Zoom lens

Abstract

The application provides a zoom lens, comprising, in order from the object side to the image side along the optical axis: a reflecting mirror, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens, wherein the first lens constitutes a first lens group, the first lens group has positive refractive power, the second lens to the fourth lens constitute a second lens group, the second lens group has positive refractive power, the fifth lens to the seventh lens constitute a third lens group, the third lens group has negative refractive power, the second lens group and the third lens group are movable along the optical axis to realize multiple zooming, there is an air gap between two adjacent lenses, and the zoom lens further satisfies: 1.40<(R2+R3) / (R2‑R3)<3.00 and‑1.35<(△T1+△T2) / △f<‑1.05.

Description

Technical Field

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

[0002] In recent years, with the trend of making mobile phones thinner and lighter, and with the continuous improvement of the demand for smartphone photography, the optical design of mobile phone lenses is facing greater challenges.

[0003] First, existing continuous zoom lenses typically rely on the mechanical movement of multiple lens groups. However, due to the limited internal space of mobile phone bodies, this approach is difficult to apply directly. Therefore, some research attempts to introduce mirrors to compress the optical path length, thereby achieving a longer equivalent focal length within the limited space of the phone body. Second, traditional mobile phone lenses mostly employ fixed focal lengths or stepped zoom designs, which struggle to meet users' demands for smooth zoom and high image quality. Furthermore, existing zoom lenses typically assume linear lens group movement when calculating aberrations. However, in actual assembly, the relative movement between lens elements can lead to non-ideal aberration variations, affecting image quality. Summary of the Invention

[0004] One advantage of this application is that it provides a zoom lens that combines a mirror and continuous zoom technology, which can achieve smooth, high-precision zoom capabilities and optimize optical performance while maintaining a compact lens structure.

[0005] This application provides a zoom lens, comprising, in sequence along the optical axis from the object side to the image side: a mirror, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens; Wherein, the first lens constitutes a first lens group, the first lens group has positive optical power, the second lens, the third lens and the fourth lens constitute a second lens group, the second lens group has positive optical power, the fifth lens, the sixth lens and the seventh lens constitute a third lens group, the third lens has negative optical power, and the second lens group and the third lens group are movable along the optical axis to achieve zoom. In the zoom lens, there is an air gap between two adjacent lenses; The zoom lens also satisfies: 1.40 < (R² + R³) / (R² - R³) < 3.00; and -1.35 < (△T1 + △T2) / △f < -1.05; Wherein, R2 is the radius of curvature of the image side of the first lens; R3 is the radius of curvature of the object side of the second lens; △T1 is the change in air gap between the first lens group and the second lens group when the zoom lens zooms from the wide-angle end to the telephoto end; △T2 is the change in air gap between the second lens group and the third lens group when the zoom lens zooms from the wide-angle end to the telephoto end; △f is the difference in effective focal length of the optical system at the wide-angle end and the telephoto end of the zoom lens, respectively.

[0006] In some embodiments of this application, the zoom lens also satisfies: 2.20 <R2 / △T1<5.05; Wherein, R2 is the radius of curvature of the image side of the first lens, and △T1 is the change in the air gap between the first lens group and the second lens group when the zoom lens zooms from the wide-angle end to the telephoto end.

[0007] In some embodiments of this application, the zoom lens also satisfies: -1.55 <R8 / △T2<-1.25; Wherein, R8 is the radius of curvature of the image side of the fourth lens, and △T2 is the change in air gap between the second lens group and the third lens group when the zoom lens zooms from the wide-angle end to the telephoto end.

[0008] In some embodiments of this application, the zoom lens further includes a filter disposed on the image side of the seventh lens, and the zoom lens further satisfies: -0.65 <R14 / △T3<-0.35; Wherein, R14 is the radius of curvature of the image side of the seventh lens, and △T3 is the change in the air gap between the third lens group and the filter when the zoom lens zooms from the wide-angle end to the telephoto end.

[0009] In some embodiments of this application, the zoom lens also satisfies: 2.15 < (V1 / V2) × (fW / fL) < 2.30; Wherein, V1 is the Abbe number of the first lens, V2 is the Abbe number of the second lens, fW is the effective focal length of the optical system when the zoom lens is at the wide-angle end, and fL is the effective focal length of the optical system when the zoom lens is at the telephoto end.

[0010] In some embodiments of this application, the zoom lens also satisfies: 0.55 <DT12 / EPD<0.85; Wherein, DT12 is the maximum effective radius of the image side of the first lens, and EPD is the entrance pupil diameter of the zoom lens.

[0011] In some embodiments of this application, the zoom lens also satisfies: 0.75 <f7 / △T3<1.05; Where f7 is the effective focal length of the seventh lens, and △T3 is the change in the air gap between the third lens group and the filter when the zoom lens zooms from the wide-angle end to the telephoto end.

[0012] In some embodiments of this application, the zoom lens also satisfies: 95.80 <f6 / T67×(V6 / N6)<155.65; Where f6 is the effective focal length of the sixth lens, T67 is the air gap between the sixth lens and the seventh lens on the optical axis, V6 is the Abbe number of the sixth lens, and N6 is the refractive index of the sixth lens.

[0013] In some embodiments of this application, the zoom lens also satisfies: 2.15 <F2 / T2W<2.45; Wherein, F2 is the effective focal length of the second lens group, and T2W is the air gap on the optical axis between the second lens group and the third lens group when the zoom lens is located at the wide-angle end.

[0014] In some embodiments of this application, the zoom lens also satisfies: 3.10<(SAG11+SAG12) / (SAG11-SAG12)<5.65; Wherein, SAG11 is the axial distance between the intersection of the object side of the first lens and the optical axis and the vertex of the effective radius of the object side of the first lens, and SAG12 is the axial distance between the intersection of the image side of the first lens and the optical axis and the vertex of the effective radius of the image side of the first lens.

[0015] In some embodiments of this application, the zoom lens also satisfies: 7.25mm <TTL×△tan(FOV)<11.55mm; Wherein, TTL is the on-axis distance from the object side of the first lens to the imaging plane of the zoom lens, and Δtan(FOV) is the difference in the tangent function value of the maximum field of view of the zoom lens when the zoom lens zooms from the wide-angle end to the telephoto end.

[0016] In some embodiments of this application, the zoom lens also satisfies: 1.35 <T1W / T2W<3.25; Wherein, T1W is the distance on the optical axis between the first lens group and the second lens group when the zoom lens is located at the wide-angle end, and T2W is the distance on the optical axis between the second lens group and the third lens group when the zoom lens is located at the wide-angle end.

[0017] In some embodiments of this application, the zoom lens also satisfies: -2.60 < (R13 + R14) / F3 < 0.65; Wherein, R13 is the radius of curvature of the object side of the seventh lens, R14 is the radius of curvature of the image side of the seventh lens, and F3 is the effective focal length of the third lens group.

[0018] In some embodiments of this application, the zoom lens also satisfies: 4.30 <CT4 / T34<9.35; Wherein, CT4 is the center thickness of the fourth lens on the optical axis, and T34 is the air gap between the third lens and the fourth lens on the optical axis.

[0019] In some embodiments of this application, the zoom lens also satisfies: -1.40 <f7 / f6<-0.65; Wherein, f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens.

[0020] In summary, this application arranges a reflecting mirror and three lens groups sequentially along the optical axis, with the first lens group as the fixed group and the second and third lens groups as the movable groups. The curvature configuration and zoom motion control of the optical system in the zoom lens are constrained by the conditions 1.40 < (R2 + R3) / (R2 - R3) < 3.00 and -1.35 < (ΔT1 + ΔT2) / Δf < -1.05, respectively. This reasonably controls the curvature radius of the image-side surface of the first lens and the curvature radius of the object-side surface of the second lens to satisfy the constraints of the aforementioned conditions. Meanwhile, by constraining the change in air gap distance and the difference in system focal length, it effectively avoids problems such as difficulty in correcting higher-order aberrations (e.g., spherical aberration, coma) due to excessive curvature differences, or redundancy in optical power due to excessively small curvature radii. It also constrains the cooperative motion logic between multiple lens groups during zooming, optimizes the smoothness of the zoom trajectory, avoids mechanical interference, and improves image quality consistency at zoom ratios (multiple magnifications). Through effective control of the volume, image quality, and zoom smoothness of the optical system in the zoom lens, the structure of the zoom lens is made compact, while achieving high-magnification zoom quality. Attached Figure Description

[0021] Figure 1A This is a schematic diagram of the zoom lens at the telephoto end in Embodiment 1 provided in this application; Figure 1BThis is a schematic diagram of the zoom lens at the wide-angle end in Embodiment 1 provided in this application; Figure 1C According to the on-axis chromatic aberration curve of the zoom lens at the telephoto end in Embodiment 1; Figure 1D According to the astigmatism curve of the zoom lens at the telephoto end in Example 1; Figure 1E According to the distortion curve of the zoom lens at the telephoto end in Example 1; Figure 1F According to the on-axis chromatic aberration curve of the zoom lens at the wide-angle end in Embodiment 1; Figure 1G According to the astigmatism curve of the zoom lens at the wide-angle end in Embodiment 1; Figure 1H According to the distortion curve of the zoom lens at the wide-angle end in Embodiment 1; Figure 2A This is a schematic diagram of the zoom lens at the telephoto end in Embodiment 2 provided in this application; Figure 2B This is a schematic diagram of the zoom lens at the wide-angle end in Embodiment 2 provided in this application; Figure 2C According to the on-axis chromatic aberration curve of the zoom lens at the telephoto end in Example 2; Figure 2D According to the astigmatism curve of the zoom lens at the telephoto end in Example 2; Figure 2E According to the distortion curve of the zoom lens at the telephoto end in Example 2; Figure 2F According to the on-axis chromatic aberration curve of the zoom lens at the wide-angle end in Example 2; Figure 2G According to the astigmatism curve of the zoom lens at the wide-angle end in Example 2; Figure 2H According to the distortion curve of the zoom lens at the wide-angle end in Example 2; Figure 3A This is a schematic diagram of the zoom lens at the telephoto end in Embodiment 3 provided in this application; Figure 3B This is a schematic diagram of the zoom lens at the wide-angle end in Embodiment 3 provided in this application; Figure 3C According to the on-axis chromatic aberration curve of the zoom lens at the telephoto end in Example 3; Figure 3D According to the astigmatism curve of the zoom lens at the telephoto end in Example 3; Figure 3EAccording to the distortion curve of the zoom lens at the telephoto end in Example 3; Figure 3F According to the on-axis chromatic aberration curve of the zoom lens at the wide-angle end in Embodiment 3; Figure 3G According to the astigmatism curve of the zoom lens at the wide-angle end in Example 3; Figure 3H The distortion curve of the zoom lens at the wide-angle end in Example 3. Detailed Implementation

[0022] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this 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.

[0023] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0024] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not strictly to scale.

[0025] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface shape in the paraxial region can be determined according to methods commonly used in the art, such as using the sign of the R value (R refers to the radius of curvature of the paraxial region) to determine concavity or convexity. In this paper, the surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens. For the object-side surface, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; for the image-side surface, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

[0026] It should also be understood that the terms "comprising," "including," "having," "containing," 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. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0027] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having a meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized sense, unless expressly so specified herein.

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. The following embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this application. It should be pointed out that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] According to one aspect of this application, such as Figure 1A , Figure 1B , Figure 2A , Figure 2B , Figure 3A , Figure 3B As shown, one embodiment of this application proposes a zoom lens, comprising, in sequence along the optical axis from the object side to the image side: a mirror, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. Wherein, the first lens E1 constitutes the first lens group G1, which has positive optical power; the second lens E2, the third lens E3, and the fourth lens E4 constitute the second lens group G2, which also has positive optical power; the fifth lens E5, the sixth lens E6, and the seventh lens E7 constitute the third lens group G3, which has negative optical power; and the second lens group G2 and the third lens group G3 are movable along the optical axis to achieve zoom. Among the multiple lenses in the zoom lens, there is an air gap between two adjacent lenses; The zoom lens further satisfies: 1.40 < (R2 + R3) / (R2 - R3) < 3.00; and -1.35 < (△T1 + △T2) / △f < -1.05; where, R2 is the radius of curvature of the image side of the first lens E1; R3 is the radius of curvature of the object side of the second lens E2; △T1 is the change distance of the air gap between the first lens group G1 and the second lens group G2 when the zoom lens zooms from the wide-angle end to the telephoto end; △T2 is the change distance of the air gap between the second lens group G2 and the third lens group G3 when the zoom lens zooms from the wide-angle end to the telephoto end; △f is the difference in the effective focal length of the optical system at the wide-angle end and the telephoto end of the zoom lens.

[0030] It should be noted that in this application, by arranging a reflector and three lens groups in sequence along the optical axis, taking the first lens group G1 as a fixed group, and the second lens group G2 and the third lens group G3 as movable groups, the curvature configuration of the optical system in the zoom lens and the zoom motion control are respectively constrained by the conditional expressions 1.40 < (R2 + R3) / (R2 - R3) < 3.00 and -1.35 < (△T1 + △T2) / △f < -1.05; reasonably control the range of the radius of curvature of the image side of the first lens E1 and the radius of curvature of the object side of the second lens E2 to meet the above conditional expressions. At the same time, constrain the difference between the change distance of the air gap and the system focal length, effectively avoiding the difficulty of correcting high-order aberrations (such as spherical aberration and coma) caused by excessive curvature differences or the problem of redundant optical power caused by too small radius of curvature. At the same time, it can constrain the cooperative motion logic between multiple lens groups during the zoom process, optimize the smoothness of the zoom trajectory, avoid mechanical interference, and improve the image quality consistency at high zoom ratios (multi-magnifications); through the volume, image quality and zoom smoothness of the optical system in the zoom lens, the structure of the zoom lens is made compact, and at the same time, high-magnification zoom quality is achieved.

[0031] Preferably, the zoom lens satisfies: 1.45 ≤ (R2 + R3) / (R2 - R3) ≤ 2.97; and -1.34 ≤ (△T1 + △T2) / △f ≤ -1.10.

[0032] According to some embodiments of the present application, the zoom lens satisfies: 2.20 < R2 / △T1 < 5.05, where, R2 is the radius of curvature of the image side of the first lens E1, and △T1 is the change distance of the air gap between the first lens group G1 and the second lens group G2 when the zoom lens zooms from the wide-angle end to the telephoto end.

[0033] In this way, the ratio of the radius of curvature of the image side of the first lens E1 to the change distance of the air gap between the first lens group G1 and the second lens group G2 is reasonably controlled, avoiding the processing difficulty problem caused by excessive inclination angle. At the same time, during the zooming process, the control of this ratio can reduce the influence of focal length change on image quality and ensure the imaging consistency at each focal length.

[0034] Preferably, the zoom lens satisfies: 2.23 ≤ R2 / ΔT1 ≤ 5.02.

[0035] According to some embodiments of the present application, the zoom lens satisfies: -1.55 < R8 / ΔT2 < -1.25, where R8 is the radius of curvature of the image side of the fourth lens E4, and ΔT2 is the change distance of the air gap between the second lens group G2 and the third lens group G3 when the zoom lens zooms from the wide-angle end to the telephoto end.

[0036] In this way, the radius of curvature of the image side of the fourth lens E4 and the change distance of the air gap between the second lens group G2 and the third lens group G3 are reasonably controlled within a reasonable range, so that the radius of curvature of the optical surface of the fourth lens E4 will not be too large, and the sagitta of this lens is controlled within a reasonable range, which can slow down the deflection of light in the fourth lens E4, effectively reducing the sensitivity of this lens. At the same time, the reasonable control of this ratio helps to achieve a smooth zooming process, reducing image plane jitter and focus shift.

[0037] Preferably, the zoom lens satisfies: -1.50 ≤ R8 / ΔT2 ≤ -1.27.

[0038] According to some embodiments of the present application, the zoom lens satisfies: -0.65 < R14 / ΔT3 < -0.35, where R14 is the radius of curvature of the image side of the seventh lens E7, and ΔT3 is the change distance of the air gap between the third lens group G3 and the filter when the zoom lens zooms from the wide-angle end to the telephoto end.

[0039] In this way, the ratio of the radius of curvature of the seventh lens E7 to the change distance of the air gap between the third lens group G3 and the filter is reasonably controlled, and the sagitta of this lens is controlled within a reasonable range. On the one hand, it can better balance the field curvature and distortion of the entire system. On the other hand, the optical power of the compensation group can be reasonably distributed, reducing the stroke of the compensation group, shortening the length of the entire zoom lens, optimizing the position of the filter, and weakening the influence of stray light generated by the filter or dust spots on the filter on the actual imaging.

[0040] Preferably, the zoom lens satisfies: -0.62 ≤ R14 / ΔT3 ≤ -0.36.

[0041] According to some embodiments of the present application, the zoom lens satisfies: 2.15 < (V1 / V2)×(fW / fL) < 2.30, where V1 is the Abbe number of the first lens E1, V2 is the Abbe number of the second lens E2, fW is the effective focal length of the optical system of the zoom lens at the wide-angle end, and fL is the effective focal length of the optical system of the zoom lens at the telephoto end.

[0042] In this way, by reasonably controlling the ratio of the Abbe numbers of the first two lenses and the effective focal lengths of the optical system of the zoom lens at the wide-angle end and the telephoto end respectively, it is ensured that the material combination of the first lens E1 and the second lens E2 can effectively correct chromatic aberration (especially axial chromatic aberration and lateral chromatic aberration), and at the same time, the chromatic aberration correction is combined with the zoom range to ensure that the chromatic aberration is evenly corrected throughout the zoom range, thereby improving the consistency of the imaging quality and avoiding obvious chromatic aberration jumps.

[0043] Preferably, the zoom lens satisfies: 2.16 ≤ (V1 / V2)×(fW / fL) ≤ 2.25.

[0044] According to some embodiments of the present application, the zoom lens satisfies: 0.55 < DT12 / EPD < 0.85, where DT12 is the maximum effective radius of the image side of the first lens E1, and EPD is the entrance pupil diameter of the optical imaging system of the zoom lens.

[0045] In this way, the maximum effective radius DT12 of the image side of the first lens E1 determines the propagation path of the light beam after passing through the first lens E1. By restricting the ratio of DT12 / EPD, the incident angle of the light beam can be controlled, which helps to optimize the correction of aberrations such as spherical aberration, coma, and astigmatism, especially in the marginal fields at the wide-angle end and the telephoto end. At the same time, it can ensure that the maximum effective radius of the image side of the first lens E1 matches the entrance pupil diameter, avoiding light flux loss or over-concentration, thereby improving the imaging brightness and uniformity.

[0046] Preferably, the zoom lens satisfies: 0.57 ≤ DT12 / EPD ≤ 0.80.

[0047] According to some embodiments of the present application, the zoom lens satisfies: 0.75 < f7 / △T3 < 1.05, where f7 is the effective focal length of the seventh lens E7, and △T3 is the change distance of the air gap between the third lens group G3 and the filter when the zoom lens zooms from the wide-angle end to the telephoto end.

[0048] In this way, the seventh lens E7 is located at the rear of the optical system, close to the image plane. Its effective focal length has an important influence on the correction of aberrations such as field curvature, distortion, and astigmatism. By restricting the ratio of this formula, the correction effect of the seventh lens E7 on aberrations can be optimized, reducing the shift of the image plane during the zoom process, ensuring the stability of the image plane, and avoiding imaging blurring.

[0049] Preferably, the zoom lens satisfies: 0.76 ≤ f7 / ΔT3 ≤ 1.04.

[0050] According to some embodiments of the present application, the zoom lens satisfies: 95.80 < f6 / T67×(V6 / N6) < 155.65, where f6 is the effective focal length of the sixth lens, T67 is the air gap on the optical axis between the sixth lens E6 and the seventh lens E7, V6 is the Abbe number of the sixth lens E6, and N6 is the refractive index of the sixth lens E6.

[0051] In this way, the ratio of the Abbe number (V6) to the refractive index (N6) reflects the dispersion characteristics of the material; f6 / T67 reflects the proportional relationship between the focal length of the sixth lens E6 and the air gap between it and the seventh lens E7. For the value of the above conditional expression, if it is too small, the system is too compact, affecting aberration correction; if it is too large, the system volume is too large, which is not conducive to miniaturization design. By constraining the proportional relationship between the focal length of the sixth lens E6, the material properties (Abbe number and refractive index), and the lens spacing, it is ensured that the continuous zoom lens has good chromatic aberration correction ability during the zoom process.

[0052] Preferably, the zoom lens satisfies: 95.83 ≤ f6 / T67×(V6 / N6) ≤ 155.63.

[0053] According to some embodiments of the present application, the zoom lens satisfies: 2.15 < F2 / T2W < 2.45, where F2 is the effective focal length of the second lens group G2, and T2W is the distance on the optical axis between the second lens group G2 and the third lens group G3 at the wide-angle end. [[ID=)15]]

[0054] In this way, this formula reflects the proportional relationship between the focal length of the second lens group G2 and the distance between the second lens group G2 and the third lens group G3. The wide-angle end is a key working state in the design of a continuous zoom lens, and usually has high requirements for aberration correction and optical performance. By constraining this formula, it can be ensured that at the wide-angle end, the distance between the second lens group G2 and the third lens group G3 matches the focal length of the second lens group G2, thereby optimizing the imaging quality. At the same time, in a continuous zoom optical architecture, the second lens group G2 performs the zoom function, and the third lens group G3 performs the compensation function. This formula can ensure the coordinated operation between the second lens group G2 and the third lens group G3 to meet the dynamic requirements of the zoom lens.

[0055] Preferably, the zoom lens satisfies: 2.17 ≤ F2 / T2W ≤ 2.40.

[0056] According to some embodiments of the present application, the zoom lens satisfies: 3.10 < (SAG11 + SAG12) / (SAG11 - SAG12) < 5.65, where SAG11 is the axial distance between the intersection point of the object side surface of the first lens E1 and the optical axis and the vertex of the effective radius of the object side surface of the first lens E1, and SAG12 is the axial distance between the intersection point of the image side surface of the first lens E1 and the optical axis and the vertex of the effective radius of the image side surface of the first lens E1.

[0057] In this way, this formula essentially describes the shape characteristics of the first lens E1. By constraining the range of this formula, the curvature distribution of the first lens E1 can be controlled, so as to optimize the correction effect of the first lens E1 on aberrations such as spherical aberration, coma, and astigmatism. Especially during the zooming process, a reasonable shape factor helps to balance the aberration correction ability of the optical system.

[0058] Preferably, the zoom lens satisfies: 3.11 ≤ (SAG11 + SAG12) / (SAG11 - SAG12) ≤ 5.64.

[0059] According to some embodiments of the present application, the zoom lens satisfies: 7.25 mm < TTL × △tan(FOV) < 11.55 mm, where TTL is the axial distance from the object side surface of the first lens E1 to the imaging surface, and △tan(FOV) is the change difference of the tangent function of the maximum field angle of the zoom lens when zooming from the minimum focal length end to the maximum focal length end.

[0060] In this way, TTL is the total length of the optical system, which directly affects the volume and compactness of the lens. △tan(FOV) reflects the change range of the field angle during the zooming process and is an important indicator of the performance of the zoom lens. Constraining the range of this formula helps to balance the zoom range, imaging quality, and compactness of the system.

[0061] Preferably, the zoom lens satisfies: 7.28 mm ≤ TTL × △tan(FOV) ≤ 11.51 mm.

[0062] According to some embodiments of the present application, the zoom lens satisfies: 1.35 < T1W / T2W < 3.25, where T1W is the distance between the first lens group G1 and the second lens group G2 on the optical axis when the zoom lens is at the wide-angle end, and T2W is the distance between the second lens group G2 and the third lens group G3 on the optical axis when the zoom lens is at the wide-angle end.

[0063] In this way, by reasonably controlling the range of this ratio, in addition to making the structure of the lens more compact and reasonable, facilitating installation and use, it can also enable the zoom lens to achieve good zoom effects at the wide-angle end. Different ratios will affect the refraction and propagation path of light, and further determine the continuous zoom ability of the zoom lens from the wide-angle end to the telephoto end, ensuring clear and stable imaging throughout the zoom range. If the ratio exceeds this range, problems such as image quality degradation and discontinuous focal length change may occur during the zoom process.

[0064] Preferably, the zoom lens satisfies: 1.40 ≤ T1W / T2W ≤ 3.22.

[0065] According to some embodiments of the present application, the zoom lens satisfies: -2.60 < (R13 + R14) / F3 < 0.65, where R13 is the curvature radius of the object side surface of the seventh lens E7, R14 is the curvature radius of the image side surface of the seventh lens E7, and F3 is the effective focal length of the third lens group G3.

[0066] In this way, the curvature radius of the seventh lens E7 directly affects the aberration distribution of the optical system, especially field curvature, distortion, and astigmatism. By constraining this ratio, the aberration correction effect of the seventh lens E7 can be optimized, especially at the edge fields of the wide-angle end and the telephoto end. At the same time, reasonably controlling this ratio can avoid the curvature radius of the seventh lens E7 being too large or too small, thereby simplifying the mechanical structure design, contributing to improving the stability and durability of the system, and reducing the manufacturing cost.

[0067] Preferably, the zoom lens satisfies: -2.56 ≤ (R13 + R14) / F3 ≤ 0.62.

[0068] According to some embodiments of the present application, the zoom lens satisfies: 4.30 < CT4 / T34 < 9.35, where CT4 is the central thickness of the fourth lens E4 on the optical axis, and T34 is the air gap between the third lens E3 and the fourth lens E4 on the optical axis.

[0069] In this way, the central thickness of the fourth lens E4 and the air gap between the third lens E3 and the fourth lens E4 jointly affect the aberration distribution of the optical system, especially spherical aberration, coma, and astigmatism. Reasonably controlling this ratio helps to balance the optical power, avoid a certain lens group G1承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦度承担过多光焦​​​​​According to some embodiments of the present application, the zoom lens satisfies: -1.40 < f7 / f6 < -0.65, where f6 is the effective focal length of the sixth lens E6 and f7 is the effective focal length of the seventh lens E7.

[0072] In this way, the sixth lens E6 and the seventh lens E7 are usually located at the rear of the optical system, close to the image plane. Their effective focal lengths have an important impact on the correction of aberrations (such as field curvature, distortion, and astigmatism). Controlling this ratio to be negative ensures that the optical power of the compensation group is negative. Adopting a negative optical power group design helps to further reduce the lens size, making it more suitable for mobile phone lens modules. At the same time, reasonably controlling the range of this ratio can also reduce the focusing travel and ensure that the motor travel is within a reasonable range.

[0073] Preferably, the zoom lens satisfies: -1.36 ≤ f7 / f6 ≤ -0.67.

[0074] It should be noted that those skilled in the art should understand that without departing from the technical solutions claimed in the present application, the number of spacer elements constituting the zoom lens can be changed to obtain the various results and advantages described in this specification. The present application does not make specific limitations in this regard. For example, according to needs, the zoom lens may also include other numbers of spacer elements different from those described in the above embodiments.

[0075] Some specific but non-limiting embodiments of the above embodiments of the present application will be described in more detail below with reference to the accompanying drawings. For the convenience of description, in the following embodiments, OBJ represents the object plane of the zoom lens, S1 represents the object side surface of the first lens E1, S2 represents the image side surface of the first lens E1, S3 represents the object side surface of the second lens E2, S4 represents the image side surface of the second lens E2, S5 represents the object side surface of the third lens E3, S6 represents the image side surface of the third lens E3, S7 represents the object side surface of the fourth lens E4, S8 represents the image side surface of the fourth lens E4, S9 represents the object side surface of the fifth lens E5, S10 represents the image side surface of the fifth lens E5, S11 represents the object side surface of the sixth lens E6; S12 represents the image side surface of the sixth lens E6, S13 represents the object side surface of the seventh lens E7, S14 represents the image side surface of the seventh lens E7, S15 represents the object side surface of a filter (not shown in the figure) located on the image side of the zoom lens, S16 represents the image side surface of this filter, and S17 represents the image plane of the zoom lens. In addition, Aj represents the jth-order aspherical coefficient, where j = 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30.

[0076] Embodiment 1 As Figure 1A and Figure 1BAs shown, in this embodiment, the zoom lens includes the following components arranged sequentially along the optical axis from the object side to the image side: a mirror, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. The first lens forms a first lens group G1, the second lens E2, the third lens E3, and the fourth lens E4 form a second lens group G2, and the fifth lens E5, the sixth lens E6, and the seventh lens E7 form a third lens group G3. The second lens group G2 and the third lens group G3 are movable along the optical axis to achieve zoom, and there is an air gap between adjacent lenses.

[0077] In this embodiment, the first lens group G1 has positive optical power, the second lens group G2 has positive optical power, and the third lens group G3 has negative optical power. The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, and its object-side surface S7 and image-side surface S8 are convex. The fifth lens E5 has negative optical power, and its object-side surface S9 is convex and its image-side surface S10 is concave. The sixth lens E6 has positive optical power, and its object-side surface S11 is convex and its image-side surface S12 is concave. The seventh lens E7 has negative optical power, and its object-side surface S13 is convex and its image-side surface S14 is concave.

[0078] In addition, Table 1 shows the basic optical parameters of the zoom lens of Embodiment 1, wherein the units of radius of curvature and thickness / spacing are millimeters (mm).

[0079] Table 1: Basic optical parameters of the zoom lens in Example 1

[0080] It should be noted that the materials in Table 1 include refractive index and Abbe number. For example, in Table 1, the materials 1.44 and 95.10 of S1 indicate that the refractive index of the first lens E1 is 1.44 and the Abbe number is 95.10, respectively.

[0081] In this embodiment, the object-side surface and image-side surface of any one of the first lens E1 to the seventh lens E7 are aspherical, and the surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula: ; Where x is the distance vector from the vertex of the aspherical surface at a height h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for the aspherical mirrors S1 to S14 in Example 1.

[0082] Table 2: Aspherical coefficient table of the zoom lens in Example 1

[0083]

[0084] Table 3 below shows the lens parameters of the zoom lens at the wide-angle and telephoto ends: f (effective focal length of the zoom lens), Semi-FOV (half of the maximum field of view), Fno (aperture), T1 (distance between the first lens group G1 and the second lens group G2), T2 (distance between the second lens group G2 and the third lens group G3), and T3 (distance between the third lens group G3 and the filter).

[0085] Table 3. Lens parameters of the zoom lens in Example 1 at the wide-angle and telephoto ends.

[0086] The results calculated based on the lens parameters of the zoom lens in the table above are as follows: Figures 1C to 1H As shown, where, Figures 1C to 1E These are the on-axis chromatic aberration curve, astigmatism curve, and distortion curve for a zoom lens at the telephoto end. Figures 1F to 1H The figures show the on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the zoom lens at the wide-angle end. The calculation results from the curves show that the zoom lens in Embodiment 1 provided in this application has good image quality at both the telephoto and wide-angle ends.

[0087] Example 2 like Figure 2A and Figure 2BAs shown, in this embodiment, the zoom lens includes the following components arranged sequentially along the optical axis from the object side to the image side: a mirror, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. The first lens forms a first lens group G1, the second lens E2, the third lens E3, and the fourth lens E4 form a second lens group G2, and the fifth lens E5, the sixth lens E6, and the seventh lens E7 form a third lens group G3. The second lens group G2 and the third lens group G3 are movable along the optical axis to achieve zoom, and there is an air gap between adjacent lenses.

[0088] In this embodiment, the first lens group G1 has positive optical power, the second lens group G2 has positive optical power, and the third lens group G3 has negative optical power. In this embodiment, the first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave; the second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave; and the third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. 6 is concave; the fourth lens E4 has positive optical power, the object side S7 of the fourth lens E4 is convex, and the image side S8 is convex; the fifth lens E5 has negative optical power, the object side S9 of the fifth lens E5 is convex, and the image side S10 is concave; the sixth lens E6 has positive optical power, the object side S11 of the sixth lens E6 is convex, and the image side S12 is concave; the seventh lens E7 has negative optical power, the object side S13 of the seventh lens E7 is convex, and the image side S14 is concave.

[0089] In addition, Table 4 shows the basic optical parameters of the zoom lens of Embodiment 2, where the units for radius of curvature and thickness / spacing are millimeters (mm).

[0090] Table 4: Basic optical parameters of the zoom lens in Example 2

[0091] It should be noted that the materials in Table 4 include refractive index and Abbe number. For example, in Table 4, the materials 1.44 and 95.10 for S1 indicate that the refractive index of the first lens E1 is 1.44 and the Abbe number is 95.10, respectively.

[0092] Table 5 below shows the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each aspherical mirror S3 to S14 in Example 2.

[0093] Table 5. Aspherical coefficient table of the zoom lens in Example 2

[0094]

[0095] Table 6 below shows the lens parameters of the zoom lens at the wide-angle and telephoto ends: f (effective focal length of the zoom lens), Semi-FOV (half of the maximum field of view), Fno (aperture), T1 (distance between the first lens group G1 and the second lens group G2), T2 (distance between the second lens group G2 and the third lens group G3), and T3 (distance between the third lens group G3 and the filter).

[0096] Table 6. Lens parameters of the zoom lens in Example 2 at the wide-angle and telephoto ends.

[0097] The results calculated based on the lens parameters of the zoom lens in the table above are as follows: Figures 2C to 2H As shown, where, Figures 2C to 2E These are the on-axis chromatic aberration curve, astigmatism curve, and distortion curve for a zoom lens at the telephoto end. Figures 2F to 2H The figures show the on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the zoom lens at the wide-angle end. The calculation results from the curves show that the zoom lens in Embodiment 2 provided in this application has good image quality at both the telephoto and wide-angle ends.

[0098] Example 3 like Figure 3A and Figure 3B As shown, in this embodiment, the zoom lens includes the following components arranged sequentially along the optical axis from the object side to the image side: a mirror, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7. The first lens forms a first lens group G1, the second lens E2, the third lens E3, and the fourth lens E4 form a second lens group G2, and the fifth lens E5, the sixth lens E6, and the seventh lens E7 form a third lens group G3. The second lens group G2 and the third lens group G3 are movable along the optical axis to achieve zoom, and there is an air gap between adjacent lenses.

[0099] In this embodiment, the first lens group G1 has positive optical power, the second lens group G2 has positive optical power, and the third lens group G3 has negative optical power. The first lens E1 has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has negative optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens E4 has positive optical power, and its object-side surface S7 and image-side surface S8 are convex. The fifth lens E5 has negative optical power, and its object-side surface S9 and image-side surface S10 are concave. The sixth lens E6 has positive optical power, and its object-side surface S11 and image-side surface S12 are convex. The seventh lens E7 has negative optical power, and its object-side surface S13 and image-side surface S14 are concave.

[0100] In addition, Table 7 shows the basic optical parameters of the zoom lens of Embodiment 3, where the radius of curvature and thickness / spacing are in millimeters (mm).

[0101] Table 7: Basic Optical Parameters of the Zoom Lens in Example 3

[0102] It should be noted that the materials in Table 7 include refractive index and Abbe number. For example, in Table 7, the materials 1.44 and 95.10 for S1 indicate that the refractive index of the first lens E1 is 1.44 and the Abbe number is 95.10, respectively.

[0103] Table 8 below shows the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each aspherical mirror S3 to S14 in Example 3.

[0104] Table 8 Aspherical coefficient table of the zoom lens in Example 3

[0105]

[0106] Table 9 below shows the lens parameters of the zoom lens in Example 3 at the wide-angle and telephoto ends: f (effective focal length of the zoom lens), Semi-FOV (half of the maximum field of view), Fno (aperture), T1 (distance between the first lens group G1 and the second lens group G2), T2 (distance between the second lens group G2 and the third lens group G3), and T3 (distance between the third lens group G3 and the filter).

[0107] Table 9. Lens parameters of the zoom lens in Example 3 at the wide-angle and telephoto ends.

[0108] The results calculated based on the lens parameters of the zoom lens in the table above are as follows: Figures 3C to 3H As shown, where, Figures 3C to 3E These are the on-axis chromatic aberration curve, astigmatism curve, and distortion curve for a zoom lens at the telephoto end. Figures 3F to 3H The figures show the on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the zoom lens at the wide-angle end. The calculation results from the curves show that the zoom lens in Embodiment 3 of this application has good image quality at both the telephoto and wide-angle ends.

[0109] In summary, in Embodiments 1 to 3, the effective focal lengths f1 to f7 of the first lens E1 to the seventh lens E7 in the zoom lens, the entrance pupil diameter EPD of the zoom lens, the maximum effective radius DT12 of the image side of the first lens E1, the effective focal length F2 of the second lens group G2, the effective focal length F3 of the third lens group G3, the axial distance SAG11 between the intersection of the object side of the first lens E1 and the optical axis and the vertex of the effective radius of the object side of the first lens E1, and the axial distance SAG12 between the intersection of the image side of the first lens E1 and the optical axis and the vertex of the effective radius of the image side of the first lens E1 are shown in Table 10 below.

[0110] Table 10: System Optical Parameters of Zoom Lenses

[0111] In summary, the zoom lenses in Examples 1 to 3 satisfy the relationships shown in Table 11, as detailed in Table 11.

[0112] Table 11: Relationships Satisfied by Zoom Lenses

[0113] It is worth mentioning that, according to one aspect of this application, one embodiment of this application further provides a camera module, which may include the aforementioned zoom lens and a photosensitive element, the photosensitive element being disposed on the image side of the zoom lens for image formation. It is understood that the photosensitive element mentioned in this application may, but is not limited to, be implemented as a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) device, and this application will not elaborate further on this.

[0114] Furthermore, according to another aspect of this application, one embodiment of this application provides an electronic device that may include a camera module and a processor as described above. The camera module is communicatively connected to the processor for acquiring image data and inputting the image data into the processor for processing. It is understood that the electronic device mentioned in this application may, but is not limited to, a device such as a mobile phone equipped with the camera module, and this application will not elaborate further on this.

[0115] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0116] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A zoom lens, characterized in that, It includes the following components arranged sequentially along the optical axis from the object side to the image side: a reflecting mirror, a first lens with positive optical power, a second lens with negative optical power, a third lens with either positive or negative optical power, a fourth lens with positive optical power, a fifth lens with negative optical power, a sixth lens with positive optical power, and a seventh lens with negative optical power. Wherein, the object-side surface and image-side surface of the first lens are convex and concave, respectively; the object-side surface and image-side surface of the second lens are convex and concave, respectively; the object-side surface and image-side surface of the third lens are convex and concave, respectively; the object-side surface and image-side surface of the fourth lens are both convex; the image-side surface of the fifth lens is concave; the object-side surface of the sixth lens is convex; and the image-side surface of the seventh lens is concave. Wherein, the first lens constitutes a first lens group, the first lens group has positive optical power, the second lens, the third lens and the fourth lens constitute a second lens group, the second lens group has positive optical power, the fifth lens, the sixth lens and the seventh lens constitute a third lens group, the third lens group has negative optical power, and the second lens group and the third lens group are movable along the optical axis to achieve zoom. The zoom lens contains seven lenses with optical power. In the zoom lens, there is an air gap between two adjacent lenses; The zoom lens also satisfies: 1.40 < (R² + R³) / (R² - R³) < 3.00; and -1.35 < (△T1 + △T2) / △f < -1.05; Wherein, R2 is the radius of curvature of the image side of the first lens; R3 is the radius of curvature of the object side of the second lens; △T1 is the change in air gap between the first lens group and the second lens group when the zoom lens zooms from the wide-angle end to the telephoto end; △T2 is the change in air gap between the second lens group and the third lens group when the zoom lens zooms from the wide-angle end to the telephoto end; △f is the difference in effective focal length of the optical system at the wide-angle end and the telephoto end of the zoom lens, respectively.

2. The zoom lens according to claim 1, characterized in that, The zoom lens also satisfies: 2.20 <R2 / △T1<5.05; Wherein, R2 is the radius of curvature of the image side of the first lens, and △T1 is the change in the air gap between the first lens group and the second lens group when the zoom lens zooms from the wide-angle end to the telephoto end.

3. The zoom lens according to claim 1, characterized in that, The zoom lens also satisfies: -1.55 <R8 / △T2<-1.25; Wherein, R8 is the radius of curvature of the image side of the fourth lens, and △T2 is the change in air gap between the second lens group and the third lens group when the zoom lens zooms from the wide-angle end to the telephoto end.

4. The zoom lens according to claim 1, characterized in that, The zoom lens further includes a filter placed on the image side of the seventh lens, and the zoom lens also satisfies: -0.65 <R14 / △T3<-0.35; Wherein, R14 is the radius of curvature of the image side of the seventh lens, and △T3 is the change in the air gap between the third lens group and the filter when the zoom lens zooms from the wide-angle end to the telephoto end.

5. The zoom lens according to claim 1, characterized in that, The zoom lens also satisfies: 2.15 < (V1 / V2) × (fW / fL) < 2.30; Wherein, V1 is the Abbe number of the first lens, V2 is the Abbe number of the second lens, fW is the effective focal length of the optical system when the zoom lens is at the wide-angle end, and fL is the effective focal length of the optical system when the zoom lens is at the telephoto end.

6. The zoom lens according to claim 1, characterized in that, The zoom lens also satisfies: 0.55 <DT12 / EPD<0.85; Wherein, DT12 is the maximum effective radius of the image side of the first lens, and EPD is the entrance pupil diameter of the zoom lens.

7. The zoom lens according to claim 1, characterized in that, The zoom lens further includes a filter placed on the image side of the seventh lens, and the zoom lens also satisfies: 0.75 <f7 / △T3<1.05; Where f7 is the effective focal length of the seventh lens, and ΔT3 is the change in the air gap between the third lens group and the filter when the zoom lens zooms from the wide-angle end to the telephoto end.

8. The zoom lens according to claim 1, characterized in that, The zoom lens also satisfies: 95.80 <f6 / T67×(V6 / N6)<155.65; Where f6 is the effective focal length of the sixth lens, T67 is the air gap between the sixth lens and the seventh lens on the optical axis, V6 is the Abbe number of the sixth lens, and N6 is the refractive index of the sixth lens.

9. The zoom lens according to claim 1, characterized in that, The zoom lens also satisfies: 2.15 <F2 / T2W<2.45; Where F2 is the effective focal length of the second lens group, and T2W is the distance on the optical axis between the second lens group and the third lens group when the zoom lens is at the wide-angle end.

10. The zoom lens according to claim 1, characterized in that, The zoom lens also satisfies: 3.10<(SAG11+SAG12) / (SAG11-SAG12)<5.65; Wherein, SAG11 is the axial distance between the intersection of the object side of the first lens and the optical axis and the vertex of the effective radius of the object side of the first lens, and SAG12 is the axial distance between the intersection of the image side of the first lens and the optical axis and the vertex of the effective radius of the image side of the first lens.

11. The zoom lens according to claim 1, characterized in that, The zoom lens also satisfies: 7.25mm <TTL×△tan(FOV)<11.55mm; Wherein, TTL is the on-axis distance from the object side of the first lens to the imaging plane of the zoom lens, and Δtan(FOV) is the difference in the tangent function value of the maximum field of view of the zoom lens when the zoom lens zooms from the wide-angle end to the telephoto end.

12. The zoom lens according to claim 1, characterized in that, The zoom lens also satisfies: 1.35 <T1W / T2W<3.25; Wherein, T1W is the distance on the optical axis between the first lens group and the second lens group when the zoom lens is located at the wide-angle end, and T2W is the distance on the optical axis between the second lens group and the third lens group when the zoom lens is located at the wide-angle end.

13. The zoom lens according to claim 1, characterized in that, The zoom lens also satisfies: -2.60 < (R13 + R14) / F3 < 0.65; Wherein, R13 is the radius of curvature of the object side of the seventh lens, R14 is the radius of curvature of the image side of the seventh lens, and F3 is the effective focal length of the third lens group.

14. The zoom lens according to claim 1, characterized in that, The zoom lens also satisfies: 4.30 <CT4 / T34<9.35; Wherein, CT4 is the center thickness of the fourth lens on the optical axis, and T34 is the air gap between the third lens and the fourth lens on the optical axis.

15. The zoom lens according to claim 1, characterized in that, The zoom lens also satisfies: -1.40 <f7 / f6<-0.65; Wherein, f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens.

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