Vehicle-mounted lens and vehicle

Abstract

This invention proposes an automotive lens and vehicle. Based on the field of optical imaging technology, the automotive lens has an object side and an image side arranged opposite each other along the optical axis. The automotive lens includes a first lens with positive optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with negative optical power, and an image plane arranged sequentially from the object side to the image side, such that the diameter of the image plane of the automotive lens is between 5.0 mm and 6.5 mm, and the aperture value is between 2.2 and 2.4. The first lens is a spherical lens, and the second, third, and fourth lenses are plastic aspherical lenses. This solution achieves a lightweight, high-quality, low-cost, and low-temperature drift automotive lens by using four lenses and rationally setting the optical power and shape relationship of each lens.

Description

[0001] This application claims priority to Chinese Patent Application No. 202410900605.X, filed on July 5, 2024, entitled “A Vehicle-Mounted Lens and Vehicle”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This invention relates to the field of optical imaging technology, and in particular to a vehicle-mounted lens and vehicle. Background Technology

[0003] With the continuous development of technology and the progress of society, optical lenses are playing an increasingly significant role in the automotive field, and are widely used in vehicle systems. Currently, the consumer market is trending towards lower costs and smaller sizes, but many similar products have numerous lenses and complex structures. Furthermore, most existing low-cost, simple-structure lenses cannot maintain focus in environments with large temperature differences, and their field of view cannot meet consumer needs. Summary of the Invention

[0004] The main objective of this invention is to provide a vehicle-mounted lens and vehicle, which is lightweight, has high image quality, low cost, and low temperature drift.

[0005] To achieve the above objectives, the present invention proposes a vehicle-mounted lens having an object side and an image side arranged opposite to each other along the optical axis. The vehicle-mounted lens includes a first lens with positive optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with negative optical power, and an image plane arranged sequentially from the object side to the image side, such that the diameter of the image plane of the vehicle-mounted lens is between 5.0 mm and 6.5 mm, and the aperture value is between 2.2 and 2.4.

[0006] The first lens is a spherical lens, while the second, third, and fourth lenses are plastic aspherical lenses.

[0007] In one embodiment, the vehicle-mounted lens further includes an aperture stop disposed between the first lens and the object side.

[0008] In one embodiment, the vehicle-mounted lens further includes a photosensitive chip and a protective glass. The photosensitive chip is disposed on one side of the fourth lens facing the image side, and the protective glass is disposed between the photosensitive chip and the fourth lens to protect the photosensitive chip.

[0009] In one embodiment, the vehicle-mounted lens further includes a filter located on one side of the fourth lens in the image-side direction, the filter being used to filter out stray light in non-operating wavelength bands.

[0010] In one embodiment, the first lens is a concave-convex lens, and its object-side surface is concave.

[0011] The second lens is a biconcave lens;

[0012] The third lens is a concave-convex lens, and its object-side surface is concave.

[0013] The fourth lens is a concave-convex lens, and its object-side surface is convex.

[0014] In one embodiment, the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, and the focal length of the fourth lens is f4, wherein:

[0015] 4<f1<8, -13<f2<-9.3, 3.0<f3<4.3, -8.2<f4<-6.5.

[0016] In one embodiment, the first lens has a refractive index of n1 and a dispersion coefficient of v1, the second lens has a refractive index of n2 and a dispersion coefficient of v2, the third lens has a refractive index of n3 and a dispersion coefficient of v3, and the fourth lens has a focal refractive index of n4 and a dispersion coefficient of v4, wherein:

[0017] 1.80≤n1≤2.05, 1.55≤n2≤1.70, 1.55≤n3≤1.70, 1.55≤n4≤1.70, 23≤v1≤28, 18≤v2≤26, 18≤v3≤26, 18≤v4≤26.

[0018] In one embodiment, the total optical length of the vehicle-mounted lens is TTL, and the effective focal length of the vehicle-mounted lens is f, wherein:

[0019] TTL / f≤2.1.

[0020] The present invention also proposes a vehicle, the vehicle including the above-mentioned vehicle-mounted lens, the vehicle-mounted lens having an object side and an image side arranged opposite to each other along the optical axis, the vehicle-mounted lens including a first lens with positive optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with negative optical power and an image plane arranged sequentially from the object side to the image side, such that the diameter of the image plane of the vehicle-mounted lens is between 5.0 mm and 6.5 mm and the aperture value is between 2.2 and 2.4;

[0021] The first lens is a spherical lens, while the second, third, and fourth lenses are plastic aspherical lenses.

[0022] The technical solution provided by this invention, by setting the third lens with positive optical power, undertakes a large optical power of the system, changes the propagation direction of the light beam, corrects aberrations in the off-axis field of view, and is more conducive to the light beam imaging on the image plane; by setting the first lens as a spherical lens, aberrations are effectively improved, ensuring that it does not defocus under high temperature conditions; by setting the second, third, and fourth lenses as plastic aspherical lenses, the proportion of glass lenses used is greatly reduced, lowering costs; the light path of this lens is smooth, allowing more light to be introduced while making the structure more compact, with the image plane diameter controlled within 6.5mm. In terms of aperture, the aperture value F satisfies 2.2≤F≤2.4, and the lens can also image clearly in low light. Moreover, by reasonably setting the focal length ratio, the lens has good thermal aberration and more stable working performance. By using only four lenses and reasonably setting the optical power and shape matching of each lens, a lightweight, high-quality, low-cost, and low-temperature drift vehicle-mounted lens is achieved. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of an embodiment of the vehicle-mounted lens provided by the present invention;

[0025] Figure 2 for Figure 1 MTF schematic diagram of an embodiment of a vehicle-mounted camera;

[0026] Figure 3 for Figure 1 A schematic diagram of the MTF of an embodiment of a vehicle-mounted camera.

[0027] Description of Figure Numbers:

[0028] 1000. Vehicle-mounted lens; 1. First lens; 2. Second lens; 3. Third lens; 4. Fourth lens; 5. Aperture stop; 6. Filter; 7. Protective glass; 8. Image sensor.

[0029] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0032] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0033] With the continuous development of technology and the progress of society, optical lenses are playing an increasingly significant role in the automotive field, and are widely used in vehicle systems. Currently, the consumer market is trending towards lower costs and smaller sizes, but many similar products have numerous lenses and complex structures. Furthermore, most existing low-cost, simple-structure lenses cannot maintain focus in environments with large temperature differences, and their field of view cannot meet consumer needs.

[0034] The main objective of this invention is to provide a vehicle-mounted lens and vehicle, which is lightweight, has high image quality, low cost, and low temperature drift.

[0035] Please see Figure 1This invention proposes a vehicle-mounted lens 1000, which has an object side and an image side arranged opposite to each other along the optical axis. The vehicle-mounted lens 1000 includes a first lens 1 with positive optical power, a second lens 2 with negative optical power, a third lens 3 with positive optical power, a fourth lens 4 with negative optical power, and an image plane arranged sequentially from the object side to the image side, such that the diameter of the image plane of the vehicle-mounted lens 1000 is between 5.0 mm and 6.5 mm, and the aperture value is between 2.2 and 2.4; wherein, the first lens 1 is a spherical lens, and the second lens 2, the third lens, and the fourth lens 4 are plastic aspherical lenses.

[0036] The technical solution provided by this invention, by setting the third lens 3 with positive optical power, undertakes a large optical power of the system, changes the propagation direction of the light beam, corrects aberrations in the off-axis field of view, and is more conducive to the image formation of the light beam on the image plane; by setting the first lens 1 as a spherical lens, aberrations are effectively improved, ensuring that it does not defocus under high temperature conditions; by setting the second lens 2, the third lens 3, and the fourth lens 4 as plastic aspherical lenses, the proportion of glass lenses used is greatly reduced, lowering costs; the light path of this lens is smooth, allowing more light to be introduced while making the structure more compact, with the image plane diameter controlled within 6.5mm. In terms of aperture, the aperture value F satisfies 2.2≤F≤2.4, and the lens can also form clear images in low light. Moreover, by reasonably setting the focal length ratio, the lens has good thermal aberration and more stable working performance. By using only four lenses and reasonably setting the optical power and shape matching relationship of each lens, a lightweight, high-quality, low-cost, and low-temperature drift vehicle-mounted lens 1000 is achieved.

[0037] It should be noted that the characteristic of aspherical lenses is that the curvature changes continuously from the center of the lens to the periphery, unlike spherical lenses which have a constant curvature from the center to the periphery.

[0038] Furthermore, the vehicle-mounted lens 1000 also includes an aperture stop 5, which is disposed between the first lens 1 and the object side. The aperture stop 5 limits the light beam aperture on the optical axis, blocking some light rays, thereby reducing light spots, improving image contrast, and also expanding the target surface and improving image quality. Adjusting the light throughput of the aperture stop 5 according to actual conditions helps to further improve image quality.

[0039] Furthermore, the vehicle-mounted lens 1000 also includes a photosensitive chip 8 and a protective glass 7. The photosensitive chip 8 is disposed on the side of the fourth lens 4 facing the image side, and the protective glass 7 is disposed between the photosensitive chip 8 and the fourth lens 4 to protect the photosensitive chip. The protective glass 7 can provide waterproofing and dustproofing, protect the lens, enhance the anti-interference capability of the vehicle-mounted lens 1000, and improve image quality.

[0040] It is worth mentioning that the protective glass 7 is not limited to protecting the photosensitive chip 8, but can also be used to filter stray light. Specifically, the protective glass 7 is an infrared cut-off filter, which can effectively filter out infrared light that does not need to reach the imaging surface, thereby improving image quality.

[0041] Furthermore, the vehicle-mounted lens 1000 also includes a filter 6 located on the side of the fourth lens 4 facing the image side. The filter 6 is used to filter out stray light from non-operating wavelengths to reduce optical noise and simplify the subsequent photoelectric module processing. The filter 6 can also be used to adjust the color saturation of the image during final imaging.

[0042] Specifically, in a preferred embodiment, please refer to Figure 1 The first lens 1 is a concave-convex lens with a concave object-side surface; the second lens 2 is a biconcave lens; the third lens 3 is a concave-convex lens with a concave object-side surface; and the fourth lens 4 is a concave-convex lens with a convex object-side surface.

[0043] Further, the focal length of the first lens 1 is f1, the focal length of the second lens 2 is f2, the focal length of the third lens 3 is f3, and the focal length of the fourth lens 4 is f4, where: 4 < f1 < 8, -13 < f2 < -9.3, 3.0 < f3 < 4.3, -8.2 < f4 < -6.5. This embodiment is a preferred embodiment. By combining different lenses and rationally allocating their optical power, the entire lens achieves good performance such as low cost and high pixel count.

[0044] Further, the first lens 1 has a refractive index of n1 and a dispersion coefficient of v1, the second lens 2 has a refractive index of n2 and a dispersion coefficient of v2, the third lens 3 has a refractive index of n3 and a dispersion coefficient of v3, and the fourth lens 4 has a focal refractive index of n4 and a dispersion coefficient of v4, wherein: 1.80≤n1≤2.05, 1.55≤n2≤1.70, 1.55≤n3≤1.70, 1.55≤n4≤1.70, 23≤v1≤28, 18≤v2≤26, 18≤v3≤26, and 18≤v4≤26. ​​This embodiment is a preferred embodiment. By combining different lenses and rationally allocating their refractive indices and dispersion coefficients, the vehicle-mounted lens 1000 achieves low cost, high pixel count, and good thermal distortion reduction.

[0045] In one embodiment of the present invention, the total optical length of the vehicle-mounted lens 1000 is TTL, and the effective focal length of the vehicle-mounted lens 1000 is f, wherein TTL / f ≤ 2.1. By reasonably limiting the ratio of TTL to f, the entire lens becomes more compact, and it helps to control the focal length of the vehicle-mounted lens 1000, thus facilitating the miniaturization of the lens.

[0046] It is worth mentioning that the surface shape of the aspherical lens in the vehicle-mounted lens 1000 described in this embodiment should satisfy the following equation:

[0047]

[0048] Where c is the curvature corresponding to the radius; y is the radial coordinate (its unit is the same as the lens length unit); k is the conic conic coefficient, and A, B, C, D, E, F, G... represent the fourth, sixth, eighth, tenth, twelfth, fourteenth, sixteenth... aspheric coefficients, respectively. These parameters allow the setting of the shape and size of the aspheric surfaces facing the object and image sides of the lens.

[0049] Specifically, when k < -1, the corresponding lens surface curve is a hyperbola; when k = -1, the corresponding lens surface curve is a parabola; when -1 < k < 0, the corresponding lens surface curve is an ellipse; when k = 0, the corresponding lens surface curve is a circle; and when k > 0, the corresponding lens surface curve is an oval.

[0050] It should be noted that the basic parameters of the vehicle-mounted lens 1000 in one embodiment of the present invention are shown in Table 1, where the units of radius of curvature, thickness and semi-diameter are all millimeters (mm).

[0051] Table 1

[0052]

[0053]

[0054] In this embodiment, the aspherical coefficients of the aspherical lens in the vehicle-mounted lens 1000 include: the quadratic surface coefficient k, the fourth-order aspherical coefficient A, the sixth-order aspherical coefficient B, the eighth-order aspherical coefficient C, the tenth-order aspherical coefficient D, the twelfth-order aspherical coefficient E, the fourteenth-order aspherical coefficient F, and the sixteenth-order aspherical coefficient G, as shown in Table 2 below.

[0055] Table 2

[0056] Face number k A B C D E F G 4 4.46E+01 -3.96E-02 1.65E-02 -2.97E-02 2.55E-02 -1.25E-02 3.15E-03 -3.08E-04 5 3.08E+00 -2.97E-02 -5.43E-03 3.93E-03 -1.40E-03 3.65E-04 -6.42E-05 4.64E-06 6 -5.04E-01 3.21E-02 -1.35E-02 2.71E-03 1.58E-03 -8.37E-04 1.47E-04 -9.49E-06 7 -1.49E+00 1.44E-02 -8.87E-03 1.77E-03 7.92E-05 -4.24E-05 4.84E-06 -4.09E-07 8 -6.77E+01 -2.62E-02 -1.39E-03 1.83E-03 -4.94E-04 7.00E-05 -4.65E-06 1.21E-07 9 -1.19E+01 -4.53E-02 1.35E-02 -3.78E-03 8.26E-04 -1.20E-04 1.06E-05 -4.08E-07

[0057] Please refer to Figure 2 This is a schematic diagram of the MTF of the vehicle-mounted lens 1000 in this embodiment. It shows the imaging quality of several wavelengths of light. The horizontal axis represents the number of line pairs, and the vertical axis represents the resolution capability. The higher the value of the vertical axis, the stronger the resolution capability and the higher the image quality reproduction. The MTF values ​​are all greater than 0.3, indicating that the imaging quality is very clear.

[0058] In this embodiment, the vehicle-mounted lens 1000 has a focal length of 4.95mm, an aperture of 2.4, an image plane diameter of 6.3mm, and a diagonal field of view of 68°. This ensures that various aberrations of the lens are corrected, improves edge image quality, and provides high image quality. It can also produce clear images in low light. Furthermore, the lens has a small image plane diameter and does not defocus under environmental conditions ranging from -40℃ to +105℃, maintaining good performance and relatively stable operation.

[0059] It should be noted that, in another embodiment of the present invention, the basic parameters of the vehicle-mounted lens 1000 are shown in Table 3, where the units of radius of curvature, thickness and semi-diameter are all millimeters (mm).

[0060] Table 3

[0061]

[0062] In this embodiment, the aspherical coefficients of the aspherical lens in the vehicle-mounted lens 1000 include: the quadratic surface coefficient k, the fourth-order aspherical coefficient A, the sixth-order aspherical coefficient B, the eighth-order aspherical coefficient C, the tenth-order aspherical coefficient D, the twelfth-order aspherical coefficient E, the fourteenth-order aspherical coefficient F, and the sixteenth-order aspherical coefficient G, as shown in Table 4 below.

[0063] Table 4

[0064] Face number k A B C D E F G 4 5.70E+01 -3.87E-02 1.56E-02 -3.04E-02 2.67E-02 -1.27E-02 2.90E-03 -2.26E-04 5 3.25E+00 -2.90E-02 -5.93E-03 4.12E-03 -1.47E-03 3.61E-04 -6.54E-05 5.90E-06 6 -8.03E-01 3.53E-02 -1.35E-02 2.67E-03 1.52E-03 -8.23E-04 1.47E-04 -9.55E-06 7 -1.58E+00 1.40E-02 -8.97E-03 1.79E-03 8.79E-05 -4.88E-05 6.10E-06 -5.02E-07 8 -4.32E+01 -2.76E-02 -1.60E-03 1.79E-03 -5.14E-04 7.68E-05 -4.58E-06 5.98E-08 9 -1.17E+01 -4.75E-02 1.36E-02 -3.79E-03 8.24E-04 -1.20E-04 1.05E-05 -3.97E-07

[0065] Please refer to Figure 3 This is a schematic diagram of the MTF of the vehicle-mounted lens 1000 in this embodiment. It shows the imaging quality of several wavelengths of light. The horizontal axis represents the number of line pairs, and the vertical axis represents the resolution capability. The higher the value of the vertical axis, the stronger the resolution capability and the higher the image quality reproduction. The MTF values ​​are all greater than 0.3, indicating that the imaging quality is very clear.

[0066] In this embodiment, the vehicle-mounted lens 1000 has a focal length of 4.95mm, an aperture of 2.4, an image plane diameter of 6.3mm, and a diagonal field of view of 67.2°. This ensures that various aberrations of the lens are corrected, improves edge image quality, and provides high image quality. It can also produce clear images in low light. Furthermore, the lens has a small image plane diameter and does not defocus under environmental conditions ranging from -40℃ to +105℃, maintaining good performance and relatively stable operation.

[0067] The present invention also proposes a vehicle, the vehicle including the above-mentioned vehicle-mounted lens 1000. Since the vehicle includes the vehicle-mounted lens 1000, the specific structure of the vehicle-mounted lens 1000 refers to the above embodiments. Since the vehicle-mounted lens 1000 of this vehicle adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0068] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A vehicle-mounted lens, characterized in that, The vehicle-mounted lens has an object side and an image side arranged opposite to each other along the optical axis. The number of lenses in the lens is set to four. The vehicle-mounted lens includes a first lens with positive optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with negative optical power, and an image plane arranged sequentially from the object side to the image side, so that the diameter of the image plane of the vehicle-mounted lens is between 5.0 mm and 6.5 mm, and the aperture value is between 2.2 and 2.

4. The first lens is a spherical lens, and the second, third, and fourth lenses are plastic aspherical lenses. The first lens is a concave-convex lens, and its object-side surface is concave. The second lens is a concave-convex lens, and its object-side surface is convex. The third lens is a concave-convex lens, and its object-side surface is concave. The fourth lens is a concave-convex lens, and its object-side surface is convex. The first lens has a refractive index of n1 and a dispersion coefficient of v1, the second lens has a refractive index of n2 and a dispersion coefficient of v2, the third lens has a refractive index of n3 and a dispersion coefficient of v3, and the fourth lens has a focal refractive index of n4 and a dispersion coefficient of v4, wherein: 1.80≤n1≤2.05, 1.55≤n2≤1.70, 1.55≤n3≤1.70, 1.55≤n4≤1.70, 23≤v1≤28, 18≤v2≤26, 18≤v3≤26, and 18≤v4≤26.

2. The vehicle-mounted lens as described in claim 1, characterized in that, The vehicle-mounted lens also includes an aperture stop, which is disposed between the first lens and the object side.

3. The vehicle-mounted lens as described in claim 1, characterized in that, The vehicle-mounted lens also includes a photosensitive chip and a protective glass. The photosensitive chip is disposed on one side of the fourth lens facing the image side, and the protective glass is disposed between the photosensitive chip and the fourth lens to protect the photosensitive chip.

4. The vehicle-mounted lens as described in claim 1, characterized in that, The vehicle-mounted lens also includes a filter located on one side of the fourth lens facing the image side, the filter being used to filter out stray light in non-working wavelength bands.

5. The vehicle-mounted lens as described in claim 1, characterized in that, The focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, and the focal length of the fourth lens is f4, wherein: 4 < f1 < 8, -13 < f2 < -9.3, 3.0 < f3 < 4.3, -8.2 < f4 < -6.

5.

6. The vehicle-mounted lens as described in claim 1, characterized in that, The total optical length of the vehicle-mounted lens is TTL, and the effective focal length of the vehicle-mounted lens is f, wherein: TTL / f≤2.

1.

7. A vehicle, characterized in that, Including the vehicle-mounted camera as described in any one of claims 1 to 6.

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