Optical systems, camera modules and electronic equipment

Abstract

The present application relates to an optical system, a camera module, and an electronic device. The optical system includes: a first lens with positive refractive power, whose object side surface is convex at the near optical axis and whose image side surface is concave at the near optical axis; a second lens with negative refractive power, whose object side surface is convex at the near optical axis and whose image side surface is concave at the near optical axis; a third lens; a fourth lens; a fifth lens; a sixth lens with negative refractive power, whose image side surface is concave at the near optical axis; a seventh lens with positive refractive power, whose object side surface is convex at the near optical axis, and whose object side surface and image side surface are both aspherical, and at least one of the surfaces has recurvature; an eighth lens with negative refractive power, whose image side surface is concave at the near optical axis, and whose object side surface and image side surface are both aspherical, and at least one of the surfaces has recurvature; the optical system satisfies the relationship: 2.5<f678 / f6<8.5. The above optical system can maintain good imaging quality while achieving miniaturization.

Description

Technical Field

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

[0002] With the rapid popularization of electronic devices such as smartphones, smart watches, and tablets in the consumer market, the camera performance of electronic devices has also received significant attention from the market. For example, the highlights of new product launches by well-known companies mostly revolve around the camera performance of the devices.

[0003] To enhance the camera performance of a device, a multi-lens design is typically used to improve image quality. However, as the number of lenses increases, various problems within the optical system gradually emerge. For example, a larger number of lenses increases system size, while poor refractive power design of some lenses can also lead to increased sensitivity and, in turn, unstable image quality. Therefore, finding a way to rationally design optical systems that balance miniaturization and image quality improvement is undoubtedly a significant challenge and opportunity for the industry. Summary of the Invention

[0004] Based on this, it is necessary to provide an optical system, a camera module and an electronic device to address the problem of how to achieve both miniaturization and good imaging quality.

[0005] An optical system, comprising, in order from the object side to the image side along the optical axis:

[0006] a first lens having positive refractive power, wherein the object-side surface of the first lens is convex near the optical axis and the image-side surface of the first lens is concave near the optical axis;

[0007] a second lens having negative refractive power, wherein the object-side surface of the second lens is convex near the optical axis and the image-side surface of the second lens is concave near the optical axis;

[0008] a third lens having refractive power;

[0009] a fourth lens having refractive power;

[0010] a fifth lens having refractive power;

[0011] a sixth lens element having negative refractive power, wherein the image-side surface of the sixth lens element is concave near the optical axis;

[0012] a seventh lens element having positive refractive power, wherein the object-side surface of the seventh lens element is convex near the optical axis, and both the object-side surface and the image-side surface of the seventh lens element are aspherical, and at least one of the surfaces is recurved;

[0013] an eighth lens element having negative refractive power, wherein the image-side surface of the eighth lens element is concave near the optical axis, and both the object-side surface and the image-side surface of the eighth lens element are aspherical, and at least one of the surfaces is recurved;

[0014] The optical system also satisfies the relationship:

[0015] 2.5<f678 / f6<8.5;

[0016] f678 is the combined focal length of the sixth lens, the seventh lens, and the eighth lens, and f6 is the effective focal length of the sixth lens.

[0017] In the above optical system, by making the first lens have positive refractive power and satisfying the above surface design, it will be beneficial to make the image-side focal position of the first lens closer to the object side, thereby facilitating the compression of the length of the optical system; and by making the second lens have negative refractive power and have a surface configuration similar to that of the first lens, it can reasonably cooperate with the first lens to reasonably reduce the incident angle of the light of each field of view when passing through the optical surfaces of the first lens and the second lens, so that the incident light can achieve a relatively smooth transition when passing through the first lens and the second lens, thereby effectively avoiding the generation of large aberrations and reducing the influence of the image-side lens on the correction of aberrations. The burden is reduced, thereby improving the design freedom of the image-side lens; by arranging the third lens, the fourth lens, and the fifth lens, the light emitted by the second lens can be adjusted in sequence through a sufficient number of optical surfaces, that is, there is a sufficiently long adjustment space, which is conducive to suppressing the degree of deflection of the incident light in the optical system; further, through the alternating refractive power and surface design of the sixth lens, the seventh lens, and the eighth lens, it is possible to ultimately adjust the light that is about to converge on the imaging surface, further suppressing the degree of deflection of light incident at a large angle before reaching the imaging surface, thereby effectively suppressing off-axis aberrations such as field curvature, astigmatism, and distortion. Furthermore, when the optical system satisfies the aforementioned relationship, the combined focal length of the sixth lens element, the seventh lens element, and the eighth lens element closest to the image side of the optical system can be reasonably configured with respect to the effective focal length of the sixth lens element. This can help reduce the deflection angle of light in the peripheral field of view and reduce the sensitivity of incident light to the sixth through eighth lenses, thereby reasonably correcting aberrations generated by the object-side lenses and improving the imaging quality of the optical system. Furthermore, since the refractive power strength of the sixth lens element can be reasonably configured, this not only helps to shorten the length of the optical system but also reduces the refractive power burden of the sixth lens element, thereby lowering the difficulty in molding the sixth lens element and improving the machinability of the sixth lens element.

[0018] In one embodiment, the optical system satisfies the relationship:

[0019] ImgH / FNO>2.9;

[0020] ImgH is half of the image height corresponding to the maximum field of view angle of the optical system, and FNO is the aperture number of the optical system. When this relationship is satisfied, it is not only beneficial for the optical system to obtain a larger image surface, but also beneficial for the optical system to obtain a compact structure, so that the imaging characteristics of miniaturization, large image surface, and high pixel can be taken into account. Furthermore, when the optical system with the above refractive power and surface design satisfies FNO < 1.85, the image surface size of the optical system can be matched with the aperture number while further having a large aperture characteristic, and sufficient luminous flux can still be obtained in a darker weather environment, thereby ensuring higher imaging quality.

[0021] In one embodiment, the optical system satisfies the relationship:

[0022] TTL / ImgH<1.4;

[0023] TTL is the distance along the optical axis from the object-side surface of the first lens to the imaging plane of the optical system, and ImgH is half the image height corresponding to the maximum field of view of the optical system. Meeting this relationship not only reduces the overall length of the optical system and reduces sensitivity, but also allows the optical system to achieve a compact design while maintaining a large image plane, enabling it to match higher-pixel image sensors and capture clearer details.

[0024] In one embodiment, the optical system satisfies the relationship:

[0025] 5<f345 / f12<15;

[0026] f12>0;

[0027] f345 is the combined focal length of the third, fourth, and fifth lenses, and f12 is the combined focal length of the first and second lenses. Satisfying this relationship improves the field curvature and distortion aberrations of the optical system, balancing the aberrations of the optical system and achieving good imaging quality. When the relationship is above the upper limit, the total positive refractive power provided by the lens group consisting of the third through fifth lenses is too small to balance the aberrations generated by the front and rear lenses, ultimately reducing imaging quality. At the same time, the lens group consisting of the first and second lenses provides excessive positive refractive power, increasing the sensitivity of the optical system and hindering system miniaturization and large image plane characteristics. When the relationship is below the lower limit, the total positive refractive power provided by the lens group consisting of the third through fifth lenses is too large, easily overcorrecting the aberrations generated by the object-side lens and increasing the correction burden on the image-side lens.

[0028] In one embodiment, the optical system satisfies the relationship:

[0029] 1.5<(f1+|f2|) / (r12+r22)<3;

[0030] f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, r12 is the radius of curvature of the image-side surface of the first lens at the optical axis, and r22 is the radius of curvature of the image-side surface of the second lens at the optical axis. When this relationship is satisfied, the shapes and refractive power contributions of the first and second lenses can be appropriately constrained. This not only helps prevent excessive lens surface curvature, thereby improving aberration balance, but also helps shorten the overall system length and achieve large aperture characteristics.

[0031] In one embodiment, the optical system satisfies the relationship:

[0032] ct37 / et37<1.4;

[0033] ct37 is the sum of the thicknesses of each lens from the third through the seventh lens along the optical axis, and et37 is the sum of the distances from the maximum effective aperture on the object side to the maximum effective aperture on the image side along the optical axis. Meeting this relationship helps shorten the overall system length and achieve a compact structure between the third through seventh lenses. At the same time, the center and edge thicknesses of each lens are properly configured, facilitating a uniform size distribution and ensuring stability in subsequent lens assembly. Above the upper limit of this relationship, the sum of the center and edge thicknesses of each lens from the third through the seventh lens differs significantly, potentially increasing system sensitivity and reducing assembly stability, making it impossible to guarantee good image quality.

[0034] In one embodiment, the optical system satisfies the relationship:

[0035] 2<f / (sd82-sd11)<2.5;

[0036] f is the effective focal length of the optical system, sd11 is half the maximum effective aperture of the object-side surface of the first lens, and sd82 is half the maximum effective aperture of the image-side surface of the eighth lens. When this relationship is satisfied, the difference in aperture between the first and eighth lenses can be reasonably constrained, enabling the optical system to obtain a larger image surface. This also helps shorten the overall system length and achieve a compact design. Below the lower limit of the relationship, the difference in aperture between the first and eighth lenses is too large, increasing the deflection angle of light rays from the edge of the field of view relative to the optical axis when they emerge from the eighth lens. This can easily lead to insufficient relative illumination in the imaging area corresponding to the edge of the field of view, resulting in edge vignetting during imaging. Above the upper limit, however, this is detrimental to shortening the overall system length and expanding the image surface, and can also result in an excessively small field of view angle.

[0037] In one embodiment, the optical system satisfies the relationship:

[0038] 5.5<(r62+r71) / (|sag62|+|sag71|)<7.5;

[0039] r62 is the radius of curvature of the image side surface of the sixth lens at the optical axis, r71 is the radius of curvature of the object side surface of the seventh lens at the optical axis, sag62 is the sag height of the image side surface of the sixth lens at the maximum effective aperture, and sag71 is the sag height of the object side surface of the seventh lens at the maximum effective aperture. Satisfying this relationship helps constrain the shapes of the image side surface of the sixth lens and the object side surface of the seventh lens, ensuring a reasonable match between the center and edge profiles of the two optical surfaces. This helps balance system coma, improves the processability of the two lenses, and enhances the imaging quality of the optical system. When the relationship is below the lower limit, the shapes of the two lenses are too curved, reducing manufacturing feasibility and easily introducing stray light, increasing the risk of ghost images. When the relationship is above the upper limit, the edge curvature of the two optical surfaces is insufficient, which is not conducive to a smooth transition of light rays at the edge of the field of view, resulting in a weakened aberration correction capability of the overall optical system.

[0040] In one embodiment, the optical system satisfies the relationship:

[0041] 1.7<ct78 / ct23<2.0;

[0042] ct23 is the distance along the optical axis from the image side of the second lens to the object side of the third lens, and ct78 is the distance along the optical axis from the image side of the seventh lens to the object side of the eighth lens. When this relationship is satisfied, the gaps between the second and third lenses, as well as the gaps between the seventh and eighth lenses, can be reasonably constrained, thereby improving the manufacturing and assembly feasibility of the optical system, shortening the overall system length, and enhancing image quality in the central field of view.

[0043] In one embodiment, the optical system satisfies the relationship:

[0044] 0.6<(|sag81|-|sag72|) / et78<1.6;

[0045] sag72 is the sag height of the image-side surface of the seventh lens element at its maximum effective aperture, sag81 is the sag height of the object-side surface of the eighth lens element at its maximum effective aperture, and et78 is the distance along the optical axis from the maximum effective aperture of the image-side surface of the seventh lens element to the maximum effective aperture of the object-side surface of the eighth lens element. Meeting this relationship facilitates controlling the sag heights of the image-side surface of the seventh lens element and the object-side surface of the eighth lens element, as well as the gap therebetween. This in turn reduces the deflection angle of marginal light rays passing through the two optical surfaces, facilitating a smooth transition of marginal field light rays to the image plane. This also suppresses vignetting at the edge of the image plane, thereby improving the resolution of the optical system.

[0046] In one embodiment, the optical system includes a vignetting stop disposed between the second lens and the third lens, and the optical system satisfies the relationship:

[0047] 0.5<sds / (sd81-sd31)<0.8;

[0048] sds is the maximum effective aperture of the vignetting stop, sd31 is the maximum effective aperture of the object-side surface of the third lens, and sd81 is the maximum effective aperture of the object-side surface of the eighth lens. sd81-sd31 represents the step difference between the third and eighth lenses. When this relationship is satisfied, the aperture of the vignetting stop between the second and third lenses and this step difference are properly configured, allowing light from the edge of the field of view to reach the eighth lens and further onto the imaging plane at a reasonable propagation angle after passing through the vignetting stop. This design not only increases the image plane size and shortens the overall length of the optical system, but also facilitates increasing the aperture, boosting light throughput, and improving imaging quality in dark environments. It also helps control the aperture difference between lenses, avoiding excessive variations in the apertures of adjacent lenses and reducing design pressure on the lens barrel.

[0049] In one embodiment, the optical system satisfies the relationship:

[0050] 9.5<zh78 / zb78<12.2;

[0051] zh78 is the maximum distance along the optical axis from the image side of the seventh lens to the object side of the eighth lens, and zb78 is the shortest distance along the optical axis from the image side of the seventh lens to the object side of the eighth lens. When this relationship is satisfied, the curvature between the seventh and eighth lenses can be properly controlled. This not only helps ensure that the eighth lens has sufficient twist to match the seventh lens to correct system aberrations, but also reduces the deflection angle of marginal rays passing through the seventh and eighth lenses, thereby improving image quality. It also ensures that there is a sufficient air gap between the seventh and eighth lenses to meet molding and assembly requirements.

[0052] In one embodiment, the optical system satisfies the relationship:

[0053] 4.2<zh67 / zb67<7.5;

[0054] zh67 is the maximum distance along the optical axis from the image-side surface of the sixth lens to the object-side surface of the seventh lens, and zb67 is the shortest distance along the optical axis from the image-side surface of the sixth lens to the object-side surface of the seventh lens. When this relationship is satisfied, the gap between the sixth and seventh lenses is properly distributed, with the difference between the maximum and minimum gaps being neither too large nor too small. This, on the one hand, allows the profiles of the image-side surface of the sixth lens and the object-side surface of the seventh lens to be aligned, thereby improving aberration balance and resolving power of the optical system while also reducing ghost images and stray light. It also helps shorten the overall length of the system and avoid assembly problems caused by close distances between the lenses.

[0055] In one embodiment, the optical system includes a vignetting stop disposed between the second lens and the third lens, and the optical system satisfies the relationship:

[0056] 0.64<|jd22| / 45°<0.67;

[0057] jd22 is the maximum acute angle formed between the tangent plane at each position on the image-side surface of the second lens and a plane perpendicular to the optical axis. The image-side surface of the second lens is the adjacent optical surface located on the object side of the vignetting stop. Incident light is highly sensitive to the shape of this surface. Keeping the above ratio within a reasonable range can effectively control the complexity of this surface, reduce sensitivity, and improve the imaging quality of the optical system. It also reduces the difficulty of molding the second transparent element and improves the yield rate.

[0058] In one embodiment, the optical system includes a vignetting stop disposed between the second lens and the third lens, and the optical system satisfies the relationship:

[0059] 0.41<|jd31| / 45°<0.51;

[0060] jd31 is the maximum acute angle formed by the tangent plane at each position on the object-side surface of the third lens and a plane perpendicular to the optical axis. The object-side surface of the third lens is the adjacent optical surface located on the image side of the vignetting stop. Light deflects on this surface, and light from the central field of view and the peripheral field of view begin to separate in space. Therefore, incident light is more sensitive to this surface. Therefore, by satisfying this relationship condition, the maximum inclination angle of the object-side surface of the third lens is reduced, reducing the complexity of the surface shape, thereby improving the overall yield and imaging quality of the optical system and reducing the difficulty of lens molding.

[0061] A camera module comprises an image sensor and any one of the above optical systems, wherein the image sensor is disposed on the image side of the optical system. By adopting the above optical system, the camera module can achieve a compact design while maintaining good imaging quality.

[0062] An electronic device includes a fixing member and the camera module, wherein the camera module is mounted on the fixing member. The electronic device can be equipped with the camera module in a smaller space, thereby reducing the thickness of the device while maintaining good camera performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 A schematic structural diagram of an optical system provided in the first embodiment of the present application;

[0064] Figure 2 including a longitudinal spherical aberration diagram, an astigmatism diagram, and a distortion diagram of the optical system in the first embodiment;

[0065] Figure 3 A schematic structural diagram of an optical system provided in the second embodiment of the present application;

[0066] Figure 4 including a longitudinal spherical aberration diagram, an astigmatism diagram, and a distortion diagram of the optical system in the second embodiment;

[0067] Figure 5 A schematic structural diagram of an optical system provided in the third embodiment of the present application;

[0068] Figure 6 including a longitudinal spherical aberration diagram, an astigmatism diagram, and a distortion diagram of the optical system in the third embodiment;

[0069] Figure 7 A schematic structural diagram of an optical system provided in a fourth embodiment of the present application;

[0070] Figure 8 including a longitudinal spherical aberration diagram, an astigmatism diagram, and a distortion diagram of the optical system in the fourth embodiment;

[0071] Figure 9 A schematic structural diagram of an optical system provided in a fifth embodiment of the present application;

[0072] Figure 10 including a diagram of longitudinal spherical aberration, a diagram of astigmatism, and a diagram of distortion of the optical system in the fifth embodiment;

[0073] Figure 11 A schematic structural diagram of an optical system provided in a sixth embodiment of the present application;

[0074] Figure 12 including a longitudinal spherical aberration diagram, an astigmatism diagram, and a distortion diagram of the optical system in the sixth embodiment;

[0075] Figure 13 A schematic structural diagram of an optical system provided in a seventh embodiment of the present application;

[0076] Figure 14 including a longitudinal spherical aberration diagram, an astigmatism diagram, and a distortion diagram of the optical system in the seventh embodiment;

[0077] Figure 15 A schematic diagram of a camera module provided in one embodiment of the present application;

[0078] Figure 16 A schematic diagram of the structure of an electronic device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0079] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0080] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "thickness", "top", "front", "rear", "axial", "radial", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0081] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0082] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0083] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element.

[0084] refer to Figure 1 An embodiment of the present application provides an optical system 10 having an eight-lens structure. The optical system 10 includes, from the object side to the image side along an optical axis 101, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8. The first lens L1 has positive refractive power, the second lens L2 has negative refractive power, the sixth lens L6 has negative refractive power, the seventh lens L7 has positive refractive power, and the eighth lens L8 has negative refractive power. The optical axes of the lenses in the optical system 10 are aligned on a straight line, which is the optical axis 101 of the optical system 10. The lenses in the optical system 10 can be assembled into a lens barrel to form a camera lens.

[0085] The first lens L1 has an object-side surface S1 and an image-side surface S2; the second lens L2 has an object-side surface S3 and an image-side surface S4; the third lens L3 has an object-side surface S5 and an image-side surface S6; the fourth lens L4 has an object-side surface S7 and an image-side surface S8; the fifth lens L5 has an object-side surface S9 and an image-side surface S10; the sixth lens L6 has an object-side surface S11 and an image-side surface S12; the seventh lens L7 has an object-side surface S13 and an image-side surface S14; and the eighth lens L8 has an object-side surface S15 and an image-side surface S16. In addition, the optical system 10 also has an imaging surface S17, which is located on the image side of the eighth lens L8. After adjustment by the various lenses of the optical system 10, an on-axis object point can converge onto the imaging surface S17. Generally, the imaging surface S17 of the optical system 10 coincides with the photosensitive surface of the image sensor. For ease of understanding, after the optical system 10 is assembled with the image sensor, the imaging surface S17 can also be considered the photosensitive surface of the image sensor.

[0086] In the embodiment of the present application, the object-side surface S1 of the first lens element L1 is convex at the near optical axis, and the image-side surface S2 is concave at the near optical axis; the object-side surface S3 of the second lens element L2 is convex at the near optical axis, and the image-side surface S4 is concave at the near optical axis; the image-side surface S12 of the sixth lens element L6 is concave at the near optical axis; the object-side surface S13 of the seventh lens element L7 is convex at the near optical axis, and both the object-side surface S13 and the image-side surface S14 of the seventh lens element L7 are aspherical surfaces, and at least one of the object-side surface S13 and the image-side surface S14 is recurved; the image-side surface S16 of the eighth lens element L8 is concave at the near optical axis, and both the object-side surface S15 and the image-side surface S16 of the eighth lens element L8 are aspherical surfaces, and at least one of the object-side surface S15 and the image-side surface S16 is recurved. It should be noted that when a lens surface is described as having a certain surface shape near the optical axis, that is, the lens surface has this surface shape near the optical axis 101, and the area of ​​the lens surface radially near the maximum effective aperture can have the same surface shape or an opposite surface shape. When the same lens surface has two opposite surface shapes, it can be said that the surface has recurvature.

[0087] In the above optical system 10, by making the first lens L1 have positive refractive power and satisfying the above surface design, it will be beneficial to make the image-side focal position of the first lens L1 closer to the object side, thereby facilitating the compression of the length of the optical system 10; and by making the second lens L2 have negative refractive power and have a surface configuration similar to that of the first lens L1, it can reasonably cooperate with the first lens L1 to reasonably reduce the incident angle of the light of each field of view when passing through the optical surfaces of the first lens L1 and the second lens L2, so that the incident light can achieve a relatively smooth transition when passing through the first lens L1 and the second lens L2, thereby effectively avoiding the generation of large aberrations and reducing the influence of the image-side lens on the correction of aberrations. The third lens L3, the fourth lens L4, and the fifth lens L5 are provided so that the light emitted by the second lens L2 can be adjusted sequentially through a sufficient number of optical surfaces, that is, a sufficiently long adjustment space is provided, which is conducive to suppressing the degree of deflection of the incident light in the optical system 10. Furthermore, through the alternating refractive power and surface design of the sixth lens L6, the seventh lens L7, and the eighth lens L8, it is possible to ultimately adjust the light that is about to converge on the imaging surface S17, further suppressing the degree of deflection of light incident at a large angle before reaching the imaging surface S17, thereby effectively suppressing off-axis aberrations such as field curvature, astigmatism, and distortion.

[0088] Furthermore, based on the aforementioned number, refractive power, and surface design, the optical system 10 further satisfies the relationship: 2.5 < f678 / f6 < 8.5; f678 is the combined focal length of the sixth lens element L6, the seventh lens element L7, and the eighth lens element L8, and f6 is the effective focal length of the sixth lens element L6. When the optical system 10 further satisfies this relationship, the combined focal length of the sixth lens element L6, the seventh lens element L7, and the eighth lens element L8, which are closest to the image side of the optical system 10, is optimally aligned with the effective focal length of the sixth lens element L6. This helps mitigate the deflection angle of light in the peripheral field of view and reduces the sensitivity of incident light to the sixth through eighth lenses L6, L8. This effectively corrects aberrations generated by the object-side lenses and improves the imaging quality of the optical system 10. Furthermore, the optimal refractive power of the sixth lens element L6 not only helps reduce the length of the optical system 10 but also reduces the refractive power burden of the sixth lens element L6, easing the molding difficulty of the sixth lens element L6 and improving its processability. In some embodiments, the relationship satisfied by the optical system 10 may specifically be 2.7, 2.85, 2.94, 3.18, 3.3, 4.6, 5.9, 6.7, 7.5, 7.8, or 8.0.

[0089] Furthermore, in some embodiments, the optical system 10 satisfies the relationship: -10.69 mm ≤ f6 ≤ -7.572 mm. By further limiting the refractive power of the sixth lens element L6, the combined refractive power of the sixth through eighth lenses L6 through L8 can be better coordinated, further mitigating the deflection angle of light rays in the peripheral field of view as they pass through the rear lens group in the optical system 10, reducing the sensitivity of incident light rays to the rear lens group, and thereby facilitating further correction of system aberrations.

[0090] In addition, in some embodiments, the optical system 10 further satisfies at least one of the following relationships and related aperture settings, and when any of the relationships is satisfied, corresponding technical effects can be achieved:

[0091] ImgH / FNO>2.9mm; ImgH is half of the image height corresponding to the maximum field of view angle of the optical system 10, and FNO is the aperture number of the optical system 10. ImgH can also be called the maximum imaging circle radius of the optical system 10, and in some embodiments, when the optical system 10 is assembled with an image sensor, half of the diagonal length of the rectangular effective pixel area on the image sensor is equal to or approximately equal to the value of ImgH. When this relationship is satisfied, it is not only beneficial for the optical system 10 to obtain a larger image surface, but also beneficial for the optical system 10 to obtain a compact structure, thereby taking into account the imaging characteristics of miniaturization, large image surface, and high pixel count. In some embodiments, the relationship satisfied by the optical system 10 can specifically be 3, 3.15, 3.26, 3.3, 3.35, 3.45, 3.49, 3.57, 3.63 or 3.70, and the numerical unit is mm. Furthermore, when the optical system 10 with the above-described refractive power and surface design satisfies an FNO < 1.85, it can ensure that the optical system 10 can still obtain sufficient luminous flux in relatively dim weather environments, thereby ensuring high imaging quality. In some embodiments, the FNO satisfied by the optical system 10 can specifically be 1.5, 1.53, 1.56, 1.6, 1.64, 1.68, 1.73, 1.77, or 1.82.

[0092] TTL / ImgH < 1.4; TTL is the distance from the object-side surface S1 of the first lens L1 to the imaging surface S17 of the optical system 10 on the optical axis 101, and ImgH is half the image height corresponding to the maximum field of view of the optical system 10. Meeting this relationship not only helps reduce the overall length of the optical system 10 and lowers sensitivity, but also allows the optical system 10 to achieve a compact design while also taking into account the large image surface characteristics, compatible with higher-pixel image sensors and capturing clearer details. In some embodiments, this relationship satisfied by the optical system 10 can be 1.28, 1.3, 1.33, 1.35, 1.37, or 1.39.

[0093] 6.99mm≤TTL≤7.7mm; TTL is the distance along optical axis 101 from the object-side surface S1 of first lens element L1 to the imaging surface S17 of optical system 10, i.e., the total optical length of optical system 10. When this relationship is satisfied, optical system 10 can maintain the aforementioned good imaging quality while keeping the total optical length of optical system 10 within a relatively small range, thereby achieving a compact design.

[0094] 5<f345 / f12<15 and f12>0; f345 is the combined focal length of the third lens L3, the fourth lens L4, and the fifth lens L5, and f12 is the combined focal length of the first lens L1 and the second lens L2. When this relationship is satisfied, it helps improve the field curvature and distortion aberrations of the optical system 10, balancing the aberrations of the optical system 10 and achieving good imaging quality. When the relationship is above the upper limit, the total positive refractive power provided by the lens group consisting of the third lens L3 through the fifth lens L5 is too small to balance the aberrations generated by the front and rear lenses, ultimately reducing imaging quality. At the same time, the lens group consisting of the first lens L1 and the second lens L2 provides excessive positive refractive power, increasing the sensitivity of the optical system 10 and hindering system miniaturization and large image area characteristics. When the relationship is below the lower limit, the total positive refractive power provided by the lens group consisting of the third lens L3 through the fifth lens L5 is too large, which can easily overcorrect the aberrations generated by the object-side lens and increase the correction burden on the image-side lens. In some embodiments, the f345 / f12 relationship satisfied by the optical system 10 may specifically be 7.2, 7.8, 8.5, 9.3, 9.9, 10.6, 11.0, 11.7, 12.6, or 13.2.

[0095] 1.5<(f1+|f2|) / (r12+r22)<3; f1 is the effective focal length of the first lens L1, f2 is the effective focal length of the second lens L2, r12 is the radius of curvature of the image-side surface S2 of the first lens L1 at the optical axis 101, and r22 is the radius of curvature of the image-side surface S4 of the second lens L2 at the optical axis 101. When this relationship is satisfied, the shapes and refractive power contributions of the first lens L1 and the second lens L2 can be reasonably constrained. This not only helps prevent excessive curvature of the lens surfaces, thereby improving aberration balance, but also helps shorten the overall system length and achieve large aperture characteristics. In some embodiments, this relationship satisfied by the optical system 10 can be 1.8, 1.95, 2.07, 2.15, 2.24, 2.37, 2.43, or 2.5.

[0096] ct37 / et37 < 1.4; ct37 is the sum of the thicknesses of each lens from the third lens L3 to the seventh lens L7 along the optical axis 101, and et37 is the sum of the distances from the maximum effective aperture on the object side to the maximum effective aperture on the image side along the optical axis of each lens from the third lens L3 to the seventh lens L7. Meeting this relationship helps shorten the overall system length and achieve a compact structure between the third lens L3 to the seventh lens L7. At the same time, the center and edge thicknesses of each lens are rationally configured, facilitating uniform size distribution and ensuring stability during subsequent lens assembly. When the value exceeds the upper limit of this relationship, the difference between the sum of the center and edge thicknesses of each lens from the third lens L3 to the seventh lens L7 is too large, which can increase system sensitivity and reduce assembly stability, making it impossible to ensure good image quality. In some embodiments, this relationship satisfied by the optical system 10 can be 1.25, 1.28, 1.3, 1.32, or 1.35.

[0097] 2.0<f / (sd82-sd11)<2.5; f is the effective focal length of optical system 10, sd11 is half the maximum effective aperture of the object-side surface S1 of first lens element L1, and sd82 is half the maximum effective aperture of the image-side surface S16 of eighth lens element L8. When this relationship is satisfied, the difference in aperture between first lens element L1 and eighth lens element L8 is reasonably constrained, enabling optical system 10 to obtain a larger image surface. This also helps shorten the overall system length and achieve a compact design. Below the lower limit of this relationship, the difference in aperture between first lens element L1 and eighth lens element L8 is too large, resulting in a larger deflection angle relative to the optical axis of light rays at the edge of the field of view when they exit from eighth lens element L8. This can easily lead to insufficient relative illumination in the imaging area corresponding to the edge of the field of view, resulting in vignetting at the edge of the field of view. Above the upper limit, this is detrimental to shortening the overall system length and expanding the image surface, and also results in an excessively small field of view angle. In some embodiments, the relationship satisfied by the optical system 10 may specifically be 2.1, 2.14, 2.19, 2.26, 2.3, 2.35, 2.4, or 2.43.

[0098] 5.5<(r62+r71) / (|sag62|+|sag71|)<7.5; r62 is the radius of curvature of the image-side surface S12 of the sixth lens element L6 at the optical axis 101, r71 is the radius of curvature of the object-side surface S13 of the seventh lens element L7 at the optical axis 101, sag62 is the sag height of the image-side surface S12 of the sixth lens element L6 at the maximum effective aperture, and sag71 is the sag height of the object-side surface S13 of the seventh lens element L7 at the maximum effective aperture. When this relationship is satisfied, it is beneficial to constrain the shapes of the image-side surface S12 of the sixth lens element L6 and the object-side surface S13 of the seventh lens element L7, so that the central surface shape and the edge surface shape of the two optical surfaces can be reasonably matched, thereby balancing the system coma, improving the processability of the two lenses, and enhancing the imaging quality of the optical system 10. When the value is below the lower limit of the relationship, the shapes of the two lenses are too curved, reducing manufacturing feasibility and easily introducing stray light, increasing the risk of ghost images. When the value is above the upper limit of the relationship, the edge curvature of the two optical surfaces is insufficient, which is not conducive to the smooth transition of light at the edge of the field of view, resulting in a weakened aberration correction capability of the overall optical system 10. In some embodiments, the relationship satisfied by the optical system 10 can be 5.9, 6.0, 6.3, 6.7, 6.9, or 7.1.

[0099] 1.7<ct78 / ct23<2.0; ct23 is the distance along optical axis 101 from the image-side surface S4 of second lens element L2 to the object-side surface S5 of third lens element L3, and ct78 is the distance along optical axis 101 from the image-side surface S14 of seventh lens element L7 to the object-side surface S15 of eighth lens element L8. When this relationship is satisfied, the gaps between second lens element L2 and third lens element L3, as well as the gaps between seventh lens element L7 and eighth lens element L8, can be reasonably constrained, thereby improving the manufacturing and assembly feasibility of optical system 10, shortening the overall system length, and enhancing image quality in the central field of view. In some embodiments, this relationship satisfied by optical system 10 can be 2, 2.04, 2.09, 2.15, 2.23, 2.27, or 2.3.

[0100] 0.6<(|sag81|-|sag72|) / et78<1.6; sag72 is the sag height of the image-side surface S14 of the seventh lens element L7 at the maximum effective aperture, sag81 is the sag height of the object-side surface S15 of the eighth lens element L8 at the maximum effective aperture, and et78 is the distance from the maximum effective aperture of the image-side surface S14 of the seventh lens element L7 to the maximum effective aperture of the object-side surface S15 of the eighth lens element L8 along the optical axis. Satisfying this relationship facilitates controlling the sag heights of the image-side surface S14 of the seventh lens element L7 and the object-side surface S15 of the eighth lens element L8, as well as the gap therebetween. This in turn reduces the deflection angle of marginal light rays passing through the two optical surfaces, thereby facilitating a smooth transition of marginal field light rays to the image plane, suppressing vignetting at the edge of the image plane, and improving the resolution of the optical system 10. In some embodiments, the relationship satisfied by the optical system 10 may specifically be 0.80, 0.87, 0.96, 1.07, 1.14, 1.23, 1.34, 1.45, or 1.52.

[0101] 0.5<sds / (sd81-sd31)<0.8; the optical system 10 includes a vignetting stop disposed between the second lens element L2 and the third lens element L3, sds is the maximum effective aperture of the vignetting stop, sd31 is the maximum effective aperture of the object-side surface S5 of the third lens element L3, and sd81 is the maximum effective aperture of the object-side surface S15 of the eighth lens element L8. sd81-sd31 represents the step difference between the third lens element L3 and the eighth lens element L8. When this relationship is satisfied, the aperture of the vignetting stop between the second lens element L2 and the third lens element L3 is appropriately configured with respect to this step difference, allowing light from the peripheral field of view, after passing through the vignetting stop, to reach the eighth lens element L8 and further onto the imaging plane S17 at a reasonable propagation angle. This design not only increases the image plane size and shortens the overall length of the optical system 10, but also facilitates increasing the aperture, increasing light throughput, and improving the imaging quality of the optical system 10 in relatively dim environments. It also helps control the aperture difference between lenses, avoiding excessive variations in the aperture of adjacent lenses and reducing the design pressure of the lens barrel. In some embodiments, this relationship satisfied by the optical system 10 can be 0.55, 0.59, 0.63, 0.67, 0.70, or 0.72.

[0102] 9.5<zh78 / zb78<12.2; zh78 is the maximum distance along the optical axis between the image-side surface S14 of the seventh lens element L7 and the object-side surface S15 of the eighth lens element L8, and zb78 is the shortest distance along the optical axis between the image-side surface S14 of the seventh lens element L7 and the object-side surface S15 of the eighth lens element L8. When this relationship is satisfied, the curvature between the seventh lens element L7 and the eighth lens element L8 can be properly controlled. This not only helps ensure that the eighth lens element L8 has sufficient distortion to match the seventh lens element L7 to correct system aberrations, but also reduces the deflection angle of marginal rays passing through the seventh and eighth lenses L7 and L8, thereby improving image quality. It also ensures a sufficient air gap between the seventh and eighth lenses L7 and L8 to meet molding and assembly requirements. In some embodiments, this relationship satisfied by the optical system 10 can be 9.7, 9.9, 10.3, 10.7, 11.3, or 11.7.

[0103] 4.2 < zh67 / zb67 < 7.5; zh67 is the maximum distance along the optical axis between the image-side surface S12 of the sixth lens element L6 and the object-side surface S13 of the seventh lens element L7, and zb67 is the shortest distance along the optical axis between the image-side surface S12 of the sixth lens element L6 and the object-side surface S13 of the seventh lens element L7. When this relationship is satisfied, the gap between the sixth lens element L6 and the seventh lens element L7 is properly distributed, with the difference between the maximum and minimum gaps being neither too large nor too small. This allows for optimal alignment of the image-side surface S12 of the sixth lens element L6 and the object-side surface S13 of the seventh lens element L7, improving aberration balance and resolving power of the optical system while also reducing ghost images and stray light. Furthermore, it shortens the overall system length and avoids assembly problems caused by close distances between lenses. In some embodiments, this relationship satisfied by the optical system 10 can be 4.46, 4.53, 4.77, 5.00, 5.24, 5.38, or 5.42.

[0104] 0.64<|jd22| / 45°<0.67; jd22 is the maximum acute angle formed by the tangent plane at each position of the image-side surface S4 of the second lens element L2 and a plane perpendicular to the optical axis. Optical system 10 includes a vignetting stop disposed between the second lens element L2 and the third lens element L3. The image-side surface S4 of the second lens element L2 is an adjacent optical surface located on the object side of the vignetting stop. Incident light is highly sensitive to the surface shape of this surface. Controlling the above ratio within a reasonable range can effectively control the surface complexity of this surface, reduce sensitivity, and improve the imaging quality of optical system 10. It can also reduce the difficulty of molding the second transparent element and improve the yield rate. In some embodiments, this relationship satisfied by optical system 10 can specifically be 0.652, 0.655, 0.658, or 0.664.

[0105] 0.41<|jd31| / 45°<0.51; jd31 is the maximum acute angle formed by the tangent plane at each position of the object-side surface S5 of the third lens element L3 and a plane perpendicular to the optical axis. Optical system 10 includes a vignetting stop disposed between second lens element L2 and third lens element L3. Object-side surface S5 of third lens element L3 is an adjacent optical surface located on the image side of the vignetting stop. Light deflects on this surface, and light from the central field of view and the peripheral field of view begin to separate in space. Therefore, incident light is more sensitive to this surface. Therefore, by satisfying this relationship, the maximum inclination angle of object-side surface S5 of third lens element L3 is reduced, reducing the complexity of this surface's surface shape, thereby improving the overall yield and imaging quality of optical system 10 and reducing the difficulty of lens molding. In some embodiments, this relationship satisfied by optical system 10 can be 0.43, 0.45, 0.46, 0.48, or 0.50.

[0106] Regarding the sag parameters sag62, sag71, sag72, and sag81 mentioned in the corresponding equations above, it should be noted that when describing the sag at the maximum effective aperture of a lens surface, it represents the distance from the intersection of the lens surface and the optical axis 101 to the position of the maximum effective aperture of the lens surface, parallel to the optical axis 101. When the sag at the maximum effective aperture of a lens surface is negative, it indicates that the position of the maximum effective aperture of the lens surface is closer to the object side than the intersection of the lens surface and the optical axis 101, and vice versa.

[0107] The values ​​of effective focal length and combined focal length in the above relationships refer to a wavelength of 555 nm. The descriptions of effective focal length, combined focal length, and refractive power refer at least to the values ​​of the corresponding lens or lens group at the near optical axis. Furthermore, the above relationships and the resulting technical effects are specific to an optical system 10 that satisfies the aforementioned lens design (number of lenses, refractive power configuration, surface configuration, etc.). If the aforementioned lens design of the optical system 10 is not ensured, it will be difficult to ensure that the optical system 10 can still achieve the corresponding technical effects while satisfying these relationships, and may even result in significant degradation of imaging performance.

[0108] In some embodiments, at least one lens of the optical system 10 has an aspheric surface type. When at least one side lens surface of the lens (object side or image side) is aspheric, the lens can be said to have an aspheric surface type. In one embodiment, the object side and image side of each lens can be designed to be aspheric. The aspheric design can help the optical system 10 to more effectively eliminate aberrations and improve imaging quality. In some embodiments, at least one lens of the optical system 10 can have a spherical surface type. The spherical surface type design can reduce the difficulty of preparing the lens and reduce the preparation cost. In some embodiments, in order to take into account factors such as preparation cost, preparation difficulty, imaging quality, and assembly difficulty, the design of each lens surface in the optical system 10 can be a combination of aspheric and spherical surface types.

[0109] The calculation of the aspheric surface shape can refer to the aspheric surface formula:

[0110]

[0111] Where Z is the distance from the corresponding point on the aspheric surface to the tangent plane of the surface at the optical axis, r is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the aspheric surface at the optical axis, k is the cone coefficient, and Ai is the coefficient of the higher-order term corresponding to the i-th higher-order term in the aspheric surface shape formula.

[0112] Regarding lens materials, in some embodiments, at least one lens in optical system 10 is made of plastic (PC), which can be polycarbonate, resin, or the like. In some embodiments, at least one lens in optical system 10 is made of glass (GL). In some embodiments, to balance factors such as manufacturing cost, manufacturing difficulty, and imaging quality, optical system 10 may be configured with lenses of different materials, i.e., a combination of glass and plastic lenses may be employed. The specific configuration relationship can be determined based on actual needs and is not exhaustive here.

[0113] The following describes the structure and imaging quality of the optical system 10 in the present application through more specific embodiments:

[0114] First embodiment

[0115] refer to Figure 1 In the first embodiment, the optical system 10 includes, from the object side to the image side along the optical axis 101, an aperture stop STO1, a first lens element L1 having positive refractive power, a second lens element L2 having negative refractive power, a vignetting stop STO2, a third lens element L3 having positive refractive power, a fourth lens element L4 having negative refractive power, a fifth lens element L5 having negative refractive power, a sixth lens element L6 having negative refractive power, a seventh lens element L7 having positive refractive power, and an eighth lens element L8 having negative refractive power, and the surface profiles of the lenses of the optical system 10 are as follows:

[0116] The object-side surface S1 of the first lens L1 is convex near the optical axis, and the image-side surface S2 is concave near the optical axis; the object-side surface S1 is concave near the maximum effective aperture, and the image-side surface S2 is convex near the maximum effective aperture.

[0117] The object-side surface S3 of the second lens L2 is convex near the optical axis, and the image-side surface S4 is concave near the optical axis; the object-side surface S3 is convex near the maximum effective aperture, and the image-side surface S4 is concave near the maximum effective aperture.

[0118] The object-side surface S5 of the third lens L3 is convex near the optical axis, and the image-side surface S6 is convex near the optical axis; the object-side surface S5 is concave near the maximum effective aperture, and the image-side surface S6 is convex near the maximum effective aperture.

[0119] The object-side surface S7 of the fourth lens L4 is convex near the optical axis, and the image-side surface S8 is concave near the optical axis; the object-side surface S7 is convex near the maximum effective aperture, and the image-side surface S8 is concave near the maximum effective aperture.

[0120] The object-side surface S9 of the fifth lens L5 is concave near the optical axis, and the image-side surface S10 is convex near the optical axis; the object-side surface S9 is concave near the maximum effective aperture, and the image-side surface S10 is concave near the maximum effective aperture.

[0121] The object-side surface S11 of the sixth lens L6 is convex near the optical axis, and the image-side surface S12 is concave near the optical axis; the object-side surface S11 is convex near the maximum effective aperture, and the image-side surface S12 is convex near the maximum effective aperture.

[0122] The object-side surface S13 of the seventh lens L7 is convex near the optical axis, and the image-side surface S14 is concave near the optical axis; the object-side surface S13 is concave near the maximum effective aperture, and the image-side surface S14 is concave near the maximum effective aperture.

[0123] The object-side surface S15 of the eighth lens L8 is concave near the optical axis, and the image-side surface S16 is concave near the optical axis; the object-side surface S15 is concave near the maximum effective aperture, and the image-side surface S16 is convex near the maximum effective aperture.

[0124] The parameters of the lenses of the optical system 10 in the first embodiment are shown in Table 1 below. The components of the optical system 10 are arranged in order from top to bottom in Table 1, from the object side to the image side. The infrared cutoff filter 110 can be part of the optical system 10 or removed from the optical system 10. However, after the infrared cutoff filter 110 is removed, the total optical length TTL of the optical system 10 should remain unchanged. The Y radius in Table 1 is the radius of curvature of the corresponding lens surface at the optical axis 101. The surface numbered S1 in Table 1 represents the object side surface of the first lens L1, and the surface numbered S2 represents the image side surface of the first lens L1. The absolute value of the first value in the "Thickness" parameter column of each lens is the thickness of the lens on the optical axis 101, and the absolute value of the second value is the distance from the image side surface of the lens to the next optical surface (the object side surface or the aperture surface of the next lens) on the optical axis 101. The aperture thickness parameter represents the distance from the aperture surface to the object side surface of the adjacent lens on the image side on the optical axis 101. The reference wavelength for the refractive index and Abbe number of each lens in the table is 587.6 nm, the reference wavelength for the focal length (effective focal length) is 555 nm, and the numerical units for the Y radius, thickness, and focal length (effective focal length) are all millimeters (mm). Furthermore, the parameter data and lens surface structures used in the relationship calculations in the following embodiments shall be based on the data in the lens parameter table of the corresponding embodiment.

[0125] Table 1

[0126]

[0127]

[0128] As shown in Table 1, the effective focal length f of the optical system 10 in the first embodiment is 6.126 mm, the aperture number FNO is 1.59, the maximum field of view FOV is 82.767°, and the total optical length TTL is 7.59 mm. Furthermore, Table 2 below shows the aspheric coefficients of the corresponding lens surfaces in Table 1, where K is the conic coefficient and Ai is the coefficient corresponding to the i-th order term in the aspheric surface shape formula.

[0129] Table 2

[0130] Surface number S1 S2 S3 S4 S5 S6 S7 S8 K 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 1.800E+01 A4 -4.211E-04 -2.286E-02 -3.686E-02 -1.712E-02 -3.938E-03 3.445E-02 9.829E-03 -1.489E-02 A6 3.039E-03 8.110E-03 9.111E-03 1.417E-03 -7.982E-03 -8.313E-02 -4.815E-02 -3.502E-03 A8 -4.210E-03 1.805E-03 1.190E-02 1.361E-02 5.281E-03 8.915E-02 2.079E-02 -1.515E-03 A10 3.699E-03 -4.167E-03 -1.610E-02 -1.514E-02 -7.352E-03 -8.196E-02 7.947E-03 3.116E-03 A12 -1.976E-03 2.661E-03 1.093E-02 9.045E-03 6.129E-03 5.263E-02 -2.343E-02 -1.991E-03 A14 6.451E-04 -9.959E-04 -4.657E-03 -3.009E-03 -2.960E-03 -2.141E-02 1.926E-02 7.455E-04 A16 -1.254E-04 2.236E-04 1.241E-03 4.796E-04 7.807E-04 5.289E-03 -7.935E-03 -1.899E-04 A18 1.324E-05 -2.752E-05 -1.869E-04 -5.970E-06 -8.720E-05 -7.386E-04 1.637E-03 2.978E-05 A20 -6.460E-07 1.402E-06 1.218E-05 -4.357E-06 0.000E+00 4.589E-05 -1.338E-04 -1.849E-06 Surface number S9 S10 S11 S12 S13 S14 S15 S16 K 0.000E+00 3.431E+00 1.239E+01 -4.879E+00 -1.000E+00 0.000E+00 0.000E+00 -7.645E-01 A4 -1.453E-02 -1.448E-02 -5.561E-03 -1.202E-01 -7.822E-02 6.491E-02 -5.656E-02 -7.198E-02 A6 -9.683E-04 3.403E-03 2.406E-02 8.224E-02 4.047E-02 -3.672E-02 1.125E-02 1.835E-02 A8 -2.471E-03 -1.112E-02 -2.436E-02 -3.918E-02 -2.343E-02 9.899E-03 -2.397E-03 -4.033E-03 A10 6.000E-03 9.111E-03 1.245E-02 1.277E-02 8.860E-03 -1.733E-03 5.990E-04 6.255E-04 A12 -3.737E-03 -3.481E-03 -4.076E-03 -2.920E-03 -2.248E-03 1.743E-04 -9.540E-05 -6.372E-05 A14 1.058E-03 6.630E-04 8.630E-04 4.539E-04 3.668E-04 -5.441E-06 8.753E-06 4.142E-06 A16 -1.419E-04 -4.330E-05 -1.142E-04 -4.462E-05 -3.600E-05 -6.182E-07 -4.603E-07 -1.654E-07 A18 7.665E-06 -3.502E-06 8.577E-06 2.466E-06 1.920E-06 6.225E-08 1.300E-08 3.703E-09 A20 -8.522E-08 4.660E-07 -2.777E-07 -5.798E-08 -4.267E-08 -1.639E-09 -1.535E-10 -3.562E-11

[0131] In the first embodiment, the optical system 10 satisfies the following relationships:

[0132] f678 / f6=3.069. When the optical system 10 satisfies this relationship, the combined focal length of the sixth lens element L6, the seventh lens element L7, and the eighth lens element L8, which are closest to the image side of the optical system 10, is optimally configured relative to the effective focal length of the sixth lens element L6. This helps mitigate the deflection angle of light in the peripheral field of view, reducing the sensitivity of incident light to the sixth through eighth lenses L6, L8, thereby effectively correcting aberrations generated by the object-side lenses and improving the imaging quality of the optical system 10. Furthermore, the optimal configuration of the refractive power of the sixth lens element L6 not only helps shorten the length of the optical system 10 but also reduces the refractive power burden of the sixth lens element L6, alleviating the difficulty in molding the sixth lens element L6 and improving its manufacturability.

[0133] ImgH / FNO=3.464mm; when this relationship is satisfied, it is not only beneficial for the optical system 10 to obtain a larger image surface, but also beneficial for the optical system 10 to obtain a compact structure, thereby taking into account the imaging characteristics of miniaturization, large image surface, and high pixels.

[0134] TTL / ImgH=1.377. When this relationship is satisfied, on the one hand, it is beneficial to reduce the total length of the optical system 10 and reduce the sensitivity. On the other hand, it can also enable the optical system 10 to meet the requirements of miniaturization design while taking into account the large image surface characteristics, so as to match a higher-pixel image sensor to capture clearer details.

[0135] f345 / f12=11.986 and f12=7.964mm; when this relationship is satisfied, it is beneficial to improve the field curvature and distortion aberration of the optical system 10 and balance the aberration of the optical system 10, so that the optical system 10 can obtain good imaging quality.

[0136] (f1+|f2|) / (r12+r22)=2.133. When this relationship is satisfied, the shapes and refractive power contributions of the first lens element L1 and the second lens element L2 can be reasonably constrained. This helps prevent excessive curvature of the lens surfaces, thereby improving aberration balance. It also helps shorten the overall system length and achieve large aperture characteristics.

[0137] ct37 / et37=1.23. When this relationship is satisfied, the total length of the system is shortened, achieving a compact structure between the third lens L3 to the seventh lens L7. At the same time, the center thickness and edge thickness of each lens are reasonably configured, which is conducive to uniform size distribution of each lens and ensures stability in subsequent lens assembly.

[0138] f / (sd82-sd11)=2.439. When this relationship is satisfied, the difference in aperture between the first lens element L1 and the eighth lens element L8 can be reasonably constrained, so that the optical system 10 can obtain a larger image surface. This also helps to shorten the overall length of the system while achieving a small head design.

[0139] (r62+r71) / (|sag62|+|sag71|)=6.771. When this relationship is satisfied, it is beneficial to constrain the shapes of the image-side surface S12 of the sixth lens element L6 and the object-side surface S13 of the seventh lens element L7, so that the central surface shape and the edge surface shape of the two optical surfaces can be reasonably matched, thereby balancing the system coma, improving the processability of the processing of the two lenses, and enhancing the imaging quality of the optical system 10.

[0140] ct78 / ct23=1.860. When this relationship is satisfied, the gap between the second lens L2 and the third lens L3, as well as the gap between the seventh lens L7 and the eighth lens L8, can be reasonably constrained, thereby improving the processing and assembly feasibility of the optical system 10, while also facilitating shortening the overall length of the system and improving the imaging quality of the central field of view.

[0141] (|sag81|-|sag72|) / et78=0.854. When this relationship is satisfied, it is beneficial to control the sag heights of the image-side surface S14 of the seventh lens element L7 and the object-side surface S15 of the eighth lens element L8, as well as the gap between them. This allows marginal light rays to have a smaller deflection angle when passing through the two optical surfaces, thereby facilitating a smooth transition of marginal field light rays to the image plane, while suppressing vignetting at the edge of the image plane and improving the resolution of the optical system 10.

[0142] sds / (sd81-sd31)=0.633; sd81-sd31 represents the step difference between the third lens element L3 and the eighth lens element L8. When this relationship is satisfied, the aperture of the vignetting stop STO2 located between the second lens element L2 and the third lens element L3 is properly configured in accordance with this step difference, so that light rays from the peripheral field of view, after passing through the vignetting stop STO2, can reach the eighth lens element L8 at a reasonable propagation angle and further reach the imaging surface S17. This design not only helps increase the image plane size and shorten the overall length of the optical system 10, but also helps increase the aperture, increase the light flux, and improve the imaging quality of the optical system 10 in relatively dark environments. It also helps control the aperture difference between the lenses, avoids excessive variations in the apertures of adjacent lenses, and reduces the design pressure of the lens barrel.

[0143] zh78 / zb78=10.387. When this relationship is satisfied, the curvature between the seventh lens L7 and the eighth lens L8 can be properly controlled. This, on the one hand, helps ensure that the eighth lens L8 has sufficient twist to match the seventh lens L7 to correct system aberrations, and promotes a smaller deflection angle of marginal light when passing through the seventh lens L7 and the eighth lens L8, thereby improving image quality. On the other hand, it also allows for a sufficient air gap to be left between the seventh lens L7 and the eighth lens L8 to meet molding and assembly requirements.

[0144] zh67 / zb67=4.622. When this relationship is satisfied, the gap between the sixth lens element L6 and the seventh lens element L7 can be reasonably distributed, with the difference between the maximum gap and the minimum gap being neither too large nor too small. This allows the profiles of the image-side surface S12 of the sixth lens element L6 and the object-side surface S13 of the seventh lens element L7 to be matched, thereby promoting aberration balance in the optical system and improving the system's resolution. This also helps reduce ghost images and stray light. Furthermore, it helps shorten the overall length of the system and avoid assembly defects caused by close distances between the lenses.

[0145] |jd22| / 45°=0.657; the image-side surface S4 of the second lens element L2 is an adjacent optical surface located on the object side of the vignetting stop STO2. Incident light is highly sensitive to the surface shape of this surface. Controlling the above ratio within a reasonable range can effectively control the surface complexity of this surface, reduce sensitivity, and improve the imaging quality of the optical system 10. It can also reduce the difficulty of molding and processing the second transparent element, thereby improving the yield rate.

[0146] |jd31| / 45°=0.434; the object-side surface S5 of the third lens element L3 is an adjacent optical surface located on the image side of the vignetting stop STO2. Light is deflected on this surface, and light from the central field of view and the peripheral field of view begin to separate in space. Therefore, the incident light is highly sensitive to this surface. Therefore, by satisfying this relationship condition, the maximum inclination angle of the object-side surface S5 of the third lens element L3 is reduced, and the complexity of the surface shape of this surface is reduced, thereby improving the overall yield and imaging quality of the optical system 10 and reducing the difficulty of lens molding.

[0147] Further references Figure 2 , Figure 2 The longitudinal spherical aberration diagram, astigmatism diagram and distortion diagram of the optical system 10 in the first embodiment are included, wherein the reference wavelength of the astigmatism diagram and the distortion diagram is 555nm, and the astigmatism diagram and distortion diagram of the following embodiments are Figure 1 Like. The longitudinal spherical aberration diagram (Longitudinal Spherical Aberration) shows the degree of focus deviation of light of different wavelengths after passing through the lens. The ordinate of the longitudinal spherical aberration diagram represents the normalized pupil coordinate (Normalized Pupil Coordinator) from the center of the pupil to the edge of the pupil, and the abscissa represents the distance from the imaging plane to the intersection of the light and the optical axis (in mm). It can be seen from the longitudinal spherical aberration diagram that the degree of convergence focus deviation of light of each wavelength in the first embodiment tends to be consistent, and the maximum focus offset of each reference wavelength is controlled within ±0.05mm, and the diffuse spots or color halos in the imaging picture are effectively suppressed. Figure 2Also included are astigmatic field curves for optical system 10, where the S curve represents sagittal field curvature at 555nm, and the T curve represents meridional field curvature at 555nm. As can be seen from the figure, the optical system's field curvature is minimal, with the maximum field curvature controlled within ±0.025mm. The degree of image curvature is effectively suppressed, and the sagittal and meridional field curvatures across all fields of view are consistent, effectively controlling astigmatism across all fields of view. Therefore, it can be seen that optical system 10 exhibits clear imaging from the center to the edges of its field of view. Furthermore, the distortion diagram shows that the maximum distortion of optical system 10 is controlled within 2.5%, demonstrating that the degree of distortion in the image is well controlled.

[0148] Second embodiment

[0149] refer to Figure 3 In the second embodiment, the optical system 10 includes, from the object side to the image side along the optical axis 101, an aperture stop STO1, a first lens element L1 having positive refractive power, a second lens element L2 having negative refractive power, a vignetting stop STO2, a third lens element L3 having positive refractive power, a fourth lens element L4 having negative refractive power, a fifth lens element L5 having positive refractive power, a sixth lens element L6 having negative refractive power, a seventh lens element L7 having positive refractive power, and an eighth lens element L8 having negative refractive power, and the surface profiles of the lenses of the optical system 10 are as follows:

[0150] The object-side surface S1 of the first lens L1 is convex near the optical axis, and the image-side surface S2 is concave near the optical axis; the object-side surface S1 is concave near the maximum effective aperture, and the image-side surface S2 is convex near the maximum effective aperture.

[0151] The object-side surface S3 of the second lens L2 is convex near the optical axis, and the image-side surface S4 is concave near the optical axis; the object-side surface S3 is convex near the maximum effective aperture, and the image-side surface S4 is concave near the maximum effective aperture.

[0152] The object-side surface S5 of the third lens L3 is concave near the optical axis, and the image-side surface S6 is convex near the optical axis; the object-side surface S5 is concave near the maximum effective aperture, and the image-side surface S6 is convex near the maximum effective aperture.

[0153] The object-side surface S7 of the fourth lens L4 is concave near the optical axis, and the image-side surface S8 is concave near the optical axis; the object-side surface S7 is convex near the maximum effective aperture, and the image-side surface S8 is concave near the maximum effective aperture.

[0154] The object-side surface S9 of the fifth lens L5 is concave near the optical axis, and the image-side surface S10 is convex near the optical axis; the object-side surface S9 is concave near the maximum effective aperture, and the image-side surface S10 is concave near the maximum effective aperture.

[0155] The object-side surface S11 of the sixth lens L6 is convex near the optical axis, and the image-side surface S12 is concave near the optical axis; the object-side surface S11 is convex near the maximum effective aperture, and the image-side surface S12 is convex near the maximum effective aperture.

[0156] The object-side surface S13 of the seventh lens L7 is convex near the optical axis, and the image-side surface S14 is convex near the optical axis; the object-side surface S13 is concave near the maximum effective aperture, and the image-side surface S14 is concave near the maximum effective aperture.

[0157] The object-side surface S15 of the eighth lens L8 is concave near the optical axis, and the image-side surface S16 is concave near the optical axis; the object-side surface S15 is concave near the maximum effective aperture, and the image-side surface S16 is convex near the maximum effective aperture.

[0158] The parameters of each lens of the optical system 10 in this embodiment are given in Table 3 and Table 4, wherein the definitions of each component name and parameter can be obtained from the first embodiment and are not repeated here.

[0159] Table 3

[0160]

[0161]

[0162] Table 4

[0163] Surface number S1 S2 S3 S4 S5 S6 S7 S8 K 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 1.800E+01 A4 -3.444E-04 -2.388E-02 -3.879E-02 -1.818E-02 -5.608E-03 3.250E-02 1.219E-02 -1.171E-02 A6 3.432E-03 9.415E-03 1.120E-02 2.650E-03 -5.393E-03 -8.143E-02 -5.680E-02 -1.209E-02 A8 -4.846E-03 2.639E-03 1.184E-02 1.275E-02 2.020E-03 8.803E-02 3.606E-02 1.030E-02 A10 4.423E-03 -6.322E-03 -1.781E-02 -1.465E-02 -3.629E-03 -8.042E-02 -1.061E-02 -8.083E-03 A12 -2.501E-03 4.385E-03 1.260E-02 8.426E-03 3.452E-03 5.278E-02 -7.425E-03 4.959E-03 A14 8.870E-04 -1.750E-03 -5.469E-03 -2.350E-03 -1.780E-03 -2.249E-02 1.045E-02 -2.000E-03 A16 -1.928E-04 4.159E-04 1.467E-03 1.162E-04 4.917E-04 5.903E-03 -5.074E-03 4.833E-04 A18 2.359E-05 -5.434E-05 -2.212E-04 9.364E-05 -5.746E-05 -8.807E-04 1.140E-03 -6.318E-05 A20 -1.320E-06 2.975E-06 1.439E-05 -1.526E-05 0.000E+00 5.819E-05 -9.826E-05 3.605E-06 Surface number S9 S10 S11 S12 S13 S14 S15 S16 K 0.000E+00 3.431E+00 -3.010E-01 -5.747E+00 -1.000E+00 0.000E+00 0.000E+00 -7.679E-01 A4 -1.132E-02 -8.230E-03 3.460E-03 -1.092E-01 -7.635E-02 6.304E-02 -5.113E-02 -6.893E-02 A6 -1.123E-02 -9.550E-03 1.260E-02 7.145E-02 3.672E-02 -3.620E-02 4.695E-03 1.560E-02 A8 1.231E-02 2.773E-03 -1.618E-02 -3.338E-02 -2.027E-02 1.021E-02 2.055E-05 -3.026E-03 A10 -6.341E-03 6.976E-05 8.405E-03 1.050E-02 7.609E-03 -1.850E-03 1.499E-04 4.368E-04 A12 2.504E-03 2.892E-04 -2.696E-03 -2.302E-03 -1.943E-03 1.872E-04 -4.693E-05 -4.299E-05 A14 -9.073E-04 -3.403E-04 5.571E-04 3.450E-04 3.179E-04 -5.364E-06 5.596E-06 2.750E-06 A16 2.430E-04 1.184E-04 -7.248E-05 -3.303E-05 -3.113E-05 -7.511E-07 -3.390E-07 -1.091E-07 A18 -3.602E-05 -1.766E-05 5.410E-06 1.790E-06 1.649E-06 7.289E-08 1.050E-08 2.436E-09 A20 2.133E-06 9.746E-07 -1.752E-07 -4.141E-08 -3.634E-08 -1.915E-09 -1.329E-10 -2.345E-11

[0164] The optical system 10 in this embodiment satisfies the following relationship:

[0165] f678 / f6 3.343 f / (sd82-sd11) 2.361 ImgH / FNO(mm) 3.444 (r62+r71) / (|sag62|+|sag71|) 6.643 TTL / ImgH 1.376 ct78 / ct23 1.754 f345 / f12 10.999 (|sag81|-|sag72|) / et78 0.984 (f1+|f2|) / (r12+r22) 2.376 sds / (sd81-sd31) 0.647 ct37 / et37 1.304 zh78 / zb78 10.186 zh67 / zb67 4.578 |jd22| / 45° 0.657 |jd31| / 45° 0.428

[0166] Depend on Figure 4 As can be seen from the various aberration diagrams in the figure, the longitudinal spherical aberration, field curvature, astigmatism, and distortion of the optical system 10 are all well controlled. The focus shift at each reference wavelength is controlled within ±0.05mm. At the same time, the meridional field curvature and sagittal field curvature at each field of view are both controlled within ±0.025mm. The degree of image curvature is effectively suppressed, the astigmatism is well adjusted, and the maximum distortion is also controlled within 2.5%. Therefore, it can be judged that the optical system 10 of this embodiment can achieve clear imaging.

[0167] Third embodiment

[0168] refer to Figure 5In the third embodiment, the optical system 10 includes, from the object side to the image side along the optical axis 101, an aperture stop STO1, a first lens element L1 having positive refractive power, a second lens element L2 having negative refractive power, a vignetting stop STO2, a third lens element L3 having positive refractive power, a fourth lens element L4 having negative refractive power, a fifth lens element L5 having positive refractive power, a sixth lens element L6 having negative refractive power, a seventh lens element L7 having positive refractive power, and an eighth lens element L8 having negative refractive power, and the surface profiles of the lenses of the optical system 10 are as follows:

[0169] The object-side surface S1 of the first lens L1 is convex near the optical axis, and the image-side surface S2 is concave near the optical axis; the object-side surface S1 is concave near the maximum effective aperture, and the image-side surface S2 is convex near the maximum effective aperture.

[0170] The object-side surface S3 of the second lens L2 is convex near the optical axis, and the image-side surface S4 is concave near the optical axis; the object-side surface S3 is convex near the maximum effective aperture, and the image-side surface S4 is concave near the maximum effective aperture.

[0171] The object-side surface S5 of the third lens L3 is concave near the optical axis, and the image-side surface S6 is convex near the optical axis; the object-side surface S5 is concave near the maximum effective aperture, and the image-side surface S6 is convex near the maximum effective aperture.

[0172] The object-side surface S7 of the fourth lens L4 is concave near the optical axis, and the image-side surface S8 is concave near the optical axis; the object-side surface S7 is convex near the maximum effective aperture, and the image-side surface S8 is concave near the maximum effective aperture.

[0173] The object-side surface S9 of the fifth lens L5 is convex near the optical axis, and the image-side surface S10 is concave near the optical axis; the object-side surface S9 is convex near the maximum effective aperture, and the image-side surface S10 is concave near the maximum effective aperture.

[0174] The object-side surface S11 of the sixth lens L6 is concave near the optical axis, and the image-side surface S12 is concave near the optical axis; the object-side surface S11 is convex near the maximum effective aperture, and the image-side surface S12 is concave near the maximum effective aperture.

[0175] The object-side surface S13 of the seventh lens L7 is convex near the optical axis, and the image-side surface S14 is concave near the optical axis; the object-side surface S13 is concave near the maximum effective aperture, and the image-side surface S14 is concave near the maximum effective aperture.

[0176] The object-side surface S15 of the eighth lens L8 is convex near the optical axis, and the image-side surface S16 is concave near the optical axis; the object-side surface S15 is concave near the maximum effective aperture, and the image-side surface S16 is convex near the maximum effective aperture.

[0177] The parameters of each lens of the optical system 10 in this embodiment are given in Table 5 and Table 6, wherein the definitions of each component name and parameter can be obtained from the first embodiment and are not repeated here.

[0178] Table 5

[0179]

[0180] Table 6

[0181] Surface number S1 S2 S3 S4 S5 S6 S7 S8 K 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 1.281E+01 A4 -3.670E-04 -2.477E-02 -4.097E-02 -2.004E-02 -6.220E-03 4.541E-02 2.685E-02 -8.403E-03 A6 3.616E-03 1.233E-02 1.488E-02 4.756E-03 -8.837E-03 -1.462E-01 -1.225E-01 -3.047E-02 A8 -5.678E-03 9.710E-04 1.119E-02 1.325E-02 1.077E-02 2.124E-01 1.594E-01 4.037E-02 A10 5.662E-03 -6.909E-03 -2.147E-02 -1.892E-02 -1.485E-02 -2.192E-01 -1.438E-01 -3.529E-02 A12 -3.509E-03 5.808E-03 1.744E-02 1.377E-02 1.209E-02 1.511E-01 8.356E-02 1.993E-02 A14 1.369E-03 -2.676E-03 -8.518E-03 -5.799E-03 -5.742E-03 -6.705E-02 -2.930E-02 -7.160E-03 A16 -3.283E-04 7.277E-04 2.549E-03 1.353E-03 1.484E-03 1.835E-02 5.604E-03 1.576E-03 A18 4.423E-05 -1.090E-04 -4.275E-04 -1.361E-04 -1.616E-04 -2.824E-03 -4.554E-04 -1.926E-04 A20 -2.629E-06 6.926E-06 3.080E-05 1.464E-06 0.000E+00 1.876E-04 2.806E-06 1.018E-05 Surface number S9 S10 S11 S12 S13 S14 S15 S16 K 0.000E+00 -1.657E+01 -6.647E+00 -6.624E+00 -1.000E+00 0.000E+00 0.000E+00 -7.873E-01 A4 -1.055E-02 -1.104E-02 4.754E-03 -1.150E-01 -7.703E-02 7.269E-02 -5.767E-02 -7.664E-02 A6 -1.647E-02 -5.938E-03 1.330E-02 7.690E-02 3.903E-02 -4.304E-02 3.780E-03 1.739E-02 A8 1.821E-02 -1.497E-03 -1.919E-02 -3.970E-02 -2.333E-02 1.255E-02 1.465E-03 -3.330E-03 A10 -9.443E-03 4.477E-03 1.110E-02 1.447E-02 9.015E-03 -2.388E-03 -2.987E-04 4.716E-04 A12 2.665E-03 -2.628E-03 -3.873E-03 -3.643E-03 -2.274E-03 2.844E-04 2.367E-05 -4.541E-05 A14 -3.899E-04 7.735E-04 8.399E-04 6.052E-04 3.634E-04 -1.869E-05 -8.258E-07 2.829E-06 A16 2.617E-05 -1.215E-04 -1.112E-04 -6.204E-05 -3.485E-05 4.538E-07 2.923E-09 -1.086E-07 A18 -6.694E-07 9.538E-06 8.275E-06 3.519E-06 1.822E-06 1.173E-08 5.829E-10 2.333E-09 A20 2.153E-08 -2.881E-07 -2.651E-07 -8.401E-08 -3.984E-08 -6.190E-10 -1.153E-11 -2.148E-11

[0182] The optical system 10 in this embodiment satisfies the following relationship:

[0183] f678 / f6 3.313 f / (sd82-sd11) 2.285 ImgH / FNO(mm) 3.380 (r62+r71) / (|sag62|+|sag71|) 6.910 TTL / ImgH 1.368 ct78 / ct23 1.719 f345 / f12 8.813 (|sag81|-|sag72|) / et78 0.782 (f1+|f2|) / (r12+r22) 2.104 sds / (sd81-sd31) 0.605 ct37 / et37 1.248 zh78 / zb78 10.647 zh67 / zb67 7.477 |jd22| / 45° 0.658 |jd31| / 45° 0.424

[0184] Depend on Figure 6 As can be seen from the various aberration diagrams in the figure, the longitudinal spherical aberration, field curvature, astigmatism, and distortion of the optical system 10 are all well controlled. The focus shift at each reference wavelength is controlled within ±0.05mm. At the same time, the meridional field curvature and sagittal field curvature at each field of view are both controlled within ±0.025mm. The degree of image curvature is effectively suppressed, the astigmatism is well adjusted, and the maximum distortion is also controlled within 2.5%. Therefore, it can be judged that the optical system 10 of this embodiment can achieve clear imaging.

[0185] Fourth embodiment

[0186] refer to Figure 7 In the fourth embodiment, the optical system 10 includes, from the object side to the image side along the optical axis 101, an aperture stop STO1, a first lens element L1 having positive refractive power, a second lens element L2 having negative refractive power, a vignetting stop STO2, a third lens element L3 having negative refractive power, a fourth lens element L4 having positive refractive power, a fifth lens element L5 having negative refractive power, a sixth lens element L6 having negative refractive power, a seventh lens element L7 having positive refractive power, and an eighth lens element L8 having negative refractive power, and the surface profiles of the lenses of the optical system 10 are as follows:

[0187] The object-side surface S1 of the first lens L1 is convex near the optical axis, and the image-side surface S2 is concave near the optical axis; the object-side surface S1 is concave near the maximum effective aperture, and the image-side surface S2 is convex near the maximum effective aperture.

[0188] The object-side surface S3 of the second lens L2 is convex near the optical axis, and the image-side surface S4 is concave near the optical axis; the object-side surface S3 is convex near the maximum effective aperture, and the image-side surface S4 is concave near the maximum effective aperture.

[0189] The object-side surface S5 of the third lens L3 is concave near the optical axis, and the image-side surface S6 is concave near the optical axis; the object-side surface S5 is concave near the maximum effective aperture, and the image-side surface S6 is convex near the maximum effective aperture.

[0190] The object-side surface S7 of the fourth lens L4 is convex near the optical axis, and the image-side surface S8 is concave near the optical axis; the object-side surface S7 is convex near the maximum effective aperture, and the image-side surface S8 is concave near the maximum effective aperture.

[0191] The object-side surface S9 of the fifth lens L5 is convex near the optical axis, and the image-side surface S10 is concave near the optical axis; the object-side surface S9 is convex near the maximum effective aperture, and the image-side surface S10 is concave near the maximum effective aperture.

[0192] The object-side surface S11 of the sixth lens L6 is convex near the optical axis, and the image-side surface S12 is concave near the optical axis; the object-side surface S11 is convex near the maximum effective aperture, and the image-side surface S12 is concave near the maximum effective aperture.

[0193] The object-side surface S13 of the seventh lens L7 is convex near the optical axis, and the image-side surface S14 is concave near the optical axis; the object-side surface S13 is concave near the maximum effective aperture, and the image-side surface S14 is convex near the maximum effective aperture.

[0194] The object-side surface S15 of the eighth lens L8 is concave near the optical axis, and the image-side surface S16 is concave near the optical axis; the object-side surface S15 is concave near the maximum effective aperture, and the image-side surface S16 is convex near the maximum effective aperture.

[0195] The parameters of each lens of the optical system 10 in this embodiment are given in Table 7 and Table 8, wherein the definitions of each component name and parameter can be obtained from the first embodiment and are not repeated here.

[0196] Table 7

[0197]

[0198] Table 8

[0199]

[0200]

[0201] The optical system 10 in this embodiment satisfies the following relationship:

[0202] f678 / f6 3.502 f / (sd82-sd11) 2.343 ImgH / FNO(mm) 3.339 (r62+r71) / (|sag62|+|sag71|) 7.277 TTL / ImgH 1.377 ct78 / ct23 1.791 f345 / f12 13.499 (|sag81|-|sag72|) / et78 1.286 (f1+|f2|) / (r12+r22) 1.750 sds / (sd81-sd31) 0.617 ct37 / et37 1.292 zh78 / zb78 10.281 zh67 / zb67 4.354 |jd22| / 45° 0.660 |jd31| / 45° 0.432

[0203] Depend on Figure 8As can be seen from the various aberration diagrams in the figure, the longitudinal spherical aberration, field curvature, astigmatism, and distortion of the optical system 10 are all well controlled. The focus shift at each reference wavelength is controlled within ±0.05mm. At the same time, the meridional field curvature and sagittal field curvature at each field of view are both controlled within ±0.025mm. The degree of image curvature is effectively suppressed, the astigmatism is well adjusted, and the maximum distortion is also controlled within 2.5%. Therefore, it can be judged that the optical system 10 of this embodiment can achieve clear imaging.

[0204] Fifth embodiment

[0205] refer to Figure 9 In the fifth embodiment, the optical system 10 includes, along the optical axis 101 from the object side to the image side, an aperture stop STO1, a first lens element L1 having positive refractive power, a second lens element L2 having negative refractive power, a vignetting stop STO2, a third lens element L3 having positive refractive power, a fourth lens element L4 having negative refractive power, a fifth lens element L5 having negative refractive power, a sixth lens element L6 having negative refractive power, a seventh lens element L7 having positive refractive power, and an eighth lens element L8 having negative refractive power, and the surface profiles of the lenses of the optical system 10 are as follows:

[0206] The object-side surface S1 of the first lens L1 is convex near the optical axis, and the image-side surface S2 is concave near the optical axis; the object-side surface S1 is concave near the maximum effective aperture, and the image-side surface S2 is convex near the maximum effective aperture.

[0207] The object-side surface S3 of the second lens L2 is convex near the optical axis, and the image-side surface S4 is concave near the optical axis; the object-side surface S3 is convex near the maximum effective aperture, and the image-side surface S4 is concave near the maximum effective aperture.

[0208] The object-side surface S5 of the third lens L3 is convex near the optical axis, and the image-side surface S6 is convex near the optical axis; the object-side surface S5 is concave near the maximum effective aperture, and the image-side surface S6 is convex near the maximum effective aperture.

[0209] The object-side surface S7 of the fourth lens L4 is concave near the optical axis, and the image-side surface S8 is convex near the optical axis; the object-side surface S7 is convex near the maximum effective aperture, and the image-side surface S8 is concave near the maximum effective aperture.

[0210] The object-side surface S9 of the fifth lens L5 is concave near the optical axis, and the image-side surface S10 is convex near the optical axis; the object-side surface S9 is convex near the maximum effective aperture, and the image-side surface S10 is concave near the maximum effective aperture.

[0211] The object-side surface S11 of the sixth lens L6 is concave near the optical axis, and the image-side surface S12 is concave near the optical axis; the object-side surface S11 is convex near the maximum effective aperture, and the image-side surface S12 is concave near the maximum effective aperture.

[0212] The object-side surface S13 of the seventh lens L7 is convex near the optical axis, and the image-side surface S14 is concave near the optical axis; the object-side surface S13 is concave near the maximum effective aperture, and the image-side surface S14 is convex near the maximum effective aperture.

[0213] The object-side surface S15 of the eighth lens L8 is concave near the optical axis, and the image-side surface S16 is concave near the optical axis; the object-side surface S15 is concave near the maximum effective aperture, and the image-side surface S16 is convex near the maximum effective aperture.

[0214] The parameters of each lens of the optical system 10 in this embodiment are given in Tables 9 and 10, wherein the definitions of each component name and parameter can be obtained from the first embodiment and are not repeated here.

[0215] Table 9

[0216]

[0217] Table 10

[0218]

[0219]

[0220] The optical system 10 in this embodiment satisfies the following relationship:

[0221] f678 / f6 2.775 f / (sd82-sd11) 2.204 ImgH / FNO(mm) 3.232 (r62+r71) / (|sag62|+|sag71|) 5.854 TTL / ImgH 1.275 ct78 / ct23 1.985 f345 / f12 6.985 (|sag81|-|sag72|) / et78 1.094 (f1+|f2|) / (r12+r22) 2.826 sds / (sd81-sd31) 0.573 ct37 / et37 1.263 zh78 / zb78 9.546 zh67 / zb67 4.768 |jd22| / 45° 0.649 |jd31| / 45° 0.425

[0222] Depend on Figure 10 As can be seen from the various aberration diagrams in the figure, the longitudinal spherical aberration, field curvature, astigmatism, and distortion of the optical system 10 are all well controlled. The focus shift at each reference wavelength is controlled within ±0.05mm. At the same time, the meridional field curvature and sagittal field curvature at each field of view are both controlled within ±0.025mm. The degree of image curvature is effectively suppressed, the astigmatism is well adjusted, and the maximum distortion is also controlled within 2.5%. Therefore, it can be judged that the optical system 10 of this embodiment can achieve clear imaging.

[0223] Sixth embodiment

[0224] refer to Figure 11 In the sixth embodiment, the optical system 10 includes, in order from the object side to the image side along the optical axis 101, an aperture stop STO1, a first lens element L1 having positive refractive power, a second lens element L2 having negative refractive power, a vignetting stop STO2, a third lens element L3 having positive refractive power, a fourth lens element L4 having negative refractive power, a fifth lens element L5 having negative refractive power, a sixth lens element L6 having negative refractive power, a seventh lens element L7 having positive refractive power, and an eighth lens element L8 having negative refractive power, and the surface profiles of the lenses of the optical system 10 are as follows:

[0225] The object-side surface S1 of the first lens L1 is convex near the optical axis, and the image-side surface S2 is concave near the optical axis; the object-side surface S1 is convex near the maximum effective aperture, and the image-side surface S2 is convex near the maximum effective aperture.

[0226] The object-side surface S3 of the second lens L2 is convex near the optical axis, and the image-side surface S4 is concave near the optical axis; the object-side surface S3 is convex near the maximum effective aperture, and the image-side surface S4 is concave near the maximum effective aperture.

[0227] The object-side surface S5 of the third lens L3 is convex near the optical axis, and the image-side surface S6 is convex near the optical axis; the object-side surface S5 is concave near the maximum effective aperture, and the image-side surface S6 is convex near the maximum effective aperture.

[0228] The object-side surface S7 of the fourth lens L4 is concave near the optical axis, and the image-side surface S8 is convex near the optical axis; the object-side surface S7 is convex near the maximum effective aperture, and the image-side surface S8 is concave near the maximum effective aperture.

[0229] The object-side surface S9 of the fifth lens L5 is concave near the optical axis, and the image-side surface S10 is convex near the optical axis; the object-side surface S9 is convex near the maximum effective aperture, and the image-side surface S10 is concave near the maximum effective aperture.

[0230] The object-side surface S11 of the sixth lens L6 is concave near the optical axis, and the image-side surface S12 is concave near the optical axis; the object-side surface S11 is convex near the maximum effective aperture, and the image-side surface S12 is concave near the maximum effective aperture.

[0231] The object-side surface S13 of the seventh lens L7 is convex near the optical axis, and the image-side surface S14 is concave near the optical axis; the object-side surface S13 is concave near the maximum effective aperture, and the image-side surface S14 is convex near the maximum effective aperture.

[0232] The object-side surface S15 of the eighth lens L8 is concave near the optical axis, and the image-side surface S16 is concave near the optical axis; the object-side surface S15 is concave near the maximum effective aperture, and the image-side surface S16 is convex near the maximum effective aperture.

[0233] The parameters of each lens of the optical system 10 in this embodiment are given in Table 11 and Table 12, wherein the definitions of each component name and parameter can be obtained from the first embodiment and are not repeated here.

[0234] Table 11

[0235]

[0236]

[0237] Table 12

[0238] Surface number S1 S2 S3 S4 S5 S6 S7 S8 K 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 -2.000E+00 A4 1.027E-04 -2.947E-02 -4.910E-02 -2.298E-02 -1.221E-02 2.676E-02 2.726E-02 1.321E-02 A6 5.557E-03 1.273E-02 2.319E-02 9.319E-03 -4.837E-03 -1.749E-01 -2.021E-01 -1.245E-01 A8 -1.154E-02 9.312E-03 6.329E-03 1.979E-02 1.368E-03 3.615E-01 4.049E-01 2.261E-01 A10 1.621E-02 -2.539E-02 -1.949E-02 -3.887E-02 -4.771E-03 -5.184E-01 -5.529E-01 -2.573E-01 A12 -1.443E-02 2.682E-02 1.832E-02 4.140E-02 5.616E-03 4.787E-01 4.806E-01 1.850E-01 A14 8.231E-03 -1.685E-02 -1.038E-02 -2.765E-02 -3.996E-03 -2.774E-01 -2.588E-01 -8.416E-02 A16 -2.926E-03 6.347E-03 3.686E-03 1.146E-02 1.475E-03 9.729E-02 8.300E-02 2.350E-02 A18 5.893E-04 -1.314E-03 -7.272E-04 -2.633E-03 -2.173E-04 -1.889E-02 -1.443E-02 -3.674E-03 A20 -5.200E-05 1.142E-04 5.976E-05 2.606E-04 0.000E+00 1.560E-03 1.040E-03 2.466E-04 Surface number S9 S10 S11 S12 S13 S14 S15 S16 K 0.000E+00 -1.657E+01 -6.647E+00 -5.960E+00 -1.000E+00 0.000E+00 0.000E+00 -7.309E-01 A4 7.760E-03 2.257E-03 1.455E-02 -1.465E-01 -1.036E-01 8.195E-02 -6.821E-02 -8.844E-02 A6 -1.274E-01 -7.047E-02 -1.399E-02 9.691E-02 5.029E-02 -5.916E-02 1.296E-02 2.543E-02 A8 1.954E-01 7.652E-02 5.162E-03 -4.699E-02 -2.832E-02 2.193E-02 -1.484E-03 -6.031E-03 A10 -1.666E-01 -4.571E-02 -1.984E-03 1.646E-02 1.135E-02 -5.492E-03 2.765E-04 1.007E-03 A12 8.719E-02 1.622E-02 5.729E-04 -4.223E-03 -3.157E-03 8.835E-04 -4.881E-05 -1.112E-04 A14 -2.821E-02 -3.151E-03 -1.447E-04 7.535E-04 5.668E-04 -8.591E-05 5.018E-06 7.842E-06 A16 5.553E-03 2.758E-04 2.822E-05 -8.531E-05 -6.085E-05 4.695E-06 -2.864E-07 -3.393E-07 A18 -6.170E-04 -1.549E-06 -3.018E-06 5.395E-06 3.527E-06 -1.234E-07 8.583E-09 8.208E-09 A20 2.997E-05 -8.449E-07 1.257E-07 -1.437E-07 -8.478E-08 9.549E-10 -1.062E-10 -8.504E-11

[0239] The optical system 10 in this embodiment satisfies the following relationship:

[0240]

[0241]

[0242] Depend on Figure 12 As can be seen from the various aberration diagrams in the figure, the longitudinal spherical aberration, field curvature, astigmatism, and distortion of the optical system 10 are all well controlled. The focus shift at each reference wavelength is controlled within ±0.05mm. At the same time, the meridional field curvature and sagittal field curvature at each field of view are both controlled within ±0.025mm. The degree of image curvature is effectively suppressed, the astigmatism is well adjusted, and the maximum distortion is also controlled within 2.5%. Therefore, it can be judged that the optical system 10 of this embodiment can achieve clear imaging.

[0243] Seventh embodiment

[0244] refer to Figure 13 In the seventh embodiment, the optical system 10 includes, in order from the object side to the image side along the optical axis 101, an aperture stop STO1, a first lens element L1 having positive refractive power, a second lens element L2 having negative refractive power, a vignetting stop STO2, a third lens element L3 having positive refractive power, a fourth lens element L4 having negative refractive power, a fifth lens element L5 having negative refractive power, a sixth lens element L6 having negative refractive power, a seventh lens element L7 having positive refractive power, and an eighth lens element L8 having negative refractive power, and the surface profiles of the lenses of the optical system 10 are as follows:

[0245] The object-side surface S1 of the first lens L1 is convex near the optical axis, and the image-side surface S2 is concave near the optical axis; the object-side surface S1 is concave near the maximum effective aperture, and the image-side surface S2 is convex near the maximum effective aperture.

[0246] The object-side surface S3 of the second lens L2 is convex near the optical axis, and the image-side surface S4 is concave near the optical axis; the object-side surface S3 is convex near the maximum effective aperture, and the image-side surface S4 is concave near the maximum effective aperture.

[0247] The object-side surface S5 of the third lens L3 is convex near the optical axis, and the image-side surface S6 is convex near the optical axis; the object-side surface S5 is concave near the maximum effective aperture, and the image-side surface S6 is concave near the maximum effective aperture.

[0248] The object-side surface S7 of the fourth lens L4 is convex near the optical axis, and the image-side surface S8 is concave near the optical axis; the object-side surface S7 is convex near the maximum effective aperture, and the image-side surface S8 is concave near the maximum effective aperture.

[0249] The object-side surface S9 of the fifth lens L5 is concave near the optical axis, and the image-side surface S10 is convex near the optical axis; the object-side surface S9 is convex near the maximum effective aperture, and the image-side surface S10 is convex near the maximum effective aperture.

[0250] The object-side surface S11 of the sixth lens L6 is convex near the optical axis, and the image-side surface S12 is concave near the optical axis; the object-side surface S11 is convex near the maximum effective aperture, and the image-side surface S12 is concave near the maximum effective aperture.

[0251] The object-side surface S13 of the seventh lens L7 is convex near the optical axis, and the image-side surface S14 is convex near the optical axis; the object-side surface S13 is concave near the maximum effective aperture, and the image-side surface S14 is convex near the maximum effective aperture.

[0252] The object-side surface S15 of the eighth lens L8 is concave near the optical axis, and the image-side surface S16 is concave near the optical axis; the object-side surface S15 is concave near the maximum effective aperture, and the image-side surface S16 is convex near the maximum effective aperture.

[0253] The parameters of each lens of the optical system 10 in this embodiment are given in Table 13 and Table 14, wherein the definitions of each component name and parameter can be obtained from the first embodiment and are not repeated here.

[0254] Table 13

[0255]

[0256]

[0257] Table 14

[0258] Surface number S1 S2 S3 S4 S5 S6 S7 S8 K 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 1.800E+01 A4 -3.287E-04 -1.758E-02 -3.851E-02 -2.471E-02 -9.033E-03 2.080E-02 7.684E-03 -8.315E-03 A6 2.609E-03 8.015E-03 1.400E-02 7.821E-03 -1.911E-03 -8.659E-02 -6.823E-02 -1.826E-02 A8 -3.245E-03 -1.953E-03 4.679E-04 4.134E-03 -3.111E-04 1.188E-01 7.963E-02 2.141E-02 A10 2.805E-03 4.687E-05 -3.002E-03 -5.422E-03 -1.190E-03 -1.192E-01 -6.909E-02 -1.808E-02 A12 -1.528E-03 7.534E-05 1.582E-03 2.794E-03 1.117E-03 7.800E-02 3.695E-02 9.694E-03 A14 5.346E-04 9.008E-06 -4.120E-04 -7.497E-04 -5.061E-04 -3.191E-02 -1.064E-02 -3.255E-03 A16 -1.171E-04 -1.679E-05 5.338E-05 1.071E-04 1.219E-04 7.895E-03 1.244E-03 6.827E-04 A18 1.481E-05 4.388E-06 -1.572E-06 -9.181E-06 -1.242E-05 -1.091E-03 4.767E-05 -8.262E-05 A20 -8.499E-07 -3.767E-07 -1.655E-07 1.273E-06 0.000E+00 6.539E-05 -1.609E-05 4.438E-06 Surface number S9 S10 S11 S12 S13 S14 S15 S16 K 0.000E+00 3.431E+00 1.246E+01 -7.764E+00 -1.000E+00 0.000E+00 0.000E+00 -7.185E-01 A4 -1.402E-02 -9.707E-03 1.700E-02 -1.113E-01 -9.135E-02 6.188E-02 -5.611E-02 -6.735E-02 A6 -7.724E-03 -1.313E-02 -2.463E-03 7.120E-02 4.148E-02 -4.344E-02 1.889E-03 1.421E-02 A8 2.365E-03 6.104E-03 -6.070E-03 -3.117E-02 -2.125E-02 1.476E-02 2.560E-03 -2.250E-03 A10 7.590E-03 -1.587E-03 4.031E-03 8.884E-03 7.902E-03 -3.205E-03 -5.418E-04 2.640E-04 A12 -8.393E-03 4.801E-04 -1.494E-03 -1.763E-03 -2.055E-03 4.278E-04 4.937E-05 -2.265E-05 A14 3.940E-03 -1.715E-04 3.525E-04 2.462E-04 3.466E-04 -3.185E-05 -2.010E-06 1.355E-06 A16 -9.569E-04 4.166E-05 -5.137E-05 -2.264E-05 -3.524E-05 9.784E-07 2.781E-09 -5.294E-08 A18 1.179E-04 -5.157E-06 4.149E-06 1.197E-06 1.951E-06 1.389E-08 2.469E-09 1.206E-09 A20 -5.857E-06 2.451E-07 -1.400E-07 -2.706E-08 -4.511E-08 -1.162E-09 -5.836E-11 -1.211E-11

[0259] The optical system 10 in this embodiment satisfies the following relationship:

[0260] f678 / f6 8.179 f / (sd82-sd11) 2.465 ImgH / FNO(mm) 3.720 (r62+r71) / (|sag62|+|sag71|) 6.048 TTL / ImgH 1.397 ct78 / ct23 1.859 f345 / f12 11.354 (|sag81|-|sag72|) / et78 1.585 (f1+|f2|) / (r12+r22) 2.428 sds / (sd81-sd31) 0.749 ct37 / et37 1.373 zh78 / zb78 12.152 zh67 / zb67 5.591 |jd22| / 45° 0.667 |jd31| / 45° 0.502

[0261] Depend on Figure 14As can be seen from the various aberration diagrams in the figure, the longitudinal spherical aberration, field curvature, astigmatism, and distortion of the optical system 10 are all well controlled. The focus shift at each reference wavelength is controlled within ±0.05mm. At the same time, the meridional field curvature and sagittal field curvature at each field of view are both controlled within ±0.025mm. The degree of image curvature is effectively suppressed, the astigmatism is well adjusted, and the maximum distortion is also controlled within 2.5%. Therefore, it can be judged that the optical system 10 of this embodiment can achieve clear imaging.

[0262] The optical system 10 provided by the above embodiments can achieve a miniaturized structure while maintaining good imaging quality.

[0263] refer to Figure 15 , an embodiment of the present application further provides a camera module 20, which includes an optical system 10 and an image sensor 210. The image sensor 210 is arranged on the image side of the optical system 10, and the two can be fixed by a bracket. The image sensor 210 can be a CCD sensor (Charge Coupled Device) or a CMOS sensor (Complementary Metal Oxide Semiconductor). Generally, during assembly, the imaging surface S17 of the optical system 10 overlaps with the photosensitive surface of the image sensor 210. By adopting the above-mentioned optical system 10, the camera module 20 can achieve a miniaturized structural design while maintaining good imaging quality.

[0264] refer to Figure 16 , some embodiments of the present application further provide an electronic device 30. The electronic device 30 includes a fixing part 310, and the camera module 20 is installed on the fixing part 310. The fixing part 310 may be a display screen, a circuit board, a middle frame, a back cover and other components. The electronic device 30 may be, but is not limited to, a smart phone, a smart watch, smart glasses, an e-book reader, a tablet computer, a biometric device (such as a fingerprint recognition device or a pupil recognition device, etc.), a PDA (Personal Digital Assistant), etc. Since the above-mentioned camera module 20 can maintain good imaging quality while compressing the total length, when the above-mentioned camera module 20 is adopted, the electronic device 30 can assemble the above-mentioned camera module 20 with a smaller space, so that the thickness of the device can be compressed while maintaining good camera performance.

[0265] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0266] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. An optical system, characterized in that: The optical system is composed of eight lenses with refractive power. The optical system includes the following components 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 near the optical axis and the image-side surface of the first lens is concave near the optical axis; a second lens having negative refractive power, wherein the object-side surface of the second lens is convex near the optical axis and the image-side surface of the second lens is concave near the optical axis; a third lens having refractive power; a fourth lens having refractive power; a fifth lens having refractive power; a sixth lens element having negative refractive power, wherein the image-side surface of the sixth lens element is concave near the optical axis; a seventh lens element having positive refractive power, wherein the object-side surface of the seventh lens element is convex near the optical axis, and both the object-side surface and the image-side surface of the seventh lens element are aspherical, and at least one of the surfaces is recurved; an eighth lens element having negative refractive power, wherein the image-side surface of the eighth lens element is concave near the optical axis, and both the object-side surface and the image-side surface of the eighth lens element are aspherical, and at least one of the surfaces is recurved; The optical system also satisfies the relationship: 2.5<f678 / f6<8.5, 1.5≤FNO<1.85, 2<f / (sd82-sd11)<2.5; f678 is the combined focal length of the sixth lens, the seventh lens, and the eighth lens, f6 is the effective focal length of the sixth lens, FNO is the aperture number of the optical system, f is the effective focal length of the optical system, sd11 is half of the maximum effective aperture of the object side surface of the first lens, and sd82 is half of the maximum effective aperture of the image side surface of the eighth lens.

2. The optical system according to claim 1, wherein The optical system satisfies the relationship: ImgH / FNO>2.9 mm; ImgH is half of the image height corresponding to the maximum field angle of the optical system, and FNO is the aperture number of the optical system.

3. The optical system according to claim 1, wherein: The optical system satisfies the relationship: 1.28≤TTL / ImgH<1.4; 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, and ImgH is half of the image height corresponding to the maximum field angle of the optical system.

4. The optical system according to claim 1, wherein: The optical system satisfies the relationship: 5<f345 / f12<15; f345 is the combined focal length of the third lens, the fourth lens, and the fifth lens, and f12 is the combined focal length of the first lens and the second lens.

5. The optical system according to claim 4, wherein: The optical system satisfies the relationship: 6.985≤f345 / f12≤13.

499.

6. The optical system according to claim 1, wherein: The optical system satisfies the relationship: 1.5<(f1+|f2|) / (r12+r22)<3; f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, r12 is the curvature radius of the image side surface of the first lens at the optical axis, and r22 is the curvature radius of the image side surface of the second lens at the optical axis.

7. The optical system according to claim 1, wherein: The optical system satisfies the relationship: 1.23≤ct37 / et37<1.4; ct37 is the sum of the thicknesses of each lens from the third lens to the seventh lens on the optical axis, and et37 is the sum of the distances from the maximum effective aperture on the object side to the maximum effective aperture on the image side of each lens from the third lens to the seventh lens in the direction of the optical axis.

8. The optical system according to claim 1, wherein: The optical system satisfies the relationship: 5.5<(r62+r71) / (|sag62|+|sag71|)<7.5; r62 is the curvature radius of the image side surface of the sixth lens at the optical axis, r71 is the curvature radius of the object side surface of the seventh lens at the optical axis, sag62 is the sag height of the image side surface of the sixth lens at the maximum effective aperture, and sag71 is the sag height of the object side surface of the seventh lens at the maximum effective aperture.

9. The optical system according to claim 1, wherein: The optical system satisfies the relationship: 1.7<ct78 / ct23<2.0; ct23 is the distance from the image side surface of the second lens to the object side surface of the third lens on the optical axis, and ct78 is the distance from the image side surface of the seventh lens to the object side surface of the eighth lens on the optical axis.

10. The optical system according to claim 1, wherein: The optical system satisfies the relationship: 0.6<(|sag81|-|sag72|) / et78<1.6; sag72 is the sag height of the image side surface of the seventh lens at the maximum effective aperture, sag81 is the sag height of the object side surface of the eighth lens at the maximum effective aperture, and et78 is the distance from the maximum effective aperture of the image side surface of the seventh lens to the maximum effective aperture of the object side surface of the eighth lens in the direction of the optical axis.

11. The optical system according to claim 1, wherein: The optical system includes a vignetting stop disposed between the second lens and the third lens, and the optical system satisfies the relationship: 0.5<sds / (sd81-sd31)<0.8; sds is the maximum effective aperture of the vignetting stop, sd31 is the maximum effective aperture of the object side of the third lens, and sd81 is the maximum effective aperture of the object side of the eighth lens.

12. The optical system according to claim 1, wherein: The optical system satisfies the relationship: 9.5<zh78 / zb78<12.2; zh78 is the maximum distance between the image side surface of the seventh lens and the object side surface of the eighth lens in the optical axis direction, and zb78 is the shortest distance between the image side surface of the seventh lens and the object side surface of the eighth lens in the optical axis direction.

13. The optical system according to claim 1, wherein: The optical system satisfies the relationship: 4.2<zh67 / zb67<7.5; zh67 is the maximum distance from the image side surface of the sixth lens to the object side surface of the seventh lens in the optical axis direction, and zb67 is the shortest distance from the image side surface of the sixth lens to the object side surface of the seventh lens in the optical axis direction.

14. The optical system according to claim 1, wherein: The optical system includes a vignetting stop disposed between the second lens and the third lens, and the optical system satisfies the relationship: 0.64<|jd22| / 45°<0.67; jd22 is the maximum acute angle formed by the tangent plane at each position of the image-side surface of the second lens and the plane perpendicular to the optical axis.

15. The optical system according to claim 1, wherein The optical system includes a vignetting stop disposed between the second lens and the third lens, and the optical system satisfies the relationship: 0.41<|jd31| / 45°<0.51; jd31 is the maximum acute angle formed by the tangent plane at each position of the object-side surface of the third lens and the plane perpendicular to the optical axis.

16. A camera module, characterized in that: The optical system comprises an image sensor and the optical system according to any one of claims 1 to 15, wherein the image sensor is arranged on the image side of the optical system.

17. An electronic device, characterized in that: It comprises a fixing part and the camera module according to claim 16, wherein the camera module is arranged on the fixing part.

Images