A vehicle-mounted optical lens

Abstract

This utility model discloses an automotive 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, an aperture stop, a fifth lens with positive optical power, a sixth lens with negative optical power, and a seventh lens with positive optical power, arranged sequentially along the optical axis. The first, second, third, fourth, sixth, and seventh lenses are all glass spherical lenses, while the fifth lens is a glass aspherical lens. This utility model adopts a 6G1GM optical system structure, achieving dual-spectrum operation of visible and infrared light, with a diagonal field of view of 175°, a total length of less than 17mm, and a compact structure, featuring a large field of view and miniaturization. Furthermore, the use of all-glass lenses ensures stable performance at high and low temperatures, meeting the requirements of stable operation from -40℃ to 85℃, making it suitable for automotive applications.

Description

Technical Field

[0001] This utility model relates to the field of optical lens technology, and in particular to an automotive optical lens. Background Technology

[0002] Breakthroughs in artificial intelligence technology and escalating user safety demands have jointly driven the expansion of the automotive optics market, with occupant monitoring using automotive optical lenses emerging as a core industry segment. As automotive safety regulations become more stringent, occupant monitoring systems are now mandatory standard equipment, placing triple constraints on their optical lens architecture: dual-spectral synergy, extreme compactness, and strong environmental adaptability. However, current automotive optical lens solutions often suffer from complex structures, large sizes, and unstable performance. Utility Model Content

[0003] This invention provides a vehicle-mounted optical lens that achieves a simple structure, small size, and stable performance to meet the requirements of vehicle occupant monitoring.

[0004] This utility model embodiment provides a vehicle-mounted optical lens, including a first lens with negative optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with positive optical power, an aperture, a fifth lens with positive optical power, a sixth lens with negative optical power, and a seventh lens with positive optical power arranged sequentially along the optical axis.

[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 convex, and the image-side surface is concave.

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

[0008] The object-side surface of the third lens is concave, convex, or flat, while the image-side surface is convex.

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

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

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

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

[0013] Optionally, the sixth lens and the seventh lens are cemented together to form a cemented lens group, wherein 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 condition:

[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, respectively, and Φ is the optical power of the vehicle-mounted optical lens.

[0024] Optionally, the first to seventh lenses 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, and n7 are the refractive indices of the first lens to the seventh lens, respectively; and v1, v2, v3, v4, v5, v6, and v7 are the 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] Where f is the focal length of the vehicle-mounted optical lens, and IC is the image plane 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 the maximum field of view of the vehicle-mounted optical lens, and TTL is the total optical length of the vehicle-mounted optical lens.

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

[0038] Where f is the focal length of the vehicle-mounted optical lens, and TTL is the total optical 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 the image plane diameter of the vehicle-mounted optical lens, and EPD is the 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 the optical back focal length of the vehicle-mounted optical lens, and TTL is the total optical length of the vehicle-mounted optical lens.

[0043] The vehicle-mounted optical lens provided in this embodiment of the invention employs a hybrid combination of 6 spherical glass elements and 1 aspherical glass element, which can effectively correct aberrations and ensure sufficiently good image quality. It can simultaneously meet the requirements of stable performance at high and low temperatures and a large field of view. The total length of the lens is less than 17mm, and the FOV can reach 175°. It is a lens with excellent comprehensive performance that meets imaging requirements, has a compact structure, a large field of view, dual-spectrum operation of visible and infrared light, and strong environmental stability. It is suitable for vehicle-mounted applications and has good commercial value. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the structure of a vehicle-mounted optical lens provided in Embodiment 1 of this utility model;

[0045] Figure 2for Figure 1 The diagram shows the axial aberration curves of the vehicle-mounted optical lens.

[0046] Figure 3 This is a schematic diagram of the structure of a vehicle-mounted optical lens provided in Embodiment 2 of this utility model;

[0047] Figure 4 for Figure 3 The diagram shows the axial aberration curves of the vehicle-mounted optical lens.

[0048] Figure 5 This is a schematic diagram of the structure of a vehicle-mounted optical lens provided in Embodiment 3 of this utility model;

[0049] Figure 6 for Figure 5 The diagram shows the axial aberration curves of the vehicle-mounted optical lens. Detailed Implementation

[0050] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0051] The terminology used in the embodiments of this utility model is for the purpose of describing specific embodiments only and is not intended to limit the utility model. It should be noted that directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this utility model are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this utility model. Furthermore, in the context, it should be understood that when referring to an element being formed "upper" or "lower" of another element, it can be formed not only directly "upper" or "lower" of the other element, but also indirectly "upper" or "lower" of the other element through an intermediate element. The terms "first," "second," etc., are used for descriptive purposes only and do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0052] The term "comprising" and its variations as used in this utility model are open-ended, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment".

[0053] It should be noted that the concepts of "first" and "second" mentioned in this utility model are only used to distinguish the corresponding contents and are not used to limit the order or interdependence.

[0054] It should be noted that the terms "a" and "a plurality of" used in this utility model 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 this utility model, 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 this utility model, an optical lens is composed of six spherical glass lenses and one aspherical glass lens. The optical powers of these seven lenses work together to achieve a simple, miniaturized, and stable optical lens design. Specifically, the optical powers of the first lens 1 and the second lens 2 are negative, allowing object-side light rays to enter the imaging system smoothly and enter the third lens 3 at a smaller angle of incidence, reducing the proportion of higher-order aberrations. The optical powers of the third lens 3 and the fourth lens 4 are positive, further smoothing the angle of light deflection and giving the system a more relaxed tolerance. An aperture stop STO is placed between the fourth lens 4 and the fifth lens 5. Essentially, this limits the specific position of the aperture stop STO at the waist of the entire optical system, thereby precisely controlling the amount of light transmitted, increasing the height of the central principal ray at the aperture stop STO position, widening the aperture, and ensuring the amount of light transmitted through the aperture stop STO, thus ensuring image brightness. Furthermore, the aperture stop STO can block off-axis light rays, effectively reducing off-axis aberrations and ensuring image sharpness. The fifth lens 5, the sixth lens 6, and the seventh lens 7 are allocated positive, negative, and positive optical power, which can be matched with the optical power of the previous four lenses to ensure a compact structure and achieve a large field of view and miniaturization.

[0058] In addition, this invention uses seven glass lenses, which utilizes the properties of glass to reduce the image's sensitivity to temperature and minimize lens deformation at different temperatures. This ensures clear imaging under both high and low temperature conditions, achieving stable performance from -40℃ to 85℃, making it suitable for automotive applications. Furthermore, the fifth lens (5) is aspherical, using as few aspherical lenses as possible to correct aberrations, especially spherical aberration, thus ensuring image quality and clear imaging in both visible and infrared wavelengths, achieving dual-spectrum operation. Moreover, glass aspherical lenses are difficult to manufacture; using fewer glass aspherical lenses reduces overall manufacturing costs and facilitates wider application.

[0059] The vehicle-mounted optical lens provided in this embodiment of the invention employs a hybrid combination of 6 spherical glass elements and 1 aspherical glass element, which can effectively correct aberrations and ensure sufficiently good image quality. It can simultaneously meet the requirements of stable performance at high and low temperatures and a large field of view. The total length of the lens is less than 17mm, and the FOV can reach 175°. It is a lens with excellent comprehensive performance that meets imaging requirements, has a compact structure, a large field of view, dual-spectrum operation of visible and infrared light, and strong environmental stability. It is suitable for vehicle-mounted applications and has good commercial value.

[0060] In one 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, 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; and the object-side surface of the seventh lens 7 is convex and the image-side surface is convex.

[0061] This embodiment essentially sets both the first lens 1 and the second lens 2 as meniscus lenses, which allows light to enter the optical system more effectively and propagate smoothly without excessive deflection, thus preventing the introduction of greater aberrations. At the same time, it helps to reduce the lens aperture and overall length.

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

[0063] Using cemented lenses not only reduces the spacing between lenses and further compresses the overall length of the lens, but also helps to properly correct chromatic aberration, improve field curvature and coma, thereby further optimizing image quality.

[0064] In one 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, and 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 one 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≤1.6 2; 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; where n1, n2, n3, n4, n5, n6, and n7 are the refractive indices of the first lens 1 to the seventh lens 7, respectively; and v1, v2, v3, v4, v5, v6, and v7 are the Abbe numbers of the first lens 1 to the seventh lens 7, respectively.

[0066] In the above embodiments, by setting a reasonable range of optical power and a corresponding appropriate range of refractive index and Abbe number, a compact, large field of view, and miniaturized lens can be achieved, while system aberrations can be corrected to ensure image clarity.

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

[0068] This embodiment specifies that the vehicle-mounted optical lens meets the above conditions, indicating that the lens has wide-angle performance, which can guarantee the shooting range of the optical system and give the system a large field of view.

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

[0070] This embodiment specifies that the vehicle-mounted optical lens meets the above conditions, indicating that the optical lens has a large field of view and a short total optical length, thus ensuring the miniaturization of the system.

[0071] In one specific embodiment, optionally, the vehicle-mounted optical lens satisfies the following condition: f / TTL > 0.12; where 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 specifies that the vehicle-mounted optical lens meets the above conditions, indicating that the optical lens has a shorter overall optical length, which also facilitates the miniaturization of the system.

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

[0074] This embodiment limits the vehicle-mounted optical lens to meet the above conditions, which enables the optical lens to control the entrance pupil diameter of the optical system while satisfying the requirements of large image plane and high-quality imaging, ensuring sufficient light at the edge of the large image plane and ultra-wide-angle imaging system, and improving the brightness of the image plane.

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

[0076] This embodiment limits the vehicle-mounted optical lens to meet the above conditions, ensuring that the imaging sensor and the flat panel filter have sufficient installation space.

[0077] Based on the same concept, this utility model provides three different specific embodiments, and their optical power relationship and related physical optical parameter design ranges are shown in Table 1:

[0078] Table 1 shows the relationship between the optical power of each lens and the design values ​​of related physical and optical parameters in the three embodiments.

[0079]

[0080]

[0081] In Embodiment 1 of this utility model, reference is made to... Figure 1 The structure, shape, and location of each component in the system are known, which is crucial for the system. As shown in the figure, the optical lens consists 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 positioned along the object plane to the image plane; filter 8 is located on the image-side surface of the seventh lens 7, and it 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 = 2.24mm, field of view = 175°, aperture = F2.0. Figure 1 The parameter design values ​​of each lens in the vehicle-mounted optical lens of Embodiment 1 are shown in Table 2:

[0082] Table 2 shows a design value for each lens in the vehicle-mounted optical lens in Example 1.

[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] Face number k <![CDATA[a2]]> <![CDATA[a3]]> <![CDATA[a4]]> <![CDATA[a5]]> <![CDATA[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 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 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 this utility model, for reference. Figure 3 In Embodiment 2 of this utility model, 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 = 2.48mm, field of view = 175°, aperture = F2.2. Figure 3 The parameter design values ​​of each lens in the vehicle-mounted optical lens of Embodiment 2 are shown in Table 4:

[0094] Table 4 shows a design value for each lens in the vehicle-mounted optical lens in Example 2.

[0095]

[0096]

[0097] The surface numbers in Table 4 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.

[0098] The formula for aspherical surfaces is shown below:

[0099]

[0100] 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 2 above are shown in Table 5:

[0101] Table 5. Aspherical parameters of each lens in the vehicle-mounted optical lens in Example 2.

[0102] Face number k <![CDATA[a2]]> <![CDATA[a3]]> <![CDATA[a4]]> <![CDATA[a5]]> <![CDATA[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 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 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 structural schematic diagram of a vehicle-mounted optical lens provided in Embodiment 3 of this utility model, for reference. Figure 5 In Embodiment 3 of this utility model, 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 = 2.13mm, 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 numbers in Table 6 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.

[0110] The formula for aspherical surfaces is shown below:

[0111]

[0112] 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 3 above are shown in Table 7.

[0113] Table 7. Aspherical parameters of each lens in the vehicle-mounted optical lens in Example 3.

[0114] Face number k <![CDATA[a2]]> <![CDATA[a3]]> <![CDATA[a4]]> <![CDATA[a5]]> <![CDATA[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] Where -1.23E-02 indicates that the coefficient a2 of surface number S10 is -1.23 * 10. -2 And so on.

[0116] Figure 6 for Figure 5 The axial aberration curve of the vehicle-mounted optical lens shown is for reference. Figure 6 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 6 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.

[0117] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Many other equivalent embodiments may be included without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A vehicle-mounted optical lens, characterized in that, It includes 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, an aperture, a fifth lens with positive optical power, a sixth lens with negative optical power, and a seventh lens with positive optical power, arranged sequentially along the 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 aspherical lens.

2. The vehicle-mounted optical lens according to claim 1, characterized in that, The object-side surface of the first lens is convex, and the image-side surface is concave. The object-side surface of the second lens is convex, and the image-side surface is concave. The object-side surface of the third lens is concave, convex, or flat, while the image-side surface is convex. The object-side surface of the fourth lens is concave, and the image-side surface is convex. The object-side surface of the fifth lens is either convex or concave, and the image-side surface is convex. The object-side surface of the sixth lens is convex, and the image-side surface is concave. The object-side surface of the seventh lens is convex, and the image-side surface is also convex.

3. The vehicle-mounted optical lens according to claim 1, characterized in that, The sixth lens and the seventh lens are cemented together 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.

4. The vehicle-mounted optical lens according to claim 1, characterized in that, The first lens through 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, and Φ7 are the optical powers of the first lens to the seventh lens, respectively, and Φ is the optical power of the vehicle-mounted optical lens.

5. The vehicle-mounted optical lens according to claim 1, characterized in that, The first through seventh lenses 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, and n7 are the refractive indices of the first lens to the seventh lens, respectively; and v1, v2, v3, v4, v5, v6, and v7 are the Abbe numbers of the first lens to the seventh lens, respectively.

6. The vehicle-mounted optical lens according to claim 1, characterized in that, The vehicle-mounted optical lens satisfies the following condition: 0.4≤f / IC≤1; Where f is the focal length of the vehicle-mounted optical lens, and IC is the image plane diameter of the vehicle-mounted optical lens.

7. The vehicle-mounted optical lens according to claim 1, characterized in that, The vehicle-mounted optical lens meets the following condition: FOV / TTL > 10; Wherein, FOV is the maximum field of view of the vehicle-mounted optical lens, and 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 meets the following condition: f / TTL > 0.12; Where f is the focal length of the vehicle-mounted optical lens, and 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 meets the following condition: 3≤IC / EPD≤3.6; Wherein, IC is the image plane diameter of the vehicle-mounted optical lens, and 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 meets 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 total optical length of the vehicle-mounted optical lens.

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