An optical imaging system and a camera module used therein

Abstract

The present invention provides an optical imaging system and a camera module used therein, which is composed of seven lenses. By selecting an appropriate number of lenses and rationally configuring the refractive power and surface shape of each lens, the optical lens has the advantages of large light throughput, small size, good imaging quality, and a large field of view. At the same time, it can also better capture object detail information, improve the optical lens's ability to capture details of the photographed object, improve the image quality of the optical lens, and enhance the resolution and imaging clarity of the optical lens, thereby meeting people's requirements for high-definition imaging of vehicle-mounted optical lenses.

Description

Technical Field

[0001] The present application relates to the field of optical imaging, and in particular to an optical imaging system and a camera module used therein. Background Art

[0002] With the rapid development of the automotive industry, the performance of automotive cameras is becoming increasingly advanced. Chip sizes are increasing, and so are the number of pixels. Pixels greater than 3 million are becoming increasingly mainstream. Consequently, lens design requirements are also increasing to ensure perfect coordination with the chip and ideal image quality. While maintaining pixel density, ultra-wide-angle lenses are becoming increasingly popular, offering a wide field of view. Furthermore, in darker environments such as at night or on rainy days, optical lenses are required to allow for a large amount of light to enter, ensuring good image quality even in low-light conditions. Furthermore, optical lenses are also required to maintain adequate resolution in both high and low temperature environments, ensuring image clarity that meets operational requirements. Furthermore, they must also meet the requirements for low cost and lightweight design.

[0003] However, existing optical lenses are limited by factors such as mounting location and processing, making it difficult to achieve miniaturization, high resolution, a wide field of view, and a large aperture. Furthermore, while existing optical lenses can achieve resolutions of megapixels, they suffer from significant aberrations such as chromatic aberration, astigmatism, and distortion. Furthermore, their light transmission capacity is limited, resulting in high imaging noise in low-light environments such as at night or on rainy days. They can also cause adverse effects such as unclear images in high and low temperature environments. Optical lenses also have poor thermal stability, making it difficult to meet resolution requirements even after returning to room temperature from high temperatures. Furthermore, they are costly and heavy. Summary of the Invention

[0004] In order to solve the problems of large size and general resolution of existing industrial lenses, the present invention provides an optical imaging system and a camera module used therein, which is composed of 7 lenses. By selecting an appropriate number of lenses and rationally configuring the refractive power and surface shape of each lens, the optical lens has the advantages of large light throughput, small size, good imaging quality, and a large field of view. At the same time, it can also better capture object detail information, 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 imaging clarity of the optical lens to meet people's high-definition imaging requirements for vehicle-mounted optical lenses.

[0005] The technical solutions adopted in this application are:

[0006] An optical imaging system, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens in sequence from an object plane to an image plane along an optical axis;

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

[0008] The second lens has optical power, its object side surface is concave, and its image side surface is convex;

[0009] The third lens has positive optical power;

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

[0011] The fifth lens has optical power;

[0012] The sixth lens has optical power;

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

[0014] The optical imaging system as described above satisfies the following relationship:

[0015] 1.4≤f / EPD≤1.6;

[0016] Where f is the effective focal length of the optical imaging system, and EPD is the entrance pupil diameter of the optical imaging lens.

[0017] The optical imaging system as described above satisfies the following relationship:

[0018] 110 <FOV / (TTL / IamgH / DT11)<140;

[0019] Wherein, FOV is the maximum field of view of the optical imaging system, DT11 is the maximum effective radius of the object side of the first lens, TTL is the axial distance from the object side of the first lens to the imaging surface, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface.

[0020] The optical imaging system as described above satisfies the following relationship:

[0021] 0 <f5 / (f5+f6)<2.8;

[0022] Wherein, f5 is the effective focal length of the fifth lens, and f6 is the effective focal length of the sixth lens.

[0023] The optical imaging system as described above satisfies the following relationship:

[0024] 1.8 <f345 / f<3.1;

[0025] Wherein, f345 is the effective combined focal length of the third lens, the fourth lens, and the fifth lens, and f is the effective focal length of the optical imaging system.

[0026] The optical imaging system as described above satisfies the following relationship:

[0027] 0.6<|f123| / f4567<3.5;

[0028] Among them, f123 is the effective combined focal length of the first lens, the second lens and the third lens, and f4567 is the effective combined focal length of the fourth lens, the fifth lens, the sixth lens and the seventh lens.

[0029] The optical imaging system as described above satisfies the following relationship:

[0030] 0<|(SAG14-SAG13) / (SAG8-SAG7)|<1.2;

[0031] Among them, SAG7 is the distance from the maximum effective aperture of the image side of the third lens to the intersection of the image side of the third lens and the optical axis in the direction parallel to the optical axis, SAG8 is the distance from the maximum effective aperture of the image side of the fourth lens to the intersection of the image side of the fourth lens and the optical axis in the direction parallel to the optical axis, SAG13 is the distance from the maximum effective aperture of the object side of the seventh lens to the intersection of the object side of the seventh lens and the optical axis in the direction parallel to the optical axis, and SAG14 is the distance from the maximum effective aperture of the image side of the seventh lens to the intersection of the image side of the seventh lens and the optical axis in the direction parallel to the optical axis.

[0032] The optical imaging system as described above satisfies the following relationship:

[0033] 1.2 <T12 / (SAG2+SAG3)<3.4;

[0034] 3.2 <DT32 / SAG7<6.2;

[0035] Among them, SAG2 is the distance from the maximum effective aperture of the image side of the first lens to the intersection of the image side of the first lens and the optical axis in the direction parallel to the optical axis, SAG3 is the distance from the maximum effective aperture of the object side of the second lens to the intersection of the object side of the second lens and the optical axis in the direction parallel to the optical axis, and T12 is the distance from the image side of the first lens to the object side of the second lens on the optical axis.

[0036] The optical imaging system as described above satisfies the following relationship:

[0037] 3.2 <DT32 / SAG7<6.2;

[0038] Among them, SAG7 is the distance from the maximum effective aperture of the image side of the third lens to the intersection of the image side of the third lens and the optical axis in the direction parallel to the optical axis, and DT32 is the maximum effective radius of the image side of the third lens.

[0039] The optical imaging system as described above satisfies the following relationship:

[0040] 0.3<(CT6+CT7) / BFL<1.7;

[0041] Wherein, CT6 is the thickness of the sixth lens on the optical axis, CT7 is the thickness of the seventh lens on the optical axis, and BFL is the minimum distance from the image side surface of the seventh lens to the imaging plane of the optical system in the optical axis direction.

[0042] The optical imaging system as described above satisfies the following relationship:

[0043] 2.6 <CT3 / |SAG5|<6.0;

[0044] Among them, CT3 is the thickness of the third lens on the optical axis, and SAG5 is the distance from the maximum effective aperture of the object side of the third lens to the intersection of the object side of the third lens and the optical axis in the direction parallel to the optical axis.

[0045] The optical imaging system as described above satisfies the following relationship:

[0046] 0.5<(R7-R8) / R7<3.6;

[0047] Among them, R7 is the curvature radius of the object side of the fourth lens, and R8 is the curvature radius of the image side of the fourth lens.

[0048] The optical imaging system as described above satisfies the following relationship:

[0049] 0.3<(R13+R14) / |R13-R14|<3.8;

[0050] Among them, R13 is the curvature radius of the object side of the seventh lens, and R14 is the curvature radius of the image side of the seventh lens.

[0051] In the optical imaging system as described above, the F number of the optical imaging system is 1.4 to 1.6; and the total optical length of the optical imaging system is ≤21 mm.

[0052] In the optical imaging system as described above, the seventh lens is an aspheric lens, one of the second lens, the third lens and the sixth lens is an aspheric lens, and the remaining lenses are spherical lenses.

[0053] On the other hand, an embodiment of the present application further provides a camera module, which includes at least an optical lens, in which the above-mentioned optical imaging system is installed.

[0054] Compared with the prior art, the present invention has the following advantages:

[0055] The present invention provides an optical imaging system and a camera module used therein, which is composed of seven lenses. By selecting an appropriate number of lenses and rationally configuring the refractive power and surface shape of each lens, the optical lens has the advantages of large light throughput, small size, good imaging quality, and a large field of view. At the same time, it can also better capture object detail information, improve the optical lens's ability to capture details of the photographed object, improve the image quality of the optical lens, and enhance the resolution and imaging clarity of the optical lens, thereby meeting people's requirements for high-definition imaging of vehicle-mounted optical lenses. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments.

[0057] Figure 1 1 is a schematic structural diagram of an optical imaging system or camera module according to Example 1 of the present application;

[0058] Figure 2 axial chromatic aberration, astigmatism, and distortion curves of the optical imaging system or camera module of Example 1 of the present application;

[0059] Figure 3 2 is a schematic structural diagram of an optical imaging system or camera module according to embodiment 2 of the present application;

[0060] Figure 4 axial chromatic aberration, astigmatism, and distortion curves of the optical imaging system or camera module of Example 2 of the present application;

[0061] Figure 5 3 is a schematic structural diagram of an optical imaging system or camera module according to Example 3 of the present application;

[0062] Figure 6 axial chromatic aberration, astigmatism, and distortion curves of the optical imaging system or camera module of Example 3 of the present application;

[0063] Figure 7 4 is a schematic structural diagram of an optical imaging system or camera module according to embodiment 4 of the present application;

[0064] Figure 8 These are the on-axis chromatic aberration, astigmatism and distortion curves of the optical imaging system or camera module of Example 4 of the present application. DETAILED DESCRIPTION

[0065] An optical imaging system, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens in sequence from an object plane to an image plane along an optical axis;

[0066] The first lens has negative optical power, its object side surface is convex, and its image side surface is concave;

[0067] The second lens has optical power, its object side surface is concave, and its image side surface is convex;

[0068] The third lens has positive optical power;

[0069] The fourth lens has positive refractive power and its object side surface is convex;

[0070] The fifth lens has optical power;

[0071] The sixth lens has optical power;

[0072] The seventh lens has optical power, and its object-side surface is convex.

[0073] The optical imaging system of the embodiment of the present application is composed of 7 lenses. By selecting an appropriate number of lenses and rationally configuring the refractive power and surface shape of each lens, the optical lens has the advantages of large light throughput, small size, good imaging quality, and a large field of view. At the same time, it can also better capture object detail information, 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 imaging clarity of the optical lens to meet people's high-definition imaging requirements for vehicle-mounted optical lenses.

[0074] Furthermore, the optical imaging system satisfies the following relationship:

[0075] 1.4≤f / EPD≤1.6;

[0076] 110 <FOV / (TTL / IamgH / DT11)<140;

[0077] Where f is the effective focal length of the optical imaging system, EPD is the entrance pupil diameter of the optical imaging lens, FOV is the maximum field of view of the optical imaging system, DT11 is the maximum effective radius of the object side of the first lens, TTL is the on-axis distance from the object side of the first lens to the imaging surface, and ImgH is half the diagonal length of the effective pixel area on the imaging surface. This relationship reflects the constraints on the field of view and thinness of the optical lens, allowing the optical system to meet wide-angle requirements while also maintaining excellent thinness, ensuring the optical system's wide-angle, large aperture, miniaturization, and thinness. When the ratio falls below the lower limit of the relationship, while ensuring a wide field of view, the optical lens's TTL / IamgH / DT11 further increases, making it difficult for the optical lens to achieve good imaging resolution. When the ratio exceeds the upper limit, the thinness of the optical lens is excessively compressed, which is detrimental to improving its performance.

[0078] Furthermore, the optical imaging system satisfies the following relationship:

[0079] 0 <f5 / (f5+f6)<2.8;

[0080] Where f5 is the effective focal length of the fifth lens element, and f6 is the effective focal length of the sixth lens element. By properly distributing the focal powers of the fifth and sixth optical elements closest to the image plane within a reasonable ratio, the spherical aberration remaining after balancing can be used to balance the spherical aberration generated by the first four elements, thereby fine-tuning and controlling the system's spherical aberration and enhancing precise control of on-axis field aberrations.

[0081] Furthermore, the optical imaging system satisfies the following relationship:

[0082] 1.8 <f345 / f<3.1;

[0083] Here, f345 is the effective combined focal length of the third, fourth, and fifth lenses, and f is the effective focal length of the optical imaging system. By constraining the ratio of the combined focal length of the third, fourth, and fifth lenses to the effective focal length of the optical lens, the focal powers of the third, fourth, and fifth lenses can be properly distributed, allowing for diverse coordination of the fourth lens. This balances the internal aberrations of the optical lens while maintaining a compact design. This in turn helps adjust the field curvature and astigmatism at the imaging edge of the optical lens, ensuring optimal imaging quality for the surrounding environment.

[0084] Furthermore, the optical imaging system satisfies the following relationship:

[0085] 0.6<|f123| / f4567<3.5;

[0086] Here, f123 is the effective combined focal length of the first, second, and third lenses, and f4567 is the effective combined focal length of the fourth, fifth, sixth, and seventh lenses. By controlling the ratio of the combined focal length of the first and second lenses to the combined focal lengths of the third, fourth, fifth, sixth, and seventh lenses within a reasonable range, the incident angle of the incident light can be controlled to reduce higher-order aberrations of the optical system, thereby improving the imaging quality of the optical system. Furthermore, when the above relationship is satisfied, the refraction angle of the principal ray from the image side of the seventh lens can be reduced, allowing the principal ray to enter the image sensor at a more appropriate angle, enhancing the matching of the principal ray incident angle between the lens and the image sensor, and improving the relative brightness of the optical lens, thereby achieving high-quality imaging.

[0087] Furthermore, the optical imaging system satisfies the following relationship: 0<|(SAG14-SAG13) / (SAG8-SAG7)|<1.2, wherein SAG7 is the distance from the maximum effective aperture of the object side of the fourth lens to the intersection of the object side of the fourth lens and the optical axis in the direction parallel to the optical axis, SAG8 is the distance from the maximum effective aperture of the image side of the fourth lens to the intersection of the image side of the fourth lens and the optical axis in the direction parallel to the optical axis, SAG13 is the distance from the maximum effective aperture of the object side of the seventh lens to the intersection of the object side of the seventh lens and the optical axis in the direction parallel to the optical axis, and SAG14 is the distance from the maximum effective aperture of the image side of the seventh lens to the intersection of the image side of the seventh lens and the optical axis in the direction parallel to the optical axis. By limiting the range of the sag ratio between the object side and image side of the fourth lens and the seventh lens, the shapes of the object side and image side of the fourth lens and the seventh lens can be constrained to correct the field curvature of the imaging optical lens, reduce the risk of ghost images, and thus improve the imaging quality of the optical lens. When the ratio is higher than the upper limit, the sagittal height of the image side of the seventh lens is too large, making the image side of the seventh lens too curved, which is not conducive to the manufacturing, molding and assembly of the seventh lens and easily leads to a decrease in the imaging quality of the optical lens.

[0088] Furthermore, the optical imaging system satisfies the following relationship: 1.2 < T12 / (SAG2+SAG3) < 3.4, 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, SAG2 is the distance parallel to the optical axis from the maximum effective clear aperture of the image side of the first lens to the intersection of the image side of the first lens and the optical axis, and SAG3 is the distance parallel to the optical axis from the maximum effective clear aperture of the object side of the second lens to the intersection of the object side of the second lens and the optical axis. By making the optical system satisfy the above relational expression, the size of the sagitta height of the image side of the first lens can be effectively controlled. In配合 the change of the distance on the optical axis from the image side of the first lens to the object side of the second lens, the total length of the optical system can be effectively reduced to meet the miniaturization requirement. At the same time, the limitation of the size of the sagitta height of the image side of the first lens is also beneficial to reducing the risk of ghost image generation. Below the lower limit of the relational expression, the sagitta height of the image side of the first lens is too large, which easily leads to serious deflection of marginal rays and is not conducive to reducing marginal aberration, thus reducing the imaging quality of the optical system; exceeding the upper limit of the relational expression, the distance on the optical axis from the image side of the first lens to the object side of the second lens increases, and the arrangement space between the remaining lenses decreases, resulting in an increase in the sensitivity of the spacer thickness of the optical system, which is not conducive to the assembly of the optical system.

[0089] Further, the optical imaging system satisfies the following relationship: 3.2 < DT32 / SAG7 < 6.2, where DT32 is the maximum effective radius of the image side of the third lens, and SAG7 is the distance parallel to the optical axis from the maximum effective clear 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 maximum effective radius of the image side of the third lens to the sagitta height at the maximum effective aperture, it is beneficial for the third lens to effectively receive the large-angle rays incident from the second lens and reduce the risk of marginal aberration. Below the lower limit of the relational expression, the sagitta height value of the image side of the third lens becomes larger, and the third lens is too curved, which easily leads to serious deflection of marginal rays and is not conducive to correcting the aberration of the optical system, thus reducing the imaging quality of the optical system and increasing the risk of marginal field curvature aberration; exceeding the upper limit of the relational expression, the maximum effective radius of the image side of the third lens increases, which is not conducive to limiting the range of incident rays, affects the imaging quality, and will also affect the aperture size of the image side of the second lens, which is not conducive to the processing of the optical system.

[0090] Furthermore, the following relationship is satisfied: 0.3 < (CT6 + CT7) / BFL < 1.7, where CT6 is the thickness of the sixth lens on the optical axis, CT7 is the thickness of the seventh lens on the optical axis, and BFL is the minimum distance between the image side surface of the seventh lens and the imaging plane of the optical system along the optical axis (also known as the back focal length). By limiting the scope of the above conditional expression, the back focal length of the optical system can be controlled within a reasonable range, thereby effectively ensuring the matching degree between the camera image and the image sensor, and ensuring the matching of the optical system with the image sensor. At the same time, controlling the thickness of the sixth and seventh lenses on the optical axis can effectively improve the compactness of the rear group structure, thereby reducing the total optical length of the optical system and further developing miniaturization. In addition, the molding and assembly of the combined lens of the sixth and seventh lenses reduces the production cost of the optical system and further reduces the decentering sensitivity of the optical system, which is beneficial to ensuring the imaging effect of the optical system.

[0091] Furthermore, the optical imaging system satisfies the following relationship: 0.5 < (R7 - R8) / R7 < 3.6, where R7 is the radius of curvature of the object-side surface of the fourth lens, and R8 is the radius of curvature of the image-side surface of the fourth lens. By limiting the ratio of the curvature radii of the object-side surface to the image-side surface of the fourth lens, the shape of the fourth lens can be effectively constrained, thereby effectively controlling the aberration contribution rates of the object-side and image-side surfaces of the fourth lens, effectively balancing the aberrations of the system related to the aperture zone, and thus effectively improving the imaging quality of the system.

[0092] Furthermore, the optical imaging system satisfies the following relationship: 0.3<(R13+R14) / |R13-R14|<3.8, wherein R13 is the radius of curvature of the object side of the seventh lens, and R14 is the radius of curvature of the image side of the seventh lens. By controlling the range of the above conditional expression, the shape of the seventh lens can be reasonably configured, which is beneficial to reducing the aberration generated by the seventh lens and improving the molding yield of the seventh lens. If the upper limit of the above conditional expression is exceeded, the radius of curvature of the object side of the seventh lens is too small, and light is easily reflected between the seventh lens and the fourth lens to produce ghosting, which is not conducive to improving the imaging quality. If the lower limit of the above conditional expression is lower than the lower limit of the above conditional expression, the absolute value of the radius of curvature of the image side of the seventh lens is too small, resulting in excessive curvature of the seventh lens, which is not conducive to the processing and molding of the seventh lens.

[0093] Further, the optical imaging system satisfies the following relationship: 2.6 < CT3 / |SAG5| < 6.0, where CT3 is the thickness of the third lens on the optical axis, and SAG5 is the distance parallel to the optical axis from the maximum effective clear aperture of the object side surface of the third lens to the intersection of the object side surface of the third lens and the optical axis. By defining the range of the above conditional formula, the ratio of the central thickness of the third lens to the sagitta of the object side surface can be reasonably configured, which is beneficial to the reasonable deflection of light when passing through the third lens, thereby improving the imaging quality of the system. At the same time, it is also beneficial to expand the aperture of the third lens, enabling light to exit from the third lens at a larger angle, which is conducive to increasing the imaging surface of the system and achieving a large image surface effect. Exceeding the upper limit of the above conditional formula, the sagitta of the object side surface of the third lens is too small, resulting in excessive deflection of marginal rays when passing through the third lens, thereby increasing the marginal aberration of the system and being unfavorable for improving the imaging quality. Below the lower limit of the above conditional formula, the central thickness of the third lens is too small, and the ratio of thickness to thinness at various parts of the third lens changes too much, which is not conducive to the reasonable deflection of light, reduces the MTF value of the system, and causes the resolution of the system to decline.

[0094] Specifically, as a preferred implementation manner of the present invention rather than a limitation, in Embodiment 1 and Embodiment 4, the second lens and the seventh lens are aspherical lenses, and the rest are spherical lenses, and they are all separated by an air gap. In Embodiment 2, the third lens and the seventh lens are aspherical lenses, and the rest are spherical lenses, and they are all separated by an air gap. In Embodiment 3, the sixth lens and the seventh lens are aspherical lenses, and the rest are spherical lenses, and they are all separated by an air gap; the F number of the optical imaging system is 1.4 to 1.6; the total optical length of the optical imaging system ≤ 21 mm. The embodiments of the present invention disclose a 2P5G optical system. By selecting 2 aspherical lenses and 5 spherical lenses and reasonably configuring the refractive power and surface type of each lens, the optical lens has the advantages of large clear aperture, small volume, good imaging quality, large field angle, 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, and improve the resolution and imaging clarity of the optical lens to meet the high-definition imaging requirements of people for vehicle-mounted optical lenses.

[0095] Embodiment 1

[0096] Specifically, as a preferred implementation manner of the present invention rather than a limitation, the following refers to Figures 1 to 2 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.

[0097] As Figure 1As shown, the optical imaging lens according to an exemplary embodiment of the present application includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, an STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an infrared filter E8 and an imaging surface S16.

[0098] 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 positive optical power, with its object-side surface S5 being concave and its image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has positive optical power, with its object-side surface S9 being 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 an object sequentially passes through surfaces S1 to S15 and is ultimately imaged on an imaging surface S16.

[0099] Table 1 shows the surface type, curvature radius, thickness, and material of each lens of the optical imaging lens system of Example 1, wherein the units of curvature radius and thickness are both millimeters (mm).

[0100] Table 1: Basic parameters of the optical imaging system in Example 1

[0101] Face number Surface type Curvature radius (mm) Thickness (mm) Material OBJ spherical surface endless endless S1 spherical surface 23.8015 0.8000 1.62,60.32 S2 spherical surface 3.2919 2.5147 S3 Q-type aspheric surface -38.0445 3.6671 1.66,20.38 S4 Q-type aspheric surface -22.0905 0.6780 S5 spherical surface -5.3144 2.0776 1.62,60.32 S6 spherical surface -5.5520 0.4752 STO spherical surface endless -0.3752 S7 spherical surface 8.5916 1.9486 1.60,61.60 S8 spherical surface -9.3677 0.1000 S9 spherical surface 7.1301 2.4036 1.62,60.43 S10 spherical surface -5.6375 0.5000 1.76,27.58 S11 spherical surface 6.4569 1.1048 S12 Q-type aspheric surface 20.3904 0.9217 1.54,55.77 S13 Q-type aspheric surface -9.4488 0.6405 S14 spherical surface endless 0.64 S15 spherical surface endless 2.9058 1.52,64.21 S16 spherical surface endless

[0102] In Table 1, both the object-side surface and the image-side surface of the second lens element E2 and the seventh lens element E7 are Q-type aspherical surfaces. The surface shape of each aspherical lens element can be defined by, but not limited to, the following aspherical surface formula:

[0103]

[0104] Where Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, r is the radial coordinate of the aspheric surface, c is the curvature of the vertex of the aspheric surface, K is the conic coefficient, Am is the aspheric coefficient, rmax is the maximum radial radius coordinate, and u = r / rmax. Table 2 shows the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 of various aspheric surfaces that can be used in the first embodiment.

[0105] Table 2: Aspheric surface related values ​​of the lens surface of Example 1

[0106] Surface number S3 S4 S12 S13 K -2.51E+01 -4.86E+01 2.12E+01 9.01E+00 A4 -8.12E-02 1.69E-01 -4.47E-01 -7.28E-02 A6 -3.14E-03 6.66E-02 -4.29E-02 9.81E-03 A8 -6.67E-04 3.54E-02 1.85E-03 1.99E-02 A10 1.09E-03 2.01E-02 3.33E-03 1.03E-02 A12 1.28E-03 8.65E-03 1.06E-03 4.76E-03 A14 1.07E-03 2.71E-03 2.66E-05 1.98E-03 A16 7.02E-04 7.33E-04 -1.53E-04 1.06E-03 A18 4.00E-04 2.07E-04 -1.92E-04 5.00E-04 A20 1.60E-04 -8.44E-05 -1.87E-04 2.66E-04 A22 2.35E-05 -3.00E-04 -1.30E-04 1.17E-04 A24 -4.54E-05 -3.11E-04 -8.74E-05 9.29E-05 A26 -5.72E-05 -1.70E-04 -7.54E-05 3.09E-05 A28 -3.90E-05 -2.52E-05 -5.32E-05 1.37E-06 A30 -1.31E-05 8.27E-06 -1.89E-05 -1.52E-05

[0107] Figure 2 The following plots show the axial chromatic aberration, astigmatism, and distortion of the optical imaging lens of Example 1. Axial chromatic aberration indicates the deviation of light of different wavelengths from the focal point after passing through the lens; astigmatism indicates meridional and sagittal image curvature; and distortion indicates the magnitude of distortion at different image heights. The optical imaging lens of Example 1 of this application can achieve excellent imaging quality.

[0108] Example 2

[0109] Specifically, as a preferred embodiment of the present invention but not limiting, the following reference is made to Figures 3 and 4 The optical imaging lens according to Example 2 of the present application is described. Figure 3 A schematic structural diagram of an optical imaging lens according to Example 2 of the present application is shown.

[0110] like Figure 3 As shown, the optical imaging lens according to an exemplary embodiment of the present application includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, an STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an infrared filter E8 and an imaging surface S16.

[0111] 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 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 negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being concave. The sixth lens E6 has positive optical power, with its object-side surface S10 being convex and its image-side surface S11 being convex. The seventh lens E7 has negative optical power, with its object-side surface S12 being convex and its image-side surface S13 being concave. The filter E8 has an object-side surface S14 and an image-side surface S15. Light from an object sequentially passes through surfaces S1 to S15 and is ultimately imaged on an imaging surface S16.

[0112] Table 3 shows the surface type, curvature radius, thickness, and material of each lens of the optical imaging lens system of Example 2, where the units of curvature radius and thickness are both millimeters (mm).

[0113] Table 3: Basic parameters of the optical imaging system of Example 2

[0114] Face number Surface type Curvature radius (mm) Thickness (mm) Material OBJ spherical surface endless endless S1 spherical surface 12.3477 0.8208 1.62,60.32 S2 spherical surface 2.8890 3.2325 S3 spherical surface -4.9086 2.8454 1.74,44.85 S4 spherical surface -6.0659 0.1000 S5 Q-type aspheric surface 26.6821 1.2942 1.64,23.53 S6 Q-type aspheric surface -46.0069 0.4444 STO spherical surface endless -0.3108 S7 spherical surface 8.0245 3.2604 1.60,61.61 S8 spherical surface -5.4571 0.2181 S9 spherical surface -38.5940 0.5000 1.75,27.58 S10 spherical surface 4.7265 3.9335 1.54,65.40 S11 spherical surface -5.3136 0.1993 S12 Q-type aspheric surface 17.5248 1.1570 1.64,23.53 S13 Q-type aspheric surface 6.4846 0.3311 S14 spherical surface endless 0.64 S15 spherical surface endless 2.3342 1.52,64.21 S16 spherical surface endless

[0115] In Table 1, both the object-side surface and the image-side surface of the third lens element E3 and the seventh lens element E7 are Q-type aspherical surfaces. The surface shape of each aspherical lens element can be defined by, but not limited to, the following aspherical surface formula:

[0116]

[0117] Where Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, r is the radial coordinate of the aspheric surface, c is the curvature of the vertex of the aspheric surface, K is the conic coefficient, Am is the aspheric coefficient, rmax is the maximum radial radius coordinate, and u = r / rmax. Table 4 shows the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 of various aspheric surfaces that can be used in the first embodiment.

[0118] Table 4: Aspheric surface related values ​​of the lens surface of Example 2

[0119] Surface number S5 S6 S12 S13 K -9.00E+01 -9.00E+01 -8.61E+00 -1.61E+01 A4 2.44E-01 3.07E-01 -3.87E-01 -2.91E-01 A6 -1.02E-03 2.15E-02 4.85E-03 6.64E-03 A8 -4.95E-03 6.70E-05 4.46E-04 2.85E-03 A10 3.51E-05 -1.79E-04 -1.84E-04 -8.92E-04 A12 8.21E-04 4.77E-04 1.05E-04 3.04E-04 A14 6.23E-04 3.79E-04 -5.66E-05 -1.23E-04 A16 1.81E-04 3.81E-04 2.44E-05 3.81E-05 A18 -9.37E-05 2.12E-04 -1.29E-05 -6.72E-06 A20 -2.70E-04 1.84E-04 3.63E-06 9.20E-07 A22 -3.10E-04 9.25E-05 7.67E-08 -9.37E-08 A24 -2.77E-04 6.65E-05 1.30E-07 -2.62E-08 A26 -1.61E-04 1.19E-05 -5.84E-08 1.93E-09 A28 -5.53E-05 5.88E-06 -3.75E-08 8.69E-10 A30 6.39E-06 -1.21E-05 1.00E-08 4.45E-11

[0120] Figure 4 The following plots show the axial chromatic aberration, astigmatism, and distortion of the optical imaging lens of Example 2. Axial chromatic aberration indicates the deviation of light of different wavelengths from the focal point after passing through the lens; astigmatism indicates meridional and sagittal image curvature; and distortion indicates the magnitude of distortion at different image heights. The optical imaging lens of Example 2 of this application can achieve excellent imaging quality.

[0121] Example 3:

[0122] Specifically, as a preferred embodiment of the present invention but not limiting, the following reference is made to Figures 5 and 6 The optical imaging lens according to Example 3 of the present application is described. Figure 5 A schematic structural diagram of an optical imaging lens according to Example 3 of the present application is shown.

[0123] like Figure 5 As shown, the optical imaging lens according to an exemplary embodiment of the present application includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, an STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an infrared filter E8 and an imaging surface S16.

[0124] 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 concave. The fifth lens E5 has negative 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 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 concave. The filter E8 has an object-side surface S14 and an image-side surface S15. Light from an object sequentially passes through surfaces S1 to S15 and is ultimately imaged on an imaging surface S16.

[0125] Table 5 shows the surface type, curvature radius, thickness, and material of each lens of the optical imaging lens system of Example 3, where the units of curvature radius and thickness are both millimeters (mm).

[0126] Table 5: Basic parameters of the optical imaging system of Example 3

[0127] Face number Surface type Curvature radius (mm) Thickness (mm) Material OBJ spherical surface endless endless S1 spherical surface 12.3608 0.7000 1.68,51.64 S2 spherical surface 3.0920 3.2476 S3 spherical surface -5.6350 4.1227 1.74,52.68 S4 spherical surface -7.7460 0.1000 S5 spherical surface 7.7394 1.4579 1.75,32.98 S6 spherical surface 36.1480 0.4299 STO spherical surface endless -0.1144 S7 spherical surface 6.3182 2.0596 1.95,17.94 S8 spherical surface 3.0698 2.3907 1.59,68.35 S9 spherical surface -8.8409 0.1122 S10 Q-type aspheric surface -20.7408 0.6701 1.58,42.19 S11 Q-type aspheric surface 6.5788 0.5680 S12 Q-type aspheric surface 3.1925 1.6181 1.50,81.61 S13 Q-type aspheric surface 21.1496 0.6616 S14 spherical surface endless 0.6 S15 spherical surface endless 2.2496 1.52,64.21 S16 spherical surface endless

[0128] In Table 5, both the object-side surface and the image-side surface of the sixth lens element E6 and the seventh lens element E7 are Q-type aspherical surfaces. The surface shape of each aspherical lens element can be defined by, but not limited to, the following aspherical surface formula:

[0129]

[0130] Where Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, r is the radial coordinate of the aspheric surface, c is the curvature of the vertex of the aspheric surface, K is the conic coefficient, Am is the aspheric coefficient, rmax is the maximum radial radius coordinate, and u = r / rmax. Table 6 shows the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 of various aspheric surfaces that can be used in the first embodiment.

[0131] Table 6: Aspheric surface related values ​​of the lens surface of Example 3

[0132] Surface number S10 S11 S12 S13 K 3.97E+01 -2.56E+01 -1.10E-01 3.84E+01 A4 -3.05E-01 -5.99E-01 -9.37E-01 9.97E-02 A6 9.82E-02 1.17E-01 4.55E-02 6.52E-03 A8 -1.15E-03 -2.92E-02 -2.20E-02 5.65E-03 A10 9.89E-03 1.02E-02 1.73E-03 -2.07E-03 A12 -1.38E-03 -5.90E-04 -1.85E-03 -3.27E-04 A14 -1.80E-03 2.01E-03 2.89E-04 -3.80E-04 A16 -2.73E-03 -7.50E-04 -1.60E-04 -4.41E-06 A18 -1.14E-03 -3.33E-04 3.27E-05 -1.77E-04 A20 -2.34E-04 -5.60E-04 -2.55E-05 -4.90E-05 A22 2.72E-04 -2.64E-04 3.77E-06 -9.63E-05 A24 2.57E-04 -1.46E-04 9.43E-07 -2.97E-05 A26 8.92E-05 -2.87E-05 4.49E-06 -4.60E-05 A28 -2.87E-05 -1.39E-05 -4.39E-06 -2.16E-05 A30 -2.56E-05 -8.20E-06 8.78E-07 -2.52E-05

[0133] Figure 6The following graphs show the axial chromatic aberration, astigmatism, and distortion curves for the optical imaging lens of Example 3. Axial chromatic aberration indicates the deviation of light of different wavelengths from the focal point after passing through the lens; astigmatism indicates meridional and sagittal image curvature; and distortion indicates the magnitude of distortion at different image heights. The optical imaging lens of Example 3 of this application can achieve excellent imaging quality.

[0134] Example 4:

[0135] Specifically, as a preferred embodiment of the present invention but not limiting, the following reference is made to Figures 7 and 8 An optical imaging lens according to Example 4 of the present application is described. Figure 7 A schematic structural diagram of an optical imaging lens according to Example 4 of the present application is shown.

[0136] like Figure 7 As shown, the optical imaging lens according to an exemplary embodiment of the present application includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, an STO, a third lens E3, 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.

[0137] 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 negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being concave. The sixth lens E6 has negative optical power, with its object-side surface S10 being convex and its image-side surface S11 being convex. The seventh lens E7 has positive optical power, with its object-side surface S12 being convex and its image-side surface S13 being concave. The filter E8 has an object-side surface S14 and an image-side surface S15. Light from an object sequentially passes through surfaces S1 to S15 and is ultimately imaged on an imaging surface S16.

[0138] Table 7 shows the surface type, curvature radius, thickness, and material of each lens of the optical imaging lens system of Example 4, where the units of curvature radius and thickness are both millimeters (mm).

[0139] Table 7: Basic parameters of the optical imaging system of Example 4

[0140] Face number Surface type Curvature radius (mm) Thickness (mm) Material OBJ spherical surface endless endless S1 spherical surface 15.4120 1.6766 1.83,42.73 S2 spherical surface 3.1427 5.1118 S3 Q-type aspheric surface -4.2932 0.8000 1.54,55.77 S4 Q-type aspheric surface -5.9065 0.4283 S5 spherical surface endless 0.1000 1.91,35.26 STO spherical surface 13.3488 1.7346 S6 spherical surface -1.04E+01 0.7719 S7 spherical surface 5.9655 2.5310 1.62,63.41 S8 spherical surface -15.4133 0.1387 S9 spherical surface -15.7738 0.5000 1.92,20.88 S10 spherical surface 4.1549 2.4697 1.62,63.41 S11 spherical surface -10.5689 0.2790 S12 Q-type aspheric surface 17.2623 1.4387 1.54,55.77 S13 Q-type aspheric surface 29.9311 0.8615 S14 spherical surface endless 0.64 S15 spherical surface endless 1.5183 1.52,64.21 S16 spherical surface endless

[0141] In Table 7, both the object-side surface and the image-side surface of the second lens element E2 and the seventh lens element E7 are Q-type aspherical surfaces. The surface shape of each aspherical lens element can be defined by, but not limited to, the following aspherical surface formula:

[0142]

[0143] Where Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, r is the radial coordinate of the aspheric surface, c is the curvature of the vertex of the aspheric surface, K is the conic coefficient, Am is the aspheric coefficient, rmax is the maximum radial radius coordinate, and u = r / rmax. Table 8 shows the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 of various aspheric surfaces that can be used in the first embodiment.

[0144] Table 8: Aspheric surface related values ​​of the lens surface of Example 4

[0145] Surface number S10 S11 S12 S13 K -3.10E+00 -1.01E+01 -9.80E+01 7.58E+01 A4 1.22E-01 1.12E-01 -9.36E-01 -7.62E-01 A6 3.05E-02 5.23E-02 -5.55E-02 2.60E-03 A8 1.88E-03 3.81E-03 2.39E-02 8.94E-03 A10 6.03E-04 2.35E-03 5.55E-03 -5.49E-03 A12 1.29E-04 2.57E-04 -8.32E-04 -7.16E-04 A14 -7.45E-05 -2.95E-04 -2.34E-03 -1.14E-04 A16 -1.02E-04 -1.19E-04 -1.36E-03 3.73E-04 A18 -4.22E-05 -1.82E-04 -2.93E-04 -6.55E-04 A20 2.40E-05 -2.77E-04 5.58E-04 -9.42E-04 A22 3.12E-05 -4.81E-04 9.21E-04 -1.18E-03 A24 3.48E-05 -4.33E-04 8.97E-04 -8.31E-04 A26 2.14E-05 -3.20E-04 6.20E-04 -5.05E-04 A28 2.05E-05 -1.39E-04 2.87E-04 -1.63E-04 A30 1.18E-05 -5.86E-05 7.50E-05 -5.15E-05

[0146] Figure 8 The following plots show the axial chromatic aberration, astigmatism, and distortion of the optical imaging lens of Example 4. Axial chromatic aberration indicates the deviation of light of different wavelengths from the focal point after passing through the lens; astigmatism represents meridional and sagittal image curvature; and distortion indicates the magnitude of distortion at different image heights. This lens achieves excellent imaging quality.

[0147] In Examples 1-4, the basic data are shown in Table 9 below:

[0148] Table 9 Basic data of Examples 1-4

[0149] Basic data / Example 1 2 3 4 f1(mm) -6.23 -6.26 -6.27 -5.02 f2(mm) 72.17 660.84 -166.70 -35.39 f3(mm) 84.62 26.32 12.75 6.62 f4(mm) 7.80 5.96 30.57 7.26 f5(mm) 26.97 -23.24 -25.54 -11.95 f6(mm) -6.95 14.75 -8.56 -101.17 f7(mm) 12.12 -16.61 7.32 73.00 f(mm) 3.40 3.39 3.31 3.20 TTL(mm) 21.00 21.00 21.00 21.00 HFOV(°) 63.78 65.82 66.52 65.56 f / EPD 1.50 1.40 1.60 1.50

[0150] In Examples 1-4, the conditional formula is shown in Table 10 below:

[0151] Table 10 Conditional formula for Examples 1-4

[0152] Conditional formula / Example 1 2 3 4 CT3 2.08 1.29 1.46 1.73 CT6 0.50 3.93 0.67 2.47 CT7 0.92 1.16 1.62 1.44 BFL 4.19 3.15 3.24 3.00 R7 8.59 8.02 6.32 5.97 R8 -9.37 -5.46 3.07 -15.41 R13 20.39 17.52 3.19 17.26 R14 -9.45 6.48 21.15 29.93 FOV 127.56 131.65 133.04 131.12 Iamg 3.69 3.80 3.80 3.80 f123 -11.16 -23.29 20.01 7.92 f345 7.63 10.37 6.01 7.97 f4567 6.38 6.70 8.60 11.81 SAG2 2.14 2.24 2.31 2.09 SAG3 -0.17 -0.84 -0.83 -0.56 SAG5 -0.68 0.31 0.56 0.29 SAG7 0.47 0.52 0.52 0.91 SAG8 -0.47 -0.99 1.06 -0.29 SAG13 -0.23 -0.46 1.01 -0.31 SAG14 -0.75 0.01 0.42 -0.23 T12 2.51 3.23 3.25 5.11 DT11 5.17 5.04 5.11 5.55 DT32 2.88 2.72 2.58 2.96 FOV / (TTL / IamgH / DT11) 115.73 120.05 123.00 131.79 f5 / (f5+f6) 1.35 2.74 0.75 0.11 f345 / f 2.25 3.06 1.82 2.49 |(SAG14-SAG13) / (SAG8-SAG7)| 0.55 0.32 1.11 0.07 T12 / (SAG2+SAG3) 1.28 2.32 2.19 3.33 DT32 / SAG7 6.15 5.25 4.93 3.23 (CT6+CT7) / BFL 0.34 1.62 0.71 1.30 (R7-R8) / R7 2.09 1.68 0.51 3.58 |f123| / f4567 1.75 3.48 2.33 0.67 (R13+R14) / |R13-R14| 0.37 2.17 1.36 3.73 CT3 / |SAG5| 3.06 4.11 2.61 5.96

[0153] A camera module includes at least an optical lens, in which an optical imaging system is installed. The optical imaging system is composed of seven lenses. By selecting an appropriate number of lenses and rationally configuring the refractive power and surface shape of each lens, the optical lens has the advantages of large light throughput, small size, good imaging quality, and a large field of view. At the same time, it can also better capture object detail information, improve the optical lens's ability to capture details of the photographed object, improve the image quality of the optical lens, and enhance the resolution and imaging clarity of the optical lens to meet people's requirements for high-definition imaging of vehicle-mounted optical lenses.

[0154] The above descriptions are provided in conjunction with specific content to provide one or more embodiments, and the specific implementation of the present invention is not limited to these descriptions. Any similarity or similarity with the methods, structures, etc. of the present invention, or any technical deduction or substitution based on the concept of the present invention, shall be considered within the scope of protection of the present invention.

Claims

1. An optical imaging system, comprising, in order 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, its object side surface is convex, and its image side surface is concave; The second lens has optical power, its object side surface is concave, and its image side surface is convex; The third lens has positive optical power; The fourth lens has positive refractive power and its object side surface is convex; The fifth lens has optical power; The sixth lens has optical power; The seventh lens has optical power, and its object side surface is convex; The optical imaging system satisfies the following relationship: 1.4 ≤ f / EPD ≤ 1.6; 110°mm < FOV / (TTL / ImgH / DT11) < 140°mm; 0 < f5 / (f5+f6) < 2.8; 1.8 < f345 / f < 3.1; Wherein, f is the effective focal length of the optical imaging system, EPD is the entrance pupil diameter of the optical imaging lens, FOV is the maximum field of view of the optical imaging system, DT11 is the maximum effective radius of the object side of the first lens, TTL is the on-axis distance from the object side of the first lens to the imaging surface, ImgH is half the diagonal length of the effective pixel area on the imaging surface, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, f345 is the effective combined focal length of the third lens, fourth lens, and fifth lens, and f is the effective focal length of the optical imaging system.

2. An optical imaging system according to claim 1, characterized in that: The optical imaging system satisfies the following relationship: 0.6 < |f123| / f4567 < 3.5; Wherein, f123 is the effective combined focal length of the first lens, the second lens and the third lens, and f4567 is the effective combined focal length of the fourth lens, the fifth lens, the sixth lens and the seventh lens.

3. An optical imaging system according to any one of claims 1-2, characterized in that: The optical imaging system satisfies the following relationship: 0 < |(SAG14-SAG13) / (SAG8-SAG7)| < 1.2; 1.2 < T12 / (SAG2+SAG3) < 3.4; 3.2 < DT32 / SAG7 < 6.2; Among them, SAG2 is the distance from the maximum effective aperture of the image side of the first lens to the intersection of the image side of the first lens and the optical axis in the direction parallel to the optical axis, SAG3 is the distance from the maximum effective aperture of the object side of the second lens to the intersection of the object side of the second lens and the optical axis in the direction parallel to the optical axis, SAG7 is the distance from the maximum effective aperture of the image side of the third lens to the intersection of the image side of the third lens and the optical axis in the direction parallel to the optical axis, SAG8 is the distance from the maximum effective aperture of the image side of the fourth lens to the intersection of the image side of the fourth lens and the optical axis in the direction parallel to the optical axis, SAG13 is the distance from the maximum effective aperture of the object side of the seventh lens to the intersection of the object side of the seventh lens and the optical axis in the direction parallel to the optical axis, SAG14 is the distance from the maximum effective aperture of the image side of the seventh lens to the intersection of the image side of the seventh lens and the optical axis in the direction parallel to the optical axis, T12 is the distance from the image side of the first lens to the object side of the second lens on the optical axis, and DT32 is the maximum effective radius of the image side of the third lens.

4. An optical imaging system according to any one of claims 1-2, characterized in that: The optical imaging system satisfies the following relationship: 0.3 < (CT6+CT7) / BFL < 1.7; 2.6 < CT3 / |SAG5| < 6.0; Among them, CT3 is the thickness of the third lens on the optical axis, CT6 is the thickness of the sixth lens on the optical axis, CT7 is the thickness of the seventh lens on the optical axis, BFL is the minimum distance from the image side surface of the seventh lens to the imaging surface of the optical system in the optical axis direction, and SAG5 is the distance from the maximum effective aperture of the object side surface of the third lens to the intersection of the object side surface of the third lens and the optical axis in the direction parallel to the optical axis.

5. An optical imaging system according to any one of claims 1-2, characterized in that: The optical imaging system satisfies the following relationship: 0.5 < (R7-R8) / R7 < 3.6; 0.3 < (R13+R14) / |R13-R14| < 3.8; Among them, R7 is the curvature radius of the object side of the fourth lens, R8 is the curvature radius of the image side of the fourth lens, R13 is the curvature radius of the object side of the seventh lens, and R14 is the curvature radius of the image side of the seventh lens.

6. An optical imaging system according to any one of claims 1-2, characterized in that: The F number of the optical imaging system is 1.4 to 1.6; the total optical length of the optical imaging system is ≤21 mm.

7. An optical imaging system according to any one of claims 1-2, characterized in that: The seventh lens is an aspherical lens, one of the second lens, the third lens and the sixth lens is an aspherical lens, and the remaining lenses are spherical lenses.

8. A camera module, comprising at least an optical lens, characterized in that: An optical imaging system according to any one of claims 1 to 7 is installed in the optical lens.

Images