Zoom lens and imaging device

Abstract

The application discloses a zoom lens and an imaging device, wherein the zoom lens comprises a lens body, a direction from an object side to an image side of the optical axis of the lens body is from front to back; the lens body comprises a lens barrel, a fixed group and a moving group; the lens barrel is arranged in the front-back direction, and a cavity is formed in the lens barrel; the fixed group is fixed in the cavity and comprises a first lens group with positive refractive power and a sixth lens group with positive refractive power; the moving group is movably arranged in the cavity in the front-back direction and is between the first lens group and the sixth lens group, and comprises a second lens group with negative refractive power, a third lens group with positive refractive power, a fourth lens group with positive refractive power and a fifth lens group with positive refractive power, and the second lens group, the third lens group and the fifth lens group are movably arranged in linkage, wherein the second lens group comprises at least two aspheric glass lenses, the third lens group, the fifth lens group and the sixth lens group each comprise at least one aspheric glass lens.

Description

Technical Field

[0001] This invention relates to the field of optical lens technology, and in particular to a zoom lens and imaging device. Background Technology

[0002] The use of zoom lenses is now very common. Taking the widely used zoom surveillance lens as an example, the resolution of zoom surveillance lenses is generally 1920*1080, which results in insufficient detail reproduction of the monitored scene; in addition, the existing zoom lenses have complex internal structures and high costs. Summary of the Invention

[0003] The main objective of this invention is to provide a zoom lens and imaging device that addresses the problems of low resolution, insufficient detail reproduction, complex structure, and high cost of existing zoom lenses.

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

[0005] The lens body includes:

[0006] The lens tube is arranged along the front-to-back direction, and a cavity is formed inside the lens tube;

[0007] A fixed group, fixed within the cavity, includes a first lens group with positive optical power and a sixth lens group with positive optical power arranged sequentially from front to back; and...

[0008] The movable group is movably disposed in the cavity along the front-to-back direction and is located between the first lens group and the sixth lens group. It includes a second lens group with negative optical power, a third lens group with positive optical power, a fourth lens group with positive optical power, and a fifth lens group with positive optical power arranged sequentially from front to back. The second lens group, the third lens group, and the fifth lens group are linked together.

[0009] The second lens group includes at least two aspherical glass lenses, and the third lens group, the fifth lens group, and the sixth lens group each include at least one aspherical glass lens.

[0010] The focal length of the lens body at the wide-angle end is f. w The focal lengths of the first lens group are f1, the second lens group is f2, the third lens group is f3, the fourth lens group is f4, the fifth lens group is f5, and the sixth lens group is f6, satisfying the following relationship:

[0011]

[0012] Optionally, the first lens group includes a first lens group with negative optical power, a third lens with positive optical power, a fourth lens with positive optical power, and a fifth lens with positive optical power arranged sequentially from front to back. The first lens group includes a first lens with negative optical power and a second lens with positive optical power cemented together.

[0013] Wherein, the focal length of the first lens group is f1, and the focal length of the first lens is f 11 The focal length of the second lens is f. 12 The focal length of the third lens is f. 13 The focal length of the fourth lens is f. 14 The focal length of the fifth lens is f. 15 The effective aperture of the first lens is Φ L11 The total optical length of the lens body is TTL, satisfying the following relationship:

[0014]

[0015] Optionally, the second lens group includes a sixth lens with negative optical power, a seventh lens with negative optical power, an eighth lens with positive optical power, and a ninth lens with negative optical power arranged sequentially from front to back, wherein the seventh lens and the ninth lens are configured as aspherical glass lenses.

[0016] Wherein, the focal length of the second lens group is f2, and the focal length of the sixth lens is f 21 The focal length of the seventh lens is f. 22 The focal length of the eighth lens is f. 23 The focal length of the ninth lens is f. 24 It satisfies the following relationship:

[0017]

[0018] Optionally, the third lens group includes a tenth lens with positive optical power, an eleventh lens with positive optical power, and a second lens group with negative optical power arranged sequentially from front to back. The tenth lens is configured as an aspherical glass lens, and the second lens group includes a twelfth lens with positive optical power and a thirteenth lens with negative optical power cemented together.

[0019] Wherein, the focal length of the third lens group is f3, and the focal length of the tenth lens is f 31 The focal length of the eleventh lens is f. 32 The focal length of the twelfth lens is f. 33 The focal length of the thirteenth lens is f. 34 The focal length of the second lens group is f.35 It satisfies the following relationship:

[0020]

[0021] Optionally, the fourth lens group includes a fourteenth lens with positive optical power;

[0022] Wherein, the focal length of the fourth lens group is f4, and the focal length of the fourteenth lens is f 41 It satisfies the following relationship:

[0023] Optionally, the fifth lens group includes a fifteenth lens with negative optical power and a sixteenth lens with positive optical power arranged sequentially from front to back, wherein the sixteenth lens is configured as an aspherical glass lens;

[0024] Wherein, the focal length of the fifth lens group is f5, and the focal length of the fifteenth lens is f 51 The focal length of the sixteenth lens is f. 52 It satisfies the following relationship:

[0025]

[0026] Optionally, the sixth lens group includes a seventeenth lens with positive optical power, and the seventeenth lens is configured as an aspherical glass lens;

[0027] Wherein, the focal length of the sixth lens group is f6, and the focal length of the seventeenth lens is f 61 It satisfies the following relationship:

[0028] Optionally, the relative displacement of the front vertex of the second lens group when the lens body is in the wide-angle position and when the lens body is in the telephoto position is ΔZ1. W-T The total optical length of the lens body is TTL, and And / or,

[0029] The relative displacement of the front apex of the third lens group when the lens body is in the wide-angle position and when the lens body is in the telephoto position is ΔZ2. W-T The total optical length of the lens body is TTL, and And / or,

[0030] The relative displacement of the front vertex of the fifth lens group when the lens body is in the wide-angle position and when the lens body is in the telephoto position is ΔZ3. W-T The total optical length of the lens body is TTL, and

[0031] Optionally, the lens body further includes an aperture stop disposed in the cavity, the aperture stop being located between the second lens group and the third lens group, wherein the distance from the aperture stop to the image plane of the lens body is Ls~IMG, and the total optical length of the lens body is TTL, and And / or,

[0032] The lens body further includes a beam-splitting element disposed in the cavity, the beam-splitting element being located behind the sixth lens group; and / or,

[0033] The lens body also includes a photosensitive chip disposed in the cavity, and the photosensitive chip is located on the rear side of the sixth lens group.

[0034] The present invention also provides an imaging device, which includes the above-described zoom lens.

[0035] In the technical solution of this invention, the lens body adopts a six-group structure of "positive-negative-positive-positive-positive + aspherical". The second, third, and fifth lens groups are three zoom groups, the fourth lens group is a focusing group, and the first and sixth lens groups are two fixed groups. Since the six lens groups are arranged sequentially from front to back, and the lens body contains five aspherical glass lenses, the internal structure of the lens body is simplified and manufacturing costs are reduced while achieving wide angle, low distortion, large image plane, low temperature drift, and high zoom ratio. Because the lens body uses aspherical glass lenses, optimized compensation minimizes the impact of temperature changes on the lens... The performance of the main body is minimally affected, with very little change in back focus. This ensures stable performance even in diverse indoor environments, eliminating the need for refocusing. Existing high-pixel surveillance lenses cannot achieve confocal focusing in high and low temperature environments, and after focusing under normal white light and temperature, severe focus shift occurs when switching to high or low temperature environments, resulting in blurred images. Since the main body maintains stable performance even in diverse indoor environments, this solves the focus shift problem in high and low temperature environments, thus ensuring consistent image quality across different conditions. Furthermore, during use, as the second... The lens group, the third lens group, and the fifth lens group move forward and backward, and the focal lengths of the second lens group, the third lens group, and the fifth lens group all change. Taking a 1 / 1.2”, 16:9 CCD as an example, the focal length of the lens body can vary from 9.93mm at the wide-angle end to 178.5mm at the telephoto end, and the shooting angle at the wide-angle end is >61°. At the same time, the optical distortion of the lens body at the wide-angle end and the telephoto end is less than 1%, so that the lens body can achieve the effects of wide angle, low distortion, and large zoom. In addition, since the lens body is based on the first lens group as the highest point, the relative position of the first lens group and the image plane of the lens body... It is fixed, that is, its distance is less than 170mm; by arranging each lens group and limiting the ratio of the focal length of the lens body at the wide-angle end to the focal length of each lens group, the zoom lens can achieve a resolution higher than 4K (8 million pixels). Taking the 1 / 1.2” lens body as an example, the zoom lens in this invention can achieve a center resolution higher than 300lp / mm and a peripheral resolution higher than 1400TVline at the 70% diagonal position. Since the peripheral resolution of existing high-pixel surveillance lenses is low, this not only improves the resolution of the zoom lens, but also enables the zoom lens to clearly image the entire picture. Attached Figure Description

[0036] 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.

[0037] Figure 1 A schematic diagram of the structure of a first embodiment of the zoom lens provided by the present invention;

[0038] Figure 2 for Figure 1 MTF curve of the wide-angle end of the main lens;

[0039] Figure 3 for Figure 1 MTF curve of the telephoto end of the main lens.

[0040] Explanation of reference numerals in the accompanying drawings of the embodiments provided in this invention:

[0041] label name label name 100 zoom lens 31 Tenth Lens 101 Lens main body 32 Eleventh Lens 1 First lens group 33 The Twelfth Lens 11 First lens 34 The Thirteenth Lens 12 Second lens 4 Fourth lens group 13 Third lens 41 Fourteenth Lens 14 Fourth lens 5 Fifth lens group 15 Fifth lens 51 The Fifteenth Lens 2 Second lens group 52 The Sixteenth Lens 21 Sixth lens 6 Sixth Lens Group 22 Seventh Lens 61 The Seventeenth Lens 23 Eighth lens 7 Aperture 24 Ninth Lens 8 Photosensitive chip 3 Third lens group

[0042] 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

[0043] 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.

[0044] 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.

[0045] 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.

[0046] The use of zoom lenses is now very common. Taking the widely used zoom surveillance lens as an example, the resolution of zoom surveillance lenses is generally 1920*1080, which results in insufficient detail reproduction of the monitored scene; in addition, the existing zoom lenses have complex internal structures and high costs.

[0047] In view of this, the present invention proposes a zoom lens and imaging device to solve the problems of low resolution, insufficient detail reproduction capability, complex structure and high cost of existing zoom lenses. Figures 1 to 3 This is a specific embodiment of the zoom lens provided by the present invention.

[0048] Please see Figure 1 In this invention, the zoom lens 100 includes a lens body 101, with the optical axis of the lens body 101 running from front to back from the object side to the image side. The lens body 101 includes a lens barrel (not shown in the figure), a fixed group, and a movable group. The lens barrel is arranged in the front-back direction, and a cavity is formed inside the lens barrel. The fixed group is fixed in the cavity and includes a first lens group 1 with positive optical power and a sixth lens group 6 with positive optical power arranged sequentially from front to back. The movable group is movably disposed in the cavity in the front-back direction and is located between the first lens group 1 and the sixth lens group 6. It includes a second lens group 2 with negative optical power, a third lens group 3 with positive optical power, a fourth lens group 4 with positive optical power, and a fifth lens group 5 with positive optical power arranged sequentially from front to back. The second lens group 2, the third lens group 3, and the fifth lens group 5 are linked together. The focal length of the lens body 101 at the wide-angle end is f. wThe focal lengths of the first lens group 1 are f1, the second lens group 2 are f2, the third lens group 3 is f3, the fourth lens group 4 is f4, the fifth lens group 5 is f5, and the sixth lens group 6 is f6, satisfying the following relationship:

[0049]

[0050] In the technical solution of this invention, the lens body 101 adopts a six-group structure of "positive-negative-positive-positive-positive + aspherical". The second lens group 2, the third lens group 3, and the fifth lens group 5 are three zoom groups, the fourth lens group 4 is a focusing group, and the first lens group 1 and the sixth lens group 6 are two fixed groups. Since the six lens groups are arranged sequentially from front to back, and the lens body 101 contains five aspherical glass lenses, the internal structure of the lens body 101 is simplified and manufacturing costs are reduced while achieving wide angle, low distortion, large image plane, low temperature drift, and high magnification. The aspherical glass lens used in the lens body 101, through optimized compensation, minimizes the impact of temperature changes on the performance of the lens body 101, resulting in minimal back focus variation. This ensures stable performance of the lens body 101 even in varying indoor environments, eliminating the need for refocusing. Existing high-pixel surveillance lenses cannot achieve confocal focusing in high and low temperature environments, and after focusing under normal white light conditions, severe focus drift occurs when switching to high or low temperature environments, causing blurry images of the lens body 101. Because the lens body 101 maintains stable performance even in varying indoor environments, it effectively solves this problem. This solves the problem of focus drift in high and low temperature environments for the lens body 101, thus ensuring consistent image quality under different conditions. Simultaneously, during use, as the second lens group 2, the third lens group 3, and the fifth lens group 5 move forward and backward, their focal lengths all change. Taking a 1 / 1.2”, 16:9 CCD as an example, the focal length of the lens body 101 can vary from 9.93mm at the wide-angle end to 178.5mm at the telephoto end, with a horizontal shooting angle >61° at the wide-angle end. The optical distortion of the lens body 101 at both the wide-angle and telephoto ends is less than 1%, enabling the lens body 101 to achieve wide-angle, low-distortion, and high-magnification effects. Simultaneously, since the first lens group 1 is the highest point of the lens body 101, the relative position of the image plane of the first lens group 1 and the lens body 101 is fixed, i.e., their distance is less than 170mm. Through the arrangement of each lens group and by limiting the ratio of the focal length of the lens body 101 at the wide-angle end to the focal length of each lens group, the zoom lens 100 can achieve a resolution higher than 4K (8 megapixels), at 1 / 1.Taking the lens body 101 of the 2” as an example, the zoom lens 100 of the present invention can achieve a center resolution higher than 300 lp / mm and a peripheral resolution higher than 1400 TV lines at the 70% diagonal position. Since the peripheral resolution of existing high-pixel surveillance lenses is relatively low, this invention not only improves the resolution of the zoom lens 100, but also enables the zoom lens 100 to achieve clear imaging across the entire image.

[0051] It should be noted that existing surveillance lenses generally produce a lot of noise when shooting in low-light environments of 5 degrees. Since the lens body 101 in this invention uses a large aperture, the light transmission of the lens body 101 is increased, thereby greatly reducing noise.

[0052] The first lens group 1 includes, from front to back, a first lens group with negative optical power, a third lens 13 with positive optical power, a fourth lens 14 with positive optical power, and a fifth lens 15 with positive optical power. The first lens group includes a first lens 11 with negative optical power and a second lens 12 with positive optical power cemented together. The focal length of the first lens group 1 is f1, and the focal length of the first lens is f. 11 The focal length of the second lens 12 is f. 12 The focal length of the third lens 13 is f. 13 The focal length of the fourth lens 14 is f. 14 The focal length of the fifth lens 15 is f. 15 The effective light-transmitting aperture of the first lens 11 is Φ L11 The total optical length of the lens body 101 is TTL, satisfying the following relationship:

[0053]

[0054] The second lens group 2 includes, from front to back, a sixth lens 21 with negative optical power, a seventh lens 22 with negative optical power, an eighth lens 23 with positive optical power, and a ninth lens 24 with negative optical power. The seventh lens 22 and the ninth lens 24 are aspherical glass lenses. The focal length of the second lens group 2 is f2, and the focal length of the sixth lens 21 is f. 21 The focal length of the seventh lens 22 is f. 22 The focal length of the eighth lens 23 is f. 23 The focal length of the ninth lens 24 is f. 24 It satisfies the following relationship:

[0055]

[0056] The third lens group 3 includes, from front to back, a tenth lens 31 with positive optical power, an eleventh lens 32 with positive optical power, and a second lens group with negative optical power. The tenth lens 31 is an aspherical glass lens. The second lens group includes a twelfth lens 33 with positive optical power and a thirteenth lens 34 with negative optical power, cemented together. The focal length of the third lens group 3 is f3, and the focal length of the tenth lens 31 is f. 31 The focal length of the eleventh lens 32 is f. 32 The focal length of the twelfth lens 33 is f. 33 The focal length of the thirteenth lens 33 is f. 34 The focal length of the second lens group is f. 35 It satisfies the following relationship:

[0057]

[0058] The fourth lens group 4 includes a fourteenth lens 41 with positive optical power; wherein the focal length of the fourth lens group is f4, and the focal length of the fourteenth lens is f. 41 It satisfies the following relationship:

[0059] The fifth lens group 5 includes a fifteenth lens 51 with negative optical power and a sixteenth lens 52 with positive optical power, arranged sequentially from front to back. The sixteenth lens 52 is an aspherical lens. The focal length of the fifth lens group 5 is f5, and the focal length of the fifteenth lens 51 is f. 51 The focal length of the sixteenth lens 52 is f. 52 It satisfies the following relationship:

[0060] The sixth lens group 6 includes a seventeenth lens 61 with positive optical power, and the seventeenth lens 61 is configured as an aspherical lens; wherein, the focal length of the sixth lens group 6 is f6, and the focal length of the seventeenth lens 61 is f 61 It satisfies the following relationship:

[0061] In this invention, the relative displacement of the front vertex of the second lens group 2 when the lens body 101 is in the wide-angle position and when the lens body 101 is in the telephoto position is ΔZ1W-T, and the total optical length of the lens body 101 is TTL. In this invention, the relative displacement of the front vertex of the third lens group 3 when the lens body 101 is in the wide-angle position and when the lens body 101 is in the telephoto position is ΔZ2W-T, and the total optical length of the lens body 101 is TTL.

[0062] In this invention, the relative displacement of the front vertex of the fifth lens group 5 when the lens body 101 is in the wide-angle position and when the lens body 101 is in the telephoto position is ΔZ3W-T, and the total optical length of the lens body 101 is TTL.

[0063] It should be noted that the above three technical features can be selected as one, two, or simultaneously; specifically, in this embodiment, the above three technical features are simultaneously set; that is, the relative displacement of the front vertex of the second lens group 2 when the lens body 101 is in the wide-angle position and the relative displacement of the lens body 101 when the lens body 101 is in the telephoto position is ΔZ1W-T, the relative displacement of the front vertex of the third lens group 3 when the lens body 101 is in the wide-angle position and the relative displacement of the lens body 101 when the lens body 101 is in the telephoto position is ΔZ2W-T, the relative displacement of the front vertex of the fifth lens group 5 when the lens body 101 is in the wide-angle position and the relative displacement of the lens body 101 when the lens body 101 is in the telephoto position is ΔZ3W-T, and the total optical length of the lens body 101 is TTL, and

[0064] In this invention, the lens body 101 further includes an aperture stop 7 disposed in the cavity, the aperture stop 7 being located between the second lens group 2 and the third lens group 3, wherein the distance from the aperture stop 7 to the image plane of the lens body 101 is Ls to IMG, and the total optical length of the lens body 101 is TTL. It should be noted that in this invention, the aperture 7 is an adjustable aperture 7. When at the wide-angle end, the aperture of the adjustable aperture 7 can be adjusted to 1.6, and when at the telephoto end, the aperture of the adjustable aperture 7 can be adjusted to 3.8, so that the lens body 101 has extremely high light sensitivity, thereby enabling the lens body 101 to still capture clear images in relatively dark environments.

[0065] In this invention, the lens body 101 further includes a beam splitter 8 disposed in the cavity, the beam splitter 8 being located behind the sixth lens group 6; since existing high-pixel surveillance lenses capture black and white images in nighttime environments, by placing the beam splitter 8 behind the sixth lens group 6, and the beam splitter 8 being able to separate the visible light path and the infrared light path, the visible light and infrared light can be imaged on different imaging surfaces respectively, and then through software processing, color images can be captured in nighttime environments; thereby improving the color reproduction capability of the zoom lens 100 in nighttime shooting.

[0066] In this invention, the lens body 101 further includes a photosensitive chip disposed in the cavity, and the photosensitive chip is located on the rear side of the sixth lens group 6.

[0067] It should be noted that the above three technical features can be selected as one, two, or simultaneously; specifically, in this embodiment, the above three technical features are simultaneously provided; that is, the lens body 101 also includes an aperture stop 7, a beam splitter 8, and a photosensitive chip disposed in the cavity; the aperture stop 7 is located between the second lens group 2 and the third lens group 3, wherein the distance from the aperture stop 7 to the image plane of the lens body 101 is Ls~IMG, the total optical length of the lens body 101 is TTL, and The beam splitter 8 is located behind the sixth lens group 6; the photosensitive chip is located behind the sixth lens group 6. This arrangement enables the zoom lens 100 to capture clearer images in darker environments, while also enabling the zoom lens 100 to capture color images in nighttime environments, thereby improving the chromatic aberration reproduction capability of the zoom lens 100 in nighttime shooting.

[0068] The following analysis uses specific embodiments as examples.

[0069] In this embodiment, the system parameters of the zoom lens 100 are as follows:

[0070] The focal length at the wide-angle end is EFL_W = 9.93mm, and the focal length at the telephoto end is EFL_T = 178.5mm; the aperture number at the wide-angle end is Fno_W = 1.6, and the aperture number at the telephoto end is Fno_T = 3.8; the horizontal field angle at the wide-angle end is FOVH_W = 61.3°, and the field angle at the telephoto end is FOVH_T = 3.54°; the system optical distortion is ∈ (-7%, 1%); the total optical length of the optical system (i.e., the distance from the center vertex of the front surface of the first lens 11 to the image plane) is TTL = 170mm;

[0071] In this embodiment, the refractive index, radius of curvature, and thickness intervals of each lens are as follows:

[0072]

[0073]

[0074] In this embodiment, the corresponding conic coefficient (K) and aspherical coefficients (A, B, C, D, E, F) of each aspherical lens are as follows:

[0075]

[0076] Please see Figure 2 and Figure 3 , Figure 2 and Figure 3 These are the MTF curves of the lens body 101 at the wide-angle end and the MTF curves of the lens body 101 at the telephoto end, respectively.

[0077] Furthermore, the present invention also provides an imaging device, which includes the zoom lens 100 described in the above-described technical solution. It should be noted that the detailed structure of the zoom lens 100 in the imaging device can be referred to the embodiments of the zoom lens 100 described above, and will not be repeated here. Since the zoom lens 100 is used in the imaging device of the present invention, the embodiments of the imaging device of the present invention include all the technical solutions of all the embodiments of the zoom lens 100 described above, and the achieved technical effects are also completely the same, and will not be repeated here.

[0078] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any 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, Includes the 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; The lens body includes: The lens tube is arranged along the front-to-back direction, and a cavity is formed inside the lens tube; A fixed group, fixed within the cavity, includes a first lens group with positive optical power and a sixth lens group with positive optical power arranged sequentially from front to back; and... The movable group is movably disposed in the cavity along the front-to-back direction and is located between the first lens group and the sixth lens group. It includes a second lens group with negative optical power, a third lens group with positive optical power, a fourth lens group with positive optical power, and a fifth lens group with positive optical power arranged sequentially from front to back. The second lens group, the third lens group, and the fifth lens group are linked together. The second lens group includes at least two aspherical glass lenses, and the third lens group, the fifth lens group, and the sixth lens group each include at least one aspherical glass lens. The focal length of the lens body at the wide-angle end is f. w The focal lengths of the first lens group are f1, the second lens group is f2, the third lens group is f3, the fourth lens group is f4, the fifth lens group is f5, and the sixth lens group is f6, satisfying the following relationship:

2. The zoom lens according to claim 1, characterized in that, The first lens group includes a first lens group with negative optical power, a third lens with positive optical power, a fourth lens with positive optical power, and a fifth lens with positive optical power arranged sequentially from front to back. The first lens group includes a first lens with negative optical power and a second lens with positive optical power cemented together. Wherein, the focal length of the first lens group is f1, and the focal length of the first lens is f 11 The focal length of the second lens is f. 12 The focal length of the third lens is f. 13 The focal length of the fourth lens is f. 14 The focal length of the fifth lens is f. 15 The effective aperture of the first lens is Φ L11 The total optical length of the lens body is TTL, satisfying the following relationship:

3. The zoom lens according to claim 1, characterized in that, The second lens group includes a sixth lens with negative optical power, a seventh lens with negative optical power, an eighth lens with positive optical power, and a ninth lens with negative optical power arranged sequentially from front to back. The seventh lens and the ninth lens are configured as aspherical glass lenses. Wherein, the focal length of the second lens group is f2, and the focal length of the sixth lens is f 21 The focal length of the seventh lens is f. 22 The focal length of the eighth lens is f. 23 The focal length of the ninth lens is f. 24 It satisfies the following relationship:

4. The zoom lens according to claim 1, characterized in that, The third lens group includes a tenth lens with positive optical power, an eleventh lens with positive optical power, and a second lens group with negative optical power arranged sequentially from front to back. The tenth lens is an aspherical glass lens, and the second lens group includes a twelfth lens with positive optical power and a thirteenth lens with negative optical power cemented together. Wherein, the focal length of the third lens group is f3, and the focal length of the tenth lens is f 31 The focal length of the eleventh lens is f. 32 The focal length of the twelfth lens is f. 33 The focal length of the thirteenth lens is f. 34 The focal length of the second lens group is f. 35 It satisfies the following relationship:

5. The zoom lens according to claim 1, characterized in that, The fourth lens group includes a fourteenth lens with positive optical power; Wherein, the focal length of the fourth lens group is f4, and the focal length of the fourteenth lens is f 41 It satisfies the following relationship:

6. The zoom lens according to claim 1, characterized in that, The fifth lens group includes a fifteenth lens with negative optical power and a sixteenth lens with positive optical power arranged sequentially from front to back. The sixteenth lens is configured as an aspherical glass lens. Wherein, the focal length of the fifth lens group is f5, and the focal length of the fifteenth lens is f 51 The focal length of the sixteenth lens is f. 52 It satisfies the following relationship:

7. The zoom lens according to claim 1, characterized in that, The sixth lens group includes a seventeenth lens with positive optical power, and the seventeenth lens is configured as an aspherical glass lens; Wherein, the focal length of the sixth lens group is f6, and the focal length of the seventeenth lens is f 61 It satisfies the following relationship:

8. The zoom lens according to claim 1, characterized in that, The relative displacement of the front vertex of the second lens group when the lens body is in the wide-angle position and when the lens body is in the telephoto position is ΔZ1. W-T The total optical length of the lens body is TTL, and And / or, The relative displacement of the front apex of the third lens group when the lens body is in the wide-angle position and when the lens body is in the telephoto position is ΔZ2. W-T The total optical length of the lens body is TTL, and And / or, The relative displacement of the front vertex of the fifth lens group when the lens body is in the wide-angle position and when the lens body is in the telephoto position is ΔZ3. W-T The total optical length of the lens body is TTL, and 9. The zoom lens according to claim 1, characterized in that, The lens body also includes an aperture stop disposed in the cavity, the aperture stop being located between the second lens group and the third lens group, wherein the distance from the aperture stop to the image plane of the lens body is Ls to IMG, and the total optical length of the lens body is TTL. And / or, The lens body further includes a beam-splitting element disposed in the cavity, the beam-splitting element being located behind the sixth lens group; and / or, The lens body also includes a photosensitive chip disposed in the cavity, and the photosensitive chip is located on the rear side of the sixth lens group.

10. An imaging device, characterized in that, Includes the zoom lens as described in any one of claims 1 to 9.

Images