Optical system

Abstract

The present application relates to an optical system, comprising a lens barrel with a receiving space, an imaging lens group and a plurality of spacer elements are arranged in the receiving space, the imaging lens group comprises, in order from the object side to the image side along the optical axis, a first lens with positive refractive power, a second lens with positive refractive power, a third lens with negative refractive power, a fourth lens with positive refractive power, a fifth lens with negative refractive power and a sixth lens with positive refractive power, a total of six lenses with refractive power; the plurality of spacer elements at least includes: a fourth spacer element located on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens; a fifth spacer element located on the image side of the fifth lens and at least partially in contact with the image side surface of the fifth lens; the optical system satisfies: 2.68≤EP45 / (T45+T56)≤6.07; -0.90≤R10*N5 / d5s≤-0.82. The present application can adjust the optical system to be in the ideal position, and effectively reduce the problem of stray light caused by the large interval difference between the fifth and sixth lenses.

Description

Technical Field

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

[0002] With the rapid development and widespread adoption of mobile phones and other electronic devices, optical lenses are also undergoing continuous upgrades and innovations. To meet users' ever-increasing demands for shooting capabilities—including richer details, a wider imaging range, and superior image clarity—optimizing optical system performance has become a key focus of current research and development.

[0003] The increased number of elements in a six-element optical imaging lens improves the system's utilization of incident light, especially in low-light conditions, enabling it to capture more effective photons, reduce noise, and enhance detail reproduction, thus ensuring high imaging performance. Simultaneously, the increased number of elements, along with the corresponding increase in the number of supporting and mounting mechanisms and components, enhances the design freedom of the lens structure, making six-element optical imaging lenses more structurally competitive.

[0004] Currently, six-element optical imaging lenses have a large difference between the fifth and sixth lenses, and the spacer elements are close to the light source, which makes them prone to stray light. Therefore, how to optimize the optical path structure and the layout of the spacer elements, and suppress stray light, so that the optical system can maintain a clean and clear imaging effect in complex lighting environments, remains an urgent problem 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 improves imaging clarity, reduces the risk of stray light in the optical system, and improves imaging quality.

[0006] To achieve the above-mentioned objective, the present invention provides an optical system comprising a lens barrel having a receiving space, wherein an imaging lens group and a plurality of spacer elements are disposed within the receiving space.

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

[0008] The plurality of spacers includes at least: a fourth spacer located on the image side of the fourth lens and in at least partial contact with the image side surface of the fourth 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] 2.68≤EP45 / (T45+T56)≤6.07;

[0011] -0.90≤R10*N5 / d5s≤-0.82;

[0012] Wherein, T45 is the air gap between the fourth lens and the fifth lens on the optical axis, T56 is the air gap between the fifth lens and the sixth lens on the optical axis, EP45 is the spacing distance between the fourth spacer element and the fifth spacer element along the optical axis, d5s is the inner diameter of the object side of the fifth spacer element, R10 is the radius of curvature of the image side of the fifth lens, and N5 is the refractive index of the fifth lens.

[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: 8.92≤f1 / (EP01+CT1)≤16.85;

[0015] Wherein, f1 is the effective focal length of the first lens, 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.

[0016] 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;

[0017] The optical system satisfies: 5.99≤R1*N1 / d1s≤8.52;

[0018] Wherein, R1 is the radius of curvature of the object-side surface of the first lens, N1 is the refractive index of the first lens, and d1s is the inner diameter of the object-side surface of the first spacer element.

[0019] 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;

[0020] The optical system satisfies: 3.48 ≤ R² / D₁s ≤ 11.36;

[0021] Wherein, R2 is the radius of curvature of the image side of the first lens, and D1s is the outer diameter of the object side of the first spacer element.

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

[0023] The optical system satisfies: -17.54≤R2*d1m / (R4*d2s)≤-6.91;

[0024] Wherein, R2 is the radius of curvature of the image side of the first lens, d1m is the inner diameter of the image side of the first spacer element, R4 is the radius of curvature of the image side of the second lens, and d2s is the inner diameter of the object side of the second spacer element.

[0025] According to one technical solution of the present invention, the plurality of spacer elements further includes a second spacer element located on the image side of the second lens and in at least partial contact with the image side side of the second lens;

[0026] The optical system satisfies: 13.11 ≤ R3*N2 / d2s ≤ 35.78;

[0027] Wherein, R3 is the radius of curvature of the object-side surface of the second lens, N2 is the refractive index of the second lens, and d2s is the inner diameter of the object-side surface of the second spacer element.

[0028] According to one technical solution of the present invention, the plurality of spacers further includes a first spacer located on the image side of the first lens and in at least partial contact with the image side of the first lens, and a second spacer located on the image side of the second lens and in at least partial contact with the image side of the second lens;

[0029] The optical system satisfies: 2.98 ≤ f2 / (EP12+CT2) ≤ 4.97;

[0030] Where f2 is the effective focal length of the second lens, EP12 is the spacing distance between the first spacer element and the second spacer element along the optical axis, and CT2 is the center thickness of the second lens.

[0031] According to one technical solution of the present invention, the plurality of spacer elements further includes a second spacer element located on the image side of the second lens and in at least partial contact with the image side side of the second lens;

[0032] The optical system satisfies: 3.96≤R5 / (D2m-d2m)≤12.87;

[0033] Wherein, R5 is the radius of curvature of the object side of the third lens, D2m is the outer diameter of the image side of the second spacer element, and d2m is the inner diameter of the image side of the second spacer element.

[0034] 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;

[0035] The optical system satisfies: 1.95≤R6*N3 / d3s≤2.54;

[0036] Wherein, R6 is the radius of curvature of the image side of the third lens, N3 is the refractive index of the third lens, and d3s is the inner diameter of the object side of the third spacer element.

[0037] According to one technical solution of the present invention, the plurality of spacer elements further includes a second spacer element located on the image side of the second lens and in at least partial contact with the image side of the second lens, and a third spacer element located on the image side of the third lens and in at least partial contact with the image side of the third lens;

[0038] The optical system satisfies: 3.77≤T34 / T23≤6.08; 0.97≤(CT3+T34) / EP23≤1.35;

[0039] Wherein, T23 is the air gap between the second lens and the third lens on the optical axis, T34 is the air gap between the third lens and the fourth lens on the optical axis, CT3 is the center thickness of the third lens, and EP23 is the spacing distance between the second spacer element and the third spacer element along the optical axis.

[0040] According to one technical solution of the present invention, the plurality of spacer elements further includes a second spacer element located on the image side of the second lens and in at least partial contact with the image side side of the second lens;

[0041] The optical system satisfies: 2.76 ≤ d²m / YC32 ≤ 3.15;

[0042] Wherein, d2m is the inner diameter of the image-side surface of the second spacer element, and Yc32 is the vertical distance from the intersection of the positive and negative curvature changes of the image-side surface of the fifth lens to the optical axis.

[0043] 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 of the third lens; the optical system satisfies: -4.18≤(SAG41+SAG42) / EP34≤-2.80;

[0044] Wherein, SAG41 is the axial displacement between the intersection of the object side surface and the optical axis of the fourth lens and the vertex of the effective radius of the object side surface of the fourth lens; SAG42 is the axial displacement between the intersection of the image side surface and the optical axis of the fourth lens and the vertex of the effective radius of the image side surface of the fourth lens; EP34 is the air gap along the optical axis between the third spacer element and the fourth spacer element.

[0045] According to one technical solution of the present invention, the optical system satisfies: -3.30≤d4s / (R7*CT4)≤-2.55;

[0046] Wherein, d4s is the inner diameter of the object side surface of the fourth spacer element, R7 is the radius of curvature of the object side surface of the fourth lens, and CT4 is the center thickness of the fourth lens.

[0047] According to one technical solution of the present invention, the optical system satisfies: 3.86≤f6 / d0m≤8.49;

[0048] Where f6 is the effective focal length of the sixth lens, and d0m is the inner diameter of the image-side end face of the lens barrel.

[0049] The beneficial effects of this invention are:

[0050] The optical system of this application is a six-element optical lens. The ratio of the distance between the fourth and fifth spacers along the optical axis to the sum of the air gaps between the fourth and fifth lenses and between the fifth and sixth lenses determines whether the light rays in the optical system can be in the ideal position when passing through each lens. Because the distance between the fourth and fifth spacers along the optical axis is large, the step difference between the fifth and sixth lenses is large, and the spacers are close to the light rays, stray light is prone to occur at this position. By constraining the radius of curvature of the image side of the fifth lens, the refractive index of the fifth lens, and the inner diameter of the object side of the fifth spacer, the size of the object side of the fifth spacer can be effectively constrained. This reduces the reflection of light rays on the inner diameter surface of the fifth spacer, thus reducing the risk of edge rays entering the non-transparent area of ​​the sixth lens and effectively reducing the intensity of stray light energy. Attached Figure Description

[0051] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the 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 creative effort.

[0052] Figure 1A , Figure 1B and Figure 1CA structural layout diagram and schematic diagram of some parameters of an optical system according to the present invention are shown;

[0053] Figure 2A and Figure 2B Schematic diagrams of two optical systems according to Embodiment 1 of this application are shown;

[0054] Figure 3A , Figure 3B , Figure 3C and Figure 3D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical system according to Embodiment 1 of this application are shown respectively.

[0055] Figure 4A and Figure 4B Schematic diagrams of two optical systems according to Embodiment 2 of this application are shown;

[0056] Figure 5A , Figure 5B , Figure 5C and Figure 5D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical system according to Embodiment 2 of this application are shown respectively.

[0057] Figure 6A and Figure 6B Schematic diagrams of two optical systems according to Embodiment 3 of this application are shown;

[0058] Figure 7A , Figure 7B , Figure 7C and Figure 7D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical system according to Embodiment 3 of this application are shown respectively.

[0059] Figure 8A and Figure 8B Schematic diagrams of two optical systems according to Embodiment 4 of this application are shown;

[0060] Figure 9A , Figure 9B , Figure 9C and Figure 9D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical system according to Embodiment 4 of this application are shown respectively.

[0061] Figure 10A and Figure 10B Schematic diagrams of two optical systems according to Embodiment 4 of this application are shown;

[0062] Figure 11A , Figure 11B , Figure 11C and Figure 11D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical system according to Embodiment 4 of this application are shown respectively.

[0063] Figure 12A and Figure 12B The optical path diagram and spot diagram are shown when the optical system satisfies EP45 / (T45+T56)=5.58 and R10*N5 / d5s=-0.88;

[0064] Figure 13A and Figure 13B The optical path diagram and spot diagram of the optical system satisfying EP45 / (T45+T56)=5.58 and R10*N5 / d5s=-1.12 are shown.

[0065] Figure 14A and Figure 14B The optical path diagram and spot diagram are shown when the optical system satisfies: EP45 / (T45+T56)=5.58 and R10*N5 / d5s=-0.67. Detailed Implementation

[0066] 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.

[0067] 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 second lens or the third lens, or the first lens may also be referred to as the first lens element.

[0068] 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.

[0069] In this paper, the paraxial region refers to the area near the optical axis. If the lens surface is convex and its location is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and its location 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, the surface of each lens closest to the subject is called the object-side surface, and the surface of each lens closest to the image plane is called the image-side surface. For the object-side surface, when the R value is positive, it is considered convex, and when the R value is negative, it is considered concave; for the image-side surface, when the R value is positive, it is considered concave, and when the R value is negative, it is considered convex.

[0070] In this application, the object side refers to the side of the optical system facing the object being photographed (not shown in the figure), and the image side refers to the side of the optical system facing the imaging plane. hereinafter, the object side of a lens refers to the surface of the lens facing the object being photographed (not shown in the figure), and the image side of a lens refers to the surface of the lens facing the imaging plane. The object side of a spacer element refers to the surface of the spacer element facing the object being photographed (not shown in the figure), and the image side of the spacer element refers to the surface of the spacer element facing the imaging plane.

[0071] In the structural schematic diagram shown in this application, the left side is the object side and the right side is the image side.

[0072] 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.

[0073] 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.

[0074] To address the problem of stray light risk caused by the large step difference between the fifth and sixth lenses and the close proximity of the spacer elements to the light in existing six-element optical systems, this invention provides an optical system comprising a lens barrel, an imaging lens group, and multiple spacer elements.

[0075] like Figure 1A , Figure 1B and Figure 1C As shown, the imaging lens group of an exemplary embodiment of the present invention includes six lenses with optical power, which are sequentially included 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, wherein each lens is independent of the others and there is an air gap between each lens on the optical axis.

[0076] The plurality of spacer elements includes at least a first spacer element to a fifth spacer element; wherein, the first spacer element is located on the image side of the first lens and at least partially contacts the image side of the first lens; the second spacer element is located on the image side of the second lens and at least partially contacts the image side of the second lens; the third spacer element is located on the image side of the third lens and at least partially contacts the image side of the third lens; the fourth spacer element is located on the image side of the fourth lens and at least partially contacts the image side of the fourth lens; and the fifth spacer element is located on the image side of the fifth lens and at least partially contacts the image side of the fifth lens.

[0077] 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.

[0078] In some embodiments of the present invention, the optical system may also include color filters and / or protective glass.

[0079] This application provides an optical system including 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 with positive optical power, a second lens with positive optical power, a third lens with negative optical power, a fourth lens with positive optical power, a fifth lens with negative optical power, and a sixth lens with positive optical power. This helps to balance system aberrations, meet the characteristics of high resolution, and thus achieve better imaging results.

[0080] The optical system satisfies: 2.68≤EP45 / (T45+T56)≤6.07; -0.90≤R10*N5 / d5s≤-0.82; where T45 is the air gap between the fourth and fifth lenses on the optical axis, T56 is the air gap between the fifth and sixth lenses on the optical axis, EP45 is the distance between the fourth and fifth spacers along the optical axis, d5s is the inner diameter of the object side of the fifth spacer, R10 is the radius of curvature of the image side of the fifth lens, and N5 is the refractive index of the fifth lens.

[0081] By adjusting the spacing between the fourth and fifth spacers along the optical axis and the air gap between the fifth and sixth lenses to satisfy 2.68≤EP45 / (T45+T56)≤6.07, it can be ensured that the light rays are in the ideal position when passing through each lens in the optical system. Because the spacing between the fourth and fifth spacers along the optical axis is large, the step difference between the fifth and sixth lenses is significant, and the spacers are close to the light rays, stray light is prone to occur at this position. By constraining the radius of curvature of the image side of the fifth lens, the refractive index of the fifth lens, and the inner diameter of the object side of the fifth spacer, the dimensions of the object side of the fifth spacer can be effectively constrained. This reduces the reflection of light on the inner diameter surface of the fifth spacer, thus reducing the risk of edge light rays entering the non-transparent area of ​​the sixth lens and effectively reducing stray light energy intensity.

[0082] In addition, please refer to the following Figures 12A to 14B As shown, Figure 12B The spot pattern of the optical system is shown when EP45 / (T45+T56)=5.58 and R10*N5 / d5s=-0.88. Within the range, the maximum energy density of the spot in the lens spot pattern is 4.2E-5, and the system has no stray light. Figure 13B The image shows the spot pattern of an optical system that satisfies EP45 / (T45+T56)=5.58 and R10*N5 / d5s=-1.12. When the optical system satisfies EP45 / (T45+T56)=5.58 and R10*N5 / d5s=-1.12, it exceeds the lower limit of the range. The maximum energy density of the spot in the image is 6.7E-5, and stray light exists in the system. Figure 14B The image shows the spot pattern of the optical system when EP45 / (T45+T56)=5.58 and R10*N5 / d5s=-0.67. When EP45 / (T45+T56)=5.58 and R10*N5 / d5s=-0.67, it exceeds the upper limit of the range, and the maximum energy density of the spot in the lens spot pattern is 5.3E-5, indicating that stray light exists in the system.

[0083] In some embodiments of the present invention, the optical system satisfies: 8.92≤f1 / (EP01+CT1)≤16.85; where f1 is the effective focal length of the first lens, 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.

[0084] By controlling the distance between the object-side end face of the lens barrel and the first spacer element along the optical axis, non-imaging light rays can be effectively blocked from reaching the sensor after reflection on the inner wall of the lens barrel, thereby reducing ghosting and light spots. At the same time, mechanical interference can be avoided, ensuring that the first lens has enough space and will not touch the lens barrel or other components during assembly or vibration. By limiting the ratio of the effective focal length of the first lens to the sum of the distance between the object-side end face of the lens barrel and the first spacer element along the optical axis and the center thickness of the first lens within a reasonable range, the angle of the incident light rays can be controlled, laying a good foundation for subsequent lens aberration correction and facilitating the realization of high-performance imaging.

[0085] In some embodiments of the present invention, the optical system satisfies: 5.99≤R1*N1 / d1s≤8.52; where R1 is the radius of curvature of the object-side surface of the first lens, N1 is the refractive index of the first lens, and d1s is the inner diameter of the object-side surface of the first spacer element.

[0086] By constraining the proportional relationship between the curvature and material properties of the first lens and its allowable aperture, the optical power and aperture of the lens are balanced, advanced aberrations are suppressed, and unobstructed light rays at the edge of the field of view are ensured to pass through, thereby improving relative illumination. At the same time, the radius of curvature of the first lens is one of the key factors that determine the overall length and front aperture of the lens. By controlling the radius of curvature and refractive index, it is beneficial to coordinate the overall length and front aperture of the system, thereby achieving an ultra-thin design.

[0087] In some embodiments of the present invention, the optical system satisfies: 3.48≤R2 / D1s≤11.36; where R2 is the radius of curvature of the image side of the first lens, and D1s is the outer diameter of the object side of the first spacer element.

[0088] By constraining the proportional relationship between the radius of curvature of the image side of the first lens and the outer diameter of the object side of the first spacer element, it is beneficial to correct the aberrations of the optical system; by constraining the outer diameter of the object side of the first spacer element, the structural strength of the spacer element can be ensured and the system stability can be improved.

[0089] In some embodiments of the present invention, the optical system satisfies: -17.54≤R2*d1m / (R4*d2s)≤-6.91; where R2 is the radius of curvature of the image-side surface of the first lens, d1m is the inner diameter of the image-side surface of the first spacer element, R4 is the radius of curvature of the image-side surface of the second lens, and d2s is the inner diameter of the object-side surface of the second spacer element.

[0090] By controlling the inner diameters of the two consecutive spacers, the first and second spacers, the aperture of light in the front lens group is defined, which helps to achieve uniform relative illumination and avoid vignetting at the edges of the image. By optimizing the above relationship, it is ensured that the propagation path of edge light rays from the maximum field of view is effectively intercepted by the object-side inner diameter of the second spacer after passing through the image-side inner diameter of the first spacer, preventing them from illuminating the inner wall of the lens barrel or the non-effective diameter area of ​​the lens and forming reflections, thereby improving the signal-to-noise ratio and image contrast of the system.

[0091] In some embodiments of the present invention, the optical system satisfies: 13.11≤R3*N2 / d2s≤35.78; where R3 is the radius of curvature of the object-side surface of the second lens, N2 is the refractive index of the second lens, and d2s is the inner diameter of the object-side surface of the second spacer element.

[0092] By constraining the radius of curvature of the object-side surface of the second lens and the refractive index of the second lens, the optical power of the second lens can be controlled, which is beneficial for correcting spherical aberration and coma generated by the first lens. Simultaneously, the ratio of the second lens's radius of curvature R3 to d2s constrains the object-side surface radius of curvature R3 of the second lens, limiting it to a reasonable range and preventing the lens surface shape from becoming too extreme. This reduces the molding difficulty and assembly sensitivity of the second lens, improving production yield. Furthermore, a reasonable curvature also makes the lens easier to position and fix during assembly, improving process stability and reliability.

[0093] In some embodiments of the present invention, the optical system satisfies: 2.98≤f2 / (EP12+CT2)≤4.97; where f2 is the effective focal length of the second lens, EP12 is the spacing distance between the first spacer element and the second spacer element along the optical axis, and CT2 is the center thickness of the second lens.

[0094] Defining the optical power contribution range of the second lens is beneficial for optimizing the system's aberration correction balance. The aforementioned conditional formula facilitates the correlation between the effective focal length of the second lens and the mechanical space, thereby achieving the desired optical effect by optimizing the effective focal length of the second lens. Avoiding the pursuit of optical performance at the expense of increasing space indefinitely is beneficial for achieving ultra-thin and miniaturized lens modules. By rationally setting the spacing between the first and second spacers along the optical axis, sufficient axial contact area is ensured for both spacers, allowing them to firmly press against the lens surface they contact. This provides stable support for the lens, preventing tilting or displacement during assembly or use, and improving the long-term reliability of the lens.

[0095] In some embodiments of the present invention, the optical system satisfies: 3.96≤R5 / (D2m-d2m)≤12.87; where R5 is the radius of curvature of the object side of the third lens, D2m is the outer diameter of the image side of the second spacer element, and d2m is the inner diameter of the image side of the second spacer element.

[0096] By linking the curvature of the optical surface to the mechanically defined space, the object-side surface of the third lens is ensured to have optimal curvature. This allows for effective correction of aberrations transmitted from the front lens group within the aperture defined by the inner diameter of the image-side surface of the second spacer element, while avoiding the introduction of new advanced aberrations. Since the spacer element directly affects its light-blocking effect, a wider spacer element means a larger light-blocking area, which can more effectively block ineffective light rays and reflected light incident at large angles, preventing stray light from being caused by multiple reflections between the inner wall of the lens barrel and the lens edge. Through the above conditional formula, the ring width of the second spacer element can be indirectly ensured not to be too narrow, thereby improving the light-blocking performance of the optical system, and thus improving the signal-to-noise ratio and image contrast of the optical system.

[0097] In some embodiments of the present invention, the optical system satisfies: 1.95≤R6*N3 / d3s≤2.54; where R6 is the radius of curvature of the image side of the third lens, N3 is the refractive index of the third lens, and d3s is the inner diameter of the object side of the third spacer element.

[0098] Constraining the radius of curvature of the image side of the third lens and the ratio of the refractive index of the third lens to the inner diameter of the object side of the third spacer element is beneficial for aberration correction and ensuring the illumination of the edge field of view. At the same time, the above conditional formula constrains the size of the radius of curvature of the image side of the third lens, limiting it to a very specific and reasonable range, reducing the molding difficulty and assembly sensitivity of the third lens, and improving the production yield.

[0099] In some embodiments of the present invention, the optical system satisfies: -3.30≤d4s / (R7*CT4)≤-2.55; where d4s is the inner diameter of the object side surface of the fourth spacer element, R7 is the radius of curvature of the object side surface of the fourth lens, and CT4 is the center thickness of the fourth lens.

[0100] The above-described conditional formulas constrain the optical power contribution of the object-side surface of the fourth lens. By limiting the ratio within this range, the correction effect of the object-side surface of the fourth lens on distortion and chromatic aberration is ensured, avoiding insufficient correction or excessive introduction of higher-order aberrations. By coordinating the inner diameter of the object-side surface of the fourth spacer element with the radius of curvature of the object-side surface of the fourth lens, the incident angle of the principal ray in the edge field of view is constrained, reducing vignetting, improving the relative illumination at the edge of the image, and avoiding bright and dark corners. At the same time, the central thickness of the fourth lens on the optical axis in the above-described conditional formulas constrains the physical shape of the fourth lens, avoiding difficulties in injection molding or the risk of pressure breakage during assembly due to excessive thickness of the fourth lens, thus improving manufacturability and mass production yield.

[0101] In some embodiments of the present invention, the optical system satisfies: 3.86≤f6 / d0m≤8.49; where f6 is the effective focal length of the sixth lens and d0m is the inner diameter of the image-side end face of the lens barrel.

[0102] By rationally controlling the optical power of the sixth lens, it can effectively correct residual astigmatism transmitted from the front group, ensuring a clear image across the entire image plane from center to edge, and avoiding blurring or scattering at the edges. The inner diameter of the rear end face of the lens barrel closest to the imaging plane determines which light rays ultimately reach the sensor. By limiting its matching with the effective focal length of the sixth lens, it is ensured that the inner diameter of the rear end face of the lens barrel closest to the imaging plane can effectively intercept non-imaging light rays, improving image quality. At the same time, the size of the inner diameter of the rear end face of the lens barrel closest to the imaging plane is a key mechanical dimension determining the height and volume of the lens rear end. Controlling its ratio with the effective focal length of the sixth lens allows for a compact and ultra-thin design of the entire camera module.

[0103] In some embodiments of the present invention, the optical system satisfies: 3.77≤T34 / T23≤6.08; 0.97≤(CT3+T34) / EP23≤1.35; where T23 is the air gap between the second lens and the third lens on the optical axis, T34 is the air gap between the third lens and the fourth lens on the optical axis, CT3 is the center thickness of the third lens, and EP23 is the spacing distance between the second spacer element and the third spacer element along the optical axis.

[0104] The condition 3.77≤T34 / T23≤6.08 constrains the proportional relationship between the air gap T34 between the third and fourth lenses on the optical axis and the air gap T23 between the second and third lenses on the optical axis. This provides degrees of freedom for correcting field curvature and astigmatism, while also helping to control distortion and avoid advanced aberrations that may be caused by the gaps. The condition 0.97≤(CT3+T34) / EP23≤1.35 facilitates a tighter fit between the second and third spacer elements, which can better compensate for the different thermal expansion and contraction effects between components when the temperature changes, reduce temperature drift, and improve the performance consistency of the product under different ambient temperatures.

[0105] In some embodiments of the present invention, the optical system satisfies: 2.76≤d2m / YC32≤3.15; where d2m is the inner diameter of the image-side surface of the second spacer element, and Yc32 is the vertical distance from the intersection of the positive and negative curvature changes of the image-side surface of the fifth lens to the optical axis.

[0106] Under the above conditions, the vertical distance from the intersection of the inner diameter of the image side of the second spacer element and the intersection of the positive and negative curvature changes of the image side of the fifth lens to the optical axis is correlated. This ensures that invalid light rays and reflected light generated by the front lens group and directed at the edge of the lens barrel at a large angle can be effectively intercepted by the inner diameter of the image side of the second spacer element before reaching the sensitive edge area of ​​the image side of the fifth lens. This cuts off the path of stray light propagation, prevents it from forming multiple reflections inside the lens barrel and finally reaching the sensor, and improves the signal-to-noise ratio and image contrast of the system.

[0107] In some embodiments of the present invention, the optical system satisfies: -4.18 ≤

[0108] (SAG41+SAG42) / EP34≤-2.80; where SAG41 is the axial displacement between the intersection of the object-side surface of the fourth lens and the optical axis and the vertex of the effective radius of the object-side surface of the fourth lens; SAG42 is the axial displacement between the intersection of the image-side surface of the fourth lens and the optical axis and the vertex of the effective radius of the image-side surface of the fourth lens; and EP34 is the air gap between the third spacer element and the fourth spacer element along the optical axis.

[0109] The sum of the axial displacement between the intersection of the object-side surface and the optical axis of the fourth lens and the vertex of the effective radius of the object-side surface of the fourth lens, and the axial displacement between the intersection of the image-side surface and the optical axis of the fourth lens and the vertex of the effective radius of the image-side surface of the fourth lens, is a key indicator determining the overall curvature and effective optical power of the fourth lens. The above conditional formula ensures that the fourth lens has the best overall shape, which is conducive to efficiently correcting specific aberrations and achieving aberration balance in the system. At the same time, this ratio ensures that the physical shape of the fourth lens can be perfectly accommodated and compressed within the mechanical space defined by the third and fourth spacers, achieving optimal axial positioning and the highest structural reliability.

[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 system 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 better 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 system, thereby reducing the number of lenses and the size of the lenses, and achieving lens miniaturization.

[0113] When aspherical lenses are used, the surface shape of each aspherical lens in the optical system can be defined using, but is not limited to, the following aspherical formulas:

[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 10A 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 system differ; specific differences can be found in 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. Furthermore, it should be noted that in Embodiment 1, there are two examples of optical systems 1001 and 1002; in Embodiment 2, there are two examples of optical systems 2001 and 2002; in Embodiment 3, there are two examples of optical systems 3001 and 3002; in Embodiment 4, there are two examples of optical systems 4001 and 4002; and in Embodiment 5, there are two examples of optical systems 5001 and 5002. The optical systems in different examples have different structures, but the optical parameters of the optical systems in the two examples in the same embodiment are the same, that is, the parameters such as the radius of curvature, center thickness and other parameters of the first lens to the sixth lens, as well as the spacing distance between the lenses and the higher-order term coefficients are the same.

[0117] Example 1

[0118] The following is for reference Figures 2A to 3D The optical system 1001 and optical system 1002 according to Embodiment 1 of this application are described. Figure 2A and Figure 2B Schematic diagrams of optical system 1001 and optical system 1002 according to Embodiment 1 of this application are shown respectively.

[0119] like Figure 2A and Figure 2B As shown, the structural schematic diagrams of optical system 1001 and optical system 1002 both include a lens barrel P0, imaging lens groups E1 to E6, and multiple spacer elements P1 to P5.

[0120] 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 positive optical power, a third lens E3 with negative optical power, a fourth lens E4 with positive optical power, a fifth lens E5 with negative optical power, and a sixth lens E6 with positive optical power. Specifically, the object side S1 of the first lens E1 is convex, and its image side S2 is concave; the object side S3 and image side S4 of the second lens E2 are both convex; the object side S5 of the third lens E3 is convex, and its image side S6 is concave; the object side S7 of the fourth lens E4 is concave, and its image side S8 is convex; the object side S9 of the fifth lens E5 is concave, and its image side S10 is convex; and the object side S11 of the sixth lens E6 is convex, and its image side S12 is concave. An aperture stop is positioned before the first lens E1. Light from the object passes sequentially through surfaces S1 to S12 and is finally imaged onto the imaging surface S15. Surfaces S13 and S14 (not shown in the figure) can be the object-side and image-side surfaces of filters or protective glass, surface S15 (not shown in the figure) is the imaging surface, OBJ (not shown in the figure) is the object surface, and STO (not shown in the figure) is the aperture stop.

[0121] Table 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, wherein the units of radius of curvature and thickness are millimeters (mm).

[0122] Surface serial number Surface type radius of curvature thickness Refractive index Abbe number Conic coefficient OBJ spherical endless endless STO spherical endless 0.0742 S1 aspherical 6.1521 0.3255 1.546 56.14 -17.5653 S2 aspherical 15.2595 0.0902 -99.0000 S3 aspherical 13.8058 0.3570 1.546 56.14 -93.7288 S4 aspherical -1.8084 0.0505 0.6563 S5 aspherical 9.9175 0.2000 1.677 19.24 16.4419 S6 aspherical 3.1402 0.2367 0.1556 S7 aspherical -1.5633 0.6186 1.546 56.14 0.0627 S8 aspherical -0.6260 0.0500 -1.0231 S9 aspherical -0.7380 0.4234 1.644 23.52 -0.9934 S10 aspherical -1.6196 0.0601 -0.0100 S11 aspherical 0.8135 0.4433 1.677 19.24 -1.0006 S12 aspherical 0.6546 0.5616 -1.0204 S13 spherical endless 0.1100 1.518 64.20 S14 spherical endless 0.6370 S15 spherical endless

[0123] Table 1

[0124] Table 2 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 A 22 A 24 A 26 A 28 A 30 .

[0125]

[0126]

[0127] Table 2

[0128] like Figure 2A and 2BAs shown, both optical system 1001 and optical system 1002 include a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, and a fifth spacer element P5.

[0129] Figure 3A The on-axis chromatic aberration curve of the optical system of Embodiment 1 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 3B The astigmatism curves of the optical system of Embodiment 1 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 3C The distortion curves of the optical system of Embodiment 1 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 3D The magnification chromatic aberration curve of the optical system of Embodiment 1 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figures 3A to 3D As can be seen, the optical system given in Example 1 can achieve good imaging quality.

[0130] Example 2

[0131] The following is for reference Figures 4A to 5D The optical system 2001 and optical system 2002 according to Embodiment 2 of this application are described. Figure 4A and Figure 4B Schematic diagrams of optical system 2001 and optical system 2002 according to Embodiment 2 of this application are shown respectively.

[0132] like Figure 4A and Figure 4B As shown, the structural schematic diagrams of optical system 2001 and optical system 2002 both include a lens barrel P0, imaging lens groups E1 to E6, and multiple spacer elements P1 to P5.

[0133] 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 positive optical power, a third lens E3 with negative optical power, a fourth lens E4 with positive optical power, a fifth lens E5 with negative optical power, and a sixth lens E6 with positive optical power. Specifically, the object side S1 of the first lens E1 is convex, and its image side S2 is concave; the object side S3 and image side S4 of the second lens E2 are both convex; the object side S5 of the third lens E3 is convex, and its image side S6 is concave; the object side S7 of the fourth lens E4 is concave, and its image side S8 is convex; the object side S9 of the fifth lens E5 is concave, and its image side S10 is convex; and the object side S11 of the sixth lens E6 is convex, and its image side S12 is concave. An aperture stop is positioned before the first lens E1. Light from the object passes sequentially through surfaces S1 to S12 and is finally imaged onto the imaging surface S15. Surfaces S13 and S14 (not shown in the figure) can be the object-side and image-side surfaces of filters or protective glass, surface S15 (not shown in the figure) is the imaging surface, OBJ (not shown in the figure) is the object surface, and STO (not shown in the figure) is the aperture stop.

[0134] Table 3 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, wherein the units of radius of curvature and thickness are millimeters (mm).

[0135]

[0136]

[0137] Table 3

[0138] 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 A 22 A 24 A 26 A 28 A 30 .

[0139]

[0140]

[0141] Table 4

[0142] like Figure 4A and Figure 4B As shown, both optical system 2001 and optical system 2002 include a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, and a fifth spacer element P5.

[0143] Figure 5A The on-axis chromatic aberration curve of the optical system of Embodiment 2 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 5B The astigmatism curves of the optical system of Embodiment 2 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 5C The distortion curves of the optical system in Embodiment 2 are shown, representing the distortion magnitude values ​​corresponding to different image heights. Figure 5D The magnification chromatic aberration curve of the optical system in Embodiment 2 is shown, representing the deviation of different image heights on the imaging plane after light passes through the lens. According to... Figures 5A to 5D It can be seen that the optical system given in Example 2 can achieve good imaging quality.

[0144] Example 3

[0145] The following is for reference Figures 6A to 7D The optical systems 3001 and 3002 according to Embodiment 3 of this application are described. Figure 6A and Figure 6B Schematic diagrams of optical system 3001 and optical system 3002 according to Embodiment 3 of this application are shown respectively.

[0146] like Figure 6A and Figure 6B As shown, the structural schematic diagrams of optical systems 3001 and 3002 both include a lens barrel P0, imaging lens groups E1 to E6, and multiple spacer elements P1 to P5.

[0147] In Embodiment 3, the schematic diagrams of optical systems 3001 and 3002 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 positive optical power, a third lens E3 with negative optical power, a fourth lens E4 with positive optical power, a fifth lens E5 with negative optical power, and a sixth lens E6 with positive optical power. Specifically, the object side S1 of the first lens E1 is convex, and its image side S2 is concave; the object side S3 and image side S4 of the second lens E2 are both convex; the object side S5 of the third lens E3 is convex, and its image side S6 is concave; the object side S7 of the fourth lens E4 is concave, and its image side S8 is convex; the object side S9 of the fifth lens E5 is concave, and its image side S10 is convex; and the object side S11 of the sixth lens E6 is convex, and its image side S12 is concave. An aperture stop is positioned before the first lens E1. Light from the object passes sequentially through surfaces S1 to S12 and is finally imaged onto the imaging surface S15. Surfaces S13 and S14 (not shown in the figure) can be the object-side and image-side surfaces of filters or protective glass, surface S15 (not shown in the figure) is the imaging surface, OBJ (not shown in the figure) is the object surface, and STO (not shown in the figure) is the aperture stop.

[0148] Table 5 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, wherein the units of radius of curvature and thickness are millimeters (mm).

[0149] Surface serial number Surface type radius of curvature thickness Refractive index Abbe number Conic coefficient OBJ spherical endless endless STO spherical endless 0.0175 S1 aspherical 6.3928 0.5000 1.546 56.14 21.4292 S2 aspherical 39.6572 0.0892 99.0000 S3 aspherical 26.5288 0.6100 1.546 56.14 -96.4129 S4 aspherical -1.8384 0.0710 0.7536 S5 aspherical 15.3271 0.2600 1.677 19.24 99.0000 S6 aspherical 2.9926 0.4315 -0.4352 S7 aspherical -1.6323 0.6300 1.546 56.14 0.1874 S8 aspherical -0.6628 0.1000 -1.0721 S9 aspherical -0.7745 0.3610 1.644 23.52 -0.9776 S10 aspherical -1.7085 0.1562 -0.0546 S11 aspherical 0.9099 0.4708 1.677 19.24 -0.9530 S12 aspherical 0.7363 0.8304 -1.0196 S13 spherical endless 0.1100 1.518 64.20 S14 spherical endless 0.3469 S15 spherical endless

[0150] Table 5

[0151] Table 6 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 A 22 A 24 A 26 A 28 A 30 .

[0152]

[0153]

[0154] Table 6

[0155] like Figure 6A and 6BAs shown, both optical system 3001 and optical system 3002 include a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, and a fifth spacer element P5.

[0156] Figure 7A The on-axis chromatic aberration curve of the optical system of Embodiment 3 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 7B The astigmatism curves of the optical system of Embodiment 3 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 7C The distortion curves of the optical system in Embodiment 3 are shown, representing the distortion magnitude values ​​corresponding to different image heights. Figure 7D The magnification chromatic aberration curve of the optical system in Embodiment 3 is shown, representing the deviation of different image heights on the imaging plane after light passes through the lens. According to... Figures 7A to 7D As can be seen, the optical system given in Example 3 can achieve good imaging quality.

[0157] Example 4

[0158] The following is for reference Figures 8A to 9D The optical systems 4001 and 4002 according to Embodiment 4 of this application are described. Figure 8A and Figure 8B Schematic diagrams of optical system 4001 and optical system 4002 according to Embodiment 4 of this application are shown respectively.

[0159] like Figure 8A and Figure 8B As shown, the structural schematic diagrams of optical systems 4001 and 4002 both include a lens barrel P0, imaging lens groups E1 to E6, and multiple spacer elements P1 to P5.

[0160] In Embodiment 4, the schematic diagrams of optical systems 4001 and 4002 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 positive optical power, a third lens E3 with negative optical power, a fourth lens E4 with positive optical power, a fifth lens E5 with negative optical power, and a sixth lens E6 with positive optical power. Specifically, the object side S1 of the first lens E1 is convex, and its image side S2 is concave; the object side S3 and image side S4 of the second lens E2 are both convex; the object side S5 of the third lens E3 is convex, and its image side S6 is concave; the object side S7 of the fourth lens E4 is concave, and its image side S8 is convex; the object side S9 of the fifth lens E5 is concave, and its image side S10 is convex; and the object side S11 of the sixth lens E6 is convex, and its image side S12 is concave. An aperture stop is positioned before the first lens E1. Light from the object passes sequentially through surfaces S1 to S12 and is finally imaged onto the imaging surface S15. Surfaces S13 and S14 (not shown in the figure) can be the object-side and image-side surfaces of filters or protective glass, surface S15 (not shown in the figure) is the imaging surface, OBJ (not shown in the figure) is the object surface, and STO (not shown in the figure) is the aperture stop.

[0161] Table 7 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, wherein the units of radius of curvature and thickness are millimeters (mm).

[0162]

[0163]

[0164] Table 7

[0165] Table 8 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 A 22 A 24 A 26 A 28 A 30 .

[0166] Face number <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 ]]> <![CDATA[A 12 ]]> <![CDATA[A 14 ]]> <![CDATA[A 16 ]]> S1 -1.3995E-01 1.3583E+00 -4.3636E+01 8.1013E+02 -1.0058E+04 8.6683E+04 -5.3206E+05 S2 -1.9664E-01 -1.4243E+00 1.8547E+01 -2.0245E+02 1.4720E+03 -6.9899E+03 2.0033E+04 S3 -1.1439E-01 -4.5772E-02 -1.2954E+01 1.8817E+02 -1.7137E+03 1.0579E+04 -4.5835E+04 S4 1.9663E-01 -3.2432E+00 2.5504E+01 -1.9395E+02 1.2699E+03 -6.5701E+03 2.5561E+04 S5 -5.9484E-02 -1.5684E+00 -9.2614E-01 5.9367E+01 -4.1950E+02 1.6934E+03 -4.5373E+03 S6 -1.2788E-01 1.6522E-01 -6.5739E+00 4.9227E+01 -2.0857E+02 5.8538E+02 -1.1507E+03 S7 -1.7393E-01 1.0339E+00 -6.2629E+00 2.5622E+01 -6.8768E+01 1.4537E+02 -2.6105E+02 S8 7.5471E-01 -2.1580E+00 1.1532E+00 1.5237E+01 -6.6553E+01 1.5664E+02 -2.4516E+02 S9 1.5298E+00 -5.2172E+00 1.2495E+01 -1.9631E+01 2.0692E+01 -1.4320E+01 5.4696E+00 S10 1.7997E-01 -9.3580E-01 2.2331E+00 -3.2510E+00 3.2574E+00 -2.2471E+00 9.3996E-01 S11 -3.6439E-01 -1.2586E-01 7.1327E-01 -1.1320E+00 1.2204E+00 -1.0166E+00 6.5788E-01 S12 -4.6611E-01 2.2326E-01 4.1161E-02 -1.7913E-01 1.6096E-01 -8.5603E-02 3.0973E-02 Face number <![CDATA[A 18 ]]> <![CDATA[A 20 ]]> <![CDATA[A 22 ]]> <![CDATA[A 24 ]]> <![CDATA[A 262 ]]> <![CDATA[A 28 ]]> <![CDATA[A 30 ]]> S1 2.3582E+06 -7.5684E+06 1.7426E+07 -2.8068E+07 3.0042E+07 -1.9214E+07 5.5660E+06 S2 -2.2053E+04 -6.7987E+04 3.5466E+05 -7.5197E+05 8.9355E+05 -5.8139E+05 1.6201E+05 S3 1.4104E+05 -3.0661E+05 4.6081E+05 -4.5771E+05 2.7492E+05 -8.1713E+04 5.8606E+03 S4 -7.3082E+04 1.5158E+05 -2.2442E+05 2.3052E+05 -1.5577E+05 6.2164E+04 -1.1084E+04 S5 8.4687E+03 -1.1102E+04 1.0017E+04 -5.9036E+03 2.0323E+03 -3.0316E+02 -3.2207E+00 S6 1.6202E+03 -1.6408E+03 1.1831E+03 -5.9166E+02 1.9476E+02 -3.7917E+01 3.3058E+00 S7 3.7579E+02 -4.0005E+02 2.9935E+02 -1.5165E+02 4.9389E+01 -9.3261E+00 7.7625E-01 S8 2.6880E+02 -2.0978E+02 1.1622E+02 -4.4752E+01 1.1402E+01 -1.7297E+00 1.1834E-01 S9 3.3446E-01 -1.8985E+00 1.2898E+00 -4.9275E-01 1.1591E-01 -1.5743E-02 9.5015E-04 S10 -8.0022E-02 -1.7445E-01 1.2362E-01 -4.3322E-02 8.8502E-03 -1.0061E-03 4.9469E-05 S11 -3.2177E-01 1.1579E-01 -2.9909E-02 5.3725E-03 -6.3588E-04 4.4547E-05 -1.3985E-06 S12 -7.9884E-03 1.4902E-03 -2.0004E-04 1.8859E-05 -1.1853E-06 4.4589E-08 -7.5904E-10

[0167] Table 8

[0168] like Figure 8AAs shown, the optical system 4001 includes a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, and a fifth spacer element P5.

[0169] Figure 9A The on-axis chromatic aberration curve of the optical system of Embodiment 4 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 9B The astigmatism curves of the optical system of Embodiment 4 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 9C The distortion curves of the optical system in Embodiment 4 are shown, representing the distortion magnitude values ​​corresponding to different image heights. Figure 9D The magnification chromatic aberration curve of the optical system in Embodiment 4 is shown, representing the deviation of different image heights on the imaging plane after light passes through the lens. According to... Figures 9A to 9D As can be seen, the optical system given in Example 4 can achieve good imaging quality.

[0170] Example 5

[0171] The following is for reference Figures 10A to 11D The optical systems 5001 and 5002 according to Embodiment 5 of this application are described. Figure 10A and Figure 10B Schematic diagrams of optical systems 5001 and 5002 according to Embodiment 5 of this application are shown respectively.

[0172] like Figure 10A and Figure 10B As shown, the structural schematic diagrams of optical systems 5001 and 5002 both include a lens barrel P0, imaging lens groups E1 to E6, and multiple spacer elements P1 to P5.

[0173] In Embodiment 5, the schematic diagrams of optical systems 5001 and 5002 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 positive optical power, a third lens E3 with negative optical power, a fourth lens E4 with positive optical power, a fifth lens E5 with negative optical power, and a sixth lens E6 with positive optical power. Specifically, the object side S1 of the first lens E1 is convex, and its image side S2 is concave; the object side S3 and image side S4 of the second lens E2 are both convex; the object side S5 of the third lens E3 is convex, and its image side S6 is concave; the object side S7 of the fourth lens E4 is concave, and its image side S8 is convex; the object side S9 of the fifth lens E5 is concave, and its image side S10 is convex; and the object side S11 of the sixth lens E6 is convex, and its image side S12 is concave. An aperture stop is positioned before the first lens E1. Light from the object passes sequentially through surfaces S1 to S12 and is finally imaged onto the imaging surface S15. Surfaces S13 and S14 (not shown in the figure) can be the object-side and image-side surfaces of filters or protective glass, surface S15 (not shown in the figure) is the imaging surface, OBJ (not shown in the figure) is the object surface, and STO (not shown in the figure) is the aperture stop.

[0174] Table 9 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, wherein the units of radius of curvature and thickness are millimeters (mm).

[0175] Surface serial number Surface type radius of curvature thickness Refractive index Abbe number Conic coefficient OBJ spherical endless endless STO spherical endless 0.0761 S1 aspherical 5.5087 0.3217 1.546 56.14 -36.9154 S2 aspherical 14.2767 0.1069 94.8232 S3 aspherical 38.2061 0.3921 1.546 56.14 -38.6068 S4 aspherical -1.5691 0.0559 1.1109 S5 aspherical 10.7180 0.2600 1.677 19.24 98.9616 S6 aspherical 2.6787 0.3194 -0.0100 S7 aspherical -1.5104 0.5001 1.546 56.14 0.1080 S8 aspherical -0.6391 0.0500 -1.0606 S9 aspherical -0.7565 0.4253 1.644 23.52 -0.9771 S10 aspherical -1.5891 0.1542 -0.0282 S11 aspherical 0.8335 0.4500 1.677 19.24 -0.9599 S12 aspherical 0.6668 0.6409 -1.0169 S13 spherical endless 0.1100 1.518 64.20 S14 spherical endless 0.4938 S15 spherical endless

[0176] Table 9

[0177] 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 A 22 A 24 A 26 A 28 A 30 .

[0178]

[0179]

[0180] Table 10

[0181] like Figure 10A and 10BAs shown, optical systems 5001 and 5002 include a first spacer element P1, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, and a fifth spacer element P5.

[0182] Figure 11A The on-axis chromatic aberration curve of the optical system of Embodiment 5 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 11B The astigmatism curves of the optical system of Embodiment 5 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 11C The distortion curves of the optical system of Embodiment 5 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 11D The magnification chromatic aberration curve of the optical system of Embodiment 5 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figures 11A to 11D As can be seen, the optical system given in Example 5 can achieve good imaging quality.

[0183] 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 11 below.

[0184]

[0185]

[0186] Table 11

[0187] The basic parameters of the spacer elements and lens barrels of the optical systems 1001, 1002, 2001, 2002, 3001, 3002, 4001, 4002, 5001 and 5002 of Examples 1 to 5 are shown in Table 12 below, where the unit of each parameter is mm.

[0188]

[0189] Table 12

[0190] 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 13.

[0191]

[0192]

[0193] Table 13

[0194] 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 lens barrel having a receiving space, characterized in that, The containment space is equipped with an imaging lens group and multiple spacer elements. The imaging lens group comprises, sequentially from the object side to the image side along the optical axis: a first lens with positive optical power, a second lens with positive optical power, a third lens with negative optical power, a fourth lens with positive optical power, a fifth lens with negative optical power, and a sixth lens with positive optical power, totaling six lenses with optical power. The object side of the first lens is convex, and its image side is concave. Both the object side and image side of the second lens are convex. The object side of the third lens is convex, and its image side is concave. The object side of the fourth lens is concave, and its image side is convex. The object side of the fifth lens is concave, and its image side is convex. The object side of the sixth lens is convex, and its image side is concave. The plurality of spacers includes at least: a fourth spacer located on the image side of the fourth lens and in at least partial contact with the image side surface of the fourth 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: 2.68≤EP45 / (T45+T56)≤6.07; -0.90≤R10*N5 / d5s≤-0.82; 3.77≤T34 / T23≤6.08; Wherein, T23 is the air gap between the second lens and the third lens on the optical axis, T34 is the air gap between the third lens and the fourth lens on the optical axis, T45 is the air gap between the fourth lens and the fifth lens on the optical axis, T56 is the air gap between the fifth lens and the sixth lens on the optical axis, EP45 is the spacing distance between the fourth spacer element and the fifth spacer element along the optical axis, d5s is the inner diameter of the object side surface of the fifth spacer element, R10 is the radius of curvature of the image side surface of the fifth lens, and N5 is the refractive index of the fifth lens.

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: 8.92≤f1 / (EP01+CT1)≤16.85; Wherein, f1 is the effective focal length of the first lens, 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.

3. 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: 5.99≤R1*N1 / d1s≤8.52; Wherein, R1 is the radius of curvature of the object-side surface of the first lens, N1 is the refractive index of the first lens, and d1s is the inner diameter of the object-side surface of the first spacer element.

4. 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: 3.48 ≤ R² / D₁s ≤ 11.36; Wherein, R2 is the radius of curvature of the image side of the first lens, and D1s is the outer diameter of the object side of the first spacer element.

5. The optical system according to claim 1, characterized in that, The plurality of spacers further includes a first spacer located on the image side of the first lens and in at least partial contact with the image side of the first lens, and a second spacer located on the image side of the second lens and in at least partial contact with the image side of the second lens; The optical system satisfies: -17.54≤R2*d1m / (R4*d2s)≤-6.91; Wherein, R2 is the radius of curvature of the image side of the first lens, d1m is the inner diameter of the image side of the first spacer element, R4 is the radius of curvature of the image side of the second lens, and d2s is the inner diameter of the object side of the second spacer element.

6. The optical system according to claim 1, characterized in that, The plurality of spacer elements further includes a second spacer element located on the image side of the second lens and in at least partial contact with the image side surface of the second lens; The optical system satisfies: 13.11 ≤ R3*N2 / d2s ≤ 35.78; Wherein, R3 is the radius of curvature of the object-side surface of the second lens, N2 is the refractive index of the second lens, and d2s is the inner diameter of the object-side surface of the second spacer element.

7. The optical system according to claim 1, characterized in that, The plurality of spacers further includes a first spacer located on the image side of the first lens and in at least partial contact with the image side of the first lens, and a second spacer located on the image side of the second lens and in at least partial contact with the image side of the second lens; The optical system satisfies: 2.98 ≤ f2 / (EP12+CT2) ≤ 4.97; Where f2 is the effective focal length of the second lens, EP12 is the spacing distance between the first spacer element and the second spacer element along the optical axis, and CT2 is the center thickness of the second lens.

8. The optical system according to claim 1, characterized in that, The plurality of spacer elements further includes a second spacer element located on the image side of the second lens and in at least partial contact with the image side surface of the second lens; The optical system satisfies: 3.96≤R5 / (D2m-d2m)≤12.87; Wherein, R5 is the radius of curvature of the object side of the third lens, D2m is the outer diameter of the image side of the second spacer element, and d2m is the inner diameter of the image side of the second spacer element.

9. 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: 1.95 ≤ R6 * N3 / d3s ≤ 2.54; Wherein, R6 is the radius of curvature of the image side of the third lens, N3 is the refractive index of the third lens, and d3s is the inner diameter of the object side of the third spacer element.

10. The optical system according to claim 1, characterized in that, The plurality of spacers also includes a second spacer located on the image side of the second lens and in at least partial contact with the image side of the second lens, and a third spacer located on the image side of the third lens and in at least partial contact with the image side of the third lens; The optical system satisfies: 0.97≤(CT3+T34) / EP23≤1.35; Wherein, T34 is the air gap between the third lens and the fourth lens on the optical axis, CT3 is the center thickness of the third lens, and EP23 is the spacing distance between the second spacer element and the third spacer element along the optical axis.

11. The optical system according to claim 1, characterized in that, The plurality of spacer elements further includes a second spacer element located on the image side of the second lens and in at least partial contact with the image side surface of the second lens; The optical system satisfies: 2.76 ≤ d²m / YC32 ≤ 3.15; Wherein, d2m is the inner diameter of the image-side surface of the second spacer element, and Yc32 is the vertical distance from the intersection of the positive and negative curvature changes of the image-side surface of the fifth lens to the optical axis.

12. The optical system according to claim 1, characterized in that, The plurality of spacers also includes a third spacer located on the image side of the third lens and in at least partial contact with the image side of the third lens; the optical system satisfies: -4.18≤(SAG41+SAG42) / EP34≤-2.80; Wherein, SAG41 is the axial displacement between the intersection of the object side surface and the optical axis of the fourth lens and the vertex of the effective radius of the object side surface of the fourth lens; SAG42 is the axial displacement between the intersection of the image side surface and the optical axis of the fourth lens and the vertex of the effective radius of the image side surface of the fourth lens; EP34 is the air gap along the optical axis between the third spacer element and the fourth spacer element.

13. The optical system according to any one of claims 1-12, characterized in that, The optical system satisfies: -3.30≤d4s / (R7*CT4)≤-2.55; Wherein, d4s is the inner diameter of the object side surface of the fourth spacer element, R7 is the radius of curvature of the object side surface of the fourth lens, and CT4 is the center thickness of the fourth lens.

14. The optical system according to any one of claims 1-12, characterized in that, The optical system satisfies: 3.86 ≤ f6 / d0m ≤ 8.49; Where f6 is the effective focal length of the sixth lens, and d0m is the inner diameter of the image-side end face of the lens barrel.

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