Zoom lens and surveillance camera device

Abstract

The present invention discloses a zoom lens and a surveillance camera device. The zoom lens includes a plurality of lens groups arranged in sequence from the object side to the image side, and an optical axis is correspondingly formed between the plurality of lens groups. Among them, the plurality of lens groups include a first lens group, a second lens group, a third lens group, a fourth lens group, and a fifth lens group, and at least one of the first lens group, the second lens group, the third lens group, and the fifth lens group is movably arranged along the extending direction of the optical axis. By the material, refractive index, Abbe number, curvature, and core thickness of each lens, the zoom lens can achieve 0.06 < fw / f1 < 0.35, -2.45 < fw / f2 < -0.21, 0.36 < fw / f3 < 1.28, -1.65 < fw / f4 < -0.36, 0.32 < fw / f5 < 1.52, so that when the overall optical length of the zoom lens is controlled to be less than 140 mm, the magnification of the zoom lens can be 16x, so as to solve the technical problems of the existing zoom lens having a small aperture, a small field of view angle, and the inability to coexist large magnification and small volume.

Description

Technical Field

[0001] The present invention relates to the field of optical technologies, and particularly to a zoom lens and a surveillance camera device. Background Art

[0002] Currently, security video surveillance lenses are still mainly fixed-focus lenses. With the deepening application of 5G, cloud computing, and big data, the application scope of security lens products has been continuously broadened, and the market demand for zoom lenses has also increased year by year. However, since the imaging quality of zoom lenses is usually lower than that of fixed-focus lenses, the resolution of the captured images is relatively low, the shooting effect is average, and the market penetration rate is not high. At the same time, the aperture of zoom lenses is usually smaller than that of fixed-focus lenses, resulting in less light entering the lens. In low-light environments, the shooting effect is difficult to meet the usage requirements, which restricts the popularization of zoom lenses. With the advancement of security towards high definition and miniaturization, it is necessary for optical lenses to achieve ultra-wide angle, high resolution, large aperture while being miniaturized and lightweight. Summary of the Invention

[0003] The main object of the present invention is to propose a zoom lens and a surveillance camera device, aiming to solve the technical problems of the existing zoom lenses having a small aperture, a small field of view, and the inability to coexist large zoom ratio and small volume.

[0004] To achieve the above object, a zoom lens proposed by the present invention includes a plurality of lens groups arranged in sequence from the object side to the image side. An optical axis is correspondingly formed between the plurality of lens groups. Among them, the plurality of lens groups include a first lens group with a positive optical power, a second lens group with a negative optical power, a third lens group with a positive optical power, a fourth lens group with a negative optical power, and a fifth lens group with a positive optical power. At least one of the first lens group, the second lens group, the third lens group, and the fifth lens group is movably arranged along the extending direction of the optical axis to adjust the focal length of the zoom lens, and the fourth lens group is movably arranged along the extending direction of the optical axis to focus the zoom lens.

[0005] Among them, 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. Among them, 0.06 < fw / f1 < 0.35, and -2.45 < fw / f2 < -0.21, and 0.36 < fw / f3 < 1.28, and -1.65 < fw / f4 < -0.36, and 0.32 < fw / f5 < 1.52.

[0006] Optionally, the first lens group includes a first lens, a second lens, and a third lens arranged in sequence from the object side to the image side;

[0007] The second lens group includes a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in sequence from the object side to the image side;

[0008] The third lens group includes an eighth lens, a ninth lens, and a tenth lens arranged in sequence from the object side to the image side;

[0009] The fourth lens group includes an eleventh lens;

[0010] The fifth lens group includes a twelfth lens, a thirteenth lens, a fourteenth lens, a fifteenth lens, a sixteenth lens, and a seventeenth lens arranged in sequence from the object side to the image side;

[0011] Wherein, the optical power of the first lens is negative;

[0012] The optical power of the second lens is positive;

[0013] The optical power of the third lens is positive;

[0014] The optical power of the fourth lens is positive;

[0015] The optical power of the fifth lens is negative;

[0016] The optical power of the sixth lens is positive;

[0017] The optical power of the seventh lens is negative;

[0018] The optical power of the eighth lens is positive;

[0019] The optical power of the ninth lens is negative;

[0020] The optical power of the tenth lens is positive;

[0021] The optical power of the eleventh lens is negative;

[0022] The optical power of the twelfth lens is negative;

[0023] The optical power of the thirteenth lens is positive;

[0024] The optical power of the fourteenth lens is positive;

[0025] The optical power of the fifteenth lens is positive;

[0026] The optical power of the sixteenth lens is positive;

[0027] The optical power of the seventeenth lens is negative.

[0028] Optionally, the focal length of the first lens is f11, the focal length of the second lens is f12, the focal length of the third lens is f13, the focal length of the fourth lens is f21, the focal length of the fifth lens is f22, the focal length of the sixth lens is f23, the focal length of the seventh lens is f24, the focal length of the eighth lens is f31, the focal length of the ninth lens is f32, the focal length of the tenth lens is f33, the focal length of the eleventh lens is f41, the focal length of the twelfth lens is f51, the focal length of the thirteenth lens is f52, the focal length of the fourteenth lens is f53, the focal length of the fifteenth lens is f54, the focal length of the sixteenth lens is f55, the focal length of the seventeenth lens is f56, where,

[0029] -0.96 < f1 / f11 < -0.05;

[0030] 0.62 < f1 / f12 < 1.65;

[0031] 0.65 < f1 / f13 < 1.26;

[0032] -0.35 < f2 / f21 < -0.05;

[0033] 0.09 < f2 / f22 < 1.01;

[0034] -1.58 < f2 / f23 < -0.16;

[0035] 0.45 < f2 / f24 < 1.86;

[0036] 0.23 < f3 / f31 < 1.12;

[0037] -0.56 < f3 / f32 < -0.11;

[0038] 0.32 < f3 / f33 < 0.98;

[0039] f4 / f41 = 1;

[0040] -3.2 < f5 / f51 < -0.52;

[0041] 0.32 < f5 / f52 < 1.08;

[0042] 0.17 < f5 / f53 < 0.66;

[0043] 0.21 < f5 / f54 < 0.87;

[0044] 0.76 < f5 / f55 < 2.32;

[0045] -0.82 < f5 / f56 < -0.22.

[0046] Optionally, the first lens is a meniscus lens, with one side facing the object side being convex and the side facing the image side being concave;

[0047] The second lens is a biconvex lens;

[0048] The third lens is a meniscus lens, with one side facing the object side being convex and the side facing the image side being concave;

[0049] The fourth lens is a biconvex lens;

[0050] The fifth lens is a meniscus lens, with one side facing the object side being convex and the side facing the image side being concave;

[0051] The sixth lens is a biconvex lens;

[0052] The seventh lens is a biconcave lens;

[0053] The eighth lens is a biconvex lens;

[0054] The ninth lens is a meniscus lens, with one side facing the object side being convex and the side facing the image side being concave;

[0055] The tenth lens is a biconvex lens;

[0056] The eleventh lens is a meniscus lens, with one side facing the object side being convex and the side facing the image side being concave;

[0057] The twelfth lens is a biconcave lens;

[0058] The thirteenth lens is a biconvex lens;

[0059] The fourteenth lens is a meniscus lens, with one side facing the object side being concave and the side facing the image side being convex;

[0060] The fifteenth lens is a biconvex lens;

[0061] The sixteenth lens is a biconvex lens;

[0062] The seventeenth lens is a meniscus lens, with one side facing the object side being concave and the side facing the image side being convex.

[0063] Optionally, at least one of the fifth lens and the seventh lens is an aspherical lens; and / or,

[0064] The eighth lens is an aspherical lens.

[0065] Optionally, the first lens and the second lens are adhesively connected; and / or,

[0066] the ninth lens and the tenth lens are adhesively connected; and / or,

[0067] the sixteenth lens and the seventeenth lens are adhesively connected.

[0068] Optionally, the zoom lens further includes an aperture stop, the aperture stop is disposed between the third lens group and the fourth lens group, or between any two adjacent lenses of the eighth lens, the ninth lens and the tenth lens, the aperture stop is movably disposed along the extending direction of the optical axis, and the aperture stop is connected to the third lens group to move synchronously with the third lens group.

[0069] Optionally, the distance between the aperture stop and the imaging surface of the zoom lens on the optical axis is L, and the overall optical length of the zoom lens is TTL, where 0.25 < L / TTL < 0.68.

[0070] Optionally, the zoom lens further includes a filter, a protective glass and a photosensitive chip along the optical axis from the object side to the image side, and the filter, the protective glass and the photosensitive chip are disposed on a side of the fifth lens group close to the image side.

[0071] The present invention also provides a monitoring and imaging device, the monitoring and imaging device includes an optical lens system, the optical lens system includes a plurality of lens groups arranged in sequence from the object side to the image side, and a light axis is correspondingly formed between the plurality of lens groups. Among them, the plurality of lens groups include a first lens group with a positive optical power, a second lens group with a negative optical power, a third lens group with a positive optical power, a fourth lens group with a negative optical power, and a fifth lens group with a positive optical power. At least one of the first lens group, the second lens group, the third lens group and the fifth lens group is movably disposed along the extending direction of the optical axis to adjust the focal length of the zoom lens, and the fourth lens group is movably disposed along the extending direction of the optical axis to focus the zoom lens;

[0072] Wherein, 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. Among them, 0.06 < fw / f1 < 0.35, and -2.45 < fw / f2 < -0.21, and 0.36 < fw / f3 < 1.28, and -1.65 < fw / f4 < -0.36, and 0.32 < fw / f5 < 1.52.

[0073] In the technical solution provided by the present invention, through the materials, refractive indices, Abbe numbers, curvatures, and core thicknesses of the lenses in the first lens group, the second lens group, the third lens group, the fourth lens group, and the fifth lens group, the zoom lens can achieve 0.06 < fw / f1 < 0.35, and -2.45 < fw / f2 < -0.21, and 0.36 < fw / f3 < 1.28, and -1.65 < fw / f4 < -0.36, and 0.32 < fw / f5 < 1.52, so that when the overall optical length of the zoom lens is controlled to be less than 140 mm, the magnification of the zoom lens can reach 16x, so as to solve the technical problems of the existing zoom lens having a small aperture, a small field of view, and the inability to coexist large zoom ratio and small volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0074] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0075] Figure 1 It is a schematic structural diagram of the wide-angle end of an embodiment of the zoom lens provided by the present invention;

[0076] Figure 2 is Figure 1 a schematic structural diagram of the middle position of the zoom lens;

[0077] Figure 3 is Figure 1 a schematic structural diagram of the telephoto end of the zoom lens;

[0078] Figure 4 is Figure 1 a MTF curve diagram of the wide-angle end of the zoom lens;

[0079] Figure 5 is Figure 1 a MTF curve diagram of the middle position of the zoom lens;

[0080] Figure 6 is Figure 1 a MTF curve diagram of the telephoto end of the zoom lens.

[0081] Explanation of the reference numerals in the drawings:

[0082] Reference Numeral Name Reference Numeral Name 1000 Zoom Lens 10 Tenth Lens 100 First Lens Group 400 Fourth Lens Group 1 First Lens 11 Eleventh Lens 2 Second Lens 500 Fifth Lens Group 3 Third Lens 12 Twelfth Lens 200 Second Lens Group 13 Thirteenth Lens 4 Fourth Lens 14 Fourteenth Lens 5 Fifth Lens 15 Fifteenth Lens 6 Sixth Lens 16 Sixteenth Lens 7 Seventh Lens 17 Seventeenth Lens 300 Third Lens Group 30 Aperture Stop 8 Eighth Lens 40 Image Sensor Chip 9 Ninth Lens 50 Filter

[0083] The realization, functional features, and advantages of the objectives of the present invention will be further described with reference to the embodiments and the drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0084] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0085] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0086] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0087] Currently, security video surveillance lenses are still mainly fixed-focus lenses. With the deepening application of 5G, cloud computing, and big data, the application scope of security lens products has been continuously broadened, and the market demand for zoom lenses has also increased year by year. However, since the imaging quality of zoom lenses is usually lower than that of fixed-focus lenses, the resolution of the captured images is relatively low, the shooting effect is average, and the market penetration rate is not high. At the same time, the aperture of zoom lenses is usually smaller than that of fixed-focus lenses, resulting in less light entering the lens. In low-light environments, the shooting effect is difficult to meet the usage requirements, which restricts the popularization of zoom lenses. With the advancement of security towards high definition and miniaturization, it is necessary for optical lenses to achieve ultra-wide angle, high resolution, large aperture, while also being miniaturized and lightweight.

[0088] To solve the above problems, the present invention provides a zoom lens 1000. Figure 1 This is a specific embodiment of the zoom lens 1000 provided by the present invention.

[0089] Please refer to Figure 1, the zoom lens 1000 includes a plurality of lens groups arranged in sequence from the object side to the image side, and an optical axis is correspondingly formed between the plurality of lens groups. Among them, the plurality of lens groups include a first lens group 100 with a positive optical power, a second lens group 200 with a negative optical power, a third lens group 300 with a positive optical power, a fourth lens group 400 with a negative optical power, and a fifth lens group 500 with a positive optical power. At least one of the second lens group 200, the third lens group 300, and the fifth lens group 500 is movably arranged along the extending direction of the optical axis to adjust the focal length of the zoom lens 1000, and the fourth lens group 400 is movably arranged along the extending direction of the optical axis to focus the zoom lens 1000. Among them, the focal length of the zoom lens 1000 at the wide-angle end is fw, the focal length of the first lens group 100 is f1, the focal length of the second lens group 200 is f2, the focal length of the third lens group 300 is f3, the focal length of the fourth lens group 400 is f4, and the focal length of the fifth lens group 500 is f5. Among them, 0.06 < fw / f1 < 0.35, and -2.45 < fw / f2 < -0.21, and 0.36 < fw / f3 < 1.28, and -1.65 < fw / f4 < -0.36, and 0.32 < fw / f5 < 1.52.

[0090] In the technical solution provided by the present invention, through the material, refractive index, Abbe number, curvature, and core thickness of each lens in the first lens group 100, the second lens group 200, the third lens group 300, the fourth lens group 400, and the fifth lens group 500, the zoom lens 1000 can achieve 0.06 < fw / f1 < 0.35, and -2.45 < fw / f2 < -0.21, and 0.36 < fw / f3 < 1.28, and -1.65 < fw / f4 < -0.36, and 0.32 < fw / f5 < 1.52, so that when the overall optical length of the zoom lens 1000 is controlled to be less than 140 mm, the magnification of the zoom lens 1000 can be 16x, so as to solve the technical problems of the existing zoom lens 1000 having a small aperture, a small field of view, and the inability to coexist large zoom ratio and small volume.

[0091] Specifically, in order to enable the zoom lens 1000 to achieve the maximum magnification while achieving the minimum aperture, field of view, and volume, in the optimal embodiment, fw / f1 = 2 / 19, fw / f2 = -(22 / 23), fw / f3 = 10 / 17, fw / f4 = -(6 / 15), fw / f5 = 3 / 5. In this way, the imaging quality of the zoom lens 1000 reaches the best state.

[0092] Specifically, during the optical design process, the lens groups are grouped according to the functions they perform and the tasks they complete. In this embodiment, the first lens group 100 includes a first lens 1, a second lens 2, and a third lens 3 arranged in sequence from the object side to the image side; the second lens group 200 includes a fourth lens 4, a fifth lens 5, a sixth lens 6, and a seventh lens 7 arranged in sequence from the object side to the image side; the third lens group 300 includes an eighth lens 8, a ninth lens 9, and a tenth lens 10 arranged in sequence from the object side to the image side; the fourth lens group 400 includes an eleventh lens 11; the fifth lens group 500 includes a twelfth lens 12, a thirteenth lens 13, a fourteenth lens 14, a fifteenth lens 15, a sixteenth lens 16, and a seventeenth lens 17 arranged in sequence from the object side to the image side. Among them, the optical power of the first lens 1 is negative, the optical power of the second lens 2 is positive, and the optical power of the third lens 3 is positive, so that the optical power of the first lens group 100 is positive.

[0093] The optical power of the fourth lens 4 is positive, the optical power of the fifth lens 5 is negative, the optical power of the sixth lens 6 is positive, and the optical power of the seventh lens 7 is negative, so that the optical power of the second lens group 200 is negative.

[0094] The optical power of the eighth lens 8 is positive, the optical power of the ninth lens 9 is negative, and the optical power of the tenth lens 10 is positive, so that the optical power of the third lens group 300 is positive.

[0095] The optical power of the eleventh lens 11 is negative, so that the optical power of the fourth lens group 400 is negative.

[0096] The optical power of the twelfth lens 12 is negative, the optical power of the thirteenth lens 13 is positive, the optical power of the fourteenth lens 14 is positive, the optical power of the fifteenth lens 15 is positive, the optical power of the sixteenth lens 16 is positive, and the optical power of the seventeenth lens 17 is negative, so that the optical power of the fifth lens group 500 is positive.

[0097] With such an arrangement, by reasonably distributing the optical power of the lenses, 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 realize the optimal correction of higher-order aberrations and chromatic aberration.

[0098] Further, the focal length of the first lens 1 is f11, the focal length of the second lens 2 is f12, the focal length of the third lens 3 is f13, the focal length of the fourth lens 4 is f21, the focal length of the fifth lens 5 is f22, the focal length of the sixth lens 6 is f23, the focal length of the seventh lens 7 is f24, the focal length of the eighth lens 8 is f31, the focal length of the ninth lens 9 is f32, the focal length of the tenth lens 10 is f33, the focal length of the eleventh lens 11 is f41, the focal length of the twelfth lens 12 is f51, the focal length of the thirteenth lens 13 is f52, the focal length of the fourteenth lens 14 is f53, the focal length of the fifteenth lens 15 is f54, the focal length of the sixteenth lens 16 is f55, the focal length of the seventeenth lens 17 is f56, where, -0.96 < f1 / f11 < -0.05; 0.62 < f1 / f12 < 1.65; 0.65 < f1 / f13 < 1.26; -0.35 < f2 / f21 < -0.05; 0.09 < f2 / f22 < 1.01; -1.58 < f2 / f23 < -0.16; 0.45 < f2 / f24 < 1.86; 0.23 < f3 / f31 < 1.12; -0.56 < f3 / f32 < -0.11; 0.32 < f3 / f33 < 0.98; f4 / f41 = 1; -3.2 < f5 / f51 < -0.52; 0.32 < f5 / f52 < 1.08; 0.17 < f5 / f53 < 0.66; 0.21 < f5 / f54 < 0.87; 0.76 < f5 / f55 < 2.32; -0.82 < f5 / f56 < -0.22.

[0099] Preferably, f1 / f11 = -(8 / 17), f1 / f12 = 3 / 4, f1 / f13 = 7 / 5, and the optical power of the first lens 1 is -130.71, the optical power of the second lens 2 is 78.93, and the optical power of the third lens 3 is 83.90.

[0100] f2 / f21 = -(4 / 45), f2 / f22 = 7 / 23, f2 / f23 = -(2 / 5), f2 / f24 = 4 / 3, and the optical power of the fourth lens 4 is 152.80, the optical power of the fifth lens 5 is -57.89, the optical power of the sixth lens 6 is 32.59, the optical power of the seventh lens 7 is -10.22, f3 / f31 = 2 / 3, f3 / f32 = -(1 / 3), f3 / f33 = 5 / 7, and the optical power of the eighth lens 8 is 33.19, the optical power of the ninth lens 9 is -68.94, and the optical power of the tenth lens 10 is 31.34.

[0101] f4 / f41 = 1, and the optical power of the eleventh lens 11 is -31.96.

[0102] f5 / f51 = -(19 / 23), f5 / f52 = 27 / 38, f5 / f53 = 7 / 25, f5 / f54 = 3 / 7, f5 / f55 = 22 / 23, f5 / f56 = -(1 / 2), and the optical power of the twelfth lens 12 is -18.47, the optical power of the thirteenth lens 13 is 31.72, the optical power of the fourteenth lens 14 is 69.74, the optical power of the fifteenth lens 15 is 51.75, the optical power of the sixteenth lens 16 is 23.38, and the optical power of the seventeenth lens 17 is -44.98. In this way, the imaging quality of the zoom lens 1000 reaches the best state.

[0103] Furthermore, in this embodiment, at least one of the fifth lens 5 and the seventh lens 7 is an aspherical lens; and / or, the eighth lens 8 is an aspherical lens. The surface shapes of the fifth lens 5, the seventh lens 7, and the eighth lens 8 satisfy the following formula:

[0104]

[0105] where c corresponds to the reciprocal of the radius R, y is the radial coordinate, k is the conic quadratic coefficient, and a1 to a8 are the coefficients corresponding to the respective radial coordinates.

[0106] It should be noted that the basic parameter table of the zoom lens 1000 in this embodiment is shown in Table 1, where the unit of the radius of curvature and the thickness is millimeter (mm).

[0107] Table 1

[0108]

[0109]

[0110] It should be noted that the even-term coefficients of the aspherical surfaces of the zoom lens 1000 in this embodiment are shown in Table 2, where the unit of the radius of curvature is millimeter (mm).

[0111] Table 2

[0112]

[0113] It should be noted that the even-term coefficients of the aspherical lenses of the zoom lens 1000 in this embodiment are shown in Table 3:

[0114] Table 3

[0115] Wide Angle Medium Telephoto Focal Length 13 100 208 F-number 1.1 2.2 4.5 Half Field of View Angle 20.72 2.72 1.25 Image Height 4.75 4.75 4.75 Overall Length of the Lens 140 140 140 D5 0.35 21.87 21.64 D13 42.77 9.17 2.69 D20 0.36 8.06 17.16 D22 7.20 15.12 23.28 D34 14.8 11.26 0.7

[0116] Specifically, the convex-concave lens (meniscus lens) is a lens with two radii of curvature, where the radius of curvature of the front surface is greater than that of the rear surface. It can focus small spots or be used for collimation applications and can reduce spherical aberration. The biconvex aspherical lens can re-converge the optical paths that are dispersed from the focal point back to the focal point as much as possible. The biconcave spherical lens can reduce imaging and diverge light beams. In this embodiment, the first lens 1 is a convex-concave lens. The side of the first lens 1 facing the object side is a convex surface, and the side facing the image side is a concave surface. Therefore, the first lens 1 can diverge the external light and can effectively reduce spherical aberration. The second lens 2 is a biconvex lens, and the second lens 2 converges the transmitted light. After the first lens 1 and the second lens 2 are adhesively connected, they have a large aperture and can collect more optical information under the same focal length, achieving the effect of clear imaging in low light. The third lens 3 is a convex-concave lens. The side of the third lens 3 facing the object side is a convex surface, and the side facing the image side is a concave surface. The third lens 3 converges the transmitted light again to adjust the spherical aberration. The first lens group 100 finally converges the light well and transmits it to the second lens group 200.

[0117] The fourth lens 4 is a biconvex lens, the fifth lens 5 is a convex-concave lens. The side of the fifth lens 5 facing the object side is a convex surface, and the side facing the image side is a concave surface. The fifth lens 5 converges the light to adjust the spherical aberration. The sixth lens 6 is a biconvex lens, and the seventh lens 7 is a biconcave lens. After the fourth lens 4, the fifth lens 5, the sixth lens 6, and the seventh lens 7 converge, diverge, and then converge the light, finally, through the sixth lens 6, it cancels the spherical aberration, coma, astigmatism, and distortion generated by the first three lenses in the second lens group 200. At the same time, it can reduce the deflection angle of the light, make the light of the system smoother, and reduce the sensitivity of the lens alignment tolerance.

[0118] The eighth lens 8 is a biconvex lens, the ninth lens 9 is a convex-concave lens. The side of the ninth lens 9 facing the object side is a convex surface, and the side facing the image side is a concave surface. The tenth lens 10 is a biconvex lens. The eighth lens 8, the ninth lens 9, and the tenth lens 10 can effectively improve field curvature, chromatic aberration, higher-order aberration, spherical aberration, and coma.

[0119] The eleventh lens 11 is a convex-concave lens. The side of the eleventh lens 11 facing the object side is a convex surface, and the side facing the image side is a concave surface. The eleventh lens 11 is used to cancel the astigmatism and distortion generated by the previous lenses and control the angle of the chief ray of the light emerging from the lens.

[0120] The twelfth lens 12 is a biconcave lens; the thirteenth lens 13 is a biconvex lens; the fourteenth lens 14 is a concave-convex lens, and the side of the fourteenth lens 14 facing the object side is concave, and the side facing the image side is convex; the fifteenth lens 15 is a biconvex lens; the sixteenth lens 16 is a biconvex lens; the seventeenth lens 17 is a concave-convex lens, and the side of the seventeenth lens 17 facing the object side is concave, and the side facing the image side is convex.

[0121] Further, in this embodiment, at least one of the fifth lens 5 and the seventh lens 7 is an aspherical lens; and / or, the eighth lens 8 is an aspherical lens. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After using an aspherical lens, it is possible to eliminate the aberration that appears during imaging as much as possible, thereby improving the imaging quality of the lens.

[0122] Further, in order to enable optical components to improve the image quality of the optical system, reduce light energy loss, increase imaging clarity, protect the scale surface, further optimize the processing process to meet the design requirements, reasonably use cemented components, appropriately distribute the optical power, combine the thermal parameters of the glass material, well correct the aberration and achieve the effect of athermalization at high and low temperatures, and also effectively reduce chromatic aberration to achieve the effect of a common focal plane and clear imaging in the visible light band and the near-infrared band, and meet the requirements of day and night use, the first lens 1 and the second lens 2 are cemented together, and 0.1 < f1 / f101 < 0.59; where f1 is the focal length of the first lens group 100, and f101 is the focal length of the first cemented lens formed by cementing the first lens 1 and the second lens 2. Preferably, f1 / f101 = 3 / 10; and / or, the ninth lens 9 and the tenth lens 10 are cemented together, and 0.12 < f3 / f301 < 0.65; where f3 is the focal length of the third lens group 300, and f301 is the focal length of the second cemented lens formed by cementing the ninth lens 9 and the tenth lens 10. Preferably, f3 / f301 = 3 / 8; and / or, the sixteenth lens 16 and the seventeenth lens 17 are cemented together, and 0.12 < f5 / f501 < 0.65; where f5 is the focal length of the third lens group 300, and f501 is the focal length of the third cemented lens formed by cementing the sixteenth lens 16 and the seventeenth lens 17. Preferably, f5 / f501 = 26 / 53. It can effectively correct chromatic aberration in the visible light band and the infrared band, which is beneficial to achieving a common focal plane of the optical system in the visible light band and the infrared light band.

[0123] Further, in order to improve the imaging quality, in this embodiment, the zoom lens 1000 further includes an aperture stop 30, which is disposed between the third lens group 300 and the fourth lens group 400, or between any two adjacent lenses among the eighth lens 8, the ninth lens 9, and the tenth lens 10. The aperture stop 30 is movably disposed along the extending direction of the optical axis. The aperture stop 30 is connected to the third lens group 300 to move synchronously with the third lens group 300. The function of the aperture stop 30 is to limit the light-passing aperture of the light beam and block part of the light during the zooming process, reducing aberration, improving the image contrast, and helping to enhance the image quality.

[0124] Specifically, the distance between the aperture stop 30 and the imaging surface of the zoom lens 1000 on the optical axis is L, and the total optical length of the zoom lens 1000 is TTL, where 0.25 < L / TTL < 0.68.

[0125] Further, in this embodiment, the zoom lens 1000 further includes a filter 50, a protective glass, and a photosensitive chip 40 along the optical axis from the object side to the image side. The filter 50, the protective glass, and the photosensitive chip 40 are disposed on the side of the fifth lens group 500 close to the image side. The filter 50 can effectively filter out stray light in non-working bands to reduce optical noise and make it easier for the subsequent optoelectronic module processing part. The filter 50 can also be used to adjust the color degree of the object image during the final imaging. The protective glass has high light transmittance and high hardness, providing good protection for the zoom lens 1000 and preventing the internal components (such as chips) of the zoom lens 1000 from being damaged.

[0126] The present invention also provides a monitoring and imaging device, which includes the above-mentioned zoom lens 1000. Since the monitoring and imaging device includes the zoom lens 1000, the specific structure of this zoom lens 1000 refers to the above embodiment. Since the zoom lens 1000 of this monitoring and imaging device adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0127] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied to other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A zoom lens, characterized in that, Comprising a plurality of lens groups arranged in sequence from the object side to the image side, a optical axis is correspondingly formed between the plurality of lens groups. Among them, the plurality of lens groups include a first lens group with a positive focal power, a second lens group with a negative focal power, a third lens group with a positive focal power, a fourth lens group with a negative focal power, and a fifth lens group with a positive focal power. At least one of the first lens group, the second lens group, the third lens group, and the fifth lens group is movably arranged along the extending direction of the optical axis to adjust the focal length of the zoom lens. The fourth lens group is movably arranged along the extending direction of the optical axis to focus the zoom lens. The zoom lens further includes a filter, a protective glass, and a photosensitive chip along the optical axis from the object side to the image side. The filter, the protective glass, and the photosensitive chip are arranged on one side of the fifth lens group close to the image side; Among them, 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. Among them, 0.06 < fw / f1 < 0.35, -2.45 < fw / f2 < -0.21, 0.36 < fw / f3 < 1.28, -1.65 < fw / f4 < -0.36, 0.32 < fw / f5 < 1.52; The first lens group includes a first lens, a second lens, and a third lens arranged in sequence from the object side to the image side; The second lens group includes a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in sequence from the object side to the image side; The third lens group includes an eighth lens, a ninth lens, and a tenth lens arranged in sequence from the object side to the image side; The fourth lens group includes an eleventh lens; The fifth lens group includes a twelfth lens, a thirteenth lens, a fourteenth lens, a fifteenth lens, a sixteenth lens, and a seventeenth lens arranged in sequence from the object side to the image side; Among them, the focal power of the first lens is negative; The focal power of the second lens is positive; The focal power of the third lens is positive; The focal power of the fourth lens is positive; The focal power of the fifth lens is negative; The focal power of the sixth lens is positive; The focal power of the seventh lens is negative; The focal power of the eighth lens is positive; The focal power of the ninth lens is negative; The focal power of the tenth lens is positive; The focal power of the eleventh lens is negative; The focal power of the twelfth lens is negative; The focal power of the thirteenth lens is positive; The focal power of the fourteenth lens is positive; The focal power of the fifteenth lens is positive; The focal power of the sixteenth lens is positive; The focal power of the seventeenth lens is negative.

2. The zoom lens according to claim 1, characterized in that, The focal length of the first lens is f11, the focal length of the second lens is f12, the focal length of the third lens is f13, the focal length of the fourth lens is f21, the focal length of the fifth lens is f22, the focal length of the sixth lens is f23, the focal length of the seventh lens is f24, the focal length of the eighth lens is f31, the focal length of the ninth lens is f32, the focal length of the tenth lens is f33, the focal length of the eleventh lens is f41, the focal length of the twelfth lens is f51, the focal length of the thirteenth lens is f52, the focal length of the fourteenth lens is f53, the focal length of the fifteenth lens is f54, the focal length of the sixteenth lens is f55, the focal length of the seventeenth lens is f56, where, -0.96 < f1 / f11 < -0.05; 0.62 < f1 / f12 < 1.65; 0.65 < f1 / f13 < 1.26; -0.35 < f2 / f21 < -0.05; 0.09 < f2 / f22 < 1.01; -1.58 < f2 / f23 < -0.16; 0.45 < f2 / f24 < 1.86; 0.23 < f3 / f31 < 1.12; -0.56 < f3 / f32 < -0.11; 0.32 < f3 / f33 < 0.98; f4 / f41 = 1; -3.2 < f5 / f51 < -0.52; 0.32 < f5 / f52 < 1.08; 0.17 < f5 / f53 < 0.66; 0.21 < f5 / f54 < 0.87; 0.76 < f5 / f55 < 2.32; -0.82 < f5 / f56 < -0.

22.

3. The zoom lens according to claim 1, characterized in that, The first lens is a meniscus lens, the side of the first lens facing the object side is a convex surface, and the side facing the image side is a concave surface; The second lens is a biconvex lens; The third lens is a meniscus lens, the side of the third lens facing the object side is a convex surface, and the side facing the image side is a concave surface; The fourth lens is a biconvex lens; The fifth lens is a meniscus lens, the side of the fifth lens facing the object side is a convex surface, and the side facing the image side is a concave surface; The sixth lens is a biconvex lens; The seventh lens is a biconcave lens; The eighth lens is a biconvex lens; The ninth lens is a meniscus lens, the side of the ninth lens facing the object side is a convex surface, and the side facing the image side is a concave surface; The tenth lens is a biconvex lens; The eleventh lens is a meniscus lens, the side of the eleventh lens facing the object side is a convex surface, and the side facing the image side is a concave surface; The twelfth lens is a biconcave lens; The thirteenth lens is a biconvex lens; The fourteenth lens is an aspherical lens with a concave surface on the object side and a convex surface on the image side; The fifteenth lens is a biconvex lens; The sixteenth lens is a biconvex lens; The seventeenth lens is an aspherical lens with a concave surface on the object side and a convex surface on the image side.

4. The zoom lens according to claim 1, characterized in that, At least one of the fifth lens and the seventh lens is an aspherical lens; and / or, The eighth lens is an aspherical lens.

5. The zoom lens according to claim 1, characterized in that, The first lens and the second lens are adhesively connected; and / or, The ninth lens and the tenth lens are adhesively connected; and / or, The sixteenth lens and the seventeenth lens are adhesively connected.

6. The zoom lens according to claim 1, characterized in that, The zoom lens further includes an aperture stop, which is disposed between the third lens group and the fourth lens group, or between any two adjacent lenses of the eighth lens, the ninth lens and the tenth lens. The aperture stop is movably disposed along the extension direction of the optical axis, and the aperture stop is connected to the third lens group to move synchronously with the third lens group.

7. The zoom lens according to claim 6, characterized in that, The distance between the aperture stop and the imaging plane of the zoom lens on the optical axis is L, and the overall optical length of the zoom lens is TTL, where 0.25 < L / TTL < 0.

68.

8. A surveillance camera device, characterized in that, A zoom lens includes any one of claims 1 to 7.

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