Lens set, optical system, and electronic device

Abstract

This application provides a lens group, an optical system, and an electronic device. The lens group includes a first lens group, a second lens group, and a third lens group. The first lens group includes a first to a fifth lens; the second lens group includes a sixth to a tenth lens; and the third lens group includes an eleventh to a fifteenth lens. The effective focal lengths are: 3.31 ≤ f12 / (CT11+CT12) ≤ 5.40; -3.70 < f14 / (CT13+CT14) < -2.30; 4.05 < FG3 / CT15 < 8.75; f12 is the effective focal length of the twelfth lens; CT11, CT12, CT13, CT14, and CT15 are the center thicknesses of the eleventh to fifteenth lenses, respectively; f14 is the effective focal length of the fourteenth lens; and FG3 is the combined focal length of the third lens group. The lens group achieves a comprehensive balance in terms of high image quality across the entire field of view, compact structure, and environmental adaptability.

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] As mobile devices (such as high-end smartphones) increasingly demand higher photographic performance, periscope telephoto lenses have become standard equipment. However, limited by internal space, their optical zoom capabilities are limited, making it difficult to meet the needs of ultra-telephoto scenarios. To address this, extension lenses have emerged. However, traditional extension lenses often use simple lens groups, which easily introduce aberrations and chromatic aberration when connected to mobile devices, leading to decreased edge resolution, loss of contrast, and other optical performance degradation, failing to fully utilize the imaging capabilities of the original lens on the mobile device. Therefore, there is an urgent need for an extension lens group that can be well-matched with periscope telephoto lenses and maintain excellent optical performance after connection. Summary of the Invention

[0003] One aspect of this application provides a lens assembly, which includes a first lens group, a second lens group, and a third lens group sequentially from the object side to the image side along the optical axis. 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 positive optical power, the object side of the second lens being convex and the image side of the second lens being convex; a third lens with negative optical power, the object side of the third lens being concave and the image side of the third lens being concave; and a fourth lens with positive optical power, the object side of the fourth lens being convex and the image side of the fourth lens being concave. The first lens group has a convex side surface; 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 concave; the second lens group has either positive or negative optical power, and includes: a sixth lens with positive optical power, wherein the image-side surface of the sixth lens is convex; a seventh lens with positive optical power, wherein the object-side surface of the seventh lens is convex and the image-side surface of the seventh lens is concave; an eighth lens with negative optical power, wherein the object-side surface of the eighth lens is convex and the image-side surface of the eighth lens is concave; a ninth lens with negative optical power, wherein the object-side surface of the ninth lens is concave and the image-side surface of the ninth lens is concave; and a tenth lens with positive optical power. The third lens group has positive optical power and includes: an eleventh lens with negative optical power, the object-side surface of the eleventh lens being concave; a twelfth lens with positive optical power, the image-side surface of the twelfth lens being convex; a thirteenth lens with positive optical power, the image-side surface of the thirteenth lens being convex; a fourteenth lens with negative optical power, the object-side surface of the fourteenth lens being concave; and a fifteenth lens with positive optical power, the object-side surface of the fifteenth lens being convex, and the image-side surface of the fifteenth lens being convex. The second lens and the third lens are cemented together; the fourth lens and the fifth lens are cemented together; the eleventh lens and the twelfth lens are cemented together; and the third lens... The thirteenth lens and the fourteenth lens are cemented together, and satisfy the following conditions: 3.31≤f12 / (CT11+CT12)≤5.40; -3.70<f14 / (CT13+CT14)<-2.30; 4.05<FG3 / CT15<8.75; f12 is the effective focal length of the twelfth lens, CT11 is the center thickness of the eleventh lens, CT12 is the center thickness of the twelfth lens, f14 is the effective focal length of the fourteenth lens, CT13 is the center thickness of the thirteenth lens, CT14 is the center thickness of the fourteenth lens, FG3 is the combined focal length of the third lens group, and CT15 is the center thickness of the fifteenth lens.

[0004] According to an embodiment of this application, the lens group satisfies: -3.40 < F23 / f1 ≤ -2.70, where F23 is the combined focal length of the second lens and the third lens, and f1 is the effective focal length of the first lens.

[0005] According to an embodiment of this application, the lens group satisfies: 4.00≤|FG2| / T1011≤10.75, where FG2 is the combined focal length of the second lens group, and T1011 is the air gap between the tenth lens and the eleventh lens on the optical axis.

[0006] According to an embodiment of this application, the lens group satisfies: 1.70 < (R3 + R6) / f2 < 2.15, where R3 is the radius of curvature of the object side of the second lens, R6 is the radius of curvature of the image side of the third lens, and f2 is the effective focal length of the second lens.

[0007] According to an embodiment of this application, the lens group satisfies: 3.80 < F123 / f15 < 6.30, where F123 is the combined focal length of the first lens, the second lens, and the third lens, and f15 is the effective focal length of the fifteenth lens.

[0008] According to an embodiment of this application, the lens group satisfies: -1.20 < LG2 / (f8+f9) < -0.75, where LG2 is the axial distance from the object side of the sixth lens to the image side of the tenth lens, f8 is the effective focal length of the eighth lens, and f9 is the effective focal length of the ninth lens.

[0009] According to an embodiment of this application, the lens group satisfies: -3.40 < (R1 + R2) / FG1 < -1.95, where R1 is the radius of curvature of the object side of the first lens, R2 is the radius of curvature of the image side of the first lens, and FG1 is the combined focal length of the first lens group.

[0010] According to an embodiment of this application, the lens group satisfies: 8.80 < F67 / T78 < 11.40, where F67 is the combined focal length of the sixth lens and the seventh lens, and T78 is the air gap between the seventh lens and the eighth lens on the optical axis.

[0011] According to an embodiment of this application, the lens group satisfies: -3.65≤f10 / F89<-2.10, where f10 is the effective focal length of the tenth lens and F89 is the combined focal length of the eighth and ninth lenses.

[0012] According to an embodiment of this application, the lens group satisfies: -1.45 < (f14 × N14) / (f13 × N13) < -0.75, where f14 is the effective focal length of the fourteenth lens, N14 is the refractive index of the fourteenth lens, f13 is the effective focal length of the thirteenth lens, and N13 is the refractive index of the thirteenth lens.

[0013] According to an embodiment of this application, the lens group satisfies: 4.75≤TD / LG3<7.05, where TD is the axial distance from the object side of the first lens to the image side of the fifteenth lens, and LG3 is the axial distance from the object side of the eleventh lens to the image side of the fifteenth lens.

[0014] According to an embodiment of this application, the lens group satisfies: 2.65 < ∑CTG1 / (CT2+CT3) ≤ 3.35, where ∑CTG1 is the sum of the center thicknesses of all lenses from the first lens to the fifth lens, CT2 is the center thickness of the second lens, and CT3 is the center thickness of the third lens.

[0015] According to an embodiment of this application, the lens group satisfies: 2.15≤f7 / ∑CTG2<5.80, where f7 is the effective focal length of the seventh lens, and ∑CTG2 is the sum of the center thicknesses of all lenses from the sixth lens to the tenth lens.

[0016] According to an embodiment of this application, the lens group satisfies: 1.25 < F131415 / ∑CTG3 < 2.55, where F131415 is the combined focal length of the thirteenth lens, the fourteenth lens, and the fifteenth lens, and ∑CTG3 is the sum of the center thicknesses of all lenses from the eleventh lens to the fifteenth lens.

[0017] According to an embodiment of this application, the lens group satisfies: 1.50 < R10 / LG1 < 2.95, where R10 is the radius of curvature of the image-side surface of the fifth lens, and LG1 is the axial distance from the object-side surface of the first lens to the image-side surface of the fifth lens.

[0018] Another aspect of the embodiments of this application provides an optical system that includes a lens group provided in any embodiment of this application.

[0019] 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 fifteenth 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.

[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, and through the synergistic constraints of three conditional expressions—3.31≤f12 / (CT11+CT12)≤5.40, -3.70<f14 / (CT13+CT14)<-2.30, and 4.05<FG3 / CT15<8.75—a comprehensive balance is achieved in terms of high image quality across the entire field of view, compact structure, and environmental adaptability. The lower limit of the above conditional expressions ensures that the twelfth and fourteenth lenses have sufficient optical power to converge light and correct field curvature, while providing ample margin for chromatic aberration correction and cemented lens assembly processing; the upper limit of the above conditional expressions suppresses advanced spherical aberration and astigmatism caused by excessive optical power, controls image plane flatness, and reduces assembly sensitivity, while constraining the total length of the lens group, reserving a safety margin for thermal expansion, and ensuring mass production stability. 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. Figure 2 A schematic diagram of the lens assembly of Embodiment 1 provided in this application is shown; 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; Figure 6 A schematic diagram of the lens assembly of Embodiment 2 provided in this application is shown; 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; Figure 10 A schematic diagram of the lens assembly of Embodiment 3 provided in this application is shown; 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 in Embodiment 3 is shown; Figure 13 A schematic diagram of the distortion curve of the optical system in Embodiment 3 is shown; Figure 14 A schematic diagram of the lens assembly of Embodiment 4 provided in this application is shown; 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; Figure 18 A schematic diagram of the lens assembly of Embodiment 5 provided in this application is shown; 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; Figure 22 A schematic diagram of the lens assembly of Embodiment Six provided in this application is shown; 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; Figure 26 A schematic diagram of the lens assembly of Embodiment Seven provided in this application is shown; Figure 27 A schematic diagram of the on-axis chromatic aberration curve of the optical system of Embodiment Seven is shown; Figure 28 A schematic diagram of the astigmatism curve of the optical system of Embodiment Seven is shown; and Figure 29 A schematic diagram of the distortion curve of the optical system of Embodiment 7 is shown. Detailed Implementation

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] The features, principles and other aspects of this application are described in detail below.

[0032] 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.

[0033] 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 positive optical power, the object side of the second lens being convex and the image side of the second lens being convex; a third lens with negative optical power, the object side of the third lens being concave and the image side of the third lens being concave; a fourth lens with positive optical power, the object side of the fourth lens being convex and the image side of the fourth lens being convex; and a fifth lens with negative optical power, the object side of the fifth lens being concave and the image side of the fifth lens being concave.

[0034] The second lens group has either positive or negative optical power, and includes: a sixth lens with positive optical power, the image-side surface of the sixth lens being convex; a seventh lens with positive optical power, the object-side surface of the seventh lens being convex and the image-side surface of the seventh lens being concave; an eighth lens with negative optical power, the object-side surface of the eighth lens being convex and the image-side surface of the eighth lens being concave; a ninth lens with negative optical power, the object-side surface of the ninth lens being concave and the image-side surface of the ninth lens being concave; and a tenth lens with positive optical power.

[0035] The third lens group has positive optical power and includes: an eleventh lens with negative optical power, the object side of which is concave; a twelfth lens with positive optical power, the image side of which is convex; a thirteenth lens with positive optical power, the image side of which is convex; a fourteenth lens with negative optical power, the object side of which is concave; and a fifteenth lens with positive optical power, the object side of which is convex, and the image side of which is convex.

[0036] The second and third lenses are cemented together, the fourth and fifth lenses are cemented together, the eleventh and twelfth lenses are cemented together, and the thirteenth and fourteenth lenses are cemented together.

[0037] The lens group satisfies: 3.31≤f12 / (CT11+CT12)≤5.40; -3.70<f14 / (CT13+CT14)<-2.30; 4.05<FG3 / CT15<8.75; f12 is the effective focal length of the twelfth lens, CT11 is the center thickness of the eleventh lens, CT12 is the center thickness of the twelfth lens, f14 is the effective focal length of the fourteenth lens, CT13 is the center thickness of the thirteenth lens, CT14 is the center thickness of the fourteenth lens, FG3 is the combined focal length of the third lens group, and CT15 is the center thickness of the fifteenth lens.

[0038] The lens assembly provided in this application achieves a comprehensive balance in terms of high image quality across the entire field of view, compact structure, and environmental adaptability through the synergistic constraints of three conditional constraints: 3.31≤f12 / (CT11+CT12)≤5.40, -3.70<f14 / (CT13+CT14)<-2.30, and 4.05<FG3 / CT15<8.75. The lower limit of the conditional constraints ensures that the twelfth and fourteenth lenses have sufficient optical power to converge light and correct field curvature, while providing ample margin for chromatic aberration correction and cemented lens assembly processing. The upper limit of the conditional constraints suppresses advanced spherical aberration and astigmatism caused by excessive optical power, controls image plane flatness, and reduces assembly sensitivity. At the same time, it constrains the overall length of the lens assembly, reserves a safety margin for thermal expansion, and ensures mass production stability.

[0039] In an exemplary embodiment, the lens group satisfies: -3.40 < F23 / f1 ≤ -2.70, where F23 is the combined focal length of the second and third lenses, and f1 is the effective focal length of the first lens. This embodiment reasonably controls the range of the above-mentioned conditional expression, enabling the cemented lens group of the second and third lenses to provide a moderate negative optical power, effectively correcting chromatic aberration and spherical aberration, and avoiding increased sensitivity. This range also balances the positive optical power of the first lens, ensuring uniform image quality across the entire field of view, which is key to achieving high resolution and high yield.

[0040] In an exemplary embodiment, the lens group satisfies: 4.00 ≤ |FG2| / T1011 ≤ 10.75, where FG2 is the combined focal length of the second lens group, and T1011 is the air gap between the tenth and eleventh lenses on the optical axis. This embodiment reasonably controls the range of the above conditional expression, ensuring both light-gathering efficiency and aberration correction space, while suppressing higher aberrations and body length, which is beneficial for balancing imaging performance and assembly tolerance, and improving environmental adaptability.

[0041] In an exemplary embodiment, the lens group satisfies: 1.70 < (R3 + R6) / f2 < 2.15, where R3 is the radius of curvature of the object-side surface of the second lens, R6 is the radius of curvature of the image-side surface of the third lens, and f2 is the effective focal length of the second lens. This embodiment reasonably controls the range of the above-mentioned conditional expression, so that the surface shape and optical power of the cemented lens group of the second and third lenses are synergistically optimized, which can significantly reduce spherical aberration and coma, and avoid the manufacturing difficulties caused by excessive curvature. It is beneficial to obtain uniform high resolution across the entire field of view, while improving mass production feasibility.

[0042] In an exemplary embodiment, the lens group satisfies: 3.80 < F123 / f15 < 6.30, where F123 is the combined focal length of the first, second, and third lenses, and f15 is the effective focal length of the fifteenth lens. This embodiment reasonably controls the range of the above conditional expression, ensuring a reasonable match between the converging capability of the front lens group and the optical power of the rear lens group. This guarantees light convergence efficiency while suppressing higher-order aberrations introduced by the excessive optical power of the fifteenth lens. Simultaneously, it optimizes field curvature and temperature drift control, which is beneficial for achieving high resolution and stable mass production yield across full-frame sensors.

[0043] In an exemplary embodiment, the lens group satisfies: -1.20 < LG2 / (f8 + f9) < -0.75, where LG2 is the axial distance from the object-side surface of the sixth lens to the image-side surface of the tenth lens, f8 is the effective focal length of the eighth lens, and f9 is the effective focal length of the ninth lens. This embodiment reasonably controls the range of the above conditional expression, matching the internal space of the second lens group with the optical power of the key lenses. This effectively suppresses stray light and assembly errors, ensures a smooth light path, avoids redundant spans within the group, and improves the cleanliness and sharpness of the image.

[0044] In an exemplary embodiment, the lens group satisfies: -3.40 < (R1 + R2) / FG1 < -1.95, where R1 is the radius of curvature of the object-side surface of the first lens, R2 is the radius of curvature of the image-side surface of the first lens, and FG1 is the combined focal length of the first lens group. This embodiment reasonably controls the range of the above conditional expression, so that the surface curvature of the first lens matches the focal length of the first lens group, which can effectively reduce the refractive stress of light on the first surface, suppress spherical aberration and control the angle of incidence, while optimizing the principal surface position and ensuring high transmittance and illumination uniformity of the system.

[0045] In an exemplary embodiment, the lens group satisfies: 8.80 < F67 / T78 < 11.40, where F67 is the combined focal length of the sixth and seventh lenses, and T78 is the air gap between the seventh and eighth lenses on the optical axis. This embodiment reasonably controls the above conditional range, ensuring smooth light transition, effectively suppressing ghosting and local field curvature, while optimizing the connection efficiency between lenses within the second lens group, improving contrast performance and production tolerance.

[0046] In an exemplary embodiment, the lens group satisfies: -3.65 ≤ f10 / F89 < -2.10, where f10 is the effective focal length of the tenth lens, and F89 is the combined focal length of the eighth and ninth lenses. This embodiment reasonably controls the range of the above conditional expression, which can actively compensate for coma and astigmatism, avoid aperture expansion, and optimize aberration distribution, which is beneficial to shortening the total length of the lens group and improving the consistency of depth of focus.

[0047] In an exemplary embodiment, the lens group satisfies: -1.45 < (f14 × N14) / (f13 × N13) < -0.75, where f14 is the effective focal length of the fourteenth lens, N14 is the refractive index of the fourteenth lens, f13 is the effective focal length of the thirteenth lens, and N13 is the refractive index of the thirteenth lens. This embodiment reasonably controls the range of the above conditional expression, which can efficiently correct transverse chromatic aberration and secondary spectrum, reduce bonding interface stress, and suppress magnification chromatic aberration, thus ensuring the color purity and edge resolution of the full-frame image.

[0048] In an exemplary embodiment, the lens group satisfies: 4.75 ≤ TD / LG3 < 7.05, where TD is the axial distance from the object-side surface of the first lens to the image-side surface of the fifteenth lens, and LG3 is the axial distance from the object-side surface of the eleventh lens to the image-side surface of the fifteenth lens. This embodiment reasonably controls the range of the above conditional expression, which can avoid pupil drift caused by excessive length of the front lens group, while ensuring that the rear lens group has sufficient space to converge off-axis light rays. It also improves illumination uniformity and packaging integration, and is beneficial for passing drop and temperature shock tests.

[0049] In an exemplary embodiment, the lens group satisfies: 2.65 < ∑CTG1 / (CT2+CT3) ≤ 3.35, where ∑CTG1 is the sum of the center thicknesses of all lenses from the first lens to the fifth lens, CT2 is the center thickness of the second lens, and CT3 is the center thickness of the third lens. This embodiment reasonably controls the range of the above conditional expression, so that the total thickness of the first lens group is coordinated with the thickness of the cemented lens group of the second and third lenses, avoiding overload or space waste of the cemented lens group, while optimizing the thermal matching of the first lens group, ensuring focal plane stability and imaging consistency over a wide temperature range.

[0050] In an exemplary embodiment, the lens group satisfies: 2.15 ≤ f7 / ∑CTG2 < 5.80, where f7 is the effective focal length of the seventh lens, and ∑CTG2 is the sum of the center thicknesses of all lenses from the sixth to the tenth lens. This embodiment reasonably controls the range of the above conditional expression, ensuring that the positive optical power of the seventh lens is coordinated and matched with the total thickness of the second lens group, ensuring smooth light deflection without local overload, avoiding spatial redundancy, and optimizing spherical aberration balance and temperature drift control, thus guaranteeing focusing stability and material utilization.

[0051] In an exemplary embodiment, the lens group satisfies: 1.25 < F131415 / ∑CTG3 < 2.55, where F131415 is the combined focal length of the thirteenth, fourteenth, and fifteenth lenses, and ∑CTG3 is the sum of the center thicknesses of all lenses from the eleventh to the fifteenth lens. This embodiment reasonably controls the range of this conditional expression, effectively suppressing image plane curvature and edge distortion, avoiding light tearing, and simultaneously concentrating the focusing ability of the rear lens group, thus improving the overall flatness and edge sharpness of the image.

[0052] In an exemplary embodiment, the lens group satisfies: 1.50 < R10 / LG1 < 2.95, where R10 is the radius of curvature of the image-side surface of the fifth lens, and LG1 is the on-axis distance from the object-side surface of the first lens to the image-side surface of the fifth lens. This embodiment reasonably controls the range of this condition, balancing the refractive intensity of off-axis rays, avoiding local astigmatism and processing difficulties, while optimizing the exit pupil position and improving energy utilization and edge illumination.

[0053] In another aspect, this application provides an optical system comprising a lens assembly provided in any embodiment of this application.

[0054] 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 fifteenth 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.

[0055] In another aspect, this application provides an electronic device that includes the optical system provided in any embodiment of this application.

[0056] 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 extended 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 the extended lens, ultimately forming an image on the imaging surface. The imaging surface is, for example, the photosensitive surface of an image sensor.

[0057] Figure 1 A schematic diagram of the overall architecture of an optical system provided in this application is shown.

[0058] 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.

[0059] The 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 either positive or negative optical power, and the third lens group G3 has positive optical power.

[0060] The first lens group G1 includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5. The first lens E1 has positive optical power, and both its object-side and image-side surfaces are convex. The second lens E2 has positive optical power, and both its object-side and image-side surfaces are convex. The third lens E3 has negative optical power, and both its object-side and image-side surfaces are concave. The fourth lens E4 has positive optical power, and both its object-side and image-side surfaces are convex. The fifth lens E5 has negative optical power, and both its object-side and image-side surfaces are concave.

[0061] The second lens group G2 includes a sixth lens E6, a seventh lens E7, an eighth lens E8, a ninth lens E9, and a tenth lens E10. The sixth lens E6 has positive optical power and its image-side surface is convex. The seventh lens E7 has positive optical power, its object-side surface is convex, and its image-side surface is concave. The eighth lens E8 has negative optical power, its object-side surface is convex, and its image-side surface is concave. The ninth lens E9 has negative optical power, its object-side surface is concave, and its image-side surface is concave. The tenth lens E10 has positive optical power.

[0062] The third lens group G3 includes the eleventh lens E11, the twelfth lens E12, the thirteenth lens E13, the fourteenth lens E14, and the fifteenth lens E15. The eleventh lens E11 has negative optical power and its object-side surface is concave. The twelfth lens E12 has positive optical power and its image-side surface is convex. The thirteenth lens E13 has positive optical power and its image-side surface is convex. The fourteenth lens E14 has negative optical power and its object-side surface is concave. The fifteenth lens E15 has positive optical power and both its object-side and image-side surfaces are convex.

[0063] The second and third lenses are cemented together, the fourth and fifth lenses are cemented together, the eleventh and twelfth lenses are cemented together, and the thirteenth and fourteenth lenses are cemented together, satisfying the following conditions: 3.31≤f12 / (CT11+CT12)≤5.40; -3.70<f14 / (CT13+CT14)<-2.30; 4.05<FG3 / CT15<8.75; f12 is the effective focal length of the twelfth lens, CT11 is the center thickness of the eleventh lens, CT12 is the center thickness of the twelfth lens, f14 is the effective focal length of the fourteenth lens, CT13 is the center thickness of the thirteenth lens, CT14 is the center thickness of the fourteenth lens, FG3 is the combined focal length of the third lens group, and CT15 is the center thickness of the fifteenth lens.

[0064] 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.

[0065] 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.

[0066] Example 1 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 15 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 22.48mm, f=-104.97mm.

[0067] 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.

[0068] The first lens group G1 includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5. The first lens group G1 has positive optical power.

[0069] 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.

[0070] The second lens E2 has positive optical power. The object side S3 of the second lens E2 is convex, and the image side S4 of the second lens E2 is convex.

[0071] The third lens E3 has negative optical power. The object side S4 of the third lens E3 is concave, and the image side S5 of the third lens E3 is concave.

[0072] The fourth lens E4 has positive optical power, the object side S6 of the fourth lens E4 is convex, and the image side S7 of the fourth lens is convex.

[0073] The fifth lens E5 has negative optical power. The object side S7 of the fifth lens E5 is concave, and the image side S8 of the fifth lens E5 is concave.

[0074] The second lens group G2 includes the sixth lens E6, the seventh lens E7, the eighth lens E8, the ninth lens E9, and the tenth lens E10. The second lens group G2 has positive optical power.

[0075] The sixth lens E6 has positive optical power. The object side S9 of the sixth lens E6 is concave, and the image side S10 of the sixth lens E6 is convex.

[0076] The seventh lens E7 has positive optical power. The object-side surface S11 of the seventh lens E7 is convex, and the image-side surface S12 of the seventh lens E7 is concave.

[0077] The eighth lens E8 has negative optical power. The object side S13 of the eighth lens E8 is convex, and the image side S14 of the eighth lens E8 is concave.

[0078] The ninth lens E9 has negative optical power. The object-side surface S15 of the ninth lens E9 is concave, and the image-side surface S16 of the ninth lens E9 is concave.

[0079] The tenth lens E10 has positive optical power. The object side S17 of the tenth lens is convex, and the image side S18 of the tenth lens is convex.

[0080] The third lens group G3 includes lens eleven (E11), lens twelfth (E12), lens thirteenth (E13), lens fourteenth (E14), and lens fifteenth (E15). The third lens group G3 has positive optical power.

[0081] The eleventh lens E11 has negative optical power. The object-side surface S19 of the eleventh lens E11 is concave, and the image-side surface S20 of the eleventh lens E11 is concave.

[0082] The twelfth lens E12 has positive optical power. The object-side surface S20 of the twelfth lens E12 is convex, and the image-side surface S21 of the twelfth lens E12 is convex.

[0083] The thirteenth lens E13 has positive optical power. The object-side surface S22 of the thirteenth lens E13 is convex, and the image-side surface S23 of the thirteenth lens E13 is convex.

[0084] The fourteenth lens E14 has negative optical power. The object side surface S23 of the fourteenth lens E14 is concave, and the image side surface S24 of the fourteenth lens E14 is convex.

[0085] The fifteenth lens E15 has positive optical power. The object-side surface S25 of the fifteenth lens E15 is convex, and the image-side surface S26 of the fifteenth lens E15 is convex.

[0086] The second lens E2 and the third lens E3 are cemented together; the fourth lens E4 and the fifth lens E5 are cemented together; the eleventh lens E11 and the twelfth lens E12 are cemented together; and the thirteenth lens E13 and the fourteenth lens E14 are cemented together.

[0087] The basic parameters of the lens group 10 in the following embodiment are shown in Table 1 (unit: mm).

[0088] Table 1

[0089] In this embodiment, the object-side surface S25 and the image-side surface S26 of the fifteenth lens E15 are aspherical surfaces. The surface shape of the aspherical lens can be limited by, but is not limited to, the following aspherical formula: (Formula 1) in, For an aspherical surface along the optical axis at a height of h When the position is such that the distance from the vertex of the non-spherical surface is the sag; c For the paraxial curvature of an aspherical surface, c =1 / R (i.e., paraxial curvature) c (The radius of curvature R in Table 3 above is the reciprocal); K is the conic coefficient. Ai Is it an aspherical first i -th order correction coefficients For height h of i The higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for the aspherical mirrors S25 and S26 in this embodiment are given in Table 2.

[0090] Table 2

[0091] 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.

[0092] according to Figure 3-5 As can be seen, the optical system given in Example 1 can achieve good imaging quality.

[0093] Example 2 The following is for reference Figures 6-9 The 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 15 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 22.48mm, f=-104.97mm.

[0094] 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.

[0095] The first lens group G1 includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5. The first lens group G1 has positive optical power.

[0096] 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.

[0097] The second lens E2 has positive optical power. The object side S3 of the second lens E2 is convex, and the image side S4 of the second lens E2 is convex.

[0098] The third lens E3 has negative optical power. The object side S4 of the third lens E3 is concave, and the image side S5 of the third lens E3 is concave.

[0099] The fourth lens E4 has positive optical power, the object side S6 of the fourth lens E4 is convex, and the image side S7 of the fourth lens is convex.

[0100] The fifth lens E5 has negative optical power. The object side S7 of the fifth lens E5 is concave, and the image side S8 of the fifth lens E5 is concave.

[0101] The second lens group G2 includes the sixth lens E6, the seventh lens E7, the eighth lens E8, the ninth lens E9, and the tenth lens E10. The second lens group G2 has positive optical power.

[0102] The sixth lens E6 has positive optical power. The object side S9 of the sixth lens E6 is concave, and the image side S10 of the sixth lens E6 is convex.

[0103] The seventh lens E7 has positive optical power. The object-side surface S11 of the seventh lens E7 is convex, and the image-side surface S12 of the seventh lens E7 is concave.

[0104] The eighth lens E8 has negative optical power. The object side S13 of the eighth lens E8 is convex, and the image side S14 of the eighth lens E8 is concave.

[0105] The ninth lens E9 has negative optical power. The object-side surface S15 of the ninth lens E9 is concave, and the image-side surface S16 of the ninth lens E9 is concave.

[0106] The tenth lens E10 has positive optical power. The object side S17 of the tenth lens is convex, and the image side S18 of the tenth lens is convex.

[0107] The third lens group G3 includes lens eleven (E11), lens twelfth (E12), lens thirteenth (E13), lens fourteenth (E14), and lens fifteenth (E15). The third lens group G3 has positive optical power.

[0108] The eleventh lens E11 has negative optical power. The object-side surface S19 of the eleventh lens E11 is concave, and the image-side surface S20 of the eleventh lens E11 is concave.

[0109] The twelfth lens E12 has positive optical power. The object-side surface S20 of the twelfth lens E12 is convex, and the image-side surface S21 of the twelfth lens E12 is convex.

[0110] The thirteenth lens E13 has positive optical power. The object-side surface S22 of the thirteenth lens E13 is convex, and the image-side surface S23 of the thirteenth lens E13 is convex.

[0111] The fourteenth lens E14 has negative optical power. The object side surface S23 of the fourteenth lens E14 is concave, and the image side surface S24 of the fourteenth lens E14 is convex.

[0112] The fifteenth lens E15 has positive optical power. The object-side surface S25 of the fifteenth lens E15 is convex, and the image-side surface S26 of the fifteenth lens E15 is convex.

[0113] The second lens E2 and the third lens E3 are cemented together; the fourth lens E4 and the fifth lens E5 are cemented together; the eleventh lens E11 and the twelfth lens E12 are cemented together; and the thirteenth lens E13 and the fourteenth lens E14 are cemented together.

[0114] The basic parameters of lens group 10 in Embodiment 2 are shown in Table 3 (unit: mm).

[0115] Table 3

[0116] In this embodiment, the object-side surface S25 and the image-side surface S26 of the fifteenth lens E15 are aspherical surfaces. The surface shape of the aspherical lens can be defined using Formula 1 above. Table 4 below shows the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for the aspherical mirror surfaces S25 and S26 in this embodiment.

[0117] Table 4

[0118] 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.

[0119] according to Figure 7-9 It can be seen that the optical system given in Example 2 can achieve good imaging quality.

[0120] Example 3 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 15 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 22.48mm, f=-104.95mm.

[0121] like Figure 10 As shown, the lens group 10 includes a first lens group G1, a second lens group G2, and a third lens group G3.

[0122] The first lens group G1 includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5. The first lens group G1 has positive optical power.

[0123] 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.

[0124] The second lens E2 has positive optical power. The object side S3 of the second lens E2 is convex, and the image side S4 of the second lens E2 is convex.

[0125] The third lens E3 has negative optical power. The object side S4 of the third lens E3 is concave, and the image side S5 of the third lens E3 is concave.

[0126] The fourth lens E4 has positive optical power, the object side S6 of the fourth lens E4 is convex, and the image side S7 of the fourth lens is convex.

[0127] The fifth lens E5 has negative optical power. The object side S7 of the fifth lens E5 is concave, and the image side S8 of the fifth lens E5 is concave.

[0128] The second lens group G2 includes the sixth lens E6, the seventh lens E7, the eighth lens E8, the ninth lens E9, and the tenth lens E10. The second lens group G2 has positive optical power.

[0129] 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.

[0130] The seventh lens E7 has positive optical power. The object-side surface S11 of the seventh lens E7 is convex, and the image-side surface S12 of the seventh lens E7 is concave.

[0131] The eighth lens E8 has negative optical power. The object side S13 of the eighth lens E8 is convex, and the image side S14 of the eighth lens E8 is concave.

[0132] The ninth lens E9 has negative optical power. The object-side surface S15 of the ninth lens E9 is concave, and the image-side surface S16 of the ninth lens E9 is concave.

[0133] The tenth lens E10 has positive optical power. The object side S17 of the tenth lens is concave, and the image side S18 of the tenth lens is convex.

[0134] The third lens group G3 includes lens eleven (E11), lens twelfth (E12), lens thirteenth (E13), lens fourteenth (E14), and lens fifteenth (E15). The third lens group G3 has positive optical power.

[0135] The eleventh lens E11 has negative optical power. The object-side surface S19 of the eleventh lens E11 is concave, and the image-side surface S20 of the eleventh lens E11 is concave.

[0136] The twelfth lens E12 has positive optical power. The object-side surface S20 of the twelfth lens E12 is convex, and the image-side surface S21 of the twelfth lens E12 is convex.

[0137] The thirteenth lens E13 has positive optical power. The object-side surface S22 of the thirteenth lens E13 is convex, and the image-side surface S23 of the thirteenth lens E13 is convex.

[0138] The fourteenth lens E14 has negative optical power. The object side surface S23 of the fourteenth lens E14 is concave, and the image side surface S24 of the fourteenth lens E14 is concave.

[0139] The fifteenth lens E15 has positive optical power. The object-side surface S25 of the fifteenth lens E15 is convex, and the image-side surface S26 of the fifteenth lens E15 is convex.

[0140] The second lens E2 and the third lens E3 are cemented together; the fourth lens E4 and the fifth lens E5 are cemented together; the eleventh lens E11 and the twelfth lens E12 are cemented together; and the thirteenth lens E13 and the fourteenth lens E14 are cemented together.

[0141] The basic parameters of lens group 10 in Embodiment 3 are shown in Table 5 (unit: mm).

[0142] Table 5

[0143] In this embodiment, the object-side surface S25 and the image-side surface S26 of the fifteenth lens E15 are aspherical. The surface shape of the aspherical lens can be defined using Formula 1 above. Table 6 below shows the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for the aspherical mirror surfaces S25 and S26 in this embodiment.

[0144] Table 6

[0145] 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.

[0146] according to Figure 11-13 As can be seen, the optical system given in Example 3 can achieve good imaging quality.

[0147] Example 4 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 15 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 22.48mm, f=-104.95mm.

[0148] 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.

[0149] The first lens group G1 includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5. The first lens group G1 has positive optical power.

[0150] 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.

[0151] The second lens E2 has positive optical power. The object side S3 of the second lens E2 is convex, and the image side S4 of the second lens E2 is convex.

[0152] The third lens E3 has negative optical power. The object side S4 of the third lens E3 is concave, and the image side S5 of the third lens E3 is concave.

[0153] The fourth lens E4 has positive optical power, the object side S6 of the fourth lens E4 is convex, and the image side S7 of the fourth lens is convex.

[0154] The fifth lens E5 has negative optical power. The object side S7 of the fifth lens E5 is concave, and the image side S8 of the fifth lens E5 is concave.

[0155] The second lens group G2 includes the sixth lens E6, the seventh lens E7, the eighth lens E8, the ninth lens E9, and the tenth lens E10. The second lens group G2 has positive optical power.

[0156] 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.

[0157] The seventh lens E7 has positive optical power. The object-side surface S11 of the seventh lens E7 is convex, and the image-side surface S12 of the seventh lens E7 is concave.

[0158] The eighth lens E8 has negative optical power. The object side S13 of the eighth lens E8 is convex, and the image side S14 of the eighth lens E8 is concave.

[0159] The ninth lens E9 has negative optical power. The object-side surface S15 of the ninth lens E9 is concave, and the image-side surface S16 of the ninth lens E9 is concave.

[0160] The tenth lens E10 has positive optical power. The object side S17 of the tenth lens is convex, and the image side S18 of the tenth lens is convex.

[0161] The third lens group G3 includes lens eleven (E11), lens twelfth (E12), lens thirteenth (E13), lens fourteenth (E14), and lens fifteenth (E15). The third lens group G3 has positive optical power.

[0162] The eleventh lens E11 has negative optical power. The object-side surface S19 of the eleventh lens E11 is concave, and the image-side surface S20 of the eleventh lens E11 is concave.

[0163] The twelfth lens E12 has positive optical power. The object-side surface S20 of the twelfth lens E12 is convex, and the image-side surface S21 of the twelfth lens E12 is convex.

[0164] The thirteenth lens E13 has positive optical power. The object-side surface S22 of the thirteenth lens E13 is convex, and the image-side surface S23 of the thirteenth lens E13 is convex.

[0165] The fourteenth lens E14 has negative optical power. The object side surface S23 of the fourteenth lens E14 is concave, and the image side surface S24 of the fourteenth lens E14 is concave.

[0166] The fifteenth lens E15 has positive optical power. The object-side surface S25 of the fifteenth lens E15 is convex, and the image-side surface S26 of the fifteenth lens E15 is convex.

[0167] The second lens E2 and the third lens E3 are cemented together; the fourth lens E4 and the fifth lens E5 are cemented together; the eleventh lens E11 and the twelfth lens E12 are cemented together; and the thirteenth lens E13 and the fourteenth lens E14 are cemented together.

[0168] The basic parameters of lens group 10 in Embodiment 4 are shown in Table 7 (unit: mm).

[0169] Table 7

[0170] In this embodiment, the object-side surface S25 and the image-side surface S26 of the fifteenth lens E15 are aspherical. The surface shape of the aspherical lens can be defined using Formula 1 above. Table 8 below shows the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for the aspherical mirror surfaces S25 and S26 in this embodiment.

[0171] Table 8

[0172] 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.

[0173] according to Figure 15-17 As can be seen, the optical system given in Example 4 can achieve good imaging quality.

[0174] Example 5 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 15 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 22.48mm, f=-104.95mm.

[0175] 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.

[0176] The first lens group G1 includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5. The first lens group G1 has positive optical power.

[0177] 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.

[0178] The second lens E2 has positive optical power. The object side S3 of the second lens E2 is convex, and the image side S4 of the second lens E2 is convex.

[0179] The third lens E3 has negative optical power. The object side S4 of the third lens E3 is concave, and the image side S5 of the third lens E3 is concave.

[0180] The fourth lens E4 has positive optical power, the object side S6 of the fourth lens E4 is convex, and the image side S7 of the fourth lens is convex.

[0181] The fifth lens E5 has negative optical power. The object side S7 of the fifth lens E5 is concave, and the image side S8 of the fifth lens E5 is concave.

[0182] The second lens group G2 includes the sixth lens E6, the seventh lens E7, the eighth lens E8, the ninth lens E9, and the tenth lens E10. The second lens group G2 has positive optical power.

[0183] 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.

[0184] The seventh lens E7 has positive optical power. The object-side surface S11 of the seventh lens E7 is convex, and the image-side surface S12 of the seventh lens E7 is concave.

[0185] The eighth lens E8 has negative optical power. The object side S13 of the eighth lens E8 is convex, and the image side S14 of the eighth lens E8 is concave.

[0186] The ninth lens E9 has negative optical power. The object-side surface S15 of the ninth lens E9 is concave, and the image-side surface S16 of the ninth lens E9 is concave.

[0187] The tenth lens E10 has positive optical power. The object side S17 of the tenth lens is concave, and the image side S18 of the tenth lens is convex.

[0188] The third lens group G3 includes lens eleven (E11), lens twelfth (E12), lens thirteenth (E13), lens fourteenth (E14), and lens fifteenth (E15). The third lens group G3 has positive optical power.

[0189] The eleventh lens E11 has negative optical power. The object-side surface S19 of the eleventh lens E11 is concave, and the image-side surface S20 of the eleventh lens E11 is convex.

[0190] The twelfth lens E12 has positive optical power. The object-side surface S20 of the twelfth lens E12 is concave, and the image-side surface S21 of the twelfth lens E12 is convex.

[0191] The thirteenth lens E13 has positive optical power. The object-side surface S22 of the thirteenth lens E13 is convex, and the image-side surface S23 of the thirteenth lens E13 is convex.

[0192] The fourteenth lens E14 has negative optical power. The object side surface S23 of the fourteenth lens E14 is concave, and the image side surface S24 of the fourteenth lens E14 is concave.

[0193] The fifteenth lens E15 has positive optical power. The object-side surface S25 of the fifteenth lens E15 is convex, and the image-side surface S26 of the fifteenth lens E15 is convex.

[0194] The second lens E2 and the third lens E3 are cemented together; the fourth lens E4 and the fifth lens E5 are cemented together; the eleventh lens E11 and the twelfth lens E12 are cemented together; and the thirteenth lens E13 and the fourteenth lens E14 are cemented together.

[0195] The basic parameters of lens group 10 in Embodiment 5 are shown in Table 9 (unit: mm).

[0196] Table 9

[0197] In this embodiment, the object-side surface S25 and the image-side surface S26 of the fifteenth lens E15 are aspherical. The surface shape of the aspherical lens can be defined using Formula 1 above. Table 10 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for the aspherical mirror surfaces S25 and S26 in this embodiment.

[0198] Table 10

[0199] 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.

[0200] according to Figure 19-21 As can be seen, the optical system given in Example 5 can achieve good imaging quality.

[0201] Example 6 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 15 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 22.48mm, f=-104.99mm.

[0202] 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.

[0203] The first lens group G1 includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5. The first lens group G1 has positive optical power.

[0204] 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.

[0205] The second lens E2 has positive optical power. The object side S3 of the second lens E2 is convex, and the image side S4 of the second lens E2 is convex.

[0206] The third lens E3 has negative optical power. The object side S4 of the third lens E3 is concave, and the image side S5 of the third lens E3 is concave.

[0207] The fourth lens E4 has positive optical power, the object side S6 of the fourth lens E4 is convex, and the image side S7 of the fourth lens is convex.

[0208] The fifth lens E5 has negative optical power. The object side S7 of the fifth lens E5 is concave, and the image side S8 of the fifth lens E5 is concave.

[0209] The second lens group G2 includes the sixth lens E6, the seventh lens E7, the eighth lens E8, the ninth lens E9, and the tenth lens E10. The second lens group G2 has positive optical power.

[0210] The sixth lens E6 has positive optical power. The object side S9 of the sixth lens E6 is concave, and the image side S10 of the sixth lens E6 is convex.

[0211] The seventh lens E7 has positive optical power. The object-side surface S11 of the seventh lens E7 is convex, and the image-side surface S12 of the seventh lens E7 is concave.

[0212] The eighth lens E8 has negative optical power. The object side S13 of the eighth lens E8 is convex, and the image side S14 of the eighth lens E8 is concave.

[0213] The ninth lens E9 has negative optical power. The object-side surface S15 of the ninth lens E9 is concave, and the image-side surface S16 of the ninth lens E9 is concave.

[0214] The tenth lens E10 has positive optical power. The object side S17 of the tenth lens is convex, and the image side S18 of the tenth lens is convex.

[0215] The third lens group G3 includes lens eleven (E11), lens twelfth (E12), lens thirteenth (E13), lens fourteenth (E14), and lens fifteenth (E15). The third lens group G3 has positive optical power.

[0216] The eleventh lens E11 has negative optical power. The object-side surface S19 of the eleventh lens E11 is concave, and the image-side surface S20 of the eleventh lens E11 is concave.

[0217] The twelfth lens E12 has positive optical power. The object-side surface S20 of the twelfth lens E12 is convex, and the image-side surface S21 of the twelfth lens E12 is convex.

[0218] The thirteenth lens E13 has positive optical power. The object-side surface S22 of the thirteenth lens E13 is convex, and the image-side surface S23 of the thirteenth lens E13 is convex.

[0219] The fourteenth lens E14 has negative optical power. The object side surface S23 of the fourteenth lens E14 is concave, and the image side surface S24 of the fourteenth lens E14 is convex.

[0220] The fifteenth lens E15 has positive optical power. The object-side surface S25 of the fifteenth lens E15 is convex, and the image-side surface S26 of the fifteenth lens E15 is convex.

[0221] The second lens E2 and the third lens E3 are cemented together; the fourth lens E4 and the fifth lens E5 are cemented together; the eleventh lens E11 and the twelfth lens E12 are cemented together; and the thirteenth lens E13 and the fourteenth lens E14 are cemented together.

[0222] The basic parameters of lens group 10 in Embodiment Six are shown in Table 11 (unit: mm).

[0223] Table 11

[0224] In this embodiment, the object-side surface S25 and the image-side surface S26 of the fifteenth lens E15 are aspherical. The surface shape of the aspherical lens can be defined using Formula 1 above. Table 12 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for the aspherical mirrors S25 and S26 in this embodiment.

[0225] Table 12

[0226] 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.

[0227] according to Figure 23-25 As can be seen, the optical system given in Example 6 can achieve good imaging quality.

[0228] Example 7 The following is for reference Figures 26-29 The lens assembly 10 according to Embodiment 7 of this application is described. Figure 26 A schematic diagram of the lens group 10 of Embodiment 7 provided in this application is shown. Embodiment 7 includes 15 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 22.48mm, f=-105.00mm.

[0229] like Figure 26 As shown, the lens group 10 includes a first lens group G1, a second lens group G2, and a third lens group G3.

[0230] The first lens group G1 includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5. The first lens group G1 has positive optical power.

[0231] 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.

[0232] The second lens E2 has positive optical power. The object side S3 of the second lens E2 is convex, and the image side S4 of the second lens E2 is convex.

[0233] The third lens E3 has negative optical power. The object side S4 of the third lens E3 is concave, and the image side S5 of the third lens E3 is concave.

[0234] The fourth lens E4 has positive optical power, the object side S6 of the fourth lens E4 is convex, and the image side S7 of the fourth lens is convex.

[0235] The fifth lens E5 has negative optical power. The object side S7 of the fifth lens E5 is concave, and the image side S8 of the fifth lens E5 is concave.

[0236] The second lens group G2 includes the sixth lens E6, the seventh lens E7, the eighth lens E8, the ninth lens E9, and the tenth lens E10. The second lens group G2 has negative optical power.

[0237] The sixth lens E6 has positive optical power. The object side S9 of the sixth lens E6 is concave, and the image side S10 of the sixth lens E6 is convex.

[0238] The seventh lens E7 has positive optical power. The object-side surface S11 of the seventh lens E7 is convex, and the image-side surface S12 of the seventh lens E7 is concave.

[0239] The eighth lens E8 has negative optical power. The object side S13 of the eighth lens E8 is convex, and the image side S14 of the eighth lens E8 is concave.

[0240] The ninth lens E9 has negative optical power. The object-side surface S15 of the ninth lens E9 is concave, and the image-side surface S16 of the ninth lens E9 is concave.

[0241] The tenth lens E10 has positive optical power. The object side S17 of the tenth lens is convex, and the image side S18 of the tenth lens is concave.

[0242] The third lens group G3 includes lens eleven (E11), lens twelfth (E12), lens thirteenth (E13), lens fourteenth (E14), and lens fifteenth (E15). The third lens group G3 has positive optical power.

[0243] The eleventh lens E11 has negative optical power. The object-side surface S19 of the eleventh lens E11 is concave, and the image-side surface S20 of the eleventh lens E11 is concave.

[0244] The twelfth lens E12 has positive optical power. The object-side surface S20 of the twelfth lens E12 is convex, and the image-side surface S21 of the twelfth lens E12 is convex.

[0245] The thirteenth lens E13 has positive optical power. The object-side surface S22 of the thirteenth lens E13 is concave, and the image-side surface S23 of the thirteenth lens E13 is convex.

[0246] The fourteenth lens E14 has negative optical power. The object side surface S23 of the fourteenth lens E14 is concave, and the image side surface S24 of the fourteenth lens E14 is convex.

[0247] The fifteenth lens E15 has positive optical power. The object-side surface S25 of the fifteenth lens E15 is convex, and the image-side surface S26 of the fifteenth lens E15 is convex.

[0248] The second lens E2 and the third lens E3 are cemented together; the fourth lens E4 and the fifth lens E5 are cemented together; the eleventh lens E11 and the twelfth lens E12 are cemented together; and the thirteenth lens E13 and the fourteenth lens E14 are cemented together.

[0249] The basic parameters of lens group 10 in Embodiment 7 are shown in Table 13 (unit: mm).

[0250] Table 13

[0251] In this embodiment, the object-side surface S25 and the image-side surface S26 of the fifteenth lens E15 are aspherical. The surface shape of the aspherical lens can be defined using Formula 1 above. Table 14 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for the aspherical mirror surfaces S25 and S26 in this embodiment.

[0252] Table 14

[0253] Figure 27 A schematic diagram of the on-axis chromatic aberration curve of the optical system of Embodiment Seven is shown. Figure 28 A schematic diagram of the astigmatism curve of the optical system of Embodiment Seven is shown. Figure 29 A schematic diagram of the distortion curve of the optical system of Embodiment 7 is shown.

[0254] according to Figure 27-29 It can be seen that the optical system given in Example 7 can achieve good imaging quality.

[0255] Some optical parameters of Examples 1 to 7 are shown in Table 15 (unit: mm). The conditions satisfied by Examples 1 to 7 are shown in Table 16.

[0256] Table 15

[0257] Table 16

[0258] In addition, this application also provides an optical system including a lens group provided in any embodiment of this application.

[0259] 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.

[0260] 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 with positive optical power, wherein the object side of the first lens is convex and the image side of the first lens is convex. A second lens with positive optical power, wherein the object-side surface of the second lens is convex and the image-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 and the image-side surface of the third lens is concave. A fourth lens with positive optical power, wherein the object-side surface of the fourth lens is convex and the image-side surface of the fourth lens is convex. 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 concave; The second lens group has positive or negative optical power, and the second lens group includes: A sixth lens with positive optical power, wherein the image-side surface of the sixth lens is convex; A seventh lens with positive optical power, wherein the object-side surface of the seventh lens is convex and the image-side surface of the seventh lens is concave; An eighth lens with negative optical power, wherein the object-side surface of the eighth lens is convex and the image-side surface of the eighth lens is concave; A ninth lens with negative optical power, wherein the object-side surface of the ninth lens is concave and the image-side surface of the ninth lens is concave. A tenth lens with positive optical power; The third lens group has positive optical power, and the third lens group includes: An eleventh lens with negative optical power, wherein the object side of the eleventh lens is concave; A twelfth lens with positive optical power, wherein the image-side surface of the twelfth lens is convex; A thirteenth lens with positive optical power, wherein the image-side surface of the thirteenth lens is convex; A fourteenth lens with negative optical power, wherein the object side of the fourteenth lens is concave; A fifteenth lens with positive optical power, wherein the object-side surface of the fifteenth lens is convex, and the image-side surface of the fifteenth lens is convex. Wherein, the second lens and the third lens are cemented together, the fourth lens and the fifth lens are cemented together, the eleventh lens and the twelfth lens are cemented together, and the thirteenth lens and the fourteenth lens are cemented together, and the following conditions are met: 3.31≤f12 / (CT11+CT12)≤5.40; -3.70<f14 / (CT13+CT14)<-2.30; 4.05<FG3 / CT15<8.75; Wherein, f12 is the effective focal length of the twelfth lens, CT11 is the center thickness of the eleventh lens, CT12 is the center thickness of the twelfth lens, f14 is the effective focal length of the fourteenth lens, CT13 is the center thickness of the thirteenth lens, CT14 is the center thickness of the fourteenth lens, FG3 is the combined focal length of the third lens group, and CT15 is the center thickness of the fifteenth lens.

2. The lens assembly according to claim 1, characterized in that, The lens group satisfies: -3.40 < F23 / f1 ≤ -2.70, where F23 is the combined focal length of the second lens and the third lens, and f1 is the effective focal length of the first lens.

3. The lens assembly according to claim 1, characterized in that, The lens group satisfies: 4.00≤|FG2| / T1011≤10.75, where FG2 is the combined focal length of the second lens group, and T1011 is the air gap between the tenth lens and the eleventh lens on the optical axis.

4. The lens assembly according to claim 1, characterized in that, The lens group satisfies: 1.70 < (R3 + R6) / f2 < 2.15, where R3 is the radius of curvature of the object side of the second lens, R6 is the radius of curvature of the image side of the third 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: 3.80 < F123 / f15 < 6.30, where F123 is the combined focal length of the first lens, the second lens, and the third lens, and f15 is the effective focal length of the fifteenth lens.

6. The lens assembly according to claim 1, characterized in that, The lens group satisfies: -1.20 < LG2 / (f8+f9) < -0.75, where LG2 is the axial distance from the object side of the sixth lens to the image side of the tenth lens, f8 is the effective focal length of the eighth lens, and f9 is the effective focal length of the ninth lens.

7. The lens assembly according to claim 1, characterized in that, The lens group satisfies: -3.40 < (R1 + R2) / FG1 < -1.95, where R1 is the radius of curvature of the object side of the first lens, R2 is the radius of curvature of the image side of the first lens, and FG1 is the combined focal length of the first lens group.

8. The lens assembly according to claim 1, characterized in that, The lens group satisfies: 8.80 < F67 / T78 < 11.40, where F67 is the combined focal length of the sixth lens and the seventh lens, and T78 is the air gap between the seventh lens and the eighth lens on the optical axis.

9. The lens assembly according to claim 1, characterized in that, The lens group satisfies: -3.65≤f10 / F89<-2.10, where f10 is the effective focal length of the tenth lens and F89 is the combined focal length of the eighth and ninth lenses.

10. The lens assembly according to claim 1, characterized in that, The lens group satisfies: -1.45 < (f14 × N14) / (f13 × N13) < -0.75, where f14 is the effective focal length of the fourteenth lens, N14 is the refractive index of the fourteenth lens, f13 is the effective focal length of the thirteenth lens, and N13 is the refractive index of the thirteenth lens.

11. The lens assembly according to claim 1, characterized in that, The lens group satisfies: 4.75≤TD / LG3<7.05, where TD is the axial distance from the object side of the first lens to the image side of the fifteenth lens, and LG3 is the axial distance from the object side of the eleventh lens to the image side of the fifteenth lens.

12. The lens assembly according to claim 1, characterized in that, The lens group satisfies: 2.65 < ∑CTG1 / (CT2+CT3) ≤ 3.35, where ∑CTG1 is the sum of the center thicknesses of all lenses from the first lens to the fifth lens, CT2 is the center thickness of the second lens, and CT3 is the center thickness of the third lens.

13. The lens assembly according to claim 1, characterized in that, The lens group satisfies: 2.15≤f7 / ∑CTG2<5.80, where f7 is the effective focal length of the seventh lens, and ∑CTG2 is the sum of the center thicknesses of all lenses from the sixth lens to the tenth lens.

14. The lens assembly according to claim 1, characterized in that, The lens group satisfies: 1.25 < F131415 / ∑CTG3 < 2.55, where F131415 is the combined focal length of the thirteenth lens, the fourteenth lens, and the fifteenth lens, and ∑CTG3 is the sum of the center thicknesses of all lenses from the eleventh lens to the fifteenth lens.

15. The lens assembly according to claim 1, characterized in that, The lens group satisfies: 1.50 < R10 / LG1 < 2.95, where R10 is the radius of curvature of the image-side surface of the fifth lens, and LG1 is the axial distance from the object-side surface of the first lens to the image-side surface of the fifth lens.

16. An optical system, characterized in that, Includes the lens assembly according to any one of claims 1-15.

17. The optical system according to claim 16, characterized in that, The optical system also includes an imaging lens and an imaging surface located on the image side of the fifteenth 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.

18. An electronic device, characterized in that, Includes the optical system according to any one of claims 16-17.

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