Vehicle-mounted optical system and vehicle-mounted lens module

Abstract

The application 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 of the first lens to the imaging surface along the optical axis direction 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. The application solves the problem that the miniaturization and small aberration of the vehicle-mounted optical system are difficult to be considered in the prior art.

Description

Technical Field

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

[0002] With the development of technology and the increase of application demands, optical systems have been widely used in many devices, and users have increasingly higher requirements for optical systems. Especially for vehicle-mounted optical systems installed on automobiles, with the improvement of device integration, the vehicle-mounted optical systems are required to have a smaller size to fit the installation. At the same time, vehicle-mounted optical systems have high requirements for resolution. Existing vehicle-mounted optical systems are prone to large aberrations under a small size, resulting in poor imaging quality. In addition, small-volume vehicle-mounted optical systems tend to have less light intake, leading to poor imaging quality in environments with dim light, which easily affects driving safety. Therefore, how to control the optical parameters of the front lens of the vehicle-mounted optical system to achieve both miniaturization and relatively small aberrations is a very important issue. Summary of the Invention

[0003] The main purpose of the present invention is to provide a vehicle-mounted optical system and a vehicle-mounted lens module, so as to solve the problem in the prior art that it is difficult to balance the miniaturization and small aberration of the vehicle-mounted optical system.

[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 has only six lenses, all of which are spherical lenses, and sequentially includes from the object side to the image side of the vehicle-mounted optical system: a first lens, which has negative refractive power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; a second lens, which has positive refractive power; a third lens, which has refractive power, and the image side surface of the third lens is a convex surface; a fourth lens, which has refractive power; a fifth lens, which has refractive power, and the image side surface of the fifth lens is a convex surface; a sixth lens, which has refractive 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.

[0005] According to another aspect of the present invention, a vehicle-mounted optical system is provided. The vehicle-mounted optical system has only six lenses, all of which are spherical lenses. In order from the object side to the image side of the vehicle-mounted optical system, the six lenses include: a first lens having negative refractive power, the object side surface of the first lens being a convex surface, and the image side surface of the first lens being a concave surface; a second lens having positive refractive power; a third lens having refractive power, the image side surface of the third lens being a convex surface; a fourth lens having refractive power; a fifth lens having refractive power, the image side surface of the fifth lens being a convex surface; a sixth lens having refractive 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-lens vehicle-mounted optical system. Under the condition that 5.3<TTL / ImgH<6.8 is satisfied, the vehicle-mounted optical system has a relatively small volume, which can better meet the miniaturization requirement of vehicle-mounted devices. However, the reduction in the volume of the vehicle-mounted optical system also leads to relatively large aberrations. In the present application, by limiting the effective focal lengths, central thicknesses, on-axis distances of the first lens and the second lens, and the effective focal length of the vehicle-mounted optical system, the light deflection effect of the first lens and the second lens is controlled. Combined with the matching mode of the negative and positive refractive 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, thereby improving 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 reliability and stability of the mechanism, effectively reduce 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 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.

[0008] Further, 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 ΣAT of the air intervals on the optical axis between any two adjacent lenses among the six lenses satisfy: 0 < T45 / ΣAT < 0.1.

[0009] Further, 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.

[0010] Further, 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, and 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.

[0011] Further, 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, and 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.

[0012] Further, the center thickness CT6 of the sixth lens and the center thickness CT5 of the fifth lens satisfy: 1.1 < CT6 / CT5 < 6.9, and 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.

[0013] Further, 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.

[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 arranged on the image side of the vehicle-mounted optical system.

[0015] Applying the technical solution of the present invention, the vehicle-mounted optical system has only six lenses, all of which are spherical lenses. From the object side to the image side of the vehicle-mounted optical system, the six lenses sequentially include a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. The first lens has negative refractive power, the object side of the first lens is a convex surface, and the image side of the first lens is a concave surface; the second lens has positive refractive power; the third lens has refractive power, and the image side of the third lens is a convex surface; the fourth lens has refractive power; the fifth lens has refractive power, and the image side of the fifth lens is a convex surface; the sixth lens has refractive power. Wherein, the distance TTL from the object side of the first lens to the imaging plane 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] The present application provides a six-lens vehicle-mounted optical system. Under the condition that 5.3<TTL / ImgH<6.8 is satisfied, the vehicle-mounted optical system has a small volume, which can better adapt to the miniaturization requirement of vehicle-mounted equipment. However, the compression of the volume of the vehicle-mounted optical system also leads to large aberrations. In the present application, by limiting the effective focal lengths and refractive indices of the first lens and the second lens as well as the effective focal length of the vehicle-mounted optical system, the deflection effect of the first lens and the second lens on light rays is controlled. Combined with the matching mode of negative and positive refractive 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 rays 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 of the specification, which constitute a part of the present application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and the descriptions thereof are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

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

[0019] Figure 2 shows a schematic structural diagram of a vehicle-mounted optical system according to the first embodiment of the present invention;

[0020] Figures 3 to 5 respectively show Figure 2On-axis chromatic aberration curves, astigmatism curves, and distortion curves of the vehicle-mounted optical system;

[0021] Figure 6 A schematic diagram of the vehicle-mounted optical system according to Embodiment 2 of the present invention is shown;

[0022] Figures 7 to 9 They are shown respectively Figure 6 On-axis chromatic aberration curves, astigmatism curves, and distortion curves of the vehicle-mounted optical system;

[0023] Figure 10 A schematic diagram of the vehicle-mounted optical system according to Embodiment 3 of the present invention is shown;

[0024] Figures 11 to 13 They are shown respectively Figure 10 On-axis chromatic aberration curves, astigmatism curves, and distortion curves of the vehicle-mounted optical system;

[0025] Figure 14 A schematic diagram of the vehicle-mounted optical system according to Embodiment 1 of the present invention is shown;

[0026] Figures 15 to 17 They are shown respectively Figure 14 The on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the vehicle-mounted optical system.

[0027] The above figures include the following reference numerals:

[0028] STO, Aperture Stop; E1, First Lens; S1, Object-side Face of First Lens; S2, Image-side Face of First Lens; E2, Second Lens; S3, Object-side Face of Second Lens; S4, Image-side Face of Second Lens; E3, Third Lens; S5, Object-side Face of Third Lens; S6, Image-side Face of Third Lens; E4, Fourth Lens; S7, Object-side Face of Fourth Lens; S8, Image-side Face of Fourth Lens; E5, Fifth Lens; S9, Object-side Face of Fifth Lens; S10, Image-side Face of Fifth Lens; E6, Sixth Lens; S11, Object-side Face of Sixth Lens; S12, Image-side Face of Sixth Lens; FILTER, Filter; S13, Object-side Face of Filter; S14, Image-side Face of Filter; IMG, Imaging Surface. Detailed Implementation

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0031] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

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

[0033] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not drawn strictly to scale.

[0034] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity 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 location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object side is called the object-side surface of the lens, and the surface of each lens closest to the image side is called the image-side surface of the lens. The surface shape in the paraxial region can be determined according to the judgment method commonly used by those knowledgeable in the field, using the R value (R refers to the radius of curvature of the paraxial region, usually the R value in the lens database of optical software) to determine concavity or convexity. For the object-side surface, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; for the image-side surface, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

[0035] To address the challenge of balancing miniaturization and low aberrations in existing automotive optical systems, this invention provides an automotive optical system and an automotive lens module.

[0036] First Implementation Method

[0037] like Figures 1 to 17As shown, the vehicle-mounted optical system has only six lenses, all of which are spherical lenses. Along the direction from the object side to the image side of the vehicle-mounted optical system, the six lenses sequentially include a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. The first lens has negative refractive power, the object side of the first lens is a convex surface, and the image side of the first lens is a concave surface; the second lens has positive refractive power; the third lens has refractive power, and the image side of the third lens is a convex surface; the fourth lens has refractive power; the fifth lens has refractive power, and the image side of the fifth lens is a convex surface; the sixth lens has refractive power; wherein the distance TTL from the object side 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] The present application provides a six-lens vehicle-mounted optical system. Under the condition that 5.3<TTL / ImgH<6.8 is satisfied, the vehicle-mounted optical system has a small volume, which can better adapt to the miniaturization requirement of vehicle-mounted equipment. However, the reduction of the volume of the vehicle-mounted optical system also leads to larger aberrations. In the present application, by limiting the effective focal lengths and refractive indices of the first lens and the second lens as well as the effective focal length of the vehicle-mounted optical system, the refraction effect of the first lens and the second lens on light rays is controlled. Combined with the matching mode of the negative and positive refractive 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 rays 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 reasonable ranges, the strength of the first lens can be increased to ensure mechanical reliability and stability. Meanwhile, by controlling the distance 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 mitigated, and the imaging stability of the vehicle-mounted optical system is ensured. Preferably, 0.12<CT1 / CT2<0.56, and 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, space can be reserved for the sealing ring of the vehicle-mounted optical system, the air tightness of the vehicle-mounted optical system is ensured, water vapor generation is prevented, and the imaging effect is prevented 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 total sum ΣAT of the air intervals on the optical axis between any two adjacent lenses among the six lenses satisfy: 0<T45 / ΣAT<0.1. By limiting T45 / ΣAT within a reasonable range, it is beneficial to control the spacing 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 / ΣAT<0.08.

[0046] In this embodiment, the radius of curvature R3 of the object side of the second lens and the radius of curvature 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 machinability of the second lens can be effectively ensured, the polishing yield of the second lens is increased, and the cost is reduced. Preferably, -1.45<(R3+R4) / (R3-R4)<2.95.

[0047] In this embodiment, among 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, the following condition is satisfied: 1.7<(SD6+SD10) / SD8<2.1. 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, the following condition is satisfied: 1.1<(CT3+CT5) / CT4<12.5. By restricting (SD6+SD10) / SD8 and (CT3+CT5) / CT4 within reasonable ranges, the radial dimensions of the third, fourth and fifth lenses can be effectively controlled, ensuring the machinability of the spherical lenses. Meanwhile, 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 machinability of the spherical lenses. Preferably, 1.75<(SD6+SD10) / SD8<2.07, and 1.2<(CT3+CT5) / CT4<12.4.

[0048] In this embodiment, among 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, the following condition is satisfied: |(R5+R6) / (R7+R8)|<4.7. Between the effective focal length f3 of the third lens and the effective focal length f4 of the fourth lens, the following condition is satisfied: -2.5<f3 / f4<2.7. By restricting |(R5+R6) / (R7+R8)| and f3 / f4 within reasonable ranges, the sensitivity of the vehicle-mounted optical system can be reduced, while ensuring the machinability of the third lens and the fourth lens. Meanwhile, controlling the effective focal lengths of the third lens and the fourth lens is beneficial to reducing the overall aberration of the vehicle-mounted optical system. Preferably, 0.05<|(R5+R6) / (R7+R8)|<4.65, and -2.4<f3 / f4<2.6.

[0049] In this embodiment, between the central thickness CT6 of the sixth lens and the central thickness CT5 of the fifth lens, the following condition is satisfied: 1.1<CT6 / CT5<6.9. Among 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, the following condition is satisfied: -2.3<(R11+R10) / (R11-R10)<0.3. By restricting 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 machinability of the fifth lens and the sixth lens. Furthermore, by controlling the curvature radii of the sixth lens and the fifth lens, the aberration of the vehicle-mounted optical system can be reduced, and the performance quality can be improved. Preferably, 1.2<CT6 / CT5<6.8, and -2.2<(R11+R10) / (R11-R10)<0.2.

[0050] In this embodiment, 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. By limiting Td / Tr5r10 within a reasonable range, it is beneficial to constrain the thickness of the rear-end lenses, and ensure the processing yield of the lenses while meeting the miniaturization requirement. Preferably, 3.2<Td / Tr5r10<4.3.

[0051] This embodiment further provides an on-vehicle lens module. The on-vehicle lens module includes the above-mentioned on-vehicle optical system and an imaging photosensitive chip, and the photosensitive chip is disposed on the image side of the on-vehicle optical system.

[0052] Second Embodiment

[0053] As shown in Figures 1 to 17 the on-vehicle optical system has only six lenses, all of which are spherical lenses. Along the direction from the object side to the image side of the on-vehicle optical system, the six lenses sequentially include a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. The first lens has negative refractive power, the object side of the first lens is a convex surface, and the image side of the first lens is a concave surface; the second lens has positive refractive power; the third lens has refractive power, and the image side of the third lens is a convex surface; the fourth lens has refractive power; the fifth lens has refractive power, and the image side of the fifth lens is a convex surface; the sixth lens has refractive power. Wherein, the distance TTL in the optical axis direction of the on-vehicle optical system from the object side of the first lens to the imaging plane of the on-vehicle optical system, and the image height ImgH of the on-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 on-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 on-vehicle optical system satisfy: 1.3<f2 / f<4.1; 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.

[0054] The present application provides a six-piece vehicle-mounted optical system. Under the condition of 5.3<TTL / ImgH<6.8, the vehicle-mounted optical system has a small volume, which can better meet the miniaturization requirements of vehicle-mounted equipment. However, the reduction in the volume of the vehicle-mounted optical system also leads to larger aberrations. By limiting the effective focal length, center thickness, on-axis distance of the first lens and the second lens, and the effective focal length of the vehicle-mounted optical system, the present application controls the light deflection effect of the first lens and the second lens. Combined with the matching manner of 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. In addition, the strength of the first lens and the second lens can be increased to ensure the stability of mechanical reliability, effectively weaken the water mist problem, and guarantee 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 the present embodiment may also include other conditional expressions and the vehicle-mounted lens module in the first embodiment, which will not be elaborated one by one here.

[0061] Optionally, the above-mentioned 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] The vehicle-mounted optical system in the present application may adopt a plurality of lenses, for example, the six pieces mentioned above. By reasonably distributing the optical power, surface shape, center thickness of each lens, and on-axis distance 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 machinability of the lens can be improved, so that the vehicle-mounted optical system is more conducive to production and processing and can be applied to portable electronic devices such as smartphones.

[0063] As Figure 1 there is shown a schematic diagram of partial parameters of the vehicle-mounted optical system.

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

[0065] It should be noted that any one of the following examples, from Example 1 to Example 4, is applicable to all implementations of this application.

[0066] Example 1

[0067] like Figures 2 to 5 As shown, an in-vehicle optical system according to Embodiment 1 of this application is described. Figure 2 A schematic diagram of the vehicle-mounted optical system structure of Embodiment 1 is shown.

[0068] like Figure 2 As shown, the vehicle-mounted optical system includes, in order from the object side to the image side: a first lens E1, a second lens E2, an aperture 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 negative optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens E2 has positive optical power, its object-side surface S3 is convex, and its image-side surface S4 is convex. The third lens E3 has positive optical power, its object-side surface S5 is concave, and its image-side surface S6 is convex. The fourth lens E4 has negative optical power, its object-side surface S6 is concave, and its image-side surface S8 is concave. The fifth lens E5 has positive optical power, its object-side surface S9 is concave, and its image-side surface S10 is convex. The sixth lens E6 has positive optical power, its object-side surface S11 is convex, and its image-side surface S12 is convex. The filter has an object-side surface S13 and an image-side surface S14. Light from the object passes through each surface S1 to S14 in sequence and is finally imaged on the imaging surface IMG.

[0070] It should be noted that in this embodiment, the third lens and the fourth lens are cemented together 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 their surface shapes are opposite. However, the image-side surface of the third lens is convex, while the object-side surface of the fourth lens is concave. Cemented lenses can further reduce field curvature, correct off-axis point aberrations of the vehicle optical system, and fully correct various aberrations of the vehicle optical system. Under the premise of compact structure, resolution can be improved, and optical performance such as distortion and CRA (principal angle) can be optimized.

[0071] Table 1 shows the basic structural parameters of the vehicle-mounted optical system in Embodiment 1, where the units for radius of curvature, thickness / distance, and half-aperture are all millimeters (mm).

[0072]

[0073]

[0074] Table 1

[0075] Figure 3 The on-axis chromatic aberration curve of the vehicle-mounted optical system of Embodiment 1 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the vehicle-mounted optical system. Figure 4 The astigmatism curves of the vehicle-mounted optical system of Embodiment 1 are shown, representing the meridional image plane curvature and the sagittal image plane curvature. Figure 5 The distortion curves of the vehicle-mounted optical system in Embodiment 1 are shown, representing the distortion magnitude values ​​corresponding to different field of view angles.

[0076] according to Figures 3 to 5 As can be seen, the vehicle-mounted optical system given in Example 1 can achieve good imaging quality.

[0077] Example 2

[0078] like Figures 6 to 9 As shown, an in-vehicle optical system according to Embodiment 2 of this application is described. Figure 6 A schematic diagram of the vehicle-mounted optical system structure of Embodiment 2 is shown.

[0079] like Figure 6 As shown, the vehicle-mounted optical system includes, in order from the object side to the image side: a first lens E1, a second lens E2, an aperture 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 negative optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens E2 has positive optical power, its object-side surface S3 is concave, and its image-side surface S4 is convex. The third lens E3 has positive optical power, its object-side surface S5 is convex, and its image-side surface S6 is convex. The fourth lens E4 has negative optical power, its object-side surface S7 is convex, and its image-side surface S8 is concave. The fifth lens E5 has positive optical power, its object-side surface S9 is convex, and its image-side surface S10 is convex. The sixth lens E6 has negative optical power, its object-side surface S11 is concave, and its image-side surface S12 is concave. The filter has an object-side surface S13 and an image-side surface S14. Light from the object passes through each surface S1 to S14 in sequence and is finally imaged on the imaging surface IMG.

[0081] Table 2 shows the basic structural parameters of the vehicle-mounted optical system in Embodiment 2, where the units for radius of curvature, thickness / distance, and half-aperture are all millimeters (mm).

[0082]

[0083]

[0084] Table 2

[0085] Figure 7 The on-axis chromatic aberration curve of the vehicle-mounted optical system of Embodiment 2 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the vehicle-mounted optical system. Figure 8 The astigmatism curves of the vehicle-mounted optical system of Embodiment 2 are shown, representing the meridional image plane curvature and the sagittal image plane curvature. Figure 9 The distortion curves of the vehicle-mounted optical system in Embodiment 2 are shown, representing the distortion magnitude values ​​corresponding to different field of view angles.

[0086] according to Figures 7 to 9 It can be seen that the vehicle-mounted optical system given in Example 2 can achieve good imaging quality.

[0087] Example 3

[0088] like Figures 10 to 13 As shown, an in-vehicle optical system according to Embodiment 3 of this application is described. Figure 10 A schematic diagram of the vehicle-mounted optical system structure of Embodiment 3 is shown.

[0089] like Figure 10 As shown, the vehicle-mounted optical system includes, in order from the object side to the image side: a first lens E1, a second lens E2, an aperture 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 negative optical power, its object-side surface S1 is convex, and its image-side surface S2 is concave. The second lens E2 has positive optical power, its object-side surface S3 is convex, and its image-side surface S4 is convex. The third lens E3 has negative optical power, its object-side surface S5 is concave, and its image-side surface S6 is convex. The fourth lens E4 has positive optical power, its object-side surface S7 is convex, and its image-side surface S8 is convex. The fifth lens E5 has positive optical power, its object-side surface S9 is convex, and its image-side surface S10 is convex. The sixth lens E6 has negative optical power, its object-side surface S11 is concave, and its image-side surface S12 is convex. The filter has an object-side surface S13 and an image-side surface S14. Light from the object passes through each surface S1 to S14 in sequence and is finally imaged on the imaging surface IMG.

[0091] Table 3 shows the basic structural parameters of the vehicle-mounted optical system in Embodiment 3, where the units for radius of curvature, thickness / distance, and half-aperture are all millimeters (mm).

[0092]

[0093]

[0094] Table 3

[0095] Figure 11 The on-axis chromatic aberration curve of the vehicle-mounted optical system of Embodiment 3 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the vehicle-mounted optical system. Figure 12 The astigmatism curves of the vehicle-mounted optical system of Embodiment 3 are shown, representing the meridional image plane curvature and the sagittal image plane curvature. Figure 13 The distortion curves of the vehicle-mounted optical system in Embodiment 3 are shown, representing the distortion magnitude values ​​corresponding to different field of view angles.

[0096] according to Figures 11 to 13 As can be seen, the vehicle-mounted optical system given in Example 3 can achieve good imaging quality.

[0097] Example 4

[0098] like Figures 14 to 17 As shown, an in-vehicle optical system according to Embodiment 4 of this application is described. Figure 14 A schematic diagram of the vehicle-mounted optical system structure of Embodiment 4 is shown.

[0099] like Figure 14 As shown, the vehicle-mounted optical system includes, in order from the object side to the image side: a first lens E1, a second lens E2, an aperture 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.

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

[0101] Table 4 shows the basic structural parameters of the vehicle-mounted optical system in Embodiment 4, where the units for radius of curvature, thickness / distance, and half-aperture are all millimeters (mm).

[0102]

[0103]

[0104] Table 4

[0105] Figure 15 The on-axis chromatic aberration curve of the vehicle-mounted optical system of Embodiment 4 is shown, which represents the deflection of the focal point of light of different wavelengths after passing through the vehicle-mounted optical system. Figure 16 The astigmatism curves of the vehicle-mounted optical system of Embodiment 4 are shown, representing the meridional image plane curvature and the sagittal image plane curvature. Figure 17 The distortion curves of the vehicle-mounted optical system in Embodiment 4 are shown, representing the distortion magnitude values ​​corresponding to different field of view angles.

[0106] according to Figures 15 to 17 As can be seen, the vehicle-mounted optical system given in Example 4 can achieve good imaging quality.

[0107] In summary, Examples 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 shows the effective focal length f of the vehicle-mounted optical system in Examples 1 to 4, and the effective focal lengths f1 to f6 of each lens.

[0111]

[0112]

[0113] Table 6

[0114] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0115] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0116] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application 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 where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0117] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A vehicle-mounted optical system, characterized in that, The vehicle-mounted optical system has only six lenses with optical power, all of which are spherical lenses, and sequentially includes from the object side to the image side of the vehicle-mounted optical system: a first lens, which has negative optical power, wherein the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; a second lens, which has positive optical power; a third lens, which has optical power, wherein the image side surface of the third lens is a convex surface; a fourth lens, which has optical power; a fifth lens, which has optical power, wherein the image side surface of the fifth lens is a convex surface; a sixth lens, which has optical power; wherein the positive and negative arrangement of the optical power of the third lens, the fourth lens, the fifth lens and the sixth lens is one of positive-negative-positive-positive, positive-negative-positive-negative, negative-positive-positive-negative, and positive-positive-negative-positive; the distance TTL from the object side surface of the first lens to the imaging plane 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: 5.446≤TTL / ImgH≤6.667; the effective focal length f1 of the first lens and the effective focal length f of the vehicle-mounted optical system satisfy: -2.545≤f1 / f≤-1.188; the effective focal length f2 of the second lens and the effective focal length f of the vehicle-mounted optical system satisfy: 1.478≤f2 / f≤3.965; 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) ≤29.03; the center thickness CT6 of the sixth lens and the center thickness CT5 of the fifth lens satisfy: 1.213≤CT6 / CT5≤6.75; 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: 3.291≤Td / Tr5r10≤4.

210.

2. The vehicle-mounted optical system according to claim 1, characterized in that, the center thickness CT1 of the first lens and the center thickness CT2 of the second lens satisfy: 0.1<CT1 / CT2≤0.496, 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 surface of the first lens to the object side surface of the second lens satisfy: 0.593≤(CT1+CT2) / T12≤1.

928.

3. The vehicle-mounted 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 vehicle-mounted 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 intervals on the optical axis between any two adjacent lenses among the six lenses satisfy: 0<T45 / ∑AT<0.

1.

5. The vehicle-mounted optical system according to claim 1, characterized in that, The radius of curvature R3 of the object side of the second lens and the radius of curvature R4 of the image side of the second lens satisfy the following condition: -1.35≤(R3+R4) / (R3-R4)<3.

0.

6. The vehicle-mounted 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 the following condition: 1.848≤(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 the following condition: 1.329≤(CT3+CT5) / CT4≤12.

316.

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 the following: |(R5+R6) / (R7+R8)|≤4.597, and the effective focal length f3 of the third lens and the effective focal length f4 of the fourth lens satisfy the following: -2.37≤f3 / f4≤2.

534.

8. The vehicle-mounted optical system according to claim 1, characterized in that, The radius of curvature R11 of the object side of the sixth lens and the radius of curvature R10 of the image side of the fifth lens satisfy the following condition: -2.187≤(R11+R10) / (R11-R10)≤0.

173.

9. A vehicle-mounted camera module, characterized in that, The vehicle-mounted lens module includes a vehicle-mounted optical system and a photosensitive chip as described in any one of claims 1 to 8, wherein the photosensitive chip is disposed on the image side of the vehicle-mounted optical system.

Images