A micro-light all-glass fisheye lens

Abstract

The present application relates to the field of optical lens technology field, and relates to a kind of micro-light full glass fisheye lens;The compact micro-light full glass fisheye lens, 9 spherical glass is used, the aberration of system is corrected to the maximum, so that its performance is excellent, the structure between each lens is compact, reduces the use of spacer component, with small size, light weight, low cost and other characteristics, with higher performance-price ratio, can realize small size, light weight, good performance and low cost characteristics, and the present application is selected by reasonable lens material, power distribution and optical design optimization, realizes 24 hours all-weather high-definition monitoring, day and night imaging confocal, real shot picture is clear.

Description

Technical Field

[0001] This invention relates to the technical field of optical lenses, specifically to a low-light all-glass fisheye lens. Background Technology

[0002] A fisheye lens is an ultra-wide-angle lens characterized by its short focal length and large field of view. In engineering design, technicians generally refer to lenses with a field of view greater than 140° as fisheye lenses. In practical applications, there are not only fisheye lenses with a field of view of 180°, but also those with a field of view exceeding 180° and even reaching 270°. In recent years, fisheye lenses have been widely used in fields such as automotive driver assistance, surveillance, engineering surveying, and photography.

[0003] Fisheye lenses typically consist of a front group and a rear group. The front group is a negative power lens, and the rear group is a positive power lens. After light passes through the front group lens, the angle between the light ray and the optical axis becomes smaller. The rear group lens mainly corrects the aberrations of the system.

[0004] When fisheye lenses are used in automotive driver assistance systems, they need to be able to capture images in low-light conditions (0.001 lux) with no artificial light or moonlight. At night, the brightness of clear starlight is only one percent of that of moonlight. In addition to visible light, the night sky's radiation spectrum includes a significant amount of near-infrared radiation, and this near-infrared radiation increases dramatically in a moonless, starlit sky, sometimes even exceeding visible light radiation. Currently, most fisheye lenses are only suitable for the visible light range and do not include the near-infrared region. Therefore, they lose energy information when capturing images under starlight at night. Furthermore, their relatively small aperture results in insufficient illumination reaching the image plane, failing to meet the needs of low-light shooting at night. The image height is also small, making them incompatible with domestically produced low-light cameras with 1-inch or 2-inch sensor sizes. Summary of the Invention

[0005] The purpose of this invention is to provide a compact, low-light, full-wavelength fisheye lens, employing nine spherical glass elements. All lens materials are domestically produced and manufactured using conventional processes, resulting in low cost. The lens provides high-definition image quality even with a wide field of view.

[0006] It can achieve 24-hour all-weather high-definition monitoring.

[0007] To solve the above-mentioned technical problems, the present invention is implemented using the following technical solution, which is described below in conjunction with the accompanying drawings:

[0008] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0009] A low-light full-wave fisheye lens defines the surface of the lens adjacent to the object plane as the object-side surface and the surface of the lens adjacent to the image plane as the image-side surface, arranged sequentially from the object-side surface to the image-side surface along the lens optical axis:

[0010] The first lens is a spherical lens with negative optical power, wherein the object side of the first lens is convex and the image side is concave.

[0011] The second lens is a spherical lens with negative optical power, and the object side and the image side of the second lens are concave.

[0012] The third lens is a spherical lens with positive optical power, and the object side and the image side of the third lens are convex.

[0013] The fourth lens is a spherical lens with negative optical power. The object side and the image side of the fourth lens are concave. The third lens and the fourth lens are cemented lenses formed by cementing.

[0014] The fifth lens is a spherical lens with positive optical power, wherein the object side and the image side are both convex.

[0015] The sixth lens is a spherical lens with negative optical power, wherein the object side of the sixth lens is convex and the image side is concave.

[0016] The seventh lens is a spherical lens with positive optical power. The object side and the image side of the seventh lens are convex. The sixth lens and the seventh lens are cemented lenses formed by cementing.

[0017] The eighth lens is a spherical lens with positive optical power, wherein the object side and the image side of the eighth lens are convex.

[0018] The ninth lens is a spherical lens with negative optical power. The object side of the ninth lens is concave, and the image side is convex. The eighth and ninth lenses are cemented lenses formed by cementing.

[0019] Furthermore, the lens also includes an image acquisition element disposed on the image side of the protective glass.

[0020] Furthermore, the lens also includes an aperture stop located between the seventh lens and the eighth lens.

[0021] Furthermore, the lens satisfies the following condition:

[0022] -22.9≤f1 / f≤-24.6,

[0023] -6.88≤f² / f≤-9.24

[0024] -6.23≤f³ / f≤-8.36

[0025] 15.29≤f4 / f≤18.96

[0026] 7.51≤f5 / f≤10.05

[0027] 5.74≤f6 / f≤8.43

[0028] Where: f is the total focal length of the lens, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the first cemented lens, f4 is the focal length of the fifth lens, f5 is the focal length of the second cemented lens, and f6 is the focal length of the third cemented lens.

[0029] Furthermore, the focal lengths of the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, ninth lens, first cemented lens, second cemented lens, and third cemented lens satisfy the following conditions:

[0030] First lens: -55.61 to -48.02; Second lens: -20.12 to -15.31; Third lens: 457.53 to 479.69; Fourth lens: -17.93 to -11.73; Fifth lens: 35.08 to 40.54; Sixth lens: 21.33 to 26.08; Seventh lens: -60.17 to -54.82; Eighth lens: 16.04 to 21.31; Ninth lens: 1609.85 to 1623.27;

[0031] First cemented lens: -13.58 to -18.22; Second cemented lens: 16.37 to 21.91; Third cemented lens: 12.51 to 18.38.

[0032] The above range of values ​​includes both endpoints.

[0033] Furthermore, the refractive indices of the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, and ninth lens satisfy the following condition:

[0034] ND1: 1.50~1.55; ND2: 1.55~1.60; ND3: 1.68~1.73; ND4: 1.53~1.59;

[0035] ND5: 1.67~1.74; ND6: 1.74~1.81; ND7: 1.53~1.60; ND8: 1.70~1.77; ND9: 1.81~1.88;

[0036] The above range of values ​​includes both endpoints.

[0037] Where: ND1 is the refractive index of the first lens;

[0038] ND2 is the refractive index of the second lens;

[0039] ND3 is the refractive index of the third lens;

[0040] ND4 is the refractive index of the fourth lens;

[0041] ND5 is the refractive index of the fifth lens;

[0042] ND6 is the refractive index of the sixth lens;

[0043] ND7 is the refractive index of the seventh lens;

[0044] ND8 is the refractive index of the eighth lens;

[0045] ND9 is the refractive index of the ninth lens;

[0046] Furthermore, the radii of curvature of the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, and ninth lens satisfy the following condition:

[0047] R11: 49.67~58.23; R12: 15.26~21.54;

[0048] R21: -130.58~-113.96; R22: 8.23~15.69;

[0049] R31: 410.36~496.25; R32: -301.69~-347.82;

[0050] R41: -298.24~-329.88; R42: 5.68~12.11;

[0051] R51: 63.23~73.56; R52: -47.69~-37.81;

[0052] R61: 8.55~14.29; R62: 3.95~10.84;

[0053] R71: 4.82~9.46; R72: -51.21~-39.43;

[0054] R81: 7.24~15.91; R82: -9.58~-1.16;

[0055] R91: -7.85~-2.11; R92: -49.19~-30.57;

[0056] The above range of values ​​includes both endpoints.

[0057] Where: R11 is the radius of curvature of the object side surface of the first lens, and R12 is the radius of curvature of the image side surface of the first lens;

[0058] R21 is the radius of curvature of the object side surface of the second lens, and R22 is the radius of curvature of the image side surface of the second lens.

[0059] R31 is the radius of curvature of the object side surface of the third lens, and R32 is the radius of curvature of the image side surface of the third lens.

[0060] R41 is the radius of curvature of the object side surface of the fourth lens, and R42 is the radius of curvature of the image side surface of the fourth lens.

[0061] R51 is the radius of curvature of the object side surface of the fifth lens, and R52 is the radius of curvature of the image side surface of the fifth lens.

[0062] R61 is the radius of curvature of the object side surface of the sixth lens, and R62 is the radius of curvature of the image side surface of the sixth lens.

[0063] R71 is the radius of curvature of the object side surface of the seventh lens, and R72 is the radius of curvature of the image side surface of the seventh lens.

[0064] R81 is the radius of curvature of the object side surface of the eighth lens, and R82 is the radius of curvature of the image side surface of the eighth lens.

[0065] R91 is the radius of curvature of the object side surface of the ninth lens, and R92 is the radius of curvature of the image side surface of the ninth lens.

[0066] Furthermore, the Abbe constants of the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, and ninth lens satisfy the following condition:

[0067] VD1: 60.32~70.95; VD2: 55.94~68.72; VD3: 25.23~35.41; VD4: 64.29~77.13; VD5: 23.4 8~36.97; VD6: 43.88~56.29; VD7: 50.34~61.62; VD8: 47.42~56.91; VD9: 18.36~28.11;

[0068] The above range of values ​​includes both endpoints.

[0069] Where VD1 is the Abbe constant of the first lens;

[0070] VD2 is the Abbe constant of the second lens;

[0071] VD3 is the Abbe constant of the third lens;

[0072] VD4 is the Abbe constant of the fourth lens;

[0073] VD5 is the Abbe constant of the fifth lens;

[0074] VD6 is the Abbe constant of the sixth lens;

[0075] VD7 is the Abbe constant of the seventh lens;

[0076] VD8 is the Abbe constant of the eighth lens;

[0077] VD9 is the Abbe constant of the ninth lens.

[0078] Preferably, the focal length of the first lens is -51.9, the focal length of the second lens is -17.4, the focal length of the third lens is -15.29, the focal length of the fifth lens is 38.02, the focal length of the second cemented lens is 19.31, and the focal length of the third cemented lens is 14.1.

[0079] ND1 is 1.53, ND2 is 1.56, ND3 is 1.69, ND4 is 1.58, ND5 is 1.68, ND6 is 1.75, ND7 is 1.55, ND8 is 1.71, and ND9 is 1.82.

[0080] The values ​​of VD1 are 63.22, VD2 are 60.25, VD3 are 28.51, VD4 are 65.91, VD5 are 30.5, VD6 are 48.6, VD7 are 52.21, VD8 are 50.49, and VD9 are 20.08.

[0081] The first lens has a first surface radius of curvature of 57.93 and a second surface radius of curvature of 15.48; the second lens has a first surface radius of curvature of -119.56 and a second surface radius of curvature of 12.98; the first cemented lens has a first surface radius of curvature of 429.81 and a second surface radius of curvature of 10.05; the fifth lens has a first surface radius of curvature of 68.45 and a second surface radius of curvature of -41.95; the second cemented lens has a first surface radius of curvature of 11.89 and a second surface radius of curvature of -42.31; the third cemented lens has a first surface radius of curvature of 10.17 and a second surface radius of curvature of -38.27.

[0082] The center thickness of L1 is 4, the center thickness of L2 is 2, the center thickness of L3 is 5.5, the center thickness of L4 is 3.5, the center thickness of L5 is 6, and the center thickness of L6 is 5. The air gap between L1 and L2 is 17, the air gap between L2 and L3 is 4, the air gap between L3 and L4 is 11.8, the air gap between L4 and L5 is 3, the air gap between L5 and L6 is 3, and the air gap between L6 and the image plane is 8.

[0083] An electronic device includes the low-light full-wave fisheye lens and an imaging element for converting the optical image formed by the low-light full-wave fisheye lens into an electrical signal.

[0084] Compared with the prior art, the beneficial effects of the present invention are:

[0085] This compact, low-light, all-glass fisheye lens uses nine spherical glass elements to correct system aberrations to the greatest extent, resulting in excellent performance. The compact structure between the lenses reduces the use of spacers, making it small, lightweight, and low-cost, offering high cost-effectiveness. It achieves the characteristics of small size, light weight, good performance, and low cost. Moreover, through reasonable lens material selection, optical power distribution, and optical design optimization, this invention enables 24-hour all-weather high-definition monitoring, day and night confocal imaging, and clear images. Attached Figure Description

[0086] The invention will now be further described with reference to the accompanying drawings:

[0087] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0088] Figure 2 This is a transfer function diagram of Embodiment 1 of the present invention;

[0089] Figure 3 The field curvature and distortion curves of Embodiment 1 of the present invention;

[0090] Figure 4 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0091] Figure 5 This is a transfer function diagram of Embodiment 2 of the present invention;

[0092] Figure 6 The field curvature and distortion curves of Embodiment 2 of the present invention;

[0093] Figure 7 This is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0094] Figure 8 This is a transfer function diagram of Embodiment 3 of the present invention;

[0095] Figure 9 The field curvature and distortion curves are from Embodiment 3 of the present invention. Detailed Implementation

[0096] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the embodiments of this invention will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this invention. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this invention, and should not be construed as limiting the invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention. The embodiments of this invention will be described in detail below with reference to the accompanying drawings.

[0097] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0098] The present invention will now be described in detail with reference to the accompanying drawings:

[0099] The purpose of this invention is to provide a compact, low-light, full-wavelength fisheye lens, employing nine spherical glass elements. All lens materials are domestically produced and manufactured using conventional processes, resulting in low cost. The lens provides high-definition image quality even with a wide field of view.

[0100] It can achieve 24-hour all-weather high-definition monitoring.

[0101] The objective of this invention is achieved through the following technical solution:

[0102] A compact low-light full-wave fisheye lens defines the surface of the lens adjacent to the object plane as the object-side surface and the surface of the lens adjacent to the image plane as the image-side surface, arranged sequentially from the object-side to the image-side along the lens optical axis:

[0103] The first lens is a spherical lens with negative optical power, wherein the object side of the first lens is convex and the image side is concave.

[0104] The second lens is a spherical lens with negative optical power, and the object side and the image side of the second lens are concave.

[0105] The third lens is a spherical lens with positive optical power, and the object side and the image side of the third lens are convex.

[0106] The fourth lens is a spherical lens with negative optical power. The object side and the image side of the fourth lens are concave. The third lens and the fourth lens are cemented lenses formed by cementing.

[0107] The fifth lens is a spherical lens with positive optical power, wherein the object side and the image side are both convex.

[0108] The sixth lens is a spherical lens with negative optical power, wherein the object side of the sixth lens is convex and the image side is concave.

[0109] The seventh lens is a spherical lens with positive optical power. The object side and the image side of the seventh lens are convex. The sixth lens and the seventh lens are cemented lenses formed by cementing.

[0110] The eighth lens is a spherical lens with positive optical power, wherein the object side and the image side of the eighth lens are convex.

[0111] The ninth lens is a spherical lens with negative optical power. The object side of the ninth lens is concave and the image side is convex. The eighth lens and the ninth lens are cemented lenses formed by cementing.

[0112] An image acquisition element is disposed on the image side of the protective glass;

[0113] The lens also includes an aperture stop, which is located between the seventh lens and the eighth lens.

[0114] The lens satisfies the following conditions:

[0115] -22.9≤f1 / f≤-24.6,

[0116] -6.88≤f² / f≤-9.24

[0117] -6.23≤f³ / f≤-8.36

[0118] 15.29≤f4 / f≤18.96

[0119] 7.51≤f5 / f≤10.05

[0120] 5.74≤f6 / f≤8.43

[0121] The center thicknesses of each lens are (2-6), (1-4), (3-9), (1-5), (3-9), and (3-7) respectively, and the air gaps are (15-21), (1-5), (10.5-15.5), (1-4), (1-5), and (5-10) respectively.

[0122] The center thicknesses are respectively for the first lens, the second lens, the first cemented lens (composed of the third and fourth lenses), the fifth lens, the second cemented lens (the sixth and seventh lenses), and the third cemented lens (the eighth and ninth lenses);

[0123] The air gaps are for the first lens and the second lens, and so on, with the last air gap being the third cemented lens to the image plane.

[0124] In the formula, f is the total focal length of the lens, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the first cemented lens, f4 is the focal length of the fifth lens, f5 is the focal length of the second cemented lens, and f6 is the focal length of the third cemented lens.

[0125] Furthermore, the focal length, refractive index, radius of curvature, and Abbe constant (VD) of the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, and ninth lens respectively satisfy the following conditions:

[0126] f1 -55.61～-48.02 ND1 1.50～1.55 R11 49.67～58.23 R12 15.26～21.54 VD1 60.32～70.95 f2 -20.12～-15.31 ND2 1.55～1.60 R21 -130.58～-113.96 R22 8.23～15.69 VD2 55.94～68.72 f3 457.53～479.69 ND3 1.68～1.73 R31 410.36～496.25 R32 -301.69～-347.82 VD3 25.23～35.41 f4 -17.93～-11.73 ND4 1.53～1.59 R41 -298.24～-329.88 R42 5.68～12.11 VD4 64.29～77.13 f5 35.08～40.54 ND5 1.67～1.74 R51 63.23～73.56 R52 -47.69～-37.81 VD5 23.48～36.97 f6 21.33～26.08 ND6 1.74～1.81 R61 8.55～14.29 R62 3.95～10.84 VD6 43.88～56.29 f7 -60.17～-54.82 ND7 1.53～1.60 R71 4.82～9.46 R72 -51.21～-39.43 VD7 50.34～61.62 f8 16.04～21.31 ND8 1.70～1.77 R81 7.24～15.91 R82 -9.58～-1.16 VD8 47.42～56.91 f9 1609.85～1623.27 ND9 1.81～1.88 R91 -7.85～-2.11 R92 -49.19～-30.57 VD9 18.36～28.11

[0127] Where f1 is the focal length of the first lens, ND1 is the refractive index of the first lens, R11 is the radius of curvature of the object side of the first lens, R12 is the radius of curvature of the image side of the first lens, and VD1 is the Abbe constant of the first lens.

[0128] f2 is the focal length of the second lens, ND2 is the refractive index of the second lens, R21 is the radius of curvature of the object side of the second lens, R22 is the radius of curvature of the image side of the second lens, and VD2 is the Abbe constant of the second lens.

[0129] f3 is the focal length of the third lens, ND3 is the refractive index of the third lens, R31 is the radius of curvature of the object side of the third lens, R32 is the radius of curvature of the image side of the third lens, and VD3 is the Abbe constant of the third lens.

[0130] f4 is the focal length of the fourth lens, ND4 is the refractive index of the fourth lens, R41 is the radius of curvature of the object side of the fourth lens, R42 is the radius of curvature of the image side of the fourth lens, and VD4 is the Abbe constant of the fourth lens.

[0131] f5 is the focal length of the fifth lens, ND5 is the refractive index of the fifth lens, R51 is the radius of curvature of the object side of the fifth lens, R52 is the radius of curvature of the image side of the fifth lens, and VD5 is the Abbe constant of the fifth lens.

[0132] f6 is the focal length of the sixth lens, ND6 is the refractive index of the sixth lens, R61 is the radius of curvature of the object side of the sixth lens, R62 is the radius of curvature of the image side of the sixth lens, and VD6 is the Abbe constant of the sixth lens.

[0133] f7 is the focal length of the seventh lens, ND7 is the refractive index of the seventh lens, R71 is the radius of curvature of the object side of the seventh lens, R72 is the radius of curvature of the image side of the seventh lens, and VD7 is the Abbe constant of the seventh lens.

[0134] f8 is the focal length of the eighth lens, ND8 is the refractive index of the eighth lens, R81 is the radius of curvature of the object side of the eighth lens, R82 is the radius of curvature of the image side of the eighth lens, and VD8 is the Abbe constant of the eighth lens.

[0135] f9 is the focal length of the ninth lens, ND9 is the refractive index of the ninth lens, R91 is the radius of curvature of the object side of the ninth lens, R92 is the radius of curvature of the image side of the ninth lens, and VD9 is the Abbe constant of the ninth lens.

[0136] The "-" sign indicates that the surface bends towards one side of the object.

[0137] In this invention, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region; if the lens surface is not defined as convex, concave, or flat, it means that the lens surface can be convex, concave, or flat. The surface of each lens closest to the object being photographed is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0138] like Figure 1As shown, the surface of the lens adjacent to the object plane of the optical system of the present invention is the object-side surface, and the surface of the lens adjacent to the image plane is the image-side surface. Along the optical axis of the lens from the object side to the image side, it sequentially includes: a lens G1 with negative optical power, a lens G2 with negative optical power, a cemented lens G3 with negative optical power, a lens G4 with positive optical power, a cemented lens G5 with positive optical power, and a cemented lens G6 with positive optical power. An aperture stop is provided in the optical path between the cemented lens G5 and the cemented lens G6.

[0139] The lens element satisfies the following conditions:

[0140] -22.9≤f1 / f≤-24.6

[0141] -6.88≤f² / f≤-9.24

[0142] -6.23≤f³ / f≤-8.36

[0143] 15.29≤f4 / f≤18.96

[0144] 7.51≤f5 / f≤10.05

[0145] 5.74≤f6 / f≤8.43

[0146] Where f is the total focal length of the lens, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the first cemented lens, f4 is the focal length of the fifth lens, f5 is the focal length of the second cemented lens, and f6 is the focal length of the third cemented lens.

[0147] Example 1

[0148] The parameters of each lens are shown in Table 1. Table 1 provides the radius of curvature (in mm), center thickness / air gap (in mm), refractive index (ND), and Abbe constant (VD) of each lens, including the first lens L1, the second lens L2, the first cemented lens L3, the fifth lens L4, the second cemented lens L5, and the third cemented lens L6.

[0149] Table 1

[0150]

[0151]

[0152] L4 refers to the fifth lens, therefore its radius of curvature, center thickness / air gap, refractive index, and Abbe constant refer to the fifth lens; L5 refers to the second cemented lens (formed by cementing the sixth and seventh lenses), therefore its radius of curvature corresponds to the radius of curvature of the first surface of the sixth lens and the second surface of the seventh lens, its center thickness is the sum of the center thicknesses of the sixth and seventh lenses, and its refractive index and Abbe constant are the refractive index and Abbe constant of the sixth and seventh lenses, respectively; L6 refers to the third cemented lens (formed by cementing the eighth and ninth lenses), therefore its radius of curvature corresponds to the radius of curvature of the first surface of the eighth lens and the second surface of the ninth lens, its center thickness is the sum of the center thicknesses of the eighth and ninth lenses, and its refractive index and Abbe constant are the refractive index and Abbe constant of the eighth and ninth lenses, respectively.

[0153] Reference Figure 1 The diagram shown is a schematic of the optical structure and optical path structure. In this embodiment, the total focal length of the system is f = 2.18 mm, the aperture value is F# = 2, the DFOV angle is 170°, and the total optical length of the lens is TTL = 72.8 mm.

[0154] In this embodiment, the first lens is a meniscus lens with negative optical power and convex surface facing the object side. Its function is to quickly converge light. The Abbe constants of the first lens 1 and the second lens 2 are ≥58.5. This combination can reduce the chromatic aberration of the system, taking into account the aberrations of the optical system and the problem of day and night confocality.

[0155] In this embodiment, the MTF curve and F-Theta distortion curve of the lens are respectively as follows: Figure 2 , Figure 3 As shown.

[0156] The image shows the MTF curve of the fisheye lens in this embodiment. The horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. From Figure 2 As can be seen, the lens has a resolution of over 0.45 at a spatial frequency of 125 lp / mm, indicating that the fisheye lens has a high resolution.

[0157] The image shown is an F-Theta distortion diagram of the fisheye lens in this embodiment. The horizontal axis represents the F-Theta distortion (unit: %), and the vertical axis represents the half field of view (unit: °). Figure 3 As can be seen, the F Theta distortion of the lens is small and less than 15%, indicating that the distortion of the fisheye lens is well corrected and the actual image will not be too distorted compared to the real scene.

[0158] Example 2

[0159] The parameters of each lens are shown in Table 2. Table 2 gives the radius of curvature (in mm), center thickness / air gap (in mm), refractive index (ND), and Abbe constant (VD) of the first lens L1, the second lens L2, the first cemented lens L3, the fourth lens L4, the second cemented lens L5, and the third cemented lens L6.

[0160] Table 2

[0161]

[0162] Reference Figure 4 The diagram shown is a schematic of the optical structure and optical path structure. In this embodiment, the total focal length of the system is f = 2.16 mm, the aperture value is F# = 2, the DFOV angle is 170°, and the total optical length of the lens is TTL = 71.8 mm.

[0163] In this embodiment, the first lens is a meniscus lens with negative optical power and convex surface facing the object side. Its function is to quickly converge light. The Abbe constants of the first lens 1 and the second lens 2 are ≥58.5. This combination can reduce the chromatic aberration of the system, taking into account the aberrations of the optical system and the problem of day and night confocality.

[0164] In this embodiment, the MTF curve and F-Theta distortion curve of the lens are respectively as follows: Figure 5 , Figure 6 As shown.

[0165] The image shows the MTF curve of the fisheye lens in this embodiment. The horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. From Figure 5 As can be seen, at a spatial frequency of 125 lp / mm, the lens is matched with a value above 0.45, indicating that the fisheye lens has a high resolution.

[0166] The image shows the F-Theta distortion of the fisheye lens in this embodiment. The horizontal axis represents the F-Theta distortion (unit: %), and the vertical axis represents the half field of view (unit: °). From Figure 6 As can be seen, the F Theta distortion of the lens is small and less than 15%, indicating that the distortion of the fisheye lens is well corrected and the actual image will not be too distorted compared to the real scene.

[0167] Example 3

[0168] The parameters of each lens are shown in Table 3. Table 3 gives the radius of curvature (in mm), center thickness / air gap (in mm), refractive index (ND), and Abbe constant (VD) of the first lens L1, second lens L2, first cemented lens L3, fourth lens L4, second cemented lens L5, and third cemented lens L6.

[0169] Table 3

[0170]

[0171]

[0172] Reference Figure 7 The diagram shown is a schematic of the optical structure and optical path structure. In this embodiment, the total focal length of the system is f = 2.15mm, the aperture value is F# = 2, the DFOV angle is 170°, and the total optical length of the lens is TTL = 74.6mm.

[0173] In this embodiment, the first lens is a meniscus lens with negative optical power and convex surface facing the object side. Its function is to quickly converge light. The Abbe constants of the first lens 1 and the second lens 2 are ≥58.5. This combination can reduce the chromatic aberration of the system, taking into account the aberrations of the optical system and the problem of day and night confocality.

[0174] In this embodiment, the MTF curve and F-Theta distortion curve of the lens are respectively as follows: Figure 8 , Figure 9 As shown.

[0175] The image shows the MTF curve of the fisheye lens in this embodiment. The horizontal axis represents the spatial frequency (unit: lp / mm), and the vertical axis represents the MTF value. From Figure 8 As can be seen, at a spatial frequency of 125 lp / mm, the lens is matched with a value above 0.45, indicating that the fisheye lens has a high resolution.

[0176] The image shows the F-Theta distortion of the fisheye lens in this embodiment. The horizontal axis represents the F-Theta distortion (unit: %), and the vertical axis represents the half field of view (unit: °). From Figure 9 As can be seen, the F Theta distortion of the lens is small and less than 15%, indicating that the distortion of the fisheye lens is well corrected and the actual image will not be too distorted compared to the real scene.

[0177] This application also provides an electronic device that may include the low-light full-wave fisheye lens of the above embodiments of this application and an imaging element for converting the optical image formed by the low-light full-wave fisheye lens into an electrical signal. This electronic device may be a stand-alone electronic device, such as a rangefinder camera, or an imaging module integrated into a rangefinder device. Furthermore, the electronic device may also be a stand-alone imaging device, such as an automotive camera, or an imaging module integrated into applications such as driver assistance systems, monitoring, engineering surveying, and photography.

[0178] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions, and improvements made by those skilled in the art within the scope of the technology disclosed in the present invention, and within the spirit and principles of the present invention, should be included within the scope of protection of the present invention. Furthermore, all content not described in detail in this specification is prior art known to those skilled in the art.

Claims

1. A micro-light full-wave fisheye lens, defining the surface adjacent to the object side of the lens as the object side surface, and the surface adjacent to the image side of the lens as the image side surface, characterized in that, In order from the object side to the image side along the optical axis of the lens: a first lens, which is a spherical lens with negative focal power, the object side of the first lens being convex, and the image side being concave; a second lens, which is a spherical lens with negative focal power, the object side of the second lens being concave, and the image side being concave; a third lens, which is a spherical lens with positive focal power, the object side of the third lens being convex, and the image side being convex; a fourth lens, which is a spherical lens with negative focal power, the object side of the fourth lens being concave, and the image side being concave, and the third lens and the fourth lens being a cemented lens formed by cementing; a fifth lens, which is a spherical lens with positive focal power, the object side of the fifth lens being convex, and the image side being convex; a sixth lens, which is a spherical lens with negative focal power, the object side of the sixth lens being convex, and the image side being concave; a seventh lens, which is a spherical lens with positive focal power, the object side of the seventh lens being convex, and the image side being convex, and the sixth lens and the seventh lens being a cemented lens formed by cementing; an eighth lens, which is a spherical lens with positive focal power, the object side of the eighth lens being convex, and the image side being convex; a ninth lens, which is a spherical lens with negative focal power, the object side of the ninth lens being concave, and the image side being convex, and the eighth lens and the ninth lens being a cemented lens formed by cementing; the lens further comprising an image capturing element, which is arranged on the image side of the protective glass; the lens further comprising an aperture stop, which is located between the seventh lens and the eighth lens; the lens satisfies the following conditions: -22.9≤f1 / f≤-24.6, -6.88≤f2 / f≤-9.24 -6.23≤f3 / f≤-8.36 15.29≤f4 / f≤18.96 7.51≤f5 / f≤10.05 5.74≤f6 / f≤8.43 wherein: f is the total focal length of the lens, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the first cemented lens, f4 is the focal length of the fifth lens, f5 is the focal length of the second cemented lens, and f6 is the focal length of the third cemented lens.

2. The micro-light full-wave fisheye lens according to claim 1, characterized in that: the focal lengths 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, the first cemented lens, the second cemented lens, and the third cemented lens satisfy the following conditions: The first lens: -55.61~ -48.02; the second lens: -20.12~ -15.31; the third lens: 457.53~479.69; the fourth lens: -17.93~ -11.73; the fifth lens: 35.08~40.54; the sixth lens: 21.33~26.08; the seventh lens: -60.17~ -54.82; the eighth lens: 16.04~21.31; the ninth lens: 1609.85~1623.27; the first cemented lens: -13.58~ -18.22; the second cemented lens: 16.37~21.91; the third cemented lens: 12.51~18.

38. 3.The micro-light full-wave fisheye lens according to claim 2, characterized in that: The refractive indexes 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 and the ninth lens satisfy the following conditions: ND1: 1.50~1.55; ND2: 1.55~1.60; ND3: 1.68~1.73; ND4: 1.53~1.59; ND5: 1.67~1.74; ND6: 1.74~1.81; ND7: 1.53~1.60; ND8: 1.70~1.77; ND9: 1.81~1.88; wherein: ND1 is the refractive index of the first lens; ND2 is the refractive index of the second lens; ND3 is the refractive index of the third lens; ND4 is the refractive index of the fourth lens; ND5 is the refractive index of the fifth lens; ND6 is the refractive index of the sixth lens; ND7 is the refractive index of the seventh lens; ND8 is the refractive index of the eighth lens; ND9 is the refractive index of the ninth lens. 4.The micro-light full-wave fisheye lens according to claim 3, characterized in that: The curvature radii 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 and the ninth lens satisfy the following conditions: R11: 49.67~58.23; R12: 15.26~21.54; R21: -130.58~ -113.96; R22: 8.23~15.69; R31: 410.36~496.25; R32: -301.69~ -347.82; R41: -298.24~ -329.88; R42: 5.68~12.11; R51: 63.23~73.56; R52: -47.69~ -37.81; R61: 8.55~14.29; R62: 3.95~10.84; R71: 4.82~9.46; R72: -51.21~ -39.43; R81: 7.24~15.91; R82: -9.58~ -1.16; R91: -7.85~ -2.11; R92: -49.19~ -30.57; wherein: R11 is the object-side curvature radius of the first lens, and R12 is the image-side curvature radius of the first lens; R21 is a curvature radius of an object side surface of the second lens, and R22 is a curvature radius of an image side surface of the second lens; R31 is a curvature radius of an object side surface of the third lens, and R32 is a curvature radius of an image side surface of the third lens; R41 is a curvature radius of an object side surface of the fourth lens, and R42 is a curvature radius of an image side surface of the fourth lens; R51 is a curvature radius of an object side surface of the fifth lens, and R52 is a curvature radius of an image side surface of the fifth lens; R61 is a curvature radius of an object side surface of the sixth lens, and R62 is a curvature radius of an image side surface of the sixth lens; R71 is a curvature radius of an object side surface of the seventh lens, and R72 is a curvature radius of an image side surface of the seventh lens; R81 is a curvature radius of an object side surface of the eighth lens, and R82 is a curvature radius of an image side surface of the eighth lens; R91 is a curvature radius of an object side surface of the ninth lens, and R92 is a curvature radius of an image side surface of the ninth lens.

5. The micro-light full-wave fish-eye lens according to claim 4, wherein: Abbe numbers 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 and the ninth lens satisfy the following conditions: VD1: 60.32~70.95; VD2: 55.94~68.72; VD3: 25.23~35.41; VD4: 64.29~77.13; VD5: 23.48~36.97; VD6: 43.88~56.29; VD7: 50.34~61.62; VD8: 47.42~56.91; VD9: 18.36~28.11; VD1 is the Abbe number of the first lens; VD2 is the Abbe number of the second lens; VD3 is the Abbe number of the third lens; VD4 is the Abbe number of the fourth lens; VD5 is the Abbe number of the fifth lens; VD6 is the Abbe number of the sixth lens; VD7 is the Abbe number of the seventh lens; VD8 is the Abbe number of the eighth lens; VD9 is the Abbe number of the ninth lens.

6. The micro-light full-wave fish-eye lens according to claim 5, wherein: a focal length of the first lens is -51.9, a focal length of the second lens is -17.4, a focal length of the third lens is -15.29, a focal length of the fifth lens is 38.02, a focal length of the second cemented lens is 19.31, and a focal length of the third cemented lens is 14.1; ND1 is 1.53, ND2 is 1.56, ND3 is 1.69, ND4 is 1.58, ND5 is 1.68, ND6 is 1.75, ND7 is 1.55, ND8 is 1.71, and ND9 is 1.82; VD1 is 63.22, VD2 is 60.25, VD3 is 28.51, VD4 is 65.91, VD5 is 30.5, VD6 is 48.6, VD7 is 52.21, VD8 is 50.49, and VD9 is 20.

08. The first lens has a first surface with a curvature radius of 57.93 and a second surface with a curvature radius of 15.48; the second lens has a first surface with a curvature radius of -119.56 and a second surface with a curvature radius of 12.98; the first cemented lens has a first surface with a curvature radius of 429.81 and a second surface with a curvature radius of 10.05; the fifth lens has a first surface with a curvature radius of 68.45 and a second surface with a curvature radius of -41.95; the second cemented lens has a first surface with a curvature radius of 11.89 and a second surface with a curvature radius of -42.31; and the third cemented lens has a first surface with a curvature radius of 10.17 and a second surface with a curvature radius of -38.

27. The center thickness of L1 is 4, the center thickness of L2 is 2, the center thickness of L3 is 5.5, the center thickness of L4 is 3.5, the center thickness of L5 is 6, and the center thickness of L6 is 5; the air gap between L1 and L2 is 17, the air gap between L2 and L3 is 4, the air gap between L3 and L4 is 11.8, the air gap between L4 and L5 is 3, the air gap between L5 and L6 is 3, and the air gap between L6 and the image surface is 8.

7. An electronic device, comprising: The micro-light full-wave fisheye lens and the imaging element for converting the optical image formed by the micro-light full-wave fisheye lens into an electrical signal.

Images