Vehicle-mounted optical imaging system and camera module applied by same

Abstract

The invention provides a vehicle-mounted optical imaging system and a camera module thereof, the vehicle-mounted optical imaging system is composed of seven lenses, the first lens has negative focal power, the object side surface of the first lens is a convex surface, the image side surface of the first lens is a concave surface, the second lens has focal power, the third lens has focal power, the fourth lens has positive focal power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; the fifth lens has focal power, the object side surface of the fifth lens is a convex surface, the image side surface of the fifth lens is a convex surface, the sixth lens has negative focal power, the object side surface of the sixth lens is a concave surface, the seventh lens has positive focal power, the object side surface of the seventh lens is a convex surface, and the refractive power and the surface types of all the lenses are reasonably configured, so that the optical lens has the advantages of large aperture, low cost, miniaturization, good imaging quality and the like; meanwhile, detail information of an object can be well captured, the detail capacity of the optical lens for capturing and shooting the object is improved, the picture texture of the optical lens is improved, and the resolution ratio and the imaging definition of the optical lens are improved, so that the requirement of automatic driving application is met.

Description

Technical Field

[0001] The present application relates to the field of optical imaging, and in particular to a vehicle-mounted optical imaging system and a camera module used therein. Background Art

[0002] With the rapid development of automobile assisted driving systems, optical lenses are being used more and more widely in automobiles. At the same time, users are increasingly demanding the imaging quality of vehicle-mounted lenses. In order to obtain information more accurately, the system needs to be equipped with a larger chip with higher resolution, so the resolution requirements for the vehicle-mounted optical lenses themselves are also getting higher and higher. In addition, for safety reasons, vehicle-mounted optical lenses used in the field of autonomous driving have higher requirements for stability and need to be able to cope with various harsh environments to avoid a significant decrease in lens performance under different environments.

[0003] The optical lens in the prior art can achieve a resolution of one million pixels, but the aberration problems of the optical lens, such as chromatic aberration, astigmatism, and distortion, are relatively serious. Moreover, the light transmission capacity is not strong, and the amount of light entering is small in low-light environments such as night or rainy days. At the same time, it will also produce adverse effects such as unclear images in high and low temperature environments. The thermal stability of the optical lens is poor. After returning from high temperature to normal temperature, the resolution ability is difficult to meet the requirements, and the cost is high and the quality is heavy. Summary of the invention

[0004] The present application aims to solve the aberration problems of existing optical lenses such as chromatic aberration, astigmatism, distortion, etc., and to provide a vehicle-mounted optical imaging system. By selecting an appropriate number of lenses and reasonably configuring the refractive power and surface shape of each lens, the optical lens has the characteristics of large light throughput, low cost, miniaturization, and good imaging quality. At the same time, it can also better capture the detailed information of the object, improve the ability of the optical lens to capture the details of the photographed object, improve the image quality of the optical lens, and improve the resolution and imaging clarity of the optical lens to meet the requirements of autonomous driving applications.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: A vehicle-mounted optical imaging system, which is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens in sequence from an object plane to an image plane along an optical axis; The first lens has negative optical power, its object side surface is convex, and its image side surface is concave; The second lens has an optical power; The third lens has optical power; The fourth lens has positive refractive power, its object side surface is convex, and its image side surface is convex; The fifth lens has optical power, its object side surface is convex, and its image side surface is convex; The sixth lens has negative optical power, and its object side surface is concave; The seventh lens element has positive refractive power, and its object side surface is convex.

[0006] Furthermore, the vehicle-mounted optical imaging system satisfies the following relationship: -3.0 <f123 / f<-0.7; 1.8<(f-f12) / f<4.0; Wherein, f is the effective focal length of the optical imaging system, f12 is the effective combined focal length of the first lens and the second lens, and f123 is the effective combined focal length of the first lens, the second lens, and the third lens.

[0007] Furthermore, the vehicle-mounted optical imaging system satisfies the following relationship: 1.4 <f / EPD ≤ 1.7; 27 <TTL / ImgH*DT11<37; Wherein, f is the effective focal length of the optical imaging system, EPD is the entrance pupil diameter of the optical imaging lens, TTL is the axial distance from the object side of the first lens to the imaging surface, ImgH is half of the diagonal length of the effective pixel area on the imaging surface, and DT11 is the maximum effective radius of the object side of the first lens.

[0008] Furthermore, the vehicle-mounted optical imaging system satisfies the following relationship: 1.5 <DT11 / DT72<2.2; 3.1 <DT11 / SAG1<4.7; Among them, DT11 is the maximum effective radius of the object side of the first lens, DT72 is the maximum effective radius of the image side of the seventh lens, and SAG1 is the distance from the maximum effective aperture of the object side of the first lens to the intersection of the object side of the first lens and the optical axis in the direction parallel to the optical axis.

[0009] Furthermore, the vehicle-mounted optical imaging system satisfies the following relationship: 2.0 <f45 / f<5.0; Wherein, f is the effective focal length of the optical imaging system, and f45 is the combined focal length of the fourth lens and the fifth lens.

[0010] Furthermore, the vehicle-mounted optical imaging system satisfies the following relationship: -2.7<(SAG11-SAG12) / CT6<-1.3; 3.6 <CT3 / |SAG6|<7.5; Among them, CT6 is the thickness of the sixth lens on the optical axis, SAG6 is the distance from the maximum effective aperture of the image side of the third lens to the intersection of the image side of the third lens and the optical axis in the direction parallel to the optical axis, SAG11 is the distance from the maximum effective aperture of the object side of the sixth lens to the intersection of the object side of the sixth lens and the optical axis in the direction parallel to the optical axis, and SAG12 is the distance from the maximum effective aperture of the image side of the sixth lens to the intersection of the image side of the sixth lens and the optical axis in the direction parallel to the optical axis.

[0011] Furthermore, the vehicle-mounted optical imaging system satisfies the following relationship: -1.7 <R10 / CT5<-0.9; -2.0 <R4 / f ≤ 0.9; Wherein, R4 is the curvature radius of the image side surface of the second lens, R10 is the curvature radius of the image side surface of the fifth lens, f is the effective focal length of the optical imaging system, and CT5 is the thickness of the fifth lens on the optical axis.

[0012] Furthermore, the vehicle-mounted optical imaging system satisfies the following relationship: 0.4<(T12+CT2) / (T23+CT3)<3.7; Wherein, T12 is the distance from the image side surface of the first lens to the object side surface of the second lens on the optical axis, T23 is the distance from the image side surface of the second lens to the object side surface of the third lens on the optical axis, CT2 is the thickness of the second lens on the optical axis, and CT3 is the thickness of the third lens on the optical axis.

[0013] Furthermore, the F number of the vehicle-mounted optical imaging system is 1.4-1.7; and the total optical length of the vehicle-mounted optical imaging system is ≤22 mm.

[0014] Further, the fourth lens and the seventh lens are aspherical lenses, any one of the second lens and the third lens is an aspherical lens, and the rest are spherical lenses.

[0015] On the other hand, an embodiment of the present application further provides a camera module, which includes at least an optical lens, in which the above-mentioned vehicle-mounted optical imaging system is installed.

[0016] Compared with the prior art, the beneficial effects of this application are as follows: The present invention provides a vehicle-mounted optical imaging system and a camera module used therein, which are composed of seven lenses, wherein a first lens has negative optical power, an object side surface thereof is a convex surface, and an image side surface thereof is a concave surface, a second lens has optical power, a third lens has optical power, a fourth lens has positive optical power, an object side surface thereof is a convex surface, and an image side surface thereof is a convex surface, a fifth lens has optical power, an object side surface thereof is a convex surface, and an image side surface thereof is a convex surface, a sixth lens has negative optical power, and an object side surface thereof is a concave surface, and a seventh lens has positive optical power, and an object side surface thereof is a convex surface. By reasonably configuring the refractive power and surface shape of each lens, the optical lens has the advantages of large aperture, low cost, miniaturization, good imaging quality, and the like, and can also better capture object detail information, improve the optical lens's ability to capture details of the photographed object, improve the image quality of the optical lens, and improve the resolution and imaging clarity of the optical lens, so as to meet the requirements of autonomous driving applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for describing the embodiments are briefly introduced below.

[0018] Figure 1 It is a structural schematic diagram of an optical imaging system or camera module according to Embodiment 1 of the present application; Figure 2 is the axial chromatic aberration, astigmatism and distortion curve of the optical imaging system or camera module in Example 1 of the present application; Figure 3 It is a structural schematic diagram of an optical imaging system or camera module according to Embodiment 2 of the present application; Figure 4 is the axial chromatic aberration, astigmatism and distortion curve of the optical imaging system or camera module in Example 2 of the present application; Figure 5 It is a structural schematic diagram of an optical imaging system or camera module according to Embodiment 3 of the present application; Figure 6 The axial chromatic aberration, astigmatism and distortion curves of the optical imaging system or camera module of Example 3 of the present application; Figure 7 It is a structural schematic diagram of an optical imaging system or camera module according to Embodiment 4 of the present application; Figure 8 These are the axial chromatic aberration, astigmatism and distortion curves of the optical imaging system or camera module of Example 4 of the present application. DETAILED DESCRIPTION

[0019] like Figure 1-8 As shown, the present application provides a vehicle-mounted optical imaging system, which is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens in sequence from the object plane to the image plane along the optical axis; The first lens has a negative optical power, its object side is convex, and its image side is concave; The second lens has an optical power; The third lens has an optical power; The fourth lens has a positive optical power, its object side is convex, and its image side is convex; The fifth lens has an optical power, its object side is convex, and its image side is convex; The sixth lens has a negative optical power, and its object side is concave; The seventh lens has a positive optical power, and its object side is convex.

[0020] An embodiment of the present invention discloses a vehicle-mounted optical imaging system, which is composed of 7 lenses. By reasonably configuring the refractive power and surface type of each lens, the optical lens has the advantages of large aperture, low cost, miniaturization, good imaging quality, etc. At the same time, it can also capture object detail information better, improve the ability of the optical lens to capture details of the photographed object, improve the picture quality of the optical lens, and improve the resolution and imaging clarity of the optical lens to meet the requirements of autonomous driving applications.

[0021] Further, the vehicle-mounted optical imaging system satisfies the following relationships: 1.4 < f / EPD ≤ 1.7, 27 < TTL / ImgH*DT11 < 37, where f is the effective focal length of the optical imaging system, EPD is the entrance pupil diameter of the optical imaging lens, TTL is the axial distance from the object side of the first lens to the imaging surface, ImgH is half of the diagonal length of the effective pixel area on the imaging surface, and DT11 is the maximum effective radius of the object side of the first lens. By controlling the ratio of TTL / Imgh, the optical system has good thin and light characteristics, and by adding the limitation of the maximum effective radius of the first lens of the optical system, the front end of the optical system can have the characteristic of a small aperture, ensuring that the optical system has the characteristics of a large aperture, miniaturization, and thin and light. When it is lower than the lower limit of the relational expression, while ensuring that the optical lens has a small aperture, the TTL of the optical lens increases, which is not conducive to the miniaturization of the lens; when it exceeds the upper limit of the relational expression, it is not conducive to the expansion of the imaging surface of the optical imaging system, reducing the resolution and imaging resolution of the optical system.

[0022] Furthermore, the vehicle-mounted optical imaging system satisfies the following relationship: 1.5 < DT11 / DT72 < 2.2, where DT11 is the maximum effective radius of the object side of the first lens, and DT72 is the maximum effective radius of the image side of the seventh lens. By restricting the ratio of the maximum effective radius of the object side of the first lens to the maximum effective radius of the image side of the seventh lens, the aperture relationship between the first lens and the eighth lens at a large field of view can be reasonably controlled, keeping the maximum effective radius of the first lens within a reasonable range, so that the optical lens features a small aperture. When below the lower limit of the relational expression, the difference in the aperture between the first lens and the seventh lens is reduced, which is not conducive to reducing the size of the optical system head and improving its compactness. When exceeding the upper limit of the relational expression, the aperture of the seventh lens is excessively compressed, which is not conducive to improving the image quality of the optical system and correcting distortion.

[0023] Furthermore, the vehicle-mounted optical imaging system satisfies the following relationship: -3.0 < f123 / f < -0.7, where f123 is the effective combined focal length of the first, second, and third lenses, and f is the effective focal length of the optical imaging system. By restricting the ratio of the combined focal length of the first, second, and third lenses to the effective focal length of the optical lens, the optical power of the optical system can be more reasonably distributed among the first, second, and third lenses, reducing the optical power pressure on the first lens, which helps to reduce the aperture of the first lens and meet the requirement of a small aperture. At the same time, it can quickly converge light, thus refracting paraxial light at a low deflection angle and reducing spherical aberration.

[0024] Furthermore, the vehicle-mounted optical imaging system satisfies the following relationship: -2.7 < (SAG11 - SAG12) / CT6 < -1.3; where CT6 is the thickness of the sixth lens on the optical axis, SAG11 is the distance parallel to the optical axis from the maximum effective clear aperture of the object side of the sixth lens to the intersection of the object side of the sixth lens and the optical axis, and SAG12 is the distance parallel to the optical axis from the maximum effective clear aperture of the image side of the sixth lens to the intersection of the image side of the sixth lens and the optical axis. By defining the range of the above conditional expression, the ratio of the sag heights of the object side and the image side of the sixth lens to the central thickness can be reasonably configured, thus reasonably controlling the shape of the sixth lens, preventing the surface shape of the sixth lens from being too curved, which is beneficial to reducing the tolerance sensitivity of the sixth lens, and further beneficial to the processing and forming of the sixth lens, and better realizing engineering manufacturing.

[0025] Furthermore, the vehicle-mounted optical imaging system satisfies the following relationship: -1.7 < R10 / CT5 < -0.9, where R10 is the radius of curvature of the image side of the fifth lens, and CT5 is the thickness of the fifth lens on the optical axis. By defining the range of the ratio of the radius of curvature of the image side of the fifth lens to the thickness of the fifth lens on the optical axis, it is beneficial for the light to be deflected reasonably in the fifth lens, which in turn is beneficial for the improvement of the system MTF, thereby improving the resolution of the system imaging. Below the lower limit of the above conditional formula, the radius of curvature of the image side of the fifth lens is too large, resulting in an increased risk of ghost images due to the easy reflection of light on the image side of the fifth lens. Exceeding the upper limit of the above conditional formula, the central thickness of the fifth lens is too large, resulting in unreasonable deflection of light in the fifth lens, which is not conducive to the improvement of the system MTF.

[0026] Furthermore, the vehicle-mounted optical imaging system satisfies the following relationship: -2.0 < R4 / f ≤ 0.9, where R4 is the radius of curvature of the image side of the second lens, and f is the effective focal length of the optical imaging system. By defining the range of the above relational formula, it is beneficial to restrict the curvature of the image side of the second lens, allowing more light to enter the optical system. At the same time, it is also beneficial to reasonably distribute the refractive power of the optical system and correct the off-axis aberration of the optical system. Below the lower limit of the relational formula, the focal length of the optical system is too large, which is not conducive to achieving the miniaturization characteristics and further affects the thinness and lightness of the entire optical system; exceeding the upper limit of the relational formula, the radius of curvature of the image side of the second lens is too small, and the image side of the second lens is too curved, which further increases the risk of ghost images.

[0027] Furthermore, the vehicle-mounted optical imaging system satisfies the following relationship: 3.6 < CT3 / |SAG6| < 7.5, where CT3 is the thickness of the third lens on the optical axis, and SAG6 is the distance parallel to the optical axis from the maximum effective aperture of the image side of the third lens to the intersection of the image side of the third lens and the optical axis. By controlling the range of the ratio of the central thickness of the third lens to the sagittal height of the image side of the third lens, it is possible to enable the third lens to have a high refractive power while avoiding an excessive central thickness or an overly curved image side of the third lens, which increases the manufacturing difficulty of the third lens, thereby reducing the production cost of the third lens. When below the lower limit of the above relational formula, the image side of the third lens is too curved, resulting in an increased processing difficulty of the third lens and thus an increased production cost; when exceeding the upper limit of the above relational formula, the thickness value of the third lens is too large, which is not conducive to the lightness and miniaturization of the optical lens.

[0028] Further, the in-vehicle optical imaging system satisfies the following relationship: 0.4 < (T12 + CT2) / (T23 + CT3) < 3.7, where T12 is the distance on the optical axis from the image side of the first lens to the object side of the second lens, T23 is the distance on the optical axis from the image side of the second lens to the object side of the third lens, CT2 is the thickness of the second lens on the optical axis, and CT3 is the thickness of the third lens on the optical axis. When the optical system satisfies the above conditional formula, it is beneficial to correct the high-order aberrations of the system, improve the imaging resolution, and at the same time ensure the compact structure of the system and meet the requirements of miniaturization. When (T12 + CT2) / (T23 + CT3) ≤ 0.4, or (T12 + CT2) / (T23 + CT3) ≥ 3.7, it is not conducive to the correction of the high-order aberrations of the optical system, thereby reducing the imaging quality. At the same time, the setting of too large an air gap and lens thickness will increase the total length of the optical system, which is not conducive to the miniaturization of the optical system.

[0029] Further, the in-vehicle optical imaging system satisfies the following relationship: 3.1 < DT11 / SAG1 < 4.7, where DT11 is the maximum effective radius of the object side of the first lens, and SAG1 is the distance parallel to the optical axis from the maximum effective clear aperture of the object side of the first lens to the intersection of the object side of the first lens and the optical axis. By controlling the ratio range of the above sub-formula, it is beneficial to reduce the aberration risk generated at the edge of the first lens and avoid the excessive curvature of the object side of the first lens, which increases the manufacturing difficulty of the first lens. Below the lower limit of the relational formula, the sagitta of the object side of the first lens is too large, resulting in the excessive curvature of the object side of the first lens. While increasing the manufacturing difficulty, it is easy to cause serious deflection of the marginal rays, which is not conducive to correcting the aberrations of the optical system, thereby reducing the imaging quality of the optical system; exceeding the upper limit of the relational formula, the maximum effective radius of the object side of the third lens increases, making the aperture of the first lens increase, which is not conducive to the miniaturization of the optical system.

[0030] Further, the in-vehicle optical imaging system satisfies the following relationship: 1.8 < (f - f12) / f < 4.0, where f is the effective focal length of the optical imaging system, and f12 is the effective combined focal length of the first lens and the second lens. By reasonably controlling the ratio range of the combined focal length of the first lens and the second lens to the effective focal length of the optical imaging system, the optical system can satisfy a large field of view angle and at the same time obtain a high imaging resolution. Exceeding the upper limit of the relational formula, the refractive power of the second lens is insufficient, and it is difficult for large-angle light rays to enter the optical system, which is not conducive to expanding the field of view angle range of the optical system; below the lower limit of the relational formula, the refractive power of the second lens is too strong, and strong astigmatism and chromatic aberration are easily generated, which is not conducive to the high-resolution imaging characteristics.

[0031] Furthermore, the on-vehicle optical imaging system satisfies the following relationship: 2.0 < f45 / f < 5.0, where f45 is the combined focal length of the fourth lens and the fifth lens, and f is the effective focal length of the optical imaging system. By constraining the ratio of the combined focal length of the fourth lens and the fifth lens to the effective focal length of the optical imaging system, the optical power and surface shape of the fourth lens and the fifth lens can be reasonably allocated, thereby controlling off-axis aberrations and improving imaging quality; at the same time, it is possible to avoid the surface shape of the fourth lens and the fifth lens from being too curved, thereby increasing the manufacturing difficulty.

[0032] In specific embodiments of the present application, in Embodiment 1, Embodiment 2, and Embodiment 3, the second lens, the fourth lens, and the seventh lens are aspherical lenses, and the rest are spherical lenses, and all are separated by air gaps. In Embodiment 4, the third lens, the fourth lens, and the seventh lens are aspherical lenses, and the rest are spherical lenses, and all are separated by air gaps; the F number of the optical imaging system is 1.4 to 1.7; the overall optical length of the optical imaging system ≤ 22 mm. The embodiments of the present invention disclose an on-vehicle optical imaging system. By selecting 3 aspherical lenses and 4 spherical lenses and reasonably configuring the refractive power and surface shape of each lens, the optical lens has the advantages of a large aperture, low cost, miniaturization, good imaging quality, etc. At the same time, it can also better capture the detailed information of the object, improve the ability of the optical lens to capture the details of the photographed object, improve the texture of the optical lens, improve the resolution and imaging clarity of the optical lens, so as to meet the requirements of autonomous driving applications.

[0033] Embodiment 1 The following refers to Figure 1 to Figure 2 Describe the optical imaging lens according to Embodiment 1 of the present application. Figure 1 The structural schematic diagram of the optical imaging lens according to Embodiment 1 of the present application is shown.

[0034] As Figure 1 shown, the optical imaging lens according to an exemplary embodiment of the present application sequentially includes, along the optical axis from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an infrared filter E8, and an imaging surface S16.

[0035] The first lens E1 has negative power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative power, and its object side surface S3 is concave, and its image side surface S4 is convex. The third lens E3 has positive power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has positive power, and its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has negative power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has negative power, and its object side surface S10 is concave, and its image side surface S11 is convex. The seventh lens E7 has positive power, and its object side surface S12 is convex, and its image side surface S13 is concave. The filter E8 has an object side surface S14 and an image side surface S15. The light from the object passes through each surface S1 to S15 in sequence and is finally imaged on the imaging surface S16.

[0036] Table 1 shows the surface type, curvature radius, thickness and material of each lens of the optical imaging lens of Example 1, wherein the units of the curvature radius and thickness are both millimeters (mm).

[0037] Table 1

[0038] In Table 1, the object side surface and the image side surface of any one of the second lens E2, the fourth lens E4 and the seventh lens E7 are all Q-type aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical formula:

[0039] Where Z is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, r is the radial coordinate of the aspherical surface, c is the curvature of the vertex of the aspherical surface, K is the cone coefficient, Am is the aspherical coefficient, and r is the curvature of the vertex of the aspherical surface. max is the maximum radial radius coordinate, u=r / r max Table 2 shows the conic coefficients and high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28 and A30 of various aspheric surfaces that can be used in the first embodiment.

[0040] Table 2

[0041] Figure 2 The axial chromatic aberration, astigmatism and distortion curves of the optical imaging lens of Example 1 are shown. Axial chromatic aberration indicates that light of different wavelengths deviates from the focal point after passing through the lens; astigmatism indicates the meridional image curvature and sagittal image curvature; distortion indicates the distortion magnitude value corresponding to different image heights. The optical imaging lens given in Example 1 can achieve good imaging quality.

[0042] Embodiment 2 Reference Figure 3 to Figure 4 An optical imaging lens according to Embodiment 2 of the present application is described. Figure 3 A schematic structural diagram of an optical imaging lens according to Embodiment 2 of the present application is shown.

[0043] like Figure 3 As shown, the optical imaging lens according to an exemplary embodiment of the present application includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an infrared filter E8 and an imaging surface S16.

[0044] The first lens E1 has negative power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative power, and its object side surface S3 is concave, and its image side surface S4 is convex. The third lens E3 has positive power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has positive power, and its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has positive power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has negative power, and its object side surface S10 is concave, and its image side surface S11 is concave. The seventh lens E7 has positive power, and its object side surface S12 is convex, and its image side surface S13 is convex. The filter E8 has an object side surface S14 and an image side surface S15. The light from the object passes through each surface S1 to S15 in sequence and is finally imaged on the imaging surface S16.

[0045] 3 shows the surface type, curvature radius, thickness and material of each lens of the optical imaging lens of Example 2, wherein the units of the curvature radius and thickness are both millimeters (mm).

[0046] Table 3

[0047] In Table 3, the object side surface and the image side surface of any one of the second lens E2, the fourth lens E4 and the seventh lens E7 are all Q-type aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0048] Where Z is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, r is the radial coordinate of the aspherical surface, c is the curvature of the vertex of the aspherical surface, K is the cone coefficient, Am is the aspherical coefficient, and r is the curvature of the vertex of the aspherical surface. max is the maximum radial radius coordinate, u=r / r maxTable 4 shows the conic coefficients and high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28 and A30 of the aspheric surfaces that can be used in the second embodiment.

[0049] Table 4

[0050] Figure 4 The axial chromatic aberration, astigmatism and distortion curves of the optical imaging lens of Example 2 are shown. Axial chromatic aberration indicates that light of different wavelengths deviates from the focal point after passing through the lens; astigmatism indicates the meridional image curvature and sagittal image curvature; distortion indicates the distortion magnitude value corresponding to different image heights. The optical imaging lens given in Example 2 can achieve good imaging quality.

[0051] Embodiment 3 The following reference Figures 5 and 6 An optical imaging lens according to Embodiment 3 of the present application is described. Figure 5 A schematic structural diagram of an optical imaging lens according to Embodiment 3 of the present application is shown.

[0052] like Figure 5 As shown, the optical imaging lens according to an exemplary embodiment of the present application includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an infrared filter E8 and an imaging surface S16.

[0053] The first lens E1 has negative power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has positive power, and its object side surface S3 is concave, and its image side surface S4 is convex. The third lens E3 has negative power, and its object side surface S5 is concave, and its image side surface S6 is convex. The fourth lens E4 has positive power, and its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has positive power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has negative power, and its object side surface S10 is concave, and its image side surface S11 is convex. The seventh lens E7 has positive power, and its object side surface S12 is convex, and its image side surface S13 is concave. The filter E8 has an object side surface S14 and an image side surface S15. The light from the object passes through each surface S1 to S15 in sequence and is finally imaged on the imaging surface S16.

[0054] Table 5 shows the surface type, curvature radius, thickness and material of each lens of the optical imaging lens of Example 3, wherein the units of the curvature radius and thickness are both millimeters (mm).

[0055] Table 5

[0056] In Table 5, the object side surface and the image side surface of any one of the second lens E2, the fourth lens E4 and the seventh lens E7 are all Q-type aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0057] Where Z is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, r is the radial coordinate of the aspherical surface, c is the curvature of the vertex of the aspherical surface, K is the cone coefficient, Am is the aspherical coefficient, and r is the curvature of the vertex of the aspherical surface. max is the maximum radial radius coordinate, u=r / r max Table 6 shows the conic coefficients and high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28 and A30 of each aspheric surface that can be used in the third embodiment.

[0058] Table 6

[0059] Figure 6 The axial chromatic aberration, astigmatism and distortion curves of the optical imaging lens of Example 3 are shown. Axial chromatic aberration indicates that light of different wavelengths deviates from the focal point after passing through the lens; astigmatism indicates the meridional image curvature and sagittal image curvature; distortion indicates the distortion magnitude value corresponding to different image heights. The optical imaging lens given in Example 3 can achieve good imaging quality.

[0060] Embodiment 4: The following reference Figures 7 and 8 An optical imaging lens according to Embodiment 4 of the present application is described. Figure 7 A schematic structural diagram of an optical imaging lens according to Embodiment 4 of the present application is shown.

[0061] like Figure 7 As shown, the optical imaging lens according to an exemplary embodiment of the present application includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, STO, a fifth lens E5, a sixth lens E6, a seventh lens E7, an infrared filter E8 and an imaging surface S16.

[0062] The first lens E1 has negative power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has negative power, and its object side surface S5 is concave, and its image side surface S6 is convex. The fourth lens E4 has positive power, and its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has positive power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has negative power, and its object side surface S10 is concave, and its image side surface S11 is concave. The seventh lens E7 has positive power, and its object side surface S12 is convex, and its image side surface S13 is convex. The filter E8 has an object side surface S14 and an image side surface S15. The light from the object passes through each surface S1 to S15 in sequence and is finally imaged on the imaging surface S16.

[0063] Table 7 shows the surface type, curvature radius, thickness and material of each lens of the optical imaging lens of Example 4, wherein the units of the curvature radius and thickness are both millimeters (mm).

[0064] Table 7

[0065] In Table 7, the object side surface and the image side surface of any one of the third lens E3, the fourth lens E4 and the seventh lens E7 are all Q-type aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical formula:

[0066] Where Z is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, r is the radial coordinate of the aspherical surface, c is the curvature of the vertex of the aspherical surface, K is the cone coefficient, Am is the aspherical coefficient, and r is the curvature of the vertex of the aspherical surface. max is the maximum radial radius coordinate, u=r / r max Table 8 shows the conic coefficients and high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28 and A30 of each aspheric surface that can be used in the fourth embodiment.

[0067] Table 8

[0068] Figure 8 The axial chromatic aberration, astigmatism and distortion curves of the optical imaging lens of Example 4 are shown. Axial chromatic aberration indicates the deviation of light of different wavelengths from the focal point after passing through the lens; astigmatism indicates the meridional image curvature and sagittal image curvature; distortion indicates the distortion magnitude value corresponding to different image heights. The optical imaging lens given in Example 4 can achieve good imaging quality.

[0069] In Examples 1-4, the basic data are as follows: Table 9

[0070] In Examples 1-4, each conditional expression satisfies the conditions in the following table: Table 10

[0071] A camera module comprises at least an optical lens, in which the above-mentioned vehicle-mounted optical imaging system is installed. By selecting a suitable number of lenses and reasonably configuring the refractive power and surface shape of each lens, the optical lens has the characteristics of large light throughput, low cost, miniaturization, good imaging quality, etc. At the same time, it can also better capture the detailed information of the object, improve the ability of the optical lens to capture the details of the photographed object, improve the image quality of the optical lens, and improve the resolution and imaging clarity of the optical lens to meet the requirements of autonomous driving applications.

[0072] As described above, one or more implementation methods are provided in combination with specific contents, and the specific implementation of the present invention is not limited to these descriptions. Any similarity or similarity with the method, structure, etc. of the present invention, or any technical deduction or replacement based on the concept of the present invention, shall be regarded as the protection scope of the present invention.

Claims

1. A vehicle-mounted optical imaging system, characterized in that: Along the optical axis, from the object plane to the image plane, it is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens in sequence; The first lens has negative optical power, its object side surface is convex, and its image side surface is concave; The second lens has an optical power; The third lens has an optical power; The fourth lens has positive refractive power, its object side surface is convex, and its image side surface is convex; The fifth lens has optical power, its object side surface is convex, and its image side surface is convex; The sixth lens has negative optical power, and its object side surface is concave; The seventh lens has positive refractive power, and its object side surface is convex; The vehicle-mounted optical imaging system satisfies the following relationship: -3.0 < f123 / f < -0.7; 1.8 < (f-f12) / f < 4.0; Wherein, f is the effective focal length of the optical imaging system, f12 is the effective combined focal length of the first lens and the second lens, and f123 is the effective combined focal length of the first lens, the second lens, and the third lens.

2. The vehicle-mounted optical imaging system according to claim 1, characterized in that: The vehicle-mounted optical imaging system satisfies the following relationship: 1.4 < f / EPD ≤ 1.7; 27 < TTL / ImgH*DT11 < 37; Wherein, f is the effective focal length of the optical imaging system, EPD is the entrance pupil diameter of the optical imaging lens, TTL is the axial distance from the object side of the first lens to the imaging surface, ImgH is half of the diagonal length of the effective pixel area on the imaging surface, and DT11 is the maximum effective radius of the object side of the first lens.

3. The vehicle-mounted optical imaging system according to claim 1, characterized in that: The vehicle-mounted optical imaging system satisfies the following relationship: 1.5 < DT11 / DT72 < 2.2; 3.1 < DT11 / SAG1 < 4.7; Among them, DT11 is the maximum effective radius of the object side of the first lens, DT72 is the maximum effective radius of the image side of the seventh lens, and SAG1 is the distance from the maximum effective aperture of the object side of the first lens to the intersection of the object side of the first lens and the optical axis in the direction parallel to the optical axis.

4. The vehicle-mounted optical imaging system according to claim 1, characterized in that: The vehicle-mounted optical imaging system satisfies the following relationship: 2.0 < f45 / f < 5.0; Wherein, f is the effective focal length of the optical imaging system, and f45 is the combined focal length of the fourth lens and the fifth lens.

5. The vehicle-mounted optical imaging system according to claim 1, characterized in that: The vehicle-mounted optical imaging system satisfies the following relationship: -2.7 < (SAG11-SAG12) / CT6 < -1.3; 3.6 < CT3 / |SAG6| < 7.5; Among them, CT6 is the thickness of the sixth lens on the optical axis, SAG6 is the distance from the maximum effective aperture of the image side of the third lens to the intersection of the image side of the third lens and the optical axis in the direction parallel to the optical axis, SAG11 is the distance from the maximum effective aperture of the object side of the sixth lens to the intersection of the object side of the sixth lens and the optical axis in the direction parallel to the optical axis, and SAG12 is the distance from the maximum effective aperture of the image side of the sixth lens to the intersection of the image side of the sixth lens and the optical axis in the direction parallel to the optical axis.

6. The vehicle-mounted optical imaging system according to claim 1, characterized in that: The vehicle-mounted optical imaging system satisfies the following relationship: -1.7 < R10 / CT5 < -0.9; -2.0 < R4 / f ≤ 0.9; Wherein, R4 is the curvature radius of the image side surface of the second lens, R10 is the curvature radius of the image side surface of the fifth lens, f is the effective focal length of the optical imaging system, and CT5 is the thickness of the fifth lens on the optical axis.

7. The vehicle-mounted optical imaging system according to claim 1, characterized in that: The vehicle-mounted optical imaging system satisfies the following relationship: 0.4 < (T12+CT2) / (T23+CT3) < 3.7; Wherein, T12 is the distance from the image side surface of the first lens to the object side surface of the second lens on the optical axis, T23 is the distance from the image side surface of the second lens to the object side surface of the third lens on the optical axis, CT2 is the thickness of the second lens on the optical axis, and CT3 is the thickness of the third lens on the optical axis.

8. The vehicle-mounted optical imaging system according to claim 1, characterized in that: The F number of the vehicle-mounted optical imaging system is 1.4-1.7; the total optical length of the vehicle-mounted optical imaging system is ≤22 mm.

9. The vehicle-mounted optical imaging system according to claim 1, characterized in that: The fourth lens and the seventh lens are aspherical lenses, any one of the second lens and the third lens is an aspherical lens, and the rest are spherical lenses.

10. A camera module, comprising at least an optical lens, characterized in that: The optical lens is equipped with the vehicle-mounted optical imaging system according to any one of claims 1 to 9.

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