Optical imaging lens
By combining five lenses and using precise design of spacers, the contradiction between thinness and high image quality in traditional lenses has been resolved, achieving stable aberration correction and efficient stray light suppression, thus improving the lens's imaging performance and stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ZHEJIANG SUNNY OPTICAL CO LTD
- Filing Date
- 2026-03-04
- Publication Date
- 2026-05-12
AI Technical Summary
Traditional optical imaging lenses struggle to balance a slim and lightweight design with high image quality. In particular, the overall length of the lens exceeds the limit in zoom functions, and the ability to suppress stray light is insufficient. They are also sensitive to assembly errors and environmental changes, resulting in unstable aberration correction.
By employing a combination of five lenses with specific optical power properties, and by limiting the ratio of the focal length of the lens combination to the air gap, and using multiple spacer elements at intervals along the optical axis, a robust front structure is formed, which suppresses assembly stress and temperature deformation, locks the lens position, and achieves stable aberration correction.
It achieves a balance between a slim and lightweight structure and high image quality, improves modulation transfer function (MTF) performance and image quality, and ensures the stability and image sharpness of the lens during dynamic zoom.
Smart Images
Figure CN122018118A_ABST
Abstract
Description
Technical Field
[0001] This application generally relates to the field of optical imaging equipment technology. More specifically, this application relates to an optical imaging lens. Background Technology
[0002] With the rapid development of augmented reality and virtual reality technologies, their optical imaging systems need to simultaneously meet the high imaging quality requirements of wide field of view, high resolution, and low distortion, as well as the stringent limitations of wearable devices in terms of small size and light weight. Traditional optical designs are unable to meet both of these requirements.
[0003] In existing technologies, front-facing cameras mostly employ a fixed focal length design, which cannot achieve dynamic focusing and limits the flexibility of usage scenarios. To achieve zoom functionality, conventional zoom modules often require seven or more lenses, directly resulting in an excessively long lens, making it difficult to meet the requirements of wearable devices for compact size and lightweight design. Simultaneously, traditional lenses lack sufficient stray light suppression capabilities, and excess stray light can easily interfere with the imaging process, affecting image clarity. To balance miniaturization and image quality, some designs attempt to achieve miniaturization by compressing the lens space. However, the lens responsible for core aberration correction becomes sensitive to assembly errors and changes in ambient temperature and humidity due to space constraints. Even minor deviations in assembly or thermal expansion can disrupt the aberration correction state of the optical imaging system, leading to severe degradation and instability of the lens modulation transfer function performance, making it difficult to guarantee consistently high image quality.
[0004] In view of this, there is an urgent need to provide an optical imaging lens that can achieve a balance between a thin and light structure and high image quality, thereby effectively improving optical performance. Summary of the Invention
[0005] In order to at least solve one or more of the technical problems mentioned above, this application proposes an optical imaging lens that can achieve a thin and light structure and high imaging quality in the following aspects.
[0006] In a first aspect, the present application provides an optical imaging lens, comprising a second barrel and a lens group and a plurality of spacer elements disposed in the second barrel; the lens group includes, in order from the object side to the image side along the optical axis of the optical imaging lens: a first lens having a positive focal power, a second lens having a negative focal power, a third lens having a positive focal power, a fourth lens having a negative focal power, and a fifth lens having a negative focal power; an air gap between the fourth lens and the fifth lens on the optical axis is greater than the sum of the air gaps between other adjacent lenses in the lens group on the optical axis; the plurality of spacer elements includes a first spacer element, a second spacer element, a third spacer element, and a fourth spacer element; the first spacer element is disposed on the image side of the first lens and is in contact with the image side surface of the first lens; the second spacer element is disposed on the image side of the second lens and is in contact with the image side surface of the second lens; the third spacer element is disposed on the image side of the third lens and is in contact with the image side surface of the third lens; the fourth spacer element is disposed on the image side of the fourth lens and is in contact with the image side surface of the fourth lens; an inner diameter d02m of the image side end surface of the second barrel and an entrance pupil diameter EPD of the optical imaging lens satisfy: 2.85 < d02m / EPD ≤ 3.20; a combined focal length f34 of the third lens and the fourth lens and an air gap T34 between the third lens and the fourth lens on the optical axis satisfy: 56.65 < f34 / T34 < 65.45; a spacing distance EP12 between the first spacer element and the second spacer element in the optical axis direction, a spacing distance EP23 between the second spacer element and the third spacer element in the optical axis direction, and a spacing distance EP34 between the third spacer element and the fourth spacer element in the optical axis direction satisfy: 1.45 < (EP12 + EP23) / EP34 < 2.00.
[0007] In some embodiments, the optical imaging lens further includes a first barrel disposed on the object side of the first lens and an autofocus component disposed therein, the autofocus component having a variable curvature surface; the second barrel has a stepped surface near the object side, and the first barrel and the second barrel are abutted against each other through the stepped surface.
[0008] In some embodiments, the image side surface of the second spacer element is in contact with the object side surface of the third lens;
[0009] An outer diameter D2m of the image side surface of the second spacer element and an inner diameter d2m of the image side surface of the second spacer element satisfy: 2.15 < D2m / d2m < 2.60; an outer diameter D3s of the object side surface of the third spacer element and an inner diameter d3s of the object side surface of the third spacer element satisfy: 1.95 ≤ D3s / d3s < 2.45.
[0010] In some embodiments, the maximum height L2 of the second lens barrel and the air gap T45 between the fourth lens and the fifth lens on the optical axis satisfy: 3.35 < L2 / T45 ≤ 4.50.
[0011] In some embodiments, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the effective focal length f of the optical imaging lens satisfy: 1.45 < (f1 + |f2|) / f < 1.70; the maximum height L2 of the second lens barrel, the distance EP01 from the object-side end face of the second lens barrel to the object-side face of the first spacer element along the optical axis, and the distance EP12 between the first spacer element and the second spacer element along the optical axis satisfy: 2.60 < L2 / (EP01 + EP12) < 3.70.
[0012] In some embodiments, the air gap T45 between the fourth lens and the fifth lens on the optical axis and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy: 10.05 < T45 / T34 ≤ 13.65; the distance EP34 between the third spacer element and the fourth spacer element along the optical axis and the distance EP23 between the second spacer element and the third spacer element along the optical axis satisfy: 1.40 < EP34 / EP23 < 2.10.
[0013] In some embodiments, the distance EP12 between the first spacer element and the second spacer element along the optical axis, the air gap T12 between the first lens and the second lens on the optical axis, and the air gap T23 between the second lens and the third lens on the optical axis satisfy: 1.85 < EP12 / (T12 + T23) ≤ 3.35.
[0014] In some embodiments, the combined focal length f12 of the first lens and the second lens, the inner diameter d1s of the object-side face of the first spacer element, and the inner diameter d2s of the object-side face of the second spacer element satisfy: 2.05 < f12 / (d1s + d2s) ≤ 2.45.
[0015] In some embodiments, the effective focal length f3 of the third lens and the effective focal length f2 of the second lens satisfy: -1.25 < f3 / f2 < -0.85; the outer diameter D3s of the object-side face of the third spacer element and the outer diameter D2m of the image-side face of the second spacer element satisfy: 0.95 < D3s / D2m < 1.25.
[0016] In some embodiments, the effective focal length f4 of the fourth lens and the effective focal length f3 of the third lens satisfy: -8.00 < f4 / f3 < -3.65; the maximum outer diameter OD4 of the fourth lens and the maximum outer diameter OD3 of the third lens satisfy: 1.10 < OD4 / OD3 ≤ 1.25.
[0017] In some embodiments, the outer diameter D02s of the object-side end face of the second barrel, the maximum outer diameter OD1 of the first lens, and the effective radius DT11 of the first lens satisfy: 2.15 < D02s / (OD1 - DT11×2) < 3.05.
[0018] In some embodiments, the axial spacing distance EP23 between the second spacer element and the third spacer element, and the axial distance ED3 between the vertex of the effective radius of the image side of the third lens and the vertex of the effective radius of the object side of the fourth lens satisfy: 1.95 < EP23 / ED3 < 3.05.
[0019] In some embodiments, the air gap T45 on the optical axis between the fourth lens and the fifth lens, and the maximum thickness CP4 of the fourth spacer element in the axial direction satisfy: 1.75 < T45 / CP4 < 2.10.
[0020] As provided above, the optical imaging lens adopts a combination of five lenses with specific optical power attributes and satisfies the following conditions: the ratio of the inner diameter d02m of the image-side end face of the second lens barrel to the entrance pupil diameter EPD is 2.85 < d02m / EPD ≤ 3.20; the ratio of the combined focal length f34 of the third lens and the fourth lens to their air gap T34 is 56.65 < f34 / T34 < 65.45; and the air gap between the fourth lens and the fifth lens on the optical axis is greater than the sum of the air gaps between other adjacent lenses in the lens group on the optical axis. The ratio of the aforementioned d02m to EPD defines the radial structural space of the rear and middle sections of the lens, and the constraint on the air gap defines the axial structural conditions. Under the combined constraints of the radial and axial structural conditions, the third lens and the fourth lens are compressed in a limited middle section space. Although these two lenses have strong optical aberration correction capabilities due to their small combined focal length, their positions, spacings, and tilts are relatively sensitive to assembly errors and changes in environmental temperature and humidity. Minor deviations or thermal expansion are likely to disrupt the aberration correction state, resulting in a serious decline and instability in the modulation transfer function (MTF) performance. Based on this, the present application further defines that the interval distances EP12, EP23, and EP34 of the first spacer element, the second spacer element, the third spacer element, and the fourth spacer element along the optical axis direction satisfy the conditional formula 1.45 < (EP12 + EP23) / EP34 < 2.00. Since the distances between the spacer elements are related to the thickness of the non-transmissive regions of the lenses, this conditional formula forms a solid front structure between the first lens and the second lens by constraining the spacing relationship of the first to fourth spacer elements, effectively suppressing the transmission of assembly stress and temperature deformation to the third lens and the fourth lens. This front structure can lock the positions of the front group of lenses and provide a stable bearing reference for the third lens and the fourth lens. As a result, the relative positions and attitudes of the third lens and the fourth lens are not likely to change during production and use, and their aberration correction capabilities can be stably and repeatedly realized, ultimately obtaining high levels of central MTF and edge MTF, achieving field curvature correction, and effectively improving the optical performance and imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features, and advantages of the exemplary embodiments of the present application will become readily understood. In the drawings, several embodiments of the present application are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein: Figure 1 A partial dimension marking diagram of the optical imaging lens of an optional embodiment of the present application is shown; Figure 2 A schematic diagram of OD1, OD3, OD4, and ED3 of the present application is shown; Figure 3The modulation transfer function diagram of a portion of the field of view of an optical imaging lens satisfying d02m / EPD=2.9, f34 / T34=65.39, and (EP12+EP23) / EP34=1.4 is shown in the comparative example 1 of this application. Figure 4 The diagram shows the modulation transfer function of a portion of the field of view of an optical imaging lens satisfying d02m / EPD=2.9, f34 / T34=65.39, and (EP12+EP23) / EP34=1.6 according to Embodiment 3 of this application. Figure 5 The modulation transfer function diagram of a portion of the field of view of an optical imaging lens satisfying d02m / EPD=2.9, f34 / T34=65.39, and (EP12+EP23) / EP34=2.2 is shown in the comparative example 2 of this application. Figure 6 A schematic diagram of an optical system according to an alternative embodiment of this application is shown; Figure 7 A schematic diagram of the structure of the optical imaging lens of Embodiment 1-1 of this application is shown; Figure 8 A schematic diagram of the structure of the optical imaging lens of Embodiments 1-2 of this application is shown; Figure 9 Schematic diagrams of the optical imaging lenses of embodiments 1-3 of this application are shown; Figure 10 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 1 of this application at an object distance of 550 mm is shown; Figure 11 The astigmatism curve of the optical imaging lens of Embodiment 1 of this application at an object distance of 550 mm is shown; Figure 12 A schematic diagram of the structure of the optical imaging lens of Embodiment 2-1 of this application is shown; Figure 13 A schematic diagram of the structure of the optical imaging lens of Embodiment 2-2 of this application is shown; Figure 14 A schematic diagram of the structure of the optical imaging lens of Embodiments 2-3 of this application is shown; Figure 15 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 2 of this application at an object distance of 550 mm is shown; Figure 16 The astigmatism curve of the optical imaging lens of Embodiment 2 of this application at an object distance of 550 mm is shown; Figure 17 A schematic diagram of the structure of the optical imaging lens of Embodiment 3-1 of this application is shown; Figure 18A schematic diagram of the structure of the optical imaging lens of Embodiment 3-2 of this application is shown; Figure 19 A schematic diagram of the structure of the optical imaging lens of Embodiment 3-3 of this application is shown; Figure 20 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 3 of this application at an object distance of 550 mm is shown; Figure 21 The astigmatism curve of the optical imaging lens of Embodiment 3 of this application at an object distance of 550 mm is shown. Detailed Implementation
[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0023] It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application. As used in this specification and claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this specification and claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.
[0024] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.
[0025] In this application, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this application.
[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 feature.
[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 drawn strictly to scale.
[0028] In this specification, the effective radius of a lens refers to the radius of the area on the lens surface through which imaging light passes, i.e., the maximum range through which light actually passes. The area of the lens surface within the effective radius is the light-transmitting area, used for light transmission and imaging. The area of the lens surface outside the effective radius, in contact with the lens barrel or spacer element, is the non-light-transmitting area, typically used for lens support and fixation, and does not participate in light transmission.
[0029] In this application, the object side refers to the side of the optical imaging lens facing the object being photographed (not shown in the figure), and the image side refers to the side of the optical imaging lens facing the imaging plane. In the following text, the object side of the lens refers to the surface of the lens facing the object being photographed (not shown in the figure), and the image side of the lens refers to the surface of the lens facing the imaging plane. In the structural schematic diagram shown in this application, the left side is the object side, and the right side is the image side.
[0030] For ease of understanding, let's first combine... Figure 1 and Figure 2 The components and dimensions of the optical imaging lens mentioned below will be described in detail. For ease of description, the surface shape of the optical imaging lens and specific lenses will be described in specific embodiments later, and these parameters will not be shown here.
[0031] like Figure 1 As shown, P01 is the first lens barrel, P02 is the second lens barrel, P1 is the first spacer element, P2 is the second spacer element, P3 is the third spacer element, P4 is the fourth spacer element, and P4b is the fourth auxiliary spacer element.
[0032] D02s is the outer diameter of the object-side end face of the second lens tube, d2s is the inner diameter of the object-side side of the second spacer element, d2m is the inner diameter of the image-side side of the second spacer element, d1s is the inner diameter of the object-side side of the first spacer element, d1m is the inner diameter of the image-side side of the first spacer element, d3s is the inner diameter of the object-side side of the third spacer element, D2m is the outer diameter of the image-side side of the second spacer element, D3s is the outer diameter of the object-side side of the third spacer element, and d02m is the inner diameter of the image-side end face of the second lens tube.
[0033] EP01 is the distance between the object side end face of the second lens barrel and the object side face of the first spacer element along the optical axis; EP12 is the distance between the first spacer element and the second spacer element along the optical axis; EP23 is the distance between the second spacer element and the third spacer element along the optical axis; EP34 is the distance between the third spacer element and the fourth spacer element along the optical axis; and CP4 is the maximum thickness of the fourth spacer element along the optical axis.
[0034] L2 is the maximum height of the second lens tube. For example... Figure 2 As shown, OD1 is the maximum outer diameter of the first lens, OD3 is the maximum outer diameter of the third lens, OD4 is the maximum outer diameter of the fourth lens, and ED3 is the distance along the optical axis between the vertex of the effective radius on the image side of the third lens and the vertex of the effective radius on the object side of the fourth lens.
[0035] It should be noted that embodiments of this application may also include those without bonding. Figure 1 and Figure 2 Other components and dimensions described will not be repeated here. Furthermore, the optical axis mentioned above and below specifically refers to the central axis of symmetry of the optical imaging lens, around which all lenses are arranged coaxially.
[0036] Next, the optical imaging lens provided in this application will be described in detail. The optical imaging lens includes a second lens barrel and a lens group and multiple spacer elements disposed within the second lens barrel. The lens group, along the optical axis of the optical imaging lens from the object side to the image side, sequentially includes: a first lens with positive optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with negative optical power, and a fifth lens with negative optical power. The air gap between the fourth and fifth lenses on the optical axis is greater than the sum of the air gaps on the optical axis of the other adjacent lenses in the lens group.
[0037] The plurality of spacers includes a first spacer, a second spacer, a third spacer, and a fourth spacer. The first spacer is placed on the image side of the first lens and is in contact with the image side of the first lens; the second spacer is placed on the image side of the second lens and is in contact with the image side of the second lens; the third spacer is placed on the image side of the third lens and is in contact with the image side of the third lens; and the fourth spacer is placed on the image side of the fourth lens and is in contact with the image side of the fourth lens.
[0038] Furthermore, the inner diameter d02m of the image-side end face of the second lens barrel and the entrance pupil diameter EPD of the optical imaging lens satisfy: 2.85 < d02m / EPD ≤ 3.20; the combined focal length f34 of the third lens and the fourth lens and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy: 56.65 < f34 / T34 < 65.45; the axial spacing distance EP12 between the first spacer and the second spacer, the axial spacing distance EP23 between the second spacer and the third spacer, and the axial spacing distance EP34 between the third spacer and the fourth spacer satisfy: 1.45 < (EP12 + EP23) / EP34 < 2.00.
[0039] Next, refer to Figures 3 to 5 to understand the influence on the modulation transfer function graph of partial fields of the optical imaging lens when the optical imaging lens satisfies 2.85 < d02m / EPD ≤ 3.20 and 57.15 < f34 / T34 < 66.45. For example, when d02m / EPD = 2.9 and f34 / T34 = 65.39, different values of the conditional expression (EP12 + EP23) / EP34 have different effects.
[0040] Figure 3 The MTF curve graph of the optical imaging lens of Comparative Example 1 of the present application is shown. Specifically, from Figure 3 it can be seen that in this example, when the optical imaging lens satisfies d02m / EPD = 2.9, f34 / T34 = 65.39, and (EP12 + EP23) / EP34 = 1.4, the MTF curves corresponding to the 0.5 field, 0.8 field, and 1.0 field are significantly shifted to the left, and the central peak values of each curve are relatively low, and the concentration of the curves is insufficient.
[0041] Figure 4 The MTF curve graph of the optical imaging lens of Comparative Example 2 of the present application is shown. Specifically, from Figure 4 it can be seen that in this example, when d02m / EPD = 2.9, f34 / T34 = 65.39, and (EP12 + EP23) / EP34 = 1.6 are satisfied, the MTF curves corresponding to the fields of 0.0, 0.5, 0.8, and 1.0 do not show obvious offsets, have good concentration, and the curves of each field are closely close to the diffraction limit and have relatively high peak values.
[0042] Figure 5 The MTF curve graph of the optical imaging lens of Comparative Example 3 of the present application is shown. Specifically, from Figure 5It can be seen that in this example, when d0m / EPD = 2.9, f34 / T34 = 65.39, and (EP12 + EP23) / EP34 = 2.2 are satisfied, the concentration of the MTF curves corresponding to the 0.0 field of view, 0.5 field of view, 0.8 field of view, and 1.0 field of view is poor, the peak value is significantly reduced, and the imaging quality is poor.
[0043] The optical imaging lens of the present application adopts a combination of five lenses with specific optical power attributes and satisfies: the ratio of the inner diameter d02m of the image-side end face of the second lens barrel to the entrance pupil diameter EPD is 2.85 < d02m / EPD ≤ 3.20, the ratio of the combined focal length f34 of the third lens and the fourth lens to their air gap T34 is 56.65 < f34 / T34 < 65.45, and the air gap between the fourth lens and the fifth lens on the optical axis is greater than the sum of the air gaps between other adjacent lenses in the lens group on the optical axis. As mentioned above, the ratio of d02m to EPD limits the radial structural space of the rear and middle sections of the lens, and the constraint of its air gap limits the axial structural conditions. Under the combined constraints of the radial and axial structural conditions, the third lens and the fourth lens are compressed in a limited middle section space. Although these two lenses have a strong optical aberration correction ability with a small combined focal length, their position, spacing, and tilt are relatively sensitive to assembly errors and changes in environmental temperature and humidity. Minor deviations or thermal expansion are likely to破坏 the aberration correction state, resulting in a serious decline and instability in the modulation transfer function (MTF) performance. Based on this, the present application further limits that the spacing distances EP12, EP23, EP34 of the first spacer element, the second spacer element, the third spacer element, and the fourth spacer element along the optical axis satisfy the conditional formula 1.45 < (EP12 + EP23) / EP34 < २.००. Since the distance between the spacer elements is related to the thickness of the non-transmissive area of the lens, this conditional formula constrains the spacing relationship between the first to fourth spacer elements, enabling the first lens and the second lens to form a solid front structure, effectively suppressing the transmission of assembly stress and temperature deformation to the third lens and the fourth lens. This front structure can lock the position of the front group of lenses and provide a stable bearing reference for the third lens and the fourth lens. Thus, the relative position and attitude of the third lens and the fourth lens are not easily changed during production and use, and their aberration correction ability can be stably and repeatedly realized, ultimately obtaining a high level of central MTF and edge MTF, achieving field curvature correction, and effectively improving the optical performance and imaging quality.
[0044] In some embodiments of the present application, the optical imaging lens further includes an autofocus component, i.e., the Tlens module, disposed on the object side of the first lens. As Figure 6 shown, the optical imaging lens of the present application sequentially includes an autofocus component T, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, and a filter E6 along the optical axis from the object side to the image side. It should be noted that there is an unclear symbol "२.००" in the translation of item . It might be a special symbol in the original text that needs to be further clarified. If it is a misrepresentation, please correct it according to the actual situation.
[0045] Among them, the autofocus component T sequentially includes a light-transmitting substrate, a liquid material, and a flexible film along the optical axis from the object side to the image side, correspondingly forming Figure 6 the first surface S1, the second surface S2, the third surface S3, and the fourth surface S4 shown in Figure 6 , and the third surface S3 and the fourth surface S4 are variable-curvature surfaces. The liquid material is connected to the conductive material. When an external voltage is applied to the conductive material, the volume of the liquid material changes, causing the image side surface to deform, and then driving the flexible film to deform, so as to change the focal length of the autofocus component and realize the adjustment of the total effective focal length of the optical imaging lens. The first lens E1 has an object side surface S5 and an image side surface S6, the second lens E2 has an object side surface S7 and an image side surface S8, the third lens E3 has an object side surface S9 and an image side surface S10, the fourth lens E4 has an object side surface S11 and an image side surface S12, the fifth lens E5 has an object side surface S13 and an image side surface S14, the filter E6 has an object side surface S15 and an image side surface S16, and the imaging surface is S17.
[0046] Furthermore, an annular stepped surface is provided at the off-axis position of the object side surface of the second lens barrel. The object side end surface of the second lens barrel is the vertical axis surface closest to the object side of the second lens barrel. The autofocus component is assembled inside the first lens barrel, and then through the cooperation of the first lens barrel and the second lens barrel, the edge of the image side surface of the first lens barrel is accurately abutted against the stepped surface of the second lens barrel. Thus, by changing the radius of curvature of the variable-curvature surface, the object distance of the optical imaging lens can be flexibly adjusted to meet the focusing requirements in different scenarios.
[0047] The autofocus component is fixed by the way of abutting against the stepped surface, abandoning the traditional gluing or press-ring fixing form, which can effectively reduce the eccentricity error easily generated by such fixing methods, ensure the concentricity of the variable-curvature surface and the lens optical axis, and effectively reduce the fluctuation of wavefront aberration during the dynamic zoom process. At the same time, the stepped surface can provide uniform mechanical support for the autofocus component, effectively resist the stress concentration generated when it is deformed by electricity, avoid structural damage or optical performance deviation caused by uneven local stress of the module, and significantly enhance the reliability and stability of dynamic zoom.
[0048] In some embodiments of the present application, the image side surface of the second spacer element contacts the object side surface of the third lens. At the same time, between the outer diameter D2m and the inner diameter d2m of the image side surface of the second spacer element, 2.15 < D2m / d2m < 2.60 is satisfied; between the outer diameter D3s and the inner diameter d3s of the object side surface of the third spacer element, 1.95 ≤ D3s / d3s < 2.45 is satisfied. By restricting the ratio of the outer diameter to the inner diameter of the image side surface of the second spacer element and the ratio of the outer diameter to the inner diameter of the object side surface of the third spacer element, large-angle stray light passing through the second lens and the third lens can be blocked, especially the interface reflection generated during the dynamic zoom of the autofocus component can be suppressed, and the ghost intensity can be reduced.
[0049] In some embodiments of the present application, for the maximum height L2 of the second lens barrel and the air gap T45 between the fourth lens and the fifth lens on the optical axis, the conditional formula 3.35 < L2 / T45 ≤ 4.5 is satisfied. The air gap between the fourth lens and the fifth lens on the optical axis is the largest air gap value in the lens group. By reasonably controlling the proportion of the length of T45 in the second lens barrel to restrict the size of its air gap, it not only adapts to the requirement of the device being thin and light, but also reserves sufficient air gap tolerance space, thereby significantly reducing the sensitivity of the lens to the assembly attitude deviation, thus relaxing the stringent requirements for the assembly accuracy and improving the production yield.
[0050] In some embodiments of the present application, for the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the effective focal length f of the optical imaging lens, 1.45 < (f1 + |f2|) / f < 1.70 is satisfied. For the maximum height L2 of the second lens barrel, the distance EP01 on the optical axis between the object side end face of the second lens barrel and the object side face of the first spacer element, and the distance EP12 on the optical axis between the first spacer element and the second spacer element, 2.60 < L2 / (EP01 + EP12) < 3.70 is satisfied. By restricting the proportion of the effective focal lengths of the first lens and the second lens in the optical imaging lens, and the proportion relationship between the axial distance from the object side end face of the second lens barrel to the object side face of the second spacer element (i.e., the sum of EP01 and EP12) and the height of the lens barrel, the total length of the entire lens group is effectively compressed, reserving sufficient dynamic zoom installation and working space for the front autofocus component, and ensuring the smooth realization of its zoom function.
[0051] In some embodiments of the present application, for the air gap T45 between the fourth lens and the fifth lens on the optical axis and the air gap T34 between the third lens and the fourth lens on the optical axis, 10.05 < T45 / T34 ≤ 13.65 is satisfied. For the distance EP34 on the optical axis between the third spacer element and the fourth spacer element and the distance EP23 on the optical axis between the second spacer element and the third spacer element, 1.40 < EP34 / EP23 < 2.10 is satisfied. The air gap between the fourth lens and the fifth lens is much larger than the air gap between the third lens and the fourth lens. By reasonably distributing the distances between the spacer elements, the maximum thickness of the non-light-transmitting area between the third lens and the fourth lens can be restricted, avoiding structural redundancy caused by the excessive thickness of the non-light-transmitting area. At the same time, the problems caused by too large EP34 can be effectively prevented. It not only reduces the processing difficulty during the lens forming process and ensures the forming accuracy, but also avoids the influence on the positioning accuracy of the lens group due to too large spacing distance during assembly, enhancing the assembly stability of the entire optical system.
[0052] In some embodiments of the present application, the spacing distance EP12 between the first spacer element and the second spacer element along the optical axis direction, the air gap T12 between the first lens and the second lens on the optical axis, and the air gap T23 between the second lens and the third lens on the optical axis satisfy 1.85 < EP12 / (T12 + T23) ≤ 3.35. By controlling the ratio of the distance between the first spacer element and the second spacer element to the sum of the air gaps between the first lens and the third lens, sufficient space is provided for the light rays before and after the second lens, avoiding excessive squeezing of the optical path space, providing a flexible adjustment space for the power distribution and surface curvature design of the first lens, the second lens, and the third lens, ensuring that the three lenses can fully exert their collaborative correction capabilities for spherical aberration and coma, and guaranteeing the imaging quality of the optical system.
[0053] In some embodiments of the present application, the combined focal length f12 of the first lens and the second lens, the inner diameter d1s of the object side surface of the first spacer element, and the inner diameter d2s of the object side surface of the second spacer element satisfy the conditional expression 2.05 < f12 / (d1s + d2s) ≤ 2.45. By restricting the ratio of the combined focal length of the first lens and the second lens to the sum of the inner diameters of the object side surfaces of the first two spacer elements, the optical capabilities of the front lens group are matched with the physical space, ensuring that the light rays passing through the first lens and the second lens can enter the subsequent lens group at appropriate angles and heights, providing good light incident conditions for the third lens and the fourth lens to fully exert their aberration correction capabilities, and thereby improving the overall imaging quality.
[0054] In some embodiments of the present application, the effective focal length f3 of the third lens and the effective focal length f2 of the second lens satisfy -1.25 < f3 / f2 < -0.85; the outer diameter D3s of the object side surface of the third spacer element and the outer diameter D2m of the image side surface of the second spacer element satisfy 0.95 < D3s / D2m < 1.25. By restricting the ratio of the effective focal length of the third lens to the effective focal length of the second lens, and the ratio of the outer diameter of the object side surface of the third spacer element to the outer diameter of the image side surface of the second spacer element, while ensuring that the second lens and the third lens improve aberrations, it is ensured that the sizes of the second lens and the third lens match the support range of the spacer elements, avoiding stray light interference caused by the spacer elements being unable to cover the light-transmitting regions of the lenses.
[0055] In some embodiments of the present application, the effective focal length f4 of the fourth lens and the effective focal length f3 of the third lens satisfy: -8.00 < f4 / f3 < -3.65; the maximum outer diameter OD4 of the fourth lens and the maximum outer diameter OD3 of the third lens satisfy: 1.10 < OD4 / OD3 ≤ 1.25. As the core aberration correction lenses of the lens, through the dual constraints of the ratio of f4 to f3 and the ratio of OD4 to OD3, it is beneficial for the optical system to achieve efficient field curvature and chromatic aberration correction while avoiding the reduction of imaging quality consistency caused by light path offset, thereby ensuring a clear and stable optical performance in the core imaging area.
[0056] In some embodiments of the present application, the outer diameter D02s of the object-side end face of the second barrel, the maximum outer diameter OD1 of the first lens, and the effective radius DT11 of the first lens satisfy the conditional expression 2.15 < D02s / (OD1 - DT11×2) < 3.05. By constraining the ratio of D02s to the radial dimension (OD1 - DT11×2) of the non-light-transmitting area of the first lens, the bearing structure of the object-side end face of the second barrel is adapted to the non-light-transmitting area of the first lens, so as to ensure the stable support of the barrel for the first lens while providing a smooth propagation channel for the effective imaging light to ensure the light transmission efficiency, and at the same time, the bearing structure can absorb the assembly stress and thermal expansion deformation, avoid cracks or optical surface deformation of the lens caused by extrusion, and use the barrel wall to effectively intercept the stray light reflected by the edge of the first lens to improve the imaging purity.
[0057] In some embodiments of the present application, the axial spacing distance EP23 between the second spacer and the third spacer, and the distance ED3 along the optical axis between the vertex of the effective radius of the image side of the third lens and the vertex of the effective radius of the object side of the fourth lens satisfy the conditional expression 1.95 < EP23 / ED3 < 3.05. Since the image side of the third lens is in close contact with the second spacer, EP23 is similar to the maximum thickness of the non-light-transmitting area of the third lens. By constraining the thickness through the above conditional expression, it is possible to avoid the interference between the non-light-transmitting area of the third lens being too thick and the object side of the fourth lens, thereby ensuring the assembly rationality and structural stability of the optical system.
[0058] In some embodiments of the present application, the air gap T45 between the fourth lens and the fifth lens on the optical axis and the maximum thickness CP4 of the fourth spacer along the optical axis satisfy the conditional expression 1.75 < T45 / CP4 < 2.10. By constraining the ratio of T45 and CP4, this conditional expression makes the fourth spacer have a reasonable thickness, thereby reducing the risk of attitude deviation of the fourth lens during assembly or use, avoiding interference with the imaging light path due to abnormal lens position, and further improving the imaging clarity within the full field of view.
[0059] The following description, with reference to the accompanying drawings, further illustrates examples of specific surface shapes and parameters of optical imaging lenses applicable to the above embodiments.
[0060] It should be noted that in the following Embodiment 1, there are three examples: Embodiment 1-1, Embodiment 1-2, and Embodiment 1-3; in Embodiment 2, there are three examples: Embodiment 2-1, Embodiment 2-2, and Embodiment 2-3; and in Embodiment 3, there are three examples: Embodiment 3-1, Embodiment 3-2, and Embodiment 3-3. In the three examples within the same embodiment, the optical lenses have the same optical parameters, that is, the basic optical parameter table and the aspherical higher-order coefficient table are the same. However, the structural parameters are different, that is, the dimensional values of some structural parameters of the lens barrel, multiple spacer elements, and lens groups in the optical imaging lens are different.
[0061] It should be noted that any one of the examples in Embodiments 1 to 3 described below is applicable to all implementations of this application.
[0062] Example 1 like Figures 7 to 11 As shown, the optical imaging lens of Embodiment 1 is described. Figure 7 A schematic diagram of the optical imaging lens of Embodiment 1-1 is shown. Figure 8 The diagram shows the structure of the optical imaging lens in Embodiments 1-2. Figure 9 Schematic diagrams of the optical imaging lenses of Embodiments 1-3 are shown. The contact methods of the spacer elements in Embodiments 1-2 and 1-3 are the same as those in Embodiment 1-1. Please refer to the relevant description of the optical imaging lens of Embodiment 1-1, which will not be repeated here.
[0063] like Figure 7 As shown, the optical imaging lens of Embodiment 1-1 includes a first lens barrel P01 and a second lens barrel P02. The second lens barrel has a stepped surface near the object side, and the first and second lens barrels are supported by the stepped surface. An autofocus assembly T is provided inside the first lens barrel P01. The autofocus assembly T includes a light-transmitting substrate, a liquid material, and a flexible film in sequence along the optical axis from the object side to the image side, forming a corresponding structure. Figure 7 The diagram shows a first surface S1, a second surface S2, a third surface S3, and a fourth surface S4, with the third surface S3 and the fourth surface S4 being surfaces with variable curvature. A liquid material is connected to a conductive material. When an external voltage is applied to the conductive material, the volume of the liquid material changes, causing deformation of its image-side surface. This deformation, in turn, causes deformation of the flexible thin film, thereby changing the focal length of the autofocus assembly and adjusting the total effective focal length of the optical imaging lens.
[0064] Within the second lens barrel P02, a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fourth auxiliary spacer P4b, and a fifth lens E5 are arranged sequentially along the optical axis from the object side to the image side. S5 and S6 are the object-side and image-side surfaces of the first lens E1, respectively; S7 and S8 are the object-side and image-side surfaces of the second lens E2, respectively; S9 and S10 are the object-side and image-side surfaces of the third lens E3, respectively; S11 and S12 are the object-side and image-side surfaces of the fourth lens E4, respectively; and S13 and S14 are the object-side and image-side surfaces of the fifth lens E5, respectively.
[0065] The first spacer element P1 is placed on the image side of the first lens E1, and the first spacer element P1 is in contact with the image side surface S6 of the first lens. The second spacer element P2 is placed on the image side of the second lens E2, and the second spacer element P2 is in contact with the image side surface S8 of the second lens. The third spacer element P3 is placed on the image side of the third lens E3, and the third spacer element P3 is in contact with the image side surface S10 of the third lens. The fourth spacer element P4 is placed on the image side of the fourth lens E4, and the fourth spacer element P4 is in contact with the image side surface S12 of the fourth lens. The fourth auxiliary spacer element P4b is placed on the image side of the fourth lens E4 and is in contact with the image side surface of the fourth spacer element P4.
[0066] Table 1 below shows the basic optical parameters of the optical imaging lens of Embodiment 1 under Embodiments 1-1, 1-2, and 1-3, where the units for radius of curvature and center thickness / gap are millimeters (mm). In Table 1, OBJ (not shown in the figure) is the object plane, STO is the aperture, and the aperture is located on the object side of the first lens E1. S15 and S16 are the object side and image side of the filter or protective glass, respectively, and S17 is the imaging plane.
[0067] Table 1
[0068] As shown in Table 1, in Embodiment 1, the object-side and image-side surfaces of the first lens E1 to the fifth lens E5 are all aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the following aspherical formula: Formula (1) Where x is the distance vector from the vertex of the aspherical surface along the optical axis at a height of h; c is the paraxial curvature of the aspherical surface, c=1 / R, that is, the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above; k is the conic coefficient. These are the correction coefficients of the i-th order for aspherical surfaces. Tables 2-1 and 2-2 below give the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A24, A26, A28, and A30 that can be used for each aspherical mirror S5-S14 in Example 1.
[0069] Table 2-1
[0070] Table 2-2
[0071] In Embodiment 1, the first lens E1 has positive optical power, the second lens E2 has negative optical power, the third lens E3 has positive optical power, the fourth lens E4 has negative optical power, and the fifth lens E5 has negative optical power. The optical parameters of the optical imaging lens in Embodiment 1 under Embodiments 1-1, 1-2, and 1-3 are shown in Table 7 below, and the structural parameters are shown in Table 8 below (unit: mm). The values of each conditional expression are shown in Table 9 below. The radius of curvature parameters of the optical imaging lens under different object distance conditions (radius of curvature RT1 of S3 and radius of curvature RT2 of S4) are shown in Table 10 below. It should be noted that the object distance corresponding to the effective focal length f of the optical imaging lens in Table 7 is 550 mm.
[0072] Figure 10 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 1 at an object distance of 550 mm is shown, which indicates the deflection of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 11 The astigmatism curve of the optical imaging lens of Embodiment 1 at an object distance of 550 mm is shown, representing the curvature of the meridional and sagittal image planes. Figure 10 and Figure 11 As can be seen, the on-axis chromatic aberration and astigmatism are well controlled, and the optical imaging lens given in Example 1 can achieve good imaging quality.
[0073] Example 2 like Figures 12 to 16 As shown, the optical imaging lens of Embodiment 2 is described. Figure 12 A schematic diagram of the optical imaging lens of Embodiment 2-1 is shown. Figure 13 A schematic diagram of the optical imaging lens of Embodiment 2-2 is shown. Figure 14 A schematic diagram of the optical imaging lens of Embodiments 2-3 is shown. The contact method of each spacer element in Embodiments 2-2 and 2-3 is the same as that in Embodiment 2-1. Please refer to the relevant description of the optical imaging lens of Embodiment 2-1, which will not be repeated here.
[0074] like Figure 12 As shown, the optical imaging lens of Embodiment 2-1 includes a first lens barrel P01 and a second lens barrel P02. The second lens barrel has a stepped surface near the object side, and the first and second lens barrels are supported by the stepped surface. An autofocus assembly T is provided inside the first lens barrel P01. This autofocus assembly T includes a light-transmitting substrate, a liquid material, and a flexible thin film sequentially along the optical axis from the object side to the image side, forming corresponding... Figure 12 The first surface S1, the second surface S2, the third surface S3, and the fourth surface S4 are shown, and the third surface S3 and the fourth surface S4 are surfaces with variable curvature.
[0075] Within the second lens barrel P02, a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fourth auxiliary spacer P4b, and a fifth lens E5 are arranged sequentially along the optical axis from the object side to the image side. S5 and S6 are the object-side and image-side surfaces of the first lens E1, respectively; S7 and S8 are the object-side and image-side surfaces of the second lens E2, respectively; S9 and S10 are the object-side and image-side surfaces of the third lens E3, respectively; S11 and S12 are the object-side and image-side surfaces of the fourth lens E4, respectively; and S13 and S14 are the object-side and image-side surfaces of the fifth lens E5, respectively.
[0076] The first spacer element P1 is placed on the image side of the first lens E1, and the first spacer element P1 is in contact with the image side surface S6 of the first lens. The second spacer element P2 is placed on the image side of the second lens E2, and the second spacer element P2 is in contact with the image side surface S8 of the second lens. The third spacer element P3 is placed on the image side of the third lens E3, and the third spacer element P3 is in contact with the image side surface S10 of the third lens. The fourth spacer element P4 is placed on the image side of the fourth lens E4, and the fourth spacer element P4 is in contact with the image side surface S12 of the fourth lens. The fourth auxiliary spacer element P4b is placed on the image side of the fourth lens E4 and is in contact with the image side surface of the fourth spacer element P4.
[0077] Table 3 below shows the basic optical parameters of the optical imaging lens of Embodiment 2 under Embodiments 2-1, 2-2, and 2-3. The units for radius of curvature and center thickness / gap are millimeters (mm). In Table 3, OBJ (not shown in the figure) is the object plane, STO is the aperture, and the aperture is located on the object side of the first lens E1. S15 and S16 are the object-side and image-side surfaces of the filter or protective glass, respectively, and S17 is the imaging plane.
[0078] Table 3
[0079] As shown in Table 3, in Embodiment 2, the object-side and image-side surfaces of the first lens E1 to the fifth lens E5 are aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the aforementioned aspherical formula (1). Tables 4-1 and 4-2 below give the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each aspherical mirror S5-S14 in Embodiment 2.
[0080] Table 4-1
[0081] Table 4-2
[0082] In Embodiment 2, the first lens E1 has positive optical power, the second lens E2 has negative optical power, the third lens E3 has positive optical power, the fourth lens E4 has negative optical power, and the fifth lens E5 has negative optical power. The optical parameters of the optical imaging lens in Embodiment 2 under Embodiments 2-1, 2-2, and 2-3 are shown in Table 7 below, and the structural parameters are shown in Table 8 below (unit: mm). The values of each conditional expression are shown in Table 9 below. The radius of curvature parameters of the optical imaging lens under different object distance conditions (radius of curvature RT1 of S3 and radius of curvature RT2 of S4) are shown in Table 10 below. It should be noted that the object distance corresponding to the effective focal length f of the optical imaging lens in Table 7 is 550 mm.
[0083] Figure 15 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 2 at an object distance of 550 mm is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 16 The astigmatism curve of the optical imaging lens of Embodiment 2 at an object distance of 550 mm is shown, representing the curvature of the meridional and sagittal image planes. Figure 15 and Figure 16 As can be seen, the on-axis chromatic aberration and astigmatism are well controlled, and the optical imaging lens given in Example 2 can achieve good imaging quality.
[0084] Example 3 like Figures 17 to 21 As shown, the optical imaging lens of Embodiment 3 is described. Figure 17 A partial structural schematic diagram of the optical imaging lens of Embodiment 3-1 is shown. Figure 18 A partial structural schematic diagram of the optical imaging lens of Embodiment 3-2 is shown. Figure 19A partial structural schematic diagram of the optical imaging lens of Embodiment 3-3 is shown. The contact method of each spacer element in Embodiments 3-2 and 3-3 is the same as that in Embodiment 3-1. Please refer to the relevant description of the optical imaging lens of Embodiment 3-1, which will not be repeated here.
[0085] like Figure 17 As shown, the optical imaging lens of Embodiment 3-1 includes a first lens barrel P01 and a second lens barrel P02, and the second lens barrel has a stepped surface near the object side, and the first lens barrel and the second lens barrel are supported by the stepped surface. An autofocus assembly T is provided inside the first lens barrel P01. This autofocus assembly T includes, along the optical axis from the object side to the image side, a light-transmitting substrate, a liquid material, and a flexible thin film, correspondingly forming... Figure 17 The first surface S1, the second surface S2, the third surface S3, and the fourth surface S4 are shown, and the third surface S3 and the fourth surface S4 are surfaces with variable curvature.
[0086] Within the second lens barrel P02, a first lens E1, a first spacer P1, a second lens E2, a second spacer P2, a third lens E3, a third spacer P3, a fourth lens E4, a fourth spacer P4, a fourth auxiliary spacer P4b, and a fifth lens E5 are arranged sequentially along the optical axis from the object side to the image side. S5 and S6 are the object-side and image-side surfaces of the first lens E1, respectively; S7 and S8 are the object-side and image-side surfaces of the second lens E2, respectively; S9 and S10 are the object-side and image-side surfaces of the third lens E3, respectively; S11 and S12 are the object-side and image-side surfaces of the fourth lens E4, respectively; and S13 and S14 are the object-side and image-side surfaces of the fifth lens E5, respectively.
[0087] The first spacer element P1 is placed on the image side of the first lens E1, and the first spacer element P1 is in contact with the image side surface S6 of the first lens. The second spacer element P2 is placed on the image side of the second lens E2, and the second spacer element P2 is in contact with the image side surface S8 of the second lens. The third spacer element P3 is placed on the image side of the third lens E3, and the third spacer element P3 is in contact with the image side surface S10 of the third lens. The fourth spacer element P4 is placed on the image side of the fourth lens E4, and the fourth spacer element P4 is in contact with the image side surface S12 of the fourth lens. The fourth auxiliary spacer element P4b is placed on the image side of the fourth lens E4 and is in contact with the image side surface of the fourth spacer element P4.
[0088] Table 5 below shows the basic optical parameters of the optical imaging lens of Embodiment 3 under Embodiments 3-1, 3-2, and 3-3. The units for radius of curvature and center thickness / gap are millimeters (mm). In Table 5, OBJ (not shown in the figure) is the object plane, STO is the aperture, and the aperture is located on the object side of the first lens E1. S15 and S16 are the object-side and image-side surfaces of the filter or protective glass, respectively, and S17 is the imaging plane.
[0089] Table 5
[0090] As shown in Table 5, in Embodiment 3, the object-side and image-side surfaces of the first lens E1 to the fifth lens E5 are all aspherical. The surface shape of each aspherical lens can be defined using, but is not limited to, the aforementioned aspherical formula (1). Tables 6-1 and 6-2 below give the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each aspherical mirror S5-S14 in Embodiment 3.
[0091] Table 6-1
[0092] Table 6-2
[0093] In Embodiment 3, the first lens E1 has positive optical power, the second lens E2 has negative optical power, the third lens E3 has positive optical power, the fourth lens E4 has negative optical power, and the fifth lens E5 has negative optical power. The optical parameters of the optical imaging lens in Embodiment 3 under Embodiments 3-1, 3-2, and 3-3 are shown in Table 7 below, and the structural parameters are shown in Table 8 below (unit: mm). The values of each conditional expression are shown in Table 9 below. The radius of curvature parameters of the optical imaging lens under different object distance conditions (radius of curvature RT1 of S3 and radius of curvature RT2 of S4) are shown in Table 10 below. It should be noted that the object distance corresponding to the effective focal length f of the optical imaging lens in Table 7 is 550 mm.
[0094] Figure 20 The on-axis chromatic aberration curve of the optical imaging lens of Embodiment 3 at an object distance of 550 mm is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the optical imaging lens. Figure 21 The astigmatism curve of the optical imaging lens of Embodiment 3 at an object distance of 550 mm is shown, representing the curvature of the meridional and sagittal image planes. Figure 20 and Figure 21 As can be seen, the on-axis chromatic aberration and astigmatism are well controlled, and the optical imaging lens given in Example 3 can achieve good imaging quality.
[0095] Table 7
[0096] Table 8
[0097] Table 9
[0098] Table 10
[0099] It should be understood that the structure or architecture described above is merely exemplary, and the implementation methods and entities of this application are not limited thereto, but can be modified without departing from the spirit of this application. It is understood that the descriptions of the various embodiments in this application emphasize the differences between the various embodiments, while their similarities or corresponding parts can be referred to mutually. For the sake of brevity, this application will not elaborate on each one.
[0100] While numerous embodiments of this application have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will arise for those skilled in the art without departing from the spirit and intent of this application. It should be understood that various alternatives to the embodiments of this application described herein may be employed in the practice of this application. The appended claims are intended to define the scope of protection of this application and therefore cover equivalents or alternatives within the scope of these claims.
Claims
1. An optical imaging lens, characterized in that, It includes a second lens barrel and a lens group and multiple spacer elements disposed in the second lens barrel; The lens group comprises, in sequence from the object side to the image side along the optical axis of the optical imaging lens: a first lens with positive optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with negative optical power, and a fifth lens with negative optical power. The air gap between the fourth lens and the fifth lens on the optical axis is greater than the sum of the air gaps on the optical axis of the other adjacent lenses in the lens group; The plurality of spacers includes a first spacer, a second spacer, a third spacer, and a fourth spacer; the first spacer is positioned on the image side of the first lens and contacts the image side of the first lens; the second spacer is positioned on the image side of the second lens and contacts the image side of the second lens; the third spacer is positioned on the image side of the third lens and contacts the image side of the third lens; the fourth spacer is positioned on the image side of the fourth lens and contacts the image side of the fourth lens. The inner diameter d02m of the image-side end face of the second lens barrel and the entrance pupil diameter EPD of the optical imaging lens satisfy the following condition: 2.85 <d02m / EPD≤3.20; The combined focal length f34 of the third lens and the fourth lens, and the air gap T34 between the third lens and the fourth lens on the optical axis satisfying: 56.65 <f34 / T34<65.45; The spacing between the first spacer element and the second spacer element along the optical axis, EP12, the spacing between the second spacer element and the third spacer element along the optical axis, EP23, and the spacing between the third spacer element and the fourth spacer element along the optical axis, EP34, satisfy the following condition: 1.45 < (EP12 + EP23) / EP34 < 2.
00.
2. The optical imaging lens according to claim 1, characterized in that, It also includes a first lens barrel disposed on the first lens object side and an autofocus assembly disposed therein, the autofocus assembly having a variable curvature surface; The second lens barrel has a stepped surface at the far-axis position of the object side end, and the first lens barrel and the second lens barrel are supported by the stepped surface.
3. The optical imaging lens according to claim 2, characterized in that, The image side of the second spacer element contacts the object side of the third lens; The outer diameter D2m of the image-side surface of the second spacer element and the inner diameter d2m of the image-side surface of the second spacer element satisfy the following condition: 2.15 <D2m / d2m<2.60; The outer diameter D3s of the side surface of the third spacer element and the inner diameter d3s of the side surface of the third spacer element satisfy the following condition: 1.95≤D3s / d3s<2.
45.
4. The optical imaging lens according to claim 2, characterized in that, The maximum height L2 of the second lens barrel, and the air gap T45 between the fourth and fifth lenses on the optical axis, satisfy: 3.35 <L2 / T45≤4.5。 5. The optical imaging lens according to claim 4, characterized in that, The effective focal length f1 of the first lens, the effective focal length f2 of the second lens, and the effective focal length f of the optical imaging lens satisfy the following condition: 1.45 < (f1 + |f2|) / f < 1.70; The maximum height L2 of the second lens barrel, the distance EP01 between the object-side end face of the second lens barrel and the object-side side face of the first spacer element along the optical axis, and the distance EP12 between the first spacer element and the second spacer element along the optical axis satisfy the following condition: 2.60 <L2 / (EP01+EP12)<3.70。 6. The optical imaging lens according to claim 1 or 2, characterized in that, The air gap T45 between the fourth and fifth lenses on the optical axis, and the air gap T34 between the third and fourth lenses on the optical axis, satisfy the following condition: 10.
05. <T45 / T34≤13.65; The distance EP34 between the third and fourth spacer elements along the optical axis, and the distance EP23 between the second and third spacer elements along the optical axis, satisfy the following condition: 1.
40. <EP34 / EP23<2.10。 7. The optical imaging lens according to claim 2, characterized in that, The distance EP12 between the first spacer element and the second spacer element along the optical axis, the air gap T12 between the first lens and the second lens on the optical axis, and the air gap T23 between the second lens and the third lens on the optical axis satisfy the following condition: 1.85 <EP12 / (T12+T23)≤3.35。 8. The optical imaging lens according to claim 2, characterized in that, The combined focal length f12 of the first lens and the second lens, the inner diameter d1s of the side surface of the first spacer element, and the inner diameter d2s of the side surface of the second spacer element satisfy the following condition: 2.05 <f12 / (d1s+d2s)≤2.45。 9. The optical imaging lens according to claim 3, characterized in that, The effective focal length f3 of the third lens and the effective focal length f2 of the second lens satisfy the following condition: -1.25 <f3 / f2<-0.85; The outer diameter D3s of the third spacer element on the object side and the outer diameter D2m of the second spacer element on the image side satisfy the following condition: 0.95 <D3s / D2m<1.25。 10. The optical imaging lens according to claim 2, characterized in that, The effective focal length f4 of the fourth lens and the effective focal length f3 of the third lens satisfy the following condition: -8.00 <f4 / f3<-3.65; The maximum outer diameter OD4 of the fourth lens and the maximum outer diameter OD3 of the third lens satisfy the following condition: 1.10 <OD4 / OD3≤1.25。 11. The optical imaging lens according to claim 2, characterized in that, The outer diameter D02s of the object-side end face of the second lens barrel, the maximum outer diameter OD1 of the first lens, and the effective radius DT11 of the first lens satisfy the following condition: 2.15 <D02s / (OD1-DT11×2)<3.05。 12. The optical imaging lens according to claim 3, characterized in that, The distance EP23 between the second and third spacer elements along the optical axis, and the distance ED3 between the vertex of the effective radius of the image side of the third lens and the vertex of the effective radius of the object side of the fourth lens along the optical axis, satisfy the following condition: 1.95 <EP23 / ED3<3.05。 13. The optical imaging lens according to claim 1 or 2, characterized in that, The air gap T45 between the fourth lens and the fifth lens on the optical axis, and the maximum thickness CP4 of the fourth spacer element along the optical axis, satisfy: 1.75 <T45 / CP4<2.10。