A fixed-focus lens

Abstract

This invention discloses a fixed-focus lens. The fixed-focus lens includes a first lens to a tenth lens arranged sequentially along the optical axis from the object side to the image side; the first lens is a glass lens with negative optical power, the second lens is a plastic lens, the third lens is a plastic lens or a glass lens, the fourth lens is a glass lens or a plastic lens, the fifth lens is a glass lens or a plastic lens with positive optical power, the sixth lens is a glass lens or a plastic lens with positive optical power, the seventh lens is a glass lens with negative optical power, the eighth lens is a glass lens with positive optical power, the ninth lens is a plastic lens, and the tenth lens is a plastic lens, with five glass lenses and five plastic lenses. The fixed-focus lens provided by this invention adopts a 5G5P optical system structure and, by optimizing the shape, optical power, and relative position of each lens, meets the requirements of a large aperture, ultra-wide angle, infrared confocal focus, and short overall length.

Description

Technical Field

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

[0002] With the advancement of technology and the development of 5G (fifth-generation mobile communication), various industries have placed higher demands on lens performance in all aspects. Since small apertures cannot meet the needs of low-light shooting environments, large apertures have become a trend in photographic lens products. Currently, a series of large aperture products have appeared on the market, but lenses that simultaneously satisfy the requirements of large aperture, infrared confocal focus, and ultra-wide-angle are very rare. Summary of the Invention

[0003] This invention provides a fixed-focus lens with an optical system structure consisting of 5 glass lenses and 5 plastic lenses (5G5P). By optimizing the shape, power, and relative position of each lens, a lens design with a large aperture, ultra-wide angle, infrared confocal focus, and short overall length is achieved. The fixed-focus lens has an aperture of 1.08 to 1.15, an optical length of less than or equal to 22.5 mm, and a maximum field of view of 151.9°, meeting the requirements of a large aperture, ultra-wide angle, infrared confocal focus, and short overall length.

[0004] According to one aspect of the present invention, a fixed-focus lens is provided, 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 first lens is a glass lens with negative optical power, the second lens is a plastic lens, the third lens is a plastic lens or a glass lens, the fourth lens is a glass lens or a plastic lens, the fifth lens is a glass lens or a plastic lens with positive optical power, the sixth lens is a glass lens or a plastic lens with positive optical power, the seventh lens is a glass lens with negative optical power, the eighth lens is a glass lens with positive optical power, the ninth lens is a plastic lens, the tenth lens is a plastic lens, and the number of glass lenses and plastic lenses is five.

[0006] Optionally, all glass lenses are spherical lenses, and all plastic lenses are aspherical lenses.

[0007] Optionally, the first lens and the second lens satisfy the following:

[0008] -0.561≤Φ1 / Φ≤-0.450;

[0009] -0.158≤Φ2 / Φ≤0.037;

[0010] 34.00 <Vd1<43.00;

[0011] Wherein, Φ1 represents the optical power of the first lens, Φ2 represents the optical power of the second lens, Φ represents the overall optical power of the fixed-focus lens, and Vd1 represents the Abbe number of the first lens.

[0012] Optionally, the first lens is a convex-concave glass spherical lens, and the second lens is a concave-convex plastic aspherical lens.

[0013] Optionally, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens satisfy the following:

[0014] -0.038≤Φ3 / Φ≤0.296;

[0015] -0.158≤Φ4 / Φ≤0.333;

[0016] 0.128≤Φ5 / Φ≤0.271;

[0017] 0.143≤Φ6 / Φ≤0.525;

[0018] -0.970≤Φ7 / Φ≤-0.523;

[0019] 0.578≤Φ8 / Φ≤0.771;

[0020] 16.08≤Vd3≤67.71;

[0021] 1.4974≤Nd4≤1.9484;

[0022] 20.28≤Vd4≤58.93;

[0023] 1.5906≤Nd5≤1.9399;

[0024] 16.08≤Vd5≤67.70;

[0025] 3.12≤Vd8-Vd6≤52.32;

[0026] 25.07≤Vd7≤29.9;

[0027] Wherein, Φ3, Φ4, Φ5, Φ6, Φ7, and Φ8 represent the optical power of the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens, respectively; Φ represents the overall optical power of the fixed-focus lens; Vd3, Nd4, Vd4, Nd5, Vd5, Vd8-Vd6, and Vd7 represent the Abbe number of the third lens, the refractive index of the fourth lens, the Abbe number of the fourth lens, the refractive index of the fifth lens, the Abbe number of the fifth lens, the Abbe number of the eighth lens minus the Abbe number of the sixth lens, and the Abbe number of the seventh lens, respectively.

[0028] Optionally, the third lens is a plastic aspherical lens or a glass spherical lens with a convex object-side surface; the fourth lens is a glass spherical lens or a plastic aspherical lens with a convex image-side surface; the fifth lens is a biconvex glass spherical lens or a plastic aspherical lens; the sixth lens is a biconvex glass spherical lens or a plastic aspherical lens; the seventh lens is a glass spherical lens with a concave image-side surface; and the eighth lens is a biconvex glass spherical lens.

[0029] Optionally, the optical power of the ninth lens and the tenth lens satisfies:

[0030] -0.919≤Φ9 / Φ≤0.332;

[0031] -0.194≤Φ10 / Φ≤0.639;

[0032] Wherein, Φ9 represents the optical angle of the ninth lens, Φ10 represents the optical power of the tenth lens, and Φ represents the overall optical power of the fixed-focus lens.

[0033] Optionally, the ninth lens is a plastic aspherical lens, and the tenth lens is a plastic aspherical lens.

[0034] Optionally, the aperture number of the fixed-focus lens is in the range of 1.08 to 1.15, and the total optical length of the fixed-focus lens is less than or equal to 22.5 mm.

[0035] Optionally, a filter may also be included, which is located between the tenth lens and the image plane.

[0036] The fixed-focus lens provided in this invention includes 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. The first lens is a glass lens with negative optical power, and the second lens is a plastic lens, which is beneficial for achieving ultra-wide-angle performance. The third lens is either a plastic lens or a glass lens, the fourth lens is either a glass lens or a plastic lens, the fifth lens is either a glass lens or a plastic lens with positive optical power, the sixth lens is either a glass lens or a plastic lens with positive optical power, the seventh lens is a glass lens with negative optical power, and the eighth lens is a glass lens with positive optical power. The third to eighth lenses can reduce the need for advanced lenses. The introduction of spherical aberration corrects chromatic aberration, which is beneficial for achieving a large aperture, infrared confocal focal length, and short overall length. The ninth and tenth lenses are plastic lenses, which can reduce the angle of light reaching the image plane, ensuring high relative illumination of the image and facilitating aberration correction to ensure resolution. There are five glass lenses and five plastic lenses, adopting a 5G5P optical system structure. By optimizing the shape, optical power, and relative position of each lens, a lens design with a large aperture, ultra-wide angle, infrared confocal focal length, and short overall length is finally achieved. The fixed-focus lens has an aperture of 1.08 to 1.15, an optical length of less than or equal to 22.5 mm, and a maximum field of view of 151.9°, meeting the requirements of a large aperture, ultra-wide angle, infrared confocal focal length, and short overall length.

[0037] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the structure of a fixed-focus lens provided in an embodiment of the present invention;

[0040] Figure 2 This is a schematic diagram of the axial aberration curve for Example 1;

[0041] Figure 3 This is a schematic diagram of another fixed-focus lens provided in an embodiment of the present invention;

[0042] Figure 4 This is a schematic diagram of the axial aberration curve for Example 2;

[0043] Figure 5 This is a schematic diagram of the structure of another fixed-focus lens provided in an embodiment of the present invention;

[0044] Figure 6 This is a schematic diagram of the axial aberration curve for Example 3;

[0045] Figure 7 This is a schematic diagram of the structure of another fixed-focus lens provided in an embodiment of the present invention;

[0046] Figure 8 This is a schematic diagram of the axial aberration curve for Example 4. Detailed Implementation

[0047] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0048] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0049] Figure 1 This is a schematic diagram of a fixed-focus lens provided in an embodiment of the present invention, with reference to... Figure 1The fixed-focus lens includes a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, a fifth lens 50, a sixth lens 60, a seventh lens 70, an eighth lens 80, a ninth lens 90, and a tenth lens 100 arranged sequentially along the optical axis from the object side to the image side. Specifically, the first lens 10 is a glass lens with negative optical power, the second lens 20 is a plastic lens, the third lens 30 is either a plastic or glass lens, the fourth lens 40 is either a glass or plastic lens, the fifth lens 50 is either a glass or plastic lens with positive optical power, the sixth lens 60 is either a glass or plastic lens with positive optical power, the seventh lens 70 is a glass lens with negative optical power, the eighth lens 80 is a glass lens with positive optical power, the ninth lens 90 is a plastic lens, and the tenth lens 100 is a plastic lens. The number of both glass and plastic lenses is five.

[0050] It is understandable that optical power, the reciprocal of focal length, characterizes the ability of an optical system to deflect light. The larger the absolute value of optical power, the stronger the ability to bend light; the smaller the absolute value, the weaker the ability to bend light. When optical power is positive, the refraction of light is converging; when optical power is negative, the refraction of light is diverging. Optionally, all glass lenses are spherical lenses, and all plastic lenses are aspherical lenses. Glass lenses are easier to process and have better thermal stability, while plastic lenses are lower in cost, and plastic aspherical lenses offer better aberration correction. Designing a hybrid glass-plastic structure can provide mutual compensation. Using a combination of glass and plastic lenses in a fixed-focus lens can better balance lens resolution and improve image quality. By combining the first lens 10 and the second lens 20 with a negative light angle, more light is ensured to enter the fixed-focus lens, which is beneficial for achieving the ultra-wide-angle capability of the system. By combining the optical power of the third lens 30, the fourth lens 40, the fifth lens 50, the sixth lens 60, the seventh lens 70, and the eighth lens 80, the amount of advanced spherical aberration introduced can be reduced, chromatic aberration can be corrected, and it is beneficial for achieving a large aperture, infrared confocal focus, and a short overall length. By setting the ninth lens 90 and the tenth lens 100 to be plastic lenses, the angle of light reaching the image plane is reduced, ensuring a relatively high illumination of the image and facilitating aberration correction, thus ensuring resolution. Through the rational design of the shape, optical power, and relative position of each lens, an aperture of 1.08 to 1.15, an optical length of less than or equal to 22.5 mm, and a maximum field of view of 151.9° are finally achieved, meeting the requirements of a large aperture, ultra-wide-angle, infrared confocal focus, and short overall length.

[0051] Optionally, a prime lens may also include an aperture stop, which is located on the object-side surface of a lens and can be used to block off-axis rays, better correct advanced aberrations, and improve image quality.

[0052] Optional, continue to refer to Figure 1The fixed-focus lens also includes a filter 110, which is located between the tenth lens 100 and the image plane.

[0053] The filter 110 can filter out light rays outside the imaging wavelength range, thereby improving image quality. In specific implementations, the filtering wavelength of the filter 110 can be designed according to actual conditions.

[0054] Optionally, the first lens 10 and the second lens 20 satisfy the following:

[0055] -0.561≤Φ1 / Φ≤-0.450;

[0056] -0.158≤Φ2 / Φ≤0.037;

[0057] 34.00 <Vd1<43.00;

[0058] Wherein, Φ1 represents the optical power of the first lens 10, Φ2 represents the optical power of the second lens 20, Φ represents the overall optical power of the fixed-focus lens, and Vd1 represents the Abbe number of the first lens 10.

[0059] Optionally, the first lens 10 is a convex-concave glass spherical lens, and the second lens 20 is a concave-convex plastic aspherical lens.

[0060] By setting the first lens 10 and the second lens 20 to meet the above conditions, it is beneficial to realize the ultra-wide-angle of the system.

[0061] Optionally, the third lens 30, the fourth lens 40, the fifth lens 50, the sixth lens 60, the seventh lens 70, and the eighth lens 80 satisfy the following:

[0062] -0.038≤Φ3 / Φ≤0.296;

[0063] -0.158≤Φ4 / Φ≤0.333;

[0064] 0.128≤Φ5 / Φ≤0.271;

[0065] 0.143≤Φ6 / Φ≤0.525;

[0066] -0.970≤Φ7 / Φ≤-0.523;

[0067] 0.578≤Φ8 / Φ≤0.771;

[0068] 16.08≤Vd3≤67.71;

[0069] 1.4974≤Nd4≤1.9484;

[0070] 20.28≤Vd4≤58.93;

[0071] 1.5906≤Nd5≤1.9399;

[0072] 16.08≤Vd5≤67.70;

[0073] 3.12≤Vd8-Vd6≤52.32;

[0074] 25.07≤Vd7≤29.9;

[0075] Wherein, Φ3, Φ4, Φ5, Φ6, Φ7 and Φ8 represent the optical power of the third lens 30, the fourth lens 40, the fifth lens 50, the sixth lens 60, the seventh lens 70 and the eighth lens 80, respectively; Φ represents the overall optical power of the fixed-focus lens; Vd3, Nd4, Vd4, Nd5, Vd5, Vd8-Vd6 and Vd7 represent the Abbe number of the third lens 30, the refractive index of the fourth lens 40, the Abbe number of the fourth lens 40, the refractive index of the fifth lens 50, the Abbe number of the fifth lens 50, the Abbe number of the eighth lens 80 minus the Abbe number of the sixth lens 60 and the Abbe number of the seventh lens 70, respectively.

[0076] Optionally, the third lens 30 is a plastic aspherical lens or a glass spherical lens with a convex object side, the fourth lens 40 is a glass spherical lens or a plastic aspherical lens with a convex image side, the fifth lens 50 is a biconvex glass spherical lens or a plastic aspherical lens, the sixth lens 60 is a biconvex glass spherical lens or a plastic aspherical lens, the seventh lens 70 is a glass spherical lens with a concave image side, and the eighth lens is a biconvex glass spherical lens.

[0077] When the third lens 30, fourth lens 40, fifth lens 50, sixth lens 60, seventh lens 70, and eighth lens 80 meet this range, the introduction of advanced spherical aberration can be reduced, chromatic aberration can be corrected, and it is beneficial to achieve large aperture, infrared confocal focus, and short overall length. Specifically, the seventh lens 70 and the eighth lens 80 form a cemented doublet, or the sixth lens 60, seventh lens 70, and eighth lens 80 form a cemented lens. The cemented lenses formed by the sixth lens 60, seventh lens 70, and eighth lens 80 can be bonded together with adhesive or supported by spacers.

[0078] Optionally, the optical power of the ninth lens 90 and the tenth lens 100 satisfies:

[0079] -0.919≤Φ9 / Φ≤0.332;

[0080] -0.194≤Φ10 / Φ≤0.639;

[0081] Wherein, Φ9 represents the optical angle of the ninth lens at 90 degrees, Φ10 represents the optical power of the tenth lens at 100 degrees, and Φ represents the overall optical power of the fixed-focus lens.

[0082] Optionally, the ninth lens 90 is a plastic aspherical lens, and the tenth lens 100 is a plastic aspherical lens.

[0083] When the ninth lens 90 and the tenth lens 100 meet the above range, the angle of light rays reaching the image plane can be reduced, ensuring a relatively high illumination of the image and facilitating aberration correction, thus ensuring resolution.

[0084] By rationally allocating parameters such as the material, optical power, center thickness of each lens, and on-axis spacing between each lens, the aberrations of the lens in the wavelength range of 436nm to 850nm can be reasonably corrected and balanced, enabling the above-mentioned fixed-focus lens system to achieve at least one beneficial effect such as large aperture, ultra-wide angle, and infrared confocal focus.

[0085] In this embodiment, the surface of the aspherical lens satisfies the following formula:

[0086]

[0087] 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, which is numerically the reciprocal of the radius of curvature; k is the coefficient of the fitted cone; A, B, C, D, E, F, and G are the 4th, 6th, 8th, 10th, 12th, 14th, and 16th order coefficients of the aspherical polynomial, respectively.

[0088] For example, Table 1 shows the relationship with Figure 1 The specific parameters of the corresponding prime lens are as follows:

[0089] Table 1 Specific parameters of fixed-focus lenses

[0090] Scope of protection Example 1 lower limit upper limit Φ1 / Φ -0.552 -0.561 -0.450 Φ2 / Φ -0.107 -0.158 0.037 Φ3 / Φ 0.270 -0.038 0.296 Φ4 / Φ -0.122 -0.158 0.333 Φ5 / Φ 0.239 0.128 0.271 Φ6 / Φ 0.380 0.143 0.525 Φ7 / Φ -0.755 -0.970 -0.523 Φ8 / Φ 0.594 0.578 0.771 Φ9 / Φ -0.201 -0.919 0.332 Φ10 / Φ 0.263 -0.194 0.639 Nd4 1.5351 1.4974 1.9484 Nd5 1.9108 1.5906 1.9399 Vd1 40.73 34.00 43.00 Vd3 20.80 16.08 67.71 Vd4 55.71 20.28 58.93 Vd5 35.25 16.08 67.70 Vd8-Vd6 5.22 3.12 52.32 Vd7 25.48 25.07 29.90

[0091] Table 2 shows the parameter data for each lens in Example 1. Example 1 can achieve a focal length f = 2.985mm, an aperture number F# = 1.086, and an image plane... A fixed-focus lens with a field of view (FOV) of 151.15°.

[0092] Table 2. Design values ​​of optical physical parameters for the fixed-focus lens in Example 1.

[0093]

[0094]

[0095] The surface numbers are assigned according to the order of the lens surfaces. S12 and S13 are cemented surfaces; "OBJ" represents the object plane of a fixed-focus lens; "STO" represents the aperture stop of a fixed-focus lens, located at S11; "IMA" represents the image plane of a fixed-focus lens; the radius of curvature represents the curvature of the lens surface, with a positive value indicating that the surface bends towards the image plane and a negative value indicating that the surface bends towards the object plane. "Infinity" indicates that the surface is flat, with an infinite radius of curvature and an infinite distance; the thickness represents the central axial distance between the current surface and the next surface; the refractive index represents the ability of the material between the current surface and the next surface to deflect light, with a space indicating that the current position is air and the refractive index is 1; the Abbe number represents the dispersion characteristics of the material between the current surface and the next surface, with a space indicating that the current position is air; half-aperture represents the effective diameter of the lens; and the k-value represents the magnitude of the conic coefficient of the aspherical surface.

[0096] Table 3 shows the design values ​​of the aspherical parameters in Example 1:

[0097]

[0098]

[0099] Continued from Table 3

[0100] Face number E F G S3 3.8653E-08 6.9723E-09 -4.3989E-10 S4 5.2545E-07 -1.8700E-08 1.7780E-10 S5 2.1999E-07 -7.3010E-09 7.5257E-11 S6 -6.0824E-09 -1.1313E-10 1.0027E-11 S7 -2.6832E-08 -3.3701E-10 3.3870E-11 S8 -1.5341E-08 1.2802E-09 -3.5228E-11 S15 -1.3477E-07 5.2882E-09 1.4619E-11 S16 -8.0258E-09 -5.5081E-09 2.6906E-10 S17 2.5694E-07 -3.6236E-09 -8.3773E-11 S18 3.3054E-08 -4.5156E-09 2.8930E-10

[0101] Where -8.5590E-04 indicates that the coefficient of A for surface number S3 is -8.5590E×10 -4 .

[0102] Figure 2 This is a schematic diagram of the axial aberration curves for Example 1. The vertical direction represents the normalized aperture, 0 indicates being on the optical axis, and the vertical vertex represents the maximum pupil radius. The horizontal direction represents the offset relative to the ideal focal point, in millimeters (mm). Different colored curves in the figure represent different wavelengths of the system imaging, determined by... Figure 2 It can be seen that the axial aberrations of different wavelengths are all controlled within the range of (-0.05mm, +0.05mm), indicating that the aberrations of this fixed-focus lens are well controlled at each wavelength, which can meet the requirements of wide-spectrum applications.

[0103] Figure 3 This is a schematic diagram of another fixed-focus lens provided in an embodiment of the present invention. Table 4 shows the structure of the lens. Figure 3 The specific parameters of the corresponding prime lens are as follows:

[0104] Table 4. Specific parameters of fixed-focus lenses

[0105]

[0106]

[0107] Table 5 shows the parameter data for each lens in Example 2. Example 2 can achieve a focal length f = 2.969mm, an aperture number F# = 1.150, and an image plane... A fixed-focus lens with a field of view (FOV) of 151.93°.

[0108] Table 5. Design values ​​of optical physical parameters for the fixed-focus lens in Example 2.

[0109]

[0110]

[0111] The surface numbers are assigned according to the order of the lens surfaces. S14 is the cemented surface; "OBJ" represents the object plane of the fixed-focus lens; "STO" represents the aperture stop of the fixed-focus lens, located at S9; "IMA" represents the image plane of the fixed-focus lens; the radius of curvature represents the curvature of the lens surface, with a positive value indicating that the surface bends towards the image plane and a negative value indicating that the surface bends towards the object plane. "Infinity" indicates that the surface is flat, with an infinite radius of curvature and an infinite distance; the thickness represents the central axial distance between the current surface and the next surface; the refractive index represents the ability of the material between the current surface and the next surface to deflect light, with a space indicating that the current position is air and the refractive index is 1; the Abbe number represents the dispersion characteristics of the material between the current surface and the next surface, with a space indicating that the current position is air; half-aperture represents the effective diameter of the lens; and the k-value represents the magnitude of the conic coefficient of the aspherical surface.

[0112] Table 6 shows the design values ​​of the aspherical parameters in Example 2:

[0113]

[0114]

[0115] Continued from Table 6

[0116] Face number E F G S3 -1.0082E-08 6.8662E-09 -2.3290E-10 S4 5.1213E-07 -2.7349E-08 6.4480E-10 S7 -3.6033E-08 -1.0147E-09 1.1966E-10 S8 -3.2343E-08 7.4009E-10 8.9291E-12 S11 1.6814E-07 -7.5846E-09 1.6163E-10 S12 1.3391E-09 -8.7646E-10 4.6947E-11 S16 4.7729E-06 -8.3019E-07 4.1664E-08 S17 -7.5091E-08 -1.0358E-07 8.2725E-09 S18 -2.8291E-07 -1.7148E-07 1.2638E-08 S19 1.6948E-06 -2.4678E-07 1.3041E-08

[0117] Where -5.3849E-04 indicates that the coefficient of A for surface number S3 is -5.3849 × 10 -4 .

[0118] Figure 4 This is a schematic diagram of the axial aberration curves for Example 2. The vertical direction represents the normalized aperture, 0 indicates being on the optical axis, and the vertical vertex represents the maximum pupil radius. The horizontal direction represents the offset relative to the ideal focal point, in millimeters (mm). Different colored curves in the figure represent different wavelengths of the system imaging, determined by... Figure 4It can be seen that the axial aberrations of different wavelengths are all controlled within the range of (-0.05mm, +0.05mm), indicating that the aberrations of this fixed-focus lens are well controlled at each wavelength, which can meet the requirements of wide-spectrum applications.

[0119] Figure 5 This is a schematic diagram of another fixed-focus lens provided in an embodiment of the present invention. Table 7 shows the structure of the lens. Figure 5 The specific parameters of the corresponding prime lens are as follows:

[0120] Table 7 Specific parameters of fixed-focus lenses

[0121]

[0122]

[0123] Table 8 shows the parameter data for each lens in Example 3. Example 3 can achieve a focal length f = 2.976mm, an aperture number F# = 1.083, and an image plane... A fixed-focus lens with a field of view (FOV) of 151.4°.

[0124] Table 8. Design values ​​of optical physical parameters for the fixed-focus lens in Example 3.

[0125]

[0126]

[0127] The surface numbers are assigned according to the order of the lens surfaces. S12 and S13 are cemented surfaces; "OBJ" represents the object plane of a fixed-focus lens; "STO" represents the aperture stop of a fixed-focus lens, located at S11; "IMA" represents the image plane of a fixed-focus lens; the radius of curvature represents the curvature of the lens surface, with a positive value indicating that the surface bends towards the image plane and a negative value indicating that the surface bends towards the object plane. "Infinity" indicates that the surface is flat, with an infinite radius of curvature and an infinite distance; the thickness represents the central axial distance between the current surface and the next surface; the refractive index represents the ability of the material between the current surface and the next surface to deflect light, with a space indicating that the current position is air and the refractive index is 1; the Abbe number represents the dispersion characteristics of the material between the current surface and the next surface, with a space indicating that the current position is air; half-aperture represents the effective diameter of the lens; and the k-value represents the magnitude of the conic coefficient of the aspherical surface.

[0128] Table 9 shows the design values ​​of the aspherical parameters in Example 3:

[0129] Face number A B C D S3 -1.495616E-03 2.167066E-04 -4.298448E-06 -9.507184E-07 S4 3.787460E-03 -3.155335E-05 3.644356E-05 -5.737729E-06 S5 -1.199874E-04 -1.588626E-05 1.474267E-06 -6.083735E-10 S6 -5.680208E-05 1.408778E-05 2.373569E-07 2.106396E-09 S9 1.761518E-04 -9.491499E-07 2.599117E-07 4.011682E-09 S10 -1.177728E-04 3.791393E-06 4.653426E-07 -2.660611E-09 S15 -5.641394E-04 -1.149469E-04 -4.280682E-06 -8.890076E-09 S16 1.447811E-03 -8.181737E-05 7.284303E-06 1.192556E-07 S17 -2.830871E-03 4.936886E-05 6.444983E-06 -4.271942E-07 S18 -2.515761E-03 -6.289748E-05 1.021694E-05 -8.282016E-08

[0130] Continued from Table 9

[0131]

[0132]

[0133] Where -1.495616E-03 indicates that the coefficient of A for surface number S3 is -1.495616 × 10 -3 .

[0134] Figure 6 This is a schematic diagram of the axial aberration curves for Example 3. The vertical direction represents the normalized aperture, 0 indicates being on the optical axis, and the vertical vertex represents the maximum pupil radius. The horizontal direction represents the offset relative to the ideal focal point, in millimeters (mm). Different colored curves in the figure represent different wavelengths of the system imaging, determined by... Figure 6 It can be seen that the axial aberrations of different wavelengths are all controlled within the range of (-0.05mm, +0.05mm), indicating that the aberrations of this fixed-focus lens are well controlled at each wavelength, which can meet the requirements of wide-spectrum applications.

[0135] Figure 7 This is a schematic diagram of another fixed-focus lens provided in an embodiment of the present invention. For example, Table 10 shows the structure of a fixed-focus lens. Figure 7 The specific parameters of the corresponding prime lens are as follows:

[0136] Table 10 Specific parameters of fixed-focus lenses

[0137]

[0138]

[0139] Table 11 shows the parameter data for each lens in Example 4. Example 4 can achieve a focal length f = 3.007mm, an aperture number F# = 1.089, and an image plane... A fixed-focus lens with a field of view (FOV) of 150.36°.

[0140] Table 11 Design values ​​of optical physical parameters for the fixed-focus lens in Example 4

[0141]

[0142]

[0143] The surface numbers are assigned according to the order of the lens surfaces. S12 and S13 are cemented surfaces; "OBJ" represents the object plane of a fixed-focus lens; "STO" represents the aperture stop of a fixed-focus lens, located at S4; "IMA" represents the image plane of a fixed-focus lens; the radius of curvature represents the curvature of the lens surface, with a positive value indicating that the surface bends towards the image plane and a negative value indicating that the surface bends towards the object plane. "Infinity" indicates that the surface is flat, with an infinite radius of curvature and an infinite distance; the thickness represents the central axial distance between the current surface and the next surface; the refractive index represents the ability of the material between the current surface and the next surface to deflect light, with a space indicating that the current position is air and the refractive index is 1; the Abbe number represents the dispersion characteristics of the material between the current surface and the next surface, with a space indicating that the current position is air; half-aperture represents the effective diameter of the lens; and the k-value represents the magnitude of the conic coefficient of the aspherical surface.

[0144] Table 12 shows the design values ​​of the aspherical parameters in Example 4:

[0145] Face number A B C D S3 -1.5015E-03 2.1447E-04 -3.8142E-06 -9.7576E-07 S4 3.7754E-03 -3.0024E-05 3.6381E-05 -5.7394E-06 S5 -1.0586E-04 -1.6558E-05 1.5535E-06 -1.5819E-10 S6 -5.8125E-05 1.4053E-05 2.3236E-07 2.0319E-09 S9 1.6236E-04 -8.9946E-07 2.4116E-07 3.2472E-09 S10 -1.1324E-04 3.7176E-06 4.6615E-07 -2.6629E-09 S15 -5.9152E-04 -9.0814E-05 -4.1795E-06 -2.2219E-08 S16 1.7157E-03 -4.1316E-05 5.1652E-06 5.8746E-08 S17 -2.6826E-03 2.2675E-05 8.5573E-06 -2.0882E-07 S18 -2.6261E-03 -7.4968E-05 1.0180E-05 1.9805E-08

[0146] Continued from Table 12

[0147]

[0148]

[0149] Where -1.5015E-03 indicates that the coefficient of A for surface number S3 is -1.5015 × 10 -3 .

[0150] Figure 8 This is a schematic diagram of the axial aberration curves for Example 4. The vertical direction represents the normalized aperture, 0 indicates being on the optical axis, and the vertical vertex represents the maximum pupil radius. The horizontal direction represents the offset relative to the ideal focal point, in millimeters (mm). Different colored curves in the figure represent different wavelengths of the system imaging, determined by... Figure 8 It can be seen that the axial aberrations of different wavelengths are all controlled within the range of (-0.05mm, +0.05mm), indicating that the aberrations of this fixed-focus lens are well controlled at each wavelength, which can meet the requirements of wide-spectrum applications.

[0151] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A fixed-focus lens, characterized in that, It includes ten lenses of optical power arranged sequentially from the object side to the image side along the optical axis, the ten lenses being 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; Wherein, the first lens is a glass lens with negative optical power, the second lens is a plastic lens, the third lens is a plastic lens or a glass lens, the fourth lens is a glass lens or a plastic lens, the fifth lens is a glass lens or a plastic lens with positive optical power, the sixth lens is a glass lens or a plastic lens with positive optical power, the seventh lens is a glass lens with negative optical power, the eighth lens is a glass lens with positive optical power, the ninth lens is a plastic lens, the tenth lens is a plastic lens, and the number of glass lenses and plastic lenses is five each; The third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens satisfy the following: -0.038≤Φ3 / Φ≤0.296; -0.158≤Φ4 / Φ≤0.333; 0.128≤Φ5 / Φ≤0.271; 0.143≤Φ6 / Φ≤0.525; -0.970≤Φ7 / Φ≤-0.523; 0.578≤Φ8 / Φ≤0.771; 16.08≤Vd3≤67.71; 1.4974≤Nd4≤1.9484; 20.28≤Vd4≤58.93; 1.5906≤Nd5≤1.9399; 16.08≤Vd5≤67.70; 3.12≤Vd8-Vd6≤52.32; 25.07≤Vd7≤29.9; Wherein, Φ3, Φ4, Φ5, Φ6, Φ7, and Φ8 represent the optical power of the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens, respectively; Φ represents the overall optical power of the fixed-focus lens; Vd3, Nd4, Vd4, Nd5, Vd5, Vd8-Vd6, and Vd7 represent the Abbe number of the third lens, the refractive index of the fourth lens, the Abbe number of the fourth lens, the refractive index of the fifth lens, the Abbe number of the fifth lens, the Abbe number of the eighth lens minus the Abbe number of the sixth lens, and the Abbe number of the seventh lens, respectively.

2. The fixed-focus lens according to claim 1, characterized in that, All glass lenses are spherical lenses, and all plastic lenses are aspherical lenses.

3. The fixed-focus lens according to claim 1, characterized in that, The first lens and the second lens satisfy the following: -0.561≤Φ1 / Φ≤-0.450; -0.158≤Φ2 / Φ≤0.037; 34.00 <Vd1<43.00; Wherein, Φ1 represents the optical power of the first lens, Φ2 represents the optical power of the second lens, Φ represents the overall optical power of the fixed-focus lens, and Vd1 represents the Abbe number of the first lens.

4. The fixed-focus lens according to claim 3, characterized in that, The first lens is a convex-concave glass spherical lens, and the second lens is a concave-convex plastic aspherical lens.

5. The fixed-focus lens according to claim 1, characterized in that, The third lens is a plastic aspherical lens or a glass spherical lens with a convex object-side surface; the fourth lens is a glass spherical lens or a plastic aspherical lens with a convex image-side surface; the fifth lens is a biconvex glass spherical lens or a plastic aspherical lens; the sixth lens is a biconvex glass spherical lens or a plastic aspherical lens; the seventh lens is a glass spherical lens with a concave image-side surface; and the eighth lens is a biconvex glass spherical lens.

6. The fixed-focus lens according to claim 1, characterized in that, The optical power of the ninth lens and the tenth lens satisfies: -0.919≤Φ9 / Φ≤0.332; -0.194≤Φ10 / Φ≤0.639; Wherein, Φ9 represents the optical angle of the ninth lens, Φ10 represents the optical power of the tenth lens, and Φ represents the overall optical power of the fixed-focus lens.

7. The fixed-focus lens according to claim 6, characterized in that, The ninth lens is a plastic aspherical lens, and the tenth lens is a plastic aspherical lens.

8. The fixed-focus lens according to claim 1, characterized in that, The aperture number of the fixed-focus lens ranges from 1.08 to 1.15, and the total optical length of the fixed-focus lens is less than or equal to 22.5 mm.

9. The fixed-focus lens according to claim 1, characterized in that, It also includes a filter, which is located between the tenth lens and the image plane.

Images