Low-cost automotive safety assist driving ADAS optical imaging lens
The ADAS lens, with its 6-element optical structure and large aperture design, solves the problems of high cost and insufficient imaging in low-light environments, achieving low-cost, high-definition imaging and improving night vision capabilities and panoramic image support.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI FENGMEI OPTICAL TECH CO LTD
- Filing Date
- 2025-08-04
- Publication Date
- 2026-06-02
AI Technical Summary
Existing ADAS lenses are expensive and have insufficient imaging capabilities in low-light environments, making it difficult to meet consumers' demand for high-definition panoramic images.
It adopts a 6-element optical structure design, including the first lens, second lens, third lens, aperture stop, fourth lens, fifth lens, sixth lens, filter and protective glass in sequence from the first lens to the image plane. It meets the specific focal length, Abbe constant and refractive index relationship, and combines a large aperture design with cemented lenses. The material selection is optimized to reduce costs and improve image quality.
It achieves low-cost, high-definition imaging, features a large aperture design to improve night vision imaging quality, reduces the impact of temperature changes on imaging, optimizes purple fringing, and provides stable panoramic image support.
Smart Images
Figure CN224317843U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of optical systems and vehicle imaging devices, specifically, a low-cost automotive safety assistance driver ADAS optical imaging lens. Background Technology
[0002] With the rapid development of the automotive industry and the surge in vehicle ownership, road safety issues have become prominent, and consumers' demands for driving safety and intelligent features have increased. Advanced Driver Assistance Systems (ADAS) have become a focus of industry technology development. ADAS lens technology relies on traditional optical principles and continuously innovates in lens design. By capturing 360-degree environmental information around the vehicle, it provides panoramic imaging support for parking and driving in narrow roads. The large aperture design effectively improves the lens's imaging capabilities in low-light environments, ensuring clear and usable images whether driving at night or entering dimly lit tunnels, providing reliable data for functions such as lane departure warning and automatic emergency braking.
[0003] However, current ADAS lenses typically use a large number of lenses to ensure lens performance, resulting in higher costs. Utility Model Content
[0004] This invention proposes a low-cost automotive safety assistance driving ADAS optical imaging lens, which features low cost, large aperture, high-definition pixels, no pyrolysis, and purple fringing optimization.
[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a low-cost automotive safety assistance driving ADAS optical imaging lens, which consists of the following components along the optical axis from the object plane to the image plane: a first lens, a second lens, a third lens, an aperture stop, a fourth lens, a fifth lens, a sixth lens, a filter, a protective glass, and an image plane.
[0006] The first lens is concave-convex in shape;
[0007] The second lens is biconvex.
[0008] The third lens is biconcave.
[0009] The fourth lens is concave-convex in shape;
[0010] The fifth lens is biconvex.
[0011] The sixth lens is concave-convex in shape;
[0012] The fifth and sixth lenses form a set of cemented lenses;
[0013] And it satisfies the following relationship:
[0014] 1.1<|f1 / f|<2.0; 0.8<|f2 / f|<1.9; 1.0<|f3 / f|<2.1; 1.5<|f4 / f|<2.5; 2.1<|f5 / f|<3.2; 13.5<|f6 / f|<14.6;
[0015] Where f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, and f is the effective focal length of the entire optical system.
[0016] In some embodiments, the Abbe constant Vd1 of the first lens and the Abbe constant Vd6 of the sixth lens are both greater than 34 and less than 46, the Abbe constant Vd2 of the second lens is greater than 20 and less than 32, the Abbe constant Vd3 of the third lens and the Abbe constant Vd5 of the fifth lens are both greater than 44 and less than 56, and the Abbe constant Vd4 of the fourth lens is greater than 71 and less than 82.
[0017] In some embodiments, the refractive indices of the individual lenses in the optical system satisfy the following condition:
[0018] 1.55<Nd1<1.68; 1.97<Nd2<2.08; 1.63<Nd3<1.74; 1.48<Nd4<1.58; 1.63<Nd5<1.74; 1.76<Nd6<1.88;
[0019] Wherein, Nd1 is the refractive index of the first lens, Nd2 is the refractive index of the second lens, Nd3 is the refractive index of the third lens, Nd4 is the refractive index of the fourth lens, Nd5 is the refractive index of the fifth lens, and Nd6 is the refractive index of the sixth lens.
[0020] In some embodiments, the maximum target surface IH of the optical system satisfies the following condition:
[0021] IH ≥ 7.1 mm.
[0022] In some embodiments, the aperture of the optical system satisfies the following condition:
[0023] F / NO = 1.8.
[0024] In some embodiments, the total length (TTL) of the optical system and the entrance pupil diameter (ENPD) of the optical system satisfy the following condition:
[0025] 7.1≤TTL / ENPD≤8.2.
[0026] In some embodiments, the object plane side of the first lens is convex and the image plane side is concave, and its optical power is negative.
[0027] The second lens has a large convex surface on the object side and a small convex surface on the image side, and its optical power is positive.
[0028] The object plane of the third lens is concave, and the image plane is also concave; its optical power is negative.
[0029] The fourth lens has a concave object plane and a convex image plane, and its optical power is positive.
[0030] The fifth lens has a large convex surface on the object side and a small convex surface on the image side, and its optical power is positive.
[0031] The object side of the sixth lens is concave, and the image side is convex; its optical power is positive.
[0032] In some embodiments, the aperture stop is disposed between the third lens and the fourth lens.
[0033] In summary, this utility model has the following beneficial effects:
[0034] Low cost: This utility model adopts a 6G structure design to replace the traditional 7G structure, which reduces the cost of the product while ensuring lens performance and improving the product's market competitiveness.
[0035] The large aperture design of F / NO=1.8 can increase the amount of light passing through the lens and improve the image quality of the lens in night vision.
[0036] High-resolution pixels: Supports a target surface sensor of ≥7.1mm, meeting the requirements of 1080P high-definition panoramic imaging, which can better provide panoramic imaging support for drivers and optimize the driving experience.
[0037] Thermal non-thermal: It can maintain stable imaging without refocusing in extreme temperature environments, and will not cause problems such as image blurring or distortion due to temperature changes.
[0038] Purple fringing optimization: By appropriately selecting low-dispersion materials within the lens assembly, imaging aberrations and edge chromatic aberrations are reduced, especially the purple fringing phenomenon, thereby improving the image quality of the lens. Attached Figure Description
[0039] Figure 1 A schematic diagram of the optical system provided in an embodiment of this utility model;
[0040] Figure 2 MTF resolution diagram of the optical system provided in the embodiments of this utility model in visible light;
[0041] Figure 3 Defocus curve of the optical system provided in this embodiment of the present invention at 20°C in visible light;
[0042] Figure 4Defocus curve of the optical system provided in this embodiment of the present invention at -40°C in visible light;
[0043] Figure 5 Defocus curve of the optical system provided in this embodiment of the present invention at 105°C in visible light;
[0044] Figure 6 Field curvature diagram of the optical system provided in this embodiment of the utility model;
[0045] Figure 7 F-THETA distortion diagram of the optical system provided in the embodiment of this utility model;
[0046] Figure 8 Standard dot matrix diagram provided for embodiments of this utility model;
[0047] Figure 9 A vertical axis color difference diagram provided for an embodiment of this utility model. Detailed Implementation
[0048] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.
[0049] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0051] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0052] like Figure 1 As shown, this embodiment provides a low-cost automotive safety assistance driving ADAS optical imaging lens, which includes, along the optical axis from the object plane to the image plane, the following components in sequence: a first lens E1, a second lens E2, a third lens E3, an aperture stop STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter IR, a protective glass CG, and an image plane IMA.
[0053] The object plane side S1 of the first lens E1 is convex, and the image plane side S2 is concave.
[0054] The object plane side S3 of the second lens E2 is convex, and the image plane side S4 is convex.
[0055] The object plane side S5 of the third lens E3 is concave, and the image plane side S6 is concave.
[0056] The fourth lens E4 has a concave surface on the object side S8 and a convex surface on the image side S9;
[0057] The object plane side S10 of the fifth lens E5 is convex, and the image plane side S11 is convex.
[0058] The object side of the sixth lens E6 is concave, and the image side S12 is convex.
[0059] The fifth lens E5 and the sixth lens E6 form a set of cemented lenses;
[0060] And it satisfies the following relationship:
[0061] 1.1<|f1 / f|<2.0; 0.8<|f2 / f|<1.9; 1.0<|f3 / f|<2.1; 1.5<|f4 / f|<2.5; 2.1<|f5 / f|<3.2; 13.5<|f6 / f|<14.6;
[0062] Where f1 is the focal length of the first lens E1, f2 is the focal length of the second lens E2, f3 is the focal length of the third lens E3, f4 is the focal length of the fourth lens E4, f5 is the focal length of the fifth lens E5, f6 is the focal length of the sixth lens E6, and f is the effective focal length of the entire optical system. By limiting the ratio of each lens's focal length to the effective focal length of the optical system, the optical path can be effectively converged in a 6-element structure, ensuring lens performance while reducing product costs and improving market competitiveness.
[0063] As improvements, the Abbe constants Vd1 of the first lens E1 and Vd6 of the sixth lens E6 are both greater than 34 and less than 46, employing medium dispersion to achieve a balance between cost and aberration. The Abbe constant Vd2 of the second lens E2 is greater than 20 and less than 32, employing high dispersion to specifically correct chromatic aberration in specific wavelength bands. The Abbe constants Vd3 of the third lens E3 and Vd5 of the fifth lens E5 are both greater than 44 and less than 56, exhibiting low dispersion to suppress broad-spectrum dispersion. The Abbe constant Vd4 of the fourth lens E4 is greater than 71 and less than 82, exhibiting ultra-low dispersion to further eliminate residual chromatic aberration. Through the combination of high-dispersion and low-dispersion materials, especially the cemented design of the fifth lens E5 and the sixth lens E6, purple fringing can be reduced, achieving optimization of purple fringing.
[0064] As an improvement, the refractive indices of each lens in the optical system satisfy the following condition:
[0065] 1.55<Nd1<1.68; 1.97<Nd2<2.08; 1.63<Nd3<1.74; 1.48<Nd4<1.58; 1.63<Nd5<1.74; 1.76<Nd6<1.88;
[0066] Wherein, Nd1 is the refractive index of the first lens E1, Nd2 is the refractive index of the second lens E2, Nd3 is the refractive index of the third lens E3, Nd4 is the refractive index of the fourth lens E4, Nd5 is the refractive index of the fifth lens E5, and Nd6 is the refractive index of the sixth lens E6. By designing the refractive indices of each lens and coordinating them with the thermal expansion coefficients of the materials, the optical path offset under high and low temperatures is ≤1μm, achieving a heat-free lens.
[0067] As an improvement, the maximum target surface IH of the optical system satisfies the following condition:
[0068] With an IH of ≥7.1mm, it can be adapted to 1080P high-definition pixels, ensuring panoramic image details.
[0069] As an improvement, the aperture of the optical system satisfies the following condition:
[0070] With an f / 1.8 aperture, the large aperture design increases the amount of light passing through the lens, improving the quality of night vision imaging.
[0071] As an improvement, the total length (TTL) of the optical system and the entrance pupil diameter (ENPD) of the optical system satisfy the following conditions:
[0072] 7.1≤TTL / ENPD≤8.2. Optical path design that ensures a large aperture within a compact structure.
[0073] As an improvement, the optical power of the first lens E1 is negative. The first lens E1 is the first element of the optical path. The negative optical power can effectively widen the field of view, and when combined with a large aperture, aberration correction can be achieved.
[0074] The second lens E2 has a positive optical power, forming a "negative-positive" combination with the first lens E1, which initially compresses the optical path and compensates for spherical aberration.
[0075] The third lens E3 has a negative optical power, which can be used in conjunction with subsequent lenses to balance distortion and can also be used to prepare for chromatic aberration correction.
[0076] The fourth lens E4 has a positive optical power and can receive the light rays emitted from the aperture ST0, further converging the optical path and correcting coma.
[0077] The optical power of the fifth lens E5 is positive;
[0078] The sixth lens, E6, has a positive optical power; by utilizing the difference in refractive index of different materials, it cancels out dispersion across a wide spectrum, especially in the violet band, thus achieving violet fringing optimization.
[0079] As an improvement, the aperture ST0 is positioned between the third lens E3 and the fourth lens E4, which can control the entrance pupil position and optimize the aberration correction efficiency of subsequent lenses.
[0080] In this patent embodiment, when the working distance is 3m, the total focal length of the optical system (optical lens) is f=5.29mm, the aperture F / NO=1.8, and the maximum target surface IH=7.1mm.
[0081] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.
[0082] The parameters of each lens in this embodiment are listed in Table 1 below.
[0083] Table 1 Physical parameters of each lens
[0084]
[0085] Specifically, in this embodiment, the R-value (radius of curvature), thickness, refractive index, Abbe number (ABB), and focal length (EFL-E) of each lens surface are shown in Table 1. In Table 1, Surf represents the mirror number, INFINITY represents infinity, a positive radius of curvature indicates that the mirror is curved towards the object surface, and a negative radius of curvature indicates that the mirror is curved towards the image surface. Mirror numbers 1 and 2 represent the two mirrors of the first lens E1 along the direction of light incidence, respectively; mirror numbers 3 and 4 represent the two mirrors of the second lens E2 along the direction of light incidence, respectively; mirror numbers 5 and 6 represent the two mirrors of the third lens E3 along the direction of light incidence, respectively; mirror numbers 8 and 9 represent the two mirrors of the fourth lens E4 along the direction of light incidence, respectively; mirror number 10 represents the object-side mirror of the fifth lens E5; mirror number 11 represents the cemented surface of the fifth lens E5 and the sixth lens E6; and mirror number 12 represents the image-side mirror of the sixth lens E6.
[0086] In this embodiment of the utility model, Figure 2 The modulation transfer function (MTF) curve, representing the visible light band, indicates the overall resolving power of an optical system. The horizontal axis represents spatial frequency (lp / mm), and the vertical axis represents the MTF value. The MTF value is used to evaluate the image quality of a lens, ranging from 0 to 1. It is worth noting that the optical transfer function is a relatively accurate, intuitive, and common way to evaluate the image quality of an optical system; a higher and smoother curve indicates better image quality and a stronger ability to reproduce the true image. Figure 2 It can be seen that in the visible light band, at a spatial frequency of 83 lp / mm, the MTF in the imaging region near the center is >0.7, indicating good imaging quality. Figure 3 This is represented as a defocus curve at 20°C in the visible light band. Figure 3 It can be seen that the lens has good MTF concentration, making focusing easy, and the defocus curve trend is consistent across different field of view angles. From Figure 4 and Figure 5 It can be seen that the defocus curves at low temperature -40℃ and high temperature 105℃ both meet the requirements of high resolution, with small focus changes and stable thermal drift effect. Figure 6 Represented as a field curve diagram, by Figure 6 It can be seen that the field curvature value should be controlled between -0.06mm and 0.06mm. The smaller the field curvature value, the better the image quality of the lens. Figure 7 To represent it as an F-THETA distortion map, the smaller the F-THETA distortion, the less the compression at the edges of the image. Figure 8 Represented as a standard point array diagram; Figure 9 This is represented as a vertical axis color difference diagram.
Claims
1. A low-cost automotive safety assistance driver ADAS optical imaging lens, characterized in that: Along the optical axis from the object plane to the image plane, the lenses are arranged as follows: first lens, second lens, third lens, aperture stop, fourth lens, fifth lens, sixth lens, filter, protective glass, and image plane. The first lens is concave-convex in shape; The second lens is biconvex. The third lens is biconcave. The fourth lens is concave-convex in shape; The fifth lens is biconvex. The sixth lens is concave-convex in shape; The fifth and sixth lenses form a set of cemented lenses; And it satisfies the following relationship: 1.1<|f1 / f|<2.0; 0.8<|f2 / f|<1.9; 1.0<|f3 / f|<2.1; 1.5<|f4 / f|<2.5; 2.1<|f5 / f|<3.2; 13.5<|f6 / f|<14.6; Where f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, and f is the effective focal length of the entire optical system.
2. The low-cost automotive safety assistance driver ADAS optical imaging lens according to claim 1, characterized in that: The Abbe constants Vd1 of the first lens and Vd6 of the sixth lens are both greater than 34 and less than 46. The Abbe constant Vd2 of the second lens is greater than 20 and less than 32. The Abbe constants Vd3 of the third lens and Vd5 of the fifth lens are both greater than 44 and less than 56. The Abbe constant Vd4 of the fourth lens is greater than 71 and less than 82.
3. The low-cost automotive safety assistance driver ADAS optical imaging lens according to claim 1, characterized in that: The refractive indices of all lenses in the optical system satisfy the following condition: 1.55<Nd1<1.68; 1.97<Nd2<2.08; 1.63<Nd3<1.74; 1.48<Nd4<1.58; 1.63<Nd5<1.74; 1.76<Nd6<1.88; Wherein, Nd1 is the refractive index of the first lens, Nd2 is the refractive index of the second lens, Nd3 is the refractive index of the third lens, Nd4 is the refractive index of the fourth lens, Nd5 is the refractive index of the fifth lens, and Nd6 is the refractive index of the sixth lens.
4. The low-cost automotive safety assistance driver ADAS optical imaging lens according to claim 1, characterized in that: The maximum image height IH of the optical system satisfies the following condition: IH ≥ 7.1 mm.
5. The low-cost automotive safety assistance driver ADAS optical imaging lens according to claim 1, characterized in that: The aperture of the optical system satisfies the following condition: F / NO = 1.
8.
6. The low-cost automotive safety assistance driver ADAS optical imaging lens according to claim 1, characterized in that: The total length (TTL) of the optical system and the entrance pupil diameter (ENPD) of the optical system satisfy the following conditions: 7.1≤TTL / ENPD≤8.
2.
7. The low-cost automotive safety assistance driver ADAS optical imaging lens according to claim 1, characterized in that: The object side of the first lens is convex, and the image side is concave; its optical power is negative. The second lens has a large convex surface on the object side and a small convex surface on the image side, and its optical power is positive. The object plane of the third lens is concave, and the image plane is also concave; its optical power is negative. The fourth lens has a concave object plane and a convex image plane, and its optical power is positive. The fifth lens has a large convex surface on the object side and a small convex surface on the image side, and its optical power is positive. The object side of the sixth lens is concave, and the image side is convex; its optical power is positive.
8. The low-cost automotive safety assistance driver ADAS optical imaging lens according to claim 1, characterized in that: The aperture stop is positioned between the third lens and the fourth lens.