A vehicle-mounted high-definition surround-view optical imaging system and its application camera module

Abstract

This invention provides a vehicle-mounted high-definition surround-view optical imaging system and its application camera module, which is mainly composed of 7 lenses. Through the reasonable combination of lens shape and optical power, it has the advantages of high pixel count, wide angle and weak ghosting. It has a compact structure, is easy to process and install, and at the same time, it has high pixel count and stable imaging quality under high and low temperature conditions.

Description

Technical Field

[0001] This application relates to the field of optical imaging, and in particular to a vehicle-mounted high-definition surround-view optical imaging system and its application camera module. Background Technology

[0002] In recent years, with the continuous development of intelligent driving systems, in-vehicle surround-view cameras have become one of the most popular applications of intelligent driver assistance systems, and the market size has gradually increased. However, current in-vehicle surround-view cameras on the market suffer from problems such as complex lens structures and poor image quality, making it difficult to meet user needs. Therefore, designing and manufacturing high-pixel, stable-image-quality in-vehicle surround-view cameras is of great significance. Summary of the Invention

[0003] This application aims to address the technical shortcomings of existing surround-view vehicle lenses, such as complex structure and poor image quality. It provides an ultra-high-definition surround-view vehicle optical imaging system with advantages of high pixel count, wide angle, and weak ghosting. At the same time, it maintains high pixel count and stable image quality under both high and low temperatures.

[0004] A vehicle-mounted high-definition surround-view optical imaging system includes, along the optical axis from the object plane to the image plane, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens.

[0005] The first lens has negative optical power, its object side is convex, and its image side is concave.

[0006] The second lens has negative optical power, and its image-side surface is concave.

[0007] The third lens has positive optical power, its object side is concave, and its image side is convex.

[0008] The fourth lens has positive optical power and its object side is convex.

[0009] The fifth lens has positive optical power, its object side is concave, and its image side is convex.

[0010] The sixth lens has positive optical power, and its object side is convex, and its image side is convex.

[0011] The seventh lens has negative optical power, its object side is concave, and its image side is convex.

[0012] Preferably, the optical imaging system satisfies the following relationship: 12 <TTL / f<14;

[0013] Where TTL is the distance from the object-side surface of the first lens of the optical imaging system to the image plane, and f is the effective focal length of the optical imaging system.

[0014] Preferably, the optical imaging system satisfies the following relationship:

[0015] -5 <f1 / f<-3.5;

[0016] -4 <f2 / f<-3;

[0017] 8 <f3 / f<11;

[0018] 6 <f4 / f<8.5;

[0019] 4 <f5 / f<5;

[0020] 2 <f6 / f<3;

[0021] -3 <f7 / f<-2;

[0022] Where f is the effective focal length of the optical imaging system, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens.

[0023] Preferably, the optical imaging system satisfies the following relationship:

[0024] 2.5 < |R11 / R12| < 3.2;

[0025] 2.0 < | R31 / R32 | < 5.0;

[0026] 0 < |R41 / R42| < 1.0;

[0027] 2.0 < | R51 / R52 | < 4.0;

[0028] 0 < |R61 / R62| < 2.0;

[0029] 0 < | R71 / R72 | < 1.0;

[0030] Wherein, R11 is the object-side radius of curvature of the first lens, R12 is the image-side radius of curvature of the first lens; R31 is the object-side radius of curvature of the third lens, R32 is the image-side radius of curvature of the third lens; R41 is the object-side radius of curvature of the fourth lens, R42 is the image-side radius of curvature of the fourth lens; R51 is the object-side radius of curvature of the fifth lens, R52 is the image-side radius of curvature of the fifth lens; R61 is the object-side radius of curvature of the sixth lens, R62 is the image-side radius of curvature of the sixth lens; R71 is the object-side radius of curvature of the seventh lens, R72 is the image-side radius of curvature of the seventh lens.

[0031] Preferably, the optical imaging system satisfies the following relationship:

[0032] 1.7 <nd1<2.05;

[0033] 1.5 <nd2<1.7;

[0034] 1.6 <nd3<2.0;

[0035] 1.5 <nd4<1.8;

[0036] 1.5 <nd5<1.65;

[0037] 1.5 <nd6<1.65;

[0038] 1.7 <nd7<2.0;

[0039] Wherein, nd1 is the refractive index of the first lens; nd2 is the refractive index of the second lens; nd3 is the refractive index of the third lens; nd4 is the refractive index of the fourth lens; nd5 is the refractive index of the fifth lens; nd6 is the refractive index of the sixth lens; and nd7 is the refractive index of the seventh lens.

[0040] Preferably, the optical imaging system satisfies the following relationship:

[0041] 20 <vd1<60;

[0042] 30 <vd2<70;

[0043] 20 <vd3<70;

[0044] 20 <vd4<70;

[0045] 35 <vd5<70;

[0046] 35 <vd6<70;

[0047] 20 <vd7<60;

[0048] Wherein, vd1 is the Abbe number of the first lens, vd2 is the Abbe number of the second lens, vd3 is the Abbe number of the third lens, vd4 is the Abbe number of the fourth lens, vd5 is the Abbe number of the fifth lens, vd6 is the Abbe number of the sixth lens, and vd7 is the Abbe number of the seventh lens.

[0049] Preferably, the optical imaging system satisfies the following relationship:

[0050] (dn / dt)6 < -6.0 (10 -06 / ℃);

[0051] Where (dn / dt)6 is the coefficient of refractive index of the sixth lens as a function of temperature.

[0052] Preferably, the optical imaging system satisfies the following relationship: |f123 / f567|≤1;

[0053] Where f123 is the combined focal length of the first, second, and third lenses, and f567 is the combined focal length of the fifth, sixth, and seventh lenses.

[0054] Preferably, the optical imaging system satisfies the following relationship: TTL / EPD < 27;

[0055] Where TTL is the distance from the object-side surface of the first lens of the optical imaging system to the image plane, and EPD is the entrance pupil diameter of the optical imaging system.

[0056] Preferably, the optical imaging system satisfies the following relationship: TTL / IH < 10;

[0057] Where TTL is the distance from the object-side surface of the first lens of the optical imaging system to the image plane, and IH is half the diameter of the largest image circle on the image plane.

[0058] On the other hand, this application embodiment also provides a camera module, which includes at least an optical lens, and the above-mentioned vehicle-mounted high-definition surround-view optical imaging system is installed in the optical lens.

[0059] Compared with the prior art, the beneficial effects of this application are as follows:

[0060] This invention provides a vehicle-mounted high-definition surround-view optical imaging system and its application camera module, which mainly consists of 7 lenses. Through the reasonable combination of lens shape and optical power, it has the advantages of high pixel count, wide angle and weak ghosting. It has a compact structure, is easy to process and install, and at the same time, it has high pixel count and stable imaging quality under high and low temperature conditions. Attached Figure Description

[0061] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0062] Figure 1 This is a schematic diagram of the structure of the optical system or camera module in Embodiment 1 of this application;

[0063] Figure 2 This refers to the astigmatism and distortion curves of the optical system or camera module in Embodiment 1 of this application;

[0064] Figure 3 This is the MTF curve of the optical system or camera module in Embodiment 1 of this application;

[0065] Figure 4 This is a schematic diagram of the structure of the optical system or camera module in Embodiment 2 of this application;

[0066] Figure 5 is the astigmatism and distortion curves of the optical system or camera module in Embodiment 2 of the present application;

[0067] Figure 6 is the MTF curve of the optical system or camera module in Embodiment 2 of the present application;

[0068] Figure 7 is the structural schematic diagram of the optical system or camera module in Embodiment 3 of the present application;

[0069] Figure 8 is the astigmatism and distortion curves of the optical system or camera module in Embodiment 3 of the present application;

[0070] Figure 9 is the MTF curve of the optical system or camera module in Embodiment 3 of the present application. Detailed implementation manners

[0071] As Figure 1-9 shown, the present application provides a vehicle-mounted high-definition surround-view optical imaging system, which includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7 arranged in sequence from the object side. The first lens has a negative optical power, its object side is convex, and its image side is concave; the second lens has a negative optical power, and its image side is concave; the third lens has a positive optical power, its object side is concave, and its image side is convex; the fourth lens has a positive optical power, and its object side is convex; the fifth lens has a positive optical power, its object side is concave, and its image side is convex; the sixth lens has a positive optical power, its object side is convex, and its image side is convex; the seventh lens has a negative optical power, its object side is concave, and its image side is convex.

[0072] The optical system of the embodiment of the present application mainly consists of 7 lenses. Through reasonable matching of the lens shapes and optical powers, it has the advantages of high pixels, large wide angle, and weak ghost images, with a compact structure, being convenient for processing and installation. At the same time, it has high pixels and stable imaging quality at high and low temperatures.

[0073] Furthermore, the optical imaging system satisfies the following condition: 12 < TTL / f < 14; where TTL is the distance from the object side surface of the first lens of the optical imaging system to the image plane, and f is the effective focal length of the optical imaging system. By reasonably balancing the relationship between the TTL of the optical imaging system and the effective focal length of the optical imaging system, while effectively increasing the maximum imaging circle, the overall size of the optical system is controlled to meet the requirements of the ultra-large wide-angle optical imaging system.

[0074] Further, the optical imaging system satisfies the following conditions: -5 < f1 / f < -3.5; -4 < f2 / f < -3; 8 < f3 / f < 11; 6 < f4 / f < 8.5; 4 < f5 / f < 5; 2 < f6 / f < 3; -3 < f7 / f < -2; where f is the effective focal length of the optical imaging system, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens. By limiting the ratio of the effective focal lengths of each lens to the effective focal length of the optical system, the optical system obtains a reasonable light deflection angle, effectively reduces the sensitivity of component tolerances, and improves the system aberration, achieving higher imaging quality.

[0075] Further, the optical imaging system satisfies the following conditions: 2.5 < |R11 / R12| < 3.2; 2.0 < |R31 / R32| < 5.0; 0 < |R41 / R42| < 1.0; 2.0 < |R51 / R52| < 4.0; 0 < |R61 / R62| < 2.0; 0 < |R71 / R72| < 1.0; where R11 is the curvature radius of the object side surface of the first lens, R12 is the curvature radius of the image side surface of the first lens; R31 is the curvature radius of the object side surface of the third lens, R32 is the curvature radius of the image side surface of the third lens; R41 is the curvature radius of the object side surface of the fourth lens, R42 is the curvature radius of the image side surface of the fourth lens; R51 is the curvature radius of the object side surface of the fifth lens, R52 is the curvature radius of the image side surface of the fifth lens; R61 is the curvature radius of the object side surface of the sixth lens, R62 is the curvature radius of the image side surface of the sixth lens; R71 is the curvature radius of the object side surface of the seventh lens, R72 is the curvature radius of the image side surface of the seventh lens; By controlling the relationship between the curvature radii of each component, the ghost images formed by reflections between lenses are effectively suppressed, and the incident angles of the chief rays of each field of view of the optical imaging lens on the image plane are relatively reasonably controlled, meeting the requirements of the incident angle of the chief ray in the optical system design, and effectively reducing the sensitivity of the system.

[0076] Further, the optical imaging system satisfies the following conditions: 1.7 < nd1 < 2.05; 1.5 < nd2 < 1.7; 1.6 < nd3 < 2.0; 1.5 < nd4 < 1.8; 1.5 < nd5 < 1.65; 1.5 < nd6 < 1.65; 1.7 < nd7 < 2.0; where nd1 is the refractive index of the first lens; nd2 is the refractive index of the second lens; nd3 is the refractive index of the third lens; nd4 is the refractive index of the fourth lens; nd5 is the refractive index of the fifth lens; nd6 is the refractive index of the sixth lens; nd7 is the refractive index of the seventh lens. By reasonably selecting the refractive indices of each component, the aberration of the optical system is reduced, and the image quality of the high-pixel optical system is improved.

[0077] Furthermore, the optical imaging system satisfies the following conditions: 20 < vd1 < 60; 30 < vd2 < 70; 20 < vd3 < 70; 20 < vd4 < 70; 35 < vd5 < 70; 35 < vd6 < 70; 20 < vd7 < 60; where, vd1 is the Abbe number of the first lens, vd2 is the Abbe number of the second lens, vd3 is the Abbe number of the third lens, vd4 is the Abbe number of the fourth lens, vd5 is the Abbe number of the fifth lens, vd6 is the Abbe number of the sixth lens, and vd7 is the Abbe number of the seventh lens. By reasonably selecting the Abbe numbers of each component, the aberration of the optical system is reduced, and the image quality of the high-pixel optical system is improved.

[0078] Furthermore, the optical imaging system satisfies the following condition: (dn / dt)6 < -6.0 (10 -06 / °C); where, (dn / dt)6 is the refractive index temperature coefficient of the sixth lens. By reasonably selecting the refractive index temperature coefficient of the sixth lens, the overall temperature compensation of the optical system is corrected, which is beneficial to maintaining good imaging quality of the optical imaging system at high and low temperatures.

[0079] Furthermore, the optical imaging system satisfies the following condition: |f123 / f567| ≤ 1; where, f123 is the combined focal length of the first lens, the second lens, and the third lens, and f567 is the combined focal length of the fifth lens, the sixth lens, and the seventh lens. By controlling the relationship of the focal lengths between the lenses, the vehicle-mounted optical system has an ultra-wide angle and a small aperture, and has good imaging quality at high and low temperatures.

[0080] Furthermore, the optical imaging system satisfies the following condition: TTL / EPD < 27; where, TTL is the distance from the object side surface of the first lens of the optical imaging system to the image plane, and EPD is the entrance pupil diameter of the optical imaging system. By limiting the relationship between TTL and the entrance pupil diameter EPD of the optical imaging system, the aberration of the system is finely adjusted and controlled, and then the imaging quality of the system is effectively improved, and the miniaturization of the ultra-wide angle optical imaging system is realized.

[0081] Furthermore, the optical imaging system satisfies the following condition: TTL / IH < 10; where, TTL is the distance from the object side surface of the first lens of the optical imaging system to the image plane, and IH is half of the maximum image circle diameter on the image plane. By limiting the relationship between TTL and the maximum image circle of the optical imaging system, it is beneficial to increase the maximum field angle and the maximum image circle.

[0082] Example 1

[0083] The following refers to Figures 1 to 3 Describe the optical imaging lens according to Embodiment 1 of the present application. Figure 1 Fig. shows a schematic structural diagram of the optical imaging lens according to Embodiment of the present application.

[0084] like Figure 1 As shown, the optical imaging lens according to an exemplary embodiment of this application includes, in sequence 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 aperture stop STO, a fifth lens E5, a sixth lens E6, a seventh lens E7, an infrared filter E8, and an imaging surface S16.

[0085] 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 concave. The third lens E3 has positive optical power, with its object-side surface S5 being concave and its image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has positive optical power, with its object-side surface S10 being concave and its image-side surface S11 being convex. The sixth lens E6 has positive optical power, with its object-side surface S12 being convex and its image-side surface S13 being convex. The seventh lens E7 has negative optical power, with its object-side surface S13 being concave and its image-side surface S14 being convex. The filter E8 has an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged on the imaging surface S17.

[0086] Table 1 shows the surface type, radius of curvature, thickness, and material of each lens in the optical imaging lens of Example 1, wherein the units for radius of curvature and thickness are millimeters (mm).

[0087] Table 1

[0088]

[0089] In Table 1, the object-side surface and image-side surface of any one of the lenses of the fifth lens E5 are aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formulas:

[0090]

[0091] Where x is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the vertex of the aspherical surface, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th higher-order term in the aspherical surface shape formula. Table 2 gives the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 that can be used for each aspherical surface in Example 1.

[0092] Table 2

[0093]

[0094] Figure 2The astigmatism and distortion curves of the optical imaging lens of Example 1 are shown. Astigmatism represents the meridional image plane curvature and the sagittal image plane curvature; distortion represents the distortion magnitude corresponding to different image heights.

[0095] Figure 3 The MTF curve of the optical imaging lens of Example 1 is shown, which represents the MTF values ​​in the meridional and sagittal directions of different fields of view at different spatial frequencies.

[0096] The optical imaging lens given in Example 1 can achieve good imaging quality.

[0097] Example 2

[0098] The following is for reference Figures 4 to 6 Describes an optical imaging lens according to Embodiment 2 of this application. Figure 4 A schematic diagram of the structure of an optical imaging lens according to Embodiment 2 of this application is shown.

[0099] like Figure 4 As shown, the optical imaging lens according to an exemplary embodiment of this application includes, in sequence 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 aperture stop STO, a fifth lens E5, a sixth lens E6, a seventh lens E7, an infrared filter E8, and an imaging surface S16.

[0100] 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 concave. The third lens E3 has positive optical power, with its object-side surface S5 being concave and its image-side surface S6 being convex. 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 positive optical power, with its object-side surface S10 being concave and its image-side surface S11 being convex. The sixth lens E6 has positive optical power, with its object-side surface S12 being convex and its image-side surface S13 being convex. The seventh lens E7 has negative optical power, with its object-side surface S13 being concave and its image-side surface S14 being convex. The filter E8 has an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged on the imaging surface S17.

[0101] Table 3 shows the surface type, radius of curvature, thickness, and material of each lens in the optical imaging lens of Example 2, wherein the units for radius of curvature and thickness are millimeters (mm).

[0102] Table 3

[0103]

[0104] In Table 3, the object-side and image-side surfaces of any one of the fifth lens E5 are aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formulas:

[0105]

[0106] Where x is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the vertex of the aspherical surface, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th higher-order term in the aspherical surface shape formula. Table 4 gives the conic coefficients and higher-order term coefficients A4, A6, A8, A10, A12, A14, and A16 that can be used for each aspherical surface in Example 2.

[0107] Table 4

[0108]

[0109] Figure 5 The astigmatism and distortion curves of the optical imaging lens of Example 2 are shown. Astigmatism represents the meridional image plane curvature and the sagittal image plane curvature; distortion represents the distortion magnitude corresponding to different image heights.

[0110] Figure 6 The MTF curve of the optical imaging lens of Example 2 is shown, which represents the MTF values ​​in the meridional and sagittal directions of different fields of view at different spatial frequencies.

[0111] The optical imaging lens given in Example 2 can achieve good imaging quality.

[0112] Example 3

[0113] The following is for reference Figures 7 to 9 Describes an optical imaging lens according to Embodiment 3 of this application. Figure 7 A schematic diagram of the structure of an optical imaging lens according to Embodiment 3 of this application is shown.

[0114] like Figure 7 As shown, the optical imaging lens according to an exemplary embodiment of this application includes, in sequence 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 aperture stop STO, a fifth lens E5, a sixth lens E6, a seventh lens E7, an infrared filter E8, and an imaging surface S16.

[0115] 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 convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being concave and its image-side surface S6 being convex. 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 positive optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being convex. The seventh lens E7 has negative optical power, with its object-side surface S12 being concave and its image-side surface S13 being convex. The filter E8 has an object-side surface S14 and an image-side surface S15. Light from the object passes sequentially through surfaces S1 to S15 and is finally imaged onto the imaging surface S16.

[0116] Table 5 shows the surface type, radius of curvature, thickness, and material of each lens in the optical imaging lens of Example 3, wherein the units for radius of curvature and thickness are millimeters (mm).

[0117] Table 5

[0118]

[0119] In Table 5, the object-side and image-side surfaces of any one of the fifth lens E5 are aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formulas:

[0120]

[0121] Where x is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the vertex of the aspherical surface, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th higher-order term in the aspherical surface shape formula. Table 6 gives the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 for each aspherical surface that can be used in the third embodiment.

[0122] Table 6

[0123]

[0124] Figure 8 The astigmatism and distortion curves of the optical imaging lens of Example 3 are shown. Astigmatism represents the meridional image plane curvature and the sagittal image plane curvature; distortion represents the distortion magnitude corresponding to different image heights.

[0125] Figure 9 The MTF curve of the optical imaging lens of Example 3 is shown, which represents the MTF values ​​in the meridional and sagittal directions of different fields of view at different spatial frequencies.

[0126] The optical imaging lens given in Example 3 can achieve good imaging quality.

[0127] In Examples 1-3, the basic data is as follows:

[0128] Table 7

[0129]

[0130] In Examples 1-3, each conditional expression satisfies the conditions in the table below:

[0131] Table 8

[0132]

[0133] A camera module includes at least an optical lens, in which the aforementioned vehicle-mounted optical system is installed. It has the advantages of high pixel count and ultra-wide angle, compact structure, and is easy to manufacture and install. At the same time, it has high pixel count and stable imaging quality under high and low temperatures.

[0134] The above description provides one or more embodiments in conjunction with specific content, and does not imply that the specific implementation of the present invention is limited to these descriptions. Any methods or structures that are similar to or identical to those of the present invention, or any technical deductions or substitutions made based on the concept of the present invention, should be considered within the scope of protection of the present invention.

Claims

1. A vehicle-mounted high-definition surround-view optical imaging system, comprising, along the optical axis from the object plane to the image plane, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens, characterized in that: The first lens has negative optical power, its object side is convex, and its image side is concave. The second lens has negative optical power and its image-side surface is concave. The third lens has positive optical power, its object side is concave, and its image side is convex. The fourth lens has positive optical power and its object side is convex. The fifth lens has positive optical power, its object side is concave, and its image side is convex. The sixth lens has positive optical power, and its object side is convex, and its image side is convex. The seventh lens has negative optical power, its object side is concave, and its image side is convex. The optical imaging system satisfies the following relationship: 12 < TTL / f < 14; -5 < f1 / f < -3.5; Where TTL is the distance from the object-side surface of the first lens of the optical imaging system to the image plane, f is the effective focal length of the optical imaging system, and f1 is the effective focal length of the first lens.

2. The vehicle-mounted high-definition surround-view optical imaging system according to claim 1, characterized in that: The optical imaging system satisfies the following relationship: -4 < f2 / f < -3; 8 < f3 / f < 11; 6 < f4 / f < 8.5; 4 < f5 / f < 5; 2 < f6 / f < 3; -3 < f7 / f < -2; Where f is the effective focal length of the optical imaging system, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens.

3. The vehicle-mounted high-definition surround-view optical imaging system according to claim 1, characterized in that: The optical imaging system satisfies the following relationship: TTL / EPD < 27; Where TTL is the distance from the object-side surface of the first lens of the optical imaging system to the image plane, and EPD is the entrance pupil diameter of the optical imaging system.

4. The vehicle-mounted high-definition surround-view optical imaging system according to any one of claims 1-3, characterized in that: The optical imaging system satisfies the following relationship: 2.5 < | R11 / R12 | < 3.2; 2.0 < | R31 / R32 | < 5.0; 0 < |R41 / R42| < 1.0; 2.0 < | R51 / R52 | < 4.0; 0 < |R61 / R62| < 2.0; 0 < | R71 / R72 | < 1.0; Wherein, R11 is the object-side radius of curvature of the first lens, R12 is the image-side radius of curvature of the first lens; R31 is the object-side radius of curvature of the third lens, R32 is the image-side radius of curvature of the third lens; R41 is the object-side radius of curvature of the fourth lens, R42 is the image-side radius of curvature of the fourth lens; R51 is the object-side radius of curvature of the fifth lens, R52 is the image-side radius of curvature of the fifth lens; R61 is the object-side radius of curvature of the sixth lens, R62 is the image-side radius of curvature of the sixth lens; R71 is the object-side radius of curvature of the seventh lens, R72 is the image-side radius of curvature of the seventh lens.

5. The vehicle-mounted high-definition surround-view optical imaging system according to any one of claims 1-3, characterized in that: The optical imaging system satisfies the following relationship: 1.7 < nd1 < 2.05; 1.5 < nd2 < 1.7; 1.6 < nd3 < 2.0; 1.5 < nd4 < 1.8; 1.5 < nd5 < 1.65; 1.5 < nd6 < 1.65; 1.7 < nd7 < 2.0; Wherein, nd1 is the refractive index of the first lens; nd2 is the refractive index of the second lens; nd3 is the refractive index of the third lens; nd4 is the refractive index of the fourth lens; nd5 is the refractive index of the fifth lens; nd6 is the refractive index of the sixth lens; and nd7 is the refractive index of the seventh lens.

6. The vehicle-mounted high-definition surround-view optical imaging system according to any one of claims 1-3, characterized in that: The optical imaging system satisfies the following relationship: 20 < vd1 < 60; 30 < vd2 < 70; 20 < vd3 < 70; 20 < vd4 < 70; 35 < vd5 < 70; 35 < vd6 < 70; 20 < vd7 < 60; Wherein, vd1 is the Abbe number of the first lens, vd2 is the Abbe number of the second lens, vd3 is the Abbe number of the third lens, vd4 is the Abbe number of the fourth lens, vd5 is the Abbe number of the fifth lens, vd6 is the Abbe number of the sixth lens, and vd7 is the Abbe number of the seventh lens.

7. The vehicle-mounted high-definition surround-view optical imaging system according to any one of claims 1-3, characterized in that: The optical imaging system satisfies the following relationship: (dn / dt)6<-6.0(10 -06 / ℃); Where (dn / dt)6 is the coefficient of refractive index of the sixth lens as a function of temperature.

8. The vehicle-mounted high-definition surround-view optical imaging system according to any one of claims 1-3, characterized in that: The optical imaging system satisfies the following relationship: TTL / IH < 10; Where TTL is the distance from the object-side surface of the first lens of the optical imaging system to the image plane, and IH is half the diameter of the largest image circle on the image plane.

9. The vehicle-mounted high-definition surround-view optical imaging system according to any one of claims 1-3, characterized in that: The optical imaging system satisfies the following relationship: |f123 / f567|≤1; Where f123 is the combined focal length of the first, second, and third lenses, and f567 is the combined focal length of the fifth, sixth, and seventh lenses.

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

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