A vehicle-mounted lens

Abstract

The present invention discloses a vehicle lens, which sequentially includes a first lens to an eighth lens along an optical axis from the object side to the image side; the first lens to the eighth lens each include an object side facing the object side and allowing imaging light to pass through and an image side facing the image side and allowing imaging light to pass through; the first lens has a negative refractive power; the second lens has a negative refractive power; the third lens has a negative refractive power; the fourth lens has a positive refractive power; the fifth lens has a positive refractive power; the sixth lens has a negative refractive power; the seventh lens has a positive refractive power; the eighth lens has a negative refractive power; there are only the above eight lenses with refractive power in the optical imaging lens. The lens in the present invention has the characteristics of high image quality, simple structure, low cost, strong stability and mass production; under the same focal length segment, it has a larger field of view angle than a conventional lens, the distortion curve approaches linearity, and the outer diameter of the lens is small, the total length is short, the size of the lens is small, and it will not interfere with driving.

Description

Technical Field

[0001] The present invention relates to the technical field of lenses, and particularly to a vehicle lens. Background Art

[0002] With the continuous progress of science and technology and the continuous development of society, in recent years, optical imaging lenses have also developed rapidly and are widely used in various fields such as smart phones, tablet computers, video conferencing, vehicle monitoring, and security monitoring. Therefore, the requirements for optical imaging lenses are getting higher and higher. However, the current vehicle lenses at least still have the following defects:

[0003] 1. Generally, the pixel of the lens is not high, or although it reaches a high pixel, the cost is high, the structure is complex, and it has no competitiveness.

[0004] 2. Generally, the lens pursues high pixels and large angles, which will cause the lens size to be too large and interfere with driving.

[0005] 3. Generally, the reliability requirement of the lens is not high and cannot meet the increasingly strict vehicle regulations.

[0006] 4. Generally, the lens is prone to defocusing at high and low temperatures and cannot meet the temperature requirements of vehicle regulations. Summary of the Invention

[0007] The purpose of the present invention is to provide a vehicle lens to at least solve one of the above problems.

[0008] To achieve the above purpose, the present invention adopts the following technical solutions:

[0009] A vehicle lens sequentially includes a first lens to an eighth lens along an optical axis from the object side to the image side; each of the first lens to the eighth lens includes an object side facing the object side and allowing imaging light to pass through and an image side facing the image side and allowing imaging light to pass through;

[0010] The first lens has a negative refractive power, the object side of the first lens is a convex surface, and the image side is a concave surface;

[0011] The second lens has a negative refractive power, the object side of the second lens is a convex surface, and the image side is a concave surface;

[0012] The third lens has a negative refractive power, the object side of the third lens is a concave surface, and the image side is a convex surface;

[0013] The fourth lens has a positive refractive power, the object side of the fourth lens is a convex surface, and the image side is a convex surface;

[0014] The fifth lens has a positive refractive power, the object side of the fifth lens is a convex surface, and the image side is a convex surface;

[0015] The sixth lens has a negative refractive power, the object side surface of the sixth lens is concave, and the image side surface is concave;

[0016] The seventh lens has a positive refractive power, the object side surface of the seventh lens is convex, and the image side surface is convex;

[0017] The eighth lens has a negative refractive power, the object side surface of the eighth lens is convex, and the image side surface is concave;

[0018] There are only the above eight lenses with refractive power in this optical imaging lens.

[0019] Preferably, the first lens satisfies: D1 / T1 ≤ 12, where T1 is the central thickness of the first lens, and D1 is the outer diameter of the first lens.

[0020] Preferably, between the focal length value f1 of the first lens and the focal length value f2 of the second lens, it satisfies: 0.6 ≤ |f1 / f2| ≤ 1.5.

[0021] Preferably, the second lens adopts a glass aspherical lens.

[0022] Preferably, the refractive index nd4 of the fourth lens satisfies: nd4 ≥ 1.7.

[0023] Preferably, it further includes a diaphragm, and the diaphragm is arranged between the fourth lens and the fifth lens.

[0024] Preferably, the image side surface of the fifth lens and the object side surface of the sixth lens are adhesively bonded to each other, and satisfy: vd5 - vd6 > 30, where vd5 is the Abbe number of the fifth lens, and vd6 is the Abbe number of the sixth lens.

[0025] Preferably, the Abbe number vd7 of the seventh lens satisfies: vd7 > 50.

[0026] Preferably, it conforms to the following conditional formula: TTL / h ≤ 5.5, where TTL is the overall optical length of the lens, and h is the designed image height of the optical lens.

[0027] Preferably, it conforms to the following conditional formula: (FOV × f) / h ≥ 70, where FOV is the field of view angle of the optical lens, f is the focal length value of the entire lens, and h is the designed image height of the optical lens.

[0028] After adopting the above technical solution, compared with the background technology, the present invention has the following advantages:

[0029] 1. The present invention adopts eight lenses along the object side to the image side direction, and through corresponding designs for each lens, the lens has the characteristics of high image quality, simple structure, low cost, strong stability and mass production.

[0030] 2. Under the same focal length range, the present invention has a larger field of view angle than conventional lenses. The distortion curve approaches linearity, and the outer diameter of the lens is small, the overall length is short, and the size of the lens is small, which will not interfere with driving.

[0031] 3. By reasonably matching each lens, the present invention can achieve an athermal design of the lens, so that the temperature drift amount of the lens during operation in high and low temperature environments is small, and it is not easy to defocus, meeting the temperature requirements of vehicle regulations.

[0032] 4. The design of the first lens in the present invention can meet the reliability requirements such as vehicle drop ball and gravel, to prevent the first lens from cracking. Moreover, the meniscus shape design of the first lens convex toward the object side is beneficial to the sliding of water droplets, and it can be used without obstacles in rain and snow environments, reducing the impact on imaging and improving the reliability of lens use. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is the optical path diagram of Embodiment 1;

[0034] Figure 2 It is the MTF curve diagram of the lens in Embodiment 1 under visible light;

[0035] Figure 3 It is the field curvature and distortion diagram of the lens in Embodiment 1 under visible light;

[0036] Figure 4 It is the lateral chromatic aberration curve diagram of the lens in Embodiment 1 under visible light;

[0037] Figure 5 It is the optical path diagram of Embodiment 2;

[0038] Figure 6 It is the MTF curve diagram of the lens in Embodiment 2 under visible light;

[0039] Figure 7 It is the field curvature and distortion diagram of the lens in Embodiment 2 under visible light;

[0040] Figure 8 It is the lateral chromatic aberration curve diagram of the lens in Embodiment 2 under visible light;

[0041] Figure 9 It is the optical path diagram of Embodiment 3;

[0042] Figure 10 It is the MTF curve diagram of the lens in Embodiment 3 under visible light;

[0043] Figure 11 It is the field curvature and distortion diagram of the lens in Embodiment 3 under visible light;

[0044] Figure 12 It is the lateral chromatic aberration curve diagram of the lens in Embodiment 3 under visible light;

[0045] Figure 13 It is the optical path diagram of the fourth embodiment;

[0046] Figure 14 It is the MTF curve graph of the lens under visible light in the fourth embodiment;

[0047] Figure 15 It is the field curvature and distortion graph of the lens under visible light in the fourth embodiment;

[0048] Figure 16 It is the lateral chromatic aberration curve graph of the lens under visible light in the fourth embodiment.

[0049] Explanation of the reference numerals in the drawings:

[0050] The first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, the eighth lens 8, the diaphragm 9, the protective glass 10. Detailed implementation manners

[0051] To further illustrate each embodiment, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be combined with the relevant descriptions in the specification to explain the operating principle of the embodiments. With reference to these contents, those of ordinary skill in the art should be able to understand other possible implementation manners and the advantages of the present invention. The components in the drawings are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0052] Now, the present invention will be further described in conjunction with the drawings and the detailed implementation manners.

[0053] In the present specification, when it is said that "the lens has a positive refractive power (or a negative refractive power)", it means that the paraxial refractive power calculated by the lens using Gaussian optical theory is positive (or negative). When it is said that "the object side (or the image side) of the lens", it is defined as the specific range where the imaging light passes through the lens surface. The judgment of the convexity and concavity of the lens surface can be made in the same way as those with ordinary knowledge in this field, that is, by the positive and negative signs of the radius of curvature (abbreviated as the R value) to judge the convexity and concavity of the lens surface. The R value is commonly used in optical design software, such as Zemax or CodeV. The R value is also commonly found in the lens data sheet of optical design software. Taking the object side as an example, when the R value is positive, it is determined that the object side is a convex surface; when the R value is negative, it is determined that the object side is a concave surface. On the contrary, taking the image side as an example, when the R value is positive, it is determined that the image side is a concave surface; when the R value is negative, it is determined that the image side is a convex surface.

[0054] The present invention discloses a vehicle lens, which sequentially includes a first lens to an eighth lens along an optical axis from the object side to the image side; each of the first lens to the eighth lens includes an object side facing the object side and allowing imaging light to pass through, and an image side facing the image side and allowing imaging light to pass through.

[0055] The first lens has a negative refractive power, the object side of the first lens is a convex surface, and the image side is a concave surface;

[0056] The second lens has a negative refractive power, the object side of the second lens is a convex surface, and the image side is a concave surface;

[0057] The third lens has a negative refractive power, the object side of the third lens is a concave surface, and the image side is a convex surface;

[0058] The fourth lens has a positive refractive power, the object side of the fourth lens is a convex surface, and the image side is a convex surface;

[0059] The fifth lens has a positive refractive power, the object side of the fifth lens is a convex surface, and the image side is a convex surface;

[0060] The sixth lens has a negative refractive power, the object side of the sixth lens is a concave surface, and the image side is a concave surface;

[0061] The seventh lens has a positive refractive power, the object side of the seventh lens is a convex surface, and the image side is a convex surface;

[0062] The eighth lens has a negative refractive power, the object side of the eighth lens is a convex surface, and the image side is a concave surface;

[0063] There are only the above eight lenses with refractive power in this optical imaging lens.

[0064] Preferably, the first lens satisfies: D1 / T1≤12, where T1 is the central thickness of the first lens, and D1 is the outer diameter of the first lens. Such a setting can meet the reliability requirements such as vehicle specification drop ball and gravel, prevent the first lens from cracking, and the meniscus shape design convex to the object side is conducive to the water droplet slipping, and can be used without obstacles in rainy and snowy environments, reducing the impact on imaging.

[0065] Preferably, the focal length value f1 of the first lens and the focal length value f2 of the second lens satisfy: 0.6≤|f1 / f2|≤1.5. By reasonably distributing the optical power, it is beneficial to improve the resolution quality.

[0066] Preferably, the second lens adopts a glass aspherical lens. The aspherical lens has the advantages of improving field curvature and astigmatism, thereby improving the imaging quality of the lens, and can also reduce the overall weight of the system, which is beneficial to the miniaturization of the lens.

[0067] The equations of the object-side and image-side curves of the glass aspherical lens are as follows:

[0068]

[0069] Where:

[0070] z: The depth of the aspherical surface (the vertical distance between a point on the aspherical surface at a distance y from the optical axis and the tangent plane at the vertex of the aspherical surface on the optical axis);

[0071] c: The curvature of the aspherical vertex (the vertex curvature);

[0072] K: The conic constant (Conic Constant);

[0073] Radial distance;

[0074] r n : The normalization radius (normalization radius (NRADIUS));

[0075] u: r / r n ;

[0076] am: The mth Q con Coefficient (is the mth Qcon coefficient);

[0077] Q m con : The mth Q con Polynomial (the mth Qcon polynomial).

[0078] Preferably, the refractive index nd4 of the fourth lens satisfies: nd4 ≥ 1.7, more preferably, nd4 ≥ 1.8, which is beneficial to reducing the aperture of the lens and improving the imaging quality.

[0079] Preferably, a diaphragm is further included, and the diaphragm is arranged between the fourth lens and the fifth lens.

[0080] Preferably, the image side of the fifth lens and the object side of the sixth lens are glued to each other and satisfy: vd5 - vd6 > 30, where vd5 is the Abbe number of the fifth lens and vd6 is the Abbe number of the sixth lens, which can help eliminate the influence of chromatic aberration, reduce field curvature, and correct coma. At the same time, the residual chromatic aberration of the glued lens is used to balance the overall chromatic aberration of the optical system. Gluing makes the system as a whole compact, meets the miniaturization requirements, and the gluing of the lenses will reduce the tilt / eccentricity generated during the assembly process.

[0081] Preferably, the Abbe number vd7 of the seventh lens satisfies: vd7 > 50. Matching with a low-dispersion material is beneficial to correcting off-axis chromatic aberration.

[0082] Preferably, the following conditional formula is satisfied: TTL / h ≤ 5.5, where TTL is the total optical length of the lens and h is the designed image height of the optical lens, which can achieve miniaturization of the optical lens. Compared with other lenses, the TTL is shorter under the same imaging plane.

[0083] Preferably, the following conditional formula is satisfied: (FOV × f) / h ≥ 70, where FOV is the field of view angle of the optical lens, f is the focal length value of the entire lens, and h is the designed image height of the optical lens, which can achieve high angular resolution and a wider field of view angle at the same focal length segment.

[0084] Hereinafter, the vehicle-mounted lens of the present invention will be described in detail with specific embodiments.

[0085] Embodiment 1

[0086] Reference Figure 1 As shown, this embodiment discloses a vehicle-mounted lens, which sequentially includes a first lens 1 to an eighth lens 8 along an optical axis from the object side A1 to the image side A2; each of the first lens 1 to the eighth lens 8 includes an object side facing the object side A1 and allowing imaging light to pass through and an image side facing the image side A2 and allowing imaging light to pass through.

[0087] The first lens 1 has a negative refractive power, the object side of the first lens 1 is a convex surface, and the image side is a concave surface.

[0088] The second lens 2 has a negative refractive power, the object side of the second lens 2 is a convex surface, and the image side is a concave surface.

[0089] The third lens 3 has a negative refractive power, the object side of the third lens 3 is a concave surface, and the image side is a convex surface.

[0090] The fourth lens 4 has a positive refractive power, the object side of the fourth lens 4 is a convex surface, and the image side is a convex surface.

[0091] The fifth lens 5 has a positive refractive power, the object side of the fifth lens 5 is a convex surface, and the image side is a convex surface.

[0092] The sixth lens 6 has a negative refractive power, the object side of the sixth lens 6 is a concave surface, and the image side is a concave surface.

[0093] The seventh lens 7 has a positive refractive power, the object side of the seventh lens 7 is a convex surface, and the image side is a convex surface.

[0094] The eighth lens 8 has a negative refractive power, the object side of the eighth lens 8 is a convex surface, and the image side is a concave surface.

[0095] The optical imaging lens has only the above eight lenses with refractive power.

[0096] In this embodiment, the image side of the fifth lens 5 is adhesively bonded to the object side of the sixth lens 6, and the aperture stop 9 is disposed between the fourth lens 4 and the fifth lens 5. Of course, in other embodiments, the aperture stop 9 can also be disposed at other suitable positions.

[0097] The detailed optical data of this specific embodiment are shown in Table 1.

[0098] Table 1 Detailed Optical Data of Embodiment 1

[0099]

[0100]

[0101] In this specific embodiment, the second lens 2 and the eighth lens 8 are made of glass aspherical lenses. For the detailed data of the aspherical parameters of the second lens 2 and the eighth lens 8, please refer to the following table:

[0102] Surface Serial Number K A4 A6 A8 A10 S3 -1.566 -4.07E-03 1.96E-04 -4.09E-06 3.25E-08 S4 -6.270 5.98E-03 0 5.05E-05 -3.11E-07 S15 -16.878 0 -6.53E-04 4.43E-05 0 S16 -21.403 6.32E-03 -9.89E-04 9.23E-05 -2.63E-06

[0103] In this specific embodiment, the focal length f of the optical imaging lens is 3.2 mm; the aperture FNO is 2.0; the field of view angle FOV is 150°; the target surface size IMH is 6 mm; the total optical length TTL is 30.26 mm.

[0104] For the optical path diagram of the optical imaging lens in this specific embodiment, please refer to Figure 1 . For the MTF curve diagrams of the lens at different focal lengths under visible light, please refer to Figure 2 . It can be seen from the figure that when the spatial frequency of this lens reaches 125 lp / mm, the full-field transfer function image is still greater than 35%. The full-field transfer function image is well controlled, and the resolution and imaging quality are high. For the field curvature and distortion diagrams of the lens under visible light, please refer to Figure 3 . It can be seen from the figure that the distortion is small, the image deformation is small, the image restoration is relatively accurate, and the imaging quality is high. For the lateral chromatic aberration curve diagram of the lens under visible light, please refer to Figure 4 . It can be seen from the figure that after the lens is apochromatically corrected, in the wide spectral band of visible light from 470 to 656 nm, the later color is less than 5 μm, the chromatic aberration of the image is small, the imaging quality is high, and the imaging color reducibility of the image is improved.

[0105] Embodiment 2

[0106] Cooperate with Figures 5 to 8 As shown, the surface concavity and convexity and refractive power of each lens in this embodiment are substantially the same as those in Embodiment 1, and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0107] The detailed optical data of this specific embodiment are shown in Table 2.

[0108] Table 2 Detailed optical data of Embodiment 2

[0109] Surface Serial Number Type Radius of Curvature Thickness Material Refractive Index Abbe Number Lens Focal Length 1 First Lens 19.290 1.367 Glass 1.804 46.568 -14.82 2 7.167 1.535 3 Second Lens 7.151 2.300 Glass 1.768 49.241 -15.29 4 3.827 2.679 5 Third Lens -7.838 5.644 Glass 1.821 42.656 -33.65 6 -14.481 0.243 7 Fourth Lens 15.305 2.642 Glass 1.878 38.072 9.16 8 -15.735 1.000 9 Diaphragm INF 1.544 10 Fifth Lens 8.555 2.650 Glass 1.497 81.595 7.09 11 Sixth Lens -5.398 0.531 Glass 1.808 22.691 -6.16 12 73.587 0.057 13 Seventh Lens 9.846 3.136 Glass 1.497 81.595 10.44 14 -9.846 0.617 15 Eighth Lens 5.822 2.017 Glass 1.810 41.000 -833.04 16 4.875 1.000 17 Protective Glass INF 0.500 Glass 1.517 64.212 18 INF 0.816 19 Imaging Plane INF

[0110] In this specific embodiment, the second lens 2 and the eighth lens 8 are made of glass aspherical lenses. For the detailed data of the aspherical parameters of the second lens 2 and the eighth lens 8, please refer to the following table:

[0111]

[0112]

[0113] In this specific embodiment, the focal length f of the optical imaging lens is 3.2 mm; the aperture FNO is 2.0; the field of view angle FOV is 150°; the target surface size IMH is 6 mm; the total optical length TTL is 30.28 mm.

[0114] For the optical path diagram of the optical imaging lens in this specific embodiment, please refer to Figure 5 ... For the MTF curve diagrams of the lens at different focal lengths under visible light, please refer to Figure 6 ... It can be seen from the figure that when the spatial frequency of this lens reaches 125 lp / mm, the full-field transfer function image is still greater than 30%. The full-field transfer function image is well controlled, and the resolution and imaging quality are high. For the field curvature and distortion diagrams of the lens under visible light, please refer to Figure 7 ... It can be seen from the figure that the distortion is small, the image deformation is small, the image restoration is relatively accurate, and the imaging quality is high. For the lateral chromatic aberration curve diagram of the lens under visible light, please refer to Figure 8 ... It can be seen from the figure that after the apochromatic design of the lens, in the wide spectral band of visible light from 470 to 656 nm, the later color is less than 5 μm, the chromatic aberration of the image is small, the imaging quality is high, and the imaging color reducibility of the image is improved.

[0115] Embodiment 3

[0116] Cooperate with Figures 9 to 12 As shown, the surface concavity and convexity and refractive index of each lens in this embodiment are roughly the same as those in Embodiment 1, but the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0117] The detailed optical data of this specific embodiment are shown in Table 3.

[0118] Table 3 Detailed optical data of Embodiment 3

[0119]

[0120]

[0121] In this specific embodiment, the second lens 2 and the eighth lens 8 are made of glass aspherical lenses. For the detailed data of the aspherical parameters of the second lens 2 and the eighth lens 8, please refer to the following table:

[0122] Surface Serial Number K A4 A6 A8 A10 S3 -1.911 -4.14E-03 2.01E-04 -4.26E-06 3.43E-08 S4 -6.257 0 -4.35E-04 0 -4.36E-07 S15 -11.345 5.14E-03 -6.56E-04 4.78E-05 -1.89E-06 S16 -13.731 5.84E-03 -9.90E-04 9.50E-05 -2.70E-06

[0123] In this specific embodiment, the focal length f of the optical imaging lens is 3.2 mm; the aperture FNO is 2.0; the field of view FOV is 150°; the image sensor size IMH is 6 mm; the total optical length TTL is 30.01 mm.

[0124] For the optical path diagram of the optical imaging lens in this specific embodiment, please refer to Figure 9 . For the MTF curve diagrams of the lens at different focal lengths under visible light, please refer to Figure 10 . As can be seen from the figure, when the spatial frequency of this lens reaches 125 lp / mm, the full-field transfer function image is still greater than 30%. The full-field transfer function image is well controlled, and the resolution and imaging quality are high. For the field curvature and distortion diagrams of the lens under visible light, please refer to Figure 11 . As can be seen from the figure, the distortion is small, the image deformation is small, the image restoration is relatively accurate, and the imaging quality is high. For the lateral chromatic aberration curve diagram of the lens under visible light, please refer to Figure 12 . As can be seen from the figure, through apochromatic design, in the wide spectral band of visible light from 470 to 656 nm, the lateral color is less than 5 μm, the chromatic aberration of the image is small, the imaging quality is high, and the imaging color reducibility of the image is improved.

[0125] Embodiment 4

[0126] Cooperate with Figures 13 to 16 As shown, the surface concavity / convexity and refractive index of each lens in this embodiment are roughly the same as those in Embodiment 1, but the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0127] The detailed optical data of this specific embodiment are shown in Table 4.

[0128] Table 4 Detailed Optical Data of Embodiment 4

[0129] Surface Serial Number Type Radius of Curvature Thickness Material Refractive Index Abbe Number Lens Focal Length 1 First Lens 27.571 2.235 Glass 1.517 64.198 -18.52 2 6.924 1.914 3 Second Lens 6.303 1.343 Glass 1.694 53.151 -20.9 4 4.013 2.872 5 Third Lens -5.593 5.338 Glass 1.517 64.198 -64.35 6 -8.910 0.158 7 Fourth Lens 28.248 1.999 Glass 1.850 32.308 14.09 8 -20.323 1.572 9 Diaphragm Infinity 1.262 10 Fifth Lens 6.570 2.075 Glass 1.593 68.525 5.87 11 Sixth Lens -6.568 0.579 Glass 2.001 25.435 -5.58 12 40.832 0.081 13 Seventh Lens 8.734 2.907 Glass 1.593 68.525 7.83 14 -8.734 1.148 15 Eighth Lens 7.414 1.812 Glass 1.833 37.345 -31.25 16 5.133 1.000 17 Protective Glass Infinity 0.500 Glass 1.517 64.198 18 Infinity 0.942 19 Imaging Plane Infinity

[0130] In this specific embodiment, the second lens 2 and the eighth lens 8 are made of glass aspherical lenses. For the detailed data of the aspherical parameters of the second lens 2 and the eighth lens 8, please refer to the following table:

[0131] Surface Serial Number K A4 A6 A8 A10 S3 -7.532 -4.31E-03 2.54E-04 -5.82E-06 0 S4 -1.266 -8.74E-03 1.08E-03 -6.48E-05 2.43E-06 S15 -33.808 2.65E-03 -8.49E-04 8.65E-05 -4.45E-06 S16 -25.286 0 -1.18E-03 1.75E-04 -6.97E-06

[0132] In this specific embodiment, the focal length f of the optical imaging lens is 3.2 mm; the aperture FNO is 2.0; the field of view FOV is 150°; the image sensor height IMH is 6 mm; and the total optical length TTL is 29.74 mm.

[0133] For the optical path diagram of the optical imaging lens in this specific embodiment, please refer to Figure 13 . For the MTF curve diagrams of the lens at different focal lengths under visible light, please refer to Figure 14 . It can be seen from the figure that when the spatial frequency of this lens reaches 125 lp / mm, the full-field transfer function image is still greater than 30%, the full-field transfer function image is well controlled, and the resolution and imaging quality are high. For the field curvature and distortion diagrams of the lens under visible light, please refer to Figure 15 . It can be seen from the figure that the distortion is small, the image deformation is small, the image restoration is relatively accurate, and the imaging quality is high. For the lateral chromatic aberration curve diagram of the lens under visible light, please refer to Figure 16 . It can be seen from the figure that after the apochromatic design of the lens, in the wide spectral band of visible light from 470 to 656 nm, the lateral color is less than 5 μm, the chromatic aberration of the image is small, the imaging quality is high, and the imaging color reducibility of the image is improved.

[0134] Table 5 shows the numerical values of the relevant important parameters of the three embodiments of the present invention:

[0135] Table 5 Relevant important parameters of each embodiment

[0136]

[0137]

[0138] As mentioned above, the above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A vehicle lens, characterized in that, From the object side to the image side along an optical axis, it sequentially includes a first lens to an eighth lens; each of the first lens to the eighth lens includes an object side facing the object side and allowing imaging light to pass through, and an image side facing the image side and allowing imaging light to pass through; The first lens has a negative refractive power, the object side of the first lens is convex, and the image side is concave; The second lens has a negative refractive power, the object side of the second lens is convex, and the image side is concave; The third lens has a negative refractive power, the object side of the third lens is concave, and the image side is convex; The fourth lens has a positive refractive power, the object side of the fourth lens is convex, and the image side is convex; The fifth lens has a positive refractive power, the object side of the fifth lens is convex, and the image side is convex; The sixth lens has a negative refractive power, the object side of the sixth lens is concave, and the image side is concave; The seventh lens has a positive refractive power, the object side of the seventh lens is convex, and the image side is convex; The eighth lens has a negative refractive power, the object side of the eighth lens is convex, and the image side is concave; There are only the above eight lenses with refractive power in this vehicle lens; Between the focal length value f1 of the first lens and the focal length value f2 of the second lens, it satisfies: 0.6 ≤ |f1 / f2| ≤ 1.

5.

2. The vehicle lens according to claim 1, wherein The first lens satisfies: D1 / T1 ≤ 12, where T1 is the central thickness of the first lens, and D1 is the outer diameter of the first lens.

3. The vehicle lens according to claim 1, characterized in that, The second lens uses a glass aspherical lens.

4. A vehicle lens according to claim 1, characterized in that, The refractive index nd4 of the fourth lens satisfies: nd4 ≥ 1.

7.

5. A vehicle lens according to claim 1, characterized in that, It further includes a diaphragm, and the diaphragm is arranged between the fourth lens and the fifth lens.

6. A vehicle lens according to claim 1, characterized in that, The image side of the fifth lens and the object side of the sixth lens are adhesively bonded to each other, and it satisfies: vd5 - vd6 > 30, where vd5 is the Abbe number of the fifth lens, and vd6 is the Abbe number of the sixth lens.

7. A vehicle lens according to claim 1, characterized in that The Abbe number vd7 of the seventh lens satisfies: vd7 > 50.

8. A vehicle lens according to claim 1, characterized in that, It conforms to the following conditional formula: TTL / h ≤ 5.5, where TTL is the overall optical length of the lens, and h is the designed image height of the optical lens.

9. A vehicle lens according to claim 1, characterized in that, It conforms to the following conditional formula: (FOV × f) / h ≥ 70, where FOV is the field of view angle of the optical lens, f is the focal length value of the entire lens, and h is the designed image height of the optical lens.

Images