Zoom lens

Abstract

The utility model discloses a zoom lens, which comprises a first fixed lens group with positive focal power, a zoom lens group with negative focal power, a diaphragm, a second fixed lens group with positive focal power, a focusing lens group with positive focal power and plate glass which are sequentially arranged from an object space to an image space along an optical axis, the relationship among the focal length F1 of the first fixed lens group, the focal length F2 of the zoom lens group, the focal length F3 of the second fixed lens group, the focal length F4 of the focusing lens group and the focal length FW of the wide-angle end of the zoom lens meets the condition that F1 / FW is more than or equal to 5.249 and less than or equal to 10.778; -2.802 < = F2 / FW < =-1.762; f3 / FW is more than or equal to 2.586 and less than or equal to 4.771; and 1.425 < = F4 / FW < = 2.653. The optical lens has the characteristics of large aperture, small distortion, long focal length and high imaging definition, and can meet the use requirements under a 1 / 1.2 ''target surface and a 436nm-850nm wave band.

Description

Technical Field

[0001] This utility model relates to the field of optical lens technology, and in particular to a zoom lens. Background Technology

[0002] An ITS (Intelligent Transportation System) lens is a lens specifically designed for image sensors. ITS lenses typically feature high resolution, low distortion, and high contrast, providing clear, accurate, and high-quality images. Their design takes into account optical characteristics, mechanical structure, and electronic interfaces, allowing them to effectively adapt to various complex environments.

[0003] Currently, most ITS lenses on the market are fixed focal length lenses, which have low image quality and poor tolerance in harsh environments. Faced with more complex usage environments, zoom lenses are gradually becoming the new favorite in the ITS field. However, the types of zoom lenses on the market specifically for ITS are extremely limited, and they have problems such as low image quality, too small focal length range, and large distortion, which pose certain difficulties in practical applications. Utility Model Content

[0004] This invention provides a zoom lens with the characteristics of large aperture, low distortion, long focal length, and high-definition imaging, which can meet the usage requirements in the 436nm-850nm band under a 1 / 1.2″ target surface.

[0005] To achieve the above objectives, this utility model provides a zoom lens, comprising: a first fixed lens group with positive optical power, a zoom lens group with negative optical power, an aperture stop, a second fixed lens group with positive optical power, a focusing lens group with positive optical power, and a flat glass plate arranged sequentially along the optical axis from the object side to the image side.

[0006] The relationship between the focal length F1 of the first fixed lens group, the focal length F2 of the zoom lens group, the focal length F3 of the second fixed lens group, the focal length F4 of the focusing lens group, and the focal length FW at the wide-angle end of the zoom lens satisfies:

[0007] 5.249≤F1 / FW≤10.778; -2.802≤F2 / FW≤-1.762; 2.586≤F3 / FW≤4.771; 1.425≤F4 / FW≤2.653.

[0008] Optionally, the first fixed lens group includes: a first lens with negative optical power, a second lens with positive optical power, and a third lens with positive optical power, wherein the first lens and the second lens are cemented together to form a first cemented lens.

[0009] Optionally, the object-side surface of the first lens is convex and the image-side surface is concave, the object-side surface of the second lens is convex and the image-side surface is concave, and the object-side surface of the third lens is convex and the image-side surface is concave.

[0010] Optionally, the zoom lens group includes: a fourth lens with negative optical power, a fifth lens with negative optical power, and a sixth lens with positive optical power, wherein the fifth lens and the sixth lens are cemented together to form a second cemented lens.

[0011] Optionally, the object-side surface of the fourth lens is concave, the image-side surface of the fifth lens is concave, and the object-side surface of the sixth lens is convex and the image-side surface is concave.

[0012] Optionally, the second fixed lens group includes: a seventh lens with positive optical power, an eighth lens with negative optical power, a ninth lens with positive optical power, a tenth lens with negative optical power, an eleventh lens with positive optical power, a twelfth lens with negative optical power, and a thirteenth lens with positive optical power. At least two of the eighth, ninth, and tenth lenses are cemented together to form a third cemented lens, and at least two of the eleventh, twelfth, and thirteenth lenses are cemented together to form a fourth cemented lens.

[0013] Optionally, the object-side surface of the seventh lens is convex, the image-side surface of the eighth lens is concave, the object-side surface of the ninth lens is convex, the image-side surface of the tenth lens is concave, the object-side surface of the eleventh lens is convex, the image-side surface of the eleventh lens is convex, the object-side surface of the twelfth lens is concave, and the image-side surface of the thirteenth lens is convex.

[0014] Optionally, the focal lengths F8-9-10 of the eighth lens, the ninth lens, and the tenth lens satisfy the following condition:

[0015] -0.955≤F8-9-10 / FG3≤-0.293;

[0016] The focal lengths F11-12-13 of the eleventh lens, the twelfth lens, and the thirteenth lens satisfy the following condition:

[0017] -2.195≤F11-12-13 / FG3≤2.009.

[0018] Optionally, the focusing lens group includes: a fourteenth lens with positive optical power, a fifteenth lens with positive optical power, and a sixteenth lens with negative optical power, wherein the fifteenth lens and the sixteenth lens are cemented together to form a fifth cemented lens.

[0019] Optionally, the object-side surface of the fourteenth lens is convex, the image-side surface of the fifteenth lens is convex, the object-side surface of the fifteenth lens is convex, and the image-side surface of the sixteenth lens is concave.

[0020] Optionally, the zoom lens has an aperture of WFNO ≤ 1.86 at the wide-angle end and an aperture of TFNO ≤ 1.92 at the telephoto end.

[0021] Optionally, the refractive index nd7 and Abbe number vd7 of the seventh lens in the second fixed lens group satisfy:

[0022] 1.795≤nd7≤2.05; 21.00≤vd7≤30.56;

[0023] The refractive index nd14 and Abbe number vd14 of the fourteenth lens in the focusing lens group satisfy:

[0024] 1.770≤nd14≤2.051; 20.36≤vd14≤29.74.

[0025] Optionally, the total length TTL of the zoom lens and the maximum moving distance S2 of the zoom lens group satisfy the following:

[0026] 2.681≤TTL / S2≤3.694.

[0027] According to the embodiments of this utility model, the zoom lens includes: a first fixed lens group with positive optical power, a zoom lens group with negative optical power, an aperture stop, a second fixed lens group with positive optical power, a focusing lens group with positive optical power, and a flat glass plate arranged sequentially from the object side to the image side along the optical axis; wherein, the relationship between the focal length F1 of the first fixed lens group, the focal length F2 of the zoom lens group, the focal length F3 of the second fixed lens group, the focal length F4 of the focusing lens group and the focal length FW of the wide-angle end of the zoom lens satisfies: 5.249≤F1 / FW≤10.778; -2.802≤F2 / FW≤-1.762; 2.586≤F3 / FW≤4.771; 1.425≤F4 / FW≤2.653. By configuring the focal lengths of each group as described above, a zoom lens with a focal length of 10-50mm and an image size of 13.1 can be obtained. This zoom lens features a large aperture, low distortion, long focal length, and high-definition imaging, and can meet the usage requirements in the 436nm-850nm band under a 1 / 1.2″ target surface.

[0028] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the wide-angle end of the zoom lens proposed in Embodiment 1 of this utility model;

[0031] Figure 2 This is a schematic diagram of the telephoto end of the zoom lens proposed in Embodiment 1 of this utility model;

[0032] Figure 3 This is the lateral chromatic aberration curve of the wide-angle end of the zoom lens proposed in Embodiment 1 of this utility model;

[0033] Figure 4 This is the vertical chromatic aberration curve at the telephoto end of the zoom lens proposed in Embodiment 1 of this utility model;

[0034] Figure 5 This is the ray fan diagram of the wide-angle end of the zoom lens proposed in Embodiment 1 of this utility model;

[0035] Figure 6 This is the ray fan diagram of the telephoto end of the zoom lens proposed in Embodiment 1 of this utility model;

[0036] Figure 7 This is the axial aberration curve at the wide-angle end of the zoom lens proposed in Embodiment 1 of this utility model;

[0037] Figure 8 This is the axial aberration curve at the telephoto end of the zoom lens proposed in Embodiment 1 of this utility model;

[0038] Figure 9 This is a schematic diagram of the wide-angle end of the zoom lens proposed in Embodiment 2 of this utility model;

[0039] Figure 10 This is a schematic diagram of the telephoto end of the zoom lens proposed in Embodiment 2 of this utility model;

[0040] Figure 11 This is the lateral chromatic aberration curve at the wide-angle end of the zoom lens proposed in Embodiment 2 of this utility model;

[0041] Figure 12 This is the vertical chromatic aberration curve at the telephoto end of the zoom lens proposed in Embodiment 2 of this utility model;

[0042] Figure 13 This is the ray fan diagram of the wide-angle end of the zoom lens proposed in Embodiment 2 of this utility model;

[0043] Figure 14 This is the ray fan diagram of the telephoto end of the zoom lens proposed in Embodiment 2 of this utility model;

[0044] Figure 15 This is the axial aberration curve at the wide-angle end of the zoom lens proposed in Embodiment 2 of this utility model;

[0045] Figure 16 This is the axial aberration curve at the telephoto end of the zoom lens proposed in Embodiment 2 of this utility model;

[0046] Figure 17 This is a schematic diagram of the wide-angle end of the zoom lens proposed in Embodiment 3 of this utility model;

[0047] Figure 18 This is a schematic diagram of the telephoto end of the zoom lens proposed in Embodiment 3 of this utility model;

[0048] Figure 19 This is the lateral chromatic aberration curve at the wide-angle end of the zoom lens proposed in Embodiment 3 of this utility model;

[0049] Figure 20 This is the vertical chromatic aberration curve at the telephoto end of the zoom lens proposed in Embodiment 3 of this utility model;

[0050] Figure 21 This is the ray fan diagram of the wide-angle end of the zoom lens proposed in Embodiment 3 of this utility model;

[0051] Figure 22 This is the light fan pattern of the telephoto end of the zoom lens proposed in Embodiment 3 of this utility model;

[0052] Figure 23 This is the axial aberration curve at the wide-angle end of the zoom lens proposed in Embodiment 3 of this utility model;

[0053] Figure 24 This is the axial aberration curve at the telephoto end of the zoom lens proposed in Embodiment 3 of this utility model;

[0054] Figure 25 This is a schematic diagram of the wide-angle end of the zoom lens proposed in Embodiment 4 of this utility model;

[0055] Figure 26 This is a schematic diagram of the telephoto end of the zoom lens proposed in Embodiment 4 of this utility model;

[0056] Figure 27 This is the lateral chromatic aberration curve of the wide-angle end of the zoom lens proposed in Embodiment 4 of this utility model;

[0057] Figure 28 This is the vertical chromatic aberration curve at the telephoto end of the zoom lens proposed in Embodiment 4 of this utility model;

[0058] Figure 29 This is the ray fan diagram of the wide-angle end of the zoom lens proposed in Embodiment 4 of this utility model;

[0059] Figure 30 This is the ray fan diagram of the telephoto end of the zoom lens proposed in Embodiment 4 of this utility model;

[0060] Figure 31 This is the axial aberration curve at the wide-angle end of the zoom lens proposed in Embodiment 4 of this utility model;

[0061] Figure 32 This is the axial aberration curve of the telephoto end of the zoom lens proposed in Embodiment 4 of this utility model. Detailed Implementation

[0062] 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. 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 protection scope of the present invention.

[0063] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model 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 utility model 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 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.

[0064] Figure 1 , Figure 9 , Figure 17 and Figure 25These are schematic diagrams of the zoom lens at the wide-angle end provided in various embodiments of this utility model. Figure 2 , Figure 10 , Figure 18 and Figure 26 This is a schematic diagram of the zoom lens at the telephoto end provided in various embodiments of the present invention. (Reference) Figure 1 , Figure 2 , Figure 9 , Figure 10 , Figure 17 , Figure 18 , Figure 25 and Figure 26 As shown, the zoom lens proposed in this embodiment of the present invention includes: arranged sequentially along the optical axis from the object side to the image side, a first fixed lens group G1 with positive optical power, a zoom lens group G2 with negative optical power, an aperture stop STO, a second fixed lens group G3 with positive optical power, a focusing lens group G4 with positive optical power, and a flat glass PD; the relationship between the focal length F1 of the first fixed lens group G1, the focal length F2 of the zoom lens group G2, the focal length F3 of the second fixed lens group G3, the focal length F4 of the focusing lens group G4 and the focal length FW at the wide-angle end of the zoom lens satisfies: 5.249≤F1 / FW≤10.778; -2.802≤F2 / FW≤-1.762; 2.586≤F3 / FW≤4.771; 1.425≤F4 / FW≤2.653.

[0065] Understandably, by configuring the first fixed lens group G1, zoom lens group G2, second fixed lens group G3, and focusing lens group G4, and changing the positions of zoom lens group G2 and focusing lens group G4 on the optical axis, the zoom lens can switch between wide-angle and telephoto ends. The use of the positive optical power first fixed lens group G1 and the negative optical power zoom lens group G2 at the front of the aperture stop (STO) ensures a larger light aperture after light passes through, increasing the zoom lens's F-number and meeting usage needs under different conditions. Furthermore, the first fixed lens group G1 and the zoom lens group can correct advanced chromatic aberration and aberrations, controlling the aberration balance of each group and ensuring that no severe aberrations occur when light enters the structure after the aperture stop, thus improving the image quality of the zoom lens. The second fixed lens group G3 and focusing lens group G4 after the aperture stop (STO) can correct aberrations at the rear of the lens, and together with the lens groups at the front of the aperture stop, they can stabilize the image quality of the zoom lens. Furthermore, maintaining the same aperture diameter across different focal lengths allows for a structurally smaller aperture range, ensuring a longer travel distance for the lens's movable elements. This enables higher magnification or a smaller overall size, meeting diverse usage requirements. Moreover, the positive-negative-positive-positive configuration of the four lens groups, along with the optimized allocation of power across each group and its internal components, ensures smoother light transmission and significantly corrects the impact of advanced aberrations on image quality. This effectively achieves low distortion and high-resolution imaging while maintaining a relatively compact overall structure. This zoom lens comprehensively combines zoom capabilities, a large aperture, low distortion, and a compact design.

[0066] Optionally, continue to refer to Figure 1 , Figure 2 , Figure 9 , Figure 10 , Figure 17 , Figure 18 , Figure 25 and Figure 26 As shown, the first fixed lens group G1 includes: a first lens L1 with negative optical power, a second lens L2 with positive optical power, and a third lens L3 with positive optical power. The first lens L1 and the second lens L2 are cemented together to form a first cemented lens.

[0067] Optionally, the object-side surface of the first lens L1 is convex and the image-side surface is concave; the object-side surface of the second lens L2 is convex and the image-side surface is concave; and the object-side surface of the third lens L3 is convex and the image-side surface is concave.

[0068] The first fixed lens group G1 uses a first cemented lens to correct advanced chromatic aberration and aberrations in the zoom lens. The first lens L1 is a convex-concave negative lens, which allows more light to enter the zoom lens. The second lens L2 is a convex-concave positive lens, and the third lens L3 is also a convex-concave positive lens. The second lens L2 and the third lens L3 are cemented together to correct the direction of light entering the zoom lens.

[0069] Optionally, continue to refer to Figure 1 , Figure 2 , Figure 9 , Figure 10 , Figure 17 , Figure 18 , Figure 25 and Figure 26 As shown, the zoom lens group G2 includes: a fourth lens L4 with negative optical power, a fifth lens L5 with negative optical power, and a sixth lens L6 with positive optical power. The fifth lens L5 and the sixth lens L6 are cemented together to form a second cemented lens.

[0070] Optionally, the object-side surface of the fourth lens L4 is concave, the image-side surface of the fifth lens L5 is concave, the object-side surface of the fifth lens L5 is concave, and the image-side surface of the sixth lens L6 is convex and concave.

[0071] The second cemented lens in the zoom lens group G2, in conjunction with the first cemented lens in the first fixed lens group G1, can correct advanced chromatic aberration and aberrations in the zoom lens. Furthermore, the fourth lens L4 is a concave-concave negative lens, the fifth lens L5 is a concave-concave negative lens, and the sixth lens L6 is a convex-concave positive lens, which can further adjust the direction of light entering the zoom lens. Negative lenses diffuse light, while positive lenses focus light.

[0072] Optionally, continue to refer to Figure 1 , Figure 2 , Figure 9 , Figure 10 , Figure 17 , Figure 18 , Figure 25 and Figure 26 As shown, the second fixed lens group G2 includes: a seventh lens L7 with positive optical power, an eighth lens L8 with negative optical power, a ninth lens L9 with positive optical power, a tenth lens L10 with negative optical power, an eleventh lens L11 with positive optical power, a twelfth lens L12 with negative optical power, and a thirteenth lens L13 with positive optical power. At least two of the eighth lens L8, the ninth lens L9, and the tenth lens L10 are cemented together to form a third cemented lens, and at least two of the eleventh lens L11, the twelfth lens L12, and the thirteenth lens L13 are cemented together to form a fourth cemented lens.

[0073] Optionally, the object-side surface of the seventh lens L7 is convex, and the image-side surface is convex; the object-side surface of the eighth lens L8 is concave, and the image-side surface is concave; the object-side surface of the ninth lens L9 is convex, and the image-side surface is convex; the object-side surface of the tenth lens L10 is concave, and the image-side surface is concave; the object-side surface of the eleventh lens L11 is convex, and the image-side surface is convex; the object-side surface of the twelfth lens L12 is concave, and the image-side surface is concave; and the object-side surface of the thirteenth lens L13 is convex, and the image-side surface is convex.

[0074] In this system, the seventh lens L7 is a convex-convex positive lens, the eighth lens L8 is a concave-concave negative lens, the ninth lens L9 is a convex-convex positive lens, the tenth lens L10 is a concave-concave negative lens, the eleventh lens L11 is a convex-convex positive lens, the twelfth lens L12 is a concave-concave negative lens, and the thirteenth lens L13 is a convex-convex positive lens. At least two lenses from the eighth lens L8, ninth lens L9, and tenth lens L10 are cemented together to form a third cemented lens, and at least two lenses from the eleventh lens L11, twelfth lens L12, and thirteenth lens L13 are cemented together to form a fourth cemented lens. The use of cemented lenses effectively shortens the overall length of the lens. Furthermore, the second fixed lens group G3 follows immediately behind the aperture stop STO, which restricts light rays from different angles of incidence, ensuring they enter the second fixed lens group G3 more smoothly and in a more concentrated manner. Therefore, using two cemented lens groups on the second fixed lens group G3 effectively corrects chromatic aberration and higher-order aberrations produced by the preceding lens group, compensating for the lack of aspherical lenses in the lens and improving the overall image quality of the system.

[0075] Optionally, the focal lengths F8-9-10 of the eighth lens L8, the ninth lens L9, and the tenth lens L10, and the focal length FG3 of the second fixed lens group G3, satisfy: -0.955 ≤ F8-9-10 / FG3 ≤ -0.293; the focal lengths F11-12-13 of the eleventh lens L11, the twelfth lens L12, and the thirteenth lens L13, and the focal length FG3 of the second fixed lens group G3, satisfy: -2.195 ≤ F11-12-13 / FG3 ≤ 2.009. This reasonable allocation of the optical power of each lens in the second fixed lens group G3 allows light to pass through the lens more smoothly, significantly correcting the impact of higher aberrations on image quality. F8-9-10 is the combined focal length of the eighth lens L8, the ninth lens L9, and the tenth lens L10, and F11-12-13 is the combined focal length of the eleventh lens L11, the twelfth lens L12, and the thirteenth lens L13.

[0076] Optionally, continue to refer to Figure 1 , Figure 2 , Figure 9 , Figure 10 , Figure 17 , Figure 18 , Figure 25 and Figure 26As shown, the focusing lens group G4 includes: a fourteenth lens L14 with positive optical power, a fifteenth lens L15 with positive optical power, and a sixteenth lens L16 with negative optical power. The fifteenth lens L15 and the sixteenth lens L16 are cemented together to form a fifth cemented lens.

[0077] Optionally, the object-side surface of the fourteenth lens L14 is convex, the image-side surface of the fifteenth lens L15 is convex, the object-side surface of the fifteenth lens L15 is convex, and the image-side surface of the sixteenth lens L16 is concave.

[0078] In this system, the fourteenth lens L14 is a convex-convex positive lens, the fifteenth lens L15 is a convex-convex positive lens, and the sixteenth lens L16 is a concave-concave negative lens. During zooming, the focusing lens group G4 moves according to the position change of the zoom lens group G2, ensuring the system remains in focus at different magnifications. Therefore, using a cemented doublet lens in the focusing lens group G4 can significantly optimize chromatic aberration and higher aberrations at different magnifications, reduce the angle of light exit, create a smooth and stable incident image plane, and improve the stability of the lens image.

[0079] Optionally, the zoom lens has an aperture WFNO ≤ 1.86 at the wide-angle end and an aperture TFNO ≤ 1.92 at the telephoto end. The zoom lens maintains the same aperture position relative to the image plane at all focal lengths, and the aperture diameter is the same at all focal lengths.

[0080] Optionally, the refractive index nd7 and Abbe number vd7 of the seventh lens L7 in the second fixed lens group G3 satisfy: 1.795≤nd7≤2.05; 21.00≤vd7≤30.56; and the refractive index nd14 and Abbe number vd14 of the fourteenth lens L14 in the focusing lens group G4 satisfy: 1.770≤nd14≤2.051; 20.36≤vd14≤29.74. The correction of chromatic aberration and advanced aberrations in this zoom lens primarily relies on the cemented lens groups in the second fixed lens group G3 and the focusing lens group G4. Therefore, the material selection for the seventh lens L7 (the first of the three-cemented lenses in the second fixed lens group G3) and the fourteenth lens L14 (the first of the two-cemented lenses in the focusing lens group G4) is crucial. The use of high-refractive-index materials for the seventh lens L7 and the fourteenth lens L14 allows light to converge more effectively into the cemented lens behind them, improving the cemented lens's ability to optimize chromatic aberration and advanced aberrations.

[0081] Optionally, the total length TTL of the zoom lens and the maximum moving distance S2 of the zoom lens group satisfy: 2.681≤TTL / S2≤3.694. The limitation of the zoom lens group G2 and the total length TTL of the lens can compress the lens space, ensuring that the required image quality and zoom level are met while maintaining a small lens size.

[0082] Optionally, the zoom lens consists of sixteen spherical glass elements. Compared to aspherical lenses, spherical lenses require fewer optical parameters to be controlled during manufacturing, are simpler to process, have lower costs, and offer more stable optical performance. Furthermore, glass lenses are not sensitive to temperature; lenses using all-glass lenses exhibit more consistent performance at different temperatures, demonstrating stable performance at both high and low temperatures, thus improving the zoom lens's environmental adaptability.

[0083] Therefore, by setting the focal length configuration between each group as described above, a zoom lens with a focal length of 10-50mm and an image size of 13.1 can be obtained. This zoom lens has the characteristics of large aperture, low distortion, long focal length, and high-definition imaging, and can meet the usage requirements in the 436nm-850nm band under a 1 / 1.2″ target surface.

[0084] The zoom lens proposed in this utility model will be described below using specific embodiments one to four.

[0085] The specific parameters of Examples 1 to 4 are shown in Table 1.

[0086] Table 1. Specific parameters for Examples 1 to 4

[0087]

[0088]

[0089] Example 1

[0090] Figure 1 This is a schematic diagram of the wide-angle end of the zoom lens proposed in Embodiment 1 of this utility model; Figure 2 This is a schematic diagram of the telephoto end of the zoom lens proposed in Embodiment 1 of this utility model. In this embodiment, in the second fixed lens group G3, the eighth lens L8, the ninth lens L9, and the tenth lens L10 are cemented together, and the eleventh lens L11, the twelfth lens L12, and the thirteenth lens L13 are cemented together. Relevant parameters of this zoom lens can be found in Tables 1, 2, and 3.

[0091] The design values ​​for each lens in Example 1 are shown in Table 2.

[0092] Table 2 Design values ​​for the first to sixteenth lenses in the zoom lens of Example 1

[0093]

[0094]

[0095] The surface numbers S1-S28 in Table 2 are numbered according to the surface sequence of each lens. "STO" represents the aperture stop of the lens; IMA represents the image plane; the radius of curvature represents the curvature of the corresponding 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. "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; the refractive index represents the ability of the material between the current surface and the next surface to deflect light; and a blank space indicates that the current position is air and the refractive index is 1.

[0096] Table 3. Parameters of the zoom lens at the wide-angle and telephoto ends in Example 1.

[0097] Wide-angle end telephoto end Zoom interval 1 (mm) 1.309 41.299 Zoom interval 2 (mm) 40.647 0.658 Zoom interval 3 (mm) 5.171 0.2 Zoom interval 4 (mm) 1.399 6.370 Image plane size (mm) Φ13.10 Φ13.10 Focal length (mm) 10 40 Waveband (nm) 436～850 436～850 Total optical length (mm) 125 125

[0098] Figure 3 This is the lateral chromatic aberration curve of the wide-angle end of the zoom lens proposed in Embodiment 1 of this utility model; Figure 4 This is the transverse chromatic aberration curve at the telephoto end of the zoom lens proposed in Embodiment 1 of this utility model. The vertical direction represents the normalized aperture, 0 indicates it is on the optical axis, and the vertex in the transverse direction represents the maximum image height; the dominant wavelength is 546.07nm, and the horizontal direction represents the offset relative to the dominant wavelength, in micrometers (µm). Figure 3 , Figure 4 As can be seen, the transverse chromatic aberration at different wavelengths (blue line represents 436nm, green line represents 487nm, red line represents 546nm, yellow line represents 587nm, and purple line represents 656nm) is controlled within a small range, indicating that the transverse chromatic aberration of the zoom lens at different focal lengths is well controlled and can meet the application requirements under normal conditions.

[0099] Ray fan diagrams are one of the commonly used evaluation methods by optical designers. Figure 5 This is the ray fan diagram of the wide-angle end of the zoom lens proposed in Embodiment 1 of this utility model; Figure 6 This is a ray fan diagram of the telephoto end of the zoom lens proposed in Embodiment 1 of this utility model. In a single image, 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 are focused at the same point on the image plane; the vertical axis in a single image can also represent the maximum dispersion range of the beam on the ideal image plane. The ray fan diagram can not only reflect monochromatic aberrations of different wavelengths but also the magnitude of transverse chromatic aberration. Figure 5 , Figure 6As can be seen, the wavelengths (blue line represents 436nm, green line represents 487nm, red line represents 546nm, yellow line represents 587nm, and purple line represents 656nm) of this zoom lens at different focal lengths and in various fields of view are all well close to the horizontal axis, indicating that the transverse aberration of each wavelength is well corrected. In addition, there is no obvious dispersion in the curves of each color, indicating that this zoom lens also has good correction for chromatic aberration, meeting the usage requirements of this zoom lens.

[0100] Figure 7 This is the axial aberration curve at the wide-angle end of the zoom lens proposed in Embodiment 1 of this utility model. Figure 8 This is the axial aberration curve at the telephoto end of the zoom lens proposed in Embodiment 1 of this utility model. The vertical direction represents the normalized aperture, 0 indicates on the optical axis, and the vertex in the perpendicular direction represents the maximum pupil radius; the dominant wavelength is 546.074nm, and the horizontal direction represents the offset relative to the dominant wavelength, in millimeters (mm). Figure 7 , Figure 8 It can be seen that the axial aberration of the normalized aperture of the zoom lens is controlled within a reasonable range for different wavelengths (blue represents 436nm, green represents 487nm, red represents 546nm, yellow represents 587nm, purple represents 656nm, and light blue represents 850nm). This indicates that the axial chromatic aberration of the zoom lens is well controlled at different focal lengths, meeting the usage requirements.

[0101] Example 2

[0102] Figure 9 This is a schematic diagram of the wide-angle end of the zoom lens proposed in Embodiment 2 of this utility model; Figure 10 This is a schematic diagram of the telephoto end of the zoom lens according to Embodiment 2 of this utility model. In this embodiment, in the second fixed lens group G3, the ninth lens L9 and the tenth lens L10 are cemented together, and the eleventh lens L11, the twelfth lens L12, and the thirteenth lens L13 are cemented together. Relevant parameters of this zoom lens can be found in Tables 1, 4, and 5.

[0103] Table 4. Design values ​​for the first to sixteenth lenses in the zoom lens of Example 2.

[0104]

[0105]

[0106] The surface numbers S1-S29 in Table 4 are assigned according to the surface sequence of each lens. "STO" represents the aperture stop of the lens; IMA represents the image plane; the radius of curvature represents the curvature of the corresponding 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. "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; the refractive index represents the ability of the material between the current surface and the next surface to deflect light; and a blank space indicates that the current position is air and the refractive index is 1.

[0107] Table 5. Parameters of the zoom lens at the wide-angle and telephoto ends in Example 2.

[0108] Wide-angle end telephoto end Zoom interval 1 (mm) 1.788 48.411 Zoom interval 2 (mm) 46.743 0.119 Zoom interval 3 (mm) 4.423 2.233 Zoom interval 4 (mm) 1.339 3.528 Image plane size (mm) Φ13.10 Φ13.10 Focal length (mm) 10 40 Waveband (nm) 436～850 436～850 Total optical length (mm) 125 125

[0109] Figure 11 This is the lateral chromatic aberration curve at the wide-angle end of the zoom lens proposed in Embodiment 2 of this utility model; Figure 12 This is the transverse chromatic aberration curve at the telephoto end of the zoom lens proposed in Embodiment 2 of this utility model. The vertical direction represents the normalized aperture, 0 indicates it is on the optical axis, and the vertex in the transverse direction represents the maximum image height; the dominant wavelength is 546.07nm, and the horizontal direction represents the offset relative to the dominant wavelength, in micrometers (µm). Figure 11 , Figure 12 As can be seen, the transverse chromatic aberration at different wavelengths (blue line represents 436nm, green line represents 487nm, red line represents 546nm, yellow line represents 587nm, and purple line represents 656nm) is controlled within a small range, indicating that the transverse chromatic aberration of the zoom lens at different focal lengths is well controlled and can meet the application requirements under normal conditions.

[0110] Ray fan diagrams are one of the commonly used evaluation methods by optical designers. Figure 13 This is the ray fan diagram of the wide-angle end of the zoom lens proposed in Embodiment 2 of this utility model; Figure 14 This is a ray fan plot of the telephoto end of the zoom lens proposed in Embodiment 2 of this utility model. In a single plot, 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 are focused at the same point on the image plane; the vertical axis in a single image can also represent the maximum dispersion range of the beam on the ideal image plane. The ray fan plot can not only reflect monochromatic aberrations of different wavelengths but also the magnitude of transverse chromatic aberration. Figure 13 , Figure 14As can be seen, the wavelengths (blue line represents 436nm, green line represents 487nm, red line represents 546nm, yellow line represents 587nm, and purple line represents 656nm) of this zoom lens at different focal lengths and in various fields of view are all well close to the horizontal axis, indicating that the transverse aberration of each wavelength is well corrected. In addition, there is no obvious dispersion in the curves of each color, indicating that this zoom lens also has good correction for chromatic aberration, meeting the usage requirements of this zoom lens.

[0111] Figure 15 This is the axial aberration curve at the wide-angle end of the zoom lens proposed in Embodiment 2 of this utility model. Figure 16 This is the axial aberration curve at the telephoto end of the zoom lens proposed in Embodiment 2 of this utility model. The vertical direction represents the normalized aperture, 0 indicates on the optical axis, and the vertex in the perpendicular direction represents the maximum pupil radius; the dominant wavelength is 546.074nm, and the horizontal direction represents the offset relative to the dominant wavelength, in millimeters (mm). Figure 15 , Figure 16 It can be seen that the axial aberration of the normalized aperture of the zoom lens is controlled within a reasonable range for different wavelengths (blue represents 436nm, green represents 487nm, red represents 546nm, yellow represents 587nm, purple represents 656nm, and light blue represents 850nm). This indicates that the axial chromatic aberration of the zoom lens is well controlled at different focal lengths, meeting the usage requirements.

[0112] Example 3

[0113] Figure 17 This is a schematic diagram of the wide-angle end of the zoom lens proposed in Embodiment 3 of this utility model; Figure 18 This is a schematic diagram of the telephoto end of the zoom lens proposed in Embodiment 3 of this utility model. In this embodiment, in the second fixed lens group G3, the eighth lens L8, the ninth lens L9, and the tenth lens L10 are cemented together, and the twelfth lens L12 and the thirteenth lens L13 are cemented together. Relevant parameters of this zoom lens can be found in Tables 1, 6, and 7.

[0114] Table 6. Design values ​​for the first to sixteenth lenses in the zoom lens of Example 3.

[0115]

[0116]

[0117] The surface numbers S1-S28 in Table 6 are numbered according to the surface sequence of each lens. "STO" represents the aperture stop of the lens; IMA represents the image plane; the radius of curvature represents the curvature of the corresponding 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. "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; the refractive index represents the ability of the material between the current surface and the next surface to deflect light; and a blank space indicates that the current position is air and the refractive index is 1.

[0118] Table 7. Parameters of the zoom lens at the wide-angle and telephoto ends in Example 3.

[0119] Wide-angle end telephoto end Zoom interval 1 (mm) 1.683 38.459 Zoom interval 2 (mm) 37.518 0.742 Zoom interval 3 (mm) 6.944 3.106 Zoom interval 4 (mm) 1.404 5.242 Image plane size (mm) Φ13.10 Φ13.10 Focal length (mm) 10 40 Waveband (nm) 436～850 436～850 Total optical length (mm) 125 125

[0120] Figure 19 This is the lateral chromatic aberration curve at the wide-angle end of the zoom lens proposed in Embodiment 3 of this utility model; Figure 20 This is the transverse chromatic aberration curve at the telephoto end of the zoom lens proposed in Embodiment 3 of this utility model. The vertical direction represents the normalized aperture, 0 indicates it is on the optical axis, and the vertex in the transverse direction represents the maximum image height; the dominant wavelength is 546.07nm, and the horizontal direction represents the offset relative to the dominant wavelength, in micrometers (µm). Figure 19 , Figure 20 As can be seen, the transverse chromatic aberration at different wavelengths (blue line represents 436nm, green line represents 487nm, red line represents 546nm, yellow line represents 587nm, and purple line represents 656nm) is controlled within a small range, indicating that the transverse chromatic aberration of the zoom lens at different focal lengths is well controlled and can meet the application requirements under normal conditions.

[0121] Ray fan diagrams are one of the commonly used evaluation methods by optical designers. Figure 21 This is the ray fan diagram of the wide-angle end of the zoom lens proposed in Embodiment 3 of this utility model; Figure 22 This is a ray fan plot of the telephoto end of the zoom lens proposed in Embodiment 3 of this utility model. In a single plot, 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 are focused at the same point on the image plane; the vertical axis in a single image can also represent the maximum dispersion range of the beam on the ideal image plane. The ray fan plot can not only reflect monochromatic aberrations of different wavelengths but also the magnitude of transverse chromatic aberration. Figure 21 , Figure 22As can be seen, the wavelengths (blue line represents 436nm, green line represents 487nm, red line represents 546nm, yellow line represents 587nm, and purple line represents 656nm) of this zoom lens at different focal lengths and in various fields of view are all well close to the horizontal axis, indicating that the transverse aberration of each wavelength is well corrected. In addition, there is no obvious dispersion in the curves of each color, indicating that this zoom lens also has good correction for chromatic aberration, meeting the usage requirements of this zoom lens.

[0122] Figure 23 This is the axial aberration curve at the wide-angle end of the zoom lens proposed in Embodiment 3 of this utility model. Figure 24 This is the axial aberration curve at the telephoto end of the zoom lens proposed in Embodiment 3 of this utility model. The vertical direction represents the normalized aperture, 0 indicates on the optical axis, and the vertex in the perpendicular direction represents the maximum pupil radius; the dominant wavelength is 546.074nm, and the horizontal direction represents the offset relative to the dominant wavelength, in millimeters (mm). Figure 23 , Figure 24 It can be seen that the axial aberration of the normalized aperture from 0.3 to 1.0 is controlled within a reasonable range for different wavelengths (blue represents 436nm, green represents 487nm, red represents 546nm, yellow represents 587nm, purple represents 656nm, and light blue represents 850nm). This indicates that the axial chromatic aberration of the zoom lens at different focal lengths is well controlled and meets the usage requirements.

[0123] Example 4

[0124] Figure 25 This is a schematic diagram of the wide-angle end of the zoom lens proposed in Embodiment 4 of this utility model; Figure 26 This is a schematic diagram of the telephoto end of the zoom lens proposed in Embodiment 4 of this utility model. In this embodiment, in the second fixed lens group G3, the eighth lens L8, the ninth lens L9, and the tenth lens L10 are cemented together, and the eleventh lens L11, the twelfth lens L12, and the thirteenth lens L13 are cemented together. Relevant parameters of this zoom lens can be found in Tables 1, 8, and 9.

[0125] Table 8. Design values ​​for the first to sixteenth lenses in the zoom lens of Example 4.

[0126]

[0127]

[0128] The surface numbers S1-S28 in Table 8 are numbered according to the surface sequence of each lens. "STO" represents the aperture stop of the lens; IMA represents the image plane; the radius of curvature represents the curvature of the corresponding 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. "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; the refractive index represents the ability of the material between the current surface and the next surface to deflect light; and a blank space indicates that the current position is air and the refractive index is 1.

[0129] Table 9. Parameters of the zoom lens at the wide-angle and telephoto ends in Example 4.

[0130] Wide-angle end telephoto end Zoom interval 1 (mm) 1.238 35.080 Zoom interval 2 (mm) 34.564 0.722 Zoom interval 3 (mm) 4.911 4.849 Zoom interval 4 (mm) 1.123 1.185 Image plane size (mm) Φ13.10 Φ13.10 Focal length (mm) 15 50 Waveband (nm) 436～850 436～850 Total optical length (mm) 125 125

[0131] Figure 27 This is the lateral chromatic aberration curve of the wide-angle end of the zoom lens proposed in Embodiment 4 of this utility model; Figure 28 This is the transverse chromatic aberration curve at the telephoto end of the zoom lens proposed in Embodiment 4 of this utility model. The vertical direction represents the normalized aperture, 0 indicates it is on the optical axis, and the vertex in the transverse direction represents the maximum image height; the dominant wavelength is 546.07nm, and the horizontal direction represents the offset relative to the dominant wavelength, in micrometers (µm). Figure 27 , Figure 28 As can be seen, the transverse chromatic aberration at different wavelengths (blue line represents 436nm, green line represents 487nm, red line represents 546nm, yellow line represents 587nm, and purple line represents 656nm) is controlled within a small range, indicating that the transverse chromatic aberration of the zoom lens at different focal lengths is well controlled and can meet the application requirements under normal conditions.

[0132] Ray fan diagrams are one of the commonly used evaluation methods by optical designers. Figure 29 This is the ray fan diagram of the wide-angle end of the zoom lens proposed in Embodiment 4 of this utility model; Figure 30 This is a ray fan diagram of the telephoto end of the zoom lens proposed in Embodiment 4 of this utility model. In a single image, 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 are focused at the same point on the image plane; the vertical axis in a single image can also represent the maximum dispersion range of the beam on the ideal image plane. The ray fan diagram can not only reflect monochromatic aberrations of different wavelengths but also the magnitude of transverse chromatic aberration. Figure 29 , Figure 30As can be seen, the wavelengths (blue line represents 436nm, green line represents 487nm, red line represents 546nm, yellow line represents 587nm, and purple line represents 656nm) of this zoom lens at different focal lengths and in various fields of view are all well close to the horizontal axis, indicating that the transverse aberration of each wavelength is well corrected. In addition, there is no obvious dispersion in the curves of each color, indicating that this zoom lens also has good correction for chromatic aberration, meeting the usage requirements of this zoom lens.

[0133] Figure 31 The axial aberration curve at the wide-angle end of the zoom lens proposed in Embodiment 4 of this utility model Figure 32 The axial aberration curve at the telephoto end of the zoom lens proposed in Embodiment 4 of this utility model. The vertical direction represents the normalized aperture, 0 indicates on the optical axis, and the vertex in the perpendicular 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 31 , Figure 32 It can be seen that the axial aberration of the normalized aperture of the zoom lens is controlled within a reasonable range for different wavelengths (blue represents 436nm, green represents 487nm, red represents 546nm, yellow represents 587nm, purple represents 656nm, and light blue represents 850nm). This indicates that the axial chromatic aberration of the zoom lens is well controlled at different focal lengths, meeting the usage requirements.

[0134] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. 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 utility model should be included within the scope of protection of this utility model.

Claims

1. A zoom lens, characterized in that, include: Along the optical axis from the object side to the image side are arranged the following components in sequence: a first fixed lens group with positive optical power, a zoom lens group with negative optical power, an aperture stop, a second fixed lens group with positive optical power, a focusing lens group with positive optical power, and a flat glass plate. The relationship between the focal length F1 of the first fixed lens group, the focal length F2 of the zoom lens group, the focal length F3 of the second fixed lens group, the focal length F4 of the focusing lens group, and the focal length FW at the wide-angle end of the zoom lens satisfies: 5.249≤F1 / FW≤10.778; -2.802≤F2 / FW≤-1.762; 2.586≤F3 / FW≤4.771; 1.425≤F4 / FW≤2.

653.

2. The zoom lens according to claim 1, characterized in that, The first fixed lens group includes: a first lens with negative optical power, a second lens with positive optical power, and a third lens with positive optical power, wherein the first lens and the second lens are cemented together to form a first cemented lens.

3. The zoom lens according to claim 2, characterized in that, The first lens has a convex object-side surface and a concave image-side surface; the second lens has a convex object-side surface and a concave image-side surface; and the third lens has a convex object-side surface and a concave image-side surface.

4. The zoom lens according to claim 1, characterized in that, The zoom lens group includes: a fourth lens with negative optical power, a fifth lens with negative optical power, and a sixth lens with positive optical power, wherein the fifth lens and the sixth lens are cemented together to form a second cemented lens.

5. The zoom lens according to claim 4, characterized in that, The fourth lens has a concave object side and a concave image side; the fifth lens has a concave object side and a concave image side; and the sixth lens has a convex object side and a concave image side.

6. The zoom lens according to claim 1, characterized in that, The second fixed lens group includes: a seventh lens with positive optical power, an eighth lens with negative optical power, a ninth lens with positive optical power, a tenth lens with negative optical power, an eleventh lens with positive optical power, a twelfth lens with negative optical power, and a thirteenth lens with positive optical power. At least two of the eighth, ninth, and tenth lenses are cemented together to form a third cemented lens, and at least two of the eleventh, twelfth, and thirteenth lenses are cemented together to form a fourth cemented lens.

7. The zoom lens according to claim 6, characterized in that, The object-side surface of the seventh lens is convex, and the image-side surface is convex. The object-side surface of the eighth lens is concave, and the image-side surface is concave. The object-side surface of the ninth lens is convex, and the image-side surface is convex. The object-side surface of the tenth lens is concave, and the image-side surface is concave. The object-side surface of the eleventh lens is convex, and the image-side surface is convex. The object-side surface of the twelfth lens is concave, and the image-side surface is concave. The object-side surface of the thirteenth lens is convex, and the image-side surface is convex.

8. The zoom lens according to claim 6, characterized in that, The focal lengths F8-9-10 of the eighth lens, the ninth lens, and the tenth lens satisfy the following condition: -0.955≤F8-9-10 / FG3≤-0.293; The focal lengths F11-12-13 of the eleventh lens, the twelfth lens, and the thirteenth lens satisfy the following condition: -2.195≤F11-12-13 / FG3≤2.

009.

9. The zoom lens according to claim 1, characterized in that, The focusing lens group includes: a fourteenth lens with positive optical power, a fifteenth lens with positive optical power, and a sixteenth lens with negative optical power, wherein the fifteenth lens and the sixteenth lens are cemented together to form a fifth cemented lens.

10. The zoom lens according to claim 9, characterized in that, The object-side surface of the fourteenth lens is convex, and the image-side surface is convex; the object-side surface of the fifteenth lens is convex, and the image-side surface is convex; the object-side surface of the sixteenth lens is concave, and the image-side surface is concave.

11. The zoom lens according to claim 1, characterized in that, The zoom lens has an aperture of WFNO ≤ 1.86 at the wide-angle end and an aperture of TFNO ≤ 1.92 at the telephoto end.

12. The zoom lens according to claim 1, characterized in that, The refractive index nd7 and Abbe number vd7 of the seventh lens in the second fixed lens group satisfy: 1.795≤nd7≤2.05; 21.00≤vd7≤30.56; The refractive index nd14 and Abbe number vd14 of the fourteenth lens in the focusing lens group satisfy: 1.770≤nd14≤2.051; 20.36≤vd14≤29.

74.

13. The zoom lens according to claim 1, characterized in that, The total length TTL of the zoom lens and the maximum moving distance S2 of the zoom lens group satisfy the following: 2.681≤TTL / S2≤3.694.

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