A high-pixel, large-surface panoramic fisheye optical system and its applied camera module

Abstract

The present invention provides a high-pixel, large-target-area panoramic fisheye optical system and a camera module applied thereto. The optical system is mainly composed of eight lenses. By selecting an appropriate number of lenses and rationally configuring the optical focal length and surface shape of each lens, it has the advantages of low cost, high pixel, and ultra-wide-angle design. The system has a compact structure and is easy to process and install, further improving the imaging effect of the system equipment and effectively meeting the design requirements of ultra-wide-angle and miniaturization of the optical system.

Description

Technical Field

[0001] The present application relates to the field of optical imaging, and in particular to a high-pixel, large-target panoramic fisheye optical system and a camera module used therein. Background Art

[0002] In recent years, as the scope of panoramic VR / AR applications has gradually expanded, the actual application scenarios of fisheye lenses have shown a more diversified trend, and consumers have increasingly higher requirements for the resolution of lenses. Existing lenses on the market generally have defects such as low pixels, small aperture, large size, and low image clarity. This type of lens design has become difficult to adapt to the gradually increasing usage needs of photography enthusiasts. Summary of the Invention

[0003] In order to overcome the common technical problems of existing fisheye lenses such as low pixels, small aperture, large size and low imaging clarity, the present application provides a high-pixel, large-target panoramic fisheye optical system. The optical system is mainly composed of 8 lenses. By selecting an appropriate number of lenses and reasonably configuring the optical focal length and surface shape of each lens, it has the advantages of low cost, high pixels and ultra-wide angle design. It has a compact structure and is easy to process and install, which further improves the imaging effect of the equipment equipped with the system.

[0004] A high-pixel, large-area panoramic fisheye optical system, which is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth 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 and its image side surface is concave;

[0007] The third lens has negative optical power and its object side surface is concave;

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

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

[0010] The sixth lens has positive refractive power, and its object-side surface is convex, and its image-side surface is convex;

[0011] The seventh lens has negative optical power, and its object-side surface and image-side surface are concave;

[0012] The eighth lens has positive refractive power, its object-side surface is convex, and its image-side surface is concave.

[0013] Preferably, the optical system meets the following conditions:

[0014] -10.0mm<f1<-5.0mm;

[0015] -15.5mm<f2<-7.5mm;

[0016] -8.5mm<f3<-5.0mm;

[0017] 2.9mm<f4<6.5mm;

[0018] 4.0mm<f5<8.0mm;

[0019] 2.0mm<f6<3.5mm;

[0020] -3.0mm<f7<-1.5mm;

[0021] 10.0mm<f8<50mm;

[0022] Among them, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, f7 is the effective focal length of the seventh lens, and f8 is the effective focal length of the eighth lens.

[0023] Preferably, the optical system meets the following conditions:

[0024] -5.5<f1 / f<-2.1;

[0025] -8.3<f2 / f<-3.2;

[0026] -4.6<f3 / f<-2.2;

[0027] 1.3<f4 / f<3.5;

[0028] 1.8<f5 / f<4.3;

[0029] 0.9<f6 / f<1.9;

[0030] -1.6<f7 / f<-0.7;

[0031] 4.6<f8 / f<26.5;

[0032] Wherein, f is the focal length of the entire optical system, wherein f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, f7 is the effective focal length of the seventh lens, and f8 is the effective focal length of the eighth lens.

[0033] Preferably, the full field of view FOV∈[180°, 220°] of the optical system, and the total length TTL of the optical system ≤18 mm.

[0034] Preferably, the optical system satisfies the following relationship: D1 / (Fno*Ymax)<2.8;

[0035] Wherein, D1 is the maximum effective diameter of the first lens, Fno is the system aperture, and Ymax is the maximum image circle radius of the system.

[0036] Preferably, the optical system meets the following conditions:

[0037] 2.7<|R1 / R2|<3.7;

[0038] 0.5<|R7 / R8|<1.3;

[0039] Wherein R1 is the object side curvature of the first lens, R2 is the image side curvature of the first lens, R7 is the object side curvature of the fourth lens, and R8 is the image side curvature of the fourth lens.

[0040] Preferably, the optical system meets the following conditions:

[0041] 0.35<f1 / f2<1.28;

[0042] Wherein, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens.

[0043] Preferably, the optical system satisfies the following conditions: -1.40<f6 / f7<-0.80; 2.10<Vd6 / Vd7<2.90;

[0044] Wherein, f6 is the effective focal length of the sixth lens, f7 is the effective focal length of the seventh lens, Vd6 is the Abbe number of the sixth lens, and Vd7 is the Abbe number of the seventh lens.

[0045] Preferably, the refractive index Nd1 of the material of the first lens is greater than 1.7.

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

[0047] The aperture of the optical system is located between the fifth lens and the sixth lens;

[0048] The sixth lens and the seventh lens form a cemented lens, and the remaining lenses are separated by air.

[0049] On the other hand, an embodiment of the present application further provides a camera module, comprising at least an optical lens, wherein the optical lens is installed with the above-mentioned high-pixel, large-target-area panoramic fisheye optical system.

[0050] Compared with the prior art, the present invention has the following advantages:

[0051] The present invention provides a high-pixel, large-target-area panoramic fisheye optical system and a camera module applied thereto. The optical system is mainly composed of eight lenses. By selecting an appropriate number of lenses and rationally configuring the optical focal length and surface shape of each lens, it has the advantages of low cost, high pixel, and ultra-wide-angle design. The system has a compact structure and is easy to process and install, further improving the imaging effect of the system equipment and effectively meeting the design requirements of ultra-wide-angle and miniaturization of the optical system. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] 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.

[0053] Figure 1 Schematic diagram of the structure of the optical system or camera module of Example 1 of the present application;

[0054] Figure 2 are the field curvature curve and distortion curve of the optical system or camera module in Example 1 of the present application;

[0055] Figure 3 2 is a schematic structural diagram of an optical system or camera module according to embodiment 2 of the present application;

[0056] Figure 4 are the field curvature curve and distortion curve of the optical system or camera module of Example 2 of the present application;

[0057] Figure 5 2 is a schematic structural diagram of the optical system or camera module according to Embodiment 3 of the present application;

[0058] Figure 6 These are the field curvature curve and distortion curve of the optical system or camera module in Example 3 of the present application. DETAILED DESCRIPTION

[0059] like Figure 1-6 As shown, the present application provides a high-pixel, large-surface panoramic fisheye 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, a seventh lens E7, and an eighth lens E8 in order from the object plane to the image plane along the optical axis;

[0060] The first lens E1 has negative refractive power, its object-side surface is convex, and its image-side surface is concave;

[0061] The second lens E2 has negative refractive power, and its image side surface is concave;

[0062] The third lens E3 has negative optical power, and its object side surface is concave;

[0063] The fourth lens E4 has positive refractive power, and its object-side surface is convex, and its image-side surface is convex;

[0064] The fifth lens E5 has positive refractive power, and its object-side surface is convex, and its image-side surface is convex;

[0065] The sixth lens E6 has positive refractive power, and its object-side surface is convex, and its image-side surface is convex;

[0066] The seventh lens E7 has negative refractive power, and its object-side surface and image-side surface are concave;

[0067] The eighth lens E8 has positive refractive power, its object-side surface is convex, and its image-side surface is concave.

[0068] The optical system of the embodiment of the present application is mainly composed of 8 lenses. By selecting an appropriate number of lenses and reasonably configuring the optical focal length and surface shape of each lens, it has the advantages of low cost, high pixel, and ultra-wide angle design. It has a compact structure and is easy to process and install, further improving the imaging effect of the system equipment and effectively meeting the design requirements of ultra-wide angle and miniaturization of the optical system.

[0069] Furthermore, the optical system satisfies the following conditions: -10.0 mm < f1 < -5.0 mm; -15.5 mm < f2 < -7.5 mm; -8.5 mm < f3 < -5.0 mm; 2.9 mm < f4 < 6.5 mm; 4.0 mm < f5 < 8.0 mm; 2.0 mm < f6 < 3.5 mm; -3.0 mm < f7 < -1.5 mm; 10.0 mm < f8 < 50 mm; wherein f1 is the effective focal length of the first lens element E1, and f2 is the effective focal length of the second lens element E1. The effective focal length of lens E2 is shown in Figure 1, f3 is the effective focal length of the third lens element E3, f4 is the effective focal length of the fourth lens element E4, f5 is the effective focal length of the fifth lens element E5, f6 is the effective focal length of the sixth lens element E6, f7 is the effective focal length of the seventh lens element E7, and f8 is the effective focal length of the eighth lens element E8. Reasonable control of the effective focal length of each lens in the optical system can enable the optical system to meet a large field of view while limiting the effective diameter of components, controlling the size of the overall optical system, and adjusting the incident angle of light, which is beneficial to correcting system aberrations.

[0070] Furthermore, the optical system satisfies the following conditions: -5.5<f1 / f<-2.1; -8.3<f2 / f<-3.2; -4.6<f3 / f<-2.2; 1.3<f4 / f<3.5; 1.8<f5 / f<4.3; 0.9<f6 / f<1.9; -1.6<f7 / f<-0.7; 4.6<f8 / f<26.5; wherein f is the focal length of the entire optical system, f1 is the effective focal length of the first lens E1, and f2 is the effective focal length of the second lens E2. Focal length, f3 is the effective focal length of the third lens element E3, f4 is the effective focal length of the fourth lens element E4, f5 is the effective focal length of the fifth lens element E5, f6 is the effective focal length of the sixth lens element E6, f7 is the effective focal length of the seventh lens element E7, and f8 is the effective focal length of the eighth lens element E8. The effective focal length of each lens element is limited by the ratio of the effective focal length of the optical system, so that the optical system can obtain a reasonable light deflection angle, effectively reduce the sensitivity to component tolerances, and improve system aberrations, which can meet the gradually increasing usage needs of photography enthusiasts.

[0071] Furthermore, the full field of view FOV∈[180°,220°] of the optical system, and the total length TTL of the optical system ≤18mm, effectively meet the actual demand for ultra-wide angle of the optical system through the design of the optical system with a large field of view.

[0072] Furthermore, the optical system satisfies the following relationship: D1 / (Fno*Ymax)<2.8; wherein D1 is the maximum effective diameter of the first lens E1, Fno is the system aperture, and Ymax is the maximum image circle radius of the system. By limiting the maximum image circle and aperture size of the optical imaging system, the purpose of limiting the optical effective diameter of the first lens can be achieved, thereby ensuring the requirement for miniaturization of the optical system.

[0073] Preferably, the optical system satisfies the following conditions: 2.7<|R1 / R2|<3.7; 0.5<|R7 / R8|<1.3; wherein R1 is the object-side curvature of the first lens element E1, R2 is the image-side curvature of the first lens element E1, R7 is the object-side curvature of the fourth lens element E4, and R8 is the image-side curvature of the fourth lens element E4. By controlling the radii of curvature of the object-side surfaces and image-side surfaces of the first lens element and the fourth lens element, the incident angle of the principal ray of each field of view of the optical imaging lens on the image plane can be relatively reasonably controlled, thereby meeting the principal ray incident angle requirements of the optical system design and achieving effective ghost image control.

[0074] Preferably, the optical system satisfies the following condition: 0.35<f1 / f2<1.28; wherein f1 is the effective focal length of the first lens E1, and f2 is the effective focal length of the second lens E2. By controlling the ratio of the effective focal lengths of the first lens and the second lens in the optical system, on the one hand, it is beneficial to control the incident light height of the light beam entering the optical system, so as to reduce the higher-order aberrations of the optical system and the outer diameter of the lens; on the other hand, while controlling costs, the use of the second lens in combination with an aspheric surface can better correct the distortion of the system and reduce the amount of astigmatism to meet customer requirements for pixel density.

[0075] Preferably, the optical system satisfies the following conditions: -1.40 < f6 / f7 < -0.80; 2.10 < Vd6 / Vd7 < 2.90; where f6 is the effective focal length of the sixth lens element E6, f7 is the effective focal length of the seventh lens element E7, Vd6 is the Abbe number of the sixth lens element E6, and Vd7 is the Abbe number of the seventh lens element E7. The sixth and seventh lenses constitute a cemented lens. This limiting ratio of the effective focal lengths of the sixth and seventh lenses effectively corrects the system's astigmatism, thereby ensuring image quality in the peripheral field of view. Furthermore, properly matching the Abbe numbers of the materials can further reduce the system's axial and vertical chromatic aberrations, thereby improving the system's imaging quality.

[0076] Preferably, the refractive index Nd1 of the material of the first lens E1 is greater than 1.7. The use of high-refractive-index materials helps to further reduce the outer diameter of the component, thereby meeting customers' requirements for small size.

[0077] Preferably, the first lens E1 and the fourth lens E4 are spherical lenses, and the second lens E2, the third lens E3, the fifth lens E5, the sixth lens E6, the seventh lens E7, and the eighth lens E8 are aspherical lenses; the aperture of the optical system is located between the fifth lens E5 and the sixth lens E6; the sixth lens E6 and the seventh lens E7 form a bonded lens, and the remaining lenses are separated by air. The panoramic fisheye optical system configured in the present invention is mainly composed of 8 lenses and has a glass-plastic hybrid structure. The main advantages are a high pixel of 50M, a large target surface but a small volume, a short total length, and especially low cost. It has the advantages of low cost, high pixel, and ultra-wide angle design, a compact structure, and is easy to process and install, further improving the imaging effect of the equipment used in the system.

[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 2 Describe the optical imaging lens according to Example 1 of the present application, Figure 1 FIG. 1 shows a schematic structural diagram of an optical imaging lens according to Example 1 of the present application. 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, a fourth lens E4, a fifth lens E5, STO, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9 and an imaging surface S19.

[0080] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being concave and its image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being convex. The sixth lens E6 has positive optical power, with its object-side surface S12 being convex and its image-side surface S13 being convex. The seventh lens E7 has negative optical power, with its object-side surface S13 being concave and its image-side surface S14 being concave. The eighth lens E8 has positive optical power, with its object-side surface S15 being convex and its image-side surface S16 being concave. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0081] Table 1 shows the surface type, curvature radius, thickness, and material of each lens of the optical imaging lens of Example 1, wherein the units of curvature radius and thickness are both millimeters (mm).

[0082] Table 1: Basic parameters of the optical system of Example 1

[0083] Face number Surface type Curvature radius (mm) Thickness (mm) Material OBJ spherical surface endless endless S1 spherical surface 15.125 1.700 1.88,39.22 S2 spherical surface 5.047 2.100 S3 Aspheric 5.290 0.800 1.54,55.71 S4 Aspheric 2.246 3.110 S5 Aspheric -2.248 0.650 1.66,20.37 S6 Aspheric -4.365 0.070 S7 spherical surface 6.072 1.930 1.73,28.32 S8 spherical surface -9.001 0.120 S9 Aspheric 3.838 1.185 1.54,55.71 S10 Aspheric -67.903 0.310 STO flat endless 0.390 S12 Aspheric 6.697 1.695 1.54,55.71 S13 Aspheric -1.937 0.600 1.66,20.37 S14 Aspheric 18.689 0.300 S15 Aspheric 4.341 0.945 1.54,55.71 S16 Aspheric 7.713 0.800 S17 flat endless 0.300 1.52,64.20 S18 flat endless 0.732 S19 flat endless /

[0084] In Table 1, the object side and image side of any of the second lens element E2, the third lens element E3, the fifth lens element E5, the sixth lens element E6, the seventh lens element E7, and the eighth lens element E8 are aspherical surfaces. The surface shape of each aspherical lens element can be defined by, but is not limited to, the following aspherical surface formula:

[0085]

[0086] 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.

[0087] Table 2: Aspheric surface related values ​​of the lens surface of Example 1

[0088]

[0089] Figure 2 The field curvature curve and distortion curve of the optical imaging lens of Example 1 are shown. It can be seen from the figure that the optical imaging lens provided in Example 1 can achieve good imaging quality.

[0090] Example 2:

[0091] Specifically, as a preferred embodiment of the present invention but not limiting, the following reference is made to Figures 3 and 4 Describe the optical imaging lens according to Example 2 of the present application, Figure 3 FIG. 1 shows a schematic structural diagram of an optical imaging lens according to Example 2 of the present application. 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, a fourth lens E4, a fifth lens E5, STO, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9 and an imaging surface S19.

[0092] The first lens has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being concave and its image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being convex. The sixth lens E6 has positive optical power, with its object-side surface S12 being convex and its image-side surface S13 being convex. The seventh lens E7 has negative optical power, with its object-side surface S13 being concave and its image-side surface S14 being concave. The eighth lens E8 has positive optical power, with its object-side surface S15 being convex and its image-side surface S16 being concave. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from an object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19 .

[0093] 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).

[0094] Table 3: Basic parameters of the optical system of Example 2

[0095] Face number Surface type Curvature radius (mm) Thickness (mm) Material OBJ spherical surface 2000 1000 S1 spherical surface 13.384 1.700 1.95,32.32 S2 spherical surface 4.027 1.948 S3 Aspheric 8.820 0.600 1.54,55.71 S4 Aspheric 3.306 2.259 S5 Aspheric -2.263 0.610 1.66,20.37 S6 Aspheric -5.672 0.050 S7 spherical surface 6.079 1.671 1.85,23.78 S8 spherical surface -8.787 0.199 S9 Aspheric 4.016 1.190 1.54,55.71 S10 Aspheric -26.708 0.222 STO flat endless 0.157 S12 Aspheric 4.436 1.668 1.54,55.71 S13 Aspheric -1.545 0.600 1.66,20.37 S14 Aspheric 12.410 0.463 S15 Aspheric 4.529 0.903 1.54,55.71 S16 Aspheric 7.122 0.700 S17 flat endless 0.300 1.52,64.20 S18 flat endless 0.696 S19 flat endless /

[0096] In Table 3, the object side and image side surfaces of any of the second lens element E2, the third lens element E3, the fifth lens element E5, the sixth lens element E6, the seventh lens element E7, and the eighth lens element E8 are aspherical surfaces. The surface shape of each aspherical lens element can be defined by, but is not limited to, the following aspherical surface formula:

[0097]

[0098] 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 first embodiment.

[0099] Table 4: Aspheric surface related values ​​of the lens surface of Example 2

[0100]

[0101] Figure 4 The field curvature curve and distortion curve of the optical imaging lens of Example 2 are shown. It can be seen from the figure that the optical imaging lens provided in Example 2 can achieve good imaging quality.

[0102] Example 3:

[0103] Specifically, as a preferred embodiment of the present invention but not limiting, the following reference is made to Figures 5 and 6 Describe the optical imaging lens according to Example 3 of the present application, Figure 5 FIG. 4 shows a schematic structural diagram of an optical imaging lens according to Example 3 of the present application. 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, a fourth lens E4, a fifth lens E5, STO, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9 and an imaging surface S19.

[0104] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being concave and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being convex. The sixth lens E6 has positive optical power, with its object-side surface S12 being convex and its image-side surface S13 being convex. The seventh lens E7 has negative optical power, with its object-side surface S13 being concave and its image-side surface S14 being concave. The eighth lens E8 has positive optical power, with its object-side surface S15 being convex and its image-side surface S16 being concave. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0105] 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).

[0106] Table 5: Basic parameters of the optical system of Example 3

[0107] Face number Surface type Curvature radius (mm) Thickness (mm) Material OBJ spherical surface 2000 1000 S1 spherical surface 13.537 1.700 1.95,32.32 S2 spherical surface 3.778 2.732 S3 Aspheric -7.569 0.600 1.54,55.71 S4 Aspheric 32.238 1.482 S5 Aspheric -4.024 0.890 1.66,20.37 S6 Aspheric 55.000 0.040 S7 spherical surface 7.630 1.621 1.85,23.78 S8 spherical surface -7.100 0.063 S9 Aspheric 2.901 1.410 1.54,55.71 S10 Aspheric -20.663 0.295 STO flat endless 0.249 S12 Aspheric 13.300 1.480 1.54,55.71 S13 Aspheric -1.800 0.591 1.66,20.37 S14 Aspheric 14.391 0.475 S15 Aspheric 3.813 0.882 1.54,55.71 S16 Aspheric 5.586 0.700 S17 flat endless 0.300 1.52,64.20 S18 flat endless 0.821 S19 flat endless /

[0108] In Table 5, the object side and image side of any of the second lens element E2, the third lens element E3, the fifth lens element E5, the sixth lens element E6, the seventh lens element E7, and the eighth lens element E8 are aspherical surfaces. The surface shape of each aspherical lens element can be defined by, but is not limited to, the following aspherical surface formula:

[0109]

[0110] 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 6 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 first embodiment.

[0111] Table 6: Aspheric surface related values ​​of the lens surface of Example 3

[0112]

[0113] Figure 6 The field curvature curve and distortion curve of the optical imaging lens of Example 3 are shown. It can be seen from the figure that the optical imaging lens provided in Example 3 can achieve good imaging quality.

[0114] In Examples 1-3, the basic data are shown in Table 7:

[0115] Table 7 Basic data of Examples 1-3

[0116] Basic data Example 1 Example 2 Example 3 f(mm) 2.05 2.06 2.13 f1(mm) -9.26 -6.58 -5.96 f2(mm) -8.00 -10.23 -11.35 f3(mm) -7.91 -6.07 -5.58 f4(mm) 5.22 4.43 4.53 f5(mm) 6.80 6.59 4.84 f6(mm) 3.00 2.36 3.06 f7(mm) -2.59 -2.02 -2.36 f8(mm) 16.83 20.64 19.05 f67(mm) -72.67 603.72 -13.39 TTL(mm) 17.74 15.94 16.33 Fno 1.96 2.02 2.05 FOV(°) 200.0 200.0 200.0

[0117] In Examples 1-3, each conditional expression satisfies the following Table 8:

[0118] Table 8 Conditional formula for Examples 1-4

[0119] Conditional expression Example 1 Example 2 Example 3 D1 17.55 15.42 14.48 Ymax 3.42 3.55 3.49 D1 / (Fno*Ymax) 2.62 2.15 2.02 R1 15.13 13.38 13.54 R2 5.05 4.03 3.78 R7 6.07 6.08 7.63 R8 -9.00 -8.79 -7.10 Nd1 1.88 1.95 1.95 Vd6 55.71 55.71 55.71 Vd7 20.37 20.37 20.37 f1 / f -4.52 -3.19 -2.80 f2 / f -3.90 -4.97 -5.33 f3 / f -3.85 -2.95 -2.62 f4 / f 2.55 2.15 2.13 f5 / f 3.32 3.20 2.27 f6 / f 1.46 1.15 1.44 f7 / f -1.26 -0.98 -1.11 f8 / f 8.21 10.02 8.94 |R1 / R2| 3.00 3.32 3.58 |R7 / R8| 0.67 0.69 1.07 Vd6 / Vd7 2.73 2.73 2.73 f1 / f2 1.16 0.64 0.53 f6 / f7 -1.16 -1.17 -1.30

[0120] A camera module includes at least an optical lens, in which a high-pixel, large-target-area panoramic fisheye optical system is installed. The optical system is mainly composed of 8 lenses. By selecting an appropriate number of lenses and rationally configuring the optical focal length and surface shape of each lens, it has the advantages of low-cost, high-pixel, and ultra-wide-angle design. It has a compact structure and is easy to process and install, further improving the imaging effect of the system equipment and effectively meeting the design requirements of ultra-wide-angle and miniaturization of the optical system.

[0121] 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 high-pixel, large-area panoramic fisheye 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, a seventh lens, and an eighth 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 and its image side surface is concave; The third lens has negative optical power and its object side surface is concave; The fourth lens has positive refractive power, and its object-side surface is convex, and its image-side surface is convex; The fifth lens has positive refractive power, and its object-side surface is convex, and its image-side surface is convex; The sixth lens has positive refractive power, and its object-side surface is convex, and its image-side surface is convex; The seventh lens has negative optical power, and its object-side surface and image-side surface are concave; The eighth lens has positive refractive power, its object-side surface is convex, and its image-side surface is concave; The optical system meets the following conditions: -10.0mm<f1<-5.0mm; -15.5mm<f2<-7.5mm; -8.5mm<f3<-5.0mm; 2.9mm<f4<6.5mm; 4.0mm<f5<8.0mm; 2.0mm<f6<3.5mm; -3.0mm<f7<-1.5mm; 10.0mm<f8<50mm; Among them, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, f7 is the effective focal length of the seventh lens, and f8 is the effective focal length of the eighth lens.

2. The high-pixel, large-surface panoramic fisheye optical system according to claim 1, characterized in that: The optical system meets the following conditions: -5.5<f1 / f<-2.1; -8.3<f2 / f<-3.2; -4.6<f3 / f<-2.2; 1.3<f4 / f<3.5; 1.8<f5 / f<4.3; 0.9<f6 / f<1.9; -1.6<f7 / f<-0.7; 4.6<f8 / f<26.5; Wherein, f is the focal length of the entire optical system, wherein f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, f6 is the effective focal length of the sixth lens, f7 is the effective focal length of the seventh lens, and f8 is the effective focal length of the eighth lens.

3. The high-pixel, large-surface panoramic fisheye optical system according to claim 1 or 2, characterized in that: The full field of view FOV∈[180°,220°] of the optical system, and the total length TTL of the optical system ≤18 mm.

4. The high-pixel, large-area panoramic fisheye optical system according to claim 1 or 2, characterized in that: The optical system satisfies the following relationship: D1 / (Fno*Ymax)<2.8; Wherein, D1 is the maximum effective diameter of the first lens, Fno is the system aperture, and Ymax is the maximum image circle radius of the system.

5. The high-pixel, large-area panoramic fisheye optical system according to claim 1 or 2, characterized in that: The optical system meets the following conditions: 2.7<|R1 / R2|<3.7; 0.5<|R7 / R8|<1.3; Wherein R1 is the object side curvature of the first lens, R2 is the image side curvature of the first lens, R7 is the object side curvature of the fourth lens, and R8 is the image side curvature of the fourth lens.

6. The high-pixel, large-surface panoramic fisheye optical system according to claim 1 or 2, characterized in that: The optical system meets the following conditions: 0.35<f1 / f2<1.28; Wherein, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens.

7. The high-pixel, large-area panoramic fisheye optical system according to claim 1 or 2, characterized in that: The optical system satisfies the following conditions: -1.40<f6 / f7<-0.80; 2.10<Vd6 / Vd7<2.90; Wherein, f6 is the effective focal length of the sixth lens, f7 is the effective focal length of the seventh lens, Vd6 is the Abbe number of the sixth lens, and Vd7 is the Abbe number of the seventh lens.

8. The high-pixel, large-area panoramic fisheye optical system according to claim 1 or 2, characterized in that: The material refractive index Nd1 of the first lens is greater than 1.

7.

9. The high-pixel, large-area panoramic fisheye optical system according to claim 1 or 2, characterized in that: The first lens and the fourth lens are spherical lenses, and the second lens, the third lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens are aspherical lenses; The aperture of the optical system is located between the fifth lens and the sixth lens; The sixth lens and the seventh lens form a cemented lens, and the remaining lenses are separated by air.

10. A camera module, comprising at least an optical lens, characterized in that: The optical lens is equipped with a high-pixel, large-surface panoramic fisheye optical system according to any one of claims 1 to 9.

Images