A large-aperture vehicle-mounted optical system and a camera module using the same

Abstract

The application provides a large-aperture vehicle-mounted optical system and an application camera module thereof. The optical system is sequentially composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. Through reasonable distribution of the surface shape and optical power of each lens, a mixed optical system of spherical surfaces and aspherical surfaces is used, and the advantages of large aperture, high resolution, excellent temperature characteristics and super high pixels are considered, so that the optical system has great potential in the field of vehicle-mounted optical lenses.

Description

Technical Field

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

[0002] In recent years, automotive driver-assistance systems have rapidly developed, and automotive optical lenses, acting as the eyes through which vehicles acquire external information, have played an irreplaceable role. To meet higher image quality requirements and achieve a wider visual range, a well-balanced lens system and a larger aperture are required. However, most existing lenses on the market suffer from shortcomings such as small apertures, low resolution, and low pixel count. Summary of the Invention

[0003] In order to overcome the common shortcomings of existing automotive optical lenses such as small aperture, low resolution and low pixels, the present application provides an optical system with large aperture, high-definition resolution, excellent temperature characteristics and ultra-high pixels, and a camera module applied thereto. It takes into account the characteristics of large aperture, high-definition resolution, excellent temperature characteristics and ultra-high pixels, and has great potential in the automotive field.

[0004] A large aperture vehicle-mounted optical 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 from the object plane to the image plane along the optical axis;

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

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

[0007] The third lens has positive refractive power, its object-side surface is convex, and its image-side surface is concave;

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

[0009] The fifth lens has positive refractive power, its object-side surface is convex, and its image-side surface is convex;

[0010] The sixth lens has negative optical power and its object-side surface is concave;

[0011] The seventh lens has positive refractive power, its object-side surface is convex, and its image-side surface is convex.

[0012] The large aperture vehicle-mounted optical system as described above satisfies the following relationship: 0.50<f / TTL*ImgH<2.50;

[0013] Wherein, f is the effective focal length of the optical system, TTL is the distance from the center of the object side of the first lens to the imaging surface of the optical lens on the optical axis, and ImgH is half the horizontal length of the effective pixel area on the imaging surface.

[0014] The large aperture vehicle-mounted optical system as described above satisfies the following conditions:

[0015] -8.0mm<f1<-4.0mm; -45.0mm<f2<-30.0mm; 20.0mm<f3<40.0mm; 10.0mm<f4<25.0mm; 10.0mm<f 34<20.0mm; 1.0mm<f5<10.0mm; -15.0mm<f6<-2.0mm; 5.0mm<f56<20.0mm; 10.0mm<f7<25.0mm;

[0016] Among them, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f34 is the focal length of the cemented lens composed of the third and fourth lenses, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, f56 is the focal length of the cemented lens composed of the fifth and sixth lenses, and f7 is the focal length of the seventh lens.

[0017] The large aperture vehicle-mounted optical system as described above satisfies the following conditions:

[0018] -2.5<f1 / f<-0.5; -10.0<f2 / f<-3.5; 2.0<f3 / f<15.0; 3.0<f4 / f<9.0; 2.5<f34 / f<12.0;0.5<f5 / f<6.0;-2.0<f6 / f<0.5;-5.0<f56 / f<-1.0;-3.0<f7 / f<-0.1;

[0019] Wherein, f is the effective focal length of the optical system, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f34 is the focal length of the cemented lens consisting of the third and fourth lenses, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, f56 is the focal length of the cemented lens consisting of the fifth and sixth lenses, and f7 is the focal length of the seventh lens.

[0020] In the large aperture vehicle-mounted optical system described above, the distance from the center of the object side surface of the first lens to the imaging surface of the optical lens on the optical axis is TTL, and the focal length f of the optical lens satisfies: TTL / f≤8.

[0021] In the large aperture vehicle-mounted optical system described above, the material refractive index Nd1 and the material Abbe number constant Vd1 of the first lens satisfy the following conditions: 1.63<Nd1<2.01, 25.00<Vd1<61.00;

[0022] The material refractive index Nd2 and the material Abbe number Vd2 of the second lens satisfy the following conditions: 1.49<Nd2<2.01, 20.00<Vd2<82.00;

[0023] The material refractive index Nd3 and the material Abbe number Vd3 of the third lens satisfy the following conditions: 1.60<Nd3<1.97, 17.00<Vd3<55.00;

[0024] The material refractive index Nd4 and the material Abbe number Vd4 of the fourth lens satisfy the following conditions: 1.40<Nd4<1.66, 50.00<Vd4<95.00;

[0025] The refractive index Nd5 and Abbe number Vd5 of the material of the fifth lens satisfy the following conditions: 1.40<Nd5<1.66, 50.00<Vd5<95.00;

[0026] The refractive index Nd6 and Abbe number Vd6 of the sixth lens element satisfy the following conditions: 1.65<Nd6<2.05, 15.00<Vd6<35.00;

[0027] The material refractive index Nd7 and the material Abbe number Vd7 of the seventh lens satisfy: 1.49<Nd7<2.01, 20.00<Vd7<82.00.

[0028] For the large aperture vehicle-mounted optical system as described above, the full field of view (FOV) of the optical system satisfies the following conditions: 140.00°<FOV<180.00°.

[0029] In the large aperture vehicle-mounted optical system as described above, the curvature radius R61 of the object-side surface and the curvature radius R62 of the image-side surface of the sixth lens satisfy: |R61 / R62|≥0.15.

[0030] In the large aperture vehicle-mounted optical system as described above, the third lens and the fourth lens form a cemented lens, and the fifth lens and the sixth lens form a cemented lens.

[0031] The large aperture vehicle-mounted optical system as described above further includes an aperture stop disposed between the fourth lens and the fifth lens.

[0032] On the other hand, an embodiment of the present application also provides a camera module, which includes at least an optical lens, and the above-mentioned large aperture vehicle-mounted optical system is installed in the optical lens.

[0033] Compared with the prior art, the application has the following beneficial effects:

[0034] The large-aperture vehicle-mounted optical system and the camera module applied thereto of the embodiment of the application are 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, and the advantages of large aperture, high resolution, excellent temperature characteristics and super high pixels are achieved by reasonably distributing the surface shape and optical power of each lens and using a mixed optical system of spherical surface and aspherical surface. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed to be used in the embodiment description will be briefly introduced.

[0036] Figure 1 is a structural schematic diagram of the optical system or the camera module of the embodiment 1 of the application;

[0037] Figure 2 is a relative luminance curve of the optical system or the camera module of the embodiment 1 of the application;

[0038] Figure 3 is an astigmatism and distortion curve of the optical system or the camera module of the embodiment 1 of the application;

[0039] Figure 4 is an on-axis chromatic aberration curve of the optical system or the camera module of the embodiment 1 of the application;

[0040] Figure 5 is a structural schematic diagram of the optical system or the camera module of the embodiment 2 of the application;

[0041] Figure 6 is a relative luminance curve of the optical system or the camera module of the embodiment 2 of the application;

[0042] Figure 7 is an astigmatism and distortion curve of the optical system or the camera module of the embodiment 2 of the application;

[0043] Figure 8 is an on-axis chromatic aberration curve of the optical system or the camera module of the embodiment 2 of the application. DETAILED DESCRIPTION

[0044] As shown in Figure 1-8 , the application provides a large-aperture vehicle-mounted optical system, which is composed of a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6 and a seventh lens E7 in sequence along an optical axis from an object plane to an image plane;

[0045] The first lens E1 has negative refractive power, its object-side surface is convex, and its image-side surface is concave;

[0046] The second lens E2 has negative refractive power, its object-side surface is concave, and its image-side surface is convex;

[0047] The third lens E3 has positive refractive power, its object-side surface is convex, and its image-side surface is concave;

[0048] The fourth lens element E4 has positive refractive power and a convex object-side surface.

[0049] The fifth lens element E5 has positive refractive power, its object-side surface is convex, and its image-side surface is convex;

[0050] The sixth lens element E6 has negative optical power and its object-side surface is concave.

[0051] The seventh lens E7 has positive refractive power, its object-side surface is convex, and its image-side surface is convex.

[0052] An embodiment of the present invention provides a large aperture vehicle-mounted optical system, comprising, in sequence, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. By rationally allocating the surface shape and optical power of each lens, and utilizing a hybrid optical system comprising spherical and aspherical surfaces, the system simultaneously achieves advantages such as a large aperture, high-definition resolution, excellent temperature characteristics, and ultra-high pixel count, demonstrating enormous potential in the field of vehicle-mounted optical lenses.

[0053] Furthermore, the optical system satisfies the following relationship: 0.50 < f / TTL * ImgH < 2.50; where f is the effective focal length of the optical system, TTL is the distance along the optical axis from the center of the object-side surface S1 of the first lens element E1 to the imaging surface S16 of the optical lens, and ImgH is half the horizontal 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. When this relationship is satisfied, the requirement for thinness can be achieved while still meeting the requirements of the optical lens.

[0054] Furthermore, the optical system satisfies the following conditions: -8.0 mm < f1 < -4.0 mm; -45.0 mm < f2 < -30.0 mm; 20.0 mm < f3 < 40.0 mm; 10.0 mm < f4 < 25.0 mm; 10.0 mm < f34 < 20.0 mm; 1.0 mm < f5 < 10.0 mm; -15.0 mm < f6 < -2.0 mm; 5.0 mm < f56 < 20.0 mm; 10.0 mm m<f7<25.0mm; where f1 is the focal length of the first lens element E1, f2 is the focal length of the second lens element E2, f3 is the focal length of the third lens element E3, f4 is the focal length of the fourth lens element E4, f34 is the focal length of the cemented lens formed by the third and fourth lenses E3 and E4, f5 is the focal length of the fifth lens element E5, f6 is the focal length of the sixth lens element E6, f56 is the focal length of the cemented lens formed by the fifth and sixth lenses E5 and E6, and f7 is the focal length of the seventh lens element E7. By rationally allocating the focal lengths of the various lens elements, the lens achieves the advantages of high resolution, large aperture, high viewing angle clarity, and high pixel count.

[0055] Furthermore, the optical system satisfies the following conditions:

[0056] -2.5<f1 / f<-0.5, by constraining the effective focal length ratio of the first lens E1 and the optical system to a reasonable range, the distortion of the system is controlled, and the imaging center has a higher angular resolution;

[0057] -10.0<f2 / f<-3.5, by constraining the effective focal length ratio of the second lens E2 to the optical system within a reasonable range, lens aberrations are optimized and imaging quality is improved;

[0058] 2.0<f3 / f<15.0, by constraining the effective focal length ratio of the third lens E3 to the optical system within a reasonable range, the spherical aberration of the system is fine-tuned and controlled, thereby effectively improving the imaging quality of the system;

[0059] 3.0<f4 / f<9.0, by reasonably controlling the ratio range of the fourth lens E4 and the effective focal length of the optical system, the imaging quality of the system is effectively improved;

[0060] 2.5<f34 / f<12.0. By constraining the ratio of the combined focal length of the third lens element E3 and the fourth lens element E4 to the effective focal length of the optical lens, the focal powers of the third lens element E3 and the fourth lens element E4 can be properly distributed, thereby balancing the internal aberrations of the optical lens. This helps to adjust the field curvature and astigmatism at the imaging edge of the optical lens, thereby meeting the imaging quality of the optical lens for the surrounding environment.

[0061] 0.5<f5 / f<6.0, by constraining the ratio of the fifth lens E5 optical power to the effective focal length of the optical system to a reasonable range, improving image quality;

[0062] -2.0<f6 / f<0.5, by constraining the effective focal length ratio of the sixth lens E6 and the optical system to a reasonable range, lens aberrations are optimized and analytical performance is improved;

[0063] -5.0<f56 / f<-1.0. By constraining the ratio of the combined focal length of the fifth lens element E5 and the sixth lens element E6 to the effective focal length of the optical lens, the optical powers of the fifth lens element E5 and the sixth lens element E6 can be properly distributed, thereby balancing the internal aberrations of the optical lens, thereby helping to adjust the field curvature and astigmatism at the imaging edge of the optical lens, and meeting the imaging quality of the optical lens for the surrounding environment.

[0064] -3.0<f7 / f<-0.1, by constraining the effective focal length ratio of the seventh lens E7 to the optical system within a reasonable range, it can ensure good optical performance, optimize lens aberrations, improve resolution performance, and further ensure the viewing angle;

[0065] Wherein, f is the effective focal length of the optical system, f1 is the focal length of the first lens E1, f2 is the focal length of the second lens E2, f3 is the focal length of the third lens E3, f4 is the focal length of the fourth lens E4, f5 is the focal length of the fifth lens E5, f6 is the focal length of the sixth lens E6, f56 is the focal length of the cemented lens consisting of the fifth lens E5 and the sixth lens E6, and f7 is the focal length of the seventh lens E7.

[0066] Furthermore, the distance TTL on the optical axis from the center of the object-side surface S1 of the first lens E1 to the imaging surface S16 of the optical lens satisfies the following relationship: TTL / f≤8, which can effectively compress the size of the system and achieve a wide-angle characteristic.

[0067] Furthermore, the material refractive index Nd1 and the material Abbe number constant Vd1 of the first lens element E1 satisfy the following conditions: 1.63<Nd1<2.01, 25.00<Vd1<61.00. This design can effectively improve distortion, optimize lens aberrations, and thus effectively enhance the imaging quality of the system.

[0068] The material refractive index Nd2 and the material Abbe number constant Vd2 of the second lens E2 satisfy the following requirements: 1.49<Nd2<2.01, 20.00<Vd2<82.00. This design can effectively improve distortion and optimize lens aberrations, thereby effectively improving the imaging quality of the system.

[0069] The refractive index Nd3 and Abbe number Vd3 of the third lens element E3 satisfy the following conditions: 1.60<Nd3<1.97, 17.00<Vd3<55.00. This design can effectively improve distortion, ensure good optical performance, further ensure the viewing angle, and enhance the resolving power of the lens.

[0070] The refractive index Nd4 and Abbe number Vd4 of the fourth lens element E4 satisfy the following conditions: 1.40 < Nd4 < 1.66, 50.00 < Vd4 < 95.00. This design can effectively improve distortion, ensure good optical performance, further preserve the viewing angle, and enhance the resolving power of the lens.

[0071] The refractive index Nd5 and Abbe number Vd5 of the fifth lens element E5 satisfy the following conditions: 1.40 < Nd5 < 1.66, 50.00 < Vd5 < 95.00. This design effectively improves distortion and field curvature, ensuring excellent optical performance, further preserving the viewing angle, and enhancing the lens's resolving power.

[0072] The refractive index Nd6 and Abbe number Vd6 of the sixth lens element E6 satisfy the following conditions: 1.65<Nd6<2.05, 15.00<Vd6<35.00. This design can effectively improve distortion and field curvature, optimize lens aberrations, and thus effectively enhance the imaging quality of the system.

[0073] The material refractive index Nd7 and material Abbe number Vd7 of the seventh lens element E7 satisfy the following conditions: 1.49<Nd7<2.01, 20.00<Vd7<82.00. This design can effectively improve astigmatism and optimize lens aberrations, thereby effectively enhancing the imaging quality of the system.

[0074] Furthermore, the full field of view FOV of the optical system satisfies: 140.00°<FOV<180.00°. This design satisfies the large field of view of the lens. The optical system configured in the present invention has the advantages of large aperture, high-definition resolution, excellent temperature characteristics, and ultra-high pixels. It has a compact structure, is easy to process and install, and has good imaging resolution.

[0075] Furthermore, the third lens element E3 and the fourth lens element E4 form a cemented lens. First, it helps to eliminate the influence of chromatic aberration, reduce field curvature, and correct coma. Second, it eliminates the residual chromatic aberration to balance the overall chromatic aberration of the optical system. Third, it omits the air space between the two lenses, making the optical system compact as a whole and meeting the system compactness requirement. Fourth, it reduces the sensitivity to tolerances such as tilt and deflection generated during the assembly process of the lens unit.

[0076] Furthermore, the fifth lens element E5 and the sixth lens element E6 form a cemented lens. First, it helps to eliminate the influence of chromatic aberration, reduce field curvature, and correct coma. Second, it eliminates the residual chromatic aberration to balance the overall chromatic aberration of the optical system. Third, it omits the air space between the two lenses, making the optical system compact as a whole and meeting the system compactness requirement. Fourth, it reduces the sensitivity to tolerances such as tilt / eccentricity generated during the assembly process of the lens unit.

[0077] Furthermore, the curvature radius R61 of the object-side surface S9 of the sixth lens E6 and the curvature radius R62 of the image-side surface S10 satisfy the following relationship: |R61 / R62|≥0.15. By controlling the curvature radii of the object-side surface and the image-side surface of the sixth lens, the total deflection angle of the object-side surface and the image-side surface of the sixth lens at the edge of the field of view can be reasonably controlled within a reasonable range, which can effectively reduce the sensitivity of the system and improve the resolving power of the lens.

[0078] Example 1:

[0079] Specifically, as a preferred embodiment of the present invention but not limiting, the following reference is made to Figures 1 to 4 Describe the optical system of Example 1 of the present application, such as Figure 1 As shown, the optical system according to an exemplary embodiment of the present application is composed of a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, an aperture STO, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8 and an imaging surface S15 in sequence from the object plane to the image plane along the optical axis.

[0080] The effective focal length f of the optical system, the on-axis distance TTL from the object-side surface S1 of the first lens E1 to the imaging surface S15, and half the horizontal length of the effective pixel area on the imaging surface ImgH satisfy the following relationship: f / TTL*ImgH=0.612; the distance TTL from the center of the object-side surface S1 of the first lens E1 to the imaging surface S15 of the optical lens on the optical axis and the focal length f of the optical lens satisfy the following relationship: TTL / f=7.6; the curvature radius R61 of the object-side surface S9 of the sixth lens E6 and the curvature radius R62 of the image-side surface S10 satisfy the following relationship: |R61 / R62|=0.27.

[0081] The first lens E1 has negative power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative power, with its object-side surface S3 being concave and its image-side surface S4 being convex. The third lens E3 has positive power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive power, with its object-side surface S6 being convex. The fifth lens E5 has positive power, with its object-side surface S8 being convex and its image-side surface S9 being convex. The sixth lens E6 has negative power, with its object-side surface S9 being concave. The seventh lens E7 has positive power, with its object-side surface S11 being convex and its image-side surface S12 being convex. The third lens E3 and the fourth lens E4 are a cemented lens, while the fifth lens E5 and the sixth lens E6 are a cemented lens. The optical filter E8 has an object-side surface S13 and an image-side surface S14. Light from an object passes through the surfaces S1 to S14 in sequence and is finally imaged on the imaging surface S15 .

[0082] Table 1 shows the surface type, curvature radius, thickness, and material of each lens of the optical imaging system of Example 1, wherein the units of the curvature radius and thickness are both millimeters (mm).

[0083] Table 1: Basic parameters of the optical system of Example 1

[0084] Face number Surface type Curvature radius (mm) Thickness (mm) Material OBJ spherical surface endless endless S1 spherical surface 20.084 1.19 1.91,35.30 S2 spherical surface 4.453 4.96 S3 Aspheric -5.305 3.60 1.81,40.97 S4 Aspheric -8.605 0.22 S5 spherical surface 9.183 4.95 1.85,23.79 S6 spherical surface 11.843 1.73 1.62,63.40 S7 spherical surface 479.693 0.02 STO spherical surface Infinity 0.13 S9 spherical surface 7.132 4.55 1.60,65.46 S10 spherical surface -5.869 0.54 2.00,19.32 S11 spherical surface -25.188 1.00 S12 Aspheric 27.068 1.50 1.81,40.97 S13 Aspheric -32.015 3.00 S14 spherical surface Infinity 0.80 1.52,64.20 S15 spherical surface Infinity 2.20 S16 spherical surface Infinity

[0085] In Table 1, both the object side and the image side of the second lens E2 and the seventh lens E7 are aspherical surfaces. The surface shape of each aspherical lens can be defined by, but not limited to, the following aspherical surface formula:

[0086]

[0087] Where x is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the aspheric vertex, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th higher-order term in the aspheric surface shape formula. Table 2 shows the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 for various aspheric surfaces that can be used in the embodiments.

[0088] Table 2: Aspheric surface related values ​​of the lens surface of Example 1

[0089] Surface number 3 4 12 13 K -1.30E+00 -2.00E-01 3.31E+01 -1.60E-01 A4 -2.40E-04 2.30E-04 -1.65E-03 -5.06E-04 A6 3.20E-06 4.35E-06 -3.00E-05 -2.50E-05 A8 7.70E-07 -9.56E-08 2.80E-06 3.70E-06 A10 -4.50E-08 9.35E-10 -3.40E-07 -1.50E-07 A12 0 0 -1.30E-08 -1.63E-08 A14 0 0 1.40E-09 2.60E-09 A16 0 0 -7.00E-11 -8.00E-11

[0090] Figure 2 The relative illumination curve of the optical system of Example 1 is shown, which represents the ratio of the illumination at different coordinate points on the image plane to the illumination at the center point.

[0091] Figure 3 The astigmatism and distortion curves of the optical system of Example 1 are shown. Astigmatism represents meridional image curvature and sagittal image curvature; distortion represents the distortion magnitude corresponding to different image heights.

[0092] Figure 4 The axial chromatic aberration curve of the optical system of Example 1 is shown, which indicates that the light of different wavelengths deviates from the focal point after passing through the lens. Figures 1 to 4 It can be seen that the optical system provided in Example 1 can achieve good imaging quality and realize a high-performance design.

[0093] Example 2:

[0094] Specifically, as a preferred embodiment of the present invention but not limiting, the following reference is made to Figures 5 to 8 Describe the optical system of Example 2 of the present application, such as Figure 5As shown, the optical system according to an exemplary embodiment of the present application is composed of a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8 and an imaging surface S15 in sequence from the object plane to the image plane along the optical axis.

[0095] The effective focal length f of the optical system, the on-axis distance TTL from the object-side surface S1 of the first lens E1 to the imaging surface S15, and half the horizontal length of the effective pixel area on the imaging surface ImgH satisfy the following relationship: f / TTL*ImgH=0.605; the distance TTL from the center of the object-side surface S1 of the first lens E1 to the imaging surface S15 of the optical lens on the optical axis and the focal length f of the optical lens satisfy the following relationship: TTL / f=8.0; the curvature radius R61 of the object-side surface S9 of the sixth lens E6 and the curvature radius R62 of the image-side surface S10 satisfy the following relationship: |R61 / R62|=0.23.

[0096] The first lens E1 has negative power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative power, with its object-side surface S3 being concave and its image-side surface S4 being convex. The third lens E3 has positive power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive power, with its object-side surface S6 being convex. The fifth lens E5 has positive power, with its object-side surface S8 being convex and its image-side surface S9 being convex. The sixth lens E6 has negative power, with its object-side surface S9 being concave. The seventh lens E7 has positive power, with its object-side surface S11 being convex and its image-side surface S12 being convex. The third lens E3 and the fourth lens E4 are a cemented lens, while the fifth lens E5 and the sixth lens E6 are a cemented lens. The optical filter E8 has an object-side surface S13 and an image-side surface S14. Light from an object passes through the surfaces S1 to S14 in sequence and is finally imaged on the imaging surface S15 .

[0097] Table 3 shows the surface type, curvature radius, thickness, and material of each lens of the optical system of Example 2, wherein the units of the curvature radius and thickness are both millimeters (mm).

[0098] Table 3: Basic parameters of the optical system of Example 2

[0099] Face number Surface type Curvature radius (mm) Thickness (mm) Material OBJ spherical surface endless endless S1 spherical surface 20.512 1.25 1.91,35.30 S2 spherical surface 4.413 4.73 S3 Aspheric -5.308 3.60 1.81,40.97 S4 Aspheric -8.573 0.22 S5 spherical surface 9.183 4.95 1.85,23.79 S6 spherical surface 11.625 2.20 1.62,63.40 S7 spherical surface Infinity 0.02 STO spherical surface Infinity 0.13 S9 spherical surface 7.075 4.47 1.60,65.46 S10 spherical surface -5.825 0.70 2.00,19.32 S11 spherical surface -25.378 0.98 S12 Aspheric 26.148 1.47 1.81,40.97 S13 Aspheric -32.037 2.50 S14 spherical surface Infinity 0.80 1.52,64.20 S15 spherical surface Infinity 2.65 S16 spherical surface Infinity

[0100] In Table 3, both the object side and the image side of the second lens E2 and the seventh lens E7 are aspherical surfaces. The surface shape of each aspherical lens can be defined by, but not limited to, the following aspherical surface formula:

[0101]

[0102] Where x is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the aspheric vertex, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th higher-order term in the aspheric surface shape formula. Table 4 shows the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 for various aspheric surfaces that can be used in the embodiments.

[0103] Table 4: Aspheric surface related values ​​of the lens surface of Example 2

[0104] Surface number 3 4 12 13 K -1.30E+00 -2.00E-01 3.65E+01 -2.00E-02 A4 -2.40E-04 2.30E-04 -1.70E-03 -5.10E-04 A6 3.10E-06 4.90E-06 -3.36E-05 -3.20E-05 A8 1.30E-07 -1.30E-07 3.20E-06 4.40E-06 A10 -1.85E-08 2.05E-09 -2.80E-07 -9.83E-08 A12 0 0 -1.46E-08 -1.63E-08 A14 0 0 1.10E-09 2.49E-09 A16 0 0 -7.40E-11 -8.20E-11

[0105] Figure 6 The relative illumination curve of the optical imaging lens of Example 2 is shown, which represents the ratio of the illumination at different coordinate points on the image plane to the illumination at the center point.

[0106] Figure 7 The astigmatism and distortion curves of the optical imaging lens of Example 2 are shown. Astigmatism represents meridional image curvature and sagittal image curvature; distortion represents the distortion magnitude corresponding to different image heights.

[0107] Figure 8 The axial chromatic aberration curve of the optical imaging lens of Example 2 is shown, which indicates that the light of different wavelengths deviates from the focal point after passing through the lens. Figures 5 to 8 It can be seen that the optical imaging lens provided in Example 2 can achieve good imaging quality and realize a high-performance design.

[0108] A camera module includes at least an optical lens, in which the above-mentioned large aperture vehicle-mounted optical system is installed. The optical system 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. By rationally allocating the surface shape and optical focal length of each lens and using a hybrid optical system of spherical and aspherical surfaces, the system takes into account the advantages of large aperture, high-definition resolution, excellent temperature characteristics, and ultra-high pixels. It has great potential in the field of vehicle-mounted optical lenses.

[0109] 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. A large aperture vehicle-mounted optical 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 negative optical power, its object side surface is concave, and its image side surface is convex; The third lens has positive refractive power, its object-side surface is convex, and its image-side surface is concave; The fourth lens has positive optical power and its object-side surface is convex; The fifth lens has positive refractive power, its object-side surface is convex, and its image-side surface is convex; The sixth lens has negative optical power, its object-side surface is concave, and its image-side surface is convex; The seventh lens has positive refractive power, its object-side surface is convex, and its image-side surface is convex; The optical system satisfies the following relationship: 0.50mm<f / TTL*ImgH<2.50mm; Where f is the effective focal length of the optical system, TTL is the distance from the center of the object side of the first lens to the imaging plane of the optical lens on the optical axis, and ImgH is half the horizontal length of the effective pixel area on the imaging plane; The optical system meets the following conditions: -8.0mm<f1<-4.0mm; -45.0mm<f2<-30.0mm; 20.0mm<f3<40.0mm; 10.0mm<f4<25.0mm; 10.0mm<f34<20.0mm; 1.0mm<f5<10.0mm; -15.0mm<f6<-2.0mm; 5.0mm<f56<20.0mm; 10.0mm<f7<25.0mm; Among them, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f34 is the focal length of the cemented lens composed of the third and fourth lenses, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, f56 is the focal length of the cemented lens composed of the fifth and sixth lenses, and f7 is the focal length of the seventh lens.

2. The large aperture vehicle-mounted optical system according to claim 1, characterized in that: The optical system meets the following conditions: -2.5<f1 / f<-0.5; -10.0<f2 / f<-3.5; 2.0<f3 / f<15.0; 3.0<f4 / f<9.0; 2.5<f34 / f<12.0; 0.5<f5 / f<6.0; -2.0<f6 / f<0.5; Wherein, f is the effective focal length of the optical system, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f34 is the focal length of the cemented lens composed of the third and fourth lenses, f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens.

3. The large aperture vehicle-mounted optical system according to any one of claims 1-2, characterized in that: The distance between the center of the object-side surface of the first lens and the imaging surface of the optical lens on the optical axis is TTL, and the focal length f of the optical lens satisfies: TTL / f≤8.

4. The large aperture vehicle-mounted optical system according to any one of claims 1-2, characterized in that: The material refractive index Nd1 and the material Abbe number Vd1 of the first lens satisfy the following conditions: 1.63<Nd1<2.01, 25.00<Vd1<61.00; The material refractive index Nd2 and the material Abbe number Vd2 of the second lens satisfy the following conditions: 1.49<Nd2<2.01, 20.00<Vd2<82.00; The material refractive index Nd3 and the material Abbe number Vd3 of the third lens satisfy the following conditions: 1.60<Nd3<1.97, 17.00<Vd3<55.00; The material refractive index Nd4 and the material Abbe number Vd4 of the fourth lens satisfy the following conditions: 1.40<Nd4<1.66, 50.00<Vd4<95.00; The refractive index Nd5 and Abbe number Vd5 of the material of the fifth lens satisfy the following conditions: 1.40<Nd5<1.66, 50.00<Vd5<95.00; The refractive index Nd6 and Abbe number Vd6 of the sixth lens element satisfy the following conditions: 1.65<Nd6<2.05, 15.00<Vd6<35.00; The material refractive index Nd7 and the material Abbe number Vd7 of the seventh lens satisfy: 1.49<Nd7<2.01, 20.00<Vd7<82.

00.

5. The large aperture vehicle-mounted optical system according to any one of claims 1-2, characterized in that: The full field of view FOV of the optical system satisfies: 140.00°<FOV<180.00°.

6. The large aperture vehicle-mounted optical system according to any one of claims 1-2, characterized in that: A curvature radius R61 of the object-side surface and a curvature radius R62 of the image-side surface of the sixth lens satisfy: |R61 / R62|≥0.

15.

7. The large aperture vehicle-mounted optical system according to any one of claims 1-2, characterized in that: The third lens and the fourth lens form a cemented lens, and the fifth lens and the sixth lens form a cemented lens.

8. The large aperture vehicle-mounted optical system according to any one of claims 1-2, characterized in that: The optical system further includes a stop disposed between the fourth lens and the fifth lens.

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

Images