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

Abstract

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

Description

Technical Field

[0001] This application relates to the field of optical imaging, and more particularly to a vehicle-mounted optical imaging system and a camera module for its application. Background Technology

[0002] With the rapid development of automotive driver assistance systems, optical lenses are being used more and more widely in automobiles. At the same time, users are demanding higher image quality from these lenses. To acquire information more accurately, the system needs to be equipped with larger, higher-resolution chips, thus placing increasingly higher demands on the resolving power of the automotive optical lenses themselves. Furthermore, for safety reasons, automotive optical lenses used in autonomous driving require high stability and must be able to withstand various harsh environments to avoid significant performance degradation under different conditions.

[0003] While existing optical lenses can achieve megapixel resolution, they suffer from significant aberrations such as chromatic aberration, astigmatism, and distortion. Furthermore, their light-gathering ability is limited, resulting in insufficient light intake in low-light environments like nighttime or rainy days. They also experience image blurring in extreme high and low temperatures, exhibiting poor thermal stability; their resolution often fails to meet requirements after returning to room temperature. Additionally, they are costly and heavy. Utility Model Content

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

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] A 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.

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

[0008] The second lens has optical power;

[0009] The third lens has optical power;

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

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

[0012] The sixth lens has negative optical power and its object side is concave.

[0013] The seventh lens has positive optical power and its object-side surface is convex.

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

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

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

[0017] Where f is the effective focal length of the optical imaging system, f12 is the effective combined focal length of the first and second lenses, and f123 is the effective combined focal length of the first, second, and third lenses.

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

[0019] 1.4 <f / EPD ≤ 1.7;

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

[0021] 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 plane, ImgH is half the diagonal length of the effective pixel area on the imaging plane, and DT11 is the maximum effective radius of the object side of the first lens.

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

[0023] 1.5 <DT11 / DT72<2.2;

[0024] 3.1 <DT11 / SAG1<4.7;

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

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

[0027] 2.0 <f45 / f<5.0;

[0028] Where f is the effective focal length of the optical imaging system, and f45 is the combined focal length of the fourth and fifth lenses.

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

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

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

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

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

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

[0035] -2.0 <R4 / f ≤ 0.9;

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

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

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

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

[0040] Furthermore, the F-number of the vehicle-mounted optical imaging system is 1.4 to 1.7; the total optical length of the vehicle-mounted optical imaging system is ≤22 mm.

[0041] Furthermore, the fourth and seventh lenses are aspherical lenses, either the second or third lens is an aspherical lens, and the rest are spherical lenses.

[0042] On the other hand, embodiments of this application also provide a camera module, which includes at least an optical lens, and the above-mentioned vehicle-mounted optical imaging system is installed in the optical lens.

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

[0044] This invention provides a vehicle-mounted optical imaging system and its camera module, which consists of seven lenses. The first lens has negative optical power, with a convex object-side surface and a concave image-side surface. The second lens has optical power, the third lens has optical power, the fourth lens has positive optical power, with a convex object-side surface and a convex image-side surface, the fifth lens has optical power, with a convex object-side surface and a convex image-side surface, the sixth lens has negative optical power and a concave object-side surface, and the seventh lens has positive optical power and a convex object-side surface. By rationally configuring the refractive power and surface shape of each lens, the optical lens has advantages such as large aperture, low cost, miniaturization, and good image quality. At the same time, it can also capture object detail information better, improve the optical lens's ability to capture details of the photographed object, improve the image quality of the optical lens, and improve the resolution and image clarity of the optical lens to meet the requirements of autonomous driving applications. Attached Figure Description

[0045] 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.

[0046] Figure 1 This is a schematic diagram of the structure of the optical imaging system or camera module of Embodiment 1 of this application;

[0047] Figure 2 These are the on-axis chromatic aberration, astigmatism, and distortion curves of the optical imaging system or camera module of Embodiment 1 of this application;

[0048] Figure 3 This is a schematic diagram of the structure of the optical imaging system or camera module according to Embodiment 2 of this application;

[0049] Figure 4 These are the on-axis chromatic aberration, astigmatism, and distortion curves of the optical imaging system or camera module in Embodiment 2 of this application;

[0050] Figure 5 This is a schematic diagram of the structure of the optical imaging system or camera module of Embodiment 3 of this application;

[0051] Figure 6 These are the on-axis chromatic aberration, astigmatism, and distortion curves of the optical imaging system or camera module in Embodiment 3 of this application;

[0052] Figure 7 This is a schematic diagram of the structure of the optical imaging system or camera module of Embodiment 4 of this application;

[0053] Figure 8 These are the on-axis chromatic aberration, astigmatism, and distortion curves of the optical imaging system or camera module in Embodiment 4 of this application. Detailed Implementation

[0054] like Figure 1-8 As shown, this application provides an in-vehicle optical imaging system, which is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens in sequence along the optical axis from the object plane to the image plane;

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

[0056] The second lens has optical power;

[0057] The third lens has optical power;

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

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

[0060] The sixth lens has negative optical power and its object side is concave.

[0061] The seventh lens has positive optical power and its object-side surface is convex.

[0062] This utility model discloses an in-vehicle optical imaging system composed of 7 lenses. By rationally configuring the refractive power and surface shape of each lens, the optical lens has advantages such as large aperture, low cost, miniaturization, and good image quality. At the same time, it can also capture object detail information better, improve the optical lens's ability to capture the details of the photographed object, improve the image quality of the optical lens, and improve the resolution and image clarity of the optical lens to meet the requirements of autonomous driving applications.

[0063] Furthermore, the vehicle-mounted optical imaging system satisfies the following relationships: 1.4 < f / EPD ≤ 1.7, 27 < TTL / ImgH*DT11 < 37, where f is the effective focal length of the optical imaging system, EPD is the entrance pupil diameter of the optical imaging lens, TTL is the axial distance from the object side surface of the first lens to the imaging surface, ImgH is half of the diagonal length of the effective pixel area on the imaging surface, and DT11 is the maximum effective radius of the object side surface of the first lens. By controlling the ratio of TTL / Imgh, the optical system has good thin and light characteristics. Adding the limitation of the maximum effective radius of the first lens of the optical system can make the front end of the optical system have a small aperture, ensuring that the optical system has the characteristics of a large aperture, miniaturization, and thinness. When it is lower than the lower limit of the relational expression, while ensuring that the optical lens has a small aperture, the TTL of the optical lens increases, which is not conducive to the miniaturization of the lens; when it exceeds the upper limit of the relational expression, it is not conducive to the expansion of the imaging surface of the optical imaging system, reducing the resolution and imaging resolution of the optical system.

[0064] Furthermore, the vehicle-mounted optical imaging system satisfies the following relationship: 1.5 < DT11 / DT72 < 2.2, where DT11 is the maximum effective radius of the object side surface of the first lens, and DT72 is the maximum effective radius of the image side surface of the seventh lens. By restricting the ratio of the maximum effective radius of the object side surface of the first lens to the maximum effective radius of the image side surface of the seventh lens, the aperture relationship between the first lens and the eighth lens under a large field angle can be reasonably controlled, keeping the maximum effective radius of the first lens within a reasonable range, so that the optical lens has the characteristic of a small aperture. When it is lower than the lower limit of the relational expression, the difference in aperture between the first lens and the seventh lens decreases, which is not conducive to the reduction of the head of the optical system and the improvement of compactness. When it exceeds the upper limit of the relational expression, the aperture of the seventh lens is excessively compressed, which is not conducive to the improvement of the image quality of the optical system and the correction of distortion.

[0065] Furthermore, the vehicle-mounted optical imaging system satisfies the following relationship: -3.0 < f123 / f < -0.7, where f123 is the effective combined focal length of the first lens, the second lens, and the third lens, and f is the effective focal length of the optical imaging system. By restricting the ratio of the combined focal length of the first lens, the second lens, and the third lens to the effective focal length of the optical lens, the optical power of the optical system can be more reasonably distributed to the first lens, the second lens, and the third lens, reducing the optical power pressure on the first lens, which helps to reduce the aperture of the first lens and meet the characteristic of a small aperture. At the same time, it can also quickly converge light, thus refracting paraxial light at a low deflection angle and reducing spherical aberration.

[0066] Furthermore, the vehicle-mounted optical imaging system satisfies the following relationship: -2.7 < (SAG11 - SAG12) / CT6 < -1.3, where CT6 is the thickness of the sixth lens on the optical axis, SAG11 is the distance parallel to the optical axis from the maximum effective clear aperture of the object side of the sixth lens to the intersection of the object side of the sixth lens and the optical axis, and SAG12 is the distance parallel to the optical axis from the maximum effective clear aperture of the image side of the sixth lens to the intersection of the image side of the sixth lens and the optical axis. By defining the range of the above conditional formula, the ratio of the sagittal heights of the object side and the image side of the sixth lens to the central thickness can be reasonably configured, thereby reasonably controlling the shape of the sixth lens, so that the surface shape of the sixth lens is not too curved, which is beneficial to reducing the tolerance sensitivity of the sixth lens, and further beneficial to the processing and forming of the sixth lens, and better realizing engineering manufacturing.

[0067] Furthermore, the vehicle-mounted optical imaging system satisfies the following relationship: -1.7 < R10 / CT5 < -0.9, where R10 is the radius of curvature of the image side of the fifth lens, and CT5 is the thickness of the fifth lens on the optical axis. By defining the range of the ratio of the radius of curvature of the image side of the fifth lens to the thickness of the fifth lens on the optical axis, it is beneficial to the reasonable deflection of light rays in the fifth lens, and further beneficial to the improvement of the system MTF, thereby improving the resolution of the system imaging. Below the lower limit of the above conditional formula, the radius of curvature of the image side of the fifth lens is too large, resulting in an increased risk of ghost images due to the easy reflection of light rays on the image side of the fifth lens. Exceeding the upper limit of the above conditional formula, the central thickness of the fifth lens is too large, resulting in unreasonable deflection of light rays in the fifth lens, which is not beneficial to the improvement of the system MTF.

[0068] Furthermore, the vehicle-mounted optical imaging system satisfies the following relationship: -2.0 < R4 / f ≤ 0.9, where R4 is the radius of curvature of the image side of the second lens, and f is the effective focal length of the optical imaging system. By defining the range of the above relational formula, it is beneficial to restricting the curvature of the image side of the second lens, allowing more light rays to enter the optical system. At the same time, it is also beneficial to reasonably distribute the refractive power of the optical system and correct the off-axis aberration of the optical system. Below the lower limit of the relational formula, the focal length of the optical system is too large, which is not beneficial to realizing the miniaturization characteristics, and further affects the thinness and lightness of the entire optical system; exceeding the upper limit of the relational formula, the radius of curvature of the image side of the second lens is too small, and the image side of the second lens is too curved, thereby increasing the risk of ghost images.

[0069] Furthermore, the in-vehicle optical imaging system satisfies the following relationship: 3.6 < CT3 / |SAG6| < 7.5, where CT3 is the thickness of the third lens on the optical axis, and SAG6 is the distance parallel to the optical axis from the maximum effective aperture of the image side of the third lens to the intersection of the image side of the third lens and the optical axis. By controlling the ratio range of the central thickness of the third lens to the sagittal height of the image side of the third lens, it is possible to make the third lens have a high refractive power while avoiding excessive central thickness or overly curved image side of the third lens, which increases the manufacturing difficulty of the third lens, thereby reducing the production cost of the third lens. When below the lower limit of the above relationship, the image side of the third lens is overly curved, resulting in an increase in the processing difficulty of the third lens and further increasing the production cost; when exceeding the upper limit of the above relationship, the thickness value of the third lens is too large, which is not conducive to the lightweight and miniaturization of the optical lens.

[0070] Furthermore, the in-vehicle optical imaging system satisfies the following relationship: 0.4 < (T12 + CT2) / (T23 + CT3) < 3.7, where T12 is the distance on the optical axis from the image side of the first lens to the object side of the second lens, T23 is the distance on the optical axis from the image side of the second lens to the object side of the third lens, CT2 is the thickness of the second lens on the optical axis, and CT3 is the thickness of the third lens on the optical axis. When the optical system satisfies the above conditional formula, it is beneficial to correct the high-order aberrations of the system, improve the imaging resolution, and at the same time ensure the compact structure of the system and meet the requirements of miniaturization. When (T12 + CT2) / (T23 + CT3) ≤ 0.4 or (T12 + CT2) / (T23 + CT3) ≥ 3.7, it is not conducive to the correction of the high-order aberrations of the optical system, thereby reducing the imaging quality. At the same time, the setting of excessive air gaps and lens thicknesses will increase the total length of the optical system, which is not conducive to the miniaturization of the optical system.

[0071] Furthermore, the in-vehicle optical imaging system satisfies the following relationship: 3.1 < DT11 / SAG1 < 4.7, where DT11 is the maximum effective radius of the object side of the first lens, and SAG1 is the distance parallel to the optical axis from the maximum effective aperture of the object side of the first lens to the intersection of the object side of the first lens and the optical axis. By controlling the ratio range of the above sub-formula, it is beneficial to reduce the risk of aberrations generated at the edge of the first lens and avoid overly curved object side of the first lens, which increases the manufacturing difficulty of the first lens. Below the lower limit of the relationship, the sagittal height of the object side of the first lens is too large, resulting in an overly curved object side of the first lens, increasing the manufacturing difficulty and at the same time easily causing serious deflection of the marginal rays, which is not conducive to correcting the aberrations of the optical system, thereby reducing the imaging quality of the optical system; exceeding the upper limit of the relationship, the maximum effective radius of the object side of the third lens increases, making the aperture of the first lens increase, which is not conducive to the miniaturization of the optical system.

[0072] Furthermore, the vehicle-mounted optical imaging system satisfies the following relationship: 1.8 < (f - f12) / f < 4.0, where f is the effective focal length of the optical imaging system, and f12 is the effective combined focal length of the first lens and the second lens. By reasonably controlling the ratio range of the combined focal length of the first lens and the second lens to the effective focal length of the optical imaging system, the optical system can satisfy a large field angle while obtaining a high imaging resolution. Exceeding the upper limit of the relational expression, the refractive power of the second lens is insufficient, and it is difficult for large-angle light rays to enter the optical system, which is not conducive to expanding the field angle range of the optical system; below the lower limit of the relational expression, the refractive power of the second lens is too strong, easily generating strong astigmatism and chromatic aberration, which is not conducive to high-resolution imaging characteristics.

[0073] Furthermore, the vehicle-mounted optical imaging system satisfies the following relationship: 2.0 < f45 / f < 5.0, where f45 is the combined focal length of the fourth lens and the fifth lens, and f is the effective focal length of the optical imaging system. By restricting the ratio of the combined focal length of the fourth lens and the fifth lens to the effective focal length of the optical imaging system, the optical power and surface shape of the fourth lens and the fifth lens can be reasonably distributed, thereby controlling off-axis aberrations and improving imaging quality; at the same time, it avoids the surface shape of the fourth lens and the fifth lens from being too curved, thus increasing the manufacturing difficulty.

[0074] In the specific embodiments of the present application, in Embodiment 1, Embodiment 2, and Embodiment 3, the second lens, the fourth lens, and the seventh lens are aspherical lenses, and the rest are spherical lenses, and they are all separated by air intervals. In Embodiment 4, the third lens, the fourth lens, and the seventh lens are aspherical lenses, and the rest are spherical lenses, and they are all separated by air intervals; the F number of the optical imaging system is 1.4 to 1.7; the total optical length of the optical imaging system ≤ 22 mm. The embodiments of the present utility model disclose a vehicle-mounted optical imaging system. By selecting 3 aspherical lenses and 4 spherical lenses and reasonably configuring the refractive power and surface shape of each lens, the optical lens has the advantages of a large aperture, low cost, miniaturization, good imaging quality, etc. At the same time, it can also better capture the detailed information of the object, improve the ability of the optical lens to capture the details of the photographed object, improve the texture of the optical lens, improve the resolution and imaging clarity of the optical lens, so as to meet the requirements of autonomous driving applications.

[0075] Embodiment 1

[0076] The following refers to Figures 1 to 2 Describe the optical imaging lens according to Embodiment 1 of the present application. Figure 1 The structural schematic diagram of the optical imaging lens according to Embodiment 1 of the present application is shown.

[0077] As Figure 1As 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 STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an infrared filter E8, and an imaging surface S16.

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

[0079] 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).

[0080] Table 1

[0081]

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

[0083]

[0084] Where Z is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, r is the radial coordinate of the aspherical surface, c is the curvature of the vertex of the aspherical surface, K is the conic coefficient, Am is the aspherical coefficient, and r max The maximum value of the radial radius coordinate is u = r / r max Table 2 provides the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28 and A30 for each aspherical surface that can be used in the first embodiment.

[0085] Table 2

[0086]

[0087] Figure 2 The on-axis chromatic aberration, astigmatism, and distortion curves of the optical imaging lens of Example 1 are shown. On-axis chromatic aberration represents the deviation of the focal point of light of different wavelengths after passing through the lens; astigmatism represents the curvature of the meridional and sagittal image planes; distortion represents the magnitude of distortion at different image heights. The optical imaging lens given in Example 1 can achieve good image quality.

[0088] Example 2

[0089] Reference Figures 3 to 4 Describes an optical imaging lens according to Embodiment 2 of this application. Figure 3 A schematic diagram of the structure of an optical imaging lens according to Embodiment 2 of this application is shown.

[0090] like Figure 3 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 STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an infrared filter E8, and an imaging surface S16.

[0091] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being convex. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being 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 convex and its image-side surface S10 being convex. The sixth lens E6 has negative optical power, with its object-side surface S10 being concave and its image-side surface S11 being concave. The seventh lens E7 has positive optical power, with its object-side surface S12 being convex 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.

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

[0093] Table 3

[0094]

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

[0096]

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

[0098] Table 4

[0099]

[0100] Figure 4 The on-axis chromatic aberration, astigmatism, and distortion curves of the optical imaging lens of Example 2 are shown. On-axis chromatic aberration represents the deviation of the focal point of light of different wavelengths after passing through the lens; astigmatism represents the curvature of the meridional and sagittal image planes; distortion represents the magnitude of distortion at different image heights. The optical imaging lens given in Example 2 can achieve good image quality.

[0101] Example 3

[0102] The following is for reference Figures 5 to 6 Describes an optical imaging lens according to Embodiment 3 of this application. Figure 5 A schematic diagram of the structure of an optical imaging lens according to Embodiment 3 of this application is shown.

[0103] like Figure 5 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 STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an infrared filter E8, and an imaging surface S16.

[0104] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being concave and its image-side surface S4 being convex. The third lens E3 has negative 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 convex and its image-side surface S10 being convex. The sixth lens E6 has negative optical power, with its object-side surface S10 being concave and its image-side surface S11 being convex. The seventh lens E7 has positive optical power, with its object-side surface S12 being convex and its image-side surface S13 being concave. The filter E8 has an object-side surface S14 and an image-side surface S15. Light from the object passes sequentially through surfaces S1 to S15 and is finally imaged onto the imaging surface S16.

[0105] 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).

[0106] Table 5

[0107]

[0108] In Table 5, the object-side surface and image-side surface of any one of the second lens E2, the fourth lens E4, and the seventh lens E7 are Q-type aspherical surfaces. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0109]

[0110] Where Z is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, r is the radial coordinate of the aspherical surface, c is the curvature of the vertex of the aspherical surface, K is the conic coefficient, Am is the aspherical coefficient, and r max The maximum value of the radial radius coordinate is u = r / r max Table 6 provides the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28 and A30 for each aspherical surface that can be used in the third embodiment.

[0111] Table 6

[0112]

[0113] Figure 6The on-axis chromatic aberration, astigmatism, and distortion curves of the optical imaging lens of Example 3 are shown. On-axis chromatic aberration represents the deviation of the focal point of light of different wavelengths after passing through the lens; astigmatism represents the curvature of the meridional and sagittal image planes; distortion represents the magnitude of distortion at different image heights. The optical imaging lens given in Example 3 can achieve good image quality.

[0114] Example 4

[0115] The following is for reference Figures 7 to 8 The optical imaging lens according to Embodiment 4 of this application is described. Figure 7 A schematic diagram of the structure of an optical imaging lens according to Embodiment 4 of this application is shown.

[0116] 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, a STO, a fifth lens E5, a sixth lens E6, a seventh lens E7, an infrared filter E8, and an imaging surface S16.

[0117] The first lens E1 has 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 negative 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 convex and its image-side surface S10 being convex. The sixth lens E6 has negative optical power, with its object-side surface S10 being concave and its image-side surface S11 being concave. The seventh lens E7 has positive optical power, with its object-side surface S12 being convex 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.

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

[0119] Table 7

[0120]

[0121] In Table 7, the object-side surface and image-side surface of any one of the third lens E3, the fourth lens E4, and the seventh lens E7 are Q-type aspherical surfaces. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula.

[0122]

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

[0124] Table 8

[0125]

[0126] Figure 8 The on-axis chromatic aberration, astigmatism, and distortion curves of the optical imaging lens of Example 4 are shown. On-axis chromatic aberration represents the deviation of the focal point of light of different wavelengths after passing through the lens; astigmatism represents the curvature of the meridional and sagittal image planes; distortion represents the magnitude of distortion at different image heights. The optical imaging lens given in Example 4 can achieve good image quality.

[0127] In Examples 1-4, the basic data is as follows:

[0128] Table 9

[0129]

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

[0131] Table 10

[0132]

[0133] A camera module includes at least an optical lens, in which the aforementioned vehicle-mounted optical imaging system is installed. By selecting an appropriate number of lenses and rationally configuring the refractive power and surface shape of each lens, the optical lens has the characteristics of large light transmission, low cost, miniaturization, and good image quality. At the same time, it can also capture object detail information better, improve the optical lens's ability to capture the details of the photographed object, improve the image quality of the optical lens, and improve the resolution and image clarity of the optical lens to meet the requirements of autonomous driving applications.

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

Claims

1. A vehicle-mounted optical imaging system, characterized in that: Along the optical axis from the object plane to the image plane, the lenses are sequentially arranged as follows: first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, and seventh lens. The first lens has negative optical power, its object side is convex, and its image side is concave. The second lens has optical power; The third lens has optical power; The fourth lens has positive optical power, and its object side is convex, and its image side is convex. The fifth lens has optical power, its object side is convex, and its image side is convex. The sixth lens has negative optical power and its object side is concave. The seventh lens has positive optical power and its object-side surface is convex. The vehicle-mounted optical imaging system satisfies the following relationship: 1.4 < f / EPD ≤ 1.7; 27 < TTL / ImgH*DT11 < 37; Where f is the effective focal length of the optical imaging system, EPD is the entrance pupil diameter of the optical imaging lens, TTL is the on-axis distance from the object side of the first lens to the imaging plane, ImgH is half the diagonal length of the effective pixel area on the imaging plane, and DT11 is the maximum effective radius of the object side of the first lens.

2. The vehicle-mounted optical imaging system according to claim 1, characterized in that: The vehicle-mounted optical imaging system satisfies the following relationship: -3.0 < f123 / f < -0.7; Where f is the effective focal length of the optical imaging system, and f123 is the effective combined focal length of the first lens, the second lens, and the third lens.

3. The vehicle-mounted optical imaging system according to claim 1, characterized in that: The vehicle-mounted optical imaging system satisfies the following relationship: 1.8 < (f-f12) / f < 4.0; Where f is the effective focal length of the optical imaging system, and f12 is the effective combined focal length of the first lens and the second lens.

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

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

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

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

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

9. The vehicle-mounted optical imaging system according to claim 1, characterized in that: The vehicle-mounted optical imaging system has an F-number of 1.4 to 1.7, and a total optical length of ≤22 mm; and / or The fourth and seventh lenses are aspherical lenses, either the second or third lens is an aspherical lens, and the rest are spherical lenses.

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

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