Optical imaging lens

Abstract

The application discloses an optical imaging lens, which comprises an imaging lens group sequentially comprising a first lens with negative focal power, a second lens with positive focal power, a third lens with positive focal power, a fourth lens with positive focal power, a fifth lens with negative focal power, a sixth lens with positive focal power, a seventh lens with positive focal power and an eighth lens with negative focal power along an optical axis from an object side to an image side, wherein the eighth lens has a negative curvature radius on the object side; a plurality of spacer elements, comprising a fourth spacer element arranged between the fourth lens and the fifth lens and in contact with the image side of the fourth lens, and a seventh spacer element arranged between the seventh lens and the eighth lens and in contact with the image side of the seventh lens; the curvature radius R6 of the image side of the third lens, the curvature radius R8 of the image side of the fourth lens, the inner diameter d4m of the image side of the fourth spacer element and the inner diameter d7m of the image side of the seventh spacer element satisfy: -22.0 < (R6+R8) / (d4m+d7m) < -3.6.

Description

Technical Field

[0001] This application relates to the field of optical components, and more specifically, to an optical imaging lens. Background Technology

[0002] With the continuous innovation and development of optical imaging lens technology, optical imaging lenses are increasingly trending towards smaller size, larger aperture, and longer focal length. A telephoto lens refers to a photographic lens with a focal length longer than a standard lens. It can be said that every mobile phone brand has invested a great deal of effort in telephoto cameras, and has been constantly experimenting with various combinations for many years. Initially, manufacturers tried to increase the focal length by making the lens protrude, which is one of the reasons why more and more mobile phone lenses are now protruding. However, there are limits to lens protrusion, but people still want mobile phones to shoot further. This is where the periscope telephoto lens solution came in. However, currently, periscope telephoto lenses still face problems such as large size, poor assembly stability, and excessive stray light. Therefore, how to design a periscope optical imaging lens that combines small size, large aperture, long focal length, and good image quality has become a challenge and problem that the lens industry must challenge and solve. Summary of the Invention

[0003] This application provides an optical imaging lens comprising: an imaging lens group, which sequentially includes, along the optical axis from the object side to the image side: a first lens having negative optical power; a second lens having positive optical power; a third lens having positive optical power; a fourth lens having positive optical power; a fifth lens having negative optical power; a sixth lens having positive optical power; a seventh lens having positive optical power; and an eighth lens having negative optical power, the radius of curvature of its object side being negative; and a plurality of spacer elements, including a fourth spacer element disposed between the fourth and fifth lenses and in contact with the image side of the fourth lens, and a seventh spacer element disposed between the seventh and eighth lenses and in contact with the image side of the seventh lens; wherein the radius of curvature R6 of the image side of the third lens, the radius of curvature R8 of the image side of the fourth lens, the inner diameter d4m of the image side of the fourth spacer element, and the inner diameter d7m of the image side of the seventh spacer element satisfy: -22.0 < (R6 + R8) / (d4m + d7m) < -3.6.

[0004] In one embodiment, the optical imaging lens further includes a lens barrel for accommodating the imaging lens group and a plurality of spacers. The plurality of spacers also includes a front end spacer disposed between the lens barrel and the first lens and in contact with the object side of the first lens. The inner diameter d1as of the object side of the front end spacer, the outer diameter D7m of the image side of the seventh spacer, the inner diameter d7s of the object side of the seventh spacer, the outer diameter D7s of the object side of the seventh spacer, and the center thickness CT8 of the eighth lens on the optical axis satisfy: 5.0 < (d1as + d7s) / D7m × (D7s / CT8) < 9.0.

[0005] In one embodiment, the optical imaging lens further includes a lens barrel for accommodating the imaging lens group and a plurality of spacers. The plurality of spacers also includes a front end spacer disposed between the lens barrel and the first lens and in contact with the object side of the first lens. The outer diameter D1am of the image side of the front end spacer, the outer diameter D7m of the image side of the seventh spacer, the inner diameter d4m of the image side of the fourth spacer, the inner diameter d7m of the image side of the seventh spacer, and the center thickness CT7 of the seventh lens on the optical axis satisfy: 2.5 < (D1am + D7m - d4m - d7m) / CT7 < 6.5.

[0006] In one embodiment, the radius of curvature R9 of the object side of the fifth lens, the outer diameter D4m of the image side of the fourth spacer element, the outer diameter D7s of the object side of the seventh spacer element, and the air gap T78 between the seventh and eighth lenses on the optical axis satisfy: -61.0 < (R9 + D4m + D7s) / T78 < 0.

[0007] In one embodiment, the outer diameter D4s of the object side of the fourth spacer element, the outer diameter D7m of the image side of the seventh spacer element, the maximum thickness CP4 of the fourth spacer element along the optical axis, and half of the maximum field of view of the optical imaging lens, Semi-FOV, satisfy: 0 < (D4s + D7m) × tan(Semi-FOV) / CP4 < 70.0.

[0008] In one embodiment, the sum of the air gaps on the optical axis between any two adjacent lenses from the first to the eighth lens, ∑AT, and the maximum thickness CP7 of the seventh spacer element along the optical axis satisfy: 0 < ∑AT / (CP7 × 10) < 26.0.

[0009] In one embodiment, the optical imaging lens further includes a lens barrel for housing the imaging lens group and multiple spacer elements, wherein the inner diameter d03m of the image-side end of the lens barrel closest to the image side satisfies -5.0° with the effective focal length f8 of the eighth lens. <f8 / d03m<0。

[0010] In one embodiment, the optical imaging lens further includes a lens barrel for accommodating the imaging lens group and a plurality of spacer elements. The lens barrel includes a first lens barrel, a second lens barrel, and a third lens barrel in sequence from the object side to the image side along the optical axis. The maximum height L1 of the first lens barrel along the optical axis, the maximum height L2 of the second lens barrel along the optical axis, the maximum height L3 of the third lens barrel along the optical axis, the sum of the center thicknesses of the first to eighth lenses along the optical axis ∑CT, and the sum of the air gaps between any two adjacent lenses in the first to eighth lenses along the optical axis ∑AT satisfy: 3.0 < (L1 + L2 + L3) / (∑CT - ∑AT) < 7.0.

[0011] In one embodiment, the optical imaging lens further includes a lens barrel for accommodating the imaging lens group and a plurality of spacer elements, wherein the radius of curvature R16 of the image side of the eighth lens, the radius of curvature R12 of the image side of the sixth lens, and the outer diameter D03m of the image side end of the lens barrel closest to the image side satisfy: -5.5 < (R16-R12) / D03m < 1.0.

[0012] In one embodiment, the optical imaging lens further includes a prism disposed between the first lens and the object side.

[0013] In one embodiment, at least one of the first to eighth lenses is a glass lens.

[0014] In one embodiment, the plurality of spacer elements is at least six spacer elements.

[0015] The optical imaging lens provided in this application consists of multiple lenses and multiple spacer elements. The combination of multiple lenses can ensure the imaging effect of the optical imaging lens and make its imaging effect meet more requirements. At the same time, the optical imaging lens of this application incorporates multiple spacer elements to improve the strength of the optical imaging lens itself and reduce stray light. The optical imaging lens of this application has at least one beneficial effect, such as long focal length, low chromatic aberration, thinness, high image quality, less stray light, good assembly stability, and weak ghosting. Attached Figure Description

[0016] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0017] Figure 1A A structural layout diagram and schematic diagram of some parameters of an optical imaging lens according to this application are shown;

[0018] Figure 1B A schematic diagram of a spacing element for reducing stray light in an optical imaging lens according to this application is shown;

[0019] Figure 2A and Figure 2BA schematic diagram of the structure of an optical imaging lens according to Embodiment 1 of this application is shown;

[0020] Figures 3A to 3D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens according to Embodiment 1 of this application are shown respectively.

[0021] Figure 4A and Figure 4B A schematic diagram of the structure of an optical imaging lens according to Embodiment 2 of this application is shown;

[0022] Figures 5A to 5D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens according to Embodiment 2 of this application are shown respectively.

[0023] Figure 6A and Figure 6B A schematic diagram of the structure of an optical imaging lens according to Embodiment 3 of this application is shown; and

[0024] Figures 7A to 7D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging lens according to Embodiment 3 of this application are shown. Detailed Implementation

[0025] 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.

[0026] 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.

[0027] 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.

[0028] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0029] 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.

[0030] 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.

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The application will now be described in detail with reference to the accompanying drawings and embodiments. Figure 1A This diagram illustrates the structural layout and schematic diagram of some parameters of an optical imaging lens according to this application. Those skilled in the art will understand that some parameters frequently used in the art, such as the radius of curvature R6 of the image-side surface of the third lens, are not shown in the diagram. Figure 1A As shown in the figure, Figure 1A The following are merely exemplary parameters of the lens, barrel, and spacer elements of an optical imaging lens according to this application, in order to better understand the present invention.

[0032] The features, principles and other aspects of this application are described in detail below.

[0033] like Figure 1AAs shown, an optical imaging lens according to an exemplary embodiment of this application includes an imaging lens group and multiple spacer elements. The imaging lens group, along the optical axis from the object side to the image side, sequentially includes: a first lens E1 with negative optical power, a second lens E2 with positive optical power, a third lens E3 with positive optical power, a fourth lens E4 with positive optical power, a fifth lens E5 with negative optical power, a sixth lens E6 with positive optical power, a seventh lens E7 with positive optical power, and an eighth lens E8 with negative optical power. The radius of curvature of the object side surface of the eighth lens E8 is negative. Any two adjacent lenses from the first lens E1 to the eighth lens E8 may have a spacer distance. By rationally allocating the positive and negative optical powers of each lens in the optical imaging lens, the low-order aberrations of the optical imaging lens can be effectively balanced and controlled, tolerance sensitivity can be reduced, and the miniaturization of the optical imaging lens can be maintained. Simultaneously, by rationally utilizing limited space, the optical imaging lens can have the characteristics of a large aperture and a long focal length.

[0034] In an exemplary implementation, such as Figure 1A As shown, the plurality of spacers include a fourth spacer P4 which is placed between the fourth lens E4 and the fifth lens E5 and in contact with the image side of the fourth lens E4, and a seventh spacer P7 which is placed between the seventh lens E7 and the eighth lens E8 and in contact with the image side of the seventh lens E7.

[0035] In an exemplary embodiment, the optical imaging lens includes at least six spacer elements, which help the optical imaging lens intercept excess reflective light paths and reduce stray light and ghosting.

[0036] Figure 1B A schematic diagram illustrating the reduction of stray light by a spacer element in an optical imaging lens according to this application is shown. A beam of light is blocked at the first spacer element P4 and does not enter the rear lens. The dashed line represents the path of this light beam entering the rear lens if it were not blocked. It should be understood that the diagram is provided for clarity of structure and labeling. Figure 1B The example only uses the fourth spacer element P4 to eliminate stray light; the other spacers also have the function of eliminating stray light, and the principle of eliminating stray light is the same as that of the fourth spacer element. Therefore, the optical imaging lens of this application can block non-imaging optical paths, reduce stray light, and ensure the imaging effect of the lens by incorporating multiple spacers.

[0037] In an exemplary implementation, such as Figure 1A and Figure 1B As shown, the optical imaging lens also includes a lens barrel for accommodating the imaging lens group and multiple spacer elements. The lens barrel can be a segmented lens barrel, which includes a first lens barrel P01, a second lens barrel P02 and a third lens barrel P03 in sequence from the object side to the image side along the optical axis.

[0038] In an exemplary implementation, such as Figure 1B As shown, the optical imaging lens also includes a prism P disposed between the first lens and the object side. The prism P enables the optical imaging lens to realize the reflection of the light path, which can greatly reduce the thickness of the mobile phone.

[0039] In an exemplary embodiment, at least one of the first to eighth lenses is a glass lens, which can reduce chromatic aberration and improve the performance of the optical imaging lens.

[0040] In an exemplary embodiment, the optical imaging lens according to this application satisfies: -22.0 < (R6 + R8) / (d4m + d7m) < -3.6, where R6 is the radius of curvature of the image-side surface of the third lens, R8 is the radius of curvature of the image-side surface of the fourth lens, d4m is the inner diameter of the image-side surface of the fourth spacer element, and d7m is the inner diameter of the image-side surface of the seventh spacer element. d4m and d7m can be referenced... Figure 1A More specifically, R6, R8, d4m, and d7m can further satisfy: -21.35 < (R6 + R8) / (d4m + d7m) < -3.58. Satisfying -22.0 < (R6 + R8) / (d4m + d7m) < -3.6, when the radii of curvature of the image-side surfaces of the third and fourth lenses are negative, is beneficial to structural stability, reduces manufacturing difficulty, and simultaneously gives the optical imaging lens a better ability to balance chromatic aberration and distortion. Controlling the image-side inner diameters of the fourth and fifth spacers within a certain range prevents stray light generated by reflection from affecting the system's imaging, thereby improving image quality.

[0041] In an exemplary embodiment, the plurality of spacers further includes a front-end spacer element disposed between the lens barrel and the first lens and in contact with the object side surface of the first lens. The optical imaging lens according to this application satisfies: 5.0 < (d1as + d7s) / D7m × (D7s / CT8) < 9.0, where, as... Figure 1A As shown, d1as is the inner diameter of the object-side surface of the front spacer element, D7m is the outer diameter of the image-side surface of the seventh spacer element, d7s is the inner diameter of the object-side surface of the seventh spacer element, D7s is the outer diameter of the object-side surface of the seventh spacer element, and CT8 is the center thickness of the eighth lens on the optical axis. More specifically, d1as, D7m, D7s, and CT8 can further satisfy: 5.22 < (d1as + d7s) / D7m × (D7s / CT8) < 8.86. Satisfying 5.0 < (d1as + d7s) / D7m × (D7s / CT8) < 9.0 is beneficial for increasing light transmission, ensuring a larger aperture while improving the signal-to-noise ratio. Reasonable control of the front spacer element can effectively control the light transmission. Reasonable control of the seventh spacer element helps to reduce stray light and improve image quality. Reasonable control of the center thickness of the eighth lens is beneficial for injection molding.

[0042] In an exemplary embodiment, the optical imaging lens according to this application satisfies: 2.5 < (D1am + D7m - d4m - d7m) / CT7 < 6.5, where, as Figure 1A As shown, D1am is the outer diameter of the image-side surface of the front spacer element, D7m is the outer diameter of the image-side surface of the seventh spacer element, d4m is the inner diameter of the image-side surface of the fourth spacer element, d7m is the inner diameter of the image-side surface of the seventh spacer element, and CT7 is the center thickness of the seventh lens on the optical axis. More specifically, D1am, D7m, d4m, d7m, and CT7 can further satisfy: 2.93 < (D1am + D7m - d4m - d7m) / CT7 < 6.03. Since the seventh lens is usually made of a high-refractive-index material, it is necessary to control the center thickness of the seventh lens to prevent it from breaking easily. Satisfying 2.5 < (D1am + D7m - d4m - d7m) / CT7 < 6.5, and further adjusting the inner diameter of the fourth spacer element and the inner and outer diameters of the seventh spacer element, reduces the risk of time-related defects in the optical imaging lens.

[0043] In an exemplary embodiment, the optical imaging lens according to this application satisfies: -61.0 < (R9 + D4m + D7s) / T78 < 0, where R9 is the radius of curvature of the object-side surface of the fifth lens, D4m is the outer diameter of the image-side surface of the fourth spacer element, D7s is the outer diameter of the object-side surface of the seventh spacer element, and T78 is the air gap between the seventh and eighth lenses on the optical axis. D4m, D7s, and T78 can be referenced. Figure 1A More specifically, R9, D4m, D7s, and T78 can further satisfy: -60.51 < (R9 + D4m + D7s) / T78 < -5.46. Satisfying -61.0 < (R9 + D4m + D7s) / T78 < 0, and by reasonably controlling the outer diameters of the fourth and seventh spacer elements, structural uniformity is ensured, large step differences are avoided, and the assembly stability of the optical imaging lens is improved. Reasonably controlling the radius of curvature of the object-side surface of the fifth lens can keep system distortion within an acceptable range, ensuring good image quality. Reasonable air spacing between the seventh and eighth lenses on the optical axis facilitates lens assembly processes and enables miniaturization.

[0044] In an exemplary embodiment, the optical imaging lens according to this application satisfies: 0 < (D4s + D7m) × tan(Semi-FOV) / CP4 < 70.0, where, as Figure 1AAs shown, D4s is the outer diameter of the object side of the fourth spacer element, D7m is the outer diameter of the image side of the seventh spacer element, CP4 is the maximum thickness of the fourth spacer element along the optical axis direction, and Semi-FOV is half of the maximum field angle of the optical imaging lens. More specifically, D4s, D7m, Semi-FOV, and CP4 further satisfy: 41.0 < (D4s + D7m) × tan(Semi-FOV) / CP4 < 60.0. Satisfying 0 < (D4s + D7m) × tan(Semi-FOV) / CP4 < 70.0 restricts the maximum thickness of the fourth spacer element, which is beneficial to reducing the field curvature sensitivity of the fourth lens, enhancing the structural stability between the fourth lens and the fifth lens, and further improving the imaging quality of the lens group.

[0045] In an exemplary embodiment, the optical imaging lens according to the present application satisfies: 0 < ∑AT / (CP7 × 10) < 26.0, where ∑AT is the sum of the air gaps on the optical axis between any two adjacent lenses from the first lens to the eighth lens, as Figure 1A shown, and CP7 is the maximum thickness of the seventh spacer element along the optical axis direction. More specifically, ∑AT and CP7 further satisfy: 0.61 < ∑AT / (CP7 × 10) < 25.29. Satisfying 0 < ∑AT / (CP7 × 10) < 26.0 is beneficial to avoiding excessive total length of the optical imaging lens, while ensuring the rationality of the thickness of the spacer element, which is beneficial to the miniaturization of the optical imaging lens and the automation of assembly.

[0046] In an exemplary embodiment, the optical imaging lens according to the present application satisfies: -5.0 < f8 / d03m < 0, where, as Figure 1A shown, d03m is the inner diameter of the image-side end of the lens barrel closest to the image side, and f8 is the effective focal length of the eighth lens. More specifically, f8 and d03m further satisfy: -4.64 < f8 / d03m < -1.35. Satisfying -5.0 < f8 / d03m < 0 is beneficial to ensuring that the optical imaging lens has a large aperture and good imaging quality in a dark environment.

[0047] In an exemplary embodiment, the optical imaging lens according to this application satisfies: 3.0 < (L1 + L2 + L3) / (∑CT - ∑AT) < 7.0, where L1 is the maximum height of the first lens barrel along the optical axis, L2 is the maximum height of the second lens barrel along the optical axis, L3 is the maximum height of the third lens barrel along the optical axis, ∑CT is the sum of the center thicknesses of the first to eighth lenses along the optical axis, and ∑AT is the sum of the air gaps between any two adjacent lenses along the optical axis. More specifically, L1, L2, L3, ∑CT, and ∑AT can further satisfy: 3.40 < (L1 + L2 + L3) / (∑CT - ∑AT) < 7.0. Satisfying 3.0 < (L1 + L2 + L3) / (∑CT - ∑AT) < 7.0 helps ensure the uniformity of the thickness of all lenses, reduces field curvature and surface shape sensitivity, and improves product yield.

[0048] In an exemplary embodiment, the optical imaging lens according to this application satisfies: -5.5 < (R16 - R12) / D03m < 1.0, where R16 is the radius of curvature of the image-side surface of the eighth lens, and R12 is the radius of curvature of the image-side surface of the sixth lens. Figure 1A As shown, D03m is the outer diameter of the image-side end of the lens barrel closest to the image side. More specifically, it can satisfy: -5.27 < (R16 - R12) / D03m < 0.67. Satisfying -5.5 < (R16 - R12) / D03m < 1.0, and reasonably controlling the curvature radius of the image-side surface of the sixth lens and the eighth lens, helps to reduce the optical power of the image-side surface of the optical imaging lens, thereby enabling the optical imaging lens to have a better ability to balance chromatic aberration and distortion. Reasonably controlling the outer diameter of the image-side end of the lens barrel closest to the image side is beneficial to controlling the stability of the lens barrel and facilitates matching with subsequent modules.

[0049] In an exemplary embodiment, half of the maximum field of view (Semi-FOV) of the optical imaging lens can be, for example, in the range of 5.6° to 6.3°.

[0050] In an exemplary embodiment, the effective focal length f1 of the first lens may be in the range of -13.43 mm to -12.09 mm, the effective focal length f5 of the fifth lens may be in the range of -11.46 mm to -9.49 mm, and the effective focal length f8 of the eighth lens may be in the range of -22.20 mm to -8.87 mm.

[0051] In exemplary embodiments, the optical imaging lens may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface. This application proposes an optical imaging lens with characteristics such as miniaturization, large image plane, large aperture, and high imaging quality. The optical imaging lens according to the above embodiments of this application can employ multiple lenses, such as the eight lenses mentioned above. By rationally allocating the optical power, surface shape, center thickness of each lens, and on-axis spacing between lenses, incident light can be effectively converged, the overall optical length of the imaging lens can be reduced, and the manufacturability of the imaging lens can be improved, making the optical imaging lens more conducive to manufacturing.

[0052] In the embodiments of this application, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one mirror surface from the object-side surface of the first lens to the image-side surface of the eighth lens is an aspherical mirror surface. The characteristic of an aspherical lens is that its curvature changes continuously from the center to the periphery of the lens. Unlike a spherical lens, which has a constant curvature from the center to the periphery, an aspherical lens has better radius of curvature characteristics, and has the advantages of improving distortion aberrations and astigmatism aberrations. By using an aspherical lens, aberrations occurring during imaging can be eliminated as much as possible, thereby improving image quality. Optionally, at least one of the object-side and image-side surfaces of each of the first, second, third, fourth, fifth, sixth, seventh, and eighth lenses is an aspherical mirror surface. Optionally, the object-side and image-side surfaces of the first, fourth, sixth, seventh, and eighth lenses are aspherical mirrors, while the object-side and image-side surfaces of the second, third, and fifth lenses are spherical mirrors.

[0053] The following describes in further detail, with reference to the accompanying drawings, specific embodiments of the optical imaging lens applicable to the above-described embodiments.

[0054] Example 1

[0055] The following is for reference Figures 2A to 3D The optical imaging lens 1001 and optical imaging lens 1002 according to Embodiment 1 of this application are described. Figure 2A and Figure 2B Schematic diagrams of the optical imaging lens 1001 and optical imaging lens 1002 according to Embodiment 1 of this application are shown respectively.

[0056] like Figure 2A and Figure 2BAs shown, both optical imaging lenses 1001 and 1002 include a prism P, a first lens barrel P01, a second lens barrel P02, a third lens barrel P03, imaging lens groups E1 to E8, and multiple spacer elements P01a to P7.

[0057] like Figure 2A and Figure 2B As shown, optical imaging lenses 1001 and 1002 employ the same imaging lens group. The imaging lens group of optical imaging lenses 1001 and 1002, from the object side to the image side, includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. Specifically, the first lens E1 has negative optical power, with its object-side surface S1 being concave and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being concave. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being concave. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged onto the imaging plane (not shown).

[0058] Table 1 shows the basic parameters of the imaging lens group of optical imaging lens 1001 and optical imaging lens 1002 in Embodiment 1, wherein the units of radius of curvature and thickness / distance are millimeters (mm).

[0059]

[0060] Table 1

[0061] In this example, the effective focal length f1 of the first lens is -12.10mm, the effective focal length f5 of the fifth lens is -11.25mm, the effective focal length f8 of the eighth lens is -22.19mm, and the semi-FOV, half of the maximum field of view of the optical imaging lens, is 6.2°.

[0062] In Example 1, the object-side and image-side surfaces of the first lens E1, the fourth lens E4, the sixth lens E6, the seventh lens E7, and the eighth lens E8 are aspherical surfaces. The surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0063]

[0064] 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 gives the higher-order coefficients A4, A6, A8, A16 that can be used for each aspherical mirror S1, S2, S7, S8, S11-S16 in Example 1. 10 A 12 A 14 A 16 A 18 and A 20 .

[0065] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -1.3769E-01 1.7919E-02 -3.0591E-03 2.3468E-04 4.7700E-05 1.9982E-05 -1.9804E-05 -1.5408E-06 2.2728E-06 S2 -1.9860E-01 1.8117E-02 -3.4087E-03 2.0895E-04 7.7760E-05 2.2827E-05 -2.8759E-05 -2.0800E-06 3.4936E-06 S7 -4.0733E-02 -7.2383E-03 -1.2563E-03 -2.7659E-04 8.4283E-05 8.1005E-05 -4.0398E-05 -1.9887E-05 2.9584E-08 S8 4.7632E-02 -6.9569E-03 -8.6895E-04 3.2463E-04 -9.6195E-06 6.9980E-05 -5.5848E-05 1.0210E-07 2.6216E-06 S11 -1.4633E-02 -2.3340E-03 -2.0903E-03 1.6157E-03 -4.1109E-04 7.7526E-06 -6.4057E-05 2.7592E-05 1.7432E-06 S12 5.2759E-02 -5.5113E-03 -1.3784E-03 1.5511E-03 -4.5245E-04 3.1974E-05 -2.3801E-05 4.5208E-05 -4.2569E-07 S13 7.2246E-02 -1.8742E-03 2.0798E-04 5.7076E-05 9.0323E-06 2.0958E-05 -2.0572E-05 4.6055E-06 -1.6491E-07 S14 8.0300E-02 -4.5427E-03 2.6687E-03 -5.2338E-04 2.9819E-04 -5.2112E-06 4.2630E-05 5.5199E-05 6.8808E-06 S15 -8.8595E-02 -9.1825E-03 3.4890E-03 -1.0278E-03 6.5466E-04 2.2385E-05 1.0506E-04 4.2557E-05 1.1423E-05 S16 -1.4308E-01 -1.2372E-03 2.4477E-03 6.3920E-05 8.2661E-04 1.5592E-04 1.5539E-04 3.2675E-05 7.6523E-06

[0066] Table 2

[0067] like Figure 2A and Figure 2B As shown, both optical imaging lens 1001 and optical imaging lens 1002 include seven spacer elements, namely front spacer element P01a, third spacer element P3, third sub-spacer element P3b, fourth spacer element P4, fifth spacer element P5, fifth sub-spacer element P5b and seventh spacer element P7. Specifically, the front-end spacer element P01a is disposed between the first lens barrel P01 and the first lens E1 and contacts the object side of the first lens E1; the third spacer element P3 and the third sub-spacer element P3b are disposed between the third lens E3 and the fourth lens E4, with the third spacer element P3 contacting the image side of the third lens E3 and the third sub-spacer element P3b contacting the object side of the fourth lens E4; the fourth spacer element P4 is disposed between the fourth lens E4 and the fifth lens E5 and contacts the image side of the fourth lens E4; the fifth spacer element P5 and the fifth sub-spacer element P5b are disposed between the fifth lens E5 and the sixth lens E6, with the fifth spacer element P5 contacting the image side of the fifth lens E5 and the fifth sub-spacer element P5b contacting the object side of the sixth lens E6; and the seventh spacer element P7 is disposed between the seventh lens E7 and the eighth lens E8 and contacts the image side of the seventh lens E7. In this embodiment, the front spacer element P01a, the third spacer element P3, the fourth spacer element P4, the fifth spacer element P5, and the seventh spacer element P7 are spacers, and the third sub-spacer element P3b and the fifth sub-spacer element P5b are spacers. The above seven spacers P01a to P7 can block excess external light from entering, allowing the lens to better support the lens barrel, and enhancing the structural stability of the optical imaging lens 1001 and the optical imaging lens 1002.

[0068] The difference between optical imaging lens 1001 and optical imaging lens 1002 lies in the different dimensions of the spacer element and the lens barrel. Table 3 shows the basic parameters of the spacer element and lens barrel of optical imaging lens 1001 and optical imaging lens 1002 in Embodiment 1.

[0069]

[0070]

[0071] Table 3

[0072] Figure 3A The on-axis chromatic aberration curves of optical imaging lenses 1001 and 1002 of Embodiment 1 are shown, which indicate the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 3B The astigmatism curves of optical imaging lenses 1001 and 1002 of Embodiment 1 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 3C The distortion curves of optical imaging lens 1001 and optical imaging lens 1002 of Embodiment 1 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 3D The magnification chromatic aberration curves of optical imaging lenses 1001 and 1002 of Embodiment 1 are shown, representing the deviations in image height at different points on the imaging plane after light passes through the lenses. According to... Figures 3A to 3D It can be seen that the optical imaging lens 1001 and optical imaging lens 1002 given in Example 1 can achieve good imaging quality.

[0073] Example 2

[0074] The following is for reference Figures 4A to 5D The optical imaging lens 2001 and optical imaging lens 2002 according to Embodiment 2 of this application are described. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to those in Embodiment 1 will be omitted. Figures 4A to 4B Schematic diagrams of the optical imaging lens 2001 and optical imaging lens 2002 according to Embodiment 2 of this application are shown respectively.

[0075] like Figure 4A and Figure 4B As shown, both optical imaging lens 2001 and optical imaging lens 2002 include a prism P, a first lens barrel P01, a second lens barrel P02, a third lens barrel P03, imaging lens groups E1 to E8, and multiple spacer elements P01a to P7b.

[0076] like Figure 4A and Figure 4BAs shown, optical imaging lenses 2001 and 2002 employ the same imaging lens group. The imaging lens group of optical imaging lenses 2001 and 2002, from the object side to the image side, includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. Specifically, the first lens E1 has negative optical power, with its object-side surface S1 being concave and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being concave. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The eighth lens E8 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being concave. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged onto the imaging plane (not shown).

[0077] In this example, the effective focal length f1 of the first lens is -12.22mm, the effective focal length f5 of the fifth lens is -11.45mm, the effective focal length f8 of the eighth lens is -19.21mm, and the semi-FOV (half of the maximum field of view) of the optical imaging lens is 5.7°.

[0078] Table 4 shows the basic parameters of the imaging lens group of optical imaging lens 2001 and optical imaging lens 2002 in Embodiment 2, wherein the units of radius of curvature and thickness / distance are millimeters (mm). Table 5 shows the higher-order coefficients that can be used for each aspherical mirror in Embodiment 2, wherein each aspherical surface shape can be defined by formula (1) given in Embodiment 1 above.

[0079]

[0080] Table 4

[0081] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -1.3672E-01 1.7563E-02 -2.9023E-03 4.3698E-04 -1.2524E-04 1.0697E-04 -6.9027E-05 2.7471E-05 -3.5602E-06 S2 -1.9835E-01 1.7367E-02 -3.0822E-03 4.8427E-04 -1.9583E-04 1.5696E-04 -1.0550E-04 3.6813E-05 -8.5718E-06 S7 -4.2902E-02 -7.7722E-03 2.2307E-04 1.8383E-06 -2.9977E-04 1.3216E-04 -1.2143E-04 1.0449E-05 -1.1744E-06 S8 4.5745E-02 -7.9274E-03 8.8522E-04 2.8440E-05 -2.7517E-04 1.4427E-04 -1.1813E-04 3.4954E-05 -6.0728E-06 S11 4.0075E-03 -8.5184E-03 -7.7595E-04 -1.3196E-04 -1.1990E-04 2.7036E-04 -8.6731E-05 -7.6556E-07 -7.8863E-05 S12 4.0572E-02 -3.1882E-03 -1.5488E-04 3.2238E-04 -3.6517E-07 2.2620E-04 -4.2799E-05 3.2157E-05 -4.3448E-05 S13 7.2685E-02 -2.5968E-03 6.5881E-04 -8.1132E-05 -2.4342E-05 3.0646E-05 -1.5905E-05 3.5834E-06 -1.8033E-07 S14 7.7341E-02 -1.1140E-03 1.6703E-03 -2.1905E-04 2.0390E-04 9.0453E-05 3.2025E-05 3.4013E-05 7.5364E-07 S15 -8.4576E-02 -9.9714E-04 1.0435E-03 -6.5004E-05 2.5187E-04 7.0292E-05 4.0975E-05 1.2884E-05 -1.0013E-06 S16 -1.5120E-01 -9.5169E-04 7.4844E-06 3.8291E-05 1.6196E-04 3.0701E-05 1.7931E-05 -1.5687E-06 -1.4624E-06

[0082] Table 5

[0083] like Figure 4AAs shown, the optical imaging lens 2001 includes seven spacer elements, namely, front spacer element P01a, second spacer element P2, fourth spacer element P4, fifth spacer element P5, fifth sub-spacer element P5b, seventh spacer element P7, and seventh sub-spacer element P7b. Specifically, the front-end spacer element P01a is disposed between the first lens barrel P01 and the first lens E1 and contacts the object side of the first lens E1; the second spacer element P2 is disposed between the second lens E2 and the third lens E3 and contacts the image side of the second lens E2; the fourth spacer element P4 is disposed between the fourth lens E4 and the fifth lens E5 and contacts the image side of the fourth lens E4; the fifth spacer element P5 and the fifth sub-spacer element P5b are disposed between the fifth lens E5 and the sixth lens E6, with the fifth spacer element P5 contacting the image side of the fifth lens E5 and the fifth sub-spacer element P5b contacting the object side of the sixth lens E6; the seventh spacer element P7 and the seventh sub-spacer element P7b are disposed between the seventh lens E7 and the eighth lens E8, with the seventh spacer element P7 contacting the image side of the seventh lens E7 and the seventh sub-spacer element P7b contacting the object side of the eighth lens E8. In this embodiment, the front spacer element P01a, the fourth spacer element P4, the fifth spacer element P5, and the seventh spacer element P7 are spacers, and the second spacer element P2, the fifth sub-spacer element P5b, and the seventh sub-spacer element P7b are spacers. The above seven spacers P01a to P7b can block excess external light from entering, allowing the lens to better support the lens barrel and enhancing the structural stability of the optical imaging lens 1001.

[0084] like Figure 4BAs shown, the optical imaging lens 2002 includes six spacer elements: a front spacer element P01a, a second spacer element P2, a fourth spacer element P4, a fifth spacer element P5, a fifth sub-spacer element P5b, and a seventh spacer element P7. Specifically, the front spacer element P01a is disposed between the first lens barrel P01 and the first lens E1 and contacts the object-side surface of the first lens E1; the second spacer element P2 is disposed between the second lens E2 and the third lens E3 and contacts the image-side surface of the second lens E2; the fourth spacer element P4 is disposed between the fourth lens E4 and the fifth lens E5 and contacts the image-side surface of the fourth lens E4; the fifth spacer element P5 and the fifth sub-spacer element P5b are disposed between the fifth lens E5 and the sixth lens E6, with the fifth spacer element P5 contacting the image-side surface of the fifth lens E5 and the fifth sub-spacer element P5b contacting the object-side surface of the sixth lens E6; and the seventh spacer element P7 is disposed between the seventh lens E7 and the eighth lens E8 and contacts the image-side surface of the seventh lens E7. In this embodiment, the front spacer element P01a, the fourth spacer element P4, and the fifth spacer element P5 are spacers, and the second spacer element P2, the fifth sub-spacer element P5b, and the seventh spacer element P7 are spacers. The above six spacers P01a to P7 can block excess external light from entering, allowing the lens to better support the lens barrel and enhancing the structural stability of the optical imaging lens 1002.

[0085] The difference between optical imaging lens 2001 and optical imaging lens 2002 lies in the different structural dimensions of the spacer element and lens barrel. Table 6 shows the basic parameters of the spacer element and lens barrel of optical imaging lens 2001 and optical imaging lens 2002 in embodiment 2.

[0086]

[0087]

[0088] Table 6

[0089] Figure 5A The on-axis chromatic aberration curves of optical imaging lenses 2001 and 2002 of Embodiment 2 are shown, which indicate the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 5B The astigmatism curves of optical imaging lenses 2001 and 2002 of Embodiment 2 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 5C The distortion curves of optical imaging lens 2001 and optical imaging lens 2002 of Embodiment 2 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 5DThe magnification chromatic aberration curves of optical imaging lenses 2001 and 2002 of Embodiment 2 are shown, representing the deviations in image height at different points on the imaging plane after light passes through the lenses. According to... Figures 5A to 5D It can be seen that the optical imaging lens 2001 and optical imaging lens 2002 given in Example 2 can achieve good imaging quality.

[0090] Example 3

[0091] The following is for reference Figures 6A to 7D The optical imaging lens 3001 and optical imaging lens 3002 according to Embodiment 3 of this application are described. Figures 6A to 6B Schematic diagrams of the optical imaging lens 3001 and optical imaging lens 3002 according to Embodiment 3 of this application are shown respectively.

[0092] like Figure 6A and Figure 6B As shown, both optical imaging lenses 3001 and 3002 include a prism P, a first lens barrel P01, a second lens barrel P02, a third lens barrel P03, imaging lens groups E1 to E8, and multiple spacer elements P01a to P7.

[0093] like Figure 6A and Figure 6B As shown, optical imaging lenses 3001 and 3002 employ the same imaging lens group. The imaging lens group of optical imaging lenses 3001 and 3002, from the object side to the image side, includes: a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a seventh lens E7, and an eighth lens E8. Specifically, the first lens E1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being convex. The fourth lens E4 has positive optical power, with its object-side surface S7 being convex and its image-side surface S8 being convex. The fifth lens E5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being concave. The sixth lens E6 has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The seventh lens E7 has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being convex. The eighth lens E8 has negative optical power, with its object-side surface S15 being concave and its image-side surface S16 being concave. Light from the object passes sequentially through surfaces S1 to S16 and is finally imaged onto the imaging plane (not shown).

[0094] In this example, the effective focal length f1 of the first lens is -13.42mm, the effective focal length f5 of the fifth lens is -9.50mm, the effective focal length f8 of the eighth lens is -8.88mm, and the semi-FOV (half of the maximum field of view) of the optical imaging lens is 6.1°.

[0095] Table 7 shows the basic parameters of the imaging lens group of optical imaging lens 3001 and optical imaging lens 3002 in Embodiment 3, wherein the units of radius of curvature and thickness / distance are millimeters (mm). Table 8 shows the higher-order coefficients that can be used for each aspherical mirror in Embodiment 3, wherein each aspherical surface shape can be defined by formula (1) given in Embodiment 1 above.

[0096]

[0097] Table 5

[0098] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 -1.5156E-01 1.3976E-02 -1.6530E-03 2.7604E-04 -7.9555E-05 3.8091E-05 -1.5568E-05 6.3388E-06 4.0892E-06 S2 -1.8711E-01 1.9270E-02 -2.3802E-03 6.2517E-04 1.4406E-05 1.6476E-04 3.3080E-05 4.5860E-05 1.0044E-05 S7 -4.3712E-02 -2.6784E-02 2.7439E-03 1.8252E-03 1.1563E-03 -6.1086E-04 -8.9273E-04 -3.0229E-04 -9.1548E-05 S8 2.1472E-02 1.7981E-05 -5.2249E-03 -2.5615E-03 2.1609E-03 -1.4805E-04 -1.1096E-04 -2.6627E-04 -3.2710E-04 S11 8.2228E-03 -4.7804E-03 -1.3233E-03 -2.5796E-03 1.4818E-03 3.3234E-04 1.7543E-04 4.1462E-05 3.6005E-05 S12 2.7287E-02 -9.2290E-03 1.6967E-04 -6.5373E-04 1.6114E-03 -1.7305E-03 2.8576E-04 5.1227E-04 3.4698E-04 S13 5.9228E-02 -9.5750E-03 1.4743E-03 -1.0532E-03 3.8046E-04 -1.3596E-04 7.0328E-05 -1.1757E-05 1.2936E-06 S14 8.1988E-02 -1.1422E-02 1.5056E-03 -8.1550E-04 6.9235E-04 -6.8000E-05 1.1979E-04 -3.6121E-05 2.5795E-06 S15 -9.0855E-02 3.3346E-03 5.2030E-05 -2.0027E-04 1.7827E-04 -6.2213E-05 9.9353E-06 -2.1895E-05 4.8949E-06 S16 -1.7343E-01 4.2101E-03 -1.0637E-03 -7.4434E-05 3.3807E-05 5.3162E-06 2.9984E-05 1.1863E-05 7.4814E-06

[0099] Table 6

[0100] like Figure 6A and Figure 6BAs shown, both optical imaging lens 3001 and optical imaging lens 3002 include seven spacer elements, namely front spacer element P01a, third spacer element P3, third sub-spacer element P3b, fourth spacer element P4, sixth spacer element P6, sixth sub-spacer element P6b, and seventh spacer element P7. Specifically, the front-end spacer element P01a is disposed between the first lens barrel P01 and the first lens E1 and contacts the object side of the first lens E1; the third spacer element P3 and the third sub-spacer element P3b are disposed between the third lens E3 and the fourth lens E4, with the third spacer element P3 contacting the image side of the third lens E3 and the third sub-spacer element P3b contacting the object side of the fourth lens E4; the fourth spacer element P4 is disposed between the fourth lens E4 and the fifth lens E5 and contacts the image side of the fourth lens E4; the sixth spacer element P6 and the sixth sub-spacer element P6b are disposed between the sixth lens E6 and the seventh lens E7, with the sixth spacer element P6 contacting the image side of the sixth lens E6 and the sixth sub-spacer element P6b contacting the object side of the seventh lens E7; and the seventh spacer element P7 is disposed between the seventh lens E7 and the eighth lens E8 and contacts the image side of the seventh lens E7. In this embodiment, the front spacer element P01a, the third spacer element P3, the fourth spacer element P4, and the sixth spacer element P6 are spacers, and the third sub-spacer element P3b, the sixth sub-spacer element P6b, and the seventh spacer element P7 are spacers. The above seven spacers P01a to P7 can block excess external light from entering, allowing the lens to better support the lens barrel, and enhancing the structural stability of the optical imaging lens 1001 and the optical imaging lens 3002.

[0101] The difference between optical imaging lens 3001 and optical imaging lens 3002 lies in the different dimensions of the spacer element and the lens barrel. Table 9 shows the basic parameters of the spacer element and lens barrel of optical imaging lens 3001 and optical imaging lens 3002 in embodiment 3.

[0102] Example parameters Optical Imaging Lens 3001 Optical Imaging Lens 3002 D1am(mm) 7.80 7.80 d1as(mm) 5.94 5.94 D7m (mm) 6.22 5.77 d7m(mm) 4.84 4.23 D7s(mm) 5.66 5.77 d7s(mm) 4.56 4.23 d4m(mm) 4.62 4.62 D4s(mm) 6.42 6.42 D4m(mm) 6.42 6.42 D03m(mm) 7.12 6.65 CP4 (mm) 0.022 0.022 CP7 (mm) 0.72 0.03 d03m(mm) 6.45 4.58 L1(mm) 6.24 6.24 L2 (mm) 5.71 5.71 L3 (mm) 4.12 4.18

[0103] Table 9

[0104] Figure 7A The on-axis chromatic aberration curves of optical imaging lenses 3001 and 3002 of Embodiment 3 are shown, which indicate the deviation of the focal point of light of different wavelengths after passing through the lens. Figure 7B The astigmatism curves of optical imaging lenses 3001 and 3002 of Embodiment 3 are shown, which represent the meridional image plane curvature and the sagittal image plane curvature. Figure 7C The distortion curves of optical imaging lenses 3001 and 3002 of Embodiment 3 are shown, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 7DThe magnification chromatic aberration curves of optical imaging lenses 3001 and 3002 in Embodiment 3 are shown, representing the deviations in image height at different points on the imaging plane after light passes through the lenses. According to... Figures 7A to 7D It can be seen that the optical imaging lens 3001 and optical imaging lens 3002 given in Example 3 can achieve good imaging quality.

[0105] In summary, the optical imaging lenses 1001, 1002, 2001, 2002, 3001 and 1003 of Examples 1 to 3 satisfy the relationships shown in Table 10.

[0106] Conditional / Optical Imaging Lens 1001 1002 2001 2002 3001 3002 (d1as+d7s) / D7m×(D7s / CT8) 8.85 8.85 5.32 5.23 6.20 6.59 (D1am+D7m-d4m-d7m) / CT7 3.99 2.94 3.06 3.14 5.82 6.02 (R9+D4m+D7s) / T78 -59.65 -60.50 -24.49 -24.49 -5.57 -5.47 (D4s+D7m)×tan(Semi-FOV) / CP4 49.98 47.14 41.97 41.97 59.15 59.68 (R6+R8) / (d4m+d7m) -21.34 -20.45 -12.37 -12.37 -3.57 -3.81 (R16-R12) / D03m 0.62 0.66 -2.66 -2.56 -4.91 -5.26 ∑AT / (CP7×10) 25.28 1.15 0.62 0.62 0.83 19.97 f8 / d03m -3.35 -4.63 -3.08 -3.96 -1.38 -1.94 (L1+L2+L3) / (∑CT-∑AT) 6.06 6.12 3.41 3.42 3.46 3.48

[0107] Table 10

[0108] 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, include: The imaging lens assembly, along the optical axis from the object side to the image side, sequentially includes: a first lens with negative optical power, a second lens with positive optical power, a third lens with positive optical power, a fourth lens with positive optical power, a fifth lens with negative optical power, a sixth lens with positive optical power, a seventh lens with positive optical power, and an eighth lens with negative optical power, wherein the radius of curvature of the object side surface of the eighth lens is negative; wherein, The radius of curvature of the image-side surface of the first lens is positive; The object-side and image-side radii of curvature of the second lens are both positive; The object-side radius of curvature of the third lens is positive, and the image-side radius of curvature is negative. The object-side radius of curvature of the fourth lens is positive, and the image-side radius of curvature is negative. The fifth lens has a negative radius of curvature on the object side and a positive radius of curvature on the image side. The object-side and image-side radii of curvature of the sixth lens are both positive. The radius of curvature of the object-side surface of the seventh lens is positive; The radius of curvature of the image-side surface of the eighth lens is positive; and Multiple spacer elements, including a fourth spacer element positioned between the fourth lens and the fifth lens and in contact with the image-side surface of the fourth lens, and a seventh spacer element positioned between the seventh lens and the eighth lens and in contact with the image-side surface of the seventh lens; wherein, The number of lenses with optical power in the imaging lens group is eight; The radius of curvature R6 of the image side surface of the third lens, the radius of curvature R8 of the image side surface of the fourth lens, the inner diameter d4m of the image side surface of the fourth spacer element, and the inner diameter d7m of the image side surface of the seventh spacer element satisfy: -21.35<(R6+R8) / (d4m+d7m)<-3.6; The radius of curvature R9 of the object side of the fifth lens, the outer diameter D4m of the image side of the fourth spacer element, the outer diameter D7s of the object side of the seventh spacer element, and the air gap T78 between the seventh lens and the eighth lens on the optical axis satisfy: -60.51 < (R9 + D4m + D7s) / T78 < -5.

46.

2. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens further includes a lens barrel for accommodating the imaging lens assembly and the plurality of spacers, wherein the plurality of spacers further includes a front end spacer element disposed between the lens barrel and the first lens and in contact with the object side surface of the first lens, wherein... The inner diameter d1as of the object side of the front-end spacer, the outer diameter D7m of the image side of the seventh spacer, the inner diameter d7s of the object side of the seventh spacer, the outer diameter D7s of the object side of the seventh spacer, and the center thickness CT8 of the eighth lens on the optical axis satisfy: 5.22 < (d1as + d7s) / D7m × (D7s / CT8) < 8.

86.

3. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens further includes a lens barrel for accommodating the imaging lens assembly and the plurality of spacers, wherein the plurality of spacers further includes a front end spacer element disposed between the lens barrel and the first lens and in contact with the object side surface of the first lens, wherein... The outer diameter D1am of the image side of the front end spacer, the outer diameter D7m of the image side of the seventh spacer, the inner diameter d4m of the image side of the fourth spacer, the inner diameter d7m of the image side of the seventh spacer, and the center thickness CT7 of the seventh lens on the optical axis satisfy: 2.93 < (D1am + D7m - d4m - d7m) / CT7 < 6.

03.

4. The optical imaging lens according to claim 1, characterized in that, The outer diameter D4s of the object side of the fourth spacer element, the outer diameter D7m of the image side of the seventh spacer element, the maximum thickness CP4 of the fourth spacer element along the optical axis, and half of the maximum field of view (Semi-FOV) of the optical imaging lens satisfy the following: 41.97≤(D4s+D7m)×tan(Semi-FOV) / CP4≤59.

68.

5. The optical imaging lens according to claim 1, characterized in that, The sum of the air gaps ∑AT between any two adjacent lenses in the first to the eighth lens along the optical axis and the maximum thickness CP7 of the seventh spacer element along the optical axis satisfy: 0.61 < ∑AT / (CP7 × 10) < 25.

29.

6. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens further includes a lens barrel for accommodating the imaging lens group and the plurality of spacer elements. The inner diameter d03m of the image-side end of the lens barrel closest to the image side satisfies -4.64 with the effective focal length f8 of the eighth lens. <f8 / d03m<-1.35。 7. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens also includes a lens barrel for accommodating the imaging lens group and the plurality of spacer elements, the lens barrel comprising a first lens barrel, a second lens barrel and a third lens barrel in sequence along the optical axis from the object side to the image side; The maximum height L1 of the first lens barrel along the optical axis, the maximum height L2 of the second lens barrel along the optical axis, the maximum height L3 of the third lens barrel along the optical axis, the sum of the center thicknesses of the first lens to the eighth lens on the optical axis ∑CT, and the sum of the air gaps on the optical axis between any two adjacent lenses among the first lens to the eighth lens ∑AT satisfy: 3.40 < (L1 + L2 + L3) / (∑CT - ∑AT) ≤ 6.

12.

8. The optical imaging lens according to claim 1, characterized in that, The optical imaging lens also includes a lens barrel for accommodating the imaging lens group and the plurality of spacer elements. The radius of curvature R16 of the image side of the eighth lens, the radius of curvature R12 of the image side of the sixth lens, and the outer diameter D03m of the image side end of the lens barrel closest to the image side satisfy: -5.27 < (R16-R12) / D03m < 0.

67.

9. The optical imaging lens according to any one of claims 1 to 8, characterized in that, The optical imaging lens also includes a prism disposed between the first lens and the object side.

10. The optical imaging lens according to any one of claims 1 to 8, characterized in that, At least one of the first to the eighth lenses is a glass lens.

11. The optical imaging lens according to any one of claims 1 to 8, characterized in that, The plurality of spacer elements comprises at least six spacer elements.

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