Zoom lens

Abstract

The zoom lens comprises a focusing lens group with negative focal power, a diaphragm, a zoom lens group with positive focal power and a fixed lens group with positive or negative focal power which are sequentially arranged from an object space to an image space along an optical axis, the focusing lens group comprises a first lens with negative focal power, a second lens with negative focal power and a third lens with positive focal power; the zoom lens group comprises a fourth lens with positive focal power, a fifth lens with positive focal power, a sixth lens with negative focal power, a seventh lens with positive focal power, an eighth lens with negative focal power and a ninth lens with positive focal power; the fixed lens comprises a tenth lens with positive or negative focal power; and the focusing lens group and the zoom lens group are movably arranged along the direction of the optical axis, so that the zoom lens can be switched between a wide-angle end and a long-focus end. By adopting the technical scheme, the zoom lens has the advantages of large aperture, large target surface, high definition, small size and the like.

Description

Technical Field

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

[0002] In recent years, the surveillance market has seen increasingly diverse demands for lenses. In the security field, zoom lenses have been widely used due to their advantages of long shooting distance and wide shooting angles.

[0003] With the development of technology, cameras are gradually moving towards miniaturization and refinement, which also puts more stringent requirements on mainstream zoom lenses. Therefore, how to make zoom lenses have the advantages of large aperture, large image area, high definition, and small size has become a technical problem that needs to be solved urgently. Summary of the Invention

[0004] The present invention provides a zoom lens, so that the zoom lens has the advantages of large aperture, large target surface, high definition, small size, etc.

[0005] According to one aspect of the present invention, there is provided a zoom lens comprising: a focus lens group with negative optical power, an aperture stop, a variator lens group with positive optical power, and a fixed lens group with positive or negative optical power, arranged in sequence along an optical axis from the object side to the image side;

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

[0007] The zoom lens assembly includes a fourth lens with positive optical power, a fifth lens with positive optical power, a sixth lens with negative optical power, a seventh lens with positive optical power, an eighth lens with negative optical power, and a ninth lens with positive optical power;

[0008] The fixed lens group is composed of a tenth lens with positive or negative optical power;

[0009] The focus lens group and the zoom lens group are arranged to move along the direction of the optical axis; when the focus lens group and the zoom lens group move in coordination along the direction of the optical axis, the zoom lens is switched between the wide-angle end and the telephoto end.

[0010] Optionally, in the focusing lens group,

[0011] The object-side surface of the first lens is convex, and the image-side surface of the first lens is concave;

[0012] The object-side surface of the second lens is convex, and the image-side surface of the second lens is concave;

[0013] The object-side surface of the third lens is convex, and the image-side surface of the third lens is concave;

[0014] In the variable magnification lens group,

[0015] The object-side surface of the fourth lens is convex, and the image-side surface of the fourth lens is convex;

[0016] The object-side surface of the fifth lens is convex, and the image-side surface of the fifth lens is convex;

[0017] The object-side surface of the sixth lens is concave, and the image-side surface of the sixth lens is concave;

[0018] The object-side surface of the seventh lens is convex, and the image-side surface of the seventh lens is concave;

[0019] The object-side surface of the eighth lens is concave, and the image-side surface of the eighth lens is convex;

[0020] The object-side surface of the ninth lens is convex, and the image-side surface of the ninth lens is concave;

[0021] In the fixed lens group,

[0022] The object-side surface of the tenth lens is concave, and the image-side surface of the tenth lens is convex.

[0023] Optionally, the second lens, the third lens, the eighth lens, the ninth lens and the tenth lens are all plastic aspheric lenses;

[0024] The fourth lens is a glass aspherical lens.

[0025] Optionally, the aperture number of the zoom lens at the wide-angle end is FNO1 ≥ 1.505;

[0026] The aperture number of the zoom lens at the telephoto end is FNO2≤2.513.

[0027] Optional, -2.74≤FG1 / FW≤-2.67;

[0028] 2.38≤FG2 / FW≤2.45;

[0029] -140.14≤FG3 / FW≤393.20;

[0030] Among them, FG1 is the focal length of the focusing lens group, FG2 is the focal length of the zoom lens group, FG3 is the focal length of the fixed lens group, and FW is the focal length of the zoom lens at the wide-angle end.

[0031] Optional, -0.85≤FG1 / FT≤-0.84;

[0032] 0.74≤FG2 / FT≤0.77;

[0033] -43.89≤FG3 / FT≤123.16;

[0034] Among them, FG1 is the focal length of the focusing lens group, FG2 is the focal length of the zoom lens group, FG3 is the focal length of the fixed lens group, and FT is the focal length of the zoom lens at the telephoto end.

[0035] Optional, 0.73≤S2 / S1≤0.78

[0036] Among them, S1 is the maximum distance that the focusing lens group can move, and S2 is the maximum distance that the zoom lens group can move.

[0037] Optionally, the fifth lens, the sixth lens and the seventh lens form a cemented lens group;

[0038] Among them, -41.69≤F567 / FG2≤9.36;

[0039] F567 represents the combined focal length of the fifth lens, the sixth lens, and the seventh lens, and FG2 represents the focal length of the zoom lens group.

[0040] Optional, 1.438≤nd4≤1.504;81.244≤vd4≤81.853;

[0041] 1.520≤nd5≤1.60;68.937≤vd5≤77.316;

[0042] 1.443≤nd7≤1.499;90.023≤vd7≤95.413;

[0043] Among them, nd4 is the refractive index of the fourth lens, vd4 is the Abbe number of the fourth lens; nd5 is the refractive index of the fifth lens, vd5 is the Abbe number of the fifth lens; nd7 is the refractive index of the seventh lens, vd7 is the Abbe number of the seventh lens.

[0044] Optional, 3.19≤FT / FW≤3.24;

[0045] Wherein, FW represents the focal length of the zoom lens at the wide-angle end, and FT represents the focal length of the zoom lens at the telephoto end.

[0046] Optional, 5.97≤TTL / S2≤6.20;

[0047] Wherein, TTL represents the total length of the optical system of the zoom lens at the wide-angle end, and S2 represents the maximum distance that the zoom lens group can move.

[0048] The technical solution of the present invention provides a zoom lens with a powerful image acquisition function. While meeting the requirements of high resolution and a large target surface, it can ensure large aperture zoom within the full focal length range, and can still capture high-definition images even when external fill light is insufficient. It can have a longer focal length, a larger aperture, and a larger magnification, and at the same time have smaller optical distortion at both the wide-angle end and the telephoto end, meeting high-quality imaging requirements, making the zoom lens suitable for more application scenarios. At the same time, the zoom lens uses ten lenses, which gives the zoom lens the advantages of a large aperture, a large target surface, high definition, and a small size.

[0049] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] 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.

[0051] Figure 1 1 is a schematic structural diagram of a zoom lens at a wide-angle end provided by an embodiment of the present invention;

[0052] Figure 2 1 is a schematic structural diagram of a zoom lens provided by an embodiment of the present invention at a telephoto end;

[0053] Figure 3 yes Figure 1 The vertical axial chromatic aberration diagram of the zoom lens at the wide-angle end is shown;

[0054] Figure 4 yes Figure 1 Axial aberration diagram of the zoom lens at the wide-angle end shown;

[0055] Figure 5 yes Figure 1 The ray fan diagram shown is when the image plane is 0.0000mm at the wide-angle end of the zoom lens;

[0056] Figure 6 yes Figure 1 The ray fan diagram shown is when the image plane is 1.3800mm at the wide-angle end of the zoom lens;

[0057] Figure 7 yes Figure 1 The ray fan diagram shown is when the image plane is 2.3000mm at the wide-angle end of the zoom lens;

[0058] Figure 8 yes Figure 1 The ray fan diagram shown is when the image plane is 2.7600mm at the wide-angle end of the zoom lens;

[0059] Figure 9 yes Figure 1 The ray fan diagram shown is when the image plane is 3.2200mm at the wide-angle end of the zoom lens;

[0060] Figure 10 yes Figure 1 The ray fan diagram shown is when the image plane is 3.6800mm at the wide-angle end of the zoom lens;

[0061] Figure 11 yes Figure 1 The ray fan diagram shown is when the image plane is 4.1400mm at the wide-angle end of the zoom lens;

[0062] Figure 12 yes Figure 1 The ray fan diagram shown is when the image plane is 4.6000mm at the wide-angle end of the zoom lens;

[0063] Figure 13 yes Figure 2 The vertical axis chromatic aberration diagram of the zoom lens at the telephoto end is shown;

[0064] Figure 14 yes Figure 2 Axial aberration diagram of the zoom lens at the telephoto end shown;

[0065] Figure 15 yes Figure 2 The ray fan diagram shown is when the image plane is 0.0000mm at the telephoto end of the zoom lens;

[0066] Figure 16 yes Figure 2 The ray fan diagram shown is when the image plane is 1.3800mm at the telephoto end of the zoom lens;

[0067] Figure 17 yes Figure 2 The ray fan diagram shown is when the image plane is 2.3000mm at the telephoto end of the zoom lens;

[0068] Figure 18 yes Figure 2 The ray fan diagram shown is when the image plane is 2.7600mm at the telephoto end of the zoom lens;

[0069] Figure 19 yes Figure 2 The ray fan diagram shown is when the image plane is 3.2200mm at the telephoto end of the zoom lens;

[0070] Figure 20 yes Figure 2The ray fan diagram shown is when the image plane is 3.6800mm at the telephoto end of the zoom lens;

[0071] Figure 21 yes Figure 2 The ray fan diagram shown is when the image plane is 4.1400mm at the telephoto end of the zoom lens;

[0072] Figure 22 yes Figure 2 The ray fan diagram shown is when the image plane is 4.6000mm at the telephoto end of the zoom lens;

[0073] Figure 23 1 is a schematic structural diagram of another zoom lens provided by an embodiment of the present invention at the wide-angle end;

[0074] Figure 24 1 is a schematic structural diagram of another zoom lens provided by an embodiment of the present invention at the telephoto end;

[0075] Figure 25 yes Figure 23 The vertical axial chromatic aberration diagram of the zoom lens at the wide-angle end is shown;

[0076] Figure 26 yes Figure 23 Axial aberration diagram of the zoom lens at the wide-angle end shown;

[0077] Figure 27 yes Figure 23 The ray fan diagram shown is when the image plane is 0.0000mm at the wide-angle end of the zoom lens;

[0078] Figure 28 yes Figure 23 The ray fan diagram shown is when the image plane is 1.3800mm at the wide-angle end of the zoom lens;

[0079] Figure 29 yes Figure 23 The ray fan diagram shown is when the image plane is 2.3000mm at the wide-angle end of the zoom lens;

[0080] Figure 30 yes Figure 23 The ray fan diagram shown is when the image plane is 2.7600mm at the wide-angle end of the zoom lens;

[0081] Figure 31 yes Figure 23 The ray fan diagram shown is when the image plane is 3.2200mm at the wide-angle end of the zoom lens;

[0082] Figure 32 yes Figure 23 The ray fan diagram shown is when the image plane is 3.6800mm at the wide-angle end of the zoom lens;

[0083] Figure 33 yes Figure 23 The ray fan diagram shown is when the image plane is 4.1400mm at the wide-angle end of the zoom lens;

[0084] Figure 34 yes Figure 23 The ray fan diagram shown is when the image plane is 4.6000mm at the wide-angle end of the zoom lens;

[0085] Figure 35 yes Figure 24 The vertical axis chromatic aberration diagram of the zoom lens at the telephoto end is shown;

[0086] Figure 36 yes Figure 24 Axial aberration diagram of the zoom lens at the telephoto end shown;

[0087] Figure 37 yes Figure 24 The ray fan diagram shown is when the image plane is 0.0000mm at the telephoto end of the zoom lens;

[0088] Figure 38 yes Figure 24 The ray fan diagram shown is when the image plane is 1.3800mm at the telephoto end of the zoom lens;

[0089] Figure 39 yes Figure 24 The ray fan diagram shown is when the image plane is 2.3000mm at the telephoto end of the zoom lens;

[0090] Figure 40 yes Figure 24 The ray fan diagram shown is when the image plane is 2.7600mm at the telephoto end of the zoom lens;

[0091] Figure 41 yes Figure 24 The ray fan diagram shown is when the image plane is 3.2200mm at the telephoto end of the zoom lens;

[0092] Figure 42 yes Figure 24 The ray fan diagram shown is when the image plane is 3.6800mm at the telephoto end of the zoom lens;

[0093] Figure 43 yes Figure 24 The ray fan diagram shown is when the image plane is 4.1400mm at the telephoto end of the zoom lens;

[0094] Figure 44 yes Figure 24 The ray fan diagram shown is when the image plane is 4.6000mm at the telephoto end of the zoom lens;

[0095] Figure 45 1 is a schematic structural diagram of another zoom lens provided by an embodiment of the present invention at the wide-angle end;

[0096] Figure 46 1 is a schematic structural diagram of another zoom lens provided by an embodiment of the present invention at the telephoto end;

[0097] Figure 47 yes Figure 45 The vertical axial chromatic aberration diagram of the zoom lens at the wide-angle end is shown;

[0098] Figure 48 yes Figure 45 Axial aberration diagram of the zoom lens at the wide-angle end shown;

[0099] Figure 49 yes Figure 45 The ray fan diagram shown is when the image plane is 0.0000mm at the wide-angle end of the zoom lens;

[0100] Figure 50 yes Figure 45 The ray fan diagram shown is when the image plane is 1.3800mm at the wide-angle end of the zoom lens;

[0101] Figure 51 yes Figure 45 The ray fan diagram shown is when the image plane is 2.3000mm at the wide-angle end of the zoom lens;

[0102] Figure 52 yes Figure 45 The ray fan diagram shown is when the image plane is 2.7600mm at the wide-angle end of the zoom lens;

[0103] Figure 53 yes Figure 45 The ray fan diagram shown is when the image plane is 3.2200mm at the wide-angle end of the zoom lens;

[0104] Figure 54 yes Figure 45 The ray fan diagram shown is when the image plane is 3.6800mm at the wide-angle end of the zoom lens;

[0105] Figure 55 yes Figure 45 The ray fan diagram shown is when the image plane is 4.1400mm at the wide-angle end of the zoom lens;

[0106] Figure 56 yes Figure 45 The ray fan diagram shown is when the image plane is 4.6000mm at the wide-angle end of the zoom lens;

[0107] Figure 57 yes Figure 46 The vertical axis chromatic aberration diagram of the zoom lens at the telephoto end is shown;

[0108] Figure 58 yes Figure 46 Axial aberration diagram of the zoom lens at the telephoto end shown;

[0109] Figure 59 yes Figure 46 The ray fan diagram shown is when the image plane is 0.0000mm at the telephoto end of the zoom lens;

[0110] Figure 60 yes Figure 46 The ray fan diagram shown is when the image plane is 1.3800mm at the telephoto end of the zoom lens;

[0111] Figure 61 yes Figure 46 The ray fan diagram shown is when the image plane is 2.3000mm at the telephoto end of the zoom lens;

[0112] Figure 62 yes Figure 46 The ray fan diagram shown is when the image plane is 2.7600mm at the telephoto end of the zoom lens;

[0113] Figure 63 yes Figure 46 The ray fan diagram shown is when the image plane is 3.2200mm at the telephoto end of the zoom lens;

[0114] Figure 64 yes Figure 46 The ray fan diagram shown is when the image plane is 3.6800mm at the telephoto end of the zoom lens;

[0115] Figure 65 yes Figure 46 The ray fan diagram shown is when the image plane is 4.1400mm at the telephoto end of the zoom lens;

[0116] Figure 66 yes Figure 46 The ray fan diagram shown is when the image plane is 4.6000mm at the telephoto end of the zoom lens. DETAILED DESCRIPTION

[0117] To further clarify the objectives, technical solutions, and advantages of the present invention, the following fully describes the technical solutions of the present invention through specific embodiments, in conjunction with the accompanying drawings of the embodiments of the present invention. It should be understood that the described embodiments are only a portion of the embodiments of the present invention, not all of them. It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the present invention. Therefore, the present invention is intended to cover modifications and variations of the present invention that fall within the scope of the corresponding claims (technical solutions claimed for protection) and their equivalents.

[0118] Furthermore, the words “first”, “second” and similar terms used in the embodiments of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as “one”, “an” or “the” do not indicate a quantity limitation, but rather indicate the existence of at least one. Words such as “include” or “comprise” mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as “connect” or “connected” are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. “Up”, “down”, “left”, “right” and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. In addition, descriptions such as “same” and “equal” involved in the embodiments of the present disclosure do not mean that the two objects are exactly the same in size or shape. Approximately the same or approximately equal within a certain error range is allowed.

[0119] It should be noted that the implementation methods provided in the embodiments of the present invention can be combined with each other if there is no contradiction.

[0120] Figure 1 1 is a schematic structural diagram of a zoom lens at a wide-angle end provided by an embodiment of the present invention. Figure 2 is a structural diagram of a zoom lens provided by an embodiment of the present invention at the telephoto end, with reference to Figure 1 and Figure 2 The zoom lens includes a focus lens group G1 with negative focal power, an aperture STO, a variator lens group G2 with positive focal power, and a fixed lens group G3 with positive or negative focal power, which are arranged in sequence from the object side to the image side along the optical axis; the focus lens group G1 includes a first lens L1 with negative focal power, a second lens L2 with negative focal power, and a third lens L3 with positive focal power; the variator lens group G2 includes a fourth lens L4 with positive focal power, a fifth lens L5 with positive focal power. , a sixth lens L6 with negative optical focal power, a seventh lens L7 with positive optical focal power, an eighth lens L8 with negative optical focal power, and a ninth lens L9 with positive optical focal power; the fixed lens group G3 is composed of a tenth lens L10 with positive or negative optical focal power; wherein, the focusing lens group G1 and the magnification lens group G2 are arranged to move along the direction of the optical axis; when the focusing lens group G1 and the magnification lens group G2 move in coordination along the direction of the optical axis, the zoom lens is switched between the wide-angle end and the telephoto end.

[0121] The focusing lens group G1, the aperture STO, the zoom lens group G2 and the fixed lens group G3 can be arranged in one lens barrel ( Figure 1 and Figure 2(not shown in the figure), the position of the fixed lens group G3 in the lens barrel is fixed. At this time, the fixed lens group G3 remains stationary relative to the image plane, and the focusing lens group G1 and the magnification lens group G2 can move back and forth in the lens barrel along the optical axis. Through the coordinated movement of the focusing lens group G1 and the magnification lens group G2, the focal length of the zoom lens can be continuously changed from wide angle to telephoto, ensuring high image quality at all focus positions. The aperture STO of the zoom lens is located between the third lens L3 with positive focal power and the fourth lens L4 with positive focal power. By changing the position of the focusing lens group G1 and the magnification lens group G2 on the optical axis in the optical lens, the zoom lens can be switched between the wide-angle end and the telephoto end at any time.

[0122] It can be understood that in the process of achieving zoom by moving the focusing lens group G1 and the magnification lens group G2, when the focal length is shortest, the zoom lens is located at the wide-angle end, and when the focal length is longest, the zoom lens is located at the telephoto end. At the wide-angle end and the telephoto end, the zoom lens has different focal lengths and optical focal powers, and also has different lengths or shapes.

[0123] In this embodiment of the present invention, the negative-power focusing lens group G1, positioned before the aperture STO of the zoom lens, ensures a larger light aperture after light passes through it, increasing the optical system's F-number and ensuring clear images of both near and far objects, even in dark environments, meeting the requirements of various usage conditions. The focusing lens group G1, in conjunction with the fourth lens L4 in the zoom lens group G2, ensures smooth passage of light through the aperture STO, preventing stray light such as reflections at the aperture STO. This lens also adjusts the zoom lens's aberrations to a certain extent, ensuring aberration balance and stable high- and low-temperature performance. The fifth, sixth, and seventh lenses L5, L6, and L7 in the zoom lens group G2 correct aberrations at the rear end of the zoom lens. Working in conjunction with the focusing lens group G1 in front of the aperture STO, they stabilize the optical system's imaging quality. The zoom lens group G2, in conjunction with the tenth lens L10 in the fixed lens group G3, minimizes higher-order aberrations, expanding the lens's target area (size) while improving image quality and meeting the requirements of a wider range of usage scenarios.

[0124] It should be noted that focal power is equal to the difference between the image-side and object-side beam convergence. Its value is the reciprocal of the focal length and represents the optical system's ability to deflect light. The larger the absolute value of the focal power, the stronger the light-bending ability; the smaller the absolute value, the weaker the light-bending ability. When the focal power is a positive number, the light is refracted in a convergent manner; when the focal power is a negative number, the light is refracted in a divergent manner. Focal power can be applied to characterize a refractive surface of a lens (i.e., a surface of a lens), a single lens, or a system formed by multiple lenses (i.e., a lens assembly).

[0125] In the embodiment of the present invention, the focusing lens group G1 is provided with a first lens L1 having a negative optical power, a second lens L2 having a negative optical power, and a third lens L3 having a positive optical power, so that the focusing lens group G1 has a negative optical power. The zoom lens group G2 is provided with a fourth lens L4 having a positive optical power, a fifth lens L5 having a positive optical power, a sixth lens L6 having a negative optical power, a seventh lens L7 having a positive optical power, an eighth lens L8 having a negative optical power, and a ninth lens L9 having a positive optical power. L9 makes the zoom lens group G2 have a positive optical focal length, and the tenth lens L10 with a positive or negative optical focal length is set in the fixed lens group G3, so that the fixed lens group G3 has a positive or negative optical focal length. This allows the optical focal lengths of the various lens groups to cooperate with each other, ensuring that the zoom lens can have a larger aperture and a longer focal length. At the same time, after the light enters through the focusing lens group G1, it can smoothly pass through the various lens groups, which is beneficial to reducing the aberration and chromatic aberration of the zoom lens, and ensuring that the zoom lens has a higher imaging quality.

[0126] In addition, an aperture STO is positioned between the focusing lens group G1 and the zoom lens group G2. This aperture STO adjusts the direction of light beam propagation, thereby improving image quality. By placing the aperture STO between the focusing lens group G1 and the zoom lens group G2, the higher-order aberrations of the zoom lens can be controlled at the front end, ensuring a higher image height at the rear end. This expands the imaging target area while improving image quality, making the zoom lens suitable for a variety of application scenarios.

[0127] Exemplarily, a plane glass lens CG is further provided along the direction from the object plane to the image plane; the plane glass lens CG is located on the image-side surface of the tenth lens L10. The plane glass lens CG can protect the photosensitive chip in the imaging sensor, wherein the photosensitive chip is used to convert the light signal collected by the zoom lens into an electrical signal, thereby ensuring the imaging effect of the zoom lens.

[0128] In summary, the zoom lens provided by the embodiment of the present invention has a powerful image acquisition function. While meeting the requirements of high resolution and a large target surface, it can ensure large aperture zoom within the full focal length range, and can still capture high-definition image quality even when external fill light is insufficient. It can have a long focal length, a large aperture, and a large magnification. At the same time, it can have small optical distortion at both the wide-angle end and the telephoto end, meeting the high-quality imaging requirements, making the zoom lens suitable for more application scenarios. At the same time, the zoom lens provided by the embodiment of the present invention uses ten lenses, which makes the zoom lens have the advantages of large aperture, large target surface, high definition, and small size.

[0129] Optionally, in the focusing lens group G1, the object-side surface of the first lens L1 is convex, and the image-side surface of the first lens L1 is concave; the object-side surface of the second lens L2 is convex, and the image-side surface of the second lens L2 is concave; the object-side surface of the third lens L3 is convex, and the image-side surface of the third lens L3 is concave; in the zoom lens group G2, the object-side surface of the fourth lens L4 is convex, and the image-side surface of the fourth lens L4 is convex; the object-side surface of the fifth lens L5 is convex, and the image-side surface of the fifth lens L5 is concave. The image-side surface is convex; the object-side surface of the sixth lens L6 is concave, and the image-side surface of the sixth lens L6 is concave; the object-side surface of the seventh lens L7 is convex, and the image-side surface of the seventh lens L7 is concave; the object-side surface of the eighth lens L8 is concave, and the image-side surface of the eighth lens L8 is convex; the object-side surface of the ninth lens L9 is convex, and the image-side surface of the ninth lens L9 is concave; in the fixed lens group G3, the object-side surface of the tenth lens L10 is concave, and the image-side surface of the tenth lens L10 is convex. This arrangement ensures that light from the object side, after entering the zoom lens, can smoothly pass through each lens in the zoom lens, thereby effectively reducing optical distortion and improving image quality.

[0130] Optionally, the second lens L2 and the third lens L3 in the focusing lens group G1, the eighth lens L8 and the ninth lens L9 in the variator lens group G2, and the tenth lens L10 in the fixed lens group G3 are all plastic aspheric lenses; the fourth lens L4 in the variator lens group G2 is a glass aspheric lens.

[0131] In this way, the aspherical lenses used in focusing lens group G1 and variator lens group G2 correct high-order chromatic aberrations and aberrations, controlling the aberration balance of each group, ensuring that light entering the structure after the aperture does not produce serious aberrations, thereby improving the imaging quality of the optical system. Furthermore, variator lens group G2, in conjunction with the aspherical tenth lens L10 in fixed lens group G3, minimizes high-order aberrations, expanding the lens target area (size) while improving image quality and meeting the requirements of a wider range of usage scenarios.

[0132] Aspheric lenses are excellent at controlling higher-order aberrations in optical systems. Using an aspheric lens for the fourth lens element, L4, can further reduce higher-order aberrations after light passes through the aperture, improving the imaging quality of the optical system. Furthermore, the properties of glass lenses are insensitive to temperature. Using a glass aspheric lens for the fourth lens element, L4, can make the zoom lens's performance more uniform across different temperature conditions, resulting in stable high and low-temperature performance. The introduction of glass aspheric lenses also significantly corrects the lens's chromatic aberrations and higher-order aberrations. Compared to plastic aspheric lenses, the range of available options is wider, allowing for a wider variety of structural options, improving the lens's market competitiveness. The glass spherical lens can be made of various types of glass known to those skilled in the art, and this will not be discussed in detail in the present invention.

[0133] In an optional embodiment, the first lens L1, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are all glass spherical lenses. The use of a relatively low proportion of glass lenses in the zoom lens can make the zoom lens smaller, which is conducive to reducing the cost of the zoom lens.

[0134] The zoom lens can optionally have an aperture of FNO1 ≥ 1.505 at the wide-angle end and an aperture of FNO2 ≤ 2.513 at the telephoto end. This ensures both wide-range low-light adaptability and the ability to capture details at long distances, enabling 24-hour monitoring of complex scenes from broad perspectives to distant details.

[0135] Optionally, -2.74≤FG1 / FW≤-2.67; 2.38≤FG2 / FW≤2.45; -140.14≤FG3 / FW ≤393.20; wherein, FG1 is the focal length of the focusing lens group G1, FG2 is the focal length of the zoom lens group G2, FG3 is the focal length of the fixed lens group G3, and FW is the focal length of the zoom lens at the wide-angle end.

[0136] Optionally, -0.85≤FG1 / FT≤-0.84; 0.74≤FG2 / FT≤0.77; -43.89≤FG3 / FT≤123.16; wherein, FG1 is the focal length of the focusing lens group G1, FG2 is the focal length of the zoom lens group G2, FG3 is the focal length of the fixed lens group G3, and FT is the focal length of the zoom lens at the telephoto end.

[0137] In this way, a reasonable combination of optical power can be achieved, allowing light to pass through the zoom lens more smoothly, and to a large extent correcting the impact of high-level aberrations on image quality.

[0138] Optionally, 0.73 ≤ S2 / S1 ≤ 0.78, where S1 is the maximum movable distance of the focus lens group G1, and S2 is the maximum movable distance of the zoom lens group G2. By controlling the moving distances of the focus lens group G1 and the zoom lens group G2, the size and range of motion of the focus lens group G1 can be minimized, thereby significantly reducing the size of the zoom lens.

[0139] Optionally, the fifth lens L5, the sixth lens L6 and the seventh lens L7 form a cemented lens group; wherein, -41.69≤F567 / FG2≤9.36; F567 represents the combined focal length of the fifth lens L5, the sixth lens L6 and the seventh lens L7, and FG2 represents the focal length of the variator lens group G2.

[0140] Specifically, the use of a triplet lens after the aperture STO can reduce chromatic aberration by complementing the chromatic aberration of the positive and negative power surfaces of the cemented lenses. At the same time, the residual chromatic aberration is used to balance the chromatic aberration caused by other components of the zoom lens. This allows the various aberrations of the zoom lens to be fully corrected, improving imaging performance. While maintaining a compact structure, it can increase resolution, optimize optical properties such as distortion, reduce light loss caused by reflections between lenses, and increase illumination, thereby improving image quality and enhancing the clarity of the lens image. In addition, by setting up a triplet of the fifth lens L5, the sixth lens L6, and the seventh lens L7, the air space between the fifth lens L5, the sixth lens L6, and the seventh lens L7 can be effectively reduced, thereby further reducing the overall length of the lens.

[0141] Optionally, 1.438≤nd4≤1.504; 81.244≤vd4≤81.853; 1.520≤nd5≤1.60; 68.937≤vd5≤77.316; 1.443≤nd7≤1.499; 90.023≤vd7≤95.413; wherein, nd4 is the refractive index of the fourth lens L4, and vd4 is the Abbe number of the fourth lens L4; nd5 is the refractive index of the fifth lens L5, and vd5 is the Abbe number of the fifth lens L5; nd7 is the refractive index of the seventh lens L7, and vd7 is the Abbe number of the seventh lens L7.

[0142] For example, taking the triplet lens group consisting of the fifth lens L5, the sixth lens L6, and the seventh lens L7 as an example, the correction of chromatic aberration and higher-order aberrations in this zoom optical system primarily relies on the triplet lens group and the aspheric lens. Therefore, the material selection of the fourth lens L4 located after the aperture stop STO, as well as the front and rear lenses of the triplet lens group, the fifth lens L5 and the seventh lens L7, is crucial. The introduction of the aspheric lens of the fourth lens L4 after the aperture stop STO can effectively improve the chromatic aberration of the light passing through the aperture. At the same time, the high Abbe number of the fourth lens L4 also effectively corrects the chromatic aberration of the light after the aperture stop STO. The use of high Abbe number materials for the triplet lens group and the front and rear lenses, the fifth lens L5 and the seventh lens L7, can correct the chromatic aberration and higher-order aberrations generated at the rear end of the lens. After the light passes through the aperture STO, the use of a triplet lens group can effectively correct chromatic aberration, preventing the superposition of chromatic aberration at the rear end of the lens, which would require a large amount of high-Abbe number material to pull it back. It can also effectively reduce chromatic aberration to achieve confocal imaging of the visible light band and the near-infrared band, and to achieve clear imaging.

[0143] Optionally, 3.19 ≤ FT / FW ≤ 3.24; FW represents the focal length of the zoom lens at the wide-angle end, and FT represents the focal length of the zoom lens at the telephoto end. By controlling the focal length ratio of the zoom lens at the wide-angle end to the telephoto end, the zoom range and focal length range of the zoom lens can be controlled to meet the needs of various conditions.

[0144] Optionally, 5.97 ≤ TTL / S2 ≤ 6.20; TTL represents the total optical length of the zoom lens at the wide-angle end, and S2 represents the maximum distance the zoom lens group can move. The total length at the wide-angle end is longest during the entire zooming process of the zoom lens. This limitation of the zoom lens group G2 and the total lens length can compress the lens space, ensuring that the required image quality and zoom range are met while maintaining a small lens volume.

[0145] By assigning parameters such as the lens surface type, curvature radius, thickness, and material of each lens in the zoom lens, the embodiment of the present invention can ultimately realize a zoom lens with a large aperture, a large target surface, and clear imaging within a 1 / 1.8" target surface and a wavelength range of 436nm-850nm.

[0146] In an exemplary embodiment, Table 1 details a possible implementation method. Figure 1 and Figure 2 Specific parameters of the zoom lens shown.

[0147] Table 1 Parameter design of a zoom lens

[0148]

[0149] Table 2 shows the design parameters of a zoom lens corresponding to Table 1, including lens surface type, curvature radius, thickness, and material.

[0150] Table 2 Optical physical parameter design of a zoom lens

[0151]

[0152] like Figure 1 and Figure 2 As shown, the zoom lens provided in this embodiment consists of 10 lenses and a flat glass lens CG, that is, the zoom lens includes a focus lens group G1 with negative optical power, an aperture STO, a variator lens group G2 with positive optical power, a fixed lens group G3 with positive or negative optical power, and a flat glass lens CG, which are arranged in sequence along the optical axis from the object side to the image side; the focus lens group G1 includes a first lens L1 with negative optical power, a second lens L2 with negative optical power, and a third lens L3 with positive optical power; the variator lens group G2 includes a first lens L1 with negative optical power, a second lens L2 with negative optical power, and a third lens L3 with positive optical power; The fixed lens group G3 consists of a tenth lens L10 with positive or negative optical power; the focusing lens group G1 and the zoom lens group G2 are arranged to move along the direction of the optical axis; when the focusing lens group G1 and the zoom lens group G2 move in coordination along the direction of the optical axis, the zoom lens is switched between the wide-angle end and the telephoto end.

[0153] The surface numbers in Table 2 are numbered according to the order of the surfaces of each lens. For example, surface number 1 represents the object-side surface of the first lens L1, surface number 2 represents the image-side surface of the first lens L1, and so on. "STO" represents the aperture stop of the zoom lens. The radius of curvature represents the degree of curvature of the corresponding lens surface, measured in mm. A positive value indicates that the surface is curved toward the image side, while a negative value indicates that the surface is curved toward the object side. "INF" indicates that the surface is flat and the radius of curvature is infinite. The thickness represents the axial distance from the center of the current surface to the next surface, measured in mm. The refractive index represents the ability of the material between the current surface and the next surface to deflect light. A blank space represents that the current position is air, with a refractive index of 1. The Abbe number represents the ability of the material between the current surface and the next surface to disperse light. A blank space represents that the current position is air, with an Abbe number of 1.

[0154] Table 3 shows the design parameters of the zoom interval at the wide-angle end and the telephoto end of a zoom lens corresponding to Table 2.

[0155] Table 3 A zoom interval design for the wide-angle and telephoto ends of a zoom lens

[0156]

[0157] Table 4 shows the aspheric coefficient values ​​used in the current embodiment.

[0158] Table 4 Aspheric coefficients of a zoom lens

[0159]

[0160] Among them, -7.262515000414E-04 means that the coefficient A of face number 3 is -7.262515000414×10 -4 , and so on.

[0161] The k value in Table 4 represents the numerical value of the best-fit cone coefficient of the aspheric surface. The aspheric cone coefficient can be defined by the following aspheric formula, but is not limited to the following expression method:

[0162]

[0163] Among them, z is the axial sagittal height of the aspheric surface in the Z direction; r is the height of the aspheric surface; c is the curvature of the fitted sphere, which is the reciprocal of the curvature radius; k is the fitting cone coefficient; A, B, C, D, E, F, and G are the 4th, 6th, 8th, 10th, 12th, 14th, and 16th orders of the aspheric polynomial, respectively.

[0164] Based on the above parameter design, Table 5 shows the lens parameters of the zoom lens implemented in this embodiment.

[0165] Table 5 Lens parameters of a zoom lens

[0166]

[0167] Figure 3 yes Figure 1 The vertical axis chromatic aberration diagram of the zoom lens at the wide angle end is shown. Figure 3 The vertical axis chromatic aberration curves for wavelengths of 436nm, 486nm, 546nm, 587nm, 656nm, and 850nm are shown. The vertical direction represents the field of view, 0 represents the optical axis, and the vertical axis vertex represents the maximum field of view (4.6000mm). The dominant wavelength is 546nm, and the horizontal direction represents the offset relative to the dominant wavelength in micrometers (μm). Figure 3 It can be seen that the vertical chromatic aberration of different wavelengths is controlled within a small range, indicating that the vertical chromatic aberration of this zoom lens at the wide-angle end is well controlled and can meet the application requirements under normal conditions.

[0168] Figure 4 yes Figure 1 The axial aberration diagram of the zoom lens at the wide-angle end is shown below. Figure 4 The axial aberration curves for wavelengths of 436nm, 486nm, 546nm, 587nm, 656nm, and 850nm are shown. The vertical direction represents the normalized aperture, 0 represents the optical axis, and the vertex in the vertical axis represents the maximum pupil radius, which is 1.4712 mm. The dominant wavelength is 546nm, and the horizontal direction represents the offset relative to the dominant wavelength, in millimeters (mm). Figure 4 It can be seen that axial aberrations at various wavelengths, ranging from 0.3 to 1.0 normalized apertures, are all within reasonable ranges, demonstrating that vertical chromatic aberration at the wide-angle end of this zoom lens is well controlled and meets operational requirements. Furthermore, at pupil positions of 0.5 to 0.9, there is no noticeable chromatic aberration between visible and infrared light, meeting the basic requirements for clear nighttime imaging and achieving sharp images across the entire wavelength range.

[0169] Figures 5 to 12 yes Figure 1 The ray fan diagram at the wide-angle end of the zoom lens is shown in Figures 5 to 12 As shown, the horizontal axis is the normalized beam diameter, and the vertical axis is the vertical axis aberration. The ray fan diagram is one of the most commonly used evaluation methods in modern optical design. The most ideal curves are completely coincident with the horizontal axis. At this time, all light rays in the field of view are focused on the same point on the image plane. The corresponding interval on the vertical axis of the curve is the maximum dispersion range of the light beam on the ideal image plane. The ray fan diagram can not only reflect the monochromatic aberration of different wavelengths, but also indicate the size of the vertical axis chromatic aberration. Figures 5 to 12It can be seen that the zoom lens at each wavelength in each field of view at the wide-angle end is well aligned with the horizontal axis, indicating that the vertical axis aberration of each wavelength of the zoom lens is well corrected. At the same time, there is no obvious dispersion in the curves of each wavelength, indicating that the zoom lens is also well corrected for chromatic aberration, which can achieve high-resolution imaging requirements and meet the use needs of the zoom lens. Figure 5 yes Figure 1 The ray fan diagram shown is when the image plane is 0.0000mm at the wide-angle end of the zoom lens. Figure 6 yes Figure 1 The ray fan diagram of the zoom lens at the wide-angle end when the image plane is 1.3800mm is shown. Figure 7 yes Figure 1 The ray fan diagram of the zoom lens at the wide-angle end when the image plane is 2.3000mm is shown. Figure 8 yes Figure 1 The ray fan diagram of the zoom lens at the wide-angle end when the image plane is 2.7600mm is shown. Figure 9 yes Figure 1 The ray fan diagram of the zoom lens at the wide-angle end when the image plane is 3.2200mm is shown. Figure 10 yes Figure 1 The ray fan diagram of the zoom lens at the wide-angle end when the image plane is 3.6800mm is shown. Figure 11 yes Figure 1 The ray fan diagram of the zoom lens at the wide-angle end when the image plane is 4.1400mm is shown. Figure 12 yes Figure 1 The ray fan diagram shown is when the image plane is 4.6000mm at the wide-angle end of the zoom lens. Figures 5 to 12 Curves for light with a wavelength of 436 nm, light with a wavelength of 486 nm, light with a wavelength of 546 nm, light with a wavelength of 587 nm, light with a wavelength of 656 nm, and light with a wavelength of 859 nm are shown, with a maximum scaling of ±100.000 μm.

[0170] Figure 13 yes Figure 2 The vertical axis chromatic aberration diagram of the zoom lens at the telephoto end is shown. Figure 13 The vertical axis chromatic aberration curves for wavelengths of 436nm, 486nm, 546nm, 587nm, 656nm, and 850nm are shown. The vertical direction represents the field of view, 0 represents the optical axis, and the vertex in the vertical axis represents the maximum field of view. The dominant wavelength is 546nm, and the horizontal direction represents the offset relative to the dominant wavelength in micrometers (μm). Figure 13 It can be seen that the vertical chromatic aberration of different wavelengths is controlled within a small range, indicating that the vertical chromatic aberration of the zoom lens at the telephoto end is well controlled and can meet the application requirements under normal conditions.

[0171] Figure 14 yes Figure 2The axial aberration diagram of the zoom lens at the telephoto end is shown in the figure. Figure 14 The axial aberration curves for wavelengths of 436nm, 486nm, 546nm, 587nm, 656nm, and 850nm are shown. The vertical direction represents the normalized aperture, 0 represents the optical axis, and the vertex in the vertical axis represents the maximum pupil radius, which is 2.9608 mm. The dominant wavelength is 546nm, and the horizontal direction represents the offset relative to the dominant wavelength, in millimeters (mm). Figure 14 It can be seen that axial aberrations at various wavelengths, ranging from 0.3 to 1.0 normalized apertures, are all within reasonable ranges, demonstrating that vertical chromatic aberration at the telephoto end of this zoom lens is well controlled and meets operational requirements. Furthermore, at pupil positions of 0.5 to 0.9, there is no noticeable chromatic aberration between visible and infrared light, meeting the basic requirements for clear nighttime imaging and achieving sharp images across the entire wavelength range.

[0172] Figures 15 to 22 yes Figure 2 The ray fan diagram at the telephoto end of the zoom lens is shown in Figures 15 to 22 As shown, the horizontal axis is the normalized beam diameter, and the vertical axis is the vertical axis aberration. The ray fan diagram is one of the most commonly used evaluation methods in modern optical design. The most ideal curves are completely coincident with the horizontal axis. At this time, all light rays in the field of view are focused on the same point on the image plane. The corresponding interval on the vertical axis of the curve is the maximum dispersion range of the light beam on the ideal image plane. The ray fan diagram can not only reflect the monochromatic aberration of different wavelengths, but also indicate the size of the vertical axis chromatic aberration. Figures 15 to 22 It can be seen that the zoom lens at each wavelength in each field of view at the telephoto end is well aligned with the horizontal axis, indicating that the vertical axis aberration of each wavelength of the zoom lens is well corrected. At the same time, there is no obvious dispersion in the curves of each wavelength, indicating that the zoom lens is also well corrected for chromatic aberration, which can achieve high-resolution imaging requirements and meet the use needs of the zoom lens. Figure 15 yes Figure 2 The ray fan diagram shown is when the image plane is 0.0000mm at the telephoto end of the zoom lens. Figure 16 yes Figure 2 The ray fan diagram shown is when the image plane is 1.3800mm at the telephoto end of the zoom lens. Figure 17 yes Figure 2 The ray fan diagram shown is when the image plane is 2.3000mm at the telephoto end of the zoom lens. Figure 18 yes Figure 2 The ray fan diagram shown is when the image plane is 2.7600mm at the telephoto end of the zoom lens. Figure 19 yes Figure 2 The ray fan diagram shown is when the image plane is 3.2200mm at the telephoto end of the zoom lens. Figure 20 yes Figure 2 The ray fan diagram shown is when the image plane is 3.6800mm at the telephoto end of the zoom lens. Figure 21 yes Figure 2 The ray fan diagram shown is when the image plane is 4.1400mm at the telephoto end of the zoom lens. Figure 22 yes Figure 2 The ray fan diagram shown is when the image plane is 4.6000mm at the telephoto end of the zoom lens. Figures 15 to 22 Curves for light with a wavelength of 436 nm, light with a wavelength of 486 nm, light with a wavelength of 546 nm, light with a wavelength of 587 nm, light with a wavelength of 656 nm, and light with a wavelength of 859 nm are shown, with a maximum scaling of ±100.000 μm.

[0173] In another exemplary embodiment, Figure 23 is a schematic structural diagram of another zoom lens provided by an embodiment of the present invention at the wide-angle end. Figure 24 is a schematic structural diagram of another zoom lens provided by an embodiment of the present invention at the telephoto end. Table 6 describes in detail another feasible implementation method. Figure 23 and Figure 24 Specific parameters of the zoom lens shown.

[0174] Table 6 Another parameter design of zoom lens

[0175]

[0176] Table 7 shows the design parameters of a zoom lens, including lens surface type, curvature radius, thickness, and material, corresponding to Table 6.

[0177] Table 7 Another optical and physical parameter design of zoom lens

[0178]

[0179] like Figure 23 and Figure 24As shown, the zoom lens provided in this embodiment consists of 10 lenses and a flat glass lens CG, that is, the zoom lens includes a focus lens group G1 with negative optical power, an aperture STO, a variator lens group G2 with positive optical power, a fixed lens group G3 with positive or negative optical power, and a flat glass lens CG, which are arranged in sequence along the optical axis from the object side to the image side; the focus lens group G1 includes a first lens L1 with negative optical power, a second lens L2 with negative optical power, and a third lens L3 with positive optical power; the variator lens group G2 includes a first lens L1 with negative optical power, a second lens L2 with negative optical power, and a third lens L3 with positive optical power; The fixed lens group G3 consists of a tenth lens L10 with positive or negative optical power; the focusing lens group G1 and the zoom lens group G2 are arranged to move along the direction of the optical axis; when the focusing lens group G1 and the zoom lens group G2 move in coordination along the direction of the optical axis, the zoom lens is switched between the wide-angle end and the telephoto end.

[0180] The surface numbers in Table 7 are numbered according to the order of the surfaces of each lens. For example, surface number 1 represents the object-side surface of the first lens L1, surface number 2 represents the image-side surface of the first lens L1, and so on. "STO" represents the aperture stop of the zoom lens. The radius of curvature represents the degree of curvature of the corresponding lens surface, measured in mm. A positive value indicates that the surface is curved toward the image side, while a negative value indicates that the surface is curved toward the object side. "INF" indicates that the surface is flat and the radius of curvature is infinite. The thickness represents the axial distance from the center of the current surface to the next surface, measured in mm. The refractive index represents the ability of the material between the current surface and the next surface to deflect light. A blank space represents that the current position is air, with a refractive index of 1. The Abbe number represents the ability of the material between the current surface and the next surface to disperse light. A blank space represents that the current position is air, with an Abbe number of 1.

[0181] Table 8 shows the design parameters of the zoom interval at the wide-angle end and the telephoto end of a zoom lens corresponding to Table 7.

[0182] Table 8 Another zoom interval design for the wide-angle end and telephoto end of a zoom lens

[0183]

[0184] Table 9 shows the aspheric coefficient values ​​used in the current embodiment.

[0185] Table 9 Aspheric coefficients of another zoom lens

[0186]

[0187] Among them, -6.507187476931E-04 means that the coefficient A of face number 3 is -6.507187476931×10 -4 , and so on.

[0188] The k value in Table 9 represents the numerical value of the best-fit cone coefficient of the aspheric surface. The aspheric cone coefficient can be defined by the following aspheric formula, but is not limited to the following expression method:

[0189]

[0190] Among them, z is the axial sagittal height of the aspheric surface in the Z direction; r is the height of the aspheric surface; c is the curvature of the fitted sphere, which is the reciprocal of the curvature radius; k is the fitting cone coefficient; A, B, C, D, E, F, and G are the 4th, 6th, 8th, 10th, 12th, 14th, and 16th orders of the aspheric polynomial, respectively.

[0191] Based on the above parameter design, Table 10 shows the lens parameters of the zoom lens implemented in this embodiment.

[0192] Table 10 Lens parameters of another zoom lens

[0193]

[0194] Figure 25 yes Figure 23 The vertical axis chromatic aberration diagram of the zoom lens at the wide angle end is shown. Figure 25 The vertical axis chromatic aberration curves for wavelengths of 436nm, 486nm, 546nm, 587nm, 656nm, and 850nm are shown. The vertical direction represents the field of view, 0 represents the optical axis, and the vertical axis vertex represents the maximum field of view (4.6000mm). The dominant wavelength is 546nm, and the horizontal direction represents the offset relative to the dominant wavelength in micrometers (μm). Figure 25 It can be seen that the vertical chromatic aberration of different wavelengths is controlled within a small range, indicating that the vertical chromatic aberration of this zoom lens at the wide-angle end is well controlled and can meet the application requirements under normal conditions.

[0195] Figure 26 yes Figure 23 The axial aberration diagram of the zoom lens at the wide-angle end is shown below. Figure 26 The axial aberration curves for wavelengths of 436nm, 486nm, 546nm, 587nm, 656nm, and 850nm are shown. The vertical direction represents the normalized aperture, 0 represents the optical axis, and the vertex in the vertical axis represents the maximum pupil radius, which is 1.4495 mm. The dominant wavelength is 546nm, and the horizontal direction represents the offset relative to the dominant wavelength, in millimeters (mm). Figure 26It can be seen that axial aberrations at various wavelengths, ranging from 0.3 to 1.0 normalized apertures, are all within reasonable ranges, demonstrating that vertical chromatic aberration at the wide-angle end of this zoom lens is well controlled and meets operational requirements. Furthermore, at pupil positions of 0.5 to 0.9, there is no noticeable chromatic aberration between visible and infrared light, meeting the basic requirements for clear nighttime imaging and achieving sharp images across the entire wavelength range.

[0196] Figures 27 to 34 yes Figure 23 The ray fan diagram at the wide-angle end of the zoom lens is shown in Figures 27 to 34 As shown, the horizontal axis is the normalized beam diameter, and the vertical axis is the vertical axis aberration. The ray fan diagram is one of the most commonly used evaluation methods in modern optical design. The most ideal curves are completely coincident with the horizontal axis. At this time, all light rays in the field of view are focused on the same point on the image plane. The corresponding interval on the vertical axis of the curve is the maximum dispersion range of the light beam on the ideal image plane. The ray fan diagram can not only reflect the monochromatic aberration of different wavelengths, but also indicate the size of the vertical axis chromatic aberration. Figures 27 to 34 It can be seen that the zoom lens at each wavelength in each field of view at the wide-angle end is well aligned with the horizontal axis, indicating that the vertical axis aberration of each wavelength of the zoom lens is well corrected. At the same time, there is no obvious dispersion in the curves of each wavelength, indicating that the zoom lens is also well corrected for chromatic aberration, which can achieve high-resolution imaging requirements and meet the use needs of the zoom lens. Figure 27 yes Figure 23 The ray fan diagram shown is when the image plane is 0.0000mm at the wide-angle end of the zoom lens. Figure 28 yes Figure 23 The ray fan diagram of the zoom lens at the wide-angle end when the image plane is 1.3800mm is shown. Figure 29 yes Figure 23 The ray fan diagram of the zoom lens at the wide-angle end when the image plane is 2.3000mm is shown. Figure 30 yes Figure 23 The ray fan diagram of the zoom lens at the wide-angle end when the image plane is 2.7600mm is shown. Figure 31 yes Figure 23 The ray fan diagram of the zoom lens at the wide-angle end when the image plane is 3.2200mm is shown. Figure 32 yes Figure 23 The ray fan diagram of the zoom lens at the wide-angle end when the image plane is 3.6800mm is shown. Figure 33 yes Figure 23 The ray fan diagram of the zoom lens at the wide-angle end when the image plane is 4.1400mm is shown. Figure 34 yes Figure 23 The ray fan diagram shown is when the image plane is 4.6000mm at the wide-angle end of the zoom lens. Figures 27 to 34Curves for light with a wavelength of 436 nm, light with a wavelength of 486 nm, light with a wavelength of 546 nm, light with a wavelength of 587 nm, light with a wavelength of 656 nm, and light with a wavelength of 859 nm are shown, with a maximum scaling of ±100.000 μm.

[0197] Figure 35 yes Figure 24 The vertical axis chromatic aberration diagram of the zoom lens at the telephoto end is shown. Figure 35 The vertical axis chromatic aberration curves for wavelengths of 436nm, 486nm, 546nm, 587nm, 656nm, and 850nm are shown. The vertical direction represents the field of view, 0 represents the optical axis, and the vertex in the vertical axis represents the maximum field of view. The dominant wavelength is 546nm, and the horizontal direction represents the offset relative to the dominant wavelength in micrometers (μm). Figure 35 It can be seen that the vertical chromatic aberration of different wavelengths is controlled within a small range, indicating that the vertical chromatic aberration of the zoom lens at the telephoto end is well controlled and can meet the application requirements under normal conditions.

[0198] Figure 36 yes Figure 24 The axial aberration diagram of the zoom lens at the telephoto end is shown in the figure. Figure 36 The axial aberration curves for wavelengths of 436nm, 486nm, 546nm, 587nm, 656nm, and 850nm are shown. The vertical direction represents the normalized aperture, 0 represents the optical axis, and the vertex in the vertical axis represents the maximum pupil radius, which is 2.8785 mm. The dominant wavelength is 546nm, and the horizontal direction represents the offset relative to the dominant wavelength, in millimeters (mm). Figure 36 It can be seen that axial aberrations at various wavelengths, ranging from 0.3 to 1.0 normalized apertures, are all within reasonable ranges, demonstrating that vertical chromatic aberration at the telephoto end of this zoom lens is well controlled and meets operational requirements. Furthermore, at pupil positions of 0.5 to 0.9, there is no noticeable chromatic aberration between visible and infrared light, meeting the basic requirements for clear nighttime imaging and achieving sharp images across the entire wavelength range.

[0199] Figures 37 to 44 yes Figure 24 The ray fan diagram at the telephoto end of the zoom lens is shown in Figures 37 to 44 As shown, the horizontal axis is the normalized beam diameter, and the vertical axis is the vertical axis aberration. The ray fan diagram is one of the most commonly used evaluation methods in modern optical design. The most ideal curves are completely coincident with the horizontal axis. At this time, all light rays in the field of view are focused on the same point on the image plane. The corresponding interval on the vertical axis of the curve is the maximum dispersion range of the light beam on the ideal image plane. The ray fan diagram can not only reflect the monochromatic aberration of different wavelengths, but also indicate the size of the vertical axis chromatic aberration. Figures 37 to 44It can be seen that the zoom lens at each wavelength in each field of view at the telephoto end is well aligned with the horizontal axis, indicating that the vertical axis aberration of each wavelength of the zoom lens is well corrected. At the same time, there is no obvious dispersion in the curves of each wavelength, indicating that the zoom lens is also well corrected for chromatic aberration, which can achieve high-resolution imaging requirements and meet the use needs of the zoom lens. Figure 37 yes Figure 24 The ray fan diagram shown is when the image plane is 0.0000mm at the telephoto end of the zoom lens. Figure 38 yes Figure 24 The ray fan diagram shown is when the image plane is 1.3800mm at the telephoto end of the zoom lens. Figure 39 yes Figure 24 The ray fan diagram shown is when the image plane is 2.3000mm at the telephoto end of the zoom lens. Figure 40 yes Figure 24 The ray fan diagram shown is when the image plane is 2.7600mm at the telephoto end of the zoom lens. Figure 41 yes Figure 24 The ray fan diagram shown is when the image plane is 3.2200mm at the telephoto end of the zoom lens. Figure 42 yes Figure 24 The ray fan diagram shown is when the image plane is 3.6800mm at the telephoto end of the zoom lens. Figure 43 yes Figure 24 The ray fan diagram shown is when the image plane is 4.1400mm at the telephoto end of the zoom lens. Figure 44 yes Figure 24 The ray fan diagram shown is when the image plane is 4.6000mm at the telephoto end of the zoom lens. Figures 37 to 44 Curves for light with a wavelength of 436 nm, light with a wavelength of 486 nm, light with a wavelength of 546 nm, light with a wavelength of 587 nm, light with a wavelength of 656 nm, and light with a wavelength of 859 nm are shown, with a maximum scaling of ±100.000 μm.

[0200] In yet another exemplary embodiment, Figure 45 is a structural diagram of another zoom lens provided by an embodiment of the present invention at the wide-angle end. Figure 46 is a structural diagram of another zoom lens provided by an embodiment of the present invention at the telephoto end. Table 11 describes in detail another feasible implementation method. Figure 45 and Figure 46 Specific parameters of the zoom lens shown.

[0201] Table 11 Another parameter design of zoom lens

[0202]

[0203] Table 12 shows the design parameters of a zoom lens corresponding to Table 11, including lens surface type, curvature radius, thickness, and material.

[0204] Table 12 Another optical physical parameter design of zoom lens

[0205]

[0206] like Figure 45 and Figure 46 As shown, the zoom lens provided in this embodiment consists of 10 lenses and a flat glass lens CG, that is, the zoom lens includes a focus lens group G1 with negative optical power, an aperture STO, a variator lens group G2 with positive optical power, a fixed lens group G3 with positive or negative optical power, and a flat glass lens CG, which are arranged in sequence along the optical axis from the object side to the image side; the focus lens group G1 includes a first lens L1 with negative optical power, a second lens L2 with negative optical power, and a third lens L3 with positive optical power; the variator lens group G2 includes a first lens L1 with negative optical power, a second lens L2 with negative optical power, and a third lens L3 with positive optical power; The fixed lens group G3 consists of a tenth lens L10 with positive or negative optical power; the focusing lens group G1 and the zoom lens group G2 are arranged to move along the direction of the optical axis; when the focusing lens group G1 and the zoom lens group G2 move in coordination along the direction of the optical axis, the zoom lens is switched between the wide-angle end and the telephoto end.

[0207] The surface numbers in Table 12 are numbered according to the order of the surfaces of each lens. For example, surface number 1 represents the object-side surface of the first lens L1, surface number 2 represents the image-side surface of the first lens L1, and so on. "STO" represents the aperture stop of the zoom lens. The radius of curvature represents the degree of curvature of the corresponding lens surface, measured in mm. A positive value indicates that the surface is curved toward the image side, while a negative value indicates that the surface is curved toward the object side. "INF" indicates that the surface is flat and the radius of curvature is infinite. The thickness represents the axial distance from the center of the current surface to the next surface, measured in mm. The refractive index represents the ability of the material between the current surface and the next surface to refract light. A blank space represents that the current position is air, with a refractive index of 1. The Abbe number represents the ability of the material between the current surface and the next surface to disperse light. A blank space represents that the current position is air, with an Abbe number of 1.

[0208] Table 13 shows the design parameters of the zoom interval at the wide-angle end and the telephoto end of a zoom lens corresponding to Table 12.

[0209] Table 13 Another zoom interval design for the wide-angle and telephoto ends of a zoom lens

[0210]

[0211] Table 14 shows the aspheric coefficient values ​​used in the present embodiment.

[0212] Table 14 Aspheric coefficients of another zoom lens

[0213]

[0214] Among them, -7.322464458788E-04 means that the coefficient A of face number 3 is -7.322464458788×10 -4 , and so on.

[0215] The k values ​​in Table 14 represent the numerical values ​​of the best-fit conic coefficients of the aspheric surface. The aspheric conic coefficients can be defined by the following aspheric formula, but are not limited to the following representations:

[0216]

[0217] Among them, z is the axial sagittal height of the aspheric surface in the Z direction; r is the height of the aspheric surface; c is the curvature of the fitted sphere, which is the reciprocal of the curvature radius; k is the fitting cone coefficient; A, B, C, D, E, F, and G are the 4th, 6th, 8th, 10th, 12th, 14th, and 16th orders of the aspheric polynomial, respectively.

[0218] Based on the above parameter design, Table 15 shows the lens parameters of the zoom lens implemented in this embodiment.

[0219] Table 15 Lens parameters of another zoom lens

[0220]

[0221] Figure 47 yes Figure 45 The vertical axis chromatic aberration diagram of the zoom lens at the wide angle end is shown. Figure 47 The vertical axis chromatic aberration curves for wavelengths of 436nm, 486nm, 546nm, 587nm, 656nm, and 850nm are shown. The vertical direction represents the field of view, 0 represents the optical axis, and the vertical axis vertex represents the maximum field of view (4.6000mm). The dominant wavelength is 546nm, and the horizontal direction represents the offset relative to the dominant wavelength in micrometers (μm). Figure 47 It can be seen that the vertical chromatic aberration of different wavelengths is controlled within a small range, indicating that the vertical chromatic aberration of this zoom lens at the wide-angle end is well controlled and can meet the application requirements under normal conditions.

[0222] Figure 48 yes Figure 45 The axial aberration diagram of the zoom lens at the wide-angle end is shown below. Figure 48The axial aberration curves for wavelengths of 436nm, 486nm, 546nm, 587nm, 656nm, and 850nm are shown. The vertical direction represents the normalized aperture, 0 represents the optical axis, and the vertex in the vertical axis represents the maximum pupil radius, which is 1.4742 mm. The dominant wavelength is 546nm, and the horizontal direction represents the offset relative to the dominant wavelength, in millimeters (mm). Figure 48 It can be seen that axial aberrations at various wavelengths, ranging from 0.3 to 1.0 normalized apertures, are all within reasonable ranges, demonstrating that vertical chromatic aberration at the wide-angle end of this zoom lens is well controlled and meets operational requirements. Furthermore, at pupil positions of 0.5 to 0.9, there is no noticeable chromatic aberration between visible and infrared light, meeting the basic requirements for clear nighttime imaging and achieving sharp images across the entire wavelength range.

[0223] Figures 49 to 56 yes Figure 45 The ray fan diagram at the wide-angle end of the zoom lens is shown in Figures 49 to 56 As shown, the horizontal axis is the normalized beam diameter, and the vertical axis is the vertical axis aberration. The ray fan diagram is one of the most commonly used evaluation methods in modern optical design. The most ideal curves are completely coincident with the horizontal axis. At this time, all light rays in the field of view are focused on the same point on the image plane. The corresponding interval on the vertical axis of the curve is the maximum dispersion range of the light beam on the ideal image plane. The ray fan diagram can not only reflect the monochromatic aberration of different wavelengths, but also indicate the size of the vertical axis chromatic aberration. Figures 49 to 56 It can be seen that the zoom lens at each wavelength in each field of view at the wide-angle end is well aligned with the horizontal axis, indicating that the vertical axis aberration of each wavelength of the zoom lens is well corrected. At the same time, there is no obvious dispersion in the curves of each wavelength, indicating that the zoom lens is also well corrected for chromatic aberration, which can achieve high-resolution imaging requirements and meet the use needs of the zoom lens. Figure 49 yes Figure 45 The ray fan diagram shown is when the image plane is 0.0000mm at the wide-angle end of the zoom lens. Figure 50 yes Figure 45 The ray fan diagram of the zoom lens at the wide-angle end when the image plane is 1.3800mm is shown. Figure 51 yes Figure 45 The ray fan diagram of the zoom lens at the wide-angle end when the image plane is 2.3000mm is shown. Figure 52 yes Figure 45 The ray fan diagram of the zoom lens at the wide-angle end when the image plane is 2.7600mm is shown. Figure 53 yes Figure 45 The ray fan diagram of the zoom lens at the wide-angle end when the image plane is 3.2200mm is shown. Figure 54 yes Figure 45 The ray fan diagram of the zoom lens at the wide-angle end when the image plane is 3.6800mm is shown. Figure 55 yes Figure 45The ray fan diagram of the zoom lens at the wide-angle end when the image plane is 4.1400mm is shown. Figure 56 yes Figure 45 The ray fan diagram shown is when the image plane is 4.6000mm at the wide-angle end of the zoom lens. Figures 49 to 56 Curves for light with a wavelength of 436 nm, light with a wavelength of 486 nm, light with a wavelength of 546 nm, light with a wavelength of 587 nm, light with a wavelength of 656 nm, and light with a wavelength of 859 nm are shown, with a maximum scaling of ±100.000 μm.

[0224] Figure 57 yes Figure 46 The vertical axis chromatic aberration diagram of the zoom lens at the telephoto end is shown. Figure 57 The vertical axis chromatic aberration curves for wavelengths of 436nm, 486nm, 546nm, 587nm, 656nm, and 850nm are shown. The vertical direction represents the field of view, 0 represents the optical axis, and the vertex in the vertical axis represents the maximum field of view. The dominant wavelength is 546nm, and the horizontal direction represents the offset relative to the dominant wavelength in micrometers (μm). Figure 57 It can be seen that the vertical chromatic aberration of different wavelengths is controlled within a small range, indicating that the vertical chromatic aberration of the zoom lens at the telephoto end is well controlled and can meet the application requirements under normal conditions.

[0225] Figure 58 yes Figure 46 The axial aberration diagram of the zoom lens at the telephoto end is shown in the figure. Figure 58 The axial aberration curves for wavelengths of 436nm, 486nm, 546nm, 587nm, 656nm, and 850nm are shown. The vertical direction represents the normalized aperture, 0 represents the optical axis, and the vertex in the vertical axis represents the maximum pupil radius, which is 2.9502 mm. The dominant wavelength is 546nm, and the horizontal direction represents the offset relative to the dominant wavelength, in millimeters (mm). Figure 58 It can be seen that axial aberrations at various wavelengths, ranging from 0.3 to 1.0 normalized apertures, are all within reasonable ranges, demonstrating that vertical chromatic aberration at the telephoto end of this zoom lens is well controlled and meets operational requirements. Furthermore, at pupil positions of 0.5 to 0.9, there is no noticeable chromatic aberration between visible and infrared light, meeting the basic requirements for clear nighttime imaging and achieving sharp images across the entire wavelength range.

[0226] Figures 59 to 66 yes Figure 46 The ray fan diagram at the telephoto end of the zoom lens is shown in Figures 59 to 66As shown, the horizontal axis is the normalized beam diameter, and the vertical axis is the vertical axis aberration. The ray fan diagram is one of the most commonly used evaluation methods in modern optical design. The most ideal curves are completely coincident with the horizontal axis. At this time, all light rays in the field of view are focused on the same point on the image plane. The corresponding interval on the vertical axis of the curve is the maximum dispersion range of the light beam on the ideal image plane. The ray fan diagram can not only reflect the monochromatic aberration of different wavelengths, but also indicate the size of the vertical axis chromatic aberration. Figures 59 to 66 It can be seen that the zoom lens at each wavelength in each field of view at the telephoto end is well aligned with the horizontal axis, indicating that the vertical axis aberration of each wavelength of the zoom lens is well corrected. At the same time, there is no obvious dispersion in the curves of each wavelength, indicating that the zoom lens is also well corrected for chromatic aberration, which can achieve high-resolution imaging requirements and meet the use needs of the zoom lens. Figure 59 yes Figure 46 The ray fan diagram shown is when the image plane is 0.0000mm at the telephoto end of the zoom lens. Figure 60 yes Figure 46 The ray fan diagram shown is when the image plane is 1.3800mm at the telephoto end of the zoom lens. Figure 61 yes Figure 46 The ray fan diagram shown is when the image plane is 2.3000mm at the telephoto end of the zoom lens. Figure 62 yes Figure 46 The ray fan diagram shown is when the image plane is 2.7600mm at the telephoto end of the zoom lens. Figure 63 yes Figure 46 The ray fan diagram shown is when the image plane is 3.2200mm at the telephoto end of the zoom lens. Figure 64 yes Figure 46 The ray fan diagram shown is when the image plane is 3.6800mm at the telephoto end of the zoom lens. Figure 65 yes Figure 46 The ray fan diagram shown is when the image plane is 4.1400mm at the telephoto end of the zoom lens. Figure 66 yes Figure 46 The ray fan diagram shown is when the image plane is 4.6000mm at the telephoto end of the zoom lens. Figures 59 to 66 Curves for light with a wavelength of 436 nm, light with a wavelength of 486 nm, light with a wavelength of 546 nm, light with a wavelength of 587 nm, light with a wavelength of 656 nm, and light with a wavelength of 859 nm are shown, with a maximum scaling of ±100.000 μm.

[0227] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A zoom lens, characterized in that: include: A focusing lens group with negative optical power, an aperture, a variable magnification lens group with positive optical power, and a fixed lens group with positive or negative optical power are arranged in sequence along the optical axis from the object side to the image side; The focusing lens group includes a first lens with negative optical power, a second lens with negative optical power, and a third lens with positive optical power; The zoom lens assembly includes a fourth lens with positive optical power, a fifth lens with positive optical power, a sixth lens with negative optical power, a seventh lens with positive optical power, an eighth lens with negative optical power, and a ninth lens with positive optical power; The fixed lens group is composed of a tenth lens with positive or negative optical power; The focus lens group and the zoom lens group are arranged to move along the direction of the optical axis; when the focus lens group and the zoom lens group move in coordination along the direction of the optical axis, the zoom lens is switched between the wide-angle end and the telephoto end.

2. The zoom lens according to claim 1, wherein: In the focusing lens group, The object-side surface of the first lens is convex, and the image-side surface of the first lens is concave; The object-side surface of the second lens is convex, and the image-side surface of the second lens is concave; The object-side surface of the third lens is convex, and the image-side surface of the third lens is concave; In the variable magnification lens group, The object-side surface of the fourth lens is convex, and the image-side surface of the fourth lens is convex; The object-side surface of the fifth lens is convex, and the image-side surface of the fifth lens is convex; The object-side surface of the sixth lens is concave, and the image-side surface of the sixth lens is concave; The object-side surface of the seventh lens is convex, and the image-side surface of the seventh lens is concave; The object-side surface of the eighth lens is concave, and the image-side surface of the eighth lens is convex; The object-side surface of the ninth lens is convex, and the image-side surface of the ninth lens is concave; In the fixed lens group, The object-side surface of the tenth lens is concave, and the image-side surface of the tenth lens is convex.

3. The zoom lens according to claim 1, wherein: The second lens, the third lens, the eighth lens, the ninth lens and the tenth lens are all plastic aspherical lenses; The fourth lens is a glass aspherical lens.

4. The zoom lens according to claim 1, wherein: The aperture number of the zoom lens at the wide-angle end is FNO1 ≥ 1.505; The aperture number of the zoom lens at the telephoto end is FNO2≤2.

513.

5. The zoom lens according to claim 1, wherein: -2.74≤FG1 / FW≤-2.67; 2.38≤FG2 / FW≤2.45; -140.14≤FG3 / FW≤393.20; Among them, FG1 is the focal length of the focusing lens group, FG2 is the focal length of the zoom lens group, FG3 is the focal length of the fixed lens group, and FW is the focal length of the zoom lens at the wide-angle end.

6. The zoom lens according to claim 1, wherein: -0.85≤FG1 / FT≤-0.84; 0.74≤FG2 / FT≤0.77; -43.89≤FG3 / FT≤123.16; Among them, FG1 is the focal length of the focusing lens group, FG2 is the focal length of the zoom lens group, FG3 is the focal length of the fixed lens group, and FT is the focal length of the zoom lens at the telephoto end.

7. The zoom lens according to claim 1, wherein: 0.73≤S2 / S1≤0.78 Among them, S1 is the maximum distance that the focusing lens group can move, and S2 is the maximum distance that the zoom lens group can move.

8. The zoom lens according to claim 1, wherein: The fifth lens, the sixth lens and the seventh lens form a cemented lens group; Among them, -41.69≤F567 / FG2≤9.36; F567 represents the combined focal length of the fifth lens, the sixth lens, and the seventh lens, and FG2 represents the focal length of the zoom lens group.

9. The zoom lens according to claim 1, wherein: 1.438≤nd4≤1.504;81.244≤vd4≤81.853; 1.520≤nd5≤1.60;68.937≤vd5≤77.316; 1.443≤nd7≤1.499;90.023≤vd7≤95.413; Among them, nd4 is the refractive index of the fourth lens, vd4 is the Abbe number of the fourth lens; nd5 is the refractive index of the fifth lens, vd5 is the Abbe number of the fifth lens; nd7 is the refractive index of the seventh lens, vd7 is the Abbe number of the seventh lens.

10. The zoom lens according to claim 1, wherein 3.19≤FT / FW≤3.24; Wherein, FW represents the focal length of the zoom lens at the wide-angle end, and FT represents the focal length of the zoom lens at the telephoto end.

11. The zoom lens according to claim 1, wherein 5.97≤TTL / S2≤6.20; Wherein, TTL represents the total length of the optical system of the zoom lens at the wide-angle end, and S2 represents the maximum distance that the zoom lens group can move.

Images