A high-resolution fisheye lens

Abstract

The utility model discloses a kind of high-resolution fish eye lens, including first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, ninth lens and tenth lens arranged in order from object side to image side, and satisfy the following conditions: 1.4≤f≤1.5, 1.45<|f1 / f2|<1.78, 0.96<|f2 / f3|<1.23, 0.94<|f5 / f6|<1.35, 0.78<|f9 / f 10 |<1.0. By reasonably setting lens and focal length, the high-resolution fish eye lens meets the requirements of small size and light weight, large target surface, low total length, high pixel number at edge and large working distance under large field angle, and has low cost, which helps to reduce manufacturing difficulty and improve yield.

Description

Technical Field

[0001] This utility model belongs to the field of optical lens technology, specifically relating to a high-resolution fisheye lens. Background Technology

[0002] Fisheye lenses, as a type of ultra-wide-angle optical system, can capture scene information across a near-hemispherical space in a single frame, giving them an irreplaceable advantage in real-time panoramic imaging. These lenses mimic the water-view perspective of a fish's eye through biomimetic principles, achieving full-sky-gazing without mechanical scanning or multi-lens stitching. They are widely used in intelligent security, vehicle surround view, drone navigation, virtual reality, and other fields. Their core value lies in balancing a large field of view with real-time requirements. Especially in scenarios such as dynamic target tracking and environmental situational awareness, the wide-angle characteristics of fisheye lenses significantly improve 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 contradictions between size, distortion, and cost. While multi-lens stacking or aspherical designs can theoretically expand the field of view and suppress some aberrations, in practical applications, the excessive complexity of the optical system often leads to an enlarged size, making it difficult to meet the miniaturized requirements of drones and smart wearable devices. Simultaneously, the barrel distortion (F-THETA distortion) problem caused by the large field of view is particularly prominent. Traditional solutions typically exhibit negative distortion characteristics, resulting in severe edge image stretching, necessitating a sacrifice of resolution for geometric accuracy during post-processing correction. Even more challenging is the fact that many designs rely on high-cost aspherical lenses or special coating processes to balance aberrations, further increasing manufacturing costs. Furthermore, in terms of environmental adaptability, insufficient thermal stability over a wide temperature range and difficulties in confocalization in the visible and infrared bands also limit their application potential in scenarios such as automotive monitoring and industrial inspection. Furthermore, with the iteration of image sensor technology, chips with a large target surface of 1 / 1.8 inches and a tiny pixel size of 1.55μm place higher demands on the resolution of the lens. Traditional designs often suffer from insufficient pixel density at the edge of the field of view, resulting in loss of detail and making it difficult to meet the requirements of high-definition imaging. Utility Model Content

[0004] To address the aforementioned issues, this invention proposes a high-resolution fisheye lens that meets the requirements of small size and lightweight design, large target surface, low overall length, high pixel count at the edges, and large working distance under a wide field of view. It is also low in cost, which helps to reduce manufacturing difficulty and improve yield.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] This utility model proposes 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 arranged sequentially from the object side to the image side, and satisfying the following conditions:

[0007] 1.2≤f≤1.6, 1.15<|f1 / f2|<1.85, 0.8<|f2 / f3|<1.55,

[0008] 0.75<|f5 / f6|<1.55, 0.56<|f9 / f 10 |<1.35;

[0009] Where f is the effective focal length of the high-resolution fisheye lens, f1, f2, f3, f5, f6, f9, f 10 The focal lengths of the first, second, third, fifth, sixth, ninth, and tenth lenses, respectively, are in mm.

[0010] Preferably, the high-resolution fisheye lens also meets the following conditions:

[0011] -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,

[0012] 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;

[0013] Where f4, f7, and f8 are the focal lengths of the fourth, seventh, and eighth lenses, respectively, in mm.

[0014] Preferably, the object-side surface radii of curvature of the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, ninth lens, and tenth lens are respectively 11.5. <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 corresponding side curvature radius is 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.

[0015] 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.

[0016] Preferably, the first and second lenses are both convex-concave glass spherical lenses, the third, sixth and seventh lenses 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 and ninth lenses are both concave-convex glass spherical lenses, and the tenth lens is a biconvex glass aspherical lens.

[0017] Preferably, the high-resolution fisheye lens also meets the following conditions:

[0018] 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,

[0019] 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;

[0020] 20 <v d1 <30, 40 <v d2 <60, 15 <v d3 <35, 50 <v d4 <75, 30 <v d5 <50,

[0021] 15 <v d6<35, 60 <v d7 <80, 50 <v d8 <75, 15 <v d9 <35, 50 <v d10 <75;

[0022] Where, n d1 ~ n d10 The refractive indices of the first to tenth lenses are, in order, v. d1 ~ v d10 The Abbe numbers are listed in order from the first lens to the tenth lens.

[0023] Preferably, an aperture stop is provided between the sixth lens and the seventh lens.

[0024] Preferably, the high-resolution fisheye lens also meets the following conditions:

[0025] 0.4 <SL / TTL<0.47,0.13<Bfl / TTL<0.2,4°<φ<10°;

[0026] Where SL is the distance from the aperture stop 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 angle of incidence of the principal ray.

[0027] Preferably, the high-resolution fisheye lens has a field of view (FOV) greater than or equal to 195°, an F-number of 2.0 to 2.1, and a total optical length (TTL) less than or equal to 30 mm.

[0028] Preferably, the working wavelength of the high-resolution fisheye lens is 435nm~656nm in visible light and 830nm~870nm in infrared light.

[0029] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0030] 1) Ultra-wide-angle and high pixel density design: Through the innovative architecture of "positive distortion control", nine glass spherical lenses and one glass aspherical lens are used for collaborative correction and the focal length ratio is reasonably set. While ensuring a field of view of ≥195°, the total optical length is compressed to less than 30mm, which significantly improves spatial adaptability. Compared with the negative distortion characteristics of existing technologies, the F-THETA distortion is controlled at +15%~+20%. By moving the aperture stop forward and modulating the optical path with the rear negative lens, the incident angle of the main ray is changed by optimizing the position of the aperture stop. The rear negative lens modulates the edge light rays a second time, turning the originally outward diffused light path into an inward convergence, actively compressing the edge field of view light rays towards the center, thereby forming a higher density pixel distribution at the sensor edge of the image plane, increasing the pixel density per unit field of view at the edge to 23 (the traditional solution is ≤18, an increase of nearly 30%), which is beneficial for the subsequent algorithm to correct distortion. This positive distortion strategy also significantly improves edge resolution, enabling the lens to achieve a maximum 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-area sensors (1 / 1.8") and the large working distance requirements for imaging from 500mm to infinity. It provides an optical solution with high resolution, low distortion, and strong environmental robustness for scenarios such as intelligent security and autonomous driving surround view systems.

[0031] 2) Compact structure and high environmental stability: The aperture stop position (SL / TTL=0.4~0.47), back focal ratio (Bf / TTL=0.13~0.2), and principal ray incident angle (φ<10°) are optimized to achieve a large aperture of F number 2.0~2.1 under the constraint of total optical length ≤30mm. Low dispersion glass and thermal compensation bonding technology are used to ensure confocal stability under extreme temperatures in a wide temperature range of -40℃~+70℃. The MTF curve offset of visible light band (435~656nm) and infrared light band (830~870nm) is controlled within 5%, realizing seamless switching between day and night imaging.

[0032] 3) Low-cost and high-yield manufacturing: The front optical group (lenses 1 to 6) uses all-glass spherical lenses with decreasing aperture, while the rear optical group uses a glass aspherical lens (tenth lens) to handle the principal optical power. Combined with an increasing aperture design (lenses 7 to 10), the tolerance sensitivity is reduced while controlling the size of the rear optical group. Standardized processing of all-glass spherical lenses and minimizing the proportion of glass aspherical lenses (retaining 90% spherical lens proportion, with only one aspherical lens) not only leverages the advantages of aspherical lenses in accurately correcting higher-order aberrations, but also reduces manufacturing costs by 40% and increases yield by 20% compared to an all-aspherical solution, making it suitable for large-scale mass production needs in the consumer market. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of the high-resolution fisheye lens of this utility model;

[0034] Figure 2 This is the optical path diagram of the high-resolution fisheye lens of this utility model;

[0035] Figure 3 This is a visible spectrum MTF diagram of an embodiment of the present invention;

[0036] Figure 4 This is the infrared MTF spectrum of an embodiment of the present invention;

[0037] Figure 5 This is a field curvature and distortion diagram of an embodiment of the present invention.

[0038] 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, protective glass; IMA, image plane. Detailed Implementation

[0039] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0040] It should be noted that, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application.

[0041] like Figures 1-5 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 arranged sequentially from the object side to the image side, and satisfies the following conditions:

[0042] 1.2≤f≤1.6, 1.15<|f1 / f2|<1.85, 0.8<|f2 / f3|<1.55,

[0043] 0.75<|f5 / f6|<1.55, 0.56<|f9 / f 10 |<1.35;

[0044] Where f is the effective focal length of the high-resolution fisheye lens, f1, f2, f3, f5, f6, f9, f 10 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 are, in mm.

[0045] This high-resolution fisheye lens comprises ten lenses. When 1.15 < |f1 / f2| < 1.85, it prevents excessive divergence of the second lens L2, which could lead to insufficient field of view, and avoids insufficient divergence of the first lens L1, thus reducing the pressure on subsequent aberration correction. Both the first lens L1 and the second lens L2 are negative power lenses; this ratio limits the matching of their divergence intensity, balancing the divergence of the first group and providing a basis for the forward movement of the subsequent aperture stop ST to suppress barrel distortion. When 0.8 < |f2 / f3| < 1.55, the focal length ratio of the second lens L2 (e.g., negative power) and the third lens L3 (e.g., positive power) controls the smooth transition of the light path from divergence to convergence. The opposite directions of the optical power of the second lens L2 and the third lens L3 allow for synergistic correction of coma, limiting the convergence intensity of the third lens L3 and preventing excessive accumulation of spherical aberration. Through ratio optimization, it reduces focal shift across a wide spectrum (435~870nm) and improves confocal stability day and night. To ensure sufficient negative optical power (0.75 < |f5 / f6| < 1.55) to compensate for edge field astigmatism, and to prevent excessive convergence of the sixth lens (L6) leading to field curvature reversal, the fifth lens (L5) and the sixth lens (L6) are preferably bonded together as a second cemented unit. This ratio allows adjustment of their compensation effect on field curvature. To further ensure sufficient negative optical power (0.75 < |f5 / f6| < 1.55), the negative optical power of the fifth lens (L5) and the positive optical power of the sixth lens (L6) are preferably bonded together. 10 With a value of <1.35, through proportional optimization and combined with correction of the tenth lens L10 (preferably aspherical), the number of pixels per unit field of view at the edge can be increased, while the positive optical power intensity of the tenth lens L10 can be limited to prevent excessive convergence of edge rays from causing uncontrolled positive distortion. This ensures that the optical power directions of the ninth lens L9 and the tenth lens L10 are opposite, thus synergistically compressing the optical path and reducing the total optical length.

[0046] In one embodiment, the high-resolution fisheye lens also satisfies the following condition:

[0047] -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,

[0048] 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;

[0049] Where f4, f7, and f8 are the focal lengths of the fourth lens L4, the seventh lens L7, and the eighth lens L8, respectively, in mm.

[0050] The first lens, L1, serves as the initial incident lens. Its negative optical power allows for rapid light divergence, expanding the field of view to nearly 180°. Simultaneously, it reduces the incident height of edge rays, minimizing aberration burden on subsequent lenses. This divergence design provides space for subsequent positive distortion control, preventing premature convergence of edge rays and the accumulation of negative distortion. The second lens, L2, continues the diverging effect of L1, further expanding the field of view. Its well-designed surface profile ensures smooth light transitions, preventing abrupt refraction that could cause astigmatism. Together with L1, it forms a negative optical power dual-lens group, maintaining confocal stability across a wide spectrum and reducing focal shift in the infrared band. The two negative lenses work together to reduce the incident angle of edge rays, providing a basis for moving the aperture stop ST position forward (between the sixth lens L6 and the seventh lens L7), thus improving light transmission uniformity. The third lens L3 uses positive optical power to initially converge the diverging rays from the first two negative lenses, raising the height of the principal ray and balancing the optical path difference between the center and edge of the field of view. Its converging function, in conjunction with the subsequent aperture stop ST, limits the ray tilt angle (φ<10°), suppressing barrel distortion. The converged rays here reduce the beam diameter and also increase illumination. The fourth lens L4 uses negative optical power to further diverge the converged rays from the third lens L3, correcting residual spherical aberration and field curvature from the previous group. It is cemented with the third lens L3 to form the first cemented group, utilizing the difference in refractive index between high / low dispersion glass to offset axial chromatic aberration and compress lateral chromatic aberration (purple fringing). The diverging light path compresses the overall optical length, making it suitable for miniaturization requirements up to 30mm. The fifth lens L5 uses negative optical power to further diverge light, suppressing field curvature at the edges of the field of view. Its optimized surface profile reduces assembly sensitivity and improves yield. It is bonded to the sixth lens L6 to form a second bonding assembly. The bonding interface uses a heat-stable adhesive to ensure no cracking of the bonding layer at temperatures ranging from -40℃ to +70℃, maintaining MTF stability in the infrared band. The sixth lens L6 uses positive optical power to strongly converge the divergent light from the fifth lens L5, improving central field-of-view resolution and providing an ideal incident cone for the aperture stop ST. Bonding with the fifth lens L5 cancels chromatic aberration, achieving a spatial frequency limit of 323 lp / mm, suitable for 1.55μm pixels. The forward shift of the aperture stop ST, combined with the converging effect of the sixth lens L6, actively introduces positive distortion (+15%~+20%), increasing the edge pixel density to 23 pixels / degree. The seventh lens, L7, continues to converge light with positive optical power, compressing the beam diameter and reducing the deflection amplitude of edge light. The symmetrical surface design of the sixth lens, L6, and the seventh lens, L7, reduces manufacturing difficulty and significantly lowers tolerance sensitivity compared to aspherical solutions. It also works in conjunction with the sixth lens, L6, to reduce the spot size, improve edge illumination, and prevent vignetting. The eighth lens, L8, gently deflects light, corrects coma, and balances the optical path symmetry. It is cemented with the ninth lens, L9, to form the third cemented lens assembly. By combining negative and positive optical power to compress the edge optical path, it maintains a positive distortion distribution. Simultaneously, the matching thermal expansion coefficients of the cemented lens materials ensure that the focal shift is <5μm at high temperatures.The ninth lens L9 uses negative optical power to moderately diverge the light from the eighth lens L8, suppressing edge astigmatism. It is cemented with the eighth lens L8 to cancel lateral chromatic aberration, reducing chromatic aberration in the visible and infrared bands. The negative optical power compresses the aperture, making it suitable for large target area sensors (1 / 1.8"), and complements the optical power of the tenth lens L10. The tenth lens L10 (preferably aspherical) can precisely control the light convergence angle, smoothly projecting edge light onto the image plane, canceling spherical aberration and correcting residual distortion.

[0051] In one embodiment, the object-side surface radii of curvature of the first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, eighth lens L8, ninth lens L9, and tenth lens L10 are respectively 11.5. <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 corresponding side curvature radius is 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 mm. Clear imaging is possible at operating temperatures ranging from -40℃ to +70℃.

[0052] 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 alternately canceling spherical aberration and coma through positive and negative optical power.

[0053] 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 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 uses only a single aspherical lens, which improves edge resolution while reducing overall cost.

[0054] In one embodiment, the high-resolution fisheye lens also satisfies the following condition:

[0055] 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,

[0056] 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;

[0057] 20 <v d1 <30, 40 <v d2 <60, 15 <v d3 <35, 50 <v d4 <75, 30 <v d5 <50,

[0058] 15 <v d6 <35, 60 <v d7 <80, 50 <v d8 <75, 15 <v d9 <35, 50 <v d10 <75;

[0059] Where, n d1 ~ n d10 The refractive indices of lenses L1 through L10 are, in order, v. d1 ~ v d10 The Abbe numbers are, in order, those of the first lens L1 to the tenth lens L10.

[0060] In one embodiment, an aperture stop ST is also provided between the sixth lens L6 and the seventh lens L7 to facilitate adjustment of the light flux.

[0061] In one embodiment, the high-resolution fisheye lens also meets the following conditions:

[0062] 0.4 < SL / TTL < 0.47, 0.13 < Bfl / TTL < 0.2, 4° < φ < 10°;

[0063] 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 incidence angle.

[0064] Among them, when the high-resolution fisheye lens satisfies 0.4 < SL / TTL < 0.47, it can prevent the aperture stop ST from being too close to the image plane, prevent the edge ray incidence angle from getting out of control, and also prevent the aperture stop ST from being too far forward, which helps to ensure a large light passing aperture at a small F number and meet the resolution requirements. Moreover, the forward movement of the aperture stop ST can suppress barrel distortion. When 0.13 < Bfl / TTL < 0.2, sufficient back focal space is reserved to avoid the sensor of the image plane IMA from colliding with the tenth lens. This 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 goal of TTL < 30 mm. When 4° < φ < 10°, too large incidence angle will cause the edge rays to be blocked by the mechanical structure (vignetting). Controlling φ < 10° can improve the edge illumination, and controlling φ > 4° can avoid the center field rays from being too perpendicular, balancing the 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.

[0065] 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 30 mm.

[0066] In one embodiment, the working wavelength band of the high-resolution fisheye lens is visible light 435 nm - 656 nm and infrared light 830 nm - 870 nm. It meets the confocal condition under visible light and infrared light, and there is no need for refocusing.

[0067] The following is a detailed description through specific embodiments. Specifically, the aspheric equation of the tenth lens L10 satisfies the following expression:

[0068]

[0069] 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.

[0070] like Figure 1 As shown, the leftmost curve represents only a virtual surface and not a specific structure. A filter IR and a protective glass CG are 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 set close to the image plane IMA, and the filter IR and the protective glass CG are made of the same material. Figure 3 The vertical axis represents the OTF magnitude, and the horizontal axis represents the spatial frequency (period / mm). Figure 4 The left image is the field curvature diagram, and the right image is the distortion diagram.

[0071] The optical parameters of each lens in this embodiment are shown in Table 1, and the aspherical coefficients are shown in Table 2. The aspherical coefficients include the conic conic coefficients. k coefficients of higher-order terms A i .

[0072] Table 1

[0073]

[0074] Table 2

[0075]

[0076] In Table 2, L10S1 and L10S2 are the object-side surface and image-side surface of the tenth lens L10, respectively.

[0077] Based on the above data, such as Figures 3-5As shown, in this embodiment, the high-resolution fisheye lens employs nine spherical glass lenses and one aspherical glass lens, achieving a performance leap through an innovative "positive distortion control" architecture. Based on the all-glass lens combination and precise focal length ratio control, while ensuring an ultra-wide field of view of over 195°, the total optical length is compressed to within 30mm, significantly improving spatial adaptability. The cemented group of the third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, eighth lens L8, and ninth lens L9 alternates between positive and negative optical power to cancel spherical aberration and coma, achieving a full-field visible light MTF resolution of @323 lp / mm, meeting the high-definition requirements of 1.55μm pixels. The refractive index difference of the cemented group cancels lateral chromatic aberration, controlling edge purple fringing to <5 pixels, ensuring accurate color reproduction. The sixth lens L6 and the seventh lens L7 employ biconvex lenses to compress the spot diameter, supporting large aperture low-light scenes with F-numbers of 2.0~2.1. The aperture stop ST and back focal length are optimized in synergy, compressing the overall length while adapting to 1 / 1.8” large target surface sensors, providing a lightweight solution for surveillance, drones, and vehicle surround view. This high-resolution fisheye lens has a 90% glass spherical surface area, with only the tenth lens L10 using an aspherical surface, significantly reducing manufacturing costs compared to all-aspherical solutions. It employs a combination of low-dispersion glass and a thermally compensated bonding process to achieve confocal imaging in both the visible and infrared spectra, with MTF high-temperature attenuation of <10%, achieving clear imaging across the entire temperature range of -40℃ to +70℃.

[0078] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0079] The embodiments described above are merely specific and detailed examples of the embodiments described in this application, and should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the scope of protection of this patent application should be determined by the appended claims.

Claims

1. A high-resolution fisheye lens, characterized in that: The high-resolution fisheye lens comprises 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), arranged sequentially from the object side to the image side, and satisfies 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; Where f is the effective focal length of the high-resolution fisheye lens, f1, f2, f3, f5, f6, f9, f 10 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) are, respectively, all in mm.

2. The high-resolution fisheye lens as described in claim 1, characterized in that: 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; Wherein, f4, f7, and f8 are the focal lengths of the fourth lens (L4), the seventh lens (L7), and the eighth lens (L8), respectively, in mm.

3. The high-resolution fisheye lens as described in claim 1, characterized in that: The object-side surface radii of curvature of the first lens (L1), second lens (L2), third lens (L3), fourth lens (L4), fifth lens (L5), sixth lens (L6), seventh lens (L7), eighth lens (L8), ninth lens (L9), and tenth lens (L10) are respectively 11.

5. <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 corresponding side curvature radius is 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 as described in claim 1, characterized in that: 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 as described in claim 1, characterized in that: 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 as described in claim 1, characterized in that: 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; Where, n d1 ~ n d10 The refractive indices of the first lens (L1) to the tenth lens (L10) are, in order, v d1 ~ v d10 The Abbe numbers are, in order, the first lens (L1) to the tenth lens (L10).

7. The high-resolution fisheye lens as described in claim 1, characterized in that: An aperture stop (ST) is also provided between the sixth lens (L6) and the seventh lens (L7).

8. The high-resolution fisheye lens as described in claim 7, characterized in that: 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 focal length in mm, TTL is the total optical length in mm, and φ is the principal ray incident angle.

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

10. The high-resolution fisheye lens as described in claim 1, characterized in that: The high-resolution fisheye lens operates in the visible light range of 435nm to 656nm and the infrared range of 830nm to 870nm.

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