Small low-distortion vehicle-mounted lens

Abstract

The invention discloses a small low-distortion vehicle-mounted lens, and belongs to the technical field of optical lenses. Comprising a first lens with positive focal power, a second lens with positive focal power, a diaphragm, a third lens with negative focal power, a fourth lens with positive focal power, a fifth lens with positive focal power and a sixth lens with positive focal power which are sequentially arranged from an object plane to an image plane along an optical axis, and the following conditions are met: 0.3 lt; f / TTLlt; 0.4, 4.95 < = TTL / D < = 5.55; wherein f is the focal length of the small low-distortion vehicle-mounted lens, TTL is the total length of the small low-distortion vehicle-mounted lens, D is the entrance pupil diameter, and the unit is mm. The vehicle-mounted lens has the advantages of small size, low distortion, large aperture, high imaging quality and low cost, and is good in working stability in high and low temperature environments.

Description

Technical Field

[0001] This invention belongs to the field of optical lens technology, specifically relating to a small, low-distortion automotive lens. Background Technology

[0002] As the automotive industry matures, automotive lenses, as core components of vehicle environmental perception, directly impact driving safety and user experience, leading to increasingly stringent requirements. On one hand, traditional automotive lenses generally suffer from high distortion rates and significant geometric distortion at image edges. This reduces the accuracy of the driving system in recognizing road signs, pedestrians, and other targets, especially in rainy, foggy, or nighttime environments where noise and low contrast further degrade target recognition accuracy. On the other hand, traditional automotive lenses are prone to thermal expansion and contraction in high and low temperature environments, causing lens component deformation and resulting in focus shift (focus drift). This severely affects imaging stability, particularly during long-distance driving or in adverse weather conditions, reducing driving safety and user experience. Furthermore, traditional automotive lenses are generally large, often constructed entirely of glass, hindering mass production and integration into modular automotive components, failing to meet the requirements of modern miniaturized parts. Therefore, this paper proposes a small, low-distortion automotive lens. Summary of the Invention

[0003] The purpose of this invention is to address the above-mentioned problems by proposing a small, low-distortion vehicle-mounted lens that has the advantages of small size, low distortion, large aperture, high image quality, and low cost, and also has good working stability in high and low temperature environments.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] The present invention proposes a small, low-distortion automotive lens, comprising a first lens with positive optical power, a second lens with positive optical power, an aperture stop, a third lens with negative optical power, a fourth lens with positive optical power, a fifth lens with positive optical power, and a sixth lens with positive optical power, arranged sequentially along the optical axis from the object plane to the image plane, and satisfying the following conditions:

[0006] 0.3 <f / TTL<0.4,4.95≤TTL / D≤5.55;

[0007] Where f is the focal length of the small low-distortion automotive lens, TTL is the total length of the small low-distortion automotive lens, and D is the entrance pupil diameter, all in mm.

[0008] Preferably, the small, low-distortion vehicle-mounted lens also meets the following conditions:

[0009] 10≤f1 / f≤10.3, 1≤f2 / f≤1.2, -1.3≤f3 / f≤-1.1,

[0010] 12.3≤f4 / f≤12.5, 1.4≤f5 / f≤1.6, 5.15≤f6 / f≤5.3;

[0011] Where f1, f2, f3, f4, f5, and f6 are the focal lengths of the first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens, respectively, in mm.

[0012] Preferably, the small, low-distortion vehicle-mounted lens also meets the following conditions:

[0013] 10.5≤f / d1≤11.5, 6.75≤f / d2≤6.85, 8.3≤f / d3≤8.45

[0014] 3.5≤f / d4≤3.65, 2.65≤f / d5≤2.78, 5.2≤f / d6≤5.35;

[0015] Wherein, d1, d2, d3, d4, d5, and d6 are the thicknesses of the first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens, respectively, in mm.

[0016] Preferably, the small, low-distortion vehicle-mounted lens also meets the following conditions:

[0017] 0.3≤d1≤0.5, 0.6≤d2≤0.8, 0.5≤d3≤0.75,

[0018] 1.3≤d4≤1.45, 1.75≤d5≤1.9, 0.85≤d6≤1;

[0019] Wherein, d1, d2, d3, d4, d5, and d6 are the thicknesses of the first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens, respectively, in mm.

[0020] Preferably, the small, low-distortion vehicle-mounted lens also meets the following conditions:

[0021] 2.3≤D1≤2.5, 1.6≤D2≤1.8, 0.4≤D3≤0.6, 0.9≤D4≤1.1;

[0022] Where D1 is the air gap between the first and second lenses, D2 is the air gap between the second and third lenses, D3 is the air gap between the fourth and fifth lenses, and D4 is the air gap between the fifth and sixth lenses, all in mm.

[0023] Preferably, the third and fourth lenses are cemented lenses.

[0024] Preferably, the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are all glass spherical lenses, and the sixth lens is a plastic aspherical lens.

[0025] Preferably, the object-side mirror surface of the first lens is convex, and the image-side mirror surface is concave.

[0026] The object-side mirror of the second lens is convex, and the image-side mirror is concave.

[0027] The object-side mirror of the third lens is concave, and the image-side mirror is also concave.

[0028] The object-side mirror of the fourth lens is convex, and the image-side mirror is also convex.

[0029] The object-side mirror of the fifth lens is convex, and the image-side mirror is also convex.

[0030] The object-side mirror of the sixth lens is concave, and the image-side mirror is convex.

[0031] Preferably, the small, low-distortion vehicle-mounted lens also meets the following conditions:

[0032] 25≤R11≤27, 4≤R21≤6, -4.9≤R31≤-4.7,

[0033] 4.2≤R41≤4.4, 6.6≤R51≤6.7, 13≤R61≤15;

[0034] 4≤R12≤5, 55≤R22≤58, 4.2≤R32≤4.4,

[0035] -7.3≤R42≤-7.2,-70≤R52≤-69,4≤R62≤5.5;

[0036] Wherein, R11, R21, R31, R41, R51, and R61 are the object-side radii of curvature of the first, second, third, fourth, fifth, and sixth lenses, respectively, and R12, R22, R32, R42, R52, and R62 are the image-side radii of curvature of the first, second, third, fourth, fifth, and sixth lenses, respectively, in mm.

[0037] Preferably, the small, low-distortion vehicle-mounted lens also meets the following conditions:

[0038] 1.51≤nd1≤1.71, 1.71≤nd2≤2.0, 1.71≤nd3≤1.90,

[0039] 1.73≤nd4≤1.90, 1.70≤nd5≤1.90, 1.51≤nd6≤1.66;

[0040] 45≤vd1≤55, 30≤vd2≤35, 20≤vd3≤25

[0041] 35≤vd4≤45, 40≤vd5≤45, 55≤vd6≤60;

[0042] Wherein, nd1, nd2, nd3, nd4, nd5, and nd6 are the refractive indices of the first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens, respectively, and vd1, vd2, vd3, vd4, vd5, and vd6 are the Abbe numbers of the first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens, respectively.

[0043] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0044] This automotive lens achieves a more compact and efficient structure by rationally setting the positive and negative optical power of the lens and limiting the proportional relationship between the focal length and total length, as well as between the total length and entrance pupil diameter, of the small, low-distortion automotive lens. It features low distortion, a large aperture, high resolution, and strong environmental adaptability. It can maintain stable performance in high and low temperature environments ranging from -40°C to +60°C, and is less prone to focus drift. This helps improve driving safety, broaden the driver's field of vision, and meet the miniaturization requirements of modern automobiles for automotive lenses. Specifically, by rationally setting the aperture position and lens spacing, image quality can be improved and miniaturization can be achieved; by rationally setting the refractive index and Abbe number of each lens, the stability and color reproduction of the automotive lens under different lighting conditions are ensured; the 5G1P structure, which is a combination of five glass spherical lenses and one plastic aspherical lens, reduces manufacturing costs and improves production efficiency by introducing the plastic aspherical lens; by cementing the third and fourth lenses, the structural stability of the automotive lens is effectively enhanced, assembly errors are reduced, and it helps to further correct aberrations such as spherical aberration and coma, thereby improving image quality. The automotive lens has an aperture of F≤2, a field of view of about 75°, a total length of less than 13.75mm, and distortion of less than 15%, making it particularly suitable for automotive front-view and surround-view scenarios with stringent requirements for stability and resolution. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the structure of the small, low-distortion vehicle-mounted lens of the present invention;

[0046] Figure 2 This is the MTF diagram of Embodiment 1 of the present invention;

[0047] Figure 3 This is a field distortion diagram of Embodiment 1 of the present invention;

[0048] Figure 4 This is a relative illumination curve diagram of Embodiment 1 of the present invention;

[0049] Figure 5 This is a dot diagram of Embodiment 1 of the present invention;

[0050] Figure 6 This is a defocusing curve of Embodiment 1 of the present invention at +25°C;

[0051] Figure 7 This is a defocusing curve of Embodiment 1 of the present invention at -40°C;

[0052] Figure 8 This is a defocusing curve of Embodiment 1 of the present invention at +60°C.

[0053] Explanation of reference numerals in the attached diagram: G1, first lens; G2, second lens; STO, aperture stop; G3, third lens; G4, fourth lens; G5, fifth lens; P6, sixth lens; E7, protective glass; IMA, image plane. Detailed Implementation

[0054] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0055] It should be noted that, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application.

[0056] like Figures 1-8 As shown, a small, low-distortion vehicle-mounted lens includes a first lens with positive optical power, a second lens with positive optical power, an aperture stop, a third lens with negative optical power, a fourth lens with positive optical power, a fifth lens with positive optical power, and a sixth lens with positive optical power, arranged sequentially along the optical axis from the object plane to the image plane, and satisfying the following conditions:

[0057] 0.3 <f / TTL<0.4,4.95≤TTL / D≤5.55;

[0058] Where f is the focal length of the small low-distortion automotive lens, TTL is the total length of the small low-distortion automotive lens, and D is the entrance pupil diameter, all in mm.

[0059] Among them, by reasonably setting the combination of positive and negative optical powers and the position of the aperture, and combining the conditional expressions: 0.3 < f / TTL < 0.4, 4.95 ≤ TTL / D ≤ 5.55, the entire lens structure is made more compact and small, meeting the miniaturization requirements of modern automobiles for the volume of on-vehicle lenses, and having low distortion, large aperture and high resolution, achieving high imaging quality, strong environmental adaptability (good stability under high and low temperature conditions) and compact structure design, especially suitable for on-vehicle forward view, surround view and other scenarios with strict requirements for stability and resolution.

[0060] In one embodiment, the small low-distortion on-vehicle lens also satisfies the following conditions:

[0061] 10 ≤ f1 / f ≤ 10.3, 1 ≤ f2 / f ≤ 1.2, -1.3 ≤ f3 / f ≤ -1.1,

[0062] 12.3 ≤ f4 / f ≤ 12.5, 1.4 ≤ f5 / f ≤ 1.6, 5.15 ≤ f6 / f ≤ 5.3;

[0063] Among them, f1, f2, f3, f4, f5, and f6 are the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens in sequence, with the unit of mm.

[0064] In one embodiment, the small low-distortion on-vehicle lens also satisfies the following conditions:

[0065] 10.5 ≤ f / d1 ≤ 11.5, 6.75 ≤ f / d2 ≤ 6.85, 8.3 ≤ f / d3 ≤ 8.45,

[0066] 3.5 ≤ f / d4 ≤ 3.65, 2.65 ≤ f / d5 ≤ 2.78, 5.2 ≤ f / d6 ≤ 5.35;

[0067] Among them, d1, d2, d3, d4, d5, and d6 are the thicknesses of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens in sequence, with the unit of mm.

[0068] In one embodiment, the small low-distortion on-vehicle lens also satisfies the following conditions:

[0069] 0.3 ≤ d1 ≤ 0.5, 0.6 ≤ d2 ≤ 0.8, 0.5 ≤ d3 ≤ 0.75,

[0070] 1.3 ≤ d4 ≤ 1.45, 1.75 ≤ d5 ≤ 1.9, 0.85 ≤ d6 ≤ 1;

[0071] Among them, d1, d2, d3, d4, d5, and d6 are the thicknesses of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens in sequence, with the unit of mm.

[0072] In one embodiment, the small, low-distortion vehicle-mounted lens also satisfies the following condition:

[0073] 2.3≤D1≤2.5, 1.6≤D2≤1.8, 0.4≤D3≤0.6, 0.9≤D4≤1.1;

[0074] Where D1 is the air gap between the first and second lenses, D2 is the air gap between the second and third lenses, D3 is the air gap between the fourth and fifth lenses, and D4 is the air gap between the fifth and sixth lenses, all in mm.

[0075] In one embodiment, the third and fourth lenses are cemented lenses.

[0076] By cementing the third and fourth lenses together, the assembly gap between the lenses is effectively eliminated, the risk of optical shift under vibration is reduced, the structural stability of the vehicle lens is enhanced, the relative position between the lenses is more accurate, assembly errors are reduced, image quality is improved, and it also helps to further correct aberrations such as spherical aberration and coma.

[0077] In one embodiment, the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are all glass spherical lenses, and the sixth lens is a plastic aspherical lens.

[0078] The automotive lens preferably uses a 5G1P structure, which helps reduce costs. The sixth lens is a plastic aspherical lens, which improves the structural stability of the lens and further helps correct aberrations (spherical aberration, coma, etc.), thus improving image quality. Specifically, monochromatic aberrations are offset by a combination of glass with different refractive indices. Especially when the third and fourth lenses form a cemented lens, the plastic aspherical lens compensates for off-axis aberrations through continuous surface changes. The synergistic effect of both significantly reduces the impact of aberrations on imaging, thereby improving the image sharpness and color reproduction of the automotive lens across the entire field of view.

[0079] In one embodiment, the object-side mirror surface of the first lens is convex, and the image-side mirror surface is concave.

[0080] The object-side mirror of the second lens is convex, and the image-side mirror is concave.

[0081] The object-side mirror of the third lens is concave, and the image-side mirror is also concave.

[0082] The object-side mirror of the fourth lens is convex, and the image-side mirror is also convex.

[0083] The object-side mirror of the fifth lens is convex, and the image-side mirror is also convex.

[0084] The object-side mirror of the sixth lens is concave, and the image-side mirror is convex.

[0085] In one embodiment, the small, low-distortion vehicle-mounted lens also satisfies the following condition:

[0086] 25≤R11≤27, 4≤R21≤6, -4.9≤R31≤-4.7,

[0087] 4.2≤R41≤4.4, 6.6≤R51≤6.7, 13≤R61≤15;

[0088] 4≤R12≤5, 55≤R22≤58, 4.2≤R32≤4.4,

[0089] -7.3≤R42≤-7.2,-70≤R52≤-69,4≤R62≤5.5;

[0090] Wherein, R11, R21, R31, R41, R51, and R61 are the object-side radii of curvature of the first, second, third, fourth, fifth, and sixth lenses, respectively, and R12, R22, R32, R42, R52, and R62 are the image-side radii of curvature of the first, second, third, fourth, fifth, and sixth lenses, respectively, in mm.

[0091] In one embodiment, the small, low-distortion vehicle-mounted lens also satisfies the following condition:

[0092] 1.51≤nd1≤1.71, 1.71≤nd2≤2.0, 1.71≤nd3≤1.90,

[0093] 1.73≤nd4≤1.90, 1.70≤nd5≤1.90, 1.51≤nd6≤1.66;

[0094] 45≤vd1≤55, 30≤vd2≤35, 20≤vd3≤25

[0095] 35≤vd4≤45, 40≤vd5≤45, 55≤vd6≤60;

[0096] Wherein, nd1, nd2, nd3, nd4, nd5, and nd6 are the refractive indices of the first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens, respectively, and vd1, vd2, vd3, vd4, vd5, and vd6 are the Abbe numbers of the first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens, respectively.

[0097] The preferred materials for the first lens are H-KF6, the second lens is H-ZLAF89L, the third lens is H-ZF71, the fourth lens is H-ZLAF73, the fifth lens is H-ZLAF55D, and the sixth lens is F4520. Specific material selection can be adjusted according to actual needs. Lens selection is highly flexible and not limited to fixed lens models. In actual production and application, as long as the newly selected lens has the same material as the original lens and the key optical performance parameters (refractive index and Abbe number) remain consistent, different lens models can be effectively replaced.

[0098] For ease of understanding, the present invention and its beneficial effects will be further described in detail below through specific embodiments. However, the specific embodiments of the present invention are not limited thereto.

[0099] Example 1:

[0100] like Figure 1 As shown, this embodiment of a small, low-distortion automotive lens includes, sequentially arranged along the optical axis from the object plane to the image plane, a first lens G1 with positive optical power, a second lens G2 with positive optical power, an aperture stop STO, a third lens G3 with negative optical power, a fourth lens G4 with positive optical power, a fifth lens G5 with positive optical power, a sixth lens P6 with positive optical power, and a protective glass E7. The protective glass E7 is located between the sixth lens P6 and the image plane IMA, serving as the final physical protective layer to prevent external contaminants such as dust, moisture, and oil from entering the automotive lens. This improves the durability and lifespan of the automotive lens and reduces maintenance costs. This embodiment is a 5G1P automotive lens with F≤2, FOV=75°, TTL=13.715mm, and f=4.98mm, where F is the aperture number and FOV is the field of view of the small, low-distortion automotive lens.

[0101] The optical parameters of this embodiment are shown in Table 1 and Table 2.

[0102] Table 1

[0103]

[0104] In Table 1, surfaces numbered 1, 3, 6, 7, 9, 11, and 13 are, in order, the object-side mirrors of the first lens G1, the second lens G2, the third lens G3, the fourth lens G4, the fifth lens G5, the sixth lens P6, and the protective glass E7; surfaces numbered 2, 4, 7, 8, 10, 12, and 14 are, in order, the image-side mirrors of the first lens G1, the second lens G2, the third lens G3, the fourth lens G4, the fifth lens G5, the sixth lens P6, and the protective glass E7; surface number 7 is the cemented surface; STO is the aperture stop; IMA is the image plane; and INF represents infinity, i.e., a plane.

[0105] The aspherical surface in this embodiment is an even-order aspherical surface, which satisfies the following formula.

[0106]

[0107] in, This corresponds to the sag of the mirror along the optical axis. It is the radial distance from the optical axis. For curvature ( =1 / R, where R is the radius of curvature). The conic coefficient, , , , For even-order aspherical higher-order terms, are the coefficients.

[0108] The aspherical coefficients are shown in Table 2.

[0109] Table 2

[0110]

[0111] Based on the above data, refer to Figures 2-8 , Figure 2 This indicates that at a spatial frequency of 100 lp / mm, the field of view of both the meridional MTF and the sagittal MTF can reach above 0.5, demonstrating good image quality. Figure 3 This indicates that the field curvature in each field of view is controlled within 0.05, and the distortion is controlled within 15%. Figure 4 This indicates that the relative illuminance reaches above 0.7 in all fields of view, demonstrating good light transmission performance. Figure 5 This indicates that the size of the blur spot meets the requirements, the aberration correction effect is good, and the image quality is good. Figure 6 The defocus curves are shown at room temperature (+25℃), using five wavelengths: 436nm, 486nm, 546nm, 586nm, and 656nm. The defocus curves illustrate the relationship between the meridional MTF and sagittal MTF and the defocus amount. Defocus represents the lens's tolerance redundancy. In this embodiment, the MTF frequency is 100 lp / mm. Figure 6As can be seen, the focal planes of each field of view are basically the same, and the image quality is uniform and clear. Figure 7 This indicates the defocus curve at -40℃ and Figure 6 There is no significant difference in the defocus curve at room temperature compared to the previous curve; the image quality is uniform and clear with no obvious defocus. Figure 8 The defocus curve at +60℃ is shown in the diagram. Figure 6 There is no significant difference in the defocus curve at room temperature. The image quality is uniform and clear with no obvious defocus. There is no obvious focus shift when there are large differences in high and low temperatures.

[0112] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0113] The embodiments described above are merely specific and detailed examples of the embodiments described in this application, and should not be construed as limiting the scope of the application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the appended claims.

Claims

1. A small, low-distortion vehicle-mounted lens, characterized in that: It includes a first lens with positive optical power, a second lens with positive optical power, an aperture stop, a third lens with negative optical power, a fourth lens with positive optical power, a fifth lens with positive optical power, and a sixth lens with positive optical power, arranged sequentially along the optical axis from the object plane to the image plane, and satisfies the following condition: 0.3 <f / TTL<0.4,4.95≤TTL / D≤5.55; Where f is the focal length of the small low-distortion vehicle lens, TTL is the total length of the small low-distortion vehicle lens, and D is the entrance pupil diameter, all in mm.

2. The small, low-distortion vehicle-mounted lens as described in claim 1, characterized in that: The small, low-distortion vehicle-mounted lens also meets the following conditions: 10≤f1 / f≤10.3, 1≤f2 / f≤1.2, -1.3≤f3 / f≤-1.1, 12.3≤f4 / f≤12.5, 1.4≤f5 / f≤1.6, 5.15≤f6 / f≤5.3; Where f1, f2, f3, f4, f5, and f6 are the focal lengths of the first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens, respectively, in mm.

3. The small, low-distortion vehicle-mounted lens as described in claim 1, characterized in that: The small, low-distortion vehicle-mounted lens also meets the following conditions: 10.5≤f / d1≤11.5, 6.75≤f / d2≤6.85, 8.3≤f / d3≤8.45 3.5≤f / d4≤3.65, 2.65≤f / d5≤2.78, 5.2≤f / d6≤5.35; Wherein, d1, d2, d3, d4, d5, and d6 are the thicknesses of the first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens, respectively, in mm.

4. The small, low-distortion vehicle-mounted lens as described in claim 1, characterized in that: The small, low-distortion vehicle-mounted lens also meets the following conditions: 0.3≤d1≤0.5, 0.6≤d2≤0.8, 0.5≤d3≤0.75, 1.3≤d4≤1.45, 1.75≤d5≤1.9, 0.85≤d6≤1; Wherein, d1, d2, d3, d4, d5, and d6 are the thicknesses of the first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens, respectively, in mm.

5. The small, low-distortion vehicle-mounted lens as described in claim 1, characterized in that: The small, low-distortion vehicle-mounted lens also meets the following conditions: 2.3≤D1≤2.5, 1.6≤D2≤1.8, 0.4≤D3≤0.6, 0.9≤D4≤1.1; Wherein, D1 is the air gap between the first lens and the second lens, D2 is the air gap between the second lens and the third lens, D3 is the air gap between the fourth lens and the fifth lens, and D4 is the air gap between the fifth lens and the sixth lens, in mm.

6. The small, low-distortion vehicle-mounted lens as described in claim 1, characterized in that: The third and fourth lenses are cemented lenses.

7. The small, low-distortion vehicle-mounted lens as described in claim 1, characterized in that: The first lens, the second lens, the third lens, the fourth lens, and the fifth lens are all glass spherical lenses, and the sixth lens is a plastic aspherical lens.

8. The small, low-distortion vehicle-mounted lens as described in claim 1, characterized in that: The object-side mirror surface of the first lens is convex, and the image-side mirror surface is concave. The object-side mirror of the second lens is convex, and the image-side mirror is concave. The object-side mirror surface of the third lens is concave, and the image-side mirror surface is also concave. The object-side mirror surface of the fourth lens is convex, and the image-side mirror surface is also convex. The object-side mirror surface of the fifth lens is convex, and the image-side mirror surface is convex. The object-side mirror of the sixth lens is concave, and the image-side mirror is convex.

9. The small, low-distortion vehicle-mounted lens as described in claim 1, characterized in that: The small, low-distortion vehicle-mounted lens also meets the following conditions: 25≤R11≤27, 4≤R21≤6, -4.9≤R31≤-4.7, 4.2≤R41≤4.4, 6.6≤R51≤6.7, 13≤R61≤15; 4≤R12≤5, 55≤R22≤58, 4.2≤R32≤4.4, -7.3≤R42≤-7.2,-70≤R52≤-69,4≤R62≤5.5; Wherein, R11, R21, R31, R41, R51, and R61 are the object-side radii of curvature of the first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens, respectively, and R12, R22, R32, R42, R52, and R62 are the image-side radii of curvature of the first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens, respectively, in mm.

10. The small, low-distortion vehicle-mounted lens as described in claim 1, characterized in that: The small, low-distortion vehicle-mounted lens also meets the following conditions: 1.51≤nd1≤1.71, 1.71≤nd2≤2.0, 1.71≤nd3≤1.90, 1.73≤nd4≤1.90, 1.70≤nd5≤1.90, 1.51≤nd6≤1.66; 45≤vd1≤55, 30≤vd2≤35, 20≤vd3≤25 35≤vd4≤45, 40≤vd5≤45, 55≤vd6≤60; Wherein, nd1, nd2, nd3, nd4, nd5, and nd6 are the refractive indices of the first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens, respectively, and vd1, vd2, vd3, vd4, vd5, and vd6 are the Abbe numbers of the first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens, respectively.

Images