Panoramic optical lens

Abstract

The utility model relates to the technical field of optical lenses, and discloses a panoramic optical lens. The panoramic optical lens comprises 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 or negative focal power, a fifth lens with positive or negative focal power and a sixth lens with positive focal power which are sequentially arranged from an object side to an image side along an optical axis, the panoramic optical lens satisfies the following conditional expressions: 1.8 < = f3 / f < = 3.3; 1.0 < = f4 / f < = 1.9; 0.3 < = f5 / f < = 1.6; 2.3 < = f6 / f < = 5.5; wherein the fourth lens and the fifth lens form a balsaming lens. The maximum field angle of the panoramic optical lens exceeds 200 degrees, and the panoramic optical lens has the advantages of being high in image quality, large in field angle, small in size, low in cost, obvious in imaging picture ghosting eliminating effect and the like, and can meet the use requirements at the temperature ranging from-40 DEG C to 95 DEG C.

Description

Technical Field

[0001] The utility model relates to the technical field of optical lenses, in particular to a panoramic optical lens. Background Art

[0002] With the rapid development and wide use of the automotive industry, users' driving experience of automobiles has been continuously improved, and thus the requirements for enhancing driving safety and vehicle safety have also been continuously increased. In the trend of the integration of intelligent devices and driverless technologies, in-vehicle auxiliary vision systems have developed rapidly in the field of automotive electronics. In order to avoid visual blind spots during driving, 360° panoramic lenses have become the first choice for in-vehicle cameras. However, in-vehicle 360 systems also require high performance indicators to match technological innovation. Currently, the 360° panoramic lenses used have defects such as poor picture quality, narrow field of view, large volume, and high cost, which are technical problems that need to be solved urgently at present. Summary of the Utility Model

[0003] In order to solve the problems of poor picture quality, narrow field of view, large volume, high cost, etc. of the 360° panoramic lenses in the above-mentioned existing technologies, the utility model provides a panoramic optical lens.

[0004] The technical effects to be achieved by the utility model are realized through the following technical aspects:

[0005] In the first aspect, the utility model provides a panoramic optical lens, including: 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 or negative optical power, and a sixth lens with positive optical power, which are sequentially arranged along the optical axis from the object side to the image side;

[0006] The panoramic optical lens satisfies the following conditional expressions:

[0007] 1.8 ≤ f3 / f ≤ 3.3;

[0008] 1.0 ≤ |f4 / f| ≤ 1.9;

[0009] 0.3 ≤ |f5 / f| ≤ 1.6;

[0010] 2.3 ≤ f6 / f ≤ 5.5;

[0011] Wherein, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, and f is the effective focal length of the panoramic optical lens; the fourth lens and the fifth lens form a cemented lens.

[0012] In some optional implementation manners, the panoramic optical lens also satisfies the following conditional expressions:

[0013] -5.0 ≤ f1 / f ≤ -4.5;

[0014] -2.8 ≤ f2 / f ≤ -1.9;

[0015] Wherein, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens.

[0016] In some alternative implementation manners, the panoramic optical lens satisfies the following conditional formula:

[0017] 1.80 ≤ Nd1 ≤ 1.92;

[0018] 1.51 ≤ Nd2 ≤ 1.54;

[0019] 1.93 ≤ Nd3 ≤ 2.01;

[0020] 1.51 ≤ Nd4 ≤ 1.54;

[0021] 1.61 ≤ Nd5 ≤ 1.66;

[0022] 1.51 ≤ Nd6 ≤ 1.54;

[0023] Wherein, Nd1 is the refractive index of the first lens, Nd2 is the refractive index of the second lens, Nd3 is the refractive index of the third lens, Nd4 is the refractive index of the fourth lens, Nd5 is the refractive index of the fifth lens, and Nd6 is the refractive index of the sixth lens.

[0024] In some alternative implementation manners, the panoramic optical lens satisfies the following conditional formula:

[0025] 34 ≤ Vd1 ≤ 48;

[0026] 23 ≤ Vd2 ≤ 57;

[0027] 17.5 ≤ Vd3 ≤ 25.5;

[0028] 52 ≤ Vd4 ≤ 57;

[0029] 21 ≤ Vd5 ≤ 25;

[0030] 52 ≤ Vd5 ≤ 57;

[0031] Wherein, Vd1 is the dispersion coefficient of the first lens, Vd2 is the dispersion coefficient of the second lens, Vd3 is the dispersion coefficient of the third lens, Vd4 is the dispersion coefficient of the fourth lens, Vd5 is the dispersion coefficient of the fifth lens, and Vd6 is the dispersion coefficient of the sixth lens.

[0032] In some alternative implementations, the FOV, f, and h of the panoramic optical lens satisfy the following conditional expressions:

[0033] 48 ≤ (FOV × f) / h ≤ 52;

[0034] where FOV is the maximum field of view angle of the optical lens, and h is the image height corresponding to the maximum field of view angle.

[0035] In some alternative implementations, the BFL and f of the panoramic optical lens satisfy the following conditional expressions:

[0036] 2.1 ≤ BFL / f ≤ 2.52;

[0037] The BFL and TTL of the panoramic optical lens satisfy the following conditional expressions:

[0038] 0.16 ≤ BFL / TTL ≤ 0.21;

[0039] where BFL is the distance from the center of the image side of the sixth lens to the imaging plane of the panoramic optical lens on the optical axis; TTL is the distance from the center of the object side of the first lens to the imaging plane of the panoramic optical lens on the optical axis.

[0040] In some alternative implementations, the object side of the first lens has a convex structure, and the image side of the first lens has a concave structure;

[0041] The object side of the second lens has a convex or concave structure, and the image side of the second lens has a concave structure;

[0042] The object side and the image side of the third lens have convex structures;

[0043] The fourth lens has a positive optical power, and the object side and the image side of the fourth lens have convex structures;

[0044] The fifth lens has a negative optical power, and the object side and the image side of the fifth lens have concave structures;

[0045] The object side and the image side of the sixth lens have convex structures.

[0046] In some alternative implementations, the object side of the first lens has a convex structure, and the image side of the first lens has a concave structure;

[0047] The object side of the second lens has a convex or concave structure, and the image side of the second lens has a concave structure;

[0048] The object side and the image side of the third lens have convex structures;

[0049] The fourth lens has a negative optical power, and the object side and the image side of the fourth lens are concave structures;

[0050] The fifth lens has a positive optical power, and the object side and the image side of the fifth lens are convex structures;

[0051] The object side and the image side of the sixth lens are convex structures.

[0052] In some alternative implementation manners, the first lens and the third lens are spherical lenses;

[0053] The second lens, the fourth lens, the fifth lens, and the sixth lens are aspherical lenses.

[0054] In some alternative implementation manners, a filter is further included, and the filter is disposed outside the image side of the sixth lens.

[0055] In summary, the present utility model has at least the following advantages:

[0056] A panoramic optical lens provided by the present utility model, through the provided first lens and second lens, in cooperation with their focal lengths, converges light rays with a relatively large field of view angle to the rear group system, which is beneficial to the improvement of the field of view angle and can achieve a field of view angle greater than 200°; through the provided third lens and sixth lens, in cooperation with their focal lengths, it is beneficial to correct the aberration and imaging quality of the panoramic optical lens; and the fourth lens and the fifth lens are set as cemented lenses, which is convenient for reducing the tolerance sensitivity of the panoramic optical lens and is beneficial to improving the processing and assembly yield of the panoramic optical lens; so that the maximum field of view angle of the panoramic optical lens of the present utility model exceeds 200°, and has the characteristics of high image quality, large field of view angle, small volume, low cost, obvious ghost image elimination effect in the imaging picture, etc., and can meet the use requirements at a temperature of -40°C to 95°C. In addition, a panoramic optical lens provided by the present utility model, when used in combination with a photosensitive chip, has a relatively large improvement in its resolution and resolving power. And the panoramic optical lens of the present utility model has obvious ghost image elimination in the imaging picture compared with the three-million-vehicle-mounted panoramic lens used in the market, which is beneficial to the reliability of the automatic driving picture acquisition. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 It is a schematic structural diagram of a panoramic optical lens provided in Embodiment 1 of the present utility model.

[0058] Figure 2 It is a schematic diagram of the field curvature and distortion simulation of a panoramic optical lens provided in Embodiment 1 of the present utility model.

[0059] Figure 3 It is a schematic diagram of the vertical aberration simulation of a panoramic optical lens provided in Embodiment 1 of the present utility model.

[0060] Figure 4 Schematic diagram of the MTF curve of a panoramic optical lens provided in Embodiment 1 of the present utility model.

[0061] Figure 5 Schematic diagram of the structure of a panoramic optical lens provided in Embodiment 2 of the present utility model.

[0062] Figure 6 Schematic diagram of the field curvature and distortion simulation of a panoramic optical lens provided in Embodiment 2 of the present utility model.

[0063] Figure 7 Schematic diagram of the lateral aberration simulation of a panoramic optical lens provided in Embodiment 2 of the present utility model.

[0064] Figure 8 Schematic diagram of the MTF curve of a panoramic optical lens provided in Embodiment 2 of the present utility model.

[0065] Figure 9 Schematic diagram of the structure of a panoramic optical lens provided in Embodiment 3 of the present utility model.

[0066] Figure 10 Schematic diagram of the field curvature and distortion simulation of a panoramic optical lens provided in Embodiment 3 of the present utility model.

[0067] Figure 11 Schematic diagram of the lateral aberration simulation of a panoramic optical lens provided in Embodiment 3 of the present utility model.

[0068] Figure 12 Schematic diagram of the MTF curve of a panoramic optical lens provided in Embodiment 3 of the present utility model.

[0069] Markings in the figure:

[0070] L1, the first lens;

[0071] L2, the second lens;

[0072] L3, the third lens;

[0073] L4, the fourth lens;

[0074] L5, the fifth lens;

[0075] L6, the sixth lens;

[0076] L7, the filter;

[0077] L8, the protective glass. Detailed implementation manners

[0078] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. The described embodiments are some, but not all, of the embodiments of the present utility model.

[0079] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0080] Embodiment 1

[0081] In the embodiment of the present utility model, to solve the problems of poor picture quality, narrow field of view, large volume, and high cost existing in the 360° panoramic lens in the prior art, the present utility model provides a panoramic optical lens.

[0082] Please refer to Figure 1 , the panoramic optical lens provided in the embodiment of the present utility model includes: a first lens L1 with a negative focal power, a second lens L2 with a negative focal power, a third lens L3 with a positive focal power, a fourth lens L4 with a positive or negative focal power, a fifth lens L5 with a positive or negative focal power, a sixth lens L6 with a positive focal power, and a filter L7, which are sequentially arranged along the optical axis from the object side to the image side.

[0083] During imaging, light enters the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the filter L7 in sequence from the object side surface S1 of the first lens L1, and finally forms an image on the imaging surface of the panoramic optical lens.

[0084] In this embodiment, the lens focal lengths of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 of the panoramic optical lens are designed to satisfy the following conditional expressions:

[0085] -5.0 ≤ f1 / f ≤ -4.5;

[0086] -2.8 ≤ f2 / f ≤ -1.9;

[0087] 1.8 ≤ f3 / f ≤ 3.3;

[0088] 1.0 ≤ |f4 / f| ≤ 1.9;

[0089] 0.3 ≤ |f5 / f| ≤ 1.6;

[0090] 2.3 ≤ f6 / f ≤ 5.5;

[0091] Wherein, f1 is the effective focal length of the first lens L1, f2 is the effective focal length of the second lens L2, f3 is the effective focal length of the third lens L3, f4 is the effective focal length of the fourth lens L4, f5 is the effective focal length of the fifth lens L5, f6 is the effective focal length of the sixth lens L6, and f is the effective focal length of the panoramic optical lens; the fourth lens L4 and the fifth lens L5 form a cemented lens.

[0092] In this preferred embodiment, the lens shapes of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 of the panoramic optical lens are designed as follows:

[0093] The first lens L1 has a negative optical power. The object side S1 of the first lens L1 is a convex structure, and the image side S2 of the first lens L1 is a concave structure; the second lens L2 has a negative optical power. The object side S3 of the second lens L2 is a convex or concave structure, and the image side S4 of the second lens L2 is a concave structure; the third lens L3 has a positive optical power. The object side S5 and the image side S6 of the third lens L3 are convex structures; the fourth lens L4 has a positive optical power. The object side S8 and the image side S9 of the fourth lens L4 are convex structures; the fifth lens L5 has a negative optical power. The object side S9 and the image side S10 of the fifth lens L5 are concave structures; the sixth lens L6 has a positive optical power. The object side S11 and the image side S12 of the sixth lens L6 are convex structures.

[0094] In addition, as a preferred embodiment, the first lens L1 and the first lens L3 of the panoramic optical lens are spherical lenses; the first lens L2, the fourth lens L4, the fifth lens L5, and the sixth lens are aspherical lenses.

[0095] In this embodiment, by controlling the lens focal lengths and lens shapes of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6, it has an obvious effect on eliminating ghost images, making the imaging picture clearer and cleaner, eliminating some stray light in terms of design, and being beneficial to the promotion of autonomous driving.

[0096] Moreover, in this embodiment, in the above parameter design, the shape design of the first lens L1 and the second lens L2, by matching their lens focal lengths, converges the light rays with a larger field of view to the rear group system, which is beneficial to the improvement of the field of view and can achieve a field of view greater than 200°; the shape design of the third lens L3 and the sixth lens L6, by matching their lens focal lengths, is beneficial to correcting the aberrations of the panoramic optical lens and improving the imaging quality; and the fourth lens L4 and the fifth lens L5 are combined into a cemented lens, which is convenient for reducing the tolerance sensitivity of the panoramic optical lens and is beneficial to improving the processing and assembly yield.

[0097] In some alternative embodiments, the refractive indices of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 of the panoramic optical lens are also designed to satisfy the following conditional expressions:

[0098] 1.80 ≤ Nd1 ≤ 1.92;

[0099] 1.51 ≤ Nd2 ≤ 1.54;

[0100] 1.93 ≤ Nd3 ≤ 2.01;

[0101] 1.51 ≤ Nd4 ≤ 1.54;

[0102] 1.61 ≤ Nd5 ≤ 1.66;

[0103] 1.51 ≤ Nd6 ≤ 1.54;

[0104] Wherein, Nd1 is the refractive index of the first lens L1, Nd2 is the refractive index of the second lens L1, Nd3 is the refractive index of the third lens L3, Nd4 is the refractive index of the fourth lens L4, Nd5 is the refractive index of the fifth lens L5, and Nd6 is the refractive index of the sixth lens L6.

[0105] In the above parameter design, the structural design of the first lens L1 and the second lens L1, by matching the lens refractive indices, is beneficial to reducing the head size of the panoramic optical lens and achieving miniaturization; the selection of the refractive indices of the third lens L3, the fourth lens L4, the fifth lens L5, and / or the sixth lens L6 is beneficial to correcting the spherical aberration of the panoramic optical lens and making the imaging picture clearer.

[0106] In some alternative embodiments, the dispersion coefficients of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 of the panoramic optical lens are also designed to satisfy the following conditional expressions:

[0107] 34 ≤ Vd1 ≤ 48;

[0108] 23 ≤ Vd2 ≤ 57;

[0109] 17.5 ≤ Vd3 ≤ 25.5;

[0110] 52 ≤ Vd4 ≤ 57;

[0111] 21 ≤ Vd5 ≤ 25;

[0112] 52 ≤ Vd5 ≤ 57;

[0113] Wherein, Vd1 is the dispersion coefficient of the first lens L1, Vd2 is the dispersion coefficient of the second lens L2, Vd3 is the dispersion coefficient of the third lens L3, Vd4 is the dispersion coefficient of the fourth lens L4, Vd5 is the dispersion coefficient of the fifth lens L5, and Vd6 is the dispersion coefficient of the sixth lens L6.

[0114] In the above parameter design, the structural design of the third lens L3, the fourth lens L4, and the fifth lens L5, by matching the lens dispersion coefficients, is beneficial to correcting the chromatic aberration of the panoramic optical lens and making the imaging picture clearer.

[0115] In some alternative embodiments, the following parameters of the panoramic optical lens are also designed:

[0116] Make the FOV, f, and h of the panoramic optical lens satisfy the following conditional expressions:

[0117] 48 ≤ (FOV × f) / h ≤ 52;

[0118] Wherein, FOV is the maximum field of view angle of the optical lens, and h is the image height corresponding to the maximum field of view angle.

[0119] Make the BFL and f of the panoramic optical lens satisfy the following conditional expressions:

[0120] 2.1 ≤ BFL / f ≤ 2.52;

[0121] Make the BFL and TTL of the panoramic optical lens satisfy the following conditional expressions:

[0122] 0.16 ≤ BFL / TTL ≤ 0.21;

[0123] Wherein, BFL is the distance from the center of the image side of the sixth lens L6 to the imaging surface of the panoramic optical lens on the optical axis; TTL is the distance from the center of the object side of the first lens L1 to the imaging surface of the panoramic optical lens on the optical axis.

[0124] A panoramic optical lens provided by an embodiment of the present invention has obvious ghost elimination in the imaging picture, which is beneficial to the reliability of the automatic driving picture acquisition. This panoramic optical lens adopts a combination of two glass spherical lenses and four plastic aspherical lenses, has good processability, low cost, a field of view angle > 200°, and a small volume, which is beneficial to the miniaturization of the module.

[0125] In this embodiment, based on the above design of the shape and related parameters of the panoramic optical lens, the parameter design of the panoramic optical lens is as follows:

[0126] Table 1: The focal length design of the panoramic optical lens protected by Embodiment 1 is as follows:

[0127] Example 1 Lower limit Upper limit f1 / f -4.81 -5.0 -4.5 f2 / f -1.96 -2.8 -1.9 f3 / f 2.56 1.8 3.3 |f4 / f| 1.58 1.0 1.9 |f5 / f| 1.35 0.3 1.6 F6 / f 2.38 2.3 5.5

[0128] Table 2: A set of design values of the panoramic optical lens protected by Embodiment 1:

[0129]

[0130]

[0131] In Table 2 above, the surface numbers are numbered according to the surface order of each lens. Among them, "S1" represents the object side surface of the first lens L1, "S2" represents the image side surface of the first lens L1, and so on; the radius of curvature represents the degree of curvature of the lens surface. A positive value indicates that the surface bends towards the image side, and a negative value indicates that the surface bends towards the object side. Among them, "PL" represents that the surface is a plane and the radius of curvature is infinite; the thickness represents the central axial distance from the current surface to the next surface, the refractive index represents the ability of the material between the current surface and the next surface to deflect light, a space represents that the current position is air and the refractive index is 1; the Abbe number represents the dispersion characteristic of the material between the current surface and the next surface to light, and a space represents that the current position is air; the k value represents the numerical value of the best-fitting conic coefficient of the aspheric surface.

[0132] The aspheric conic coefficient can be defined by the following aspheric formula, but is not limited to the following representation:

[0133]

[0134] Among them, z is the axial sagittal height of the aspheric surface in the Z direction; r is the height of the aspheric surface; c is the curvature of the fitting spherical surface, which is numerically the reciprocal of the radius of curvature; k is the fitting conic coefficient; A - I are the coefficients of the 4th, 6th, 8th, 10th, 12th, 14th, and 16th order terms of the aspheric polynomial.

[0135] Table 3: A set of design values of the aspheric coefficients in the panoramic optical lens protected by Embodiment 1:

[0136]

[0137]

[0138] Table 4: Other optical information table of the panoramic optical lens protected by Embodiment 1:

[0139] TTL 16.84 FOV 200 D 13.7 f 1.33 BFL 2.86 h 5.5 (FOV×f) / h 48.36 BFL / f 2.15 BFL / TTL 0.17

[0140] D in Table 4 is the optical effective aperture of the first lens L1.

[0141] In this embodiment, based on the shape design of the panoramic optical lens and in combination with the above parameter design, Figure 2 from the field curvature and distortion simulation schematic diagrams of the described panoramic optical lens, it can be seen that Figure 2 in, in the left coordinate system, the horizontal coordinate represents the magnitude of the field curvature of the large field-of-view panoramic optical lens, with the unit of mm; the vertical coordinate represents the normalized image height, and 0 represents on the optical axis; in the right coordinate system, the horizontal coordinate represents the magnitude of the distortion (F-θ), with the unit of %; the vertical coordinate represents the normalized image height. From Figure 2 it can be seen that the field curvature of different wavelengths is within ±0.1 mm, indicating that the field curvature of the large field-of-view panoramic optical lens is effectively controlled. At the same time, the distortion (F-θ) curves of each wavelength coincide, indicating that the distortion of the large field-of-view panoramic optical lens at each wavelength is well controlled, and a good linear relationship is obtained between the image height and the field angle.

[0142] Combined with Figure 3 the vertical aberration simulation schematic diagram of the described panoramic optical lens, it can be seen that Figure 3 in, the vertical direction represents the normalization of the aperture, 0 represents on the optical axis, and the vertex in the vertical direction represents the maximum pupil radius; the horizontal direction represents the offset relative to the ideal focus, with the unit of millimeters (mm). The different linear curves in the figure represent different wavelengths of the panoramic optical lens imaging. From Figure 3 it can be seen that the vertical aberration of different wavelengths is controlled within the range of ±0.1 mm, indicating that the spherical aberration of the panoramic optical lens at each wavelength is well controlled.

[0143] Combined with Figure 4 the MTF curve schematic diagram of the described panoramic optical lens, it can be seen that Figure 4 in, the MTF can represent the comprehensive imaging quality of the panoramic optical lens. The higher the MTF value, the clearer the imaging. As Figure 4 shown, the horizontal coordinate represents the spatial frequency, with the unit of lp / mm; the vertical coordinate represents the normalized MTF (OTF coefficient), without a unit; where T represents meridional and S represents sagittal; different lines represent different fields of view. From Figure 4 it can be seen that the panoramic optical lens has good imaging quality within the field of view range.

[0144] Embodiment 2

[0145] This embodiment discloses a panoramic optical lens, which optimizes the structure of the panoramic optical lens on the basis of Embodiment 1.

[0146] In this embodiment, as Figure 5As shown, the panoramic optical lens further includes a protective glass L8, and the protective glass L8 is disposed outside the filter L7.

[0147] In this embodiment, the relevant parameter design of the panoramic optical lens is as follows:

[0148] Table 5: The focal length design of the panoramic optical lens protected by Embodiment 2 is as follows:

[0149] Example 2 Lower limit Upper limit f1 / f -4.90 -5.0 -4.5 f2 / f -2.14 -2.8 -1.9 f3 / f 3.24 1.8 3.3 |f4 / f| 1.80 1.0 1.9 |f5 / f| 1.53 0.3 1.6 F6 / f 2.35 2.3 5.5

[0150] Table 6: A design value of the panoramic optical lens protected by Embodiment 2:

[0151]

[0152]

[0153] In Table 2 above, the surface serial numbers are numbered according to the surface order of each lens. Among them, "S1" represents the object side of the first lens L1, "S2" represents the image side of the first lens L1, and so on; the radius of curvature represents the degree of curvature of the lens surface. A positive value represents that the surface bends towards the image side, and a negative value represents that the surface bends towards the object side. Among them, "PL" represents that the surface is a plane and the radius of curvature is infinite; the thickness represents the central axial distance from the current surface to the next surface, the refractive index represents the ability of the material between the current surface and the next surface to deflect light, and the space represents that the current position is air and the refractive index is 1; the Abbe number represents the dispersion characteristic of the material between the current surface and the next surface to light, and the space represents that the current position is air; the k value represents the numerical value of the best fitting conic coefficient of the aspheric surface.

[0154] The aspheric conic coefficient can be defined by the following aspheric formula, but is not limited to the following representation:

[0155]

[0156] Among them, z is the axial sagittal height in the Z direction of the aspheric surface; r is the height of the aspheric surface; c is the curvature of the fitting spherical surface, which is numerically the reciprocal of the radius of curvature; k is the fitting conic coefficient; A - I are the coefficients of the 4th, 6th, 8th, 10th, 12th, 14th, and 16th order terms of the aspheric polynomial.

[0157] Table 7: A design value of the aspheric coefficients in the panoramic optical lens protected by Embodiment 2:

[0158]

[0159] Table 8: Other optical information table of the panoramic optical lens protected by Embodiment 2:

[0160] TTL 16.75 FOV 200 D 13.8 F 1.35 BFL 3.4 h 5.48 (FOV×f) / h 49.27 BFL / f 2.52 BFL / TTL 0.20

[0161] D in Table 8 is the optical effective aperture of the first lens L1.

[0162] In this embodiment, based on the shape design of the panoramic optical lens and combined with the above parameter design, Figure 6 from the field curvature and distortion simulation schematic diagrams of the described panoramic optical lens, it can be seen that Figure 6 in, in the left coordinate system, the horizontal coordinate represents the magnitude of the field curvature of the large field-of-view panoramic optical lens, with the unit of mm; the vertical coordinate represents the normalized image height, and 0 represents on the optical axis; in the right coordinate system, the horizontal coordinate represents the magnitude of the distortion (F-θ), with the unit of %; the vertical coordinate represents the normalized image height. From Figure 6 it can be seen that the field curvature of different wavelengths is within ±0.2 mm, indicating that the field curvature of the large field-of-view panoramic optical lens is effectively controlled. At the same time, the distortion (F-θ) curves of each wavelength coincide, indicating that the distortion of the large field-of-view panoramic optical lens at each wavelength is well controlled, and a good linear relationship is obtained between the image height and the field angle.

[0163] Combined with Figure 7 the vertical aberration simulation schematic diagram of the described panoramic optical lens, it can be seen that Figure 7 in, the vertical direction represents the normalization of the aperture, 0 represents on the optical axis, and the vertex in the vertical direction represents the maximum pupil radius; the horizontal direction represents the offset relative to the ideal focus, with the unit of millimeter (mm). Different linear curves in the figure represent different wavelengths of the panoramic optical lens imaging. From Figure 7 it can be seen that the vertical aberration of different wavelengths is controlled within the range of ±0.1 mm, indicating that the spherical aberration of the panoramic optical lens at each wavelength is well controlled.

[0164] Combined with Figure 8 the MTF curve schematic diagram of the described panoramic optical lens, it can be seen that Figure 8 in, the MTF can represent the comprehensive imaging quality of the panoramic optical lens. The higher the MTF value, the clearer the imaging. As Figure 8 shown, the horizontal coordinate represents the spatial frequency, with the unit of lp / mm; the vertical coordinate represents the normalized MTF (OTF coefficient), without a unit; where T represents meridional and S represents sagittal; different lines represent different fields of view. From Figure 8 it can be seen that the panoramic optical lens has good imaging quality within the field of view range.

[0165] Embodiment 3

[0166] This embodiment discloses a panoramic optical lens, which optimizes the shapes of the fourth lens L4 and the fifth lens L5 based on the shape design of the lenses of the panoramic optical lens in Embodiment 1.

[0167] In this embodiment, as Figure 9 shown, the lens shapes of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 of the panoramic optical lens are designed as follows:

[0168] The first lens L1 has a negative optical power. The object side surface of the first lens L1 is a convex structure, and the image side surface of the first lens L1 is a concave structure. The second lens L2 has a negative optical power. The object side surface of the second lens L2 is a convex or concave structure, and the image side surface of the second lens L2 is a concave structure. The third lens L3 has a positive optical power. The object side surface and the image side surface of the third lens L3 are convex structures. The fourth lens L4 has a negative optical power. The object side surface and the image side surface of the fourth lens L4 are concave structures. The fifth lens L5 has a positive optical power. The object side surface and the image side surface of the fifth lens L5 are convex structures. The sixth lens L6 has a positive optical power. The object side surface and the image side surface of the sixth lens L6 are convex structures.

[0169] In this embodiment, based on the above design of the shape and related parameters of the panoramic optical lens, the parameter design of the panoramic optical lens is as follows:

[0170] Table 9: The focal length design of the panoramic optical lens protected by Embodiment 3 is as follows in the table:

[0171] Example 3 Lower limit Upper limit f1 / f -4.52 -5.0 -4.5 f2 / f -2.74 -2.8 -1.9 f3 / f 1.86 1.8 3.3 |f4 / f| 1.05 1.0 1.9 |f5 / f| 0.37 0.3 1.6 F6 / f 5.45 2.3 5.5

[0172] Table 10: A set of design values of the panoramic optical lens protected by Embodiment 3:

[0173]

[0174] In Table 10 above, the surface numbers are numbered according to the surface order of each lens. Among them, "S1" represents the object side surface of the first lens L1, "S2" represents the image side surface of the first lens L1, and so on; the radius of curvature represents the degree of curvature of the lens surface. A positive value represents that the surface bends towards the image side, and a negative value represents that the surface bends towards the object side. Among them, "PL" represents that the surface is a plane and the radius of curvature is infinite; the thickness represents the central axial distance from the current surface to the next surface, the refractive index represents the ability of the material between the current surface and the next surface to deflect light, a space represents that the current position is air and the refractive index is 1; the Abbe number represents the dispersion characteristic of the material between the current surface and the next surface to light, and a space represents that the current position is air; the k value represents the numerical value of the best-fit conic coefficient of the aspherical surface.

[0175] The aspherical conic coefficient can be defined by the following aspherical formula, but is not limited to the following representation:

[0176]

[0177] Among them, z is the axial sagittal height in the Z direction of the aspheric surface; r is the height of the aspheric surface; c is the curvature of the fitted spherical surface, numerically the reciprocal of the radius of curvature; k is the fitted conic coefficient; A - I are the coefficients of the 4th, 6th, 8th, 10th, 12th, 14th, and 16th order terms of the aspheric polynomial.

[0178] Table 11: A set of design values of the aspheric coefficients in the panoramic optical lens protected by Example 3:

[0179]

[0180] Table 12: Other optical information table of the panoramic optical lens protected by Example 3:

[0181]

[0182]

[0183] In Table 12, D is the optical effective aperture of the first lens L1.

[0184] In this embodiment, based on the shape design of the panoramic optical lens and combined with the above parameter design, Figure 10 from the field curvature and distortion simulation diagrams of the described panoramic optical lens, it can be seen that in Figure 10 , in the left coordinate system, the horizontal coordinate represents the magnitude of the field curvature of the large field - of - view panoramic optical lens, with the unit of mm; the vertical coordinate represents the normalized image height, where 0 represents on the optical axis; in the right coordinate system, the horizontal coordinate represents the magnitude of the distortion (F - θ), with the unit of %; the vertical coordinate represents the normalized image height. It can be seen from Figure 10 that the field curvature at different wavelengths is within ±0.2 mm, indicating that the field curvature of the large field - of - view panoramic optical lens is effectively controlled. At the same time, the distortion (F - θ) curves at each wavelength coincide, indicating that the distortion of the large field - of - view panoramic optical lens at each wavelength is well controlled, and a good linear relationship between the image height and the field - of - view angle is obtained.

[0185] Combined with Figure 11 the vertical aberration simulation diagrams of the described panoramic optical lens, it can be seen that in Figure 11 , the vertical direction represents the normalization of the aperture, where 0 represents on the optical axis, and the vertex in the vertical direction represents the maximum pupil radius; the horizontal direction represents the offset relative to the ideal focus, with the unit of millimeter (mm). Different linear curves in the figure represent different wavelengths of the panoramic optical lens imaging. It can be seen from Figure 11 that the vertical aberration at different wavelengths is controlled within the range of ±0.2 mm, indicating that the spherical aberration of the panoramic optical lens at each wavelength is well controlled.

[0186] Combined with Figure 12As can be seen from the schematic diagram of the MTF curve of the panoramic optical lens, in Figure 12 , MTF can represent the comprehensive imaging quality of the panoramic optical lens. The higher the MTF value, the clearer the imaging. As Figure 12 shown, the horizontal coordinate represents the spatial frequency, with the unit of lp / mm; the vertical coordinate represents the normalized MTF (OTF coefficient), without unit; where T represents meridian and S represents sagittal; different lines represent different fields of view. It can be seen from Figure 12 that the panoramic optical lens has good imaging quality within the field of view.

[0187] In the present invention, unless otherwise clearly specified and defined, terms such as "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0188] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of this invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, terms such as "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0189] In addition, terms such as "horizontal", "vertical", "hanging" and other terms do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0190] Although the description of the present invention is carried out in combination with the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications and changes based on the above content. Therefore, all such substitutions, improvements and changes are included in the spirit and scope of the appended claims.

Claims

1. A panoramic optical lens, characterized in that, Including: A first lens with a negative optical power, a second lens with a negative optical power, a third lens with a positive optical power, a fourth lens with a positive or negative optical power, a fifth lens with a positive or negative optical power, and a sixth lens with a positive optical power, which are sequentially arranged from the object side to the image side along the optical axis; The object side surface of the first lens has a convex structure, and the image side surface of the first lens has a concave structure; The object side surface of the second lens has a convex or concave structure, and the image side surface of the second lens has a concave structure; The panoramic optical lens satisfies the following conditional expressions: -5.0 ≤ f1 / f ≤ -4.5; -2.8 ≤ f2 / f ≤ -1.9; 1.8 ≤ f3 / f ≤ 3.3; 1.0 ≤ |f4 / f| ≤ 1.9; 0.3 ≤ |f5 / f| ≤ 1.6; 2.3 ≤ f6 / f ≤ 5.5; Wherein, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, and f is the effective focal length of the panoramic optical lens; the fourth lens and the fifth lens form a cemented lens.

2. The panoramic optical lens according to claim 1, wherein The panoramic optical lens satisfies the following conditional expressions: 1.80 ≤ Nd1 ≤ 1.92; 1.51 ≤ Nd2 ≤ 1.54; 1.93 ≤ Nd3 ≤ 2.01; 1.51 ≤ Nd4 ≤ 1.54; 1.61 ≤ Nd5 ≤ 1.66; 1.51 ≤ Nd6 ≤ 1.54; Wherein, Nd1 is the refractive index of the first lens, Nd2 is the refractive index of the second lens, Nd3 is the refractive index of the third lens, Nd4 is the refractive index of the fourth lens, Nd5 is the refractive index of the fifth lens, and Nd6 is the refractive index of the sixth lens.

3. The panoramic optical lens according to claim 1, wherein The panoramic optical lens satisfies the following conditional expressions: 34 ≤ Vd1 ≤ 48; 23 ≤ Vd2 ≤ 57; 17.5 ≤ Vd3 ≤ 25.5; 52 ≤ Vd4 ≤ 57; 21 ≤ Vd5 ≤ 25; 52 ≤ Vd5 ≤ 57; Wherein, Vd1 is the dispersion coefficient of the first lens, Vd2 is the dispersion coefficient of the second lens, Vd3 is the dispersion coefficient of the third lens, Vd4 is the dispersion coefficient of the fourth lens, Vd5 is the dispersion coefficient of the fifth lens, and Vd6 is the dispersion coefficient of the sixth lens.

4. The panoramic optical lens according to claim 1, wherein The FOV, f, and h of the panoramic optical lens satisfy the following conditional expression: 48 ≤ (FOV × f) / h ≤ 52; Wherein, FOV is the maximum field of view angle of the optical lens, and h is the image height corresponding to the maximum field of view angle.

5. The panoramic optical lens according to claim 1, wherein The BFL of the panoramic optical lens and f satisfy the following conditional expression: 2.1 ≤ BFL / f ≤ 2.52; The BFL of the panoramic optical lens and TTL satisfy the following conditional expression: 0.16 ≤ BFL / TTL ≤ 0.21; Wherein, BFL is the distance from the center of the image side surface of the sixth lens to the imaging surface of the panoramic optical lens on the optical axis; TTL is the distance from the center of the object side surface of the first lens to the imaging surface of the panoramic optical lens on the optical axis.

6. The panoramic optical lens according to claim 1, wherein the object side surface and the image side surface of the third lens are convex structures; the fourth lens has a positive optical power, and the object side surface and the image side surface of the fourth lens are convex structures; the fifth lens has a negative optical power, and the object side surface and the image side surface of the fifth lens are concave structures; the object side surface and the image side surface of the sixth lens are convex structures.

7. The panoramic optical lens according to claim 1, wherein the object side surface and the image side surface of the third lens are convex structures; the fourth lens has a negative optical power, and the object side surface and the image side surface of the fourth lens are concave structures; the fifth lens has a positive optical power, and the object side surface and the image side surface of the fifth lens are convex structures; the object side surface and the image side surface of the sixth lens are convex structures.

8. The panoramic optical lens according to claim 1, characterized in that, The first lens and the third lens are spherical lenses; The second lens, the fourth lens, the fifth lens and the sixth lens are aspherical lenses.

9. The panoramic optical lens according to claim 1, characterized in that, A filter is further included, and the filter is disposed outside the image side surface of the sixth lens.

Images