A high-pixel small-volume panoramic fisheye optical system and an application camera module thereof

Abstract

The application provides a high-pixel small-volume panoramic fisheye optical system and an applied 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 diaphragm, a sixth lens, a seventh lens and an eighth lens along an optical axis from an object plane to an image plane. Through reasonable matching of shapes and optical powers of the lenses, the optical system has the advantages of high pixel, large target surface, super wide angle, athermal design, compact structure, easy processing and installation, effectively reduced volume of the optical system, and realized performance requirements of large aperture and high pixel, and further improved imaging effect of the system equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical imaging, in particular to a high-pixel small-volume panoramic fisheye optical system and a camera module applied thereto. BACKGROUND

[0002] In recent years, as the use of panoramic VR / AR gradually expands, the application scenarios of fisheye lenses are also more diversified; consumers have increasingly high requirements for the resolution and portability of lenses; the existing lenses on the market generally have the defects of low pixels, small target surface of sensing chips, large volume and low imaging clarity, and such lens designs have been difficult to meet the gradually increasing use requirements of photography enthusiasts. SUMMARY

[0003] To overcome the problems of low pixels, small target surface of sensing chips, large volume and low imaging clarity of existing fisheye lenses, the present application provides a high-pixel small-volume panoramic fisheye optical system and a camera module applied thereto, which has the advantages of high pixels, large target surface, ultra-wide angle and athermal design, compact structure, easy processing and installation, and further improves the imaging effect of the equipment matched with the system.

[0004] A high-pixel small-volume panoramic fisheye optical system, which is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a diaphragm, a sixth lens, a seventh lens and an eighth lens in sequence from an object plane to an image plane along an optical axis;

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

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

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

[0010] The sixth lens has optical 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 is concave and its image side surface is concave;

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

[0013] Further, the optical system satisfies the following condition: D1 / (Fno*Ymax) < 3.350, where 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.

[0014] Further, the optical system satisfies the following condition: (dn / dt)3 < -5*10 -06 / ℃;

[0015] |R5 / R6| > 1.24;

[0016] where (dn / dt)3 is the refractive index temperature coefficient of the third lens, R5 is the object side curvature of the third lens, and R6 is the image side curvature of the third lens.

[0017] Further, the optical system satisfies the following condition: (dn / dt)5 < -3.5*10 -06 / ℃;

[0018] |R9 / R8| > 1.10;

[0019] where (dn / dt)5 is the refractive index temperature coefficient of the fifth lens, R8 is the object side curvature of the fifth lens, and R9 is the image side curvature of the fifth lens.

[0020] Further, the optical system satisfies the following condition: (dn / dt)6 < -8.5*10 -06 / ℃;

[0021] |R12 / R11| > 0.48;

[0022] where (dn / dt)6 is the refractive index temperature coefficient of the sixth lens, R11 is the object side curvature of the sixth lens, and R12 is the image side curvature of the sixth lens.

[0023] Further, the optical system satisfies the following condition: f34 / f1 < -0.97;

[0024] where f34 is the effective focal length of the cemented lens of the third lens and the fourth lens combination, and f1 is the effective focal length of the first lens.

[0025] Further, the optical system satisfies the following condition: -1.1 < f4 / f3 < -0.35;

[0026] 0.11 < Vd4 / Vd3 < 0.50;

[0027] where f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, Vd3 is the material Abbe number constant of the third lens, and Vd4 is the material Abbe number constant of the fourth lens.

[0028] Further, the optical system satisfies the following condition:

[0029] 0.68 < f1 / f2;

[0030] Nd1 > 1.7;

[0031] wherein f1 is an effective focal length of the first lens, f2 is an effective focal length of the second lens, and Nd1 is a material refractive index of the first lens.

[0032] Further, the optical system satisfies the following condition: -1.00 < f7 / f6 < -0.65;

[0033] 0.11 < Vd7 / Vd6 < 0.50;

[0034] wherein f6 is an effective focal length of the sixth lens, f7 is an effective focal length of the seventh lens, Vd6 is a material Abbe number constant of the sixth lens, and Vd7 is a material Abbe number constant of the seventh lens.

[0035] Further, the optical system has a full field of view FOV ∈ [180°, 240°] and a total track length TTL ≤ 15 mm.

[0036] In another aspect, the application also provides a camera module comprising at least an optical lens, wherein the optical lens is installed with the high-pixel small-volume panoramic fisheye optical system.

[0037] Compared with the prior art, the application has the following advantages:

[0038] The high-pixel small-volume panoramic fisheye optical system and the camera module with the same according to the application are composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a diaphragm, a sixth lens, a seventh lens and an eighth lens along an optical axis from an object plane to an image plane. The high-pixel small-volume panoramic fisheye optical system has the advantages of high pixel, large target surface, ultra-wide angle, non-thermal design, compact structure, easy processing and installation, effective reduction of the volume of the optical system, and realization of the performance requirements of large aperture and high pixel, and further improvement of the imaging effect of the device with the system. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced.

[0040] Figure 1 is a structural schematic diagram of the optical system or the optical lens according to the embodiment 1 of the application;

[0041] Figure 2 is a field curvature curve and a distortion curve of the optical system or the optical lens according to the embodiment 1 of the application.

[0042] Figure 3 is a structural schematic diagram of an optical system or optical lens of Embodiment 2 of the present application;

[0043] Figure 4 is a field curvature curve and a distortion curve of the optical system or optical lens of Embodiment 2 of the present application;

[0044] Figure 5 is a structural schematic diagram of an optical system or optical lens of Embodiment 3 of the present application;

[0045] Figure 6 is a field curvature curve and a distortion curve of the optical system or optical lens of Embodiment 3 of the present application. DETAILED DESCRIPTION

[0046] As shown in Figures 1-6 , the present application provides a high-pixel small-volume 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 stop STO, a sixth lens E6, a seventh lens E7 and an eighth lens E8 in sequence along the optical axis from the object plane to the image plane;

[0047] The first lens E1 has negative optical power, and its object side surface is a convex surface and its image side surface is a concave surface;

[0048] The second lens E2 has negative optical power, and its image side surface is a concave surface;

[0049] The third lens E3 has negative optical power, and its object side surface is a concave surface and its image side surface is a concave surface;

[0050] The fourth lens E4 has positive optical power, and its object side surface is a concave surface;

[0051] The fifth lens E5 has positive optical power, and its object side surface is a convex surface and its image side surface is a convex surface;

[0052] The sixth lens E6 has optical power, and its object side surface is a convex surface and its image side surface is a convex surface;

[0053] The seventh lens E7 has negative optical power, and its object side surface is a concave surface and its image side surface is a concave surface;

[0054] The eighth lens E8 has positive optical power, and its object side surface is a convex surface and its image side surface is a concave surface.

[0055] The embodiment of the application discloses a high-pixel small-size 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 diaphragm STO, a sixth lens E6, a seventh lens E7 and an eighth lens E8 along an optical axis from an object plane to an image plane.

[0056] Further, the optical system satisfies the following condition: D1 / (Fno*Ymax)<3.350, 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, the optical effective diameter of the first lens is limited by limiting the size of the maximum image circle and the aperture of the optical imaging system, so that the system realizes the requirements of miniaturization, compact structure, easy processing and installation, and the imaging effect of the system equipment is further improved.

[0057] Further, the optical system satisfies the following condition: (dn / dt)3<-5*10 -06 / ℃; |R5 / R6|>1.24; wherein (dn / dt)3 is the refractive index temperature coefficient of the third lens E3, R5 is the object side curvature of the third lens E3, and R6 is the image side curvature of the third lens E3, the incident angle of the chief ray of each field of view of the optical imaging lens on the image plane can be relatively reasonably controlled by controlling the curvature radii of the object side and the image side of the third lens E3, the requirements of the optical system design main light incident angle are met, and the negative refractive index temperature coefficient is matched, so that the temperature performance is effectively improved.

[0058] Further, the optical system satisfies the following condition: (dn / dt)5<-3.5*10 -06 / ℃; |R9 / R8|>1.10; wherein (dn / dt)5 is the refractive index temperature coefficient of the fifth lens E5, R8 is the object side curvature of the fifth lens E5, and R9 is the image side curvature of the fifth lens E5, the incident angle of the chief ray of each field of view of the optical imaging lens on the image plane can be relatively reasonably controlled by controlling the curvature radii of the object side and the image side of the fifth lens E5, the requirements of the optical system design main light incident angle are met, and the negative refractive index temperature coefficient is matched, so that the temperature performance is effectively improved.

[0059] Further, the optical system satisfies the following condition: (dn / dt)6<-8.5*10 -06| (dn / dt) 6 | < 0.0005; | R12 / R11 | > 0.48; wherein (dn / dt) 6 is the temperature coefficient of the refractive index of the sixth lens E6, R11 is the object-side curvature of the sixth lens E6, and R12 is the image-side curvature of the sixth lens E6; by controlling the radii of curvature of the object-side surface and the image-side surface of the sixth lens E6, the incident angle of the chief ray of each field of view of the optical imaging lens on the image plane can be relatively reasonably controlled, the requirement of the incident angle of the chief ray of the optical system design is met, and the temperature performance is further improved by matching the negative temperature coefficient of the refractive index.

[0060] Further, the optical system satisfies the following condition: f34 / f1 < -0.97; wherein f34 is the effective focal length of the bonded lens composed of the third lens E3 and the fourth lens E4, and f1 is the effective focal length of the first lens E1; by reasonably controlling the effective focal length ratio of the first lens E1 and the bonded lens composed of the third lens E3 and the fourth lens E4, the optical system can meet the large field angle, limit the effective diameter of the part, control the size of the overall optical system, adjust the light incident angle, and be conducive to the correction of the aberration of the rear group of the system.

[0061] Further, the optical system satisfies the following condition: -1.1 < f4 / f3 < -0.35; 0.11 < Vd4 / Vd3 < 0.50; wherein f3 is the effective focal length of the third lens E3, f4 is the effective focal length of the fourth lens E4, Vd3 is the material Abbe number constant of the third lens E3, and Vd4 is the material Abbe number constant of the fourth lens E4; by limiting the effective focal length ratio of the third lens E3 and the fourth lens E4, the optical system can obtain a smaller light deflection angle and effectively reduce the part tolerance sensitivity.

[0062] Still further, in the specific embodiment of the present application, the third lens E3 and the fourth lens E4 constitute a bonded lens, the power of which is positive, the sixth lens E6 and the seventh lens E7 constitute a bonded lens, the power of which is positive, and the use of the bonded lens effectively reduces the existing position chromatic aberration and magnification chromatic aberration data of the system.

[0063] Further, the optical system satisfies the following condition: 0.68 < f1 / f2; 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 E1 and the second lens E2 of the optical system, on the one hand, the incident light height of the light bundle entering the optical system can be controlled to reduce the high-order aberration of the optical system and the size of the lens diameter; on the other hand, while controlling the cost, the use of the aspherical surface of the second lens E2 can better correct the distortion of the system, reduce the astigmatism, and meet the customer's demand for pixel density.

[0064] Furthermore, the optical system satisfies the following condition: Nd1 > 1.7; where Nd1 is the refractive index of the material of the first lens E1. The use of high refractive index material helps to further reduce the outer diameter of the component and meet the customer's small size requirements.

[0065] Furthermore, the optical system satisfies the following conditions: -1.00 < f7 / f6 < -0.65; 0.11 < Vd7 / Vd6 < 0.50; where f6 is the effective focal length of the sixth lens E6, f7 is the effective focal length of the seventh lens E7, Vd6 is the material Abbe number constant of the sixth lens E6, and Vd7 is the material Abbe number constant of the seventh lens E7. By limiting the effective focal length ratio of the sixth lens E6 and the seventh lens E7, the astigmatism of the system can be effectively corrected, thereby ensuring the image quality of the edge field of view. At the same time, by reasonably matching the material Abbe number, the chromatic aberration of the system can be further reduced, and the imaging quality of the system can be improved.

[0066] Furthermore, the optical system has a full field of view (FOV) of [180°, 240°] and a total optical system length (TTL) of ≤15mm. This design reduces the total optical length, making the lens smaller. The optical system configured in this invention has the advantages of high pixel count, large target surface, ultra-wide angle, and heat-free design. It has a compact structure, is easy to process and install, and further improves the imaging effect of the equipment paired with the system.

[0067] Specifically, as a preferred embodiment of the present invention and not a limitation thereof, the following references are made. Figures 1-2 Describes an optical imaging lens according to Embodiment 1 of this application. Figure 1 A schematic diagram of the structure of an optical imaging lens according to Embodiment 1 of this application is shown, as follows: Figure 1 As shown, the optical imaging lens according to an exemplary embodiment of this application includes, in sequence along the optical axis from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a STO, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an imaging surface S18.

[0068] The first lens E1 has negative focal power, the object side surface S1 is convex, and the image side surface S2 is concave. The second lens E2 has negative focal power, the object side surface S3 is convex, and the image side surface S4 is concave. The third lens E3 has negative focal power, the object side surface S5 is concave, and the image side surface S6 is concave. The fourth lens E4 has positive focal power, the object side surface S6 is convex, and the image side surface S7 is concave. The fifth lens E5 has positive focal power, the object side surface S8 is convex, and the image side surface S9 is convex. The sixth lens E6 has positive focal power, the object side surface S11 is convex, and the image side surface S12 is convex. The seventh lens E7 has negative focal power, the object side surface S12 is concave, and the image side surface S13 is concave. The eighth lens E8 has positive focal power, the object side surface S14 is convex, and the image side surface S15 is concave. The filter E9 has an object side surface S16 and an image side surface S17. Light from an object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S18.

[0069] Table 1 shows the surface type, radius of curvature, thickness and material of each lens of the optical imaging lens of Example 1, wherein the units of the radius of curvature and the thickness are millimeters (mm).

[0070] Table 1: Basic parameters of the optical system of Example 1

[0071] Surface No. Surface Type Curvature Radius (mm) Thickness (mm) Material OBJ Sphere Infinite Infinite S1 Sphere 10.493 2.500 2.00,28.32 S2 Sphere 2.259 1.353 S3 Asphere 3.989 0.600 1.88,37.20 S4 Asphere 1.757 1.003 S5 Sphere -5.013 0.500 1.49,81.61 S6 Sphere 3.864 1.103 2.00,25.42 S7 Sphere 69.781 0.113 S8 Asphere 2.558 1.458 1.62,63.82 S9 Asphere -4.591 0.099 STO Plane Infinite 0.001 S11 Sphere 2.644 1.396 1.57,71.30 S12 Sphere -1.880 0.490 1.92,18.90 S13 Sphere 12.451 0.211 S14 Asphere 3.139 0.669 1.88,37.20 S15 Asphere 9.462 0.200 S16 Plane Infinite 0.210 1.52,58.57 S17 Plane Infinite 1.090 S18 Plane Infinite /

[0072] In Table 1, the object side surface and the image side surface of each of the second lens E2, the fifth lens E5 and the eighth lens E8 are aspherical surfaces, and the surface type of each aspherical surface can be defined by, but not limited to, the following aspherical surface formula:

[0073]

[0074] wherein x is the distance from a corresponding point on the aspherical surface to a plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the vertex of the aspherical surface, k is the conic coefficient, and Ai is the coefficient corresponding to the ith high order term in the aspherical surface formula. Table 2 shows the conic coefficient and the high order term coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 of each aspherical surface that can be used in the first embodiment.

[0075] Table 2: Aspherical surface related values of the lenses of Example 1

[0076]

[0077] Figure 2 The field curvature curve and the distortion curve of the optical imaging lens of Example 1 are shown, and it can be seen that the optical imaging lens given in Example 1 can achieve good imaging quality and realize high performance design.

[0078] In particular, as a preferred embodiment of the present application but not limited, the following refers to Figures 3-4 An optical imaging lens according to Embodiment 2 of the present application is described, Figure 3 A structural schematic diagram of the optical imaging lens according to Embodiment 2 of the present application is shown.

[0079] As Figure 3 shown, the optical imaging lens according to the exemplary embodiment of the present application comprises, 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, an STO, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an imaging surface S18.

[0080] The first lens E1 has a negative focal power, the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface. The second lens E2 has a negative focal power, the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface. The third lens E3 has a negative focal power, the object side surface S5 is a concave surface, and the image side surface S6 is a concave surface. The fourth lens E4 has a positive focal power, the object side surface S6 is a convex surface, and the image side surface S7 is a convex surface. The fifth lens E5 has a positive focal power, the object side surface S8 is a convex surface, and the image side surface S9 is a convex surface. The sixth lens E6 has a positive focal power, the object side surface S11 is a convex surface, and the image side surface S12 is a convex surface. The seventh lens E7 has a negative focal power, the object side surface S12 is a concave surface, and the image side surface S13 is a concave surface. The eighth lens E8 has a positive focal power, the object side surface S14 is a convex surface, and the image side surface S15 is a concave surface. The filter E9 has an object side surface S16 and an image side surface S17. Light from an object passes through each surface S1 to S18 in order and is finally imaged on the imaging surface S18.

[0081] Table 3 shows the surface type, the radius of curvature, the thickness, and the material of each lens of the optical imaging lens of Embodiment 2, wherein the units of the radius of curvature and the thickness are millimeters (mm).

[0082] Table 3: Basic parameters of the optical system of Embodiment 2

[0083] Surface No. Surface Type Curvature Radius (mm) Thickness (mm) Material OBJ Sphere Infinite Infinite S1 Sphere 10.766 2.200 2.00,28.3 S2 Sphere 2.671 1.350 S3 Asphere 3.610 0.540 1.88,37.20 S4 Asphere 1.556 1.333 S5 Sphere -9.475 0.550 1.50,81.61 S6 Sphere 3.444 1.268 2.00,28.32 S7 Sphere -63.068 0.502 S8 Asphere 2.828 1.247 1.62,63.86 S9 Asphere -7.081 0.085 STO Plane Infinite 0.001 S11 Sphere 3.116 1.210 1.57,71.30 S12 Sphere -1.850 0.550 1.92,18.90 S13 Sphere 32.543 0.349 S14 Asphere 3.663 0.941 1.80,45.49 S15 Asphere 9.620 0.200 S16 Plane Infinite 0.210 1.52,58.57 S17 Plane Infinite 0.963 S18 Plane Infinite /

[0084] In Table 3, the object side surface and the image side surface of any one of the second lens E2, the fifth lens E5, and the eighth lens E8 are aspherical surfaces, and the surface type of each aspherical lens can be defined by, but is not limited to, the following aspherical surface formula:

[0085]

[0086] wherein x is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the vertex of the aspherical surface, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th high order term in the aspherical surface formula. Table 4 shows the conic coefficients and high order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 of the aspherical surfaces used in the first embodiment.

[0087] Table 4 Aspherical surface related values of the lens of embodiment 2

[0088]

[0089] Figure 4 The field curvature curve and the distortion curve of the optical imaging lens of embodiment 2 are shown. It can be seen that the optical imaging lens given in embodiment 2 can achieve good imaging quality, and high performance design is achieved.

[0090] In particular, as a preferred embodiment of the present application but not limited, the following refers to Figures 5-6 An optical imaging lens according to embodiment 3 of the present application is described, Figure 5 A structural schematic diagram of the optical imaging lens according to embodiment 3 of the present application is shown.

[0091] As Figure 5 shown, the optical imaging lens according to the exemplary embodiment of the present application sequentially includes, along the optical axis from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, an STO, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an imaging surface S18.

[0092] The first lens E1 has a negative focal power, the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface. The second lens E2 has a negative focal power, the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface. The third lens E3 has a negative focal power, the object side surface S5 is a concave surface, and the image side surface S6 is a concave surface. The fourth lens E4 has a positive focal power, the object side surface S6 is a convex surface, and the image side surface S7 is a concave surface. The fifth lens E5 has a positive focal power, the object side surface S8 is a convex surface, and the image side surface S9 is a convex surface. The sixth lens E6 has a positive focal power, the object side surface S11 is a convex surface, and the image side surface S12 is a convex surface. The seventh lens E7 has a negative focal power, the object side surface S12 is a concave surface, and the image side surface S13 is a concave surface. The eighth lens E8 has a positive focal power, the object side surface S14 is a convex surface, and the image side surface S15 is a concave surface. The filter E9 has an object side surface S16 and an image side surface S17. Light from the object sequentially passes through each surface S1 to S18 and is finally imaged on the imaging surface S18.

[0093] Table 5 shows the surface type, radius of curvature, thickness and material of each lens of the optical imaging lens of Example 3, wherein the units of the radius of curvature and the thickness are millimeter (mm).

[0094] Table 5: Basic parameters of the optical system of Example 3

[0095] Surface No. Surface Type Curvature Radius (mm) Thickness (mm) Material OBJ Sphere Infinite Infinite S1 Sphere 12.580 1.800 1.74,49.22 S2 Sphere 2.980 1.620 S3 Asphere 4.452 0.550 1.88,37.20 S4 Asphere 1.451 1.340 S5 Sphere 55.938 0.550 1.49,81.61 S6 Sphere 2.810 1.350 1.95,32.30 S7 Sphere 129.744 0.540 S8 Asphere 3.893 1.100 1.61,63.86 S9 Asphere -4.509 0.090 STO Plane Infinite 0.005 S11 Sphere 3.742 1.230 1.57,71.30 S12 Sphere -2.000 0.580 1.92,18.90 S13 Sphere -274.716 0.340 S14 Asphere 4.018 1.030 1.88,37.20 S15 Asphere 9.210 0.204 S16 Plane Infinite 0.210 1.52,58.57 S17 Plane Infinite 0.9576 S18 Plane Infinite /

[0096] In Table 5, the object side surface and the image side surface of each of the second lens E2, the fifth lens E5 and the eighth lens E8 are aspherical surfaces, and the surface shape of each aspherical surface can be defined by, but not limited to, the following aspherical surface formula:

[0097]

[0098] wherein x is the distance from the corresponding point on the aspherical surface to the tangent plane at the vertex of the surface, h is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature at the vertex of the aspherical surface, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th high order term in the aspherical surface formula. Table 6 shows the conic coefficient and the high order term coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 of each aspherical surface that can be used in the first embodiment.

[0099] Table 6: Aspherical surface related values of the lenses of Example 3

[0100]

[0101] Figure 6 The field curvature curve and the distortion curve of the optical imaging lens of Example 3 are shown, and it can be seen that the optical imaging lens given in Example 3 can achieve good imaging quality and realize high performance design.

[0102] In Examples 1-3, the basic data are shown in Table 11 below:

[0103] Table 11: Basic data of Examples 1-3

[0104] Basic Data Example 1 Example 2 Example 3 f1 (mm) -3.36 -4.07 -5.69 f2 (mm) -4.04 -3.51 -2.65 f3 (mm) -4.30 -5.00 -5.96 f4 (mm) 4.02 3.26 2.98 f5 (mm) 2.86 3.42 3.54 f6 (mm) 2.16 2.23 2.47 f7 (mm) -1.72 -1.86 -2.16 f8 (mm) 5.03 6.85 7.34 f34 (mm) 44.90 8.76 6.03 f67 (mm) 805.34 -110.67 -285.45 TTL (mm) 13.00 13.50 13.50 Fno 1.90 1.90 2.00 FOV (°) 200.0 200.0 200.0

[0105] In Examples 1-3, each conditional expression satisfies the conditions in Table 12 below:

[0106] Table 12: Conditional expressions of Examples 1-3

[0107] Conditional Expression Example 1 Example 2 Example 3 D1 12.00 12.55 13.32 Ymax 1.91 2.37 2.23 Vd3 81.61 81.61 81.61 Vd4 25.42 28.31 32.30 R5 -5.01 -9.48 55.94 R6 3.86 3.44 2.81 R8 2.55 2.83 3.89 R9 -4.59 -7.08 -4.51 R11 2.64 3.12 3.74 R12 -1.88 -1.85 -2.00 Nd1 2.00 2.00 1.74 Vd6 71.30 71.30 71.30 Vd7 18.89 18.89 18.89 D1 / (Fno*Ymax) 3.32 2.79 2.99 f34 / f1 -13.36 -2.15 -1.05 f4 / f3 -0.93 -0.65 -0.50 Vd4 / Vd3 0.30 0.34 0.39 |R5 / R6| 1.30 2.76 19.9 |R9 / R8| 1.80 2.50 1.15 |R12 / R11| 0.71 0.59 0.53 f7 / f6 -0.81 -0.80 -0.87 Vd7 / Vd6 0.26 0.26 0.26 f1 / f2 0.83 1.14 2.15

[0108] The application discloses a camera module, which comprises at least an optical lens, wherein the high-pixel small-volume panoramic fisheye optical system is installed in the optical lens, and the optical system is sequentially composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a diaphragm, a sixth lens, a seventh lens and an eighth lens from an object plane to an image plane along an optical axis.

[0109] The above is one or more embodiments provided in combination with specific contents, and does not mean that the specific implementation of the application is limited to the description. Any approximation, similarity or replacement of the method and structure of the application, or any technical deduction or replacement under the premise of the concept of the application, should be regarded as the protection scope of the application.

Claims

1. A high-pixel small-volume panoramic fisheye optical system, sequentially comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a diaphragm, a sixth lens, a seventh lens and an eighth lens along an optical axis from an object plane to an image plane, characterized in that: the first lens has a negative focal power, and a convex object side surface and a concave image side surface; the second lens has a negative focal power, and a convex object side surface and a concave image side surface; the third lens has a negative focal power, and a concave object side surface and a concave image side surface; the fourth lens has a positive focal power, and a convex object side surface; the fifth lens has a positive focal power, and a convex object side surface and a convex image side surface; the sixth lens has a focal power, and a convex object side surface and a convex image side surface; the seventh lens has a negative focal power, and a concave object side surface and a concave image side surface; the eighth lens has a positive focal power, and a convex object side surface and a concave image side surface; the optical system satisfies the following conditions: D1 / (Fno*Ymax) < 3.350; -1.00 < f7 / f6 < -0.65; 0.11 < Vd7 / Vd6 < 0.50; 0.68 < f1 / f2; Nd1 > 1.7; wherein D1 is the maximum effective diameter of the first lens, Fno is the system aperture, Ymax is the maximum image circle radius of the system, f6 is the effective focal length of the sixth lens, f7 is the effective focal length of the seventh lens, Vd6 is the material Abbe number constant of the sixth lens, Vd7 is the material Abbe number constant of the seventh lens, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, and Nd1 is the material refractive index of the first lens; |R5 / R6| > 1.24; wherein (dn / dt)3 is the refractive index temperature coefficient of the third lens, R5 is the object side curvature of the third lens, and R6 is the image side curvature of the third lens; |R9 / R8| > 1.10; wherein (dn / dt)5 is the refractive index temperature coefficient of the fifth lens, R8 is the object side curvature of the fifth lens, and R9 is the image side curvature of the fifth lens; |R12 / R11| > 0.48; wherein (dn / dt)6 is the refractive index temperature coefficient of the sixth lens, R11 is the object side curvature of the sixth lens, and R12 is the image side curvature of the sixth lens; the optical system satisfies the following condition: f34 / f1 < -0.97; wherein f34 is the effective focal length of the combined lens of the third lens and the fourth lens, and f1 is the effective focal length of the first lens; the optical system satisfies the following condition: -1.1 < f4 / f3 < -0.35; 0.11 < Vd4 / Vd3 < 0.50; wherein f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, Vd3 is the material Abbe number constant of the third lens, and Vd4 is the material Abbe number constant of the fourth lens; the full field of view FOV of the optical system is in the range of [180°, 240°], and the total track length TTL of the optical system is less than or equal to 15 mm. An optical lens is provided, wherein the optical lens comprises the high-pixel small-volume panoramic fisheye optical system according to any one of claims 1-7. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2. The high-pixel small-volume panoramic fisheye optical system according to claim 1, characterized in that, The optical system satisfies the following condition: (dn / dt)3 < -5*10 -06 / °C; ​ ​ 3.The high-pixel small-volume panoramic fisheye optical system according to claim 1, characterized in that, The optical system satisfies the following condition: (dn / dt)5 < -3.5*10 -06 / °C; ​ ​ 4.The high-pixel small-volume panoramic fisheye optical system according to claim 1, characterized in that, The optical system satisfies the following condition: (dn / dt)6 < -8.5*10 -06 / °C; ​ ​ 5. The high-pixel small-volume panoramic fisheye optical system according to any one of claims 1-4, characterized in that, ​ ​ 6. The high-pixel small-volume panoramic fisheye optical system according to any one of claims 1-4, characterized in that, ​ ​ ​ 7. The high-pixel small-volume panoramic fisheye optical system according to any one of claims 1-4, characterized in that, ​ 8. An image capturing module comprising at least an optical lens, characterized in that, ​

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