A vehicle-mounted optical lens
By combining five glass spherical lenses and one glass aspherical lens, the problem of large size and high cost of automotive lenses is solved, achieving miniaturization and high-quality imaging, and adapting to the high-temperature environment of ADAS systems.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- ZHONGSHAN UNITED AUTOMOBILE TECH CO LTD
- Filing Date
- 2023-01-30
- Publication Date
- 2026-06-09
Smart Images
Figure CN115980981B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of optical imaging technology, and in particular to a vehicle-mounted optical lens. Background Technology
[0002] With the rapid development and widespread application of intelligent safety-assisted driving monitoring systems, the requirements for ADAS are constantly increasing. Today's ADAS is constantly developing towards miniaturization and strong temperature adaptability. Accordingly, there is an urgent need to research and develop new architecture ADAS lenses for large-angle close-range shooting. All existing large-angle automotive lenses on the market use glass aspherical structures, and the number of them is more than two. Such automotive lenses have the disadvantages of large size, heavy weight and high cost. Therefore, there is an urgent need for an automotive optical lens to solve the above problems. Summary of the Invention
[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes an automotive optical lens.
[0004] One embodiment of the present invention provides a technical solution to solve its technical problem as follows: a vehicle-mounted optical lens, which is provided sequentially along the light incident direction with a first lens L1, a second lens L2, a third lens L3, an aperture stop, a fourth lens L4, a fifth lens L5, a sixth lens L6, a filter L7, a protective glass L8, and an image plane; wherein, the fourth lens L4 and the fifth lens L5 are cemented together, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 are glass spherical lenses, and the sixth lens L6 is a glass aspherical lens.
[0005] Preferably, the first lens L1 has negative optical power, and its object side S1 is concave and its image side S2 is concave.
[0006] The second lens L2 has negative optical power, its object side S3 is concave, and its image side S4 is convex.
[0007] The third lens L3 has positive optical power, and its object side S5 is convex, and its image side S6 is convex.
[0008] The fourth lens L4 has positive optical power, and its object side S8 is convex, and its image side S9 is convex.
[0009] The fifth lens L5 has negative optical power, its object side S10 is concave, and its image side S11 is either concave or convex.
[0010] The sixth lens L6 has positive optical power, and its object side S12 is convex, and its image side S13 is convex.
[0011] Preferably, the first lens L1 satisfies Nd1≤1.60 and Vd1≥60, where Nd1 is the refractive index of the first lens L1 and Vd1 is the Abbe constant of the first lens L1;
[0012] The second lens L2 satisfies Nd2≤1.75 and Vd2≤60, where Nd2 is the refractive index of the second lens L2 and Vd2 is the Abbe constant of the second lens L2.
[0013] The third lens L3 satisfies Nd3≤1.8 and Vd3≥40, where Nd3 is the refractive index of the third lens L3 and Vd3 is the Abbe constant of the third lens L3.
[0014] The fourth lens L4 satisfies Nd4≤1.6 and Vd4≥70, where Nd4 is the refractive index of the fourth lens L4 and Vd4 is the Abbe constant of the fourth lens L4.
[0015] The fifth lens L5 satisfies Nd5≤2.0 and Vd5≤30, where Nd5 is the refractive index of the fifth lens L5 and Vd5 is the Abbe constant of the fifth lens L5.
[0016] The sixth lens L6 satisfies Nd6≤1.85 and Vd6≤65, where Nd6 is the refractive index of the sixth lens L6 and Vd6 is the Abbe constant of the sixth lens L6.
[0017] Preferably, the optical lens satisfies the condition BFL / TTL > 0.3, where BFL is the distance on the optical axis from the center of the image side surface S13 of the sixth lens L6 to the imaging surface of the optical lens; and TTL is the distance on the optical axis from the center of the object side surface S1 of the first lens L1 to the imaging surface of the optical lens.
[0018] Preferably, the optical lens satisfies the condition 67.5≤(FOV×f) / h≤69, where FOV is the maximum field of view of the lens, f is the focal length of the lens group, and h is the image height corresponding to the maximum field of view.
[0019] The beneficial effects of this invention are as follows: A vehicle-mounted optical lens, arranged sequentially along the light incident direction, comprises a first lens L1, a second lens L2, a third lens L3, an aperture stop, a fourth lens L4, a fifth lens L5, a sixth lens L6, a filter L7, a protective glass L8, and an image plane; wherein, the fourth lens L4 and the fifth lens L5 are cemented together, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 are spherical glass lenses, and the sixth lens L6 is an aspherical glass lens; by using five spherical glass lenses and one aspherical glass lens, the performance requirements of wide angle, distortion, chromatic aberration, and high and low temperature operation are met. By combining reasonable optical power and surface shape, and rationally allocating parameters, the lens achieves miniaturization, low cost, high-quality imaging, and a wide angle, providing a wider field of view than current ADAS lenses. Attached Figure Description
[0020] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:
[0021] Figure 1 This is a schematic diagram of the structure of a vehicle-mounted optical lens;
[0022] Figure 2 This is a distortion curve diagram of a vehicle-mounted optical lens;
[0023] Figure 3 This is an MTF curve of a vehicle-mounted optical lens. Detailed Implementation
[0024] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.
[0025] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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 limiting this invention.
[0026] In this invention, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to a fixed connection, a detachable connection, or an integrally formed connection; they can refer to a mechanical connection; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.
[0027] Reference Figures 1 to 3 A vehicle-mounted optical lens, comprising, in sequence along the light incident direction, a first lens L1, a second lens L2, a third lens L3, an aperture stop, a fourth lens L4, a fifth lens L5, a sixth lens L6, a filter L7, a protective glass L8, and an image plane; wherein, the fourth lens L4 and the fifth lens L5 are cemented together, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 are spherical glass lenses, and the sixth lens L6 is an aspherical glass lens.
[0028] Reference Figure 1 This invention provides an automotive optical lens, which, along the light incident direction, is sequentially provided with a first lens L1, a second lens L2, a third lens L3, an aperture stop, a fourth lens L4, a fifth lens L5, a sixth lens L6, a filter L7, a protective glass L8, and an image plane; wherein, the first lens L1, the second lens L2, the third lens L3, the aperture stop, the fourth lens L4, and the fifth lens L5 are spherical glass lenses, and the sixth lens L6 is an aspherical glass lens, wherein:
[0029] The first lens L1 has negative optical power, and its object side S1 is concave and its image side S2 is concave.
[0030] The second lens L2 has negative optical power, its object side S3 is concave, and its image side S4 is convex.
[0031] The third lens L3 has positive optical power, and its object side S5 is convex, and its image side S6 is convex.
[0032] The fourth lens L4 has positive optical power, and its object side S8 is convex, and its image side S9 is convex.
[0033] The fifth lens L5 has negative optical power, its object side S10 is concave, and its image side S11 is convex.
[0034] The sixth lens L6 has positive optical power, and its object side S12 is convex, and its image side S13 is convex.
[0035] The optical parameters of the provided optical lens are shown in Table 1(a).
[0036] Table 1(a)
[0037]
[0038] Table 1(a) shows that the first lens L1 satisfies Nd1≤1.60 and Vd1≥60, where Nd1 is the refractive index of the first lens L1 and Vd1 is the Abbe constant of the first lens L1.
[0039] The second lens L2 satisfies Nd2≤1.75 and Vd2≤60, where Nd2 is the refractive index of the second lens L2 and Vd2 is the Abbe constant of the second lens L2.
[0040] The third lens L3 satisfies Nd3≤1.8 and Vd3≥40, where Nd3 is the refractive index of the third lens L3 and Vd3 is the Abbe constant of the third lens L3.
[0041] The fourth lens L4 satisfies Nd4≤1.6 and Vd4≥70, where Nd4 is the refractive index of the fourth lens L4 and Vd4 is the Abbe constant of the fourth lens L4.
[0042] The fifth lens L5 satisfies Nd5≤2.0 and Vd5≤30, where Nd5 is the refractive index of the fifth lens L5 and Vd5 is the Abbe constant of the fifth lens L5.
[0043] The sixth lens L6 satisfies Nd6≤1.85 and Vd6≤65, where Nd6 is the refractive index of the sixth lens L6 and Vd6 is the Abbe constant of the sixth lens L6.
[0044] The radius of curvature of the surfaces of the aperture, filter L7, and protective glass L8 is Infinity, indicating that these surfaces are planar.
[0045] The optical lens meets the following conditions:
[0046] 1. BFL / TTL > 0.3, where BFL is the distance on the optical axis from the center of the image side surface S13 of the sixth lens L6 to the imaging surface of the optical lens; TTL is the distance on the optical axis from the center of the object side surface S1 of the first lens L1 to the imaging surface of the optical lens.
[0047] 2. The optical lens meets the condition 67.5≤(FOV×f) / h≤69, where FOV is the maximum field of view of the lens, f is the focal length of the lens group, and h is the image height corresponding to the maximum field of view; this helps to reduce lens distortion.
[0048] Table 1(b)
[0049]
[0050] Table 1(b) shows a design value for the aspherical coefficient of the lens in the optical lens of the first embodiment. The specific value can be adjusted according to product requirements and is not a limitation on the embodiments of the present invention.
[0051] Reference Figure 2-3 These are the distortion curve diagram and the MTF curve diagram of the present invention, respectively.
[0052] This invention uses one glass aspherical lens in addition to five glass spherical lenses to meet the performance requirements of wide angle, distortion, chromatic aberration, and high and low temperature operation. This reduces the number of glass aspherical lenses in the lens, making the lens more compact, lower in cost, and more competitive. Furthermore, by combining appropriate optical power and surface shape, and rationally allocating parameters, the lens combines the advantages of miniaturization and low cost, while achieving high-quality imaging and a wide angle, providing a wider field of view than current ADAS lenses.
[0053] Of course, the present invention is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications and substitutions are included within the scope defined by the claims of this application.
Claims
1. A vehicle-mounted optical lens, characterized in that: It is composed of a first lens L1, a second lens L2, a third lens L3, an aperture stop, a fourth lens L4, a fifth lens L5, a sixth lens L6, a filter L7, a protective glass L8, and an image plane arranged sequentially along the incident direction of light; wherein, the fourth lens L4 and the fifth lens L5 are cemented together, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 are spherical glass lenses, and the sixth lens L6 is an aspherical glass lens; The vehicle-mounted optical lens meets the following conditions: 。