Optical system, camera module and electronic device

Abstract

The application discloses an optical system, a camera module and an electronic device. The optical system comprises 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 in sequence. The first lens to the sixth lens form a first lens group, the seventh lens to the eighth lens form a second lens group, the second lens group is fixed relative to an imaging surface of the optical system, and the first lens group is movable relative to the second lens group along an optical axis. The optical system, the camera module and the electronic device disclosed by the application can realize clear imaging on the basis of considering miniaturization design, so as to improve the imaging effect during close-up shooting.

Description

Technical Field

[0001] This application relates to the field of optical imaging technology, and in particular to an optical system, camera module and electronic device. Background Technology

[0002] In recent years, various electronic devices equipped with camera lenses (including digital cameras, smartphones, laptops, tablets, and other portable information terminals) have been rapidly developing and becoming widespread. Internal focusing optical systems, typically used in cameras, are now also being applied to electronic devices due to their high-quality imaging and high zoom ratios. However, with the miniaturization and thinning of electronic devices, the size requirements for camera lenses are also increasing. Therefore, how to balance miniaturization requirements with achieving internal focusing to address the poor image quality in close-up shots is a pressing issue that needs to be resolved. Summary of the Invention

[0003] This application discloses an optical system, camera module, and electronic device that can reduce the impact on focusing speed while maintaining a miniaturized design.

[0004] To achieve the above objectives, in a first aspect, this application discloses an optical system comprising eight lenses with refractive power, arranged sequentially along the object-side to image-side direction of the optical axis:

[0005] A first lens group, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged sequentially along the object-side to image-side direction of the optical axis. The first lens has refractive power, its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. The second lens has refractive power, its object-side surface is convex near the optical axis. The third lens has refractive power, its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. The fourth lens has positive refractive power, its object-side surface is convex near the optical axis. The fifth lens has negative refractive power, its image-side surface is concave near the optical axis. The sixth lens has positive refractive power, its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis.

[0006] The second lens group includes a seventh lens and an eighth lens arranged sequentially along the object-side to image-side direction of the optical axis. The seventh lens has refractive power, and the eighth lens has negative refractive power. The object-side and image-side surfaces of the eighth lens are concave near the optical axis.

[0007] The optical system satisfies the following relationship: 1.25 <TTL / ImgH<1.65;

[0008] Wherein, the second lens group is fixed relative to the imaging surface of the optical system, the first lens group can move relative to the second lens group along the optical axis, TTL is the distance from the object side of the first lens to the imaging surface of the optical system on the optical axis, and ImgH is half of the image height corresponding to the maximum field of view of the optical system.

[0009] Secondly, this application discloses a camera module, which includes an image sensor and an optical system as described in the first aspect above, wherein the image sensor is disposed on the image side of the optical system. A camera module with the aforementioned optical system can achieve internal focusing to improve image quality during close-up shots while maintaining a miniaturized design.

[0010] Thirdly, this application discloses an electronic device comprising a housing and a camera module as described in the second aspect above, the camera module being disposed within the housing. The electronic device having the aforementioned camera module can achieve internal focusing to improve image quality during close-up shots while maintaining a miniaturized design.

[0011] In the optical system provided by this application, in order to achieve miniaturization design and, on the basis of considering miniaturization design, achieve internal focusing to improve the imaging quality during close-up shooting, the eight lenses are divided into a first lens group and a second lens group, and the second lens group is fixed relative to the imaging surface of the optical system, while the first lens group can move along the optical axis relative to the second lens group. As a result, the optical system can have an internal focusing function. At the same time, by only using the method of moving the first lens group, the burden on the motor of the optical system can also be reduced, achieving the effect of rapid internal focusing of the optical system using a motor with lower power. In addition, by using eight lenses with refractive power, the pressure of light refraction can be evenly distributed to each lens, reducing the task amount of a single lens for refracting light and avoiding excessive bending of the lens and increasing the tolerance sensitivity. Specifically, the first lens has refractive power. With the design that its object side is convex near the optical axis and its image side is concave near the optical axis, it is beneficial for light to enter the first lens better. The second lens has refractive power, and the object side of the second lens is convex near the optical axis, which can help correct the aberration generated by the first lens and improve the imaging effect of the optical system. The third lens has refractive power, and its object side and image side are convex and concave respectively near the optical axis, which is beneficial for reducing the incident angle of light entering the optical system and enabling as much light as possible to enter the optical system. The fourth lens has positive refractive power, and the design that its object side is convex near the optical axis can help correct the aberration generated by the previous lenses (the first lens to the third lens) and contribute to improving the imaging effect of the optical system. The fifth lens has negative refractive power, and its image side is concave near the optical axis, and the sixth lens has positive refractive power, and its object side and image side are convex and concave respectively near the optical axis. This can reduce the incident angle of light entering the optical system, so that more light can enter the optical system. The seventh lens has positive refractive power, which is beneficial for correcting the spherical aberration, coma aberration and distortion generated by the first lens group and further improving the imaging quality of the optical system. The eighth lens has negative refractive power, and its object side is concave near the optical axis, which is convenient for correcting chromatic aberration and thus improving the imaging quality of the optical system.

[0012] In addition, when the optical system satisfies the relational expression: 1.25 < TTL / ImgH < 1.65, it can achieve miniaturization design while enabling the optical system to have a good imaging effect. In addition, it can also enable the optical system to have sufficient structural layout space. Brief Description of the Drawings

[0013] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1A This is a schematic diagram of the optical system disclosed in the first embodiment of this application in the telephoto state (optical path not shown);

[0015] Figure 1B These are the astigmatism curve (mm) and distortion curve (%) of the optical system disclosed in the first embodiment of this application in the telephoto state;

[0016] Figure 2A This is a schematic diagram of the optical system disclosed in the first embodiment of this application in a near-focus state (optical path not shown);

[0017] Figure 2B These are the astigmatism curve (mm) and distortion curve (%) of the optical system disclosed in the first embodiment of this application in a near-focus state;

[0018] Figure 3A This is a schematic diagram of the optical system disclosed in the second embodiment of this application in the telephoto state;

[0019] Figure 3B These are the astigmatism curve (mm) and distortion curve (%) of the optical system disclosed in the second embodiment of this application in the telephoto state;

[0020] Figure 3C These are the astigmatism curve (mm) and distortion curve (%) of the optical system disclosed in the second embodiment of this application in a near-focus state;

[0021] Figure 4A This is a schematic diagram of the optical system disclosed in the third embodiment of this application in the telephoto state;

[0022] Figure 4B These are the astigmatism curve (mm) and distortion curve (%) of the optical system disclosed in the third embodiment of this application in the telephoto state;

[0023] Figure 4C These are the astigmatism curve (mm) and distortion curve (%) of the optical system disclosed in the third embodiment of this application in a near-focus state;

[0024] Figure 5A This is a schematic diagram of the optical system disclosed in the fourth embodiment of this application in the telephoto state;

[0025] Figure 5BThese are the astigmatism curve (mm) and distortion curve (%) of the optical system disclosed in the fourth embodiment of this application in the telephoto state;

[0026] Figure 5C These are the astigmatism curve (mm) and distortion curve (%) of the optical system disclosed in the fourth embodiment of this application in a near-focus state;

[0027] Figure 6A This is a schematic diagram of the optical system disclosed in the fifth embodiment of this application in the telephoto state;

[0028] Figure 6B These are the astigmatism curve (mm) and distortion curve (%) of the optical system disclosed in the fifth embodiment of this application in the telephoto state;

[0029] Figure 6C These are the astigmatism curve (mm) and distortion curve (%) of the optical system disclosed in the fifth embodiment of this application in a near-focus state;

[0030] Figure 7A This is a schematic diagram of the optical system disclosed in the sixth embodiment of this application in the telephoto state;

[0031] Figure 7B These are the astigmatism curve (mm) and distortion curve (%) of the optical system disclosed in the sixth embodiment of this application in the telephoto state;

[0032] Figure 7C These are the astigmatism curve (mm) and distortion curve (%) of the optical system disclosed in the sixth embodiment of this application in a near-focus state;

[0033] Figure 8A This is a schematic diagram of the optical system disclosed in the seventh embodiment of this application in the telephoto state;

[0034] Figure 8B These are the astigmatism curve (mm) and distortion curve (%) of the optical system disclosed in the seventh embodiment of this application in the telephoto state;

[0035] Figure 8C These are the astigmatism curve (mm) and distortion curve (%) of the optical system disclosed in the seventh embodiment of this application in a near-focus state;

[0036] Figure 9A This is a schematic diagram of the optical system disclosed in the eighth embodiment of this application in the telephoto state;

[0037] Figure 9B These are the astigmatism curve (mm) and distortion curve (%) of the optical system disclosed in the eighth embodiment of this application in the telephoto state;

[0038] Figure 9CThese are the astigmatism curve (mm) and distortion curve (%) of the optical system disclosed in the eighth embodiment of this application in a near-focus state;

[0039] Figure 10 This is a schematic diagram of the camera module disclosed in this application;

[0040] Figure 11 This is a schematic diagram of the structure of the electronic device disclosed in this application. Detailed Implementation

[0041] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0042] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0043] The technical solution of this application will be further described below with reference to the embodiments and accompanying drawings.

[0044] Please refer to the following: Figure 1A , Figure 1B as well as Figure 2A According to a first aspect of this application, an optical system 100 is disclosed. The optical system 100 includes a first lens group G1 and a second lens group G2 arranged sequentially along the optical axis from the object side to the image side. The first lens group G1 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6 arranged sequentially along the optical axis from the object side to the image side. The second lens group G2 includes a seventh lens L7 and an eighth lens L8 arranged sequentially along the optical axis from the object side to the image side. The second lens group G2 is fixed relative to the imaging plane IMG of the optical system 100, while the first lens group G1 is movable relative to the second lens group G2 along the optical axis. This allows the optical system 100 to have continuous internal focusing capabilities, thereby improving image quality during close-up shots. Furthermore, by using only the first lens group G1 for movement, the load on the motor of the optical system 100 can be further reduced, enabling fast internal focusing of the optical system 100 with a lower-power motor.

[0045] Among them, the first lens L1 has positive or negative refractive power, the second lens L2 has positive or negative refractive power, the third lens L3 has positive or negative refractive power, the fourth lens L4 has positive refractive power, the fifth lens L5 has negative refractive power, the sixth lens L6 has positive refractive power, the seventh lens L7 has positive or negative refractive power, and the eighth lens L8 has negative refractive power. During imaging, light rays enter 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 sequentially from the object side, and finally form an image on the imaging plane IMG of the optical system 100.

[0046] Furthermore, the object-side surface S1 of the first lens L1 is convex near the optical axis, and the image-side surface S2 of the first lens L1 may be concave near the optical axis. The object-side surface S3 of the second lens L2 is convex near the optical axis, and the image-side surface S4 of the second lens L2 is either concave or convex near the optical axis; the object-side surface S5 of the third lens L3 is convex near the optical axis, and the image-side surface S6 of the third lens L3 is concave near the optical axis; the object-side surface S7 of the fourth lens L4 is convex near the optical axis, and the image-side surface S8 of the fourth lens L4 is either concave or convex near the optical axis; the object-side surface S9 of the fifth lens L5 is either convex or concave near the optical axis, and the image-side surface S10 of the fifth lens L5 is concave near the optical axis; the object-side surface S11 of the sixth lens L6 is convex near the optical axis, and the image-side surface S12 of the sixth lens L6 is concave near the optical axis. The object-side surface S13 of the seventh lens L7 is either convex or concave near the optical axis, and the image-side surface S14 of the seventh lens L7 is either convex or concave near the optical axis. The object-side surface S15 and the image-side surface of the eighth lens L8 are both concave near the optical axis.

[0047] By designing the refractive power and surface shape of the eight lenses, specifically, the first lens L1 has refractive power, and its object-side surface S1 is convex near the optical axis, while its image-side surface S2 is concave near the optical axis, which facilitates the convergence of incident light within the field of view; the second lens L2 has refractive power, and its object-side surface S3 is convex near the optical axis, which helps correct the aberrations generated by the first lens L1; the third lens L3 has refractive power, and its object-side and image-side surfaces are convex and concave near the optical axis, respectively, which helps reduce the amount of light entering the optical system 100 from the front lens. This reduces the incident angle of light rays; the fourth lens L4 has positive refractive power, and its object-side surface is convex near the optical axis, which helps correct aberrations generated by the preceding lenses (first lens L1 to third lens L3), thus improving the imaging effect of the optical system; the fifth lens L5 has negative refractive power, and its image-side surface is concave near the optical axis; and the sixth lens L6 has positive refractive power, and its object-side surface S11 and image-side surface S12 are convex and concave near the optical axis, respectively, which reduces the angle of light rays incident into the optical system 100, allowing more light rays to enter the optical system 100. The seventh lens L7 has positive refractive power, which helps correct spherical aberration, coma, and distortion generated by the first lens group G1, further improving the imaging quality of the optical system 100. The eighth lens L8 has negative refractive power, and its object-side surface is concave near the optical axis, which effectively corrects aberrations and controls the exit angle of light rays, further improving the imaging quality of the optical system 100. Furthermore, among the eight lenses of the optical system 100, several lenses employ a concave-convex lens design, which effectively reduces the overall length of the optical system 100 and facilitates its miniaturization. It is understood that this application only provides preferred solutions regarding the refractive power and surface design of each lens in the optical system 100. In other embodiments, the surface design of the optical system 100 may also employ other solutions, which are not all listed here due to space limitations; any other combination is also feasible.

[0048] In some embodiments, the optical system 100 can be applied to electronic devices such as smartphones and smart tablets. Therefore, the materials 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 can be selected as plastics, so as to make the optical system 100 lighter while being easier to process the complex surface of the lens. It can be understood that, in other embodiments, when the optical system 100 is applied to electronic devices such as vehicle-mounted devices and dash cams, or is used as a camera on the vehicle body of a car, 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 also be glass lenses, so as to have good optical effects while reducing the temperature sensitivity of the optical system 100.

[0049] In some embodiments, the optical system 100 further includes an aperture stop STO, and the aperture stop STO can be an aperture stop and / or a field stop, which can be disposed between the image side S2 of the first lens L1 and the object side S3 of the second lens L2. It can be understood that, in other embodiments, the aperture stop STO can also be disposed between other two lenses. For example, the aperture stop STO can also be disposed between the fourth lens L4 and the fifth lens L5, or can also be disposed between the second lens L2 and the third lens L3. The specific setting can be adjusted according to the actual situation, and no specific limitation is made in this embodiment.

[0050] In some embodiments, the optical system 100 further includes a filter IR, and the filter IR is disposed in the second lens group G2 and between the eighth lens L8 and the imaging surface IMG of the optical system 100. Optionally, the filter IR can be an infrared cut-off filter. By selecting an infrared cut-off filter, infrared light can be filtered out, the imaging quality can be improved, and the imaging can be more in line with the visual experience of the human eye. It can be understood that the filter IR can be made of optical glass coating, or can be made of colored glass, or other materials of the filter IR, which can be selected according to actual needs, and no specific limitation is made in this embodiment.

[0051] In some embodiments, the optical system 100 satisfies the following relationship: 74deg < FOV < 90deg; where FOV is the maximum field angle of the optical system 100. When the optical system 100 satisfies the relationship 74deg < FOV < 90deg, the optical system 100 can achieve the functions of a large field of view and close-up shooting.

[0052] In some embodiments, the optical system 100 satisfies the relationship: 1.3 < FNO < 2.3. In this way, the optical system 100 can have the characteristics of a large aperture.

[0053] In some embodiments, the optical system 100 further satisfies the following relationship: 1.4 < Bz2 / Bz1 < 3.3; where Bz2 is the distance on the optical axis from the image side surface S12 of the sixth lens L6 to the object side surface S13 of the seventh lens L7 when the optical system 100 is in the near-focus state, and Bz1 is the distance on the optical axis from the image side surface S12 of the sixth lens L6 to the object side surface S13 of the seventh lens L7 when the optical system 100 is in the far-focus state. By moving the first lens group G1, it is possible to achieve internal focusing imaging while correcting the image quality performance at different object distances. At the same time, when the optical system 100 satisfies the relationship 1.4 < Bz2 / Bz1 < 3.3, the movement amount of the first lens group G1 from the far focus to the near focus can be effectively controlled, thereby reducing the movement stroke of the first lens group G1, effectively ensuring the movement driving amount of the motor, and reducing the impact on the focusing speed. Optionally, the relationship can further satisfy 1.5 < Bz2 / Bz1 < 3.2. In this way, the movement stroke of the first lens group G1 is reasonable, thus further reducing the impact on the focusing speed.

[0054] In some embodiments, the optical system 100 satisfies the following relationship: 0.81 < DLmax / TTL < 0.95. Where DLmax is the maximum distance on the optical axis from the object side surface S1 of the first lens L1 to the image side surface S16 of the eighth lens L8, and TTL is the distance on the optical axis from the object side surface S1 of the first lens L1 to the imaging surface IMG of the optical system 100 (i.e., the total length of the optical system 100). When the optical system 100 satisfies the relationship 0.81 < DLmax / TTL < 0.95, it is possible to reduce the space of the lens part of the optical system 100 on the basis of realizing the miniaturized design of the optical system 100, leaving enough space for the first lens group G1 to focus under different working object distance conditions (i.e., far focus and near focus). Thus, the optical system 100 can save costs and achieve a compact layout under the condition of realizing internal focusing. Optionally, the relationship can further be 0.81 < DLmax / TTL < 0.93, thereby further leaving enough space for the first lens group G1 to focus under different working object distance conditions, and further facilitating the flexible layout of the first lens group and the second lens group of the optical system 100.

[0055] In some embodiments, the optical system 100 satisfies the following relationship: 1.2 < TTL / f < 1.45. Where f is the focal length of the optical system 100. In this way, while the optical system 100 can be further miniaturized, a better close-up effect can also be achieved. Optionally, the relationship can further be 1.25 < TTL / f < 1.4, and the close-up effect is better.

[0056] In some embodiments, the optical system 100 satisfies the relation: 1.25 < TTL / ImgH < 1.65, where ImgH is half of the image height corresponding to the maximum field angle of the optical system 100. By defining the ratio of the total length of the optical system 100 to half of the image height corresponding to the maximum field angle of the optical system 100, while achieving miniaturized design, the optical system 100 can have good imaging effects. In addition, it can also enable the optical system 100 to have sufficient structural layout space. Optionally, the relation can be further 1.3 < TTL / ImgH < 1.6, so that the structural layout of the optical system 100 is more convenient.

[0057] In some embodiments, the optical system 100 satisfies the following relation: 1.8 < TD123456 / TD78 < 3.8, where TD123 is the distance on the optical axis from the object side S1 of the first lens L1 to the image side S12 of the sixth lens L6, and TD78 is the distance on the optical axis from the object side of the seventh lens to the image side S16 of the eighth lens L8. When the optical system 100 satisfies this relation, the overall thickness of the first lens group and the second lens group can be effectively controlled, which is conducive to controlling the total length of the optical system 100, and thus conducive to the miniaturized design of the optical system 100. Optionally, the relation can be further satisfied as 1.9 < TD123456 / TD78 < 3.6, which is further conducive to the miniaturized design of the optical system 1000.

[0058] In some embodiments, the optical system 100 satisfies the following relation: 1.05 < TTL / (TD123456 + TD78) < 1.45. In this way, when the optical system 100 switches between the near-focus state and the far-focus state, it can switch within the total length range of the optical system 100, and the difference in the total length of the optical system 100 is not large, so that the moving distance of the first lens group G1 can be effectively controlled to achieve internal focusing. Optionally, the relation can be further satisfied as 1.1 < TTL / (TD123456 + TD78) < 1.45, so as to further control the moving distance of the first lens group G1.

[0059] In some embodiments, the optical system 100 satisfies the following relation: 2.7 < ImgH / SD11 < 4.5. Where SD11 is the maximum effective semi-aperture of the object side S1 of the first lens L1. When the optical system 100 satisfies this relation, the ratio of the imaging surface IMG of the optical system 100 to the head aperture of the optical system 100 can be reasonably controlled to achieve light convergence within the field of view. At the same time, the maximum effective semi-aperture of the object side of the first lens L1 can be made smaller to achieve a small-head design. Optionally, the relation can be further satisfied as 2.8 < ImgH / SD11 < 4.2, so that while achieving large-image-plane imaging, the head of the optical system 100 is smaller.

[0060] In some embodiments, the optical system 100 satisfies the following relationship: 1.65 < ImgH / SD62 < 2.8. Here, SD62 is the maximum effective semi-aperture of the image side S12 of the sixth lens L6. When the optical system 100 satisfies this relationship, the ratio of the maximum effective semi-aperture of the sixth lens L6 to the imaging surface IMG of the optical system 100 can be made reasonable, so that the light passing through the sixth lens L6 can enter the second lens group G2 smoothly, which is beneficial to improving the imaging effect of the optical system 100. In addition, it can also make the maximum effective semi-aperture of the image side S12 of the sixth lens L6 match the size of the imaging surface of the optical system 100, which is more conducive to the entry of light. Optionally, this relationship can further satisfy: 1.7 < ImgH / SD62 < 2.6, so that the maximum effective semi-aperture of the image side S12 of the sixth lens L6 and the size of the imaging surface of the optical system 100 are more adaptable.

[0061] In some embodiments, the optical system 100 satisfies the following relationship: 1 < SD41 / SD32 < 1.1. Here, SD32 is the maximum effective semi-aperture of the image side of the third lens L3, and SD41 is the maximum effective semi-aperture of the object side S7 of the fourth lens L4. When the optical system 100 satisfies the relationship 0.9 < SD41 / SD32 < 1.2, that is, the maximum effective semi-aperture of the object side S7 of the fourth lens L4 is greater than or slightly greater than the maximum effective semi-aperture of the image side S6 of the third lens L3, so that the difference between the maximum effective semi-apertures of the image side S6 of the third lens L3 and the object side S7 of the fourth lens L4 can be made small, thereby controlling the step difference formed between the two, and making the transition of light between the third lens L3 and the fourth lens L4 smoother.

[0062] In some embodiments, the optical system 100 satisfies the following relationship: 1.7 < SD11 / CT1 < 9. Here, SD11 is the maximum effective semi-aperture of the object side S1 of the first lens L1, and CT1 is the thickness of the first lens L1 on the optical axis. By limiting the ratio of the maximum effective semi-aperture of the object side S1 of the first lens L1 to the central thickness of the first lens L1, the surface shape of the first lens L1 can be effectively controlled, and at the same time, the central thickness of the first lens L1 can be made reasonable, which is beneficial to the incidence and convergence of light within the field of view, and is also beneficial to the processing and forming of the first lens L1, making the thickness design of the first lens L1 reasonable and reducing the processing difficulty of the first lens L1. Optionally, this relationship can further satisfy 1.7 < SD11 / CT1 < 8.5, which is more beneficial to the processing and forming of the first lens L1.

[0063] In some embodiments, the optical system 100 satisfies the following relationship: 1.1 < ∑CT / CT123456 < 1.6. Here, CT123456 is the sum of the thicknesses of each of the first lens L1 to the sixth lens L6 on the optical axis (i.e., the overall thickness of the first lens group), and ∑CT is the sum of the thicknesses 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 on the optical axis. That is, the total central thickness of the eight lenses from the first lens L1 to the eighth lens L8. By defining the ratio of the overall thickness of the first lens group to the overall thicknesses of the first lens group and the second lens group, the overall thickness of the first lens group can be reasonably controlled, so that the overall thicknesses of the first lens group and the second lens group do not differ too much. Thus, while achieving miniaturization of the optical system 100, it is also convenient for the processing and assembly of the first lens group and the second lens group. Optionally, this relationship can further satisfy 1.2 < ∑CT / CT123456 < 1.5. In this way, the overall thickness of the first lens group G1 can be better controlled, which is beneficial to the miniaturization design of the optical system 100.

[0064] In some embodiments, the optical system 100 satisfies the following relationship: 2.6 < ∑CT / CT78 < 5.5. Here, CT78 is the sum of the thicknesses of the seventh lens L7 and the eighth lens L8 on the optical axis (i.e., the overall thickness of the second lens group). In this way, the overall thickness of the second lens group is appropriate, so that the overall thickness of the second lens group can be reasonably controlled. Thus, while achieving miniaturization of the optical system 100, it is also convenient for the processing and assembly of the first lens group and the second lens group. Optionally, this relationship can further satisfy 2.8 < ∑CT / CT78 < 5.1. In this way, the overall thickness of the second lens group can be better controlled, which is beneficial to the miniaturization design of the optical system 100.

[0065] In some embodiments, the optical system 100 satisfies the following relationship: 0.25 < CT1 / CT2 < 4.5. Here, CT2 is the thickness of the second lens L2 on the optical axis. By defining the ratio of the thickness of the first lens L1 on the optical axis to the thickness of the second lens L2 on the optical axis, the thicknesses of the first lens L1 and the second lens L2 can be reasonably controlled, achieving the miniaturization design of the optical system 100, and at the same time being beneficial to reducing the sensitivity of the optical system 100. Optionally, this relationship can further satisfy 0.3 < CT1 / CT2 < 4.1, so that the first lens has a greater thickness and the sensitivity of the optical system 100 is lower.

[0066] In some embodiments, the optical system 100 satisfies the following relationship: 0.4 < CT2 / CT3 < 2.8. Here, CT3 is the thickness of the third lens L3 on the optical axis. When this relationship is satisfied, the thicknesses of the third lens L3 and the second lens L2 can be effectively controlled, achieving a miniaturized design of the optical system 100. Meanwhile, it is beneficial to reduce the sensitivity of the optical system 100. Optionally, this relationship can further satisfy 0.45 < CT2 / CT3 < 2.6, so that the difference in their thicknesses is not too large, which is further beneficial to reducing the sensitivity of the optical system 100.

[0067] In some embodiments, the optical system 100 satisfies the following relationship: 1.5 < CT4 / CT5 < 2.6. Here, CT4 is the thickness of the fourth lens L4 on the optical axis, and CT5 is the thickness of the fifth lens L5 on the optical axis. When this relationship is satisfied, the thicknesses of the fifth lens L5 and the fourth lens L4 can be effectively controlled, achieving a miniaturized design of the optical system 100. Meanwhile, it is beneficial to reduce the sensitivity of the optical system 100. Optionally, this relationship can further satisfy 1.6 < CT4 / CT5 < 2.5, so that the fourth lens L4 has a greater thickness and the sensitivity of the optical system 100 is lower.

[0068] In some embodiments, the optical system 100 satisfies the following relationship: 0.8 < CT6 / CT4 < 1.83. Here, CT6 is the thickness of the sixth lens L6 on the optical axis. When this relationship is satisfied, the thicknesses of the fourth lens L4 and the sixth lens L6 can be effectively controlled, achieving a miniaturized design of the optical system 100. Meanwhile, it is beneficial to reduce the sensitivity of the optical system 100. Optionally, this relationship can further satisfy 0.85 < CT6 / CT4 < 1.8, making the difference in thickness between the fourth lens L4 and the sixth lens L6 not large, which is beneficial to reducing the sensitivity of the optical system 100.

[0069] In some embodiments, the optical system 100 satisfies the following relationship: 1.6 < CT6 / CT5 < 3.6. When this relationship is satisfied, the thicknesses of the fifth lens L5 and the sixth lens L6 can be effectively controlled, achieving a miniaturized design of the optical system 100. Meanwhile, it is beneficial to reduce the sensitivity of the optical system 100. Optionally, this relationship can further satisfy 1.6 < CT6 / CT5 < 3.5, so that the sixth lens L6 has a greater thickness and the sensitivity of the optical system 100 is lower.

[0070] In some embodiments, the optical system 100 satisfies the following relationship: 12 < ∑CT / CT5 < 16. When this relationship is satisfied, the thickness of the fifth lens L5 can be effectively distributed, enabling miniaturized design of the optical system 100, and at the same time facilitating reduction of the sensitivity of the optical system 100. Optionally, this relationship can further satisfy 13 < ∑CT / CT5 < 15, which is further conducive to controlling the thickness ratio of the fifth lens L5 in the overall lens thickness and reducing the sensitivity of the optical system 100.

[0071] In some embodiments, the optical system 100 satisfies the following relationship: 0.9 < CT4 / CT3 < 2.3. When this relationship is satisfied, the thicknesses of the fourth lens L4 and the third lens L3 can be effectively controlled, enabling miniaturized design of the optical system 100, and at the same time facilitating reduction of the sensitivity of the optical system 100. Optionally, this relationship can further satisfy 1 < CT4 / CT3 < 2.1, such that the thickness difference between the fourth lens L4 and the third lens L3 is not significant, which is conducive to reducing the sensitivity of the optical system 100.

[0072] In some embodiments, the optical system 100 satisfies the following relationship: 0.9 < AT78 / CT8 < 2.6. Here, AT78 is the distance on the optical axis from the image side surface S¹⁴ of the seventh lens L7 to the object side surface S¹⁵ of the eighth lens L8. When this relationship is satisfied, the ratio of the optical spacing between the seventh lens L7 and the eighth lens L8 to the thickness of the eighth lens L8 can be effectively controlled, enabling miniaturized design of the optical system 100, and at the same time facilitating reduction of the sensitivity of the optical system 100.

[0073] In some embodiments, the optical system 100 satisfies the following relationship: 0.9 < |f1 / f| < 7, where f1 is the focal length of the first lens L1 and f is the focal length of the optical system 100. By controlling the ratio of the focal length of the first lens L1 to the focal length of the optical system 100, a reasonable refractive power distribution for the first lens L1 can be achieved, which helps to reduce the overall spherical aberration, chromatic aberration, and distortion of the first lens group to a reasonable level, reduces the design difficulty of the subsequent lenses, and at the same time improves the overall resolving power of the optical system 100 and strengthens the peripheral aberration correction of the optical system 100. In addition, it is also conducive to size compression of the first lens group, thereby helping to form a small-sized optical system 100.

[0074] In some embodiments, the optical system 100 satisfies the following relationship: 1 < |f2 / f| < 2.2, where f2 is the focal length of the second lens L2. By controlling the ratio of the focal length of the second lens L2 to the focal length of the optical system 100, the second lens L2 can have a reasonable refractive power, which helps to reduce the overall spherical aberration, chromatic aberration, and distortion of the first lens group to a reasonable level, reduces the design difficulty of the subsequent lenses, and at the same time improves the overall resolving power of the optical system 100 and strengthens the peripheral aberration correction of the optical system 100. In addition, it is also beneficial to the size compression of the first lens group, thus contributing to the formation of a small-sized optical system 100.

[0075] In some embodiments, the optical system 100 satisfies the following relationship: 6 < |f3 / f| < 11, where f3 is the focal length of the third lens L3. By controlling the ratio of the focal length of the third lens L3 to the focal length of the optical system 100, the third lens L3 can have a reasonable refractive power, which helps to reduce the overall spherical aberration, chromatic aberration, and distortion of the first lens group to a reasonable level, reduces the design difficulty of the subsequent lenses, and at the same time improves the overall resolving power of the optical system 100 and strengthens the peripheral aberration correction of the optical system 100. In addition, it is also beneficial to the size compression of the first lens group, thus contributing to the formation of a small-sized optical system 100.

[0076] In some embodiments, the optical system 100 satisfies the following relationship: 2 < f4 / f < 3.8, where f4 is the focal length of the fourth lens L4. By controlling the ratio of the focal length of the fourth lens L4 to the focal length of the optical system 100, the fourth lens L4 can have a reasonable refractive power, which helps to reduce the overall spherical aberration, chromatic aberration, and distortion of the first lens group G1 to a reasonable level, reduces the design difficulty of the subsequent lenses, and at the same time improves the overall resolving power of the optical system 100 and strengthens the peripheral aberration correction of the optical system 100. In addition, it is also beneficial to the size compression of the first lens group G1, thus contributing to the formation of a small-sized optical system 100. Optionally, the relationship further satisfies 2.1 < f4 / f < 3.8, which can improve the imaging quality of the optical system 100 while achieving the miniaturized design of the optical system 100.

[0077] In some embodiments, the optical system 100 satisfies the following relationship: -7 < f5 / f < -1, where f5 is the focal length of the fifth lens L5. By controlling the ratio of the focal length of the fifth lens L5 to the focal length of the optical system 100, the fifth lens L5 can have a reasonable refractive power, which helps to reduce the overall spherical aberration, chromatic aberration, and distortion of the first lens group G1 to a reasonable level, reduces the design difficulty of the subsequent lenses, and at the same time improves the overall resolution of the optical system 100 and strengthens the peripheral aberration correction of the optical system 100. In addition, it is beneficial to compress the size of the first lens group G1, thereby helping to form a small-sized optical system 100. Optionally, the relationship further satisfies -7 < f5 / f < -1.2, which can improve the imaging quality of the optical system 100 while achieving the miniaturized design of the optical system 100.

[0078] In some embodiments, the optical system 100 satisfies the following relationship: 0.9 < f6 / f < 2.1, where f6 is the focal length of the sixth lens L6. By controlling the ratio of the focal length of the sixth lens L6 to the focal length of the optical system 100, the sixth lens L6 can have a reasonable refractive power, which helps to reduce the overall spherical aberration, chromatic aberration, and distortion of the first lens group G1 to a reasonable level, reduces the design difficulty of the subsequent lenses, and at the same time improves the overall resolution of the optical system 100 and strengthens the peripheral aberration correction of the optical system 100. In addition, it is beneficial to compress the size of the first lens group G1, thereby helping to form a small-sized optical system 100. Optionally, the relationship further satisfies 1 < f6 / f < 2.1, which can improve the imaging quality of the optical system 100 while achieving the miniaturized design of the optical system 100.

[0079] In some embodiments, the optical system 100 satisfies the following relationship: 1.1 < |f7 / f| < 20, where f7 is the focal length of the seventh lens L7. By controlling the ratio of the focal length of the seventh lens L7 to the focal length of the optical system 100, the seventh lens L7 can have a reasonable refractive power, which helps to reduce the overall spherical aberration, chromatic aberration, and distortion of the second lens group G2 to a reasonable level, reduces the design difficulty of the subsequent lenses, and at the same time improves the overall resolution of the optical system 100 and strengthens the peripheral aberration correction of the optical system 100. In addition, it is beneficial to compress the size of the second lens group G2, thereby helping to form a small-sized optical system 100.

[0080] In some embodiments, the optical system 100 satisfies the following relationship: -1.7 < f / f8 < -0.9, where f8 is the focal length of the eighth lens L8. By controlling the ratio of the focal length of the eighth lens L8 to the focal length of the optical system 100, a reasonable refractive power of the seventh lens L7 can be obtained, which helps to reduce the spherical aberration, chromatic aberration, and distortion of the second lens group G2 to a reasonable level, reduces the design difficulty of the subsequent lenses, improves the overall resolution of the optical system 100, and enhances the peripheral aberration correction of the optical system 100. In addition, it is beneficial to compress the size of the second lens group G2, thus contributing to the formation of a small-sized optical system 100. Optionally, the relationship further satisfies -1.7 < f / f8 < -1, which can improve the imaging quality of the optical system 100 while achieving the miniaturization design of the optical system 100.

[0081] In some embodiments, the optical system 100 satisfies the following relationship: 1.2 < f / R11 < 2.4; where R11 is the curvature radius of the object side surface S1 of the first lens L1 on the optical axis. When the optical system 100 satisfies this relationship, the surface shape complexity of the first lens L1 can be reduced, thereby effectively suppressing the increase of field curvature and distortion, and at the same time reducing the forming difficulty of the first lens L1.

[0082] In some embodiments, the optical system 100 satisfies the following relationship: 0.3 < f / R12 < 2.0; where R12 is the curvature radius of the image side surface S2 of the first lens L1 on the optical axis. When the optical system 100 satisfies this relationship, the surface shape complexity of the first lens L1 can be reduced, thereby effectively suppressing the increase of field curvature and distortion, and at the same time reducing the forming difficulty of the first lens L1.

[0083] In some embodiments, the optical system 100 satisfies the following relationship: 1.3 < f / R21 < 2.4, where R21 is the curvature radius of the object side surface S3 of the second lens L2 on the optical axis. When the optical system 100 satisfies this relationship, the surface shape complexity of the second lens L2 can be reduced, thereby effectively suppressing the increase of field curvature and distortion, and at the same time reducing the forming difficulty of the second lens L2.

[0084] In some embodiments, the optical system 100 satisfies the following relationship:.2 < |f / R22| < 3.4, where R22 is the curvature radius of the image side surface S4 of the second lens L2 on the optical axis. When the optical system 100 satisfies this relationship, the surface shape complexity of the second lens L2 can be reduced, thereby effectively suppressing the increase of field curvature and distortion, and at the same time reducing the forming difficulty of the second lens L2.

[0085] In some embodiments, the optical system 100 satisfies the following relationship: 0.7 < f / R31 < 2.8, where R31 is the radius of curvature of the object side surface of the third lens L3 at the optical axis. When the optical system 100 satisfies this relationship, the surface type complexity of the third lens L3 can be reduced, thereby effectively suppressing the increase of field curvature and distortion, and at the same time reducing the forming difficulty of the third lens L3. Optionally, this relationship can further satisfy 0.8 < f / R31 < 2.7, which is beneficial to the forming of the third lens L3.

[0086] In some embodiments, the optical system 100 satisfies the following relationship: 0.5 < f / R32 < 3.1, where R32 is the radius of curvature of the image side surface of the third lens L3 at the optical axis. When the optical system 100 satisfies this relationship, the surface type complexity of the third lens L3 can be reduced, thereby effectively suppressing the increase of field curvature and distortion, and at the same time reducing the forming difficulty of the third lens L3. Optionally, this relationship can further satisfy 0.6 < f / R32 < 3.1, which is beneficial to the forming of the third lens L3.

[0087] In some embodiments, the optical system 100 satisfies the following relationship: 1.1 < R41 / f < 8, where R41 is the radius of curvature of the object side surface S7 of the fourth lens L4 at the optical axis. When the optical system 100 satisfies this relationship, the surface type complexity of the fourth lens L4 can be reduced, thereby effectively suppressing the increase of field curvature and distortion, and at the same time reducing the forming difficulty of the fourth lens L4. Optionally, this relationship can further satisfy 1.2 < R41 / f < 8, which is beneficial to the forming of the fourth lens L4.

[0088] In some embodiments, the optical system 100 satisfies the following relationship: 1.6 < |R42 / f| < 6, where R42 is the radius of curvature of the image side surface S8 of the fourth lens L4 at the optical axis. When the optical system 100 satisfies this relationship, the surface type complexity of the fourth lens L4 can be reduced, thereby effectively suppressing the increase of field curvature and distortion, and at the same time reducing the forming difficulty of the fourth lens L4.

[0089] In some embodiments, the optical system 100 satisfies the following relationship: 1.2 < f / R51 < 13, where R51 is the radius of curvature of the object side surface S9 of the fifth lens L5 at the optical axis. When the optical system 100 satisfies this relationship, the surface type complexity of the fifth lens L5 can be reduced, thereby effectively suppressing the increase of field curvature and distortion, and at the same time reducing the forming difficulty of the fourth lens L4. Optionally, this relationship can further satisfy 1.2 < f / R51 < 13, which is beneficial to the forming of the fifth lens L5.

[0090] In some embodiments, the optical system 100 satisfies the following relationship: 0.8 < f / R52 < 1.4, where R52 is the radius of curvature of the image side surface S10 of the fifth lens L5 at the optical axis. When the optical system 100 satisfies this relationship, the surface type complexity of the fifth lens L5 can be reduced, thereby effectively suppressing the increase of field curvature and distortion, and at the same time reducing the forming difficulty of the fourth lens L4.

[0091] In some embodiments, the optical system 100 satisfies the following relationship: 1.6 < f / R61 < 2.2, where R61 is the radius of curvature of the object side surface S11 of the sixth lens L6 at the optical axis. When the optical system 100 satisfies this relationship, the surface type complexity of the sixth lens L6 can be reduced, thereby effectively suppressing the increase of field curvature and distortion, and at the same time reducing the forming difficulty of the sixth lens L6. In addition, the back focal length of the optical system 100 can be effectively controlled, avoiding the excessive total length of the optical system 100, which is beneficial to the miniaturized design of the optical system 100.

[0092] In some embodiments, the optical system 100 satisfies the following relationship: 0.8 < R62 / f < 5, where R62 is the radius of curvature of the image side surface S12 of the sixth lens L6 at the optical axis. When the optical system 100 satisfies this relationship, the surface type complexity of the sixth lens L6 can be reduced, thereby effectively suppressing the increase of field curvature and distortion, and at the same time reducing the forming difficulty of the sixth lens L6. Optionally, this relationship can further satisfy 0.9 < R62 / f < 5, which is beneficial to the forming of the sixth lens L6.

[0093] In some embodiments, the optical system 100 satisfies the following relationship: 0.1 < |f / R71| < 2.5, where R71 is the radius of curvature of the object side surface S13 of the seventh lens L7 at the optical axis. When the optical system 100 satisfies this relationship, the surface type complexity of the seventh lens L7 can be reduced, thereby effectively suppressing the increase of field curvature and distortion, and at the same time reducing the forming difficulty of the seventh lens L7. In addition, the back focal length of the optical system 100 can be effectively controlled, avoiding the excessive total length of the optical system 100, which is beneficial to the miniaturized design of the optical system 100.

[0094] In some embodiments, the optical system 100 satisfies the following relationship: 0.2 < |f / R72| < 3.5, where R72 is the radius of curvature of the image side surface S14 of the seventh lens L7 at the optical axis. When the optical system 100 satisfies this relationship, the surface type complexity of the seventh lens L7 can be reduced, thereby effectively suppressing the increase of field curvature and distortion, and at the same time reducing the forming difficulty of the seventh lens L7.

[0095] In some embodiments, the optical system 100 satisfies the following relationship: -1.5 < f / R81 < -0.5, where R81 is the radius of curvature of the object side surface S15 of the eighth lens L8 at the optical axis. When the optical system 100 satisfies this relationship, the surface shape complexity of the eighth lens L8 can be reduced, thereby effectively suppressing the increase of field curvature and distortion, and at the same time reducing the molding difficulty of the eighth lens L8. In addition, the back focal length of the optical system 100 can be effectively controlled, avoiding the excessive overall length of the optical system 100, which is beneficial to the miniaturization design of the optical system 100.

[0096] In some embodiments, the optical system 100 satisfies the following relationship: 1 < f / R82 < 2.5, where R82 is the radius of curvature of the image side surface S16 of the eighth lens L8 at the optical axis. When the optical system 100 satisfies this relationship, the surface shape complexity of the eighth lens L8 can be reduced, thereby effectively suppressing the increase of field curvature and distortion, and at the same time reducing the molding difficulty of the eighth lens L8.

[0097] In some embodiments, the optical system 100 satisfies the following relationship: 0.15 < R11 / R12 < 1.5. By limiting the ratio of the radius of curvature of the object side surface S1 of the first lens L1 and the radius of curvature of the image side surface S2 of the first lens L1 at the near optical axis, the surface shape bending of the first lens L1 can be reasonably controlled, thereby facilitating the processing of the first lens L1, being beneficial to improving the processing yield of the optical system 100, effectively controlling the surface shape of the first lens L1, and reducing the processing difficulty of the first lens L1. Optionally, this relationship can further satisfy: 0.16 < R11 / R12 < 1.4, thereby being able to further reduce the processing difficulty of the first lens L1.

[0098] In some embodiments, the optical system 100 satisfies the following relationship: 0.15 < |R21 / R22| < 1.6. By limiting the ratio of the radius of curvature of the object side surface S3 of the second lens L2 and the radius of curvature of the image side surface S4 of the second lens L2 at the near optical axis, the surface shape bending of the second lens L2 can be reasonably controlled, thereby facilitating the processing of the second lens L2, being beneficial to improving the processing yield of the optical system 100.

[0099] In some embodiments, the optical system 100 satisfies the following relationship: 0.7 < R32 / R31 < 1.6. By limiting the ratio of the radius of curvature of the object side surface and the radius of curvature of the image side surface of the third lens L3 at the near optical axis, the surface shape bending of the third lens L3 can be reasonably controlled, thereby facilitating the processing of the third lens L3, being beneficial to improving the processing yield of the optical system 100. Optionally, this relationship can further satisfy 0.8 < R32 / R31 < 1.5, which can effectively control the surface shape of the third lens L3 and reduce the processing difficulty of the third lens L3.

[0100] In some embodiments, the optical system 100 satisfies the following relationship: 0.2 < R42 / R41 < 4.5. By defining the ratio of the curvature radii of the object side surface S7 and the image side surface S8 of the fourth lens L4 near the optical axis, the surface curvature of the fourth lens L4 can be reasonably controlled, facilitating the processing of the fourth lens L4 and improving the processing yield of the optical system 100. Optionally, the relationship can further satisfy: 0.22 < R42 / R41 < 4, further facilitating the processing of the fourth lens L4.

[0101] In some embodiments, the optical system 100 satisfies the following relationship: 1.2 < R51 / R52 < 12. By defining the ratio of the curvature radii of the object side surface S9 and the image side surface S10 of the fifth lens L5 near the optical axis, the surface curvature of the fifth lens L5 can be reasonably controlled, facilitating the processing of the fifth lens L5 and improving the processing yield of the optical system 100.

[0102] In some embodiments, the optical system 100 satisfies the following relationship: 1.7 < R62 / R61 < 9. When this relationship is satisfied, the surface curvature of the sixth lens L6 can be reasonably controlled, facilitating the processing of the sixth lens L6 and improving the processing yield of the optical system 100.

[0103] In some embodiments, the optical system 100 satisfies the following relationship: -0.3 < R71 / R72 < 2.8. When the optical system 100 satisfies this relationship, the surface curvature of the seventh lens L7 can be controlled, reducing the forming difficulty of the seventh lens L7. In addition, the back focal length of the optical system 100 can be effectively controlled, avoiding excessive overall length of the optical system 100, which is beneficial to the miniaturized design of the optical system 100.

[0104] In some embodiments, the optical system 100 satisfies the following relationship: -3.5 < R81 / R82 < -1. When the optical system 100 satisfies this relationship, the surface curvature of the eighth lens L8 can be controlled, reducing the forming difficulty of the eighth lens L8.

[0105] In some embodiments, the optical system 100 satisfies the following relationship: 0.4 < R32 / R11 < 4. When this relationship is satisfied, the surface shapes of the first lens L1 and the third lens L3 are comparable, avoiding problems that the deviation between the two is too large and affecting the assembly of the first lens group. Optionally, the relationship can further satisfy 0.4 < R32 / R11 < 3.6, further facilitating the assembly of the first lens L1 and the third lens L3.

[0106] The optical system 100 of this embodiment will be described in detail below in combination with specific parameters.

[0107] First Embodiment

[0108] The structural schematic diagram of the optical system 100 disclosed in the first embodiment of this application is shown below. Figure 1A , Figure 2A As shown, the optical system 100 includes a first lens L1, an aperture stop STO, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a filter IR, arranged sequentially along the optical axis from the object side to the image side. The first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, and sixth lens L6 constitute a first lens group, and the seventh lens L7 and eighth lens L8 constitute a second lens group.

[0109] In this embodiment, the first lens L1 has negative refractive power, the second lens L2 has positive refractive power, the third lens L3 has negative refractive power, the fourth lens L4 has positive refractive power, the fifth lens L5 has negative refractive power, the sixth lens L6 has positive refractive power, the seventh lens L7 has positive refractive power, and the eighth lens L8 has negative refractive power.

[0110] In this embodiment, the object-side surface S1 and image-side surface 12 of the first lens L1 are convex and concave near the optical axis, respectively; the object-side surface S3 and image-side surface 22 of the second lens L2 are both convex near the optical axis; the object-side surface S5 and image-side surface S6 of the third lens L3 are convex and concave near the optical axis, respectively; the object-side surface S7 and image-side surface S8 of the fourth lens L4 are both convex near the optical axis; the object-side surface S9 and image-side surface S10 of the fifth lens L5 are both concave near the optical axis; the object-side surface S11 and image-side surface S12 of the sixth lens L6 are convex and concave near the optical axis, respectively; the object-side surface S13 and image-side surface of the seventh lens L7 are concave and convex near the optical axis, respectively; and the object-side surface S15 and image-side surface S16 of the eighth lens L8 are both concave near the optical axis.

[0111] Specifically, the parameters of the optical system 100 are given in Table 1 below. In this application, the focal length of the optical lens is f = 8.467 mm, the aperture number FNO = 1.64, and the maximum field of view (FOV) is 56.46 degrees. The elements along the optical axis of the optical system 100 from the object side to the image side are arranged sequentially according to the order of the elements in Table 1 from top to bottom. 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 the image side of the first lens L1, respectively. The Y-radius in Table 1 is the radius of curvature of the corresponding object side or image side at the optical axis. The first value in the "thickness" parameter column of the lens is the thickness of the lens on the optical axis, and the second value is the distance from the image side of the lens to the next surface on the optical axis. The value of the stop STO in the "Thickness" parameter column represents the distance on the optical axis from the stop STO to the vertex of the next surface (the vertex refers to the intersection of the surface and the optical axis). By default, the direction from the object side of the first lens L1 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 stop STO is set on the image side of the next surface vertex. If the stop STO thickness is positive, the stop STO is on the object side of the next surface vertex. It is understood that the units for the Y-radius, thickness, and focal length in Table 1 are all mm. Furthermore, the refractive index, Abbe number, etc., in Table 1 are obtained at a reference wavelength of 587.56 nm, and the focal length is obtained at a reference wavelength of 555 nm. Considering that the optical system 100 of this application can achieve internal focusing, it has a telephoto state and a near-focus state. Therefore, it has different object distances A in the telephoto state and the near-focus state. At the same time, the air gap T67 (i.e. B in Table 1) between the sixth lens L6 and the seventh lens L7 in the optical axis direction is different in the telephoto state and the near-focus state.

[0112] Based on this, this application also provides the values ​​of A, B, and TTL in telephoto and near-focus states, respectively. For example, in near-focus state, the object distance of the optical lens is A = 130mm, B = 1.289mm, and TTL = 11.745mm. In telephoto state, the object distance of the optical lens is infinite, B = 0.810mm, and TTL = 11.265mm.

[0113] In addition, in Tables 1 and 2 below, surface numbers 1 and 2 correspond to the object side S1 and image side S2 of the first lens L1, respectively; surface numbers 3 and 4 correspond to the object side S3 and image side S4 of the second lens L2, respectively; and so on. Surface numbers 15 and 16 correspond to the object side S15 and image side S16 of the eighth lens, respectively.

[0114] In the first embodiment, the object-side surface and image-side surface of any one of the first lens L1 to the eighth lens are aspherical surfaces, and the surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0115]

[0116] Where x is the distance vector from the vertex of the aspherical surface at a height h along the optical axis; c is the curvature of the aspherical surface at the optical axis, c = 1 / Y (i.e., the paraxial curvature c is the reciprocal of the radius of curvature Y in Table 1 below); K is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16 and A18 that can be used for surface numbers 1-16 in the first embodiment, and for surface numbers 11, 12, 13, 14, 15 and 16, the higher-order coefficient A20 is also given.

[0117] Table 1

[0118]

[0119] Table 2

[0120]

[0121]

[0122] Please see Figure 1B , Figure 2B (B) in the middle Figure 1B , Figure 2B (B) in the figure shows the light astigmatism diagram of the optical system 100 in the first embodiment at a wavelength of 555 nm. The horizontal axis along the X-axis represents the focal shift, and the vertical axis along the Y-axis represents the image height, both in mm. In the astigmatism curve diagram, T represents the curvature of the imaging surface 101 in the meridional direction, and S represents the curvature of the imaging surface 101 in the sagittal direction. Figure 1B , Figure 2B As can be seen from (B) in the figure, the astigmatism of the optical system 100 is well compensated at this wavelength.

[0123] Please see Figure 1B , Figure 2B (C) in the middle, Figure 1B , Figure 2B (C) in the figure is a distortion curve of the optical system 100 in the first embodiment at a wavelength of 555 nm. The horizontal axis along the X-axis represents distortion, and the vertical axis along the Y-axis represents image height, in mm. Figure 1B , Figure 2B As can be seen from (C) in the figure, the distortion of the optical system 100 is well corrected at this wavelength.

[0124] Second Embodiment

[0125] like Figure 3AAs shown in the diagram, this embodiment only illustrates the structure of the optical lens in its telephoto state; the near-focus state is not shown. In this embodiment, except for the image-side surface of the sixth lens L6, which is convex near the optical axis, the surface shapes of the other lenses are the same as in the first embodiment, and will not be described in detail here.

[0126] In this embodiment, the refractive power design of the first lens L1 to the eighth lens is the same as that in Embodiment 1, and the surface design of the first lens L1 to the eighth lens is also the same as that in Embodiment 1, which will not be repeated here.

[0127] Specifically, the parameters of the optical system 100 are given in Table 3 below. The definitions of each parameter can be derived from the description of the foregoing embodiments and will not be repeated here. Wherein, f = 8.563mm, FOV = 86.208dg, FNO = 1.64. Furthermore, in this application, in the near-focus state, the object distance of the optical lens is A = 130mm, B = 1.323mm, and TTL = 11.758mm. In the telephoto state, the object distance of the optical lens is infinite, B = 0.830mm, and TTL = 11.265mm. Table 4 below gives the higher-order coefficients that can be used for each aspherical lens in the second embodiment.

[0128] Table 3

[0129]

[0130]

[0131] Table 4

[0132]

[0133]

[0134] Please see Figure 3B , Figure 3C ,Depend on Figure 3B , Figure 3C As can be seen from (B) the ray astigmatism diagram and (C) the distortion curve diagram, the astigmatism and distortion of the optical system 100 are well controlled, thus the optical system 100 of this embodiment has good imaging quality. Furthermore, regarding... Figure 3B , Figure 3C (B) and Figure 3B , Figure 3C The wavelengths corresponding to the curves in (C) can be referred to in the first embodiment regarding... Figure 1B , Figure 2B (B) Figure 1B , Figure 2B The content described in (C) will not be repeated here.

[0135] Third Embodiment

[0136] like Figure 4A As shown in the figure, this embodiment only shows a schematic diagram of the optical lens in the telephoto state; the near-focus state is not shown. In this embodiment, the refractive power design of the first lens L1 to the eighth lens is the same as that in Embodiment 1, and the surface design of the first lens L1 to the eighth lens is also the same as that in Embodiment 1, which will not be repeated here.

[0137] Specifically, the parameters of the optical system 100 are given in Table 5 below. The definitions of each parameter can be derived from the description of the foregoing embodiments and will not be repeated here. Wherein, f = 8.37mm, FOV = 87.574dg, FNO = 1.636. Furthermore, in this application, in the near-focus state, the object distance of the optical lens is A = 130mm, B = 0.974mm, and TTL = 11.606mm. In the telephoto state, the object distance of the optical lens is infinite, B = 0.571mm, and TTL = 11.204mm. Table 6 below gives the higher-order coefficients that can be used for each aspherical lens in the third embodiment.

[0138] Table 5

[0139]

[0140] Table 6

[0141]

[0142] Please see Figure 4B , Figure 4C ,Depend on Figure 4B , Figure 4C As can be seen from (B) the ray astigmatism diagram and (C) the distortion curve diagram, the astigmatism and distortion of the optical system 100 are well controlled, thus the optical system 100 of this embodiment has good imaging quality. Furthermore, regarding the figures... Figure 4B , Figure 4C (B) in the middle and the figure Figure 4B , Figure 4C The wavelengths corresponding to the curves in (C) can be referred to in the first embodiment regarding... Figure 1B , Figure 2B (B) Figure 1B , Figure 2B The content described in (C) will not be repeated here.

[0143] Fourth embodiment

[0144] like Figure 5AAs shown in the diagram, this embodiment only illustrates the structure of the optical lens in its telephoto state; the near-focus state is not shown. In this embodiment, the first lens L1 has positive refractive power, the second lens L2 has negative refractive power, the third lens L3 has positive refractive power, the fourth lens L4 has positive refractive power, the fifth lens L5 has negative refractive power, the sixth lens L6 has positive refractive power, the seventh lens L7 has positive refractive power, and the eighth lens L8 has negative refractive power.

[0145] In this embodiment, the object-side surface S1 and image-side surface 12 of the first lens L1 are convex and concave near the optical axis, respectively; the object-side surface S3 and image-side surface 22 of the second lens L2 are convex and concave near the optical axis, respectively; the object-side surface S5 and image-side surface S6 of the third lens L3 are convex and concave near the optical axis, respectively; the object-side surface S7 and image-side surface S8 of the fourth lens L4 are convex and concave near the optical axis, respectively; the object-side surface S9 and image-side surface S10 of the fifth lens L5 are convex and concave near the optical axis, respectively; the object-side surface S11 and image-side surface S12 of the sixth lens L6 are convex and concave near the optical axis, respectively; the object-side surface and image-side surface of the seventh lens are convex and concave near the optical axis, respectively; and the object-side surface and image-side surface of the eighth lens are both concave near the optical axis.

[0146] Specifically, the parameters of the optical system 100 are given in Table 7 below. The definitions of each parameter can be derived from the description of the foregoing embodiments and will not be repeated here. Wherein, f = 8.942mm, FOV = 83.38dg, FNO = 1.63. Furthermore, in this application, in the near-focus state, the object distance of the optical lens is A = 130mm, B = 0.834mm, and TTL = 11.729mm. In the telephoto state, the object distance of the optical lens is infinite, B = 0.300mm, and TTL = 11.195mm. Correspondingly, Table 8 below gives the higher-order coefficients that can be used for each aspherical lens in the fourth embodiment.

[0147] Table 7

[0148]

[0149] Table 8

[0150]

[0151]

[0152] Please see Figure 5B , Figure 5C , Figure 5B , Figure 5C As can be seen from (B) the ray astigmatism diagram and (C) the distortion curve diagram, the astigmatism and distortion of the optical system 100 are well controlled, thus the optical system 100 of this embodiment has good imaging quality. Furthermore, regarding... Figure 5B , Figure 5C (B) and Figure 5B , Figure 5C The wavelengths corresponding to the curves in (C) can be referred to in the first embodiment regarding... Figure 1B , Figure 2B (B) Figure 1B , Figure 2B The content described in (C) will not be repeated here.

[0153] Fifth embodiment

[0154] like Figure 6A As shown in the figure, this embodiment only illustrates the structural diagram of the optical lens in the telephoto state; the near-focus state is not shown. In this embodiment, the refractive power design of the first lens L1 to the eighth lens is consistent with that of the fourth embodiment, and the surface design of the first lens L1 to the eighth lens is also consistent with that of the fourth embodiment. Therefore, this embodiment will not elaborate further on these aspects.

[0155] Specifically, the parameters of the optical system 100 are given in Table 9 below. The definitions of each parameter can be derived from the description of the foregoing embodiments and will not be repeated here. Wherein, f = 9.023mm, FOV = 82.486dg, and FNO = 1.6. Furthermore, in this application, in the near-focus state, the object distance of the optical lens is A = 130mm, B = 0.834mm, and TTL = 11.652mm. In the telephoto state, the object distance of the optical lens is infinite, B = 0.284mm, and TTL = 11.102mm. Correspondingly, Table 10 gives the higher-order coefficients that can be used for each aspherical lens in the fifth embodiment.

[0156] Table 9

[0157]

[0158]

[0159] Table 10

[0160]

[0161] Please see Figure 6B , Figure 6C ,Depend on Figure 6B , Figure 6C As can be seen from (B) the ray astigmatism diagram and (C) the distortion curve diagram, the astigmatism and distortion of the optical system 100 are well controlled, thus the optical system 100 of this embodiment has good imaging quality. Furthermore, regarding... Figure 6B , Figure 6C (B) and Figure 6B , Figure 6CThe wavelengths corresponding to the curves in (C) can be referred to in the first embodiment regarding... Figure 1B , Figure 2B (B) Figure 1B , Figure 2B The content described in (C) will not be repeated here.

[0162] Sixth Embodiment

[0163] like Figure 7A As shown in the figure, this embodiment only illustrates the structural diagram of the optical lens in the telephoto state; the near-focus state is not shown. In this embodiment, the refractive power design of the first lens L1 to the eighth lens is consistent with that of the fourth embodiment, and the surface design of the first lens L1 to the eighth lens is also consistent with that of the fourth embodiment. Therefore, this embodiment will not elaborate further on these aspects.

[0164] Specifically, the parameters of the optical system 100 are given in Table 11 below. The definitions of each parameter can be derived from the description of the foregoing embodiments and will not be repeated here. Wherein, f = 8.65mm, FOV = 86dg, FNO = 1.63. Furthermore, in this application, in the near-focus state, the object distance of the optical lens is A = 130mm, B = 0.801mm, and TTL = 11.315mm. In the telephoto state, the object distance of the optical lens is infinite, B = 0.304mm, and TTL = 10.818mm. Correspondingly, Table 12 gives the higher-order coefficients that can be used for each aspherical lens in the sixth embodiment.

[0165] Table 11

[0166]

[0167] Table 12

[0168]

[0169]

[0170] Please see Figure 7B , Figure 7C ,Depend on Figure 7B , Figure 7C As can be seen from (B) the ray astigmatism diagram and (C) the distortion curve diagram, the astigmatism and distortion of the optical system 100 are well controlled, thus the optical system 100 of this embodiment has good imaging quality. Furthermore, regarding... Figure 7B , Figure 7C (B) and Figure 7B , Figure 7C The wavelengths corresponding to the curves in (C) can be referred to in the first embodiment regarding... Figure 1B , Figure 2B (B) Figure 1B , Figure 2BThe content described in (C) will not be repeated here.

[0171] Seventh Embodiment

[0172] like Figure 8A As shown in the figure, this embodiment only shows a schematic diagram of the optical lens in the telephoto state; the near-focus state is not shown. In this embodiment, in the refractive power design of the first lens L1 to the eighth lens, except for the seventh lens which has negative refractive power, the refractive power of the other lenses is the same as that in the fourth embodiment. The surface design of the first lens L1 to the eighth lens is also the same as that in the fourth embodiment, and will not be described again in this embodiment.

[0173] Specifically, the parameters of the optical system 100 are given in Table 13 below. The definitions of each parameter can be derived from the description of the foregoing embodiments and will not be repeated here. Wherein, f = 10.28mm, FOV = 76dg, FNO = 2. Furthermore, in this application, in the near-focus state, the object distance of the optical lens is A = 130mm, B = 0.919mm, and TTL = 13.289mm. In the telephoto state, the object distance of the optical lens is infinite, B = 0.300mm, and TTL = 12.67mm. Correspondingly, Table 14 gives the higher-order coefficients that can be used for each aspherical lens in the seventh embodiment.

[0174] Table 13

[0175]

[0176]

[0177] Table 14

[0178]

[0179] Please see Figure 8B , Figure 8C ,Depend on Figure 8B , Figure 8C As can be seen from (B) the ray astigmatism diagram and (C) the distortion curve diagram, the astigmatism and distortion of the optical system 100 are well controlled, thus the optical system 100 of this embodiment has good imaging quality. Furthermore, regarding... Figure 8B , Figure 8C (B) and Figure 8B , Figure 8C The wavelengths corresponding to the curves in (C) can be referred to in the first embodiment regarding... Figure 1B , Figure 2B (B) Figure 1B , Figure 2B The content described in (C) will not be repeated here.

[0180] Eighth embodiment

[0181] like Figure 9A As shown in the figure, this embodiment only illustrates the structural diagram of the optical lens in the telephoto state; the near-focus state is not shown. In this embodiment, the refractive power design of the first lens L1 to the eighth lens is consistent with that of the fourth embodiment, and the surface shape design of the first lens L1 to the eighth lens is also consistent with that of the fourth embodiment. Therefore, this embodiment will not elaborate further on these aspects.

[0182] Specifically, the parameters of the optical system 100 are given in Table 15 below. The definitions of each parameter can be derived from the description of the foregoing embodiments and will not be repeated here. Wherein, f = 9.01mm, FOV = 83.45dg, FNO = 2.2. Furthermore, in this application, in the near-focus state, the object distance of the optical lens is A = 130mm, B = 0.834mm, and TTL = 11.727mm. In the telephoto state, the object distance of the optical lens is infinite, B = 0.300mm, and TTL = 11.194mm. Correspondingly, Table 16 gives the higher-order coefficients that can be used for each aspherical lens in the eighth embodiment.

[0183] Table 15

[0184]

[0185] Table 16

[0186]

[0187]

[0188] Please see Figure 9B , Figure 9C ,Depend on Figure 9B , Figure 9C As can be seen from (B) the ray astigmatism diagram and (C) the distortion curve diagram, the astigmatism and distortion of the optical system 100 are well controlled, thus the optical system 100 of this embodiment has good imaging quality. Furthermore, regarding... Figure 9B , Figure 9C (B) and Figure 9B , Figure 9C The wavelengths corresponding to the curves in (C) can be referred to in the first embodiment regarding... Figure 1B , Figure 2B (B) Figure 1B , Figure 2B The content described in (C) will not be repeated here.

[0189] Refer to Table 17, which summarizes the ratios of the relationships in the first to eighth embodiments of this application.

[0190] Table 17

[0191]

[0192]

[0193] Please see Figure 10 This application also discloses a camera module 200, which includes an image sensor 201 and an optical system 100 as described in any of the first to eighth embodiments of the first aspect above. The image sensor 201 is disposed on the image side of the optical system 100. The optical system 100 is used to receive the light signal of the subject and project it onto the image sensor 201. The image sensor 201 is used to convert the light signal corresponding to the subject into an image signal, which will not be elaborated here. It can be understood that the camera module 200 with the above-described optical system 100 has all the technical effects of the above-described optical system 100, that is, it can achieve internal focusing to improve the image quality when shooting close-ups while taking into account miniaturization design. Since the above-described technical effects have been described in detail in the embodiments of the optical system 100, they will not be repeated here.

[0194] Please see Figure 11 This application also discloses an electronic device 300, which includes a housing 301 and the aforementioned camera module 200, with the camera module 200 disposed within the housing. Specifically, the camera module 200 can be disposed inside the housing 301 or on the housing 301. The electronic device 300 can be, but is not limited to, a mobile phone, tablet computer, laptop computer, smartwatch, monitor, etc. It is understood that the electronic device 300 with the aforementioned camera module 200 also possesses all the technical effects of the aforementioned optical system 100. That is, it can achieve internal focusing to improve image quality during close-up shots while maintaining a miniaturized design. Since the aforementioned technical effects have been described in detail in the embodiments of the optical system 100, they will not be repeated here.

[0195] The optical system, camera module, and electronic device disclosed in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the optical system, camera module, and electronic device of this application and their core ideas. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. An optical system, characterized in that, There are a total of eight lenses with refractive power, including those arranged in sequence from the object side to the image side along the optical axis as follows: The first lens group, which includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens arranged in sequence from the object side to the image side along the optical axis. The first lens has refractive power. The object side surface of the first lens is convex near the optical axis, and the image side surface of the first lens is concave near the optical axis. The second lens has refractive power. The object side surface of the second lens is convex near the optical axis. The third lens has refractive power. The object side surface of the third lens is convex near the optical axis, and the image side surface of the third lens is concave near the optical axis. The fourth lens has positive refractive power. The object side surface of the fourth lens is convex near the optical axis. The fifth lens has negative refractive power. The image side surface of the fifth lens is concave near the optical axis. The sixth lens has positive refractive power. The object side surface of the sixth lens is convex near the optical axis, and the image side surface of the sixth lens is concave near the optical axis; and The second lens group, which includes a seventh lens and an eighth lens arranged in sequence from the object side to the image side along the optical axis. The seventh lens has refractive power. The eighth lens has negative refractive power. The object side surface and the image side surface of the eighth lens are both concave near the optical axis. The optical system satisfies the relationship: 1.25 < TTL / ImgH < 1.65; Wherein, the second lens group is fixed relative to the imaging surface of the optical system, the first lens group can move relative to the second lens group along the optical axis direction, TTL is the distance from the object side surface of the first lens to the imaging surface of the optical system on the optical axis, and ImgH is half of the image height corresponding to the maximum field angle of the optical system.

2. The optical system according to claim 1, characterized in that, The optical system satisfies the following relationships: 2 < f4 / f < 3.8, and / or, -7 < f5 / f < -1, and / or, 0.9 < f6 / f < 2.1, and / or, -1.7 < f / f8 < -0.9; Wherein, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, f8 is the focal length of the eighth lens, and f is the focal length of the optical system.

3. The optical system according to claim 1, characterized in that, The optical system satisfies the following relationships: 1.2 < f / R11 < 2.4, and / or, 0.3 < f / R12 < 2, and / or, 1.3 < f / R21 < 2.4, and / or, 0.7 < f / R31 < 2.8, and / or, 0.5 < f / R32 < 3.1, and / or, 1.1 < R41 / f < 8, and / or, 1.2 < f / R51 < 13, and / or, 0.8 < f / R52 < 1.4, and / or, 1.6 < f / R61 < 2.2, and / or, 0.8 < R62 / f < 5; Where, R11 is the curvature radius of the object side of the first lens on the optical axis, R12 is the curvature radius of the image side of the first lens on the optical axis, R21 is the curvature radius of the object side of the second lens on the optical axis, R31 is the curvature radius of the object side of the third lens on the optical axis, R32 is the curvature radius of the image side of the third lens on the optical axis, R41 is the curvature radius of the object side of the fourth lens on the optical axis, R51 is the curvature radius of the object side of the fifth lens on the optical axis, R52 is the curvature radius of the image side of the fifth lens on the optical axis, R61 is the curvature radius of the object side of the sixth lens on the optical axis, R62 is the curvature radius of the image side of the sixth lens on the optical axis, and f is the focal length of the optical system.

4. The optical system according to claim 1, characterized in that, The optical system satisfies the following relationships: 0.15 < R11 / R12 < 1.5, and / or, 0.7 < R32 / R31 < 1.6, and / or, 0.2 < R42 / R41 < 4.5, and / or, 1.2 < R51 / R52 < 12, and / or, 1.7 < R62 / R61 < 9, and / or, 0.4 < R32 / R11 < 4; Where, R11 is the curvature radius of the object side of the first lens on the optical axis, R12 is the curvature radius of the image side of the first lens on the optical axis, R31 is the curvature radius of the object side of the third lens on the optical axis, R32 is the curvature radius of the image side of the third lens on the optical axis, R41 is the curvature radius of the object side of the fourth lens on the optical axis, R42 is the curvature radius of the image side of the fourth lens on the optical axis, R51 is the curvature radius of the object side of the fifth lens on the optical axis, R52 is the curvature radius of the image side of the fifth lens on the optical axis, R61 is the curvature radius of the object side of the sixth lens on the optical axis, R62 is the curvature radius of the image side of the sixth lens on the optical axis.

5. The optical system according to claim 1, characterized in that, The optical system satisfies the following relationships: 0.81 < DLmax / TTL < 0.95, and / or, 1.2 < TTL / f < 1.45, and / or, 1.05 < TTL / (TD123456 + TD78) < 1.45, and / or, 1.8 < TD123456 / TD78 < 3.8; Where, DLmax is the maximum distance on the optical axis from the object side of the first lens to the image side of the eighth lens, TD123456 is the distance on the optical axis from the object side of the first lens to the image side of the sixth lens, TD78 is the distance on the optical axis from the object side of the seventh lens to the image side of the eighth lens, and f is the focal length of the optical system.

6. The optical system according to claim 1, characterized in that, The optical system satisfies the following relationships: 2.7 < ImgH / SD11 < 4.5, and / or, 1.65 < ImgH / SD62 < 2.8 and / or, 1 < SD41 / SD32 < 1.1, and / or, 1.7 < SD11 / CT1 < 9; Where, SD11 is the maximum effective semi-aperture of the object side of the first lens, SD32 is the maximum effective semi-aperture of the image side of the third lens, SD41 is the maximum effective semi-aperture of the object side of the fourth lens, SD62 is the maximum effective semi-aperture of the image side of the sixth lens, and CT1 is the thickness of the first lens on the optical axis.

7. The optical system according to claim 1, characterized in that, The optical system satisfies the following relational expressions: 1.1 < ∑CT / CT123456 < 1.6, and / or, 2.6 < ∑CT / CT78 < 5.5, and / or, 12 < ∑CT / CT5 < 16, and / or, 1.6 < CT6 / CT5 < 3.6, and / or, 0.4 < CT2 / CT3 < 2.8, and / or, 0.25 < CT1 / CT2 < 4.5, and / or, 1.5 < CT4 / CT5 < 2.6, and / or, 0.8 < CT6 / CT4 < 1.83, and / or, 0.9 < CT4 / CT3 < 2.3, and / or, 0.9 < AT78 / CT8 < 2.6; Where, CT123456 is the sum of the thicknesses of each lens on the optical axis from the first lens to the sixth lens, CT78 is the sum of the thicknesses of the seventh lens and the eighth lens on the optical axis, ∑CT is the sum of the thicknesses of each lens on the optical axis from the first lens to the eighth lens, CT1 is the thickness of the first lens on the optical axis, CT2 is the thickness of the second lens on the optical axis, CT3 is the thickness of the third lens on the optical axis, CT4 is the thickness of the fourth lens on the optical axis, CT5 is the thickness of the fifth lens on the optical axis, CT6 is the thickness of the sixth lens on the optical axis, AT78 is the distance on the optical axis from the image side of the seventh lens to the object side of the eighth lens, and CT8 is the thickness of the eighth lens on the optical axis.

8. The optical system according to claim 1, characterized in that, The optical system satisfies the following relational expressions: 74deg < FOV < 90deg, and / or, 1.5 < FNO < 2.3, and / or, 1.4 < Bz2 / Bz1 < 3.3; Where, FOV is the maximum field angle of view of the optical system, FNO is the f-number of the optical system, Bz1 is the distance on the optical axis from the image side of the sixth lens to the object side of the seventh lens when the optical system is in the telephoto state, and Bz2 is the distance on the optical axis from the image side of the sixth lens to the object side of the seventh lens when the optical system is in the close-focus state.

9. A camera module, characterized in that, The imaging module includes an image sensor and the optical system according to any one of claims 1-8, and the image sensor is disposed on the image side of the optical system.

10. An electronic device, characterized in that, The electronic device includes a housing and the imaging module according to claim 9, and the imaging module is disposed in the housing.

Images