Ultra-wide-angle lens

Abstract

The utility model relates to an ultra-wide-angle lens, which is arranged along an optical axis in a direction from an object side to an image side. The utility model relates to a multi-lens zoom lens, which sequentially comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with negative focal power, a fourth lens with positive focal power, a fifth lens, a sixth lens with positive focal power, a seventh lens with positive focal power, an eighth lens with negative focal power and a ninth lens with positive focal power, the object side surface of the sixth lens is convex; the optical total length TTL, the total focal length f and the image height H under the maximum field angle of the ultra-wide-angle lens meet the following relation: TTL * f / H is more than or equal to 6.9 and less than or equal to 7.4. The ultra-wide-angle lens of the utility model at least has one of the characteristics of large field of view FOV > = 196 DEG optical total length, good thermal stability, high resolution, large aperture (FNO < = 1.8), high illumination and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of imaging lenses, and in particular to an ultra-wide-angle lens having the characteristics of a large field of view, a large aperture, high resolution, high illumination, and low cost. Background Art

[0002] With the development of optical imaging lenses, the demand for lenses in the fields of panoramic monitoring, drones, sports cameras and automotive lenses continues to increase, thus putting forward higher requirements for optical imaging lenses. The details are as follows:

[0003] 1. To capture a wider range of targets, optical imaging lenses require a wide field of view.

[0004] 2. In order to obtain more light, the optical imaging lens is required to have a large aperture;

[0005] 3. Existing technology lenses have the defect of not being able to achieve high resolution and high brightness at the same time, so optical imaging lenses are required to have high resolution and high illumination;

[0006] 4. To ensure good thermal stability, existing technology lenses use materials with stable thermal expansion coefficients, resulting in high costs and poor market competitiveness, thus putting forward low-cost requirements for optical imaging lenses.

[0007] Therefore, designing an ultra-wide-angle lens with one of the characteristics of large field of view, large aperture, high resolution, high illumination, and low cost has become a market development trend. Utility Model Content

[0008] In order to solve the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide an ultra-wide-angle lens having at least one of the following characteristics: a large field of view FOV ≥ 196°, a short optical total length, good thermal stability, high resolution, a large aperture (FNO ≤ 1.8), and high illumination.

[0009] To achieve the above-mentioned purpose, the present invention provides an ultra-wide-angle lens, which comprises, in order from the object side to the image side of the optical axis: a first lens having negative optical power, a second lens having negative optical power, a third lens having negative optical power, a fourth lens having positive optical power, a fifth lens, a sixth lens having positive optical power, a seventh lens having positive optical power, an eighth lens having negative optical power, and a ninth lens having positive optical power.

[0010] The first lens is a convex-concave lens, and the object-side surface of the sixth lens is convex;

[0011] The total optical length TTL, the total focal length f, and the image height H at the maximum field of view of the ultra-wide-angle lens satisfy the following relationship: 6.9≤TTL*f / H≤7.4.

[0012] According to a technical solution of the present invention, the optical system further includes a tenth lens located on the object side of the first lens, and the tenth lens has negative optical power.

[0013] According to a technical solution of the present invention, the tenth lens is a convex-concave lens.

[0014] According to a technical solution of the present invention, the optical effective aperture D10 of the tenth lens and the effective focal length f10 of the tenth lens satisfy the following relationship: -0.3≤D10 / f10<0.

[0015] According to a technical solution of the present utility model, the second lens is a convex-concave lens, and the object side surface of the third lens is concave;

[0016] According to a technical solution of the present invention, the seventh lens is a convex-convex lens, the object-side surface of the eighth lens is concave, and the object-side surface of the ninth lens is convex.

[0017] According to a technical solution of the present utility model, the third lens is cemented to the fourth lens, or the fourth lens is cemented to the fifth lens.

[0018] According to a technical solution of the present utility model, the seventh lens and the eighth lens form a cemented lens.

[0019] According to a technical solution of the present invention, the effective focal length f1 of the first lens and the total focal length f of the ultra-wide-angle lens satisfy the following relationship: -6.3≤f1 / f≤-4.

[0020] According to a technical solution of the present invention, the combined effective focal length f12 of the first lens and the second lens and the effective focal length f of the ultra-wide-angle lens satisfy the following relationship: -1.8≤f12 / f≤-1.6.

[0021] According to a technical solution of the present invention, the effective focal length f2 of the second lens and the total focal length f of the ultra-wide-angle lens satisfy the following relationship: -4≤f2 / f≤-2.6.

[0022] According to a technical solution of the present invention, the effective focal length f2 of the second lens and the image side curvature radius R22 of the second lens satisfy the following relationship: -2.9≤f2 / R22≤-1.6.

[0023] According to a technical solution of the present invention, the effective focal length f3 of the third lens and the total focal length f of the ultra-wide-angle lens satisfy the following relationship: -6.7≤f3 / f≤-3.8.

[0024] According to a technical solution of the present invention, the effective focal length f4 of the fourth lens and the total focal length f of the ultra-wide-angle lens satisfy the following relationship: 2.1≤f4 / f≤7.

[0025] According to a technical solution of the present invention, the effective focal length f6 of the sixth lens and the effective focal length f5 of the fifth lens satisfy the following relationship: 0<|f6 / f5|≤1.2.

[0026] According to a technical solution of the present invention, the effective focal length f6 of the sixth lens and the effective focal length fb of the rear lens group satisfy the following relationship: 1.35≤f6 / fb≤3.

[0027] According to a technical solution of the present invention, the effective focal length f7 of the seventh lens and the effective focal length f8 of the eighth lens satisfy the following relationship: -1.67≤f7 / f8≤-0.8.

[0028] According to a technical solution of the present invention, the effective focal length f9 of the ninth lens and the total focal length f of the ultra-wide-angle lens satisfy the following relationship: 2.7≤f9 / f≤5.

[0029] According to a technical solution of the present invention, the image-side curvature radius R92 of the ninth lens and the effective focal length f9 of the ninth lens satisfy the following relationship: 0.8≤|R92 / f9|≤2.5.

[0030] According to a technical solution of the present invention, the effective focal length fa of the front lens group and the total focal length f of the ultra-wide-angle lens satisfy the following relationship: -5.6≤fa / f≤-3.4.

[0031] According to a technical solution of the present invention, the effective focal length fb of the rear lens group and the total focal length f of the ultra-wide-angle lens satisfy the following relationship: 2.8≤fb / f≤3.2.

[0032] According to a technical solution of the present invention, the effective focal length fa of the front lens group and the effective focal length fb of the rear lens group satisfy the following relationship: -1.75≤fa / fb≤-1.2.

[0033] According to a technical solution of the present invention, the maximum field of view FOV, the image height H at the maximum field of view, and the maximum clear aperture D of the ultra-wide-angle lens satisfy the following relationship: 3.4≤FOV / H / D≤3.75.

[0034] According to a technical solution of the present invention, the combined effective focal length f345 of the third lens to the fifth lens and the effective focal length fa of the front lens group satisfy the following relationship: -3≤f345 / fa≤-1.3.

[0035] According to a technical solution of the present invention, the back focal length BFL of the ultra-wide-angle lens and the total focal length f of the ultra-wide-angle lens satisfy the following relationship: 1.3≤BFL / f≤1.5.

[0036] According to a technical solution of the present invention, the Abbe number Vd4 of the fourth lens and the Abbe number Vd5 of the fifth lens satisfy the following relationship: 1≤|Vd4-Vd5|≤15;

[0037] The Abbe number Vd7 of the seventh lens and the Abbe number Vd8 of the eighth lens satisfy the following relationship: 40≤|Vd7−Vd8|≤67.

[0038] According to a technical solution of the present invention, the image height H corresponding to the maximum field angle of the ultra-wide-angle lens is 4.5mm-4.7mm.

[0039] According to a technical solution of the present invention, the ultra-wide-angle lens satisfies at least one of the following conditions:

[0040] -6.3≤f1 / f≤-4.2,

[0041] -3.9≤f2 / f≤-2.8,

[0042] -1.75≤f12 / f≤-1.6,

[0043] -2.8≤f2 / R22≤-1.8,

[0044] -6.2≤f3 / f≤-4,

[0045] 2.15≤f4 / f≤6.8,

[0046] 0.25≤|f6 / f5|≤1.05,

[0047] 1.4≤f6 / fb≤2.85,

[0048] -1.6≤f7 / f8≤-0.9,

[0049] 2.9≤f9 / f≤4.85,

[0050] 0.9≤|R92 / f9|≤2.1,

[0051] -5.15≤fa / f≤-3.75,

[0052] 2.8≤fb / f≤3.2,

[0053] -1.65≤fa / fb≤-1.25,

[0054] -3≤f345 / fa≤-1.4,

[0055] 3.4≤FOV / H / D≤3.7,

[0056] 1.3≤BFL / f≤1.45,

[0057] 6.95≤TTL*F / H≤7.4,

[0058] 1≤|Vd4-Vd5|≤14,

[0059] 43.5≤|Vd7-Vd8|≤64.5,

[0060] Wherein, D10 is the optical effective aperture of the tenth lens; f10 is the effective focal length of the tenth lens; f1 is the effective focal length of the first lens; f is the total focal length of the ultra-wide-angle lens; f2 is the effective focal length of the second lens; f12 is the combined effective focal length of the first lens and the second lens; R22 is the radius of curvature of the image side of the second lens; f3 is the effective focal length of the third lens; f4 is the effective focal length of the fourth lens; f6 is the effective focal length of the sixth lens; f5 is the effective focal length of the fifth lens; fb is the effective focal length of the rear lens group; f7 is the effective focal length of the seventh lens; f8 is the effective focal length of the eighth lens; f9 is the effective focal length of the ninth lens; R92 is the radius of curvature of the image side surface of the ninth lens; fa is the effective focal length of the front lens group; f345 is the combined effective focal length of the third lens to the fifth lens; FOV is the maximum field of view of the ultra-wide-angle lens; H is the image height at the maximum field of view of the ultra-wide-angle lens; D is the maximum clear aperture of the ultra-wide-angle lens; TTL is the total optical length of the ultra-wide-angle lens; BFL is the back focal length of the ultra-wide-angle lens; Vd4 is the Abbe number of the fourth lens; Vd5 is the Abbe number of the fifth lens; Vd7 is the Abbe number of the seventh lens; Vd8 is the Abbe number Vd8 of the eighth lens.

[0061] According to a technical solution of the present invention, the optical effective aperture D10 of the tenth lens and the effective focal length f10 of the tenth lens (L10) satisfy the following relationship: -0.3≤D10 / F10≤-0.1.

[0062] According to the solution of the present invention, by setting the relationship between the number of ultra-wide-angle lenses and the optical power, the ultra-wide-angle lenses have at least one of the following characteristics: short optical length and good thermal stability, a large field of view FOV ≥ 196°, the ability to be used with a camera to achieve high resolution (25 million pixels), a large aperture (FNO ≤ 1.8), and high illumination (relative illumination ≥ 63%). BRIEF DESCRIPTION OF THE DRAWINGS

[0063] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0064] Figure 1 Schematic diagram of the structure of the ultra-wide-angle lens of Example 1 of the present utility model;

[0065] Figure 2 This is a schematic structural diagram of the ultra-wide-angle lens of Example 2 of the present utility model;

[0066] Figure 3 This is a schematic structural diagram of the ultra-wide-angle lens of Example 3 of the present utility model;

[0067] Figure 4 Schematic diagram of the structure of the ultra-wide-angle lens of Example 4 of the present invention. DETAILED DESCRIPTION

[0068] For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely descriptions of exemplary embodiments of the present application and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0069] It should be noted that in this specification, the expressions first, second, third, etc. are only used to distinguish one feature from another, and do not represent any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the first lens.

[0070] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0071] In this article, the paraxial region refers to the area near the optical axis. If a lens surface is convex and the location of the convex surface is undefined, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the location of the concave surface is undefined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject 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.

[0072] It should also be understood that the terms "comprises," "including," "having," "includes," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application." And, the term "exemplary" is intended to refer to an example or illustration.

[0073] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which this application belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and will not be interpreted in an idealized or overly formal sense unless expressly defined as such herein.

[0074] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The following examples only express several implementation methods of the present application, and their descriptions are relatively specific and detailed, but they should not be understood as limiting the scope of the patent application. It should be pointed out that for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all fall within the scope of protection of the present application.

[0075] like Figures 1 to 4 As shown, an embodiment of the present invention provides an ultra-wide-angle lens, comprising, along the optical axis from the object side to the image side, the following: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, an aperture stop STO, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, and a cover glass plate CG. The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 form a front lens group, and the sixth lens L6, the seventh lens L7, the eighth lens L8, and the ninth lens L9 form a rear lens group.

[0076] The first lens element L1 is a convex-concave lens with negative optical power. It can effectively converge light rays with a large field of view, reducing the angle of incidence of light rays on the object side of the second lens element L2. This effectively avoids high-order aberrations in subsequent optical lenses caused by excessively large angles of incidence, thereby improving the resolution performance of the lens.

[0077] The second lens L2 is a convex-concave lens with negative optical power, which is beneficial for controlling the direction of light, making the light transition smoother, and better correcting the aberration of the central field of view area, thereby improving the resolution of the lens.

[0078] The third lens element L3 has negative optical power and a concave object-side surface. The fourth lens element L4 has positive optical power and is preferably a glass lens. The negative optical power of the third lens element L3 and the positive optical power of the fourth lens element L4 work together to better correct the spherical aberration of the optical system and improve the lens's resolution. The fourth lens element L4 and the fifth lens element L5 work together to better correct the optical system's spherical aberration and effectively correct axial chromatic aberration. They also effectively reduce the lens' tolerance sensitivity and improve the lens' production yield.

[0079] The fifth lens element L5 is preferably a glass lens. The object-side surface of the sixth lens element L6 is convex and has positive focal power. The interaction between the fifth lens element L5 and the sixth lens element L6 effectively corrects axial chromatic aberration and controls the distribution of light before and after the stop, enabling a wider aperture, with an FNO of ≤1.8, effectively improving illumination. The sixth lens element L6 can be a spherical or aspherical lens. When the sixth lens element L6 is an aspherical lens, it is beneficial to correct residual astigmatism and axial chromatic aberration of the front lens group. When the sixth lens element L6 is a spherical lens, it is preferably made of a material with stable thermal expansion to facilitate thermal compensation of the optical lens.

[0080] The aperture STO is located between the fifth lens L5 and the sixth lens L6. By providing an aperture for limiting the light beam between the fifth lens L5 and the sixth lens L6, the imaging quality of the optical lens can be further improved, which is beneficial for focusing the light entering the optical system, reducing the rear port diameter of the optical system, and reducing the assembly sensitivity of the system.

[0081] The seventh lens element, L7, is a convex-convex lens with positive optical power. The eighth lens element, L8, has negative optical power and a concave object-side surface. The combination of the seventh and eighth lenses, L7 and L8, forms a cemented doublet, which facilitates smooth light transmission, reduces lens tolerance sensitivity, and effectively improves lens production yield. The eighth lens element, L8, also effectively corrects vertical axial chromatic aberration, enhancing image quality. The use of low-refractive-index, high-Abbe-number material in the seventh lens element effectively corrects vertical axial chromatic aberration in the optical system, improving image quality.

[0082] The ninth lens element L9 has positive refractive power and its object side surface is convex, which can effectively control the direction of light and effectively lower the exit angle of light passing through the ninth lens element L9, thereby reducing the main ray angle to better match the chip and the chip CRA curve requirements.

[0083] In some embodiments of the present invention, the combined effective focal length f345 of the third through fifth lenses L3 through L5 and the effective focal length fa of the front lens group satisfy the following relationship: -3 ≤ f345 / fa ≤ -1.3. By properly controlling the ratio of the combined effective focal length of the third through fifth lenses L3 through L5 to the effective focal length of the front lens group of the ultra-wide-angle lens, the trajectory of light can be effectively controlled, facilitating better correction of spherical aberration and axial chromatic aberration in the optical system. This also facilitates smooth light transitions, effectively reduces lens tolerance sensitivity, and improves lens production yield.

[0084] In some embodiments of the present invention, a tenth lens element L10 is further included, located on the object-side surface of the first lens element L1. The tenth lens element L10 is a convex-concave lens with negative optical power. This helps reduce the angle of incidence of incident light on the object-side surface of the first lens element L1, allowing the light to enter the rear optical system smoothly and effectively correcting aberrations of the rear optical group. Furthermore, the tenth lens element L10 is made of glass and can serve as a protective cover to protect the lens.

[0085] In some embodiments of the present invention, the optically effective aperture D10 of the tenth lens element L10 and the effective focal length f10 of the tenth lens element L10 satisfy the following relationship: -0.3 ≤ D10 / f10 < 0, preferably, -0.3 ≤ D10 / F10 ≤ -0.1. Properly configuring the ratio of the optically effective aperture D10 of the tenth lens element L10 to the effective focal length f10 of the tenth lens element L10 facilitates the entry of incident light at large angles into the optical system, effectively expanding the optical system's field of view (FOV) to 196° or greater, while also effectively preventing the generation of aberrations.

[0086] In some embodiments of the present invention, the effective focal length f1 of first lens element L1 and the overall focal length f of the ultra-wide-angle lens satisfy the following relationship: -6.3 ≤ f1 / f ≤ -4, preferably, -6.3 ≤ f1 / f ≤ -4.2. Properly controlling the effective focal length f1 of first lens element L1 effectively collects light rays from a wide field of view, reduces the angle of incidence of light rays on the object side of second lens element L2, and effectively prevents higher-order aberrations in subsequent optical lenses caused by excessively large angles of incidence, thereby improving the lens's resolution.

[0087] In some embodiments of the present invention, the combined effective focal length f12 of the first lens L1 and the second lens L2 satisfies the following relationship with the effective focal length f of the ultra-wide-angle lens: -1.8 ≤ f12 / f ≤ -1.6, preferably, -1.75 ≤ f12 / f ≤ -1.6. Properly configuring the combined effective focal length f12 of the first lens L1 and the second lens L2 effectively controls the trajectory of light, resulting in a divergent effect. This helps maximize the amount of wide-angle light entering the rear of the optical system, thereby improving the relative illumination of the lens.

[0088] In some embodiments of the present invention, the effective focal length f2 of the second lens element L2 satisfies the following relationship with the overall focal length f of the ultra-wide-angle lens: -4 ≤ f2 / f ≤ -2.6, preferably, -1.75 ≤ f12 / f ≤ -1.6. Properly configuring the effective focal length f2 of the second lens element L2 effectively controls the trajectory of light, resulting in a divergent effect. This helps maximize the amount of wide-angle light entering the rear of the optical system, thereby improving the relative illumination of the lens.

[0089] In some embodiments of the present invention, the effective focal length f2 of the second lens element L2 and the image-side curvature radius R22 of the second lens element L2 satisfy the following relationship: -2.9 ≤ f2 / R22 ≤ -1.6, preferably, -2.8 ≤ f2 / R22 ≤ -1.8. Properly configuring the ratio of the effective focal length f2 of the second lens element L2 to the image-side curvature radius R22 of the second lens element L2 helps control the trajectory of light, ensuring that it smoothly enters the object-side surface of the third lens element L3. This helps reduce the tolerance sensitivity of the optical lens, while also facilitating better correction of aberrations in the central field of view, thereby improving the lens's resolving power.

[0090] In some embodiments of the present invention, the effective focal length f3 of the third lens element L3 and the overall focal length f of the ultra-wide-angle lens satisfy the following relationship: -6.7 ≤ f3 / f ≤ -3.8, preferably, -6.2 ≤ f3 / f ≤ -4. Properly configuring the effective focal length f3 of the third lens element L3 facilitates correcting spherical aberration of the optical system and improving the resolving power of the lens.

[0091] In some embodiments of the present invention, the effective focal length f4 of the fourth lens element L4 and the overall focal length f of the ultra-wide-angle lens satisfy the following relationship: 2.1 ≤ f4 / f ≤ 7, preferably, 2.15 ≤ f4 / f ≤ 6.8. Properly configuring the effective focal length f4 of the fourth lens element L4 facilitates correction of spherical aberration and axial chromatic aberration of the optical system, thereby improving the resolving power of the lens.

[0092] In some embodiments of the present invention, the effective focal length f6 of the sixth lens element L6 and the effective focal length f5 of the fifth lens element L5 satisfy the following relationship: 0 < |f6 / f5| ≤ 1.2, preferably, 0.25 ≤ |f6 / f5| ≤ 1.05. This rational allocation of the focal lengths of the fifth lens element L5 and the sixth lens element L6 effectively corrects spherical aberration and axial chromatic aberration, improving the resolution of the lens. It also controls the distribution of light before and after the stop, facilitating a wider aperture, achieving an FNO ≤ 1.8 and effectively improving illumination. It also better eliminates thermal drift, facilitating thermal compensation of the optical lens, thereby enhancing its temperature performance.

[0093] In some embodiments of the present invention, the effective focal length f6 of the sixth lens element L6 and the effective focal length fb of the rear lens group satisfy the following relationship: 1.35 ≤ f6 / fb ≤ 3, preferably, 1.4 ≤ f6 / fb ≤ 2.85. Properly configuring the ratio of the effective focal length f6 of the sixth lens element L6 to the effective focal length fb of the rear lens group in the optical system facilitates smooth light transmission, reduces lens tolerance sensitivity, and effectively improves lens production yield.

[0094] In some embodiments of the present invention, the effective focal length f7 of the seventh lens element L7 and the effective focal length f8 of the eighth lens element L8 satisfy the following relationship: -1.67 ≤ f7 / f8 ≤ -0.8, preferably, -1.6 ≤ f7 / f8 ≤ -0.9. Properly configuring the focal length ratio of the seventh lens element L7 to the eighth lens element L8 and employing a combination of positive and negative focal powers of the seventh lens element L7 and the eighth lens element L8 facilitates balancing the astigmatism generated by the lens group behind the aperture, thereby improving resolution.

[0095] In some embodiments of the present invention, the effective focal length f9 of the ninth lens element L9 and the overall focal length f of the ultra-wide-angle lens satisfy the following relationship: 2.7 ≤ f9 / f ≤ 5, preferably 2.9 ≤ f9 / f ≤ 4.85. Properly allocating the effective focal length f9 of the ninth lens element L9 effectively controls light distribution and deflects the maximum field of view chief ray emitted by the eighth lens element L8, ensuring optimal compatibility with chip requirements.

[0096] In some embodiments of the present invention, the image-side curvature radius R92 of the ninth lens element L9 and its effective focal length f9 satisfy the following relationship: 0.8 ≤ |R92 / f9| ≤ 2.5, preferably, 0.9 ≤ |R92 / f9| ≤ 2.1. Properly controlling the ratio of the image-side curvature radius R92 of the ninth lens element L9 to its effective focal length f9 can effectively reduce the angle of incidence of light passing through L9, thereby reducing the chief ray angle, thereby better matching the chip and its CRA curve requirements, and enhancing the lens's tolerance and manufacturability.

[0097] In some embodiments of the present invention, the effective focal length fa of the front lens group and the total focal length f of the ultra-wide-angle lens satisfy the following relationship: -5.6≤fa / f≤-3.4, preferably, -5.15≤fa / f≤-3.75. Properly setting the effective focal length fa of the front lens group can bring the image-side principal plane of the entire optical system closer to the imaging plane, achieving a reverse telephoto effect for the optical system. This can effectively increase the back focal length of the optical lens, facilitating assembly of the optical lens module. Furthermore, lengthening the back focal length can help reduce the energy of ghost images generated by central reflections from the lens and color filters, thereby improving lens quality.

[0098] In some embodiments of the present invention, the effective focal length fb of the rear lens assembly and the total focal length f of the ultra-wide-angle lens satisfy the following relationship: 2.8 ≤ fb / f ≤ 3.2. Properly setting the effective focal length fb of the rear lens assembly can help achieve a wider aperture, with an aperture FNO ≤ 1.8.

[0099] In some embodiments of the present invention, the effective focal length fa of the front lens group and the effective focal length fb of the rear lens group satisfy the following relationship: -1.75 ≤ fa / fb ≤ -1.2, preferably, -1.65 ≤ fa / fb ≤ -1.25. Properly allocating the effective focal lengths of the front and rear lens groups helps control the overall light flow of the optical system, ensuring a smoother light transition, reducing system sensitivity, and improving imaging quality.

[0100] In some embodiments of the present invention, the maximum field of view (FOV) of the ultra-wide-angle lens, the image height (H) at the maximum field of view, and the maximum clear aperture (D) satisfy the following relationship: 3.4 ≤ FOV / H / D ≤ 3.75, preferably, 3.4 ≤ FOV / H / D ≤ 3.7. By controlling the ratio range of the maximum field of view (FOV) of the ultra-wide-angle lens, the image height (H) at the maximum field of view, and the maximum clear aperture (D), the viewpoint position can be effectively controlled to ensure that the clear aperture meets design requirements. When the image height is fixed, the shorter the focal length, the larger the field of view, and vice versa. By controlling the ratio range between the field of view, focal length, and image height, the lens can have a reasonable field of view for different sensors.

[0101] In some embodiments of the present invention, the ultra-wide-angle lens's total optical length (TTL), total focal length (f), and image height (H) at maximum field of view satisfy the following relationship: 6.9 ≤ TTL*f / H ≤ 7.4, preferably, 6.95 ≤ TTL*F / H ≤ 7.4. By properly adjusting the total optical length (TTL), total focal length (f), and image height (H), the entire optical lens can be made more compact and miniaturized.

[0102] In some embodiments of the present invention, the back focus length (BFL) of the ultra-wide-angle lens and the overall focal length (f) of the ultra-wide-angle lens satisfy the following relationship: 1.3 ≤ BFL / f ≤ 1.5, preferably 1.3 ≤ BFL / f ≤ 1.45. By controlling the system's optical back focus length (BFL), while achieving miniaturization, the lens' back focus is increased, which helps reserve space for optical component installation, facilitates optical lens assembly, avoids interference, and improves the assembly yield of the optical lens.

[0103] In some embodiments of the present invention, the Abbe number Vd4 of the fourth lens element L4 and the Abbe number Vd5 of the fifth lens element L5 satisfy the following relationship: 1≤|Vd4-Vd5|≤15, preferably, 1≤|Vd4-Vd5|≤14;

[0104] The Abbe number Vd7 of the seventh lens element L7 and the Abbe number Vd8 of the eighth lens element L8 satisfy the following relationship: 40 ≤ |Vd7 - Vd8| ≤ 67, preferably 43.5 ≤ |Vd7 - Vd8| ≤ 64.5. By selecting the appropriate materials for the fourth lens element L4, the fifth lens element L5, the seventh lens element L7, and the eighth lens element L8, and by using glass lenses for the fourth lens element L4, the fifth lens element L5, the seventh lens element L7, and the eighth lens element L8, vertical chromatic aberration of the optical system can be effectively corrected, purple fringing can be avoided, and imaging quality can be improved. Furthermore, the temperature-dependent shift in the back focus of the optical system can be suppressed, thereby improving system stability and enhancing lens quality.

[0105] In some embodiments of the present invention, the image height H corresponding to the maximum field angle of the ultra-wide-angle lens is 4.5 mm to 4.7 mm. Furthermore, the image height H corresponding to the maximum field angle of the ultra-wide-angle lens can be 4.6 mm.

[0106] In some embodiments of the present invention, at least lens L9, among lens elements L1 through L9, is an aspherical lens. Aspherical surfaces have a superior radius of curvature, improving distortion and aberrations. The use of aspherical surfaces can minimize aberrations that occur during imaging, thereby enhancing the resolving power of fixed-focus lenses.

[0107] In some embodiments of the present invention, the first lens to the ninth lens may be a glass-plastic hybrid lens, or all of them may be glass lenses. The use of glass lenses can effectively suppress the deviation of the back focal length of the fixed-focus lens caused by temperature changes, thereby improving the stability of the fixed-focus lens; at the same time, the glass lens can effectively avoid the problem of blurred imaging caused by high or low temperature environments, ensuring the normal use of the fixed-focus lens, and better correcting system chromatic aberration, thereby improving the resolution capability of the fixed-focus lens. The use of plastic lenses can effectively reduce production costs. In addition, the temperature range of the all-glass design optical lens is wider, and it can maintain stable optical performance in the range of -40°C to 85°C.

[0108] Specifically, when focusing on resolution quality and reliability, the first to ninth lenses can all be glass lenses; when considering production costs, the first to ninth lenses can be a glass-plastic hybrid.

[0109] The following four sets of specific embodiments are given based on the above-mentioned configuration of the present invention to specifically illustrate the ultra-wide-angle lens according to the present invention. The ultra-wide-angle lens according to the present invention has a total of ten lenses. Each cemented surface of the cemented lens is recorded as a surface. Together with the aperture stop STO, the protective glass CG, and the image plane IMA, there are a total of 21 surfaces. Among them, the aperture stop STO is set between the fifth lens L5 and the sixth lens L6. For ease of description, the lens surfaces, the aperture stop STO, and the protective glass CG are numbered S1, S2 to S21. The aspheric surface satisfies the following formula:

[0110]

[0111] In the above formula, z is the axial distance from the surface to the vertex at a height y perpendicular to the optical axis along the optical axis; c represents the curvature at the vertex of the aspheric surface; k is the conic coefficient; A4, A6, A8, A 10 、A 12 、A 14 、A 16 ···represent the fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, fourteenth-order, sixteenth-order···aspheric coefficients respectively.

[0112] The data of the four examples are shown in Table 1 below:

[0113] Conditional expression Example 1 Example 2 Example 3 Example 4 -0.3≤D10 / F10<0 -0.22 -0.11 -0.11 -0.11 -6.3≤f1 / f≤-4 -6.28 -4.51 -4.25 -4.60 -4≤f2 / f≤-2.6 -2.83 -3.60 -3.75 -3.85 -1.8≤f12 / f≤-1.6 -1.65 -1.67 -1.65 -1.72 -2.9≤f2 / R22≤-1.6 -2.38 -2.00 -1.81 -2.76 -6.7≤f3 / f≤-3.8 -6.17 -4.66 -5.19 -4.09 2.1≤f4 / f≤7 2.19 4.89 6.75 2.62 0<|f6 / f5|≤1.2 1.02 0.30 0.60 0.87 1.35≤f6 / fb≤3 1.55 1.41 1.91 2.81 -1.67≤f7 / f8≤-0.8 -1.55 -1.57 -1.32 -0.94 2.7≤f9 / f≤5 2.91 3.08 3.06 4.82 0.8≤|R92 / f9|≤2.5 1.12 1.29 0.94 2.07 -5.6≤fa / f≤-3.4 -5.10 -4.32 -4.36 -3.78 2.8≤fb / f≤3.2 3.16 2.86 2.91 2.89 -1.75≤fa / fb≤-1.2 -1.61 -1.51 -1.50 -1.30 -3≤f345 / fa≤-1.3 -1.47 -1.92 -1.96 -2.89 3.4≤FOV / H / D≤3.75 3.68 3.47 3.44 3.44 1.3≤BFL / f≤1.5 1.43 1.36 1.35 1.40 6.9≤TTL*F / H≤7.4 6.99 7.34 7.24 7.09 1≤|Vd4-Vd5|≤15 1.02 13.82 13.74 1.02 40≤|Vd7-Vd8|≤67 43.57 64.47 43.57 43.57

[0114] Table 1

[0115] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the embodiments of the present invention are not limited to the following embodiments.

[0116] Example 1

[0117] Figure 1 This is a schematic structural diagram of the ultra-wide-angle lens of Example 1 of the present invention.

[0118] In Example 1, the tenth lens L10 is a convex-concave lens with negative optical power, the first lens L1 is a convex-concave lens with negative optical power, the second lens L2 is a convex-concave lens with negative optical power, the third lens L3 is a convex-concave lens with negative optical power, the fourth lens L4 is a convex-convex lens with positive optical power, the fifth lens L5 is a convex-convex lens with negative optical power, the sixth lens L6 is a convex-convex lens with positive optical power, the seventh lens L7 is a convex-convex lens with positive optical power, the eighth lens L8 is a convex-concave lens with negative optical power, and the ninth lens L9 is a convex-convex lens with positive optical power.

[0119] The second lens L2, the third lens L3, the sixth lens L6, and the ninth lens L9 are aspherical lenses; a stop STO is located between the fifth lens L5 and the sixth lens L6. The fourth lens L4, the fifth lens L5, the seventh lens L7, and the eighth lens L8 form a cemented lens.

[0120] Table 2 lists the relevant parameters of each lens in the ultra-wide-angle lens of this embodiment, including: surface type, curvature radius R, thickness d, refractive index Nd and Abbe number Vd of the material.

[0121]

[0122]

[0123] Table 2

[0124] Table 3 lists the aspheric coefficients of the aspheric lenses of the ultra-wide-angle lens of this embodiment, including: the quadratic surface constant K, the fourth-order aspheric coefficient A4, the sixth-order aspheric coefficient A6, the eighth-order aspheric coefficient A8, the tenth-order aspheric coefficient A 10 , 12th-order aspheric coefficient A 12 , fourteenth-order aspheric coefficient A 14 and the sixteenth-order aspheric coefficient A 16 .

[0125] Surface number K A4 A6 A8 A10 A12 A14 A16 S5 2.96 2.00E-03 -2.39E-03 3.96E-04 -3.84E-05 2.07E-06 -4.71E-08 0.00E+00 S6 -0.82 1.63E-02 -6.14E-04 -1.93E-03 9.74E-04 -1.90E-04 9.07E-06 2.04E-07 S7 -43.08 8.07E-03 2.59E-03 -1.25E-03 1.33E-04 1.21E-05 -4.86E-06 -4.46E-07 S8 0.00 3.14E-02 -6.69E-03 9.88E-04 5.22E-05 -8.01E-05 8.96E-06 2.94E-07 S13 -7.80 5.91E-03 2.36E-03 -7.27E-04 4.12E-04 -7.66E-05 2.42E-05 -3.77E-06 S14 10.88 6.15E-03 1.87E-04 2.17E-03 -1.08E-03 3.30E-04 -2.19E-05 -1.27E-06 S18 -4.34 9.39E-03 -1.62E-03 4.62E-04 -8.32E-05 9.67E-06 -4.16E-07 -2.20E-09 S19 1.99 1.40E-02 -1.39E-03 5.20E-04 -6.52E-05 2.99E-06 3.18E-07 1.83E-08

[0126] Table 3

[0127] Combine Figure 1 As shown in Tables 1, 2, and 3 above, in Example 1, the total focal length f of the ultra-wide-angle lens is 1.42, the FNO is 1.8, and the relative illumination RI is ≥ 63%.

[0128] The first embodiment of the present invention is an ultra-wide-angle lens having at least one of the following characteristics: a short optical length and good thermal stability; a large field of view FOV ≥ 196°; the ability to achieve high resolution (25 million pixels) when used with a camera; a large aperture (FNO ≤ 1.8); and high illumination (relative illumination ≥ 63%).

[0129] Example 2

[0130] Figure 2 This is a schematic structural diagram of the ultra-wide-angle lens of Example 2 of the present invention.

[0131] In Example 2, the tenth lens L10 is a convexo-concave lens with negative optical power, the first lens L1 is a convexo-concave lens with negative optical power, the second lens L2 is a convexo-concave lens with negative optical power, the third lens L3 is a convexo-concave lens with negative optical power, the fourth lens L4 is a convexo-concave lens with positive optical power, the fifth lens L5 is a convexo-concave lens with positive optical power, the sixth lens L6 is a convexo-convex lens with positive optical power, the seventh lens L7 is a convexo-convex lens with positive optical power, the eighth lens L8 is a convexo-concave lens with negative optical power, and the ninth lens L9 is a convexo-convex lens with positive optical power.

[0132] The fifth lens L5, the sixth lens L6 and the ninth lens L9 are aspherical lenses; the aperture STO is arranged between the fifth lens L5 and the sixth lens L6; the third lens L3, the fourth lens L4, the seventh lens L7 and the eighth lens L8 form a cemented lens.

[0133] Table 4 lists the relevant parameters of each lens in the ultra-wide-angle lens of this embodiment, including: surface type, curvature radius R, thickness d, refractive index Nd and Abbe number Vd of the material.

[0134]

[0135] Table 4

[0136] Table 5 lists the aspheric coefficients of the aspheric lenses of the ultra-wide-angle lens of this embodiment, including: the quadratic surface constant K, the fourth-order aspheric coefficient A4, the sixth-order aspheric coefficient A6, the eighth-order aspheric coefficient A8, the tenth-order aspheric coefficient A 10 , 12th-order aspheric coefficient A 12 , fourteenth-order aspheric coefficient A 14 and the sixteenth-order aspheric coefficient A 16 .

[0137]

[0138] Table 5

[0139] Combine Figure 2 As shown in Tables 1, 4, and 5 above, in Example 2, the total focal length f of the ultra-wide-angle lens is 1.48, the FNO is 1.8, and the relative illumination RI is ≥ 75%.

[0140] The second embodiment of the present invention is an ultra-wide-angle lens having at least one of the following characteristics: a short optical total length and good thermal stability; a large field of view FOV ≥ 196°; the ability to be used with a camera to achieve high resolution (25 million pixels); a large aperture (FNO ≤ 1.8); and high illumination (relative illumination ≥ 63%).

[0141] Example 3

[0142] Figure 3 This is a schematic structural diagram of the ultra-wide-angle lens of Example 3 of the present invention.

[0143] In Example 3, the tenth lens L10 is a convex-concave lens with negative optical power, the first lens L1 is a convex-concave lens with negative optical power, the second lens L2 is a convex-concave lens with negative optical power, the third lens L3 is a convex-concave lens with negative optical power, the fourth lens L4 is a convex-concave lens with positive optical power, the fifth lens L5 is a convex-concave lens with positive optical power, the sixth lens L6 is a convex-convex lens with positive optical power, the seventh lens L7 is a convex-convex lens with positive optical power, the eighth lens L8 is a convex-concave lens with negative optical power, and the ninth lens L9 is a convex-convex lens with positive optical power.

[0144] The second lens L2 and the ninth lens L9 are aspherical lenses; the aperture STO is set between the fifth lens L5 and the sixth lens L6. The third lens L3, the fourth lens L4, the seventh lens L7 and the eighth lens L8 form a cemented lens.

[0145] Table 6 lists the relevant parameters of each lens in the ultra-wide-angle lens of this embodiment, including: surface type, curvature radius R, thickness d, refractive index Nd and Abbe number Vd of the material.

[0146]

[0147]

[0148] Table 6

[0149] Table 7 lists the aspheric coefficients of the aspheric lenses of the ultra-wide-angle lens of this embodiment, including: the quadratic surface constant K, the fourth-order aspheric coefficient A4, the sixth-order aspheric coefficient A6, the eighth-order aspheric coefficient A8, the tenth-order aspheric coefficient A 10 , 12th-order aspheric coefficient A 12 , fourteenth-order aspheric coefficient A 14 and the sixteenth-order aspheric coefficient A 16 .

[0150] Surface number K <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 ]]> <![CDATA[A 12 ]]> <![CDATA[A 14 ]]> <![CDATA[A 16 ]]> S5 0.00 1.30E-02 -2.98E-03 4.46E-04 -3.79E-05 9.70E-07 8.98E-08 -5.27E-09 S6 -0.68 2.27E-02 -4.71E-03 3.09E-03 -2.18E-03 1.02E-03 -2.38E-04 2.24E-05 S18 0.78 -1.23E-02 -7.09E-05 -3.85E-04 2.05E-04 -8.02E-05 1.32E-05 -7.67E-07 S19 -0.33 8.07E-03 -1.99E-03 1.72E-04 1.13E-05 -1.47E-05 2.53E-06 -1.34E-07

[0151] Table 7

[0152] Combine Figure 3 As shown in Tables 1, 6, and 7 above, in Example 3, the total focal length f of the ultra-wide-angle lens is 1.48, the FNO is 1.8, and the relative illumination RI is ≥ 73%.

[0153] The third embodiment of the present invention is an ultra-wide-angle lens having at least one of the following characteristics: a short optical total length and good thermal stability; a large field of view FOV ≥ 196°; the ability to be used with a camera to achieve high resolution (25 million pixels); a large aperture (FNO ≤ 1.8); and high illumination (relative illumination ≥ 63%).

[0154] Example 4

[0155] Figure 4 Schematic diagram of the structure of the ultra-wide-angle lens of Example 4 of the present invention.

[0156] In Example 4, the tenth lens L10 is a convexo-concave lens with negative optical power, the first lens L1 is a convexo-concave lens with negative optical power, the second lens L2 is a convexo-concave lens with negative optical power, the third lens L3 is a convexo-concave lens with negative optical power, the fourth lens L4 is a convexo-convex lens with positive optical power, the fifth lens L5 is a convexo-concave lens with negative optical power, the sixth lens L6 is a convexo-concave lens with positive optical power, the seventh lens L7 is a convexo-convex lens with positive optical power, the eighth lens L8 is a convexo-concave lens with negative optical power, and the ninth lens L9 is a convexo-concave lens with positive optical power.

[0157] The second lens L2, the third lens L3, the sixth lens L6, and the ninth lens L9 are aspherical lenses; a stop STO is located between the fifth lens L5 and the sixth lens L6. The fourth lens L4, the fifth lens L5, the seventh lens L7, and the eighth lens L8 form a cemented lens.

[0158] Table 8 lists the relevant parameters of each lens in the ultra-wide-angle lens of this embodiment, including: surface type, curvature radius R, thickness d, refractive index Nd and Abbe number Vd of the material.

[0159]

[0160] Table 8

[0161] Table 9 lists the aspheric coefficients of the aspheric lenses of the ultra-wide-angle lens of this embodiment, including: the quadratic surface constant K, the fourth-order aspheric coefficient A4, the sixth-order aspheric coefficient A6, the eighth-order aspheric coefficient A8, the tenth-order aspheric coefficient A 10 , 12th-order aspheric coefficient A 12 , fourteenth-order aspheric coefficient A 14 and the sixteenth-order aspheric coefficient A 16 .

[0162]

[0163]

[0164] Table 9

[0165] Combine Figure 4 As shown in Tables 1, 8, and 9 above, in Example 4, the total focal length f of the ultra-wide-angle lens is 1.44, the FNO is 1.8, and the relative illumination RI is ≥80%.

[0166] The fourth embodiment of the present invention is an ultra-wide-angle lens having one of the following characteristics: a short optical total length and good thermal stability, a large field of view FOV ≥ 196°, the ability to be used with a camera to achieve high resolution (25 million pixels), a large aperture (FNO ≤ 1.8), and high illumination (relative illumination ≥ 63%).

[0167] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the utility model disclosed herein is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the concept of the utility model. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An ultra-wide-angle lens, comprising, in order from the object side to the image side along the optical axis: a first lens (L1) with negative optical power, a second lens (L2) with negative optical power, a third lens (L3) with negative optical power, a fourth lens (L4) with positive optical power, a fifth lens (L5), a sixth lens (L6) with positive optical power, a seventh lens (L7) with positive optical power, an eighth lens (L8) with negative optical power, and a ninth lens (L9) with positive optical power, wherein: The first lens (L1) is a convex-concave lens, and the object-side surface of the sixth lens (L6) is convex; The total optical length TTL, the total focal length f, and the image height H at the maximum field of view of the ultra-wide-angle lens satisfy the following relationship: 6.9≤TTL*f / H≤7.

4.

2. The ultra-wide-angle lens according to claim 1, wherein: The invention also includes a tenth lens (L10) located on the object-side surface of the first lens (L1), wherein the tenth lens (L10) has negative optical power.

3. The ultra-wide-angle lens according to claim 2, wherein: The tenth lens (L10) is a convex-concave lens.

4. The ultra-wide-angle lens according to claim 2, wherein: The optical effective aperture D10 of the tenth lens (L10) and the effective focal length f10 of the tenth lens (L10) satisfy the following relationship: -0.3≤D10 / f10<0.

5. The ultra-wide-angle lens according to claim 1, wherein: The second lens (L2) is a convex-concave lens, and the object-side surface of the third lens (L3) is concave.

6. The ultra-wide-angle lens according to claim 1, wherein: The seventh lens (L7) is a convex-convex lens, the object-side surface of the eighth lens (L8) is concave, and the object-side surface of the ninth lens (L9) is convex.

7. The ultra-wide-angle lens according to any one of claims 1 to 6, wherein: The third lens is cemented with the fourth lens, or the fourth lens is cemented with the fifth lens.

8. The ultra-wide-angle lens according to any one of claims 1 to 6, wherein: The seventh lens and the eighth lens form a cemented lens.

9. The ultra-wide-angle lens according to any one of claims 1 to 6, wherein: The effective focal length f1 of the first lens (L1) and the total focal length f of the ultra-wide-angle lens satisfy the following relationship: -6.3≤f1 / f≤-4.

10. The ultra-wide-angle lens according to any one of claims 1 to 6, wherein: The combined effective focal length f12 of the first lens (L1) and the second lens (L2) and the effective focal length f of the ultra-wide-angle lens satisfy the following relationship: -1.8≤f12 / f≤-1.

6.

11. The ultra-wide-angle lens according to any one of claims 1 to 6, wherein: The effective focal length f2 of the second lens (L2) and the total focal length f of the ultra-wide-angle lens satisfy the following relationship: -4≤f2 / f≤-2.

6.

12. The ultra-wide-angle lens according to any one of claims 1 to 6, wherein: The effective focal length f2 of the second lens (L2) and the image side curvature radius R22 of the second lens (L2) satisfy the following relationship: -2.9≤f2 / R22≤-1.

6.

13. The ultra-wide-angle lens according to any one of claims 1 to 6, wherein: The effective focal length f3 of the third lens (L3) and the total focal length f of the ultra-wide-angle lens satisfy the following relationship: -6.7≤f3 / f≤-3.

8.

14. The ultra-wide-angle lens according to any one of claims 1 to 6, wherein: The effective focal length f4 of the fourth lens (L4) and the total focal length f of the ultra-wide-angle lens satisfy the following relationship: 2.1≤f4 / f≤7.

15. The ultra-wide-angle lens according to any one of claims 1 to 6, wherein: The effective focal length f6 of the sixth lens (L6) and the effective focal length f5 of the fifth lens (L5) satisfy the following relationship: 0<|f6 / f5|≤1.

2.

16. The ultra-wide-angle lens according to any one of claims 1 to 6, wherein: The effective focal length f6 of the sixth lens (L6) and the effective focal length fb of the rear lens group satisfy the following relationship: 1.35≤f6 / fb≤3.

17. The ultra-wide-angle lens according to any one of claims 1 to 6, wherein: The effective focal length f7 of the seventh lens (L7) and the effective focal length f8 of the eighth lens (L8) satisfy the following relationship: -1.67≤f7 / f8≤-0.

8.

18. The ultra-wide-angle lens according to any one of claims 1 to 6, wherein: The effective focal length f9 of the ninth lens (L9) and the total focal length f of the ultra-wide-angle lens satisfy the following relationship: 2.7≤f9 / f≤5.

19. The ultra-wide-angle lens according to any one of claims 1 to 6, wherein: The image-side curvature radius R92 of the ninth lens (L9) and the effective focal length f9 of the ninth lens (L9) satisfy the following relationship: 0.8≤|R92 / f9|≤2.

5.

20. The ultra-wide-angle lens according to any one of claims 1 to 6, wherein: The effective focal length fa of the front lens group and the total focal length f of the ultra-wide-angle lens satisfy the following relationship: -5.6≤fa / f≤-3.

4.

21. The ultra-wide-angle lens according to any one of claims 1 to 6, wherein: The effective focal length fb of the rear lens group and the total focal length f of the ultra-wide-angle lens satisfy the following relationship: 2.8≤fb / f≤3.

2.

22. The ultra-wide-angle lens according to any one of claims 1 to 6, wherein: The effective focal length fa of the front lens group and the effective focal length fb of the rear lens group satisfy the following relationship: -1.75≤fa / fb≤-1.

2.

23. The ultra-wide-angle lens according to any one of claims 1 to 6, wherein: The maximum field of view FOV, the image height H at the maximum field of view, and the maximum aperture D of the ultra-wide-angle lens satisfy the following relationship: 3.4≤FOV / H / D≤3.

75.

24. The ultra-wide-angle lens according to any one of claims 1 to 6, wherein: The combined effective focal length f345 of the third lens (L3) to the fifth lens (L5) and the effective focal length fa of the front lens group satisfy the following relationship: -3≤f345 / fa≤-1.

3.

25. The ultra-wide-angle lens according to any one of claims 1 to 4, wherein: The back focal length BFL of the ultra-wide-angle lens and the total focal length f of the ultra-wide-angle lens satisfy the following relationship: 1.3≤BFL / f≤1.

5.

26. The ultra-wide-angle lens according to any one of claims 1 to 6, wherein: The Abbe number Vd4 of the fourth lens (L4) and the Abbe number Vd5 of the fifth lens (L5) satisfy the following relationship: 1≤|Vd4-Vd5|≤15; The Abbe number Vd7 of the seventh lens (L7) and the Abbe number Vd8 of the eighth lens (L8) satisfy the following relationship: 40≤|Vd7-Vd8|≤67.

27. The ultra-wide-angle lens according to any one of claims 1 to 6, wherein: The image height H corresponding to the maximum field angle of the ultra-wide-angle lens is 4.5mm-4.7mm.

28. The ultra-wide-angle lens according to claim 1, wherein: The ultra-wide-angle lens meets at least one of the following conditions: -6.3≤f1 / f≤-4.2, -3.9≤f2 / f≤-2.8, -1.75≤f12 / f≤-1.6, -2.8≤f2 / R22≤-1.8, -6.2≤f3 / f≤-4, 2.15≤f4 / f≤6.8, 0.25≤|f6 / f5|≤1.05, 1.4≤f6 / fb≤2.85, -1.6≤f7 / f8≤-0.9, 2.9≤f9 / f≤4.85, 0.9≤|R92 / f9|≤2.1, -5.15≤fa / f≤-3.75, 2.8≤fb / f≤3.2, -1.65≤fa / fb≤-1.25, -3≤f345 / fa≤-1.4, 3.4≤FOV / H / D≤3.7, 1.3≤BFL / f≤1.45, 6.95≤TTL*F / H≤7.4, 1≤|Vd4-Vd5|≤14, 43.5≤|Vd7-Vd8|≤64.5, Wherein, f1 is the effective focal length of the first lens (L1); f is the total focal length of the ultra-wide-angle lens; f2 is the effective focal length of the second lens (L2); f12 is the combined effective focal length of the first lens (L1) and the second lens (L2); R22 is the radius of curvature of the image side of the second lens (L2); f3 is the effective focal length of the third lens (L3); f4 is the effective focal length of the fourth lens (L4); f6 is the effective focal length of the sixth lens (L6); f5 is the effective focal length of the fifth lens (L5); fb is the effective focal length of the rear lens group; f7 is the effective focal length of the seventh lens (L7); f8 is the effective focal length of the eighth lens (L8); and f9 is the effective focal length of the ninth lens (L9). The effective focal length of the ultra-wide-angle lens is as follows: R92 is the radius of curvature of the image side surface of the ninth lens (L9); fa is the effective focal length of the front lens group; f345 is the combined effective focal length of the third lens (L3) to the fifth lens (L5); FOV is the maximum field of view of the ultra-wide-angle lens; H is the image height at the maximum field of view of the ultra-wide-angle lens; D is the maximum clear aperture of the ultra-wide-angle lens; TTL is the total optical length of the ultra-wide-angle lens; BFL is the back focal length of the ultra-wide-angle lens; Vd4 is the Abbe number of the fourth lens (L4); Vd5 is the Abbe number of the fifth lens (L5); Vd7 is the Abbe number of the seventh lens (L7); and Vd8 is the Abbe number Vd8 of the eighth lens (L8).

29. The ultra-wide-angle lens according to claim 2, wherein: The optical effective aperture D10 of the tenth lens (L10) and the effective focal length f10 of the tenth lens (L10) satisfy the following relationship: -0.3≤D10 / F10≤-0.1.

Images