Optical system, camera module and electronic device

Abstract

The application provides an optical system, a camera module and an electronic device. The optical system comprises, in sequence from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens. The first lens has positive refractive power, the object side surface of the first lens is convex at the optical axis, and the image side surface of the first lens is concave at the optical axis. The second lens has negative refractive power, 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. The eighth lens has negative refractive power, and the object side surface of the eighth lens is convex at the optical axis. The optical system satisfies the relationship: |f12 / f78|<2. The optical system can improve the imaging quality under dark light shooting conditions, ensure that the lens has low sensitivity, improve the performance of the optical system, achieve high resolution and high definition, and is easy to produce.

Description

Technical Field

[0001] This application relates to the field of optical imaging technology, and more particularly to an optical system, camera module, and electronic device. Technical Background

[0002] In recent years, with the advancement of the technology industry and the continuous development of imaging technology, optical imaging systems have been widely used in terminals such as smartphones, tablets, image capture devices, sensors, security systems, 3D recognition systems, and automated equipment. Consumers' demands for the imaging quality of these terminal products are also increasing. Currently, five-element imaging lens technology is relatively mature, but its resolution is increasingly unable to meet consumer needs. On the other hand, the improved performance of photosensitive elements such as CCD and CMOS sensors has led to smaller pixel sizes and increased pixel counts, making it possible to capture high-quality images and providing users with a superior shooting experience. Therefore, high-quality imaging optical systems are needed for terminal products to improve the image quality, resolution, and sharpness of photographed objects. Summary of the Invention

[0003] Therefore, it is necessary to provide an optical system, camera module, and electronic device with better imaging quality.

[0004] In a first aspect, embodiments of this application provide an optical system comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens arranged sequentially from the object side to the image side along the optical axis; wherein the first lens has positive refractive power, and the object side of the first lens is convex at the optical axis, and the image side of the first lens is concave at the optical axis.

[0005] The second lens has negative refractive power, and the object-side surface of the second lens is convex at the optical axis, while the image-side surface of the second lens is concave at the optical axis; the third lens has refractive power; the fourth lens has refractive power; the fifth lens has refractive power; the sixth lens has refractive power; the seventh lens has refractive power; the eighth lens has negative refractive power, and the object-side surface of the eighth lens is convex at the optical axis; the optical system satisfies the following relationship: |f12 / f78|<2; where f12 is the combined focal length of the first and second lenses; and f78 is the combined focal length of the seventh and eighth lenses.

[0006] In the optical system provided in this application embodiment, the refractive power configuration of each lens in the optical system, through the above-mentioned eight-lens structure, can increase the light throughput of the optical system and improve the imaging quality under low-light shooting conditions, making it suitable for shooting in low-light environments such as night scenes, rainy days, and starry skies; when the above relationship f12 / f78|<2 is satisfied, by reasonably allocating the combined focal length of the first lens and the second lens with the combined focal length of the seventh lens and the eighth lens, it is beneficial to correct the higher aberrations of the optical system and improve the performance of the optical system.

[0007] In one embodiment, the optical system satisfies the following relationship: f / EPD < 1.7; where f is the effective focal length of the optical system; and EPD is the entrance pupil diameter of the optical system. Satisfying this relationship allows the optical system to have a large aperture, thereby increasing the amount of light entering the system and improving shooting performance in low-light conditions.

[0008] In one embodiment, the optical system satisfies the following relationship: f tan(HFOV) > 5.15mm; where f is the effective focal length of the optical system; and HFOV is the half field of view of the optical system. When the above relationship is satisfied, the optical system can achieve a large image plane, thus meeting the requirements for high-pixel and high-resolution imaging.

[0009] In one embodiment, the optical system satisfies the following relationship: 2 < |f² / f| < 3; where f is the effective focal length of the optical system and f² is the effective focal length of the second lens. When the above relationship is satisfied, by adjusting the effective focal length of the second lens and the effective focal length of the optical system, the total astigmatism of the optical system can be corrected, thereby enabling the optical system to obtain good imaging quality.

[0010] In one embodiment, the optical system satisfies the following relationship: 1 < |f / f8| < 2; where f is the effective focal length of the optical system and f8 is the effective focal length of the eighth lens. When the above relationship is satisfied, the weakening of the negative optical power of the eighth lens relative to the optical power of the optical system can be effectively controlled, thereby correcting the curvature of the imaging plane of the optical system.

[0011] In one embodiment, the optical system satisfies the following relationship: TTL / Imgh < 1.7, where TTL is the total optical length of the optical system; and Imgh is half the image height corresponding to the maximum field of view of the optical system. Satisfying this relationship effectively compresses the size of the optical system, thereby achieving its ultra-thin characteristics.

[0012] In one embodiment, the optical system satisfies the following relationship: 0.7 mm < CT7 < 0.95 mm; where CT7 is the central thickness of the seventh lens in the optical axis direction. When the above relationship is satisfied, by adjusting the central thickness of the seventh lens, the optical system components are easy to process, and at the same time, the total optical length of the optical system will be shortened.

[0013] In one embodiment, the optical system satisfies the following relationship: 1.5 < f1 / R1 < 2.5; where f1 is the effective focal length of the first lens; R1 is the curvature radius of the object side surface of the first lens at the optical axis. When the above relationship is satisfied, by adjusting the effective focal length of the first lens and the curvature radius of the object side surface of the first lens, the sensitivity of the optical system can be effectively reduced.

[0014] In one embodiment, the optical system satisfies the following relationship: 1 < (R15 + R16) / (R15 - R16) < 3; where R15 is the curvature radius of the object side surface of the eighth lens at the optical axis; R16 is the curvature radius of the image side surface of the eighth lens at the optical axis. When the above relationship is satisfied, by adjusting the curvature radii of the object side surface and the image side surface of the eighth lens, the astigmatism of the optical system can be corrected.

[0015] In a second aspect, an embodiment of the present application provides an imaging module, including the optical system of any one of the above embodiments and an image sensor, and the image sensor is disposed on the image side of the optical system.

[0016] In the imaging module provided by the embodiment of the present application, due to adopting the optical system of any one of the above embodiments, it also has the same technical effects.

[0017] In a third aspect, an embodiment of the present application provides an electronic device, including a housing and the imaging module of the above embodiment, and the imaging module is disposed in the housing.

[0018] In the electronic device provided by the embodiment of the present application, due to adopting the above imaging module, it also has the same technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments or related technologies. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained according to the provided drawings without creative efforts.

[0020] Figure 1 It is a schematic structural diagram of the optical system provided by the first embodiment of the present application.

[0021] Figure 2 The diagrams show the spherical aberration (mm), astigmatism (mm), and distortion (%) of the optical system in the first embodiment.

[0022] Figure 3 This is a schematic diagram of the optical system provided in the second embodiment of this application.

[0023] Figure 4 The diagrams show the spherical aberration (mm), astigmatism (mm), and distortion (%) of the optical system in the second embodiment.

[0024] Figure 5 This is a schematic diagram of the optical system provided in the third embodiment of this application.

[0025] Figure 6 The diagrams show the spherical aberration (mm), astigmatism (mm), and distortion (%) of the optical system in the third embodiment.

[0026] Figure 7 This is a schematic diagram of the optical system provided in the fourth embodiment of this application.

[0027] Figure 8 The diagrams show the spherical aberration (mm), astigmatism (mm), and distortion (%) of the optical system in the fourth embodiment.

[0028] Figure 9 This is a schematic diagram of the optical system provided in the fifth embodiment of this application.

[0029] Figure 10 The diagrams show the spherical aberration (mm), astigmatism (mm), and distortion (%) of the optical system in the fifth embodiment.

[0030] Figure 11 This is a schematic diagram of the optical system provided in the sixth embodiment of this application.

[0031] Figure 12 The diagrams show the spherical aberration (mm), astigmatism (mm), and distortion (%) of the optical system in the sixth embodiment.

[0032] Figure 13 This is a schematic diagram of the optical system provided in the seventh embodiment of this application.

[0033] Figure 14 The diagrams show the spherical aberration (mm), astigmatism (mm), and distortion (%) of the optical system in the seventh embodiment.

[0034] Figure 15 This is a schematic diagram of a camera module provided in one embodiment of this application.

[0035] Figure 16 This is a schematic diagram of an electronic device provided in an embodiment of this application. Detailed Implementation

[0036] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this application.

[0037] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "inner," "outer," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0039] According to a first aspect of this application, an optical system is provided. See also... Figure 1 , Figure 3 , Figure 5 , Figure 7 , Figure 9 , Figure 11 and Figure 13 The optical system 100 implemented in this application includes a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, a third lens L3 with refractive power, a fourth lens L4 with refractive power, a fifth lens L5 with refractive power, a sixth lens L6 with refractive power, a seventh lens L7 with refractive power, and an eighth lens L8 with negative refractive power, arranged sequentially along the optical axis from the object side to the image side.

[0040] 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. Specifically, the object-side surface S1 of the first lens L1 is convex, and the image-side surface S2 of the first lens L1 is concave; the object-side surface S3 of the second lens L2 is convex, and the image-side surface S4 of the second lens L2 is concave; and the object-side surface S15 of the eighth lens L8 is convex. Specifically, the object-side surface S1 of the first lens L1 is convex at the optical axis, and the image-side surface S2 of the first lens L1 is concave at the optical axis; the object-side surface S3 of the second lens L2 is convex at the optical axis, and the image-side surface S4 of the second lens L2 is concave at the optical axis; the object-side surface S15 of the eighth lens L8 is convex at the optical axis.

[0041] In some embodiments, the first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, and eighth lens L8 of the optical system 100 can all be aspherical lenses. The formula for the aspherical parameter is:

[0042]

[0043] In this system, there is a point on the aspherical surface at a distance Y from the optical axis, where X is the distance between the point on the aspherical surface and the tangent plane at the intersection point on the optical axis; Y is the perpendicular distance between the point on the aspherical surface and the optical axis; R is the radius of curvature; k is the conic coefficient; and Ai is the i-th order aspherical coefficient. When the above conditions are met, the lenses of the optical system 100 can be made thinner and lighter, while reducing optical distortion, mitigating the distortion at the edges of wide-angle shots, and achieving better image quality.

[0044] In some embodiments, 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 can all be made of plastic. Plastic lenses can reduce the weight of the optical system 100 and lower production costs.

[0045] In some embodiments, 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 can all be made of glass. Glass lenses can withstand higher temperatures and have better optical performance.

[0046] In other embodiments, only the first lens L1 may be made of glass, while the other lenses may be made of plastic. In this case, the first lens L1, which is closest to the object side, can better withstand the high ambient temperature on the object side, and the production cost of the optical system 100 can be reduced because the other lenses are made of plastic.

[0047] In some embodiments, the optical system 100 further includes an aperture stop STO, which may be an aperture stop disposed on the object side of the first lens L1. An imaging surface S19 may also be disposed on the image side of the eighth lens L8, which may be the surface of an image sensor. It is understood that light carrying information about the object being photographed can sequentially pass through the aperture stop STO, 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 before finally being imaged onto the imaging surface S19.

[0048] In some embodiments, an infrared cut-off filter 110 may also be provided on the image side of the eighth lens L8. In other embodiments, the infrared cut-off filter 110 may also be provided on the object side of the first lens L1. By providing the infrared cut-off filter 110, the optical system 100 can filter out infrared light, preventing infrared light from reaching the image sensor and interfering with normal visible light imaging, thereby improving image quality. It should be noted that in some embodiments, the optical system 100 may not include the infrared cut-off filter 110 and the image sensor. In this case, the infrared cut-off filter 110 may be provided together with the image sensor in the camera module when the optical system 100 and the image sensor are packaged together into a camera module.

[0049] Furthermore, the optical system 100 satisfies the following relationship: |f12 / f78|<2; f12 is the combined focal length of the first lens L1 and the second lens L2; ​​f78 is the combined focal length of the seventh lens L7 and the eighth lens L8.

[0050] In the optical system 100 provided in this application embodiment, the light throughput of the optical system 100 can be increased and the imaging quality under low-light shooting conditions can be improved by the above-mentioned eight-lens structure and the refractive power configuration of each lens of the optical system 100. It is suitable for shooting in low-light environments such as night scenes, rainy days, and starry skies. When the relationship |f12 / f78|<2 is satisfied, by reasonably allocating the combined focal length of the first lens L1 and the second lens L2 with the combined focal length of the seventh lens L7 and the eighth lens L8, it is beneficial to correct the higher aberrations of the optical system 100 and improve the performance of the optical system 100.

[0051] In some embodiments, the optical system 100 satisfies the following relationship: f / EPD < 1.7; where f is the effective focal length of the optical system 100; and EPD is the entrance pupil diameter of the optical system 100. When the above relationship is satisfied, the optical system 100 can have the characteristic of a large aperture, so that the optical system 100 has a larger light input amount, improving the shooting effect under dark conditions. <00^00132><00^00133>In some embodiments, the optical system 100 satisfies the following relationship: f <00^00134>tan(HFOV) > 5.15 mm; where f is the effective focal length of the optical system 100; and HFOV is the half field angle of the optical system 100. When the above relationship is satisfied, the imaging of the optical system 100 can have the characteristic of a large image plane, so that the optical system 100 meets the requirements of high pixel and high definition for imaging quality. <00^00135><^

[0053] In some embodiments, the optical system 100 satisfies the following relationship: 2 < |f2 / f| < 3; where f is the effective focal length of the optical system 100; and f2 is the effective focal length of the second lens L2. When the above relationship is satisfied, by adjusting the effective focal length of the second lens L2 and the effective focal length of the optical system 100, the total astigmatism of the optical system 100 can be corrected, so that the optical system 100 obtains good imaging quality. <^ <^

[0054] In some embodiments, the optical system 100 satisfies the following relationship: 1 < |f / f8| < 2; where f is the effective focal length of the optical system 100; and f8 is the effective focal length of the eighth lens L8. When the above relationship is satisfied, the weakening of the negative optical power of the eighth lens L8 relative to the optical power of the optical system 100 can be effectively controlled, and then the curvature of the imaging plane of the optical system 100 can be corrected. <^ <^

[0055] In some embodiments, the optical system 100 satisfies the following relationship: TTL / Imgh < 1.7 where TTL is the total optical length of the optical system 100; and ImgH is half of the image height corresponding to the maximum field angle of the optical system 100. When the above relationship is satisfied, the size of the optical system 100 can be effectively compressed, and then the ultra-thin characteristic of the optical system 100 can be realized. <^ <^

[0056] In some embodiments, the optical system 100 satisfies the following relationship: 0.7 mm < CT7 < 0.95 mm; where CT7 is the central thickness of the seventh lens L7 in the optical axis direction. When the above relationship is satisfied, by adjusting the central thickness of the seventh lens L7, the components of the optical system 100 are easy to process, and at the same time, the total optical length of the optical system 100 will be shortened. [[ID=I8]]<^ <^

[0057] In some embodiments, the optical system 100 satisfies the following relationship: 1.5 < f1 / R1 < 2.5; where f1 is the effective focal length of the first lens L1, and R1 is the curvature radius of the object side surface of the first lens L1 at the optical axis. When the above relationship is satisfied, by adjusting the effective focal length of the first lens L1 and the surface radius of the object side surface of the first lens L1, the sensitivity of the optical system 100 can be effectively reduced.

[0058] In some embodiments, the optical system 100 satisfies the following relationship:

[0059] 1 < (R15 + R16) / (R15 - R16) < 3; where R15 is the curvature radius of the object side surface S15 of the eighth lens L8 at the optical axis, and R16 is the curvature radius of the image side surface S16 of the eighth lens L8 at the optical axis. When the above relationship is satisfied, by adjusting the surface radii of the object side surface S15 and the image side surface S16 of the eighth lens L8, the astigmatism of the optical system 100 can be corrected.

[0060] ​​​​​​​​Specifically, the object-side surface S1 of the first lens L1 is convex at the optical axis, and the image-side surface S2 of the first lens L1 is concave at the optical axis; 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; the object-side surface S3 of the second lens L2 is convex at the optical axis, and the image-side surface S4 of the second lens L2 is concave at the optical axis; 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; the third lens L3 has positive refractive power, and the third lens... The object-side surface S5 of lens L3 is convex along the optical axis; the image-side surface S6 of the third lens L3 is convex along the optical axis; the object-side surface S5 of the third lens L3 is concave around the circumference; the image-side surface S6 of the third lens L3 is convex around the circumference; the fourth lens L4 has positive refractive power; the object-side surface S7 of the fourth lens L4 is concave along the optical axis; the image-side surface S8 of the fourth lens L4 is convex along the optical axis; the object-side surface S7 of the fourth lens L4 is concave around the circumference; the image-side surface S8 of the fourth lens L4 is convex around the circumference; the fifth lens L5 has negative refractive power. The object-side surface S9 of the fifth lens L5 is concave at the optical axis, and the image-side surface S10 of the fifth lens L5 is concave at the optical axis; 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; the sixth lens L6 has positive refractive power, the object-side surface S11 of the sixth lens L6 is concave at the optical axis, and the image-side surface S12 of the sixth lens L6 is convex at the optical axis; the object-side surface S11 of the sixth lens L6 is convex at the circumference, and the image-side surface S12 of the sixth lens L6 is convex at the circumference. The seventh lens L7 has negative refractive power. The object-side surface S13 of the seventh lens L7 is convex at the optical axis, and the image-side surface S14 of the seventh lens L7 is concave at the optical axis. 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. The object-side surface S15 of the eighth lens L8 is convex at the optical axis, and the image-side surface S16 of the eighth lens L8 is concave at the optical axis. 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.

[0063] In the optical system 100 provided in this application embodiment, the light throughput of the optical system 100 can be increased and the imaging quality can be improved under low light shooting conditions through the above-mentioned eight-lens structure and the refractive power configuration of each lens of the optical system 100. It is suitable for shooting in low light environments such as night scenes, rainy days, and starry skies.

[0064] In the first embodiment, the optical system 100 has a total effective focal length f=6.58mm, an aperture number FNO=1.66, a field of view FOV=76.45 degrees, and a total optical length TTL=8.6mm.

[0065] Furthermore, the parameters of the optical system 100 are given in Tables 1 and 2. The elements from the object side to the image side are arranged sequentially from top to bottom according to Table 1. In the same lens, the surface with the smaller face number is the object side of the lens, and the surface with the larger face number is the image side of the lens. For example, face numbers 1 and 2 correspond to the object side S1 and image side S2 of the first lens L1, respectively. The radii in Table 1 are the radii of curvature of the corresponding object side or image side at the optical axis. The first value in the "thickness" parameter column of the first lens L1 is the thickness of the lens along the optical axis (center thickness), and the second value is the distance along the optical axis from the image side of this lens to the object side of the next lens. The value of the aperture stop in the "Thickness" parameter column represents the distance from the aperture stop to the vertex of the object side of the next lens (the vertex refers to the intersection of the lens and the optical axis) along the optical axis. By default, the direction from the object side of the first lens to the image side of the last lens is the positive direction of the optical axis. When this value is negative, it indicates that the aperture stop is located to the right of the vertex of the object side of the next lens. If the aperture stop thickness is positive, the aperture stop is to the left of the vertex of the object side of the next lens. Table 2 shows the relevant parameters of the aspherical surfaces of each lens in Table 1, where k is the conic coefficient and Ai is the i-th order aspherical coefficient.

[0066] Table 1

[0067]

[0068] Table 2

[0069]

[0070] Further, please refer to Figure 2 (A), Figure 2 (A) is a graph showing the spherical aberration curves of light rays at wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm in the first embodiment. The horizontal axis along the X-axis represents the focal shift, and the vertical axis along the Y-axis represents the normalized field of view. Figure 2 (A) It can be seen that the spherical aberration values ​​corresponding to wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm are better, indicating that the imaging quality of the optical system 100 in this embodiment is better.

[0071] Please see Figure 2 (B) Figure 2 (B) is the astigmatism diagram of the light at a wavelength of 555 nm in the first embodiment. The horizontal axis along the X-axis represents the focal shift, and the vertical axis along the Y-axis represents the image height. Figure 2 (B) It can be seen that the astigmatism of the optical system 100 is well compensated.

[0072] Please see Figure 2 (C), Figure 2 (C) is a distortion curve at a wavelength of 555 nm in the first embodiment. The horizontal axis along the X-axis represents distortion, and the vertical axis along the Y-axis represents image height. Figure 2 (C) It can be seen that the distortion of the optical system 100 has been well corrected.

[0073] Second Embodiment

[0074] like Figure 3 As shown, in the second embodiment, the optical system 100 includes a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, a third lens L3 with refractive power, a fourth lens L4 with refractive power, a fifth lens L5 with refractive power, a sixth lens L6 with refractive power, a seventh lens L7 with refractive power, and an eighth lens L8 with negative refractive power, arranged sequentially from the object side to the image side along the optical axis.

[0075] Specifically, the object-side surface S1 of the first lens L1 is convex at the optical axis, and the image-side surface S2 of the first lens L1 is concave at the optical axis; 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; the object-side surface S3 of the second lens L2 is convex at the optical axis, and the image-side surface S4 of the second lens L2 is concave at the optical axis; 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; the third lens L3 has positive refractive power, and the third lens... The object-side surface S5 of lens L3 is convex along the optical axis; the image-side surface S6 of the third lens L3 is convex along the optical axis; the object-side surface S5 of the third lens L3 is concave around the circumference; the image-side surface S6 of the third lens L3 is convex around the circumference; the fourth lens L4 has positive refractive power; the object-side surface S7 of the fourth lens L4 is concave along the optical axis; the image-side surface S8 of the fourth lens L4 is convex along the optical axis; the object-side surface S7 of the fourth lens L4 is concave around the circumference; the image-side surface S8 of the fourth lens L4 is convex around the circumference; the fifth lens L5 has negative refractive power. The object-side surface S9 of the fifth lens L5 is concave at the optical axis, and the image-side surface S10 of the fifth lens L5 is convex at the optical axis; 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; the sixth lens L6 has positive refractive power, the object-side surface S11 of the sixth lens L6 is concave at the optical axis, and the image-side surface S12 of the sixth lens L6 is convex at the optical axis; the object-side surface S11 of the sixth lens L6 is convex at the circumference, and the image-side surface S12 of the sixth lens L6 is convex at the circumference. The seventh lens L7 has negative refractive power. The object-side surface S13 of the seventh lens L7 is convex at the optical axis, and the image-side surface S14 of the seventh lens L7 is concave at the optical axis. 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. The object-side surface S15 of the eighth lens L8 is convex at the optical axis, and the image-side surface S16 of the eighth lens L8 is concave at the optical axis. 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.

[0076] In the optical system 100 provided in this application embodiment, the light throughput of the optical system 100 can be increased and the imaging quality can be improved under low light shooting conditions through the above-mentioned eight-lens structure and the refractive power configuration of each lens of the optical system 100. It is suitable for shooting in low light environments such as night scenes, rainy days, and starry skies.

[0077] In the second embodiment, the total effective focal length of the optical system 100 is f=6.53mm, the aperture number FNO=1.66, the field of view FOV=77.14 degrees, and the total optical length TTL of the optical system 100 is 8.6mm.

[0078] Furthermore, the parameters of the optical system 100 are given in Tables 3 and 4. The elements from the object side to the image side are arranged sequentially from top to bottom according to Table 3. In the same lens, the surface with the smaller surface number is the object side of the lens, and the surface with the larger surface number is the image side of the lens. For example, surface numbers 1 and 2 correspond to the object side S1 and image side S2 of the first lens L1, respectively. The radii in Table 3 are the radii of curvature of the corresponding object side or image side at the optical axis. The first value in the "thickness" parameter column of the first lens L1 is the thickness of the lens along the optical axis (center thickness), and the second value is the distance along the optical axis from the image side of this lens to the object side of the next lens. The value of the aperture stop in the "Thickness" parameter column represents the distance from the aperture stop to the vertex of the object side of the next lens (the vertex refers to the intersection of the lens and the optical axis) along the optical axis. By default, the direction from the object side of the first lens to the image side of the last lens is the positive direction of the optical axis. When this value is negative, it indicates that the aperture stop is located to the right of the vertex of the object side of the next lens. If the aperture stop thickness is positive, the aperture stop is to the left of the vertex of the object side of the next lens. Table 4 shows the relevant parameters of the aspherical surfaces of each lens in Table 3, where k is the conic coefficient and Ai is the i-th order aspherical coefficient.

[0079] Table 3

[0080]

[0081] Table 4

[0082]

[0083] Further, please refer to Figure 4 (A), Figure 4 (A) is a graph showing the spherical aberration curves of light rays at wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm in the second embodiment. The horizontal axis along the X-axis represents the focal shift, and the vertical axis along the Y-axis represents the normalized field of view. Figure 2 (A) It can be seen that the spherical aberration values ​​corresponding to wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm are better, indicating that the imaging quality of the optical system 100 in this embodiment is better.

[0084] Please see Figure 4 (B) Figure 4 (B) is the astigmatism diagram of the light at a wavelength of 555 nm in the second embodiment. The horizontal axis along the X-axis represents the focal shift, and the vertical axis along the Y-axis represents the image height. Figure 4 (B) It can be seen that the astigmatism of the optical system 100 is well compensated.

[0085] Please see Figure 4 (C), Figure 4 (C) is the distortion curve at a wavelength of 555nm in the second embodiment. The horizontal axis along the X-axis represents distortion, and the vertical axis along the Y-axis represents image height. Figure 4 (C) It can be seen that the distortion of the optical system 100 has been well corrected.

[0086] Third Embodiment

[0087] like Figure 5 As shown, in the third embodiment, the optical system 100 includes a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, a third lens L3 with refractive power, a fourth lens L4 with refractive power, a fifth lens L5 with refractive power, a sixth lens L6 with refractive power, a seventh lens L7 with refractive power, and an eighth lens L8 with negative refractive power, arranged sequentially from the object side to the image side along the optical axis.

[0088] Specifically, the object-side surface S1 of the first lens L1 is convex at the optical axis, and the image-side surface S2 of the first lens L1 is concave at the optical axis; 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; the object-side surface S3 of the second lens L2 is convex at the optical axis, and the image-side surface S4 of the second lens L2 is concave at the optical axis; 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; the third lens L3 has positive refractive power, and the third lens... The object-side surface S5 of lens L3 is convex along the optical axis; the image-side surface S6 of the third lens L3 is convex along the optical axis; the object-side surface S5 of the third lens L3 is concave around the circumference; the image-side surface S6 of the third lens L3 is convex around the circumference; the fourth lens L4 has positive refractive power; the object-side surface S7 of the fourth lens L4 is concave along the optical axis; the image-side surface S8 of the fourth lens L4 is convex along the optical axis; the object-side surface S7 of the fourth lens L4 is concave around the circumference; the image-side surface S8 of the fourth lens L4 is convex around the circumference; the fifth lens L5 has negative refractive power. The object-side surface S9 of the fifth lens L5 is concave at the optical axis, and the image-side surface S10 of the fifth lens L5 is concave at the optical axis; 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; the sixth lens L6 has positive refractive power, the object-side surface S11 of the sixth lens L6 is concave at the optical axis, and the image-side surface S12 of the sixth lens L6 is convex at the optical axis; 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. The seventh lens L7 has positive refractive power. The object-side surface S13 of the seventh lens L7 is convex at the optical axis, and the image-side surface S14 of the seventh lens L7 is concave at the optical axis. 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. The object-side surface S15 of the eighth lens L8 is convex at the optical axis, and the image-side surface S16 of the eighth lens L8 is concave at the optical axis. 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.

[0089] In the optical system 100 provided in this application embodiment, the light throughput of the optical system 100 can be increased and the imaging quality can be improved under low light shooting conditions through the above-mentioned eight-lens structure and the refractive power configuration of each lens of the optical system 100. It is suitable for shooting in low light environments such as night scenes, rainy days, and starry skies.

[0090] In the third embodiment, the total effective focal length of the optical system 100 is f=6.64mm, the number of apertures FNO=1.66, the field of view FOV=76 degrees, and the total optical length TTL of the optical system 100 is 8.6mm.

[0091] Furthermore, the parameters of the optical system 100 are given in Tables 5 and 6. The elements from the object side to the image side are arranged sequentially from top to bottom according to Table 5. In the same lens, the surface with the smaller surface number is the object side of the lens, and the surface with the larger surface number is the image side of the lens. For example, surface numbers 1 and 2 correspond to the object side S1 and image side S2 of the first lens L1, respectively. The radii in Table 5 are the radii of curvature of the corresponding object side or image side at the optical axis. The first value in the "thickness" parameter column of the first lens L1 is the thickness of the lens along the optical axis (center thickness), and the second value is the distance along the optical axis from the image side of this lens to the object side of the next lens. The value of the aperture stop in the "Thickness" parameter column represents the distance from the aperture stop to the vertex of the object side of the next lens (the vertex refers to the intersection of the lens and the optical axis) along the optical axis. By default, the direction from the object side of the first lens to the image side of the last lens is the positive direction of the optical axis. When this value is negative, it indicates that the aperture stop is located to the right of the vertex of the object side of the next lens. If the aperture stop thickness is positive, the aperture stop is to the left of the vertex of the object side of the next lens. Table 6 is a table of relevant parameters for the aspherical surfaces of each lens in Table 5, where k is the conic coefficient and Ai is the i-th order aspherical coefficient.

[0092] Table 5

[0093]

[0094] Table 6

[0095]

[0096] Further, please refer to Figure 6 (A), Figure 6 (A) is a graph showing the spherical aberration curves of light rays at wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm in the third embodiment. The horizontal axis along the X-axis represents the focal shift, and the vertical axis along the Y-axis represents the normalized field of view. Figure 6 (A) It can be seen that the spherical aberration values ​​corresponding to wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm are better, indicating that the imaging quality of the optical system 100 in this embodiment is better.

[0097] Please see Figure 6 (B) Figure 6 (B) is the astigmatism diagram of the light at a wavelength of 555 nm in the third embodiment. The horizontal axis along the X-axis represents the focal shift, and the vertical axis along the Y-axis represents the image height. Figure 6 (B) It can be seen that the astigmatism of the optical system 100 is well compensated.

[0098] Please see Figure 6 (C), Figure 6 (C) is the distortion curve at a wavelength of 555nm in the third embodiment. The horizontal axis along the X-axis represents distortion, and the vertical axis along the Y-axis represents image height. Figure 6 (C) It can be seen that the distortion of the optical system 100 has been well corrected.

[0099] Fourth embodiment

[0100] like Figure 7 As shown, in the fourth embodiment, the optical system 100 includes a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, a third lens L3 with refractive power, a fourth lens L4 with refractive power, a fifth lens L5 with refractive power, a sixth lens L6 with refractive power, a seventh lens L7 with refractive power, and an eighth lens L8 with negative refractive power, arranged sequentially from the object side to the image side along the optical axis.

[0101] Specifically, the object-side surface S1 of the first lens L1 is convex at the optical axis, and the image-side surface S2 of the first lens L1 is concave at the optical axis; 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; the object-side surface S3 of the second lens L2 is convex at the optical axis, and the image-side surface S4 of the second lens L2 is concave at the optical axis; 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; the third lens L3 has negative refractive power, and the third lens... The object-side surface S5 of lens L3 is convex along the optical axis, and the image-side surface S6 of the third lens L3 is concave along the optical axis; the object-side surface S5 of the third lens L3 is concave around the circumference, and the image-side surface S6 of the third lens L3 is convex around the circumference; the fourth lens L4 has negative refractive power, and the object-side surface S7 of the fourth lens L4 is convex along the optical axis, and the image-side surface S8 of the fourth lens L4 is convex along the optical axis; the object-side surface S7 of the fourth lens L4 is concave around the circumference, and the image-side surface S8 of the fourth lens L4 is convex around the circumference; the fifth lens L5 has negative refractive power. The object-side surface S9 of the fifth lens L5 is concave at the optical axis, and the image-side surface S10 of the fifth lens L5 is concave at the optical axis; 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; the sixth lens L6 has positive refractive power, the object-side surface S11 of the sixth lens L6 is concave at the optical axis, and the image-side surface S12 of the sixth lens L6 is convex at the optical axis; 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. The seventh lens L7 has negative refractive power. The object-side surface S13 of the seventh lens L7 is convex at the optical axis, and the image-side surface S14 of the seventh lens L7 is concave at the optical axis. 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. The object-side surface S15 of the eighth lens L8 is convex at the optical axis, and the image-side surface S16 of the eighth lens L8 is concave at the optical axis. 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.

[0102] In the optical system 100 provided in this application embodiment, the light throughput of the optical system 100 can be increased and the imaging quality can be improved under low light shooting conditions through the above-mentioned eight-lens structure and the refractive power configuration of each lens of the optical system 100. It is suitable for shooting in low light environments such as night scenes, rainy days, and starry skies.

[0103] In the fourth embodiment, the total effective focal length of the optical system 100 is f=6.61mm, the number of apertures FNO=1.662, the field of view FOV=76.2 degrees, and the total optical length TTL of the optical system 100 is 8.6mm.

[0104] Furthermore, the parameters of the optical system 100 are given in Tables 7 and 8. The elements from the object side to the image side are arranged sequentially from top to bottom according to Table 7. In the same lens, the surface with the smaller surface number is the object side of the lens, and the surface with the larger surface number is the image side of the lens. For example, surface numbers 1 and 2 correspond to the object side S1 and image side S2 of the first lens L1, respectively. The radii in Table 7 are the radii of curvature of the corresponding object side or image side at the optical axis. The first value in the "thickness" parameter column of the first lens L1 is the thickness of the lens along the optical axis (center thickness), and the second value is the distance along the optical axis from the image side of this lens to the object side of the next lens. The value of the aperture stop in the "Thickness" parameter column represents the distance from the aperture stop to the vertex of the object side of the next lens (the vertex refers to the intersection of the lens and the optical axis) along the optical axis. By default, the direction from the object side of the first lens to the image side of the last lens is the positive direction of the optical axis. When this value is negative, it indicates that the aperture stop is located to the right of the vertex of the object side of the next lens. If the aperture stop thickness is positive, the aperture stop is to the left of the vertex of the object side of the next lens. Table 8 shows the relevant parameters of the aspherical surfaces of each lens in Table 7, where k is the conic coefficient and Ai is the i-th order aspherical coefficient.

[0105] Table 7

[0106]

[0107] Table 8

[0108]

[0109] Further, please refer to Figure 8 (A), Figure 8 (A) is a graph showing the spherical aberration curves of light rays at wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm in the fourth embodiment. The horizontal axis along the X-axis represents the focal shift, and the vertical axis along the Y-axis represents the normalized field of view. Figure 8 (A) It can be seen that the spherical aberration values ​​corresponding to wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm are better, indicating that the imaging quality of the optical system 100 in this embodiment is better.

[0110] Please see Figure 8 (B) Figure 8 (B) is the astigmatism diagram of the light at a wavelength of 555 nm in the fourth embodiment. The horizontal axis along the X-axis represents the focal shift, and the vertical axis along the Y-axis represents the image height. Figure 8 (B) It can be seen that the astigmatism of the optical system 100 is well compensated.

[0111] Please see Figure 8 (C), Figure 8 (C) is the distortion curve at a wavelength of 555nm in the fourth embodiment. The horizontal axis along the X-axis represents distortion, and the vertical axis along the Y-axis represents image height. Figure 8 (C) It can be seen that the distortion of the optical system 100 has been well corrected.

[0112] Fifth Embodiment

[0113] like Figure 9 As shown, in the fifth embodiment, the optical system 100 includes a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, a third lens L3 with refractive power, a fourth lens L4 with refractive power, a fifth lens L5 with refractive power, a sixth lens L6 with refractive power, a seventh lens L7 with refractive power, and an eighth lens L8 with negative refractive power, arranged sequentially from the object side to the image side along the optical axis.

[0114] Specifically, the object-side surface S1 of the first lens L1 is convex at the optical axis, and the image-side surface S2 of the first lens L1 is concave at the optical axis; 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; the object-side surface S3 of the second lens L2 is convex at the optical axis, and the image-side surface S4 of the second lens L2 is concave at the optical axis; 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; the third lens L3 has positive refractive power, and the third lens... The object-side surface S5 of lens L3 is convex along the optical axis; the image-side surface S6 of the third lens L3 is convex along the optical axis; the object-side surface S5 of the third lens L3 is concave around the circumference; the image-side surface S6 of the third lens L3 is convex around the circumference; the fourth lens L4 has negative refractive power; the object-side surface S7 of the fourth lens L4 is concave along the optical axis; the image-side surface S8 of the fourth lens L4 is convex along the optical axis; the object-side surface S7 of the fourth lens L4 is concave around the circumference; the image-side surface S8 of the fourth lens L4 is convex around the circumference; the fifth lens L5 has negative refractive power. The object-side surface S9 of the fifth lens L5 is concave at the optical axis, and the image-side surface S10 of the fifth lens L5 is concave at the optical axis; 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; the sixth lens L6 has positive refractive power, the object-side surface S11 of the sixth lens L6 is concave at the optical axis, and the image-side surface S12 of the sixth lens L6 is convex at the optical axis; 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. The seventh lens L7 has negative refractive power. The object-side surface S13 of the seventh lens L7 is convex at the optical axis, and the image-side surface S14 of the seventh lens L7 is concave at the optical axis. 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. The object-side surface S15 of the eighth lens L8 is convex at the optical axis, and the image-side surface S16 of the eighth lens L8 is concave at the optical axis. 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.

[0115] In the optical system 100 provided in this application embodiment, the light throughput of the optical system 100 can be increased and the imaging quality can be improved under low light shooting conditions through the above-mentioned eight-lens structure and the refractive power configuration of each lens of the optical system 100. It is suitable for shooting in low light environments such as night scenes, rainy days, and starry skies.

[0116] In the fifth embodiment, the total effective focal length of the optical system 100 is f=6.66mm, the number of apertures FNO=1.661, the field of view FOV=75.8 degrees, and the total optical length TTL of the optical system 100 is 8.6mm.

[0117] In addition, the parameters of the optical system 100 are given in Tables 9 and 10. The elements from the object side to the image side are arranged sequentially from top to bottom according to Table 9. In the same lens, the surface with the smaller surface number is the object side of the lens, and the surface with the larger surface number is the image side of the lens. For example, surface numbers 1 and 2 correspond to the object side S1 and image side S2 of the first lens L1, respectively. The radii in Table 9 are the radii of curvature of the corresponding object side or image side at the optical axis. The first value in the "thickness" parameter column of the first lens L1 is the thickness of the lens along the optical axis (center thickness), and the second value is the distance along the optical axis from the image side of the first lens to the object side of the next lens. The value of the aperture stop in the "Thickness" parameter column represents the distance from the aperture stop to the vertex of the object side of the next lens (the vertex refers to the intersection of the lens and the optical axis) along the optical axis. By default, the direction from the object side of the first lens to the image side of the last lens is the positive direction of the optical axis. When this value is negative, it indicates that the aperture stop is located to the right of the vertex of the object side of the next lens. If the aperture stop thickness is positive, the aperture stop is to the left of the vertex of the object side of the next lens. Table 10 shows the relevant parameters of the aspherical surfaces of each lens in Table 9, where k is the cone coefficient and Ai is the i-th order aspherical coefficient.

[0118] Table 9

[0119]

[0120] Table 10

[0121]

[0122] Further, please refer to Figure 10 (A), Figure 10 (A) is a graph showing the spherical aberration curves of light rays at wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm in the fifth embodiment. The horizontal axis along the X-axis represents the focal shift, and the vertical axis along the Y-axis represents the normalized field of view. Figure 10 (A) It can be seen that the spherical aberration values ​​corresponding to wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm are better, indicating that the imaging quality of the optical system 100 in this embodiment is better.

[0123] Please see Figure 10 (B) Figure 10 (B) is the astigmatism diagram of the light at a wavelength of 555 nm in the fifth embodiment. The horizontal axis along the X-axis represents the focal shift, and the vertical axis along the Y-axis represents the image height. Figure 10 (B) It can be seen that the astigmatism of the optical system 100 is well compensated.

[0124] Please see Figure 10 (C), Figure 10 (C) is the distortion curve at a wavelength of 555nm in the fifth embodiment. The horizontal axis along the X-axis represents distortion, and the vertical axis along the Y-axis represents image height. Figure 10 (C) It can be seen that the distortion of the optical system 100 has been well corrected.

[0125] Sixth Embodiment

[0126] like Figure 11 As shown, in the sixth embodiment, the optical system 100 includes a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, a third lens L3 with refractive power, a fourth lens L4 with refractive power, a fifth lens L5 with refractive power, a sixth lens L6 with refractive power, a seventh lens L7 with refractive power, and an eighth lens L8 with negative refractive power, arranged sequentially from the object side to the image side along the optical axis.

[0127] Specifically, the object-side surface S1 of the first lens L1 is convex at the optical axis, and the image-side surface S2 of the first lens L1 is concave at the optical axis; 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; the object-side surface S3 of the second lens L2 is convex at the optical axis, and the image-side surface S4 of the second lens L2 is concave at the optical axis; 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; the third lens L3 has positive refractive power, and the third lens... The object-side surface S5 of lens L3 is convex along the optical axis; the image-side surface S6 of the third lens L3 is convex along the optical axis; the object-side surface S5 of the third lens L3 is concave around the circumference; the image-side surface S6 of the third lens L3 is convex around the circumference; the fourth lens L4 has negative refractive power; the object-side surface S7 of the fourth lens L4 is concave along the optical axis; the image-side surface S8 of the fourth lens L4 is concave along the optical axis; the object-side surface S7 of the fourth lens L4 is concave around the circumference; the image-side surface S8 of the fourth lens L4 is convex around the circumference; the fifth lens L5 has positive refractive power. The object-side surface S9 of the fifth lens L5 is convex at the optical axis, and the image-side surface S10 of the fifth lens L5 is concave at the optical axis; 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; the sixth lens L6 has positive refractive power, the object-side surface S11 of the sixth lens L6 is concave at the optical axis, and the image-side surface S12 of the sixth lens L6 is convex at the optical axis; 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. The seventh lens L7 has negative refractive power. The object-side surface S13 of the seventh lens L7 is convex at the optical axis, and the image-side surface S14 of the seventh lens L7 is concave at the optical axis. 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. The object-side surface S15 of the eighth lens L8 is convex at the optical axis, and the image-side surface S16 of the eighth lens L8 is concave at the optical axis. 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.

[0128] In the optical system 100 provided in this application embodiment, the light throughput of the optical system 100 can be increased and the imaging quality can be improved under low light shooting conditions through the above-mentioned eight-lens structure and the refractive power configuration of each lens of the optical system 100. It is suitable for shooting in low light environments such as night scenes, rainy days, and starry skies.

[0129] In the sixth embodiment, the total effective focal length of the optical system 100 is f=6.67mm, the number of apertures FNO=1.66, the field of view FOV=75.66 degrees, and the total optical length TTL of the optical system 100 is 8.6mm.

[0130] In addition, the parameters of the optical system 100 are given in Tables 11 and 12. The elements from the object side to the image side are arranged sequentially from top to bottom according to the elements in Table 11. In the same lens, the surface with the smaller surface number is the object side of the lens, and the surface with the larger surface number is the image side of the lens. For example, surface numbers 1 and 2 correspond to the object side S1 and image side S2 of the first lens L1, respectively. The radii in Table 11 are the radii of curvature of the object side or image side of the corresponding surface number along the optical axis. The first value in the "thickness" parameter column of the first lens L1 is the thickness of the lens along the optical axis (center thickness), and the second value is the distance along the optical axis from the image side of the lens to the object side of the next lens. The value of the aperture stop in the "Thickness" parameter column represents the distance from the aperture stop to the vertex of the object side of the next lens (the vertex refers to the intersection of the lens and the optical axis) along the optical axis. By default, the direction from the object side of the first lens to the image side of the last lens is the positive direction of the optical axis. When this value is negative, it indicates that the aperture stop is located to the right of the vertex of the object side of the next lens. If the aperture stop thickness is positive, the aperture stop is to the left of the vertex of the object side of the next lens. Table 12 shows the relevant parameters of the aspherical surfaces of each lens in Table 11, where k is the conic coefficient and Ai is the i-th order aspherical coefficient.

[0131] Table 11

[0132]

[0133] Table 12

[0134]

[0135] Further, please refer to Figure 12 (A), Figure 12 (A) is a graph showing the spherical aberration curves of light rays at wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm in the sixth embodiment. The horizontal axis along the X-axis represents the focal shift, and the vertical axis along the Y-axis represents the normalized field of view. Figure 12 (A) It can be seen that the spherical aberration values ​​corresponding to wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm are better, indicating that the imaging quality of the optical system 100 in this embodiment is better.

[0136] Please see Figure 12 (B) Figure 12 (B) is the astigmatism diagram of the light at a wavelength of 555nm in the sixth embodiment. The horizontal axis along the X-axis represents the focal shift, and the vertical axis along the Y-axis represents the image height. Figure 12 (B) It can be seen that the astigmatism of the optical system 100 is well compensated.

[0137] Please see Figure 12 (C), Figure 12 (C) is the distortion curve at a wavelength of 555nm in the sixth embodiment. The horizontal axis along the X-axis represents distortion, and the vertical axis along the Y-axis represents image height. Figure 12 (C) It can be seen that the distortion of the optical system 100 has been well corrected.

[0138] Seventh Embodiment

[0139] like Figure 13 As shown, in the seventh embodiment, the optical system 100 includes a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, a third lens L3 with refractive power, a fourth lens L4 with refractive power, a fifth lens L5 with refractive power, a sixth lens L6 with refractive power, a seventh lens L7 with refractive power, and an eighth lens L8 with negative refractive power, arranged sequentially from the object side to the image side along the optical axis.

[0140] Specifically, the object-side surface S1 of the first lens L1 is convex at the optical axis, and the image-side surface S2 of the first lens L1 is concave at the optical axis; 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; the object-side surface S3 of the second lens L2 is convex at the optical axis, and the image-side surface S4 of the second lens L2 is concave at the optical axis; 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; the third lens L3 has positive refractive power, and the third lens... The object-side surface S5 of lens L3 is convex along the optical axis; the image-side surface S6 of the third lens L3 is convex along the optical axis; the object-side surface S5 of the third lens L3 is concave around the circumference; the image-side surface S6 of the third lens L3 is convex around the circumference; the fourth lens L4 has negative refractive power; the object-side surface S7 of the fourth lens L4 is concave along the optical axis; the image-side surface S8 of the fourth lens L4 is convex along the optical axis; the object-side surface S7 of the fourth lens L4 is concave around the circumference; the image-side surface S8 of the fourth lens L4 is convex around the circumference; the fifth lens L5 has negative refractive power. The object-side surface S9 of the fifth lens L5 is concave at the optical axis, and the image-side surface S10 of the fifth lens L5 is concave at the optical axis; 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; the sixth lens L6 has negative refractive power, the object-side surface S11 of the sixth lens L6 is concave at the optical axis, and the image-side surface S12 of the sixth lens L6 is convex at the optical axis; 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 concave at the circumference. The seventh lens L7 has positive refractive power. The object-side surface S13 of the seventh lens L7 is convex at the optical axis, and the image-side surface S14 of the seventh lens L7 is concave at the optical axis. 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. The object-side surface S15 of the eighth lens L8 is convex at the optical axis, and the image-side surface S16 of the eighth lens L8 is concave at the optical axis. 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.

[0141] In the optical system 100 provided in this application embodiment, the light throughput of the optical system 100 can be increased and the imaging quality can be improved under low light shooting conditions through the above-mentioned eight-lens structure and the refractive power configuration of each lens of the optical system 100. It is suitable for shooting in low light environments such as night scenes, rainy days, and starry skies.

[0142] In the seventh embodiment, the total effective focal length of the optical system 100 is f=6.69mm, the aperture number FNO=1.65, the field of view FOV=76.6 degrees, and the total optical length TTL of the optical system 100 is 8.57mm.

[0143] Furthermore, the parameters of the optical system 100 are given in Tables 13 and 14. The elements from the object side to the image side are arranged sequentially from top to bottom according to Table 13. In the same lens, the surface with the smaller surface number is the object side of the lens, and the surface with the larger surface number is the image side of the lens. For example, surface numbers 1 and 2 correspond to the object side S1 and image side S2 of the first lens L1, respectively. The radii in Table 13 are the radii of curvature of the corresponding object side or image side at the optical axis. The first value in the "thickness" parameter column of the first lens L1 is the thickness of the lens along the optical axis (center thickness), and the second value is the distance along the optical axis from the image side of this lens to the object side of the next lens. The value of the aperture stop in the "Thickness" parameter column represents the distance from the aperture stop to the vertex of the object side of the next lens (the vertex refers to the intersection of the lens and the optical axis) along the optical axis. By default, the direction from the object side of the first lens to the image side of the last lens is the positive direction of the optical axis. When this value is negative, it indicates that the aperture stop is located to the right of the vertex of the object side of the next lens. If the aperture stop thickness is positive, the aperture stop is to the left of the vertex of the object side of the next lens. Table 14 shows the relevant parameters of the aspherical surfaces of each lens in Table 13, where k is the conic coefficient and Ai is the i-th order aspherical coefficient.

[0144] Table 13

[0145]

[0146] Table 14

[0147]

[0148] Further, please refer to Figure 14 (A), Figure 14 (A) is a graph showing the spherical aberration curves of light rays at wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm in the seventh embodiment. The horizontal axis along the X-axis represents the focal shift, and the vertical axis along the Y-axis represents the normalized field of view. Figure 14 (A) It can be seen that the spherical aberration values ​​corresponding to wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm are better, indicating that the imaging quality of the optical system 100 in this embodiment is better.

[0149] Please see Figure 14 (B) Figure 14 (B) is the astigmatism diagram of the light at a wavelength of 555 nm in the seventh embodiment. The horizontal axis along the X-axis represents the focal shift, and the vertical axis along the Y-axis represents the image height. Figure 14 (B) It can be seen that the astigmatism of the optical system 100 is well compensated.

[0150] Please see Figure 14 (C), Figure 14 (C) is the distortion curve at a wavelength of 555nm in the seventh embodiment. The horizontal axis along the X-axis represents distortion, and the vertical axis along the Y-axis represents image height. Figure 14 (C) It can be seen that the distortion of the optical system 100 has been well corrected.

[0151] Furthermore, the data values ​​in the various relations satisfied by the optical system 100 in the above seven embodiments are shown in Table 15 below.

[0152] Table 15

[0153]

[0154] According to a second aspect of this application, a camera module 200 is provided, which includes the aforementioned optical system 100 and an image sensor 210. The image sensor 210 is disposed on the image side of the optical system 100, which will not be described in detail here. It is understood that the camera module 200 having the aforementioned optical system 100 also possesses all the technical effects of the aforementioned optical system 100. Through the aforementioned eight-lens structure and the refractive power configuration of each lens in the optical system 100, the light throughput of the optical system 100 can be increased, improving the imaging quality under low-light shooting conditions, making it suitable for shooting in low-light environments such as night scenes, rainy days, and starry skies. When the above relationships are satisfied, by reasonably adjusting the focal length, thickness, and other parameters of each lens in the optical system 100, it is beneficial to correct the advanced aberrations of the optical system 100, achieving high-pixel and high-definition imaging quality, and realizing the ultra-thin characteristics of the optical system 100. Since the above technical effects have been described in detail in the embodiments of the optical system 100, they will not be repeated here.

[0155] According to a third aspect of this application, an electronic device 30 is provided, comprising a housing 310 and the aforementioned camera module 200. The electronic device 30 can be a mobile phone, computer, tablet, monitor, etc. It is understood that the electronic device 30 with the aforementioned camera module 200 also possesses all the technical effects of the aforementioned optical system 100. Through the aforementioned eight-lens structure and the refractive power configuration of each lens in the optical system 100, the light throughput of the optical system 100 can be increased, improving the imaging quality under low-light shooting conditions, making it suitable for shooting in low-light environments such as night scenes, rainy days, and starry skies. When the above relationships are satisfied, by reasonably adjusting the focal length, thickness, and other parameters of each lens in the optical system 100, it is beneficial to correct the advanced aberrations of the optical system 100, achieving high-pixel and high-definition imaging quality, and realizing the ultra-thin characteristics of the optical system 100. Since the above technical effects have been described in detail in the embodiments of the optical system 100, they will not be repeated here.

[0156] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0157] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of protection of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the appended claims.

Claims

1. An optical system, characterized in that, The optical system comprises eight lenses with optical refractive power, arranged sequentially from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. The first lens has positive refractive power, and the object side of the first lens is convex at the optical axis, while the image side of the first lens is concave at the optical axis. The second lens has negative refractive power, and the object side of the second lens is convex at the optical axis, while the image side of the second lens is concave at the optical axis. The third lens has refractive power; The fourth lens has refractive power; The fifth lens has refractive power; The sixth lens has refractive power, and the object side of the sixth lens is concave at the optical axis, while the image side of the sixth lens is convex at the optical axis. The seventh lens has refractive power, the object side of the seventh lens is convex at the optical axis, and the image side of the seventh lens is concave at the optical axis; The eighth lens has negative refractive power, and the object side of the eighth lens is convex at the optical axis; The optical system satisfies the following relationship: |f12 / f78|<2; 2.38≤|f2 / f|≤2.71; 1<|f / f8|<1.25; 1<(R15+R16) / (R15-R16)≤2.2; Wherein, f12 is the combined focal length of the first lens and the second lens; f78 is the combined focal length of the seventh lens and the eighth lens; f is the effective focal length of the optical system; f2 is the effective focal length of the second lens; f8 is the effective focal length of the eighth lens; R15 is the radius of curvature of the object side of the eighth lens at the optical axis; and R16 is the radius of curvature of the image side of the eighth lens at the optical axis.

2. The optical system according to claim 1, characterized in that, The optical system satisfies the following relationship: 1.65 ≤ f / EPD < 1.7; Where f is the effective focal length of the optical system; EPD is the entrance pupil diameter of the optical system.

3. The optical system according to claim 1, characterized in that, The optical system satisfies the following relationship: f tan(HFOV)>5.15mm; Where f is the effective focal length of the optical system; HFOV is the half field of view of the optical system.

4. The optical system according to claim 1, characterized in that, The optical system satisfies the following relationship: 1.62 ≤ TTL / Imgh < 1.7 Where TTL is the total optical length of the optical system; ImgH is half the image height corresponding to the maximum field of view of the optical system.

5. The optical system according to claim 1, characterized in that, The optical system satisfies the following relationship: 0.7mm <CT7<0.95mm; Wherein, CT7 is the center thickness of the seventh lens along the optical axis.

6. The optical system according to claim 1, characterized in that, The optical system satisfies the following relationship: 1.91≤f1 / R1≤2.14; Where f1 is the effective focal length of the first lens; R1 is the radius of curvature of the object side of the first lens at the optical axis.

7. A camera module, characterized in that, It includes the optical system and image sensor as described in any one of claims 1-6, wherein the image sensor is disposed on the image side of the optical system.

8. An electronic device, characterized in that, It includes a housing and the camera module as described in claim 7, wherein the camera module is disposed within the housing.

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