Optical lens and electronic equipment

Abstract

The invention belongs to the technical field of optics, and particularly relates to an optical lens and electronic equipment. The optical lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens and an eleventh lens which are sequentially and coaxially arranged from an object side to an image side, the first lens has positive focal power; the second lens has negative focal power; the third lens has negative focal power; the fourth lens has positive focal power; the fifth lens has positive focal power; the sixth lens has positive focal power; the seventh lens has negative focal power; the eighth lens has positive focal power; the ninth lens has positive focal power; the tenth lens has positive focal power; the eleventh lens has negative focal power. The distortion curve of the optical lens is monotonically changed in a full view field, and compared with a non-monotonous distortion curve, the monotonous distortion curve is easier to be subjected to high-precision fitting, so that the detection precision is favorably improved.

Description

Technical Field

[0001] The present disclosure relates to the field of optical technologies, and in particular, to an optical lens and an electronic device. Background Art

[0002] With the rapid development of image processing and computer technologies, machine vision technology has been widely integrated into multiple fields such as industrial automation, intelligent manufacturing, and quality inspection. In this technical system, the lens, as the core optical component, directly affects the imaging quality and recognition accuracy.

[0003] In order to meet the continuously upgraded requirements of precision manufacturing and intelligent detection, optical lenses are gradually developing towards larger field of view angles, better resolutions, higher stabilities, and smaller volumes. In related technologies, lenses with larger field of view angles have problems such as low three-dimensional reconstruction fitting accuracy, resulting in poor accuracy of the lenses. Summary of the Invention

[0004] The present disclosure provides an optical lens and an electronic device with high three-dimensional reconstruction fitting accuracy.

[0005] To achieve the above object, the present disclosure adopts the following technical solutions:

[0006] The first aspect of the present disclosure provides an optical lens, including:

[0007] An aperture stop and a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, and an eleventh lens coaxially arranged in sequence from the object side to the image side; the aperture stop is disposed between the fifth lens and the sixth lens;

[0008] The first lens has a positive optical power; the second lens has a negative optical power; the third lens has a negative optical power; the fourth lens has a positive optical power; the fifth lens has a positive optical power; the sixth lens has a positive optical power; the seventh lens has a negative optical power; the eighth lens has a positive optical power; the ninth lens has a positive optical power; the tenth lens has a positive optical power; the eleventh lens has a negative optical power;

[0009] The distortion curve of the optical lens changes monotonically across the entire field of view.

[0010] Compared with the prior art, the optical lens provided by the first aspect of the present disclosure has the following advantages:

[0011] The optical lens provided by the present disclosure has a first lens with a positive optical power. The main function of the first lens is to provide a large negative distortion to compensate for the large amount of positive distortion generated by other lenses. The second lens has a negative optical power. The main function of the second lens is to collect off-axis large-angle light beams and make them enter the lens, thereby realizing the miniaturization of the optical path structure. The main functions of the third lens and the fourth lens are to deflect the light angle, and together with the fifth lens with a positive optical power, make the light enter the aperture smoothly. The sixth lens has a positive optical power, and the main functions of the seventh lens and the eighth lens are to make the light trend exiting the aperture gentle and perform a certain correction on chromatic aberration. The ninth lens has a positive optical power, and the main functions of the tenth lens and the eleventh lens are to each assume a certain converging ability through the distribution of optical power, and perform a great degree of correction on chromatic aberration through different glass combinations, which can reduce the degree of light refraction through the lens, thereby reducing the sensitivity of the system tolerance, and converge the light on the image plane. The distortion curve of the optical lens changes monotonically across the entire field of view. Compared with a non-monotonic distortion curve, a monotonic distortion curve is easier to fit with high precision, which helps to improve the detection accuracy.

[0012] As an improvement to the above optical lens of the present disclosure, the third lens and the fourth lens are cemented lenses and have a positive optical power;

[0013] The seventh lens and the eighth lens are cemented lenses and have a positive optical power;

[0014] The tenth lens and the eleventh lens are cemented lenses and have a positive optical power.

[0015] As an improvement to the above optical lens of the present disclosure, the first lens is a meniscus lens; the second lens is a meniscus lens; the third lens is a biconcave lens; the fourth lens is a biconvex lens; the fifth lens is a meniscus lens or a meniscus lens; the sixth lens is a meniscus lens; the seventh lens is a meniscus lens; the eighth lens is a meniscus lens; the ninth lens is a plano-convex lens or a meniscus lens; the tenth lens is a biconvex lens; the eleventh lens is a meniscus lens.

[0016] As an improvement to the above optical lens of the present disclosure, the radius of curvature R11 of the incident surface of the first lens is 13.8 mm to 21.8 mm, and the radius of curvature R12 of the exit surface is 54.5 mm to 87.1 mm; the radius of curvature R21 of the incident surface of the second lens is 8.9 mm to 17.3 mm, and the radius of curvature R22 of the exit surface is 2.8 mm to 4.8 mm; the radius of curvature R31 of the incident surface of the third lens is -15.7 mm to -4.8 mm, and the radius of curvature R32 of the exit surface is 6.1 mm to 10.7 mm; the radius of curvature R41 of the incident surface of the fourth lens is 6.1 mm to 10.7 mm, and the radius of curvature R42 of the exit surface is -13.1 mm to -5.9 mm; the radius of curvature R51 of the incident surface of the fifth lens is 8.9 mm to 10 mm, and the radius of curvature R52 of the exit surface is less than or equal to -30.9 mm, or the radius of curvature R52 of the exit surface is greater than or equal to 12.8 mm; the radius of curvature R61 of the incident surface of the sixth lens is -14 mm to -4.7 mm, and the radius of curvature R62 of the exit surface is -7.3 mm to -3.6 mm; the radius of curvature R71 of the incident surface of the seventh lens is -4.7 mm to -2.7 mm, and the radius of curvature R72 of the exit surface is -24.3 mm to -13 mm; the radius of curvature R81 of the incident surface of the eighth lens is -24.3 mm to -13 mm, and the radius of curvature R82 of the exit surface is -6.7 mm to -3.9 mm; the radius of curvature R91 of the incident surface of the ninth lens is less than or equal to -190 mm, and the radius of curvature R92 of the exit surface is -14.6 mm to -9 mm; the radius of curvature R101 of the incident surface of the tenth lens is 8.7 mm to 16 mm, and the radius of curvature R102 of the exit surface is -8.5 mm to -4.2 mm; the radius of curvature R111 of the incident surface of the eleventh lens is -8.5 mm to -4.2 mm, and the radius of curvature R112 of the exit surface is -40 mm to -20.6 mm.

[0017] As an improvement of the above optical lens of the present disclosure, the refractive index N1 of the first lens is 1.75, and the Abbe number V1 is 52.3; the refractive index N2 of the second lens is 1.73 to 1.75, and the Abbe number V2 is 52.3 to 54.7; the refractive index N3 of the third lens is 1.92 to 1.95, and the Abbe number V3 is 17.9 to 18.9; the refractive index N4 of the fourth lens is 1.85 to 2.00, and the Abbe number V4 is 23.8 to 31.3; the refractive index N5 of the fifth lens is 1.95, and the Abbe number V5 is 17.9; the refractive index N6 of the sixth lens is 1.88, and the Abbe number V6 is 39.2; the refractive index N7 of the seventh lens is 1.69 to 1.76, and the Abbe number V7 is 26.6 to 31.2; the refractive index N8 of the eighth lens is 1.73 to 1.88, and the Abbe number V8 is 39.2 to 54.7; the refractive index N9 of the ninth lens is 1.75, and the Abbe number V9 is 52.3; the refractive index N10 of the tenth lens is 1.5, and the Abbe number V10 is 81.6; the refractive index N11 of the eleventh lens is 1.81 to 1.85, and the Abbe number V11 is 23.8 to 25.5.

[0018] As an improvement of the above optical lens of the present disclosure, the central thickness GT1 of the first lens is 0.9 mm to 1.8 mm; the central thickness GT2 of the second lens is 0.5 mm to 1.9 mm; the central thickness GT3 of the third lens is 0.5 mm to 1.0 mm; the central thickness GT4 of the fourth lens is 1.1 mm to 2.6 mm; the central thickness GT5 of the fifth lens is 0.7 mm to 2.6 mm; the central thickness GT6 of the sixth lens is 0.6 mm to 1.0 mm; the central thickness GT7 of the seventh lens is 0.6 mm to 1.0 mm; the central thickness GT8 of the eighth lens is 0.9 mm to 1.6 mm; the central thickness GT9 of the ninth lens is 0.7 mm to 1.5 mm; the central thickness GT10 of the tenth lens is 1.7 mm to 3.0 mm; the central thickness GT11 of the eleventh lens is 0.5 mm to 1.0 mm.

[0019] As an improvement to the above optical lens of the present disclosure, the air spacing distance AT1 between the first lens and the second lens along the optical axis is 0.1 mm; the air spacing distance AT2 between the second lens and the third lens along the optical axis is 2.2 mm to 3.6 mm; the air spacing distance AT3 between the fourth lens and the fifth lens along the optical axis is 0.1 mm to 0.8 mm; the air spacing distance AT4 between the fifth lens and the aperture stop along the optical axis is 1 mm to 1.6 mm; the air spacing distance AT5 between the aperture stop and the sixth lens along the optical axis is 0.7 mm to 0.8 mm; the air spacing distance AT6 between the sixth lens and the seventh lens along the optical axis is 0.5 mm to 1.6 mm; the air spacing distance AT7 between the eighth lens and the ninth lens along the optical axis is 0.1 mm to 0.2 mm; the air spacing distance AT8 between the ninth lens and the tenth lens along the optical axis is 0.1 mm to 0.2 mm; the tenth lens and the eleventh lens are cemented lenses; the air spacing distance BFL between the eleventh lens and the image plane along the optical axis is 4 mm to 8 mm.

[0020] As an improvement to the above optical lens of the present disclosure, the focal length f1 of the first lens is 24.2 mm to 42.8 mm; the focal length f2 of the second lens is -5.6 mm to -9.6 mm; the focal length f3 of the third lens is -16.6 mm to -3.4 mm; the focal length f4 of the fourth lens is 4.3 mm to 5.9 mm; the focal length f5 of the fifth lens is 7.3 mm to 27.8 mm; the focal length f6 of the sixth lens is 13.4 mm to 15.9 mm; the focal length f7 of the seventh lens is -6.6 mm to -4.9 mm; the focal length f8 of the eighth lens is 7 mm to 13.2 mm; the focal length f9 of the ninth lens is 11.9 mm to 20.9 mm; the focal length f10 of the tenth lens is 6 mm to 32.2 mm; the focal length f11 of the eleventh lens is -13.5 mm to -6.3 mm.

[0021] As an improvement to the above optical lens of the present disclosure, the first lens and the second lens form a first lens group; the third lens, the fourth lens, and the fifth lens form a second lens group; the sixth lens, the seventh lens, and the eighth lens form a third lens group; the ninth lens, the tenth lens, and the eleventh lens form a fourth lens group.

[0022] As an improvement to the above optical lens of the present disclosure, the focal length fa of the first lens group is -13.8 mm to -8 mm, the focal length fb of the second lens group is 7 mm to 20 mm, the focal length fc of the third lens group is 26.7 mm to 33 mm, and the focal length fd of the fourth lens group is 9.5 mm to 15.6 mm.

[0023] As an improvement of the above optical lens of the present disclosure, the axial distance d12 between the first lens group and the second lens group is 2.2 mm to 3.6 mm, the axial distance d23 between the second lens group and the third lens group is 1.8 mm to 2.3 mm, and the axial distance d34 between the third lens group and the fourth lens group is 0.1 mm.

[0024] As an improvement of the above optical lens of the present disclosure, the focal length fa of the first lens group and the effective focal length f of the optical lens satisfy |fa / f| = 1.8 to 2.1, the focal length fb of the second lens group and the effective focal length f of the optical lens satisfy fb / f = 1.8 to 2.8, the focal length fc of the third lens group and the effective focal length f of the optical lens satisfy fc / f = 3.7 to 7.6, and the focal length fd of the fourth lens group and the effective focal length f of the optical lens satisfy fd / f = 2.1 to 2.5.

[0025] As an improvement of the above optical lens of the present disclosure, the effective focal length f of the optical lens is 3.8 mm to 7.2 mm, the aperture number Fno is F / 1.7 to F / 9, the image plane target size IMG is 6 mm to 10.5 mm, the working wavelength range is 390 nm to 700 nm, the total optical length TTL of the optical lens system is 18 mm to 35 mm, and the back focal length BFL of the system is 4 mm to 8 mm.

[0026] As an improvement of the above optical lens of the present disclosure, the distortion of the optical lens is less than 6%.

[0027] As an improvement of the above optical lens of the present disclosure, the contrast of the MTF of each field of view of the optical lens at a spatial frequency of 110 cycles / mm is greater than 0.3;

[0028] The relative illumination of the full field of view of the optical lens is greater than 85%.

[0029] As an improvement of the above optical lens of the present disclosure, all lenses are made of glass material and all lenses are spherical lenses.

[0030] The second aspect of the present disclosure provides an electronic device, which includes the optical lens described in the first aspect.

[0031] For the electronic device provided by the second aspect of the present disclosure, since it includes the optical lens described in the first aspect, the electronic device provided by the second aspect of the present disclosure also has the same advantages as the optical lens described in the first aspect.

[0032] In addition to the technical problems solved by the present disclosure, the technical features constituting the technical solutions, and the beneficial effects brought by these technical features of the technical solutions described above, other technical problems that can be solved by the optical lens and the electronic device provided by the present disclosure, other technical features included in the technical solutions, and the beneficial effects brought by these technical features will be further described in detail in the specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings required for the description of the embodiments of the present disclosure or the prior art. Obviously, the following drawings are only a part of the embodiments of the present disclosure. These drawings and the text description are not intended to limit the scope of the concept of the present disclosure in any way, but to illustrate the concept of the present disclosure to those skilled in the art by referring to specific embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0034] Figure 1 Structural schematic diagram of the optical lens provided by the embodiment of the present disclosure;

[0035] Figure 2 Distortion diagram of the optical lens in the related art;

[0036] Figure 3 Distortion diagram of the optical lens provided by the embodiment of the present disclosure;

[0037] Figure 4 MTF curve diagram of the optical lens provided by the embodiment of the present disclosure;

[0038] Figure 5 Relative illuminance curve diagram of the optical lens provided by the embodiment of the present disclosure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] With the rapid development of image processing and computer technologies, machine vision technology has been widely integrated into multiple fields such as industrial automation, intelligent manufacturing, and quality inspection. The high-precision, fast response, and stable and reliable characteristics of machine vision technology have played a key role in improving production efficiency and reducing labor costs. In this technical system, the lens, as the core optical component, directly affects the imaging quality and recognition accuracy.

[0040] With the in-depth expansion of industrial lenses in applications such as detection, measurement, and recognition, the lenses are gradually developing towards larger field of view, higher resolution, higher stability, and smaller volume to meet the continuously upgraded requirements of precision manufacturing and intelligent detection.

[0041] In the related art, in order to increase the field of view angle, the lens forcibly gives vignetting to the marginal rays, resulting in a low uniformity of the image plane illuminance. At the same time, in order to reduce the optical distortion of the lens, the distortion curve is compressed, making the distortion curve non-monotonic, resulting in a reduced fitting accuracy during three-dimensional reconstruction.

[0042] To improve certain characteristics of the lens, the complexity of the lens structure is increased, resulting in a high assembly process and poor lens stability, causing the actual imaging performance of the finished lens to be much lower than the designed performance. At the same time, in order to achieve certain characteristic indicators, aspherical lenses are used. Since aspherical glass lenses incur high manufacturing costs and have complex surface shape control, mass production is insufficient; aspherical plastic lenses also have the disadvantages of large temperature drift and fast aging, and cannot meet the requirements of changing application environments.

[0043] In view of this, the embodiments of the present disclosure provide a wide-angle lens with a small volume and high precision, which can meet the requirements of increasing the relative illuminance and its uniformity on the premise of a large field of view angle; at the same time, according to the monotonic distortion curve, the fitting error of three-dimensional reconstruction is reduced. For the lens in the embodiments of the present disclosure, all-glass lenses are used to ensure low cost and stability.

[0044] The optical lens in the embodiments of the present disclosure satisfies clear imaging within a large field of view angle, and thus has the characteristics of high resolution, high uniformity, monotonic distortion, and low cost.

[0045] The embodiments of the present disclosure will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present disclosure and should not be construed as a limitation of the present disclosure.

[0046] Embodiment 1

[0047] The embodiments of the present disclosure provide an optical lens, which includes: an aperture stop and a plurality of lenses with optical power arranged coaxially in sequence from the object side to the image side; there are a plurality of lenses on the side of the aperture stop facing the object side, and a plurality of lenses on the side of the aperture stop facing the image side.

[0048] The distortion curve of the optical lens changes monotonically across the entire field of view. Compared with a non-monotonic distortion curve, a monotonic distortion curve is easier to fit with high precision, which helps to improve the detection accuracy.

[0049] Figure 1 It is a schematic structural diagram of the optical lens provided by the embodiments of the present disclosure.

[0050] Combined with Figure 1, the optical lens of the embodiments of the present disclosure includes a first lens G1, a second lens G2, a third lens G3, a fourth lens G4, a fifth lens G5, a sixth lens G6, a seventh lens G7, an eighth lens G8, a ninth lens G9, a tenth lens G10, and an eleventh lens G11 arranged coaxially in sequence from the object side to the image side; the aperture stop ST is disposed between the fifth lens G5 and the sixth lens G6.

[0051] As Figure 1 shown, a cover glass 12 is disposed between the rear side of the eleventh lens G11 and the image plane 10.

[0052] The first lens G1 has a positive focal power; the second lens G2 has a negative focal power; the third lens G3 has a negative focal power; the fourth lens G4 has a positive focal power; the fifth lens G5 is adjacent to the aperture stop ST and is located on the object side of the aperture stop ST; the sixth lens G6 is adjacent to the aperture stop ST and is located on the image side of the aperture stop ST; the seventh lens G7 has a negative focal power; the eighth lens G8 has a positive focal power; the ninth lens G9 has a positive focal power; the tenth lens G10 has a positive focal power; the eleventh lens G11 has a negative focal power.

[0053] Among them, the first lens G1 has a positive focal power. The main function of the first lens G1 is to provide a large negative distortion to compensate for a large amount of positive distortion generated by other lenses.

[0054] The second lens G2 has a negative focal power. The main function of the second lens G2 is to collect off-axis large-angle light beams and make them enter the lens, thereby realizing the miniaturization of the optical path structure.

[0055] The third lens G3 and the fourth lens G4 are cemented lenses and have a positive focal power; their main function is to realize the deflection of the light angle and, together with the fifth lens G5 having a positive focal power, make the light enter the aperture smoothly.

[0056] The sixth lens G6 has a positive focal power, and the seventh lens G7 and the eighth lens G8 are cemented lenses and have a positive focal power; their main functions are to make the light trend emitted from the aperture stop gentle and perform a certain correction on chromatic aberration.

[0057] The ninth lens G9 has a positive focal power, and the tenth lens G10 and the eleventh lens G11 are cemented lenses and have a positive focal power. Their main function is to make each of them undertake a certain converging ability through the distribution of focal power, and perform a great deal of correction on chromatic aberration through different glass combinations, which can reduce the degree of light refraction through the lens, thereby reducing the sensitivity of the system tolerance and converging the light on the image plane.

[0058] The material of the lens can be colorless optical glass or optical plastic. Optical plastic has low cost in mass production, is easy to process aspherical surfaces, and is light in weight. Optical glass has stable mechanical and thermal properties, and chromatic aberration can be eliminated and imaging quality can be improved through combinations of different refractive indices and Abbe numbers. Industrial robots are used in diverse environments and need to meet high requirements for environmental temperature stability.

[0059] In some embodiments, all lenses are made of glass material and all lenses are spherical lenses. First, compared with plastic material, glass material has higher transmittance and better imaging effect. Second, the physical and chemical stability of glass material is much better than that of plastic material, enabling it to better adapt to various environments and have a longer service life. And glass spherical lenses have much lower cost compared to glass aspherical lenses.

[0060] In some embodiments of the present disclosure, the optical lens includes a first lens group L1, a second lens group L2, a third lens group L3, and a fourth lens group L4 arranged in sequence along the optical path from the object plane to the image plane, which helps to optimize and adjust various parameters of the optical lens.

[0061] Each of the four lens groups is composed of at least one lens, and can include separated lenses and cemented lenses. They can all be spherical lenses, all be aspherical lenses, or be composed of spherical lenses and aspherical lenses together.

[0062] In some embodiments, the first lens G1 and the second lens G2 form the first lens group L1; the third lens G3, the fourth lens G4, and the fifth lens G5 form the second lens group L2; the sixth lens G6, the seventh lens G7, and the eighth lens G8 form the third lens group L3; the ninth lens G9, the tenth lens G10, and the eleventh lens G11 form the fourth lens group L4.

[0063] The focal length fa of the first lens group L1 is -13.8 mm to -8 mm, the focal length fb of the second lens group L2 is 7 mm to 20 mm, the focal length fc of the third lens group L3 is 26.7 mm to 33 mm, and the focal length fd of the fourth lens group L4 is 9.5 mm to 15.6 mm.

[0064] The axial distance d12 between the first lens group L1 and the second lens group L2 is 2.2 mm to 3.6 mm, the axial distance d23 between the second lens group L2 and the third lens group L3 is 1.8 mm to 2.3 mm, and the axial distance d34 between the third lens group L3 and the fourth lens group L4 is 0.1 mm.

[0065] The focal length fa of the first lens group L1 and the effective focal length f of the optical lens satisfy |fa / f| = 1.8 to 2.1. The focal length fb of the second lens group L2 and the effective focal length f of the optical lens satisfy fb / f = 1.8 to 2.8. The focal length fc of the third lens group L3 and the effective focal length f of the optical lens satisfy fc / f = 3.7 to 7.6. The focal length fd of the fourth lens group L4 and the effective focal length f of the optical lens satisfy fd / f = 2.1 to 2.5.

[0066] The effective focal length f of the optical lens is 3.8 mm to 7.2 mm, the aperture number Fno is F / 1.7 to F / 9, the image plane target size IMG is 6 mm to 10.5 mm, the working wavelength band is 390 nm to 700 nm, the total optical length TTL of the optical lens system is 18 mm to 35 mm, and the back focal length BFL of the system is 4 mm to 8 mm.

[0067] In some embodiments, the first lens G1 is a convex-concave lens; the second lens G2 is a convex-concave lens; the third lens G3 is a biconcave lens; the fourth lens G4 is a biconvex lens; the fifth lens G5 is a convex-concave lens or a convex-concave lens; the sixth lens G6 is a concave-convex lens; the seventh lens is a concave-convex lens; the eighth lens is a concave-convex lens; the ninth lens G9 is a plano-convex lens or a concave-convex lens; the tenth lens G10 is a biconvex lens; the eleventh lens G11 is a concave-convex lens. Among them, the third lens G3 and the fourth lens G4 are cemented lenses; the sixth lens G6 and the seventh lens G7 are cemented lenses; the tenth lens G10 and the eleventh lens G11 are cemented lenses.

[0068] Combined Figure 1 , the optical lens of the embodiment of the present disclosure has a simple lens structure form and good processability of the lens while ensuring the optical path size and volume of the lens.

[0069] In some embodiments, the radius of curvature R11 of the incident surface of the first lens G1 is 13.8 mm to 21.8 mm, and the radius of curvature R12 of the exit surface is 54.5 mm to 87.1 mm; the radius of curvature R21 of the incident surface of the second lens G2 is 8.9 mm to 17.3 mm, and the radius of curvature R22 of the exit surface is 2.8 mm to 4.8 mm; the radius of curvature R31 of the incident surface of the third lens G3 is -15.7 mm to -4.8 mm, and the radius of curvature R32 of the exit surface is 6.1 mm to 10.7 mm; the radius of curvature R41 of the incident surface of the fourth lens G4 is 6.1 mm to 10.7 mm, and the radius of curvature R42 of the exit surface is -13.1 mm to -5.9 mm; the radius of curvature R51 of the incident surface of the fifth lens G5 is 8.9 mm to 10 mm, and the radius of curvature R52 of the exit surface is less than or equal to -30.9 mm, or the radius of curvature R52 of the exit surface is greater than or equal to 12.8 mm; the radius of curvature R61 of the incident surface of the sixth lens G6 is -14 mm to -4.7 mm, and the radius of curvature R62 of the exit surface is -7.3 mm to -3.6 mm; the radius of curvature R71 of the incident surface of the seventh lens G7 is -4.7 mm to -2.7 mm, and the radius of curvature R72 of the exit surface is -24.3 mm to -13 mm; the radius of curvature R81 of the incident surface of the eighth lens G8 is -24.3 mm to -13 mm, and the radius of curvature R82 of the exit surface is -6.7 mm to -3.9 mm; the radius of curvature R91 of the incident surface of the ninth lens G9 is less than or equal to -190 mm, and the radius of curvature R92 of the exit surface is -14.6 mm to -9 mm; the radius of curvature R101 of the incident surface of the tenth lens G10 is 8.7 mm to 16 mm, and the radius of curvature R102 of the exit surface is -8.5 mm to -4.2 mm; the radius of curvature R111 of the incident surface of the eleventh lens G11 is -8.5 mm to -4.2 mm, and the radius of curvature R112 of the exit surface is -40 mm to -20.6 mm.

[0070] Among them, in combination with the attached Figure 1 , the incident surface of the lens is the surface of the lens facing the object side; the exit surface of the lens is the surface of the lens facing the image side.

[0071] In some embodiments, the refractive index N1 of the first lens G1 is 1.75, and the Abbe number V1 is 52.3; the refractive index N2 of the second lens G2 is 1.73 - 1.75, and the Abbe number V2 is 52.3 - 54.7; the refractive index N3 of the third lens G3 is 1.92 - 1.95, and the Abbe number V3 is 17.9 - 18.9; the refractive index N4 of the fourth lens G4 is 1.85 - 2.00, and the Abbe number V4 is 23.8 - 31.3; the refractive index N5 of the fifth lens G5 is 1.95, and the Abbe number V5 is 17.9; the refractive index N6 of the sixth lens G6 is 1.88, and the Abbe number V6 is 39.2; the refractive index N7 of the seventh lens G7 is 1.69 - 1.76, and the Abbe number V7 is 26.6 - 31.2; the refractive index N8 of the eighth lens G8 is 1.73 - 1.88, and the Abbe number V8 is 39.2 - 54.7; the refractive index N9 of the ninth lens G9 is 1.75, and the Abbe number V9 is 52.3; the refractive index N10 of the tenth lens G10 is 1.5, and the Abbe number V10 is 81.6; the refractive index N11 of the eleventh lens G11 is 1.81 - 1.85, and the Abbe number V11 is 23.8 - 25.5. By limiting the refractive index and Abbe number of each lens in the embodiments of the present disclosure, the material properties of each lens are thus limited.

[0072] In some embodiments, the central thickness GT1 of the first lens G1 is 0.9 mm - 1.8 mm; the central thickness GT2 of the second lens G2 is 0.5 mm - 1.9 mm; the central thickness GT3 of the third lens G3 is 0.5 mm - 1.0 mm; the central thickness GT4 of the fourth lens G4 is 1.1 mm - 2.6 mm; the central thickness GT5 of the fifth lens G5 is 0.7 mm - 2.6 mm; the central thickness GT6 of the sixth lens G6 is 0.6 mm - 1.0 mm; the central thickness GT7 of the seventh lens G7 is 0.6 mm - 1.0 mm; the central thickness GT8 of the eighth lens G8 is 0.9 mm - 1.6 mm; the central thickness GT9 of the ninth lens G9 is 0.7 mm - 1.5 mm; the central thickness GT10 of the tenth lens G10 is 1.7 mm - 3.0 mm; the central thickness GT11 of the eleventh lens G11 is 0.5 mm - 1.0 mm. Herein, the central thickness of the lens refers to the thickness of the center of the lens along the optical axis direction.

[0073] In some embodiments, the air separation distance AT1 between the first lens G1 and the second lens G2 along the optical axis is 0.1 mm; the air separation distance AT2 between the second lens G2 and the third lens G3 along the optical axis is 2.2 mm to 3.6 mm; the air separation distance AT3 between the fourth lens G4 and the fifth lens G5 along the optical axis is 0.1 mm to 0.8 mm; the air separation distance AT4 between the fifth lens G5 and the aperture stop ST along the optical axis is 1 mm to 1.6 mm; the air separation distance AT5 between the aperture stop ST and the sixth lens G6 along the optical axis is 0.7 mm to 0.8 mm; the air separation distance AT6 between the sixth lens G6 and the seventh lens G7 along the optical axis is 0.5 mm to 1.6 mm; the air separation distance AT7 between the eighth lens G8 and the ninth lens G9 along the optical axis is 0.1 mm to 0.2 mm; the air separation distance AT8 between the ninth lens G9 and the tenth lens G10 along the optical axis is 0.1 mm to 0.2 mm; the tenth lens G10 and the eleventh lens G11 are cemented lenses; the air separation distance BFL between the eleventh lens G11 and the image plane along the optical axis is 4 mm to 8 mm.

[0074] Among them, the air separation distance AT3 between the fourth lens G4 and the aperture stop ST along the optical axis and the air separation distance AT4 between the aperture stop ST and the fifth lens G5 along the optical axis satisfy AT3 + AT4 = 1.8 mm to 2.3 mm.

[0075] In some embodiments, the focal length f1 of the first lens G1 is 24.2 mm to 42.8 mm; the focal length f2 of the second lens G2 is -5.6 mm to -9.6 mm; the focal length f3 of the third lens G3 is -16.6 mm to -3.4 mm; the focal length f4 of the fourth lens G4 is 4.3 mm to 5.9 mm; the focal length f5 of the fifth lens G5 is 7.3 mm to 27.8 mm; the focal length f6 of the sixth lens G6 is 13.4 mm to 15.9 mm; the focal length f7 of the seventh lens G7 is -6.6 mm to -4.9 mm; the focal length f8 of the eighth lens G8 is 7 mm to 13.2 mm; the focal length f9 of the ninth lens G9 is 11.9 mm to 20.9 mm; the focal length f10 of the tenth lens G10 is 6 mm to 32.2 mm; the focal length f11 of the eleventh lens G11 is -13.5 mm to -6.3 mm.

[0076] The parameters of each lens in this embodiment can be calculated using optical design software or through ray tracing algorithms, etc., but the present disclosure does not limit the design tools and design processes.

[0077] Each lens or lens group of the optical lens in the present disclosure has its own unique functional focus. By reasonably distributing the optical power and matching the materials, various aberrations are balanced and kept within the range that does not affect the accuracy.

[0078] The following will describe the performance of the optical lens according to the embodiments of the present disclosure. Among them, Figures 2 to 5 is the distortion diagram of the optical lens in the related art; Figure 2 is the distortion diagram of the optical lens provided by the embodiments of the present disclosure; Figure 3 is the MTF curve graph of the optical lens provided by the embodiments of the present disclosure; Figure 4 is the relative illuminance curve graph of the optical lens provided by the embodiments of the present disclosure. Figure 5

[0079] In Figure 2 and Figure 3 's distortion diagrams, the vertical axis is the field of view, and the horizontal axis is the distortion value. Each curve represents the distortion value at different wavelengths within the working wavelength band.

[0080] In Figure 2 's shown distortion diagram, from the central field of view of 0° to the edge field of view of 37.5°, the distortion first increases from 0 to about 0.7, and then decreases to about 0.1. The distortion curve presents a curve convex to the left.

[0081] Combined with Figure 3 , the optical distortion curve of the entire field of view of the optical lens according to the embodiments of the present disclosure is monotonic. Among them, from the central field of view of 0° to the edge field of view of 37.7°, the distortion gradually increases from 0 to 6%, showing a monotonic change. Compared with the non-monotonic distortion curve, the monotonic distortion curve is helpful for making the correction process simpler during 3D reconstruction. The algorithm can more accurately compensate for the distortion, reduce errors, and can be more easily fitted with high precision, enabling the 3D model to more realistically restore details.

[0082] In some possible embodiments, the distortion of the optical lens is less than 6%, so that the distortion of the entire imaging frame is small.

[0083] As Figure 4 's shown MTF (Modulation Transfer Function) curve graph, the horizontal axis is the spatial frequency, with the unit of line cycle / mm, the vertical axis is the contrast, and the value range is 0 - 1. The solid line and the dashed line represent the meridional and sagittal components of MTF under different fields of view. Among them, the solid line represents the contrast component in the meridional direction, and the meridional direction is perpendicular to the optical axis direction; the dashed line represents the contrast component in the sagittal direction, and the sagittal direction is along the optical axis direction. The higher the two curves and the closer the two curves are, the higher the imaging quality. Combined with Figure 4 , the contrast of the MTF of each field of view of the optical lens at a spatial frequency of 110 cycles / mm is greater than 0.3, and the imaging quality is high.

[0084] Figure 5 ​Relative illuminance curve, where the abscissa is the field of view in degrees. Among them, the 0° position is the central field of view, and 37.7° represents the edge field of view. The ordinate is the relative illuminance, and the value range is 0 to 1. For the optical lens of the embodiment of the present disclosure, the relative illuminance in the central field of view is 100%, and the relative illuminance in the edge field of view is greater than 85%. Thus, the relative illuminance of the entire field of view of the optical lens of the present disclosure is greater than 85%, which can ensure the uniformity of the overall picture, and there will be no vignetting even at the edge of the picture, and the difference between the edge brightness and the central brightness is small.

[0085] For the optical lens of the embodiment of the present disclosure, in the case of the monotonicity of the distortion curve, the contrast of the modulation transfer function of each field of view at a spatial frequency of 110 cycles / mm is greater than 0.3, which can achieve high-resolution imaging, reduce image blurring, make the image clearer, and improve the image quality. Moreover, for the optical lens of the embodiment of the present disclosure, the relative illuminance of the entire field of view is greater than 85%, reducing the vignetting phenomenon at the edge of the image, making the brightness of the entire field of view more uniform, and reducing the need for post-processing brightness correction.

[0086] Therefore, for the optical lens of the embodiment of the present disclosure, its characteristics of high resolution and high relative illuminance result in high imaging quality; the monotonic distortion curve is easier to perform high-precision fitting in three-dimensional reconstruction in combination with algorithms, and a more real and accurate three-dimensional model can be obtained to meet the requirements of precision measurement and detection.

[0087] Example 1

[0088] In the embodiment of the present disclosure, the effective focal length f of the optical lens is 3.8 mm, the f-number Fno is F / 1.7, the image plane size IMG in the image space is 6 mm, the working wavelength range is 390 nm to 700 nm, the total optical length TTL of the system is 18 mm, and the back focal length BFL of the system is 4 mm.

[0089] The focal length fa of the first lens group L1 is -8 mm, the focal length fb of the second lens group L2 is 7 mm, the focal length fc of the third lens group L3 is 29 mm, and the focal length fd of the fourth lens group L4 is 9.5 mm. The axial distance d12 between the first lens group L1 and the second lens group L2 is 2.2 mm, the axial distance d23 between the second lens group L2 and the third lens group L3 is 2.1 mm, and the axial distance d34 between the third lens group L3 and the fourth lens group L4 is 0.1 mm.

[0090] The relationship between the focal length fa of the first lens group L1 of the lens and the effective focal length f of the lens satisfies |fa / f| = 2.1, the relationship between the focal length fb of the second lens group L2 of the lens and the effective focal length f of the lens satisfies fb / f = 1.8, the relationship between the focal length fc of the third lens group L3 of the lens and the effective focal length f of the lens satisfies fc / f = 7.6, and the relationship between the focal length fd of the fourth lens group L4 of the lens and the effective focal length f of the lens satisfies fd / f = 2.5.

[0091] The surface shapes of the lenses in the lens group are as follows: the first lens G1 is a convex-concave lens, the second lens G2 is a convex-concave lens, the third lens G3 is a double-concave lens, the fourth lens G4 is a double-convex lens, the third lens G3 and the fourth lens G4 are cemented lenses, the fifth lens G5 is a double-convex lens, the sixth lens G6 is a concave-convex lens, the seventh lens G7 is a concave-convex lens, the eighth lens G8 is a concave-convex lens, the ninth lens G9 is a plano-convex lens, the tenth lens G10 is a double-convex lens, and the eleventh lens G11 is a concave-convex lens.

[0092] The curvature radii of each lens are as follows: the curvature radius R11 of the incident surface of the first lens G1 is 13.8 mm, and the curvature radius R12 of the exit surface is 54.5 mm; the curvature radius R21 of the incident surface of the second lens G2 is 8.9 mm, and the curvature radius R22 of the exit surface is 2.8 mm; the curvature radius R31 of the incident surface of the third lens G3 is -4.8 mm, and the curvature radius R32 of the exit surface is 10.7 mm; the curvature radius R41 of the incident surface of the fourth lens G4 is 10.7 mm, and the curvature radius R42 of the exit surface is -5.9 mm; the curvature radius R51 of the incident surface of the fifth lens G5 is 8.9 mm, and the curvature radius R52 of the exit surface is -30.9 mm; the curvature radius R61 of the incident surface of the sixth lens G6 is -4.7 mm, and the curvature radius R62 of the exit surface is -3.6 mm; the curvature radius R71 of the incident surface of the seventh lens G7 is -2.7 mm, and the curvature radius R72 of the exit surface is -13 mm; the curvature radius R81 of the incident surface of the eighth lens G8 is -13 mm, and the curvature radius R82 of the exit surface is -3.9 mm; the curvature radius R91 of the incident surface of the ninth lens G9 is infinity, and the curvature radius R92 of the exit surface is -9 mm; the curvature radius R101 of the incident surface of the tenth lens G10 is 8.7 mm, and the curvature radius R102 of the exit surface is -4.2 mm; the curvature radius R111 of the incident surface of the eleventh lens G11 is -4.2 mm, and the curvature radius R112 of the exit surface is -20.6 mm.

[0093] The central thicknesses of the lenses are as follows: the central thickness GT1 of the first lens G1 is 0.9 mm; the central thickness GT2 of the second lens G2 is 0.5 mm; the central thickness GT3 of the third lens G3 is 0.5 mm; the central thickness GT4 of the fourth lens G4 is 1.1 mm; the central thickness GT5 of the fifth lens G5 is 0.7 mm; the central thickness GT6 of the sixth lens G6 is 0.6 mm; the central thickness GT7 of the seventh lens G7 is 0.6 mm; the central thickness GT8 of the eighth lens G8 is 0.9 mm; the central thickness GT9 of the ninth lens G9 is 0.7 mm; the central thickness GT10 of the tenth lens G10 is 1.7 mm; the central thickness GT11 of the eleventh lens G11 is 0.5 mm.

[0094] The air spaces between the lenses are as follows: The air space distance AT1 along the optical axis between the first lens G1 and the second lens G2 is 0.1 mm; the air space distance AT2 along the optical axis between the second lens G2 and the third lens G3 is 2.2 mm; the third lens G3 and the fourth lens G4 are cemented lenses; the air space distance AT3 along the optical axis between the fourth lens G4 and the fifth lens G5 is 0.1 mm; the air space distance AT4 along the optical axis between the fifth lens G5 and the aperture stop ST is 1.3 mm; the air space distance AT5 along the optical axis between the aperture stop ST and the sixth lens G6 is 0.8 mm; the air space distance AT6 along the optical axis between the sixth lens G6 and the seventh lens G7 is 0.5 mm; the seventh lens G7 and the eighth lens G8 are cemented lenses; the air space distance AT7 along the optical axis between the eighth lens G8 and the ninth lens G9 is 0.1 mm; the air space distance AT8 along the optical axis between the ninth lens G9 and the tenth lens G10 is 0.1 mm; the tenth lens G10 and the eleventh lens G11 are cemented lenses; the air space distance BFL along the optical axis between the eleventh lens G11 and the image plane is 4 mm.

[0095] The air space distance AT3 along the optical axis between the fourth lens G4 and the aperture stop ST and the air space distance AT4 along the optical axis between the aperture stop ST and the fifth lens G5 satisfy AT3 + AT4 = 2.1 mm.

[0096] The focal lengths of the lenses are as follows: The focal length f1 of the first lens G1 is 24.2 mm; the focal length f2 of the second lens G2 is -5.6 mm; the focal length f3 of the third lens G3 is -3.4 mm; the focal length f4 of the fourth lens G4 is 4.3 mm; the focal length f5 of the fifth lens G5 is 7.3 mm; the focal length f6 of the sixth lens G6 is 13.4 mm; the focal length f7 of the seventh lens G7 is -4.9 mm; the focal length f8 of the eighth lens G8 is 7 mm; the focal length f9 of the ninth lens G9 is 11.9 mm; the focal length f10 of the tenth lens G10 is 6 mm; the focal length f11 of the eleventh lens G11 is -6.3 mm.

[0097] The optical material parameters of each lens are as follows: the refractive index N1 of the first lens G1 is 1.75, and the Abbe number V1 is 52.3; the refractive index N2 of the second lens G2 is 1.75, and the Abbe number V2 is 52.3; the refractive index N3 of the third lens G3 is 1.95, and the Abbe number V3 is 17.9; the refractive index N4 of the fourth lens G4 is 1.90, and the Abbe number V4 is 31.3; the refractive index N5 of the fifth lens G5 is 1.95, and the Abbe number V5 is 17.9; the refractive index N6 of the sixth lens G6 is 1.88, and the Abbe number V6 is 39.2; the refractive index N7 of the seventh lens G7 is 1.69, and the Abbe number V7 is 31.2; the refractive index N8 of the eighth lens G8 is 1.75, and the Abbe number V8 is 52.3; the refractive index N9 of the ninth lens G9 is 1.75, and the Abbe number V9 is 52.3; the refractive index N10 of the tenth lens G10 is 1.5, and the Abbe number V10 is 81.6; the refractive index N11 of the eleventh lens G11 is 1.85, and the Abbe number V11 is 23.8.

[0098] Example 2

[0099] In the embodiments of the present disclosure, the effective focal length f of the optical lens is 5.5 mm, the aperture number Fno is F / 2.8, the image plane target size IMG is 8 mm, the working wavelength range is 390 nm to 700 nm, the total optical length TTL of the system is 26.5 mm, and the back focal length BFL of the system is 6 mm.

[0100] The focal length fa of the first lens group L1 of the lens is -10 mm, the focal length fb of the second lens group L2 is 12 mm, the focal length fc of the third lens group L3 is 33 mm, and the focal length fd of the fourth lens group L4 is 11.5 mm. The axial distance d12 between the first lens group L1 and the second lens group L2 is 2.6 mm, the axial distance d23 between the second lens group L2 and the third lens group L3 is 2.3 mm, and the axial distance d34 between the third lens group L3 and the fourth lens group L4 is 0.1 mm.

[0101] The relationship between the focal length fa of the first lens group L1 of the lens and the effective focal length f of the lens satisfies |fa / f| = 1.8, the relationship between the focal length fb of the second lens group L2 of the lens and the effective focal length f of the lens satisfies fb / f = 2.2, the relationship between the focal length fc of the third lens group L3 of the lens and the effective focal length f of the lens satisfies fc / f = 6, and the relationship between the focal length fd of the fourth lens group L4 of the lens and the effective focal length f of the lens satisfies fd / f = 2.1.

[0102] The surface shapes of the lenses in the lens group are as follows: The first lens G1 is a convex-concave lens, the second lens G2 is a convex-concave lens, the third lens G3 is a biconcave lens, the fourth lens G4 is a biconvex lens, the third lens G3 and the fourth lens G4 are cemented lenses, the fifth lens G5 is a biconvex lens, the sixth lens G6 is a concave-convex lens, the seventh lens G7 is a concave-convex lens, the eighth lens G8 is a concave-convex lens, the ninth lens G9 is a plano-convex lens, the tenth lens G10 is a biconvex lens, and the eleventh lens G11 is a concave-convex lens.

[0103] The curvature radii of the lenses are as follows: The curvature radius R11 of the incident surface of the first lens G1 is 21.1 mm, and the curvature radius R12 of the exit surface is 87.1 mm; the curvature radius R21 of the incident surface of the second lens G2 is 13.1 mm, and the curvature radius R22 of the exit surface is 3.8 mm; the curvature radius R31 of the incident surface of the third lens G3 is -15.7 mm, and the curvature radius R32 of the exit surface is 10.1 mm; the curvature radius R41 of the incident surface of the fourth lens G4 is 10.1 mm, and the curvature radius R42 of the exit surface is -13.1 mm; the curvature radius R51 of the incident surface of the fifth lens G5 is 10 mm, and the curvature radius R52 of the exit surface is 20 mm; the curvature radius R61 of the incident surface of the sixth lens G6 is -8 mm, and the curvature radius R62 of the exit surface is -5.3 mm; the curvature radius R71 of the incident surface of the seventh lens G7 is -4 mm, and the curvature radius R72 of the exit surface is -24.3 mm; the curvature radius R81 of the incident surface of the eighth lens G8 is -24.3 mm, and the curvature radius R82 of the exit surface is -6.7 mm; the curvature radius R91 of the incident surface of the ninth lens G9 is infinity, and the curvature radius R92 of the exit surface is -11 mm; the curvature radius R101 of the incident surface of the tenth lens G10 is 12.1 mm, and the curvature radius R102 of the exit surface is -6.2 mm; the curvature radius R111 of the incident surface of the eleventh lens G11 is -6.2 mm, and the curvature radius R112 of the exit surface is -33.9 mm.

[0104] The central thicknesses of the lenses are as follows: The central thickness GT1 of the first lens G1 is 1.6 mm; the central thickness GT2 of the second lens G2 is 0.9 mm; the central thickness GT3 of the third lens G3 is 0.8 mm; the central thickness GT4 of the fourth lens G4 is 1.8 mm; the central thickness GT5 of the fifth lens G5 is 1 mm; the central thickness GT6 of the sixth lens G6 is 1 mm; the central thickness GT7 of the seventh lens G7 is 0.8 mm; the central thickness GT8 of the eighth lens G8 is 1.5 mm; the central thickness GT9 of the ninth lens G9 is 1.5 mm; the central thickness GT10 of the tenth lens G10 is 3 mm; the central thickness GT11 of the eleventh lens G11 is 0.8 mm.

[0105] The air gaps between the lenses are as follows: The air gap distance AT1 between the first lens G1 and the second lens G2 along the optical axis is 0.1 mm; the air gap distance AT2 between the second lens G2 and the third lens G3 along the optical axis is 2.6 mm; the third lens G3 and the fourth lens G4 are cemented lenses; the air gap distance AT3 between the fourth lens G4 and the fifth lens G5 along the optical axis is 0.1 mm; the air gap distance AT4 between the fifth lens G5 and the aperture stop ST along the optical axis is 1.6 mm; the air gap distance AT5 between the aperture stop ST and the sixth lens G6 along the optical axis is 0.7 mm; the air gap distance AT6 between the sixth lens G6 and the seventh lens G7 along the optical axis is 0.7 mm; the seventh lens G7 and the eighth lens G8 are cemented lenses; the air gap distance AT7 between the eighth lens G8 and the ninth lens G9 along the optical axis is 0.1 mm; the air gap distance AT8 between the ninth lens G9 and the tenth lens G10 along the optical axis is 0.1 mm; the tenth lens G10 and the eleventh lens G11 are cemented lenses; the air gap distance BFL between the eleventh lens G11 and the image plane along the optical axis is 6 mm.

[0106] The air gap distance AT3 between the fourth lens G4 and the aperture stop ST along the optical axis and the air gap distance AT4 between the aperture stop ST and the fifth lens G5 along the optical axis satisfy AT3 + AT4 = 2.3 mm.

[0107] The focal lengths of the lenses are as follows: The focal length f1 of the first lens G1 is 36.4 mm; the focal length f2 of the second lens G2 is -7.4 mm; the focal length f3 of the third lens G3 is -16.4 mm; the focal length f4 of the fourth lens G4 is 5.9 mm; the focal length f5 of the fifth lens G5 is 20 mm; the focal length f6 of the sixth lens G6 is 14.9 mm; the focal length f7 of the seventh lens G7 is -5.4 mm; the focal length f8 of the eighth lens G8 is 10 mm; the focal length f9 of the ninth lens G9 is 14.5 mm; the focal length f10 of the tenth lens G10 is 24.3 mm; the focal length f11 of the eleventh lens G11 is -9.4 mm.

[0108] The optical material parameters of each lens are as follows: the refractive index N1 of the first lens G1 is 1.75, and the Abbe number V1 is 52.3; the refractive index N2 of the second lens G2 is 1.75, and the Abbe number V2 is 52.3; the refractive index N3 of the third lens G3 is 1.95, and the Abbe number V3 is 17.9; the refractive index N4 of the fourth lens G4 is 2.00, and the Abbe number V4 is 31.3; the refractive index N5 of the fifth lens G5 is 1.95, and the Abbe number V5 is 17.9; the refractive index N6 of the sixth lens G6 is 1.88, and the Abbe number V6 is 39.2; the refractive index N7 of the seventh lens G7 is 1.76, and the Abbe number V7 is 26.6; the refractive index N8 of the eighth lens G8 is 1.88, and the Abbe number V8 is 39.2; the refractive index N9 of the ninth lens G9 is 1.75, and the Abbe number V9 is 52.3; the refractive index N10 of the tenth lens G10 is 1.5, and the Abbe number V10 is 81.6; the refractive index N11 of the eleventh lens G11 is 1.81, and the Abbe number V11 is 25.5.

[0109] Example 3

[0110] In the embodiments of the present disclosure, the effective focal length f of the optical lens is 7.2 mm, the f-number Fno is F / 9, the image plane target size IMG is 10.5 mm, the working wavelength range is 390 nm to 700 nm, the total optical length TTL of the system is 35 mm, and the back focal length BFL of the system is 8 mm.

[0111] The focal length fa of the first lens group L1 of the lens is -13.8 mm, the focal length fb of the second lens group L2 is 20 mm, the focal length fc of the third lens group L3 is 26.7 mm, and the focal length fd of the fourth lens group L4 is 15.6 mm. The axial distance d12 between the first lens group L1 and the second lens group L2 is 3.6 mm, the axial distance d23 between the second lens group L2 and the third lens group L3 is 1.8 mm, and the axial distance d34 between the third lens group L3 and the fourth lens group L4 is 0.1 mm.

[0112] The relationship between the focal length fa of the first lens group L1 of the lens and the effective focal length f of the lens satisfies |fa / f| = 1.9, the relationship between the focal length fb of the second lens group L2 of the lens and the effective focal length f of the lens satisfies fb / f = 2.8, the relationship between the focal length fc of the third lens group L3 of the lens and the effective focal length f of the lens satisfies fc / f = 3.7, and the relationship between the focal length fd of the fourth lens group L4 of the lens and the effective focal length f of the lens satisfies fd / f = 2.2.

[0113] The surface shapes of the lenses in the lens group are as follows: The first lens G1 is a convex-concave lens, the second lens G2 is a convex-concave lens, the third lens G3 is a biconcave lens, the fourth lens G4 is a biconvex lens, the third lens G3 and the fourth lens G4 are cemented lenses, the fifth lens G5 is a convex-concave lens, the sixth lens G6 is a concave-convex lens, the seventh lens G7 is a concave-convex lens, the eighth lens G8 is a concave-convex lens, the ninth lens G9 is a concave-convex lens, the tenth lens G10 is a biconvex lens, and the eleventh lens G11 is a concave-convex lens.

[0114] The curvature radii of each lens are as follows: The curvature radius R11 of the incident surface of the first lens G1 is 21.8 mm, and the curvature radius R12 of the exit surface is 64.3 mm; the curvature radius R21 of the incident surface of the second lens G2 is 17.3 mm, and the curvature radius R22 of the exit surface is 4.8 mm; the curvature radius R31 of the incident surface of the third lens G3 is -15.5 mm, and the curvature radius R32 of the exit surface is 6.1 mm; the curvature radius R41 of the incident surface of the fourth lens G4 is 6.1 mm, and the curvature radius R42 of the exit surface is -11.8 mm; the curvature radius R51 of the incident surface of the fifth lens G5 is 9.5 mm, and the curvature radius R52 of the exit surface is 12.8 mm; the curvature radius R61 of the incident surface of the sixth lens G6 is -14 mm, and the curvature radius R62 of the exit surface is -7.3 mm; the curvature radius R71 of the incident surface of the seventh lens G7 is -4.7 mm, and the curvature radius R72 of the exit surface is -18.3 mm; the curvature radius R81 of the incident surface of the eighth lens G8 is -18.3 mm, and the curvature radius R82 of the exit surface is -6.6 mm; the curvature radius R91 of the incident surface of the ninth lens G9 is -190 mm, and the curvature radius R92 of the exit surface is -14.6 mm; the curvature radius R101 of the incident surface of the tenth lens G10 is 16 mm, and the curvature radius R102 of the exit surface is -8.5 mm; the curvature radius R111 of the incident surface of the eleventh lens G11 is -8.5 mm, and the curvature radius R112 of the exit surface is -40 mm.

[0115] The central thicknesses of each lens are as follows: The central thickness GT1 of the first lens G1 is 1.8 mm; the central thickness GT2 of the second lens G2 is 1.9 mm; the central thickness GT3 of the third lens G3 is 1 mm; the central thickness GT4 of the fourth lens G4 is 2.6 mm; the central thickness GT5 of the fifth lens G5 is 2.6 mm; the central thickness GT6 of the sixth lens G6 is 1 mm; the central thickness GT7 of the seventh lens G7 is 1 mm; the central thickness GT8 of the eighth lens G8 is 1.6 mm; the central thickness GT9 of the ninth lens G9 is 1.3 mm; the central thickness GT10 of the tenth lens G10 is 2.7 mm; the central thickness GT11 of the eleventh lens G11 is 1 mm.

[0116] The air spaces between the lenses are as follows: the air space distance AT1 between the first lens G1 and the second lens G2 along the optical axis is 0.1 mm; the air space distance AT2 between the second lens G2 and the third lens G3 along the optical axis is 3.6 mm; the third lens G3 and the fourth lens G4 are cemented lenses; the air space distance AT3 between the fourth lens G4 and the fifth lens G5 along the optical axis is 0.8 mm; the air space distance AT4 between the fifth lens G5 and the aperture stop ST along the optical axis is 1 mm; the air space distance AT5 between the aperture stop ST and the sixth lens G6 along the optical axis is 0.8 mm; the air space distance AT6 between the sixth lens G6 and the seventh lens G7 along the optical axis is 1.6 mm; the seventh lens G7 and the eighth lens G8 are cemented lenses; the air space distance AT7 between the eighth lens G8 and the ninth lens G9 along the optical axis is 0.2 mm; the air space distance AT8 between the ninth lens G9 and the tenth lens G10 along the optical axis is 0.2 mm; the tenth lens G10 and the eleventh lens G11 are cemented lenses; the air space distance BFL between the eleventh lens G11 and the image plane along the optical axis is 8 mm.

[0117] The air space distance AT3 between the fourth lens G4 and the aperture stop ST along the optical axis and the air space distance AT4 between the aperture stop ST and the fifth lens G5 along the optical axis satisfy AT3 + AT4 = 1.8 mm.

[0118] The focal lengths of the lenses are as follows: the focal length f1 of the first lens G1 is 42.8 mm; the focal length f2 of the second lens G2 is -9.6 mm; the focal length f3 of the third lens G3 is -16.6 mm; the focal length f4 of the fourth lens G4 is 5.1 mm; the focal length f5 of the fifth lens G5 is 27.8 mm; the focal length f6 of the sixth lens G6 is 15.9 mm; the focal length f7 of the seventh lens G7 is -6.6 mm; the focal length f8 of the eighth lens G8 is 13.2 mm; the focal length f9 of the ninth lens G9 is 20.9 mm; the focal length f10 of the tenth lens G10 is 32.2 mm; the focal length f11 of the eleventh lens G11 is -13.5 mm.

[0119] The optical material parameters of each lens are as follows: the refractive index N1 of the first lens G1 is 1.75, and the Abbe number V1 is 52.3; the refractive index N2 of the second lens G2 is 1.73, and the Abbe number V2 is 54.7; the refractive index N3 of the third lens G3 is 1.92, and the Abbe number V3 is 18.9; the refractive index N4 of the fourth lens G4 is 1.85, and the Abbe number V4 is 23.8; the refractive index N5 of the fifth lens G5 is 1.95, and the Abbe number V5 is 17.9; the refractive index N6 of the sixth lens G6 is 1.88, and the Abbe number V6 is 39.2; the refractive index N7 of the seventh lens G7 is 1.7, and the Abbe number V7 is 30.1; the refractive index N8 of the eighth lens G8 is 1.73, and the Abbe number V8 is 54.7; the refractive index N9 of the ninth lens G9 is 1.75, and the Abbe number V9 is 52.3; the refractive index N10 of the tenth lens G10 is 1.5, and the Abbe number V10 is 81.6; the refractive index N11 of the eleventh lens G11 is 1.81, and the Abbe number V11 is 25.5.

[0120] Embodiment 2

[0121] The embodiments of the present disclosure also provide an electronic device, which includes the optical lens of the above embodiment. The structure, function, and effect of the optical lens provided in this embodiment are the same as those of the above embodiment, and specific reference may be made to the above embodiment, which will not be elaborated here.

[0122] In some embodiments, the electronic device of the embodiments of the present disclosure is a camera. The camera can be a monocular camera, a binocular camera, or a 3D camera, etc.

[0123] In the above description, the descriptions with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, without conflict, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0124] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them; although the present disclosure has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. An optical lens, characterized in that: include: an aperture stop and a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens and an eleventh lens which are coaxially arranged in sequence from the object side to the image side; the aperture stop is disposed between the fifth lens and the sixth lens; The first lens has positive optical power; the second lens has negative optical power; the third lens has negative optical power; the fourth lens has positive optical power; the fifth lens has positive optical power; The sixth lens has positive focal power; the seventh lens has negative focal power; The eighth lens has positive focal power; the ninth lens has positive focal power; the tenth lens has positive focal power; and the eleventh lens has negative focal power; The distortion curve of the optical lens changes monotonically over the entire field of view.

2. The optical lens according to claim 1, characterized in that: The third lens and the fourth lens are cemented lenses and have positive refractive power; The seventh lens and the eighth lens are cemented lenses and have positive refractive power; The tenth lens and the eleventh lens are a cemented lens and have positive refractive power.

3. The optical lens according to claim 2, characterized in that: The first lens is a convex-concave lens; the second lens is a convex-concave lens; the third lens is a biconvex lens; the fourth lens is a biconvex lens; the fifth lens is a convex-concave lens or a convex-concave lens; the sixth lens is a concave-convex lens; the seventh lens is a concave-convex lens; the eighth lens is a concave-convex lens; the ninth lens is a plano-convex lens or a concave-convex lens; the tenth lens is a biconvex lens; and the eleventh lens is a concave-convex lens.

4. The optical lens according to claim 3, characterized in that: The curvature radius R11 of the incident surface of the first lens is 13.8mm to 21.8mm, and the curvature radius R12 of the exit surface is 54.5mm to 87.1mm; the curvature radius R21 of the incident surface of the second lens is 8.9mm to 17.3mm, and the curvature radius R22 of the exit surface is 2.8mm to 4.8mm; the curvature radius R31 of the incident surface of the third lens is -15.7mm to -4.8mm, and the curvature radius R32 of the exit surface is 6.1mm ~10.7mm; the curvature radius R41 of the incident surface of the fourth lens is 6.1mm~10.7mm, and the curvature radius R42 of the exit surface is -13.1mm~-5.9mm; the curvature radius R51 of the incident surface of the fifth lens is 8.9mm~10mm, and the curvature radius R52 of the exit surface is less than or equal to ~–30.9mm, or the curvature radius R52 of the exit surface is greater than or equal to 12.8mm; the curvature radius R61 of the incident surface of the sixth lens is The curvature radius R71 of the incident surface of the seventh lens is –4.7mm to –2.7mm, and the curvature radius R72 of the exit surface is –24.3mm to –13mm; the curvature radius R81 of the incident surface of the eighth lens is –24.3mm to –13mm, and the curvature radius R82 of the exit surface is –6.7mm to –3.9mm; the incident surface of the ninth ... The curvature radius R91 of the surface is less than or equal to -190mm, and the curvature radius R92 of the exit surface is -14.6mm to -9mm; the curvature radius R101 of the incident surface of the tenth lens is 8.7mm to 16mm, and the curvature radius R102 of the exit surface is -8.5mm to -4.2mm; the curvature radius R111 of the incident surface of the eleventh lens is -8.5mm to -4.2mm, and the curvature radius R112 of the exit surface is -40mm to -20.6mm.

5. The optical lens according to claim 3, characterized in that: The refractive index N1 of the first lens is 1.75, and the Abbe number V1 is 52.3; the refractive index N2 of the second lens is 1.73-1.75, and the Abbe number V2 is 52.3-54.7; the refractive index N3 of the third lens is 1.92-1.95, and the Abbe number V3 is 17.9-18.9; the refractive index N4 of the fourth lens is 1.85-2.00, and the Abbe number V4 is 23.8-31.3; the refractive index N5 of the fifth lens is 1.95, and the Abbe number V5 is 17.9; the refractive index N6 of the sixth lens is 1.8 8, and the Abbe number V6 is 39.2; the refractive index N7 of the seventh lens is 1.69-1.76, and the Abbe number V7 is 26.6-31.2; the refractive index N8 of the eighth lens is 1.73-1.88, and the Abbe number V8 is 39.2-54.7; the refractive index N9 of the ninth lens is 1.75, and the Abbe number V9 is 52.3; the refractive index N10 of the tenth lens is 1.5, and the Abbe number V10 is 81.6; the refractive index N11 of the eleventh lens is 1.81-1.85, and the Abbe number V11 is 23.8-25.

5.

6. The optical lens according to any one of claims 1 to 5, characterized in that: The effective focal length f of the optical lens is 3.8mm to 7.2mm, the aperture number Fno is F / 1.7 to F / 9, the image target surface size IMG is 6mm to 10.5mm, the working band is 390nm to 700nm, the system optical total length TTL of the optical lens is 18mm to 35mm, and the system back focus BFL is 4mm to 8mm.

7. The optical lens according to any one of claims 1 to 5, characterized in that: The distortion of the optical lens is less than 6%.

8. The optical lens according to any one of claims 1 to 5, characterized in that: The contrast ratio of the MTF of each field of view of the optical lens at a spatial frequency of 110 cycles / mm is greater than 0.3; The relative illumination of the entire viewing field of the optical lens is greater than 85%.

9. The optical lens according to any one of claims 1 to 5, characterized in that: All lenses are made of glass and all lenses are spherical lenses.

10. An electronic device, characterized in that: The electronic device comprises the optical lens according to any one of claims 1 to 9.

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