Confocal wide-angle optical imaging system and camera module applied by confocal wide-angle optical imaging system

Abstract

The utility model provides a confocal wide-angle optical imaging system and a camera module applying the same, and the system mainly comprises 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 object side surface of the second lens is a convex surface, the image side surface of the second lens is a concave surface, and the third lens has negative focal power, the object side surface of the third lens is a concave surface. The image side surface of the fourth lens is a concave surface, the fourth lens has positive focal power, the object side surface of the fourth lens is a convex surface, the fifth lens has positive focal power, the object side surface of the fifth lens is a convex surface, the image side surface of the fifth lens is a convex surface, the sixth lens has focal power, the seventh lens has focal power, and the eighth lens has positive focal power and the image side surface of the eighth lens is a convex surface. The wide-angle optical imaging system effectively meets the design requirements of large field angle and high resolution of the optical imaging system, has the advantages of high pixel, confocal property, large wide angle and low cost, and is compact in structure and convenient to process and install.

Description

Technical Field

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

[0002] In recent years, with the advancement of technology and the development of mobile internet, people are pursuing diversified imaging effects. Optical lenses that deliver high-quality images across a wide field of view have attracted much attention. Optical imaging lenses have rapidly developed and are now widely used in various fields, including smartphones, smart homes, tablets, video conferencing, in-vehicle monitoring, security surveillance, and intelligent transportation systems.

[0003] However, currently available imaging lenses are unable to meet the high image quality requirements of wide-angle lenses in both the visible and infrared bands, and are also costly. Therefore, it is crucial to design and manufacture low-cost, clear confocal wide-angle lenses that can maintain excellent and stable performance in harsh environments. Utility Model Content

[0004] The present application aims to provide a confocal optical imaging system with high image quality, wide angle, low cost and good and stable performance at high and low temperatures, which can be used in multiple fields.

[0005] A confocal wide-angle optical imaging 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;

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

[0007] The second lens has negative optical power, its object side surface is convex, and its image side surface is concave;

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

[0009] The fourth lens has positive refractive power and its object side surface is convex;

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

[0011] The sixth lens has optical power;

[0012] The seventh lens has optical power;

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

[0014] Furthermore, the optical imaging system satisfies the following conditions: -5.0 <f234 / f678<3.0;其中, f234为第二透镜、第三透镜和第四透镜的有效组合焦距, f678为第六透镜、第七透镜和第八透镜的有效组合焦距。

[0015] Furthermore, the optical imaging system satisfies the following condition: |(f6-f7) / (f6+f7)|<14; wherein f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens.

[0016] Furthermore, the optical imaging system satisfies the following conditions: | f1 / f |<9.5; | f4 / f |<5.5; wherein f is the effective focal length of the optical imaging system, f1 is the effective focal length of the first lens, and f4 is the effective focal length of the fourth lens.

[0017] Furthermore, the optical imaging system satisfies the following conditions: 15<(vd1+vd4) / (nd1+nd4)<25; 150 <vd2+vd3+vd5+vd8<230;35<vd6+vd7<115;其中,nd1为第一透镜的折射率,vd1为第一透镜的阿贝数,nd4为第四透镜的折射率,vd4为第四透镜的阿贝数,vd2为第二透镜的阿贝数,vd3为第三透镜的阿贝数,vd5为第五透镜的阿贝数,vd6为第六透镜的阿贝数,vd7为第七透镜的阿贝数,vd8为第八透镜的阿贝数。

[0018] Furthermore, the optical imaging system meets the following conditions: 3.0 <FOV / TTL<6.0;其中,FOV为光学成像系统最大视场角的一半,TTL为第一透镜物侧面至成像面的轴上距离。

[0019] Furthermore, the optical imaging system satisfies the following condition: TTL / f<16.5; wherein f is the effective focal length of the optical imaging system, and TTL is the on-axis distance from the object side of the first lens to the imaging surface.

[0020] Furthermore, the optical imaging system satisfies the following conditions: f*tan(FOV) / (DT1 / 2)<5.0; f*tan(FOV) / (DT2 / 2)<7.2; f*tan(FOV) / (DT3 / 2)<12.5; wherein f is the effective focal length of the optical system, FOV is half of the maximum field of view angle of the optical system imaging system, DT1 is the effective semi-aperture of the object side of the first lens, DT2 is the effective semi-aperture of the object side of the second lens, and DT3 is the effective semi-aperture of the object side of the third lens.

[0021] Further, the optical imaging system satisfies the following conditions: 3.2 < TTL / ImagH < 6.8; 18.0 < TTL / EPD < 28.0; wherein TTL is an on-axis distance from a first lens object side to an imaging surface, ImagH is half of a diagonal length of an effective pixel area on the imaging surface, and EPD is an entrance pupil diameter of the optical imaging lens.

[0022] In another aspect, the present application also provides a camera module comprising at least an optical lens, wherein the optical lens is installed with the above-mentioned confocal wide-angle optical imaging system.

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

[0024] The present application provides a confocal wide-angle optical imaging system and a camera module using the same, which mainly comprises eight lenses. The first lens has a negative focal power, the object side of which is a convex surface, and the image side is a concave surface. The second lens has a negative focal power, the object side of which is a convex surface, and the image side is a concave surface. The third lens has a negative focal power, the object side of which is a concave surface, and the image side is a concave surface. The fourth lens has a positive focal power, the object side of which is a convex surface. The fifth lens has a positive focal power, the object side of which is a convex surface, and the image side is a convex surface. The sixth lens has a focal power. The seventh lens has a focal power. The eighth lens has a positive focal power, and the image side is a convex surface. Through the reasonable matching of the shapes and focal powers of the lenses, the design requirements of a large field of view and high resolution of the optical imaging system are effectively met. The confocal wide-angle optical imaging system has the advantages of high pixel, confocal, wide angle, low cost, compact structure, and easy processing and installation. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiment description will be briefly introduced.

[0026] Figure 1 is a structural schematic diagram of an optical system or a camera module according to Embodiment 1 of the present application;

[0027] Figure 2 is an MTF curve of the optical system or the camera module according to Embodiment 1 of the present application in the visible light band;

[0028] Figure 3 is an MTF curve of the optical system or the camera module according to Embodiment 1 of the present application in the near-infrared band;

[0029] Figure 4 is a structural schematic diagram of an optical system or a camera module according to Embodiment 2 of the present application;

[0030] Figure 5 is an MTF curve of the optical system or the camera module according to Embodiment 2 of the present application in the visible light band;

[0031] Figure 6 is the MTF curve of the optical system or camera module in the near-infrared band of Example 2 of the present application;

[0032] Figure 7 Schematic diagram of the structure of the optical system or camera module according to Example 3 of the present application;

[0033] Figure 8 is the MTF curve of the optical system or camera module in the visible light band of Example 3 of the present application;

[0034] Figure 9 This is the MTF curve of the optical system or camera module in the near-infrared band of Example 3 of the present application. DETAILED DESCRIPTION

[0035] The present application provides a confocal wide-angle optical imaging system, which includes, along the optical axis, from the object plane to the image plane, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens;

[0036] The first lens has negative optical power, its object side surface is convex, and its image side surface is concave;

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

[0038] The third lens has negative optical power, and its object side surface is concave, and its image side surface is concave;

[0039] The fourth lens has positive refractive power and its object side surface is convex;

[0040] The fifth lens has positive refractive power, and its object-side surface is convex, and its image-side surface is convex;

[0041] The sixth lens has optical power;

[0042] The seventh lens has optical power;

[0043] The eighth lens has positive refractive power, and its image-side surface is convex.

[0044] 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 effectively meets the design requirements of the optical imaging system with a large field of view and high resolution. It has the advantages of high pixel, confocal, wide angle and low cost, compact structure, and easy processing and installation.

[0045] Further, as a preferred embodiment of the present application but not limited, the optical system satisfies the following condition: TTL / f<16.5, wherein 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 image plane. 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 the wide-angle requirement is realized.

[0046] Further, as a preferred embodiment of the present application but not limited, the optical system satisfies the following condition: 18.0

[0047] Further, as a preferred embodiment of the present application but not limited, the optical system satisfies the following condition: 3.0<FOV / TTL<6.0; wherein FOV is half of the maximum field of view angle of the optical imaging system, and TTL is the axial distance from the object side surface of the first lens to the image plane. By controlling the relationship between the field of view angle and the axial distance from the object side surface of the first lens to the image plane, a larger field of view angle is ensured while the size of the lens is effectively reduced.

[0048] Further, as a preferred embodiment of the present application but not limited, the optical system satisfies the following condition: 15<(vd1+vd4) / (nd1+nd4)<25; 150<vd2+vd3+vd5+vd8<230; 35<vd6+vd7<115; wherein nd1 is the refractive index of the first lens, vd1 is the Abbe number of the first lens, nd4 is the refractive index of the fourth lens, vd4 is the Abbe number of the fourth lens, vd2 is the Abbe number of the second lens, vd3 is the Abbe number of the third lens, vd5 is the Abbe number of the fifth lens, vd6 is the Abbe number of the sixth lens, vd6 is the Abbe number of the seventh lens, and vd8 is the Abbe number of the eighth lens. By reasonably controlling the refractive index and Abbe number of each lens, the aberration generated by the lens is corrected, and the resolving power of the lens is improved. In addition, the stability of the optical imaging performance at high and low temperatures is maximized.

[0049] Furthermore, as a preferred embodiment of the present invention, but not a limitation, the optical system satisfies the following conditions: |f1 / f| < 9.5, |f4 / f| < 5.5; where f is the effective focal length of the optical system, f1 is the effective focal length of the first lens, and f4 is the effective focal length of the fourth lens. By limiting the ratio of the effective focal lengths of the first and fourth lenses to the effective focal length of the optical system, the optical imaging system achieves a reasonable light deflection angle, effectively reducing sensitivity to component tolerances and improving the quality of the optical imaging system. At the same time, by balancing the relationship between focal lengths, the performance difference between the visible and infrared bands is corrected, ensuring minimal focal shift and high imaging quality in both bands.

[0050] Furthermore, as a preferred embodiment of the present invention, but not limiting, the optical system satisfies the following condition: |(f6 - f7) / (f6 + f7)| < 14, where f6 is the effective focal length of the sixth lens element, and f7 is the effective focal length of the seventh lens element. By controlling the relationship between the effective focal lengths of the sixth and seventh lenses, aberrations generated by the front element of the lens are effectively corrected, thereby improving the imaging quality of the lens.

[0051] Furthermore, as a preferred embodiment of the present invention, but not limiting, the optical system satisfies the following conditions: f*tan(FOV) / (DT1 / 2) < 5.0, f*tan(FOV) / (DT2 / 2) < 7.2, and f*tan(FOV) / (DT3 / 2) < 12.5; where f is the effective focal length of the optical system, FOV is half of the maximum field of view of the optical imaging system, DT1 is the effective half-aperture of the objective side of the first lens, DT2 is the effective half-aperture of the objective side of the second lens, and DT3 is the effective half-aperture of the objective side of the third lens. By effectively controlling the relationship between the focal length, the maximum field of view, and the lens aperture, the system size can be effectively compressed, achieving wide-angle characteristics, while also effectively controlling the aperture of the optical imaging system.

[0052] Furthermore, as a preferred embodiment of the present invention but not limiting, the optical system satisfies the following conditions: -5.0 <f234 / f678<3.0;其中, f234为第二透镜、第三透镜和第四透镜的有效组合焦距,f678为第六透镜、第七透镜和第八透镜的有效组合焦距。通过控制透镜间的组合焦距在合理的范围,能够使得其平衡整个系统产生的球差,进而对系统的球差进行控制,有利于提高系统的成像质量,同时,有效地保证了高低温下光学成像系统具有良好的性能。

[0053] Further, as a preferred embodiment of the present application but not limitation, the optical system satisfies the following condition: 3.2 < TTL / ImagH < 6.8; wherein, TTL is the on-axis distance from the first lens object side to the image plane, ImagH is half of the diagonal length of the effective pixel area on the image plane. By controlling the relationship between the total length of the optical system and the imaging area, it is beneficial to the increase of the field of view angle, while realizing the miniaturization of the high-pixel wide-angle lens. Specific embodiments:

[0055] Embodiment one,

[0056] The following refers to Figures 1 to 3 An optical imaging lens according to Embodiment 1 of the present application is described. Figure 1 A structural schematic diagram of the optical imaging lens according to Embodiment 1 of the present application is shown.

[0057] 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 stop STO, a fifth lens E5, a sixth lens E6, a seventh lens E7, an eighth lens E8, a filter E9, and an image plane S19.

[0058] The first lens E1 has a negative focal power, the object side S1 is a convex surface, and the image side S2 is a concave surface. The second lens E2 has a negative focal power, the object side S3 is a convex surface, and the image side S4 is a concave surface. The third lens E3 has a negative focal power, the object side S5 is a concave surface, and the image side S6 is a concave surface. The fourth lens E4 has a positive focal power, the object side S7 is a convex surface, and the image side S8 is a convex surface. The fifth lens E5 has a positive focal power, the object side S10 is a convex surface, and the image side S11 is a convex surface. The sixth lens E6 has a negative focal power, the object side S12 is a concave surface, and the image side S13 is a concave surface. The seventh lens E7 has a positive focal power, the object side S13 is a convex surface, and the image side S14 is a convex surface. The eighth lens E8 has a positive focal power, the object side S15 is a concave surface, and the image side S16 is a convex surface. The filter E9 has an object side S17 and an image side S18. Light from the object sequentially passes through each surface S1 to S18 and is finally imaged on the image plane S19.

[0059] Table 1 shows the surface type, curvature radius, thickness, and material of each lens of the optical imaging lens of Embodiment 1, wherein the units of the curvature radius and the thickness are millimeters (mm).

[0060] Table 1

[0061]

[0062] In Table 1, 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:

[0063]

[0064] 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 Example 1.

[0065] Table 2

[0066]

[0067] Example 2

[0068] The following reference Figures 4 to 6 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.

[0069] 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, an aperture STO, a fifth lens E5, a sixth lens E6, a seventh lens E7, a seventh lens E8, a filter E9 and an imaging surface S19.

[0070] The first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has 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 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 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 convex. 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.

[0071] 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).

[0072] Table 3

[0073]

[0074] 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:

[0075]

[0076] Where x is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the aspheric vertex, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th higher-order term in the aspheric surface shape formula. Table 4 shows the conic coefficients and higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 for various aspheric surfaces that can be used in the second embodiment.

[0077] Table 4

[0078]

[0079] Example 3:

[0080] The following reference Figures 7 to 9 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.

[0081] like Figure 7 As shown, the optical imaging lens according to an exemplary embodiment of the present application includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, an aperture STO, a fifth lens E5, a sixth lens E6, a seventh lens E7, a seventh lens E8, a filter E9 and an imaging surface S19.

[0082] The first lens E1 has negative refractive power, the object side surface S1 is convex, and the image side surface S2 is concave. The second lens E2 has negative refractive power, the object side surface S3 is convex, and the image side surface S4 is concave. The third lens E3 has negative refractive power, the object side surface S5 is concave, and the image side surface S6 is concave. The fourth lens E4 has positive refractive power, the object side surface S7 is convex, and the image side surface S8 is concave. The fifth lens E5 has positive refractive power, the object side surface S10 is convex, and the image side surface S11 is convex. The sixth lens E6 has positive refractive power, the object side surface S12 is convex, and the image side surface S13 is convex. The seventh lens E7 has negative refractive power, the object side surface S13 is concave, and the image side surface S14 is concave. The eighth lens E8 has positive refractive power, the object side surface S15 is convex, and the image side surface S16 is convex. The filter E9 has the object side surface S17 and the image side surface S18. The light from the object sequentially passes through the surfaces S1 to S18 and is finally imaged on the imaging surface S19.

[0083] Table 5 shows the surface type, the radius of curvature, the thickness and the material of each lens of the optical imaging lens of Example 3, wherein the units of the radius of curvature and the thickness are millimeter (mm).

[0084] Table 5

[0085]

[0086] In Table 5, the object side surface and the image side surface of each 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 type of each aspherical surface can be defined by, but not limited to, the following aspherical surface formula:

[0087]

[0088] 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 conic coefficient, and Ai is the coefficient corresponding to the i-th high order term in the aspherical surface formula. Table 6 shows the conic coefficient and the high order term coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 of each aspherical surface that can be used in the third embodiment.

[0089] Table 6

[0090]

[0091] In Examples 1-3, each conditional formula satisfies the conditions in the following table:

[0092] Table 7

[0093]

[0094] A camera module at least comprises an optical lens, the optical lens is internally provided with the above-mentioned confocal wide-angle optical imaging system, has the advantages of light high image quality, large wide angle and low cost, and can keep the confocal wide-angle lens in good and stable performance at high and low temperatures, has compact structure, is convenient for processing and installation, and can meet the use in multiple fields.

[0095] The above is one or more embodiments provided in combination with specific contents, and it is not considered that the specific implementation of the utility model is limited to these descriptions. Any approximation, similarity or replacement of the method and structure of the utility model, or any technical deduction or replacement under the concept of the utility model, should be regarded as the protection range of the utility model.

Claims

1. A confocal wide-angle optical imaging system comprising, in order from the object plane to the image plane along the optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, characterized in that: The first lens has negative optical power, its object side surface is convex, and its image side surface is concave; The second lens has negative optical power, its object side surface is convex, and its image side surface is concave; The third lens has negative optical power, and its object side surface is concave, and its image side surface is concave; The fourth lens has positive refractive power and its object side surface is convex; The fifth lens has positive refractive power, and its object-side surface is convex, and its image-side surface is convex; The sixth lens has optical power; The seventh lens has optical power; The eighth lens has positive refractive power, and its image-side surface is convex.

2. The confocal wide-angle optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following conditions: -5.0 < 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.

3. The confocal wide-angle optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following condition: |(f6-f7) / (f6+f7)|<14; Wherein, f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens.

4. The confocal wide-angle optical imaging system according to any one of claims 1 to 3, wherein: The optical imaging system meets the following conditions: | f1 / f | < 9.5; and / or | f4 / f |< 5.5; Wherein, f is the effective focal length of the optical imaging system, f1 is the effective focal length of the first lens, and f4 is the effective focal length of the fourth lens.

5. The confocal wide-angle optical imaging system according to any one of claims 1 to 3, wherein: The optical imaging system meets the following conditions: 15<(vd1+vd4) / (nd1+nd4)<25; 150< vd2+vd3+vd5+vd8< 230; 35< vd6+vd7< 115; Among them, nd1 is the refractive index of the first lens, vd1 is the Abbe number of the first lens, nd4 is the refractive index of the fourth lens, vd4 is the Abbe number of the fourth lens, vd2 is the Abbe number of the second lens, vd3 is the Abbe number of the third lens, vd5 is the Abbe number of the fifth lens, vd6 is the Abbe number of the sixth lens, vd7 is the Abbe number of the seventh lens, and vd8 is the Abbe number of the eighth lens.

6. The confocal wide-angle optical imaging system according to any one of claims 1 to 3, wherein: The optical imaging system meets the following conditions: 3.0 < FOV / TTL < 6.0; Wherein, FOV is half of the maximum field of view of the optical imaging system, and TTL is the on-axis distance from the object side of the first lens to the imaging surface.

7. The confocal wide-angle optical imaging system according to any one of claims 1 to 3, wherein: The optical imaging system meets the following conditions: TTL / f < 16.5; Wherein, f is the effective focal length of the optical imaging system, and TTL is the on-axis distance from the object side of the first lens to the imaging surface.

8. The confocal wide-angle optical imaging system according to any one of claims 1 to 3, wherein: The optical imaging system meets the following conditions: f*tan(FOV) / (DT1 / 2)<5.0; f*tan(FOV) / (DT2 / 2)<7.2; f*tan(FOV) / (DT3 / 2)<12.5; Wherein, f is the effective focal length of the optical system, FOV is half of the maximum field of view of the imaging system of the optical system, DT1 is the effective half-aperture of the object side of the first lens, DT2 is the effective half-aperture of the object side of the second lens, and DT3 is the effective half-aperture of the object side of the third lens.

9. The confocal wide-angle optical imaging system according to any one of claims 1 to 3, wherein: The optical imaging system meets the following conditions: 3.2 < TTL / ImagH < 6.8; and / or 18.0< TTL / EPD <28.0; Wherein, TTL is the on-axis distance from the object side of the first lens to the imaging plane, ImagH is half the diagonal length of the effective pixel area on the imaging plane, and EPD is the entrance pupil diameter of the optical imaging lens.

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

Images