Optical systems, imaging modules and electronic devices

Abstract

The present invention relates to an optical system, an imaging module, and an electronic device. The optical system includes, from the object side to the image side, a first lens with positive refractive power, the object side surface of the first lens being a convex surface at the circumference; a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens with refractive power, and an eighth lens with negative refractive power, the image side surface of the seventh lens being a concave surface at the optical axis. In addition, the optical system satisfies 1<TTL / L<2.5; wherein 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. The optical system also includes a diaphragm, and L is the effective aperture diameter of the diaphragm. An optical system that satisfies the above relationship has the characteristics of large aperture and large aperture, and has the ability to obtain high-quality images in a dark environment.

Description

Technical Field

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

[0002] With the development of society, the use of electronic products such as mobile phones, tablets, drones, and computers has become increasingly widespread. For electronic products with camera functions, most of them produce low-quality images in dark environments, failing to meet the public's demand for high-quality photography in low-light conditions such as cloudy days and at night. Therefore, improvements to camera modules in electronic products have gradually become a focus of public attention. Summary of the Invention

[0003] Based on this, it is necessary to provide an optical system, an imaging module and an electronic device to solve the problem of how to improve the shooting quality in a low-light environment.

[0004] An optical system, comprising, from the object side to the image side, the following:

[0005] a first lens having positive refractive power, wherein the object-side surface of the first lens is convex at the circumference;

[0006] a second lens having refractive power;

[0007] a third lens having refractive power;

[0008] a fourth lens having refractive power;

[0009] a fifth lens having refractive power;

[0010] a sixth lens having refractive power;

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

[0012] an eighth lens element having negative refractive power;

[0013] The optical system satisfies the following relationship:

[0014] 1<TTL / L<2.5;

[0015] Wherein, 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. The optical system further includes an aperture, and L is the effective aperture diameter of the aperture.

[0016] When the above relationship is met, the optical system has the characteristics of large diameter and large aperture in performance, has the ability to obtain high-quality images in dark light environments such as night scenes, starry sky, cloudy days, etc., and has high image clarity. In addition, it also has the characteristics of miniaturization in structure.

[0017] In one embodiment, the optical system satisfies the following relationship:

[0018] f14>0;

[0019] f58<0;

[0020] Wherein, f14 is the combined focal length of the first, second, third, and fourth lenses, and f58 is the combined focal length of the fifth, sixth, seventh, and eighth lenses. When the above relationship is satisfied, the first, second, third, and fourth lenses form a first lens group with positive refractive power, and the fifth, sixth, seventh, and eighth lenses form a second lens group with negative refractive power. The positive and negative refractive powers of the first and second lens groups cooperate to correct field curvature, distortion, and aberrations.

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

[0022] -0.7<f14 / f58<-0.1.

[0023] The first, second, third, and fourth lenses combine to form a first lens group with positive refractive power, while the fifth, sixth, seventh, and eighth lenses combine to form a second lens group with negative refractive power. The positive and negative refractive powers of the first and second lens groups cooperate to correct aberrations, field curvature, and distortion. However, when f14 / f58 ≥ -0.1, the negative refractive power of the optical system is insufficient, making it difficult to correct for phase aberrations. When f14 / f58 ≤ -0.7, the positive refractive power of the optical system is excessive, making it difficult to correct for distortion and resulting in reduced image quality.

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

[0025] 0.20<Fno / TTL<0.35;

[0026] Wherein, Fno is the aperture number of the optical system, and TTL is the distance from the object side of the first lens to the imaging plane of the optical system on the optical axis, with the unit of TTL being mm. When the above relationship is satisfied, the optical system has the characteristics of large aperture and miniaturization.

[0027] In one embodiment, the optical system satisfies the following relationship:

[0028] Fno<2.0. When the above relationship is satisfied, the optical system can be miniaturized while also having a large aperture, so that the optical system has sufficient light input, thereby being able to obtain high-quality images in dark environments such as night scenes and starry skies.

[0029] In one embodiment, the optical system satisfies the following relationship:

[0030] TTL / Imgh<1.5;

[0031] Wherein, TTL is the distance on the optical axis from the object side of the first lens to the imaging plane of the optical system, and Imgh is half the diagonal length of the effective pixel area on the imaging plane. TTL / Imgh determines the structural size of the optical system. Therefore, when the above relationship is satisfied, the optical system can achieve a miniaturized design. In addition, the optical system has a large image height to meet the design requirements of 48M (48 million pixels).

[0032] In one embodiment, the optical system satisfies the following relationship:

[0033] 1.0<TTL / |f|<1.5;

[0034] Wherein, TTL is the distance on the optical axis from the object side of the first lens to the imaging surface of the optical system, and f is the effective focal length of the optical system. When the above relationship is satisfied, the optical system can effectively balance the aberrations generated by the first lens. When TTL / |f| ≤ 1.0, the optical length of the optical system is too short, resulting in increased system sensitivity and difficulty in correcting aberrations. When TTL / |f| ≥ 1.5, the optical length of the optical system is too long, resulting in a too large chief ray angle for light entering the imaging surface. This prevents light reaching the edge of the imaging surface from forming an image on the photosensitive surface, resulting in incomplete imaging information.

[0035] In one embodiment, the optical system satisfies the following relationship:

[0036] f / f1≤1.2;

[0037] Where f is the effective focal length of the optical system, and f1 is the effective focal length of the first lens. All optical information acquired by the optical system must pass through the first lens. The focal length of the first lens determines the optical system's acquisition of object-space light information. Satisfying this relationship reduces the sensitivity of the optical system, lowers the difficulty of manufacturing, and reduces the difficulty of correcting aberrations generated by the first lens.

[0038] In one embodiment, the optical system satisfies the following relationship:

[0039] -0.10<(R9+R10) / (R9*R10)<0.25;

[0040] Wherein, R9 is the radius of curvature of the object-side surface of the fourth lens element at the optical axis, and R10 is the radius of curvature of the image-side surface of the fourth lens element at the optical axis. Both R9 and R10 are expressed in mm. When the above relationship is satisfied, the radii of curvature of the object-side and image-side surfaces of the fourth lens element are properly matched, thereby effectively improving the astigmatism of the optical system and enhancing the molding yield of the fourth lens element.

[0041] In one embodiment, the optical system satisfies the following relationship:

[0042] 0.5<(R3+R4) / f1<3.5;

[0043] Where R3 is the radius of curvature of the object-side surface of the first lens at the optical axis, R4 is the radius of curvature of the image-side surface of the first lens at the optical axis, and f1 is the effective focal length of the first lens. When (R3 + R4) / f1 ≥ 3.5, the optical system becomes more difficult to correct for aberrations. When (R3 + R4) / f1 ≤ 0.5, the optical system is less able to acquire object space light information, making it difficult to achieve optimal imaging results.

[0044] In one embodiment, the optical system satisfies the following relationship:

[0045] 0.8<R5 / R6<3.5;

[0046] Where R5 is the radius of curvature of the object-side surface of the second lens at the optical axis, and R6 is the radius of curvature of the image-side surface of the second lens at the optical axis. The second lens provides negative refractive power to balance the distortion produced by the first lens and correct for aberrations introduced by the first lens. When R5 / R6 ≥ 3.5, distortion correction will be excessive; when R5 / R6 ≤ 0.8, distortion correction will not be achieved.

[0047] In one embodiment, the optical system satisfies the following relationship:

[0048] 8<|R7+R8| / |R7-R8|<48;

[0049] Where R7 is the radius of curvature of the object-side surface of the third lens at the optical axis, and R8 is the radius of curvature of the image-side surface of the third lens at the optical axis. When this relationship is satisfied, the radii of curvature of the object-side surface and the image-side surface of the third lens are properly matched, allowing the incident angle to be reasonably increased to meet the image height requirements of the optical system, while also reducing system sensitivity and improving assembly stability.

[0050] In one embodiment, the optical system satisfies the following relationship:

[0051] -0.6<f1 / f2<0.1;

[0052] Wherein, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens. When the above relationship is satisfied, the position chromatic aberration of the optical system can be effectively corrected.

[0053] In one embodiment, the optical system satisfies the following relationship:

[0054] 1.8<(R17*R18) / (R17-R18)<3;

[0055] Wherein, R17 is the radius of curvature of the object-side surface of the eighth lens element at the optical axis, and R18 is the radius of curvature of the image-side surface of the eighth lens element at the optical axis. Both R17 and R18 are expressed in mm. When the above relationship is satisfied, the radii of curvature of the object-side surface and the image-side surface of the eighth lens element are properly matched, effectively correcting spherical aberration of the optical system, improving distortion and astigmatism, while reducing system sensitivity and improving assembly stability.

[0056] In one embodiment, the optical system satisfies the following relationship:

[0057] 0.5<ΣCT / f<0.8;

[0058] Wherein, ΣCT is the sum of the center thicknesses of the lenses in the optical system, and f is the effective focal length of the optical system. When the above relationship is satisfied, the optical system has a more compact structure and an effective focal length adapted to the structure, thereby meeting the requirements of miniaturization design.

[0059] In one embodiment, the optical system satisfies the following relationship:

[0060] 0.40<ΣCT / TTL<0.62;

[0061] Where ΣCT is the sum of the center thicknesses of all lenses in the optical system, and 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. When the above relationship is satisfied, the optical system has good assembly stability, which is conducive to miniaturization design.

[0062] In one embodiment, the optical system satisfies the following relationship:

[0063] 0.20<ET1 / CT1<0.60;

[0064] Where ET1 is the edge thickness of the first lens, and CT1 is the center thickness of the first lens. All optical information obtained by the optical system must pass through the first lens, and corresponding aberrations, distortions, and field curvatures are also generated by the first lens. Therefore, the ratio of the edge thickness to the center thickness of the first lens should not be too large. A too large ratio will make subsequent aberration correction difficult and will also produce significant distortion and field curvature, failing to meet optical performance requirements. When the above relationship is satisfied, a well-balanced optical system can be obtained, balancing the system's aberrations, distortions, and field curvatures to meet high-quality photography requirements.

[0065] In one embodiment, the optical system satisfies the following relationship:

[0066] 0.80<ET8 / CT8<3.00;

[0067] Where ET8 is the edge thickness of the eighth lens, and CT8 is the center thickness of the eighth lens. The eighth lens is a key component for final correction of the optical system's aberration performance and is relatively difficult to manufacture. The ratio of edge thickness to center thickness should not be too large. Meeting this relationship ensures that the eighth lens has good optical performance and a high molding yield.

[0068] An imaging module comprises a photosensitive element and the optical system described in any one of the above embodiments, wherein the photosensitive element is arranged on the image side of the optical system.

[0069] An electronic device includes the imaging module described in the above embodiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] Figure 1 A schematic diagram of an optical system provided in the first embodiment of the present application;

[0071] Figure 2 : The longitudinal spherical aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of the optical system in the first embodiment;

[0072] Figure 3 A schematic diagram of an optical system provided in accordance with a second embodiment of the present application;

[0073] Figure 4 : is the longitudinal spherical aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of the optical system in the second embodiment;

[0074] Figure 5 A schematic diagram of an optical system provided in a third embodiment of the present application;

[0075] Figure 6 : longitudinal spherical aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of the optical system in the third embodiment;

[0076] Figure 7 A schematic diagram of an optical system provided in a fourth embodiment of the present application;

[0077] Figure 8 : longitudinal spherical aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of the optical system in the fourth embodiment;

[0078] Figure 9 A schematic diagram of an optical system provided in a fifth embodiment of the present application;

[0079] Figure 10 1 is a diagram of longitudinal spherical aberration (mm), astigmatism (mm), and distortion (%) of the optical system in the fifth embodiment;

[0080] Figure 11 A schematic diagram of an optical system provided in accordance with a sixth embodiment of the present application;

[0081] Figure 12 : longitudinal spherical aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of the optical system in the sixth embodiment;

[0082] Figure 13 A schematic diagram of an optical system provided in a seventh embodiment of the present application;

[0083] Figure 14 2 are the longitudinal spherical aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of the optical system in the seventh embodiment;

[0084] Figure 15 A schematic diagram of an optical system provided in an eighth embodiment of the present application;

[0085] Figure 16 2 are the longitudinal spherical aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of the optical system in the eighth embodiment;

[0086] Figure 17 A schematic diagram of an optical system provided in a ninth embodiment of the present application;

[0087] Figure 18 : longitudinal spherical aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of the optical system in the ninth embodiment;

[0088] Figure 19 A schematic diagram of an optical system provided in the tenth embodiment of the present application;

[0089] Figure 20 10. The longitudinal spherical aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of the optical system in the tenth embodiment;

[0090] Figure 21A schematic diagram of an optical system provided in accordance with the eleventh embodiment of the present application;

[0091] Figure 22 14 is a longitudinal spherical aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of the optical system in the eleventh embodiment;

[0092] Figure 23 A schematic diagram of an optical system provided in the twelfth embodiment of the present application;

[0093] Figure 24 14 is a longitudinal spherical aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of the optical system in the twelfth embodiment;

[0094] Figure 25 A schematic diagram of an optical system provided in the thirteenth embodiment of the present application;

[0095] Figure 26 13. The longitudinal spherical aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of the optical system in the thirteenth embodiment;

[0096] Figure 27 A schematic diagram of an optical system provided in the fourteenth embodiment of the present application;

[0097] Figure 28 14. FIG14 is a longitudinal spherical aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of the optical system in Example 14;

[0098] Figure 29 A schematic diagram of an imaging module provided in one embodiment of the present application;

[0099] Figure 30 A schematic diagram of an electronic device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0100] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of the present invention. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive disclosure of the present invention.

[0101] It should be noted that when an element is referred to as being "fixed to" another component, it may be directly on the other component or there may be a central element. When an element is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central element at the same time. In contrast, when an element is referred to as being "directly on" another component, there is no intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0102] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0103] The optical system provided in this application can be applied to but not limited to electronic devices such as mobile phones, tablet computers, drones, and computers, so that users can obtain high-quality images in dark environments.

[0104] refer to Figure 1 The optical system 100 of an embodiment of the present application includes, from the object side to the image side, 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.

[0105] The first lens L1 includes an object-side surface S1 and an image-side surface S2; the second lens L2 includes an object-side surface S3 and an image-side surface S4; the third lens L3 includes an object-side surface S5 and an image-side surface S6; the fourth lens L4 includes an object-side surface S7 and an image-side surface S8; the fifth lens L5 includes an object-side surface S9 and an image-side surface S10; the sixth lens L6 includes an object-side surface S11 and an image-side surface S12; the seventh lens L7 includes an object-side surface S13 and an image-side surface S14; and the eighth lens L8 includes an object-side surface S15 and an image-side surface S16. Furthermore, the optical system 100 further includes an imaging surface S19 on the image side of the eighth lens L8. This imaging surface S19 may be a photosensitive surface of a photosensitive element.

[0106] The object-side surface S1 of the first lens L1 is convex along the optical axis; the object-side surface S3 of the second lens L2 is convex along the optical axis; the object-side surface S13 of the seventh lens L7 is convex along the optical axis, and the image-side surface S14 is concave; the object-side surface S15 of the eighth lens L8 is convex along the optical axis, and the image-side surface S16 is concave along the optical axis.

[0107] It should be noted that when a side surface of a lens is described as convex at the optical axis (the central area of ​​the side surface), it can be understood that the area of ​​the side surface of the lens near the optical axis is convex, and therefore the side surface can also be considered convex near the axis; when a side surface of a lens is described as concave at the circumference, it can be understood that the area of ​​the side surface near the maximum effective radius is concave. For example, when the side surface is convex at the optical axis and also convex at the circumference, the shape of the side surface from the center (optical axis) to the edge can be purely convex; or it can first transition from a convex shape at the center to a concave shape, and then become convex near the maximum effective radius. This is only an example to illustrate the relationship between the optical axis and the circumference. The various shape structures (concave-convex relationship) of the side surface are not fully reflected, but other situations can be deduced based on the above examples.

[0108] In some embodiments, the object-side surface or the image-side surface of the lens in the optical system 100 may be an aspheric surface. The surface shape formula of the aspheric surface is:

[0109]

[0110] Where Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, r is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the aspheric vertex (at the optical axis), k is the cone constant, and Ai is the coefficient corresponding to the i-th higher-order term in the aspheric surface shape formula.

[0111] In some embodiments, the object-side surface and the image-side surface of each lens in the optical system 100 (the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8) are aspherical surfaces.

[0112] In some embodiments, each lens in the optical system 100 is made of plastic. In this case, lenses made of plastic can reduce the weight of the optical system 100 and lower production costs. In other embodiments, each lens in the optical system 100 is made of glass. In this case, the optical system 100 can withstand higher temperatures and has better optical performance. In other embodiments, the first lens L1 is made of glass, while the other lenses are made of plastic. In this case, the first lens L1 closest to the object side can well withstand the influence of the ambient temperature on the object side, and because the other lenses are made of plastic, the optical system 100 can also maintain a low production cost. It should be noted that, depending on actual needs, the material of each lens in the optical system 100 can be either plastic or glass.

[0113] In some embodiments, an aperture STO is provided in the optical system 100, and the aperture STO may be disposed on the object side of the first lens element L1. However, it should be noted that when the aperture STO is described as being disposed on the object side of the first lens element L1, or when the optical system 100 is described as being sequentially provided with the aperture STO, the first lens element L1, and the second lens element L2 from the object side to the image side, the projection of the aperture STO on the optical axis of the first lens element L1 may or may not overlap with the projection of the first lens element L1 on the optical axis.

[0114] In some embodiments, an infrared cutoff filter L9 is further disposed on the image side of the eighth lens L8. The infrared cutoff filter L9 includes an object-side surface S17 and an image-side surface S18. The infrared cutoff filter L9 filters infrared light, preventing it from passing through and reaching the photosensitive element. This prevents infrared interference light from being received by the photosensitive element and affecting normal imaging, thereby improving the imaging quality of the optical system 100. In some embodiments, the infrared cutoff filter L9 can be assembled with the photosensitive element and mounted on the image side of the optical system 100. Alternatively, the infrared cutoff filter L9 can be directly disposed in the optical system 100, so as to be integrated with the various lenses.

[0115] In some embodiments, in order to make the parameter definitions and effect descriptions of the present application clearer and more complete, the optical system 100 may include any elements such as reflectors, apertures, filters, protective glass, and photosensitive elements in addition to lenses with refractive power.

[0116] In some embodiments, the optical system 100 satisfies the following relationship: 1<TTL / L<2.5, where TTL is the distance along the optical axis from the object-side surface S1 of the first lens element L1 to the imaging surface S19 of the optical system 100, and L is the effective aperture diameter of the stop STO. TTL / L can be 1.76, 1.78, 1.80, 1.81, 1.85, 1.90, 1.95, 2.10, 2.20, 2.25, or 2.30.

[0117] When the above relationship is met, the optical system 100 has the characteristics of large diameter and large aperture in performance, and has the ability to obtain high-quality images in dark light environments such as cloudy days, night scenes, and starry skies, and the image quality is high; in addition, the optical system 100 also has the characteristics of miniaturization in structure.

[0118] In some embodiments, the optical system 100 satisfies the following relationship: f14>0; f58<0; where f14 is the combined focal length of the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4, and f58 is the combined focal length of the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8. f14 can be 5.20, 5.22, 5.25, 5.30, 5.35, 5.40, 5.50, 5.60, 5.70, 5.80, 5.85, 5.90 or 5.92; f58 can be -30.00, -28.00, -25.00, -23.00, -20.00, -15.00, -14.50, -14.00, -10.00, -9.50, -9.30, -9.10, -8.50, -8.40 or -8.30. The unit of f14 and f58 is mm. When the above relationship is satisfied, the first lens group L1, the second lens group L2, the third lens group L3, and the fourth lens group L4 form a first lens group with positive refractive power, while the fifth lens group L5, the sixth lens group L6, the seventh lens group L7, and the eighth lens group L8 form a second lens group with negative refractive power. The positive and negative refractive powers of the first and second lens groups cooperate to correct field curvature, distortion, and aberrations.

[0119] In some embodiments, optical system 100 satisfies the following relationship: -0.7 < f14 / f58 < -0.1; first lens L1, second lens L2, third lens L3, and fourth lens L4 combine to form a first lens group with positive refractive power, and fifth lens L5, sixth lens L6, seventh lens L7, and eighth lens L8 combine to form a second lens group with negative refractive power. f14 / f58 can be -0.60, -0.57, -0.50, -0.45, -0.37, -0.35, -0.30, -0.25, -0.22, -0.20, or -0.19. The first lens group and the second lens group can cooperate to correct aberrations, field curvature, and distortion. When f14 / f58≥-0.1, the negative refractive power of the optical system 100 is insufficient, making it difficult to correct the position difference; when f14 / f58≤-0.7, the positive refractive power of the optical system 100 is too large, making it difficult to correct the distortion, resulting in a decrease in shooting quality.

[0120] In some embodiments, the optical system 100 satisfies the following relationship: 0.20<Fno / TTL<0.35;

[0121] Where Fno is the aperture number of optical system 100, and TTL is the distance along the optical axis from the object-side surface S1 of first lens element L1 to the imaging surface S19 of optical system 100. TTL is expressed in mm. Fno / TTL can be 0.24, 0.250, 0.28, 0.30, or 0.32. When this relationship is met, optical system 100 exhibits both a large aperture and compactness.

[0122] In some embodiments, the optical system 100 satisfies the following relationship: Fno < 2.0. Fno can be 1.40, 1.41, 1.42, 1.45, 1.47, 1.48, 1.57, 1.65, 1.70, 1.75, 1.80, 1.84, 1.86, or 1.87. When this relationship is met, the optical system 100 achieves miniaturization while also possessing a large aperture, allowing sufficient light to enter the optical system 100, enabling the capture of high-quality images in dark environments such as night scenes and starry skies.

[0123] In some embodiments, optical system 100 satisfies the following relationship: TTL / Imgh < 1.5, where TTL is the distance along the optical axis from the object-side surface S1 of first lens L1 to the imaging surface S19 of optical system 100, and Imgh is half the diagonal length of the effective pixel area on imaging surface S19. TTL / Imgh can be 1.45, 4.46, 1.47, or 1.48. TTL / Imgh determines the size of optical system 100. Therefore, satisfying this relationship allows for miniaturization of optical system 100. Furthermore, optical system 100 maintains a large image height, meeting 48M design requirements.

[0124] In some embodiments, the optical system 100 satisfies the following relationship: 1.0 < TTL / |f| < 1.5; where TTL is the distance on the optical axis from the object-side surface S1 of the first lens L1 to the imaging surface S19 of the optical system 100, and f is the effective focal length of the optical system 100. TTL / |f| can be 1.21, 1.22, 1.23, or 1.24. When the above relationship is satisfied, the optical system 100 can effectively balance the aberrations generated by the first lens L1. When TTL / |f| ≤ 1.0, the optical length of the optical system 100 is too short, resulting in increased system sensitivity and difficulty in correcting aberrations. When TTL / |f| ≥ 1.5, the optical length of the optical system 100 is too long, resulting in a too large chief ray angle for light entering the imaging surface S19. This prevents light rays reaching the edge of the imaging surface S19 from forming an image on the photosensitive surface, resulting in incomplete imaging information.

[0125] In some embodiments, the optical system 100 satisfies the following relationship: f / f1 ≤ 1.2, where f is the effective focal length of the optical system 100, and f1 is the effective focal length of the first lens L1. f / f1 can be 0.70, 0.73, 0.75, 0.78, 0.85, 0.92, 0.93, 0.94, 0.97, 1.00, 1.02, 1.04, or 1.08. All optical information acquired by the optical system 100 must pass through the first lens L1. The focal length of the first lens L1 determines how much object-space light information the optical system 100 acquires. Satisfying this relationship reduces the sensitivity of the optical system 100, reduces manufacturing complexity, and reduces the difficulty of correcting aberrations generated by the first lens L1.

[0126] In some embodiments, the optical system 100 satisfies the following relationship: -0.10 < (R9 + R10) / (R9 * R10) < 0.25; where R9 is the radius of curvature of the object-side surface S7 of the fourth lens element L4 at the optical axis, and R10 is the radius of curvature of the image-side surface S8 of the fourth lens element L4 at the optical axis. Both R9 and R10 are expressed in mm. (R9 + R10) / (R9 * R10) can be -0.07, -0.06, -0.05, 0.10, 0.15, 0.20, or 0.21. When this relationship is satisfied, the radii of curvature of the object-side surface S7 and the image-side surface S8 of the fourth lens element L4 are appropriately matched, thereby effectively improving the astigmatism of the optical system 100 and enhancing the manufacturing yield of the fourth lens element L4.

[0127] In some embodiments, the optical system 100 satisfies the following relationship: 0.5 < (R3 + R4) / f1 < 3.5, where R3 is the radius of curvature of the object-side surface S1 of the first lens element L1 at the optical axis, R4 is the radius of curvature of the image-side surface S2 of the first lens element L1 at the optical axis, and f1 is the effective focal length of the first lens element L1. (R3 + R4) / f1 can be 0.88, 0.90, 0.92, 1.00, 1.30, 1.70, 2.00, 2.55, 2.60, 2.70, 2.90, 3.00, 3.10, 3.15, or 3.20. When (R3 + R4) / f1 ≥ 3.5, it becomes more difficult for the optical system 100 to correct for aberrations. When (R3 + R4) / f1 ≤ 0.5, it is difficult for the optical system 100 to obtain object space light information, making it difficult to achieve optimal imaging effects.

[0128] In some embodiments, the optical system 100 satisfies the following relationship: 0.8<R5 / R6<3.5; wherein R5 is the radius of curvature of the object-side surface S3 of the second lens L2 at the optical axis, and R6 is the radius of curvature of the image-side surface S4 of the second lens L2 at the optical axis. The second lens L2 provides negative refractive power to balance the distortion produced by the first lens L1 and correct the aberrations produced by the first lens L1. R5 / R6 can be 1.00, 1.10, 1.20, 1.50, 1.80, 2.00, 2.10, 2.20, 2.30, 2.43, 2.45, 2.50, 2.60, 2.70, 2.80, 2.85 or 2.88. When R5 / R6 ≥ 3.5, the distortion correction will be too large; when R5 / R6 ≤ 0.8, the purpose of correcting the distortion cannot be achieved.

[0129] In some embodiments, the optical system 100 satisfies the following relationship: 8 < |R7+R8| / |R7-R8| < 48; where R7 is the radius of curvature of the object-side surface S5 of the third lens element L3 at the optical axis, and R8 is the radius of curvature of the image-side surface S6 of the third lens element L3 at the optical axis. |R7+R8| / |R7-R8| can be 10.00, 11.00, 15.00, 20.00, 25.00, 35.00, 43.00, or 45.00. When this relationship is satisfied, the radii of curvature of the object-side surface S5 and the image-side surface S6 of the third lens element L3 are properly matched, allowing the incident angle to be reasonably increased to meet the image height requirement of the optical system 100, while also reducing system sensitivity and improving assembly stability.

[0130] In some embodiments, optical system 100 satisfies the following relationship: -0.6 < f1 / f2 < 0.1, where f1 is the effective focal length of first lens element L1, and f2 is the effective focal length of second lens element L2. f1 / f2 can be -0.55, -0.54, -0.50, -0.49, -0.47, -0.46, -0.35, -0.30, -0.10, or 0.01. When this relationship is satisfied, positional chromatic aberration of optical system 100 can be effectively corrected.

[0131] In some embodiments, the optical system 100 satisfies the following relationship: 1.8 < (R17*R18) / (R17-R18) < 3; where R17 is the radius of curvature of the object-side surface S15 of the eighth lens element L8 at the optical axis, and R18 is the radius of curvature of the image-side surface S16 of the eighth lens element L8 at the optical axis. Both R17 and R18 are expressed in mm. (R17*R18) / (R17-R18) can be 2.00, 2.10, 2.20, 2.56, 2.58, 2.60, 2.65, 2.70, 2.75, 2.80, 2.85, or 2.87. When this relationship is satisfied, the radii of curvature of the object-side surface S15 and the image-side surface S16 of the eighth lens element L8 are appropriately matched, effectively correcting spherical aberration, improving distortion and astigmatism, while reducing system sensitivity and enhancing assembly stability.

[0132] In some embodiments, optical system 100 satisfies the following relationship: 0.5 < ΣCT / f < 0.8, where ΣCT is the sum of the center thicknesses of the lenses in optical system 100, and f is the effective focal length of optical system 100. ΣCT / f can be 0.70, 0.71, 0.72, 0.73, 0.74, or 0.75. When this relationship is satisfied, optical system 100 has a more compact structure and an effective focal length that is compatible with the structure, thereby enabling miniaturization.

[0133] In some embodiments, optical system 100 satisfies the following relationship: 0.40 < ΣCT / TTL < 0.62, where ΣCT is the sum of the central thicknesses of the lenses in optical system 100, and TTL is the distance along the optical axis from the object-side surface S1 of first lens L1 to the imaging surface S19 of optical system 100. ΣCT / TTL can be 0.57, 0.58, 0.59, 0.60, or 0.61. When this relationship is met, optical system 100 exhibits excellent assembly stability, facilitating miniaturization.

[0134] In some embodiments, the optical system 100 satisfies the following relationship: 0.20 < ET1 / CT1 < 0.60, where ET1 is the edge thickness of the first lens L1 (the thickness of the first lens L1 at its maximum effective radius), and CT1 is the center thickness of the first lens L1. ET1 / CT1 can be 0.26, 0.27, 0.28, 0.30, 0.35, 0.39, 0.42, 0.46, 0.49, 0.53, 0.55, or 0.56. All optical information obtained by the optical system 100 must pass through the first lens L1, and corresponding aberrations, distortion, and field curvature are also generated by the first lens L1. Therefore, the ratio of the edge thickness to the center thickness of the first lens L1 should not be too large. A too large ratio will make subsequent aberration correction difficult and will also result in significant distortion and field curvature, failing to meet optical performance requirements. When the above relationship is satisfied, a well-performing optical system 100 is obtained, balancing the system's aberrations, distortion, and field curvature, meeting high-quality imaging requirements.

[0135] In some embodiments, optical system 100 satisfies the following relationship: 0.80 < ET8 / CT8 < 3.00, where ET8 is the edge thickness of eighth lens element L8 (the thickness of eighth lens element L8 at its maximum effective radius), and CT8 is the center thickness of eighth lens element L8. ET8 / CT8 can be 0.88, 0.90, 0.92, 0.95, 1.00, 1.05, 1.10, 1.13, 1.15, 1.80, 2.10, 2.20, 2.25, or 2.27. Eighth lens element L8 is a key component for final correction of aberrations in optical system 100 and is relatively difficult to manufacture. Therefore, the ratio of its edge thickness to its center thickness should not be too large. Meeting this relationship ensures that eighth lens L8 exhibits good optical performance and a high manufacturing yield.

[0136] Specific embodiments applicable to the optical system 100 will be further described below with reference to the accompanying drawings. However, it should be noted that the figures in the accompanying drawings are for reference only and do not fully represent the actual figures of the corresponding embodiments.

[0137] First embodiment

[0138] refer to Figure 1 In the first embodiment, the optical system 100 includes, from the object side to the image side, an aperture stop STO, a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, a third lens L3 with positive refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with negative refractive power, a sixth lens L6 with positive refractive power, a seventh lens L7 with negative refractive power, and an eighth lens L8 with negative refractive power. Figure 2The diagrams include longitudinal spherical aberration (mm), astigmatism (mm), and distortion (%) of the optical system 100 in the first embodiment, wherein the astigmatism and distortion diagrams are data diagrams at a reference wavelength. The reference wavelength in each embodiment is 555 nm.

[0139] The object-side surface S1 of the first lens L1 is convex at the paraxial position, and the image-side surface S2 of the first lens L1 is concave at the paraxial position; the object-side surface S1 of the first lens L1 is convex at the circumference, and the image-side surface S2 of the first lens L1 is convex at the circumference.

[0140] The object-side surface S3 of the second lens L2 is convex at the paraxial position, and the image-side surface S4 of the second lens L2 is concave at the paraxial position; the object-side surface S3 of the second lens L2 is convex at the circumference, and the image-side surface S4 of the second lens L2 is concave at the circumference.

[0141] The object-side surface S5 of the third lens L3 is convex at the paraxial position, and the image-side surface S6 of the third lens L3 is concave at the paraxial position; the object-side surface S5 of the third lens L3 is concave at the circumference, and the image-side surface S6 of the third lens L3 is concave at the circumference.

[0142] The object-side surface S7 of the fourth lens L4 is convex at the paraxial position, and the image-side surface S8 of the fourth lens L4 is concave at the paraxial position; the object-side surface S7 of the fourth lens L4 is concave at the circumference, and the image-side surface S8 of the fourth lens L4 is convex at the circumference.

[0143] The object-side surface S9 of the fifth lens L5 is convex at the paraxial position, and the image-side surface S10 of the fifth lens L5 is concave at the paraxial position; the object-side surface S9 of the fifth lens L5 is concave at the circumference, and the image-side surface S10 of the fifth lens L5 is convex at the circumference.

[0144] The object-side surface S11 of the sixth lens L6 is convex at the paraxial position, and the image-side surface S12 of the sixth lens L6 is convex at the paraxial position; the object-side surface S11 of the sixth lens L6 is concave at the circumference, and the image-side surface S12 of the sixth lens L6 is convex at the circumference.

[0145] The object-side surface S13 of the seventh lens L7 is convex at the paraxial position, and the image-side surface S14 of the seventh lens L7 is concave at the paraxial position; the object-side surface S13 of the seventh lens L7 is concave at the circumference, and the image-side surface S14 of the seventh lens L7 is convex at the circumference.

[0146] The object-side surface S15 of the eighth lens L8 is convex at the paraxial position, and the image-side surface S16 of the eighth lens L8 is concave at the paraxial position; the object-side surface S15 of the eighth lens L8 is convex at the circumference, and the image-side surface S16 of the eighth lens L8 is convex at the circumference.

[0147] The object-side and image-side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 are all aspherical surfaces. The aspherical design can effectively solve the problem of field of view distortion and also enable the lenses to achieve excellent optical effects while being smaller and thinner, thereby making the optical system 100 have a smaller volume.

[0148] The first lens L1 , the second lens L2 , the third lens L3 , the fourth lens L4 , the fifth lens L5 , the sixth lens L6 , the seventh lens L7 and the eighth lens L8 are all made of plastic.

[0149] In some embodiments, an infrared cutoff filter L9 is further provided on the image side of the eighth lens L8 to filter out infrared light to prevent the photosensitive element from receiving infrared light and affecting normal imaging.

[0150] In the first embodiment, optical system 100 satisfies the relationship: TTL / L = 1.74; where TTL is the distance on the optical axis from the object-side surface S1 of first lens element L1 to the imaging surface S19 of optical system 100, and L is the effective aperture diameter of stop STO. When this relationship is satisfied, optical system 100 exhibits the characteristics of a large aperture and a large diameter, capable of producing high-quality images in low-light environments such as cloudy skies, night scenes, and starry skies, while maintaining high image clarity. Furthermore, it boasts a compact structure.

[0151] Optical system 100 satisfies the following relationships: f14 = 5.51; f58 = -21.71. Here, f14 is the combined focal length of first lens L1, second lens L2, third lens L3, and fourth lens L4, and f58 is the combined focal length of fifth lens L5, sixth lens L6, seventh lens L7, and eighth lens L8. Both f14 and f58 are expressed in mm. When these relationships are met, first lens L1, second lens L2, third lens L3, and fourth lens L4 form a first lens group with positive refractive power, while fifth lens L5, sixth lens L6, seventh lens L7, and eighth lens L8 form a second lens group with negative refractive power. The positive and negative refractive powers of the first and second lens groups complement each other to correct field curvature, distortion, and aberrations.

[0152] Optical system 100 satisfies the relationship: f14 / f58 = -0.25. The first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 form a first lens group with positive refractive power. The fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 form a second lens group with negative refractive power. The first and second lens groups cooperate to correct aberrations, field curvature, and distortion.

[0153] Optical system 100 satisfies the relationship: Fno / TTL = 0.237, where Fno is the aperture number of optical system 100, and TTL is the distance along the optical axis from the object-side surface S1 of first lens element L1 to the imaging surface S19 of optical system 100. TTL is expressed in mm. When this relationship is satisfied, optical system 100 exhibits both a large aperture and compactness.

[0154] The optical system 100 satisfies the relationship: Fno = 1.397. When the above relationship is satisfied, the optical system 100 is compact and has a large aperture, allowing sufficient light to enter the optical system 100, thereby enabling the system to obtain high-quality images in dark environments such as night scenes and starry skies.

[0155] Optical system 100 satisfies the relationship: TTL / Imgh = 1.475; where TTL is the distance along the optical axis from the object-side surface S1 of first lens L1 to the imaging surface S19 of optical system 100, and Imgh is half the diagonal length of the effective pixel area on imaging surface S19. TTL / Imgh determines the size of optical system 100. Therefore, satisfying this relationship allows for miniaturization of optical system 100. Furthermore, optical system 100 maintains a large image height, meeting 48M design requirements.

[0156] Optical system 100 satisfies the relationship: TTL / |f|=1.245; where TTL is the distance along the optical axis from the object-side surface S1 of first lens L1 to the imaging surface S19 of optical system 100, and f is the effective focal length of optical system 100. When TTL / |f| is too small, the optical length of optical system 100 is too short, resulting in increased system sensitivity and difficulty in correcting aberrations. When TTL / |f| is too large, the optical length of optical system 100 is too long, resulting in a large chief ray angle for light entering imaging surface S19. Light rays reaching the edges of imaging surface S19 cannot form an image on the photosensitive surface, resulting in incomplete imaging information.

[0157] Optical system 100 satisfies the relationship: f / f1 = 1.05; where f is the effective focal length of optical system 100, and f1 is the effective focal length of first lens L1. All optical information acquired by optical system 100 must pass through first lens L1. The focal length of first lens L1 determines how much object-space light information is acquired by optical system 100. Satisfying this relationship reduces the sensitivity of optical system 100, easing manufacturing complexity and simplifying the correction of aberrations introduced by first lens L1.

[0158] Optical system 100 satisfies the relationship: (R9 + R10) / (R9 * R10) = 0.13; where R9 is the radius of curvature of the object-side surface S7 of fourth lens element L4 at the optical axis, and R10 is the radius of curvature of the image-side surface S8 of fourth lens element L4 at the optical axis. Both R9 and R10 are expressed in mm. When this relationship is satisfied, the radii of curvature of the object-side surface S7 and image-side surface S8 of fourth lens element L4 are optimally matched, thereby effectively improving astigmatism in optical system 100 and enhancing the manufacturing yield of fourth lens element L4.

[0159] Optical system 100 satisfies the relationship: (R3 + R4) / f1 = 2.73; where R3 is the radius of curvature of the object-side surface S1 of first lens element L1 at the optical axis, R4 is the radius of curvature of the image-side surface S2 of first lens element L1 at the optical axis, and f1 is the effective focal length of first lens element L1. If the value of (R3 + R4) / f1 is too large, it will increase the difficulty of optical system 100 in correcting aberrations. If (R3 + R4) / f1 is too small, it will be difficult for optical system 100 to obtain object space light information, making it difficult to achieve optimal imaging effects.

[0160] Optical system 100 satisfies the relationship: R5 / R6 = 2.86; where R5 is the radius of curvature of the object-side surface S3 of second lens element L2 at the optical axis, and R6 is the radius of curvature of the image-side surface S4 of second lens element L2 at the optical axis. Second lens element L2 provides negative refractive power to balance the distortion produced by first lens element L1 and correct for aberrations introduced by first lens element L1.

[0161] Optical system 100 satisfies the relationship: |R7+R8| / |R7-R8|=13.81; where R7 is the radius of curvature of the object-side surface S5 of third lens element L3 at the optical axis, and R8 is the radius of curvature of the image-side surface S6 of third lens element L3 at the optical axis. When this relationship is satisfied, the radii of curvature of the object-side surface S5 and the image-side surface S6 of third lens element L3 are properly matched, allowing the incident angle to be reasonably increased to meet the image height requirements of optical system 100, while also reducing system sensitivity and improving assembly stability.

[0162] The optical system 100 satisfies the relationship: f1 / f2=-0.56, where f1 is the effective focal length of the first lens L1 and f2 is the effective focal length of the second lens L2. When the above relationship is satisfied, the positional chromatic aberration of the optical system 100 can be effectively corrected.

[0163] Optical system 100 satisfies the relationship: (R17*R18) / (R17-R18)=2.55; where R17 is the radius of curvature of the object-side surface S17 of eighth lens element L8 at the optical axis, and R18 is the radius of curvature of the image-side surface S16 of eighth lens element L8 at the optical axis. Both R17 and R18 are expressed in mm. When this relationship is satisfied, the radii of curvature of the object-side surface S15 and the image-side surface S16 of eighth lens element L8 are properly matched, effectively correcting spherical aberration, improving distortion and astigmatism, and reducing system sensitivity and enhancing assembly stability.

[0164] Optical system 100 satisfies the relationship: ΣCT / f = 0.74, where ΣCT is the sum of the center thicknesses of the lenses in optical system 100, and f is the effective focal length of optical system 100. When this relationship is satisfied, optical system 100 has a more compact structure and an effective focal length that is compatible with the structure, thereby enabling miniaturization.

[0165] Optical system 100 satisfies the relationship: ΣCT / TTL = 0.59, where ΣCT is the sum of the central thicknesses of the lenses in optical system 100, and TTL is the distance along the optical axis from the object-side surface S1 of first lens element L1 to the imaging surface S19 of optical system 100. Satisfying this relationship ensures excellent assembly stability, facilitating miniaturization.

[0166] Optical system 100 satisfies the relationship: ET1 / CT1 = 0.265; where ET1 is the edge thickness of first lens L1 (the thickness of first lens L1 at its maximum effective radius), and CT1 is the center thickness of first lens L1. All optical information acquired by optical system 100 must pass through first lens L1, and corresponding aberrations, distortion, and field curvature are also generated by first lens L1. Therefore, the ratio between the edge thickness and the center thickness of first lens L1 should not be too large. A too large ratio will make subsequent aberration correction difficult and result in significant distortion and field curvature, failing to meet optical performance requirements. When this relationship is satisfied, a well-balanced optical system 100 is achieved, achieving balanced aberrations, distortion, and field curvature, meeting high-quality photography requirements.

[0167] Optical system 100 satisfies the relationship: ET8 / CT8 = 0.86; where ET8 is the edge thickness of eighth lens element L8 (the thickness of eighth lens element L8 at its maximum effective radius), and CT8 is the center thickness of eighth lens element L8. Eighth lens element L8 is a key component for final correction of aberrations in optical system 100 and is relatively difficult to manufacture. Therefore, the ratio of edge thickness to center thickness should not be too large. Satisfying this relationship ensures that eighth lens L8 exhibits excellent optical performance and a high manufacturing yield.

[0168] In addition, various parameters of optical system 100 are given in Tables 1 and 2. The components of optical system 100, from the object plane (object side) to the imaging plane S19 (the image plane in Table 1), are arranged sequentially in the order of the components in Table 1 from top to bottom. Surface numbers 3 and 4 in Table 1 represent the object-side surface S1 and image-side surface S2 of first lens L1, respectively. That is, within the same lens, the surface with the smaller surface number is the object-side surface, and the surface with the larger surface number is the image-side surface. The Y radius is the paraxial radius of curvature of the object-side or image-side surface of the corresponding surface number. The first value in the "Thickness" parameter column for first lens L1 represents the thickness of the lens on the optical axis, and the second value represents the distance from the image-side surface of the lens to the object-side surface of the subsequent lens on the optical axis. The value corresponding to surface number 20 in the "Thickness" parameter for infrared cutoff filter L9 represents the distance from the image-side surface S18 of infrared cutoff filter L9 to the imaging plane S19. In Table 2, K is the cone constant, and Ai is the coefficient corresponding to the i-th higher-order term in the aspheric surface formula. Generally, the image surface in Table 1 is the photosensitive surface of the photosensitive element.

[0169] In addition, the refractive index and focal length of each lens are values ​​at the reference wavelength. The calculation of the relationship is based on the lens parameters (such as the data in Table 1) and the surface parameters (such as the data in Table 2).

[0170] In the first embodiment, the optical system 100 has an effective focal length f=4.74 mm, an aperture number FNO=1.397, a maximum field of view (diagonal viewing angle) FOV=80.39 degrees, a distance TTL on the optical axis from the object-side surface S1 of the first lens L1 to the imaging surface S19=5.9 mm, and half the diagonal length of the effective pixel area on the imaging surface Imgh=4.0 mm.

[0171] Table 1

[0172]

[0173] Table 2

[0174]

[0175]

[0176] Second embodiment

[0177] refer to Figure 3 In the second embodiment, the optical system 100 includes, from the object side to the image side, an aperture stop STO, a first lens element L1 having positive refractive power, a second lens element L2 having negative refractive power, a third lens element L3 having positive refractive power, a fourth lens element L4 having positive refractive power, a fifth lens element L5 having positive refractive power, a sixth lens element L6 having positive refractive power, a seventh lens element L7 having negative refractive power, and an eighth lens element L8 having negative refractive power. Figure 4It includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 100 in the second embodiment, wherein the astigmatism diagram and the distortion diagram are data diagrams at a reference wavelength, and the reference wavelength is 555 nm.

[0178] The object-side surface S1 of the first lens L1 is convex at the paraxial position, and the image-side surface S2 of the first lens L1 is concave at the paraxial position; the object-side surface S1 of the first lens L1 is convex at the circumference, and the image-side surface S2 of the first lens L1 is convex at the circumference.

[0179] The object-side surface S3 of the second lens L2 is convex at the paraxial position, and the image-side surface S4 of the second lens L2 is concave at the paraxial position; the object-side surface S3 of the second lens L2 is convex at the circumference, and the image-side surface S4 of the second lens L2 is concave at the circumference.

[0180] The object-side surface S5 of the third lens L3 is convex at the paraxial position, and the image-side surface S6 of the third lens L3 is concave at the paraxial position; the object-side surface S5 of the third lens L3 is concave at the circumference, and the image-side surface S6 of the third lens L3 is concave at the circumference.

[0181] The object-side surface S7 of the fourth lens L4 is convex at the paraxial position, and the image-side surface S8 of the fourth lens L4 is concave at the paraxial position; the object-side surface S7 of the fourth lens L4 is concave at the circumference, and the image-side surface S8 of the fourth lens L4 is convex at the circumference.

[0182] The object-side surface S9 of the fifth lens L5 is convex at the paraxial position, and the image-side surface S10 of the fifth lens L5 is concave at the paraxial position; the object-side surface S9 of the fifth lens L5 is concave at the circumference, and the image-side surface S10 of the fifth lens L5 is convex at the circumference.

[0183] The object-side surface S11 of the sixth lens L6 is convex at the paraxial position, and the image-side surface S12 of the sixth lens L6 is convex at the paraxial position; the object-side surface S11 of the sixth lens L6 is concave at the circumference, and the image-side surface S12 of the sixth lens L6 is convex at the circumference.

[0184] The object-side surface S13 of the seventh lens L7 is convex at the paraxial position, and the image-side surface S14 of the seventh lens L7 is concave at the paraxial position; the object-side surface S13 of the seventh lens L7 is concave at the circumference, and the image-side surface S14 of the seventh lens L7 is convex at the circumference.

[0185] The object-side surface S15 of the eighth lens L8 is convex at the paraxial position, and the image-side surface S16 of the eighth lens L8 is concave at the paraxial position; the object-side surface S15 of the eighth lens L8 is convex at the circumference, and the image-side surface S16 of the eighth lens L8 is convex at the circumference.

[0186] In the second embodiment, the optical system 100 has an effective focal length f=4.75 mm, an aperture number FNO=1.397, a maximum field of view (diagonal viewing angle) FOV=80.33 degrees, and a distance TTL on the optical axis from the object-side surface S1 of the first lens element L1 to the imaging surface S19=5.9 mm.

[0187] The parameters of the optical system 100 are given in Table 3 and Table 4, and the definitions of the parameters can be obtained from the first embodiment and are not repeated here.

[0188] Table 3

[0189]

[0190]

[0191] Table 4

[0192]

[0193] Based on the parameter information provided above, the following relationship can be deduced:

[0194]

[0195] Third embodiment

[0196] refer to Figure 5 In the third embodiment, the optical system 100 includes, from the object side to the image side, an aperture stop STO, a first lens element L1 with positive refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with negative refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with negative refractive power, a sixth lens element L6 with positive refractive power, a seventh lens element L7 with negative refractive power, and an eighth lens element L8 with negative refractive power. Figure 6 It includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 100 in the third embodiment, wherein the astigmatism diagram and the distortion diagram are data diagrams at a reference wavelength, and the reference wavelength is 555 nm.

[0197] The object-side surface S1 of the first lens L1 is convex at the paraxial position, and the image-side surface S2 of the first lens L1 is concave at the paraxial position; the object-side surface S1 of the first lens L1 is convex at the circumference, and the image-side surface S2 of the first lens L1 is convex at the circumference.

[0198] The object-side surface S3 of the second lens L2 is convex at the paraxial position, and the image-side surface S4 of the second lens L2 is concave at the paraxial position; the object-side surface S3 of the second lens L2 is convex at the circumference, and the image-side surface S4 of the second lens L2 is concave at the circumference.

[0199] The object-side surface S5 of the third lens L3 is convex at the paraxial position, and the image-side surface S6 of the third lens L3 is concave at the paraxial position; the object-side surface S5 of the third lens L3 is concave at the circumference, and the image-side surface S6 of the third lens L3 is concave at the circumference.

[0200] The object-side surface S7 of the fourth lens L4 is convex at the paraxial position, and the image-side surface S8 of the fourth lens L4 is concave at the paraxial position; the object-side surface S7 of the fourth lens L4 is concave at the circumference, and the image-side surface S8 of the fourth lens L4 is convex at the circumference.

[0201] The object-side surface S9 of the fifth lens L5 is convex at the paraxial position, and the image-side surface S10 of the fifth lens L5 is concave at the paraxial position; the object-side surface S9 of the fifth lens L5 is concave at the circumference, and the image-side surface S10 of the fifth lens L5 is convex at the circumference.

[0202] The object-side surface S11 of the sixth lens L6 is convex at the paraxial position, and the image-side surface S12 of the sixth lens L6 is convex at the paraxial position; the object-side surface S11 of the sixth lens L6 is concave at the circumference, and the image-side surface S12 of the sixth lens L6 is convex at the circumference.

[0203] The object-side surface S13 of the seventh lens L7 is convex at the paraxial position, and the image-side surface S14 of the seventh lens L7 is concave at the paraxial position; the object-side surface S13 of the seventh lens L7 is concave at the circumference, and the image-side surface S14 of the seventh lens L7 is convex at the circumference.

[0204] The object-side surface S15 of the eighth lens L8 is convex at the paraxial position, and the image-side surface S16 of the eighth lens L8 is concave at the paraxial position; the object-side surface S15 of the eighth lens L8 is convex at the circumference, and the image-side surface S16 of the eighth lens L8 is convex at the circumference.

[0205] In the third embodiment, the optical system 100 has an effective focal length f=4.76 mm, an aperture number FNO=1.397, a maximum field of view (diagonal viewing angle) FOV=80.40 degrees, and a distance TTL on the optical axis from the object-side surface S1 of the first lens element L1 to the imaging surface S19=5.9 mm.

[0206] The parameters of the optical system 100 are given in Table 5 and Table 6, and the definitions of the parameters can be obtained from the first embodiment and are not repeated here.

[0207] Table 5

[0208]

[0209]

[0210] Table 6

[0211]

[0212]

[0213] Based on the parameter information provided above, the following relationship can be deduced:

[0214]

[0215] Fourth embodiment

[0216] refer to Figure 7 In the fourth embodiment, the optical system 100 includes, from the object side to the image side, an aperture stop STO, a first lens element L1 with positive refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with negative refractive power, a sixth lens element L6 with positive refractive power, a seventh lens element L7 with negative refractive power, and an eighth lens element L8 with negative refractive power. Figure 8 It includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 100 in the fourth embodiment, wherein the astigmatism diagram and the distortion diagram are data diagrams at a reference wavelength, and the reference wavelength is 555 nm.

[0217] The object-side surface S1 of the first lens L1 is convex at the paraxial position, and the image-side surface S2 of the first lens L1 is concave at the paraxial position; the object-side surface S1 of the first lens L1 is convex at the circumference, and the image-side surface S2 of the first lens L1 is concave at the circumference.

[0218] The object-side surface S3 of the second lens L2 is convex at the paraxial position, and the image-side surface S4 of the second lens L2 is concave at the paraxial position; the object-side surface S3 of the second lens L2 is convex at the circumference, and the image-side surface S4 of the second lens L2 is concave at the circumference.

[0219] The object-side surface S5 of the third lens L3 is convex at the paraxial position, and the image-side surface S6 of the third lens L3 is concave at the paraxial position; the object-side surface S5 of the third lens L3 is convex at the circumference, and the image-side surface S6 of the third lens L3 is concave at the circumference.

[0220] The object-side surface S7 of the fourth lens L4 is concave at the paraxial position, and the image-side surface S8 of the fourth lens L4 is convex at the paraxial position; the object-side surface S7 of the fourth lens L4 is concave at the circumference, and the image-side surface S8 of the fourth lens L4 is convex at the circumference.

[0221] The object-side surface S9 of the fifth lens L5 is convex at the paraxial position, and the image-side surface S10 of the fifth lens L5 is concave at the paraxial position; the object-side surface S9 of the fifth lens L5 is concave at the circumference, and the image-side surface S10 of the fifth lens L5 is convex at the circumference.

[0222] The object-side surface S11 of the sixth lens L6 is concave at the paraxial position, and the image-side surface S12 of the sixth lens L6 is convex at the paraxial position; the object-side surface S11 of the sixth lens L6 is concave at the circumference, and the image-side surface S12 of the sixth lens L6 is convex at the circumference.

[0223] The object-side surface S13 of the seventh lens L7 is convex at the paraxial position, and the image-side surface S14 of the seventh lens L7 is concave at the paraxial position; the object-side surface S13 of the seventh lens L7 is concave at the circumference, and the image-side surface S14 of the seventh lens L7 is convex at the circumference.

[0224] The object-side surface S15 of the eighth lens L8 is convex at the paraxial position, and the image-side surface S16 of the eighth lens L8 is concave at the paraxial position; the object-side surface S15 of the eighth lens L8 is convex at the circumference, and the image-side surface S16 of the eighth lens L8 is convex at the circumference.

[0225] In the fourth embodiment, the optical system 100 has an effective focal length f=4.79 mm, an aperture number FNO=1.481, a maximum field of view (diagonal viewing angle) FOV=79.84 degrees, and a distance TTL on the optical axis from the object-side surface S1 of the first lens element L1 to the imaging surface S19=5.9 mm.

[0226] The parameters of the optical system 100 are given in Table 7 and Table 8, and the definitions of the parameters can be obtained from the first embodiment and are not repeated here.

[0227] Table 7

[0228]

[0229]

[0230] Table 8

[0231]

[0232]

[0233] Based on the parameter information provided above, the following relationship can be deduced:

[0234]

[0235] Fifth embodiment

[0236] refer to Figure 9In the fifth embodiment, the optical system 100 includes, from the object side to the image side, an aperture stop STO, a first lens element L1 with positive refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with negative refractive power, a sixth lens element L6 with positive refractive power, a seventh lens element L7 with negative refractive power, and an eighth lens element L8 with negative refractive power. Figure 10 It includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm) and a distortion diagram (%) of the optical system 100 in the fifth embodiment, wherein the astigmatism diagram and the distortion diagram are data diagrams at a reference wavelength, and the reference wavelength is 555 nm.

[0237] The object-side surface S1 of the first lens L1 is convex at the paraxial position, and the image-side surface S2 of the first lens L1 is concave at the paraxial position; the object-side surface S1 of the first lens L1 is convex at the circumference, and the image-side surface S2 of the first lens L1 is concave at the circumference.

[0238] The object-side surface S3 of the second lens L2 is convex at the paraxial position, and the image-side surface S4 of the second lens L2 is concave at the paraxial position; the object-side surface S3 of the second lens L2 is convex at the circumference, and the image-side surface S4 of the second lens L2 is concave at the circumference.

[0239] The object-side surface S5 of the third lens L3 is convex at the paraxial position, and the image-side surface S6 of the third lens L3 is concave at the paraxial position; the object-side surface S5 of the third lens L3 is convex at the circumference, and the image-side surface S6 of the third lens L3 is concave at the circumference.

[0240] The object-side surface S7 of the fourth lens L4 is convex at the paraxial position, and the image-side surface S8 of the fourth lens L4 is convex at the paraxial position; the object-side surface S7 of the fourth lens L4 is concave at the circumference, and the image-side surface S8 of the fourth lens L4 is convex at the circumference.

[0241] The object-side surface S9 of the fifth lens L5 is convex at the paraxial position, and the image-side surface S10 of the fifth lens L5 is concave at the paraxial position; the object-side surface S9 of the fifth lens L5 is concave at the circumference, and the image-side surface S10 of the fifth lens L5 is convex at the circumference.

[0242] The object-side surface S11 of the sixth lens L6 is convex at the paraxial position, and the image-side surface S12 of the sixth lens L6 is convex at the paraxial position; the object-side surface S11 of the sixth lens L6 is concave at the circumference, and the image-side surface S12 of the sixth lens L6 is convex at the circumference.

[0243] The object-side surface S13 of the seventh lens L7 is convex at the paraxial position, and the image-side surface S14 of the seventh lens L7 is concave at the paraxial position; the object-side surface S13 of the seventh lens L7 is concave at the circumference, and the image-side surface S14 of the seventh lens L7 is convex at the circumference.

[0244] The object-side surface S15 of the eighth lens L8 is convex at the paraxial position, and the image-side surface S16 of the eighth lens L8 is concave at the paraxial position; the object-side surface S15 of the eighth lens L8 is convex at the circumference, and the image-side surface S16 of the eighth lens L8 is convex at the circumference.

[0245] In the fifth embodiment, the optical system 100 has an effective focal length f=4.78 mm, an aperture number FNO=1.481, a maximum field of view (diagonal viewing angle) FOV=79.95 degrees, and a distance TTL on the optical axis from the object-side surface S1 of the first lens element L1 to the imaging surface S19=5.9 mm.

[0246] The parameters of the optical system 100 are given in Table 9 and Table 10, and the definitions of the parameters can be obtained from the first embodiment and are not repeated here.

[0247] Table 9

[0248]

[0249] Table 10

[0250]

[0251]

[0252] Based on the parameter information provided above, the following relationship can be deduced:

[0253]

[0254] Sixth embodiment

[0255] refer to Figure 11 In the sixth embodiment, the optical system 100 includes, from the object side to the image side, an aperture stop STO, a first lens element L1 with positive refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with negative refractive power, a fifth lens element L5 with positive refractive power, a sixth lens element L6 with positive refractive power, a seventh lens element L7 with negative refractive power, and an eighth lens element L8 with negative refractive power. Figure 12 It includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 100 in the sixth embodiment, wherein the astigmatism diagram and the distortion diagram are data diagrams at a reference wavelength, and the reference wavelength is 555 nm.

[0256] The object-side surface S1 of the first lens L1 is convex at the paraxial position, and the image-side surface S2 of the first lens L1 is concave at the paraxial position; the object-side surface S1 of the first lens L1 is convex at the circumference, and the image-side surface S2 of the first lens L1 is convex at the circumference.

[0257] The object-side surface S3 of the second lens L2 is convex at the paraxial position, and the image-side surface S4 of the second lens L2 is concave at the paraxial position; the object-side surface S3 of the second lens L2 is convex at the circumference, and the image-side surface S4 of the second lens L2 is concave at the circumference.

[0258] The object-side surface S5 of the third lens L3 is convex at the paraxial position, and the image-side surface S6 of the third lens L3 is concave at the paraxial position; the object-side surface S5 of the third lens L3 is concave at the circumference, and the image-side surface S6 of the third lens L3 is concave at the circumference.

[0259] The object-side surface S7 of the fourth lens L4 is convex at the paraxial position, and the image-side surface S8 of the fourth lens L4 is concave at the paraxial position; the object-side surface S7 of the fourth lens L4 is concave at the circumference, and the image-side surface S8 of the fourth lens L4 is convex at the circumference.

[0260] The object-side surface S9 of the fifth lens L5 is convex at the paraxial position, and the image-side surface S10 of the fifth lens L5 is concave at the paraxial position; the object-side surface S9 of the fifth lens L5 is concave at the circumference, and the image-side surface S10 of the fifth lens L5 is convex at the circumference.

[0261] The object-side surface S11 of the sixth lens L6 is convex at the paraxial position, and the image-side surface S12 of the sixth lens L6 is convex at the paraxial position; the object-side surface S11 of the sixth lens L6 is concave at the circumference, and the image-side surface S12 of the sixth lens L6 is convex at the circumference.

[0262] The object-side surface S13 of the seventh lens L7 is convex at the paraxial position, and the image-side surface S14 of the seventh lens L7 is concave at the paraxial position; the object-side surface S13 of the seventh lens L7 is concave at the circumference, and the image-side surface S14 of the seventh lens L7 is convex at the circumference.

[0263] The object-side surface S15 of the eighth lens L8 is convex at the paraxial position, and the image-side surface S16 of the eighth lens L8 is concave at the paraxial position; the object-side surface S15 of the eighth lens L8 is convex at the circumference, and the image-side surface S16 of the eighth lens L8 is convex at the circumference.

[0264] In the sixth embodiment, the optical system 100 has an effective focal length f=4.88 mm, an aperture number FNO=1.397, a maximum field of view (diagonal viewing angle) FOV=78.21 degrees, and a distance TTL on the optical axis from the object-side surface S1 of the first lens element L1 to the imaging surface S19=6.07 mm.

[0265] The parameters of the optical system 100 are given in Table 11 and Table 12, and the definitions of the parameters can be obtained from the first embodiment and are not repeated here.

[0266] Table 11

[0267]

[0268] Table 12

[0269]

[0270]

[0271] Based on the parameter information provided above, the following relationship can be deduced:

[0272]

[0273] Seventh embodiment

[0274] refer to Figure 13 In the seventh embodiment, the optical system 100 includes, from the object side to the image side, an aperture stop STO, a first lens element L1 with positive refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with negative refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with positive refractive power, a sixth lens element L6 with positive refractive power, a seventh lens element L7 with positive refractive power, and an eighth lens element L8 with negative refractive power. Figure 14 It includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm) and a distortion diagram (%) of the optical system 100 in the seventh embodiment, wherein the astigmatism diagram and the distortion diagram are data diagrams at a reference wavelength, and the reference wavelength is 555 nm.

[0275] The object-side surface S1 of the first lens L1 is convex at the paraxial position, and the image-side surface S2 of the first lens L1 is concave at the paraxial position; the object-side surface S1 of the first lens L1 is convex at the circumference, and the image-side surface S2 of the first lens L1 is concave at the circumference.

[0276] The object-side surface S3 of the second lens L2 is convex at the paraxial position, and the image-side surface S4 of the second lens L2 is concave at the paraxial position; the object-side surface S3 of the second lens L2 is convex at the circumference, and the image-side surface S4 of the second lens L2 is concave at the circumference.

[0277] The object-side surface S5 of the third lens L3 is convex at the paraxial position, and the image-side surface S6 of the third lens L3 is concave at the paraxial position; the object-side surface S5 of the third lens L3 is concave at the circumference, and the image-side surface S6 of the third lens L3 is concave at the circumference.

[0278] The object-side surface S7 of the fourth lens L4 is convex at the paraxial position, and the image-side surface S8 of the fourth lens L4 is convex at the paraxial position; the object-side surface S7 of the fourth lens L4 is concave at the circumference, and the image-side surface S8 of the fourth lens L4 is convex at the circumference.

[0279] The object-side surface S9 of the fifth lens L5 is convex at the paraxial position, and the image-side surface S10 of the fifth lens L5 is concave at the paraxial position; the object-side surface S9 of the fifth lens L5 is concave at the circumference, and the image-side surface S10 of the fifth lens L5 is convex at the circumference.

[0280] The object-side surface S11 of the sixth lens L6 is concave at the paraxial position, and the image-side surface S12 of the sixth lens L6 is convex at the paraxial position; the object-side surface S11 of the sixth lens L6 is concave at the circumference, and the image-side surface S12 of the sixth lens L6 is convex at the circumference.

[0281] The object-side surface S13 of the seventh lens L7 is convex at the paraxial position, and the image-side surface S14 of the seventh lens L7 is concave at the paraxial position; the object-side surface S13 of the seventh lens L7 is concave at the circumference, and the image-side surface S14 of the seventh lens L7 is convex at the circumference.

[0282] The object-side surface S15 of the eighth lens L8 is concave at the paraxial position, and the image-side surface S16 of the eighth lens L8 is concave at the paraxial position; the object-side surface S15 of the eighth lens L8 is convex at the circumference, and the image-side surface S16 of the eighth lens L8 is convex at the circumference.

[0283] In the seventh embodiment, the optical system 100 has an effective focal length f=4.79 mm, an aperture number FNO=1.397, a maximum field of view (diagonal viewing angle) FOV=80 degrees, and a distance TTL on the optical axis from the object-side surface S1 of the first lens element L1 to the imaging surface S19=5.9 mm.

[0284] The parameters of the optical system 100 are given in Table 13 and Table 14, and the definitions of the parameters can be obtained from the first embodiment and are not repeated here.

[0285] Table 13

[0286]

[0287] Table 14

[0288]

[0289]

[0290] Based on the parameter information provided above, the following relationship can be deduced:

[0291]

[0292] Eighth embodiment

[0293] refer to Figure 15In the eighth embodiment, the optical system 100 includes, from the object side to the image side, an aperture stop STO, a first lens element L1 with positive refractive power, a second lens element L2 with positive refractive power, a third lens element L3 with negative refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with positive refractive power, a sixth lens element L6 with positive refractive power, a seventh lens element L7 with negative refractive power, and an eighth lens element L8 with negative refractive power. Figure 16 It includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm) and a distortion diagram (%) of the optical system 100 in the eighth embodiment, wherein the astigmatism diagram and the distortion diagram are data diagrams at a reference wavelength, and the reference wavelength is 555 nm.

[0294] The object-side surface S1 of the first lens L1 is convex at the paraxial position, and the image-side surface S2 of the first lens L1 is concave at the paraxial position; the object-side surface S1 of the first lens L1 is convex at the circumference, and the image-side surface S2 of the first lens L1 is concave at the circumference.

[0295] The object-side surface S3 of the second lens L2 is convex at the paraxial position, and the image-side surface S4 of the second lens L2 is concave at the paraxial position; the object-side surface S3 of the second lens L2 is convex at the circumference, and the image-side surface S4 of the second lens L2 is concave at the circumference.

[0296] The object-side surface S5 of the third lens L3 is convex at the paraxial position, and the image-side surface S6 of the third lens L3 is concave at the paraxial position; the object-side surface S5 of the third lens L3 is concave at the circumference, and the image-side surface S6 of the third lens L3 is concave at the circumference.

[0297] The object-side surface S7 of the fourth lens L4 is convex at the paraxial position, and the image-side surface S8 of the fourth lens L4 is convex at the paraxial position; the object-side surface S7 of the fourth lens L4 is concave at the circumference, and the image-side surface S8 of the fourth lens L4 is convex at the circumference.

[0298] The object-side surface S9 of the fifth lens L5 is convex at the paraxial position, and the image-side surface S10 of the fifth lens L5 is concave at the paraxial position; the object-side surface S9 of the fifth lens L5 is concave at the circumference, and the image-side surface S10 of the fifth lens L5 is convex at the circumference.

[0299] The object-side surface S11 of the sixth lens L6 is convex at the paraxial position, and the image-side surface S12 of the sixth lens L6 is convex at the paraxial position; the object-side surface S11 of the sixth lens L6 is concave at the circumference, and the image-side surface S12 of the sixth lens L6 is convex at the circumference.

[0300] The object-side surface S13 of the seventh lens L7 is convex at the paraxial position, and the image-side surface S14 of the seventh lens L7 is concave at the paraxial position; the object-side surface S13 of the seventh lens L7 is concave at the circumference, and the image-side surface S14 of the seventh lens L7 is convex at the circumference.

[0301] The object-side surface S15 of the eighth lens L8 is concave at the paraxial position, and the image-side surface S16 of the eighth lens L8 is concave at the paraxial position; the object-side surface S15 of the eighth lens L8 is concave at the circumference, and the image-side surface S16 of the eighth lens L8 is convex at the circumference.

[0302] In the eighth embodiment, the optical system 100 has an effective focal length f=4.81 mm, an aperture number FNO=1.6, a maximum field of view (diagonal viewing angle) FOV=80 degrees, and a distance TTL on the optical axis from the object-side surface S1 of the first lens element L1 to the imaging surface S19=5.92 mm.

[0303] The parameters of the optical system 100 are given in Table 15 and Table 16, and the definitions of the parameters can be obtained from the first embodiment and are not repeated here.

[0304] Table 15

[0305]

[0306] Table 16

[0307]

[0308]

[0309] Based on the parameter information provided above, the following relationship can be deduced:

[0310]

[0311] Ninth embodiment

[0312] refer to Figure 17 In the ninth embodiment, the optical system 100 includes, from the object side to the image side, an aperture stop STO, a first lens element L1 with positive refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with negative refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with positive refractive power, a sixth lens element L6 with positive refractive power, a seventh lens element L7 with positive refractive power, and an eighth lens element L8 with negative refractive power. Figure 18 It includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm) and a distortion diagram (%) of the optical system 100 in the ninth embodiment, wherein the astigmatism diagram and the distortion diagram are data diagrams at a reference wavelength, and the reference wavelength is 555 nm.

[0313] The object-side surface S1 of the first lens L1 is convex at the paraxial position, and the image-side surface S2 of the first lens L1 is concave at the paraxial position; the object-side surface S1 of the first lens L1 is convex at the circumference, and the image-side surface S2 of the first lens L1 is concave at the circumference.

[0314] The object-side surface S3 of the second lens L2 is convex at the paraxial position, and the image-side surface S4 of the second lens L2 is concave at the paraxial position; the object-side surface S3 of the second lens L2 is convex at the circumference, and the image-side surface S4 of the second lens L2 is concave at the circumference.

[0315] The object-side surface S5 of the third lens L3 is convex at the paraxial position, and the image-side surface S6 of the third lens L3 is concave at the paraxial position; the object-side surface S5 of the third lens L3 is concave at the circumference, and the image-side surface S6 of the third lens L3 is concave at the circumference.

[0316] The object-side surface S7 of the fourth lens L4 is convex at the paraxial position, and the image-side surface S8 of the fourth lens L4 is convex at the paraxial position; the object-side surface S7 of the fourth lens L4 is concave at the circumference, and the image-side surface S8 of the fourth lens L4 is convex at the circumference.

[0317] The object-side surface S9 of the fifth lens L5 is convex at the paraxial position, and the image-side surface S10 of the fifth lens L5 is concave at the paraxial position; the object-side surface S9 of the fifth lens L5 is concave at the circumference, and the image-side surface S10 of the fifth lens L5 is concave at the circumference.

[0318] The object-side surface S11 of the sixth lens L6 is concave at the paraxial position, and the image-side surface S12 of the sixth lens L6 is convex at the paraxial position; the object-side surface S11 of the sixth lens L6 is concave at the circumference, and the image-side surface S12 of the sixth lens L6 is convex at the circumference.

[0319] The object-side surface S13 of the seventh lens L7 is convex at the paraxial position, and the image-side surface S14 of the seventh lens L7 is concave at the paraxial position; the object-side surface S13 of the seventh lens L7 is concave at the circumference, and the image-side surface S14 of the seventh lens L7 is convex at the circumference.

[0320] The object-side surface S15 of the eighth lens L8 is concave at the paraxial position, and the image-side surface S16 of the eighth lens L8 is concave at the paraxial position; the object-side surface S15 of the eighth lens L8 is concave at the circumference, and the image-side surface S16 of the eighth lens L8 is convex at the circumference.

[0321] In the ninth embodiment, the optical system 100 has an effective focal length f=4.9 mm, an aperture number FNO=1.8, a maximum field of view (diagonal viewing angle) FOV=78.66 degrees, and a distance TTL on the optical axis from the object-side surface S1 of the first lens element L1 to the imaging surface S19=5.9 mm.

[0322] The parameters of the optical system 100 are given in Table 17 and Table 18, and the definitions of the parameters can be obtained from the first embodiment and are not repeated here.

[0323] Table 17

[0324]

[0325] Table 18

[0326]

[0327]

[0328] Based on the parameter information provided above, the following relationship can be deduced:

[0329]

[0330] Tenth embodiment

[0331] refer to Figure 19 In the tenth embodiment, the optical system 100 includes, from the object side to the image side, an aperture stop STO, a first lens element L1 with positive refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with negative refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with positive refractive power, a sixth lens element L6 with positive refractive power, a seventh lens element L7 with positive refractive power, and an eighth lens element L8 with negative refractive power. Figure 20 It includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm) and a distortion diagram (%) of the optical system 100 in the tenth embodiment, wherein the astigmatism diagram and the distortion diagram are data diagrams at a reference wavelength, and the reference wavelength is 555 nm.

[0332] The object-side surface S1 of the first lens L1 is convex at the paraxial position, and the image-side surface S2 of the first lens L1 is concave at the paraxial position; the object-side surface S1 of the first lens L1 is convex at the circumference, and the image-side surface S2 of the first lens L1 is concave at the circumference.

[0333] The object-side surface S3 of the second lens L2 is convex at the paraxial position, and the image-side surface S4 of the second lens L2 is concave at the paraxial position; the object-side surface S3 of the second lens L2 is convex at the circumference, and the image-side surface S4 of the second lens L2 is concave at the circumference.

[0334] The object-side surface S5 of the third lens L3 is convex at the paraxial position, and the image-side surface S6 of the third lens L3 is concave at the paraxial position; the object-side surface S5 of the third lens L3 is concave at the circumference, and the image-side surface S6 of the third lens L3 is concave at the circumference.

[0335] The object-side surface S7 of the fourth lens L4 is convex at the paraxial position, and the image-side surface S8 of the fourth lens L4 is convex at the paraxial position; the object-side surface S7 of the fourth lens L4 is concave at the circumference, and the image-side surface S8 of the fourth lens L4 is convex at the circumference.

[0336] The object-side surface S9 of the fifth lens L5 is convex at the paraxial position, and the image-side surface S10 of the fifth lens L5 is concave at the paraxial position; the object-side surface S9 of the fifth lens L5 is concave at the circumference, and the image-side surface S10 of the fifth lens L5 is concave at the circumference.

[0337] The object-side surface S11 of the sixth lens L6 is concave at the paraxial position, and the image-side surface S12 of the sixth lens L6 is convex at the paraxial position; the object-side surface S11 of the sixth lens L6 is concave at the circumference, and the image-side surface S12 of the sixth lens L6 is convex at the circumference.

[0338] The object-side surface S13 of the seventh lens L7 is convex at the paraxial position, and the image-side surface S14 of the seventh lens L7 is concave at the paraxial position; the object-side surface S13 of the seventh lens L7 is concave at the circumference, and the image-side surface S14 of the seventh lens L7 is convex at the circumference.

[0339] The object-side surface S15 of the eighth lens L8 is concave at the paraxial position, and the image-side surface S16 of the eighth lens L8 is concave at the paraxial position; the object-side surface S15 of the eighth lens L8 is convex at the circumference, and the image-side surface S16 of the eighth lens L8 is convex at the circumference.

[0340] In the tenth embodiment, the optical system 100 has an effective focal length f=4.79 mm, an aperture number FNO=1.55, a maximum field of view (diagonal viewing angle) FOV=80 degrees, and a distance TTL on the optical axis from the object-side surface S1 of the first lens element L1 to the imaging surface S19=5.9 mm.

[0341] The parameters of the optical system 100 are given in Table 19 and Table 20, and the definitions of the parameters can be obtained from the first embodiment and are not repeated here.

[0342] Table 19

[0343]

[0344] Table 20

[0345]

[0346]

[0347] Based on the parameter information provided above, the following relationship can be deduced:

[0348]

[0349] Eleventh embodiment

[0350] refer to Figure 21In the eleventh embodiment, the optical system 100 includes, from the object side to the image side, an aperture stop STO, a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, a third lens L3 with negative refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with positive refractive power, a sixth lens L6 with positive refractive power, a seventh lens L7 with positive refractive power, and an eighth lens L8 with negative refractive power. Figure 22 It includes the longitudinal spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of the optical system 100 in the eleventh embodiment, wherein the astigmatism diagram and distortion diagram are data diagrams at a reference wavelength, and the reference wavelength is 555nm.

[0351] The object-side surface S1 of the first lens L1 is convex at the paraxial position, and the image-side surface S2 of the first lens L1 is concave at the paraxial position; the object-side surface S1 of the first lens L1 is convex at the circumference, and the image-side surface S2 of the first lens L1 is concave at the circumference.

[0352] The object-side surface S3 of the second lens L2 is convex at the paraxial position, and the image-side surface S4 of the second lens L2 is concave at the paraxial position; the object-side surface S3 of the second lens L2 is convex at the circumference, and the image-side surface S4 of the second lens L2 is concave at the circumference.

[0353] The object-side surface S5 of the third lens L3 is convex at the paraxial position, and the image-side surface S6 of the third lens L3 is concave at the paraxial position; the object-side surface S5 of the third lens L3 is concave at the circumference, and the image-side surface S6 of the third lens L3 is concave at the circumference.

[0354] The object-side surface S7 of the fourth lens L4 is convex at the paraxial position, and the image-side surface S8 of the fourth lens L4 is convex at the paraxial position; the object-side surface S7 of the fourth lens L4 is concave at the circumference, and the image-side surface S8 of the fourth lens L4 is convex at the circumference.

[0355] The object-side surface S9 of the fifth lens L5 is convex at the paraxial position, and the image-side surface S10 of the fifth lens L5 is concave at the paraxial position; the object-side surface S9 of the fifth lens L5 is concave at the circumference, and the image-side surface S10 of the fifth lens L5 is convex at the circumference.

[0356] The object-side surface S11 of the sixth lens L6 is concave at the paraxial position, and the image-side surface S12 of the sixth lens L6 is convex at the paraxial position; the object-side surface S11 of the sixth lens L6 is concave at the circumference, and the image-side surface S12 of the sixth lens L6 is convex at the circumference.

[0357] The object-side surface S13 of the seventh lens L7 is convex at the paraxial position, and the image-side surface S14 of the seventh lens L7 is concave at the paraxial position; the object-side surface S13 of the seventh lens L7 is concave at the circumference, and the image-side surface S14 of the seventh lens L7 is convex at the circumference.

[0358] The object-side surface S15 of the eighth lens L8 is concave at the paraxial position, and the image-side surface S16 of the eighth lens L8 is concave at the paraxial position; the object-side surface S15 of the eighth lens L8 is concave at the circumference, and the image-side surface S16 of the eighth lens L8 is convex at the circumference.

[0359] In the eleventh embodiment, the optical system 100 has an effective focal length f=4.79 mm, an aperture number FNO=1.65, a maximum field of view (diagonal viewing angle) FOV=80 degrees, and a distance TTL on the optical axis from the object-side surface S1 of the first lens element L1 to the imaging surface S19=5.9 mm.

[0360] The parameters of the optical system 100 are given in Table 21 and Table 22, and the definitions of the parameters can be obtained from the first embodiment and will not be repeated here.

[0361] Table 21

[0362]

[0363] Table 22

[0364]

[0365] Based on the parameter information provided above, the following relationship can be deduced:

[0366]

[0367] Twelfth embodiment

[0368] refer to Figure 23 In the twelfth embodiment, the optical system 100 includes, from the object side to the image side, an aperture stop STO, a first lens element L1 with positive refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with negative refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with positive refractive power, a sixth lens element L6 with positive refractive power, a seventh lens element L7 with negative refractive power, and an eighth lens element L8 with negative refractive power. Figure 24 It includes the longitudinal spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of the optical system 100 in the twelfth embodiment, wherein the astigmatism diagram and distortion diagram are data diagrams at a reference wavelength, and the reference wavelength is 555nm.

[0369] The object-side surface S1 of the first lens L1 is convex at the paraxial position, and the image-side surface S2 of the first lens L1 is concave at the paraxial position; the object-side surface S1 of the first lens L1 is convex at the circumference, and the image-side surface S2 of the first lens L1 is concave at the circumference.

[0370] The object-side surface S3 of the second lens L2 is convex at the paraxial position, and the image-side surface S4 of the second lens L2 is concave at the paraxial position; the object-side surface S3 of the second lens L2 is convex at the circumference, and the image-side surface S4 of the second lens L2 is concave at the circumference.

[0371] The object-side surface S5 of the third lens L3 is convex at the paraxial position, and the image-side surface S6 of the third lens L3 is concave at the paraxial position; the object-side surface S5 of the third lens L3 is concave at the circumference, and the image-side surface S6 of the third lens L3 is concave at the circumference.

[0372] The object-side surface S7 of the fourth lens L4 is convex at the paraxial position, and the image-side surface S8 of the fourth lens L4 is convex at the paraxial position; the object-side surface S7 of the fourth lens L4 is concave at the circumference, and the image-side surface S8 of the fourth lens L4 is convex at the circumference.

[0373] The object-side surface S9 of the fifth lens L5 is convex at the paraxial position, and the image-side surface S10 of the fifth lens L5 is concave at the paraxial position; the object-side surface S9 of the fifth lens L5 is concave at the circumference, and the image-side surface S10 of the fifth lens L5 is concave at the circumference.

[0374] The object-side surface S11 of the sixth lens L6 is concave at the paraxial position, and the image-side surface S12 of the sixth lens L6 is convex at the paraxial position; the object-side surface S11 of the sixth lens L6 is concave at the circumference, and the image-side surface S12 of the sixth lens L6 is convex at the circumference.

[0375] The object-side surface S13 of the seventh lens L7 is convex at the paraxial position, and the image-side surface S14 of the seventh lens L7 is concave at the paraxial position; the object-side surface S13 of the seventh lens L7 is concave at the circumference, and the image-side surface S14 of the seventh lens L7 is convex at the circumference.

[0376] The object-side surface S15 of the eighth lens L8 is concave at the paraxial position, and the image-side surface S16 of the eighth lens L8 is concave at the paraxial position; the object-side surface S15 of the eighth lens L8 is convex at the circumference, and the image-side surface S16 of the eighth lens L8 is convex at the circumference.

[0377] In the twelfth embodiment, the optical system 100 has an effective focal length f=4.83 mm, an aperture number FNO=1.88, a maximum field of view (diagonal viewing angle) FOV=79.5 degrees, and a distance TTL on the optical axis from the object-side surface S1 of the first lens element L1 to the imaging surface S19=5.9 mm.

[0378] The parameters of the optical system 100 are given in Table 23 and Table 24, and the definitions of the parameters can be derived from the first embodiment and will not be repeated here.

[0379] Table 23

[0380]

[0381]

[0382] Table 24

[0383]

[0384] Based on the parameter information provided above, the following relationship can be deduced:

[0385]

[0386] Thirteenth embodiment

[0387] refer to Figure 25 In the thirteenth embodiment, the optical system 100 includes, from the object side to the image side, an aperture stop STO, a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, a third lens L3 with negative refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with positive refractive power, a sixth lens L6 with positive refractive power, a seventh lens L7 with positive refractive power, and an eighth lens L8 with negative refractive power. Figure 26 It includes the longitudinal spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of the optical system 100 in the thirteenth embodiment, wherein the astigmatism diagram and distortion diagram are data diagrams at a reference wavelength, and the reference wavelength is 555nm.

[0388] The object-side surface S1 of the first lens L1 is convex at the paraxial position, and the image-side surface S2 of the first lens L1 is concave at the paraxial position; the object-side surface S1 of the first lens L1 is convex at the circumference, and the image-side surface S2 of the first lens L1 is concave at the circumference.

[0389] The object-side surface S3 of the second lens L2 is convex at the paraxial position, and the image-side surface S4 of the second lens L2 is concave at the paraxial position; the object-side surface S3 of the second lens L2 is convex at the circumference, and the image-side surface S4 of the second lens L2 is concave at the circumference.

[0390] The object-side surface S5 of the third lens L3 is convex at the paraxial position, and the image-side surface S6 of the third lens L3 is concave at the paraxial position; the object-side surface S5 of the third lens L3 is concave at the circumference, and the image-side surface S6 of the third lens L3 is concave at the circumference.

[0391] The object-side surface S7 of the fourth lens L4 is convex at the paraxial position, and the image-side surface S8 of the fourth lens L4 is convex at the paraxial position; the object-side surface S7 of the fourth lens L4 is concave at the circumference, and the image-side surface S8 of the fourth lens L4 is convex at the circumference.

[0392] The object-side surface S9 of the fifth lens L5 is convex at the paraxial position, and the image-side surface S10 of the fifth lens L5 is concave at the paraxial position; the object-side surface S9 of the fifth lens L5 is concave at the circumference, and the image-side surface S10 of the fifth lens L5 is concave at the circumference.

[0393] The object-side surface S11 of the sixth lens L6 is concave at the paraxial position, and the image-side surface S12 of the sixth lens L6 is convex at the paraxial position; the object-side surface S11 of the sixth lens L6 is concave at the circumference, and the image-side surface S12 of the sixth lens L6 is convex at the circumference.

[0394] The object-side surface S13 of the seventh lens L7 is convex at the paraxial position, and the image-side surface S14 of the seventh lens L7 is concave at the paraxial position; the object-side surface S13 of the seventh lens L7 is concave at the circumference, and the image-side surface S14 of the seventh lens L7 is convex at the circumference.

[0395] The object-side surface S15 of the eighth lens L8 is concave at the paraxial position, and the image-side surface S16 of the eighth lens L8 is concave at the paraxial position; the object-side surface S15 of the eighth lens L8 is concave at the circumference, and the image-side surface S16 of the eighth lens L8 is convex at the circumference.

[0396] In the thirteenth embodiment, the optical system 100 has an effective focal length f=4.8 mm, an aperture number FNO=1.88, a maximum field of view (diagonal viewing angle) FOV=79.8 degrees, and a distance TTL on the optical axis from the object-side surface S1 of the first lens element L1 to the imaging surface S19=5.9 mm.

[0397] The parameters of the optical system 100 are given in Table 25 and Table 26, and the definitions of the parameters can be derived from the first embodiment and will not be repeated here.

[0398] Table 25

[0399]

[0400]

[0401] Table 26

[0402]

[0403] Based on the parameter information provided above, the following relationship can be deduced:

[0404]

[0405] Fourteenth embodiment

[0406] refer to Figure 27In the fourteenth embodiment, the optical system 100 includes, from the object side to the image side, an aperture stop STO, a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, a third lens L3 with negative refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with positive refractive power, a sixth lens L6 with negative refractive power, a seventh lens L7 with positive refractive power, and an eighth lens L8 with negative refractive power. Figure 28 It includes the longitudinal spherical aberration diagram (mm), astigmatism diagram (mm) and distortion diagram (%) of the optical system 100 in the fourteenth embodiment, wherein the astigmatism diagram and distortion diagram are data diagrams at a reference wavelength, and the reference wavelength is 555nm.

[0407] The object-side surface S1 of the first lens L1 is convex at the paraxial position, and the image-side surface S2 of the first lens L1 is concave at the paraxial position; the object-side surface S1 of the first lens L1 is convex at the circumference, and the image-side surface S2 of the first lens L1 is concave at the circumference.

[0408] The object-side surface S3 of the second lens L2 is convex at the paraxial position, and the image-side surface S4 of the second lens L2 is concave at the paraxial position; the object-side surface S3 of the second lens L2 is convex at the circumference, and the image-side surface S4 of the second lens L2 is concave at the circumference.

[0409] The object-side surface S5 of the third lens L3 is convex at the paraxial position, and the image-side surface S6 of the third lens L3 is concave at the paraxial position; the object-side surface S5 of the third lens L3 is convex at the circumference, and the image-side surface S6 of the third lens L3 is concave at the circumference.

[0410] The object-side surface S7 of the fourth lens L4 is convex at the paraxial position, and the image-side surface S8 of the fourth lens L4 is convex at the paraxial position; the object-side surface S7 of the fourth lens L4 is concave at the circumference, and the image-side surface S8 of the fourth lens L4 is convex at the circumference.

[0411] The object-side surface S9 of the fifth lens L5 is convex at the paraxial position, and the image-side surface S10 of the fifth lens L5 is concave at the paraxial position; the object-side surface S9 of the fifth lens L5 is concave at the circumference, and the image-side surface S10 of the fifth lens L5 is concave at the circumference.

[0412] The object-side surface S11 of the sixth lens L6 is concave at the paraxial position, and the image-side surface S12 of the sixth lens L6 is convex at the paraxial position; the object-side surface S11 of the sixth lens L6 is concave at the circumference, and the image-side surface S12 of the sixth lens L6 is convex at the circumference.

[0413] The object-side surface S13 of the seventh lens L7 is convex at the paraxial position, and the image-side surface S14 of the seventh lens L7 is concave at the paraxial position; the object-side surface S13 of the seventh lens L7 is concave at the circumference, and the image-side surface S14 of the seventh lens L7 is convex at the circumference.

[0414] The object-side surface S15 of the eighth lens L8 is concave at the paraxial position, and the image-side surface S16 of the eighth lens L8 is concave at the paraxial position; the object-side surface S15 of the eighth lens L8 is concave at the circumference, and the image-side surface S16 of the eighth lens L8 is convex at the circumference.

[0415] In the fourteenth embodiment, the optical system 100 has an effective focal length f=4.85 mm, an aperture number FNO=1.8, a maximum field of view (diagonal viewing angle) FOV=79.2 degrees, and a distance TTL on the optical axis from the object-side surface S1 of the first lens element L1 to the imaging surface S19=5.9 mm.

[0416] The parameters of the optical system 100 are given in Table 27 and Table 28, and the definitions of the parameters can be derived from the first embodiment and will not be repeated here.

[0417] Table 27

[0418]

[0419]

[0420] Table 28

[0421]

[0422] Based on the parameter information provided above, the following relationship can be deduced:

[0423]

[0424] refer to Figure 29 In some embodiments, the image side of the optical system is equipped with a photosensitive element 210 to form the imaging module 200. The photosensitive element may be a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor). It should be noted that the imaging surface S19 in the above embodiments can be understood as the photosensitive surface of the photosensitive element 210.

[0425] In some embodiments, the photosensitive element 210 is relatively fixedly disposed on the image side of the optical system, and the imaging module 200 is a fixed-focus module. In other embodiments, a voice coil motor is configured to enable the photosensitive element 210 to move relative to the lenses in the optical system 100, thereby achieving a focusing function.

[0426] refer to Figure 30In some embodiments, the imaging module 200 can be applied to, but not limited to, electronic devices 30 such as smart phones, tablet computers, PDAs (Personal Digital Assistants), drones, and computers, so that users can obtain high-quality images in dark environments. The electronic device 30 includes any mobile terminal with camera capabilities, especially smart phones. When the imaging module 200 is a fixed-focus module, the imaging module 200 can be used as a front camera module of a smart phone; when the imaging module 200 has a focusing function, the imaging module 200 can also be used as a rear camera module of a smart phone. By using the imaging module 200 with the above-mentioned optical system, the electronic device will have the ability to obtain high-quality images in dark environments such as night scenes and starry skies.

[0427] 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.

[0428] 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: There are eight lenses with refractive power, including the following from object side to image side: a first lens having positive refractive power, wherein the object-side surface of the first lens is convex at the optical axis, the object-side surface of the first lens is convex at the circumference, and the image-side surface of the first lens is concave at the optical axis; a second lens having refractive power, wherein the object-side surface of the second lens is convex at the optical axis, and the image-side surface of the second lens is concave at the optical axis; a third lens having refractive power, wherein the object-side surface of the third lens is convex at the optical axis, and the image-side surface of the third lens is concave at the optical axis; a fourth lens having refractive power; a fifth lens having refractive power, wherein the object-side surface of the fifth lens is convex at the optical axis, and the image-side surface of the fifth lens is concave at the optical axis; a sixth lens having refractive power; a seventh lens having refractive power, wherein the object-side surface of the seventh lens is convex at the optical axis, and the image-side surface of the seventh lens is concave at the optical axis; an eighth lens element having negative refractive power, wherein the image-side surface of the eighth lens element is concave at the optical axis; The optical system satisfies the following relationship: 1.72≤TTL / L<2.5; 0.20<ET1 / CT1<0.60; Wherein, 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. The optical system also includes an aperture. L is the effective aperture diameter of the aperture. ET1 is the edge thickness of the first lens. CT1 is the center thickness of the first lens.

2. The optical system according to claim 1, wherein: The following relations are satisfied: f14＞0； f58＜0； Wherein, f14 is the combined focal length of the first lens, the second lens, the third lens and the fourth lens, and f58 is the combined focal length of the fifth lens, the sixth lens, the seventh lens and the eighth lens.

3. The optical system according to claim 2, wherein: The following relations are satisfied: -0.7<f14 / f58≤-0.

19.

4. The optical system according to claim 1, wherein: The following relations are satisfied: 0.2<Fno / TTL<0.35; Wherein, Fno is the aperture number of the optical system, TTL is the distance from the object side surface of the first lens to the imaging plane of the optical system on the optical axis, and the unit of TTL is mm.

5. The optical system according to claim 4, wherein: The following relations are satisfied: 1.397≤Fno≤1.

88.

6. The optical system according to claim 1, wherein: The following relationship is satisfied: TTL / Imgh<1.5; Wherein, TTL is the distance from the object side of the first lens to the imaging plane of the optical system on the optical axis, and Imgh is half of the diagonal length of the effective pixel area on the imaging plane.

7. The optical system according to claim 1, wherein: The following relationship is satisfied: 1.2≤TTL / |f|<1.5; Wherein, 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 f is the effective focal length of the optical system.

8. The optical system according to claim 1, wherein: The following relationship is satisfied: 0.69≤f / f1≤1.2; Wherein, f is the effective focal length of the optical system, and f1 is the effective focal length of the first lens.

9. The optical system according to claim 1, wherein: The following relationship is satisfied: -0.10<(R9+R10) / (R9*R10)<0.25; Wherein, R9 is the curvature radius of the object side surface of the fourth lens at the optical axis, and R10 is the curvature radius of the image side surface of the fourth lens at the optical axis. The units of R9 and R10 are both mm.

10. The optical system according to claim 1, wherein: The following relationship is satisfied: 0.87≤(R3+R4) / f1<3.5; Wherein, R3 is the curvature radius of the object side surface of the first lens at the optical axis, R4 is the curvature radius of the image side surface of the first lens at the optical axis, and f1 is the effective focal length of the first lens.

11. The optical system according to claim 1, wherein: The following relationship is satisfied: 0.8<R5 / R6≤2.89; Wherein, R5 is the curvature radius of the object side surface of the second lens at the optical axis, and R6 is the curvature radius of the image side surface of the second lens at the optical axis.

12. The optical system according to claim 1, wherein: The following relationship is satisfied: 8<|R7+R8| / |R7-R8|<48; Wherein, R7 is the curvature radius of the object side surface of the third lens at the optical axis, and R8 is the curvature radius of the image side surface of the third lens at the optical axis.

13. The optical system according to claim 1, wherein: The following relationship is satisfied: -0.6<f1 / f2<0.1; Wherein, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens.

14. The optical system according to claim 1, wherein: The following relationship is satisfied: 1.8<(R17*R18) / (R17-R18)<3; Wherein, R17 is the curvature radius of the object side surface of the eighth lens at the optical axis, and R18 is the curvature radius of the image side surface of the eighth lens at the optical axis. The units of R17 and R18 are both mm.

15. The optical system according to claim 1, wherein The following relationship is satisfied: 0.66≤ΣCT / f<0.8; Wherein, ΣCT is the sum of the center thicknesses of the lenses in the optical system, and f is the effective focal length of the optical system.

16. The optical system according to claim 1, wherein: The following relationship is satisfied: 0.55≤ΣCT / TTL<0.62; Wherein, ΣCT is the sum of the center thicknesses of the lenses in the optical system, and TTL is the distance from the object-side surface of the first lens to the imaging plane of the optical system on the optical axis.

17. The optical system according to claim 1, wherein: The following relationship is satisfied: 0.264≤ET1 / CT1<0.

60.

18. The optical system according to claim 1, wherein: The following relationship is satisfied: 0.80<ET8 / CT8<3.00; Wherein, ET8 is the edge thickness of the eighth lens, and CT8 is the center thickness of the eighth lens.

19. An imaging module, characterized in that: The optical system comprises a photosensitive element and any one of claims 1 to 18, wherein the photosensitive element is arranged on the image side of the optical system.

20. An electronic device, characterized in that: Including the imaging module described in claim 19.

Images