Lens set, optical system, and electronic device

Abstract

The application provides a lens set, an optical system and an electronic device, and relates to the optical field. The lens set comprises a first lens set and a second lens set, the first lens set comprises a first lens to a sixth lens, the second lens set comprises a seventh lens to a fifteenth lens, 1.85 < LG2 / FG2 < 2.45, 16.50 < FG1 / AL < 19.90, LG2 is the axial distance from the object side surface of the seventh lens to the image side surface of the fifteenth lens, FG2 is the combined focal length of the second lens set, FG1 is the combined focal length of the first lens set, and AL is the distance that the first lens set moves along the optical axis when the lens set changes from an infinite object distance state to a 1000mm object distance state. The lens set realizes the comprehensive balance of long-focus zooming capability, image quality correction and processing reliability.

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] While the telephoto capabilities of smartphones are constantly improving, the focal length extension range of built-in lenses remains a bottleneck due to limitations in thickness and internal space. External attachment lenses can further extend the magnification; however, existing products are mostly fixed-focus, single-lens structures, which not only make it difficult to correct various aberrations after attachment but also lack focusing mechanisms for different shooting distances, resulting in a significant decrease in actual image sharpness and contrast. Summary of the Invention

[0003] One aspect of this application provides a lens assembly, which includes a first lens group and a second 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; a second lens with positive optical power, whose object side and image side are both convex; a third lens with negative optical power, whose object side is concave; a fourth lens with positive optical power, whose object side and image side are both convex; and a fifth lens with negative optical power, whose object side and image side are both convex. All are concave; the sixth lens, with positive optical power, has an image-side surface that is convex; the second lens group has positive optical power and includes: a seventh lens, with positive optical power, whose object-side surface is convex and image-side surface is concave; an eighth lens, with positive optical power, whose object-side surface is convex; a ninth lens, with negative optical power, whose image-side surface is concave; a tenth lens, with negative optical power, whose object-side and image-side surfaces are both concave; an eleventh lens, with positive optical power, whose object-side surface is convex; and a twelfth lens, with negative optical power, whose object-side and image-side surfaces are both concave. The first lens has concave object and image sides; the thirteenth lens, with positive optical power, has convex object and image sides; the fourteenth lens, with positive optical power, has convex object and image sides; the fifteenth lens, with positive optical power, has a convex object side; the 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; the first lens... The lens group can move along the optical axis to achieve zoom; and satisfies: 1.85 < LG2 / FG2 < 2.45; 16.50 < FG1 / ΔL < 19.90; where LG2 is the axial distance from the object side of the seventh lens to the image side of the fifteenth lens, FG2 is the combined focal length of the second lens group, FG1 is the combined focal length of the first lens group, and ΔL is the distance the first lens group moves along the optical axis when the lens group changes from an infinite object distance state to a 1000mm object distance state.

[0004] According to an embodiment of this application, the lens group satisfies: 2.50 < f11 / (CT10+CT11) < 4.60, where f11 is the effective focal length of the eleventh lens, CT10 is the center thickness of the tenth lens, and CT11 is the center thickness of the eleventh lens.

[0005] According to an embodiment of this application, the lens group satisfies: -11.85 < F45 / T56 < -7.20, where F45 is the combined focal length of the fourth lens and the fifth lens, and T56 is the air gap between the fifth lens and the sixth lens on the optical axis.

[0006] According to an embodiment of this application, the lens group satisfies: 2.20 < F123 / ∑CTG1 ≤ 3.35, where F123 is the combined focal length of the first lens, the second lens, and the third lens, and ∑CTG1 is the sum of the center thicknesses of all lenses from the first lens to the sixth lens.

[0007] According to an embodiment of this application, the lens group satisfies: 1.50 < ∑CTG2 / F1415 < 2.20, where ∑CTG2 is the sum of the center thicknesses of all lenses from the seventh lens to the fifteenth lens, and F1415 is the combined focal length of the fourteenth lens and the fifteenth lens.

[0008] According to an embodiment of this application, the lens group satisfies: 1.15 < f6 / LG1 < 1.55, where f6 is the effective focal length of the sixth lens and LG1 is the on-axis distance from the object side of the first lens to the image side of the sixth lens.

[0009] According to an embodiment of this application, the lens group satisfies: -5.40 < F89 / (R15+R18) < -2.05, where F89 is the combined focal length of the eighth lens and the ninth lens, R15 is the radius of curvature of the object side of the eighth lens, and R18 is the radius of curvature of the image side of the ninth lens.

[0010] According to an embodiment of this application, the lens group satisfies: 1.75 < f8 / T78 < 3.30, where f8 is the effective focal length of the eighth 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: -9.40 < R12 / CT6 < -5.70, where R12 is the radius of curvature of the image side of the sixth lens, and CT6 is the center thickness of the sixth lens.

[0012] According to an embodiment of this application, the lens group satisfies: 1.65 < (f15 × N15) / (f14 × N14) < 2.00, where f15 is the effective focal length of the fifteenth lens, N15 is the refractive index of the fifteenth lens, f14 is the effective focal length of the fourteenth lens, and N14 is the refractive index of the fourteenth lens.

[0013] According to an embodiment of this application, the lens group satisfies: 3.80 < (CT8 + CT9) / CT7 < 6.40, where CT8 is the center thickness of the eighth lens, CT9 is the center thickness of the ninth lens, and CT7 is the center thickness of the seventh lens.

[0014] According to an embodiment of this application, the lens group satisfies: 10.25≤LG1 / ΔL<12.90, where LG1 is the axial distance from the object side of the first lens to the image side of the sixth lens.

[0015] According to an embodiment of this application, the lens group satisfies: 1.15 < (CT12 + CT13) / (f12 + f13) < 1.90, where CT12 is the center thickness of the twelfth lens, CT13 is the center thickness of the thirteenth lens, f12 is the effective focal length of the twelfth lens, and f13 is the effective focal length of the thirteenth lens.

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

[0017] According to an embodiment of this application, the optical system further includes an imaging lens and an imaging surface located on the image side of the 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.

[0018] According to an embodiment of this application, the optical system satisfies: -2.10 < fw / ∑CTG1 < -1.35, where fw is the effective focal length of the optical system at an object distance of 1000mm, and ∑CTG1 is the sum of the center thicknesses of all lenses from the first lens to the sixth lens.

[0019] According to the embodiments of this application, the optical system satisfies: 1.65 < Δf / ΔL < 2.15, where Δf is the change in effective focal length of the optical system when it changes from an infinite object distance state to a 1000mm object distance state.

[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 two conditional expressions, 1.85 < LG2 / FG2 < 2.45 and 16.50 < FG1 / ΔL < 19.90, a comprehensive balance is achieved between telephoto zoom capability, image quality correction, and manufacturing reliability. The cemented groups of the eighth and ninth lenses, tenth and eleventh lenses, and twelfth and thirteenth lenses can effectively correct axial chromatic aberration and magnification chromatic aberration, and compensate for field curvature and astigmatism. Simultaneously, the overall length of the lens group is reasonably constrained, avoiding assembly sensitivity and thermal deformation risks. Ensuring that the movement of the first lens group from infinity to 1000mm object distance is moderate guarantees both focusing sensitivity and resolution, while reducing drive load and power consumption, thus improving zoom response speed and 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 This paper shows a schematic diagram of the lens assembly in the first state according to Embodiment 1 provided in this application; Figure 3 A schematic diagram of the on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical system of Embodiment 1 in the first state is shown. Figure 4 This paper shows a schematic diagram of the lens assembly in the second state according to Embodiment 1 provided in this application; Figure 5 A schematic diagram showing the on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical system of Embodiment 1 in the second state is shown. Figure 6 This paper shows a schematic diagram of the lens assembly in the first state according to Embodiment 2 provided in this application; Figure 7 A schematic diagram of the on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical system of Embodiment 2 in the first state is shown. Figure 8 This paper shows a schematic diagram of the lens assembly in the second state according to Embodiment 2 provided in this application; Figure 9 A schematic diagram of the on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical system of Embodiment 2 in the second state is shown. Figure 10 This paper shows a schematic diagram of the lens assembly in the first state according to Embodiment 3 provided in this application; Figure 11A schematic diagram of the on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical system of Embodiment 3 in the first state is shown. Figure 12 This paper shows a schematic diagram of the lens assembly in the second state according to Embodiment 3 of this application; Figure 13 A schematic diagram of the on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical system of Embodiment 3 in the second state is shown. Figure 14 This paper shows a schematic diagram of the lens assembly in the first state according to Embodiment 4 of this application; Figure 15 A schematic diagram of the on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical system of Embodiment 4 in the first state is shown. Figure 16 This paper shows a schematic diagram of the lens assembly in the second state according to Embodiment 4 of this application; Figure 17 A schematic diagram of the on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical system of Embodiment 4 in the second state is shown. Figure 18 This paper shows a schematic diagram of the lens assembly in the first state according to Embodiment 5 of this application; Figure 19 A schematic diagram of the on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical system of Embodiment 5 in the first state is shown. Figure 20 This paper shows a schematic diagram of the lens assembly in the second state according to Embodiment 5 of this application; Figure 21 A schematic diagram showing the on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical system of Embodiment 5 in the second state is shown. Figure 22 This paper shows a schematic diagram of the lens assembly in the first state according to Embodiment Six of this application; Figure 23 A schematic diagram of the on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical system of Embodiment Six in the first state is shown. Figure 24 This invention provides a schematic diagram of the lens assembly in the second state according to Embodiment Six. Figure 25 A schematic diagram of the on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical system of Embodiment Six in the second state is shown. Figure 26 This paper shows a schematic diagram of the lens assembly in the first state according to Embodiment 7 provided in this application; Figure 27A schematic diagram of the on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical system of Embodiment 7 in the first state is shown. Figure 28 This application shows a schematic diagram of the lens assembly in the second state according to Embodiment Seven; and Figure 29 A schematic diagram of the on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical system of Embodiment 7 in the second state 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 proposes a two-lens group (referred to as "first lens group" and "second lens group") extended optical system for telephoto lenses adapted to electronic devices. By changing the axial spacing of the first lens group, zoom function can be achieved at different object distances, and good telephoto magnification effect can still be obtained under non-native image quality conditions.

[0033] This application provides a lens assembly, which includes a first lens group and a second lens group in sequence from the object side to the image side along the optical axis.

[0034] The first lens group has positive optical power and includes: a first lens with positive optical power; 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; 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; and a sixth lens with positive optical power, wherein the image-side surface of the sixth lens is convex.

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

[0036] The 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; the first lens group can move along the optical axis to achieve zoom; and satisfies: 1.85 < LG2 / FG2 < 2.45; 16.50 < FG1 / ΔL < 19.90; where LG2 is the on-axis distance from the object side of the seventh lens to the image side of the fifteenth lens, FG2 is the combined focal length of the second lens group, FG1 is the combined focal length of the first lens group, and ΔL is the distance the first lens group moves along the optical axis when the lens group changes from an infinite object distance to a 1000mm object distance.

[0037] The lens group provided in this application achieves a comprehensive balance between telephoto zoom capability, image quality correction, and manufacturing reliability through the synergistic constraints of two conditional formulas: 1.85 < LG2 / FG2 < 2.45 and 16.50 < FG1 / ΔL < 19.90. The cemented groups of the eighth and ninth, tenth and eleventh, and twelfth lenses effectively correct axial chromatic aberration and magnification chromatic aberration, and compensate for field curvature and astigmatism. Simultaneously, the overall length of the lens group is reasonably constrained, avoiding assembly sensitivity and thermal deformation risks. This ensures that the movement of the first lens group from infinity to 1000mm object distance is moderate, guaranteeing both focusing sensitivity and resolution while reducing drive load and power consumption, thus improving zoom response speed and mass production stability.

[0038] In an exemplary embodiment, the lens group satisfies: 2.50 < f11 / (CT10+CT11) < 4.60, where f11 is the effective focal length of the eleventh lens, CT10 is the center thickness of the tenth lens, and CT11 is the center thickness of the eleventh lens. This embodiment reasonably controls the range of the above conditional expression, so that the focal length of the eleventh lens matches the sum of the center thicknesses of the tenth and eleventh lenses, resulting in smooth light deflection, effectively suppressing the generation of advanced aberrations, and reducing the processing and assembly sensitivity of the cemented surface, which is beneficial to improving the mass production yield.

[0039] In an exemplary embodiment, the lens group satisfies: -11.85 < F45 / T56 < -7.20, where F45 is the combined focal length of the fourth and fifth lenses, and T56 is the air gap between the fifth and sixth lenses on the optical axis. This embodiment reasonably controls the range of the above-mentioned conditional expression, enabling the cemented lens group composed of the fourth and fifth lenses to provide a moderate negative optical power. Combined with the air gap between the fifth and sixth lenses, it effectively corrects transverse chromatic aberration and field curvature, while ensuring smooth light transition, avoiding excessive astigmatism or assembly sensitivity, and helping to maintain uniform image quality across the entire field of view.

[0040] In an exemplary embodiment, the lens group satisfies: 2.20 < F123 / ∑CTG1 ≤ 3.35, where F123 is the combined focal length of the first, second, and third lenses, and ∑CTG1 is the sum of the center thicknesses of all lenses from the first to the sixth lens. This embodiment reasonably controls the range of the above conditional expression, ensuring that the combined focal length of the first three lenses matches the total thickness of the first lens group, effectively compressing the radial dimension of the lens group and suppressing spherical aberration, while reserving sufficient space for aberration compensation of the subsequent lens groups, thus ensuring the stability of image quality across the entire field of view during zooming.

[0041] In an exemplary embodiment, the lens group satisfies: 1.50 < ∑CTG2 / F1415 < 2.20, where ∑CTG2 is the sum of the center thicknesses of all lenses from the seventh to the fifteenth lens, and F1415 is the combined focal length of the fourteenth and fifteenth lenses. This embodiment reasonably controls the range of the above conditional expression, so that the total thickness of the second lens group is coordinated with the combined focal length of the fourteenth and fifteenth lenses, ensuring that the latter group has sufficient optical power to converge the imaging light rays, while avoiding excessive thickness of the second lens group leading to structural redundancy. This helps to shorten the overall optical length, improve the system compactness, and reduce image plane drift caused by temperature changes.

[0042] In an exemplary embodiment, the lens group satisfies: 1.15 < f6 / LG1 < 1.55, where f6 is the effective focal length of the sixth lens, and LG1 is the axial distance from the object-side surface of the first lens to the image-side surface of the sixth lens. This embodiment reasonably controls the range of the above conditional expression, ensuring that the focal length of the sixth lens matches the axial length of the first lens group. This guarantees that the end of the group has a suitable positive optical power to focus the light, while avoiding the introduction of additional aberrations due to excessively short focal lengths or excessively long groups. This helps maintain a smooth transition of the beam angle during zooming and reduces the correction pressure on subsequent lenses.

[0043] In an exemplary embodiment, the lens group satisfies: -5.40 < F89 / (R15+R18) < -2.05, where F89 is the combined focal length of the eighth and ninth lenses, R15 is the radius of curvature of the object-side surface of the eighth lens, and R18 is the radius of curvature of the image-side surface of the ninth lens. This embodiment reasonably controls the range of the above-mentioned conditional expression, so that the cemented group composed of the eighth and ninth lenses has a moderate negative optical power. By matching the sum of the radii of curvature of the object-side and image-side surfaces, it effectively eliminates axial chromatic aberration and higher-order spherical aberration, while avoiding excessive curvature of the surface, thus reducing the difficulty of lens processing and cementing.

[0044] In an exemplary embodiment, the lens group satisfies: 1.75 < f8 / T78 < 3.30, where f8 is the effective focal length of the eighth lens, and T78 is the air gap between the seventh and eighth lenses on the optical axis. This embodiment reasonably controls the range of the above conditional expression, ensuring that the focal length of the eighth lens matches the air gap between the seventh and eighth lenses. This guarantees a smooth deflection of light when transitioning from the seventh lens to the eighth lens, effectively suppressing astigmatism and coma. Simultaneously, it provides a generous tolerance margin for the assembly of the two lenses, which is beneficial for improving production efficiency.

[0045] In an exemplary embodiment, the lens group satisfies: -9.40 < R12 / CT6 < -5.70, where R12 is the radius of curvature of the image-side surface of the sixth lens, and CT6 is the center thickness of the sixth lens. This embodiment reasonably controls the range of the above conditional expression, ensuring that the radius of curvature of the image-side surface of the sixth lens is in a suitable ratio to its center thickness, avoiding excessive curvature of the surface or excessive thinness of the lens, which helps to reduce astigmatism and distortion contributions, while ensuring the yield of the lens injection molding or compression molding process.

[0046] In an exemplary embodiment, the lens group satisfies: 1.65 < (f15 × N15) / (f14 × N14) < 2.00, where f15 is the effective focal length of the fifteenth lens, N15 is the refractive index of the fifteenth lens, f14 is the effective focal length of the fourteenth lens, and N14 is the refractive index of the fourteenth lens. This embodiment reasonably controls the range of the above conditional expression, so that the optical power and material refractive index of the fourteenth and fifteenth lenses are coordinated with each other, ensuring that the rear lens group can effectively gather light and compensate for residual field curvature, while avoiding high-order aberrations caused by excessive optical power or excessive refractive index difference between the two lenses, which is beneficial to improving the sharpness of the entire field of view.

[0047] In an exemplary embodiment, the lens group satisfies: 3.80 < (CT8 + CT9) / CT7 < 6.40, where CT8 is the center thickness of the eighth lens, CT9 is the center thickness of the ninth lens, and CT7 is the center thickness of the seventh lens. This embodiment reasonably controls the range of the above conditional expression to ensure that the overall stiffness of the cemented assembly of the eighth and ninth lenses is moderate, avoiding uneven molding stress or thermal deformation caused by significant thickness differences, while ensuring a smooth transition of light from the seventh lens to the cemented assembly and suppressing abrupt changes in local aberrations.

[0048] In an exemplary embodiment, the lens group satisfies: 10.25 ≤ LG1 / ΔL < 12.90, where LG1 is the axial distance from the object-side surface of the first lens to the image-side surface of the sixth lens. This embodiment reasonably controls the range of the above-mentioned conditional expression, so that the axial length of the first lens group matches the zoom movement distance, ensuring that there is sufficient space within the group to arrange multiple lenses to correct various aberrations. At the same time, the movement stroke is moderate, avoiding excessive burden on the drive mechanism, maintaining image plane stability throughout the zoom range, and reducing performance fluctuations caused by travel errors.

[0049] In an exemplary embodiment, the lens group satisfies: 1.15 < (CT12 + CT13) / (f12 + f13) < 1.90, where CT12 is the center thickness of the twelfth lens, CT13 is the center thickness of the thirteenth lens, f12 is the effective focal length of the twelfth lens, and f13 is the effective focal length of the thirteenth lens. This embodiment reasonably controls the range of the above conditional expression, so that the sum of the thicknesses of the twelfth and thirteenth lenses matches the sum of their focal lengths. This avoids excessive thickness leading to lens group redundancy or excessively short focal lengths introducing advanced aberrations. At the same time, it is beneficial to improve the chromatic aberration correction effect over a wide spectral range and reduce the processing stress of the cemented surface.

[0050] In another aspect, this application provides an optical system including a lens assembly provided in any embodiment of this application.

[0051] 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.

[0052] In an exemplary embodiment, the optical system satisfies: -2.10 < fw / ∑CTG1 < -1.35, where fw is the effective focal length of the optical system at a 1000mm object distance, and ∑CTG1 is the sum of the center thicknesses of all lenses from the first to the sixth lens. This embodiment reasonably controls the range of the above conditional expression, ensuring that the system focal length at a 1000mm object distance matches the total thickness of the first lens group. This guarantees that the system has a moderate negative optical power in close-up scenarios, effectively compensating for the image plane curvature caused by the shortened object distance, while avoiding an excessively negative focal length that would lead to an excessively large field of view or a surge in aberrations. This is beneficial for maintaining full-field sharpness during close-up shooting.

[0053] In an exemplary embodiment, the optical system satisfies: 1.65 < Δf / ΔL < 2.15, where Δf is the change in effective focal length when the optical system changes from an infinite object distance to a 1000mm object distance. This embodiment reasonably controls the range of the above conditional expression, ensuring that the change in system focal length is coordinated with the movement of the first lens group, guaranteeing smooth and sensitive magnification adjustment during zooming, while avoiding focusing lag due to excessively long movement or insufficient resolution due to excessively short movement.

[0054] In another aspect, this application provides an electronic device that includes the optical system provided in any embodiment of this application.

[0055] 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.

[0056] Figure 1 A schematic diagram of the overall architecture of an optical system provided in this application is shown.

[0057] 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.

[0058] The lens group 10 includes a first lens group G1 and a second lens group G2. The first lens group G1 has positive optical power, and the second lens group G2 has positive optical power.

[0059] 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 positive optical power. 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. The sixth lens has positive optical power, and its image-side surface is convex.

[0060] The second lens group G2 includes lens E7, lens E8, lens E9, lens E10, lens E11, lens E12, lens E13, lens E14, and lens E15. Lens E7 has positive optical power, a convex object-side surface, and a concave image-side surface. Lens E8 has positive optical power, and a convex object-side surface. Lens E9 has negative optical power, and a concave image-side surface. Lens E10 has negative optical power, and both its object and image-side surfaces are concave. Lens E11 has positive optical power, and its object-side surface is convex. Lens E12 has negative optical power, and both its object and image-side surfaces are concave. Lens E13, the thirteenth lens, has positive optical power. Both its object-side and image-side surfaces are convex. Lens E14, the fourteenth lens, also has positive optical power. Both its object-side and image-side surfaces are convex. Lens E15, the fifteenth lens, also has positive optical power.

[0061] 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 eighth lens E8 and the ninth lens E9 are cemented together; the tenth lens E10 and the eleventh lens E11 are cemented together; and the twelfth lens E12 and the thirteenth lens E13 are cemented together. The first lens group G1 can move along the optical axis to achieve zoom. And it satisfies: 1.85 < LG2 / FG2 < 2.45; 16.50 < FG1 / ΔL < 19.90. LG2 is the on-axis distance from the object side of the seventh lens E7 to the image side of the fifteenth lens E15; FG2 is the combined focal length of the second lens group G2; FG1 is the combined focal length of the first lens group G1; and ΔL is the distance that the first lens group G1 moves along the optical axis when the lens group changes from an infinite object distance to a 1000mm object distance.

[0062] For example, light from an object passes sequentially through the corresponding surfaces of the first lens group G1, the second lens group G2, and the imaging lens 20, and is finally imaged on the imaging surface IMG.

[0063] 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.

[0064] 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 assembly 10 in the first state according to Embodiment 1 of this application is shown. Figure 3 A schematic diagram of the on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical system of Embodiment 1 in the first state is shown. Figure 4 A schematic diagram of the lens assembly 10 in the second state of Embodiment 1 provided in this application is shown. Figure 5 A schematic diagram of the on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical system of Embodiment 1 in the second state is shown.

[0065] In the embodiments of this application, the first state is, for example, an infinite object distance state, and the second state is, for example, a 1000mm object distance state. The second state is also called a macro state.

[0066] Example 1 includes 15 lenses. The effective focal lengths fq (at infinite object distance) and fw (at 1000mm object distance) of the optical system in Example 1 are both effective focal lengths when adapted to an imaging lens with a focal length of 22.48mm. The specific data for fq and fw in Example 1 are shown in the table below.

[0067] like Figure 2 and 4 As shown, the lens group 10 includes a first lens group G1 and a second lens group G2.

[0068] 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 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 convex.

[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 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.

[0075] The second lens group G2 includes the seventh lens E7, the eighth lens E8, the ninth lens E9, the tenth lens E10, the eleventh lens E11, the twelfth lens E12, the thirteenth lens E13, the fourteenth lens E14, and the fifteenth lens E15. The second lens group G2 has positive optical power.

[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 positive optical power. The object-side surface S13 of the eighth lens E8 is convex, and the image-side surface S14 of the eighth lens E8 is convex.

[0078] The ninth lens E9 has negative optical power. The object-side surface S14 of the ninth lens E9 is concave, and the image-side surface S15 of the ninth lens E9 is concave.

[0079] The tenth lens E10 has negative optical power. The object side S16 of the tenth lens E10 is concave, and the image side S17 of the tenth lens E10 is concave.

[0080] The eleventh lens E11 has positive optical power. The object-side surface S17 of the eleventh lens E11 is convex, and the image-side surface S18 of the eleventh lens E11 is convex.

[0081] The twelfth lens E12 has negative optical power. The object side S19 of the twelfth lens E12 is concave, and the image side S20 of the twelfth lens E12 is concave.

[0082] The thirteenth lens E13 has positive optical power. The object-side surface S20 of the thirteenth lens E13 is convex, and the image-side surface S21 of the thirteenth lens E13 is convex.

[0083] The fourteenth lens E14 has positive optical power. The object side surface S22 of the fourteenth lens E14 is convex, and the image side surface S23 of the fourteenth lens E14 is convex.

[0084] The fifteenth lens E15 has positive optical power. The object-side surface S24 of the fifteenth lens E15 is convex, and the image-side surface S25 of the fifteenth lens E15 is convex.

[0085] 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 eighth lens E8 and the ninth lens E9 are cemented together; the tenth lens E10 and the eleventh lens E11 are cemented together; and the twelfth lens E12 and the thirteenth lens E13 are cemented together.

[0086] The basic parameters of lens group 10 in the following embodiment are shown in Table 1. The values ​​of D1 and D2 in Table 1 are shown in Table 2.

[0087] Table 1

[0088] Table 2

[0089] like Figure 3 As shown, the optical system described in Example 1 achieves good imaging quality in the first state. Figure 5 As shown, the optical system given in Example 1 can achieve good imaging quality in the second state.

[0090] 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 assembly 10 in the first state of Embodiment 2 provided in this application is shown. Figure 7 A schematic diagram of the on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical system of Embodiment 2 in the first state is shown. Figure 8 A schematic diagram of the lens assembly 10 in the second state of Embodiment 2 provided in this application is shown. Figure 9 A schematic diagram of the on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical system of Embodiment 2 in the second state is shown.

[0091] Example 2 includes 15 lenses. The effective focal lengths fq (at infinite object distance) and fw (at 1000mm object distance) of the optical system in Example 2 are both effective focal lengths when adapted to an imaging lens with a focal length of 22.48mm. Specific data for fq and fw in Example 2 are shown in the table below.

[0092] like Figure 6 and 8 As shown, the lens group 10 includes a first lens group G1 and a second lens group G2.

[0093] 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 group G1 has positive optical power.

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

[0095] The second lens E2 has 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.

[0096] 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 convex.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] The second lens group G2 includes the seventh lens E7, the eighth lens E8, the ninth lens E9, the tenth lens E10, the eleventh lens E11, the twelfth lens E12, the thirteenth lens E13, the fourteenth lens E14, and the fifteenth lens E15. The second lens group G2 has positive optical power.

[0101] 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.

[0102] The eighth lens E8 has positive optical power. The object-side surface S13 of the eighth lens E8 is convex, and the image-side surface S14 of the eighth lens E8 is concave.

[0103] The ninth lens E9 has negative optical power. The object-side surface S14 of the ninth lens E9 is convex, and the image-side surface S15 of the ninth lens E9 is concave.

[0104] The tenth lens E10 has negative optical power. The object side S16 of the tenth lens E10 is concave, and the image side S17 of the tenth lens E10 is concave.

[0105] The eleventh lens E11 has positive optical power. The object-side surface S17 of the eleventh lens E11 is convex, and the image-side surface S18 of the eleventh lens E11 is concave.

[0106] The twelfth lens E12 has negative optical power. The object side S19 of the twelfth lens E12 is concave, and the image side S20 of the twelfth lens E12 is concave.

[0107] The thirteenth lens E13 has positive optical power. The object-side surface S20 of the thirteenth lens E13 is convex, and the image-side surface S21 of the thirteenth lens E13 is convex.

[0108] The fourteenth lens E14 has positive optical power. The object side surface S22 of the fourteenth lens E14 is convex, and the image side surface S23 of the fourteenth lens E14 is convex.

[0109] The fifteenth lens E15 has positive optical power. The object-side surface S24 of the fifteenth lens E15 is convex, and the image-side surface S25 of the fifteenth lens E15 is convex.

[0110] 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 eighth lens E8 and the ninth lens E9 are cemented together; the tenth lens E10 and the eleventh lens E11 are cemented together; and the twelfth lens E12 and the thirteenth lens E13 are cemented together.

[0111] The basic parameters of lens group 10 in Embodiment 2 are shown in Table 3. The values ​​of D1 and D2 in Table 3 are shown in Table 4.

[0112] Table 3

[0113] Table 4

[0114] like Figure 7 As shown, the optical system described in Embodiment 2 can achieve good imaging quality in the first state. Figure 9 As shown, the optical system given in Embodiment 2 can achieve good imaging quality in the second state.

[0115] Example 3 The following is for reference Figures 10-13The lens assembly 10 according to Embodiment 3 of this application is described. Figure 10 A schematic diagram of the lens assembly 10 in the first state of Embodiment 3 provided in this application is shown. Figure 11 A schematic diagram of the on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical system of Embodiment 3 in the first state is shown. Figure 12 A schematic diagram of the lens assembly 10 in the second state of Embodiment 3 provided in this application is shown. Figure 13 A schematic diagram of the on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical system of Embodiment 3 in the second state is shown.

[0116] Example 3 includes 15 lenses. The effective focal lengths fq (at infinite object distance) and fw (at 1000mm object distance) of the optical system in Example 3 are both effective focal lengths when adapted to an imaging lens with a focal length of 22.48mm. Specific data for fq and fw in Example 3 are shown in the table below.

[0117] like Figure 10 and 12 As shown, the lens group 10 includes a first lens group G1 and a second lens group G2.

[0118] 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 group G1 has positive optical power.

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

[0120] 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.

[0121] 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 convex.

[0122] 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.

[0123] 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.

[0124] 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.

[0125] The second lens group G2 includes the seventh lens E7, the eighth lens E8, the ninth lens E9, the tenth lens E10, the eleventh lens E11, the twelfth lens E12, the thirteenth lens E13, the fourteenth lens E14, and the fifteenth lens E15. The second lens group G2 has positive optical power.

[0126] 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.

[0127] The eighth lens E8 has positive optical power. The object-side surface S13 of the eighth lens E8 is convex, and the image-side surface S14 of the eighth lens E8 is convex.

[0128] The ninth lens E9 has negative optical power. The object-side surface S14 of the ninth lens E9 is concave, and the image-side surface S15 of the ninth lens E9 is concave.

[0129] The tenth lens E10 has negative optical power. The object side S16 of the tenth lens E10 is concave, and the image side S17 of the tenth lens E10 is concave.

[0130] The eleventh lens E11 has positive optical power. The object-side surface S17 of the eleventh lens E11 is convex, and the image-side surface S18 of the eleventh lens E11 is convex.

[0131] The twelfth lens E12 has negative optical power. The object side S19 of the twelfth lens E12 is concave, and the image side S20 of the twelfth lens E12 is concave.

[0132] The thirteenth lens E13 has positive optical power. The object-side surface S20 of the thirteenth lens E13 is convex, and the image-side surface S21 of the thirteenth lens E13 is convex.

[0133] The fourteenth lens E14 has positive optical power. The object side surface S22 of the fourteenth lens E14 is convex, and the image side surface S23 of the fourteenth lens E14 is convex.

[0134] The fifteenth lens E15 has positive optical power. The object-side surface S24 of the fifteenth lens E15 is convex, and the image-side surface S25 of the fifteenth lens E15 is convex.

[0135] 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 eighth lens E8 and the ninth lens E9 are cemented together; the tenth lens E10 and the eleventh lens E11 are cemented together; and the twelfth lens E12 and the thirteenth lens E13 are cemented together.

[0136] The basic parameters of lens group 10 in Embodiment 3 are shown in Table 5. The values ​​of D1 and D2 in Table 5 are shown in Table 6.

[0137] Table 5

[0138] Table 6

[0139] like Figure 11 As shown, the optical system described in Embodiment 3 can achieve good imaging quality in the first state. Figure 13 As shown, the optical system given in Embodiment 3 can achieve good imaging quality in the second state.

[0140] 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 assembly 10 in the first state of Embodiment 4 provided in this application is shown. Figure 15 A schematic diagram of the on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical system of Embodiment 4 in the first state is shown. Figure 16 A schematic diagram of the lens assembly 10 in the second state of Embodiment 4 provided in this application is shown. Figure 17 A schematic diagram of the on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical system of Embodiment 4 in the second state is shown.

[0141] Example 4 includes 15 lenses. The effective focal lengths fq (at infinite object distance) and fw (at 1000mm object distance) of the optical system in Example 4 are both effective focal lengths when adapted to an imaging lens with a focal length of 22.48mm. Specific data for fq and fw in Example 4 are shown in the table below.

[0142] like Figure 14 and 16 As shown, the lens group 10 includes a first lens group G1 and a second lens group G2.

[0143] 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 group G1 has positive optical power.

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

[0145] 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.

[0146] 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 convex.

[0147] 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.

[0148] 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.

[0149] 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.

[0150] The second lens group G2 includes the seventh lens E7, the eighth lens E8, the ninth lens E9, the tenth lens E10, the eleventh lens E11, the twelfth lens E12, the thirteenth lens E13, the fourteenth lens E14, and the fifteenth lens E15. The second lens group G2 has positive optical power.

[0151] 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.

[0152] The eighth lens E8 has positive optical power. The object-side surface S13 of the eighth lens E8 is convex, and the image-side surface S14 of the eighth lens E8 is convex.

[0153] The ninth lens E9 has negative optical power. The object-side surface S14 of the ninth lens E9 is concave, and the image-side surface S15 of the ninth lens E9 is concave.

[0154] The tenth lens E10 has negative optical power. The object side S16 of the tenth lens E10 is concave, and the image side S17 of the tenth lens E10 is concave.

[0155] The eleventh lens E11 has positive optical power. The object-side surface S17 of the eleventh lens E11 is convex, and the image-side surface S18 of the eleventh lens E11 is convex.

[0156] The twelfth lens E12 has negative optical power. The object side S19 of the twelfth lens E12 is concave, and the image side S20 of the twelfth lens E12 is concave.

[0157] The thirteenth lens E13 has positive optical power. The object-side surface S20 of the thirteenth lens E13 is convex, and the image-side surface S21 of the thirteenth lens E13 is convex.

[0158] The fourteenth lens E14 has positive optical power. The object side surface S22 of the fourteenth lens E14 is convex, and the image side surface S23 of the fourteenth lens E14 is convex.

[0159] The fifteenth lens E15 has positive optical power. The object-side surface S24 of the fifteenth lens E15 is convex, and the image-side surface S25 of the fifteenth lens E15 is convex.

[0160] 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 eighth lens E8 and the ninth lens E9 are cemented together; the tenth lens E10 and the eleventh lens E11 are cemented together; and the twelfth lens E12 and the thirteenth lens E13 are cemented together.

[0161] The basic parameters of lens group 10 in Embodiment 4 are shown in Table 7. The values ​​of D1 and D2 in Table 7 are shown in Table 8.

[0162] Table 7

[0163] Table 8

[0164] like Figure 15 As shown, the optical system described in Embodiment 4 achieves good imaging quality in the first state. Figure 17 As shown, the optical system given in Embodiment 4 can achieve good imaging quality in the second state.

[0165] 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 assembly 10 of Embodiment 5 provided in this application in the first state is shown. Figure 19 A schematic diagram of the on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical system of Embodiment 5 in the first state is shown. Figure 20 A schematic diagram of the lens assembly 10 in the second state of Embodiment 5 provided in this application is shown. Figure 21 A schematic diagram of the on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical system of Embodiment 5 in the second state is shown.

[0166] Example 5 includes 15 lenses. The effective focal lengths fq (at infinite object distance) and fw (at 1000mm object distance) of the optical system in Example 5 are both effective focal lengths when adapted to an imaging lens with a focal length of 22.48mm. Specific data for fq and fw in Example 5 are shown in the table below.

[0167] like Figure 18 and 20 As shown, the lens group 10 includes a first lens group G1 and a second lens group G2.

[0168] 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 group G1 has positive optical power.

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

[0170] 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.

[0171] 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.

[0172] 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.

[0173] 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.

[0174] 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.

[0175] The second lens group G2 includes the seventh lens E7, the eighth lens E8, the ninth lens E9, the tenth lens E10, the eleventh lens E11, the twelfth lens E12, the thirteenth lens E13, the fourteenth lens E14, and the fifteenth lens E15. The second lens group G2 has positive optical power.

[0176] 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.

[0177] The eighth lens E8 has positive optical power. The object-side surface S13 of the eighth lens E8 is convex, and the image-side surface S14 of the eighth lens E8 is convex.

[0178] The ninth lens E9 has negative optical power. The object-side surface S14 of the ninth lens E9 is concave, and the image-side surface S15 of the ninth lens E9 is concave.

[0179] The tenth lens E10 has negative optical power. The object side S16 of the tenth lens E10 is concave, and the image side S17 of the tenth lens E10 is concave.

[0180] The eleventh lens E11 has positive optical power. The object-side surface S17 of the eleventh lens E11 is convex, and the image-side surface S18 of the eleventh lens E11 is convex.

[0181] The twelfth lens E12 has negative optical power. The object side S19 of the twelfth lens E12 is concave, and the image side S20 of the twelfth lens E12 is concave.

[0182] The thirteenth lens E13 has positive optical power. The object-side surface S20 of the thirteenth lens E13 is convex, and the image-side surface S21 of the thirteenth lens E13 is convex.

[0183] The fourteenth lens E14 has positive optical power. The object side surface S22 of the fourteenth lens E14 is convex, and the image side surface S23 of the fourteenth lens E14 is convex.

[0184] The fifteenth lens E15 has positive optical power. The object-side surface S24 of the fifteenth lens E15 is convex, and the image-side surface S25 of the fifteenth lens E15 is concave.

[0185] 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 eighth lens E8 and the ninth lens E9 are cemented together; the tenth lens E10 and the eleventh lens E11 are cemented together; and the twelfth lens E12 and the thirteenth lens E13 are cemented together.

[0186] The basic parameters of lens group 10 in Embodiment 5 are shown in Table 9. The values ​​of D1 and D2 in Table 9 are shown in Table 10.

[0187] Table 9

[0188] Table 10

[0189] like Figure 19 As shown, the optical system described in Embodiment 5 achieves good imaging quality in the first state. Figure 21 As shown, the optical system given in Embodiment 5 can achieve good imaging quality in the second state.

[0190] 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 assembly 10 of Embodiment Six provided in this application in its first state is shown. Figure 23 A schematic diagram of the on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical system of Embodiment Six in the first state is shown. Figure 24 A schematic diagram of the lens assembly 10 in the second state of Embodiment Six provided in this application is shown. Figure 25 A schematic diagram of the on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical system of Embodiment Six in the second state is shown.

[0191] Example 6 includes 15 lenses. The effective focal lengths fq (at infinite object distance) and fw (at 1000mm object distance) of the optical system in Example 6 are both effective focal lengths when adapted to an imaging lens with a focal length of 22.48mm. Specific data for fq and fw in Example 6 are shown in the table below.

[0192] like Figure 22 and 24 As shown, the lens group 10 includes a first lens group G1 and a second lens group G2.

[0193] 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 group G1 has positive optical power.

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

[0195] The second lens E2 has 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.

[0196] 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 convex.

[0197] 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.

[0198] 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.

[0199] 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.

[0200] The second lens group G2 includes the seventh lens E7, the eighth lens E8, the ninth lens E9, the tenth lens E10, the eleventh lens E11, the twelfth lens E12, the thirteenth lens E13, the fourteenth lens E14, and the fifteenth lens E15. The second lens group G2 has positive optical power.

[0201] 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.

[0202] The eighth lens E8 has positive optical power. The object-side surface S13 of the eighth lens E8 is convex, and the image-side surface S14 of the eighth lens E8 is convex.

[0203] The ninth lens E9 has negative optical power. The object-side surface S14 of the ninth lens E9 is concave, and the image-side surface S15 of the ninth lens E9 is concave.

[0204] The tenth lens E10 has negative optical power. The object side S16 of the tenth lens E10 is concave, and the image side S17 of the tenth lens E10 is concave.

[0205] The eleventh lens E11 has positive optical power. The object-side surface S17 of the eleventh lens E11 is convex, and the image-side surface S18 of the eleventh lens E11 is convex.

[0206] The twelfth lens E12 has negative optical power. The object side S19 of the twelfth lens E12 is concave, and the image side S20 of the twelfth lens E12 is concave.

[0207] The thirteenth lens E13 has positive optical power. The object-side surface S20 of the thirteenth lens E13 is convex, and the image-side surface S21 of the thirteenth lens E13 is convex.

[0208] The fourteenth lens E14 has positive optical power. The object side surface S22 of the fourteenth lens E14 is convex, and the image side surface S23 of the fourteenth lens E14 is convex.

[0209] The fifteenth lens E15 has positive optical power. The object-side surface S24 of the fifteenth lens E15 is convex, and the image-side surface S25 of the fifteenth lens E15 is convex.

[0210] 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 eighth lens E8 and the ninth lens E9 are cemented together; the tenth lens E10 and the eleventh lens E11 are cemented together; and the twelfth lens E12 and the thirteenth lens E13 are cemented together.

[0211] The basic parameters of lens group 10 in Embodiment Six are shown in Table 11. The values ​​of D1 and D2 in Table 11 are shown in Table 12.

[0212] Table 11

[0213] Table 12

[0214] like Figure 23 As shown, the optical system described in Embodiment Six achieves good imaging quality in the first state. Figure 25 As shown, the optical system given in Embodiment Six can achieve good imaging quality in the second state.

[0215] Example 7 The following is for reference Figures 26-29The lens assembly 10 according to Embodiment 7 of this application is described. Figure 26 A schematic diagram of the lens assembly 10 of Embodiment 7 provided in this application in its first state is shown. Figure 27 A schematic diagram of the on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical system of Embodiment 7 in the first state is shown. Figure 28 A schematic diagram of the lens assembly 10 of Embodiment 7 provided in this application in the second state is shown. Figure 29 A schematic diagram of the on-axis chromatic aberration curve, astigmatism curve, and distortion curve of the optical system of Embodiment 7 in the second state is shown.

[0216] Example 7 includes 15 lenses. The effective focal lengths fq (at infinite object distance) and fw (at 1000mm object distance) of the optical system in Example 7 are both effective focal lengths when adapted to an imaging lens with a focal length of 22.48mm. The specific data for fq and fw in Example 7 are shown in the table below.

[0217] like Figure 26 and 28 As shown, the lens group 10 includes a first lens group G1 and a second lens group G2.

[0218] 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 group G1 has positive optical power.

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

[0220] The second lens E2 has 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.

[0221] 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 convex.

[0222] 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.

[0223] 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.

[0224] 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.

[0225] The second lens group G2 includes the seventh lens E7, the eighth lens E8, the ninth lens E9, the tenth lens E10, the eleventh lens E11, the twelfth lens E12, the thirteenth lens E13, the fourteenth lens E14, and the fifteenth lens E15. The second lens group G2 has positive optical power.

[0226] 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.

[0227] The eighth lens E8 has positive optical power. The object-side surface S13 of the eighth lens E8 is convex, and the image-side surface S14 of the eighth lens E8 is concave.

[0228] The ninth lens E9 has negative optical power. The object-side surface S14 of the ninth lens E9 is convex, and the image-side surface S15 of the ninth lens E9 is concave.

[0229] The tenth lens E10 has negative optical power. The object side S16 of the tenth lens E10 is concave, and the image side S17 of the tenth lens E10 is concave.

[0230] The eleventh lens E11 has positive optical power. The object-side surface S17 of the eleventh lens E11 is convex, and the image-side surface S18 of the eleventh lens E11 is convex.

[0231] The twelfth lens E12 has negative optical power. The object side S19 of the twelfth lens E12 is concave, and the image side S20 of the twelfth lens E12 is concave.

[0232] The thirteenth lens E13 has positive optical power. The object-side surface S20 of the thirteenth lens E13 is convex, and the image-side surface S21 of the thirteenth lens E13 is convex.

[0233] The fourteenth lens E14 has positive optical power. The object side surface S22 of the fourteenth lens E14 is convex, and the image side surface S23 of the fourteenth lens E14 is convex.

[0234] The fifteenth lens E15 has positive optical power. The object-side surface S24 of the fifteenth lens E15 is convex, and the image-side surface S25 of the fifteenth lens E15 is convex.

[0235] 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 eighth lens E8 and the ninth lens E9 are cemented together; the tenth lens E10 and the eleventh lens E11 are cemented together; and the twelfth lens E12 and the thirteenth lens E13 are cemented together.

[0236] The basic parameters of lens group 10 in Embodiment 7 are shown in Table 13. The values ​​of D1 and D2 in Table 13 are shown in Table 14.

[0237] Table 13

[0238] Table 14

[0239] like Figure 27 As shown, the optical system described in Embodiment 7 can achieve good imaging quality in the first state. Figure 29 As shown, the optical system given in Embodiment 7 can achieve good imaging quality in the second state.

[0240] 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.

[0241] Table 15

[0242] Table 16

[0243] In addition, this application also provides an optical system including a lens group provided in any embodiment of this application.

[0244] 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.

[0245] 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, comprising a first lens group and a second lens group sequentially from the object side to the image side along the optical axis, characterized in that, The first lens group has positive optical power and consists of the following lenses: A first lens with positive optical power; The second lens with positive optical power has convex surfaces on both its object side and image side. A third lens with negative optical power has a concave object side. The fourth lens with positive optical power has convex surfaces on both its object side and image side. The fifth lens with negative optical power has concave object-side and image-side surfaces; The sixth lens has positive optical power and its image-side surface is convex. The second lens group has positive optical power and consists of the following lenses: The seventh lens with positive optical power has a convex object side and a concave image side. The eighth lens, which has positive optical power, has a convex object-side surface; The ninth lens, which has negative optical power, has a concave image-side surface. The tenth lens with negative optical power has concave object and image sides. The eleventh lens, which has positive optical power, has a convex object-side surface. The twelfth lens, which has negative optical power, has concave object-side and image-side surfaces; The thirteenth lens with positive optical power has convex surfaces on both its object side and image side. The fourteenth lens, which has positive optical power, has convex surfaces on both its object side and image side. The fifteenth lens, which has positive optical power, has a convex object-side surface. 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 first lens group can move along the optical axis to achieve zoom; and satisfies: 1.85 < LG2 / FG2 < 2.45; 16.50 < FG1 / ΔL < 19.90; Wherein, LG2 is the axial distance from the object side of the seventh lens to the image side of the fifteenth lens, FG2 is the combined focal length of the second lens group, FG1 is the combined focal length of the first lens group, and ΔL is the distance the first lens group moves along the optical axis when the lens group changes from an infinite object distance state to a 1000mm object distance state.

2. The lens assembly according to claim 1, characterized in that, The lens group satisfies: 2.50 < f11 / (CT10+CT11) < 4.60, where f11 is the effective focal length of the eleventh lens, CT10 is the center thickness of the tenth lens, and CT11 is the center thickness of the eleventh lens.

3. The lens assembly according to claim 1, characterized in that, The lens group satisfies: -11.85 < F45 / T56 < -7.20, where F45 is the combined focal length of the fourth and fifth lenses, and T56 is the air gap between the fifth and sixth lenses on the optical axis.

4. The lens assembly according to claim 1, characterized in that, The lens group satisfies: 2.20 < F123 / ∑CTG1 ≤ 3.35, where F123 is the combined focal length of the first lens, the second lens, and the third lens, and ∑CTG1 is the sum of the center thicknesses of all lenses from the first lens to the sixth lens.

5. The lens assembly according to claim 1, characterized in that, The lens group satisfies: 1.50 < ∑CTG2 / F1415 < 2.20, where ∑CTG2 is the sum of the center thicknesses of all lenses from the seventh lens to the fifteenth lens, and F1415 is the combined focal length of the fourteenth lens and the fifteenth lens.

6. The lens assembly according to claim 1, characterized in that, The lens group satisfies: 1.15 < f6 / LG1 < 1.55, where f6 is the effective focal length of the sixth lens and LG1 is the on-axis distance from the object side of the first lens to the image side of the sixth lens.

7. The lens assembly according to claim 1, characterized in that, The lens group satisfies: -5.40 < F89 / (R15+R18) < -2.05, where F89 is the combined focal length of the eighth lens and the ninth lens, R15 is the radius of curvature of the object side of the eighth lens, and R18 is the radius of curvature of the image side of the ninth lens.

8. The lens assembly according to claim 1, characterized in that, The lens group satisfies: 1.75 < f8 / T78 < 3.30, where f8 is the effective focal length of the eighth 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: -9.40 < R12 / CT6 < -5.70, where R12 is the radius of curvature of the image side of the sixth lens, and CT6 is the center thickness of the sixth lens.

10. The lens assembly according to claim 1, characterized in that, The lens group satisfies: 1.65 < (f15 × N15) / (f14 × N14) < 2.00, where f15 is the effective focal length of the fifteenth lens, N15 is the refractive index of the fifteenth lens, f14 is the effective focal length of the fourteenth lens, and N14 is the refractive index of the fourteenth lens.

11. The lens assembly according to claim 1, characterized in that, The lens group satisfies: 3.80 < (CT8 + CT9) / CT7 < 6.40, where CT8 is the center thickness of the eighth lens, CT9 is the center thickness of the ninth lens, and CT7 is the center thickness of the seventh lens.

12. The lens assembly according to claim 1, characterized in that, The lens group satisfies: 10.25≤LG1 / ΔL<12.90, where LG1 is the on-axis distance from the object side of the first lens to the image side of the sixth lens.

13. The lens assembly according to claim 1, characterized in that, The lens group satisfies: 1.15 < (CT12 + CT13) / (f12 + f13) < 1.90, where CT12 is the center thickness of the twelfth lens, CT13 is the center thickness of the thirteenth lens, f12 is the effective focal length of the twelfth lens, and f13 is the effective focal length of the thirteenth lens.

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

15. The optical system according to claim 14, characterized in that, The optical system also includes an imaging lens and an imaging surface located on the image side of the 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.

16. The optical system according to claim 15, characterized in that, The optical system satisfies: -2.10 < fw / ∑CTG1 < -1.35, where fw is the effective focal length of the optical system at an object distance of 1000 mm, and ∑CTG1 is the sum of the center thicknesses of all lenses from the first lens to the sixth lens.

17. The optical system according to claim 15, characterized in that, The optical system satisfies: 1.65 < Δf / ΔL < 2.15, where Δf is the change in effective focal length of the optical system when the object distance changes from infinite to 1000 mm.

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

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