An ultra-large aperture, wide-angle, high-pixel optical system and a camera module using the same

Abstract

The application provides a large-aperture wide-angle high-pixel optical system and an application camera module thereof, which mainly comprises nine lenses, wherein the first lens has negative optical power, the object side is a convex surface, and the image side is a concave surface; the second lens has negative optical power, the object side is a concave surface; the third lens has positive optical power, the object side is a convex surface, and the image side is a convex surface; the fourth lens has positive optical power, the object side is a convex surface; the fifth lens has positive optical power, the object side is a convex surface, and the image side is a convex surface; the sixth lens has positive optical power, the image side is a convex surface; the seventh lens has negative optical power, the image side is a concave surface; the eighth lens has positive optical power, the object side is a convex surface, and the image side is a convex surface; and the ninth lens has optical power; through reasonable matching of the shapes and optical powers of the lenses, the large-aperture wide-angle high-pixel advantage is achieved, and meanwhile, the configuration of the large aperture can increase the light quantity of the optical system and the imaging quality.

Description

Technical Field

[0001] The present application relates to the field of optical imaging, and in particular to an ultra-large aperture, wide-angle, high-pixel optical system used for security monitoring in the consumer field and a camera module used therein. Background Art

[0002] With the rapid development of camera lenses in the security and surveillance field, people are demanding higher and higher image quality in extremely low-light environments. They require not only bright images but also high clarity. However, the lenses currently available on the market suffer from dark images, high noise levels, and low visibility in extremely low-light environments, failing to meet these demands. To achieve high-definition image clarity in extremely low-light environments, lenses with larger apertures are required. Furthermore, to achieve high pixel counts, the optical system's field of view must be increased, which will significantly increase market competitiveness. Summary of the Invention

[0003] This application aims to solve the technical problems of existing lenses such as dark shooting images, large noise and low recognition, and to provide an optical system with the advantages of ultra-large aperture, wide angle and high pixel. At the same time, the large aperture configuration can increase the amount of light entering the optical system and higher imaging quality.

[0004] An ultra-large aperture, wide-angle, high-pixel 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, an eighth lens, and a ninth 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 object side surface is concave;

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

[0008] The fourth lens has positive refractive power and its object 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, and its image side surface is convex;

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

[0012] The eighth lens has positive refractive power, its object-side surface is convex, and its image-side surface is convex;

[0013] The ninth lens has optical power.

[0014] Preferably, the optical system satisfies the following relationship: 0.54 < f / TTL*ImagH < 0.71;

[0015] wherein f is the effective focal length of the optical system, TTL is the on-axis distance from the first lens object side to the image plane, and ImagH is half of the diagonal length of the effective pixel area on the image plane.

[0016] Preferably, each lens of the optical system satisfies the following conditions:

[0017] -10.0 mm < f1 < -5.2 mm;

[0018] -15.0 mm < f2 < -6.2 mm;

[0019] 6.3 mm < f3 < 12.8 mm;

[0020] 10.4 mm < f4 < 40.0 mm;

[0021] 8.5 mm < f5 < 50.0 mm;

[0022] 20.1 mm < f6 < 53.6 mm;

[0023] -6.9 mm < f7 < -1.5 mm;

[0024] 4.2 mm < f8 < 7.5 mm;

[0025] 0.5 mm < f78 / f9 < 4.3 mm;

[0026] wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens,

[0027] f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, f7 is

[0028] the focal length of the seventh lens, f8 is the focal length of the eighth lens, and f9 is the focal length of the ninth lens.

[0029] Preferably, each lens of the optical system satisfies the following conditions:

[0030] -2.5 < f1 / f < 0;

[0031] -5.0 < f2 / f < -1.5;

[0032] 2.0 < f3 / f < 5.0;

[0033] 2.0 < f4 / f < 9.0;

[0034] 2.5 < f5 / f < 12.3;

[0035] 2.0 <f6 / f<13.0;

[0036] -2.0 <f7 / f<1.0;

[0037] 0.0 <f8 / f<3.0;

[0038] -40.0 <f9 / f<40.0;

[0039] Wherein, f is the focal length of the entire optical system, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, f7 is the focal length of the seventh lens, f8 is the focal length of the eighth lens, and f9 is the focal length of the ninth lens.

[0040] Preferably, the material refractive index Nd1 and the material Abbe constant Vd1 of the first lens satisfy: 1.60 <Nd1<1.95,30<Vd1<60。

[0041] Preferably, the refractive index Nd2 and the Abbe number Vd2 of the material of the second lens satisfy: 1.52 <Nd2<1.75,15<Vd2<35。

[0042] Preferably, the refractive index Nd3 and the Abbe number Vd3 of the material of the third lens satisfy: 1.75 <Nd3<1.95,17.5<Vd3<40。

[0043] Preferably, the material refractive index Nd4 and the material Abbe number Vd4 of the fourth lens satisfy: 1.52 <Nd4<1.75,15<Vd4<35。

[0044] Preferably, the refractive index Nd5 and the Abbe number Vd5 of the material of the fifth lens satisfy: 1.35 <Nd5<1.65,70<Vd5<85。

[0045] Preferably, the refractive index Nd6 and the Abbe number Vd6 of the sixth lens material satisfy: 1.42 <Nd6<1.65,45<Vd6<70。

[0046] Preferably, the refractive index Nd7 and the Abbe number Vd7 of the material of the seventh lens satisfy: 1.65 <Nd7<1.95,17.5<Vd7<35。

[0047] Preferably, the refractive index Nd8 and the Abbe number Vd8 of the material of the eighth lens satisfy: 1.45 <Nd8<1.7,55<Vd8<76。

[0048] Preferably, the refractive index Nd9 and the Abbe number Vd9 of the ninth lens satisfy: 1.43 <Nd9<1.66,41<Vd9<62。

[0049] Preferably, the optical system satisfies the following relationship: D1 / (Fno*Ymax)<3.5, wherein D1 is the maximum effective diameter of the first lens, Fno is the system aperture, and Ymax is the maximum image circle radius of the system.

[0050] Preferably, the first lens, the third lens, the fifth lens, the seventh lens and the eighth lens are spherical lenses, and the second lens, the fourth lens, the sixth lens and the ninth lens are plastic aspherical lenses.

[0051] 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 ultra-large aperture wide-angle high-pixel optical system is installed.

[0052] Compared with the prior art, the present invention has the following advantages:

[0053] The present invention provides an ultra-large aperture, wide-angle, and high-pixel optical system and a camera module applied thereto, which is mainly composed of 9 lenses, wherein 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 concave; the third lens has positive optical power, its object-side surface is convex, and its image-side surface is convex; the fourth lens has positive optical power, its object-side surface is convex; the fifth lens has positive optical power, its object-side surface is convex, and its image-side surface is convex; the sixth lens has positive optical power, its image-side surface is convex; the seventh lens has negative optical power, its image-side surface is concave; the eighth lens has positive optical power, its object-side surface is convex, and its image-side surface is convex; and the ninth lens has optical power. Through the reasonable combination of lens shape and optical power, the system has the advantages of ultra-large aperture, wide angle, and high pixel. At the same time, the configuration of the large aperture can increase the amount of light entering the optical system and achieve higher imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] 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.

[0055] Figure 1 Schematic diagram of the structure of the optical system or camera module of Example 1 of the present application;

[0056] Figure 2 is the astigmatism and distortion curve of the optical system or camera module of Example 1 of the present application;

[0057] Figure 3 is the MTF curve of the optical system or camera module of Example 1 of the present application;

[0058] Figure 4 2 is a schematic structural diagram of an optical system or camera module according to embodiment 2 of the present application;

[0059] Figure 5 is the astigmatism and distortion curve of the optical system or camera module of Example 2 of the present application;

[0060] Figure 6 is the MTF curve of the optical system or camera module of Example 2 of the present application;

[0061] Figure 7 2 is a schematic structural diagram of the optical system or camera module according to Embodiment 3 of the present application;

[0062] Figure 8 is the astigmatism and distortion curve of the optical system or camera module of Example 3 of the present application;

[0063] Figure 9 is the MTF curve of the optical system or camera module of Example 3 of the present application;

[0064] Figure 10 Schematic diagram of the structure of the optical system or camera module according to Example 4 of the present application;

[0065] Figure 11 is the astigmatism and distortion curve of the optical system or camera module of Example 4 of the present application;

[0066] Figure 12 is the MTF curve of the optical system or camera module of Example 4 of the present application;

[0067] Figure 13 Schematic diagram of the structure of the optical system or camera module of Example 5 of the present application;

[0068] Figure 14 is the astigmatism and distortion curve of the optical system or camera module of Example 5 of the present application;

[0069] Figure 15 This is the MTF curve of the optical system or camera module of Example 5 of the present application. DETAILED DESCRIPTION

[0070] like Figure 1-15 As shown, the present application provides an ultra-large aperture, wide-angle, high-pixel optical system, which includes, along the optical axis from the object plane to the image plane, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, and a ninth lens E9;

[0071] The first lens has negative optical power, its object side surface is convex, and its image side surface is concave;

[0072] The second lens has negative optical power and its object side surface is concave;

[0073] The third lens has positive refractive power, its object-side surface is convex, and its image-side surface is convex;

[0074] The fourth lens has positive refractive power and its object side surface is convex;

[0075] The fifth lens has positive refractive power, its object-side surface is convex, and its image-side surface is convex;

[0076] The sixth lens has positive refractive power, and its image side surface is convex;

[0077] The seventh lens has negative optical power, and its image side surface is concave;

[0078] The eighth lens has positive refractive power, its object-side surface is convex, and its image-side surface is convex;

[0079] The ninth lens has optical power.

[0080] The optical system of the embodiment of the present application is mainly composed of 9 lenses. Through the reasonable combination of lens shape and optical focal length, it has the advantages of ultra-large aperture, wide angle, and high pixel. At the same time, the configuration of large aperture can increase the amount of light entering the optical system and higher imaging quality.

[0081] Furthermore, the optical system satisfies the following relationship: 0.54 <f / TTL*ImagH<0.71;其中,f为光学系统的有效焦距,TTL为第一透镜E1物侧面至成像面的轴上距离, ImagH为成像面上有效像素区域对角线长的一半。该关系式反映了光学镜头在视场角和轻薄特性上的约束情况,当满足上述关系式时,能够在满足光学镜头呈广角的基础上,满足市场对光学镜头对小头部和轻薄性的需求。当超过关系式上限,在保障光学镜头的视场角为广角的基础上,f / TTL*ImagH进一步缩小,会过度压缩光学镜头的轻薄性,不利于光学镜头的性能的提升。当低于关系式下限时,光学镜头的轻薄性不足,不利于光学镜头的小型化设计。

[0082] Furthermore, each lens of the optical system meets the following conditions: -10.0mm <f1<-5.2mm; -15.0mm<f2<-6.2mm; 6.3mm<f3<12.8mm;10.4mm<f4<40.0mm; 8.5mm<f5<50.0mm; 20.1mm<f6<53.6mm;-6.9mm<f7<-1.5mm;4.2mm<f8<7.5mm; 0.5mm<f78 / f9<4.3mm;其中,f1为第一透镜E1的焦距,f2为第二透镜E2的焦距,f3为第三透镜E3的焦距,f4为第四透镜E4的焦距,f5为第五透镜E5的焦距,f6为第六透镜E6的焦距,f7为第七透镜E7的焦距,f8为第八透镜E8的焦距, f9为第九透镜E9的焦距。通过对光学系统各枚透镜有效焦距的合理控制,可以使光学系统满足大视场角的同时,限制部品有效径,控制整体光学系统尺寸,并调节光线入射角度,有利于矫正系统像差。

[0083] Furthermore, each lens of the optical system satisfies the following conditions: -2.5 <f1 / f<0; -5.0<f2 / f<-1.5;2.0<f3 / f<5.0; 2.0<f4 / f<9.0; 2.5<f5 / f<12.3; 2.0<f6 / f<13.0; -2.0<f7 / f<1.0; 0.0<f8 / f<3.0; -40.0<f9 / f<40.0;其中,f为整个光学系统的焦距,f1为第一透镜E1的焦距,f2为第二透镜E2的焦距,f3为第三透镜E3的焦距,f4为第四透镜E4的焦距,f5为第五透镜E5的焦距,f6为第六透镜E6的焦距,f7为第七透镜E7的焦距,f8为第八透镜E8的焦距, f9为第九透镜E9的焦距。通过约束各透镜和光学系统焦距的比值在合理的范围,既保证了光学系统优良的像质,也保证了系统良好的加工性。

[0084] Furthermore, the material refractive index Nd1 and the material Abbe constant Vd1 of the first lens E1 satisfy: 1.60 <Nd1<1.95,30<Vd1<60。第二透镜E2的材料折射率Nd2、材料阿贝数Vd2满足:1.52<Nd2<1.75,15<Vd2<35。第三透镜E3的材料折射率Nd3、材料阿贝数Vd3满足:1.75<Nd3<1.95,17.5<Vd3<40。第四透镜E4的材料折射率Nd4、材料阿贝数Vd4满足:1.52<Nd4<1.75,15<Vd4<35。第五透镜E5的材料折射率Nd5、材料阿贝数Vd5满足:1.35<Nd5<1.65,70<Vd5<85。第六透镜E6的材料折射率Nd6、材料阿贝数Vd6满足:1.42<Nd6<1.65,45<Vd6<70。第七透镜E7的材料折射率Nd7、材料阿贝数Vd7满足:1.65<Nd7<1.95,17.5<Vd7<35。第八透镜E8的材料折射率Nd8、材料阿贝数Vd8满足:1.45<Nd8<1.7,55<Vd8<76。第九透镜E9的材料折射率Nd9、材料阿贝数Vd9满足:1.43<Nd9<1.66,41<Vd9<62。通过限定各透镜的折射率与阿贝数之间的关系,有益于减小像差,提升了高像素光学系统的像质。

[0085] Furthermore, the optical system satisfies the following relationship: D1 / (Fno*Ymax)<3.5. Here, D1 is the maximum effective diameter of the first lens element, Fno is the system aperture, and Ymax is the system's maximum image radius. This rational design of the optical system with a wide field of view effectively meets the practical requirements of an ultra-wide-angle optical system.

[0086] Furthermore, the first lens E1, the third lens E3, the fifth lens E5, the seventh lens E7 and the eighth lens E8 are spherical lenses, and the second lens E2, the fourth lens E4, the sixth lens E6 and the ninth lens E9 are plastic aspherical lenses. By rationally distributing lens surface shapes, lens aberrations are optimized, and analytical performance is improved, the lens has the advantages of ultra-large aperture, wide angle and high pixel count.

[0087] Example 1

[0088] The following reference Figures 1 to 3 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.

[0089] like Figure 1As shown, the optical imaging lens according to the exemplary embodiment of the present application comprises, in sequence 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, a sixth lens E6, a seventh lens E7, an eighth lens E8, a ninth lens E9, a filter E10, and an imaging surface S21.

[0090] The first lens E1 has a negative focal power, the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface. The second lens E2 has a negative focal power, the object side surface S3 is a concave surface, and the image side surface S4 is a concave surface. The third lens E3 has a positive focal power, the object side surface S5 is a convex surface, and the image side surface S6 is a convex surface. The fourth lens E4 has a positive focal power, the object side surface S8 is a convex surface, and the image side surface S9 is a convex surface. The fifth lens E5 has a positive focal power, the object side surface S10 is a convex surface, and the image side surface S11 is a convex surface. The sixth lens E6 has a positive focal power, the object side surface S12 is a concave surface, and the image side surface S13 is a convex surface. The seventh lens E7 has a negative focal power, the object side surface S14 is a concave surface, and the image side surface S15 is a concave surface. The eighth lens E8 has a positive focal power, the object side surface S15 is a convex surface, and the image side surface S16 is a convex surface. The ninth lens E9 has a positive focal power, the object side surface S17 is a convex surface, and the image side surface S18 is a concave surface. The filter E10 has an object side surface S19 and an image side surface S20. Light from an object passes through the surfaces S1 to S20 in sequence and is finally imaged on the imaging surface S21.

[0091] Table 1 shows the surface type, the radius of curvature, the thickness, and the material of each lens of the optical imaging lens of Example 1, wherein the units of the radius of curvature and the thickness are millimeters (mm).

[0092] Table 1

[0093]

[0094] In Table 2, the object side surface and the image side surface of any one of the second lens E2, the fourth lens E4, the sixth lens E6 to the ninth lens E9 are aspherical surfaces, and the surface type of each aspherical lens can be defined by, but not limited to, the following aspherical surface formula:

[0095]

[0096] wherein x is the distance from a corresponding point on the aspherical surface to a plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the vertex of the aspherical surface, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th high order term in the aspherical surface formula. Table 2 shows the conic coefficient and the high order term coefficients A4, A6, A8, A10, A12, A14, and A16 of each aspherical surface that can be used in the first embodiment.

[0097] Table 2

[0098]

[0099] Figure 2 The astigmatism and distortion curves of the optical imaging lens of Example 1 are shown. Astigmatism represents meridional image curvature and sagittal image curvature; distortion represents the distortion magnitude corresponding to different image heights.

[0100] Figure 3 The MTF curve of the optical imaging lens of Example 1 is shown, which represents the MTF values ​​in the meridional and sagittal directions of different fields of view.

[0101] The optical imaging lens provided in Example 1 can achieve good imaging quality.

[0102] Example 2

[0103] The following reference Figures 4 to 6 The optical imaging lens according to Example 2 of the present application is described. Figure 4 A schematic structural diagram of an optical imaging lens according to Example 2 of the present application is shown.

[0104] like Figure 4 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, a sixth lens E6, a seventh lens E7, an eighth lens E8, a ninth lens E9, a filter E10, and an imaging surface S21.

[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 concave and its image-side surface S4 being convex. 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 positive optical power, with its object-side surface S8 being convex and its image-side surface S9 being convex. The fifth lens E5 has positive optical power, with its object-side surface S10 being convex and its image-side surface S11 being convex. The sixth lens E6 has positive optical power, with its object-side surface S12 being concave and its image-side surface S13 being convex. The seventh lens E7 has negative optical power, with its object-side surface S14 being concave and its image-side surface S15 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 convex. The ninth lens element E9 has negative power, with a concave object-side surface S17 and a concave image-side surface S18. The filter E10 has an object-side surface S19 and an image-side surface S20. Light from an object passes through surfaces S1 through S20 in sequence and is ultimately imaged on imaging surface S21.

[0106] 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).

[0107] Table 3

[0108]

[0109] In Table 4, any one of the object side and image side of the second lens E2, the fourth lens E4, and the sixth lens E6 to the ninth lens E9 is an aspherical surface. The surface shape of each aspherical lens can be defined by, but 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 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.

[0112] Table 4

[0113]

[0114] Figure 5 The astigmatism and distortion curves of the optical imaging lens of Example 2 are shown. Astigmatism represents meridional image curvature and sagittal image curvature; distortion represents the distortion magnitude corresponding to different image heights.

[0115] Figure 6 The MTF curve of the optical imaging lens of Example 2 is shown, which represents the MTF values ​​in the meridional and sagittal directions of different fields of view.

[0116] The optical imaging lens provided in Example 2 can achieve good imaging quality.

[0117] Example 3:

[0118] The following reference Figures 7 to 9 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 3 of the present application is shown.

[0119] like Figure 7As 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, a sixth lens E6, a seventh lens E7, an eighth lens E8, a ninth lens E9, a filter E10, and an imaging surface S21.

[0120] 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 convex. The third lens E3 has positive optical power, with its object-side surface S6 being convex and its image-side surface S7 being convex. The fourth lens E4 has positive optical power, with its object-side surface S8 being convex and its image-side surface S9 being convex. The fifth lens E5 has positive optical power, with its object-side surface S10 being convex and its image-side surface S11 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 S14 being concave and its image-side surface S15 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 convex. The ninth lens element E9 has positive refractive power, with a convex object-side surface S17 and a concave image-side surface S18. The filter E10 has an object-side surface S19 and an image-side surface S20. Light from an object passes through surfaces S1 through S20 in sequence and is ultimately imaged on imaging surface S21.

[0121] 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).

[0122] Table 5

[0123]

[0124] In Table 6, any one of the object side and image side of the second lens E2, the fourth lens E4, and the sixth lens E6 to the ninth lens E9 is aspherical. The surface shape of each aspherical lens can be defined by, but not limited to, the following aspherical surface formula:

[0125]

[0126] Where x is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex, 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 third embodiment.

[0127] Table 6

[0128]

[0129] Figure 8 The astigmatism and distortion curves of the optical imaging lens of Example 3 are shown. Astigmatism represents meridional image curvature and sagittal image curvature; distortion represents the distortion magnitude corresponding to different image heights.

[0130] Figure 9 The MTF curve of the optical imaging lens of Example 3 is shown, which represents the MTF values ​​in the meridional and sagittal directions of different fields of view.

[0131] The optical imaging lens provided in Example 3 can achieve good imaging quality.

[0132] Example 4:

[0133] The following reference Figures 10 to 12 An optical imaging lens according to Example 4 of the present application is described. Figure 10 A schematic structural diagram of an optical imaging lens according to Example 4 of the present application is shown.

[0134] like Figure 10 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, a sixth lens E6, a seventh lens E7, an eighth lens E8, a ninth lens E9, a filter E10, and an imaging surface S21.

[0135] 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 convex. 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 positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The fifth lens E5 has positive optical power, with its object-side surface S10 being convex and its image-side surface S11 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 S14 being concave and its image-side surface S15 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 convex. The ninth lens element E9 has positive refractive power, with a convex object-side surface S17 and a concave image-side surface S18. The filter E10 has an object-side surface S19 and an image-side surface S20. Light from an object passes through surfaces S1 through S20 in sequence and is ultimately imaged on imaging surface S21.

[0136] Table 7 shows the surface type, radius of curvature, thickness and material of each lens of the optical imaging lens of Example 4, wherein the units of the radius of curvature and the thickness are millimeter (mm).

[0137] Table 7

[0138]

[0139] In Table 8, the object side surface and the image side surface of each of the second lens E2, the fourth lens E4, the sixth lens E6 to the ninth lens E9 are aspherical surfaces, and the surface shape of each aspherical surface can be defined by, but is not limited to, the following aspherical surface formula:

[0140]

[0141] wherein x is the distance from the corresponding point on the aspherical surface to the tangent plane at 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 at the vertex of the aspherical surface, k is the conic coefficient, and Ai is the coefficient corresponding to the ith high order term in the aspherical surface formula. Table 8 shows the conic coefficient and the high order term coefficients A4, A6, A8, A10, A12, A14 and A16 of each aspherical surface that can be used in the fourth embodiment.

[0142] Table 8

[0143]

[0144] Figure 11 The astigmatism and distortion curves of the optical imaging lens of Example 4 are shown. The astigmatism represents the meridional image surface curvature and the sagittal image surface curvature; the distortion represents the distortion size value corresponding to different image heights.

[0145] Figure 12 The MTF curves of the optical imaging lens of Example 4 are shown, which represent the meridional and sagittal MTF values at different fields of view.

[0146] The optical imaging lens given in Example 4 can achieve good imaging quality.

[0147] Example Five,

[0148] The following refers to Figures 13 to 15 An optical imaging lens according to Example 5 of the present application is described. Figure 13 A structure schematic diagram of the optical imaging lens according to Example 5 of the present application is shown.

[0149] As Figure 13As shown, the optical imaging lens according to the exemplary embodiments of the present application comprises, in sequence 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, a sixth lens E6, a seventh lens E7, an eighth lens E8, a ninth lens E9, a filter E10, and an imaging surface S21.

[0150] The first lens E1 has a negative focal power, the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface. The second lens E2 has a negative focal power, the object side surface S3 is a concave surface, and the image side surface S4 is a convex surface. The third lens E3 has a positive focal power, the object side surface S5 is a convex surface, and the image side surface S6 is a convex surface. The fourth lens E4 has a positive focal power, the object side surface S8 is a convex surface, and the image side surface S9 is a convex surface. The fifth lens E5 has a positive focal power, the object side surface S10 is a convex surface, and the image side surface S11 is a convex surface. The sixth lens E6 has a positive focal power, the object side surface S12 is a convex surface, and the image side surface S13 is a convex surface. The seventh lens E7 has a negative focal power, the object side surface S14 is a concave surface, and the image side surface S15 is a concave surface. The eighth lens E8 has a positive focal power, the object side surface S15 is a convex surface, and the image side surface S16 is a convex surface. The ninth lens E9 has a positive focal power, the object side surface S17 is a convex surface, and the image side surface S18 is a concave surface. The filter E10 has an object side surface S19 and an image side surface S20. Light from an object passes through the surfaces S1 to S20 in sequence and is finally imaged on the imaging surface S21.

[0151] Table 9 shows the surface type, the radius of curvature, the thickness, and the material of each lens of the optical imaging lens of Example 5, wherein the units of the radius of curvature and the thickness are millimeters (mm).

[0152] Table 9

[0153]

[0154] In Table 10, the object side surface and the image side surface of any one of the second lens E2, the fourth lens E4, the sixth lens E6 to the ninth lens E9 are aspherical surfaces, and the surface type of each aspherical lens can be defined by, but not limited to, the following aspherical surface formula:

[0155]

[0156] wherein x is the distance from a corresponding point on the aspherical surface to a plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspherical surface to the optical axis, c is the curvature of the vertex of the aspherical surface, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th high order term in the aspherical surface formula. Table 10 shows the conic coefficient and the high order term coefficients A4, A6, A8, A10, A12, A14, and A16 of each aspherical surface that can be used in the fifth embodiment.

[0157] Table 10

[0158]

[0159] Figure 14 The astigmatism and distortion curves of the optical imaging lens of Example 5 are shown. Astigmatism represents meridional image curvature and sagittal image curvature; distortion represents the distortion magnitude corresponding to different image heights.

[0160] Figure 15 The MTF curve of the optical imaging lens of Example 5 is shown, which represents the MTF values ​​in the meridional and sagittal directions at different fields of view.

[0161] The optical imaging lens provided in Example 5 can achieve good imaging quality.

[0162] A camera module includes at least an optical lens, in which the above-mentioned vehicle-mounted optical system is installed. The camera module has the advantages of ultra-large aperture, wide angle, and high pixel. At the same time, the large aperture configuration can increase the amount of light entering the optical system and improve the imaging quality, and has better application prospects in the field of security monitoring.

[0163] The above descriptions are provided in conjunction with specific content to provide one or more embodiments, and the specific implementation of the present invention is not limited 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 considered within the scope of protection of the present invention.

Claims

1. An ultra-large aperture, wide-angle, high-pixel 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, an eighth lens, and a ninth lens, characterized by: 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 object side surface is concave; The third lens has positive refractive power, its object-side surface is convex, and its image-side surface is convex; The fourth lens has positive refractive power and its object 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, 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 eighth lens has positive refractive power, its object-side surface is convex, and its image-side surface is convex; The ninth lens has optical power, and its image side surface is concave; The optical system satisfies the following relationship: 0.54mm < f / TTL*ImagH < 0.71mm; Where f is the effective focal length of the optical system, TTL is the on-axis distance from the object side of the first lens to the imaging surface, and ImagH is half the diagonal length of the effective pixel area on the imaging surface; Each lens of the optical system meets the following conditions: -10.0mm <f1<-5.2mm; -15.0mm <f2<-6.2mm; 6.3mm <f3<12.8mm; 10.4mm <f4<40.0mm; 8.5mm <f5<50.0mm; 20.1mm <f6<53.6mm; -6.9mm <f7<-1.5mm; 4.2mm <f8<7.5mm; 0.5< f78 / f9<4.3; Among them, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, f7 is the focal length of the seventh lens, f8 is the focal length of the eighth lens, and f9 is the focal length of the ninth lens.

2. The ultra-large aperture, wide-angle, high-pixel optical system according to claim 1, characterized in that: Each lens of the optical system meets the following conditions: -2.5 <f1 / f<0; -5.0 <f2 / f<-1.5; 2.0 <f3 / f<5.0; 2.0 <f4 / f<9.0; 2.5 <f5 / f<12.3; 2.0 <f6 / f<13.0; -2.0 <f7 / f<1.0; 0.0 <f8 / f<3.0; -40.0 <f9 / f<40.0; Wherein, f is the focal length of the entire optical system, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, f6 is the focal length of the sixth lens, f7 is the focal length of the seventh lens, f8 is the focal length of the eighth lens, and f9 is the focal length of the ninth lens.

3. The ultra-large aperture, wide-angle, high-pixel optical system according to any one of claims 1-2, characterized in that: The material refractive index Nd1 and the material Abbe constant Vd1 of the first lens meet the following requirements: 1.60 <Nd1<1.95,30<Vd1<60; The material refractive index Nd2 and the material Abbe number Vd2 of the second lens meet the following requirements: 1.52 <Nd2<1.75,15<Vd2<35。 4. The ultra-large aperture, wide-angle, high-pixel optical system according to any one of claims 1-2, characterized in that: The material refractive index Nd3 and the material Abbe number Vd3 of the third lens meet the following requirements: 1.75 <Nd3<1.95,17.5<Vd3<40; The material refractive index Nd4 and the material Abbe number Vd4 of the fourth lens meet the following requirements: 1.52 <Nd4<1.75,15<Vd4<35。 5. The ultra-large aperture, wide-angle, high-pixel optical system according to any one of claims 1-2, characterized in that: The material refractive index Nd5 and the material Abbe number Vd5 of the fifth lens meet the following requirements: 1.35 <Nd5<1.65,70<Vd5<85; The refractive index Nd6 and Abbe number Vd6 of the sixth lens satisfy: 1.42 <Nd6<1.65,45<Vd6<70。 6. The ultra-large aperture, wide-angle, high-pixel optical system according to any one of claims 1-2, characterized in that: The material refractive index Nd7 and the material Abbe number Vd7 of the seventh lens meet the following requirements: 1.65 <Nd7<1.95,17.5<Vd7<35; The refractive index Nd8 and Abbe number Vd8 of the eighth lens satisfy: 1.45 <Nd8<1.7,55<Vd8<76; The material refractive index Nd9 and the material Abbe number Vd9 of the ninth lens meet the following requirements: 1.43 <Nd9<1.66,41<Vd9<62。 7. The ultra-large aperture, wide-angle, high-pixel optical system according to any one of claims 1-2, characterized in that: The optical system satisfies the following relationship: D1 / (Fno*Ymax)<3.5; Wherein, D1 is the maximum effective diameter of the first lens, Fno is the system aperture, and Ymax is the maximum image circle radius of the system.

8. The ultra-large aperture, wide-angle, high-pixel optical system according to any one of claims 1-2, characterized in that: The first lens, the third lens, the fifth lens, the seventh lens and the eighth lens are spherical lenses, and the second lens, the fourth lens, the sixth lens and the ninth lens are plastic aspherical lenses.

9. A camera module, comprising at least an optical lens, characterized in that: The optical lens is equipped with the ultra-large aperture, wide-angle, high-pixel optical system according to any one of claims 1 to 8.

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