Wide-angle optical system and camera module applied by same

Abstract

The utility model provides a wide-angle optical system and a camera module applying the wide-angle optical system, and the wide-angle optical system is mainly composed of eight lenses, the first lens has negative focal power, the object side surface of the first lens is a convex surface, the image side surface of the first lens is a concave surface, the second lens has negative focal power, the image side surface of the second lens is a concave surface, the third lens has focal power, the object side surface of the third lens is a concave surface, and the fourth lens has focal power. The fifth lens has focal power, the object side surface of the fifth lens is a convex surface, the sixth lens has positive focal power, the object side surface of the sixth lens is a convex surface, the image side surface of the sixth lens is a convex surface, the seventh lens has negative focal power, the object side surface of the seventh lens is a concave surface, and the eighth lens has positive focal power and the image side surface of the eighth lens is a concave surface. The optical system has the advantages of light weight, high pixel, large wide angle, small caliber and low cost, is compact in structure and convenient to process and mount, can keep good and stable performance at high and low temperatures, and effectively meets the design requirements of large field angle and high resolution of the optical system.

Description

Technical Field

[0001] The present application relates to the field of optics, and in particular provides a wide-angle optical system and a camera module using the same. Background Art

[0002] In recent years, with technological advancements and the growth of mobile internet, people are pursuing diversified imaging effects and optical lenses that can produce high-quality images across a wider field of view. Consequently, optical imaging lenses have rapidly developed and are now widely used in various fields, including smartphones, tablets, video conferencing, in-vehicle monitoring, security surveillance, and intelligent transportation systems. However, currently available imaging lenses are unable to withstand complex environments such as vibration, high temperature, and high humidity. Therefore, designing and manufacturing wide-angle lenses that are lightweight, provide clear images, and maintain excellent and stable performance in harsh environments is of great significance. Utility Model Content

[0003] The present application aims to provide a lightweight, high-quality wide-angle optical system with the advantages of high pixels, large wide angle, small aperture and low cost. It has a compact structure, is easy to process and install, and can maintain good and stable performance of the wide-angle lens at high and low temperatures, which can meet the needs of multiple fields.

[0004] A wide-angle optical system comprises, 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;

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

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

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

[0008] The fourth lens has optical power and its image side surface is convex;

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

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

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

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

[0013] The wide-angle optical system as described above satisfies the following relationship: -3.0 <f234 / f678<3.0;

[0014] Wherein, f234 is the effective combined focal length of the second lens, the third lens, and the fourth lens, and f678 is the effective combined focal length of the sixth lens, the seventh lens, and the eighth lens.

[0015] The wide-angle optical system as described above satisfies the following relationship: |f2 / f|<8.0;

[0016] | f3 / f |<7.0;

[0017] | f4 / f |<5.0;

[0018] Wherein, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, and f4 is the effective focal length of the fourth lens.

[0019] The wide-angle optical system as described above satisfies the following relationship: TTL / f<12;

[0020] Wherein, f is the effective focal length of the optical system, and TTL is the on-axis distance from the object side of the first lens to the imaging surface.

[0021] As described above, the wide-angle optical system satisfies the following relationship: 15.0 <TTL / EPD<23.0;

[0022] Wherein, TTL is the on-axis distance from the object side of the first lens to the imaging surface, and EPD is the entrance pupil diameter of the optical system.

[0023] The wide-angle optical system as described above satisfies the following relationship: | R11 / R12 |<4.5;

[0024] | R31 / R32 |<3.3;

[0025] | R41 / R42 |<2.5;

[0026] | R51 / R52 |<2.7;

[0027] Among them, R11 is the curvature radius of the object side of the first lens, R12 is the curvature radius of the image side of the first lens; R31 is the curvature radius of the object side of the third lens, R32 is the curvature radius of the image side of the third lens; R41 is the curvature radius of the object side of the fourth lens, R42 is the curvature radius of the image side of the fourth lens; R51 is the curvature radius of the object side of the fifth lens, R52 is the curvature radius of the image side of the fifth lens.

[0028] The wide-angle optical system as described above satisfies the following relationship: nd1>1.7, vd1<50;

[0029] nd2>1.5,vd2<60;

[0030] nd3 >1.5,vd3<40;

[0031] nd4<1.9, vd4<60;

[0032] nd5<1.7, vd5<65;

[0033] nd6<1.65, vd6>45;

[0034] nd7<1.7, vd7<40;

[0035] nd8<1.65, vd8>45;

[0036] Among them, nd1 is the refractive index of the first lens, vd1 is the Abbe number of the first lens; nd2 is the refractive index of the second lens, vd2 is the Abbe number of the second lens; nd3 is the refractive index of the third lens, vd3 is the Abbe number of the third lens; nd4 is the refractive index of the fourth lens, vd4 is the Abbe number of the fourth lens; nd5 is the refractive index of the fifth lens, vd5 is the Abbe number of the fifth lens, nd6 is the refractive index of the sixth lens, vd6 is the Abbe number of the sixth lens, nd7 is the refractive index of the seventh lens, vd7 is the Abbe number of the seventh lens, nd8 is the refractive index of the seventh lens, vd8 is the Abbe number of the seventh lens.

[0037] The wide-angle optical system as described above satisfies the following relationship: CT3 / ET3<2.0;

[0038] CT4 / ET4<4.0;

[0039] CT5 / ET5<3.0;

[0040] Among them, CT3 is the center thickness of the third lens, ET3 is the edge thickness of the third lens; CT4 is the center thickness of the fourth lens, ET4 is the edge thickness of the fourth lens; CT5 is the center thickness of the fifth lens, ET5 is the edge thickness of the fifth lens.

[0041] The wide-angle optical system as described above satisfies the following relationship: -3.0<f*tan(FOV) / (DT1 / 2)<0;

[0042] -6.0<f*tan(FOV) / (DT3 / 2)<-3.0;

[0043] Wherein, f is the effective focal length of the optical system, FOV is half of the maximum field of view of the optical system, DT1 is the effective half-aperture of the object side of the first lens, and DT3 is the effective half-aperture of the object side of the third lens.

[0044] On the other hand, an embodiment of the present application further provides a camera module, which includes at least an optical lens, in which the above-mentioned wide-angle optical system is installed.

[0045] Compared with the prior art, the present invention has the following advantages:

[0046] The present application provides a wide-angle 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 has the advantages of lightness, high pixel, wide angle, small aperture and low cost. It has a compact structure and is easy to process and install. It can maintain good and stable performance at high and low temperatures, effectively meeting the design requirements of the optical system for a larger field of view and high resolution, and can be used in multiple fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] 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.

[0048] Figure 1 Schematic diagram of the structure of the optical system or camera module of Example 1 of the present application;

[0049] Figure 2 are the field curvature curve and f-θ distortion curve of the optical system or camera module of Example 1 of the present application;

[0050] Figure 3 2 is a schematic structural diagram of an optical system or camera module according to embodiment 2 of the present application;

[0051] Figure 4 are the field curvature curve and f-θ distortion curve of the optical system or camera module of Example 2 of the present application;

[0052] Figure 5 Schematic diagram of the structure of the optical system or camera module according to Example 3 of the present application;

[0053] Figure 6 These are the field curvature curve and f-θ distortion curve of the optical system or camera module in Example 3 of the present application. DETAILED DESCRIPTION

[0054] like Figure 1-6 As shown, the present application provides a wide-angle 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;

[0055] The first lens has negative optical power, its object side surface is convex, and its image side surface is concave;

[0056] The second lens has negative optical power and its image side surface is concave;

[0057] The third lens has a focal power, and its object side is concave;

[0058] The fourth lens has a focal power, and its image side is convex;

[0059] The fifth lens has a focal power, and its object side is convex;

[0060] The sixth lens has a positive focal power, its object side is convex, and its image side is convex;

[0061] The seventh lens has a negative focal power, and its object side is concave;

[0062] The eighth lens has a positive focal power, and its image side is concave.

[0063] The optical system according to the embodiment of the present invention is mainly composed of eight lenses. Through reasonable matching of the lens shapes and focal powers, it has the advantages of being lightweight, high-pixel, large wide-angle, small aperture and low cost. It has a compact structure, is convenient for processing and installation, can maintain good and stable performance at high and low temperatures, effectively meets the design requirements of a large field angle and high resolution of the optical system, and can meet the use in multiple fields.

[0064] Further, as a preferred embodiment of the present invention rather than a limitation, the optical system satisfies the following condition: TTL / f < 12, where f is the effective focal length of the optical imaging system, and TTL is the axial distance from the object side of the first lens to the imaging surface. By reasonably balancing the relationship between the effective focal length of the optical imaging system and TTL of the optical imaging system, the size of the optical imaging system can be effectively compressed while meeting the requirement of an ultra-large wide angle.

[0065] Further, as a preferred embodiment of the present invention rather than a limitation, the optical system satisfies the following condition: 15.0 < TTL / EPD < 23.0; where TTL is the axial distance from the object side of the first lens to the imaging surface, and EPD is the entrance pupil diameter of the optical imaging lens. By effectively controlling the range of the ratio of TTL to the entrance pupil diameter of the optical imaging system, the light passing amount can be increased while meeting the requirement of a smaller structural size.

[0066] Furthermore, as a preferred embodiment of the present invention but not limiting, the optical system satisfies the following conditions: | R11 / R12 | < 4.5, | R31 / R32 | < 3.3, | R41 / R42 | < 2.5, | R51 / R52 | < 2.7, wherein R11 is the radius of curvature of the object side of the first lens, and R12 is the radius of curvature of the image side of the first lens; R31 is the radius of curvature of the object side of the third lens, and R32 is the radius of curvature of the image side of the third lens; R41 is the radius of curvature of the object side of the fourth lens, and R42 is the radius of curvature of the image side of the fourth lens; R51 is the radius of curvature of the object side of the fifth lens, and R52 is the radius of curvature of the image side of the fifth lens. By controlling the relationship between the radius of curvature between the object side surface and the image side surface, the astigmatism generated by each lens can be balanced, the aberration can be corrected, and the imaging quality of the optical system can be improved. At the same time, the light angle between each lens is controlled to reduce the imaging ghost between the lenses, thereby achieving the improvement of ghost images.

[0067] Furthermore, as a preferred embodiment of the present invention but not limiting, the optical system satisfies the following conditions: nd1>1.7, vd1<50, nd2>1.5, vd2<60, nd3>1.5, vd3<40, nd4<1.9, vd4<60, nd5<1.7, vd5<65, nd6<1.65, vd6>45, nd7<1.7, vd7<40, nd8<1.65, vd8>45, wherein nd1 is the refractive index of the first lens, vd1 is the Abbe number of the first lens; nd2 is the refractive index of the second lens, vd2 is the Abbe number of the second lens; nd3 is the refractive index of the third lens The refractive index of each lens, vd3, is the Abbe number of the third lens; nd4 is the refractive index of the fourth lens, vd4 is the Abbe number of the fourth lens; nd5 is the refractive index of the fifth lens, vd5 is the Abbe number of the fifth lens; nd6 is the refractive index of the sixth lens, vd6 is the Abbe number of the sixth lens; nd7 is the refractive index of the seventh lens, vd7 is the Abbe number of the seventh lens; nd8 is the refractive index of the seventh lens, vd8 is the Abbe number of the seventh lens. By properly controlling the refractive index and Abbe number of each lens, lens aberrations are corrected and the lens's resolving power is improved. Furthermore, the stability of optical imaging performance is guaranteed to the greatest extent possible under high and low temperature conditions.

[0068] Further, as a preferred embodiment of the present invention rather than a limitation, the optical system satisfies the following conditions: |f2 / f| < 8.0, |f3 / f| < 7.0, |f4 / f| < 5.0. Wherein, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, and f4 is the effective focal length of the fourth lens. By limiting the ratio of the effective focal lengths of the second lens, the third lens, and the fourth lens to the effective focal length of the optical system, a reasonable light deflection angle is obtained for the optical imaging system, the sensitivity to component tolerances is effectively reduced, and the quality of the optical imaging system is improved.

[0069] Further, as a preferred embodiment of the present invention rather than a limitation, the optical system satisfies the following conditions: CT3 / ET3 < 2.0, CT4 / ET4 < 4.0, CT5 / ET5 < 3.0, where CT3 is the central thickness of the third lens, ET3 is the edge thickness of the third lens; CT4 is the central thickness of the fourth lens, ET4 is the edge thickness of the fourth lens; CT5 is the central thickness of the fifth lens, and ET5 is the edge thickness of the fifth lens. By controlling the relationship between the central thickness and the edge thickness of the third lens, the fourth lens, and the fifth lens, the processing difficulty of each lens can be reasonably controlled, which is beneficial to the processing and forming of the lens and the control of costs. At the same time, the field curvature generated by the optical imaging system is controlled, which is beneficial to the improvement of imaging quality.

[0070] Further, as a preferred embodiment of the present invention rather than a limitation, the optical system satisfies the following conditions: -3.0 < f*tan(FOV) / (DT1 / 2) < 0, -6.0 < f*tan(FOV) / (DT3 / 2) < -3.0, where f is the effective focal length of the optical system, FOV is half of the maximum field angle of the imaging system of the optical system, DT1 is the effective semi-aperture of the object side of the first lens, and DT3 is the effective semi-aperture of the object side of the third lens. By effectively controlling the relationship between the focal length, half of the maximum field angle, and the lens aperture, the size of the system can be effectively compressed, the characteristic of a large wide angle can be realized, and at the same time, the aperture of the optical imaging system can be effectively controlled. In addition, the distortion can be effectively reduced, and the optical imaging quality can be improved.

[0071] Further, as a preferred embodiment of the present invention rather than a limitation, the optical system satisfies the following conditions: -3.0 < f234 / f678 < 3.0; where f234 is the effective combined focal length of the second lens, the third lens, and the fourth lens, and f678 is the effective combined focal length of the sixth lens, the seventh lens, and the eighth lens. By controlling the combined focal length between the lenses within a reasonable range, the spherical aberration generated by the entire system can be balanced, and then the spherical aberration of the system can be controlled, which is beneficial to improving the imaging quality of the system.

[0072] Further, as a preferred embodiment of the present invention rather than a limitation, the optical system satisfies the following conditions: 3.5 < TTL / ImagH < 6.5; where TTL is the axial distance from the object side surface of the first lens to the imaging surface, and ImagH is half of the diagonal length of the effective pixel area on the imaging surface. By controlling the relationship between the total length of the optical system and the imaging area, it is beneficial to increase the field of view angle and at the same time miniaturize the high-pixel wide-angle lens. Specific embodiments:

[0074] Embodiment 1:

[0075] The following refers to Figures 1 to 2 Describe the optical imaging lens according to Embodiment 1 of the present application. Figure 1 Fig. shows a schematic structural diagram of the optical imaging lens according to Embodiment 1 of the present application.

[0076] As Figure 1 shown, the optical imaging lens according to an exemplary embodiment of the present application sequentially includes, along the optical axis from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, an aperture STO, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an imaging surface S19.

[0077] The first lens E1 has a negative optical power, its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has a negative optical power, its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has a negative optical power, its object side surface S5 is concave, and its image side surface S6 is convex. The fourth lens E4 has a positive optical power, its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has a negative optical power, its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has a positive optical power, its object side surface S12 is convex, and its image side surface S13 is convex. The seventh lens E7 has a negative optical power, its object side surface S13 is concave, and its image side surface S14 is convex. The eighth lens E8 has a positive optical power, 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 sequentially passes through the surfaces S1 to S18 and finally forms an image on the imaging surface S19.

[0078] Table 1 shows the surface types, curvature radii, thicknesses, and materials of the lenses of the optical imaging lens in Embodiment 1, where the units of the curvature radii and thicknesses are both millimeters (mm).

[0079] Table 1

[0080]

[0081] In Table 1, 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 fifth lens element E5, the sixth lens element E6, the seventh lens element E7, and the eighth lens element E8 are aspherical surfaces. The surface shape of each aspherical lens element can be defined by, but is not limited to, the following aspherical surface formula:

[0082]

[0083] 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, and A20 for various aspheric surfaces that can be used in the first embodiment.

[0084] Table 2

[0085]

[0086] Example 2

[0087] 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.

[0088] 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, an aperture STO, a sixth lens E6, a seventh lens E7, a seventh lens E8, a filter E9 and an imaging surface S19.

[0089] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being concave and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being convex. The sixth lens E6 has positive optical power, with its object-side surface S12 being convex and its image-side surface S13 being convex. The seventh lens E7 has negative optical power, with its object-side surface S13 being concave and its image-side surface S14 being concave. The eighth lens E8 has positive optical power, with its object-side surface S15 being convex and its image-side surface S16 being concave. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0090] 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).

[0091] Table 3

[0092]

[0093] In Table 3, the object side and image side of any one of the second lens element E2, the third lens element E3, the fifth lens element E5, the sixth lens element E6, the seventh lens element E7, and the eighth lens element E8 are aspherical surfaces. The surface shape of the aspherical lens element can be defined by, but is not limited to, the following aspherical surface formula:

[0094]

[0095] Where x is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the aspheric vertex, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th higher-order term in the aspheric surface shape formula. Table 4 shows the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 for various aspheric surfaces that can be used in the second embodiment.

[0096] Table 4

[0097]

[0098] Example 3:

[0099] 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.

[0100] 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, an aperture STO, a sixth lens E6, a seventh lens E7, a seventh lens E8, a filter E9 and an imaging surface S19.

[0101] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being concave and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being convex. The sixth lens E6 has positive optical power, with its object-side surface S12 being convex and its image-side surface S13 being convex. The seventh lens E7 has negative optical power, with its object-side surface S13 being concave and its image-side surface S14 being concave. The eighth lens E8 has positive optical power, with its object-side surface S15 being convex and its image-side surface S16 being concave. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0102] 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).

[0103] Table 5

[0104]

[0105] In Table 5, the object side and image side of any of the second lens element E2, the third lens element E3, the fifth lens element E5, the sixth lens element E6, the seventh lens element E7, and the eighth lens element E8 are aspherical surfaces. The surface shape of each aspherical lens element can be defined by, but is not limited to, the following aspherical surface formula:

[0106]

[0107] Where x is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the aspheric vertex, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th higher-order term in the aspheric surface shape formula. Table 6 shows the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, and A16 for various aspheric surfaces that can be used in the first embodiment.

[0108] Table 6

[0109]

[0110] In Examples 1-3, each conditional expression satisfies the conditions in the following table:

[0111] Table 7

[0112]

[0113] A camera module includes at least an optical lens, in which the above-mentioned wide-angle optical system is installed. The camera module has the advantages of being light, high-pixel, wide-angle, small-aperture and low-cost. It has a compact structure, is easy to process and install, can maintain good and stable performance at high and low temperatures, effectively meets the design requirements of the optical system for a larger field of view and high resolution, and can be used in multiple fields.

[0114] 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 wide-angle optical system comprising, in order from the object plane to the image plane along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, characterized in that: The first lens has negative optical power, its object side surface is convex, and its image side surface is concave; The second lens has negative optical power and its image side surface is concave; The third lens has optical power and its object side surface is concave; The fourth lens has optical power and its image side surface is convex; The fifth lens has optical power and its object side surface is convex; The sixth lens has positive refractive power, and its object-side surface is convex, and its image-side surface is convex; The seventh lens has negative optical power, and its object side surface is concave; The eighth lens has positive refractive power and its image side surface is concave; The optical system satisfies the following relationship: -3.0 < f234 / f678 < 3.0; Wherein, f234 is the effective combined focal length of the second lens, the third lens, and the fourth lens, and f678 is the effective combined focal length of the sixth lens, the seventh lens, and the eighth lens.

2. The wide-angle optical system according to claim 1, wherein: The optical system satisfies the following relationship: |f2 / f| < 8.0; and / or | f3 / f |< 7.0; and / or | f4 / f |< 5.0; and / or Wherein, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, and f4 is the effective focal length of the fourth lens.

3. The wide-angle optical system according to any one of claims 1 to 2, wherein: The optical system satisfies the following relationship: TTL / f < 12; Wherein, f is the effective focal length of the optical system, and TTL is the on-axis distance from the object side of the first lens to the imaging surface.

4. The wide-angle optical system according to any one of claims 1 to 2, wherein: The optical system satisfies the following relationship: 15.0 < TTL / EPD < 23.0; Wherein, TTL is the on-axis distance from the object side of the first lens to the imaging surface, and EPD is the entrance pupil diameter of the optical system.

5. The wide-angle optical system according to any one of claims 1 to 2, wherein: The optical system satisfies the following relationship: | R11 / R12 | < 4.5; and / or | R31 / R32 | < 3.3; and / or | R41 / R42 | < 2.5; and / or | R51 / R52 | < 2.7; Among them, R11 is the curvature radius of the object side of the first lens, R12 is the curvature radius of the image side of the first lens; R31 is the curvature radius of the object side of the third lens, R32 is the curvature radius of the image side of the third lens; R41 is the curvature radius of the object side of the fourth lens, R42 is the curvature radius of the image side of the fourth lens; R51 is the curvature radius of the object side of the fifth lens, R52 is the curvature radius of the image side of the fifth lens.

6. The wide-angle optical system according to any one of claims 1 to 2, wherein: The optical system satisfies the following relationship: nd1>1.7, vd1<50; and / or nd2>1.5,vd2<60;and / or nd3 > 1.5, vd3 < 40; and / or nd4 <1.9, vd4 <60; and / or nd5 <1.7, vd5 <65; and / or ND6 <1.65, VD6 >45; and / or nd7 < 1.7, vd7 < 40; and / or nd8 <1.65, vd8>45; Among them, nd1 is the refractive index of the first lens, vd1 is the Abbe number of the first lens; nd2 is the refractive index of the second lens, vd2 is the Abbe number of the second lens; nd3 is the refractive index of the third lens, vd3 is the Abbe number of the third lens; nd4 is the refractive index of the fourth lens, vd4 is the Abbe number of the fourth lens; nd5 is the refractive index of the fifth lens, vd5 is the Abbe number of the fifth lens, nd6 is the refractive index of the sixth lens, vd6 is the Abbe number of the sixth lens, nd7 is the refractive index of the seventh lens, vd7 is the Abbe number of the seventh lens, nd8 is the refractive index of the seventh lens, vd8 is the Abbe number of the seventh lens.

7. The wide-angle optical system according to any one of claims 1 to 2, wherein: The optical system satisfies the following relationship: CT3 / ET3 < 2.0; and / or CT4 / ET4 < 4.0; and / or CT5 / ET5 < 3.0; Among them, CT3 is the center thickness of the third lens, ET3 is the edge thickness of the third lens; CT4 is the center thickness of the fourth lens, ET4 is the edge thickness of the fourth lens; CT5 is the center thickness of the fifth lens, ET5 is the edge thickness of the fifth lens.

8. The wide-angle optical system according to any one of claims 1 to 2, wherein: The optical system satisfies the following relationship: -3.0<f*tan(FOV) / (DT1 / 2)<0; and / or -6.0<f*tan(FOV) / (DT3 / 2)<-3.0; Wherein, f is the effective focal length of the optical system, FOV is half of the maximum field of view of the optical system, DT1 is the effective half-aperture of the object side of the first lens, and DT3 is the effective half-aperture of the object side of the third lens.

9. A camera module, comprising at least an optical lens, characterized in that: The wide-angle optical system according to any one of claims 1 to 8 is installed in the optical lens.

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