A high-resolution, compact panoramic fisheye optical system and its application in camera modules.

Abstract

This application provides a high-pixel, small-volume panoramic fisheye optical system and its application camera module, which mainly consists of 8 lenses. Through the reasonable combination of lens shape and optical power, it effectively meets the design requirements of ultra-wide-angle and high-resolution optical systems. It has the advantages of high pixel count, large target area, ultra-wide-angle, and small volume. The structure is compact, easy to process and install, and further improves the imaging effect of the system equipment.

Description

Technical Field

[0001] This application relates to the field of optics, and in particular to a high-pixel, small-volume panoramic fisheye optical system and its application in camera modules. Background Technology

[0002] In recent years, as the application scope of panoramic VR / AR has gradually expanded, the application scenarios of fisheye lenses have become more diversified. Consumers have put forward increasingly higher requirements for the resolution and portability of lenses. Existing lenses on the market generally have defects such as low pixel count, small sensor chip target surface, large size, and low image clarity. Such lens designs are no longer able to meet the increasingly higher usage needs of photography enthusiasts. Summary of the Invention

[0003] This application addresses the technical problems of existing fisheye lenses, such as low pixel count, small sensor chip surface area, large size, and low image clarity, by providing a high-pixel, small-volume panoramic fisheye optical system. This system has the advantages of high pixel count, large sensor surface area, ultra-wide angle, and small size. It has a compact structure, is easy to process and install, and further improves the imaging effect of the equipment used with this system.

[0004] A high-pixel, small-volume panoramic fisheye optical system 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, arranged sequentially along the optical axis from the object plane to the image plane.

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

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

[0007] The third lens has positive optical power and its image-side surface is convex.

[0008] The fourth lens has negative optical power, its object side is concave, and its image side is convex.

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

[0010] The sixth lens has positive optical power, and its object side is convex, and its image side is convex.

[0011] The seventh lens has negative optical power, and its object side is concave, as is its image side.

[0012] The sixth and seventh lenses constitute an adhesive lens;

[0013] The eighth lens has positive optical power, its object side is convex, and its image side is concave.

[0014] The high-pixel, small-volume panoramic fisheye optical system described above satisfies the following relationship: -0.22 < f12 / f3 ≤ -0.09; where f12 is the combined effective focal length of the first and second lenses, and f3 is the effective focal length of the third lens.

[0015] The high-pixel, small-volume panoramic fisheye optical system described above satisfies the following relationship: 0.88 < f34 / f567 < 1.0; where f34 is the combined effective focal length of the third and fourth lenses, and f567 is the combined effective focal length of the fifth, sixth, and seventh lenses.

[0016] The high-pixel, small-volume panoramic fisheye optical system described above satisfies the following relationship: TTL / (D1*Ymax) < 1.0; where 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.

[0017] The high-pixel, small-volume panoramic fisheye optical system described above satisfies the following relationship: (dn / dt)1 < 1.3 * 10 -06 / ℃; |R1 / R2|>3.0; where (dn / dt)1 is the temperature coefficient of refractive index of the first lens, R1 is the object curvature of the first lens, and R2 is the image curvature of the first lens.

[0018] The high-pixel, small-volume panoramic fisheye optical system described above satisfies the following relationship: (dn / dt)⁴ < -6.9 * 10⁻⁶. -06 / ℃;|R8 / R7|>1.2; Where, (dn / dt)4 is the refractive index temperature coefficient of the fourth lens, R7 is the object curvature of the fourth lens, and R8 is the image curvature of the fourth lens.

[0019] The high-pixel, small-volume panoramic fisheye optical system described above satisfies the following relationship: (dn / dt)⁶ < -6.2 * 10⁻⁶. -06 / ℃, (dn / dt)7<-6.5*10 -06 / ℃; |R11 / R13|<1.1; where (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 curvature of the sixth lens, and R13 is the image curvature of the seventh lens.

[0020] The high-pixel, small-volume panoramic fisheye optical system described above satisfies the following relationships: f2 / f3 < -0.19; 0.9 < Nd2 / Nd3 < 1.1; where 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.

[0021] The high-pixel, small-volume panoramic fisheye optical system described above satisfies the following relationships: -1.44 < f6 / f7 < -1.08; Vd6 / Vd7 > 2.73; where 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, and Vd7 is the material Abbe number constant of the seventh lens.

[0022] On the other hand, this application embodiment also provides a camera module, which includes at least an optical lens, and the optical lens is equipped with the above-mentioned high-pixel small-volume panoramic fisheye optical system.

[0023] Compared with the prior art, the beneficial effects of this application are as follows:

[0024] This application provides a high-pixel, small-volume panoramic fisheye optical system and its application camera module, which mainly consists of 8 lenses. Through the reasonable combination of lens shape and optical power, it effectively meets the design requirements of ultra-wide-angle and high-resolution optical systems. It has the advantages of high pixel count, large target area, ultra-wide-angle, and small volume. The structure is compact, easy to process and install, and further improves the imaging effect of the system equipment. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0026] Figure 1 This is a schematic diagram of the structure of the optical system or camera module in Embodiment 1 of this application;

[0027] Figure 2 The field curvature curve and distortion curve of the optical system or camera module in Embodiment 1 of this application;

[0028] Figure 3 This is a schematic diagram of the structure of the optical system or camera module in Embodiment 2 of this application;

[0029] Figure 4 The field curvature curve and distortion curve of the optical system or camera module in Embodiment 2 of this application;

[0030] Figure 5 This is a schematic diagram of the structure of the optical system or camera module in Embodiment 3 of this application;

[0031] Figure 6 The field curvature curve and distortion curve of the optical system or camera module in Embodiment 3 of this application;

[0032] Figure 7 This is a schematic diagram of the structure of the optical system or camera module in Embodiment 4 of this application;

[0033] Figure 8 The field curvature curve and distortion curve of the optical system or camera module in Embodiment 4 of this application;

[0034] Figure 9 This is a schematic diagram of the structure of the optical system or camera module in Embodiment 5 of this application;

[0035] Figure 10 These are the field curvature curves and distortion curves of the optical system or camera module in Embodiment 5 of this application. Detailed Implementation

[0036] like Figure 1-10 As shown, this 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 along the optical axis from the object plane to the image plane;

[0037] The first lens with negative optical power has a convex object side and a concave image side.

[0038] A second lens with negative optical power has a convex object side and a concave image side.

[0039] A third lens with positive optical power has a convex image-side surface;

[0040] The fourth lens with negative optical power has a concave object side and a convex image side.

[0041] The fifth lens with positive optical power has a convex object-side surface and a convex image-side surface.

[0042] The sixth lens with positive optical power has a convex object-side surface and a convex image-side surface.

[0043] The seventh lens with negative optical power has a concave object side and a concave image side.

[0044] The eighth lens has positive optical power, with a convex object side and a concave image side.

[0045] The optical system of this invention mainly consists of 8 lenses. Through the reasonable combination of lens shape and optical power, it effectively meets the design requirements of ultra-wide angle and high resolution of the optical system. It has the advantages of high pixel count, large target surface, ultra-wide angle, and small size. The structure is compact, easy to process and install, and further improves the imaging effect of the equipment paired with the system.

[0046] Furthermore, the optical system satisfies the following condition: TTL / (D1*Ymax) < 1.0; where TTL is the distance from the R1 plane 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 dimensions of the maximum image circle and TTL of the optical imaging system, the effective optical diameter of the first lens and the total length of the optical system are limited, thereby ensuring the miniaturization requirement of the system, resulting in a compact structure that is easy to manufacture and install, and further improving the imaging effect of the equipment paired with the system.

[0047] Furthermore, as a preferred embodiment of the present invention and not a limitation thereof, 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 principal rays in each field of view of the optical imaging lens on the image plane can be reasonably controlled, meeting the requirements of the principal ray incident angle in the optical system design. Simultaneously, combined with a positive refractive index temperature coefficient, temperature performance is effectively improved.

[0048] Furthermore, as a preferred embodiment of the present invention and not a limitation thereof, the optical system satisfies the following condition: (dn / dt)⁴ < -6.9 * 10⁻⁶. -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 principal rays in each field of view of the optical imaging lens on the image plane can be reasonably controlled, meeting the requirements of the principal ray incident angle in the optical system design. Simultaneously, the negative refractive index temperature coefficient effectively improves temperature performance.

[0049] Furthermore, as a preferred embodiment of the present invention and not a limitation thereof, the optical system satisfies the following condition: (dn / dt)⁶ < -6.2 * 10⁻⁶. -06 / ℃, (dn / dt)7<-6.5*10 -06 / ℃; |R11 / R13|<1.1; where (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 radii 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 principal rays in each field of view of the optical imaging lens on the image plane can be reasonably controlled, meeting the requirements of the principal ray incident angle in the optical system design. Furthermore, by combining this with a negative refractive index temperature coefficient, temperature performance is further improved.

[0050] Furthermore, as a preferred embodiment of the present invention and not a limitation thereof, the optical system satisfies the following conditions: f2 / f3 < -0.19; 0.9 < Nd2 / Nd3 < 1.1; where 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 refractive index constant of the material of the second lens E2, and Nd3 is the refractive index constant of the material of the third lens E3. By reasonably controlling the effective focal length ratio range of the bonded lens combining 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 overall size of the optical system can be controlled, and the incident angle of light can be adjusted.

[0051] Furthermore, as a preferred embodiment of the present invention and not a limitation thereof, the optical system satisfies the following condition: -0.22 < f12 / f3 ≤ -0.09; where 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 ratio of the effective focal lengths of the first lens E1, the second lens E2, and the third lens E3, the optical system can achieve a larger incident angle of light, obtain a larger convergence angle of light, and effectively reduce the total optical length of the system.

[0052] Furthermore, as a preferred embodiment of the present invention and not a limitation thereof, the optical system satisfies the following conditions: -1.44 < f6 / f7 < -1.08; Vd6 / Vd7 > 2.73; 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 Abbe number constant of the material of the sixth lens E6, and Vd7 is the Abbe number constant of the material of the seventh lens E7. By limiting the effective focal length ratio of the sixth lens E6 and the seventh lens E7, the positional chromatic aberration and magnification chromatic aberration data of the system are effectively reduced.

[0053] Furthermore, the optical system satisfies the following condition: 0.88 < f34 / f567 < 1.0; where 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 ratios of the third lens E3 and the fourth lens E4 and the fifth lens E5, and the sixth lens E6 and the seventh lens E7, it is beneficial to control the height of the emitted light beam from the optical system, thereby reducing higher aberrations and the outer diameter of the lenses; on the other hand, while controlling costs, the fourth lens E4, combined with an aspherical surface, can better correct system distortion and reduce astigmatism to meet customer requirements for pixel density.

[0054] Example 1

[0055] The following is for reference Figures 1 to 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.

[0056] like 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 S19.

[0057] 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 positive optical power, with its object-side surface S5 being concave and its image-side surface S6 being convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being concave 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 sequentially through each surface S1 to S19 and is finally imaged on the imaging surface S19.

[0058] Table 1 shows the surface type, radius of curvature, thickness, and material of each lens in the optical imaging lens of Example 1, wherein the units for radius of curvature and thickness are millimeters (mm).

[0059] Table 1

[0060]

[0061] In Table 1, the object-side surface and image-side surface of any one of the following lenses—E2, E3, E4, E6, E7, and E8—are aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formulas:

[0062]

[0063] Where 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 higher-order term in the aspherical surface shape formula. Table 2 gives the conic coefficients and higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, and A24 that can be used for each aspherical surface in Example 1.

[0064] Table 2

[0065]

[0066] Example 2

[0067] The following is for reference Figures 3 to 4 Describes an optical imaging lens according to Embodiment 2 of this application. Figure 3 A schematic diagram of the structure of an optical imaging lens according to Embodiment 2 of this application is shown.

[0068] like Figure 3 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 S19.

[0069] 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 positive optical power, with its object-side surface S5 being concave and its image-side surface S6 being convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being concave 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 sequentially through each surface S1 to S19 and is finally imaged on the imaging surface S19.

[0070] Table 3 shows the surface type, radius of curvature, thickness, and material of each lens in the optical imaging lens of Example 2, wherein the units for radius of curvature and thickness are millimeters (mm).

[0071] Table 3

[0072]

[0073] In Table 3, the object-side surface and image-side surface of any one of the following lenses—E2, E3, E4, E6, E7, and E8—are aspherical:

[0074]

[0075] Where 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 higher-order term in the aspherical surface shape formula. Table 4 gives the conic coefficients and higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical surface in Example 2.

[0076] Table 4

[0077]

[0078] Example 3

[0079] The following is for reference Figures 5 to 6 Describes an optical imaging lens according to Embodiment 3 of this application. Figure 5 A schematic diagram of the structure of an optical imaging lens according to Embodiment 3 of this application is shown.

[0080] like Figure 5 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 S19.

[0081] 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 positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being concave 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 sequentially through each surface S1 to S19 and is finally imaged on the imaging surface S19.

[0082] Table 5 shows the surface type, radius of curvature, thickness, and material of each lens in the optical imaging lens of Example 3, wherein the units for radius of curvature and thickness are millimeters (mm).

[0083] Table 5

[0084]

[0085] In Table 5, the object-side surface and image-side surface of any one of the following lenses—E2, E3, E4, E6, E7, and E8—are aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formulas:

[0086]

[0087] Where 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 higher-order term in the aspherical surface shape formula. Table 6 gives the conic coefficients and higher-order term coefficients A4, A6, A8, A10, A12, A14, and A16 that can be used for each aspherical surface in Example 3.

[0088] Table 6

[0089]

[0090] Example 4

[0091] The following is for reference Figures 7 to 8 Describes an optical imaging lens according to Embodiment 3 of this application. Figure 7 A schematic diagram of the structure of an optical imaging lens according to Embodiment 4 of this application is shown.

[0092] like Figure 7 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 S19.

[0093] 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 positive optical power, with its object-side surface S5 being concave and its image-side surface S6 being convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being concave 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 sequentially through each surface S1 to S19 and is finally imaged on the imaging surface S19.

[0094] Table 7 shows the surface type, radius of curvature, thickness, and material of each lens in the optical imaging lens of Example 4, wherein the units for radius of curvature and thickness are millimeters (mm).

[0095] Table 7

[0096]

[0097] In Table 7, the object-side surface and image-side surface of any one of the following lenses—E2, E3, E4, E6, E7, and E8—are aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formulas:

[0098]

[0099] Where 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 higher-order term in the aspherical surface shape formula. Table 8 gives the conic coefficients and higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, and A24 that can be used for each aspherical surface in Example 4.

[0100] Table 8

[0101]

[0102] Example 5

[0103] The following is for reference Figures 9 to 10 Describes an optical imaging lens according to Embodiment 5 of this application. Figure 9 A schematic diagram of the structure of an optical imaging lens according to Embodiment 5 of this application is shown.

[0104] like Figure 9 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 S19.

[0105] 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 positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has negative optical power, with its object-side surface S7 being concave 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 sequentially through each surface S1 to S19 and is finally imaged on the imaging surface S19.

[0106] Table 9 shows the surface type, radius of curvature, thickness, and material of each lens in the optical imaging lens of Example 5, wherein the units for radius of curvature and thickness are millimeters (mm).

[0107] Table 9

[0108]

[0109] In Table 9, the object-side surface and image-side surface of any one of the following lenses—E2, E3, E4, E6, E7, and E8—are aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formulas:

[0110]

[0111] Where 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 higher-order term in the aspherical surface shape formula. Table 10 gives the conic coefficients and higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical surface in Example 10.

[0112] Table 10

[0113]

[0114] In Examples 1-5, each conditional expression satisfies the conditions in the table below:

[0115] Table 11

[0116]

[0117] A camera module includes at least an optical lens, in which the aforementioned high-pixel, small-volume panoramic fisheye optical system is installed. The advantages of high pixel count, large target area, ultra-wide angle, and small size make it compact, easy to manufacture and install, and further improve the imaging effect of the device paired with the system.

[0118] The above description provides one or more embodiments in conjunction with specific content, and does not imply that the specific implementation of the present invention is limited to these descriptions. Any methods or structures that are similar to or identical to those of the present invention, or any technical deductions or substitutions made based on the concept of the present invention, should be considered within the scope of protection of the present invention.

Claims

1. A high-pixel, small-volume panoramic fisheye optical system, comprising, sequentially 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 is convex, and its image side is concave. The second lens has negative optical power, its object side is convex, and its image side is concave. The third lens has positive optical power and its image-side surface is convex. The fourth lens has negative optical power, its object side is concave, and its image side is convex. The fifth lens has positive optical power, and its object side is convex, and its image side is convex. The sixth lens has positive optical power, and its object side is convex, and its image side is convex. The seventh lens has negative optical power, and its object side is concave, as is its image side. The sixth and seventh lenses constitute an adhesive lens; The eighth lens has positive optical power, its object side is convex, and its image side is concave. The optical system satisfies the following relationship: 0.88 < f34 / f567 < 1.0; -0.22 < f12 / f3 ≤ -0.09; Where f34 is the combined effective focal length of the third and fourth lenses, f567 is the combined effective focal length of the fifth, sixth and seventh lenses, f12 is the combined effective focal length of the first and second lenses, and f3 is the effective focal length of the third lens.

2. 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 / ℃; Where (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.

3. The high-pixel, small-volume panoramic fisheye optical system according to any one of claims 1-2, characterized in that: The optical system satisfies the following relationship: TTL / (D1*Ymax) < 1.0mm -1 ; Where 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.

4. The high-pixel, small-volume panoramic fisheye optical system according to any one of claims 1-2, characterized in that: The optical system satisfies the following relationship: (dn / dt)1 < 1.3 * 10 -06 / ℃; |R1 / R2| > 3.0; Where (dn / dt)1 is the temperature coefficient of refractive index of the first lens, R1 is the object curvature of the first lens, and R2 is the image curvature of the first lens.

5. The high-pixel, small-volume panoramic fisheye optical system according to any one of claims 1-2, characterized in that: The optical system satisfies the following relationship: (dn / dt)⁴ < -6.9 * 10⁻⁶ -06 / ℃; |R8 / R7| > 1.2; Where (dn / dt)4 is the temperature coefficient of refractive index of the fourth lens, R7 is the object curvature of the fourth lens, and R8 is the image curvature of the fourth lens.

6. The high-pixel, small-volume panoramic fisheye optical system according to any one of claims 1-2, characterized in that: The optical system satisfies the following relationship: |R11 / R13|<1.1; Where R11 is the object curvature of the sixth lens and R13 is the image curvature of the seventh lens.

7. The high-pixel, small-volume panoramic fisheye optical system according to any one of claims 1-2, characterized in that: The optical system satisfies the following relationship: f2 / f3 < -0.19; 0.9 < Nd2 / Nd3 < 1.1; Where f2 is the effective focal length of the second lens assembly, f3 is the effective focal length of the third lens, Nd2 is the refractive index constant of the second lens, and Nd3 is the refractive index constant of the third lens.

8. The high-pixel, small-volume panoramic fisheye optical system according to any one of claims 1-2, characterized in that: The optical system satisfies the following relationship: -1.44 < f6 / f7 < -1.08; Vd6 / Vd7 > 2.73; Where 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 constant of the material of the sixth lens, and Vd7 is the Abbe number constant of the material of the seventh lens.

9. A camera module, comprising at least an optical lens, characterized in that: The optical lens is equipped with the high-pixel, small-volume panoramic fisheye optical system as described in any one of claims 1-8.

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