Optical system

Abstract

The invention relates to an optical system, which comprises a reflecting element and a lens barrel with an accommodating space, an imaging lens group and a plurality of spacing elements are arranged in the accommodating space of the lens barrel, and the imaging lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens; the plurality of spacing elements at least comprise a second spacing element which is positioned on the image side of the second lens and is at least partially contacted with the image side surface of the second lens; the fifth spacing element is positioned on the image side of the fifth lens and is at least partially contacted with the image side surface of the fifth lens; the optical system satisfies the following conditions: 16.17 < = f5 / CT5 < = 23.71; -3.25 < = R10 * N5 / d5s < =-2.77; wherein f5 is the effective focal length of the fifth lens, CT5 is the center thickness of the fifth lens, N5 is the refractive index of the fifth lens, R10 is the curvature radius of the image side surface of the fifth lens, and d5s is the inner diameter of the object side surface of the fifth spacing element. According to the optical system, large image plane, large aperture and high performance are realized, and the requirements of imaging quality, miniaturization and light weight of the optical system are met.

Description

Technical Field

[0001] This invention relates to the field of imaging lens technology, and more particularly to an optical system. Background Technology

[0002] In recent years, periscope telephoto lenses have significantly improved the space utilization of mobile devices through prism refraction light path design. The application of power prisms to periscope telephoto lenses has further solved the pain points of insufficient light intake and bulky size of traditional periscope lenses.

[0003] Currently, periscope telephoto lenses still face constraints from key issues such as coma, chromatic aberration, and field curvature. These issues directly lead to a decline in the image quality of the optical system, making it difficult to meet the demands for high-resolution and high-fidelity imaging. From the perspective of lens optical characteristics, lenses have a regulating effect on incident light. When the optical focal length of the lens is too large, the incident angle of light at the lens edge is large, resulting in greater coma and field curvature at the edge of the field of view, reducing the resolution of the optical system, and also leading to reduced edge illumination. Conversely, if the optical focal length of the lens is too small, the optical system will not adequately correct chromatic aberration, resulting in purple or red fringing. In addition, it will increase the lens length, which does not meet the requirements for miniaturization. Furthermore, in lens design, high refractive index materials and aspherical lenses are used to further optimize spherical aberration, chromatic aberration, and field curvature. However, high refractive index materials and aspherical lenses tend to lead to high lens sensitivity, affecting lens cost and easily generating stray light.

[0004] Therefore, how to solve the aberrations of periscope telephoto lenses, reduce lens stray light, and reduce lens costs have become urgent problems to be solved. Summary of the Invention

[0005] To address the problems existing in the prior art, the present invention aims to provide an optical system that solves problems such as coma, chromatic aberration, field curvature, and stray light in periscope telephoto lenses, improves lens imaging quality, and reduces lens sensitivity to reduce costs.

[0006] To achieve the above-mentioned objective, the present invention provides an optical system comprising a reflective element and a lens barrel having a receiving space. The reflective element is disposed on the object side of the lens barrel, and the receiving space of the lens barrel contains an imaging lens group and a plurality of spacer elements.

[0007] The imaging lens group includes, in sequence along the optical axis from the object side to the image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, totaling six lenses with optical power;

[0008] The plurality of spacers includes at least a second spacer located on the image side of the second lens and in at least partial contact with the image side surface of the second lens, and a fifth spacer located on the image side of the fifth lens and in at least partial contact with the image side surface of the fifth lens;

[0009] The optical system satisfies:

[0010] 16.17≤f5 / CT5≤23.71;

[0011] -3.25≤R10*N5 / d5s≤-2.77;

[0012] Wherein, f5 is the effective focal length of the fifth lens, CT5 is the center thickness of the fifth lens, N5 is the refractive index of the fifth lens, R10 is the radius of curvature of the image side of the fifth lens, and d5s is the inner diameter of the object side of the fifth spacer element.

[0013] According to one technical solution of the present invention, the plurality of spacer elements further includes a first spacer element located on the image side of the first lens and in at least partial contact with the image side side of the first lens;

[0014] The optical system satisfies: 2.02≤EP12 / (CT2+T12)≤2.90;

[0015] Wherein, EP12 is the distance between the first spacer element and the second spacer element along the optical axis, CT2 is the center thickness of the second lens, and T12 is the air gap between the first lens and the second lens along the optical axis.

[0016] According to one technical solution of the present invention, the optical system satisfies: -21.50≤R2*d1s / (CT1*R1)≤-8.66;

[0017] Wherein, CT1 is the center thickness of the first lens, R1 is the radius of curvature of the object side of the first lens, R2 is the radius of curvature of the image side of the first lens, and d1s is the inner diameter of the object side of the first spacer element.

[0018] According to one technical solution of the present invention, the optical system satisfies: 1.49≤(CT1+EP01) / (D1s-d1s)≤1.76;

[0019] Wherein, d1s is the inner diameter of the object side surface of the first spacer element, D1s is the outer diameter of the object side surface of the first spacer element, EP01 is the distance between the object side end face of the lens barrel and the first spacer element along the optical axis, and CT1 is the center thickness of the first lens.

[0020] According to one technical solution of the present invention, the optical system satisfies: -14.64≤R3 / D1m≤-3.21;

[0021] Wherein, D1m is the outer diameter of the image side of the first spacer element, and R3 is the radius of curvature of the object side of the second lens.

[0022] According to one technical solution of the present invention, the plurality of spacer elements further includes a third spacer element located on the image side of the third lens and in at least partial contact with the image side surface of the third lens;

[0023] The optical system satisfies: 4.94≤R6 / R5≤5.94; 4.53≤R6 / d3s≤6.18;

[0024] Wherein, R5 is the radius of curvature of the object side of the third lens, R6 is the radius of curvature of the image side of the third lens, and d3s is the inner diameter of the object side of the third spacer element.

[0025] According to one technical solution of the present invention, the optical system satisfies: 7.65≤f3 / EP23≤11.69;

[0026] Where f3 is the effective focal length of the third lens, and EP23 is the distance between the second spacer element and the third spacer element along the optical axis.

[0027] According to one technical solution of the present invention, the plurality of spacer elements further includes a fourth spacer element located on the image side of the fourth lens and in at least partial contact with the image side surface of the fourth lens;

[0028] The optical system satisfies: -11.57≤R7 / f4≤-3.44; 1.28≤R8 / d4s≤2.18;

[0029] Wherein, f4 is the effective focal length of the fourth lens, R7 is the radius of curvature of the object side of the fourth lens, R8 is the radius of curvature of the image side of the fourth lens, and d4s is the inner diameter of the object side of the fourth spacer element.

[0030] According to one technical solution of the present invention, the plurality of spacer elements further includes a fifth spacer element located on the image side of the fifth lens and in at least partial contact with the image side surface of the fifth lens;

[0031] The optical system satisfies: 1.47≤(EP34+EP45) / (CT4+CT5)≤2.02;

[0032] Wherein, EP34 is the distance between the third spacer element and the fourth spacer element along the optical axis, EP45 is the distance between the fourth spacer element and the fifth spacer element along the optical axis, CT4 is the center thickness of the fourth lens, and CT5 is the center thickness of the fifth lens.

[0033] According to one technical solution of the present invention, the optical system satisfies: -1.57≤f² / R⁴≤-1.39; -1.99≤f² / (D²m-d²m)≤-1.72;

[0034] Wherein, R4 is the radius of curvature of the image-side surface of the second lens, f2 is the effective focal length of the second lens, D2m is the outer diameter of the image-side surface of the second spacer element, and d2m is the inner diameter of the image-side surface of the second spacer element.

[0035] According to one technical solution of the present invention, the reflective element satisfies: 106.47mm≤FG≤114.81mm;

[0036] Where FG is the focal length of the reflective element.

[0037] The beneficial effects of this invention are:

[0038] The optical system provided by this invention includes a reflective element and a lens barrel with a housing space. The housing space of the lens barrel houses six lenses with optical power and spacers between the lenses. This achieves good correction of optical aberrations while also intercepting stray light during imaging, ensuring the overall image quality of the system. By rationally allocating the lens center thickness and optical power, a balance is struck between image quality and mass production cost, while also meeting the lightweight design requirements of the optical system. Furthermore, to correct chromatic aberration, the fifth lens uses a high-refractive-index material, which is highly sensitive and prone to generating internal reflection stray light. By controlling the ratio of the product of the image-side radius of curvature and the refractive index of the fifth lens to the object-side inner diameter of the fifth spacer within a reasonable range, sensitivity can be reduced, stray light can be effectively controlled, and edge image quality can be improved, thereby enhancing image quality. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0040] Figure 1 A structural layout diagram and schematic diagram of some parameters of an optical system according to the present invention are shown;

[0041] Figure 2A and Figure 2B The structural layout diagrams of the optical system when the lens in the imaging lens group is a non-clipped lens and the optical system when the lens in the imaging lens group is a clipped lens are shown respectively according to the present invention;

[0042] Figure 3A and Figure 3B The following are schematic diagrams showing the structure of an optical system according to the present invention, where the reflecting elements are a prism G and a thick lens P respectively;

[0043] Figure 4A and Figure 4B Schematic diagrams of two optical systems according to Embodiment 1 of this application are shown;

[0044] Figure 5A , Figure 5B , Figure 5C , Figure 5D and Figure 5E The following diagrams show the structure of the optical system according to Embodiment 1 of this application at an infinite object distance, along with its on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve.

[0045] Figure 6A , Figure 6B , Figure 6C , Figure 6D and Figure 6E The following diagrams show the structure of the optical system according to Embodiment 1 of this application at an object distance of 300mm, along with its on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve.

[0046] Figure 7A and Figure 7B Schematic diagrams of two optical systems according to Embodiment 2 of this application are shown;

[0047] Figure 8A , Figure 8B , Figure 8C , Figure 8D and Figure 8E The following diagrams show the structure of the optical system according to Embodiment 2 of this application at an infinite object distance, along with its on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve.

[0048] Figure 9A , Figure 9B , Figure 9C , Figure 9D and Figure 9E The following diagrams show the structure of the optical system according to Embodiment 2 of this application at an object distance of 300 mm, the on-axis chromatic aberration curve, the astigmatism curve, the distortion curve, and the magnification chromatic aberration curve.

[0049] Figure 10A and Figure 10B Schematic diagrams of two optical systems according to Embodiment 3 of this application are shown;

[0050] Figure 11A , Figure 11B , Figure 11C , Figure 11D and Figure 11E The following diagrams show the structure of the optical system according to Embodiment 3 of this application at an infinite object distance, along with its on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve.

[0051] Figure 12A , Figure 12B , Figure 12C , Figure 12D and Figure 12E The following diagrams show the structure of the optical system according to Embodiment 3 of this application at an object distance of 300 mm, the on-axis chromatic aberration curve, the astigmatism curve, the distortion curve, and the magnification chromatic aberration curve.

[0052] Figure 13A and Figure 13B Schematic diagrams of two optical systems according to Embodiment 4 of this application are shown;

[0053] Figure 14A , Figure 14B , Figure 14C , Figure 14D and Figure 14E The following diagrams show the structure of the optical system according to Embodiment 4 of this application at an infinite object distance, along with its on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve.

[0054] Figure 15A , Figure 15B , Figure 15C , Figure 15D and Figure 15E The following diagrams show the structure of the optical system according to Embodiment 4 of this application at an object distance of 300 mm, the on-axis chromatic aberration curve, the astigmatism curve, the distortion curve, and the magnification chromatic aberration curve.

[0055] Figure 16A and Figure 16B Schematic diagrams of two optical systems according to Embodiment 5 of this application are shown;

[0056] Figure 17A , Figure 17B , Figure 17C , Figure 17D and Figure 17E The following diagrams show the structure of the optical system according to Embodiment 5 of this application at an infinite object distance, along with its on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve.

[0057] Figure 18A , Figure 18B , Figure 18C , Figure 18D and Figure 18E The following diagrams show the structure of the optical system according to Embodiment 5 of this application at an object distance of 300 mm, the on-axis chromatic aberration curve, the astigmatism curve, the distortion curve, and the magnification chromatic aberration curve.

[0058] Figure 19 A schematic diagram of the MTF performance of the optical system is shown when f5 / CT5 = 19.52;

[0059] Figure 20 A schematic diagram of the MTF performance of the optical system when f5 / CT5 = 15.21 is shown.

[0060] Figure 21 A schematic diagram of the MTF performance of the optical system when f5 / CT5 = 24.84 is shown.

[0061] Figure 22A and Figure 22B The diagram shows the spot pattern and relative illuminance when the optical system satisfies R10*N5 / d5s=-2.16;

[0062] Figure 23A and Figure 23B The diagram shows the spot pattern and relative illuminance when the optical system satisfies R10*N5 / d5s=-4.56;

[0063] Figure 24A and Figure 24B The diagram shows the spot pattern and relative illuminance when the optical system satisfies R10*N5 / d5s=-1.56. Detailed Implementation

[0064] 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.

[0065] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the third lens, or the first lens may also be referred to as the first lens.

[0066] 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.

[0067] 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. The surface shape in the paraxial region can be determined by the sign of the R value (R refers to the radius of curvature of the paraxial region). In this paper, with the lens as the boundary, the side where the scene to be imaged is located is the object side, and the side where the image of the scene to be imaged is located is the image side. The surface of each lens near the object side is called the object-side surface of the lens, and the surface of each lens near the image side is called the image-side surface of the lens. Each object-side or image-side surface of a lens has an optical region and a structural region. The optical region refers to the light-transmitting region, and the structural region refers to the assembly region. For the object-side surface, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; for the image-side surface, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

[0068] 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.

[0069] 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 the 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.

[0070] It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other. The following embodiments only illustrate several implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be pointed out that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of this application, and these all fall within the protection scope of this application.

[0071] like Figures 1 to 3B As shown, in one aspect of the invention, the optical system of the invention includes a reflective element, a lens barrel, an imaging lens group, and a plurality of spacer elements.

[0072] The imaging lens group comprises six lenses, which are arranged sequentially from the object side to the image side along the optical axis as follows: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. Each lens is independent of the others, and there is an air gap between each lens on the optical axis.

[0073] The plurality of spacer elements includes at least the first to the fifth spacer elements;

[0074] The imaging lens group and multiple spacer elements are housed within the lens barrel, which includes an object-side end face, an image-side end face, an outer ring surface, and an inner ring surface. Along the optical axis of the optical system, the inner ring surface of the lens barrel is stepped.

[0075] In some embodiments of the present invention, the first lens has positive optical power, the second lens has negative optical power, the third lens has positive optical power, the fourth lens has negative optical power, the fifth lens has positive optical power, and the sixth lens has negative optical power. This helps to balance system aberrations, meet the characteristics of high resolution, and thus achieve better imaging results. Specifically, the object-side and image-side surfaces of the first lens are both convex; the object-side and image-side surfaces of the second lens are both concave; the object-side surface of the third lens is convex and the image-side surface is concave; the object-side surface of the fourth lens is convex and the image-side surface is concave; the object-side surface of the fifth lens is concave and the image-side surface is convex; and the object-side surface of the sixth lens is convex and the image-side surface is concave.

[0076] In some embodiments of the present invention, the optical system may also include color filters and / or protective glass.

[0077] In some embodiments of the present invention, the optical system satisfies: 16.17≤f5 / CT5≤23.71; -3.25≤R10*N5 / d5s≤-2.77; where f5 is the effective focal length of the fifth lens, CT5 is the center thickness of the fifth lens, N5 is the refractive index of the fifth lens, R10 is the radius of curvature of the image side of the fifth lens, and d5s is the inner diameter of the object side of the fifth spacer element.

[0078] The lens barrel in the optical system of this application is used to house six lenses with optical power, as well as a housing space for multiple spacer elements between the lenses, and can accommodate the imaging lens group and multiple spacer elements in the optical system.

[0079] To address system aberrations while maintaining a lightweight design, the ratio of the effective focal length to the center thickness of the fifth lens is reasonably limited to 16.17 ≤ f5 / CT5 ≤ 23.71. This achieves a relative balance between image quality and mass production costs. If this value is too large, it means the lens's optical focal length is too small or the lens is too thin. If the optical focal length is too small, the light refraction capability is insufficient, limiting the ability to correct chromatic aberration and making it difficult to effectively participate in system-level aberration balancing. If the lens is too thin, it is difficult to form, increasing lens manufacturing costs. If the ratio is too small, the optical focal length is too strong or the lens is too thick. If the optical focal length is too strong, the incident angle of edge rays is too large, making coma difficult to control and reducing external field illumination, resulting in decreased edge image quality. If the lens is too thick, the amount of material used increases, violating the lightweight design principle.

[0080] To correct chromatic aberration, the fifth lens is made of a material with a high refractive index, which makes it more sensitive and prone to producing stray light. By reasonably controlling the ratio of the product of the radius of curvature of the image side of the fifth lens and the refractive index of the fifth lens to the inner diameter of the object side of the fifth spacer element, such that it satisfies -3.25≤R10*N5 / d5s≤-2.77, the sensitivity of the fifth lens can be reduced, stray light and ghosting can be reasonably controlled, the risk of stray light can be reduced, and the edge image quality can be improved, thus improving the overall image quality.

[0081] In addition, please refer to Table 1 below and Figures 19 to 21 ,like Figure 19 As shown, Figure 19 This diagram illustrates the MTF performance of an optical system when f5 / CT5 = 19.52. When the optical system satisfies f5 / CT5 = 19.52, it meets the above range, indicating good MTF performance. Figure 20 As shown, Figure 20 This diagram illustrates the MTF performance of an optical system when f5 / CT5 = 15.21. When f5 / CT5 = 15.21, the MTF performance exceeds the lower limit of the range, indicating poor MTF performance at the edge of the field of view. Figure 21 As shown, Figure 21 The diagram illustrates the MTF performance of the optical system when f5 / CT5 = 24.84. When f5 / CT5 = 24.84, the MTF performance exceeds the upper limit, resulting in poor MTF performance in both the inner and outer fields of view. Therefore, this application addresses the system aberration problem and achieves aberration balance by constraining 16.17 ≤ f5 / CT5 ≤ 23.71.

[0082] Within range Exceeding the lower limit of the range Exceeding the upper limit of the range Conditional expression f5 / CT5 = 19.52 f5 / CT5 = 15.21 f5 / CT5 = 24.84 Supporting evidence Figure 19 Figure 20 Figure 21

[0083] Table 1

[0084] Refer to Table 2 below and Figures 22A to 24B ,like Figure 22A and Figure 22B As shown, Figure 22A and Figure 22B The diagram shows the light spot pattern and relative illumination when the optical system satisfies R10*N5 / d5s=-2.16. When the optical system satisfies R10*N5 / d5s=-2.16, it meets the above range, and the relative illumination of the optical system is good. Figure 23A and Figure 23B As shown, Figure 23A and Figure 23B The diagram shows the light spot pattern and relative illumination when the optical system satisfies R10*N5 / d5s = -4.56. When the optical system satisfies R10*N5 / d5s = -4.56, it exceeds the lower limit of the range, resulting in poor relative illumination at the edge of the optical system's field of view. For example... Figure 24A and Figure 24B As shown, Figure 24A and Figure 24B The diagram shows the light spot and relative illuminance when the optical system satisfies R10*N5 / d5s = -1.56. When the optical system satisfies R10*N5 / d5s = -1.56, it exceeds the upper limit of the range, resulting in poor stray light performance. Therefore, this application achieves a balance between stray light performance and relative illuminance by constraining -3.25 ≤ R10*N5 / d5s ≤ -2.77.

[0085] Within range Exceeding the lower limit of the range Exceeding the upper limit of the range Conditional expression R10*N5 / d5s=-2.16 R10*N5 / d5s=-4.56 R10*N5 / d5s=-1.56 Supporting evidence Figure 22A and Figure 22B Figure 23A and Figure 23B Figure 24A and Figure 24B

[0086] Table 2

[0087] In some embodiments of the present invention, the optical system satisfies: 2.02≤EP12 / (CT2+T12)≤2.90; where EP12 is the distance between the first spacer element and the second spacer element along the optical axis, CT2 is the center thickness of the second lens, and T12 is the air gap between the first lens and the second lens on the optical axis.

[0088] The conditional EP12 / (CT2+T12) is a mechanical-optical coordinated control of the front lens group in an optical system. Constraining it within a reasonable range balances optical performance, mechanical structural stability, stray light suppression, and manufacturability. If this value is too large, it means that the width between the first and second spacers is relatively large, while the center thickness of the second lens is relatively small. This results in a higher overall mechanical bending degree and a larger surface curvature of the lens, making lens forming more difficult and demanding on manufacturing processes, further increasing costs. Furthermore, it greatly increases the possibility of multiple reflections of light on the inner wall of the lens barrel or the lens edge, forming glare or stray light, which severely degrades image contrast and quality. If this value is too small, insufficient physical clearance of the lens may occur, potentially leading to contact between curved lens surfaces, pushing tolerance limits to their limits, and causing mechanical interference or collisions. This results in stringent assembly tolerance requirements, low yield, and problems such as thermal expansion.

[0089] In some embodiments of the present invention, the optical system satisfies: -21.50≤R2*d1s / (CT1*R1)≤-8.66; where CT1 is the center thickness of the first lens, R1 is the radius of curvature of the object side of the first lens, R2 is the radius of curvature of the image side of the first lens, and d1s is the inner diameter of the object side of the first spacer element.

[0090] The core purpose of controlling R2*d1s / (CT1*R1) within a reasonable range is to ensure sufficient physical clearance between the image-side surface of the first lens and the first spacer element to avoid mechanical interference, while ensuring that the light-passing aperture is not blocked, and taking into account the manufacturability and structural stability of the lens. If this ratio is too large, it means that the inner diameter of the first spacer element is too large relative to the thickness of the first lens, the inner wall of the first spacer element is too far from the optical axis, it cannot effectively constrain the edge position of the image-side surface of the first lens, lacks sufficient mechanical support, and more importantly, it may allow more stray light from the lens edge or the inner wall of the lens barrel to enter the subsequent optical path, affecting performance. On the other hand, if the ratio is too small, it means that the inner wall of the first spacer element is too close to the principal ray, and will directly touch or be very close to the edge area of ​​the image-side surface of the first lens, which may directly block the principal ray in severe cases, affecting imaging.

[0091] In some embodiments of the present invention, the optical system satisfies 1.49≤(CT1+EP01) / (D1s-d1s)≤1.76; where d1s is the inner diameter of the object side surface of the first spacer element, D1s is the outer diameter of the object side surface of the first spacer element, EP01 is the distance between the object side end face of the lens barrel and the first spacer element along the optical axis, and CT1 is the center thickness of the first lens.

[0092] The core purpose of controlling the ratio (CT1+EP01) / (D1s-d1s) within a reasonable range is to ensure that the first spacer element has sufficient structural rigidity and stability to reliably support the first lens and prevent it from tilting, shifting, or experiencing stress concentration during assembly or use, while also avoiding excessive space occupation by the first spacer element. An excessively large ratio means that the axial stacking height (CT1+EP01) is much greater than the equivalent thickness (D1s-d1s) of the first spacer element. Insufficient rigidity of the first spacer element makes it prone to bending deformation. Deformation of the first spacer element directly leads to tilting and eccentricity of the first lens it supports, severely compromising the coaxiality of the optical system and causing a decrease in image quality. An excessively small ratio means that the spacer element is very thick and bulky, while its axial support height is relatively small. This results in the spacer element occupying excessive radial space, forcing an increase in the lens barrel diameter and the overall system size, which is detrimental to miniaturization design.

[0093] In some embodiments of the present invention, the optical system satisfies: 4.94≤R6 / R5≤5.94; 4.53≤R6 / d3s≤6.18; where R5 is the radius of curvature of the object side of the third lens, R6 is the radius of curvature of the image side of the third lens, and d3s is the inner diameter of the object side of the third spacer element P3 between the third lens and the fourth lens and in direct contact with the image side of the third lens.

[0094] Maintaining the ratio of the image-side radius of curvature to the object-side radius of curvature of the third lens within a reasonable range is crucial for balancing optical performance and manufacturability. This ratio directly affects the shape, power distribution, aberration contribution, and manufacturing yield of the third lens. An excessively large ratio means the object-side of the third lens is highly curved, while the image-side is nearly flat. In this case, the power is concentrated on the object-side, making off-axis aberration correction difficult, causing the actual focal length to deviate from the design value, affecting system integration, and potentially leading to an excessively large center thickness (CT) to maintain the edge thickness of the third lens, increasing material costs and weight. Conversely, an excessively small ratio results in a nearly flat object-side while the image-side is highly curved, making the third lens resemble a plano-convex or plano-concave lens. The power is concentrated on the curved image-side, making spherical aberration correction difficult. Furthermore, controlling the ratio of the image-side radius of curvature of the third lens to the inner diameter of the object-side of the third spacer element within a reasonable range ensures a safe physical gap between the edge of the third lens and the inner wall of the third spacer element, preventing mechanical interference, optical vignetting, or stray light, while maintaining structural stability and manufacturability.

[0095] In some embodiments of the present invention, the optical system satisfies: 7.65≤f3 / EP23≤11.69; where f3 is the effective focal length of the third lens and EP23 is the spacing between the second and third spacers along the optical axis.

[0096] The core objective of controlling the f3 / EP23 value within a reasonable range is to balance optical performance with system compactness. This ratio directly reflects the proportion of lens edge thickness to the system focal length; a ratio that is too large or too small will lead to drastically different failure modes. If the ratio is too small, light will be significantly deflected in long air gaps, making off-axis aberration correction difficult; light rays in a wide field of view will propagate asymmetrically within the gap, exacerbating distortion, and the light will be reflected multiple times within the long lens barrel, significantly increasing the risk of ghosting and stray light. If the ratio is too large, the edge and convex surface of the third lens will collide with adjacent lenses or spacer elements, resulting in edge chipping or stress cracks; the sag of the curved surfaces of adjacent lenses will overlap, and the effective light-passing aperture will be blocked, causing vignetting.

[0097] In some embodiments of the present invention, the optical system satisfies: 1.47≤(EP34+EP45) / (CT4+CT5)≤2.02; where EP34 is the distance between the third and fourth spacers along the optical axis, EP45 is the distance between the fourth and fifth spacers along the optical axis, CT4 is the center thickness of the fourth lens, and CT5 is the center thickness of the fifth lens.

[0098] By properly controlling the value of (EP34+EP45) / (CT4+CT5), a balance between axial structural stiffness and thermal stability can be achieved, preventing lens misalignment caused by mechanical deformation or thermal stress. An excessively large value indicates that the thickness of the lens structure is much greater than the center thickness of the lens's effective diameter, potentially resulting in a double-concave shape. This shape, on the one hand, leads to stress concentration in the thinner central area due to the large difference between the center thickness and edge thickness, resulting in insufficient mechanical strength and susceptibility to breakage during processing and assembly. On the other hand, maintaining the lower limit of the center thickness requires increasing the radius of curvature, but the contradictory factor of the thicker edge thickness causes compression between adjacent lenses, resulting in vignetting. Conversely, an excessively small value results in the center thickness far exceeding the lens edge thickness. The small gap between the lens centers can cause interference during assembly. Furthermore, the slope angle at the lens edge increases, which is detrimental to lens forming, leading to a significant difference between the surface shape and the theoretical value, further deteriorating the forming capability.

[0099] In some embodiments of the present invention, the optical system satisfies: -11.57≤R7 / f4≤-3.44; 1.28≤R8 / d4s≤2.18; where f4 is the effective focal length of the fourth lens, R7 is the radius of curvature of the object side of the fourth lens, R8 is the radius of curvature of the image side of the fourth lens, and d4s is the inner diameter of the object side of the fourth spacer element.

[0100] By controlling the ratio of the radius of curvature of the object side of the fourth lens to its effective focal length within a reasonable range, aberration correction, optical power distribution, and manufacturability can be balanced. This ratio directly determines the lens shape and optical characteristics of the fourth lens. When this ratio is too small, the object side of the fourth lens is highly curved, causing light to be severely deflected on the highly curved surface, resulting in focal separation between peripheral and paraxial rays and blurring of the central field of view. Simultaneously, when the central thickness of the fourth lens is limited, its edge thickness may be too small, leading to edge chipping during processing or thermal stress cracking. When this ratio is too large, the object side of the fourth lens is close to a plane. Planar or near-planar surfaces are extremely sensitive to installation tilt, and lens tilt has a significant impact on astigmatism, increasing assembly difficulty. Excessive reliance on the image side of the fourth lens for optical power leads to a loss of freedom in aberration correction. Further controlling the ratio of the radius of curvature of the image side of the fourth lens to the inner diameter of the object side of the fourth spacer element aims to ensure a safe physical gap between the edge of the fourth lens and the inner wall of the fourth spacer element, avoiding mechanical interference, optical vignetting, or stray light. If this ratio is too small, the radius of curvature of the fourth lens's image side will be too small, or the inner diameter of the fourth spacer element's object side will be too large. This can lead to edge chipping or plastic deformation during installation, significantly impacting imaging capabilities. Additionally, an excessively large inner diameter of the fourth spacer element's image side may prevent it from effectively blocking stray light from inside the lens. If this ratio is too large, the fourth lens's image side will be nearly flat, or the inner diameter of the fourth spacer element's object side will be too small. This excessive inward taper of the fourth lens's edge will increase lens coma, and may also allow stray light generated by the spacer element itself to easily enter the imaging system.

[0101] In some embodiments of the present invention, the optical system satisfies: -14.64≤R3 / D1m≤-3.21; where D1m is the outer diameter of the image side of the first spacer element and R3 is the radius of curvature of the object side of the second lens.

[0102] Maintaining the ratio of the radius of curvature of the object-side surface of the second lens to the outer diameter of the image-side surface of the first spacer element within a reasonable range ensures radial spatial matching between the curved surface of the second lens object-side surface and the inner wall of the lens barrel, avoiding mechanical interference, tilt instability, or stray light. This ratio directly affects the positioning accuracy of the second lens and the reliability of the system. If the absolute value of this ratio is too small, it will result in a high degree of curvature of the object-side surface of the second lens or an excessively large outer diameter of the first spacer element, which is detrimental to lens sensitivity and increases costs. If the absolute value of this ratio is too large, the near-plane surface of the object-side surface of the second lens or the outer diameter of the first spacer element will be too small, resulting in insufficient chromatic aberration correction of the system and affecting image quality.

[0103] In some embodiments of the present invention, the optical system satisfies: -1.57≤f2 / R4≤-1.39; -1.99≤f2 / (D2m-d2m)≤-1.73; where R4 is the radius of curvature of the image-side surface of the second lens, f2 is the effective focal length of the second lens, D2m is the outer diameter of the image-side surface of the second spacer element, and d2m is the inner diameter of the image-side surface of the second spacer element.

[0104] Controlling the ratio of the effective focal length of the second lens to the radius of curvature of its image-side surface can balance lens performance, manufacturability, and stability. An excessively high value will result in a highly curved image-side surface of the second lens, causing light to be incident and refracted at very large angles, easily introducing higher-order spherical aberrations, coma, etc. These aberrations significantly reduce image quality, especially in large-aperture systems where the degradation is further exacerbated. For manufacturing, this also presents challenges such as processing difficulties, low yield, high cost, and fragility due to the thin center. Furthermore, because the lens is sensitive to eccentricity, even small deviations can lead to a drastic drop in image quality, resulting in poor system stability. An excessively low value will result in a very flat image-side surface of the second lens, almost planar. While an extremely flat surface itself introduces fewer aberrations, to achieve the required effective focal length, the other surface of the second lens may need to be highly curved, or the center thickness of the second lens may need to be very large, which can also introduce significant aberrations, especially field curvature. By further controlling the value of f2 / (D2m-d2m)—the ratio of the effective focal length of the second lens to the difference between the inner and outer diameters of the image side of the second spacer element—within a reasonable range, the stray light control, structural stability, and assemblability of the lens can be effectively improved.

[0105] In some embodiments of the present invention, the reflective element satisfies: 106.47mm≤FG≤114.81mm; where FG is the focal length of the reflective element.

[0106] By controlling this condition, the overall length of the optical system can be shortened by using reflective elements while still meeting the performance requirements of the telephoto lens. This reduces the space required for the lens within the module and helps to meet the requirements for both module size and overall size.

[0107] In another aspect of this application, an optical system according to an exemplary embodiment of the present invention includes a reflecting element, a lens barrel having a receiving space, an imaging lens group, and a plurality of spacer elements. The imaging lens group and the plurality of spacer elements are disposed within the receiving space. The imaging lens group includes six lenses, sequentially arranged along the optical axis from the object side to the image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, wherein each lens is independent of the others, and each lens has an air gap along the optical axis. The plurality of spacer elements includes at least the first to fifth spacer elements. The first lens has positive optical power, the second lens has negative optical power, the third lens has positive optical power, the fourth lens has negative optical power, the fifth lens has positive optical power, and the sixth lens has negative optical power.

[0108] The optical system satisfies: -11.57≤R7 / f4≤-3.44; 1.28≤R8 / d4s≤2.18; where f4 is the effective focal length of the fourth lens, R7 is the radius of curvature of the object side of the fourth lens, R8 is the radius of curvature of the image side of the fourth lens, and d4s is the inner diameter of the object side of the fourth spacer element.

[0109] By rationally controlling the ratio of the object-side surface curvature radius of the fourth lens to the effective focal length of the fourth lens, the aberration correction effect of the fourth lens can be optimized and the image quality improved, while balancing the manufacturability of the optical system. By rationally controlling the relationship between the image-side surface curvature radius of the fourth lens and the object-side surface inner diameter of the fourth spacer element, the light beam emitted from the fourth lens can be constrained, avoiding vignetting or stray light introduction caused by the fourth spacer element blocking the beam, thereby improving image contrast and ultimately enhancing lens performance.

[0110] The optical system according to the above embodiments of this application can employ multiple lenses, such as the six lenses mentioned above. By rationally allocating the optical power, surface shape, and arrangement of the spacers of each lens, the range of each lens-tube engagement is made more uniform, enhancing the light-gathering ability and improving the imaging quality of the optical system.

[0111] In some embodiments of the present invention, the lens material in the optical system provided by the present invention can be glass or plastic. When the lens material is plastic, production costs can be effectively reduced. Conversely, when the lens material is glass, the low dispersion characteristic of glass itself can effectively correct the geometric chromatic aberration of the optical system. The optical lens provided by the present invention can adopt an all-plastic lens structure, which not only gives the lens excellent imaging performance but also allows for a more compact lens structure, achieving a good balance between lens miniaturization and high image quality.

[0112] In some embodiments of the present invention, the first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens can be spherical lenses or aspherical lenses. Compared with spherical structures, aspherical structures can effectively reduce the aberrations of the optical system, thereby reducing the number of lenses and the size of the lenses, and better achieving lens miniaturization. More specifically, the first lens, second lens, third lens, fourth lens, fifth lens, and sixth lens of the present invention can all be aspherical lenses, which can effectively reduce the aberrations of the optical lens, thereby reducing the number of lenses and the size of the lenses, and achieving lens miniaturization.

[0113] When an aspherical lens is used, the shapes of each aspherical surface of the optical lens satisfy the following equation:

[0114]

[0115] In the above formula, z is the axial distance from the vertex to the surface at a position perpendicular to the optical axis at a height y; c represents the curvature at the vertex of the aspherical surface; k is the conic coefficient; A4, A6, A8, A 10 A 12 A 14 A 16 ...represent aspheric coefficients of the fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth orders, respectively.

[0116] The present invention will be further described below with reference to several embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens are different; for specific differences, please refer to the parameter tables of each embodiment. The following embodiments are merely preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present invention should be considered equivalent substitutions and are included within the protection scope of the present invention.

[0117] It should be noted that when the subject moves relative to the imaging lens group from infinity to macro, or when the subject moves relative to the imaging lens group from macro to infinity, the imaging lens group moves along the optical axis to achieve focusing; when the subject moves closer to or away from the lens group, the motor drives the lens group to move and change the distance between the imaging lens group and the reflecting element to achieve automatic focusing.

[0118] It should be noted that the reflecting element can be a prism G with optical power, which can be equivalent to a thick lens P with optical power in the design. In the following embodiments, the reflecting element is presented as a thick lens P with optical power.

[0119] Example 1

[0120] The following is for reference Figures 4A to 6E The optical system 1001 and optical system 1002 according to Embodiment 1 of this application are described. Figure 4A and Figure 4B Schematic diagrams of optical system 1001 and optical system 1002 according to Embodiment 1 of this application are shown respectively.

[0121] like Figure 4A , Figure 4B and Figure 5A As shown, the structural schematic diagrams of optical system 1001 and optical system 1002 both include a reflective element, a lens barrel P0, an imaging lens group E1 to E6, and multiple spacer elements P1 to P5.

[0122] In Embodiment 1, the schematic diagrams of optical systems 1001 and 1002 use the same imaging lens group. The imaging lens group, from the object side to the image side, includes: a first lens E1 with positive optical power, a second lens E2 with negative optical power, a third lens E3 with positive optical power, a fourth lens E4 with negative optical power, a fifth lens E5 with positive optical power, and a sixth lens E6 with negative optical power. Specifically, the object side S3 and image side S4 of the first lens E1 are both convex; the object side S5 and image side S6 of the second lens E2 are both concave; the object side S7 of the third lens E3 is convex, and its image side S8 is concave; the object side S9 of the fourth lens E4 is convex, and its image side S10 is concave; the object side S11 of the fifth lens E5 is concave, and its image side S12 is convex; and the object side S13 of the sixth lens E6 is convex, and its image side S14 is concave. The object-side surface S1 of the reflecting element P is the incident surface of the reflecting element P, and this incident surface is convex; the image-side surface S2 of the reflecting element P is the exit surface of the reflecting element P, and this exit surface is concave. The reflecting element and the aperture are positioned in front of the first lens E1. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged on the imaging surface S17. Among them, surfaces S15 and S16 can be the object-side surface and image-side surface of the filter or protective glass E7, surface S17 is the imaging surface, OBJ (not shown in the figure) is the object surface, and STO is the aperture.

[0123] Table 3-1 lists the relevant parameters of each lens in the optical system of this embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, Abbe number and conic coefficient. Table 3-2 lists the variable spacing values ​​between each lens group in the optical system of this embodiment from an object distance of infinity to an object distance of 300 mm. The units of radius of curvature and thickness are millimeters (mm).

[0124]

[0125]

[0126] Table 3-1 D1 endless 300mm D2 4.1070 2.5364 D3 5.7178 7.3884

[0127] Table 3-2

[0128] Table 4 lists the aspherical coefficients of each aspherical lens in the optical system of this embodiment, including: A4, A6, A8, A... 10 A 12 A 14 A 16 A 18 A 20 .

[0129]

[0130]

[0131] Table 4

[0132] like Figure 4A and Figure 4B As shown, both optical systems 1001 and 1002 include five spacer elements, namely, first spacer element P1, ..., fourth spacer element P4 and fifth spacer element P5. Specifically, first spacer element P1 is disposed between first lens E1 and second lens E2 and contacts the image-side surface of first lens E1; second spacer element P2 is disposed between second lens E2 and third lens E3 and contacts the image-side surface of second lens E2; third spacer element P3 is disposed between third lens E3 and fourth lens E4 and contacts the image-side surface of third lens E3; fourth spacer element P4 is disposed between fourth lens E4 and fifth lens E5 and contacts the image-side surface of fourth lens E4; and fifth spacer element P5 is disposed between fifth lens E5 and sixth lens E6 and contacts the image-side surface of fifth lens E5. These spacer elements P1 to P5 can block excess external light from entering, allowing for better contact between the lenses and the lens barrel, and enhancing the structural stability of optical systems 1001 and 1002.

[0133] The differences between optical systems 1001 and 1002 may lie in the size of the spacer element, the non-effective diameter region of the lens, and the lens barrel structural parameters. Table 5 shows the basic parameters of the spacer element and lens barrel of optical systems 1001 and 1002 in Embodiment 1. As an example, both optical systems 1001 and 1002 have a lens barrel P0.

[0134] Example 1 Parameters Optical System 1001 Optical System 1002 EP01(mm) 1.8906 1.8906 EP12(mm) 1.7200 1.7830 EP23(mm) 1.0000 1.0260 EP34(mm) 2.1430 1.5720 EP45(mm) 1.5170 1.3430 d1s(mm) 5.8140 5.8140 D1s(mm) 8.3000 8.2790 D1m(mm) 8.3000 8.2790 d2m(mm) 4.9230 4.9230 D2m(mm) 8.2140 8.1720 d3s(mm) 4.7490 6.2230 d4s(mm) 4.8170 4.8460 d5s(mm) 5.5410 5.5410

[0135] Table 5

[0136] Figure 5AA schematic diagram of the optical system of Embodiment 1 is shown when the object distance is infinite. Figure 5B The on-axis chromatic aberration curve of the optical system of Embodiment 1 at an infinite object distance is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 5C The astigmatism curves of the optical system of Embodiment 1 at an infinite object distance are shown, representing the meridional image plane curvature and the sagittal image plane curvature. Figure 5D The distortion curve of the optical system of Embodiment 1 at an infinite object distance is shown, which represents the distortion magnitude corresponding to different image heights. Figure 5E The magnification chromatic aberration curve of the optical system of Embodiment 1 at an infinite object distance is shown, which represents the deviation of different image heights on the imaging plane after the light passes through the lens. Figure 6A A schematic diagram of the optical system of Embodiment 1 is shown at an object distance of 300 mm. Figure 6B The on-axis chromatic aberration curve of the optical system of Embodiment 1 at an object distance of 300 mm is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 6C The astigmatism curves of the optical system of Embodiment 1 at an object distance of 300 mm are shown, representing the meridional image plane curvature and the sagittal image plane curvature. Figure 6D The distortion curve of the optical system of Embodiment 1 at an object distance of 300 mm is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 6E The magnification chromatic aberration curve of the optical system of Embodiment 1 at an object distance of 300 mm is shown, representing the deviation of different image heights on the imaging plane after light passes through the lens. According to... Figures 5A to 6E As can be seen, the optical system given in Example 1 can achieve good imaging quality.

[0137] Example 2

[0138] The following is for reference Figures 7A to 5D The optical system 2001 and optical system 2002 according to Embodiment 2 of this application are described. Figure 7A and Figure 7B Schematic diagrams of optical system 2001 and optical system 2002 according to Embodiment 2 of this application are shown respectively.

[0139] like Figure 7A , Figure 7B and Figure 8A As shown, the structural schematic diagrams of optical system 2001 and optical system 2002 both include a lens barrel P0, a reflecting element, an imaging lens group E1 to E6, and multiple spacer elements P1 to P5.

[0140] In Embodiment 2, the schematic diagrams of optical systems 2001 and 2002 use the same imaging lens group. The imaging lens group, from the object side to the image side, includes: a first lens E1 with positive optical power, a second lens E2 with negative optical power, a third lens E3 with positive optical power, a fourth lens E4 with negative optical power, a fifth lens E5 with positive optical power, and a sixth lens E6 with negative optical power. Specifically, the object side S3 and image side S4 of the first lens E1 are both convex; the object side S5 and image side S6 of the second lens E2 are both concave; the object side S7 of the third lens E3 is convex, and its image side S8 is concave; the object side S9 of the fourth lens E4 is convex, and its image side S10 is concave; the object side S11 of the fifth lens E5 is concave, and its image side S12 is convex; and the object side S13 of the sixth lens E6 is convex, and its image side S14 is concave. The object-side surface S1 of the reflecting element P is the incident surface of the reflecting element P, and this incident surface is convex; the image-side surface S2 of the reflecting element P is the exit surface of the reflecting element P, and this exit surface is concave. The reflecting element and the aperture are positioned in front of the first lens E1. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged on the imaging surface S17. Among them, surfaces S15 and S16 can be the object-side surface and image-side surface of the filter or protective glass E7, surface S17 is the imaging surface, OBJ (not shown in the figure) is the object surface, and STO is the aperture.

[0141] Table 6-1 lists the relevant parameters of each lens in the optical system of this embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, Abbe number and conic coefficient. Table 6-2 lists the variable spacing values ​​between each lens group when the object distance of the optical system of this embodiment is from infinity to 300 mm. The units of radius of curvature and thickness are millimeters (mm).

[0142] Surface serial number Surface type radius of curvature thickness Refractive index Abbe number Conic coefficient OBJ spherical endless D1 S1 spherical 13.0668 8.1000 1.518 64.05 S2 spherical 13.4484 D2 STO spherical endless -0.1704 S3 aspherical 5.2000 2.0850 1.546 56.14 0.0000 S4 aspherical -16.0746 0.0583 0.0000 S5 aspherical -27.3129 0.7957 1.619 25.93 0.0000 S6 aspherical 4.0457 0.4232 0.0000 S7 aspherical 5.0496 1.1715 1.591 28.41 0.0000 S8 aspherical 29.9745 1.0376 0.0000 S9 aspherical 207.5379 1.0895 1.619 25.93 0.0000 S10 aspherical 10.5153 1.3236 0.0000 S11 aspherical -49.6098 0.9745 1.677 19.24 0.0000 S12 aspherical -9.4089 0.0939 0.0000 S13 aspherical 9.3856 0.8124 1.537 55.71 0.0000 S14 aspherical 4.8622 D3 0.0000 S15 spherical endless 0.2100 1.518 64.17 S16 spherical endless 0.3900 S17 spherical endless

[0143] Table 6-1

[0144] D1 endless 300mm D2 3.9710 2.3531 D3 5.5458 7.1637

[0145] Table 6-2

[0146] Table 7 lists the aspherical coefficients of each aspherical lens in the optical system of this embodiment, including: A4, A6, A8, A... 10 A 12 A 14 A 16 A 18 A 20 .

[0147] Face number <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 ]]> <![CDATA[A 12 ]]> <![CDATA[A 14 ]]> <![CDATA[A 16 ]]> S3 -3.5940E-04 -5.0073E-05 1.7284E-06 -6.6793E-07 -1.6698E-07 4.6583E-08 -4.2076E-09 S4 7.9325E-03 -8.1283E-03 4.7931E-03 -1.6398E-03 3.4219E-04 -4.4603E-05 3.5591E-06 S5 3.1606E-03 -7.6484E-03 5.1507E-03 -1.8108E-03 3.8297E-04 -5.0601E-05 4.1052E-06 S6 -7.1662E-03 -1.2996E-03 7.8803E-04 -1.0130E-04 -2.6168E-05 1.1683E-05 -1.8054E-06 S7 5.0750E-05 8.7351E-05 -7.4645E-04 3.9741E-04 -1.0968E-04 1.8280E-05 -1.7082E-06 S8 2.4504E-04 2.7258E-03 -1.4917E-03 4.1758E-04 -6.7548E-05 5.4500E-06 1.6787E-07 S9 -1.1436E-02 7.2683E-03 -2.7734E-03 7.9443E-04 -1.7647E-04 3.0948E-05 -4.0199E-06 S10 -1.6607E-02 8.2526E-03 -3.1194E-03 1.0597E-03 -3.0678E-04 6.9744E-05 -1.0909E-05 S11 -7.7643E-03 1.3285E-03 -4.8998E-04 2.0037E-04 -8.6006E-05 2.4781E-05 -4.2277E-06 S12 -2.0258E-03 -4.5082E-03 3.3017E-03 -1.2587E-03 2.8246E-04 -3.8809E-05 3.1776E-06 S13 -1.9707E-02 -5.5352E-03 5.0201E-03 -1.8714E-03 4.2186E-04 -6.1143E-05 5.6495E-06 S14 -2.3799E-02 1.3121E-03 6.3923E-04 -2.7105E-04 5.4215E-05 -6.5123E-06 4.7772E-07 Face number <![CDATA[A 18 ]]> <![CDATA[A 20 ]]> S3 1.2787E-10 0.0000E+00 S4 -1.5965E-07 3.0966E-09 S5 -1.8800E-07 3.7444E-09 S6 1.2590E-07 -3.1049E-09 S7 6.7679E-08 0.0000E+00 S8 -8.1894E-08 5.3713E-09 S9 3.2470E-07 -1.1713E-08 S10 1.0015E-06 -3.9876E-08 S11 3.9360E-07 -1.5320E-08 S12 -1.3805E-07 2.2857E-09 S13 -3.0682E-07 7.4991E-09 S14 -1.9957E-08 3.6926E-10

[0148] Table 7

[0149] like Figure 7A and Figure 7B As shown, both optical systems 2001 and 2002 include five spacer elements, namely the first spacer element P1, ..., the fourth spacer element P4 and the fifth spacer element P5. Since the positions of these five spacer elements are the same as those of the spacer elements in optical systems 1001 and 1002 of Embodiment 1, they will not be described again.

[0150] The differences between optical systems 2001 and 2002 may lie in the size of the spacer element, the non-effective diameter region of the lens, and the lens barrel structural parameters. Table 7 shows the basic parameters of the spacer element and lens barrel of optical systems 2001 and 2002 in Embodiment 2. As an example, both optical systems 2001 and 2002 have a lens barrel P0.

[0151]

[0152]

[0153] Table 8

[0154] Figure 8A A schematic diagram of the optical system of Embodiment 2 is shown when the object distance is infinite. Figure 8B The on-axis chromatic aberration curve of the optical system of Embodiment 2 at an infinite object distance is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 8C The astigmatism curves of the optical system of Embodiment 2 at an infinite object distance are shown, representing the meridional image plane curvature and the sagittal image plane curvature. Figure 8D The distortion curve of the optical system of Embodiment 2 at an infinite object distance is shown, which represents the distortion magnitude corresponding to different image heights. Figure 8E The magnification chromatic aberration curve of the optical system of Embodiment 2 at an infinite object distance is shown, which represents the deviation of different image heights on the imaging plane after the light passes through the lens. Figure 9A A schematic diagram of the optical system of Embodiment 2 is shown at an object distance of 300 mm. Figure 9B The on-axis chromatic aberration curve of the optical system of Embodiment 2 at an object distance of 300 mm is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 9C The astigmatism curves of the optical system of Embodiment 2 at an object distance of 300 mm are shown, representing the meridional image plane curvature and the sagittal image plane curvature. Figure 9D The distortion curve of the optical system of Embodiment 2 at an object distance of 300 mm is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 9EThe magnification chromatic aberration curve of the optical system of Embodiment 2 at an object distance of 300 mm is shown, representing the deviation of different image heights on the imaging plane after light passes through the lens. According to... Figures 8A to 9E It can be seen that the optical system given in Example 2 can achieve good imaging quality.

[0155] Example 3

[0156] The following is for reference Figures 10A to 12D The optical systems 3001 and 3002 according to Embodiment 3 of this application are described. Figure 10A and Figure 10B Schematic diagrams of optical system 3001 and optical system 3002 according to Embodiment 3 of this application are shown respectively.

[0157] like Figure 10A , Figure 10B and Figure 11A As shown, the structural schematic diagrams of optical systems 3001 and 3002 both include a lens barrel P0, a reflecting element, an imaging lens group E1 to E6, and multiple spacer elements P1 to P5.

[0158] In Embodiment 3, the schematic diagrams of optical systems 3001 and 3002 use the same imaging lens group. The imaging lens group includes, from the object side to the image side, the following in sequence: a first lens E1 with positive optical power, a second lens E2 with negative optical power, a third lens E3 with positive optical power, a fourth lens E4 with negative optical power, a fifth lens E5 with positive optical power, and a sixth lens E6 with negative optical power. Specifically, the object side S3 and image side S4 of the first lens E1 are both convex; the object side S5 and image side S6 of the second lens E2 are both concave; the object side S7 of the third lens E3 is convex, and its image side S8 is concave; the object side S9 of the fourth lens E4 is convex, and its image side S10 is concave; the object side S11 of the fifth lens E5 is concave, and its image side S12 is convex; and the object side S13 of the sixth lens E6 is convex, and its image side S14 is concave. The object-side surface S1 of the reflecting element P is the incident surface of the reflecting element P, and this incident surface is convex; the image-side surface S2 of the reflecting element P is the exit surface of the reflecting element P, and this exit surface is concave. The reflecting element and the aperture are positioned in front of the first lens E1. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged on the imaging surface S17. Among them, surfaces S15 and S16 can be the object-side surface and image-side surface of a filter or protective glass, surface S17 is the imaging surface, OBJ (not shown in the figure) is the object surface, and STO is the aperture.

[0159] Table 9-1 lists the relevant parameters of each lens in the optical system of this embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, Abbe number and conic coefficient. Table 9-2 lists the variable spacing values ​​between each lens group in the optical system of this embodiment from an object distance of infinity to an object distance of 300 mm. The units of radius of curvature and thickness are millimeters (mm).

[0160]

[0161]

[0162] Table 9-1

[0163] D1 endless 300mm D2 3.9825 2.3030 D3 5.5740 7.2536

[0164] Table 9-2

[0165] Table 10 lists the aspherical coefficients of each aspherical lens in the optical system of this embodiment, including: A4, A6, A8, A... 10 A 12 A 14 A 16 A 18 A 20 .

[0166] Face number <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 ]]> <![CDATA[A 12 ]]> <![CDATA[A 14 ]]> <![CDATA[A 16 ]]> S3 -3.1855E-04 -6.6913E-05 9.8532E-06 -2.7959E-06 5.0189E-08 4.3639E-08 -5.0535E-09 S4 7.0131E-03 -6.4894E-03 3.7219E-03 -1.2739E-03 2.6728E-04 -3.4931E-05 2.7785E-06 S5 2.7091E-03 -6.6624E-03 4.4474E-03 -1.5634E-03 3.3152E-04 -4.3701E-05 3.4996E-06 S6 -6.8001E-03 -1.7476E-03 1.0053E-03 -1.4198E-04 -3.1020E-05 1.5813E-05 -2.6488E-06 S7 -7.9780E-05 2.8862E-04 -9.8423E-04 5.3000E-04 -1.5161E-04 2.5981E-05 -2.4613E-06 S8 4.7768E-04 2.8845E-03 -1.8011E-03 6.2110E-04 -1.3871E-04 1.9776E-05 -1.4528E-06 S9 -1.1659E-02 7.9116E-03 -3.7680E-03 1.5135E-03 -4.6110E-04 9.7391E-05 -1.3239E-05 S10 -1.6621E-02 8.2391E-03 -3.2202E-03 1.1169E-03 -2.9962E-04 5.8798E-05 -8.0000E-06 S11 -7.2304E-03 9.1467E-04 -4.6849E-04 1.3533E-04 -2.1265E-05 2.6372E-06 -5.4232E-07 S12 -1.8755E-03 -3.5459E-03 1.8850E-03 -6.1833E-04 1.4366E-04 -2.4084E-05 2.7098E-06 S13 -2.0156E-02 -2.5053E-03 1.7650E-03 -2.9098E-04 -1.1740E-05 1.0840E-05 -1.5609E-06 S14 -2.3808E-02 1.9962E-03 4.1872E-05 -2.4797E-05 -4.7524E-06 2.0957E-06 -2.7801E-07 Face number <![CDATA[A 18 ]]> <![CDATA[A 20 ]]> S3 1.6908E-10 0.0000E+00 S4 -1.2337E-07 2.3516E-09 S5 -1.5602E-07 2.9814E-09 S6 2.0104E-07 -5.6068E-09 S7 9.7435E-08 0.0000E+00 S8 1.0825E-08 3.3705E-09 S9 1.0338E-06 -3.5142E-08 S10 6.7175E-07 -2.5620E-08 S11 8.3956E-08 -4.5821E-09 S12 -1.7859E-07 5.1837E-09 S13 9.6334E-08 -2.1996E-09 S14 1.6779E-08 -3.9254E-10

[0167] Table 10

[0168] like Figure 10A and Figure 10B As shown, both optical systems 3001 and 3002 include five spacer elements, namely the first spacer element P1, ..., the fourth spacer element P4 and the fifth spacer element P5. Since the positions of these five spacer elements are the same as those of the spacer elements in optical systems 1001 and 1002 of Embodiment 1, they will not be described again.

[0169] The differences between optical systems 3001 and 3002 may lie in the size of the spacer element, the non-effective diameter region of the lens, and the lens barrel structural parameters. Table 11 shows the basic parameters of the spacer element and lens barrel of optical systems 3001 and 3002 in Embodiment 3. As an example, both optical systems 3001 and 3002 have a lens barrel P0.

[0170] Example 3 Parameters Optical System 3001 Optical System 3002 EP01(mm) 1.9746 1.9746 EP12(mm) 1.8290 1.8890 EP23(mm) 1.0610 1.0400 EP34(mm) 2.3100 2.3200 EP45(mm) 1.5500 0.8820 d1s(mm) 5.8740 6.0150 D1s(mm) 8.4300 8.6430 D1m(mm) 8.4300 8.6430 d2m(mm) 5.0090 4.9960 D2m(mm) 8.3300 8.4620 d3s(mm) 4.8290 4.6930 d4s(mm) 4.8700 6.4170 d5s(mm) 5.6200 5.58800

[0171] Table 11

[0172] Figure 11A A schematic diagram of the optical system of Embodiment 3 is shown when the object distance is infinite. Figure 11BThe on-axis chromatic aberration curve of the optical system of Embodiment 3 at an infinite object distance is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 11C The astigmatism curves of the optical system of Embodiment 3 at an infinite object distance are shown, representing the meridional image plane curvature and the sagittal image plane curvature. Figure 11D The distortion curve of the optical system of Embodiment 3 is shown when the object distance is infinite, which represents the distortion magnitude value corresponding to different image heights. Figure 11E The magnification chromatic aberration curve of the optical system of Embodiment 3 at an infinite object distance is shown, which represents the deviation of different image heights on the imaging plane after the light passes through the lens. Figure 12A A schematic diagram of the optical system of Embodiment 3 is shown at an object distance of 300 mm. Figure 12B The on-axis chromatic aberration curve of the optical system of Embodiment 3 at an object distance of 300 mm is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 12C The astigmatism curves of the optical system of Embodiment 3 at an object distance of 300 mm are shown, representing the meridional image plane curvature and the sagittal image plane curvature. Figure 12D The distortion curve of the optical system of Embodiment 3 at an object distance of 300 mm is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 12E The magnification chromatic aberration curve of the optical system of Embodiment 3 at an object distance of 300 mm is shown, representing the deviation of different image heights on the imaging plane after light passes through the lens. According to... Figures 11A to 12E As can be seen, the optical system given in Example 3 can achieve good imaging quality.

[0173] Example 4

[0174] The following is for reference Figures 13A to 15E The optical systems 4001 and 4002 according to Embodiment 4 of this application are described. Figure 13A and Figure 13B Schematic diagrams of optical system 4001 and optical system 4002 according to Embodiment 4 of this application are shown respectively.

[0175] like Figure 13A , Figure 13B and Figure 14A As shown, the structural schematic diagrams of optical systems 4001 and 4002 both include a lens barrel P0, a reflecting element, an imaging lens group E1 to E6, and multiple spacer elements P1 to P5.

[0176] In Embodiment 4, the schematic diagrams of optical systems 4001 and 4002 use the same imaging lens group. The imaging lens group includes, from the object side to the image side, the following in sequence: a first lens E1 with positive optical power, a second lens E2 with negative optical power, a third lens E3 with positive optical power, a fourth lens E4 with negative optical power, a fifth lens E5 with positive optical power, and a sixth lens E6 with negative optical power. Specifically, the object side S3 and image side S4 of the first lens E1 are both convex; the object side S5 and image side S6 of the second lens E2 are both concave; the object side S7 of the third lens E3 is convex, and its image side S8 is concave; the object side S9 of the fourth lens E4 is convex, and its image side S10 is concave; the object side S11 of the fifth lens E5 is concave, and its image side S12 is convex; and the object side S13 of the sixth lens E6 is convex, and its image side S14 is concave. The object-side surface S1 of the reflecting element P is the incident surface of the reflecting element P, and this incident surface is convex; the image-side surface S2 of the reflecting element P is the exit surface of the reflecting element P, and this exit surface is concave. The reflecting element and the aperture are positioned in front of the first lens E1. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged on the imaging surface S17. Among them, surfaces S15 and S16 can be the object-side surface and image-side surface of the filter or protective glass E7, surface S17 is the imaging surface, OBJ (not shown in the figure) is the object surface, and STO is the aperture.

[0177] Table 12-1 lists the relevant parameters of each lens in the optical system of this embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, Abbe number and conic coefficient. Table 12-2 lists the variable spacing values ​​between each lens group in the optical system of this embodiment from an object distance of infinity to an object distance of 300 mm. The units of radius of curvature and thickness are millimeters (mm).

[0178] Surface serial number Surface type radius of curvature thickness Refractive index Abbe number Conic coefficient OBJ spherical endless D1 S1 spherical 13.4469 8.1000 1.518 64.05 S2 spherical 13.8065 D2 STO spherical endless -0.6071 S3 aspherical 4.7358 2.0000 1.546 56.14 0.0000 S4 aspherical -33.3067 0.0500 0.0000 S5 aspherical -121.9883 0.6241 1.619 25.93 0.0000 S6 aspherical 3.8013 0.8641 0.0000 S7 aspherical 4.8986 1.0975 1.591 28.41 0.0000 S8 aspherical 27.3632 0.9846 0.0000 S9 aspherical 57.2845 0.9043 1.619 25.93 0.0000 S10 aspherical 8.6841 1.5660 0.0000 S11 aspherical -47.7582 0.8500 1.677 19.24 0.0000 S12 aspherical -10.6871 0.1610 0.0000 S13 aspherical 10.5018 0.6000 1.537 55.71 0.0000 S14 aspherical 5.8000 D3 0.0000 S15 spherical endless 0.2100 1.518 64.17 S16 spherical endless 0.3900 S17 spherical endless

[0179] Table 12-1

[0180] D1 endless 300mm D2 4.3837 2.7206 D3 5.9814 7.6445

[0181] Table 12-2

[0182] Table 13 lists the aspherical coefficients of each aspherical lens in the optical system of this embodiment, including: A4, A6, A8, A... 10 A 12 A 14 A 16 A 18 A 20 .

[0183]

[0184]

[0185] Table 13

[0186] like Figure 13A and Figure 13B As shown, both optical systems 4001 and 4002 include five spacer elements, namely the first spacer element P1, ..., the fourth spacer element P4 and the fifth spacer element P5. Since the positions of these five spacer elements are the same as those of the spacer elements in optical systems 1001 and 1002 of Embodiment 1, they will not be described again.

[0187] The differences between optical systems 4001 and 4002 may lie in the size of the spacer element, the non-effective diameter region of the lens, and the lens barrel structural parameters. Table 14 shows the basic parameters of the spacer element and lens barrel of optical systems 4001 and 4002 in Embodiment 4. As an example, both optical systems 4001 and 4002 have a lens barrel P0.

[0188] Example 4 Parameters Optical System 4001 Optical System 4002 EP01(mm) 1.9667 1.9667 EP12(mm) 1.6370 1.9520 EP23(mm) 1.2960 0.9810 EP34(mm) 1.9730 2.0280 EP45(mm) 1.4910 1.5070 d1s(mm) 6.0640 6.1130 D1s(mm) 8.3300 8.3730 D1m(mm) 8.3300 8.3730 d2m(mm) 5.2330 5.1850 D2m(mm) 8.2300 8.2730 d3s(mm) 4.9980 4.8620 d4s(mm) 4.9020 4.9270 d5s(mm) 5.5120 5.5240

[0189] Table 14

[0190] Figure 14A A schematic diagram of the optical system of Embodiment 4 is shown when the object distance is infinite. Figure 14B The image shows the on-axis chromatic aberration curve of the optical system of Embodiment 4 at an infinite object distance, which represents the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 14C The astigmatism curves of the optical system of Embodiment 4 at an infinite object distance are shown, representing the meridional image plane curvature and the sagittal image plane curvature. Figure 14D The distortion curves of the optical system of Embodiment 4 at an infinite object distance are shown, representing the distortion magnitude values ​​corresponding to different image heights. Figure 14E The magnification chromatic aberration curve of the optical system of Embodiment 4 at an infinite object distance is shown, which represents the deviation of different image heights on the imaging plane after the light passes through the lens. Figure 15A A schematic diagram of the optical system of Embodiment 4 is shown at an object distance of 300 mm. Figure 15B The on-axis chromatic aberration curve of the optical system of Embodiment 4 at an object distance of 300 mm is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 15C The astigmatism curves of the optical system of Embodiment 4 at an object distance of 300 mm are shown, representing the meridional image plane curvature and the sagittal image plane curvature. Figure 15D The distortion curve of the optical system of Embodiment 4 at an object distance of 300 mm is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 15EThe magnification chromatic aberration curves of the optical system of Embodiment 4 at an object distance of 300 mm are shown, representing the deviation of different image heights on the imaging plane after light passes through the lens. According to... Figures 14A to 15E As can be seen, the optical system given in Example 4 can achieve good imaging quality.

[0191] Example 5

[0192] The following is for reference Figures 16A to 18E The optical systems 5001 and 5002 according to Embodiment 5 of this application are described. Figure 16A and Figure 16B Schematic diagrams of optical systems 5001 and 5002 according to Embodiment 5 of this application are shown respectively.

[0193] like Figure 16A , Figure 16B and Figure 17A As shown, the structural schematic diagrams of optical systems 5001 and 5002 both include a lens barrel P0, a reflecting element, an imaging lens group E1 to E6, and multiple spacer elements P1 to P5.

[0194] In Embodiment 5, the schematic diagrams of optical systems 5001 and 5002 use the same imaging lens group. The imaging lens group includes, from the object side to the image side, the following in sequence: a first lens E1 with positive optical power, a second lens E2 with negative optical power, a third lens E3 with positive optical power, a fourth lens E4 with negative optical power, a fifth lens E5 with positive optical power, and a sixth lens E6 with negative optical power. Specifically, the object side S3 and image side S4 of the first lens E1 are both convex; the object side S5 and image side S6 of the second lens E2 are both concave; the object side S7 of the third lens E3 is convex, and its image side S8 is concave; the object side S9 of the fourth lens E4 is convex, and its image side S10 is concave; the object side S11 of the fifth lens E5 is concave, and its image side S12 is convex; and the object side S13 of the sixth lens E6 is convex, and its image side S14 is concave. The object-side surface S1 of the reflecting element P is the incident surface of the reflecting element P, and this incident surface is convex; the image-side surface S2 of the reflecting element P is the exit surface of the reflecting element P, and this exit surface is concave. The reflecting element and the aperture are positioned in front of the first lens E1. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged on the imaging surface S17. Among them, surfaces S15 and S16 can be the object-side surface and image-side surface of the filter or protective glass E7, surface S17 is the imaging surface, OBJ (not shown in the figure) is the object surface, and STO is the aperture.

[0195] Table 15-1 lists the relevant parameters of each lens in the optical system of this embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, Abbe number and conic coefficient. Table 15-2 lists the variable spacing values ​​between each lens group in the optical system of this embodiment from an object distance of infinity to an object distance of 300 mm. The units of radius of curvature and thickness are millimeters (mm).

[0196] Surface serial number Surface type radius of curvature thickness Refractive index Abbe number Conic coefficient OBJ spherical endless D1 S1 spherical 13.2203 8.4078 1.518 64.05 S2 spherical 13.4829 D2 STO spherical endless -0.3436 S3 aspherical 4.7795 2.0017 1.546 56.14 0.0000 S4 aspherical -26.3140 0.0903 0.0000 S5 aspherical -80.8165 0.6300 1.619 25.93 0.0000 S6 aspherical 3.9039 0.5522 0.0000 S7 aspherical 5.2789 1.1000 1.591 28.41 0.0000 S8 aspherical 28.1129 1.1066 0.0000 S9 aspherical 120.5455 0.9476 1.619 25.93 0.0000 S10 aspherical 8.5939 1.5500 0.0000 S11 aspherical -49.9882 0.9491 1.677 19.24 0.0000 S12 aspherical -9.3951 0.1232 0.0000 S13 aspherical 10.4103 0.6169 1.537 55.71 0.0000 S14 aspherical 5.8000 D3 0.0000 S15 spherical endless 0.2100 1.518 64.17 S16 spherical endless 0.3900 S17 spherical endless

[0197] Table 15-1

[0198] D1 endless 300mm D2 4.1248 2.3922 D3 5.8931 7.6257

[0199] Table 15-2

[0200] Table 16 lists the aspherical coefficients of each aspherical lens in the optical system of this embodiment, including: A4, A6, A8, A... 10 A 12 A 14 A 16 A 18 A 20 .

[0201] Face number <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 ]]> <![CDATA[A 12 ]]> <![CDATA[A 14 ]]> <![CDATA[A 16 ]]> S3 -4.9786E-04 -6.6298E-05 3.1069E-05 -1.3330E-05 2.7240E-06 -3.2424E-07 2.0603E-08 S4 5.6213E-03 -5.0610E-03 2.7257E-03 -8.1462E-04 1.4049E-04 -1.4142E-05 7.8663E-07 S5 1.3552E-03 -5.0220E-03 3.1886E-03 -9.8040E-04 1.7234E-04 -1.7817E-05 1.0347E-06 S6 -6.9320E-03 -1.1747E-03 5.4962E-04 5.6104E-05 -8.4577E-05 2.4840E-05 -3.5869E-06 S7 4.4651E-05 8.5483E-05 -7.0282E-04 3.6610E-04 -9.8308E-05 1.5834E-05 -1.4223E-06 S8 6.5818E-04 2.4658E-03 -1.6568E-03 6.2391E-04 -1.4988E-04 2.3053E-05 -2.0587E-06 S9 -1.1816E-02 8.3456E-03 -3.8742E-03 1.4834E-03 -4.3101E-04 8.7091E-05 -1.1418E-05 S10 -1.6168E-02 8.3808E-03 -3.3412E-03 1.1499E-03 -3.1124E-04 6.1743E-05 -8.3904E-06 S11 -7.5432E-03 7.4031E-04 -2.5141E-04 8.9404E-05 -3.3165E-05 9.0337E-06 -1.5673E-06 S12 -2.3831E-03 -3.7989E-03 2.4445E-03 -8.6342E-04 1.9074E-04 -2.7758E-05 2.6384E-06 S13 -2.0063E-02 -4.7456E-03 4.1286E-03 -1.4036E-03 2.8650E-04 -3.7424E-05 3.0897E-06 S14 -2.3478E-02 6.1600E-04 1.1822E-03 -4.8583E-04 1.0658E-04 -1.4537E-05 1.2259E-06 Face number <![CDATA[A 18 ]]> <![CDATA[A 20 ]]> S3 -5.3939E-10 0.0000E+00 S4 -2.0094E-08 1.0790E-10 S5 -2.9056E-08 2.4473E-10 S6 2.5975E-07 -7.4408E-09 S7 5.3999E-08 0.0000E+00 S8 7.9970E-08 2.2268E-11 S9 8.6791E-07 -2.8903E-08 S10 6.9424E-07 -2.5877E-08 S11 1.5412E-07 -6.2112E-09 S12 -1.5094E-07 4.0556E-09 S13 -1.4851E-07 3.2044E-09 S14 -5.8496E-08 1.2051E-09

[0202] Table 16

[0203] like Figure 16A and Figure 16B As shown, both optical systems 5001 and 5002 include five spacer elements, namely the first spacer element P1, ..., the fourth spacer element P4 and the fifth spacer element P5. Since the positions of these five spacer elements are the same as those of the spacer elements in optical systems 1001 and 1002 of Embodiment 1, they will not be described again.

[0204] The differences between optical systems 5001 and 5002 may lie in the size of the spacer element, the non-effective diameter region of the lens, and the lens barrel structural parameters. Table 17 shows the basic parameters of the spacer element and lens barrel of optical systems 5001 and 5002 in Embodiment 5. As an example, both optical systems 5001 and 5002 have a lens barrel P0.

[0205]

[0206]

[0207] Table 17

[0208] Figure 17A A schematic diagram of the optical system of Embodiment 5 is shown when the object distance is infinite. Figure 17B The image shows the on-axis chromatic aberration curve of the optical system of Embodiment 5 at an infinite object distance, which represents the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 17C The astigmatism curves of the optical system of Embodiment 5 at an infinite object distance are shown, representing the meridional image plane curvature and the sagittal image plane curvature. Figure 17D The distortion curves of the optical system of Embodiment 5 at an infinite object distance are shown, representing the distortion magnitude values ​​corresponding to different image heights. Figure 17E The magnification chromatic aberration curve of the optical system of Embodiment 5 at an object distance of infinity is shown, which represents the deviation of different image heights on the imaging plane after the light passes through the lens. Figure 18A A schematic diagram of the optical system of Embodiment 5 is shown at an object distance of 300 mm. Figure 18B The on-axis chromatic aberration curve of the optical system of Embodiment 5 at an object distance of 300 mm is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 18C The astigmatism curves of the optical system of Embodiment 5 at an object distance of 300 mm are shown, representing the meridional image plane curvature and the sagittal image plane curvature. Figure 18D The distortion curve of the optical system of Embodiment 5 at an object distance of 300 mm is shown, which represents the distortion magnitude value corresponding to different image heights. Figure 18E The magnification chromatic aberration curves of the optical system of Embodiment 5 at an object distance of 300 mm are shown, representing the deviation of different image heights on the imaging plane after light passes through the lens. According to... Figures 17A to 18E As can be seen, the optical system given in Example 5 can achieve good imaging quality.

[0209] In summary, the optical parameters of the optical systems 1001, 1002, 2001, 2002, 3001, 3002, 4001, 4002, 5001 and 5002 of Embodiments 1 to 5 are shown in Table 18 below.

[0210]

[0211]

[0212] Table 18

[0213] The optical systems 1001, 1002, 2001, 2002, 3001, 3002, 4001, 4002, 5001 and 5002 of Examples 1 to 5 satisfy the relationships shown in Table 19.

[0214]

[0215] Table 19

[0216] 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 the invention 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 inventive concept. 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. An optical system comprising a reflective element and a lens barrel having a receiving space, characterized in that, The reflective element is disposed on the object side of the lens barrel, and the receiving space of the lens barrel is provided with an imaging lens group and multiple spacer elements. The imaging lens group includes, in sequence along the optical axis from the object side to the image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens, totaling six lenses with optical power; The plurality of spacers includes at least a second spacer located on the image side of the second lens and in at least partial contact with the image side surface of the second lens, and a fifth spacer located on the image side of the fifth lens and in at least partial contact with the image side surface of the fifth lens; The optical system satisfies: 16.17≤f5 / CT5≤23.71; -3.25≤R10*N5 / d5s≤-2.77; Wherein, f5 is the effective focal length of the fifth lens, CT5 is the center thickness of the fifth lens, N5 is the refractive index of the fifth lens, R10 is the radius of curvature of the image side of the fifth lens, and d5s is the inner diameter of the object side of the fifth spacer element.

2. The optical system according to claim 1, characterized in that, The plurality of spacer elements further includes a first spacer element located on the image side of the first lens and in at least partial contact with the image side of the first lens; The optical system satisfies: 2.02≤EP12 / (CT2+T12)≤2.90; Wherein, EP12 is the distance between the first spacer element and the second spacer element along the optical axis, CT2 is the center thickness of the second lens, and T12 is the air gap between the first lens and the second lens along the optical axis.

3. The optical system according to claim 2, characterized in that, The optical system satisfies: -21.50≤R2*d1s / (CT1*R1)≤-8.66; Wherein, CT1 is the center thickness of the first lens, R1 is the radius of curvature of the object side of the first lens, R2 is the radius of curvature of the image side of the first lens, and d1s is the inner diameter of the object side of the first spacer element.

4. The optical system according to claim 2, characterized in that, The optical system satisfies: 1.49≤(CT1+EP01) / (D1s-d1s)≤1.76; Wherein, d1s is the inner diameter of the object side surface of the first spacer element, D1s is the outer diameter of the object side surface of the first spacer element, EP01 is the distance between the object side end face of the lens barrel and the first spacer element along the optical axis, and CT1 is the center thickness of the first lens.

5. The optical system according to claim 2, characterized in that, The optical system satisfies: -14.64 ≤ R3 / D1m ≤ -3.21; Wherein, D1m is the outer diameter of the image side of the first spacer element, and R3 is the radius of curvature of the object side of the second lens.

6. The optical system according to claim 1, characterized in that, The plurality of spacer elements also includes a third spacer element located on the image side of the third lens and in at least partial contact with the image side surface of the third lens; The optical system satisfies: 4.94≤R6 / R5≤5.94; 4.53≤R6 / d3s≤6.18; Wherein, R5 is the radius of curvature of the object side of the third lens, R6 is the radius of curvature of the image side of the third lens, and d3s is the inner diameter of the object side of the third spacer element.

7. The optical system according to claim 6, characterized in that, The optical system satisfies: 7.65 ≤ f3 / EP23 ≤ 11.69; Where f3 is the effective focal length of the third lens, and EP23 is the distance between the second spacer element and the third spacer element along the optical axis.

8. The optical system according to claim 6, characterized in that, The plurality of spacer elements further includes a fourth spacer element located on the image side of the fourth lens and in at least partial contact with the image side surface of the fourth lens; The optical system satisfies: -11.57≤R7 / f4≤-3.44; 1.28≤R8 / d4s≤2.18; Wherein, f4 is the effective focal length of the fourth lens, R7 is the radius of curvature of the object side of the fourth lens, R8 is the radius of curvature of the image side of the fourth lens, and d4s is the inner diameter of the object side of the fourth spacer element.

9. The optical system according to claim 8, characterized in that, The plurality of spacer elements also includes a fifth spacer element located on the image side of the fifth lens and in at least partial contact with the image side surface of the fifth lens; The optical system satisfies: 1.47≤(EP34+EP45) / (CT4+CT5)≤2.02; Wherein, EP34 is the distance between the third spacer element and the fourth spacer element along the optical axis, EP45 is the distance between the fourth spacer element and the fifth spacer element along the optical axis, CT4 is the center thickness of the fourth lens, and CT5 is the center thickness of the fifth lens.

10. The optical system according to any one of claims 1-9, characterized in that, The optical system satisfies: -1.57≤f² / R⁴≤-1.39; -1.99≤f² / (D²m-d²m)≤-1.72; Wherein, R4 is the radius of curvature of the image-side surface of the second lens, f2 is the effective focal length of the second lens, D2m is the outer diameter of the image-side surface of the second spacer element, and d2m is the inner diameter of the image-side surface of the second spacer element.

11. The optical system according to any one of claims 1-9, characterized in that, The reflective element satisfies: 106.47mm ≤ FG ≤ 114.81mm; Where FG is the focal length of the reflective element.

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