Wide-angle fixed focus lens

Abstract

The application provides a wide-angle fixed focus lens, and relates to the technical field of optical lenses. The wide-angle fixed focus lens provided by the application comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens arranged in sequence along an optical axis from an object side to an image side; the fourth lens, the fifth lens and the eighth lens have positive refractive powers, and the seventh lens has a negative refractive power; the wide-angle fixed focus lens further comprises a diaphragm, and the diaphragm is located between the fourth lens and the fifth lens. The wide-angle fixed focus lens provided by the application can realize a wide-angle fixed focus lens with a small aperture and high image quality.

Description

Technical Field

[0001] This invention relates to the field of optical lens technology, and more particularly to a wide-angle fixed-focus lens. Background Technology

[0002] With the development of technology, the application range of lenses is becoming increasingly wide, and consequently, people's performance requirements for lenses are also becoming more diverse. Currently, lenses generally suffer from insufficient field of view, often requiring multiple lenses to capture the desired area, which significantly increases production costs. Summary of the Invention

[0003] This invention provides a wide-angle fixed-focus lens to achieve a wide-angle fixed-focus lens with a small aperture and high image quality.

[0004] This invention provides a wide-angle fixed-focus lens, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens arranged sequentially along the optical axis from the object side to the image side;

[0005] The fourth lens, the fifth lens, and the eighth lens have positive optical power, and the seventh lens has negative optical power;

[0006] The wide-angle fixed-focus lens also includes an aperture stop, which is located between the fourth lens and the fifth lens.

[0007] Optionally, the sixth lens and the tenth lens have positive optical power;

[0008] The first lens, the second lens, the third lens, and the ninth lens have negative optical power.

[0009] Optionally, the fourth lens, the fifth lens, the seventh lens, the ninth lens, and the tenth lens are glass aspherical lenses.

[0010] Optionally, the fourth lens is a biconvex lens, the fifth lens is a biconvex lens, and the seventh lens is a biconcave lens;

[0011] The object-side surface of the ninth lens is concave towards the object side, and the image-side surface of the ninth lens is convex towards the image side; the tenth lens is a biconvex lens.

[0012] Optionally, the radius of curvature of the object-side surface of the first lens is L1R1, the radius of curvature of the image-side surface of the first lens is L1R2, the focal length of the first lens is F1, the effective focal length of the wide-angle fixed-focus lens is F, and the refractive index of the first lens is Nd1, satisfying:

[0013] 6.110≤L1R1 / L1R2≤7.533;

[0014] -1.590≤F1 / F≤-1.044;

[0015] 1.80≤Nd1≤1.93.

[0016] Optionally, the focal length of the fifth lens is F5, the Abbe number of the fifth lens is Vd5, and the effective focal length of the wide-angle fixed-focus lens is F, satisfying:

[0017] 1.669≤F5 / F≤2.884;

[0018] 75.00≤Vd5≤96.00.

[0019] Optionally, the maximum lens diameter of the first lens is ΦL1, the total optical length of the wide-angle fixed-focus lens is TTL, the maximum image height of the wide-angle fixed-focus lens is IH, and the radius of curvature of the object-side surface of the first lens is L1R1, satisfying:

[0020] 0.000≤ΦL1 / TTL≤0.074;

[0021] 0.000≤(ΦL1×TTL) / IH≤0.010;

[0022] 15.232≤L1R1 / ΦL1≤90.006.

[0023] Optionally, the total optical length of the wide-angle fixed-focus lens is TTL, the effective focal length of the wide-angle fixed-focus lens is F, and the optical back focal length of the wide-angle fixed-focus lens is BFL, satisfying:

[0024] 0.051≤BFL / TTL≤0.075;

[0025] 0.125≤F / TTL≤0.216.

[0026] Optionally, the focal length of the ninth lens is F9, the focal length of the tenth lens is F10, and the effective focal length of the wide-angle fixed-focus lens is F, satisfying:

[0027] 1.642≤F10 / F≤2.045;

[0028] -2.733≤F9 / F≤-1.391;

[0029] -1.096≤F10 / F9≤-0.705.

[0030] Optionally, the aperture of the wide-angle fixed-focus lens is FNO, and the field of view of the wide-angle fixed-focus lens is FOV, satisfying:

[0031] FNO ≥ 2.85; and / or FOV ≤ 170°.

[0032] In the wide-angle fixed-focus lens provided in this embodiment of the invention, by rationally matching the optical power of the fourth, fifth, seventh, and eighth lenses, a small aperture, a large field of view, and high image quality can be achieved, while also taking into account a large image plane (the imaging target plane can reach 1″). The aperture stop is placed between the fourth lens with positive optical power and the fifth lens with positive optical power, so that the advanced aberrations of the wide-angle fixed-focus lens are controlled at the front end of the wide-angle fixed-focus lens, thereby increasing the light transmission of the wide-angle fixed-focus lens. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of a wide-angle fixed-focus lens provided in Embodiment 1 of the present invention;

[0034] Figure 2 This is a field curvature diagram of a wide-angle fixed-focus lens provided in Embodiment 1 of the present invention;

[0035] Figure 3 The distortion diagram is provided by the wide-angle fixed-focus lens in Embodiment 1 of the present invention;

[0036] Figures 4-9 This is the aperture fan diagram of a wide-angle fixed-focus lens provided in Embodiment 1 of the present invention;

[0037] Figure 10 This is a chromatic aberration diagram of a wide-angle fixed-focus lens provided in Embodiment 1 of the present invention;

[0038] Figure 11 This is an axial aberration diagram of a wide-angle fixed-focus lens provided in Embodiment 1 of the present invention;

[0039] Figure 12 This is a schematic diagram of the structure of the wide-angle fixed-focus lens provided in Embodiment 2 of the present invention;

[0040] Figure 13 This is a field curvature diagram of a wide-angle fixed-focus lens provided in Embodiment 2 of the present invention;

[0041] Figure 14 This is a distortion diagram of a wide-angle fixed-focus lens provided in Embodiment 2 of the present invention;

[0042] Figures 15-20 This is the fan-shaped pattern of the wide-angle fixed-focus lens provided in Embodiment 2 of the present invention;

[0043] Figure 21 This is a chromatic aberration diagram of a wide-angle fixed-focus lens provided in Embodiment 2 of the present invention;

[0044] Figure 22 This is an axial aberration diagram of a wide-angle fixed-focus lens provided in Embodiment 2 of the present invention;

[0045] Figure 23 This is a schematic diagram of the structure of the wide-angle fixed-focus lens provided in Embodiment 3 of the present invention;

[0046] Figure 24 This is a field curvature diagram of a wide-angle fixed-focus lens provided in Embodiment 3 of the present invention;

[0047] Figure 25 This is a distortion diagram of a wide-angle fixed-focus lens provided in Embodiment 3 of the present invention;

[0048] Figures 26-31 This is the fan-shaped pattern of the wide-angle fixed-focus lens provided in Embodiment 3 of the present invention;

[0049] Figure 32 This is a chromatic aberration diagram of a wide-angle fixed-focus lens provided in Embodiment 3 of the present invention;

[0050] Figure 33 This is an axial aberration diagram of a wide-angle fixed-focus lens provided in Embodiment 3 of the present invention. Detailed Implementation

[0051] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0052] Example 1

[0053] Figure 1 This is a schematic diagram of the structure of a wide-angle fixed-focus lens provided in Embodiment 1 of the present invention, with reference to... Figure 1 The wide-angle fixed-focus lens includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a ninth lens L9, and a tenth lens L10 arranged sequentially along the optical axis from the object side to the image side. The fourth lens L4, the fifth lens L5, and the eighth lens L8 have positive optical power, while the seventh lens L7 has negative optical power. The wide-angle fixed-focus lens also includes an aperture stop STO, located between the fourth lens L4 and the fifth lens L5.

[0054] In the wide-angle fixed-focus lens provided in this embodiment of the invention, by rationally matching the optical power of the fourth lens L4, the fifth lens L5, the seventh lens L7, and the eighth lens L8, a small aperture, a large field of view, and high image quality can be achieved, while also taking into account a large image plane (the imaging target plane can reach 1″). The aperture stop STO is placed between the positive optical power fourth lens L4 and the positive optical power fifth lens L5, so that the advanced aberrations of the wide-angle fixed-focus lens are controlled at the front end of the wide-angle fixed-focus lens, thereby increasing the light transmission of the wide-angle fixed-focus lens.

[0055] The wide-angle fixed-focus lens provided in this embodiment of the invention achieves clear imaging in the 436nm to 870nm wavelength band under a 1″ target surface, with a small aperture, higher image quality, and an imaging range of 150° to 170°, which is suitable for the needs of more usage situations.

[0056] Optionally, refer to Figure 1 The sixth lens L6 and the tenth lens L10 have positive optical power; the first lens L1, the second lens L2, the third lens L3 and the ninth lens L9 have negative optical power.

[0057] In wide-angle prime lenses, the lenses are arranged in a negative-negative-negative-positive-positive-positive-negative-positive-negative-positive configuration to rationally distribute the optical power of each lens. This allows light to propagate more smoothly within the wide-angle prime lens, preventing excessive refraction of light on any lens surface. This avoids introducing greater aberrations, ensuring a small aperture and low chromatic aberration while further correcting advanced aberrations and controlling distortion, resulting in higher image quality.

[0058] Optionally, refer to Figure 1 Lens L4, L5, L7, L9, and L10 are glass aspherical lenses. The use of aspherical lenses makes it easier to correct advanced aberrations.

[0059] For example, the first lens L1, the second lens L2, the third lens L3, the sixth lens L6, and the eighth lens L8 are glass spherical lenses. In this embodiment of the invention, a wide-angle fixed-focus lens with a small aperture and high image quality is achieved by combining five glass spherical lenses and five glass aspherical lenses.

[0060] Optionally, refer to Figure 1 The fourth lens L4 is a biconvex lens. Both the object-side and image-side surfaces of the fourth lens L4 and the fourth lens L4 are convex towards the object side. Therefore, the fourth lens L4 is a convex-convex lens. The fifth lens L5 is a biconvex lens. Both the object-side and image-side surfaces of the fifth lens L5 and the fifth lens L5 are convex towards the object side. Therefore, the fifth lens L5 is a convex-convex lens. The seventh lens L7 is a biconcave lens. Both the object-side and image-side surfaces of the seventh lens L7 and the seventh lens L7 are concave towards the object side. Therefore, the seventh lens L7 is a concave-concave lens. The ninth lens L9 has a concave object-side surface and an image-side surface that convex towards the image side. Therefore, the ninth lens L9 is a concave-convex lens. The tenth lens L10 is a biconvex lens. Both the object-side and image-side surfaces of the tenth lens L10 are convex towards the object side. Therefore, the tenth lens L10 is a convex-convex lens.

[0061] For example, the first lens L1 is a convex-concave spherical glass lens; the second lens L2 is a convex-concave spherical glass lens; the third lens L3 is a concave-convex spherical glass lens; the fourth lens L4 is a convex-convex aspherical glass lens; the fifth lens L5 is a convex-convex aspherical glass lens; the sixth lens L6 is a convex-convex spherical glass lens; the seventh lens L7 is a concave-concave aspherical glass lens; the eighth lens L8 is a convex-convex spherical glass lens; the ninth lens L9 is a concave-convex aspherical glass lens; and the tenth lens L10 is a convex-convex aspherical glass lens.

[0062] Optionally, refer to Figure 1 The object-side radius of curvature of the first lens L1 is L1R1, the image-side radius of curvature of the first lens L1 is L1R2, the focal length of the first lens L1 is F1, the effective focal length of the wide-angle fixed-focus lens is F, and the refractive index of the first lens L1 is Nd1, satisfying: 6.110≤L1R1 / L1R2≤7.533; -1.590≤F1 / F≤-1.044; 1.80≤Nd1≤1.93. The first lens L1 has a light-gathering function. By limiting the focal length and refractive index of the first lens L1, the light path of the wide-angle fixed-focus lens can be made smoother, which is conducive to the wide-angle fixed-focus lens to achieve a large field of view imaging. The maximum field of view of the wide-angle fixed-focus lens can reach 170°. In addition, the first lens L1 uses a high refractive index material, which helps to correct advanced chromatic aberration and improves the image quality of the wide-angle fixed-focus lens. It can better focus different colors of light on the same plane, thereby making the color reproduction of the captured image more accurate and the image clearer and sharper.

[0063] Optionally, refer to Figure 1 The fifth lens, L5, has a focal length of F5 and an Abbe number of Vd5. The effective focal length of the wide-angle fixed-focus lens is F, satisfying the following conditions: 1.669 ≤ F5 / F ≤ 2.884; 75.00 ≤ Vd5 ≤ 96.00. This effectively corrects the advanced chromatic aberration of the wide-angle fixed-focus lens, contributing to higher image quality. The fifth lens, L5, is located behind the aperture stop STO. Light enters L5 after passing through STO. As a high Abbe number lens, L5 effectively reduces chromatic aberration. During wide-angle fixed-focus imaging, chromatic aberration can cause color stripes, resulting in a blurry image. The high Abbe number of the fifth lens, L5, can focus different colors of light more precisely at the same point, leading to more accurate color reproduction, improved image quality, and clearer details in the monitored image.

[0064] Optionally, refer to Figure 1The first lens L1 has a maximum lens diameter of ΦL1, the total optical length of the wide-angle fixed-focus lens is TTL, the maximum image height of the wide-angle fixed-focus lens is IH, and the radius of curvature of the object-side surface of the first lens L1 is L1R1, satisfying: 0.000≤ΦL1 / TTL≤0.074; 0.000≤(ΦL1×TTL) / IH≤0.010; 15.232≤L1R1 / ΦL1≤90.006. The first lens L1 can smoothly bring object-side light into the wide-angle fixed-focus lens, which can correct advanced aberrations to a large extent, and also helps the wide-angle fixed-focus lens achieve higher image quality and maintain a smaller size under wide-angle imaging conditions.

[0065] Optionally, refer to Figure 1 The wide-angle fixed-focus lens has an optical total length of TTL, an effective focal length of F, and an optical back focal length of BFL, satisfying the following conditions: 0.051 ≤ BFL / TTL ≤ 0.075; 0.125 ≤ F / TTL ≤ 0.216. This allows for miniaturization while achieving the short back focal length characteristic. It facilitates module assembly and ensures a large image area and high-quality imaging in the wide-angle fixed-focus lens, while also guaranteeing sufficient edge field of view and improved image brightness in the large image area imaging system.

[0066] Optionally, refer to Figure 1 The ninth lens L9 has a focal length of F9, the tenth lens L10 has a focal length of F10, and the effective focal length of the wide-angle prime lens is F, satisfying the following conditions: 1.642≤F10 / F≤2.045; -2.733≤F9 / F≤-1.391; -1.096≤F10 / F9≤-0.705. This corrects the advanced aberrations of the wide-angle prime lens. The tenth lens L10 has positive optical power, and the ninth lens L9 has negative optical power; this combination of positive and negative power compensates for aberrations in the wide-angle prime lens to a certain extent, thus balancing the advanced aberrations and resulting in clearer, more realistic images with more accurate color reproduction.

[0067] Optionally, the aperture of the wide-angle prime lens is FNO, and the field of view (FOV) of the wide-angle prime lens satisfies: FNO ≥ 2.85; and / or, FOV ≤ 170°. Thus, the wide-angle prime lens achieves a small aperture and a large field of view. Aperture represents the diameter of the lens opening; a larger aperture means a larger aperture, allowing more light to enter the lens per unit time. A larger FNO number indicates a smaller aperture.

[0068] For example, refer to Figure 1 The wide-angle fixed-focus lens also includes a flat glass CG, which is located on the side of the tenth lens L10 furthest from the first lens L1. The flat glass CG is located on the image-side surface of the tenth lens L10. The image plane is shown after the flat glass CG.

[0069] Table 1. Design values ​​for a wide-angle fixed-focus lens in Example 1.

[0070] Face number face shape radius of curvature thickness Refractive index Abbe number 1 Standard surface 34.6627 1.4600 1.90 47.55 2 Standard surface 5.2601 2.2319 3 Standard surface 13.5467 0.7542 1.76 88.56 4 aspherical 7.2553 2.9532 5 aspherical -6.8066 0.9506 1.80 37.57 6 Standard surface -13.9856 0.0716 7 aspherical 15.7734 2.9393 1.85 43.84 8 aspherical -8.4111 1.7143 9 Standard surface INF 1.5482 10 STO INF 0.0476 11 aspherical 14.3611 1.4988 1.50 95.23 12 aspherical -10.2946 0.1455 13 Standard surface -226.7515 1.6488 1.50 88.88 14 Standard surface -5.7181 0.0764 15 aspherical -14.5350 0.8701 1.69 29.18 16 aspherical 5.2871 0.7747 17 Standard surface 13.0948 2.7033 1.50 51.68 18 Standard surface -7.9711 0.4540 19 aspherical -4.5610 0.6497 1.67 47.09 20 aspherical -11.8237 3.5298 21 aspherical 8.6917 3.3562 1.73 95.10 22 aspherical -29.4736 0.5489 23 Standard surface INF 0.6000 1.52 64.17 24 Standard surface INF 0.7525 25 IMX INF -

[0071] Table 1 shows one design value for the wide-angle fixed-focus lens in Embodiment 1. The specific values ​​can be adjusted according to product requirements and are not intended to limit the embodiments of the present invention. The wide-angle fixed-focus lens shown in Table 1 can be... Figure 1 As shown in the table. A lens generally consists of two surfaces, each of which is a refractive surface. The surface numbers in Table 1 are assigned according to the surfaces of each lens. Surface number 1 represents the front surface (object side) of the first lens L1, surface number 2 represents the rear surface (image side) of the first lens L1, and so on; further details are omitted here. The virtual surface corresponding to surface number 9 is... Figure 1 The diagram shows the vertical line between the fourth lens L4 and the aperture stop STO. STO in the "Surface Type" column represents the aperture stop. IMX in the "Surface Type" column represents the image plane. The radius of curvature represents the curvature of the lens surface; a positive radius of curvature value indicates the center of curvature is closer to the image side of the surface, meaning the surface bends towards the image; a negative radius of curvature value indicates the center of curvature is farther from the image side of the surface, meaning the surface bends towards the object plane. INF in the "Radius of Curvature" column indicates that the surface is flat with an infinite radius of curvature. The value in the "Thickness" column represents the central axial distance between the current surface and the next surface. The "Refractive Index" column represents the refractive index of the medium between the current and next surfaces, representing the material's ability to deflect light. A blank space in the "Refractive Index" column represents the refractive index of air, which is 1. The Abbe number represents the dispersion characteristics of the material between the current and next surfaces; a blank space indicates the current location is air.

[0072] Table 2 shows a design value for the aspheric coefficient of the lens in the wide-angle fixed-focus lens in Example 1.

[0073] Face number K a4 a6 a8 a10 7 -6.8948 -2.146397E-04 -8.412506E-06 4.822056E-07 -2.538298E-09 8 0.0827 5.045574E-04 -1.271486E-05 6.223030E-07 -1.254742E-08 11 -1.5164 2.704484E-03 -7.171441E-04 6.289515E-04 -3.726218E-04 12 8.2872 3.994132E-03 -3.400475E-04 3.944555E-05 -3.903591E-05 15 8.8206 -3.435467E-03 -5.732754E-04 7.568240E-05 -2.718095E-05 16 0.0508 -3.224558E-03 -2.063146E-04 1.336924E-05 7.076333E-06 19 -0.0003 -4.046673E-03 1.203531E-03 -5.354413E-05 -8.399497E-06 20 3.1551 -6.526234E-03 9.985812E-04 -6.920478E-05 2.121299E-06 21 -1.0491 -2.416804E-04 -1.660149E-04 1.305389E-05 -6.613111E-07 22 -16.0244 5.223425E-03 -6.765157E-04 4.337212E-05 -1.812052E-06 Face number a12 a14 a16 a18 a20 7 -7.085029E-10 4.855063E-11 -1.319226E-12 0.000000E+00 0.000000E+00 8 -4.167445E-10 3.987169E-11 -1.018010E-12 0.000000E+00 0.000000E+00 11 1.351657E-04 -3.112449E-05 4.392356E-06 -3.477237E-07 1.184528E-08 12 1.709966E-05 -4.402407E-06 6.450106E-07 -5.057379E-08 1.649219E-09 15 6.977788E-06 -1.271752E-06 1.480443E-07 -1.027577E-08 3.563771E-10 16 -2.430677E-06 3.809931E-07 -3.358463E-08 1.605139E-09 -3.227007E-11 19 2.021414E-06 -2.054082E-07 1.166278E-08 -3.590969E-10 4.708066E-12 20 1.488595E-07 -2.137726E-08 1.105458E-09 -2.819284E-11 2.966446E-13 21 2.368161E-08 -5.629128E-10 8.310670E-12 -6.881180E-14 2.433893E-16 22 5.193062E-08 -9.988270E-10 1.222288E-11 -8.572370E-14 2.617965E-16

[0074] Table 2 shows a design value for the aspherical coefficient of the lens in the wide-angle fixed-focus lens of Embodiment 1. The specific value can be adjusted according to product requirements and is not intended to limit the embodiments of this invention. The wide-angle fixed-focus lens shown in Table 2 can be... Figure 1 As shown in the table. The meaning of the face number column in Table 2 is consistent with that in Table 1. In the embodiments of the present invention, "E" represents an exponent with a base of 10.

[0075] Optionally, the surface of the aspherical lens satisfies the formula:

[0076]

[0077] Where z is the axial sagitta in the Z-direction of the aspherical surface; r is the height of the aspherical surface; c is the curvature of the fitted sphere, numerically the reciprocal of the radius of curvature; k is the fitted conic coefficient; a4 to a 20 For the 4th, 6th, 8th, 10th, 12th, 14th, 16th, 18th and 20th order coefficients of the aspherical polynomial.

[0078] For example, in Embodiment 1, the maximum achievable diameter of the image plane is 16.2 mm, the field of view is 165.4°, the aperture is 5.00, and the f / # is 2.80. The TTL is 32.280 mm, and the applicable wavelength range includes 436 nm to 870 nm.

[0079] For example, in Embodiment 1, L1R1 / L1R2 = 6.590, F1 / F = -1.408, F5 / F = 2.453, ΦL1 / TTL = 0.045, (ΦL1×TTL) / IH = 0.003, L1R1 / ΦL1 = 23.742, BFL / TTL = 0.059, F / TTL = 0.155, F10 / F = 1.911, F9 / F = -2.286, F10 / F9 = -0.836.

[0080] Figure 2 The field curvature diagram of the wide-angle fixed-focus lens provided in Embodiment 1 of the present invention is shown in the reference diagram. Figure 2 The horizontal coordinate represents the magnitude of the field curvature, in mm; the vertical coordinate represents the normalized image height, which has no unit; where T represents meridion and S represents arc loss. Figure 2 As can be seen, the wide-angle fixed-focus lens provided in this embodiment effectively controls field curvature, that is, during imaging, the difference between the image quality in the center and the image quality at the periphery is small.

[0081] Figure 3 The distortion diagram of the wide-angle fixed-focus lens provided in Embodiment 1 of the present invention is shown below. Figure 3 The horizontal coordinate represents the magnitude of distortion, expressed as a percentage; the vertical coordinate represents the normalized image height, which has no unit.

[0082] Figures 4-9 The aperture fan diagram of the wide-angle fixed-focus lens provided in Embodiment 1 of the present invention is shown in the reference diagram. Figures 4-9 The fan plot is one of the most commonly used evaluation methods in modern optical design. The horizontal axis represents the beam aperture, and the vertical axis represents the transverse aberration. Ideally, the fan plot is a straight line coinciding with the horizontal axis, indicating that all rays converge at the same point on the image plane. The interval on the vertical axis corresponding to this line represents the maximum dispersion range of the beam on the ideal image plane. The fan plot can reflect not only monochromatic aberrations of different wavelengths but also the magnitude of transverse chromatic aberration. Figures 4-9It can be seen that the wide-angle fixed-focus lens closely matches the horizontal axis at each wavelength in each field of view, indicating that the transverse aberration of each wavelength in the system is well corrected. At the same time, there is no obvious dispersion of each wavelength, indicating that the chromatic aberration of the wide-angle fixed-focus lens is also well corrected, thus ensuring that the wide-angle fixed-focus lens can achieve high-resolution imaging requirements.

[0083] Figure 10 The transverse chromatic aberration diagram of the wide-angle fixed-focus lens provided in Embodiment 1 of the present invention is shown below. Figure 10 The vertical direction represents the normalization of the field of view, with 0 indicating the optical axis; the dominant wavelength is 546 nm, and the horizontal direction represents the offset relative to the dominant wavelength, in micrometers (µm). Figure 10 It can be seen that the transverse chromatic aberration of different wavelengths is controlled within a good range, indicating that the transverse chromatic aberration of this wide-angle fixed-focus lens is well controlled and can meet the requirements of wide-spectrum applications.

[0084] Figure 11 The axial aberration diagram of the wide-angle fixed-focus lens provided in Embodiment 1 of the present invention is shown below. Figure 11 The vertical direction represents the normalized aperture, 0 indicates it is on the optical axis, and the vertex in the perpendicular direction represents the maximum pupil radius; the dominant wavelength is 546nm, and the horizontal direction represents the offset relative to the dominant wavelength, in millimeters (mm). Figure 11 It can be seen that the axial aberrations of different wavelengths (0-1.0 normalized aperture) are all controlled within a reasonable range, indicating that the transverse chromatic aberration of this wide-angle fixed-focus lens is well controlled.

[0085] Example 2

[0086] Similarities to the above embodiments will not be repeated here.

[0087] Table 3 shows a design value for a wide-angle fixed-focus lens in Example 2.

[0088] Face number face shape radius of curvature thickness Refractive index Abbe number 1 Standard surface 35.2641 1.1596 1.87 39.74 2 Standard surface 5.3559 1.8999 3 Standard surface 12.5350 0.6093 1.74 77.11 4 aspherical 7.2901 2.8748 5 aspherical -6.7805 0.9360 1.81 31.43 6 Standard surface -13.9309 0.0581 7 aspherical 15.6919 2.8714 1.85 41.13 8 aspherical -8.4320 1.7549 9 Standard surface INF 1.5999 10 STO INF 0.0609 11 aspherical 14.4813 1.6616 1.50 85.55 12 aspherical -10.2620 0.1394 13 Standard surface -215.3604 1.6604 1.50 72.71 14 Standard surface -5.7299 0.0761 15 aspherical -14.3737 0.8655 1.69 30.86 16 aspherical 5.2894 0.8555 17 Standard surface 13.0496 2.9029 1.49 77.79 18 Standard surface -8.1962 0.4740 19 aspherical -4.5745 0.6369 1.69 37.66 20 aspherical -12.0294 3.6401 21 aspherical 7.8747 3.4090 1.58 75.55 22 aspherical -25.1586 0.6168 23 Standard surface INF 0.7500 1.52 64.17 24 Standard surface INF 0.7778 25 IMX INF -

[0089] Table 3 shows one design value for the wide-angle fixed-focus lens in Embodiment 2. The specific values ​​can be adjusted according to product requirements and are not intended to limit the embodiments of the present invention. The wide-angle fixed-focus lens shown in Table 3 can be... Figure 12 As shown in the image.

[0090] Table 4 shows a design value for the aspheric coefficient of the lens in the wide-angle fixed-focus lens in Example 2.

[0091] Face number K a4 a6 a8 a10 7 -6.7077 -2.163006E-04 -8.339328E-06 4.725313E-07 -2.929993E-09 8 0.0832 5.041704E-04 -1.293302E-05 6.255390E-07 -1.244923E-08 11 -1.1601 2.721663E-03 -7.106030E-04 6.301740E-04 -3.724503E-04 12 8.3136 3.968997E-03 -3.372762E-04 4.116508E-05 -3.860944E-05 15 9.0451 -3.485622E-03 -5.764125E-04 7.612945E-05 -2.713049E-05 16 0.0489 -3.223790E-03 -2.079361E-04 1.330341E-05 7.081761E-06 19 -0.0010 -4.078152E-03 1.205940E-03 -5.345454E-05 -8.397090E-06 20 3.1428 -6.476052E-03 9.976275E-04 -6.923327E-05 2.121106E-06 21 -1.2481 -3.126272E-04 -1.644567E-04 1.305733E-05 -6.614045E-07 22 -42.8409 5.280790E-03 -6.811655E-04 4.336167E-05 -1.811851E-06 Face number a12 a14 a16 a18 a20 7 -7.129542E-10 5.085645E-11 -1.090182E-12 0.000000E+00 0.000000E+00 8 -3.987954E-10 4.126447E-11 -8.925126E-13 0.000000E+00 0.000000E+00 11 1.351980E-04 -3.111890E-05 4.393640E-06 -3.476380E-07 1.178009E-08 12 1.715588E-05 -4.399857E-06 6.440035E-07 -5.076588E-08 1.676487E-09 15 6.976423E-06 -1.272908E-06 1.478075E-07 -1.027793E-08 3.649147E-10 16 -2.429318E-06 3.810974E-07 -3.358367E-08 1.604872E-09 -3.194005E-11 19 2.021475E-06 -2.054018E-07 1.166337E-08 -3.590649E-10 4.708922E-12 20 1.488781E-07 -2.137652E-08 1.105479E-09 -2.819028E-11 2.969386E-13 21 2.368041E-08 -5.629144E-10 8.311054E-12 -6.879708E-14 2.438018E-16 22 5.193413E-08 -9.987898E-10 1.222319E-11 -8.572385E-14 2.617128E-16

[0092] Table 4 shows a design value for the aspherical coefficient of the lens in the wide-angle fixed-focus lens of Example 2. The specific value can be adjusted according to product requirements and is not intended to limit the embodiments of this invention. The fixed-focus lens shown in Table 4 can be... Figure 12 As shown in the image.

[0093] For example, in Embodiment 2, the maximum achievable diameter of the image plane is 16.8 mm, the field of view is 153.9°, the aperture is 5.98, and the f / # is 2.80. The TTL is 32.291 mm, and the applicable wavelength range includes 436 nm to 870 nm.

[0094] For example, in Embodiment 2, L1R1 / L1R2 = 6.584, F1 / F = -1.226, F5 / F = 2.061, ΦL1 / TTL = 0.036, (ΦL1×TTL) / IH = 0.002, L1R1 / ΦL1 = 30.411, BFL / TTL = 0.066, F / TTL = 0.185, F10 / F = 1.776, F9 / F = -1.839, F10 / F9 = -0.966.

[0095] Example 3

[0096] Similarities to the above embodiments will not be repeated here.

[0097] Table 5 shows a design value for a wide-angle fixed-focus lens in Example 3.

[0098] Face number face shape radius of curvature thickness Refractive index Abbe number 1 Standard surface 38.0985 0.5228 1.88 67.21 2 Standard surface 5.3975 1.9174 3 Standard surface 12.5944 0.5534 1.74 75.66 4 aspherical 7.2321 2.8862 5 aspherical -6.8247 0.9372 1.80 38.55 6 Standard surface -14.0539 0.0536 7 aspherical 15.6958 2.8169 1.85 49.30 8 aspherical -8.4294 1.6978 9 Standard surface INF 1.5428 10 STO INF 0.0695 11 aspherical 14.4457 1.5988 1.50 89.44 12 aspherical -10.2604 0.1414 13 Standard surface -237.4167 1.6450 1.50 73.24 14 Standard surface -5.7401 0.0744 15 aspherical -14.4684 0.8672 1.69 28.95 16 aspherical 5.2823 0.8510 17 Standard surface 13.0065 2.8068 1.50 40.96 18 Standard surface -8.2090 0.4810 19 aspherical -4.5692 0.6221 1.67 45.92 20 aspherical -11.9468 3.6103 21 aspherical 8.0810 3.4161 1.60 75.66 22 aspherical -22.5737 0.6056 23 Standard surface INF 0.7000 1.52 64.17 24 Standard surface INF 0.7888 25 IMX INF -

[0099] Table 5 shows one design value for the wide-angle fixed-focus lens in Embodiment 3. The specific values ​​can be adjusted according to product requirements and are not intended to limit the embodiments of the present invention. The wide-angle fixed-focus lens shown in Table 5 can be... Figure 23 As shown in the image.

[0100] Table 6 shows a design value for the aspheric coefficient of the lens in the wide-angle fixed-focus lens in Example 3.

[0101] Face number K a4 a6 a8 a10 7 -6.9612 -2.237310E-04 -8.236342E-06 4.841855E-07 -2.677511E-09 8 0.0694 5.078711E-04 -1.281532E-05 6.293274E-07 -1.271191E-08 11 -0.8163 2.738922E-03 -7.130851E-04 6.299549E-04 -3.724663E-04 12 8.3604 3.951021E-03 -3.365884E-04 4.073789E-05 -3.876954E-05 15 9.1391 -3.478720E-03 -5.787139E-04 7.624173E-05 -2.714558E-05 16 0.0535 -3.219606E-03 -2.063049E-04 1.345414E-05 7.091544E-06 19 0.0003 -4.063379E-03 1.205611E-03 -5.345839E-05 -8.397590E-06 20 3.1500 -6.479813E-03 9.980006E-04 -6.923082E-05 2.121117E-06 21 -1.5281 -3.212612E-04 -1.641526E-04 1.306437E-05 -6.613370E-07 22 -1.4622 5.460094E-03 -6.800418E-04 4.335725E-05 -1.811909E-06 Face number a12 a14 a16 a18 a20 7 -7.258604E-10 4.938004E-11 -1.148241E-12 0.000000E+00 0.000000E+00 8 -3.966372E-10 4.115760E-11 -9.671164E-13 0.000000E+00 0.000000E+00 11 1.351929E-04 -3.112041E-05 4.393273E-06 -3.476849E-07 1.178723E-08 12 1.713124E-05 -4.401638E-06 6.444141E-07 -5.070295E-08 1.668587E-09 15 6.968314E-06 -1.274432E-06 1.476219E-07 -1.026612E-08 3.765472E-10 16 -2.429973E-06 3.808892E-07 -3.361163E-08 1.604267E-09 -3.149490E-11 19 2.021421E-06 -2.054050E-07 1.166328E-08 -3.590642E-10 4.709364E-12 20 1.488721E-07 -2.137614E-08 1.105455E-09 -2.819158E-11 2.967478E-13 21 2.368060E-08 -5.629225E-10 8.310858E-12 -6.880009E-14 2.437609E-16 22 5.193369E-08 -9.987862E-10 1.222326E-11 -8.572257E-14 2.617185E-16

[0102] Table 6 shows a design value for the aspherical coefficient of the lens in the wide-angle fixed-focus lens of Embodiment 3. The specific value can be adjusted according to product requirements and is not intended to limit the embodiments of the present invention. The fixed-focus lens shown in Table 6 can be... Figure 23 As shown in the image.

[0103] For example, in Embodiment 3, the maximum achievable diameter of the image plane is 16.6 mm, the field of view is 154.9°, the aperture is 5.70, and the f / # is 2.80. The TTL is 31.206 mm, and the applicable wavelength range includes 436 nm to 870 nm.

[0104] For example, in Embodiment 3, L1R1 / L1R2 = 7.059, F1 / F = -1.264, F5 / F = 2.157, ΦL1 / TTL = 0.017, (ΦL1×TTL) / IH = 0.001, L1R1 / ΦL1 = 72.874, BFL / TTL = 0.067, F / TTL = 0.067, F10 / F = 1.813, F9 / F = -1.981, F10 / F9 = -0.915.

[0105] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A wide-angle fixed-lens, characterized by comprising: The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens and the tenth lens are arranged in sequence along the optical axis from the object side to the image side; The fourth lens, the fifth lens and the eighth lens have positive refractive powers, and the seventh lens has a negative refractive power; The sixth lens and the tenth lens have positive refractive powers; The first lens, the second lens, the third lens and the ninth lens have negative refractive powers; the wide-angle fixed-focus lens has 10 lenses with refractive powers; wherein the fifth lens is a double-convex lens, the object side of the ninth lens is recessed towards the object side, and the image side of the ninth lens is convex towards the image side; The tenth lens is a double-convex lens; The wide-angle fixed-focus lens further comprises a diaphragm, and the diaphragm is located between the fourth lens and the fifth lens; The radius of curvature of the object side of the first lens is L1R1, the radius of curvature of the image side of the first lens is L1R2, the focal length of the first lens is F1, the effective focal length of the wide-angle fixed-focus lens is F, the refractive index of the first lens is Nd1, and the following conditions are met: ； ； ； The focal length of the fifth lens is F5, and the Abbe number of the fifth lens is Vd5, and the following conditions are met: ； ； The optical total length of the wide-angle fixed-focus lens is TTL, and the optical back focal length of the wide-angle fixed-focus lens is BFL, and the following conditions are met: ； ； The focal length of the ninth lens is F9, and the focal length of the tenth lens is F10, and the following conditions are met: ； ； 。 2. The wide-angle prime lens according to claim 1, characterized in that The fourth lens, the fifth lens, the seventh lens, the ninth lens and the tenth lens are glass aspherical lenses.

3. The wide-angle prime lens according to claim 2, characterized in that The fourth lens is a double-convex lens, and the seventh lens is a double-concave lens.

4. The wide-angle prime lens according to claim 1, characterized in that, The maximum lens diameter of the first lens is ΦL1, and the following conditions are met: ； 。 5. The wide-angle prime lens according to claim 1, characterized in that, The field of view angle of the wide-angle fixed-focus lens is FOV, and the following conditions are met: 。

Images