Zoom lens and imaging apparatus

Abstract

The application discloses a zoom lens and an imaging device, the zoom lens comprising a lens barrel and an optical assembly, the optical assembly being arranged in the lens barrel, the optical assembly comprising a first lens group, a second lens group, a third lens group, a fourth lens group and a fifth lens group which are sequentially and spacedly arranged from an object side to an image side, the first lens group having positive refractive power, the first lens group being provided with four lenses and being fixedly installed on the lens barrel; the second lens group having negative refractive power, the second lens group being provided with three lenses and being movably installed on the lens barrel along an optical axis direction; the third lens group having positive refractive power, the third lens group being provided with three lenses and being fixedly installed on the lens barrel; the fourth lens group having positive refractive power, the fourth lens group being provided with three lenses and being movably installed on the lens barrel along the optical axis direction; and the fifth lens group being fixedly installed on the lens barrel; and the application aims to solve the problem of high manufacturing cost of the existing zoom lens.

Description

Technical Field

[0001] The present invention relates to the technical field of optical system design, and particularly relates to a zoom lens and an imaging device. Background Art

[0002] At present, the mainstream high-image-quality surveillance system zoom lenses on the market generally use multiple glass aspherical lenses to improve the lens resolution, but the manufacturing cost is relatively high. At present, the surveillance system zoom lenses are developing towards the direction of household and low cost. Therefore, the surveillance lenses with high manufacturing costs can no longer meet the market demand. Summary of the Invention

[0003] The main object of the present invention is to provide a zoom lens and an imaging device, aiming to solve the problem of relatively high manufacturing cost of existing zoom lenses.

[0004] To achieve the above object, a zoom lens provided by the present invention includes a lens barrel and an optical component. The optical component is disposed in the lens barrel. The lens has an object side and an image side that are oppositely arranged in the direction of the optical axis extension. The optical component includes a first lens group, a second lens group, a third lens group, a fourth lens group, and a fifth lens group that are sequentially arranged at intervals from the object side to the image side. Among them:

[0005] The first lens group has a positive optical power. The first lens group is provided with four lenses and is fixedly installed on the lens barrel;

[0006] The second lens group has a negative optical power. The second lens group is provided with three lenses and is movably installed on the lens barrel along the optical axis direction;

[0007] The third lens group has a positive optical power. The third lens group is provided with three lenses and is fixedly installed on the lens barrel;

[0008] The fourth lens group has a positive optical power. The fourth lens group is provided with three lenses and is movably installed on the lens barrel along the optical axis direction;

[0009] The fifth lens group is fixedly installed on the lens barrel;

[0010] The optical component satisfies the following conditions: 0.097 < fw / f1 < 0.145, and -0.825 < fw / f2 < -0.55, and 0.163 < fw / f3 < 0.245, and 0.236 < fw / f4 < 0.354, and -0.1 < fw / f5 < 0.1;

[0011] The focal length of the zoom lens at the wide-angle end is fw, the focal length of the first lens group is f1, the focal length of the second lens group is f2, the focal length of the third lens group is f3, the focal length of the fourth lens group is f4, and the focal length of the fifth lens group is f5.

[0012] Optionally, the first lens group comprises four lenses: a first lens, a second lens, a third lens, and a fourth lens, arranged sequentially and at intervals from the object side to the image side; wherein:

[0013] The first lens has negative optical power, the first lens is a glass spherical lens, and the focal length of the first lens is f11;

[0014] The second lens has positive optical power, the second lens is a glass spherical lens, and the focal length of the second lens is f12;

[0015] The third lens has positive optical power, the third lens is a glass spherical lens, and the focal length of the third lens is f13;

[0016] The fourth lens has positive optical power, the fourth lens is a glass spherical lens, and the focal length of the fourth lens is f14;

[0017] The first lens group satisfies the following condition: -0.738 <f1 / f11<-0.492,0.502<f1 / f12<0.754,0.472<f1 / f13<0.708,0.363<f1 / f14<0.545。

[0018] Optionally, the effective aperture of the first lens is The total optical length of the zoom lens is TTL, and within the zoom lens:

[0019] Optionally, the second lens group comprises a fifth lens, a sixth lens, and a seventh lens, arranged sequentially and at intervals from the object side to the image side; wherein:

[0020] The fifth lens has negative optical power, the fifth lens is a glass spherical lens, and the focal length of the fifth lens is f21;

[0021] The sixth lens has negative optical power, the sixth lens is a plastic aspherical lens, and the focal length of the sixth lens is f22;

[0022] The seventh lens has positive optical power, the seventh lens is a plastic aspherical lens, and the focal length of the seventh lens is f23;

[0023] The second lens group satisfies the following conditions: 0.681 < f2 / f21 < 1.021, 0.474 < f2 / f22 < 0.711, and -0.528 < f2 / f23 < -0.352.

[0024] Optionally, when the zoom lens is in the wide-angle end position, the relative displacement amount of the fifth lens with respect to when the zoom lens is in the telephoto end position is ΔZ W-T , the total optical length of the zoom lens is TTL, and within the zoom lens: 0.279 < ΔZ W-T / TTL < 0.362.

[0025] Optionally, the three lenses of the third lens group include an eighth lens, a ninth lens, and a tenth lens that are sequentially spaced from the object side to the image side; where:

[0026] The eighth lens has a positive optical power, the eighth lens is a glass spherical lens, and the focal length of the eighth lens is f31;

[0027] The ninth lens has a positive optical power, the ninth lens is a glass spherical lens, and the focal length of the ninth lens is f32;

[0028] The tenth lens has a negative optical power, the tenth lens is a plastic aspherical lens, and the focal length of the tenth lens is f33;

[0029] The third lens group satisfies the following conditions: 0.698 < f3 / f31 < 1.047, 0.475 < f3 / f32 < 0.712, -0.804 < f3 / f33 < -0.536.

[0030] Optionally, the three lenses of the fourth lens group include an eleventh lens, a twelfth lens, and a thirteenth lens that are sequentially spaced from the object side to the image side; where:

[0031] The eleventh lens has a positive optical power, the eleventh lens is a plastic aspherical lens, and the focal length of the eleventh lens is f41;

[0032] The twelfth lens has a negative optical power, the twelfth lens is a plastic aspherical lens, and the focal length of the twelfth lens is f42;

[0033] The thirteenth lens has a positive optical power, the thirteenth lens is a plastic aspherical lens, and the focal length of the thirteenth lens is f43;

[0034] The third lens group satisfies the following conditions: 0.081 < f4 / f41 < 0.122, -0.813 < f4 / f42 < -0.542, 1.279 < f4 / f43 < 1.919.

[0035] Optionally, the fifth lens group includes a fourteenth lens, and the fourteenth lens is a plastic aspherical lens.

[0036] Optionally, the optical component further includes an aperture, and the aperture is located between the second lens group and the third lens group;

[0037] Wherein, in the extending direction of the optical axis, the distance from the aperture to the imaging surface of the zoom lens is L, and the overall optical length of the zoom lens is TTL. Within the zoom lens: 0.332 < L / TTL < 0.449.

[0038] In addition, the present invention further provides an imaging device, including the above-mentioned zoom lens. The zoom lens includes a lens barrel and an optical component. The optical component is disposed in the lens barrel. The lens has an object side and an image side that are oppositely arranged in the extending direction of the optical axis. The optical component includes a first lens group, a second lens group, a third lens group, a fourth lens group, and a fifth lens group that are sequentially spaced from the object side to the image side, wherein:

[0039] The first lens group has a positive optical power. The first lens group is provided with four lenses and is fixedly installed on the lens barrel;

[0040] The second lens group has a negative optical power. The second lens group is provided with three lenses and is movably installed on the lens barrel along the optical axis direction;

[0041] The third lens group has a positive optical power. The third lens group is provided with three lenses and is fixedly installed on the lens barrel;

[0042] The fourth lens group has a positive optical power. The fourth lens group is provided with three lenses and is movably installed on the lens barrel along the optical axis direction;

[0043] The fifth lens group is fixedly installed on the lens barrel;

[0044] The optical component satisfies the following conditions: 0.097 < fw / f1 < 0.145, and -0.825 < fw / f2 < -0.55, and 0.163 < fw / f3 < 0.245, and 0.236 < fw / f4 < 0.354, and -0.1 < fw / f5 < 0.1;

[0045] The focal length of the wide-angle end of the zoom lens is fw, the focal length of the first lens group is f1, the focal length of the second lens group is f2, the focal length of the third lens group is f3, the focal length of the fourth lens group is f4, and the focal length of the fifth lens group is f5.

[0046] In the technical solution provided by this invention, the first lens group, the third lens group, and the fifth lens group are fixedly installed in the lens barrel, while the second lens group and the fourth lens group are movably installed in the housing along the optical axis. Under the action of an external force, the second lens group moves towards the image side, so that the zoom lens zooms from the wide-angle end to the telephoto end. At the same time, the fourth lens group moves along the optical axis, so that the zoom lens focuses, thereby keeping the imaging plane clear during the zoom process. Furthermore, the first lens group has positive optical power, the second lens group has negative optical power, the third lens group has positive optical power, the fourth lens group has positive optical power, and the optical power of the fifth lens group can be either positive or negative. Through the reasonable arrangement of the five lens groups, the conditional limitation of the focal length ratio of each lens group at the wide-angle end of the zoom lens, and the selection of plastic aspherical surfaces, the problem of high manufacturing cost of existing large-magnification zoom lenses is solved. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0048] Figure 1 A schematic diagram of the zoom lens provided by the present invention when it is at the wide-angle end;

[0049] Figure 2 for Figure 1 A schematic diagram of the structure of a zoom lens at the intermediate magnification.

[0050] Figure 3 for Figure 1 A schematic diagram of the zoom lens in the telephoto end;

[0051] Figure 4 for Figure 1 Spherical aberration diagram of a zoom lens at the wide-angle end;

[0052] Figure 5 for Figure 1 Field curvature diagram of a zoom lens at the wide-angle end;

[0053] Figure 6 for Figure 1 The distortion image when the zoom lens is at the wide-angle end;

[0054] Figure 7 for Figure 1 Spherical aberration diagram of a zoom lens at intermediate magnification;

[0055] Figure 8 for Figure 1 Field curvature diagram of a zoom lens at intermediate magnification;

[0056] Figure 9 for Figure 1 The distortion image of a zoom lens at the middle magnification;

[0057] Figure 10 for Figure 1 Spherical aberration diagram of a zoom lens at the telephoto end;

[0058] Figure 11 for Figure 1 Field curvature diagram when the zoom lens is at the telephoto end;

[0059] Figure 12 for Figure 1 The distortion image of the zoom lens at the telephoto end.

[0060] Explanation of icon numbers:

[0061]

[0062]

[0063] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0064] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0065] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0066] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0067] Currently, mainstream high-resolution zoom lenses for surveillance systems typically use multiple aspherical glass lenses to improve lens resolution, but this results in higher manufacturing costs. However, the trend in surveillance system zoom lenses is towards home use and lower costs, meaning that expensive lenses can no longer meet market demands.

[0068] In view of this, the present invention provides a zoom lens, Figures 1 to 12 This invention provides an embodiment of a zoom lens in which all aspherical lenses are plastic lenses, resulting in lower manufacturing costs. This solves the problem of high manufacturing costs in existing zoom lenses and allows for widespread use in imaging devices such as surveillance cameras and video cameras. The zoom lens will be described below with reference to the accompanying drawings.

[0069] Please see Figure 1 , Figure 2 and Figure 3 This invention proposes a zoom lens 100, which includes a lens barrel and an optical assembly. The optical assembly is disposed in the lens barrel. The lens has an object side and a mirror side that are arranged opposite to each other along the optical axis. The optical assembly includes a first lens group 1, a second lens group 2, a third lens group 3, a fourth lens group 4, and a fifth lens group 5 arranged sequentially from the object side to the image side. Specifically: the first lens group 1 has positive optical power, has four lenses, and is fixedly mounted on the lens barrel; the second lens group 2 has negative optical power, has three lenses, and is movably mounted on the lens barrel along the optical axis; the third lens group 3 has positive optical power, has three lenses, and is fixedly mounted on the lens barrel; the fourth lens group 4 has positive optical power, has three lenses, and is movably mounted on the lens barrel along the optical axis; and the fifth lens group 5 has positive optical power and is fixedly mounted on the lens barrel.

[0070] In the technical solution provided by the present invention, the first lens group 1, the third lens group 3, and the fifth lens group 5 are fixedly installed on the lens barrel, and the second lens group 2 and the fourth lens group 4 are movably installed on the housing along the optical axis direction. Among them, under the action of an external force, the second lens group 2 moves toward the image side to make the zoom lens 100 zoom from the wide-angle end to the telephoto end. At the same time, the fourth lens group 4 moves along the optical axis direction to make the zoom lens 100 focus, so that the imaging surface of the zoom lens 100 remains clear during the zoom process. And the first lens group 1 has a positive optical power, the second lens group 2 has a negative optical power, the third lens group 3 has a positive optical power, the fourth lens group 4 has a positive optical power, and the optical power of the fifth lens group 5 can be positive or negative. Through the reasonable setting of the five lens groups, the ratio of the focal length of the wide-angle end of the zoom lens 100 to the focal lengths of each lens group is conditionally restricted, and plastic aspherical surfaces are selected to solve the problem of high manufacturing cost of existing large-magnification zoom lenses.

[0071] Specifically, in this embodiment, the optical components satisfy the following conditions: 0.097 < fw / f1 < 0.145, and -0.825 < fw / f2 < -0.55, and 0.163 < fw / f3 < 0.245, and 0.236 < fw / f4 < 0.354, and -0.1 < fw / f5 < 0.1; where, the focal length of the zoom lens 100 is fw, the focal length of the first lens group 1 is f1, the focal length of the second lens group 2 is f2, the focal length of the third lens group 3 is f3, the focal length of the fourth lens group 4 is f4, and the focal length of the fifth lens group 5 is f5. Specifically, in this embodiment, the ratios of the focal length of the zoom lens 100 at the wide-angle end to the focal lengths of each lens group are as follows: fw / f1 = 0.12; fw / f2 = -0.66; fw / f3 = 0.20; fw / f4 = 0.28; fw / f5 = 0.04. By reasonably distributing the optical power of the entire lens, the chromatic aberration between lenses is mutually compensated. When the entrance pupil diameter increases, high color reproducibility can still be ensured, and good imaging effects can be obtained even in environments with weak light.

[0072] It should be noted that both the second lens group 2 and the fourth lens group 4 can be driven by an external force to move along the optical axis direction. Among them, the external force drive can be a drive motor drive or manual adjustment by a human, which is not limited here.

[0073] Please continue to refer to Figure 1 、 Figure 2 and Figure 3, in this embodiment, the four lenses of the first lens group 1 include a first lens 11, a second lens 12, a third lens 13, and a fourth lens 14 that are sequentially arranged at intervals from the object side to the image side; where: the first lens 11 has a negative optical power, the first lens 11 is a glass spherical lens, and the focal length of the first lens 11 is f11; the second lens 12 has a positive optical power, the second lens 12 is a glass spherical lens, and the focal length of the second lens 12 is f12; the third lens 13 has a positive optical power, the third lens 13 is a glass spherical lens, and the focal length of the third lens 13 is f13; the fourth lens 14 has a positive optical power, the fourth lens 14 is a glass spherical lens, and the focal length of the fourth lens 14 is f14; the first lens group 1 satisfies the following conditions: -0.738 < f1 / f11 < -0.492, 0.502 < f1 / f12 < 0.754, 0.472 < f1 / f13 < 0.708, 0.363 < f1 / f14 < 0.545. Specifically, in this embodiment, the focal length of the first lens group 1 is 44.0, the focal length of the first lens 11 is -74.6, the focal length of the second lens 12 is 73.0, the focal length of the third lens 13 is 77.7, the focal length of the fourth lens 14 is 101.0, f1 / f11 = -0.59, f1 / f12 = 0.60, f1 / f13 = 0.57, f1 / f14 = 0.44. The first lens 11, the second lens 12, the third lens 13, and the fourth lens 14 are all glass spherical lenses. Using glass spherical lenses can ensure the resolution ability of the zoom lens 100.

[0074] Furthermore, in this embodiment, the first lens 11 and the second lens 12 are glued together to form a first glued lens with positive optical power; thus, by reasonably using the glue piece, the optical components can improve the image quality of the optical system, reduce light energy loss, increase imaging clarity, protect the scale surface, and further optimize the processing process to meet the design requirements.

[0075] Furthermore, in this embodiment, the effective clear aperture of the first lens 11 is The overall optical length of the zoom lens 100 is TTL. Inside the zoom lens 100: Specifically, in this embodiment, the effective clear aperture of the first lens 11 is 40.0 mm, the overall optical length of the zoom lens 100 is 92.0 mm. Inside the zoom lens 100:

[0076] Specifically, the three lenses of the second lens group 2 include a fifth lens 21, a sixth lens 22, and a seventh lens 23 that are sequentially arranged at intervals from the object side to the image side; where: the fifth lens 21 has a negative optical power, the fifth lens 21 is a glass spherical lens, and the focal length of the fifth lens 21 is f21; the sixth lens 22 has a negative optical power, the sixth lens 22 is a plastic aspherical lens, and the focal length of the sixth lens 22 is f22; the seventh lens 23 has a positive optical power, the seventh lens 23 is a plastic aspherical lens, and the focal length of the seventh lens 23 is f23; the second lens group 2 satisfies the following conditions: 0.681 < f2 / f21 < 1.021, 0.474 < f2 / f22 < 0.711, and -0.528 < f2 / f23 < -0.352. Specifically, in this embodiment, the focal length of the second lens group 2 is -7.7, the focal length of the fifth lens 21 is -9.5, the focal length of the sixth lens 22 is -13.6, the focal length of the seventh lens 23 is 18.3, f2 / f21 = 0.82, f2 / f22 = 0.57, f2 / f23 = -0.42; the fifth lens 21 is a glass spherical lens, and the sixth lens 22 and the seventh lens 23 are plastic aspherical lenses. The combination of the two realizes low cost and improves the resolution ability of the lens.

[0077] Further, when the zoom lens 100 is in the wide-angle end position, the relative displacement amount of the fifth lens 21 with respect to when the zoom lens 100 is in the telephoto end position is ΔZ W-T , and the overall optical length of the zoom lens 100 is TTL. Inside the zoom lens 100: 0.279 < ΔZ W-T / TTL < 0.362; specifically, in this embodiment, when the zoom lens 100 is in the wide-angle end position, the relative displacement amount of the fifth lens 21 with respect to when the zoom lens 100 is in the telephoto end position is 29.4 mm, the overall optical length of the zoom lens 100 is 92.0 mm. Inside the zoom lens 100: ΔZ W-T / TTL = 0.32.

[0078] Please continue to refer to Figures 1 to 3, the three lenses of the third lens group 3 include an eighth lens 31, a ninth lens 32, and a tenth lens 33 that are sequentially spaced from the object side to the image side; where: the eighth lens 31 has a positive optical power, the eighth lens 31 is a glass spherical lens, and the focal length of the eighth lens 31 is f31; the ninth lens 32 has a positive optical power, the ninth lens 32 is a glass spherical lens, and the focal length of the ninth lens 32 is f32; the tenth lens 33 has a negative optical power, the tenth lens 33 is a plastic aspherical lens, and the focal length of the tenth lens 33 is f33; the third lens group 3 satisfies the following conditions: 0.698 < f3 / f31 < 1.047, 0.475 < f3 / f32 < 0.712, -0.804 < f3 / f33 < -0.536. Specifically, in this embodiment, the focal length of the third lens group 3 is 26.1, the focal length of the eighth lens 31 is 31.1, the focal length of the ninth lens 32 is 45.7, the focal length of the tenth lens 33 is -40.5, f3 / f31 = 0.84, f3 / f32 = 0.57, f3 / f33 = -0.64.

[0079] Please continue to refer to Figure 1 , Figure 2 and Figure 3 , the three lenses of the fourth lens group 4 are an eleventh lens 41, a twelfth lens 42, and a thirteenth lens 43 that are sequentially spaced from the object side to the image side; where: the eleventh lens 41 has a positive optical power, the eleventh lens 41 is a plastic aspherical lens, and the focal length of the eleventh lens 41 is f41; the twelfth lens 42 has a negative optical power, the twelfth lens 42 is a plastic aspherical lens, and the focal length of the twelfth lens 42 is f42; the thirteenth lens 43 has a positive optical power, the thirteenth lens 43 is a plastic aspherical lens, and the focal length of the thirteenth lens 43 is f43; the third lens group 3 satisfies the following conditions: 0.081 < f4 / f41 < 0.122, -0.813 < f4 / f42 < -0.542, 1.279 < f4 / f43 < 1.919. Specifically, in this embodiment, the focal length of the fourth lens group 4 is 18.0, the focal length of the eleventh lens 41 is 184.4, the focal length of the twelfth lens 42 is -27.7, the focal length of the thirteenth lens 43 is 11.7, f4 / f41 = 0.10, f4 / f42 = -0.65, f4 / f43 = 1.54.

[0080] Please continue to refer to Figures 1 to 3 , the fifth lens group 5 includes a fourteenth lens 51, and the fourteenth lens 51 is a plastic aspherical lens.

[0081] With such settings, by reasonably distributing the lens optical power, adjusting the glass shape and material combination, chromatic aberration and secondary spectrum are effectively eliminated, and spherical aberration, coma, astigmatism, etc. on each lens are compensated and offset from each other to achieve a clear imaging effect and optimize the correction of higher-order aberrations and chromatic aberration.

[0082] It can be understood that the surface of the photosensitive chip 8 facing the object side is the imaging surface.

[0083] The optical component further includes an aperture 6, and the aperture 6 is located between the second lens group 2 and the third lens group 3; in this embodiment, the aperture 6 is an adjustable aperture 6, and the adjustable aperture 6 can perform corresponding aperture scaling measures according to the change of the ambient light intensity. With such settings, the overall length of the lens is effectively shortened, and at the same time, vignetting is reasonably used to achieve a large aperture and high resolution.

[0084] Among them, in the extending direction of the optical axis, the distance from the aperture 6 to the image side is L, and the overall optical length of the zoom lens 100 is TTL. In the zoom lens 100: 0.332 < L / TTL < 0.449; specifically, in this embodiment, the distance from the aperture 6 to the image side is 35.8 mm, and the overall optical length of the zoom lens 100 is 92.0 mm. In the zoom lens 100: L / TTL = 0.39.

[0085] Specifically, in this embodiment, the zoom lens 100 further includes a filter 7, and the filter 7 is located between the fifth lens group 5 and the imaging surface. The filter 7 is used to filter out unnecessary wavelength bands of light and stray light to reduce optical noise and make it easier for the subsequent optoelectronic module processing part. The filter 7 can also be used to adjust the color degree of the object image during final imaging, thereby improving the imaging quality.

[0086] Specifically, the imaging surface can be understood as the surface of the photosensitive chip 8 facing the filter 7. The light carrying the information of the photographed object can sequentially pass through the first lens group 1, the second lens group 2, the aperture 6, the third lens group 3, the fourth lens group 4, the fifth lens group 5, the filter 7 and finally form an image on the photosensitive chip 8 (the side of the filter 7 facing the fifth lens group 5).

[0087] Further, in one embodiment, the parameters of the zoom lens 100 are as follows: d = 6.7 mm, fw = 5.11 mm, ft = 130.9 mm, Fno w = 1.7, Fno T = 4.4, -4% ≤ α ≤ 4%, TTL = 91.8 mm. Among them, the effective imaging circle diameter is d, the focal length at the wide-angle end is fw, the focal length at the telephoto end is ft, and the aperture number at the wide-angle end is Fnow The aperture number at the telephoto end is Fno. T The optical distortion is α, and the total optical length of the zoom lens 100 is TTL.

[0088] Specifically, in this embodiment, the refractive index, radius of curvature, and thickness interval of the lens material are shown in the table below:

[0089] Table 1 Lens Parameters

[0090]

[0091]

[0092] Specifically, in this embodiment, the sixth lens 22, the seventh lens 23, the tenth lens 33, the eleventh lens 41, the twelfth lens 42, the thirteenth lens 43, and the fourteenth lens 51 are (plastic) aspherical lenses. The characteristic of aspherical lenses is that the curvature changes continuously from the center of the lens to the periphery. Unlike spherical lenses, which have a constant curvature from the center of the lens to the periphery, aspherical lenses have better curvature radius characteristics, which have the advantages of improving distortion aberration and astigmatism aberration. By using aspherical lenses, aberrations that occur during imaging can be eliminated as much as possible, thereby improving the image quality of the lens. Furthermore, using glass lenses can reduce the impact of temperature on the optical performance of the lens.

[0093] Furthermore, in this embodiment, the aspherical surface shape of the aspherical lens satisfies the following condition:

[0094]

[0095] Where c is the curvature corresponding to the radius, y is the radial coordinate (its unit is the same as the lens length unit), k is the conic quadratic coefficient (when the k coefficient is less than -1, the surface curve is a hyperbola; when the k coefficient is equal to -1, it is a parabola; when the k coefficient is between -1 and 0, it is an ellipse; when the k coefficient is equal to 0, it is a circle; and when the k coefficient is greater than 0, it is an oval), and A, B, C, D, E, F, and G are higher-order aspherical coefficients (please refer to Table 2 below). The shape and size of the aspherical surfaces of the object side and image side of the lens can be set by using the above parameters.

[0096] Table 2 Conicity and Asphericity Coefficients for Aspherical Lenses

[0097]

[0098] Table 3 shows the zoom magnification data of the zoom lens at the wide-angle, mid-magnification, and telephoto ends.

[0099] Wide angle Intermediate multiplier Looking into the distance T(7) 0.55 27.24 29.97 T(13) 30.43 3.74 1.02 T(20) 6.65 3.78 14.61 T(26) 8.66 11.53 0.70

[0100] In this embodiment, please refer to Figures 1 to 3 The diagram shows the structure of the zoom lens 100 when it is at the wide-angle end, the intermediate magnification, and the telephoto end; wherein, the intermediate magnification can be understood as the position diagram of each lens group in the zoom lens 100 when the zoom lens 100 is between the wide-angle end and the telephoto end.

[0101] Figures 4 to 6 The images show the spherical aberration diagram, field curvature diagram, and distortion diagram of the zoom lens 100 at its wide-angle end; please refer to... Figures 7 to 9 The images shown are the spherical aberration diagram, field curvature diagram, and distortion diagram of the zoom lens 100 at intermediate magnification; please refer to... Figures 10 to 12 The figures show the spherical aberration, field curvature, and distortion of the zoom lens 100 at the telephoto end. As can be seen from the figures, the zoom lens 100 in this embodiment achieves good correction of spherical aberration, field curvature, and distortion at intermediate magnification, wide-angle, and telephoto ends.

[0102] As can be seen from the above figures, the zoom lens 100 in this embodiment can achieve good correction of spherical aberration, field curvature, and distortion at the intermediate magnification, wide-angle end, and telephoto end.

[0103] In addition, the present invention also provides an imaging device, which includes the zoom lens 100 described in the above technical solution. Since the imaging device includes the zoom lens 100, the specific structure of the zoom lens 100 is as described in the above embodiments. Since the zoom lens 100 of the imaging device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0104] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A zoom lens, characterized in that, It includes a lens barrel and an optical component. The optical component is disposed in the lens barrel. The lens has an object side and an image side that are oppositely arranged in the direction of the optical axis extension. The optical component includes a first lens group, a second lens group, a third lens group, a fourth lens group, and a fifth lens group that are sequentially spaced from the object side to the image side. Among them: The first lens group has a positive optical power. The first lens group has four lenses and is fixedly installed in the lens barrel; The second lens group has a negative optical power. The second lens group has three lenses and is movably installed in the lens barrel along the optical axis direction; The third lens group has a positive optical power. The third lens group has three lenses and is fixedly installed on the lens barrel; The fourth lens group has a positive optical power. The fourth lens group has three lenses and is movably installed in the lens barrel along the optical axis direction; The fifth lens group is fixedly installed on the lens barrel; The optical component satisfies the following conditions: 0.097 < fw / f1 < 0.145, and -0.825 < fw / f2 < -0.55, and 0.163 < fw / f3 < 0.245, and 0.236 < fw / f4 < 0.354, and -0.1 < fw / f5 < 0.1; The focal length of the wide-angle end of the zoom lens is fw, the focal length of the first lens group is f1, the focal length of the second lens group is f2, the focal length of the third lens group is f3, the focal length of the fourth lens group is f4, and the focal length of the fifth lens group is f5; The four lenses of the first lens group include a first lens, a second lens, a third lens, and a fourth lens that are sequentially spaced from the object side to the image side; among them: The first lens has a negative optical power. The first lens is a glass spherical lens, and the focal length of the first lens is f11; The second lens has a positive optical power. The second lens is a glass spherical lens, and the focal length of the second lens is f12; The third lens has a positive optical power. The third lens is a glass spherical lens, and the focal length of the third lens is f13; The fourth lens has a positive optical power. The fourth lens is a glass spherical lens, and the focal length of the fourth lens is f14; The first lens group satisfies the following conditions: -0.738 < f1 / f11 < -0.492, 0.502 < f1 / f12 < 0.754, 0.472 < f1 / f13 < 0.708, 0.363 < f1 / f14 < 0.545; The effective clear aperture of the first lens is øL11, and the overall optical length of the zoom lens is TTL. Inside the zoom lens: 0.392 < øL11 / TTL < 0.479; The three lenses of the second lens group include a fifth lens, a sixth lens, and a seventh lens that are sequentially spaced from the object side to the image side; among them: The fifth lens has a negative optical power. The fifth lens is a glass spherical lens, and the focal length of the fifth lens is f21; The sixth lens has a negative optical power. The sixth lens is a plastic aspherical lens, and the focal length of the sixth lens is f22; The seventh lens has a positive optical power, the seventh lens is a plastic aspherical lens, and the focal length of the seventh lens is f23; The second lens group satisfies the following conditions: 0.681 < f2 / f21 < 1.021, 0.474 < f2 / f22 < 0.711, and -0.528 < f2 / f23 < -0.

352.

2. The zoom lens according to claim 1, wherein The fifth lens has a relative displacement amount ΔZ when the zoom lens is at the wide-angle end position and when the zoom lens is at the telephoto end position W-T , and an optical total length TTL of the zoom lens, and within the zoom lens: 0.279 < ΔZ W-T / TTL < 0.

362.

3. The zoom lens as described in claim 1, characterized in that, The three lenses of the third lens group include an eighth lens, a ninth lens, and a tenth lens that are sequentially spaced from the object side to the image side; where: The eighth lens has a positive optical power, the eighth lens is a glass spherical lens, and the focal length of the eighth lens is f31; The ninth lens has a positive optical power, the ninth lens is a glass spherical lens, and the focal length of the ninth lens is f32; The tenth lens has a negative optical power, the tenth lens is a plastic aspherical lens, and the focal length of the tenth lens is f33; The third lens group satisfies the following conditions: 0.698 < f3 / f31 < 1.047, 0.475 < f3 / f32 < 0.712, -0.804 < f3 / f33 < -0.

536.

4. The zoom lens as described in claim 1, characterized in that, The three lenses of the fourth lens group include an eleventh lens, a twelfth lens, and a thirteenth lens that are sequentially spaced from the object side to the image side; where: The eleventh lens has a positive optical power, the eleventh lens is a plastic aspherical lens, and the focal length of the eleventh lens is f41; The twelfth lens has a negative optical power, the twelfth lens is a plastic aspherical lens, and the focal length of the twelfth lens is f42; The thirteenth lens has a positive optical power, the thirteenth lens is a plastic aspherical lens, and the focal length of the thirteenth lens is f43; The fourth lens group satisfies the following conditions: 0.081 < f4 / f41 < 0.122, -0.813 < f4 / f42 < -0.542, 1.279 < f4 / f43 < 1.

919.

5. The zoom lens as described in claim 1, characterized in that, The fifth lens group includes a fourteenth lens, and the fourteenth lens is a plastic aspherical lens.

6. The zoom lens as described in claim 1, characterized in that, The optical assembly further includes an aperture, and the aperture is located between the second lens group and the third lens group; Wherein, in the extending direction of the optical axis, the distance from the aperture to the imaging surface of the zoom lens is L, the overall optical length of the zoom lens is TTL, and within the zoom lens: 0.332 < L / TTL < 0.

449.

7. An imaging device, characterized in that, Comprising the zoom lens according to any one of claims 1 to 6.

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