Optical imaging lens

Abstract

The application provides an optical imaging lens, comprising a lens barrel, a lens set assembled in the lens barrel, and a plurality of spacing elements, wherein the lens set comprises, in sequence from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, at least one surface from an object side surface of the third lens to an imaging surface is a metasurface with a subwavelength microstructure, the plurality of spacing elements comprise a second spacing element, a third spacing element, and a fourth spacing element, and the optical imaging lens satisfies: 15.40≤f / ImgH×fno≤16.00; 1.95≤Tr1r6 / Tr7r10≤4.86; 2.60<EP34 / EP23≤4.41.

Description

Technical Field

[0001] This application relates to the field of optical device technology, and in particular to an optical imaging lens. Background Technology

[0002] As competition in smartphone imaging capabilities intensifies, high-magnification telephoto lenses have become standard equipment in flagship models. Consumers' demands for mobile photography have shifted from "shooting far" to "shooting clearly," making telephoto lenses a mainstream feature. However, limited by the internal space of mobile phones, telephoto lenses must achieve excellent image quality within a compact structure, presenting extremely high technical challenges. Currently, telephoto lenses in mobile devices on the market mainly face the dilemma of balancing aberration correction and miniaturization: in the lens group of a telephoto lens, the lens located in the middle is mainly used to correct aberrations. To fully correct aberrations, the proportion of the optical path modulation space represented by this lens in the total height of the optical lens needs to be increased. At this time, the optical path at the front and rear sections of the lens group is compressed, which cannot guarantee the field of view and image illumination, and the effective image area of ​​the imaging surface is reduced accordingly, which will reduce the image resolution. Summary of the Invention

[0003] The advantage of this application is that it provides a five-element telephoto lens, which achieves aberration correction by setting a large air gap between the third and fourth lenses to leave sufficient space for optical path modulation, and sets a metasurface to further compress the lens height, thereby achieving a miniaturized design.

[0004] This application provides an optical imaging lens, which includes a lens barrel, a lens group, and multiple spacer elements; The lens group is placed inside the lens barrel, and the lens group comprises, sequentially from the object side to the image side along the optical axis: A first lens having positive optical power, wherein the object side of the first lens is convex, and the first lens is made of glass; A second lens with optical power, wherein the object side of the second lens is convex and the image side of the second lens is concave; A third lens with negative optical power, wherein the object-side surface of the third lens is convex and the image-side surface of the third lens is concave; A fourth lens with negative optical power, wherein the object side of the fourth lens is concave and the image side of the fourth lens is convex; A fifth lens with positive optical power; At least one surface from the object-side surface of the third lens to the imaging surface is a metasurface; The plurality of spacer elements are disposed within the lens barrel, including: a second spacer element located between the second lens and the third lens, wherein the object-side surface of the second spacer element contacts the image-side surface of the second lens; a third spacer element located between the third lens and the fourth lens, wherein the object-side surface of the third spacer element contacts the image-side surface of the third lens; and a fourth spacer element located between the fourth lens and the fifth lens, wherein the object-side surface of the fourth spacer element contacts the image-side surface of the fourth lens. The optical imaging lens satisfies the following condition: 15.40≤f / ImgH×fno≤16.00; 1.95≤Tr1r6 / Tr7r10≤4.86; 2.60 < EP34 / EP23 ≤ 4.41; Wherein, f is the effective focal length of the optical imaging lens, ImgH is half the diagonal length of the effective pixel area on the imaging plane, fno is the relative aperture of the optical imaging lens, Tr1r6 is the distance on the optical axis from the object side of the first lens to the image side of the third lens, Tr7r10 is the distance on the optical axis from the object side of the fourth lens to the image side of the fifth lens, EP34 is the distance on the optical axis from the image side of the third spacer element to the object side of the fourth spacer element, and EP23 is the distance on the optical axis from the image side of the second spacer element to the object side of the third spacer element.

[0005] In some embodiments of this application, the metasurface includes a substrate and subwavelength microstructures formed on the substrate, wherein the substrate is a glass component or a plastic component.

[0006] In some embodiments of this application, the plurality of spacers further includes: a first spacer located between the first lens and the second lens, wherein the object-side surface of the first spacer partially contacts the image-side surface of the first lens; the optical imaging lens satisfies: 6.60 < f1 / (D1s-d1s) ≤ 8.80, where f1 is the effective focal length of the first lens, D1s is the outer diameter of the object-side surface of the first spacer, and d1s is the inner diameter of the object-side surface of the first spacer.

[0007] In some embodiments of this application, the optical imaging lens satisfies: 2.30 < R1 / CT1 ≤ 3.02, 2.05 < EP01 / SAG11 < 2.80; where R1 is the radius of curvature of the object-side surface of the first lens, CT1 is the center thickness of the first lens, EP01 is the distance along the optical axis from the object-side surface of the lens barrel to the object-side surface of the first spacer element, and SAG11 is the axial displacement from the intersection of the object-side surface of the first lens and the optical axis to the vertex of the optical effective radius of the object-side surface of the first lens.

[0008] In some embodiments of this application, the optical imaging lens satisfies: 2.45 < d1m / (D1m-d1m) < 4.75; where d1m is the inner diameter of the image-side surface of the first spacer element, and D1m is the outer diameter of the image-side surface of the first spacer element.

[0009] In some embodiments of this application, the optical imaging lens satisfies: 0.95≤EP12 / (d1s-d2s)<2.35; where EP12 is the distance along the optical axis from the image side of the first spacer element to the object side of the second spacer element, d1s is the inner diameter of the object side of the first spacer element, and d2s is the inner diameter of the object side of the second spacer element.

[0010] In some embodiments of this application, the optical imaging lens satisfies: 3.75 < (CT3 + T34) / (EP23 + CP3) ≤ 4.87; where EP23 is the distance along the optical axis from the image side of the second spacer element to the object side of the third spacer element, CP3 is the maximum thickness of the third spacer element along the optical axis, CT3 is the center thickness of the third lens, and T34 is the air gap between the third lens and the fourth lens along the optical axis.

[0011] In some embodiments of this application, the optical imaging lens satisfies: 3.55 < (R4 + R5) / D2s ≤ 6.57; where R4 is the radius of curvature of the image side of the second lens, R5 is the radius of curvature of the object side of the third lens, and D2s is the outer diameter of the object side of the second spacer element.

[0012] In some embodiments of this application, the optical imaging lens satisfies: 16.68≤L / (D0s-D0m)<24.75; where L is the maximum height of the lens barrel, D0s is the outer diameter of the object side of the lens barrel, and D0m is the outer diameter of the image side of the lens barrel.

[0013] In some embodiments of this application, the plurality of spacers further includes a third auxiliary spacer located between the third spacer and the fourth lens, wherein the object side of the third auxiliary spacer is in contact with the image side of the third spacer, and the optical imaging lens satisfies: -12.95≤f3 / (CP3+CP3b)≤-5.45; where f3 is the effective focal length of the third lens, CP3 is the maximum thickness of the third spacer along the optical axis, and CP3b is the maximum thickness of the third auxiliary spacer along the optical axis.

[0014] In some embodiments of this application, the optical imaging lens satisfies: 8.80 < DP3 / CT3 ≤ 9.65; where DP3 is the maximum diameter of the third lens and CT3 is the center thickness of the third lens.

[0015] In some embodiments of this application, the optical imaging lens satisfies: -0.87≤Tr5r8 / f34<-0.35; where Tr5r8 is the distance on the optical axis from the object side of the third lens to the image side of the fourth lens, and f34 is the combined focal length of the third lens and the fourth lens.

[0016] In some embodiments of this application, the optical imaging lens satisfies: 1.25 < D3s / T34 < 1.75; where D3s is the outer diameter of the object side of the third spacer element, and T34 is the air gap between the third lens and the fourth lens on the optical axis.

[0017] In some embodiments of this application, the optical imaging lens satisfies: 3.15 < d3s / (CT3×n3) < 3.60; where d3s is the inner diameter of the object side of the third spacer element, CT3 is the center thickness of the third lens, and n3 is the refractive index of the third lens.

[0018] In some embodiments of this application, the optical imaging lens satisfies: -2.10 < (d4s - d0m) / CT5 ≤ -0.75; where d4s is the inner diameter of the object side of the fourth spacer element, d0m is the inner diameter of the image side of the lens barrel, and CT5 is the center thickness of the fifth lens.

[0019] In some embodiments of this application, the optical imaging lens satisfies: 6.00≤f / (d0s-d0m)<10.85; where f is the effective focal length of the optical imaging lens, d0s is the inner diameter of the object side of the lens barrel, and d0m is the inner diameter of the image side of the lens barrel.

[0020] In summary, this application achieves a balance between the imaging brightness and viewing angle of a telephoto lens and obtains high resolution by constraining the conditional expression 15.40≤f / ImgH×fno≤16.00. However, within the compact space of mobile devices, telephoto lenses are prone to problems such as unreasonable optical path allocation and lens axial ratio misalignment. To address this, this invention designs the five-element optical imaging lens with a "three-front, two-rear" architecture. By constraining the axial length ratio of the front and rear lens groups and the axial distribution of the spacers with 1.95≤Tr1r6 / Tr7r10≤4.86 and 2.60<EP34 / EP23≤4.41, it ensures that each lens group has sufficient optical path space to achieve aberration modulation. Furthermore, a metasurface is designed for collaborative correction to control the light path and improve the stability of optical path propagation. At the same time, the second and third spacers have a sufficiently reasonable spacing to accommodate the edge structure area of ​​the second lens, consolidating assembly reliability. This allows the lens to achieve high imaging quality, a compact and miniaturized structure, and excellent mass production feasibility. Attached Figure Description

[0021] In the accompanying drawings, several embodiments of the present application are illustrated by way of example and not limitation, and the same or corresponding reference numerals denote the same or corresponding parts, wherein: Figure 1 This is a schematic diagram of the optical imaging lens in Example 1.

[0022] Figure 2 This is a schematic diagram of the optical imaging lens in Example 2.

[0023] Figure 3 This is a schematic diagram of the optical imaging lens in Example 3.

[0024] Figure 4A This is an on-axis chromatic aberration curve of the optical imaging lens according to Embodiments 1, 2 and 3 of this application.

[0025] Figure 4B The astigmatism curves of the optical imaging lenses according to Embodiments 1, 2 and 3 of this application are shown.

[0026] Figure 4C The distortion curves are for the optical imaging lenses in Embodiments 1, 2 and 3 of this application.

[0027] Figure 4D This is a magnification chromatic aberration curve of the optical imaging lens according to Embodiments 1, 2 and 3 of this application.

[0028] Figure 5 This is a schematic diagram of the optical imaging lens in Example 4.

[0029] Figure 6This is a schematic diagram of the optical imaging lens in Example 5.

[0030] Figure 7 This is a schematic diagram of the optical imaging lens in Example 6.

[0031] Figure 8A This is an on-axis chromatic aberration curve of the optical imaging lens according to Embodiments 4, 5 and 6 of this application.

[0032] Figure 8B The astigmatism curves of the optical imaging lenses according to Embodiments 4, 5 and 6 of this application are shown.

[0033] Figure 8C The distortion curves are for the optical imaging lenses in Embodiments 4, 5 and 6 of this application.

[0034] Figure 8D This is a magnification chromatic aberration curve of the optical imaging lens according to Embodiments 4, 5 and 6 of this application.

[0035] Figure 9 This is a schematic diagram of the optical imaging lens in Example 7.

[0036] Figure 10 This is a schematic diagram of the optical imaging lens in Example 8.

[0037] Figure 11 This is a schematic diagram of the optical imaging lens in Example 9.

[0038] Figure 12A This is an on-axis chromatic aberration curve of the optical imaging lens according to Embodiments 7, 8 and 9 of this application.

[0039] Figure 12B The astigmatism curves are shown for the optical imaging lenses in Embodiments 7, 8 and 9 of this application.

[0040] Figure 12C The distortion curves are for the optical imaging lenses in Embodiments 7, 8 and 9 of this application.

[0041] Figure 12D This is a magnification chromatic aberration curve of the optical imaging lens according to Embodiments 7, 8 and 9 of this application.

[0042] Figure 13 This is a schematic diagram of the parameters of the optical imaging lens of this application.

[0043] Figure 14This is a schematic diagram of the defocus curve of the optical imaging lens in Embodiment 1 of this application, which satisfies f / ImgH×fno=15.76, Tr1r6 / Tr7r10=4.86, and EP34 / EP23=4.15.

[0044] Figure 15 This is a schematic diagram of the defocus curve of the optical imaging lens in Embodiment 8 of this application, which satisfies f / ImgH×fno=15.76, Tr1r6 / Tr7r10=2.27, and EP34 / EP23=2.71.

[0045] Figure 16 This is a schematic diagram of the defocus curve of an optical imaging lens when f / ImgH×fno=15.76, Tr1r6 / Tr7r10=1.25, and EP34 / EP23=1.55.

[0046] Figure 17 This is a schematic diagram of the defocus curve of an optical imaging lens when f / ImgH×fno=15.76, Tr1r6 / Tr7r10=6.24, and EP34 / EP23=6.98.

[0047] Explanation of reference numerals in the attached drawings: E1, first lens; E2, second lens; E3, third lens; E4, fourth lens; E5, fifth lens; P0, lens barrel; P1, first spacer element; P2, second spacer element; P3, third spacer element; P3b, third auxiliary spacer element; P4, fourth spacer element. Detailed Implementation

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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 is 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 imaging plane is called the image-side surface. For the object-side surface, a positive R value indicates a convex surface, and a negative R value indicates a concave surface; for the image-side surface, a positive R value indicates a concave surface, and a negative R value indicates a convex surface.

[0052] 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.

[0053] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having a meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized sense, unless expressly so specified herein.

[0054] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. The following embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this application. It should be pointed out that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0055] Figure 13 The diagram shows the parameters of an optical imaging lens, which may include a lens barrel P0, a lens group, and multiple spacer elements.

[0056] This application provides an optical imaging lens, which includes a lens barrel P0, a lens group, and a plurality of spacer elements. The lens group is disposed within the lens barrel P0 and includes, along the optical axis from the object side to the image side, the following components in sequence: a first lens E1 with positive optical power, the object side of the first lens E1 being convex and made of glass; a second lens E2 with optical power, the object side of the second lens E2 being convex and the image side of the second lens E2 being concave; a third lens E3 with negative optical power, the object side of the third lens E3 being convex and the image side of the third lens E3 being concave; a fourth lens E4 with negative optical power, the object side of the fourth lens E4 being concave and the image side of the fourth lens E4 being convex; a fifth lens E5 with positive optical power; and at least one surface from the object side of the third lens E3 to the imaging plane being a metasurface with a subwavelength microstructure.

[0057] The plurality of spacer elements are disposed within the lens barrel P0, including: a first spacer element P1 located between the first lens E1 and the second lens E2, wherein the object-side surface of the first spacer element P1 contacts the image-side surface of the first lens E1; a second spacer element P2 located between the second lens E2 and the third lens E3, wherein the object-side surface of the second spacer element P2 contacts the image-side surface of the second lens E2; a third spacer element P3 located between the third lens E3 and the fourth lens E4, wherein the object-side surface of the third spacer element P3 contacts the image-side surface of the third lens E3; a third auxiliary spacer element P3b located between the third spacer element P3 and the fourth lens E4, wherein the object-side surface of the third auxiliary spacer element P3b contacts the image-side surface of the third spacer element P3; and a fourth spacer element P4 located between the fourth lens E4 and the fifth lens E5, wherein the object-side surface of the fourth spacer element P4 contacts the image-side surface of the fourth lens E4.

[0058] The optical imaging lens satisfies the following conditions: 15.40≤f / ImgH×fno≤16.00; 1.95≤Tr1r6 / Tr7r10≤4.86; 2.60<EP34 / EP23≤4.41; where f is the effective focal length of the optical imaging lens, ImgH is half the diagonal length of the effective pixel area on the imaging plane, fno is the relative aperture of the optical imaging lens, Tr1r6 is the distance on the optical axis from the object side of the first lens E1 to the image side of the third lens E3, Tr7r10 is the distance on the optical axis from the object side of the fourth lens E4 to the image side of the fifth lens E5, EP34 is the distance on the optical axis from the image side of the third spacer element P3 to the object side of the fourth spacer element P4, and EP23 is the distance on the optical axis from the image side of the second spacer element P2 to the object side of the third spacer element P3.

[0059] In summary, this application achieves a balance between the imaging brightness and viewing angle of a telephoto lens and obtains high resolution by constraining the conditional expression 15.40≤f / ImgH×fno≤16.00. However, within the compact space of mobile devices, telephoto lenses are prone to problems such as unreasonable optical path allocation and lens axial ratio misalignment. To address this, this invention designs the five-element optical imaging lens with a "three-front, two-rear" architecture. By constraining the axial length ratio of the front and rear lens groups and the axial distribution of the spacers with 1.95≤Tr1r6 / Tr7r10≤4.86 and 2.60<EP34 / EP23≤4.41, it ensures that each lens group has sufficient optical path space to achieve aberration modulation. Furthermore, a metasurface is designed for collaborative correction to control the light path and improve the stability of optical path propagation. At the same time, the second and third spacers have a sufficiently reasonable spacing to accommodate the edge structure area of ​​the second lens, consolidating assembly reliability. This allows the lens to achieve high imaging quality, a compact and miniaturized structure, and excellent mass production feasibility.

[0060] For example, Figure 14 and Figure 15 The figures are schematic diagrams of the defocus curves of the optical imaging lenses in Embodiment 1 and Embodiment 8 of this application, respectively. The mid-curves in the figures do not show excessive shift, and the optical imaging lenses in Embodiment 1 and Embodiment 8 have good imaging quality.

[0061] For example, Figure 16 In the optical imaging lens shown, which satisfies f / ImgH×fno=15.76, Tr1r6 / Tr7r10=1.25, and EP34 / EP23=1.55, the axial dimension ratio exceeds the lower limit of the formula. The axial space of the third and fourth lenses is insufficient, and there is no sufficient optical path for correcting field curvature. Therefore, the external field of view is severely discrete, and the imaging quality cannot meet the design requirements.

[0062] For example, Figure 17 In the optical imaging lens shown, which satisfies f / ImgH×fno=15.76, Tr1r6 / Tr7r10=6.24, EP34 / EP23=6.98, the axial dimension ratio exceeds the upper limit of the formula. The front lens group has an excessively large proportion, and the assembly space of the two rear lenses is compressed. This makes it difficult for the fourth and fifth lenses to complete the final aberration correction and optical path convergence tasks, which also leads to a decrease in resolution. The edge field curvature is severely discretized, resulting in deteriorated image quality and failure to meet design requirements.

[0063] According to some embodiments of this application, the metasurface includes a substrate and subwavelength microstructures formed on the substrate, wherein the substrate is a glass component or a plastic component.

[0064] This lens uses a metasurface, which, compared to a conventional five-element lens, can further reduce the overall height of the lens while maintaining comparable performance, thus achieving lens miniaturization.

[0065] According to some embodiments of this application, the plurality of spacer elements further includes: the optical imaging lens satisfies: 6.60 < f1 / (D1s-d1s) ≤ 8.80, where f1 is the effective focal length of the first lens E1, D1s is the outer diameter of the object side surface of the first spacer element P1, and d1s is the inner diameter of the object side surface of the first spacer element P1.

[0066] By constraining the ratio of the focal length of the first lens to the width of the object-side ring of the first spacer element, the optical performance and mechanical strength of the front end of the lens are balanced. This ensures that the first lens E1 has sufficient positive power to achieve efficient light focusing, while also preventing the radial dimension of the lens from increasing due to the excessive outer diameter of the spacer element, thus keeping the lens miniaturized.

[0067] According to some embodiments of this application, the plurality of spacer elements further include: the optical imaging lens satisfies: 2.30 < R1 / CT1 ≤ 3.02, 2.05 < EP01 / SAG11 < 2.80; wherein, R1 is the radius of curvature of the object side surface of the first lens E1, CT1 is the center thickness of the first lens E1, EP01 is the distance along the optical axis from the object side surface of the lens barrel P0 to the object side surface of the first spacer element P1, and SAG11 is the axial displacement from the intersection of the object side surface of the first lens E1 and the optical axis to the vertex of the optical effective radius of the object side surface of the first lens E1.

[0068] The above conditional constraints can constrain the appearance of the first lens structure and its axial positioning within the lens barrel, ensuring the feasibility of lens processing and structural strength, guaranteeing that the first lens has a suitable curvature, effectively converging light and reducing aberrations, while ensuring that the first lens installed in the lens barrel can be firmly fixed by the spacer element, and allowing the mechanical structure of the lens barrel to act as an effective light shield to prevent excessive stray light from entering, thereby improving image quality.

[0069] According to some embodiments of this application, the optical imaging lens satisfies: 2.45 < d1m / (D1m-d1m) < 4.75; where d1m is the inner diameter of the image-side surface of the first spacer element, and D1m is the outer diameter of the image-side surface of the first spacer element.

[0070] By constraining the ratio of the spacer element's inner diameter to the ring width using the above conditional formulas, a balance can be achieved between the optical performance and mechanical reliability of the optical imaging lens. If the ratio is too large, the light-transmitting aperture will be too large or the light-shielding wall will be too thin, failing to effectively block stray light diffracted or reflected from the lens edge, and the structural strength of the spacer element cannot be guaranteed, thus affecting assembly stability. If the ratio is too small, the light-transmitting aperture will be too small or the light-shielding wall will be too thick, easily leading to insufficient light transmission, blocking edge field of view light, and causing insufficient edge field of view brightness.

[0071] According to some embodiments of this application, the optical imaging lens satisfies: 0.95≤EP12 / (d1s-d2s)<2.35; where EP12 is the distance along the optical axis from the image side of the first spacer element P1 to the object side of the second spacer element P2, d1s is the inner diameter of the object side of the first spacer element P1, and d2s is the inner diameter of the object side of the second spacer element P2.

[0072] The above conditional formula constrains the ratio of the axial distance between the first and second spacer elements to the difference in their inner diameters. Through the stepped light-blocking system design of adjacent spacer elements, the axial distance and inner diameter difference can be used to effectively block stray light from the edges without physically squeezing the middle lens, thus achieving stray light suppression within a limited space.

[0073] According to some embodiments of this application, the optical imaging lens satisfies: 3.75 < (CT3 + T34) / (EP23 + CP3) ≤ 4.87; where EP23 is the distance along the optical axis from the image side of the second spacer element P2 to the object side of the third spacer element P3, CP3 is the maximum thickness of the third spacer element P3 along the optical axis, CT3 is the center thickness of the third lens E3, and T34 is the air gap between the third lens E3 and the fourth lens E4 on the optical axis.

[0074] By controlling the range of the above-mentioned conditions, the optical performance and mechanical structure of the middle section of the lens can be coordinated, ensuring that the third lens can be stably supported in the lens barrel and avoiding stress concentration problems caused by the compression between components.

[0075] According to some embodiments of this application, the optical imaging lens satisfies: 3.55 < (R4 + R5) / D2s ≤ 6.57; where R4 is the radius of curvature of the image side of the second lens E2, R5 is the radius of curvature of the object side of the third lens E3, and D2s is the outer diameter of the object side of the second spacer element P2.

[0076] When the ratio is within the above range, it helps to achieve a balance between the lens's optical performance and its size. Matching the curvature design of the two lenses with the outer diameter of the spacer element ensures that the aberrations between the two lenses are effectively corrected, and also makes the outer diameter of the spacer element reasonable, which is conducive to the miniaturization of the lens design.

[0077] According to some embodiments of this application, the optical imaging lens satisfies: 16.68≤L / (D0s-D0m)<24.75; where L is the maximum height of the lens barrel P0, D0s is the outer diameter of the object side of the lens barrel P0, and D0m is the outer diameter of the image side of the lens barrel P0.

[0078] The above conditional expression reflects the relationship between the slenderness of the lens barrel and its taper variation. Controlling this conditional expression helps the lens barrel to be easily demolded during injection molding and balances the overall structural strength and internal space utilization of the lens barrel.

[0079] According to some embodiments of this application, the optical imaging lens satisfies: -12.95≤f3 / (CP3+CP3b)≤-5.45; where f3 is the effective focal length of the third lens E3, CP3 is the maximum thickness of the third spacer element P3 along the optical axis, and CP3b is the maximum thickness of the third auxiliary spacer element P3b along the optical axis.

[0080] This condition defines the proportional relationship between the focal length of the third lens and the sum of the maximum thicknesses of the third spacer element and the third auxiliary spacer element along the optical column direction. When this ratio is within the aforementioned range, the negative optical power of the third lens and the thickness of the spacer element are well-matched: the negative optical power is large enough to effectively correct aberrations; the thickness of the spacer element is moderate enough to provide reliable structural support. This condition ensures that the third lens E3 fully utilizes its aberration correction function while obtaining stable mechanical support, which is beneficial for improving the lens's assembly accuracy and imaging stability.

[0081] According to some embodiments of this application, the optical imaging lens satisfies: 8.80 < DP3 / CT3 ≤ 9.65; where DP3 is the maximum diameter of the third lens E3 and CT3 is the center thickness of the third lens E3.

[0082] This ratio reflects the coordination between the radial and axial dimensions of the third lens, ensuring that the lens has good processing performance and structural strength while meeting the light transmission requirements.

[0083] According to some embodiments of this application, the optical imaging lens satisfies: -0.87≤Tr5r8 / f34<-0.35; where Tr5r8 is the distance on the optical axis from the object side of the third lens E3 to the image side of the fourth lens E4, and f34 is the combined focal length of the third lens E3 and the fourth lens E4.

[0084] The above conditional formula is one of the core designs of this optical imaging lens. In the "three front and two rear" lens architecture of this scheme, there is a large air gap between the third lens and the fourth lens. By controlling the above conditional formula, field curvature and astigmatism can be balanced to ensure that the incident angle of light is reasonable.

[0085] According to some embodiments of this application, the optical imaging lens satisfies: 1.25 < D3s / T34 < 1.75; where D3s is the outer diameter of the object side of the third spacer element P3, and T34 is the air distance between the third lens E3 and the fourth lens E4 on the optical axis.

[0086] By controlling the ratio of the outer diameter of the spacer element to the air gap, it is helpful to optimize the structural layout of the lens, achieve a balance between optical performance and size, effectively block internal stray light while ensuring the necessary light transmission, and ensure the stability of the structure.

[0087] According to some embodiments of this application, the optical imaging lens satisfies: 3.15 < d3s / (CT3×n3) < 3.60; where d3s is the inner diameter of the object side of the third spacer element P3, CT3 is the center thickness of the third lens E3, and n3 is the refractive index of the third lens E3.

[0088] This ratio constraint ensures that the aperture size matches the actual light refraction capability of the lens. It prevents stray light from the edges from being reflected by the inner wall of the spacer element and entering the subsequent optical path due to an excessively large inner diameter, reducing interference from ineffective light and ensuring the cleanliness of the mid-section optical path transmission; it also prevents the inner diameter from being too small, helping to ensure that the light emitted from the third lens can pass smoothly through subsequent lenses without being blocked by the mechanical structure, ensuring sufficient effective light transmission.

[0089] According to some embodiments of this application, the optical imaging lens satisfies: -2.10 < (d4s - d0m) / CT5 ≤ -0.75; where d4s is the inner diameter of the object side of the fourth spacer element P4, d0m is the inner diameter of the image side of the lens barrel P0, and CT5 is the center thickness of the fifth lens E5.

[0090] This ratio reflects the coordination between the structural features of the image-side end of the lens and the thickness of the fifth lens. When this ratio is within the above range, the thickness of the fifth lens matches well with the structural dimensions of the end of the lens barrel: the thickness of the fifth lens is moderate, which can effectively complete the final aberration correction and optical path convergence, without increasing the overall length of the lens due to excessive thickness; the inner diameter of the end of the lens barrel is reasonably designed, ensuring the assembly space for the fifth lens.

[0091] According to some embodiments of this application, the optical imaging lens satisfies: 6.00≤f / (d0s-d0m)<10.85; where f is the effective focal length of the optical imaging lens, d0s is the inner diameter of the object side of the lens barrel P0, and d0m is the inner diameter of the image side of the lens barrel P0.

[0092] By controlling the ratio of the lens focal length to the difference between the front and rear apertures of the lens barrel, the taper of the lens barrel is matched with the optical path of the lens, reducing the obstruction of light by the mechanical structure of the lens barrel, ensuring the illumination of light reaching the imaging surface, suppressing stray light, and improving image quality.

[0093] It should be noted that those skilled in the art should understand that, without departing from the technical solutions claimed in this application, the number of spacers constituting the optical imaging lens can be changed to obtain the various results and advantages described in this specification, and this application does not specifically limit this. For example, as needed, the optical imaging lens may also include other numbers of spacers than those described in the above embodiments.

[0094] The following describes in more detail some specific, non-limiting embodiments of the above-described embodiments of this application with reference to the accompanying drawings. For ease of description, in the following embodiments, OBJ represents the object plane (not shown in the figures), STO represents the aperture (not shown in the figures), S1 represents the object-side surface of the first lens E1, S2 represents the image-side surface of the first lens E1, S3 represents the object-side surface of the second lens E2, S4 represents the image-side surface of the second lens E2, S5 represents the object-side surface of the third lens E3, S6 represents the image-side surface of the third lens E3, S7 represents the object-side surface of the fourth lens E4, S8 represents the image-side surface of the fourth lens E4, S9 represents the object-side surface of the fifth lens E5, S10 represents the image-side surface of the fifth lens E5, S11 represents the object-side surface of the filter, S12 represents the image-side surface of the filter, and S13 represents the imaging plane.

[0095] Example 1 like Figure 1 As shown, in this embodiment, the optical imaging lens includes a lens barrel P0, a lens group assembled within the lens barrel P0, and a plurality of spacer elements.

[0096] The lens group is arranged sequentially along the optical axis from the object side to the image side as a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5. The first lens E1 has positive optical power, with a convex object side and a concave image side. The second lens E2 has positive optical power, with a convex object side and a concave image side. The third lens E3 has negative optical power, with a convex object side and a concave image side. The fourth lens E4 has negative optical power, with a concave object side and a convex image side. The fifth lens E5 has positive optical power, with a convex object side and a concave image side.

[0097] The plurality of spacers include: a first spacer P1 placed between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1; a second spacer P2 placed between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E2; a third spacer P3 placed between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3; a third auxiliary spacer P3b placed between the third spacer P3 and the fourth lens E4 and in contact with the image side of the third spacer P3; and a fourth spacer P4 placed between the fourth lens E4 and the fifth lens E5 and in contact with the image side of the fourth lens E4.

[0098] In this embodiment, the aperture STO of the optical imaging lens is located in front of the first lens E1.

[0099] In addition, Table 1 shows the basic optical parameters of the optical imaging lens of Embodiment 1, where the units of radius of curvature and thickness / distance are millimeters (mm).

[0100] Table 1

[0101] In this embodiment, the object-side surface and image-side surface of the first lens E1 are both spherical, and the object-side surface and image-side surface of any one of the second lens E2 to the fifth lens E5 are both aspherical. The surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula: ; Where x is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, and A24 that can be used for S3 to S10 in Example 1, where S3 to S10 are all aspherical surfaces.

[0102] Table 2

[0103] In this embodiment, the object-side surface S11 of the filter is a metasurface, which satisfies the following conditional expression: ; in, Let d represent the phase profiles, λ0 represent the diffraction order, λ0 represent the constructed wavelength, r represent the radial coordinate, and Ci represent the higher-order coefficients of the metasurface. The specific coefficient values ​​in the metasurface phase equation are shown in Table 3.

[0104] Table 3

[0105] Example 2 like Figure 2 As shown, in this embodiment, the optical imaging lens includes a lens barrel P0, a lens group assembled within the lens barrel P0, and a plurality of spacer elements.

[0106] The lens group is arranged sequentially along the optical axis from the object side to the image side as a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5. The plurality of spacers include: a first spacer P1 placed between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1; a second spacer P2 placed between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E2; a third spacer P3 placed between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3; a third auxiliary spacer P3b placed between the third spacer P3 and the fourth lens E4 and in contact with the image side of the third spacer P3; and a fourth spacer P4 placed between the fourth lens E4 and the fifth lens E5 and in contact with the image side of the fourth lens E4.

[0107] In this embodiment, the aperture STO of the optical imaging lens is located in front of the first lens E1.

[0108] It is worth noting that, compared with Embodiment 1 above, the optical imaging lens of Embodiment 2 has the same optical parameters. That is, the basic optical parameter table of the optical imaging lens of Embodiment 2 is the same as Table 1, the aspherical higher-order term coefficient table is the same as Table 2, and the metasurface phase equation coefficients are shown in Table 3. The difference between Embodiment 2 and Embodiment 1 above is that the dimensional values ​​of some structural parameters of the optical imaging lens are different. Specifically, the values ​​of various relevant structural parameters in Embodiment 2 and Embodiment 1 above are shown in Table 11.

[0109] Example 3 like Figure 3 As shown, in this embodiment, the optical imaging lens includes a lens barrel P0, a lens group assembled within the lens barrel P0, and a plurality of spacer elements.

[0110] The lens group consists of a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5 arranged sequentially along the optical axis from the object side to the image side.

[0111] The plurality of spacers include: a first spacer P1 placed between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1; a second spacer P2 placed between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E2; a third spacer P3 placed between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3; a third auxiliary spacer P3b placed between the third spacer P3 and the fourth lens E4 and in contact with the image side of the third spacer P3; and a fourth spacer P4 placed between the fourth lens E4 and the fifth lens E5 and in contact with the image side of the fourth lens E4.

[0112] In this embodiment, the aperture STO of the optical imaging lens is located in front of the first lens E1.

[0113] It is worth noting that, compared with Embodiment 1 above, the optical imaging lens of Embodiment 3 has the same optical parameters. That is, the basic optical parameter table of the optical imaging lens of Embodiment 3 is the same as Table 1, the aspherical higher-order term coefficient table is the same as Table 2, and the metasurface phase equation coefficients are shown in Table 3. The difference between Embodiment 3 and Embodiment 1 above is that the dimensional values ​​of some structural parameters in the optical imaging lens are different. Specifically, the values ​​of various relevant structural parameters in Embodiment 3 and Embodiment 1 above are shown in Table 11.

[0114] The on-axis chromatic aberration curves of the optical imaging lenses in Examples 1, 2, and 3 are as follows: Figure 4A As shown, this indicates the deviation of the focal point of light rays of different wavelengths (656nm, 610nm, 555nm, 510nm, 486nm, 435nm) after passing through the imaging system; the astigmatism curves of the optical imaging lenses in Embodiments 1, 2, and 3 are shown below. Figure 4B As shown, it represents the curvature of the meridional image plane and the sagittal image plane; the distortion curves of the optical imaging lenses in Embodiments 1, 2, and 3 are as follows. Figure 4C As shown, it represents the distortion magnitude corresponding to different image heights. The magnification chromatic aberration curves of the optical imaging lenses in Examples 1, 2, and 3 are shown below. Figure 4D As shown, this represents the deviation in image height on the image plane after light passes through the imaging system. According to... Figures 4A-4D It can be seen that the optical imaging lenses in Embodiment 1, Embodiment 2 and Embodiment 3 can all achieve good imaging quality.

[0115] Example 4 like Figure 5 As shown, in this embodiment, the optical imaging lens includes a lens barrel P0, a lens group assembled within the lens barrel P0, and a plurality of spacer elements.

[0116] The lens group is arranged sequentially along the optical axis from the object side to the image side as a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5. The first lens E1 has positive optical power, and both its object-side and image-side surfaces are convex. The second lens E2 has negative optical power, and both its object-side and image-side surfaces are concave. The third lens E3 has negative optical power, and both its object-side and image-side surfaces are convex. The fourth lens E4 has negative optical power, and both its object-side and image-side surfaces are concave. The fifth lens E5 has positive optical power, and both its object-side and image-side surfaces are convex.

[0117] The plurality of spacers include: a first spacer P1 placed between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1; a second spacer P2 placed between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E2; a third spacer P3 placed between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3; a third auxiliary spacer P3b placed between the third spacer P3 and the fourth lens E4 and in contact with the image side of the third spacer P3; and a fourth spacer P4 placed between the fourth lens E4 and the fifth lens E5 and in contact with the image side of the fourth lens E4.

[0118] In this embodiment, the aperture STO of the optical imaging lens is located in front of the first lens E1.

[0119] In addition, Table 4 shows the basic optical parameters of the optical imaging lens of Embodiment 4, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0120] Table 4

[0121] In this embodiment, the object-side surface and image-side surface of the first lens E1 are both spherical, and the object-side surface and image-side surface of any one of the second lens E2 to the fifth lens E5 are both aspherical. The surface shape x of each aspherical lens can be defined using, but is not limited to, the aspherical formula in Embodiment 1.

[0122] Table 5 below gives the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, and A24 that can be used in S3 to S10 in Example 4. S3 to S10 are all aspherical.

[0123] Table 5

[0124] In this embodiment, the object-side surface S11 of the filter is a metasurface, and the shape of this metasurface satisfies the constraints of the metasurface phase equation in Embodiment 1. Specifically, the phase equation coefficients of this metasurface are shown in Table 6 below.

[0125] Table 6

[0126] Example 5 like Figure 6 As shown, in this embodiment, the optical imaging lens includes a lens barrel P0, a lens group assembled within the lens barrel P0, and a plurality of spacer elements.

[0127] The lens group consists of a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5 arranged sequentially along the optical axis from the object side to the image side.

[0128] The plurality of spacers include: a first spacer P1 placed between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1; a second spacer P2 placed between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E2; a third spacer P3 placed between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3; a third auxiliary spacer P3b placed between the third spacer P3 and the fourth lens E4 and in contact with the image side of the third spacer P3; and a fourth spacer P4 placed between the fourth lens E4 and the fifth lens E5 and in contact with the image side of the fourth lens E4.

[0129] In this embodiment, the aperture STO of the optical imaging lens is located in front of the first lens E1.

[0130] It is worth noting that, compared with Embodiment 4 above, the optical imaging lens of Embodiment 5 has the same optical parameters. That is, the basic optical parameter table of the optical imaging lens of Embodiment 5 is the same as Table 4, the aspherical higher-order term coefficient table is the same as Table 5, and the metasurface phase equation coefficients are shown in Table 6. The difference between Embodiment 5 and Embodiment 4 above is that the dimensional values ​​of some structural parameters in the optical imaging lens are different. Specifically, the values ​​of various relevant structural parameters in Embodiment 5 and Embodiment 4 above are shown in Table 11.

[0131] Example 6 like Figure 7 As shown, in this embodiment, the optical imaging lens includes a lens barrel P0, a lens group assembled within the lens barrel P0, and a plurality of spacer elements.

[0132] The lens group consists of a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5 arranged sequentially along the optical axis from the object side to the image side.

[0133] The plurality of spacers include: a first spacer P1 placed between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1; a second spacer P2 placed between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E2; a third spacer P3 placed between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3; a third auxiliary spacer P3b placed between the third spacer P3 and the fourth lens E4 and in contact with the image side of the third spacer P3; and a fourth spacer P4 placed between the fourth lens E4 and the fifth lens E5 and in contact with the image side of the fourth lens E4.

[0134] In this embodiment, the aperture STO of the optical imaging lens is located in front of the first lens E1.

[0135] It is worth noting that, compared with Embodiment 4 above, the optical imaging lens of Embodiment 6 has the same optical parameters. That is, the basic optical parameter table of the optical imaging lens of Embodiment 6 is the same as Table 4, the aspherical higher-order term coefficient table is the same as Table 5, and the metasurface phase equation coefficients are shown in Table 6. The difference between Embodiment 6 and Embodiment 4 above is that the dimensional values ​​of some structural parameters in the optical imaging lens are different. Specifically, the values ​​of various relevant structural parameters in Embodiment 6 and Embodiment 4 above are shown in Table 11.

[0136] The on-axis chromatic aberration curves of the optical imaging lenses in Examples 4, 5, and 6 are as follows: Figure 8A As shown, this indicates the deviation of the focal point of light rays of different wavelengths (656nm, 610nm, 555nm, 510nm, 486nm, 435nm) after passing through the imaging system; the astigmatism curves of the optical imaging lenses in Examples 4, 5, and 6 are shown below. Figure 8B As shown, it represents the curvature of the meridional image plane and the sagittal image plane; the distortion curves of the optical imaging lenses in Embodiments 4, 5, and 6 are as follows. Figure 8C As shown, it represents the distortion magnitude corresponding to different image heights. The magnification chromatic aberration curves of the optical imaging lenses in Examples 4, 5, and 6 are shown below. Figure 8D As shown, this represents the deviation in image height on the image plane after light passes through the imaging system. According to... Figures 8A-8D It can be seen that the optical imaging lenses in Embodiments 4, 5 and 6 can all achieve good imaging quality.

[0137] Example 7 like Figure 9 As shown, in this embodiment, the optical imaging lens includes a lens barrel P0, a lens group assembled within the lens barrel P0, and a plurality of spacer elements.

[0138] The lens group is arranged sequentially along the optical axis from the object side to the image side as a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5. The first lens E1 has positive optical power, with a convex object side and a concave image side. The second lens E2 has positive optical power, with a convex object side and a concave image side. The third lens E3 has negative optical power, with a convex object side and a concave image side. The fourth lens E4 has negative optical power, with a concave object side and a convex image side. The fifth lens E5 has positive optical power, with a concave object side and a convex image side.

[0139] The plurality of spacers include: a first spacer P1 placed between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1; a second spacer P2 placed between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E2; a third spacer P3 placed between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3; a third auxiliary spacer P3b placed between the third spacer P3 and the fourth lens E4 and in contact with the image side of the third spacer P3; and a fourth spacer P4 placed between the fourth lens E4 and the fifth lens E5 and in contact with the image side of the fourth lens E4.

[0140] In this embodiment, the aperture STO of the optical imaging lens is located in front of the first lens E1.

[0141] In addition, Table 7 shows the basic optical parameters of the optical imaging lens of Embodiment 7, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0142] Table 7

[0143] In this embodiment, the object-side surface and image-side surface of the first lens E1 are both spherical, the object-side surface and image-side surface of any one of the second lens E2, the fourth lens E4 and the fifth lens E5 are both aspherical, and the image-side surface of the third lens E3 is aspherical. The surface shape x of each aspherical lens can be defined using, but is not limited to, the aspherical formula in Embodiment 1.

[0144] Table 8 below gives the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, and A24 that can be used in S3, S4, S6 to S10 in Example 4. S3, S4 and S6 to S10 are all aspherical.

[0145] Table 8

[0146] In this embodiment, the object-side surface S5 of the third lens E3 is a metasurface, and the shape of this metasurface satisfies the constraints of the metasurface phase equation in Embodiment 1. Specifically, the phase equation coefficients of this metasurface are shown in Table 9 below.

[0147] Table 9

[0148] Example 8 like Figure 10As shown, in this embodiment, the optical imaging lens includes a lens barrel P0, a lens group assembled within the lens barrel P0, and a plurality of spacer elements.

[0149] The lens group consists of a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5 arranged sequentially along the optical axis from the object side to the image side.

[0150] The plurality of spacers include: a first spacer P1 placed between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1; a second spacer P2 placed between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E2; a third spacer P3 placed between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3; a third auxiliary spacer P3b placed between the third spacer P3 and the fourth lens E4 and in contact with the image side of the third spacer P3; and a fourth spacer P4 placed between the fourth lens E4 and the fifth lens E5 and in contact with the image side of the fourth lens E4.

[0151] In this embodiment, the aperture STO of the optical imaging lens is located in front of the first lens E1.

[0152] It is worth noting that, compared with Embodiment 7 above, the optical imaging lens of Embodiment 8 has the same optical parameters. That is, the basic optical parameter table of the optical imaging lens of Embodiment 8 is the same as Table 7, the aspherical higher-order term coefficient table is the same as Table 8, and the metasurface phase equation coefficients are shown in Table 9. The difference between Embodiment 8 and Embodiment 7 above is that the dimensional values ​​of some structural parameters in the optical imaging lens are different. Specifically, the values ​​of various relevant structural parameters in Embodiment 8 and Embodiment 7 above are shown in Table 11.

[0153] Example 9 like Figure 11 As shown, in this embodiment, the optical imaging lens includes a lens barrel P0, a lens group assembled within the lens barrel P0, and a plurality of spacer elements.

[0154] The lens group consists of a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, and a fifth lens E5 arranged sequentially along the optical axis from the object side to the image side.

[0155] The plurality of spacers include: a first spacer P1 placed between the first lens E1 and the second lens E2 and in contact with the image side of the first lens E1; a second spacer P2 placed between the second lens E2 and the third lens E3 and in contact with the image side of the second lens E2; a third spacer P3 placed between the third lens E3 and the fourth lens E4 and in contact with the image side of the third lens E3; a third auxiliary spacer P3b placed between the third spacer P3 and the fourth lens E4 and in contact with the image side of the third spacer P3; and a fourth spacer P4 placed between the fourth lens E4 and the fifth lens E5 and in contact with the image side of the fourth lens E4.

[0156] In this embodiment, the aperture STO of the optical imaging lens is located in front of the first lens E1.

[0157] It is worth noting that, compared with Embodiment 7 above, the optical imaging lens of Embodiment 9 has the same optical parameters. That is, the basic optical parameter table of the optical imaging lens of Embodiment 9 is the same as Table 7, the aspherical higher-order term coefficient table is the same as Table 8, and the metasurface phase equation coefficients are shown in Table 9. The difference between Embodiment 9 and Embodiment 7 above is that the dimensional values ​​of some structural parameters in the optical imaging lens are different. Specifically, the values ​​of various relevant structural parameters in Embodiment 9 and Embodiment 7 above are shown in Table 11.

[0158] The on-axis chromatic aberration curves of the optical imaging lenses in Examples 7, 8, and 9 are as follows: Figure 12A As shown, this indicates the deviation of the focal point of light rays of different wavelengths (656nm, 610nm, 555nm, 510nm, 486nm, 435nm) after passing through the imaging system; the astigmatism curves of the optical imaging lenses in Embodiments 7, 8, and 9 are shown below. Figure 12B As shown, it represents the curvature of the meridional image plane and the sagittal image plane; the distortion curves of the optical imaging lenses in Embodiments 7, 8, and 9 are as follows. Figure 12C As shown, it represents the distortion magnitude corresponding to different image heights. The magnification chromatic aberration curves of the optical imaging lenses in Examples 7, 8, and 9 are shown below. Figure 12D As shown, this represents the deviation in image height on the image plane after light passes through the imaging system. According to... Figures 12A-12D It can be seen that the optical imaging lenses in Embodiments 7, 8 and 9 can all achieve good imaging quality.

[0159] In summary, the optical parameters of the optical imaging lenses in Examples 1 to 9 are shown in Table 10 below.

[0160] Table 10

[0161] In summary, the structural parameters of the optical imaging lenses in Examples 1 to 9 are shown in Table 11 below, and the unit of each parameter is millimeters (mm).

[0162] Table 11

[0163] In summary, the relationships satisfied by the optical imaging lenses in Examples 1 to 9 are shown in Table 12 below.

[0164] Table 12

[0165] 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 imaging lens, characterized in that, The optical imaging lens includes a lens barrel, a lens group, and multiple spacer elements; The lens group is placed inside the lens barrel, and the number of lenses with optical power in the lens group is five. The lens group includes, in sequence from the object side to the image side along the optical axis: A first lens having positive optical power, wherein the object side of the first lens is convex, and the first lens is made of glass; A second lens with optical power, wherein the object side of the second lens is convex and the image side of the second lens is concave; A third lens with negative optical power, wherein the object-side surface of the third lens is convex and the image-side surface of the third lens is concave; A fourth lens with negative optical power, wherein the object side of the fourth lens is concave and the image side of the fourth lens is convex; A fifth lens with positive optical power; At least one surface from the object side of the third lens to the imaging plane is a metasurface; The plurality of spacer elements are disposed within the lens barrel, including: a second spacer element located between the second lens and the third lens, wherein the object-side surface of the second spacer element contacts the image-side surface of the second lens; a third spacer element located between the third lens and the fourth lens, wherein the object-side surface of the third spacer element contacts the image-side surface of the third lens; and a fourth spacer element located between the fourth lens and the fifth lens, wherein the object-side surface of the fourth spacer element contacts the image-side surface of the fourth lens. The optical imaging lens satisfies the following condition: 15.40≤f / ImgH×fno≤16.00; 1.95≤Tr1r6 / Tr7r10≤4.86; 2.60 < EP34 / EP23 ≤ 4.41; Wherein, f is the effective focal length of the optical imaging lens, ImgH is half the diagonal length of the effective pixel area on the imaging plane, fno is the relative aperture of the optical imaging lens, Tr1r6 is the distance on the optical axis from the object side of the first lens to the image side of the third lens, Tr7r10 is the distance on the optical axis from the object side of the fourth lens to the image side of the fifth lens, EP34 is the distance on the optical axis from the image side of the third spacer element to the object side of the fourth spacer element, and EP23 is the distance on the optical axis from the image side of the second spacer element to the object side of the third spacer element.

2. The optical imaging lens according to claim 1, characterized in that, The metasurface includes a substrate and subwavelength microstructures formed on the substrate, wherein the substrate is a glass component or a plastic component.

3. The optical imaging lens according to claim 1 or 2, characterized in that, The plurality of spacers further includes: a first spacer located between the first lens and the second lens, wherein the object-side surface of the first spacer is in contact with the image-side surface of the first lens; the optical imaging lens satisfies: 6.60 < f1 / (D1s-d1s) ≤ 8.80, where f1 is the effective focal length of the first lens, D1s is the outer diameter of the object-side surface of the first spacer, and d1s is the inner diameter of the object-side surface of the first spacer.

4. The optical imaging lens according to claim 1 or 2, characterized in that, The plurality of spacers further includes: a first spacer located between the first lens and the second lens, wherein the object-side surface of the first spacer is in contact with the image-side surface of the first lens; the optical imaging lens satisfies: 2.30 < R1 / CT1 ≤ 3.02, 2.05 < EP01 / SAG11 < 2.80; wherein R1 is the radius of curvature of the object-side surface of the first lens, CT1 is the center thickness of the first lens, EP01 is the distance along the optical axis from the object-side surface of the lens barrel to the object-side surface of the first spacer, and SAG11 is the axial displacement from the intersection of the object-side surface of the first lens and the optical axis to the vertex of the optical effective radius of the object-side surface of the first lens.

5. The optical imaging lens according to claim 1 or 2, characterized in that, The plurality of spacers further includes: a first spacer located between the first lens and the second lens, wherein the object side of the first spacer is in contact with the image side of the first lens; the optical imaging lens satisfies: 2.45 < d1m / (D1m-d1m) < 4.75; wherein d1m is the inner diameter of the image side of the first spacer and D1m is the outer diameter of the image side of the first spacer.

6. The optical imaging lens according to claim 1 or 2, characterized in that, The plurality of spacers further includes: a first spacer located between the first lens and the second lens, wherein the object-side surface of the first spacer is in contact with the image-side surface of the first lens; the optical imaging lens satisfies: 0.95≤EP12 / (d1s-d2s)<2.35; wherein EP12 is the distance along the optical axis from the image-side surface of the first spacer to the object-side surface of the second spacer, d1s is the inner diameter of the object-side surface of the first spacer, and d2s is the inner diameter of the object-side surface of the second spacer.

7. The optical imaging lens according to claim 1 or 2, characterized in that, The optical imaging lens satisfies: 3.75 < (CT3 + T34) / (EP23 + CP3) ≤ 4.87; where EP23 is the distance along the optical axis from the image side of the second spacer element to the object side of the third spacer element, CP3 is the maximum thickness of the third spacer element along the optical axis, CT3 is the center thickness of the third lens, and T34 is the air gap between the third lens and the fourth lens along the optical axis.

8. The optical imaging lens according to claim 1 or 2, characterized in that, The optical imaging lens satisfies: 3.55 < (R4 + R5) / D2s ≤ 6.57; where R4 is the radius of curvature of the image side of the second lens, R5 is the radius of curvature of the object side of the third lens, and D2s is the outer diameter of the object side of the second spacer element.

9. The optical imaging lens according to claim 1 or 2, characterized in that, The optical imaging lens satisfies: 16.68≤L / (D0s-D0m)<24.75; where L is the maximum height of the lens barrel, D0s is the outer diameter of the object side of the lens barrel, and D0m is the outer diameter of the image side of the lens barrel.

10. The optical imaging lens according to claim 1 or 2, characterized in that, The plurality of spacers also includes a third auxiliary spacer located between the third spacer and the fourth lens. The object side of the third auxiliary spacer is in contact with the image side of the third spacer. The optical imaging lens satisfies: -12.95≤f3 / (CP3+CP3b)≤-5.45; where f3 is the effective focal length of the third lens, CP3 is the maximum thickness of the third spacer along the optical axis, and CP3b is the maximum thickness of the third auxiliary spacer along the optical axis.

11. The optical imaging lens according to claim 1 or 2, characterized in that, The optical imaging lens satisfies the following condition: 8.80 < DP3 / CT3 ≤ 9.65; where DP3 is the maximum diameter of the third lens and CT3 is the center thickness of the third lens.

12. The optical imaging lens according to claim 1 or 2, characterized in that, The optical imaging lens satisfies: -0.87≤Tr5r8 / f34<-0.35; where Tr5r8 is the distance on the optical axis from the object side of the third lens to the image side of the fourth lens, and f34 is the combined focal length of the third lens and the fourth lens.

13. The optical imaging lens according to claim 1 or 2, characterized in that, The optical imaging lens satisfies: 1.25 < D3s / T34 < 1.75; where D3s is the outer diameter of the object side of the third spacer element, and T34 is the air gap between the third lens and the fourth lens on the optical axis.

14. The optical imaging lens according to claim 1 or 2, characterized in that, The optical imaging lens satisfies: 3.15 < d3s / (CT3×n3) < 3.60; where d3s is the inner diameter of the object side of the third spacer element, CT3 is the center thickness of the third lens, and n3 is the refractive index of the third lens.

15. The optical imaging lens according to claim 1 or 2, characterized in that, The optical imaging lens satisfies: -2.10 < (d4s - d0m) / CT5 ≤ -0.75; where d4s is the inner diameter of the object side of the fourth spacer element, d0m is the inner diameter of the image side of the lens barrel, and CT5 is the center thickness of the fifth lens.

16. The optical imaging lens according to claim 1 or 2, characterized in that, The optical imaging lens satisfies: 6.00≤f / (d0s-d0m)<10.85; where f is the effective focal length of the optical imaging lens, d0s is the inner diameter of the object side of the lens barrel, and d0m is the inner diameter of the image side of the lens barrel.

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