High-pixel small-size panoramic fisheye optical system and camera module applied by high-pixel small-size panoramic fisheye optical system

Abstract

The invention provides a high-pixel small-size panoramic fisheye optical system and a camera module applying the same, the high-pixel small-size panoramic fisheye optical system is mainly composed of eight lenses, through reasonable matching of lens shapes and focal power, the design requirements of an ultra-wide angle and high resolution of the optical system are effectively met, and the high-pixel small-size panoramic fisheye optical system has the advantages of high pixel, large target surface, ultra-wide angle and small size, and is compact in structure and convenient to use. Processing and installation are facilitated, and the imaging effect of equipment matched with the system is further improved.

Description

Technical Field

[0001] The present application relates to the field of optics, and in particular to a high-pixel, small-volume panoramic fisheye optical system and a camera module using the same. Background Art

[0002] In recent years, as the scope of use of panoramic VR / AR has gradually expanded, the application scenarios of fisheye lenses have become more diversified; consumers have put forward higher and higher requirements on the resolution and portability of lenses; the existing lenses on the market generally have defects such as low pixels, small sensor chip target area, large size, and low imaging clarity. This type of lens design has been difficult to adapt to the gradually increasing usage needs of photography enthusiasts. Summary of the invention

[0003] In order to solve the technical problems of low pixels, small sensor chip target surface, large volume and low imaging clarity commonly found in existing fisheye lenses, the present application provides a high-pixel and small-volume panoramic fisheye optical system, which has the advantages of high pixels, large target surface, ultra-wide angle and small volume, compact structure, easy processing and installation, and further improves the imaging effect of the equipment used in 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 sixth lens, a seventh lens, and an eighth lens in sequence from the object plane to the image plane along the optical axis; 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 convex, and its image side surface is concave; The third lens has positive refractive power, and its image side surface is convex; The fourth lens has negative optical power, its object side surface is concave, and its image side surface is convex; The fifth lens has positive refractive power, its object side surface is convex, and its image side surface is convex; The sixth lens has positive refractive power, its object side surface is convex, and its image side surface is convex; The seventh lens has negative optical power, its object side surface is concave, and its image side surface is concave; The sixth lens and the seventh lens constitute a cemented lens; The eighth lens has positive refractive power, its object side surface is convex, and its image side surface is concave.

[0005] As described above, the high-pixel small-volume panoramic fisheye optical system satisfies the following relationship: -0.22<f12 / f3≤-0.09; wherein f12 is the combined effective focal length of the first lens and the second lens, and f3 is the effective focal length of the third lens.

[0006] As described above, the high-pixel small-volume panoramic fisheye optical system satisfies the following relationship: 0.88<f34 / f567<1.0; wherein f34 is the combined effective focal length of the third lens and the fourth lens, and f567 is the combined effective focal length of the fifth lens, the sixth lens, and the seventh lens.

[0007] As described above, the high-pixel small-volume panoramic fisheye optical system satisfies the following relationship: TTL / (D1*Ymax)<1.0; wherein TTL is the total optical length of the optical system, D1 is the maximum effective diameter of the first lens, and Ymax is the maximum image circle radius of the optical system.

[0008] The high-pixel and small-volume panoramic fisheye optical system as described above satisfies the following relationship: (dn / dt)1<1.3*10 -06 / ℃; |R1 / R2|>3.0; wherein, (dn / dt)1 is the refractive index temperature coefficient of the first lens, R1 is the object side curvature of the first lens, and R2 is the image side curvature of the first lens.

[0009] The high-pixel and small-volume panoramic fisheye optical system as described above satisfies the following relationship: (dn / dt)4<-6.9*10 -06 / ℃; |R8 / R7|>1.2; wherein, (dn / dt)4 is the refractive index temperature coefficient of the fourth lens, R7 is the object side curvature of the fourth lens, and R8 is the image side curvature of the fourth lens.

[0010] The high-pixel and small-volume panoramic fisheye optical system as described above satisfies the following relationship: (dn / dt)6<-6.2*10 -06 / ℃,(dn / dt)7<-6.5*10 -06 / ℃; |R11 / R13|<1.1; wherein, (dn / dt)6 is the refractive index temperature coefficient of the sixth lens, (dn / dt)7 is the refractive index temperature coefficient of the seventh lens, R11 is the object side curvature of the sixth lens, and R13 is the image side curvature of the seventh lens.

[0011] As described above, the high-pixel small-volume panoramic fisheye optical system satisfies the following relationship: f2 / f3<-0.19; 0.9<Nd2 / Nd3<1.1; wherein f2 is the effective focal length of the second lens combination, f3 is the effective focal length of the third lens, Nd2 is the material refractive index constant of the second lens, and Nd3 is the material refractive index constant of the third lens.

[0012] The high-pixel small-volume panoramic fisheye optical system as described above satisfies the following relationship: -1.44<f6 / f7<-1.08; Vd6 / Vd7>2.73; wherein 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 constant of the sixth lens, and Vd7 is the material Abbe constant of the seventh lens.

[0013] 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 and small-volume panoramic fisheye optical system.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present application provides a high-pixel, small-volume panoramic fisheye optical system and a camera module used therein, which is mainly composed of 8 lenses. Through the reasonable combination of lens shape and optical focal length, it effectively meets the design requirements of ultra-wide angle and high resolution of the optical system. It has the advantages of high pixel, large target area, ultra-wide angle, and small volume, compact structure, and is easy to process and install, further improving the imaging effect of the system equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for describing the embodiments are briefly introduced below.

[0016] Figure 1 It is a structural schematic diagram of the optical system or camera module of Example 1 of the present application; Figure 2 is a field curvature curve and a distortion curve of the optical system or camera module in Example 1 of the present application; Figure 3 It is a structural schematic diagram of an optical system or a camera module according to Embodiment 2 of the present application; Figure 4 It is a field curvature curve and a distortion curve of the optical system or camera module of Example 2 of the present application; Figure 5 It is a structural schematic diagram of an optical system or a camera module according to Embodiment 3 of the present application; Figure 6 It is a field curvature curve and a distortion curve of the optical system or camera module of Example 3 of the present application; Figure 7 It is a structural schematic diagram of an optical system or a camera module according to Embodiment 4 of the present application; Figure 8 It is a field curvature curve and a distortion curve of the optical system or camera module of Example 4 of the present application; Fig. 9 It is a structural schematic diagram of an optical system or a camera module according to Embodiment 5 of the present application; Fig.10It is the field curvature curve and distortion curve of the optical system or camera module of Example 5 of the present application. DETAILED DESCRIPTION

[0017] like Figure 1-10 As shown, the present application provides 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 sixth lens, a seventh lens, and an eighth lens in sequence from the object plane to the image plane along the optical axis; The first lens has a negative optical power, the object side surface of which is convex, and the image side surface of which is concave; The second lens has a negative optical power, its object side surface is convex, and its image side surface is concave; The third lens has positive power and its image side surface is convex; a fourth lens having negative optical power, whose object side surface is concave and whose image side surface is convex; a fifth lens having positive refractive power, whose object-side surface is convex and whose image-side surface is convex; a sixth lens having positive refractive power, whose object-side surface is convex and whose image-side surface is convex; The seventh lens element has a negative optical power, and its object side surface is concave and its image side surface is concave; The eighth lens has positive refractive power, its object-side surface is convex, and its image-side surface is concave.

[0018] The optical system of the embodiment of the present invention is mainly composed of 8 lenses. Through the reasonable combination of lens shape and optical focal length, it effectively meets the design requirements of ultra-wide angle and high resolution of the optical system. It has the advantages of high pixel, large target surface, ultra-wide angle, and small volume. It has a compact structure and is easy to process and install, which further improves the imaging effect of the equipment matched with the system.

[0019] Furthermore, the optical system satisfies the following conditions: TTL / (D1*Ymax)<1.0; wherein TTL is the distance from the R1 surface of the first lens E1 to the image plane, D1 is the maximum effective diameter of the first lens E1, and Ymax is the maximum image circle radius of the system. By limiting the size of the maximum image circle of the optical imaging system and TTL, the optical effective diameter of the first lens and the total length of the optical system are limited, thereby ensuring that the system meets the requirements of miniaturization, has a compact structure, is easy to process and install, and further improves the imaging effect of the equipment equipped with the system.

[0020] Further, as a preferred embodiment of the present invention but not limiting, the optical system satisfies the following condition: (dn / dt)1<1.3*10 -06 / ℃; |R1 / R2|>3.0; where (dn / dt)1 is the refractive index temperature coefficient of the first lens E1, R1 is the object-side curvature of the first lens E1, and R2 is the image-side curvature of the first lens E1. By controlling the curvature radii of the object-side and image-side surfaces of the first lens E1, the incident angle of the main ray of each field of view of the optical imaging lens on the image plane can be relatively reasonably controlled to meet the requirements of the incident angle of the main ray in the optical system design, and at the same time, with the positive refractive index temperature coefficient, the temperature performance can be effectively improved.

[0021] Further, as a preferred embodiment of the present invention but not limiting, the optical system satisfies the following condition: (dn / dt)4<-6.9*10 -06 / ℃; |R8 / R7|>1.2; (dn / dt)4 is the refractive index temperature coefficient of the fourth lens E4, R7 is the object-side curvature of the fourth lens E4, and R8 is the image-side curvature of the fourth lens E4. By controlling the curvature radii of the object-side and image-side surfaces of the fourth lens E4, the incident angle of the main ray of each field of view of the optical imaging lens on the image plane can be relatively reasonably controlled to meet the requirements of the incident angle of the main ray in the optical system design, and at the same time, with the negative refractive index temperature coefficient, the temperature performance is effectively improved.

[0022] Further, as a preferred embodiment of the present invention but not limiting, the optical system satisfies the following condition: (dn / dt)6<-6.2*10 -06 / ℃,(dn / dt)7<-6.5*10 -06 / ℃; |R11 / R13|<1.1; Wherein, (dn / dt)6 is the refractive index temperature coefficient of the sixth lens E6, (dn / dt)7 is the refractive index temperature coefficient of the seventh lens E7, R11 is the object-side curvature of the sixth lens E6, and R13 is the image-side curvature of the seventh lens E7. By controlling the curvature radius of the object-side surface of the sixth lens E6 and the image-side surface of the seventh lens E7, the incident angle of the main ray of each field of view of the optical imaging lens on the image plane can be relatively reasonably controlled to meet the requirements of the incident angle of the main ray in the optical system design, and at the same time, with the negative refractive index temperature coefficient, the temperature performance is further improved.

[0023] Further, as a preferred embodiment of the present invention but not limiting, the optical system satisfies the following conditions: f2 / f3<-0.19; 0.9<Nd2 / Nd3<1.1; wherein f2 is the effective focal length of the second lens E2, f3 is the effective focal length of the third lens E3, Nd2 is the material refractive index constant of the second lens E2, and Nd3 is the material refractive index constant of the third lens E3. By reasonably controlling the effective focal length ratio range of the cemented lens composed of the second lens E2 and the third lens E3, the astigmatism of the lens can be effectively controlled, the effective diameter of the components can be limited, the size of the overall optical system can be controlled, and the incident angle of light can be adjusted.

[0024] Further, as a preferred embodiment of the present invention but not a limitation, the optical system satisfies the following condition: -0.22<f12 / f3≤-0.09; wherein f12 is the combined effective focal length of the first lens E1 and the second lens E2, and f3 is the effective focal length of the third lens E3. By limiting the effective focal length ratio of the first lens E1, the second lens E2, and the third lens E3, the optical system can have a larger light incident angle, obtain a larger convergence angle, and effectively reduce the total optical length of the system.

[0025] Further, as a preferred embodiment of the present invention but not limiting, the optical system satisfies the following conditions: -1.44<f6 / f7<-1.08; Vd6 / Vd7>2.73; wherein 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 constant of the sixth lens E6, and Vd7 is the material Abbe constant of the seventh lens E7. By limiting the effective focal length ratio of the sixth lens E6 and the seventh lens E7, the position chromatic aberration and magnification chromatic aberration data of the system are effectively reduced.

[0026] Furthermore, the optical system satisfies the following conditions: 0.88<f34 / f567<1.0; wherein f34 is the combined effective focal length of the third lens E3 and the fourth lens E4, and f567 is the combined effective focal length of the fifth lens E5, the sixth lens E6 and the seventh lens E7. By controlling the effective focal length ratio of the third lens E3 to the fourth lens E4 and the fifth lens E5, the sixth lens E6 and the seventh lens E7 of the optical system, on the one hand, it is beneficial to control the height of the light beam emitted from the optical system to reduce the higher-order aberrations of the optical system and the outer diameter of the lens; on the other hand, while controlling the cost, the use of the fourth lens E4 with an aspherical surface can better correct the distortion of the system and reduce the amount of astigmatism to meet the customer's demand for pixel density.

[0027] Embodiment 1 The following reference Figure 1 to Figure 2 An optical imaging lens according to Embodiment 1 of the present application is described. Figure 1 A schematic structural diagram of an optical imaging lens according to Embodiment 1 of the present application is shown.

[0028] like Figure 1 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.

[0029] The first lens E1 has negative focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is concave, and its image side surface S6 is convex. The fourth lens E4 has negative focal power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has positive focal power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has positive focal power, and its object side surface S12 is convex, and its image side surface S13 is convex. The seventh lens E7 has negative focal power, and its object side surface S13 is concave, and its image side surface S14 is concave. The eighth lens E8 has positive focal power, and its object side surface S15 is convex, and its image side surface S16 is 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 S19 in sequence and is finally imaged on the imaging surface S19.

[0030] 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 the curvature radius and thickness are both millimeters (mm).

[0031] Table 1

[0032] In Table 1, the object side and image side of any one of the second lens E2, the third lens E3, the fourth lens E4, the sixth lens E6, the seventh lens E7 and the eighth lens E8 are aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0033] Wherein, 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 vertex of the aspheric surface, k is the cone coefficient, and Ai is the coefficient corresponding to the i-th high-order term in the aspheric surface shape formula. Table 2 shows the cone coefficients and high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, and A24 of each aspheric surface that can be used in Example 1.

[0034] Table 2

[0035] Embodiment 2 The following reference Figure 3 to Figure 4 An optical imaging lens according to Embodiment 2 of the present application is described. Figure 3 A schematic structural diagram of an optical imaging lens according to Embodiment 2 of the present application is shown.

[0036] like Figure 3As 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.

[0037] The first lens E1 has negative focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is concave, and its image side surface S6 is convex. The fourth lens E4 has negative focal power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has positive focal power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has positive focal power, and its object side surface S12 is convex, and its image side surface S13 is convex. The seventh lens E7 has negative focal power, and its object side surface S13 is concave, and its image side surface S14 is concave. The eighth lens E8 has positive focal power, and its object side surface S15 is convex, and its image side surface S16 is 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 S19 in sequence and is finally imaged on the imaging surface S19.

[0038] Table 3 shows the surface type, curvature radius, thickness and material of each lens of the optical imaging lens of Example 2, wherein the units of the curvature radius and thickness are both millimeters (mm).

[0039] Table 3

[0040] In Table 3, the object side surface and the image side surface of any one of the second lens E2, the third lens E3, the fourth lens E4, the sixth lens E6, the seventh lens E7 and the eighth lens E8 are aspherical surfaces:

[0041] Wherein, 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 vertex of the aspheric surface, k is the cone coefficient, and Ai is the coefficient corresponding to the i-th high-order term in the aspheric surface shape formula. Table 4 shows the cone coefficients and high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 of each aspheric surface that can be used in Example 2.

[0042] Table 4

[0043] Embodiment 3 The following reference Figures 5 and 6An optical imaging lens according to Embodiment 3 of the present application is described. Figure 5 A schematic structural diagram of an optical imaging lens according to Embodiment 3 of the present application is shown.

[0044] like Figure 5 As shown, the optical imaging lens according to an exemplary embodiment of the present application includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, 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.

[0045] The first lens E1 has negative focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative focal power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has positive focal power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has positive focal power, and its object side surface S12 is convex, and its image side surface S13 is convex. The seventh lens E7 has negative focal power, and its object side surface S13 is concave, and its image side surface S14 is concave. The eighth lens E8 has positive focal power, and its object side surface S15 is convex, and its image side surface S16 is 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 S19 in sequence and is finally imaged on the imaging surface S19.

[0046] Table 5 shows the surface type, curvature radius, thickness and material of each lens of the optical imaging lens of Example 3, wherein the units of the curvature radius and thickness are both millimeters (mm).

[0047] Table 5

[0048] In Table 5, the object side and image side of any one of the second lens E2, the third lens E3, the fourth lens E4, the sixth lens E6, the seventh lens E7 and the eighth lens E8 are aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0049] 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 cone coefficient, and Ai is the coefficient corresponding to the i-th high-order term in the aspherical surface shape formula. Table 6 shows the cone coefficients and high-order term coefficients A4, A6, A8, A10, A12, A14 and A16 of each aspherical surface that can be used in Example 3.

[0050] Table 6

[0051] Embodiment 4: The following reference Figures 7 and 8 An optical imaging lens according to Embodiment 3 of the present application is described. Figure 7 A schematic structural diagram of an optical imaging lens according to Embodiment 4 of the present application is shown.

[0052] like Figure 7 As shown, the optical imaging lens according to an exemplary embodiment of the present application includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, 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.

[0053] The first lens E1 has negative focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is concave, and its image side surface S6 is convex. The fourth lens E4 has negative focal power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has positive focal power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has positive focal power, and its object side surface S12 is convex, and its image side surface S13 is convex. The seventh lens E7 has negative focal power, and its object side surface S13 is concave, and its image side surface S14 is concave. The eighth lens E8 has positive focal power, and its object side surface S15 is convex, and its image side surface S16 is 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 S19 in sequence and is finally imaged on the imaging surface S19.

[0054] Table 7 shows the surface type, curvature radius, thickness and material of each lens of the optical imaging lens of Example 4, wherein the units of the curvature radius and thickness are both millimeters (mm).

[0055] Table 7

[0056] In Table 7, the object side and image side of any one of the second lens E2, the third lens E3, the fourth lens E4, the sixth lens E6, the seventh lens E7 and the eighth lens E8 are aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical formula:

[0057] Wherein, 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 vertex of the aspheric surface, k is the cone coefficient, and Ai is the coefficient corresponding to the i-th high-order term in the aspheric surface shape formula. Table 8 shows the cone coefficients and high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22 and A24 of each aspheric surface that can be used in Example 4.

[0058] Table 8

[0059] Embodiment 5 The following reference Figures 9 and 10 An optical imaging lens according to Embodiment 5 of the present application is described. Fig. 9 A schematic structural diagram of an optical imaging lens according to Embodiment 5 of the present application is shown.

[0060] like Fig. 9 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.

[0061] The first lens E1 has negative focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive focal power, and its object side surface S5 is convex, and its image side surface S6 is convex. The fourth lens E4 has negative focal power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has positive focal power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has positive focal power, and its object side surface S12 is convex, and its image side surface S13 is convex. The seventh lens E7 has negative focal power, and its object side surface S13 is concave, and its image side surface S14 is concave. The eighth lens E8 has positive focal power, and its object side surface S15 is convex, and its image side surface S16 is 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 S19 in sequence and is finally imaged on the imaging surface S19.

[0062] Table 9 shows the surface type, curvature radius, thickness and material of each lens of the optical imaging lens of Example 5, wherein the units of the curvature radius and thickness are both millimeters (mm).

[0063] Table 9

[0064] In Table 9, the object side and image side of any one of the second lens E2, the third lens E3, the fourth lens E4, the sixth lens E6, the seventh lens E7 and the eighth lens E8 are aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0065] Wherein, 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 vertex of the aspheric surface, k is the cone coefficient, and Ai is the coefficient corresponding to the i-th high-order term in the aspheric surface shape formula. Table 10 shows the cone coefficients and high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 of each aspheric surface that can be used in Example 10.

[0066] Table 10

[0067] In Examples 1-5, each conditional expression satisfies the conditions in the following table: Table 11

[0068] A camera module at least includes an optical lens, in which the above-mentioned high-pixel and small-volume panoramic fisheye optical system is installed. It has the advantages of high pixel, large target surface, ultra-wide angle and small volume, compact structure, and is easy to process and install, further improving the imaging effect of the equipment matched with the system.

[0069] As described above, one or more implementation methods are provided in combination with specific contents, and the specific implementation of the present invention is not limited to these descriptions. Any similarity or similarity with the method, structure, etc. of the present invention, or any technical deduction or replacement based on the concept of the present invention, shall be regarded as the protection scope of the present invention.

Claims

1. 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 sixth lens, a seventh lens, and an eighth lens in sequence from the object plane to the image plane along the optical axis, 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 convex, and its image side surface is concave; The third lens has positive refractive power, and its image side surface is convex; The fourth lens has negative optical power, its object side surface is concave, and its image side surface is convex; The fifth lens has positive refractive power, its object side surface is convex, and its image side surface is convex; The sixth lens has positive refractive power, its object side surface is convex, and its image side surface is convex; The seventh lens has negative optical power, its object side surface is concave, and its image side surface is concave; The sixth lens and the seventh lens constitute a cemented lens; The eighth lens has positive refractive power, its object side surface is convex, and its image side surface is concave; The optical system satisfies the following relationship: 0.88<f34 / f567<1.0; Among them, f34 is the combined effective focal length of the third lens and the fourth lens, and f567 is the combined effective focal length of the fifth lens, the sixth lens and the seventh lens.

2. The high-pixel and small-volume panoramic fisheye optical system according to claim 1, characterized in that: The optical system satisfies the following relationship: -0.22<f12 / f3≤-0.09; Wherein, f12 is the combined effective focal length of the first lens and the second lens, and f3 is the effective focal length of the third lens.

3. The high-pixel, small-volume panoramic fisheye optical system according to claim 1, characterized in that: (dn / dt)6<-6.2*10 -06 / ℃,(dn / dt)7<-6.5*10 -06 / ℃; Wherein, (dn / dt)6 is the refractive index temperature coefficient of the sixth lens, and (dn / dt)7 is the refractive index temperature coefficient of the seventh lens.

4. The high-pixel, small-volume panoramic fisheye optical system according to any one of claims 1 to 3, characterized in that: The optical system satisfies the following relationship: TTL / (D1*Ymax)<1.0; Wherein, TTL is the total optical length of the optical system, D1 is the maximum effective diameter of the first lens, and Ymax is the maximum image circle radius of the optical system.

5. The high-pixel and small-volume panoramic fisheye optical system according to any one of claims 1 to 3, characterized in that: The optical system satisfies the following relationship: (dn / dt)1<1.3*10 -06 / ℃; |R1 / R2|>3.0; Wherein, (dn / dt)1 is the refractive index temperature coefficient of the first lens, R1 is the object side curvature of the first lens, and R2 is the image side curvature of the first lens.

6. The high-pixel, small-volume panoramic fisheye optical system according to any one of claims 1 to 3, characterized in that: The optical system satisfies the following relationship: (dn / dt)4<-6.9*10 -06 / ℃; |R8 / R7|>1.2; Wherein, (dn / dt)4 is the refractive index temperature coefficient of the fourth lens, R7 is the object side curvature of the fourth lens, and R8 is the image side curvature of the fourth lens.

7. The high-pixel, small-volume panoramic fisheye optical system according to any one of claims 1 to 3, characterized in that: The optical system satisfies the following relationship: |R11 / R13|<1.1; Wherein, R11 is the object-side curvature of the sixth lens, and R13 is the image-side curvature of the seventh lens.

8. The high-pixel and small-volume panoramic fisheye optical system according to any one of claims 1 to 3, characterized in that: The optical system satisfies the following relationship: f2 / f3<-0.19; 0.9<Nd2 / Nd3<1.1; Wherein, f2 is the effective focal length of the second lens combination, f3 is the effective focal length of the third lens, Nd2 is the material refractive index constant of the second lens, and Nd3 is the material refractive index constant of the third lens.

9. The high-pixel, small-volume panoramic fisheye optical system according to any one of claims 1 to 3, characterized in that: The optical system satisfies the following relationship: -1.44<f6 / f7<-1.08; Vd6 / Vd7>2.73; Wherein, 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 constant of the sixth lens, and Vd7 is the material Abbe constant of the seventh lens.

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

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