A live lens and optical system thereof

Abstract

The application discloses a live lens and an optical system thereof. The optical system comprises, in order from an object side to an image side along an optical axis, a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with positive focal power or negative focal power, a fifth lens with positive focal power, a sixth lens with positive focal power or negative focal power, a seventh lens with negative focal power or positive focal power, an eighth lens with negative focal power, and a ninth lens with positive focal power. Wherein, 2≤TTL / IC≤6, TTL is the total length of the optical system, and IC is the optical target surface of the optical system. By adopting the technical scheme, the live lens comprising the optical system can meet the requirements of small volume, large target surface and high imaging quality.

Description

Technical Field

[0001] This invention relates to the field of optical device technology, and in particular to a live streaming lens and its optical system. Background Technology

[0002] With the advancement of technology, optical lenses have developed rapidly, and their applications have become increasingly diversified, such as in video conferencing, live streaming, medical, home, and security fields. Among these, live streaming lenses used in video conferencing and live streaming, due to their real-time nature, place increasingly higher performance requirements on their optical systems.

[0003] Therefore, how to further improve the performance of the optical system of live streaming lenses has become an urgent technical problem to be solved. Summary of the Invention

[0004] This invention provides a live streaming lens and its optical system, which addresses the technical problem that the optical systems of existing live streaming lenses cannot meet the high-performance requirements of live streaming.

[0005] According to one aspect of the present invention, an optical system is provided, comprising a first lens with negative optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with positive or negative optical power, a fifth lens with positive optical power, a sixth lens with positive or negative optical power, a seventh lens with negative or positive optical power, an eighth lens with negative optical power, and a ninth lens with positive optical power, arranged sequentially along the optical axis from the object side to the image side.

[0006] Where 2≤TTL / IC≤6, TTL is the total length of the optical system, and IC is the optical target surface of the optical system.

[0007] Optionally, -0.10 ≤ (DISG*100) / TANS12 ≤ -0.07;

[0008] Wherein, DISG is the optical distortion of the optical system, and TANS12 is the tangential angle of the first lens near the image surface.

[0009] Optionally, 1.78 ≤ f / ENPD ≤ 2.02;

[0010] Where f is the focal length of the optical system and ENPD is the entrance pupil diameter of the optical system.

[0011] Optionally, -0.191 ≤ φ1 / φ ≤ -0.132;

[0012] -0.256≤φ2 / φ≤-0.080;

[0013] 0.117≤φ3 / φ≤0.216;

[0014] -0.378≤φ4 / φ≤0.117

[0015] Wherein, φ1 is the optical power of the first lens, φ2 is the optical power of the second lens, φ3 is the optical power of the third lens, φ4 is the optical power of the fourth lens, and φ is the optical power of the optical system.

[0016] Optionally, 0.639≤φ5 / (φ6+φ7)≤2.548;

[0017] -1.856≤φ8 / (φ6+φ7)≤-0.166;

[0018] 0.004≤φ9 / (φ6+φ7)≤0.679;

[0019] Wherein, φ5 is the optical power of the fifth lens, φ6 is the optical power of the sixth lens, φ7 is the optical power of the seventh lens, φ8 is the optical power of the eighth lens, and φ9 is the optical power of the ninth lens.

[0020] Optional, 1.71≤n1≤1.89; 43.20≤v1≤64.80;

[0021] 1.64≤n²≤1.67; 48.91≤v²≤61.99;

[0022] 1.83≤n3≤1.89; 39.70≤v3≤55.30;

[0023] 1.55≤n4≤1.57; 55.42≤v4≤58.78;

[0024] 1.59≤n5≤1.92; 40.42≤v5≤71.38;

[0025] 1.58≤n6≤1.81; 26.50≤v6≤68.50;

[0026] 1.57≤n7≤1.85; 37.13≤v7≤75.17;

[0027] 1.55≤n8≤1.71; 14.93≤v8≤42.07;

[0028] 1.60≤n9≤1.72; 43.85≤v9≤57.65;

[0029] Wherein, n1 is the refractive index of the first lens, v1 is the Abbe number of the first lens; n2 is the refractive index of the second lens, v2 is the Abbe number of the second lens; n3 is the refractive index of the third lens, v3 is the Abbe number of the third lens; n4 is the refractive index of the fourth lens, v4 is the Abbe number of the fourth lens; n5 is the refractive index of the fifth lens, v5 is the Abbe number of the fifth lens; n6 is the refractive index of the sixth lens, v6 is the Abbe number of the sixth lens; n7 is the refractive index of the seventh lens, v7 is the Abbe number of the seventh lens; n8 is the refractive index of the eighth lens, v8 is the Abbe number of the eighth lens; n9 is the refractive index of the ninth lens, v9 is the Abbe number of the ninth lens.

[0030] Optionally, the sixth lens and the seventh lens are cemented lenses.

[0031] Optionally, the first lens, the second lens, the third lens, the fifth lens, the sixth lens, and the seventh lens are all spherical lenses;

[0032] The fourth lens, the eighth lens, and the ninth lens are all aspherical lenses.

[0033] Optionally, the horizontal field of view of the optical system is greater than or equal to 90°; the vertical field of view of the optical system is greater than or equal to 75°.

[0034] According to another aspect of the present invention, a live streaming lens is provided, comprising: the aforementioned optical system.

[0035] The technical solution of this invention, by rationally allocating the optical power of each lens in the optical system, can achieve a large light transmission, small distortion, and high imaging clarity, and can improve or eliminate imaging purple fringing, thereby matching a high-resolution imaging sensor; at the same time, by setting the total length TTL of the optical system and the optical target IC of the optical system to satisfy 2≤TTL / IC≤6, the optical system can meet the performance requirements of a large target while having a small volume.

[0036] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the structure of an optical system provided in an embodiment of the present invention;

[0039] Figure 2 To and Figure 1 Axial aberration curves for a corresponding optical system;

[0040] Figure 3 To and Figure 1 A field curvature distortion diagram of a corresponding optical system;

[0041] Figure 4 To and Figure 1 A dot diagram of a corresponding optical system;

[0042] Figure 5 This is a schematic diagram of another optical system provided in an embodiment of the present invention;

[0043] Figure 6 To and Figure 5 Axial aberration curves for a corresponding optical system;

[0044] Figure 7 To and Figure 5 A field curvature distortion diagram of a corresponding optical system;

[0045] Figure 8 To and Figure 5 A dot diagram of a corresponding optical system;

[0046] Figure 9 This is a schematic diagram of the structure of another optical system provided in an embodiment of the present invention;

[0047] Figure 10 To and Figure 9 Axial aberration curves for a corresponding optical system;

[0048] Figure 11 To and Figure 9 A field curvature distortion diagram of a corresponding optical system;

[0049] Figure 12 To and Figure 9 A dot diagram of a corresponding optical system. Detailed Implementation

[0050] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0051] It should be noted that the terms "comprising" and "having" and any variations thereof in the specification and claims of this invention are intended to cover non-exclusive inclusion. For example, a system, product, or device that includes a series of structures or units is not necessarily limited to those structures or units that are explicitly listed, but may include other structures or units that are not explicitly listed or that are inherent to such systems, products, or devices.

[0052] This invention provides an optical system that can be integrated into the lens barrel of a live streaming lens, achieving a small volume and large target surface while meeting the requirements of large light transmission, small distortion, and high imaging clarity.

[0053] Figure 1 This is a schematic diagram of the structure of an optical system provided in an embodiment of the present invention, such as... Figure 1 As shown, the optical system provided in this embodiment of the invention includes a first lens 10 with negative optical power, a second lens 20 with negative optical power, a third lens 30 with positive optical power, a fourth lens 40 with positive or negative optical power, a fifth lens 50 with positive optical power, a sixth lens 60 with positive or negative optical power, a seventh lens 70 with negative or positive optical power, an eighth lens 80 with negative optical power, and a ninth lens 90 with positive optical power, arranged sequentially along the optical axis from the object side to the image side; wherein, 2≤TTL / IC≤6, TTL is the total length of the optical system, and IC is the optical target surface of the optical system.

[0054] Specifically, optical power is equal to the difference between the convergence of the image-side beam and the convergence of the object-side beam; it characterizes the ability of an optical system to deflect light rays. The larger the absolute value of the optical power, the stronger the bending ability of light rays; the smaller the absolute value, the weaker the bending ability. When the optical power is positive, the refraction of light rays is converging; when the optical power is negative, the refraction of light rays is diverging. Optical power can be used to characterize a single refractive surface of a lens (i.e., one surface of the lens), a single lens, or a system formed by multiple lenses (i.e., a lens group). In this embodiment of the invention, by setting the first lens 10 closest to the object side to have a negative optical power, the incident angle of light in the optical system can be controlled and field curvature corrected; by setting the second lens 20 adjacent to the first lens 10 to have a negative optical power, off-axis aberrations can be corrected; at the same time, by combining the first lens 10 and the second lens 20 with a negative optical power with a third lens 30 with a positive optical power, a fourth lens 40 with a positive or negative optical power, a fifth lens 50 with a positive optical power, a sixth lens 60 with a positive or negative optical power, a seventh lens 70 with a negative or positive optical power, an eighth lens 80 with a negative optical power, and a ninth lens 90 with a positive optical power, vertical aberrations and axial aberrations can be corrected, resulting in a wide-angle, low-distortion image that does not exhibit obvious distortion, no obvious purple fringing in real-world shooting, and ultra-high-definition imaging effects. It can be matched with an optical imaging sensor with a resolution of 8000*6000 and a pixel size of 0.8um, and the aperture can reach F1.8, ensuring a large light throughput.

[0055] Furthermore, the total length of the optical system determines the size of the live streaming lens that integrates the optical system. By setting the total length TTL of the optical system and the optical target surface IC of the optical system to satisfy 2≤TTL / IC≤6, a larger target surface can be achieved while ensuring that the live streaming lens including the optical system has a small size.

[0056] The embodiments of the present invention, by rationally allocating the optical power of each lens in the optical system, can achieve a large light transmission, small distortion, and high imaging clarity, and can improve or eliminate imaging purple fringing, thereby matching high-resolution imaging sensors; at the same time, by setting the total length TTL of the optical system and the optical target IC of the optical system to satisfy 2≤TTL / IC≤6, the optical system can meet the performance requirements of a large target while having a small volume.

[0057] Optionally, -0.10≤(DISG*100) / TANS12≤-0.07; where DISG is the optical distortion of the optical system and TANS12 is the tangential angle of the first lens near the image surface.

[0058] Thus, by setting the optical distortion DISG of the optical system and the tangential angle of the first lens near the image surface to satisfy -0.10≤(DISG*100) / TANS12≤-0.07, the optical distortion of the lens can be effectively reduced, ensuring that the image is free from obvious distortion.

[0059] Optionally, 1.78≤f / ENPD≤2.02; where f is the focal length of the optical system and ENPD is the entrance pupil diameter of the optical system.

[0060] Thus, by setting the focal length f of the optical system and the entrance pupil diameter ENPD of the optical system to satisfy 1.78≤f / ENPD≤2.02, the requirement for a large aperture can be met, enabling the aperture to reach F1.8, thereby achieving a large light throughput and meeting the requirements for brightness and sharpness of the image.

[0061] Optionally, the optical power φ1 of the first lens 10, the optical power φ2 of the second lens 20, the optical power φ3 of the third lens 30, the optical power φ4 of the fourth lens 40, and the optical power φ of the optical system satisfy the following:

[0062] -0.191≤φ1 / φ≤-0.132;

[0063] -0.256≤φ2 / φ≤-0.080;

[0064] 0.117≤φ3 / φ≤0.216;

[0065] -0.378≤φ4 / φ≤0.117.

[0066] By limiting the ratios of the optical power φ1 of the first lens 10, the optical power φ2 of the second lens 20, the optical power φ2 of the third lens 30, and the optical power φ4 of the fourth lens 40 to the optical power φ of the optical system within this range, the optical power of the first lens 10, the second lens 20, the third lens 30, and the fourth lens 40 can be reasonably allocated, so that the optical system meets the performance requirements of wide angle and small distortion.

[0067] Optionally, the optical power φ5 of the fifth lens 50, the optical power φ6 of the sixth lens 60, the optical power φ7 of the seventh lens 70, the optical power φ8 of the eighth lens 80, and the optical power φ9 of the ninth lens 90 satisfy the following:

[0068] 0.639≤φ5 / (φ6+φ7)≤2.548;

[0069] -1.856≤φ8 / (φ6+φ7)≤-0.166;

[0070] 0.004≤φ9 / (φ6+φ7)≤0.679;

[0071] Thus, by reasonably setting the optical power range of the fifth lens 50, the sixth lens 60, the seventh lens 70, the eighth lens 80 and the ninth lens 90, the transverse chromatic aberration and axial aberration can be better corrected, ensuring that the optical system has no obvious purple fringing.

[0072] Optionally, the refractive index n1 and Abbe number v1 of the first lens 10 satisfy: 1.71≤n1≤1.89, 43.20≤v1≤64.80; the refractive index n2 and Abbe number v2 of the second lens 20 satisfy: 1.64≤n2≤1.67, 48.91≤v2≤61.99; the refractive index n3 and Abbe number v3 of the third lens 30 satisfy: 1.83≤n3≤1.89, 39.70≤v3≤55.30; the refractive index n4 and Abbe number v4 of the fourth lens 40 satisfy: 1.55≤n4≤1.57, 55.42≤v4≤58.78; and the refractive index n5 and Abbe number v5 of the fifth lens 50 satisfy: The refractive index n6 and Abbe number v6 of the sixth lens 60 satisfy the following conditions: 1.59≤n5≤1.92, 40.42≤v5≤71.38; 1.58≤n6≤1.81, 26.50≤v6≤68.50; 1.57≤n7≤1.85, 37.13≤v7≤75.17; 1.55≤n8≤1.71, 14.93≤v8≤42.07; 1.60≤n9≤1.72, 43.85≤v9≤57.65.

[0073] The refractive index is the ratio of the speed of light in a vacuum to the speed of light in the medium, primarily used to describe a material's ability to refract light; different materials have different refractive indices. The Abbe number is an index used to represent the dispersion ability of a transparent medium; the more severe the dispersion, the smaller the Abbe number; conversely, the less severe the dispersion, the larger the Abbe number. Thus, by carefully configuring the refractive indices and Abbe numbers of each lens in an optical system, it is beneficial to achieve miniaturization of the optical system, higher pixel resolution, and reduced lens assembly tolerances.

[0074] Optionally, the sixth lens 60 and the seventh lens 70 are cemented lenses.

[0075] Cemented lenses can be used to minimize or eliminate chromatic aberration. Using cemented lenses in optical systems improves image quality and reduces light energy reflection loss, thereby enhancing the clarity of the image. Furthermore, the use of cemented lenses simplifies the assembly process in optical system manufacturing, improving equipment efficiency. In this embodiment, the image-side surface of the sixth lens 60 is cemented to the object-side surface of the seventh lens 70, i.e., the sixth lens 60 and the seventh lens 70 are cemented together. By assembling the sixth lens 60 and the seventh lens 70 into a cemented lens, the influence of chromatic aberration can be eliminated, reducing tolerance sensitivity; simultaneously, the cemented lens can also balance the overall chromatic aberration of the optical system. Cementing the lenses eliminates the air gap between the two lenses, making the overall optical system compact and meeting the requirements of system miniaturization. Moreover, cementing the lenses reduces tolerance sensitivity issues such as tilting / eccentricity that occur during lens assembly. Exemplarily, the sixth lens 60 and the seventh lens 70 can be supported by spacers or cemented together with adhesive; this embodiment does not specifically limit the cementing method for the sixth lens 60 and the seventh lens 70.

[0076] Optionally, the first lens 10, the second lens 20, the third lens 30, the fifth lens 50, the sixth lens 60 and the seventh lens 70 are all spherical lenses; the fourth lens 40, the eighth lens 80 and the ninth lens 90 are all aspherical lenses.

[0077] Aspherical lenses are typically made of plastic, while spherical lenses are typically made of glass. The material cost of plastic lenses is significantly lower than that of glass lenses. However, plastic lenses are usually injection molded, and mold development costs are high. Therefore, by combining three aspherical lenses and six spherical lenses, the optical imaging system can balance material and mold costs, resulting in a lower overall cost. Simultaneously, spherical glass lenses have high light transmittance, while aspherical plastic lenses are lightweight. The performance of the three plastic lenses and six glass lenses compensates for each other, improving image sharpness to some extent. Furthermore, due to the excellent temperature characteristics of glass, using six spherical lenses ensures stable high and low temperature performance of the optical system.

[0078] Optionally, the horizontal field of view of the optical system is greater than or equal to 90°; the vertical field of view of the optical system is greater than or equal to 75°.

[0079] By setting the horizontal field of view (HFOV) of the optical system to HFOV≥90° and the vertical field of view (VFOV) of the optical system to VFOV≥75°, the optical system can have a large field of view, meeting the requirements for high-quality imaging.

[0080] Optionally, the optical imaging system may also include an aperture stop 100. Adding an aperture stop 100 can adjust the propagation direction of the light beam, which is beneficial for improving image quality. Furthermore, placing the aperture stop 100 at a suitable position helps to improve relative illumination and reduce the angle of the principal rays. The aperture stop 100 may be positioned between the fourth lens 40 and the fifth lens 50, or it may be positioned between the fifth lens 50 and the sixth lens 60; this embodiment of the invention does not specifically limit the placement of the aperture stop 100.

[0081] This invention, through the rational allocation of the optical power of each lens, enables the optical system to possess both low distortion, a large aperture number, a wide field of view, and ultra-high imaging clarity, ensuring that the image does not exhibit significant distortion and that there is no obvious purple fringing in real-world shooting. It can be matched with an imaging sensor with a resolution of 8000*6000 and a pixel size of 0.8um, meeting the requirements for high-quality real-time imaging. Furthermore, this invention, through the combination of 6 spherical lenses and 3 aspherical lenses, can meet the requirements for imaging clarity and high / low temperature performance while reducing costs. In addition, the optical system of this invention can meet the requirements for large target surfaces while maintaining a small size.

[0082] As a feasible implementation method, the design parameters of each lens in the optical system are described below as an example.

[0083] In one exemplary embodiment, Table 1 is related to Figure 1 The specific parameters of each lens in the corresponding optical system.

[0084] Table 1. Parameter design for each lens in the optical system.

[0085] φ1 / φ -0.169 -0.191 -0.132 φ2 / φ -0.241 -0.256 -0.080 φ3 / φ 0.125 0.117 0.216 Φ4 / φ 0.076 -0.378 0.117 φ5 / (φ6+φ7) 2.389 0.639 2.548 φ8 / (φ6+φ7) -1.715 -1.856 -0.166 φ9 / (φ6+φ7) 0.623 0.004 0.679 n1 1.72 1.71 1.89 n2 1.67 1.64 1.67 n3 1.83 1.83 1.89 n4 1.55 1.55 1.57 n5 1.62 1.59 1.92 n6 1.61 1.58 1.81 n7 1.73 1.57 1.85 n8 1.7 1.55 1.71 n9 1.68 1.60 1.72 v1 63 43.20 64.80 v2 60.9 48.91 61.99 v3 54 39.70 55.30 v4 57 55.42 58.78 v5 68.8 40.42 71.38 v6 65 26.50 68.50 v7 40.3 37.13 75.17 v8 19.3 14.93 42.07 v9 56.5 43.85 57.65

[0086] The optical system of this embodiment has a focal length f of 3mm, an aperture number F of 1.8, a total optical length TTL of 35mm, an optical target surface of Φ8.4mm, a horizontal field of view (HFOV) of 96.72°, a vertical field of view (VFOV) of 79.78°, and optical distortion as low as -5.5%.

[0087] Table 2 shows the design parameters for the surface type, radius of curvature, thickness, material, semi-diameter, and K-coefficient of each lens in an optical system corresponding to Table 1.

[0088] Table 2. One design parameter for each lens in the optical system.

[0089] 1 spherical 15.1910 0.8169 1.717140 63.000016 9.0209 2 spherical 6.7815 4.2046 6.5016 3 spherical 26.3146 0.7975 1.672241 60.853656 6.2279 4 spherical 6.2934 3.3840 5.1731 5 spherical -23.9084 3.0042 1.829963 54.000298 5.2071 6 spherical -11.5220 1.1651 5.5426 7 aspherical -12.0675 4.3677 1.546616 57.000339 5.2910 3.2285 8 aspherical -8.7513 6.5714 4.9960 -0.3958 STO PL INFINITY 0.0061 2.2024 10 spherical 9.9898 1.5013 1.619270 68.800632 2.4646 11 spherical -12.1797 0.0987 2.5952 12 spherical 11.6770 2.4582 1.614328 65.000163 2.6504 13 spherical -3.3882 0.7498 1.732220 40.329695 2.6187 14 spherical -18.5725 0.0993 2.6910 15 aspherical 10.1421 0.7750 1.704092 19.296719 2.6797 -1.4375 16 aspherical 4.6176 0.6754 2.5161 -8.9484 17 aspherical -4.8990 0.8573 1.678244 56.500054 2.5959 -0.4571 18 aspherical -4.3470 2.6542 2.6002 -11.6667 19 spherical INFINITY 0.7000 1.516797 64.212351 4.0355 20 spherical INFINITY 0.1199 4.2866 IMA INFINITY 0.0000 4.2116

[0090] refer to Figure 1The optical system provided in this embodiment includes a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, a fifth lens 50, a sixth lens 60, a seventh lens 70, an eighth lens 80, and a ninth lens 90 arranged sequentially along the optical axis from the object plane to the image plane. Furthermore, a flat glass plate 110 can be disposed between the image plane and the ninth lens 90, which serves to filter light and provide protection. Table 2 shows the optical physical parameters of each lens in the optical system provided in this embodiment, including surface type, half-diameter, thickness, and material. The surface number is determined by the order of the surfaces of each lens. For example, "1" represents the object-side surface of the first lens 10, "2" represents the image-side surface of the first lens 10, "3" represents the object-side surface of the second lens 20, "4" represents the image-side surface of the second lens 20, and so on. "19" represents the object-side surface of the flat glass 110, "20" represents the image-side surface of the flat glass 110, and "IMA" represents the image plane. The radius of curvature represents the degree of curvature of the lens surface. A positive value indicates that the surface bends towards the image plane, and a negative value indicates that the surface bends towards the object plane. The semi-diameter represents the lens size. The thickness represents the central axial distance from the current surface to the next surface. The units for both the semi-diameter and the thickness are millimeters (mm).

[0091] The equation for the shape of the aspherical surface in the optical system of this embodiment is:

[0092]

[0093] Where Z represents the distance sag from the vertex of the aspherical surface at a position of height y along the optical axis; c = 1 / R, where R represents the paraxial radius of curvature of the aspherical surface shape; K represents the conic coefficient; and A, B, C, D, E, and F represent higher-order aspherical coefficients. For example, Table 3 shows the coefficients related to... Figure 1 The aspherical surface profile parameters corresponding to each lens in the optical system shown.

[0094] Table 3. Aspherical surface parameters corresponding to each lens in the optical system.

[0095]

[0096] Where 2.170901E-04 indicates that the coefficient A of face number 7 is 2.170901 × 10 -4 .

[0097] Figure 2 To and Figure 1 A corresponding axial aberration curve for an optical system. Figure 3 To and Figure 1 Field curvature distortion diagram of a corresponding optical system. Figure 4 To and Figure 1A dot diagram corresponding to an optical system; by Figures 2-4 As can be seen, the optical system provided in this embodiment has the performance of low distortion and high imaging clarity while meeting the requirements of low cost and small size.

[0098] In another exemplary embodiment, Figure 5 This is a schematic diagram of another optical system provided in an embodiment of the present invention. Table 4 shows the structure of the optical system. Figure 5 The specific parameters of each lens in the corresponding optical system.

[0099] Table 4. Another parameter design for each lens in the optical system.

[0100] φ1 / φ -0.137 -0.191 -0.132 φ2 / φ -0.095 -0.256 -0.080 φ3 / φ 0.208 0.117 0.216 Φ4 / φ -0.046 -0.378 0.117 φ5 / (φ6+φ7) 0.798 0.639 2.548 φ8 / (φ6+φ7) -1.163 -1.856 -0.166 φ9 / (φ6+φ7) 0.443 0.004 0.679 n1 1.76 1.71 1.89 n2 1.64 1.64 1.67 n3 1.88 1.83 1.89 n4 1.57 1.55 1.57 n5 1.64 1.59 1.92 n6 1.6 1.58 1.81 n7 1.83 1.57 1.85 n8 1.68 1.55 1.71 n9 1.61 1.60 1.72 v1 45 43.20 64.80 v2 50 48.91 61.99 v3 41 39.70 55.30 v4 58.5 55.42 58.78 v5 51.4 40.42 71.38 v6 53.2 26.50 68.50 v7 47 37.13 75.17 v8 17 14.93 42.07 v9 53.6 43.85 57.65

[0101] The optical system of this embodiment has a focal length f of 3mm, an aperture number F of 2.0, a total optical length TTL of 35mm, an optical target surface of Φ8.4mm, a horizontal field of view (HFOV) of 96.37°, a vertical field of view (VFOV) of 79.77°, and optical distortion as low as -5.5%.

[0102] Table 5 shows the design parameters for the surface type, radius of curvature, thickness, material, semi-diameter, and K-coefficient of each lens in an optical system corresponding to Table 4.

[0103] Table 5. Another design parameter for each lens in the optical system.

[0104] 1 spherical 22.3140 3.2124 1.757297 44.999862 13.5765 2 spherical 8.9902 3.4620 8.5930 3 spherical 13.2425 1.1346 1.642916 49.999923 8.3745 4 spherical 7.7646 2.9871 6.9577 5 spherical 17.4486 2.9996 1.878022 40.983700 6.9175 6 spherical -44.5563 0.1642 6.6170 7 aspherical 48.9452 1.5000 1.572400 58.500499 5.5265 66.4330 8 aspherical 3.5590 7.0072 3.4474 -1.2694 STO PL INFINITY 0.0000 1.9918 10 spherical 7.0257 2.0050 1.637630 51.375873 2.3659 11 spherical -14.7076 0.0977 2.6130 12 spherical 8.5890 2.9566 1.600200 53.222212 2.7347 13 spherical -3.1958 0.9740 1.829405 47.000547 2.7169 14 spherical -5.0143 0.0997 2.9223 15 aspherical -20.0448 1.3382 1.681221 16.998237 2.7668 15.2898 16 aspherical 4.5857 0.3177 2.8075 -5.4195 17 aspherical 8.5912 1.2413 1.614840 53.589835 2.9190 -22.1946 18 aspherical -2986.8312 2.6894 3.0223 198.6042 19 spherical INFINITY 0.7000 1.516800 64.198732 4.1102 20 spherical INFINITY 0.1123 4.3123 IMA INFINITY 0.0000 4.2148

[0105] refer to Figure 5The optical system provided in this embodiment includes a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, a fifth lens 50, a sixth lens 60, a seventh lens 70, an eighth lens 80, and a ninth lens 90 arranged sequentially along the optical axis from the object plane to the image plane. Furthermore, a flat glass plate 110 can be disposed between the image plane and the ninth lens 90, which serves to filter light and provide protection. Table 5 shows the optical physical parameters of each lens in the optical system provided in this embodiment, including surface type, half-diameter, thickness, and material. The surface number is determined by the order of the surfaces of each lens. For example, "1" represents the object-side surface of the first lens 10, "2" represents the image-side surface of the first lens 10, "3" represents the object-side surface of the second lens 20, "4" represents the image-side surface of the second lens 20, and so on. "19" represents the object-side surface of the flat glass 110, "20" represents the image-side surface of the flat glass 110, and "IMA" represents the image plane. The radius of curvature represents the degree of curvature of the lens surface. A positive value indicates that the surface bends towards the image plane, and a negative value indicates that the surface bends towards the object plane. The semi-diameter represents the lens size. The thickness represents the central axial distance from the current surface to the next surface. The units for both the semi-diameter and the thickness are millimeters (mm).

[0106] The equation for the shape of the aspherical surface in the optical system of this embodiment is:

[0107]

[0108] Where Z represents the distance sag from the vertex of the aspherical surface at a height of y along the optical axis; c = 1 / R, where R represents the paraxial radius of curvature of the aspherical surface shape; K represents the conic coefficient; and A, B, C, D, E, and F represent higher-order aspherical coefficients. For example, Table 6 shows the coefficients related to... Figure 5 The aspherical surface profile parameters corresponding to each lens in the optical system shown.

[0109] Table 6. Another aspherical surface profile parameter for each lens in the optical system.

[0110]

[0111] Wherein, 9.735910E-04 indicates that the coefficient A of face number 7 is 9.735910 × 10 -4 .

[0112] Figure 6 To and Figure 5 A corresponding axial aberration curve for an optical system. Figure 7 To and Figure 5 Field curvature distortion diagram of a corresponding optical system. Figure 8 To and Figure 5A dot diagram corresponding to an optical system; by Figures 6-8 As can be seen, the optical system provided in this embodiment has the performance of low distortion and high imaging clarity while meeting the requirements of low cost and small size.

[0113] In yet another exemplary embodiment, Figure 9 This is a schematic diagram of another optical system provided in an embodiment of the present invention. Table 7 shows the structure of the optical system. Figure 9 The specific parameters of each lens in the corresponding optical system.

[0114] Table 7. Another parameter design for each lens in the optical system.

[0115] φ1 / φ -0.186 -0.191 -0.132 φ2 / φ -0.185 -0.256 -0.080 φ3 / φ 0.205 0.117 0.216 Φ4 / φ -0.337 -0.378 0.117 φ5 / (φ6+φ7) 0.936 0.639 2.548 φ8 / (φ6+φ7) -0.307 -1.856 -0.166 φ9 / (φ6+φ7) 0.060 0.004 0.679 n1 1.87 1.71 1.89 n2 1.67 1.64 1.67 n3 1.84 1.83 1.89 n4 1.56 1.55 1.57 n5 1.89 1.59 1.92 n6 1.79 1.58 1.81 n7 1.59 1.57 1.85 n8 1.56 1.55 1.71 n9 1.71 1.60 1.72 v1 50 43.20 64.80 v2 55 48.91 61.99 v3 43 39.70 55.30 v4 55.7 55.42 58.78 v5 43 40.42 71.38 v6 30 26.50 68.50 v7 72 37.13 75.17 v8 40 14.93 42.07 v9 45 43.85 57.65

[0116] The optical system of this embodiment has a focal length f of 3mm, an aperture number F of 2.0, a total optical length TTL of 35mm, an optical target surface of Φ8.4mm, a horizontal field of view (HFOV) of 96.1°, a vertical field of view (VFOV) of 79.36°, and optical distortion as low as -5%.

[0117] Table 8 shows the design parameters for the surface type, radius of curvature, thickness, material, semi-diameter, and K-coefficient of each lens in an optical system corresponding to Table 7.

[0118] Table 8. Another design parameter for each lens in the optical system.

[0119] 1 spherical 17.5148 1.7304 1.870372 50.000379 10.4425 2 spherical 7.4806 4.2755 7.1346 3 spherical 23.3200 0.7970 1.665967 55.000193 6.9365 4 spherical 7.3347 3.2682 5.9636 5 spherical 107.1675 3.0009 1.844959 42.999785 6.0654 6 spherical -13.9948 0.1000 6.1693 7 aspherical 45.4918 2.1054 1.558408 55.656370 5.5930 29.0632 8 aspherical 4.4576 3.2019 4.1975 -0.3978 9 spherical 29.0237 3.0056 1.889568 43.001184 4.3160 10 spherical -10.9915 3.6610 4.2822 STO PL INFINITY -0.2313 1.8890 12 spherical 6.6040 0.7812 1.789503 29.999049 2.0581 13 spherical 2.7377 2.4237 1.590885 72.001069 2.1331 14 spherical -7.3671 0.2614 2.3987 15 aspherical 11.4592 1.1744 1.560097 39.997254 2.5478 -21.6110 16 aspherical 6.4059 0.8633 2.4478 -3.7500 17 aspherical -9.4372 0.8000 1.707448 45.001348 2.4203 2.5947 18 aspherical -8.9441 3.0000 2.6243 -8.0300 19 spherical INFINITY 0.7000 1.516800 64.198732 4.1155 20 spherical INFINITY 0.0843 4.3224 IMA INFINITY 0.0000 4.2129

[0120] refer to Figure 9The optical system provided in this embodiment includes a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, a fifth lens 50, a sixth lens 60, a seventh lens 70, an eighth lens 80, and a ninth lens 90 arranged sequentially along the optical axis from the object plane to the image plane. Furthermore, a flat glass plate 110 can be disposed between the image plane and the ninth lens 90, which serves to filter light and provide protection. Table 8 shows the optical physical parameters of each lens in the optical system provided in this embodiment, including surface type, half-diameter, thickness, and material. The surface number is determined by the order of the surfaces of each lens. For example, "1" represents the object-side surface of the first lens 10, "2" represents the image-side surface of the first lens 10, "3" represents the object-side surface of the second lens 20, "4" represents the image-side surface of the second lens 20, and so on. "19" represents the object-side surface of the flat glass 110, "20" represents the image-side surface of the flat glass 110, and "IMA" represents the image plane. The radius of curvature represents the degree of curvature of the lens surface. A positive value indicates that the surface bends towards the image plane, and a negative value indicates that the surface bends towards the object plane. The semi-diameter represents the lens size. The thickness represents the central axial distance from the current surface to the next surface. The units for both the semi-diameter and the thickness are millimeters (mm).

[0121] The equation for the shape of the aspherical surface in the optical system of this embodiment is:

[0122]

[0123] Where Z represents the distance sag from the vertex of the aspherical surface at a height of y along the optical axis; c = 1 / R, where R represents the paraxial radius of curvature of the aspherical surface shape; K represents the conic coefficient; and A, B, C, D, E, and F represent higher-order aspherical coefficients. For example, Table 9 shows the coefficients related to... Figure 9 The aspherical surface profile parameters corresponding to each lens in the optical system shown.

[0124] Table 9. Another aspherical surface profile parameter for each lens in the optical system.

[0125]

[0126] Where 2.041346E-04 indicates that the coefficient A of face number 7 is 2.041346 × 10 -4 .

[0127] Figure 10 To and Figure 9 A corresponding axial aberration curve for an optical system. Figure 11 To and Figure 9 Field curvature distortion diagram of a corresponding optical system. Figure 12 To and Figure 9A dot diagram corresponding to an optical system; by Figures 10-12 As can be seen, the optical system provided in this embodiment has the performance of low distortion and high imaging clarity while meeting the requirements of low cost and small size.

[0128] Based on the same inventive concept, this embodiment of the invention also provides a live streaming lens, which includes the optical system of the present invention embodiment, that is, the optical system of the present invention embodiment can be integrated into the lens barrel of the live streaming lens.

[0129] It is understood that when the live streaming lens provided in the embodiments of the present invention includes the optical system provided in the embodiments of the present invention, the live streaming lens has the technical features of the optical system provided in the embodiments of the present invention and can achieve the beneficial effects of the optical system provided in the embodiments of the present invention. The similarities can be referred to the above description, and will not be repeated here.

[0130] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. An optical system, characterized in that, include: A first lens with negative optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with positive optical power, a fifth lens with positive optical power, a sixth lens with positive optical power, a seventh lens with negative optical power, an eighth lens with negative optical power, and a ninth lens with positive optical power, arranged sequentially from the object side to the image side along the optical axis; or, a first lens with negative optical power, a second lens with negative optical power, a third lens with positive optical power, and a fourth lens with negative optical power, arranged sequentially from the object side to the image side along the optical axis. A fifth lens with positive optical power, a sixth lens with positive optical power, a seventh lens with negative optical power, an eighth lens with negative optical power, and a ninth lens with positive optical power; or, a first lens with negative optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with negative optical power, a fifth lens with positive optical power, a sixth lens with negative optical power, a seventh lens with positive optical power, an eighth lens with negative optical power, and a ninth lens with positive optical power, arranged sequentially along the optical axis from the object side to the image side. -0.191≤φ1 / φ≤-0.132; -0.256≤φ2 / φ≤-0.080; 0.117≤φ3 / φ≤0.216; 0.639≤φ5 / (φ6+φ7)≤2.548; -1.856≤φ8 / (φ6+φ7)≤-0.166; 0.004≤φ9 / (φ6+φ7)≤0.679; Wherein, φ1 is the optical power of the first lens, φ2 is the optical power of the second lens, φ3 is the optical power of the third lens, φ is the optical power of the optical system, φ5 is the optical power of the fifth lens, φ6 is the optical power of the sixth lens, φ7 is the optical power of the seventh lens, φ8 is the optical power of the eighth lens, and φ9 is the optical power of the ninth lens. The total length of the optical system is 35mm; the optical target surface of the optical system is Φ8.4mm. The optical system contains nine lenses with optical power.

2. The optical system according to claim 1, characterized in that, 1.78≤f / ENPD≤2.02; Where f is the focal length of the optical system and ENPD is the entrance pupil diameter of the optical system.

3. The optical system according to claim 1, characterized in that, 1.71≤n1≤1.89; 43.20≤v1≤64.80; 1.64≤n²≤1.67; 48.91≤v²≤61.99; 1.83≤n3≤1.89; 39.70≤v3≤55.30; 1.55≤n4≤1.57; 55.42≤v4≤58.78; 1.59≤n5≤1.92; 40.42≤v5≤71.38; 1.58≤n6≤1.81; 26.50≤v6≤68.50; 1.57≤n7≤1.85; 37.13≤v7≤75.17; 1.55≤n8≤1.71; 14.93≤v8≤42.07; 1.60≤n9≤1.72; 43.85≤v9≤57.65; Wherein, n1 is the refractive index of the first lens, v1 is the Abbe number of the first lens; n2 is the refractive index of the second lens, v2 is the Abbe number of the second lens; n3 is the refractive index of the third lens, v3 is the Abbe number of the third lens; n4 is the refractive index of the fourth lens, v4 is the Abbe number of the fourth lens; n5 is the refractive index of the fifth lens, v5 is the Abbe number of the fifth lens; n6 is the refractive index of the sixth lens, v6 is the Abbe number of the sixth lens; n7 is the refractive index of the seventh lens, v7 is the Abbe number of the seventh lens; n8 is the refractive index of the eighth lens, v8 is the Abbe number of the eighth lens; n9 is the refractive index of the ninth lens, v9 is the Abbe number of the ninth lens.

4. The optical system according to claim 1, characterized in that, The sixth lens and the seventh lens are cemented lenses.

5. The optical system according to claim 1, characterized in that, The first lens, the second lens, the third lens, the fifth lens, the sixth lens, and the seventh lens are all spherical lenses; The fourth lens, the eighth lens, and the ninth lens are all aspherical lenses.

6. The optical system according to claim 1, characterized in that, When the optical system includes a first lens with negative optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with positive optical power, a fifth lens with positive optical power, a sixth lens with positive optical power, a seventh lens with negative optical power, an eighth lens with negative optical power, and a ninth lens with positive optical power arranged sequentially along the optical axis from the object side to the image side, the horizontal field of view of the optical system is 96.72° and the vertical field of view is 79.78°; or, When the optical system includes a first lens with negative optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with negative optical power, a fifth lens with positive optical power, a sixth lens with positive optical power, a seventh lens with negative optical power, an eighth lens with negative optical power, and a ninth lens with positive optical power arranged sequentially along the optical axis from the object side to the image side, the horizontal field of view of the optical system is 96.37° and the vertical field of view is 79.77°; or, When the optical system includes a first lens with negative optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with negative optical power, a fifth lens with positive optical power, a sixth lens with negative optical power, a seventh lens with positive optical power, an eighth lens with negative optical power, and a ninth lens with positive optical power arranged sequentially from the object side to the image side along the optical axis, the horizontal field of view of the optical system is 96.1° and the vertical field of view is 79.36°.

7. A live streaming camera, characterized in that, include: The optical system according to any one of claims 1-6.

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