Vehicle-mounted optical lens

Abstract

The embodiment of the invention discloses a vehicle-mounted 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, a diaphragm, a fifth lens with positive focal power, a sixth lens with negative focal power and a seventh lens with positive focal power which are sequentially arranged along an optical axis; the first lens, the second lens, the third lens, the fourth lens, the sixth lens and the seventh lens are all glass spherical lenses, and the fifth lens is a glass aspheric lens. According to the vehicle-mounted optical lens, a 6G1GM optical system structure is adopted, visible light and infrared light double-spectrum cooperative work is achieved, the diagonal view field angle is 175 degrees, the total length is smaller than 17 mm, the structure is compact, and the vehicle-mounted optical lens has the advantages of being large in view field and small in size. And meanwhile, the characteristic of stable high and low temperature performance is realized by matching all-glass lenses, and the vehicle-mounted lens can be stably used at the temperature of-40 DEG C to 85 DEG C and is suitable for a vehicle-mounted application environment.

Description

TECHNICAL FIELD

[0001] The embodiment of the application relates to the technical field of optical lenses, in particular to a vehicle-mounted optical lens. BACKGROUND

[0002] The breakthrough of artificial intelligence technology and the upgrading of user safety demand jointly promote the expansion of the vehicle-mounted optical market. Monitoring cabin occupants by using a vehicle-mounted optical lens has become the core track of the industry. With the optimization of automobile safety regulations, the occupant monitoring system is listed as a mandatory standard, and the architecture of the optical lens faces three rigid constraints: dual-spectrum cooperation, extreme compactness and strong environmental adaptability. However, the current vehicle-mounted optical lens scheme mostly has problems such as complex structure, large volume and unstable performance. SUMMARY

[0003] The application provides a vehicle-mounted optical lens for realizing an optical lens with simple structure, small volume and stable performance to adapt to the requirements of automobile occupant monitoring.

[0004] The embodiment of the application provides a vehicle-mounted optical lens, which comprises, in sequence along an optical axis, a first lens with negative optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with positive optical power, a diaphragm, a fifth lens with positive optical power, a sixth lens with negative optical power and a seventh lens with positive optical power.

[0005] The first lens, the second lens, the third lens, the fourth lens, the sixth lens and the seventh lens are all glass spherical lenses, and the fifth lens is a glass aspherical lens.

[0006] Optionally, the object side surface of the first lens is a convex surface, and the image side surface is a concave surface.

[0007] The object side surface of the second lens is a convex surface, and the image side surface is a concave surface.

[0008] The object side surface of the third lens is a concave surface, a convex surface or a plane, and the image side surface is a convex surface.

[0009] The object side surface of the fourth lens is a concave surface, and the image side surface is a convex surface.

[0010] The object side surface of the fifth lens is a convex surface or a concave surface, and the image side surface is a convex surface.

[0011] The object side surface of the sixth lens is a convex surface, and the image side surface is a concave surface.

[0012] The object side surface of the seventh lens is a convex surface, and the image side surface is a convex surface.

[0013] Optionally, the sixth lens and the seventh lens are cemented to form a cemented lens group, and the cemented lens group satisfies: Φ67 / Φ<0.15;

[0014] wherein Φ67 is the optical power of the cemented lens group, and Φ is the optical power of the vehicle-mounted optical lens.

[0015] Optionally, the first lens to the seventh lens satisfy the following conditions:

[0016] -0.46≤Φ1 / Φ≤-0.08;

[0017] -0.56≤Φ2 / Φ≤-0.13;

[0018] 0.02≤Φ3 / Φ≤0.53;

[0019] -0.09≤Φ4 / Φ≤0.17;

[0020] 0.2≤Φ5 / Φ≤0.7;

[0021] -0.67≤Φ6 / Φ≤-0.3;

[0022] 0.4≤Φ7 / Φ≤0.63;

[0023] wherein Φ1, Φ2, Φ3, Φ4, Φ5, Φ6, and Φ7 are the optical powers of the first lens to the seventh lens, and Φ is the optical power of the vehicle-mounted optical lens.

[0024] Optionally, the first lens to the seventh lens satisfy the following conditions:

[0025] 1.5≤n1≤1.8; 28.74≤v1≤76.51;

[0026] 1.39≤n2≤1.78; 53.67≤v2≤95.00;

[0027] 1.73≤n3≤2.00; 25.20≤v3≤51.31;

[0028] 1.85≤n4≤2.12; 18.07≤v4≤32.42;

[0029] 1.39≤n5≤1.62; 41.81≤v5≤95.00;

[0030] 1.82≤n6≤1.97; 17.9≤v6≤21.02;

[0031] 1.41≤n7≤1.63; 45.6≤v7≤91.17;

[0032] Wherein, n1, n2, n3, n4, n5, n6, n7 are refractive indexes of the first lens to the seventh lens respectively; v1, v2, v3, v4, v5, v6, v7 are Abbe numbers of the first lens to the seventh lens respectively.

[0033] Optionally, the vehicle-mounted optical lens satisfies the following condition: 0.4≤f / IC≤1.

[0034] Wherein, f is a focal length of the vehicle-mounted optical lens, and IC is an image surface diameter of the vehicle-mounted optical lens.

[0035] Optionally, the vehicle-mounted optical lens satisfies the following condition: FOV / TTL>10.

[0036] Wherein, FOV is a maximum field of view angle of the vehicle-mounted optical lens, and TTL is an optical total length of the vehicle-mounted optical lens.

[0037] Optionally, the vehicle-mounted optical lens satisfies the following condition: f / TTL>0.12.

[0038] Wherein, f is a focal length of the vehicle-mounted optical lens, and TTL is an optical total length of the vehicle-mounted optical lens.

[0039] Optionally, the vehicle-mounted optical lens satisfies the following condition: 3≤IC / EPD≤3.6.

[0040] Wherein, IC is an image surface diameter of the vehicle-mounted optical lens, and EPD is an entrance pupil diameter of the vehicle-mounted optical lens.

[0041] Optionally, the vehicle-mounted optical lens satisfies the following condition: BFL / TTL>0.2.

[0042] Wherein, BFL is an optical back focal length of the vehicle-mounted optical lens, and TTL is an optical total length of the vehicle-mounted optical lens.

[0043] The vehicle-mounted optical lens provided by the embodiment of the application adopts 6 spherical glasses and 1 glass aspherical surface mixed combination, can correct aberration well, ensure good enough image quality, can meet high and low temperature performance stability and large field of view angle at the same time, the total length of the lens is less than 17mm, FOV can reach 175°, obtains the lens with excellent comprehensive performance such as imaging requirement, compact structure, large field of view angle, visible light and infrared light dual-spectrum collaborative work and strong environmental stability, is suitable for vehicle-mounted application environment, has good commercial value. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 is a structure schematic view of a vehicle-mounted optical lens provided by the embodiment one of the application;

[0045] Figure 2 isFigure 1 axial aberration curve of the vehicle-mounted optical lens shown in FIG. 1;

[0046] Figure 3 is a structural schematic diagram of a vehicle-mounted optical lens provided by an embodiment two of the present application;

[0047] Figure 4 is Figure 3 axial aberration curve of the vehicle-mounted optical lens shown in FIG. 1;

[0048] Figure 5 is a structural schematic diagram of a vehicle-mounted optical lens provided by an embodiment three of the present application;

[0049] Figure 6 is Figure 5 axial aberration curve of the vehicle-mounted optical lens shown in FIG. 1. DETAILED DESCRIPTION

[0050] The present application will be further described below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for the convenience of description, only the parts related to the present application are shown in the drawings, but not all the structures.

[0051] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. It should be noted that the orientation words such as "upper", "lower", "left", "right" and the like described in the embodiments of the present application are described with the angle shown in the drawings, and should not be understood as limiting the embodiments of the present application. In addition, it should be understood in the context that when referring to an element being formed "on" or "under" another element, it can be directly formed "on" or "under" another element, or indirectly formed "on" or "under" another element through an intermediate element. The terms "first", "second" and the like are only for the purpose of description, and do not represent any order, quantity or importance, but are only used to distinguish different components. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0052] The term "including" and its variants used in the present application are open inclusion, i.e. "including but not limited to". The term "based on" is "at least partially based on". The term "one embodiment" means "at least one embodiment".

[0053] It should be noted that the concepts of "first", "second" and the like mentioned in the present application are only used to distinguish the corresponding content, and are not used to limit the order or mutual dependency.

[0054] It should be noted that the terms "a" and "a plurality of" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0055] Figure 1 This is a schematic diagram of the structure of a vehicle-mounted optical lens provided in Embodiment 1 of the present invention, for reference. Figure 1 The vehicle-mounted optical lens includes, arranged sequentially along the optical axis, a first lens 1 with negative optical power, a second lens 2 with negative optical power, a third lens 3 with positive optical power, a fourth lens 4 with positive optical power, an aperture stop STO, a fifth lens 5 with positive optical power, a sixth lens 6 with negative optical power, and a seventh lens 7 with positive optical power. The first lens 1, second lens 2, third lens 3, fourth lens 4, sixth lens 6, and seventh lens 7 are all spherical glass lenses, while the fifth lens 5 is an aspherical glass lens.

[0056] First, for optical lenses, optical power equals the difference between the image-side beam convergence and the object-side beam convergence; it characterizes the optical system's ability to deflect light. The larger the absolute value of optical power, the stronger the bending ability of light; the smaller the absolute value, the weaker the bending ability. When optical power is positive, the refraction of light is converging; when optical power is negative, the refraction of light is diverging. Optical power can be used to characterize a single refractive surface of a lens (i.e., one surface of the lens), a single lens, or a system formed by multiple lenses (i.e., a lens group).

[0057] In the vehicle-mounted optical lens provided in this embodiment, each lens can be mounted in a single lens barrel. Figure 1 (not shown in the image) such as Figure 1As shown, in the embodiment of the present application, the optical lens is composed of six glass spherical lenses and one glass aspherical lens, and the optical power of the seven lenses is cooperated with each other to realize the design of the optical lens with simple structure, small size, and stable performance. Specifically, the optical power of the first lens 1 and the second lens 2 is negative, which can make the object light gently enter the imaging system, so that the light enters the third lens 3 with a small incident angle, and the proportion of high-order aberration is reduced. The optical power of the third lens 3 and the fourth lens 4 is positive, which can further gently shrink the angle of the light, so that the system has a relatively loose tolerance sensitivity. The stop STO is arranged between the fourth lens 4 and the fifth lens 5, which essentially limits the specific position of the stop STO in the waist of the entire optical system, thereby accurately controlling the light quantity, expanding the light height of the central chief ray at the position of the stop STO, expanding the aperture, ensuring the amount of light passing through the stop STO, and ensuring the imaging brightness; in addition, the stop STO can block the off-axis light, effectively reduce the off-axis aberration, and ensure the clarity of the imaging. The fifth lens 5, the sixth lens 6 and the seventh lens 7 adopt positive, negative and positive power distribution, which can cooperate with the optical power of the previous four lenses to ensure compact structure and realize large field of view and miniaturization.

[0058] In addition, the present application sets seven lenses as glass lenses, which can utilize the characteristics of glass material to reduce the sensitivity of imaging to temperature, reduce the deformation degree of the lens at different temperatures, ensure clear imaging in high and low temperature environments, thereby realizing the characteristics of stable performance at high and low temperatures, meeting the stable use of-40℃~85℃, and adapting to the vehicle application environment. Further, the fifth lens 5 is set as an aspherical lens, which utilizes as few aspherical lenses to correct aberration, especially spherical aberration, thereby ensuring imaging quality and enabling clear imaging in visible light and infrared light bands, realizing the dual-spectrum collaborative work of visible light and infrared light. Moreover, the preparation of glass aspherical lenses is difficult, and the use of a small number of glass aspherical lenses can also reduce the overall preparation cost, which is conducive to expanding the application.

[0059] The vehicle-mounted optical lens provided by the embodiment of the present application adopts 6 spherical glass and 1 glass aspherical hybrid combination, which can well correct aberration and ensure good image quality, can meet the stable performance at high and low temperatures and large field of view angle, the total length of the lens is less than 17mm, and the FOV can reach 175°, so that a lens with excellent comprehensive performance such as imaging requirement, compact structure, large field of view angle, dual-spectrum collaborative work of visible light and infrared light, and strong environmental stability is obtained, which is suitable for vehicle application environment and has good commercial value.

[0060] In a specific embodiment, optionally, the object side surface of the first lens 1 is convex, and the image side surface is concave; the object side surface of the second lens 2 is convex, and the image side surface is concave; the object side surface of the third lens 3 is concave or convex or flat, and the image side surface is convex; the object side surface of the fourth lens 4 is concave, and the image side surface is convex; the object side surface of the fifth lens 5 is convex or concave, and the image side surface is convex; the object side surface of the sixth lens 6 is convex, and the image side surface is concave; the object side surface of the seventh lens 7 is convex, and the image side surface is convex.

[0061] This embodiment is essentially to set the first lens 1 and the second lens 2 as meniscus lenses, so that the light can enter the optical system better, and the light can propagate smoothly without large deflection, so as to avoid introducing larger aberration. At the same time, it is beneficial to reduce the aperture and total length of the lens.

[0062] In a specific embodiment, optionally, the sixth lens 6 and the seventh lens 7 are cemented to form a cemented lens group, and the cemented lens group satisfies: Φ67 / Φ<0.15; wherein Φ67 is the optical power of the cemented lens group, and Φ is the optical power of the vehicle-mounted optical lens.

[0063] The use of cemented lenses can not only reduce the distance between lenses and further compress the total length of the lens, but also be beneficial to appropriately correct chromatic aberration, improve field curvature and coma, thereby further optimizing the imaging quality.

[0064] In a specific embodiment, optionally, the first lens 1 to the seventh lens 7 satisfy the following conditions: -0.46≤Φ1 / Φ≤-0.08; -0.56≤Φ2 / Φ≤-0.13; 0.02≤Φ3 / Φ≤0.53; -0.09≤Φ4 / Φ≤0.17; 0.2≤Φ5 / Φ≤0.7; -0.67≤Φ6 / Φ≤-0.3; 0.4≤Φ7 / Φ≤0.63; wherein Φ1, Φ2, Φ3, Φ4, Φ5, Φ6, Φ7 are the optical powers of the first lens 1 to the seventh lens 7 respectively, and Φ is the optical power of the vehicle-mounted optical lens.

[0065] In a specific embodiment, optionally, the first lens 1 to the seventh lens 7 satisfy the following conditions: 1.5≤n1≤1.8; 28.74≤v1≤76.51; 1.39≤n2≤1.78; 53.67≤v2≤95.00; 1.73≤n3≤2.00; 25.20≤v3≤51.31; 1.85≤n4≤2.12; 18.07≤v4≤32.42; 1.39≤n5≤1.62; 41.81≤v5≤95.00; 1.82≤n6≤1.97; 17.9≤v6≤21.02; 1.41≤n7≤1.63; 45.6≤v7≤91.17; wherein n1, n2, n3, n4, n5, n6, n7 are the refractive indices of the first lens 1 to the seventh lens 7 respectively; v1, v2, v3, v4, v5, v6, v7 are the Abbe numbers of the first lens 1 to the seventh lens 7 respectively.

[0066] In the above embodiments, by setting reasonable focal length ranges and corresponding suitable refractive indices and Abbe number ranges, a lens with compact structure, large field of view and miniaturization can be realized, and system aberrations can be corrected to ensure the clarity of imaging.

[0067] In a specific embodiment, optionally, the vehicle-mounted optical lens satisfies the following condition: 0.4≤f / IC≤1; wherein f is the focal length of the vehicle-mounted optical lens, and IC is the image surface diameter of the vehicle-mounted optical lens.

[0068] This embodiment limits the vehicle-mounted optical lens to satisfy the above condition, indicating that the lens has wide-angle performance and can ensure the shooting range of the optical system, so that the system has a large field of view.

[0069] In a specific embodiment, optionally, the vehicle-mounted optical lens satisfies the following condition: FOV / TTL>10; wherein FOV is the maximum field of view angle of the vehicle-mounted optical lens, and TTL is the total optical length of the vehicle-mounted optical lens.

[0070] This embodiment limits the vehicle-mounted optical lens to satisfy the above condition, indicating that the optical lens has a large field of view angle and a short total optical length, ensuring the miniaturization of the system.

[0071] In a specific embodiment, optionally, the vehicle-mounted optical lens satisfies the following condition: f / TTL>0.12; wherein f is the focal length of the vehicle-mounted optical lens, and TTL is the total optical length of the vehicle-mounted optical lens.

[0072] This embodiment limits the vehicle-mounted optical lens to satisfy the above condition, indicating that the optical lens has a short total optical length, which is also convenient for realizing the miniaturization of the system.

[0073] In a specific embodiment, optionally, the vehicle-mounted optical lens satisfies the following condition: 3≤IC / EPD≤3.6; wherein IC is the image diameter of the vehicle-mounted optical lens, and EPD is the entrance pupil diameter of the vehicle-mounted optical lens.

[0074] The embodiment limits the vehicle-mounted optical lens to satisfy the above condition, which can make the optical lens satisfy the large image surface and high-quality imaging while controlling the entrance pupil diameter of the optical system, ensuring sufficient light for the edge field of view of the large image surface and ultra-wide-angle imaging system, and improving the image surface brightness.

[0075] In a specific embodiment, optionally, the vehicle-mounted optical lens satisfies the following condition: BFL / TTL>0.2; wherein BFL is the optical back focal length of the vehicle-mounted optical lens, and TTL is the optical total length of the vehicle-mounted optical lens.

[0076] The embodiment limits the vehicle-mounted optical lens to satisfy the above condition, which can ensure sufficient installation space for the imaging sensor and the flat filter.

[0077] Based on the same concept, the present application provides three different specific embodiments, and the optical power relationship and related physical optical parameter design range are shown in Table 1:

[0078] Table 1: Lens optical power relationship and related physical optical parameter design values in three embodiments

[0079]

[0080]

[0081] In the first embodiment of the present application, referring to Figure 1 The structure of each element of the system and the shape and position of each element are crucial to the system. As shown in the figure, the optical lens is composed of 6 glass spherical lenses and 1 glass aspherical lens, wherein the stop STO is located between the fourth lens 4 and the fifth lens 5. An optical filter 8 is also arranged along the object plane to the image plane; the optical filter 8 is located on the image side surface of the seventh lens 7, and the optical filter 8 can protect the photosensitive chip in the imaging sensor to ensure the imaging effect of the vehicle-mounted optical lens. The sixth lens 6 and the seventh lens 7 are cemented. The optical performance parameters of the vehicle-mounted optical lens are as follows: focal length f is 2.24mm, field of view angle is 175°, and aperture is F2.0. As shown in Figure 1 The parameter design values of each lens in the vehicle-mounted optical lens of the first embodiment are shown in Table 2:

[0082] Table 2: One design value of each lens in the vehicle-mounted optical lens in the first embodiment

[0083]

[0084]

[0085] The surface numbers in Table 1 are assigned according to the surface sequence of each lens. "STO" represents the aperture stop of the lens; "IMA" represents the image plane of the lens; the radius of curvature represents the curvature of the lens surface, with a positive value indicating that the surface bends towards the image plane and a negative value indicating that the surface bends towards the object plane. "PL" indicates that the surface is flat and the radius of curvature is infinite; the thickness represents the central axial distance between the current surface and the next surface; the refractive index represents the ability of the material between the current surface and the next surface to deflect light, with a blank space indicating 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, with a blank space indicating that the current position is air.

[0086] The formula for aspherical surfaces is shown below:

[0087]

[0088] Where Z is the sag of the aspherical surface, c is the fundamental curvature at the vertex, k is the conic section constant, r is the radial coordinate perpendicular to the optical axis, and a i a is the coefficient of the higher-order term. i r 2i These are higher-order terms for aspherical surfaces. The coefficients of the 14th and 16th order terms, which are not shown, are defaulted to 0. The coefficients of the even-order terms for each aspherical surface in Example 1 above are shown in Table 3:

[0089] Table 3. Aspherical parameters of each lens in the vehicle-mounted optical lens in Example 1.

[0090] Surface No. k [a2] [a3] [a4] [a5] [a6] S10 -6.1745 -8.71E-03 4.49E-03 -5.18E-03 2.31E-03 -3.97E-04 S11 0.449 7.17E-03 -1.17E-03 6.06E-04 -1.28E-04 1.19E-05

[0091] Where -8.71E-03 indicates that the coefficient a2 of surface number S10 is -8.71*10. -3 And so on.

[0092] Figure 2 for Figure 1 The axial aberration curve of the vehicle-mounted optical lens shown is for reference. Figure 2 The vertical direction represents the normalized aperture, 0 indicates it is on 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 the system imaging, determined by... Figure 2 It can be seen that the axial aberrations of different wavelengths are all controlled within the range of (-0.03mm, +0.03mm), indicating that the spherical aberration of the vehicle-mounted optical lens is well controlled at each wavelength.

[0093] Figure 3 This is a schematic diagram of the structure of a vehicle-mounted optical lens provided in Embodiment 2 of the present invention, for reference. Figure 3In the second embodiment of the present application, the structural composition of each element of the system and the shape and position of each element are crucial to the system. As shown in the figure, the optical lens is composed of 6 glass spherical lenses and 1 glass aspherical lens, wherein the stop STO is located between the fourth lens 4 and the fifth lens 5. A filter 8 is further arranged along the object plane to the image plane; the filter 8 is located on the image side surface of the seventh lens 7, and the filter 8 can protect the photosensitive chip in the imaging sensor to ensure the imaging effect of the vehicle-mounted optical lens. The sixth lens 6 and the seventh lens 7 are cemented. The optical performance parameters of the vehicle-mounted optical lens are as follows: the focal length f is 2.48 mm, the field of view angle is 175°, and the aperture is F2.2. As shown in the second embodiment of the vehicle-mounted optical lens, the design values of the parameters of each lens are shown in Table 4: Figure 3

[0094] Table 4 shows a design value of each lens of the vehicle-mounted optical lens in the second embodiment

[0095]

[0096]

[0097] The surface number in Table 4 is numbered according to the surface order of each lens, “STO” represents the stop of the lens; “IMA” represents the image plane of the lens; the radius of curvature represents the bending degree of the lens surface, the positive value represents that the surface bends to the image side, and the negative value represents that the surface bends to the object side, wherein “PL” represents that the surface is a plane, and the radius of curvature is infinite; the thickness represents the center axis distance from the current surface to the next surface; the refractive index represents the deflection ability of the material between the current surface and the next surface; the 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, and the space represents that the current position is air.

[0098] The aspherical surface formula is as follows:

[0099]

[0100] wherein Z is the sag of the aspherical surface, c is the basic curvature at the vertex, k is the conic constant, r is the radial coordinate perpendicular to the optical axis, a i is the high-order term coefficient, a i r 2i is the high-order term of the aspherical surface. The 14th order and 16th order term coefficients not shown are defaulted to 0. The even order term coefficients of each aspherical surface in the above second embodiment are shown in Table 5:

[0101] Table 5 shows the aspherical surface parameters of each lens of the vehicle-mounted optical lens in the second embodiment

[0102] Surface No. k [a2] [a3] [a4] [a5] [a6] S10 7.6274 -1.38E-02 1.65E-03 -2.63E-03 1.04E-03 -2.01E-04 S11 0.1028 9.51E-04 1.66E-03 -1.28E-03 3.32E-04 -3.76E-05 ​

[0103] Where -1.38E-02 indicates that the coefficient a2 of surface number S10 is -1.38 * 10. -2 And so on.

[0104] Figure 4 for Figure 3 The axial aberration curve of the vehicle-mounted optical lens shown is for reference. Figure 4 The vertical direction represents the normalized aperture, 0 indicates being on 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 system imaging, determined by... Figure 4 It can be seen that the axial aberrations of different wavelengths are all controlled within the range of (-0.03mm, +0.03mm), indicating that the spherical aberration of the vehicle-mounted optical lens is well controlled at each wavelength.

[0105] Figure 5 This is a schematic diagram of the structure of a vehicle-mounted optical lens provided in Embodiment 3 of the present invention, for reference. Figure 5 In Embodiment 3 of the present invention, the structural composition, shape, and position of each component of the system are crucial to the system. As shown in the figure, the optical lens is composed of six spherical glass lenses and one aspherical glass lens, with the aperture stop STO located between the fourth lens 4 and the fifth lens 5. A filter 8 is also provided along the object plane to the image plane; the filter 8 is located on the image-side surface of the seventh lens 7, and the filter 8 protects the photosensitive chip in the imaging sensor to ensure the imaging effect of the vehicle-mounted optical lens. The sixth lens 6 and the seventh lens 7 are cemented together. The optical performance parameters of this vehicle-mounted optical lens are as follows: focal length f = 2.13 mm, field of view = 175°, aperture = F2.2. Figure 5 The parameter design values ​​of each lens in the vehicle-mounted optical lens of Embodiment 3 are shown in Table 6:

[0106] Table 6 shows a design value for each lens in the vehicle-mounted optical lens in Example 3.

[0107]

[0108]

[0109] The surface sequence number in Table 6 is numbered according to the surface sequence of each lens, "STO" represents the stop of the lens; "IMA" represents the image surface of the lens; the radius of curvature represents the bending degree of the lens surface, a positive value represents that the surface is bent towards the image side, and a negative value represents that the surface is bent towards the object side, wherein "PL" represents that the surface is a plane, and the radius of curvature is infinite; the thickness represents the center axis distance from the current surface to the next surface; the refractive index represents the deflection ability of the material between the current surface and the next surface; the 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, and the space represents that the current position is air.

[0110] The aspheric surface formula is as follows:

[0111]

[0112] wherein Z is the sag of the aspheric surface, c is the basic curvature at the vertex, k is the conic constant, r is the radial coordinate perpendicular to the optical axis, a i is the high-order term coefficient, a i r 2i is the high-order term of the aspheric surface. The 14th order and 16th order term coefficients not shown are by default 0. The even-order term coefficients of each aspheric surface in the above embodiment three are shown in Table 7:

[0113] Table 7 Aspheric surface parameters of each lens of the vehicle-mounted optical lens in embodiment three

[0114] Surface No. k [a2] [a3] [a4] [a5] [a6] S10 -38.3579 -1.23E-02 8.35E-04 -4.06E-03 2.15E-03 -5.10E-04 S11 0.8164 7.30E-03 -2.53E-03 1.42E-03 -3.71E-04 4.34E-05

[0115] wherein -1.23E-02 represents that the coefficient a2 of the surface sequence number S10 is -1.23*10 -2 , and the like.

[0116] Figure 6 is Figure 5 the axial aberration curve diagram of the vehicle-mounted optical lens shown in the above embodiment three, reference Figure 6 , the normalized aperture is represented in the vertical direction, 0 represents on the optical axis, and the vertical direction vertex represents the maximum pupil radius; the horizontal direction represents the offset amount relative to the ideal focus point, and the unit is millimeter (mm). Different line curves in the figure represent different wavelengths of system imaging, and the like. Figure 6 It can be seen that the axial aberrations of different wavelengths are controlled within the range of (-0.03mm, +0.03mm), which indicates that the spherical aberration of the vehicle-mounted optical lens at each wavelength is well controlled.

[0117] Note that the above merely describes preferred embodiments of the present application and the principles of the technology applied. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, modifications, combinations and substitutions can be made by those skilled in the art without departing from the scope of the present application. Therefore, although the present application has been described in detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the claims.

Claims

1. A vehicle-mounted optical lens, characterized by, The first lens, the second lens, the third lens, the fourth lens, the sixth lens and the seventh lens are all glass spherical lenses, and the fifth lens is a glass aspherical lens.

2. The vehicle-mounted optical lens according to claim 1, wherein the object side surface of the first lens is a convex surface, and the image side surface is a concave surface; the object side surface of the second lens is a convex surface, and the image side surface is a concave surface; the object side surface of the third lens is a concave surface, a convex surface or a plane, and the image side surface is a convex surface; the object side surface of the fourth lens is a concave surface, and the image side surface is a convex surface; the object side surface of the fifth lens is a convex surface or a concave surface, and the image side surface is a convex surface; the object side surface of the sixth lens is a convex surface, and the image side surface is a concave surface; and the object side surface of the seventh lens is a convex surface, and the image side surface is a convex surface. The sixth lens and the seventh lens are mutually cemented to form a cemented lens group, and the cemented lens group satisfies: Φ67 / Φ < 0.15; wherein Φ67 is the focal power of the cemented lens group, and Φ is the focal power of the vehicle-mounted optical lens. The first lens to the seventh lens satisfy the following conditions: -0.46≤Φ1 / Φ≤-0.08; -0.56≤Φ2 / Φ≤-0.13; 0.02≤Φ3 / Φ≤0.53; -0.09≤Φ4 / Φ≤0.17; 0.2≤Φ5 / Φ≤0.7; -0.67≤Φ6 / Φ≤-0.3; 0.4≤Φ7 / Φ≤0.63; wherein Φ1, Φ2, Φ3, Φ4, Φ5, Φ6, Φ7 are the focal powers of the first lens to the seventh lens respectively, and Φ is the focal power of the vehicle-mounted optical lens. The first lens to the seventh lens satisfy the following conditions: 1.5≤n1≤1.8; 28.74≤v1≤76.51; 1.39≤n2≤1.78; 53.67≤v2≤95.00; 1.73≤n3≤2.00; 25.20≤v3≤51.31; 1.85≤n4≤2.12; 18.07≤v4≤32.42; 1.39≤n5≤1.62; 41.81≤v5≤95.00; 1.82≤n6≤1.97; 17.9≤v6≤21.02; 1.41≤n7≤1.63; 45.6≤v7≤91.17; wherein n1, n2, n3, n4, n5, n6, n7 are the refractive indexes of the first lens to the seventh lens respectively, and v1, v2, v3, v4, v5, v6, v7 are the Abbe numbers of the first lens to the seventh lens respectively. The vehicle-mounted optical lens satisfies the following condition: 0.4≤f / IC≤1; wherein f is the focal length of the vehicle-mounted optical lens, and IC is the image surface diameter of the vehicle-mounted optical lens. The vehicle-mounted optical lens satisfies the following condition: FOV / TTL>10; ​ ​ ​ 3. The vehicle-mounted optical lens according to claim 1, characterized in that, ​ ​ 4. The vehicle-mounted optical lens according to claim 1, characterized in that, ​ ​ ​ ​ ​ ​ ​ ​ ​ 5. The vehicle-mounted optical lens according to claim 1, characterized in that, ​ ​ ​ ​ ​ ​ ​ ​ ​ 6. The vehicle-mounted optical lens according to claim 1, wherein ​ ​ 7. The vehicle-mounted optical lens according to claim 1, wherein ​ Wherein, FOV is the maximum field of view of the vehicle-mounted optical lens, TTL is the total optical length of the vehicle-mounted optical lens.

8. The vehicle-mounted optical lens according to claim 1, characterized in that, The vehicle-mounted optical lens satisfies the condition: f / TTL>0.12; Wherein, f is the focal length of the vehicle-mounted optical lens, TTL is the total optical length of the vehicle-mounted optical lens.

9. The vehicle-mounted optical lens according to claim 1, characterized in that, The vehicle-mounted optical lens satisfies the condition: 3≤IC / EPD≤3.6; Wherein, IC is the image diameter of the vehicle-mounted optical lens, EPD is the entrance pupil diameter of the vehicle-mounted optical lens.

10. The vehicle-mounted optical lens according to claim 1, characterized in that, The vehicle-mounted optical lens satisfies the condition: BFL / TTL>0.2; Wherein, BFL is the optical back focal length of the vehicle-mounted optical lens, TTL is the total optical length of the vehicle-mounted optical lens.

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