Wide-angle optical system and camera module applying same

Abstract

The invention 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 the advancement of science and technology and the development of mobile Internet, people are pursuing diversified imaging effects and optical lenses that can present better imaging quality within a larger field of view. Therefore, optical imaging lenses have developed rapidly and have been widely used in various fields such as smart phones, tablets, video conferencing, vehicle monitoring, security monitoring, and intelligent transportation systems. However, the imaging lenses currently on the market can no longer meet the requirements of use in complex environments such as vibration, high temperature and high humidity. Therefore, it is of great significance to design and manufacture wide-angle lenses that are lightweight, have clear images, and can continue to maintain good and stable performance in harsh environments. Summary of the invention

[0003] The present application aims to provide a lightweight, high-image-quality wide-angle optical system having the advantages of high pixels, large wide angle, small aperture and low cost, compact structure, easy processing and installation, and a wide-angle lens that can maintain good and stable performance at high and low temperatures, which can meet the needs of use in multiple fields.

[0004] A wide-angle optical system, which is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens in sequence from an object plane to an image plane along an optical axis; The first lens has negative optical power, its object side surface is convex, and its image side surface is concave; The second lens has negative optical power, 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.

[0005] The wide-angle optical system as described above satisfies the following relationship: -3.0 <f234 / f678<3.0; Among them, 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.

[0006] The wide-angle optical system as described above satisfies the following relationship: | f2 / f |<8.0; | f3 / f |<7.0; |f4 / f|<5.0; Among them, 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.

[0007] The wide-angle optical system as described above satisfies the following relationship: TTL / f<12; Wherein, f is the effective focal length of the optical system, and TTL is the axial distance from the object side of the first lens to the imaging surface.

[0008] The wide-angle optical system as described above satisfies the following relationship: 15.0 <TTL / EPD<23.0; Wherein, 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 system.

[0009] The wide-angle optical system as described above satisfies the following relationship: | R11 / R12 |<4.5; | R31 / R32 |<3.3; | R41 / R42 |<2.5; | 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.

[0010] The wide-angle optical system as described above satisfies the following relationship: 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; 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.

[0011] The wide-angle optical system as described above satisfies the following relationship: CT3 / ET3<2.0; CT4 / ET4<4.0; 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.

[0012] The wide-angle optical system as described above satisfies the following relationship: -3.0<f*tan(FOV) / (DT1 / 2)<0; -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.

[0013] On the other hand, an embodiment of the present application further provides a camera module, which at least includes an optical lens, in which the above-mentioned wide-angle optical system is installed.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 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 a larger field of view and high resolution for the optical system, and can be used in multiple fields. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0016] Figure 1 It is a structural schematic diagram of the optical system or camera module of Example 1 of the present application; Figure 2 is a field curvature curve and an f-θ distortion curve of the optical system or camera module of Example 1 of the present application; Figure 3 It is a structural schematic diagram of an optical system or a camera module according to Embodiment 2 of the present application; Figure 4 It is a field curvature curve and an f-θ distortion curve of the optical system or camera module of Example 2 of the present application; Figure 5 It is a structural schematic diagram of an optical system or a camera module according to Embodiment 3 of the present application; Figure 6 It is 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

[0017] like Figure 1-6 As shown, the present application provides a wide-angle optical system, which is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens in sequence from the object plane to the image plane along the optical axis; The first lens has negative optical power, its object side surface is convex, and its image side surface is concave; The second lens has negative optical power, 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.

[0018] The optical system of the embodiment of the present invention is mainly composed of 8 lenses. Through the reasonable combination of lens shape and optical focal length, it 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 a larger field of view and high resolution for the optical system, and can be used in multiple fields.

[0019] 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 surface of the first lens to the imaging surface. By reasonably balancing the relationship between the effective focal length of the optical imaging system and the TTL of the optical imaging system, the size of the optical imaging system can be effectively compressed while meeting the requirement of an ultra-wide angle.

[0020] 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 surface 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.

[0021] Further, as a preferred embodiment of the present invention rather than a limitation, the optical system satisfies the following conditions: |R11 / R12| < 4.5, |R31 / R32| < 3.3, |R41 / R42| < 2.5, |R51 / R52| < 2.7, where R11 is the curvature radius of the object side surface of the first lens, R12 is the curvature radius of the image side surface of the first lens; R31 is the curvature radius of the object side surface of the third lens, R32 is the curvature radius of the image side surface of the third lens; R41 is the curvature radius of the object side surface of the fourth lens, R42 is the curvature radius of the image side surface of the fourth lens; R51 is the curvature radius of the object side surface of the fifth lens, R52 is the curvature radius of the image side surface of the fifth lens. By controlling the relationship between the curvature radii of the object side surface and the image side surface, the astigmatism generated by each lens can be balanced, the aberration can be corrected, which is beneficial to improving the imaging quality of the optical system. At the same time, the light angles between the lenses are controlled to reduce the imaging ghosting between the lenses, thereby improving the ghost image.

[0022] Further, 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, vd4 is the Abbe number of the third lens; The refractive index of the 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 reasonably controlling the refractive index and Abbe number of each lens, the aberration generated by the lens is corrected and the resolution of the lens is improved. In addition, the stability of optical imaging performance under high and low temperatures is guaranteed to the greatest extent.

[0023] Further, as a preferred embodiment of the present invention but not limiting, 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, the optical imaging system obtains a reasonable light deflection angle, effectively reduces the sensitivity of component tolerances, and improves the quality of the optical imaging system.

[0024] Further, as a preferred embodiment of the present invention but not limiting, the optical system satisfies the following conditions: CT3 / ET3<2.0, CT4 / ET4<4.0, CT5 / ET5<3.0, wherein CT3 is the center thickness of the third lens, and ET3 is the edge thickness of the third lens; CT4 is the center thickness of the fourth lens, and ET4 is the edge thickness of the fourth lens; CT5 is the center thickness of the fifth lens, and ET5 is the edge thickness of the fifth lens. By controlling the relationship between the center thickness and 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 molding of the lens and the control of the cost, and at the same time, the field curvature generated by the optical imaging system is controlled, which is beneficial to the improvement of the imaging quality.

[0025] 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 of view angle of the imaging system of the optical system, DT1 is the effective semi-aperture of the object side surface of the first lens, and DT3 is the effective semi-aperture of the object side surface of the third lens. By effectively controlling the relationship between the focal length, half of the maximum field of view angle, and the lens aperture, the size of the system can be effectively compressed, the characteristics of a large wide angle can be achieved, and at the same time, the aperture of the optical imaging system can be effectively controlled. In addition, distortion can be effectively reduced, and the optical imaging quality can be improved.

[0026] 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, third, and fourth lenses, and f678 is the effective combined focal length of the sixth, seventh, and eighth lenses. By controlling the combined focal length between the lenses within a reasonable range, it is possible to balance the spherical aberration generated by the entire system, and then control the spherical aberration of the system, which is beneficial to improving the imaging quality of the system.

[0027] 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 on-axis 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 realize the miniaturization of a high-pixel wide-angle lens. Specific embodiments: Embodiment 1: The following refers to Figure 1 to Figure 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.

[0029] As Figure 1 shown, the optical imaging lens according to the exemplary embodiment of the present application sequentially includes, along the optical axis from the object side to the image side: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a diaphragm STO, a sixth lens E6, a seventh lens E7, a seventh lens E8, a filter E9, and an imaging surface S19.

[0030] The first lens E1 has negative focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has negative focal power, and its object side surface S5 is concave, and its image side surface S6 is convex. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has negative focal power, and its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has positive focal power, and its object side surface S12 is convex, and its image side surface S13 is convex. The seventh lens E7 has negative focal power, and its object side surface S13 is concave, and its image side surface S14 is convex. The eighth lens E8 has positive focal power, and its object side surface S15 is convex, and its image side surface S16 is concave. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0031] Table 1 shows the surface type, curvature radius, thickness and material of each lens of the optical imaging lens of Example 1, wherein the units of the curvature radius and thickness are both millimeters (mm).

[0032] Table 1

[0033] In Table 1, the object side surface and the image side surface of any one of the second lens E2, the third lens E3, the fourth lens E4, the fifth lens E5, the sixth lens E6, the seventh lens E7 and the eighth lens E8 are aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0034] Wherein, x is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the vertex of the aspherical surface, k is the cone coefficient, and Ai is the coefficient corresponding to the i-th high-order term in the aspherical surface shape formula. Table 2 shows the cone coefficients and high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 of each aspherical surface that can be used in the first embodiment.

[0035] Table 2

[0036] Embodiment 2 The following reference Figure 3 to Figure 4 An optical imaging lens according to Embodiment 2 of the present application is described. Figure 3 A schematic structural diagram of an optical imaging lens according to Embodiment 2 of the present application is shown.

[0037] like Figure 3As shown, the optical imaging lens according to an exemplary embodiment of the present application includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, an aperture STO, a sixth lens E6, a seventh lens E7, a seventh lens E8, a filter E9 and an imaging surface S19.

[0038] The first lens E1 has negative focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is concave, and its image side surface S4 is concave. The third lens E3 has negative focal power, and its object side surface S5 is concave, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has positive focal power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has positive focal power, and its object side surface S12 is convex, and its image side surface S13 is convex. The seventh lens E7 has negative focal power, and its object side surface S13 is concave, and its image side surface S14 is concave. The eighth lens E8 has positive focal power, and its object side surface S15 is convex, and its image side surface S16 is concave. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0039] Table 3 shows the surface type, curvature radius, thickness and material of each lens of the optical imaging lens of Example 2, wherein the units of the curvature radius and thickness are both millimeters (mm).

[0040] Table 3

[0041] In Table 3, the object side surface and the image side surface of any one of the second lens E2, the third lens E3, the fifth lens E5, the sixth lens E6, the seventh lens E7 and the eighth lens E8 are aspherical surfaces, and the surface shape of the aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0042] Wherein, x is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the vertex of the aspherical surface, k is the cone coefficient, and Ai is the coefficient corresponding to the i-th high-order term in the aspherical surface shape formula. Table 4 shows the cone coefficients and high-order term coefficients A4, A6, A8, A10, A12, A14 and A16 of each aspherical surface that can be used in the second embodiment.

[0043] Table 4

[0044] Embodiment 3 The following reference Figures 5 and 6 An optical imaging lens according to Embodiment 3 of the present application is described. Figure 5 A schematic structural diagram of an optical imaging lens according to Embodiment 3 of the present application is shown.

[0045] 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.

[0046] The first lens E1 has negative focal power, and its object side surface S1 is convex, and its image side surface S2 is concave. The second lens E2 has negative focal power, and its object side surface S3 is concave, and its image side surface S4 is concave. The third lens E3 has negative focal power, and its object side surface S5 is concave, and its image side surface S6 is concave. The fourth lens E4 has positive focal power, and its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has positive focal power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has positive focal power, and its object side surface S12 is convex, and its image side surface S13 is convex. The seventh lens E7 has negative focal power, and its object side surface S13 is concave, and its image side surface S14 is concave. The eighth lens E8 has positive focal power, and its object side surface S15 is convex, and its image side surface S16 is concave. The filter E9 has an object-side surface S17 and an image-side surface S18. Light from the object passes through the surfaces S1 to S18 in sequence and is finally imaged on the imaging surface S19.

[0047] Table 5 shows the surface type, curvature radius, thickness and material of each lens of the optical imaging lens of Example 3, wherein the units of the curvature radius and thickness are both millimeters (mm).

[0048] Table 5

[0049] In Table 5, the object side surface and the image side surface of any one of the second lens E2, the third lens E3, the fifth lens E5, the sixth lens E6, the seventh lens E7 and the eighth lens E8 are aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0050] Wherein, x is the distance from the corresponding point on the aspherical surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the vertex of the aspherical surface, k is the cone coefficient, and Ai is the coefficient corresponding to the i-th high-order term in the aspherical surface shape formula. Table 6 shows the cone coefficients and high-order term coefficients A4, A6, A8, A10, A12, A14 and A16 of each aspherical surface that can be used in the first embodiment.

[0051] Table 6

[0052] In Examples 1-3, each conditional expression satisfies the conditions in the following table: Table 7

[0053] A camera module comprises at least an optical lens, in which the wide-angle optical system is installed. The camera module has the advantages of being light, high in pixels, wide in angle, small in aperture and low in cost, 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 a larger field of view and high resolution for the optical system, and can be used in multiple fields.

[0054] As described above, one or more implementation methods are provided in combination with specific contents, and the specific implementation of the present invention is not limited to these descriptions. Any similarity or similarity with the method, structure, etc. of the present invention, or any technical deduction or replacement based on the concept of the present invention, shall be regarded as the protection scope of the present invention.

Claims

1. A wide-angle optical system, which is composed of a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens in sequence from the object plane to the image plane along the optical axis, characterized in that: The first lens has negative optical power, its object side surface is convex, and its image side surface is concave; The second lens has negative optical power, 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; Among them, 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, characterized in that: The optical system satisfies the following relationship: |f2 / f| < 8.0; | f3 / f |< 7.0; | f4 / f |< 5.0; Among them, 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 claim 1, characterized in that: 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 axial distance from the object side of the first lens to the imaging surface.

4. The wide-angle optical system according to claim 1, characterized in that: The optical system satisfies the following relationship: 15.0< TTL / EPD < 23.0; Wherein, 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 system.

5. The wide-angle optical system according to claim 1, characterized in that: The optical system satisfies the following relationship: |R11 / R12| < 4.5; | R31 / R32 | < 3.3; | R41 / R42 | < 2.5; | 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 claim 1, characterized in that: The optical system satisfies the following relationship: 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; 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 claim 1, characterized in that: The optical system satisfies the following relationship: CT3 / ET3 < 2.0; CT4 / ET4 < 4.0; 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 claim 1, characterized in that: The optical system satisfies the following relationship: -3.0<f*tan(FOV) / (DT1 / 2)<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, and DT1 is the effective semi-aperture of the object side of the first lens.

9. The wide-angle optical system according to claim 1, characterized in that: The optical system satisfies the following relationship: -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, and DT3 is the effective half aperture of the object side of the third lens.

10. 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 9 is installed in the optical lens.

Images