherein the data are obtained using light with a wavelength of 555 nm, and the units of Y radius, thickness and focal length are all millimeters (mm).

[0128] Table 3a

[0129]

[0130]

[0131] Among them, EFL is the effective focal length of the optical system, FNO is the aperture number of the optical system, and FOV is the field of view of the optical system.

[0132] Table 3b shows the high-order coefficients of various aspheric lenses that can be used in the third embodiment, wherein the various aspheric surface shapes can be defined by the formula given in the first embodiment.

[0133] Table 3b

[0134] Surface number K A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -1.2516 0.0126 0.0020 -0.0010 0.0000 0.0009 -0.0008 0.0004 -0.0001 0.0000 S2 2.0556 -0.0142 0.0374 -0.0958 0.1266 -0.0976 0.0465 -0.0135 0.0022 -0.0002 S3 -7.9157 -0.0181 0.0513 -0.1200 0.1554 -0.1191 0.0564 -0.0162 0.0026 -0.0002 S4 -1.6796 -0.0108 0.0211 -0.0223 -0.0065 0.0424 -0.0482 0.0267 -0.0076 0.0009 S5 0.0000 -0.0392 0.0101 -0.0004 -0.0282 0.0485 -0.0425 0.0211 -0.0056 0.0006 S6 3.8042 -0.0365 0.0037 0.0119 -0.0340 0.0429 -0.0299 0.0120 -0.0024 0.0002 S7 2.0000 -0.0318 0.0212 -0.0608 0.0947 -0.0964 0.0621 -0.0243 0.0053 -0.0005 S8 -14.4936 -0.0383 0.0103 -0.0084 -0.0029 0.0087 -0.0069 0.0029 -0.0006 0.0001 S9 -4.1439 -0.0670 0.0457 -0.0331 0.0201 -0.0094 0.0029 -0.0006 0.0001 0.0000 S10 -9.7913 -0.0541 0.0305 -0.0226 0.0135 -0.0053 0.0013 -0.0002 0.0000 0.0000 S11 -1.8671 0.0112 -0.0023 -0.0080 0.0049 -0.0021 0.0006 -0.0001 0.0000 0.0000 S12 -13.3363 0.0683 -0.0258 0.0095 -0.0050 0.0017 -0.0003 0.0000 0.0000 0.0000 S13 2.7754 -0.0247 -0.0251 0.0210 -0.0066 0.0011 -0.0001 0.0000 0.0000 0.0000 S14 -0.6231 -0.1154 0.0362 -0.0095 0.0019 -0.0003 0.0000 0.0000 0.0000 0.0000

[0135] Figure 3bThe longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the third embodiment are shown. Among them, the longitudinal spherical aberration curve represents the deviation of the focal point of light of different wavelengths after passing through each lens of the optical system; the astigmatism curve represents the meridional image curvature and sagittal image curvature; the distortion curve represents the distortion value corresponding to different field angles. Figure 3b It can be seen that the optical system provided in the third embodiment can achieve good imaging quality.

[0136] Fourth embodiment

[0137] Please refer to Figure 4a and Figure 4b The optical system of this embodiment includes, in order from the object side to the image side along the optical axis:

[0138] The first lens L1 has positive refractive power. The object-side surface S1 of the first lens L1 is convex. The image-side surface S2 of the first lens L1 at the optical axis is concave, and the image-side surface S2 at the circumference is convex.

[0139] The second lens L2 has negative refractive power, and its object-side surface S3 is convex, and its image-side surface S4 is concave;

[0140] The third lens L3 has negative refractive power. The object-side surface S5 of the third lens L3 along the optical axis is convex, the object-side surface S5 along the circumference is concave, and the image-side surface S6 of the third lens L3 is concave.

[0141] The fourth lens L4 has positive refractive power, the object-side surface S7 of the fourth lens L4 is concave, and the image-side surface S8 of the fourth lens L4 is convex;

[0142] The fifth lens element L5 has negative refractive power. The object-side surface S9 of the fifth lens element L5 along the optical axis is convex, and the object-side surface S9 along the circumference is concave. The image-side surface S10 of the fifth lens element L5 along the optical axis is concave, and the image-side surface S10 along the circumference is convex.

[0143] The sixth lens L6 has positive refractive power. The object-side surface S11 of the sixth lens L6 along the optical axis is convex, and the object-side surface S11 along the circumference is concave. The image-side surface S12 of the sixth lens L6 along the optical axis is concave, and the image-side surface S12 along the circumference is convex.

[0144] The seventh lens element L7 has negative refractive power. The object-side surface S13 of the seventh lens element L7 is convex. The image-side surface S14 of the seventh lens element L7 along the optical axis is concave, and the image-side surface S14 along the circumference is convex.

[0145] The other structures of the fourth embodiment are the same as those of the first embodiment, and can be used as a reference.

[0146] Table 4a shows a table of characteristics of the optical system of this embodiment, wherein the data are obtained using light with a wavelength of 555 nm, and the units of Y radius, thickness and focal length are all millimeters (mm).

[0147] Table 4a

[0148]

[0149]

[0150] Among them, EFL is the effective focal length of the optical system, FNO is the aperture number of the optical system, and FOV is the field of view of the optical system.

[0151] Table 4b shows the high-order coefficients of various aspheric lenses that can be used in the fourth embodiment, wherein the various aspheric surface shapes can be defined by the formula given in the first embodiment.

[0152] Table 4b

[0153] Surface number K A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -0.5687 0.0045 0.0010 -0.0010 0.0020 -0.0023 0.0015 -0.0006 0.0001 0.0000 S2 1.8766 -0.0232 0.0337 -0.0376 0.0310 -0.0182 0.0072 -0.0018 0.0003 0.0000 S3 3.7650 -0.0378 0.0575 -0.0623 0.0517 -0.0319 0.0139 -0.0040 0.0007 -0.0001 S4 -2.4320 -0.0239 0.0457 -0.0531 0.0495 -0.0390 0.0243 -0.0108 0.0030 -0.0004 S5 0.0000 -0.0449 0.0165 -0.0195 0.0185 -0.0164 0.0124 -0.0067 0.0022 -0.0003 S6 -2.4196 -0.0277 0.0022 0.0171 -0.0414 0.0524 -0.0387 0.0170 -0.0040 0.0004 S7 99.0000 -0.0237 -0.0003 -0.0095 0.0190 -0.0218 0.0143 -0.0053 0.0010 -0.0001 S8 13.9255 -0.0297 -0.0021 0.0072 -0.0171 0.0188 -0.0117 0.0042 -0.0008 0.0001 S9 -25.6045 -0.0157 0.0200 -0.0175 0.0073 -0.0019 0.0003 0.0000 0.0000 0.0000 S10 -8.0029 -0.0732 0.0630 -0.0398 0.0163 -0.0045 0.0008 -0.0001 0.0000 0.0000 S11 -4.1648 -0.0126 0.0057 -0.0115 0.0053 -0.0013 0.0002 0.0000 0.0000 0.0000 S12 -6.8784 0.0399 -0.0274 0.0042 0.0006 -0.0004 0.0001 0.0000 0.0000 0.0000 S13 1.5200 -0.1371 0.0496 -0.0130 0.0025 -0.0003 0.0000 0.0000 0.0000 0.0000 S14 -1.1402 -0.1415 0.0542 -0.0160 0.0031 -0.0004 0.0000 0.0000 0.0000 0.0000

[0154] Figure 4b The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the fourth embodiment are shown. Among them, the longitudinal spherical aberration curve represents the deviation of the focal point of light of different wavelengths after passing through each lens of the optical system; the astigmatism curve represents the meridional image curvature and sagittal image curvature; the distortion curve represents the distortion value corresponding to different field angles. Figure 4b It can be seen that the optical system provided in the fourth embodiment can achieve good imaging quality.

[0155] Fifth embodiment

[0156] Please refer to Figure 5a and Figure 5b The optical system of this embodiment includes, in order from the object side to the image side along the optical axis:

[0157] The first lens L1 has positive refractive power. The object-side surface S1 of the first lens L1 is convex. The image-side surface S2 of the first lens L1 at the optical axis is concave, and the image-side surface S2 at the circumference is convex.

[0158] The second lens L2 has negative refractive power, and its object-side surface S3 is convex, and its image-side surface S4 is concave;

[0159] The third lens L3 has positive refractive power. The object-side surface S5 of the third lens L3 along the optical axis is convex, the object-side surface S5 along the circumference is concave, and the image-side surface S6 of the third lens L3 is concave.

[0160] The fourth lens L4 has positive refractive power, the object-side surface S7 of the fourth lens L4 is concave, and the image-side surface S8 of the fourth lens L4 is convex;

[0161] The fifth lens element L5 has positive refractive power. The object-side surface S9 of the fifth lens element L5 along the optical axis is convex, and the object-side surface S9 along the circumference is concave. The image-side surface S10 of the fifth lens element L5 along the optical axis is concave, and the image-side surface S10 along the circumference is convex.

[0162] The sixth lens element L6 has negative refractive power. The object-side surface S11 of the sixth lens element L6 along the optical axis is convex, and the object-side surface S11 along the circumference is concave. The image-side surface S12 of the sixth lens element L6 along the optical axis is concave, and the image-side surface S12 along the circumference is convex.

[0163] The seventh lens element L7 has negative refractive power. The object-side surface S13 of the seventh lens element L7 is convex. The image-side surface S14 of the seventh lens element L7 along the optical axis is concave, and the image-side surface S14 along the circumference is convex.

[0164] The other structures of the fifth embodiment are the same as those of the first embodiment, and can be referred to for reference.

[0165] Table 5a shows a table of characteristics of the optical system of this embodiment, wherein the data are obtained using light with a wavelength of 555 nm, and the units of Y radius, thickness and focal length are all millimeters (mm).

[0166] Table 5a

[0167]

[0168]

[0169] Among them, EFL is the effective focal length of the optical system, FNO is the aperture number of the optical system, and FOV is the field of view of the optical system.

[0170] Table 5b shows the high-order coefficients of various aspherical lenses that can be used in the fifth embodiment, wherein the various aspherical surface shapes can be defined by the formula given in the first embodiment.

[0171] Table 5b

[0172] Surface number K A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -0.5669 0.0051 -0.0002 0.0017 -0.0018 0.0011 -0.0004 0.0000 0.0000 0.0000 S2 2.8847 -0.0149 0.0114 -0.0043 -0.0026 0.0046 -0.0028 0.0009 -0.0002 0.0000 S3 3.7576 -0.0272 0.0251 -0.0118 -0.0038 0.0113 -0.0083 0.0031 -0.0006 0.0001 S4 -1.8799 -0.0136 0.0161 0.0055 -0.0384 0.0554 -0.0434 0.0199 -0.0051 0.0006 S5 0.0000 -0.0353 0.0016 0.0048 -0.0159 0.0155 -0.0082 0.0029 -0.0007 0.0001 S6 -5.5495 -0.0303 0.0259 -0.0614 0.0999 -0.1069 0.0727 -0.0297 0.0067 -0.0006 S7 99.0000 -0.0331 -0.0015 0.0319 -0.0869 0.1159 -0.0920 0.0436 -0.0114 0.0013 S8 15.3503 -0.0425 0.0090 0.0074 -0.0290 0.0337 -0.0214 0.0078 -0.0015 0.0001 S9 -34.8978 -0.0199 0.0256 -0.0250 0.0120 -0.0036 0.0007 -0.0001 0.0000 0.0000 S10 -5.3412 -0.0644 0.0670 -0.0490 0.0213 -0.0059 0.0010 -0.0001 0.0000 0.0000 S11 -5.6869 -0.0361 0.0240 -0.0245 0.0109 -0.0027 0.0004 0.0000 0.0000 0.0000 S12 -10.5507 0.0340 -0.0238 0.0021 0.0017 -0.0007 0.0001 0.0000 0.0000 0.0000 S13 17.1198 -0.1117 0.0448 -0.0126 0.0024 -0.0003 0.0000 0.0000 0.0000 0.0000 S14 -1.1369 -0.1304 0.0568 -0.0192 0.0040 -0.0005 0.0000 0.0000 0.0000 0.0000

[0173] Figure 5b The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the fifth embodiment are shown. Among them, the longitudinal spherical aberration curve represents the deviation of the focal point of light of different wavelengths after passing through each lens of the optical system; the astigmatism curve represents the meridional image curvature and sagittal image curvature; the distortion curve represents the distortion value corresponding to different field angles. Figure 5bIt can be seen that the optical system provided in the fifth embodiment can achieve good imaging quality.

[0174] Sixth embodiment

[0175] Please refer to Figure 6a and Figure 6b The optical system of this embodiment includes, in order from the object side to the image side along the optical axis:

[0176] The first lens L1 has positive refractive power, the object-side surface S1 of the first lens L1 is convex, and the image-side surface S2 of the first lens L1 is concave;

[0177] The second lens L2 has negative refractive power, and its object-side surface S3 is convex, and its image-side surface S4 is concave;

[0178] The third lens L3 has negative refractive power. The object-side surface S5 of the third lens L3 along the optical axis is convex, the object-side surface S5 along the circumference is concave, and the image-side surface S6 of the third lens L3 is concave.

[0179] The fourth lens L4 has positive refractive power, the object-side surface S7 of the fourth lens L4 is concave, and the image-side surface S8 of the fourth lens L4 is convex;

[0180] The fifth lens element L5 has positive refractive power. The object-side surface S9 of the fifth lens element L5 along the optical axis is convex, and the object-side surface S9 along the circumference is concave. The image-side surface S10 of the fifth lens element L5 along the optical axis is concave, and the image-side surface S10 along the circumference is convex.

[0181] The sixth lens L6 has positive refractive power. The object-side surface S11 of the sixth lens L6 along the optical axis is convex, and the object-side surface S11 along the circumference is concave. The image-side surface S12 of the sixth lens L6 along the optical axis is concave, and the image-side surface S12 along the circumference is convex.

[0182] The seventh lens element L7 has negative refractive power. The object-side surface S13 of the seventh lens element L7 along the optical axis is convex, and the object-side surface S13 along the circumference is concave. The image-side surface S14 of the seventh lens element L7 along the optical axis is concave, and the image-side surface S14 along the circumference is convex.

[0183] The other structures of the sixth embodiment are the same as those of the first embodiment, and can be referred to for reference.

[0184] Table 6a shows a table of characteristics of the optical system of this embodiment, wherein the data are obtained using light with a wavelength of 555 nm, and the units of Y radius, thickness and focal length are all millimeters (mm).

[0185] Table 6a

[0186]

[0187]

[0188] Among them, EFL is the effective focal length of the optical system, FNO is the aperture number of the optical system, and FOV is the field of view of the optical system.

[0189] Table 6b shows the high-order coefficients of various aspheric lenses that can be used in the sixth embodiment, wherein the various aspheric surface shapes can be defined by the formula given in the first embodiment.

[0190] Table 6b

[0191] Surface number K A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -0.5502 0.0047 0.0022 -0.0036 0.0054 -0.0050 0.0028 -0.0010 0.0002 0.0000 S2 7.5959 -0.0138 0.0125 -0.0146 0.0160 -0.0117 0.0053 -0.0014 0.0002 0.0000 S3 5.3671 -0.0244 0.0181 -0.0092 0.0038 0.0008 -0.0026 0.0016 -0.0004 0.0000 S4 -1.4656 -0.0099 0.0057 0.0204 -0.0522 0.0681 -0.0536 0.0252 -0.0065 0.0007 S5 0.0000 -0.0349 0.0051 -0.0122 0.0135 -0.0084 0.0022 0.0003 -0.0002 0.0000 S6 -8.9428 -0.0290 0.0081 -0.0140 0.0188 -0.0164 0.0097 -0.0035 0.0007 -0.0001 S7 -2.9088 -0.0328 0.0021 -0.0017 -0.0123 0.0252 -0.0252 0.0141 -0.0042 0.0005 S8 17.6861 -0.0338 0.0007 0.0058 -0.0157 0.0169 -0.0102 0.0036 -0.0007 0.0001 S9 -23.5570 -0.0129 0.0125 -0.0106 0.0041 -0.0013 0.0003 -0.0001 0.0000 0.0000 S10 -8.6259 -0.0602 0.0413 -0.0200 0.0058 -0.0012 0.0002 0.0000 0.0000 0.0000 S11 -4.8419 -0.0094 -0.0100 0.0009 0.0011 -0.0007 0.0002 0.0000 0.0000 0.0000 S12 -10.2326 0.0390 -0.0359 0.0126 -0.0029 0.0004 0.0000 0.0000 0.0000 0.0000 S13 87.1386 -0.1212 0.0515 -0.0158 0.0032 -0.0004 0.0000 0.0000 0.0000 0.0000 S14 -1.1476 -0.1279 0.0512 -0.0151 0.0028 -0.0003 0.0000 0.0000 0.0000 0.0000

[0192] Figure 6b The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the sixth embodiment are shown. Among them, the longitudinal spherical aberration curve represents the deviation of the focal point of light of different wavelengths after passing through each lens of the optical system; the astigmatism curve represents the meridional image curvature and sagittal image curvature; the distortion curve represents the distortion value corresponding to different field angles. Figure 6b It can be seen that the optical system provided in the sixth embodiment can achieve good imaging quality.

[0193] Seventh embodiment

[0194] Please refer to Figure 7a and Figure 7b The optical system of this embodiment includes, in order from the object side to the image side along the optical axis:

[0195] The first lens L1 has positive refractive power, the object-side surface S1 of the first lens L1 is convex, and the image-side surface S2 of the first lens L1 is concave;

[0196] The second lens L2 has negative refractive power, the object-side surface S3 of the second lens L2 is convex, and the image-side surface S4 of the first lens L2 is concave;

[0197] The third lens L3 has negative refractive power. The object-side surface S5 of the third lens L3 along the optical axis is convex, the object-side surface S5 along the circumference is concave, and the image-side surface S6 of the third lens L3 is concave.

[0198] The fourth lens L4 has positive refractive power. The object-side surface S7 of the fourth lens L4 along the optical axis is convex, the object-side surface S7 along the circumference is concave, and the image-side surface S8 of the fourth lens L4 is convex.

[0199] The fifth lens element L5 has positive refractive power. The object-side surface S9 of the fifth lens element L5 along the optical axis is convex, and the object-side surface S9 along the circumference is concave. The image-side surface S10 of the fifth lens element L5 is concave.

[0200] The sixth lens L6 has positive refractive power. The object-side surface S11 of the sixth lens L6 along the optical axis is convex, and the object-side surface S11 along the circumference is concave. The image-side surface S12 of the sixth lens L6 along the optical axis is concave, and the image-side surface S12 along the circumference is convex.

[0201] The seventh lens element L7 has negative refractive power. The object-side surface S13 of the seventh lens element L7 along the optical axis is convex, and the object-side surface S13 along the circumference is concave. The image-side surface S14 of the seventh lens element L7 along the optical axis is concave, and the image-side surface S14 along the circumference is convex.

[0202] The other structures of the seventh embodiment are the same as those of the first embodiment, and can be used as a reference.

[0203] Table 7a shows a table of characteristics of the optical system of this embodiment, wherein the data are obtained using light with a wavelength of 555 nm, and the units of Y radius, thickness and focal length are all millimeters (mm).

[0204] Table 7a

[0205]

[0206]

[0207] Among them, EFL is the effective focal length of the optical system, FNO is the aperture number of the optical system, and FOV is the field of view of the optical system.

[0208] Table 7b shows the high-order coefficients of various aspheric lenses that can be used in the seventh embodiment, wherein the various aspheric surface shapes can be defined by the formula given in the first embodiment.

[0209] Table 7b

[0210] Surface number K A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -0.5251 0.0027 0.0110 -0.0244 0.0329 -0.0267 0.0133 -0.0040 0.0006 0.0000 S2 7.5637 -0.0132 0.0150 -0.0231 0.0278 -0.0215 0.0104 -0.0030 0.0005 0.0000 S3 5.2154 -0.0232 0.0157 -0.0034 -0.0077 0.0129 -0.0093 0.0036 -0.0007 0.0001 S4 -1.3649 -0.0119 0.0117 0.0136 -0.0578 0.0907 -0.0785 0.0390 -0.0104 0.0012 S5 0.0000 -0.0313 -0.0108 0.0462 -0.0965 0.1118 -0.0779 0.0327 -0.0076 0.0008 S6 -9.1694 -0.0276 -0.0012 0.0245 -0.0568 0.0710 -0.0546 0.0262 -0.0071 0.0008 S7 -99.0000 -0.0350 0.0104 -0.0184 0.0079 0.0157 -0.0291 0.0205 -0.0068 0.0009 S8 17.7619 -0.0337 -0.0008 0.0134 -0.0265 0.0256 -0.0145 0.0048 -0.0009 0.0001 S9 -25.8861 -0.0187 0.0270 -0.0265 0.0130 -0.0041 0.0008 -0.0001 0.0000 0.0000 S10 -8.1563 -0.0701 0.0662 -0.0439 0.0183 -0.0051 0.0009 -0.0001 0.0000 0.0000 S11 -4.8852 -0.0113 -0.0006 -0.0094 0.0059 -0.0018 0.0003 0.0000 0.0000 0.0000 S12 -9.6613 0.0473 -0.0389 0.0110 -0.0015 0.0000 0.0000 0.0000 0.0000 0.0000 S13 99.0000 -0.1261 0.0595 -0.0198 0.0043 -0.0006 0.0000 0.0000 0.0000 0.0000 S14 -1.1378 -0.1581 0.0721 -0.0239 0.0050 -0.0006 0.0001 0.0000 0.0000 0.0000

[0211] Figure 7b The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system of the seventh embodiment are shown. The longitudinal spherical aberration curve represents the deviation of the focal point of light of different wavelengths after passing through each lens of the optical system; the astigmatism curve represents the meridional image curvature and sagittal image curvature; and the distortion curve represents the distortion value corresponding to different field angles. Figure 7b It can be seen that the optical system provided in the seventh embodiment can achieve good imaging quality.

[0212] Eighth embodiment

[0213] Please refer to Figure 8a and Figure 8b The optical system of this embodiment includes, in order from the object side to the image side along the optical axis:

[0214] The first lens L1 has positive refractive power. The object-side surface S1 of the first lens L1 is convex. The image-side surface S2 of the first lens L1 at the optical axis is concave, and the image-side surface S2 at the circumference is convex.

[0215] The second lens L2 has negative refractive power, and its object-side surface S3 is convex, and its image-side surface S4 is concave;

[0216] The third lens L3 has negative refractive power. The object-side surface S5 of the third lens L3 along the optical axis is convex, the object-side surface S5 along the circumference is concave, and the image-side surface S6 of the third lens L3 is concave.

[0217] The fourth lens L4 has positive refractive power. The object-side surface S7 of the fourth lens L4 along the optical axis is convex, the object-side surface S7 along the circumference is concave, and the image-side surface S8 of the fourth lens L4 is convex.

[0218] The fifth lens element L5 has positive refractive power. The object-side surface S9 of the fifth lens element L5 along the optical axis is convex, and the object-side surface S9 along the circumference is concave. The image-side surface S10 of the fifth lens element L5 along the optical axis is concave, and the image-side surface S10 along the circumference is convex.

[0219] The sixth lens element L6 has negative refractive power. The object-side surface S11 of the sixth lens element L6 along the optical axis is convex, and the object-side surface S11 along the circumference is concave. The image-side surface S12 of the sixth lens element L6 along the optical axis is concave, and the image-side surface S12 along the circumference is convex.

[0220] The seventh lens element L7 has negative refractive power. The object-side surface S13 of the seventh lens element L7 along the optical axis is convex, and the object-side surface S13 along the circumference is concave. The image-side surface S14 of the seventh lens element L7 along the optical axis is concave, and the image-side surface S14 along the circumference is convex.

[0221] The other structures of the eighth embodiment are the same as those of the first embodiment, and can be used as a reference.

[0222] Table 8a shows a table of characteristics of the optical system of this embodiment, wherein the data are obtained using light with a wavelength of 555 nm, and the units of Y radius, thickness and focal length are all millimeters (mm).

[0223] Table 8a

[0224]

[0225]

[0226] Among them, EFL is the effective focal length of the optical system, FNO is the aperture number of the optical system, and FOV is the field of view of the optical system.

[0227] Table 8b shows the high-order coefficients of various aspheric lenses that can be used in the eighth embodiment, wherein the various aspheric surface shapes can be defined by the formula given in the first embodiment.

[0228] Table 8b

[0229] Surface number K A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -0.67889 0.0053 0.0002 0.0003 -0.0002 -0.0001 0.0002 -0.0001 0.0000 0.0000 S2 -39.8415 -0.0125 0.0048 -0.0020 0.0030 -0.0032 0.0020 -0.0007 0.0001 0.0000 S3 11.3404 -0.0185 0.0108 -0.0090 0.0147 -0.0151 0.0094 -0.0035 0.0007 -0.0001 S4 -1.03399 -0.0047 0.0088 -0.0099 0.0116 -0.0075 0.0009 0.0017 -0.0010 0.0002 S5 0 -0.0371 0.0017 0.0025 -0.0130 0.0168 -0.0119 0.0052 -0.0013 0.0001 S6 -12.354 -0.0304 0.0070 -0.0051 0.0033 -0.0032 0.0036 -0.0020 0.0005 -0.0001 S7 99 -0.0279 -0.0079 0.0319 -0.0700 0.0878 -0.0679 0.0317 -0.0082 0.0009 S8 18.98434 -0.0292 -0.0015 0.0025 -0.0023 0.0007 0.0002 -0.0003 0.0001 0.0000 S9 -21.6674 0.0063 -0.0100 0.0009 0.0008 -0.0010 0.0004 -0.0001 0.0000 0.0000 S10 2.148333 -0.0065 -0.0011 -0.0011 0.0002 -0.0001 0.0000 0.0000 0.0000 0.0000 S11 -5.93718 -0.0129 -0.0059 -0.0041 0.0029 -0.0008 0.0001 0.0000 0.0000 0.0000 S12 -9.3428 0.0281 -0.0263 0.0073 -0.0011 0.0001 0.0000 0.0000 0.0000 0.0000 S13 99 -0.1289 0.0691 -0.0218 0.0041 -0.0005 0.0000 0.0000 0.0000 0.0000 S14 -0.99262 -0.1320 0.0548 -0.0148 0.0024 -0.0002 0.0000 0.0000 0.0000 0.0000

[0230] Figure 8b The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system of the eighth embodiment are shown. The longitudinal spherical aberration curve represents the deviation of the focal point of light of different wavelengths after passing through each lens of the optical system; the astigmatism curve represents the meridional image curvature and sagittal image curvature; and the distortion curve represents the distortion value corresponding to different field angles. Figure 8b It can be seen that the optical system provided in the eighth embodiment can achieve good imaging quality.

[0231] Ninth embodiment

[0232] Please refer to Figure 9a and Figure 9b The optical system of this embodiment includes, in order from the object side to the image side along the optical axis:

[0233] The first lens L1 has positive refractive power. The object-side surface S1 of the first lens L1 is convex. The image-side surface S2 of the first lens L1 at the optical axis is concave, and the image-side surface S2 at the circumference is convex.

[0234] The second lens L2 has negative refractive power, and its object-side surface S3 is convex, and its image-side surface S4 is concave;

[0235] The third lens L3 has negative refractive power. The object-side surface S5 of the third lens L3 along the optical axis is convex, the object-side surface S5 along the circumference is concave, and the image-side surface S6 of the third lens L3 is concave.

[0236] The fourth lens L4 has positive refractive power. The object-side surface S7 of the fourth lens L4 along the optical axis is convex, the object-side surface S7 along the circumference is concave, and the image-side surface S8 of the fourth lens L4 is convex.

[0237] The fifth lens element L5 has positive refractive power. The object-side surface S9 of the fifth lens element L5 along the optical axis is convex, and the object-side surface S9 along the circumference is concave. The image-side surface S10 of the fifth lens element L5 along the optical axis is concave, and the image-side surface S10 along the circumference is convex.

[0238] The sixth lens element L6 has negative refractive power. The object-side surface S11 of the sixth lens element L6 along the optical axis is convex, and the object-side surface S11 along the circumference is concave. The image-side surface S12 of the sixth lens element L6 along the optical axis is concave, and the image-side surface S12 along the circumference is convex.

[0239] The seventh lens element L7 has negative refractive power. The object-side surface S13 of the seventh lens element L7 is concave. The image-side surface S14 of the seventh lens element L7 along the optical axis is concave, and the image-side surface S14 along the circumference is convex.

[0240] The other structures of the ninth embodiment are the same as those of the first embodiment, and can be used as a reference.

[0241] Table 9a shows a table of the characteristics of the optical system of this embodiment, wherein the data are obtained using light with a wavelength of 555 nm, and the units of Y radius, thickness and focal length are all millimeters (mm).

[0242] Table 9a

[0243]

[0244]

[0245] Among them, EFL is the effective focal length of the optical system, FNO is the aperture number of the optical system, and FOV is the field of view of the optical system.

[0246] Table 9b shows the high-order coefficients of various aspherical lenses that can be used in the ninth embodiment, wherein the various aspherical surface shapes can be defined by the formula given in the first embodiment.

[0247] Table 9b

[0248] Surface number K A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -0.6954 0.0054 0.0002 0.0003 -0.0002 -0.0001 0.0002 -0.0001 0.0000 0.0000 S2 -44.4292 -0.0126 0.0050 -0.0023 0.0035 -0.0038 0.0024 -0.0009 0.0002 0.0000 S3 11.9867 -0.0185 0.0111 -0.0094 0.0155 -0.0162 0.0103 -0.0039 0.0008 -0.0001 S4 -0.9667 -0.0047 0.0088 -0.0100 0.0124 -0.0089 0.0023 0.0010 -0.0008 0.0002 S5 0.0000 -0.0374 0.0019 0.0022 -0.0125 0.0166 -0.0119 0.0053 -0.0014 0.0002 S6 -12.7535 -0.0305 0.0071 -0.0056 0.0042 -0.0040 0.0040 -0.0020 0.0005 -0.0001 S7 99.0000 -0.0277 -0.0083 0.0330 -0.0716 0.0893 -0.0686 0.0318 -0.0082 0.0009 S8 18.5929 -0.0289 -0.0015 0.0024 -0.0020 0.0003 0.0005 -0.0003 0.0001 0.0000 S9 -20.9792 0.0068 -0.0103 0.0010 0.0009 -0.0010 0.0005 -0.0001 0.0000 0.0000 S10 3.2034 -0.0045 -0.0024 -0.0004 -0.0001 0.0000 0.0000 0.0000 0.0000 0.0000 S11 -6.0188 -0.0127 -0.0069 -0.0032 0.0025 -0.0008 0.0001 0.0000 0.0000 0.0000 S12 -9.2245 0.0274 -0.0271 0.0084 -0.0016 0.0002 0.0000 0.0000 0.0000 0.0000 S13 -99.0000 -0.1240 0.0656 -0.0204 0.0038 -0.0004 0.0000 0.0000 0.0000 0.0000 S14 -0.9676 -0.1275 0.0520 -0.0138 0.0022 -0.0002 0.0000 0.0000 0.0000 0.0000

[0249] Figure 9b The longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system of the ninth embodiment are shown. The longitudinal spherical aberration curve represents the deviation of the focal point of light of different wavelengths after passing through each lens of the optical system; the astigmatism curve represents the meridional image curvature and sagittal image curvature; and the distortion curve represents the distortion value corresponding to different field angles. Figure 9b It can be seen that the optical system provided in the ninth embodiment can achieve good imaging quality.

[0250] Tenth embodiment

[0251] Please refer to Figure 10a and Figure 10b The optical system of this embodiment includes, in order from the object side to the image side along the optical axis:

[0252] The first lens L1 has positive refractive power, the object-side surface S1 of the first lens L1 is convex, and the image-side surface S2 of the first lens L1 is concave;

[0253] The second lens L2 has negative refractive power, the object-side surface S3 of the second lens L2 is convex, and the image-side surface S4 of the second lens L1 is concave;

[0254] The third lens L3 has positive refractive power. The object-side surface S5 of the third lens L3 is convex, the object-side surface S5 at the circumference is concave, and the image-side surface S6 of the third lens L3 is concave.

[0255] The fourth lens L4 has positive refractive power, the object-side surface S7 of the fourth lens L4 is concave, and the image-side surface S8 of the fourth lens L4 is convex;

[0256] The fifth lens element L5 has positive refractive power. The object-side surface S9 of the fifth lens element L5 along the optical axis is convex, and the object-side surface S9 along the circumference is concave. The image-side surface S10 of the fifth lens element L5 along the optical axis is concave, and the image-side surface S10 along the circumference is convex.

[0257] The sixth lens L6 has positive refractive power. The object-side surface S11 of the sixth lens L6 along the optical axis is convex, and the object-side surface S11 along the circumference is concave. The image-side surface S12 of the sixth lens L6 is convex.

[0258] The seventh lens element L7 has negative refractive power. The object-side surface S13 of the seventh lens element L7 along the optical axis is concave, and the object-side surface S11 along the circumference is convex. The image-side surface S14 of the seventh lens element L7 along the optical axis is concave, and the image-side surface S14 along the circumference is convex.

[0259] The other structures of the tenth embodiment are the same as those of the first embodiment, and can be used as a reference.

[0260] Table 10a shows a table of characteristics of the optical system of this embodiment, wherein the data are obtained using light with a wavelength of 555 nm, and the units of Y radius, thickness and focal length are all millimeters (mm).

[0261] Table 10a

[0262]

[0263]

[0264] Among them, EFL is the effective focal length of the optical system, FNO is the aperture number of the optical system, and FOV is the field of view of the optical system.

[0265] Table 10b shows the high-order coefficients of various aspherical lenses that can be used in the tenth embodiment, wherein the various aspherical surface shapes can be defined by the formula given in the first embodiment.

[0266] Table 10b

[0267] Surface number K A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -0.4812 0.0056 0.0022 -0.0039 0.0077 -0.0086 0.0058 -0.0023 0.0005 0.0000 S2 6.9763 -0.0219 0.0212 -0.0190 0.0202 -0.0209 0.0148 -0.0063 0.0015 -0.0001 S3 5.8591 -0.0323 0.0421 -0.0287 0.0148 -0.0105 0.0086 -0.0045 0.0013 -0.0001 S4 -0.4022 -0.0226 0.0301 -0.0117 -0.0031 -0.0026 0.0123 -0.0104 0.0038 -0.0005 S5 0.0000 -0.0460 0.0165 -0.0333 0.0398 -0.0305 0.0130 -0.0022 -0.0001 0.0000 S6 -3.9014 -0.0255 0.0149 -0.0318 0.0376 -0.0239 0.0059 0.0018 -0.0013 0.0002 S7 -70.1826 -0.0253 0.0161 -0.0419 0.0672 -0.0742 0.0516 -0.0216 0.0049 -0.0005 S8 61.8138 -0.0516 0.0250 -0.0229 0.0135 -0.0046 0.0000 0.0006 -0.0002 0.0000 S9 -9.7197 -0.0490 0.0094 -0.0122 0.0161 -0.0115 0.0046 -0.0011 0.0001 0.0000 S10 -2.6900 -0.0467 0.0014 -0.0209 0.0199 -0.0088 0.0023 -0.0003 0.0000 0.0000 S11 -19.8695 0.0487 0.0034 -0.0292 0.0173 -0.0058 0.0012 -0.0002 0.0000 0.0000 S12 -9.9253 0.0410 0.0223 -0.0213 0.0066 -0.0011 0.0001 0.0000 0.0000 0.0000 S13 -9.0430 0.0117 -0.0519 0.0276 -0.0069 0.0010 -0.0001 0.0000 0.0000 0.0000 S14 -0.9532 -0.0637 0.0056 0.0025 -0.0012 0.0002 0.0000 0.0000 0.0000 0.0000

[0268] Figure 10bThe longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system of the tenth embodiment are shown. The longitudinal spherical aberration curve represents the deviation of the focal point of light of different wavelengths after passing through each lens of the optical system; the astigmatism curve represents the meridional image curvature and sagittal image curvature; and the distortion curve represents the distortion value corresponding to different field angles. Figure 10b It can be seen that the optical system provided in the tenth embodiment can achieve good imaging quality.

[0269] Eleventh embodiment

[0270] Please refer to Figure 11a and Figure 11b The optical system of this embodiment includes, in order from the object side to the image side along the optical axis:

[0271] The first lens L1 has positive refractive power. The object-side surface S1 of the first lens L1 is convex. The image-side surface S2 of the first lens L1 at the optical axis is concave, and the image-side surface S2 at the circumference is convex.

[0272] The second lens L2 has negative refractive power, the object-side surface S3 of the second lens L2 is convex, and the image-side surface S4 of the second lens L1 is concave;

[0273] The third lens L3 has negative refractive power. The object-side surface S5 of the third lens L3 is convex, the object-side surface S5 at the circumference is concave, and the image-side surface S6 of the third lens L3 is concave.

[0274] The fourth lens L4 has positive refractive power. The object-side surface S7 of the fourth lens L4 along the optical axis is convex, the object-side surface S7 along the circumference is concave, and the image-side surface S8 of the fourth lens L4 is convex.

[0275] The fifth lens element L5 has positive refractive power. The object-side surface S9 of the fifth lens element L5 along the optical axis is convex, and the object-side surface S9 along the circumference is concave. The image-side surface S10 of the fifth lens element L5 along the optical axis is concave, and the image-side surface S10 along the circumference is convex.

[0276] The sixth lens L6 has positive refractive power. The object-side surface S11 of the sixth lens L6 along the optical axis is convex, and the object-side surface S11 along the circumference is concave. The image-side surface S12 of the sixth lens L6 along the optical axis is concave, and the image-side surface S12 along the circumference is convex.

[0277] The seventh lens element L7 has negative refractive power. The object-side surface S13 of the seventh lens element L7 is concave. The image-side surface S14 of the seventh lens element L7 along the optical axis is concave, and the image-side surface S14 along the circumference is convex.

[0278] The other structures of the eleventh embodiment are the same as those of the first embodiment, and can be used as a reference.

[0279] Table 11a shows a table of characteristics of the optical system of this embodiment, wherein the data are obtained using light with a wavelength of 555 nm, and the units of Y radius, thickness and focal length are all millimeters (mm).

[0280] Table 11a

[0281]

[0282]

[0283] Among them, EFL is the effective focal length of the optical system, FNO is the aperture number of the optical system, and FOV is the field of view of the optical system.

[0284] Table 11b shows the high-order coefficients of various aspheric lenses that can be used in the eleventh embodiment, wherein the various aspheric surface shapes can be defined by the formula given in the first embodiment.

[0285] Table 11b

[0286] Surface number K A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -0.6762 0.0054 0.0000 0.0016 -0.0030 0.0032 -0.0021 0.0008 -0.0002 0.0000 S2 -43.6163 -0.0126 0.0004 0.0131 -0.0223 0.0226 -0.0146 0.0057 -0.0012 0.0001 S3 11.7188 -0.0191 0.0060 0.0086 -0.0145 0.0144 -0.0094 0.0038 -0.0009 0.0001 S4 -0.8173 -0.0042 0.0029 0.0089 -0.0213 0.0281 -0.0229 0.0112 -0.0031 0.0004 S5 0.0000 -0.0372 0.0050 -0.0138 0.0212 -0.0243 0.0181 -0.0079 0.0019 -0.0002 S6 -13.0648 -0.0305 0.0088 -0.0120 0.0144 -0.0131 0.0088 -0.0036 0.0008 -0.0001 S7 25.6561 -0.0285 -0.0038 0.0174 -0.0401 0.0501 -0.0385 0.0179 -0.0046 0.0005 S8 18.0274 -0.0296 0.0012 -0.0038 0.0060 -0.0059 0.0034 -0.0012 0.0002 0.0000 S9 -20.1036 0.0080 -0.0124 0.0034 -0.0005 -0.0005 0.0003 -0.0001 0.0000 0.0000 S10 3.3996 -0.0039 -0.0052 0.0026 -0.0018 0.0005 -0.0001 0.0000 0.0000 0.0000 S11 -6.0132 -0.0125 -0.0069 -0.0031 0.0025 -0.0008 0.0001 0.0000 0.0000 0.0000 S12 -9.3790 0.0250 -0.0247 0.0072 -0.0012 0.0001 0.0000 0.0000 0.0000 0.0000 S13 -99.0000 -0.1278 0.0688 -0.0217 0.0041 -0.0005 0.0000 0.0000 0.0000 0.0000 S14 -0.9608 -0.1278 0.0533 -0.0145 0.0024 -0.0002 0.0000 0.0000 0.0000 0.0000

[0287] Figure 11b The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the eleventh embodiment are shown. Among them, the longitudinal spherical aberration curve represents the deviation of the focal point of light of different wavelengths after passing through each lens of the optical system; the astigmatism curve represents the meridional image curvature and sagittal image curvature; and the distortion curve represents the distortion value corresponding to different field angles. Figure 11b It can be seen that the optical system provided in the eleventh embodiment can achieve good imaging quality.

[0288] Twelfth embodiment

[0289] Please refer to Figure 12a and Figure 12b The optical system of this embodiment includes, in order from the object side to the image side along the optical axis:

[0290] The first lens L1 has positive refractive power, the object-side surface S1 of the first lens L1 is convex, and the image-side surface S2 of the first lens L1 is concave;

[0291] The second lens L2 has negative refractive power, the object-side surface S3 of the second lens L2 is convex, and the image-side surface S4 of the second lens L1 is concave;

[0292] The third lens L3 has negative refractive power. The object-side surface S5 of the third lens L3 is convex, the object-side surface S5 at the circumference is concave, and the image-side surface S6 of the third lens L3 is concave.

[0293] The fourth lens L4 has positive refractive power. The object-side surface S7 of the fourth lens L4 along the optical axis is convex, the object-side surface S7 along the circumference is concave, and the image-side surface S8 of the fourth lens L4 is convex.

[0294] The fifth lens element L5 has positive refractive power. The object-side surface S9 of the fifth lens element L5 along the optical axis is convex, and the object-side surface S9 along the circumference is concave. The image-side surface S10 of the fifth lens element L5 is concave.

[0295] The sixth lens L6 has positive refractive power. The object-side surface S11 of the sixth lens L6 along the optical axis is convex, and the object-side surface S11 along the circumference is concave. The image-side surface S12 of the sixth lens L6 along the optical axis is concave, and the image-side surface S12 along the circumference is convex.

[0296] The seventh lens element L7 has negative refractive power. The object-side surface S13 of the seventh lens element L7 along the optical axis is convex, and the object-side surface S13 along the circumference is concave. The image-side surface S14 of the seventh lens element L7 along the optical axis is concave, and the image-side surface S14 along the circumference is convex.

[0297] The other structures of the twelfth embodiment are the same as those of the first embodiment, and can be used as a reference.

[0298] Table 12a shows a table of the characteristics of the optical system of this embodiment, wherein the data are obtained using light with a wavelength of 555 nm, and the units of Y radius, thickness and focal length are all millimeters (mm).

[0299] Table 12a

[0300]

[0301]

[0302] Among them, EFL is the effective focal length of the optical system, FNO is the aperture number of the optical system, and FOV is the field of view of the optical system.

[0303] Table 12b shows the high-order coefficients of various aspherical lenses that can be used in the twelfth embodiment, wherein the various aspherical surface shapes can be defined by the formula given in the first embodiment.

[0304] Table 12b

[0305] Surface number K A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -0.5466 0.0046 0.0031 -0.0054 0.0073 -0.0059 0.0029 -0.0008 0.0001 0.0000 S2 5.9640 -0.0157 0.0116 -0.0041 -0.0035 0.0074 -0.0062 0.0029 -0.0007 0.0001 S3 5.7670 -0.0275 0.0232 -0.0106 0.0000 0.0052 -0.0043 0.0017 -0.0003 0.0000 S4 -1.4293 -0.0123 0.0183 -0.0144 0.0145 -0.0170 0.0149 -0.0078 0.0022 -0.0002 S5 0.0000 -0.0355 0.0065 -0.0120 0.0117 -0.0081 0.0029 0.0003 -0.0005 0.0001 S6 -8.9095 -0.0301 0.0124 -0.0243 0.0367 -0.0376 0.0256 -0.0107 0.0026 -0.0003 S7 -99.0000 -0.0322 0.0000 0.0029 -0.0168 0.0251 -0.0209 0.0101 -0.0027 0.0003 S8 17.5722 -0.0332 0.0024 -0.0010 -0.0041 0.0056 -0.0036 0.0013 -0.0002 0.0000 S9 -22.6951 -0.0128 0.0122 -0.0104 0.0044 -0.0015 0.0004 -0.0001 0.0000 0.0000 S10 -8.8637 -0.0592 0.0398 -0.0194 0.0059 -0.0013 0.0002 0.0000 0.0000 0.0000 S11 -4.7723 -0.0089 -0.0095 0.0013 0.0005 -0.0004 0.0001 0.0000 0.0000 0.0000 S12 -10.3919 0.0368 -0.0332 0.0112 -0.0025 0.0003 0.0000 0.0000 0.0000 0.0000 S13 73.3908 -0.1167 0.0467 -0.0137 0.0027 -0.0003 0.0000 0.0000 0.0000 0.0000 S14 -1.1357 -0.1175 0.0438 -0.0122 0.0022 -0.0002 0.0000 0.0000 0.0000 0.0000

[0306] Figure 12b The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the twelfth embodiment are shown. Among them, the longitudinal spherical aberration curve represents the deviation of the focal point of light of different wavelengths after passing through each lens of the optical system; the astigmatism curve represents the meridional image curvature and sagittal image curvature; and the distortion curve represents the distortion value corresponding to different field angles. Figure 12b It can be seen that the optical system provided in the twelfth embodiment can achieve good imaging quality.

[0307] Table 13 shows the refractive power of each lens of the optical systems according to the first to twelfth embodiments.

[0308] Table 13

[0309]

[0310] Table 14 shows the surface structures of the lenses of the optical systems of the first to twelfth embodiments at the optical axis.

[0311] Table 14

[0312]

[0313]

[0314] Table 15 shows the surface structure of each lens at the circumference of the optical system of the first embodiment to the twelfth embodiment.

[0315] Table 15

[0316]

[0317] Table 16 shows the L / Imgh values ​​of the optical systems of the first to twelfth embodiments. It can be seen from Table 16 that each embodiment satisfies the condition: 0.6 <L / Imgh<0.8。

[0318] Table 16

[0319] 0.6<L / Imgh<0.8 First embodiment 3.31 / 4.8 0.69 Second embodiment 3.31 / 4.8 0.69 Third embodiment 3.32 / 4.8 0.69 Fourth embodiment 3.45 / 4.8 0.72 Fifth embodiment 3.46 / 4.8 0.72 Sixth embodiment 3.42 / 4.8 0.71 Seventh embodiment 3.54 / 4.8 0.74 Eighth embodiment 3.35 / 4.8 0.70 Ninth embodiment 3.34 / 4.8 0.70 Tenth embodiment 3.23 / 4.8 0.67 Eleventh embodiment 3.08 / 4.8 0.64 Twelfth embodiment 2.95 / 4.8 0.62

[0320] Table 17 shows the f14 / f values ​​of the optical systems of the first to twelfth embodiments. It can be seen from Table 17 that each embodiment satisfies the following conditions: <f14 / f<1.5。

[0321] Table 17

[0322] 1<f14 / f<1.5 First embodiment 7.12 / 5.56 1.30 Second embodiment 6.71 / 5.56 1.21 Third embodiment 6.51 / 5.58 1.17 Fourth embodiment 6.80 / 5.79 1.17 Fifth embodiment 6.37 / 5.82 1.09 Sixth embodiment 6.51 / 5.74 1.13 Seventh embodiment 6.47 / 5.94 1.09 Eighth embodiment 6.36 / 5.62 1.13 Ninth embodiment 6.35 / 5.61 1.13 Tenth embodiment 7.02 / 5.54 1.27 Eleventh embodiment 6.38 / 5.61 1.14 Twelfth embodiment 6.56 / 5.67 1.16

[0323] Table 18 shows the Fno values ​​of the optical systems of the first embodiment to the twelfth embodiment. It can be seen from Table 18 that each embodiment satisfies the condition: Fno<2.

[0324] Table 18

[0325] Fno<2 First embodiment 1.68 1.68 Second embodiment 1.68 1.68 Third embodiment 1.68 1.68 Fourth embodiment 1.68 1.68 Fifth embodiment 1.68 1.68 Sixth embodiment 1.68 1.68 Seventh embodiment 1.68 1.68 Eighth embodiment 1.68 1.68 Ninth embodiment 1.68 1.68 Tenth embodiment 1.75 1.75 Eleventh embodiment 1.82 1.82 Twelfth embodiment 1.92 1.92

[0326] Table 19 shows the Fno / TTL values ​​of the optical systems of the first to twelfth embodiments. It can be seen from Table 19 that each embodiment meets the condition: Fno / TTL<0.29.

[0327] Table 19

[0328] Fno / TTL<0.29 First embodiment 1.68 / 6.69 0.251 Second embodiment 1.68 / 6.68 0.251 Third embodiment 1.68 / 6.69 0.251 Fourth embodiment 1.68 / 6.80 0.247 Fifth embodiment 1.68 / 6.80 0.247 Sixth embodiment 1.68 / 6.80 0.247 Seventh embodiment 1.68 / 6.80 0.247 Eighth embodiment 1.68 / 6.80 0.247 Ninth embodiment 1.68 / 6.80 0.247 Tenth embodiment 1.75 / 6.69 0.262 Eleventh embodiment 1.82 / 6.80 0.268 Twelfth embodiment 1.92 / 6.80 0.282

[0329] Table 20 shows the TTL / D values ​​of the optical systems of the first to twelfth embodiments. It can be seen from Table 20 that each embodiment meets the condition: 1.5 <TTL / D<2.5。

[0330] Table 20

[0331]

[0332]

[0333] Table 21 shows the TTL / Imgh values ​​of the optical systems of the first to twelfth embodiments. It can be seen from Table 21 that each embodiment meets the condition: TTL / Imgh<1.5.

[0334] Table 21

[0335] TTL / Imgh<1.5 First embodiment 6.69 / 4.8 1.39 Second embodiment 6.68 / 4.8 1.39 Third embodiment 6.69 / 4.8 1.39 Fourth embodiment 6.80 / 4.8 1.42 Fifth embodiment 6.80 / 4.8 1.42 Sixth embodiment 6.80 / 4.8 1.42 Seventh embodiment 6.80 / 4.8 1.42 Eighth embodiment 6.80 / 4.8 1.42 Ninth embodiment 6.80 / 4.8 1.42 Tenth embodiment 6.69 / 4.8 1.39 Eleventh embodiment 6.80 / 4.8 1.42 Twelfth embodiment 6.80 / 4.8 1.42

[0336] Table 22 shows the TTL / f values ​​of the optical systems of the first to twelfth embodiments. As can be seen from Table 22, each embodiment satisfies the condition: 1.0 <TTL / f<1.3。

[0337] Table 22

[0338]

[0339]

[0340] Table 23 shows the f / f1 values ​​of the optical systems of the first to twelfth embodiments. It can be seen from Table 23 that each embodiment satisfies the condition: 1.0 <f / f1<1.3。

[0341] Table 23

[0342] 1.0<f / f1<1.3 First embodiment 5.56 / 4.74 1.17 Second embodiment 5.56 / 4.72 1.18 Third embodiment 5.58 / 5.13 1.09 Fourth embodiment 5.79 / 5.08 1.14 Fifth embodiment 5.82 / 4.96 1.17 Sixth embodiment 5.74 / 5.01 1.15 Seventh embodiment 5.94 / 4.99 1.19 Eighth embodiment 5.62 / 5.15 1.09 Ninth embodiment 5.61 / 5.17 1.08 Tenth embodiment 5.54 / 5.18 1.11 Eleventh embodiment 5.61 / 5.19 1.09 Twelfth embodiment 5.67 / 5.20 1.14

[0343] Table 24 shows the (R9+R10) / (R9*R10) values ​​of the optical systems of the first to twelfth embodiments. It can be seen from Table 24 that each embodiment satisfies the condition: 0.2<(R9+R10) / (R9*R10)<0.65.

[0344] Table 24

[0345]

[0346]

[0347] Table 25 shows the (R1+R2) / f1 values ​​of the optical systems of the first to twelfth embodiments. It can be seen from Table 25 that each embodiment satisfies the condition: 2<(R1+R2) / f1<4.5.

[0348] Table 25

[0349] 2<(R1+R2) / f1<4.5 First embodiment (2.25+14.74) / 4.74 3.59 Second embodiment (2.28+17.27) / 4.72 4.15 Third embodiment (2.28+10.64) / 5.13 2.52 Fourth embodiment (2.40+15.26) / 5.08 3.48 Fifth embodiment (2.39+17.40) / 4.96 3.99 Sixth embodiment (2.39+16.38) / 5.01 3.75 Seventh embodiment (2.36+14.91) / 4.99 3.46 Eighth embodiment (2.45+16.65) / 5.15 3.71 Ninth embodiment (2.46+16.56) / 5.17 3.68 Tenth embodiment (2.27+11.42) / 5.00 2.74 Eleventh embodiment (2.45+16.21) / 5.17 3.61 Twelfth embodiment (2.39+16.73) / 5.99 3.83

[0350] Table 26 shows the R3 / R4 values ​​of the optical systems of the first to twelfth embodiments. It can be seen from Table 26 that each embodiment satisfies the condition: 1.5 <R3 / R4<3.5。

[0351] Table 26

[0352]

[0353]

[0354] Table 27 shows the (R5+R6) / (R5-R6) values ​​of the optical systems of the first to twelfth embodiments. It can be seen from Table 27 that each embodiment satisfies the condition: -100<(R5+R6) / (R5-R6)<180.

[0355] Table 27

[0356] -100<(R5+R6) / (R5-R6)<180 First embodiment (3.67+3.78) / (3.67-3.78) -64.35 Second embodiment (3.98+3.93) / (3.98-3.93) 172.74 Third embodiment (4.08+4.37) / (4.08-4.37) -28.60 Fourth embodiment (4.53+4.34) / (4.53-4.34) 48.25 Fifth embodiment (5.16+5.28) / (5.16-5.28) -87.47 Sixth embodiment (6.30+6.15) / (6.30-6.15) 85.43 Seventh embodiment (6.38+6.24) / (6.38-6.24) 95.06 Eighth embodiment (6.36+5.57) / (6.36-5.57) 15.23 Ninth embodiment (6.45+5.6) / (6.45-5.6) 14.24 Tenth embodiment (4.12+4.25) / (4.12-4.25) -66.14 Eleventh embodiment (6.66+5.67) / (6.66-5.67) 12.45 Twelfth embodiment (6.44+6.13) / (6.44-6.13) 40.91

[0357] Table 28 shows the f1 / f2 values ​​of the optical systems of the first to twelfth embodiments. It can be seen from Table 28 that each embodiment satisfies the condition: -0.6 <f1 / f2<-0.3。

[0358] Table 28

[0359] -0.6<f1 / f2<-0.3 First embodiment 4.74 / -9.91 -0.48 Second embodiment 4.72 / -9.25 -0.51 Third embodiment 5.13 / -9.92 -0.52 Fourth embodiment 5.08 / -10.05 -0.51 Fifth embodiment 4.96 / -8.68 -0.57 Sixth embodiment 5.01 / -8.99 -0.56 Seventh embodiment 4.99 / -9.18 -0.54 Eighth embodiment 5.15 / -9.82 -0.52 Ninth embodiment 5.17 / -9.93 -0.52 Tenth embodiment 5.00 / -10.47 -0.48 Eleventh embodiment 5.17 / -10.02 -0.52 Twelfth embodiment 4.99 / -9.03 -0.55

[0360] Table 29 shows the (R13*R14) / (R13-R14) values ​​of the optical systems of the first to twelfth embodiments. It can be seen from Table 29 that each embodiment satisfies the condition: 1.5<(R13*R14) / (R13-R14)<3.5.

[0361] Table 29

[0362] 1.5<(R13*R14) / (R13-R14)<3.5 First embodiment (-3.66*2.86) / (-3.66-2.86) 1.61 Second embodiment (8.29*2.15) / (8.29-2.15) 2.90 Third embodiment (-7.34*2.34) / (-7.34-2.34) 1.78 Fourth embodiment (8.8*2.22) / (8.8-2.22) 2.96 Fifth embodiment (19.17*2.49) / (19.17-2.49) 2.87 Sixth embodiment (42.03*2.53) / (42.03-2.53) 2.69 Seventh embodiment (46.17*2.4) / (46.17-2.4) 2.53 Eighth embodiment (4388.69*2.73) / (4388.69-2.73) 2.73 Ninth embodiment (-124.62*2.78) / (-124.62-2.78) 2.72 Tenth embodiment (-3.95*2.85) / (-3.95-2.85) 1.65 Eleventh embodiment (-104.29*2.81) / (-104.29-2.81) 2.74 Twelfth embodiment (44.98*2.58) / (44.98-2.58) 2.73

[0363] Table 30 shows the ΣCT / f values ​​of the optical systems of the first to twelfth embodiments. It can be seen from Table 30 that each embodiment satisfies the condition: 0.5<ΣCT / f<0.7

[0364] Table 30

[0365] 0.5<ΣCT / f<0.7 First embodiment 3.59 / 5.56 0.65 Second embodiment 3.39 / 5.56 0.61 Third embodiment 3.50 / 5.58 0.63 Fourth embodiment 3.31 / 5.79 0.57 Fifth embodiment 3.45 / 5.82 0.59 Sixth embodiment 3.35 / 5.74 0.58 Seventh embodiment 3.39 / 5.94 0.57 Eighth embodiment 3.49 / 5.62 0.62 Ninth embodiment 3.49 / 5.61 0.62 Tenth embodiment 3.57 / 5.54 0.64 Eleventh embodiment 3.44 / 5.61 0.61 Twelfth embodiment 3.33 / 5.67 0.59

[0366] Table 31 shows the ΣCT / TTL values ​​of the optical systems of the first to twelfth embodiments. It can be seen from Table 31 that each embodiment satisfies the condition: 0.4<ΣCT / TTL<0.6

[0367] Table 31

[0368] 0.4<ΣCT / TTL<0.6 First embodiment 3.59 / 6.69 0.54 Second embodiment 3.39 / 6.68 0.51 Third embodiment 3.50 / 6.69 0.52 Fourth embodiment 3.31 / 6.8 0.49 Fifth embodiment 3.45 / 6.8 0.51 Sixth embodiment 3.35 / 6.8 0.49 Seventh embodiment 3.39 / 6.8 0.50 Eighth embodiment 3.49 / 6.8 0.51 Ninth embodiment 3.49 / 6.8 0.51 Tenth embodiment 3.57 / 6.69 0.53 Eleventh embodiment 3.44 / 6.80 0.51 Twelfth embodiment 3.33 / 6.80 0.49

[0369] Table 32 shows the ET1 / CT1 values ​​of the optical systems of the first to twelfth embodiments. It can be seen from Table 32 that each embodiment meets the condition: 0.25 <ET1 / CT1<0.55

[0370] Table 32

[0371] 0.25<ET1 / CT1<0.55 First embodiment 0.32 / 1.01 0.32 Second embodiment 0.28 / 0.94 0.30 Third embodiment 0.32 / 0.94 0.34 Fourth embodiment 0.30 / 0.96 0.32 Fifth embodiment 0.29 / 0.98 0.29 Sixth embodiment 0.29 / 0.96 0.31 Seventh embodiment 0.32 / 1.04 0.31 Eighth embodiment 0.30 / 0.90 0.33 Ninth embodiment 0.30 / 0.89 0.34 Tenth embodiment 0.29 / 0.90 0.32 Eleventh embodiment 0.38 / 0.88 0.43 Twelfth embodiment 0.44 / 0.91 0.49

[0372] Table 33 shows the ET5 / CT5 values ​​of the optical systems of the first to twelfth embodiments. It can be seen from Table 33 that each embodiment satisfies the condition: 1.0 <ET5 / CT5<1.6

[0373] Table 33

[0374]

[0375]

[0376] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of the rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made in accordance with the claims of the present invention are still within the scope of the invention.

Claims

1. An optical system, characterized in that: There are seven lenses with refractive power, including the following from the object side to the image side along the optical axis: a first lens having positive refractive power, wherein the object-side surface of the first lens is convex, and the image-side surface of the first lens at the optical axis is concave; a second lens having negative refractive power, wherein the object-side surface of the second lens is convex and the image-side surface is concave; a third lens having refractive power, wherein the object-side surface of the third lens at the optical axis is convex, and the image-side surface of the third lens at the optical axis is concave; The fourth lens has refractive power; a fifth lens element having refractive power, wherein the object-side surface of the fifth lens element at the optical axis is convex, and the image-side surface of the fifth lens element at the optical axis is concave; a sixth lens element having refractive power, wherein the object-side surface of the sixth lens element at the optical axis is convex; a seventh lens element having negative refractive power, wherein the image-side surface of the seventh lens element at the optical axis is concave; The optical system further includes a stop, and the optical system satisfies the conditional formula: 1.5 <TTL / D<2.5; 1.39≤TTL / Imgh≤1.42; 1.68≤Fno<2; 0.25 <ET1 / CT1<0.55; Wherein, TTL is the distance from the object side surface of the first lens to the imaging plane of the optical system on the optical axis; D is the aperture size of the aperture, Imgh is half the diagonal length of the effective pixel area on the imaging plane of the optical system, Fno is the aperture number of the optical system, ET1 is the edge thickness of the first lens, and CT1 is the center thickness of the first lens.

2. The optical system according to claim 1, wherein The optical system satisfies the conditional formula: 0.6 <L / Imgh<0.8; Wherein, L is the aperture diameter of the first lens.

3. The optical system according to claim 1, wherein The optical system satisfies the conditional formula: 1 <f14 / f≤1.30; Wherein, f14 is the combined focal length of the first lens, the second lens, the third lens and the fourth lens, and f is the effective focal length of the optical system.

4. The optical system according to claim 1, wherein The optical system satisfies the conditional formula: Fno / TTL<0.

29.

5. The optical system according to claim 1, wherein The optical system satisfies the conditional formula: 1.14 <TTL / f<1.3; Wherein, f is the effective focal length of the optical system.

6. The optical system according to claim 1, wherein The optical system satisfies the conditional formula: 1.0 <f / f1<1.3; Wherein, f1 is the effective focal length of the first lens, and f is the effective focal length of the optical system.

7. The optical system according to claim 1, wherein The optical system satisfies the conditional formula: 0.2<(R9+R10) / (R9*R10)<0.65; Wherein, R9 is the curvature radius of the object side surface of the fifth lens, and R10 is the curvature radius of the image side surface of the fifth lens.

8. The optical system according to claim 1, wherein: The optical system satisfies the conditional formula: 2<(R1+R2) / f1<4.5; Wherein, R1 is the radius of curvature of the object side surface of the first lens, R2 is the radius of curvature of the image side surface of the first lens, and f1 is the effective focal length of the first lens.

9. The optical system according to claim 1, wherein: The optical system satisfies the conditional formula: 2.1≤R3 / R4<3.5; Wherein, R3 is the curvature radius of the object side surface of the second lens, and R4 is the curvature radius of the image side surface of the second lens.

10. The optical system according to claim 1, wherein The optical system satisfies the conditional formula: -100<(R5+R6) / (R5-R6)<180; Among them, R5 is the curvature radius of the object side surface of the third lens, and R6 is the curvature radius of the image side surface of the third lens.

11. The optical system according to claim 1, wherein The optical system satisfies the conditional formula: -0.6 <f1 / f2<-0.3; Wherein, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens.

12. The optical system according to claim 1, wherein The optical system satisfies the conditional formula: 1.5<(R13*R14) / (R13-R14)<3.5; Among them, R13 is the curvature radius of the object side surface of the seventh lens, and R14 is the curvature radius of the image side surface of the seventh lens.

13. The optical system according to claim 1, wherein The optical system satisfies the conditional formula: 0.5<ΣCT / f<0.7; Wherein, ΣCT is the sum of the center thicknesses of the lenses of the optical system at the optical axis, and f is the effective focal length of the optical system.

14. The optical system according to claim 1, wherein The optical system satisfies the conditional formula: 0.4<ΣCT / TTL<0.6; Where ΣCT is the sum of the center thicknesses of all lenses in the optical system at the optical axis.

15. The optical system according to claim 1, wherein The optical system satisfies the conditional formula: 0.29≤ET1 / CT1≤0.

49.

16. The optical system according to claim 1, wherein The optical system satisfies the conditional formula: 1.0 <ET5 / CT5<1.6; Wherein, ET5 is the edge thickness of the fifth lens, and CT5 is the center thickness of the fifth lens.

17. A lens module, characterized in that: The optical system comprises a lens barrel and the optical system according to any one of claims 1 to 16, wherein the first lens to the seventh lens of the optical system are installed in the lens barrel.

18. An electronic device, characterized in that: It includes a shell, an electronic photosensitive element and a lens module as described in claim 17, wherein the lens module and the electronic photosensitive element are arranged in the shell, and the electronic photosensitive element is arranged on the imaging surface of the optical system, and is used to convert the light of the object passing through the first lens to the seventh lens and incident on the electronic photosensitive element into an electrical signal of an image.

Images