Lens set, optical system, and electronic device

Abstract

The application provides a lens set, an optical system and an electronic device. The lens set comprises a first lens set, a second lens set and a third lens set, the first lens set comprises a first lens to a fourth lens, the second lens set comprises a fifth lens to an eighth lens, and the third lens set comprises a ninth lens to a thirteenth lens. 0.86≤f5 / T45≤4.55, 2.65≤F910 / (CT9+CT10)≤3.52, and -2.75<f11 / F1213<-1.50, wherein f5 is the effective focal length of the fifth lens, T45 is the air interval of the fourth lens and the fifth lens on the optical axis, F910 is the combined focal length of the ninth lens and the tenth lens, CT9 is the center thickness of the ninth lens, CT10 is the center thickness of the tenth lens, f11 is the effective focal length of the eleventh lens, and F1213 is the combined focal length of the twelfth lens and the thirteenth lens. The lens set can obtain a high-quality telephoto imaging effect.

Description

Technical Field

[0001] This application relates to the field of optics, and more specifically, to a lens assembly, an optical system, and an electronic device. Background Technology

[0002] With the rapid development of mobile photography technology, users are placing increasingly higher demands on the image quality and shooting scenarios of smartphones. Existing external telephoto lens solutions mostly adopt simple lens group structures, which, while significantly changing the focal length, are prone to introducing severe chromatic aberration, field curvature, and distortion, resulting in deterioration of edge image quality. Summary of the Invention

[0003] One aspect of this application provides a lens assembly, which sequentially includes a first lens assembly, a second lens assembly, and a third lens assembly along the optical axis from the object side to the image side. The first lens assembly has positive optical power and includes: a first lens with positive optical power, wherein the object-side surface of the first lens is convex and the image-side surface of the first lens is convex; a second lens with negative optical power, wherein the object-side surface of the second lens is concave; a third lens with positive optical power, wherein the object-side surface of the third lens is convex and the image-side surface of the third lens is convex; and a fourth lens with negative optical power, wherein the object-side surface of the fourth lens is concave. The fourth lens has a concave image-side surface; the second lens group has positive optical power, and the second lens group includes: a fifth lens with positive optical power; a sixth lens with positive optical power, wherein the object-side surface of the sixth lens is convex; a seventh lens with negative optical power, wherein the image-side surface of the seventh lens is concave; an eighth lens with either positive or negative optical power, wherein the object-side surface of the eighth lens is concave and the image-side surface of the eighth lens is convex; the third lens group has positive optical power, and the third lens group includes: a ninth lens with negative optical power, wherein the image-side surface of the ninth lens is concave; a tenth lens with positive optical power... Lenses, wherein the object-side surface of the tenth lens is convex, and the image-side surface of the tenth lens is convex; an eleventh lens having negative optical power, wherein the object-side surface of the eleventh lens is concave, and the image-side surface of the eleventh lens is convex; a twelfth lens having positive optical power, wherein the object-side surface of the twelfth lens is concave, and the image-side surface of the twelfth lens is convex; a thirteenth lens having positive optical power, wherein the object-side surface of the thirteenth lens is convex; the first lens and the second lens are cemented together; the third lens and the fourth lens are cemented together; the sixth lens and the seventh lens are cemented together; and the ninth lens and the tenth lens are cemented together. The lens group satisfies: 0.86≤f5 / T45≤4.55; 2.65≤F910 / (CT9+CT10)≤3.52; -2.75<f11 / F1213<-1.50; where f5 is the effective focal length of the fifth lens, T45 is the air gap between the fourth and fifth lenses on the optical axis, F910 is the combined focal length of the ninth and tenth lenses, CT9 is the center thickness of the ninth lens, CT10 is the center thickness of the tenth lens, f11 is the effective focal length of the eleventh lens, and F1213 is the combined focal length of the twelfth and thirteenth lenses.

[0004] According to an embodiment of this application, the lens group satisfies: 1.90 < FG2 / LG2 < 2.45, where FG2 is the combined focal length of the second lens group, and LG2 is the on-axis distance from the object side of the fifth lens to the image side of the eighth lens.

[0005] According to an embodiment of this application, the lens group satisfies: 2.10 < F12 / R1 < 4.50, where F12 is the combined focal length of the first lens and the second lens, and R1 is the radius of curvature of the object side surface of the first lens.

[0006] According to an embodiment of this application, the lens group satisfies: -0.65 < (f3 + f4) / (f1 + f2) ≤ -0.20, where f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens.

[0007] According to an embodiment of this application, the lens group satisfies: 2.95 < ∑CTG2 / CT8 < 3.50, where ∑CTG2 is the sum of the center thicknesses of all lenses from the fifth lens to the eighth lens, and CT8 is the center thickness of the eighth lens.

[0008] According to an embodiment of this application, the lens group satisfies: 1.90 < FG3 / T89 < 2.55, where FG3 is the combined focal length of the third lens group, and T89 is the air gap between the eighth lens and the ninth lens on the optical axis.

[0009] According to an embodiment of this application, the lens group satisfies: 0.75 < FG1 / TD < 1.65, where FG1 is the combined focal length of the first lens group, and TD is the on-axis distance from the object side of the first lens to the image side of the thirteenth lens.

[0010] According to an embodiment of this application, the lens group satisfies 0.55≤(f13×N13) / (f12×N12)<1.60, where f13 is the effective focal length of the thirteenth lens, N13 is the refractive index of the thirteenth lens, f12 is the effective focal length of the twelfth lens, and N12 is the refractive index of the twelfth lens.

[0011] According to an embodiment of this application, the lens group satisfies: 1.20 < R14 / T78 < 2.00, where R14 is the radius of curvature of the image side of the seventh lens, and T78 is the air gap between the seventh lens and the eighth lens on the optical axis.

[0012] According to an embodiment of this application, the lens group satisfies: 2.00 < LG3 / f10 < 3.50, where LG3 is the axial distance from the object side of the ninth lens to the image side of the thirteenth lens, and f10 is the effective focal length of the tenth lens.

[0013] According to an embodiment of this application, the lens group satisfies: 1.60≤F91011 / |F67|≤4.05, where F91011 is the combined focal length of the ninth lens, the tenth lens and the eleventh lens, and F67 is the combined focal length of the sixth lens and the seventh lens.

[0014] According to an embodiment of this application, the lens group satisfies: 1.00 < ∑CTG1 / ∑CTG3 < 1.65, where ∑CTG1 is the sum of the center thicknesses of all lenses from the first lens to the fourth lens, and ∑CTG3 is the sum of the center thicknesses of all lenses from the ninth lens to the thirteenth lens.

[0015] According to an embodiment of this application, the lens group satisfies: -4.75 < (R23 + R24) / R25 < -2.25, where R23 is the radius of curvature of the object side of the twelfth lens, R24 is the radius of curvature of the image side of the twelfth lens, and R25 is the radius of curvature of the object side of the thirteenth lens.

[0016] Another aspect of the embodiments of this application provides an optical system that includes a lens group provided in any embodiment of this application.

[0017] According to an embodiment of this application, the optical system further includes an imaging lens and an imaging surface located on the image side of the thirteenth lens, wherein the outgoing light beam of the lens group enters the imaging lens to form an image on the imaging surface using the imaging lens.

[0018] According to an embodiment of this application, the optical system satisfies: -4.10 < f / FG3 < -3.60, where f is the effective focal length of the optical system and FG3 is the combined focal length of the third lens group.

[0019] According to an embodiment of this application, the optical system satisfies: -1.45≤f / (LG1+LG2)≤-1.01, where f is the effective focal length of the optical system, LG1 is the on-axis distance from the object side of the first lens to the image side of the fourth lens, and LG2 is the on-axis distance from the object side of the fifth lens to the image side of the eighth lens.

[0020] Another aspect of this application provides an electronic device including the optical system provided in any embodiment of this application.

[0021] According to the technical solution of this application embodiment, the lens group is reasonably configured. Through the coordinated constraints of three conditional expressions—0.86≤f5 / T45≤4.55, 2.65≤F910 / (CT9+CT10)≤3.52, and -2.75<f11 / F1213<-1.50—an effective balance mechanism is established between optical power distribution, thickness and spacing control, and aberration correction. This provides a structural guarantee that the light passing through the lens group can match the imaging lens, thereby obtaining high-quality telephoto imaging effects. The lower limit of the conditional expressions ensures that the fifth lens and the cemented group of the ninth and tenth lenses have sufficient optical power contribution to balance the chromatic aberration and spherical aberration at the back end of the system; the upper limit effectively controls the front-end volume and overall length of the third lens group, thereby controlling sensitivity and field curvature, and avoiding over-correction of the system that introduces advanced aberrations. Attached Figure Description

[0022] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments, taken in conjunction with the accompanying drawings. In the drawings:

[0023] Figure 1 This application provides a schematic diagram of the overall architecture of an optical system.

[0024] Figure 2 A schematic diagram of the lens assembly of Embodiment 1 provided in this application is shown;

[0025] Figure 3 A schematic diagram of the on-axis chromatic aberration curve of the optical system of Embodiment 1 is shown;

[0026] Figure 4 A schematic diagram of the astigmatism curve of the optical system of Embodiment 1 is shown;

[0027] Figure 5 A schematic diagram of the distortion curve of the optical system in Embodiment 1 is shown;

[0028] Figure 6 A schematic diagram of the lens assembly of Embodiment 2 provided in this application is shown;

[0029] Figure 7 A schematic diagram of the on-axis chromatic aberration curve of the optical system of Embodiment 2 is shown;

[0030] Figure 8 A schematic diagram of the astigmatism curve of the optical system in Embodiment 2 is shown;

[0031] Figure 9 A schematic diagram of the distortion curve of the optical system in Embodiment 2 is shown;

[0032] Figure 10 A schematic diagram of the lens assembly of Embodiment 3 provided in this application is shown;

[0033] Figure 11 A schematic diagram of the on-axis chromatic aberration curve of the optical system of Embodiment 3 is shown;

[0034] Figure 12 A schematic diagram of the astigmatism curve of the optical system in Embodiment 3 is shown;

[0035] Figure 13 A schematic diagram of the distortion curve of the optical system in Embodiment 3 is shown;

[0036] Figure 14 A schematic diagram of the lens assembly of Embodiment 4 provided in this application is shown;

[0037] Figure 15 A schematic diagram of the on-axis chromatic aberration curve of the optical system of Embodiment 4 is shown;

[0038] Figure 16 A schematic diagram of the astigmatism curve of the optical system of Embodiment 4 is shown;

[0039] Figure 17 A schematic diagram of the distortion curve of the optical system in Embodiment 4 is shown;

[0040] Figure 18 A schematic diagram of the lens assembly of Embodiment 5 provided in this application is shown;

[0041] Figure 19 A schematic diagram of the on-axis chromatic aberration curve of the optical system of Embodiment 5 is shown;

[0042] Figure 20 A schematic diagram of the astigmatism curve of the optical system of Embodiment 5 is shown;

[0043] Figure 21 A schematic diagram of the distortion curve of the optical system in Embodiment 5 is shown;

[0044] Figure 22 A schematic diagram of the lens assembly of Embodiment Six provided in this application is shown;

[0045] Figure 23 A schematic diagram of the on-axis chromatic aberration curve of the optical system of Embodiment Six is ​​shown;

[0046] Figure 24 A schematic diagram of the astigmatism curve of the optical system of Embodiment Six is ​​shown; and

[0047] Figure 25 A schematic diagram of the distortion curve of the optical system of Embodiment Six is ​​shown. Detailed Implementation

[0048] 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.

[0049] It should be noted that in this specification, the terms "first," "second," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens, and the second lens may also be referred to as the first lens.

[0050] 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.

[0051] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region.

[0052] 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.

[0053] 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.

[0054] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0055] The features, principles and other aspects of this application are described in detail below.

[0056] This application provides a lens assembly that includes a first lens group, a second lens group, and a third lens group in sequence from the object side to the image side along the optical axis.

[0057] The first lens group has positive optical power and includes: a first lens with positive optical power, the object side of the first lens being convex and the image side of the first lens being convex; a second lens with negative optical power, the object side of the second lens being concave; a third lens with positive optical power, the object side of the third lens being convex and the image side of the third lens being convex; and a fourth lens with negative optical power, the object side of the fourth lens being concave and the image side of the fourth lens being concave.

[0058] The second lens group has positive optical power and includes: a fifth lens with positive optical power; a sixth lens with positive optical power, the object side of the sixth lens being convex; a seventh lens with negative optical power, the image side of the seventh lens being concave; and an eighth lens with either positive or negative optical power, the object side of the eighth lens being concave and the image side of the eighth lens being convex.

[0059] The third lens group has positive optical power and includes: a ninth lens with negative optical power, the image side of which is concave; a tenth lens with positive optical power, the object side of which is convex; an eleventh lens with negative optical power, the object side of which is concave; and an image side of which is convex. The twelfth lens has positive optical power, the object side of which is concave; and an image side of which is convex.

[0060] The first and second lenses are cemented together, the third and fourth lenses are cemented together, the sixth and seventh lenses are cemented together, and the ninth and tenth lenses are cemented together.

[0061] The lens group satisfies: 0.86≤f5 / T45≤4.55; 2.65≤F910 / (CT9+CT10)≤3.52; -2.75<f11 / F1213<-1.50; f5 is the effective focal length of the fifth lens, T45 is the air gap between the fourth and fifth lenses on the optical axis, F910 is the combined focal length of the ninth and tenth lenses, CT9 is the center thickness of the ninth lens, CT10 is the center thickness of the tenth lens, f11 is the effective focal length of the eleventh lens, and F1213 is the combined focal length of the twelfth and thirteenth lenses.

[0062] The lens group provided in this application establishes an effective balance mechanism between optical power distribution, center thickness and spacing control, and aberration correction through the coordinated constraints of three conditional expressions: 0.86≤f5 / T45≤4.55, 2.65≤F910 / (CT9+CT10)≤3.52, and -2.75<f11 / F1213<-1.50. This provides structural assurance that the light passing through the lens group can match the imaging lens, thereby obtaining high-quality telephoto imaging effects. The lower limit of the conditional expressions ensures that the fifth lens and the cemented group of the ninth and tenth lenses have sufficient optical power contribution to balance chromatic aberration and spherical aberration at the back end of the system; the upper limit effectively controls the front-end volume and overall length of the third lens group, thereby controlling sensitivity and field curvature and avoiding over-correction of the system to introduce advanced aberrations.

[0063] In an exemplary embodiment, the lens group satisfies: 1.90 < FG2 / LG2 < 2.45, where FG2 is the combined focal length of the second lens group, and LG2 is the axial distance from the object-side surface of the fifth lens to the image-side surface of the eighth lens. This embodiment reasonably controls the range of the above conditional expression, achieving a balance between the optical power contribution and structural compactness of the second lens group, creating favorable conditions for the light beam to enter the third lens group in a good state. The lower limit of the above conditional expression ensures that the second lens group has sufficient positive optical power to undertake the main light-gathering task of the telephoto system, while preventing excessive deflection of light within the group due to the second lens group being too long, thereby suppressing the generation of higher-order spherical aberration and coma; the upper limit limits the excessive concentration of optical power within the second lens group, reducing the sensitivity to tolerance and temperature changes, and reserving sufficient aberration compensation space for the rear lens group while taking into account the structural compactness of the second lens group.

[0064] In an exemplary embodiment, the lens group satisfies: 2.10 < F12 / R1 < 4.50, where F12 is the combined focal length of the first and second lenses, and R1 is the radius of curvature of the object-side surface of the first lens. This embodiment reasonably controls the range of the above-mentioned condition, enabling the cemented unit to achieve effective light convergence and preliminary aberration control within a limited aperture, providing a good incident foundation for the smooth entry of the beam into the subsequent lens group. The lower limit of the above-mentioned condition ensures that the cemented group composed of the first and second lenses has sufficient positive optical power to accept wide beam incidence, while limiting the radius of curvature of the object-side surface of the first lens to prevent it from being too large, thus preventing insufficient light deflection ability due to an overly flat surface and forcing excessive shift of optical power; the upper limit constrains the radius of curvature of the object-side surface of the first lens to be not too small, avoiding high-order aberrations due to excessive curvature of the surface, ensuring that the light enters the system at a gentle angle, and reducing the correction pressure of the subsequent lens group.

[0065] In an exemplary embodiment, the lens group satisfies: -0.65 < (f3 + f4) / (f1 + f2) ≤ -0.20, where f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens. This embodiment reasonably controls the range of the above conditional expression, enabling the first lens group to achieve a reasonable distribution of optical power and autonomous aberration balance within a limited space. This effectively suppresses field curvature and chromatic aberration caused by concentrated optical power, ensuring that the first lens group as a whole maintains the dominant position of positive optical power, and providing sufficient light convergence capability for the system's telephoto extension.

[0066] In an exemplary embodiment, the lens group satisfies: 2.95 < ∑CTG2 / CT8 < 3.50, where ∑CTG2 is the sum of the center thicknesses of all lenses from the fifth to the eighth lens, and CT8 is the center thickness of the eighth lens. This embodiment reasonably controls the range of the above conditional expression, enabling the second lens group to achieve a coordinated and unified thickness ratio within a limited axial space, providing structural assurance for the stable optical power performance of each lens in the group. The lower limit of the conditional expression avoids the eighth lens from being too thick in the second lens group, which could lead to local stress concentration or decreased temperature adaptability. At the same time, by distributing the thickness contribution, it ensures that each member lens has sufficient physical thickness to bear the optical power distribution, providing stable physical support for correcting spherical aberration and coma. The upper limit prevents the second lens group from encroaching on the compensation space of the rear lens group due to excessive total thickness, or from having insufficient surface stiffness and increased processing and assembly sensitivity due to the eighth lens being too thin.

[0067] In an exemplary embodiment, the lens group satisfies: 1.90 < FG3 / T89 < 2.55, where FG3 is the combined focal length of the third lens group, and T89 is the air gap between the eighth and ninth lenses on the optical axis. This embodiment reasonably controls the range of the above-mentioned conditional expression, establishing a reasonable balance between the optical power contribution of the third lens group and the front-end spacing, laying a structural foundation for the smooth entry of the beam into the group and the effective convergence. The lower limit of the conditional expression ensures that the third lens group has sufficient positive optical power to undertake the task of back-end light convergence, providing the final energy support for the system to achieve telephoto extension, while constraining the axial spacing between the eighth and ninth lenses to prevent excessively large spacing from causing redundant lens barrels and increased incident height of off-axis beams, thereby suppressing the generation of advanced astigmatism and distortion; the upper limit, by maintaining a reasonable width of the axial spacing between the eighth and ninth lenses, provides sufficient transition space for light to enter the third group after exiting the second lens group, allowing off-axis light to enter at a better angle, optimizing the edge illumination of the image plane and the field curvature correction margin.

[0068] In an exemplary embodiment, the lens group satisfies: 0.75 < FG1 / TD < 1.65, where FG1 is the combined focal length of the first lens group, and TD is the axial distance from the object-side surface of the first lens to the image-side surface of the thirteenth lens. This embodiment reasonably controls the range of the above-mentioned conditional expression, enabling the entire optical system to achieve a tiered distribution of optical power and a progressive balance of aberrations within a limited physical space, laying the foundation for the orderly transmission of light between the lens groups. The lower limit of the conditional expression ensures that the first lens group has sufficient positive optical power to undertake the task of large-angle convergence of the front-end light, providing a good wavefront basis for the telephoto extension of subsequent lens groups, while constraining the total length of the system to not be too long, preventing assembly deviations and stray light interference caused by excessive extension of the lens barrel, and ensuring the compactness and stability of the structure; the upper limit, by constraining the total length of the system to not be too short, reserves sufficient aberration compensation space and axial adjustment margin for the second and third lens groups.

[0069] In an exemplary embodiment, the lens group satisfies: 0.55 ≤ (f13 × N13) / (f12 × N12) < 1.60, where f13 is the effective focal length of the thirteenth lens, N13 is the refractive index of the thirteenth lens, f12 is the effective focal length of the twelfth lens, and N12 is the refractive index of the twelfth lens. This embodiment reasonably controls the range of the above conditional expression, establishing a good matching relationship between the twelfth and thirteenth lenses in terms of optical power distribution and material selection. This provides a stable basis for the light convergence and aberration correction of the final lens group. At the same time, by constraining the refractive index ratio, the matching of material dispersion characteristics is optimized, ensuring that light across the entire wavelength band can converge to the same image plane position in the subsequent group.

[0070] In an exemplary embodiment, the lens group satisfies: 1.20 < R14 / T78 < 2.00, where R14 is the radius of curvature of the image-side surface of the seventh lens, and T78 is the air gap between the seventh and eighth lenses on the optical axis. This embodiment reasonably controls the range of the above-mentioned conditional expression, so that the exit surface shape of the seventh lens and the rear end gap form a reasonable matching relationship, creating favorable conditions for the smooth transition of light to the subsequent lens group. The lower limit of the conditional expression can avoid excessive curvature of the surface shape, resulting in higher-order astigmatism and coma. At the same time, by maintaining a reasonable width of the gap, off-axis beams can enter the subsequent lens group at a better incident angle, optimizing the aberration correction margin of the edge field of view. The upper limit prevents insufficient optical power contribution due to excessive surface curvature radius, forcing the subsequent lenses to bear too much light-gathering burden. At the same time, it constrains the axial gap between the seventh and eighth lenses to avoid excessively narrow spacing, avoiding increased assembly sensitivity and stray light interference risks caused by excessively small spacing, and ensuring the manufacturing stability and imaging purity of the system under a compact architecture.

[0071] In an exemplary embodiment, the lens group satisfies: 2.00 < LG3 / f10 < 3.50, where LG3 is the axial distance from the object-side surface of the ninth lens to the image-side surface of the thirteenth lens, and f10 is the effective focal length of the tenth lens. This embodiment reasonably controls the range of the above-mentioned conditional expression, achieving a balance between the axial dimensions and optical power configuration of the third lens group, providing a stable structural foundation for the precise convergence of the rear beam. The lower limit of the conditional expression provides the necessary physical space for the sequential arrangement of multiple lenses, avoiding excessive light deflection due to the third lens group being too compact, thereby suppressing the accumulation of advanced astigmatism and field curvature, while ensuring that the tenth lens has sufficient positive optical power contribution to balance the negative optical power of the eleventh lens and maintain the overall light-gathering ability of the third lens group; the upper limit avoids the third lens group being too long, encroaching on the space of the front group or increasing the overall tube length, leading to a decrease in assembly sensitivity and temperature adaptability, while optimizing the optical power ratio of the tenth lens in the cemented structure, ensuring that its aberration complementarity with the ninth and eleventh lenses reaches the optimal level.

[0072] In an exemplary embodiment, the lens group satisfies: 1.60≤F91011 / |F67|≤4.05, where F91011 is the combined focal length of the ninth, tenth, and eleventh lenses, and F67 is the combined focal length of the sixth and seventh lenses. This embodiment reasonably controls the range of the above conditional expression, ensuring that the ninth, tenth, and eleventh lenses in the third lens group have appropriate optical power, while constraining the optical power of the cemented unit in the second lens group to prevent it from being too strong, avoiding the introduction of reverse aberration due to overcompensation, thereby maintaining a balance between field curvature and chromatic aberration correction, so that the front and rear optical power groups complement each other in aberration correction, ensuring that the wavefront quality after light transmission can meet the requirements for working in conjunction with the native lens of the mobile phone.

[0073] In an exemplary embodiment, the lens group satisfies: 1.00 < ∑CTG1 / ∑CTG3 < 1.65, where ∑CTG1 is the sum of the center thicknesses of all lenses from the first to the fourth lens, and ∑CTG3 is the sum of the center thicknesses of all lenses from the ninth to the thirteenth lens. This embodiment reasonably controls the range of the above conditional expression, balances the axial thickness distribution of the first and third lens groups, optimizes the energy distribution of light over the entire length, suppresses uneven thermal stress and decreased temperature adaptability caused by excessive thickness differences, and enables the front and rear groups to effectively complement each other in thickness configuration, jointly ensuring that the optical system achieves good aberration correction and stable imaging performance within a finite length.

[0074] In an exemplary embodiment, the lens group satisfies: -4.75 < (R23 + R24) / R25 < -2.25, where R23 is the radius of curvature of the object-side surface of the twelfth lens, R24 is the radius of curvature of the image-side surface of the twelfth lens, and R25 is the radius of curvature of the object-side surface of the thirteenth lens. This embodiment reasonably controls the range of the above-mentioned conditional expression, constraining a moderate difference in the bending direction between the twelfth and thirteenth lenses, so that residual astigmatism can be offset by surface shape compensation when light propagates across the lenses. At the same time, by maintaining the opposite coordination of the bending directions of the two lenses, the angle of light incident on the thirteenth lens is optimized, ensuring that the final lens group can converge the light beam to the image plane with the lowest aberration state.

[0075] In another aspect, this application provides an optical system comprising a lens assembly provided in any embodiment of this application.

[0076] In an exemplary embodiment, the optical system provided in this application may further include an imaging lens and an imaging surface located on the image side of the thirteenth lens. The outgoing light beam from the lens group enters the imaging lens to form an image on the imaging surface using the imaging lens.

[0077] In an exemplary embodiment, the optical system satisfies: -4.10 < f / FG3 < -3.60, where f is the effective focal length of the optical system and FG3 is the combined focal length of the third lens group. This embodiment reasonably controls the range of this conditional expression to ensure that the third lens group has sufficient light convergence capability, reserves sufficient aberration compensation space for the preceding lens groups, prevents the accumulation of advanced spherical aberration and chromatic aberration caused by this, and optimizes the energy distribution of light so that the light can maintain good wavefront quality after being passed through each lens group step by step, meeting the requirements of focusing accuracy, illumination uniformity and full field of view resolution when working in conjunction with the native lens of the mobile phone.

[0078] In an exemplary embodiment, the optical system satisfies: -1.45 ≤ f / (LG1+LG2) ≤ -1.01, where f is the effective focal length of the optical system, LG1 is the on-axis distance from the object-side surface of the first lens to the image-side surface of the fourth lens, and LG2 is the on-axis distance from the object-side surface of the fifth lens to the image-side surface of the eighth lens. This embodiment reasonably controls the range of this conditional expression, optimizes the tiered distribution of optical power in the first and second lens groups, ensures that the first and second lens groups contribute appropriate optical power to receive large-angle incident beams, suppresses the premature accumulation of off-axis aberrations and field curvature, and enables the first two lens groups to achieve effective convergence of light and preliminary aberration correction within a limited space, thus finding a reasonable balance between telephoto extension and structural compactness for the entire optical system.

[0079] In another aspect, this application provides an electronic device that includes the optical system provided in any embodiment of this application.

[0080] In some embodiments of this application, the imaging lens can be the native lens of an electronic device (e.g., a mobile phone, a tablet computer), and the lens group can refer to an external or additional imaging system, such as an external telephoto lens. The imaging lens is a core optical component located behind the lens group and adjacent to the image sensor along the optical axis. It is used to finally converge the light rays corrected and optimized by the front lens group to form a clear real image on the imaging surface. For example, the native lens of a mobile phone can be used to converge the light rays from an external telephoto lens, ultimately forming an image on the imaging surface. The imaging surface is, for example, the photosensitive surface of an image sensor.

[0081] Figure 1 A schematic diagram of the overall architecture of an optical system provided in this application is shown.

[0082] like Figure 1 As shown, the optical system includes a lens group 10 and an imaging lens 20. The lens group 10 and the imaging lens 20 are arranged sequentially from the object side to the image side along the optical axis. The imaging lens 20 is adjacent to the imaging surface IMG. The imaging surface IMG is, for example, the photosensitive surface of an image sensor.

[0083] Lens group 10 includes a first lens group G1, a second lens group G2, and a third lens group G3. The first lens group G1 has positive optical power, the second lens group G2 has positive optical power, and the third lens group G3 has positive optical power.

[0084] The first lens group G1 includes a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4. The first lens E1 has positive optical power, and both its object-side and image-side surfaces are convex. The second lens E2 has negative optical power, and both its object-side and image-side surfaces are concave. The third lens E3 has positive optical power, and both its object-side and image-side surfaces are convex. The fourth lens E4 has negative optical power, and both its object-side and image-side surfaces are concave.

[0085] The second lens group G2 includes a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. The fifth lens E5 has positive optical power. The sixth lens E6 has positive optical power, and its object-side surface is convex. The seventh lens E7 has negative optical power, and its image-side surface is concave. The eighth lens E8 has either positive or negative optical power, its object-side surface is concave, and its image-side surface is convex.

[0086] The third lens group G3 includes the ninth lens E9, the tenth lens E10, the eleventh lens E11, the twelfth lens E12, and the thirteenth lens E13. The ninth lens E9 has negative optical power and its image-side surface is concave. The tenth lens E10 has positive optical power and its object-side surface is convex, as is its image-side surface. The eleventh lens E11 has negative optical power and its object-side surface is concave, as is its image-side surface. The twelfth lens E12 has positive optical power and its object-side surface is concave, as is its image-side surface. The thirteenth lens has positive optical power and its object-side surface is convex.

[0087] The first and second lenses are cemented together, the third and fourth lenses are cemented together, the sixth and seventh lenses are cemented together, and the ninth and tenth lenses are cemented together; the lens group satisfies: 0.86≤f5 / T45≤4.55; 2.65≤F910 / (CT9+CT10)≤3.52; -2.75<f11 / F1213<-1.50; f5 is the effective focal length of the fifth lens, T45 is the air gap between the fourth and fifth lenses on the optical axis, F910 is the combined focal length of the ninth and tenth lenses, CT9 is the center thickness of the ninth lens, CT10 is the center thickness of the tenth lens, f11 is the effective focal length of the eleventh lens, and F1213 is the combined focal length of the twelfth and thirteenth lenses.

[0088] For example, light from an object passes sequentially through the corresponding surfaces of the first lens group G1, the second lens group G2, the third lens group G3, and the imaging lens 20, and is finally imaged on the imaging surface IMG.

[0089] The following description, with reference to the accompanying drawings, further illustrates examples of the specific surface shape and parameters of the lens group 10 applicable to the above embodiments.

[0090] Example 1

[0091] The following is for reference Figures 2-5 The lens assembly 10 according to Embodiment 1 of this application is described. Figure 2 A schematic diagram of the lens group 10 according to Embodiment 1 of this application is shown. Embodiment 1 includes 13 lenses, and the effective focal length f of the optical system is the effective focal length when adapted to an imaging lens with a focal length of 16.53mm, f=-54.41mm.

[0092] like Figure 2 As shown, the lens group 10 includes a first lens group G1, a second lens group G2, and a third lens group G3.

[0093] The first lens group G1 includes a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4.

[0094] The first lens E1 has positive optical power, the object side S1 of the first lens E1 is convex, and the image side S2 of the first lens E1 is convex.

[0095] The second lens E2 has negative optical power. The object side S2 of the second lens E2 is concave, and the image side S3 of the second lens E2 is convex.

[0096] The third lens E3 has positive optical power. The object side S4 of the third lens E3 is convex, and the image side S5 of the third lens E3 is convex.

[0097] The fourth lens E4 has negative optical power. The object side S5 of the fourth lens E4 is concave, and the image side S6 of the fourth lens E4 is concave.

[0098] The second lens group G2 includes the fifth lens E5, the sixth lens E6, the seventh lens E7, and the eighth lens E8.

[0099] The fifth lens E5 has positive optical power. The object side S7 of the fifth lens E5 is convex, and the image side S8 of the fifth lens E5 is concave.

[0100] The sixth lens E6 has positive optical power. The object side S9 of the sixth lens E6 is convex, and the image side S10 of the sixth lens E6 is convex.

[0101] The seventh lens E7 has negative optical power. The object side S10 of the seventh lens E7 is concave, and the image side S11 of the seventh lens E7 is concave.

[0102] The eighth lens E8 has positive optical power. The object side S12 of the eighth lens E8 is concave, and the image side S13 of the eighth lens E8 is convex.

[0103] The third lens group G3 includes the ninth lens E9, the tenth lens E10, the eleventh lens E11, the twelfth lens E12, and the thirteenth lens E13.

[0104] The ninth lens E9 has negative optical power. The object-side surface S14 of the ninth lens E9 is convex, and the image-side surface S15 of the ninth lens E9 is concave.

[0105] The tenth lens E10 has positive optical power. The object-side surface S15 of the tenth lens E10 is convex, and the image-side surface S16 of the tenth lens E10 is convex.

[0106] The eleventh lens E11 has negative optical power. The object-side surface S17 of the eleventh lens E11 is concave, and the image-side surface S18 of the eleventh lens E11 is convex.

[0107] The twelfth lens E12 has positive optical power. The object-side surface S19 of the twelfth lens E12 is concave, and the image-side surface S20 of the twelfth lens E12 is convex.

[0108] The thirteenth lens E13 has positive optical power. The object-side surface S21 of the thirteenth lens E13 is convex, and the image-side surface S22 of the thirteenth lens is concave.

[0109] The first lens E1 and the second lens E2 are cemented together; the third lens E3 and the fourth lens E4 are cemented together; the sixth lens E6 and the seventh lens E7 are cemented together; and the ninth lens E9 and the tenth lens E10 are cemented together.

[0110] The basic parameters of the lens group 10 in the following embodiment are shown in Table 1.

[0111] Table 1

[0112]

[0113] Figure 3 A schematic diagram of the on-axis chromatic aberration curve of the optical system of Embodiment 1 is shown. Figure 4 A schematic diagram of the astigmatism curve of the optical system of Embodiment 1 is shown. Figure 5 A schematic diagram of the distortion curve of the optical system in Embodiment 1 is shown.

[0114] according to Figure 3-5 As can be seen, the optical system given in Example 1 can achieve good imaging quality.

[0115] Example 2

[0116] The following is for reference Figures 6-9The lens assembly 10 according to Embodiment 2 of this application is described. Figure 6 A schematic diagram of the lens group 10 according to Embodiment 2 of this application is shown. Embodiment 2 includes 13 lenses, and the effective focal length f of the optical system is the effective focal length when adapted to an imaging lens with a focal length of 16.53mm, f=-54.39mm.

[0117] like Figure 6 As shown, the lens group 10 includes a first lens group G1, a second lens group G2, and a third lens group G3.

[0118] The first lens group G1 includes a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4.

[0119] The first lens E1 has positive optical power, the object side S1 of the first lens E1 is convex, and the image side S2 of the first lens E1 is convex.

[0120] The second lens E2 has negative optical power. The object side S2 of the second lens E2 is concave, and the image side S3 of the second lens E2 is concave.

[0121] The third lens E3 has positive optical power. The object side S4 of the third lens E3 is convex, and the image side S5 of the third lens E3 is convex.

[0122] The fourth lens E4 has negative optical power. The object side S5 of the fourth lens E4 is concave, and the image side S6 of the fourth lens E4 is concave.

[0123] The second lens group G2 includes the fifth lens E5, the sixth lens E6, the seventh lens E7, and the eighth lens E8.

[0124] The fifth lens E5 has positive optical power. The object side S7 of the fifth lens E5 is convex, and the image side S8 of the fifth lens E5 is concave.

[0125] The sixth lens E6 has positive optical power. The object side S9 of the sixth lens E6 is convex, and the image side S10 of the sixth lens E6 is convex.

[0126] The seventh lens E7 has negative optical power. The object side S10 of the seventh lens E7 is concave, and the image side S11 of the seventh lens E7 is concave.

[0127] The eighth lens E8 has positive optical power. The object side S12 of the eighth lens E8 is concave, and the image side S13 of the eighth lens E8 is convex.

[0128] The third lens group G3 includes the ninth lens E9, the tenth lens E10, the eleventh lens E11, the twelfth lens E12, and the thirteenth lens E13.

[0129] The ninth lens E9 has negative optical power. The object-side surface S14 of the ninth lens E9 is convex, and the image-side surface S15 of the ninth lens E9 is concave.

[0130] The tenth lens E10 has positive optical power. The object-side surface S15 of the tenth lens E10 is convex, and the image-side surface S16 of the tenth lens E10 is convex.

[0131] The eleventh lens E11 has negative optical power. The object-side surface S17 of the eleventh lens E11 is concave, and the image-side surface S18 of the eleventh lens E11 is convex.

[0132] The twelfth lens E12 has positive optical power. The object side S19 of the twelfth lens E12 is concave, and the image side S20 of the twelfth lens E12 is convex.

[0133] The thirteenth lens E13 has positive optical power. The object-side surface S21 of the thirteenth lens E13 is convex, and the image-side surface S22 of the thirteenth lens is convex.

[0134] The first lens E1 and the second lens E2 are cemented together; the third lens E3 and the fourth lens E4 are cemented together; the sixth lens E6 and the seventh lens E7 are cemented together; and the ninth lens E9 and the tenth lens E10 are cemented together.

[0135] The basic parameters of lens group 10 in Embodiment 2 are shown in Table 2.

[0136] Table 2

[0137]

[0138] Figure 7 A schematic diagram of the on-axis chromatic aberration curve of the optical system of Embodiment 2 is shown. Figure 8 A schematic diagram of the astigmatism curve of the optical system in Embodiment 2 is shown. Figure 9 A schematic diagram of the distortion curve of the optical system in Embodiment 2 is shown.

[0139] according to Figure 7-9 It can be seen that the optical system given in Example 2 can achieve good imaging quality.

[0140] Example 3

[0141] The following is for reference Figures 10-13 The lens assembly 10 according to Embodiment 3 of this application is described. Figure 10 A schematic diagram of the lens group 10 according to Embodiment 3 of this application is shown. Embodiment 3 includes 13 lenses, and the effective focal length f of the optical system is the effective focal length when adapted to an imaging lens with a focal length of 16.53mm, f=-54.40mm.

[0142] like Figure 10As shown, the lens group 10 includes a first lens group G1, a second lens group G2, and a third lens group G3.

[0143] The first lens group G1 includes a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4.

[0144] The first lens E1 has positive optical power, the object side S1 of the first lens E1 is convex, and the image side S2 of the first lens E1 is convex.

[0145] The second lens E2 has negative optical power. The object side S2 of the second lens E2 is concave, and the image side S3 of the second lens E2 is concave.

[0146] The third lens E3 has positive optical power. The object side S4 of the third lens E3 is convex, and the image side S5 of the third lens E3 is convex.

[0147] The fourth lens E4 has negative optical power. The object side S5 of the fourth lens E4 is concave, and the image side S6 of the fourth lens E4 is concave.

[0148] The second lens group G2 includes the fifth lens E5, the sixth lens E6, the seventh lens E7, and the eighth lens E8.

[0149] The fifth lens E5 has positive optical power. The object side S7 of the fifth lens E5 is convex, and the image side S8 of the fifth lens E5 is concave.

[0150] The sixth lens E6 has positive optical power. The object side S9 of the sixth lens E6 is convex, and the image side S10 of the sixth lens E6 is concave.

[0151] The seventh lens E7 has negative optical power. The object side S10 of the seventh lens E7 is convex, and the image side S11 of the seventh lens E7 is concave.

[0152] The eighth lens E8 has positive optical power. The object side S12 of the eighth lens E8 is concave, and the image side S13 of the eighth lens E8 is convex.

[0153] The third lens group G3 includes the ninth lens E9, the tenth lens E10, the eleventh lens E11, the twelfth lens E12, and the thirteenth lens E13.

[0154] The ninth lens E9 has negative optical power. The object-side surface S14 of the ninth lens E9 is concave, and the image-side surface S15 of the ninth lens E9 is concave.

[0155] The tenth lens E10 has positive optical power. The object-side surface S15 of the tenth lens E10 is convex, and the image-side surface S16 of the tenth lens E10 is convex.

[0156] The eleventh lens E11 has negative optical power. The object-side surface S17 of the eleventh lens E11 is concave, and the image-side surface S18 of the eleventh lens E11 is convex.

[0157] The twelfth lens E12 has positive optical power. The object side S19 of the twelfth lens E12 is concave, and the image side S20 of the twelfth lens E12 is convex.

[0158] The thirteenth lens E13 has positive optical power. The object-side surface S21 of the thirteenth lens E13 is convex, and the image-side surface S22 of the thirteenth lens is concave.

[0159] The first lens E1 and the second lens E2 are cemented together; the third lens E3 and the fourth lens E4 are cemented together; the sixth lens E6 and the seventh lens E7 are cemented together; and the ninth lens E9 and the tenth lens E10 are cemented together.

[0160] The basic parameters of lens group 10 in Embodiment 3 are shown in Table 3.

[0161] Table 3

[0162]

[0163] Figure 11 A schematic diagram of the on-axis chromatic aberration curve of the optical system of Embodiment 3 is shown. Figure 12 A schematic diagram of the astigmatism curve of the optical system of Embodiment 3 is shown. Figure 13 A schematic diagram of the distortion curve of the optical system in Embodiment 3 is shown.

[0164] according to Figure 11-13 As can be seen, the optical system given in Example 3 can achieve good imaging quality.

[0165] Example 4

[0166] The following is for reference Figures 14-17 The lens assembly 10 according to Embodiment 4 of this application is described. Figure 14 A schematic diagram of the lens group 10 of Embodiment 4 provided in this application is shown. Embodiment 4 includes 13 lenses, and the effective focal length f of the optical system is the effective focal length when adapted to an imaging lens with a focal length of 16.53mm, f=-54.39mm.

[0167] like Figure 14 As shown, the lens group 10 includes a first lens group G1, a second lens group G2, and a third lens group G3.

[0168] The first lens group G1 includes a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4.

[0169] The first lens E1 has positive optical power, the object side S1 of the first lens E1 is convex, and the image side S2 of the first lens E1 is convex.

[0170] The second lens E2 has negative optical power. The object side S2 of the second lens E2 is concave, and the image side S3 of the second lens E2 is concave.

[0171] The third lens E3 has positive optical power. The object side S4 of the third lens E3 is convex, and the image side S5 of the third lens E3 is convex.

[0172] The fourth lens E4 has negative optical power. The object side S5 of the fourth lens E4 is concave, and the image side S6 of the fourth lens E4 is concave.

[0173] The second lens group G2 includes the fifth lens E5, the sixth lens E6, the seventh lens E7, and the eighth lens E8.

[0174] The fifth lens E5 has positive optical power. The object side S7 of the fifth lens E5 is convex, and the image side S8 of the fifth lens E5 is concave.

[0175] The sixth lens E6 has positive optical power. The object side S9 of the sixth lens E6 is convex, and the image side S10 of the sixth lens E6 is concave.

[0176] The seventh lens E7 has negative optical power. The object side S10 of the seventh lens E7 is convex, and the image side S11 of the seventh lens E7 is concave.

[0177] The eighth lens E8 has positive optical power. The object side S12 of the eighth lens E8 is concave, and the image side S13 of the eighth lens E8 is convex.

[0178] The third lens group G3 includes the ninth lens E9, the tenth lens E10, the eleventh lens E11, the twelfth lens E12, and the thirteenth lens E13.

[0179] The ninth lens E9 has negative optical power. The object-side surface S14 of the ninth lens E9 is concave, and the image-side surface S15 of the ninth lens E9 is concave.

[0180] The tenth lens E10 has positive optical power. The object-side surface S15 of the tenth lens E10 is convex, and the image-side surface S16 of the tenth lens E10 is convex.

[0181] The eleventh lens E11 has negative optical power. The object-side surface S17 of the eleventh lens E11 is concave, and the image-side surface S18 of the eleventh lens E11 is convex.

[0182] The twelfth lens E12 has positive optical power. The object side S19 of the twelfth lens E12 is concave, and the image side S20 of the twelfth lens E12 is convex.

[0183] The thirteenth lens E13 has positive optical power. The object-side surface S21 of the thirteenth lens E13 is convex, and the image-side surface S22 of the thirteenth lens is concave.

[0184] The first lens E1 and the second lens E2 are cemented together; the third lens E3 and the fourth lens E4 are cemented together; the sixth lens E6 and the seventh lens E7 are cemented together; and the ninth lens E9 and the tenth lens E10 are cemented together.

[0185] The basic parameters of lens group 10 in Embodiment 4 are shown in Table 4.

[0186] Table 4

[0187]

[0188] Figure 15 A schematic diagram of the on-axis chromatic aberration curve of the optical system of Embodiment 4 is shown. Figure 16 A schematic diagram of the astigmatism curve of the optical system of Embodiment 4 is shown. Figure 17 A schematic diagram of the distortion curve of the optical system in Embodiment 4 is shown.

[0189] according to Figure 15-17 As can be seen, the optical system given in Example 4 can achieve good imaging quality.

[0190] Example 5

[0191] The following is for reference Figures 18-21 The lens assembly 10 according to Embodiment 5 of this application is described. Figure 18 A schematic diagram of the lens group 10 of Embodiment 5 provided in this application is shown. Embodiment 5 includes 13 lenses, and the effective focal length f of the optical system is the effective focal length when adapted to an imaging lens with a focal length of 16.53mm, f=-54.39mm.

[0192] like Figure 18 As shown, the lens group 10 includes a first lens group G1, a second lens group G2, and a third lens group G3.

[0193] The first lens group G1 includes a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4.

[0194] The first lens E1 has positive optical power, the object side S1 of the first lens E1 is convex, and the image side S2 of the first lens E1 is convex.

[0195] The second lens E2 has negative optical power. The object side S2 of the second lens E2 is concave, and the image side S3 of the second lens E2 is convex.

[0196] The third lens E3 has positive optical power. The object side S4 of the third lens E3 is convex, and the image side S5 of the third lens E3 is convex.

[0197] The fourth lens E4 has negative optical power. The object side S5 of the fourth lens E4 is concave, and the image side S6 of the fourth lens E4 is concave.

[0198] The second lens group G2 includes the fifth lens E5, the sixth lens E6, the seventh lens E7, and the eighth lens E8.

[0199] The fifth lens E5 has positive optical power. The object side S7 of the fifth lens E5 is convex, and the image side S8 of the fifth lens E5 is convex.

[0200] The sixth lens E6 has positive optical power. The object side S9 of the sixth lens E6 is convex, and the image side S10 of the sixth lens E6 is concave.

[0201] The seventh lens E7 has negative optical power. The object side S10 of the seventh lens E7 is convex, and the image side S11 of the seventh lens E7 is concave.

[0202] The eighth lens E8 has positive optical power. The object side S12 of the eighth lens E8 is concave, and the image side S13 of the eighth lens E8 is convex.

[0203] The third lens group G3 includes the ninth lens E9, the tenth lens E10, the eleventh lens E11, the twelfth lens E12, and the thirteenth lens E13.

[0204] The ninth lens E9 has negative optical power. The object-side surface S14 of the ninth lens E9 is concave, and the image-side surface S15 of the ninth lens E9 is concave.

[0205] The tenth lens E10 has positive optical power. The object-side surface S15 of the tenth lens E10 is convex, and the image-side surface S16 of the tenth lens E10 is convex.

[0206] The eleventh lens E11 has negative optical power. The object-side surface S17 of the eleventh lens E11 is concave, and the image-side surface S18 of the eleventh lens E11 is convex.

[0207] The twelfth lens E12 has positive optical power. The object side S19 of the twelfth lens E12 is concave, and the image side S20 of the twelfth lens E12 is convex.

[0208] The thirteenth lens E13 has positive optical power. The object-side surface S21 of the thirteenth lens E13 is convex, and the image-side surface S22 of the thirteenth lens is concave.

[0209] The first lens E1 and the second lens E2 are cemented together; the third lens E3 and the fourth lens E4 are cemented together; the sixth lens E6 and the seventh lens E7 are cemented together; and the ninth lens E9 and the tenth lens E10 are cemented together.

[0210] The basic parameters of lens group 10 in Embodiment 5 are shown in Table 5.

[0211] Table 5

[0212]

[0213] Figure 19 A schematic diagram of the on-axis chromatic aberration curve of the optical system of Embodiment 5 is shown. Figure 20 A schematic diagram of the astigmatism curve of the optical system of Embodiment 5 is shown. Figure 21 A schematic diagram of the distortion curve of the optical system in Embodiment 5 is shown.

[0214] according to Figure 19-21 As can be seen, the optical system given in Example 5 can achieve good imaging quality.

[0215] Example 6

[0216] The following is for reference Figures 22-25 The lens assembly 10 according to Embodiment Six of this application is described. Figure 22 A schematic diagram of the lens group 10 of Embodiment Six provided in this application is shown. Embodiment Six includes 13 lenses, and the effective focal length f of the optical system is the effective focal length when adapted to an imaging lens with a focal length of 16.53mm, f=-54.39mm.

[0217] like Figure 22 As shown, the lens group 10 includes a first lens group G1, a second lens group G2, and a third lens group G3.

[0218] The first lens group G1 includes a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4.

[0219] The first lens E1 has positive optical power, the object side S1 of the first lens E1 is convex, and the image side S2 of the first lens E1 is convex.

[0220] The second lens E2 has negative optical power. The object side S2 of the second lens E2 is concave, and the image side S3 of the second lens E2 is convex.

[0221] The third lens E3 has positive optical power. The object side S4 of the third lens E3 is convex, and the image side S5 of the third lens E3 is convex.

[0222] The fourth lens E4 has negative optical power. The object side S5 of the fourth lens E4 is concave, and the image side S6 of the fourth lens E4 is concave.

[0223] The second lens group G2 includes the fifth lens E5, the sixth lens E6, the seventh lens E7, and the eighth lens E8.

[0224] The fifth lens E5 has positive optical power. The object side S7 of the fifth lens E5 is concave, and the image side S8 of the fifth lens E5 is convex.

[0225] The sixth lens E6 has positive optical power. The object side S9 of the sixth lens E6 is convex, and the image side S10 of the sixth lens E6 is concave.

[0226] The seventh lens E7 has negative optical power. The object side S10 of the seventh lens E7 is convex, and the image side S11 of the seventh lens E7 is concave.

[0227] The eighth lens E8 has negative optical power. The object side S12 of the eighth lens E8 is concave, and the image side S13 of the eighth lens E8 is convex.

[0228] The third lens group G3 includes the ninth lens E9, the tenth lens E10, the eleventh lens E11, the twelfth lens E12, and the thirteenth lens E13.

[0229] The ninth lens E9 has negative optical power. The object-side surface S14 of the ninth lens E9 is concave, and the image-side surface S15 of the ninth lens E9 is concave.

[0230] The tenth lens E10 has positive optical power. The object-side surface S15 of the tenth lens E10 is convex, and the image-side surface S16 of the tenth lens E10 is convex.

[0231] The eleventh lens E11 has negative optical power. The object-side surface S17 of the eleventh lens E11 is concave, and the image-side surface S18 of the eleventh lens E11 is convex.

[0232] The twelfth lens E12 has positive optical power. The object side S19 of the twelfth lens E12 is concave, and the image side S20 of the twelfth lens E12 is convex.

[0233] The thirteenth lens E13 has positive optical power. The object-side surface S21 of the thirteenth lens E13 is convex, and the image-side surface S22 of the thirteenth lens is concave.

[0234] The first lens E1 and the second lens E2 are cemented together; the third lens E3 and the fourth lens E4 are cemented together; the sixth lens E6 and the seventh lens E7 are cemented together; and the ninth lens E9 and the tenth lens E10 are cemented together.

[0235] The basic parameters of lens group 10 in Embodiment 6 are shown in Table 6.

[0236] Table 6

[0237]

[0238] Figure 23 A schematic diagram of the on-axis chromatic aberration curve of the optical system of Embodiment Six is ​​shown. Figure 24 A schematic diagram of the astigmatism curve of the optical system of Embodiment Six is ​​shown. Figure 25 A schematic diagram of the distortion curve of the optical system of Embodiment Six is ​​shown.

[0239] according to Figure 23-25 As can be seen, the optical system given in Example 6 can achieve good imaging quality.

[0240] Some optical parameters of Examples 1 to 6 are shown in Table 7 (unit: mm). The conditions satisfied by Examples 1 to 6 are shown in Table 8.

[0241] Table 7

[0242]

[0243] Table 8

[0244]

[0245] In addition, this application also provides an optical system including a lens group provided in any embodiment of this application.

[0246] Furthermore, this application also provides an electronic device that includes the optical system provided in any embodiment of this application. The electronic device is, for example, a mobile phone, which may include an imaging lens and lens assemblies from various embodiments.

[0247] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of protection involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the concept of this application. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A lens assembly, wherein the lens assembly comprises, sequentially from the object side to the image side along the optical axis, a first lens assembly, a second lens assembly, and a third lens assembly, characterized in that, The first lens group has positive optical power, and the first lens group includes: A first lens having positive optical power, wherein the object-side surface of the first lens is convex and the image-side surface of the first lens is convex. A second lens having negative optical power, wherein the object side of the second lens is concave; A third lens having positive optical power, wherein the object-side surface of the third lens is convex and the image-side surface of the third lens is convex; A fourth lens with negative optical power, wherein the object-side surface of the fourth lens is concave and the image-side surface of the fourth lens is concave. The second lens group has positive optical power, and the second lens group includes: A fifth lens with positive optical power; A sixth lens having positive optical power, wherein the object-side surface of the sixth lens is convex; A seventh lens with negative optical power, wherein the image-side surface of the seventh lens is concave; An eighth lens having positive or negative optical power, wherein the object-side surface of the eighth lens is concave and the image-side surface of the eighth lens is convex. The third lens group has positive optical power, and the third lens group includes: A ninth lens having negative optical power, wherein the image-side surface of the ninth lens is concave; A tenth lens with positive optical power, wherein the object-side surface of the tenth lens is convex and the image-side surface of the tenth lens is convex. An eleventh lens with negative optical power, wherein the object-side surface of the eleventh lens is concave and the image-side surface of the eleventh lens is convex. A twelfth lens with positive optical power, wherein the object-side surface of the twelfth lens is concave and the image-side surface of the twelfth lens is convex; A thirteenth lens with positive optical power, wherein the object-side surface of the thirteenth lens is convex. Wherein, the first lens and the second lens are cemented together, the third lens and the fourth lens are cemented together, the sixth lens and the seventh lens are cemented together, and the ninth lens and the tenth lens are cemented together; The lens group satisfies: 0.86≤f5 / T45≤4.55; 2.65≤F910 / (CT9+CT10)≤3.52; -2.75<f11 / F1213<-1.50; Wherein, f5 is the effective focal length of the fifth lens, T45 is the air gap between the fourth and fifth lenses on the optical axis, F910 is the combined focal length of the ninth and tenth lenses, CT9 is the center thickness of the ninth lens, CT10 is the center thickness of the tenth lens, f11 is the effective focal length of the eleventh lens, and F1213 is the combined focal length of the twelfth and thirteenth lenses.

2. The lens assembly according to claim 1, characterized in that, The lens group satisfies: 1.90 < FG2 / LG2 < 2.45, where FG2 is the combined focal length of the second lens group, and LG2 is the on-axis distance from the object side of the fifth lens to the image side of the eighth lens.

3. The lens assembly according to claim 1, characterized in that, The lens group satisfies: 2.10 < F12 / R1 < 4.50, where F12 is the combined focal length of the first lens and the second lens, and R1 is the radius of curvature of the object side surface of the first lens.

4. The lens assembly according to claim 1, characterized in that, The lens group satisfies: -0.65 < (f3 + f4) / (f1 + f2) ≤ -0.20, where f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens.

5. The lens assembly according to claim 1, characterized in that, The lens group satisfies: 2.95 < ∑CTG2 / CT8 < 3.50, where ∑CTG2 is the sum of the center thicknesses of all lenses from the fifth lens to the eighth lens, and CT8 is the center thickness of the eighth lens.

6. The lens assembly according to claim 1, characterized in that, The lens group satisfies: 1.90 < FG3 / T89 < 2.55, where FG3 is the combined focal length of the third lens group, and T89 is the air gap between the eighth lens and the ninth lens on the optical axis.

7. The lens assembly according to claim 1, characterized in that, The lens group satisfies: 0.75 < FG1 / TD < 1.65, where FG1 is the combined focal length of the first lens group, and TD is the on-axis distance from the object side of the first lens to the image side of the thirteenth lens.

8. The lens assembly according to claim 1, characterized in that, The lens group satisfies: 0.55≤(f13×N13) / (f12×N12)<1.60, where f13 is the effective focal length of the thirteenth lens, N13 is the refractive index of the thirteenth lens, f12 is the effective focal length of the twelfth lens, and N12 is the refractive index of the twelfth lens.

9. The lens assembly according to claim 1, characterized in that, The lens group satisfies: 1.20 < R14 / T78 < 2.00, where R14 is the radius of curvature of the image side of the seventh lens, and T78 is the air gap between the seventh lens and the eighth lens on the optical axis.

10. The lens assembly according to claim 1, characterized in that, The lens group satisfies: 2.00 < LG3 / f10 < 3.50, where LG3 is the axial distance from the object side of the ninth lens to the image side of the thirteenth lens, and f10 is the effective focal length of the tenth lens.

11. The lens assembly according to claim 1, characterized in that, The lens group satisfies: 1.60≤F91011 / |F67|≤4.05, where F91011 is the combined focal length of the ninth lens, the tenth lens and the eleventh lens, and F67 is the combined focal length of the sixth lens and the seventh lens.

12. The lens assembly according to claim 1, characterized in that, The lens group satisfies: 1.00 < ∑CTG1 / ∑CTG3 < 1.65, where ∑CTG1 is the sum of the center thicknesses of all lenses from the first lens to the fourth lens, and ∑CTG3 is the sum of the center thicknesses of all lenses from the ninth lens to the thirteenth lens.

13. The lens assembly according to claim 1, characterized in that, The lens group satisfies: -4.75 < (R23 + R24) / R25 < -2.25, where R23 is the radius of curvature of the object side of the twelfth lens, R24 is the radius of curvature of the image side of the twelfth lens, and R25 is the radius of curvature of the object side of the thirteenth lens.

14. An optical system, characterized in that, Includes the lens assembly according to any one of claims 1-13.

15. The optical system according to claim 14, characterized in that, The optical system also includes an imaging lens and an imaging surface located on the image side of the thirteenth lens. The outgoing light beam from the lens group enters the imaging lens to form an image on the imaging surface using the imaging lens.

16. The optical system according to claim 15, characterized in that, The optical system satisfies: -4.10 < f / FG3 < -3.60, where f is the effective focal length of the optical system and FG3 is the combined focal length of the third lens group.

17. The optical system according to claim 15, characterized in that, The optical system satisfies: -1.45≤f / (LG1+LG2)≤-1.01, where f is the effective focal length of the optical system, LG1 is the axial distance from the object side of the first lens to the image side of the fourth lens, and LG2 is the axial distance from the object side of the fifth lens to the image side of the eighth lens.

18. An electronic device, characterized in that, Includes the optical system according to any one of claims 14-17.

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