Zoom lens

Abstract

The present application discloses a zoom lens, which comprises, in order from the object side to the image side along the optical axis: a first lens group with positive optical focal length, which comprises a first lens arranged along the optical axis; and a second lens group with negative optical focal length, which comprises a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged in order along the optical axis; the positions of the second lens to the seventh lens on the optical axis are changed to achieve continuous zooming of the zoom lens; the total effective focal length ft of the zoom lens in the final state and the total effective focal length fs of the zoom lens in the initial state satisfy: 1.3<ft / fs<1.5.

Description

Technical Field

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

[0002] With the development of science and technology, the development of lenses for portable electronic products such as mobile phones is also advancing by leaps and bounds. Nowadays, in order to achieve the zoom photography effect, portable electronic products such as mobile phones usually adopt the solution of "baton" zoom, that is, the zoom effect is simulated by switching between three lenses: "wide-angle lens, standard lens and telephoto lens".

[0003] However, the disadvantages of this multi-lens solution are very obvious. First, multiple lenses need to be switched when simulating zoom effects, making the zoom discontinuous. At the same time, lens switching will cause unstable white balance, and the intuitive effect is unsatisfactory when used. Secondly, the principle of digital crop zoom is still used when the focal length switches from wide-angle state to standard state or from standard state to telephoto state, which has a great loss in performance. Summary of the invention

[0004] On one hand, the present application provides a zoom lens, which includes, in sequence from the object side to the image side along the optical axis: a first lens group with positive optical power, which includes a first lens arranged along the optical axis; and a second lens group with negative optical power, which includes a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged in sequence along the optical axis; the positions of the first lens to the seventh lens on the optical axis are changed to achieve continuous zooming of the zoom lens; the total effective focal length ft of the zoom lens in the final state and the total effective focal length fs of the zoom lens in the initial state can satisfy the following: 1.3<ft / fs<1.5.

[0005] In one embodiment, there is at least one aspherical mirror surface from the object side surface of the first lens to the image side surface of the seventh lens.

[0006] In one embodiment, the difference △f between the total effective focal length when the zoom lens is in the initial state and the total effective focal length when the zoom lens is in the final state and the difference △TTL between the distance from the object side surface of the first lens to the imaging surface of the zoom lens on the optical axis when the zoom lens is in the initial state and the distance from the object side surface of the first lens to the imaging surface of the zoom lens on the optical axis when the zoom lens is in the final state may satisfy: 1.5<|△f| / |△TTL|<2.0.

[0007] In one embodiment, the difference Δf between the effective focal length F1 of the first lens group and the total effective focal length of the zoom lens in the initial state and the total effective focal length of the zoom lens in the final state may satisfy: 1.2<F1 / |Δf|<1.5.

[0008] In one embodiment, the effective focal length F1 of the first lens group and the effective focal length F2 of the second lens group may satisfy: -1.6≤F1 / F2<-1.4.

[0009] In one embodiment, the difference Δf between the total effective focal length of the zoom lens in the initial state and the total effective focal length of the zoom lens in the final state and the center thickness CT1 of the first lens on the optical axis may satisfy: 2.0<|Δf| / CT1<2.6.

[0010] In one embodiment, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, and the effective focal length f5 of the fifth lens may satisfy: -1.0<(f2-f3) / (f4-f5)<-0.5.

[0011] In one embodiment, the total effective focal length ft, the effective focal length f6 of the sixth lens, and the effective focal length f7 of the seventh lens when the zoom lens is in the final state may satisfy: 0.2<ft / (f6-f7)<1.0.

[0012] In one embodiment, the zoom lens further includes an aperture stop disposed between the third lens and the fourth lens. When the zoom lens is zooming, the aperture stop is movable along the optical axis.

[0013] In one embodiment, a curvature radius R7 of the object-side surface of the fourth lens and a curvature radius R8 of the image-side surface of the fourth lens may satisfy: -2.5<R7 / R8<-1.0.

[0014] In one embodiment, the sum ΣCT of the center thicknesses of the first to seventh lenses on the optical axis, the center thickness CT5 of the fifth lens on the optical axis, and the center thickness CT6 of the sixth lens on the optical axis may satisfy: 2.0<ΣCT / (CT5+CT6)<3.0.

[0015] In one embodiment, a distance T56 between the fifth lens and the sixth lens on the optical axis, a distance T67 between the sixth lens and the seventh lens on the optical axis, and a sum ∑AT of distances between any two adjacent lenses from the first lens to the seventh lens on the optical axis may satisfy: 0.5<(T56+T67) / ∑AT<0.7.

[0016] In one embodiment, the spacing distance T12s between the first lens and the second lens on the optical axis when the zoom lens is in an initial state, the spacing distance T23s between the second lens and the third lens on the optical axis when the zoom lens is in the initial state, the spacing distance T12t between the first lens and the second lens on the optical axis when the zoom lens is in a final state, and the spacing distance T23t between the second lens and the third lens on the optical axis when the zoom lens is in the final state may satisfy: 0.9<(T12s+T23s) / (T12t+T23t)<1.1.

[0017] The present application provides a zoom lens having at least one of continuous zoom, miniaturization and good imaging quality by reasonably allocating optical focal length and optimizing optical parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0019] Figure 1 A schematic structural diagram of a zoom lens in an initial state according to Embodiment 1 of the present application is shown;

[0020] Figure 2 A schematic structural diagram of a zoom lens in a final state according to Embodiment 1 of the present application is shown;

[0021] FIG. 3A to FIG. 3C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the zoom lens of Example 1 in the initial state are respectively shown;

[0022] FIG. 4A to FIG. 4C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the zoom lens of Example 1 when it is in the final state are respectively shown;

[0023] Figure 5 A schematic structural diagram of a zoom lens in an initial state according to Embodiment 2 of the present application is shown;

[0024] Figure 6 A schematic structural diagram of a zoom lens in a final state according to Embodiment 2 of the present application is shown;

[0025] 7A to 7C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the zoom lens of Example 2 in the initial state are respectively shown;

[0026] FIG. 8A to FIG. 8C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the zoom lens of Example 2 are respectively shown when the zoom lens is in the final state;

[0027] Fig. 9A schematic structural diagram of a zoom lens in an initial state according to Embodiment 3 of the present application is shown;

[0028] Fig.10 A schematic structural diagram of a zoom lens in a final state according to Embodiment 3 of the present application is shown;

[0029] FIG. 11A to FIG. 11C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the zoom lens of Example 3 when it is in the initial state are respectively shown;

[0030] FIG. 12A to FIG. 12C The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the zoom lens of Example 3 when it is in the final state are respectively shown;

[0031] Fig.13 A schematic structural diagram of a zoom lens in an initial state according to Embodiment 4 of the present application is shown;

[0032] Fig.14 A schematic structural diagram of a zoom lens in a final state according to Embodiment 4 of the present application is shown;

[0033] FIG. 15A to FIG. 15C axial chromatic aberration curve, astigmatism curve and distortion curve of the zoom lens of Example 4 in an initial state are respectively shown; and

[0034] FIG. 16A to FIG. 16C The axial chromatic aberration curve, astigmatism curve, and distortion curve of the zoom lens of Example 4 in the final state are respectively shown. DETAILED DESCRIPTION

[0035] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0036] 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 application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0037] 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.

[0038] In this article, 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.

[0039] 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.

[0040] 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 sense unless explicitly defined in this article.

[0041] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0042] The features, principles and other aspects of the present application are described in detail below.

[0043] The zoom lens according to the exemplary embodiment of the present application may include seven lenses having optical power, namely a first lens group including a first lens, a second lens group including a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The seven lenses are arranged in order from the object side to the image side along the optical axis.

[0044] In an exemplary embodiment, the first lens group may have positive power, and the second lens group may have negative power. The first lens group has positive power, and the second lens group has negative power, which is beneficial to balance aberrations and improve imaging quality.

[0045] In an exemplary embodiment, the continuous zooming of the zoom lens can be achieved by changing the positions of the first lens to the seventh lens on the optical axis, that is, adjusting the interval between any two adjacent lenses of the first lens to the seventh lens on the optical axis.

[0046] In an exemplary embodiment, the zoom lens according to the present application may satisfy: 1.3<ft / fs<1.5, where ft is the total effective focal length of the zoom lens when it is in the final state, and fs is the total effective focal length of the zoom lens when it is in the initial state. Satisfying 1.3<ft / fs<1.5 can enable the zoom lens to have a stronger zoom capability and a wider zoom range. The initial state may be a state in which the zoom lens has a relatively short focal length (compared to the final state). The final state may be a state in which the zoom lens has a relatively long focal length (compared to the initial state).

[0047] In an exemplary embodiment, the zoom lens according to the present application may satisfy: 1.5<|△f| / |△TTL|<2.0, wherein △f is the difference between the total effective focal length of the zoom lens when it is in the initial state and the total effective focal length of the zoom lens when it is in the final state, and △TTL is the difference between the distance on the optical axis from the object side of the first lens to the imaging surface of the zoom lens when the zoom lens is in the initial state and the distance on the optical axis from the object side of the first lens to the imaging surface of the zoom lens when the zoom lens is in the final state. More specifically, △f and △TTL may further satisfy: 1.6<|△f| / |△TTL|<1.9. Satisfying 1.5<|△f| / |△TTL|<2.0 is conducive to reasonably controlling the total length of the zoom lens, so that when the focal length increases, the change in the total length of the zoom lens is small, which can effectively reduce the travel of the zoom group during zooming.

[0048] In an exemplary embodiment, the zoom lens according to the present application may satisfy: 1.2<F1 / |△f|<1.5, where F1 is the effective focal length of the first lens group, and △f is the difference between the total effective focal length when the zoom lens is in the initial state and the total effective focal length when the zoom lens is in the final state. Satisfying 1.2<F1 / |△f|<1.5 is conducive to controlling the effective focal length of the first lens group, so that the first lens group has a reasonable optical focal length, and the remaining optical focal length is borne by the second lens group, which can effectively improve the zoom capability of the zoom optical system.

[0049] In an exemplary embodiment, the zoom lens according to the present application may satisfy: -1.6≤F1 / F2<-1.4, where F1 is the effective focal length of the first lens group, and F2 is the effective focal length of the second lens group. Satisfying -1.6≤F1 / F2<-1.4 is conducive to reasonably allocating the optical power of the first lens group and the second lens group, and is also conducive to controlling the optical power of the second lens group, which can effectively improve the zoom capability of the optical system.

[0050] In an exemplary embodiment, the zoom lens according to the present application may satisfy: 2.0<|△f| / CT1<2.6, wherein △f is the difference between the total effective focal length of the zoom lens in the initial state and the total effective focal length of the zoom lens in the final state, and CT1 is the center thickness of the first lens on the optical axis. More specifically, △f and CT1 may further satisfy: 2.3<|△f| / CT1<2.6. Satisfying 2.0<|△f| / CT1<2.6 is conducive to controlling the proportion of the thickness of the first lens group in the entire optical system, and can effectively control the volume of the entire optical system.

[0051] In an exemplary embodiment, the zoom lens according to the present application may satisfy: -1.0<(f2-f3) / (f4-f5)<-0.5, wherein f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, and f5 is the effective focal length of the fifth lens. More specifically, f2, f3, f4, and f5 may further satisfy: -1.0<(f2-f3) / (f4-f5)<-0.7. Satisfying -1.0<(f2-f3) / (f4-f5)<-0.5 can effectively control the optical power of the second lens, the third lens, the fourth lens, and the fifth lens, can better balance the aberrations between the second lens group, and improve the imaging quality.

[0052] In an exemplary embodiment, the zoom lens according to the present application may satisfy: 0.2<ft / (f6-f7)<1.0, where ft is the total effective focal length of the zoom lens in the final state, f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens. More specifically, ft, f6, and f7 may further satisfy: 0.2<ft / (f6-f7)<0.7. Satisfying 0.2<ft / (f6-f7)<1.0 can effectively control the optical power of the sixth lens and the seventh lens, can better balance the aberrations between the second lens group, and improve the imaging quality.

[0053] In an exemplary embodiment, the zoom lens according to the present application may satisfy: -2.5<R7 / R8<-1.0, wherein R7 is the radius of curvature of the object side surface of the fourth lens, and R8 is the radius of curvature of the image side surface of the fourth lens. More specifically, R7 and R8 may further satisfy: -2.2<R7 / R8<-1.2. Satisfying -2.5<R7 / R8<-1.0 is conducive to controlling the optical power of the fourth lens, and can better balance the aberrations between the second lens groups, thereby improving the imaging quality.

[0054] In an exemplary embodiment, the zoom lens according to the present application may satisfy: 2.0<∑CT / (CT5+CT6)<3.0, wherein ∑CT is the sum of the center thicknesses of the first lens to the seventh lens on the optical axis, CT5 is the center thickness of the fifth lens on the optical axis, and CT6 is the center thickness of the sixth lens on the optical axis. More specifically, ∑CT, CT5, and CT6 may further satisfy: 2.1<∑CT / (CT5+CT6)<2.8. Satisfying 2.0<∑CT / (CT5+CT6)<3.0 is conducive to reducing the total length of the entire optical system, can effectively reduce the volume of the optical module, and can also reduce the amount of movement of the first lens to the seventh lens during the zooming process.

[0055] In an exemplary embodiment, the zoom lens according to the present application may satisfy: 0.5<(T56+T67) / ∑AT<0.7, wherein T56 is the distance between the fifth lens and the sixth lens on the optical axis, T67 is the distance between the sixth lens and the seventh lens on the optical axis, and ∑AT is the sum of the distances between any two adjacent lenses from the first lens to the seventh lens on the optical axis. Satisfying 0.5<(T56+T67) / ∑AT<0.7 is conducive to reducing the total length of the entire optical system, can effectively reduce the volume of the optical module, and can reduce the volume of the second lens group, which is conducive to the design of the motor driving the zoom in the zoom system.

[0056] In an exemplary embodiment, the zoom lens according to the present application may satisfy: 0.9<(T12s+T23s) / (T12t+T23t)<1.1, wherein T12s is the distance between the first lens and the second lens on the optical axis when the zoom lens is in an initial state, T23s is the distance between the second lens and the third lens on the optical axis when the zoom lens is in an initial state, T12t is the distance between the first lens and the second lens on the optical axis when the zoom lens is in a final state, and T23t is the distance between the second lens and the third lens on the optical axis when the zoom lens is in a final state. Satisfying 0.9<(T12s+T23s) / (T12t+T23t)<1.1 is conducive to controlling the movement of the zoom group of the zoom system during the zooming process to be smaller, thereby helping to reduce the volume of the entire lens module, saving space, and at the same time facilitating the design of a drive zoom motor.

[0057] In an exemplary embodiment, the zoom lens according to the present application further includes an aperture arranged between the third lens and the fourth lens. In the process of realizing zooming of the zoom lens, the aperture is movable along the optical axis. Arranging the aperture between the third lens and the fourth lens is conducive to reducing the size of the zoom lens. At the same time, the aperture is located in the middle position of the optical system, which can make the optical system have a front-to-back symmetrical structure, which is conducive to balancing aberrations; and the aperture can be moved along the optical axis during the zooming process, which is conducive to blocking part of the light during the zooming process and improving the imaging quality. Optionally, the above-mentioned zoom lens may also include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface. The present application can adjust the spacing distance between any two adjacent lenses of the first lens to the seventh lens on the optical axis and the spacing distance between the seventh lens and the filter and / or the protective glass on the optical axis by changing the position of the first lens to the seventh lens on the optical axis, so as to realize continuous zooming of the zoom lens. The present application proposes a zoom lens with the characteristics of continuous zooming, miniaturization, high imaging quality, etc. The zoom lens according to the above-mentioned embodiment of the present application may use multiple lenses, such as the seven lenses mentioned above. By reasonably allocating the focal length, surface shape, center thickness of each lens, and axial spacing between lenses, etc., the incident light can be effectively converged, the total optical length of the imaging lens can be reduced, and the processability of the imaging lens can be improved, making the zoom lens more conducive to production and processing.

[0058] In the embodiment of the present application, 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 the aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens with 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.

[0059] However, it should be understood by those skilled in the art that, without departing from the technical solution claimed in the present application, the number of lenses constituting the zoom lens 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 is not limited to including seven lenses. If necessary, the zoom lens may also include other numbers of lenses.

[0060] Specific embodiments of the zoom lens applicable to the above-mentioned embodiments will be further described below with reference to the accompanying drawings.

[0061] Example 1

[0062] The following reference Figures 1 to 4C A zoom lens according to Embodiment 1 of the present application is described. Figure 1 A schematic structural diagram of a zoom lens in an initial state according to Embodiment 1 of the present application is shown. Figure 2 A schematic structural diagram of a zoom lens in a final state according to Embodiment 1 of the present application is shown.

[0063] like Figure 1 and Figure 2 As shown, the zoom lens includes, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, an aperture STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8 and an imaging surface S17.

[0064] The first lens E1 has positive power, and its object side surface S1 is convex, and its image side surface S2 is convex. The second lens E2 has negative power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has negative 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 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 negative power, and its object side surface S11 is concave, and its image side surface S12 is concave. 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 S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0065] Table 1 shows basic parameters of the zoom lens of Example 1, wherein the units of the curvature radius, thickness / distance and focal length are all millimeters (mm).

[0066]

[0067] Table 1

[0068] In this example, by changing the spacing distance T1 between the first lens and the second lens on the optical axis (i.e., the spacing distance between the image side surface of the first lens E1 and the object side surface of the second lens E2 on the optical axis), the spacing distance T2 between the second lens and the third lens on the optical axis (i.e., the spacing distance between the image side surface of the second lens E2 and the object side surface of the third lens E3 on the optical axis), the spacing distance T3 between the third lens and the fourth lens on the optical axis (i.e., the spacing distance between the image side surface of the third lens E3 and the object side surface of the fourth lens E4 on the optical axis), and the spacing distance T4 between the fourth lens and the fifth lens on the optical axis (i.e., the spacing distance between the image side surface of the fourth lens E4 and the object side surface of the fifth lens E4 on the optical axis). The zoom lens is switched from the initial state to the final state or from the final state to the initial state by using the distance T5 between the fifth lens and the sixth lens on the optical axis (i.e., the distance between the image side surface of the fifth lens E5 and the object side surface of the sixth lens E6 on the optical axis), the distance T6 between the sixth lens and the seventh lens on the optical axis (i.e., the distance between the image side surface of the sixth lens E6 and the object side surface of the seventh lens E7 on the optical axis), and the distance T7 between the seventh lens and the filter on the optical axis (i.e., the distance between the image side surface of the seventh lens E7 and the object side surface of the filter E8 on the optical axis).

[0069] Table 2 shows specific parameter values ​​of the spacing distances T1-T7 between any two adjacent lenses from the first lens to the filter on the optical axis when the zoom lens of Example 1 is in the initial state and the final state, wherein the units of T1, T2, T3, T4, T5, T6 and T7 are all millimeters (mm).

[0070] T1 T2 T3 T4 T5 T6 T7 Initial state 0.6001 0.4973 0.1000 0.1716 2.7179 0.1000 0.1000 Final State 0.1000 0.9852 0.1888 0.3917 0.3920 3.0587 2.0145

[0071] Table 2

[0072] In this example, the total effective focal length fs of the zoom lens in the initial state is 13.00 mm, the total effective focal length ft of the zoom lens in the final state is 18.22 mm, the maximum field of view FOVs of the zoom lens in the initial state is 34.4°, and the maximum field of view FOVt of the zoom lens in the final state is 25.1°. The zoom lens can achieve continuous zooming within the focal length range of 13.00 mm-18.22 mm.

[0073] In Example 1, the object-side surface and the image-side surface of the first lens E1 to the seventh lens E7 are all aspherical surfaces, and the surface shape x of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0074]

[0075] 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 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 3 below gives 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, A50, A51, A52, A53, A54, A55, A56, A57, A58, A59, A60, A61, A71, A72, A73, A74, A75, A76, A77, A8, A9, A10, A11, A12, A13, A14, A15 10 , A 12 , A 14 , A 16 , A 18 and A 20 .

[0076]

[0077]

[0078] Table 3

[0079] Figure 3A and Figure 4A The axial chromatic aberration curves of the zoom lens of Example 1 in the initial state and the final state are respectively shown, which indicate that light rays of different wavelengths deviate from the focal point behind the lens. Figure 3B and Figure 4B Astigmatism curves are shown when the zoom lens of Example 1 is in an initial state and a final state, respectively, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 3C and Figure 4C The distortion curves of the zoom lens of Example 1 in the initial state and the final state are shown respectively, which represent the distortion magnitude values ​​corresponding to different image heights. FIG. 3A to FIG. 4C It can be seen that the zoom lens provided in Example 1 can achieve good imaging quality in all states.

[0080] Example 2

[0081] The following reference Figures 5 to 8C A zoom lens according to Embodiment 2 of the present application is described. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to Embodiment 1 will be omitted. Figure 5 A schematic structural diagram of a zoom lens in an initial state according to Embodiment 2 of the present application is shown. Figure 6 A schematic structural diagram of a zoom lens in a final state according to Embodiment 2 of the present application is shown.

[0082] like Figure 5 and Figure 6As shown, the zoom lens includes, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, an aperture STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8 and an imaging surface S17.

[0083] The first lens E1 has positive power, and its object side surface S1 is convex, and its image side surface S2 is convex. The second lens E2 has negative power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has negative 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 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 negative power, and its object side surface S11 is concave, and its image side surface S12 is concave. 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 S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0084] In this example, the total effective focal length fs of the zoom lens in the initial state is 13.27 mm, the total effective focal length ft of the zoom lens in the final state is 18.19 mm, the maximum field of view FOVs of the zoom lens in the initial state is 34.5°, and the maximum field of view FOVt of the zoom lens in the final state is 25.1°. The zoom lens can achieve continuous zooming within the focal length range of 13.27 mm-18.19 mm.

[0085] Table 4 shows basic parameter tables of the zoom lens of Example 2, wherein the units of the curvature radius, thickness / distance and focal length are all millimeters (mm).

[0086]

[0087]

[0088] Table 4

[0089] In this example, by changing the spacing distance T1 between the first lens and the second lens on the optical axis (i.e., the spacing distance between the image side surface of the first lens E1 and the object side surface of the second lens E2 on the optical axis), the spacing distance T2 between the second lens and the third lens on the optical axis (i.e., the spacing distance between the image side surface of the second lens E2 and the object side surface of the third lens E3 on the optical axis), the spacing distance T3 between the third lens and the fourth lens on the optical axis (i.e., the spacing distance between the image side surface of the third lens E3 and the object side surface of the fourth lens E4 on the optical axis), and the spacing distance T4 between the fourth lens and the fifth lens on the optical axis (i.e., the spacing distance between the image side surface of the fourth lens E4 and the object side surface of the fifth lens E4 on the optical axis). The zoom lens is switched from the initial state to the final state or from the final state to the initial state by using the distance T5 between the fifth lens and the sixth lens on the optical axis (i.e., the distance between the image side surface of the fifth lens E5 and the object side surface of the sixth lens E6 on the optical axis), the distance T6 between the sixth lens and the seventh lens on the optical axis (i.e., the distance between the image side surface of the sixth lens E6 and the object side surface of the seventh lens E7 on the optical axis), and the distance T7 between the seventh lens and the filter on the optical axis (i.e., the distance between the image side surface of the seventh lens E7 and the object side surface of the filter E8 on the optical axis).

[0090] Table 5 shows specific parameter values ​​of the spacing distances T1-T7 between any two adjacent lenses from the first lens to the filter on the optical axis when the zoom lens of Example 2 is in the initial state and the final state, wherein the units of T1, T2, T3, T4, T5, T6 and T7 are all millimeters (mm).

[0091] T1 T2 T3 T4 T5 T6 T7 Initial state 0.5824 0.4925 0.1005 0.1858 2.6187 0.1000 0.3332 Final State 0.1000 0.9864 0.1917 0.4053 0.3827 2.8923 2.3156

[0092] Table 5

[0093] Table 6 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 2, wherein each aspherical surface shape can be defined by the formula (1) given in the above-mentioned Example 1.

[0094] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -1.1343E-01 -3.4153E-02 -1.2465E-02 -4.9526E-03 -1.3579E-03 -3.4524E-04 -1.0256E-04 -1.0037E-07 -7.4684E-05 S2 8.6378E-02 -1.4232E-02 -6.9239E-03 4.3755E-04 -1.1657E-04 1.5641E-04 1.3908E-04 -4.8287E-06 7.3804E-05 S3 2.4843E-02 1.5508E-02 -7.4105E-03 3.3030E-03 -1.9704E-03 2.6596E-04 -1.4487E-04 -4.2114E-05 1.1195E-04 S4 6.7368E-03 1.3643E-02 -4.5113E-03 2.6347E-03 -1.2666E-03 -1.6812E-05 -8.8969E-05 -1.2334E-04 5.3903E-05 S5 7.2257E-02 4.1643E-03 -8.4431E-04 1.1337E-03 1.3112E-04 1.2604E-04 -7.7717E-05 -2.0120E-05 -1.4352E-05 S6 2.7950E-03 -1.4177E-03 -5.0538E-04 -3.9594E-04 1.6488E-04 1.8908E-04 0.0000E+00 0.0000E+00 0.0000E+00 S7 -8.7654E-03 -9.0491E-04 -4.9719E-04 8.5272E-04 -3.8661E-04 3.8445E-04 -4.9661E-05 0.0000E+00 0.0000E+00 S8 -6.0667E-04 -5.7024E-03 -2.8476E-03 2.0857E-03 -1.4653E-03 4.2896E-04 -8.0731E-05 0.0000E+00 0.0000E+00 S9 -9.8700E-02 -9.7706E-03 -4.0299E-03 6.8655E-04 -9.3707E-04 1.2331E-04 0.0000E+00 0.0000E+00 0.0000E+00 S10 -7.5331E-03 5.1056E-03 7.3774E-04 1.7789E-04 -5.1915E-05 7.7546E-05 0.0000E+00 0.0000E+00 0.0000E+00 S11 -2.1804E-01 1.1774E-01 2.6779E-02 -1.4647E-02 4.6411E-03 -3.5835E-03 1.5684E-03 -2.9858E-04 7.4289E-06 S12 -1.2807E-01 -4.4552E-02 1.4192E-02 -3.0468E-03 3.1009E-04 4.0434E-05 -1.9363E-05 2.5283E-06 -1.1326E-07 S13 -5.9922E-02 -2.5627E-02 -3.5859E-03 4.3160E-03 -1.3581E-03 2.7096E-04 -3.5287E-05 2.5917E-06 -7.9211E-08 S14 -3.0502E-01 1.3111E-02 -1.4713E-02 5.8729E-03 -1.0607E-03 5.5696E-05 2.0309E-05 -4.2821E-06 2.4655E-07

[0095] Table 6

[0096] Fig. 7A and Fig. 8A The axial chromatic aberration curves of the zoom lens of Example 2 in the initial state and the final state are respectively shown, which indicate that light rays of different wavelengths deviate from the focal point behind the lens. Figure 7B and Figure 8B Astigmatism curves are shown when the zoom lens of Example 2 is in an initial state and a final state, respectively, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 7C and Figure 8CThe distortion curves of the zoom lens of Example 2 in the initial state and the final state are shown respectively, which represent the distortion magnitude values ​​corresponding to different image heights. 7A to 8C It can be seen that the zoom lens provided in Example 2 can achieve good imaging quality in all states.

[0097] Example 3

[0098] The following reference Figures 9 to 12C A zoom lens according to Embodiment 3 of the present application is described. Fig. 9 A schematic structural diagram of a zoom lens in an initial state according to Embodiment 3 of the present application is shown. Fig.10 A schematic structural diagram of a zoom lens in a final state according to Embodiment 3 of the present application is shown.

[0099] like Fig. 9 and Fig.10 As shown, the zoom lens includes, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, an aperture STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8 and an imaging surface S17.

[0100] The first lens E1 has positive power, and its object side surface S1 is convex, and its image side surface S2 is convex. The second lens E2 has negative power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has negative 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 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 negative power, and its object side surface S11 is concave, and its image side surface S12 is concave. 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 S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0101] In this example, the total effective focal length fs of the zoom lens in the initial state is 13.48 mm, the total effective focal length ft of the zoom lens in the final state is 18.31 mm, the maximum field of view FOVs of the zoom lens in the initial state is 34.2°, and the maximum field of view FOVt of the zoom lens in the final state is 24.8°. The zoom lens can achieve continuous zooming within the focal length range of 13.48 mm-18.31 mm.

[0102] Table 7 shows the basic parameters of the zoom lens of Example 3, wherein the units of the curvature radius, thickness / distance and focal length are all millimeters (mm).

[0103]

[0104] Table 7

[0105] In this example, by changing the spacing distance T1 between the first lens and the second lens on the optical axis (i.e., the spacing distance between the image side surface of the first lens E1 and the object side surface of the second lens E2 on the optical axis), the spacing distance T2 between the second lens and the third lens on the optical axis (i.e., the spacing distance between the image side surface of the second lens E2 and the object side surface of the third lens E3 on the optical axis), the spacing distance T3 between the third lens and the fourth lens on the optical axis (i.e., the spacing distance between the image side surface of the third lens E3 and the object side surface of the fourth lens E4 on the optical axis), and the spacing distance T4 between the fourth lens and the fifth lens on the optical axis (i.e., the spacing distance between the image side surface of the fourth lens E4 and the object side surface of the fifth lens E4 on the optical axis). The zoom lens is switched from the initial state to the final state or from the final state to the initial state by using the distance T5 between the fifth lens and the sixth lens on the optical axis (i.e., the distance between the image side surface of the fifth lens E5 and the object side surface of the sixth lens E6 on the optical axis), the distance T6 between the sixth lens and the seventh lens on the optical axis (i.e., the distance between the image side surface of the sixth lens E6 and the object side surface of the seventh lens E7 on the optical axis), and the distance T7 between the seventh lens and the filter on the optical axis (i.e., the distance between the image side surface of the seventh lens E7 and the object side surface of the filter E8 on the optical axis).

[0106] Table 8 shows specific parameter values ​​of the spacing distances T1-T7 between any two adjacent lenses from the first lens to the filter on the optical axis when the zoom lens of Example 3 is in the initial state and the final state, wherein the units of T1, T2, T3, T4, T5, T6 and T7 are all millimeters (mm).

[0107] T1 T2 T3 T4 T5 T6 T7 Initial state 0.5681 0.4677 0.1137 0.2115 2.5214 0.1000 0.4904 Final State 0.1000 0.9547 0.1822 0.3926 0.4067 2.7996 2.4876

[0108] Table 8

[0109] Table 9 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 3, wherein each aspherical surface shape can be defined by the formula (1) given in the above Example 1.

[0110] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -1.1428E-01 -3.4640E-02 -1.2073E-02 -4.9999E-03 -1.6077E-03 -5.0899E-04 -2.3280E-04 -9.3149E-05 -1.0777E-04 S2 8.6778E-02 -1.4006E-02 -6.7045E-03 9.5171E-05 -1.1996E-04 1.4938E-04 1.6936E-04 5.9211E-05 1.1719E-04 S3 2.5487E-02 1.6319E-02 -7.1088E-03 3.4712E-03 -1.7556E-03 2.7846E-04 -1.1719E-04 3.8073E-05 4.9037E-05 S4 6.6378E-03 1.3737E-02 -4.2930E-03 2.9006E-03 -1.2139E-03 2.0642E-05 -1.3340E-04 5.9566E-06 3.7392E-05 S5 7.2978E-02 3.9812E-03 -7.4228E-04 1.0286E-03 -3.7362E-05 2.0588E-04 -7.3562E-05 1.9778E-05 8.4549E-06 S6 2.7833E-03 -1.5209E-03 -6.0779E-04 -3.8353E-04 -1.6623E-05 2.3099E-04 0.0000E+00 0.0000E+00 0.0000E+00 S7 -8.8547E-03 -8.3370E-04 -9.9469E-04 7.1370E-04 -3.4858E-04 4.0327E-04 -8.1641E-05 0.0000E+00 0.0000E+00 S8 3.1061E-04 -6.2723E-03 -3.3733E-03 1.8913E-03 -9.8923E-04 2.7475E-04 -1.4168E-04 0.0000E+00 0.0000E+00 S9 -9.8647E-02 -1.1313E-02 -4.0113E-03 4.4264E-04 -5.5023E-04 -8.3262E-07 0.0000E+00 0.0000E+00 0.0000E+00 S10 -8.0777E-03 3.8729E-03 7.7084E-04 1.2811E-04 1.3178E-04 -1.5708E-05 0.0000E+00 0.0000E+00 0.0000E+00 S11 -2.1804E-01 1.1774E-01 2.6779E-02 -1.4647E-02 4.6411E-03 -3.5835E-03 1.5684E-03 -2.9858E-04 7.4289E-06 S12 -1.2807E-01 -4.4552E-02 1.4192E-02 -3.0468E-03 3.1009E-04 4.0434E-05 -1.9363E-05 2.5283E-06 -1.1326E-07 S13 -5.9922E-02 -2.5627E-02 -3.5859E-03 4.3160E-03 -1.3581E-03 2.7096E-04 -3.5287E-05 2.5917E-06 -7.9211E-08 S14 -3.0502E-01 1.3111E-02 -1.4713E-02 5.8729E-03 -1.0607E-03 5.5696E-05 2.0309E-05 -4.2821E-06 2.4655E-07

[0111] Table 9

[0112] Fig.11A and Fig. 12A The axial chromatic aberration curves of the zoom lens of Example 3 in the initial state and the final state are respectively shown, which indicate that light rays of different wavelengths deviate from the focal point behind the lens. Fig. 11B and Fig. 12BAstigmatism curves are shown when the zoom lens of Example 3 is in an initial state and a final state, respectively, which represent the meridional image curvature and the sagittal image curvature. Fig. 11C and Fig. 12C The distortion curves of the zoom lens of Example 3 when in the initial state and the final state are shown respectively, which represent the distortion magnitude values ​​corresponding to different image heights. FIG. 11A to FIG. 12C It can be seen that the zoom lens provided in Example 3 can achieve good imaging quality in all states.

[0113] Example 4

[0114] The following reference Figures 13 to 16C A zoom lens according to Embodiment 4 of the present application is described. Fig.13 A schematic structural diagram of a zoom lens in an initial state according to Embodiment 4 of the present application is shown. Fig.14 A schematic structural diagram of a zoom lens in a final state according to Embodiment 4 of the present application is shown.

[0115] like Fig.13 and Fig.14 As shown, the zoom lens includes, from the object side to the image side, a first lens E1, a second lens E2, a third lens E3, an aperture STO, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, a filter E8 and an imaging surface S17.

[0116] The first lens E1 has positive power, and its object side surface S1 is convex, and its image side surface S2 is convex. The second lens E2 has negative power, and its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has negative 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 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 negative power, and its object side surface S11 is concave, and its image side surface S12 is concave. 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 S1 to S16 in sequence and is finally imaged on the imaging surface S17.

[0117] In this example, the total effective focal length fs of the zoom lens in the initial state is 13.51 mm, the total effective focal length ft of the zoom lens in the final state is 18.39 mm, the maximum field of view FOVs of the zoom lens in the initial state is 34.2°, and the maximum field of view FOVt of the zoom lens in the final state is 24.8°. The zoom lens can achieve continuous zooming within the focal length range of 13.51 mm-18.39 mm.

[0118] Table 10 shows the basic parameter table of the zoom lens of Example 4, wherein the units of the curvature radius, thickness / distance and focal length are all millimeters (mm).

[0119]

[0120] Table 10

[0121] In this example, by changing the spacing distance T1 between the first lens and the second lens on the optical axis (i.e., the spacing distance between the image side surface of the first lens E1 and the object side surface of the second lens E2 on the optical axis), the spacing distance T2 between the second lens and the third lens on the optical axis (i.e., the spacing distance between the image side surface of the second lens E2 and the object side surface of the third lens E3 on the optical axis), the spacing distance T3 between the third lens and the fourth lens on the optical axis (i.e., the spacing distance between the image side surface of the third lens E3 and the object side surface of the fourth lens E4 on the optical axis), and the spacing distance T4 between the fourth lens and the fifth lens on the optical axis (i.e., the spacing distance between the image side surface of the fourth lens E4 and the object side surface of the fifth lens E4 on the optical axis). The zoom lens is switched from the initial state to the final state or from the final state to the initial state by using the distance T5 between the fifth lens and the sixth lens on the optical axis (i.e., the distance between the image side surface of the fifth lens E5 and the object side surface of the sixth lens E6 on the optical axis), the distance T6 between the sixth lens and the seventh lens on the optical axis (i.e., the distance between the image side surface of the sixth lens E6 and the object side surface of the seventh lens E7 on the optical axis), and the distance T7 between the seventh lens and the filter on the optical axis (i.e., the distance between the image side surface of the seventh lens E7 and the object side surface of the filter E8 on the optical axis).

[0122] Table 11 shows specific parameter values ​​of the spacing distances T1-T7 between any two adjacent lenses from the first lens to the filter on the optical axis when the zoom lens of Example 4 is in the initial state and the final state, wherein the units of T1, T2, T3, T4, T5, T6 and T7 are all millimeters (mm).

[0123] T1 T2 T3 T4 T5 T6 T7 Initial state 0.5564 0.4555 0.1241 0.2011 2.5008 0.1000 0.4748 Final State 0.1000 0.9433 0.1818 0.4202 0.4011 2.5829 2.5881

[0124] Table 11

[0125] Table 12 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 4, wherein each aspherical surface shape can be defined by the formula (1) given in the above Example 1.

[0126] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -1.1466E-01 -3.4820E-02 -1.1990E-02 -5.0518E-03 -1.6111E-03 -5.3516E-04 -2.3618E-04 -1.0635E-04 -9.3252E-05 S2 8.6875E-02 -1.3903E-02 -6.6046E-03 7.0632E-05 -1.1871E-04 1.0773E-04 1.7171E-04 5.2373E-05 1.0837E-04 S3 2.5611E-02 1.6575E-02 -6.7858E-03 3.5953E-03 -1.6106E-03 2.8045E-04 -7.6950E-05 3.4007E-05 4.3609E-05 S4 6.8056E-03 1.4444E-02 -3.9053E-03 3.1330E-03 -1.0760E-03 6.2750E-05 -1.0515E-04 4.1473E-06 2.3864E-05 S5 7.3452E-02 3.8931E-03 -4.0072E-04 1.2447E-03 -1.1992E-04 1.8777E-04 -1.1511E-04 -2.7150E-05 -2.6970E-05 S6 2.8414E-03 -1.6984E-03 -7.4630E-04 -2.2629E-04 -8.6090E-05 2.2715E-04 0.0000E+00 0.0000E+00 0.0000E+00 S7 -8.9890E-03 -4.7603E-04 -1.7037E-03 4.6885E-04 -1.5824E-04 3.1681E-04 -1.0417E-04 0.0000E+00 0.0000E+00 S8 1.1420E-03 -6.8958E-03 -3.6599E-03 1.2135E-03 -5.4180E-04 1.6836E-04 -1.1500E-04 0.0000E+00 0.0000E+00 S9 -9.8780E-02 -1.2677E-02 -3.6113E-03 1.6325E-04 -3.2743E-04 1.3436E-06 0.0000E+00 0.0000E+00 0.0000E+00 S10 -7.9135E-03 2.4180E-03 1.2272E-03 3.7502E-05 1.7844E-04 -2.2222E-05 0.0000E+00 0.0000E+00 0.0000E+00 S11 -2.1804E-01 1.1774E-01 2.6779E-02 -1.4647E-02 4.6411E-03 -3.5835E-03 1.5684E-03 -2.9858E-04 7.4289E-06 S12 -1.2807E-01 -4.4552E-02 1.4192E-02 -3.0468E-03 3.1009E-04 4.0434E-05 -1.9363E-05 2.5283E-06 -1.1326E-07 S13 -5.9922E-02 -2.5627E-02 -3.5859E-03 4.3160E-03 -1.3581E-03 2.7096E-04 -3.5287E-05 2.5917E-06 -7.9211E-08 S14 -3.0502E-01 1.3111E-02 -1.4713E-02 5.8729E-03 -1.0607E-03 5.5696E-05 2.0309E-05 -4.2821E-06 2.4655E-07

[0127] Table 12

[0128] Fig.15A and Fig.16AThe axial chromatic aberration curves of the zoom lens of Example 4 in the initial state and the final state are respectively shown, which indicate that light rays of different wavelengths deviate from the focal point behind the lens. Fig. 15B and Fig. 16B Astigmatism curves are shown when the zoom lens of Example 4 is in an initial state and a final state, respectively, which represent the meridional image plane curvature and the sagittal image plane curvature. Fig. 15C and Fig. 16C The distortion curves of the zoom lens of Example 4 in the initial state and the final state are shown respectively, which represent the distortion magnitude values ​​corresponding to different image heights. FIG. 15A to FIG. 16C It can be seen that the zoom lens provided in Example 4 can achieve good imaging quality in all states.

[0129] In summary, Examples 1 to 4 respectively satisfy the relationships shown in Table 13.

[0130] Conditional / Example 1 2 3 4 ft / fs 1.40 1.37 1.36 1.36 |△f| / |△TTL| 1.84 1.72 1.70 1.74 F1 / |△f| 1.28 1.36 1.39 1.37 F1 / F2 -1.59 -1.47 -1.44 -1.45 |△f| / CT1 2.52 2.38 2.36 2.40 (f2-f3) / (f4-f5) -0.72 -0.86 -0.95 -0.98 ft / (f6-f7) 0.60 0.32 0.28 0.34 R7 / R8 -1.24 -1.54 -1.90 -2.17 ∑CT / (CT5+CT6) 2.69 2.52 2.30 2.18 (T56+T67) / ∑AT(initial state) 0.62 0.62 0.61 0.61 (T56+T67) / ∑AT(final state) 0.63 0.62 0.62 0.60 (T12s+T23s) / (T12t+T23t) 1.01 0.99 0.98 0.97

[0131] Table 13

[0132] The present application also provides an imaging device, whose electronic photosensitive element can be a photosensitive coupled device (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated in a mobile electronic device such as a mobile phone. The imaging device is equipped with the zoom lens described above.

[0133] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A zoom lens, characterized in that: Along the optical axis from the object side to the image side, they include: a first lens group with positive refractive power, comprising a first lens with positive refractive power arranged along the optical axis; the object-side surface of the first lens is a convex surface, and the image-side surface is a convex surface; and The second lens group having negative optical power comprises, in order along the optical axis: The second lens has a negative optical power, and its object side surface is convex and its image side surface is concave; The third lens has a negative optical power, and its object side surface is convex and its image side surface is concave; a fourth lens element having negative optical power, whose object-side surface is concave and whose image-side surface is concave; a fifth lens having positive refractive power, whose object-side surface is convex and whose image-side surface is convex; a sixth lens having negative optical power, whose object-side surface is concave and whose image-side surface is concave; The seventh lens element has a negative optical power, and its object side surface is convex and its image side surface is concave; Wherein, the number of lenses having optical power of the zoom lens is seven; Changing the positions of the first lens to the seventh lens on the optical axis to achieve continuous zooming of the zoom lens; The total effective focal length ft when the zoom lens is in the final state and the total effective focal length fs when the zoom lens is in the initial state satisfy the following: 1.36≤ft / fs≤1.

40.

2. The zoom lens according to claim 1, wherein: The difference △f between the total effective focal length when the zoom lens is in the initial state and the total effective focal length when the zoom lens is in the final state and the difference △TTL between the distance from the object side surface of the first lens to the imaging surface of the zoom lens on the optical axis when the zoom lens is in the initial state and the distance from the object side surface of the first lens to the imaging surface of the zoom lens on the optical axis when the zoom lens is in the final state satisfy: 1.70≤|△f| / |△TTL|≤1.

84.

3. The zoom lens according to claim 1, wherein: A difference Δf between an effective focal length F1 of the first lens group and a total effective focal length when the zoom lens is in an initial state and a total effective focal length when the zoom lens is in a final state satisfies: 1.28≤F1 / |Δf|≤1.

39.

4. The zoom lens according to claim 1, wherein: The effective focal length F1 of the first lens group and the effective focal length F2 of the second lens group satisfy: -1.6<F1 / F2<-1.

4.

5. The zoom lens according to claim 1, wherein: A difference Δf between a total effective focal length of the zoom lens in an initial state and a total effective focal length of the zoom lens in a final state and a center thickness CT1 of the first lens on the optical axis satisfy: 2.36≤|Δf| / CT1≤2.

52.

6. The zoom lens according to claim 1, wherein: The effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens satisfy: -1.0<(f2-f3) / (f4-f5)<-0.

7.

7. The zoom lens according to claim 1, wherein: The total effective focal length ft of the zoom lens in the final state, the effective focal length f6 of the sixth lens, and the effective focal length f7 of the seventh lens satisfy: 0.28≤ft / (f6-f7)≤0.

60.

8. The zoom lens according to claim 1, wherein: The zoom lens further includes an aperture stop disposed between the third lens and the fourth lens. When the zoom lens is in the process of achieving zooming, the aperture is movable along the optical axis.

9. The zoom lens according to claim 1, wherein: A curvature radius R7 of the object-side surface of the fourth lens and a curvature radius R8 of the image-side surface of the fourth lens satisfy: -2.2<R7 / R8<-1.

2.

10. The zoom lens according to claim 1, wherein: The sum ΣCT of the center thicknesses of the first to seventh lenses on the optical axis, the center thickness CT5 of the fifth lens on the optical axis, and the center thickness CT6 of the sixth lens on the optical axis satisfy: 2.18≤ΣCT / (CT5+CT6)≤2.

69.

11. The zoom lens according to claim 1, wherein: A distance T56 between the fifth lens and the sixth lens on the optical axis, a distance T67 between the sixth lens and the seventh lens on the optical axis, and a sum ∑AT of distances between any two adjacent lenses from the first lens to the seventh lens on the optical axis satisfy: 0.60≤(T56+T67) / ∑AT≤0.

63.

12. The zoom lens according to claim 1, wherein: The spacing distance T12s between the first lens and the second lens on the optical axis when the zoom lens is in an initial state, the spacing distance T23s between the second lens and the third lens on the optical axis when the zoom lens is in an initial state, the spacing distance T12t between the first lens and the second lens on the optical axis when the zoom lens is in a final state, and the spacing distance T23t between the second lens and the third lens on the optical axis when the zoom lens is in a final state satisfy: 0.97≤(T12s+T23s) / (T12t+T23t)≤1.01.

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