Vehicle-mounted optical imaging system and camera module applied thereto

Abstract

The application provides a vehicle-mounted optical imaging system and an applied camera module, which are composed of seven lenses, the first lens has negative optical power, the object side is a convex surface, and the image side is a concave surface, the second lens has optical power, the third lens has optical power, the fourth lens has positive optical power, the object side is a convex surface, and the image side is a convex surface, the fifth lens has optical power, the object side is a convex surface, and the image side is a convex surface, the sixth lens has negative optical power, the object side is a concave surface, and the seventh lens has positive optical power, the object side is a convex surface, 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 and the like, meanwhile, the object detail information can be better captured, the detail capturing ability of the optical lens for the object is improved, the picture quality of the optical lens is improved, the resolution and imaging clarity of the optical lens are improved, and the requirements of automatic driving application are met.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical imaging, in particular to a vehicle-mounted optical imaging system and an application thereof. BACKGROUND

[0002] With the rapid development of the automobile auxiliary driving system, optical lenses are more and more widely used in automobiles. At the same time, users have higher and higher requirements for the imaging quality of vehicle-mounted lenses. In order to obtain information more accurately, the system needs to be matched with a large chip with higher resolution, so the requirement for the resolving power of the vehicle-mounted optical lens itself is also higher and higher. In addition, for safety considerations, the vehicle-mounted optical lens applied in the automatic driving field has high requirements for stability and needs to be able to cope with various harsh environments to avoid significant performance degradation of the lens in different environments.

[0003] The optical lens in the prior art can achieve a definition of one million pixels, but the aberration problems such as chromatic aberration, astigmatism, distortion and the like of the optical lens are more serious. Moreover, the light transmission capacity is not strong, and in the environment with weak light such as night or rainy day, the amount of light entering is small. At the same time, in high and low temperature environments, there will be adverse effects such as unclear image, and the thermal stability of the optical lens is poor. After recovering from high temperature to normal temperature, the resolving power is also difficult to meet the requirements, and the cost is high and the quality is heavy. SUMMARY

[0004] The present application aims to solve the aberration problems such as chromatic aberration, astigmatism, distortion and the like of the existing optical lens, and provides 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 transmission capacity, low cost, miniaturization, good imaging quality and the like. At the same time, the details of the object can also be captured well, the ability of the optical lens to capture the details of the photographed object is improved, the image quality of the optical lens is improved, the resolution and imaging definition of the optical lens are improved, so as to meet the requirements of automatic driving applications.

[0005] In order to solve the above technical problems, the present application provides the following technical scheme:

[0006] A vehicle-mounted optical imaging system 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.

[0007] The first lens has a negative focal power, the object side surface thereof is a convex surface, and the image side surface thereof is a concave surface.

[0008] The second lens has a focal power.

[0009] The third lens has a focal power.

[0010] The fourth lens has positive refractive power, its object side surface is convex, and its image side surface is convex.

[0011] The fifth lens has refractive power, its object side surface is convex, and its image side surface is convex.

[0012] The sixth lens has negative refractive power, its object side surface is concave.

[0013] The seventh lens has positive refractive power, its object side surface is convex.

[0014] Further, the vehicle-mounted optical imaging system satisfies the following relationship:

[0015] -3.0 < f123 / f < -0.7;

[0016] 1.8 < (f-f12) / f < 4.0;

[0017] 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.

[0018] Further, the vehicle-mounted optical imaging system satisfies the following relationship:

[0019] 1.4 < f / EPD ≤ 1.7;

[0020] 27 < TTL / ImgH*DT11 < 37;

[0021] 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 surface 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 surface of the first lens.

[0022] Further, the vehicle-mounted optical imaging system satisfies the following relationship:

[0023] 1.5 < DT11 / DT72 < 2.2;

[0024] 3.1 < DT11 / SAG1 < 4.7;

[0025] wherein DT11 is the maximum effective radius of the object side surface of the first lens, DT72 is the maximum effective radius of the image side surface of the seventh lens, and SAG1 is the distance from the maximum effective clear aperture of the object side surface of the first lens to the intersection point of the object side surface of the first lens and the optical axis in the direction parallel to the optical axis.

[0026] Further, the vehicle-mounted optical imaging system satisfies the following relationship:

[0027] 2.0 < f45 / f < 5.0;

[0028] wherein, f is an effective focal length of the optical imaging system, f45 is a combined focal length of the fourth lens and the fifth lens.

[0029] Further, the vehicle-mounted optical imaging system satisfies the following relationship:

[0030] -2.7 < (SAG11-SAG12) / CT6 < -1.3;

[0031] 3.6 < CT3 / |SAG6| < 7.5;

[0032] wherein, CT6 is a thickness of the sixth lens on the optical axis, SAG6 is a distance from a maximum effective clear aperture of the image side of the third lens to a point of intersection of the image side of the third lens and the optical axis in a direction parallel to the optical axis, SAG11 is a distance from a maximum effective clear aperture of the object side of the sixth lens to a point of intersection of the object side of the sixth lens and the optical axis in a direction parallel to the optical axis, and SAG12 is a distance from a maximum effective clear aperture of the image side of the sixth lens to a point of intersection of the image side of the sixth lens and the optical axis in a direction parallel to the optical axis.

[0033] Further, the vehicle-mounted optical imaging system satisfies the following relationship:

[0034] -1.7 < R10 / CT5 < -0.9;

[0035] -2.0 < R4 / f ≤ 0.9;

[0036] wherein, R4 is a radius of curvature of the image side of the second lens, R10 is a radius of curvature of the image side of the fifth lens, f is an effective focal length of the optical imaging system, and CT5 is a thickness of the fifth lens on the optical axis.

[0037] Further, the vehicle-mounted optical imaging system satisfies the following relationship:

[0038] 0.4 < (T12+CT2) / (T23+CT3) < 3.7;

[0039] wherein, T12 is a distance from the image side of the first lens to the object side of the second lens on the optical axis, T23 is a distance from the image side of the second lens to the object side of the third lens on the optical axis, CT2 is a thickness of the second lens on the optical axis, and CT3 is a thickness of the third lens on the optical axis.

[0040] Further, the F number of the vehicle-mounted optical imaging system is 1.4-1.7, and an optical total length of the vehicle-mounted optical imaging system is ≤22 mm.

[0041] 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.

[0042] In another aspect, the embodiments of the present application also provide a camera module, which at least comprises an optical lens, and the optical lens is internally mounted with the vehicle-mounted optical imaging system.

[0043] Compared with the prior art, the beneficial effects of the present application are as follows:

[0044] The present application provides a vehicle-mounted optical imaging system and a camera module applied by the same, which is composed of seven lenses. The first lens has a negative focal power, the object side surface thereof is a convex surface, and the image side surface thereof is a concave surface. The second lens has a focal power. The third lens has a focal power. The fourth lens has a positive focal power, the object side surface thereof is a convex surface, and the image side surface thereof is a convex surface. The fifth lens has a focal power, the object side surface thereof is a convex surface, and the image side surface thereof is a convex surface. The sixth lens has a negative focal power, the object side surface thereof is a concave surface. The seventh lens has a positive focal power, the 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. Meanwhile, the optical lens can also capture the detailed information of an object, improve the ability of the optical lens to capture the details of the object, improve the quality of the optical lens, and improve the resolution and imaging clarity of the optical lens, so as to meet the requirements of automatic driving applications. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the embodiment description will be briefly introduced.

[0046] Figure 1 is a structural schematic diagram of the optical imaging system or the camera module of the embodiment 1 of the present application;

[0047] Figure 2 is the on-axis chromatic aberration, astigmatism and distortion curve of the optical imaging system or the camera module of the embodiment 1 of the present application;

[0048] Figure 3 is a structural schematic diagram of the optical imaging system or the camera module of the embodiment 2 of the present application;

[0049] Figure 4 is the on-axis chromatic aberration, astigmatism and distortion curve of the optical imaging system or the camera module of the embodiment 2 of the present application;

[0050] Figure 5 is a structural schematic diagram of the optical imaging system or the camera module of the embodiment 3 of the present application;

[0051] Figure 6 is the on-axis chromatic aberration, astigmatism and distortion curve of the optical imaging system or the camera module of the embodiment 3 of the present application;

[0052] Figure 7 is a structural schematic diagram of an optical imaging system or camera module of embodiment 4 of the present application;

[0053] Figure 8 is an on-axis chromatic aberration, astigmatism and distortion curve of the optical imaging system or camera module of embodiment 4 of the present application. DETAILED DESCRIPTION

[0054] As shown in Figures 1-8 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 an object plane to an image plane along an optical axis.

[0055] The first lens has a negative focal power, and its object side surface is a convex surface and its image side surface is a concave surface.

[0056] The second lens has a focal power.

[0057] The third lens has a focal power.

[0058] The fourth lens has a positive focal power, and its object side surface is a convex surface and its image side surface is a convex surface.

[0059] The fifth lens has a focal power, and its object side surface is a convex surface and its image side surface is a convex surface.

[0060] The sixth lens has a negative focal power, and its object side surface is a concave surface.

[0061] The seventh lens has a positive focal power, and its object side surface is a convex surface.

[0062] The vehicle-mounted optical imaging system disclosed by the embodiment of the present application is composed of seven lenses. 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, etc. At the same time, it can also capture the details of the object well, improve the ability of the optical lens to capture the details of the photographed object, improve the quality of the optical lens, improve the resolution and imaging clarity of the optical lens, and meet the requirements of automatic driving applications.

[0063] Further, the vehicle-mounted optical imaging system satisfies the following relationship: 1.4 < f / EPD ≤ 1.7, 27 < TTL / ImgH*DT11 < 37, wherein f is an effective focal length of the optical imaging system, EPD is an entrance pupil diameter of the optical imaging lens, TTL is an on-axis distance from a first lens object side to an imaging surface, ImgH is half of a diagonal line length of an effective pixel area on the imaging surface, and DT11 is a maximum effective radius of the first lens object side. By controlling the ratio of TTL / ImgH, the optical system has good thinness characteristics, and by adding the limitation of the maximum effective radius of the first lens of the optical system, the optical system has the characteristics of a small caliber at the front end, ensuring that the optical system has the characteristics of a large aperture, miniaturization, and thinness. When below the lower limit of the relationship, the TTL of the optical lens increases on the basis of ensuring that the optical lens has a small caliber, which is not conducive to the miniaturization of the lens. When exceeding the upper limit of the relationship, it is not conducive to the expansion of the imaging surface of the optical imaging system, reducing the resolution and imaging resolving power of the optical system.

[0064] Further, the vehicle-mounted optical imaging system satisfies the following relationship: 1.5 < DT11 / DT72 < 2.2, wherein DT11 is a maximum effective radius of a first lens object side, and DT72 is a maximum effective radius of a seventh lens image side. By constraining the ratio of the maximum effective radius of the first lens object side and the maximum effective radius of the seventh lens image side, the caliber relationship of the first lens and the eighth lens under a large field of view angle can be reasonably controlled, so that the maximum effective radius of the first lens is kept within a reasonable range, so that the optical lens has the characteristics of a small caliber. When below the lower limit of the relationship, the caliber difference between the first lens and the seventh lens is reduced, which is not conducive to the reduction and compactness of the optical system head. When exceeding the upper limit of the relationship, the caliber of the seventh lens is excessively compressed, which is not conducive to the improvement of the image quality of the optical system and the correction of distortion.

[0065] Further, the vehicle-mounted optical imaging system satisfies the following relationship: -3.0 < f123 / f < -0.7, wherein f123 is an effective combined focal length of the first lens, the second lens, and the third lens, and f is an effective focal length of the optical imaging system. By constraining the ratio of the combined focal length of the first lens, the second lens, and the third lens to the effective focal length of the optical lens, the optical power of the optical system can be more reasonably distributed to the first lens, the second lens, and the third lens, reducing the optical power pressure of the first lens, which helps to reduce the caliber of the first lens and meet the characteristics of a small caliber. At the same time, light rays can be quickly converged, so as to refract paraxial rays at a low deflection angle, reducing spherical aberration.

[0066] Further, the vehicle-mounted optical imaging system satisfies the following relationship: -2.7 < (SAG11-SAG12) / CT6 < -1.3; wherein CT6 is the thickness of the sixth lens on the optical axis, SAG11 is the distance from the maximum effective light aperture on 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 light aperture on 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. By limiting the range of the above condition formula, the ratio of the sagittal height of the object side and the image side of the sixth lens to the center thickness can be reasonably configured, so that the shape of the sixth lens is reasonably controlled, so that the surface of the sixth lens is not too curved, which is beneficial to reduce the tolerance sensitivity of the sixth lens, and then is beneficial to the processing and molding of the sixth lens, and better realizes the engineering manufacturing.

[0067] Further, the vehicle-mounted optical imaging system satisfies the following relationship: -1.7 < R10 / CT5 < -0.9, wherein R10 is the curvature radius of the image side of the fifth lens, and CT5 is the thickness of the fifth lens on the optical axis. By limiting the range of the ratio of the curvature radius of the image side of the fifth lens to the thickness of the fifth lens on the optical axis, it is beneficial to reasonably deflect the light in the fifth lens, and then it is beneficial to improve the system MTF, so as to improve the resolving power of the system imaging. Below the lower limit of the above condition formula, the curvature radius of the image side of the fifth lens is too large, which causes the light to be easily reflected on the image side of the fifth lens and increases the risk of ghost image. Exceeding the upper limit of the above condition formula, the center thickness of the fifth lens is too large, which causes the deflection of the light in the fifth lens to be unreasonable, which is not conducive to the improvement of the system MTF.

[0068] Further, the vehicle-mounted optical imaging system satisfies the following relationship: -2.0 < R4 / f ≤ 0.9, wherein R4 is the curvature radius of the image side of the second lens, and f is the effective focal length of the optical imaging system. By limiting the range of the above relationship, it is beneficial to constrain the bending degree of the image side of the second lens, so that more light enters the optical system, and 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 relationship, the focal length of the optical system is too large, which is not conducive to the realization of the miniaturization characteristic, and then affects the thinness of the entire optical system; exceeding the upper limit of the relationship, the curvature radius of the image side of the second lens is too small, the image side of the second lens is too curved, and then the risk of ghost image is increased.

[0069] Further, the vehicle-mounted optical imaging system satisfies the following relationship: 3.6 < CT3 / |SAG6| < 7.5, wherein CT3 is the thickness of the third lens on the optical axis, and SAG6 is the distance from the maximum effective aperture of the image side surface of the third lens to the intersection point of the image side surface of the third lens and the optical axis in the direction parallel to the optical axis. By controlling the ratio of the central thickness of the third lens to the sag of the image side surface of the third lens, the third lens can satisfy the condition of having a higher refractive power while avoiding the central thickness of the third lens being too large or the image side surface being too curved, thereby reducing the production cost of the third lens. When the ratio is less than the lower limit of the above relationship, the image side surface of the third lens is too curved, which increases the processing difficulty of the third lens and further increases the production cost. When the ratio exceeds the upper limit of the above relationship, the thickness of the third lens is too large, which is not conducive to the light weight and miniaturization of the optical lens.

[0070] Further, 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. When the optical system satisfies the above condition, it is conducive to correcting the high-order aberration of the system, improving the imaging resolution, and ensuring the compactness of the system structure to meet the miniaturization requirement. 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 aberration of the optical system, thereby reducing the imaging quality, and the excessive air gap and lens thickness setting will increase the total length of the optical system, which is not conducive to the miniaturization of the optical system.

[0071] Further, the vehicle-mounted optical imaging system satisfies the following relationship: 3.1 < DT11 / SAG1 < 4.7, wherein DT11 is the maximum effective radius of the object side surface of the first lens, and SAG1 is the distance from the maximum effective aperture of the object side surface of the first lens to the intersection point of the object side surface of the first lens and the optical axis in the direction parallel to the optical axis. By controlling the ratio of the above sub-formula, it is conducive to reducing the risk of aberration generated by the edge of the first lens and avoiding the object side surface of the first lens being too curved, thereby reducing the manufacturing difficulty of the first lens. When the ratio is less than the lower limit of the relationship, the sag of the object side surface of the first lens is too large, which causes the object side surface of the first lens to be too curved, increases the manufacturing difficulty, and easily causes the deflection of the edge light to be serious, which is not conducive to correcting the aberration of the optical system, thereby reducing the imaging quality of the optical system. When the ratio exceeds the upper limit of the relationship, the maximum effective radius of the object side surface of the third lens increases, which increases the aperture of the first lens and is not conducive to the miniaturization of the optical system.

[0072] Further, the vehicle-mounted optical imaging system satisfies the following relationship: 1.8 < (f-f12) / f < 4.0, wherein f is an effective focal length of the optical imaging system, and f12 is an effective combined focal length of the first lens and the second lens. By reasonably controlling the range of the ratio 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 while also obtaining a higher imaging resolution. Exceeding the upper limit of the relationship, the second lens has insufficient refractive power, and it is difficult for light at a large angle to be incident to the optical system, which is not conducive to expanding the field of view range of the optical system; below the lower limit of the relationship, the second lens has too strong refractive power, which is prone to produce strong astigmatism and chromatic aberration, which is not conducive to high-resolution imaging characteristics.

[0073] Further, the vehicle-mounted optical imaging system satisfies the following relationship: 2.0 < f45 / f < 5.0, wherein f45 is a combined focal length of the fourth lens and the fifth lens, and f is an 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 power and surface shape of the fourth lens and the fifth lens can be reasonably distributed, thereby controlling off-axis aberration and improving imaging quality; at the same time, it avoids the surface shape of the fourth lens and the fifth lens being too curved, thereby increasing the manufacturing difficulty.

[0074] In the specific embodiments of the present application, in example one, example two and example three, the second lens, the fourth lens and the seventh lens are aspherical lenses, and the others are spherical lenses, and all are separated and arranged with air as a spacer; in example four, the third lens, the fourth lens and the seventh lens are aspherical lenses, and the others are spherical lenses, and all are separated and arranged with air as a spacer; the F number of the optical imaging system is 1.4-1.7; the total optical length of the optical imaging system is ≤22 mm. The example of the present application discloses a vehicle-mounted optical imaging system, by selecting three aspherical lenses and four spherical lenses, and 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, etc., and can also capture the details of the object, improve the ability of the optical lens to capture the 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 automatic driving applications.

[0075] Example one,

[0076] The following refers to Figures 1-2 An optical imaging lens according to example 1 of the present application is described. Figure 1 A structure schematic diagram of the optical imaging lens according to example 1 of the present application is shown.

[0077] As Figure 1As 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, an 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.

[0078] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being convex. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being convex and its image-side surface S10 being convex. The sixth lens E6 has negative optical power, with its object-side surface S10 being concave and its image-side surface S11 being convex. The seventh lens E7 has positive optical power, with its object-side surface S12 being convex and its image-side surface S13 being concave. The filter E8 has an object-side surface S14 and an image-side surface S15. Light from an object sequentially passes through surfaces S1 to S15 and is ultimately imaged on an imaging surface S16.

[0079] Table 1 shows the surface type, curvature radius, thickness, and material of each lens of the optical imaging lens system of Example 1, wherein the units of curvature radius and thickness are both millimeters (mm).

[0080] Table 1

[0081]

[0082] In Table 1, the object side surface and the image side surface of any one of the second lens element E2, the fourth lens element E4, and the seventh lens element E7 are all Q-type aspherical surfaces. The surface shape of each aspherical lens element can be defined by, but is not limited to, the following aspherical surface formula:

[0083]

[0084] Where Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, r is the radial coordinate of the aspheric surface, c is the curvature of the aspheric vertex, K is the cone coefficient, Am is the aspheric coefficient, r is the radius of the aspheric surface, and c is the curvature of the aspheric vertex. max is the maximum radial radius coordinate, u=r / r max Table 2 shows the conic coefficients and higher-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 first embodiment.

[0085] Table 2

[0086]

[0087] Figure 2 The axial chromatic aberration, astigmatism and distortion curves of the optical imaging lens of Embodiment 1 are shown. The axial chromatic aberration represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens; the astigmatism represents the meridional image surface curvature and sagittal image surface curvature; the distortion represents the distortion size values corresponding to different image heights. The optical imaging lens of Embodiment 1 can achieve good imaging quality.

[0088] Embodiment two,

[0089] Referring to Figures 3-4 An optical imaging lens according to Embodiment 2 of the present application is described. Figure 3 A structural schematic diagram of the optical imaging lens according to Embodiment 2 of the present application is shown.

[0090] As Figure 3 shown, the optical imaging lens according to the exemplary embodiments 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, an 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.

[0091] The first lens E1 has a negative focal power, the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface. The second lens E2 has a negative focal power, the object side surface S3 is a concave surface, and the image side surface S4 is a convex surface. The third lens E3 has a positive focal power, the object side surface S5 is a convex surface, and the image side surface S6 is a convex surface. The fourth lens E4 has a positive focal power, the object side surface S7 is a convex surface, and the image side surface S8 is a convex surface. The fifth lens E5 has a positive focal power, the object side surface S9 is a convex surface, and the image side surface S10 is a convex surface. The sixth lens E6 has a negative focal power, the object side surface S10 is a concave surface, and the image side surface S11 is a concave surface. The seventh lens E7 has a positive focal power, the object side surface S12 is a convex surface, and the image side surface S13 is a convex surface. The filter E8 has an object side surface S14 and an image side surface S15. Light from an object sequentially passes through each surface S1 to S15 and is finally imaged on the imaging surface S16.

[0092] 3 shows the surface type, curvature radius, thickness and material of each lens of the optical imaging lens of Embodiment 2, wherein the units of the curvature radius and the thickness are millimeters (mm).

[0093] Table 3

[0094]

[0095] In Table 3, the object side surface and the image side surface of any one lens of the second lens E2, the fourth lens E4 and the seventh lens E7 are Q type aspheric surfaces, and the surface type of each aspheric lens can be defined by, but is not limited to, the following aspheric surface formula:

[0096]

[0097] wherein Z is the distance from the corresponding point on the asphere to the plane tangent to the vertex of the surface, r is the radial coordinate of the asphere, c is the curvature of the vertex of the asphere, K is the conic constant, Amis the asphere coefficient, r max is the maximum radial radius coordinate, and u = r / r max Table 4 gives the conic constant and the higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 of each asphere that can be used in the second embodiment.

[0098] Table 4

[0099]

[0100] Figure 4 The axial chromatic aberration, the astigmatism, and the distortion curves of the optical imaging lens of Example 2 are shown. The axial chromatic aberration represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens; the astigmatism represents the meridional image surface curvature and the sagittal image surface curvature; and the distortion represents the distortion size values corresponding to different image heights. The optical imaging lens of Example 2 can achieve good imaging quality.

[0101] Example Three,

[0102] The optical imaging lens according to the third embodiment of the present application is described below with reference to Figures 5-6 The structure of the optical imaging lens according to the third embodiment of the present application is shown. Figure 5 The structure of the optical imaging lens according to the third embodiment of the present application is shown.

[0103] As shown in Figure 5 the optical imaging lens according to the exemplary embodiments 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, an 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.

[0104] The first lens E1 has negative focal power, the object side surface S1 is convex, and the image side surface S2 is concave. The second lens E2 has positive focal power, the object side surface S3 is concave, and the image side surface S4 is convex. The third lens E3 has negative focal power, the object side surface S5 is concave, and the image side surface S6 is convex. The fourth lens E4 has positive focal power, the object side surface S7 is convex, and the image side surface S8 is convex. The fifth lens E5 has positive focal power, the object side surface S9 is convex, and the image side surface S10 is convex. The sixth lens E6 has negative focal power, the object side surface S10 is concave, and the image side surface S11 is convex. The seventh lens E7 has positive focal power, the object side surface S12 is convex, and the image side surface S13 is concave. The filter E8 has an object side surface S14 and an image side surface S15. Light from an object passes through the surfaces S1 to S15 in sequence and is finally imaged on an image plane S16.

[0105] Table 5 shows the surface type, the radius of curvature, the thickness and the material of each lens of the optical imaging lens of Example 3, wherein the units of the radius of curvature and the thickness are millimeter (mm).

[0106] Table 5

[0107]

[0108] In Table 5, the object side surface and the image side surface of each of the second lens E2, the fourth lens E4 and the seventh lens E7 are Q type aspheric surfaces, and the surface type of each aspheric surface can be defined by, but not limited to, the following aspheric surface formula:

[0109]

[0110] wherein Z is the distance from a corresponding point on the aspheric surface to a plane tangent to the vertex of the surface, r is the radial coordinate of the aspheric surface, c is the curvature of the vertex of the aspheric surface, K is the conic coefficient, Am is the aspheric coefficient, r max is the maximum value of the radial radius coordinate, and u = r / r max Table 6 shows the conic coefficient and the 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.

[0111] Table 6

[0112]

[0113] Figure 6The on-axis chromatic aberration, astigmatism and distortion curves of the optical imaging lens of Embodiment 3 are shown. The on-axis chromatic aberration represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens; the astigmatism represents the meridional image surface curvature and sagittal image surface curvature; the distortion represents the distortion size values corresponding to different image heights. The optical imaging lens of Embodiment 3 can achieve good imaging quality.

[0114] Embodiment Four,

[0115] The following refers to Figures 7-8 An optical imaging lens according to Embodiment 4 of the present application is described. Figure 7 A structural schematic diagram of the optical imaging lens according to Embodiment 4 of the present application is shown.

[0116] As Figure 7 shown, the optical imaging lens according to the exemplary embodiments 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 fourth lens E4, an STO, a fifth lens E5, a sixth lens E6, a seventh lens E7, an infrared filter E8, and an imaging surface S16.

[0117] The first lens E1 has a negative refractive power, the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface. The second lens E2 has a negative refractive power, the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface. The third lens E3 has a negative refractive power, the object side surface S5 is a concave surface, and the image side surface S6 is a convex surface. The fourth lens E4 has a positive refractive power, the object side surface S7 is a convex surface, and the image side surface S8 is a convex surface. The fifth lens E5 has a positive refractive power, the object side surface S9 is a convex surface, and the image side surface S10 is a convex surface. The sixth lens E6 has a negative refractive power, the object side surface S10 is a concave surface, and the image side surface S11 is a concave surface. The seventh lens E7 has a positive refractive power, the object side surface S12 is a convex surface, and the image side surface S13 is a convex surface. The filter E8 has an object side surface S14 and an image side surface S15. Light from an object sequentially passes through each surface S1 to S15 and is finally imaged on the imaging surface S16.

[0118] Table 7 shows the surface type, curvature radius, thickness and material of each lens of the optical imaging lens of Embodiment 4, wherein the units of the curvature radius and the thickness are millimeters (mm).

[0119] Table 7

[0120]

[0121] 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 Q-type aspheric surfaces, and the surface type of each aspheric lens can be defined by, but is not limited to, the following aspheric surface formula

[0122]

[0123] wherein Z is the distance from the corresponding point on the asphere to the plane tangent to the vertex of the surface, r is the radial coordinate of the asphere, c is the curvature of the vertex of the asphere, K is the conic constant, Am is the asphere coefficient, r max is the maximum radial radius coordinate, and u = r / r max Table 8 gives the conic constant and the higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28 and A30 of each asphere that can be used in the fourth embodiment.

[0124] Table 8

[0125]

[0126] Figure 8 The axial chromatic aberration, the astigmatism and the distortion curves of the optical imaging lens of embodiment 4 are shown. The axial chromatic aberration represents the deviation of the convergent focal points of light rays of different wavelengths after passing through the lens; the astigmatism represents the meridional image surface curvature and the sagittal image surface curvature; the distortion represents the distortion size values corresponding to different image heights. The optical imaging lens of embodiment 4 can achieve good imaging quality.

[0127] In embodiments 1-4, the basic data are as follows:

[0128] Table 9

[0129]

[0130] In embodiments 1-4, each conditional expression satisfies the conditions in the following table:

[0131] Table 10

[0132]

[0133] A camera module at least includes an optical lens, and the optical lens is installed with the vehicle-mounted optical imaging system described above. By selecting a proper number of lenses and reasonably configuring the refractive power and surface shape of each lens, the optical lens has the characteristics of large light quantity, low cost, miniaturization, good imaging quality, etc. Meanwhile, the optical lens can also capture the details of the object well, improve the ability of the optical lens to capture the details of the photographed object, improve the image quality of the optical lens, improve the resolution and imaging clarity of the optical lens, and meet the requirements of automatic driving applications.

[0134] The above is one or more embodiments provided in combination with specific content, and does not mean that the specific implementation of the present application is limited to these descriptions. Any approximation, similarity or replacement of the method and structure of the present application, or any technical deduction or replacement made on the basis of the concept of the present application, should be considered as the protection scope of the present application.

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 the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens; The first lens has negative optical power, its object side surface is convex, and its image side surface is concave; The fourth lens has positive refractive power, its object-side surface is convex, and its image-side surface is convex; The object side surface of the fifth lens is convex, and the image side surface thereof 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 second lens has negative optical power, and at least one of the third lens and the fifth lens has positive optical power, or the second lens has positive optical power, the third lens has negative optical power, and the fifth lens has positive optical power; The vehicle-mounted optical imaging system satisfies the following relationship: -3.0 < f123 / f ≤ -1.96; 1.8 < (f-f12) / f ≤2.62; -2.0 < R4 / f ≤-1.15; Where, f is the effective focal length of the optical imaging system, f12 is the effective combined focal length of the first and second lenses, f123 is the effective combined focal length of the first, second, and third lenses, and R4 is the curvature radius of the image-side surface of the second lens.

2. The vehicle-mounted optical imaging system according to claim 1, wherein: 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 on-axis distance from the object side of the first lens to the imaging surface, ImgH is half 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, wherein: 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 objective 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 objective side of the first lens to the intersection of the objective 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, wherein: 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, wherein: 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, wherein: The vehicle-mounted optical imaging system satisfies the following relationship: -1.7 < R10 / CT5 < -0.9; Wherein, R10 is the curvature radius of the image-side surface of the fifth lens, and CT5 is the thickness of the fifth lens on the optical axis.

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

8. The vehicle-mounted optical imaging system according to claim 1, wherein: 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, wherein: The fourth lens and the seventh lens are aspherical lenses, either the second lens or 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.

Images