Panoramic fisheye optical system and camera module using the same
Patent Information
- Application Number
- CN202611333119.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-08-31
- Publication Date
- 2026-10-20
AI Technical Summary
[0003]为解决超大视场、大相对孔径条件下像差校正困难，以及实际折转元件的装配光程难以在光学设计中准确预留的问题，本申请提供一种全景鱼眼光学系统，采用的技术方案为：
本申请采用十一枚成像透镜、折转元件及光阑的组合结构，通过前组负光焦度透镜逐级接收并压缩超大视场光束，由正负光焦度交替的中后组校正球差、彗差、场曲、像散和色差；折转元件在实际结构中使光路折转，并以平行平板形式纳入展开光路，使实际折转元件的光程和像差影响能够在光学设计阶段得到补偿。三个实施例均实现203°全视场角和约2.02的像方F数，并兼顾结构紧凑性、装配空间和成像质量。
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Abstract
Description
Technical Field
[0001] This application relates to the field of optical imaging, and more particularly to a panoramic fisheye optical system with a folding element optical path configuration and a camera module for its application. Background Technology
[0002] With the development of applications such as panoramic cameras, machine vision, intelligent driving, virtual reality, and security monitoring, lenses need to achieve a field of view exceeding hemispherical range within a limited volume, while simultaneously meeting the requirements of large relative aperture, high pixel count, and assembly stability. Fisheye optical systems, with their large incident light angle and high front group light height, are prone to significant field curvature, astigmatism, chromatic aberration, and higher-order aberrations. When the full field of view exceeds 200° and the image-side F-number reaches F / 2, the coordination between lens power, materials, and surface shape becomes particularly challenging. Actual camera modules may also require reserved optical path and assembly space for the prism structure. If the design model does not accurately account for this optical element, the back focal length, aberrations, and image plane position may shift after actual assembly. Summary of the Invention
[0003] To address the difficulties in aberration correction under ultra-large field of view and large relative aperture conditions, and the challenges in accurately reserving the optical path length for actual folding elements in optical design, this application provides a panoramic fisheye optical system, employing the following technical solution: A panoramic fisheye optical system comprises, in sequence from the object side to the image side along the light transmission direction, a first lens, a second lens, a third lens, a fourth lens, a folding element, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, and an eleventh lens; The first lens has negative optical power, its object side is convex, and its image side is concave. The second lens has negative optical power, its object side is convex, and its image side is concave. The third lens has positive optical power, and both its object-side and image-side surfaces are convex. The fourth lens has negative optical power, and both its object-side and image-side surfaces are concave. The folding element is located between the fourth lens and the fifth lens, and is used to fold the light beam passing through the fourth lens and direct it toward the fifth lens; in the optical design model of the unfolded optical path, the folding element is represented as a flat optical element with the light-incident surface and the light-outceasing surface parallel to each other. The fifth lens has positive optical power, and both its object-side and image-side surfaces are convex. The sixth lens has positive optical power, and both its object-side and image-side surfaces are convex. The seventh lens has negative optical power, and both its object-side and image-side surfaces are concave. The eighth lens has negative optical power, its object side is convex, and its image side is concave. The ninth lens has positive optical power, and both its object-side and image-side surfaces are convex. The tenth lens has negative optical power, its object side is concave, and its image side is convex. The eleventh lens has positive optical power, its object side is convex, and its image side is concave. The aperture stop is located between the fifth lens and the sixth lens.
[0004] Preferably, the first lens satisfies: Nd1 > 1.85, Vd1 < 42; where Nd1 and Vd1 are the refractive index and Abbe number of the first lens material, respectively.
[0005] Preferably, the optical system satisfies: 13.5 < |f123 / f| < 23.0; where f123 is the effective combined focal length of the first lens, the second lens, and the third lens, and f is the effective focal length of the optical system.
[0006] Preferably, the optical system satisfies: 5.7 < |f8 / f910| < 6.0; where f8 is the effective focal length of the eighth lens and f910 is the effective combined focal length of the ninth and tenth lenses.
[0007] Preferably, the optical system satisfies: 5.4 < f910 / f < 5.9; and / or Vd9 > 80, Vd10 < 22; wherein Vd9 and Vd10 are the Abbe numbers of the materials of the ninth and tenth lenses, respectively.
[0008] Preferably, the seventh lens satisfies: Nd7 > 1.65, Vd7 < 22; where Nd7 and Vd7 are the refractive index and Abbe number of the seventh lens material, respectively.
[0009] Preferably, the following condition is met: D1 / (Fno*Ymax)<1.8; where D1 is the maximum effective diameter of the first lens, Fno is the system image square F number, and Ymax is the system maximum image height.
[0010] Preferably, the following condition is met: 4.1 < TTL / (CT1+CT2+CT3+CT4+CT5) < 4.7; where TTL is the axial distance from the object side of the first lens to the imaging plane, and CT1 to CT5 are the center thicknesses of the first lens to the fifth lens, respectively.
[0011] Preferably, the aperture stop is located between the fifth lens and the sixth lens; and / or the full field of view of the optical system is not less than 200°, and the total length of the lens is not greater than 43mm.
[0012] On the other hand, this application embodiment also provides a camera module, which includes at least an image sensor and the above-mentioned panoramic fisheye optical system, with the image sensor located on the image side of the eleventh lens.
[0013] Compared with the prior art, the beneficial effects of this application are as follows: This application employs a combination structure of eleven imaging lenses, a folding element, and an aperture stop. The front group of negative power lenses sequentially receives and compresses the ultra-wide field-of-view beam, while the middle and rear groups, alternating between positive and negative power, correct spherical aberration, coma, field curvature, astigmatism, and chromatic aberration. In the actual structure, the folding element folds the optical path and is incorporated into the unfolded optical path in the form of a parallel plate, allowing the optical path length and aberration effects of the actual folding element to be compensated during the optical design stage. All three embodiments achieve a full field of view of 203° and an image-square F-number of approximately 2.02, while also considering structural compactness, assembly space, and image quality. Attached Figure Description
[0014] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments are briefly introduced below.
[0015] Figure 1 This is a schematic diagram of the optical path layout structure of the optical system in Embodiment 1 of this application; Figure 2 This is a field curvature curve diagram of the optical system of Embodiment 1 of this application; Figure 3 This is a schematic diagram of the optical path layout structure of the optical system in Embodiment 2 of this application; Figure 4 This is a field curvature curve diagram of the optical system of Embodiment 2 of this application; Figure 5 This is a schematic diagram of the optical path layout structure of the optical system in Embodiment 3 of this application; Figure 6 This is a field curvature curve diagram of the optical system of Embodiment 3 of this application. Detailed Implementation
[0016] This application provides a panoramic fisheye optical system, which includes, in sequence from the object side to the image side along the light transmission direction, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a folding element E5, a fifth lens E6, an aperture stop STO, a sixth lens E7, a seventh lens E8, an eighth lens E9, a ninth lens E10, a tenth lens E11, an eleventh lens E12, a filter E13, and an imaging surface.
[0017] Both the first lens E1 and the second lens E2 have negative optical power, used to receive incident light beams exceeding the hemispherical range and reduce the height of light rays on subsequent lenses; the object-side surface of the first lens E1 and the image-side surface of the second lens E2 are convex and concave respectively.
[0018] The third lens E3 has positive optical power and a biconvex shape. It, together with the first lens E1 and the second lens E2, forms a front group optical power transition to balance the coma and astigmatism generated by the ultra-large field of view.
[0019] The fourth lens E4 has negative optical power and is biconcave. An air gap is left between the fourth lens E4 and the third lens E3 to further adjust the angle and height of the beam incident on the folding element E5.
[0020] The folding element E5 is located between the fourth lens E4 and the fifth lens E6. The actual structure includes an incident surface, a folding surface, and an exiting surface. The folding surface changes the propagation direction of the light beam through total internal reflection or a reflective film. In the design model of the unfolded optical path, the incident surface S9 and the exiting surface S10 are represented as mutually parallel planes and are made of high refractive index optical materials.
[0021] The folding element E5 has the same or substantially the same equivalent optical path thickness as the folding element E5 actually assembled in the camera module; the rectangular plate shape in the unfolded model is only used to express the optical path relationship after the folding element E5 is unfolded, and does not indicate that the actual folding element E5 is an ordinary parallel plate, nor does it limit its folding angle and external contour.
[0022] The fifth lens E6 has positive optical power and a biconvex shape. It is located on the image side of the folding element E5 and is used to converge the light beam passing through the folding element E5 to the vicinity of the aperture stop STO.
[0023] The aperture stop STO is located between the fifth lens E6 and the sixth lens E7. It is used to limit the aperture of the beam entering the image-side lens group and to balance the aberrations of the front and rear groups.
[0024] The sixth lens E7 has positive optical power and is biconvex in shape, while the seventh lens E8 has negative optical power and is biconcave in shape. Together, they form a combination of positive and negative optical power on the image side of the aperture stop.
[0025] The eighth lens, E9, has negative optical power. Its object side is convex and its image side is concave. It is used to adjust the principal ray angle at the edge of the field of view and to share the responsibility for field curvature and astigmatism correction.
[0026] The ninth lens, E10, has positive optical power and is biconvex in shape, while the tenth lens, E11, has negative optical power. The curvature of its object side and image side is used to correct magnification chromatic aberration and higher aberrations.
[0027] The eleventh lens, E12, has positive optical power. Its object-side surface is convex and its image-side surface is concave, which is used to further converge the light beam and match the angle of the principal ray at the imaging surface with the image sensor.
[0028] Multiple surfaces in the second lens E2, the fourth lens E4, and the fifth lens E6 to the eleventh lens E12 are aspherical; each lens may be made of glass or optical resin material depending on the processing and assembly requirements.
[0029] Lenses E1 through E12 are lenses that participate in imaging and have optical power. The folding element E5 is counted separately as an element that changes the direction of the optical path and participates in the optical path configuration, and is not included in the number of the eleven imaging lenses.
[0030] This optical system, through the placement, power, and material configuration of eleven lenses, the E5 folding element, and the STO aperture stop, maintains a compact structure with a 203° full field of view and an F / 2 relative aperture, while reducing field curvature, astigmatism, coma, and chromatic aberration in ultra-wide-angle imaging.
[0031] Furthermore, the first lens E1 satisfies Nd1 > 1.85 and Vd1 < 42, where Nd1 is the refractive index of the first lens material and Vd1 is the Abbe number of the first lens material. The first lens E1 uses a material with a higher refractive index and a lower Abbe number, which can obtain the negative optical power required by the front group with a smaller curvature change, and is beneficial for controlling the height of the light rays at the edge of the ultra-large field of view.
[0032] Furthermore, the optical system satisfies 13.5 < |f123 / f| < 23.0, where f123 is the effective combined focal length of the first lens E1, the second lens E2, and the third lens E3, and f is the effective focal length of the optical system. By limiting the ratio of the combined focal length of the first three lenses to the effective focal length of the system, the negative and positive optical powers of the front group are reasonably distributed, which helps to compress ultra-large angle incident beams and balance the spherical aberration, coma, and astigmatism of the front group.
[0033] Furthermore, the optical system satisfies 5.7 < |f8 / f910| < 6.0, where f8 is the effective focal length of the eighth lens E9, and f910 is the effective combined focal length of the ninth lens E10 and the tenth lens E11. By limiting the effective focal length ratio of the eighth lens E9 with the combination of the ninth and tenth lenses, the optical power transition on the image side of the aperture stop can be adjusted, effectively correcting field curvature while taking into account the image quality of the center and edge fields.
[0034] Furthermore, the optical system satisfies 5.4 < f910 / f < 5.9, and Vd9 > 80 and Vd10 < 22, where f910 is the effective combined focal length of the ninth lens E10 and the tenth lens E11, f is the effective focal length of the optical system, and Vd9 and Vd10 are the Abbe numbers of the materials of the ninth lens E10 and the tenth lens E11, respectively. The ninth and tenth lenses use a combination of high and low dispersion materials, which can correct axial chromatic aberration and magnification chromatic aberration while controlling the height of the rear group light rays.
[0035] Furthermore, the seventh lens E8 satisfies Nd7 > 1.65 and Vd7 < 22, where Nd7 is the refractive index of the seventh lens material and Vd7 is the Abbe number of the seventh lens material. By controlling the refractive index and Abbe number of the seventh lens material, it is possible to balance chromatic aberration and image quality fluctuations caused by temperature changes in conjunction with adjacent positive power lenses.
[0036] Furthermore, the optical system satisfies D1 / (Fno*Ymax) < 1.8, where D1 is the maximum effective diameter of the first lens E1, Fno is the image-side F-number of the system, and Ymax is the maximum image height of the system. By limiting the relationship between the maximum effective diameter, image-side F-number, and maximum image height of the first lens E1, the front port diameter can be controlled while ensuring a 203° field of view and F / 2-stop light transmission capability.
[0037] Furthermore, the optical system satisfies 4.1 < TTL / (CT1+CT2+CT3+CT4+CT5) < 4.7, where TTL is the axial distance from the object side of the first lens to the imaging plane, and CT1 to CT5 are the center thicknesses of the first to fifth lenses, respectively. By rationally configuring the ratio of the total system length to the sum of the center thicknesses of the first five lenses, structural compactness, lens strength, fabrication feasibility, and assembly sensitivity can be balanced.
[0038] Furthermore, the folding element E5 in the unfolded optical path of this design uses H-ZLAF90 material, and the light-incident surface and the light-outceasing surface are planar. In actual assembly, a prism or reflective folding structure with corresponding equivalent optical path and folding angle can be adopted according to the spatial layout of the camera module.
[0039] Furthermore, the aspherical surface shape can be defined by the following formula:
[0040] Specifically, as a preferred embodiment of the present invention and not a limitation thereof, the following references are made. Figures 1 to 2 Example 1 is described. Figure 1 The optical path layout structure of the optical system of Embodiment 1 is shown. Figure 2 The field curve of Example 1 is shown.
[0041] like Figure 1 As shown, Embodiment 1 includes, in sequence along the light transmission direction, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a folding element E5, a fifth lens E6, an aperture stop STO, a sixth lens E7, a seventh lens E8, an eighth lens E9, a ninth lens E10, a tenth lens E11, an eleventh lens E12, a filter E13, and an imaging surface.
[0042] In Example 1, the optical powers of the eleven lenses are sequentially negative, negative, positive, negative, positive, positive, negative, positive, negative, positive, negative, positive. The surfaces of each lens, folding element, filter, and imaging plane are labeled S1 to S28 according to the order of light propagation. The incident and exit surfaces of the folding element E5 are labeled S9 and S10, respectively, and the aperture stop is labeled STO. The optical surfaces after the aperture stop are numbered sequentially starting from S14. The object-side and image-side surfaces of the filter E13 are labeled S26 and S27, respectively, and the imaging plane is labeled S28. Light from the object passes through the aforementioned optical surfaces sequentially and forms an image on the imaging plane.
[0043] Table 1 shows the surface type, radius of curvature, axial thickness, and material of each optical surface in Example 1, where the units for radius of curvature and thickness are millimeters (mm), and Infinity indicates a plane.
[0044] Table 1: Basic parameters of the optical system in Example 1
[0045] In Table 1, multiple surfaces of the second lens E2, the fourth lens E4, and the fifth lens E6 to the eleventh lens E12 are aspherical surfaces, and each aspherical surface can be defined using the above-mentioned aspherical surface formula.
[0046]
[0047] Where k is the conic coefficient, and A4 to A20 are the coefficients of the higher-order terms corresponding to the even-order terms; Table 2 gives the conic coefficients and higher-order term coefficients of each aspherical surface in Example 1.
[0048] Table 2: Aspherical correlation values of the lens surface in Example 1
[0049] Specifically, see the following references Figures 3 to 4 Description of Example 2. Figure 3 The optical path layout structure of the lens of the optical system in Embodiment 2 is shown. Figure 4 The field curvature curve of the optical system of Example 2 is shown.
[0050] like Figure 3 As shown, Embodiment 2 includes, in sequence along the light transmission direction, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a folding element E5, a fifth lens E6, an aperture stop STO, a sixth lens E7, a seventh lens E8, an eighth lens E9, a ninth lens E10, a tenth lens E11, an eleventh lens E12, a filter E13, and an imaging surface.
[0051] In Example 2, the optical powers of the eleven lenses are sequentially negative, negative, positive, negative, positive, positive, negative, positive, negative, positive, negative, positive. The surfaces of each lens, folding element, filter, and imaging plane are labeled S1 to S28 according to the order of light propagation. The incident and exit surfaces of the folding element E5 are labeled S9 and S10, and the aperture stop is labeled STO. The optical surfaces after the aperture stop are numbered sequentially starting from S14. The object-side and image-side surfaces of the filter E13 are labeled S26 and S27, respectively, and the imaging plane is labeled S28. Light from the object passes through the aforementioned optical surfaces sequentially and forms an image on the imaging plane.
[0052] The component sequence and lens power configuration of Embodiment 2 are the same as those of Embodiment 1. The folding element E5 is located between the fourth lens E4 and the fifth lens E6, and the aperture stop STO is located between the fifth lens E6 and the sixth lens E7.
[0053] Example 2 adjusts the radius of curvature, axial spacing, effective focal length, and aspherical coefficient of each lens to adjust the effective focal length of the system to 3.01 mm, while maintaining a full field of view of 203° and an image-side F number of approximately 2.01.
[0054] Table 3 shows the surface type, radius of curvature, axial thickness, and material of each optical surface in Example 2, where the units for radius of curvature and thickness are millimeters (mm).
[0055] Table 3: Basic parameters of the optical system in Example 2
[0056] The surfaces listed in Table 3 are aspherical, and the shape of each aspherical surface is defined by the conic coefficient and the coefficient of the even-order term.
[0057]
[0058] Table 4 shows the conic coefficients and higher-order coefficients A4 to A20 for each aspherical surface in Example 2.
[0059] Table 4: Aspherical correlation values of the lens surface in Example 2
[0060] Specifically, see the following references Figures 5 to 6 Description of Example 3. Figure 5 The optical path layout structure of the optical system in Embodiment 3 is shown. Figure 6 The field curvature curve of the optical system of Example 3 is shown.
[0061] like Figure 5As shown, Embodiment 3 includes, in sequence along the light transmission direction, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a folding element E5, a fifth lens E6, an aperture stop STO, a sixth lens E7, a seventh lens E8, an eighth lens E9, a ninth lens E10, a tenth lens E11, an eleventh lens E12, a filter E13, and an imaging surface.
[0062] In Example 3, the optical powers of the eleven lenses are sequentially negative, negative, positive, negative, positive, positive, negative, positive, negative, positive, negative, positive. The surfaces of each lens, folding element, filter, and imaging plane are labeled S1 to S28 according to the order of light propagation. The incident and exit surfaces of the folding element E5 are labeled S9 and S10, and the aperture stop is labeled STO. The optical surfaces after the aperture stop are numbered sequentially starting from S14. The object-side and image-side surfaces of the filter E13 are labeled S26 and S27, respectively, and the imaging plane is labeled S28. Light from the object passes through the aforementioned optical surfaces sequentially and forms an image on the imaging plane.
[0063] The component sequence and lens optical power configuration of Example 3 are the same as those of Example 1. The light-incident surface and light-outcident surface of the folding element E5 are both planar.
[0064] Example 3 adjusts the curvature radius of the first and third lenses and the effective focal length of the system to make the effective focal length of the system 3.10mm, while maintaining a full field of view of 203° and an image-side F number of about 2.05.
[0065] Table 5 shows the surface type, radius of curvature, axial thickness, and material of each optical surface in Example 3, where the units for radius of curvature and thickness are millimeters (mm).
[0066] Table 5: Basic parameters of the optical system in Example 3
[0067] The surfaces listed in Table 5 are aspherical, and the shape of each aspherical surface is defined by the conic coefficient and the coefficient of the even-order term.
[0068]
[0069] Table 6 shows the conic coefficients and higher-order coefficients A4 to A20 for each aspherical surface in Example 3.
[0070] Table 6: Aspherical Correlation Values of Lens Surface in Example 3
[0071] The focal lengths of each lens, the effective focal length of the system, the combined focal length, the total length of the lens, the image-side F-number, and the full field of view in Examples 1-3 are summarized in Table 7 below.
[0072] Table 7: Basic Data for Examples 1-3
[0073] The calculation results of each main conditional expression in Examples 1-3 are shown in Table 8 below: Table 8: Conditional Expressions for Examples 1-3
[0074] This application also provides a camera module, which includes at least an image sensor and the aforementioned panoramic fisheye optical system. Eleven lenses are responsible for imaging and aberration correction, and a folding element is used to change the direction of beam propagation, with its optical path effect taken into account in the unfolded model; a filter E13 is disposed between the eleventh lens E12 and the imaging surface S28, and the image sensor is disposed at the imaging surface S28 to receive the image formed by the convergence of the optical system.
[0075] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any equivalent adjustments or substitutions made to the lens material, curvature, spacing, aspherical coefficient, or specific structure of the folding element under the concept of this application shall fall within the protection scope of this application.
Claims
1. A panoramic fisheye optical system, characterized in that: Along the direction of light transmission from the object side to the image side, the lens consists of a first lens, a second lens, a third lens, a fourth lens, a folding element, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, and an eleventh lens. The first lens has negative optical power, its object side is convex, and its image side is concave. The second lens has negative optical power, its object side is convex, and its image side is concave. The third lens has positive optical power, and both its object-side and image-side surfaces are convex. The fourth lens has negative optical power, and both its object-side and image-side surfaces are concave. The folding element is located between the fourth lens and the fifth lens, and is used to fold the light beam passing through the fourth lens and direct it toward the fifth lens; in the optical design model of the unfolded optical path, the folding element is represented as a flat optical element with the light-incident surface and the light-outceasing surface parallel to each other; The fifth lens has positive optical power, and both its object-side and image-side surfaces are convex. The sixth lens has positive optical power, and both its object-side and image-side surfaces are convex. The seventh lens has negative optical power, and both its object-side and image-side surfaces are concave. The eighth lens has negative optical power, its object side is convex, and its image side is concave. The ninth lens has positive optical power, and both its object-side and image-side surfaces are convex. The tenth lens has negative optical power, its object side is concave, and its image side is convex. The eleventh lens has positive optical power, its object side is convex, and its image side is concave. An aperture stop is provided between the fifth lens and the sixth lens.
2. The panoramic fisheye optical system according to claim 1, characterized in that, The first lens satisfies: Nd1 > 1.85, Vd1 < 42; Where Nd1 is the refractive index of the first lens material and Vd1 is the Abbe number of the first lens material.
3. The panoramic fisheye optical system according to claim 1, characterized in that, The optical system satisfies: 13.5 < |f123 / f| < 23.0; Where f123 is the effective combined focal length of the first lens, the second lens and the third lens, and f is the effective focal length of the optical system.
4. The panoramic fisheye optical system according to claim 1, characterized in that, The optical system satisfies: 5.7 < |f8 / f910| < 6.0; Where f8 is the effective focal length of the eighth lens, and f910 is the effective combined focal length of the ninth and tenth lenses.
5. The panoramic fisheye optical system according to any one of claims 1-4, characterized in that, The optical system satisfies: 5.4 < f910 / f < 5.9; and / or Vd9 > 80, Vd10 < 22; Among them, Vd9 and Vd10 are the Abbe numbers of the materials of the ninth and tenth lenses, respectively; f910 is the effective combined focal length of the ninth and tenth lenses, and f is the effective focal length of the optical system.
6. The panoramic fisheye optical system according to any one of claims 1-4, characterized in that, The seventh lens satisfies: Nd7 > 1.65, Vd7 < 22; Where Nd7 is the refractive index of the seventh lens material and Vd7 is the Abbe number of the seventh lens material.
7. The panoramic fisheye optical system according to any one of claims 1-4, characterized in that, The optical system satisfies: D1 / (Fno*Ymax) < 1.8; Where D1 is the maximum effective diameter of the first lens, Fno is the system image square F number, and Ymax is the system maximum image height.
8. The panoramic fisheye optical system according to any one of claims 1-4, characterized in that, The optical system satisfies: 4.1 < TTL / (CT1+CT2+CT3+CT4+CT5) < 4.7; Where TTL is the axial distance from the object side of the first lens to the imaging plane, and CT1 to CT5 are the center thicknesses of the first lens to the fifth lens, respectively.
9. The panoramic fisheye optical system according to any one of claims 1-4, characterized in that, The aperture stop is located between the fifth and sixth lenses; and / or The optical system has a full field of view of not less than 200° and a total lens length of not more than 43mm.
10. A camera module, comprising at least an image sensor, characterized in that, It also includes the panoramic fisheye optical system according to any one of claims 1-9, wherein the image sensor is located on the image side of the eleventh lens.