A zoom lens and an imaging device

Abstract

The present invention discloses a zoom lens and a camera device. The zoom lens includes a lens body, which comprises a lens barrel, a variable magnification lens group, a compensating lens group and a driving device. The lens barrel is arranged in the front-rear direction and forms a cavity. The variable magnification lens group is movably arranged in the cavity in the front-rear direction and includes a first lens group, a second lens group and a third lens group. The compensating lens group is movably arranged in the cavity in the front-rear direction. The compensating lens group includes a fourth lens group, and the fourth lens group is arranged at the rear side of the third lens group and is spaced from the third lens group. The driving device is drivingly connected to the variable magnification lens group and the compensating lens group. The F-number of the zoom lens is Fno, where 1.0 ≤ Fno ≤ 1.35. By providing the variable magnification lens group and the compensating lens group, the present invention realizes a large-aperture zoom lens with an F-number that can reach 1.0 to 1.35, improving the performance of the zoom lens.

Description

Technical Field

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

[0002] With the development of society, people's awareness of safety precautions continues to improve. Video surveillance systems are an indispensable technical means for security, and have gradually developed into a rigid demand in the field of enterprise and personal home security system construction. The security monitoring industry has also developed rapidly, and the role of monitoring has become increasingly important. At present, 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 collected images is low, the shooting effect is average, and the market penetration rate is not high. At the same time, the aperture of the zoom lens is usually smaller than that of the fixed-focus lens, resulting in a small amount of light entering the lens. In a dark environment, the shooting effect is difficult to meet the use requirements, which restricts the promotion of zoom lenses. As security equipment advances towards high definition and miniaturization, optical lenses are required to achieve ultra-wide angles, high resolutions, and large apertures while being miniaturized and lightweight. Summary of the invention

[0003] The main purpose of the present invention is to provide a zoom lens and a camera device, aiming to solve the technical problem that the small aperture of the existing zoom lens leads to a small amount of light entering the lens and poor shooting effect in a dark light environment.

[0004] To achieve the above object, the present invention provides a zoom lens, comprising a lens body, wherein the direction from the object side to the image side along the optical axis of the lens body is from front to back;

[0005] The lens body comprises:

[0006] A lens barrel is arranged in a front-to-back direction, and a cavity is formed in the lens barrel;

[0007] a variable power lens group, movably disposed in the cavity along the front-back direction, comprising a first lens group, a second lens group and a third lens group arranged from front to back, wherein the first lens group has a negative optical power, the second lens group has a positive optical power, and the third lens group has a positive optical power;

[0008] a compensating lens group, movably disposed in the cavity along a front-rear direction, the compensating lens group comprising a fourth lens group, the fourth lens group being disposed at the rear side of the third lens group and spaced apart from the third lens group, the fourth lens group having positive optical power; and,

[0009] A driving device, driving and connecting the variable magnification lens group and the compensation lens group;

[0010] The F-number of the zoom lens is Fno, 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, and the focal length of the fourth lens group is f4, satisfying the following relational expressions:

[0011] 1.0 ≤ Fno ≤ 1.35, -0.47 < fw / f1 < -0.15, 0.26 < fw / f2 < 0.52, 0.012 < fw / f3 < 0.046, 0.05 < fw / f4 < 0.58.

[0012] Optionally, the first lens group includes a first lens with a negative optical power, a second lens with a negative optical power, a third lens with a positive optical power, and a fourth lens with a negative optical power, which are arranged in sequence from front to back;

[0013] 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, and the focal length of the fourth lens is f14, satisfying the following relational expressions:

[0014] 0.15 < f1 / f11 < 0.77, 0.26 < f1 / f12 < 0.85, -0.85 < f1 / f13 < -0.24, 0.12 < f1 / f14 < 0.35.

[0015] Optionally, the second lens group includes a fifth lens with a negative optical power, a sixth lens with a positive optical power, and a seventh lens with a positive optical power, which are arranged in sequence from front to back;

[0016] The focal length of the fifth lens is f21, the focal length of the sixth lens is f22, and the focal length of the seventh lens is f23, satisfying the following relational expressions:

[0017] -0.61 < f2 / f21 < -0.12, 0.35 < f2 / f22 < 1.01, 0.62 < f2 / f23 < 1.35.

[0018] Optionally, the seventh lens is an aspherical lens.

[0019] Optionally, the third lens group includes an eighth lens with a negative optical power, a ninth lens with a positive optical power, a tenth lens with a negative optical power, and an eleventh lens with a positive optical power, which are arranged in sequence from front to back;

[0020] 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, and the focal length of the eleventh lens is f34, satisfying the following relational expressions:

[0021] -15.56 < f3 / f31 < -3.52, 4.5 < f3 / f32 < 11.5, -20.54 < f3 / f33 < -6.5, 1.5 < f3 / f34 < 7.23.

[0022] Optionally, the fourth lens group includes a twelfth lens with a positive focal power, a thirteenth lens with a negative focal power, and a fourteenth lens with a positive focal power, which are arranged in sequence from front to back;

[0023] The focal length of the twelfth lens is f41, the focal length of the thirteenth lens is f42, and the focal length of the fourteenth lens is f43, satisfying the following relational expressions:

[0024] 1.05 < f4 / f41 < 3.58, -5.58 < f4 / f42 < -0.58, 0.52 < f4 / f43 < 2.58.

[0025] Optionally, the fourteenth lens is an aspherical lens.

[0026] Optionally, the zoom lens further includes a diaphragm, the diaphragm is arranged between the second lens group and the third lens group, and the diaphragm is fixedly connected to the third lens group; or,

[0027] The third lens group includes a plurality of lenses arranged in sequence from front to back, the zoom lens further includes a diaphragm, and the diaphragm is arranged between two adjacent lenses of the third lens group.

[0028] Optionally, the distance from the diaphragm to the imaging surface of the zoom lens on the optical axis is L, and the overall optical length of the zoom lens is TTL, satisfying the following relational expression:

[0029] 0.26 < L / TTL < 0.75.

[0030] The present invention also provides an imaging device, the imaging device includes the zoom lens as described above, the zoom lens includes a lens body, and the direction along the optical axis of the lens body from the object side to the image side is from front to back;

[0031] The lens body includes:

[0032] A lens barrel, arranged along the front-back direction, and a cavity is formed inside the lens barrel;

[0033] A varifocal lens group, movably arranged in the cavity along the front-back direction, including a first lens group, a second lens group, and a third lens group arranged at intervals from front to back, the first lens group has a negative focal power, the second lens group has a positive focal power, and the third lens group has a positive focal power;

[0034] A compensating lens group is movably disposed in the cavity along the front-back direction. The compensating lens group includes a fourth lens group, which is disposed behind the third lens group and spaced from the third lens group, and the fourth lens group has a positive optical power; and,

[0035] A driving device is drivingly connected to the zoom lens group and the compensating lens group;

[0036] The F-number of the zoom lens is Fno, 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, and the focal length of the fourth lens group is f4, satisfying the following relational expressions:

[0037] 1.0 ≤ Fno ≤ 1.35, -0.47 < fw / f1 < -0.15, 0.26 < fw / f2 < 0.52, 0.012 < fw / f3 < 0.046, 0.05 < fw / f4 < 0.58.

[0038] In the technical solution of the present invention, the zoom lens includes a lens body. The direction from the object side to the image side along the optical axis of the lens body is from front to back; the lens body includes a lens barrel, a zoom lens group, a compensating lens group, and a driving device. The lens barrel is arranged along the front-back direction, and a cavity is formed inside the lens barrel; the zoom lens group is movably disposed in the cavity along the front-back direction and includes a first lens group, a second lens group, and a third lens group arranged at intervals from front to back. The first lens group has a negative optical power, the second lens group has a positive optical power, and the third lens group has a positive optical power; the compensating lens group is movably disposed in the cavity along the front-back direction. The compensating lens group includes a fourth lens group, which is disposed behind the third lens group and spaced from the third lens group, and the fourth lens group has a positive optical power; the driving device is drivingly connected to the zoom lens group and the compensating lens group; the F-number of the zoom lens is Fno, 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, and the focal length of the fourth lens group is f4, satisfying the following relational expressions:

[0039] 1.0 ≤ Fno ≤ 1.35, -0.47 < fw / f1 < -0.15, 0.26 < fw / f2 < 0.52, 0.012 < fw / f3 < 0.046, 0.05 < fw / f4 < 0.58.

[0040] In this solution, the first lens group, the second lens group, the third lens group, and the fourth lens group can be respectively arranged to move along the front-back direction, that is, the varifocal lens group and the compensating lens group move relative to each other, so that the focal length of the lens body can be adjusted, thus facilitating the application of the lens body in more scenarios; the zoom lens satisfies the relational expression 1.0 ≤ Fno ≤ 1.35, so that the zoom lens can be adapted to a large aperture. A large aperture can increase the light input of the lens, and in a low-light environment, the shooting effect can also be satisfied, which is suitable for lenses that need to be turned on for 24 hours such as security monitoring. Brief Description of the Drawings

[0041] 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 drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0042] Figure 1 Schematic structural diagram of the wide-angle end of an embodiment of the zoom lens provided by the present invention;

[0043] Figure 2 For Figure 1 Schematic structural diagram of the middle position of the zoom lens in

[0044] Figure 3 For Figure 1 Schematic structural diagram of the telephoto end of the zoom lens in

[0045] Figure 4 For Figure 1 MTF curve diagram of the wide-angle end of the zoom lens in

[0046] Figure 5 For Figure 1 MTF curve diagram of the middle position of the zoom lens in

[0047] Figure 6 For Figure 1 MTF curve diagram of the telephoto end of the zoom lens in

[0048] Explanation of the reference numerals in the drawings:

[0049]

[0050] The realization, functional characteristics, and advantages of the objectives of the present invention will be further described with reference to the embodiments and the drawings. Detailed Embodiments

[0051] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with 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. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0052] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention, the directional indications are only used to explain the relative position 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.

[0053] In addition, if there are descriptions such as "first" and "second" 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 such feature. 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 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 results in contradictions 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.

[0054] With the development of society, people's awareness of security prevention has been continuously improved. The video surveillance system is an essential technical means for security prevention and has gradually become a rigid demand in the field of enterprise and personal home security system construction. The security surveillance industry has also developed rapidly, and the role played by surveillance is becoming increasingly important. At present, fixed-focus lenses are still the main type of security video surveillance lenses. With the deep 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 been increasing year by year. However, since the imaging quality of zoom lenses is usually lower than that of fixed-focus lenses, the resolution of the collected 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 equipment 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.

[0055] In view of this, the present invention provides a zoom lens, aiming to solve the technical problem that the small aperture of the existing zoom lens results in a small amount of light entering the lens and poor shooting effects in low-light environments. Figures 1 to 3 This is an embodiment of the zoom lens provided by the present invention.

[0056] In the present invention, the zoom lens includes a lens body. The direction from the object side to the image side along the optical axis of the lens body is from front to back. The lens body includes a lens barrel, a variable-power lens group, a compensating lens group, and a driving device. The lens barrel is arranged in the front-back direction, and a cavity is formed inside the lens barrel. The variable-power lens group is movably arranged in the cavity in the front-back direction, and includes a first lens group 100, a second lens group 200, and a third lens group 300 arranged at intervals from front to back. The first lens group 100 has a negative optical power, the second lens group 200 has a positive optical power, and the third lens group 300 has a positive optical power. The compensating lens group is movably arranged in the cavity in the front-back direction. The compensating lens group includes a fourth lens group 400. The fourth lens group 400 is arranged behind the third lens group 300 and is spaced from the third lens group 300. The fourth lens group 400 has a positive optical power. The driving device is drivingly connected to the variable-power lens group and the compensating lens group. The F-number of the zoom lens is Fno, the focal length of the zoom lens 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, and the focal length of the fourth lens group 400 is f4, where: 1.0 ≤ Fno ≤ 1.35; and / or, -0.47 < fw / f1 < -0.15; and / or, 0.26 < fw / f2 < 0.52; and / or, 0.012 < fw / f3 < 0.046; and / or, 0.05 < fw / f4 < 0.58. Specifically, the ratio of the focal length of the zoom lens at the wide-angle end to the focal lengths of each lens group is as follows: fw / f1 = -(3 / 8), fw / f2 = 6 / 11, fw / f3 = 3 / 214, fw / f4 = 3 / 29.

[0057] In this solution, the first lens group 100, the second lens group 200, the third lens group 300, and the fourth lens group 400 can be respectively arranged to move in the front-back direction, that is, the varifocal lens group and the compensation lens group move relative to each other, so that the focal length of the lens body can be adjusted, facilitating the application of the lens body in more scenarios; the varifocal lens group mainly undertakes the varifocal function and can realize continuous zooming of the lens body from the wide-angle end to the telephoto end; the compensation lens group mainly undertakes the image plane compensation function and can compensate the image plane during the continuous zooming process of the lens body, thereby ensuring the imaging quality when the lens body continuously zooms. Therefore, under the combined action of the varifocal lens group and the compensation lens group, not only the focal length of the lens body is shortened, but also the imaging within this focal length range is clear. Furthermore, the volume of the lens can be reduced, facilitating the application of the zoom lens on electronic devices. At the same time, the F number is Fno, where 1.0 ≤ Fno ≤ 1.35, realizing a zoom lens with a small volume and a large aperture. A large aperture can increase the light input of the lens, and in a low-light environment, the shooting effect can also be satisfied, making it suitable for lenses that need to be turned on for 24 hours, such as security monitoring.

[0058] In the embodiment of the present invention, the first lens group 100 includes a first lens with a negative optical power, a second lens with a negative optical power, a third lens with a positive optical power, and a fourth lens with a negative optical power, which are arranged in sequence from front to back; 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, and the focal length of the fourth lens is f14, satisfying the following relational expressions:

[0059] 0.15 < f1 / f11 < 0.77, 0.26 < f1 / f12 < 0.85, -0.85 < f1 / f13 < -0.24, 0.12 < f1 / f14 < 0.35.

[0060] Specifically, the first lens is a convex-concave lens, that is, the object side surface of the first lens is convex and the image side surface is concave; the second lens is a biconcave lens, that is, the object side surface of the second lens is concave and the image side surface is concave; the third lens is a biconvex lens, that is, the object side surface of the third lens is convex and the image side surface is convex; the fourth lens is a concave-convex lens, that is, the object side surface of the fourth lens is concave and the image side surface is convex. And the specific ratios of the first lens group 100 to each lens are as follows: f1 / f11 = 8 / 11, f1 / f12 = 9 / 5, f1 / f13 = -(2 / 3), f1 / f14 = 4 / 13; the optical powers of the first lens, the second lens, the third lens, and the fourth lens are -22.21, -27.99, 24.21, and -52.56 in sequence.

[0061] Furthermore, the first lens and the second lens form a first cemented lens with a positive optical power, and satisfy the following conditions: -0.1 < f1 / f101 < -0.18; where f1 is the focal length of the first lens group 100, and f101 is the focal length of the first cemented lens; in this embodiment, the specific ratio of the first lens group 100 to the first cemented lens is f1 / f101 = -(1 / 7).

[0062] In this embodiment, the second lens group 200 includes a fifth lens with a negative optical power, a sixth lens with a positive optical power, and a seventh lens with a positive optical power, which are arranged in sequence from front to back; the focal length of the fifth lens is f21, the focal length of the sixth lens is f22, and the focal length of the seventh lens is f23, and they satisfy the following relational expressions:

[0063] -0.61 < f2 / f21 < -0.12, 0.35 < f2 / f22 < 1.01, 0.62 < f2 / f23 < 1.35.

[0064] Specifically, the fifth lens is a concave-convex lens, that is, the object side surface of the fifth lens is concave and the image side surface is convex, the sixth lens is a biconvex lens, and the seventh lens is a biconvex lens, and the specific ratios of the second lens group 200 to each of the lenses are as follows: f2 / f21 = -(7 / 22), f2 / f22 = 7 / 13, f2 / f23 = 21 / 25, and the optical powers of the fifth lens, the sixth lens, and the seventh lens are: -66.35, 38.93, 28.55 in sequence.

[0065] In the embodiment of the present invention, at least one of the sixth lens and the seventh lens in the second lens group 200 is an aspherical lens. Specifically, in this embodiment, the seventh lens is an aspherical lens.

[0066] In this embodiment, the third lens group 300 includes an eighth lens with a negative optical power, a ninth lens with a positive optical power, a tenth lens with a negative optical power, and an eleventh lens with a negative optical power, which are arranged in sequence from front to back; 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, and the focal length of the eleventh lens is f34, and they satisfy the following relational expressions:

[0067] -15.56 < f3 / f31 < -3.52, 4.5 < f3 / f32 < 11.5, -20.54 < f3 / f33 < -6.5, 1.5 < f3 / f34 < 7.23.

[0068] Specifically, the eighth lens is a convex-concave lens, that is, the object side of the eighth lens is convex and the image side is concave. The ninth lens is a biconvex lens, the tenth lens is a biconcave lens, and the eleventh lens is a biconvex lens. Moreover, the specific ratios of the third lens group 300 to each of the lenses therein are as follows: f3 / f31 = -(17 / 4), f3 / f32 = 39 / 4, f3 / f33 = -(61 / 5), f3 / f34 = 11 / 2. The optical powers of the eighth lens, the ninth lens, the tenth lens, and the eleventh lens are -4.34, 9.77, -12.25, and 5.57 in sequence.

[0069] Furthermore, the eighth lens, the ninth lens, and the tenth lens form a second cemented lens, and satisfy the following condition: -10.85 < f3 / f301 < -2.34; where f3 is the focal length of the third lens group 300, and f301 is the focal length of the second cemented lens. In this embodiment, the specific ratio of the third lens group 300 to the second cemented lens is f3 / f301 = -(13 / 3).

[0070] In this embodiment, the fourth lens group 400 includes a twelfth lens with a positive optical power, a thirteenth lens with a negative optical power, and a fourteenth lens with a positive optical power, which are arranged in sequence from front to back; the focal length of the twelfth lens is f41, the focal length of the thirteenth lens is f42, and the focal length of the fourteenth lens is f43, and they satisfy the following relational expressions:

[0071] 1.05 < f4 / f41 < 3.58, -5.58 < f4 / f42 < -0.58, 0.52 < f4 / f43 < 2.58.

[0072] Specifically, the twelfth lens is a biconvex lens, the thirteenth lens is a biconcave lens, the fourteenth lens is a convex-concave lens, and the specific ratios of the fourth lens group to each of the lenses therein are as follows: f4 / f41 = 7 / 4, f4 / f42 = -(7 / 4), f4 / f43 = 9 / 10. The optical powers of the twelfth lens 41 to the fourteenth lens are 37.79, -37.54, and 71.28 in sequence.

[0073] In the embodiment of the present invention, at least one of the thirteenth lens and the fourteenth lens in the fourth lens group 400 is an aspherical lens. Specifically, in this embodiment, the fourteenth lens is an aspherical lens.

[0074] It should be noted that the characteristics of an aspherical lens are as follows: from the center to the periphery of the lens, the curvature changes continuously. Different from a spherical lens with a constant curvature from the center 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.

[0075] In the technical solution of the present invention, the zoom lens further includes a diaphragm 500, the diaphragm 500 is arranged between the second lens group 200 and the third lens group 300, and the diaphragm 500 is fixedly connected to the third lens group 300; alternatively, the third lens group 300 includes a plurality of lenses arranged in sequence from front to back, the zoom lens further includes a diaphragm 500, and the diaphragm 500 is arranged between two adjacent lenses of the third lens group 300.

[0076] Specifically, in this embodiment, the diaphragm 500 is arranged between the second lens group 200 and the third lens group 300 and is fixedly connected to the third lens group 300 so as to be driven by the third lens group 300 to move in the front-back direction. The diaphragm 500 is an aperture stop, and the aperture stop can limit the imaging light beam to the greatest extent; the position of the diaphragm 500 and the size of its light passing hole are directly related to the brightness, clarity, and the size of some aberrations of the image formed by the lens body. By arranging the diaphragm 500 on the front side of the third lens group 300 and moving synchronously in the front-back direction with the third lens group 300, it is possible to make the imaging have appropriate brightness and clarity during the zooming process of the lens body.

[0077] It should be noted that the smaller the light passing hole of the diaphragm 500, the smaller the spherical aberration, the clearer the image, and the greater the depth of field, but the weaker the brightness of the image; on the contrary, the larger the light passing hole of the diaphragm 500, the stronger the brightness of the image, the larger the spherical aberration, the relatively worse the clarity, and the smaller the depth of field. Therefore, in this embodiment, the light passing hole of the diaphragm 500 can be set to a fixed size or can be set to be adjustable within a certain size range.

[0078] Further, the distance from the diaphragm 500 to the imaging surface of the zoom lens on the optical axis is L, and the total optical length of the zoom lens is TTL. The zoom lens satisfies the following condition: 0.26 < L / TTL < 0.75, where L is the distance from the diaphragm 500 to the imaging surface of the zoom lens on the optical axis, and TTL is the total optical length of the zoom lens. In this embodiment, 0.36 < L / TTL < 0.61, and the diaphragm 500 is an adjustable diaphragm. The adjustable diaphragm can perform corresponding aperture scaling measures according to the change of ambient light intensity. The diaphragm 500 is used to limit the light beam to further improve the imaging quality of the zoom lens.

[0079] In an embodiment of the present invention, the zoom lens further includes a filter. The filter is located between the fourteenth lens and the photosensitive chip. The filter is used to filter unnecessary wavelength bands of light and stray light, thereby improving the imaging quality.

[0080] Further, the zoom lens further includes a protective glass. The protective glass is disposed between the filter and the photosensitive chip to prevent internal components (such as chips) of the zoom lens from being damaged.

[0081] Specifically, please refer to Tables 1 to 3 below. Tables 1 to 3 provide specific data for implementing the zoom lens in the first embodiment.

[0082] Among them, S1 to S29 in Table 1 represent the surface numbers of each optical element, R represents the curvature radius of the optical element, D represents the thickness of the optical element or the air gap, N d represents the d-light refractive index of the optical material used, and V d represents the d-light Abbe number of the optical material used; Table 2 gives the aspheric coefficients of all surfaces of the aspheric lens, where R represents the curvature radius of the optical element, and A to F are even-order aspheric coefficients; f ′ in Table 3 represents the system focal length, F-number is the system F number, ω is the system half field of view angle, D7 represents the variable spacing between the first lens group 100 and the second lens group 200, D13 represents the variable spacing between the second lens group 200 and the third lens group 300, D20 represents the variable spacing between the third lens group 300 and the fourth lens group 400, and D26 represents the variable spacing between the fourth lens group 400 and the image plane; the seventh lens and the fourteenth lens are aspheric lenses.

[0083] Table 1

[0084]

[0085] Table 2

[0086]

[0087] Table 3

[0088]

[0089] In addition, the present invention further provides an imaging device, and the imaging device includes the zoom lens described in the above technical solution. It should be noted that the detailed structure of the continuous zoom optical lens in the imaging device may refer to the embodiments of the above zoom lens, which will not be elaborated here; since the above zoom lens is used in the imaging device of the present invention, therefore, the embodiments of the imaging device of the present invention include all the technical solutions of all the embodiments of the above zoom lens, and the achieved technical effects are also exactly the same, which will not be elaborated here.

[0090] 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 any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A zoom lens, characterized in that, It includes a lens body, and the direction from the object side to the image side along the optical axis of the lens body is from front to back; The lens body includes: A lens barrel arranged along the front-back direction, and a cavity is formed inside the lens barrel; A zoom lens group movably arranged in the cavity along the front-back direction, including a first lens group, a second lens group and a third lens group arranged at intervals from front to back. The first lens group has a negative optical power, the second lens group has a positive optical power, and the third lens group has a positive optical power; A compensation lens group movably arranged in the cavity along the front-back direction. The compensation lens group includes a fourth lens group. The fourth lens group is arranged at the rear side of the third lens group and is spaced from the third lens group. The fourth lens group has a positive optical power; and, A driving device drivingly connected to the zoom lens group and the compensation lens group; The F-number of the zoom lens is Fno, 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, and the focal length of the fourth lens group is f4, satisfying the following relational expressions: 1.0≤Fno≤1.35, -0.47<fw / f1<-0.15, 0.26<fw / f2<0.52, 0.012<fw / f3<0.046, 0.05<fw / f4<0.

58.

2. The zoom lens according to claim 1, wherein The first lens group includes a first lens with negative optical power, a second lens with negative optical power, a third lens with positive optical power and a fourth lens with negative optical power arranged in sequence from front to back; 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, and the focal length of the fourth lens is f14, satisfying the following relational expressions: 0.15<f1 / f11<0.77, 0.26<f1 / f12<0.85, -0.85<f1 / f13<-0.24, 0.12<f1 / f14<0.

35.

3. The zoom lens according to claim 1, characterized in that, The second lens group includes a fifth lens with negative optical power, a sixth lens with positive optical power and a seventh lens with positive optical power arranged in sequence from front to back; The focal length of the fifth lens is f21, the focal length of the sixth lens is f22, and the focal length of the seventh lens is f23, satisfying the following relational expressions: -0.61<f2 / f21<-0.12, 0.35<f2 / f22<1.01, 0.62<f2 / f23<1.

35.

4. The zoom lens according to claim 3, wherein, The seventh lens is an aspherical lens.

5. The zoom lens according to claim 1, wherein The third lens group includes an eighth lens with negative optical power, a ninth lens with positive optical power, a tenth lens with negative optical power and an eleventh lens with positive optical power arranged in sequence from front to back; 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, and the focal length of the eleventh lens is f34, satisfying the following relational expressions: -15.56 < f3 / f31 < -3.52, 4.5 < f3 / f32 < 11.5, -20.54 < f3 / f33 < -6.5, 1.5 < f3 / f34 < 7.

23.

6. The zoom lens according to claim 1, characterized in that, The fourth lens group includes a twelfth lens with a positive optical power, a thirteenth lens with a negative optical power, and a fourteenth lens with a positive optical power, which are arranged in sequence from front to back; The focal length of the twelfth lens is f41, the focal length of the thirteenth lens is f42, and the focal length of the fourteenth lens is f43, satisfying the following relational expressions: 1.05 < f4 / f41 < 3.58, -5.58 < f4 / f42 < -0.58, 0.52 < f4 / f43 < 2.

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7. The zoom lens according to claim 6, wherein, The fourteenth lens is an aspherical lens.

8. The zoom lens according to claim 1, wherein The zoom lens further includes a diaphragm, the diaphragm is arranged between the second lens group and the third lens group, and the diaphragm is fixedly connected to the third lens group; or, The third lens group includes a plurality of lenses arranged in sequence from front to back, the zoom lens further includes a diaphragm, and the diaphragm is arranged between two adjacent lenses of the third lens group.

9. The zoom lens according to claim 8, characterized in that, The distance from the diaphragm to the imaging surface of the zoom lens on the optical axis is L, and the overall optical length of the zoom lens is TTL, satisfying the following relational expression: 0.26 < L / TTL < 0.

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10. An imaging device, characterized in that, A zoom lens comprising the zoom lens according to any one of claims 1 to 9.

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