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

Abstract

The utility model 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 panoramic VR / AR applications has gradually expanded, the application scenarios of fisheye lenses have also 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 pixels, small sensor chip target area, large size, and low image clarity. This type of lens design has become difficult to adapt to the gradually increasing usage needs of photography enthusiasts. Utility Model Content

[0003] This application aims to solve the technical problems of low pixels, small sensor chip target area, large volume and low imaging clarity commonly found in existing fisheye lenses, and provides a high-pixel and small-volume panoramic fisheye optical system with the advantages of high pixels, large target area, ultra-wide angle and small volume. It has a compact structure and is easy to process and install, further improving the imaging effect of the equipment used with this system.

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

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

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

[0007] The third lens has positive refractive power, and its image side surface is convex;

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

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

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

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

[0012] The sixth lens and the seventh lens constitute a cemented lens;

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

[0014] The high-pixel, small-volume panoramic fisheye optical system as described above 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.

[0015] 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.

[0016] The high-pixel, small-volume panoramic fisheye optical system as described above 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.

[0017] 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; where (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.

[0018] 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.

[0019] 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.

[0020] As described above, the high-pixel, small-volume panoramic fisheye optical system satisfies the following relationships: 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.

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

[0022] 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, small-volume panoramic fisheye optical system.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] 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 equipment used in the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments.

[0026] Figure 1 Schematic diagram of the structure of the optical system or camera module of Example 1 of the present application;

[0027] Figure 2 are the field curvature curve and distortion curve of the optical system or camera module in Example 1 of the present application;

[0028] Figure 3 2 is a schematic structural diagram of an optical system or camera module according to embodiment 2 of the present application;

[0029] Figure 4 are the field curvature curve and distortion curve of the optical system or camera module of Example 2 of the present application;

[0030] Figure 5 Schematic diagram of the structure of the optical system or camera module according to Example 3 of the present application;

[0031] Figure 6 are the field curvature curve and distortion curve of the optical system or camera module in Example 3 of the present application;

[0032] Figure 7 Schematic diagram of the structure of the optical system or camera module according to Example 4 of the present application;

[0033] Figure 8 are the field curvature curve and distortion curve of the optical system or camera module in Example 4 of the present application;

[0034] Figure 9 Schematic diagram of the structure of the optical system or camera module of Example 5 of the present application;

[0035] Figure 10 These are the field curvature curve and distortion curve of the optical system or camera module in Example 5 of the present application. DETAILED DESCRIPTION

[0036] like Figure 1-10 As shown, the present application provides a high-pixel, small-volume panoramic fisheye optical system, which includes 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;

[0037] The first lens has a negative optical power, its object-side surface is convex and its image-side surface is concave;

[0038] a second lens having negative optical power, the object-side surface of which is convex and the image-side surface of which is concave;

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

[0040] a fourth lens element having negative optical power, whose object-side surface is concave and whose image-side surface is convex;

[0041] a fifth lens element having positive refractive power, whose object-side surface and image-side surface are convex;

[0042] a sixth lens element having positive refractive power, whose object-side surface is convex and whose image-side surface is convex;

[0043] a seventh lens element having negative optical power, whose object-side surface and image-side surface are concave;

[0044] The eighth lens element has positive refractive power, its object-side surface is convex, and its image-side surface is concave.

[0045] The optical system of the embodiment of the present utility model 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 pixels, large target area, ultra-wide angle, and small size. It has a compact structure and is easy to process and install, further improving the imaging effect of the equipment matched 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 surface of the first lens element E1 to the image plane, D1 is the maximum effective diameter of the first lens element E1, and Ymax is the maximum image circle radius of the system. By limiting the maximum image circle and TTL size of the optical imaging system, the optical effective diameter of the first lens element and the total length of the optical system are defined. This ensures that the system meets the requirements of miniaturization, compact structure, and easy processing and installation, further improving the imaging effect of the equipment used in the system.

[0047] Furthermore, as a preferred embodiment of the present invention but not limiting, the optical system satisfies the following conditions: (dn / dt)1<1.3*10 -06 / °C; |R1 / R2|>3.0; where (dn / dt)1 is the refractive index temperature coefficient of the first lens element E1, R1 is the object-side curvature of the first lens element E1, and R2 is the image-side curvature of the first lens element E1. By controlling the radii of curvature of the object-side and image-side surfaces of the first lens element E1, the incident angle of the chief ray at the image plane in each field of view of the optical imaging lens can be relatively reasonably controlled, meeting the chief ray incident angle requirements of the optical system design. Combined with a positive refractive index temperature coefficient, temperature performance is effectively improved.

[0048] Furthermore, as a preferred embodiment of the present invention but not limiting, the optical system satisfies the following conditions: (dn / dt)4<-6.9*10 -06 / °C; |R8 / R7|>1.2; (dn / dt)4 is the refractive index temperature coefficient of the fourth lens element E4, R7 is the object-side curvature of the fourth lens element E4, and R8 is the image-side curvature of the fourth lens element E4. By controlling the radii of curvature of the object-side and image-side surfaces of the fourth lens element E4, the incident angle of the chief ray at the image plane in each field of view of the optical imaging lens can be relatively reasonably controlled, meeting the chief ray incident angle requirements of the optical system design. Furthermore, the combination with a negative refractive index temperature coefficient effectively improves temperature performance.

[0049] Furthermore, as a preferred embodiment of the present invention but not limiting, the optical system satisfies the following conditions: (dn / dt)6<-6.2*10 -06 / ℃,(dn / dt)7<-6.5*10 -06 / °C; |R11 / R13| <1.1; where (dn / dt)6 is the temperature coefficient of the refractive index of the sixth lens element E6, (dn / dt)7 is the temperature coefficient of the refractive index of the seventh lens element E7, R11 is the object-side curvature of the sixth lens element E6, and R13 is the image-side curvature of the seventh lens element E7. By controlling the radii of curvature of the object-side surface of the sixth lens element E6 and the image-side surface of the seventh lens element E7, the incident angle of the chief ray at the image plane in each field of view of the optical imaging lens can be relatively reasonably controlled, meeting the chief ray incident angle requirements of the optical system design. Furthermore, the combination with a negative temperature coefficient of refractive index further improves temperature performance.

[0050] Furthermore, 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. Where f2 is the effective focal length of the second lens element E2, f3 is the effective focal length of the third lens element E3, Nd2 is the material refractive index constant of the second lens element E2, and Nd3 is the material refractive index constant of the third lens element E3. By properly controlling the effective focal length ratio range of the cemented lens formed by combining the second lens element E2 with the third lens element E3, lens astigmatism can be effectively controlled, the effective diameter of components can be limited, the overall optical system size can be controlled, and the angle of incidence of light can be adjusted.

[0051] Furthermore, as a preferred embodiment of the present invention, but not limiting, 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 effective focal length ratio of the first lens E1, the second lens E2, and the third lens E3, the optical system can achieve a larger light incident angle and a larger light convergence angle, effectively reducing the overall optical length of the system.

[0052] Furthermore, as a preferred embodiment of the present invention, but not a limitation, 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 element E6, f7 is the effective focal length of the seventh lens element E7, Vd6 is the Abbe constant of the material of the sixth lens E6, and Vd7 is the Abbe 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 system effectively reduces positional chromatic aberration and lateral chromatic aberration.

[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 element E3 and the fourth lens element E4, and f567 is the combined effective focal length of the fifth lens element E5, the sixth lens element E6, and the seventh lens element E7. By controlling the effective focal length ratios of the third lens element E3, the fourth lens element E4, the fifth lens element E5, and the sixth lens element E6 and the seventh lens element E7, the height of the light beam exiting the optical system is controlled, thereby reducing higher-order aberrations and the outer diameter of the lens elements. Furthermore, while controlling costs, the use of an aspheric surface in conjunction with the fourth lens element E4 can better correct system distortion and reduce astigmatism to meet customer requirements for pixel density.

[0054] Example 1

[0055] The following reference Figures 1 to 2 The optical imaging lens according to Example 1 of the present application is described. Figure 1 A schematic structural diagram of an optical imaging lens according to Example 1 of the present application is shown.

[0056] 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.

[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 through the surfaces S1 to S19 in sequence and is finally imaged on the image surface S19.

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

[0059] Table 1

[0060]

[0061] In Table 1, the object side and image side of any 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. The surface shape of each aspherical lens can be defined by, but is not limited to, the following aspherical surface formula:

[0062]

[0063] Where x is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the aspheric vertex, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th higher-order term in the aspheric surface shape formula. Table 2 shows the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, and A24 for various aspheric surfaces that can be used in Example 1.

[0064] Table 2

[0065]

[0066] Example 2

[0067] The following reference Figures 3 and 4 The optical imaging lens according to Example 2 of the present application is described. Figure 3 A schematic structural diagram of an optical imaging lens according to Example 2 of the present application is shown.

[0068] like Figure 3 As shown, the optical imaging lens according to an exemplary embodiment of the present application includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, STO, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9 and an imaging surface S19.

[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 through the surfaces S1 to S19 in sequence and is finally imaged on the image surface S19.

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

[0071] Table 3

[0072]

[0073] In Table 3, 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:

[0074]

[0075] Where x is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the aspheric vertex, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th higher-order term in the aspheric surface shape formula. Table 4 shows the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 for various aspheric surfaces that can be used in Example 2.

[0076] Table 4

[0077]

[0078] Example 3:

[0079] The following reference Figures 5 and 6 The optical imaging lens according to Example 3 of the present application is described. Figure 5 A schematic structural diagram of an optical imaging lens according to Example 3 of the present application is shown.

[0080] 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.

[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 through the surfaces S1 to S19 in sequence and is finally imaged on the image surface S19.

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

[0083] Table 5

[0084]

[0085] In Table 5, the object side and image side of any 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. The surface shape of each aspherical lens can be defined by, but is not limited to, the following aspherical surface formula:

[0086]

[0087] Where x is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the aspheric vertex, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th higher-order term in the aspheric surface shape formula. Table 6 shows the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 for various aspheric surfaces that can be used in Example 3.

[0088] Table 6

[0089]

[0090] Example 4:

[0091] The following reference Figures 7 and 8 The optical imaging lens according to Example 3 of the present application is described. Figure 7 A schematic structural diagram of an optical imaging lens according to Example 4 of the present application is shown.

[0092] 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.

[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 through the surfaces S1 to S19 in sequence and is finally imaged on the image surface S19.

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

[0095] Table 7

[0096]

[0097] In Table 7, the object side and image side of any 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. The surface shape of each aspherical lens can be defined by, but is not limited to, the following aspherical surface formula:

[0098]

[0099] Where x is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the aspheric vertex, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th higher-order term in the aspheric surface shape formula. Table 8 shows the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, and A24 for various aspheric surfaces that can be used in Example 4.

[0100] Table 8

[0101]

[0102] Example 5

[0103] The following reference Figures 9 and 10 The optical imaging lens according to Example 5 of the present application is described. Figure 9 A schematic structural diagram of an optical imaging lens according to Example 5 of the present application is shown.

[0104] like Figure 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.

[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 through the surfaces S1 to S19 in sequence and is finally imaged on the image surface S19.

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

[0107] Table 9

[0108]

[0109] In Table 9, the object side and image side of any of the second lens element E2, the third lens element E3, the fourth lens element E4, the sixth lens element E6, the seventh lens element E7, and the eighth lens element E8 are aspherical surfaces. The surface shape of each aspherical lens element can be defined by, but is not limited to, the following aspherical surface formula:

[0110]

[0111] Where x is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the aspheric vertex, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th higher-order term in the aspheric surface shape formula. Table 10 lists the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 for various aspheric surfaces that can be used in Example 10.

[0112] Table 10

[0113]

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

[0115] Table 11

[0116]

[0117] A camera module includes at least 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 area, ultra-wide angle and small volume, compact structure, and is easy to process and install, further improving the imaging effect of the equipment used with the system.

[0118] The above descriptions are provided in conjunction with specific content to provide one or more implementation methods, and do not limit the specific implementation of the present invention to these descriptions. Any similarity or similarity with the methods, structures, etc. of the present invention, or any technical deduction or substitution based on the concept of the present invention, shall be deemed to be within the scope of protection of the present invention.

Claims

1. A high-pixel, small-volume panoramic fisheye optical system comprising, in order from the object plane to the image plane along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, characterized in that: The first lens has negative optical power, its object side surface is convex, and its image side surface is concave; The second lens has negative optical power, 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.

2. The high-pixel, 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: 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.

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, 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: (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.

8. 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: 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 combination, Nd2 is the material refractive index constant of the second lens, and Nd3 is the material refractive index constant of the third lens combination.

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 Abbe number constant of the material of the sixth lens, and Vd7 is the Abbe number constant of the material of the seventh lens.

10. 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 according to any one of claims 1 to 9.

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