zoom lens

Abstract

This application discloses a zoom lens, which includes, along the optical axis from the object side to the image plane, the following elements in sequence: a first lens group having positive optical power; a second lens group having negative optical power; a third lens group having negative optical power; a fourth lens group having positive optical power; a fifth lens group having negative optical power; a sixth lens group having positive optical power; and a seventh lens group having either positive or negative optical power; wherein the positions of the first, fourth, and seventh lens groups relative to the image plane are fixed, and the distances of the second, third, fifth, and sixth lens groups relative to the image plane along the optical axis are adjustable.

Description

Technical Field

[0001] This application relates to the field of optical devices, specifically to a zoom lens. Background Technology

[0002] With the rapid development of technology, zoom lenses are widely used in security monitoring, intelligent transportation and other fields. As a result, higher requirements are put forward for zoom lenses. For example, zoom lenses need to focus clearly during the zooming process and have characteristics such as large target area, wide working distance range, high resolution, miniaturization and clear image.

[0003] However, traditional zoom lenses have many problems. For example, zoom lenses cannot achieve fast focusing and cannot produce clear images; the range of adjustable focal lengths is small, the target surface is small, and the working distance range is narrow; the overall optical length of zoom lenses is relatively long, which cannot meet the requirements of miniaturization. Summary of the Invention

[0004] This application provides a zoom lens that can solve at least one or more problems existing in the prior art.

[0005] One aspect of this application provides a zoom lens comprising, along the optical axis from the object side to the image plane, the following elements in sequence: a first lens group having positive optical power; a second lens group having negative optical power; a third lens group having negative optical power; a fourth lens group having positive optical power; a fifth lens group having negative optical power; a sixth lens group having positive optical power; and a seventh lens group having either positive or negative optical power; wherein the positions of the first, fourth, and seventh lens groups relative to the image plane are fixed, and the distances of the second, third, fifth, and sixth lens groups relative to the image plane along the optical axis are adjustable.

[0006] According to an exemplary embodiment of this application, the first lens group includes at least three positive lenses and at least one negative lens, and the at least one positive lens in the first lens group is configured as a biconvex lens.

[0007] According to an exemplary embodiment of this application, the second lens group includes a positive lens and a negative lens, and the negative lens in the second lens group is configured as a biconcave lens.

[0008] According to an exemplary embodiment of this application, the third lens group includes a positive lens and three negative lenses, and at least two of the negative lenses in the third lens group are configured as biconcave lenses.

[0009] According to an exemplary embodiment of this application, the fourth lens group includes at least one negative lens and at least three positive lenses, and at least one positive lens in the fourth lens group is configured as a biconvex lens, and at least two lenses in the fourth lens group are configured as convex-concave lenses.

[0010] According to an exemplary embodiment of this application, the fifth lens group includes a positive lens and two negative lenses, and the positive lens in the fifth lens group is configured as a biconvex lens, and at least one negative lens in the fifth lens group is configured as a biconcave lens.

[0011] According to an exemplary embodiment of this application, the sixth lens group includes at least two positive lenses and at least one negative lens, wherein at least one positive lens in the sixth lens group is configured as a biconvex lens and at least one negative lens in the sixth lens group is configured as a biconcave lens.

[0012] According to one exemplary embodiment of this application, the zoom lens includes at least five cemented lenses.

[0013] According to an exemplary embodiment of this application, the zoom lens also satisfies: 5.08 ≤ F T / F W ≤5.92, where F T F is the focal length at the telephoto end of a zoom lens. W This refers to the short focal length of a zoom lens.

[0014] According to an exemplary embodiment of this application, the zoom lens also satisfies: 0.15 ≤ F W / TTL≤0.20,0.90≤F T / TTL≤1.02, where F T F is the focal length at the telephoto end of a zoom lens. W TTL is the focal length at the short focal length end of the zoom lens, and TTL is the total optical length of the zoom lens.

[0015] According to an exemplary embodiment of this application, the zoom lens also satisfies: 0.32 ≤ T G4 / F G4 ≤0.72, where T G4 F is the total optical length of the fourth lens group. G4 This is the focal length of the fourth lens group.

[0016] According to an exemplary embodiment of this application, the zoom lens also satisfies: 9.64≤TTL / H≤10.47, where TTL is the total optical length of the zoom lens and H is the diameter of the imaging target surface of the zoom lens.

[0017] According to an exemplary embodiment of this application, the zoom lens also satisfies: 0.87 ≤ F G4 / F W ≤1.51, where F G4 F is the focal length of the fourth lens group. W This refers to the short focal length of a zoom lens.

[0018] According to an exemplary embodiment of this application, the zoom lens also satisfies: 2.08 ≤ F T / F G1 ≤2.33, where F T F is the focal length at the telephoto end of a zoom lens. G1 is the focal length of the first lens group.

[0019] According to an exemplary embodiment of this application, the zoom lens also satisfies: 0.24 ≤ Δ L3 / TTL≤0.30, where Δ L3 TTL represents the maximum travel distance of the third lens group and the total optical length of the zoom lens.

[0020] According to an exemplary embodiment of this application, the zoom lens also satisfies: 0.05 ≤ Δ L6 / TTL≤0.13, where Δ L6 TTL is the maximum travel distance of the sixth lens group and the total optical length of the zoom lens.

[0021] According to an exemplary embodiment of this application, the zoom lens also satisfies: 0.93 ≤ 2F T ×tan(FOV_ T / 2) / H≤0.98, where F T FOV is the focal length at the telephoto end of a zoom lens. T H is the field of view at the telephoto end of the zoom lens, and H is the diameter of the imaging target surface of the zoom lens.

[0022] According to an exemplary embodiment of this application, the zoom lens also satisfies: -1.29 ≤ R 53 / F G53 ≤-0.52, where R 53 Let F be the radius of curvature of the image-side surface of the third lens in the fifth lens group. G53 This is the focal length of the third lens in the fifth lens group.

[0023] According to an exemplary embodiment of this application, the first lens group includes at least one cemented lens, and the zoom lens further satisfies: 0.33 ≤ T 11 / T G1 ≤0.61, where T 11 T represents the center thickness of the first cemented lens in the first lens group along the optical axis. G1 This is the total optical length of the first lens group.

[0024] According to an exemplary embodiment of this application, the zoom lens also satisfies: -7.05 ≤ F G2 / F W ≤-4.50 where, F G2F is the focal length of the second lens group. W This refers to the short focal length of a zoom lens.

[0025] According to an exemplary embodiment of this application, the zoom lens also satisfies: -21.69 ≤ F G7 / F W ≤5.72, where F G7 F is the focal length of the seventh lens group. W This refers to the short focal length of a zoom lens.

[0026] According to an exemplary embodiment of this application, the zoom lens also satisfies: 0.01≤BFL / TTL≤0.07, where BFL is the back focal length of the zoom lens and TTL is the total optical length of the zoom lens.

[0027] The zoom lens provided in this application is configured with a seven-lens structure. By adjusting the positions of the third, fifth, and sixth lens groups on the optical axis, the focal length of the zoom lens can be varied within the range of 48mm to 250mm. Simultaneously, by adjusting the position of the second lens group on the optical axis, rapid focusing is possible at object distances ranging from 2m to infinity, ensuring clear imaging at all focal lengths. Furthermore, by combining appropriate optical powers of each lens group, the zoom lens can achieve at least one of the following beneficial effects: large target area, wide working distance range, high resolution, miniaturization, and clear image. Attached Figure Description

[0028] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0029] Figure 1 A schematic diagram of the short focal length end of a zoom lens according to Embodiment 1 of this application is shown;

[0030] Figures 2A to 2C RAY FAN diagram, field curvature and distortion diagram, and axial chromatic aberration diagram of the short focal length end of the zoom lens according to Embodiment 1 of this application are shown respectively.

[0031] Figure 3 A schematic diagram of the telephoto end of a zoom lens according to Embodiment 1 of this application is shown;

[0032] Figures 4A to 4C The RAY FAN diagram, field curvature and distortion diagram, and axial chromatic aberration diagram of the telephoto end of the zoom lens according to Embodiment 1 of this application are shown respectively.

[0033] Figure 5 A schematic diagram of the short focal length end of a zoom lens according to Embodiment 2 of this application is shown;

[0034] Figures 6A to 6C RAY FAN diagram, field curvature and distortion diagram, and axial chromatic aberration diagram of the short focal length end of the zoom lens according to Embodiment 2 of this application are shown respectively.

[0035] Figure 7 A schematic diagram of the telephoto end of a zoom lens according to Embodiment 2 of this application is shown;

[0036] Figures 8A to 8C RAY FAN diagram, field curvature and distortion diagram, and axial chromatic aberration diagram of the telephoto end of the zoom lens according to Embodiment 2 of this application are shown respectively.

[0037] Figure 9 A schematic diagram of the short focal length end of a zoom lens according to Embodiment 3 of this application is shown;

[0038] Figures 10A to 10C RAY FAN diagram, field curvature and distortion diagram, and axial chromatic aberration diagram of the short focal length end of the zoom lens according to Embodiment 3 of this application are shown respectively.

[0039] Figure 11 A schematic diagram of the telephoto end of a zoom lens according to Embodiment 3 of this application is shown;

[0040] Figures 12A to 12C RAY FAN diagram, field curvature and distortion diagram, and axial chromatic aberration diagram of the telephoto end of the zoom lens according to Embodiment 3 of this application are shown respectively.

[0041] Figure 13 A schematic diagram of the short focal length end of a zoom lens according to Embodiment 4 of this application is shown;

[0042] Figures 14A to 14C RAY FAN diagram, field curvature and distortion diagram, and axial chromatic aberration diagram of the short focal length end of the zoom lens according to Embodiment 4 of this application are shown respectively.

[0043] Figure 15 A schematic diagram of the telephoto end of a zoom lens according to Embodiment 4 of this application is shown; and

[0044] Figures 16A to 16C The RAY FAN diagram, field curvature and distortion diagram, and axial chromatic aberration diagram of the telephoto end of the zoom lens according to Embodiment 4 of this application are shown respectively. Detailed Implementation

[0045] To better understand this application, various aspects of this application will be described in detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely descriptions of exemplary embodiments of this application and are not intended to limit the scope of this application in any way.

[0046] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not drawn strictly to scale.

[0047] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0048] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprises" as used in this specification indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. It should be noted that in this specification, the expressions "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features.

[0049] Unless otherwise specified, all terms used herein shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. Terms shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formal sense unless expressly stated herein.

[0050] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0051] A zoom lens according to an exemplary embodiment of this application may include a first lens group having positive optical power, a second lens group having negative optical power, a third lens group having negative optical power, a fourth lens group having positive optical power, a fifth lens group having negative optical power, a sixth lens group having positive optical power, and a seventh lens group having either positive or negative optical power. These seven lens groups are arranged sequentially along the optical axis from the object side to the image plane. Air gaps may exist between adjacent lens groups from the first to the seventh lens group.

[0052] In an exemplary embodiment, the position of the first lens group relative to the image plane is fixed. The first lens group may include at least three positive lenses and at least one negative lens, and the at least one positive lens in the first lens group is configured as a biconvex lens. Properly configuring the optical power and shape of each lens in the first lens group can reduce chromatic aberration produced by each lens, lower the tolerance sensitivity of each lens, and also facilitate achieving low distortion in the zoom lens.

[0053] In an exemplary embodiment, the second lens group is movable relative to the image plane along the optical axis, meaning its position relative to the image plane on the optical axis is adjustable. The second lens group is a focusing lens group. When the object distance varies from 2m to infinity, focusing is achieved by moving the second lens group, ensuring clear imaging by the zoom lens. The second lens group may include one positive lens and one negative lens, and the negative lens in the second lens group is configured as a biconcave lens. Using a smaller number of lenses to compose the second lens group reduces its weight, while the optical power and shape of each lens in the second lens group are rationally configured to balance the astigmatism produced by other lens groups, thereby improving the optical performance of the zoom lens.

[0054] In an exemplary embodiment, the third lens group is movable relative to the image plane along the optical axis, meaning its position relative to the image plane on the optical axis is adjustable. The third lens group is a zoom lens group. It may include one positive lens and three negative lenses, with at least two of the negative lenses configured as biconcave lenses. Properly configuring the optical power and shape of each lens in the third lens group can reduce the incident height of the axial beam, allowing light to pass smoothly through the third lens group, which is beneficial for achieving high resolution in a zoom lens.

[0055] In an exemplary embodiment, the fourth lens group is fixed in position relative to the image plane. The fourth lens group may include at least one negative lens and at least three positive lenses, wherein at least one positive lens in the fourth lens group is configured as a biconvex lens, and at least two lenses in the fourth lens group are configured as convex-concave lenses. By rationally configuring the optical power and shape of each lens in the fourth lens group, light can converge rapidly, reducing the maximum optical aperture of the fourth lens group, which is beneficial for miniaturizing zoom lenses and reducing the tolerance sensitivity of zoom lenses.

[0056] In an exemplary embodiment, the fifth lens group is movable relative to the image plane along the optical axis, meaning its position relative to the image plane on the optical axis is adjustable. The fifth lens group is a zoom lens group. It may include one positive lens and two negative lenses, with the positive lens configured as a biconvex lens and at least one negative lens configured as a biconcave lens. Properly configuring the optical power and shape of each lens in the fifth lens group can effectively balance chromatic aberration at different focal lengths, which is beneficial for achieving high resolution in zoom lenses.

[0057] In an exemplary embodiment, the sixth lens group is movable relative to the image plane along the optical axis, meaning its position relative to the image plane on the optical axis is adjustable. The sixth lens group is a zoom lens group. It may include at least two positive lenses and at least one negative lens, wherein at least one positive lens is configured as a biconvex lens, and at least one negative lens is configured as a biconcave lens. Properly configuring the optical power and shape of each lens in the sixth lens group allows light to pass through the group smoothly, thereby reducing the tolerance sensitivity of the zoom lens.

[0058] In an exemplary embodiment, the position of the seventh lens group relative to the image plane is fixed.

[0059] This application enables the zoom lens to change its focal length by adjusting the position of the zoom lens groups (i.e., the third, fifth, and sixth lens groups) on the optical axis. For example, the focal length of the zoom lens can vary within the range of 48mm to 250mm. Simultaneously, by adjusting the position of the focusing lens group (i.e., the second lens group) on the optical axis, it ensures that the zoom lens can produce clear images at different object distances and focal lengths. Furthermore, by combining appropriate optical power of each lens group, the zoom lens can achieve at least one of the following beneficial effects: large target area, wide working distance range, high resolution, miniaturization, and clear image. During the zooming process, the focal length ends of the zoom lens can be categorized into short focal length, medium focal length, and long focal length.

[0060] In an exemplary embodiment, the zoom lens may include at least five cemented lenses. By including at least five cemented lenses in the zoom lens, aberrations caused by the lenses can be reduced, improving the resolving power of the zoom lens; the tolerance sensitivity of the lenses can also be reduced, improving the assembly yield of the zoom lens; and the structure between the lenses can be made more compact, which is beneficial for miniaturizing the zoom lens.

[0061] In an exemplary embodiment, the zoom lens may also satisfy: 5.08 ≤ F T / F W ≤5.92, where F T F is the focal length at the telephoto end of a zoom lens. W This refers to the short focal length of a zoom lens. Properly configuring the ratio of the telephoto to the short focal length of a zoom lens helps achieve a zoom ratio of approximately 5x or more.

[0062] In an exemplary embodiment, the zoom lens may also satisfy: 0.15 ≤ F W / TTL≤0.20,0.90≤F T / TTL≤1.02, where F T F is the focal length at the telephoto end of a zoom lens.W Here, TTL represents the focal length at the short focal length end of the zoom lens, and TTL represents the total optical length of the zoom lens. Properly configuring the ratios of the focal length at the long focal length end, the focal length at the short focal length end, and the total optical length of the zoom lens is beneficial for miniaturizing the zoom lens.

[0063] In an exemplary embodiment, the zoom lens may also satisfy: 0.32 ≤ T G4 / F G4 ≤0.72, where T G4 F is the total optical length of the fourth lens group. G4 This refers to the focal length of the fourth lens group. By rationally configuring the ratio of the total optical length of the fourth lens group to its focal length, the fourth lens group can be made to have a smaller size, thus facilitating the miniaturization of zoom lenses.

[0064] In an exemplary embodiment, the zoom lens may also satisfy the following ratio: 9.64 ≤ TTL / H ≤ 10.47, where TTL is the total optical length of the zoom lens and H is the diameter of the imaging target surface of the zoom lens. If the ratio of the total optical length to the imaging target surface diameter of the zoom lens is too small, the aberration balance at the telephoto end of the zoom lens will be limited, resulting in poor resolution. Conversely, if the ratio is too large, the size of the zoom lens increases, zoom efficiency decreases, and its cost increases. Reasonably configuring the ratio of the total optical length to the imaging target surface diameter of the zoom lens can improve its resolution and reduce its cost.

[0065] In an exemplary embodiment, the zoom lens may also satisfy: 0.87 ≤ F G4 / F W ≤1.51, where F G4 F is the focal length of the fourth lens group. W This refers to the focal length at the short focal length end of the zoom lens. If the ratio of the focal length of the fourth lens group to the short focal length end of the zoom lens is too small, the tolerance sensitivity of the fourth lens group will be high, and the resolving consistency of the zoom lens will deteriorate. Conversely, if the ratio is too large, the size of the zoom lens will increase, hindering miniaturization. Therefore, a properly configured ratio of the focal length of the fourth lens group to the short focal length end of the zoom lens helps reduce the tolerance sensitivity of the fourth lens group and achieves miniaturization of the zoom lens.

[0066] In an exemplary embodiment, the zoom lens may also satisfy: 2.08 ≤ F T / F G1 ≤2.33, where F T F is the focal length at the telephoto end of a zoom lens. G1This refers to the focal length of the first lens group. Properly configuring the ratio of the focal length at the telephoto end of the zoom lens to the focal length of the first lens group helps balance various aberrations at the telephoto end of the zoom lens and improves its resolving power.

[0067] In an exemplary embodiment, the zoom lens may also satisfy: 0.24 ≤ Δ L3 / TTL≤0.30, where Δ L3 TTL represents the maximum travel distance of the third lens group and the total optical length of the zoom lens. Properly configuring the maximum travel distance of the third lens group can improve the zoom response of the zoom lens, thereby enhancing its zoom sensitivity.

[0068] In an exemplary embodiment, the zoom lens may also satisfy: 0.05 ≤ Δ L6 / TTL≤0.13, where Δ L6 TTL represents the maximum travel distance of the sixth lens group, and TTL represents the total optical length of the zoom lens. Properly configuring the maximum travel distance of the sixth lens group can improve the zoom response of the zoom lens, thereby increasing its zoom sensitivity and balancing image quality at different focal lengths.

[0069] In an exemplary embodiment, the zoom lens may also satisfy: 0.93 ≤ 2F T ×tan(FOV_ T / 2) / H≤0.98, where F T FOV is the focal length at the telephoto end of a zoom lens. T Let H be the field of view at the telephoto end of the zoom lens, and H be the diameter of the imaging target surface of the zoom lens. Properly configuring the focal length and field of view at the telephoto end of the zoom lens can make the actual image height closer to the ideal image height, which is beneficial for achieving low distortion in the zoom lens.

[0070] In an exemplary embodiment, the zoom lens may also satisfy: -1.29 ≤ R 53 / F G53 ≤-0.52, where R 53 Let F be the radius of curvature of the image-side surface of the third lens in the fifth lens group. G53 This refers to the focal length of the third lens in the fifth lens group. By appropriately configuring the ratio of the radius of curvature of the image-side surface of the third lens in the fifth lens group to its focal length, light can diverge smoothly at that lens, which helps to elevate the light rays and thus achieve a large target surface for the zoom lens.

[0071] In an exemplary embodiment, the first lens group may include at least one cemented lens, and the zoom lens may also satisfy: 0.33 ≤ T 11 / T G1 ≤0.61, where T11 T represents the center thickness of the first cemented lens in the first lens group along the optical axis. G1 This refers to the total optical length of the first lens group. By rationally configuring the ratio of the center thickness of the first cemented lens on the optical axis to the total optical length of the first lens group, chromatic aberration of the first lens group can be reduced, and the overall performance of the zoom lens can be improved, achieving high resolution.

[0072] In an exemplary embodiment, the zoom lens may also satisfy: -7.05 ≤ F G2 / F W ≤-4.50 where, F G2 F is the focal length of the second lens group. W This refers to the short focal length of the zoom lens. Properly configuring the ratio of the focal length of the second lens group to the short focal length of the zoom lens helps correct various aberrations in the second lens group, while also reducing the tolerance sensitivity of the second lens group and improving the assembly yield of the zoom lens.

[0073] In an exemplary embodiment, the zoom lens may also satisfy: -21.69 ≤ F G7 / F W ≤5.72, where F G7 F is the focal length of the seventh lens group. W This refers to the short focal length of the zoom lens. Properly configuring the ratio of the focal length of the seventh lens group to the short focal length of the zoom lens helps correct off-axis aberrations and achieve high resolution. It also corrects distortion, ensuring minimal image distortion in the zoom lens's image.

[0074] In an exemplary embodiment, the zoom lens may also satisfy the following ratio: 0.01 ≤ BFL / TTL ≤ 0.07, where BFL is the back focal length of the zoom lens and TTL is the total optical length of the zoom lens. Properly configuring the ratio of the back focal length to the total optical length of the zoom lens ensures sufficient back focal margin, reduces the assembly sensitivity of the zoom lens, facilitates meeting the assembly requirements of the zoom lens, and improves the assembly yield of the zoom lens.

[0075] In an exemplary embodiment, the zoom lens may further include an aperture stop, which may be disposed between two adjacent lenses in the fourth lens group.

[0076] The zoom lens provided in this application is configured with a seven-lens-group structure. By moving the zoom lens group and the focusing lens group, the focal length of the zoom lens can be varied within the range of 48mm to 250mm. Simultaneously, by optimizing the optical power of each lens group and the optical power and shape of the lenses in each lens group, at least one of the following characteristics is achieved: low distortion, high resolution, miniaturization, large image size, and clear image. The zoom lens has excellent resolution, reaching 8K or higher. The zoom lens has a small size, with its total optical length, for example, less than or equal to 265mm. The distortion value of the zoom lens is less than 8% throughout the zoom range to ensure minimal image distortion. The maximum image height of the zoom lens can be, for example, 25.6mm. This application also ensures clear imaging when the object distance varies from 2m to infinity by moving the focusing lens group.

[0077] However, those skilled in the art should understand that, without departing from the technical solutions claimed in this application, the lens group constituting the zoom lens and / or the number of lenses contained in the lens group can be changed to obtain the various results and advantages described in this specification.

[0078] The following describes in further detail, with reference to the accompanying drawings, specific embodiments of the zoom lens applicable to the above-described embodiments.

[0079] Example 1

[0080] The following is for reference Figures 1 to 4C A zoom lens according to Embodiment 1 of this application is described. Figure 1 This is a schematic diagram of the short focal length end of the zoom lens according to Embodiment 1 of this application; Figure 3 This is a schematic diagram of the telephoto end of a zoom lens according to Embodiment 1 of this application.

[0081] like Figure 1 and Figure 3 As shown, the zoom lens 100 includes, along the optical axis from the object side to the image plane IMA, the following elements in sequence: a first lens group G1 with positive optical power, a second lens group G2 with negative optical power, a third lens group G3 with negative optical power, a fourth lens group G4 with positive optical power, a fifth lens group G5 with negative optical power, a sixth lens group G6 with positive optical power, and a seventh lens group G7 with negative optical power.

[0082] The first lens group G1 includes a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4. The first lens L1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens L2 has negative optical power, with its object-side surface S3 being convex and its image-side surface concave. The third lens L3 has positive optical power, with its object-side surface S4 being convex and its image-side surface S5 being convex. The fourth lens L4 has positive optical power, with its object-side surface S6 being convex and its image-side surface S7 being concave. The second lens L2 and the third lens L3 are cemented together to form a cemented lens.

[0083] The second lens group G2 includes a fifth lens L5 and a sixth lens L6. The fifth lens L5 can have positive optical power, with both its object-side surface S8 and image-side surface being convex. The sixth lens L6 can have negative optical power, with both its object-side surface S9 and image-side surface S10 being concave. The fifth lens L5 and the sixth lens L6 are cemented together to form a cemented lens.

[0084] The third lens group G3 includes a seventh lens L7, an eighth lens L8, a ninth lens L9, and a tenth lens L10. The seventh lens L7 can have negative optical power; its object-side face S11 is convex, and its image-side face S12 is concave. The eighth lens L8 can have negative optical power; its object-side face S13 is concave, and its image-side face is concave. The ninth lens L9 can have positive optical power; its object-side face S14 is convex, and its image-side face S15 is convex. The tenth lens L10 can have negative optical power; its object-side face S16 is concave, and its image-side face S17 is concave. The eighth lens L8 and the ninth lens L9 are cemented together to form a cemented lens.

[0085] The fourth lens group G4 includes the eleventh lens L11, the twelfth lens L12, the thirteenth lens L13, the fourteenth lens L14, the fifteenth lens L15, the sixteenth lens L16, the seventeenth lens L17, and the eighteenth lens L18. The eleventh lens L11 has positive optical power, with its object-side surface S18 being convex and its image-side surface S19 being convex. The twelfth lens L12 has negative optical power, with its object-side surface S20 being convex and its image-side surface being concave. The thirteenth lens L13 has positive optical power, with its object-side surface S21 being convex and its image-side surface S22 being convex. The fourteenth lens L14 has positive optical power, with its object-side surface S23 being concave and its image-side surface being convex. The fifteenth lens L15 has negative optical power, with its object-side surface S24 being concave and its image-side surface being concave. The sixteenth lens L16 has positive optical power, with its object-side surface S25 being convex and its image-side surface S26 being convex. The seventeenth lens L17 can have positive optical power, with its object-side surface S27 being convex and its image-side surface being concave. The eighteenth lens L18 can have negative optical power, with its object-side surface S28 being convex and its image-side surface S29 being concave. The twelfth lens L12 and the thirteenth lens L13 are cemented together to form a cemented lens; the fourteenth lens L14, the fifteenth lens L15, and the sixteenth lens L16 are cemented together to form a cemented lens; and the seventeenth lens L17 and the eighteenth lens L18 are cemented together to form a cemented lens. The aperture stop STO can be positioned between the thirteenth lens L13 and the fourteenth lens L14.

[0086] The fifth lens group G5 includes the nineteenth lens L19, the twentieth lens L20, and the twenty-first lens L21. The nineteenth lens L19 can have positive optical power, with its object-side surface S30 being convex and its image-side surface S31 being convex. The twentieth lens L20 can have negative optical power, with its object-side surface S32 being concave and its image-side surface S33 being concave. The twenty-first lens L21 can have negative optical power, with its object-side surface S34 being concave and its image-side surface S35 being concave.

[0087] The sixth lens group G6 includes the twenty-second lens L22, the twenty-third lens L23, the twenty-fourth lens L24, the twenty-fifth lens L25, and the twenty-sixth lens L26. The twenty-second lens L22 has positive optical power, with a convex object-side surface S36 and a convex image-side surface S37. The twenty-third lens L23 has negative optical power, with a convex object-side surface S38 and a concave image-side surface. The twenty-fourth lens L24 has positive optical power, with a convex object-side surface S39 and a convex image-side surface S40. The twenty-fifth lens L25 has negative optical power, with a concave object-side surface S41 and a concave image-side surface. The twenty-sixth lens L26 has positive optical power, with a convex object-side surface S42 and a convex image-side surface S43. The twenty-third lens L23 and the twenty-fourth lens L24 are cemented together to form a cemented lens, and the twenty-fifth lens L25 and the twenty-sixth lens L26 are cemented together to form another cemented lens.

[0088] The seventh lens group G7 includes the twenty-seventh lens L27 and the twenty-eighth lens L28. The twenty-seventh lens L27 can have negative optical power, with its object-side surface S44 being concave and its image-side surface being concave. The twenty-eighth lens L28 can have positive optical power, with its object-side surface S45 being convex and its image-side surface S46 being convex. The twenty-seventh lens L27 and the twenty-eighth lens L28 are cemented together to form a cemented lens.

[0089] Light from the object passes through surfaces S1 to S46 in sequence and is finally imaged onto the imaging surface IMA.

[0090] Table 1 shows the basic parameters of the zoom lens 100 of Embodiment 1, wherein the units for radius of curvature, thickness / distance and focal length are millimeters (mm).

[0091]

[0092]

[0093] Table 1

[0094] In this embodiment, at each focal length end, the focal length of the zoom lens and the air spacing of adjacent lens groups on the optical axis are shown in Table 2. Wherein, D1 is the air spacing of the first and second lens groups on the optical axis; D2 is the air spacing of the second and third lens groups on the optical axis; D3 is the air spacing of the third and fourth lens groups on the optical axis; D4 is the air spacing of the fourth and fifth lens groups on the optical axis; D5 is the air spacing of the fifth and sixth lens groups on the optical axis; and D6 is the air spacing of the sixth and seventh lens groups on the optical axis.

[0095]

[0096]

[0097] Table 2

[0098] Figures 2A to 2C The RAY FAN diagram, field curvature and distortion diagram, and axial chromatic aberration diagram of the short focal length of the zoom lens 100 are shown respectively. Figures 4A to 4C The RAY FAN diagram, field curvature and distortion diagram, and axial chromatic aberration diagram of the telephoto end of the zoom lens 100 are shown respectively. Therefore, according to Figures 2A to 2C as well as Figures 4A to 4C It can be seen that the zoom lens 100 given in Example 1 can achieve good imaging quality at different focal lengths.

[0099] Example 2

[0100] The following is for reference Figures 5 to 8CA zoom lens according to Embodiment 2 of this application is described. Figure 5 This is a schematic diagram of the short focal length end of the zoom lens according to Embodiment 2 of this application; Figure 7 This is a schematic diagram of the telephoto end of a zoom lens according to Embodiment 2 of this application.

[0101] like Figure 5 and Figure 7 As shown, the zoom lens 200 includes, along the optical axis from the object side to the image plane IMA, the following elements in sequence: a first lens group G1 with positive optical power, a second lens group G2 with negative optical power, a third lens group G3 with negative optical power, a fourth lens group G4 with positive optical power, a fifth lens group G5 with negative optical power, a sixth lens group G6 with positive optical power, and a seventh lens group G7 with negative optical power.

[0102] The first lens group G1 includes a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4. The first lens L1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being convex. The second lens L2 has positive optical power, with its object-side surface S3 being convex and its image-side surface being convex. The third lens L3 has negative optical power, with its object-side surface S4 being concave and its image-side surface S5 being concave. The fourth lens L4 has positive optical power, with its object-side surface S6 being convex and its image-side surface S7 being convex. The second lens L2 and the third lens L3 are cemented together to form a cemented lens.

[0103] The second lens group G2 includes a fifth lens L5 and a sixth lens L6. The fifth lens L5 can have positive optical power, with its object-side surface S8 being concave and its image-side surface S9 being convex. The sixth lens L6 can have negative optical power, with its object-side surface S10 being concave and its image-side surface S11 being concave.

[0104] The third lens group G3 includes a seventh lens L7, an eighth lens L8, a ninth lens L9, and a tenth lens L10. The seventh lens L7 can have negative optical power, with its object-side surface S12 being concave and its image-side surface S13 being concave. The eighth lens L8 can have positive optical power, with its object-side surface S14 being convex and its image-side surface being convex. The ninth lens L9 can have negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being concave. The tenth lens L10 can have negative optical power, with its object-side surface S17 being concave and its image-side surface S18 being concave. The eighth lens L8 and the ninth lens L9 are cemented together to form a cemented lens.

[0105] The fourth lens group G4 includes an eleventh lens L11, a twelfth lens L12, a thirteenth lens L13, and a fourteenth lens L14. The eleventh lens L11 can have positive optical power, with its object-side surface S19 being convex and its image-side surface S20 being convex. The twelfth lens L12 can have negative optical power, with its object-side surface S21 being convex and its image-side surface being concave. The thirteenth lens L13 can have positive optical power, with its object-side surface S22 being convex and its image-side surface S23 being concave. The fourteenth lens L14 can have positive optical power, with its object-side surface S24 being convex and its image-side surface S25 being convex. The twelfth lens L12 and the thirteenth lens L13 are cemented together to form a cemented lens. An aperture stop STO can be positioned between the eleventh lens L11 and the twelfth lens L12.

[0106] The fifth lens group G5 includes the fifteenth lens L15, the sixteenth lens L16, and the seventeenth lens L17. The fifteenth lens L15 can have positive optical power, with its object-side surface S26 being convex and its image-side surface S27 being convex. The sixteenth lens L16 can have negative optical power, with its object-side surface S28 being concave and its image-side surface S29 being concave. The seventeenth lens L17 can have negative optical power, with its object-side surface S30 being concave and its image-side surface S31 being concave.

[0107] The sixth lens group G6 includes the eighteenth lens L18, the nineteenth lens L19, the twentieth lens L20, the twenty-first lens L21, and the twenty-second lens L22. The eighteenth lens L18 has positive optical power, with both its object-side surface S32 and image-side surface being convex. The nineteenth lens L19 has negative optical power, with both its object-side surface S33 and image-side surface being concave. The twentieth lens L20 has positive optical power, with both its object-side surface S34 and image-side surface S35 being convex. The twenty-first lens L21 has negative optical power, with both its object-side surface S36 and image-side surface being concave. The twenty-second lens L22 has positive optical power, with both its object-side surface S37 and image-side surface S38 being convex. The eighteenth lens L18, the nineteenth lens L19, and the twentieth lens L20 are cemented together to form a cemented lens, and the twenty-first lens L21 and the twenty-second lens L22 are cemented together to form another cemented lens.

[0108] The seventh lens group G7 includes the twenty-third lens L23. The twenty-third lens L23 can have negative optical power, and its object side S39 is concave and its image side S40 is convex.

[0109] Light from the object passes through each surface S1 to S40 in sequence and is finally imaged on the imaging surface IMA.

[0110] Table 3 shows the basic parameters of the zoom lens 200 of Embodiment 2, wherein the units for radius of curvature, thickness / distance and focal length are millimeters (mm).

[0111]

[0112]

[0113] Table 3

[0114] In this embodiment, at each focal length end, the focal length of the zoom lens and the air spacing of adjacent lens groups on the optical axis are shown in Table 4. Wherein, D1 is the air spacing of the first and second lens groups on the optical axis; D2 is the air spacing of the second and third lens groups on the optical axis; D3 is the air spacing of the third and fourth lens groups on the optical axis; D4 is the air spacing of the fourth and fifth lens groups on the optical axis; D5 is the air spacing of the fifth and sixth lens groups on the optical axis; and D6 is the air spacing of the sixth and seventh lens groups on the optical axis.

[0115] Short focal length end Middle coke end telephoto end focal length 43.219 108.047 250.672 OBJ INF INF INF D1 0.100 0.203 0.082 D2 14.906 60.269 82.491 D3 68.245 22.779 0.678 D4 0.267 2.308 36.617 D5 24.404 15.917 7.985 D6 21.990 28.436 2.059

[0116] Table 4

[0117] Figures 6A to 6C The RAY FAN diagram, field curvature and distortion diagram, and axial chromatic aberration diagram of the short focal length of zoom lens 200 are shown respectively. Figures 8A to 8C The RAY FAN diagram, field curvature and distortion diagram, and axial chromatic aberration diagram of the telephoto end of zoom lens 200 are shown respectively. Therefore, according to Figures 6A to 6C as well as Figures 8A to 8C It can be seen that the zoom lens 200 given in Example 2 can achieve good imaging quality at different focal lengths.

[0118] Example 3

[0119] The following is for reference Figures 9 to 12C A zoom lens according to Embodiment 3 of this application is described. Figure 9 This is a schematic diagram of the short focal length end of the zoom lens according to Embodiment 3 of this application; Figure 11 This is a schematic diagram of the telephoto end of the zoom lens according to Embodiment 3 of this application.

[0120] like Figure 9 and Figure 11 As shown, the zoom lens 300 includes, along the optical axis from the object side to the image plane IMA, the following elements in sequence: a first lens group G1 with positive optical power, a second lens group G2 with negative optical power, a third lens group G3 with negative optical power, a fourth lens group G4 with positive optical power, a fifth lens group G5 with negative optical power, a sixth lens group G6 with positive optical power, and a seventh lens group G7 with negative optical power.

[0121] The first lens group G1 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5. The first lens L1 has positive optical power, with both its object-side surface S1 and image-side surface being convex. The second lens L2 has negative optical power, with both its object-side surface S2 and image-side surface S3 being convex. The third lens L3 has positive optical power, with both its object-side surface S4 and image-side surface being convex. The fourth lens L4 has negative optical power, with both its object-side surface S5 and image-side surface S6 being concave. The fifth lens L5 has positive optical power, with both its object-side surface S7 and image-side surface S8 being concave. The first lens L1 and the second lens L2 are cemented together to form a cemented lens, and the third lens L3 and the fourth lens L4 are cemented together to form another cemented lens.

[0122] The second lens group G2 includes a sixth lens L6 and a seventh lens L7. The sixth lens L6 can have positive optical power, with its object-side surface S9 being concave and its image-side surface being convex. The seventh lens L7 can have negative optical power, with its object-side surface S10 being concave and its image-side surface S11 being concave. The sixth lens L6 and the seventh lens L7 are cemented together to form a cemented lens.

[0123] The third lens group G3 includes the eighth lens L8, the ninth lens L9, the tenth lens L10, and the eleventh lens L11. The eighth lens L8 can have negative optical power, with its object-side surface S12 being concave and its image-side surface S13 being concave. The ninth lens L9 can have negative optical power, with its object-side surface S14 being concave and its image-side surface being concave. The tenth lens L10 can have positive optical power, with its object-side surface S15 being convex and its image-side surface S16 being convex. The eleventh lens L11 can have negative optical power, with its object-side surface S17 being concave and its image-side surface S18 being concave. The ninth lens L9 and the tenth lens L10 are cemented together to form a cemented lens.

[0124] The fourth lens group G4 includes a twelfth lens L12, a thirteenth lens L13, a fourteenth lens L14, and a fifteenth lens L15. The twelfth lens L12 can have positive optical power, with its object-side surface S19 being convex and its image-side surface S20 being convex. The thirteenth lens L13 can have negative optical power, with its object-side surface S21 being convex and its image-side surface being concave. The fourteenth lens L14 can have positive optical power, with its object-side surface S22 being convex and its image-side surface S23 being convex. The fifteenth lens L15 can have positive optical power, with its object-side surface S24 being convex and its image-side surface S25 being concave. The thirteenth lens L13 and the fourteenth lens L14 are cemented together to form a cemented lens. An aperture stop STO can be positioned between the twelfth lens L12 and the thirteenth lens L13.

[0125] The fifth lens group G5 includes the sixteenth lens L16, the seventeenth lens L17, and the eighteenth lens L18. The sixteenth lens L16 can have positive optical power, with its object-side surface S26 being convex and its image-side surface S27 being convex. The seventeenth lens L17 can have negative optical power, with its object-side surface S28 being concave and its image-side surface S29 being concave. The eighteenth lens L18 can have negative optical power, with its object-side surface S30 being concave and its image-side surface S31 being concave.

[0126] The sixth lens group G6 includes the nineteenth lens L19, the twentieth lens L20, the twenty-first lens L21, the twenty-second lens L22, and the twenty-third lens L23. The nineteenth lens L19 has positive optical power, with both its object-side surface S32 and image-side surface being convex. The twentieth lens L20 has negative optical power, with both its object-side surface S33 and image-side surface S34 being concave. The twenty-first lens L21 has positive optical power, with both its object-side surface S35 and image-side surface S36 being convex. The twenty-second lens L22 has positive optical power, with both its object-side surface S37 and image-side surface being concave. The twenty-third lens L23 has positive optical power, with both its object-side surface S38 and image-side surface S39 being concave. The nineteenth lens L19 and the twentieth lens L20 are cemented together to form a cemented lens, and the twenty-second lens L22 and the twenty-third lens L23 are cemented together to form another cemented lens.

[0127] The seventh lens group G7 includes the twenty-fourth lens L24 and the twenty-fifth lens L25. The twenty-fourth lens L24 has positive optical power, with both its object-side surface S40 and image-side surface being convex. The twenty-fifth lens L25 has negative optical power, with both its object-side surface S41 and image-side surface S42 being concave. The twenty-fourth lens L24 and the twenty-fifth lens L25 are cemented together to form a cemented lens.

[0128] Light from the object passes through each surface S1 to S42 in sequence and is finally imaged on the imaging surface IMA.

[0129] Table 5 shows the basic parameters of the zoom lens 300 of Embodiment 3, wherein the units for radius of curvature, thickness / distance and focal length are millimeters (mm).

[0130]

[0131]

[0132] Table 5

[0133] In this embodiment, at each focal length end, the focal length of the zoom lens and the air spacing of adjacent lens groups on the optical axis are shown in Table 6. Wherein, D1 is the air spacing of the first and second lens groups on the optical axis; D2 is the air spacing of the second and third lens groups on the optical axis; D3 is the air spacing of the third and fourth lens groups on the optical axis; D4 is the air spacing of the fourth and fifth lens groups on the optical axis; D5 is the air spacing of the fifth and sixth lens groups on the optical axis; and D6 is the air spacing of the sixth and seventh lens groups on the optical axis.

[0134] Short focal length end Middle coke end telephoto end focal length 48.002 120.006 250.008 OBJ INF INF INF D1 0.751 7.857 7.631 D2 21.497 53.096 78.937 D3 65.230 26.525 0.910 D4 8.313 10.589 16.972 D5 17.301 6.677 28.715 D6 20.484 28.832 0.411

[0135] Table 6

[0136] Figures 10A to 10C The RAY FAN diagram, field curvature and distortion diagram, and axial chromatic aberration diagram of the short focal length of zoom lens 300 are shown respectively. Figures 12A to 12C The RAY FAN chart, field curvature and distortion chart, and axial chromatic aberration chart of the telephoto end of zoom lens 300 are shown respectively. Therefore, according to Figures 10A to 10C as well as Figures 12A to 12C It can be seen that the zoom lens 300 given in Example 3 can achieve good imaging quality at different focal lengths.

[0137] Example 4

[0138] The following is for reference Figures 13 to 16C A zoom lens according to Embodiment 4 of this application is described. Figure 13 This is a schematic diagram of the short focal length end of the zoom lens according to Embodiment 4 of this application; Figure 15 This is a schematic diagram of the telephoto end of the zoom lens according to Embodiment 4 of this application.

[0139] like Figure 13 and Figure 15 As shown, the zoom lens 400 includes, along the optical axis from the object side to the image plane IMA, the following elements in sequence: a first lens group G1 with positive optical power, a second lens group G2 with negative optical power, a third lens group G3 with negative optical power, a fourth lens group G4 with positive optical power, a fifth lens group G5 with negative optical power, a sixth lens group G6 with positive optical power, and a seventh lens group G7 with positive optical power.

[0140] The first lens group G1 includes a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4. The first lens L1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being convex. The second lens L2 has negative optical power, with its object-side surface S3 being convex and its image-side surface being concave. The third lens L3 has positive optical power, with its object-side surface S4 being convex and its image-side surface S5 being convex. The fourth lens L4 has positive optical power, with its object-side surface S6 being convex and its image-side surface S7 being convex. The second lens L2 and the third lens L3 are cemented together to form a cemented lens.

[0141] The second lens group G2 includes a fifth lens L5 and a sixth lens L6. The fifth lens L5 can have positive optical power, with its object-side surface S8 being concave and its image-side surface being convex. The sixth lens L6 can have negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being concave. The fifth lens L5 and the sixth lens L6 are cemented together to form a cemented lens.

[0142] The third lens group G3 includes a seventh lens L7, an eighth lens L8, a ninth lens L9, and a tenth lens L10. The seventh lens L7 can have negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being concave. The eighth lens L8 can have negative optical power, with its object-side surface S13 being concave and its image-side surface being concave. The ninth lens L9 can have positive optical power, with its object-side surface S14 being convex and its image-side surface S15 being concave. The tenth lens L10 can have negative optical power, with its object-side surface S16 being concave and its image-side surface S17 being concave. The eighth lens L8 and the ninth lens L9 are cemented together to form a cemented lens.

[0143] The fourth lens group G4 includes the eleventh lens L11, the twelfth lens L12, the thirteenth lens L13, the fourteenth lens L14, and the fifteenth lens L15. The eleventh lens L11 has positive optical power, with a convex object-side surface S18 and a convex image-side surface S19. The twelfth lens L12 has negative optical power, with a convex object-side surface S20 and a concave image-side surface. The thirteenth lens L13 has positive optical power, with a convex object-side surface S21 and a concave image-side surface S22. The fourteenth lens L14 has positive optical power, with a convex object-side surface S23 and a concave image-side surface. The fifteenth lens L15 has negative optical power, with a convex object-side surface S24 and a concave image-side surface S25. The twelfth lens L12 and the thirteenth lens L13 are cemented together to form a cemented lens, and the fourteenth lens L14 and the fifteenth lens L15 are cemented together to form a cemented lens. The aperture STO can be set between the thirteenth lens L13 and the fourteenth lens L14.

[0144] The fifth lens group G5 includes the sixteenth lens L16, the seventeenth lens L17, and the eighteenth lens L18. The sixteenth lens L16 can have positive optical power, with its object-side surface S26 being convex and its image-side surface S27 being convex. The seventeenth lens L17 can have negative optical power, with its object-side surface S28 being concave and its image-side surface S29 being concave. The eighteenth lens L18 can have negative optical power, with its object-side surface S30 being convex and its image-side surface S31 being concave.

[0145] The sixth lens group G6 includes the nineteenth lens L19, the twentieth lens L20, the twenty-first lens L21, the twenty-second lens L22, and the twenty-third lens L23. The nineteenth lens L19 has positive optical power, with both its object-side surface S32 and image-side surface being convex. The twentieth lens L20 has negative optical power, with both its object-side surface S33 and image-side surface S34 being concave. The twenty-first lens L21 has positive optical power, with both its object-side surface S35 and image-side surface S36 being convex. The twenty-second lens L22 has negative optical power, with both its object-side surface S37 and image-side surface being concave. The twenty-third lens L23 has positive optical power, with both its object-side surface S38 and image-side surface S39 being convex. The nineteenth lens L19 and the twentieth lens L20 are cemented together to form a cemented lens, and the twenty-second lens L22 and the twenty-third lens L23 are cemented together to form another cemented lens.

[0146] The seventh lens group G7 includes the twenty-fourth lens L24 and the twenty-fifth lens L25. The twenty-fourth lens L24 has positive optical power, with its object-side surface S40 being convex and its image-side surface being concave. The twenty-fifth lens L25 also has positive optical power, with its object-side surface S41 being convex and its image-side surface S42 being concave. The twenty-fourth lens L24 and the twenty-fifth lens L25 are cemented together to form a cemented lens.

[0147] Light from the object passes through each surface S1 to S42 in sequence and is finally imaged on the imaging surface IMA.

[0148] Table 7 shows the basic parameters of the zoom lens 400 of Embodiment 4, wherein the units for radius of curvature, thickness / distance and focal length are millimeters (mm).

[0149]

[0150]

[0151] Table 7

[0152] In this embodiment, at each focal length end, the focal length of the zoom lens and the air spacing of adjacent lens groups on the optical axis are shown in Table 8. Wherein, D1 is the air spacing of the first and second lens groups on the optical axis; D2 is the air spacing of the second and third lens groups on the optical axis; D3 is the air spacing of the third and fourth lens groups on the optical axis; D4 is the air spacing of the fourth and fifth lens groups on the optical axis; D5 is the air spacing of the fifth and sixth lens groups on the optical axis; and D6 is the air spacing of the sixth and seventh lens groups on the optical axis.

[0153] Short focal length end Middle coke end telephoto end focal length 48.003 120.001 250.004 OBJ INF INF INF D1 1.942 7.695 0.100 D2 18.638 50.964 92.073 D3 71.693 33.614 0.100 D4 9.833 13.353 2.109 D5 14.738 1.082 0.100 D6 0.100 10.236 22.462

[0154] Table 8

[0155] Figures 14A to 14C The RAY FAN diagram, field curvature and distortion diagram, and axial chromatic aberration diagram of the short focal length of zoom lens 400 are shown respectively. Figures 16A to 16C The RAY FAN chart, field curvature and distortion chart, and axial chromatic aberration chart of the telephoto end of zoom lens 400 are shown respectively. Therefore, according to Figures 14A to 14C as well as Figures 16A to 16C It can be seen that the zoom lens 400 given in Example 4 can achieve good imaging quality at different focal lengths.

[0156] In summary, the conditional expressions in Examples 1 to 4 satisfy the relationships shown in Table 9.

[0157]

[0158]

[0159] Table 9

[0160] This application also provides an imaging device, wherein the electronic photosensitive element may be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS), and the imaging device is equipped with the zoom lens described above.

[0161] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A zoom lens, characterized in that, in order from the object side to the image side along the optical axis: a first lens group having positive refractive power, including, in order from the object side to the image side along the optical axis, a first lens having positive refractive power, a second lens having negative refractive power, a third lens having positive refractive power, and a fourth lens having positive refractive power; a second lens group having negative refractive power, including, in order from the object side to the image side along the optical axis, a fifth lens having positive refractive power, and a sixth lens having negative refractive power; a third lens group having negative refractive power, including, in order from the object side to the image side along the optical axis, a seventh lens having negative refractive power, an eighth lens having negative refractive power, a ninth lens having positive refractive power, and a tenth lens having negative refractive power; a fourth lens group having positive refractive power, including, in order from the object side to the image side along the optical axis, an eleventh lens having positive refractive power, a twelfth lens having negative refractive power, a thirteenth lens having positive refractive power, a fourteenth lens having positive refractive power, a fifteenth lens having negative refractive power, a sixteenth lens having positive refractive power, a seventeenth lens having positive refractive power, and an eighteenth lens having negative refractive power; a fifth lens group having negative refractive power, including, in order from the object side to the image side along the optical axis, a nineteenth lens having positive refractive power, a twentieth lens having negative refractive power, and a twenty-first lens having negative refractive power; a sixth lens group having positive refractive power, including, in order from the object side to the image side along the optical axis, a twenty-second lens having positive refractive power, a twenty-third lens having negative refractive power, a twenty-fourth lens having positive refractive power, a twenty-fifth lens having negative refractive power, and a twenty-sixth lens having positive refractive power; and a seventh lens group having negative refractive power, including, in order from the object side to the image side along the optical axis, a twenty-seventh lens having negative refractive power, and a twenty-eighth lens having positive refractive power; wherein the number of lenses having refractive power in the zoom lens is twenty-eight; the first lens group, the fourth lens group, and the seventh lens group are fixed in position relative to the image plane, and the second lens group, the third lens group, the fifth lens group, and the sixth lens group are adjustable in distance along the optical axis relative to the image plane; The zoom lens also satisfies: 5.08≤F T / F W ≤5.92, wherein F T is a long-focus end focal length of the zoom lens, and F W is a short-focus end focal length of the zoom lens.

2. The zoom lens according to claim 1, characterized by the third lens is configured as a double convex lens.

3. The zoom lens according to claim 1, characterized by the sixth lens is configured as a double concave lens.

4. The zoom lens according to claim 1, characterized by the eighth lens and the tenth lens are configured as double concave lenses.

5. The zoom lens according to claim 1, characterized by the eleventh lens, the thirteenth lens, and the sixteenth lens are configured as double convex lenses, and the twelfth lens, the seventeenth lens, and the eighteenth lens are configured as convex-concave lenses.

6. The zoom lens according to claim 1, characterized by the nineteenth lens is configured as a double convex lens, and the twentieth lens and the twenty-first lens are configured as double concave lenses.

7. The zoom lens according to claim 1, characterized by the twenty-second lens, the twenty-fourth lens, and the twenty-sixth lens are configured as double convex lenses, and the twenty-fifth lens is configured as a double concave lens.

8. The zoom lens according to any one of claims 1 to 7, wherein the zoom lens includes nine cemented lenses.

9. The zoom lens according to any one of claims 1 to 7, wherein the zoom lens further satisfies: 0.15 < F W TTL < 0.20, 0.90 < F T TTL < 1.02, TTL is the total track length of the zoom lens.

10. The zoom lens according to any one of claims 1 to 7, wherein The zoom lens further satisfies: 0.32 < T G4 F G4 ≤ 0.72, wherein T G4 is the total optical length of the fourth lens group, F G4 is the focal length of the fourth lens group.

11. The zoom lens according to any one of claims 1 to 7, wherein The zoom lens further satisfies: 9.64 ≤ TTL / H ≤ 10.47, TTL is the total track length of the zoom lens, and H is the diameter of the imaging target surface of the zoom lens.

12. The zoom lens according to any one of claims 1 to 7, wherein The zoom lens further satisfies: 0.87 < F G4 / F W ≤ 1.51, wherein F G4 is the focal length of the fourth lens group.

13. The zoom lens according to any one of claims 1 to 7, wherein The zoom lens further satisfies: 2.08 < F T F G1 ≤ 2.33, wherein F G1 is the focal length of the first lens group.

14. The zoom lens according to any one of claims 1 to 7, wherein The zoom lens further satisfies: 0.24 < Δ L3 TTL < 0.30, wherein Δ L3 is the maximum moving stroke of the third lens group, and TTL is the total track length of the zoom lens.

15. The zoom lens according to any one of claims 1 to 7, wherein The zoom lens further satisfies: 0.05 < Δ < 0.15 L6 TTL < 0.13, wherein Δ L6 is the maximum moving stroke of the sixth lens group, and TTL is the total track length of the zoom lens.

16. The zoom lens according to any one of claims 1 to 7, wherein The zoom lens further satisfies: 0.93≤2F T × tan (FOV T / 2) / H≤0.98, wherein FOV T is the long focal end field of view of the zoom lens, and H is the imaging target surface diameter of the zoom lens.

17. The zoom lens according to claim 6, characterized by The zoom lens further satisfies: -1.29 < R 53 / F G53 ≤ -0.52, Among them, R 53 F is the radius of curvature of the image-side surface of the third lens in the fifth lens group. G53 This refers to the focal length of the third lens in the fifth lens group.

18. The zoom lens according to any one of claims 1 to 7, wherein The zoom lens further satisfies: 0.33 < T 11 / T G1 ≤ 0.61, wherein T 11 is the center thickness of the first cemented lens in the first lens group on the optical axis, T G1 is the total optical length of the first lens group.

19. The zoom lens according to any one of claims 1 to 7, wherein The first lens group includes at least one cemented lens, and the zoom lens further satisfies: -7.05 < F G2 / F W ≤ -4.50, where F G2 is the focal length of the second lens group.

20. The zoom lens according to any one of claims 1 to 7, wherein The zoom lens further satisfies: -21.69 < F G7 / F W <0, wherein F G7 is the focal length of the seventh lens group.

21. The zoom lens according to any one of claims 1 to 7, wherein The zoom lens further satisfies: The zoom lens further satisfies: 0.01 ≤ BFL / TTL ≤ 0.07, 22. A zoom lens characterized by comprising: TTL is the total track length of the zoom lens, and BFL is the back focal length of the zoom lens. comprises, in order from the object side to the image side along the optical axis: a first lens group with positive refractive power, comprising, in order from the object side to the image side along the optical axis, a first lens with positive refractive power, a second lens with positive refractive power, a third lens with negative refractive power, and a fourth lens with positive refractive power; a second lens group with negative refractive power, comprising, in order from the object side to the image side along the optical axis, a fifth lens with positive refractive power and a sixth lens with negative refractive power; a third lens group with negative refractive power, comprising, in order from the object side to the image side along the optical axis, a seventh lens with negative refractive power, an eighth lens with positive refractive power, a ninth lens with negative refractive power, and a tenth lens with negative refractive power; a fourth lens group with positive refractive power, comprising, in order from the object side to the image side along the optical axis, an eleventh lens with positive refractive power, a twelfth lens with negative refractive power, a thirteenth lens with positive refractive power, and a fourteenth lens with positive refractive power; a fifth lens group with negative refractive power, comprising, in order from the object side to the image side along the optical axis, a fifteenth lens with positive refractive power, a sixteenth lens with negative refractive power, and a seventeenth lens with negative refractive power; a sixth lens group with positive refractive power, comprising, in order from the object side to the image side along the optical axis, an eighteenth lens with positive refractive power, a nineteenth lens with negative refractive power, a twentieth lens with positive refractive power, a twenty-first lens with negative refractive power, and a twenty-second lens with positive refractive power; and a seventh lens group with negative refractive power, comprising a twenty-third lens with negative refractive power; The number of lenses with refractive power in the zoom lens is twenty-three. The zoom lens also satisfies: 5.08≤F T / F W ≤5.92, wherein F T is a long-focus end focal length of the zoom lens, and F W is a short-focus end focal length of the zoom lens.

23. The zoom lens according to claim 22, characterized by The first lens group, the fourth lens group, and the seventh lens group are fixed in position relative to the image surface, and the second lens group, the third lens group, the fifth lens group, and the sixth lens group are adjustable in distance along the optical axis relative to the image surface.

24. The zoom lens according to claim 22, characterized by The first lens, the second lens, and the fourth lens are configured as double-convex lenses.

25. The zoom lens according to claim 22, wherein The sixth lens is configured as a double-concave lens. The seventh lens, the ninth lens, and the tenth lens are configured as double-concave lenses.

26. The zoom lens according to claim 22, wherein The eleventh lens and the fourteenth lens are configured as double convex lenses, the twelfth lens and the thirteenth lens are configured as convex-concave lenses.

27. The zoom lens according to claim 22, wherein The fifteenth lens is configured as a double convex lens, the sixteenth lens and the seventeenth lens are configured as double concave lenses.

28. The zoom lens according to claim 22, wherein The eighteenth lens, the twentieth lens and the twenty-second lens are configured as double convex lenses, and the nineteenth lens is configured as a double concave lens.

29. The zoom lens according to any one of Claims 22-28, wherein The zoom lens comprises five cemented lenses.

30. The zoom lens according to any one of claims 22 to 28, wherein The zoom lens also satisfies: 0.15 < F W TTL < 0.20, 0.90 < F T TTL < 1.02, Wherein, TTL is the total track length of the zoom lens.

31. The zoom lens according to any one of claims 22 to 28, wherein The zoom lens also satisfies: 0.32 < T G4 F G4 ≤ 0.72, wherein T G4 is the total optical length of the fourth lens group, F G4 is the focal length of the fourth lens group.

32. The zoom lens according to any one of claims 22 to 28, wherein The zoom lens also satisfies: 9.64 ≤TTL / H≤10.47, Wherein, TTL is the total track length of the zoom lens, and H is the imaging target surface diameter of the zoom lens.

33. The zoom lens according to any one of claims 22 to 28, wherein The zoom lens also satisfies: 0.87 < F G4 / F W ≤ 1.51, wherein F G4 is the focal length of the fourth lens group.

34. The zoom lens according to any one of claims 22 to 28, wherein The zoom lens also satisfies: 2.08 < F T / F G1 ≤ 2.33, wherein F G1 is the focal length of the first lens group.

35. The zoom lens according to any one of claims 22 to 28, wherein The zoom lens also satisfies: 0.24 < Δ L3 TTL < 0.30, wherein Δ L3 is the maximum moving stroke of the third lens group, and TTL is the total track length of the zoom lens.

36. The zoom lens according to any one of claims 22 to 28, wherein The zoom lens also satisfies: 0.05 < Δ < 0.15 L6 TTL < 0.13, wherein Δ L6 is the maximum moving stroke of the sixth lens group, and TTL is the total track length of the zoom lens.

37. The zoom lens according to any one of claims 22 to 28, wherein The zoom lens also satisfies: 0.93≤2F T × tan (FOV T / 2) / H≤0.98, wherein FOV T is the long focal end field of view of the zoom lens, and H is the imaging target surface diameter of the zoom lens.

38. The zoom lens according to claim 27, wherein The zoom lens also satisfies: -1.29 < R 53 / F G53 ≤ -0.52, Among them, R 53 F is the radius of curvature of the image-side surface of the third lens in the fifth lens group. G53 This refers to the focal length of the third lens in the fifth lens group.

39. The zoom lens according to any one of claims 22 to 28, wherein The zoom lens also satisfies: 0.33 < T 11 / T G1 ≤ 0.61, wherein T 11 is the center thickness of a first cemented lens in the first lens group on the optical axis, T G1 is the total optical length of the first lens group.

40. The zoom lens according to any one of claims 22 to 28, wherein The first lens group comprises at least one cemented lens, and the zoom lens also satisfies: -7.05 < F G2 / F W ≤ -4.50, wherein F G2 is the focal length of the second lens group.

41. The zoom lens according to any one of Claims 22-28, wherein The zoom lens also satisfies: -21.69 < F G7 / F W <0, wherein F G7 is the focal length of the seventh lens group.

42. The zoom lens according to any one of claims 22 to 28, wherein The zoom lens also satisfies: The zoom lens also satisfies: 0.01≤BFL / TTL≤0.07, 43. A zoom lens, characterized in that, Wherein, BFL is the back focal length of the zoom lens, and TTL is the total track length of the zoom lens. comprises, in order from the object side to the image plane along the optical axis: a first lens group with positive refractive power, comprising, in order from the object side to the image plane along the optical axis, a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with negative refractive power, and a fifth lens with positive refractive power; a second lens group with negative refractive power, comprising, in order from the object side to the image plane along the optical axis, a sixth lens with positive refractive power and a seventh lens with negative refractive power; a third lens group with negative refractive power, comprising, in order from the object side to the image plane along the optical axis, an eighth lens with negative refractive power, a ninth lens with negative refractive power, a tenth lens with positive refractive power, and an eleventh lens with negative refractive power; a fourth lens group with positive refractive power, comprising, in order from the object side to the image plane along the optical axis, a twelfth lens with positive refractive power, a thirteenth lens with negative refractive power, a fourteenth lens with positive refractive power, and a fifteenth lens with positive refractive power; a fifth lens group with negative refractive power, comprising, in order from the object side to the image plane along the optical axis, a sixteenth lens with positive refractive power, a seventeenth lens with negative refractive power, and an eighteenth lens with negative refractive power; a sixth lens group with positive refractive power, comprising, in order from the object side to the image plane along the optical axis, a nineteenth lens with positive refractive power, a twentieth lens with negative refractive power, a twenty-first lens with positive refractive power, a twenty-second lens with positive refractive power, and a twenty-third lens with positive refractive power; and the seventh lens group with negative refractive power comprises, in order from the object side to the image plane along the optical axis, a twenty-fourth lens with positive refractive power and a twenty-fifth lens with negative refractive power; wherein the number of lenses with refractive power in the zoom lens is twenty-five; positions of the first lens group, the fourth lens group and the seventh lens group relative to the image plane are fixed, distances of the second lens group, the third lens group, the fifth lens group and the sixth lens group relative to the image plane on the optical axis are adjustable; The zoom lens also satisfies: 5.08≤F T / F W ≤5.92, wherein F T is a long-focus end focal length of the zoom lens, and F W is a short-focus end focal length of the zoom lens.

44. The zoom lens according to claim 43, characterized by the first lens and the third lens are configured as double-convex lenses.

45. The zoom lens according to claim 43, characterized by the seventh lens is configured as a double-concave lens.

46. The zoom lens according to claim 43, wherein the eighth lens, the ninth lens and the eleventh lens are configured as double-concave lenses.

47. The zoom lens according to claim 43, wherein the twelfth lens and the fourteenth lens are configured as double-convex lenses, and the thirteenth lens and the fifteenth lens are configured as convex-concave lenses.

48. The zoom lens according to claim 43, wherein the sixteenth lens is configured as a double-convex lens, and the seventeenth lens and the eighteenth lens are configured as double-concave lenses.

49. The zoom lens according to claim 43, wherein the nineteenth lens and the twenty-first lens are configured as double-convex lenses, and the twentieth lens is configured as a double-concave lens.

50. The zoom lens according to any one of claims 43-49, wherein, the zoom lens comprises eight cemented lenses.

51. The zoom lens according to any one of Claims 43-49, wherein, the zoom lens further satisfies: 0.15 < F W TTL < 0.20, 0.90 < F T TTL < 1.02, wherein TTL is the total optical length of the zoom lens.

52. The zoom lens according to any one of claims 43-49, wherein, the zoom lens further satisfies: 0.32 < T G4 F G4 ≤ 0.72, wherein T G4 is the total track length of the fourth lens group, F G4 is the focal length of the fourth lens group.

53. The zoom lens according to any one of claims 43-49, wherein, the zoom lens further satisfies: 9.64 ≤TTL / H≤10.47, wherein TTL is the total optical length of the zoom lens, and H is the diameter of the imaging target surface of the zoom lens.

54. The zoom lens according to any one of claims 43-49, wherein, the zoom lens further satisfies: 0.87 < F G4 / F W ≤ 1.51, wherein F G4 is the focal length of the fourth lens group.

55. The zoom lens according to any one of claims 43-49, wherein, the zoom lens further satisfies: 2.08 < F T / F G1 ≤ 2.33, wherein F G1 is the focal length of the first lens group.

56. The zoom lens according to any one of claims 43-49, wherein, the zoom lens further satisfies: 0.24 < Δ L3 TTL < 0.30, wherein Δ L3 is the maximum moving stroke of the third lens group, and TTL is the total track length of the zoom lens.

57. The zoom lens according to any one of claims 43-49, wherein, the zoom lens further satisfies: 0.05 < Δ < 0.15 L6 TTL < 0.13, wherein Δ L6 is the maximum moving stroke of the sixth lens group, and TTL is the total track length of the zoom lens.

58. The zoom lens according to any one of claims 43-49, wherein, the zoom lens further satisfies: 0.93≤2F T × tan (FOV T / 2) / H≤0.98, wherein FOV T is the long focal end field of view of the zoom lens, and H is the imaging target surface diameter of the zoom lens.

59. The zoom lens of claim 48, wherein, the zoom lens further satisfies: -1.29 < R 53 / F G53 ≤ -0.52, wherein R 53 is the radius of curvature of the image side surface of the third lens in the fifth lens group, F G53 is the focal length of the third lens in the fifth lens group.

60. The zoom lens according to any one of claims 43-49, wherein, the zoom lens further satisfies: 0.33 < T 11 / T G1 ≤ 0.61, wherein T 11 is the center thickness of the first cemented lens in the first lens group on the optical axis, T G1 is the total optical length of the first lens group.

61. The zoom lens according to any one of claims 43-49, wherein, the first lens group comprises at least one cemented lens, and the zoom lens further satisfies: - 7.05 < F G2 / F W ≤ -4.50, wherein F G2 is the focal length of the second lens group.

62. The zoom lens according to any one of claims 43-49, wherein, the zoom lens further satisfies: -21.69 < F G7 / F W <0, wherein F G7 is the focal length of the seventh lens group.

63. The zoom lens according to any one of claims 43-49, wherein, the zoom lens further satisfies: the zoom lens further satisfies: 0.01≤BFL / TTL≤0.07, 64. A zoom lens characterized by comprising: wherein BFL is the back focal length of the zoom lens, and TTL is the total optical length of the zoom lens. comprises, in order from the object side to the image plane along the optical axis: the first lens group with positive refractive power comprises, in order from the object side to the image plane along the optical axis, a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power and a fourth lens with positive refractive power; the second lens group with negative refractive power comprises, in order from the object side to the image plane along the optical axis, a fifth lens with positive refractive power and a sixth lens with negative refractive power; the third lens group with negative refractive power comprises, in order from the object side to the image plane along the optical axis, a seventh lens with negative refractive power, an eighth lens with negative refractive power, a ninth lens with positive refractive power and a tenth lens with negative refractive power; The fourth lens group with positive refractive power comprises, in order from the object side to the image plane along the optical axis, a eleventh lens with positive refractive power, a twelfth lens with negative refractive power, a thirteenth lens with positive refractive power, a fourteenth lens with positive refractive power, and a fifteenth lens with negative refractive power; The fifth lens group with negative refractive power comprises, in order from the object side to the image plane along the optical axis, a sixteenth lens with positive refractive power, a seventeenth lens with negative refractive power, and an eighteenth lens with negative refractive power; The sixth lens group with positive refractive power comprises, in order from the object side to the image plane along the optical axis, a nineteenth lens with positive refractive power, a twentieth lens with negative refractive power, a twenty-first lens with positive refractive power, a twenty-second lens with negative refractive power, and a twenty-third lens with positive refractive power; and The seventh lens group with positive refractive power comprises, in order from the object side to the image plane along the optical axis, a twenty-fourth lens with positive refractive power and a twenty-fifth lens with positive refractive power; The number of lenses with refractive power in the zoom lens is twenty-five; The first lens group, the fourth lens group, and the seventh lens group are fixed relative to the image plane, and the second lens group, the third lens group, the fifth lens group, and the sixth lens group are adjustable in distance relative to the image plane along the optical axis; The zoom lens also satisfies: 5.08≤F T / F W ≤5.92, wherein F T is a long-focus end focal length of the zoom lens, and F W is a short-focus end focal length of the zoom lens.

65. The zoom lens according to claim 64, wherein The first lens, the third lens, and the fourth lens are configured as double-convex lenses.

66. The zoom lens according to claim 64, wherein The sixth lens is configured as a double-concave lens.

67. The zoom lens of claim 64, wherein The seventh lens, the eighth lens, and the tenth lens are configured as double-concave lenses.

68. The zoom lens of claim 64, wherein The eleventh lens is configured as a double-convex lens, and the twelfth lens, the thirteenth lens, the fourteenth lens, and the fifteenth lens are configured as convex-concave lenses.

69. The zoom lens of claim 64, wherein The sixteenth lens is configured as a double-convex lens, and the seventeenth lens is configured as a double-concave lens.

70. The zoom lens of claim 64, wherein The nineteenth lens, the twenty-first lens, and the twenty-third lens are configured as double-convex lenses, and the twentieth lens and the twenty-second lens are configured as double-concave lenses.

71. The zoom lens according to any one of claims 64-70, wherein The zoom lens comprises eight cemented lenses.

72. The zoom lens according to any one of claims 64-70, wherein The zoom lens further satisfies: 0.15 < F W / TTL < 0.20, 0.90 < F T TTL < 1.02, wherein TTL is the total optical length of the zoom lens.

73. The zoom lens according to any one of claims 64-70, wherein The zoom lens further satisfies: 0.32 < T G4 / F G4 ≤ 0.72, wherein T G4 is the total optical length of the fourth lens group, F G4 is the focal length of the fourth lens group.

74. The zoom lens according to any one of claims 64-70, wherein The zoom lens further satisfies: 9.64 ≤TTL / H ≤10.47, wherein TTL is the total optical length of the zoom lens, and H is the imaging target surface diameter of the zoom lens.

75. The zoom lens according to any one of claims 64-70, wherein, The zoom lens further satisfies: 0.87 < F G4 / F W ≤ 1.51, wherein F G4 is the focal length of the fourth lens group.

76. The zoom lens according to any one of claims 64-70, wherein, The zoom lens further satisfies: 2.08 < F T / F G1 ≤ 2.33, wherein F G1 is the focal length of the first lens group.

77. The zoom lens according to any one of claims 64-70, wherein The zoom lens further satisfies: 0.24 < Δ L3 TTL < 0.30, wherein Δ L3 is the maximum moving stroke of the third lens group, and TTL is the total track length of the zoom lens.

78. The zoom lens according to any one of claims 64-70, wherein The zoom lens further satisfies: 0.05 < Δ < 0.15 L6 TTL < 0.13, wherein Δ L6 is the maximum moving stroke of the sixth lens group, and TTL is the total track length of the zoom lens.

79. The zoom lens according to any one of claims 64-70, wherein The zoom lens further satisfies: 0.93 < 2F T x tan(FOV T / 2) / H < 0.98, wherein FOV T is the long focal end field of view of the zoom lens, and H is the imaging target surface diameter of the zoom lens.

80. The zoom lens of claim 69, wherein The zoom lens further satisfies: -1.29 < R 53 / F G53 ≤ -0.52, Among them, R 53 F is the radius of curvature of the image-side surface of the third lens in the fifth lens group. G53 This refers to the focal length of the third lens in the fifth lens group.

81. The zoom lens according to any one of claims 64-70, wherein, The first lens group comprises at least one cemented lens, and the zoom lens further satisfies: 0.33 < T 11 / T G1 ≤ 0.61, wherein T 11 is the center thickness of the first cemented lens in the first lens group on the optical axis, T G1 is the total optical length of the first lens group.

82. The zoom lens according to any one of claims 64-70, wherein, The zoom lens further satisfies: -7.05 < F G2 / F W ≤ -4.50, where F G2 is the focal length of the second lens group.

83. The zoom lens according to any one of claims 64-70, wherein The zoom lens further satisfies: 0 < F G7 / F W ≤ 5.72, wherein F G7 is the focal length of the seventh lens group.

84. The zoom lens according to any one of claims 64-70, wherein, The zoom lens further satisfies: 0.01≤BFL / TTL≤0.07, wherein BFL is the back focal length of the zoom lens, and TTL is the total optical length of the zoom lens.

Images