Optical zoom imaging lens

Abstract

The application discloses an optical zoom imaging lens, wherein a first lens, a prism and a second lens constitute a first lens group with positive refractive power; a third lens, a fourth lens, a fifth lens and a sixth lens constitute a second lens group with positive refractive power; a seventh lens, an eighth lens and a ninth lens constitute a third lens group with negative refractive power; a combined focal length f12 of the first lens group, an effective focal length f3 of the third lens and an inner diameter d3s of a plane perpendicular to an optical axis of a third interval element satisfy a condition formula 1.52<=f12 / f3<=4.78 and a condition formula 1.82<=f3 / d3s<=5.51. The optical zoom imaging lens can effectively inhibit stray light, ensure miniaturization and have high imaging quality.

Description

Technical Field

[0001] This application generally relates to the field of optical equipment technology. More specifically, this application relates to an optical zoom imaging lens. Background Technology

[0002] With the widespread adoption of multi-camera systems in smartphones and the rapid development of continuous optical zoom technology, optical zoom lenses are constantly evolving towards miniaturization, high zoom ratios, and high image quality. Given the increasing trend towards thinner and lighter electronic devices, achieving high zoom capabilities, excellent image quality, and good mass production feasibility within limited space has become one of the core technological challenges that urgently need to be addressed in this field.

[0003] In existing technologies, to achieve high zoom ratios, optical path deflection elements (such as prisms) are typically used to change the original horizontal lens layout to a vertical one, in order to meet the thickness requirements of electronic devices such as mobile phones. In this type of lens, the prism is positioned before the lens group, and zoom is achieved by moving elements within the lens group. The advantage is its simple design, but the disadvantage is that the overall lens group is relatively long, making it unsuitable for designing a large aperture. Forcibly increasing the aperture increases the risk of stray light and aberrations, reducing image contrast and image quality. Summary of the Invention

[0004] In order to solve at least one or more of the technical problems mentioned above, this application proposes the following optical zoom imaging lens, which aims to achieve a miniaturized lens design while taking into account high imaging quality and mass production feasibility.

[0005] The optical zoom imaging lens provided in this application includes a first optical element group, a second optical element group, and a third optical element group, wherein the second optical element group is movable along the optical axis.

[0006] The first optical element group includes a first lens, a prism, and a second lens in sequence along the optical axis from the object side to the image side. The image side of the first lens is cemented to the incident surface of the prism, and the object side of the second lens is cemented to the exit surface of the prism. The second optical element group includes a first lens barrel, and the first lens barrel includes a third lens, a third spacer element, a fourth lens, a fifth lens and a sixth lens in sequence along the optical axis from the object side to the image side, wherein the third spacer element is at least partially in contact with the third lens; The third optical element group includes a second lens barrel, and the second lens barrel includes a seventh lens, an eighth lens, and a ninth lens in sequence along the optical axis from the object side to the image side. The first lens, the prism, and the second lens constitute a first lens group, wherein the first lens has positive optical power and the first lens group has positive optical power; the third lens, the fourth lens, the fifth lens, and the sixth lens constitute a second lens group, wherein the second lens group has positive optical power; the seventh lens, the eighth lens, and the ninth lens constitute a third lens group, wherein the ninth lens has negative optical power and the third lens group has negative optical power. The combined focal length f12 of the first lens group, the effective focal length f3 of the third lens, and the inner diameter d3s of the plane perpendicular to the optical axis of the object side of the third spacer element satisfy the following: 1.52≤f12 / f3≤4.78; 1.82≤f3 / d3s≤5.51.

[0007] In some embodiments, the radius of curvature R7 of the object side of the fourth lens and the inner diameter d3m of the plane perpendicular to the optical axis of the image side of the third spacer element satisfy the following: 0.75≤R7 / d3m≤1.10.

[0008] In some embodiments, a fourth spacer element is provided between the fourth lens and the fifth lens, and the fourth spacer element is at least partially in contact with the fourth lens; The inner diameter d4s of the object side of the fourth spacer element perpendicular to the optical axis and the radius of curvature R8 of the image side of the fourth lens satisfy the following: 1.38≤d4s / R8≤1.88.

[0009] In some embodiments, the image-side surface of the third spacer element and the object-side surface of the fourth spacer element are spaced apart by a distance EP34 along the optical axis, and the air gap T34 between the third lens and the fourth lens along the optical axis satisfies: 8.28≤EP34 / T34≤23.19.

[0010] In some embodiments, a seventh spacer element is provided between the seventh lens and the eighth lens, and the seventh spacer element is at least partially in contact with the seventh lens; The inner diameter d7s of the plane perpendicular to the optical axis of the object side of the seventh spacer element, and the air gap T78 between the seventh lens and the eighth lens on the optical axis satisfy: 4.75≤d7s / T78≤7.73.

[0011] In some embodiments, the distance EPb7 between the object side surface of the second lens barrel and the object side surface of the seventh spacer element along the optical axis, and the central thickness CT7 of the seventh lens on the optical axis, satisfy: 1.91≤EPb7 / CT7≤2.86.

[0012] In some embodiments, an eighth spacer element is provided between the eighth lens and the ninth lens, and the eighth spacer element is at least in contact with the eighth lens; The outer diameter D8s of the plane perpendicular to the optical axis of the object side of the eighth spacer element, and the air gap T89 between the eighth lens and the ninth lens on the optical axis satisfy: 5.95≤D8s / T89≤23.54.

[0013] In some embodiments, a fifth spacer element is disposed between the fifth lens and the sixth lens, and the fifth spacer element is at least partially in contact with the fifth lens; the image-side surface of the third spacer element and the object-side surface of the fourth spacer element are spaced EP34 along the optical axis, the image-side surface of the fourth spacer element and the object-side surface of the fifth spacer element are spaced EP45 along the optical axis, and the distance Tr8r11 on the optical axis from the image-side surface of the fourth lens to the object-side surface of the sixth lens satisfies: 0.97≤(EP34+EP45) / Tr8r11≤1.53.

[0014] In some embodiments, the central thickness CT3 of the third lens on the optical axis, the inner diameter of the object side of the third spacer perpendicular to the plane of the optical axis, and the outer diameter D3s of the object side of the third spacer perpendicular to the plane of the optical axis satisfy the following condition: 0.59≤CT3 / (D3s-d3s)≤0.82.

[0015] In some embodiments, the maximum horizontal distance La from the object side to the image side of the first lens barrel along the optical axis, the center thickness CT3 of the third lens on the optical axis, the center thickness CT4 of the fourth lens 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 the following: 1.14≤La / (CT3+CT4+CT5+CT6)≤1.29.

[0016] In some embodiments, the maximum horizontal distance Lb from the object side to the image side of the second lens barrel along the optical axis, the air gap T78 between the seventh lens and the eighth lens on the optical axis, and the air gap T89 between the eighth lens and the ninth lens on the optical axis satisfy the following: 2.26≤Lb / (T78+T89)≤3.06.

[0017] In some embodiments, the effective focal length f7 of the seventh lens and the outer diameter D7s of the object side of the seventh spacer element perpendicular to the optical axis satisfy the following: -3.99≤f7 / D7s≤8.39.

[0018] In some embodiments, the effective focal length f9 of the ninth lens and the inner diameter d8m of the plane perpendicular to the optical axis of the image side of the eighth spacer element satisfy the following condition: -4.07≤f9 / d8m≤2.56.

[0019] In some embodiments, the combined focal length of the second lens group is f789, and the inner diameter dbs of the object side of the second lens barrel perpendicular to the optical axis satisfies: -3.33≤f789 / dbs≤-2.63.

[0020] In some embodiments, both the first lens and the second lens are non-circular lenses. The first lens is symmetrically provided with parallel first and second chopped edges, and the second lens is symmetrically provided with parallel third and fourth chopped edges. The first lens has a first screen printing layer and a second screen printing layer on its object-side effective diameter near the first and second chopped edges, and the second lens has a third screen printing layer and a fourth screen printing layer on its image-side effective diameter near the third and fourth chopped edges. The first, second, third, and fourth silkscreen layers are all wavy and satisfy the following conditions: 3.85 < a1 / b1 < 5.30, 0.85 ≤ H1 / D1 < 0.90, 4.10 < a2 / b2 < 6.05, 0.80 < H2 / D2 < 0.90, where a1 is the horizontal distance between adjacent peaks of the first or second silkscreen layer, a2 is the horizontal distance between adjacent peaks of the third or fourth silkscreen layer, and b1 is the distance between the peaks and troughs of the first or second silkscreen layer. The vertical height difference is given by: b2 being the vertical height difference between the peaks and troughs of the third or fourth silkscreen layer; H1 being the horizontal distance from the trough of the first or second silkscreen layer to the center of the first lens; H2 being the horizontal distance from the trough of the third or fourth silkscreen layer to the center of the second lens; D1 being the horizontal distance from the edge of the first or second cut edge to the center of the first lens; and D2 being the horizontal distance from the edge of the third or fourth cut edge to the center of the second lens.

[0021] Through the optical zoom imaging lens provided above, this embodiment of the application achieves integrated optical path reversal and spatial compression by adopting a double-cemented prism structure in which the first lens, prism, and second lens are sequentially cemented together in the first lens group, thereby reducing the overall size of the lens. By constraining the ratio of the combined focal length f12 of the first lens group to the effective focal length f3 of the third lens to satisfy 1.52≤f12 / f3≤4.78, the optical power of the first lens group and the third lens is reasonably distributed, suppressing aberrations. However, the third lens belongs to the second optical element group. During the movement of the second optical element group, the position of the third lens away from the optical axis is prone to introducing stray light. Therefore, by constraining the ratio of the effective focal length f3 of the third lens to the inner diameter d3s of the object side of the third spacer element to satisfy 1.82≤f3 / d3s≤5.51, the inner diameter of the third spacer element is adapted to the optical characteristics of the third lens, effectively blocking stray light from the position of the third lens away from the optical axis without interfering with the effective light transmission. Attached Figure Description

[0022] The above and other objects, features, and advantages of exemplary embodiments of this application will become readily understood by reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of this application are illustrated by way of example and not limitation, and the same or corresponding reference numerals denote the same or corresponding parts, wherein: Figure 1 An exemplary structural diagram of an optical zoom imaging lens according to an embodiment of this application is shown; Figure 2 An exemplary dimensioning diagram of an optical zoom imaging lens according to an embodiment of this application is shown; Figure 3 A schematic diagram of the structure of the first optical component according to an embodiment of this application is shown; Figure 4 A schematic diagram of the first lens screen printing structure according to an embodiment of this application is shown; Figure 5 A schematic diagram of the second lens screen printing structure according to an embodiment of this application is shown; Figure 6 A schematic diagram of the stray light suppression effect of the optical zoom imaging lens according to an embodiment of this application is shown when f12 / f3=4.78 and f3 / d3s=3.23; Figure 7 The diagram illustrates the stray light suppression effect of the optical zoom imaging lens of this application when f12 / f3=4.78 and f3 / d3s=1.15. Figure 8 The diagram illustrates the stray light suppression effect of the optical zoom imaging lens of this application when f12 / f3=4.78 and f3 / d3s=5.83. Figure 9This shows a schematic diagram of the structure of the optical zoom imaging lens in the first state according to Embodiment 1-1 of this application; Figure 10 This shows a schematic diagram of the structure of the optical zoom imaging lens in the second state according to Embodiment 1-1 of this application; Figure 11 The diagram shows the structure of the optical zoom imaging lens in its first state according to embodiments 1-2 of this application; Figure 12 The diagram shows the structure of the optical zoom imaging lens in the second state according to embodiments 1-2 of this application; Figure 13 The diagram shows the structure of the optical zoom imaging lens in its first state according to embodiments 1-3 of this application; Figure 14 The diagram shows the structure of the optical zoom imaging lens in the second state according to embodiments 1-3 of this application; Figure 15 An optical drawing of an optical zoom imaging lens according to Embodiment 1 of this application is shown; Figure 16 This shows a schematic diagram of the structure of the optical zoom imaging lens in the first state according to Embodiment 2-1 of this application; Figure 17 This shows a schematic diagram of the structure of the optical zoom imaging lens in the second state according to Embodiment 2-1 of this application; Figure 18 This shows a schematic diagram of the structure of the optical zoom imaging lens in the first state according to Embodiment 2-2 of this application; Figure 19 This shows a schematic diagram of the structure of the optical zoom imaging lens in the second state according to Embodiment 2-2 of this application; Figure 20 The diagram shows the structure of the optical zoom imaging lens in its first state according to embodiments 2-3 of this application; Figure 21 The diagram shows the structure of the optical zoom imaging lens in the second state according to embodiments 2-3 of this application; Figure 22 An optical drawing of an optical zoom imaging lens according to Embodiment 2 of this application is shown; Figure 23 This shows a schematic diagram of the structure of the optical zoom imaging lens in the first state according to Embodiment 3-1 of this application; Figure 24 This shows a schematic diagram of the structure of the optical zoom imaging lens in the second state according to Embodiment 3-1 of this application; Figure 25 This shows a schematic diagram of the structure of the optical zoom imaging lens in the first state according to Embodiment 3-2 of this application; Figure 26This shows a schematic diagram of the structure of the optical zoom imaging lens in the second state according to Embodiment 3-2 of this application; Figure 27 This shows a schematic diagram of the structure of the optical zoom imaging lens in the first state according to Embodiment 3-3 of this application; Figure 28 This shows a schematic diagram of the structure of the optical zoom imaging lens in the second state according to Embodiment 3-3 of this application; Figure 29 An optical diagram of an optical zoom imaging lens according to Embodiment 3 of this application is shown. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0024] It should be understood that the terms "comprising" and "including" used in the specification and claims of this application indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0025] It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application. As used in this specification and claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this specification and claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0026] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0027] In this application, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this application.

[0028] 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 feature.

[0029] In the accompanying drawings, for ease of illustration, the thickness, size, and shape of the lenses (hereinafter referred to as lens elements) have been slightly exaggerated. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not drawn strictly to scale.

[0030] In this specification, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of that 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 that 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 the judgment method commonly known in the art, using the R value (R refers to the radius of curvature of the paraxial region, usually the R value in the lens database of optical software) to determine convexity or concavity. For the object side, 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, 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.

[0031] In this application, the object side refers to the side of the optical zoom imaging lens facing the object being photographed (not shown in the figure), and the image side refers to the side of the optical zoom imaging lens facing the imaging plane. In the following text, the object side of the lens refers to the surface of the lens facing the object being photographed (not shown in the figure), and the image side of the lens refers to the surface of the lens facing the imaging plane. In the structural schematic diagram shown in this application, the left side is the object side, and the right side is the image side.

[0032] To facilitate understanding, let's first combine... Figures 1 to 5 The structure and dimensions of some parts of the optical zoom imaging lens of this application are described in detail to provide a clear and intuitive understanding of what these structures and dimensions refer to. For ease of description, the surface shapes of each lens in the optical zoom imaging lens will be described later in specific embodiments, and these parameters will not be shown here.

[0033] Figure 1 An exemplary structural diagram of an optical zoom imaging lens according to an embodiment of this application is shown. Figure 1As shown, Pa is the first lens tube, Pb is the second lens tube, P3 is the third spacer element, P4 is the fourth spacer element, P5 is the fifth spacer element, P6 is the sixth spacer element, P7 is the seventh spacer element, and P8 is the eighth spacer element. S1 is the object-side surface of the first lens, S2 is the image-side surface of the first lens, S3 is the object-side surface of the second lens, S4 is the image-side surface of the second lens, S5 is the object-side surface of the third lens, S6 is the image-side surface of the third lens, S7 is the object-side surface of the fourth lens, S8 is the image-side surface of the fourth lens, S9 is the object-side surface of the fifth lens, S10 is the image-side surface of the fifth lens, S11 is the object-side surface of the sixth lens, S12 is the image-side surface of the sixth lens, S13 is the object-side surface of the seventh lens, S14 is the image-side surface of the seventh lens, S15 is the object-side surface of the eighth lens, S16 is the image-side surface of the eighth lens, S17 is the object-side surface of the ninth lens, S18 is the image-side surface of the ninth lens, S19 is the object-side surface of the filter or protective glass, S20 can be the image-side surface of the filter or protective glass, and S21 is the imaging surface.

[0034] Figure 2 An exemplary dimensioning diagram of an optical zoom imaging lens according to an embodiment of this application is shown. Figure 2 As shown, D3s is the outer diameter of the object-side surface of the third spacer element perpendicular to the optical axis in the plane; d3s is the inner diameter of the object-side surface of the third spacer element perpendicular to the optical axis in the plane; d3m is the inner diameter of the image-side surface of the third spacer element perpendicular to the optical axis in the plane; d4s is the inner diameter of the object-side surface of the fourth spacer element perpendicular to the optical axis in the plane; dbs is the inner diameter of the object-side surface of the second lens tube perpendicular to the optical axis in the plane; d7s is the inner diameter of the object-side surface of the seventh spacer element perpendicular to the optical axis in the plane; d8m is the inner diameter of the image-side surface of the eighth spacer element perpendicular to the optical axis in the plane; and D7s is the outer diameter of the object-side surface of the seventh spacer element perpendicular to the optical axis in the plane. The outer diameter of the plane, D8s is the outer diameter of the plane perpendicular to the optical axis of the object side of the eighth spacer element, La is the maximum horizontal distance along the optical axis from the object side of the first lens tube to its image side, Lb is the maximum horizontal distance along the optical axis from the object side of the second lens tube to its image side, EP34 is the spacing distance along the optical axis between the image side of the third spacer element and the object side of the fourth spacer element, EP45 is the spacing distance along the optical axis between the image side of the fourth spacer element and the object side of the fifth spacer element, and EPb7 is the spacing distance along the optical axis between the object side of the second lens tube and the object side of the seventh spacer element.

[0035] Figure 3 A schematic diagram of the structure of a first optical component according to an embodiment of this application is shown. Figure 3As shown, the first optical component includes a first lens E1, a prism P, and a second lens E2. Both the first lens E1 and the second lens E2 are non-circular lenses. The first lens E1 has symmetrically arranged parallel first and second chopped edges, and the second lens E2 has symmetrically arranged parallel third and fourth chopped edges. On the object-side surface of the first lens E1, near the first and second chopped edges, a first silkscreen layer Y1 and a second silkscreen layer Y2 extending in a wavy shape are respectively provided. On the image-side surface of the second lens E2, near the third and fourth chopped edges, a third silkscreen layer Y3 and a fourth silkscreen layer Y4 extending in a wavy shape are respectively provided.

[0036] Figure 4 A schematic diagram of the first lens screen printing structure according to an embodiment of this application is shown. Figure 4 As shown, a1 is the horizontal distance between adjacent peaks of the first silkscreen layer Y1 or the second silkscreen layer Y2, b1 is the vertical height difference between the peaks and troughs of the first silkscreen layer Y1 or the second silkscreen layer Y2, H1 is the horizontal distance from the trough of the first silkscreen layer Y1 or the second silkscreen layer Y2 to the center of the first lens, and D1 is the horizontal distance from the edge of the first cut edge or the second cut edge to the center of the first lens.

[0037] Figure 5 A schematic diagram of the second lens screen printing structure according to an embodiment of this application is shown. Figure 5 As shown, a2 is the horizontal distance between adjacent peaks of the third silkscreen layer Y3 or the fourth silkscreen layer Y4, b2 is the vertical height difference between the peaks and troughs of the third silkscreen layer Y3 or the fourth silkscreen layer Y4, H2 is the horizontal distance from the trough of the third silkscreen layer Y3 or the fourth silkscreen layer Y4 to the center of the second lens, and D2 is the horizontal distance from the edge of the third or fourth chopped portion to the center of the second lens.

[0038] It should be noted that embodiments of this application may also include those without bonding. Figures 1 to 5 Other structures and dimensions described will not be repeated here. Furthermore, the optical axis mentioned above and below specifically refers to the central axis of symmetry of the optical zoom imaging lens, around which all lenses are arranged coaxially. The axial distance mentioned above and below refers to the direction of the optical axis of the optical zoom imaging lens, the straight-line distance between two optical surfaces (or structural features).

[0039] Next, the optical zoom imaging lens provided in this application will be described in detail. The optical zoom imaging lens includes a first optical element group, a second optical element group and a third optical element group, wherein the second optical element group is movable along the optical axis.

[0040] Specifically, the first optical element group includes, in sequence along the optical axis from the object side to the image side, a first lens, a prism, and a second lens. The image-side surface of the first lens is cemented to the incident surface of the prism, and the object-side surface of the second lens is cemented to the exit surface of the prism. The second optical element group includes a first lens barrel, within which, in sequence along the optical axis from the object side to the image side, a third lens, a third spacer element, a fourth lens, a fifth lens, and a sixth lens are included, and the third spacer element is at least partially in contact with the third lens. The third optical element group includes a second lens barrel, within which, in sequence along the optical axis from the object side to the image side, a seventh lens, an eighth lens, and a ninth lens are included.

[0041] Furthermore, the first lens, the prism, and the second lens constitute a first lens group, wherein the first lens has positive optical power and the second lens group has positive optical power; the third lens, the fourth lens, the fifth lens, and the sixth lens constitute a second lens group, which has positive optical power; the seventh lens, the eighth lens, and the ninth lens constitute a third lens group, wherein the ninth lens has negative optical power and the third lens group has negative optical power.

[0042] Based on the above structure, the combined focal length f12 of the first lens group, the effective focal length f3 of the third lens, and the inner diameter d3s of the plane perpendicular to the optical axis of the object side of the third spacer element satisfy the conditions 1.52≤f12 / f3≤4.78 and 1.82≤f3 / d3s≤5.51.

[0043] To clearly demonstrate the specific impact of the above parameter constraints on stray light suppression, we will now combine... Figures 6 to 8 An analysis is conducted. Under the condition that 1.52 ≤ f12 / f3 ≤ 4.78, the performance of the optical zoom lens is examined for different values ​​of f3 / d3s. Figures 6 to 8 In this context, Geometrical Ray Spots represents a geometric ray spot diagram, X and Y represent the spatial positions on the image plane, and the unit is millimeters (mm). FLUX / sq-MM represents the flux per square millimeter.

[0044] like Figure 6 As shown, when f12 / f3 is 4.78 and f3 / d3s is 3.23, which is within the range of 1.82 to 5.51 defined in this application, no obvious and discrete stray light energy signal appears. This indicates that the inner diameter d3s of the third spacer element can be well matched with the optical characteristics (focal length f3) of the third lens, effectively blocking the extra stray light generated by the third lens away from the optical axis.

[0045] like Figure 7As shown, when f12 / f3 is 4.78 and f3 / d3s is 1.15, which is lower than the lower limit of 1.82 specified in this application, a large number of irregularly distributed, low-energy discrete light spots appear. These discrete light spots are the excess stray light that has not been effectively intercepted. This is because when the ratio of f3 / d3s is too small, the inner diameter d3s of the third spacer element is too large relative to the focal length f3 of the third lens, resulting in insufficient blocking ability of the third spacer element for stray light at the lens gap, allowing the stray light to pass through the third spacer element and eventually reach the image plane.

[0046] like Figure 8 As shown, when f12 / f3 is 4.78 and f3 / d3s is 5.83, which is higher than the upper limit of 5.51 specified in this application, a large number of irregularly distributed, low-energy discrete light spots appear. These are the excess stray light that has not been effectively intercepted. This is because when the ratio of f3 / d3s is too large, it means that the inner diameter d3s of the third spacer element is too small relative to the focal length f3 of the third lens. The edge of the excessively small inner diameter of the third spacer becomes a new source of diffraction or reflection, thus generating additional stray light.

[0047] The above comparative analysis shows that the optical zoom imaging lens provided in this application reduces the overall size of the lens by adopting a double-cemented prism structure in the first lens group, in which the first lens, prism, and second lens are cemented together in sequence. By constraining the ratio of the combined focal length f12 of the first lens group to the effective focal length f3 of the third lens to satisfy 1.52≤f12 / f3≤4.78, the optical power of the first lens group and the third lens is reasonably distributed, suppressing aberrations. However, the third lens belongs to the second optical element group. During the movement of the second optical element group, the position of the third lens away from the optical axis is prone to introducing stray light. Therefore, by constraining the ratio of the effective focal length f3 of the third lens to the inner diameter d3s of the object side of the third spacer element to satisfy 1.82≤f3 / d3s≤5.51, the inner diameter of the third spacer element can be adapted according to the optical characteristics of the third lens. Under the premise of not interfering with the effective light transmission, stray light from the position of the third lens away from the optical axis is effectively blocked.

[0048] In some embodiments of this application, the radius of curvature R7 of the object-side surface of the fourth lens and the inner diameter d3m of the image-side surface of the third spacer element perpendicular to the optical axis satisfy 0.75 ≤ R7 / d3m ≤ 1.10. By constraining the ratio of the radius of curvature of the object-side surface of the fourth lens to the inner diameter of the image-side surface of the third spacer element perpendicular to the optical axis within a reasonable range, an effective light-blocking structure is formed in the edge region of the fourth lens. This structure can block excess stray light escaping from the edge of the object-side surface of the fourth lens or entering the lens gap after reflection from the inner wall of the lens barrel, preventing it from reaching the image plane and interfering with imaging. Thus, without sacrificing optical performance, the stray light problem is improved, and the image quality is enhanced.

[0049] In some embodiments of this application, a fourth spacer element is disposed between the fourth lens and the fifth lens, and the fourth spacer element is at least partially in contact with the fourth lens. Based on this, the inner diameter d4s of the object-side surface of the fourth spacer element perpendicular to the optical axis and the radius of curvature R8 of the image-side surface of the fourth lens satisfy the condition 1.38≤d4s / R8≤1.88. By constraining the ratio of the inner diameter of the object-side surface of the fourth spacer element perpendicular to the optical axis to the radius of curvature of the image-side surface of the fourth lens within a reasonable range, a light-blocking structure is formed at the edge of the image-side surface of the fourth lens. This structure can block light rays emanating from the edge of the image-side surface of the fourth lens, suppressing internal reflection of light between the image-side surface of the fourth lens and the inner wall of the fourth spacer element, reducing such internal reflection stray light from entering the subsequent optical path and interfering with imaging, thereby improving light leakage and stray light conditions while maintaining optical performance.

[0050] In some embodiments of this application, the distance EP34 between the image-side surface of the third spacer element and the object-side surface of the fourth spacer element along the optical axis, and the air gap T34 between the third and fourth lenses along the optical axis, satisfy the condition 8.28 ≤ EP34 / T34 ≤ 23.19. By constraining the ratio of the distance EP34 between the image-side surface of the third spacer element and the object-side surface of the fourth spacer element along the optical axis to the air gap T34 between the third and fourth lenses along the optical axis to a reasonable range, a support structure is provided for the third lens. This support structure helps reduce the positional displacement of the third lens during assembly, improves lens assembly stability, and increases production yield.

[0051] In some embodiments of this application, a seventh spacer element is provided between the seventh lens and the eighth lens, and the seventh spacer element is at least partially in contact with the seventh lens. Based on this, the inner diameter d7s of the plane perpendicular to the optical axis of the object-side surface of the seventh spacer element, and the air gap T78 between the seventh and eighth lenses on the optical axis satisfy the condition 4.75≤d7s / T78≤7.73. By constraining the ratio of the inner diameter of the plane perpendicular to the optical axis of the object-side surface of the seventh spacer element to the air gap between the seventh and eighth lenses on the optical axis within a reasonable range, a light-blocking structure can be formed on the image-side surface of the seventh lens. This light-blocking structure can block stray light escaping from the edge of the image-side surface of the seventh lens, or reflected back through the rear end of the lens barrel and the color filter, without obstructing the main ray system. This reduces internal reflections or light leakage within the lens gap, lowers the possibility of it entering the subsequent optical path and interfering with imaging, and thus helps improve image quality.

[0052] In some embodiments of this application, the distance EPb7 between the object side surface of the second lens barrel and the object side surface of the seventh spacer element along the optical axis, and the center thickness CT7 of the seventh lens along the optical axis, satisfy the condition 1.91≤EPb7 / CT7≤2.86. By constraining the ratio of the distance EPb7 between the object side surface of the second lens barrel and the object side surface of the seventh spacer element along the optical axis to the center thickness of the seventh lens along the optical axis within a reasonable range, it is beneficial to make the head thickness of the second lens barrel and the center thickness of the seventh lens form an appropriate ratio. This reduces the risk of lens barrel or lens deformation due to thickness mismatch during assembly, improves bearing stability and assembly reliability, and helps to avoid space waste caused by excessive thickness of the lens barrel head, while also ensuring structural compactness.

[0053] In some embodiments of this application, an eighth spacer element is provided between the eighth lens and the ninth lens, and the eighth spacer element is at least partially in contact with the eighth lens. Based on this, the outer diameter D8s of the plane perpendicular to the optical axis of the object-side surface of the eighth spacer element, and the air gap T89 between the eighth and ninth lenses on the optical axis satisfy the condition 5.95≤D8s / T89≤23.54. By constraining the ratio of the outer diameter of the plane perpendicular to the optical axis of the object-side surface of the eighth spacer element to the air gap between the eighth and ninth lenses on the optical axis within a reasonable range, the eighth spacer element possesses the strength to maintain assembly stability.

[0054] In some embodiments of this application, the spacing distance EP34 between the image-side surface of the third spacer element and the object-side surface of the fourth spacer element along the optical axis, the spacing distance EP45 between the image-side surface of the fourth spacer element and the object-side surface of the fifth spacer element along the optical axis, and the distance Tr8r11 on the optical axis from the image-side surface of the fourth lens to the object-side surface of the sixth lens satisfy the condition 0.97≤(EP34+EP45) / Tr8r11≤1.53. By constraining the ratio of the sum of the spacing distances along the optical axis between the image-side surface of the third spacer element and the object-side surface of the fourth spacer element, and the spacing distances along the optical axis between the image-side surface of the fourth spacer element and the object-side surface of the fifth spacer element, to the distance on the optical axis from the image-side surface of the fourth lens to the object-side surface of the sixth lens, the fourth, fifth, and sixth lenses are made more compact, meeting the miniaturization requirements.

[0055] In some embodiments of this application, the central thickness CT3 of the third lens on the optical axis, the inner diameter of the object-side surface of the third spacer perpendicular to the optical axis, and the outer diameter D3s of the object-side surface of the third spacer perpendicular to the optical axis satisfy the condition 0.59≤CT3 / (D3s-d3s)≤0.82. By constraining the ratio of the central thickness of the third lens on the optical axis to the width of the three spacers within a reasonable range, the width of the annular band of the third spacer is matched with the central thickness of the third lens, ensuring that the annular band has sufficient structural strength to support the third lens while meeting the requirements of miniaturization.

[0056] In some embodiments of this application, the maximum horizontal distance La from the object side to the image side of the first lens barrel along the optical axis, the center thickness CT3 of the third lens along the optical axis, the center thickness CT4 of the fourth lens along the optical axis, the center thickness CT5 of the fifth lens along the optical axis, and the center thickness CT6 of the sixth lens along the optical axis satisfy the condition 1.14≤La / (CT3+CT4+CT5+CT6)≤1.29. By constraining the ratio of the maximum length of the first lens barrel to the sum of the center thicknesses of the third, fourth, fifth, and sixth lenses within a reasonable range, the axial length of the first lens barrel is matched with the sum of the center thicknesses of each lens in the second lens group. Specifically, if La is too small relative to the total thickness of the lenses, the axial space inside the lens barrel is insufficient, and the lens group may not be fully accommodated or the contact surface may not be sufficient, resulting in lens bulging or unstable positioning; if La is too large, there is too much room for movement of the lens group along the optical axis inside the barrel, and axial positional shift is likely to occur during assembly. Limiting the ratio to the above range helps to coordinate the axial dimensions of the inner wall of the lens barrel with those of the lens group, providing stable positioning support for the third to sixth lenses, reducing positional offset during assembly, and avoiding axial space waste caused by redundant lens barrel length, making the lens structure more compact.

[0057] In some embodiments of this application, the maximum horizontal distance Lb from the object side to the image side of the second lens barrel along the optical axis, the air gap T78 between the seventh and eighth lenses on the optical axis, and the air gap T89 between the eighth and ninth lenses on the optical axis satisfy the condition 2.26≤Lb / (T78+T89)≤3.06. By constraining the ratio of this condition within a reasonable range, the length of the second lens barrel is matched with the total air gap of the third lens group, reducing the size increase caused by the redundancy of the lens barrel length, thereby ensuring imaging quality while also meeting the miniaturization requirements.

[0058] In some embodiments of this application, the effective focal length f7 of the seventh lens and the outer diameter D7s of the object-side surface of the seventh spacer perpendicular to the optical axis satisfy the condition -3.99 ≤ f7 / D7s ≤ 8.39. By constraining the ratio of the effective focal length of the seventh lens to the outer diameter of the object-side surface of the seventh spacer perpendicular to the optical axis within a reasonable range, the outer diameter of the seventh spacer is matched with the effective focal length of the seventh lens, thereby helping to control the radial space occupied by the seventh spacer within the lens barrel, thus reducing material usage and lowering production costs.

[0059] In some embodiments of this application, the effective focal length f9 of the ninth lens and the inner diameter d8m of the image-side surface of the eighth spacer element perpendicular to the optical axis satisfy the condition -4.07 ≤ f9 / d8m ≤ 2.56. By constraining the ratio of the effective focal length of the ninth lens to the inner diameter of the image-side surface of the eighth spacer element perpendicular to the optical axis within a reasonable range, the inner diameter of the image-side surface of the eighth spacer element is matched with the effective focal length of the ninth lens, thereby forming a light-blocking structure on the image-side surface of the eighth spacer element. This structure can block light rays escaping from the edge of the image-side surface of the ninth lens or reflected by the inner wall of the lens barrel and incident on the image surface, reducing the possibility of them entering the final imaging optical path and interfering with image quality, and helping to improve stray light.

[0060] In some embodiments of this application, the combined focal length f789 of the second lens group and the inner diameter dbs of the object-side surface of the second lens barrel perpendicular to the optical axis satisfy the condition -3.33 ≤ f789 / dbs ≤ -2.63. By constraining the ratio of the inner diameter of the object-side surface of the second lens barrel perpendicular to the optical axis to the combined focal length of the second lens group within a reasonable range, a light-blocking structure is formed at the object-side entrance of the second lens barrel. This structure can block excess stray light incident from the front of the third lens group that may enter the gap between the lens groups after reflection by the inner wall of the lens barrel, reducing the possibility of internal reflection or scattering between the lens groups, lowering the risk of it reaching the image plane and interfering with imaging, and helping to improve image quality.

[0061] In some embodiments of this application, both the first lens and the second lens are non-circular lenses. The first lens has symmetrically arranged parallel first and second chopped edges, and the second lens has symmetrically arranged parallel third and fourth chopped edges. A first screen printing layer Y1 and a second screen printing layer Y2 are disposed on the object-side effective diameter of the first lens near the first and second chopped edges, and a third screen printing layer Y3 and a fourth screen printing layer Y4 are disposed on the image-side effective diameter of the second lens near the third and fourth chopped edges. The first screen printing layer Y1, the second screen printing layer Y2, the third screen printing layer Y3, and the fourth screen printing layer Y4 are all wavy and satisfy the following conditions: 3.85 < a1 / b1 < 5.30, 0.85 ≤ H1 / D1 < 0.90, 4.10 < a2 / b2 < 6.05, 0.80 < H2 / D2 < 0.90. 0.90, where a1 is the horizontal distance between adjacent peaks of the first silkscreen layer Y1 or the second silkscreen layer Y2, a2 ​​is the horizontal distance between adjacent peaks of the third silkscreen layer Y3 or the fourth silkscreen layer Y4, b1 is the vertical height difference between the peaks and troughs of the first silkscreen layer Y1 or the second silkscreen layer Y2, b2 is the vertical height difference between the peaks and troughs of the third silkscreen layer Y3 or the fourth silkscreen layer Y4, H1 is the horizontal distance from the trough of the first silkscreen layer Y1 or the second silkscreen layer Y2 to the center of the first lens, H2 is the horizontal distance from the trough of the third silkscreen layer Y3 or the fourth silkscreen layer Y4 to the center of the second lens, D1 is the horizontal distance from the edge of the first or second chopped portion to the center of the first lens, and D2 is the horizontal distance from the edge of the third or fourth chopped portion to the center of the second lens.

[0062] In optical systems that include prisms, there is usually a noticeable diffraction-type stray light phenomenon at the straight edges of the lenses. This application coats the chamfered edges of the first and second cemented lenses with a wavy screen-printed layer, satisfying the conditions 3.85 < a1 / b1 < 5.30 and 4.10 < a2 / b2 < 6.05. This wavy screen-printed layer within the specified range disrupts the originally neat and regular diffraction phenomenon, making its distribution more disordered and mutually canceling each other out. This disperses the concentrated diffraction energy, making stray light phenomena more blurred and soft. At the same time, the layout range of the screen-printed layer is limited by satisfying the conditions 0.85 ≤ H1 / D1 < 0.90 and 0.80 < H2 / D2 < 0.90. If the screen-printed area is too small, the effect of improving stray light will be insufficient. If the screen-printed area is too large, it may block the main light of the optical system, resulting in vignetting in the captured image. Limiting the layout range of the screen-printed layer within the above conditions helps to reduce the impact of blocking the main light while taking into account the effect of improving stray light. The following description, with reference to the accompanying drawings, further illustrates examples of specific surface shapes and parameters of optical zoom imaging lenses applicable to the above embodiments.

[0063] It should be noted that in the following Embodiment 1, there are three examples: Embodiment 1-1, Embodiment 1-2, and Embodiment 1-3; in Embodiment 2, there are three examples: Embodiment 2-1, Embodiment 2-2, and Embodiment 2-3; and in Embodiment 3, there are three examples: Embodiment 3-1, Embodiment 3-2, and Embodiment 3-3.

[0064] In the three examples within the same embodiment, the surface parameters, higher-order coefficients of the aspherical surface, and optical parameters of the optical zoom imaging lens are identical, while the structural parameters of the lens barrel and spacer elements differ. Therefore, the values ​​of each conditional expression also differ in different examples within the same embodiment, and in different examples within different embodiments, but all remain within the range of values ​​satisfied by the aforementioned conditional expressions.

[0065] It should be noted that any one of the examples in Embodiments 1 to 3 described below is applicable to all implementations of this application.

[0066] Example 1 Figure 9 This diagram shows the structure of the optical zoom imaging lens in its first state according to Embodiment 1-1 of this application. Figure 10 This diagram shows the structure of the optical zoom imaging lens in its second state according to Embodiment 1-1 of this application. Figure 11 The diagram shows the structure of the optical zoom imaging lens in its first state according to embodiments 1-2 of this application. Figure 12 The diagram shows the structure of the optical zoom imaging lens in the second state according to embodiments 1-2 of this application. Figure 13 The diagram shows the structure of the optical zoom imaging lens in its first state according to embodiments 1-3 of this application. Figure 14 The diagram shows the structure of the optical zoom imaging lens in the second state of Embodiments 1-3 of this application.

[0067] like Figures 9 to 14 As shown, the optical zoom imaging lens includes a first optical element group, a second optical element group, and a third optical element group.

[0068] The first optical element group includes, along the optical axis from the object side to the image side, a first lens E1, a prism P, and a second lens E2, wherein the image-side surface S2 of the first lens E1 is cemented with the incident surface of the prism P, and the object-side surface S3 of the second lens E2 is cemented with the exit surface of the prism P; the second optical element group includes a first lens barrel, within which, along the optical axis from the object side to the image side, a third lens E3, a third spacer element (not shown in the figure), a fourth lens E4, a fifth lens E5, and a sixth lens E6, wherein the third spacer element is at least partially in contact with the third lens E3; the third optical element group includes a second lens barrel, within which, along the optical axis from the object side to the image side, a seventh lens E7, an eighth lens E8, and a ninth lens E9, are sequentially included.

[0069] Table 1 below shows the basic structural parameters of the optical zoom imaging lens of Embodiment 1 under Embodiments 1-1, 1-2, and 1-3. The units for radius of curvature and center thickness / spacing are millimeters (mm). In Table 1, OBJ (not shown in the figure) represents the object plane, and STO (not shown in the figure) represents the aperture stop. Table 1

[0070] As shown in Table 1, in Embodiment 1, the object-side surface S1 of the first lens E1, the image-side surface S4 of the second lens E2, and the object-side and image-side surfaces of the third lens E3 to the ninth lens E9 are all aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula (1): Formula (1) Where x is the distance vector from the vertex of the aspherical surface along the optical axis at a height of h; c is the paraxial curvature of the aspherical surface, c=1 / R, that is, the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above; k is the conic coefficient; These are the i-th order correction coefficients for aspherical surfaces. Tables 2-1 and 2-2 below give the higher-order coefficients A4, A6...A24 that can be used for each aspherical mirror in Example 1.

[0071] Table 2-1

[0072] Table 2-2

[0073] In Embodiment 1, the second optical element group can move along the optical axis to change the focal length state of the optical zoom lens, specifically including a first state (telephoto state) and a second state (macro state). The object distance and the spacing between the lens groups change accordingly in different states as shown in Table 3 below, where f is the total focal length of the system, fno is the aperture number, D1 is the object distance, D2 is the spacing between the object-side surface of the third lens and the image-side surface of the second lens, and D3 is the spacing between the object-side surface of the seventh lens and the image-side surface of the sixth lens.

[0074] Table 3

[0075] Furthermore, in Embodiment 1, the first lens E1, prism P, and the second lens E2 constitute the first lens group, which has positive optical power; the third lens E3, the fourth lens E4, the fifth lens E5, and the sixth lens E6 constitute the second lens group, which has positive optical power; and the seventh lens E7, the eighth lens E8, and the ninth lens E9 constitute the third lens group, which has negative optical power. The optical parameters of the optical zoom imaging lens of Embodiment 1 under Embodiments 1-1, 1-2, and 1-3 are shown in Table 10 below (unit: mm), the structural parameters are shown in Table 11 below (unit: mm), and the values ​​of each conditional expression are shown in Table 12 below.

[0076] Figure 15 Optical diagrams of the optical zoom imaging lens of Embodiment 1 are shown, including, for example, on-axis chromatic aberration curves showing the deviation of the focal point after light of different wavelengths passes through the optical zoom imaging lens, astigmatism curves showing the curvature of the meridional and sagittal image planes, distortion curves showing the distortion magnitude values ​​corresponding to different image heights, and magnification chromatic aberration curves showing the deviation of light at different image heights on the imaging plane after passing through the optical zoom imaging lens. Figure 15 As can be seen, the optical zoom imaging lens of Example 1 has good control over on-axis chromatic aberration, astigmatism, distortion, and magnification chromatic aberration, and the optical zoom imaging lens given in Example 1 can achieve good imaging quality.

[0077] Example 2 Figure 16 This diagram shows the structure of the optical zoom imaging lens in its first state according to Embodiment 2-1 of this application. Figure 17 This diagram shows the structure of the optical zoom imaging lens in its second state according to Embodiment 2-1 of this application. Figure 18 This diagram shows the structure of the optical zoom imaging lens in its first state according to Embodiment 2-2 of this application. Figure 19 This diagram shows the structure of the optical zoom imaging lens in its second state according to Embodiment 2-2 of this application. Figure 20 The diagram shows the structure of the optical zoom imaging lens in its first state according to embodiments 2-3 of this application. Figure 21 The diagram shows the structure of the optical zoom imaging lens in the second state of Embodiments 2-3 of this application.

[0078] like Figures 16 to 21 As shown, the optical zoom imaging lens includes a first optical element group, a second optical element group, and a third optical element group.

[0079] The first optical element group includes, along the optical axis from the object side to the image side, a first lens E1, a prism P, and a second lens E2, wherein the image-side surface S2 of the first lens E1 is cemented with the incident surface of the prism P, and the object-side surface S3 of the second lens E2 is cemented with the exit surface of the prism P; the second optical element group includes a first lens barrel, within which, along the optical axis from the object side to the image side, a third lens E3, a third spacer element (not shown in the figure), a fourth lens E4, a fifth lens E5, and a sixth lens E6, wherein the third spacer element is at least partially in contact with the third lens E3; the third optical element group includes a second lens barrel, within which, along the optical axis from the object side to the image side, a seventh lens E7, an eighth lens E8, and a ninth lens E9, are sequentially included.

[0080] Table 4 below shows the basic structural parameters of the optical zoom imaging lens of Embodiment 2 under Embodiments 2-1, 2-2, and 2-3. The units for radius of curvature and center thickness / spacing are millimeters (mm). In Table 4, OBJ (not shown in the figure) is the object plane, and STO (not shown in the figure) is the aperture stop.

[0081] Table 4

[0082] As shown in Table 4, in Embodiment 2, the object-side surface S1 of the first lens E1, the image-side surface S4 of the second lens E2, and the object-side and image-side surfaces of the third lens E3 to the ninth lens E9 are all aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the aforementioned formula (1). Tables 5-1 and 5-2 below give the higher-order coefficients A4, A6...A26 that can be used for each aspherical mirror in Embodiment 2.

[0083] Table 5-1

[0084] Table 5-2

[0085] In Embodiment 2, the second optical element group can move along the optical axis to change the focal length state of the optical zoom lens, specifically including a first state (telephoto state) and a second state (macro state). The object distance and the spacing between the lens groups change accordingly in different states as shown in Table 6 below, where f is the total focal length of the system, fno is the aperture number, D1 is the object distance, D2 is the spacing between the object-side surface of the third lens and the image-side surface of the second lens, and D3 is the spacing between the object-side surface of the seventh lens and the image-side surface of the sixth lens.

[0086] Table 6

[0087] Furthermore, in Embodiment 2, the first lens E1, prism P, and the second lens E2 constitute the first lens group, which has positive optical power; the third lens E3, the fourth lens E4, the fifth lens E5, and the sixth lens E6 constitute the second lens group, which has positive optical power; and the seventh lens E7, the eighth lens E8, and the ninth lens E9 constitute the third lens group, which has negative optical power. The optical parameters of the optical zoom imaging lens of Embodiment 2 under Embodiments 2-1, 2-2, and 2-3 are shown in Table 10 below (unit: mm), the structural parameters are shown in Table 11 below (unit: mm), and the values ​​of each conditional expression are shown in Table 12 below.

[0088] Figure 22 The diagram shows an optical profile of the optical zoom imaging lens of Embodiment 2. For example, it shows on-axis chromatic aberration curves indicating the deviation of the focal point after light of different wavelengths passes through the optical zoom imaging lens; astigmatism curves indicating the curvature of the meridional and sagittal image planes; distortion curves indicating the magnitude of distortion corresponding to different image heights; and magnification chromatic aberration curves indicating the deviation of light at different image heights on the imaging plane after passing through the optical zoom imaging lens. Figure 22 As can be seen, the optical zoom imaging lens of Embodiment 2 has good control over on-axis chromatic aberration, astigmatism, distortion, and magnification chromatic aberration, and the optical zoom imaging lens given in Embodiment 2 can achieve good imaging quality.

[0089] Example 3 Figure 23 This diagram shows the structure of the optical zoom imaging lens in its first state according to Embodiment 3-1 of this application. Figure 24 This diagram shows the structure of the optical zoom imaging lens in its second state according to Embodiment 3-1 of this application. Figure 25 This diagram shows the structure of the optical zoom imaging lens in its first state according to Embodiment 3-2 of this application. Figure 26 This diagram illustrates the structure of the optical zoom imaging lens in its second state according to Embodiment 3-2 of this application. Figure 27 This shows a schematic diagram of the optical zoom imaging lens in its first state according to Embodiment 3-3 of this application. Figure 28 A schematic diagram of the structure of the optical zoom imaging lens in the second state of Embodiment 3-3 of this application is shown.

[0090] like Figures 23 to 28 As shown, the optical zoom imaging lens includes a first optical element group, a second optical element group, and a third optical element group.

[0091] The first optical element group includes, along the optical axis from the object side to the image side, a first lens E1, a prism P, and a second lens E2, wherein the image-side surface S2 of the first lens E1 is cemented with the incident surface of the prism P, and the object-side surface S3 of the second lens E2 is cemented with the exit surface of the prism P; the second optical element group includes a first lens barrel, within which, along the optical axis from the object side to the image side, a third lens E3, a third spacer element (not shown in the figure), a fourth lens E4, a fifth lens E5, and a sixth lens E6, wherein the third spacer element is at least partially in contact with the third lens E3; the third optical element group includes a second lens barrel, within which, along the optical axis from the object side to the image side, a seventh lens E7, an eighth lens E8, and a ninth lens E9, are sequentially included.

[0092] Table 7 below shows the basic structural parameters of the optical zoom imaging lens of Embodiment 3 under Embodiments 3-1, 3-2, and 3-3. The units for radius of curvature and center thickness / spacing are millimeters (mm). In Table 7, OBJ (not shown in the figure) is the object plane, and STO (not shown in the figure) is the aperture stop.

[0093] Table 7

[0094] As shown in Table 7, in Embodiment 3, the object-side surface S1 of the first lens E1, the image-side surface S4 of the second lens E2, and the object-side and image-side surfaces of the third lens E3 to the ninth lens E9 are all aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the aforementioned formula (1). Tables 8-1 and 8-2 below give the higher-order coefficients A4, A6...A30 that can be used for each aspherical mirror in Embodiment 3.

[0095] Table 8-1

[0096] Table 8-2

[0097] In Embodiment 3, the second optical element group can move along the optical axis to change the focal length state of the optical zoom lens, specifically including a first state (telephoto state) and a second state (macro state). The object distance and the spacing between the lens groups change accordingly in different states as shown in Table 9 below, where f is the total focal length of the system, fno is the aperture number, D1 is the object distance, D2 is the spacing between the object-side surface of the third lens and the image-side surface of the second lens, and D3 is the spacing between the object-side surface of the seventh lens and the image-side surface of the sixth lens.

[0098] Table 9

[0099] Furthermore, in Embodiment 3, the first lens E1, prism P, and the second lens E2 constitute the first lens group, which has positive optical power; the third lens E3, the fourth lens E4, the fifth lens E5, and the sixth lens E6 constitute the second lens group, which has positive optical power; and the seventh lens E7, the eighth lens E8, and the ninth lens E9 constitute the third lens group, which has negative optical power. The optical parameters of the optical zoom imaging lens of Embodiment 3 under Embodiments 3-1, 3-2, and 3-3 are shown in Table 10 below (unit: mm), the structural parameters are shown in Table 11 below (unit: mm), and the values ​​of each conditional expression are shown in Table 12 below.

[0100] Figure 29 The diagram shows an optical profile of the optical zoom imaging lens of Embodiment 3. For example, it shows on-axis chromatic aberration curves indicating the deviation of the focal point after light of different wavelengths passes through the optical zoom imaging lens; astigmatism curves indicating the curvature of the meridional and sagittal image planes; distortion curves indicating the magnitude of distortion corresponding to different image heights; and magnification chromatic aberration curves indicating the deviation of light at different image heights on the imaging plane after passing through the optical zoom imaging lens. Figure 29 As can be seen, the optical zoom imaging lens of Embodiment 3 has good control over on-axis chromatic aberration, astigmatism, distortion, and magnification chromatic aberration, and the optical zoom imaging lens given in Embodiment 3 can achieve good imaging quality.

[0101] In summary, some optical parameters of the optical zoom imaging lenses of Examples 1-1 to 3-3 are shown in Table 10 below, and the unit of each optical parameter is millimeters (mm).

[0102] Table 10

[0103] The structural parameters of some optical zoom imaging lenses in Examples 1-1 to 3-3 are shown in Table 11 below, in millimeters (mm).

[0104] Table 11

[0105] The conditions satisfied by the optical zoom imaging lenses of Examples 1-1 to 3-3 are shown in Table 12 below.

[0106] Table 12

[0107] This application also provides an imaging lens, whose electronic photosensitive element can be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging lens can be a stand-alone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. This imaging lens is equipped with the optical zoom imaging lens described above.

[0108] It should be understood that the structure or architecture described above is merely exemplary, and the implementation methods and entities of this application are not limited thereto, but can be modified without departing from the spirit of this application. It is understood that the description of the various embodiments in this disclosure emphasizes the differences between the various embodiments, and their similarities or corresponding parts can be referred to mutually. For the purpose of brevity, this disclosure will not elaborate on each one.

[0109] While numerous embodiments of this application have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will arise for those skilled in the art without departing from the spirit and intent of this application. It should be understood that various alternatives to the embodiments of this application described herein may be employed in the practice of this application. The appended claims are intended to define the scope of protection of this application and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. An optical zoom imaging lens, characterized in that, It includes a first optical element group, a second optical element group, and a third optical element group, wherein the second optical element group is movable along the optical axis; The first optical element group includes a first lens, a prism, and a second lens in sequence along the optical axis from the object side to the image side. The image side of the first lens is cemented to the incident surface of the prism, and the object side of the second lens is cemented to the exit surface of the prism. The second optical element group includes a first lens barrel, and the first lens barrel includes a third lens, a third spacer element, a fourth lens, a fifth lens and a sixth lens in sequence along the optical axis from the object side to the image side, wherein the third spacer element is at least partially in contact with the third lens; The third optical element group includes a second lens barrel, and the second lens barrel includes a seventh lens, an eighth lens, and a ninth lens in sequence along the optical axis from the object side to the image side. The first lens, the prism, and the second lens constitute a first lens group, wherein the first lens has positive optical power and the first lens group has positive optical power; the third lens, the fourth lens, the fifth lens, and the sixth lens constitute a second lens group, wherein the second lens group has positive optical power; the seventh lens, the eighth lens, and the ninth lens constitute a third lens group, wherein the ninth lens has negative optical power and the third lens group has negative optical power. The combined focal length f12 of the first lens group, the effective focal length f3 of the third lens, and the inner diameter d3s of the plane perpendicular to the optical axis of the object side of the third spacer element satisfy the following: 1.52≤f12 / f3≤4.78; 1.82≤f3 / d3s≤5.

51.

2. The optical zoom imaging lens according to claim 1, characterized in that, The radius of curvature R7 of the object side of the fourth lens and the inner diameter d3m of the plane perpendicular to the optical axis of the image side of the third spacer element satisfy the following condition: 0.75≤R7 / d3m≤1.

10.

3. The optical zoom imaging lens according to claim 1, characterized in that, A fourth spacer element is provided between the fourth lens and the fifth lens, and the fourth spacer element is at least partially in contact with the fourth lens; The inner diameter d4s of the object side of the fourth spacer element perpendicular to the optical axis and the radius of curvature R8 of the image side of the fourth lens satisfy the following: 1.38≤d4s / R8≤1.

88.

4. The optical zoom imaging lens according to claim 3, characterized in that, The image-side surface of the third spacer element and the object-side surface of the fourth spacer element are spaced EP34 along the optical axis. The air gap T34 between the third lens and the fourth lens on the optical axis satisfies: 8.28≤EP34 / T34≤23.

19.

5. The optical zoom imaging lens according to claim 1, characterized in that, A seventh spacer element is provided between the seventh lens and the eighth lens, and the seventh spacer element is at least partially in contact with the seventh lens; The inner diameter d7s of the plane perpendicular to the optical axis of the object side of the seventh spacer element, and the air gap T78 between the seventh lens and the eighth lens on the optical axis satisfy: 4.75≤d7s / T78≤7.

73.

6. The optical zoom imaging lens according to claim 5, characterized in that, The distance EPb7 between the object side surface of the second lens barrel and the object side surface of the seventh spacer element along the optical axis, and the center thickness CT7 of the seventh lens on the optical axis, satisfy the following: 1.91≤EPb7 / CT7≤2.

86.

7. The optical zoom imaging lens according to claim 1, characterized in that, An eighth spacer element is provided between the eighth lens and the ninth lens, and the eighth spacer element is at least partially in contact with the eighth lens; The outer diameter D8s of the plane perpendicular to the optical axis of the object side of the eighth spacer element, and the air gap T89 between the eighth lens and the ninth lens on the optical axis satisfy: 5.95≤D8s / T89≤23.

54.

8. The optical zoom imaging lens according to claim 3, characterized in that, A fifth spacer element is provided between the fifth lens and the sixth lens, and the fifth spacer element is at least partially in contact with the fifth lens; The spacing between the image side of the third spacer element and the object side of the fourth spacer element along the optical axis is EP34, the spacing between the image side of the fourth spacer element and the object side of the fifth spacer element along the optical axis is EP45, and the distance Tr8r11 on the optical axis from the image side of the fourth lens to the object side of the sixth lens satisfies the following condition: 0.97≤(EP34+EP45) / Tr8r11≤1.

53.

9. The optical zoom imaging lens according to claim 1, characterized in that, The central thickness CT3 of the third lens on the optical axis, the inner diameter of the object side of the third spacer perpendicular to the optical axis, and the outer diameter D3s of the object side of the third spacer perpendicular to the optical axis satisfy the following condition: 0.59≤CT3 / (D3s-d3s)≤0.

82.

10. The optical zoom imaging lens according to claim 1, characterized in that, The maximum horizontal distance La from the object side to the image side of the first lens barrel along the optical axis, the center thickness CT3 of the third lens on the optical axis, the center thickness CT4 of the fourth lens 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 the following condition: 1.14≤La / (CT3+CT4+CT5+CT6)≤1.

29.

11. The optical zoom imaging lens according to claim 1, characterized in that, The maximum horizontal distance Lb from the object side to the image side of the second lens tube along the optical axis, the air gap T78 between the seventh lens and the eighth lens on the optical axis, and the air gap T89 between the eighth lens and the ninth lens on the optical axis satisfy the following condition: 2.26≤Lb / (T78+T89)≤3.

06.

12. The optical zoom imaging lens according to claim 5, characterized in that, The effective focal length f7 of the seventh lens and the outer diameter D7s of the object side of the seventh spacer element perpendicular to the optical axis satisfy the following condition: -3.99≤f7 / D7s≤8.

39.

13. The optical zoom imaging lens according to claim 7, characterized in that, The effective focal length f9 of the ninth lens and the inner diameter d8m of the plane perpendicular to the optical axis of the image side of the eighth spacer element satisfy the following condition: -4.07≤f9 / d8m≤2.

56.

14. The optical zoom imaging lens according to claim 1, characterized in that, The combined focal length of the second lens group is f789, and the inner diameter dbs of the object side of the second lens tube perpendicular to the optical axis satisfies: -3.33≤f789 / dbs≤-2.

63.

15. The optical zoom imaging lens according to claim 1, characterized in that, Both the first lens and the second lens are non-circular lenses. The first lens has a first and a second symmetrically arranged parallel cut edges, and the second lens has a third and a fourth symmetrically arranged parallel cut edges. The first lens has a first screen printing layer and a second screen printing layer on its object-side effective diameter near the first and second chopped edges, and the second lens has a third screen printing layer and a fourth screen printing layer on its image-side effective diameter near the third and fourth chopped edges. The first, second, third, and fourth silkscreen layers are all wavy and satisfy the following conditions: 3.85 < a1 / b1 < 5.30, 0.85 ≤ H1 / D1 < 0.90, 4.10 < a2 / b2 < 6.05, 0.80 < H2 / D2 < 0.90, where a1 is the horizontal distance between adjacent peaks of the first or second silkscreen layer, a2 is the horizontal distance between adjacent peaks of the third or fourth silkscreen layer, and b1 is the distance between the peaks and troughs of the first or second silkscreen layer. The vertical height difference is given by: b2 being the vertical height difference between the peaks and troughs of the third or fourth silkscreen layer; H1 being the horizontal distance from the trough of the first or second silkscreen layer to the center of the first lens; H2 being the horizontal distance from the trough of the third or fourth silkscreen layer to the center of the second lens; D1 being the horizontal distance from the edge of the first or second cut edge to the center of the first lens; and D2 being the horizontal distance from the edge of the third or fourth cut edge to the center of the second lens.

Images