Low-distortion vehicle-mounted optical imaging system and camera module using same

Abstract

The application provides a low-distortion vehicle-mounted optical imaging system and an applied camera module, which are mainly composed of seven lenses, the first lens has optical power, the second lens has optical power, the object side of the second lens is a convex surface, the third lens has negative optical power, the object side of the third lens is a concave surface, the image side of the third lens is a concave surface, the fourth lens has positive optical power, the object side of the fourth lens is a convex surface, the image side of the fourth lens is a convex surface, the fifth lens has positive optical power, the object side of the fifth lens is a convex surface, the sixth lens has optical power, and the seventh lens has negative optical power. Through reasonable matching of the shapes and optical powers of the lenses, the design has the advantages of low distortion, high pixels and high resolution, the temperature characteristic is excellent, the recognition ability of the optical system to objects is further improved, and the design requirements of the optical system for low distortion and high resolution are effectively met.

Description

TECHNICAL FIELD

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

[0002] With the continuous development of technology, the automobile industry has ushered in an era of intelligence. Intelligent driving assistance systems, as an important part of automobile intelligence, play an important role in improving driving safety, reducing accident rates and improving user experience. In order to meet the various needs in the driving process, it is necessary to improve the performance of the vehicle-mounted optical imaging system, which is characterized by low distortion, high resolution, and temperature insensitivity. However, the existing vehicle-mounted optical lens cannot meet the above requirements. SUMMARY

[0003] The present application aims to provide a low-distortion vehicle-mounted optical imaging system with the advantages of low distortion, high resolution, and excellent temperature characteristics, further improving the object recognition ability of the optical imaging system.

[0004] A low-distortion vehicle-mounted optical imaging system, sequentially comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens along the optical axis from the object plane to the image plane;

[0005] The first lens has optical power;

[0006] The second lens has optical power, and its object side is convex;

[0007] The third lens has negative optical power, and its object side is concave and its image side is concave;

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

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

[0010] The sixth lens has optical power;

[0011] The seventh lens has negative optical power.

[0012] Preferably, the optical imaging system satisfies the following relationship: 0<|f1+f2| / |f1-f2|<1.2;

[0013] Wherein, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens.

[0014] Preferably, the optical imaging system satisfies the following relationship: -2.0<f3 / f4<0;

[0015] Wherein, f3 is the effective focal length of the third lens, and f4 is the effective focal length of the fourth lens.

[0016] Preferably, the optical imaging system satisfies the following relationship: -5.0 < f7 / f < 0;

[0017] Wherein, f7 is the effective focal length of the seventh lens, and f is the effective focal length of the optical imaging system.

[0018] Preferably, the optical imaging system satisfies the following relationship: -10.0 < (f-f12) / f < 0; wherein, f is the effective focal length of the optical imaging system, and f12 is the effective focal length of the combination of the first lens and the second lens.

[0019] Preferably, the optical imaging system satisfies the following relationship: 0.6 < f*tan(DFOV) / DT11 < 1.2;

[0020] Wherein, f is the effective focal length of the optical imaging system, DFOV is half of the maximum field of view angle of the optical imaging system, and DT11 is the maximum effective radius of the object side surface of the first lens.

[0021] Preferably, the optical imaging system satisfies the following relationship: 1.2 < f / EPD < 2.2;

[0022] Wherein, f is the effective focal length of the optical imaging system, and EPD is the entrance pupil diameter of the optical imaging lens.

[0023] Preferably, the optical imaging system satisfies the following relationship: 1.8 < f / TTL*ImagH < 3.6;

[0024] Wherein, f is the effective focal length of the optical imaging system, TTL is the axial distance from the object side surface of the first lens to the imaging surface, and ImagH is half of the diagonal length of the effective pixel area on the imaging surface.

[0025] Preferably, the optical imaging system satisfies the following relationship:

[0026] Nd1 < 1.93, Vd1 > 34;

[0027] Nd2 < 1.9, Vd2 > 30;

[0028] Nd3 > 1.57, Vd3 < 50;

[0029] Nd4 > 1.49, Vd4 > 60;

[0030] Nd5 > 1.47, Vd5 > 60;

[0031] Nd6 < 1.85, Vd6 > 44;

[0032] Nd7<1.84, Vd7>20;

[0033] wherein, Nd1 is the refractive index of the first lens, Vd1 is the Abbe number of the first lens; Nd2 is the refractive index of the second lens, Vd2 is the Abbe number of the second lens; Nd3 is the refractive index of the third lens, Vd3 is the Abbe number of the third lens; Nd4 is the refractive index of the fourth lens, Vd4 is the Abbe number of the fourth lens; Nd5 is the refractive index of the fifth lens, Vd5 is the Abbe number of the fifth lens, Nd6 is the refractive index of the sixth lens, Vd6 is the Abbe number of the sixth lens, Nd7 is the refractive index of the seventh lens, Vd7 is the Abbe number of the seventh lens.

[0034] Preferably, the optical imaging system satisfies the following relationship: 0.7<(R1+R2) / R2<2.0;

[0035] wherein, R1 is the radius of curvature of the object side surface of the first lens, R2 is the radius of curvature of the image side surface of the first lens.

[0036] Preferably, the optical imaging system satisfies the following relationship: -3.8<(R5-R6) / R7<-1.5;

[0037] wherein, R5 is the radius of curvature of the object side surface of the third lens, R6 is the radius of curvature of the image side surface of the third lens, R7 is the radius of curvature of the object side surface of the fourth lens.

[0038] 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 low-distortion vehicle-mounted optical imaging system.

[0039] Compared with the prior art, the beneficial effects of the present application are as follows:

[0040] The present application provides a low-distortion vehicle-mounted optical imaging system and a camera module using the same, which is mainly composed of seven lenses. The first lens has optical power, the second lens has optical power, the object side surface of which is a convex surface, the third lens has negative optical power, the object side surface of which is a concave surface, and the image side surface of which is a concave surface, the fourth lens has positive optical power, the object side surface of which is a convex surface, and the image side surface of which is a convex surface, the fifth lens has positive optical power, the object side surface of which is a convex surface, the sixth lens has optical power, and the seventh lens has negative optical power. Through reasonable matching of the shapes and optical powers of the lenses, the design has the advantages of low distortion, high pixel, and high resolution, and the temperature characteristics are excellent, which further improves the recognition ability of the optical system to objects and effectively meets the design requirements of low distortion and high resolution of the optical system. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows.

[0042] Figure 1 is a structural schematic diagram of an optical imaging system or camera module of Embodiment 1 of the present application;

[0043] Figure 2 is a field curvature curve and distortion curve of the optical imaging system or camera module of Embodiment 1 of the present application;

[0044] Figure 3 is a structural schematic diagram of an optical imaging system or camera module of Embodiment 2 of the present application;

[0045] Figure 4 is a field curvature curve and distortion curve of the optical imaging system or camera module of Embodiment 2 of the present application;

[0046] Figure 5 is a structural schematic diagram of an optical imaging system or camera module of Embodiment 3 of the present application;

[0047] Figure 6 is a field curvature curve and distortion curve of the optical imaging system or camera module of Embodiment 3 of the present application. DETAILED DESCRIPTION

[0048] As shown in Figures 1-6 , the present application provides a low-distortion vehicle-mounted optical imaging system, which is sequentially composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens along an optical axis from an object plane to an image plane;

[0049] The first lens has optical power;

[0050] The second lens has optical power, and its object-side surface is convex;

[0051] The third lens has negative optical power, and its object-side surface is concave and its image-side surface is concave;

[0052] The fourth lens has positive optical power, and its object-side surface is convex and its image-side surface is convex;

[0053] The fifth lens has positive optical power, and its object-side surface is convex;

[0054] The sixth lens has optical power;

[0055] The seventh lens has negative optical power.

[0056] The optical imaging system of the embodiment of the present application is mainly composed of seven lenses, and has the advantages of low distortion, high pixel and high resolution design by reasonable matching of lens shape and optical power, and excellent temperature characteristics, further improving the recognition ability of the optical system to objects, effectively meeting the design requirements of low distortion and high resolution of the optical system.

[0057] Further, the optical imaging system satisfies the following relationship: 0.6 < f*tan(DFOV) / DT11 < 1.2; wherein, f is an effective focal length of the optical imaging system, DFOV is half of a maximum field of view angle of the optical imaging system, and DT11 is a maximum effective radius of a material side of the first lens. By reasonably allocating the effective focal length of the optical imaging system, half of the maximum field of view angle of the optical imaging system, and the maximum effective radius of the material side of the first lens, the size of the system can be effectively compressed.

[0058] Further, the optical imaging system satisfies the following relationship: 1.2 < f / EPD < 2.2; 1.8 < f / TTL*ImagH < 3.6; 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 axial distance from a material side of the first lens to an imaging surface, and ImagH is half of a diagonal length of an effective pixel area on the imaging surface. By reasonably allocating the ratio of the effective focal length of the optical imaging lens, the axial distance from the material side of the first lens to the imaging surface, and half of the diagonal length of the effective pixel area on the imaging surface, the light deflection angle is small, the sensitivity of the optical imaging lens can be effectively reduced, the optical imaging lens can be thinned, high pixels can be achieved, and the optical imaging lens is easy to injection mold and has a high assembly yield.

[0059] Further, the optical imaging system satisfies the following relationship: Nd1 < 1.93, Vd1 > 34; Nd2 < 1.9, Vd2 > 30; Nd3 > 1.57, Vd3 < 50; Nd4 > 1.49, Vd4 > 60; Nd5 > 1.47, Vd5 > 60; Nd6 < 1.85, Vd6 > 44; Nd7 < 1.84, Vd7 > 20; wherein, Nd1 is a refractive index of the first lens, Vd1 is an Abbe number of the first lens; Nd2 is a refractive index of the second lens, Vd2 is an Abbe number of the second lens; Nd3 is a refractive index of the third lens, Vd3 is an Abbe number of the third lens; Nd4 is a refractive index of the fourth lens, Vd4 is an Abbe number of the fourth lens; Nd5 is a refractive index of the fifth lens, Vd5 is an Abbe number of the fifth lens, Nd6 is a refractive index of the sixth lens, Vd6 is an Abbe number of the sixth lens, Nd7 is a refractive index of the seventh lens, and Vd7 is an Abbe number of the seventh lens. This design can effectively reduce chromatic aberration, optimize lens aberration, and effectively improve the imaging quality of the system.

[0060] Further, the optical imaging system satisfies the following relationship: 0 < |f1+f2| / |f1-f2| < 1.2; wherein, f1 is an effective focal length of the first lens, and f2 is an effective focal length of the second lens. By reasonably controlling the focal length ratio of the first lens and the second lens, the optical system can obtain a higher imaging resolution.

[0061] Further, the optical imaging system satisfies the following relationship: -2.0 < f3 / f4 < 0; wherein f3 is an effective focal length of the third lens, and f4 is an effective focal length of the fourth lens. By limiting the effective focal length ratio of the third lens and the fourth lens, the astigmatism of the system can be effectively corrected, thereby ensuring the image quality of the edge field of view.

[0062] Further, the optical imaging system satisfies the following relationship: 0.7 < (R1+R2) / R2 < 2.0; wherein R1 is a curvature radius of the object side surface of the first lens, and R2 is a curvature radius of the image side surface of the first lens. By controlling the curvature radius of the object side surface and the image side surface of the first lens, the total deflection angle of the object side surface and the image side surface of the first lens at the edge field of view can be reasonably controlled within a reasonable range, thereby effectively reducing the sensitivity of the system.

[0063] Further, the optical imaging system satisfies the following relationship: -3.8 < (R5-R6) / R7 < -1.5; wherein R5 is a curvature radius of the object side surface of the third lens, R6 is a curvature radius of the image side surface of the third lens, and R7 is a curvature radius of the object side surface of the fourth lens. By reasonably controlling the ratio of the curvature radius of the object side surface of the third lens and the fourth lens, the astigmatism contribution of the image side surface of the fourth lens is within a reasonable range, thereby balancing the accumulated astigmatism of the front system, so that the optical system has good imaging quality in both the meridional plane and the sagittal plane.

[0064] Further, the optical imaging system satisfies the following relationship: -5.0 < f7 / f < 0; wherein f7 is an effective focal length of the seventh lens, and f is an effective focal length of the optical system. By reasonably limiting the ratio of the optical power of the seventh lens to the effective focal length of the optical imaging system, the remaining spherical aberration can be balanced to balance the spherical aberration generated by the first six lenses, thereby fine-tuning and controlling the spherical aberration of the system and strengthening the accurate control of the on-axis field aberration.

[0065] Further, the optical imaging system satisfies the following relationship: -10.0 < (f-f12) / f < 0; wherein f12 is an effective combined focal length of the first lens and the second lens, and f is an effective focal length of the optical system. By reasonably limiting the relationship between the effective combined focal length of the first lens and the second lens and the effective focal length of the optical system, the imaging resolution of the system is improved. If the upper limit of the relationship is exceeded, the refractive power of the lens combination is too small, which is easy to produce larger edge aberration and chromatic aberration, which is not conducive to improving the resolution performance; if the lower limit of the relationship is exceeded, the overall refractive power of the first lens and the second lens is too strong, which makes the lens combination easy to produce serious astigmatism, which is not conducive to improving the imaging quality.

[0066] Embodiment one,

[0067] The following refers to Figures 1 to 2An optical imaging lens according to Embodiment 1 of the present application is described. Figure 1 A structural diagram of an optical imaging lens according to Embodiment 1 of the present application is shown.

[0068] As shown in Figure 1 , the optical imaging lens according to the exemplary embodiment of the present application comprises, in order from the object side to the image side along the optical axis, a first lens E1, a second lens E2, an STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17.

[0069] The first lens E1 has a negative focal power, the object side surface S1 is concave, and the image side surface S2 is convex. The second lens E2 has a positive focal power, the object side surface S3 is convex, and the image side surface S4 is concave. The third lens E3 has a negative focal power, the object side surface S6 is concave, and the image side surface S7 is concave. The fourth lens E4 has a positive focal power, the object side surface S7 is convex, and the image side surface S8 is convex. The fifth lens E5 has a positive focal power, the object side surface S9 is convex, and the image side surface S10 is a plane. The sixth lens E6 has a positive focal power, the object side surface S11 is convex, and the image side surface S12 is convex. The seventh lens E7 has a negative focal power, the object side surface S13 is concave, and the image side surface S14 is convex. The filter E8 has an object side surface S15 and an image side surface S16. Light from an object passes through each surface S1 to S16 in order and is finally imaged on the imaging surface S17.

[0070] Table 1 shows the surface type, the radius of curvature, the thickness, and the material of each lens of the optical imaging lens of Embodiment 1, wherein the units of the radius of curvature and the thickness are millimeters (mm).

[0071] Table 1

[0072]

[0073] In Table 1, the object side surface and the image side surface of each of the second lens E2 and the sixth lens E6 are aspherical surfaces, and the surface type of each aspherical surface can be defined by, but is not limited to, the following aspherical surface formula:

[0074]

[0075] wherein x is the distance from a corresponding point on the aspherical surface to a 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 high-order term in the aspherical surface formula. Table 2 shows the conic coefficient and the high-order term coefficients A4, A6, A8, A10, A12, A14, and A16 of each aspherical surface that can be used in the first embodiment.

[0076] Table 2

[0077]

[0078] Embodiment Two,

[0079] The optical imaging lens according to Embodiment 2 of the present application is described below with reference to the following Figures 3 to 4 The optical imaging lens according to Embodiment 2 of the present application is described below with reference to the following Figure 3 The structure of the optical imaging lens according to Embodiment 2 of the present application is shown in the following table.

[0080] As shown in the following table, the optical imaging lens according to the exemplary embodiments of the present application comprises, in order from the object side to the image side along the optical axis, a first lens E1, a second lens E2, an STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, and an imaging surface S17. Figure 3 The first lens E1 has positive refractive power, the object side surface S1 is convex, and the image side surface S2 is concave. The second lens E2 has negative refractive power, the object side surface S3 is convex, and the image side surface S4 is concave. The third lens E3 has negative refractive power, the object side surface S6 is concave, and the image side surface S7 is concave. The fourth lens E4 has positive refractive power, the object side surface S7 is convex, and the image side surface S8 is convex. The fifth lens E5 has positive refractive power, the object side surface S9 is convex, and the image side surface S10 is convex. The sixth lens E6 has positive refractive power, the object side surface S11 is convex, and the image side surface S12 is convex. The seventh lens E7 has negative refractive power, the object side surface S13 is concave, and the image side surface S14 is convex. The filter E8 has an object side surface S15 and an image side surface S16. Light from an object passes through the surfaces S1 to S16 in order and is finally imaged on the imaging surface S17.

[0081] The surface types, the radii of curvature, the thicknesses, and the materials of the lenses of the optical imaging lens according to Embodiment 2 are shown in the following table, wherein the units of the radii of curvature and the thicknesses are millimeters (mm).

[0082] The surface types, the radii of curvature, the thicknesses, and the materials of the lenses of the optical imaging lens according to Embodiment 2 are shown in the following table, wherein the units of the radii of curvature and the thicknesses are millimeters (mm).

[0083] The surface types, the radii of curvature, the thicknesses, and the materials of the lenses of the optical imaging lens according to Embodiment 2 are shown in the following table, wherein the units of the radii of curvature and the thicknesses are millimeters (mm).

[0084] The surface types, the radii of curvature, the thicknesses, and the materials of the lenses of the optical imaging lens according to Embodiment 2 are shown in the following table, wherein the units of the radii of curvature and the thicknesses are millimeters (mm).

[0085] In Table 3, the object side surface and the image side surface of the second lens E2 are both aspherical surfaces. The aspherical surface can be defined by, but is not limited to, the following aspherical equation:

[0086]

[0087] wherein 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 high order term in the aspherical surface formula. Table 4 shows the conic coefficients and high order term coefficients A4, A6, A8, A10, A12, A14 and A16 of the aspherical surfaces that can be used in the second embodiment.

[0088] Table 4

[0089]

[0090] Embodiment Three,

[0091] The optical imaging lens according to Embodiment 3 of the present application is described below with reference to Figures 5 to 6 The optical imaging lens according to Embodiment 3 of the present application is described below with reference to Figure 5 The structure of the optical imaging lens according to Embodiment 3 of the present application is shown in FIG. 3.

[0092] As shown in FIG. 3, the optical imaging lens according to an exemplary embodiment of the present application comprises, in order from the object side to the image side along the optical axis, a first lens E1, a second lens E2, an STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8, a chip protection glass sheet E9, and an imaging surface S21. Figure 5 The first lens E1 has a negative focal power, with the object side surface S1 being concave and the image side surface S2 being convex. The second lens E2 has a positive focal power, with the object side surface S3 being convex and the image side surface S4 being concave. The third lens E3 has a negative focal power, with the object side surface S6 being concave and the image side surface S7 being concave. The fourth lens E4 has a positive focal power, with the object side surface S7 being convex and the image side surface S8 being convex. The fifth lens E5 has a positive focal power, with the object side surface S9 being convex and the image side surface S10 being a plane. The sixth lens E6 has a positive focal power, with the object side surface S11 being convex and the image side surface S12 being convex. The seventh lens E7 has a negative focal power, with the object side surface S13 being concave and the 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 through the surfaces S1 to S16 in order and is finally imaged on the imaging surface S17.

[0093] Table 5 shows the surface type, the radius of curvature, the thickness and the material of each lens of the optical imaging lens of Embodiment 3, wherein the units of the radius of curvature and the thickness are millimeters (mm).

[0094] Table 5

[0095]

[0096]

[0097] ​In Table 5, the second lens E2 and the sixth lens E6 are both aspherical on the object side and the image side, and the surface shape of each aspherical lens can be defined by, but is not limited to, the following aspherical surface formula:

[0098]

[0099] wherein 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 high-order term in the aspherical surface formula. Table 6 shows the conic coefficients and high-order term coefficients A4, A6, A8, A10, A12, A14 and A16 of the aspherical surfaces that can be used in the first embodiment.

[0100] Table 6

[0101]

[0102] In the embodiments 1-3, each condition satisfies the conditions in the following table:

[0103] Table 7

[0104]

[0105] A camera module at least includes an optical lens, and the optical lens is installed with the low-distortion vehicle-mounted optical imaging system described above. The design has the advantages of low distortion, high pixels and high resolution. The temperature characteristics are excellent, and the recognition ability of the optical system to objects is further improved, effectively meeting the design requirements of low distortion and high resolution of the optical system.

[0106] The above description 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 under the premise of the concept of the present application, should be considered as the protection scope of the present application.

Claims

1. A low-distortion vehicle-mounted optical imaging system, comprising, sequentially from the object plane to the image plane along the optical axis, 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, and its object side is concave while its image side is convex. The second lens has positive optical power, with its object side being convex and its image side being concave. The third lens has negative optical power, and its object side is concave, as is its image side; The fourth lens has positive optical power, and its object side is convex, as is its image side; The fifth lens has positive optical power and its object 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, and its object side is concave while its image side is convex. The optical imaging system satisfies the following relationship: 0.68 ≤ |f1+f2| / |f1-f2| < 1.2; 1.9 ≤ (R1+R2) / R2 < 2.0; 0.6 < f*tan(DFOV) / DT11≤0.9; Where f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f is the effective focal length of the optical imaging system, R1 is the radius of curvature of the object side of the first lens, R2 is the radius of curvature of the image side of the first lens, DFOV is half of the maximum field of view of the optical imaging system, and DT11 is the maximum effective radius of the object side of the first lens.

2. The low-distortion vehicle-mounted optical imaging system according to claim 1, characterized in that: The optical imaging system satisfies the following relationship: -2.0 < f3 / f4 < 0; Where f3 is the effective focal length of the third lens and f4 is the effective focal length of the fourth lens.

3. The low-distortion vehicle-mounted optical imaging system according to claim 1, characterized in that: The optical imaging system satisfies the following relationship: -5.0 < f7 / f < 0; Where f7 is the effective focal length of the seventh lens, and f is the effective focal length of the optical imaging system.

4. The low-distortion vehicle-mounted optical imaging system according to claim 1, characterized in that: The optical imaging system satisfies the following relationship: -10.0 < (f-f12) / f < 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.

5. The low-distortion vehicle-mounted optical imaging system according to any one of claims 1-4, characterized in that: The optical imaging system satisfies the following relationship: 1.2 < f / EPD < 2.2; 1.8 mm < f / TTL*ImagH < 3.6 mm; 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 on-axis distance from the object side of the first lens to the imaging surface, and ImagH is half the diagonal length of the effective pixel area on the imaging surface.

6. The low-distortion vehicle-mounted optical imaging system according to any one of claims 1-4, characterized in that: The optical imaging system satisfies the following relationship: Nd1 < 1.93, Vd1 > 34; Nd2 < 1.9, Vd2 > 30; Nd3>1.57, Vd3<50; Nd4>1.49, Vd4>60; Nd5>1.47, Vd5>60; Nd6 < 1.85, Vd6 > 44; Nd7 < 1.84, Vd7 > 20; Wherein, Nd1 is the refractive index of the first lens, and Vd1 is the Abbe number of the first lens; Nd2 is the refractive index of the second lens, and Vd2 is the Abbe number of the second lens; Nd3 is the refractive index of the third lens, and Vd3 is the Abbe number of the third lens; Nd4 is the refractive index of the fourth lens, and Vd4 is the Abbe number of the fourth lens; Nd5 is the refractive index of the fifth lens, and Vd5 is the Abbe number of the fifth lens; Nd6 is the refractive index of the sixth lens, and Vd6 is the Abbe number of the sixth lens; Nd7 is the refractive index of the seventh lens, and Vd7 is the Abbe number of the seventh lens.

7. The low-distortion vehicle-mounted optical imaging system according to any one of claims 1-4, characterized in that: The optical imaging system satisfies the following relationship: -3.8 < (R5-R6) / R7 < -1.5; Wherein, R5 is the radius of curvature of the object side of the third lens, R6 is the radius of curvature of the image side of the third lens, and R7 is the radius of curvature of the object side of the fourth lens.

8. A camera module, comprising at least an optical lens, characterized in that: The optical lens is equipped with the low-distortion vehicle-mounted optical imaging system according to any one of claims 1-7.

Images