Surround view optical lens and imaging equipment

Abstract

The present invention discloses a surround optical lens and an imaging device, wherein the surround optical lens comprises a first meniscus negative lens, a second meniscus negative lens, a third lens, a fourth lens, a fifth biconvex positive lens, a sixth biconcave negative lens and a seventh biconvex positive lens, which are sequentially arranged along the incident direction from left to right along the optical axis, wherein the first meniscus negative lens and the second meniscus negative lens have negative optical power, the fifth biconvex positive lens and the seventh biconvex positive lens have positive optical power, and the sixth biconcave negative lens has negative optical power. The present invention realizes miniaturization of the lens by reasonably configuring the surface shape, optical power, focal length, etc. of the first meniscus negative lens, the second meniscus negative lens, the third lens, the fourth lens, the fifth biconvex positive lens, the sixth biconcave negative lens and the seventh biconvex positive lens, which is conducive to reducing assembly sensitivity, controlling the high and low temperature back focus drift of the lens within a very small range, meeting the requirements of clear imaging, and is suitable for the fields of 360 surround view and APA automatic parking assistance.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical imaging, and in particular relates to a surround-view optical lens and an imaging device. Background Art

[0002] In recent years, the automotive field has developed rapidly, and with it the rapid development of automotive cameras and related autonomous driving assistance industries, the number and types of on-board lenses in cars have increased, and the requirements have become higher and higher.

[0003] The on-board surround view camera mainly assists the vehicle to pass through obstacles, and is a very important component of the car's automatic driving assistance. However, in the past, the on-board surround view camera was basically VGA and megapixel in resolution, and the vertical field of view was relatively small, which could not meet the current demand for higher resolution and larger vertical field of view for automatic driving assistance. Therefore, it is urgent to develop a 1080p or higher surround view camera with a larger vertical field of view to match it. Summary of the invention

[0004] In order to solve the technical problems existing in the prior art, the purpose of the present invention is to provide a surround-view optical lens and an imaging device.

[0005] In order to achieve the above purpose and the above technical effect, the technical solution adopted by the present invention is:

[0006] The present invention discloses a cycloidal optical lens, comprising a first meniscus negative lens, a second meniscus negative lens, a third lens, a fourth lens, an aperture ST, a fifth biconvex positive lens, a sixth biconcave negative lens and a seventh biconvex positive lens, which are arranged in sequence along the incident direction from left to right along the optical axis. The first meniscus negative lens has negative optical power, and its object side surface is convex, and its image side surface is concave. The second meniscus negative lens has negative optical power, and its object side surface is convex, and its image side surface is concave. The fifth biconvex positive lens has positive optical power, and its object side surface is convex, and its image side surface is convex. The sixth biconcave negative lens has negative optical power, and its object side surface is concave, and its image side surface is concave. The seventh biconvex positive lens has positive optical power, and its object side surface is convex, and its image side surface is convex.

[0007] The surround optical lens meets the following conditions:

[0008] -7≤f1 / f≤-6, -2≤f2 / f≤-3, 1.5≤f5 / f≤3, 2≤f7 / f≤3

[0009] Among them, f1, f2, f5, f7, and f are respectively the focal lengths of the first meniscus negative lens, the second meniscus negative lens, the fifth biconvex positive lens, the seventh biconvex positive lens, and the entire lens group.

[0010] Furthermore, the maximum field of view angle FOV of the surround optical lens, the focal length value f of the surround optical lens, and the image height h corresponding to the maximum field of view angle of the surround optical lens satisfy the following relationship:

[0011] 85≤(FOV×f) / h≤100.

[0012] Furthermore, the surround optical lens satisfies the conditional formula:

[0013] D / f≤14

[0014] Wherein, D is the maximum aperture of the object side of the first meniscus negative lens corresponding to the maximum field of view of the surround optical lens, and f is the focal length value of the whole set of the surround optical lens.

[0015] Furthermore, the surround optical lens satisfies the conditional formula:

[0016] TTL / f≤17

[0017] Wherein, TTL is the distance from the center of the object side surface of the first meniscus negative lens to the imaging surface of the surround optical lens on the optical axis, and f is the focal length value of the surround optical lens.

[0018] Furthermore, the refractive index of the first meniscus negative lens Nd1>1.8, and the Abbe number Vd1>40; the refractive index of the second meniscus negative lens Nd2>1.5, and the Abbe number Vd2>55; the refractive index of the fifth biconvex positive lens Nd5>1.5, and the Abbe number Vd5>55; the refractive index of the sixth biconcave negative lens Nd6>1.6, and the Abbe number Vd6<25; the refractive index of the seventh biconvex positive lens Nd7>1.5, and the Abbe number Vd7>55.

[0019] Furthermore, when the third lens is a plastic lens, the refractive index Nd3>1.5, and the Abbe number Vd3>55; when the third lens is a glass lens, the refractive index Nd3>1.75, and the Abbe number Vd3<30.

[0020] Furthermore, the third lens has positive or negative optical power, and its object side is convex or concave, and its image side is convex or concave.

[0021] Furthermore, when the fourth lens is a plastic lens, the refractive index Nd4>1.5, and the Abbe number Vd4>55; when the fourth lens is a glass lens, the refractive index Nd4>1.75, and the Abbe number Vd4<30.

[0022] Furthermore, the fourth lens has positive refractive power, its object side is convex or concave, and its image side is convex.

[0023] The present invention also discloses an imaging device, comprising the above-mentioned surround optical lens and an imaging element, wherein the imaging element is used to convert the optical image formed by the surround optical lens into an electrical signal.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The invention discloses a cycloidal optical lens and an imaging device. The cycloidal optical lens comprises a first meniscus negative lens, a second meniscus negative lens, a third lens, a fourth lens, an aperture ST, a fifth biconvex positive lens, a sixth biconcave negative lens and a seventh biconvex positive lens which are sequentially arranged along an optical axis in an incident direction from left to right. A protective glass CG and an image plane IMA are also arranged on the right side of the seventh biconvex positive lens. The first meniscus negative lens has negative optical power, and its object side surface is convex, and its image side surface is concave. The second meniscus negative lens has negative optical power, and its object side surface is convex, and its image side surface is concave. The fourth lens has positive optical power, and its object side surface is convex or concave, and its image side surface is convex. The fifth biconvex positive lens has positive optical power, and its object side surface is convex, and its image side surface is convex. The sixth biconcave negative lens has negative optical power, and its object side surface is concave, and its image side surface is concave. The seventh biconvex positive lens has positive optical power, and its object side surface is convex, and its image side surface is convex. The present invention realizes lens miniaturization by reasonably configuring the surface shape, optical focal length, focal length, distance, curvature radius, material, etc. of seven lenses, namely a first meniscus negative lens, a second meniscus negative lens, a third lens, a fourth lens, a fifth biconvex positive lens, a sixth biconcave negative lens and a seventh biconvex positive lens. This is beneficial to reducing assembly sensitivity and controlling the high and low temperature back focus drift of the lens within a very small range to meet clear imaging requirements, overcoming the problems of low resolution, small vertical field of view and difficulty in miniaturization in the prior art, and is suitable for the fields of 360-degree surround view and APA automatic parking assistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0027] Figure 2 is the field curvature distortion curve of the lens in Example 1 of the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0029] Figure 4 is a field curvature distortion curve of the lens of Example 2 of the present invention;

[0030] Figure 5 This is a schematic diagram of the structure of Embodiment 3 of the present invention.

[0031] Figure 6 : is the field curvature distortion curve of the lens of Example 3 of the present invention. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0033] A brief overview of one or more aspects is given below to provide a basic understanding of these aspects. This overview is not an exhaustive overview of all conceived aspects, and is neither intended to identify the key or decisive elements of all aspects nor to attempt to define the scope of any or all aspects. Its only purpose is to give some concepts of one or more aspects in a simplified form as a prelude to a more detailed description to be given later. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0034] like Figure 1-6 As shown, the cycloidal optical lens includes a first meniscus negative lens 1, a second meniscus negative lens 2, a third lens 3, a fourth lens 4, a fifth biconvex positive lens 5, a sixth biconcave negative lens 6, a seventh biconvex positive lens 7, a protective glass CG 9, and an image plane IMA 10, which are arranged in sequence along the incident direction from left to right along the optical axis. An aperture ST 11 is arranged between the fourth lens 4 and the fifth biconvex positive lens 5, and a filter IR 8 is selectively arranged between the seventh biconvex positive lens 7 and the protective glass CG 9. The first meniscus negative lens 1 has negative optical power, its object side surface is convex, and the image side surface is concave; the second meniscus negative lens 2 has negative optical power, its object side surface is convex, and the image side surface is concave; the fourth lens 4 has positive optical power, its object side surface is convex or concave, and the image side surface is convex; the fifth double convex positive lens 5 has positive optical power, its object side surface is convex, and the image side surface is convex; the sixth double concave negative lens 6 has negative optical power, its object side surface is concave, and the image side surface is concave; the seventh double convex positive lens 7 has positive optical power, its object side surface is convex, and the image side surface is convex.

[0035] The maximum field of view angle FOV of the surround optical lens, the focal length value f of the surround optical lens, and the image height h corresponding to the maximum field of view angle of the surround optical lens satisfy the following conditions:

[0036] 85≤(FOV×f) / h≤100. Controlling these three indicators is beneficial to increasing the vertical field of view.

[0037] The surround optical lens meets the following conditions:

[0038] D / f≤14

[0039] TTL / f≤17, which is conducive to miniaturization of the lens

[0040] Wherein, D is the maximum aperture of the object side of the first meniscus negative lens 1 corresponding to the maximum field of view of the cycloidal optical lens, and TTL is the distance from the center of the object side of the first meniscus negative lens 1 to the imaging surface of the cycloidal optical lens on the optical axis.

[0041] The surround optical lens meets the following conditions:

[0042] -7≤f1 / f≤-6, -2≤f2 / f≤-3, 1.5≤f5 / f≤3, 2≤f7 / f≤3

[0043] Among them, f1, f2, f5, f7, and f are respectively the focal lengths of the first meniscus negative lens 1, the second meniscus negative lens 2, the fifth double convex positive lens 5, the seventh double convex positive lens 7, and the entire lens group. By reasonably matching the focal lengths of plastic and glass lenses, it is beneficial to reduce the assembly sensitivity and control the high and low temperature back focus drift of the lens within a very small range to meet the requirements of clear imaging.

[0044] In one or some embodiments, the first meniscus negative lens 1 and the fourth lens 4 may be glass spherical lenses, and the second meniscus negative lens 2, the third lens 3, the fifth biconvex positive lens 5, the sixth biconcave negative lens 6 and the seventh biconvex positive lens 7 may be plastic aspherical lenses.

[0045] In one or some embodiments, the third lens 3 may be a plastic lens or a glass spherical lens, and the fourth lens 4 may be a glass lens or a plastic aspherical lens.

[0046] In one or some embodiments, the third lens 3 may have positive or negative optical power, and its object side may be convex or concave, and its image side may be convex or concave. This lens is conducive to collecting light, reducing external field aberrations, and improving imaging quality.

[0047] In one or some embodiments, the refractive index Nd1 of the first meniscus negative lens 1 is greater than 1.8, and the Abbe number Vd1 is greater than 40; the refractive index Nd2 of the second meniscus negative lens 2 is greater than 1.5, and the Abbe number Vd2 is greater than 55; when the third lens 3 is a plastic lens, the refractive index Nd3 is greater than 1.5, and the Abbe number Vd3 is greater than 55; when the third lens 3 is a glass lens, the refractive index Nd3 is greater than 1.75, and the Abbe number Vd3 is less than 30; the fourth lens 4 is a plastic lens. When the lens is a double-convex lens, the refractive index Nd4 is greater than 1.5, and the Abbe number Vd4 is greater than 55. When the fourth lens 4 is a glass lens, the refractive index Nd4 is greater than 1.75, and the Abbe number Vd4 is less than 30. The fifth double-convex positive lens 5 has a refractive index Nd5>1.5, and the Abbe number Vd5>55. The sixth double-concave negative lens 6 has a refractive index Nd6>1.6, and the Abbe number Vd6<25. The seventh double-convex positive lens 7 has a refractive index Nd7>1.5, and the Abbe number Vd7>55.

[0048] Example 1

[0049] like Figure 1-2 As shown, the cycloidal optical lens includes a first meniscus negative lens 1, a second meniscus negative lens 2, a third lens 3, a fourth lens 4, an aperture ST 11, a fifth biconvex positive lens 5, a sixth biconcave negative lens 6, a seventh biconvex positive lens 7, a filter IR 8, a protective glass CG 9, and an image plane IMA 10, which are arranged in sequence along the optical axis from left to right in the incident direction. The first meniscus negative lens 1 has negative optical power, and its object side surface is convex, and its image side surface is concave; the second meniscus negative lens 2 has negative optical power, and its object side surface is convex, and its image side surface is concave; the third lens 3 has positive or negative optical power, and its object side surface is convex, and its image side surface is convex; the fourth lens 4 has positive optical power, and its object side surface is concave, and its image side surface is convex; the fifth double convex positive lens 5 has positive optical power, and its object side surface is convex, and its image side surface is convex; the sixth double concave negative lens 6 has negative optical power, and its object side surface is concave, and its image side surface is concave; the seventh double convex positive lens 7 has positive optical power, and its object side surface is convex, and its image side surface is convex.

[0050] The maximum field of view angle FOV of the surround optical lens, the focal length value f of the surround optical lens, and the image height h corresponding to the maximum field of view angle of the surround optical lens satisfy the following conditions:

[0051] 85≤(FOV×f) / h≤100. Controlling these three indicators is beneficial to increasing the vertical field of view.

[0052] The surround optical lens meets the following conditions:

[0053] D / f≤14

[0054] TTL / f≤17, which is conducive to miniaturization of the lens

[0055] Wherein, D is the maximum aperture of the object side of the first meniscus negative lens 1 corresponding to the maximum field of view of the cycloidal optical lens, and TTL is the distance from the center of the object side of the first meniscus negative lens 1 to the imaging surface of the cycloidal optical lens on the optical axis.

[0056] The surround optical lens meets the following conditions:

[0057] -7≤f1 / f≤-6, -2≤f2 / f≤-3, 1.5≤f5 / f≤3, 2≤f7 / f≤3

[0058] Among them, f1, f2, f5, f7, and f are respectively the focal lengths of the first meniscus negative lens 1, the second meniscus negative lens 2, the fifth double convex positive lens 5, the seventh double convex positive lens 7, and the entire lens group. By reasonably matching the focal lengths of plastic and glass lenses, it is beneficial to reduce the assembly sensitivity and control the high and low temperature back focus drift of the lens within a very small range to meet the requirements of clear imaging.

[0059] The first meniscus negative lens 1 is a glass spherical lens, the second meniscus negative lens 2 is a plastic aspherical lens, the third lens 3 is a glass spherical lens, the fourth lens 4 is a plastic aspherical lens, the fifth biconvex positive lens 5, the sixth biconcave negative lens 6 and the seventh biconvex positive lens 7 are all plastic aspherical lenses.

[0060] The refractive index of the first meniscus negative lens 1 is Nd1>1.8, and the Abbe number Vd1>40; the refractive index of the second meniscus negative lens 2 is Nd2>1.5, and the Abbe number Vd2>55; the refractive index of the third lens 3 is Nd3>1.75, and the Abbe number Vd3<30; the refractive index of the fourth lens 4 is Nd4>1.5, and the Abbe number Vd4>55; the refractive index of the fifth biconvex positive lens 5 is Nd5>1.5, and the Abbe number Vd5>55; the refractive index of the sixth biconcave negative lens 6 is Nd6>1.6, and the Abbe number Vd6<25; the refractive index of the seventh biconvex positive lens 7 is Nd7>1.5, and the Abbe number Vd7>55.

[0061] Table 1 shows the surface shape, curvature radius R, thickness and material of each lens of the panoramic optical lens of Example 1, wherein the units of the curvature radius R and thickness are both millimeters.

[0062] Table 1

[0063] Face type R-Value thickness Material S1 Spherical 12.54 1 1.80 46.6 S2 Spherical 3.43 2.088 S3 Aspheric 9.165 0.844 1.54 55.9 S4 Aspheric 1.06 1.473 S5 Spherical 8.01 1.544 1.92 20.88 S6 Spherical -8.01 0.593 S7 Aspheric -9.63 0.695 1.54 55.9 S8 Aspheric -3.976 0.106 S9 Aperture endless 0.138 S10 Aspheric 4.296 1.388 1.54 55.9 S11 Aspheric -1.246 0.557 1.64 23.5 S12 Aspheric 30.494 0.258 S13 Aspheric 4.147 1.539 1.54 55.9 S14 Aspheric -1.993 0.07 IR endless 0.3 1.52 64.2 IR endless 1.202 CG endless 0.4 1.52 64.2 CG endless 0.079

[0064] In Table 1, when the radius of curvature of the aperture ST 11, the filter IR 8 and the protective glass CG 9 is infinite, it means that the surface is a plane.

[0065] The surface equation of an aspheric surface is as follows:

[0066]

[0067] Among them, z is the distance vector height from the vertex of the aspherical surface when the aspherical surface is at a height of r along the optical axis; c is the curvature of the paraxial aspherical surface, c=1 / R, R is the radius of curvature, and c is the reciprocal of the radius of curvature; k is the cone coefficient; α1 is the second-order coefficient of the aspherical surface, α2 is the fourth-order coefficient of the aspherical surface, α3 is the sixth-order coefficient of the aspherical surface, α4 is the eighth-order coefficient of the aspherical surface, α5 is the tenth-order coefficient of the aspherical surface, α6 is the twelfth-order coefficient of the aspherical surface, α7 is the fourteenth-order coefficient of the aspherical surface, and α8 is the sixteenth-order coefficient of the aspherical surface.

[0068] Table 2 gives the cone coefficient k and the higher-order coefficients α2, α3, α4, α5, α6, α7, α8 of S3, S4, S7, S8, S10, S11, S12, S13, and S14.

[0069] Table 2

[0070] k α2 α3 α4 α5 α6 α7 α8 S3 -23.53 -2.74E-3 3.19E-5 0 0 0 0 0 S4 -0.958 9.54E-3 -7.05E-4 0 0 0 0 0 S7 0 5.12E-3 8.64E-3 0 0 0 0 0 S8 0 3.06E-2 7.45E-4 0 0 0 0 0 S10 0 4.04E-2 2.40E-3 0 0 0 0 0 S11 0 -5.08E-2 6.55E-3 0 0 0 0 0 S12 0 -3.81E-2 1.44E-2 0 0 0 0 0 S13 -19.17 -3.51E-2 -3.15E-3 0 0 0 0 0 S14 -0.467 1.575E-2 -3.66E-3 0 0 0 0 0

[0071] Example 2

[0072] like Figure 3-4 As shown, the cycloidal optical lens comprises a first meniscus negative lens 1, a second meniscus negative lens 2, a third lens 3, a fourth lens 4, an aperture ST 11, a fifth biconvex positive lens 5, a sixth biconcave negative lens 6, a seventh biconvex positive lens 7, a protective glass CG 9, and an image plane IMA 10, which are sequentially arranged along the incident direction from left to right along the optical axis. The first meniscus negative lens 1 has negative optical power, and its object side surface is convex, and its image side surface is concave; the second meniscus negative lens 2 has negative optical power, and its object side surface is convex, and its image side surface is concave; the fourth lens 4 has positive optical power, and its object side surface is convex, and its image side surface is convex; the fifth biconvex positive lens 5 has positive optical power, and its object side surface is convex, and its image side surface is convex; the sixth biconcave negative lens 6 has negative optical power, and its object side surface is concave, and its image side surface is concave; the seventh biconvex positive lens 7 has positive optical power, and its object side surface is convex, and its image side surface is convex.

[0073] The maximum field of view angle FOV of the surround optical lens, the focal length value f of the surround optical lens, and the image height h corresponding to the maximum field of view angle of the surround optical lens satisfy the following conditions:

[0074] 85≤(FOV×f) / h≤100. Controlling these three indicators is beneficial to increasing the vertical field of view.

[0075] The surround optical lens meets the following conditions:

[0076] D / f≤14

[0077] TTL / f≤17, which is conducive to miniaturization of the lens

[0078] Wherein, D is the maximum aperture of the object side of the first meniscus negative lens 1 corresponding to the maximum field of view of the cycloidal optical lens, and TTL is the distance from the center of the object side of the first meniscus negative lens 1 to the imaging surface of the cycloidal optical lens on the optical axis.

[0079] The surround optical lens meets the following conditions:

[0080] -7≤f1 / f≤-6, -2≤f2 / f≤-3, 1.5≤f5 / f≤3, 2≤f7 / f≤3

[0081] Among them, f1, f2, f5, f7, and f are respectively the focal lengths of the first meniscus negative lens 1, the second meniscus negative lens 2, the fifth double convex positive lens 5, the seventh double convex positive lens 7, and the entire lens group. By reasonably matching the focal lengths of plastic and glass lenses, it is beneficial to reduce the assembly sensitivity and control the high and low temperature back focus drift of the lens within a very small range to meet the requirements of clear imaging.

[0082] The third lens 3 can have positive or negative optical power, and its object side can be convex or concave, and its image side can be convex or concave. This lens is conducive to collecting light, reducing external field aberrations, and improving imaging quality.

[0083] The first meniscus negative lens 1 is a glass spherical lens, the second meniscus negative lens 2 is a plastic aspherical lens, the third lens 3 is a plastic aspherical lens, the fourth lens 4 is a glass spherical lens, the fifth biconvex positive lens 5, the sixth biconcave negative lens 6 and the seventh biconvex positive lens 7 are all plastic aspherical lenses.

[0084] The first meniscus negative lens 1 has a refractive index Nd1>1.8, and an Abbe number Vd1>40; the second meniscus negative lens 2 has a refractive index Nd2>1.5, and an Abbe number Vd2>55; when the third lens 3 is a plastic lens, its refractive index Nd3>1.5, and its Abbe number Vd3>55; when the fourth lens 4 is a glass lens, its refractive index Nd4>1.75, and its Abbe number Vd4<30; the fifth double convex positive lens 5 has a refractive index Nd5>1.5, and its Abbe number Vd5>55; the sixth double concave negative lens 6 has a refractive index Nd6>1.6, and its Abbe number Vd6<25; the seventh double convex positive lens 7 has a refractive index Nd7>1.5, and its Abbe number Vd7>55.

[0085] Table 3 shows the surface shape, curvature radius R, thickness and material of each lens of the panoramic optical lens of Example 2, wherein the units of the curvature radius R and thickness are both millimeters.

[0086] Table 3

[0087] Face type R-Value thickness Material S1 Spherical 12.272 1.08 1.83 42.7 S2 Spherical 3.402 1.976 S3 Aspheric 7.089 0.744 1.54 55.9 S4 Aspheric 1.022 1.711 S5 Aspheric 11.093 0.84 1.54 55.9 S6 Aspheric 9.767 0.04 S7 Spherical 3.452 2.911 1.76 27.5 S8 Spherical -7.535 -0.029 S9 Aperture endless 0.179 S10 Aspheric 2.689 1.214 1.54 55.9 S11 Aspheric -1.639 0.479 1.64 23.5 S12 Aspheric 2.153 0.092 S13 Aspheric 2.201 1.442 1.54 55.9 S14 Aspheric -1.740 1.442 CG endless 0.4 1.52 64.2 CG endless 0.0405

[0088] In Table 3, when the curvature radius of the aperture ST 11 and the protective glass CG 9 is infinite, it means that the surface is a plane.

[0089] The surface equation of an aspheric surface is as follows:

[0090]

[0091] Among them, z is the distance vector height from the vertex of the aspherical surface when the aspherical surface is at a height of r along the optical axis; c is the curvature of the paraxial aspherical surface, c=1 / R, R is the radius of curvature, and c is the reciprocal of the radius of curvature; k is the cone coefficient; α1 is the second-order coefficient of the aspherical surface, α2 is the fourth-order coefficient of the aspherical surface, α3 is the sixth-order coefficient of the aspherical surface, α4 is the eighth-order coefficient of the aspherical surface, α5 is the tenth-order coefficient of the aspherical surface, α6 is the twelfth-order coefficient of the aspherical surface, α7 is the fourteenth-order coefficient of the aspherical surface, and α8 is the sixteenth-order coefficient of the aspherical surface.

[0092] Table 4 gives the cone coefficient k and the higher-order coefficients α2, α3, α4, α5, α6, α7, α8 of S3, S4, S5, S6, S10, S11, S12, S13, and S14.

[0093] Table 4

[0094] k α2 α3 α4 α5 α6 α7 α8 S3 2.31 2.50E-3 -3.48E-3 7.74E-4 -1.06E-4 8.29E-6 -2.99E-7 2.36E-9 S4 -0.686 -1.02E-2 -3.84E-3 -4.40E-3 8.05E-4 4.44E-4 -4.16E-4 5.34E-5 S5 1.745 -1.36E-2 2.64E-3 -1.56E-3 3.88E-4 -2.31E-4 -2.15E-5 2.58E-5 S6 27.586 -1.96E-2 -8.43E-4 2.43E-4 -7.23E-4 -8.12E-5 2.07E-4 -4.01E-5 S10 -1.024 -2.11E-2 1.06E-1 -2.92E-1 4.38E-1 -3.97E-1 2.77E-1 -1.25E-1 S11 0.672 -4.56E-1 1.163 -1.717 0.576 1.992 -2.714 1.069 S12 -4.365 -1.13E-1 2.02E-1 -1.88E-1 8.88E-2 -4.35E-3 -1.34E-2 3.90E-3 S13 -12.324 -1.42E-2 3.37E-2 -1.80E-2 6.76E-3 -8.40E-4 -2.57E-4 7.31E-5 S14 -5.279 -6.77E-2 3.56E-2 -1.05E-2 2.09E-3 4.19E-4 -8.18E-5 1.35E-5

[0095] The rest is the same as in Example 1.

[0096] Example 3

[0097] like Figure 5-6 As shown, the cycloidal optical lens includes a first meniscus negative lens 1, a second meniscus negative lens 2, a third lens 3, a fourth lens 4, an aperture ST 11, a fifth biconvex positive lens 5, a sixth biconcave negative lens 6, a seventh biconvex positive lens 7, a protective glass CG 9, and an image plane IMA 10, which are arranged in sequence from left to right along the optical axis in the incident direction. The first meniscus negative lens 1 has negative optical power, and its object side surface is convex, and its image side surface is concave; the second meniscus negative lens 2 has negative optical power, and its object side surface is convex, and its image side surface is concave; the third lens 3 can have positive optical power or negative optical power, and its object side surface is convex, and its image side surface is concave; the fourth lens 4 has positive optical power, and its object side surface is convex, and its image side surface is convex; the fifth double convex positive lens 5 has positive optical power, and its object side surface is convex, and its image side surface is convex; the sixth double concave negative lens 6 has negative optical power, and its object side surface is concave, and its image side surface is concave; the seventh double convex positive lens 7 has positive optical power, and its object side surface is convex, and its image side surface is convex.

[0098] The first meniscus negative lens 1 is a glass spherical lens, the second meniscus negative lens 2 is a plastic aspherical lens, the third lens 3 is a plastic aspherical lens, the fourth lens 4 is a glass spherical lens, the fifth biconvex positive lens 5, the sixth biconcave negative lens 6 and the seventh biconvex positive lens 7 are all plastic aspherical lenses.

[0099] The first meniscus negative lens 1 has a refractive index Nd1>1.8, and an Abbe number Vd1>40; the second meniscus negative lens 2 has a refractive index Nd2>1.5, and an Abbe number Vd2>55; when the third lens 3 is a plastic lens, its refractive index Nd3>1.5, and its Abbe number Vd3>55; when the fourth lens 4 is a glass lens, its refractive index Nd4>1.75, and its Abbe number Vd4<30; the fifth double convex positive lens 5 has a refractive index Nd5>1.5, and its Abbe number Vd5>55; the sixth double concave negative lens 6 has a refractive index Nd6>1.6, and its Abbe number Vd6<25; the seventh double convex positive lens 7 has a refractive index Nd7>1.5, and its Abbe number Vd7>55.

[0100] Table 5 shows the surface shape, curvature radius R, thickness and material of each lens of the cycloidal optical lens of Example 3, wherein the units of the curvature radius R and thickness are both millimeters.

[0101] Table 5

[0102] Face type R-Value thickness Material S1 Spherical 11.864 1 1.83 42.7 S2 Spherical 3.602 2.221 S3 Aspheric 12.394 0.834 1.54 55.9 S4 Aspheric 1.117 1.575 S5 Aspheric 10.832 0.650 1.54 55.9 S6 Aspheric 4.570 0.078 S7 Spherical 2.939 3.157 1.76 27.5 S8 Spherical -8.079 0.079 S9 Aperture endless 0.020 S10 Aspheric 2.781 1.303 1.54 55.9 S11 Aspheric -1.718 0.549 1.64 23.5 S12 Aspheric 2.811 0.182 S13 Aspheric 2.339 1.355 1.54 55.9 S14 Aspheric -2.075 1.506 CG endless 0.4 1.52 64.2 CG endless 0.091

[0103] In Table 5, when the curvature radius of the aperture ST 11 and the protective glass CG 9 is infinite, it means that the surface is a plane.

[0104] The surface equation of an aspheric surface is as follows:

[0105]

[0106] Among them, z is the distance vector height from the vertex of the aspherical surface when the aspherical surface is at a height of r along the optical axis; c is the curvature of the paraxial aspherical surface, c=1 / R, R is the radius of curvature, and c is the reciprocal of the radius of curvature; k is the cone coefficient; α1 is the second-order coefficient of the aspherical surface, α2 is the fourth-order coefficient of the aspherical surface, α3 is the sixth-order coefficient of the aspherical surface, α4 is the eighth-order coefficient of the aspherical surface, α5 is the tenth-order coefficient of the aspherical surface, α6 is the twelfth-order coefficient of the aspherical surface, α7 is the fourteenth-order coefficient of the aspherical surface, and α8 is the sixteenth-order coefficient of the aspherical surface.

[0107] Table 6 gives the cone coefficient k and the higher-order coefficients α2, α3, α4, α5, α6, α7, α8 of S3, S4, S5, S6, S10, S11, S12, S13, and S14.

[0108] Table 6

[0109] k α2 α3 α4 α5 α6 α7 α8 S3 4.415 1.62E-3 -3.33E-3 8.28E-4 -1.11E-4 8.31E-6 -3.07E-7 3.79E-9 S4 -0.687 -2.16E-2 -5.28E-3 -3.46E-3 1.56E-3 5.85E-4 -4.89E-4 6.94E-5 S5 21.671 -2.61E-2 1.22E-2 -1.89E-3 2.60E-4 -2.09E-4 -2.04E-5 1.71E-5 S6 5.627 -2.49E-2 7.99E-3 1.28E-3 -1.96E-3 -2.55E-4 3.39E-4 -5.63E-5 S10 -0.6 -1.11E-2 7.74E-2 -2.60E-2 4.61E-1 -4.57E-1 2.75E-1 -9.67E-2 S11 1.597 -5.16E-1 1.523 -2.132 8.08E-1 2.057 -2.909 1.175 S12 -5.833 -1.44E-1 2.35E-2 -2.03E-1 8.98E-2 -3.64E-3 -1.31E-2 3.68E-3 S13 -14.13 -2.67E-2 3.01E-2 -1.70E-2 9.51E-3 -1.27E-3 -6.16E-4 1.59E-4 S14 -7.874 -6.66E-2 3.63E-2 -1.32E-2 3.18E-3 4.12E-4 -2.56E-4 8.77E-5

[0110] The rest is the same as in Example 1.

[0111] The parts not specifically described may adopt existing technologies and can be directly purchased on the market, so they will not be described in detail here.

[0112] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A panoramic optical lens, characterized in that: It includes a first meniscus negative lens, a second meniscus negative lens, a third lens, a fourth lens, an aperture ST, a fifth biconvex positive lens, a sixth biconcave negative lens and a seventh biconvex positive lens which are arranged in sequence from left to right along the incident direction of the optical axis, wherein the first meniscus negative lens has negative optical power, and its object side surface is convex, and its image side surface is concave, the second meniscus negative lens has negative optical power, and its object side surface is convex, and its image side surface is concave, the fifth biconvex positive lens has positive optical power, and its object side surface is convex, and its image side surface is convex, the sixth biconcave negative lens has negative optical power, and its object side surface is concave, and its image side surface is concave, and the seventh biconvex positive lens has positive optical power, and its object side surface is convex, and its image side surface is convex; The surround optical lens meets the following conditions: -7≤f1 / f≤-6, -2≤f2 / f≤-3, 1.5≤f5 / f≤3, 2≤f7 / f≤3 Among them, f1, f2, f5, f7, and f are respectively the focal lengths of the first meniscus negative lens, the second meniscus negative lens, the fifth biconvex positive lens, the seventh biconvex positive lens, and the entire lens set; The maximum field of view angle FOV of the surround optical lens, the focal length value f of the surround optical lens, and the image height h corresponding to the maximum field of view angle of the surround optical lens satisfy the following conditions: 85≤(FOV×f) / h≤100; The surround optical lens satisfies the conditional formula: D / f≤14; Wherein, D is the maximum aperture of the first meniscus negative lens on the object side corresponding to the maximum field angle of the cycloid optical lens; The surround optical lens satisfies the conditional formula: TTL / f≤17; Wherein, TTL is the distance from the center of the object side surface of the first meniscus negative lens to the imaging surface of the surround optical lens on the optical axis.

2. The panoramic optical lens according to claim 1, characterized in that: The refractive index of the first meniscus negative lens Nd1>1.8, and the Abbe number Vd1>40; the refractive index of the second meniscus negative lens Nd2>1.5, and the Abbe number Vd2>55; the refractive index of the fifth biconvex positive lens Nd5>1.5, and the Abbe number Vd5>55; the refractive index of the sixth biconcave negative lens Nd6>1.6, and the Abbe number Vd6<25; the refractive index of the seventh biconvex positive lens Nd7>1.5, and the Abbe number Vd7>55.

3. The panoramic optical lens according to claim 1, characterized in that: When the third lens is a plastic lens, the refractive index Nd3>1.5, and the Abbe number Vd3>55; when the third lens is a glass lens, the refractive index Nd3>1.75, and the Abbe number Vd3<30.

4. The panoramic optical lens according to claim 1, characterized in that: The third lens has positive or negative optical power, an object side thereof is convex or concave, and an image side surface thereof is convex or concave.

5. The panoramic optical lens according to claim 1, characterized in that: When the fourth lens is a plastic lens, the refractive index Nd4>1.5, and the Abbe number Vd4>55; when the fourth lens is a glass lens, the refractive index Nd4>1.75, and the Abbe number Vd4<30.

6. The panoramic optical lens according to claim 1, characterized in that: The fourth lens has positive refractive power, an object side thereof is convex or concave, and an image side thereof is convex.

7. An imaging device, characterized in that: It comprises the surround-view optical lens and imaging element as described in any one of claims 1 to 6, wherein the imaging element is used to convert the optical image formed by the surround-view optical lens into an electrical signal.

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