Wide-angle, high-pixel vehicle-mounted optical system and camera module using same

Abstract

The application provides a wide-angle, high-pixel vehicle-mounted optical system and a camera module using the same. 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 hybrid optical system of spherical surfaces and aspherical surfaces is used, and the advantages of wide angle, high definition, excellent temperature characteristics and super high pixel are considered at the same time, so that the optical system has great potential in the vehicle-mounted field.

Description

Technical Field

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

[0002] With the increasing popularity of optical systems, people are demanding not only high-definition image clarity and miniaturization, but also a wide field of view to capture more light information. Currently used optical systems have low pixel counts and a narrow field of view. To achieve high pixel counts while increasing the field of view and the user's visible range, this feature is crucial for user safety and will enhance market competitiveness. Summary of the Invention

[0003] In order to overcome the common shortcomings of existing automotive optical lenses, such as low pixels and small field of view, the present application provides an optical system with wide angle, high-definition resolution, excellent temperature characteristics, and ultra-high pixels, and a camera module applied thereto. It uses a hybrid optical system of spherical and aspherical surfaces, and takes into account the characteristics of wide angle, high-definition resolution, excellent temperature characteristics, and ultra-high pixels, and has huge potential in the market.

[0004] A wide-angle, high-pixel 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, and is characterized by:

[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 optical power and its object side surface is convex;

[0008] The fourth lens has positive refractive power, its object-side surface is convex, and its image-side surface is flat;

[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 wide-angle, high-pixel vehicle-mounted optical system as described above satisfies the following relationship: 0.20

[0013] <f / TTL*ImgH<3.50;

[0014] 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.

[0015] The wide-angle, high-pixel vehicle-mounted optical system described above satisfies the following conditions:

[0016] -12.0mm<f1<-2.5mm;

[0017] -25.0mm<f2<-9.5mm;

[0018] 8.0mm<f3<20.0mm;

[0019] 11.0mm<f4<23.0mm;

[0020] 1.5mm<f5<8.0mm;

[0021] -15.0mm<f6<-2.0mm;

[0022] 6.5mm<f56<20.5mm;

[0023] 18.0mm<f7<30.0mm;

[0024] 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, 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.

[0025] The wide-angle, high-pixel vehicle-mounted optical system described above satisfies the following conditions:

[0026] -3.5<f1 / f<-0.5;

[0027] -8.0<f2 / f<-2.5;

[0028] 4.0<f3 / f<9.0;

[0029] 3.0<f4 / f<12.0;

[0030] 1.2<f5 / f<5.0;

[0031] -5.5<f6 / f<-0.5;

[0032] 2.1<f56 / f<7.6;

[0033] 4.0<f7 / f<15.0;

[0034] 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, 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.

[0035] In the wide-angle, high-pixel vehicle-mounted optical system described above, the curvature radius R31 of the object-side surface and the curvature radius R32 of the image-side surface of the third lens satisfy: |R31 / R32|≥0.50.

[0036] In the wide-angle, high-pixel 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 value f of the optical lens satisfies: TTL / f≤8.

[0037] In the wide-angle, high-pixel 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;

[0038] 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;

[0039] 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;

[0040] 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;

[0041] 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;

[0042] 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;

[0043] 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.

[0044] As described above, the wide-angle, high-pixel vehicle-mounted optical system has a full field of view (FOV) that satisfies the following conditions: 140°<FOV<180°.

[0045] In the wide-angle, high-pixel vehicle-mounted optical system as described above, the fifth lens and the sixth lens form a cemented lens.

[0046] In the wide-angle, high-pixel vehicle-mounted optical system 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|≥0.20.

[0047] On the other hand, an embodiment of the present application also provides a camera module, which includes at least an optical lens, in which the above-mentioned wide-angle, high-pixel vehicle-mounted optical system is installed.

[0048] Compared with the prior art, the present invention has the following advantages:

[0049] The wide-angle, high-pixel vehicle-mounted optical system and the camera module used therein of the embodiments of the present invention are 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. By rationally allocating the surface shape and optical power of each lens and using a hybrid optical system of spherical and aspherical surfaces, the system simultaneously combines the advantages of wide angle, high-definition resolution, excellent temperature characteristics, and ultra-high pixels, and has great potential in the vehicle-mounted field. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] 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.

[0051] Figure 1 Schematic diagram of the structure of the optical system or camera module of Example 1 of the present application;

[0052] Figure 2 is a relative illumination curve of the optical system or camera module of Example 1 of the present application;

[0053] Figure 3 is the astigmatism and distortion curve of the optical system or camera module of Example 1 of the present application;

[0054] Figure 4 is the on-axis chromatic aberration curve of the optical system or camera module in Example 1 of the present application;

[0055] Figure 5 2 is a schematic structural diagram of an optical system or camera module according to embodiment 2 of the present application;

[0056] Figure 6 is a relative illumination curve of the optical system or camera module of Example 2 of the present application;

[0057] Figure 7 is the astigmatism and distortion curve of the optical system or camera module of Example 2 of the present application;

[0058] Figure 8 is the on-axis chromatic aberration curve of the optical system or camera module of Embodiment 2 of the present application. DETAILED DESCRIPTION

[0059] As shown in Figure 1-8 The present application provides a wide-angle, high-pixel vehicle-mounted optical system and a camera module applied thereto. The optical system 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.

[0060] The first lens E1 has a negative focal power, and its object side surface is a convex surface, and its image side surface is a concave surface.

[0061] The second lens E2 has a negative focal power, and its object side surface is a concave surface, and its image side surface is a convex surface.

[0062] The third lens E3 has a positive focal power, and its object side surface is a convex surface.

[0063] The fourth lens E4 has a positive focal power, and its object side surface is a convex surface, and its image side surface is a plane.

[0064] The fifth lens E5 has a positive focal power, and its object side surface is a convex surface, and its image side surface is a convex surface.

[0065] The sixth lens E6 has a negative focal power, and its object side surface is a concave surface.

[0066] The seventh lens E7 has a positive focal power, and its object side surface is a convex surface, and its image side surface is a convex surface.

[0067] The fifth lens E5 and the sixth lens E6 form a cemented lens.

[0068] The present application provides a wide-angle, high-pixel vehicle-mounted optical system and a camera module applied thereto. 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. Through reasonable distribution of the surface shape and focal power of each lens, a hybrid optical system of spherical surface and aspherical surface is used, and the advantages of wide angle, high resolution, excellent temperature characteristics, and ultra-high pixel are considered at the same time, which has great potential in the vehicle-mounted field.

[0069] Furthermore, the optical system satisfies the following relationship: 0.20 < f / TTL*ImgH < 3.50; 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 optical lens can meet the requirements for thinness while still meeting the requirements.

[0070] Furthermore, the optical system satisfies the following conditions: -12.0 mm < f1 < -2.5 mm; -25.0 mm < f2 < -9.5 mm; 8.0 mm < f3 < 20.0 mm; 11.0 mm < f4 < 23.0 mm; 1.5 mm < f5 < 8.0 mm; -15.0 mm < f6 < -2.0 mm; 6.5 mm < f56 < 20.5 mm; 18.0 mm < f7 < 30.0 mm; wherein 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 formed by the fifth lens E5 and the sixth lens E6, and f7 is the focal length of the seventh lens E7. By rationally distributing the focal length of each lens, it has the advantages of high resolution, reducing the volume while taking into account the advantages of high viewing angle clarity.

[0071] Furthermore, the optical system satisfies the following conditions:

[0072] -3.5<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;

[0073] -8.0<f2 / f<-2.5, 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;

[0074] 4.0<f3 / f<9.0, 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;

[0075] 3.0<f4 / f<12.0, 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;

[0076] 1.2<f5 / f<5.0, by constraining the ratio of the fifth lens's E5 focal power to the effective focal length of the optical system to a reasonable range, improving image quality;

[0077] -5.5<f6 / f<-0.5, by constraining the effective focal length ratio of the sixth lens E6 to the optical system within a reasonable range, lens aberrations are optimized and analytical performance is improved;

[0078] 2.1<f56 / f<7.6. 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, balancing the internal aberrations of the optical lens. This helps 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.

[0079] 4.0<f7 / f<15.0, by constraining the effective focal length ratio of the seventh lens element 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;

[0080] 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.

[0081] Furthermore, the curvature radius R31 of the object side surface and the curvature radius R32 of the image side surface of the third lens satisfy: |R31 / R32|≥0.50, which is conducive to increasing the rear aperture and increasing the light throughput of the system.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] Furthermore, the full field of view FOV of the optical system satisfies: 140°<FOV<180°. This design satisfies the large field of view of the lens. The optical system configured in the present invention has the advantages of wide angle, 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.

[0091] 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 more compact. Fourth, it reduces the sensitivity to tolerances such as tilt and deflection generated during the assembly process of the lens unit.

[0092] Furthermore, the curvature radius R61 of the object-side surface and the curvature radius R62 of the image-side surface of the sixth lens satisfy the following relationship: |R61 / R62|≥0.20. 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.

[0093] Example 1:

[0094] 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, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8 and an imaging surface S16 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 element E1 to the imaging surface S16, and half the horizontal length of the effective pixel area on the imaging surface ImgH satisfy the following relationship: f / TTL*ImgH=0.607. The curvature radius R31 of the object-side surface S5 of the third lens element E2 and the curvature radius R32 of the image-side surface S6 satisfy the following relationship: |R31 / R32|=0.62. The distance TTL on 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 the focal length f of the optical lens satisfy the following relationship: TTL / f=7.62. The curvature radius R61 of the object-side surface S10 of the sixth lens element E6 and the curvature radius R62 of the image-side surface S11 satisfy the following relationship: |R61 / R62|=0.30.

[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. The fourth lens E4 has positive power, with its object-side surface S7 being convex and its image-side surface S8 being flat. The fifth lens E5 has positive power, with its object-side surface S9 being convex and its image-side surface S10 being convex. The sixth lens E6 has negative power, with its object-side surface S10 being concave. The seventh lens E7 has positive power, with its object-side surface S13 being convex and its image-side surface S14 being convex. The fifth lens E5 and the sixth lens E6 are a cemented lens. The filter E8 has an object-side surface S14 and an image-side surface S15. Light from the object sequentially passes through surfaces S1 to S15 and is ultimately imaged on the imaging surface S16.

[0097] [4] Table 1 shows the surface type, curvature radius, thickness and material of each lens of the optical system of Example 1, where the units of curvature radius and thickness are both millimeters (mm).

[0098] Table 1: Basic parameters of the optical system of Example 1

[0099] Face number Surface type Curvature radius (mm) Thickness (mm) Material OBJ spherical surface endless endless S1 spherical surface 19.318 1.30 1.91,35.25 S2 spherical surface 4.540 4.90 S3 Aspheric -5.230 3.95 1.81,50.00 S4 Aspheric -10.016 0.08 S5 spherical surface 9.170 3.00 1.85,23.75 S6 spherical surface 14.770 0.12 S7 STOP Infinity 0.08 S8 spherical surface 10.570 2.75 1.62,63.40 STO spherical surface Infinity 0.04 S10 spherical surface 9.065 5.50 1.62,63.40 S11 spherical surface -4.710 0.68 2.00,19.30 S12 spherical surface -15.663 1.00 S13 Aspheric 33.988 1.17 1.81,50.00 S14 Aspheric -35.745 3.00 S15 spherical surface Infinity 0.80 1.52,64.20 S16 spherical surface Infinity 2.13 S17 spherical surface Infinity

[0100] 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:

[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 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 Example 1.

[0103] Table 2: Aspheric surface related values ​​of the lens surface of Example 1

[0104] Surface number 3 4 13 14 K -1.30E+00 -1.50E+00 1.54E+01 6.70E+01 A4 4.40E-05 2.47E-04 -1.60E-03 -7.35E-04 A6 4.40E-06 5.60E-06 -7.35E-06 6.77E-06 A8 2.10E-07 -8.00E-08 1.40E-06 5.20E-07 A10 -1.50E-08 2.97E-09 -2.97E-09 1.14E-07 A12 0 0 1.88E-09 2.23E-09 A14 0 0 8.79E-10 -1.30E-10 A16 0 0 -4.34E-11 5.60E-12

[0105] 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.

[0106] Figure 3The 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.

[0107] 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.

[0108] Example 2:

[0109] 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 5 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, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8 and an imaging surface S16 in sequence from the object plane to the image plane along the optical axis.

[0110] The effective focal length f of the optical system, the on-axis distance TTL between the object-side surface S1 of the first lens element E1 and the imaging surface S16, and half the horizontal length of the effective pixel area on the imaging surface ImgH satisfy the following relationship: f / TTL*ImgH=0.616. The curvature radius R31 of the object-side surface S5 of the third lens element E2 and the curvature radius R32 of the image-side surface S6 satisfy the following relationship: |R31 / R32|=0.53. The distance TTL on 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 the focal length f of the optical lens satisfy the following relationship: TTL / f=7.51. The curvature radius R61 of the object-side surface S10 of the sixth lens element E6 and the curvature radius R62 of the image-side surface S11 satisfy the following relationship: |R61 / R62|=0.29.

[0111] 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. The fourth lens E4 has positive power, with its object-side surface S7 being convex and its image-side surface S8 being flat. The fifth lens E5 has positive power, with its object-side surface S9 being convex and its image-side surface S10 being convex. The sixth lens E6 has negative power, with its object-side surface S10 being concave. The seventh lens E7 has positive power, with its object-side surface S13 being convex and its image-side surface S14 being convex. The fifth lens E5 and the sixth lens E6 are a cemented lens. The filter E8 has an object-side surface S14 and an image-side surface S15. Light from the object sequentially passes through surfaces S1 to S15 and is ultimately imaged on the imaging surface S16.

[0112] 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).

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

[0114]

[0115]

[0116] 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:

[0117]

[0118] 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 Example 2.

[0119] Table 4: Aspheric surface related values ​​of the lens surface of Example 2

[0120] Surface number 3 4 13 14 K -9.00E-01 -1.85E+00 -2.62E+01 -1.02E+02 A4 4.50E-04 2.70E-04 -1.40E-03 -7.05E-04 A6 5.50E-06 6.15E-06 -8.50E-06 2.30E-05 A8 -7.60E-08 -1.10E-07 1.14E-06 -1.85E-06 A10 -6.70E-09 4.14E-09 9.17E-08 2.65E-07 A12 0 0 -1.06E-08 -1.30E-09 A14 0 0 1.33E-09 -4.02E-10 A16 0 0 -4.50E-11 1.80E-11

[0121] Figure 6 The relative illumination curve of the optical system 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.

[0122] Figure 7The astigmatism and distortion curves of the optical system of Example 2 are shown. Astigmatism represents meridional image curvature and sagittal image curvature; distortion represents the distortion magnitude corresponding to different image heights.

[0123] Figure 8 The axial chromatic aberration curve of the optical system 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 system provided in the embodiment can achieve good imaging quality and realize high-performance design.

[0124] A camera module includes at least an optical lens, in which the above-mentioned wide-angle, high-pixel 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, it 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.

[0125] 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 wide-angle, high-pixel automotive 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 refractive power, its object-side surface is convex, and its image-side surface is flat; 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: 0.20mm<f / TTL*ImgH<3.50mm; 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: -12.0mm<f1<-2.5mm; -25.0mm<f2<-9.5mm; 8.0mm<f3<20.0mm; 11.0mm<f4<23.0mm; 1.5mm<f5<8.0mm; -15.0mm<f6<-2.0mm; 6.5mm<f56<20.5mm; 18.0mm<f7<30.0mm; 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, 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 wide-angle, high-pixel vehicle-mounted optical system according to claim 1, characterized in that: The optical system meets the following conditions: -3.5<f1 / f<-0.5; -8.0<f2 / f<-2.5; 4.0<f3 / f<9.0; 3.0<f4 / f<12.0; 1.2<f5 / f<5.0; -5.5<f6 / f<-0.5; 2.1<f56 / f<7.6; 4.0<f7 / f<15.0; 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, 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.

3. The wide-angle, high-pixel vehicle-mounted optical system according to any one of claims 1-2, characterized in that: A curvature radius R31 on the object-side surface and a curvature radius R32 on the image-side surface of the third lens satisfy: |R31 / R32|≥0.

50.

4. The wide-angle, high-pixel 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.

5. The wide-angle, high-pixel 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.

6. The wide-angle, high-pixel 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°<FOV<180°.

7. The wide-angle, high-pixel vehicle-mounted optical system according to any one of claims 1-2, characterized in that: The fifth lens and the sixth lens form a cemented lens.

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

20.

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

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