A high-pixel, large-aperture vehicle-mounted optical imaging system and its application camera module

Abstract

This invention provides a high-pixel, large-aperture automotive optical imaging system and its camera module, which mainly consists of 7 lenses. Through the reasonable combination of lens shape and optical power, it effectively meets the high-pixel design requirements of the optical system and effectively reduces component sensitivity. It has the advantages of high pixel count, wide angle and small overall length. The structure is compact, easy to process and install, and the large aperture configuration can increase the amount of light entering the optical system and achieve higher imaging quality.

Description

Technical Field

[0001] This application relates to the field of optical imaging, and in particular to a high-pixel, large-aperture automotive optical imaging system and its application camera module. Background Technology

[0002] With the advancement of science and the development of artificial intelligence, the demand for optical imaging systems in the automotive field is growing rapidly. Since intelligent driver assistance systems (ADAS) are closely related to vehicle driving safety, and ADAS lenses are crucial tools for driver safety, designing and manufacturing high-performance, image-quality-stable ADAS lenses is of paramount importance. ADAS lenses are currently widely used. However, existing ADAS lenses on the market suffer from low pixel counts, high costs, and large structural sizes, which are no longer sufficient to meet current needs. Therefore, high-quality, low-cost ADAS lenses have a wide range of applications and significant field-of-view requirements. Furthermore, ADAS optical imaging systems that are thermally inert, have stable image quality, and are free of ghosting have become the ultimate goal. Summary of the Invention

[0003] To achieve the goals of high resolution, miniaturization, and wide-angle imaging, the imaging system provided in this application has the advantages of high resolution, wide-angle imaging, and small overall length. At the same time, the large aperture configuration can increase the amount of light entering the optical system and achieve higher imaging quality.

[0004] A high-pixel, large-aperture vehicle-mounted optical imaging system comprises, 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 object side is concave, as is its image side;

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

[0013] 0.9 <f*tan(HFOV) / DT1<1.1;

[0014] 1.1 <f*tan(HFOV) / DT2<1.6;

[0015] 1.1 <f*tan(HFOV) / DT3<1.6;

[0016] 1.1 <f*tan(HFOV) / DT4<1.5;

[0017] 1.3 <f*tan(HFOV) / DT5<1.6;

[0018] 1.1 <f*tan(HFOV) / DT6<1.6;

[0019] 1.1 <f*tan(HFOV) / DT7<1.5;

[0020] Where f is the effective focal length of the optical imaging system, HFOV is half of the maximum field of view of the optical imaging system, DT1 is the maximum effective radius of the first lens, DT2 is the maximum effective radius of the second lens, DT3 is the maximum effective radius of the third lens, DT4 is the maximum effective radius of the fourth lens, DT5 is the maximum effective radius of the fifth lens, DT6 is the maximum effective radius of the sixth lens, and DT7 is the maximum effective radius of the seventh lens.

[0021] Preferably, the optical imaging system satisfies the following relationship: -4 <fi(i=1,2,3,4,5,6) / f<4;

[0022] Where fi (i=1,2,3,4,5,6) are the effective focal lengths of the first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens, respectively, and f is the effective focal length of the optical imaging system.

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

[0024] 1.7 <R11 / R12<2.9;

[0025] -1.4 <R21 / R22<-0.2;

[0026] -2.0 <R31 / R32<-0.5;

[0027] -0.4 <R41 / R42<0.4;

[0028] 1 < |R51 / R52| < 4.5;

[0029] 1.1 <R71 / R72<9.6;

[0030] 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; R21 is the curvature radius of the object side surface of the second lens, R22 is the curvature radius of the image side surface of the second 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; 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.

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

[0032] 0 < |f4 / f7| < 1;

[0033] 0 < |f1 / f23| < 1;

[0034] 0.4 < |f1 / f56| < 1.2;

[0035] Where, f1 is the effective focal length of the first lens, f4 is the effective focal length of the fourth lens, f7 is the effective focal length of the seventh lens, f23 is the effective combined focal length of the second lens and the third lens, f56 is the effective combined focal length of the fifth lens and the sixth lens.

[0036] Preferably, the optical imaging system satisfies the following relationships:

[0037] 15 < vd4 / nd4 < 55;

[0038] 10 < vd7 / nd7 < 55;

[0039] 1.49 < nd5 < 1.85;

[0040] 1.49 < nd6 < 1.85;

[0041] Where, nd4 is the refractive index of the fourth lens, vd4 is the Abbe number of the fourth lens; nd7 is the refractive index of the seventh lens, vd7 is the Abbe number of the seventh lens, nd5 is the refractive index of the fifth lens, nd6 is the refractive index of the sixth lens.

[0042] Preferably, the optical imaging system satisfies the following relationships: 0.5 < f / BFL < 3.0; and / or

[0043] 0.2 < CT1 / ET1 < 1.5;

[0044] Where, f is the effective focal length of the optical imaging system, BFL is the distance on the optical axis from the image side surface of the seventh lens to the imaging surface, CT1 is the central thickness of the first lens, ET1 is the edge thickness of the first lens.

[0045] Preferably, the optical imaging system satisfies the following relationship: 0.1 mm / ° < TTL / DFOV < 1.0 mm / °, where DFOV is the field of view of the optical imaging system and TTL is the distance from the object-side surface of the first lens of the optical imaging system to the imaging surface.

[0046] Preferably, the first lens, the second lens, the third lens, the fifth lens, and the sixth lens are spherical lenses, and the fourth lens and the seventh lens are aspherical lenses.

[0047] On the other hand, this application embodiment also provides a camera module, which includes at least an optical lens, and the aforementioned high-pixel large-aperture vehicle optical imaging system is installed in the optical lens.

[0048] Compared with the prior art, the beneficial effects of this application are as follows:

[0049] This invention provides a high-pixel, large-aperture automotive optical imaging system and its camera module, which mainly consists of 7 lenses. Through the reasonable combination of lens shape and optical power, it effectively meets the high-pixel design requirements of the optical system and effectively reduces component sensitivity. It has the advantages of high pixel count, wide angle and small overall length. The structure is compact, easy to process and install, and the large aperture configuration can increase the amount of light entering the optical system and the higher imaging quality. Attached Figure Description

[0050] 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.

[0051] Figure 1 This is a schematic diagram of the structure of the optical system or camera module in Embodiment 1 of this application;

[0052] Figure 2 This refers to the astigmatism and distortion curves of the optical system or camera module in Embodiment 1 of this application;

[0053] Figure 3 This is the MTF curve of the optical system or camera module in Embodiment 1 of this application;

[0054] Figure 4 This is a schematic diagram of the structure of the optical system or camera module in Embodiment 2 of this application;

[0055] Figure 5 This refers to the astigmatism and distortion curves of the optical system or camera module in Embodiment 2 of this application;

[0056] Figure 6 This is the MTF curve of the optical system or camera module in Embodiment 2 of this application;

[0057] Figure 7This is a schematic diagram of the structure of the optical system or camera module in Embodiment 3 of this application;

[0058] Figure 8 This refers to the astigmatism and distortion curves of the optical system or camera module in Embodiment 3 of this application;

[0059] Figure 9 This is the MTF curve of the optical system or camera module in Embodiment 3 of this application. Detailed Implementation

[0060] like Figure 1-9 As shown, this application provides a high-pixel, large-aperture automotive optical imaging system, which includes, along the optical axis from the object plane to the image plane, 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. The first, second, third, fifth, and sixth lenses are spherical lenses, while the fourth and seventh lenses are aspherical lenses. The first lens has negative optical power, with a convex object-side surface and a concave image-side surface; the second lens has negative optical power, with a concave object-side surface and a concave image-side surface; the third lens has positive optical power, with a convex object-side surface and a convex image-side surface; the fourth lens has positive optical power, with a convex object-side surface; the fifth lens has optical power, with a convex object-side surface; the sixth lens has optical power; and the seventh lens has negative optical power.

[0061] The optical system of this application embodiment is mainly composed of 7 lenses. Through the reasonable combination of lens shape and optical power, it effectively meets the high pixel design requirements of the optical system and effectively reduces component sensitivity. It has the advantages of high pixel count, wide angle and small overall length. The structure is compact and easy to process and install. At the same time, the large aperture configuration can increase the amount of light entering the optical system and the higher imaging quality.

[0062] Furthermore, the optical imaging system satisfies the following condition: 0.1 mm / ° < TTL / DFOV < 1.0 mm / °, where DFOV is the field of view of the optical imaging system, and TTL is the distance from the object-side surface of the first lens to the imaging plane. By reasonably balancing the field of view of the optical imaging system, the imaging of the intelligent assisted driving optical system can be kept within a suitable range, effectively compressing the system size and achieving miniaturization of the high-pixel optical system.

[0063] Furthermore, the optical imaging system satisfies the following conditions: 0.9 < f * tan(HFOV) / DT1 < 1.1; 1.1 < f * tan(HFOV) / DT2 < 1.6; 1.1 < f * tan(HFOV) / DT3 < 1.6; 1.1 < f * tan(HFOV) / DT4 < 1.5; 1.3 < f * tan(HFOV) / DT5 < 1.6; 1.1 < f * tan(HFOV) / DT6 < 1.6; 1.1 < f * tan(HFOV) / DT7 < 1.5; where f is the effective focal length of the optical imaging system, HFOV is half of the maximum field of view angle of the optical imaging system, DT1 is the maximum effective radius of the first lens, DT2 is the maximum effective radius of the second lens, DT3 is the maximum effective radius of the third lens, DT4 is the maximum effective radius of the fourth lens, DT5 is the maximum effective radius of the fifth lens, DT6 is the maximum effective radius of the sixth lens, and DT7 is the maximum effective radius of the seventh lens. By controlling the relationship between the focal length, field of view angle, and aperture between each lens, the requirement of small distortion is achieved, while the effective diameters of each component are restricted, the size of the overall optical system is controlled, which is beneficial to correcting the coma of the system.

[0064] Furthermore, the optical imaging system satisfies the following conditions: -4 < fi (i = 1, 2, 3, 4, 5, 6) / f < 4; where fi (i = 1, 2, 3, 4, 5, 6) are the effective focal lengths of the first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens respectively, and f is the effective focal length of the optical imaging system. The limitation of the ratio of the effective focal lengths of each lens to the effective focal length of the optical system enables the optical system to obtain a reasonable light deflection angle, effectively reduces the sensitivity of component tolerances, and improves the system aberration.

[0065] Furthermore, the optical imaging system satisfies the following conditions: 1.7 < R11 / R12 < 2.9; -1.4 < R21 / R22 < -0.2; -2.0 < R31 / R32 < -0.5; -0.4 < R41 / R42 < 0.4; 1 < |R51 / R52| < 4.5; 1.1 < R71 / R72 < 9.6; 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; R21 is the curvature radius of the object side surface of the second lens, R22 is the curvature radius of the image side surface of the second 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; 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 of the curvature radii between each component, the ghost images formed by the reflections between the 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 chief ray incident angle of the optical system design, and effectively reducing the sensitivity of the system.

[0066] Furthermore, the optical imaging system satisfies the following conditions: 0 < |f4 / f7| < 1; 0 < |f1 / f23| < 1; 0.4 < |f1 / f56| < 1.2; where, f1 is the effective focal length of the first lens, f4 is the effective focal length of the fourth lens, f7 is the effective focal length of the seventh lens, f23 is the effective combined focal length of the second lens and the third lens, f56 is the effective combined focal length of the fifth lens and the sixth lens. By constraining the ratios of the effective focal lengths of the fourth lens and the seventh lens, the ratio of the combined focal length of the first lens and the second lens and the third lens, and the ratio of the combined focal length of the first lens and the fifth lens and the sixth lens within a reasonable range, both the excellent image quality of the optical system and the good processability of the system are ensured.

[0067] Furthermore, the optical imaging system satisfies the following conditions: 1.5 < f / BFL < 3.0; where, f is the effective focal length of the optical imaging system, and BFL is the distance on the optical axis from the image side surface of the seventh lens to the imaging plane. By controlling the relationship between the effective focal length of the optical imaging system and the distance on the optical axis from the image side surface of the seventh lens to the imaging plane, it is beneficial to the assembly of the optical imaging system, and at the same time, it is also beneficial to reducing the ghost images generated between the optical imaging system and the electronic components.

[0068] Furthermore, the optical imaging system satisfies the following conditions: 15 < vd4 / nd4 < 55, 10 < vd7 / nd7 < 55;; where, nd4 is the refractive index of the fourth lens, vd4 is the Abbe number of the fourth lens; nd7 is the refractive index of the seventh lens, vd7 is the Abbe number of the seventh lens. By defining the relationship between the refractive index and the Abbe number of the fourth lens and the seventh lens, it is beneficial to reduce aberration and improve the image quality of the high-pixel optical system.

[0069] Furthermore, the optical imaging system satisfies the following conditions: 0.2 < CT1 / ET1 < 1.5; where, CT1 is the central thickness of the first lens, ET1 is the edge thickness of the first lens. By defining the relationship between the central thickness and the edge thickness of the first lens, it not only meets the application requirements of the high-pixel optical imaging system in the in-vehicle and out-of-vehicle spaces, but also ensures good processability of the component.

[0070] Furthermore, the optical imaging system satisfies the following conditions: 1.49 < nd5 < 1.85, 1.49 < nd6 < 1.85. Where, nd5 is the refractive index of the fifth lens, nd6 is the refractive index of the sixth lens. By controlling the fifth lens and the sixth lens, it is beneficial to balance the spherical aberration generated by the first four lenses, and thus effectively control the spherical aberration of the system.

[0071] Embodiment 1

[0072] 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 1 of the present application.

[0073] As Figure 1 shown, the optical imaging lens according to an exemplary embodiment of the present application sequentially includes, along the optical axis from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, an aperture 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 S15.

[0074] 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 S4 being convex and its image-side surface S5 being convex. The fourth lens E4 has positive optical power, with its object-side surface S6 being convex and its image-side surface S7 being convex. The fifth lens E5 has positive optical power, with its object-side surface S8 being convex and its image-side surface S9 being concave. The sixth lens E6 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being convex. The seventh lens E7 has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being convex. The filter E8 has an object-side surface S13 and an image-side surface S14. Light from the object passes sequentially through surfaces S1 to S14 and is finally imaged onto the imaging surface S15.

[0075] 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).

[0076] Table 1

[0077]

[0078] In Table 1, the object-side surface and image-side surface of either the second lens E2 or the seventh lens E7 are aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0079]

[0080] 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.

[0081] Table 2

[0082]

[0083] Figure 2 The 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. Figure 3 The MTF curve of the optical imaging lens of Example 1 is shown, representing the MTF values ​​in the meridional and sagittal directions at different spatial frequencies. The optical imaging lens given in Example 1 can achieve good imaging quality.

[0084] Example 2

[0085] 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.

[0086] 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 S15.

[0087] 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 S4 being convex and its image-side surface S5 being convex. The fourth lens E4 has positive optical power, with its object-side surface S6 being convex and its image-side surface S7 being convex. The fifth lens E5 has positive optical power, with its object-side surface S8 being convex and its image-side surface S9 being convex. The sixth lens E6 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being flat. The seventh lens E7 has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being convex. The filter E8 has an object-side surface S13 and an image-side surface S14. Light from the object passes sequentially through surfaces S1 to S14 and is finally imaged onto the imaging surface S15.

[0088] 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).

[0089] Table 3

[0090]

[0091] In Table 3, the object-side surface and image-side surface of any one of the lenses from the second lens E2 to the sixth lens E6 are aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0092]

[0093] 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, and A14 that can be used for each aspherical surface in Example 2.

[0094] Table 4

[0095]

[0096] 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. Figure 6 The MTF curve of the optical imaging lens of Example 2 is shown, representing the MTF values ​​in the meridional and sagittal directions at different spatial frequencies. The optical imaging lens given in Example 2 achieves good imaging quality.

[0097] Example 3

[0098] 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.

[0099] 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, an aperture stop 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 S15.

[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 S4 being convex and its image-side surface S5 being convex. The fourth lens E4 has positive optical power, with its object-side surface S6 being convex and its image-side surface S7 being concave. The fifth lens E5 has negative optical power, with its object-side surface S8 being convex and its image-side surface S9 being concave. The sixth lens E6 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being convex. The seventh lens E7 has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being convex. The filter E8 has an object-side surface S13 and an image-side surface S14. Light from the object passes sequentially through surfaces S1 to S14 and is finally imaged onto the imaging surface S15.

[0101] 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).

[0102] Table 5

[0103]

[0104] In Table 5, the object-side surface and image-side surface of any one of the lenses from the second lens E2 to the sixth lens E6 are aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[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 6 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 3.

[0107] Table 6

[0108]

[0109] 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. Figure 9 The MTF curve of the optical imaging lens of Example 3 is shown, representing the MTF values ​​in the meridional and sagittal directions at different spatial frequencies. The optical imaging lens given in Example 3 can achieve good imaging quality.

[0110] 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, wide-angle lens, and small overall length. It has a compact structure, is easy to manufacture and install, and the large aperture configuration can increase the amount of light entering the optical system and achieve higher image quality.

[0111] 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 high-pixel, large-aperture vehicle-mounted 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 object side is concave, as is its image side; The third lens has positive optical power, and its object side is convex, and its image side is convex. The fourth lens has positive optical power and its object side is convex. The fifth lens has optical power and its object side is convex. The sixth lens has optical power; The seventh lens has negative optical power, its object side is concave, and its image side is convex. At least one of the fifth and sixth lenses has positive optical power; The optical imaging system satisfies the following relationship: 0.1mm / ° < TTL / DFOV <1.0 mm / °; 1.7 < R11 / R12 < 2.9; -1.4 < R21 / R22 < -0.2; -2.0 < R31 / R32 < -0.5; -0.4 < R41 / R42 < 0.4; 1 <|R51 / R52| < 4.5; 1.1 < R71 / R72 < 9.6; Wherein, DFOV is the field of view of the optical imaging system, TTL is the distance from the object-side surface of the first lens to the imaging plane, R11 is the radius of curvature of the object-side surface of the first lens, R12 is the radius of curvature of the image-side surface of the first lens; R21 is the radius of curvature of the object-side surface of the second lens, R22 is the radius of curvature of the image-side surface of the second lens; R31 is the radius of curvature of the object-side surface of the third lens, R32 is the radius of curvature of the image-side surface of the third lens; R41 is the radius of curvature of the object-side surface of the fourth lens, R42 is the radius of curvature of the image-side surface of the fourth lens; R51 is the radius of curvature of the object-side surface of the fifth lens, R52 is the radius of curvature of the image-side surface of the fifth lens; R71 is the radius of curvature of the object-side surface of the seventh lens, R72 is the radius of curvature of the image-side surface of the seventh lens.

2. The high-pixel, large-aperture vehicle-mounted optical imaging system according to claim 1, characterized in that: The optical imaging system satisfies the following relationship: 0.9 < f*tan(HFOV) / DT1 < 1.1; 1.1 < f*tan(HFOV) / DT2 < 1.6; 1.1 < f*tan(HFOV) / DT3 < 1.6; 1.1 < f*tan(HFOV) / DT4 < 1.5; 1.3 < f*tan(HFOV) / DT5 < 1.6; 1.1 < f*tan(HFOV) / DT6 < 1.6; 1.1 < f*tan(HFOV) / DT7 < 1.5; Where f is the effective focal length of the optical imaging system, HFOV is half of the maximum field of view of the optical imaging system, DT1 is the maximum effective radius of the first lens, DT2 is the maximum effective radius of the second lens, DT3 is the maximum effective radius of the third lens, DT4 is the maximum effective radius of the fourth lens, DT5 is the maximum effective radius of the fifth lens, DT6 is the maximum effective radius of the sixth lens, and DT7 is the maximum effective radius of the seventh lens.

3. The high-pixel, large-aperture vehicle-mounted optical imaging system according to claim 1, characterized in that: The optical imaging system satisfies the following relationship: -4 < fi(i=1,2,3,4,5,6) / f <4; Where fi (i=1,2,3,4,5,6) are the effective focal lengths of the first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens, respectively, and f is the effective focal length of the optical imaging system.

4. The high-pixel, large-aperture vehicle-mounted optical imaging system according to any one of claims 1-3, characterized in that: The optical imaging system satisfies the following relationship: 0 < |f4 / f7| < 1; 0 < |f1 / f23| < 1; 0.4 < |f1 / f56| < 1.2; Where f1 is the effective focal length of the first lens, f4 is the effective focal length of the fourth lens, f7 is the effective focal length of the seventh lens, f23 is the effective combined focal length of the second and third lenses, and f56 is the effective combined focal length of the fifth and sixth lenses.

5. The high-pixel, large-aperture vehicle-mounted optical imaging system according to any one of claims 1-3, characterized in that: The optical imaging system satisfies the following relationship: 15 < vd4 / nd4 < 55; 10 < vd7 / nd7 < 55; 1.49 < nd5 < 1.85; 1.49 < nd6 < 1.85; Wherein, nd4 is the refractive index of the fourth lens, vd4 is the Abbe number of the fourth lens; nd7 is the refractive index of the seventh lens, vd7 is the Abbe number of the seventh lens; nd5 is the refractive index of the fifth lens; and nd6 is the refractive index of the sixth lens.

6. The high-pixel, large-aperture vehicle-mounted optical imaging system according to any one of claims 1-3, characterized in that: The optical imaging system satisfies the following relationship: 0.5 < f / BFL < 3; Where f is the effective focal length of the optical imaging system, and BFL is the distance on the optical axis from the image side of the seventh lens to the imaging plane.

7. The high-pixel, large-aperture vehicle-mounted optical imaging system according to any one of claims 1-3, characterized in that: The optical imaging system satisfies the following relationship: 0.2 < CT1 / ET1 < 1.5; Wherein, CT1 is the center thickness of the first lens, and ET1 is the edge thickness of the first lens.

8. The high-pixel, large-aperture vehicle-mounted optical imaging system according to any one of claims 1-3, characterized in that: The first, second, third, fifth, and sixth lenses are spherical lenses, while the fourth and seventh lenses are aspherical lenses.

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

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