An ultra-wide-angle small-aperture ultra-thin optical system and an application camera module thereof

Abstract

The application discloses an ultra-wide-angle small-caliber ultrathin optical system and an applied camera module, which are mainly composed of six lenses. Through reasonable distribution of optical powers and optimization selection of high-order aspherical surface parameters, the camera module can realize miniaturization, has small head, and has the functions of ultra-wide-angle shooting, miniaturization, ultrathin, compact structure, and is convenient for processing and installation. In addition, the camera module has good imaging resolving power.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical imaging systems, and specifically discloses an ultra-wide-angle small-aperture ultra-thin optical system applied to a head-mounted device and a camera module using the same. BACKGROUND

[0002] With the rapid development of modern technology, various intelligent terminal devices (including digital cameras, smart phones, etc.) are rapidly developing and popularizing, and the optical lenses in the key components thereof are also developing more diversely, not only pursuing thinness but also having good imaging quality, and more pursuing wide-angle shooting function. Especially with the development of full-screen and under-screen technology, small-head camera modules have emerged. However, the field of view of the lens of most small-head camera modules at present is not large enough, and the overall thinness is not good enough, which cannot meet the requirements of small design. SUMMARY

[0003] In order to overcome the problems of the existing optical system or camera module applied to a head-mounted device, such as insufficient field of view, poor overall thinness, and inability to meet the requirements of small design, the present application discloses an ultra-wide-angle small-aperture ultra-thin optical system, which can realize miniaturization while considering small head and ultra-wide-angle shooting function through reasonable distribution of optical power and optimization of high-order aspherical surface parameters.

[0004] An ultra-wide-angle small-aperture ultra-thin optical system comprises, in order along the optical axis from the object plane to the image plane, a first lens, a diaphragm, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens.

[0005] The object plane side of the first lens is concave, and the optical power thereof is negative.

[0006] The object plane side of the second lens is convex, the image plane side thereof is convex, and the optical power thereof is positive.

[0007] The third lens has optical power.

[0008] The fourth lens has optical power.

[0009] The fifth lens has optical power.

[0010] The object plane side of the sixth lens is convex, the image plane side thereof is concave, and the sixth lens has optical power.

[0011] Further, the optical system satisfies the following conditions:

[0012] 87<FOV / (TTL / IamgH / DT11)<100;

[0013] Wherein, FOV is the maximum field of view angle of the optical system, TTL is the on-axis distance from the object side surface of the first lens to the imaging surface, ImgH is half of the diagonal length of the effective pixel area on the imaging surface, DT11 is the maximum effective radius of the object side surface of the first lens.

[0014] Further, the optical system satisfies the following condition:

[0015] 0.7 < (f5-f6) / f5 < 3.2;

[0016] Wherein, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens.

[0017] Further, the optical system satisfies the following condition:

[0018] 1.2 < |R8| / R2 < 3.8;

[0019] Wherein, R2 is the curvature radius of the image side surface of the first lens, R8 is the curvature radius of the image side surface of the fourth lens.

[0020] Further, the optical system satisfies the following condition:

[0021] -3.3 < R3 / R4 < -1.0;

[0022] Wherein, R3 is the curvature radius of the object side surface of the second lens, R4 is the curvature radius of the image side surface of the second lens.

[0023] Further, the optical system satisfies the following condition:

[0024] 0 < R12 / R11 + |SAG12 / SAG11| < 1.2;

[0025] Wherein, R11 is the curvature radius of the object side surface of the sixth lens, R12 is the curvature radius of the image side surface of the sixth lens, SAG11 is the distance from the maximum effective aperture of the object side surface of the sixth lens to the intersection point of the object side surface of the sixth lens and the optical axis in the direction parallel to the optical axis, SAG12 is the distance from the maximum effective aperture of the image side surface of the sixth lens to the intersection point of the image side surface of the sixth lens and the optical axis in the direction parallel to the optical axis.

[0026] Further, the optical system satisfies the following condition:

[0027] -4.1 < DT52 / SAG10 < -2.1;

[0028] Wherein, DT52 is the maximum effective radius of the image side surface of the fifth lens, SAG10 is the distance from the maximum effective aperture of the image side surface of the fifth lens to the intersection point of the image side surface of the fifth lens and the optical axis in the direction parallel to the optical axis.

[0029] Further, the optical system satisfies the following condition:

[0030] 0.7 < (CT5 + CT6) / T12 < 1.4;

[0031] wherein CT5 is the center thickness of the fifth lens on the optical axis, CT6 is the center thickness of the sixth lens on the optical axis, and T12 is the air gap between the first lens and the second lens on the optical axis.

[0032] Further, the optical system satisfies the following condition:

[0033] 2.3 < ΣCT / ΣAT < 3.0;

[0034] wherein ΣCT is the sum of the center thicknesses of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens on the optical axis, and ΣAT is the sum of the air gaps between adjacent two lenses of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens on the optical axis.

[0035] Further, the optical system satisfies the following condition:

[0036] 0.7 < f12 / f23 < 1.7;

[0037] wherein f12 is the effective combined focal length of the first lens and the second lens, and f23 is the effective combined focal length of the second lens and the third lens.

[0038] Further, the optical system satisfies the following condition:

[0039] 0 < f / R11 < 1.8;

[0040] wherein f is the effective focal length of the optical imaging system, and R11 is the radius of curvature of the object side surface of the sixth lens.

[0041] Further, the optical system satisfies the following condition:

[0042] 1.4 < (DT62 - DT61) / |DT12 - DT11| < 2.4;

[0043] wherein DT11 is the maximum effective radius of the object side surface of the first lens, DT12 is the maximum effective radius of the image side surface of the first lens, DT61 is the maximum effective radius of the object side surface of the sixth lens, and DT62 is the maximum effective radius of the image side surface of the sixth lens.

[0044] Further, the optical system satisfies the following condition:

[0045] 12 < f * tan(HFOV) / T12 < 18;

[0046] Wherein, f is the effective focal length of the optical system, HFOV is half of the maximum field of view angle of the optical system, and T12 is the air gap of the first lens and the second lens on the optical axis.

[0047] Further, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all aspherical lenses.

[0048] Further, the maximum effective radius DT11 of the object side of the first lens satisfies: DT11 < 1.6 mm; the F number of the optical system is 2.4; the full field of view angle FOV of the optical system satisfies: FOV > 168°; and the total optical length TTL of the optical system satisfies: TTL < 5.1 mm.

[0049] In another aspect, the embodiment of the present application also provides a head-mounted camera module, which at least comprises an optical lens, and the optical lens is internally installed with the ultra-wide-angle small-aperture ultra-thin optical system.

[0050] Compared with the prior art, the beneficial effects of the present application are as follows:

[0051] The optical system and the camera module of the embodiment of the present application are mainly composed of six lenses, and through reasonable distribution of optical power and optimized selection of high-order aspherical surface parameters, the small size, small head, ultra-wide-angle shooting function, the advantages of ultra-wide-angle, small size and ultra-thin, compact structure, easy processing and installation, and good imaging resolving power can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows.

[0053] Figure 1 is a structural schematic diagram of the optical system or the camera module of the embodiment 1 of the present application;

[0054] Figure 2 is the on-axis chromatic aberration, astigmatism and distortion curve of the optical system or the camera module of the embodiment 1 of the present application;

[0055] Figure 3 is a structural schematic diagram of the optical system or the camera module of the embodiment 2 of the present application;

[0056] Figure 4 is the on-axis chromatic aberration, astigmatism and distortion curve of the optical system or the camera module of the embodiment 2 of the present application;

[0057] Figure 5 is a structural schematic diagram of the optical system or the camera module of the embodiment 3 of the present application;

[0058] Figure 6is the on-axis chromatic aberration, astigmatism and distortion curve of the optical system or camera module of Embodiment 3 of the present application;

[0059] Figure 7 is a structural schematic diagram of the optical system or camera module of Embodiment 4 of the present application;

[0060] Figure 8 is the on-axis chromatic aberration, astigmatism and distortion curve of the optical system or camera module of Embodiment 4 of the present application;

[0061] Figure 9 is a structural schematic diagram of the optical system or camera module of Embodiment 5 of the present application;

[0062] Figure 10 is the on-axis chromatic aberration, astigmatism and distortion curve of the optical system or camera module of Embodiment 5 of the present application. DETAILED DESCRIPTION

[0063] As shown in Figures 1-10 The present application provides an ultra-wide-angle small-aperture ultra-thin optical system, which sequentially comprises a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and an infrared filter E7 along an optical axis from an object plane to an image plane. The first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5 and the sixth lens E6 are aspherical lenses and are separated by air.

[0064] The object plane side of the first lens E1 is a concave surface, and the optical power thereof is negative.

[0065] The object plane side of the second lens E2 is a convex surface, and the image plane side is a convex surface. The optical power thereof is positive.

[0066] The third lens E3 has an optical power.

[0067] The fourth lens E4 has an optical power.

[0068] The fifth lens E5 has an optical power.

[0069] The object plane side of the sixth lens E6 is a convex surface, and the image plane side is a concave surface. The sixth lens E6 has an optical power.

[0070] Further, the optical system satisfies the following condition: 87 < FOV / (TTL / IamgH / DT11) < 100; wherein FOV is the maximum field of view angle of the optical system, TTL is the on-axis distance from the object side surface of the first lens E1 to the imaging surface, ImgH is half of the diagonal length of the effective pixel area on the imaging surface, and DT11 is the maximum effective radius of the object side surface of the first lens E1, by controlling the ratio range of the maximum field of view angle of the optical system, the on-axis distance from the object side surface of the first lens E1 to the imaging surface, half of the diagonal length of the effective pixel area on the imaging surface, and the maximum effective radius of the object side surface of the first lens E1, the optical system has good thinness while meeting the wide-angle requirement, ensuring that the optical system has the characteristics of ultra-wide angle, miniaturization and thinness; below the lower limit of the relationship, the optical system does not meet the requirements of ultra-wide angle and thinness; above the upper limit of the relationship, the optical system is difficult to obtain good imaging resolution.

[0071] The optical system of the embodiment of the application is mainly composed of six lenses, and by reasonably distributing the focal lengths and optimally selecting the high-order aspherical surface parameters, the optical system can realize miniaturization while considering the small head and ultra-wide-angle shooting functions, has the advantages of ultra-wide angle, miniaturization and ultra-thin, has a compact structure, is convenient for processing and installation, and has good imaging resolution.

[0072] Further, the optical system satisfies the following condition: 0.7 < (f5-f6) / f5 < 3.2; wherein f5 is the effective focal length of the fifth lens E5, and f6 is the effective focal length of the sixth lens E6, by reasonably distributing the ratio of the optical focal lengths of the fifth lens E5 and the sixth lens E6 close to the imaging surface within a reasonable range, the remaining spherical aberration after balancing can balance the spherical aberration generated by the first four lenses, thereby fine-tuning and controlling the spherical aberration of the system and strengthening the accurate control of the on-axis field aberration.

[0073] Further, the optical system satisfies the following condition: 1.2 < |R8| / R2 < 3.8; wherein R2 is the curvature radius of the image side surface of the first lens E1, and R8 is the curvature radius of the image side surface of the fourth lens E4, by limiting the ratio of the curvature radius of the image side surface of the first lens E1 and the curvature radius of the image side surface of the fourth lens E4, the first lens E1 and the fourth lens E4 can present a reasonable surface profile trend, and the light rays in the central field of view and the edge field of view can have good deflection effect and aberration correction ability, so that the aberration of the full field of view is well balanced.

[0074] Further, the optical system satisfies the following condition: -3.3 < R3 / R4 < -1.0; wherein R3 is the curvature radius of the object side surface of the second lens E2, and R4 is the curvature radius of the image side surface of the second lens E2. By controlling the curvature radius of the object side surface and the image side surface of the second lens E2 within a reasonable range, the contributions of the object side surface and the image side surface to the astigmatism can be effectively controlled, and the image quality of the intermediate field and the aperture band can be effectively and reasonably controlled.

[0075] Further, the optical system satisfies the following condition: 0 < R12 / R11 + |SAG12 / SAG11| < 1.2; wherein R11 is the curvature radius of the object side surface of the sixth lens E6, R12 is the curvature radius of the image side surface of the sixth lens E6, SAG11 is the distance from the maximum effective aperture of the object side surface of the sixth lens E6 to the intersection of the object side surface of the sixth lens E6 and the optical axis in the direction parallel to the optical axis, and SAG12 is the distance from the maximum effective aperture of the image side surface of the sixth lens E6 to the intersection of the image side surface of the sixth lens E6 and the optical axis in the direction parallel to the optical axis. By restricting the range of the above sub-formula, the shape of the sixth lens E6 can be limited to reduce the complexity of the surface shape of the sixth lens E6, improve the machinability of the sixth lens E6, correct the astigmatism of the optical system, and reduce the risk of ghost images of the sixth lens E6, thereby improving the imaging quality of the optical system.

[0076] Further, the optical system satisfies the following condition: -4.1 < DT52 / SAG10 < -2.1; wherein DT52 is the maximum effective radius of the image side surface of the fifth lens E5, and SAG10 is the distance from the maximum effective aperture of the image side surface of the fifth lens E5 to the intersection of the image side surface of the fifth lens E5 and the optical axis in the direction parallel to the optical axis. By making the optical system satisfy the above relationship, the surface shape of the image side surface of the fifth lens E5 can be prevented from being excessively bent, thereby reducing the machining difficulty of the fifth lens E5. If the relationship is below the lower limit, the maximum effective aperture of the image side surface of the fifth lens E5 is too small, which is not conducive to the incidence of large-angle light into the optical system, and reduces the imaging range of the optical system. If the relationship exceeds the upper limit, the image side surface of the fifth lens E5 is too flat, and the optical system has a high risk of ghosting.

[0077] Further, the optical system satisfies the following condition: 0.7 < (CT5+CT6) / T12 < 1.4; wherein CT5 is the center thickness of the fifth lens E5 on the optical axis, CT6 is the center thickness of the sixth lens E6 on the optical axis, and T12 is the air gap of the first lens E1 and the second lens E2 on the optical axis. When the above condition is satisfied, the center thickness of the fifth lens E5 and the sixth lens E6 and the air gap of the first lens E1 and the second lens E2 on the optical axis can be effectively compressed, thereby facilitating the shortening of the total length of the system, realizing miniaturization design, and also facilitating the air gap of the first lens E1 and the second lens E2 on the optical axis not to be too small, so that the light rays smoothly transition through the first lens E1 and the second lens E2, thereby facilitating the correction of the aberration of the system and improving the imaging quality of the system.

[0078] Further, the optical system satisfies the following condition: 2.3 < ΣCT / ΣAT < 3.0; wherein ΣCT is the sum of the center thicknesses of the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, and the sixth lens E6 on the optical axis, and ΣAT is the sum of the air gaps between adjacent two lenses of the first lens E1, the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, and the sixth lens E6 on the optical axis. By limiting the above sub-formula within a reasonable range, the imaging quality can be improved, and the light rays can smoothly transition through each lens during the light transmission process; below the lower limit of the relationship, the light rays of the optical system cannot be effectively controlled, resulting in an increase in the aberration of the optical system and thereby reducing the imaging quality thereof; and above the upper limit of the relationship, the overall thickness of the lens is too large, which is not conducive to the convergence and diffusion of the light rays between the lenses, and will force the lens to change the light ray path with a more curved surface, increasing the difficulty of lens manufacturing.

[0079] Further, the optical system satisfies the following condition: 0.7 < f12 / f23 < 1.7; wherein f12 is the effective combined focal length of the first lens E1 and the second lens E2, and f23 is the effective combined focal length of the second lens E2 and the third lens E3. By limiting the ratio of the combined focal length of the first lens E1 and the second lens E2 to the combined focal length of the second lens E2 and the third lens E3, the optical power of the first lens E1 to the third lens E3 can be reasonably distributed, the aberration change of the central field of view to the edge field of view of the optical system can be effectively limited, the excessive curvature of the effective diameter region of the first lens E1 to the third lens E3 can be avoided, the imaging performance of the optical system can be degraded, and the sensitivity of lens eccentricity and tilt can be suppressed within a good range.

[0080] Further, the optical system satisfies the following condition: 0 < f / R11 < 1.8; wherein f is an effective focal length of the optical imaging system, and R11 is a curvature radius of the object side surface of the sixth lens E6. By causing the optical system to satisfy the above relationship, the degree of curvature of the object side surface of the sixth lens E6 is constrained, more light enters the optical system, and the refractive power of the optical system is reasonably distributed, and the off-axis aberration of the optical system is corrected. If the lower limit of the relationship is exceeded, the focal length of the optical system is too large, which is not conducive to the miniaturization of the optical system, and thus affects the thinness of the entire optical system; if the upper limit of the relationship is exceeded, the curvature radius of the object side surface of the sixth lens E6 is too small, which is not conducive to the correction of aberration.

[0081] Further, the optical system satisfies the following condition: 1.4 < (DT62-DT61) / |DT12-DT11| < 2.4; wherein DT11 is the maximum effective diameter of the object side surface of the first lens E1, DT12 is the maximum effective diameter of the image side surface of the first lens E1, DT61 is the maximum effective diameter of the object side surface of the sixth lens E6, and DT62 is the maximum effective diameter of the image side surface of the sixth lens E6. By constraining the maximum effective diameter ratio of the object side surface and the image side surface of the first lens E1 and the object side surface and the image side surface of the sixth lens E6, the aperture relationship of the first lens E1 and the sixth lens E6 under a large field of view angle can be reasonably controlled, so that the maximum effective diameter of the first lens E1 is kept within a reasonable range and has a small head feature; if the upper limit of the relationship is exceeded, the aperture difference between the first lens E1 and the eighth lens is reduced, which is not conducive to the reduction and compactness of the head of the optical lens. If the lower limit of the relationship is exceeded, the aperture of the first lens E1 is compressed too much, which is not conducive to the improvement of the image quality of the optical lens and the correction of distortion.

[0082] Further, the optical system satisfies the following condition: 12 < f*tan(HFOV) / T12 < 18; wherein f is an effective focal length of the optical system, HFOV is half of the maximum field of view angle of the optical system, and T12 is an air gap of the first lens E1 and the second lens E2 on the optical axis. By reasonably distributing the effective focal length of the optical imaging system, half of the maximum field of view angle of the optical imaging system, and the air gap of the first lens E1 and the second lens E2 on the optical axis, the size of the system is effectively compressed, and the light deflection angle is small.

[0083] Further, the maximum effective radius DT11 of the object side surface of the first lens E1 satisfies: DT11 < 1.6 mm, the F number of the optical system is 2.4; the full field of view FOV of the optical system satisfies: FOV > 168°; the total track length TTL of the optical system satisfies: TTL ≤ 5.1 mm, which can reduce the total track length and effectively miniaturize the lens. The head-mounted optical system configured in the application has the advantages of ultra-wide angle, miniaturization, ultra-thin, compact structure, easy processing and installation, and good imaging resolution.

[0084] Specifically, as a preferred embodiment of the application but not limited, as shown in the drawings, Figures 1-2 In the first embodiment 1, the first lens E1 has a negative focal power, the object side surface S1 is convex, and the image side surface S2 is concave. The second lens E2 has a positive focal power, the object side surface S3 is convex, and the image side surface S4 is convex. The third lens E3 has a negative focal power, the object side surface S5 is convex, and the image side surface S6 is concave. The fourth lens E4 has a positive focal power, the object side surface S7 is convex, and the image side surface S8 is concave. The fifth lens E5 has a positive focal power, the object side surface S9 is convex, and the image side surface S10 is convex. The sixth lens E6 has a negative focal power, the object side surface S11 is convex, and the image side surface S12 is concave. The filter E7 has an object side surface S13 and an image side surface S14. The light from the object sequentially passes through each surface S1 to S14 and finally forms an image on the imaging surface S15. The surface type, curvature radius, thickness and material of each lens are shown in Table 1.

[0085] Table 1: Basic parameters of the optical system of embodiment 1

[0086] Surface No. Surface Type Curvature Radius (mm) Thickness (mm) Material OBJ Spherical Infinite 300 S1 Q-Asphere 800.0000 0.4000 1.77,49.50 S2 Q-Asphere 1.5000 1.0059 STO Spherical Infinite 0.0110 S3 Q-Asphere 3.9543 0.6979 1.54,55.77 S4 Q-Asphere -1.4301 0.0300 S5 Q-Asphere 3.9883 0.3000 1.66,20.38 S6 Q-Asphere 1.3894 0.0300 S7 Q-Asphere 1.3344 0.5545 1.54,55.77 S8 Q-Asphere 4.6540 0.0300 S9 Q-Asphere 2.0911 0.5830 1.54,55.77 S10 Q-Asphere -3.0876 0.0500 S11 Q-Asphere 1.1535 0.3500 1.66,20.38 S12 Q-Asphere 0.7602 0.2641 S13 Q-Asphere Spherical 0.2100 1.52,64.17 S14 Infinite Spherical 0.5895 S15 Infinite Spherical

[0087] In Table 1, the object side surface and the image side surface of any one of the first lens E1 to the sixth lens E6 are Q type aspheric surfaces, and the surface type of each aspheric lens can be defined by the following aspheric surface formula, but not limited to:

[0088]

[0089] Wherein, Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the surface vertex, r is the radial coordinate of the aspheric surface, c is the curvature of the aspheric surface vertex, K is the conic coefficient, Am is the aspheric coefficient, rmax is the maximum radial coordinate, and u = r / rmax. Table 2 shows the conic coefficients and high order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28 and A30 of the aspheric surfaces that can be used in embodiment 1.

[0090] Table 2: Aspheric surface related values of the lens surface of embodiment 1

[0091] Infinite S1 S2 S3 S4 S5 S6 K 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 A4 4.08E-01 1.93E-01 -1.48E-02 -1.23E-01 -8.51E-02 -1.55E-01 A6 -7.31E-02 2.20E-03 -7.84E-04 -1.02E-03 9.32E-03 4.32E-04 A8 1.34E-02 -1.89E-04 3.40E-04 -1.42E-03 1.84E-03 -4.67E-03 A10 -6.99E-03 -2.68E-03 3.47E-04 -8.77E-04 -7.93E-04 -1.54E-04 A12 1.89E-03 -1.11E-03 2.87E-04 2.12E-04 5.64E-04 -1.71E-04 A14 -4.36E-04 -1.37E-04 1.84E-04 -3.24E-04 -2.67E-04 1.45E-04 A16 1.30E-04 6.17E-05 1.12E-04 -2.30E-05 1.58E-04 1.30E-04 A18 -1.10E-05 3.51E-05 4.81E-05 -6.72E-05 -1.98E-05 1.64E-04 A20 3.30E-05 4.01E-05 1.97E-05 -1.74E-05 2.29E-05 3.59E-05 A22 8.53E-06 -1.60E-06 2.66E-06 -5.91E-06 -1.28E-06 -2.75E-07 A24 -1.62E-05 2.28E-06 3.08E-06 1.07E-06 -1.09E-06 -5.17E-07 A26 -7.83E-06 -1.04E-06 4.37E-07 3.04E-08 -4.87E-07 -6.38E-07 A28 1.37E-06 -4.59E-07 1.19E-06 3.56E-07 -8.39E-07 9.94E-07 A30 3.27E-06 -2.06E-07 -1.86E-06 -1.89E-07 1.56E-06 3.44E-07 Surface No. S7 S8 S9 S10 S11 S12 K -2.10E+01 1.04E+01 -4.23E+00 -3.12E+00 -2.83E+01 -1.62E+00 A4 1.18E-02 -2.48E-01 -2.15E-01 -1.02E-01 -6.85E-01 -1.27E+00 A6 -6.06E-03 1.25E-02 -7.84E-02 -1.47E-02 4.20E-01 1.53E+00 A8 -1.93E-03 2.28E-02 2.42E-02 3.35E-02 -1.55E-01 1.32E-01 A10 -1.01E-04 -2.56E-03 2.38E-03 9.70E-03 2.27E-02 8.13E-02 A12 3.01E-04 2.07E-03 4.29E-03 -1.70E-02 3.24E-02 -9.37E-02 A14 3.17E-04 2.88E-04 1.39E-03 2.27E-03 -2.46E-02 2.74E-02 A16 5.48E-04 -5.39E-04 -6.99E-04 -4.50E-03 7.71E-03 5.13E-02 A18 3.57E-04 -1.17E-04 -5.15E-04 3.99E-04 6.94E-03 2.86E-02 A20 1.47E-04 -8.81E-05 -2.41E-04 -6.40E-05 -4.01E-03 5.28E-03 A22 7.61E-07 7.91E-08 1.36E-05 7.52E-07 -2.13E-05 1.27E-04 A24 2.13E-06 3.53E-06 7.38E-07 -1.14E-05 6.32E-06 -1.36E-04 A26 -3.79E-07 -6.42E-06 -2.26E-06 1.61E-05 2.66E-05 7.01E-05 A28 -1.64E-06 -2.04E-06 3.55E-06 -1.63E-06 -1.47E-05 1.67E-05 A30 5.55E-09 -1.86E-06 -3.31E-06 -2.00E-05 -3.55E-05 -7.30E-05

[0092] Surface No. The on-axis chromatic aberration, astigmatism and distortion curves of the optical system of Example 1 are shown. The on-axis chromatic aberration represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens; the astigmatism represents the meridional image surface curvature and sagittal image surface curvature; the distortion represents the distortion size values corresponding to different image heights. From the curves, it can be seen that the optical system given by Example 1 can achieve good imaging quality. Figure 2

[0093] Specifically, as a preferred embodiment of the present application but not limited, as shown in Figure 2 In this embodiment 2, the first lens E1 has a negative focal power, the object side S1 is a concave surface, and the image side S2 is a concave surface. The second lens E2 has a positive focal power, the object side S3 is a convex surface, and the image side S4 is a convex surface. The third lens E3 has a negative focal power, the object side S5 is a concave surface, and the image side S6 is a concave surface. The fourth lens E4 has a negative focal power, the object side S7 is a concave surface, and the image side S8 is a concave surface. The fifth lens E5 has a positive focal power, the object side S9 is a convex surface, and the image side S10 is a convex surface. The sixth lens E6 has a negative focal power, the object side S11 is a convex surface, and the image side S12 is a concave surface. The filter E7 has an object side S13 and an image side S14. The light from the object sequentially passes through each surface S1 to S14 and is finally imaged on the imaging surface S15, and the surface type, curvature radius, thickness and material of each lens are shown in Table 3.

[0094] Table 3: Basic parameters of the optical system of Example 2

[0095] Figures 3-4 Surface No. Surface Type Curvature Radius (mm) Thickness (mm) Material OBJ Spherical 300 S1 Infinite -6.9934 0.4000 1.64,56.07 S2 Q-Asphere 1.6138 0.8359 Q-Asphere STO Spherical 0.0014 S3 Infinite 3.1750 0.6894 1.54,55.77 S4 Q-Asphere -0.9804 0.0300 S5 Q-Asphere -27.2908 0.3479 1.66,20.38 S6 Q-Asphere 9.8890 0.0538 S7 Q-Asphere -3.8597 0.4000 1.54,55.77 S8 Q-Asphere 2.0721 0.0300 S9 Q-Asphere 1.3000 0.8185 1.54,55.77 S10 Q-Asphere -0.8449 0.0500 S11 Q-Asphere 4.5186 0.3500 1.66,20.38 S12 Q-Asphere 0.9197 0.2614 S13 Q-Asphere Q-Asphere 0.2100 1.52,64.17 S14 Spherical Infinite 0.5855 S15 Spherical Infinite

[0096] In Table 3, the object side and image side of any one of the first lens E1 to the sixth lens E6 are Q type aspheric surfaces, and the surface type of each aspheric lens can be defined by the following aspheric surface formula, but not limited to:

[0097]

[0098] Wherein, Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the surface vertex, r is the radial coordinate of the aspheric surface, c is the curvature of the aspheric surface vertex, K is the conic coefficient, Am is the aspheric coefficient, rmax is the maximum radial coordinate, and u = r / rmax. Table 4 shows the conic coefficients and high order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28 and A30 of each aspheric surface that can be used in Example 2.

[0099] ​Table 4: Aspherical correlation values ​​of the lens surface in Example 2

[0100] Spherical S1 S2 S3 S4 S5 S6 K 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 A4 5.41E-01 2.98E-01 -9.17E-03 -9.17E-03 -1.58E-01 -1.01E-01 A6 -1.90E-01 -1.76E-02 -1.07E-03 -1.07E-03 1.49E-02 -4.07E-04 A8 2.60E-02 -2.18E-04 4.81E-05 4.81E-05 -2.19E-03 -3.81E-03 A10 -1.68E-02 -2.12E-03 2.55E-05 2.55E-05 2.55E-03 -4.39E-04 A12 5.57E-03 9.37E-04 5.84E-05 5.84E-05 -1.46E-03 -5.46E-04 A14 -1.03E-03 3.67E-04 -1.91E-05 -1.91E-05 -3.29E-04 3.87E-05 A16 2.25E-03 -7.98E-05 -3.14E-05 -3.14E-05 -1.99E-04 3.65E-04 A18 5.37E-04 2.50E-04 -7.18E-05 -7.18E-05 -2.75E-05 8.66E-05 A20 -2.52E-05 3.50E-04 -6.38E-05 -6.38E-05 1.15E-04 1.39E-04 A22 -6.50E-04 2.81E-04 -6.40E-05 -6.40E-05 -5.73E-05 -3.74E-05 A24 -3.79E-04 3.66E-05 -3.91E-05 -3.91E-05 1.78E-05 2.53E-05 A26 7.16E-05 -4.15E-05 -2.67E-05 -2.67E-05 -3.33E-05 1.53E-04 A28 2.71E-04 -6.48E-05 -9.07E-06 -9.07E-06 7.98E-06 8.56E-06 A30 1.83E-04 -1.22E-05 -7.50E-06 -7.50E-06 1.39E-07 3.66E-05 Infinite S7 S8 S9 S10 S11 S12 K -3.30E+01 7.08E-01 -1.14E+01 -3.61E+00 -3.17E+01 -1.68E+00 A4 3.69E-02 -3.55E-01 -2.03E-01 -8.09E-02 -9.20E-01 -1.48E+00 A6 -1.01E-02 2.29E-03 -4.62E-02 -1.66E-02 6.91E-01 1.33E+00 A8 1.59E-03 1.35E-02 2.18E-02 2.07E-02 -1.32E-01 2.40E-01 A10 -1.23E-03 -3.74E-03 1.29E-03 8.97E-03 -4.99E-02 6.81E-02 A12 4.95E-04 2.87E-03 3.56E-03 -6.65E-03 3.55E-02 -7.96E-02 A14 -3.26E-04 -3.83E-05 -5.04E-04 -3.16E-03 3.47E-03 1.34E-02 A16 6.66E-04 8.46E-04 2.02E-04 -6.29E-04 -1.01E-02 5.21E-02 A18 1.71E-04 -6.15E-04 -1.28E-03 -6.00E-04 -4.55E-04 3.06E-02 A20 2.05E-04 6.11E-05 1.40E-05 9.44E-04 4.59E-03 5.65E-03 A22 -1.29E-04 -2.49E-05 8.11E-05 1.79E-04 -1.54E-03 -3.37E-03 A24 -3.84E-05 6.50E-05 1.67E-04 -1.16E-05 -1.82E-03 1.99E-04 A26 1.44E-04 -4.42E-05 -7.14E-05 -2.72E-04 1.44E-03 2.73E-03 A28 -4.72E-05 7.69E-06 -2.05E-05 -9.18E-05 6.22E-04 1.76E-03 A30 1.94E-05 6.96E-07 -1.38E-05 -6.36E-05 -1.02E-03 2.18E-04

[0101] Surface No. The on-axis chromatic aberration, astigmatism, and distortion curves of the optical system of Embodiment 2 are shown. On-axis chromatic aberration represents the deviation of the focal point of light of different wavelengths after passing through the lens; astigmatism represents the meridional and sagittal image plane curvature; and distortion represents the magnitude of distortion corresponding to different image heights. From Surface No. It can be seen that the optical system given in Example 2 can achieve good imaging quality.

[0102] Specifically, this is a preferred embodiment of the invention and not a limitation thereof, such as Figure 4 As shown, in this embodiment 3, the first lens E1 has negative optical power, with its object-side surface S1 being concave and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being convex. The third lens E3 has negative optical power, with its object-side surface S5 being concave and its image-side surface S6 being convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being convex. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The filter E7 has an object-side surface S13 and an image-side surface S14. Light from the object passes through surfaces S1 to S14 in sequence and is finally imaged on the imaging surface S15. The surface type, radius of curvature, thickness and material of each lens are shown in Table 5.

[0103] Table 5: Basic parameters of the optical system in Example 3

[0104] Figure 4 Figures 5-6 Surface No. Surface Type Curvature Radius (mm) Thickness (mm) Material OBJ 300 S1 Spherical -6.8493 0.4037 1.57,63.46 S2 Infinite 1.4138 0.9915 Q-Asphere Q-Asphere STO -0.0155 S3 Spherical 2.1249 0.7218 1.54,55.77 S4 Infinite -0.9179 0.0300 S5 Q-Asphere -3.3535 0.3000 1.66,20.38 S6 Q-Asphere -500.0000 0.0421 S7 Q-Asphere -4.7118 0.5958 1.54,55.77 S8 Q-Asphere -5.2579 0.0302 S9 Q-Asphere 85.9958 0.4679 1.54,55.77 S10 Q-Asphere -15.1415 0.0777 S11 Q-Asphere 0.7362 0.3500 1.66,20.38 S12 Q-Asphere 0.7061 0.2855 S13 Q-Asphere Q-Asphere 0.2100 1.52,64.17 S14 Q-Asphere Spherical 0.6080 S15 Infinite Spherical

[0105] In Table 5, the object-side surface and image-side surface of any one of the lenses from the first lens E1 to the sixth lens E6 are Q-type aspherical surfaces. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0106]

[0107] Where Z is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, r is the radial coordinate of the aspherical surface, c is the curvature of the vertex of the aspherical surface, K is the conic coefficient, Am is the aspherical coefficient, rmax is the maximum value of the radial radius coordinate, and u = r / rmax. Table 6 gives the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28 and A30 that can be used for each aspherical surface in Example 3.

[0108] Table 6: Aspherical Correlation Values ​​of Lens Surface in Example 3

[0109] Infinite S1 S2 S3 S4 S5 S6 K 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 A4 6.26E-01 3.61E-01 -7.68E-03 -5.85E-02 -1.78E-01 -7.82E-02 A6 -1.80E-01 -3.72E-03 -7.27E-04 -1.44E-03 1.71E-02 3.32E-03 A8 3.12E-02 -6.83E-03 -1.53E-04 -3.63E-03 7.19E-04 -2.56E-03 A10 -1.35E-02 -5.08E-03 3.85E-05 1.42E-03 1.43E-03 -3.05E-03 A12 3.88E-03 -1.77E-04 1.24E-06 -3.79E-04 -1.93E-03 1.06E-03 A14 -2.63E-03 1.72E-03 2.88E-05 -9.64E-05 -1.79E-04 -7.88E-04 A16 9.72E-04 9.42E-04 4.58E-06 -3.56E-04 1.29E-04 6.68E-04 A18 5.23E-05 5.74E-04 1.51E-05 -1.26E-04 8.53E-05 2.10E-04 A20 7.08E-04 -1.74E-04 1.93E-06 -4.25E-05 -2.03E-04 1.93E-04 A22 6.15E-04 -9.01E-05 7.80E-06 8.84E-05 -8.24E-05 -1.99E-04 A24 6.43E-04 -1.01E-04 1.32E-06 1.43E-04 6.87E-05 4.62E-05 A26 4.13E-04 1.32E-04 4.40E-06 1.31E-04 8.42E-05 -3.62E-05 A28 1.81E-04 9.99E-05 -7.74E-07 7.75E-05 5.62E-05 5.21E-05 A30 3.49E-05 1.04E-04 2.50E-06 3.01E-05 9.74E-06 -4.14E-06 Spherical S7 S8 S9 S10 S11 S12 K -1.23E+01 -9.69E+01 9.90E+01 8.65E+01 8.65E+01 -1.91E+00 A4 2.44E-02 -3.04E-01 -2.06E-01 -2.77E-01 -2.77E-01 -1.56E+00 A6 -4.03E-03 1.44E-02 -4.33E-02 2.60E-02 2.60E-02 1.37E+00 A8 2.06E-03 1.47E-02 1.85E-02 -2.62E-02 -2.62E-02 2.30E-01 A10 -3.87E-03 -4.65E-03 -1.56E-04 3.83E-02 3.83E-02 7.54E-02 A12 2.27E-03 3.57E-03 3.45E-03 -1.74E-02 -1.74E-02 -8.68E-02 A14 -1.05E-03 -1.12E-03 -1.75E-03 7.09E-03 7.09E-03 1.33E-02 A16 9.44E-04 5.39E-04 2.61E-05 -4.90E-03 -4.90E-03 4.76E-02 A18 7.22E-05 -3.79E-04 -1.07E-03 3.50E-04 3.50E-04 3.59E-02 A20 1.88E-04 1.96E-04 1.10E-04 -9.72E-04 -9.72E-04 2.15E-03 A22 -2.06E-04 1.18E-04 -1.82E-04 4.67E-04 4.67E-04 -4.26E-03 A24 1.83E-04 -1.53E-04 -3.31E-04 -6.02E-04 -6.02E-04 2.64E-03 A26 4.62E-05 1.48E-04 1.05E-04 4.30E-04 4.30E-04 2.49E-03 A28 1.24E-04 -7.84E-05 -1.49E-04 -2.24E-04 -2.24E-04 4.41E-04 A30 1.97E-05 3.47E-05 7.08E-05 1.39E-04 1.39E-04 -1.11E-03

[0110] Infinite The on-axis chromatic aberration, astigmatism, and distortion curves of the optical system of Example 3 are shown. On-axis chromatic aberration represents the deviation of the focal point of light of different wavelengths after passing through the lens; astigmatism represents the meridional and sagittal image plane curvature; and distortion represents the magnitude of distortion at different image heights. From Surface No. It can be seen that the optical system given in Example 3 can achieve good imaging quality.

[0111] Specifically, this is a preferred embodiment of the invention and not a limitation thereof, such as Surface No. As shown, in this embodiment 4, the first lens E1 has negative optical power, with its object-side surface S1 being concave and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being convex. The third lens E3 has negative optical power, with its object-side surface S5 being concave and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The filter E7 has an object-side surface S13 and an image-side surface S14. Light from the object passes through surfaces S1 to S14 in sequence and is finally imaged on the imaging surface S15. The surface type, radius of curvature, thickness and material of each lens are shown in Table 7.

[0112] Table 7: Basic parameters of the optical system in Example 4

[0113] Figure 6 Figure 6 Figures 7-8 Surface No. Surface Type Curvature Radius (mm) Thickness (mm) Material 300 S1 OBJ -4.9206 0.4187 1.58,62.74 S2 Spherical 1.4286 1.0176 Infinite Q-Asphere Q-Asphere -0.0317 S3 STO 1.7232 0.6999 1.54,55.77 S4 Spherical -1.0838 0.0657 S5 Infinite -9.9111 0.3000 1.66,20.38 S6 Q-Asphere 3.3108 0.0481 S7 Q-Asphere 14.2679 0.6595 1.54,55.77 S8 Q-Asphere -2.8901 0.0300 S9 Q-Asphere -20.6623 0.4000 1.54,55.77 S10 Q-Asphere -100.0000 0.0880 S11 Q-Asphere 0.8476 0.3500 1.66,20.38 S12 Q-Asphere 0.7299 0.2608 S13 Q-Asphere Q-Asphere 0.2100 1.52,64.17 S14 Q-Asphere Q-Asphere 0.5834 S15 Spherical Infinite

[0114] In Table 7, the object-side surface and image-side surface of any one of the lenses from the first lens E1 to the sixth lens E6 are Q-type aspherical surfaces. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0115]

[0116] Where Z is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, r is the radial coordinate of the aspherical surface, c is the curvature of the vertex of the aspherical surface, K is the conic coefficient, Am is the aspherical coefficient, rmax is the maximum value of the radial radius coordinate, and u = r / rmax. Table 8 gives the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28 and A30 that can be used for each aspherical surface in Example 4.

[0117] Table 8: Aspherical Correlation Values ​​of Lens Surface in Example 4

[0118] Spherical S1 S2 S3 S4 S5 S6 K 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 A4 6.62E-01 3.99E-01 -6.22E-03 -7.00E-02 -1.76E-01 -7.97E-02 A6 -1.75E-01 -1.40E-02 -6.27E-04 -1.06E-02 5.44E-03 9.16E-03 A8 2.93E-02 -1.50E-02 -1.55E-04 -1.60E-03 5.50E-03 1.15E-03 A10 -9.86E-03 -5.96E-03 1.79E-05 1.85E-04 2.28E-04 -4.38E-03 A12 4.24E-03 1.28E-03 -2.27E-05 5.43E-04 -1.05E-03 6.29E-04 A14 -1.65E-03 2.30E-03 1.14E-05 2.50E-04 -7.62E-04 -9.83E-04 A16 7.99E-04 1.12E-03 -9.18E-06 7.63E-05 4.66E-05 5.95E-04 A18 1.39E-04 4.60E-04 5.03E-06 -1.36E-04 8.77E-05 4.55E-05 A20 5.80E-04 -4.36E-05 -4.16E-06 -1.69E-04 5.43E-05 3.69E-04 A22 4.87E-04 -1.16E-04 3.41E-06 -1.78E-04 -8.95E-05 7.48E-05 A24 5.12E-04 -2.03E-04 -1.03E-06 -1.23E-04 -3.77E-05 6.07E-05 A26 3.99E-04 -8.86E-05 2.45E-06 -7.24E-05 -4.73E-06 -3.13E-06 A28 2.14E-04 -3.34E-05 -2.52E-06 -2.83E-05 1.34E-05 2.87E-05 A30 7.14E-05 2.79E-05 6.63E-07 -6.67E-06 6.92E-07 7.84E-06 Infinite S7 S8 S9 S10 S11 S12 K -9.90E+01 -9.90E+01 9.90E+01 9.90E+01 -1.96E+01 -2.09E+00 A4 7.36E-03 -2.70E-01 -2.08E-01 -3.69E-01 -8.77E-01 -1.52E+00 A6 -2.82E-04 1.73E-02 -3.76E-02 3.98E-02 6.12E-01 1.42E+00 A8 3.10E-03 1.49E-02 1.87E-02 -4.11E-02 -6.80E-02 2.14E-01 A10 -5.60E-03 -4.55E-03 3.84E-04 4.03E-02 -4.22E-02 8.73E-02 A12 2.28E-03 3.91E-03 3.64E-03 -1.88E-02 1.05E-02 -9.70E-02 A14 -6.80E-04 -1.02E-03 -2.09E-03 9.76E-03 1.94E-02 2.61E-02 A16 1.26E-03 1.25E-04 -2.97E-04 -4.66E-03 -1.58E-02 3.73E-02 A18 9.57E-05 -3.81E-04 -7.26E-04 1.22E-03 1.91E-03 3.90E-02 A20 2.34E-04 1.40E-04 4.47E-04 -2.70E-04 1.28E-03 9.21E-04 A22 -1.80E-04 2.35E-06 -7.40E-05 3.06E-04 1.60E-03 -1.41E-03 A24 -1.54E-04 -9.58E-05 -1.59E-04 -3.21E-04 -2.28E-03 -1.12E-03 A26 -1.41E-04 8.44E-05 6.17E-05 3.39E-04 -4.79E-04 3.59E-03 A28 -1.89E-05 -2.70E-05 -1.36E-04 -2.51E-04 2.54E-03 1.75E-03 A30 -2.09E-06 1.81E-06 -2.07E-05 1.23E-04 6.60E-04 5.36E-04

[0119] Spherical The on-axis chromatic aberration, astigmatism, and distortion curves of the optical system of Example 4 are shown. On-axis chromatic aberration represents the deviation of the focal point of light of different wavelengths after passing through the lens; astigmatism represents the meridional and sagittal image plane curvature; and distortion represents the magnitude of distortion at different image heights. From Infinite It can be seen that the optical system given in Example 4 can achieve good imaging quality.

[0120] Specifically, this is a preferred embodiment of the invention and not a limitation thereof, such as Surface No. As shown, in this embodiment 5, the first lens E1 has negative optical power, with its object-side surface S1 being concave and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being convex. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being concave. The sixth lens E6 has negative optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The filter E7 has an object-side surface S13 and an image-side surface S14. Light from the object passes through surfaces S1 to S14 in sequence and is finally imaged on the imaging surface S15. The surface type, radius of curvature, thickness and material of each lens are shown in Table 9.

[0121] Table 9: Basic Parameters of the Optical System in Example 5

[0122] Surface No. Figure 8 Figure 8 Figures 9-10 Surface No. Surface Type Curvature Radius (mm) Thickness (mm) 300 S1 Material -3.5483 0.4608 1.60,61.40 S2 OBJ 1.7929 0.9206 Spherical Infinite Q-Asphere -0.0291 S3 Q-Asphere 1.9449 0.6848 1.54,55.77 S4 STO -1.8916 0.0697 S5 Spherical 3.3679 0.3000 1.66,20.38 S6 Infinite 3.4199 0.0424 S7 Q-Asphere 19.7424 0.7181 1.54,55.77 S8 Q-Asphere -2.7484 0.0300 S9 Q-Asphere 59.7820 0.4470 1.54,55.77 S10 Q-Asphere 100.0000 0.0723 S11 Q-Asphere 0.9187 0.3500 1.66,20.38 S12 Q-Asphere 0.7194 0.2502 S13 Q-Asphere Q-Asphere 0.2100 1.52,64.17 S14 Q-Asphere Q-Asphere 0.5732 S15 Q-Asphere Spherical

[0123] In Table 9, the object-side surface and image-side surface of any one of the lenses from the first lens E1 to the sixth lens E6 are Q-type aspherical surfaces. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0124]

[0125] Where Z is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, r is the radial coordinate of the aspherical surface, c is the curvature of the vertex of the aspherical surface, K is the conic coefficient, Am is the aspherical coefficient, rmax is the maximum value of the radial radius coordinate, and u = r / rmax. Table 10 gives the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28 and A30 that can be used for each aspherical surface in Example 5.

[0126] Table 10: Aspherical Correlation Values ​​of Lens Surface in Example 5

[0127] Infinite S1 S2 S3 S4 S5 S6 K -8.46E-02 8.51E-02 -1.06E-01 9.11E-01 -2.00E+01 1.84E+00 A4 7.84E-01 4.49E-01 -4.48E-03 -1.33E-01 -2.25E-01 -5.70E-02 A6 -1.80E-01 -1.40E-02 -4.53E-04 -6.53E-04 8.18E-03 -6.76E-03 A8 2.98E-02 -2.01E-02 -1.26E-04 -3.51E-03 2.47E-03 9.44E-03 A10 -8.14E-03 -7.85E-03 2.49E-05 5.13E-05 2.23E-03 -5.40E-03 A12 6.46E-03 1.86E-03 -2.02E-05 1.23E-04 1.12E-04 2.03E-03 A14 7.72E-05 3.00E-03 1.30E-05 1.24E-04 -8.39E-04 -1.10E-03 A16 1.85E-03 1.28E-03 -8.37E-06 1.82E-04 -4.48E-04 9.84E-04 A18 8.33E-04 3.19E-04 3.82E-06 8.65E-05 -3.08E-04 -3.02E-04 A20 9.73E-04 -3.19E-05 -6.90E-06 7.17E-05 4.08E-05 5.72E-05 A22 6.45E-04 7.01E-05 3.14E-06 2.73E-05 9.42E-05 -1.18E-04 A24 5.13E-04 8.33E-05 -4.33E-07 8.03E-06 1.14E-04 -2.39E-05 A26 3.12E-04 1.38E-04 2.88E-06 -2.61E-06 6.48E-05 -6.91E-05 A28 1.35E-04 9.07E-05 -2.29E-06 -4.61E-06 2.89E-05 -2.15E-05 A30 3.07E-05 5.49E-05 4.69E-07 -9.81E-07 4.72E-06 -1.52E-05 Spherical S7 S8 S9 S10 S11 S12 K 9.90E+01 -9.71E+01 2.49E+01 -9.90E+01 -2.22E+01 -2.15E+00 A4 5.42E-02 -2.56E-01 -2.50E-01 -5.05E-01 -8.62E-01 -1.27E+00 A6 -2.14E-02 6.54E-03 -2.80E-02 1.03E-01 6.81E-01 1.45E+00 A8 1.28E-02 1.37E-02 1.83E-02 -5.76E-02 -1.54E-01 1.60E-01 A10 -8.06E-03 -4.78E-03 -2.14E-03 4.66E-02 4.03E-03 1.09E-01 A12 2.16E-03 3.57E-03 4.63E-03 -1.87E-02 -7.62E-03 -9.78E-02 A14 -1.61E-03 -6.92E-04 -1.65E-03 1.26E-02 2.15E-02 2.84E-02 A16 1.27E-03 1.33E-04 -1.21E-04 -5.40E-03 -1.91E-02 2.94E-02 A18 -2.41E-04 -4.39E-04 -8.06E-04 1.83E-03 7.59E-03 4.40E-02 A20 1.62E-04 1.64E-04 6.28E-04 2.45E-05 -2.40E-03 8.54E-04 A22 -1.41E-05 6.74E-06 -2.76E-05 4.07E-04 3.02E-03 -1.90E-03 A24 6.44E-05 -9.84E-05 -7.75E-05 -1.98E-04 -4.31E-03 -4.22E-03 A26 -3.14E-05 9.36E-05 1.53E-04 4.71E-04 1.66E-03 6.34E-03 A28 -2.14E-06 -3.27E-05 -8.04E-05 -2.01E-04 3.75E-03 4.75E-03 A30 -1.14E-05 4.09E-06 8.56E-06 1.24E-04 3.28E-04 2.59E-03

[0128] Infinite The on-axis chromatic aberration, astigmatism, and distortion curves of the optical system of Example 5 are shown. On-axis chromatic aberration represents the deviation of the focal point of light of different wavelengths after passing through the lens; astigmatism represents the meridional and sagittal image plane curvature; and distortion represents the magnitude of distortion corresponding to different image heights. From Spherical It can be seen that the optical system given in Example 5 can achieve good imaging quality.

[0129] In Examples 1-5, the basic data is as follows:

[0130] Table 11: Basic Data for Examples 1-5

[0131] Infinite Surface No. Surface No. Figure 10 Figure 10 Base Data Example 1 -1.94 -1.99 -2.02 -1.86 -1.91 Example 2 2.05 1.48 1.30 1.36 1.90 Example 3 -3.34 -10.81 -5.05 -3.68 100.00 Example 4 3.29 -2.45 -136.45 4.53 4.54 Example 5 2.42 1.10 24.00 -48.56 275.57 f1 (mm) -5.18 -1.80 7.06 41.09 -16.75 f2 (mm) 1.23 1.30 1.30 1.35 1.39 f3 (mm) 5.10 5.06 5.10 5.10 5.10 f4 (mm) 168.76 169.55 169.74 169.92 170.00 f5 (mm) f6 (mm) f (mm) TTL (mm) FOV (°) f / EPD 2.40 2.40 2.40 2.40 2.40

[0132] In Examples 1-5, each conditional expression satisfies the conditions in the table below:

[0133] Table 12: Conditional Expressions for Examples 1-5

[0134]

[0135]

[0136] A camera module includes at least an optical lens, within which is installed the aforementioned ultra-wide-angle, small-aperture, ultra-thin optical system. Through reasonable allocation of optical power and optimized selection of high-order aspherical parameters, it can achieve miniaturization while also maintaining small head and ultra-wide-angle shooting functions. It has the advantages of ultra-wide-angle, miniaturization, and ultra-thinness, with a compact structure that is easy to process and install, and at the same time, it has good imaging resolution.

[0137] The above description provides one or more embodiments in conjunction with specific content, and does not imply that the specific implementation of the present invention is limited to these descriptions. Any methods or structures that are similar to or identical to those of the present invention, or any technical deductions or substitutions made based on the concept of the present invention, should be considered within the scope of protection of the present invention.

Claims

1. An ultra-wide-angle, small-aperture, ultra-thin optical system, characterized in that: Along the optical axis from the object plane to the image plane, the lenses consist of a first lens, an aperture stop, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The object side of the first lens is concave, and its optical power is negative. The object plane side of the second lens is convex, the image plane side is convex, and its optical power is positive. The third lens has optical power; The fourth lens has optical power; The fifth lens has optical power; The object side of the sixth lens is convex, and the image side is concave, and it has optical power. The optical system satisfies the following conditions: 87 < FOV / (TTL / IamgH / DT11) < 100; 0.7 < f12 / f23 < 1.7; 2.3 < ΣCT / ΣAT < 3.0; Wherein, FOV is the maximum field of view of the optical system, TTL is the on-axis distance from the object side of the first lens to the imaging plane, ImgH is half the diagonal length of the effective pixel area on the imaging plane, DT11 is the maximum effective radius of the object side of the first lens, f12 is the effective combined focal length of the first and second lenses, f23 is the effective combined focal length of the second and third lenses, ΣCT is the sum of the center thicknesses of the first, second, third, fourth, fifth, and sixth lenses on the optical axis, and ΣAT is the sum of the air gaps on the optical axis between adjacent lenses among the first, second, third, fourth, fifth, and sixth lenses.

2. The ultra-wide-angle, small-aperture, ultra-thin optical system according to claim 1, characterized in that, The optical system satisfies the following conditions: 0.7 < (f5-f6) / f5 < 3.2; Where f5 is the effective focal length of the fifth lens and f6 is the effective focal length of the sixth lens.

3. The ultra-wide-angle, small-aperture, ultra-thin optical system according to claim 1, characterized in that, The optical system satisfies the following conditions: 1.2 < |R8| / R2 < 3.8; Where R2 is the radius of curvature of the image-side surface of the first lens, and R8 is the radius of curvature of the image-side surface of the fourth lens; and / or -3.3 < R3 / R4 < -1.0; Wherein, R3 is the radius of curvature of the object side of the second lens, and R4 is the radius of curvature of the image side of the second lens.

4. The ultra-wide-angle, small-aperture, ultra-thin optical system according to claim 1, characterized in that, The optical system satisfies the following conditions: 0 < R12 / R11+|SAG12 / SAG11| < 1.2; Wherein, R11 is the radius of curvature of the object side of the sixth lens, R12 is the radius of curvature of the image side of the sixth lens, SAG11 is the distance from the point where the object side of the sixth lens has the maximum effective aperture to the point where the object side of the sixth lens intersects the optical axis, parallel to the optical axis, and SAG12 is the distance from the point where the image side of the sixth lens has the maximum effective aperture to the point where the image side of the sixth lens intersects the optical axis, parallel to the optical axis; and / or -4.1 < DT52 / SAG10 < -2.1; Wherein, DT52 is the maximum effective radius of the image side of the fifth lens, and SAG10 is the distance from the maximum effective aperture of the image side of the fifth lens to the intersection of the image side of the fifth lens and the optical axis in the direction parallel to the optical axis.

5. The ultra-wide-angle, small-aperture, ultra-thin optical system according to claim 1, characterized in that, The optical system satisfies the following conditions: 0.7 < (CT5+CT6) / T12 < 1.4; Wherein, CT5 is the center thickness of the fifth lens on the optical axis, CT6 is the center thickness of the sixth lens on the optical axis, and T12 is the air gap between the first and second lenses on the optical axis.

6. The ultra-wide-angle, small-aperture, ultra-thin optical system according to claim 1, characterized in that, The optical system satisfies the following conditions: 0 < f / R11 < 1.8; Where f is the effective focal length of the optical imaging system, and R11 is the radius of curvature of the object side of the sixth lens.

7. The ultra-wide-angle, small-aperture, ultra-thin optical system according to claim 1, characterized in that, The optical system satisfies the following condition: 1.4 < (DT62-DT61) / |DT12-DT11| < 2.4; Wherein, DT11 is the maximum effective radius of the object-side surface of the first lens, DT12 is the maximum effective radius of the image-side surface of the first lens, DT61 is the maximum effective radius of the object-side surface of the sixth lens, and DT62 is the maximum effective radius of the image-side surface of the sixth lens; and / or 12 < f*tan(HFOV) / T12 < 18; Where f is the effective focal length of the optical system, HFOV is half of the maximum field of view of the optical system, and T12 is the air gap between the first lens and the second lens on the optical axis.

8. The ultra-wide-angle, small-aperture, ultra-thin optical system according to any one of claims 1-7, characterized in that, The first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are all aspherical lenses.

9. The ultra-wide-angle, small-aperture, ultra-thin optical system according to any one of claims 1-7, characterized in that, The maximum effective radius DT11 of the object side of the first lens satisfies: DT11 < 1.6 mm; The F-number of the optical system is 2.4; The optical system's full field of view (FOV) satisfies: FOV > 168°; The total optical length (TTL) of the optical system satisfies: TTL≤5.1 mm.

10. A camera module, comprising at least an optical lens, characterized in that, The optical lens is equipped with the ultra-wide-angle, small-aperture, ultra-thin optical system as described in any one of claims 1-9.

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