A zoom lens set

Abstract

The present invention discloses a zoom lens group, which includes three parts along the optical axis from the object side to the image side: a first part, a front fixed group G1, which includes a first lens and a second lens; a second part, a zoom group G2, which includes an aperture, a third lens with positive focal length, a fourth lens with negative focal length, and a fifth lens; a third part, a compensation group G3, which includes a sixth lens and a seventh lens; the lenses are not attached to each other; the compensation group G3 moves along the optical axis with the zoom group G2; wherein the curvature radius R1 of the object side surface of the first lens and the effective focal length f1 of the first lens satisfy: 4.0<|R1 / f1|<6.0; the maximum field of view FOV of the zoom lens group at different zoom magnifications w Satisfy: 20°<|FOV w |<36°. The zoom lens group provided by the present invention is composed of three lens groups, and the three lens groups include seven lenses. The continuous zoom function is realized by moving the lens groups, and the imaging quality is good during the zooming process.

Description

Technical Field

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

[0002] With the rapid development of smart phones, the demand for mobile phone lenses with good imaging performance is increasing day by day. Mobile phone lenses that can only achieve a few specific focal length changes can no longer meet people's needs. In order to allow users to have a better photo-taking experience, mobile phone lenses need to have the characteristics of continuous focal length changes. Therefore, a mobile phone lens with a continuous zoom function is needed. In particular, a seven-piece zoom lens using an aspherical surface is needed, which realizes a continuous zoom function through the movement of the lens group, and has good image quality during the zooming process. Summary of the invention

[0003] The present invention aims to provide a zoom lens group consisting of three lens groups, wherein the three lens groups include seven lenses, and a continuous zoom function is achieved through the movement of the lens groups, and the imaging quality is good during the zooming process.

[0004] One aspect of the present invention provides a zoom lens group, which includes three parts along the optical axis from the object side to the image side: a first part, a front fixed group G1, which includes a first lens and a second lens; a second part, a zoom group G2, which includes an aperture, a third lens with positive optical power, a fourth lens with negative optical power, and a fifth lens; a third part, a compensation group G3, which includes a sixth lens and a seventh lens.

[0005] Among them, the lenses are not attached to each other; the compensation group G3 moves along the optical axis with the zoom group G2; the maximum field of view FOV of the zoom lens group at different zoom magnifications w Satisfy: 20°<|FOV w |<36°.

[0006] According to one embodiment of the present invention, the radius of curvature R1 of the object side surface of the first lens and the effective focal length f1 of the first lens satisfy: 4.0<|R1 / f1|<6.0.

[0007] According to one embodiment of the present invention, the curvature radius R2 of the image side surface of the first lens and the curvature radius R3 of the object side surface of the second lens satisfy: 1.0 <R2 / R3<1.5。

[0008] According to one embodiment of the present invention, the effective focal length f2 of the second lens and the curvature radius R4 of the image side surface of the second lens satisfy: 4.0 <f2 / R4<6.0。

[0009] According to one embodiment of the present invention, the total focal length f of the zoom lens group at different zoom factors isw Entrance pupil diameter EPD at different zoom factors w Satisfaction: 2.5 <f w / EPD w <4.0.

[0010] According to one embodiment of the present invention, the effective focal length f3 of the third lens and the curvature radius R5 of the object side surface of the third lens satisfy: 1.0 <f3 / R5<2.1。

[0011] According to one embodiment of the present invention, a radius of curvature R7 of the object side surface of the fourth lens and an effective focal length f4 of the fourth lens satisfy: 1.0<|R7 / f4|<4.0.

[0012] According to one embodiment of the present invention, the curvature radius R9 of the object side surface of the fifth lens and the curvature radius R8 of the image side surface of the fourth lens satisfy: 1.0 <R9 / R8<1.5。

[0013] According to one embodiment of the present invention, the curvature radius R10 of the image side surface of the fifth lens and the effective focal length f5 of the fifth lens satisfy: -3.5 <R10 / f5<-1.5。

[0014] According to one embodiment of the present invention, the maximum effective radius DT72 of the image side surface of the seventh lens and the maximum effective radius DT61 of the object side surface of the sixth lens satisfy: 1.0 <DT72 / DT61<1.5。

[0015] According to one embodiment of the present invention, the center thickness CT3 of the third lens on the optical axis and the center thickness CT1 of the first lens on the optical axis satisfy: 2.5 <CT3 / CT1<4.0。

[0016] According to one embodiment of the present invention, the center thickness CT5 of the fifth lens on the optical axis and the center thickness CT4 of the fourth lens on the optical axis satisfy: 1.5 <CT5 / CT4<4.0。

[0017] According to one embodiment of the present invention, the center thickness CT7 of the seventh lens on the optical axis and the center thickness CT2 of the second lens on the optical axis satisfy the following condition: 1.0 <CT7 / CT2<2.5。

[0018] According to one embodiment of the present invention, the air interval D1 between the second lens and the aperture on the optical axis at different zoom factors and the air interval D2 between the fifth lens and the sixth lens on the optical axis at different zoom factors satisfy the condition: 0≤D1 / D2<2.0.

[0019] According to one embodiment of the present invention, the total focal length f of the zoom lens group at different zoom factors is w, the air spacing D3 between the seventh lens and the filter on the optical axis at different zoom factors, and the half maximum field of view HFOV of the zoom lens group at different zoom factors w The conditional expression satisfied is: 0.5 <f w / D3×Tan(HFOV w )≤4.0.

[0020] Another aspect of the present invention provides a zoom lens group, which includes three parts along the optical axis from the object side to the image side: a first part, a front fixed group G1, which includes a first lens and a second lens; a second part, a zoom group G2, which includes an aperture, a third lens with positive optical power, a fourth lens with negative optical power, and a fifth lens; and a third part, a compensation group G3, which includes a sixth lens and a seventh lens.

[0021] Among them, the lenses are not attached to each other; the compensation group G3 moves along the optical axis with the zoom group G2; the curvature radius R1 of the object side of the first lens and the effective focal length f1 of the first lens satisfy: 4.0<|R1 / f1|<6.0.

[0022] Beneficial effects of the present invention:

[0023] The zoom lens group provided by the present invention includes multiple lens groups, such as the first lens group to the third lens group. The zoom lens group of the present invention is composed of three lens groups, and the three lens groups include seven lenses. The continuous zoom function is achieved by moving the lens groups, and the image quality is good during the zooming process. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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.

[0025] Figure 1 Schematic diagram of the 3x zoom position structure of the zoom lens assembly embodiment 1 of the present invention;

[0026] Figure 2 Schematic diagram of the 4x zoom position structure of the zoom lens assembly embodiment 1 of the present invention;

[0027] Figure 3 Schematic diagram of the 5x zoom position structure of the zoom lens assembly embodiment 1 of the present invention;

[0028] Figures 4a to 4dThey are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve of the zoom lens group at a 3x zoom position according to Example 1 of the present invention;

[0029] Figure 5a to Figure 5d They are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve at a 4x zoom position of the zoom lens group of Example 1 of the present invention;

[0030] Figures 6a to 6d They are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve at a 5x zoom position of the zoom lens group of Example 1 of the present invention;

[0031] Figure 7 Schematic diagram of the 3x zoom position structure of the zoom lens assembly embodiment 2 of the present invention;

[0032] Figure 8 Schematic diagram of the 4x zoom position structure of the zoom lens assembly embodiment 2 of the present invention;

[0033] Fig. 9 Schematic diagram of the 5x zoom position structure of the zoom lens assembly embodiment 2 of the present invention;

[0034] Figures 10a to 10d They are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve at a 3x zoom position of the zoom lens group of Example 2 of the present invention;

[0035] Figures 11a to 11d They are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve at a 4x zoom position of the zoom lens group of Example 2 of the present invention;

[0036] Figures 12a to 12d They are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve of the zoom lens set at a 5x zoom position according to Embodiment 2 of the present invention;

[0037] Fig.13 Schematic diagram of the 3x zoom position structure of the zoom lens assembly embodiment 3 of the present invention;

[0038] Fig.14 Schematic diagram of the 4x zoom position structure of the zoom lens assembly embodiment 3 of the present invention;

[0039] Fig.15 Schematic diagram of the 5x zoom position structure of the zoom lens assembly embodiment 3 of the present invention;

[0040] Figures 16a to 16d They are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve at a 3x zoom position of the zoom lens group of Example 3 of the present invention;

[0041] Figures 17a to 17dThey are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve at a 4x zoom position of the zoom lens group of Example 3 of the present invention;

[0042] Figures 18a to 18d They are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve of the zoom lens set at a 5x zoom position according to Embodiment 3 of the present invention;

[0043] Fig.19 Schematic diagram of the 3x zoom position structure of the zoom lens assembly embodiment 4 of the present invention;

[0044] Fig. 20 4 is a schematic diagram of the structure of the zoom lens assembly of Embodiment 4 of the present invention;

[0045] Fig.21 Schematic diagram of the 5x zoom position structure of the zoom lens assembly embodiment 4 of the present invention;

[0046] Figures 22a to 22d They are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve at a 3x zoom position of the zoom lens group of Example 4 of the present invention;

[0047] Figures 23a to 23d They are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve at a 4x zoom position of the zoom lens group of Example 4 of the present invention;

[0048] Figures 24a to 24d They are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve of the zoom lens group at a 5x zoom position according to Embodiment 4 of the present invention;

[0049] Fig.25 Schematic diagram of the 3x zoom position structure of the zoom lens assembly embodiment 5 of the present invention;

[0050] Fig.26 Schematic diagram of the 4x zoom position structure of the zoom lens assembly embodiment 5 of the present invention;

[0051] Fig. 27 Schematic diagram of the 5x zoom position structure of the zoom lens assembly embodiment 5 of the present invention;

[0052] Figures 28a to 28d They are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve of the zoom lens group at a 3x zoom position according to Embodiment 5 of the present invention;

[0053] Figures 29a to 29d They are respectively an axial chromatic aberration curve, an astigmatism curve, a distortion curve and a magnification chromatic aberration curve of the zoom lens group at a 4x zoom position according to Embodiment 5 of the present invention;

[0054] Figures 30a to 30dThey are respectively the on-axis chromatic aberration curve, the astigmatism curve, the distortion curve and the magnification chromatic aberration curve of the zoom lens group at the 5x zoom position according to Example 5 of the present invention. DETAILED DESCRIPTION

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] Exemplary Embodiments

[0063] The zoom lens group of the exemplary embodiment of the present invention includes three lens groups, which include a first front fixed group G1, a second variable magnification group G2 and a third compensation group G3 in order from the object side to the image side along the optical axis.

[0064] In this exemplary embodiment, the first partial front fixed group G1 includes a first lens and a second lens; the second partial zoom group G2 includes an aperture, a third lens, a fourth lens, and a fifth lens; and the third partial compensation group G3 includes a sixth lens and a seventh lens.

[0065] In this exemplary embodiment, the first lens may have positive optical power or negative optical power; the second lens may have positive optical power or negative optical power; the third lens has positive optical power; the fourth lens has negative optical power; the fifth lens may have positive optical power or negative optical power; the sixth lens may have positive optical power or negative optical power; and the seventh lens may have positive optical power or negative optical power.

[0066] In this exemplary embodiment, the curvature radius R1 of the object side of the first lens and the effective focal length f1 of the first lens satisfy the conditional formula: 4.0<|R1 / f1|<6.0. By constraining the curvature radius of the object side of the first lens and the effective focal length of the first lens, the deflection angle of the light in the first lens can be controlled, which is beneficial to reducing the sensitivity of the system. More specifically, at 3x zoom, R1 and f1 satisfy: 4.4<|R1 / f1|<6.0, for example, 4.49≤|R1 / f1|≤5.99; at 4x zoom, R1 and f1 satisfy: 4.4<|R1 / f1|<6.0, for example, 4.49≤|R1 / f1|≤5.99; at 5x zoom, R1 and f1 satisfy: 4.4<|R1 / f1|<6.0, for example, 4.49≤|R1 / f1|≤5.99.

[0067] In this exemplary embodiment, the maximum field of view FOV of the zoom lens group at different zoom factors is wThe satisfied conditional expression is: 20° < |FOV w | < 36°. The field of view angle range of the zoom lens is reasonably controlled, enabling the zoom lens to have a better ability to balance aberrations, and being able to reasonably control the main ray deflection angle to improve the matching degree with the chip. More specifically, at 3x zoom, FOV w satisfies: 33° < |FOV w | < 35.5°, for example, 33.9° ≤ |FOV w | ≤ 35.4°; at 4x zoom, FOV w satisfies: 25° < |FOV w | < 27°, for example, 25.6° ≤ |FOV w | ≤ 26.5°; at 5x zoom, FOV w satisfies: 20.3° < |FOV w | < 22°, for example, 20.4° ≤ |FOV w | ≤ 21.1°.

[0068] In this exemplary embodiment, the conditional expression satisfied by the radius of curvature R2 of the image side of the first lens and the radius of curvature R3 of the object side of the second lens is: 1.0 < R2 / R3 < 1.5. By controlling the radius of curvature of the image side of the first lens and the object side of the second lens, the optical imaging lens is enabled to have a strong ability to balance astigmatism and reasonably control the main ray deflection angle. More specifically, at 3x zoom, it satisfies: 1.0 < R2 / R3 < 1.3, for example, 1.01 ≤ R2 / R3 ≤ 1.23; at 4x zoom, it satisfies: 1.0 < R2 / R3 < 1.3, for example, 1.01 ≤ R2 / R3 ≤ 1.23; at 5x zoom, it satisfies: 1.0 < R2 / R3 < 1.3, for example, 1.01 ≤ R2 / R3 ≤ 1.23.

[0069] In this exemplary embodiment, the conditional expression satisfied by the effective focal length f2 of the second lens and the radius of curvature R4 of the image side of the second lens is: 4.0 < f2 / R4 < 6.0. By restricting the effective focal length of the second lens and the radius of curvature of the image side of the second lens, it is beneficial to correct aberrations and enable the lens to have good imaging quality. More specifically, at 3x zoom, it satisfies: 4.4 < f2 / R4 < 5.8, for example, 4.50 ≤ f2 / R4 ≤ 5.78; at 4x zoom, it satisfies: 4.4 < f2 / R4 < 5.8, for example, 4.50 ≤ f2 / R4 ≤ 5.78; at 5x zoom, it satisfies: 4.4 < f2 / R4 < 5.8, for example, 4.50 ≤ f2 / R4 ≤ 5.78.

[0070] In this exemplary embodiment, the total focal length f of the zoom lens group at different zoom ratios w and the entrance pupil diameter EPD at different zoom ratios wThe satisfied conditional expression is: 2.5 < f w / EPD w < 4.0. The zoom lens has the characteristics of different aperture sizes. By restricting the ratio of the total focal length to the entrance pupil diameter at different zoom ratios, the light flux of the system can be increased, the imaging effect in a dark environment can be enhanced, and at the same time, the aberration of the edge field of view can be reduced. More specifically, at a 3x zoom, it satisfies: 2.8 < f w / EPD w < 2.9. For example, 2.82 ≤ f w / EPD w ≤ 2.85; at a 4x zoom, it satisfies: 3.3 < f w / EPD w < 3.45. For example, 3.39 ≤ f w / EPD w ≤ 3.41; at a 5x zoom, it satisfies: 3.8 < f w / EPD w < 3.9. For example, 3.87 ≤ f w / EPD w ≤ 3.89.

[0071] In this exemplary embodiment, the conditional expression satisfied by the effective focal length f3 of the third lens and the curvature radius R5 of the object side surface of the third lens is: 1.0 < f3 / R5 < 2.1. By restricting the effective focal length of the third lens and the curvature radius of the object side surface of the third lens, the optical imaging lens has a better ability to balance chromatic aberration and distortion. More specifically, at a 3x zoom, it satisfies: 1.4 < f3 / R5 < 2.05. For example, 1.49 ≤ f3 / R5 ≤ 2.00; at a 4x zoom, it satisfies: 1.4 < f3 / R5 < 2.05. For example, 1.49 ≤ f3 / R5 ≤ 2.00; at a 5x zoom, it satisfies: 1.4 < f3 / R5 < 2.05. For example, 1.49 ≤ f3 / R5 ≤ 2.00.

[0072] In this exemplary embodiment, the conditional expression satisfied by the curvature radius R7 of the object side surface of the fourth lens and the effective focal length f4 of the fourth lens is: 1.0 < |R7 / f4| < 4.0. By reasonably controlling the curvature radius of the object side surface of the fourth lens and the effective focal length of the fourth lens, the system has a smaller spherical aberration and the lens has good imaging quality. More specifically, at a 3x zoom, it satisfies: 1.4 < |R7 / f4| < 3.98. For example, 1.43 ≤ |R7 / f4| ≤ 3.97; at a 4x zoom, it satisfies: 1.4 < |R7 / f4| < 3.98. For example, 1.43 ≤ |R7 / f4| ≤ 3.97; at a 5x zoom, it satisfies: 1.4 < |R7 / f4| < 3.98. For example, 1.43 ≤ |R7 / f4| ≤ 3.97.

[0073] In the present exemplary embodiment, the conditional expression satisfied by the radius of curvature R9 of the object side surface of the fifth lens and the radius of curvature R8 of the image side surface of the fourth lens is: 1.0 < R9 / R8 < 1.5. By restricting the radius of curvature of the image side surface of the fourth lens and the radius of curvature of the object side surface of the fifth lens, the refraction angle of the light beam in the variable magnification group G2 can be effectively controlled, so that while the variable magnification group G2 changes the magnification of the lens, the sensitivity of the system can be effectively reduced. More specifically, at 3x zoom, it satisfies: 1.0 < R9 / R8 < 1.5, for example, 1.02 ≤ R9 / R8 ≤ 1.49; at 4x zoom, it satisfies: 1.0 < R9 / R8 < 1.5, for example, 1.02 ≤ R9 / R8 ≤ 1.49; at 5x zoom, it satisfies: 1.0 < R9 / R8 < 1.5, for example, 1.02 ≤ R9 / R8 ≤ 1.49.

[0074] In the present exemplary embodiment, the conditional expression satisfied by the radius of curvature R10 of the image side surface of the fifth lens and the effective focal length f5 of the fifth lens is: -3.5 < R10 / f5 < -1.5. By restricting the radius of curvature of the image side surface of the fifth lens and the effective focal length of the fifth lens, the deflection angle of the light in the fifth lens can be effectively controlled, achieving good processing characteristics of the system. More specifically, at 3x zoom, it satisfies: -3.48 < R10 / f5 < -1.55, for example, -3.47 ≤ R10 / f5 ≤ -1.56; at 4x zoom, it satisfies: -3.48 < R10 / f5 < -1.55, for example, -3.47 ≤ R10 / f5 ≤ -1.56; at 5x zoom, it satisfies: -3.48 < R10 / f5 < -1.55, for example, -3.47 ≤ R10 / f5 ≤ -1.56.

[0075] In the present exemplary embodiment, the conditional expression satisfied by the maximum effective radius DT72 of the image side surface of the seventh lens and the maximum effective radius DT61 of the object side surface of the sixth lens is: 1.0 < DT72 / DT61 < 1.5. By restricting the maximum effective radii of the image side surface of the seventh lens and the object side surface of the sixth lens, the refraction angle of the light beam in the compensation group G3 can be effectively controlled, enabling the lens to achieve good zoom characteristics. More specifically, at 3x zoom, it satisfies: 1.02 < DT72 / DT61 < 1.3, for example, 1.03 ≤ DT72 / DT61 ≤ 1.22; at 4x zoom, it satisfies: 1.02 < DT72 / DT61 < 1.3, for example, 1.03 ≤ DT72 / DT61 ≤ 1.22; at 5x zoom, it satisfies: 1.02 < DT72 / DT61 < 1.3, for example, 1.03 ≤ DT72 / DT61 ≤ 1.22.

[0076] In this exemplary embodiment, the conditional expression satisfied by the central thickness CT3 of the third lens on the optical axis and the central thickness CT1 of the first lens on the optical axis is: 2.5 < CT3 / CT1 < 4.0. By reasonably controlling the ratio of the central thicknesses of the first lens and the third lens on the optical axis, the degree of freedom of lens surface variation is higher, thereby improving the ability of the optical imaging lens to correct astigmatism and field curvature. More specifically, at 3x zoom, it satisfies: 2.8 < CT3 / CT1 < 3.9, for example, 2.90 ≤ CT3 / CT1 ≤ 3.85; at 4x zoom, it satisfies: 2.8 < CT3 / CT1 < 3.9, for example, 2.90 ≤ CT3 / CT1 ≤ 3.85; at 5x zoom, it satisfies: 2.8 < CT3 / CT1 < 3.9, for example, 2.90 ≤ CT3 / CT1 ≤ 3.85.

[0077] In this exemplary embodiment, the conditional expression satisfied by the central thickness CT5 of the fifth lens on the optical axis and the central thickness CT4 of the fourth lens on the optical axis is: 1.5 < CT5 / CT4 < 4.0. By reasonably controlling the ratio of the central thicknesses of the fourth lens and the fifth lens on the optical axis, the system size is effectively compressed, avoiding the excessive volume of the lens group of the optical imaging lens. More specifically, at 3x zoom, it satisfies: 1.55 < CT5 / CT4 < 3.7, for example, 1.60 ≤ CT5 / CT4 ≤ 3.67; at 4x zoom, it satisfies: 1.55 < CT5 / CT4 < 3.7, for example, 1.60 ≤ CT5 / CT4 ≤ 3.67; at 5x zoom, it satisfies: 1.55 < CT5 / CT4 < 3.7, for example, 1.60 ≤ CT5 / CT4 ≤ 3.67.

[0078] In this exemplary embodiment, the conditional expression satisfied by the central thickness CT7 of the seventh lens on the optical axis and the central thickness CT2 of the second lens on the optical axis is: 1.0 < CT7 / CT2 < 2.5. By controlling the central thicknesses of the second lens and the seventh lens on the optical axis, the system can have a smaller field curvature. More specifically, at 3x zoom, it satisfies: 1.3 < CT7 / CT2 < 2.2, for example, 1.34 ≤ CT7 / CT2 ≤ 2.13; at 4x zoom, it satisfies: 1.3 < CT7 / CT2 < 2.2, for example, 1.34 ≤ CT7 / CT2 ≤ 2.13; at 5x zoom, it satisfies: 1.3 < CT7 / CT2 < 2.2, for example, 1.34 ≤ CT7 / CT2 ≤ 2.13.

[0079] In the present exemplary embodiment, the conditional expression satisfied by the air gap D1 between the second lens and the diaphragm on the optical axis at different zoom ratios and the air gap D2 between the fifth lens and the sixth lens on the optical axis at different zoom ratios is: 0 ≤ D1 / D2 < 2.0. By constraining the ratio of the air gap between the second lens and the diaphragm on the optical axis to the air gap between the fifth lens and the sixth lens on the optical axis at different zoom ratios, the travel difference between the variable magnification group G2 and the compensation group G3 can be reasonably controlled, which is beneficial to the realization of the zoom process. More specifically, at 3x zoom, it satisfies: 1.7 < D1 / D2 < 1.9, for example, 1.72 ≤ D1 / D2 ≤ 1.8; at 4x zoom, it satisfies: 1.1 < D1 / D2 < 1.4, for example, 1.15 ≤ D1 / D2 ≤ 1.35; at 5x zoom, it satisfies: 0.2 < D1 / D2 < 0.5, for example, 0.27 ≤ D1 / D2 ≤ 0.4.

[0080] In the present exemplary embodiment, the total focal length f of the zoom lens group at different zoom ratios w 、the air gap D3 between the seventh lens and the filter on the optical axis at different zoom ratios, and the half of the maximum field of view HFOV of the zoom lens group at different zoom ratios w satisfy the conditional expression: 0.5 < f w / D3 × Tan(HFOV w ) ≤ 4.0. Reasonably controlling the total focal length of the zoom lens group at different zoom ratios, the air gap between the seventh lens and the filter on the optical axis, and the half of the maximum field of view at different zoom ratios is beneficial to realizing the characteristic of continuous focal length change, can effectively reduce the aberration of the lens, and enable the lens to maintain good imaging quality during the zoom process. More specifically, at 3x zoom, it satisfies: 3.8 < f w / D3 × Tan(HFOV w ) < 3.95, for example, 3.86 ≤ f w / D3 × Tan(HFOV w ) ≤ 3.92; at 4x zoom, it satisfies: 0.8 < f w / D3 × Tan(HFOV w ) < 1.2, for example, 1.0 ≤ f w / D3 × Tan(HFOV w ) ≤ 1.11; at 5x zoom, it satisfies: 0.6 < f w / D3 × Tan(HFOV w ) < 0.8, for example, 0.66 ≤ f w / D3 × Tan(HFOV w ) ≤ 0.71.

[0081] In this exemplary embodiment, the zoom lens group may further include a diaphragm. The diaphragm may be disposed at an appropriate position as required, for example, the diaphragm may be disposed between the object side and the first lens. Optionally, the zoom lens group may further include a filter for correcting color deviation and / or a protective glass for protecting a photosensitive element located on the imaging surface.

[0082] The zoom lens group according to the above embodiment of the present invention can use multiple lenses, such as the above seven lenses. By reasonably allocating the focal length, surface shape, center thickness of each lens, and axial spacing between lenses, the zoom lens group has a larger imaging surface, a wide imaging range, and high imaging quality, and ensures the ultra-thinness of the mobile phone.

[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 characteristics of the aspherical lens are: the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike the spherical lens with a constant curvature from the center of the lens to the periphery of the lens, the aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting the aspherical lens, the aberration that occurs 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.

[0084] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the zoom lens group can be changed to obtain the various results and advantages described in this specification. For example, although seven lenses are described as an example in the embodiments, the zoom lens group is not limited to including seven lenses, and the zoom lens group may also include other numbers of lenses if necessary.

[0085] Specific embodiments of the zoom lens assembly applicable to the above-mentioned embodiments will be further described below with reference to the accompanying drawings. Specific embodiment 1

[0087] Figure 1 Schematic diagram of the 3x zoom position structure of the zoom lens assembly embodiment 1 of the present invention, Figure 2 4 is a schematic diagram of the 4x zoom position structure of the zoom lens assembly embodiment 1 of the present invention, Figure 3 Schematic diagram of the 5x zoom position structure of the zoom lens assembly embodiment 1 of the present invention.

[0088] 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 front fixed group G1, a zoom group G2, a compensation group G3, a filter E8 and an imaging surface S17. The front fixed group G1 includes a first lens E1 and a second lens E2, the zoom group G2 includes a stop, a third lens E3, a fourth lens E4 and a fifth lens E5, and the compensation group G3 includes a sixth lens E6 and a seventh lens E7.

[0089] The first lens E1 has negative power, and its object side surface S1 is convex, 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 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 E8 has an object side surface S15 and an image side surface S16. The light from the object passes through each surface of the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0090] As shown in Table 1, it is a table of structural parameters of the zoom lens assembly of Example 1, wherein the units of the radius of curvature and thickness are both millimeters (mm).

[0091]

[0092]

[0093] Table 1

[0094] As shown in Table 2, in Example 1, the total focal length of the zoom lens group at different zoom factors is f w , numerical aperture is Fno w , Maximum field of view FOV of zoom lens group at different zoom factors w , the air interval between the second lens and the aperture on the optical axis at different zoom factors is D1, the air interval between the fifth lens and the sixth lens on the optical axis at different zoom factors is D2, and the air interval between the seventh lens and the filter on the optical axis at different zoom factors is D3.

[0095]

[0096] Table 2 As shown in Table 3, the specific values ​​of each conditional expression in Example 1 all satisfy the relationship of the conditional expression.

[0097] Conditional / zoom factor 3X 4X 5X |R1 / f1| 5.99 5.99 5.99 <![CDATA[|FOV w |(°)]]> 34.4 26.0 20.8 R2 / R3 1.10 1.10 1.10 f2 / R4 5.41 5.41 5.41 <![CDATA[f w / EPD w ]]> 2.85 3.41 3.88 f3 / R5 2.00 2.00 2.00 |R7 / f4| 1.43 1.43 1.43 R9 / R8 1.24 1.24 1.24 R10 / f5 -3.28 -3.28 -3.28 DT72 / DT61 1.19 1.19 1.19 CT3 / CT1 3.53 3.53 3.53 CT5 / CT4 3.67 3.67 3.67 CT7 / CT2 2.08 2.08 2.08 D1 / D2 1.77 1.17 0.35 <![CDATA[f w / D3×Tan(HFOV w )]]> 3.92 1.03 0.66

[0098] Table 3

[0099] The zoom lens group in Example 1 satisfies:

[0100] At 3x zoom, |R1 / f1|=5.99, at 4x zoom, |R1 / f1|=5.99, at 5x zoom, |R1 / f1|=5.99, where R1 is the radius of curvature of the object side of the first lens, and f1 is the effective focal length of the first lens;

[0101] At 3x zoom, |FOV w |=34.1°, at 4x zoom, |FOV w |=26.0°, at 5x zoom, |FOV w |=20.8°, where FOV w is the maximum field of view angle of the zoom lens group at different zoom factors;

[0102] At 3x zoom, R2 / R3=1.10, at 4x zoom, R2 / R3=1.10, at 5x zoom, R2 / R3=1.10, where R2 is the radius of curvature of the image side of the first lens, and R3 is the radius of curvature of the object side of the second lens;

[0103] At 3x zoom, f2 / R4=5.41, at 4x zoom, f2 / R4=5.41, at 5x zoom, f2 / R4=5.41, where f2 is the effective focal length of the second lens, and R4 is the radius of curvature of the image side of the second lens;

[0104] At 3x zoom, f w / EPD w =2.85, at 4x zoom, f w / EPD w =3.41, at 5x zoom, f w / EPD w =3.88, where f w is the total focal length of the zoom lens group at different zoom factors, EPD w is the entrance pupil diameter at different zoom factors;

[0105] At 3x zoom, f3 / R5=2.00, at 4x zoom, f3 / R5=2.00, at 5x zoom, f3 / R5=2.00, where f3 is the effective focal length of the third lens, and R5 is the radius of curvature of the object side of the third lens;

[0106] At 3x zoom, |R7 / f4|=1.43, at 4x zoom, |R7 / f4|=1.43, at 5x zoom, |R7 / f4|=1.43, where R7 is the radius of curvature of the object side of the fourth lens, and f4 is the effective focal length of the fourth lens;

[0107] At 3x zoom, R9 / R8=1.24, at 4x zoom, R9 / R8=1.24, at 5x zoom, R9 / R8=1.24, where R9 is the radius of curvature of the object side of the fifth lens, and R8 is the radius of curvature of the image side of the fourth lens;

[0108] At 3x zoom, R10 / f5=-3.28, at 4x zoom, R10 / f5=-3.28, at 5x zoom, R10 / f5=-3.28, where R10 is the radius of curvature of the image side of the fifth lens, and f5 is the effective focal length of the fifth lens;

[0109] At 3x zoom, DT72 / DT61=1.19, at 4x zoom, DT72 / DT61=1.19, at 5x zoom, DT72 / DT61=1.19, where DT72 is the maximum effective radius of the image side of the seventh lens, and DT61 is the maximum effective radius of the object side of the sixth lens;

[0110] At 3x zoom, CT3 / CT1=3.53, at 4x zoom, CT3 / CT1=3.53, at 5x zoom, CT3 / CT1=3.53, where CT3 is the center thickness of the third lens on the optical axis, and CT1 is the center thickness of the first lens on the optical axis;

[0111] At 3x zoom, CT5 / CT4=3.67, at 4x zoom, CT5 / CT4=3.67, at 5x zoom, CT5 / CT4=3.67, where CT5 is the center thickness of the fifth lens on the optical axis, and CT4 is the center thickness of the fourth lens on the optical axis;

[0112] At 3x zoom, CT7 / CT2=2.08, at 4x zoom, CT7 / CT2=2.08, at 5x zoom, CT7 / CT2=2.08, where CT7 is the center thickness of the seventh lens on the optical axis, and CT2 is the center thickness of the second lens on the optical axis;

[0113] At 3x zoom, D1 / D2=1.77, at 4x zoom, D1 / D2=1.17, at 5x zoom, D1 / D2=0.35, where D1 is the air spacing between the second lens and the aperture on the optical axis at different zoom factors, and D2 is the air spacing between the fifth lens and the sixth lens on the optical axis at different zoom factors;

[0114] At 3x zoom, f w / D3×Tan(HFOV w )=3.92, at 4x zoom, f w / D3×Tan(HFOV w )=1.03, at 5x zoom, f w / D3×Tan(HFOV w )=0.66, where f w is the total focal length of the zoom lens group at different zoom factors, D3 is the air spacing between the seventh lens and the filter on the optical axis at different zoom factors, HFOV w It is half of the maximum field of view angle of the zoom lens group at different zoom factors.

[0115] In Example 1, the object side surface and the image side surface of any lens among the first lens E1 to the seventh lens E7 are both aspherical surfaces, and the surface shape x of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0116]

[0117] 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.

[0118] 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 4 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 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0119]

[0120]

[0121] Table 4

[0122] Figure 4a The axial chromatic aberration curve of the zoom lens group of Example 1 at the 3x zoom position is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 4bThe astigmatism curve of the zoom lens group of Example 1 at the 3x zoom position is shown, which indicates the meridional image plane curvature and the sagittal image plane curvature. Figure 4c The distortion curve of the zoom lens group of Example 1 at the 3x zoom position is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. Figure 4d The chromatic aberration curve of the zoom lens group of Example 1 at the 3x zoom position is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens.

[0123] Figure 5a The axial chromatic aberration curve of the zoom lens group of Example 1 at the 4x zoom position is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 5b The astigmatism curve of the zoom lens group of Example 1 at the 4x zoom position is shown, which indicates the meridional image plane curvature and the sagittal image plane curvature. Figure 5c The distortion curve of the zoom lens group of Example 1 at a 4x zoom position is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. Figure 5d The chromatic aberration curve of the zoom lens group of Example 1 at the 4x zoom position is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens.

[0124] Figure 6a The axial chromatic aberration curve of the zoom lens group of Example 1 at the 5x zoom position is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 6b The astigmatism curve of the zoom lens group of Example 1 at the 5x zoom position is shown, which indicates the meridional image curvature and the sagittal image curvature. Figure 6c The distortion curve of the zoom lens group of Example 1 at the 5x zoom position is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. Figure 6d The chromatic aberration curve of the zoom lens group of Example 1 at the 5x zoom position is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens.

[0125] As shown in FIG. 4 to FIG. 6 , it can be seen that the zoom lens assembly provided in Example 1 can achieve good imaging quality. Specific embodiment 2

[0127] Figure 7 3x zoom position structure diagram of zoom lens assembly embodiment 2 of the present invention, Figure 8 4x zoom position structure schematic diagram of the zoom lens assembly embodiment 2 of the present invention, Fig. 9 Schematic diagram of the 5x zoom position structure of the zoom lens assembly embodiment 2 of the present invention.

[0128] like Figures 7 to 9As shown, the zoom lens group includes, from the object side to the image side along the optical axis, a front fixed group G1, a zoom group G2, a compensation group G3, a filter E8 and an imaging surface S17. The front fixed group G1 includes a first lens E1 and a second lens E2, the zoom group G2 includes a stop, a third lens E3, a fourth lens E4 and a fifth lens E5, and the compensation group G3 includes a sixth lens E6 and a seventh lens E7.

[0129] 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 convex. 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 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 E8 has an object side surface S15 and an image side surface S16. The light from the object passes through each surface of the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0130] As shown in Table 5, it is a table of structural parameters of the zoom lens assembly of Example 2, wherein the units of the radius of curvature and thickness are both millimeters (mm).

[0131] Face number Surface type Radius of curvature Thickness / distance focal length Refractive Index Dispersion coefficient Cone coefficient OBJ Spherical endless endless S1 Aspheric -58.5939 0.6000 -12.91 1.55 55.8 4.5590 S2 Aspheric 8.0406 0.2064 0.2475 S3 Aspheric 6.5550 0.8000 37.73 1.68 19.2 -5.4033 S4 Aspheric 8.3810 D1 -6.5786 STO Spherical endless -0.7975 S5 Aspheric 5.3899 2.0119 8.85 1.55 55.8 -0.3640 S6 Aspheric -40.5373 0.8840 99.0000 S7 Aspheric 19.0597 0.7078 -9.67 1.68 19.2 -1.4427 S8 Aspheric 4.8029 0.3000 -0.0806 S9 Aspheric 6.1079 1.9563 9.15 1.57 37.3 0.0334 S10 Aspheric -31.7146 D2 29.1168 S11 Aspheric -8.6422 2.0516 32.42 1.68 19.2 -2.6374 S12 Aspheric -6.7968 0.2985 0.7590 S13 Aspheric -24.2795 1.6002 -11.79 1.54 55.8 17.3556 S14 Aspheric 8.7547 D3 1.7882 S15 Spherical endless 0.2100 1.52 64.2 S16 Spherical endless 2.7408 S17 Spherical endless

[0132] Table 5

[0133] As shown in Table 6, in Example 2, the total focal length of the zoom lens group at different zoom factors is f w , numerical aperture is Fno w , Maximum field of view FOV of zoom lens group at different zoom factors w , the air interval between the second lens and the aperture on the optical axis at different zoom factors is D1, the air interval between the fifth lens and the sixth lens on the optical axis at different zoom factors is D2, and the air interval between the seventh lens and the filter on the optical axis at different zoom factors is D3.

[0134]

[0135] Table 6 As shown in Table 7, the specific values ​​of each conditional expression in Example 2 all satisfy the relationship of the conditional expression.

[0136] Conditional / zoom factor 3X 4X 5X |R1 / f1| 4.54 4.54 4.54 <![CDATA[|FOV w |(°)]]> 33.9 25.6 20.4 R2 / R3 1.23 1.23 1.23 f2 / R4 4.50 4.50 4.50 <![CDATA[f w / EPD w ]]> 2.83 3.39 3.87 f3 / R5 1.64 1.64 1.64 |R7 / f4| 1.97 1.97 1.97 R9 / R8 1.27 1.27 1.27 R10 / f5 -3.47 -3.47 -3.47 DT72 / DT61 1.17 1.17 1.17 CT3 / CT1 3.35 3.35 3.35 CT5 / CT4 2.76 2.76 2.76 CT7 / CT2 2.00 2.00 2.00 D1 / D2 1.76 1.15 0.37 <![CDATA[f w / D3×Tan(HFOV w )]]> 3.91 1.03 0.68

[0137] Table 7

[0138] 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 8 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, A2 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0139]

[0140]

[0141] Table 8

[0142] Fig.10a The axial chromatic aberration curve of the zoom lens group of Example 2 at the 3x zoom position is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Fig.10b The astigmatism curve of the zoom lens group of Example 2 at the 3x zoom position is shown, which indicates the meridional image plane curvature and the sagittal image plane curvature. Fig.10c The distortion curve of the zoom lens group of Example 2 at the 3x zoom position is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. Fig.10d The chromatic aberration curve of the zoom lens group of Example 2 at the 3x zoom position is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens.

[0143] Fig.11a The axial chromatic aberration curve of the zoom lens group of Example 2 at the 4x zoom position is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Fig.11b The astigmatism curve of the zoom lens group of Example 2 at the 4x zoom position is shown, which indicates the meridional image plane curvature and the sagittal image plane curvature. Fig.11c The distortion curve of the zoom lens group of Example 2 at the 4x zoom position is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. Fig.11d The chromatic aberration curve of the zoom lens group of Example 2 at the 4x zoom position is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens.

[0144] Fig.12a The axial chromatic aberration curve of the zoom lens group of Example 2 at the 5x zoom position is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 12bThe astigmatism curve of the zoom lens group of Example 2 at the 5x zoom position is shown, which indicates the meridional image plane curvature and the sagittal image plane curvature. Fig.12c The distortion curve of the zoom lens group of Example 2 at the 5x zoom position is shown, which indicates the distortion magnitude values ​​corresponding to different image heights. Fig.12d The chromatic aberration curve of the zoom lens group of Example 2 at the 5x zoom position is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens.

[0145] As shown in FIG. 10 to FIG. 12 , it can be seen that the zoom lens group provided in Example 2 can achieve good imaging quality. Specific embodiment 3

[0147] Fig.13 3x zoom position structure diagram of zoom lens assembly embodiment 3 of the present invention, Fig.14 4x zoom position structure diagram of zoom lens assembly embodiment 3 of the present invention, Fig.15 Schematic diagram of the 5x zoom position structure of the zoom lens assembly embodiment 3 of the present invention.

[0148] 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 front fixed group G1, a zoom group G2, a compensation group G3, a filter E8 and an imaging surface S17. The front fixed group G1 includes a first lens E1 and a second lens E2, the zoom group G2 includes a stop, a third lens E3, a fourth lens E4 and a fifth lens E5, and the compensation group G3 includes a sixth lens E6 and a seventh lens E7.

[0149] The first lens E1 has negative power, and its object side surface S1 is convex, 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 convex. 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 convex. The sixth lens E6 has negative 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 convex, and its image side surface S14 is concave. The filter E8 has an object side surface S15 and an image side surface S16. The light from the object passes through each surface of the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0150] As shown in Table 9, it is a structural parameter table of the zoom lens group of Example 3, wherein the units of the curvature radius and thickness are both millimeters (mm).

[0151] Face number Surface type Radius of curvature Thickness / distance focal length Refractive Index Dispersion coefficient Cone coefficient OBJ Spherical endless endless S1 Aspheric 76.2948 0.6165 -13.32 1.55 55.8 -99.0000 S2 Aspheric 6.6183 0.2920 -0.3448 S3 Aspheric 6.5444 0.8098 39.88 1.68 19.2 -5.2376 S4 Aspheric 8.2045 D1 -7.1512 STO Spherical endless -0.7975 S5 Aspheric 5.1644 1.8078 8.95 1.55 55.8 -0.3426 S6 Aspheric -79.9818 0.3511 99.0000 S7 Aspheric 17.9935 0.7627 -10.86 1.68 19.2 -1.3123 S8 Aspheric 5.1323 0.5058 -0.1476 S9 Aspheric 7.4242 2.0098 9.76 1.57 37.3 -0.2744 S10 Aspheric -20.0323 D2 11.0665 S11 Aspheric -7.4834 2.1300 -103.40 1.68 19.2 -3.0404 S12 Aspheric -9.3416 0.1680 5.9607 S13 Aspheric 21.5966 1.7220 -22.86 1.54 55.8 -73.6943 S14 Aspheric 7.6077 D3 1.0251 S15 Spherical endless 0.2100 1.52 64.2 S16 Spherical endless 2.6733 S17 Spherical endless

[0152] Table 9

[0153] As shown in Table 10, in Example 3, the total focal length of the zoom lens group at different zoom factors is f w , numerical aperture is Fno w , Maximum field of view FOV of zoom lens group at different zoom factors w , the air interval between the second lens and the aperture on the optical axis at different zoom factors is D1, the air interval between the fifth lens and the sixth lens on the optical axis at different zoom factors is D2, and the air interval between the seventh lens and the filter on the optical axis at different zoom factors is D3.

[0154]

[0155]

[0156] Table 10 As shown in Table 11, the specific values ​​of each conditional expression in Example 3 all satisfy the relationship of the conditional expression.

[0157] Conditional / zoom factor 3X 4X 5X |R1 / f1| 5.73 5.73 5.73 <![CDATA[|FOV w |(°)]]> 35.4 26.5 21.1 R2 / R3 1.01 1.01 1.01 f2 / R4 4.86 4.86 4.86 <![CDATA[f w / EPD w ]]> 2.82 3.40 3.89 f3 / R5 1.73 1.73 1.73 |R7 / f4| 1.66 1.66 1.66 R9 / R8 1.45 1.45 1.45 R10 / f5 -2.05 -2.05 -2.05 DT72 / DT61 1.21 1.21 1.21 CT3 / CT1 2.93 2.93 2.93 CT5 / CT4 2.64 2.64 2.64 CT7 / CT2 2.13 2.13 2.13 D1 / D2 1.8 1.2 0.3 <![CDATA[f w / D3×Tan(HFOV w )]]> 3.9 1.0 0.7

[0158] Table 11

[0159] 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 12 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 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0160]

[0161]

[0162] Table 12

[0163] Fig.16a The axial chromatic aberration curve of the zoom lens group of Example 3 at the 3x zoom position is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Fig.16b The astigmatism curve of the zoom lens group of Example 3 at the 3x zoom position is shown, which indicates the meridional image plane curvature and the sagittal image plane curvature. Fig.16cThe distortion curve of the zoom lens group of Example 3 at the 3x zoom position is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.16d The chromatic aberration curve of the zoom lens group of Example 3 at the 3x zoom position is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens.

[0164] Fig.17a The axial chromatic aberration curve of the zoom lens group of Example 3 at the 4x zoom position is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Fig.17b The astigmatism curve of the zoom lens group of Example 3 at the 4x zoom position is shown, which indicates the meridional image plane curvature and the sagittal image plane curvature. Fig.17c The distortion curve of the zoom lens group of Example 3 at the 4x zoom position is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.17d The chromatic aberration curve of the zoom lens group of Example 3 at the 4x zoom position is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens.

[0165] Fig.18a The axial chromatic aberration curve of the zoom lens group of Example 3 at the 5x zoom position is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Fig.18b The astigmatism curve of the zoom lens group of Example 3 at the 5x zoom position is shown, which indicates the meridional image plane curvature and the sagittal image plane curvature. Fig.18c The distortion curve of the zoom lens group of Example 3 at the 5x zoom position is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.18d The chromatic aberration curve of the zoom lens group of Example 3 at the 5x zoom position is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens.

[0166] As shown in FIG. 16 to FIG. 18 , it can be seen that the zoom lens group provided in Example 3 can achieve good imaging quality. Specific embodiment 4

[0168] Fig.19 3x zoom position structure diagram of zoom lens assembly embodiment 4 of the present invention, Fig. 20 4 is a schematic diagram of the 4x zoom position structure of the zoom lens assembly embodiment 4 of the present invention, Fig.21 Schematic diagram of the 5x zoom position structure of the zoom lens assembly embodiment 4 of the present invention.

[0169] like Figures 19 to 21As shown, the zoom lens group includes, from the object side to the image side along the optical axis, a front fixed group G1, a zoom group G2, a compensation group G3, a filter E8 and an imaging surface S17. The front fixed group G1 includes a first lens E1 and a second lens E2, the zoom group G2 includes a stop, a third lens E3, a fourth lens E4 and a fifth lens E5, and the third lens group G3 includes a sixth lens E6 and a seventh lens E7.

[0170] The first lens E1 has negative power, and its object side surface S1 is convex, 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 convex. 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 convex. The sixth lens E6 has positive power, and its object side surface S11 is convex, 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 E8 has an object side surface S15 and an image side surface S16. The light from the object passes through each surface of the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0171] As shown in Table 13, it is a structural parameter table of the zoom lens group of Example 4, wherein the units of the curvature radius and thickness are both millimeters (mm).

[0172] Face number Surface type Radius of curvature Thickness / distance focal length Refractive Index Dispersion coefficient Cone coefficient OBJ Spherical endless endless S1 Aspheric 70.2404 0.6934 -13.23 1.55 55.8 -98.9236 S2 Aspheric 6.5277 0.3483 0.1990 S3 Aspheric 5.9034 0.8000 40.98 1.68 19.2 -5.5499 S4 Aspheric 7.0871 D1 -7.6933 STO Spherical endless -0.7975 S5 Aspheric 5.3517 2.0127 8.84 1.55 55.8 -0.2605 S6 Aspheric -42.7289 0.8978 -99.0000 S7 Aspheric 33.4221 0.6290 -9.29 1.68 19.2 -2.8944 S8 Aspheric 5.2580 0.3805 -0.1736 S9 Aspheric 7.8434 2.0367 9.19 1.57 37.3 0.1272 S10 Aspheric -14.3151 D2 9.7881 S11 Aspheric 78.3169 1.9730 36.21 1.68 19.2 12.2294 S12 Aspheric -35.3606 0.5274 18.6456 S13 Aspheric -29.5072 1.0753 -11.25 1.54 55.8 -39.8721 S14 Aspheric 7.6927 D3 3.0602 S15 Spherical endless 0.2100 1.52 64.2 S16 Spherical endless 2.9536 S17 Spherical endless

[0173] Table 13

[0174] As shown in Table 14, in Example 4, the total focal length of the zoom lens group at different zoom factors is f w , numerical aperture is Fno w , Maximum field of view FOV of zoom lens group at different zoom factors w , the air interval between the second lens and the aperture on the optical axis at different zoom factors is D1, the air interval between the fifth lens and the sixth lens on the optical axis at different zoom factors is D2, and the air interval between the seventh lens and the filter on the optical axis at different zoom factors is D3.

[0175]

[0176] Table 14 As shown in Table 15, the specific values ​​of each conditional expression in Example 4 all satisfy the relationship of the conditional expression.

[0177] Conditional / zoom factor 3X 4X 5X |R1 / f1| 5.31 5.31 5.31 <![CDATA[|FOV w |(°)]]> 34.3 25.8 20.6 R2 / R3 1.11 1.11 1.11 f2 / R4 5.78 5.78 5.78 <![CDATA[f w / EPD w ]]> 2.85 3.41 3.89 f3 / R5 1.65 1.65 1.65 |R7 / f4| 3.60 3.60 3.60 R9 / R8 1.49 1.49 1.49 R10 / f5 -1.56 -1.56 -1.56 DT72 / DT61 1.03 1.03 1.03 CT3 / CT1 2.90 2.90 2.90 CT5 / CT4 3.24 3.24 3.24 CT7 / CT2 1.34 1.34 1.34 D1 / D2 1.72 1.21 0.40 <![CDATA[f w / D3×Tan(HFOV w )]]> 3.90 1.11 0.66

[0178] Table 15

[0179] 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 16 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 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0180]

[0181]

[0182] Table 16

[0183] Fig.22a The axial chromatic aberration curve of the zoom lens group of Example 4 at the 3x zoom position is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 22b The astigmatism curve of the zoom lens group of Example 4 at the 3x zoom position is shown, which indicates the meridional image plane curvature and the sagittal image plane curvature. Fig.22c The distortion curve of the zoom lens group of Example 4 at the 3x zoom position is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.22d The chromatic aberration curve of the zoom lens group of Example 4 at the 3x zoom position is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens.

[0184] Fig.23a The axial chromatic aberration curve of the zoom lens group of Example 4 at the 4x zoom position is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 23b The astigmatism curve of the zoom lens group of Example 4 at the 4x zoom position is shown, which indicates the meridional image plane curvature and the sagittal image plane curvature. Fig.23c The distortion curve of the zoom lens group of Example 4 at the 4x zoom position is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.23d The chromatic aberration curve of the zoom lens group of Example 4 at the 4x zoom position is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens.

[0185] Fig.24a The axial chromatic aberration curve of the zoom lens group of Example 4 at the 5x zoom position is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Figure 24bThe astigmatism curve of the zoom lens group of Example 4 at the 5x zoom position is shown, which indicates the meridional image plane curvature and the sagittal image plane curvature. Fig.24c The distortion curve of the zoom lens group of Example 4 at the 5x zoom position is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.24d The chromatic aberration curve of the zoom lens group of Example 4 at the 5x zoom position is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens.

[0186] As shown in FIG. 22 to FIG. 24 , it can be seen that the zoom lens group provided in Example 4 can achieve good imaging quality. Specific embodiment 5

[0188] Fig.25 3x zoom position structure diagram of zoom lens assembly embodiment 5 of the present invention, Fig.26 4 is a schematic diagram of the 4x zoom position structure of the zoom lens assembly embodiment 5 of the present invention, Fig. 27 Schematic diagram of the 5x zoom position structure of the zoom lens assembly embodiment 5 of the present invention.

[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 front fixed group G1, a zoom group G2, a compensation group G3, a filter E8 and an imaging surface S17. The front fixed group G1 includes a first lens E1 and a second lens E2, the zoom group G2 includes a stop, a third lens E3, a fourth lens E4 and a fifth lens E5, and the compensation group G3 includes a sixth lens E6 and a seventh lens E7.

[0190] The first lens E1 has negative power, and its object side surface S1 is convex, 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 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 E8 has an object side surface S15 and an image side surface S16. The light from the object passes through each surface of the surfaces S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0191] As shown in Table 17, it is a structural parameter table of the zoom lens group of Example 5, wherein the units of the curvature radius and thickness are both millimeters (mm).

[0192]

[0193]

[0194] Table 17

[0195] As shown in Table 18, in Example 5, the total focal length of the zoom lens group at different zoom factors is f w , numerical aperture is Fno w , Maximum field of view FOV of zoom lens group at different zoom factors w , the air interval between the second lens and the aperture on the optical axis at different zoom factors is D1, the air interval between the fifth lens and the sixth lens on the optical axis at different zoom factors is D2, and the air interval between the seventh lens and the filter on the optical axis at different zoom factors is D3.

[0196]

[0197] Table 18 As shown in Table 19, the specific values ​​of each conditional expression in Example 5 all satisfy the relationship of the conditional expression.

[0198] Conditional / zoom factor 3X 4X 5X |R1 / f1| 4.49 4.49 4.49 <![CDATA[|FOV w |(°)]]> 34.7 26.2 20.9 R2 / R3 1.09 1.09 1.09 f2 / R4 5.43 5.43 5.43 <![CDATA[f w / EPD w ]]> 2.82 3.40 3.89 f3 / R5 1.49 1.49 1.49 |R7 / f4| 3.97 3.97 3.97 R9 / R8 1.02 1.02 1.02 R10 / f5 -2.08 -2.08 -2.08 DT72 / DT61 1.22 1.22 1.22 CT3 / CT1 3.85 3.85 3.85 CT5 / CT4 1.60 1.60 1.60 CT7 / CT2 1.98 1.98 1.98 D1 / D2 1.72 1.35 0.27 <![CDATA[f w / D3×Tan(HFOV w )]]> 3.86 1.02 0.71

[0199] Table 19

[0200] 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 20 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, A59, A60, A61, A71, A72, A73, A74, A75 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0201]

[0202]

[0203] Table 20

[0204] Fig.28a The axial chromatic aberration curve of the zoom lens group of Example 5 at the 3x zoom position is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Fig.28b The astigmatism curve of the zoom lens group of Example 5 at the 3x zoom position is shown, which indicates the meridional image plane curvature and the sagittal image plane curvature. Fig.28cThe distortion curve of the zoom lens group of Example 5 at the 3x zoom position is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.28d The chromatic aberration curve of the zoom lens group of Example 5 at the 3x zoom position is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens.

[0205] Fig.29a The axial chromatic aberration curve of the zoom lens group of Example 5 at the 4x zoom position is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Fig.29b The astigmatism curve of the zoom lens group of Example 5 at the 4x zoom position is shown, which indicates the meridional image plane curvature and the sagittal image plane curvature. Fig.29c The distortion curve of the zoom lens group of Example 5 at the 4x zoom position is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.29d The chromatic aberration curve of the zoom lens group of Example 5 at the 4x zoom position is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens.

[0206] Fig.30a The axial chromatic aberration curve of the zoom lens group of Example 5 at the 5x zoom position is shown, which indicates that light of different wavelengths deviates from the focal point behind the lens. Fig.30b The astigmatism curve of the zoom lens group of Example 5 at the 5x zoom position is shown, which indicates the meridional image plane curvature and the sagittal image plane curvature. Fig.30c The distortion curve of the zoom lens group of Example 5 at the 5x zoom position is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Fig.30d The chromatic aberration curve of the zoom lens group of Example 5 at the 5x zoom position is shown, which represents the deviation of different image heights on the imaging plane after the light passes through the lens.

[0207] As shown in FIG. 28 to FIG. 30 , it can be seen that the zoom lens group provided in Example 5 can achieve good imaging quality.

[0208] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, improvements, equivalent substitutions, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A zoom lens assembly, characterized in that: Along the optical axis from the object side to the image side, it consists of three parts: A first front fixed group G1, wherein the first front fixed group G1 is composed of a first lens and a second lens; A first lens having negative optical power, whose image side surface is concave; The second lens has positive refractive power, and its object side surface is convex and its image side surface is concave; A second partial zoom group G2, which consists of an aperture stop, a third lens with positive power, a fourth lens with negative power, and a fifth lens; The third lens has positive power and its object side surface is convex; a fourth lens element having negative optical power and a concave image-side surface; a fifth lens having positive refractive power, whose object-side surface is convex and whose image-side surface is convex; A third partial compensation group G3, wherein the third partial compensation group G3 consists of a sixth lens and a seventh lens; a sixth lens having positive or negative power, whose image side surface is convex; The seventh lens element has a negative optical power and its image side surface is concave; Among them, the lenses are not attached to each other, and the compensation group G3 moves along the optical axis with the zoom group G2; the curvature radius R1 of the object side of the first lens and the effective focal length f1 of the first lens satisfy: 4.49≤|R1 / f1|<6.0; the curvature radius R2 of the image side of the first lens and the curvature radius R3 of the object side of the second lens satisfy: 1.0 <R2 / R3≤1.23。 2. The zoom lens assembly according to claim 1, characterized in that: The maximum field of view FOV of the zoom lens group at different zoom factors w Satisfies: 20.4°≤|FOV w |≤35.4°.

3. The zoom lens assembly according to claim 1, wherein: The effective focal length f2 of the second lens and the curvature radius R4 of the image side surface of the second lens satisfy: 4.5≤f2 / R4≤5.

78.

4. 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 w Satisfies: 2.82≤f w / EPD w ≤3.

89.

5. The zoom lens assembly according to claim 1, wherein: The effective focal length f3 of the third lens and the curvature radius R5 of the object side surface of the third lens satisfy: 1.49≤f3 / R5≤2.

6. The zoom lens assembly according to claim 1, wherein: The curvature radius R7 of the object side of the fourth lens and the effective focal length f4 of the fourth lens satisfy: 1.43≤|R7 / f4|<4.

0.

7. The zoom lens assembly according to claim 1, wherein: The curvature radius R9 of the object side of the fifth lens and the curvature radius R8 of the image side of the fourth lens satisfy: 1.0 <R9 / R8<1.5。 8. The zoom lens assembly according to claim 1, wherein: The curvature radius R10 of the image side surface of the fifth lens and the effective focal length f5 of the fifth lens satisfy: -3.5 <R10 / f5≤-1.56。 9. The zoom lens assembly according to claim 1, wherein: The maximum effective radius DT72 of the image side of the seventh lens and the maximum effective radius DT61 of the object side of the sixth lens satisfy: 1.0 <DT72 / DT61≤1.22。 10. The zoom lens assembly according to claim 1, wherein: A center thickness CT3 of the third lens on the optical axis and a center thickness CT1 of the first lens on the optical axis satisfy: 2.9≤CT3 / CT1≤3.

85.

11. The zoom lens assembly according to claim 1, wherein: A center thickness CT5 of the fifth lens on the optical axis and a center thickness CT4 of the fourth lens on the optical axis satisfy: 1.6≤CT5 / CT4≤3.

67.

12. The zoom lens assembly according to claim 1, wherein: A center thickness CT7 of the seventh lens on the optical axis and a center thickness CT2 of the second lens on the optical axis satisfy the condition: 1.34≤CT7 / CT2≤2.

13.

13. The zoom lens assembly according to claim 1, wherein: The air interval D1 between the second lens and the aperture on the optical axis at different zoom magnifications and the air interval D2 between the fifth lens and the sixth lens on the optical axis at different zoom magnifications satisfy the conditional formula: 0.27≤D1 / D2≤1.

8.

14. 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 interval D3 between the seventh lens and the filter on the optical axis at different zoom magnifications, and the half maximum field of view HFOV of the zoom lens group at different zoom magnifications w The conditional formula satisfied is: 0.66≤f w / D3×Tan(HFOV w )≤3.92.

Images