High-resolution fisheye lens

Abstract

The invention discloses a high-resolution fisheye lens, which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens which are sequentially arranged from an object side to an image side, and meets the following conditions: 1.4 < = f < = 1.5, 1.45 lt; f1 / f2lt; 1.78, 0.96 lt, 1.78, 0.96 lt; f2 / f3lt; 1.23, 0.94 lt, 1.23, 0.94 lt; f5 / f6lt; 1.35, 0.78 lt, 1.35, 0.78 lt; f9 / f10lt; and 1.0. By reasonably setting the lens and the focal length, the high-resolution fisheye lens meets the requirements of small size, light weight, large target surface, low total length, high edge pixel number and large working distance under a large field angle, is low in cost, and is beneficial to reducing the manufacturing difficulty and improving the yield.

Description

Technical Field

[0001] The invention belongs to the technical field of optical lenses, and in particular relates to a high-resolution fisheye lens. Background Art

[0002] As a type of ultra-wide-angle optical system, fisheye lenses can capture scene information covering nearly a hemispherical area in a single frame, offering irreplaceable advantages in real-time panoramic imaging. Using biomimetic principles to simulate the water-surface perspective of a fisheye, this lens achieves full-airspace gaze without the need for mechanical scanning or multi-lens stitching. It is widely used in intelligent security, in-vehicle surround view, drone navigation, virtual reality, and other fields. Its core value lies in balancing a large field of view with real-time requirements. In particular, in scenarios such as dynamic target tracking and environmental situational awareness, the wide-angle nature of fisheye lenses significantly improves information acquisition efficiency, making them a key component of modern optical imaging systems.

[0003] Traditional fisheye lenses, in their pursuit of ultra-wide-angle imaging, have long faced multiple trade-offs between size, distortion, and cost. While stacking multiple lenses or using aspherical surfaces can theoretically expand the field of view and suppress some aberrations, in practice, the excessive complexity of the optical system often leads to excessively large dimensions, making it difficult to meet the rigid miniaturization requirements of drones and smart wearable devices. Furthermore, barrel distortion (F-THETA) caused by the wide field of view is particularly problematic. Traditional solutions often exhibit negative distortion, resulting in severe image stretching at the edges, necessitating post-process correction that sacrifices resolution in exchange for geometric accuracy. Furthermore, to balance aberrations, many designs rely on costly aspherical lenses or specialized coating processes, further driving up manufacturing costs. Furthermore, environmental compatibility issues such as insufficient thermal stability over a wide temperature range and difficulty achieving confocality between the visible and infrared wavelengths limit their potential for applications such as in-vehicle surveillance and industrial inspection. In addition, with the iteration of image sensor technology, chips with a large target area of ​​1 / 1.8 inches and a tiny pixel size of 1.55μm have put forward higher requirements on the resolution of the lens. Traditional designs often have insufficient pixel density in the edge field of view, resulting in loss of details and making it difficult to meet the needs of high-definition imaging. Summary of the Invention

[0004] To address the above problems, the present invention proposes a high-resolution fisheye lens that meets the requirements of small and lightweight, large target area, short total length, high edge pixel count and large working distance under a large field of view, and has low cost, which helps to reduce manufacturing difficulty and improve yield.

[0005] To achieve the above object, the technical solution adopted by the present invention is: The present invention provides a high-resolution fisheye lens, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens, which are arranged in sequence from the object side to the image side and meet the following conditions: 1.2≤f≤1.6, 1.15<|f1 / f2|<1.85, 0.8<|f2 / f3|<1.55, 0.75<|f5 / f6|<1.55, 0.56<|f9 / f 10 |<1.35; Among them, f is the effective focal length of the high-resolution fisheye lens, f1, f2, f3, f5, f6, f9, f 10 These are the focal lengths of the first lens, the second lens, the third lens, the fifth lens, the sixth lens, the ninth lens, and the tenth lens, all in mm.

[0006] Preferably, the high-resolution fisheye lens also meets the following conditions: -18.5 <f1<-11.2,-12.5<f2<-8.1,6.7<f3<10.5,-4.5<f4<-2.2,-6.3<f5<-3.2, 2.7 <f6<6.1,4.2<f7<8.5,5.1<f8<7.9,-7.6<f9<-2.4,3.5<f 10 <8.9; Among them, f4, f7, and f8 are the focal lengths of the fourth lens, the seventh lens, and the eighth lens, respectively, in mm.

[0007] Preferably, the object side surface curvature radius of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens and the tenth lens is 11.5 respectively. <R 11 <23.6, 13.1 <R 21 <27.1, 13.3 <R 31 <20.7, -18.2 <R 41 <-9.1, -100 <R 51 <200, 2.1 <R 61 <10.7, 3.7 <R 71 <50.5, -25.7 <R 81 <-2.2, -12.6 <R 91 <2, -5 <R 101 <30.5, the image side curvature radius corresponds to 2.3 <R 12 <12.8, 2.1 <R 22 <10.9, -30 <R 32 <-3,0 <R42 <9.6, 2.1 <R 52 <10.7, -30.5 <R 62 <-6.2, -11.5 <R 72 <-2.1, -10 <R 82 <0, -23.2 <R 92 <-2, -11.1 <R 102 <-2.1, unit: mm.

[0008] Preferably, the third lens and the fourth lens form a first cemented lens group, the fifth lens and the sixth lens form a second cemented lens group, and the eighth lens and the ninth lens form a third cemented lens group.

[0009] Preferably, the first lens and the second lens are both convex-concave glass spherical lenses, the third lens, the sixth lens and the seventh lens are all biconvex glass spherical lenses, the fourth lens is a biconcave glass spherical lens, the fifth lens is a plano-concave glass spherical lens or a convex-concave glass spherical lens, the eighth lens and the ninth lens are both concave-convex glass spherical lenses, and the tenth lens is a biconvex glass aspherical lens.

[0010] Preferably, the high-resolution fisheye lens also meets the following conditions: 1.8 <n d1 <2.01, 1.5 <n d2 <1.7, 1.7 <n d3 <1.9, 1.4 <n d4 <1.65, 1.7 <n d5 <1.9, 1.7 <n d6 <1.9, 1.4 <n d7 <1.65, 1.4 <n d8 <1.65, 1.7 <n d9 <1.9, 1.5 <n d10 <1.8; 20 <v d1 <30, 40 <v d2 <60,15 <v d3 <35, 50 <v d4 <75,30 <v d5 <50, 15 <v d6 <35, 60 <v d7 <80,50 <v d8 <75,15 <v d9 <35, 50 <v d10 <75; Among them, n d1 ~ n d10are the refractive indices of the first to tenth lenses, v d1 ~ v d10 These are the Abbe numbers of the first to tenth lenses, respectively.

[0011] Preferably, an aperture stop is further provided between the sixth lens and the seventh lens.

[0012] Preferably, the high-resolution fisheye lens also meets the following conditions: 0.4 <SL / TTL<0.47,0.13<Bfl / TTL<0.2,4°<φ<10°; Where SL is the distance from the aperture stop to the image plane in mm, Bfl is the back focus in mm, TTL is the total optical length in mm, and φ is the principal ray angle of incidence.

[0013] Preferably, the high-resolution fisheye lens has a field of view (FOV) greater than or equal to 195°, an F number of 2.0-2.1, and a total optical length (TTL) less than or equal to 30 mm.

[0014] Preferably, the operating wavelength band of the high-resolution fisheye lens is 435nm~656nm for visible light and 830nm~870nm for infrared light.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1) Ultra-wide-angle and high-pixel-density design: Through an innovative "positive distortion control" architecture, nine glass spherical lenses and one glass aspherical lens are used for coordinated correction, and a well-defined focal length ratio is employed. This ensures a field of view ≥195° while reducing the total optical length to less than 30mm, significantly improving spatial adaptability. Compared to the negative distortion characteristics of existing technologies, F-THETA distortion is controlled to +15%-+20%. Furthermore, the optical path is modulated by shifting the aperture stop forward and adjusting the rear negative lens. Specifically, the aperture stop position is optimized to change the incident angle of the principal ray. The rear negative lens then performs secondary modulation on the peripheral rays, shifting the originally outward-diffused optical path to an inward-converging one. This actively compresses the peripheral field of view rays toward the center, resulting in a higher pixel density at the sensor edge of the image plane. This increases the pixel density per unit field of view to 23 pixels per unit angle of view (compared to ≤18 with traditional solutions, an increase of nearly 30%), facilitating distortion correction using later algorithms. This forward distortion strategy also significantly improves edge resolution, enabling the lens to achieve an ultimate resolution of over 323 lp / mm in the visible light range when adapted to 1.55μm pixels. This represents a nearly 30% improvement in edge resolution, meeting the high-definition requirements of large-format sensors (1 / 1.8") and the wide working distance requirements for imaging from 500mm to infinity. This provides an optical solution that combines high resolution, low distortion, and strong environmental robustness for scenarios such as intelligent security and autonomous driving surround-view systems.

[0016] 2) Compact Structure and High Environmental Stability: Optimizing the aperture stop position (SL / TTL = 0.4-0.47), back focus ratio (Bf / TTL = 0.13-0.2), and chief ray angle of incidence (φ < 10°) achieves a large clear aperture of F-number 2.0-2.1 within the constraint of a total optical length of ≤30mm. Utilizing low-dispersion glass and thermally compensated bonding technology, the camera maintains confocal stability over a wide temperature range of -40°C to +70°C. The MTF curve offset for the visible light band (435-656nm) and the infrared band (830-870nm) is controlled within 5%, enabling seamless switching between day and night imaging.

[0017] 3) Low-cost and high-yield manufacturing: The front optical group (lenses 1 through 6) utilizes all-glass spherical lenses with decreasing apertures, while the rear optical group utilizes a glass aspherical lens (lens 10) to provide the primary focal length. Combined with a progressively increasing aperture design (lenses 7 through 10), this reduces tolerance sensitivity while controlling the size of the rear optical group. The standardized processing of all-glass spherical lenses and the minimized proportion of glass aspherical lenses (retaining a 90% spherical lens ratio with only one aspherical lens) leverage the advantages of aspherical lenses for precise correction of high-order aberrations while reducing manufacturing costs by 40% and increasing yield by 20% compared to a full aspherical solution, making it suitable for large-scale consumer production. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the structure of the high-resolution fisheye lens of the present invention; Figure 2 This is the optical path diagram of the high-resolution fisheye lens of the present invention; Figure 3 This is a visible spectrum MTF diagram of an embodiment of the present invention; Figure 4 This is an infrared spectrum MTF diagram of an embodiment of the present invention; Figure 5 Graphs showing field curvature and distortion according to an embodiment of the present invention.

[0019] Reference numerals: L1, first lens; L2, second lens; L3, third lens; L4, fourth lens; L5, fifth lens; L6, sixth lens; L7, seventh lens; L8, eighth lens; L9, ninth lens; L10, tenth lens; ST, aperture stop; IR, filter; CG, cover glass; IMA, image plane. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0021] It should be noted that, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0022] like Figure 1-Figure 5 As shown, a high-resolution fisheye lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, and a tenth lens L10, which are arranged in sequence from the object side to the image side and meet the following conditions: 1.2≤f≤1.6, 1.15<|f1 / f2|<1.85, 0.8<|f2 / f3|<1.55, 0.75<|f5 / f6|<1.55, 0.56<|f9 / f 10 |<1.35; Among them, f is the effective focal length of the high-resolution fisheye lens, f1, f2, f3, f5, f6, f9, f 10 5. These are the focal lengths of the first lens L1, the second lens L2, the third lens L3, the fifth lens L5, the sixth lens L6, the ninth lens L9 and the tenth lens L10, all in mm.

[0023] This high-resolution fisheye lens comprises ten elements. When the ratio 1.15 < |f1 / f2| < 1.85 is met, this prevents excessive divergence from the second lens element, L2, which results in an insufficient field of view, while also preventing insufficient divergence from the first lens element, L1, which would otherwise increase the burden of subsequent aberration correction. Both the first and second lens elements, L1 and L2, have negative optical powers. This ratio limits the matching of their divergence strengths, balancing the divergence of the front group and providing the basis for the subsequent forward movement of the aperture stop ST to suppress barrel distortion. When the ratio 0.8 < |f2 / f3| < 1.55 is met, the focal length ratio of the second lens element, L2 (e.g., with negative power), to the third lens element, L3 (e.g., with positive power), controls the smooth transition from divergence to convergence. The opposite optical powers of the second and third lenses, L2 and L3, synergistically correct coma, limit the convergence strength of the third lens element, and prevent excessive accumulation of spherical aberration. This optimized ratio reduces focus shift across a wide spectrum (435-870nm), improving day and night parfocal stability. Satisfying 0.75<|f5 / f6|<1.55 ensures that the negative power of the fifth lens L5 is sufficiently divergent to offset the astigmatism of the peripheral field of view and prevents the sixth lens L6 from over-converging and causing field curvature reversal. The fifth lens L5 (if negative power) and the sixth lens L6 (if positive power) preferably form a second cemented group. This ratio can adjust the compensation effect of the two on field curvature. Satisfying 0.56<|f9 / f 10 |<1.35. By optimizing the ratio and combining it with the correction of the tenth lens L10 (preferably an aspheric surface), the number of pixels per unit field angle at the edge can be increased, while the positive power of the tenth lens L10 can be limited to prevent excessive convergence of marginal light rays from causing uncontrolled positive distortion. This ensures that the power directions of the ninth lens L9 and the tenth lens L10 are opposite, synergistically compressing the optical path and reducing the total optical length.

[0024] In one embodiment, the high-resolution fisheye lens further satisfies the following conditions: -18.5 <f1<-11.2,-12.5<f2<-8.1,6.7<f3<10.5,-4.5<f4<-2.2,-6.3<f5<-3.2, 2.7 <f6<6.1,4.2<f7<8.5,5.1<f8<7.9,-7.6<f9<-2.4,3.5<f 10 <8.9; Wherein, f4, f7, and f8 are the focal lengths of the fourth lens L4, the seventh lens L7, and the eighth lens L8, respectively, and the unit is mm.

[0025] The first lens element, L1, serves as the first incident lens. Its negative power rapidly diverges light, extending the field of view to nearly 180° while reducing the incident height of marginal rays, alleviating the aberration burden on subsequent lenses. This divergence allows for subsequent positive distortion control, preventing premature convergence of marginal rays and the accumulation of negative distortion. The second lens element, L2, continues the divergence effect of the first lens element, further expanding the field of view. Its surface profile smoothes light transitions, preventing sharp deflections and astigmatism. Together with the first lens element, L1, it forms a negative-power dual-lens group, maintaining parfocal stability across a wide spectrum and minimizing focus shift in the infrared. The two negative elements work together to reduce the incident angle of marginal rays, providing the basis for shifting the aperture stop ST forward (between the sixth and seventh lenses, L6 and L7), improving light uniformity. The third lens element, L3, uses positive power to initially converge the diverging light rays from the first two negative lens elements, raising the height of the principal ray and balancing the optical path difference between the center and the edge of the field of view. This convergence, in conjunction with the subsequent aperture stop ST, limits the light inclination angle (φ < 10°) and suppresses barrel distortion. The convergence of light here reduces the beam diameter and also improves illumination. The fourth lens element, L4, uses negative power to secondary diverge the converged light rays from the third lens element, L3, correcting for residual spherical aberration and field curvature in the front group. Cemented together with the third lens element, L3, to form the first cemented group, it utilizes the refractive index difference between high- and low-dispersion glass to offset axial chromatic aberration and reduce lateral chromatic aberration (purple fringing). The diverging optical path compresses the total optical length, adapting to miniaturization requirements within 30mm. The fifth lens element, L5, employs negative power to further diverge light, suppressing field curvature at the periphery of the field of view. Its optimized surface geometry reduces assembly sensitivity and improves yield. It is cemented with the sixth lens element, L6, to form a second cemented element. A thermally stable adhesive is used at the bonding interface to ensure crack-free bonding at temperatures between -40°C and +70°C, maintaining MTF stability in the infrared band. The sixth lens element, L6, utilizes positive power to strongly converge the divergent light from the fifth lens element, L5, improving central field resolution and providing an ideal incident light cone for the aperture stop (ST). Cemented with the fifth lens element, L5 counteracts chromatic aberration, achieving a maximum spatial frequency of 323 lp / mm, compatible with 1.55μm pixel sizes. The forward movement of the aperture stop (ST), combined with the converging effect of the sixth lens element, actively introduces positive distortion (+15% to +20%), increasing the pixel density at the periphery to 23 pixels per degree. The seventh lens element, L7, utilizes positive focal power to further converge light, compressing the beam diameter and minimizing marginal light deflection. The symmetrical surface design of the sixth and seventh lenses, L6 and L7, reduces manufacturing complexity and significantly reduces tolerance sensitivity compared to aspheric solutions. It also collaborates with the sixth lens element, L6, to reduce the spot size, improve marginal illumination, and avoid vignetting. The eighth lens element, L8, gently deflects light, corrects coma, and balances optical path symmetry. Cemented with the ninth lens element, L9, to form the third cemented group, the negative-positive focal power combined with marginal light path compression maintains positive distortion distribution. Furthermore, the thermal expansion coefficients of the cemented group materials are matched, ensuring focus shift of less than 5μm at high temperatures.The ninth lens element, L9, utilizes negative power to moderately diverge the light from the eighth lens element, L8, suppressing marginal astigmatism. Cemented together with the eighth lens element, L8, it counteracts lateral chromatic aberration and reduces chromatic aberration in the visible and infrared bands. The negative power compresses the rear aperture, adapting to the requirements of large sensor formats (1 / 1.8") and complementing the tenth lens element, L10, in terms of optical power. The tenth lens element, L10 (preferably an aspherical surface), precisely controls the light convergence angle, smoothly projecting marginal light onto the image plane, counteracting spherical aberration and correcting residual distortion.

[0026] In one embodiment, the object side surface curvature radius of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9 and the tenth lens L10 is 11.5 respectively. <R 11 <23.6, 13.1 <R 21 <27.1, 13.3 <R 31 <20.7, -18.2 <R 41 <-9.1, -100 <R 51 <200, 2.1 <R 61 <10.7, 3.7 <R 71 <50.5, -25.7 <R 81 <-2.2, -12.6 <R 91 <2, -5 <R 101 <30.5, the image side curvature radius corresponds to 2.3 <R 12 <12.8, 2.1 <R 22 <10.9, -30 <R 32 <-3,0 <R 42 <9.6, 2.1 <R 52 <10.7, -30.5 <R 62 <-6.2, -11.5 <R 72 <-2.1, -10 <R 82 <0, -23.2 <R 92 <-2, -11.1 <R 102 <-2.1, unit: mm. Clear imaging is possible at operating temperatures of -40°C to +70°C.

[0027] In one embodiment, the third lens L3 and the fourth lens L4 form a first cemented lens group, the fifth lens L5 and the sixth lens L6 form a second cemented lens group, and the eighth lens L8 and the ninth lens L9 form a third cemented lens group. Each cemented lens group achieves high resolution by alternating positive and negative optical powers to offset spherical aberration and coma.

[0028] In one embodiment, the first lens L1 and the second lens L2 are both convex-concave glass spherical lenses; the third lens L3, the sixth lens L6, and the seventh lens L7 are all biconvex glass spherical lenses; the fourth lens L4 is a biconcave glass spherical lens; the fifth lens L5 is either a plano-concave glass spherical lens or a convex-concave glass spherical lens; the eighth lens L8 and the ninth lens L9 are both concave-convex glass spherical lenses; and the tenth lens L10 is a biconvex glass aspherical lens. This architecture utilizes only a single aspherical surface, improving edge resolution while reducing overall cost.

[0029] In one embodiment, the high-resolution fisheye lens further satisfies the following conditions: 1.8 <n d1 <2.01, 1.5 <n d2 <1.7, 1.7 <n d3 <1.9, 1.4 <n d4 <1.65, 1.7 <n d5 <1.9, 1.7 <n d6 <1.9, 1.4 <n d7 <1.65, 1.4 <n d8 <1.65, 1.7 <n d9 <1.9, 1.5 <n d10 <1.8; 20 <v d1 <30, 40 <v d2 <60,15 <v d3 <35, 50 <v d4 <75,30 <v d5 <50, 15 <v d6 <35, 60 <v d7 <80,50 <v d8 <75,15 <v d9 <35, 50 <v d10 <75; Among them, n d1 ~ n d10 are the refractive indices of the first lens L1 to the tenth lens L10, v d1 ~ v d10 are the Abbe numbers of the first lens L1 to the tenth lens L10, respectively.

[0030] In one embodiment, an aperture stop ST is further provided between the sixth lens L6 and the seventh lens L7 to facilitate adjustment of light flux.

[0031] In one embodiment, the high-resolution fisheye lens further satisfies the following conditions: 0.4 < SL / TTL < 0.47, 0.13 < Bfl / TTL < 0.2, 4° < φ < 10°; Where, SL is the distance from the aperture stop ST to the image plane, in mm, Bfl is the back focal length, in mm, TTL is the total optical length, in mm, and φ is the principal ray incident angle.

[0032] Where, when the high-resolution fisheye lens satisfies 0.4 < SL / TTL < 0.47, it can avoid the aperture stop ST being too close to the image plane, prevent the edge ray incident angle from getting out of control, and also avoid the aperture stop ST being too far forward, which helps to ensure a large light passing aperture at a small F number and meet the resolution requirements. And the forward movement of the aperture stop ST can suppress barrel distortion. Satisfying 0.13 < Bfl / TTL < 0.2 reserves enough back focal space to avoid the sensor of the image plane IMA from colliding with the tenth lens, which ensures that the back focal length needs to adapt to the physical thickness and packaging space of a large target surface sensor (such as 1 / 1.8"), and at the same time prevents back focal redundancy and maintains the miniaturization target of TTL < 30mm. Satisfying 4° < φ < 10°, too large incident angle will cause the edge rays to be blocked by the mechanical structure (vignetting). Controlling φ < 10° can increase the edge illumination, and controlling φ > 4° can avoid the central field of view rays from being too perpendicular, balancing field curvature and distortion. The synergistic effect of these conditions provides a quantitative design benchmark for the high-resolution fisheye lens among ultra-wide angle, miniaturization and high environmental adaptability.

[0033] In one embodiment, the field of view FOV of the high-resolution fisheye lens is greater than or equal to 195°, the F number is 2.0 - 2.1, and the total optical length TTL is less than or equal to 30mm.

[0034] In one embodiment, the working wavelength band of the high-resolution fisheye lens is visible light 435nm - 656nm and infrared light 830nm - 870nm. It satisfies confocal under visible light and infrared light and does not require refocusing.

[0035] The following is a detailed description through specific embodiments. Specifically, the aspheric equation of the tenth lens L10 satisfies the following expression: In the formula, Z is the sag height, c is the curvature, y is the radial coordinate, k is the conic quadratic coefficient, A i is the high-order term coefficient.

[0036] Such as Figure 1As shown, the leftmost curve only represents a virtual surface and not a specific structure. A filter IR and a protective glass CG are further provided between the tenth lens L10 and the image plane IMA. The two can be arranged in any order. In this embodiment, the filter IR is provided close to the image plane IMA, and the filter IR and the protective glass CG are made of the same material. Figure 3 The ordinate is the OTF modulus, and the abscissa is the spatial frequency (cycles / mm); Figure 4 The left picture is the field curvature map, and the right picture is the distortion map.

[0037] The optical parameters of each lens in this embodiment are shown in Table 1, and the aspheric coefficients are shown in Table 2. The aspheric coefficients include the conic quadratic curve coefficients k , high-order coefficients A i .

[0038] Table 1 Table 2 In Table 2, L10S1 and L10S2 are the object-side surface and image-side surface of the tenth lens L10, respectively.

[0039] According to the above data, if Figure 3-Figure 5 As shown, this high-resolution fisheye lens in this embodiment utilizes nine glass spherical lenses and one glass aspherical lens, achieving a significant performance boost through its innovative "positive distortion control" architecture. This all-glass lens combination and precise focal ratio control minimizes the total optical length to less than 30mm while maintaining an ultra-wide field of view exceeding 195°, significantly improving spatial adaptability. The cemented group of the third and fourth lens elements L3 and L4, the fifth and sixth lens elements L5 and L6, and the eighth and ninth lens elements L8 and L9 alternately offset spherical aberration and coma through positive and negative power, achieving a full-field visible light MTF of 323 lp / mm, meeting the requirements of high-definition 1.55μm pixel resolution. The refractive index differences in the cemented group offset lateral chromatic aberration, keeping edge purple fringing to less than 5 pixels and ensuring accurate color reproduction. The sixth and seventh lens elements L6 and L7 utilize biconvex lenses to reduce the spot diameter, enabling wide aperture, low-light scenes with an F-number of 2.0 to 2.1. The aperture stop (ST) and back focus ratio are synergistically optimized, compressing the overall length while adapting to sensors as large as 1 / 1.8", providing a lightweight solution for surveillance, drones, and in-vehicle surround view applications. This high-resolution fisheye lens features 90% spherical glass, with only the tenth lens element, L10, being aspherical. This significantly reduces manufacturing costs compared to all-aspherical solutions. The lens utilizes a combination of low-dispersion glass and a thermally compensated bonding process to achieve confocality across the visible and infrared spectrums, with an MTF degradation of <10% at high temperatures, enabling clear imaging across the full temperature range of -40°C to +70°C.

[0040] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0041] The above-described embodiments merely represent specific and detailed examples of the present application and should not be construed as limiting the scope of the patent application. It should be noted that a person skilled in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A high-resolution fisheye lens, characterized by: The high-resolution fisheye lens includes a first lens (L1), a second lens (L2), a third lens (L3), a fourth lens (L4), a fifth lens (L5), a sixth lens (L6), a seventh lens (L7), an eighth lens (L8), a ninth lens (L9) and a tenth lens (L10), which are arranged in sequence from the object side to the image side and meet the following conditions: 1.2≤f≤1.6, 1.15<|f1 / f2|<1.85, 0.8<|f2 / f3|<1.55, 0.75<|f5 / f6|<1.55,0.56<|f9 / f 10 |<1.35; Wherein, f is the effective focal length of the high-resolution fisheye lens, f1, f2, f3, f5, f6, f9, f 10 These are the focal lengths of the first lens (L1), the second lens (L2), the third lens (L3), the fifth lens (L5), the sixth lens (L6), the ninth lens (L9) and the tenth lens (L10), all in mm.

2. The high-resolution fisheye lens according to claim 1, wherein: The high-resolution fisheye lens also meets the following conditions: -18.5 <f1<-11.2,-12.5<f2<-8.1,6.7<f3<10.5,-4.5<f4<-2.2,-6.3<f5<-3.2, 2.7<f6<6.1,4.2<f7<8.5,5.1<f8<7.9,-7.6<f9<-2.4,3.5<f 10 <8.9; Among them, f4, f7, and f8 are the focal lengths of the fourth lens (L4), the seventh lens (L7), and the eighth lens (L8), respectively, and the unit is mm.

3. The high-resolution fisheye lens according to claim 1, wherein: The object side surface curvature radius of the first lens (L1), the second lens (L2), the third lens (L3), the fourth lens (L4), the fifth lens (L5), the sixth lens (L6), the seventh lens (L7), the eighth lens (L8), the ninth lens (L9) and the tenth lens (L10) is 11.5 respectively. <R 11 <23.6, 13.1 <R 21 <27.1, 13.3 <R 31 <20.7, -18.2 <R 41 <-9.1, -100 <R 51 <200, 2.1 <R 61 <10.7, 3.7 <R 71 <50.5, -25.7 <R 81 <-2.2, -12.6 <R 91 <2, -5 <R 101 <30.5, the image side curvature radius corresponds to 2.3 <R 12 <12.8, 2.1 <R 22 <10.9, -30 <R 32 <-3,0 <R 42 <9.6, 2.1 <R 52 <10.7, -30.5 <R 62 <-6.2, -11.5 <R 72 <-2.1, -10 <R 82 <0, -23.2 <R 92 <-2, -11.1 <R 102 <-2.1, unit: mm.

4. The high-resolution fisheye lens according to claim 1, wherein: The third lens (L3) and the fourth lens (L4) form a first cemented lens group, the fifth lens (L5) and the sixth lens (L6) form a second cemented lens group, and the eighth lens (L8) and the ninth lens (L9) form a third cemented lens group.

5. The high-resolution fisheye lens according to claim 1, wherein: The first lens (L1) and the second lens (L2) are both convex-concave glass spherical lenses, the third lens (L3), the sixth lens (L6) and the seventh lens (L7) are all biconvex glass spherical lenses, the fourth lens (L4) is a biconcave glass spherical lens, the fifth lens (L5) is a plano-concave glass spherical lens or a convex-concave glass spherical lens, the eighth lens (L8) and the ninth lens (L9) are both concave-convex glass spherical lenses, and the tenth lens (L10) is a biconvex glass aspherical lens.

6. The high-resolution fisheye lens according to claim 1, wherein: The high-resolution fisheye lens also meets the following conditions: 1.8<n d1 <2.01,1.5<n d2 <1.7,1.7<n d3 <1.9,1.4<n d4 <1.65,1.7<n d5 <1.9, 1.7<n d6 <1.9,1.4<n d7 <1.65,1.4<n d8 <1.65,1.7<n d9 <1.9,1.5<n d10 <1.8; 20<v d1 <30,40<v d2 <60,15<v d3 <35,50<v d4 <75,30<v d5 <50, 15<v d6 <35,60<v d7 <80,50<v d8 <75,15<v d9 <35,50<v d10 <75; Among them, n d1 ~ n d10 are the refractive indices of the first lens (L1) to the tenth lens (L10), v d1 ~ v d10 are the Abbe numbers of the first lens (L1) to the tenth lens (L10) in sequence.

7. The high-resolution fisheye lens according to claim 1, wherein: An aperture stop (ST) is further provided between the sixth lens (L6) and the seventh lens (L7).

8. The high-resolution fisheye lens according to claim 7, wherein: The high-resolution fisheye lens also meets the following conditions: 0.4 <SL / TTL<0.47,0.13<Bfl / TTL<0.2,4°<φ<10°; Wherein, SL is the distance from the aperture stop (ST) to the image plane, in mm, Bfl is the back focus, in mm, TTL is the total optical length, in mm, and φ is the principal ray incident angle.

9. The high-resolution fisheye lens according to claim 1, wherein: The high-resolution fisheye lens has a field of view (FOV) greater than or equal to 195°, an F number of 2.0-2.1, and a total optical length (TTL) less than or equal to 30 mm.

10. The high-resolution fisheye lens according to claim 1, wherein: The operating wavelength band of the high-resolution fisheye lens is 435nm~656nm for visible light and 830nm~870nm for infrared light.

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