A zoom lens

Abstract

The invention discloses a zoom lens, comprising: a first fixed lens group with positive focal power, a variable power lens group with negative focal power, an aperture, a second fixed lens group with positive focal power, a focus lens group with positive focal power and a flat glass are arranged in sequence from the object side to the image side along the optical axis; the relationship between the focal length F1 of the first fixed lens group, the focal length F2 of the variable power lens group, the focal length F3 of the second fixed lens group, the focal length F4 of the focus 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. The zoom lens has the characteristics of large aperture, small distortion, long focal length and high-definition imaging, and can meet the use requirements under the 1 / 1.2″ target surface and the 436nm-850nm band.

Description

Technical Field

[0001] The present invention relates to the technical field of optical lenses, and in particular to a zoom lens. Background Art

[0002] ITS (Intelligent Transportation System) lens is a lens specially designed for image sensors. ITS lens usually has the characteristics of high resolution, low distortion, high contrast, etc., and can provide clear, accurate, high-quality images. Its design takes into account the optical characteristics, mechanical structure and electronic interface, and can effectively adapt to various complex environments.

[0003] Currently, most of the ITS lenses commonly used on the market are fixed-focus lenses with low image quality and poor tolerance in harsh environments. Faced with more complex usage environments, zoom lenses have gradually become the new favorite in the ITS field, but the types of zoom lenses for the ITS field on the market are extremely limited, and there are problems such as low image quality, too small focal length range, and large distortion, which have certain difficulties in practical application. Summary of the invention

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

[0005] To achieve the above object, an embodiment of the present invention provides a zoom lens, comprising: a first fixed lens group with positive optical power, a variable magnification 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 are arranged in sequence from the object side to the image side along the optical axis;

[0006] The relationship between the focal length F1 of the first fixed lens group, the focal length F2 of the variable power 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 zoom lens at the wide angle end 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, and the first lens and the second lens are glued together to form a first glued 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 variable power 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, and 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, and the image side surface is concave, the object side surface of the fifth lens is concave, and the image side surface 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 lens, the ninth lens and the tenth lens are glued to form a third glued lens, and at least two of the eleventh lens, the twelfth lens and the thirteenth lens are glued to form a fourth glued lens.

[0013] Optionally, 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, and the object side surface of the thirteenth lens is convex, and the image side surface is convex.

[0014] Optionally, the focal lengths F8-9-10 of the eighth lens, the ninth lens and the tenth lens and the focal length FG3 of the second fixed lens group satisfy:

[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 and the focal length FG3 of the second fixed lens group satisfy:

[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 negative optical power and a sixteenth lens with negative optical power, and 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, and the image side surface is convex, the object side surface of the fifteenth lens is convex, and the image side surface is convex, and the object side surface of the sixteenth lens is concave, and the image side surface is concave.

[0020] 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.

[0021] Optionally, the refractive index nd7 and the 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 the 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 variable magnification lens group satisfy:

[0026] 2.681≤TTL / S2≤3.694.

[0027] A zoom lens provided according to an embodiment of the present invention comprises: a first fixed lens group with positive optical power, a variator lens group with negative optical power, an aperture, a second fixed lens group with positive optical power, a focus lens group with positive optical power, and a flat glass are arranged in sequence along an optical axis from an object side to an image side; wherein the relationship between the focal length F1 of the first fixed lens group, the focal length F2 of the variator lens group, the focal length F3 of the second fixed lens group, the focal length F4 of the focus lens group and the focal length FW of the wide-angle end of the zoom lens satisfies the following: 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 setting the focal length configuration between each group as described above, a zoom lens with a focal length of 10-50mm and an image plane size of 13.1 can be obtained. The zoom lens has the characteristics of large aperture, small distortion, long focal length and high-definition imaging, and can meet the use requirements in the 436nm-850nm band under a 1 / 1.2″ target surface.

[0028] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 is a schematic structural diagram of the wide-angle end of the zoom lens provided in the first embodiment of the present invention;

[0031] Figure 2 is a schematic structural diagram of the telephoto end of the zoom lens provided in the first embodiment of the present invention;

[0032] Figure 3 is a vertical axis chromatic aberration curve at the wide-angle end of the zoom lens proposed in the first embodiment of the present invention;

[0033] Figure 4 is a vertical axis chromatic aberration curve at the telephoto end of the zoom lens proposed in the first embodiment of the present invention;

[0034] Figure 5 is a light fan diagram of the wide-angle end of the zoom lens provided in the first embodiment of the present invention;

[0035] Figure 6 is a light fan diagram of the light rays at the telephoto end of the zoom lens proposed in the first embodiment of the present invention;

[0036] Figure 7 is an axial aberration curve at the wide-angle end of the zoom lens provided in the first embodiment of the present invention;

[0037] Figure 8 is an axial aberration curve at the telephoto end of the zoom lens proposed in Embodiment 1 of the present invention;

[0038] Fig. 9 is a schematic structural diagram of the wide-angle end of the zoom lens provided in the second embodiment of the present invention;

[0039] Fig.10 is a schematic structural diagram of the telephoto end of the zoom lens provided in the second embodiment of the present invention;

[0040] Fig.11 is a vertical axis chromatic aberration curve at the wide-angle end of the zoom lens proposed in the second embodiment of the present invention;

[0041] Fig.12is a vertical axis chromatic aberration curve at the telephoto end of the zoom lens proposed in the second embodiment of the present invention;

[0042] Fig.13 is a light fan diagram of the wide-angle end of the zoom lens proposed in the second embodiment of the present invention;

[0043] Fig.14 is a light fan diagram of the light rays at the telephoto end of the zoom lens proposed in the second embodiment of the present invention;

[0044] Fig.15 is an axial aberration curve at the wide-angle end of the zoom lens proposed in Embodiment 2 of the present invention;

[0045] Fig.16 is an axial aberration curve at the telephoto end of the zoom lens proposed in Embodiment 2 of the present invention;

[0046] Fig.17 is a schematic structural diagram of the wide-angle end of the zoom lens provided in Embodiment 3 of the present invention;

[0047] Fig.18 is a schematic structural diagram of the telephoto end of the zoom lens provided in Embodiment 3 of the present invention;

[0048] Fig.19 is a vertical axis chromatic aberration curve at the wide-angle end of the zoom lens proposed in Embodiment 3 of the present invention;

[0049] Fig. 20 is a vertical axis chromatic aberration curve at the telephoto end of the zoom lens proposed in the third embodiment of the present invention;

[0050] Fig.21 is a light fan diagram of the wide-angle end of the zoom lens proposed in the third embodiment of the present invention;

[0051] Fig. 22 is a light fan diagram of the light at the telephoto end of the zoom lens proposed in the third embodiment of the present invention;

[0052] Fig.23 is an axial aberration curve at the wide-angle end of the zoom lens proposed in Embodiment 3 of the present invention;

[0053] Fig.24 is an axial aberration curve at the telephoto end of the zoom lens proposed in Embodiment 3 of the present invention;

[0054] Fig.25 is a schematic structural diagram of the wide-angle end of the zoom lens provided in Embodiment 4 of the present invention;

[0055] Fig.26 is a schematic structural diagram of the telephoto end of the zoom lens provided in the fourth embodiment of the present invention;

[0056] Fig. 27is a vertical axis chromatic aberration curve at the wide-angle end of the zoom lens proposed in Embodiment 4 of the present invention;

[0057] Fig.28 is a vertical axis chromatic aberration curve at the telephoto end of the zoom lens proposed in the fourth embodiment of the present invention;

[0058] Fig.29 is a light fan diagram of the wide-angle end of the zoom lens provided in the fourth embodiment of the present invention;

[0059] Fig.30 is a light fan diagram of the light at the telephoto end of the zoom lens proposed in the fourth embodiment of the present invention;

[0060] Fig.31 is an axial aberration curve at the wide-angle end of the zoom lens proposed in Embodiment 4 of the present invention;

[0061] Fig.32 This is the axial aberration curve at the telephoto end of the zoom lens proposed in the fourth embodiment of the present invention. DETAILED DESCRIPTION

[0062] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0063] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0064] Figure 1 , Fig. 9 , Fig.17 and Fig.25 A schematic diagram of the structure of the zoom lens at the wide-angle end provided by various embodiments of the present invention, Figure 2 , Fig.10 , Fig.18 and Fig.26Schematic diagram of the structure of the zoom lens at the telephoto end provided by various embodiments of the present invention. Figure 1 , Figure 2 , Fig. 9 , Fig.10 , Fig.17 , Fig.18 , Fig.25 and Fig.26 As shown, the zoom lens provided by the embodiment of the present invention includes: a first fixed lens group G1 with positive optical focal power, a variator lens group G2 with negative optical focal power, an aperture STO, a second fixed lens group G3 with positive optical focal power, a focusing lens group G4 with positive optical focal power and a flat glass PL are arranged in sequence along the optical axis from the object side to the image side; the relationship between the focal length F1 of the first fixed lens group G1, the focal length F2 of the variator 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 of the zoom lens at the wide-angle end 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] It can be understood that by setting the first fixed lens group G1, the variable magnification lens group G2, the second fixed lens group G3, and the focusing lens group G4, the positions of the variable magnification lens group G2 and the focusing lens group G4 on the optical axis are changed, so that the zoom lens can be switched between the wide-angle end and the telephoto end. The use of the first fixed lens group G1 with positive focal length and the variable magnification lens group G2 with negative focal length at the front end of the aperture STO can ensure that a larger light aperture is generated after the light passes through, increase the F number of the zoom lens, and meet the use requirements under different conditions. In addition, the first fixed lens group G1 and the variable magnification lens group G2 can correct the high-level chromatic aberration and aberration of the lens, control the aberration balance of each group, ensure that no serious aberration is generated when the light enters the structure after the aperture STO, and improve the imaging quality of the zoom lens. The second fixed lens group G3 and the focusing lens group G4 after the aperture STO can correct the aberration at the rear end of the lens, and cooperate with the lens group at the front end of the aperture to stabilize the imaging quality of the zoom lens. In addition, controlling the aperture diameter of the lens at different focal lengths to be the same can reduce the aperture range from a structural perspective, ensure that the movable group of the lens has a longer travel distance, achieve a higher imaging magnification or reduce the volume, and meet the use requirements under different conditions. Furthermore, by matching the focal power of the four groups of lenses as positive-negative-positive-positive, the focal power of each group and the focal power of the components within the group are reasonably allocated, so that light passes through the lens more smoothly, and the influence of high-level aberrations on the imaging quality is corrected to a large extent. The lens effectively achieves small distortion and high-definition imaging, and also ensures that the lens has a relatively compact total length. The zoom lens comprehensively takes into account the characteristics of zoom, large aperture, low distortion and compact structure.

[0066] Optionally, continue to refer to Figure 1 , Figure 2 , Fig. 9 , Fig.10 , Fig.17 , Fig.18 , Fig.25 and Fig.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] Among them, the first fixed lens group G1 uses a first cemented lens, which can correct the high-order chromatic aberration and aberration of the zoom lens. The first lens L1 is a convex-concave negative lens, which can allow more light to enter the zoom lens, the second lens L2 is a convex-concave positive lens, and the third lens L3 is a convex-concave positive lens, and the second lens L2 and the third lens L3 are cemented, which can correct the direction of light entering the zoom lens.

[0069] Optionally, continue to refer to Figure 1 , Figure 2 , Fig. 9 , Fig.10 , Fig.17 , Fig.18 , Fig.25 and Fig.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, and the image-side surface is concave, the object-side surface of the fifth lens L5 is concave, and the image-side surface is concave, and the object-side surface of the sixth lens L6 is convex, and the image-side surface is concave.

[0071] Among them, the second cemented lens in the zoom lens group G2 cooperates with the first cemented lens in the first fixed lens group G1 to correct the high-order chromatic aberration and aberration of the zoom lens. In addition, 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. The negative lens can diffuse the light, and the positive lens can focus the light.

[0072] Optionally, continue to refer to Figure 1 , Figure 2 , Fig. 9 , Fig.10 , Fig.17 , Fig.18 , Fig.25 and Fig.26 As shown, the second fixed lens group G2 includes: a seventh lens L7 with positive focal power, an eighth lens L8 with negative focal power, a ninth lens L9 with positive focal power, a tenth lens L10 with negative focal power, an eleventh lens L11 with positive focal power, a twelfth lens L12 with negative focal power and a thirteenth lens L13 with positive focal power, at least two of the eighth lens L8, the ninth lens L9 and the tenth lens L10 are cemented 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 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] Among them, 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. Among them, at least two lenses of the eighth lens L8, the ninth lens L9 and the tenth lens L10 are glued to form a third glued lens, and at least two lenses of the eleventh lens L11, the twelfth lens L12 and the thirteenth lens L13 are glued to form a fourth glued lens. Through the use of glued lenses, the total length of the lens can be effectively shortened, and the second fixed lens group G3 is immediately behind the aperture STO, and the aperture STO can limit the light of different incident angles so that it can enter the second fixed lens group G3 more concentratedly and smoothly. Therefore, the use of two glued lens groups on the second fixed lens group G3 can well correct the chromatic aberration and high-order aberrations generated by the front lens group, make up for the deficiency that the lens does not contain aspherical lenses, and improve the imaging quality of the overall lens 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. Among them, the focal power of each lens in the second fixed lens group G3 is reasonably allocated, so that the light passes through the lens more smoothly, and the influence of high-order aberrations on the imaging quality is corrected to a great extent. 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 , Fig. 9 , Fig.10 , Fig.17 , Fig.18 , Fig.25 and Fig.26 As shown, the focusing lens group G4 includes: a fourteenth lens L14 with positive optical power, a fifteenth lens L15 with negative 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, and the image-side surface is convex, the object-side surface of the fifteenth lens L15 is convex, and the image-side surface is convex, and the object-side surface of the sixteenth lens L16 is concave, and the image-side surface is concave.

[0078] Among them, the fourteenth lens L14 is a convex-convex positive lens, the fifteenth lens L15 is a convex-convex negative lens, and the sixteenth lens L16 is a concave-concave negative lens. During the zooming process of the zoom lens, the focus lens group G4 will move according to the position change of the zoom lens group G2 so that the system can be in a focusing state at different magnifications. Therefore, using a double-cemented lens in the focus lens group G4 can greatly optimize the chromatic aberration and high-order aberration at different magnification focus positions, reduce the exit angle of light, make it smooth and stable incident image plane, and improve the stability of lens imaging.

[0079] Optionally, the aperture WFNO of the zoom lens at the wide-angle end is ≤1.86, and the aperture TFNO at the telephoto end is ≤1.92. The aperture position of the zoom lens at different focal lengths remains consistent relative to the image plane position, and the aperture diameter is the same at different 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; 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. Among them, the correction of chromatic aberration and higher-order aberration of the zoom lens mainly depends on the cemented lens group in the second fixed lens group G3 and the focusing lens group G4, so the material selection of the seventh lens L7, the first lens of the three-cemented lens in the second fixed lens group G3, and the fourteenth lens L14, the first lens of the double-cemented lens in the focusing lens group G4, is very important. The seventh lens L7 and the fourteenth lens L14 are made of materials with high refractive indexes, so that light can be more concentrated into the rear cemented lens, thereby improving the cemented lens's ability to optimize chromatic aberration and higher-order 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 and ensure that the required imaging quality and zoom degree are met under the condition of small lens volume.

[0082] Optionally, the zoom lens is composed of sixteen glass spherical lenses. Compared with aspherical lenses, spherical lenses require fewer optical parameters to be controlled during the production process, are simpler to process, have lower costs, and have more stable optical performance. In addition, the properties of glass lenses are not sensitive to temperature. Lenses using all-glass lenses have more uniform performance under different temperature conditions, have the characteristics of stable high and low temperature performance, and improve the environmental adaptability of the zoom lens.

[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 plane size of 13.1 can be obtained. The zoom lens has the characteristics of large aperture, small distortion, long focal length and high-definition imaging, and can meet the use requirements in the 436nm-850nm band under a 1 / 1.2″ target surface.

[0084] The zoom lens provided by the present invention is described below with reference to specific embodiments 1 to 4.

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

[0086] Table 1 Specific parameters of Examples 1 to 4

[0087]

[0088]

[0089] Embodiment 1

[0090] Figure 1 is a schematic structural diagram of the wide-angle end of the zoom lens provided in the first embodiment of the present invention; Figure 2 : is a schematic diagram of the structure of the telephoto end of the zoom lens proposed in the first embodiment of the present invention. 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. The relevant parameters of the zoom lens can be referred to as shown in Table 1, Table 2 and Table 3.

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

[0092] Table 2 Design values ​​of 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 order of each lens, "STO" represents the aperture of the lens; IMA represents the image plane; the radius of curvature represents the curvature of the corresponding lens surface, a positive value represents that the surface is bent toward the image plane, and a negative value represents that the surface is bent toward the object plane, wherein "INF" represents that the surface is a plane and the radius of curvature is infinite; the thickness represents the central axial distance from the current surface to 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 space represents that the current position is air and the refractive index is 1.

[0096] Table 3 Parameters of the zoom lens at the wide-angle end and the telephoto end 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 size(mm) Φ13.10 Φ13.10 Focal length(mm) 10 40 Wavelength(nm) 436～850 436～850 Total optical length (mm) 125 125

[0098] Figure 3 is a vertical axis chromatic aberration curve at the wide-angle end of the zoom lens proposed in the first embodiment of the present invention; Figure 4 This is the vertical axis chromatic aberration curve of the zoom lens at the telephoto end proposed in the first embodiment of the present invention. The vertical direction represents the normalization of the aperture, 0 represents the optical axis, and the vertex in the vertical axis represents the maximum image height. The main wavelength uses 546.07nm, and the horizontal direction represents the offset relative to the main wavelength, in micrometers (um). Figure 3 , Figure 4It can be seen that the vertical chromatic aberration of different wavelengths (the blue line represents 436nm, the green line represents 487nm, the red line represents 546nm, the yellow line represents 587nm, and the purple line represents 656nm) is controlled within a small range, indicating that the vertical chromatic aberration of the zoom lens at different focal lengths is well controlled and can meet the application requirements under normal conditions.

[0099] The ray fan diagram is one of the evaluation methods commonly used by optical designers. Figure 5 is a light fan diagram of the wide-angle end of the zoom lens provided in the first embodiment of the present invention; Figure 6 It is a light fan diagram of the telephoto end of the zoom lens proposed in Example 1 of the present invention. In a single diagram, the horizontal axis is the normalized light beam diameter, and the vertical axis is the vertical axis aberration. Ideally, each curve should completely coincide with the horizontal axis, at which time all light rays in the field of view are focused on the same point on the image plane; the vertical axis in a single image can also be expressed as the maximum dispersion range of the light beam on the ideal image plane. The light fan diagram can not only reflect the monochromatic aberrations of different wavelengths, but also indicate the size of the vertical axis chromatic aberration. By Figure 5 , Figure 6 It can be seen that the wavelengths of this zoom lens at different focal lengths and fields of view (blue line represents 436nm, green line represents 487nm, red line represents 546nm, yellow line represents 587nm, and purple line represents 656nm) are all close to the horizontal axis, indicating that the vertical axis aberration of each wavelength is well corrected. In addition, the curves of each color are not obviously scattered, indicating that this zoom lens also has good correction of chromatic aberration, meeting the use requirements of this zoom lens.

[0100] Figure 7 is the axial aberration curve at the wide-angle end of the zoom lens proposed in the first embodiment of the present invention, Figure 8 It is the axial aberration curve of the telephoto end of the zoom lens proposed in the first embodiment of the present invention. The vertical direction represents the normalization of the aperture, 0 represents the optical axis, and the vertex in the vertical axis direction represents the maximum pupil radius; the main wavelength uses 546.074nm, and the horizontal direction represents the offset relative to the main wavelength, in millimeters (mm). Figure 7 , Figure 8 It can be seen that the axial aberrations of different wavelengths (blue represents 436nm, green represents 487nm, red represents 546nm, yellow represents 587nm, purple represents 656nm, and light blue represents 850nm) and the normalized aperture of 0.3 to 1.0 are all controlled within a reasonable range, indicating that the axial chromatic aberration of the zoom lens at different focal lengths is well controlled and meets the usage requirements.

[0101] Embodiment 2

[0102] Fig. 9 is a schematic structural diagram of the wide-angle end of the zoom lens provided in the second embodiment of the present invention; Fig.10 : is a schematic diagram of the structure of the telephoto end of the zoom lens proposed in the second embodiment of the present invention. 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. The relevant parameters of the zoom lens can be referred to as shown in Table 1, Table 4 and Table 5.

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

[0104]

[0105]

[0106] The surface numbers S1-S29 in Table 4 are numbered according to the surface order of each lens, "STO" represents the aperture of the lens; IMA represents the image plane; the radius of curvature represents the curvature of the corresponding lens surface, a positive value represents that the surface is bent toward the image plane, and a negative value represents that the surface is bent toward the object plane, wherein "INF" represents that the surface is a plane and the radius of curvature is infinite; the thickness represents the central axial distance from the current surface to 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 space represents that the current position is air and the refractive index is 1.

[0107] Table 5 Parameters of the zoom lens at the wide-angle end and the telephoto end 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 size(mm) Φ13.10 Φ13.10 Focal length(mm) 10 40 Wavelength(nm) 436～850 436～850 Total optical length (mm) 125 125

[0109] Fig.11 is a vertical axis chromatic aberration curve at the wide-angle end of the zoom lens proposed in the second embodiment of the present invention; Fig.12 This is the vertical axis chromatic aberration curve of the zoom lens at the telephoto end proposed in the second embodiment of the present invention. The vertical direction represents the normalization of the aperture, 0 represents the optical axis, and the vertex in the vertical axis represents the maximum image height. The main wavelength uses 546.07nm, and the horizontal direction represents the offset relative to the main wavelength, in micrometers (um). Fig.11 , Fig.12 It can be seen that the vertical chromatic aberration of different wavelengths (the blue line represents 436nm, the green line represents 487nm, the red line represents 546nm, the yellow line represents 587nm, and the purple line represents 656nm) is controlled within a small range, indicating that the vertical chromatic aberration of the zoom lens at different focal lengths is well controlled and can meet the application requirements under normal conditions.

[0110] The ray fan diagram is one of the evaluation methods commonly used by optical designers. Fig.13 is a light fan diagram of the wide-angle end of the zoom lens proposed in the second embodiment of the present invention; Fig.14It is the light fan diagram of the telephoto end of the zoom lens proposed in Example 2 of the present invention. In a single diagram, the horizontal axis is the normalized light beam diameter, and the vertical axis is the vertical axis aberration. Ideally, each curve should completely coincide with the horizontal axis, at which time all light rays in the field of view are focused on the same point on the image plane; the vertical axis in a single image can also be expressed as the maximum dispersion range of the light beam on the ideal image plane. The light fan diagram can not only reflect the monochromatic aberrations of different wavelengths, but also indicate the size of the vertical axis chromatic aberration. By Fig.13 , Fig.14 It can be seen that the wavelengths of this zoom lens at different focal lengths and fields of view (blue line represents 436nm, green line represents 487nm, red line represents 546nm, yellow line represents 587nm, and purple line represents 656nm) are all close to the horizontal axis, indicating that the vertical axis aberration of each wavelength is well corrected. In addition, the curves of each color are not obviously scattered, indicating that this zoom lens also has good correction of chromatic aberration, meeting the use requirements of this zoom lens.

[0111] Fig.15 is the axial aberration curve at the wide-angle end of the zoom lens proposed in the second embodiment of the present invention, Fig.16 It is the axial aberration curve of the telephoto end of the zoom lens proposed in the second embodiment of the present invention. The vertical direction represents the normalization of the aperture, 0 represents the optical axis, and the vertex in the vertical axis direction represents the maximum pupil radius; the main wavelength uses 546.074nm, and the horizontal direction represents the offset relative to the main wavelength, in millimeters (mm). Fig.15 , Fig.16 It can be seen that the axial aberrations of different wavelengths (blue represents 436nm, green represents 487nm, red represents 546nm, yellow represents 587nm, purple represents 656nm, and light blue represents 850nm) and the normalized aperture of 0.3 to 1.0 are all controlled within a reasonable range, indicating that the axial chromatic aberration of the zoom lens at different focal lengths is well controlled and meets the usage requirements.

[0112] Embodiment 3

[0113] Fig.17 is a schematic structural diagram of the wide-angle end of the zoom lens provided in Embodiment 3 of the present invention; Fig.18 : is a schematic diagram of the structure of the telephoto end of the zoom lens proposed in the third embodiment of the present invention. 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. The relevant parameters of the zoom lens can be referred to as shown in Table 1, Table 6 and Table 7.

[0114] Table 6 Design values ​​of 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 order of each lens, "STO" represents the aperture of the lens; IMA represents the image plane; the radius of curvature represents the curvature of the corresponding lens surface, a positive value represents that the surface is bent toward the image plane, and a negative value represents that the surface is bent toward the object plane, wherein "INF" represents that the surface is a plane and the radius of curvature is infinite; the thickness represents the central axial distance from the current surface to 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 space represents that the current position is air and the refractive index is 1.

[0118] Table 7 Parameters of the zoom lens at the wide-angle end and the telephoto end 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 size(mm) Φ13.10 Φ13.10 Focal length(mm) 10 40 Wavelength (nm) 436～850 436～850 Total optical length (mm) 125 125

[0120] Fig.19 is a vertical axis chromatic aberration curve at the wide-angle end of the zoom lens proposed in Embodiment 3 of the present invention; Fig. 20 This is the vertical axis chromatic aberration curve of the zoom lens at the telephoto end proposed in the third embodiment of the present invention. The vertical direction represents the normalization of the aperture, 0 represents the optical axis, and the vertex in the vertical axis represents the maximum image height. The main wavelength uses 546.07nm, and the horizontal direction represents the offset relative to the main wavelength, in micrometers (um). Fig.19 , Fig. 20 It can be seen that the vertical chromatic aberration of different wavelengths (the blue line represents 436nm, the green line represents 487nm, the red line represents 546nm, the yellow line represents 587nm, and the purple line represents 656nm) is controlled within a small range, indicating that the vertical chromatic aberration of the zoom lens at different focal lengths is well controlled and can meet the application requirements under normal conditions.

[0121] The ray fan diagram is one of the evaluation methods commonly used by optical designers. Fig.21 is a light fan diagram of the wide-angle end of the zoom lens proposed in the third embodiment of the present invention; Fig. 22 It is the light fan diagram of the telephoto end of the zoom lens proposed in Example 3 of the present invention. In a single diagram, the horizontal axis is the normalized light beam diameter, and the vertical axis is the vertical axis aberration. Ideally, each curve should completely coincide with the horizontal axis, at which time all light rays in the field of view are focused on the same point on the image plane; the vertical axis in a single image can also be expressed as the maximum dispersion range of the light beam on the ideal image plane. The light fan diagram can not only reflect the monochromatic aberrations of different wavelengths, but also indicate the size of the vertical axis chromatic aberration. By Fig.21 , Fig. 22It can be seen that the wavelengths of this zoom lens at different focal lengths and fields of view (blue line represents 436nm, green line represents 487nm, red line represents 546nm, yellow line represents 587nm, and purple line represents 656nm) are all close to the horizontal axis, indicating that the vertical axis aberration of each wavelength is well corrected. In addition, the curves of each color are not obviously scattered, indicating that this zoom lens also has good correction of chromatic aberration, meeting the use requirements of this zoom lens.

[0122] Fig.23 is the axial aberration curve at the wide-angle end of the zoom lens proposed in Embodiment 3 of the present invention, Fig.24 This is the axial aberration curve of the telephoto end of the zoom lens proposed in the third embodiment of the present invention. The vertical direction represents the normalization of the aperture, 0 represents the optical axis, and the vertex in the vertical axis direction represents the maximum pupil radius; the main wavelength uses 546.074nm, and the horizontal direction represents the offset relative to the main wavelength, in millimeters (mm). Fig.23 , Fig.24 It can be seen that the axial aberrations of different wavelengths (blue represents 436nm, green represents 487nm, red represents 546nm, yellow represents 587nm, purple represents 656nm, and light blue represents 850nm) and the normalized aperture of 0.3 to 1.0 are all controlled within a reasonable range, indicating that the axial chromatic aberration of the zoom lens at different focal lengths is well controlled and meets the usage requirements.

[0123] Embodiment 4

[0124] Fig.25 is a schematic structural diagram of the wide-angle end of the zoom lens provided in Embodiment 4 of the present invention; Fig.26 : is a schematic diagram of the structure of the telephoto end of the zoom lens proposed in the fourth embodiment of the present invention. 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. The relevant parameters of the zoom lens can be referred to as shown in Table 1, Table 8 and Table 9.

[0125] Table 8 Design values ​​of 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 order of each lens, "STO" represents the aperture of the lens; IMA represents the image plane; the radius of curvature represents the curvature of the corresponding lens surface, a positive value represents that the surface is bent toward the image plane, and a negative value represents that the surface is bent toward the object plane, wherein "INF" represents that the surface is a plane and the radius of curvature is infinite; the thickness represents the central axial distance from the current surface to 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 space represents that the current position is air and the refractive index is 1.

[0129] Table 9 Parameters of the zoom lens at the wide-angle end and the telephoto end 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 size(mm) Φ13.10 Φ13.10 Focal length(mm) 15 50 Wavelength (nm) 436～850 436～850 Total optical length (mm) 125 125

[0131] Fig. 27 is a vertical axis chromatic aberration curve at the wide-angle end of the zoom lens proposed in Embodiment 4 of the present invention; Fig.28 This is the vertical axis chromatic aberration curve of the zoom lens at the telephoto end proposed in the fourth embodiment of the present invention. The vertical direction represents the normalization of the aperture, 0 represents the optical axis, and the vertex in the vertical axis represents the maximum image height. The main wavelength uses 546.07nm, and the horizontal direction represents the offset relative to the main wavelength, in micrometers (um). Fig. 27 , Fig.28 It can be seen that the vertical chromatic aberration of different wavelengths (the blue line represents 436nm, the green line represents 487nm, the red line represents 546nm, the yellow line represents 587nm, and the purple line represents 656nm) is controlled within a small range, indicating that the vertical chromatic aberration of the zoom lens at different focal lengths is well controlled and can meet the application requirements under normal conditions.

[0132] The ray fan diagram is one of the evaluation methods commonly used by optical designers. Fig.29 is a light fan diagram of the wide-angle end of the zoom lens provided in the fourth embodiment of the present invention; Fig.30 This is the light fan diagram of the telephoto end of the zoom lens proposed in Example 4 of the present invention. In a single diagram, the horizontal axis is the normalized light beam aperture, and the vertical axis is the vertical axis aberration. Ideally, each curve should completely coincide with the horizontal axis, at which time all light rays in the field of view are focused on the same point on the image plane; the vertical axis in a single image can also be expressed as the maximum dispersion range of the light beam on the ideal image plane. The light fan diagram can not only reflect the monochromatic aberrations of different wavelengths, but also indicate the size of the vertical axis chromatic aberration. By Fig.29 , Fig.30It can be seen that the wavelengths of this zoom lens at different focal lengths and fields of view (blue line represents 436nm, green line represents 487nm, red line represents 546nm, yellow line represents 587nm, and purple line represents 656nm) are all close to the horizontal axis, indicating that the vertical axis aberration of each wavelength is well corrected. In addition, the curves of each color are not obviously scattered, indicating that this zoom lens also has good correction of chromatic aberration, meeting the use requirements of this zoom lens.

[0133] Fig.31 The axial aberration curve at the wide-angle end of the zoom lens provided in the fourth embodiment of the present invention is: Fig.32 Axial aberration curve of the zoom lens at the telephoto end proposed in Example 4 of the present invention. The vertical direction represents the normalized aperture, 0 represents the optical axis, and the vertex in the vertical axis direction represents the maximum pupil radius; the main wavelength uses 546.074nm, and the horizontal direction represents the offset relative to the main wavelength, in millimeters (mm). Fig.31 , Fig.32 It can be seen that the axial aberrations of different wavelengths (blue represents 436nm, green represents 487nm, red represents 546nm, yellow represents 587nm, purple represents 656nm, and light blue represents 850nm) and the normalized aperture of 0.3 to 1.0 are all controlled within a reasonable range, indicating that the axial chromatic aberration of the zoom lens at different focal lengths is well controlled and meets the usage requirements.

[0134] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A zoom lens, characterized in that: include: Arranged in sequence from the object side to the image side along the optical axis are a first fixed lens group with positive focal power, a variable power lens group with negative focal power, an aperture, a second fixed lens group with positive focal power, a focusing lens group with positive focal power, and a flat glass; The relationship between the focal length F1 of the first fixed lens group, the focal length F2 of the variable power 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 zoom lens at the wide angle end 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, wherein: 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. The first lens and the second lens are glued together to form a first glued lens.

3. The zoom lens according to claim 2, wherein: 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; the object side surface of the third lens is convex, and the image side surface is concave.

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

5. The zoom lens according to claim 4, wherein: The object side surface of the fourth lens is concave, and the image side surface is concave; the object side surface of the fifth lens is concave, and the image side surface is concave; the object side surface of the sixth lens is convex, and the image side surface is concave.

6. The zoom lens according to claim 1, wherein: 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 lens, the ninth lens and the tenth lens are glued to form a third glued lens, and at least two of the eleventh lens, the twelfth lens and the thirteenth lens are glued to form a fourth glued lens.

7. The zoom lens according to claim 6, wherein: 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, and 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, wherein: The focal lengths F8-9-10 of the eighth lens, the ninth lens and the tenth lens and the focal length FG3 of the second fixed lens group satisfy: -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 and the focal length FG3 of the second fixed lens group satisfy: -2.195≤F11-12-13 / FG3≤2.

009.

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

10. The zoom lens according to claim 9, wherein: 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, wherein: The aperture of the zoom lens at the wide-angle end is WFNO≤1.86, and the aperture of the zoom lens at the telephoto end is TFNO≤1.

92.

12. The zoom lens according to claim 1, wherein: The refractive index nd7 and the 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 the 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, wherein: 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.

Images