Vehicle-mounted optical system and vehicle-mounted lens module

Abstract

The invention provides a vehicle-mounted optical system and a vehicle-mounted lens module. The vehicle-mounted optical system comprises a first lens to a sixth lens; the distance TTL from the object side surface of the first lens to the imaging surface along the optical axis direction and the image height ImgH of the vehicle-mounted optical system meet the following conditions: 5.3 lt; and TTL / ImgHlt; 6.8); the effective focal length f1 of the first lens and the effective focal length f of the vehicle-mounted optical system meet the following conditions:-2.7 lt; f1 / flt; -0.9;-0.9; the effective focal length f2 of the second lens and the effective focal length f of the vehicle-mounted optical system satisfy 1.3 lt; f2 / flt; 4.1, 4.1; the refractive index N1 of the first lens, the refractive index N2 of the second lens, the Abbe number V1 of the first lens and the Abbe number V2 of the second lens meet the condition that (V1 + V2) / (N1 + N2) lt is greater than or equal to 20; 30. The problem that miniaturization and small aberration of a vehicle-mounted optical system in the prior art are difficult to consider at the same time is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical imaging devices, and in particular, to a vehicle-mounted optical system and a vehicle-mounted lens module. Background Art

[0002] With the development of technology and the improvement of application requirements, optical systems have been widely used in many devices, and users' requirements for optical systems are also getting higher and higher. Especially for vehicle-mounted optical systems installed in automobiles, with the improvement of equipment integration, it is required that the vehicle-mounted optical system has a smaller size for fitting installation. At the same time, the vehicle-mounted optical system has relatively high requirements for resolution. The existing vehicle-mounted optical systems are prone to large aberrations at small sizes, resulting in poor imaging quality. In addition, the small-sized vehicle-mounted optical systems are prone to less light input, and the imaging quality is poor in a dim environment, which is likely to affect driving safety. Therefore, how to control the optical parameters of the front lens of the vehicle-mounted optical system and take into account small aberrations on the premise of miniaturization is a very important issue. Summary of the Invention

[0003] The main object of the present invention is to provide a vehicle-mounted optical system and a vehicle-mounted lens module to solve the problem that it is difficult to balance miniaturization and small aberrations in the existing vehicle-mounted optical systems.

[0004] To achieve the above object, according to one aspect of the present invention, a vehicle-mounted optical system is provided. The vehicle-mounted optical system only has six lenses, and all six lenses are spherical lenses. Sequentially from the object side to the image side of the vehicle-mounted optical system, it includes: a first lens, the first lens has a negative optical power, the object side surface of the first lens is convex, and the image side surface of the first lens is concave; a second lens, the second lens has a positive optical power; a third lens, the third lens has an optical power, and the image side surface of the third lens is convex; a fourth lens, the fourth lens has an optical power; a fifth lens, the fifth lens has an optical power, and the image side surface of the fifth lens is convex; a sixth lens, the sixth lens has an optical power; wherein, the distance TTL along the optical axis direction of the vehicle-mounted optical system from the object side surface of the first lens to the imaging surface of the vehicle-mounted optical system and the image height ImgH of the vehicle-mounted optical system satisfy: 5.3 < TTL / ImgH < 6.8; the effective focal length f1 of the first lens and the effective focal length f of the vehicle-mounted optical system satisfy: -2.7 < f1 / f < -0.9; the effective focal length f2 of the second lens and the effective focal length f of the vehicle-mounted optical system satisfy: 1.3 < f2 / f < 4.1; the refractive index N1 of the first lens, the refractive index N2 of the second lens, the Abbe number V1 of the first lens, and the Abbe number V2 of the second lens satisfy: 20 ≤ (V1 + V2) / (N1 + N2) < 30.

[0005] According to another aspect of the present invention, there is provided a vehicle-mounted optical system. The vehicle-mounted optical system only has six lenses, and all six lenses are spherical lenses. Sequentially from the object side to the image side of the vehicle-mounted optical system, it includes: a first lens, the first lens has a negative optical power, the object side surface of the first lens is convex, and the image side surface of the first lens is concave; a second lens, the second lens has a positive optical power; a third lens, the third lens has an optical power, and the image side surface of the third lens is convex; a fourth lens, the fourth lens has an optical power; a fifth lens, the fifth lens has an optical power, and the image side surface of the fifth lens is convex; a sixth lens, the sixth lens has an optical power; wherein, the distance TTL from the object side surface of the first lens to the imaging surface of the vehicle-mounted optical system along the optical axis direction of the vehicle-mounted optical system and the image height ImgH of the vehicle-mounted optical system satisfy: 5.3 < TTL / ImgH < 6.8; the effective focal length f1 of the first lens and the effective focal length f of the vehicle-mounted optical system satisfy: -2.7 < f1 / f < -0.9; the effective focal length f2 of the second lens and the effective focal length f of the vehicle-mounted optical system satisfy: 1.3 < f2 / f < 4.1; the central thickness CT1 of the first lens and the central thickness CT2 of the second lens satisfy: 0.1 < CT1 / CT2 < 0.6, and the central thickness CT1 of the first lens, the central thickness CT2 of the second lens, and the distance T12 on the optical axis from the image side surface of the first lens to the object side surface of the second lens satisfy: 0.4 < (CT1 + CT2) / T12 < 2.1. The present application provides a six-piece vehicle-mounted optical system. Under the condition of satisfying 5.3 < TTL / ImgH < 6.8, the volume of the vehicle-mounted optical system is relatively small, which can better meet the requirements of vehicle-mounted devices for miniaturization. However, the compression of the volume of the vehicle-mounted optical system also leads to relatively large aberrations. And in the present application, by restricting the effective focal lengths, central thicknesses, axial distances of the first lens and the second lens, and the effective focal length of the vehicle-mounted optical system, the deflection effect of the first lens and the second lens on light is controlled. Combining the collocation method of the negative and positive optical powers of the first lens and the second lens is beneficial to reducing aberrations such as spherical aberration, chromatic aberration, and distortion, and can also converge large-angle light to improve the brightness of the vehicle-mounted optical system and enhance the imaging quality of the vehicle-mounted optical system. It can also increase the strength of the first lens and the second lens, ensure the mechanical reliability and stability, effectively weaken the water mist problem, and ensure the imaging stability of the vehicle-mounted optical system.

[0006] Further, the central thickness CT1 of the first lens and the central thickness CT2 of the second lens satisfy: 0.1 < CT1 / CT2 < 0.6, and the central thickness CT1 of the first lens, the central thickness CT2 of the second lens, and the distance T12 on the optical axis from the image side surface of the first lens to the object side surface of the second lens satisfy: 0.4 < (CT1 + CT2) / T12 < 2.1.

[0007] Further, the following condition is satisfied between the maximum effective radius SD2 of the image side of the first lens and the maximum effective radius SD3 of the object side of the second lens: 0.9 < SD2 / SD3 < 1.3.

[0008] Further, the following condition is satisfied between the distance T45 on the optical axis from the image side of the fourth lens to the object side of the fifth lens and the sum ∑AT of the air gaps on the optical axis between any two adjacent lenses among the six lenses: 0 < T45 / ∑AT < 0.1.

[0009] Further, the following condition is satisfied between the curvature radius R3 of the object side of the second lens and the curvature radius R4 of the image side of the second lens: -1.5 < (R3 + R4) / (R3 - R4) < 3.0.

[0010] Further, the following condition is satisfied between the maximum effective radius SD6 of the image side of the third lens, the maximum effective radius SD10 of the image side of the fifth lens, and the maximum effective radius SD8 of the image side of the fourth lens: 1.7 < (SD6 + SD10) / SD8 < 2.1, and the following condition is satisfied between the central thickness CT3 of the third lens, the central thickness CT5 of the fifth lens, and the central thickness CT4 of the fourth lens: 1.1 < (CT3 + CT5) / CT4 < 12.5.

[0011] Further, the following condition is satisfied between the curvature radius R5 of the object side of the third lens, the curvature radius R6 of the image side of the third lens, the curvature radius R7 of the object side of the fourth lens, and the curvature radius R8 of the object side of the fourth lens: |(R5 + R6) / (R7 + R8)| < 4.7, and the following condition is satisfied between the effective focal length f3 of the third lens and the effective focal length f4 of the fourth lens: -2.5 < f3 / f4 < 2.7.

[0012] Further, the following condition is satisfied between the central thickness CT6 of the sixth lens and the central thickness CT5 of the fifth lens: 1.1 < CT6 / CT5 < 6.9, and the following condition is satisfied between the curvature radius R11 of the object side of the sixth lens and the curvature radius R10 of the image side of the fifth lens: -2.3 < (R11 + R10) / (R11 - R10) < 0.3.

[0013] Further, the following condition is satisfied between the distance Td on the optical axis from the object side of the first lens to the image side of the sixth lens and the distance Tr5r10 on the optical axis from the object side of the third lens to the image side of the fifth lens: 3.0 < Td / Tr5r10 < 4.5.

[0014] According to another aspect of the present invention, a vehicle-mounted lens module is provided. The vehicle-mounted lens module includes the above-mentioned vehicle-mounted optical system and a photosensitive chip, and the photosensitive chip is disposed on the image side of the vehicle-mounted optical system.

[0015] Applying the technical solution of the present invention, the vehicle-mounted optical system only has six lenses, and all six lenses are spherical lenses. Sequentially from the object side to the image side of the vehicle-mounted optical system, there are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens has a negative focal power. The object side surface of the first lens is convex, and the image side surface of the first lens is concave. The second lens has a positive focal power. The third lens has a focal power, and the image side surface of the third lens is convex. The fourth lens has a focal power. The fifth lens has a focal power, and the image side surface of the fifth lens is convex. The sixth lens has a focal power. Among them, the distance TTL from the object side surface of the first lens to the imaging surface of the vehicle-mounted optical system along the optical axis direction of the vehicle-mounted optical system and the image height ImgH of the vehicle-mounted optical system satisfy: 5.3 < TTL / ImgH < 6.8. The effective focal length f1 of the first lens and the effective focal length f of the vehicle-mounted optical system satisfy: -2.7 < f1 / f < -0.9. The effective focal length f2 of the second lens and the effective focal length f of the vehicle-mounted optical system satisfy: 1.3 < f2 / f < 4.1. The refractive index N1 of the first lens, the refractive index N2 of the second lens, the Abbe number V1 of the first lens, and the Abbe number V2 of the second lens satisfy: 20 ≤ (V1 + V2) / (N1 + N2) < 30.

[0016] This application provides a six-piece vehicle-mounted optical system. Under the condition of satisfying 5.3 < TTL / ImgH < 6.8, the volume of the vehicle-mounted optical system is relatively small, which can better meet the miniaturization requirements of vehicle-mounted devices. However, the compression of the volume of the vehicle-mounted optical system also leads to relatively large aberrations. And in this application, by restricting the effective focal lengths, refractive indices of the first lens and the second lens, and the effective focal length of the vehicle-mounted optical system, the deflection effect of the first lens and the second lens on light is controlled. Combining with the collocation method of the negative and positive focal powers of the first lens and the second lens, it is beneficial to reduce aberrations such as spherical aberration, chromatic aberration, and distortion, and can also converge large-angle light to improve the brightness of the vehicle-mounted optical system and enhance the imaging quality of the vehicle-mounted optical system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0018] Figure 1 It shows a partial parameter schematic diagram of the vehicle-mounted optical system of an optional embodiment of the present invention;

[0019] Figure 2 It shows a structural schematic diagram of the vehicle-mounted optical system of Embodiment 1 of the present invention;

[0020] Figures 3 to 5 Respectively show Figure 2The axial chromatic aberration curve, astigmatism curve, and distortion curve of the vehicle-mounted optical system in

[0021] Figure 6 FIG. shows a schematic structural diagram of the vehicle-mounted optical system according to Embodiment 2 of the present invention;

[0022] Figures 7 to 9 respectively show Figure 6 The axial chromatic aberration curve, astigmatism curve, and distortion curve of the vehicle-mounted optical system in

[0023] Figure 10 FIG. shows a schematic structural diagram of the vehicle-mounted optical system according to Embodiment 3 of the present invention;

[0024] Figures 11 to 13 respectively show Figure 10 The axial chromatic aberration curve, astigmatism curve, and distortion curve of the vehicle-mounted optical system in

[0025] Figure 14 FIG. shows a schematic structural diagram of the vehicle-mounted optical system according to Embodiment 1 of the present invention;

[0026] Figures 15 to 17 respectively show Figure 14 The axial chromatic aberration curve, astigmatism curve, and distortion curve of the vehicle-mounted optical system in

[0027] Among them, the above-mentioned drawings include the following reference numerals:

[0028] STO, aperture stop; E1, first lens; S1, object side of the first lens; S2, image side of the first lens; E2, second lens; S3, object side of the second lens; S4, image side of the second lens; E3, third lens; S5, object side of the third lens; S6, image side of the third lens; E4, fourth lens; S7, object side of the fourth lens; S8, image side of the fourth lens; E5, fifth lens; S9, object side of the fifth lens; S10, image side of the fifth lens; E6, sixth lens; S11, object side of the sixth lens; S12, image side of the sixth lens; FILTER, filter; S13, object side of the filter; S14, image side of the filter; IMG, imaging surface. Detailed implementation manners

[0029] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0030] It should be pointed out that unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs.

[0031] In the present invention, unless otherwise specified, the orientation terms such as "upper, lower, top, bottom" generally refer to the directions shown in the drawings or to the directions of the components themselves in the vertical, perpendicular or gravitational directions; similarly, for the convenience of understanding and description, "inner, outer" refer to the inner and outer of the contours of the respective components themselves, but the above orientation terms are not used to limit the present invention.

[0032] It should be noted that in this specification, the expressions such as first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teachings of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0033] In the drawings, for the convenience of illustration, the thickness, size and shape of the lens have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0034] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closer to the object side becomes the object side surface of the lens, and the surface of each lens closer to the image side is called the image side surface of the lens. The judgment of the surface shape in the paraxial region can be based on the judgment method of those with ordinary knowledge in the field, and the positive and negative of the R value (R refers to the radius of curvature in the paraxial region, usually the R value on the lens database in optical software) is used to judge the convexity and concavity. For the object side surface, when the R value is positive, it is judged to be convex, and when the R value is negative, it is judged to be concave; for the image side surface, when the R value is positive, it is judged to be concave, and when the R value is negative, it is judged to be convex.

[0035] To solve the problem in the prior art that it is difficult to balance the miniaturization and small aberration of in-vehicle optical systems, the present invention provides an in-vehicle optical system and an in-vehicle lens module.

[0036] First Embodiment

[0037] As Figures 1 to 17As shown, the vehicle-mounted optical system only has six lenses, and all six lenses are spherical lenses. Sequentially from the object side to the image side of the vehicle-mounted optical system, it includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens has a negative optical power, the object side surface of the first lens is convex, and the image side surface of the first lens is concave; the second lens has a positive optical power; the third lens has an optical power, and the image side surface of the third lens is convex; the fourth lens has an optical power; the fifth lens has an optical power, and the image side surface of the fifth lens is convex; the sixth lens has an optical power; wherein, the distance TTL from the object side surface of the first lens to the imaging surface of the vehicle-mounted optical system along the optical axis direction of the vehicle-mounted optical system and the image height ImgH of the vehicle-mounted optical system satisfy: 5.3 < TTL / ImgH < 6.8; the effective focal length f1 of the first lens and the effective focal length f of the vehicle-mounted optical system satisfy: -2.7 < f1 / f < -0.9; the effective focal length f2 of the second lens and the effective focal length f of the vehicle-mounted optical system satisfy: 1.3 < f2 / f < 4.1; the refractive index N1 of the first lens, the refractive index N2 of the second lens, the Abbe number V1 of the first lens, and the Abbe number V2 of the second lens satisfy: 20 ≤ (V1 + V2) / (N1 + N2) < 30.

[0038] This application provides a six-piece vehicle-mounted optical system. Under the condition of satisfying 5.3 < TTL / ImgH < 6.8, the volume of the vehicle-mounted optical system is relatively small, which can better meet the miniaturization requirements of vehicle-mounted devices. However, the compression of the volume of the vehicle-mounted optical system also leads to relatively large aberrations. And in this application, by restricting the effective focal lengths, refractive indices of the first lens and the second lens, and the effective focal length of the vehicle-mounted optical system, the deflection effect of the first lens and the second lens on light is controlled. Combining with the collocation method of the negative and positive optical powers of the first lens and the second lens, it is beneficial to reduce aberrations such as spherical aberration, chromatic aberration, and distortion, and can also converge large-angle light to improve the brightness of the vehicle-mounted optical system and enhance the imaging quality of the vehicle-mounted optical system.

[0039] Preferably, 5.4 < TTL / ImgH < 6.7.

[0040] Preferably, -2.6 < f1 / f < -1.0.

[0041] Preferably, 1.4 < f2 / f < 4.0.

[0042] Preferably, 20 ≤ (V1 + V2) / (N1 + N2) < 29.5.

[0043] In this embodiment, the center thickness CT1 of the first lens and the center thickness CT2 of the second lens satisfy: 0.1 < CT1 / CT2 < 0.6, and the center thickness CT1 of the first lens, the center thickness CT2 of the second lens, and the distance T12 on the optical axis from the image side of the first lens to the object side of the second lens satisfy: 0.4 < (CT1 + CT2) / T12 < 2.1. By limiting CT1 / CT2 and (CT1 + CT2) / T12 within a reasonable range, the strength of the first lens can be increased, the mechanical reliability stability can be ensured, and at the same time, by controlling the distance T12 on the optical axis from the image side of the first lens to the object side of the second lens, the water mist problem can be effectively reduced, and the imaging stability of the vehicle-mounted optical system can be ensured. Preferably, 0.12 < CT1 / CT2 < 0.56, 0.45 < (CT1 + CT2) / T12 < 2.05.

[0044] In this embodiment, the maximum effective radius SD2 of the image side of the first lens and the maximum effective radius SD3 of the object side of the second lens satisfy: 0.9 < SD2 / SD3 < 1.3. By limiting SD2 / SD3 within a reasonable range, the position of the sealing ring of the vehicle-mounted optical system can be reserved, the airtightness of the vehicle-mounted optical system can be ensured, water vapor can be prevented from generating, and the imaging effect can be avoided from being affected. Preferably, 0.95 < SD2 / SD3 < 1.28.

[0045] In this embodiment, the distance T45 on the optical axis from the image side of the fourth lens to the object side of the fifth lens and the sum ∑AT of the air gaps on the optical axis between any two adjacent lenses among the six lenses satisfy: 0 < T45 / ∑AT < 0.1. By limiting T45 / ∑AT within a reasonable range, it is beneficial to control the distance between the fourth lens and the fifth lens, and further beneficial to effectively reduce the overall height of the vehicle-mounted optical system. Preferably, 0 < T45 / ∑AT < 0.08.

[0046] In this embodiment, the curvature radius R3 of the object side of the second lens and the curvature radius R4 of the image side of the second lens satisfy: -1.5 < (R3 + R4) / (R3 - R4) < 3.0. By limiting (R3 + R4) / (R3 - R4) within a reasonable range, the processability of the second lens can be effectively ensured, the grinding yield of the second lens can be increased, and the cost can be reduced. Preferably, -1.45 < (R3 + R4) / (R3 - R4) < 2.95.

[0047] In this embodiment, the following relationships are satisfied among the maximum effective radius SD6 of the image side surface of the third lens, the maximum effective radius SD10 of the image side surface of the fifth lens, and the maximum effective radius SD8 of the image side surface of the fourth lens: 1.7 < (SD6 + SD10) / SD8 < 2.1. The following relationships are satisfied among the central thickness CT3 of the third lens, the central thickness CT5 of the fifth lens, and the central thickness CT4 of the fourth lens: 1.1 < (CT3 + CT5) / CT4 < 12.5. By limiting (SD6 + SD10) / SD8 and (CT3 + CT5) / CT4 within reasonable ranges, the sizes of the third, fourth, and fifth lenses in the radial direction can be effectively controlled, ensuring the processability of the spherical lens. At the same time, by controlling the central thicknesses of the third, fourth, and fifth lenses, the overall height of the vehicle-mounted optical system can be effectively controlled, further ensuring the processability of the spherical lens. Preferably, 1.75 < (SD6 + SD10) / SD8 < 2.07, 1.2 < (CT3 + CT5) / CT4 < 12.4.

[0048] In this embodiment, the following relationship is satisfied among the curvature radius R5 of the object side surface of the third lens, the curvature radius R6 of the image side surface of the third lens, the curvature radius R7 of the object side surface of the fourth lens, and the curvature radius R8 of the object side surface of the fourth lens: |(R5 + R6) / (R7 + R8)| < 4.7. The following relationship is satisfied between the effective focal length f3 of the third lens and the effective focal length f4 of the fourth lens: -2.5 < f3 / f4 < 2.7. By limiting |(R5 + R6) / (R7 + R8)| and f3 / f4 within reasonable ranges, the sensitivity of the vehicle-mounted optical system can be reduced, while ensuring the processability of the third and fourth lenses. At the same time, by controlling the effective focal lengths of the third and fourth lenses, it is beneficial to reduce the overall aberration of the vehicle-mounted optical system. Preferably, 0.05 < |(R5 + R6) / (R7 + R8)| < 4.65, -2.4 < f3 / f4 < 2.6.

[0049] In this embodiment, the following relationship is satisfied between the central thickness CT6 of the sixth lens and the central thickness CT5 of the fifth lens: 1.1 < CT6 / CT5 < 6.9. The following relationship is satisfied between the curvature radius R11 of the object side surface of the sixth lens and the curvature radius R10 of the image side surface of the fifth lens: -2.3 < (R11 + R10) / (R11 - R10) < 0.3. By limiting CT6 / CT5 and (R11 + R10) / (R11 - R10) within reasonable ranges, the overall height of the vehicle-mounted optical system can be effectively controlled, while ensuring the processability of the fifth and sixth lenses. Also, by controlling the curvature radii of the sixth and fifth lenses, the aberration of the vehicle-mounted optical system can be reduced, improving the performance quality. Preferably, 1.2 < CT6 / CT5 < 6.8, -2.2 < (R11 + R10) / (R11 - R10) < 0.2.

[0050] In this embodiment, the distance Td on the optical axis from the object side surface of the first lens to the image side surface of the sixth lens and the distance Tr5r10 on the optical axis from the object side surface of the third lens to the image side surface of the fifth lens satisfy: 3.0 < Td / Tr5r10 < 4.5. By restricting Td / Tr5r10 within a reasonable range, it is beneficial to constrain the thickness of the rear-end lens, ensuring the processing yield of the lens while meeting the miniaturization requirements. Preferably, 3.2 < Td / Tr5r10 < 4.3.

[0051] This embodiment also provides a vehicle-mounted lens module. The vehicle-mounted lens module includes the above-described vehicle-mounted optical system and an image sensor chip, and the image sensor chip is disposed on the image side of the vehicle-mounted optical system.

[0052] Second Embodiment

[0053] As Figures 1 to 17 shown, the vehicle-mounted optical system only has six lenses, and all six lenses are spherical lenses. Sequentially from the object side to the image side of the vehicle-mounted optical system, there are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens has a negative optical power, the object side surface of the first lens is convex, and the image side surface of the first lens is concave; the second lens has a positive optical power; the third lens has an optical power, and the image side surface of the third lens is convex; the fourth lens has an optical power; the fifth lens has an optical power, and the image side surface of the fifth lens is convex; the sixth lens has an optical power; wherein, the distance TTL on the optical axis of the vehicle-mounted optical system from the object side surface of the first lens to the imaging surface and the image height ImgH of the vehicle-mounted optical system satisfy: 5.3 < TTL / ImgH < 6.8; the effective focal length f1 of the first lens and the effective focal length f of the vehicle-mounted optical system satisfy: -2.7 < f1 / f < -0.9; the effective focal length f2 of the second lens and the effective focal length f of the vehicle-mounted optical system satisfy: 1.3 < f2 / f < 4.1; the central thickness CT1 of the first lens and the central thickness CT2 of the second lens satisfy: 0.1 < CT1 / CT2 < 0.6, and the central thickness CT1 of the first lens, the central thickness CT2 of the second lens, and the distance T12 on the optical axis from the image side surface of the first lens to the object side surface of the second lens satisfy: 0.4 < (CT1 + CT2) / T12 < 2.1.

[0054] The present application provides a six-piece vehicle-mounted optical system. Under the condition of satisfying 5.3 < TTL / ImgH < 6.8, the volume of the vehicle-mounted optical system is relatively small, which can better meet the miniaturization requirements of vehicle-mounted devices. However, the compression of the volume of the vehicle-mounted optical system also leads to relatively large aberrations. In this application, by restricting the effective focal lengths, central thicknesses, axial distances of the first lens and the second lens, and the effective focal length of the vehicle-mounted optical system, the deflection effect of the first lens and the second lens on light is controlled. Combining with the combination of the negative and positive optical powers of the first lens and the second lens is beneficial to reducing aberrations such as spherical aberration, chromatic aberration, and distortion, and can also converge large-angle light to improve the brightness of the vehicle-mounted optical system and enhance the imaging quality of the vehicle-mounted optical system. It can also increase the strength of the first lens and the second lens, ensure the stability of mechanical reliability, effectively weaken the water mist problem, and ensure the imaging stability of the vehicle-mounted optical system.

[0055] Preferably, 5.4 < TTL / ImgH < 6.7.

[0056] Preferably, -2.6 < f1 / f < -1.0.

[0057] Preferably, 1.4 < f2 / f < 4.0.

[0058] Preferably, 0.12 < CT1 / CT2 < 0.56.

[0059] Preferably, 0.45 < (CT1 + CT2) / T12 < 2.05.

[0060] It should be noted that this embodiment may also include other conditional expressions and vehicle-mounted lens modules in the first embodiment, which will not be elaborated here one by one.

[0061] Optionally, the above vehicle-mounted optical system may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0062] In the vehicle-mounted optical system of the present application, multiple lenses can be used, such as the six pieces mentioned above. By reasonably distributing the optical powers, surface shapes, central thicknesses of each lens, and axial distances between each lens, etc., the aperture of the vehicle-mounted optical system can be effectively increased, the sensitivity of the lens can be reduced, and the processability of the lens can be improved, making the vehicle-mounted optical system more conducive to production and processing and applicable to portable electronic devices such as smart phones.

[0063] Such as Figure 1 shows a partial parameter schematic diagram of the vehicle-mounted optical system.

[0064] Next, with reference to the drawings, specific surface shapes and parameter examples of the vehicle-mounted optical system applicable to the above embodiments will be further described.

[0065] It should be noted that any one of the following Examples 1 to 4 is applicable to all embodiments of the present application.

[0066] Example 1

[0067] As Figures 2 to 5 shown, the vehicle-mounted optical system of Example 1 of the present application is described. Figure 2 The schematic structural diagram of the vehicle-mounted optical system of Example 1 is shown.

[0068] As Figure 2 shown, the vehicle-mounted optical system sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter FILTER, and an imaging surface IMG.

[0069] The first lens E1 has a negative optical power. The object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has a positive optical power. The object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is convex. The third lens E3 has a positive optical power. The object side surface S5 of the third lens is concave, and the image side surface S6 of the third lens is convex. The fourth lens E4 has a negative optical power. The object side surface S6 of the fourth lens is concave, and the image side surface S8 of the fourth lens is concave. The fifth lens E5 has a positive optical power. The object side surface S9 of the fifth lens is concave, and the image side surface S10 of the fifth lens is convex. The sixth lens E6 has a positive optical power. The object side surface S11 of the sixth lens is convex, and the image side surface S12 of the sixth lens is convex. The filter FILTER has an object side surface S13 of the filter and an image side surface S14 of the filter. The light from the object sequentially passes through the surfaces S1 to S14 and finally forms an image on the imaging surface IMG.

[0070] It should be noted that in this embodiment, the third lens and the fourth lens are cemented to form a cemented lens. Therefore, the image side surface of the third lens and the object side surface of the fourth lens are both S6 but have opposite surface shapes. However, the image side surface of the third lens is convex, and the object side surface of the fourth lens is concave. The cemented lens can further reduce the field curvature, correct the off-axis aberrations of the vehicle-mounted optical system, fully correct various aberrations of the vehicle-mounted optical system, and can improve the resolution and optimize optical performances such as distortion and CRA (chief ray angle) on the premise of a compact structure.

[0071] Table 1 shows the basic structural parameter table of the vehicle-mounted optical system of Example 1, where the units of the radius of curvature, thickness / distance, and semi-aperture are all millimeters (mm).

[0072]

[0073]

[0074] Table 1

[0075] Figure 3 Fig. 5 shows the axial chromatic aberration curve of the vehicle-mounted optical system of the first embodiment, which represents the deviation of the focus points of light rays with different wavelengths after passing through the vehicle-mounted optical system. Figure 4 Fig. 6 shows the astigmatism curve of the vehicle-mounted optical system of the first embodiment, which represents the curvature of the meridional image plane and the sagittal image plane. Figure 5 Fig. 7 shows the distortion curve of the vehicle-mounted optical system of the first embodiment, which represents the distortion values corresponding to different field angles.

[0076] According to Figures 3 to 5 it can be seen that the vehicle-mounted optical system given in the first embodiment can achieve good imaging quality.

[0077] Second Embodiment

[0078] As Figures 6 to 9 shown, the vehicle-mounted optical system of the second embodiment of the present application is described. Figure 6 Fig. 8 shows a schematic structural diagram of the vehicle-mounted optical system of the second embodiment.

[0079] As Figure 6 shown, the vehicle-mounted optical system sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter FILTER, and an imaging surface IMG.

[0080] The first lens E1 has a negative optical power. The object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has a positive optical power. The object side surface S3 of the second lens is concave, and the image side surface S4 of the second lens is convex. The third lens E3 has a positive optical power. The object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is convex. The fourth lens E4 has a negative optical power. The object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is concave. The fifth lens E5 has a positive optical power. The object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is convex. The sixth lens E6 has a negative optical power. The object side surface S11 of the sixth lens is concave, and the image side surface S12 of the sixth lens is concave. The filter FILTER has an object side surface S13 of the filter and an image side surface S14 of the filter. Light from the object sequentially passes through the surfaces S1 to S14 and finally forms an image on the imaging surface IMG.

[0081] Table 2 shows the basic structural parameter table of the vehicle-mounted optical system of the second embodiment, where the units of the radius of curvature, thickness / distance, and semi-aperture are all millimeters (mm).

[0082]

[0083]

[0084] Table 2

[0085] Figure 7 shows the axial chromatic aberration curve of the vehicle-mounted optical system of the second embodiment, which represents the deviation of the focusing points of light rays with different wavelengths after passing through the vehicle-mounted optical system. Figure 8 shows the astigmatism curve of the vehicle-mounted optical system of the second embodiment, which represents the curvature of the meridional image plane and the sagittal image plane. Figure 9 shows the distortion curve of the vehicle-mounted optical system of the second embodiment, which represents the distortion magnitude values corresponding to different field angles.

[0086] According to Figures 7 to 9 it can be seen that the vehicle-mounted optical system given in the second embodiment can achieve good imaging quality.

[0087] Embodiment Three

[0088] As Figures 10 to 13 shown, the vehicle-mounted optical system of the third embodiment of the present application is described. Figure 10 shows a schematic structural diagram of the vehicle-mounted optical system of the third embodiment.

[0089] As Figure 10 shown, the vehicle-mounted optical system sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter FILTER, and an imaging surface IMG.

[0090] The first lens E1 has a negative optical power. The object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has a positive optical power. The object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is convex. The third lens E3 has a negative optical power. The object side surface S5 of the third lens is concave, and the image side surface S6 of the third lens is convex. The fourth lens E4 has a positive optical power. The object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is convex. The fifth lens E5 has a positive optical power. The object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is convex. The sixth lens E6 has a negative optical power. The object side surface S11 of the sixth lens is concave, and the image side surface S12 of the sixth lens is convex. The filter FILTER has an object side surface S13 of the filter and an image side surface S14 of the filter. Light from the object sequentially passes through each surface S1 to S14 and finally forms an image on the imaging surface IMG.

[0091] Table 3 shows the basic structural parameter table of the vehicle-mounted optical system of the third embodiment, where the units of the radius of curvature, thickness / distance, and semi-aperture are all millimeters (mm).

[0092]

[0093]

[0094] Table 3

[0095] Figure 11 shows the axial chromatic aberration curve of the vehicle-mounted optical system in the third embodiment, which represents the deviation of the focusing points of light rays with different wavelengths after passing through the vehicle-mounted optical system. Figure 12 shows the astigmatism curve of the vehicle-mounted optical system in the third embodiment, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 13 shows the distortion curve of the vehicle-mounted optical system in the third embodiment, which represents the distortion magnitude values corresponding to different field angles.

[0096] According to Figures 11 to 13 it can be seen that the vehicle-mounted optical system given in the third embodiment can achieve good imaging quality.

[0097] Embodiment 4

[0098] As Figures 14 to 17 shown, the vehicle-mounted optical system of the fourth embodiment of the present application is described. Figure 14 shows a schematic structural diagram of the vehicle-mounted optical system in the fourth embodiment.

[0099] As Figure 14 shown, the vehicle-mounted optical system sequentially includes, from the object side to the image side: a first lens E1, a second lens E2, a diaphragm STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter FILTER, and an imaging surface IMG.

[0100] The first lens E1 has a negative optical power. The object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The second lens E2 has a positive optical power. The object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has a positive optical power. The object side surface S5 of the third lens is concave, and the image side surface S6 of the third lens is convex. The fourth lens E4 has a positive optical power. The object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is convex. The fifth lens E5 has a negative optical power. The object side surface S9 of the fifth lens is concave, and the image side surface S10 of the fifth lens is convex. The sixth lens E6 has a positive optical power. The object side surface S11 of the sixth lens is convex, and the image side surface S12 of the sixth lens is concave. The filter FILTER has an object side surface S13 of the filter and an image side surface S14 of the filter. Light from the object sequentially passes through the surfaces S1 to S14 and finally forms an image on the imaging surface IMG.

[0101] Table 4 shows the basic structural parameter table of the vehicle-mounted optical system in the fourth embodiment. Among them, the units of the radius of curvature, thickness / distance, and semi-aperture are all millimeters (mm).

[0102]

[0103]

[0104] Table 4

[0105] Figure 15 shows the axial chromatic aberration curve of the vehicle-mounted optical system in the fourth embodiment, which represents the deviation of the convergence points of light rays with different wavelengths after passing through the vehicle-mounted optical system. Figure 16 shows the astigmatism curve of the vehicle-mounted optical system in the fourth embodiment, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 17 shows the distortion curve of the vehicle-mounted optical system in the fourth embodiment, which represents the distortion magnitude values corresponding to different field angles.

[0106] According to Figures 15 to 17 it can be known that the vehicle-mounted optical system given in the fourth embodiment can achieve good imaging quality.

[0107] In summary, Embodiments 1 to 4 respectively satisfy the relationships shown in Table 5.

[0108] Conditional / Example Example 1 Example 2 Example 3 Example 4 TTL / IMGH 5.825 5.446 6.489 6.667 f1 / f -1.602 -2.545 -1.231 -1.188 f2 / f 1.662 3.965 1.478 3.642 (V1 + V2) / (N1 + N2) 24.23 22.25 29.03 20.07 CT1 / CT2 0.366 0.148 0.496 0.286 (CT1 + CT2) / T12 0.880 0.847 0.593 1.928 SD2 / SD3 1.222 1.248 0.983 1.036 T45 / ∑AT 0.071 0.042 0.004 0.006 (R3 + R4) / (R3 - R4) -0.340 2.913 0.211 -1.350 (SD6 + SD10) / SD8 1.935 2.038 1.848 1.878 (CT3 + CT5) / CT4 5.929 12.316 1.528 1.329 |(R5 + R6) / (R7 + R8)| 1.262 0.250 0.116 4.597 f3 / f4 -1.929 -0.431 -2.370 2.534 CT6 / CT5 3.031 1.213 1.410 6.750 (R11 + R10) / (R11 - R10) 0.173 -2.187 -1.904 -0.624 Td / Tr5r10 3.554 3.291 3.555 4.210

[0109] Table 5

[0110] Table 6 gives the effective focal length f of the vehicle-mounted optical systems in Embodiments 1 to 4, and the effective focal lengths f1 to f6 of each lens.

[0111]

[0112]

[0113] Table 6

[0114] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0115] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0116] It should be noted that the terms "first", "second", etc. in the description and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application described herein can be implemented in an order different from those illustrated or described herein.

[0117] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An in-vehicle optical system, characterized in that, the in-vehicle optical system only has six lenses, and all the six lenses are spherical lenses, and sequentially include, along the object side to the image side of the in-vehicle optical system: a first lens, the first lens having a negative optical power, the object side surface of the first lens being convex, and the image side surface of the first lens being concave; a second lens, the second lens having a positive optical power; a third lens, the third lens having an optical power, the image side surface of the third lens being convex; a fourth lens, the fourth lens having an optical power; a fifth lens, the fifth lens having an optical power, the image side surface of the fifth lens being convex; a sixth lens, the sixth lens having an optical power; wherein, the distance TTL from the object side surface of the first lens to the imaging surface of the in-vehicle optical system along the optical axis direction of the in-vehicle optical system and the image height ImgH of the in-vehicle optical system satisfy: 5.3 < TTL / ImgH < 6.8; the effective focal length f1 of the first lens and the effective focal length f of the in-vehicle optical system satisfy: -2.7 < f1 / f < -0.9; the effective focal length f2 of the second lens and the effective focal length f of the in-vehicle optical system satisfy: 1.3 < f2 / f < 4.1; the refractive index N1 of the first lens, the refractive index N2 of the second lens, the Abbe number V1 of the first lens, and the Abbe number V2 of the second lens satisfy: 20 ≤ (V1 + V2) / (N1 + N2) < 30.

2. The in-vehicle optical system according to claim 1, characterized in that, the central thickness CT1 of the first lens and the central thickness CT2 of the second lens satisfy: 0.1 < CT1 / CT2 < 0.6, and the central thickness CT1 of the first lens, the central thickness CT2 of the second lens, and the distance T12 on the optical axis from the image side surface of the first lens to the object side surface of the second lens satisfy: 0.4 < (CT1 + CT2) / T12 < 2.

1.

3. The in-vehicle optical system according to claim 1, characterized in that, the maximum effective radius SD2 of the image side surface of the first lens and the maximum effective radius SD3 of the object side surface of the second lens satisfy: 0.9 < SD2 / SD3 < 1.

3.

4. The in-vehicle optical system according to claim 1, characterized in that, the distance T45 on the optical axis from the image side surface of the fourth lens to the object side surface of the fifth lens and the sum ∑AT of the air gaps on the optical axis between any two adjacent lenses among the six lenses satisfy: 0 < T45 / ∑AT < 0.

1.

5. The in-vehicle optical system according to claim 1, characterized in that, the curvature radius R3 of the object side surface of the second lens and the curvature radius R4 of the image side surface of the second lens satisfy: -1.5 < (R3 + R4) / (R3 - R4) < 3.

0.

6. The in-vehicle optical system according to claim 1, characterized in that, The maximum effective radius SD6 of the image side of the third lens, the maximum effective radius SD10 of the image side of the fifth lens, and the maximum effective radius SD8 of the image side of the fourth lens satisfy: 1.7 < (SD6 + SD10) / SD8 < 2.

1. The center thickness CT3 of the third lens, the center thickness CT5 of the fifth lens, and the center thickness CT4 of the fourth lens satisfy: 1.1 < (CT3 + CT5) / CT4 < 12.

5.

7. The vehicle-mounted optical system according to claim 1, characterized in that, the curvature radius R5 of the object side of the third lens, the curvature radius R6 of the image side of the third lens, the curvature radius R7 of the object side of the fourth lens, and the curvature radius R8 of the object side of the fourth lens satisfy: |(R5 + R6) / (R7 + R8)| < 4.

7. The effective focal length f3 of the third lens and the effective focal length f4 of the fourth lens satisfy: -2.5 < f3 / f4 < 2.

7.

8. The vehicle-mounted optical system according to claim 1, characterized in that, the center thickness CT6 of the sixth lens and the center thickness CT5 of the fifth lens satisfy: 1.1 < CT6 / CT5 < 6.

9. The curvature radius R11 of the object side of the sixth lens and the curvature radius R10 of the image side of the fifth lens satisfy: -2.3 < (R11 + R10) / (R11 - R10) < 0.

3.

9. The vehicle-mounted optical system according to claim 1, characterized in that, the distance Td on the optical axis from the object side of the first lens to the image side of the sixth lens and the distance Tr5r10 on the optical axis from the object side of the third lens to the image side of the fifth lens satisfy: 3.0 < Td / Tr5r10 < 4.

5.

10. A vehicle-mounted lens module, characterized in that, the vehicle-mounted lens module includes the vehicle-mounted optical system according to any one of claims 1 to 9 and an image sensor chip, and the image sensor chip is disposed on the image side of the vehicle-mounted optical system.

Images