Mobile zoom optical system

Abstract

The application provides a mobile zoom optical system, which comprises a first lens barrel and a second lens barrel in sequence from an object side to an image side along an optical axis, wherein the first lens barrel is a fixed component, the second lens barrel is a mobile component, the first lens barrel contains a first lens group and a plurality of spacer elements, the first lens group comprises a first lens, a second lens, a third lens and a fourth lens, the plurality of spacer elements comprises a first spacer element, a second spacer element and a third spacer element, the second lens barrel contains a second lens group, the second lens group comprises a fifth lens, and the mobile zoom optical system further satisfies: 2.55 <= deltaT / CT5 < 2.95; and 0.15 <= L2 / (D02m-d02m) <= 0.45.

Description

Technical Field

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

[0002] As mobile phone imaging capabilities have become a core competitive advantage, users' demands for telephoto shooting have evolved from simply "being able to shoot far" to a three-dimensional requirement of "clear images, slim body, and agile zoom." Clustered telephoto zoom lenses have emerged in response to this need. However, the internal space of a mobile phone is limited. To further meet the zoom range requirements, a range of motion is typically reserved for the moving group. The minimum value of this range (i.e., the minimum distance between the moving group and the fixed group) corresponds to the telephoto limit of the phone. The size of the lens barrel in the moving group along the direction perpendicular to the optical axis is compressed. Since the moving lens barrel has a certain height along the optical axis, its range of motion cannot reach its minimum within the limited internal space of the phone, affecting the realization of the phone's telephoto function. Forcibly shortening the maximum height of the moving lens barrel would reduce its structural strength, making it prone to deformation during assembly. This would cause the sliding direction of the moving group to shift relative to the optical axis, affecting the zoom function in mobile phone imaging.

[0003] In order to ensure optical zoom while meeting the lens assembly requirements, the lens optical design of the moving component is often limited in the moving zoom optical system. Stress concentration problems are prone to occur during reliability verification, resulting in poor assembly stability. Summary of the Invention

[0004] One advantage of this application is that it provides a mobile zoom optical system that, while meeting existing optical requirements and manufacturing capabilities, reduces lens height, improves zoom accuracy to achieve high-magnification precision zoom, and meets the design requirements of ultra-thin design.

[0005] A movable zoom optical system provided by the present application sequentially includes a first lens barrel and a second lens barrel from the object side to the image side along the optical axis direction; wherein the first lens barrel is a fixed component, and the second lens barrel is a movable component; the first lens barrel contains a first lens group and a plurality of spacing elements, the number of lenses with optical power in the first lens group is four, and the first lens group comprises: a first lens with positive optical power, the object side of the first lens being a convex surface, a second lens with positive optical power, the object side of the second lens being a convex surface, a third lens with negative optical power, the object side of the third lens being a concave surface, and a fourth lens with positive optical power, the image side of the fourth lens being a convex surface; the plurality of spacing elements comprise: a first spacing element, arranged between the image side of the first lens and the second lens and at least partially in contact with the image side of the first lens; a second spacing element, arranged between the image side of the second lens and the third lens and at least partially in contact with the image side of the second lens; a third spacing element, arranged between the image side of the third lens and the fourth lens and at least partially in contact with the image side of the third lens; the second lens barrel contains a second lens group, the number of lenses with optical power in the second lens group is one, and the second lens group comprises: a fifth lens with negative optical power, the object side of the fifth lens being a concave surface, and the image side of the fifth lens being a convex surface; and the following conditions are satisfied: 2.55≤ΔT / CT5<2.95; 0.15<L2 / (D02m-d02m)≤0.45; where ΔT is the maximum movable distance of the second lens barrel along the optical axis direction when the movable zoom optical system changes from a state where the object distance is infinity to a state where the object distance is 120mm, CT5 is the central thickness of the fifth lens, L2 is the maximum height of the second lens barrel, D02m is the outer diameter of the plane perpendicular to the optical axis on the image side of the second lens barrel, and d02m is the inner diameter of the plane perpendicular to the optical axis on the image side of the second lens barrel.

[0006] In some embodiments, the movable zoom optical system further satisfies: 3.40<L2 / |SAG51|<10.00; where L2 is the maximum height of the second lens barrel, and SAG51 is the on-axis displacement between the intersection point of the object side of the fifth lens and the optical axis and the vertex of the effective radius of the optically effective area on the object side of the fifth lens.

[0007] In some embodiments, the movable zoom optical system further satisfies: 2.90≤fa / (L1+L2)<3.30, 2.75<fb / (L1+L2)<3.15; where fa is the effective focal length of the movable zoom optical system when the object distance is infinity, fb is the effective focal length of the movable zoom optical system when the object distance is 120mm, L1 is the maximum height of the first lens barrel, and L2 is the maximum height of the second lens barrel.

[0008] In some of the embodiments, the mobile zoom optical system further satisfies: 3.35<F1 / (EP01+EP12+EP23)<4.15; where F1 is the effective focal length of the first lens group, EP01 is the separation distance along the optical axis direction between the object side surface of the first lens barrel and the object side surface of the first spacing element, EP12 is the separation distance along the optical axis direction between the image side surface of the first spacing element and the object side surface of the second spacing element, and EP23 is the separation distance along the optical axis direction between the image side surface of the second spacing element and the object side surface of the third spacing element.

[0009] In some of the embodiments, the mobile zoom optical system further satisfies: -4.85<F2 / d02s<-4.05; where F2 is the effective focal length of the second lens group, and d02s is the inner diameter of the plane perpendicular to the optical axis on the object side surface of the second lens barrel.

[0010] In some of the embodiments, the mobile zoom optical system further comprises a cap, the cap is annular, the central axis of the ring of the cap is arranged coaxially with the optical axis, the cap has an object side surface facing the object side and an image side surface facing the image side, the cap is disposed on the object side surface of the first lens barrel; and satisfies: 1.95<d03s / DT11<2.20; where d03s is the inner diameter of the plane perpendicular to the optical axis on the object side surface of the cap, and DT11 is the maximum radius of the optically effective area of the object side surface of the first lens.

[0011] In some of the embodiments, the mobile zoom optical system further comprises a cap, the cap is annular, the central axis of the ring of the cap is arranged coaxially with the optical axis, the cap has an object side surface facing the object side and an image side surface facing the image side, and the cap is disposed on the object side surface of the first lens barrel; the mobile zoom optical system further satisfies: 1.00<d01s / D03m<1.05; where d01s is the inner diameter of the plane perpendicular to the optical axis on the object side surface of the first lens barrel, and D03m is the outer diameter of the plane perpendicular to the optical axis on the image side surface of the cap.

[0012] In some of the embodiments, the mobile zoom optical system further satisfies: 0.30≤(DT11-DT42) / (d01s-d01m)<1.25; where DT11 is the maximum radius of the optically effective area of the object side surface of the first lens, DT42 is the maximum radius of the optically effective area of the image side surface of the fourth lens, d01s is the inner diameter of the plane perpendicular to the optical axis on the object side surface of the first lens barrel, and d01m is the inner diameter of the plane perpendicular to the optical axis on the image side surface of the first lens barrel.

[0013] In some embodiments, the movable zoom optical system further satisfies: -0.20<(D02s-d02s) / R9<0.00; where D02s is the outer diameter of the plane perpendicular to the optical axis on the object side of the second lens barrel, d02s is the inner diameter of the plane perpendicular to the optical axis on the object side of the second lens barrel, and R9 is the radius of curvature of the object side of the fifth lens.

[0014] In some embodiments, the movable zoom optical system further satisfies: 0.10<SAG11 / L1<0.20, -0.15<SAG42 / L1<-0.05; where SAG11 is the on-axis displacement between the intersection point of the object side of the first lens and the optical axis and the vertex of the effective radius of the optically effective region on the object side of the first lens, SAG42 is the on-axis displacement between the intersection point of the image side of the fourth lens and the optical axis and the vertex of the effective radius of the optically effective region on the image side of the fourth lens, and L1 is the maximum height of the first lens barrel.

[0015] In some embodiments, the movable zoom optical system further satisfies: -0.45<F1 / F2≤-0.40, 0.00<|d02s-d01m| / ΔT<1.85; where F1 is the effective focal length of the first lens group, F2 is the effective focal length of the second lens group, d02s is the inner diameter of the plane perpendicular to the optical axis on the object side of the second lens barrel, d01m is the inner diameter of the plane perpendicular to the optical axis on the image side of the first lens barrel, and ΔT is the maximum movable distance of the second lens barrel along the optical axis direction when the movable zoom optical system changes from a state with an object distance of infinity to a state with an object distance of 120mm.

[0016] In some embodiments, the movable zoom optical system further satisfies: 0.90<d02m / (fa×tan(FOVa / 2))<1.35; where d02m is the inner diameter of the plane perpendicular to the optical axis on the image side of the second lens barrel, fa is the effective focal length of the movable zoom optical system when the object distance is at infinity, and FOVa is the maximum field angle of the movable zoom optical system when the object distance is at infinity.

[0017] In some embodiments, the movable zoom optical system further satisfies: 2.00<D01s / Tr1r8<2.10, 18.50<D02m / CT5≤24.75; where D01s is the outer diameter of the plane perpendicular to the optical axis on the object side of the first lens barrel, D02m is the outer diameter of the plane perpendicular to the optical axis on the image side of the second lens barrel, Tr1r8 is the separation distance along the optical axis direction from the object side of the first lens to the image side of the fourth lens, and CT5 is the central thickness of the fifth lens.

[0018] In summary, in the mobile zoom optical system of the present application, the optical powers of the first lens to the fifth lens are distributed according to the "positive-positive-negative-positive-negative" configuration, the object-side surfaces of the first lens and the second lens are both convex, the object-side surfaces of the third lens and the fifth lens are concave, the image-side surfaces of the fourth lens and the fifth lens are convex, and the conditional expression 2.55≤ΔT / CT5<2.95 is satisfied. The zooming purpose of the optical system is achieved by moving the second lens barrel. However, at this time, the designed size of the second lens barrel as a moving component is relatively small, and the problem of excessive stress concentration is prone to occur in the moving component during the assembly process and the reliability verification process, resulting in poor assembly stability. Therefore, the present application restricts the shape of the second lens barrel through the conditional expression 0.15<L2 / (D02m-d02m)≤0.45, reasonably matches the axial length and the radial wall thickness of the second lens barrel, ensures the rationality of the structural size of the second lens barrel, optimizes the stress distribution, prevents stress from being concentrated at local positions, and is beneficial to maintaining the structural stability of the moving component. Brief Description of the Drawings

[0019] Figure 1A is a schematic structural diagram of the mobile zoom optical system according to an embodiment of the present application when the object distance is at infinity.

[0020] Figure 1B is a schematic structural diagram of the mobile zoom optical system according to an embodiment of the present application when the object distance is 120 mm.

[0021] Figure 2 is Figure 1A a schematic diagram of partial parameters of the lens group in the illustrated mobile zoom optical system.

[0022] Figure 3 is Figure 1A a schematic diagram of another part of parameters of the lens group in the illustrated mobile zoom optical system.

[0023] Figure 4A is a schematic structural diagram of the mobile zoom optical system according to Embodiment 1 of the present application when the object distance is at infinity.

[0024] Figure 4B is a schematic structural diagram of the mobile zoom optical system according to Embodiment 1 of the present application when the object distance is 120 mm.

[0025] Figure 5A is a schematic structural diagram of the mobile zoom optical system according to Embodiment 2 of the present application when the object distance is at infinity.

[0026] Figure 5B is a schematic structural diagram of the mobile zoom optical system according to Embodiment 2 of the present application when the object distance is 120 mm.

[0027] Figure 6AThis is a schematic diagram of the moving zoom optical system according to Embodiment 3 of this application when the object distance is infinite.

[0028] Figure 6B This is a schematic diagram of the moving zoom optical system according to Embodiment 3 of this application at an object distance of 120mm.

[0029] Figure 7A The diagram shows the on-axis chromatic aberration curves of the moving zoom optical system according to Embodiment 1, Embodiment 2 and Embodiment 3 of this application when the object distance is infinite.

[0030] Figure 7B The diagram shows the astigmatism curves of the moving zoom optical system according to the above-described embodiments one, two, and three of this application when the object distance is infinite.

[0031] Figure 7C The diagram shows the distortion curves of the moving zoom optical system according to Embodiment 1, Embodiment 2 and Embodiment 3 of this application when the object distance is infinite.

[0032] Figure 8A A schematic diagram of the on-axis chromatic aberration curves of the moving zoom optical system according to Embodiment 1, Embodiment 2 and Embodiment 3 of this application at an object distance of 120mm is shown.

[0033] Figure 8B A schematic diagram of the astigmatism curves of the moving zoom optical system according to Embodiment 1, Embodiment 2 and Embodiment 3 of this application at an object distance of 120mm is shown.

[0034] Figure 8C The diagram shows the distortion curves of the moving zoom optical system according to Embodiment 1, Embodiment 2 and Embodiment 3 of this application at an object distance of 120mm.

[0035] Figure 9A This is a schematic diagram of the moving zoom optical system according to Embodiment 4 of this application when the object distance is infinite.

[0036] Figure 9B This is a schematic diagram of the moving zoom optical system according to Embodiment 4 of this application at an object distance of 120mm.

[0037] Figure 10A This is a schematic diagram of the moving zoom optical system according to Embodiment 5 of this application when the object distance is infinite.

[0038] Figure 10BThis is a schematic diagram of the moving zoom optical system according to Embodiment 5 of this application at an object distance of 120mm.

[0039] Figure 11A This is a schematic diagram of the moving zoom optical system according to Embodiment Six of this application when the object distance is infinite.

[0040] Figure 11B This is a schematic diagram of the moving zoom optical system according to Embodiment Six of this application at an object distance of 120mm.

[0041] Figure 12A The diagram shows the on-axis chromatic aberration curves of the moving zoom optical system according to Embodiments 4, 5 and 6 of this application when the object distance is infinite.

[0042] Figure 12B The diagram shows the astigmatism curves of the moving zoom optical system according to Embodiments 4, 5 and 6 of this application when the object distance is infinite.

[0043] Figure 12C The diagram shows the distortion curves of the moving zoom optical system according to Embodiments 4, 5 and 6 of this application when the object distance is infinite.

[0044] Figure 13A The diagram shows the on-axis chromatic aberration curves of the moving zoom optical system according to Embodiments 4, 5 and 6 of this application at an object distance of 120 mm.

[0045] Figure 13B A schematic diagram of the astigmatism curves of the moving zoom optical system according to Embodiments 4, 5 and 6 of this application at an object distance of 120mm is shown.

[0046] Figure 13C The diagram shows the distortion curves of the moving zoom optical system according to Embodiments 4, 5 and 6 of this application at an object distance of 120mm.

[0047] Figure 14A This is a schematic diagram of the moving zoom optical system according to Embodiment 7 of this application when the object distance is infinite.

[0048] Figure 14B This is a schematic diagram of the moving zoom optical system according to Embodiment 7 of this application at an object distance of 120mm.

[0049] Figure 15AThis is a schematic diagram of the moving zoom optical system according to Embodiment 8 of this application when the object distance is infinite.

[0050] Figure 15B This is a schematic diagram of the moving zoom optical system according to Embodiment 8 of this application at an object distance of 120mm.

[0051] Figure 16A This is a schematic diagram of the moving zoom optical system according to Embodiment 9 of this application when the object distance is infinite.

[0052] Figure 16B This is a schematic diagram of the moving zoom optical system according to Embodiment 9 of this application at an object distance of 120mm.

[0053] Figure 17A A schematic diagram of the on-axis chromatic aberration curves of the moving zoom optical system according to Embodiments 7, 8 and 9 of this application at an infinity object distance is shown.

[0054] Figure 17B A schematic diagram of the astigmatism curves of the moving zoom optical system according to Embodiments 7, 8 and 9 of this application at an infinity object distance is shown.

[0055] Figure 17C The diagram shows the distortion curves of the moving zoom optical system according to Embodiments 7, 8 and 9 of this application when the object distance is infinite.

[0056] Figure 18A A schematic diagram of the on-axis chromatic aberration curves of the moving zoom optical system according to Embodiments 7, 8 and 9 of this application at an object distance of 120 mm is shown.

[0057] Figure 18B A schematic diagram of the astigmatism curves of the moving zoom optical system according to Embodiments 7, 8 and 9 of this application at an object distance of 120mm is shown.

[0058] Figure 18C A schematic diagram of the distortion curves of the moving zoom optical system according to Embodiments 7, 8 and 9 of this application at an object distance of 120mm is shown.

[0059] Figure 19 The stress diagram at the second lens group of the moving zoom optical system in Example 1, which satisfies ΔT / CT5=2.80 and L2 / (D02m-d02m)=0.22.

[0060] Figure 20The stress diagram of the second lens group is given when the moving zoom optical system satisfies ΔT / CT5=2.80 and L2 / (D02m-d02m)=0.10.

[0061] Figure 21 The stress diagram of the second lens group is given when the moving zoom optical system satisfies ΔT / CT5=2.80 and L2 / (D02m-d02m)=1.33.

[0062] Figure label: E1: First lens; E2: Second lens; E3: Third lens; E4: Fourth lens; E5: Fifth lens; P01: First lens barrel; P02: Second lens barrel; P03: Cap; P1: First spacer element; P2: Second spacer element; P3: Third spacer element; P1b: First auxiliary spacer element; P1c: Second auxiliary spacer element. Detailed Implementation

[0063] 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.

[0064] 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.

[0065] 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.

[0066] In this paper, the paraxial region refers to the area near the optical axis. If the lens surface is convex and its location is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and its location is not defined, it means that the lens surface is concave at least in the paraxial region. The surface shape in the paraxial region is determined by the sign of the R value (R refers to the radius of curvature of the paraxial region). In this paper, the surface of each lens closest to the subject is called the object-side surface, and the surface of each lens closest to the imaging plane is called the image-side surface. For the object-side surface, a positive R value indicates a convex surface, and a negative R value indicates a concave surface; for the image-side surface, a positive R value indicates a concave surface, and a negative R value indicates a convex surface.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] According to one aspect of this application, such as Figure 1A and Figure 1B , Figure 2 , Figure 3As shown, one embodiment of the present application proposes a mobile zoom optical system, which sequentially includes a first lens barrel P01 and a second lens barrel P02 from the object side to the image side along the optical axis direction; wherein, the first lens barrel P01 is a fixed component, and the second lens barrel P02 is a movable component; the first lens barrel P01 contains a first lens group and a plurality of spacing elements, the number of lenses with optical power in the first lens group is four, and the first lens group includes: a first lens E1 with positive optical power, the object side of the first lens E1 is a convex surface, a second lens E2 with positive optical power, the object side of the second lens E2 is a convex surface, a third lens E3 with negative optical power, the object side of the third lens E3 is a concave surface, a fourth lens E4 with positive optical power, and the image side of the fourth lens E4 is a convex surface; the plurality of spacing elements include: a first spacing element P1, disposed between the image side of the first lens E1 and the second lens E2 and at least partially in contact with the image side of the first lens E1; a second spacing element P2, disposed between the image side of the second lens E2 and the third lens E3 and at least partially in contact with the image side of the second lens E2; a third spacing element P3, disposed between the image side of the third lens E3 and the fourth lens E4 and at least partially in contact with the image side of the third lens E3; the second lens barrel P02 contains a second lens group, the number of lenses with optical power in the second lens group is one, and the second lens group includes: a fifth lens E5 with negative optical power, the object side of the fifth lens E5 is a concave surface, and the image side of the fifth lens E5 is a convex surface; and the following conditions are satisfied: 2.55≤ΔT / CT5<2.95; 0.15<L2 / (D02m-d02m)≤0.45; where ΔT is the maximum movable distance of the second lens barrel P02 along the optical axis direction when the mobile zoom optical system changes from the state where the object distance is infinity to the state where the object distance is 120mm, CT5 is the center thickness of the fifth lens E5, L2 is the maximum height of the second lens barrel P02, D02m is the outer diameter of the plane perpendicular to the optical axis on the image side of the second lens barrel P02, and d02m is the inner diameter of the plane perpendicular to the optical axis on the image side of the second lens barrel P02.

[0071] In the above movable zoom optical system, the optical powers of the first to fifth lenses are distributed according to "positive-positive-negative-positive-negative", the object sides of the first lens and the second lens are both set as convex surfaces, the object sides of the third lens and the fifth lens are set as concave surfaces, the image sides of the fourth lens and the fifth lens are set as convex surfaces, and the conditional expression 2.55≤ΔT / CT5<2.95 is satisfied. The zoom purpose of the optical system is achieved by moving the second lens barrel. However, at this time, the designed size of the second lens barrel as a moving component is relatively small, and during the assembly process and the reliability verification process, the moving component is prone to excessive stress concentration, resulting in poor assembly stability. Therefore, the present application restricts the shape of the second lens barrel through the conditional expression 0.15<L2 / (D02m-d02m)≤0.45, reasonably matches the axial length and the radial wall thickness of the second lens barrel, ensures the rationality of the structural size of the second lens barrel, optimizes the force distribution, prevents stress from being concentrated at local positions, and is beneficial to maintaining the structural stability of the moving component.

[0072] Figure 19 is a stress diagram of the second lens group of the movable zoom optical system in the first embodiment, the internal force of the moving component is uniform, and the maximum stress value is 0.9MPa. At this time, the movable zoom optical system satisfies ΔT / CT5=2.80 and L2 / (D02m-d02m)=0.22, which falls within the ranges of 2.55≤ΔT / CT5<2.95 and 0.15<L2 / (D02m-d02m)≤0.45. The bearing length between the fifth lens E5 and the second lens barrel P02 is reasonable, the internal stress distribution of the moving component is reasonable, there is no stress concentration in the fifth lens E5, the assembly stability is good, which is beneficial to ensuring the imaging quality; Figure 20 is a stress diagram of the second lens group when the movable zoom optical system satisfies ΔT / CT5=2.80 and L2 / (D02m-d02m)=0.10. Stress concentration occurs at the image side of the fifth lens E5 and the bearing surface of the second lens barrel P02 in the moving component, the maximum stress value is 3.6MPa, and the forces on the fifth lens and the second lens barrel are uneven. Meanwhile, the second lens barrel P02 is prone to form a long cantilever structure, which is likely to adversely affect the imaging quality.

[0073] Figure 21 is a stress diagram of the second lens group when the movable zoom optical system satisfies ΔT / CT5=2.80 and L2 / (D02m-d02m)=1.23. Stress concentration occurs in the edge structure region on the object side of the fifth lens E5 in the moving component, the maximum stress value is 6.2MPa, and meanwhile the surface profile of the fifth lens E5 changes, which is likely to adversely affect the imaging quality.

[0074] According to some embodiments of the present application, the mobile zoom optical system further satisfies: 3.40<L2 / |SAG51|<10.00; where L2 is the maximum height of the second lens barrel P02, and SAG51 is the on-axis displacement from the intersection point of the object side surface of the fifth lens E5 and the optical axis to the vertex of the effective radius of the optically effective area of the object side surface of the fifth lens E5.

[0075] By controlling the range of L2 / |SAG51|, the curved surface morphology of the object side surface of the fifth lens and the height of the second lens barrel are kept moderate, which avoids difficulties in grinding, polishing and inspection caused by an excessively steep curved surface, and prevents machining deformation caused by an excessively high height of the second lens barrel, thereby significantly improving the manufacturability of the lens and the lens barrel, reducing manufacturing difficulty, and increasing the mass production yield.

[0076] According to some embodiments of the present application, the mobile zoom optical system further satisfies: 2.90≤fa / (L1+L2)<3.30, 2.75<fb / (L1+L2)<3.15; where fa is the effective focal length of the mobile zoom optical system when the object distance is at infinity, fb is the effective focal length of the mobile zoom optical system when the object distance is 120mm, L1 is the maximum height of the first lens barrel P01, and L2 is the maximum height of the second lens barrel P02.

[0077] By controlling the ranges of fa / (L1+L2) and fb / (L1+L2), the ratio of the effective focal length to the total height of the lens barrel is reasonably constrained under the two working states of the optical system for infinity imaging and close-range 120mm imaging, which can avoid the accumulation of light propagation angle deviation caused by the extension of the optical path and the resulting increase in geometric aberration, and can also avoid the situation where the optical elements need to adopt excessive optical power to realize light deflection due to insufficient optical path length, resulting in a significant increase in spherical aberration and chromatic aberration. Therefore, reasonably controlling the above ratios is helpful to optimize aberration correction when the optical system changes from the state where the object distance is infinity to the state where the object distance is 120mm, and reduce distortion and blurriness.

[0078] According to some embodiments of the present application, the mobile zoom optical system further satisfies: 3.35<F1 / (EP01+EP12+EP23)<4.15; where F1 is the effective focal length of the first lens group, EP01 is the separation distance along the optical axis direction between the object side surface of the first lens barrel P01 and the object side surface of the first spacing element P1, EP12 is the separation distance along the optical axis direction between the image side surface of the first spacing element P1 and the object side surface of the second spacing element P2, and EP23 is the separation distance along the optical axis direction between the image side surface of the second spacing element P2 and the object side surface of the third spacing element P3.

[0079] By controlling the range of F1 / (EP01+EP12+EP23), the internal space utilization rate of the first lens barrel can be optimized, so that the first lens, the second lens, the third lens and the fourth lens maintain relatively compact lens spacing, which ensures the telephoto capability of the optical system, avoids an excessively long structure of the first lens barrel, and can effectively suppress the coma problem that easily occurs in telephoto lenses.

[0080] According to some embodiments of the present application, the mobile zoom optical system further satisfies: -4.85<F2 / d02s<-4.05; wherein F2 is the effective focal length of the second lens group, and d02s is the inner diameter of the plane perpendicular to the optical axis on the object side of the second lens barrel P02.

[0081] By controlling the range of F2 / d02s, the amount of light entering the second lens group per unit time can be controlled, which can greatly increase the shutter speed under low light conditions, solve the "motion blur" problem under low light, and greatly improve the image clarity of the picture.

[0082] According to some embodiments of the present application, the mobile zoom optical system further includes a cap P03, the cap P03 is annular, the central axis of the ring of the cap P03 is arranged coaxially with the optical axis, the cap P03 has an object side facing the object side and an image side facing the image side, the cap P03 is disposed on the object side of the first lens barrel P01 and abuts against the first lens barrel P01; and satisfies: 1.95<d03s / DT11<2.20; wherein d03s is the inner diameter of the plane perpendicular to the optical axis on the object side of the cap P03, and DT11 is the maximum radius of the optically effective area on the object side of the first lens E1.

[0083] By controlling the range of d03s / DT11, the incident angle of light entering the optical system can be controlled, and the effective utilization rate of light can be improved. At the same time, it can avoid excessive aperture of the first lens and increase of the volume and weight of the lens caused by design redundancy, which helps to balance the optical utilization rate and structural cost.

[0084] According to some embodiments of the present application, the mobile zoom optical system further includes a cap P03, and the cap P03 is located on the object side of the first lens barrel P01; the mobile zoom optical system further satisfies: 1.00<d01s / D03m<1.05; wherein d01s is the inner diameter of the plane perpendicular to the optical axis on the object side of the first lens barrel P01, and D03m is the outer diameter of the plane perpendicular to the optical axis on the image side of the cap P03.

[0085] By controlling the range of d01s / D03m, the inner diameter of the object side of the first lens barrel is slightly larger than the outer diameter of the image side of the cap, which can use the inner diameter of the first lens barrel to position the cap during dispensing, and effectively improve the eccentricity problem caused by dispensing between the cap and the first lens barrel.

[0086] According to some embodiments of the present application, the movable zoom optical system further satisfies: 0.30≤(DT11-DT42) / (d01s-d01m)<1.25; where DT11 is the maximum radius of the optically effective area of the object-side surface of the first lens E1, DT42 is the maximum radius of the optically effective area of the image-side surface of the fourth lens E4, d01s is the inner diameter of the plane perpendicular to the optical axis on the object side of the first lens barrel P01, and d01m is the inner diameter of the plane perpendicular to the optical axis on the image side of the first lens barrel P01.

[0087] By controlling the range of (DT11-DT42) / (d01s-d01m), stable propagation of the light beam among the first lens, the second lens, the third lens and the fourth lens can be ensured, so that light rays exit the first lens group and enter the second lens group at appropriate angles and positions, preventing disordered diffusion of light rays and focusing deviation.

[0088] According to some embodiments of the present application, the movable zoom optical system further satisfies: -0.20<(D02s-d02s) / R9<0.00; where D02s is the outer diameter of the plane perpendicular to the optical axis on the object side of the second lens barrel P02, d02s is the inner diameter of the plane perpendicular to the optical axis on the object side of the second lens barrel P02, and R9 is the radius of curvature of the object-side surface of the fifth lens E5.

[0089] By controlling the range of (D02s-d02s) / R9, the radial wall thickness of the object side of the second lens barrel can be effectively constrained to match the curved surface radius of the object-side surface of the fifth lens, which can effectively suppress internal reflected stray light and ghost images between the second lens barrel and the fifth lens, and effectively suppress the generation of stray light and improve imaging quality on the premise of ensuring the luminous flux of the second lens group.

[0090] According to some embodiments of the present application, the movable zoom optical system further satisfies: 0.10<SAG11 / L1<0.20, -0.15<SAG42 / L1<-0.05; where SAG11 is the on-axis displacement from the intersection point of the object-side surface of the first lens E1 and the optical axis to the vertex of the effective radius of the optically effective area of the object-side surface of the first lens E1, SAG42 is the on-axis displacement from the intersection point of the image-side surface of the fourth lens E4 and the optical axis to the vertex of the effective radius of the optically effective area of the image-side surface of the fourth lens E4, and L1 is the maximum height of the first lens barrel P01.

[0091] By controlling the ranges of SAG11 / L1 and SAG42 / L1, the first lens and the fourth lens with different curved surface forms can form complementary adaptation along the optical axis direction, which greatly reduces the overall occupied height of the first lens group along the optical axis, and enables complex optical path regulation and focal length adjustment functions to be realized in the compact space of the first lens barrel.

[0092] According to some embodiments of the present application, the mobile zoom optical system further satisfies: -0.45<F1 / F2≤-0.40, 0.00<|d02s-d01m| / ΔT<1.85; where F1 is the effective focal length of the first lens group, F2 is the effective focal length of the second lens group, d02s is the inner diameter of the plane perpendicular to the optical axis on the object side of the second lens barrel P02, d01m is the inner diameter of the plane perpendicular to the optical axis on the image side of the first lens barrel P01, and ΔT is the maximum movable distance of the second lens barrel P02 along the optical axis direction when the mobile zoom optical system changes from the state where the object distance is infinity to the state where the object distance is 120 mm.

[0093] By controlling the ranges of F1 / F2 and |d02s-d01m| / ΔT, during the zoom process, the positive and negative refractive powers of the first lens group and the second lens group can complement each other, while ensuring that the inner diameter of the image side of the first lens barrel matches the inner diameter of the object side of the second lens barrel, which effectively avoids a large radial step difference between the two lens barrels. On this basis, it can be ensured that the optical assemblies (the first and second lens groups) are smoothly assembled into the corresponding lens barrels, the complementary effect of the refractive powers is fully exerted, the optical performance failure caused by mechanical assembly deviation is prevented, and finally the adaptation and coordination between the optical performance and the mechanical structure in the entire mobile zoom optical system is realized.

[0094] According to some embodiments of the present application, the mobile zoom optical system further satisfies: 0.90<d02m / (fa×tan(FOVa / 2))<1.35; where d02m is the inner diameter of the plane perpendicular to the optical axis on the image side of the second lens barrel P02, fa is the effective focal length of the mobile zoom optical system when the object distance is in the infinity state, and FOVa is the maximum field of view of the mobile zoom optical system when the object distance is in the infinity state.

[0095] By controlling the range of d02m / (fa×tan(FOVa / 2)), it can be ensured that the light beam covers the center and edge of the image plane at a uniform angle, so as to avoid compression or offset of the edge light beam, thereby reducing off-axis aberrations and ensuring consistent resolution at the center and edge of the picture.

[0096] According to some embodiments of the present application, the mobile zoom optical system further satisfies: 2.00<D01s / Tr1r8<2.10, 18.50<D02m / CT5≤24.75; where D01s is the outer diameter of the plane perpendicular to the optical axis on the object side of the first lens barrel P01, D02m is the outer diameter of the plane perpendicular to the optical axis on the image side of the second lens barrel P02, Tr1r8 is the separation distance along the optical axis direction from the object side of the first lens E1 to the image side of the fourth lens E4, and CT5 is the central thickness of the fifth lens E5.

[0097] By controlling the ranges of D01s / Tr1r8 and D02m / CT5, the radial and axial spatial layouts of the first and second lens groups can be rationally adjusted. This satisfies the internal assembly requirements while constraining the overall dimensions of the optical system, which is beneficial for achieving miniaturized system design.

[0098] It should be noted that those skilled in the art should understand that, without departing from the technical solutions claimed in this application, the number of spacers constituting the zoom optical system can be changed to obtain the various results and advantages described in this specification, and this application does not specifically limit this. For example, the zoom optical system may also include other numbers of spacers than those described in the above embodiments, as needed.

[0099] The following describes some specific, non-limiting embodiments of the above-described embodiments of this application in more detail with reference to the accompanying drawings. For ease of description, in the following embodiments, OBJ (not shown in the figures) represents the object plane of the moving zoom optical system, STO represents the aperture stop, 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 prism, S12 represents the image-side surface of the prism, S13 represents the object-side surface of the filter or protective glass, S14 represents the image-side surface of the filter or protective glass, and S15 represents the image plane. In this embodiment, the optical system is exemplaryly configured with a prism, which is only an example.

[0100] Example 1 like Figure 4A and Figure 4B As shown, in this embodiment, the movable zoom optical system sequentially includes a first lens barrel P01 and a second lens barrel P02 along the optical axis from the object side to the image side. The first lens barrel P01 contains a first lens group and multiple spacer elements. The first lens group includes a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4. The second lens barrel P02 contains a second lens group, which includes a fifth lens E5. The first lens barrel P01, the first lens group, and the multiple spacer elements are fixed components, while the second lens barrel P02 and the second lens group are movable components.

[0101] In this embodiment, the first lens E1 has positive optical power, and the object-side surface S1 of the first lens E1 is convex, and the image-side surface S2 of the first lens E1 is convex; the second lens E2 has positive optical power, and the object-side surface S3 of the second lens E2 is convex, and the image-side surface S4 of the second lens E2 is convex; the third lens E3 has negative optical power, and the object-side surface S5 of the third lens E3 is concave, and the image-side surface S6 of the third lens E3 is concave; the fourth lens E4 has positive optical power, and the object-side surface S7 of the fourth lens E4 is convex, and the image-side surface S8 of the fourth lens E4 is convex; the fifth lens E5 has negative optical power, and the object-side surface S9 of the fifth lens E5 is concave, and the image-side surface S10 of the fifth lens E5 is convex.

[0102] In this embodiment, the plurality of spacers include: a first spacer P1 placed between the image side of the first lens E1 and the second lens E2 and in at least partial contact with the image side of the first lens E1; a second spacer P2 placed between the image side of the second lens E2 and the third lens E3 and in at least partial contact with the image side of the second lens E2; and a third spacer P3 placed between the image side of the third lens E3 and the fourth lens E4 and in at least partial contact with the image side of the third lens E3.

[0103] Furthermore, in this embodiment, the plurality of spacers also includes a first auxiliary spacer P1b, which is placed between the image-side surface of the first spacer P1 and the second lens E2 and contacts the image-side surface of the first spacer P1.

[0104] In this embodiment, the movable zoom optical system also includes a cap P03 placed on the side of the first lens barrel P01.

[0105] In addition, Table 1 shows the basic optical parameters of the moving zoom optical system of Embodiment 1, where the units of radius of curvature and thickness / distance are millimeters (mm).

[0106] Table 1

[0107] In this embodiment, the image-side surface of the first lens E1, and the object-side surface and image-side surface of any one of the second lens E2 to the fifth lens E5 are aspherical surfaces. The surface shape 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 of 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. Tables 2 and 3 below give the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for S2 to S10 in Example 1, where S2 to S10 are all aspherical surfaces.

[0108] Table 2

[0109] Table 3 (Continued from the previous table)

[0110] In this embodiment, the object distance D1, the on-axis distance D2 between the image side of the fourth lens E4 and the object side of the fifth lens E5, the maximum field of view FOV, the aperture value FNO, and the overall focal length f in the infinity state and the 120mm state of the moving zoom optical system are shown in Table 4.

[0111] Table 4

[0112] Example 2 like Figure 5A and Figure 5B As shown, in this embodiment, the movable zoom optical system sequentially includes a first lens barrel P01 and a second lens barrel P02 along the optical axis from the object side to the image side. The first lens barrel P01 is a fixed component, and the second lens barrel P02 is a movable component. The first lens barrel P01 contains a first lens group and multiple spacer elements. The first lens group includes a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4. The second lens barrel P02 contains a second lens group, which includes a fifth lens E5. The first lens barrel P01, the first lens group, and the multiple spacer elements are fixed components, while the second lens barrel P02 and the second lens group are movable components.

[0113] In this embodiment, the plurality of spacers include: a first spacer P1 placed between the image side of the first lens E1 and the second lens E2 and in at least partial contact with the image side of the first lens E1; a second spacer P2 placed between the image side of the second lens E2 and the third lens E3 and in at least partial contact with the image side of the second lens E2; and a third spacer P3 placed between the image side of the third lens E3 and the fourth lens E4 and in at least partial contact with the image side of the third lens E3.

[0114] In this embodiment, the plurality of spacers further includes a first auxiliary spacer element P1b, which is placed between the image-side surface of the first spacer element P1 and the second lens E2 and contacts the image-side surface of the first spacer element P1.

[0115] In this embodiment, the movable zoom optical system also includes a cap P03 placed on the side of the first lens barrel P01.

[0116] It is worth noting that, compared with Embodiment 1 above, the zoom optical system of Embodiment 2 has the same optical parameters, that is, the basic optical parameter table of the zoom optical system of Embodiment 2 is the same as Table 1, and the aspherical coefficient table is the same as Tables 2 and 3. However, the zoom optical system of Embodiment 2 has different structural parameters than the zoom optical system of Embodiment 1 above. That is, the difference between Embodiment 2 and Embodiment 1 is that the dimensional values ​​of some structural parameters of the lens barrel and multiple spacer elements in the zoom optical system are different.

[0117] Example 3 like Figure 6A and Figure 6B As shown, in this embodiment, the movable zoom optical system sequentially includes a first lens barrel P01 and a second lens barrel P02 along the optical axis from the object side to the image side. The first lens barrel P01 is a fixed component, and the second lens barrel P02 is a movable component. The first lens barrel P01 contains a first lens group and multiple spacer elements. The first lens group includes a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4. The second lens barrel P02 contains a second lens group, which includes a fifth lens E5. The first lens barrel P01, the first lens group, and the multiple spacer elements are fixed components, while the second lens barrel P02 and the second lens group are movable components.

[0118] In this embodiment, the plurality of spacers include: a first spacer P1 placed between the image side of the first lens E1 and the second lens E2 and in at least partial contact with the image side of the first lens E1; a second spacer P2 placed between the image side of the second lens E2 and the third lens E3 and in at least partial contact with the image side of the second lens E2; and a third spacer P3 placed between the image side of the third lens E3 and the fourth lens E4 and in at least partial contact with the image side of the third lens E3.

[0119] In this embodiment, the movable zoom optical system also includes a cap P03 placed on the side of the first lens barrel P01.

[0120] It is worth noting that, compared with Embodiment 1 above, the zoom optical system of Embodiment 3 has the same optical parameters, that is, the basic optical parameter table of the zoom optical system of Embodiment 3 is the same as Table 1, and the aspherical coefficient table is the same as Tables 2 and 3. However, the zoom optical system of Embodiment 3 has different structural parameters than the zoom optical system of Embodiment 1 above. That is, the difference between Embodiment 3 and Embodiment 1 is that the dimensional values ​​of some structural parameters of the lens barrel and multiple spacer elements in the zoom optical system are different.

[0121] The on-axis chromatic aberration curves of the moving zoom optical system in Examples 1, 2, and 3 at an infinity object distance are as follows: Figure 7A As shown, this represents the deviation of the convergence point of light rays of different wavelengths (0.650μm, 0.610μm, 0.555μm, 0.510μm, 0.470μm, 0.435μm) after passing through the imaging system; the astigmatism curves of the moving zoom optical system in Examples 1, 2, and 3 at an infinity object distance are shown below. Figure 7B As shown, it represents the curvature of the meridional image plane and the sagittal image plane; the distortion curves of the moving zoom optical system in Embodiments 1, 2, and 3 at an infinite object distance are shown below. Figure 7C As shown, it represents the distortion magnitude values ​​corresponding to different image heights. According to... Figures 7A to 7C It can be seen that the moving zoom optical system in Embodiments 1, 2 and 3 can achieve good imaging quality when the object distance is infinite.

[0122] The on-axis chromatic aberration curves of the moving zoom optical system in Examples 1, 2, and 3 at an object distance of 120mm are as follows: Figure 8A As shown, this represents the deviation of the convergence point of light rays of different wavelengths (0.650μm, 0.610μm, 0.555μm, 0.510μm, 0.470μm, 0.435μm) after passing through the imaging system; the astigmatism curves of the moving zoom optical system in Examples 1, 2, and 3 at an object distance of 120mm are shown below. Figure 8B As shown, it represents the curvature of the meridional image plane and the sagittal image plane; the distortion curves of the moving zoom optical system in Embodiments 1, 2, and 3 at an object distance of 120mm are shown below. Figure 8C As shown, it represents the distortion magnitude values ​​corresponding to different image heights. According to... Figures 8A to 8C It can be seen that the moving zoom optical system in Embodiments 1, 2 and 3 can achieve good imaging quality when the object distance is 120mm.

[0123] Example 4 like Figure 9A and Figure 9BAs shown, in this embodiment, the movable zoom optical system sequentially includes a first lens barrel P01 and a second lens barrel P02 along the optical axis from the object side to the image side. The first lens barrel P01 is a fixed component, and the second lens barrel P02 is a movable component. The first lens barrel P01 contains a first lens group and multiple spacer elements. The first lens group includes a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4. The second lens barrel P02 contains a second lens group, which includes a fifth lens E5. The first lens barrel P01, the first lens group, and the multiple spacer elements are fixed components, while the second lens barrel P02 and the second lens group are movable components.

[0124] In this embodiment, the first lens E1 has positive optical power, the object-side surface S1 of the first lens E1 is convex, and the image-side surface S2 of the first lens E1 is flat; the second lens E2 has positive optical power, the object-side surface S3 of the second lens E2 is convex, and the image-side surface S4 of the second lens E2 is convex; the third lens E3 has negative optical power, the object-side surface S5 of the third lens E3 is concave, and the image-side surface S6 of the third lens E3 is convex; the fourth lens E4 has positive optical power, the object-side surface S7 of the fourth lens E4 is concave, and the image-side surface S8 of the fourth lens E4 is convex; the fifth lens E5 has negative optical power, the object-side surface S9 of the fifth lens E5 is concave, and the image-side surface S10 of the fifth lens E5 is convex.

[0125] In this embodiment, the plurality of spacers include: a first spacer P1 placed between the image side of the first lens E1 and the second lens E2 and in at least partial contact with the image side of the first lens E1; a second spacer P2 placed between the image side of the second lens E2 and the third lens E3 and in at least partial contact with the image side of the second lens E2; and a third spacer P3 placed between the image side of the third lens E3 and the fourth lens E4 and in at least partial contact with the image side of the third lens E3.

[0126] In this embodiment, the plurality of spacers further includes a first auxiliary spacer element P1b, which is placed between the image-side surface of the first spacer element P1 and the second lens E2 and contacts the image-side surface of the first spacer element P1.

[0127] In this embodiment, the movable zoom optical system also includes a cap P03 placed on the side of the first lens barrel P01.

[0128] In addition, Table 5 shows the basic optical parameters of the moving zoom optical system of Embodiment 4, wherein the units of radius of curvature, thickness / distance and effective radius are all millimeters (mm).

[0129] Table 5

[0130] In this embodiment, the object-side and image-side surfaces of the first lens E1 are both spherical, while the object-side and image-side surfaces of any one of the second lens E2 to the fifth lens E5 are both aspherical. The surface shape of each aspherical lens can be defined by the aspherical formula given in Embodiment 1 above. Tables 6 and 7 below give the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used in Embodiment 4 for S3 to S10, where S3 to S10 are all aspherical.

[0131] Table 6

[0132] Table 7 (Continued from the previous table)

[0133] In this embodiment, the object distance D1, the on-axis distance D2 between the image side of the fourth lens E4 and the object side of the fifth lens E5, the maximum field of view FOV, the aperture value FNO, and the overall focal length f in the infinity state and the 120mm state of the moving zoom optical system are shown in Table 8.

[0134] Table 8

[0135] Example 5 like Figure 10A and Figure 10B As shown, in this embodiment, the movable zoom optical system sequentially includes a first lens barrel P01 and a second lens barrel P02 along the optical axis from the object side to the image side. The first lens barrel P01 is a fixed component, and the second lens barrel P02 is a movable component. The first lens barrel P01 contains a first lens group and multiple spacer elements. The first lens group includes a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4. The second lens barrel P02 contains a second lens group, which includes a fifth lens E5. The first lens barrel P01, the first lens group, and the multiple spacer elements are fixed components, while the second lens barrel P02 and the second lens group are movable components.

[0136] In this embodiment, the plurality of spacers include: a first spacer P1 placed between the image side of the first lens E1 and the second lens E2 and in at least partial contact with the image side of the first lens E1; a second spacer P2 placed between the image side of the second lens E2 and the third lens E3 and in at least partial contact with the image side of the second lens E2; and a third spacer P3 placed between the image side of the third lens E3 and the fourth lens E4 and in at least partial contact with the image side of the third lens E3.

[0137] In this embodiment, the plurality of spacers further includes: a first auxiliary spacer P1b disposed between the image side of the first spacer P1 and the second lens E2 and in contact with the image side of the first spacer P1, and a second auxiliary spacer P1c disposed between the image side of the first auxiliary spacer P1b and the second lens E2 and in contact with the first auxiliary spacer P1b.

[0138] In this embodiment, the movable zoom optical system also includes a cap P03 placed on the side of the first lens barrel P01.

[0139] It is worth noting that, compared with Embodiment 4 above, the zoom optical system of Embodiment 5 has the same optical parameters, that is, the basic optical parameter table of the zoom optical system of Embodiment 5 is the same as Table 5, and the aspherical coefficient table is the same as Tables 6 and 7. However, the zoom optical system of Embodiment 5 has different structural parameters than the zoom optical system of Embodiment 4 above. That is, the difference between Embodiment 5 and Embodiment 4 is that the dimensional values ​​of some structural parameters of the lens barrel and multiple spacer elements in the zoom optical system are different.

[0140] Example 6 like Figure 11A and Figure 11B As shown, in this embodiment, the movable zoom optical system sequentially includes a first lens barrel P01 and a second lens barrel P02 along the optical axis from the object side to the image side. The first lens barrel P01 is a fixed component, and the second lens barrel P02 is a movable component. The first lens barrel P01 contains a first lens group and multiple spacer elements. The first lens group includes a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4. The second lens barrel P02 contains a second lens group, which includes a fifth lens E5. The first lens barrel P01, the first lens group, and the multiple spacer elements are fixed components, while the second lens barrel P02 and the second lens group are movable components.

[0141] In this embodiment, the plurality of spacers include: a first spacer P1 placed between the image side of the first lens E1 and the second lens E2 and in at least partial contact with the image side of the first lens E1; a second spacer P2 placed between the image side of the second lens E2 and the third lens E3 and in at least partial contact with the image side of the second lens E2; and a third spacer P3 placed between the image side of the third lens E3 and the fourth lens E4 and in at least partial contact with the image side of the third lens E3.

[0142] In this embodiment, the plurality of spacers further includes a first auxiliary spacer element P1b, which is placed between the image-side surface of the first spacer element P1 and the second lens E2 and contacts the image-side surface of the first spacer element P1.

[0143] In this embodiment, the movable zoom optical system also includes a cap P03 placed on the side of the first lens barrel P01.

[0144] It is worth noting that, compared with Embodiment 4 above, the zoom optical system of Embodiment 6 has the same optical parameters, that is, the basic optical parameter table of the zoom optical system of Embodiment 6 is the same as Table 5, and the aspherical coefficient table is the same as Tables 6 and 7. However, the zoom optical system of Embodiment 6 has different structural parameters than the zoom optical system of Embodiment 4 above. That is, the difference between Embodiment 6 and Embodiment 4 is that the dimensional values ​​of some structural parameters of the lens barrel and multiple spacer elements in the zoom optical system are different.

[0145] The on-axis chromatic aberration curves of the moving zoom optical system in Examples 4, 5, and 6 at an infinity object distance are as follows: Figure 12A As shown, this represents the deviation of the convergence point of light rays of different wavelengths (0.650μm, 0.610μm, 0.555μm, 0.510μm, 0.470μm, 0.435μm) after passing through the imaging system; the astigmatism curves of the moving zoom optical system in Examples 4, 5, and 6 at an infinity object distance are shown below. Figure 12B As shown, it represents the curvature of the meridional image plane and the sagittal image plane; the distortion curves of the moving zoom optical system in Embodiments 4, 5, and 6 at an infinite object distance are shown below. Figure 12C As shown, it represents the distortion magnitude values ​​corresponding to different image heights. According to... Figures 12A to 12C It can be seen that the moving zoom optical system in Embodiments 4, 5 and 6 can all achieve good imaging quality.

[0146] The on-axis chromatic aberration curves of the moving zoom optical system in Examples 4, 5, and 6 at an object distance of 120mm are as follows: Figure 13A As shown, this represents the deviation of the convergence point of light rays of different wavelengths (0.650μm, 0.610μm, 0.555μm, 0.510μm, 0.470μm, 0.435μm) after passing through the imaging system; the astigmatism curves of the moving zoom optical system in Examples 4, 5, and 6 at an object distance of 120mm are shown below. Figure 13B As shown, it represents the curvature of the meridional image plane and the sagittal image plane; the distortion curves of the moving zoom optical system in Examples 4, 5, and 6 at an object distance of 120mm are as follows. Figure 13C As shown, it represents the distortion magnitude values ​​corresponding to different image heights. According to... Figures 13A to 13C It can be seen that the moving zoom optical system in Embodiments 4, 5 and 6 can achieve good imaging quality when the object distance is 120mm.

[0147] Example 7 like Figure 14A and Figure 14B As shown, in this embodiment, the movable zoom optical system sequentially includes a first lens barrel P01 and a second lens barrel P02 along the optical axis from the object side to the image side. The first lens barrel P01 is a fixed component, and the second lens barrel P02 is a movable component. The first lens barrel P01 contains a first lens group and multiple spacer elements. The first lens group includes a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4. The second lens barrel P02 contains a second lens group, which includes a fifth lens E5. The first lens barrel P01, the first lens group, and the multiple spacer elements are fixed components, while the second lens barrel P02 and the second lens group are movable components.

[0148] In this embodiment, the first lens E1 has positive optical power, the object-side surface S1 of the first lens E1 is convex, and the image-side surface S2 of the first lens E1 is planar; the second lens E2 has positive optical power, the object-side surface S3 of the second lens E2 is convex, and the image-side surface S4 of the second lens E2 is concave; the third lens E3 has negative optical power, the object-side surface S5 of the third lens E3 is concave, and the image-side surface S6 of the third lens E3 is convex; the fourth lens E4 has positive optical power, the object-side surface S7 of the fourth lens E4 is concave, and the image-side surface S8 of the fourth lens E4 is convex; the fifth lens E5 has negative optical power, the object-side surface S9 of the fifth lens E5 is concave, and the image-side surface S10 of the fifth lens E5 is convex.

[0149] In this embodiment, the plurality of spacers include: a first spacer P1 placed between the image side of the first lens E1 and the second lens E2 and in at least partial contact with the image side of the first lens E1; a second spacer P2 placed between the image side of the second lens E2 and the third lens E3 and in at least partial contact with the image side of the second lens E2; and a third spacer P3 placed between the image side of the third lens E3 and the fourth lens E4 and in at least partial contact with the image side of the third lens E3.

[0150] In this embodiment, the plurality of spacers further includes: a first auxiliary spacer P1b disposed between the image side of the first spacer P1 and the second lens E2 and in contact with the image side of the first spacer P1, and a second auxiliary spacer P1c disposed between the image side of the first auxiliary spacer P1b and the second lens E2 and in contact with the first auxiliary spacer P1b.

[0151] In this embodiment, the movable zoom optical system also includes a cap P03 placed on the side of the first lens barrel P01.

[0152] In addition, Table 9 shows the basic optical parameters of the moving zoom optical system of Embodiment 7, wherein the units of radius of curvature, thickness / distance and effective radius are all millimeters (mm).

[0153] Table 9

[0154] In this embodiment, the object-side and image-side surfaces of the first lens E1 are both spherical, while the object-side and image-side surfaces of any one of the second lens E2 to the fifth lens E5 are both aspherical. The surface shape of each aspherical lens can be defined by the aspherical formula given in Embodiment 1 above. Tables 10 and 11 below give the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used in Embodiment 7 for S3 to S10, where S3 to S10 are all aspherical.

[0155] Table 10

[0156] Table 11 (Continued from the previous table)

[0157] In this embodiment, the object distance D1, the on-axis distance D2 between the image side of the fourth lens E4 and the object side of the fifth lens E5, the maximum field of view FOV, the aperture value FNO, and the overall focal length f in the infinity state and the 120mm state of the moving zoom optical system are shown in Table 12.

[0158] Table 12

[0159] Example 8 like Figure 15A and Figure 15B As shown, in this embodiment, the movable zoom optical system includes a first lens barrel P01 and a second lens barrel P02 sequentially from the object side to the image side along the optical axis. The first lens barrel P01 is a fixed component, and the second lens barrel P02 is a movable component. The first lens barrel P01 contains a first lens group and multiple spacer elements. The first lens group includes a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4. The second lens barrel P02 contains a second lens group, which includes a fifth lens E5.

[0160] In this embodiment, the plurality of spacer elements includes: a first spacer element P1 positioned between the image-side surface of the first lens E1 and the second lens E2 and in at least partial contact with the image-side surface of the first lens E1; a second spacer element P2 positioned between the image-side surface of the second lens E2 and the third lens E3 and in at least partial contact with the image-side surface of the second lens E2; and a third spacer element P3 positioned between the image-side surface of the third lens E3 and the fourth lens E4 and in at least partial contact with the image-side surface of the third lens E3. The first lens barrel P01, the first lens group, and the plurality of spacer elements are fixed components, while the second lens barrel P02 and the second lens group are movable components.

[0161] In this embodiment, the plurality of spacers further includes: a first auxiliary spacer P1b disposed between the image side of the first spacer P1 and the second lens E2 and in contact with the image side of the first spacer P1, and a second auxiliary spacer P1c disposed between the image side of the first auxiliary spacer P1b and the second lens E2 and in contact with the first auxiliary spacer P1b.

[0162] In this embodiment, the movable zoom optical system also includes a cap P03 placed on the side of the first lens barrel P01.

[0163] It is worth noting that, compared with Embodiment 7 above, the zoom optical system of Embodiment 8 has the same optical parameters, that is, the basic optical parameter table of the zoom optical system of Embodiment 8 is the same as Table 9, and the aspherical coefficient table is the same as Tables 10 and 11. However, the zoom optical system of Embodiment 8 has different structural parameters than the zoom optical system of Embodiment 7 above. That is, the difference between Embodiment 8 and Embodiment 7 is that the dimensional values ​​of some structural parameters of the lens barrel and multiple spacer elements in the zoom optical system are different.

[0164] Example 9 like Figure 16A and Figure 16B As shown, in this embodiment, the movable zoom optical system sequentially includes a first lens barrel P01 and a second lens barrel P02 along the optical axis from the object side to the image side. The first lens barrel P01 is a fixed component, and the second lens barrel P02 is a movable component. The first lens barrel P01 contains a first lens group and multiple spacer elements. The first lens group includes a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4. The second lens barrel P02 contains a second lens group, which includes a fifth lens E5. The first lens barrel P01, the first lens group, and the multiple spacer elements are fixed components, while the second lens barrel P02 and the second lens group are movable components.

[0165] In this embodiment, the plurality of spacers include: a first spacer P1 placed between the image side of the first lens E1 and the second lens E2 and in at least partial contact with the image side of the first lens E1; a second spacer P2 placed between the image side of the second lens E2 and the third lens E3 and in at least partial contact with the image side of the second lens E2; and a third spacer P3 placed between the image side of the third lens E3 and the fourth lens E4 and in at least partial contact with the image side of the third lens E3.

[0166] In this embodiment, the plurality of spacers further includes a first auxiliary spacer element P1b, which is placed between the image-side surface of the first spacer element P1 and the second lens E2 and contacts the image-side surface of the first spacer element P1.

[0167] In this embodiment, the movable zoom optical system also includes a cap P03 placed on the side of the first lens barrel P01.

[0168] It is worth noting that, compared with Embodiment 7 above, the zoom optical system of Embodiment 9 has the same optical parameters, that is, the basic optical parameter table of the zoom optical system of Embodiment 9 is the same as Table 9, and the aspherical coefficient table is the same as Tables 10 and 11. However, the zoom optical system of Embodiment 9 has different structural parameters than the zoom optical system of Embodiment 7 above. That is, the difference between Embodiment 9 and Embodiment 7 is that the dimensional values ​​of some structural parameters of the lens barrel and multiple spacer elements in the zoom optical system are different.

[0169] The on-axis chromatic aberration curves of the moving zoom optical system in Examples 7, 8, and 9 at an infinity object distance are as follows: Figure 17A As shown, this represents the deviation of the convergence point of light rays of different wavelengths (0.650μm, 0.610μm, 0.555μm, 0.510μm, 0.470μm, 0.435μm) after passing through the imaging system; the astigmatism curves of the moving zoom optical system in Examples 7, 8, and 9 at an infinity object distance are shown below. Figure 17B As shown, it represents the curvature of the meridional image plane and the sagittal image plane; the distortion curves of the moving zoom optical system in Embodiments 7, 8, and 9 at an infinite object distance are shown below. Figure 17C As shown, it represents the distortion magnitude values ​​corresponding to different image heights. According to... Figures 17A to 17C It can be seen that the moving zoom optical system in Embodiments 7, 8 and 9 can achieve good imaging quality when the object distance is infinite.

[0170] The on-axis chromatic aberration curves of the moving zoom optical system in Examples 7, 8, and 9 at an object distance of 120mm are as follows: Figure 18AAs shown, this represents the deviation of the convergence point of light rays of different wavelengths (0.650μm, 0.610μm, 0.555μm, 0.510μm, 0.470μm, 0.435μm) after passing through the imaging system; the astigmatism curves of the moving zoom optical system in Examples 7, 8, and 9 at an object distance of 120mm are shown below. Figure 18B As shown, it represents the curvature of the meridional image plane and the sagittal image plane; the distortion curves of the moving zoom optical system in Embodiments 7, 8, and 9 at an object distance of 120mm are as follows. Figure 18C As shown, it represents the distortion magnitude values ​​corresponding to different image heights. According to... Figures 18A to 18C It can be seen that the moving zoom optical system in Embodiments 7, 8 and 9 can achieve good imaging quality when the object distance is 120mm.

[0171] In summary, in Examples 1 to 9, the maximum field of view (FOVa) of the mobile zoom optical system at an infinity object distance, the effective focal length (fa) of the mobile zoom optical system at an infinity object distance, the effective focal length (fb) of the mobile zoom optical system at an object distance of 120mm, the effective focal lengths (f1 to f4) of the first lens E1 to the fourth lens E4 in the mobile zoom optical system, the effective focal length (F1) of the first lens group, the effective focal length (F2) of the second lens group, the distance (Tr1r8) between the object side surface of the first lens E1 and the image side surface of the fourth lens E4 along the optical axis, and the distance (Tr1r8) of the second lens barrel P02 along the optical axis when the mobile zoom optical system changes from an infinity object distance to an object distance of 120mm. The maximum movable distance ΔT in the direction, the maximum radius DT11 of the optically effective area of ​​the object side of the first lens E1, the maximum radius DT42 of the optically effective area of ​​the image side of the fourth lens E4, the axial displacement 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 optically effective area of ​​the object side of the first lens E1, the axial displacement SAG42 between the intersection of the image side of the fourth lens E4 and the optical axis and the vertex of the effective radius of the optically effective area of ​​the image side of the fourth lens E4, and the axial displacement SAG51 between the intersection of the object side of the fifth lens E5 and the optical axis and the vertex of the effective radius of the optically effective area of ​​the object side of the fifth lens E5 are shown in Table 13 below.

[0172] Table 13

[0173] In addition, some structural parameters of the moving zoom optical system in Examples 1 to 9 are shown in Table 14, with each structural parameter in millimeters (mm).

[0174] Table 14

[0175] In summary, the conditions satisfied by the moving zoom optical systems in Examples 1 to 9 are shown in Table 15.

[0176] Table 15

[0177] 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 movable zoom optical system and a photosensitive element, the photosensitive element being disposed on the image side of the movable zoom optical system for imaging. It is understood that the photosensitive element mentioned in this application may be, but is not limited to, a charge-coupled device (CCD) or a complementary metal oxide semiconductor (CMOS) device, and this application will not elaborate further on these aspects.

[0178] 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.

[0179] 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.

[0180] 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 mobile zoom optical system, characterized in that: Along the optical axis, from the object side to the image side, it consists of a first lens tube and a second lens tube in sequence; wherein... The first lens barrel is a fixed component, and the second lens barrel is a movable component; The first lens barrel includes a first lens group and multiple spacer elements. The first lens group contains four lenses with optical power. The first lens group includes: A first lens having positive optical power, wherein the object-side surface of the first lens is convex. A second lens with positive optical power, wherein the object-side surface of the second lens is convex. A third lens with negative optical power, wherein the object-side surface of the third lens is concave. A fourth lens with positive optical power, wherein the image-side surface of the fourth lens is convex; The plurality of spacer elements include: A first spacer element is placed between the image-side surface of the first lens and the second lens and is at least partially in contact with the image-side surface of the first lens. The second spacer element is positioned between the image-side surface of the second lens and the third lens and is at least partially in contact with the image-side surface of the second lens. A third spacer element is placed between the image-side surface of the third lens and the fourth lens and is at least partially in contact with the image-side surface of the third lens; The second lens barrel contains a second lens group, which has one lens with optical power. The second lens group includes: A fifth lens with negative optical power, wherein the object-side surface of the fifth lens is concave and the image-side surface of the fifth lens is convex; And satisfy: 2.55≤ΔT / CT5<2.95; 0.15 <L2 / (D02m-d02m)≤0.45; Wherein, ΔT is the maximum movable distance of the second lens barrel along the optical axis when the moving zoom optical system changes from an object distance of infinity to an object distance of 120mm, CT5 is the center thickness of the fifth lens, L2 is the maximum height of the second lens barrel, D02m is the outer diameter of the plane perpendicular to the optical axis on the image side of the second lens barrel, and d02m is the inner diameter of the plane perpendicular to the optical axis on the image side of the second lens barrel.

2. The mobile zoom optical system according to claim 1, characterized in that, The aforementioned zoom optical system also satisfies: 3.40 <L2 / |SAG51|<10.00; Wherein, L2 is the maximum height of the second lens barrel, and SAG51 is the axial displacement between the intersection of the side surface of the fifth lens and the optical axis and the vertex of the effective radius of the optically effective area of ​​the side surface of the fifth lens.

3. The mobile zoom optical system according to claim 1, characterized in that, The aforementioned zoom optical system also satisfies: 2.90≤fa / (L1+L2)<3.30, 2.75 <fb / (L1+L2)<3.15; Wherein, fa is the effective focal length of the moving zoom optical system when the object distance is infinite, fb is the effective focal length of the moving zoom optical system when the object distance is 120mm, L1 is the maximum height of the first lens barrel, and L2 is the maximum height of the second lens barrel.

4. The mobile zoom optical system according to claim 1, characterized in that, The aforementioned zoom optical system also satisfies: 3.35 <F1 / (EP01+EP12+EP23)<4.15; Wherein, F1 is the effective focal length of the first lens group, EP01 is the distance between the object side of the first lens barrel and the object side of the first spacer element along the optical axis, EP12 is the distance between the image side of the first spacer element and the object side of the second spacer element along the optical axis, and EP23 is the distance between the image side of the second spacer element and the object side of the third spacer element along the optical axis.

5. The mobile zoom optical system according to claim 1, characterized in that, The aforementioned zoom optical system also satisfies: -4.85 <F2 / d02s<-4.05; Wherein, F2 is the effective focal length of the second lens group, and d02s is the inner diameter of the plane perpendicular to the optical axis on the side of the second lens barrel.

6. The mobile zoom optical system according to claim 1, characterized in that, The movable zoom optical system further includes a cap, the cap being annular, the central axis of the cap being coaxial with the optical axis, the cap having an object-side surface facing the object side and an image-side surface facing the image side, the cap being disposed on the object-side surface of the first lens barrel; and satisfying: 1.95 <d03s / DT11<2.20; Wherein, d03s is the inner diameter of the plane perpendicular to the optical axis on the side of the cap, and DT11 is the maximum radius of the optically effective area on the side of the first lens.

7. The mobile zoom optical system according to any one of claims 1 to 6, characterized in that, The movable zoom optical system further includes a cap, which is ring-shaped, with the central axis of the cap arranged coaxially with the optical axis. The cap has an object-side surface facing the object side and an image-side surface facing the image side, and the cap is disposed on the object-side surface of the first lens barrel. The movable zoom optical system also satisfies: 1.00 <d01s / D03m<1.05; Wherein, d01s is the inner diameter of the plane perpendicular to the optical axis on the side of the first lens barrel, and D03m is the outer diameter of the plane perpendicular to the optical axis on the side of the cap image.

8. The mobile zoom optical system according to claim 1, characterized in that, The aforementioned zoom optical system also satisfies: 0.30≤(DT11-DT42) / (d01s-d01m)<1.25; Wherein, DT11 is the maximum radius of the optically effective area on the side of the first lens, DT42 is the maximum radius of the optically effective area on the side of the fourth lens, d01s is the inner diameter of the plane perpendicular to the optical axis on the side of the first lens barrel, and d01m is the inner diameter of the plane perpendicular to the optical axis on the side of the first lens barrel.

9. The mobile zoom optical system according to claim 1, characterized in that, The aforementioned zoom optical system also satisfies: -0.20 < (D02s - d02s) / R9 < 0.00; Wherein, D02s is the outer diameter of the plane perpendicular to the optical axis of the second lens barrel, d02s is the inner diameter of the plane perpendicular to the optical axis of the second lens barrel, and R9 is the radius of curvature of the side surface of the fifth lens.

10. The mobile zoom optical system according to claim 1, characterized in that, The aforementioned zoom optical system also satisfies: 0.10 <SAG11 / L1<0.20,-0.15<SAG42 / L1<-0.05; Wherein, SAG11 is the axial displacement between the intersection of the first lens object side and the optical axis and the vertex of the effective radius of the optically effective area of ​​the first lens object side, SAG42 is the axial displacement between the intersection of the fourth lens image side and the optical axis and the vertex of the effective radius of the optically effective area of ​​the fourth lens image side, and L1 is the maximum height of the first lens barrel.

11. The mobile zoom optical system according to claim 1, characterized in that, The aforementioned zoom optical system also satisfies: -0.45 <F1 / F2≤-0.40,0.00<|d02s-d01m| / ΔT<1.85; Wherein, F1 is the effective focal length of the first lens group, F2 is the effective focal length of the second lens group, d02s is the inner diameter of the plane perpendicular to the optical axis on the object side of the second lens barrel, d01m is the inner diameter of the plane perpendicular to the optical axis on the image side of the first lens barrel, and ΔT is the maximum movable distance of the second lens barrel along the optical axis when the moving zoom optical system changes from an object distance of infinity to an object distance of 120mm.

12. The mobile zoom optical system according to claim 1, characterized in that, The aforementioned zoom optical system also satisfies: 0.90 <d02m / (fa×tan(FOVa / 2))<1.35; Wherein, d02m is the inner diameter of the plane perpendicular to the optical axis on the image side of the second lens barrel, fa is the effective focal length of the moving zoom optical system when the object distance is infinite, and FOVa is the maximum field of view of the moving zoom optical system when the object distance is infinite.

13. The mobile zoom optical system according to claim 1, characterized in that, The aforementioned zoom optical system also satisfies: 2.00 <D01s / Tr1r8<2.10,18.50<D02m / CT5≤24.75; Wherein, D01s is the outer diameter of the plane perpendicular to the optical axis of the first lens barrel object side, D02m is the outer diameter of the plane perpendicular to the optical axis of the second lens barrel image side, Tr1r8 is the distance between the first lens object side and the fourth lens image side along the optical axis, and CT5 is the center thickness of the fifth lens.

Images