A zoom lens

Abstract

The application discloses a zoom lens. The zoom lens comprises a negative focal length focusing lens group, a diaphragm, a positive focal length zoom lens group and a positive focal length fixed lens group arranged in sequence along an optical axis from an object side to an image side; the diaphragm is located on the side of the zoom lens group close to the focusing lens group, the switching of the zoom lens between a wide-angle end and a long-focus end is realized by changing the positions of the focusing lens group and the zoom lens group on the optical axis; the zoom lens satisfies the following conditions: -1.590<=F1 / FW<=-1.500; 1.720<=F2 / FW<=1.820; F1 is the focal length of the focusing lens group, F2 is the focal length of the zoom lens group, and FW is the focal length of the wide-angle end. The zoom lens provided by the application uses 10 lenses to form a three-group structure, realizes full-waveband confocal in a 436nm-870nm waveband under a 1 / 2.7" target surface, has a smaller size, higher image quality and is suitable for use in more environments.

Description

Technical Field

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

[0002] In the security field, zoom lenses have been widely used due to their advantages such as long shooting distance and wide shooting angle. With the development of technology, cameras are gradually moving towards miniaturization and refinement, which also puts forward more stringent requirements for mainstream zoom lenses.

[0003] In the current market environment, small-magnification zoom lenses with 1 / 2.7″ mainstream chips are widely used and play an important role in fields such as security. However, since the small-magnification zoom lenses on the market are relatively large and only have 4MP resolution, it is necessary to develop a small-sized small-magnification zoom lens with a resolution of 4K. Summary of the Invention

[0004] This invention provides a zoom lens. The zoom lens uses 10 lens elements to form a three-element structure, achieving full-band confocal focusing within the 436nm~870nm wavelength range at a 1 / 2.7″ target surface. Furthermore, the lens is smaller, has higher image quality, and is suitable for a wider range of applications.

[0005] According to one aspect of the present invention, a zoom lens is provided, comprising a negative optical power focusing lens group, an aperture, a positive optical power zoom lens group, and a positive optical power fixed lens group arranged sequentially along the optical axis from the object side to the image side.

[0006] The focusing lens group includes a first lens with negative optical power, a second lens with negative or positive optical power, a third lens with negative optical power, and a fourth lens with positive optical power.

[0007] The zoom lens group includes a fifth lens with positive optical power, a sixth lens with positive optical power, a seventh lens with negative optical power, an eighth lens with positive or negative optical power, and a ninth lens with positive or negative optical power.

[0008] The fixed lens group includes a tenth lens with positive optical power;

[0009] The aperture stop is located on the side of the zoom lens group closer to the focusing lens group. By changing the positions of the focusing lens group and the zoom lens group on the optical axis, the zoom lens can switch between the wide-angle end and the telephoto end.

[0010] The zoom lens satisfies the following relationship:

[0011] -1.590≤F1 / FW≤-1.500;

[0012] 1.720≤F2 / FW≤1.820;

[0013] Wherein, F1 represents the focal length of the focusing lens group, F2 represents the focal length of the zoom lens group, and FW represents the focal length of the zoom lens at the wide-angle end.

[0014] The zoom lens provided in this embodiment of the invention includes a focusing lens group with negative optical power, an aperture stop, a zoom lens group with positive optical power, and a fixed lens group with positive optical power, arranged sequentially from the object side to the image side along the optical axis. The focusing lens group includes a first lens with negative optical power, a second lens with negative or positive optical power, a third lens with negative optical power, and a fourth lens with positive optical power. The zoom lens group includes a fifth lens with positive optical power, a sixth lens with positive optical power, a seventh lens with negative optical power, an eighth lens with positive or negative optical power, and a ninth lens with positive or negative optical power. The fixed lens group includes a tenth lens with positive optical power. The aperture stop is located on the side of the zoom lens group closer to the focusing lens group. By changing the positions of the focusing lens group and the zoom lens group on the optical axis, the zoom lens can switch between wide-angle and telephoto ends. The technical solution of this invention, using the three-group zoom lens composed of the above-mentioned combination, can achieve technical advantages such as fast focusing speed, stable focus during zooming, and excellent close-range performance. Simultaneously, using a mechanism with one group for focusing, two groups for zooming, and three groups for fixing, the entire zooming process is completed inside the lens, with a constant lens barrel length, achieving good sealing and center of gravity balance, and adapting to more usage scenarios. Furthermore, using the above-mentioned lens with the aforementioned optical power combination can reduce the overall length of the zoom lens, achieving the goal of minimizing lens size to the greatest extent. At the same time, it achieves high resolution throughout the entire zoom range and at different focusing distances. Through the reasonable combination of optical power, light passes through the lens more smoothly, largely correcting the impact of advanced aberrations on image quality. It achieves full-band confocal focusing at a 1 / 2.7″ target surface in the 436nm~870nm wavelength range, with a smaller lens size and higher image quality, suitable for the needs of a wider range of environments.

[0015] 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

[0016] 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.

[0017] Figure 1This is a schematic diagram of the structure of a zoom lens at the wide-angle end according to an embodiment of the present invention;

[0018] Figure 2 for Figure 1 A schematic diagram of the structure of a medium zoom lens at the telephoto end;

[0019] Figure 3 An axial aberration curve of a zoom lens at the wide-angle end is provided for an embodiment of the present invention;

[0020] Figure 4 A fan pattern of a zoom lens at a 0-degree field of view at the wide-angle end is provided in an embodiment of the present invention;

[0021] Figure 5 A fan-shaped optical pattern of a zoom lens at a 16.75-degree field of view at the wide-angle end, provided for an embodiment of the present invention;

[0022] Figure 6 A fan-shaped optical pattern of a zoom lens at a 27.36-degree field of view at the wide-angle end, provided for an embodiment of the present invention;

[0023] Figure 7 A fan-shaped optical pattern of a zoom lens at a 38.91-degree field of view at the wide-angle end, provided for an embodiment of the present invention;

[0024] Figure 8 A fan-shaped optical pattern of a zoom lens at a 48.12-degree field of view at the wide-angle end, provided for an embodiment of the present invention;

[0025] Figure 9 A fan-shaped optical pattern of a zoom lens at a 54.89-degree field of view at the wide-angle end, provided for an embodiment of the present invention;

[0026] Figure 10 A transverse chromatic aberration curve of a zoom lens at the wide-angle end is provided as an embodiment of the present invention;

[0027] Figure 11 An axial aberration curve of a zoom lens at the telephoto end is provided for an embodiment of the present invention;

[0028] Figure 12 A field-of-view pattern of a zoom lens at the telephoto end with a 0-degree field of view, provided as an embodiment of the present invention;

[0029] Figure 13 A fan-shaped optical pattern of a zoom lens at a 7.64-degree field of view at the telephoto end, provided as an embodiment of the present invention;

[0030] Figure 14 A field-of-view diagram of a zoom lens at a 12.49-degree field of view at the telephoto end, provided as an embodiment of the present invention;

[0031] Figure 15A fan-shaped optical pattern of a zoom lens at a 17.83-degree field of view at the telephoto end, provided as an embodiment of the present invention;

[0032] Figure 16 A field-of-view diagram of a zoom lens at a 22.19-degree field of view at the telephoto end, provided as an embodiment of the present invention;

[0033] Figure 17 A field-of-view diagram of a zoom lens at a 25.51-degree field of view at the telephoto end, provided as an embodiment of the present invention;

[0034] Figure 18 A transverse chromatic aberration curve of a zoom lens at the telephoto end is provided as an embodiment of the present invention;

[0035] Figure 19 This is a schematic diagram of another zoom lens at the wide-angle end provided in an embodiment of the present invention;

[0036] Figure 20 for Figure 19 A schematic diagram of the structure of a medium zoom lens at the telephoto end;

[0037] Figure 21 An axial aberration curve of a zoom lens at the wide-angle end is provided for an embodiment of the present invention;

[0038] Figure 22 Another zoom lens with a 0-degree field of view at the wide-angle end, provided as an embodiment of the present invention;

[0039] Figure 23 A fan-shaped optical pattern of another zoom lens with a 16.49-degree field of view at the wide-angle end, provided for an embodiment of the present invention;

[0040] Figure 24 A fan-shaped optical pattern of another zoom lens at a 27.49-degree field of view at the wide-angle end, provided for an embodiment of the present invention;

[0041] Figure 25 A fan-shaped optical pattern of another zoom lens at a 38.48-degree field of view at the wide-angle end, provided for an embodiment of the present invention;

[0042] Figure 26 Another zoom lens provided in this embodiment of the invention has a field of view of 49.35 degrees at the wide-angle end;

[0043] Figure 27 Another zoom lens provided in this embodiment of the invention has a field of view of 54.62 degrees at the wide-angle end;

[0044] Figure 28 A transverse chromatic aberration curve of a zoom lens at the wide-angle end is provided for an embodiment of the present invention;

[0045] Figure 29An axial aberration curve of a zoom lens at the telephoto end is provided for an embodiment of the present invention;

[0046] Figure 30 Another optical fan pattern of a zoom lens at a 0-degree field of view at the telephoto end, provided as an embodiment of the present invention;

[0047] Figure 31 A fan-shaped optical pattern of another zoom lens with a 7.66-degree field of view at the telephoto end, provided as an embodiment of the present invention;

[0048] Figure 32 A fan-shaped optical pattern of another zoom lens at a 12.76-degree field of view at the telephoto end, provided for an embodiment of the present invention;

[0049] Figure 33 A fan-shaped optical pattern of another zoom lens at a 17.84-degree field of view at the telephoto end, provided as an embodiment of the present invention;

[0050] Figure 34 Another zoom lens provided in this embodiment of the invention has a field of view of 22.90 degrees at the telephoto end;

[0051] Figure 35 A fan-shaped optical pattern of a zoom lens at a 25.43-degree field of view at the telephoto end, provided as an embodiment of the present invention;

[0052] Figure 36 A transverse chromatic aberration curve of a zoom lens at the telephoto end is provided as an embodiment of the present invention;

[0053] Figure 37 This is a schematic diagram of the structure of another zoom lens at the wide-angle end provided in an embodiment of the present invention;

[0054] Figure 38 for Figure 37 A schematic diagram of the structure of a medium zoom lens at the telephoto end;

[0055] Figure 39 An axial aberration curve of a zoom lens at the wide-angle end is provided for an embodiment of the present invention;

[0056] Figure 40 This invention provides another example of a zoom lens with a 0-degree field of view at the wide-angle end;

[0057] Figure 41 A fan-shaped optical pattern of a zoom lens at a 16.84-degree field of view at the wide-angle end, provided as an embodiment of the present invention;

[0058] Figure 42 A fan-shaped optical pattern of a zoom lens at a 27.43-degree field of view at the wide-angle end, provided as an embodiment of the present invention;

[0059] Figure 43A fan-shaped optical pattern of a zoom lens at a 38.90-degree field of view at the wide-angle end, as provided in an embodiment of the present invention;

[0060] Figure 44 A fan-shaped optical pattern of a zoom lens at a 48.02-degree field of view at the wide-angle end, provided as an embodiment of the present invention;

[0061] Figure 45 A fan-shaped optical pattern of another zoom lens at a 54.61-degree field of view at the wide-angle end, provided for an embodiment of the present invention;

[0062] Figure 46 A transverse chromatic aberration curve of a zoom lens at the wide-angle end is provided as an embodiment of the present invention;

[0063] Figure 47 An axial aberration curve of a zoom lens at the telephoto end is provided for an embodiment of the present invention;

[0064] Figure 48 This invention provides another example of a zoom lens with a 0-degree field of view at the telephoto end;

[0065] Figure 49 A fan-shaped optical pattern of a zoom lens at a 7.66-degree field of view at the telephoto end, provided as an embodiment of the present invention;

[0066] Figure 50 A fan-shaped optical pattern of a zoom lens at a 12.75-degree field of view at the telephoto end, provided as an embodiment of the present invention;

[0067] Figure 51 A fan-shaped optical pattern of a zoom lens at a 17.81-degree field of view at the telephoto end, provided as an embodiment of the present invention;

[0068] Figure 52 A fan-shaped optical pattern of a zoom lens at a 22.88-degree field of view at the telephoto end, provided as an embodiment of the present invention;

[0069] Figure 53 A fan-shaped optical pattern of a zoom lens at a 25.43-degree field of view at the telephoto end, provided as an embodiment of the present invention;

[0070] Figure 54 This is a chromatic aberration curve of a zoom lens at the telephoto end, provided as an embodiment of the present invention. Detailed Implementation

[0071] 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.

[0072] 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.

[0073] Figure 1 This is a schematic diagram of a zoom lens at the wide-angle end, provided as an embodiment of the present invention. (Reference) Figure 1 The zoom lens provided in this embodiment of the invention includes a negative optical power focusing lens group 10, an aperture stop 20, a positive optical power zoom lens group 30, and a positive optical power fixed lens group 40 arranged sequentially along the optical axis from the object side to the image side; the focusing lens group 10 includes a first lens 101 with negative optical power, a second lens 102 with negative or positive optical power, a third lens 103 with negative optical power, and a fourth lens 104 with positive optical power; the zoom lens group 30 includes a fifth lens with positive optical power. 301, a sixth lens with positive optical power; 302, a seventh lens with negative optical power; 303, an eighth lens with either positive or negative optical power; and a ninth lens with either positive or negative optical power; the fixed lens group 40 includes a tenth lens with positive optical power; the aperture stop 20 is located on the side of the zoom lens group 30 closer to the focusing lens group 10, and by changing the position of the focusing lens group 10 and the zoom lens group 30 on the optical axis, the zoom lens can switch between the wide-angle end and the telephoto end.

[0074] Zoom lenses satisfy the following relationship:

[0075] -1.590≤F1 / FW≤-1.500;

[0076] 1.720≤F2 / FW≤1.820;

[0077] Where F1 represents the focal length of the focusing lens group 10, F2 represents the focal length of the zoom lens group 30, and FW represents the focal length of the zoom lens at the wide-angle end.

[0078] 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. In practical implementation, refer to... Figure 1 The zoom lens also includes a flat glass plate 50, which is located on the side closest to the image plane. The flat glass plate 50 protects the photosensitive chip in the imaging sensor, which converts the light signals collected by the zoom lens into electrical signals, thereby ensuring the imaging effect of the zoom lens. The focusing lens group 10, aperture 20, zoom lens group 30, fixed lens group 40, and flat glass plate 50 can be housed in a single lens barrel. Figure 1 Within the lens assembly (not shown), the position of the fixed lens group 40 is fixed. The focal length of the lens is changed by moving the focusing lens group 10, the aperture stop 20, and the zoom lens group 30. During the zooming process, when the focal length is shortest, the zoom lens is located at the wide-angle end, and when the focal length is longest, the zoom lens is located at the telephoto end. At the wide-angle end and the telephoto end, the zoom lens has different focal lengths and optical powers, as well as different lengths or shapes. It should be noted that... Figure 1 The structural diagrams in the following embodiments are for illustrative purposes only, and shapes such as aspherical surfaces are not represented in accordance with actual conditions.

[0079] The technical solution of this invention, using the aforementioned three-group zoom lens, achieves advantages such as fast focusing speed, stable focus during zooming, and excellent close-range performance. Simultaneously, the use of a mechanism with one group for focusing, two groups for zooming, and three groups for fixing allows the entire zooming process to be completed inside the lens, maintaining a constant lens barrel length, achieving good sealing and center-of-gravity balance, and adapting to a wider range of usage scenarios. Furthermore, using the aforementioned lens with the aforementioned optical power combination reduces the overall length of the zoom lens, minimizing its size. It also achieves high resolution across the entire zoom range and at different focusing distances. Combined with the internal zoom structure, the cemented lens elements in the zoom group, and the aperture that moves with the zoom group, it ensures high and low temperature imaging quality. Through the reasonable combination of optical power, light passes through the lens more smoothly, largely correcting the impact of advanced aberrations on image quality. This achieves full-band confocal focusing at a 1 / 2.7″ aperture within the 436nm~870nm wavelength range, while maintaining a smaller lens size and higher image quality, suitable for a wider range of usage environments.

[0080] Based on the above embodiments, optionally, along the optical axis from the object side to the image side, in the focusing lens group 10, the first lens 101 is a convex-concave lens, the second lens 102 is a concave-convex lens, the third lens 103 is a concave-concave lens, and the fourth lens 104 is a convex-concave lens; in the zoom lens group 30, the fifth lens 301 is a convex-convex lens, the sixth lens 302 is a convex-convex lens, the seventh lens 303 is a concave-concave lens, the center position of the eighth lens 304 is concave-convex, and the center position of the ninth lens 305 is convex-concave; in the fixed lens group 40, the tenth lens 401 is a concave-convex lens or a convex-concave lens.

[0081] By setting the shape of each lens, the optical power of each lens can be adapted.

[0082] Optionally, the zoom lens includes at least four glass lenses, and both the focusing lens group 10 and the zoom lens group 30 contain at least one plastic aspherical lens, while the fixed lens group 40 includes one plastic aspherical lens.

[0083] Optionally, the first lens 101 is a glass spherical lens, the second lens 102, the third lens 103 and the fourth lens 104 are all plastic aspherical lenses; the fifth lens 301 is a glass aspherical lens, the sixth lens 302 and the seventh lens 303 are both glass spherical lenses, the eighth lens 304 and the ninth lens 305 are both plastic aspherical lenses, and the sixth lens 302 and the seventh lens 303 form a cemented lens group.

[0084] Glass and plastic are two materials that can compensate for each other. Using a combination of glass and plastic lenses in zoom lenses can effectively balance the lens's resolution under high and low temperatures. At the same time, a suitable combination of glass lenses also provides good correction for lens aberrations. Using these materials ensures good resolution within a temperature range of -40℃ to 80℃. Furthermore, glass lenses can significantly correct chromatic aberration. The aforementioned combination of glass lenses can achieve good resolution across the entire wavelength range of 430nm to 850nm, expanding the usability of zoom lenses.

[0085] After light passes through aperture 20, the cemented lens group can compensate for chromatic aberration in the light passing through the glass aspherical lens. This assembly-line-like processing greatly improves the efficiency and effectiveness of aberration correction. Furthermore, placing the cemented doublet lens close to the rear of the glass aspherical lens provides stability and compensation. The cemented doublet lens itself, as a single unit, offers good stability, helping to reduce the sensitivity of the entire optical system to the assembly tolerances of the aspherical lens and lower manufacturing costs.

[0086] The tenth lens 401 uses a plastic aspherical lens to control advanced aberrations at the lens's rear end, further improving image quality. In addition, using an aspherical lens at the lens's rear end allows for more precise control of the light's exit angle, improving the matching degree between the lens and the signal receiving device and preventing vignetting, color shift, noise, etc., that occur at the image edges due to excessively large or small incident angles of light. From a cost perspective, using a plastic aspherical lens can reduce costs, decrease lens weight, simplify the structure, reduce potential failure points, and increase reliability during use.

[0087] Optionally, the focusing lens group 10 and the zoom lens group 30 satisfy the following relationship during the process of switching the zoom lens from the wide-angle end to the telephoto end:

[0088] 0.030≤S1 / TTL≤0.220;

[0089] 0.030≤S1 / S2≤0.270;

[0090] Wherein, S1 represents the distance between the closest position and the farthest position of the focusing lens group 10 to the image plane during the movement, S2 represents the distance between the closest position and the farthest position of the zoom lens group 30 to the image plane during the movement, and TTL represents the total optical length of the zoom lens at the wide-angle end.

[0091] By controlling the movement distance of the focusing lens group 10 and the zoom lens group 30, the movement stroke of the focusing lens group 10 is controlled, ensuring that the zoom lens can respond quickly during focusing. It also has strong close-range focusing capabilities; simultaneously, using the above structure, aberration compensation can be accurately located, ensuring performance at different object distances.

[0092] Optionally, the first lens 101, the fifth lens 301, the sixth lens 302, and the seventh lens 303 satisfy the following requirements:

[0093] 1.430≤nd1≤1.600;68.000≤vd1≤94.600;

[0094] 1.430≤nd5≤1.560;70.200≤vd5≤95.200;

[0095] 1.430≤nd6≤1.560;71.700≤vd6≤95.200;

[0096] 1.670≤nd7≤1.770; 26.500≤vd7≤32.200;

[0097] Wherein, nd1, nd5, nd6 and nd7 represent the refractive indices of the first lens 101, the fifth lens 301, the sixth lens 302 and the seventh lens 303, respectively; vd1, vd5, vd6 and vd7 represent the Abbe numbers of the first lens 101, the fifth lens 301, the sixth lens 302 and the seventh lens 303, respectively.

[0098] The first lens 101 in the focusing lens group 10 uses glass material, which can protect the zoom lens to a certain extent and extend its service life. On the other hand, it can also play a certain role in aberration correction, avoiding excessive chromatic aberration at the rear of the zoom lens that is difficult to correct. The fifth lens 301 in the zoom lens group 30 uses glass material with a high Abbe number, which can correct chromatic aberration of light before it enters the aperture stop as much as possible, avoiding greater impact on the rear. At the same time, the fifth lens 301 is a glass lens, which can ensure the high and low temperature conditions of the zoom lens group 30 to a certain extent.

[0099] The sixth lens 302 and the seventh lens 303 in the zoom lens group 30 are cemented together to form a cemented lens group. Both lenses are made of glass and can work with the fifth lens 301 to control the high and low temperature conditions of the zoom group. Furthermore, the cemented glass lenses effectively eliminate chromatic aberration in light that has just passed through the aperture. Combined with other plastic aspherical lenses, this enables high-resolution 4K image quality, maintaining the stability of the optical system in various environments while ensuring fast focusing. In addition, the combination of plastic and glass lenses reduces lens weight, optimizing lens cost and production efficiency.

[0100] Optionally, the maximum lens diameter ΦG1 in the focusing lens group 10 has the following relationship with the total optical length TTL of the zoom lens at the wide-angle end:

[0101] 0.360 < ΦG1 / TTL < 0.400.

[0102] By controlling the ratio of the front aperture to the overall length, it is possible to miniaturize and lighten the optical system, while balancing the conflict between aperture and field of view, thus reducing the design cost of zoom lenses.

[0103] Optionally, the sixth lens 302 and the seventh lens 303 form a cemented lens group, and the cemented lens group and the zoom lens group 30 satisfy the following relationship:

[0104] -3.340 <EFL67 / F2<-1.510;

[0105] Where EFL67 represents the total focal length of the cemented lens group, and F2 represents the focal length of the zoom lens group 30.

[0106] By controlling the ratio of the total focal length of the lens group consisting of the sixth lens 302 and the seventh lens 303 in the zoom lens group 30 to the focal length of the zoom lens group 30, insufficient or excessive chromatic aberration correction is avoided, thus achieving the goal of balancing aberrations. In addition, when this ratio is within a reasonable range, the zoom lens can precisely match the required amount of chromatic aberration correction at all focal lengths, achieving good control of chromatic aberration at the wide-angle, medium-telephoto, and telephoto ends.

[0107] Optionally, the focal length of a zoom lens at the wide-angle end satisfies the following relationship:

[0108] 0.560≤sinCRA×FW≤0.780;

[0109] Where FW represents the focal length of the zoom lens at the wide-angle end, and CRA represents the principal ray angle of the zoom lens at the wide-angle end.

[0110] By controlling the relationship between the sine value of the principal ray angle and the focal length, the zoom lens and the image sensor are optimally matched, thereby obtaining a high-quality image that is consistent from the center to the edge.

[0111] Optionally, the focal lengths of a zoom lens at the wide-angle and telephoto ends satisfy the following relationship:

[0112] FT / FW ≥ 2.15;

[0113] Where FW represents the focal length of the zoom lens at the wide-angle end, and FT represents the focal length of the zoom lens at the telephoto end.

[0114] By controlling the focal length ratio between the wide-angle and telephoto ends of a zoom lens, the zoom range and focal length range of the zoom lens can be controlled to meet the usage needs under more conditions.

[0115] In this embodiment of the invention, the aspherical lens of the zoom lens satisfies the following formula:

[0116] ;

[0117] Where Z is the axial distance from the vertex of the surface at a position perpendicular to the optical axis and at a height of r along the optical axis; c represents the curvature at the vertex of the non-spherical surface; and k is the fitting conic coefficient. , , , , , These are the higher-order aspheric coefficients corresponding to the fourth, sixth, eighth, tenth, twelfth, and fourteenth orders of aspheric surfaces. These can be combined to form higher-order terms for the corresponding aspherical surfaces.

[0118] For example, Figure 2 for Figure 1 A schematic diagram of the structure of a medium zoom lens at the telephoto end is shown in Table 1. Figure 1 and Figure 2 Specific parameters of the adaptive zoom lens:

[0119] Table 1 Specific parameters of zoom lenses

[0120]

[0121] Table 2 is... Figure 1 and Figure 2 The specific design parameters of each lens in the zoom lens are as follows:

[0122] Table 2 Design values ​​of various lens parameters for zoom lenses

[0123]

[0124] In Table 2, the surface numbers are assigned according to the surface sequence of each lens. Surface number 13 represents the cemented surface of the cemented doublet lens, 21 and 22 represent the two surfaces of the protective glass, "STO" represents the aperture of the zoom lens, IMA represents the image plane, the radius of curvature represents the curvature of the corresponding lens surface, a positive value means the surface bends towards the image plane, and a negative value means the surface bends towards the object plane, where "INF" indicates that the surface is flat and the radius of curvature is infinite; the thickness represents the central axial distance between the current surface and the next surface, and the units of the radius of curvature and the thickness are both millimeters; the material (nd) is the refractive index, which represents the ability of the material between the current surface and the next surface to deflect light, and a blank space represents the current position as air with a refractive index of 1; the material (vd) is the Abbe number, which represents the dispersion characteristics of the material between the current surface and the next surface.

[0125] Table 3 shows the zoom interval values ​​in Table 2:

[0126] Table 3 Zoom intervals at the wide-angle and telephoto ends of zoom lenses

[0127]

[0128] Table 4 is... Figure 1 and Figure 2 Aspherical surface parameters in medium zoom lenses:

[0129] Table 4 Aspherical parameters of zoom lenses

[0130]

[0131] Continued from Table 4

[0132]

[0133] Among them, 5.35191797096613E-04 represents face number 3. The coefficient is 5.35191797096613 × 10 -4 .

[0134] Table 5 shows the performance indicators achieved in this embodiment.

[0135] Table 5 Performance Specifications of Zoom Lenses

[0136]

[0137] Figure 3 This invention provides an axial aberration curve of a zoom lens at the wide-angle end, where the vertical direction represents the normalized pupil diameter, 0 indicates it is on the optical axis, and the vertex in the vertical direction represents the maximum pupil radius; the dominant wavelength is 546.074 nm, and the horizontal direction represents the offset relative to the dominant wavelength, in millimeters (mm). Figure 3 It can be seen that the axial aberration of the normalized pupil diameter at different wavelengths (0~1.0) is controlled within a reasonable range, indicating that the zoom lens achieves good control of axial aberration at the wide-angle end. Furthermore, under full pupil coverage, there is no significant chromatic aberration between visible and infrared light, meeting the basic requirement for clear imaging at night and achieving a clear image across the entire wavelength range.

[0138] Ray fan diagrams are one of the commonly used evaluation methods by optical designers. Figure 4 This invention provides an optical fan pattern for a zoom lens at a 0-degree field of view in the wide-angle end. Figure 5 This invention provides an optical fan pattern for a zoom lens with a 16.75-degree field of view at the wide-angle end. Figure 6 This invention provides an optical fan pattern for a zoom lens at a 27.36-degree field of view at the wide-angle end. Figure 7 This invention provides an optical fan pattern for a zoom lens at a 38.91-degree field of view at the wide-angle end. Figure 8 This invention provides an optical fan pattern for a zoom lens with a 48.12-degree field of view at the wide-angle end. Figure 9 An optical fan pattern of a zoom lens at a 54.89-degree field of view at the wide-angle end, as provided in an embodiment of the present invention, is shown below. Figures 4-9 As shown in the figure, the horizontal axis represents the normalized beam aperture, and the vertical axis represents the transverse aberration. Ideally, each curve should completely coincide with the horizontal axis, at which point all rays in the field of view should focus at the same point on the image plane. The vertical axis can also represent the maximum dispersion range of the beam on the ideal image plane. The fan diagram not only reflects monochromatic aberrations of different wavelengths but also the magnitude of transverse chromatic aberration. Figures 4-9It can be seen that this zoom lens closely approximates the horizontal axis at all wavelengths across all fields of view, indicating that its transverse aberrations at all wavelengths are well corrected. In addition, the curves for each color do not show significant dispersion, indicating that this zoom lens also has good correction for chromatic aberration, ensuring the imaging requirement of sharp images across the entire wavelength range.

[0139] Figure 10 This invention provides a transverse chromatic aberration curve of a zoom lens at the wide-angle end, as provided in an embodiment of the invention. The vertical direction represents the field of view of the zoom lens, 0 indicates it is on the optical axis, and the vertex in the transverse direction represents the maximum pupil radius. The dominant wavelength is 546.074 nm, and the horizontal direction represents the offset of each wavelength 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 reasonable range, indicating that the transverse chromatic aberration of the zoom lens is well controlled at the wide-angle end, which can meet the requirements of wide spectrum application across the entire wavelength range.

[0140] Figure 11 This invention provides an axial aberration curve of a zoom lens at the telephoto end. The vertical direction represents the normalized pupil diameter, with 0 indicating it is on the optical axis. The vertex in the vertical direction represents the maximum pupil radius. The dominant wavelength is 546.074 nm, 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 the normalized pupil diameters (0-1.0) at different wavelengths are all controlled within a reasonable range, indicating that the zoom lens achieves good control of axial aberrations at the telephoto end. Furthermore, under full pupil coverage, there is no significant chromatic aberration between visible and infrared light, meeting the basic requirement for clear nighttime imaging and achieving a clear image across the entire wavelength range.

[0141] Figure 12 This invention provides an optical fan pattern for a zoom lens at a 0-degree field of view at the telephoto end. Figure 13 This invention provides an optical fan pattern for a zoom lens with a 7.64-degree field of view at the telephoto end. Figure 14 This invention provides an optical fan pattern for a zoom lens at a 12.49-degree field of view at the telephoto end. Figure 15 This invention provides an optical fan pattern for a zoom lens at a 17.83-degree field of view at the telephoto end. Figure 16 This invention provides an optical fan pattern for a zoom lens at a 22.19-degree field of view at the telephoto end. Figure 17 An optical fan pattern of a zoom lens at a 25.51-degree field of view at the telephoto end, provided as an embodiment of the present invention, is shown below. Figures 12-17As shown in the figure, the horizontal axis represents the normalized beam aperture, and the vertical axis represents the transverse aberration. Ideally, each curve should completely coincide with the horizontal axis, at which point all rays in the field of view should focus at the same point on the image plane. The vertical axis can also represent the maximum dispersion range of the beam on the ideal image plane. The fan diagram not only reflects monochromatic aberrations of different wavelengths but also the magnitude of transverse chromatic aberration. Figures 12-17 It can be seen that this zoom lens closely approximates the horizontal axis at all wavelengths across all fields of view, indicating that its transverse aberrations at all wavelengths are well corrected. In addition, the curves for each color do not show significant dispersion, indicating that this zoom lens also has good correction for chromatic aberration, ensuring the imaging requirement of sharp images across the entire wavelength range.

[0142] Figure 18 This invention provides a transverse chromatic aberration curve of a zoom lens at the telephoto end. The vertical direction represents the field of view of the zoom lens, with 0 indicating on the optical axis and the vertical vertex representing the maximum field of view. The dominant wavelength is 546.074 nm. The horizontal direction represents the offset of the imaging position of each wavelength relative to the imaging position of the dominant wavelength under the current field of view, in micrometers (μm). Figure 18 It can be seen that the transverse chromatic aberration at different wavelengths is controlled within a reasonable range, indicating that the transverse chromatic aberration of the zoom lens is well controlled at the telephoto end, which can meet the requirements of wide-spectrum applications for clear imaging across the entire band.

[0143] Figure 19 This is a schematic diagram of another zoom lens at the wide-angle end provided in an embodiment of the present invention. Figure 20 for Figure 19 A schematic diagram of the structure of a medium zoom lens at the telephoto end is shown in Table 6. Figure 19 and Figure 20 Specific parameters of the adaptive zoom lens:

[0144] Table 6 Specific parameters of zoom lenses

[0145]

[0146] Table 7 is... Figure 19 and Figure 20 The specific design parameters of each lens in the zoom lens are as follows:

[0147] Table 7 Design values ​​of various lens parameters for zoom lenses

[0148]

[0149] In Table 7, the surface numbers are assigned according to the surface sequence of each lens. Surface number 13 represents the cemented surface of the cemented doublet lens, 21 and 22 represent the two surfaces of the protective glass, "STO" represents the aperture stop of the zoom lens, IMA represents the image plane, the radius of curvature represents the curvature of the corresponding lens surface, a positive value means the surface bends towards the image plane, and a negative value means the surface bends towards the object plane, where "INF" indicates that the surface is flat and the radius of curvature is infinite; the thickness represents the central axial distance between the current surface and the next surface, and the units of the radius of curvature and the thickness are both millimeters; the material (nd) is the refractive index, which represents the ability of the material between the current surface and the next surface to deflect light, and a blank space represents the current position as air with a refractive index of 1; the material (vd) is the Abbe number, which represents the dispersion characteristics of the material between the current surface and the next surface.

[0150] Table 8 shows the zoom interval values ​​from Table 7:

[0151] Table 8 Zoom intervals at the wide-angle and telephoto ends of zoom lenses

[0152]

[0153] Table 9 is... Figure 19 and Figure 20 Aspherical surface parameters in medium zoom lenses:

[0154] Table 9 Aspherical parameters of zoom lenses

[0155]

[0156] Continued from Table 9

[0157]

[0158] Where -9.67246490620104E-04 represents face number 3. The coefficient is -9.67246490620104×10 -4 .

[0159] Table 10 shows the performance indicators achieved in this embodiment.

[0160] Table 10 Performance Specifications of Zoom Lenses

[0161]

[0162] Figure 21 This invention provides an axial aberration curve of a zoom lens at the wide-angle end, where the vertical direction represents the normalized pupil diameter, 0 indicates it is on the optical axis, and the vertex in the vertical direction represents the maximum pupil radius; the dominant wavelength is 546.074 nm, and the horizontal direction represents the offset relative to the dominant wavelength, in millimeters (mm). Figure 21 It can be seen that the axial aberration of the normalized pupil diameter at different wavelengths (0~1.0) is controlled within a reasonable range, indicating that the zoom lens achieves good control of axial aberration at the wide-angle end. Furthermore, under full pupil coverage, there is no significant chromatic aberration between visible and infrared light, meeting the basic requirement for clear imaging at night and achieving a clear image across the entire wavelength range.

[0163] Figure 22 This invention provides another zoom lens with a 0-degree field of view at the wide-angle end, as shown in this embodiment of the invention. Figure 23 The optical fan pattern of another zoom lens with a 16.49-degree field of view at the wide-angle end, provided as an embodiment of the present invention. Figure 24 The optical fan pattern of another zoom lens at a 27.49-degree field of view at the wide-angle end, provided as an embodiment of the present invention. Figure 25 The optical fan pattern of another zoom lens at a 38.48-degree field of view at the wide-angle end, provided as an embodiment of the present invention. Figure 26 The optical fan pattern of another zoom lens at a 49.35-degree field of view at the wide-angle end, provided as an embodiment of the present invention. Figure 27 Another zoom lens provided in this embodiment of the invention has a field of view of 54.62 degrees at the wide-angle end, as shown in the image. Figures 22-27 As shown in the figure, the horizontal axis represents the normalized beam aperture, and the vertical axis represents the transverse aberration. Ideally, each curve should completely coincide with the horizontal axis, at which point all rays in the field of view should focus at the same point on the image plane. The vertical axis can also represent the maximum dispersion range of the beam on the ideal image plane. The fan diagram not only reflects monochromatic aberrations of different wavelengths but also the magnitude of transverse chromatic aberration. Figures 22-27 It can be seen that this zoom lens closely approximates the horizontal axis at all wavelengths across all fields of view, indicating that its transverse aberrations at all wavelengths are well corrected. In addition, the curves for each color do not show significant dispersion, indicating that this zoom lens also has good correction for chromatic aberration, ensuring the imaging requirement of sharp images across the entire wavelength range.

[0164] Figure 28 This invention provides a transverse chromatic aberration curve of a zoom lens at the wide-angle end, as provided in an embodiment of the invention. The vertical direction represents the field of view of the zoom lens, 0 indicates it is on the optical axis, and the vertex in the transverse direction represents the maximum pupil radius. The dominant wavelength is 546.074 nm, and the horizontal direction represents the offset of each wavelength relative to the dominant wavelength, in micrometers (μm). Figure 28 It can be seen that the transverse chromatic aberration of different wavelengths is controlled within a reasonable range, indicating that the transverse chromatic aberration of the zoom lens is well controlled at the wide-angle end, which can meet the requirements of wide spectrum application across the entire wavelength range.

[0165] Figure 29This invention provides an axial aberration curve of a zoom lens at the telephoto end. The vertical direction represents the normalized pupil diameter, with 0 indicating it is on the optical axis. The vertex in the vertical direction represents the maximum pupil radius. The dominant wavelength is 546.074 nm, and the horizontal direction represents the offset relative to the dominant wavelength, in millimeters (mm). Figure 29 It can be seen that the axial aberrations of the normalized pupil diameters (0-1.0) at different wavelengths are all controlled within a reasonable range, indicating that the zoom lens achieves good control of axial aberrations at the telephoto end. Furthermore, under full pupil coverage, there is no significant chromatic aberration between visible and infrared light, meeting the basic requirement for clear nighttime imaging and achieving a clear image across the entire wavelength range.

[0166] Figure 30 This is another optical fan pattern of a zoom lens at a 0-degree field of view at the telephoto end, provided as an embodiment of the present invention. Figure 31 The optical fan pattern of another zoom lens with a 7.66-degree field of view at the telephoto end, provided as an embodiment of the present invention. Figure 32 The optical fan pattern of another zoom lens at a 12.76-degree field of view at the telephoto end, provided as an embodiment of the present invention. Figure 33 The optical fan pattern of another zoom lens at a 17.84-degree field of view at the telephoto end, provided as an embodiment of the present invention. Figure 34 The optical fan pattern of another zoom lens at a 22.90-degree field of view at the telephoto end, provided as an embodiment of the present invention. Figure 35 An optical fan pattern of a zoom lens at a 25.43-degree field of view at the telephoto end, provided as an embodiment of the present invention, is shown below. Figures 30-35 As shown in the figure, the horizontal axis represents the normalized beam aperture, and the vertical axis represents the transverse aberration. Ideally, each curve should completely coincide with the horizontal axis, at which point all rays in the field of view should focus at the same point on the image plane. The vertical axis can also represent the maximum dispersion range of the beam on the ideal image plane. The fan diagram not only reflects monochromatic aberrations of different wavelengths but also the magnitude of transverse chromatic aberration. Figures 30-36 It can be seen that this zoom lens closely approximates the horizontal axis at all wavelengths across all fields of view, indicating that its transverse aberrations at all wavelengths are well corrected. In addition, the curves for each color do not show significant dispersion, indicating that this zoom lens also has good correction for chromatic aberration, ensuring the imaging requirement of sharp images across the entire wavelength range.

[0167] Figure 36 This invention provides a transverse chromatic aberration curve of a zoom lens at the telephoto end. The vertical direction represents the field of view of the zoom lens, with 0 indicating on the optical axis and the vertical vertex representing the maximum field of view. The dominant wavelength is 546.074 nm. The horizontal direction represents the offset of the imaging position of each wavelength relative to the imaging position of the dominant wavelength under the current field of view, in micrometers (μm). Figure 36It can be seen that the transverse chromatic aberration at different wavelengths is controlled within a reasonable range, indicating that the transverse chromatic aberration of the zoom lens is well controlled at the telephoto end, which can meet the requirements of wide-spectrum applications for clear imaging across the entire band.

[0168] Figure 37 This is a schematic diagram of the structure of another zoom lens at the wide-angle end provided in an embodiment of the present invention. Figure 38 for Figure 37 A schematic diagram of the structure of a medium zoom lens at the telephoto end is shown in Table 11. Figure 37 and Figure 38 Specific parameters of the adaptive zoom lens:

[0169] Table 11 Specific parameters of zoom lenses

[0170]

[0171] Table 12 is... Figure 37 and Figure 38 The specific design parameters of each lens in the zoom lens are as follows:

[0172] Table 12 Design values ​​of various lens parameters for zoom lenses

[0173]

[0174] In Table 12, the surface numbers are assigned according to the surface sequence of each lens. Surface number 13 represents the cemented surface of the cemented doublet lens, 21 and 22 represent the two surfaces of the protective glass, "STO" represents the aperture of the zoom lens, IMA represents the image plane, the radius of curvature represents the curvature of the corresponding lens surface, a positive value means that the surface bends towards the image plane, and a negative value means that the surface bends towards the object plane, where "INF" indicates that the surface is flat and the radius of curvature is infinite; the thickness represents the central axial distance between the current surface and the next surface, and the units of the radius of curvature and the thickness are both millimeters; the material (nd) is the refractive index, which represents the ability of the material between the current surface and the next surface to deflect light, and a blank space represents that the current position is air with a refractive index of 1; the material (vd) is the Abbe number, which represents the dispersion characteristics of the material between the current surface and the next surface.

[0175] Table 13 shows the zoom interval values ​​from Table 12:

[0176] Table 13 Zoom intervals at the wide-angle and telephoto ends of zoom lenses

[0177]

[0178] Table 14 is... Figure 37 and Figure 38 Aspherical surface parameters in medium zoom lenses:

[0179] Table 14 Aspherical parameters of zoom lenses

[0180]

[0181] Continued from Table 14

[0182]

[0183] Among them, 1.69169649933620E-03 represents face number 3. The coefficient is 1.69169649933620 × 10 -3 .

[0184] Table 15 shows the performance indicators achieved in this embodiment.

[0185] Table 15 Performance Specifications of Zoom Lenses

[0186]

[0187] Figure 39 This invention provides an axial aberration curve of a zoom lens at the wide-angle end, where the vertical direction represents the normalized pupil diameter, 0 indicates it is on the optical axis, and the vertex in the vertical direction represents the maximum pupil radius; the dominant wavelength is 546.074 nm, and the horizontal direction represents the offset relative to the dominant wavelength, in millimeters (mm). Figure 39 It can be seen that the axial aberration of the normalized pupil diameter at different wavelengths (0~1.0) is controlled within a reasonable range, indicating that the zoom lens achieves good control of axial aberration at the wide-angle end. Furthermore, under full pupil coverage, there is no significant chromatic aberration between visible and infrared light, meeting the basic requirement for clear imaging at night and achieving a clear image across the entire wavelength range.

[0188] Figure 40 This is another example of a zoom lens with a 0-degree field of view at the wide-angle end, provided by an embodiment of the present invention. Figure 41 This invention provides another zoom lens with a 16.84-degree field of view at the wide-angle end, as shown in this embodiment of the invention. Figure 42 This is another zoom lens with a 27.43-degree field of view at the wide-angle end, provided as an embodiment of the present invention. Figure 43 This invention provides another zoom lens with a field of view of 38.90 degrees at the wide-angle end, as shown in an embodiment of the invention. Figure 44 This is another example of a zoom lens with a 48.02-degree field of view at the wide-angle end, provided by an embodiment of the present invention. Figure 45 Another zoom lens provided in this embodiment of the invention has a field of view of 54.61 degrees at the wide-angle end, as shown in the image. Figures 40-45As shown in the figure, the horizontal axis represents the normalized beam aperture, and the vertical axis represents the transverse aberration. Ideally, each curve should completely coincide with the horizontal axis, at which point all rays in the field of view should focus at the same point on the image plane. The vertical axis can also represent the maximum dispersion range of the beam on the ideal image plane. The fan diagram not only reflects monochromatic aberrations of different wavelengths but also the magnitude of transverse chromatic aberration. Figures 40-45 It can be seen that this zoom lens closely approximates the horizontal axis at all wavelengths across all fields of view, indicating that its transverse aberrations at all wavelengths are well corrected. In addition, the curves for each color do not show significant dispersion, indicating that this zoom lens also has good correction for chromatic aberration, ensuring the imaging requirement of sharp images across the entire wavelength range.

[0189] Figure 46 This invention provides a transverse chromatic aberration curve of a zoom lens at the wide-angle end, as provided in an embodiment of the invention. The vertical direction represents the field of view of the zoom lens, 0 indicates it is on the optical axis, and the vertex in the transverse direction represents the maximum pupil radius. The dominant wavelength is 546.074 nm, and the horizontal direction represents the offset of each wavelength relative to the dominant wavelength, in micrometers (μm). Figure 46 It can be seen that the transverse chromatic aberration of different wavelengths is controlled within a reasonable range, indicating that the transverse chromatic aberration of the zoom lens is well controlled at the wide-angle end, which can meet the requirements of wide spectrum application across the entire wavelength range.

[0190] Figure 47 This invention provides an axial aberration curve of a zoom lens at the telephoto end. The vertical direction represents the normalized pupil diameter, with 0 indicating it is on the optical axis. The vertex in the vertical direction represents the maximum pupil radius. The dominant wavelength is 546.074 nm, and the horizontal direction represents the offset relative to the dominant wavelength, in millimeters (mm). Figure 47 It can be seen that the axial aberrations of the normalized pupil diameters (0-1.0) at different wavelengths are all controlled within a reasonable range, indicating that the zoom lens achieves good control of axial aberrations at the telephoto end. Furthermore, under full pupil coverage, there is no significant chromatic aberration between visible and infrared light, meeting the basic requirement for clear nighttime imaging and achieving a clear image across the entire wavelength range.

[0191] Figure 48 This invention provides another example of a zoom lens with a 0-degree field of view at the telephoto end, as shown in this embodiment. Figure 49 This is another example of a zoom lens with a 7.66-degree field of view at the telephoto end, provided by an embodiment of the present invention. Figure 50 This invention provides another zoom lens with a 12.75-degree field of view at the telephoto end, as part of an embodiment of the invention. Figure 51 This invention provides another example of a zoom lens with a field of view of 17.81 degrees at the telephoto end. Figure 52 This invention provides another zoom lens with a 22.88-degree field of view at the telephoto end, as part of an embodiment of the invention. Figure 53 An optical fan pattern of a zoom lens at a 25.43-degree field of view at the telephoto end, provided as an embodiment of the present invention, is shown below. Figures 48-53 As shown in the figure, the horizontal axis represents the normalized beam aperture, and the vertical axis represents the transverse aberration. Ideally, each curve should completely coincide with the horizontal axis, at which point all rays in the field of view should focus at the same point on the image plane. The vertical axis can also represent the maximum dispersion range of the beam on the ideal image plane. The fan diagram not only reflects monochromatic aberrations of different wavelengths but also the magnitude of transverse chromatic aberration. Figures 48-53 It can be seen that this zoom lens closely approximates the horizontal axis at all wavelengths across all fields of view, indicating that its transverse aberrations at all wavelengths are well corrected. In addition, the curves for each color do not show significant dispersion, indicating that this zoom lens also has good correction for chromatic aberration, ensuring the imaging requirement of sharp images across the entire wavelength range.

[0192] Figure 54 This invention provides a transverse chromatic aberration curve of a zoom lens at the telephoto end. The vertical direction represents the field of view of the zoom lens, with 0 indicating on the optical axis and the vertical vertex representing the maximum field of view. The dominant wavelength is 546.074 nm. The horizontal direction represents the offset of the imaging position of each wavelength relative to the imaging position of the dominant wavelength under the current field of view, in micrometers (μm). Figure 54 It can be seen that the transverse chromatic aberration at different wavelengths is controlled within a reasonable range, indicating that the transverse chromatic aberration of the zoom lens is well controlled at the telephoto end, which can meet the requirements of wide-spectrum applications for clear imaging across the entire band.

[0193] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A zoom lens, characterized in that, It includes a focusing lens group with negative optical power, an aperture, a zoom lens group with positive optical power, and a fixed lens group with positive optical power, arranged sequentially from the object side to the image side along the optical axis. The focusing lens group includes a first lens with negative optical power, a second lens with negative or positive optical power, a third lens with negative optical power, and a fourth lens with positive optical power. The zoom lens group includes a fifth lens with positive optical power, a sixth lens with positive optical power, a seventh lens with negative optical power, an eighth lens with positive or negative optical power, and a ninth lens with positive or negative optical power. The fixed lens group includes a tenth lens with positive optical power; The aperture stop is located on the side of the zoom lens group closer to the focusing lens group. By changing the positions of the focusing lens group and the zoom lens group on the optical axis, the zoom lens can switch between the wide-angle end and the telephoto end. The zoom lens satisfies the following relationship: -1.590≤F1 / FW≤-1.500; 1.720≤F2 / FW≤1.820; Wherein, F1 represents the focal length of the focusing lens group, F2 represents the focal length of the zoom lens group, and FW represents the focal length of the zoom lens at the wide-angle end.

2. The zoom lens according to claim 1, characterized in that, Along the optical axis from the object side to the image side, in the focusing lens group, the first lens is a convex-concave lens, the second lens is a concave-convex lens, the third lens is a concave-concave lens, and the fourth lens is a convex-concave lens; In the zoom lens group, the fifth lens is a convex-convex lens, the sixth lens is a convex-convex lens, the seventh lens is a concave-concave lens, the center position of the eighth lens is concave-convex, and the center position of the ninth lens is convex-concave. In the fixed lens group, the tenth lens is a concave-convex lens or a convex-concave lens.

3. The zoom lens according to claim 1, characterized in that, The zoom lens includes at least four glass lenses, and both the focusing lens group and the zoom lens group contain at least one plastic aspherical lens. The fixed lens group includes one plastic aspherical lens.

4. The zoom lens according to claim 3, characterized in that, The first lens is a glass spherical lens, while the second, third, and fourth lenses are all plastic aspherical lenses; The fifth lens is a glass aspherical lens, the sixth and seventh lenses are both glass spherical lenses, and the eighth and ninth lenses are both plastic aspherical lenses.

5. A zoom lens according to claim 1, characterized in that, The focusing lens group and the zoom lens group satisfy the following relationship during the process of the zoom lens switching from the wide-angle end to the telephoto end: 0.030≤S1 / TTL≤0.220; 0.030≤S1 / S2≤0.270; Wherein, S1 represents the distance between the closest position and the farthest position of the focusing lens group to the image plane during the movement, S2 represents the distance between the closest position and the farthest position of the zoom lens group to the image plane during the movement, and TTL represents the total optical length of the zoom lens at the wide-angle end.

6. The zoom lens according to claim 1, characterized in that, The first lens, the fifth lens, the sixth lens, and the seventh lens satisfy the following requirements: 1.430≤nd1≤1.600;68.000≤vd1≤94.600; 1.430≤nd5≤1.560;70.200≤vd5≤95.200; 1.430≤nd6≤1.560;71.700≤vd6≤95.200; 1.670≤nd7≤1.770; 26.500≤vd7≤32.200; Wherein, nd1, nd5, nd6 and nd7 represent the refractive indices of the first lens, the fifth lens, the sixth lens and the seventh lens, respectively; vd1, vd5, vd6 and vd7 represent the Abbe numbers of the first lens, the fifth lens, the sixth lens and the seventh lens, respectively.

7. The zoom lens according to claim 1, characterized in that, The maximum lens diameter ΦG1 in the focusing lens group has the following relationship with the total optical length TTL of the zoom lens at the wide-angle end: 0.360 < ΦG1 / TTL < 0.

400.

8. The zoom lens according to claim 1, characterized in that, The sixth lens and the seventh lens form a cemented lens group, and the cemented lens group and the zoom lens group satisfy the following relationship: -3.340 <EFL67 / F2<-1.510; Wherein, EFL67 represents the total focal length of the cemented lens group, and F2 represents the focal length of the zoom lens group.

9. The zoom lens according to claim 1, characterized in that, The focal length of the zoom lens at the wide-angle end satisfies the following relationship: 0.560≤sinCRA×FW≤0.780; Wherein, FW represents the focal length of the zoom lens at the wide-angle end, and CRA represents the principal ray angle of the zoom lens at the wide-angle end.

10. The zoom lens according to claim 1, characterized in that, The focal lengths of the zoom lens at the wide-angle and telephoto ends satisfy the following relationship: 2.15≤FT / FW≤2.20; Wherein, FW represents the focal length of the zoom lens at the wide-angle end, and FT represents the focal length of the zoom lens at the telephoto end.

Images