Lens set, optical system, and electronic device

Abstract

The invention provides a lens group, an optical system and electronic equipment. The lens group comprises a first lens group, a second lens group and a third lens group. The first lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. The second lens group comprises a seventh lens, an eighth lens and a ninth lens; the third lens group comprises a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens and a fourteenth lens; the lens group meets the following conditions: f8 / CT8 is more than or equal to 2.36 and less than or equal to 3.35; fG1 / F123 is more than 2.05 and less than 2.65; fG2 / FG3 is larger than or equal to 2.55 and smaller than or equal to 3.33, f8 is the effective focal length of the eighth lens, CT8 is the center thickness of the eighth lens, FG1 is the combined focal length of the first lens group, F123 is the combined focal length of the first lens, the second lens and the third lens, FG2 is the combined focal length of the second lens group, and FG3 is the combined focal length of the third lens group. The optical system gives consideration to miniaturization and cooperative correction, and ensures efficient coupling with the imaging lens, so as to 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 communication technology and smart terminals, mobile devices (such as smartphones and tablets) have become the most important photography tools in people's daily lives. Users have increasingly higher requirements for the shooting quality of mobile devices, not only pursuing high pixels and high definition, but also placing higher expectations on long-distance shooting capabilities. To achieve long-distance shooting, current mobile devices usually adopt digital zoom or multi-camera modules (such as periscope telephoto lenses). However, digital zoom is essentially image cropping and interpolation, which leads to a significant decrease in image quality and loss of detail; while built-in periscope telephoto modules improve image quality, they are often limited by the thickness and internal space of the phone body, and their aperture size, sensor size, and focal length coverage often have physical bottlenecks, making it difficult to meet professional-grade telephoto needs. Therefore, external or add-on imaging systems (such as teleconverters) have become an effective solution to improve the telephoto capabilities of mobile devices. Summary of the Invention

[0003] One aspect of this application provides a lens assembly, which sequentially includes a first lens group, a second lens group, and a third lens group along the optical axis from the object side to the image side. The first lens group has positive optical power and includes: a first lens having positive or negative optical power, wherein the object side of the first lens is convex and the image side of the first lens is concave; a second lens having positive optical power, wherein the object side of the second lens is convex and the image side of the second lens is convex; a third lens having negative optical power, wherein the object side of the third lens is concave and the image side of the third lens is convex; and a fourth lens having positive optical power, wherein the object side of the fourth lens is convex and the image side of the fourth lens is concave. The third lens group has a positive optical power, comprising: a fifth lens with a 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; a sixth lens with a positive optical power, wherein the object-side surface of the sixth lens is flat and the image-side surface of the sixth lens is flat, and the object-side surface of the sixth lens is a diffraction surface; the second lens group has positive optical power, and the second lens group includes: a seventh lens with positive optical power, wherein the object-side surface of the seventh lens is convex; an eighth lens with positive 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 convex and the image-side surface of the ninth lens is concave; and the third lens group. The third lens group, having positive optical power, comprises: a tenth lens with negative optical power, wherein the object-side surface of the tenth lens is concave and the image-side surface of the tenth lens is concave; an eleventh lens with positive optical power, wherein the object-side surface of the eleventh lens is convex and the image-side surface of the eleventh lens is convex; a twelfth lens with negative optical power, wherein the object-side surface of the twelfth lens is convex and the image-side surface of the twelfth lens is concave; a thirteenth lens with positive optical power, wherein the object-side surface of the thirteenth lens is convex and the image-side surface of the thirteenth lens is convex; and a fourteenth lens with positive optical power, wherein the object-side surface of the fourteenth lens is convex; wherein the first lens, the second lens, and the third lens are cemented together. The fourth and fifth lenses are cemented together, the eighth and ninth lenses are cemented together, the tenth and eleventh lenses are cemented together, and the twelfth and thirteenth lenses are cemented together; the lens group satisfies: 2.36≤f8 / CT8≤3.35; 2.05<FG1 / F123<2.65; 2.55≤FG2 / FG3≤3.33, where f8 is the effective focal length of the eighth lens, CT8 is the center thickness of the eighth lens, FG1 is the combined focal length of the first lens group, F123 is the combined focal length of the first, second, and third lenses, FG2 is the combined focal length of the second lens group, and FG3 is the combined focal length of the third lens group.

[0004] According to an embodiment of this application, the combined focal length F45 of the fourth lens and the fifth lens, the center thickness CT4 of the fourth lens, and the center thickness CT5 of the fifth lens satisfy: -11.85 < F45 / (CT4+CT5) < -9.40.

[0005] According to an embodiment of this application, the axial distance TD between the object side of the first lens and the image side of the fourteenth lens, the air gap T56 between the fifth lens and the sixth lens on the optical axis, and the air gap T67 between the sixth lens and the seventh lens on the optical axis satisfy: 2.15 < TD / (T56 + T67) < 2.95.

[0006] According to an embodiment of this application, the combined focal length F89 of the eighth lens and the ninth lens, the radius of curvature R15 of the object side of the eighth lens, and the radius of curvature R18 of the image side of the ninth lens satisfy: -3.15≤F89 / (R15+R18)<-2.70.

[0007] According to an embodiment of this application, the effective focal length f4 of the fourth lens and the sum of the center thicknesses of all lenses from the first lens to the sixth lens, ∑CTG1, satisfy: 2.75≤f4 / ∑CTG1<3.25.

[0008] According to an embodiment of this application, the combined focal length F1213 of the twelfth lens and the thirteenth lens, and the on-axis distance LG3 from the object side of the tenth lens to the image side of the fourteenth lens, satisfy: 1.20 < F1213 / LG3 < 2.05.

[0009] According to an embodiment of this application, the radius of curvature R28 of the image side of the fourteenth lens and the center thickness CT14 of the fourteenth lens satisfy: 6.65≤|R28| / CT14≤15.67.

[0010] According to an embodiment of this application, the effective focal length f14 of the fourteenth lens, the effective focal length f12 of the twelfth lens, and the effective focal length f13 of the thirteenth lens satisfy: -2.95 < f14 / (f12+f13) < -1.15.

[0011] According to an embodiment of this application, the combined focal length F456 of the fourth lens, the fifth lens, and the sixth lens, and the effective focal length f7 of the seventh lens satisfy: -3.00 < F456 / f7 < -2.15.

[0012] According to an embodiment of this application, the effective focal length f9 of the ninth lens, the effective focal length f10 of the tenth lens, and the air gap T910 between the ninth lens and the tenth lens on the optical axis satisfy: -3.47≤(f9+f10) / T910≤-2.40.

[0013] According to an embodiment of this application, the axial distance LG1 between the object side of the first lens and the image side of the sixth lens and the effective focal length f2 of the second lens satisfy: 0.40 < LG1 / f2 < 1.10.

[0014] According to an embodiment of this application, the radius of curvature R5 of the object side of the third lens, the radius of curvature R6 of the image side of the third lens, and the effective focal length f3 of the third lens satisfy: 0.95≤(R5+R6) / f3≤1.86.

[0015] According to an embodiment of this application, the sum of the center thicknesses of all lenses from the tenth lens to the fourteenth lens, ∑CTG3, and the sum of the center thicknesses of all lenses from the seventh lens to the ninth lens, ∑CTG2, satisfy: 1.87≤∑CTG3 / ∑CTG2≤2.65.

[0016] According to an embodiment of this application, the combined focal length F12345 of the first lens, the second lens, the third lens, the fourth lens and the fifth lens, and the combined focal length F121314 of the twelfth lens, the thirteenth lens and the fourteenth lens satisfy: 7.15 < F12345 / F121314 < 9.75.

[0017] According to an embodiment of this application, the combined focal length FG2 of the second lens group and the on-axis distance LG2 from the object side of the seventh lens to the image side of the ninth lens satisfy: 1.75≤FG2 / LG2≤2.92.

[0018] According to an embodiment of this application, the center thickness CT10 of the tenth lens, the refractive index N10 of the tenth lens, the center thickness CT11 of the eleventh lens, and the refractive index N11 of the eleventh lens satisfy: 0.30 < (CT10 × N10) / (CT11 × N11) < 1.40.

[0019] Another aspect of the embodiments of this application provides an optical system that includes a lens group provided in any embodiment of this application.

[0020] 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 fourteenth 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.

[0021] Another aspect of this application provides an electronic device including the optical system provided in any embodiment of this application.

[0022] According to the technical solution of the embodiments of this application, by reasonably configuring this lens group, through the synergistic constraints of three conditional expressions, namely 2.36≤f8 / CT8≤3.35, 2.05<FG1 / F123<2.65, and 2.55≤FG2 / FG3≤3.33, combined with the use of cemented lens group and the introduction of diffraction surface, the balance between the beam converging ability and structural strength of the eighth lens can be controlled, the magnification and beam aperture variation law of the lens group can be stabilized, and the edge image quality can be taken into account. This allows the three lens groups to bear an appropriate proportion of optical power distribution, so as to achieve synergistic correction of axial chromatic aberration, spherical aberration and field curvature while taking into account miniaturization, and ensure efficient coupling with the imaging lens, thereby obtaining a high-quality telephoto imaging effect. Attached Figure Description

[0023] 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:

[0024] 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.

[0025] 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 12A 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; and Figure 21 A schematic diagram of the distortion curve of the optical system in Embodiment 5 is shown. Detailed Implementation

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] The features, principles and other aspects of this application are described in detail below.

[0034] This application provides a lens assembly, which 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.

[0035] The first lens group has positive optical power and includes: a first lens with positive or negative optical power, a second lens with positive optical power, a third lens with negative optical power, a fourth lens with positive optical power, a fifth lens with negative optical power, and a sixth lens with positive optical power. The object-side surface of the first lens is convex, and the image-side surface of the first lens is concave; the object-side surface of the second lens is convex, and the image-side surface of the second lens is convex; the object-side surface of the third lens is concave, and the image-side surface of the third lens is convex; the object-side surface of the fourth lens is convex, and the image-side surface of the fourth lens is convex; the object-side surface of the fifth lens is concave, and the image-side surface of the fifth lens is concave; the object-side surface of the sixth lens is flat, and the image-side surface of the sixth lens is flat, and the object-side surface of the sixth lens is a diffraction surface.

[0036] The second lens group has positive optical power and includes: a seventh lens with positive optical power, an eighth lens with positive optical power, and a ninth lens with negative optical power. The object-side surface of the seventh lens is convex; the object-side surface of the eighth lens is convex, and the image-side surface of the eighth lens is concave; the object-side surface of the ninth lens is convex, and the image-side surface of the ninth lens is concave.

[0037] The third lens group has positive optical power and includes: a tenth lens with negative optical power, an eleventh lens with positive optical power, a twelfth lens with negative optical power, a thirteenth lens with positive optical power, and a fourteenth lens with positive optical power. The object-side surface of the tenth lens is concave, and the image-side surface of the tenth lens is also concave; the object-side surface of the eleventh lens is convex, and the image-side surface of the eleventh lens is also convex; the object-side surface of the twelfth lens is convex, and the image-side surface of the twelfth lens is concave; the object-side surface of the thirteenth lens is convex, and the image-side surface of the fourteenth lens is also convex.

[0038] The first, second, and third lenses are cemented together; the fourth and fifth lenses are cemented together; the eighth and ninth lenses are cemented together; the tenth and eleventh lenses are cemented together; and the twelfth and thirteenth lenses are cemented together.

[0039] The lens group satisfies the following conditions: 2.36≤f8 / CT8≤3.35; 2.05<FG1 / F123<2.65; 2.55≤FG2 / FG3≤3.33, where f8 is the effective focal length of the eighth lens, CT8 is the center thickness of the eighth lens, FG1 is the combined focal length of the first lens group, F123 is the combined focal length of the first, second, and third lenses, FG2 is the combined focal length of the second lens group, and FG3 is the combined focal length of the third lens group.

[0040] The lens group provided in this application, through the coordinated constraints of three conditional formulas—2.36≤f8 / CT8≤3.35, 2.05<FG1 / F123<2.65, and 2.55≤FG2 / FG3≤3.33—combined with the use of cemented lens groups and the introduction of diffraction surfaces, can control the balance between the beam-converging ability and structural strength of the eighth lens, stabilize the magnification and beam aperture variation of the lens group, and take into account edge image quality. This allows the three lens groups to bear an appropriate proportion of optical power distribution, so as to achieve coordinated correction of axial chromatic aberration, spherical aberration, and field curvature while taking into account miniaturization, and ensure efficient coupling with the imaging lens, thereby obtaining high-quality telephoto imaging effects.

[0041] In an exemplary embodiment, the combined focal length F45 of the fourth and fifth lenses, the center thickness CT4 of the fourth lens, and the center thickness CT5 of the fifth lens satisfy: -11.85 < F45 / (CT4+CT5) < -9.40. This embodiment reasonably controls this conditional range so that it can provide the divergence capability required for telephoto extension without introducing uncontrollable aberrations and manufacturing risks.

[0042] In an exemplary embodiment, the axial distance TD between the object side of the first lens and the image side of the fourteenth lens, the air gap T56 between the fifth and sixth lenses on the optical axis, and the air gap T67 between the sixth and seventh lenses on the optical axis satisfy: 2.15 < TD / (T56 + T67) < 2.95. This embodiment reasonably controls the range of this conditional expression to control the beam expansion and contraction rhythm at the transition between different beam groups, thereby taking into account: the stability of the magnification, the beam aperture and incident angle distribution of the key surfaces (including diffraction surfaces), and the structural length and assembly space.

[0043] In an exemplary embodiment, the combined focal length F89 of the eighth and ninth lenses, the radius of curvature R15 of the object-side surface of the eighth lens, and the radius of curvature R18 of the image-side surface of the ninth lens satisfy: -3.15 ≤ F89 / (R15+R18) < -2.70. Reasonably controlling this conditional range stabilizes the correction capabilities of the eighth and ninth cemented lens groups for astigmatism, coma, and distortion, and suppresses processing and coating risks caused by excessive curvature.

[0044] In an exemplary embodiment, the effective focal length f4 of the fourth lens and the sum of the center thicknesses of all lenses from the first lens to the sixth lens, ∑CTG1, satisfy: 2.75 ≤ f4 / ∑CTG1 < 3.25. This embodiment reasonably controls the range of this condition, which is beneficial for achieving the front focal length allocation required for telephoto extension within a limited thickness, and achieving a balance between focal length, thickness, and aberration.

[0045] In an exemplary embodiment, the combined focal length F1213 of the twelfth and thirteenth lenses and the axial distance LG3 from the object side of the tenth lens to the image side of the fourteenth lens satisfy: 1.20 < F1213 / LG3 < 2.05. This embodiment reasonably controls this conditional range, enabling the twelfth and thirteenth cemented lens groups to effectively handle aberration correction (especially field curvature and astigmatism) and maintain stable coupling with the imaging lens.

[0046] In an exemplary embodiment, the radius of curvature R28 of the image-side surface of the fourteenth lens and the center thickness CT14 of the fourteenth lens satisfy: 6.65 ≤ |R28| / CT14 ≤ 15.67. This embodiment reasonably controls this conditional range to avoid the curvature of the fourteenth lens being too steep or too flat, thereby stabilizing the principal ray angle and the shape of the emitted beam on the image side, which is beneficial for matching with the entrance pupil of the imaging lens, and takes into account both the processing strength and coating yield of the fourteenth lens.

[0047] In an exemplary embodiment, the effective focal length f14 of the fourteenth lens, the effective focal length f12 of the twelfth lens, and the effective focal length f13 of the thirteenth lens satisfy: -2.95 < f14 / (f12+f13) < -1.15. This embodiment reasonably controls the range of this conditional expression, optimizes the optical power distribution of the last three lenses, enables the latter part to collaboratively correct field curvature and astigmatism, controls the convergence and divergence of the image-side emitted beam, and improves the coupling stability with the imaging lens.

[0048] In an exemplary embodiment, the combined focal length F456 of the fourth, fifth, and sixth lenses, and the effective focal length f7 of the seventh lens satisfy: -3.00 < F456 / f7 < -2.15. This embodiment reasonably controls this conditional range, enabling the system to achieve a reasonable beam transition from the first lens group to the seventh lens, suppressing coma and distortion, and stabilizing magnification.

[0049] In an exemplary embodiment, the effective focal length f9 of the ninth lens, the effective focal length f10 of the tenth lens, and the air gap T910 between the ninth and tenth lenses on the optical axis satisfy: -3.47 ≤ (f9 + f10) / T910 ≤ -2.40. This embodiment reasonably controls the range of this conditional expression, controls the position of the beam convergence point in this region, and prevents the beam convergence focal point from falling within the lens.

[0050] In an exemplary embodiment, the axial distance LG1 between the object-side surface of the first lens and the image-side surface of the sixth lens, and the effective focal length f2 of the second lens, satisfy: 0.40 < LG1 / f2 < 1.10. By reasonably controlling this conditional range, the second lens is prevented from undertaking too much or too little beam shaping, thereby stabilizing the first lens group's fundamental correction of axial chromatic aberration and spherical aberration.

[0051] In an exemplary embodiment, the radius of curvature R5 of the object-side surface of the third lens, the radius of curvature R6 of the image-side surface of the third lens, and the effective focal length f3 of the third lens satisfy: 0.95 ≤ (R5 + R6) / f3 ≤ 1.86. This embodiment reasonably controls the range of this conditional expression, optimizes the aberration contribution of the third lens, focuses on suppressing spherical aberration and coma, and also takes into account fabrication feasibility.

[0052] In an exemplary embodiment, the sum of the center thicknesses of all lenses from the tenth to the fourteenth lens, ∑CTG3, and the sum of the center thicknesses of all lenses from the seventh to the ninth lens, ∑CTG2, satisfy: 1.87 ≤ ∑CTG3 / ∑CTG2 ≤ 2.65. In this embodiment, ∑CTG2 serves as the entry segment for critical folding and magnification control, while ∑CTG3 serves as a more refined aberration shaping and exit matching. Reasonably controlling the range of this conditional expression ensures the subsequent correction capability while controlling the overall volume and center of gravity distribution.

[0053] In an exemplary embodiment, the combined focal length F12345 of the first, second, third, fourth, and fifth lenses, and the combined focal length F121314 of the twelfth, thirteenth, and fourteenth lenses satisfy: 7.15 < F12345 / F121314 < 9.75. By reasonably controlling this conditional range, the overall power distribution of the system meets the requirements of the front teleconverter: the front section provides the main magnification-related beam modification capability, and the rear section provides necessary aberration compensation and output beam matching.

[0054] In an exemplary embodiment, the combined focal length FG2 of the second lens group and the on-axis distance LG2 from the object side of the seventh lens to the image side of the ninth lens satisfy: 1.75 ≤ FG2 / LG2 ≤ 2.92. This embodiment reasonably controls this conditional range, achieving stable optical path deflection capability and aberration control within a compact space.

[0055] In an exemplary embodiment, the center thickness CT10 of the tenth lens, the refractive index N10 of the tenth lens, the center thickness CT11 of the eleventh lens, and the refractive index N11 of the eleventh lens satisfy: 0.30 < (CT10 × N10) / (CT11 × N11) < 1.40. This embodiment, by reasonably controlling this conditional range, can suppress the coupling of axial chromatic aberration and spherical aberration introduced by the tenth and eleventh cemented lens groups.

[0056] In another aspect, this application provides an optical system comprising a lens assembly provided in any embodiment of this application.

[0057] 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 fourteenth 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.

[0058] 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 a teleconverter. 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 preceding lens group to form a clear and usable 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 teleconverter, ultimately forming an image on the imaging surface. The imaging surface is, for example, the photosensitive surface of an image sensor.

[0059] Figure 1 A schematic diagram of the overall architecture of an optical system provided in this application is shown.

[0060] 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.

[0061] 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 positive optical power, and the third lens group G3 has positive optical power.

[0062] The first lens group G1 includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6. The first lens E1 has either positive or negative optical power, its object-side surface is convex, and its image-side surface is concave. The second lens E2 has positive optical power, its object-side surface is convex, and its image-side surface is convex. The third lens E3 has negative optical power, its object-side surface is concave, and its image-side surface is convex. The fourth lens E4 has positive optical power, its object-side surface is convex, and its image-side surface is convex. The fifth lens E5 has negative optical power, its object-side surface is concave, and its image-side surface is concave. The sixth lens E6 has positive optical power, its object-side surface is flat, its image-side surface is flat, and its object-side surface is a diffraction surface.

[0063] The second lens group G2 includes a seventh lens E7, an eighth lens E8, and a ninth lens E9. The seventh lens E7 has positive optical power and its object-side surface is convex. The eighth lens E8 has positive 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 convex, and its image-side surface is concave.

[0064] The third lens group G3 includes the tenth lens E10, the eleventh lens E11, the twelfth lens E12, the thirteenth lens E13, and the fourteenth lens E14. The tenth lens E10 has negative optical power, and both its object-side and image-side surfaces are concave. The eleventh lens E11 has positive optical power, and both its object-side and image-side surfaces are convex. The twelfth lens E12 has negative optical power, and both its object-side and image-side surfaces are convex. The thirteenth lens E13 has positive optical power, and both its object-side and image-side surfaces are convex. The fourteenth lens E14 has positive optical power and its object-side surface is convex.

[0065] Lens E1, lens E2, and lens E3 are cemented together; lens E4 and lens E5 are cemented together; lens E8 and lens E9 are cemented together; lens E10 and lens E11 are cemented together; and lens E12 and lens E13 are cemented together. Lens group 10 satisfies: 2.36≤f8 / CT8≤3.35; 2.05<FG1 / F123<2.65; 2.55≤FG2 / FG3≤3.33, where f8 is the effective focal length of lens E8, CT8 is the center thickness of lens E8, FG1 is the combined focal length of lens group G1, F123 is the combined focal length of lens E1, lens E2, and lens E3, FG2 is the combined focal length of lens group G2, and FG3 is the combined focal length of lens group G3.

[0066] 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.

[0067] 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.

[0068] 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 14 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 15.17mm, f=-50.46mm.

[0069] 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.

[0070] The first lens group G1 includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6.

[0071] 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 concave.

[0072] The second lens E2 has positive optical power, the object side S2 of the second lens E2 is convex, and the image side S3 of the second lens E2 is convex.

[0073] The third lens E3 has negative optical power. The object side S3 of the third lens E3 is concave, and the image side S4 of the third lens E3 is convex.

[0074] The fourth lens E4 has positive optical power. The object side S5 of the fourth lens E4 is convex, and the image side S6 of the fourth lens E4 is convex.

[0075] The fifth lens E5 has negative optical power. The object side S6 of the fifth lens E5 is concave, and the image side S7 of the fifth lens E5 is concave.

[0076] The sixth lens E6 has positive optical power. The object side S8 of the sixth lens E6 is a plane, the image side S9 of the sixth lens E6 is a plane, and the object side S8 of the sixth lens E6 is a diffraction surface.

[0077] The second lens group G2 includes the seventh lens E7, the eighth lens E8, and the ninth lens E9.

[0078] The seventh lens E7 has positive optical power. The object side S10 of the seventh lens E7 is convex, and the image side S11 of the seventh lens E7 is convex.

[0079] The eighth lens E8 has positive optical power. The object side S12 of the eighth lens E8 is convex, and the image side S13 of the eighth lens E8 is concave.

[0080] The ninth lens E9 has negative optical power. The object side S13 of the ninth lens E9 is convex, and the image side S14 of the ninth lens E9 is concave.

[0081] The third lens group G3 includes the tenth lens E10, the eleventh lens E11, the twelfth lens E12, the thirteenth lens E13, and the fourteenth lens E14.

[0082] The tenth lens E10 has negative optical power. The object side S15 of the tenth lens E10 is concave, and the image side S16 of the tenth lens E10 is concave.

[0083] The eleventh lens E11 has positive optical power. The object-side surface S16 of the eleventh lens E11 is convex, and the image-side surface S17 of the eleventh lens E11 is convex.

[0084] The twelfth lens E12 has negative optical power. The object-side surface S18 of the twelfth lens E12 is convex, and the image-side surface S19 of the twelfth lens E12 is concave.

[0085] The thirteenth lens E13 has positive optical power. The object side S19 of the thirteenth lens E13 is convex, and the image side S20 of the thirteenth lens E13 is convex.

[0086] The fourteenth lens E14 has positive optical power. The object-side surface S21 of the fourteenth lens E14 is convex, and the object-side surface S22 of the fourteenth lens E14 is convex.

[0087] Lens E1, lens E2, and lens E3 are cemented together; lens E4 and lens E5 are cemented together; lens E8 and lens E9 are cemented together; lens E10 and lens E11 are cemented together; and lens E12 and lens E13 are cemented together.

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

[0090] Table 1

[0091] The phase equation for the diffraction plane in lens group 10 is expressed as follows: , The phase profile is represented by d, and the diffraction order is represented by d. denoted by λ, where λ represents the reference wavelength, and r represents the radial coordinate.

[0092] Table 2 below gives the phase equation coefficients that can be used for the diffraction surface (i.e., the object side surface S8 of the sixth lens E6) in this embodiment.

[0093] Table 2

[0094] 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.

[0095] according to Figure 3-5 As can be seen, the optical system given in Example 1 can achieve good imaging quality.

[0096] 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 14 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 15.13mm, f=-50.33mm.

[0097] 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.

[0098] The first lens group G1 includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6.

[0099] The first lens E1 has negative optical power, the object side S1 of the first lens E1 is convex, and the image side S2 of the first lens E1 is concave.

[0100] The second lens E2 has positive optical power, the object side S2 of the second lens E2 is convex, and the image side S3 of the second lens E2 is convex.

[0101] The third lens E3 has negative optical power. The object side S3 of the third lens E3 is concave, and the image side S4 of the third lens E3 is convex.

[0102] The fourth lens E4 has positive optical power. The object side S5 of the fourth lens E4 is convex, and the image side S6 of the fourth lens E4 is convex.

[0103] The fifth lens E5 has negative optical power. The object side S6 of the fifth lens E5 is concave, and the image side S7 of the fifth lens E5 is concave.

[0104] The sixth lens E6 has positive optical power. The object side S8 of the sixth lens E6 is a plane, the image side S9 of the sixth lens E6 is a plane, and the object side S8 of the sixth lens E6 is a diffraction surface.

[0105] The second lens group G2 includes the seventh lens E7, the eighth lens E8, and the ninth lens E9.

[0106] The seventh lens E7 has positive optical power. The object side S10 of the seventh lens E7 is convex, and the image side S11 of the seventh lens E7 is convex.

[0107] The eighth lens E8 has positive optical power. The object side S12 of the eighth lens E8 is convex, and the image side S13 of the eighth lens E8 is concave.

[0108] The ninth lens E9 has negative optical power. The object side S13 of the ninth lens E9 is convex, and the image side S14 of the ninth lens E9 is concave.

[0109] The third lens group G3 includes the tenth lens E10, the eleventh lens E11, the twelfth lens E12, the thirteenth lens E13, and the fourteenth lens E14.

[0110] The tenth lens E10 has negative optical power. The object side S15 of the tenth lens E10 is concave, and the image side S16 of the tenth lens E10 is concave.

[0111] The eleventh lens E11 has positive optical power. The object-side surface S16 of the eleventh lens E11 is convex, and the image-side surface S17 of the eleventh lens E11 is convex.

[0112] The twelfth lens E12 has negative optical power. The object-side surface S18 of the twelfth lens E12 is convex, and the image-side surface S19 of the twelfth lens E12 is concave.

[0113] The thirteenth lens E13 has positive optical power. The object side S19 of the thirteenth lens E13 is convex, and the image side S20 of the thirteenth lens E13 is convex.

[0114] The fourteenth lens E14 has positive optical power. The object-side surface S21 of the fourteenth lens E14 is convex, and the object-side surface S22 of the fourteenth lens E14 is convex.

[0115] Lens E1, lens E2, and lens E3 are cemented together; lens E4 and lens E5 are cemented together; lens E8 and lens E9 are cemented together; lens E10 and lens E11 are cemented together; and lens E12 and lens E13 are cemented together.

[0116] 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.

[0117] The basic parameters of lens group 10 in Embodiment 2 are shown in Table 3.

[0118] Table 3

[0119] Table 4 below gives the phase equation coefficients that can be used for the diffraction surface (i.e., the object side surface S8 of the sixth lens E6) in this embodiment.

[0120] Table 4

[0121] Figure 7A 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.

[0122] according to Figure 7-9 It can be seen that the optical system given in Example 2 can achieve good imaging quality.

[0123] 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 14 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 15.13mm, f=-50.31mm.

[0124] 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.

[0125] The first lens group G1 includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6.

[0126] The first lens E1 has negative optical power, the object side S1 of the first lens E1 is convex, and the image side S2 of the first lens E1 is concave.

[0127] The second lens E2 has positive optical power, the object side S2 of the second lens E2 is convex, and the image side S3 of the second lens E2 is convex.

[0128] The third lens E3 has negative optical power. The object side S3 of the third lens E3 is concave, and the image side S4 of the third lens E3 is convex.

[0129] The fourth lens E4 has positive optical power. The object side S5 of the fourth lens E4 is convex, and the image side S6 of the fourth lens E4 is convex.

[0130] The fifth lens E5 has negative optical power. The object side S6 of the fifth lens E5 is concave, and the image side S7 of the fifth lens E5 is concave.

[0131] The sixth lens E6 has positive optical power. The object side S8 of the sixth lens E6 is a plane, the image side S9 of the sixth lens E6 is a plane, and the object side S8 of the sixth lens E6 is a diffraction surface.

[0132] The second lens group G2 includes the seventh lens E7, the eighth lens E8, and the ninth lens E9.

[0133] The seventh lens E7 has positive 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.

[0134] The eighth lens E8 has positive optical power. The object side S12 of the eighth lens E8 is convex, and the image side S13 of the eighth lens E8 is concave.

[0135] The ninth lens E9 has negative optical power. The object side S13 of the ninth lens E9 is convex, and the image side S14 of the ninth lens E9 is concave.

[0136] The third lens group G3 includes the tenth lens E10, the eleventh lens E11, the twelfth lens E12, the thirteenth lens E13, and the fourteenth lens E14.

[0137] The tenth lens E10 has negative optical power. The object side S15 of the tenth lens E10 is concave, and the image side S16 of the tenth lens E10 is concave.

[0138] The eleventh lens E11 has positive optical power. The object-side surface S16 of the eleventh lens E11 is convex, and the image-side surface S17 of the eleventh lens E11 is convex.

[0139] The twelfth lens E12 has negative optical power. The object-side surface S18 of the twelfth lens E12 is convex, and the image-side surface S19 of the twelfth lens E12 is concave.

[0140] The thirteenth lens E13 has positive optical power. The object side S19 of the thirteenth lens E13 is convex, and the image side S20 of the thirteenth lens E13 is convex.

[0141] The fourteenth lens E14 has positive optical power. The object-side surface S21 of the fourteenth lens E14 is convex, and the object-side surface S22 of the fourteenth lens E14 is convex.

[0142] Lens E1, lens E2, and lens E3 are cemented together; lens E4 and lens E5 are cemented together; lens E8 and lens E9 are cemented together; lens E10 and lens E11 are cemented together; and lens E12 and lens E13 are cemented together.

[0143] 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.

[0144] The basic parameters of lens group 10 in Embodiment 3 are shown in Table 5.

[0145] Table 5

[0146] Table 6 below gives the phase equation coefficients that can be used for the diffraction surface (i.e., the object side S8 of the sixth lens E6) in this embodiment.

[0147] Table 6

[0148] 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.

[0149] according to Figure 11-13 As can be seen, the optical system given in Example 3 can achieve good imaging quality.

[0150] 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 14 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 15.13mm, f=-50.40mm.

[0151] 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.

[0152] The first lens group G1 includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6.

[0153] The first lens E1 has negative optical power, the object side S1 of the first lens E1 is convex, and the image side S2 of the first lens E1 is concave.

[0154] The second lens E2 has positive optical power, the object side S2 of the second lens E2 is convex, and the image side S3 of the second lens E2 is convex.

[0155] The third lens E3 has negative optical power. The object side S3 of the third lens E3 is concave, and the image side S4 of the third lens E3 is convex.

[0156] The fourth lens E4 has positive optical power. The object side S5 of the fourth lens E4 is convex, and the image side S6 of the fourth lens E4 is convex.

[0157] The fifth lens E5 has negative optical power. The object side S6 of the fifth lens E5 is concave, and the image side S7 of the fifth lens E5 is concave.

[0158] The sixth lens E6 has positive optical power. The object side S8 of the sixth lens E6 is a plane, the image side S9 of the sixth lens E6 is a plane, and the object side S8 of the sixth lens E6 is a diffraction surface.

[0159] The second lens group G2 includes the seventh lens E7, the eighth lens E8, and the ninth lens E9.

[0160] The seventh lens E7 has positive 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.

[0161] The eighth lens E8 has positive optical power. The object side S12 of the eighth lens E8 is convex, and the image side S13 of the eighth lens E8 is concave.

[0162] The ninth lens E9 has negative optical power. The object side S13 of the ninth lens E9 is convex, and the image side S14 of the ninth lens E9 is concave.

[0163] The third lens group G3 includes the tenth lens E10, the eleventh lens E11, the twelfth lens E12, the thirteenth lens E13, and the fourteenth lens E14.

[0164] The tenth lens E10 has negative optical power. The object side S15 of the tenth lens E10 is concave, and the image side S16 of the tenth lens E10 is concave.

[0165] The eleventh lens E11 has positive optical power. The object-side surface S16 of the eleventh lens E11 is convex, and the image-side surface S17 of the eleventh lens E11 is convex.

[0166] The twelfth lens E12 has negative optical power. The object-side surface S18 of the twelfth lens E12 is convex, and the image-side surface S19 of the twelfth lens E12 is concave.

[0167] The thirteenth lens E13 has positive optical power. The object side S19 of the thirteenth lens E13 is convex, and the image side S20 of the thirteenth lens E13 is convex.

[0168] The fourteenth lens E14 has positive optical power. The object-side surface S21 of the fourteenth lens E14 is convex, and the object-side surface S22 of the fourteenth lens E14 is concave.

[0169] Lens E1, lens E2, and lens E3 are cemented together; lens E4 and lens E5 are cemented together; lens E8 and lens E9 are cemented together; lens E10 and lens E11 are cemented together; and lens E12 and lens E13 are cemented together.

[0170] 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.

[0171] The basic parameters of lens group 10 in Embodiment 4 are shown in Table 7.

[0172] Table 7

[0173] Table 8 below gives the phase equation coefficients that can be used for the diffraction surface (i.e., the object side S8 of the sixth lens E6) in this embodiment.

[0174] Table 8

[0175] 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.

[0176] according to Figure 15-17 As can be seen, the optical system given in Example 4 can achieve good imaging quality.

[0177] 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 14 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 15.13mm, f=-59.80mm.

[0178] 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.

[0179] The first lens group G1 includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a sixth lens E6.

[0180] 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 concave.

[0181] The second lens E2 has positive optical power, the object side S2 of the second lens E2 is convex, and the image side S3 of the second lens E2 is convex.

[0182] The third lens E3 has negative optical power. The object side S3 of the third lens E3 is concave, and the image side S4 of the third lens E3 is convex.

[0183] The fourth lens E4 has positive optical power. The object side S5 of the fourth lens E4 is convex, and the image side S6 of the fourth lens E4 is convex.

[0184] The fifth lens E5 has negative optical power. The object side S6 of the fifth lens E5 is concave, and the image side S7 of the fifth lens E5 is concave.

[0185] The sixth lens E6 has positive optical power. The object side S8 of the sixth lens E6 is a plane, the image side S9 of the sixth lens E6 is a plane, and the object side S8 of the sixth lens E6 is a diffraction surface.

[0186] The second lens group G2 includes the seventh lens E7, the eighth lens E8, and the ninth lens E9.

[0187] The seventh lens E7 has positive optical power. The object side S10 of the seventh lens E7 is convex, and the image side S11 of the seventh lens E7 is convex.

[0188] The eighth lens E8 has positive optical power. The object side S12 of the eighth lens E8 is convex, and the image side S13 of the eighth lens E8 is concave.

[0189] The ninth lens E9 has negative optical power. The object side S13 of the ninth lens E9 is convex, and the image side S14 of the ninth lens E9 is concave.

[0190] The third lens group G3 includes the tenth lens E10, the eleventh lens E11, the twelfth lens E12, the thirteenth lens E13, and the fourteenth lens E14.

[0191] The tenth lens E10 has negative optical power. The object side S15 of the tenth lens E10 is concave, and the image side S16 of the tenth lens E10 is concave.

[0192] The eleventh lens E11 has positive optical power. The object-side surface S16 of the eleventh lens E11 is convex, and the image-side surface S17 of the eleventh lens E11 is convex.

[0193] The twelfth lens E12 has negative optical power. The object-side surface S18 of the twelfth lens E12 is convex, and the image-side surface S19 of the twelfth lens E12 is concave.

[0194] The thirteenth lens E13 has positive optical power. The object side S19 of the thirteenth lens E13 is convex, and the image side S20 of the thirteenth lens E13 is convex.

[0195] The fourteenth lens E14 has positive optical power. The object-side surface S21 of the fourteenth lens E14 is convex, and the object-side surface S22 of the fourteenth lens E14 is convex.

[0196] Lens E1, lens E2, and lens E3 are cemented together; lens E4 and lens E5 are cemented together; lens E8 and lens E9 are cemented together; lens E10 and lens E11 are cemented together; and lens E12 and lens E13 are cemented together.

[0197] 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.

[0198] The basic parameters of lens group 10 in Embodiment 5 are shown in Table 9.

[0199] Table 9

[0200] Table 10 below gives the phase equation coefficients that can be used for the diffraction surface (i.e., the object side S8 of the sixth lens E6) in this embodiment.

[0201] Table 10

[0202] 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.

[0203] according to Figure 19-21 As can be seen, the optical system given in Example 5 can achieve good imaging quality.

[0204] Some optical parameters of Examples 1 to 5 are shown in Table 11 (unit: mm). The conditions satisfied by Examples 1 to 5 are shown in Table 12.

[0205] Table 11

[0206] Table 12

[0207] 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.

[0208] 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 group, a second lens group, and a third lens group, wherein, The first lens group has positive optical power, and the first lens group includes: A first lens having positive or negative optical power, wherein the object-side surface of the first lens is convex and the image-side surface of the first lens is concave; A second lens having 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 convex; 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; A sixth lens having positive optical power, wherein the object-side surface of the sixth lens is a plane, the image-side surface of the sixth lens is a plane, and the object-side surface of the sixth lens is a diffraction surface; The second lens group has positive optical power, and the second lens group includes: A seventh lens having positive optical power, wherein the object-side surface of the seventh lens is convex; An eighth lens with positive 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 convex and the image-side surface of the ninth lens is concave; The third lens group has positive optical power, and the third lens group includes: A tenth lens with negative optical power, wherein the object-side surface of the tenth lens is concave and the image-side surface of the tenth lens is concave; An eleventh lens with positive optical power, wherein the object-side surface of the eleventh lens is convex and the image-side surface of the eleventh lens is convex; A twelfth lens with negative optical power, wherein the object-side surface of the twelfth lens is convex and the image-side surface of the twelfth lens is concave; A thirteenth lens with positive optical power, wherein the object-side surface of the thirteenth lens is convex and the image-side surface of the thirteenth lens is convex; A fourteenth lens with positive optical power, wherein the object-side surface of the fourteenth lens is convex; Wherein, the first lens, the second lens, and the third lens are cemented together; the fourth lens and the fifth lens are cemented together; the eighth lens and the ninth lens are cemented together; the tenth lens and the eleventh lens are cemented together; and the twelfth lens and the thirteenth lens are cemented together. The lens group satisfies: 2.36≤f8 / CT8≤3.35; 2.05<FG1 / F123<2.65; 2.55≤FG2 / FG3≤3.33, Wherein, f8 is the effective focal length of the eighth lens, CT8 is the center thickness of the eighth lens, FG1 is the combined focal length of the first lens group, F123 is the combined focal length of the first lens, the second lens and the third lens, FG2 is the combined focal length of the second lens group, and FG3 is the combined focal length of the third lens group.

2. The lens assembly according to claim 1, wherein, The combined focal length F45 of the fourth lens and the fifth lens, the center thickness CT4 of the fourth lens, and the center thickness CT5 of the fifth lens satisfy: -11.85 < F45 / (CT4+CT5) < -9.

40.

3. The lens assembly according to claim 1, wherein, The axial distance TD between the object side of the first lens and the image side of the fourteenth lens, the air gap T56 between the fifth and sixth lenses on the optical axis, and the air gap T67 between the sixth and seventh lenses on the optical axis satisfy: 2.15 < TD / (T56 + T67) < 2.

95.

4. The lens assembly according to claim 1, wherein, The combined focal length F89 of the eighth lens and the ninth lens, the radius of curvature R15 of the object side of the eighth lens, and the radius of curvature R18 of the image side of the ninth lens satisfy: -3.15≤F89 / (R15+R18)<-2.

70.

5. The lens assembly according to claim 1, wherein, The effective focal length f4 of the fourth lens and the sum of the center thicknesses of all lenses from the first lens to the sixth lens, ∑CTG1, satisfy: 2.75≤f4 / ∑CTG1<3.

25.

6. The lens assembly according to claim 1, wherein, The combined focal length F1213 of the twelfth and thirteenth lenses and the on-axis distance LG3 from the object side of the tenth lens to the image side of the fourteenth lens satisfy the following condition: 1.20 < F1213 / LG3 < 2.

05.

7. The lens assembly according to claim 1, wherein, The radius of curvature R28 of the image side of the fourteenth lens and the center thickness CT14 of the fourteenth lens satisfy: 6.65≤|R28| / CT14≤15.

67.

8. The lens assembly according to claim 1, wherein, The effective focal length f14 of the fourteenth lens, the effective focal length f12 of the twelfth lens, and the effective focal length f13 of the thirteenth lens satisfy the following condition: -2.95 < f14 / (f12+f13) < -1.

15.

9. The lens assembly according to claim 1, wherein, The combined focal length F456 of the fourth lens, the fifth lens, and the sixth lens, and the effective focal length f7 of the seventh lens satisfy: -3.00 < F456 / f7 < -2.

15.

10. The lens assembly according to claim 1, wherein, The effective focal length f9 of the ninth lens, the effective focal length f10 of the tenth lens, and the air gap T910 between the ninth and tenth lenses on the optical axis satisfy: -3.47≤(f9+f10) / T910≤-2.

40.

11. The lens assembly according to claim 1, wherein, The axial distance LG1 from the object-side surface of the first lens to the image-side surface of the sixth lens and the effective focal length f2 of the second lens satisfy the following: 0.40 < LG1 / f2 < 1.

10.

12. The lens assembly according to claim 1, wherein, The radius of curvature R5 of the object side of the third lens, the radius of curvature R6 of the image side of the third lens, and the effective focal length f3 of the third lens satisfy: 0.95≤(R5+R6) / f3≤1.

86.

13. The lens assembly according to claim 1, wherein, The sum of the center thicknesses of all lenses from the tenth lens to the fourteenth lens, ∑CTG3, and the sum of the center thicknesses of all lenses from the seventh lens to the ninth lens, ∑CTG2, satisfy the following condition: 1.87 ≤ ∑CTG3 / ∑CTG2 ≤ 2.

65.

14. The lens assembly according to claim 1, wherein, The combined focal lengths F12345 of the first, second, third, fourth, and fifth lenses, and the combined focal lengths F121314 of the twelfth, thirteenth, and fourteenth lenses satisfy the following condition: 7.15 < F12345 / F121314 < 9.

75.

15. The lens assembly according to claim 1, wherein, The combined focal length FG2 of the second lens group and the on-axis distance LG2 from the object side of the seventh lens to the image side of the ninth lens satisfy: 1.75≤FG2 / LG2≤2.

92.

16. The lens assembly according to claim 1, wherein, The center thickness CT10 of the tenth lens, the refractive index N10 of the tenth lens, the center thickness CT11 of the eleventh lens, and the refractive index N11 of the eleventh lens satisfy the following condition: 0.30 < (CT10 × N10) / (CT11 × N11) < 1.

40.

17. An optical system comprising a lens assembly according to any one of claims 1-16.

18. The optical system according to claim 17, wherein, The optical system also includes an imaging lens and an imaging surface located on the image side of the fourteenth 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.

19. An electronic device comprising the optical system of claim 18.

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