A zoom lens set

Abstract

The present invention discloses a zoom lens group, which includes, in order from the object side to the image side along the optical axis: a first lens group, which includes a first lens; a second lens group, which includes, in order along the optical axis, an aperture, a second lens with positive focal power, a third lens, a fourth lens with negative focal power, and a fifth lens; and a third lens group, which includes, in order along the optical axis, a sixth lens and a seventh lens with positive focal power; the lenses are not attached to each other; and the third lens group moves along the optical axis with the second lens group. By reasonably allocating the focal power of the second lens and the fourth lens in the second group, the system can have a smaller axial aberration. By reasonably allocating the focal power of the first lens in the telephoto end state, the system aberration can be balanced; by making the air interval between different parts variable, the lens group can have a good imaging effect at different focal lengths.

Description

Technical Field

[0001] The invention belongs to the field of optical elements, and in particular relates to a zoom lens group. Background Art

[0002] With the development of technology, traditional fixed-focus lenses are gradually unable to meet the higher demands of people in daily work and life. People hope to be able to shoot closer or farther objects more easily. Therefore, it has become a general trend to apply optical zoom lens groups to electronic products such as mobile phones. The optical zoom lens group of electronic products such as smartphones is realized through a series of lens elements. The camera can zoom in and out by moving the lens, which is more conducive to shooting objects of different distances and sizes.

[0003] Therefore, the present invention provides a seven-piece optical zoom lens group with good imaging quality. Summary of the invention

[0004] The present invention aims to provide a zoom lens group composed of seven lenses, which has good imaging quality.

[0005] The present invention provides a zoom lens assembly, which includes, in order from the object side to the image side along the optical axis:

[0006] A first lens group including a first lens;

[0007] A second lens group includes, in order along the optical axis, an aperture stop, a second lens having positive refractive power, a third lens, a fourth lens having negative refractive power, and a fifth lens; and

[0008] A third lens group includes, in sequence along the optical axis, a sixth lens and a seventh lens having positive refractive power;

[0009] Among them, the lenses are not adhered to each other;

[0010] The third lens group moves along the optical axis along with the second lens group.

[0011] According to one embodiment of the present application, a radius of curvature R4 of the image-side surface of the second lens and an effective focal length f2 of the second lens satisfy: 1.3<|R4 / f2|<6.6.

[0012] According to one embodiment of the present application, the maximum field of view angle |FOV W |Satisfy: 20°<|FOV W |<55°.

[0013] According to one embodiment of the present application, the effective focal length f1 of the first lens, the curvature radius R1 of the object side surface of the first lens, and the curvature radius R2 of the image side surface of the first lens satisfy: 19.0 <R1 / f1*R2<22.0。

[0014] According to one embodiment of the present application, the effective focal length f2 of the second lens and the effective focal length f6 of the sixth lens satisfy: 1.0 <f6 / f2<2.0。

[0015] According to one embodiment of the present application, the total focal length f of the zoom lens group at different zoom factors is W Entrance pupil diameter EPD at different zoom factors of zoom lens group W Satisfaction: 2.0 <f W / EPD W <4.5.

[0016] According to one embodiment of the present application, a curvature radius R4 of the image-side surface of the second lens and a curvature radius R11 of the object-side surface of the sixth lens satisfy: 1.5<|R4 / R11|<7.5.

[0017] According to one embodiment of the present application, the effective focal length f4 of the fourth lens, the effective focal length f5 of the fifth lens, and the effective focal length f7 of the seventh lens satisfy: 1.5<(f4-f5) / f7<5.5.

[0018] According to one embodiment of the present application, the effective focal length f6 of the sixth lens and the curvature radius R11 of the object side surface of the sixth lens satisfy: -2.5 <f6 / R11<-1.5。

[0019] According to one embodiment of the present application, the curvature radius R12 of the image side surface of the sixth lens and the curvature radius R13 of the object side surface of the seventh lens satisfy: 1.5 <R13 / R12<2.0。

[0020] According to one embodiment of the present application, the on-axis distance TTL from the object side of the first lens to the imaging surface, the center thickness CT1 of the first lens on the optical axis, and the center thickness CT2 of the second lens on the optical axis satisfy: 14.5 <TTL / (CT1+CT4)<20.5。

[0021] According to one embodiment of the present application, the center thickness CT2 of the second lens on the optical axis and the center thickness CT3 of the third lens on the optical axis satisfy: 1.5 <CT2 / CT3<4.0。

[0022] According to one embodiment of the present application, the center thickness CT6 of the sixth lens on the optical axis and the center thickness CT7 of the seventh lens on the optical axis satisfy: 2.0 <CT6 / CT7<4.0。

[0023] According to one embodiment of the present application, the Abbe number V3 of the third lens and the Abbe number V4 of the fourth lens satisfy: V3-V4<5.0.

[0024] According to one embodiment of the present application, the air interval D1 between the surface closest to the image side and the aperture on the optical axis of the first lens group at different zoom magnifications and the air interval D2 between the surface closest to the image side and the surface closest to the object side of the third lens group at different zoom magnifications on the optical axis satisfy the following conditions: 2.5 <D1 / D2<23.0。

[0025] According to one embodiment of the present application, the total focal length f of the zoom lens group at different zoom factors is W The air gap D3 between the surface closest to the image side of the third lens group and the filter on the optical axis meets 1.5 at different zoom factors. <f W / D3<13.0.

[0026] The present application provides a zoom lens group with good imaging quality by reasonably allocating optical focal length and optimizing optical parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 It is a structural schematic diagram of the zoom lens assembly of Example 1 of the present application when it is in a wide-angle state;

[0029] Figure 2 is a schematic structural diagram of the zoom lens assembly of Example 1 of the present application when it is in an intermediate state;

[0030] Figure 3 is a schematic structural diagram of the zoom lens assembly of Example 1 of the present application when it is in a telephoto state;

[0031] FIG. 4A to FIG. 4C They are respectively the axial chromatic aberration curve, the astigmatism curve and the distortion curve of the zoom lens group of Example 1 when it is in a wide-angle state;

[0032] FIG. 5A to FIG. 5C They are respectively the axial chromatic aberration curve, the astigmatism curve and the distortion curve when the zoom lens group of Example 1 is in the middle state;

[0033] FIG. 6A to FIG. 6C They are respectively the axial chromatic aberration curve, the astigmatism curve and the distortion curve of the zoom lens group of Example 1 when it is in the telephoto state;

[0034] Figure 7 This is a schematic structural diagram of the zoom lens assembly of Embodiment 2 of the present application when it is in a wide-angle state;

[0035] Figure 8 is a schematic structural diagram of a zoom lens assembly in Example 2 of the present application when it is in an intermediate state;

[0036] Fig. 9 is a schematic structural diagram of the zoom lens assembly of Example 2 of the present application when it is in a telephoto state;

[0037] FIG. 10A to FIG. 10C They are respectively the axial chromatic aberration curve, the astigmatism curve and the distortion curve of the zoom lens group of Example 2 when it is in a wide-angle state;

[0038] FIG. 11A to FIG. 11C They are respectively the axial chromatic aberration curve, the astigmatism curve and the distortion curve when the zoom lens group of Example 2 is in the middle state;

[0039] FIG. 12A to FIG. 12C They are respectively the axial chromatic aberration curve, the astigmatism curve and the distortion curve of the zoom lens group of Example 2 when it is in the telephoto state;

[0040] Fig.13 This is a schematic structural diagram of the zoom lens assembly of Example 3 of the present application when it is in a wide-angle state;

[0041] Fig.14 is a schematic structural diagram of a zoom lens assembly in Example 3 of the present application when it is in an intermediate state;

[0042] Fig.15 is a schematic structural diagram of a zoom lens assembly in Embodiment 3 of the present application when it is in a telephoto state;

[0043] FIG. 16A to FIG. 16C They are respectively the axial chromatic aberration curve, the astigmatism curve and the distortion curve of the zoom lens group of Example 3 when it is in a wide-angle state;

[0044] FIG. 17A to FIG. 17C They are respectively the axial chromatic aberration curve, the astigmatism curve and the distortion curve when the zoom lens group of Example 3 is in the middle state;

[0045] 18A to 18C They are respectively the axial chromatic aberration curve, the astigmatism curve and the distortion curve of the zoom lens group of Example 3 when it is in the telephoto state;

[0046] Fig.19 This is a schematic structural diagram of the zoom lens assembly of Example 4 of the present application when it is in a wide-angle state;

[0047] Fig. 20 is a structural schematic diagram of a zoom lens assembly in Example 4 of the present application when it is in an intermediate state;

[0048] Fig.21 is a schematic structural diagram of a zoom lens assembly in Embodiment 4 of the present application when it is in a telephoto state;

[0049] FIG. 22A to FIG. 22C They are respectively the axial chromatic aberration curve, the astigmatism curve and the distortion curve of the zoom lens group of Example 4 when it is in a wide-angle state;

[0050] FIG. 23A to FIG. 23C They are respectively the axial chromatic aberration curve, the astigmatism curve and the distortion curve when the zoom lens group of Example 4 is in the middle state;

[0051] FIG. 24A to FIG. 24C They are respectively an axial chromatic aberration curve, an astigmatism curve and a distortion curve of the zoom lens group of Example 4 when it is in a telephoto state;

[0052] Fig.25 is a schematic structural diagram of the zoom lens assembly of Example 5 of the present application when it is in a wide-angle state;

[0053] Fig.26 is a structural schematic diagram of a zoom lens assembly in Example 5 of the present application when it is in an intermediate state;

[0054] Fig. 27 is a schematic structural diagram of a zoom lens assembly according to Embodiment 5 of the present application when it is in a telephoto state;

[0055] FIG. 28A to FIG. 28C They are respectively the axial chromatic aberration curve, the astigmatism curve and the distortion curve of the zoom lens group of Example 5 when it is in a wide-angle state;

[0056] FIG. 29A to FIG. 29C They are respectively the axial chromatic aberration curve, the astigmatism curve and the distortion curve when the zoom lens group of Example 5 is in the middle state;

[0057] FIG. 30A to FIG. 30C They are respectively the axial chromatic aberration curve, the astigmatism curve and the distortion curve of the zoom lens group of Example 5 when it is in the telephoto state. DETAILED DESCRIPTION

[0058] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0059] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0060] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when 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. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0061] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0062] In the description of the present invention, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface 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 position of the concave surface 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 object is called the object side of the lens, and the surface of each lens closest to the imaging plane is called the image side of the lens.

[0063] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal way unless explicitly defined in this article.

[0064] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The features, principles and other aspects of the present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0065] Exemplary Embodiments

[0066] The present invention provides a zoom lens group, which includes: a first lens group, a second lens group and a third lens group in order from the object side to the image side along the optical axis. The first lens group includes a first lens. The second lens group includes an aperture, a second lens with positive focal power, a third lens, a fourth lens with negative focal power, and a fifth lens in order along the optical axis. The third lens group includes a sixth lens and a seventh lens with positive focal power in order along the optical axis. The lenses are not attached to each other, and the third lens group moves along the optical axis with the second lens group.

[0067] In this exemplary embodiment, by allocating different lenses to different parts, the optical lens group can show good imaging quality at different focal lengths. By reasonably allocating the focal power of the second lens and the fourth lens in the second lens group, the system can have smaller axial aberrations. By reasonably allocating the focal power of the sixth lens in the third lens group, the system aberrations can be balanced, so that the system has better imaging quality.

[0068] In this exemplary embodiment, the radius of curvature R4 of the image side of the second lens and the effective focal length f2 of the second lens satisfy: 1.3<|R4 / f2|<6.6. By controlling the ratio of the radius of curvature of the image side of the second lens to the effective focal length within a certain range, the deflection angle of the off-axis field light in the second lens can be controlled, thereby increasing the degree of matching with the chip. Specifically, the radius of curvature R4 of the image side of the second lens and the effective focal length f2 of the second lens satisfy: 1.31≤|R4 / f2|≤6.59, for example, 2.18≤|R4 / f2|≤5.14, 3.00≤|R4 / f2|≤5.00.

[0069] In this exemplary embodiment, the maximum field of view angle |FOV W |Satisfy: 20°<|FOV W |<55°. This conditional expression constrains the viewing angle of the zoom imaging lens group, so that the zoom lens group still has a good imaging range at different zoom magnifications. Specifically, the maximum field of view angle |FOV of the zoom lens group at different zoom magnifications is W |Satisfy: 20.1°≤|FOV W |≤54.5°, for example, 21.2°≤|FOV W |≤54.1°21.9°≤|FOV W |≤50.9°.

[0070] In the present exemplary embodiment, the effective focal length f1 of the first lens, the curvature radius R1 of the object side surface of the first lens, and the curvature radius R2 of the image side surface of the first lens satisfy: 19.0 < R1 / f1 * R2 < 22.0. Satisfying this conditional expression can improve the field curvature and distortion of the zoom imaging lens group, and at the same time control the processing difficulty of the first lens. Specifically, the effective focal length f1 of the first lens, the curvature radius R1 of the object side surface of the first lens, and the curvature radius R2 of the image side surface of the first lens satisfy: 19.80 ≤ R1 / f1 * R2 ≤ 21.05, 20.86 ≤ R1 / f1 * R2 ≤ 20.17.

[0071] In the present exemplary embodiment, the effective focal length f2 of the second lens and the effective focal length f6 of the sixth lens satisfy: 1.0 < f6 / f2 < 2.0. Satisfying this conditional expression is beneficial to better balance the aberration of the zoom imaging lens group and is also beneficial to improving the resolution of the system. Specifically, the effective focal length f2 of the second lens and the effective focal length f6 of the sixth lens satisfy: 1.13 ≤ f6 / f2 ≤ 1.87, 1.38 ≤ f6 / f2 ≤ 1.59.

[0072] In the present exemplary embodiment, the total focal length f of the zoom lens group at different zoom ratios W and the entrance pupil diameter EPD of the zoom lens group at different zoom ratios W satisfy: 2.0 < f W / EPD W < 4.5. By reasonably distributing the optical power of the zoom imaging lens group and restricting the entrance pupil diameter of the imaging system, the F number of the zoom imaging system is small, which can ensure that the system has a large aperture and also has good imaging quality in a dark environment. Specifically, the total focal length f of the zoom lens group at different zoom ratios W and the entrance pupil diameter EPD of the zoom lens group at different zoom ratios W satisfy: 2.26 ≤ f W / EPD W ≤ 4.38.

[0073] In the present exemplary embodiment, the curvature radius R4 of the image side surface of the second lens and the curvature radius R11 of the object side surface of the sixth lens satisfy: 1.5 < |R4 / R11| < 7.5. Reasonably controlling the ratio of the curvature radius of the image side surface of the second lens to the curvature radius of the object side surface of the sixth lens is beneficial to weakening the sensitivity of the system, is beneficial to achieving high-resolution characteristics, and at the same time ensures good processability. The curvature radius R4 of the image side surface of the second lens and the curvature radius R11 of the object side surface of the sixth lens satisfy: 1.79 ≤ |R4 / R11| ≤ 7.20, 2.44 ≤ |R4 / R11| ≤ 5.74.

[0074] In the present exemplary embodiment, the effective focal length f4 of the fourth lens, the effective focal length f5 of the fifth lens, and the effective focal length f7 of the seventh lens satisfy: 1.5 < (f4 - f5) / f7 < 5.5. Reasonably allocating the effective focal lengths of the fourth lens, the fifth lens, and the seventh lens is conducive to better balancing the aberration of the zoom imaging lens group and improving the resolution of the system. Specifically, the effective focal length f4 of the fourth lens, the effective focal length f5 of the fifth lens, and the effective focal length f7 of the seventh lens satisfy: 1.86 ≤ (f4 - f5) / f7 ≤ 5.13, 2.07 ≤ (f4 - f5) / f7 < 4.87.

[0075] In the present exemplary embodiment, the effective focal length f6 of the sixth lens and the radius of curvature R11 of the object side surface of the sixth lens satisfy: -2.5 < f6 / R11 < -1.5. Satisfying this conditional expression can improve the field curvature and distortion of the zoom imaging lens group and control the processing difficulty of the sixth lens. Specifically, the effective focal length f6 of the sixth lens and the radius of curvature R11 of the object side surface of the sixth lens satisfy: -2.09 ≤ f6 / R11 ≤ -1.54, -1.78 ≤ f6 / R11 ≤ -1.55.

[0076] In the present exemplary embodiment, the radius of curvature R12 of the image side surface of the sixth lens and the radius of curvature R13 of the object side surface of the seventh lens satisfy: 1.5 < R13 / R12 < 2.0. By reasonably controlling the ratio of the radius of curvature of the image side surface of the sixth lens to the radius of curvature of the object side surface of the seventh lens, the axial aberration generated by the zoom lens group can be effectively balanced. Specifically, the radius of curvature R12 of the image side surface of the sixth lens and the radius of curvature R13 of the object side surface of the seventh lens satisfy: 1.65 ≤ R13 / R12 ≤ 1.69.

[0077] In the present exemplary embodiment, the on-axis distance TTL from the object side surface of the first lens to the imaging surface, the central thickness CT1 of the first lens on the optical axis, and the central thickness CT2 of the second lens on the optical axis satisfy: 14.5 < TTL / (CT1 + CT4) < 20.5. With a reasonable size layout, a large aperture and high resolution are achieved while reducing the height and making it thinner. Specifically, the on-axis distance TTL from the object side surface of the first lens to the imaging surface, the central thickness CT1 of the first lens on the optical axis, and the central thickness CT2 of the second lens on the optical axis satisfy: 14.96 ≤ TTL / (CT1 + CT4) ≤ 20.13, 15.37 ≤ TTL / (CT1 + CT4) ≤ 19.86.

[0078] In this exemplary embodiment, the central thickness CT2 of the second lens on the optical axis and the central thickness CT3 of the third lens on the optical axis satisfy: 1.5 < CT2 / CT3 < 4.0. By reasonably allocating the central thicknesses of the second lens and the third lens, the lens is easy to be injection-molded, the processability of the imaging system is improved, and good imaging quality is ensured at the same time. Specifically, the central thickness CT2 of the second lens on the optical axis and the central thickness CT3 of the third lens on the optical axis satisfy: 1.78 < CT2 / CT3 ≤ 3.59, 1.86 < CT2 / CT3 ≤ 3.14.

[0079] In this exemplary embodiment, the central thickness CT6 of the sixth lens on the optical axis and the central thickness CT7 of the seventh lens on the optical axis satisfy: 2.0 < CT6 / CT7 < 4.0. By reasonably allocating the central thicknesses of the sixth lens and the seventh lens, the lens is easy to be injection-molded, the processability of the zoom lens group is improved, and good imaging quality is ensured at the same time. Specifically, the central thickness CT6 of the sixth lens on the optical axis and the central thickness CT7 of the seventh lens on the optical axis satisfy: 2.28 ≤ CT6 / CT7 ≤ 3.84, 3.29 ≤ CT6 / CT7 ≤ 3.50.

[0080] In this exemplary embodiment, the Abbe number V3 of the third lens and the Abbe number V4 of the fourth lens satisfy: V3 - V4 < 5.0. By reasonably controlling the Abbe numbers of the third lens and the fourth lens, the sensitivity of light to the two lenses can be reduced, and the zoom imaging lens group can have better imaging quality. Specifically, the Abbe number V3 of the third lens and the Abbe number V4 of the fourth lens satisfy: V3 - V4 ≤ 4.40.

[0081] In this exemplary embodiment, the air interval D1 on the optical axis between the surface closest to the image side of the first lens group at different zoom ratios and the diaphragm and the air interval D2 on the optical axis between the surface closest to the image side of the second lens group at different zoom ratios and the surface closest to the object side of the third lens group at different zoom ratios satisfy: 2.5 < D1 / D2 < 23.0. By reasonably controlling the ratio of D1 and D2, it is beneficial to slow down the degree of light deflection at different focal lengths, and the imaging quality of the zoom imaging lens group at different focal lengths can be ensured. Specifically, the air interval D1 on the optical axis between the surface closest to the image side of the first lens group at different zoom ratios and the diaphragm and the air interval D2 on the optical axis between the surface closest to the image side of the second lens group at different zoom ratios and the surface closest to the object side of the third lens group at different zoom ratios satisfy: 2.88 ≤ D1 / D2 ≤ 22.82.

[0082] In this exemplary embodiment, the total focal length f of the zoom lens group at different zoom ratios W and the air interval D3 on the optical axis between the surface closest to the image side of the third lens group at different zoom ratios and the filter satisfy 1.5 < fW / D3<13.0. By controlling the ratio of the total focal length to the air gap between the surface closest to the image side at the telephoto end and the filter on the optical axis, it is helpful to reduce the aberration of the telephoto end lens and make it have better imaging quality. Specifically, the total focal length f of the zoom lens group at different zoom factors W The air gap D3 between the surface closest to the image side of the third lens group and the filter on the optical axis at different zoom factors satisfies 1.95≤f W / D3≤12.67,2.08≤f W / D3≤11.22.

[0083] In an exemplary embodiment, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the mirror surfaces from the object side of the first lens to the image side of the seventh lens is an aspherical mirror surface. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting an aspherical lens, the aberration occurring during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, at least one of the object side and image side of each lens in the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens is an aspherical mirror surface. Optionally, the object side and image side of each lens in the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all aspherical mirror surfaces. Specific embodiment 1

[0085] The following reference Figures 1 to 6C A zoom lens group according to Embodiment 1 of the present application is described. Figure 1 A schematic structural diagram of the zoom lens group of Example 1 of the present application when in a wide-angle state is shown. Figure 2 A schematic structural diagram of the zoom lens group in Example 1 of the present application when it is in an intermediate state is shown. Figure 3 A schematic structural diagram of the zoom lens group of Example 1 of the present application when in a telephoto state is shown.

[0086] like Figures 1 to 3 As shown, the zoom lens group includes, from the object side to the image side along the optical axis, a first lens group G1 (first lens E1), a second lens group G2 (second lens E2, third lens E3, fourth lens E4 and fifth lens E5), a third lens group G3 (sixth lens E6 and seventh lens E7), and a filter E8. The zoom lens group also includes a stop STO, which is disposed between the first lens E1 of the first lens group G1 and the second lens E2 of the second lens group G2.

[0087] The first lens E1 has a negative focal power, its object side S1 is concave, and its image side S2 is concave. The second lens E2 has a positive focal power, its object side S3 is convex, and its image side S4 is concave. The third lens E3 has a positive focal power, its object side S5 is convex, and its image side S6 is concave. The fourth lens E4 has a negative focal power, its object side S7 is concave, and its image side S8 is concave. The fifth lens E5 has a positive focal power, its object side S9 is convex, and its image side S10 is convex. The sixth lens E6 has a positive focal power, its object side S11 is concave, and its image side S12 is convex. The seventh lens E7 has a negative focal power, its object side S13 is concave, and its image side S14 is concave. The filter E9 has an object side S15 and an image side S16. Light from the object sequentially passes through the surfaces S1 to S16 and finally forms an image on the imaging surface S17.

[0088] The camera lens group in Embodiment 1 satisfies:

[0089] 1.3 < |R4 / f2| < 6.6, where R4 is the radius of curvature of the image side of the second lens, and f2 is the effective focal length of the second lens.

[0090] 20° < |FOV W | < 55°, where |FOV W | is the maximum field of view angle at different zoom ratios of the zoom lens group.

[0091] 19.0 < R1 / f1 * R2 < 22.0, where f1 is the effective focal length of the first lens, R1 is the radius of curvature of the object side of the first lens, and R2 is the radius of curvature of the image side of the first lens.

[0092] 1.0 < f6 / f2 < 2.0, where f2 is the effective focal length of the second lens, and f6 is the effective focal length of the sixth lens.

[0093] 2.0 < f W / EPD W < 4.5, where f W is the total focal length at different zoom ratios of the zoom lens group, and EPD W is the entrance pupil diameter at different zoom ratios.

[0094] 1.5 < |R4 / R11| < 7.5, where R4 is the radius of curvature of the image side of the second lens, and R11 is the radius of curvature of the object side of the sixth lens.

[0095] 1.5 < (f4 - f5) / f7 < 5.5, where f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, and f7 is the effective focal length of the seventh lens.

[0096] -2.5 < f6 / R11 < -1.5, where f6 is the effective focal length of the sixth lens and R11 is the curvature radius of the object side surface of the sixth lens.

[0097] 1.5 < R13 / R12 < 2.0, where R12 is the curvature radius of the image side surface of the sixth lens and R13 is the curvature radius of the object side surface of the seventh lens.

[0098] 14.5 < TTL / (CT1 + CT4) < 20.5, where TTL is the on-axis distance from the object side surface of the first lens to the imaging surface, CT1 is the central thickness of the first lens on the optical axis, and CT2 is the central thickness of the second lens on the optical axis.

[0099] 1.5 < CT2 / CT3 < 4.0, where CT2 is the central thickness of the second lens on the optical axis and CT3 is the central thickness of the third lens on the optical axis.

[0100] 2.0 < CT6 / CT7 < 4.0, where CT6 is the central thickness of the sixth lens on the optical axis and CT7 is the central thickness of the seventh lens on the optical axis.

[0101] V3 - V4 < 5.0, where V3 is the Abbe number of the third lens and V4 is the Abbe number of the fourth lens.

[0102] 2.5 < D1 / D2 < 23.0, where D1 is the air space on the optical axis between the surface closest to the image side in the first group and the diaphragm at different zoom ratios, and D2 is the air space on the optical axis between the surface closest to the image side in the second group and the surface closest to the object side in the third group at different zoom ratios.

[0103] 1.5 < f W / D3 < 13.0, where f W is the total focal length of the zoom lens group at different zoom ratios, and D3 is the air space on the optical axis between the surface closest to the image side in the third group and the filter at different zoom ratios.

[0104] As shown in Table 1, it is the basic parameter table of the optical imaging lens of Example 1, where the units of the curvature radius, thickness, and focal length are all millimeters (mm).

[0105]

[0106]

[0107] Table 1

[0108] In Examples 1 - 5, the object side surface S1 of the first lens E1 to the object side surface S9 of the fifth lens E5 are all aspherical surfaces. The surface shape x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0109]

[0110] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R (i.e., the paraxial curvature c is the reciprocal of the curvature radius R in Table 1); k is the cone coefficient; Ai is the correction coefficient of the i-th order aspheric surface.

[0111] In Example 1, the object side surface and the image side surface of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 2 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A5 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0112] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -9.3624E-02 2.5547E-02 -1.0912E-03 8.3260E-04 -6.1242E-05 -4.8564E-05 -2.3317E-06 -5.4302E-06 1.1315E-07 S2 -1.0458E-03 1.3769E-02 1.3279E-03 6.8058E-04 8.5456E-05 -3.5339E-05 -3.8470E-06 -2.6235E-06 -7.9609E-06 S3 8.5044E-03 9.6421E-04 -6.2266E-04 -2.0048E-04 -5.8740E-05 -9.7359E-06 -1.7282E-06 2.6613E-06 -5.5715E-07 S4 1.9396E-02 4.5289E-04 -1.8340E-03 -1.7090E-05 -1.5692E-04 2.0849E-06 2.8901E-05 3.2130E-05 -7.7188E-06 S5 3.5720E-03 1.8219E-03 5.8859E-04 4.7805E-05 -1.7268E-04 2.5591E-07 3.0322E-05 3.0112E-05 -5.6524E-06 S6 -3.2893E-03 5.0245E-03 1.4482E-03 -1.0880E-04 -7.2740E-05 6.4890E-06 1.1269E-05 8.6138E-06 2.4441E-06 S7 2.4628E-02 -1.1889E-02 8.7919E-04 -5.2619E-04 5.2555E-05 1.2029E-05 4.5530E-06 3.9586E-06 -1.9688E-07 S8 7.0207E-02 -6.4358E-03 -1.4508E-04 -6.5423E-04 2.7069E-05 4.4905E-05 1.9086E-07 1.1477E-05 -3.0130E-06 S9 -1.0429E-02 1.5356E-02 -1.5949E-04 1.9562E-04 -5.8311E-05 3.5539E-05 -9.2518E-06 1.1978E-05 -3.6015E-06 S10 3.3581E-02 1.6150E-02 4.2420E-03 8.3583E-04 9.5518E-05 -3.6778E-05 7.1070E-06 2.9546E-06 6.9991E-06 S11 1.3148E-01 -6.4958E-04 1.2056E-03 -5.4428E-04 -2.5782E-04 -1.3698E-04 1.5730E-05 1.7246E-05 2.1768E-05 S12 1.7230E-01 3.7768E-03 9.7613E-03 3.0540E-03 9.1340E-04 1.3996E-04 -1.2324E-04 -1.1111E-04 -1.5545E-05 S13 -3.5817E-01 1.0526E-01 -5.4737E-03 8.0315E-03 -2.9779E-04 7.9780E-04 -1.8215E-04 -6.0618E-05 2.8515E-06 S14 -3.0883E-01 9.0049E-02 -1.9227E-02 6.1392E-03 -2.0675E-03 7.4524E-04 -2.8448E-04 8.9556E-05 -2.0029E-05

[0113] Table 2

[0114] In this example, the zoom lens group is switched to the wide-angle state, the intermediate state and the telephoto state by changing the spacing distance D1 on the optical axis between the first lens group and the second lens group (i.e., the spacing distance on the optical axis from the image side surface S2 of the first lens E1 to the object side surface S3 of the second lens E2), the spacing distance D2 on the optical axis between the second lens group and the third lens group (i.e., the spacing distance on the optical axis from the image side surface S10 of the fifth lens E5 to the object side surface S11 of the sixth lens E6), and the spacing distance D3 on the optical axis between the third lens group and the filter E8 (i.e., the spacing distance on the optical axis from the image side surface S14 of the seventh lens E7 to the object side surface S16 of the filter E8).

[0115] The total focal length f of the zoom lens group at different zoom factors W , the total focal length f of the zoom lens group at different zoom factors W Entrance pupil diameter EPD of zoom lens group at different zoom factors W The ratio f W / EPD W , and the maximum field of view of the zoom lens group at different zoom factors | FOV W |Changes as the zoom lens group switches between wide-angle, intermediate and telephoto positions.

[0116] Table 3 shows the parameters of Example 1 that change with different states of the zoom lens group, where f W The units of D1, D2, and D3 are all millimeters (mm), and the unit of FOV is degrees (°).

[0117]

[0118] Table 3

[0119] In Example 1, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S17 of the optical imaging lens is 14.72 mm, and the half of the diagonal length of the effective pixel area on the imaging surface S17 is ImgH=2.67 mm. The parameters of each relational expression are explained in the exemplary embodiment, and the values ​​of each relational expression are listed in Table 4 below.

[0120]

[0121] Table 4

[0122] Figure 4A , Figure 5A , Fig. 6A The axial chromatic aberration curves of the zoom lens group of Example 1 when in the wide-angle state, the intermediate state and the telephoto state are respectively shown, which indicate the deviation of the focusing point of light rays of different wavelengths passing through the back of the lens. Figure 4B , Figure 5B , Figure 6B Astigmatism curves are shown when the zoom lens group of Example 1 is in a wide-angle state, a middle state, and a telephoto state, respectively, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 4C , Figure 5C , Figure 6C The distortion curves of the zoom lens group of Example 1 when in the wide-angle state, the intermediate state and the telephoto state are shown respectively, which represent the distortion magnitude values ​​corresponding to different image heights. 4A to 6C It can be seen that the zoom lens set provided in Example 1 can achieve good imaging quality in all states. Specific embodiment 2

[0124] The following reference Figures 7 to 12C A zoom lens group according to Embodiment 2 of the present application is described. Figure 7 A schematic structural diagram of the zoom lens group of Example 2 of the present application when in a wide-angle state is shown. Figure 8 A schematic structural diagram of the zoom lens group of Example 2 of the present application when it is in an intermediate state is shown. Fig. 9 A schematic diagram of the structure of the zoom lens group of Example 3 of the present application when in a telephoto state is shown.

[0125] like Figures 7 to 9As shown, the zoom lens group includes, from the object side to the image side along the optical axis, a first lens group G1 (first lens E1), a second lens group G2 (second lens E2, third lens E3, fourth lens E4 and fifth lens E5), a third lens group G3 (sixth lens E6 and seventh lens E7), and a filter E8. The zoom lens group also includes a stop STO, which is disposed between the first lens E1 of the first lens group G1 and the second lens E2 of the second lens group G2.

[0126] The first lens E1 has negative power, and its object side surface S1 is concave, and its image side surface S2 is concave. The second lens E2 has positive power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive power, and its object side surface S5 is convex, and its image side surface S6 is concave. The fourth lens E4 has negative power, and its object side surface S7 is convex, and its image side surface S8 is concave. The fifth lens E5 has positive power, and its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has positive power, and its object side surface S11 is concave, and its image side surface S12 is convex. The seventh lens E7 has negative power, and its object side surface S13 is concave, and its image side surface S14 is concave. The filter E9 has an object side surface S15 and an image side surface S16. The light from the object passes through each surface S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0127] As shown in Table 5, it is a basic parameter table of the optical imaging lens of Example 2, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0128]

[0129]

[0130] Table 5

[0131] In Example 2, the object side surface and the image side surface of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 6 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A5 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0132]

[0133]

[0134] Table 6

[0135] In this example, the zoom lens group is switched to the wide-angle state, the intermediate state and the telephoto state by changing the spacing distance D1 on the optical axis between the first lens group and the second lens group (i.e., the spacing distance on the optical axis from the image side surface S2 of the first lens E1 to the object side surface S3 of the second lens E2), the spacing distance D2 on the optical axis between the second lens group and the third lens group (i.e., the spacing distance on the optical axis from the image side surface S10 of the fifth lens E5 to the object side surface S11 of the sixth lens E6), and the spacing distance D3 on the optical axis between the third lens group and the filter E8 (i.e., the spacing distance on the optical axis from the image side surface S14 of the seventh lens E7 to the object side surface S16 of the filter E8).

[0136] The total focal length f of the zoom lens group at different zoom factors W , the total focal length f of the zoom lens group at different zoom factors W Entrance pupil diameter EPD of zoom lens group at different zoom factors W The ratio f W / EPD W , and the maximum field of view of the zoom lens group at different zoom factors | FOV W |Changes as the zoom lens group switches between wide-angle, intermediate and telephoto positions.

[0137] Table 7 shows the parameters of Example 2 that vary with different states of the zoom lens group, where f W The units of D1, D2, and D3 are all millimeters (mm), and the unit of FOV is degrees (°).

[0138]

[0139] Table 7

[0140] In Example 2, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S17 of the optical imaging lens is 13.91 mm, and half of the diagonal length of the effective pixel area on the imaging surface S17 is ImgH=2.67 mm. The parameters of each relational expression are explained in the exemplary embodiment, and the values ​​of each relational expression are listed in Table 8 below.

[0141]

[0142]

[0143] Table 8

[0144] Fig. 10A , Fig.11A , Fig. 12AThe axial chromatic aberration curves of the zoom lens group of Example 2 when in the wide-angle state, the intermediate state and the telephoto state are respectively shown, which indicate that light rays of different wavelengths deviate from the focal point behind the lens. Fig. 10B , Fig. 11B , Fig. 12B The astigmatism curves of the zoom lens group of Example 2 when in the wide-angle state, the intermediate state and the telephoto state are respectively shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Fig. 10C , Fig. 11C , Fig. 12C The distortion curves of the zoom lens group of Example 2 when in the wide-angle state, the intermediate state and the telephoto state are shown respectively, which represent the distortion magnitude values ​​corresponding to different image heights. FIG. 10A to FIG. 12C It can be seen that the zoom lens set provided in Example 2 can achieve good imaging quality in all states. Specific embodiment 3

[0146] The following reference Figures 13 to 18C A zoom lens group according to Embodiment 3 of the present application is described. Fig.13 A schematic structural diagram of the zoom lens group of Example 3 of the present application when in a wide-angle state is shown. Fig.14 A schematic structural diagram of the zoom lens group of Example 3 of the present application when it is in an intermediate state is shown. Fig.15 A schematic diagram of the structure of the zoom lens group of Example 3 of the present application when in a telephoto state is shown.

[0147] like Figures 13 to 15 As shown, the zoom lens group includes, from the object side to the image side along the optical axis, a first lens group G1 (first lens E1), a second lens group G2 (second lens E2, third lens E3, fourth lens E4 and fifth lens E5), a third lens group G3 (sixth lens E6 and seventh lens E7), and a filter E8. The zoom lens group also includes a stop STO, which is disposed between the first lens E1 of the first lens group G1 and the second lens E2 of the second lens group G2.

[0148] The first lens E1 has negative power, and its object side surface S1 is concave, and its image side surface S2 is concave. The second lens E2 has positive power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive power, and its object side surface S5 is concave, and its image side surface S6 is convex. The fourth lens E4 has negative power, and its object side surface S7 is concave, and its image side surface S8 is concave. The fifth lens E5 has positive power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has positive power, and its object side surface S11 is concave, and its image side surface S12 is convex. The seventh lens E7 has negative power, and its object side surface S13 is concave, and its image side surface S14 is concave. The filter E9 has an object side surface S15 and an image side surface S16. The light from the object passes through each surface S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0149] As shown in Table 9, it is a basic parameter table of the optical imaging lens of Example 3, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0150]

[0151] Table 9

[0152] In Example 3, the object side surface and the image side surface of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 10 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0153] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -9.3624E-02 2.5547E-02 -1.0912E-03 8.3260E-04 -6.1242E-05 -4.8564E-05 -2.3317E-06 -5.4302E-06 1.1315E-07 S2 -1.0458E-03 1.3769E-02 1.3279E-03 6.8058E-04 8.5456E-05 -3.5339E-05 -3.8470E-06 -2.6235E-06 -7.9609E-06 S3 8.5044E-03 9.6421E-04 -6.2266E-04 -2.0048E-04 -5.8740E-05 -9.7359E-06 -1.7282E-06 2.6613E-06 -5.5715E-07 S4 1.9396E-02 4.5289E-04 -1.8340E-03 -1.7090E-05 -1.5692E-04 2.0849E-06 2.8901E-05 3.2130E-05 -7.7188E-06 S5 3.5720E-03 1.8219E-03 5.8859E-04 4.7805E-05 -1.7268E-04 2.5591E-07 3.0322E-05 3.0112E-05 -5.6524E-06 S6 -3.2893E-03 5.0245E-03 1.4482E-03 -1.0880E-04 -7.2740E-05 6.4890E-06 1.1269E-05 8.6138E-06 2.4441E-06 S7 2.4628E-02 -1.1889E-02 8.7919E-04 -5.2619E-04 5.2555E-05 1.2029E-05 4.5530E-06 3.9586E-06 -1.9688E-07 S8 7.0207E-02 -6.4358E-03 -1.4508E-04 -6.5423E-04 2.7069E-05 4.4905E-05 1.9086E-07 1.1477E-05 -3.0130E-06 S9 -1.0429E-02 1.5356E-02 -1.5949E-04 1.9562E-04 -5.8311E-05 3.5539E-05 -9.2518E-06 1.1978E-05 -3.6015E-06 S10 3.3581E-02 1.6150E-02 4.2420E-03 8.3583E-04 9.5518E-05 -3.6778E-05 7.1070E-06 2.9546E-06 6.9991E-06 S11 1.3148E-01 -6.4958E-04 1.2056E-03 -5.4428E-04 -2.5782E-04 -1.3698E-04 1.5730E-05 1.7246E-05 2.1768E-05 S12 1.7230E-01 3.7768E-03 9.7613E-03 3.0540E-03 9.1340E-04 1.3996E-04 -1.2324E-04 -1.1111E-04 -1.5545E-05 S13 -3.5817E-01 1.0526E-01 -5.4737E-03 8.0315E-03 -2.9779E-04 7.9780E-04 -1.8215E-04 -6.0618E-05 2.8515E-06 S14 -3.0883E-01 9.0049E-02 -1.9227E-02 6.1392E-03 -2.0675E-03 7.4524E-04 -2.8448E-04 8.9556E-05 -2.0029E-05

[0154] Table 10

[0155] In this example, the zoom lens group is switched to the wide-angle state, the intermediate state and the telephoto state by changing the spacing distance D1 on the optical axis between the first lens group and the second lens group (i.e., the spacing distance on the optical axis from the image side surface S2 of the first lens E1 to the object side surface S3 of the second lens E2), the spacing distance D2 on the optical axis between the second lens group and the third lens group (i.e., the spacing distance on the optical axis from the image side surface S10 of the fifth lens E5 to the object side surface S11 of the sixth lens E6), and the spacing distance D3 on the optical axis between the third lens group and the filter E8 (i.e., the spacing distance on the optical axis from the image side surface S14 of the seventh lens E7 to the object side surface S16 of the filter E8).

[0156] The total focal length f of the zoom lens group at different zoom factors W, the total focal length f of the zoom lens group at different zoom factors W Entrance pupil diameter EPD of zoom lens group at different zoom factors W The ratio f W / EPD W , and the maximum field of view of the zoom lens group at different zoom factors | FOV W |Changes as the zoom lens group switches between wide-angle, intermediate and telephoto positions.

[0157] Table 11 shows the parameters of Example 3 that vary with different states of the zoom lens group, where f W The units of D1, D2, and D3 are all millimeters (mm), and the unit of FOV is degrees (°).

[0158]

[0159] Table 11

[0160] In Example 3, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S17 of the optical imaging lens is 14.54 mm, and half of the diagonal length of the effective pixel area on the imaging surface S17 is ImgH=2.67 mm. The parameters of each relational expression are explained in the exemplary embodiment, and the values ​​of each relational expression are listed in Table 12 below.

[0161]

[0162]

[0163] Table 12

[0164] Fig.16A , Fig.17A , Fig.18A The axial chromatic aberration curves of the zoom lens group of Example 3 when in the wide-angle state, the intermediate state and the telephoto state are respectively shown, which indicate that light rays of different wavelengths deviate from the focal point behind the lens. Fig. 16B , Fig. 17B , Fig.18B The astigmatism curves of the zoom lens group of Example 3 when in the wide-angle state, the intermediate state and the telephoto state are respectively shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Fig. 16C , Fig. 17C , Fig.18C The distortion curves of the zoom lens group of Example 3 when in the wide-angle state, the intermediate state and the telephoto state are shown respectively, which represent the distortion magnitude values ​​corresponding to different image heights. FIG. 16A to FIG. 18C It can be seen that the zoom lens group provided in Example 3 can achieve good imaging quality in all states. Specific embodiment 4

[0166] The following reference Figures 19 to 24C A zoom lens group according to Embodiment 4 of the present application is described. Fig.19 A schematic structural diagram of the zoom lens group of Example 4 of the present application when in a wide-angle state is shown. Fig. 20 A schematic structural diagram of the zoom lens group of Example 4 of the present application when it is in an intermediate state is shown. Fig.21 A schematic structural diagram of the zoom lens group of Example 4 of the present application when in a telephoto state is shown.

[0167] like Figures 19 to 21 As shown, the zoom lens group includes, from the object side to the image side along the optical axis, a first lens group G1 (first lens E1), a second lens group G2 (second lens E2, third lens E3, fourth lens E4 and fifth lens E5), a third lens group G3 (sixth lens E6 and seventh lens E7), and a filter E8. The zoom lens group also includes a stop STO, which is disposed between the first lens E1 of the first lens group G1 and the second lens E2 of the second lens group G2.

[0168] The first lens E1 has negative power, and its object side surface S1 is concave, and its image side surface S2 is concave. The second lens E2 has positive power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has positive power, and its object side surface S5 is concave, and its image side surface S6 is convex. The fourth lens E4 has negative power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has positive power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has positive power, and its object side surface S11 is concave, and its image side surface S12 is convex. The seventh lens E7 has negative power, and its object side surface S13 is concave, and its image side surface S14 is concave. The filter E9 has an object side surface S15 and an image side surface S16. The light from the object passes through each surface S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0169] As shown in Table 13, it is a basic parameter table of the optical imaging lens of Example 4, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0170]

[0171]

[0172] Table 13

[0173] In Example 4, the object side surface and the image side surface of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 14 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A 10 , A 12, A 14 , A 16 , A 18 and A 20 .

[0174]

[0175]

[0176] Table 14

[0177] In this example, the zoom lens group is switched to the wide-angle state, the intermediate state and the telephoto state by changing the spacing distance D1 on the optical axis between the first lens group and the second lens group (i.e., the spacing distance on the optical axis from the image side surface S2 of the first lens E1 to the object side surface S3 of the second lens E2), the spacing distance D2 on the optical axis between the second lens group and the third lens group (i.e., the spacing distance on the optical axis from the image side surface S10 of the fifth lens E5 to the object side surface S11 of the sixth lens E6), and the spacing distance D3 on the optical axis between the third lens group and the filter E8 (i.e., the spacing distance on the optical axis from the image side surface S14 of the seventh lens E7 to the object side surface S16 of the filter E8).

[0178] The total focal length f of the zoom lens group at different zoom factors W , the total focal length f of the zoom lens group at different zoom factors W Entrance pupil diameter EPD of zoom lens group at different zoom factors W The ratio f W / EPD W , and the maximum field of view of the zoom lens group at different zoom factors | FOV W |Changes as the zoom lens group switches between wide-angle, intermediate and telephoto positions.

[0179] Table 15 shows the parameters of Example 4 that vary with different states of the zoom lens group, where f W The units of D1, D2, and D3 are all millimeters (mm), and the unit of FOV is degrees (°).

[0180]

[0181] Table 15

[0182] In Example 4, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S17 of the optical imaging lens is 14.52 mm, and half of the diagonal length of the effective pixel area on the imaging surface S17 is ImgH=2.67 mm. The parameters of each relational expression are explained in the exemplary embodiment, and the values ​​of each relational expression are listed in Table 16 below.

[0183]

[0184]

[0185] Table 16

[0186] Fig.22A , Fig.23A , Fig.24A The axial chromatic aberration curves of the zoom lens group of Example 4 when in the wide-angle state, the intermediate state and the telephoto state are respectively shown, which indicate that light rays of different wavelengths deviate from the focal point behind the lens. Fig. 22B , Fig. 23B , Fig. 24B The astigmatism curves of the zoom lens group of Example 4 when in the wide-angle state, the intermediate state and the telephoto state are respectively shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Fig. 22C , Fig.23C , Fig.24C The distortion curves of the zoom lens group of Example 4 when in the wide-angle state, the intermediate state and the telephoto state are shown respectively, which represent the distortion magnitude values ​​corresponding to different image heights. FIG. 22A to FIG. 24C It can be seen that the zoom lens group provided in Example 4 can achieve good imaging quality in all states. Specific embodiment 5

[0188] The following reference Figures 25 to 30C A zoom lens group according to Example 5 of the present application is described. Fig.25 A schematic structural diagram of the zoom lens group of Example 5 of the present application when in a wide-angle state is shown. Fig.26 A schematic structural diagram of the zoom lens group of Example 5 of the present application when it is in an intermediate state is shown. Fig. 27 A schematic structural diagram of the zoom lens group of Example 5 of the present application when in a telephoto state is shown.

[0189] like Figure 25 to Figure 27 As shown, the zoom lens group includes, from the object side to the image side along the optical axis, a first lens group G1 (first lens E1), a second lens group G2 (second lens E2, third lens E3, fourth lens E4 and fifth lens E5), a third lens group G3 (sixth lens E6 and seventh lens E7), and a filter E8. The zoom lens group also includes a stop STO, which is disposed between the first lens E1 of the first lens group G1 and the second lens E2 of the second lens group G2.

[0190] The first lens E1 has negative power, and its object side surface S1 is concave, and its image side surface S2 is concave. The second lens E2 has positive power, and its object side surface S3 is convex, and its image side surface S4 is convex. The third lens E3 has negative power, and its object side surface S5 is concave, and its image side surface S6 is convex. The fourth lens E4 has negative power, and its object side surface S7 is concave, and its image side surface S8 is convex. The fifth lens E5 has positive power, and its object side surface S9 is convex, and its image side surface S10 is convex. The sixth lens E6 has positive power, and its object side surface S11 is concave, and its image side surface S12 is convex. The seventh lens E7 has negative power, and its object side surface S13 is concave, and its image side surface S14 is concave. The filter E9 has an object side surface S15 and an image side surface S16. The light from the object passes through each surface S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0191] As shown in Table 17, it is a basic parameter table of the optical imaging lens of Example 5, wherein the units of the radius of curvature, thickness, and focal length are all millimeters (mm).

[0192]

[0193] Table 17

[0194] In Example 5, the object side surface and the image side surface of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 18 shows the high-order coefficients A4, A6, A8, A9, A10, A11, A12, A13, A14, A15, A16, A17, A18, A19, A20, A21, A22, A23, A24, A25, A26, A27, A28, A29, A30, A31, A32, A33, A34, A35, A36, A37, A38, A39, A40, A41, A42, A43, A44, A45, A46, A47, A48, A49, A50, A51, A52, A53, A54, A55, A56, A57, A58, A 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0195]

[0196]

[0197] Table 18

[0198] In this example, the zoom lens group is switched to the wide-angle state, the intermediate state and the telephoto state by changing the spacing distance D1 on the optical axis between the first lens group and the second lens group (i.e., the spacing distance on the optical axis from the image side surface S2 of the first lens E1 to the object side surface S3 of the second lens E2), the spacing distance D2 on the optical axis between the second lens group and the third lens group (i.e., the spacing distance on the optical axis from the image side surface S10 of the fifth lens E5 to the object side surface S11 of the sixth lens E6), and the spacing distance D3 on the optical axis between the third lens group and the filter E8 (i.e., the spacing distance on the optical axis from the image side surface S14 of the seventh lens E7 to the object side surface S16 of the filter E8).

[0199] The total focal length f of the zoom lens group at different zoom factors W , the total focal length f of the zoom lens group at different zoom factors W Entrance pupil diameter EPD of zoom lens group at different zoom factors W The ratio f W / EPD W , and the maximum field of view of the zoom lens group at different zoom factors | FOV W |Changes as the zoom lens group switches between wide-angle, intermediate and telephoto positions.

[0200] Table 19 shows the parameters of Example 5 that vary with different states of the zoom lens group, where f W The units of D1, D2, and D3 are all millimeters (mm), and the unit of FOV is degrees (°).

[0201]

[0202] Table 19

[0203] In Example 5, the distance TTL on the optical axis from the object-side surface S1 of the first lens E1 to the imaging surface S17 of the optical imaging lens is 14.21 mm, and half of the diagonal length of the effective pixel area on the imaging surface S17 is ImgH=2.67 mm. The parameters of each relational expression are explained in the exemplary embodiment, and the values ​​of each relational expression are listed in Table 20 below.

[0204]

[0205] Table 20

[0206] Fig.28A , Fig.29A , Fig. 30A The axial chromatic aberration curves of the zoom lens group of Example 5 when in the wide-angle state, the intermediate state and the telephoto state are respectively shown, which indicate that light rays of different wavelengths deviate from the focal point behind the lens. Fig.28B , Fig.29B , Fig. 30B The astigmatism curves of the zoom lens group of Example 5 when in the wide-angle state, the intermediate state and the telephoto state are respectively shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Fig.28C , Fig.29C , Fig. 30C The distortion curves of the zoom lens group of Example 5 when in the wide-angle state, the intermediate state and the telephoto state are shown respectively, which represent the distortion magnitude values ​​corresponding to different image heights. FIG. 28A to FIG. 30C It can be seen that the zoom lens group provided in Example 5 can achieve good imaging quality in all states.

[0207] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, improvements, equivalent substitutions, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A zoom lens assembly, characterized in that: The zoom lens group has three lens groups, and the three lens groups include: A first lens group consisting of a first lens; The first lens has a negative optical power, and its object side surface is concave and its image side surface is concave; A second lens group, which is composed of, in order along the optical axis, an aperture stop, a second lens having positive refractive power, a third lens, a fourth lens having negative refractive power, and a fifth lens; a second lens having positive refractive power and a convex object-side surface; a third lens having positive or negative optical power; a fourth lens having negative optical power; a fifth lens element having positive refractive power and a convex object-side surface; and A third lens group, which is composed of a sixth lens and a seventh lens having positive refractive power in sequence along the optical axis; a sixth lens having positive refractive power, whose object side surface is concave and image side surface is convex; The seventh lens element has a negative optical power, and its object side surface is concave and its image side surface is concave; Among them, the lenses are not adhered to each other; The third lens group moves along the optical axis along with the second lens group; The curvature radius R4 of the image-side surface of the second lens and the effective focal length f2 of the second lens satisfy the following: 1.3<|R4 / f2|<6.

6.

2. The zoom lens assembly according to claim 1, characterized in that: The maximum field of view angle |FOV of the focal lens group at different zoom factors W |Satisfy: 20.1°≤|FOV W |≤54.5°.

3. The zoom lens assembly according to claim 1, wherein: The effective focal length f1 of the first lens, the curvature radius R1 of the object side surface of the first lens, and the curvature radius R2 of the image side surface of the first lens satisfy: 19.68≤R1 / f1*R2≤21.

05.

4. The zoom lens assembly according to claim 1, wherein: The effective focal length f2 of the second lens and the effective focal length f6 of the sixth lens satisfy: 1.13≤f6 / f2≤1.

87.

5. The zoom lens assembly according to claim 1, wherein: The total focal length f of the zoom lens group at different zoom factors W Entrance pupil diameter EPD at different zoom factors of the zoom lens group W Satisfies: 2.26≤f W / EPD W ≤4.

38.

6. The zoom lens assembly according to claim 1, wherein: A curvature radius R4 of the image-side surface of the second lens and a curvature radius R11 of the object-side surface of the sixth lens satisfy: 1.79≤|R4 / R11|≤7.

20.

7. The zoom lens assembly according to claim 1, wherein: The effective focal length f4 of the fourth lens, the effective focal length f5 of the fifth lens and the effective focal length f7 of the seventh lens satisfy: 1.86≤(f4-f5) / f7≤5.

13.

8. The zoom lens assembly according to claim 1, wherein: The effective focal length f6 of the sixth lens and the curvature radius R11 of the object side surface of the sixth lens satisfy: -2.09≤f6 / R11<-1.

5.

9. The zoom lens assembly according to claim 1, wherein: A curvature radius R12 of the image side surface of the sixth lens and a curvature radius R13 of the object side surface of the seventh lens satisfy: 1.63≤R13 / R12≤1.

69.

10. The zoom lens assembly according to claim 1, wherein: The on-axis distance TTL from the object side surface of the first lens to the imaging surface, the center thickness CT1 of the first lens on the optical axis, and the center thickness CT2 of the second lens on the optical axis satisfy: 14.96≤TTL / (CT1+CT4)≤20.

13.

11. The zoom lens assembly according to claim 1, wherein: A center thickness CT2 of the second lens on the optical axis and a center thickness CT3 of the third lens on the optical axis satisfy: 1.78≤CT2 / CT3≤3.

59.

12. The zoom lens assembly according to claim 1, wherein: A center thickness CT6 of the sixth lens on the optical axis and a center thickness CT7 of the seventh lens on the optical axis satisfy: 2.28≤CT6 / CT7≤3.

84.

13. The zoom lens assembly according to claim 1, wherein: The Abbe number V3 of the third lens and the Abbe number V4 of the fourth lens satisfy: V3-V4=4.

40.

14. The zoom lens assembly according to claim 1, wherein: An air gap D1 between the surface of the first lens group closest to the image side and the aperture on the optical axis at different zoom magnifications and an air gap D2 between the surface of the second lens group closest to the image side at different zoom magnifications and the surface of the third lens group closest to the object side at different zoom magnifications on the optical axis satisfy: 2.88≤D1 / D2≤22.

82.

15. The zoom lens assembly according to claim 1, wherein: The total focal length f of the zoom lens group at different zoom factors W The air gap D3 between the surface closest to the image side of the third lens group at different zoom factors and the filter on the optical axis satisfies: 1.95≤f W / D3≤12.67.

Images