Optical system, camera module and electronic device

Abstract

This application discloses an optical system, a camera module, and an electronic device. The system comprises seven refractive lenses. Along the optical axis from the object side to the image side, the optical system includes: an adjustable aperture for adjusting the aperture size; a first lens with positive refractive power, where the object side is convex near the optical axis and the image side is concave near the optical axis; a second lens with negative refractive power; a third lens with refractive power; a fourth lens with refractive power, where the object side is convex near the optical axis and the image side is concave near the optical axis; a fifth lens with negative refractive power, where the image side is concave near the optical axis; a sixth lens with positive refractive power, where the object side is convex near the optical axis; and a seventh lens with negative refractive power, where the object side is convex near the optical axis and the image side is concave near the optical axis. Through the rational design of each lens in the optical system, the system can achieve miniaturization, good imaging performance, and adjustable aperture characteristics.

Description

Technical Field

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

[0002] In recent years, various mobile electronic devices equipped with camera modules (including various portable information terminals such as digital cameras, smart phones, laptop computers, tablet computers, etc.) have been rapidly developing and popularizing. Adjustable aperture systems were originally mostly used in digital cameras or video cameras, and have characteristics such as high-quality imaging effects and adjustable apertures. Nowadays, micro camera units with miniaturized imaging units are also increasingly used in other widely used electronic devices.

[0003] To adapt to the trend of gradually increasing pixel numbers, gradually expanding adjustable apertures, and miniaturization of optical imaging lenses, more stringent requirements and more urgent needs have been put forward for the specifications of electronic devices. However, the implementation of an adjustable aperture and the combination of multiple lenses will result in a relatively large volume of the optical system, making it difficult to meet the development trend of miniaturization. Summary of the Invention

[0004] In view of the above, it is necessary to provide an optical system, a camera module, and an electronic device to solve the problems that the optical system needs to meet miniaturization, have good imaging effects, and an adjustable aperture.

[0005] In a first aspect, an embodiment of the present application provides an optical system, which has a total of seven lenses with refractive power, and successively includes, along the optical axis from the object side to the image side: an adjustable aperture for adjusting the aperture size; a first lens with positive refractive power, the object side surface being convex near the optical axis, and the image side surface being concave near the optical axis; a second lens with negative refractive power; a third lens with refractive power; a fourth lens with refractive power, the object side surface being convex near the optical axis, and the image side surface being concave near the optical axis; a fifth lens with negative refractive power, the image side surface being concave near the optical axis; a sixth lens with positive refractive power, the object side surface being convex near the optical axis; a seventh lens with negative refractive power, the object side surface being convex near the optical axis, and the image side surface being concave near the optical axis; the optical system satisfies the following relational expressions: 80° < FOV < 90°; 33 < FOV / (FNOmax - FNOmin) < 38; 1.2 < TTL / ImgH < 1.3; where FOV is the maximum field of view angle of the optical system, FNOmax is the maximum f-number of the optical system, FNOmin is the minimum f-number of the optical system, 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 of view angle of the optical system.

[0006] The above optical system arranges the first lens to the seventh lens in sequence starting from the object side. The adjustable aperture is located at the front end of the first lens, which can achieve aperture changes from a large aperture to a small aperture to control the light input. The first lens has a positive refractive power, its object side is convex at the optical axis, and its image side is concave at the optical axis, which is beneficial for the incidence and convergence of light in a large field of view range and ensures a small lens diameter at the same time. The second lens has a negative refractive power, which helps to correct the aberration generated by the front lens. The third lens and the fourth lens have refractive powers, the fifth lens has a negative refractive power, and the object side of the fourth lens is convex near the optical axis, and its image side is concave near the optical axis. The image side of the fifth lens is concave near the optical axis, which is beneficial for correcting the distortion, spherical aberration and astigmatism generated by the front group of lenses. The sixth lens has a positive refractive power, its object and image sides are convex at the optical axis, which is beneficial for correcting aberration. The seventh lens has a negative refractive power, its object side is convex at the optical axis, and its image side is concave at the optical axis, which can shorten the total length and correct aberration, and at the same time can suppress the light emission angle.

[0007] By making the optical system satisfy 80° < FOV < 90°, the maximum field of view angle of the optical system can be controlled within a reasonable range, which can avoid introducing excessive aberration and is beneficial for the optical system to meet the characteristics of miniaturization while obtaining sufficient field of view.

[0008] By making the optical system satisfy 33 < FOV / (FNOmax - FNOmin) < 38, the optical system can have a large field of view angle, and the f-number of the optical system is maintained within a reasonable range, achieving the combined effect of a large field of view angle and a large aperture for the optical system. The optical system has a reasonable light input, improving the overall illuminance of the imaging picture and making the optical system suitable for different lighting environments.

[0009] By making the optical system satisfy 1.2 < TTL / ImgH < 1.3, the ratio of the distance from the object side of the first lens to the imaging surface of the optical system on the optical axis to half of the image height corresponding to the maximum field of view angle of the optical system can be reasonably configured, which is beneficial for improving the resolution of the optical system in the full field of view and improving the imaging quality of the edge field of view. At the same time, it is also beneficial for the optical system to have a smaller optical total length and achieve the characteristics of miniaturization.

[0010] Secondly, embodiments of this application also provide a camera module, including: the optical system described in any of the above embodiments; and a photosensitive chip located on the image side of the optical system. The photosensitive surface of the photosensitive chip is located on the imaging surface of the optical system, and light rays from an object incident on the photosensitive surface through a lens can be converted into electrical signals for an image. The photosensitive chip can be a complementary metal-oxide-semiconductor (CMOS) or a charge-coupled device (CCD). This camera module can be an imaging module integrated into an electronic device or a standalone lens. By incorporating the optical system provided in this application into the camera module, the surface shape and refractive power of each lens in the optical system can be rationally designed, enabling the camera module to achieve miniaturization, good imaging effect, and adjustable aperture characteristics.

[0011] Thirdly, embodiments of this application also provide an electronic device, including: a housing; and the camera module described in the second aspect, wherein the camera module is disposed within the housing. The electronic device includes, but is not limited to, smartphones, computers, and smartwatches. By incorporating the camera module provided by this invention into the electronic device, the device achieves miniaturization, good imaging performance, and adjustable aperture characteristics. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the optical system in the first embodiment under the first aperture state.

[0013] Figure 2 It shows Figure 1 The diagram shows the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system shown.

[0014] Figure 3 This is a schematic diagram of the optical system in the second aperture state according to the first embodiment.

[0015] Figure 4 It shows Figure 3 The diagram shows the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system shown.

[0016] Figure 5 This is a schematic diagram of the optical system in the third aperture state of the first embodiment.

[0017] Figure 6 It shows Figure 5 The diagram shows the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system shown.

[0018] Figure 7 This is a schematic diagram of the optical system in the fourth aperture state of the first embodiment.

[0019] Figure 8 It shows Figure 7 The diagram shows the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system shown.

[0020] Figure 9 This is a schematic diagram of the optical system in the first aperture state according to the second embodiment.

[0021] Figure 10 It shows Figure 9 The diagram shows the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system shown.

[0022] Figure 11 This is a schematic diagram of the optical system in the first aperture state according to the third embodiment.

[0023] Figure 12 It shows Figure 11 The diagram shows the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system shown.

[0024] Figure 13 This is a schematic diagram of the optical system in the first aperture state according to the fourth embodiment.

[0025] Figure 14 It shows Figure 13 The diagram shows the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system shown.

[0026] Figure 15 This is a schematic diagram of the optical system in the first aperture state according to the fifth embodiment.

[0027] Figure 16 It shows Figure 15 The diagram shows the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system shown.

[0028] Figure 17 This is a schematic diagram of the optical system in the first aperture state according to the sixth embodiment.

[0029] Figure 18 It shows Figure 17 The diagram shows the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system shown.

[0030] Figure 19 This is a schematic diagram of the structure of a camera module provided in one embodiment of this application.

[0031] Figure 20 This is a schematic diagram of the structure of an electronic device provided in one embodiment of this application.

[0032] Explanation of key component symbols: Optical system 10, optical axis 101, first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, filter IR, object side surface S1, S3, S5, S7, S9, S11, S13, S15, image side surface S2, S4, S6, S8, S10, S12, S14, S16, adjustable aperture STO, imaging plane IMG. Detailed Implementation

[0033] The embodiments of this application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0034] Firstly, please see Figure 1 This application provides an optical system 10, which has seven lenses with refractive power. Along the optical axis 101 from the object side to the image side, the lenses include an adjustable aperture STO, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7.

[0035] The adjustable aperture STO is used to adjust the aperture size. The first lens L1 has positive refractive power; its object-side surface S1 is convex near the optical axis 101, and its image-side surface S2 is concave near the optical axis 101. The second lens L2 has negative refractive power. The third lens L3 has refractive power. The fourth lens L4 has refractive power; its object-side surface S7 is convex near the optical axis 101, and its image-side surface S8 is concave near the optical axis 101. The fifth lens L5 has negative refractive power; its image-side surface S10 is concave near the optical axis 101. The sixth lens L6 has positive refractive power; its object-side surface S11 is convex near the optical axis 101. The seventh lens L7 has negative refractive power; its object-side surface S13 is convex near the optical axis 101, and its image-side surface S14 is concave near the optical axis 101.

[0036] The above optical system 10 arranges the first lens L1 to the seventh lens L7 in sequence starting from the object side. The adjustable aperture STO is located at the front end of the first lens L1, which can achieve aperture change from a large aperture to a small aperture to control the amount of incident light. The first lens L1 has a positive refractive power. Its object side S1 is convex at the optical axis 101, and its image side S2 is concave at the optical axis 101, which is beneficial to the incidence and convergence of light rays in a large field of view range, and at the same time ensures a small lens diameter; the second lens L2 has a negative refractive power, which helps to correct the aberration generated by the front lens; the third lens L3 and the fourth lens L4 have refractive powers, the fifth lens L5 has a negative refractive power, and the object side S7 of the fourth lens L4 is convex near the optical axis 101, and the image side S8 is concave near the optical axis 101. The image side S10 of the fifth lens L5 is concave near the optical axis 101, which is beneficial to correcting the distortion, spherical aberration and astigmatism generated by the front group of lenses; the sixth lens L6 has a positive refractive power, and its image object side S11 is convex at the optical axis 101, which is beneficial to correcting aberration. The seventh lens L7 has a negative refractive power, its object side S13 is convex at the optical axis 101, and its image side S14 is concave at the optical axis 101, which can shorten the overall length and correct aberration, and at the same time suppress the light exit angle.

[0037] The optical system 10 satisfies the following relationship: 80° < FOV < 90°, where FOV is the maximum field of view angle of the optical system 10. Satisfying the above relationship can control the maximum field of view angle of the optical system 10 within a reasonable range, avoid introducing excessive aberration, and is beneficial to the optical system 10 to meet the characteristics of miniaturization while obtaining sufficient field of view.

[0038] The optical system 10 satisfies the following relationship: 33 < FOV / (FNOmax - FNOmin) < 38, where FNOmax is the maximum f-number of the optical system 10, and FNOmin is the minimum f-number of the optical system 10. Satisfying the above relationship can enable the optical system 10 to have a large field of view angle, and the f-number of the optical system 10 is maintained within a reasonable range, achieving the combined effect of a large field of view angle and a large aperture for the optical system 10. The optical system 10 has a reasonable amount of incident light, improves the overall illuminance of the imaging picture, and makes the optical system 10 suitable for different lighting environments.

[0039] The optical system 10 satisfies the following relationship: 1.2 < TTL / ImgH < 1.3, where TTL is the distance from the object side surface S1 of the first lens L1 to the imaging surface IMG of the optical system 10 on the optical axis 101, and ImgH is half of the image height corresponding to the maximum field angle of the optical system 10. Satisfying the above relationship can reasonably configure the ratio of the distance from the object side surface S1 of the first lens L1 to the imaging surface IMG of the optical system 10 on the optical axis 101 to half of the image height corresponding to the maximum field angle of the optical system 10, which is beneficial to improving the resolution of the optical system 10 in the full field and enhancing the imaging quality of the edge field; at the same time, it is also beneficial to make the optical system 10 have a smaller overall optical length and achieve the characteristic of miniaturization.

[0040] In one embodiment, the optical system 10 satisfies the relationship: 1.1 < f1 / f < 1.4, where f1 is the effective focal length of the first lens L1 and f is the effective focal length of the optical system 10. Satisfying the above relationship is beneficial to the proper cooperation of the refractive power of the first lens L1 in the optical system 10, making the surface shape design of the first lens L1 simpler and more flexible, enabling the first lens L1 to support a larger field angle and a large aperture. At the same time, it is also beneficial to converge the light rays incident from the first lens L1 to the optical system 10, delay the incident angle of the light rays, reduce aberration, and simplify the overall aberration correction of the optical system 10 and the balance of imaging quality.

[0041] In one embodiment, the optical system 10 satisfies the relationship: -9 < f2 / f < -4, where f2 is the effective focal length of the second lens L2. Satisfying the above relationship is beneficial to the proper cooperation of the refractive power of the second lens L2 in the optical system 10, making the surface shape design of the second lens L2 simpler and more flexible, reducing aberration, and simplifying the overall aberration correction of the optical system 10 and the balance of imaging quality.

[0042] In one embodiment, the optical system 10 satisfies the relationship: 3 < |f3| / f, where f3 is the effective focal length of the third lens L3. Satisfying the above relationship is beneficial to the proper cooperation of the refractive power of the third lens L3 in the optical system 10, making the surface shape design of the third lens L3 simpler and more flexible, reducing aberration, and simplifying the overall aberration correction of the optical system 10 and the balance of imaging quality.

[0043] In one embodiment, the optical system 10 satisfies the relationship: 4 < |f4| / f, where f4 is the effective focal length of the fourth lens L4. Satisfying the above relationship is beneficial to the fourth lens L4 and the foregoing three lenses to form a double Gauss structure, eliminating aberration and making the light rays transfer smoothly to the subsequent lenses.

[0044] In one embodiment, the optical system 10 satisfies the relation: -2.3 < f5 / f < -1.8, where f5 is the effective focal length of the fifth lens L5. Satisfying the above relation is beneficial for the fifth lens L5 to gently diffuse the light beam, laying a foundation for subsequent large image plane imaging.

[0045] In one embodiment, the optical system 10 satisfies the relation: 1.3 < f / f6 < 1.5, where f6 is the effective focal length of the sixth lens L6. Satisfying the above relation is beneficial for the sixth lens L6 to balance the aberration of the foregoing lenses and improve the imaging quality.

[0046] In one embodiment, the optical system 10 satisfies the relation: -1.4 < f / f7 < -1.1, where f7 is the effective focal length of the seventh lens L7. Satisfying the above relation is beneficial for the seventh lens L7 to shorten the back focal length and achieve the miniaturized design of the optical system 10.

[0047] Define R2n-1 as the curvature radius of the object side surface of the nth lens at the optical axis 101, and R2n as the curvature radius of the image side surface of the nth lens at the optical axis 101, where n takes any integer from 1 to 7. Specifically, the curvature radius of the object side surface S1 of the first lens L1 at the optical axis 101 is R1, and the curvature radius of the image side surface S2 of the first lens L1 at the optical axis 101 is R2, and so on.

[0048] In one embodiment, the optical system 10 satisfies the relation: 2.3 < f / R1 < 2.6. In one embodiment, the optical system 10 satisfies the relation: 0.9 < R2 / f < 1.5. Satisfying at least one of the above relations is beneficial for maintaining the astigmatism of the first lens L1 within a reasonable range, enabling the optical system 10 to have good imaging quality.

[0049] In one embodiment, the optical system 10 satisfies the relation: 1.1 < |R3| / f < 3.8. In one embodiment, the optical system 10 satisfies the relation: 0.8 < |R4| / f. Satisfying at least one of the above relations is beneficial for maintaining the astigmatism of the second lens L2 within a reasonable range and effectively balancing the astigmatism generated by the first lens L1, enabling the optical system 10 to have good imaging quality.

[0050] In one embodiment, the optical system 10 satisfies the relation: 1.5 < |R5| / f < 13. In one embodiment, the optical system 10 satisfies the relation: 5 < |R6| / f. Satisfying at least one of the above relations is beneficial for maintaining the surface shape of the third lens L3 within a reasonable range and effectively balancing the aberration generated by the first lens L1 and the second lens L2, enabling the optical system 10 to have good imaging quality.

[0051] In one embodiment, the optical system 10 satisfies the relation: 1.5 < R7 / f < 3.9. In one embodiment, the optical system 10 satisfies the relation: 1.45 < R8 / f < 1.95. Satisfying at least one of the above relations is beneficial to maintaining the surface shape of the fourth lens L4 within a reasonable range, facilitating the cooperation with the first lens L1 to the third lens L3 to form a double-Gauss structure, and enabling the optical system 10 to have good imaging quality.

[0052] In one embodiment, the optical system 10 satisfies the relation: 11 < |R9| / f. In one embodiment, the optical system 10 satisfies the relation: 1 < R10 / f < 1.3. Satisfying at least one of the above relations is beneficial to maintaining the refractive power of the fifth lens L5 within a reasonable range, avoiding excessive refractive power of the fifth lens L5, gently receiving the light from the object side, and enabling the optical system 10 to have good imaging quality.

[0053] In one embodiment, the optical system 10 satisfies the relation: 2.5 < R11 / f < 2.7. In one embodiment, the optical system 10 satisfies the relation: 20 < |R12| / f. Satisfying at least one of the above relations is beneficial to maintaining the surface shape of the sixth lens L6 within a reasonable range, achieving a balance in the overall performance with the seventh lens L7 and correcting aberrations, and enabling the optical system 10 to have good imaging quality.

[0054] In one embodiment, the optical system 10 satisfies the relation: 1.2 < f / R13 < 1.4. In one embodiment, the optical system 10 satisfies the relation: 3.5 < f / R14 < 4. Satisfying at least one of the above relations is beneficial to maintaining the surface shape of the seventh lens L7 within a reasonable range, achieving a balance in the overall performance with the sixth lens L6 and correcting aberrations, and enabling the optical system 10 to have good imaging quality.

[0055] In one embodiment, the optical system 10 satisfies the relation: -1.1 < (R11 + R12) / (R11 - R12) < -0.9. Satisfying the above relation is beneficial to correcting the astigmatism of the optical system 10, the difference in surface shapes between the two is not too large, and the incident angles of light on the two surfaces are reduced.

[0056] In one embodiment, the optical system 10 satisfies the relation: 1.3 < f12 / f < 1.5, where f12 is the combined effective focal length of the first lens L1 and the second lens L2. Satisfying the above relation is beneficial to the mutual regulation between the first lens L1 and the second lens L2 to control aberrations, facilitating the reception of large-angle incident light, and controlling the gentle entry of incident light into the optical system 10, thereby reducing the tolerance sensitivity of the optical system 10.

[0057] In one embodiment, the optical system 10 satisfies the relation: 8 < |f34| / f, where f34 is the combined effective focal length of the third lens L3 and the fourth lens L4. Satisfying the above relation is conducive to the cooperative work of the third lens L3 to the fourth lens L4 to gradually eliminate chromatic aberration, thereby improving the imaging quality.

[0058] In one embodiment, the optical system 10 satisfies the relation: 16 < |f567| / f, where f567 is the combined effective focal length of the fifth lens L5, the sixth lens L6 and the seventh lens L7. Satisfying the above relation is conducive to the cooperative work of the fifth lens L5 to the seventh lens L7 to gradually eliminate chromatic aberration, and is also beneficial to adjusting the back focal length and controlling the off-axis aberration and the incident angle of light on the imaging surface IMG.

[0059] In one embodiment, the optical system 10 satisfies the relation: 1.1 < TTL / f < 1.3. Satisfying the above relation is conducive to a reasonable configuration of the ratio of the distance from the object side surface S1 of the first lens L1 to the imaging surface IMG of the optical system 10 on the optical axis 101 to the effective focal length of the optical system 10, so that the optical system 10 has a smaller overall optical length, realizes the characteristic of miniaturization, and also enables the optical system 10 to have a better telephoto effect.

[0060] In one embodiment, the optical system 10 satisfies the relation: 0.9 < ImgH / f < 1.1. Satisfying the above relation makes the refractive power of the optical system 10 match the image surface size, and improves the imaging quality of the optical system 10.

[0061] In one embodiment, the optical system 10 satisfies the relation: 0.77 < DL / TTL < 0.81, where DL is the distance on the optical axis 101 from the object side surface S1 of the first lens L1 to the image side surface S14 of the seventh lens L7. Satisfying the above relation is conducive to a reasonable configuration of the ratio of the distance on the optical axis 101 from the object side surface S1 of the first lens L1 to the image side surface S14 of the seventh lens L7 to the distance on the optical axis 101 from the object side surface S1 of the first lens L1 to the imaging surface IMG of the optical system 10. On the premise of realizing the miniaturization of the optical system 10, the distance on the optical axis 101 from the image side surface S14 of the seventh lens L7 to the imaging surface IMG of the optical system 10 is increased, thereby increasing the layout space at the module structure end.

[0062] In one embodiment, the optical system 10 satisfies the relation: 4.3 < f7 / SAG71 < 5.6. In one embodiment, the optical system 10 satisfies the relation: -24 < f7 / SAG72 < -19. Here, SAG71 is the sagitta at the maximum effective aperture of the object side surface S13 of the seventh lens L7, and SAG72 is the sagitta at the maximum effective aperture of the image side surface S14 of the seventh lens L7. Satisfying at least one of the above relations enables reasonable setting of the effective focal length of the seventh lens L7 and the surface shape of the object side surface S13 of the seventh lens L7, which is conducive to minimizing chromatic aberration and spherical aberration to the greatest extent and improving the imaging quality of the optical system 10; meanwhile, it is also conducive to reasonably distributing the refractive power of the seventh lens L7, strengthening the light-gathering ability of the optical system 10, reducing the total length of the optical system 10, and realizing miniaturization of the optical system 10.

[0063] In one embodiment, the optical system 10 satisfies the relation: -2.1 < (SAG71 + SAG72) / CT7 < -1.4, where CT7 is the thickness of the seventh lens L7 on the optical axis 101. Satisfying the above relation is conducive to reasonably controlling the refractive power and thickness of the seventh lens L7 at various positions in the direction perpendicular to the optical axis 101, avoiding the seventh lens L7 from being too thick or too thin, reducing the incident angle of light on the object side surface S13 of the seventh lens L7, and reducing the tolerance sensitivity of the optical system 10.

[0064] In one embodiment, the optical system 10 satisfies the relation: 0.5 < Yc62 / SD62 < 0.65, where Yc62 is the vertical height from the off-axis vertex of the image side surface S12 of the sixth lens L6 to the optical axis 101, and SD62 is the maximum effective aperture of the image side surface S12 of the sixth lens L6. Satisfying the above relation is conducive to reasonably controlling the refractive power and thickness of the sixth lens L6 at various positions in the direction perpendicular to the optical axis 101, avoiding the sixth lens L6 from being too thick or too thin, reducing the incident angle of light on the object side surface S11 of the sixth lens L6, and reducing the tolerance sensitivity of the optical system 10.

[0065] In one embodiment, the optical system 10 satisfies the relation: 0.34 < Yc72 / SD72 < 0.42, where Yc72 is the vertical height from the off-axis vertex of the image side surface S14 of the seventh lens L7 to the optical axis 101, and SD72 is the maximum effective aperture of the image side surface S14 of the seventh lens L7. Satisfying the above relation is conducive to reasonably controlling the refractive power and thickness of the seventh lens L7 at various positions in the direction perpendicular to the optical axis 101, avoiding the seventh lens L7 from being too thick or too thin, reducing the incident angle of light on the object side surface S13 of the seventh lens L7, and reducing the tolerance sensitivity of the optical system 10.

[0066] Define CTn as the thickness of the n-th lens on the optical axis 101, where n is any integer from 1 to 8. Specifically, the thickness of the first lens L1 on the optical axis 101 is CT1, the thickness of the second lens L2 on the optical axis 101 is CT2, and so on.

[0067] In one embodiment, the optical system 10 satisfies the relation: 3.5 < CT1 / CT2 < 4.6. Satisfying the above relation is beneficial to form a quasi-Gauss structure and the imaging quality is better.

[0068] In one embodiment, the optical system 10 satisfies the relation: 1.3 < CT3 / CT2 < 1.9. Satisfying the above relation is beneficial to form a quasi-Gauss structure and the imaging quality is better.

[0069] In one embodiment, the optical system 10 satisfies the relation: 0.7 < CT4 / CT3 < 1.3. Satisfying the above relation is beneficial to form a quasi-Gauss structure and the imaging quality is better.

[0070] In one embodiment, the optical system 10 satisfies the relation: 1.1 < CT6 / CT5 < 2.4. Satisfying the above relation, the difference in lens sizes will not be too large, which is beneficial to the smooth transmission of the expanding light rays, avoiding the introduction of excessive aberrations, and is beneficial to the spatial arrangement of the lenses.

[0071] In one embodiment, the optical system 10 satisfies the relation: 1.2 < CT6 / CT7 < 1.4. Satisfying the above relation, the thicknesses of the two lenses are adapted to each other, which is beneficial to reducing the overall thickness and also avoiding the reduction of the yield rate due to an overly thin single lens.

[0072] In one embodiment, the optical system 10 satisfies the relation: 0.9 < (CT1 + CT2) / (CT3 + CT4 + CT5) < 1.3. Satisfying the above relation is beneficial to form a quasi-Gauss structure and the imaging quality is better.

[0073] Define ATnm as the distance between the n-th lens and the m-th lens on the optical axis 101, where n is any integer from 1 to 6 and m = n + 1. Specifically, the distance between the first lens L1 and the second lens L2 on the optical axis 101 is AT12, and so on.

[0074] In one embodiment, the optical system 10 satisfies the relation: 0.3 < AT23 / (AT12 + AT34) < 1.1. Satisfying the above relation is beneficial to reasonably control the lens gap, improve the imaging quality and assembly performance, and is beneficial to forming a quasi-Gauss structure.

[0075] In one embodiment, the optical system 10 satisfies the relation: 1.8 < T61 / CT6 < 2.2, where T61 is the distance from the maximum effective aperture of the object side surface S11 of the sixth lens L6 to the image side surface S12 of the sixth lens L6 on the optical axis 101. Satisfying the above relation can control the thickness of the sixth lens L6, which is beneficial to the spatial arrangement of the lenses and results in better imaging quality.

[0076] In one embodiment, the optical system 10 satisfies the relation: 20 < AT67max / AT67min < 41, where AT67max is the maximum interval between the sixth lens L6 and the seventh lens L7 on the optical axis 101, and AT67min is the minimum interval between the sixth lens L6 and the seventh lens L7 on the optical axis 101. When the above relation is satisfied, it is beneficial to reasonably configure the sizes and refractive powers of the sixth lens L6 and the seventh lens L7, and at the same time, it can control the displacement of the seventh lens L7 when switching between the telephoto state and the short-focus state, reduce the movement stroke of the seventh lens L7, and ensure that the motor can meet the displacement of the seventh lens L7.

[0077] Define ETn as the distance between the maximum effective aperture of the object side surface of the nth lens and the maximum effective aperture of the image side surface of the nth lens in the direction of the optical axis 101, where n takes any integer from 1 to 7. Specifically, the distance ET1 from the maximum effective aperture of the object side surface S1 of the first lens L1 to the maximum effective aperture of the image side surface S4 of the second lens L2 in the direction of the optical axis 101, and so on.

[0078] In one embodiment, the optical system 10 satisfies the relation: 0.8 < ET7 / ET6 < 1.2. Satisfying the above relation is beneficial to the spatial arrangement of the lenses and results in better imaging quality.

[0079] In one embodiment, the optical system 10 satisfies the relation: 0.7 < ET7 / CT7 < 1.1. Satisfying the above relation can avoid an excessive ratio of the thickness of the lens, and the imaging quality is better.

[0080] In some embodiments, the optical system 10 further includes an infrared cut-off filter (IR), which can be an infrared cut-off filter or an infrared bandpass filter. The infrared cut-off filter is used to filter out infrared light, while the infrared bandpass filter only allows infrared light to pass through. In this application, the IR is an infrared cut-off filter, fixedly disposed relative to each lens in the optical system 10, to prevent infrared light from reaching the imaging surface IMG of the optical system 10 and interfering with normal imaging. The IR can be assembled together with each lens as part of the optical system 10. In other embodiments, the IR can also be a component independent of the optical system 10, and the IR can be installed between the optical system 10 and the photosensitive chip during assembly. It is understood that the IR can be made of optical glass with a coating, colored glass, or other materials. The material of the IR can be glass or plastic, and can be selected according to actual needs. This embodiment does not impose specific limitations. In other embodiments, the infrared light can also be filtered out by applying a filter coating to at least one of the first lens L1 to the seventh lens.

[0081] First Embodiment

[0082] Please see Figure 1 , Figure 3 , Figure 5 and Figure 7 In this embodiment, the optical system 10, along the optical axis 101 from the object side to the image side, includes, in sequence:

[0083] The first lens L1 has positive refractive power, the object side S1 is convex near the optical axis 101, and the image side S2 is concave near the optical axis 101.

[0084] The second lens L2 has a negative refractive power, the object side S3 is convex near the optical axis 101, and the image side S4 is concave near the optical axis 101.

[0085] The third lens L3 has positive refractive power, the object side S5 is convex near the optical axis 101, and the image side S6 is concave near the optical axis 101.

[0086] The fourth lens L4 has a negative refractive power. The object-side surface S7 is convex near the optical axis 101, and the image-side surface S8 is concave near the optical axis 101.

[0087] The fifth lens L5 has a negative refractive power. The object-side surface S9 is concave near the optical axis 101, and the image-side surface S10 is concave near the optical axis 101.

[0088] The sixth lens L6 has positive refractive power. The object side S11 is convex near the optical axis 101, and the image side S12 is convex near the optical axis 101.

[0089] The seventh lens L7 has a negative refractive power. The object-side surface S13 is convex near the optical axis 101, and the image-side surface S14 is concave near the optical axis 101.

[0090] In addition, the optical system 10 also includes an adjustable aperture STO, an IR filter, and an imaging surface IMG.

[0091] In this embodiment, the adjustable aperture STO is disposed on the object-side surface S1 of the first lens L1 of the optical system 10 to control the amount of light entering the system. Figure 1 , Figure 3 , Figure 5 and Figure 7 Schematic diagrams of the optical system 10 with the adjustable aperture STO in four different states are shown. When the adjustable aperture STO is in four different states, the optical system 10 can have different aperture numbers. Therefore, for ease of description of the four states of the adjustable aperture STO, [the diagrams are then presented]. Figure 1 The adjustable aperture STO in the shown state is called the aperture of the optical system 10 in the first aperture state. Figure 3 The adjustable aperture STO in the shown state is called the aperture of the optical system 10 in the second aperture state. Figure 5 The adjustable aperture STO shown in the diagram is called the aperture of the optical system 10 in the third aperture state. Figure 7 The adjustable aperture STO in the shown state is called the aperture of the optical system 10 in the fourth aperture state. It can be understood that the adjustable aperture STO includes, but is not limited to, these four states. By adjusting the distance A from the adjustable aperture STO to the object side surface S1 of the first lens L1 and the opening size of the adjustable aperture STO, the adjustable aperture STO can also have other different states so that the optical system 10 can obtain different aperture numbers.

[0092] An infrared cutoff filter (IR) is positioned between the seventh lens (L7) and the imaging surface (IMG). It includes an object-side surface (S15) and an image-side surface (S16). The IR is an infrared cutoff filter used to filter out infrared light, ensuring that only visible light (wavelength 380nm-780nm) enters the imaging surface (IMG). The IR is made of glass (or plastic), with a coating on its surface. Lenses L1 through L7 are made of plastic (or plastic-glass). The effective pixel area of ​​the image sensor is located on the imaging surface (IMG). The image sensor captures different wavelengths of information about the object for subsequent processing.

[0093] Table 1a shows the parameters of the optical system 10 in this embodiment, with the positive direction from the object side to the image side. The Y-radius is the radius of curvature of the corresponding surface number along the optical axis 101. In the same lens element, the surface with the smaller surface number is the object side, and vice versa. The value in the "thickness" parameter column is the distance from the current surface to the next surface along the optical axis 101. The focal length, material refractive index, and Abbe number all use 555.0 nm as the reference wavelength. The units for Y-radius, thickness, and focal length are millimeters (mm).

[0094] Table 1a

[0095]

[0096]

[0097] Table 1b

[0098]

[0099] Wherein, EFL is the effective focal length of optical system 10, FNO is the aperture number of optical system 10, FOV (°) is the maximum field of view of optical system 10, TTL is the distance from the object side surface S1 of the first lens L1 to the imaging surface IMG on the optical axis 101, i.e., the total optical length, and A is the distance from the aperture stop STO to the object side surface S1 of the first lens L1 in a direction parallel to the optical axis 101.

[0100] In this embodiment, the object-side surface and image-side surface of the first lens L1 to the seventh lens L7 are both aspherical. The surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0101]

[0102] Where x is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspherical surface to the optical axis 101, c is the curvature of the vertex of the aspherical surface, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th higher-order term in the aspherical surface shape formula. Table 1 gives the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 of the aspherical mirrors S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S13, and S14 that can be used in the first embodiment.

[0103] Table 1c

[0104]

[0105]

[0106] Figure 2 (First aperture setting) Figure 4 (Second aperture state) Figure 6 (Third aperture state) Figure 8 (Fourth aperture state) respectively shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system 10 in each aperture state in the first embodiment.

[0107] In the longitudinal spherical aberration curve, the horizontal axis represents the focal point offset (mm), which is the distance from the imaging plane IMG to the intersection of the ray and the optical axis 101, and the vertical axis represents the normalized field of view. It can be seen that the focal point deviation of each wavelength of light in the first embodiment is low, and the blur spots or halos are effectively suppressed, indicating that the optical system 10 in this embodiment has high imaging quality.

[0108] In the astigmatism curve diagram, the horizontal axis represents the focal point offset (mm), which is the distance from the imaging plane to the intersection of the IMG ray and the optical axis 101, and the vertical axis represents the image height (mm). It can be seen that in the first embodiment, the sagittal (S) and meridional (T) converging focal points deviate from the image plane to a low degree, and the difference between the two is small. Astigmatism and field curvature are suppressed, indicating that the optical system 10 in this embodiment has high imaging quality.

[0109] In the distortion curve graph, the horizontal axis represents the distortion (%) and the vertical axis represents the image height (mm). It can be seen that the distortion degree of the reference wavelength light in the first embodiment is low, and the imaging distortion is effectively suppressed, indicating that the imaging quality of the optical system 10 in this embodiment is high.

[0110] Second Embodiment

[0111] Please see Figure 9 In this embodiment, the optical system 10, along the optical axis 101 from the object side to the image side, includes, in sequence:

[0112] The first lens L1 has positive refractive power, the object side S1 is convex near the optical axis 101, and the image side S2 is concave near the optical axis 101.

[0113] The second lens L2 has a negative refractive power, the object side S3 is convex near the optical axis 101, and the image side S4 is concave near the optical axis 101.

[0114] The third lens L3 has a negative refractive power, the object side S5 is concave near the optical axis 101, and the image side S6 is convex near the optical axis 101.

[0115] The fourth lens L4 has positive refractive power. The object-side surface S7 is convex near the optical axis 101, and the image-side surface S8 is concave near the optical axis 101.

[0116] The fifth lens L5 has a negative refractive power. The object-side surface S9 is convex near the optical axis 101, and the image-side surface S10 is concave near the optical axis 101.

[0117] The sixth lens L6 has positive refractive power. The object side S11 is convex near the optical axis 101, and the image side S12 is concave near the optical axis 101.

[0118] The seventh lens L7 has a negative refractive power. The object-side surface S13 is convex near the optical axis 101, and the image-side surface S14 is concave near the optical axis 101.

[0119] In addition, the optical system 10 also includes an adjustable aperture STO, an IR filter, and an imaging surface IMG.

[0120] In this embodiment, the settings of the adjustable aperture STO, filter IR, and imaging plane IMG are largely the same as in the first embodiment, and can be referred to Embodiment 1, so they will not be repeated here. Other differences are detailed in the list.

[0121] Table 2a

[0122]

[0123] Table 2b

[0124]

[0125] Table 2c gives the higher-order coefficients that can be used for each aspherical mirror in the second embodiment, wherein each aspherical surface shape can be defined by the formula given in the first embodiment.

[0126]

[0127]

[0128] Figure 10 (In the first aperture state) are shown the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system 10 of the second embodiment. As can be seen from the figures, the longitudinal spherical aberration, field curvature, and distortion of the optical system 10 are well controlled, thus the optical system 10 of this embodiment has good imaging quality. Considering that reducing the aperture can improve image quality without triggering the diffraction limit, the imaging quality of the optical system 10 of the second embodiment is also excellent in other aperture states.

[0129] Third Embodiment

[0130] Please see Figure 11 In this embodiment, the optical system 10, along the optical axis 101 from the object side to the image side, includes, in sequence:

[0131] The first lens L1 has positive refractive power, the object side S1 is convex near the optical axis 101, and the image side S2 is concave near the optical axis 101.

[0132] The second lens L2 has a negative refractive power, the object side S3 is convex near the optical axis 101, and the image side S4 is concave near the optical axis 101.

[0133] The third lens L3 has positive refractive power, the object side S5 is convex near the optical axis 101, and the image side S6 is concave near the optical axis 101.

[0134] The fourth lens L4 has a negative refractive power. The object-side surface S7 is convex near the optical axis 101, and the image-side surface S8 is concave near the optical axis 101.

[0135] The fifth lens L5 has a negative refractive power. The object-side surface S9 is convex near the optical axis 101, and the image-side surface S10 is concave near the optical axis 101.

[0136] The sixth lens L6 has positive refractive power. The object side S11 is convex near the optical axis 101, and the image side S12 is convex near the optical axis 101.

[0137] The seventh lens L7 has a negative refractive power. The object-side surface S13 is convex near the optical axis 101, and the image-side surface S14 is concave near the optical axis 101.

[0138] In addition, the optical system 10 also includes an adjustable aperture STO, an IR filter, and an imaging surface IMG.

[0139] In this embodiment, the settings of the adjustable aperture STO, filter IR, and imaging plane IMG are largely the same as in the first embodiment, and can be referred to Embodiment 1, so they will not be repeated here. Other differences are detailed in the list.

[0140] Table 3a

[0141]

[0142]

[0143] Table 3b

[0144]

[0145] Table 3c gives the higher-order coefficients that can be used for each aspherical mirror in the third embodiment, wherein each aspherical surface shape can be defined by the formula given in the first embodiment.

[0146]

[0147]

[0148] Figure 12 (In the first aperture state) are shown the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system 10 of the third embodiment. As can be seen from the figures, the longitudinal spherical aberration, field curvature, and distortion of the optical system 10 are well controlled, thus the optical system 10 of this embodiment has good imaging quality. Considering that reducing the aperture can improve image quality without triggering the diffraction limit, the optical system 10 of the third embodiment also has excellent imaging quality in other aperture states.

[0149] Fourth embodiment

[0150] Please see Figure 13 In this embodiment, the optical system 10, along the optical axis 101 from the object side to the image side, includes, in sequence:

[0151] The first lens L1 has positive refractive power, the object side S1 is convex near the optical axis 101, and the image side S2 is concave near the optical axis 101.

[0152] The second lens L2 has a negative refractive power, the object side S3 is concave near the optical axis 101, and the image side S4 is convex near the optical axis 101.

[0153] The third lens L3 has positive refractive power, the object side S5 is convex near the optical axis 101, and the image side S6 is convex near the optical axis 101.

[0154] The fourth lens L4 has a negative refractive power. The object-side surface S7 is convex near the optical axis 101, and the image-side surface S8 is concave near the optical axis 101.

[0155] The fifth lens L5 has a negative refractive power. The object-side surface S9 is convex near the optical axis 101, and the image-side surface S10 is concave near the optical axis 101.

[0156] The sixth lens L6 has positive refractive power. The object side S11 is convex near the optical axis 101, and the image side S12 is concave near the optical axis 101.

[0157] The seventh lens L7 has a negative refractive power. The object-side surface S13 is convex near the optical axis 101, and the image-side surface S14 is concave near the optical axis 101.

[0158] In addition, the optical system 10 also includes an adjustable aperture STO, an IR filter, and an imaging surface IMG.

[0159] In this embodiment, the settings of the adjustable aperture STO, filter IR, and imaging plane IMG are largely the same as in the first embodiment, and can be referred to Embodiment 1, so they will not be repeated here. Other differences are detailed in the list.

[0160] Table 4a

[0161]

[0162]

[0163] Table 4b

[0164]

[0165] Table 4c gives the higher-order coefficients that can be used for each aspherical mirror in the fourth embodiment, wherein each aspherical surface shape can be defined by the formula given in the first embodiment.

[0166]

[0167]

[0168] Figure 14 (In the first aperture state) the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system 10 of the fourth embodiment are shown respectively. As can be seen from the figures, the longitudinal spherical aberration, field curvature, and distortion of the optical system 10 are well controlled, thus the optical system 10 of this embodiment has good imaging quality. Considering that reducing the aperture can improve image quality without triggering the diffraction limit, the imaging quality of the optical system 10 of the fourth embodiment is also excellent in other aperture states.

[0169] Fifth embodiment

[0170] Please see Figure 15 In this embodiment, the optical system 10, along the optical axis 101 from the object side to the image side, includes, in sequence:

[0171] The first lens L1 has positive refractive power, the object side S1 is convex near the optical axis 101, and the image side S2 is concave near the optical axis 101.

[0172] The second lens L2 has a negative refractive power, the object side S3 is convex near the optical axis 101, and the image side S4 is concave near the optical axis 101.

[0173] The third lens L3 has positive refractive power, the object side S5 is convex near the optical axis 101, and the image side S6 is convex near the optical axis 101.

[0174] The fourth lens L4 has a negative refractive power. The object-side surface S7 is convex near the optical axis 101, and the image-side surface S8 is concave near the optical axis 101.

[0175] The fifth lens L5 has a negative refractive power. The object-side surface S9 is concave near the optical axis 101, and the image-side surface S10 is concave near the optical axis 101.

[0176] The sixth lens L6 has positive refractive power. The object side S11 is convex near the optical axis 101, and the image side S12 is convex near the optical axis 101.

[0177] The seventh lens L7 has a negative refractive power. The object-side surface S13 is convex near the optical axis 101, and the image-side surface S14 is concave near the optical axis 101.

[0178] In addition, the optical system 10 also includes an adjustable aperture STO, an IR filter, and an imaging surface IMG.

[0179] In this embodiment, the settings of the adjustable aperture STO, filter IR, and imaging plane IMG are largely the same as in the first embodiment, and can be referred to Embodiment 1, so they will not be repeated here. Other differences are detailed in the list.

[0180] Table 5a

[0181]

[0182]

[0183] Table 5b

[0184]

[0185] Table 5c gives the higher-order coefficients that can be used for each aspherical mirror in the fifth embodiment, wherein each aspherical surface shape can be defined by the formula given in the first embodiment.

[0186]

[0187]

[0188] Figure 16 (In the first aperture state) the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system 10 of the fifth embodiment are shown respectively. As can be seen from the figures, the longitudinal spherical aberration, field curvature, and distortion of the optical system 10 are well controlled, thus the optical system 10 of this embodiment has good imaging quality. Considering that reducing the aperture can improve image quality without triggering the diffraction limit, the optical system 10 of the fifth embodiment also has excellent imaging quality in other aperture states.

[0189] Sixth Embodiment

[0190] Please see Figure 17 In this embodiment, the optical system 10, along the optical axis 101 from the object side to the image side, includes, in sequence:

[0191] The first lens L1 has positive refractive power, the object side S1 is convex near the optical axis 101, and the image side S2 is concave near the optical axis 101.

[0192] The second lens L2 has a negative refractive power, the object side S3 is convex near the optical axis 101, and the image side S4 is concave near the optical axis 101.

[0193] The third lens L3 has positive refractive power, the object side S5 is convex near the optical axis 101, and the image side S6 is concave near the optical axis 101.

[0194] The fourth lens L4 has a negative refractive power. The object-side surface S7 is convex near the optical axis 101, and the image-side surface S8 is concave near the optical axis 101.

[0195] The fifth lens L5 has a negative refractive power. The object-side surface S9 is convex near the optical axis 101, and the image-side surface S10 is concave near the optical axis 101.

[0196] The sixth lens L6 has positive refractive power. The object side S11 is convex near the optical axis 101, and the image side S12 is concave near the optical axis 101.

[0197] The seventh lens L7 has a negative refractive power. The object-side surface S13 is convex near the optical axis 101, and the image-side surface S14 is concave near the optical axis 101.

[0198] In addition, the optical system 10 also includes an adjustable aperture STO, an IR filter, and an imaging surface IMG.

[0199] In this embodiment, the settings of the adjustable aperture STO, filter IR, and imaging plane IMG are largely the same as in the first embodiment, and can be referred to Embodiment 1, so they will not be repeated here. Other differences are detailed in the list.

[0200] Table 6a

[0201]

[0202] Table 6b

[0203]

[0204] Table 6c gives the higher-order coefficients that can be used for each aspherical mirror in the sixth embodiment, wherein each aspherical surface shape can be defined by the formula given in the first embodiment.

[0205]

[0206] Figure 18(In the first aperture state) the longitudinal spherical aberration curve, astigmatism curve, and distortion curve of the optical system 10 of the sixth embodiment are shown respectively. As can be seen from the figures, the longitudinal spherical aberration, field curvature, and distortion of the optical system 10 are well controlled, thus the optical system 10 of this embodiment has good imaging quality. Considering that reducing the aperture can improve image quality without triggering the diffraction limit, the imaging quality of the optical system 10 of the sixth embodiment is also excellent in other aperture states.

[0207] Table 7 shows the values ​​of several relationships in the optical systems of the first to sixth embodiments.

[0208] Table 7

[0209] formula Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 FOV 86° 84.6° 87.6° 86° 88.7° 81.9° FOV / (FNOmax-FNOmin) 35.1020 34.8148 36.5000 36.1345 37.5847 34.8511 TTL / ImgH 1.2439 1.2806 1.2132 1.2659 1.2185 1.2806 f1 / f 1.1694 1.1455 1.2781 1.1783 1.3177 1.1230 f2 / f -4.2313 -6.1181 -7.0739 -5.4049 -8.0207 -4.5373 |f3| / f 3.7484 29.1755 5.0995 4.1437 5.2515 4.0257 |f4| / f 6.5482 34.4829 7.7121 5.8585 7.8957 4.6048 f5 / f -2.0570 -1.9601 -2.0065 -2.0665 -1.8518 -2.2562 f / f6 1.4063 1.4329 1.4329 1.3873 1.4600 1.4047 f / f7 -1.2570 -1.2577 -1.2383 -1.2385 -1.1916 -1.3220 f / R1 2.4709 2.3729 2.4539 2.4212 2.4011 2.5346 R2 / f 1.0588 1.3989 0.9879 1.0971 1.0013 1.0430 |R3| / f 1.6437 1.1174 1.1339 3.6912 1.1240 1.5457 |R4| / f 1.0430 0.8716 0.9073 234.1646 0.9204 1.0260 |R5| / f 1.9205 12.5468 2.2366 3.1541 3.5663 1.5725 |R6| / f 30.6694 59.1515 11.2488 7.9408 14.5431 5.4600 R7 / f 3.2608 1.6934 2.1860 3.1220 2.3161 3.7429 R8 / f 1.8844 1.7939 1.5344 1.7498 1.6101 1.7113 |R9| / f 32.2117 57.4713 222.9694 30.3854 134.3480 11.6198 R10 / f 1.2176 1.0955 1.1376 1.1330 1.0638 1.1551 R11 / f 2.5493 2.6665 2.6101 2.5702 2.6604 2.5879 |R12| / f 35.6461 21.4515 65.7703 30.8245 68.5509 59.7593 f / R13 1.3588 1.3346 1.3008 1.3375 1.2767 1.3794 f / R14 3.7892 3.7664 3.6929 3.7366 3.5812 3.9205 (R11+R12) / (R11-R12) -0.978 -1.036 -0.988 -1.026 -0.989 -1.013 f12 / f 1.48359 1.32539 1.47219 1.42909 1.4957 1.37813 |f34| / f 8.24588 175.21 13.8555 12.836 14.5533 24.7104 |f567| / f 30.8453 1450.34 45.0157 33.7463 17.1963 24.0002 TTL / f 1.1947 1.2011 1.1928 1.2095 1.2282 1.1666 ImgH / f 0.960 0.938 0.983 0.955 1.008 0.911 DL / TTL 0.792 0.806 0.797 0.802 0.790 0.807 f7 / SAG71 5.548 4.713 4.397 5.196 4.372 4.620 f7 / SAG72 -22.193 -20.087 -21.622 -20.177 -21.407 -23.066 (SAG71+SAG72) / CT7 -1.523 -1.781 -1.996 -1.553 -2.015 -2.083 Yc62 / SD62 0.554 0.611 0.605 0.595 0.620 0.558 Yc72 / SD72 0.382 0.376 0.378 0.404 0.398 0.362 CT1 / CT2 3.869 4.185 3.764 4.431 3.532 4.516 CT3 / CT2 1.80085 1.52183 1.55207 1.87091 1.55025 1.32589 CT4 / CT3 0.793 1.057 0.940 0.944 0.930 1.275 CT6 / CT5 1.149 2.023 1.963 1.644 2.311 1.144 CT6 / CT7 1.21054 1.25339 1.2697 1.21197 1.32332 1.28616 (CT1+CT2) / (CT3+CT4+CT5) 0.96686 1.21957 1.14717 1.08007 1.13273 1.1417 AT23 / (AT12+AT34) 0.486 1.086 0.520 0.309 0.600 0.539 T61 / CT6 2.124 1.879 2.044 1.992 1.936 2.132 AT67max / AT67min 21.461 24.527 37.414 36.210 40.302 24.786 ET7 / ET6 1.022 1.109 0.921 0.998 0.927 0.816 ET7 / CT7 0.857 0.986 0.783 1.018 0.866 0.846

[0210] Please see Figure 19 This application also provides a camera module 20, which includes a photosensitive chip 21 and an optical system 10 as described in any embodiment of the first aspect. The photosensitive chip 21 is disposed on the image side of the optical system 10. The photosensitive surface of the photosensitive chip 21 is located on the imaging surface of the optical system 10, and light rays from an object passing through a lens and incident on the photosensitive surface can be converted into electrical signals for an image. The photosensitive chip 21 can be a complementary metal-oxide-semiconductor (CMOS) or a charge-coupled device (CCD). The camera module 20 can be an imaging module integrated into an electronic device or a standalone lens. By incorporating the optical system 10 provided in this application into the camera module 20, the surface shape and refractive power of each lens in the optical system 10 can be rationally designed, enabling the camera module 20 to achieve miniaturization, good imaging performance, and adjustable aperture characteristics.

[0211] Please see Figure 20 This application also provides an electronic device 30, which includes a housing 31 and the aforementioned camera module 20, with the camera module 20 disposed within the housing 31. The electronic device 30 includes, but is not limited to, smartphones, computers, and smartwatches. By incorporating the camera module 20 provided by this invention into the electronic device 30, the electronic device 30 achieves miniaturization, good imaging performance, and adjustable aperture characteristics.

[0212] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the spirit and scope of the technical solutions of this application.

Claims

1. An optical system, characterized in that, There are a total of seven lenses with refractive power, which successively include from the object side to the image side along the optical axis: An adjustable aperture for adjusting the aperture size; A first lens with positive refractive power, the object side is convex near the optical axis, and the image side is concave near the optical axis; A second lens with negative refractive power; A third lens with refractive power; A fourth lens with refractive power, the object side is convex near the optical axis, and the image side is concave near the optical axis; A fifth lens with negative refractive power, the image side is concave near the optical axis; A sixth lens with positive refractive power, the object side is convex near the optical axis; A seventh lens with negative refractive power, the object side is convex near the optical axis, and the image side is concave near the optical axis; The optical system satisfies the following relationships: 80° < FOV < 90°; 33 < FOV / (FNOmax - FNOmin) < 38; 1.2 < TTL / ImgH < 1.3; Where, FOV is the maximum field angle of the optical system, FNOmax is the maximum f-number of the optical system, FNOmin is the minimum f-number of the optical system, 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 angle of the optical system.

2. The optical system as described in claim 1, characterized in that, The optical system satisfies the following relationships: 1.1 < f1 / f < 1.4, and / or -9 < f2 / f < -4, and / or 3 < |f3| / f, and / or 4 < |f4| / f, and / or -2.3 < f5 / f < -1.8, and / or 1.3 < f / f6 < 1.5, and / or -1.4 < f / f7 < -1.1; Where, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, f7 is the effective focal length of the seventh lens, and f is the effective focal length of the optical system.

3. The optical system as described in claim 1, characterized in that, The optical system satisfies the following relationships: 2.3 < f / R1 < 2.6, and / or 0.9 < R2 / f < 1.5, and / or 1.1 < |R3| / f < 3.8, and / or 0.8 < |R4| / f, and / or 1.5 < |R5| / f < 13, and / or 5 < |R6| / f, and / or 1.5 < R7 / f < 3.9, and / or 1.45 < R8 / f < 1.95, and / or 11 < |R9| / f, and / or 1 < R10 / f < 1.3, and / or 2.5 < R11 / f < 2.7, and / or 20 < |R12| / f, and / or 1.2 < f / R13 < 1.4, and / or 3.5 < f / R14 < 4; and / or -1.1 < (R11 + R12) / (R11 - R12) < -0.9; Where, R1 is the curvature radius of the object side of the first lens on the optical axis, R2 is the curvature radius of the image side of the first lens on the optical axis, R3 is the curvature radius of the object side of the second lens on the optical axis, R4 is the curvature radius of the image side of the second lens on the optical axis, R5 is the curvature radius of the object side of the third lens on the optical axis, R6 is the curvature radius of the image side of the third lens on the optical axis, R7 is the curvature radius of the object side of the fourth lens on the optical axis, R8 is the curvature radius of the image side of the fourth lens on the optical axis, R9 is the curvature radius of the object side of the fifth lens on the optical axis, R10 is the curvature radius of the image side of the fifth lens on the optical axis, R11 is the curvature radius of the object side of the sixth lens on the optical axis, R12 is the curvature radius of the image side of the sixth lens on the optical axis, R13 is the curvature radius of the object side of the seventh lens on the optical axis, R14 is the curvature radius of the image side of the seventh lens on the optical axis, and f is the effective focal length of the optical system.

4. The optical system as claimed in claim 1, characterized in that, The optical system satisfies the following relational expressions: 1.3 < f12 / f < 1.5, and / or 8 < |f34| / f, and / or 16 < |f567| / f; Where, f12 is the combined effective focal length of the first lens and the second lens, f is the effective focal length of the optical system, f34 is the combined effective focal length of the third lens and the fourth lens, and f567 is the combined effective focal length of the fifth lens, the sixth lens and the seventh lens.

5. The optical system as claimed in claim 1, characterized in that, The optical system satisfies the following relational expressions: 1.1 < TTL / f < 1.3, and / or 0.9 < ImgH / f < 1.1, and / or 0.77 < DL / TTL < 0.81; Where, f is the effective focal length of the optical system, and DL is the distance on the optical axis from the object side of the first lens to the image side of the seventh lens.

6. The optical system as claimed in claim 1, characterized in that, The optical system satisfies the following relational expressions: 4.3 < f7 / SAG71 < 5.6, and / or -24 < f7 / SAG72 < -19, and / or -2.1 < (SAG71 + SAG72) / CT7 < -1.4; Where, f7 is the effective focal length of the seventh lens, SAG71 is the sagitta at the maximum effective aperture of the object side of the seventh lens, SAG72 is the sagitta at the maximum effective aperture of the image side of the seventh lens, and CT7 is the thickness of the seventh lens on the optical axis.

7. The optical system as claimed in claim 1, characterized in that, The optical system satisfies the following conditional expressions: 0.5 < Yc62 / SD62 < 0.65, and / or 0.34 < Yc72 / SD72 < 0.42; Where, Yc62 is the vertical height from the off-axis vertex of the image side of the sixth lens to the optical axis, SD62 is the maximum effective aperture of the image side of the sixth lens, Yc72 is the vertical height from the off-axis vertex of the image side of the seventh lens to the optical axis, and SD72 is the maximum effective aperture of the image side of the seventh lens.

8. The optical system as claimed in claim 1, characterized in that, The optical system satisfies the following conditional expressions: 3.5 < CT1 / CT2 < 4.6, and / or 1.3 < CT3 / CT2 < 1.9, and / or 0.7 < CT4 / CT3 < 1.3, and / or 1.1 < CT6 / CT5 < 2.4, and / or 1.2 < CT6 / CT7 < 1.4, and / or 0.9 < (CT1 + CT2) / (CT3 + CT4 + CT5) < 1.3, and / or 0.3 < AT23 / (AT12 + AT34) < 1.1, and / or 1.8 < T61 / CT6 < 2.2, and / or 20 < AT67max / AT67min < 41, and / or 0.8 < ET7 / ET6 < 1.2, and / or 0.7 < ET7 / CT7 < 1.1; Wherein, AT23 is the distance on the optical axis from the image side of the second lens to the object side of the third lens, AT12 is the distance on the optical axis from the image side of the first lens to the object side of the second lens, AT34 is the distance on the optical axis from the image side of the third lens to the object side of the fourth lens, T61 is the distance on the optical axis from the maximum effective aperture of the object side of the sixth lens to the image side of the sixth lens, AT67max is the maximum interval on the optical axis between the sixth lens and the seventh lens, AT67min is the minimum interval on the optical axis between the sixth lens and the seventh lens, ET6 is the distance in the optical axis direction from the maximum effective aperture of the object side of the sixth lens to the maximum effective aperture of the image side of the sixth lens, ET7 is the distance in the optical axis direction from the maximum effective aperture of the object side of the seventh lens to the maximum effective aperture of the image side of the seventh lens, CTn is the thickness of the nth lens on the optical axis, and n is a natural number less than or equal to 7.

9. A camera module, characterized in that, Comprising: The optical system according to any one of claims 1 to 8; And A photosensitive chip, located on the image side of the optical system.

10. An electronic device, characterized in that, Comprising: A housing; And The imaging module according to claim 9, the imaging module being disposed in the housing.

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