Large-view-field large-aperture vehicle-mounted panoramic optical lens

Abstract

The invention relates to the technical field of optical lenses, and discloses a large-view-field large-aperture vehicle-mounted panoramic optical lens. Comprising a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with positive focal power or negative focal power and a fifth lens with positive focal power or negative focal power which are sequentially arranged from an object side to an image side along an optical axis, the sixth lens has positive focal power; the seventh lens has negative focal power; wherein the fourth lens and the fifth lens form a balsaming lens; the sixth lens and the seventh lens form a balsaming lens; the aperture value of the panoramic optical lens meets the condition that FNO is less than or equal to 1.68. According to the panoramic optical lens provided by the invention, the shapes and parameters of the plurality of lenses are optimized, so that the panoramic optical lens has the characteristics that the field angle is greater than 200 degrees, and the large aperture value is less than or equal to 1.68; and meanwhile, the system also has the characteristics of high image quality, small size, low cost, obvious ghosting elimination effect of an imaging picture and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of optical lenses, and in particular to a vehicle-mounted panoramic optical lens with a large field of view and a large aperture. Background Art

[0002] With the rapid development and widespread use of the automobile industry, users' driving experience is constantly improving, and the requirements for enhanced driving safety and automobile safety are also constantly increasing. Under the trend of integration of smart devices and unmanned driving technology, vehicle-mounted 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 vehicle-mounted cameras. However, the vehicle-mounted 360 system also requires high performance indicators to match the technology. The current 360° panoramic lenses have defects such as poor picture quality, narrow field of view, large size, and high cost, which are technical problems that urgently need to be solved. Summary of the invention

[0003] In order to solve the defects of the 360° panoramic lens in the above-mentioned prior art such as poor image quality, narrow field of view, large size and high cost, which is a technical problem that urgently needs to be solved, the present invention provides a large field of view and large aperture vehicle-mounted panoramic optical lens.

[0004] The technical effects to be achieved by the present invention are achieved through the following technical aspects:

[0005] In a first aspect, the present invention provides a large-field-of-view and large-aperture vehicle-mounted panoramic optical lens, comprising: a first lens with negative optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with positive optical power or negative optical power, a fifth lens with positive optical power or negative optical power, a sixth lens with positive optical power, and a seventh lens with negative optical power, which are sequentially arranged along an optical axis from an object side to an image side;

[0006] Wherein, the fourth lens and the fifth lens form a cemented lens; the sixth lens and the seventh lens form a cemented lens;

[0007] The aperture value of the panoramic optical lens satisfies: FNO≤1.68.

[0008] In some optional implementations, the FOV, f, and h of the panoramic optical lens satisfy the following conditional formula:

[0009] 50≤(FOV×f) / h≤54;

[0010] Among them, FOV is the maximum field of view of the optical lens, h is the image height corresponding to the maximum field of view, and f is the effective focal length of the panoramic optical lens.

[0011] In some optional implementations,

[0012] The object side surface of the first lens is a convex structure, and the image side surface of the first lens is a concave structure;

[0013] The object side surface of the second lens is a convex structure, and the image side surface of the second lens is a concave structure;

[0014] The object side surface of the third lens is convex or concave, and the image side surface of the third lens is convex;

[0015] The fourth lens has positive refractive power, and the object side surface and the image side surface of the fourth lens are convex structures;

[0016] The fifth lens has negative optical power, and the object side surface and the image side surface of the fifth lens are concave structures;

[0017] The object side surface and the image side surface of the sixth lens are convex structures;

[0018] The object side surface of the seventh lens is a concave structure, and the image side surface of the seventh lens is a convex structure.

[0019] In some optional implementations,

[0020] The object side surface of the first lens is a convex structure, and the image side surface of the first lens is a concave structure;

[0021] The object side surface of the second lens is a convex structure, and the image side surface of the second lens is a concave structure;

[0022] The object side surface of the third lens is convex or concave, and the image side surface of the third lens is convex;

[0023] The fourth lens has negative optical power, and the object side surface and the image side surface of the fourth lens are concave structures;

[0024] The fifth lens has a negative positive focal power, and the object side surface and the image side surface of the fifth lens are convex structures;

[0025] The object side surface and the image side surface of the sixth lens are convex structures;

[0026] The object side surface of the seventh lens is a concave structure, and the image side surface of the seventh lens is a convex structure.

[0027] In some optional implementations, the first lens and the third lens are glass spherical lenses, and the second lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are plastic aspherical lenses.

[0028] In some optional implementations, the panoramic optical lens satisfies the following conditional formula:

[0029] -5.0≤f1 / f≤-4.5;

[0030] -2.8≤f2 / f≤-1.9;

[0031] 1.8≤f3 / f≤3.3;

[0032] 1.0≤|f4 / f|≤1.9;

[0033] 0.3≤|f5 / f|≤1.6;

[0034] 2.3≤f6 / f≤5.5;

[0035] 2.3≤f7 / f≤5.5;

[0036] Among them, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, f7 is the effective focal length of the seventh lens, and f is the effective focal length of the panoramic optical lens.

[0037] In some optional implementations, the panoramic optical lens satisfies the following conditional formula:

[0038] 1.80≤Nd1≤1.92;

[0039] 1.51≤Nd2≤1.54;

[0040] 1.93≤Nd3≤2.01;

[0041] 1.51≤Nd4≤1.54;

[0042] 1.61≤Nd5≤1.66;

[0043] 1.51≤Nd6≤1.54;

[0044] 1.61≤Nd7≤1.66;

[0045] Among them, 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, Nd6 is the refractive index of the sixth lens, and Nd7 is the refractive index of the seventh lens.

[0046] In some optional implementations, the panoramic optical lens satisfies the following conditional formula:

[0047] 34≤Vd1≤48;

[0048] 23≤Vd2≤57;

[0049] 17.5≤Vd3≤25.5;

[0050] 52≤Vd4≤57;

[0051] 21≤Vd5≤25;

[0052] 52≤Vd6≤57;

[0053] 21≤Vd7≤25;

[0054] Among them, 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, Vd6 is the dispersion coefficient of the sixth lens, and Vd7 is the dispersion coefficient of the seventh lens.

[0055] In some optional implementations, the BFL and f of the panoramic optical lens satisfy the following conditional formula:

[0056] 1.66≤BFL / f≤1.8;

[0057] Wherein, BFL is the back focal length of the panoramic optical lens, and f is the effective focal length of the panoramic optical lens.

[0058] In some optional implementations, the BFL and TTL of the panoramic optical lens satisfy the following conditional formula:

[0059] 0.13≤BFL / TTL≤0.15;

[0060] Wherein, BFL is the back focal length of the panoramic optical lens; 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.

[0061] In summary, the present invention has at least the following benefits:

[0062] The present invention provides a large-field-of-view and large-aperture vehicle-mounted panoramic optical lens. A first lens and a second lens are provided and matched with their focal lengths, so that light with a larger field of view angle is converged to a rear lens group, which is beneficial to improving the field of view angle and can achieve a field of view angle greater than 200°. A third lens is provided and matched with its focal length to converge light collected by a front lens group to a rear lens group. A fourth lens and a fifth lens are provided and matched with their focal lengths and are configured as a cemented lens, which is beneficial to correcting aberrations and achieving a large aperture value of less than or equal to 1.68. Finally, a sixth lens and a third lens are provided and matched with their focal lengths and are configured as a cemented lens, which is beneficial to correcting chromatic aberration of the panoramic optical lens and improving the image quality of the panoramic optical lens. At the same time, the cemented lens is beneficial to reducing the assembly sensitivity of the panoramic optical lens and improving the production yield. The panoramic optical lens of the present invention has a maximum field of view of more than 200°, and has the characteristics of high image quality, large field of view, large aperture, small size, low cost, and obvious ghost elimination effect of the imaging picture. It can meet the use requirements at a temperature of -40°C to 95°C, and its imaging picture ghost elimination is obvious, which is conducive to the reliability of automatic driving picture collection. In addition, the panoramic optical lens provided by the present invention is used in conjunction with a photosensitive chip, so that its resolution and resolution are greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 This is a schematic structural diagram of a large-field-of-view and large-aperture vehicle-mounted panoramic optical lens provided in Example 1 of the present invention.

[0064] Figure 2 This is a schematic diagram of field curvature and distortion simulation of a large-field-of-view and large-aperture vehicle-mounted panoramic optical lens provided in Example 1 of the present invention.

[0065] Figure 3 A schematic diagram of vertical axis aberration simulation of a large-field-of-view and large-aperture vehicle-mounted panoramic optical lens provided in Example 1 of the present invention.

[0066] Figure 4 This is a schematic diagram of the MTF curve of a large-field-of-view and large-aperture vehicle-mounted panoramic optical lens provided in Example 1 of the present invention.

[0067] Figure 5 This is a schematic structural diagram of a large-field-of-view and large-aperture vehicle-mounted panoramic optical lens provided in Example 2 of the present invention.

[0068] Figure 6 This is a schematic diagram of field curvature and distortion simulation of a large-field-of-view and large-aperture vehicle-mounted panoramic optical lens provided in Example 2 of the present invention.

[0069] Figure 7 A schematic diagram of vertical axis aberration simulation of a large-field-of-view and large-aperture vehicle-mounted panoramic optical lens provided in Example 2 of the present invention.

[0070] Figure 8 This is a schematic diagram of the MTF curve of a large-field-of-view and large-aperture vehicle-mounted panoramic optical lens provided in Example 2 of the present invention.

[0071] Fig. 9 This is a schematic structural diagram of a large-field-of-view and large-aperture vehicle-mounted panoramic optical lens provided in Example 3 of the present invention.

[0072] Fig.10 This is a schematic diagram of field curvature and distortion simulation of a large-field-of-view and large-aperture vehicle-mounted panoramic optical lens provided in Example 3 of the present invention.

[0073] Fig.11 A schematic diagram of vertical axis aberration simulation of a large-field-of-view and large-aperture vehicle-mounted panoramic optical lens provided in Example 3 of the present invention.

[0074] Fig.12 This is a schematic diagram of the MTF curve of a large-field-of-view and large-aperture vehicle-mounted panoramic optical lens provided in Example 3 of the present invention.

[0075] Markings in the figure:

[0076] L1, first lens;

[0077] L2, second lens;

[0078] L3, third lens;

[0079] L4, fourth lens;

[0080] L5, fifth lens;

[0081] L6, sixth lens;

[0082] L7, seventh lens;

[0083] L8, filter. DETAILED DESCRIPTION

[0084] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The described embodiments are only part of the embodiments of the present invention, not all of them.

[0085] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0086] Example 1

[0087] The embodiments of the present invention provide a large-field-of-view and large-aperture vehicle-mounted panoramic optical lens in order to solve the defects of the 360° panoramic lens in the prior art, such as poor image quality, narrow field of view, large size, and high cost, which are technical problems that urgently need to be solved.

[0088] See also Figure 1 The embodiment of the present invention provides a large-field-of-view and large-aperture automotive panoramic optical lens, comprising: a first lens L1 with negative optical power, a second lens L2 with negative optical power, a third lens L3 with positive optical power, a fourth lens L4 with positive optical power or negative optical power, a fifth lens L5 with positive optical power or negative optical power, a sixth lens L6 with positive optical power, and a seventh lens L7 with negative optical power, which are sequentially arranged along the optical axis from the object side to the image side.

[0089] When 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 seventh lens L7 in sequence from the object-side surface S1 of the first lens L1, and is finally imaged on the imaging surface of the panoramic optical lens.

[0090] Among them, the fourth lens L4 and the fifth lens L5 form a cemented lens, and the sixth lens L6 and the seventh lens L7 form a cemented lens.

[0091] In this embodiment, the aperture of the panoramic optical lens is designed so that the aperture value of the panoramic optical lens satisfies: FNO≤1.68, thereby achieving a large aperture.

[0092] In addition, the maximum field of view of the panoramic optical lens is designed so that the FOV, f and h of the panoramic optical lens meet the following conditional formulas:

[0093] 50≤(FOV×f) / h≤54;

[0094] Among them, FOV is the maximum field of view of the optical lens, h is the image height corresponding to the maximum field of view, and f is the effective focal length of the panoramic optical lens.

[0095] In this embodiment, the first lens L1 and the second lens L2 are designed to have negative focal lengths, so that light with a larger field angle can be converged to the rear lens group more smoothly, which is beneficial to the improvement of the field angle, and a field angle of view greater than 200° can be achieved; the third lens L3 is designed to have positive focal lengths, and is used to converge the light collected by the first lens L1 and the second lens L2 to the rear lens group, and by setting the fourth lens L4 and the fifth lens L5 as a cemented lens, it is beneficial to correct aberrations and achieve a large aperture value of less than or equal to 1.68. Finally, the sixth lens L6 and the third lens L7 set as a cemented lens are beneficial to correcting the chromatic aberration of the panoramic optical lens and improving the image quality of the panoramic optical lens. At the same time, the cemented lens is beneficial to reducing the assembly sensitivity of the panoramic optical lens and improving the production yield. The panoramic optical lens of the present invention has a maximum field of view of more than 200°, and has the characteristics of high image quality, large field of view, large aperture, small size, low cost, and obvious ghost elimination effect of the imaging picture. It can meet the use requirements at a temperature of -40°C to 95°C, and its imaging picture ghost elimination is obvious, which is conducive to the reliability of automatic driving picture collection. In addition, the panoramic optical lens provided by the present invention is used in conjunction with a photosensitive chip, so that its resolution and resolution are greatly improved.

[0096] In this embodiment, as a 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, the sixth lens L6 and the seventh lens L7 of the panoramic optical lens are designed as follows:

[0097] The first lens L1 has negative refractive power, an object-side surface S1 of the first lens L1 is convex, and an image-side surface S2 of the first lens L1 is concave;

[0098] The second lens L2 has negative refractive power, an object-side surface S3 of the second lens L2 has a convex structure, and an image-side surface S4 of the second lens L2 has a concave structure;

[0099] The third lens L3 has positive refractive power, the object-side surface S5 of the third lens L3 is convex or concave, and the image-side surface S6 of the third lens L3 is convex;

[0100] The fourth lens L4 has positive refractive power, and the object-side surface S8 and the image-side surface S9 of the fourth lens L4 are convex structures;

[0101] The fifth lens L5 has negative refractive power, and the object-side surface S9 and the image-side surface S10 of the fifth lens L5 are concave structures;

[0102] The sixth lens L6 has positive refractive power, and the object-side surface S11 and the image-side surface S12 of the sixth lens L6 are convex structures;

[0103] The seventh lens L7 has negative refractive power. The object-side surface S12 of the seventh lens L7 has a concave structure, and the image-side surface S13 of the seventh lens L7 has a convex structure.

[0104] In addition, an aperture S7 is provided between the third lens L3 and the fourth lens L4, and a filter L8 is provided on the side where the image side surface S13 of the seventh lens L7 is located. The filter L8 has an object side surface S14 and an image side surface S15. After passing through the filter L8, the light is finally imaged on the imaging surface of the panoramic optical lens.

[0105] Among them, the fourth lens L4 and the fifth lens L5 are combined into a cemented lens, and the sixth lens L6 and the seventh lens L7 are combined into a cemented lens, which is beneficial to correcting the chromatic aberration of the panoramic optical lens, achieving a large aperture, and improving the image quality of the panoramic optical lens. At the same time, the cemented lens is beneficial to reducing the assembly sensitivity of the panoramic optical lens and improving the production yield.

[0106] In addition, as a preferred embodiment, the first lens L1 and the third lens L3 of the panoramic optical lens are glass spherical lenses; the second lens L2, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are plastic aspherical lenses.

[0107] The panoramic optical lens adopts five plastic aspherical lenses, which can effectively correct the spherical aberration, coma, field curvature and other aberrations of the panoramic optical lens, and at the same time help to reduce costs; in addition, it is matched with two glass spherical lenses, which is beneficial to correct the temperature drift of the panoramic optical lens. The use of this panoramic optical lens structure is conducive to achieving high image quality, low cost and achieving the effect of athermalization of the lens.

[0108] In this embodiment, the focal lengths of 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 seventh lens L7 of the panoramic optical lens are designed to satisfy the following conditional formula:

[0109] -5.0≤f1 / f≤-4.5;

[0110] -2.8≤f2 / f≤-1.9;

[0111] 1.8≤f3 / f≤3.3;

[0112] 1.0≤|f4 / f|≤1.9;

[0113] 0.3≤|f5 / f|≤1.6;

[0114] 2.3≤f6 / f≤5.5;

[0115] 2.3≤f7 / f≤5.5;

[0116] Among them, f1 is the effective focal length of the first lens L1, f2 is the effective focal length of the first lens L2, f3 is the effective focal length of the first 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, f7 is the effective focal length of the seventh lens L7, 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, and the sixth lens L6 and the seventh lens L7 form a cemented lens.

[0117] In addition, the first lens L1 has a large negative focal length, which is beneficial for collecting light at a larger angle and reducing the size of the panoramic optical lens head, which is beneficial for realizing the miniaturization function of the panoramic optical lens. The second lens L2 has a negative focal length, which is beneficial for the light to enter the rear lens group more smoothly when combined with the first lens L1.

[0118] In this embodiment, by controlling the focal length and shape of 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 seventh lens L7, the lens has a field of view angle greater than 200° and a large aperture value less than or equal to 1.68; at the same time, it has an obvious effect on eliminating ghost images, making the imaging picture clearer and cleaner, eliminating some stray light from the design, and also has the characteristics of high image quality, small size, low cost, etc., which is conducive to the promotion of autonomous driving.

[0119] In the present 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 light with a larger field angle to the rear group system, which is beneficial to the improvement of the field angle, and can achieve a field angle greater than 200°; the shape design of the third lens L3, the fourth lens L4, and the fifth lens L5, by matching their lens focal lengths, is beneficial to correcting the aberration of the panoramic optical lens, improving the imaging quality, and achieving the characteristic of a large aperture value less than or equal to 1.68; and the fourth lens L4 and the fifth lens L5 are combined into a cemented lens, and the sixth lens L6 and the seventh lens L7 form a cemented lens. The two groups of cemented lenses are convenient for reducing the tolerance sensitivity of the panoramic optical lens, which is beneficial to improving the processing and assembly yield.

[0120] In some optional 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, the sixth lens L6 and the seventh lens L6 of the panoramic optical lens are also designed to satisfy the following conditional formula:

[0121] 1.80≤Nd1≤1.92;

[0122] 1.51≤Nd2≤1.54;

[0123] 1.93≤Nd3≤2.01;

[0124] 1.51≤Nd4≤1.54;

[0125] 1.61≤Nd5≤1.66;

[0126] 1.51≤Nd6≤1.54;

[0127] 1.61≤Nd7≤1.66;

[0128] Among them, Nd1 is the refractive index of the first lens L1, Nd2 is the refractive index of the second lens L2, 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, Nd6 is the refractive index of the sixth lens L6, and Nd7 is the refractive index of the seventh lens L7.

[0129] In the above parameter design, the structural design of the first lens L1 and the second lens L1, by matching the lens refractive index, is conducive to reducing the head size of the panoramic optical lens to achieve the purpose of miniaturization; the refractive index selection of the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and / or the seventh lens L7 is conducive to correcting the spherical aberration of the panoramic optical lens to make the imaging picture clearer.

[0130] In some optional 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, the sixth lens L6 and the seventh lens L7 of the panoramic optical lens are also designed to satisfy the following conditional formula:

[0131] 34≤Vd1≤48;

[0132] 23≤Vd2≤57;

[0133] 17.5≤Vd3≤25.5;

[0134] 52≤Vd4≤57;

[0135] 21≤Vd5≤25;

[0136] 52≤Vd6≤57;

[0137] 21≤Vd7≤25;

[0138] Among them, 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, Vd6 is the dispersion coefficient of the sixth lens L6, and Vd7 is the dispersion coefficient of the seventh lens L7.

[0139] In the above parameter design, the structural design of the third lens L3, the fourth lens L4, and the fifth lens L5 is beneficial to correcting the chromatic aberration of the panoramic optical lens and making the imaging picture clearer by matching the lens dispersion coefficient.

[0140] In some optional embodiments, the following parameters of the panoramic optical lens are also designed:

[0141] Make the BFL and f of the panoramic optical lens satisfy the following conditional formula:

[0142] 1.66≤BFL / f≤1.8;

[0143] Make the BFL and TTL of the panoramic optical lens meet the following conditions:

[0144] 0.13≤BFL / TTL≤0.15;

[0145] Wherein, BFL is the back focal length of the panoramic optical lens; TTL is the distance from the center of the object side surface of the first lens L1 to the imaging surface of the panoramic optical lens on the optical axis.

[0146] The embodiment of the present invention provides a large-field-of-view and large-aperture vehicle-mounted panoramic optical lens, which can significantly eliminate ghost images in the imaging picture, and is conducive to the reliability of automatic driving picture acquisition. The panoramic optical lens is composed of two glass spherical lenses and five plastic aspherical lenses, has good processability, low cost, a field of view angle of >200°, an aperture value of ≤1.68, and a small size, which is conducive to module miniaturization.

[0147] In this embodiment, based on the above-mentioned design of the shape of the panoramic optical lens and related parameters, the parameters of the panoramic optical lens are designed as follows:

[0148] Table 1: The focal length design of the panoramic optical lens protected in Example 1 is as follows:

[0149] Example 1 Lower limit Upper limit f1 / f -5.15 -5.15 -4.39 f2 / f -2.86 -2.86 -2.74 f3 / f 5.45 2.74 5.45 |f4 / f| 2.42 1.41 2.42 |f5 / f| 2.31 1.7 2.31 F6 / f 2.03 1.73 2.03 F7 / f -8.71 -8.71 -3.18

[0150] Among them, the first lens L1 has a large negative focal length, which is beneficial to collecting light at a larger angle, and is more beneficial to reducing the size of the panoramic optical lens head, which is beneficial to realizing the miniaturization function of the panoramic optical lens. The second lens L2 has a negative focal length, which is beneficial to the light entering the rear lens group more smoothly in cooperation with the first lens L1. The third lens L3 has a positive focal length, which is beneficial to converge the light collected by the first lens L1 and the second lens L2 to the rear lens group. The fourth lens L4 has a positive focal length, and the fifth lens L5 has a negative focal length. The fourth lens L4 and the fifth lens L5 are set as a cemented lens, which is beneficial to correct aberrations and realize the characteristics of a large aperture value less than or equal to 1.68. Finally, the sixth lens L6 with a positive focal length and the third lens L7 with a negative focal length set as a cemented lens are beneficial to correct the chromatic aberration of the panoramic optical lens and improve the image quality of the panoramic optical lens. At the same time, the cemented lens is beneficial to reduce the assembly sensitivity of the panoramic optical lens and improve the production yield.

[0151] Table 2: A design value of the panoramic optical lens protected by Example 1:

[0152]

[0153] In the above Table 2, the surface numbers are numbered according to the order of the surfaces of each lens, where "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 curvature of the lens surface, a positive value represents that the surface is bent toward the image side, and a negative value represents that the surface is bent toward the object side, where "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 light deflection ability of the material between the current surface and the next surface, and a blank space represents that the current position is air and the refractive index is 1; the Abbe number represents the dispersion characteristics of the material between the current surface and the next surface to the light, and a blank space represents that the current position is air; the k value represents the numerical value of the best fitting cone coefficient of the aspheric surface.

[0154] The aspheric cone 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 vector height of the aspheric surface in the Z direction; r is the height of the aspheric surface; c is the curvature of the fitted sphere, which is the inverse of the radius of curvature; k is the fitting cone coefficient; AG is the coefficient of the 4th, 6th, 8th, 10th, 12th, 14th, and 16th order terms of the aspheric polynomial.

[0157] Table 3: A design value of the aspheric coefficient in the panoramic optical lens protected by Example 1:

[0158]

[0159] Table 4: Other optical information of the panoramic optical lens protected by Example 1:

[0160] TTL 17.65 FOV 200 D 14 f 1.4 BFL 2.49 h 5.5 (FOV×f) / h 50.91 BFL / f 1.78 BFL / TTL 0.14 FNO 1.68

[0161] D in Table 4 is the optical effective aperture of the first lens L1.

[0162] In this embodiment, based on the shape design of the panoramic optical lens, combined with the above parameter design, Figure 2 It can be seen from the simulation diagram of field curvature and distortion of the panoramic optical lens shown in FIG. Figure 2 In the left coordinate system, the horizontal coordinate represents the field curvature of the large field of view panoramic optical lens, in mm; the vertical coordinate represents the normalized image height, 0 represents the optical axis; in the right coordinate system, the horizontal coordinate represents the distortion (F-θ), in %, and the vertical coordinate represents the normalized image height. Figure 2 It can be seen that the field curvature of different wavelengths is within ±0.1mm, indicating that the field curvature of the wide-field 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 wide-field panoramic optical lens at each wavelength is well controlled, and a good linear relationship is obtained between the image height and the field of view angle.

[0163] Combination Figure 3 It can be seen from the vertical axis aberration simulation schematic diagram of the panoramic optical lens shown in FIG. Figure 3 In the figure, the vertical direction represents the normalization of the aperture, 0 represents the optical axis, and the vertical vertex represents the maximum pupil radius; the horizontal direction represents the offset relative to the ideal focus, in millimeters (mm). The different linear curves in the figure represent different wavelengths of panoramic optical lens imaging, which are represented by Figure 3 It can be seen that the vertical axis aberration of different wavelengths is controlled within the range of ±0.1mm, indicating that the spherical aberration of the panoramic optical lens at each wavelength is well controlled.

[0164] Combination Figure 4 From the MTF curve diagram of the panoramic optical lens shown in Figure 4 In the , MTF can represent the comprehensive imaging quality of the panoramic optical lens. The higher the MTF value, the clearer the image. Figure 4 As shown in the figure, the horizontal coordinate represents the spatial frequency, the unit is lp / mm; the vertical coordinate represents the normalized MTF (OTF coefficient), without unit; T represents meridian, S represents arc loss; different lines represent different fields of view. Figure 4 It can be seen that the panoramic optical lens has good imaging quality within the field of view.

[0165] Example 2

[0166] This embodiment discloses a large-field-of-view and large-aperture vehicle-mounted panoramic optical lens, which is based on the shape design of the lens of the panoramic optical lens of Embodiment 1, and optimizes the shapes of the fourth lens L4 and the fifth lens L5.

[0167] In this embodiment, if Figure 5 As 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, the sixth lens L6 and the seventh lens L7 of the panoramic optical lens are designed as follows:

[0168] The first lens L1 has negative refractive power, an object-side surface S1 of the first lens L1 is convex, and an image-side surface S2 of the first lens L1 is concave;

[0169] The second lens L2 has negative refractive power, an object-side surface S3 of the second lens L2 has a convex structure, and an image-side surface S4 of the second lens L2 has a concave structure;

[0170] The third lens L3 has positive refractive power, the object-side surface S5 of the third lens L3 is convex or concave, and the image-side surface S6 of the third lens L3 is convex;

[0171] The fourth lens L4 has negative refractive power, and the object-side surface S8 and the image-side surface S9 of the fourth lens L4 are concave structures;

[0172] The fifth lens L5 has positive refractive power, and the object-side surface S9 and the image-side surface S10 of the fifth lens L5 are convex structures;

[0173] The sixth lens L6 has positive refractive power, and the object-side surface S11 and the image-side surface S12 of the sixth lens L6 are convex structures;

[0174] The seventh lens L7 has negative refractive power. The object-side surface S12 of the seventh lens L7 has a concave structure, and the image-side surface S13 of the seventh lens L7 has a convex structure.

[0175] In addition, an aperture S7 is provided between the third lens L3 and the fourth lens L4, and a filter L8 is provided on the side where the image side surface S13 of the seventh lens L7 is located. The filter L8 has an object side surface S14 and an image side surface S15. After passing through the filter L8, the light is finally imaged on the imaging surface of the panoramic optical lens.

[0176] Among them, the fourth lens L4 and the fifth lens L5 are combined into a cemented lens, and the sixth lens L6 and the seventh lens L7 are combined into a cemented lens, which is beneficial to correcting the chromatic aberration of the panoramic optical lens, achieving a large aperture, and improving the image quality of the panoramic optical lens. At the same time, the cemented lens is beneficial to reducing the assembly sensitivity of the panoramic optical lens and improving the production yield.

[0177] In addition, as a preferred embodiment, the first lens L1 and the third lens L3 of the panoramic optical lens are glass spherical lenses; the second lens L2, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are plastic aspherical lenses.

[0178] The panoramic optical lens adopts five plastic aspherical lenses, which can effectively correct the spherical aberration, coma, field curvature and other aberrations of the panoramic optical lens, and at the same time help to reduce costs; in addition, it is matched with two glass spherical lenses, which is beneficial to correct the temperature drift of the panoramic optical lens. The use of this panoramic optical lens structure is conducive to achieving high image quality, low cost and achieving the effect of athermalization of the lens.

[0179] In this embodiment, based on the above-mentioned shape design of the panoramic optical lens, the relevant parameters of the panoramic optical lens are designed as follows:

[0180] Table 5: The focal length design of the panoramic optical lens protected by Example 2 is as follows:

[0181] Example 2 Lower limit Upper limit f1 / f -4.39 -5.15 -4.39 f2 / f -2.79 -2.86 -2.74 f3 / f 2.74 2.74 5.45 |f4 / f| 1.41 1.41 2.42 |f5 / f| 1.70 1.7 2.31 F6 / f 1.78 1.73 2.03 F7 / f -3.30 -8.71 -3.18

[0182] Table 6: A design value of the panoramic optical lens protected by Example 2:

[0183]

[0184]

[0185] In the above Table 6, the surface numbers are numbered according to the order of the surfaces of each lens, where "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 curvature of the lens surface, a positive value represents that the surface is bent toward the image side, and a negative value represents that the surface is bent toward the object side, where "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 light deflection ability of the material between the current surface and the next surface, and the blank represents that the current position is air and the refractive index is 1; the Abbe number represents the dispersion characteristics of the material between the current surface and the next surface to the light, and the blank represents that the current position is air; the k value represents the numerical value of the best fitting cone coefficient of the aspheric surface.

[0186] The aspheric cone coefficient can be defined by the following aspheric formula, but is not limited to the following representation:

[0187]

[0188] Among them, z is the axial vector height of the aspheric surface in the Z direction; r is the height of the aspheric surface; c is the curvature of the fitted sphere, which is the inverse of the radius of curvature; k is the fitting cone coefficient; AG is the coefficient of the 4th, 6th, 8th, 10th, 12th, 14th, and 16th order terms of the aspheric polynomial.

[0189] Table 7: A design value of the aspheric coefficient in the panoramic optical lens protected by Example 2:

[0190]

[0191]

[0192] Table 8: Other optical information of the panoramic optical lens protected by Example 2:

[0193] TTL 17.72 FOV 200 D 13.9 F 1.48 BFL 2.47 h 5.5 (FOV×f) / h 53.82 BFL / f 1.67 BFL / TTL 0.14 FNO 1.64

[0194] D in Table 8 is the optical effective aperture of the first lens L1.

[0195] In this embodiment, based on the shape design of the panoramic optical lens, combined with the above parameter design, Figure 6 It can be seen from the simulation diagram of field curvature and distortion of the panoramic optical lens shown in FIG. Figure 6 In the left coordinate system, the horizontal coordinate represents the field curvature of the large field of view panoramic optical lens, in mm; the vertical coordinate represents the normalized image height, 0 represents the optical axis; in the right coordinate system, the horizontal coordinate represents the distortion (F-θ), in %, and the vertical coordinate represents the normalized image height. Figure 6 It can be seen that the field curvature of different wavelengths is within ±0.1mm, indicating that the field curvature of the wide-field 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 wide-field panoramic optical lens at each wavelength is well controlled, and a good linear relationship is obtained between the image height and the field of view angle.

[0196] Combination Figure 7 It can be seen from the vertical axis aberration simulation schematic diagram of the panoramic optical lens shown in FIG. Figure 7 In the figure, the vertical direction represents the normalization of the aperture, 0 represents the optical axis, and the vertical vertex represents the maximum pupil radius; the horizontal direction represents the offset relative to the ideal focus, in millimeters (mm). The different linear curves in the figure represent different wavelengths of panoramic optical lens imaging, which are represented by Figure 7 It can be seen that the vertical axis aberration of different wavelengths is controlled within the range of ±0.1mm, indicating that the spherical aberration of the panoramic optical lens at each wavelength is well controlled.

[0197] Combination Figure 8 From the MTF curve diagram of the panoramic optical lens shown in Figure 8In the , MTF can represent the comprehensive imaging quality of the panoramic optical lens. The higher the MTF value, the clearer the image. Figure 8 As shown in the figure, the horizontal coordinate represents the spatial frequency, the unit is lp / mm; the vertical coordinate represents the normalized MTF (OTF coefficient), without unit; T represents meridian, S represents arc loss; different lines represent different fields of view. Figure 8 It can be seen that the panoramic optical lens has good imaging quality within the field of view.

[0198] Example 3

[0199] This embodiment discloses a panoramic optical lens. Based on the shape design of the lens of the panoramic optical lens of Embodiment 2, the relevant parameters of the panoramic optical lens are optimized. The parameters of the panoramic optical lens are designed as follows:

[0200] Table 9: The focal length design of the panoramic optical lens protected by Example 3 is as follows:

[0201] Example 3 Lower limit Upper limit f1 / f -4.49 -5.15 -4.39 f2 / f -2.74 -2.86 -2.74 f3 / f 2.77 2.74 5.45 |f4 / f| 1.47 1.41 2.42 |f5 / f| 1.77 1.7 2.31 F6 / f 1.73 1.73 2.03 F7 / f -3.18 -8.71 -3.18

[0202] Table 10: A design value of the panoramic optical lens protected by Example 3:

[0203]

[0204]

[0205] In the above Table 10, the surface numbers are numbered according to the order of the surfaces of each lens, where "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 curvature of the lens surface, a positive value represents that the surface is bent toward the image side, and a negative value represents that the surface is bent toward the object side, where "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 light deflection ability of the material between the current surface and the next surface, and the blank represents that the current position is air and the refractive index is 1; the Abbe number represents the dispersion characteristics of the material between the current surface and the next surface to the light, and the blank represents that the current position is air; the k value represents the numerical value of the best fitting cone coefficient of the aspheric surface.

[0206] The aspheric cone coefficient can be defined by the following aspheric formula, but is not limited to the following representation:

[0207]

[0208] Among them, z is the axial vector height of the aspheric surface in the Z direction; r is the height of the aspheric surface; c is the curvature of the fitted sphere, which is the inverse of the radius of curvature; k is the fitting cone coefficient; AG is the coefficient of the 4th, 6th, 8th, 10th, 12th, 14th, and 16th order terms of the aspheric polynomial.

[0209] Table 11: A design value of the aspheric coefficient in the panoramic optical lens protected by Example 3:

[0210]

[0211] Table 12: Other optical information of the panoramic optical lens protected in Example 3:

[0212]

[0213]

[0214] D in Table 12 is the optical effective aperture of the first lens L1.

[0215] In this embodiment, based on the shape design of the panoramic optical lens, combined with the above parameter design, Fig.10 It can be seen from the simulation diagram of field curvature and distortion of the panoramic optical lens shown in FIG. Fig.10 In the left coordinate system, the horizontal coordinate represents the field curvature of the large field of view panoramic optical lens, in mm; the vertical coordinate represents the normalized image height, 0 represents the optical axis; in the right coordinate system, the horizontal coordinate represents the distortion (F-θ), in %, and the vertical coordinate represents the normalized image height. Fig.10 It can be seen that the field curvature of different wavelengths is within ±0.1mm, indicating that the field curvature of the wide-field 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 wide-field panoramic optical lens at each wavelength is well controlled, and a good linear relationship is obtained between the image height and the field of view angle.

[0216] Combination Fig.11 It can be seen from the vertical axis aberration simulation schematic diagram of the panoramic optical lens shown in FIG. Fig.11 In the figure, the vertical direction represents the normalization of the aperture, 0 represents the optical axis, and the vertical vertex represents the maximum pupil radius; the horizontal direction represents the offset relative to the ideal focus, in millimeters (mm). The different linear curves in the figure represent different wavelengths of panoramic optical lens imaging, which are represented by Fig.11 It can be seen that the vertical axis aberration of different wavelengths is controlled within the range of ±0.1mm, indicating that the spherical aberration of the panoramic optical lens at each wavelength is well controlled.

[0217] Combination Fig.12 From the MTF curve diagram of the panoramic optical lens shown in Fig.12 In the , MTF can represent the comprehensive imaging quality of the panoramic optical lens. The higher the MTF value, the clearer the image. Fig.12 As shown in the figure, the horizontal coordinate represents the spatial frequency, the unit is lp / mm; the vertical coordinate represents the normalized MTF (OTF coefficient), without unit; T represents meridian, S represents arc loss; different lines represent different fields of view. Fig.12 It can be seen that the panoramic optical lens has good imaging quality within the field of view.

[0218] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0219] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0220] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0221] Although the present invention is described in conjunction with the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications and changes according to the above content. Therefore, all such substitutions, improvements and changes are included in the spirit and scope of the appended claims.

Claims

1. A large-field-of-view and large-aperture vehicle-mounted panoramic optical lens, characterized in that: include: A first lens with negative power, a second lens with negative power, a third lens with positive power, a fourth lens with positive power or negative power, a fifth lens with positive power or negative power, a sixth lens with positive power, and a seventh lens with negative power, arranged in sequence from the object side to the image side along the optical axis; Wherein, the fourth lens and the fifth lens form a cemented lens; the sixth lens and the seventh lens form a cemented lens; The aperture value of the panoramic optical lens satisfies: FNO≤1.

68.

2. The large-viewing-field and large-aperture vehicle-mounted panoramic optical lens according to claim 1, characterized in that: The FOV, f and h of the panoramic optical lens satisfy the following conditional formula: 50≤(FOV×f) / h≤54; Among them, FOV is the maximum field of view of the optical lens, h is the image height corresponding to the maximum field of view, and f is the effective focal length of the panoramic optical lens.

3. The large-viewing-field and large-aperture vehicle-mounted panoramic optical lens according to claim 1, characterized in that: The object side surface of the first lens is a convex structure, and the image side surface of the first lens is a concave structure; The object side surface of the second lens is a convex structure, and the image side surface of the second lens is a concave structure; The object side surface of the third lens is convex or concave, and the image side surface of the third lens is convex; The fourth lens has positive refractive power, and the object side surface and the image side surface of the fourth lens are convex structures; The fifth lens has 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; The object side surface of the seventh lens is a concave structure, and the image side surface of the seventh lens is a convex structure.

4. The large-viewing-field and large-aperture vehicle-mounted panoramic optical lens according to claim 1, characterized in that: The object side surface of the first lens is a convex structure, and the image side surface of the first lens is a concave structure; The object side surface of the second lens is a convex structure, and the image side surface of the second lens is a concave structure; The object side surface of the third lens is convex or concave, and the image side surface of the third lens is convex; The fourth lens has 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 negative positive focal 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; The object side surface of the seventh lens is a concave structure, and the image side surface of the seventh lens is a convex structure.

5. The large-viewing-field and large-aperture vehicle-mounted panoramic optical lens according to claim 3 or 4, characterized in that: The first lens and the third lens are glass spherical lenses, and the second lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are plastic aspherical lenses.

6. The large-viewing-field and large-aperture vehicle-mounted panoramic optical lens according to claim 1, characterized in that: The panoramic optical lens satisfies the following conditional formula: -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; 2.3≤f7 / f≤5.5; Among them, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, f7 is the effective focal length of the seventh lens, and f is the effective focal length of the panoramic optical lens.

7. The large-viewing-field and large-aperture vehicle-mounted panoramic optical lens according to claim 1, characterized in that: The panoramic optical lens satisfies the following conditional formula: 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; 1.61≤Nd7≤1.66; Among them, 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, Nd6 is the refractive index of the sixth lens, and Nd7 is the refractive index of the seventh lens.

8. The large-viewing-field and large-aperture vehicle-mounted panoramic optical lens according to claim 1, characterized in that: The panoramic optical lens satisfies the following conditional formula: 34≤Vd1≤48; 23≤Vd2≤57; 17.5≤Vd3≤25.5; 52≤Vd4≤57; 21≤Vd5≤25; 52≤Vd6≤57; 21≤Vd7≤25; Among them, 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, Vd6 is the dispersion coefficient of the sixth lens, and Vd7 is the dispersion coefficient of the seventh lens.

9. The large-viewing-field and large-aperture vehicle-mounted panoramic optical lens according to claim 1, characterized in that: The BFL and f of the panoramic optical lens satisfy the following conditional formula: 1.66≤BFL / f≤1.8; Wherein, BFL is the back focal length of the panoramic optical lens, and f is the effective focal length of the panoramic optical lens.

10. The large-viewing-field and large-aperture vehicle-mounted panoramic optical lens according to claim 1, characterized in that: The BFL and TTL of the panoramic optical lens satisfy the following conditional formula: 0.13≤BFL / TTL≤0.15; Wherein, BFL is the back focal length of the panoramic optical lens; 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.

Images